Patent GB-340228-A (GB)
Title: Improvements in driving mechanism for printing presses
IPC: B41F13/004
Filed: 1929-06-18
Abstract: 340,228. Driving printing-machines. CLINE, A. J., 111, West Washington Street, Chicago, U.S.A. June 18, 1929, No. 18736. [Class 100 (ii).] In a multi-unit rotary newspaper or like printing- machine in which a number of single printing couples or perfecting sets 12, 14; 13, 15 are arranged at the same level above the supply rolls, and the printed webs may be associated in various ways and led to folding devices 64, independent electric motors are provided for the printing units and for the folders, and the motors can be connected selectively to an equalizing shaft which synchronizes the drives of the printing units and folders. The perfecting sets 12, 14; 13, 15, Fig. 1, are each driven from one motor 24, by sprocket gearing, the cylinders 12 .. 15 being geared together by spur gearing. The cylinders 12, 13, Fig. 2, are each independently driven from separate motors 45, 46 which are mounted on a supporting bracket 42. The folders 64 are driven by sprocket and bevel gearing from the motors 25. Each of the motors is geared to a spiral gear freely mounted on an equalizing shaft 31, and a clutch is provided for each motor so as to connect to the shaft 31 all the motors which are used to drive one of the printing units or one of the folders, thereby synchronizing the drives. Each of the motors 24, 25, which are all preferably of the same type and horse-power, is adapted to be controlled by a controller system shown diagrammatically in Fig. 7, and the controls for the several motors are so related that any selected number of the motors may be operated at a given time and in any selected grouping, and the control may be effected at any one of the controller stations owing to the interconnection of the controllers which are all electrically connected in parallel. A main switch 134 associated with each motor permits the motor to be operated or not when the control buttons 113, 116, 117, 123, 127, of any system are operated. The motor armature 71 of each motor may be connected to a high voltage circuit associated with a positive line 72 and a negative line 73, or to a low voltage circuit including a positive line 74 and a negative line 75, the low voltage circuit being used when plating up the cylinder or threading the web. The control comprises a rheostat, or controller arm 76, which is movable across a combined face plate and armature resistance 77, a field resistance 78, a slow speed segment 79, and a normal running speed segment 81. In the " off " position of the arm 76 it contacts with a reset button 82 and the various contacts which are controlled by electromagnet relays 110, 111, 112, 125, 131, are in the position shown, and there is no current in the motor 71 nor in a pilot motor 92 which acts to move the arm 76 to the right or left in order to increase or decrease the speed of the main motor. To start the motors a " safe " or " run button 123 is depressed, and an " inch " button 113 also depressed, and the circuit to the pilot motor 92 can then be closed by means of an " increase" button 116. This causes the arm 76 to be moved to the left, and when the arm contacts with the segment 79 the armature 71 is thrown in on the low voltage circuit and the press is driven at the slow speed. Further depression of the button 116 moves the arm 76 into contact with the segment 81, and the high voltage circuit is thrown in and the low voltage cut out. Further movement of the arm 76 to the left decreases the armature resistance and increases the speed of the motor. By depressing the " decrease " button 117 the motion of the arm 76 is reversed, and the speed of the motor is decreased, and the drive may be changed to the low voltage circuit. A stop button 127 when depressed causes the arm 76 to return to the reset position on the contact 92 and the motor is stopped.