Rotary web printing presses

摘要

1,093,729. Printing apparatus. MIEHLEGOSS-DEXTER Inc. Dec. 13, 1965 [Jan. 15, 1965], No. 52762/65. Heading B6C. In a rotary web offset litho machine flexibility of plate and blanket cylinder size is effected by switching such cylinder pairs in easily removable and interchangeable units. Each such unit is mounted on wheels 61 and 62 and comprises side walls 56 and 57, Fig. 2, carrying support stays 58 and 59 as well as plate and blanket cylinders 23, 24. The inking and dampening roller trains and associated supply systems are mounted in the machine and each inking or dampening forme roller is spring-urged into contact with the plate cylinder. Cam means are employed to withdraw the rollers from such contact when it is necessary to withdraw the unit, the latter being locked in position in the machine by latches 71. The impression cylinder 25 is slidably mounted through worm and screw-actuated gear in the machine frame such that it may be moved into contact with the particular blanket cylinder being employed. Each blanket cylinder is mounted in eccentric bearings such that it may be readily tripped. Each bearing has an arm carrying a slidable member which coacts with a guide slideway pivotally mounted on the machine frame. Movement of this slideway by hydraulic actuating means causes the arm to rotate, thus moving the cylinder relative to the plate cylinder. The plate cylinder is mounted in eccentric bearings such that it may be skewed relative to the blanket cylinder. Movement of the eccentrics is effected independently at each end through hand-oparated worm drives. The drive gear to the machine is through interconnected gear-wheels and shafts 42, 43, 44, Fig. 1 (not shown), and 43, 46, 47, 231, 234 &c. Fig. 14 (not shown). Fig. 15 (not shown), illustrates diagrammatically the locations of the cylinders of three interchangeable units. Fig. 16 (not shown), shows a perfecting press where each unit carries two blanket and two plate cylinders.