Spring-biased suction transfer actuation system for a multi-colo

Details Spring-biased suction transfer actuation system for a multi-colo Spring-biased suction transfer actuation system for a multi-colo

1991-04-19

1992-09-01

Burr, Edgar S.

Printing

Work supporting members

Grippers

101410, 1014151, B41F 130

Patent

active

051429837

ABSTRACT:
A suction transfer actuation system for a transfer drum of a multi-color sheet-fed rotary printing press for turning successive sheets, by rear-edge turning, during the sheet transfer from one printing unit to another to facilitate printing on the back side of the sheets. A plurality of suction arms are rigidly connected to a hollow suction rocker shaft connected to actuating levers carrying a pair of guide rollers engaging a curved outer guide cam surface on a guide bar mounted on the transfer drum. The suction actuation system is driven by way of a cam rigidly mounted on the press frame engaged by a cam follower roller to oscillate a drive lever coupled by a link to a drive arm on the rocker shaft to rock the suction arms toward and away from the one printing unit under the guiding influence of the guide cam and guide rollers. A pair of compression springs disposed substantially at right-angles to one another and radially with respect to the rocker shaft bias the guide rollers against the outer guide cam surface. One end of each compression spring is articulated on the actuating lever and the other end is supported by and bears against the body of the sheet transfer drum.

REFERENCES:
patent: 2080249 (1937-05-01), Barber
patent: 3937142 (1976-02-01), Cerny et al.
patent: 3992993 (1976-11-01), Kuhn et al.
patent: 4029009 (1977-06-01), Kuhn et al.
patent: 4132403 (1979-01-01), Weisbach et al.
patent: 4864929 (1989-12-01), Simeth
patent: 5029524 (1991-07-01), Wirz et al.

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