Patent GB-267211-A (GB)
Title: Improvements in, or relating to, rotary intaglio or photogravure printing machines or the like
IPC: B41F9/02
Filed: 1925-12-08
Abstract: 267,211. Robinson, P. G., Wilde, H., Sargent, T., Knight, E. J., and Robinson, Ltd., E. S. & A. Dec. 8, 1925. Rotary intaglio machines; tripping-arrangements; printing-processes.-A rotary intaglio printing machine is equipped with a number of printing-units each of which is movable bodily and comprises a printing-cylinder, inking-apparatus, and doctor blades, means being provided for simultaneously tripping the printing-cylinders and for maintaining the drive of the printing- cylinders after being tripped. In the machine shown in Figs. 1 and 2, a web 4 passes round an impression or offset cylinder c co-operating with printing-cylinders a, a<1>, a<2> each equipped with inking-apparatus comprising a duct d, d<1>, d<2>, an inking-roller e, e<1>, e<2>, and an oscillating doctor f, f<1>, f<2>. To prevent fouling of the impression by the offsetting of ink from the web on to the printing-cylinders a<1>, a<2> there are provided auxiliary spring-pressed doctors h, h<1> which clean the printing-cylinders before they are reinked by the roller e<1>, e<2>. The auxiliary doctors are carried by arms j, j<1> secured to the ducts d<1>, d<2>. The inking-apparatus are supported by pins k, Fig. 2, which can slide in the bearings L, L<1>, L<2> of the associated printing-cylinders, cams m on the cylinder shafts b, b<1>, b<2> cooperating with rollers n on the ducts to reciprocate the inking-apparatus bodily. The printing- cylinders are adjustably secured to their shafts by screws g. The bearings L, L<1>, L<2> can slide in the framework and are adjustable by means of hand-wheels r, r', r<2> which operate slides t, t<1>, t<2> carrying springs in engagement with the bearings. The printing-cylinders are tripped simultaneously by means of links o, o', o<2> connected to a rocking plate p gearing with a pinion q which is rocked by means of a hand-lever v or by means of a link v<2> in connection with a subsidiary machine such as a paper-bag making machine. Each printing-cylinder and the associated inking-apparatus moves bodily as a unit when the printing-cylinders are tripped. The printing-cylinders are driven by means of a pulley 10 on a shaft 11 provided with a pinion 12 gearing with pinions 13, 14 on the printing-cylinders a<1>, a<2>, the printing-cylinder a having a pinion 16 gearing with the pinion 15. When the printing- cylinders are tripped they are maintained in continuous rotation by the gearing, and drying of the ink is thereby prevented. When the printing- machine is used in connection with a subsidiary machine, the following driving-mechanism is provided :-The subsidiary machine drives, by means of a chain 18, a loose chain-wheel 17 provided with a pawl 19 engaging a ratchet-wheel 20 on the shaft 11, and the pulley 10 is driven by a belt from a pulley 24 coupled to a driving- shaft 21 by means of a pawl 23 and ratchet-wheel 22. When the subsidiary machine is working, the printing-machine is driven by the belt 18, the pawl 23 over-running, but when the subsidiary machine is stopped and the printing- cylinders are tripped, the printing-machine is driven at a reduced speed by the shaft 21. The chain and chain-wheel may be replaced by gearing.