Valmet-strecker Gmbh

Erwin Trenzen

The present invention provides a sheet stacking device capable of being easily adjusted to accomodate sheets of different format sizes. The device presents an automatically lowerable lift table, and in the zone of the upper stack end a face-side sheet feed, a plurality of endless, driven sheet guide bands extending over the stack, and several longitudinally running lateral boundary plates. Even despite liberal adjustment of the format width, faultless guidance of the fed-in sheets may be achieved by the provision of a large number of sheet guide bands at normally equal intervals over the entire possible stack width. At least individual ones of the boundary plates are liftable out over two sets of sheet feed bands, and movable laterally independently of the bands. Bands standing in the way of boundary plates being driven laterally to their end position, are also drivable through a limited lateral interval. In this instance, the bands standing in the way of the boundary plates concerned, or their support, can be laterally conducted along as well. The adjustment procedure can be controlled in dependence on a presettable format width by microprocessor.

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Seeheim-Jugenheim, Germany

Erwin Trenzen