Controlled tension let-off for unwinding rolls of material

Details Controlled tension let-off for unwinding rolls of material Controlled tension let-off for unwinding rolls of material

1975-08-27

1977-01-04

Christian, Leonard D.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

242 7553, B65H 2522

Patent

active

040008657

ABSTRACT:
Controlled tension letoff apparatus for unwinding rolls of material includes a constant tension dancer roll operatively associated with the material being unwound, and a plurality of air pressure regulators, some of which emit variable control signals in response to the movement of the dancer roll and the tension sensed thereby while one of such regulators emits a constant control signal. The signals are fed into a computing air pressure relay, the output of which, in turn, impressed upon brake actuators associated with the material beam braking systems and in this manner, the braking level of the letoff beams is suitably controlled, so as to maintain constant the tension level of the material, in accordance with the movement of the dancer roll and the tension sensed thereby during the various operational modes of the system.

REFERENCES:
patent: 3811637 (1974-05-01), Abler

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