Patent GB-141839-A (GB)
Title: Improvements in doffing mechanism for spinning and analogous frames or machines
IPC: D01H15/00
Filed: 1919-02-18
Abstract: 141,839. Jackson, F., and Seccombe, R. F. Feb. 18, 1919. Doffing-arrangements; spindle apparatus.-In a doffing-mechanism operating upon the principles set out in Specification 134,023, and applied to a flyer frame in which the flyers 4, Fig. 1, are secured on the tops of the spindles 3, which are keyed to slide through the whorls 7 embraced by stirrups 6 secured to the frame, the doffer frame 23 carrying the bobbin grips 25 slides in guiding- brackets 21. The brackets 21 are carried by vertically sliding rods 17 controlled by levers 18. The horizontal movements of the frame 23 are controlled by a slotted lever 27 engaging a stud 22<a> on the frame and deriving its motion from a camgroove on the cam 51. The spindles are mounted in sliding blocks 11, which can be raised and lowered by levers 14. The front receiving-mechanism comprises a sliding frame 38 carrying horizontal rails 41, 41<a>, with pegs to receive the full bobbins 1 and the empty bobbins 43. The frame 38 is controlled by levers 39. The levers 14, 18, 39 are all operated by edge-cams on the cam-wheel 51. The bobbin grips 25, Fig. 5, mounted on the frame 23 comprise pivoted arms 61 with jaws 63 controlled by a spring 64. These arms or opened automatically as the frame moves forward by stationary lugs 26 on the frame, which engage pivoted arms 62 with projections 65 sliding through slotted upturned portions 66 of the frame and pressing against the arms 61. The flyers are removed by devices which are moved horizontally by levers 32 controlled by a cam-groove in the cam 51, and which comprise a rail 67, through which work screws 71 carrying the flyer holders 73. The screws are rotated by a bar 68 carried by pins on the horizontal faces of revolving wheels. A guard 74 prevents the yarn from fouling the bar 68. After the flyers have been unscrewed and withdrawn from the spindles and the spindles lowered through the bobbins 1, the frame 23 is moved forward by the lever 27 to cause the grips 25 to embrace the full bobbins. The frame 23 is then raised by the rods 17 and moved farther forward to place the full bobbins on the pegs on the ascending rail 41, and the grips are released by lugs 44 on the rail. The frame 23 is then retracted and the front receiving-mechanism raised still farther to bring the empty bobbins into position, where they can be seized by the bobbin grips, brought over the spindles, and lowered into position. The parts are then all returned to their normal positions, a few turns are wound on the empty bobbins, and the ends severed. A sufficient supply of yarn between the full bobbin and the flyer is obtained by reversing the driving roller, by allowing free rotation to the full bobbin on its peg, by imparting rotation to the receiving-pegs during the descent of the frame 38, or by turning the bobbins by flexible fingers on the frame 38. The doffing-mechanism is put into operation when the lifter-rails are at their lowest points. In applying the device to a cap frame, the doffer frame 93, Fig. 13, and front receiving-mechanism 98 are operated as described above, but the actuating-lever 95 is modified as shown. The caps are removed by grips 82, Fig. 22, provided with tending-wires 89, the caps being grooved to accommodate the grips. The empty bobbins are gripped nearer to their bases than the full bobbins, so that when they are in position on their spindles and ready to be released, sufficient room is allowed to enable thread-locators 100 mounted on a rotary bar 99 to place the threads between the bobbin bases and the whorls, so that they will be gripped when the bobbins are released. Front receiving- mechanism of the types described in Specification 134,023 may replace the mechanism described above. The thread-locators 100 may be operated by a rack 131. Fig. 24, carrying a sliding catch 133. A piece 135 carried by the descending front receiving-mechanism depresses the rack until the catch 133 escapes from a vertical guide 134 and is pushed under its edge. The rack remains locked until a piece 136 carried by the ascending spindle rail moves the catch to the left and engages it by a lug 137 to raise the rack. The thread-locators are moved laterally by a pin on the bar 99 engaging a cam-groove in a suitable guide. The pinion 130 is keyed to the bar to slide on it. The bar 99 mav be rotated by projections on the front receiving-mechanism engaging arms on the bar and rotating it against the action of weights or springs. The thread-locators may be mounted upon, and operated by the movements of, the front receiving-mechanism. The bobbin grips 25, Fig. 17, when applied to a cap-frame, may be provided with additional thread-locators 108 operated by the movements of the arms 61, 62. The heads of the whorls and bases of the bobbins mav be formed with radial serrations to assist in holding the threads. The thread-cutting device may comprise three rows of teeth, the middle one being formed on a stationary bar, and the outer ones being pivoted to the bar and also to connecting-bars adapted to move simultaneously in opposite directions. The outer bars or the central bar may be adapted to slide horizontally. An alternative form comprises bars with teeth shaped as shown in Fig. 29. The teeth are, in each arrangement, provided at irregular distances, so that the threads shall be severed a number at a time. In order to position the flyers at right-angles to the rails prior to the doffing-operation, a sliding bar 146. Fig. 30, is employed carrying projecting wires or pieces 145. In the mechanism described in Specification 134,023, when a hinged head-piece 102, Fig. 16, is employed on the front receiving-mechanism 6 to receive the removable lifter-plate 103 and is adapted to be tilted to throw off the full bobbins into a trough, the lifter-plate is locked to the head-piece by loops 105 on a rod 106 engaging hooks 104 on the head-piece. Further, the sliding doffer arms may be controlled, as regards their horizontal movements, by a lever 152, Fig. 32, working between rollers 153 on the arms 151. The spindles may be formed in two parts adapted to telescope one within the other and provided with pins and grooves for driving purposes to allow them to be lowered for doffing. The doffing-means may be hung or fixed on the lifter-plates or poker heads to be capable of operation at any point of the lift.