Sheet transfer system for a printing machine

Details Sheet transfer system for a printing machine Sheet transfer system for a printing machine

1975-03-25

1976-11-23

Crowder, Clifford D.

Printing

Work supporting members

Grippers

101232, 271 82, B41F 2106

Patent

active

039929930

ABSTRACT:
A printing machine has an upstream and a downstream printing station each provided with a printing roller. A sheet transfer roller is located between the stations for transferring sheets from the printing roller of the upstream station to that of the downstream station; it defines a tangent point with the printing roller of the upstream station. A first and a second mechanical gripper system are mounted on the transfer roller for swinging movement towards and away from one another. A suction gripper system is also provided on the transfer roller for engaging a trailing edge portion of a sheet on the periphery of the printing roller of the upsteam station, prior to arrival of the trailing edge of the sheet at the tangent point, and for lifting the trailing portion off the periphery. A drive is provided for effecting movement of the suction gripper system subsequent to engagement of the trailing edge portion of the sheet in a trochoidal path to a position at which the trailing edge portion is engaged by the first mechanical gripper system in preparation for transfer to the second mechanical gripper system, without the movement causing any relative displacement between the remainder of the sheet and the periphery.

REFERENCES:
patent: 2092189 (1937-09-01), Stobb
patent: 2699941 (1955-01-01), Huck et al.
patent: 3116923 (1964-01-01), Gunther
patent: 3455547 (1969-07-01), Rudolph et al.
patent: 3463484 (1969-08-01), Rudolph
patent: 3537391 (1970-11-01), Mowery et al.
patent: 3788639 (1974-01-01), Bru
patent: 3796154 (1974-03-01), Weisgerber
patent: 3865362 (1975-02-01), Luffy et al.

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