Patent GB-191030002-A (GB)
Title: Improvements in or relating to Machines for Transferring or Offset Printing of Designs onto Cylindrical Surfaces.
Inventor: MOTLEY ALFRED HENRY
IPC: B41C1/18
Filed: 1910-12-24
Granted: 1911-12-27
Abstract: 30,002. Motley, A. H. Oct. 1, [Convention date]. Cylinder machines; printing on rollers.-Relates to a machine for offset-printing designs on to cylindrical surfaces such as rollers, in which, in order to join up the design correctly on the surface of the roller, the roller is given a slight backward or forward slipping motion relative to the surface from which it receives the design, in a similar manner to that set out in Specification 23,819/08. The machine, which is particularly applicable for producing designs in etching resist, comprises a frame 11 on which a carriage 16 is reciprocated by a rack- and-pinion gear 20, 21, 22. On the carriage 16 is a bed 23 adjustable in height by screws 24, on which is pivoted by a pin 27 a bed 26 for receiving the printing-plate, which can be turned to square the plate to the roller to be printed by worm gear operated by a wheel 97. The plate, which is secured by any suitable strainer, is inked by a usual arrangement of rollers 32, 32<1>, 32<11>, and, as the bed reciprocates, impresses its design on to an offset blanket 38 on the cylinder 36. The cylinder' carries at one end a fast pinion gearing with a rack fast to the bed, and at the other with a loose pinion gearing with a rack 42 capable of a small longitudinal movement on the bed. The cylinder bearings 34 have bolted thereto brackets 43 supporting a shaft 44, on which are secured two bell-cranks 46. The arms 45 of these bellcranks are slotted to receive adjustable bearings 50 for a mandrel 51 adapted to receive the copper roller 52 to be printed. The mandrel carries at one end a pinion engaging the loose gear on the offset cylinder 36. One of the bell-cranks 46 is connected to a spring-rod 67 tending to rock the roller 52 away from the offset cylinder, and an eccentrically - mounted roller 62 on the bell-crank into engagement with an adjustable cam 58 on a shaft 59 driven by gearing 61 from the cylinder 36. The cam 58 is in the form of three disks, of which t h e centre one is secured to the shaft while the outer two are adjustable relatively thereto to vary the effective length. The roller can thus be held in contact with the offset surface for exactly one complete revolution. Should the design, or a number of repeats thereof, not exactly correspond to the circumference of the roller, a slight slip is communicated to the roller by means of the loose pinion on the cylinder 36 and the movable rack on the bed. Beneath the bed is a slide 71, pivoted at one end, and at the other furnished with worm gear 75 for the purpose of setting the slide in an inclined position, Fig. 8. On the reciprocating bed is a slide 82 in which is located a block 80, carrying a roller 79 adapted to run in the slide 71. If the slide 71 is inclined, the block 80 is moved, and by means of a rack 80<1>, rotates a pinion 84 which gears with a short rack 88 secured to the movable rack 42 on the bed. The loose wheel on the cylinder 36 is thus given a slight movement independent of the cylinder, driving the roller 62 slightly slower or faster than the peripheral speed of the offset surface.