Patent GB-903211-A (GB)
Title: Improvements in textile speed frames and like machines
Inventor: FRANCE JOSEPH
IPC: D01H1/24
Filed: 1960-03-03
Abstract: 903,211. Control of A.C. motors. T.M.M. (RESEARCH) Ltd. March 13, 1961 [March 3, 1960], No. 7591/60. Class 38 (3). [Also in Groups IX and XXIV] In a speed frame with means for driving the flyers and bobbins including driving and driven conepulleys UC, BC connected by a belt to vary the gearing-ratio, means are provided (a) to raise the bottom cone and (b) for restoring the belt to starting position when the cone is so raised, both means being actuated by a common motor M, which, when driven in one direction operates the coneraising means and when driven in the reverse direction is effective to operate the belt-shifting means, the driving connection between the motor and either means being interrupted when the other means is in operation. In Fig. 1, motor M is geared to a gear 16 which can drive a shaft 13 through a oneway clutch FW in a direction appropriate to raise a cradle BCC by rotating a crank-wheel 15 clockwise. When motor M is reversed and a magnetic clutch 21 is energized, gear 16, now rotating oppositely, can drive through gears 20, 19 a sprocket 18 in the direction of the arrow to move a chain 17 to which is connected at RB, a rack R carrying a belt fork BF in a direction appropriate to restore the belt to starting position. A circuit for controlling the motor is shown in Fig. 2. With switches in the position shown, start-switch RBS is depressed to establish a circuit for a relay R1 which drives the motor in a direction to drive crank-wheel 15; as it starts to rotate cam 22 leaves switch 24 and causes it to move to its second position shown in Fig. 2 to lock-in relay R1. When wheel 15 rotates to a position where rod CCR is vertically above starting position, cone BC thus being raised to slacken the belt, cam 22 engages switch 26 which is thus thrown to break the circuit to relay R1 and energize relay R2 to reverse the motor and energize the coil MC of clutch 21. Rack R now begins to move, carrying the belt with it, until a detent D engages switch 23 which is thus thrown to de-energize R2 and MC and re-energize R1, whereby the motor is again reversed and wheel 15 again starts to rotate. Switch 26 is immediately reversed to maintain the circuit to R1 through switch 24, which again resumes the position shown in Fig. 2 when it is re-engaged by cam 22 as wheel 15 rotates to a starting position with cone BC lowered to re-tighten the belt. A pilot light IL indicates completion of the resetting operation. Switch 27 permits the apparatus to be operated to lift the lower cone without moving the belt; switch MS is open during normal operation of the frame to prevent the cone-belt mechanism from then being operated; switch MLS is controlled by a length measuring device to prevent operation of the cone-belt mechanism when the frame is stopped during normal running and contacts R1A and R2A form an electrical interlock in the cone-lifting and beltshifting circuits. Switch 25 is operated simultaneously with switch 24 and is in the retaining- circuit of the main frame-drive so that when the lower cone is lifted, switch 24 then being in its upper position 25 is open so that the machine cannot be continuously operated, although it can be " inched " to provide enough roving for piecing. In an alternative control circuit, Fig. 3, length-controlled switches MLS1 and MLS2 are inter-connected, one being open when the other is closed and MLS2 being in the frame motor circuit. With MLS1 closed, MLS2 is open, and the frame would be stopped, but for interconnected manual switches 28A, 28B which are closed for a capacitor FC to be charged to give a pulse to relay PR through a rectifier 29. Relay PR closes contact PR1 to start a sequence of operations as already described. When the bottom cone is lifted, the frame-motor continues to run, for roving to be collected on the flyer to form a piecing length, until a detent 31 on rack R trips switch 30 when the frame drive clutch is disengaged. The amount of roving provided for piecing may be varied by changing the position of switch 30; alternatively, switch 30 may be replaced by an adjustable timer. A resistance DR serves to discharge capacitor EC when MLS1 is open. The Provisional Specification describes an arrangement where a three-phase supply is controlled to drive the motor in opposite directions. Length-controlled switch MLS being closed, start-switch RBS is closed to energize contactor K1 and close contacts to drive motor BRM forwardly, and contact K1b being now closed, K1 is locked-in through switch SW2. When the crank-wheel has rotated to lift the bottom cone, SW2 is thrown to de-energize K1 and, contact K1a being thus closed, to energize K2 to close contacts to energize clutch-solenoid CS and to change over the motor supply. When the conebelt regains starting position, SW3 is operated, de-energizing K2 to de-energize the clutchsolenoid and stop the motor. Relay R3 is now energized and is locked in by R3a, R3b opening to ensure that K2 remains de-energized. The main motor is now brought in to deliver enough material for piecing-up, and the belt is retightened by closing manual switch LCP which energizes K1 to drive the motor forwardly via R3a, K2a and SW1. As the crank-wheel rotates SW2 changes to the position shown, and locks-in K1 via K1b K2a and SW1, the circuit being finally interrupted by the opening of SW1.