Lithographic sheet fed press having means for clearing a jamming

Details Lithographic sheet fed press having means for clearing a jamming Lithographic sheet fed press having means for clearing a jamming

1980-10-31

1983-02-08

Coughenour, Clyde I.

Printing

Planographic

Rotary machines

101140, 101234, 101247, B41F 1328, B41F 1340

Patent

active

043722040

ABSTRACT:
A lithographic sheet fed press having means for clearing a jamming condition in which a plurality of sheets become wedged between the blanket and impression cylinders. The blanket cylinder is journaled in eccentric bushings having respective operating arms. Toggle linkages are respectively interposed between each arm and the associated frame plate and settable in a slightly overcenter operating condition for maintaining normal printing pressure between the blanket cylinder and the impression cylinder. A toggle-breaking power actuator is laterally coupled to the toggle linkages for breaking the same to the opposite side of dead center. A back-off power actuator is coupled to the bushings for imparting substantial rotation to the bushings accompanied by relief of pressure and full collapse of the toggle linkages with scissoring action. The actuators are energized in sequence to secure (a) release of the toggle linkages and (b) backing off of the blanket cylinder from the impression cylinder. The toggle linkages are re-set to their overcenter operating condition following removal of the wedged sheets. The toggle linkages are mirror images of one another and are preferably interconnected by cross shafting to keep the movements at each end of the blanket cylinder in step with one another.

REFERENCES:
patent: 1301970 (1919-04-01), Pritchard
patent: 1591127 (1926-07-01), Harrold
patent: 2578700 (1951-12-01), Harrold
patent: 2609748 (1952-09-01), Brigham
patent: 2689524 (1954-09-01), Wood
patent: 2773445 (1956-12-01), Wood
patent: 3329086 (1967-07-01), Pullen

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