Improvements in or relating to optical apparatus for detecting the occurrence of broken threads, filaments or the like

Abstract

Abstract 691,069. Detecting broken threads photoelectrically. GENERAL ELECTRIC CO., Ltd., and WARD, L. G. July 31, 1951 [Aug. 1, 1950], No. 19232/50. Class 40 (iii). Broken threads are detected by a photoelectric cell which receives a narrow light beam scanning a region which the broken thread will enter. As shown warp threads in a loom pass from bobbins 20 to a roller 21. Beneath the threads are situated two housings each containing a photo-cell 10, and a light source 11. The light sources each form a narrow beam of light which is reflected from one of mirrors 13, to the photo-cells. The lamp and cell assemblies are oscillated through the angle 12 by a motor 15 and rod 14. So that a broken thread shall interrupt the light beam a gentle stream of air from a nozzle 23 blows on the threads so as to deflect broken threads downwardly. Both cell assemblies feed a common amplifier to stop the machine or operate a warning device. In a modification, Figs. 3 and 4 (not shown), the lamp and cell are mounted at one end of a carriage which is traversed to and fro beneath the threads and at the other end of which is a plane mirror. The stream of air may be ionized.

Inventors

No inventors recorded.

Bibliographic Details