Abstract: A digital printing machine includes at least one print head for inkjet printing, a drum for transporting printing material, and a spittoon for collecting ink coming from the print head. The drum has a mounting for the spittoon. The spittoon includes a support and an absorber fixed thereto. The absorber is quasi flush with the outer circumference of the drum, and the support and the absorber together form a replaceable disposable unit. A spittoon for use in a digital printing machine is also provided.

Abstract: A sheet-transporting drum includes sheet-supporting areas each being formed of a first comb segment and a second comb segment having segment teeth. At least one of the comb segments is rotatable for adaptation to a sheet format. A mechanical leading-edge gripper is provided on the first comb segment and a pneumatic trailing-edge gripper is provided on the second comb segment. A mechanical trailing-edge gripper is additionally disposed on the second comb segment and is deactivatable in particular by format adjustments. This advantageously allows either the trailing edge of a sheet to be securely held down mechanically or a full-bleed print to be applied to the sheet when the trailing edge of the sheet is held down pneumatically. A sheet-fed printing machine is also provided.

Abstract: A sheet-transport drum includes at least two sheet-supporting surfaces with suction openings. Each respective sheet-supporting surface is formed of first and second comb segments with segment teeth. Suction grooves are provided in the segment teeth and a trailing-edge suction groove is provided in the sheet-supporting surface of each respective second comb segment. A rotary valve is provided for a timed supply of suction air. A plurality of vacuum sources is provided and a trailing-edge suction groove is assigned to each respective vacuum source by the rotary valve. This ensures that the vacuum provided by a respective trailing-edge suction groove at the trailing edge of a respective sheet is reliably maintained even if a previous or following sheet is missing. A sheet-fed printing machine with the sheet-transport drum is also provided.

Abstract: A digital printing machine includes at least one print head for inkjet printing, a drum for transporting printing material, and a spittoon for collecting ink coming from the print head. The drum has a mounting for the spittoon. The spittoon includes a support and an absorber fixed thereto. The absorber is quasi flush with the outer circumference of the drum, and the support and the absorber together form a replaceable disposable unit. A spittoon for use in a digital printing machine is also provided.

Abstract: A sheet-transport drum includes at least two sheet-supporting surfaces with suction openings. Each respective sheet-supporting surface is formed of first and second comb segments with segment teeth. Suction grooves are provided in the segment teeth and a trailing-edge suction groove is provided in the sheet-supporting surface of each respective second comb segment. A rotary valve is provided for a timed supply of suction air. A plurality of vacuum sources is provided and a trailing-edge suction groove is assigned to each respective vacuum source by the rotary valve. This ensures that the vacuum provided by a respective trailing-edge suction groove at the trailing edge of a respective sheet is reliably maintained even if a previous or following sheet is missing. A sheet-fed printing machine with the sheet-transport drum is also provided.

Abstract: A sheet-transporting drum includes sheet-supporting areas each being formed of a first comb segment and a second comb segment having segment teeth. At least one of the comb segments is rotatable for adaptation to a sheet format. A mechanical leading-edge gripper is provided on the first comb segment and a pneumatic trailing-edge gripper is provided on the second comb segment. A mechanical trailing-edge gripper is additionally disposed on the second comb segment and is deactivatable in particular by format adjustments. This advantageously allows either the trailing edge of a sheet to be securely held down mechanically or a full-bleed print to be applied to the sheet when the trailing edge of the sheet is held down pneumatically. A sheet-fed printing machine is also provided.

Abstract: An apparatus for turning a sheet during transport through a printing press provides better printed results as a result of improved sheet guidance. A transfer drum has gripper systems disposed in channels for holding the sheet at the leading and trailing sheet edge, and guide elements covering the channels.

Abstract: A method and an apparatus for turning a sheet during its transport through a printing press permit improved printing results as a result of improved sheet guidance. A sheet is tautened following a transfer from a first transport device to a second transport device.

Abstract: An apparatus for turning a sheet during transport through a printing press provides better printed results as a result of improved sheet guidance. A transfer drum has gripper systems disposed in channels for holding the sheet at the leading and trailing sheet edge, and guide elements covering the channels.

Abstract: A method and an apparatus for turning a sheet during its transport through a printing press permit improved printing results as a result of improved sheet guidance. A sheet is tautened following a transfer from a first transport device to a second transport device.

Abstract: A transfer drum for conveying a sheet has an outer contour which can be set within a turning apparatus as a function of a setting of a turning operation. A flexible plate forms an outer contour of the drum which acts for sheet guidance. The plate is connected to a drum body through at least one joint, and an apparatus for adjusting a relative position acts at ends of the plate. The ends lie in such a way that they face a gripper system.

Abstract: A method of varying a drum profile of a vario drum for transporting printing material sheets, in which shell segments of the vario drum are pivoted inward and outward. Sheet supporting elements assigned to the shell segments are reversibly deformed by pivoting the shell segments. A vario drum suitable for implementing the method and a machine containing the vario drum for processing printing material sheets contain the shell segments and the associated sheet supporting elements.

Abstract: In a method of operating a machine processing printing material sheets and having a sheet transport drum in various operating modes, drum circumferential shells are kept fixed on the sheet transport drum in an outer position in a first of the operating modes and in an inner position in a second of the operating modes. During a drum conversion to be carried out before the start of a third of the operating modes, the drum circumferential shells are removed from the sheet transport drum and, in this third operating mode, the sheet transport drum is rotated without the drum circumferential shells.

Abstract: In the region of a turner device in a sheet processing machine, a sheet-guiding device is disposed at a great spacing from the turner drum on the other side of a common tangent between a turner drum and a transfer drum.

Abstract: A device for torque compensation in a sheet-processing machine includes a cam-controlled compensating mechanism having an energy storage device for exerting a force, a cam disk, and a cam follower to be thrown onto the cam disk by action of the force from the energy storage device. At least one actuating element locks the cam follower in a rest position. A reversing drum with a torque compensation device is also provided.

Abstract: In a method of operating a machine processing printing material sheets and having a sheet transport drum in various operating modes, drum circumferential shells are kept fixed on the sheet transport drum in an outer position in a first of the operating modes and in an inner position in a second of the operating modes. During a drum conversion to be carried out before the start of a third of the operating modes, the drum circumferential shells are removed from the sheet transport drum and, in this third operating mode, the sheet transport drum is rotated without the drum circumferential shells.

Abstract: A method of varying a drum profile of a vario drum for transporting printing material sheets, in which shell segments of the vario drum are pivoted inward and outward. Sheet supporting elements assigned to the shell segments are reversibly deformed by pivoting the shell segments. A vario drum suitable for implementing the method and a machine containing the vario drum for processing printing material sheets contain the shell segments and the associated sheet supporting elements.

Abstract: In the region of a turner device in a sheet processing machine, a sheet-guiding device is disposed at a great spacing from the turner drum on the other side of a common tangent between a turner drum and a transfer drum.

Abstract: A device for torque compensation in a sheet-processing machine includes a cam-controlled compensating mechanism having an energy storage device for exerting a force, a cam disk, and a cam follower to be thrown onto the cam disk by action of the force from the energy storage device. At least one actuating element locks the cam follower in a rest position. A reversing drum with a torque compensation device is also provided.

Abstract: A device for reducing the noise emissions of a machine for printing flat material, wherein flat material is transportable across an impression cylinder, comprising at least one muffling element disposed across a portion of a transport path of the flat material extending along the impression cylinder, directly behind or downline from a nip, as viewed in the direction of the transport path, and at a spaced distance from the impression cylinder; and a machine including the device.