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US 4,775,086 AGranted
Take-out/take-up tension control apparatus
OwnerHiroshi Kataokainventor
Life of this patent
Estimating the term…
Abstract
A sheet winding apparatus comprises a take-out roller provided with a tension controller and adapted to take out a sheet rolled by a rolling unit so that uniform tension is applied to the sheet over its entire width, a dancer roller provided with a drive control mechanism and adapted to properly control the take-up tension in the sheet being taken out and wind the sheet on a take-up reel.
Claims8
A take-out tension control apparatus for controlling tension in a film or sheet fed out from a stretching device for stretching a film or sheet to a predetermined thickness, said take-out tension control apparatus comprising:
- a take-out roller for taking out the film or sheet from the stretching device;
- a motor for driving said take-out roller;
- a dancer roller interposed between the stretching device and said take-out roller and thrust against tension in the film or sheet in the direction of increasing the length of a path on which the film or sheet runs;
- means for controlling the thrust acting on said dancer roller;
- displacement detecting means for detecting displacement of said dancer roller and issuing a detected displacement signal;
- and
- a speed controller for receiving said displacement signal and controlling the drive speed of said motor on the basis of said displacement signal so as to put said dancer roller at a predetermined position.
4 more elements
Dependencies are inferred from the claim text.