EP0264562A2 - 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 PDFInfo
- Publication number
- EP0264562A2 EP0264562A2 EP87111628A EP87111628A EP0264562A2 EP 0264562 A2 EP0264562 A2 EP 0264562A2 EP 87111628 A EP87111628 A EP 87111628A EP 87111628 A EP87111628 A EP 87111628A EP 0264562 A2 EP0264562 A2 EP 0264562A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- density
- measuring
- measuring head
- values
- field 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.)
- Granted
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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 presses for densitometric detection of a measuring field strip printed on a bridge arch, which can be scanned by means of a density measuring head moved in a guide along a longitudinal of the measuring field strip.
- 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.
- errors in parallelism 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.
- 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 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 at 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.
Landscapes
- 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
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 Dichtemeßkopfes abtastbar ist.The invention relates to a device on printing presses for densitometric detection of a measuring field strip printed on a bridge arch, which can be scanned by means of a density measuring head moved in a guide along a longitudinal 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. In this disclosure, it is also already described 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 benefits that can be achieved.
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. However, errors in parallelism 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.On the basis of 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.
- 1 a measuring table with color density measuring head,
- 2 the supervision of a measuring field strip with a conventional density measuring head,
- 3 shows the top view of a measuring field strip with a measuring head with a plurality of transducers,
- 4 a measuring head,
- Fig. 5 shows a transducer and
- Fig. 6 shows 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
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
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
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
Claims (3)
dadurch gekennzeichnet,
daß am Dichtemeßkopf (2), quer zum Meßfeldstreifen (5) angeordnet, eine Mehrzahl von Dichtemeßwertaufnehmern (7) nebeneinander vorgesehen sind, daß eine Vergleicherschaltung (16) vorgesehen ist, der die in den einzelnen Aufnehmern (7) gemessenen Dichtewerte zugeführbar sind und daß eine Auswerteschaltung (17) vorgesehen ist, durch die ein Signal zur Ansteuerung einer Anzeige (18, 20) und/oder des Antriebsmotors (19) des Dichtemeßkopfes (2) initierbar ist.1.) Device on printing machines for the densitometric detection of a measuring field strip printed on a printing sheet, which can be scanned by means of a density measuring head which is moved along the measuring field strip in a guide,
characterized by
that on the density measuring head (2), arranged transversely to the measuring field strip (5), a plurality of density measuring transducers (7) are provided side by side, that a comparator circuit (16) is provided, to which the density values measured in the individual transducers (7) can be fed and that an evaluation circuit (17) is provided, by means of which a signal for controlling a display (18, 20) and / or the drive motor (19) of the density measuring head (2) can be initiated.
dadurch gekennzeichnet,
daß die höchsten von den Meßwertaufnehmern (7) ermittelten Dichtemeßwerte ausgewählt und gemittelt zur Anzeige gebracht werden.2.) Device according to claim 1,
characterized by
that the highest density measured values determined by the measuring sensors (7) are selected and averaged are displayed.
dadurch gekennzeichnet,
daß die vom höchsten ermittelten Meßwert um einen festgelegten Differenzwerte abweichenden Meßwerte bei der Meßwertauswertung ausgeschieden werden.3.) Device according to claim 1,
characterized by
that the measured values deviating from the highest determined measured value by a fixed difference values are eliminated in the measured value evaluation.
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 true EP0264562A2 (en) | 1988-04-27 |
EP0264562A3 EP0264562A3 (en) | 1988-12-21 |
EP0264562B1 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) |
Families Citing this family (7)
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 |
DE19844500A1 (en) | 1998-09-29 | 2000-03-30 | Roche Diagnostics Gmbh | Process for the photometric evaluation of test elements |
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 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4237616A (en) * | 1978-10-13 | 1980-12-09 | Tobias Philip E | Scanning path alignment arrangement |
Family Cites Families (9)
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 |
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 |
ATE26674T1 (en) * | 1983-01-29 | 1987-05-15 | Roland Man Druckmasch | DEVICE FOR DETERMINING AND EVALUATING COLOR MEASUREMENT FIELDS ON A PRINTING SHEET. |
DE3465930D1 (en) * | 1983-11-04 | 1987-10-15 | Gretag Ag | Method and device for controlling the ink supply in an offset printing machine, and offset printing machine provided with such a device |
DE3483606D1 (en) * | 1983-12-19 | 1990-12-20 | Gretag Ag | METHOD, DEVICE AND COLOR MEASUREMENT STRIP FOR PRINT QUALITY ASSESSMENT. |
-
1986
- 1986-09-13 DE DE3631204A patent/DE3631204C2/en not_active Expired - Fee Related
-
1987
- 1987-08-11 AT AT87111628T patent/ATE63858T1/en not_active IP Right Cessation
- 1987-08-11 DE DE8787111628T patent/DE3770403D1/en not_active Expired - Lifetime
- 1987-08-11 EP EP87111628A patent/EP0264562B1/en not_active Expired - Lifetime
- 1987-09-11 JP JP62226757A patent/JPH0627704B2/en not_active Expired - Lifetime
- 1987-09-14 US US07/096,859 patent/US4806002A/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4237616A (en) * | 1978-10-13 | 1980-12-09 | Tobias Philip E | Scanning path alignment arrangement |
Also Published As
Publication number | Publication date |
---|---|
DE3631204A1 (en) | 1988-03-24 |
EP0264562A3 (en) | 1988-12-21 |
DE3631204C2 (en) | 1993-11-25 |
DE3770403D1 (en) | 1991-07-04 |
JPH0627704B2 (en) | 1994-04-13 |
JPS6371638A (en) | 1988-04-01 |
EP0264562B1 (en) | 1991-05-29 |
US4806002A (en) | 1989-02-21 |
ATE63858T1 (en) | 1991-06-15 |
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