Title:
IMPRINTER UTILIZING COMPENSATING ROLLER PLATEN
United States Patent 3592134
Abstract:
Disclosed is an imprinter for printing upon documents from a printing plate, the imprinter utilizing a compensating roller platen. The platen may be of the dry roll-type and includes a plastic or nylon outer sleeve of typically 80 to 90 durometer hardness, Shore "D" scale. An inner sleeve is also provided, the inner sleeve being rotatably mounted with respect to the imprinter carriage. This sleeve has a peripheral grooved portion disposed along a substantial portion of the length thereof. The inner sleeve is also of 80 to 90 durometer hardness, Shore "D" scale. Disposed between the inner and outer sleeves is an intermediate, annular, cylindrical resilient member which has a Shore "D" scale hardness of typically 40 to 45 durometer and which may be may be made of rubber. Because of the groove on the inner sleeve, the resilient intermediate member has room in which to retract whenever the combined thickness of the printing plate and the document encountered by the roller platen is greater than that for which the imprinter was originally set. Thus, a wide range of printing plate and document thicknesses may be accommodated.
US Patent References:
Rollers
Macleod - October 1964 - 3152387
COMPRESSIBLE PRINTING ROLL
Ross - September 1969 - 3467009
Surface decorating method and apparatus
Von Webern et al. - February 1937 - 2069789
Printing plate material
Vamvaketis - April 1956 - 2741297
Printing apparatus
Maul - May 1961 - 2982205
Rollers
Macleod - October 1964 - 3152387
COMPRESSIBLE PRINTING ROLL
Ross - September 1969 - 3467009
Surface decorating method and apparatus
Von Webern et al. - February 1937 - 2069789
Printing plate material
Vamvaketis - April 1956 - 2741297
Printing apparatus
Maul - May 1961 - 2982205
Application Number:
04/725292
Publication Date:
07/13/1971
Filing Date:
04/30/1968
View Patent Images:
Export Citation:
Assignee:
Farrington Business Machines Corporation (Springfield, VA)
Primary Class:
Other Classes:
101/252, 100/169, 492/18
International Classes:
B41L45/02; B41L45/00; B41F3/20
Field of Search:
101/269,375,376,379,401.3,395,36,37,250,222,216,212 29/110,113,116,130 100/155,160,163,169,162B,93
US Patent References:
| 2997406 | Method and apparatus for cast-coating paper | August 1961 | Freeman et al. | |
| 3022542 | Porous polyamide articles and process for the production thereof | February 1962 | Davis | |
| 3063365 | Printing machine | November 1962 | Johnson, Jr. et al. | |
| 3082683 | Roll structure | March 1963 | Justus | |
| 3096949 | Air expandable core shaft | July 1963 | Huffman | |
| 3179046 | Platen roller mounting means in manually operable printing machines | April 1965 | Maul et al. | |
| 3232230 | Traveling roller carriage means in bed and cylinder printers | February 1966 | Sheldon | |
| 3374733 | Card printing machine and type inking apparatus | March 1968 | Goodrich | |
| 3425347 | RESILIENT PRINTING PLATE | February 1969 | Nard |
Primary Examiner:
Burr, Edgar S.
Claims:
I claim
1. A compensating roller platen for use with apparatus for imprinting a document with information from raised characters on a printing plate comprising
2. Apparatus as in claim 1 where the hardness of said intermediate member is 40 to 45 durometer and said inner shaft is 80 to 90 durometer, all hardness values being in Shore "D" scale.
3. Apparatus as in claim 2 where said outer sleeve is of 80 to 90 durometer hardness, Shore "D" scale.
4. Apparatus as in claim 2 where said intermediate member is rubber.
5. Apparatus as in claim 4 where said inner shaft is made of nylon.
6. Apparatus as in claim 5 where said outer sleeve is made of nylon.
7. Apparatus as in claim 1 where said outer sleeve is ink porous.
8. Apparatus as in claim 7 where said peripheral grooved portion extends over a substantial portion but not all of the length of said inner shaft.
9. Imprinting apparatus for imprinting on a document comprising:
10. Apparatus as in claim 9 where the hardness of said intermediate member is 40 to 45 durometer and said inner shaft is 80 to 90 durometer, all hardness values being in Shore "D" scale.
11. Apparatus as in claim 10 where said outer sleeve is of 80 to 90 durometer hardness, Shore "D" scale.
12. Apparatus as in claim 9 where said outer sleeve is ink porous.
13. Apparatus as in claim 9 where said peripheral grooved portion extends over a substantial portion but not all of the length of said inner shaft.
