Zero tension web unwinder apparatus and method

Details Zero tension web unwinder apparatus and method Zero tension web unwinder apparatus and method

1996-07-29

1998-01-20

Jillions, John M.

Winding, tensioning, or guiding

Tension control or brake

Supply controlled

2424181, 2424203, 2424206, B65H 23185

Patent

active

057093520

ABSTRACT:
An apparatus and method for the tensionless unwinding of a gossamer web of material from a bobbin uses a servo control system connected between the servomotors of a web handling apparatus and a bobbin unwinder for controlling the unwinding speed of the bobbin unwinder in relation to the take-up speed of the web handling apparatus. A pulsed infrared sensor is used to sense the web position in a loop between the unwinder and the web handling apparatus and supply a feedback signal to the servo control system for maintaining the web in a substantially untensioned state. A flow of air is impinged upon the web adjacent the sensor to prevent unwanted web movement due to ambient air currents and other transitory forces on the web.

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