Method and apparatus for rapidly separating the rolls of a calen

Presses – Automatic or material triggered control – Of roll separation or speed

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Details

100163A, 100170, B30B 304, B30B 1516

Patent

active

042903513

ABSTRACT:
The lowermost roll of a row of superimposed rolls in the stand of a calender is movable downwardly at a continuously increasing speed through a first distance which suffices to increase the width of clearances between neighboring rolls in the event of breakage of the running web so that the rolls cannot damage each other, and thereupon through a second distance which is at least 50 percent of the first distance. The lowermost roll is braked only during movement through the second distance so that the first distance can be covered, under the action of gravity alone or under the action of gravity plus the action of several double-acting hydraulic cylinders, within a fraction of the time which is required for adequate separation of rolls in a calendar wherein the lowermost roll must be braked during travel through the first distance. The speed of the lowermost roll during movement through the second distance is regulated by flow restrictors which are installed in conduits for evacuation of liquid from the lower chambers of the double-acting cylinders and which are adjustable by a control unit in accordance with a preselected pattern as a function of time and/or as a function of the extent of downward movement of the lowermost roll. The uppermost roll is hydraulically locked against any movement during downward movement of the lowermost roll.

REFERENCES:
patent: 3364848 (1968-01-01), Muller
patent: 3369483 (1968-02-01), Muller
patent: 3777656 (1973-12-01), Muller
patent: 3884140 (1975-05-01), Christ et al.
patent: 3942434 (1976-03-01), Wenzel
patent: 3948166 (1976-04-01), Wenzel

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