1. A compensating roller platen for use with apparatus for imprinting a document with information from raised characters on a printing plate comprising
2. Apparatus as in claim 1 where the hardness of said intermediate member is 40 to 45 durometer and said inner shaft is 80 to 90 durometer, all hardness values being in Shore "D" scale.
3. Apparatus as in claim 2 where said outer sleeve is of 80 to 90 durometer hardness, Shore "D" scale.
4. Apparatus as in claim 2 where said intermediate member is rubber.
5. Apparatus as in claim 4 where said inner shaft is made of nylon.
6. Apparatus as in claim 5 where said outer sleeve is made of nylon.
7. Apparatus as in claim 1 where said outer sleeve is ink porous.
8. Apparatus as in claim 7 where said peripheral grooved portion extends over a substantial portion but not all of the length of said inner shaft.
9. Imprinting apparatus for imprinting on a document comprising:
10. Apparatus as in claim 9 where the hardness of said intermediate member is 40 to 45 durometer and said inner shaft is 80 to 90 durometer, all hardness values being in Shore "D" scale.
11. Apparatus as in claim 10 where said outer sleeve is of 80 to 90 durometer hardness, Shore "D" scale.
12. Apparatus as in claim 9 where said outer sleeve is ink porous.
13. Apparatus as in claim 9 where said peripheral grooved portion extends over a substantial portion but not all of the length of said inner shaft.
Description:
BACKGROUND OF THE INVENTION
This invention relates to imprinters and in particular to imprinters of the type which compensate for varying thicknesses of printing plates and/or documents used therewith. Further, in particular, this invention relates to an improved compensating roller platen.
In the imprinting art, it is well known that the documents printed upon are usually read by character reading equipment to facilitate automatic data processing. Because of the inherent sensitivity of the reading equipment, the printed matter which is read must be of the highest quality to minimize errors and to maximize document throughput.
A particular frequent and troublesome problem relating to the imprinting of documents is smudging. This quite often causes the character reader to make errors thereby decreasing document throughput. Smudging, in turn, is generally caused by excessive printing pressure. Usually, excessive printing pressure occurs whenever the combined thickness of the printing plate or credit card and of the documents encountered by the roller platen is greater than that for which the imprinter was originally set. Since, in practice, a wide range of card thicknesses are encountered because certain cards are used more than others, the problem of smudging is quite widespread and severe.
Further, the varying card and/or document thicknesses encountered in practice cause the print density of the printed characters to vary from very light to very heavy, thereby further restricting the capability of the character readers to efficiently and accurately read the printed matter.
Another problem with prior art imprinters arises because of a tendency to crush the embossed characters on the card or, in other words, to deboss the characters. After a card has be sufficiently debossed, it is quite difficult to obtain satisfactory print quality from it.
Many prior art devices have been proposed to compensate for the above discussed problems; however, most of these are awkward, expensive and difficult to maintain.
SUMMARY OF THE INVENTION
Thus, it is a primary object of this invention to provide an improved printing apparatus which substantially reduces smudging and which provides a relatively constant print density over a substantial range of combined printing plate-document thicknesses.
It is a further object of this invention to provide an improved apparatus of the above type which is economical to manufacture and simple to operate and maintain.
It is a further object of this invention to provide an improved compensating roller platen.
It is a further object of this invention to provide an improved imprinting apparatus and roller platen which minimizes the debossing problem.
Other objects and advantages of this invention will become apparent upon reading the appended claims in conjunction with the following detailed description and the attached drawing.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a perspective view of an imprinter utilizing the compensating roller platen of this invention.
FIG. 2 is an end view of an illustrative embodiment of a roller platen in accordance with the invention.
FIG. 3 is a cross-sectional view taken on the line 3-3 of FIG. 2.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
Referring to FIG. 1, there is shown a perspective view of an imprinter utilizing the improved roller platen of the invention. The imprinter comprises a base 10 upon the upper surface of which is disposed a print bed 12. Positioned upon the print bed 12 is a printing plate 14 such as a credit card. Disposed over the plate 14 is a document 16 upon which is printed any information embossed or raised from the plate 14 in a well-known manner. Typically, the document 16 is a sales invoice and imprinted upon the document is a customer's name and account number such as indicated at 17. Although not shown the imprinter of FIG. 1 may also include digit wheels which may be set by the operator to provide the printing of variable information upon the document 16. Respectively disposed within the two long sides of base 10 are a pair of lengthwise slots, one of which is indicated at 18 and the other of which is not shown in FIG. 1. Mounted for longitudinal movement along the slots is a carriage 20 which contains a roller platen 22 which may be of the inked or dry roll-type. Although not shown, a shaft extends between the vertical legs 24 and 26 of carriage 20, the platen 22 being mounted upon the shaft for rolling movement whenever the platen engages a document placed upon the print bed 12. The manner of mounting the roller platen and its associates shaft is a matter of design and many means for doing this are well known to those of ordinary skill in the art.
