Patent GB-223317-A (GB)
Title: Improvements in or relating to means for cleaning the offset or impression surfaces of rotary offset printing machines
IPC: B41F35/06
Filed: 1923-07-20
Abstract: 223,317. Linotype & Machinery, Ltd., and Goulding, B. J. J. July 20, 1923. Set-off, preventing.-Consists in the combination with means for applying cleaning fluid to the blankets of the impression or offset cylinders of a rotary offset printing-machine, of means for drying the blankets comprising a power-operated roller adapted to transfer sulphur from a trough to the blankets. In a machine having a number of offset or impression cylinders, means may be provided to operate the cleaning and drying apparatus collectively or individually, the drying- apparatus being brought into operation when the cleaning-apparatus is rendered inoperative. The cleaning fluid, preferably consisting of a mixture of petroleum and paraffin, is carried in a trough 5, Fig. 1, in which rotates a roller 6 from which the fluid is transferred by a roller 7 to a roller 8 driven by gearing, Fig. 2, from a shaft 45. Two rollers 9, 10 in continuous contact with the roller 8 are carried by arms 11, 12 pivoted about the shaft 19 of the roller 8 and connected by links 13, 14 to arms 15, 16 on a shaft 17 provided with a hand-lever 18 whereby the rollers 9, 10 may be moved into or out of contact with the cylinder 3, which in the machine shown serves both as an offset and an impression cylinder. To allow the rollers 9, 10 of a number of cleaning-apparatus to be operated simultaneously, the arms 16 are connected by spring plungers 20 to vertical rods 21 connected by bell-cranks 22, rod 23, bell-crank 24, and rod 25 to a hand-lever 26. Individual operation of any of the cleaning-apparatus may be effected by withdrawing the corresponding plunger 20. The drying-apparatus comprises a sulphur trough 28 in which a roller 29 is rotated by gearing from the shaft 45. A roller 30 is carried by a pair of arms 31 which may be rocked about the shaft 32 of the roller 29 by a handlever 33 to move the roller 30 into and out of engagement with the cylinder 3. Collective and individual operation of the rollers 30 may be effected by a hand-lever 40 through connections 39, 38, 37, 36, 34, 35 similar to those employed for the cleaning-apparatus. The hand-levers 26, 40 are connected by a link 41 and spring plunger 42 so that the cleaning and drying rollers are moved into the operative position alternately. When the machine is running normally, the shaft 45 may be disconnected from the driving-shaft 47 by a clutch 48. The rollers 9, 10, 30 may be reciprocated axially and the control of the cleaning and drying apparatus may be associated with that of other organs of the press. Foot-operated devices may be employed instead of hand-levers for operating the rollers. The Provisional Specification describes a pin-and-slot connection between the arms 16 and rods 21, and states that the means for operating the cleaning and drying rollers may be interconnected with means for tripping the cylinders. It also states that pads may be employed instead of rollers, and that the rollers may be geared to run at a different peripheral speed from that of the blanket cylinder.