Patent GB-866127-A (GB)
Title: Improvements in or relating to electric motor control systems
IPC: B41F13/004
Filed: 1958-08-06
Abstract: 866,127. Control of several motors; controllers. IGRANIC ELECTRIC CO. Ltd. Aug. 6, 1958 [Aug. 6, 1957], No. 25181/58.  Class 38 (3). A printing press, comprising printing units 1-4 interspersed between folders A, B and C, is provided with a controller assembly 32 located remotely from the press and connected to control stations and selector switches located at the units and folders. In order to set up the press for operation of units 1, 2, into folder A and units 3, 4, into folder B, clutches are operated to couple motors M1, M2 with motor MA and motors M3, M4 with motor MB. Supervisory switches 78, 80, 82 and 84 are positioned to energize selector switches 24, 26, 28 and 30 whereby the control stations at units 1 and 2 are transferred to bus-bars 48, whilst the control stations at units 3 and 4 are transferred to bus-bars 50. Auxiliary selector switches 54, 56, 58 and 60 are also energized to transfer power contactors 36, 38, to bus-bars 48 and power contactors 42, 44, to bus-bars 50. The motors MA, M1 and M2 are started by closing a switch 18 at the control station at either folder A, unit 1 or unit 2. If the starting switch 18 at the control station for folder A is closed, for example, the power contactor 34 is energized and the motor MA is started, followed by the motors M1 an M2. The units 3 and 4 are started with folder B in a similar manner. The group MA, M1 and M2 may be stopped from the control station at unit 1, for example, by closing switch 20 to short-circuit solenoid 102 and open the contactors 34, 36 and 38. Inadvertent starting of the group is prevented by closing safety switch 22 at any of the control stations. By moving the supervisory switch 78 to its neutral position, the motor M1 may be shut down, but the remaining motors MA, M2 may be maintained in operation, if so desired, under the control of the stations at folder A or unit 2. If a fault develops at the supervisory switch 78 or at solenoid 62, the selector switch 24 may be actuated manually by means of lever 69, Fig. 5 (not shown), so that all the motors MA, M1, M2 may continue to operate. A unit is prevented from being mechanically coupled to one folder while being operated electrically from another folder, clutch-operated switches 116-126 and solenoid 198 being provided for this purpose. Disconnecting switches 217 permit selective isolation of a folder control station without otherwise affecting the operation of the group. Similarly, the folder motors may be selectively de-energized by switches 219 without affecting the operation of the printing unit motors which continue to drive the folder. A modification of the control system allows greater capacity for printing colour, an additional selector switch being provided to by-pass folder B and thereby allow units 1, 2, 3 and 4 to be operated as a group into folder C, Figs. 3, 4 (not shown). The press is set up for operation by opening clutch A-1 and closing clutches 1-2, 2-B, B-3, 3-4 and 4-C, the bevel gears 12 at folder B being disengaged. The drive motors are prevented from starting if the motor MA is inadvertently coupled to the motor MC.