Reference should now be made to FIGS. 2 and 3, which respectively show an end view and a cross-sectional view of an illustrative embodiment of a roller platen in accordance with this invention. For purposes of illustration the platen of FIGS. 2 and 3 is of the dry roll-type. The roller platen comprises an outer sleeve 28, which is typically made of nylon and which has a typical hardness of 80 to 90 durometer, Shore "D" scale. All hardness values hereinafter are in the Shore "D" scale. Alternatively, the outer sleeve 28 may be ink porous rather than of the dry roll-type.
The roller platen also includes an inner sleeve or shaft 30 which, as best seen in FIG. 3, has a peripheral, grooved portion 32 which extends entirely around shaft 30 and along a substantial portion of the length thereof but less than the length of the roller platen. Further, the length of grooved portion 32 is greater than the height of print field of the printing plate, which in FIG. 1, for example, would extend from the bottom of the NUMBER indicated at 17 to the top of the NAME also indicated thereat. Thus, the print field constitutes that area of the printing plate 14 containing the information to be printed. As will become more apparent hereinafter, the importance of the peripheral grooved portion is paramount and its presence brings about the desired results claimed for this invention. A journal opening 34 extends through the sleeve 30 which is adapted for rotatable mounting upon the shaft (not shown, but discussed hereinbefore) which extends between the vertical legs 24 and 26 of the carriage 20. The opening 34 is optional and other means for rotatably mounting the sleeve 30 with respect to the carriage 20 may be provided. The inner sleeve 30 is also typically made of nylon and has a typical hardness of 80 to 90 durometer.
Disposed between the inner and outer sleeves 28 and 30 is an annular, cylindrical member 36 which is typically made of rubber and which has a typical hardness of 40 to 45 durometer.
In operation, the distance between the outer peripheral edge of outer sleeve 28 and the print bed will vary in accordance with the combined thickness of the particular printing plate 14 and document 16 disposed upon the print bed 12 of the imprinter of FIG. 1. To insure relatively constant printing pressure regardless of the combined thickness encountered, the compensating roller platen 22 will permit the resilient member 36 to withdraw or retract into the peripheral grooved portion 32 to thereby retract the platen from the print bed whenever the thickness is less than that for which the imprinter was originally set. Thus, because of the grooved portion 32, a wide range of compensation is provided thereby minimizing the amount of smudging and causing a relatively constant print density.
It is to be understood that, although the invention has been described in relation to a roller platen of the dry roll-type, it may also be employed with platens of the inked roll-type wherein an inked sleeve would be disposed around either the sleeve 28 or the member 36 if the sleeve 28 were dispensed with. If the sleeve 28 were dispensed with, then the inked sleeve would become the "outer sleeve" as used in the claims.
Although particular materials have been described as being typical constituents for the members 28, 30, and 36, it is to be understood that any material may be used so long as there is maintained between these members a relative resiliency or hardness which permits them to retract into the groove 32 whenever the situation so requires.
Further, although the resilient member 36 is shown as being of solid construction, a plurality of annular, resilient members may be disposed coaxially between the sleeves 28 and 30. In such a case, a plurality of peripheral, grooved portions would extend along the length of sleeve 30 and would be respectively disposed adjacent the plurality of annular, resilient members to thereby permit the resilient members to retract into the plurality of grooved portions. The resilient members might be O-rings or the like.
The length of the groove 32 with respect to the overall length of the inner sleeve 30 can be adjusted to meet the demands of the particular situation. The only requirement is that the length thereof be sufficient to permit enough retraction of the resilient member 36 so as to insure effective compensating action.
Typical values of some of the dimensions of the roller platen of FIGS. 2 and 3 are now given to illustrate one working embodiment of the invention which has performed satisfactorily over a wide range of combined printing plate-document thicknesses. The outer diameter of the outer sleeve 28 may be 1 inch; the outer diameter of the annular member 36 may be seven-eighths inch; the outer diameter of the nongrooved portion of the inner sleeve 30 may be three-eighths inch; the diameter of journal hole 34 may be one-fourth inch; the depth of the grooved portion 32 may be one thirty-seconds inch; the overall length of the sleeve 30 may be 1 1/16 inches; and the distance between the outer end of sleeve 30 and the outer end of groove 32, one-eighth inch.
