GB425612A - Improvements in and relating to stop motions for spinning and like textile machines - Google Patents

Abstract

425,612. Stop-motions for spinning- machines for long fibre material. MACKIE & SONS, Ltd., J., and MACKIE, J. P., Albert Foundry, Belfast. Sept. 14, 1933, No. 25504. [Classes 120 (ii) and 120 (iii)] In stop-motions of the kind not employing a power-driven actuator and operated by a weight or spring to which a detector is connected for spinning machines for flax, hemp, jute, and like long fibre material, and particularly high speed jute-spinning machines, the detector and weight are connected by latching-surfaces so disposed that the weight tends to keep them in engagement while the yarn is intact and to assist their disengagement upon breakage. A detector 8, pivoted at 11 and normally supported by the intact yarn, is latched as shown in Fig. 3, to a link 9, which is connected to a lever 7 weighted at 15, or spring-controlled, so that, upon breakage, the detector swings clockwise and frees the link 9, whereupon the lever turns about its pivot 10 and a cam surface 16 thereon engages the pressing-roller 1 and separates it from the feed roller, at the same time nipping the roving thereagainst and preventing the drawing forward of the material by the rollers 2, 2. The effective length of the link 9 may be adjusted by a pin and slot connection 23 to vary the effect of the weight-lever 7 in accordance with the strength of the yarn being spun. The means for separating the roller may be distinct from that which grips the roving. The lever 7 tends to press the detector against the yarn, and the detector and link are maintained in engagement with each other while the yarn is intact by reason of the angular inclination alpha of the normal to the line of action X ... X of the link to the latching-face, this disposition also permitting a certain movement under variation of tension. Disengagement is assisted by the weight when the latching-face passes the normal to X ... X. The levers 7 are held out of action as desired during doffing by the engagement of the notched end 20 with hooks 19 on a shaft 18 which may be connected with the starting and stopping mechanism through, for example, a lost motion coupling such as described in Specification 367,852 or a centrifugal coupling so that the stop-motion may be locked until the yarns are fully tensioned. The levers 15 may be individually freed by turning the notched ends 20 about pivots 22. The weight 15 falling towards the front of the machine serves as a signal of the breakage of a yarn, and may be arranged to operate a light or a bell.