Back to results
US 4,023,399 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 presence upstream of the proper yarn path being sensed. In one form, the pressure is sensed at multiple points and averaged to accommodate yarn oscillation.
Claims8
A sensor for detecting the presence of yarns including
- a. a pair of substantially planar walls, said walls being parallel and spaced from each other to form a narrow yarn zone,
- b. said narrow yarn zone being of sufficient width to pass a yarn freely therebetween,
- c. gas supply means including a single delivery outlet for directing a flow of gas between said walls in a direction parallel to said walls and against said yarn zone,
- d. and pressure sensing means including a pressure-sensing aperture in one of said walls intermediate said gas supply means and said yarn zone aligned with said delivery outlet along the axis of flow of the gas therethrough, so as to detect the changes of pressure in the narrow zone due to the presence of the yarn.
1 more element
Dependencies are inferred from the claim text.