Although certain values for dimensions and durometers have been stated hereinbefore, it is to be understood that these values will generally vary depending, among other things, on the particular imprinter configuration utilized.
Numerous modifications of the invention will become apparent to one of ordinary skill in the art upon reading the foregoing disclosure. During such a reading it will be evident that this invention provides a unique imprinter with compensating roller for accomplishing the objects and advantages herein stated. Still other objects and advantages and even further modifications will become apparent from this disclosure. It is to be understood, however, that the foregoing disclosure is to be considered exemplary and not limitative, the scope of the invention being defined by the following claims.
This invention relates to imprinters and in particular to imprinters of the type which compensate for varying thicknesses of printing plates and/or documents used therewith. Further, in particular, this invention relates to an improved compensating roller platen.
In the imprinting art, it is well known that the documents printed upon are usually read by character reading equipment to facilitate automatic data processing. Because of the inherent sensitivity of the reading equipment, the printed matter which is read must be of the highest quality to minimize errors and to maximize document throughput.
A particular frequent and troublesome problem relating to the imprinting of documents is smudging. This quite often causes the character reader to make errors thereby decreasing document throughput. Smudging, in turn, is generally caused by excessive printing pressure. Usually, excessive printing pressure occurs whenever the combined thickness of the printing plate or credit card and of the documents encountered by the roller platen is greater than that for which the imprinter was originally set. Since, in practice, a wide range of card thicknesses are encountered because certain cards are used more than others, the problem of smudging is quite widespread and severe.
Further, the varying card and/or document thicknesses encountered in practice cause the print density of the printed characters to vary from very light to very heavy, thereby further restricting the capability of the character readers to efficiently and accurately read the printed matter.
Another problem with prior art imprinters arises because of a tendency to crush the embossed characters on the card or, in other words, to deboss the characters. After a card has be sufficiently debossed, it is quite difficult to obtain satisfactory print quality from it.
Many prior art devices have been proposed to compensate for the above discussed problems; however, most of these are awkward, expensive and difficult to maintain.
SUMMARY OF THE INVENTION
Thus, it is a primary object of this invention to provide an improved printing apparatus which substantially reduces smudging and which provides a relatively constant print density over a substantial range of combined printing plate-document thicknesses.
It is a further object of this invention to provide an improved apparatus of the above type which is economical to manufacture and simple to operate and maintain.
It is a further object of this invention to provide an improved compensating roller platen.
It is a further object of this invention to provide an improved imprinting apparatus and roller platen which minimizes the debossing problem.
Other objects and advantages of this invention will become apparent upon reading the appended claims in conjunction with the following detailed description and the attached drawing.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a perspective view of an imprinter utilizing the compensating roller platen of this invention.
FIG. 2 is an end view of an illustrative embodiment of a roller platen in accordance with the invention.
FIG. 3 is a cross-sectional view taken on the line 3-3 of FIG. 2.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
Referring to FIG. 1, there is shown a perspective view of an imprinter utilizing the improved roller platen of the invention. The imprinter comprises a base 10 upon the upper surface of which is disposed a print bed 12. Positioned upon the print bed 12 is a printing plate 14 such as a credit card. Disposed over the plate 14 is a document 16 upon which is printed any information embossed or raised from the plate 14 in a well-known manner. Typically, the document 16 is a sales invoice and imprinted upon the document is a customer's name and account number such as indicated at 17. Although not shown the imprinter of FIG. 1 may also include digit wheels which may be set by the operator to provide the printing of variable information upon the document 16. Respectively disposed within the two long sides of base 10 are a pair of lengthwise slots, one of which is indicated at 18 and the other of which is not shown in FIG. 1. Mounted for longitudinal movement along the slots is a carriage 20 which contains a roller platen 22 which may be of the inked or dry roll-type. Although not shown, a shaft extends between the vertical legs 24 and 26 of carriage 20, the platen 22 being mounted upon the shaft for rolling movement whenever the platen engages a document placed upon the print bed 12. The manner of mounting the roller platen and its associates shaft is a matter of design and many means for doing this are well known to those of ordinary skill in the art.
Reference should now be made to FIGS. 2 and 3, which respectively show an end view and a cross-sectional view of an illustrative embodiment of a roller platen in accordance with this invention. For purposes of illustration the platen of FIGS. 2 and 3 is of the dry roll-type. The roller platen comprises an outer sleeve 28, which is typically made of nylon and which has a typical hardness of 80 to 90 durometer, Shore "D" scale. All hardness values hereinafter are in the Shore "D" scale. Alternatively, the outer sleeve 28 may be ink porous rather than of the dry roll-type.
