Material or article handling – Apparatus for moving intersupporting articles into – within,... – Stack forming apparatus
Patent
1995-07-19
1998-03-17
Merritt, Karen B.
Material or article handling
Apparatus for moving intersupporting articles into, within,...
Stack forming apparatus
271220, 271274, B65H 3140
Patent
active
057279233
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention pertains to a collecting device for sheets to form stacks of sheets, with a removing device.
BACKGROUND OF THE INVENTION
Such a collecting device has been known from practice. It is used to form stacks of sheets from individual sheets fed in. After completion of the stacking job, the stack of sheets is removed with the removing device. The prior-art removing device consists of two rollers, which also form the stop for the stack of sheets with their wedge. The rollers are driven intermittently, and they pull off the stack from the delivery area. This arrangement has the disadvantage that the roller wedge does not offer a clean stop surface. The rollers also must have a certain minimum size to be able to grip and remove the stack of sheets. It is also unfavorable that the roller drive must be switched on and off intermittently.
On the other hand, it has been known that individual sheets can be pushed over a ramp and be allowed to slide or fall onto the stack of sheets located lower. The sheets are driven by rollers only in the ramp area, and they are pushed onto the stack of sheets. This technique requires relatively high rigidity of the sheet. Furthermore, it is also suitable only for placing the sheets on a stack on one side only. In addition, a change in format requires a considerable effort in terms of conversion.
SUMMARY AND OBJECTS OF THE INVENTION
It is an object of the present invention to provide a removing device with a higher reliability of operation.
Another object of the present invention is to provide a collecting device with reliable sheet guidance and optionally selectable delivery of the sheets on the stack.
The removing device according to the present invention provides a separate stop, which is movable and can be removed to remove the stack of sheets. The stop, which is preferably designed as a pivotably driven plate, ensures better alignment of the stack of sheets, which can also be gripped better and more securely as a result. A driven roller arrangement, which can be fed to the stacks of sheets, is provided for the transportation of the stack of sheets. It is out of operation during the stacking job, and it is brought into conveying contact with the finished stack of sheets only for the removal of the finished stack of sheets. The roller arrangement itself has no stop function any more, and it no longer has to grip the stack of sheets at the front edge of the sheet. It can be positioned somewhat farther away from the edge in the area of the stacking surface, as a result of which it grips the stack of sheets better and more securely. Due to the possibility of feeding the roller arrangement, the latter does not hinder the stacking job, which can take place trouble-free and at a high reliability of operation as a result.
Three rollers are preferably provided; two of them clamp the stack of sheets between them and are then driven by a third drive roller. As a result, it is possible to uncouple the gripping and clamping movement of the stack of sheets from the transport movement, and to allow the two processes to take place one after the other. This improves the reliability of operation during the gripping and guiding of the stack of sheets, which can no longer fan out during the pulling off.
A single actuating device, which removes the stop and feeds and puts into operation the individual rollers, is provided for the removing device. It is possible in the arrangement according to the present invention to provide a continuously rotating drive roller and to bring about the intermittent delivery operation by cyclically feeding the roller. This technique is more efficient in terms of control and mechanics. The reliability of operation, as well as the service life and consequently the economy increase compared with the prior art.
Various design possibilities are available for the arrangement of the rollers and of the stop and their feeding movement. In the preferred embodiment, the lower pressure roller is coupled with the stop. The stop is arr
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Bowe Systec AG
Merritt Karen B.
Morse Gregory A.
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