The present invention is directed to a data cartridge library that is useful in storing data on a recording medium located in a cartridge and/or retrieving data from a recording medium located in a cartridge.
Presently, data cartridge libraries are primarily used to archive data, i.e., store data that is not immediately needed by a host computer, and provide archived data to the host computer when the data is needed. To elaborate, the typical data cartridge library receives data from a host computer and causes the data to be stored or recorded on the recording medium located in one or more cartridges. When the host computer requires some of the data that was previously stored in a data cartridge, a request for the data is sent from the host computer to the library. In response, the library identifies the data cartridge(s) in which the desired data is located, retrieves the data from the recording medium with the cartridge(s), and transmits the retrieved data to the host computer system.
Presently, most data cartridge libraries are comprised of: (a) a frame/chassis/cabinet that defines an interior space; (b) a magazine structure that is located within the interior space and that provides a plurality of data cartridge storage spaces, which are each capable of accommodating at least one data cartridge; (c) one or more drives that are each located within the interior space and capable of writing data onto a recording medium located in a data cartridge and/or reading data from the recording medium located in a data cartridge; (d) a data cartridge transport device that is located within the interior space and capable of moving an individual data cartridge between any one of the plurality of data cartridge storage spaces and any one of the drives within the library; and (e) an interface for receiving data from and transmitting data to a host computer.
Typically, such a data cartridge library is capable of both storing data provided by a host computer and retrieving data previously stored in the library for the host computer. The storage of data involves using the transport device to move a data cartridge from one of the data cartridge storage spaces to a drive, using the drive to write the data provided by the host computer on the recording medium located within the cartridge, and after the data has been written on the recording medium, using the transport device to move the data cartridge from the drive to a data cartridge storage space. The retrieval of data involves using the transport device to move a data cartridge from one of the data cartridge storage spaces to a drive, using the drive to read the data on the recording medium located within the cartridge and provide the read data to the host computer, and after the data has been read from the recording medium, using the transport device to move the data cartridge from the drive to a data cartridge storage space.
As previously noted, a data cartridge library is comprised of a data cartridge transport that is capable of being used to move a data cartridge between any one of the magazine data cartridge storage locations and any one of the drives in the library. Typically, the data cartridge transport device is comprised of a picker and an elevator that moves the picker within the interior space. The picker is capable of inserting/extracting a data cartridge into/from any one of the magazine storage spaces and any one of the drives. Typically, the picker is comprised of: (a) a grasping device that is used to engage a data cartridge and (b) a pusher plate that carries the grasping device and that is capable of movement towards and away from a location that is capable of accommodating a data cartridge. The elevator serves to position the picker adjacent to a location that is capable of accommodating a data cartridge so that the picker can perform an insertion or extraction operation.
In an extraction operation, the elevator is used to position the picker adjacent to a space at which a data cartridge is located (typically, either a storage space associated with the magazine or a drive). After the picker has been positioned, the pusher plate is used to move the grasping device towards the data cartridge. After the grasping device has been positioned, the grasping device is then actuated to grasp the cartridge. At this point, the pusher plate is then moved away from the location at which the data cartridge was located to extract the data cartridge from the space.
In an insertion operation, the elevator is used to position the picker (which is assumed to be grasping a data cartridge) adjacent to the space at which a data cartridge is to be located. After the picker has been positioned, the pusher plate is then used to move the grasping device and the grasped data cartridge towards the space in which the data cartridge is to be located. After the pusher plate and grasping device have positioned the data cartridge in the space, the grasping device releases the data cartridge, and the pusher plate is moved away from the space to retract the grasping device.
Many data cartridge libraries are also comprised of an entry/exit port that allows a user to insert and/or extract a data cartridge from the library without powering down the transport device. To elaborate, absent an entry/exit port, if a user wants to insert/extract a data cartridge into/from a library, the user typically powers down the transport device to avoid being injured by the transport device during the insertion or extraction of the data cartridge. The entry/exit port allows a user to insert/extract a data cartridge into/from the library without being exposed to the transport device. As a consequence, the entry/exit port allows a data cartridge to be inserted/extracted into/from the library without having to power down the transport device. Typically, an entry exit port is comprised of a slot structure that defines at least one slot that is capable of accommodating at least one data cartridge and a device that places the structure in one of two states. In the first state, the device positions the slot structure such that a slot is exposed to the exterior environment. When the structure is in this state, a user can either insert a data cartridge into the slot or remove a data cartridge from the slot, without being exposed to the transport device in either case. In the second state, the device positions the slot structure such that a slot is exposed to the interior of the library and accessible by the transport device, which can either insert a cartridge into the slot or remove a cartridge from the slot. When the structure is in the second state, the user is not exposed to the transport device.
One type of entry/exit port that has evolved is comprised of: (a) a frame or support to/from which a magazine that can accommodate multiple data cartridges can be attached/detached; and (b) a device for placing the frame in one of the states. In the first state, the device positions the frame such that the frame is exposed to the exterior environment. When the structure is in this state, a user can either attach a magazine to the frame or detach a magazine from the frame. Further, the user can either insert/remove one or more data cartridges into/from the magazine. In the second state, the device positions the frame such that any magazine that is attached to the frame is exposed to the transport device. In this state, the transport device can load data cartridges into the magazine or remove data cartridges from the magazine, as needed. When the frame is in either state, a user is substantially shielded from the transport device.
Many data cartridge libraries also have a hinged door that allows a user access to the interior of the library. Typically, such a door is provided so that the transport device can be accessed for maintenance and repair.
The present invention is directed to a data cartridge library that is comprised of: (a) a frame/chassis/cabinet; (b) a data cartridge magazine that provides a plurality of data cartridge storage spaces that are each capable of accommodating at least one data cartridge; (c) a drive that is capable of writing data onto a recording medium located within a cartridge and/or reading data from a recording medium located in a cartridge; (d) a picker that is capable of being used to insert and extract a data cartridge from a space that is capable of accommodating a data cartridge; and (e) an elevator for moving the picker within the library so that a data cartridge can be transported between any one of the plurality of magazine data cartridge storage spaces and any one of the drives within the library.
In one embodiment, the data cartridge library comprises a picker that is comprised of: (a) a base plate that is operatively connected to an elevator; (b) a grasper that is operatively connected to the base plate and comprised of a pair of members that are capable of being placed in a closed position that is suitable for grasping a data cartridge and an open position that is suitable for releasing a grasped data cartridge; and (c) a crank that is operatively connected to the base plate and capable of rotating about an axis. The picker further comprises a grasper cam structure comprised of a cam driver that is associated with the crank and a cam follower that is associated with the grasper. The cam driver and the cam follower are situated such that rotation of the crank brings the cam driver into contact with the cam follower and, in so doing, places the grasper in one of the closed position and the open position. Unlike known pickers that employ a crank and a cam structure to actuate a grasper, the grasper is placed in a closed position over a first range of rotation of the crank and an open position over a second range of rotation of the crank that substantially does not overlap with the first range of rotation. In one embodiment, the first and second ranges are each about 180 degrees.
