Patent GB-1307079-A (GB)
Title: Controlling the knotting procedure in textile machines particularly  automatic winding machines
IPC: B65H54/02
Filed: 1970-04-21
Abstract: 1307079 Yarn winding machines ELITEXZAVODY TEXTILNIHO STROJIRENSTVI GENERALNI REDITELSTVI 21 April 1970 [29 April 1969] 18964/70 Heading D1J In a yarn winding machine having an automatic knotting mechanism, means are provided whereby absence of yarn causes a pneumatic pulse to be generated and this pulse causes a pneumatic circuit to be connected to a pressure fluid source for a period sufficient to cause the knotting mechanism to perform a knotting operation. The pneumatic pulse is of short duration but is sufficient to cause said pneumatic circuit to be automatically pressurized for a period that does not end until the knotting cycle is complete.  In Fig. 1 a rotatable cop plate 1 carries a supply bobbin 2 and a spare bobbin, the cop plate being indexible automatically through 180‹. The yarn from the spare bobbin is held by an automatically extensible guide 25. The yarn 3 from bobbin 2 passes through a balloon limiter 4, a guide 5, a supply stop motion 6, a brake 7, an electronic clearer 9, a yarn breakage stop motion 10, an automatically extensible guide eyelet 11, feed rollers 12, a sensor checking the pull of a pneumatic device 15, and thence to a yarn storage supply chamber 16 from which the yarn is drawn via a guide 17, brake 18, lubricating device 19 and end stop motion 20 before passing around a further guide and thence to the take-up package 22. A knotting mechanism includes a lever 23 that can rotate in the direction S through 360 degrees to pick up the yarn of a broken end, or the yarn from a fresh supply bobbin, and carry it past a knotter 14 operating in conjunction with a gripper 24 and yarn feeding forks 141. Yarn Breakage. If the yarn 3 breaks between the brake 7 and the feeding rollers 12 a swing- able yarn sensor 61, Fig. 5, of the stop motion 10, rocks to the full line setting and this permits piston 641 of a pneumatic circuit to rise and allow a pneumatic pulse to pass via an outlet of a pneumatic sensor 64. The pneumatic sensor 64 is coupled to a distributing valve 31, Fig. 2, and the pulse output of the sensor 64 forces the piston of the distributing valve 31 to move to the right away from the setting illustrated. This causes (a) the piston rod 32 of valve 31 to retract from a notch in a stop plate 33, (b) a pressure source on the distributer to be coupled to a working cylinder 36, and (c) a switch 34 of a solenoid valve 35 to close. When the piston 41 of the working cylinder 36 is raised it causes a gear wheel (63) Fig. 4 (not shown) to rise and (a) complete a drive to the stop plate 33 that is now free to rotate until the notch therein again meets the piston rod 32; (b) cause the knotting mechanisms 14, 24, 141 to operate. When the piston 41 rises the working cylinder 36 also acts as a pressure fluid by-pass through a distributor 37 to cause the pressure fluid to flow into stop motion 6, brake 7 and stop motion 10 to hold these open ready for re-threading. Thus in Fig. 5 the pressure fluid flow from the distributor 37 acts on the piston 631 of power unit 63 to rock the swingable yarn sensor 61 to the broken line setting. This holds the sensor 61 in the open, broken line, setting and shuts off the pulse from the device 64.  Whilst the stop plate 33 rotates once the yarn introducing lever 23 also rotates once. The lever 23 grips the yarn between the guide 5 and stop motion 6, Fig. 1. The other end of the yarn is held by gripper 24. Lever 23 then swings through a complete revolution to introduce the yarn supply from the cop 2 into stop motion 6, brake 7, guide 8, electronic cleaner 9, stop motion 10, extendable guide eyelet 11, feed rollers 12, sensor 13, knotter 14 and pneumatic device 15. The yarn is then knotted in known manner to the yarn and held by the gripper 24. During this time the winding operation continues by virtue of the yarn stored in the supply chamber 16. After knotting, the lever 23 releases the yarn 3 and. carries on its motion until the notch in the stop plate 33 re-engages with the piston rod 32. Re-setting of stop motion 10. When the pulse from the stop motion 10 causes the piston of the slide valve 31 to move to the right to cause the pressure fluid source 30 to be connected to a slide valve 36 for the reasons stated above, the resulting movement of the slide valve 36 couples the pressure fluid source 30 to a power unit 63, Fig. 5, that serves to move the stop-motion 10 back to its original setting, that is to say the sensor 61 is moved back to its broken line setting, and so cut off the pulse that was emitted by the sensor 64. Exhaustion of yarn. If the yarn supply from the cop becomes exhausted, stop motion 6 will re-act before stop motion 10. Stop motion 6 comprises a sensor of the kind already described with reference to Fig. 5 and the resulting pneumatic pulse from this sensor moves a slide valve 42 to the right in Fig. 2 to cause a pressure fluid source 30, Fig. 2, to (a) act on a power unit 43 to cause the cop plate 1 to rotate through 180‹ and (b) act on a guide 25, Fig. 1, to move the fresh yarn supply held thereby out into the path of the lever 23. When the stop motion 10 subsequently detects that the yarn supply is exhausted it causes, as described above, one rotation of the lever 23 with a resulting knotting action of the fresh yarn supply with the old. It is possible to perform the connection with only one stop motion, e.g. the yarn breakage stop motion 10 with the condition that the supply cop 2 be changed upon any yarn breakage.