| 摘要 |
1478681 Open-end spinner: intermittent fibre feed at start of spinning F STAHLECKER and H STAHLECKER 7 Aug 1974 [16 Aug 1973] 34846/74 Headings DID and D1N In a method of piecing-up thread at a spinning station of an open end spinning machine having a plurality of stations and a patrolling piecing-unit, a spinning rotor brake is released, fibres are fed at a reduced rate to the rotor, a thread end is fed into the rotor to join the ring of fibres within the rotor the rate of fibre fed is increased to the normal operating rate, and the thread is drawn off. As shown, Fig. 1, spinning is started at rotor speed n A at time T A as the rotor is accelerated (line 1) to its normal speed n B at T H , and the fibre feed defined by line 3 is either delayed so that normal feed QL is achieved after T A , or the fibre feed drive is switched repeatedly so that the feed line 5, Fig. 2, approximate to line 1. Apparatus to achieve the required interrupted increase in fibre feed comprises, Fig. 3, a piercing-up tender 6 movable on rail 49 between spinning units 7. To start spinning unit lever 20 is pivoted so that brake 15 is removed from rotor shaft 10, and belt 13 is pressed by roller 14 onto the shaft. Lever 20 pivots tender lever 44 to actuate switch 45 which, after a time-lag relay of the switch has actuated, opens thread trapper 46 and causes driven rollers 36, 34 to feed thread from cone 40 of the unit through channel 32 into rotor 9. Switch 45 also actuates switch 47 and solenoid 48 to place a thread stop-motion alternately in positions 30, 31. The thus switched stop-motion switch 29 controls solenoid clutch 26 to repeatedly interrupt the drive to fibre feed roller 22 to provide the required fibre feed. When the tension in the spun-in thread rises tension feeder 43 reverses rollers 34, 36, the thread stop motion is maintained in position 30 to maintain clutch 26 engaged, and tender arm 37 pivoted to reengage cone 40 with a winding roller of the unit. |
