Title:
GUIDING DEVICE IN A MACHINE FOR MANUFACTURING VENETIAN BLINDS
United States Patent 3824657


Abstract:
In a machine for manufacturing Venetian blinds which consist of slats and ladder tapes carrying the slats and having longitudinal parts and transverse parts, each transverse part comprising a carrying element and a supporting element between which the slat for its insertion is moved in its longitudinal direction along a slat insertion path towards and through ladder tape positions, a guiding device is used at each ladder tape position for secure insertion of each slat between the carrying and supporting elements of each transverse part of the ladder tapes, said guiding device having a guide means which is movable in the longitudinal direction of the ladder tape, when the tape is stepwise moved in its longitudinal direction, and also movable towards and away from the ladder tape along the slat insertion path and which is provided with an operating means defining together with part of the guide means a groove for the supporting element and protruding forwardly from the guide means, counted in the direction of insertion of the guide means between the carrying element and the supporting element of the ladder tape.



Inventors:
NILSSON S
Application Number:
05/347595
Publication Date:
07/23/1974
Filing Date:
04/03/1973
Assignee:
NILSSON S,SW
Primary Class:
International Classes:
E06B9/266; (IPC1-7): B23P19/04
Field of Search:
29/24.5
View Patent Images:
US Patent References:



Primary Examiner:
Juhasz, Andrew R.
Assistant Examiner:
Gilden, Leon
Attorney, Agent or Firm:
Browne, Beveridge, DeGrandi & Kline
Claims:
What I claim and desire to secure by Letters Patent is

1. In a machine for manufacturing Venetian blinds which consist of slats and ladder tapes carrying said slats and having longitudinal parts and transverse parts, the respective transverse part comprising a carrying element and a supporting element between which the slat for its insertion is moved in its longitudinal direction along a slat insertion path towards and through ladder tape positions, a guiding device which serves to guide the slat in between the carrying and supporting elements of the transverse parts of the ladder tapes, means for bringing the transverse parts successively in alignment with the slat insertion path, thereby causing the ladder tapes to move intermittently in their longitudinal direction transversely of the slat insertion path, a guide means of the guiding device being mounted for pivotal movement under and against spring action and adapted to move longitudinally of the ladder tape and also to move longitudinally of the slat insertion path towards the ladder tape in between the carrying and supporting elements thereof and away from said ladder tape, wherein the guide means of the guiding device is provided with an operation means which together with part of the guide means defines a groove for the supporting element, said operating means protruding forwardly from said guide means, in the direction of insertion of the guide means between the carrying element and the supporting element.

2. A guiding device as claimed in claim 1, wherein a guide is arranged on each side of the path of insertion of the slats and the path of movement of the guide means in order to support the respective guide means part and to fix the path of movement of the guide means part relative to the ladder tape position, said guide means parts moving between said guide and said bearing, and in the side of said guide facing the respective guide means part there is formed a groove for receiving the transverse parts of the ladder tapes, while a hollow is arranged beyond and in communication with the groove for the longitudinal parts of the ladder tape which is moved through said guide.

3. A guiding device as claimed in claim 1, wherein the guide means comprises two independent parts each arranged on one side of the path of insertion of the slats and each provided with the operating means, and a reciprocable bearing for the guide means parts, said bearing being reciprocable in the longitudinal direction of the path of insertion.

4. A guiding device as claimed in claim 3, wherein a guide is arranged on each side of the path of insertion of the slats and the path of movement of the guide means in order to support the respective guide means part and to fix the path of movement of the guide means part relative to the ladder tape position, said guide means parts moving between said guide and said bearing, and in the side of said guide facing the respective guide means part there is formed a groove for receiving the transverse parts of the ladder tapes, while a hollow is arranged beyond and in communication with the groove for the longitudinal parts of the ladder tape which is moved through said guide.

5. A guiding device as claimed in claim 1, wherein the guide means is wedge-shaped in side view, the widest portion of the wedge being arranged at or near the inner end of the groove while the point of the wege together with the operating means defines the mouth of the groove.

6. A guiding device as claimed in claim 5, wherein the guide means comprises two independent parts each arranged on one side of the path of insertion of the slats and each provided with the operating means, and a reciprocable bearing for the guide means parts, said bearing being reciprocable in the longitudinal direction of the path of insertion.

7. A guiding device as claimed in claim 5, wherein a guide is arranged on each side of the path of insertion of the slats and the path of movement of the guide means in order to support the respective guide means part and to fix the path of movement of the guide means part relative to the ladder tape position, said guide means parts moving between said guide and said bearing, and in the side of said guide facing the respective guide means part there is formed a groove for receiving the transverse parts of the ladder tapes, while a hollow is arranged beyond and in communication with the groove for the longitudinal parts of the ladder tape which is moved through said guide.

