Patent GB-433096-A (GB)
Title: Improvements in auxiliary printing devices
IPC: B41F31/30
Filed: 1934-08-13
Abstract: 433,096. Printing-machines. AMERICAN TYPE FOUNDERS CO., 300, Communipaw Avenue, Jersey City, New Jersey, U.S.A. Aug. 13, 1934, No. 23359. Convention date, Sept. 8, 1933. [Class 100 (ii)] An auxiliary printing attachment which is especially applicable for printing in connection with a bed and cylinder press of the continuous revolution type is constructed so as to print a direct or offset impression, preferably in colour, on the impression cylinder of the main press prior to the reception of the main impression, preferably a typographic impression in black. The attachment is shown in connection with a tworevolution cylinder machine which is fitted with sheet-feeding mechanism comprising a pivoted feed board 32, oscillating gripper arms 33, and front stops 40, all of which can be moved aside to permit access to the bed 17 and inking-apparatus 19 of the machine. The offset cylinder 70 and plate cylinder 60 of the printing attachment are formed with gaps which permit of the displacement of the feeding devices. The cylinders 70, 60 are mounted in slides 65 which are reciprocated in guides 69 attached to an auxiliary frame 11. A multiple cam 30 which is formed with a cam 29 for actuating the tripping of the impression cylinder 20 of the bed machine and with a cam 50 for actuating the grippers, is also formed with cams 85, 59 for actuating respectively a forked lever 72 for reciprocating, the slides 65, and a stripper 55 which assists to deliver the printed sheet. Margin rollers 38 are arranged on the feed side of the machine near the stops 40. The forked lever 72 engages a pin 26 on a slide 65, and the lever is acted on by an adjustable spring 89 which may be arranged to assist or oppose the gravitational force with which the rollers 60, 70 are moved towards the impression roller 20. To keep the roller 70 permanently out of contact with the roller 20 the left hand end 77 of lever 22 may be depressed by a cam 97 actuated by a handle 95, and the slide 65 is thus maintained in a raised position. The offset roller 70 may be tripped relatively to the plate roller 60 by rotating eccentric bearings 101 in which the roller 70 is mounted. The bearings 101 are connected by adjustable links 105 to crank-arms fitted with a lever 104 which is normally held in raised position by a spring catch 108. When the catch is released and the lever depressed, the bearings 101 are rotated and the cylinders 60, 70 are separated. The cylinder 60 is fitted with a planographic printing-surface, and is fitted with inking- apparatus comprising adjustably mounted inkapplying rollers 165 and supply rollers therefor, and with a damping roller 190 supplied by an oscillating messenger roller 183 operated by a crank 188 on the shaft 35 of the sheet-feeding apparatus. The crank operates a link 187 having a pin-and-slot connection with the lever in which the roller 183 is mounted. The water supply roller 170 is driven by a belt connection from the shaft 62 of the roller 60 and a jockey pulley 180 keeps the belt taut. The rollers 165 are supplied from a fountain roller 127 which is rotated intermittently by a cam-actuated ratchet mechanism, and a messenger roller 133 carried by a swinging arm 134 and fitted with a detachable rider roller 140 conveys the ink to a vibrator roller 144 which is reciprocated axially by a lever 148 actuated by a cam on the shaft of the plate roller 60. The roller 144 is fitted with adjustable rider rollers 157, 158. In the modification, Fig. 6, the offset roll is dispensed with and the printing-roll 270 prints directly on the impression cylinder of the main press. The cylinder 270 is mounted in blocks 285 which are raised and lowered as described in connection with the first modification, and a hand-operated cam 297 can trip the auxiliary printing-roller permanently. The inking-apparatus is very similar to that described for the offset attachment and the vibrator roller 244 is actuated from the printing roll. The rider rolls 258 are somewhat differently arranged, and the messenger roller 233 is detachably secured in its swinging lever and is not fitted with a rider roller.