Patent GB-190505059-A (GB)
Title: Improvements relating to the Application and Distribution of Electric Motive Power particularly for use in Starting Machinery and for similar purposes.
Inventor: MASCORD GEORGE WILLIAM
Filed: 1905-03-10
Granted: 1906-05-10
Abstract: 5059. Mascord, G. W. March 10. Driving machines by electromotors. - Machines such as printing-presses, requiring a heavy starting - torque and driven from a continuouslyrotating motor, as described in Specification No. 727, A.D. 1904, are brought up to normal speed by means of a system of clutches controlled by a band-lever, higher speeds being obtained by cutting resistances into the motor field. Pneumatic, hydraulic, and d electric arrangements a r e described for operating the lever controlling the clutches and field resistances. Fig. 1 shows the invention applied to a rotary printing-press formed in two parts or to two presses, only one of which is shown. Each part of the press is driven by a centrally - disposed electromotor m, and the same gearing is duplicated for the other part. The controlling-gear need not be duplicated as the two parts may be coupled together, for example, by the shaft m<12> and the coupling m<13> thereon, but, if it is desired to control each part separately, two sets of controlling- gear may be provided. At starting, the motor shaft a drives the press mechanism through a slow-motion shaft c and gearing k, j<1>, j<2>, while in normal working the shafts i, a are coupled through a friction or other clutch b. The shaft c is driven from the shaft a through relucing-gear, which may consist of bevel pinions l<1>, l<2> and worm gearing l<3>, l<4>, the latter wheel being loosely mounted on the shaft c. The wheel l<4> is provided with a number of spring pawls l<5>, Fig. 1<b>, engaging with a boss 1<6> fixed to the shaft c. Abnormal movement of the shaft c in the direction of driving is thus permitted by the slipping of the pawls over the recesses or teeth on the boss l<6>. The shaft c may be driven by an auxiliary motor. In a modification, the shaft i is situated at right, angles to the motor shaft a, and is driven therefrom through bevel-gearing and a friction clutch b. When the pivoted operating-handle 9 is moved from the position x, a tripping-pawl n' thereon releases a bellcrank lever n<2>, which, under the action of a weight n<3> and through the link n<1> and bell-crank lever n, disengages a boss d<2> keyed on the shaft c from the clutch d', the pinion k to which the part d<1> is fixed riding loose upon the shaft c. At the same time, the clutch b is operated by the handle g through the pin g<1>, cam o, bell-crank lever o<2>, and links o<3>, o<4> to couple the shafts a, i, the handle being locked in the position v by the part o' of the cam. Further movement of the hand-lever g switches sections of the resistance s into the shunt-field circuit m<1> of the motor m, suitable contact-studs p being provided to engage with a contact-piece p<1> on the lever g. A connecting-rod e may be attached to the lever g by which corresponding movements may be given to a second set of controlling-apparatus provided on the second part of the press or upon the second press. Motion is also communicated from the countershaft j through the shaft m<12> to a complementary countershaft and similar gear at the other side of the machine. A controller r is provided, with contacts 1 ... 10 and with a magnetic blow-out r'. When the slow-motion shaft c is driven by an auxiliary motor, the switch arrangement, shown in Fig. 4<a>, is employed to cut out the motor upon the lever g passing the position x. A spring-pressed, toothed segmental lever y is tripped by the lever g, and moves the lever y<3> over the switch contacts. The lever g may be operated through the toothed gearing g<3>, Fig. 1, by the movement of a piston h in a cylinder h<1> which is supplied with compressed air from a reservoir h<4> through a three-way valve h,<2> and a stop valve h<7>. The pressure of the air in the reservoir is maintained constant by means of a pump h<5> driven by an eccentric h<6> on the shaft a. The compressed air may be supplied through a pipe h<8> from an independent source, or led to the controlling-mechanism of the second part of the press. Fig. 1<a> shows an arrangement of air-pipes for the two parts of a press, or for two presses, whereby both sets of controlling-mechanism can be operated together or one at a time from the same source. Branch pipes x' lead to the three-way valves h' from the general supply pipe x, and the pipes leading from the valves h<2> to the cylinders h<1> on the two sides are cross-connected as shown. Special supply pipes x<2> may be connected to a compressor operated from the mechanism of the press in the manner before described. Stop valves x<3>, x<4>, x<5>, x<6> are provided. The hydraulic apparatus for operating the lever g is shown in Fig. 2. Pressure is transmitted to the cylinders h<11>, through the valves t, t<1>, under the control of the lever u, t<2> being exhaust pipes and t<3> supply pipes. The lever g may be operated electrically, the pistons g<41> forming the cores of two solenoids, each consisting of five coils connected to contacts over which is rotated a contactarm to place the coils successively in circuit. According to the Provisional Specification, the lever g may be operated by a small electric motor through worm gearing.