Swivellable pre-gripper of a sheet-fed printing press and method

Details Swivellable pre-gripper of a sheet-fed printing press and method Swivellable pre-gripper of a sheet-fed printing press and method

1993-09-10

1994-09-06

Eickholt, Eugene H.

Printing

Work supporting members

Grippers

101409, 101410, 101411, 271277, B41F 130

Patent

active

053438060

ABSTRACT:
Swivelling pre-gripper of a sheet-fed printing press having a sheet feeding table includes a swivel arm; a gripper carried by the swivel arm; a mutually cooperating roller lever and cam mechanism for, respectively, opening and closing the gripper; a device for cyclically swivelling the swivel arm of the pre-gripper to and away from the sheet feeding table; a device for cyclically opening and closing the gripper; a device for setting an instant of opening of the gripper for releasing a sheet gripped by the gripper in a closed condition thereof to a downline conveying device for accepting and transporting the released sheet; a device for setting, in a manner decoupled from the setting of the instant of opening, an instant of closing the gripper for gripping the sheet fed from the feeding table to the pre-gripper; one of the devices for setting the instant of opening and for setting the instant of closing of the gripper being disposed on the roller lever; and the other of the devices for setting the instant of closing and for setting the instant of opening of the gripper forming part of the cam mechanism for, respectively, opening and closing the gripper; and method for setting gripper opening and closing instants of the pre-gripper.

REFERENCES:
patent: 1709812 (1929-04-01), Weide
patent: 1874013 (1932-08-01), Kaddelawd
patent: 2004812 (1935-06-01), Johnson
patent: 3463484 (1969-08-01), Rudolph
patent: 4210079 (1980-07-01), Raes
patent: 4370928 (1983-02-01), Weisbach et al.
patent: 4759290 (1988-07-01), Holl et al.
patent: 5076165 (1991-12-01), Pollich

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