Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
  • B41L13/00—Stencilling apparatus for office or other commercial use
  • B41L13/04—Stencilling apparatus for office or other commercial use with curved or rotary stencil carriers
  • B41L13/06—Stencilling apparatus for office or other commercial use with curved or rotary stencil carriers with a single cylinder carrying the stencil
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F13/00—Common details of rotary presses or machines
  • B41F13/02—Conveying or guiding webs through presses or machines
  • B41F13/025—Registering devices
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41L—APPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
  • B41L13/00—Stencilling apparatus for office or other commercial use
  • B41L13/16—Driving gear; Control thereof
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
  • B41P2233/00—Arrangements for the operation of printing presses
  • B41P2233/10—Starting-up the machine
  • B41P2233/13—Pre-registering

Definitions

• the invention relates to a method for pre-register setting according to the preamble of claim 1.
• Printing machines - and especially gravure printing machines - for multi-color printing apply the individual colors in individual printing units.
• the position of the images of different colors is regulated in the printing process by register regulations to each other.
• register marks are generally recorded and their distance kept constant.
• BESTATIGUNGSKOPIE Process parameters such as web tension and drying temperature as well as physical properties of the substrate such as its elastic modulus and its geometric dimensions.
• pre-register settings are usually made manually for a print job that is being prepared for the first time.
• the print images are printed on the web in a random position.
• the position deviation is then determined using a linear measure.
• This data is entered as correction values in the machine control, which uses this to determine and set a phase shift.
• the printed images are largely on top of each other.
• the time required and the amount of waste are disadvantageous in this process.
• Automated pre-register settings require the path length to be entered as the basis for calculating the phase position of the cylinders for the initial setup.
• the object of the present invention is to propose a more successful and quick pre-register procedure. This object is solved by the characterizing part of claim 1.
• the phase position of the cylinders is to be automatically adjusted to one another.
• the web is marked in front of the first printing unit.
• the brand runs with the web under any process conditions in printing operation through all printing units that end in a random phase.
• the brand is in every printing unit locally recognized and the phase position of the assigned printing cylinder is determined simultaneously.
• a first cylinder forms the target phase position with respect to the print mark, further cylinders show different phase positions when the mark arrives.
• the mark is preferably an adhesive tape which acts as a change in web thickness in the printing gap between the impression cylinder and impression roller and interferes with the web transport and the rotation of the impression cylinder.
• Such discontinuity / bulge leads to a change in speed in the drive train of the individually driven printing cylinder and thus to a deviation of the actual position from the target position of the cylinder (following error).
• Control circuits in modern drives compensate for this deviation by an increase in the motor current, which leads to a higher drive torque.
• the measured variables tracking error, position, speed, acceleration, motor current and torque thus mark the arrival of the mark in the pressure gap by changing its size. An additional sensor is not required. Indirect measurements can be calculated.
• an adhesive tape can also be an adhesive point between two webs.
• a passage of adhesive tape in the pressure nip leads in a simplified manner to a torque curve in the drive as shown in FIG. 1.
• the first increase in the torque curve is suitable for recognizing the brand entry as well as a first maximum or derived quantities.
• the following signal sequences are typically covered by transient processes.
• the local resolution is determined by the quality of the signal rise and the sampling times of the drive control loops in connection with the path speed.
• the mark can also be detected with an additional sensor.
• the brand run can be recognized as follows:
• the adhesive strip raises the impression roller by a few 1/10 mm.
• a position transducer can record this change in position (distance sensor, initiator, drag pointer, rotation angle transducer on differential gear ).
• distance sensor e.g., a distance sensor
• initiator e.g., a sensor that uses a laser beam to record this change in position
• drag pointer e.g., a sensor that uses a laser beam to record this change in position
• rotation angle transducer e.g., rotation angle transducer on differential gear
• capacitive detection is also listed here.
• the change in capacity between the grounded pressure cylinder and the semiconducting impression roller (ESA) can be determined.
• An adapted adhesive label can also lead to a change in current or voltage in the ESA circuit, which is recognized as a label pass.
• An acceleration sensor can detect the jerky lifting of the impression roller.
• a pressure measuring device which monitors the impression pressure, can detect the lifting of the impression.
• An adhesive tape on the back of the substrate, which is in particular colored i, can also be reliably recognized with a so-called color sensor.
