Patent GB-348122-A (GB)
Title: Control apparatus for spinning and like frames
IPC: D01H1/24
Filed: 1929-10-29
Abstract: 348,122. Electric control gear for spinning, roving, and like frames. LOW & CO., Ltd., J. F. and HARGROVE, J., Monifieth Foundry, Monifieth, Angus, WATFORD ELECTRIC & MANUFACTURING CO., Ltd., and LAWSON, J. L., Whippendell Road, Watford, Hertfordshire. Oct. 29, 1929, No. 32796. [Class 120 (ii).] Spinning, roving and like textile frames are provided with electrical control gear operated by pushbuttons or their equivalent and arranged so that the operations of stopping, starting, doffing and reloading can only be effected in correct sequence. The frame may be electrically driven or may be belt driven, one or more auxiliary motors or solenoid devices being provided for effecting doffing and reloading with empty bobbins. The control may provide for inching, crawling, running, and stopping the main motor, if electric, and for preventing performance of the doffing and reloading operations except when the frame is stopped. Electricallyoperated means may also be employed for indicating and recording the spindle speed, and for applying drag to the bobbins, e.g. by means of an eddy current brake device such as that described in Specification 334,386, [Class 120 (ii), Spinning, twisting, &c.]. For varying the speed of the flyers associated with the spindles, a manually or automatically operable regulator may be employed. Doffing and reloading with empty bobbins is preferably carried out in separate stages, interlocking arrangements being provided to ensure that the stages of operation can only be performed in the correct sequence. For stopping the frame when the bobbin board or other moving part reaches a predetermined position, limit switches may be used. In addition, the frame may be stopped at any point in the cycle of operations immediately an emergency stop button is depressed, and braking means may be associated with the stopping devices. The diagram shows the electric control applied to a flyer spinning-frame, all switches and contacts being in the positions they assume when not in use, hereinafter referred to as " normal " positions. A double-pole hand-operated main switch 99 controls the entire circuit. The controls comprise an inch button 100, a run button 115, and a stop button 105 for the main motor 1131 which actuates the spindles and traverse mechanism, together with a doffing button 122 and a load button 138. On actuation of the inch button 100, the main switch 99 being closed, current passes from the +ve line 137 through a normally closed contact 101 on a contactor 102, the coil 103 of the master relay 104, the inch button 100, the stop button 105, and through the limit switch 107 operable by the slide which carries the empty bobbins to the -ve line 108. The master relay 104 is thus energized and, being fitted with an adjustable time-lag device to effect closure of contacts 109, 110, one slightly in advance of the other, completes the following two circuits: (1) +ve line 137, contacts 109, normally closed auxiliary contacts 112 on the main motor starter contactor 113, running clutch magnet 111, -ve line 108 ; (2) +ve line 137, contacts 110, main motor starter contactor 113, stop button 105, -ve line. The second circuit when closed causes the main motor starter 113 to function, this starts the main motor 113<1>, breaks the auxiliary contacts 112, 112<1> attached to but insulated from the starter arm, and makes the auxiliary contacts 118, so breaking circuit (1) which includes the running clutch magnet 111. Thus the main motor drives the frame only whilst the inch button is kept depressed. On temporarily depressing the run button 115, the same circuits are energized as when the inch button 100 is operated, but in addition, a rheostat coil 116 of the main motor starter 117 is energized from the +ve line 137 through the auxiliary contacts 118, the current passing to the -ve line 108 by way of the inch button contact 101<1>, the stop button 105 and the limit switch 107 ; the main motor starter rheostat coil 116 then effects closure of the self-sustaining contact 119, which energizes the master relay coil 103 through the contactor 101, and so maintains circuits (1) and (2) above and causes the main motor to keep running whether or not the run button is kept depressed. Actuation of the stop button 105 reopens the circuit which includes the master relay 104, and so the main motor stops and all contacts revert to normal, providing that the limit switch 106, which is in parallel with the stop button, is open. When the bobbins are fully wound the main motor is stopped and the doffing button 122 pressed. Actuation of the doffing button whilst the main motor is still running cannot effect doffing as the contacts 112<1> are open, thus preventing the doffing circuit from being completed. Actuation of the doffing button 122 completes the following doffing circuit:- +ve line 137, auxiliary contacts 112<1>, contactor 102, limit switch 121, doffing