EP0264562B1 - Device for detecting by densitometry a measuring strip in printing machines - Google Patents

Device for detecting by densitometry a measuring strip in printing machines Download PDF

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Publication number
EP0264562B1
EP0264562B1 EP87111628A EP87111628A EP0264562B1 EP 0264562 B1 EP0264562 B1 EP 0264562B1 EP 87111628 A EP87111628 A EP 87111628A EP 87111628 A EP87111628 A EP 87111628A EP 0264562 B1 EP0264562 B1 EP 0264562B1
Authority
EP
European Patent Office
Prior art keywords
measuring
density
receivers
measured
strip
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.)
Expired - Lifetime
Application number
EP87111628A
Other languages
German (de)
French (fr)
Other versions
EP0264562A3 (en
EP0264562A2 (en
Inventor
Claus Dipl.-Ing. Simeth
Peter Dipl.-Ing. Schramm
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.)
Manroland AG
Original Assignee
MAN Roland 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 MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Priority to AT87111628T priority Critical patent/ATE63858T1/en
Publication of EP0264562A2 publication Critical patent/EP0264562A2/en
Publication of EP0264562A3 publication Critical patent/EP0264562A3/en
Application granted granted Critical
Publication of EP0264562B1 publication Critical patent/EP0264562B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control

Definitions

  • the invention relates to a device on printing machines for the densitometric detection of a measuring field strip printed on a bridge arch, which can be scanned by means of a multiple reading head moved in a guide along a length of the measuring field strip.
  • EP-OS 149 424 Devices of this type are known from EP-OS 149 424. This disclosure also describes how to print an information code alongside the measuring field strip in order to find the suitable measuring position precisely. In addition to the effort, there is the disadvantage that even more space is required on the printed sheet, which further reduces the achievable benefits.
  • the object of the invention is to carry out a densitometric detection of a measuring field strip even when the measuring field strip and the density measuring head travel direction are not exactly parallel.
  • the color measuring system consists of a measuring table 1, on which a density measuring head 2 travels along a suction bar 3.
  • the suction bar 3 holds the sheet 4 placed on the measuring table 1 with the measuring field strip 5 printed thereon in its position.
  • the printed sheet 4 is placed on the table 1 so that the measuring spot 6 (FIG. 2) acted upon by the density measuring head 2 lies exactly on the measuring field strip 5 during traversing.
  • the density measuring head 2 contains eight transducers 7. These are arranged next to one another transversely to the measuring field strip 5, accordingly eight measuring spots 8 to 15 extend transversely. According to the assignment in FIG. 3, the measuring spot 8, 9 have minimal density values on, as well as at the measurement spot 14, 15, whereas the measurement spots 11, 12 and 13 will generate maximum density values and a density value between the measurement spot 10 will be measured.
  • two maximum values are selected by comparing in a comparator circuit 16 and added up in an evaluation circuit 17 and output to a display 18.
  • a signal for stopping the drive 19 of the density measuring head 2 or for indicating 20 an incorrect measurement can also be output. The latter occurs when a high density value is already determined on an edge measurement spot 8, 15.
  • FIG. 4 shows transducers 7 arranged next to one another in a density measuring head 2 with corresponding light sources 24.
  • Each transducer 7 has, according to FIG. 5, diaphragms 21, a photo element 22 and an electronic circuit 23.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

A densitometric sensing device in which a density measuring head, which is part of the device, traverses an ink test strip printed on a page which is fed to or placed on the device. The problem of misalignment between the thus-placed ink test strip and the scanning direction of the density measuring head is avoided by providing a plurality of density measuring receivers in the measuring head, mounted transverse to the direction of travel so that the ink test strip is always under some of the receivers. The measured density values of all of the receivers are passed to a comparison circuit which cooperates with a logic circuit to determine from the values of the signals themselves which should be used to produce a composite density value, which is then used as the density for the zone being scanned.

Description

Die Erfindung betrifft eine Vorrichtung an Druckmaschinen zur densitometrischen Erfassung eines auf einem Bruckbogen aufgedruckten Meßfeldstreifens, der mittels eines Längs des Meßfeldstreifens in einer Führung bewegten Mehrfachlesekopfes abtastbar ist.The invention relates to a device on printing machines for the densitometric detection of a measuring field strip printed on a bridge arch, which can be scanned by means of a multiple reading head moved in a guide along a length of the measuring field strip.