The roller platen also includes an inner sleeve or shaft 30 which, as best seen in FIG. 3, has a peripheral, grooved portion 32 which extends entirely around shaft 30 and along a substantial portion of the length thereof but less than the length of the roller platen. Further, the length of grooved portion 32 is greater than the height of print field of the printing plate, which in FIG. 1, for example, would extend from the bottom of the NUMBER indicated at 17 to the top of the NAME also indicated thereat. Thus, the print field constitutes that area of the printing plate 14 containing the information to be printed. As will become more apparent hereinafter, the importance of the peripheral grooved portion is paramount and its presence brings about the desired results claimed for this invention. A journal opening 34 extends through the sleeve 30 which is adapted for rotatable mounting upon the shaft (not shown, but discussed hereinbefore) which extends between the vertical legs 24 and 26 of the carriage 20. The opening 34 is optional and other means for rotatably mounting the sleeve 30 with respect to the carriage 20 may be provided. The inner sleeve 30 is also typically made of nylon and has a typical hardness of 80 to 90 durometer.
Disposed between the inner and outer sleeves 28 and 30 is an annular, cylindrical member 36 which is typically made of rubber and which has a typical hardness of 40 to 45 durometer.
In operation, the distance between the outer peripheral edge of outer sleeve 28 and the print bed will vary in accordance with the combined thickness of the particular printing plate 14 and document 16 disposed upon the print bed 12 of the imprinter of FIG. 1. To insure relatively constant printing pressure regardless of the combined thickness encountered, the compensating roller platen 22 will permit the resilient member 36 to withdraw or retract into the peripheral grooved portion 32 to thereby retract the platen from the print bed whenever the thickness is less than that for which the imprinter was originally set. Thus, because of the grooved portion 32, a wide range of compensation is provided thereby minimizing the amount of smudging and causing a relatively constant print density.
It is to be understood that, although the invention has been described in relation to a roller platen of the dry roll-type, it may also be employed with platens of the inked roll-type wherein an inked sleeve would be disposed around either the sleeve 28 or the member 36 if the sleeve 28 were dispensed with. If the sleeve 28 were dispensed with, then the inked sleeve would become the "outer sleeve" as used in the claims.
Although particular materials have been described as being typical constituents for the members 28, 30, and 36, it is to be understood that any material may be used so long as there is maintained between these members a relative resiliency or hardness which permits them to retract into the groove 32 whenever the situation so requires.
Further, although the resilient member 36 is shown as being of solid construction, a plurality of annular, resilient members may be disposed coaxially between the sleeves 28 and 30. In such a case, a plurality of peripheral, grooved portions would extend along the length of sleeve 30 and would be respectively disposed adjacent the plurality of annular, resilient members to thereby permit the resilient members to retract into the plurality of grooved portions. The resilient members might be O-rings or the like.
The length of the groove 32 with respect to the overall length of the inner sleeve 30 can be adjusted to meet the demands of the particular situation. The only requirement is that the length thereof be sufficient to permit enough retraction of the resilient member 36 so as to insure effective compensating action.
Typical values of some of the dimensions of the roller platen of FIGS. 2 and 3 are now given to illustrate one working embodiment of the invention which has performed satisfactorily over a wide range of combined printing plate-document thicknesses. The outer diameter of the outer sleeve 28 may be 1 inch; the outer diameter of the annular member 36 may be seven-eighths inch; the outer diameter of the nongrooved portion of the inner sleeve 30 may be three-eighths inch; the diameter of journal hole 34 may be one-fourth inch; the depth of the grooved portion 32 may be one thirty-seconds inch; the overall length of the sleeve 30 may be 1 1/16 inches; and the distance between the outer end of sleeve 30 and the outer end of groove 32, one-eighth inch.
Although certain values for dimensions and durometers have been stated hereinbefore, it is to be understood that these values will generally vary depending, among other things, on the particular imprinter configuration utilized.
Numerous modifications of the invention will become apparent to one of ordinary skill in the art upon reading the foregoing disclosure. During such a reading it will be evident that this invention provides a unique imprinter with compensating roller for accomplishing the objects and advantages herein stated. Still other objects and advantages and even further modifications will become apparent from this disclosure. It is to be understood, however, that the foregoing disclosure is to be considered exemplary and not limitative, the scope of the invention being defined by the following claims.