Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F33/00—Indicating, counting, warning, control or safety devices
  • B41F33/0036—Devices for scanning or checking the printed matter for quality control
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F13/00—Common details of rotary presses or machines
  • B41F13/08—Cylinders
  • B41F13/10—Forme cylinders
  • B41F13/12—Registering devices

Definitions

• the invention relates to a method for register control according to the preamble of claim 1.
• a partial printing image is applied in a special ink on the sheet.
• the sheets are preferably moved by four successively arranged printing units, wherein in each of the printing units, a partial printing image in the printing inks cyan, magenta, yellow and black is applied to the sheets. Accordingly, when printing multicolor print images on the print sheets, various partial print images must be made to coincide with each other. The same applies if the print sheet is printed in a coating unit with a partial print image of paint.
• modified setpoint values are determined from actual register values, register setpoints and adjustment ranges for the drives of the register adjustment devices, wherein the register adjustment devices of all printing units involved in the printing are adjusted together.
• the present invention is based on the problem to provide a novel method for register control.
• This problem is solved by a method for register control according to claim 1.
• the complete print image composed of all partial print images and, on the other hand, at least one, preferably each, incomplete print image composed of a subset of all partial print images are measured in order to generate the register actual values.
• At least one incomplete print image which is composed of only a subset of all partial print images, is measured or analyzed in order to generate register actual values for the register control.
• This has the advantage that information about register deviations can already be obtained at a time when there is not yet a complete printed image. This can improve the register control. Furthermore, the printing of waste can be reduced.
• the present invention relates to a method for register control on a printing press, namely for circumferential register control and / or for side register control and / or for oblique register control, online during printing of a printed image on a substrate.
• the substrate For printing a printed image on a substrate, in particular on a printing sheet, the substrate is successively moved through a plurality of printing units connected in series, wherein a partial image is applied to the printing substrate in each printing unit. After applying all partial print images to the substrate, the complete print image is available. Upstream of the printing unit in which the last partial printing image of a printed image is applied to the printing material, there are incomplete printed images which comprise only a subset of the partial printed images of the complete printed image.
• the complete print image composed of all the partial print images is subjected to an analysis, so as to generate register actual values, the register actual values being compared with register set values, and based on these comparisons online during the printing, control signals for Drives corresponding register adjustment of the printing units are generated to correct online during printing possible deviations between register actual values and register setpoints.
• the measurement of the complete print image is carried out in the region or downstream of that printing unit on which the last partial print image is printed to complete the printed image.
• this printing unit is a corresponding measuring device, for. As a camera assigned.
• register control namely for determining the actual register values, not only measures the complete print image composed of all the partial print images, but also additionally at least one incomplete print image, which is composed of a subset of all partial print images.
• each incomplete print image takes place in the area of that printing unit at which the last partial image of the print image relevant to the respective incomplete print image is printed on the printing material.
• the corresponding printing unit is a measuring device, in particular a camera, assigned.
• each incomplete print image is measured to generate corresponding register actual values.
• register actual values can be generated for all printing units involved in the printing of the complete printing unit.
• register actual values for those printing units can be generated, which are involved in the printing of the respective incomplete print image or the partial print images of this incomplete print image.
• the transport speed of the printing substrate is adapted to the speed of the register control, namely the drives for the register adjustment devices, when starting the printing press, the waste can be limited to a single printed copy in the most favorable case.
• the transport speed of the printing material only has to be selected such that when a register deviation between partial printing images is detected at a printing unit by controlling the register adjustment the Register deviation can be corrected before further partial printing images are printed at the participating printing unit.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Quality & Reliability (AREA)
• Inking, Control Or Cleaning Of Printing Machines (AREA)

Applications Claiming Priority (1)

Publications (2)

Family

ID=39721964

Family Applications (1)

Country Status (2)

Citations (1)

Family Cites Families (6)

• 2007
  • 2007-06-08 DE DE102007026649A patent/DE102007026649A1/de not_active Withdrawn
• 2008
  • 2008-05-30 EP EP08157245A patent/EP2000306A3/fr not_active Withdrawn

Patent Citations (1)

Also Published As

Similar Documents

Legal Events