Patent GB-1019994-A (GB)
Title: Improvements relating to spinning machines
Inventor: MACKIE JOHN KAY PRINGLE
IPC: D01H1/42
Filed: 1961-11-16
Abstract: 1,019,994. Spinning-apparatus. JAMES MACKIE & SONS Ltd. Nov. 8, 1962 [Nov. 16,1961], No. 41062/61. Heading D1D. [Also in Division F2] A ring-frame for balloonless spinning comprises auxiliary mechanism for lowering the ring rail to doffing position while maintaining a drive to rotate the spindles at a speed low enough to avoid ballooning the yarn, and a control member operated when the bobbins are full which interrupts the main drive and starts the auxiliary mechanism and also applies a brake to each traveller to maintain sufficient tension in the yarns to avoid ballooning. As shown, ballooning is avoided by wrapping the yarn around an extension 8 of the spindle. The package is built by a rotating cam 75 which rocks a lever 12 to oscillate a drum 14 operatively connected through a second drum to the ring-rail through means which include a pulley 27. At each oscillation, the second drum is indexed forward by a ratchet wheel 20, to which it is geared at 17 and provided with pawls 18,19 so that it is driven in one direction only. When the ring rail reaches its uppermost position, a yardage counter or a projection 30, (Fig. 1 not shown), on pulley 27 operates a switch 31, (Fig. 1 not shown). This (a) cuts out the main drive motor so that the frame starts to slow down. It also (b) operates a time delay mechanism which starts an auxiliary motor 32, which runs at a slower speed than the main motor, at the moment when the speed of the frame drops to that of the motor 32. This drives the spindles through an electromagnetic clutch energized at the same time as the motor is started. The switch also operates (c) a clutch which connects the shaft 36 of the drafting-rollers to the gears 17 by gearing 41, 42, and also operates (d) a solenoid 45 which acts to lift off the pawls 18,19. This allows the drum 14 to turn in the reverse direction to lower the ring-rail. The switch also operates (e) a solenoid 54 to rotate by a chain 53 and wheel 52 a rod 51 on which are mounted the lappets 50 which are thus raised to pull the yarn off the extensions 8. The switch also operates (f) a solenoid 69 to slide a bar 66 Fig. 3 under a pin 65 on a wheel 59 mounted on the ring rail and geared to a shaft 57 on which are mounted members 55 one for each ring. Thus as the ring-rail falls, the wheel is rotated to bring each member 55 into a position where it brakes the corresponding traveller. When the ring-rail reaches its lowered position, it operates a switch which de-energizes the clutch on the shaft 36 the solenoid 45 is now also de-energized to re-engage the pawls. Yarn continues to be delivered however so that undercoils are wound on the base of the bobbins; these slip off the bobbin when it is doffed to be trapped against the spindle when a fresh cop-tube is donned. Motor 32 continues to run under the control of the delay mechanism until the undercoils are complete and then stops. The lappets are restored by the de-energizing of solenoid 54 and the traveller brakes are restored manually and the frame restarted. During the winding of the undercoils, the cam 11 must remain in the same position. Accordingly it carries a pin 75 co-operating with a switch 76 controlling an electromagnetic clutch which is maintained energized during the normal wind, but which is de-energized when the ring-rail reaches its lowest position by the switch so that the cam stops with its pin in engagement with the switch.