Druckerpresse

摘要

1,187,841. Printing apparatus. HARRISINTERTYPE CORP. 21 March, 1967 [22 March, 1966], No. 13149/67. Heading B6C. [Also in Division B8] A multi-colour rotary offset printing machine having a plurality of units A-C comprises electrical control means for each unit for actuating electro-responsive means to trip the units on or off; signal producing means operating in synchronism with the machine and providing a plurality of timing signals in sequence, and signal responsive means connected to the output of said signal producing means to distribute the signals to the electrical control means to operate the electro-responsive means of each unit in different machine revolutions and independently of the control means of the other units so as to trip the units in the proper sequence. The signal responsive means includes first counting means for counting and distributing timing signals to throw the units on in sequence and second counting means for counting and distributing said timing signals to throw said units off in sequence. Each electro-responsive means comprises a plurality of electro-responsive devices to be actuated in a predetermined sequence to throw the respective printing unit on or off and the signal producing means has a first output providing a revolution signal for each revolution of the machine and a second output providing phase signals at the time within each revolution that an electro-responsive device is to be operated. Means may be provided in the circuitry for over-riding the timing signals. Sheet-feeding.-The machine includes circuit means for throwing off the units in response to the detection of a loss of a sheet at the front stops of a feed board on either the feed side or the gear side of the press, said circuit means comprising gating means and means responsive to the detection for setting the first counting means to a predetermined count to start conditioning the gating means to throw off or trip the units in sequence beginning with the one following the position at which the sheet absence is sensed. The circuit means also includes means for stopping the sheet-feed in response to the detection of sheet absence between the units and for effecting operation of the second counting means to throw or trip the units. Rotary printing machines.-The machine includes three plate cylinders 10A, 10B, 10C, with corresponding offset cylinders 12A, 12B, 12C, and impression rollers 13A, 13B, and 13C. Damping and inking mechanisms are provided for each unit. The sheets are conveyed between the units by double-size transfer cylinders 23 each having two sets of gripping mechanisms thereon. The mechanisms act alternately to transfer the sheets. The cylinders 23 rotate at half the speed of the cylinders 13A, 13B &c. Inking and cylinder trips.-The inking and impression trips are individually controllable by apparatus including a cam (30), Fig. 2 (not shown), and solenoids (S), (S1). The energization of the solenoids is controlled by static logic circuitry operated in response to pulses from, for example, a pulse generator (55), Fig. 5B (not shown). The offset cylinders and the inking rollers may be automatically tripped after a predetermined number of press revolutions.