摘要:
A method for imaging a printing form (10) using at least one controllable light source (42) is described, a number of image spots (20) being generated at a number of positions on the printing form (10) in accordance with image data in a bit field, by the controlled action of light on the printing form (10), the intensity of the light acting at at least one of the positions of the image spots (18) being controlled as a function of the value of a measure for the number of the image spots (24) to be generated in one surrounding area (22) of the position. The method may be implemented in a device for imaging a printing form (10), having at least one controllable light source (42) and a control unit (50) including a processor (52) and a memory unit (54) in such a way that a program for executing the method is stored in the memory unit (54) and may be executed in the processor (54). The device may be used in a print unit (58) of a printing press (60).
摘要:
A rotary printing machine includes at least one form cylinder, at least one further cylinder, and a gear transmission via which the form cylinder and the further cylinder are drivable together during a printing operation. A device is provided for setting an image on a printing form located on the form cylinder. A switchable speed-change gear mechanism is disposed between the form cylinder and the gear transmission for driving the form cylinder during the printing operation.
摘要:
A method and a diagnostic device for a printing press are described, wherein data is automatically transmitted by a central data processor of the printing press to a locally distanced central data processor when a threshold value is upwardly transgressed, downwardly transgressed or reached. The data is preferably assessed prior to the evaluation and/or the transmission to the remote central data processor. In this way, a simple telediagnostic service of the printing press is possible.
摘要:
A sheet-processing assembly includes an apparatus for transporting a pallet bearing a sheet stack and a transfer conveyor having a number of transport rollers disposed transversely to the direction of transport of the pallet and a receiving fixture for a load-bearing element for the pallet, for example a lift truck fork. The receiving fixture is aligned parallel to the transport rollers. A conveying system having a transfer conveyor and a sheet-fed rotary printing press having a conveying system, are also provided.
摘要:
A method for driving a printing press includes driving, in a printing operation, via a gear train by at least a first motor, at least one drum for advancing printing material and a printing-form cylinder, processing angle-of-rotation signals of the drum in a control device for controlling the driving of the drum and the form cylinder, and driving, in a printing-form production operation in the printing press, a printing-form cylinder by a separate motor. The method further includes, in an operation for producing the printing form, synchronously actuating the first motor and the separate motor by providing a gear allocated to the driving of the printing-form cylinder, and an adjacent gear allocated to the driving of the drum of the gear train, the gears being disposed relative to one another at the most out of contact with one another, and at the least barely in engagement with one another so as to exert a slight pressure on one another, and a device for performing the method.
摘要:
Wash-up assembly for washing printing units and adjacent regions in a rotary printing press having printing units including a printing-form cylinder and a blanket cylinder cooperating with an impression cylinder, and a wash-up device assigned to each printing unit for washing the outer cylindrical surface of at least one of the respective printing-form cylinder and the respective blanket cylinder thereof, further includes a sucking unit assigned to a respective printing unit in a wedge-shaped nip region between the respective printing-form cylinder and the respective blanket cylinder thereof, the sucking unit having at least one opening directed substantially towards respective outer cylindrical surfaces of the respective printing form and blanket cylinders.
摘要:
A sheet-processing assembly includes an apparatus for transporting a pallet bearing a sheet stack and a transfer conveyor having a number of transport rollers disposed transversely to the direction of transport of the pallet and a receiving fixture for a load-bearing element for the pallet, for example a lift truck fork. The receiving fixture is aligned parallel to the transport rollers. A conveying system having a transfer conveyor and a sheet-fed rotary printing press having a conveying system, are also provided.
摘要:
An apparatus for ejecting sheets from a sheet transport path onto an auxiliary stack disposed upstream of a main stack, includes a planar sheet guide surface having a sheet ejection opening formed therein. The sheet ejection opening is closed by a sheet separating element and a flap, in a closed state. The separating element and the flap also serve as guide elements during the ejection of sheets.
摘要:
A write head of an imaging system for producing a printing plate can be calibrated quickly, simply and without errors. Test patterns are produced with the write head, the deviation of a property of the write head from a reference value is determined, and a corrective parameter in the write head is adjusted in order to compensate for the deviation. Test patterns that can be evaluated visually with regard to the writing quality are produced in a plurality of test fields with different parameter values, an identifier that can be picked up visually is produced with each test field, and the identifier of the test field which appears best in terms of quality is entered into a control device for the write head. The printing plate is produced by using the entry of the identifier for automatically setting the parameter value with which the best test field was produced.
摘要:
An apparatus for producing a printing form which, with little expenditure, permits exact beam alignment and positioning. The apparatus for producing the printing form contains a holder for at least one printing form blank, and at least one imaging module, which can be moved relative to the printing form blank and which contains at least one radiation source which, in order to produce image elements that accept printing ink, is aimed at the surface of the printing form blank and whose beam direction can be adjusted. The imaging module being accommodated in a six-point mounting in three bearing locations, each bearing location containing a spherical element and an associated bearing element and in each case the spherical element rests on it and, in order to adjust the beam direction, at least one element of one bearing location being disposed adjustably.