Patent GB-190704458-A (GB)
Title: New or Improved Apparatus for Spinning and Twisting or like Machines for Self-actingly Doffing Bobbins and Supplying Fresh Bobbins to the Spindles.
Inventor: LISTER FRANK
Filed: 1907-02-23
Granted: 1908-01-16
Abstract: 4458. Lister, F. Feb. 23. Doffing-arrangements]; spindle apparatus ; thread holding and severing arrangements ; tin rollers.- Automatic means are provided in spinning and twisting machines to remove the full bobbins from the spindles and to replace them with empty bobbins, to hold and to sever the thread between the full bobbins and the flyers or caps, and to twist the ends of thread into the bodies of the full bobbins in order to prevent accidental unwinding when the bobbins are removed. The motions for these operations are derived by means of cams, links, and chains from the shaft 18, which is detachably connected with, and driven by, the loose pulley. The spindle is stopped in the slightly angular position, shown in Fig. 13, by stops 23 operated by the movement of the strap fork. The flyer is attached to the spindle by a quick spiral connexion, so that it may be removed by the upward movement of clips 31 attached to the longitudinal rod 29, which is partly rotated by a chain actuated by a cam on the shaft 18. The spindle rail is gradually lowered by a cam 54 operating through a chain and the bracket 37. Meanwhile the bobbin holder is advanced until it is centred over the spindles ; the lifter rail, which is operated by the chain 101 from the rod 100, then rises and forces the bobbin on to the spring holders 63, as shown in Fig. 5. The bobbin holder is actuated by a cam which, acting through a chain 78, Fig. 13, moves a rod 76 horizontally ; this operates a chain 70 which is attached to the bar 60 carrying the tubes 61 on which the holders are mounted. Passing through the tube 61 is a rod provided at one end with a crank, and flattened, as shown in Fig. 5, at the other so that, when it is turned, the flattened portion closes the spring clips and allows the bobbin to drop off. This operation is performed, when the holder is centred above the dummy spindle 104, by an horizontal cam 105, Fig. 6, which is rotated by gearing from the shaft 18 and is provided with a recess 111 which allows the springs 109 to move the bracket 108, thereby displacing the rod 67 and operating the cranked ends of the rod 66. The bobbin holder is further advanced until it is over the empty bobbin, which is forced over the spring pieces by lifting-means comprising a chain 117 operated from a sliding rod controlled by a cam lever ; it is then retracted and the empty bobbin is released by the depression 112 of the cam 105 and drops on to the spindle. The clips 31 are then lowered to replace the flyer. While the bobbin carrier is returning, an arm 124<a> is rotated by a chain, connected to a longitudinal rod which is operated by a cam, so as to grip the thread in a rail 130, the full bobbin being rotated first in-one direction to unwind a few turns of thread, and then in the opposite direction to wind the thread in the body of the bobbin and to break it, by a rack 132 which engages a pinion on the spindle. When the thread is wound upon tubes, which are mounted on single-ended bobbins, a .knife 137, Fig. 17, carried by a disk attached to the spindle pinion, severs the thread. Stop-pieces may be fitted to position the bobbin carriers accurately. Instead of tubes, rods 140, Fig. 18, may connect the carriers with the bar 60, the crank-pieces being then bent downwardly, and operated as before by a bar 142. In cap-frames, the holder for the caps and bobbins comprises a fixed limb 148 which is secured to the reciprocating bar 60, a limb 150 which is carried by the laterally moving bar 149 to grip the cap in the groove 145, and a pivoted limb 152 which is moved by a bar 154 so as to release the bobbins in a similar manner to that described in relation to flyer frames. To prevent the drag washer from adhering to the bobbin when doffing, metal rings are clamped on the rails and are provided with catches 158 to engage the washer; The tin roller for driving the spindles may be provided with two diameters, on the smaller of which the belt rides when the machine is stopped, so as to slacken the bands to allow the movement of the spindle. The cam shaft may be actuated by hand power instead of by worm gearing. According to the Provisional Specification, the transverse worm shaft-which drives the shaft 18 from the loose pulley is movable vertically to engage and disengage the cam shaft ; a rail may be located in front of the bifurcated rail 130 to ensure the yarn being under the base of the yarn on the bobbin ; and the invention is applicable to ring frames.