Patent GB-398949-A (GB)
Title: Improvements in and connected with rotary offset printing-presses
IPC: B41F5/22
Filed: 1932-05-05
Abstract: 398,949. Printing-machines. ADSIT, F. W., 687, East 7th Street, St. Paul, Minnesota, U.S.A. May 5, 1932, No. 13015. [Classes 100 (i) and 100 (ii).] In a colour-printing and cutting-out press which is especially applicable for ,printing cartons in multi-colour and cutting-out and scoring the blanks so that they can be readily folded, a web 10 of cardboard &c. is led in a straight path from a roll D between two offset printing-cylinders 11, 12 which each print the web with a multi-colour impression, each offset cylinder serving as the impression cylinder for the other. The printed web is then led between a cutting-out and scoring roll C cooperating with a soft metal counterpressure roller, and the waste product is then pressed away from the shaped carton by a further pair of rollers G and the finished cartons are delivered by a conveyer H. The colour impressions on the cylinders 11, 12 are obtained from printing-cylinders 30, each of which forms a part of a detachable printing and inking unit E, each unit being driven from the offset cylinder and being adjustable radially and circumferentially relatively to its offset cylinder. The offset cylinders 11, 12 are driven from a central shaft 17 driven from a motor and mounted in an adjustable frame. The cylinders 11, 12 are detachably secured to their shafts 83, which, as shown in Fig. 8, are provided with tapered cores 82 to which sleeves 81 carrying the offset blankets are secured by means of bolts 84 passing through lugs 85 on the sleeves. Collars 86 on the bolts prevent their detachment from the lugs. The offset cylinders are fitted with bearing collars 25, 26, and with driving-gears 20, 21. To fit new offset cylinders in place, the bearings 13, 14, Fig. 1, are moved outwards, and long bearings 88, Fig. 3, are provided on the opposite side of the frame to support the shafts 83 when the bearings 13 14, are removed. Each type-inking unit E is adjustable circumferentially about a pair of arc-shaped yokes 27 which are arranged concentric to each offset cylinder. Each unit is supported by brackets 60 provided with bases 61 through which pass bolts 28 extending into the slots 55 in the yokes 27, and by means of the bolts 28 the brackets 60 are secured in the desired circumferential position around the cylinders 11, 12. The units E each comprise a printing-cylinder 30, a pair of inkapplying composition rollers 31, and a metal spreading cylinder 33 receiving ink from a fountain roller 42 by means of an oscillating messenger roller 49. The inking-rollers are all driven by gearing 32, 34, 36, 37, 38, 40, Fig. 3, from the gear 29 by means of which the cylinder 30 is geared to the offset cylinder. The roller 33 is reciprocated axially by a cam 44 on the shaft 41 of roller 42, and the messenger roller is also oscillated by a cam on the shaft 41. The bearings of the inking - rollers are supported in slides secured by bolts to the brackets 60 in such a manner that the inking - apparatus is adjustable radially so as to co-operate with offset cylinders of different sizes, and the fountains 43 are angularly adjustable so that they can be set to operate without spilling in any angular position about the rollers 11, 12. The type cylinders 30 are readily changeable and are secured to their supporting shafts 89, Fig. 9, by means of a conical bearing member 90 rigidly secured to the shaft 89 and adapted to engage a countersunk end of the cylinder 30. A screwed conical sleeve 91 is drawn tightly into a similar countersunk recess in the other end of the cylinder 30. In order to adjust the cylinder 30 to a slight extent relatively to gear 29, gear racks 95, 96 are cut in the gear 29 and in an adjacent end of the sleeve 30, and by means of a pinion 98, Fig. 10, at the end of an operating- handle 97, a fine adjustment is obtained by engaging the pinion in both racks. A scale 100 and pointer 101 assists the adjustment The printed blanks are cut out and scored by a pair of rollers 102, 110, Fig. 1, of which the upper roller 102 is the cutting roller and is constructed as shown in Fig. 11, of a shell 154 which is carried by a sleeve 106 detachably connected to a driving-shaft 109. The cutting knives 103 and scoring devices 104 are formed of metal in a ribbon or wire form which is soldered to the shell 154, and the cylinder 110 which co-operates with cylinder 102 is provided with a surface of sheet zinc or copper, or like soft material. The cylinder 102 is fitted with a driving-gear 111, and racks 113, 1131 are formed in the gear 111 and in the bearer 112 of the cylinder 102, so that by means of the adjusting pinion 98, Fig. 10, a fine adjustment of the cylinder 102 relatively to its driving-gear may be effected. The feed of the carton through the cylinders 102, 110 is assisted by a knurled rule 120 which is formed of strip material soldered to the shell. The waste product is stripped from the carton by cooperating projections 116 on a roller 114, Fig. 1, and recesses 117 on a roller 115 which is set slightly in arrear of the roller 114.