Title: Sheet-turning drum for printing machines convertible from printing on one side of a sheet to printing on both sides of a sheet and vice versa

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.

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Inventors: Schilling, Paul (Neckargemund, DE, US)

Application Number: 734674
Filing Date: 1976-10-21
Publication_date: 1979-01-09
Assignee: Heidelberger Druckmaschinen AG (Heidelberg, DE1)
Primary Class(es): 101/409 101/232, 271/277
Other Classes:
US Patent Ref:

2619903	Dec, 1952	Albrecht	101/409.
3362327	Jan, 1968	Luehrs	101/415.
3385597	May, 1968	Guzik	101/411.
3899970	Aug, 1975	Jurny et al.	101/230.
3929069	Dec, 1975	Jahn	271/277.
4026209	May, 1977	Wirz et al.	101/232.

Other Refs:
Primary Examiner: Pieprz, William
Assistant Examiner:
Attorney: Lerner; Herbert L.