Pregripper in a sheet-fed printing machine

Details Pregripper in a sheet-fed printing machine Pregripper in a sheet-fed printing machine

1993-10-08

1995-03-21

Eickholt, Eugene H.

Printing

Work supporting members

Grippers

271277, 1014151, B41F 204

Patent

active

053986075

ABSTRACT:
A pregripper configuration in a sheet-fed rotary printing press feeds single sheets to a rotating cylinder. A cam drive includes a main cam and a roller lever which pivots about a frame-fixed shaft. A lever mechanism, which is articulated to the roller lever and a pregripper pivot arm, transmits the motion of the cam-following roller lever to the pivot arm. The pivot arm is also pivoted about a frame-fixed shaft. In order to compensate for play in the lever mechanism, a pretensioned spring is disposed between an attachment point on the roller lever and an attachment point on the pivot arm. In one embodiment, the pretensioned spring extends approximately parallel to a rigid link connected in articulated fashion between the roller lever and the pivot arm. In another embodiment, the spring is attached to a compensating cam drive.

REFERENCES:
patent: 3116923 (1964-01-01), Gunther
patent: 4295422 (1981-10-01), Thunker
patent: 4372209 (1983-02-01), Jentzsch et al.
patent: 4730557 (1988-03-01), Wieland
patent: 4854236 (1989-08-01), Thunker et al.
patent: 4862801 (1989-09-01), Marmin
patent: 4905985 (1990-03-01), Nagatani
patent: 4993275 (1991-02-01), Pollich et al.
patent: 5076165 (1991-12-01), Pollich

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