Gripper control for a cyclically rockingly driven pregripper for

Details Gripper control for a cyclically rockingly driven pregripper for Gripper control for a cyclically rockingly driven pregripper for

1996-11-21

1998-05-12

Skaggs, H. Grant

Sheet feeding or delivering

Feeding

By means to convey sheet

271277, 271 85, 101409, 101410, B65H 512

Patent

active

057495726

ABSTRACT:
Gripper control for a cyclically rockingly driven pregripper for single-sheet feeding in a sheet-fed printing press, the pregripper being disposed at a free end of a rocker lever, which is swivelable about a rocker shaft fixed to a frame of the printing press, and having at least one sheet gripper forcibly movable by cams about an articulated shaft disposed parallel to the rocker shaft, for closing and opening the sheet gripper when the sheet is taken over and transferred, respectively, one of the cams being revolvable a single revolution, and another of the cams being disposed on a locally stationarily swivelable roller lever carrying a cam roller engaging with the one cam, the other cam being swivelable cyclically in the position thereof, the position of the cams determining the closing time and opening time of the gripper, includes an indexing mechanism for fixing the other cam on the locally stationarily swivelable roller lever, the other cam having a first gripper-closing cam region and a first gripper-opening cam region, the first gripper-closing cam region having a second gripper-opening cam region, the one cam revolvable a single revolution having a second gripper-closing cam region operatively associated with the second gripper-opening cam region for compensation.

REFERENCES:
patent: 5343806 (1994-09-01), Fricke et al.
patent: 5398607 (1995-03-01), Fricke et al.
patent: 5440983 (1995-08-01), Dopke et al.
patent: 5562035 (1996-10-01), Pollich et al.
patent: 5570635 (1996-11-01), Stadler

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