Patent GB-191511684-A (GB)
Title: Improvements in Controlling Mechanism for Printing Presses Operated by Electric Motors.
IPC: B41F3/80
Filed: 1915-08-12
Abstract: 11,684. Goss Printing Press Co., [Goss Printing Press Co.]. Aug. 12. Driving printing - machines.-An electric motor drives a printing- press at low speed through reducing-gear, or at high speed, and the high-speed clutching mechanism is operated by an auxiliary motor controlled by electromagnetic switches. The gear of the press meshes with the wheel 11 keyed on the main shaft 9 of the controlling mechanism. The wheel 12 is loosely mounted on the shaft 9 and carries the ratchet part of a clutch, the pawl member 14 of which is keyed to the shaft 9. The motor 26 drives the press at low speed through the gearing 24, 23, 20, 19, 16, 12 and the ratchet clutch. At high speed, the shaft 9 and the press are driven through gearing 24, 23, 27 and the friction clutch 28, 29. The pawls of the ratchet clutch are thrown out by centrifugal action. The movable member 29 of the friction clutch is connected by links to a fork hanging from the shaft 30, which can be rocked slowly in either direction by an auxiliary motor 37 to put the clutch in or out. One of the gear-wheels of the auxiliary motor carries a disk 40, Fig. 7, provided with contact segments 41, 42 working under brushes 43, 44. Automatic action is obtained by means of electro-magnetic switches under the control of " on," " stop," and " slow " buttons A, B, C respectively. The depression of the button A closes the circuit of the solenoid D. This causes the arm 60 to move to connect with the resistance 64b in the motor armature circuit and the contact 65<a> in the field circuit. At the same time, the circuit of the solenoid G is completed across the contacts 66<a>, 67<a>, and its core is lifted to bridge the contacts 78, 79 to complete the circuit of the motor 26. The motor 26 then starts at low speed and drives the press through the low-speed mechanism. If the button A is held depressed, the arm 60 moves to cut out resistance from the armature circuit and also to make contact with the contact segment 63<a>, thereby completing the circuit of the solenoid H including the contacts 41, 43. Operation of the core of the solenoid H completes the circuit of the auxiliary motor 37, which runs to put in the high-speed clutch 28, 29. When this is done, the contact 41 passes from beneath the brush 43 and breaks the circuit of the solenoid. The motor 26 then operates the press at high speed, and this may be increased by still depressing the button A and causing the arm 60 to cut in field resistance. To slow down, the button C is depressed to complete the circuit of the solenoid E to cause the arm 60 to retrace its movement. As the arm moves back, the contact e<1> bridges the contacts 48, 49 and completes a circuit including contacts 42, 44 and the solenoid I. The solenoid core is lifted to complete a circuit for the auxiliary motor 37, causing it to run back to take out the highspeed clutch. Continued depression of the button C stops the press by the return of the arm 60 to its initial position. A special stopbutton B is provided, and, when depressed, it short circuits the resistance 71, thereby permitting the solenoid F to raise its core to break the circuit of the solenoid G which controls the main circuit. Specification 26,633/10 is referred to.