Lock-up for thin printing plate

Claim 1

Printing plate lock-up structure comprising a generally partly cylindrical saddle having opposite arcuate side edges and straight end edges and adapted to be fixed to a cylindrical press roll, means at one straight edge of said saddle for fixed engagement with one edge of a thin flexible printing plate, a movable bar adjacent the opposite straight edge of said saddle, means on said bar for fixedly engaging the opposite edge of said plate, toggle means connecting said bar to said saddle to tension the printing plate as said toggle means is straightened, said toggle means comprising arms extending laterally from the ends of said bar and pivoted to the sides of said saddle at the outer ends of said arms, locking means acting between said arms and said saddle for locking said arms to said saddle with said bar in position adjacent the said opposite free edge of said saddle and against said press rolls, said locking means comprising outwardly biased spring pressed pins in the sides of said saddle, and openings in said arms adapted to receive the ends of said pins when said bar is in position against said press roll.