Patent GB-190410784-A (GB)
Title: Improvements in Printing Machines.
Inventor: LOCK WILLIAM HENRY
Filed: 1904-05-10
Granted: 1905-04-13
Abstract: 10,784. Lock, W. H., and North, T. M. May 10. Cylinder machines with plane printing- surfaces; rotary machines ; stopping and s t a r t i n g arrangements.- Printing- machines, especially those for multicolour work, have s e v e r a printing- couples driven from the same shaft, either in phase for multicolour work, or separately as single printing-machines. Also the trip motion of the first machine, when working with the others, is made to actuate the trip motions of the succeeding machines at the right intervals corresponding to the rate of travel of the sheet. Each machine, Fig. 1, is driven from a shaft 8, through bevel gearing and clutch. When printing in series, the " one-point " clutches 9, 11, &c. drive the machines in phase with each other. When working separately, the friction clutches 10, 12, &c., independently controlled from the opposite or feeder side of the machines, drive the printing-couples. Each machine has a separate tripping-lever 5, 6, &c., controlled Ly a spring 30, to work the tripping-mechanism, not shown. On the first machine, the lever 5 is controlled by a pedal 31, and the motion of this lever actuates a sliding rod 27 through a link 32 and bell-crank lever 33. Assuming, for example, that the first machine is untripped by the upward movement of the pedal 31, the rod 27 will be moved to the right, and at its other end will actuate a bell-crank lever 36, Fig. 3, under the second printing-couple, and through a link 37 will cause the head 39 of a bellcrank lever pivoted on a pin 40 to engage with a lug 59 and shift the pivoted pawl 56 into engagement with a ratchet-wheel 52. The pawls 55, 56 and lugs 58, 59 are in one piece, pivoted to a lever 48, reciprocated about the pin 40 by a cam 43, a lever 41, and a link 47. The pawls 55, 56 may engage with mutilated ratchet-wheels 52 respectively, both of which have teeth round only half their circumference, depending in number upon the number of revolutions the impression cylinder of the second machine makes before the sheet about to be fed to the first machine has passed to the same relative position on the second printing- machine. Both wheels are fixed to a cam 49, the motion of which is resisted by a spring-controlled brake. This cam is therefore moved through half a revolution, until the pawl 56 engages with the plain part of the wheel 52, and thereby allows the tumbler 64, adjustably connected through the arm 65 to the trip lever 6, to move upwards, and the second machine is tripped. The upward movement of the lever 6 actuates the next trip motion in a similar manner through a rod 28. The machines are tripped in a similar manner, the pawl 55 and wheel 52 then coming into action. To allow each machine to be also independently tripped, the lever 6 may be merely pivoted on its shaft, and a second lever, controlled by the spring 30 and fixed to the shaft, may lie alongside the lever 6 and be actuated by it through a stop fixed to the second lever, and passing under the lever 6. Feeding sheets. - In side lay apparatus for printing-machines, in which a bracket 79, Fig. 19, carrying a bevelled foot 75 to pass under the sheet 76 and a vertically-movable guide 108 to pass above it, is moved transversely against the side edge of the paper. A plunger 116, pressed downwards by a spring 124 and normally held away from the paper by a lever 130 and catch 134, is then released, and holds the paper against the foot while the slide is moved back and correctly positions the sheet. The plunger is then lifted. The bracket 79 is adjustably fixed to a slide 82, actuated by a cam 92 on the shaft 107, working against a tumbler 91. The adjustable spring 94 retracts the slide, a stopscrew 102 limiting its inward motion. The plunger 116 is lifted, when the slide 82 is in its inward position, by a cam 133, which depresses a slide 131 through a tumbler and thus brings the end of the lever 130 under the catch 134, which is again released on the outward stroke by the lever 136 engaging with the cam 135. The slide carrying the guide 108 is in two parts 118, 120. The part 120 is pressed downwards by a spring 127, and has a stop 128 to limit its downward movement. The lower part 118 is adjustably coupled to the upper part by the screw 114, clamped in its adjusted position by a screw 122. The vertical slide, with the guide 108, is actuated by the plunger 116, a certain amount of play being left between the two so that the guide 108 is lowered before, and raised after, the plunger 116. The boss 100 of the cams 92, 135, 133 is slidably connected to the shaft 107 by a feather or similar means, so that the whole apparatus may be laterally adjusted and clamped to the feed-board 93. The shaft 107 is reciprocated by a rotating cam and levers.