Patent GB-479382-A (GB)
Title: Improvements in and relating to duplicating, copying and printing machines
IPC: B41L15/02
Filed: 1936-11-09
Abstract: 479,382. Printing-machines. SKERRITT, R. S. Nov. 9, 1936, No. 30473. Convention date, Aug. 21, 1936. [A Specification was laid open to inspection under Sect. 9] of the Acts, May 21, 1937.] [Class 100 (ii)] A portable printing, duplicating, or copying machine is constructed with a reciprocating bed which co-operates with an impression cylinder which is looked from rotation as the bed is moved in one direction, and is rotated during the return movement of the bed to make an impression. When the bed carries a printing-forme or set-up type this is inked during the first movement of the bed by means of an inking-roller mounted in a recess in the impression cylinder, the inking-roller being carried out of operative position as the impression cylinder rotates. The bed 20, Fig. 1, is formed with projections which slide in guides 22 in a base 21 fitted with standards 24 in which is mounted the shaft 25 of the impression cylinder 26. The shaft 25 is operated by a hand-crank 70, or by other means, and in normal operation is moved clockwise from the position shown in Fig. 14 to cause the bed 20, by means of a gear 27 and rack 28, to move towards the left and to receive ink from a roller 29 mounted in a recess in the impression cylinder 26, which is held stationary by means of a locking-bolt 52, Fig. 11. This bolt is raised by a cam surface on the bed which engages a roller 59 on a rod 60 mounted in a sleeve 61 fitted with a spring 62 for raising the bolt 52 and causing a projection 56 thereon to engage a recess in one of the standards 24, and to release the shaft 26 which is normally held stationary by the projection 56. The roller 29 co-operates with an adjustably mounted hollow roller 30 which is driven by the roller 29 and is reciprocated axially by pins 51 which engage cam surfaces 38 upon which the roller 30 rotates. The roller 26 is driven by gears 32, 34, 34, Fig. 4, from the shaft 25, the gear 34 having pins 36 which engage radial slots in one end of the roller 29. The roller 29 freely rotates on a shaft 35 provided with eccentric end pieces 35a, one of which seats centrally in the bore of gear 34 and the other of which seats in a locking means 41, Fig. 8, fixed to the end wall of roller 26 and comprising clamping-members 42, 43 operated by a screw 44. When the bed 20 reaches its extreme position to the left, spring-operated grippers 65 are opened by the action of a cam 69 on a trigger 68 on the gripper shaft, and a sheet is taken from a feed table 64. The crank 20 is then reversed and the grippers hold the sheet and the bolt 52 is now operated to lock the roller 26 to the shaft 25, and printing is effected as the inked bed moves back under the rotating cylinder. On the completion of one revolution of the cylinder the grippers are opened to deliver the printed sheet, and on further reversal of the crank 20 the roller 26 is again freed from its shaft 25. In modifications, the inking-rollers are put out of action and the bed 20 may be fitted with an ink pad and a stencil, or with a printing-frame or chase over which an inked ribbon is placed, or with a slab of gelatine, or clay copying material upon which a design to be copied is transferred from a master sheet.