Patent GB-142325-A (GB)
Title: Improvements in or relating to the detection and removal of slubs and like irregularities in yarns or threads used in textile machines
IPC: B65H63/06
Filed: 1919-05-27
Abstract: 142,325. Abbott, E. J. May 27, 1919. Sewing-machines; knot-tying devices. - In textile machines in which yarn &c. is passed from one package to another, such as winding, warping, knitting, spinning, weaving, or sewing machines, means are provided to operate on the yarn in its passage to detect a slub or enlargement on the yarn and to cut out the slub &c. and tie together the severed ends of the yarn. The device is shown as applied to a winding-machine having a replenishing-mechanism, as described in Specification 142,376. The supply bobbins 15, Figs. 1 and 2, are mounted on pegs 14 on a circular carrier 13. The ends therefrom are passed through - pivoted yarn detectors 31 and guides 38. The ends being wound pass up in a loop over a guide roller 84, and thence through suitable guides to the cheese 4, driven through frictional contact with the drum 5. The traverse guide 10 is reciprocated by the cam 9 driven from the main shaft 7. The ends from the reserve bobbins are wound round pegs 39 and held taut between the detectors 31 and pegs 39. The creel 13, Fig. 2, is mounted on a hollow post 16 held against t rotation by a pin 18 in a socket in a bracket 17. A sleeve 19 is secured to the creel and carries at its upper end a hollow cylindrical head 20, provided with a flange 21 having ratchet teeth 22 normally engaged by a pivoted detent 23 to prevent rotation of the head and creel. When the end 3 from a supply bobbin fails, the detector 31 engaging the end fails and makes contact with a detector segment 30 insulated from and carried by a flange 28 on a bracket secured to the upper end of the post 16. The consequent completion of an electric circuit energizes electromagnets 27 and raises the detent 23, thus allowing the creel to be rotated by friction gearing 41, 42 continuously driven from the main shaft 7 by a belt 45. The segment 30 is provided with gates or notches, which allow the end of the operative detector 31 to pass through and break contact, thus stopping rotation of the creel when the reserve bobbin is in place to have its leading end, which is tied to the peg 39, secured to the end of the yarn from the exhausted bobbin. The knotting and severing mechanism is indicated generally at 47 in Fig. 1, and comprises a frame 52, Figs. 3 and 6, carrying a shaft 57 driven continuously from the main shaft 7 by a belt 60. A sleeve 53 is mounted upon the shaft 57 and carries cams 54, 55, 56. The shaft 57 carries a ratchet wheel 58, and the cam 54 carries a pawl 62 normally held out of contact with the ratchet wheel by a spring-control1ed rod 64 secured by a catch 65. A pivoted arm 74 adapted to be raised by electro-magnets 76 energized simultaneously with the electro-magnets 27 releases the catch when the mechanism is to operate, and allows the rod 64 to move to engage the pawl with the ratchet and cause rotation of the sleeve 53. The rod 64 also by its movement interposes a segment 77 between the cheese 4 and the drum 5, and stops the winding. After one revolution of the sleeve 53, the cam 54 resets the rod 64 and lifts the pawl 62 from the ratchet 58. A hollow tubular casing 88 is mounted upon the frame 52 and a current of air is drawn up through the casing by a fan. An endless chain 85, on which is mounted the guide 84, is arranged in the casing 88. The guide 84 is normally in the position x shown is Fig. 1, and the chain is driven from. the sleeve 53 through the gears 57<1>, 95 at such a rate that the guide travels once round the path of the chain during the one revolution of the sleeve. When the new bobbin comes into position on movement of the creel, the leading end passes in front of the stationary guide 83 and between arms 98 and 86 mounted on a vertical spindle 96. The arm 86 is loose on the spindle and is normally pressed by a spring 97 against the stop 102. The arm 98 and a higher companion arm 99 are secured to the spindle, the rotation of which is controlled by the cam 56. A spring 101 holds a bowl 100 against the cam. When the sleeve begins to rotate, it moves the arm 98 to grip the two ends between itself and the arm 86, and then moves them into the range of action of the tying and severing device. This comprises a blade 107, Figs. 5 and 11, pivoted between two fingers 111, 112 at the end of a stem 105 mounted on a bushing 103 carried by the framework 52. The stem 105 is driven from the gear 57<1>. A tail-piece 106 on the blade 107 works in an eccentric recess in the bushing to open and close the blade. The stem rotates twice during one operation. The yarns are laid by the arms 98, 86 against the stem 105 in the angle formed by the fingers, and are wound during the first revolution once round the stem close to the bases of the fingers. During the next revolution, the yarns are caught between the fingers 111, 112 and the blade 107, which on closing cuts away the ends and grips the yarns. The arms 86, 98 then moves away and draw the yarns to pull the knot from off the stem and draw it tight. The portion of yarn cut out is carried away by suction. The guide 84 then moves up from below the tying- mechanism and extends the yarn into a loop. The slub detector comprises a pivoted arm 79, Fig. 2, with a weighted counterbalancing-arm 80 normally resting against the stop 82. When a slub passes between the fixed arms 83 and the detector 79, the detector is overbalanced and the arm 80 falls against the sleeve 53, closes an electric circuit through the electro-magnet 76, and thus sets the sleeve 53 in motion. The movement of the guide 84 forms a loop, the two sides of which are engaged by the tying and severing device, which operates as described above. The wiring of the electric circuits is such that the magnets 76 can be energized without the magnets 27 being energized, so that in the event of the passage of a slub, the tying and severing device can be operated without movement of the creel.