EP0454000A1 - Procédé et dispositif pour le positionnement d'un bloc détecteur - Google Patents

Procédé et dispositif pour le positionnement d'un bloc détecteur Download PDF

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Publication number
EP0454000A1
EP0454000A1 EP91106377A EP91106377A EP0454000A1 EP 0454000 A1 EP0454000 A1 EP 0454000A1 EP 91106377 A EP91106377 A EP 91106377A EP 91106377 A EP91106377 A EP 91106377A EP 0454000 A1 EP0454000 A1 EP 0454000A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
light spot
sensor device
measuring
light source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP91106377A
Other languages
German (de)
English (en)
Inventor
Helmut Prof. Dr. Kipphan
Gerhard Löffler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0454000A1 publication Critical patent/EP0454000A1/fr
Withdrawn legal-status Critical Current

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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
    • B41F33/0027—Devices for scanning originals, printing formes or the like for determining or presetting the ink supply
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0063—Devices for measuring the thickness of liquid films on rollers or cylinders

Definitions

  • the invention relates to a method for positioning the measuring field of a sensor device on a selected area of the lateral surface of a cylinder in a rotary printing press and a device for carrying out this method.
  • the method and device are explained using the example of a moisture measuring device, but are in principle also advantageous for other measuring tasks, such as. B. for register or color measurement.
  • the print quality is decisively influenced by the ink / dampening ratio. Since this ratio is not constant, but changes during the printing of a print, for example depending on the temperature and air humidity, it is essential to constantly check the color and water flow and readjust if necessary.
  • a separate measuring strip consisting of solid and grid fields, is usually also printed.
  • This so-called color control strip is measured using a densitometer or spectrophotometer.
  • a comparison of the z. B. measured values determined zone by zone with predetermined target values and a possibly necessary readjustment of the ink zone control elements enable constant ink guidance.
  • DE-OS 37 32 934 describes a sensor device for determining the amount of dampening solution on an offset printing plate.
  • This sensor device consists of a light source, optics, a receiving device and a Evaluation device.
  • the radiation from the light source is focused onto a color-free area of a printing plate which is clamped onto a plate cylinder of the printing press.
  • the reflected radiation is detected within a certain angular range by means of a diode row.
  • the measured values are evaluated over the third moment of the distribution, the so-called skewness.
  • This size is so sensitive to changes in the dampening solution layer thickness on the printing plate that regulation in the relevant ⁇ m range is possible.
  • the positioning of the measuring field of the sensor device on a color-free area of the printing plate ensures that - with knowledge of the distribution of the reflected light on the dry plate surface - changes in the measured values are exclusively due to changes in the dampening solution layer thickness.
  • the object of the invention is to propose a method and a device for carrying out the method, which on the one hand allow an exact positioning of the measuring field of the sensor device on the selected area and on the other hand ensure that the measurement is also carried out in the selected area while the machine is running.
  • the object is achieved in that a light spot of a pilot light source is directed into the selected area, the position of the light spot on the cylinder surface is stored in a computing / regulating device, and the sensor device is controlled in such a way that it delivers measured values from the selected area .
  • the pilot light source and the sensor device are arranged on a crossbar so as to be axially movable to the lateral surface of the cylinder.
  • An operating point is provided in the area of a printing unit, which enables a gradual cylinder rotation.
  • a rotary encoder is attached to a cylinder of the printing press.
  • a computing / regulating device stores the position of the selected area on the cylinder surface depending on the axial position and the angular position and controls the sensor device so that the measured values come from the selected area.