In one embodiment, the data cartridge library comprises a picker that is comprised of: (a) a base plate that is operatively connected to an elevator; (b) a grasper that is operatively connected to the base plate and comprised of a pair of members that are capable of being placed in a closed position that is suitable for grasping a data cartridge and an open position that is suitable for releasing a grasped data cartridge; and (c) a crank that is operatively connected to the base plate and capable of rotating about an axis. The picker further comprises a grasper cam structure comprised of a cam driver that is associated with the crank and a cam follower that is associated with the grasper. The cam driver and the cam follower are situated such that rotation of the crank brings the cam driver into contact with the cam follower and, in so doing, places the grasper in one of the closed position and the open position. Unlike known pickers that employ a crank and a cam structure to actuate a grasper, the crank is capable of rotating through more than 180 degrees.
In one embodiment, the crank is capable of rotating through 360 degrees. In a particular embodiment in which the crank is capable of such a rotation, the picker is further comprised of a pusher plate that supports the grasper and a pusher plate cam structure that is used to move the pusher plate towards and away from a space that is capable of accommodating a data cartridge. The pusher plate cam structure is comprised of a pusher plate cam driver that is associated with the crank and a pusher plate cam follower that is associated with the pusher plate. The grasper cam structure and pusher cam structure are situated such that: (a) for 180 degrees of a 360 degree rotation of the crank, the grasper is placed in a closed position and the pusher plate can be moved between a fully retracted and a fully extended position; and (b) for the other 180 degrees of a 360 degree rotation of the crank, the grasper is placed in an open position and the pusher plate can be moved between a fully retracted position and a fully extended position.
In another embodiment, the data cartridge library is comprised of a picker that is, in turn, comprised of a base plate, grasper, crank that is capable of rotation about an axis, and a grasper cam structure. The grasper cam structure is comprised of a cam driver that is associated with the crank and a cam follower that is associated with the grasper. The grasper cam driver has a surface vector that is not substantially perpendicular to the axis or rotation of the crank. In one embodiment, the grasper cam driver comprises a bubble-like or spherical section that has such a surface vector. In a further embodiment, the picker is comprised of a pusher plate and a pusher plate cam structure with a pusher plate cam driver that is associated with the crank. The pusher plate cam driver has a surface vector, in contrast to the grasper cam driver, that is substantially perpendicular to the axis of rotation of the crank. In one particular embodiment, the pusher plate cam structure operates to move the pusher plate in a direction that is substantially perpendicular to the axis of rotation of the crank and the grasper cam structure operates such that the grasper cam follower is displaced in a direction that at least has a component vector that is parallel to the axis of rotation of the crank.
In another embodiment, a data cartridge library is provided that allows a user to readily remove/insert a transport module from/into the library, where the transport module is comprised of a picker and a substantial portion of an elevator. In one embodiment, the library is comprised of: (a) a frame/chassis/cabinet; (b) a data cartridge magazine; (c) a drive; (d) a picker that is capable of being used to insert and extract a data cartridge from a space that is capable of accommodating a data cartridge; and (e) an elevator for moving the picker within the library so that a data cartridge can be transported between any one of the plurality of magazine data cartridge storage spaces and any one of the drives within the library. The library is further comprised of a transport module that is comprised of a support structure, a portion of the elevator that is connected to the support structure, and the picker. A user-actuatable connector is also provided that allows a user to attach the transport module to the frame of the library and to detach the transport module from the frame so that the module can be removed from the library.
In one embodiment of a data cartridge library with a removable/insertable transport module, the elevator is comprised of an elevator carriage that supports the picker, a first drive system for driving one end of the carriage, a second drive system for driving the other end of the carriage, an electric motor that is operatively connected to the first drive system and provides the first drive system with energy for moving the first end of the carriage. The elevator is further comprised of a shaft that connects the first drive system to the second drive system, thereby allowing energy from the motor to be transferred through the first drive system to the second drive system. So that the transport module can be removed from the library, the shaft is capable of be separated into two pieces by actuation of a user-actuatable connector. In one embodiment, the connector is comprised of a spline associated with a free end of one piece of the shaft and a spline collar that is associated with the free end of the other piece of the shaft. By sliding the spline collar away from the spline, the two pieces of the shaft are disconnected to facilitate removal of the transport module from the library. To connect the two pieces of the shaft, the free ends of the shaft are aligned and the spline collar is slide over the spline.
In yet another embodiment, a data cartridge library is provided in which a shaft, rather than a pulley system, is used to connect two drive structures that are used to drive the ends of an elevator carriage that supports a picker. In one embodiment, the library is comprised of: (a) a frame/chassis/cabinet; (b) a data cartridge magazine; (c) a drive; (d) a picker that is capable of being used to insert and extract a data cartridge from a space that is capable of accommodating a data cartridge; and (e) an elevator for moving the picker within the library so that a data cartridge can be transported between any one of the plurality of magazine data cartridge storage spaces and any one of the drives within the library. The elevator is comprised of an elevator carriage that supports the picker, a first drive system for driving one end of the carriage, a second drive system for driving the other end of the carriage, an electric motor that is operatively connected to the first drive system and provides the first drive system with energy for moving the first end of the carriage. The elevator is further comprised of a shaft that connects the first drive system to the second drive system, thereby allowing energy from the motor to be transferred through the first drive system to the second drive system.
In yet another embodiment, a data cartridge library is provided with a door that allows a user access to the interior of the library and that is not constrained to rotate about an axis when moving between open and closed positions. In one embodiment, the library is comprised of: (a) a frame/chassis/cabinet with a top surface, bottom surface, and side surface extending between the top and bottom surfaces; (b) a data cartridge magazine; (c) a drive; (d) a picker that is capable of being used to insert and extract a data cartridge from a space that is capable of accommodating a data cartridge; and (e) an elevator for moving the picker within the library so that a data cartridge can be transported between any one of the plurality of magazine data cartridge storage spaces and any one of the drives within the library. The library is further comprised of a user interface that is associated with the side surface of the frame and is exposed to the exterior environment. In various embodiments, the user-interface comprises an output terminal for providing a user with information relating to the library, an input terminal for allowing a user to interact with the library, an entry/exit port, and combinations of the these elements. The side surface is comprised of a displaceable portion that accommodates the user interface. The displaceable portion is capable of being placed in an “open” condition that allows a user access to the magazine, drive(s), picker and elevator and a “closed” condition that prevents user access to the noted elements. The library further comprises a user-actuatable connector that permits a user to place the displaceable portion in either the open or closed conditions. However, unlike hinged doors, the displaceable portion and the user-actuatable connector do not constrain the displaceable portion to rotate about an axis in moving between open and closed positions. In one embodiment, the user-actuatable connector comprises one or more captured screws that allow the displaceable portion to be detached from the frame to expose the interior of the library or attached to the frame to cover the interior of the library.
