Patent GB-722329-A (GB)
Title: Inking mechanism
Inventor: GATES ALBERT GEORGE RONALD
IPC: B41L13/18
Filed: 1951-11-16
Abstract: 722,329. Duplicating-machines. GESTETNER, Ltd. Nov. 7, 1952 [Nov. 16, 1951], No. 26968/51. Class 100 (2). Inking-apparatus.-In an inking-mechanism for a twin-cylinder duplicating machine having a piston pump driven with the machine for automatic ink delivery with an adjustable stroke to vary the quantity, the pump piston performs its delivery stroke as a succession of steps during each of which ink is delivered to the inking roller. In the device shown, providing for an ink-delivery impulse at each duplicating operation, an eccentric 11 is driven, through spur gearing 3, 6, from the same motor as the twin drums 2 by an intermittent gear (not shown) giving a one-revolution impulse to the eccentric at a point in each cycle when duplication is not being effected; a 15-tooth star wheel 9 surrounding the eccentric and held against rotation by a fixed pin 14 is thus made to pass once round the interior of a 16-tooth cup wheel 10 whereby the latter is advanced one tooth, transmitting an impulse to a swing- ing lever 21 via a crank pin and connecting rod, or a cam groove 16, follower roller 17 and jointed link 18; the lever 21 is slotted to allow a pin 26 of a further link 27 to be set at a selected distance from the lever pivot 22, the link 27 being connected by a pin 30 to a swing- ing plate 31 coupled by a pin 33 to, and sharing a fixed pivot screw 32 with, an arm 34 whose finger 35 operates the piston 36 of an ink pump 37 constructed and mounted as described in Specification 655,550. Alternatively the link 18 may be connected directly to the arm 34, its pivot 19 being adjustable in a slot therein. The cam groove 16 is such that the forward (small total delivery) stroke of the double. acting pump is divided into 3-4 impulses and the return (large total delivery) stroke into 12-14 impulses, so that ink deliveries at all impulses are equal, the amount being variable by adjusting the pin 26 (or pivot 19) in the slot of the lever 21 (or arm 34). When a singleacting pump is used the cam groove 16 and follower may be replaced by a pawl-andratchet drive tripped for a rapid spring return. Three manual controls are provided: (1) for controlling the amount of ink delivered at each impulse, a knob integral with a pinion 44 free on a shaft 40 is rotated to set the distance of the pin 26 from the pivot 22; (2) for manual pumpactuation a J-shaped lever 63 is swung clockwise about a pivot 64 by a hand lever 61 in two steps, the first withdrawing the pin 26 from its slot in the swinging lever 21, and the second swinging the plate 31 and hence actuating the pump; (3) for cutting out the inking mechanism a snap-action hand lever 81 is swung clockwise about its pivot 82 to cause the first step movement of the J-shaped lever 63 referred to in (2) above. (1) The pinion 44 drives the shaft 40 through a pinion 45 on a fixed pivot 46 and an internally toothed sector 50 on a disc 51 secured to the shaft 40 and carrying a dial-flange 52 and a ¢-cylindrical stop sleeve which abuts against a fixed screw; friction of the pinion 44 against the disc 51, caused by a spring in the knob, holds the mechanism in any set position. Linked crank arms couple the shaft 40 to a shaft 60 carrying an eccentric stud 28 which engages a slot in the link 27 carrying the pin 26; the dial flange 52 may be mounted on the shaft 60. (2) The hand lever 61 is pivoted at 62 to the J-shaped lever 63, the joint becoming rigid when the edges 65, 66 meet; the lever 63, spring-loaded at 79, is linked to a plate 70, free on the shaft 60, having three projections resting in recesses in the mounting plate 23 but movable therefrom during the first step of movement referred to above, whereby the shaft 60, together with the link 27, is moved axially against a spring sufficiently to disengage the pin 26 from the lever 21, but not the link 27 from the longer pin 30. During the second step of movement a pin 74 on the plate 70 engages a ¢-cylindrical sleeve 75 on an arm 76 free on the shaft 60 and coupled by a link 77 to the plate 31. (3) The lever 81 is loaded by an over-centre tension spring 83 anchored at 84, and has a shaped edge 85, 87 to engage a pin 86 on the J-shaped lever 63.