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US 4,088,010 AGranted
Method and apparatus for detecting the presence of yarns
AssigneeRhone-Poulenc-Textile
InventorBernard Isoard
Life of this patent
Estimating the term…
Abstract
A method and apparatus for sensing the presence or absence of yarns using a simple airflow in an open slot formed between parallel plates, the pressure upstream of the proper yarn path being sensed. In one form, the pressure is sensed at multiple points and averaged to accommodate yarn oscillation.
Claims4
The method for detecting the presence of a traveling yarn comprising
- (a) confining a traveling yarn in a narrow zone between parallel plane walls which are able to accommodate oscillations in the path of travel of the yarn, in a plane parallel to and between the parallel plane walls, without contacting the yarn,
- (b) supplying an unidirectional flow of gas to said narrow zone and against said yarn, and
- (c) monitoring the pressure in said narrow zone intermediate said yarn and said gas supply, whereby when the yarn is present in said narrow zone the pressure is higher than when the yarn is not present to form the sole obstruction to the gas flow.
Dependencies are inferred from the claim text.