In another embodiment, a data cartridge library is provided that has a multi-piece magazine. In one embodiment, the library is comprised of: (a) a frame/chassis/cabinet; (b) a data cartridge magazine; (c) a drive; (d) a picker that is capable of being used to insert and extract a data cartridge from a space that is capable of accommodating a data cartridge; and (e) an elevator for moving the picker within the library so that a data cartridge can be transported between any one of the plurality of magazine data cartridge storage spaces and any one of the drives within the library. In one embodiment, the magazine is a multi-piece structure that forms a channel with a first side, a second side, and a back side that extends between the first and second sides. The first, second and back sides cooperatively define an interior space that is capable of accommodating a plurality of data cartridges. The multi-piece magazine structure is comprised of: (a) a first structure that is in the form of a U-shaped channel that forms portions of the first and second sides of the magazine and the back side of the magazine; (b) a second structure that forms portions of the first and second sides; and (c) a coupler for connecting the first and structures to one another. The first structure also serves as a portion of the frame of the library and, in one embodiment, is made of metal. The second structure is made of the same type of material as the cartridges (typically, plastic) in one embodiment.
The present invention further provides a multi-piece magazine that is suitable for use in a data cartridge library. In one embodiment, the magazine resulting for the joining together of the various pieces forms a channel with a first side, a second side, and a back side that extends between the first and second sides. The first side, second side and back side cooperatively define an interior space that is capable of accommodating a plurality of data cartridges. The multi-piece magazine structure is comprised of: (a) a first structure that forms at least a portion of the back side of the magazine; (b) a second that structure that forms at least portions of the first and second sides; and (c) a coupler for connecting the first and second structures to one another. In one embodiment, the first structure is in the form of a U-shaped channel that forms portions of the first and second sides of the magazine and a substantial portion of the back side of the magazine. The second structure, in addition to providing at least portions of the first and second sides of the magazine, further comprises a pair of end sides that are separated from each other and that each connect the portions of the first and second sides provided by the second structure to one another, thereby forming a closed-loop structure. The coupler connects the first and second structures to one another so as to form a box-like, magazine structure with an open side through which cartridges can be inserted/removed into/from the magazine structure.
The present invention also provides a magazine that is capable of being attached/detached to/from an entry/exit port structure. The magazine is comprised of: (a) a box structure with a bottom wall and a side wall that extends from the bottom wall to a terminal edge that defines an opening for the insertion/extraction of data cartridges into/from the magazine; (b) a plurality of partitioning structures that partition the interior space of the magazine into a plurality of slots that are each capable of accommodating at least one data cartridge; and (c) a coupling structure that allows the box structure to be attached/detached to/from an entry/exit port structure. In one embodiment, the coupling structure is comprised of a first substantially rigid flange that extends away from a first side wall portion and a second substantially rigid flange that extends away from a second side wall portion that is separated from and substantially parallel to the first side wall portion. In one embodiment, the first and second flanges are located in an asymmetric manner so that the box structure can only be mounted to the entry/exit port structure in a particular orientation.
The present invention further provides a data cartridge library with an entry/exit port that has a frame that can be readily attached and detached to facilitate maintenance of the entry/exit port. In one embodiment, the library is comprised of: (a) a frame/chassis/cabinet; (b) a data cartridge magazine; (c) a drive; and (d) a transport assembly that is capable of moving a data cartridge between any one of the plurality of magazine data cartridge storage spaces and the drive. The library is further comprised of an entry/exit port for moving entry/exit port magazines between an exterior environment and an interior environment of the library where the magazine is accessible to the transport device. In one embodiment, the entry/exit port comprises a mount to which a magazine can be attached and from which a magazine can be detached, a guide structure for constraining the movement of the mount between a first position at which a user can attach/detach a magazine to/from the mount and a second position at which the transport assembly is capable of inserting/removing a data cartridge into/from a magazine attached to the mount, and a motive device for providing the motive force for moving the mount between the first and second positions. The entry/exit port further comprises a “stop” structure that is attached to the mount and operates to prevent the mount from being moved beyond the first position. A quick release structure allows the stop structure to be quickly detached from the mount so that the mount can be readily removed from the library.
The present invention also provides a data cartridge library with a drive bay that is capable of accommodating a full-height drive and being altered to accommodate two, half-height drives. In one embodiment, the library is comprised of: (a) a frame/chassis/cabinet; (b) a data cartridge magazine; and (c) a transport assembly that is capable of moving a data cartridge between any one of the plurality of magazine data cartridge storage spaces and any one of the drives within the library. The library is further comprised of a drive bay that provides a full-height drive space that is capable of accommodating a full-height drive and a partition mount for supporting a partition that allows the full-height drive space to be divided into two, half-height drive spaces that are each capable of accommodating a half-height drive. In one embodiment, the full-height drive space is capable of: (a) accommodating a full-height drive that is located within a full-height drive sled; or (b) when a partition engages the partition mount, accommodating two, half-height drives that are each located within a half-height drive sled. In other embodiments, the library is further comprised of combinations of full-height and half-height drives located in the drive bay.
The present invention also provides a data cartridge library with a universal bay that is capable of accommodating one of more electronic devices that are not necessary to the operation of the library but can be used to enhance or supplement the operation of the library. In one embodiment, the library is comprised of a frame/chassis/cabinet that defines an interior space. The interior space is partitioned into: (a) a data cartridge space that provides storage locations for all of the cartridges that the library is capable of storing; (b) a drive space that provides locations for all of the drives that the library is capable of supporting; (c) a transport assembly space for accommodating the movement of a picker and elevator in moving a data cartridge between any one of the data cartridge storage locations and any one of the drives within the library; (d) a power supply space for housing all of the power supplies that the library is capable of supporting; and (e) circuitry space for housing circuitry that is used to distribute power within the library and control the operation of the transport assembly. The library is further comprised of a universal bay that defines a universal space which can be used to house circuitry other than the circuitry located in the circuitry space and does not comprise any of the other noted spaces. In one embodiment, the universal bay comprises a partition mount that is capable of supporting a partition that is used to divide the universal space into subsidiary spaces, each capable of accommodating circuitry that enhances or supplements the operation of the library.