  • the measuring field required by the sensor device on the cylinder surface has a defined position with respect to the position of the light spot and that the offset between the position of the light spot of the pilot light source and the position of the measuring field is compensated for by computer control.
  • the light spot is aligned to the selected area by axially displacing the pilot light source and / or by rotating the cylinder.
  • the measuring device is mechanically or electromechanically on a Traverse shifted.
  • the cylinder is then rotated until the light spot is aligned with the selected area of the outer surface of the cylinder.
  • the cylinder is rotated in jog mode via an operating point which is arranged in the printing unit area.
  • the position of the area suitable for the measurement task is stored in a computing / regulating device as a function of the axial position and the angular position of the cylinder.
  • the angle information is provided by an encoder, which is preferably arranged on a single-speed shaft.
  • a position detector for example an incremental displacement sensor, provides information about the axial position.
  • sensor device and integrated pilot light source are arranged such that the center points of the light spot and measuring field lie on a circumferential circle of the cylindrical surface.
  • This arrangement eliminates the need for axial position detection, the storage of the axial position value and the automatic control, since a once-selected axial position of the pilot light source and sensor device is retained even when the measured values are recorded while the machine is running.
  • it is sufficient - depending on the relative position of the pilot light source and sensor device - to subtract or add the angle difference between the light spot and the measuring field from the known angular position of the light spot.
  • One embodiment of the method according to the invention provides for the shape of the light spot of the pilot light source to be adapted to the shape of the measuring field by means of suitable optics and to be expanded in such a way that even at maximum machine speed it is ensured that the measured values are obtained within the selected range.
  • FIG. 1 schematically shows a longitudinal section through a sheet-fed printing press 1 with two printing units 2, feeder area 3 and delivery area 4.
  • the sheets fed via the feed table 5 are gripped by the gripper system of the register feed drum 6 and transported through the printing press 1 via the printing cylinders 14, the transfer cylinders 7 and the turning drums 8.
  • the printing plate 10 clamped on the plate cylinder 9 is on the inking unit 11 and Dampening unit 12 colored or moistened.
  • the subject is transferred from the printing plate 10 to the rubber cylinder 13 and then printed on the sheet passing between the rubber cylinder 13 and the printing cylinder 14.
  • a rotary encoder 15 for example an incremental encoder, is attached to the register application drum 6. This rotary encoder 15 is of additional importance in connection with the present invention.
  • a moisture measuring device 16 is assigned to each of the plate cylinders 9.
  • the moisture measuring device 16 can be moved mechanically or electromechanically axially to the lateral surface of the plate cylinder 9 and thus to the clamped pressure plate 10 via a crossmember 17.
  • the plate cylinder 9 is rotated in jog mode via an operating point 18 arranged in the area of the printing unit 2 until the measuring device 16 is aligned with a visually selected, color-free area of the printing plate 10. Reaching the selected area suitable for the measuring task is entered by a corresponding key actuation at the control points 18 of the printing units 2.
  • a suitable measuring range can be selected separately for all printing units on one of the printing plates 10 or on each printing plate 10 of the printing units 2, since color-free areas in the individual printing inks can be quite different.
  • the position detection signals (as well as the measurement signals later) are forwarded to the machine control station 20 via a computing / regulating device 19, where they are assigned to the corresponding angular positions of the printing press 1 (machine positions) supplied by the rotary encoder 15.
