Machine plate fastening means, plate cylinder fitted with said fastening means, and offset printing machine equipped with said plate cylinder

摘要

There are provided a machine plate fastening means for an offset printing machine, which is placed on the upper clamp plate of a PS plate lock-up device fitted in the cut-off part of a plate cylinder used for an offset printing machine so that it is attachable to or detachable from the clamp plate by the use of at least two bolts; with the fastening means comprising (i) a lower plate having the back part which is attached to the PS plate lock-up device with the bolts, the middle part over which a machine plate is fastened by putting fastening pins in the fastening holes punched therein and the front part for introducing the insertion of the machine plate, (ii) one or more of a leaf spring for pressing the machine plate, which is inserted and fastened by the fastening pins at the fastening holes, so as to prevent the machine plate from slipping off the fastening pins and (iii) an upper plate laid on the lower plate directly or via a spacer so that it is united to the back part of the lower plate; wherein the fastening pins are fixed to the middle part of the lower plate so as to project into the space above the lower plate when the upper plate is arranged only on the back part of the lower plate.