Patent GB-462711-A (GB)
Title: Improvements relating to ink distribution in printing machines
IPC: B41F31/36
Filed: 1935-06-11
Abstract: 462,711. Printing-machines. CRABTREE & SONS, Ltd., R. W., and CRABTREE, J. O. June 11, 1935, No. 35608/34. [Class 100 (ii)] In an inking-apparatus for a rotary printing- machine, the distributing and forme-inking rollers are set into the operative position by fluid-pressure actuated elements whereby the rollers are yieldingly pressed into contact with the distributing drum and printing-surface. The forme-inking rollers are provided with devices for locking them in the set position, and all the rollers are subjected to the action of a throw-off force, which may be provided by fluid pressure or by springs, tending to move them into an inoperative position. Fluidpressure actuated means may also be provided for moving the ink fountain into and out of operative position with the corresponding movements of the distributing and formeinking rollers. Fig. 4 is an end view of a distributing roller bearing and Fig. 6 a side view of a forme-inking roller bearing, these bearings, apart from the locking device shown in Fig. 6, being of similar construction. The journal of the roller rotates in a bore 33 in a bearing 20 of rectangular section which is axially and laterally slidable in an opening 19 in a bush 15 secured in the machine frame 14. A. handle 22<a>, rotatably secured to the bearing 20 by a shank 22 and nuts 26, carries a cross-pin 25, the ends of which normally lie in recesses at the back of a ring 24 secured to the bush and having an opening registering with the opening 19. By turning the handle to bring the ends of the pin 25 'in line with this opening, the bearing can be withdrawn axially to allow removal of the roller. The lateral movements of the bearing 20 to bring the roller into and out of position relatively to the distributing drum or printing surface is effected by a fluidpressure plunger 36 mounted in a cylinder 37 fixed in the frame 14 and connected to a supply pipe 39. The throw-off force tending to move the roller to an inoperative position may be provided by a spring 40, Fig. 4, or by means of a fluid-pressure plunger 52, Fig. 6, having a head 53 engaging a recess in the bearing 20. The plunger 52 is mounted in a cylinder connected by port 56 and union 57 to a pressure supply pipe 58. The locking device for holding the forme-inking rollers in the set position comprises a pair of wedges 65, 66, Fig. 9, arranged between guide surfaces on fixed brackets 60, 61, Figs. 6 and 9, and inclined surfaces formed on the bearings 20. The wedge 66 is connected by a turn-buckle 69 to an eye-bolt 70 pivoted to the lower end of a lever 71 centrally pivoted to the frame, and the wedge 65 is connected by a turn-buckle 75 to a shaft 76 passing through a poppet on the upper end of the lever 71 and carrying a spring 79 between the poppet and a collar 78 fixed to the shaft. A second poppet 77 on the lever 71 has a shank 81 passing through a poppet 85 on the frame, and carrying a spring 86 for moving the wedges to an unlocking position. The wedges may be moved to the locking position manually, electromagnetically or, as shown, by fluid pressure supplied through a pipe 94 to a cylinder 88, the plunger 91 of which bears against the lower end of the lever 71. The ink fountain 12, Fig. 2, carrying the ink supply roller 11 is detachably carried on pivots 104 and is so arranged that its weight tends to lower the roller 11 out of operative position. It is held in the raised position, determined by an adjustable stop, by the plunger of a fluidpressure cylinder supplied from a pipe 119. Fig. 2 shows the general arrangement of a hydraulic control arrangement for a two couple press. A pump 153, driven by a motor 150 and fed from a tank 158, is of the general construction described in Specification 341,667, [Group XXVIII], and has three delivery outlets 155, 156, 157, the pressure in which may be varied as required. The outlet 155 supplies a pipe system 161, 162, 168 directly feeding the pipes 39, 119 for moving the distributing rollers and the ink fountains into operative position, and also feeding, through a valve 273A, the pipes 94 for operating the locking wedges of the forme-inking rollers. This pipe system is provided with a hand - operated control valve 129 leading to the tank 158 for adjusting the normal pressure, and with a release valve 166 which is opened to relieve the system of pressure and allow the distributing rollers to be moved into the inoperative position by the plungers of the throw-off cylinders. These cylinders are constantly under the pressure of fluid in a pipe system 176, 177 supplied from the pump outlet 156. The pump outlet 157 supplies a pipe system 180, 181 which feeds the pipes 39 for moving the forme-inking rollers into the operative position, and is provided with control and release valves 130, 188 similar to the valves 129, 166. The valves 166, 188 are suitably mounted in one casing and opened simultaneously by an electromagnet against the action of valve-closing springs. The pipes 94, controlled by the valve 273A may be exhausted to the tank 158 through a valve 273 and the valves 273A, 273 are interconnected so that when one is open the other is closed. During normal running conditions, the valve 273 is held closed and the valve 273A open by means of an electromagnet. The electromagnets for controlling the valves 166, 168, 273 and 273A are actuated by relays in circuit with the main driving motor of the press and with a device, such as that described in Specification 388,741, for controlling the press upon breakage of the web, so that when the press is stopped, the valve 273A is closed and the valves 273, 166, 188 are opened to unlock the forme-inking rollers, and allow these rollers and also the distributing rollers and the ink fountains to move to the inoperative position. When the valves 166, 188 are again closed the rollers are reset with the predetermined pressure into contact with their co-operating surfaces, and the ink fountains into their predetermined positions. Specification 331,570, [Class 100 (ii)], also is referred to.