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Delivery and ejection device for flat elements into a machine working them

Imported: 24 Feb '17 | Published: 06 Jan '04

Oskar Dittli, Pierre Robadey, Michel Mermet

USPTO - Utility Patents

Abstract

A device for stacking sheets delivered on a first conveyor in a plurality of parallel streams of overlapping sheets, includes a second conveyor moving slower than the first conveyor that compacts the streams as they exit the first conveyor; a third conveyor that receives the streams from the second conveyor; and a plurality of stackers, each aligned with one of the streams exiting the third conveyor, formed of endless belts positionable horizontally which cooperate with stop members to stack the incoming sheets. Completed stacks are then moved downstream on the belt. When sheets in a stream are determined to be defective; its belt for that stream is tilted, and the stream falls onto a fourth conveyor for disposal. A spacer introduces spacing into each stream to delineate portions of the streams which will form successive stacks, includes adjusting devices that lengthen and shorten the second and third conveyors, and a device selectively operable to stop passage of the streams from the second conveyor to the third conveyor. The adjusting devices are coupled to simultaneously lengthen one of the conveyors and to shorten the other conveyor. A drive mechanism for the third conveyor moves the third conveyor at the same speed as the second conveyor receiving the streams from the second conveyor, and faster than the second conveyor when delineated portions of the streams are being delivered to the stackers.

Description

The invention will be more readily understood from one embodiment without limiting force and illustrated in the accompanying figures wherein

FIG. 1 represents a schematic front view of the device according to the invention in a first situation,

FIG. 2 represents a simplified schematic plan view of the device as shown on FIG. 1,

FIG. 3 represents a schematic front view of the device according to the invention in a second situation,

FIG. 4 represents a schematic sectional view, according to the line IV—IV of FIG. 1, of a part of the driving mechanism of the device according to the invention,

FIG. 5 represents the downstream part of the device of the invention in a different situation than the one illustrated on FIGS. 1 and 3,

FIG. 6 represents a partial sectional profile view, according to the line VI—VI of FIG. 7, of an output ramp of piles of sheets,

FIG. 7 represents a detailed partial sectional view of the output track illustrated on FIG.

6.

Claims

1. A delivery and ejection device for receiving flat elements from a production machine which produces a plurality of parallel streams of flat elements exiting the machine on a first conveyor moving at a first speed, with the elements in each stream arranged in an overlapping, shingled configuration, the device comprising:

2. A device according to claim 1, wherein:

3. A device according to claim 2, wherein the stream interrupting mechanism includes:

4. A device according to claim 3, wherein the second ones of the first and second pluralities of idlers are mounted on the first carriage, and the third ones of the first and second pluralities of idlers are mounted on the second carriage.

5. A device according to claim 4, wherein the idlers which are mounted on the second carriage are independently movable relative to the carriage along the axis of movement thereof.

6. A device according to claim 3, wherein the actuator for the first and second carriages includes:

7. A device according to claim 3, wherein the gripping devices are respectively comprised of:

8. A device according to claim 7, wherein the pressure elements are mounted on the first carriages.

9. A device according to claim 7, wherein the pressure elements are located below the respective streams, and the reaction elements are vertically aligned with the pressure elements above the respective streams.

10. A device according to claim 1, wherein the gripping devices are respectively comprised of:

11. A device according to claim 10, wherein the pressure elements are located below the respective streams, and the reaction elements are vertically aligned with the pressure elements above the respective streams.

12. A device according to claim 1, wherein each of the stack-forming assemblies is comprised of a surface which is positioned horizontally in the first configuration to receive the elements exiting the third conveyor thereby to form a stack on the surface, and is positioned sufficiently away from horizontal in the second configuration that the elements exiting the third conveyor fall to the fourth conveyor without contacting the surface.

13. A device according to claim 12, wherein each of the stack-forming assemblies is comprised of an endless belt which defines the surface, and which is selectively movable in the downstream direction to eject the stack.

14. A device according to claim 13, wherein each stack-forming assembly is further comprised of:

15. A device according to claim 1, wherein the stack-forming assemblies respectively include jogging devices in the paths of the respective streams exiting the third conveyor, the jogging devices being operative to arrange the flat elements into piles, the jogging devices being comprised of:

16. A device according to claim 15, wherein:

17. A device according to claim 16, wherein the jogging devices and a roller defining the downstream end of the third conveyor are coupled together for simultaneous vertical movement upwards while following the height progression of the stacks on the stack forming assemblies, and for vertical movement downwards while stacks are being ejected.

18. A device according to claim 16, wherein the jogging devices are each equipped with a nozzle operative to provide an air blast toward the front stop members at a height below the plane of the carrying surface of the third conveyor belt.

19. A device according to claim 18, wherein the strength of the air blasts, their amount, their position and the orientation of the nozzles constitute adjustable parameters, selected according to the size and weight of the flat elements.