Vorrichtungen dieser Gattung sind durch die EP-OS 149 424 bekannt. In dieser Offenlegung wird auch bereits beschrieben, zum präzisen Auffindern der geeigneten Meßposition neben dem Meßfeldstreifen einen Informationscode mitzudrucken. Neben dem Aufwand besteht der Nachteil, daß auf dem bedruckten Bogen noch mehr Platz benötigt wird, was den erzielbaren Nutzen weiter verringert.Devices of this type are known from EP-OS 149 424. This disclosure also describes how to print an information code alongside the measuring field strip in order to find the suitable measuring position precisely. In addition to the effort, there is the disadvantage that even more space is required on the printed sheet, which further reduces the achievable benefits.

Es ist auch bei den bekannten Vorrichtungen nachteilig, daß die Druckbogen mit aufgedruckten Meßfeldstreifen auf dem Meßtisch genau ausgerichtet aufgelegt werden müssen, da sonst, wenn Streifen und Dichtemeßkopfführung nicht exakt parallel verlaufen, Gefahr besteht, daß der Meßkopf aus dem Bereich der Meßfelder herausfährt. Fehler in der Parallelität können aber auch bereits beim Kopieren auftreten, wenn der Meßfeldstreifen nicht genügend gerade montiert wurde. Auch bereits ein Verziehen des vom Druckprozeß beanspruchten Druckbogens kann Störungen bringen, ebenso wie unkorrektes Anlegen des Druckbogens auf den Meßtisch.It is also disadvantageous in the known devices that the printed sheets with printed measuring field strips must be placed on the measuring table in a precisely aligned manner, since otherwise if the strips and the density measuring head guide do not run exactly parallel there is a risk that the measuring head will move out of the area of the measuring fields. Parallelism errors can also occur during copying if the measuring field strip has not been mounted sufficiently straight. Even a warping of the printing sheet used by the printing process can bring malfunctions, as can incorrect application of the printing sheet on the measuring table.

Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine densitometrische Erfassung eines Meßfeldstreifens auch bei nicht exakt paralleler Lage von Meßfeldstreifen und Dichtemeßkopfverfahrrichtung durchzuführen.Proceeding from this prior art, the object of the invention is to carry out a densitometric detection of a measuring field strip even when the measuring field strip and the density measuring head travel direction are not exactly parallel.

Die Aufgabe wird durch Anwendung der im Kennzeichen des ersten Anspruch aufgeführten Merkmale erzielt.The object is achieved by applying the features listed in the characterizing part of the first claim.

Damit wird eine erhebliche Zeitersparnis beim Ausmessen des Meßfeldstreifens aber auch bereits beim Kopien des Meßfeldstreifens erzielt, da größere Toleranzen zugelassen werden können. Auch wird die Gefahr von Fehlmessungen reduziert.This saves a considerable amount of time when measuring the measuring field strip but also when copying the measuring field strip, since larger tolerances can be permitted. The risk of incorrect measurements is also reduced.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand schematischer Zeichnung noch näher erläutert und zwar zeigt:

Fig. 1
einen Meßtisch mit Farbdichtemeßkopf,
Fig. 2
die Aufsicht auf einen Meßfeldstreifen mit herkömmlichem Dichtemeßkopf,
Fig. 3
die Aufsicht auf einen Meßfeldstreifen mit Meßkopf mit mehreren Meßwertaufnehmern,
Fig. 4
einen Meßkopf,
Fig. 5
einen Meßwertaufnehmer und
Fig. 6
eine Schaltungsanordnung.
An exemplary embodiment of the invention is explained in more detail below with the aid of a schematic drawing and shows:
Fig. 1
a measuring table with color density measuring head,
Fig. 2
the supervision of a measuring field strip with a conventional density measuring head,
Fig. 3
the supervision of a measuring field strip with a measuring head with several sensors,
Fig. 4
a measuring head,
Fig. 5
a sensor and
Fig. 6
a circuit arrangement.

