Device for controlling the tension of a web

Details Device for controlling the tension of a web Device for controlling the tension of a web

1979-12-20

1981-09-08

McCarthy, Edward J.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

B65H 5900

Patent

active

042880459

ABSTRACT:
The invention describes a device for controlling the tension of a web discharged from a delivery spool including a compensating roller around which the web is guided to which a tiltingly supported lever is connected the deflection of which influences a pneumatic valve, which provides, in a compressed-air line system including a reduction valve, for the pneumatic pressure of a brake cylinder of a pneumatic brake of a machine processing the web, wherein the lever 4 is engaged by a tension spring with adjustable stroke and the lever is tiltable between two end switches 10, 11, which actuate valves including series-connected reduction valves 14, 15 inserted into one pneumatic line 12, 13 each, both being connected to a compressed-air tank 19 which actuates the brake cylinder 22, the valve actuated in case of a decrease of the tension of the web 1 being inserted into the line under pressure 12 and when actuated by the lever 4 connecting the compressed-air tank 19 to the compressed-air source 15a, and the valve actuated in case of an increase of the tension of the web 1 being inserted into a line 13 leading to the atmosphere and when actuated connecting the compressed-air tank 19 to the atmosphere.

REFERENCES:
patent: 2677080 (1954-04-01), Halter
patent: 3101915 (1963-08-01), Aaron
patent: 3784123 (1974-01-01), Lewis
patent: 3974948 (1976-08-01), Kroppenstedt

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