摘要:
A supporting or guiding device for sheets in a sheet processing machine includes a supporting or guiding layer having a supporting or guiding surface formed with a plurality of outlet openings for applying a throttled air flow therethrough to a respective sheet. A covering plate is spaced away from the supporting or guiding surface, and at least two intermediate layers are formed with a plurality of openings and disposed between the supporting or guiding surface and the covering plate. The covering plate is connected via a plurality of inlet openings to at least one blast air source. A respective opening formed in one of the intermediate layers is connected to two respective openings formed in the other of the intermediate layers, and an opening formed in the other intermediate layer is connected to two respective openings formed in the one intermediate layer, between one of the respective inlet openings and one of the respective outlet openings associated therewith.
摘要:
The present invention provides a method for operating a sheet-fed offset press so as to reduce the occurrence of spoilage caused by nonuniform printing. In this method, the timing of start of oscillating motion of oscillating rollers is regulated. Also, the present invention provides an oscillation mechanism for a sheet-fed offset press, in which less failure and wear occur, and a smaller force is required to accomplish a changeover from transmission to stoppage of oscillation and vice versa.
摘要:
A rotary printing machine is disclosed in which the timing of the sheet feeding is adjustable as a function of the thickness of the selected printing plate.
摘要:
The rotation angle position of a moveable component, such as a cylinder, is detected or determined through a method in which the detected rotation angle position is modified using a correction value when the moveable component is in a second position.
摘要:
A cylinder of a rotary printing press is driven by a hollow shaft electric motor. The cylinder is supported in eccentric bushings and can be re-positioned. A coupling assembly, that includes two couplers and a connector shaft, is used to connect the shiftable cylinder to the fixed motor.
摘要:
A guiding device for an areal printing material, the guiding device having an areal structure with a guide surface facing towards the printing material, and wherein the areal structure includes a supporting layer, and a surface layer is provided for forming the guide surface and covering the supporting layer; and a rotary printing machine equipped with the guiding device.
摘要:
A method of operating a sheet-fed rotary printing machine includes mounting at least one rotating cylinder to be coupled to a drive or fixed relative to a framework, and moving an actuator to both uncouple the cylinder from the drive and fix the cylinder relative to the framework. A sheet-fed rotary printing machine includes a framework, a drive, at least one cylinder rotatably mounted to the framework, the cylinder is to be coupled to the drive or fixed relative to the framework, and a fixing and coupling configuration connected to the cylinder to both uncouple the cylinder from the drive and fix the cylinder relative to the framework.
摘要:
A printer has a media transport with a rigid, air-transmissive platen. A movable air-transmissive flexible web overlays the platen. A suction device communicates with the platen to draw air through the web and through the platen such that a sheet of media carried on the web is biased toward the platen. A valve sheet overlays or underlies the platen, and includes a plurality of shut-off elements, each movable in response to temperature changes between a closed position in which the element contacts a portion of the platen to prevent air flow through that portion of the platen, and an open position, in which the element is spaced apart from the platen to admit air to the platen portion. The shut off elements may include resistive heaters and bimetallic strips, so that application of electricity generates heat to flex the strip to an open position.
摘要:
A printing cylinder has a first rotatable section having a central image area on the surface, and a first and second end. A first shell is disposed circumferentially about the first end, and a second shell is disposed circumferentially about the second end, the first and second shells having image areas on the surface and movable axially with respect to the central image area. Also provided is a printing press comprising a first sensor for detecting register marks, a second sensor for detecting fanout, and a rotatable cylinder with a first section axially adjustable with respect to a second section. A method for correcting fanout in a web printing press includes sensing register marks to provide overall circumferential and/or lateral register adjustments of a printing cylinder, sensing a section of the web other than the register marks to provide fanout information, and changing a lateral position of a first part of the printing cylinder with respect to a second part of the printing cylinder.
摘要:
A printing-material sheet processing machine includes at least one processing unit with an impression cylinder and a tool-carrying cylinder bringable into contact with the impression cylinder, the tool-carrying cylinder having at least one tool selected from the group of tools consisting of respective deforming and separating tools for the printing-material sheets, the processing unit also having a circumferential-register adjusting device and a lateral-register adjusting device, which are assigned to the tool-carrying cylinder for adjusting the register thereof, and having a diagonal-register adjusting device assigned to a sheet transport cylinder for adjusting the register thereof, the sheet transport cylinder being disposed for transferring the printing-material sheets to the impression cylinder.