Patent GB-352649-A (GB)
Title: Improvements in or relating to printing presses and the electrical drives thereof
IPC: B41F13/004
Filed: 1930-05-22
Abstract: 352,649. Master control of several D.C. motors; controllers. IGRANIC ELECTRIC CO., Ltd., 147, Queen Victoria Street, London, MACKLEY, A. H., 15, Waterloo Road, Bedford, TAYLOR, J. R., Monterey, Uddingston, Glasgow, and STONE, L. N. W., Links View, Perivale, Middlesex. May 22, 1930, No. 15834. [Class 38 (iii).] With auxiliary starting motor.- A printing-press is constituted by unit presses up and folders f, each driven by a main motor mm, and a barring-motor bm. A number of unit presses and a folder are associated by engaging clutches c<1> to connect the presses or folder to a synchronizing shaft s, the requisite sections of which are connected by clutches c2. Unit press-button stations upb are directly associated with the unit controllers uc of the barring-motors, and are connected to a control bus-bar cbb through unit limit switches uls, which close when the corresponding clutches c1 are engaged. Sections of the control bus-bar are interconnected through switches ccs. The mainmotors are connected through switches ucs to a motor bus-bar mbb, sections of which are interconnected through switches mcs, and these motors are controlled in parallel by a main controller mc associated with each folder, and this main controller is controlled by a main pushbutton station mpb. Control of barring-motor of one unit. With the clutch c1 disengaged, momentary closure of " reset " button at associated station upb lights a warning lamp and prepares a circuit for an " inch " button, closure of which extinguishes light and causes motor bm to run as long as button is held closed. Release of this button necessitates reclosure of " reset " button before further inching can be effected. Control of barring-motor of associated units. With the appropriate clutches c1, c2 engaged and corresponding switches uls, ucs, ccs, mcs closed, momentary closure of a " reset " button and continued closure of'an " inch " button at any of the associated stations upb or mpb effects control similar to that for one unit, only all the associated " barring-motors " operate. Control of main-motors of associated units. This control is from station mpb only. As before, the " reset " button must be closed momentarily, then a " fast " button is closed to cause operation of the main controller mc. This controller first causes the barring-motors to start, thereafter the main motors at slowest speed, subsequently the barring-motors are stopped and the main motors are run up to full speed. The action of the main-controller can be stopped at any stage by release of the " fast" button, but can be resumed again without another closure of the " reset button. A " slow " button at the station mpb causes reverse operation of the main controller mc so as to slow down the units until finally they are driven by the barring-motors. " Stop" buttons.-These are placed at each station and are effective to stop all associated units of the press under all conditions of running. " Lock and free " buttons. Those at stations upb can be set so that if the associated units are at rest they cannot be started, whilst that at station mpb can be set whilst the units are running to prevent further speeding up. " Paster" buttons. These are place at the stations upb associated with presses up. If closed whilst the units are driven by the main motors, the main controller is operated so as to slow down the units until only the barring-motors are operating. When the button is reopened the units can be speeded up by the " fast button at station mpb. A " paper-break " switch on each unit up stops all units if the paper breaks, and an interlock between switch uls and ucs prevents associated units being started as a whole if one unit is disconnected for setting-up by disengagement of clutch c1. The main controller is shown in Fig. 2. Field switch FS and then armature switches LM1, LM2 are closed, thereafter a cross-head is raised by a pilot motor over resistance sections 3, 4. After all armature resistance is cut-out, a switch SC is closed to relieve the crosshead of the armature current, and a switch SC1 closes to cause contactor device 8 to accelerate a motor M which drives an exciter G connected in series opposition with the main motor field circuits. Further movement of the crosshead causes the field of the exciter to be strengthened and thus the fields of the motors mm to be weakened. Tracer contacts are associated with the crosshead pilot motor so that the crosshead only stops at definite positions. All the pushbutton circuits, control relays, and circuits for the pilot motor are disclosed in Fig. 4 (not shown). No-volt protection is included, and also change-over switches so that the main-controller can be operated for inspection purposes without the motors being started.