Constant force roll assembly

Details Constant force roll assembly Constant force roll assembly

1983-10-26

1986-08-12

Stoner, Jr., Bruce H.

Sheet feeding or delivering

Feeding

With means to align sheet

271251, 271274, 267177, B65H 916

Patent

active

046052186

ABSTRACT:
A mounting mechanism for the backup roll of a roll pair wherein a four bar linkage is provided. The backup roll is mounted at one end of a first arm and bears against a mating roll positioned in a stationary location. The first arm extends to a pivot point around which the backup roll rotates to engage the mating roll. A second arm is rigidly connected to the first arm at the pivot point and extends to an end point. A third arm, comprised of a coil spring with a coupler threaded thereto, extends from the end point of the second arm to a stationary point. The fourth arm of the four bar linkage is the ground extending between the stationary points to which the first and third arms are attached. By adjusting the coupler, the number of active coils in the third arm is adjusted thereby adjusting the normal force between rolls to a desired value. By providing the first arm with substantially more length than the second arm, the normal force between rolls is maintained relatively constant over a wide tolerance in the stationary location of the mating roll.

REFERENCES:
patent: 973641 (1910-10-01), Dysart
patent: 1788373 (1931-01-01), Anderson
patent: 3021134 (1962-02-01), Appell
patent: 3067999 (1962-12-01), Skeen
patent: 3072397 (1963-01-01), Kelchner
patent: 3155109 (1964-11-01), Anthon
patent: 3351255 (1967-11-01), Gorawski et al.
patent: 4052054 (1977-10-01), Cardwell et al.
patent: 4074902 (1978-02-01), Bradbury
patent: 4112960 (1978-09-01), Hermanns
patent: 4279413 (1981-07-01), Siwik et al.

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