Patent GB-218001-A (GB)
Title: Improvements in or relating to printing presses
IPC: B41F13/28
Filed: 1923-03-28
Abstract: 218,001. Anglo-American Inventions Syndicate, Ltd., (Harris Automatic Press Co.). March 28, 1923. Tripping-arrangements; inking-apparatus. - A printing-machine of the kind described in Specification 112,477 is constructed with means for tripping the printing members which also sets means for subsequently tripping the inning-rollers at an adjustable period in the working of the machine, each tripping device being operated by a cam which is independently adjustable on a common shaft. The arrangement is such that the inking-rollers can be tripped by independent handoperated mechanism, and the tripping means for the printing members is preferably controlled by feeler mechanism which comes into operation when the sheet is absent. As applied to a rotary offset machine comprising an impression cylinder 11, offset cylinder 10, and plate cylinder 9, the impression cylinder 11 is mounted in eccentric bearings which can be rotated to trip this cylinder by a treadle 31. The offset cylinder 10 is mounted in eccentric bearings 16 and the tripping of the cylinder 10 is controlled bv an arm 17 connected to compound toggle-mechanism comprising an adjustable link 18, lever 20, and toggle levers 25, 55. The arm 57 of lever 55 is connected by a link 58 to a lever 52, the levers 52, 57 being maintained parallel by the link 58. In Fig. 1, the cylinder 10 is shown in its operative or printing position. The cylinder 10 is moved out of printing position when an adjustable arm 49, carried by a bracket 41 on a lever arm 34, is moved to the right so as to be brought over a plate 53 on an arm of lever 52. The arm 49 then operates the toggle mechanism when it is depressed by a cam 32 on the shaft of the impression cylinder. The levers 52, 57 are moved to the right and the arm 55 moves in a counterclockwise direction to straighten out the toggle 25, 55, and the bearings 16 rotate in a clockwise direction to trip the cylinder 10. The straightening out of the toggles 25, 55 depresses a rod 132 so as to depress a lever 112 which is normally held by a spring-catch in the position shown. The lever 112 is moved down so as to cause a spring- pressed rod 122 to be moved far enough to cause a shoulder 123 on it to engage a pin 124 on a lever 106 connected to the tripping mechanism for the inking-rollers 91. An arm 137 on lever 112 is moved down into the path of a cam 139 which is adjustably connected to the shaft 14 so that the timing of the inking tripping mechanism is adjustable relatively to the tripping of the printing members. The lever 106 operates a lever 104 connected to levers 96, 97 which bear on the spindles of the inking-rollers 91 and move them away from the cylinder 9. The lever 106 can be operated by a hand-lever 111 when it is desired to trip the inking-rollers independently, and this lever is used to reset the inking-rollers. The movement of the arm 49 and lever 34 is controlled by a lever 66, link 68, from a spring-impelled shaft 63 connected by a lever 64 and link 65 to lever 66. The, shaft 63 is normally restrained by a catch 70 engaging a notch in a collar 73 on the shaft. This shaft is disengaged by mechanism controlled bv a freely mounted oscillating lever 76 with a pivoted catch provided with a tooth 88 which is normally prevented by a sheet from operating to disengage the catch 70. If the sheet is absent the catch is disengaged and the offset roller tripped as described. In a modification, the lever 112 can be operated to bring the inktrip mechanism under the action of cam 139 by a hand-operated lever with a catch which is automatically disengaged from the lever arm 137 after it has operated the ink-trip mechanism. The connection between the toggle pin 27 and the notch 133 on the rod 132 is likewise automatically disconnected after the lever 112 is depressed to set the inking-mechanism trip.