摘要:
A control device for removing register errors on printing machines. The control device for controlling the printing drums for a printing machine has at least a first sensor to detect sheets on a conveyor belt and printing drums to apply printing images, whereby a spacing, which is defined between a position on the conveyor belt determined by a signal of the first sensor and the nip of a printing cylinder on the conveyor belt, corresponding to a whole-numbered multiple of the circumference of a nip roller.
摘要:
A printing unit (1) for a printing machine, having an image cylinder (2), an image generating device (3) for setting an image on the peripheral surface (4) of the image cylinder (2), and an image transfer cylinder (5) which transfers the image from the image cylinder (2) to a printing substrate (6), the image transfer cylinder (5) having a resilient cover (7) which exhibits a deformation (10, 10′) in the force transmission areas (8, 9), and a transport belt (11) that carries the printing substrates (6) and is supported by a back-pressure cylinder (12) driving the image transfer cylinder (5) and the latter driving the image cylinder (2), by friction. The printing unit has a continuous image cylinder speed (v(ü)). This is achieved by the back-pressure cylinder (12) being mounted such that it can be displaced with respect to the image transfer cylinder (5) with a travel-dependent pressing force (F(s)) which is dimensioned such that the speed of the image cylinder (2) remains constant with respect to changes in the effective radius (r) for driving the image transfer cylinder (5).
摘要:
Setting registration, with detection of the entry of a printing substrate (2) into a printing machine (1) and calculation of the beginning of digital production of color separations (3, 3′, 3″, 3′″) to achieve an in-register position of the color separation prints (4, 4′, 4″, 4′″) on a printing substrate (2). This is achieved by the printing substrate (2) being detected before it enters the printing machine (1) and, following this detection, the relative positions of the color separations (3, 3′, 3″, 3′″) being calculated, and by precise detection of the leading edge (5) of the printing substrate (2) being performed as it enters the printing machine (1) and being made the basis for determining the starts of the production of the color separations (3, 3′, 3″, 3′″), their relative position having been precalculated.
摘要:
A method and apparatus for setting registration in a multicolor printing machine for the digital production of color separations, the actions of setting up and combining color separations being controlled when printing substrates of a different grade are fed in, in order to correct registration setting. In the event of a change in the printing substrate grade, the influence of this change on registration can be compensated for optimally before the printing substrate (16) is fed to the printing process. When the printing substrate grade is changed, the influence of all the properties of the printing substrate (16) that are relevant to registration is taken into account directly as the change is implemented, by correction values (4, 4′, . . . ) for the printing substrate (16) that are available before printing is carried out.
摘要:
A method and apparatus for setting registration in a multicolor printing machine having a number of exposure devices for the digital production of color separations, the actions of setting up and combining the color separations being controlled, in order to set the registration, in such a way that accurate registered prints are achieved. According to the invention, in the event of a change in the toner profile, the influence of the toner profile on the registration is taken into account, by available influencing variables directly as the change is implemented.
摘要:
A device for conveying thin workpieces in a machine used in printing technology, which device includes at least one moving conveying element, on whose surface are formed areas of changing charge density, the adherence of the workpiece on the conveying element being supported by electrostatic forces wherein contacts are provided for forming the areas of changing charge density, the contacts touching the conveying element and being connected to at least one voltage source, and an electric current flow being present, via the contacts in the material of the conveying element.
摘要:
An engine-driven vehicle/implement coupling system includes a mechanical coupling and one or more electronic and/or hydraulic connections. A coupling condition monitoring system includes one or two electronic control units, sensors for sensing a coupling condition of the electronic and/or hydraulic connection, and a sensor on the mechanical coupling for generating a signal representing a coupling condition of the mechanical coupling. Sensor signals are transmitted to the electronic control unit which, in response prevents erroneous coupling or uncoupling and prevents drive-away of the vehicle or implement.
摘要:
A process and printing machine for determining registration errors and correcting therefore. At least one first registration mark is applied onto a conveyor belt for transporting a sheet, and at least one second registration mark is applied onto the sheet adjacent to the first registration mark. The first registration mark and the second registration mark are detected, the distance between the first registration mark and the second registration mark is calculated, and the difference between the calculated distance and a distance without different speeds of the conveyor belt and the sheet (a target value) is calculated.
摘要:
A method and apparatus for setting register on a multicolor printing machine (1) having color printing units (6, 6′, 6″, 6′″) assigned to various printing inks, at least one image cylinder (2, 2′, . . . ), image production equipment (3,3′, . . . ) for producing color separations (7, 7′, . . . ) on the at least one image cylinder (2, 2′, . . . ) and a carrier (4) for printing substrates (15). An assignment of the image production points (11, 11′, . . . ) on the at least one image cylinder (2, 2′, . . . ) is carried out in order to achieve coincidence of register between the color separations (7, 7′, . . . ) in the print, by both the production of the image starts (10) and the production of areas (10′, 10″, . . . , 10n) of the color separations (7, 7′, . . . ) set on the basis of the print and the evaluation of register marks (9, 9′, 9″, 9′″).
摘要:
A method for sensing a register discrepancy (r) in a multi-color printed item, the position of at least one register mark (1, 1′) that is associated with one color being sensed with respect to the position of at least one register mark (2, 2′) that is associated with at least one further color, and any density register discrepancy (r) using a measurement window being ascertained from discrepancies in the actual relative position (3) with respect to the reference relative position (4). The invention, furthermore, concerns an apparatus, a register control system, and register marks (1, 1′, 2, 2′).