Patent GB-126815-A (GB)
Title: Improvements in Inking Mechanism for Printing Machines.
IPC: B41F31/08
Filed: 1918-05-21
Abstract: 126,815. Hoe & Co., R., (Hoe & Co., R.). May 21, 1918. Inking-apparatus. - Relates to inking-apparatus for printing-presses of the general type shown in Specification 20195/14, in which the ink is delivered from a supply reservoir to the distributing-cylinder by a series of conduits which are supplied with ink . by a corresponding number of pumps, so that the supply to each column or section of the forms mav be varied, and consists chiefly in the employment of valveless pumps and in an improved construction and arrangement of the means for regulating the ink supply. As shown, each distributing-cylinder C, Fig. 2, of the press is supplied with ink from a container F and the containers F are supplied with ink from a main I through which ink is continuously circulated from a main reservoir bv a pump. A float-controlled valve keeps the ink-level in container F at a constant height. A number of conduits E. one for each column or section of the printing formes, delivers the ink to the cylinder C and each is supplied by a valveless plunger pump within the container F. Fig. 6 shows a cross section of the container F, showing two pumps. The plungers 10 work in cavities formed in bars 11 connected bv cross bars 12 which are formed with vertical members 12<a> which embrace an eccentric 14 and also serve as guides to downward projections 15 of a bar 16. The eccentric 14 is carried by a shaft 13 which is rotated by gearing 28, 29, 30 from a drive shaft 32 so that the bars 11 and 16 are reciprocated sideways and the bar 16 is also reciprocated vertically. The bar 16 has arms 17 by which the plungers 10 are depressed to force a supply of ink through the conduits E, and the plungers are raised by toe pieces 21 of arms 20 freely mounted on shafts 19 but adapted to be held in various positions to vary the stroke of the plungers by means of catches 2 engaging racks 24 secured to the bar 16. The arms comprise two telescopically connected parts pressed apart by springs. The arms 20 have heads 23 numbered to correspond with the columns or sections of the frames supplied by the pumps. The gear 30 is secured to a sleeve 31, Fig. 7, loose on shaft 32 'but adapted to be clutched thereto by engaging a projection 35 of a handle 34 with a notch in a disk 36 keyed to the shaft 32. By turning the handle into a position at right-angles to that shown, the sleeve is released and may be turned by the handle 32 to drive the pumps manually if desired. The delivery ends of the conduits E are carried by a frame D, Figs. 2 and 8, adjustably carried by the press frame by means of bolts 49 carrying nuts 50 and springs 52. The conduits deliver the ink into passages 46, the width of a column or section of the forme, in a bar 47 secured to the front of the frame D and the ink passes through small upwardly directed orifices 4 and flows down an incline 5 on to the cylinder C. Fig. 13 shows a modified construction of the container F in which the pump plungers 10 are operated by separate eccentrics. The bars 11 are connected by cross-bars 54 in which slide blocks 55 operated by ecentrics 57 so that the blocks 55 receive a sideways reciprocation to move the bars 11 alternately into pump suction and delivery positions. The plungers are carried by members 59 and are reciprocated vertically by the engagement of eccentric straps 56 with heads 63 of screws 61 carried by the members 59. The screws 61 are vertically adjustable to vary the stroke of the pump, and are held in adjusted positions by springs 62. Single valves 69 controlling a series of conduits E, such as those supplying a page of the forme are provided whereby such series may be cut out simultaneously.