Web tension control apparatus

Details Web tension control apparatus Web tension control apparatus

1981-06-05

1983-10-25

Jillions, John M.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

242 7553, 226 29, 226 45, 226 86, B65H 1702, B65H 1738, B65H 2308, B65H 2504

Patent

active

044113935

ABSTRACT:
Apparatus for controlling the tension of a web during transport, such as a label-carrying web in a heat transfer labelling machine. The web travels from a supply reel, around a dancer roll and metering roll, through various other web handling devices to another dancer roll, and is collected at a rewind reel. Each dancer roll is linked to a clutch for the corresponding supply or takeup reel, so that each clutch exerts a braking torque determined by the web tension at its dancer roll. Each dancer roll is further linked to an air cylinder to provide a user-determined tension level. The carrier web includes pin holes which are engaged by a pin wheel rotatably mounted to the metering roll, so that the pin wheel swivels when subjected to web tension differentials. Swivelling of the pin wheel opens and closes a valve within the metering roll, thereby providing a variable vent for high pressure air supplied to the supply air cylinder. The system provides automatic adjustment of web tension in response to a tension differential at the metering roll.

REFERENCES:
patent: 2893053 (1959-07-01), Powell
patent: 3446451 (1969-05-01), Wilcox
patent: 3630463 (1971-12-01), Mistele
patent: 3892344 (1975-07-01), Corse
patent: 4129238 (1978-12-01), Herd

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