Device for separating sheets in a pile

Details Device for separating sheets in a pile Device for separating sheets in a pile

1999-08-30

2001-07-31

Ellis, Christopher P. (Department: 3651)

Sheet feeding or delivering

Feeding

With means to align sheet

C271S226000, C271S236000, C271S237000

Reexamination Certificate

active

06267372

ABSTRACT:

This invention relates to an apparatus for singling sheet material such as bank notes or papers of value from a stack.
Such an apparatus is known for example from DE-OS 21 51 548. The apparatus described therein has an input pocket into which a stack of sheets is inserted. By means of a feed device at least the sheet to be picked from the stack by the picking device is transported to a picking device which then picks a sheet from the stack. To improve singling reliability the apparatus has a presingling device which first transports only a partial quantity of the stack to the picking device.
A disadvantage of the apparatus is that a stack of sheet material with different sizes or formats cannot be singled properly. In order to align one of the longitudinal edges of the sheet material on one side of the stack parallel to the transport direction for example, the operator must joggle the stack on a plane for example before inserting it into the input pocket in order to obtain the desired alignment.
NL-A 8 201 560 discloses a singling apparatus having a feed device and rollers aligned obliquely to the singling direction in order to effect a transverse component toward a lateral bearing surface and thereby align the sheet to be singled. However, as soon as this sheet is grasped by the picking device, this apparatus can no longer align the sheet. This also applies to the singling apparatus known from EP-A 21 397 wherein the sheet to be fed is pushed into the engagement area of two driven conical picking rolls by means of an imbricating roller acting perpendicular to the picking direction.
Starting out from this, the invention is based on the problem of proposing an apparatus for singling sheet material from a stack which reliably singles a stack of sheet material with different formats and different qualities.
This problem is solved by the features of the main claim.
The basic idea of the invention is substantially to provide an aligning device which transports at least the sheet to be picked from the stack by the picking device in the direction of a defined stop so that the sheet is aligned against said stop. The aligning device cooperates alternatingly with a feed device so that the feed device and the aligning device act upon the sheet to be picked from the stack at different times. Said sheet is then transported alternately in the alignment direction and the transport direction until it reaches the picking device.
The advantage of the invention is that each sheet is aligned with an edge parallel to the transport direction independently of its format and is thus located in a defined state for picking.
One preferably provides a presingling device with a pressure device which acts upon a presingled partial stack with a certain pressure. This makes it possible for the sheet to be picked by the picking device to be located in a defined state that does not depend on the number of sheets in the partial stack. Optimizing the picking device to the defined state of the sheet to be picked ensures optimal singling reliability.


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