Patent GB-112477-A (GB)
Title: Improvements in or relating to Printing Presses.
IPC: B41F13/28
Filed: 1916-11-11
Abstract: 112,477. Anglo-American Inventions Syndicate, (Harris Automatic Press Co.). Nov. 11, 1916. Tripping-arrangements; inking-apparatus.-In a printing-press in which the throw-on of one member or mechanism is followed by the throw-off of another member or mechanism, the first throw-off is effected by a trip mechanism controlled preferably by the interruption of the feed, and the second throw-off is effected by separate and independent mechanism comprising a cam or like operating-member, or the co-operating member for a cam, which is positioned by the displacement of the member first thrown off and is dependent for its action upon a further movement of the press. The invention is particularly applicable to a rotary off-set press in which it is desirable to throw off the inking-mechanism when the ink-rolls are passing over an open space on the forme cylinder, and to separate the transfer cylinder from the forme cylinder when the forme cylinder has completed its transfer to the transfer cylinder. In the machine shown in Fig. 1, the transfer cylinder 14 is automatically thrown off from the forme and impression cylinders 13, 15 simultaneously on failure of the sheet feed, and the displacement of the cylinder 14 moves a cam or lug 61 carried by the cylinder into such a position that, on a further rotation of the cylinder 14, a lever 58 is actuated to throw off the inking-rollers 52. The cylinder 14 is mounted in eccentric bearings 19 held in normal position by toggles 21, 22 connected by a link 25 to an arm 26 of a shaft 27 which is urged by a spring to turn in clock-wise direction to throw off the cylinder 14, but is normally held from turning by a latch 31 engaging a notch in a sleeve 35 on the shaft 27. The latch is released on failure of the feed supply by a trip mechanism shown in Figs. 1 and 11. A shaft 38, oscillated by a link 39 from the shaft of the impression cylinder, carries two notched disks 40 between which is pivoted a trip lever 46, the lower and heavier end of which rests upon and is supported by the sheet on the feed table 36 so that its upper end 49 is held clear of the notches 50 of the disks 40. A sleeve 42, loose on the shaft 38 and having a flange 41 provided with a notch in registration with the notches 50, is provided with an arm 43 in engagement with an arm 44 on the pivot shaft of the latch 31. While sheets are present on the feed table 36, the trip lever 46 oscillates idly, but when no sheet is present, the lower end of the lever 46 drops into a recess 48 in the feed table allowing its upper end to engage the notch of the flange 41 and thereby turn the sleeve 42 so that, through the action of the arms 43, 44, the latch 31 is released and the transfer cylinder is thrown off. The inking-rollers 52 are then thrown-off by the depression of the lever 58 by the lug 61 as stated above, the lever acting through a link 63 to release a latch 66 from a notched collar 68 on a rock shaft 69, to permit a spring 70 to turn an arm 71 carried by the rock shaft 69 and thereby rock a cam 57 engaging the shafts 53 of the inking- rollers 52 and lift them clear of the forme. The inking-rollers and transfer cylinder are thrown on by hand-levers 79, 28 mounted on the rock shafts 27, 69 respectively. In the machine shown in Fig. 4, the throw-off of the inking-mechanism is effected in a similar manner to that in the machine shown in Fig. 1, but the throw-off of the transfer cylinder 14 from the impression cylinder is effected after the separation of the transfer cylinder from the forme cylinder, by means of a second cam or lug 88 on the transfer cylinder acting through a lever 86 to release a latch 89 from a rock shaft 92. In this michine, the excentric bearings 19 are carried in slideable journal boxes 82 connected by toggle arms 96, 93 with the rock shaft 92. The release of the latch 89 allows a spring 94 to break the toggle to permit a spring 84 acting on the journal boxes to move the cylinder 14 radially away from the cylinder 15. In other forms of machine, the transfer cylinder is mounted in excentric or sliding bearings by which it is moved away from the forme cylinder, and the impression cylinder also is mounted in excentric bearings by which it is subsequently moved away from the transfer cylinder, the movement of the impression cylinder and the throw off of the inking-rollers being effected by lugs such as 88, 61, Fig. 4, on the transfer cylinder coacting with levers such as 58, 86. In another form of machine, Fig. 12, the separation of the transfer cylinder 14 from the forme and impression cylinders moves, by means of a lever 137, a lever 142 into the path of a cam or lug 144 on the impression cylinder, the subsequent depression of the lever 142 acting to throw off the inking-rollers 52 as in the machines above described. In another form of machine similar to that shown in Fig. 12, the transfer cylinder is mounted in fixed bearings and the impression cylinder is separated from the transfer cylinder on failure of the feed supply, the movement of the cylinder acting to move a lever such as 142, Fig. 12, into position to be operated by a lug on the transfer cylinder, to throw off the inking-rollers. In all the machines described, the cams or lugs, instead of being carried by the cylinders may be carried by members rotating with the cylinders.