Abstract: A transfer cylinder sleeve is provided for an offset printing machine including an inner carrier layer, a compressible layer and a covering layer, where at least one of the layers has a joint or a gap and provided that when a joint or a gap is used in the covering layer, then the transfer cylinder sleeve is applied to a transfer cylinder in register so that the joint in the covering layer rests opposite a tension channel of a plate cylinder during rolling contact of the transfer cylinder with the plate cylinder. Optionally, a non-stretchable layer is provided between the compressible layer and the covering layer, or alternatively, a non-stretchable material is provided in the compressible layer itself.

Abstract: The printing-material web is guided in the same position and plane when the transfer cylinders are moved apart for the flying printing-plate change, so that contact between the web and the transfer cylinders and smearing are avoided, that is to say undesired contact with ink-carrying parts. When the transfer cylinders are moved apart, web-guiding elements at the web inlet and/or web outlet support the printing-material web on both sides during the plate or sleeve change by supporting elements which are narrow or act at points and can be displaced transversely with respect to the printing-material web. The printing-material web continues to be guided in the same position and plane, and smearing is avoided.

Abstract: A form cylinder is provided with a circumferential surface which is convexly curved in the axial direction, such that the convex profile, determined by calculation, of the circumferential surface varies in such a way that the diameter of the form cylinder is largest in the axial center and smallest at the lateral edges.

Abstract: A blanket cylinder has a rotational axis and a concave surface, concentric to the axis and extending over a printing width of the cylinder, for receiving a flat rubber blanket made of elastically deformable material. The cylinder has a recess concentric to the axis, extending over the printing width, and a film fitted in the recess The film has an outside surface which forms the concave surface of the blanket cylinder.

Abstract: A transfer cylinder sleeve is provided for an offset printing machine including an inner carrier layer, a compressible layer and a covering layer, where at least one of the layers has a joint or a gap and provided that when a joint or a gap is used in the covering layer, then the transfer cylinder sleeve is applied to a transfer cylinder in register so that the joint in the covering layer rests opposite a tension channel of a plate cylinder during rolling contact of the transfer cylinder with the plate cylinder. Optionally, a non-stretchable layer is provided between the compressible layer and the covering layer, or alternatively, a non-stretchable material is provided in the compressible layer itself.

Abstract: A forme cylinder is provided with a circumferential surface which is convexly curved in the axial direction, such that the convex profile, determined by calculation, of the circumferential surface varies in such a way that the diameter of the forme cylinder is largest in the axial center and smallest at the lateral edges.

Abstract: A blanket cylinder has a rotational axis and a concave surface, concentric to the axis and extending over a printing width of the cylinder, for receiving a flat rubber blanket made of elastically deformable material. The cylinder has a recess concentric to the axis, extending over the printing width, and a film fitted in the recess The film has an outside surface which forms the concave surface of the blanket cylinder.

Abstract: In order to reliably tension the legs of the carrier plate by means of tongues fastened to spindles, one spindle is designed as a hollow spindle which is mounted in a bore of the cylinder gap of the printing-unit cylinder, and the other spindle is mounted in the hollow spindle.

Abstract: The printing-material web is guided in the same position and plane when the transfer cylinders are moved apart for the flying printing-plate change, so that contact between the web and the transfer cylinders and smearing are avoided, that is to say undesired contact with ink-carrying parts. When the transfer cylinders are moved apart, web-guiding elements at the web inlet and/or web outlet support the printing-material web on both sides during the plate or sleeve change by supporting elements which are narrow or act at points and can be displaced transversely with respect to the printing-material web. The printing-material web continues to be guided in the same position and plane, and smearing is avoided.

Abstract: A rubber cylinder sleeve for web-fed rotary offset printing machines has a covering layer which is a finite layer having a joint location, the joint location being filled with a compressible material.

Abstract: In order to reliably tension the legs of the carrier plate by means of tongues fastened to spindles, one spindle is designed as a hollow spindle which is mounted in a bore of the cylinder gap of the printing-unit cylinder, and the other spindle is mounted in the hollow spindle.

Abstract: A rubber cylinder sleeve for web-fed rotary offset printing machines has a covering layer which is a finite layer having a joint location, the joint location being filled with a compressible material.

Abstract: Large throw-off distances of the transfer cylinders in a double printing unit of a rotary printing machine operating on the rubber/rubber principle are achieved by enabling the two transfer cylinders to be set away from each other, and enabling the two form cylinders to be set away from the respective transfer cylinder. The form cylinder and the transfer cylinder of each printing unit have a drive connection via spur gears, the transfer cylinders are not in tooth engagement via their spur gears, and each printing unit has its own electric motor.

Abstract: A cylinder sleeve for all offset web-fed rotary printing machine comprising a carrier sleeve having a joint location and about which is arranged at least one compressible layer, also having a joint location. Another layer of non-expandable material may be used on top of or within the compressible layer. The non-expandable layer may also have a joint location. A seamless outer layer is provided and disposed about the compressible layer and the non-expandable layer, if so provided.

Abstract: Disclosed is a film roller in an inking unit of a rotary printing machine. The film roller is equipped with an internal cooling system to eliminate irregularities in the ink transfer to the film roller and to improve print quality.

Abstract: A device for reliably and economically moving two doors that are movably mounted on a side wall of a printing group in a rotary printing machine for closing openings in the side wall that are proximate printing group cylinders mounted in the printing group, includes a toggle lever articulately connected between each of the two doors and the side wall and is operated by a selectively actuatable working cylinder.

Abstract: An arrangement for fastening a covering on a cylinder of a printing machine, the arrangement including a cylinder having at least one axially extending cylinder groove which defines a groove wall at an acute angle to an outer surface of the cylinder, and a covering including at least one flexible support plate having a leading flange and a trailing flange that are inserted into the cylinder groove so that the leading flange engages the groove wall and the trailing flange is adjacent the leading flange. A spindle is arranged in the cylinder groove so as to be rotatable between a release position and a clamping position, and a leaf spring is mounted on the spindle so as to press, in the clamping position of the spindle, the trailing flange and the leading flange against the groove wall.

Abstract: The invention relates to a web-fed rotary printing press having a plurality of double printing units in which each of the printing units of the double printing units work together in the blanket--blanket method and each has its own drive. Transfer cylinders of each printing unit are driven independently. To permit a rapid change in production, both upon recto and verso printing, the transfer cylinders of the disconnectable double printing units are separable by eccentric bushings or swingable levers such that a web which passes through the printing press is conducted between them without being printed.

Abstract: An arrangement for fastening a covering on a cylinder of a printing machine, the arrangement including a cylinder having at least one axially extending cylinder groove which defines a groove wall at an acute angle to an outer surface of the cylinder, and a covering including at least one flexible support plate having a leading flange and a trailing flange that are inserted into the cylinder groove so that the leading flange engages the groove wall and the trailing flange is adjacent the leading flange. A spindle is arranged in the cylinder groove so as to be rotatable between a release position and a clamping position, and a leaf spring is mounted on the spindle so as to press, in the clamping position of the spindle, the trailing flange and the leading flange against the groove wall.

Abstract: In a printing unit with two printing groups working together using the blanket-to-blanket method, in order to rotate the form cylinder and the transfer cylinder equally during circumferential register adjustment, the transfer cylinders are drive connected via helical gears and the transfer cylinders and the form cylinders of each printing group are drive connected via straight spur gears. The drive of the printing unit is carried out on one of the helical gears. Circumferential register adjustment of a printing group is carried out by movement of its helical gear.