G - Physics – 05 – D
Patent
G - Physics
05
D
G05D 15/01 (2006.01) B65H 23/06 (2006.01)
Patent
CA 2131410
ABSTRACT OF THE DISCLOSURE An apparatus and method (10) for controlling the tension and stopping action of web material fed from a supply roll (S) is disclosed. A supply roll of web material is supported on a support assembly (14). A brake (26) is operatively connected to the support assembly (14) for applying a braking force onto the support assembly to apply tension onto the withdrawn web material. The diameter of the supply roll is sensed (32) and a signal is generated to the power supply (30) of a brake proportional to the diameter of the supply roll to vary the applied braking force and maintain a constant tension on the web material during its withdrawal. A stopping signal is generated to the brake power supply during stopping operation of film withdrawal to increase the braking force supplied to the support assembly. The stopping signal is an additive combination of a first signal that is essentially proportional to the diameter of the supply roll and a second signal that is essentially constant.
Cms Gilbreth Packaging Systems
Swabey Ogilvy Renault
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