Patent GB-110932-A (GB)
Title: Improvements in or relating to Printing Presses.
IPC: B65H19/18
Filed: 1916-11-06
Abstract: 110,932. Goss Printing Press Co., (Goss Printing Press Co.). Nov. 6, 1916. Driving printing-machines; stopping, starting, and like arrangements.-In an electrically-operated rotary web-printing press, the decreasing diameter of the web roll in use controls electrically-operated mechanism which slows down the press preparatory to the automatic attachment of the lead-end of a new web to the expiring web. In the event of the web breaking either in front of and beyond the printing-couples, rollers normally supported by the web close electrical circuits and stop the press. Means for starting, serving and stopping the press driving motor are also described. The press is shown diagrammatically in Figs. 1, 2 and 3, Figs. 2 and 3 being continuations to the right of Fig. 1. The web passes from either the roll 8 or 10, beneath a web-supported roller 13 or 64 controlling the slowing of the press and beneath websupported rollers 37, 48 which effect the stoppage of the press in the event of a break in the web. A motor 90, Fig. 3, drives the press by known means and is connected to the main circuit wires 95, 96 by a controller 93 and a switch 94. The controller 93 is operated by " on, " " off " and " stop " buttons 132, 133, 134, respectively. The depression of the " on " button closes the circuit of the solenoid 107 which causes the switch 97 to move to connect with the resistance 105 in the armature circuit 92 and the contact 102 in the field circuit 91. At the same time, the circuit of the solenoid 114 is completed across the contacts 99, 100 and the contacts 126, 125, and its core is lifted to bridge the contacts 127, 128 to complete the circuits of the motor 90 through the switch 97. The circuit to the solenoid 130 is also completed to withdraw its core 131 from the path of the switch 97. By depressing the " on " button for a short time only the motor is started slowly. To increase the speed, the button is again depressed, when the switch 97 moves further to the right, cutting out more of the armature resistance 105 and inserting the resistance 103 in the field circuit. To slow down, the " off " button 133 is depressed to complete the circuits to the solenoids 130 and 108 which withdraws the stop 131 and swings the switch 97 to the left. Continued depression of the " off " button stops the press by the return of the switch 97 to its initial position. The press may be stopped immediately by depressing the " stop " button 134 which cuts out the resistance 129, thereby energizing the solenoid 115 which breaks the circuit of the solenoid 114 controlling the motor circuit. The dropping of the core of the solenoid 114 also completes the circuits of the solenoids 130 and 108 to withdraw the stop 131 and to return the switch 97. When the web roll in use, for example roll 8, nears exhaustion, contacts on the bearings of the roller 13, Fig. 1, engage contacts on the box 12 and the solenoid 108, Fig. 3, is energized to swing the switch 97 to slow the press. At the same time the solenoid 113 is energized to break the circuit to the solenoid 130 and prevent the withdrawal of its core 131 which thus limits the movement of the switch 97 and prevents stoppage of the press. The solenoid 130 is adjustable in position to vary the extent of movement of the switch 97 and therefore the slow speed of the press. When the web 10 nears exhaustion, the roller 64 acts in a similar manner to slow the press. Should the web break beyond the printing-couples 35, 36 and 46, 45, the fall of the roller 48 momentarily closes contacts 53, 56 which cut out the resistance 129, Fig. 3, and stop the motor 90 in the same manner as upon the operation of the " stop " button 134. If the web breaks before reaching the printing-couples, the press is similarly stopped by the cutting out of the resistance 129 by the fall of the roller 37, Fig. 2. The invention may be applied to a pluraldecked press by duplication of the necessary parts.