FIGS. 1A-1B illustrate the exterior of an embodiment of a data cartridge library that is capable of processing LTO tape cartridges;
FIG. 2 is an exploded view of the embodiment of the data cartridge library illustrated in FIGS. 1A-1B;
FIGS. 3A-3B illustrates an LTO tape data cartridge;
FIGS. 4A-4B illustrate a DLT tape data cartridge;
FIGS. 5A-5B illustrate a displaceable portion of the side of the housing of library shown in FIGS. 1A-1B that allows a user to access the interior of the library;
FIGS. 6A-6C illustrate an entry/exit port associated with the data cartridge library illustrated in FIGS. 1A-1B;
FIGS. 7A-7F illustrate a cartridge magazine that can be attached/detached to/from the entry/exit port illustrated in FIGS. 6A-6C and portions of the magazine;
FIGS. 8A-8E illustrate a multi-piece magazine for storing a plurality of LTO tape cartridges and that is associated with the library shown in FIGS. 1A-1B;
FIGS. 9A-9F illustrate a drive bay that is associated with the library shown in FIGS. 1A-1B and capable of accommodating multiple full-height drives and be adapted to accommodate half-height drives within a space that is capable of accommodating one of the full-height drives;
FIGS. 10A-10B illustrate the space within the library shown in FIGS. 1A-1B that is used to house power supplies and circuitry for distributing electrical power to various power consuming components within the library;
FIGS. 11A-11C a universal bay that is associated with the library shown in FIGS. 1A-1B and capable of accommodating circuitry that enhances of supplements the operation of the library but is not necessary to the operation of the library;
FIGS. 12A-12F illustrate the transport system that is associated with the library shown in FIGS. 1A-1B;
FIG. 13A-13B illustrates aspects of the robotics module that can be readily inserted into and removed from the library illustrated in FIGS. 1A-1B;
FIGS. 14A-14F illustrate the picker that is associated with the library shown in FIGS. 1A-1B;
FIGS. 15 A 1 - 15 D 2 illustrate the operation of the picker in grasping an LTO tape cartridge; and
FIGS. 16A-16D illustrate the ranges of rotation of the crank during which the grasper assembly is in the open position and in the closed position.
With reference to FIGS. 1A, 1B and 2 , an embodiment of a data cartridge library 100 (hereinafter referred to as “library 100 ”) is described. Generally, the library is comprised of: (a) a frame/chassis/cabinet 102 that defines an interior space for containing the other components of the library; (b) entry/exit port 104 for moving data cartridges into and out of the library; (c) a magazine structure 106 for providing a plurality of data cartridge storage spaces that are each capable of accommodating at least one data cartridge; (d) a drive bay 108 for housing a plurality of drives; (e) a plurality of drives 110 located in a drive bay 108 , with each drive capable of writing/reading data onto/from a recording medium located in a cartridge; (f) a transport system 112 for moving a data cartridge between any one of the data cartridge storage spaces provided by the magazine structure 106 and any one of the drives 108 ; (g) a power supply/control module bay 114 for housing at least one power supply and control circuitry that is deemed necessary to the operation of the library; (h) a pair of power supplies 116 A, 116 B that are each located in the power supply/control module bay 114 ; (g) a library control module 118 located in the power supply/control module bay 114 ; and (h) a universal bay 120 for housing electronic circuitry that enhances or supplements the operation of the library but is not deemed necessary to the operation of the library.
Before describing the library 100 in greater detail, the data cartridges that the library 100 is adapted to manipulate are described. The library 100 is adapted for operating on magnetic tape cartridges. Specifically, the library 100 is adapted for operating on cartridges that conform to the following cartridge formats: (a) LTO (linear tape open) and (b) DLT (digital linear tape). It should, however, be appreciated that the library 100 can be adapted to operate on magnetic tape cartridge that conform to other cartridge formats, such as AIT (advanced intelligent tape), SAIT (super advanced intelligent tape), Travan, and the like. Further, it should be appreciated that the library can be adapted to operate on cartridges that contain other types of recording mediums, such as magnetic disk, optical disk and optical tape mediums.
With reference to FIGS. 3A-3B, an LTO tape cartridge 130 comprises a first cartridge face 132 A, a second cartridge face 132 B, a first cartridge side 134 A, a second cartridge side 134 B, a first cartridge end 136 A, and a second cartridge end 136 B. The distance between the first and second cartridge faces 132 A, 132 B defines the height of the cartridge, which is 0.85 in. The distance between the first and second side surfaces 134 A, 134 B defines the width of the cartridge, which is 4.15 in. The distance between the first and second ends 136 A, 136 B defines the depth of the cartridge, which is 4.02 in. The cartridge further comprises an orientation feature 138 that provides a basis for properly orientating the cartridge for insertion in to an LTO tape drive so that data can be read from and/or written to the recording medium within the cartridge. The orientation feature 138 also provides a basis for orienting all of the LTO tape cartridges stored within the library 100 in the same manner. The cartridge also comprises a first pair of gripper notches 140 A, 140 B and a second pair of gripper notches 142 A, 142 B, with one or both pair of notches typically used by a device that grips the cartridge during transport between a magazine and a drive.
With reference to FIGS. 4A-4B, a DLT tape cartridge 150 comprises a first cartridge face 152 A, a second cartridge face 152 B, a first cartridge side 154 A, a second cartridge side 154 B, a first cartridge end 156 A, and a second cartridge end 156 B. The distance between the first and second cartridge faces 152 A, 152 B defines the height of the cartridge, which is 1.00 in. The distance between the first and second side surfaces 154 A, 154 B defines the width of the cartridge, which is 4.15 in. The distance between the first and second ends 156 A, 156 B defines the depth of the cartridge, which is 4.16 in. The cartridge further comprises an orientation feature 158 that provides a basis for properly orientating the cartridge for insertion into a DLT tape drive so that data can be read from and/or written to the recording medium within the cartridge. The orientation feature in an actual DLT is somewhat more complex than the feature shown in FIG. 4A. The orientation feature 158 also provides a basis for orienting all of the DLT tape cartridges stored in the library 100 in the same manner. The cartridge also comprises a single gripper notch 160 , which is typically used by a device that grips the cartridge during transport between a magazine and a drive. The DLT tape cartridge 150 further comprises a recess 162 in the first end 156 A that is typically used for to hold a label, such as a bar-code label, that is used to identify the cartridge.
Having described the tape data cartridges on which the library 100 operates, the library 100 is now described in greater detail. With reference to FIGS. 1A-1B, the library 100 comprises a front side 170 A, a rear side 170 B, a first lateral side 170 C, a second lateral side 170 D, a top side 170 E, and a bottom side 170 F.
Associated with the front side 170 A of the library 100 is the entry/exit port 104 and a power button 172 that allows a user to control the application of electrical power from the power supplies 116 A, 116 B to components of the library. Also associated with the front side 170 A is a touch screen 172 that is used to output information relating to the library 100 to a user and to allow a user to input information (e.g., commands) to the library 100 . Other types of input and output peripherals can be used in place of the touch screen 106 . For instance, a screen can be provided to output information to a user and a keyboard can be provided to allow a user to input information. A front panel 176 that provides ports for accommodating the entry/exit port 104 , the power button 172 and the touch screen 172 is also associated with the front side 170 A. The front panel 176 is also capable of being removed by a user to allow the user to access the interior of the library 100 .