Das Farbmeßsystem besteht aus einem Meßtisch 1, auf dem ein Dichtemeßkopf 2 längs einer Saugleiste 3 travesiert. Die Saugleiste 3 hält den auf dem Meßtisch 1 aufgelegten Bogen 4 mit draufgedrucktem Meßfeldstreifen 5 in seiner Position. Der Druckbogen 4 ist auf dem Tisch 1 so aufgelegt, daß der vom Dichtemeßkopf 2 beaufschlagte Meßfleck 6 (Fig. 2) beim Traversieren exakt auf dem Meßfeldstreifen 5 liegt.The color measuring system consists of a measuring table 1, on which a density measuring head 2 travels along a suction bar 3. The suction bar 3 holds the sheet 4 placed on the measuring table 1 with the measuring field strip 5 printed thereon in its position. The printed sheet 4 is placed on the table 1 so that the measuring spot 6 (FIG. 2) acted upon by the density measuring head 2 lies exactly on the measuring field strip 5 during traversing.

Bei der erfindungsgemäßen Ausführung nach Fig. 3 beinhaltet der Dichtemeßkopf 2 acht Meßwertaufnehmer 7. Diese sind nebeneinander quer zum Meßfeldstreifen 5 angeordnet, dementsprechend quer erstrecken sich acht Meßflecken 8 bis 15. Gemäß der Zuordnung in Fig. 3 liegen am Meßfleck 8, 9 minimale Dichtewerte an, ebenso wie am Meßfleck 14, 15, wohingegen die Meßflecke 11, 12 und 13 maximale Dichtewerte - geerzeugen und am Meßfleck 10 ein Dichtewert dazwischen messen werden wird.In the embodiment according to the invention according to FIG. 3, the density measuring head 2 contains eight transducers 7. These are arranged next to one another transversely to the measuring field strip 5, accordingly eight measuring spots 8 to 15 extend transversely. According to the assignment in FIG. 3, the measuring spot 8, 9 have minimal density values on, as well as at the measurement spot 14, 15, whereas the measurement spots 11, 12 and 13 will generate maximum density values and a density value between the measurement spot 10 will be measured.

Gemäß Fig. 6 werden durch Vergleiche in einer Verleicherschaltung 16 zwei maximale Werte ausgesucht in einer Auswerteschaltung 17 aufsummiert und an eine Anzeige 18 abgegeben worden. Anstelle einer Meßwertanzeige kann auch ein Signal zum Stoppen des Antriebs 19 des Dichtemeßkopfes 2 oder zur Anzeige 20 einer Fehlmessung ausgegeben werden. Letzteres erfolgt dann, wenn an einem Randmeßfleck 8, 15 bereit ein hoher Dichtewert ermittelt wird.According to FIG. 6, two maximum values are selected by comparing in a comparator circuit 16 and added up in an evaluation circuit 17 and output to a display 18. Instead of a measured value display, a signal for stopping the drive 19 of the density measuring head 2 or for indicating 20 an incorrect measurement can also be output. The latter occurs when a high density value is already determined on an edge measurement spot 8, 15.

Fig. 4 zeigt nebeneinander angeordnete Meßwertaufnehmer 7 in einem Dichtemeßkopf 2 mit entsprechenden Lichtquellen 24. Jeder Meßwertaufnehmer 7 weist entsprechend Fig. 5 Blenden 21, ein Fotoelement 22 und eine Elektronikschaltung 23 auf.FIG. 4 shows transducers 7 arranged next to one another in a density measuring head 2 with corresponding light sources 24. Each transducer 7 has, according to FIG. 5, diaphragms 21, a photo element 22 and an electronic circuit 23.

Claims (3)

  1. Device on printing presses for densitometric sensing of a measuring field strip printed on a printed sheet, which can be sensed by means of a multiple read head (2) moved in a guide along the measuring strip (5), characterised in that on the multiple reading head (2), arranged transverse to the measuring strip (5), there are provided a plurality of density measurement receivers (7) adjacent one another, that a comparison circuit (16) is provided to which density values measured in the individual receivers (7) can be fed, whereby in a subsequently arranged evaluation circuit (17) the highest density values representing the position of the multiple reading head (2) relative to the measuring strip (5) are determinable and a signal for the control of an indicator (18, 20) and/or of the drive motor (19) of the multiple reading head (2) can be initiated.
  2. Device according to Claim 1, characterised in that the highest measured density values determined by the measured value receivers (7) are chosen and brought to display as an average.
  3. Device according to Claim 1, characterised in that the measured values departing from the highest determined measured value by a fixed difference value are eliminated in the measured value evaluation.
EP87111628A 1986-09-13 1987-08-11 Device for detecting by densitometry a measuring strip in printing machines Expired - Lifetime EP0264562B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87111628T ATE63858T1 (en) 1986-09-13 1987-08-11 DEVICE ON PRINTING MACHINES FOR DENSITOMETRIC DETECTION OF A MEASURING STRIP.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3631204A DE3631204C2 (en) 1986-09-13 1986-09-13 Device on printing press for densitometric detection of a measuring field strip
DE3631204 1986-09-13

