Lock-up assembly for plate cylinders of rotary presses

Details Lock-up assembly for plate cylinders of rotary presses Lock-up assembly for plate cylinders of rotary presses

1998-09-22

2000-02-22

Yan, Ren

Printing

Flexible-sheet-securing devices

B41F 2712

Patent

active

060267461

ABSTRACT:
In offset presses in which the printing cylinder is provided with a tensioning spindle or reel rod the printing plate usually has a hooked edge which is inserted in a gap in the printing cylinder. The printing plate is then wrapped around the plate cylinder for insertion in the spindle within the plate cylinder. The tensioning spindle carries a slot for receiving an end of the printing plate. After insertion of the plate end in this receiving slot partial rotation of the spindle tightens the printing plate. A substantial amount of skill is required to fix a printing plate on a printing cylinder. It is not easy to align the gap in the printing cylinder with the slot in the tensioning spindle. Two hands are usually required. Herein the tensioning spindle end shaft carries a pinion capable of moving a rack associated with it when the tensioning spindle is partially rotated. A spring is installed to oppose the rack movement. A ratchet mechanism is provided to hold the tensioning spindle in place after the slot and gap are aligned. The edge of the printing plate can readily be inserted in the tensioning spindle receiving slot. A ratchet release means permits the spring, through the rack, to rotate the tensioning spindle to lock the printing plate in place under a tensioned condition from either end of the printing cylinder.

REFERENCES:
patent: 1644218 (1927-10-01), Wright
patent: 1937119 (1933-11-01), Kranz
patent: 2285116 (1942-06-01), Grupe
patent: 2409536 (1946-10-01), Braunworth
patent: 2953090 (1960-09-01), Scott
patent: 3008410 (1961-11-01), Bryer
patent: 3757690 (1973-09-01), Skiera et al.
patent: 4476783 (1984-10-01), Tsukasaki
patent: 4688473 (1987-08-01), Eriksson
patent: 4688483 (1987-08-01), Schollenberger
patent: 4688484 (1987-08-01), Herold et al.
patent: 4951568 (1990-08-01), Tsukamoto et al.
patent: 5178068 (1993-01-01), Junghans et al.
patent: 5315931 (1994-05-01), Doersam
patent: 5402722 (1995-04-01), Schneider et al.
patent: 5413042 (1995-05-01), Weiss et al.
patent: 5461981 (1995-10-01), Schneider
patent: 5503072 (1996-04-01), Schneider

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