Patent GB-923933-A (GB)
Title: Improvements in printing press
IPC: B41F13/44
Filed: 1960-06-17
Abstract: 923,933. Rotary printing - machines. FRED'K H. LEVEY CO. Inc. June 17, 1960 [Aug. 6, 1959], No. 21358/60. Class 100 (2) In a web-fed rotary offset printing press plate cylinders of various diameters may be readily inserted and used interchangeably, the contacts between the co-operating cylinders being readily adjustable to compensate for changes in plate cylinder diameter. In the multi-colour printing press shown having an impression cylinder 1, and blanket and plate cylinders 2, 4, 3 and 5, the impression cylinder is mounted between side frames 18, 19 through shafts 20 and journal boxes 21 whilst the plate and blanket cylinders are supported through respective shafts 22, 89 and journal boxes 23 of the split type which permits easy removal of the shafts 22 and 89. The latter shafts are of identical diameters which allow different-sized plate and blanket cylinders to be used interchangeably so far as the journal boxes are concerned. Each blanket is rotatably supported at each end by a bracket 26 through a shaft 27 pivotally mounted on the associated frame 18, 19. Pivotally supported by one of the shafts 27 and connected to the associated bracket 26 is a rigid crank arm 28 connecting one end of an adjustable rigid linkage 29, the opposite end of which is threaded into a collar member 30 adapted to fit over an eccentric rotatable bearing sleeve 31 secured to a shaft 32, the latter being rotatably supported by the frames 18, 19. Rotation of shaft 32, effected by the actuation of a pneumatic device 35, 37, 38 and a crank arm 39, causes the linkage 29 to move longitudinally and thus swing the bracket 26, and hence the cylinder 2 or 4, about the axis of the shaft 27. The linkage is threaded into the collar 30 and into a lug 40 projecting from the arm 28 and has a key 41. The threads of the linkage are cut to opposite hand such that rotation thereof through the key 41 adjusts the position of the axis of the blanket cylinder with respect to the axis of the shaft 32 and, hence, with respect to the fixed plate and impression cylinders. The distance between the axes of the blanket and impression cylinders is adjusted by providing on each shaft 27 an eccentric journal of which an eccentric sleeve 42 thereof is adapted to be rotated about the shaft. The dampening water train 7, 8, 9, 6 may be mounted on a track to permit movement relative to the plate cylinder. In the described embodiment, however, actuation of a pneumatic device 48 causes brackets 43, which rotatably support the dampening roller 6, to swing about the axis of the roller 9 without change in the contact adjustment therebetween. The ink forme rollers 10, 11, 12 are supported on bracket pairs 54, 59, 63 pivoted to swing about the axis of the preceding inking roller of the train and actuated through linkages 58 and 66, a shaft 67 and a linkage 69 by a pneumatic device 52 pivotally supported by the frame 18. Respective adjustable linkages 56, 61, 65 are provided for a precise adjustment of the rollers 10, 11 and 12 separately. Adjustment of the piston 71 of the device 52 relative to the position of the rollers 10, 11, 12 is effected through screws 75 which determine the position of an arm 69a relative to the shaft 67. An adjustable positive stop 84 is provided for each blanket cylinder when it is brought to the " on " impression position so as to avoid the consequence of any possible looseness at the shafts 27. Each blanket cylinder is driven from the impression cylinder through co-operating spiral gears 87, 88, whilst the plate cylinder is driven from its associated blanket cylinder through spur gears 90, 91. Axial impression adjustment of the plate and blanket cylinders is effected through hand wheels 92, 93. As shown in connection with the blanket cylinder 2, rotation of the hand wheel 92 effects axial movement of a housing which comprises an annular ring 98, or collar 99 and a plate 100 and secures a roller bearing 97. The latter is positioned between shoulders 95 and 96 formed on the shaft of the cylinder. Through longitudinal movement of the blanket cylinder the spiral gears 87, 88 cause a slight rotation of both the blanket and the plate cylinders for correction of longitudinal register, while the plate cylinder may be independently moved longitudinally to adjust axial register without change in longitudinal register. If required to print in a single colour the press simply comprises cylinders 1, 2 and 3 with associated apparatus.