Patent GB-240653-A (GB)
Title: Improvements in method of correcting printing presses and apparatus therefor
IPC: B41F3/46
Filed: 1924-10-13
Abstract: 240,653. Claybourn, L. W. Oct. 13, 1924. Portable turning- apparatus; attachments for planing. - In a printing-couple comprising one rotatable member with a second member either rotatable or reciprocable, the typesupporting surfaces are trued into parallelism with the axis of the rotatable member while the parts are in their normal positions in the printing-press. In the application of the invention to a two-revolution two-colour flat-bed printing-press the interconnected beds 21, 22 each having side bearers 25, reciprocate under tympan cylinders 23, 24. The beds are carried on tracks supported by uprights 39 and the tympan cylinders are journaled in bearings 53, 54 eccentrically mounted in adjustable blocks 55, 56, the cylinders being raised intermittently in the operation of the press by cam and lever mechanism. The machine is driven from a pulley-shaft which carries a gear 94 connected through further spur gearing with the tympan and transfer cylinders. A countershaft 96 carries a splined pinion 108 which, selectively engages racks 109, 110 to drive the beds alternately in opposite directions. The trueing- mechanism which may be applied either to the bed or to the cylinder of each printing-couple, comprises supports 151 secured by bolts 152 adapted to coact with a groove 156, Fig. 8, on the support when a cylinder is to be trued. For trueing the bed, the cross-rail is rotated through 90‹, in which position a second tongue 158 engages the support, Fig. 9. The cross rail is provided with guides for a slide 161, and wear of the slide surfaces is taken up by a gib 166 adjusted by screws 167. The slide is fed by a screw 171 rotated by a ratchet wheel 173 which is operated by a pawl on a lever 176 pivoted to a link 180 adjustably connected to a slotted lever on the shaft of the inking mechanism. A ratchet wheel 257 on the shaft of the fountain roller of the inking mechanism, operates a pawl 261 to actuate the link 180 and at the end of the movement of the ratchet wheel the pawl is disengaged by an adjustable trip-cam 266 and is held clear of the wheel while the link 180 is returned by a spring 280. At the end of the return-movement the pawl is re-engaged with the ratchet wheel by means of a second trip cam 273. A hand feed for the cross slide is also provided. The tool slide is adjusted to and from the work by a micrometer head 195 while for planing, a clapper box 197 is pivoted to the tool slide at 198. In order to adjust the cross rail parallel to the axis of the cylinder to be trued a gauge 205, Fig. 24, is provided with pointers 206, 207, one of the pointers being placed in a centre mark on a cylinder bearing and the other on a centre mark in the end of the feed screw, this setting being made at each end of the cylinder until perfect parallelism is obtained. To transfer the trueing- mechanism from one printing-couple to another the apparatus is reversed end for end. The cuttings are removed by means of a suction device comprising a mouth 221 adjacent to the tool and communicating with a suction pipe 223. During the planing operation the bed is preferably held firmly down on its supports by a device which exerts a pressure substantially equal to the printing pressure. This device comprises a cross beam 228 secured to the side frames and provided with a number of spring-pressed rollers 232 contacting with. the bed.