摘要:
A method for determining setting errors in a sheet-fed printing press includes recording a geometry of a printed sheet running through the printing press with an imaging system and comparing the recorded geometry with intended geometries for evaluation. An imaging system oriented substantially perpendicular to a sheet surface at least partly registers visible contours of sheet edges and conclusions are drawn, from measured deviations of the sheet edges in relation to intended contours, as to at least one of the following setting errors of the printing press: a faulty sheet transfer because of an incorrect setting of a gripper bar transporting the sheet, a lifting of the sheet off an impression cylinder because of an incorrect setting of blown air for sheet guidance, or an incorrect radius of the impression cylinder, for example because of incorrectly chosen underlays/cylinder covers.
摘要:
A method and an apparatus for laterally aligning a sheet in a processing machine, in particular a printing machine, carries out lateral sheet alignment on a cylinder of the printing machine, e.g. a feed cylinder. In order to achieve large correction distances in relation to a possible lateral movement capability of a gripper bar, the latter is prealigned prior to correction in such a way that, in the event of deviation from predetermined desired values, it is prealigned laterally to defined positions. A sheet-fed rotary printing machine having the apparatus, is also provided.
摘要:
In the case of a sheet-transporting gripper configuration in a sheet-processing machine, e.g. printing machine, it is provided that a low-mass gripper housing contains thin side walls enclosing a gripper shaft such that imaginary extensions of leaf springs provided intersect at a point on a straight line which passes through gripper tips and a gripper-shaft axis. The point of intersection is located on the far side of the gripper-shaft axis, as seen from the gripper tips.
摘要:
A method of aligning flat copies in a sheet-processing machine includes the steps of determining the actual position of a sheetlike material in relation to a coordinate system; implementing a nominal position of a cylinder that accommodates the sheetlike material to be aligned on the jacket surface of the cylinder by correctively controlling non-contacting radial/axial magnetic bearings so as to compensate for position changes of the cylinder or components thereof from the nominal position; and maintaining the cylinder in the nominal position thereof until the aligned sheet material is transferred to transport units arranged farther downline; a device for performing the method; a printing unit having the device; and a multicolor rotary printing machine having the device.
摘要:
A print finishing method, including feeding sheet-type printing products, laminating, coating and foil-stamping, with the steps being carried out in treatment modules and the printing product (D) to be finished being first detected and aligned in every treatment module. Also, a print finishing machine for sheet-type printing products (D), with a sheet-conveying system (11); a laminating device for laminating the printing product (D) with a laminating film; a coating device for coating the printing product (D) with a coat, and a foil-stamping device for transferring a transfer layer which adheres to a carrier film onto the printing product (D) in places intended to be imprinted. The laminating device (2), the coating device (3) and the foil-stamping device (4) each contain at least one section of the conveying system (11) and the sections of the conveying system are suction feedboards (21, 31, 41).
摘要:
A device for aligning sheets prior to transferring the sheets to a sheet-processing machine includes at least one sheet-gripping device by the aid of which the sheet to be aligned is displaceable, the sheet-gripping device having at least one positioning table displaceable by an actuating drive in at least one of a sheet travel direction, transversely to the sheet travel direction, and in a direction wherein it is pivoted about an axis extending in a direction orthogonal to the sheet travel direction, the sheet to be aligned being fixable on the positioning table; and a method for aligning sheets by the device.
摘要:
A device for conveying and aligning a sheet in a sheet-processing machine, with at least one frictionally driven ball having a dome facing towards the sheets for engaging a broad surface of the sheet and for moving the sheet in its plane includes structure for supporting the ball so that it is rotatable in all directions about a fixed mid-point thereof, and at least two frictional-force transmission locations located at the periphery of the ball and disposed at least 90.degree. from one another.
摘要:
This invention provides a sheet transfer mechanism for sheet fed rotary printing presses. A conventional transfer drum is provided with an angular lever mechanism for controlling the axial direction of the transfer drum. The angular lever mechanism is operated in conjunction with a control gear mechanism to provide separate operations on specific revolutions of the transfer drum. Gripper support spindles are mounted on the transfer drum with a control gear mechanism to effect a shift in a substantially circumferential direction to place the sheet being transferred in the desired position with respect to the transfer drum.
摘要:
A method and an apparatus for laterally aligning a sheet in a processing machine, in particular a printing machine, carries out lateral sheet alignment on a cylinder of the printing machine, e.g. a feed cylinder. In order to achieve large correction distances in relation to a possible lateral movement capability of a gripper bar, the latter is prealigned prior to correction in such a way that, in the event of deviation from predetermined desired values, it is prealigned laterally to defined positions. A sheet-fed rotary printing machine having the apparatus, is also provided.
摘要:
A device for correcting the lateral position of a printing substrate, preferably a sheet of paper, held by a gripper bar and conveyed in a transporting direction has a linear drive that includes a first primary part and a first secondary part configured as a first carriage and associated with the first primary part, and a second secondary part configured as a second carriage. The first carriage and the second carriage are arranged on the same side of the printing substrate in the lateral direction and—to correct the position of the printing substrate in the lateral direction—are movable relative to each other in the direction of transport. Such a device may be used for transporting printing substrates and for correcting the register position of printing substrates in machines for processing printing substrates, preferably printing presses or machines for the further processing of printed products. The relative movement of the two carriages with respect to each other initiates a lateral movement of the gripper bar without influencing the advancement of the printing substrate.