  • the Computing / regulating device 19 calculates the angular difference or the temporal difference between reaching the entered angular position and the offset in time of the measured value transfer, i.e. if the measuring field 32 is within the selected one, from the known offset between the light spot 31 of the pilot light source 21 and the measuring field 32 of the moisture measuring device 16 Range.
  • the computing / regulating device 19 evaluates the measured values obtained at the right time (ie in the color-free range), for example using the third power of the distribution. If there are deviations from predetermined target values, corresponding moisture control signals are output to the dampening units 12 of the individual printing units 2 via the data lines 22, 23, 24, 25.
  • the method according to the invention also works when the pilot light source 21 and the moisture measuring device 16 are arranged independently of one another in front of the pressure plate 10 on at least one traverse.
  • the position data of the pilot light source 21 with respect to the surface of the printing plate 10 are fed to the computing / control system 19.
  • the moisture measuring device 16 is then moved in accordance with the axial position input on the crossmember 17.
  • the measured values are recorded by the moisture measuring device 16 each time the printing plate cylinder is in the angular position to which the selected pressure-free area of the printing plate 10 was previously assigned by the light spot 31 of the pilot light source 21.
  • Fig. 2 shows a cross section through the measuring device 16 according to the invention, which can be moved axially to the plate cylinder 9 via the cross member 17.
  • the moisture measuring device 16 consists of a sensor device 26 and an integrated pilot light source 21.
  • the sensor device 26 itself sets is composed of a light source 27, an optics 28 and a receiving device (optics and electronics) 29. Via the optics 28, the light beams of the light source 27 are focused in a region of the printing plate 10 and reflected from there at different angles.
  • the reflected radiation is detected over a certain angular range by means of a diode line 30, wherein when selecting the angular range it should be noted that in addition to the diffusely scattered radiation, the specularly reflected radiation component hits the diode line 30.
  • the center points of light spot 31 and measuring field 32 lie on a circumferential circle of the cylindrical surface at a distance A from one another.
  • the angle indication of the rotary encoder is sufficient - with knowledge of the offset of the light spot 31 and the measuring field 32 - in order to trigger the measured value transfer at the right time or in the correct machine position.
  • the radiation from the light source 27 of the sensor device 26 should as far as possible not influence the amount of dampening solution at the measuring point; on the other hand, in a limited angular range, the specularly and scatteredly reflected radiation portion should provide reliable information regarding the thickness of the dampening solution layer on the printing plate 10. It is therefore advantageous to bring the sensor device 26 as close as possible to the pressure plate 10. As a result, the view of the pressure plate 10 is inevitably restricted, so that an exact positioning of the Measuring field 32 of the sensor device 26 on the selected area is no longer possible.
  • FIG. 3 shows a plan view of a section of the printing plate according to FIG. 2.
  • the light spot 31 of the pilot light source 21 was visually aligned to a selected color-free area of the printing plate 10.
  • the type of light is advantageously chosen so that there is a good contrast to the printing plate surface. Due to the different arrangement of the pilot light source 21 and the sensor device 26, the center points of the light spot 31 and the measuring field 32 are offset from one another by the circular arc segment A.
  • the measurement is triggered according to a rotation angle corresponding to the circular arc segment A '.
  • a fixed time ⁇ t passes between the triggering of the trigger signal and the end of the measurement value acceptance.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP91106377A 1990-04-26 1991-04-20 Procédé et dispositif pour le positionnement d'un bloc détecteur Withdrawn EP0454000A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4013260 1990-04-26
DE4013260 1990-04-26
DE4106082A DE4106082A1 (de) 1990-04-26 1991-02-27 Verfahren und vorrichtung zum positionieren einer sensoreinrichtung
DE4106082 1991-02-27

