Textiles: cloth finishing – Expanding device for textile webs – Web-condition-responsive operation control
Patent
1975-11-18
1977-12-13
Mackey, Robert R.
Textiles: cloth finishing
Expanding device for textile webs
Web-condition-responsive operation control
26 97, D06C 306
Patent
active
040620948
ABSTRACT:
Apparatus for laterally stretching a web of textile fabric comprising a pair of web-stretching devices disposed at opposite sides of the web, each web-stretching device comprising at least a pair of parallel uncurling fingers and a control roller disposed therebetween. The fingers and the roller engage a selvage of the web to exercise a lateral pulling force thereon, and when a detector detects lateral displacement of the web, the position of the control roller relative to the fingers is changed to change the lateral pulling force on the web so as to correct the lateral displacement. At the same time the position of the detector is changed so as to prevent overshooting and render the sensitivity higher and response quicker. When the width of the web changes, the distance between the two web-stretching devices is changed so as to compensate for the change of the web width.
REFERENCES:
patent: 1376736 (1921-05-01), Thornber
patent: 2639483 (1953-05-01), Wester
patent: 3156396 (1964-11-01), Snyder et al.
patent: 3414954 (1968-12-01), Alexeff
patent: 3527394 (1970-09-01), Alexeff
patent: 3673647 (1972-07-01), Koster
patent: 3838481 (1974-10-01), Kuroda
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