Stretch ratio control circuit for multiple station web stretchin

Details Stretch ratio control circuit for multiple station web stretchin Stretch ratio control circuit for multiple station web stretchin

1981-09-28

1984-03-13

Mackey, Robert

Textiles: cloth finishing

Expanding device for textile webs

28245, 318 7, 425 66, D06C 300, H02P 700

Patent

active

044358830

ABSTRACT:
A control circuit for apparatus stretching a web between intake, discharge, and intermediate pulling stations (20-1, 20-2, 20-3). The circuit includes a first signal generator (32) for providing a signal to the intake discharge station (20-1) corresponding to the desired speed of the web at that station. A multiplier (40) alters the first signal in accordance with the amount of overall stretching, or stretch ratio, desired in the apparatus. The multiplier provides a second signal to the discharge station (20-3) corresponding to the speed of the web at the discharge station necessary to obtain the overall stretching. A second signal generator (48-66) subtracts a selected amount of the difference between the first and second signals from the second signal to provide a third signal to the intermediate pulling station (20-2) that distributes the overall stretching in the apparatus between intermediate zones formed by the adjacent pulling stations.

REFERENCES:
patent: 2447209 (1948-08-01), Rendel et al.
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patent: 3029022 (1962-04-01), Horvath et al.
patent: 3118097 (1964-01-01), Hettler
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patent: 3701933 (1972-10-01), Andersson
patent: 3707658 (1972-12-01), Hilsenbeck
patent: 3803672 (1974-04-01), McGuffin et al.
patent: 4174237 (1979-11-01), Hemming, Jr. et al.

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