Lock-up assembly for securing a printing plate on a plate cylind

Details Lock-up assembly for securing a printing plate on a plate cylind Lock-up assembly for securing a printing plate on a plate cylind

1994-02-22

1995-05-09

Burr, Edgar S.

Printing

Flexible-sheet-securing devices

1013821, 101383, 101378, 101411, B41F 2706, B41F 2712

Patent

active

054130425

ABSTRACT:
A lock-up assembly (20) for securing a printing plate (22) on a plate cylinder (10) includes a rotatable lock bar (32) and a spring biased linkage mechanism (36). The linkage mechanism (36) has a first over-center condition in which it rotates the lock bar (32) toward a locked position, and has a second over-center condition in which it rotates the lock bar (32) toward an unlocked position. A movable blocking member (82) blocks the linkage mechanism (36) from switching to the second over-center condition under the influence of centrifugal force when the cylinder (10) is rotating during a printing operation. A hand held tool (40) engages the linkage mechanism (36) to switch it between the first and second over-center conditions upon manual manipulation of the tool (40). The tool (40) also engages the blocking member (82) to move the blocking member (82) from the first position to the second position when the tool (40) is moved into engagement with the linkage mechanism ( 36).

REFERENCES:
patent: 3335663 (1967-08-01), Harenza
patent: 3410211 (1968-11-01), Grunig
patent: 3727551 (1973-04-01), Kostas et al.
patent: 4223604 (1980-09-01), Brehm et al.
patent: 4641576 (1987-02-01), Guthling et al.
patent: 4862801 (1989-09-01), Marmin
patent: 4893561 (1990-01-01), Grosshauser et al.
patent: 5123353 (1992-06-01), Beck
patent: 5359933 (1994-11-01), Blaser et al.

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