Associated with the rear side 170 B of the library 100 is access to the space within the drive bay 108 , which allows a user to insert/remove a drive into/from the drive bay 108 . User access to the power supply/control module bay 114 is also associated with the rear side 170 B. Specifically, a user can insert/remove a power supply and/or insert/remove a library control module via the access provided to the power supply/control module bay 114 at the rear side 170 B. Also associated with the rear side 170 B is access to the space within the universal bay 120 . In the embodiment of the library illustrated in FIG. 1B, a pair of quad-interface processors are resident in the space defined by the universal bay 170 B.
The first lateral side 170 C comprises a cosmetic exterior skin 178 A. Underlying the skin 178 A is: (a) a side portion 180 A of a top tray 182 , (b) a side portion 184 A of a bottom tray 186 , and (c) portions of the magazine structure 106 that connect the side portion 180 A and the side portion 184 A. The side portion 184 A also accommodates a rail that facilitates rack mounting of the library 100 . Similarly, the second lateral side 170 D comprises a cosmetic exterior skin 178 B. Underlying the skin 178 B is: (a) a side portion 180 B of a top tray 182 , (b) a side portion 184 B of a bottom tray 186 , and (c) portions of the magazine structure 106 that connect the side portion 180 B and the side portion 184 B. The side portion 184 B also accommodates a rail that facilitates rack mounting of the library 100 .
The top side 170 E comprises a mid-portion 188 of the top tray 182 that extends between the side portions 180 A, 180 B. Similarly, the bottom side 170 F comprises a mid-portion 190 of the bottom tray 186 .
The top tray 182 , bottom tray 186 , and the portions of the magazine structure 106 that connect the top tray 182 and the bottom tray 186 form the frame 102 , i.e., the structure that supports the other elements of the library and defines an interior space in which the other elements of the library reside. It should be appreciated that other frame structures are also feasible.
With reference to FIGS. 5A-5B, the removable front panel 176 is described in greater detail. Generally, the removable front panel 176 comprises a panel structure 200 and a plurality of captured screws 202 , i.e. screws that can be actuated to attach/detach the front panel 176 from the remainder of the library 100 but that remain attached to the panel structure 200 to prevent loss. A plurality of threaded holes 204 , each for engaging one of the captured screws 202 , are associated with portions of the library other than the front panel 176 . When the front panel 176 is in place, as shown in FIG. 1A, each of the captured screws 202 is accessible to a user and engages one of the threaded holes 204 , thereby placing the front panel 176 in a “closed” state that prevents a user from accessing the interior of the library 100 via the opening covered by the front panel 176 . If a user wants to access the interior of the library 100 , the captured screws 202 are actuated to disengage the screws from the threaded holes. After all of the captured screws 202 have been disengaged from the threaded holes 204 , the front panel 176 can be removed to expose the interior of the library. The opening provided by removal of the front panel 176 is sufficient to allow a transport module comprised of a picker and a substantial portion of an elevator and an associated tray to be inserted/removed into/from the interior of the library 100 . The front panel 176 also defines openings 206 A- 206 C that respectively accommodate the exit/entry port 104 , the power button 172 , and the touch screen 174 .
With reference to FIG. 5B, the front panel 176 is comprised of a sheet metal portion 208 and a plastic portion 210 that is readily attached/detached to/from the sheet metal portion 208 to expose at least some of the captured screws 202 . The sheet metal portion 208 supports all of the captured screws 202 . Additionally, the sheet metal portion 208 is comprised of: (a) a first screen portion 212 that allows air to flow from the exterior environment into the interior of the library to cool components located therein but prevents electro-magnetic radiation from escaping from the interior of the library; (b) a second screen portion 214 that permits a user to view the interior of the library when the front panel is in the closed state but prevents electro-magnetic radiation from escaping from the interior of the library; (c) openings 216 A- 216 C that respectively form portions of the openings 206 A- 206 C; (d) locator pin holes 218 A- 218 C that cooperate with locator pins that are associated with the plastic portion 210 to facilitate the mating of the plastic portion 210 to the sheet metal portion 208 ; and (e) socket portions 220 A- 220 D of ball-and-socket clips (aka Tinneman clips) that are used to attach/detach the plastic portion 210 to the sheet metal portion 208 .
The plastic portion 210 comprises: (a) a window 222 that, when the plastic portion 210 is properly mated with the sheet metal portion 208 , is located adjacent to the second screen portion 214 of the sheet metal portion 208 ; (b) openings 224 A- 224 C that cooperate with the openings 216 A- 216 C to form the openings 206 A- 206 C when the plastic portion 210 is properly mated with the sheet metal portion 208 ; (c) locator pins 226 A- 226 C that cooperate with the locator pin holes 218 A- 218 C to facilitate alignment of the plastic portion 210 with the sheet metal portion 208 when mating the plastic portion 210 to the sheet metal portion; (d) balls 228 A- 228 D for engaging the sockets 220 A- 220 D associated with the sheet metal portion 208 to facilitate attachment/detachment of the plastic portion 210 to/from the sheet metal portion 208 .
With reference to FIGS. 6A-6C, the entry/exit port 104 is of a type that moves a magazine frame or mount between an “open” position, as shown in FIG. 6A, and a “closed” position as shown in FIG. 1A. When the magazine frame is in the “open” position, a user can attach a magazine to the magazine frame. Further, if a magazine is attached to the magazine frame and the magazine frame is in the open position, a user can insert a data cartridge into the library by placing a data cartridge in one of the slots of the magazine (either before or after the magazine is attached to the magazine frame) and then causing the magazine frame to move to the “closed” position. After the magazine frame is in the “closed” position, the data cartridge is accessible to the transport assembly. Consequently, if desired, the transport assembly can be used to move the data cartridge to any space within the library that is accessible to the transport assembly and capable of storing the data cartridge. One advantage of employing a magazine is that the magazine can be populated with multiple data cartridges, thereby allowing multiple data cartridges to be loaded into the library at one time.
If, on the other hand, a magazine is attached to the magazine frame and a user wants to remove a data cartridge from the library, the magazine frame is placed in the “closed” position. If the desired data cartridge is not already in the magazine, the transport assembly is used to move the desired data cartridge to the magazine. After the desired data cartridge is loaded into the magazine, the magazine frame is caused to move from the “closed” position to the “open” position so that the user can remove the desired data cartridge from the magazine. One advantage of employing a magazine is that multiple data cartridges can be removed from library at one time, either by removing the cartridges from the magazine or disengaging the magazine from the frame.
With reference to FIGS. 6A-6C, the entry/exit port 104 is comprised of: (a) a magazine frame 240 ; (b) a guide structure 242 for supporting the magazine frame 240 and guiding the magazine frame between “open” and “closed” positions; (c) a drive mechanism 244 for applying a motive force to the magazine frame 240 to drive the magazine frame between the “open” and “closed” positions; and (d) a sensor system 246 for use in determining when the magazine frame 240 is in the “open” position and when the magazine frame is in the “closed” position.