8. A guiding device as claimed in claim 7, wherein the guide means comprises two independent parts each arranged on one side of the path of insertion of the slats and each provided with the operating means, and a reciprocalbe bearing for the guide means parts, said bearing being reciprocable in the longitudinal direction of the path of insertion.

Description:
This invention relates to a guiding device for a machine for manufacturing Venetian blinds which consist of slats and ladder tapes carrying said slats and having longitudinal parts and transverse parts, the respective transverse part comprising a carrying element and a supporting element between which the slat is to be inserted. At the insertion the slat is moved in its longitudinal direction along a slat insertion path towards and through ladder tape positions and the guiding device serves to guide the slat in between the carrying and supporting elements of the transverse parts or webs of the ladder tapes. Means provided in the machine bring the transverse parts successively in alignment with the slat insertion path, thereby causing the ladder tapes to move intermittently in their longitudinal direction transversely of the slat insertion path. The guiding device has a guide means which is mounted for pivotment under and against spring action and adapted to move longitudinally of the ladder tape and also to move longitudinally of the slat insertion path towards the ladder tape in between the carrying and supporting elements thereof and away from said ladder tape.

Swedish Pat. No. 339,097 describes and shows a guiding device of the type described in the foregoing. In the prior-art guiding device the guide means which is movable towards and away from the ladder tape position engages the carrying element of the ladder tape transverse parts to guide the slat inserted between the carrying element and the supporting element during its continued insertion into the ladder tapes. The prior-art guiding device is of satisfactory function when the longitudinal parts of the ladder tape are in the form of relatively wide bands and the carrying element and the supporting element of the ladder tape transverse parts are mutually offset transversely of the ladder tape. When the longitudinal parts of the ladder tape are formed by cords which are coarser than the carrying and supporting elements which are likewise in the form of cords, the machines equipped with the prior-art guiding device sometimes fail to insert the slats between the carrying and supporting elements therefor.

To eliminate these disadvantages the guide means according to the invention is provided with an operating means which together with part of the guide means defines a groove for the supporting element and protrudes forwardly from said guide means, counted in the direction of insertion of the guide means between the carrying element and the supporting element. With such a construction of the guide means that the operating means is always inserted into the relatively large space between the ladder tape transverse parts and as a result between the consecutive pairs of carrying and supporting elements and that the operating means engages the supporting element, the guiding device will always function in a satisfactory manner, thereby permitting an increased working speed of the machine.

The invention will be more fully described hereinbelow with reference to the accompanying drawings in which:

FIG. 1 is a side elevation of part of a machine equipped with the guiding device;

FIGS. 2 to 4 are side elevation views, on a larger scale, of the guiding device, illustrating the function thereof;

FIG. 5 is a plan view of the guiding device.

The machine illustrated in FIG. 1 has a drive shaft 1 which is connected to a suitable source of power and extends through gear cases 2 in the vicinity of the ladder tape positions 3. At these positions 3 slats 4 are introduced into ladder tapes 5. An eccentric 6 and a shaft 7 are connected to the transmission formed by the gear case 2. The eccentric 6 cooperates with a slide 8. This slide has a sliding member 9 which is parallel with a slat insertion path 10 and has three arms 11 which in the transverse direction of the sliding member extend in beneath the slat insetion path 10. Said path is formed by spaced means (not shown) between which the arms 11 can move in the following manner. Each time slat 4 has been moved into the ladder tapes 5 in the machine the arms 11 by the action of the slide 8 and the eccentric 6 raise the slat 4 from the slat insertion path 10 in the direction of the arrow 12. When so raised the slat 4 moves past spring-actuated latch means (not shown) which retain the slat and a pack 13 formed by said slat and a number of other slats in raised position when the arms 11 return to the initial position illustrated. When the slats 4 are brought together in this manner to form the pack 13 the ladder tapes 5 in this pack 13 are folded, and after the requisite number of slats have been inserted said pack can be withdrawn from the machine to constitute, after completion, a finished Venetian blind. The movements for bringing together the slats 4 in the direction of the arrow 12 thus imply that the ladder tapes 5 are carried along and caused to move intermittently in their longitudinal direction (see arrow 12) transversely of the path 10 of insertion of the slat 4 and the insertion direction thereof, which is indicated by the arrow 14.

