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US 4,288,045 AGranted
Device for controlling the tension of a web
AssigneeTidland Corporation
InventorWerner Romhild
Life of this patent
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AssigneeTidland Corporation
InventorWerner Romhild
Estimating the term…
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.
Device for controlling the tension of a web discharged from a delivery spool including a compensating roller around which said 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 said web, wherein said lever is engaged by a tension spring with adjustable stroke and said lever is tiltable between two end switches, which actuate valves including series-connected reduction valves inserted into one pneumatic line each, both being connected to a compressed-air tank, which actuates said brake cylinder, the valve actuated in case of a decrease of the tension of said web being inserted into the line under pressure and when actuated by said lever connecting said compressed-air tank to the compressed-air source, and the valve actuated in case of an increase of the tension of said web being inserted into a line leading to the atmosphere and when actuated connecting said compressed-air tank to the atmosphere.
Dependencies are inferred from the claim text.