With continuing reference to FIGS. 6B-6C, the magazine frame 240 is comprised of: (a) a top guide channel 248 ; (b) a bottom bracket 250 ; (c) a front side bracket 252 that is attached to the top guide channel 248 and the bottom bracket 250 ; (d) a back side bracket 254 that is attached to the top guide channel 248 and the bottom bracket 250 ; (e) a bottom rail 256 that is operatively attached to the bottom bracket 250 ; (f) a rack 258 that is operatively attached to the bottom bracket 250 ; and (g) a stop 262 , operatively attached to the bottom bracket 250 , for preventing the drive mechanism 244 from driving the magazine frame 240 beyond the “open” and “closed” positions.
The front side bracket 252 , back side bracket 254 , a portion of the top guide channel 248 and a portion of the bottom bracket 250 form a magazine receptacle 264 for receiving a magazine.
Further, the front side bracket 252 and back side bracket 254 each respectively comprise a first flange engagement structure 268 A and second flange engagement structure 268 B that are each capable of receiving and engaging one of a pair of flanges associated with a magazine to secure the magazine within the receptacle 264 . The first and second flange engagement structures 268 A, 268 B, if engaging the pair of flanges associated with a magazine, can also be disengaged from the flanges so that the magazine can be removed from the receptacle 264 . The first and second flange engagement structures 268 A, 268 B are located such that the magazine can only be received in the magazine receptacle 264 when the magazine is in a particular orientation.
Also associated with the front side bracket 252 is a cover mounting bracket 270 that support a entry/exit port cover 272 .
With continuing reference to FIGS. 6A-6C, the guide structure 242 is comprised of a top guide structure 274 that engages the top guide channel 248 . The top guide structure 274 is comprised of a bracket 276 that is attached to the exterior skin 178 B and two pairs of rollers 278 A, 278 B that each engage a flange of the top guide channel 248 to guide the magazine frame 240 .
The guide structure 242 is further comprised of a bottom guide structure 280 that engages the bottom rail 256 . The bottom guide structure 280 is comprised of a bracket 282 that supports rail brackets 284 A, 284 B. The rail brackets 284 A, 284 B capture the rail 256 and allow the rail 256 to be linearly displaced so that the frame can be moved between the “open” and “closed” positions.
The drive mechanism 244 is comprised of the rack 258 , a stepper motor 288 that is attached to the mounting bracket 282 , a pinion 290 that is attached to the spindle of the motor 286 , and a cluster gear 292 that connects the rack 258 and the pinion 290 . In operation, the stepper motor 288 produces a motive force that is used to translate the magazine frame 240 between the “closed” and “open” positions. More specifically, the stepper motor 288 produces a rotational motive force that is transferred to the rack 258 via the pinion 290 and the cluster gear 292 . The interaction of the cluster gear 292 and the rack 258 translates the rotation motive force into a translational motive force that is used to move the magazine frame 240 between the “closed” and “open” positions. The stepper motor 288 is capable of being controlled so as to rotate the spindle in either a clockwise direction or a counter-clockwise direction. Rotation of the motor spindle in the clockwise direction causes the magazine frame 240 to move towards the “open” position. Conversely, rotation of the motor spindle in the counter-clockwise direction causes the frame to move towards the “closed” position.
The sensor system 246 is comprised of a flag 294 that is attached to the bottom bracket 250 of the magazine frame 240 , a first detector 296 for detecting when the magazine frame 240 is in the “open” position and that is attached to the mounting bracket 284 B, a second detector 298 for detecting when the magazine frame 240 is in the “closed” position. The second detector 298 is supported by a bracket 300 that is attached to the side portion 184 B of the bottom tray 186 . In operation, the sensor system 246 detects that the magazine frame 240 is in the “open” position when the first detector 296 detects the flag 294 . Similarly, the sensor system 246 detects that the magazine frame 240 is in the “closed” position when the second detector 298 detects the flag 294 .
The sensor system 246 is further comprised of a comb flag 302 and a third sensor 304 that are used to determine the position of the frame 240 when the frame 240 is located between the “open” and “closed” positions.
With continuing reference to FIGS. 6A-6C, the stop 262 engages a portion of the bracket 300 to prevent the drive mechanism 244 from driving the magazine frame 240 beyond the “closed” position. The stop 262 engages the bracket 282 to prevent the drive mechanism 244 from driving the magazine frame 240 beyond the “open” position. The stop 262 is attached to the bottom bracket 250 by four screws 306 . Notably, the magazine frame 240 can be disengaged from the guide structure by unscrewing the four screws 306 so that the stop 262 is no longer attached to the bottom bracket 250 , thereby allowing the frame 240 to be displaced beyond the “open” position.
With reference to FIGS. 7A-7F, an embodiment of a entry/exit port magazine 310 that is capable of holding a plurality of LTO tape cartridges and being engaged/disengaged to/from the magazine frame 240 of the entry/exit port 104 is described. The magazine 310 is comprised of a cartridge holding portion 312 and a dust cover 314 .
The cartridge holding portion 312 is comprised of a bottom wall 316 and a side wall 318 that extends from the bottom wall 316 to a side wall edge 320 , which defines the opening through which an LTO cartridge is inserted/extracted into/from the magazine 310 . The side wall 318 is comprised of first and second end walls 322 A, 322 B and first and second side walls 324 A, 324 B.
Respectively associated with the first and second side walls 324 A, 324 B are first and second frame engagement structures 326 A, 326 B. The first frame engagement structure 326 A is comprised of a first substantially rigid flange 328 A that extends outward from the first side wall 324 A and a first pair of ribs 330 A, 332 A. Similarly, the second frame engagement structure 326 B is comprised of a substantially rigid flange 328 B that extends outward from the second side wall 324 B and a second pair of ribs 330 B, 332 B. The first substantially rigid flange 328 A comprises a first engagement surface 334 A that is located at a first distance from the edge 320 . Similarly, the second substantially rigid flange 328 B comprises a second engagement surface 334 B that is also located at the first distance from the edge 320 . The bottom edges of the first pair of ribs 330 A, 332 A and second pair of 330 B, 332 B are each located at a second distance from the edge 320 that is less than the first distance. The difference between the first and second distances is slightly greater than the thickness of the material in which the first and second flange engagement structures 268 A, 268 B have been established.