Publications (1)

Publication Number Publication Date
EP0454000A1 true EP0454000A1 (fr) 1991-10-30

Family

ID=25892535

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91106377A Withdrawn EP0454000A1 (fr) 1990-04-26 1991-04-20 Procédé et dispositif pour le positionnement d'un bloc détecteur

Country Status (5)

Country Link
US (1) US5162865A (fr)
EP (1) EP0454000A1 (fr)
JP (1) JPH04229271A (fr)
CA (1) CA2039654A1 (fr)
DE (1) DE4106082A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1818176A3 (fr) * 2006-02-13 2010-12-01 National University Corporation Kyoto Institute of Technology Dispositif de mesure de quantité de d'eau de mouillage et procédé de réglage de d'eau de mouillage

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4218764A1 (de) * 1992-06-06 1993-12-09 Heidelberger Druckmasch Ag Verfahren zur Positionierung eines Registermarkensensors an einer Bogendruckmaschine
DE4444269A1 (de) * 1993-12-20 1995-06-22 Ryobi Co Feuchtevolumen-Steuerungsvorrichtung für eine Offsetpresse
DE19536296B4 (de) * 1995-09-29 2004-10-14 Daimlerchrysler Ag Signalmarken und Verfahren zu deren Identifizierung
DE19651193A1 (de) * 1996-12-10 1998-06-18 Roland Man Druckmasch Justiereinrichtung einer vor einem Zylinder einer Rotationsdruckmaschine angeordneten Traverse
SE0001808D0 (sv) * 2000-05-17 2000-05-17 Baldwin Jimek Ab A method for controlling fountain solution in a printing press
DE10211870B4 (de) 2001-03-29 2010-07-29 Heidelberger Druckmaschinen Ag Verfahren zur Justierung zweier aneinander anlegbarer Walzen eines Druckwerks
US6457801B1 (en) 2001-06-27 2002-10-01 Lexmark International, Inc. Method and apparatus for measuring ink dry time
US7522281B2 (en) * 2004-12-20 2009-04-21 Heidelberger Druckmaschinen Ag Apparatus and method for detecting moisture in a printing plate exposer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3444892A1 (de) * 1984-12-08 1986-06-12 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Feuchtmittelvorrichtung fuer das feuchtwerk einer druckmaschine
CH657317A5 (de) * 1981-09-16 1986-08-29 Roland Man Druckmasch Verfahren und vorrichtung zur herstellung passgenauer drucke in druckmaschinen.
DE3909401A1 (de) * 1989-03-22 1990-09-27 Heidelberger Druckmasch Ag Verfahren zur festlegung eines messortes fuer die feuchtmittel-schichtdickenbestimmung einer offset-druckplatte

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3220282C3 (de) * 1982-05-28 1995-05-18 Roland Man Druckmasch Vorrichtung zum betrieblichen Erfassen eines Maßes für die Feuchtmittelmenge auf der rotierenden Druckplatte in Offset-Druckmaschinen
DE3479832D1 (en) * 1983-05-17 1989-10-26 Sumitomo Heavy Industries Method of an apparatus for measuring dampening water for printing machine
US4677298A (en) * 1983-12-13 1987-06-30 Kollmorgen Technologies Corporation Method of monitoring ink-water balance on a lithographic printing press
JPS6215063A (ja) * 1985-07-10 1987-01-23 Shin Meiwa Ind Co Ltd 罫書き線追従装置における距離、姿勢制御装置
DE3719766A1 (de) * 1987-06-13 1988-12-22 Heidelberger Druckmasch Ag Registermesssystem
DE3732934A1 (de) * 1987-09-30 1989-04-20 Heidelberger Druckmasch Ag Sensoreinrichtung
DE3830732C2 (de) * 1988-09-09 2000-05-25 Heidelberger Druckmasch Ag Verfahren zur Feuchtmittelführung bei einer Offset-Druckmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH657317A5 (de) * 1981-09-16 1986-08-29 Roland Man Druckmasch Verfahren und vorrichtung zur herstellung passgenauer drucke in druckmaschinen.
DE3444892A1 (de) * 1984-12-08 1986-06-12 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Feuchtmittelvorrichtung fuer das feuchtwerk einer druckmaschine
DE3909401A1 (de) * 1989-03-22 1990-09-27 Heidelberger Druckmasch Ag Verfahren zur festlegung eines messortes fuer die feuchtmittel-schichtdickenbestimmung einer offset-druckplatte

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1818176A3 (fr) * 2006-02-13 2010-12-01 National University Corporation Kyoto Institute of Technology Dispositif de mesure de quantité de d'eau de mouillage et procédé de réglage de d'eau de mouillage

Also Published As

Publication number Publication date
DE4106082A1 (de) 1991-10-31
US5162865A (en) 1992-11-10
JPH04229271A (ja) 1992-08-18
CA2039654A1 (fr) 1991-10-27

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