A printing cylinder for offset printing includes a cylinder member of a hollow cylinder having a covering portion which forms a substantially uniform, smooth outer circumferential surface having no spliced portion in the circumferential direction, the covering portion being capable of transferring printing images onto an adjacent printing cylinder or printing paper in contact with the covering portion; and printing cylinder support mechanism including a pair of support shafts which are supported on opposed frames such that the support shafts are rotatable about a common axis, the support shafts each having a shaft end portion which is connected to an end portion of the cylinder member via an engagement portion and by use of connection member. The engagement portion includes a depression and a projection formed on the end surface of the cylinder member and the shaft end portion of the corresponding support shaft. Upon engagement of the depression and the projection of each engagement portion, the cylinder member and the support shafts are connected in an aligned manner.
A device for holding at least one roller of a rolling machine that can rotate about a rotational axis includes two holding arrangements that can be arranged on opposite faces of the roller viewed in the direction of the rotational axis. The device further includes at least two coupling parts each configured for a coupled mode and an uncoupled mode. A first of the two coupling parts has at least one, preferably essentially straight first groove, and has a second groove that does not run parallel to the first groove. A second of the two coupling parts includes a first coupling element and a second coupling element, wherein the first coupling element projects further outward from the second coupling part than the second coupling element. In at least one implementation, the roller can be detached or removed from the holding arrangements when the holding arrangements are in uncoupled mode.
The printing cylinder support unit for a printing machine according to the invention comprises a support frame, supporting means mounted on the support frame, and one of a plurality of positioning elements. The supporting means comprise displacement means and at least three support elements for each axial end of a printing cylinder, which support elements are designed each to interact with the positioning element at the location of a support point on the positioning element. The positioning element can be connected to one of a plurality of printing cylinders, the positions of the support points being related to the diameter of the printing cylinder in question. The displacement means are designed to move at least two of the support elements with respect to the support frame so as to receive positioning elements with different support point positions. The positioning element can be connected to the support elements in a rotationally fixed manner and comprises axle support means for accommodating a rotation axle of one of the printing cylinders.
At least two cylinders of a printing machine are arranged in the printing machine. An end journal of each of the cylinders is mounted either in or on a common insert. That common insert is, in turn, detachably located in, or on a lateral frame of the printing machine.
A printing group of a printing machine is comprised of a pair of cylinders each having a circumference that corresponds essentially to a length of a section of a side to be printed. The effective generated surface of at least one of the cylinders comprises, at the most, one break in the circumferential direction. The surface forms, in the longitudinal direction, a plurality of adjacently arranged breaks which, when viewed in the circumferential direction, are arranged in a staggered manner with respect to each other.
A printing group of a printing machine is comprised of a pair of cylinders each having a circumference that corresponds essentially to a length of a section of a side to be printed. The effective generated surface of at least one of the cylinders comprises, at the most, one break in the circumferential direction. The surface forms, in the longitudinal direction, a plurality of adjacently arranged breaks which, when viewed in the circumferential direction, are arranged in a staggered manner with respect to each other.
