Device and method for detecting and gripping sheets

Details Device and method for detecting and gripping sheets Device and method for detecting and gripping sheets

1993-06-28

1995-02-21

Skaggs, H. Grant

Sheet feeding or delivering

Feeding

With means to align sheet

271265, 271268, B65H 904

Patent

active

053909089

ABSTRACT:
A measurement device for detecting the presence of a sheet is disclosed. A paper sheet processing machine has front lays with stop surfaces at which the leading edges of paper sheets are aligned. The paper sheets are accelerated by pre-grippers to a speed sufficient for transferring the paper sheets to a paper sheet processing unit, such as a transfer drum in a sheet-fed rotary offset printing machine. The measurement device comprises upper and lower sensor members between which a gap is defined. The leading edges of sheets which are aligned at the front lays are disposed within the gap. The upper and lower sensor members forming upper and lower boundaries, respectively, of a scanning region which is defined vertically relative to the plane of the paper sheet. Paper sheets which cross the scanning region between the sensor members and which are aligned along the stop surfaces of the front lays are detected. A method and a corresponding pre-gripper assembly are disclosed as well.

REFERENCES:
patent: 1984588 (1934-12-01), Liebusch
patent: 2926909 (1960-03-01), Jantzen
patent: 3169476 (1965-02-01), Fielding
patent: 3190645 (1965-06-01), Reinartz
patent: 3335662 (1967-08-01), Ritzerfeld
patent: 3948170 (1976-04-01), Ericsson
patent: 4354673 (1982-10-01), Kuroda
patent: 4782755 (1988-11-01), Grua
patent: 5231927 (1993-08-01), Pfisterer et al.
patent: 5267728 (1993-12-01), Simeth

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