To engage the magazine 310 to the frame 240 of the entry/exit port 104 (assuming the port is in the “open” position), the magazine is inserted into the receptacle 264 such that the substantially rigid flanges 328 A, 328 B are respectively pass through the wider openings located towards the top ends of the first and second flange engagement structures 268 A, 268 B. The first pair of ribs 330 A, 332 A and the second pair of ribs 330 B, 332 B respectively engage the back side bracket 254 and the front side bracket 252 to limit the extent to which the flanges 328 A, 328 B can pass through the larger portions of the first and second flange engagement structures 268 A, 268 B. At this point, the magazine 310 is displaced towards the bottom bracket 250 so that the first engagement surface 334 A of the first flange 328 A engages the posterior side of the back side bracket 254 and the second engagement surface 334 B of the second flange 328 B engages the posterior side of the front side bracket 252 . At this point, the first engagement surface 334 A is engaging the posterior side of the back side bracket 254 and the bottom edges of the first pair of ribs 330 A, 332 A are engaging the anterior surface of the back side bracket 254 . Likewise, the second engagement surface 334 B is engaging the posterior side of the front side bracket 252 and the second pair of ribs 330 B, 332 B are engage the anterior surface of the front side bracket 252 . With the first and second engagement surfaces 334 A, 334 B and the bottom edges of the first and second pairs of ribs 330 A, 332 A, 330 B, 332 B engaged to the frame 240 in this manner, the position of the magazine is substantially fixed in two orthogonal dimensions. An end rib 334 associated with the first end wall 322 A engages the bottom bracket 250 to limit the extent to which the magazine 310 can be displaced towards the bottom bracket 250 . To disengage the magazine 310 from the frame 240 (still assuming the port 104 is in the “open” condition), the attachment operation is reversed, i.e., the magazine 310 is displaced away from the bottom bracket 250 until the first and second flanges can be pulled through the wider openings located towards the top ends of the first and second flange engagement structures 268 A, 268 B to disengage the magazine 310 from the frame.
The first and second substantially rigid flanges 328 A, 328 B are also located so as to establish an asymmetry that constrains the magazine 310 to be mounted to the frame 240 in a single, preferred orientation. To elaborate, the asymmetry is established by locating the first flange 328 A such that the flange is a first distance from the first end wall 322 A and locating the second flange 328 B such that the flange is a second distance from the second end wall 322 B that is not equal to the first distance. In the illustrated embodiment, the first flange 328 A is located at a first distance from the first end wall 322 A and a second distance from the second end wall 322 B that is different than the first distance, and the second flange 328 B is located the same second distance from the second end wall 322 B. In addition, a cut-out 249 associated with the top guide channel 248 and the lack of a comparable cut-out associated with the bottom bracket 252 prevent the magazine 310 from being mounted to the frame 240 in an undesired orientation.
Associated with the bottom wall 316 are a plurality of holes 336 A- 336 D that are each engaged by a protrusion on the dust cover 314 of another magazine 310 to facilitate stacking of the magazines. There are numerous alternatives to the holes 336 A- 336 D. Among the possible alternatives are: (a) one or more recesses that are each adapted to engage a protrusion on the dust cover of another magazine; and (b) one or more protrusions that are each adapted to engage a hole on the dust cover of another magazine. Different numbers of structures can be utilized. Moreover, a structure with a different shape than the holes 336 A- 336 D is also feasible.
With reference to FIGS. 7A, 7B, and 7 D, the dust cover 314 comprises an exterior surface 338 and an interior surface 340 . Associated with the exterior surface are protrusions 342 A- 342 D that are each capable of mating with one of the plurality of holes 336 A- 336 D associated with another magazine to facilitate stacking of the magazines. There are numerous alternative structures to the protrusions 342 A- 342 D that can be used to facilitate stacking of magazines. For instances, holes or recesses that mate with protrusions located on the bottom wall of a magazine can be used in place of the protrusions 342 A- 342 D. Different numbers of structures and/or structures with different shapes from those illustrated can also be utilized.
Associated with the interior surface 340 of the cover 314 are a first pair of detents 344 A, 344 B and a second pair of detents 346 A, 346 B that are used to fasten the cover 314 to the cartridge holding portion 312 . To elaborate, the first pair of detents 344 A, 344 B are adapted to engage a portion of a lip that is associated with the edge 320 and that is located adjacent to first flange 328 A, and the second pair of detents 346 A, 346 B are adapted to engage a portion of the lip that is located adjacent to the second flange 328 B. A pair of tabs 348 A, 348 B allow a user to disengage the cover 314 from the cartridge holding portion 312 . To elaborate, the first tab 348 A allows a user to flex the cover 314 (which is preferably made of plastic) adjacent to the first pair of detents 344 A, 344 B in a manner that disengages the first pair of detents 344 A, 344 B from the lip. The second tab 348 B similarly allows a user to disengage the second pair of detents 346 A, 346 B from the lip.
Respectively associated with the first and second end walls 322 A, 322 B are first and second bar code areas 350 A, 350 B that are each capable of accommodating a bar code. In many cases, the bar code is imprinted on a label that is placed in the bar code area. In some embodiments, a single bar code area that is associated with one of the first and second end walls 322 A, 322 B or one of the first and second side walls 324 A, 324 B is adequate. In other embodiments, two or more bar codes areas, each associated with one of the first and second end walls 322 A, 322 B and the first and second side walls 324 A, 324 B is needed or desirable.
Extending from the second end wall 322 B is a third bar code area 350 C, which is shown with a bar code label attached. The third bar code area is located so that when the magazine 310 is within the library, the magazine can be identified. To elaborate, when the magazine 310 is attached to the magazine frame 240 , any bar codes associated with the first and second bar code areas 350 A, 350 B or associated with any other locations on the side wall 318 are likely to be difficult for a bar code reader associated with the transport system 112 to read. In contrast, a bar code associated with the third bar code area 350 C is readily visible to such a bar code reader. Generally, any bar code associated with the third bar code area 350 C is identical to the bar code associated with the first and second bar code areas 350 A, 350 B. However, it is not required that a bar code associated with an individual magazine be identical to any other bar codes associated with the magazine.
With reference to FIGS. 7E and 7F, the bottom wall 316 , the first and second end walls 322 A, 322 B, the first and second side walls 324 A, 324 B define an interior space that is capable of accommodating a plurality of the LTO tape cartridges. In the illustrated embodiment, three LTO cartridges are shown located within the interior space of the magazine 310 . A plurality of partition structures 352 divide the interior space into a plurality of data cartridge storage spaces 354 , each being capable of accommodating a single LTO tape cartridge. Each partition 352 is comprised of a pair of panels 356 A, 356 B and a pair of spacer ribs 358 A, 358 B. The spacer ribs 358 A, 358 B serve to space cartridges that are stored in adjacent storage spaces a sufficient distance from one another so that the picker associated with the transport assembly can grasp one of the cartridges without interference from any adjacent cartridges. Associated with each of the storage space 354 is a pair of centering fins 360 A, 360 B that serve to center a data cartridge within the storage space.
