Patent GB-189703978-A (GB)
Title: Improvements in Surface Printing Presses.
Inventor: JOHNSON JAMES YATE
Filed: 1897-02-13
Granted: 1897-12-11
Abstract: 3978. Johnson, J. Y., [Cornwall Printing Press Co.]. Feb. 13. Lithographic and like printing. -Relates to rotary surface printing - presses, more particularly for the use of aluminium plates. Fig. 2 shows a side elevation, and Fig. 25 a means of clamping the printing- plate on the cylinder. The clamp is pivoted at b in a gap in the cylinder 2 and is adjustable by screws c. The edge of the plate 3 is gripped on to an inclined or wedge-like jaw a by a bar d having a recess with inclined sides, and clamping- s c r e w s i. The impression cylinder 5 is recessed, except at the impression surface, to allow of the passage of a reciprocating gripper paper carrier sliding on ways 10. The grippers take the sheet from the feed-board (which is to the left of Fig. 2) and carry it along between the cylinders, in a straight line. The paper carrier is reciprocated by an arm 18 and cam 20. The printed sheet is taken from the paper carrier by a sliding delivery gripper. The latter is moved more rapidly than the paper carrier, by a wheel 28 gearing with a rack on the delivery gripper slide. On the shaft of the wheel 28 is a wheel gearing with a fixed rack 30, and the shaft is reciprocated by a rod 32, arm 33, and cam 35. Means are provided for opening and closing the grippers. To ensure correct register the paper carrier is geared to the printing-cylinder 2 at the beginning of the impression. The bearings of the cylinder 5 are adjustable by screws 43, and the bearings of the cylinder 2 are held down by screws 50, under the heads of which are springs so that the cylinder can yield to various thicknesses of paper &c. The cylinder 5 may be moved down away from the printing-cylinder by eccentric sleeves operated by arms 44 connected by rods 45 to a treadle 46. The forme-inking rollers 52 are arranged above the cylinder 2, and the intermediate distributers 53 are geared to the cylinder 2 by intermediate pinions. The rollers 52 can be lifted from the cylinder by a lever 62 pivoted at 63, and the supports for the pinions driving the rollers 53 are so arranged that the pinions remain in gear. From two of the rollers 53 run a pyramidal set of rollers 70, the upper one of which is in contact with the ink drum 71. Ink is supplied to the drum from the fountain roller 73 by rollers 74 in a vibrating arm 75. The roller 73 is driven by a ratchet arrangement, and the supply of ink is regulated by means of an adjustable plate or guard which prevents the pawl from engaging the ratchetwheel except through a part of its stroke. The amount of rotation of the roller 73 is thereby regulated. The guard is moved by a handle 88 on which is a plate having a series of holes engaged by a locking- pin. The frame 99 of the damping-rollers 100 is carried by pivoted arms 104, and is engaged by arms 98 of a shaft 94 operated by a cam to move the rollers 100 up to the cylinder only at the parts to be damped. The cam arm is attached to the shaft 94 by a hand-lever which may be operated to move the damping-rollers away from the cylinder at any time. The water is transferred from the roller in the fountain 105 to the damping-rollers, by a roller in an oscillating arm. On the shaft of this arm is a piece having a cam-groove or face engaged by a roller on a slide reciprocated by a crank-pin. The crank-pin is adjustable in a slot in its disc by means of a screw.