GB631661A - Improvements in or relating to inking mechanism for printing machines - Google Patents

Abstract

631,661. Inking-apparatus. LINOTYPE & MACHINERY, Ltd., and SPENCE, F. March 26, 1946, No. 9297. [Class 100 (ii)] In inking-mechanism for a printing-machine comprising a forme 1, Fig. 2, carried by a reciprocating bed 2, and inking-rollers F<SP>1</SP>, F<SP>2</SP> receiving ink from a rotary ink-drum D supplied by a ductor roller d movable into and out of contact with a duct-roller 3, and a driven starter-roller adapted to rotate the roller d and increase its surface speed after leaving the roller 3, the roller d is moved alternately into contact with the roller 3 and drum D, the latter having a surface capable of carrying ink for several inkings of the forme, and the starter roller rotating the roller d at a surface speed corresponding to that of the drum D. As shown, the roller F<SP>1</SP> is rotated alternately in opposite directions from a rack on the bed 2 and is inked by a vibrator roller V<SP>1</SP> contacting a transfer roller T<SP>1</SP> moved periodically into contact with the drum D and the roller F<SP>2</SP> is rotated continuously in one direction by gearing from the main drive, is inked from the drum D by vibrator and transfer rollers V2, T<SP>2</SP> respectively and is lifted off the forme 1 during the return stroke of the bed by pusher rods 156 engaging arms 155 carrying screws 151 engaging bearings in which the roller F2 is mounted. The rods 156 are actuated by levers 157 rocked by links 159 associated with mechanism described below whereby the roller F<SP>2</SP> is lifted when the roller d is in contact with the roller 3. Bell cranks 30 carrying the roller d are rocked about a pivot 31 by rods 33 connected to levers rocked from a main cam-shaft, spring couplings between the rods and levers limiting the pressure of the roller d on the drum D. A pawl 13, Fig. 6, for rotating the duct roller 3 step-by-step is carried by a bell-crank 15 rocked from the cam-shaft through a rod 17, Fig. 2, and is pressed towards a ratchet 14 by a spring 21 carrying a hook for holding the pawl inoperative to allow manual rotation of the roller 3. The diameter of the roller D is not an exact multiple of that of the roller d whereby bands of colour transferred by the latter overlap on the former. The transfer rollers T<SP>1</SP>, T2 are normally held away from the drum D by spring-pressed plungers 69, Fig. 11, and springs 79 respectively, and are lifted into contact periodically by cam-operated rods 90 engaging levers 80, 81 pivoted at 91, 92, screws 93, 94 on the levers engaging bearings 60 carrying the roller T<SP>1</SP> and push-pins 67 engaging levers 73 connected to bearings 66 for the roller T<SP>2</SP> respectively. Cover plates for tommybar holes 93a, 94a in the screws prevent adjustment except when the arms 80, 81 are in the raised positions. The roller V<SP>1</SP> is reciprocated axially by a cam-actuated lever engaging a groove in its shaft, and the roller V<SP>2</SP> by a bellcrank 132, Fig. 2, fixed to a cam-actuated oscillating shaft 135, a second arm 147 on the crank effecting axial reciprocation of the drum D. Actuation of the duct-roller 3 and the transfer rollers T<SP>1</SP>, T<SP>2</SP> is prevented when the impression roller I is tripped, by a rod 161, Fig. 2, connected to an eccentric 103 for tripping the roller and adapted to trip the pawl 13, and a second rod preventing movement of the rod 90. To facilitate cleaning and removal of the rollers, the roller D together with a rider 46, Fig. 2, may be lifted to an inoperative position, and held by a hook 48, and the rollers V<SP>1</SP>, V<SP>2</SP> and T<SP>2</SP> are mounted in an auxiliary frame 56, Fig. 13, adapted to be rocked into the position shown and to be retained by a catch plate 76. Hooks 77, 78 lift the rollers Vl, V<SP>2</SP> out of half bearings 58, 64. Specification 381,966 is referred to.