Publications (3)

Publication Number Publication Date
EP0264562A2 EP0264562A2 (en) 1988-04-27
EP0264562A3 EP0264562A3 (en) 1988-12-21
EP0264562B1 true EP0264562B1 (en) 1991-05-29

Family

ID=6309523

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87111628A Expired - Lifetime EP0264562B1 (en) 1986-09-13 1987-08-11 Device for detecting by densitometry a measuring strip in printing machines

Country Status (5)

Country Link
US (1) US4806002A (en)
EP (1) EP0264562B1 (en)
JP (1) JPH0627704B2 (en)
AT (1) ATE63858T1 (en)
DE (2) DE3631204C2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6707554B1 (en) 1998-09-29 2004-03-16 Roche Diagnostics Gmbh Method for the photometric analysis of test elements

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3738850A1 (en) * 1987-11-16 1989-05-24 Roland Man Druckmasch METHOD FOR THE AUTOMATIC POSITION DETECTION OF PRINT CONTROL STRIPS FOR AUTOMATICALLY MEASURING COLOR DENSITY MEASUREMENT SYSTEMS
US5078497A (en) * 1989-08-25 1992-01-07 Xerox Corporation Densitometer for a liquid developer material
US5119132A (en) * 1990-10-24 1992-06-02 Xerox Corporation Densitometer and circuitry with improved measuring capabilities of marking particle density on a photoreceptor
DE29721199U1 (en) * 1997-11-29 1998-01-29 Man Roland Druckmaschinen Ag, 63069 Offenbach Measuring system
US6847451B2 (en) * 2002-05-01 2005-01-25 Lifescan, Inc. Apparatuses and methods for analyte concentration determination
US7636163B2 (en) 2007-07-23 2009-12-22 X-Rite, Inc. Color measurement device with error detection

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3567923A (en) * 1968-04-03 1971-03-02 Hurlectron Inc System for monitoring and controlling the color density of ink during printing
US3756725A (en) * 1970-10-12 1973-09-04 Harris Intertype Corp Measurement and control of ink density
JPS498312A (en) * 1972-05-13 1974-01-24
US3995958A (en) * 1975-07-21 1976-12-07 Hallmark Cards, Incorporated Automatic densitometer and method of color control in multi-color printing
US4237616A (en) * 1978-10-13 1980-12-09 Tobias Philip E Scanning path alignment arrangement
DD158758A1 (en) * 1981-05-04 1983-02-02 Eva Luebbe DEVICE FOR DETECTING AND EVALUATING THE ZONAL COLOR DENSITY OF PRINTING MATERIALS
US4512662A (en) * 1981-07-06 1985-04-23 Tobias Philip E Plate scanner for printing plates
EP0114914B1 (en) * 1983-01-29 1987-04-22 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Device for detecting and evaluating colour control strips on a printing sheet
EP0142470B1 (en) * 1983-11-04 1988-01-07 GRETAG Aktiengesellschaft Method and device for judging the printing quality of a printed object, preferably printed by an offset printing machine, and offset printing machine provided with such a device
EP0149424B1 (en) * 1983-12-19 1990-11-14 GRETAG Aktiengesellschaft Method and device for determining the quality of prints, and colour test strip for said determination

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6707554B1 (en) 1998-09-29 2004-03-16 Roche Diagnostics Gmbh Method for the photometric analysis of test elements

Also Published As

Publication number Publication date
EP0264562A3 (en) 1988-12-21
JPS6371638A (en) 1988-04-01
DE3770403D1 (en) 1991-07-04
ATE63858T1 (en) 1991-06-15
EP0264562A2 (en) 1988-04-27
US4806002A (en) 1989-02-21
DE3631204C2 (en) 1993-11-25
JPH0627704B2 (en) 1994-04-13
DE3631204A1 (en) 1988-03-24

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