Patent GB-190527242-A (GB)
Title: Improvements in or relating to the Control of Electric Motors.
Inventor: CLATWORTHY WALTER ANGOVE
Filed: 1905-12-30
Granted: 1906-04-26
Abstract: 27,242. Chatworthy, W. A., Holmes, A., Holmes, J. H., Holmes, L. W., and Holmes, E., [trading as Holmes & Co., J. H.]. Dec. 30. Driving machines by electromotors.-In the control of electric motors for driving rotary web printing- presses and the like, the controller is driven by a pilot motor under the control of push-button switches distributed about the press, the system of control being especially applicable to the invention described in Specification No.9802,A.D. 1898, in which the press is started and driven at a low speed by an auxiliary motor driving through the shaft of the main motor, and the auxiliary motor cut out of circuit when the main motor has run up to speed. By closing the push-button switch a at any one of the push centres A, B, C, D, E, F, the circuit of the solenoid 22 is completed from the main 8 through the lead 9, distributor bar 10, lead 11, push a, lead 12, distributor bar 13, lead 14, spring jaws 15, lead 16, contacts 17, 18, 19, switch 28, and the contacts 24, 25, 26 to the main 27. The core 29 rise, and opens the switch 28, thereby shunting the current through the indicating-lamp 21, and at the same time lifting the contacts 30, 31 from engagement with the contacts 32, 33, 34, 35 into engagement with the contacts 32a, 33<a>, 34a, 35a, and so completing the circuits of pilot series motor N, which drives through worm gearing the screwed shaft 1, on which is mounted a nut 2 carrying the contacts 3 of the controller K for regulating the auxiliary and main motors L, M. As the nut 2 moves to the right, the interrupter 4 is withdrawn from between the contact-jaws 5, which come together and complete the circuit of the solenoid 51. The switch 57 is opened and the current shunted through the lamp 52, and the contact 59 brought into engagement with the contacts 61, 39 to complete the circuit of the resistance 63 in parallel with the field winding 41 and so to accelerate the motor N. Further movement of the nat 2 brings the striker 2<a> into engagement with the projection 64 to open the switch 54<a> and close the switch 54<b>, which is he'd closed by an electro-magnet 65. When the nut 2 has reached the limits of its travel, the interrupter 4<a> enters the jaws 15 and, breaking the circuit through the solenoid 22, stops the pilot motor N. The nut 2 may be stopped at any point of its travel by relaxing the pressure on the button a and thus opening the circuit of the solenoid 22. To reverse the direction of rotation of the motor N, the solenoid 73 is energized by depression of a button b. The core 76 in rising breaks the circuit of the solenoid 22. The core 29 falls, breaking the circuit of the motor N at the contacts 32<a>, 33a, and completing the circuit with the armature connexions reversed at the contacts 32,33. When the nut 2 reaches its extreme lefthand position, the circuit of the solenoid 73 is broken at the contacts 5, and the core 76 in falling breaks the circuit of the motor N at the contacts 43a, 45<a>. In its travel to the left the striker 2<a> opens the switch 54b and closes the switch 54a, the effect of which is to excite the solenoid 51 and connect the resistance 63 in parallel with the field winding 41 so that the motor N will be accelerated during the latter part of the travel of the nut 2. The press may be stopped at any moment by depression of a button c and so short-circuiting the magnet coils, which hold the switches on the controller K closed. If a button b is depressed at the same time as a button c, the resistance 63 and field winding 41 are placed in parallel and the pilot motor N is thus rotated at a high speed to return the nut to its initial position. When one of the switches 3 is closed, the solenoid 87 is energized and the circuit under the control of the buttons a opened, the circuits containing the buttons b, c being in no way affected. The lamps 52, 72, 21, 91, which indicate which button or switch is in operation, may have distinct colours and be distributed about the press.