Variable torque device for maintaining constant web tension

Details Variable torque device for maintaining constant web tension Variable torque device for maintaining constant web tension

2006-10-31

2006-10-31

Gray, David M. (Department: 2852)

Electrophotography

Image formation

Fixing

C399S324000, C242S410000

Reexamination Certificate

active

07130571

ABSTRACT:
A variable torque device for maintaining constant tension in a web of material as the web is unwound from a supply roll. The variable torque device includes a lead screw attached to the shaft of the supply roll via an appropriate gear ratio. A coil spring is located between a hub on the lead screw and a set of rings and friction pads. As the lead screw rotates, the hub translates, thus changing the displacement of the coil spring, which in turn changes the loading of the rings and friction pads. With a full supply roll the coil spring is compressed so as to create an amount of torque to create the desired web tension. As the supply roll unwinds, the rotation of the lead screw translates the hub to expand the coil spring, reducing the torque and maintaining the web tension constant.

REFERENCES:
patent: 3599896 (1971-08-01), Schwartz
patent: 5749038 (1998-05-01), Fromm et al.
patent: 6006063 (1999-12-01), Shimizu et al.

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