Process and device for braking sheets, in particular sheets...

B - Operations – Transporting – 65 – H

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B65H 29/68 (2006.01) B65H 29/66 (2006.01)

Patent

CA 2046613

- 24 - 21712-233 Abstract: Method and apparatus for decelerating sheets, particularly sheets of paper or board, to be deposited on a stack To decelerate sheets transported on conveyors at a dis- tance from one another so that they can be stacked without diffi- culty, it is known to use elements that engage in the region of the rear edges of the sheets. At very high operating speeds, the sheets can thereby turn on edge and unwanted markings can occur, particularly on delicate papers. To avoid this, the sheets (8) are decelerated by clamp- ing them between clamping elements (28, 33, 34) with synchronously rotating clamping zones which are temporarily applied to the sheets (8) during one rotation, whereby - the clamping zones have the inlet speed of the sheets (8) when applied to the sheets, - the speed of the clamping zones is subsequently reduced so slowly to the desired delivery speed of the sheets (8) that the frictional engagement with the sheets (8) is maintained, - the sheets (8) are thereafter unclamped, and - the clamping zones are moved out of the inlet plane before the following sheets (8) arrive, and - are accelerated again to the inlet speed before the following sheets (8) are clamped. (Figure 5)

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