Sheet-turning drum for printing machines convertible from printi

Details Sheet-turning drum for printing machines convertible from printi Sheet-turning drum for printing machines convertible from printi

1976-10-21

1979-01-09

Pieprz, William

Printing

Work supporting members

Grippers

101232, 271277, B41F 2104

Patent

active

041332636

ABSTRACT:
A sheet-turning drum assembly for printing machines convertible from printing on one side of a sheet to printing on both sides of a sheet and from printing on both sides of a sheet to printing on one side of a sheet includes a drum and tongs-type grippers pivotally mounted on the drum and including a pair of tongs-type gripper halves. Separate drive members are operatively connected to the respective tongs-type gripper halves for controllably pivoting each of the tongs-type gripper halves, and a torsion bar spring is disposed between the separate drive members for mutually bracing the latter resiliently against one another.

REFERENCES:
patent: 2619903 (1952-12-01), Albrecht
patent: 3362327 (1968-01-01), Luehrs
patent: 3385597 (1968-05-01), Guzik
patent: 3899970 (1975-08-01), Jurny et al.
patent: 3929069 (1975-12-01), Jahn
patent: 4026209 (1977-05-01), Wirz et al.

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