GB587406A - Improvements relating to stop motions for thread-consuming textile machines - Google Patents

Abstract

587,406. Stop-motions for knitting-machines. JENNINGS, H. W. K. (Van Raalte Co., Inc.). June 29, 1944, No. 12417. [Class 74 (ii)] [Also in Group IX] In a stop-motion for thread-consuming textile machines in which a broken or slack thread portion is rendered electrically conductive, a current of fluid is directed towards the threads and urges the thread portion towards a pair of spaced electrodes, which can be bridged thereby to close an electrical circuit by which the machine stopping mechanism is operated without the interposition of drop wires. A tube 40 mounted above the warp threads of a knitting- machine is connected with a source of compressed air and, on the side facing the warp, is provided with a series of jet-openings 45. The tube is constantly reciprocated, so that each jet acts in turn against a number of warp threads. A roller 24 dips into a pan of electrically conductive liquid 26, being evenly coated therewith by a wick 27. The roller 24 preferably forms one pole of the input circuit to the amplifiers of a machine stopping device similar to that of Specification 565,182, and the other pole is formed by two conductors 37, 38 and a roller 29 rotated with the roller 24. Any broken or slack thread is blown into contact with the roller 24 and one or other of the conductors 37, 38, or the roller 29. The broken end wets out and becomes conductive, the input circuit to the amplifier is thereby completed, and the machine is stopped. The reciprocation of the tube 40 is effected by a uniform motion cam acting in opposition to a helical spring.