Abstract: During a washing cycle of a rubber blanket on a blanket cylinder some revolutions of the blanket cylinder are initially performed during which the cleaning element is lifted off the blanket cylinder temporarily when the clamping channel passes under the cleaning element.

Abstract: A method for mounting a printing master on a printing form cylinder includes readying a new print job with a printing-image length by releasing an unwinding spool, activating an unwinding spool drive for moving the printing master a length in circumferential direction of the cylinder on the circumferential surface by drawing the printing master to a rewinding spool and braking the unwinding spool for building tension. A preceding job image start is located on the surface facing the rewinding spool. A control device activates the unwinding spool drive and, before activation, data is produced in the control device regarding the length to be spooled forward, and the spools are fixed, after advancing the printing master a length, for insuring tension. A value is determined for the printing master length to be spooled forward, being at most the printing image length of the preceding print job plus a printing image spacing.

Abstract: A printing unit of a sheet-fed printing press for printing on sheets includes a plate cylinder having a circumference, on which a recess is formed; a feed reel mounted within the recess for feeding a printing film onto the circumference of the plate cylinder so as to introduce an image forming region for each printing operation; an image forming device for forming an image on the image forming region of the printing film fed on the circumference of the plate cylinder with the first edge of the image forming region positioned at an edge of the recess closer to the rewind reel; a rewind reel mounted within the recess for rewinding the printing film from the circumference of the plate cylinder; and a control unit for controlling the length of the printing film to be fed from the feed reel onto the circumference of the plate cylinder, based upon the length of sheets to be printed for each printing operation.

Abstract: An ink-fouling preventing sheet which is attached to a feed or delivery cylinder that supports and moves a printed paper in an offset press. The sheet comprises a flexible sheet base; an adhesive layer formed on the base; many small balls partially buried in the adhesive layer; a primer layer applied over the exposed convex portions of the small balls in the adhesive layer; and a set resin layer made of a silicone-modified urethane resin and applied on the primer layer to take the convex shapes of the small balls.

Abstract: Multiple winding mechanisms are disposed within a single cylinder, such as the plate cylinder of a printing press, and are actuable so as to pay out material across different cylinder segments. For example, the winding mechanisms may be differentially geared to cylinder rotation, such that rotation of the cylinder in a first direction advances material from a first winding mechanism across a first circumferential portion of the cylinder to a second winding mechanism; while rotation of the cylinder in the opposite direction advances material from the second winding mechanism across a second circumferential portion of the cylinder (which may, for example, be diametrically opposed to the first cylinder portion) to the first winding mechanism. Alternatively, material advancement may be achieved by means of a dedicated motor rather than mechanical coupling to cylinder rotation.