Patent GB-547326-A (GB)
Title: Improvements in or relating to lathes and like machines
IPC: G05B19/06
Filed: 1941-01-03
Abstract: 547,326. Control of several motors. JONES & LAMSON MACHINE CO. Jan. 3, 1941, No. 134. Convention date, Jan. 4, 1940. [Class 38 (iii)] [Also in Group XXII] Machines such as the turret lathe described in Specification 453,192, [Group XXII], have the high-speed drives for the two cam drums derived from separate motors enabling simpler mechanism to be employed. The spindle 31 is driven from the motor 30 by the gearing shown in Fig. 8 and drive is taken from the spindle at 45 through gearing 48 and 61 to drive the cam drums 14 and 25 at low speed together with their auxiliary drums 56 and 65 all as on the prior Specification. The brake 35 is, however, connected to a starting switch Sl provided with retaining means I. 132. The shafts 50 and 62 are directly driven for high-speed running from motors 52 and 68. The clutches for the high and low-speed drives are linked at 556 so that when one drive is in the other is out, complete throw-over being ensured by load and fire mechanism 559. The auxiliary drums carry further dry plates 82, 83 for controlling switches. 36, Fig. 1, is a starting lever controlling the switch Sl and below is a panel containing push button switches ; A being the starting switch for the main motor 30 ; B the master strip switch, E the restart switch, F1, F2 the starting switches for the motors 52, 68, JS, JS1 and JS2 selector switches for these motors for determining constant running or inching, D1, D2 inching push buttons, LS1 and LS2 lead selector switches for these motors that control the sequence in which the motors operate a cycle. Each motor has a magnetically controlled starting switch with an extra contact for closing a holding circuit and the operating coil is in series with the coil of an enclosed relay. The switches controlled by the plate 82 are the stop switch S4 for the motor 52, the starting switch S3 for the motor 68 and a release switch S2 for the starter lever 36. The plate 83 controls the stop switch S7 for the motor 68, the starting switch S6 for the motor 52 and a release switch S5 for the starter lever 36. There is thus an inter-control between the two cam drums, rotation of one drum serving to start the rotation of the other before it stops itself. In addition to the above switches there are also four central relays CR1 to CR4. After starting up the main motor by the button A1 lever 36 co-operated to close switch S1, making a circuit from line 102 through the switch 105 within S2 and S5 and coil 126 to line 101. The relay CR4 then closes, establishing circuit through coil I to latch the starter lever 36 and also, assuming the switches JS1 and JS2 are in the running position, through whichever selector switch LS1 or LS2 is closed to the starting switch 103 of the corresponding motor, and through the switch S4 and relay CR1 or the switch S7 and relay CR2, this closes relay CR3 and the switch 134 closing a maintaining circuit for the coil 167 maintaining the relay CR3 closed independent of the switches LS1 and LS2 and notwithstanding the opening of the circuit at 164 or 203. The operation can then proceed automatically under the control of the dogs on the plates 82 and 83 until both feed motors are stopped at the end of the cycle by opening either the switch S2 or the switch S5. A fresh cycle is started by closing the switch S1 after changing the setting of the switch LS1 or LS2 if required. If the motors are stopped in the middle of the cycles for any reason such as operation of the overload switch of the main motor, failure of voltage, or pressing of the button B, then in order to continue the cycle from the point of stoppage it is necessary to restart the main motor, then to depress the restart button E and hold this depressed while the switch S1 is closed ; this causes the relays CR3 and CR4 to close in the first instance and operation proceeds independently of the selector switches.