Also associated with each storage space 354 is an orientation structure 362 that prevents insertion of an LTO tape cartridge into space if the cartridge does not have the proper orientation. To elaborate, the orientation structure 362 is designed to accommodate or complement the orientation feature 138 of an LTO tape cartridge that is being inserted into the space and has the desired orientation. If, however, an LTO tape cartridge is being inserted into the space and does not have the desired orientation, the orientation structure 362 is not positioned to accommodate the orientation feature 138 of the LTO tape cartridge and, as such, interferes with the insertion of the LTO tape cartridge into the space. Further, all of the orientation structures 362 in the magazine 310 are substantially identical to one another and in substantially the same location in each storage space. Consequently, the orientation structures cumulatively operate to ensure that all of the cartridges that can be held by the magazine have the same orientation within the magazine. This characteristic of the magazine, in combination with the features of the magazine that require the magazine to be in a specific orientation for attachment to the magazine frame 240 of the entry/exit port 104 , ensure that all of the data cartridge that are placed in the library via the entry/exit port 104 have the same orientation relative to the picker, which facilitates the design of the picker.
Additionally, a retaining structure 364 is associated with each of the storage spaces 354 to prevent unintentional dislodgement of an LTO cartridge located in the space. Generally, the retaining structure comprises a cantilever member with one end fixed to the cartridge holding portion 312 and a free or movable end that supports a detent for engaging the notch 142 B of an LTO cartridge. In operation, the spring force provided by the cantilever member urges the detent into engagement with the notch 142 B during insertion of the LTO cartridge into the cartridge holding portion 312 and allows the detent to disengage from the notch during extraction of the cartridge by a picker or user.
Each of the storage spaces 354 also comprises portions of stand-offs 366 A, 366 B that ensure that the cartridge end 136 A of the LTO cartridge is substantially the same distance from the bottom wall of the 316 of the magazine 310 as the cartridge end 156 A of a DLT tape cartridge is from the bottom wall of a magazine designed to accommodate DLT tape cartridges. In libraries that are capable of operating on cartridges with different dimensions, such as library 100 , the use of stand-offs to ensure this consistency of cartridge location simplifies the picker design.
Associated with the side wall 324 A are two orientation surfaces 368 A, 368 B that can each be used by a picker to locate the data cartridge storage spaces 354 . The cover 314 is designed to accommodate the orientation surfaces 368 A, 368 B.
Associated with the side wall 324 B are blockers 369 A, 369 B that serve to prevent the magazine frame 240 of the entry/exit port 104 from reaching the closed position, as shown in FIG. 1A, if the magazine 310 is not fully engaged to the frame 240 .
Associated with one of the partitions 352 is a strut 370 that connects the pair of panels 356 A, 356 B. The strut 370 prevents the first and second side walls 324 A, 324 B from bowing towards or away from one another. A picker space 372 associated with the storage space 254 immediately adjacent to the first end wall 322 provides space that is utilized by a picker in inserting a data cartridge into the space 254 and retracting a data cartridge from the space 254 .
With reference to FIGS. 2 and 8A- 8 E, the magazine structure 106 comprises first and second banks of magazines 380 A, 380 B. The first bank of magazines 380 A is described with the understanding that the second bank of magazines 380 B (other than accommodating the entry/exit port 104 ) is substantially identical. The first bank of magazines 380 A is comprised of four, multi-piece magazines 382 A- 382 D. With reference to FIG. 8A, each of the multi-piece magazines 328 A- 382 D is comprised of a back side 384 , a first side 386 A, and a second side 386 B that cumulatively define an interior space for accommodating a plurality of data cartridges and an opening through which data cartridges can be inserted/extracted into/from the interior space. Each of the multi-piece magazines 382 A- 382 D also comprises a partitioning structure 388 that divides the interior space into a plurality of storage spaces that are each capable of accommodating an LTO tape data cartridge.
With reference to FIGS. 8A-8E, each of the multi-piece magazines 382 A- 382 D is comprised of a C-channel 390 and at least one magazine clip 392 . The C-channel 390 forms substantially the entire back side 384 of the magazine and portions of the first and second sides 386 A, 386 B of the magazine. The C-channel 390 comprises first and second C-channel sides 394 A, 394 B and a C-channel mid-section 396 that extends between and connects the first and second C-channel sides 394 A, 394 B. The C-channel mid-section 396 forms substantially the entire back side 384 of the magazine. In addition, the C-channel mid-section 396 comprises a plurality of stand-offs 398 , with each stand-off positioned to engage at least one LTO tape cartridge located in one of the storage spaces provided by the magazine such that the cartridge end 136 A of the LTO cartridge is substantially the same distance from the back side 384 as the cartridge end 156 A of a DLT tape cartridge is from the back side 384 of a magazine designed to accommodate DLT tape cartridges. In libraries that are capable of operating on cartridges with different dimensions, such as library 100 , the use of stand-offs to ensure this consistency of cartridge location simplifies the picker design. The C-channel mid-section 396 further comprises a plurality of rivet holes 400 that allow the C-channel 390 to be attached to the top tray 182 , bottom tray 186 , and exterior skins 178 A, 178 B by rivets. The C-channel 390 , in connecting the top tray 182 and the bottom 186 to one another, also provides structural support that is not provided by the exterior skins 178 A, 178 B. Consequently, each of the C-channels forms a structural portion the frame 102 .
Respectively associated with the first and second C-channel sides 394 A, 394 B are first latch elements 402 A, 402 B that each form a latch with a second latch element associated with the magazine clip 392 to join the magazine clip and the C-channel 390 . In the illustrated embodiment, the first latch elements 402 A- 402 B are holes. However, other types of latch elements are feasible. A plurality of slits 404 are also associated with each of the first and second C-channel sides 394 A, 394 B. The slits 404 cooperate with slot defining structures that are associated with the magazine clip 392 to further fix the magazine clip 292 to the C-channel 390 in the manner that slotted cards are interconnected to build a house of cards.
The C-channel 390 is preferably made of a metal (aluminum, sheet steel etc.). Further, the C-channel of each of the magazines in the first bank of magazines 380 A forms a portion of the frame 102 of the library 101 . This is also the case with respect to the second bank of magazines 380 B with the possible exception of the magazine situation above the entry/exit port 104 .
The magazine clip 392 is comprised of a side wall 406 that extends from a bottom edge 408 to a top edge 410 that defines an opening through which an LTO cartridge is inserted/extracted into/from the magazine when the magazine clip 392 is joined to the C-channel 390 . The side wall 406 is comprised of first and second end walls 412 A, 412 B and first and second side walls 414 A, 414 B. Associated with the first and second side walls 414 A, 414 B are second latch elements 416 A- 416 B that respectively cooperate with first latch elements 402 A- 402 B of the C-channel 390 to connect the magazine clip 392 and the C-channel 390 . In the illustrated embodiment, the second latch elements 416 A- 416 B are each substantially rigid flanges. In joining the magazine clip 392 to the C-channel 390 , the magazine clip 392 are brought together such that the second latch elements 416 A, 416 B cause the first and second C-channel sides 394 A, 394 B to flex or spread apart. Once, however, the second latch elements 416 A, 416 B reach th