Patent GB-604367-A (GB)
Title: Improvements in or relating to yarn winding machines
IPC: B65H59/30
Filed: 1945-04-23
Abstract: 604,367. Winding yarn. - FOSTER MACHINE CO. April 23, 1945. No. 10141. Convention date, Feb. 5. [Class 120(ii)] In a yarn-winding machine having an electric motor for driving the winding spindle, the motor circuit is provided with switching means including a yarn-actuated selector, lightly balanced to respond to small tension changes during winding, and a conductor in contact with the selector, the selector moving relative to the conductor to cause power to be switched on and off in the motor circuit, so to :govern the winding speed by allowing the motor to "free wheel" or to smoothly increase in speed depending on yarn tension changes. The yarn 12, after traversing a tension gate 16, passes over a fluted bar 33 and then through the eye 32 of a pivoted dropwire 31 to the traversing mechanism 18 mounted on a counterweighted swinging frame 19, the yarn being wound on a core 11 on a motor-driven spindle 10. The thread guide 18 is spaced from the package by a freely-rotating roller 28, the pressure of which upon the package can be adjusted at 26. The dropwire 31, spring-urged at 81, is adjustably attached to a conducting element 38 with a non-conducting insert 56 in its partcircular face with which operates a conducting roller 45 spring-urged against the elements 38, 56 by a spring 51. In normal running, the roller 45 bears against the non-conducting element 56 and current is maintained to the motor 14 through the circuit 58, 62, 64, 63, '59, (Fig 10). When. however, the thread tension changes, the wire 31 rises or falls and the roller 45 contacts the conducting element 38, above or below the insert 56, to close the circuit through a relay 78 so to remove the arm 64 from the contacts 62, 63 and open the motor circuit. The motor 14 will then coast until its decreasing speed permits the tension to slacken and the insert 56 to again come beneath the roller 45 thus bringing the motor into operation again, or, if the thread was initially slack or had broken, the motor would slow down to stop until the operative, warned by a visual signal &c. had attended to the fault when he would raise the wire 31 until the insert 56 was beneath the roller and so bring the motor into action again. In a modification the insert 56 is carried by a shoe adjustable with respect to the conductor 38 so that the angularity of the wire 31, and hence the tension in the yarn, may be adjusted. In a further modification, an adjustable counterweight is attached to the pivot, carrying the wire 31 in order that the degree of "out-of-balance" thereof may be varied. In a still further modification, the insert 56 seats in a U- shaped element of silver &c. which is stated to provide a non-sparking arrangement between roller 45 and conductor 38. The pivot-pin 40 of the conductor 38 carries a lever 93 adjustably linked at 96 to a tension compensator 77 pivoted at 99. Also springily and adjustably linked to the compensator 77 is one element of the tension gate 16 and a lever 105 which moves clockwise as the frame 19 swings during the growth of the package. Thus as the package grows, the tension imposed on the yarn at the gate 16 and the pressure of the spring 81 on the dropwire 31 are reduced. A knock-off lever 132 moved by an adjustable abutment 138 on the frame 19 operates through an adjustable screw 140 to move the conductor roller 45 from, the elements 38, 56 so as to stop the motor when the package reaches a predetermined size. Specification 603,224 is referred to.