Printing – Rolling contact machines – Rotary
Patent
1992-04-13
1993-01-05
Fisher, J. Reed
Printing
Rolling contact machines
Rotary
101410, B41F 2105, B65H 912
Patent
active
051760797
ABSTRACT:
Device for correcting the register of a sheet-overprint and for compensating for a distorted sheet in a sheet-fed rotary printing machine by deforming the leading edge of the sheet on a travel path thereof before the leading edge enters a printing unit, including an adjustable bending device for bending, in rhythm with a printing cycle of the machine, a support beam extending transversely to the travel path of the sheet and carrying a plurality of mutually adjacent sheet grippers, includes a pregripper device for executing swinging movements about a stationary axis and an axis adjustable into a given position, respectively, the pregripper device including a gripper fly forming the support beam for the sheet grippers, and respective rigid levers supporting the gripper fly at least at both ends thereof on a gripper-fly shaft, the bending device being cooperatively engageable with the pergripper device and being formed of a single adjustable deforming stop disposed substantially midway between the respective ends of the gripper fly and fixed to a frame of the machine, the bending device and theh pregripper device, except for the sheet gripper thereof, being located below the sheet travel path, the gripper fly, at a substantially midwise location thereof between the levers, being deformably engageable with the single adjustable deforming stop before the ends of the gripper fly, during a return swing thereof, have reached a zero setting in which the sheet grippers take over a sheet.
REFERENCES:
patent: 2577099 (1951-12-01), Albrecht
patent: 3623721 (1971-11-01), Smith
patent: 3682472 (1972-08-01), Barthel
patent: 3833213 (1974-09-01), Smith
patent: 4466350 (1984-08-01), Schilling
Fisher J. Reed
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Lerner Herbert L.
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