Patent ID: 6058838
Filing Date: 2000-05-09
Classification: B41F

Abstract:
A machine plate fastening means for an offset printing machine: said means being placed on an upper clamp plate of a PS plate lock-up device fitted in a cut-off part of a plate cylinder used for an offset printing machine so that the fastening means is attachable to or detachable from the clamp plate by the use of at least two bolts, and comprising (i) a lower plate having a back part which is attached to the PS plate lock-up device with the bolts, a middle part over which a machine plate is fastened by putting fastening pins in fastening holes punched therein and a 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, when the upper plate is arranged only on the back part of the lower plate, said fastening pins are fixed to a middle part of the lower plate so as to project into the space above the lower plate, or when the front part of the upper plate extends over the middle part of the lower plate so as to form a space for fastening the machine plate when inserted, said fastening pins are fixed to the middle part of the lower plate or the front part of the upper plate so as to project into the space between the upper plate and the lower plate, and said leaf spring has a bent form and a hole or holes punched out so as to correspond to the fastening pins and enable the fastening pins to go therethrough.