Device for detecting mis-fed or missing sheets in a turning devi

Details Device for detecting mis-fed or missing sheets in a turning devi Device for detecting mis-fed or missing sheets in a turning devi

1997-12-22

1999-12-07

Bollinger, David H.

Sheet feeding or delivering

Feeding

With means to interrupt feeding

27126501, B65H 712

Patent

active

059969946

ABSTRACT:
A device for detecting mis-fed or missing sheets in a printing press having a storage drum includes a plurality of holding suction devices disposed on the storage drum and connected fluidically with one another via a first connecting line, a plurality of detecting suction devices disposed on the storage drum and connected fluidically with one another via a second connecting line, the holding suction devices and the detecting suction devices being formed with respective suction openings coverable at least partly by a sheet properly fed thereto, and a pressure monitoring device fluidically connected to the second connecting line for controlling the operation of the printing press in accordance with pressure prevailing in the second connecting line, the holding suction devices and the detecting suction devices being formed primarily of suction devices of the same type, the second connecting line having a cross section smaller than that of the first connecting line, and being connected fluidically with the first connecting line, and the first connecting line being connected fluidically with a negative pressure source.

REFERENCES:
patent: 4127265 (1978-11-01), Wirz et al.

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