Patent GB-190800408-A (GB)
Title: Improvements in Printing Machines.
Inventor: GREEN WARREN LUQUEER
Filed: 1908-01-07
Granted: 1909-01-07
Abstract: 408. Green, W. L. Jan. 7. Lithographic and like printing.-Relates to a rotary lithographic machine for simultaneously printing in one or more colours on both sides of a sheet or web, comprising rubber-covered cylinders 1, 2 serving as both transfer and impression cylinders, and forme cylinders 3, 4 provided with damping- apparatus 5, 6, 7, 8 and inking-apparatus 45. The upper cylinder 2, the forme cylinders 4, and the attendant damping and inking mechanism are supported in a frame 154, which is adjustable vertically on the columns 153 by means of a handle and worm and rack-and-pinion gearing, and is clamped by means of split collars 156 and band-wheels 158. The upper inking-apparatus comprising the rollers 52, drums 53, distributing- rollers 54, and inkers 55, and the lower inking-apparatus comprising the rollers 47, 48, 49, 50, are mounted in sliding frames 169 vertically adjustable by means of worm' and rack-andpinion gearing. The machine is driven by an electromotor which operates by means of spur and bevel gearing a vertical shaft 69, Fig. 9. A bevel-wheel 70 on this shaft engages a wheel 71 on the shaft 72, on which is a pinion 73 gearing with a wheel 74 fast on the shaft of the lower cylinder 1, and a wheel 77 loose on the shaft of the upper cylinder 2. A bevel-wheel 78 integral with the wheel 77 engages two planetary bevel-wheels 82 carried by a worm-wheel 80, which are also in gear with a wheel 79 fast on the shaft of the upper cylinder 2. The worm-wheel 80 is turned to register the impressions on the two sides of the web by means of a wheel 84. The forme cylinders 3. 4 are driven by gearing from the cylinders 1, 2. Each damping-apparatus comprises a reservoir 5, rollers 9, 10, 12, and a vibrator 11 actuated by an electro-magnet. Each damping-device is driven by a chain from a sprocket-wheel on the shaft of the corresponding forme roller. The ink-duct rollers 43, 44 are rotated intermittently by a pawl actuated from a crank on the corresponding forme roller. The distributing-rollers 49, 54 are reciprocated longitudinally by the means shown in Fig. 20. The roller consists of a shell 130 and a core 131 connected by feathers 133. The other end of the shell is fitted with a head 134 integral with a rod 136 supported in bearings, which carries at its end a piston 138 working in a cylinder 137 secured to the frame. A spring 135 in compression is placed between the core 131 and the head 134. Compressed air or other fluid is admitted to the cylinder 137 by way of pipe 139, and a cylindrical valve 143 provided with ports 144 and reciprocated in the casing 141 by a rod 147 which engages a groove 149 in the roller head 134. The air exhausts through a port 142. The vibrators 11, 19 of the damping-apparatus and the vibrators 46, 51 of the inking-apparatus are oscillated by electromagnets 29, 31, 35, 37 and 58, 59 respectively, connected as shown in Fig. 23. The lines 181, 182 from a generator &c. are connected by a switch 185 with three switches 188, 192, 193. Lines 186 from the switch 188 are connected to the brushes 187 of a motor 97, which drives by means of worm gearing 101, 102 and spur gearing 105 the commutator 98, comprising four non-conducting disks 107 with projecting contact-pins 109, and five conducting disks 108 with inset insulating-blocks 110, all fast on the spindle, Fig. 11. Bearing on the disks 107, 108 are respectively four and five brushes 111, 112, capable of being held either in or out of contact with the disks by springs 115. The four brushes 111 are in parallel in a circuit 196 containing the exciting-coils of the electro-magnets 29, 31, 35, 37 controlling the damping-vibrators 11, and the five brushes 112 are in parallel in a circuit 199 containing the coils of the electro-magnets 58, 59 controlling the inking-vibrators 51. The frequency of oscillation of the vibrators 11,51 may be varied by throwing one or more of the brushes 111, 112 in or out of action.