Patent GB-337529-A (GB)
Title: Improvements in or relating to stop motions for spinning, doubling and twisting, and like textile machines
IPC: D01H13/18
Filed: 1929-09-12
Abstract: 337,529. Mackie & Sons, Ltd., J., and Mackie, J. P. Sept. 12, 1929 Delivery, stopping; rollers and roller heads. - In an automatic stop-motion for spinning, doubling and like machines having a pair of rollers for feeding and a pair of rollers for delivering the yarn, a feeler member which is normally supported bv the yarn or roving, on breakage of the yarn swings into the path of a projection on one of the delivery rollers. The feeler is then moved under the power of the machine and acts directly on one of the feed rollers to move it and so stop the feed, and also to hold the broken end. The machine can be re-started without the necessity of re-setting the feeler member, if desired; the device also allows of manual stopping and starting. Figs. 1 and 2 show a dry spinning-frame fitted with the stop-motion, and Fig. 3 shows the position of the various parts after the yarn has broken. The yarn is wound off bobbins 1 and passes through eyes 2 in a horizontal bar 3, thence to the feed rollers 5 5<a>. The front rollers 5a are positively driven, whilst the rear pressing rollers are mounted in pairs so that they can be moved towards the back of the machine, but are normally held in contact with the front rollers by means of a counterweight 9 on the end of a bell-crank lever 10 pivoted at 11. The thrust-rod 13 is adjustable in length so that the direction of thrust due to the counterweight 9 on the shalt 7 can be varied. After leaving the feed rollers, the yarn passes over the breast plate 14, the conductor 17, and then between a pair of delivery rollers 19 and 19<a>, of which the front one 19<a> is positively driven and the rear one 19 held in contact therewith by means of a counterweight 22. The yarn passes from the delivery roller through the revolving eye 25 of a flyer 26 and thence to the bobbin 27. The yarn normally supports the feeler 28, but upon breakage of the yarn, its cranked shape (see Fig. 2) causes it to swing about the universal joint 30 until a projection 32 comes into the path of a pin 33 on the delivery roller 19. The latter continues to rotate, lifts the feeler 28, and so turns the three-armed lever 29 about its pivot 31 in an anti-clockwise direction. The shaft 7 is pushed along the ledge 8, thus destroying contact between the delivery rollers 5 and 5<a> and so stopping the feed from the bobbin 1. The shaft 7 falls into the notch 39, which is so disposed that this causes a further slight movement of the lever 29, carrying it over a dead-centre and lifting the feeler 28 so that the projection 32 is clear of the delivery roller 19. This allows the feeler 28 to continue its swinging movement until it is entirely on the right-hand side of the roller 19 (Fig. 2). The position of the parts is now as shown in Fig. 3. A pin 36 on the projection 37 of the three-armed lever 29 grips the yarn against the horizontal bar 3. To re-start the machine, the lever 35 is lifted. The feeler is re-set by moving it to the rear of the machine, across the back of the roller 19, and into the position shown in Fig. 1. In order that the operation of one stop-motion will not affect adjacent pairs of feed rollers, the shafts 7 are formed with flats 40 and are traversed by pins 41 disposed diametrically in the bores of sockets 42 on which the rims of the rollers 5 rotate. With this construction, operation of the stop-motion allows the appropriate end of the shaft 7 to slide in its guide 8 without separating the feed rollers at the other end, since the clearance between the shafts 7 and the sockets 42 allows a certain amount of obliquity of the shaft with respect to the face of the rollers 5. The invention is also described in the Provisional Specification with reference to a twisting-machine.