To guide the slats 4 in between a carrying element 15 and a supporting element 16 of the ladder tape transverse parts 17 and in between the longitudinal parts 18 of the ladder tape the machine has a guiding device generally designated 19. This guiding device is reciprocated, in the directions indicated by the arrows 20, by means of the shaft 7 and a cam 21 thereon, which actuates a cam follower 22 on a reciprocatory arm 24 which is guided in a guide 23. The cam follower 22 is kept engaged with the cam 21 by a spring (not shown). The arm 24 is connected with a frame 25 having a bearing 26. A guide means generally designated 27 has one end mounted in said bearing 26 so that the respective guide means 27 projects from the respective bearing 26 towards the ladder tape 5 in the ladder tape position 3. The guide means 27 is mounted for pivotment under and against the action of a spring 28 which has one end fastened in the guide means 27 and the other end anchored in the bearing 26. Rollers 29 are provided on the ends of springs 30 to resiliently bear against the slat 4 during its insertion into the ladder tape 5. When the newly inserted slat 4 is actuated by the arms 11 to be raised into application with the pack 13 of slats, the ladder tape 5 being carried along in this movement and folded, the slat 4 can snap past the rollers 29 against the action of springs 30.

The ladder tape 5 substantially depends freely from the pack 13 of slats and is extracted from a supply (not shown) when the ladder tape 5 under the action of the slats 4 raised into application with the pack 13 of slats is set into intermittent movement. To keep the ladder tape 5 stretched, two springs 31 are arranged alternately to engage the transverse parts 17. The respective spring 31 has one end connected with a fastening 32 in the machine frame 33 and the initial position of the spring 31 is fixed by means 34.

According to the invention, the guide means 27 of the guiding device 19 includes an operation means 35 which together with the guide means 27 defines a groove 36 for the supporting element 16 of the ladder tape and protrudes forwardly from the guide means 27, counted in the direction of insertion 14 thereof between the carrying element 15 and the supporting element 16. In side view the guide means 27 is in the form of a wedge, the widest portion of which is disposed at or near the inner end of the groove 36, and the point 37 of the wedge thus together with the operating means 35 defines the mouth 38 of the groove 36.

The guide means 27 preferably consists of two independent parts 27a and 27b, FIG. 5, which are disposed on either side of the slat insertion path 10 and the bearing 26 which is movable longitudinally of said path of insertion. Outside and adjacent to the path of motion of the respective parts 27a and 27b of the guide means through the ladder tape position 3 is arranged a guide 39 for the said part 27a and 27b, respectively, and the ladder tape 5. The guide 39 in its side facing the part 27a and 27b, respectively, has a groove 40 for the ladder tape transverse parts 17 and a hollow 41 beyond the groove 40 for the longitudinal parts 18 of the ladder tape 5. The guide 39 together with the bearing 26 prevents lateral movements of the guide means 27 and the ladder tapes 5 so that said guide means and said ladder tapes always occupy the correct relative positions that ensure an undisturbed assembly.

As will appear from FIG. 2 the operating means 35 of the guide means 27 has been swung by the action of the spring 28 to a position in which the operating means 35 engages the supporting element 16 of a ladder tape transverse part 17. During the movement of the ladder tape 5 in the direction of the arrow 12 (which movement is realized in that the arms 11 raise the next preceding slat 4 inserted into the ladder tape, thereby carrying along the ladder tape 5) operating means 35 and with it the guide means 27 are carried along in the direction of the arrow 12, FIG. 2. The operating means 35 and thus the guide means 27 in its entirety are moved by the drive 7, 21, 22 in the direction of the arrow 14 so that the supporting element 16 is inserted into the groove 36 through the mouth 38 thereof and so that the point 37 of the guide means 27 is moved into the space between the supporting element 16 and the carrying element 15. During insertion of the guide means 27 between the supporting element 16 and the carrying element 15 said elements are moved apart because of the wedge-shaped profile of the guide means so that said supporting and carrying elements are well separated when a new slat 4 is inserted into the ladder tape between the carrying and supporting elements thereof and between the longitudinal parts of said ladder tape, FIG. 4. Then the guide means 27 returns to the initial position illustrated in FIG. 2, whereupon the cycle is repeated.

Spreading the carrying and supporting elements 15, 16 apart tends to shorten the distance between the longitudinal parts 18 of the ladder tape, thereby rendering the insertion of the slat 4 more difficult. For a reliable function the guide means 27 must be relatively loosely mounted. To guarantee the free movements of the guide means 27 and to support them laterally and simultaneously prevent a narrowing of the space between the longitudinal parts 18 of the ladder tapes, said longitudinal parts run in the guides 39 while the guide means 27 run adjacent the guides 39, whereby the relative positions of the guide means 27 and the ladder tapes 5 are safeguarded at the moment when these parts are brought together.