button 122, contact bar 124<2>, contactor coil 125, contact bar 127, limit switch 129, -ve line 108. Thus (a) the contactor 102 is energized; this opens the contacts 101 and also closes the second pair of contacts and energizes the unloading clutch magnet 130 ; the main motor cannot now be restarted until doffing and reloading is finished, since the contacts 101 are open and consequently neither the inch button nor the run button circuits can be completed. Also (b) the contactor coil 125 is engerized, this causes the switch 91 to close and the contact bar 125<2> to rise, so opening one pair of contacts and closing another pair 1231. Each of the contactor coils 124, 125, 132, 128 functions similarly. Closure of the switch 91 starts the auxiliary motor 126 which controls the movements of the bobbin board, and causes the bobbin board to start descending, which immediately closes the limit switches 106, 139. The bobbin board continues to descend until the tops of the bobbins are clear of the flyer legs, and then rotates until the board is inverted and the full bobbins drop into a receptacle, and continues to rotate until the spindles are horizontally disposed when the limit switch 121 is opened and 131 closed, the bobbin board then comes to rest. Opening of the limit switch 121 breaks the doffing circuit detailed above, and so de-energizes the contactors 102, 125 and opens the switch 91, thereby stopping the motor 126. Closure of the limit switch 131 re-energizes the contactor 102, thus maintaining the main motor inoperative, and energizes the contactor coil 132, both through the following circuit:- +ve line 137, auxiliary contacts 1121, contactor 102, limit switch 131 contactor coil 132, normally closed relay contacts 134, contact bar 127, limit switch 129, -ve line 108. Energization of the contactor coil 132 raises the contact bar 132<2> and closes the switch 92 for the auxiliary motor 133 which controls the movements of the bobbin slide. The motor 133 starts to move the bobbin slide holding empty bobbins towards the horizontally disposed spindles. The limit switch 136 immediately closes; the slide continues to move towards the spindles until the limit switch 129 opens, which breaks the last circuit, thus reopening the switch 92 and lowering the contact bar 132<2>, and so stopping the auxiliary motor 133. Lowering of the contact bar 132<2> to normal position completes the following circuit whereby the contactor coil 128 is energized:- -ve line 108, limit switch 107, limit switch 136, contact bar 132<2>, contactor coil 128, second relay coil 135, limit switch 131, contactor 102, auxiliary contacts 112<1>, +ve line 137. Energization of the contactor 128 causes the contact bar 127 to rise, and the switch 93 to close, whereby the auxiliary motor 133 is reversed, and the bobbin slide moved backwards until the limit switch 107 opens, which breaks the last circuit, de-energizes the contactor coil 128 and opens the switch 93. During this backward movement of the slide, the empty bobbins are threaded on to the spindles. The mechanism is now at rest and the operative can ensure that all the empty bobbins are in position. Actuation of the load button 138 short circuits the limit switch 107, and so causes the contactor coil 128 circuit to be re-made, whereby the auxiliary motor 133 is re-started and the bobbin slide further moved back until it reaches its original position when the limit switch 107 is again closed and the slide is brought to rest by opening of the limit switch 136. Opening of the limit switch 136 (a) interrupts the circuit including the contactor coil 128, which lowers the contact bar 127 into normal position and opens the switch 93, so stopping the auxiliary motor 133, and (b) de-energizes the relay 135, thus making contacts 134 and breaking contacts 140. The relay 135 is fitted with an adjustable time lag device which gives a delayed action between the opening of the contacts 140 and the closing of the contacts 134. Owing to this lag, the contactor coil 128 is de-energized before the relay contacts 140 are broken, and the following loading circuit is completed:- +ve line 137, auxiliary contact 112<1>, contactor 102, limit switch 139 relay contacts 140, contact bar 125<2>, contactor coil 124, contact bar 127, limit switch 129, -ve line 108. Thus the contactor coil 124 is energized and closes the switch 90 which starts up the auxiliary motor 126 in the reverse direction, whereby the bobbin board and empty bobbins is rotated until the spindles are vertical, and is then raised into spinning position; also, the contact bar 124<2> associated with the contactor coil 124 is raised, and the pair of contacts 123 made. Thus the relay contacts 140 are shorted. The time lag device of the relay 135 now permits the relay contacts 140 to open, but as they are shorted by the contacts 123, the loading circuit is maintained. The auxiliary motor 126 raises the bobbin rail until the limit switch 139 opens, when the loading circuit is broken, the contactor coi