• a disadvantage of a sensor system outside the pressure gap are errors in the assignment of the phases of the pressure cylinders, for. B. by different impression diameter. This error occurs with the above. Procedure does not arise and is seen as an advantage.
• Fig. 1 The course of the moment when driving a printing or counter-pressure roller when passing a raised marking.
• Fig. 2 View of a gravure printing machine
• the graph G shows an example of the course of the torque M against the time t.
• the torque applied by the drive of at least one of the two drives forming the roll nip reaches the raised one when it enters
• FIG. 2 shows a sketched side view of a series gravure printing press 1 which is provided with a pre-register setting according to the invention.
• Four inking units F1 to F4 are shown, of which only the impression rollers P1 to P4 and the printing rollers D1 to D4 are shown.
• the gravure printing machine is equipped with an embodiment of the pre-register setting according to the invention.
• the more precise design of the features of the rotogravure printing machine that are not according to the invention, such as, for example, their equipment with only four inking units - which is inadequate for modern packaging printing - has only an exemplary character here.
• printing material 4 is unwound from the unwinding or supply roll 2 and is first fed via guide rollers 3 to the advance 14, of which 14 the pressure roller 10a and the advance roller 10b are shown stylized.
• the preference 14 also has the preference printing unit 5, which is configured here - as an example - as a flexographic printing unit. Accordingly, the format cylinder 22 and the anilox roller 23 and the doctor chamber 24 are shown as components of the preferred printing unit.
• other printing units, automatic or manual labelers or even punching devices are also suitable for carrying out a method according to the invention. The location at which this "pre-marking" of the web takes place is actually arbitrary.
• the preferred printing unit applies a web marking (not shown) to the printing material web 4.
• the material web 4 is fed and printed on the measuring roller 26, which measures the web tension and various guide rollers 3, to the printing units D1 to D4.
• the printing press 1 shown is a series gravure printing press, in which the invention can be used particularly well, these printing units D1 to D4 consist of impressioners P1 to P4 and format cylinders F1 to F4, which are used for the purposes of this application, printing rollers to be named.
• sensors 11 are mounted in front of the respective inking units F1 to F4 in the transport direction of the printing material web 4. These sensors 11 transmit to the computing unit (not shown) the point in time at which the marking passes the respective measuring points. Other preferred exemplary embodiments of the invention make use of other sensors at this point.
• a computing unit determines the difference in the angular position of the various cylinders at the point in time at which the at least one marking passes through the respective printing unit. Correction signals are then generated, which set the relative angular position of the printing rollers and / or the path between the different printing units. The latter can be done in the machine shown, for example, by changing the positions of the guide rollers 3.
• DE 101 45 957 A1 shows a number of adjusting mechanisms and drives which play a role in printing machines - in the case mentioned a central cylinder flexographic printing machine.
• the aforementioned application also shows how the actuators can be connected to control devices.
• the drives are often directly networked with control devices that have computing units. Therefore, the graphic representation of control and computing units and their connection to actuators of the printing press can be omitted at this point.
• the printed substrate is fed in a known manner via the guide rollers 3 to the feed 13, which consists of the pressure roller 6a and the feed roller 6b. Then the Printing material via the guide roller 3 for winding 7, in which it 4 is wound up and stored.
• the printing nip or nip is the nip between any roller bearing a printed image and a counter surface. It is emphasized here that a blanket cylinder, which does not transport a printing form but only an impression of the same, also carries a printed image in the sense of the present application. In the exemplary embodiment shown in FIG. 2, the printing nip can be found between the printing rollers D1-D4 and the respective impression rollers P1-P4.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Inking, Control Or Cleaning Of Printing Machines (AREA)
• Pulse Circuits (AREA)
• Valve-Gear Or Valve Arrangements (AREA)
• Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
• Treatment Of Liquids With Adsorbents In General (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=32318655

Family Applications (1)

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• 2002
  • 2002-11-22 DE DE10254836A patent/DE10254836A1/de not_active Ceased
• 2003
  • 2003-11-12 AU AU2003296583A patent/AU2003296583A1/en not_active Abandoned
  • 2003-11-12 AT AT03811760T patent/ATE496768T1/de active
  • 2003-11-12 EP EP03811760A patent/EP1572457B1/fr not_active Expired - Lifetime
  • 2003-11-12 ES ES03811760T patent/ES2358104T3/es not_active Expired - Lifetime
  • 2003-11-12 WO PCT/EP2003/012865 patent/WO2004048093A2/fr not_active Application Discontinuation
  • 2003-11-12 US US10/535,910 patent/US7555985B2/en active Active
  • 2003-11-12 DE DE50313443T patent/DE50313443D1/de not_active Expired - Lifetime
  • 2003-11-13 AU AU2003292033A patent/AU2003292033A1/en not_active Abandoned
  • 2003-11-13 WO PCT/EP2003/012824 patent/WO2004048092A2/fr not_active Application Discontinuation

Non-Patent Citations (1)

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