Patent GB-190717425-A (GB)
Title: Improvements in Rotary Web Printing Machines.
Inventor: COY REUBEN DONALSON
Filed: 1907-07-30
Granted: 1908-03-19
Abstract: 17,425. Coy, R. D. July 30. Rotary machines; inking-apparatus; feeding-apparatus for webs; cutting- apparatus.-A rotary web printing- machine for printing single impressions, perfecting, or printing in more than one colour on one side of the web, comprises a frame 1 which supports two geared printing or impression cylinders 8, 11, Fig. 2, the former of which is driven by a pinion on the main driving - shaft. The cylinders 8, 11 are formed with coacting portions of increased diameter to which either printing or impression surfaces may be secured. For printing in two colours, the cylinder 8 is equipped with two printing-plates and the cylinder 11 with the corresponding impression surfaces; while for perfecting, each cylinder carries one printing and one impression surface. The web passes from a reel beneath a roller 13, between feed-rollers 14, 15, around rollers 16, 17, 18, 22, the last two of which are carried by a looping- frame 19<a> reciprocated vertically by a cam 25<a> on a constantly-driven shaft 26 making in the machine shown two revolutions to each revolution of the cylinders, beneath a roller 23, and between feed-rollers 15, 24 to cutting- apparatus. When the machine is producing single impressions, the feedrollers are operated to feed forward the web twice during each revolution of the cylinders between succeeding impressions; but for perfecting or multi-colour printing, the web is fed after alternate impressions only. This is effected by mechanism illustrated in Figs. 7 and 8. The shaft 28 of the feed-roller 15 carries a loose gear 29 which gears with a sector 30, oscillated by a variable crank twice to each revolution of the printing-cylinders. Integral with the wheel 29 is a disk 35 which carries a pawl 37 adapted to engage a ratchet-wheel 38 fast on the shaft 28. The pawl 37 has a tongue 41 projecting into a recess 42 in a disk 40 loose on the hub of the wheel 38 ; this disk by its inertia serves to engage and disengage the pawl to or from the ratchet-wheel 38. Mounted on a stud on the machine frame is a star-wheel 43, which when the web is to be fed at alternate impressions only, is rotated one tooth at each oscillation of the sector by pawl 44. On the wheel 43 is formed a face-cam 45 having a wave-like surface, such that at alternate positions of the wheel the guard-plate 48 carried by the spring- projected frame 47 contacts with the wheel 38 and disengages the pawl from the ratchet teeth. The sheets are finally severed from the web by cutting- mechanism comprising a fixed blade 51 and a blade 50 carried by a member 52, which, is rocked after each or each alternate impression respectively by a double or single-throw cam on the cylinder 11. Each inking-apparatus comprises a duct 61, from which ink is supplied to a steel distributing-drum 68 by a boiler 67 on arms on the shaft 73 oscillated by a cam 69 on the cylinder. The inkers 75, 76 are mounted respectively in arms 79, 78 pivoted concentrically to the drum 68 and connected by links 80, 82 to a crank on the shaft 73. The inkers are thus moved away from the forme they are not required to ink, at each actuation of the shaft 73. The cylinders 8, 11 may be formed with .three or any other convenient number of parts of increased diameter. The upper roller 22 of the looper may be adjusted by a rack and pinion 84 and clamped by a screw 87.