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1. (WO1992009512) SHEET-FILM REMOVAL DEVICE
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Patent Claims

Device for removing a sheet film from a cassette with a suction means, said device bending the area of the sheet, which has been attracted by said suction means, towards the sheet plane in order to release the sheet to be removed, c h a r a c t e r i z e d in that

- the suction means (11, 22) is movable to and fro on a positively guided carriage (9, 10) ,
- the carriage (9, 10) is guided on two parallely arranged plates (1, 2) each having a first and a second guide slot (la, lb, 2a, 2b) arranged symmetrically and at a distance from each other,
- the first and second guide slots (la, lb, 2a, 2b) each comprise straight sections (Id, le, 2f, 2h) which point in the same direction, are arranged side by side and are inclined at an angle towards the open cassette (27) ,
- the second guide slots (lb, 2b) face cassette (27) and in their end areas adjacent to cassette (27) comprise sections (lg, 2i) which are bent off downwardly,
- in the area of the carriage (9, 10) guided in the second guide slot

(lb, 2b) , one end of a bar (3, 4) is hingedly attached whose other end is hinged to a motor-driven toothed belt (7, 8) mounted on plate (1, 2) , and
- the carriage (9, 10) consists of a guide member (9) received in the guide slots (la, lb, 2a, 2b) and a carrier (10) which is arranged on said guide member and mounted so as to be shif table, pivotable and tiltable relative to guide member (9) , with the suction means (11, 22) pivotably mounted on said carrier.

Device according to claim 1, characterized in that the toothed belt (7, 8) is guided on two gear wheels (16, 30) mounted above the first and second guide slots (la, lb, 2a, 2b) such that the toothed belt (7, 8) and the straight sections (le, 2h) of the second guide slots (lb, 2b) assume an angular position to each other which is open towards cassette (27) .

3. Device according to claim 1 or 2 , characterized in that the carrier (10) is mounted by means of a front and a rear pin-and-slot connection on guide member (9) so as to be shif table in the direction of movement of carriage (9, 10) and comprises at its front end facing cassette (27) fork-shaped bent-off portions (10b, 10c) on which a suction plate (11) with suction elements (22) is mounted for pivotal movement about journals (23, 24) .

4. Device according to claim 3 , characterized in that the carrier (10) is mounted so as to be tiltable and shiftable at its rear pin-and-slot connection on a step (9b) of a pin of the guide member (9) designed as a stepped bolt (9a) .

5. Device according to one or several of claims 1 to 4, characterized in that the guide member (9) comprises two arms (9c) which extend between the suction plate (11) and the carrier (10) and limit the pivotal movement of carrier (10) .

6. Device according to one or several of claims 1 to 5 , characterized in that on the lower side of carrier (10) , an electromagnet (19) is arranged to the spring-biased armature (25) of which an actuating member (21) is hinged which is positively guided on carrier (10) and held in engagement with suction plate (11) .

7. Device according to claim 6 , characterized in that a switch (26) of a function control device is arranged on carrier (10) and located in the path of movement of the actuating member (21, 21a) .

8. Device according to claim 6 or 7 , characterized in that the actuating member (21) is held in engagement with the armature (25) of electromagnet (19) by means of a pin-and-slot connection (20, 32 , 32a) which allows a relative movement of suction plate (11) .

9. Device according to one or several of claims 3 , 6 and 8 , characterized in that the suction plate (11, 22) is arranged in an offset position on journals (23 , 24) such that it is biased to an end position under the influence of its own weight.

10. Device according to one or several of claims 1 to 9, characterized in that the carrier (10) comprises an arm (lOd) at its rear end opposite to its front end, a stationary abutment being arranged in the path of movement of said arm and causing the carrier (10) to pivot about stepped bolt (9a) which serves as a journal.

11. Device according to one or several of claims 1 to 10, characterized in that the guide member (9) is guided in the guide slots (la, lb, 2a, 2b) by means of guide rollers (12, 13) supported on ball bearings.

12. Device according to one or several of claims 1 to 11, characterized in that the carriage (9, 10) is driven by two symmetrically arranged toothed belts (7, 8) , drivers (5, 6) and bars (3, 4) and in that the gear wheel (16) is rigidly connected with the gear wheel driving the second toothed belt (8) via a driving shaft (17) .

13. Device according to one or several of claims 1 to 12, characterized in that the plates (1, 2) are screwed together by spacer bolts (18) to form an assembly group.

14. Device according to claim 13, characterized in that the plates (1, 2) have recesses (Ih, li, lj, 2j, 2k, 2m) at their lower sides, which allow the assembly group to be pre-ahgned in the proper orientation and in positive engagement with the relevant parts.

15. Device according to claim 13 or 14, characterized in that the plates (1, 2) have positioning holes (lc, If, 2d, 2e) which allow the assembly group to be positively and accurately fixed in position.