Patent ID: 8720336

Claim:
A printing plate assembly for a magnet cylinder which magnetically holds the plate, comprising: a main body of the plate which main both is formed of a flexible thin plate-like magnetic material for magnetically mounting on an outer surface of the magnet cylinder; a non-magnetic sheet which is formed from a flexible thin plate-like member and partially bonded only to one end portion of said main body to project from the end portion of said main body, wherein one half of said non-magnetic sheet in the vertical direction of said main body overlaps the one end portion of said main body and the remaining half of said non-magnetic sheet in the vertical direction of said main body projects from the one end portion of said main body; and a magnetic piece configured to be magnetically attracted toward and retained against the outer surface of the magnet cylinder through said non-magnetic sheet to thereby hold said main body to the outer surface of the magnet cylinder, when said main body is mounted on the outer surface of the magnet cylinder, wherein said main body, non-magnetic sheet and magnetic piece are configured so that when the plate is to be dismounted from the magnet cylinder, by removing said magnetic piece from said non-magnetic sheet, only said non-magnetic sheet lifts away from the outer surface of the magnet cylinder in a state said main body is magnetically held on the magnet cylinder.