Patent GB-191215969-A (GB)
Title: Improvements in and relating to Trip Mechanism for Rotary and like Printing Presses.
IPC: B41F13/28
Filed: 1911-09-04
Granted: 1912-09-04
Abstract: 15,969. Linotype & Machinery, Pearce, H., Parker, T. R. G., and Wright, F. W. Sept. 4, 1911. Tripping-arrangements; inking - apparatus.-A two - revolution rotary press is constructed with means for tripping the impression cylinder so as to cause it to be automatically tripped and untripped by the forme cylinder during each revolution thereof, and with means whereby it may be permanently tripped as long as the attendant or feeder requires. The machine mav be an offset one. The tripping- means for the impression cylinder may be combined with mechanism for tripping the inking - rollers at the proper intervals to avoid double inking. Asshown, the impression cylinder 1 of an offset press comprising also an offset cylinder 2 and plate cylinder 3 is arranged to be tripped and untripped during each revolution of the forme cylinder by rotating its eccentric bearings 21 by means of connecting-rods 19 connected to arms 18 on a shaft 12, which is normally oscillated from a cam 4 on the plate cylinder 3 by the following mechanism. The cam oscillates a sector 8 which engages a quadrant 9 freely mounted on the shaft 12. An arcual recess, at the ends of which are abutments 10, 11, is formed integral with the quadrant 9, and the abutments 10, 11 normally engage alternately with a spring - controlled pivoted pawl 14 and a fixed shoulder 17 on an arm 13 fixed to the shaft 12, so that normally the shaft 12 is oscillated by the quadrant. The pawl 14 may be moved away from the abutment 10, for tripping manually, by means of a cam 22 freely mounted on the shaft 12 and operated by depressing a pedal 24. The cylinder 1 is thus held out of operative position as long as desired, the pedal rod being formed with a projection 33, which may engage the underside of the foot board 26 to lock the pedal in the depressed position. The pedal 24, when depressed, is also arranged to actuate mechanism for tripping the inking-rollers 37 of the cylinder 3. These rollers are moved to and from the plate cylinder 3 by known mechanism operated by a ring 70 with slotted arms 71, the ring 70 being operated by lever-and-link mechanism 69, 68, 67, 86, 85, 82 under hand control, or automatically, from the cylinder trip, by a link 63 actuated by a pawl plate 58 loose on a shaft 42, which is oscillated from a cam 38 on the shaft of the cylinder 3 by the following mechanism. The cam 38 oscillates, through a lever 39 and link 40, a pawl-plate 41 loose on the shaft 42, the plate 41 being formed with abutments 43, 44, adapted to be engaged by one of the noses of a double pawl 46 on an arm 45 fixed to the shaft 42, which arm 45 is under the control of a grooved arm 47 fixed on a shaft carrying another fixed arm 52 controlled by the pedalactuated rod 49 and springs 50, 73. When the pedal 24 is depressed, the rod 49 moves to the right, and the pawl 46 is moved so as to cause its left nose to engage the abutment 43, and the pawl 46 and its arm 45 are moved to the right, and the shaft 42 is thus rotated. The pawl plate 58 is simultaneously rotated by means of a pawl 55 on a second arm 53 fixed to the shaft 42, the pawl 55 engaging a. shoulder 62 on the pawl plate 58. The pawl plate 58 and link 63 thus act to trip the inking-rollers, and they remain in this position as long as the pedal is depressed. When the arm 53 reaches its extreme position to the right, a second pawl 54 on the arm 53 is brought into engagement with the recess in the pawl plate 58 so as to be ready to engage an abutment 61 on the plate to return the parts to inking position. The pawl 55 is tripped by an adjustable stop 81, and a spring 76 holds the arms 53 and consequently the shaft 42 in this terminal position, a similar spring 77 for holding the arm in the other terminal position pulling at this time across a dead-centre and being therefore inoperative.