Apparatus and method for controlling tension and stopping action of web material
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United States of America Patent
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Aug 15, 1995
Grant Date -
N/A
app pub date -
Oct 15, 1993
filing date -
Oct 15, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus and method for controlling the tension and stopping action of web material fed from a supply roll is disclosed. A supply roll of web material is supported on a support assembly. A brake is operatively connected to the support assembly for applying a braking force onto the support assembly to apply tension onto the withdrawn web material.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 and a signal is generated to the power supply 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.
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