An automatic applicator of a sticky back material to a printing sleeve is disclosed. The applicator includes a controller that is programmable with data relating to the size and desired positioning of the sticky back material to the sleeve. The sticky back material is secured to a transport system and cut to the desired size by a cutter, creating a sheet. The sheet is then transported between a pressure roller and the sleeve. The pressure roller applies pressure to the sticky back sheet, applying the sheet to the sleeve. A mandrel grips and rotates the sleeve to apply the sticky back sheet around an exterior surface of the sleeve.

A stopper for assuredly preventing shifting of a cylindrical printing plate mounted on a plate cylinder is provided. A plate cylinder 1 has a plate-mounting surface 12 on which a cylindrical printing plate 3 is fitted from the front end side and mounted. A front stopper 4 is provided on the end portion of the front end side. The front stopper 4 is configured so as to be able to switch between a protruding orientation in which at least a portion of the stopper is positioned so as to protrude to the outside of the plate-mounting surface 12 in the radial direction and a retracted orientation in which the entire stopper is positioned to the inside of the plate-mounting surface 12 in the radial direction.

A stopper for assuredly preventing shifting of a cylindrical printing plate mounted on a plate cylinder is provided. A plate cylinder 1 has a plate-mounting surface 12 on which a cylindrical printing plate 3 is fitted from the front end side and mounted. A front stopper 4 is provided on the end portion of the front end side. The front stopper 4 is configured so as to be able to switch between a protruding orientation in which at least a portion of the stopper is positioned so as to protrude to the outside of the plate-mounting surface 12 in the radial direction and a retracted orientation in which the entire stopper is positioned to the inside of the plate-mounting surface 12 in the radial direction.

The present invention relates to a device for replacing the printing roller in a printing unit, in particular for in line rotary flexographic machines.

The present invention relates to a device for replacing the printing roller in a printing unit, in particular for in line rotary flexographic machines.