Patent GB-190108393-A (GB)
Title: Improvements in Perfecting or Two Colour Printing Presses.
Inventor: MARKS GEORGE CROYDON
Filed: 1901-04-23
Granted: 1901-05-25
Abstract: 8393. Marks, G. C., [Campbell Printing Press and Manufacturing Co.]. April 23. Cylinder machines with plane printing-surfaces.- Relates to machines which may be used either for perfecting or for printing in two colours on one side of a sheet. Fig. 2 shows a sectional elevation of a two-revolution machine arranged for two-colour printing, and Fig. 5 shows, diagrammatically, the machine arranged for perfecting. The cylinders A, B print against the formes 12, 13 on the bed, which is reciprocated in a usual manner. The cylinders are raised and lowered by suitable means, such as eccentric bearings 16 and rods 18 &c. For twocolour work, the cylinders are driven in the same direction by wheels 25, 26 gearing with a pinion on a driving-shaft 24. Inking-mechanisms 14, 15 are placed at each end of the machine, and may be driven from a shaft 290. Between the cylinders A and B is a sheettransferring mechanism consisting of a rotating gripper bar 33 and grippers 34 on a shaft 32, a transfer cylinder 37 having grippers 38, and a second gripper bar 40 and grippers 41. The shafts of the transfer cylinder 37 and gripper bar 40 are carried in a triangular frame 36 pivoted on the shaft 32 so that they may be moved to bring either the bar 40 and grippers 41, or the cylinder 37, into co-operation with the second impression cylinder B. In two-colour work, the sheet is transferred from the grippers 21 of the cylinder A by the bar and grippers 33, 34 to the cylinder 37, and thence by the bar and grippers 40, 41 to the grippers 22 on the cylinder B. The second set of grippers 23 on the cylinder B is used when perfecting. The triangular frame 36 is connected by a cord or chain 50 to a winch 46 geared to the shaft of a handle 48, by which the frame 36 may be moved into either of the positions shown in Figs. 2 and 5. A pivoted frame 44, carrying a delivery cylinder 43, has a connection 51 with the winch, so arranged that, when the cylinder 43 is raised out of operative position, the frame 36 is lowered, as in Fig. 2, and vice versÔ. In twocolour work, Fig. 2, the sheets are delivered from the cylinder B by a switch 53, tapes 52, and fly 54 to the board D. When perfecting, the cylinder 43 is lowered and the frame 36 raised, and the cylinder B is driven in the opposite direction by an intermediate wheel gearing with the wheel 25, Fig. 5. The sheets are in this case transferred to the grippers 23 by the bar and grippers 33, 34 and the cylinder 37, the second bar and grippers 40, 41 being out of operation. The switch and delivery tapes &c. are set to the delivery cylinder 43, which is now down in operative position. Any suitable means may be employed for operating the grippers. In a modification, the first impression cylinder, to which the sheets are fed, is arranged to be driven in either direction, the sheets being fed directly to it from the feedboard in the one case, and through a feeding- cylinder in the other case. It has two sets of grippers, one at each end of the impression surface. The sheets are transferred, by the arrangement described, to the second cylinder, which is driven always in the same direction. The second cylinder has two toothed starting-segments for engaging short starting-racks on the bed, and the first cylinder has one starting-segment.