Patent GB-222988-A (GB)
Title: Improvements in or relating to means for washing lithographic printing surfaces
IPC: B41F35/02
Filed: 1923-07-20
Abstract: 222,988. Linotype & Machinery, Ltd., and Goulding, B. J. J. July 20, 1923. Printing-surfaces; damping-apparatus for lithographic machines; inking-apparatus.-In a rotary lithographic printing-press having a number of plate cylinders, each plate cylinder is provided with a washing-mechanism comprising a roller or pad supplied with washing fluid from a trough, and the washing-mechanisms of all the cylinders are interconnected so that they may be individually or collectively brought into or out of - operation. The washing-mechanisms may also be interconnected with the trip-mechanisms of the damping and inking apparatus. The washing- mechanisms may comprise rollers 7, 8, Fig. 1, or pads 29, Fig. 2, these rollers and pads being constructed and operated as described in Specification 221,566. The rollers 7, 8 of each plate cylinder are mounted in arms 9, 10 pivoted about the shaft of the drum 6 which supplies cleaning fluid to the rollers from the trough 5, and the arms 9, 10 are operated by a hand-lever 17 through arms 13, 14 and links 11, 12. Links 21, pivoted to extensions of the arms 13, are connected to arms 22 fast on sectors 23 loose upon shafts 24 on which are also loosely mounted handlevers 25 having arms 27 connected together by a link 28. The levers 25 carry spring plungers 26 adapted to engage recesses in the sectors 23 and, when both levers 25 are thus locked to the sectors, operation of either hand-lever 17 results in the simultaneous movement of both washing- mechanisms into or out of operative position. Individual operation of the washing-mechanisms may be effected by disconnecting either of the plungers 26 from the sectors. In the construction shown in Fig. 2, the washing-pads 29 are carried by a square shaft 31 mounted in arms 32 pivoted to arms 33 which are oscillated about the shaft 34 of the plate cylinder 2 by eccentrics 37 and rods 39 as in the Specification referred to above. The pads are held in contact with the cylinder by a spring 42 on a rod 43 pivoted to an arm 41 fast on the shaft 40 to which the arms 32 are secured. An extension 50 of the arm 32 carries a roller 49 engaging an arcuate surface on an arm 48 on a shaft 46 provided with a hand-lever 47. In the position shown, the roller 49 runs idly on the arm 48 during the oscillation of the pads but upon depressing the lever 47 the pads are moved out of engagement with the cylinder 2. To enable collective operation of the pads of all the plate cylinders, the shaft 46 of each mechanism is provided with an arm 51 carrying a pin 52 engaging a slot 53 in a link 54. The links 54 are connected through bell-crank levers to a common actuating-rod operated by a handlever to raise the links 54 simultaneously and thereby operate the arms 48. This hand-lever and also the hand-levers 17, 47 may be caused to close an electric circuit to operate an audible or visible indicator when the washing-mechanisms are moved into operative positions. The slots 53 permit of individual operation of the levers 47. Fig. 4 shows means for interconnecting the washing-mechanism with the mechanism for tripping the damping-rollers 74, 75 and inking-rollers 67. The rollers 67 are tripped by a hand-lever 73 through a link 79, lever 80, and pivoted plates 81 carrying the rollers, and the damping-rollers are tripped by a hand-lever 82 acting through linkage similar to that of the washing-mechanism. The arms 13, 14 are provided with pins 68, 69 engaging slotted links 70, 72 connected respectively to an arm 71 on the shaft of the lever 82, and to the lever 73 so that when the lever 17 is actuated to move the washing-mechanism into operative position, the link 70 is raised and the link 72 lowered to trip the damping and inking mechanisms. The pins 68, 69 may be removable to allow all the mechanisms to be individually operated. Foot-operated devices may be employed instead of hand-levers for actuating the various mechanisms. The Provisional Specification describes also a construction of washing-mechanism wherein an intermediate roller transfers fluid from the trough-roller to a washing-roller mounted in a pair of arms which may be rocked about the axis of the intermediate roller by a hand lever. One of the arms is provided with a pin engaging a slot in a vertical link, and the links of the washing-mechanisms of the various cylinders are connected together for common actuation to move the washing-mechanisms into and out of operation simultaneously.