Unwind stand-roll brake

Details Unwind stand-roll brake Unwind stand-roll brake

1978-10-25

1979-12-04

Hornsby, Harvey C.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

188 74, 188195, B65H 2306

Patent

active

041768051

ABSTRACT:
A braking system for applying a controllable braking force to the support shaft of a film supply roll, wherein the braking force is proportional to the weight of film remaining upon the supply roll, and wherein the braking force decreases as the supply of film remaining on the supply roll decreases. The system utilizes a pair of brake yokes which are mounted on opposed sides of the frame of an unwind stand, with each brake yoke having a generally "U" configuration, and with the support shaft for the film supply roll being received within the "U" shaped member. The yokes are mounted upon rams which are controllably elevated, and when elevated, a friction pad which lines the inner periphery of the yoke makes contact with the support shaft. The rams are arranged to reciprocatorily raise and lower the yokes for bringing the friction material into and out of contact with the support shaft so as to provide controlled braking when required. The braking system of the present invention is employed during periods of temporary shut-down of the apparatus, and is normally not employed to establish a running tension in the film web during normal machine operation.

REFERENCES:
patent: 1270279 (1918-06-01), Ferres
patent: 2285939 (1942-06-01), Neumair
patent: 2877963 (1959-03-01), Hayden

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