Patent GB-396144-A (GB)
Title: Improvements in or relating to relief printing machines
Filed: 1932-03-02
Abstract: 396,144. Relief-printing machines. HOLMES, A., HOLMES, A. H., HOLMES, F., and HOLMES, A. L., (trading as HOLMES & CO.), Crescent Wharf, Cambridge Street, Birmingham. March 2, 1932, No. 6262. [Class 100 (ii).] Embossing and intaglio-plate printing : bedreciprocating apparatus.-A machine for printing and embossing in relief comprises a vertical or upwardly-inclined reciprocating diebed 1 and a coacting impression-cylinder 6 on which the sheet to be printed is carried, whereby a line pressure is obtained commencing at one end of the die and travelling to the other end. The bed 6 is formed with toothed racks 8 on its rear face which mesh with toothed pinions 9 also engaging fixed racks 11 and mounted on a shaft 10 which is reciprocated vertically so as to reciprocate the bed 1 by a connecting-rod 12 and crank pin 13 on a shaft 15. The bed 1 is counterbalanced by a weight 19 and runs on antifriction bearings 24. A roller 17 on the shaft 10 engages a fixed plate 18 to prevent undue pressure between the pinions 9 and their coacting racks. Toothed racks 4 also are provided on the front face of the bed 1 and engage pinions 5 on the cylinder 6 so that the cylinder is rotated on the downward stroke of the bed. A gap 25 in the pinions 5 causes the cylinder to come to rest at the conclusion of the downward stroke and permits the bed to move upward without rotating the cylinder 6. A spring- catch 79, Fig. 1, engages a projection 80 on the cylinder to prevent such rotation. In its position of rest a pin 28 on the cylinder 6 is engaged by a notch 27 in a lever 26 which is operated from the shaft 15 through a cranklever 29 at the beginning of the downward stroke of the bed 1 so as to impart an initial rotary movement to the cylinder 6 and thus bring the pinions 5 into engagement with the racks 4. Inking -apparatus. The inking-mechanism comprises an inking-roller 31 oscillated from the shaft 15 through a system of levers 34 .. 37 so as to contact with the die-plate during the downward movement and also, if desired, during part of the upward movement of the bed 1. Wiping of the die-plate is effected by wiping paper fed intermittently over a curved plate 39 which is given a rocking and rolling movement over the face of the die-plate. For this purpose, the plate 39 is adjustably fixed to rods 48, 52 which are reciprocated horizontally and independently of one another by cams 44, 49, Fig. 3, on the shaft 15 acting through lever systems 45, 46, 47 and 50, 51 respectively. Vertical adjustment of the plate 39 is effected by a hand wheel 43, Fig. 1, through a lever 41 and link 40 and its distance from the die-plate can be varied by wedges 54 movable by a lever 56 which can be clamped in the adjusted position. The wiping paper is fed from a reel 61 over the plate 39 to a rewind spindle 65 which is driven by ratchetmechanism 68, Fig. 3, through a link 67 and cam-operated lever 66. A pivoted-plate 73 adjustable by means of a lever 76 is provided to vary the feed by engaging a roller 75 at the joint of the ports 66, 67 and thus limiting the movement of the ratchet-pawl. A scraper 101 removes surplus ink from the paper and causes it to return to the ink-trough. Tripping-arrangements. Mechanism is provided for preventing rotation of the cylinder 6 or for tripping the inking-mechanism and wiping-paper feed or both. Side-by-side foot pedals 81, 82 are attached to counterweighted levers 88 having projections engaging forked levers on a shaft 74, and depression of either pedal allows the corresponding lever 87 to drop and become engaged with a recessed end 86 of a lever 84 oscillated by a cam on the shaft 15. If the pedal 81 is operated, its lever 87 engages with and is operated by the lever 84 so that links 92, 93, 95, Fig. 1, are actuated to engage a catch 94 with the projection 80 on the cylinder and to throw the lever 26 outwardly so that it does not engage the pin 28. The engagement of the other lever 87 with the lever 84 rotates a cam 100 into engagement with a roller 102 on the inking-mechanism lever 36 and holds the inking-roller 31 permanently in inoperative position. At the same time, the lever 87 rotates the plate 73 beyond its normal range and a recess 98, Fig. 3, on the plate engages the roller 75 and stops the feed of the wiping paper. A pedal 83 is provided whereby both levers 87 can be operated simultaneously.