EP1353241B1 - Method of calibrating or recalibrating a parameter used for determining the travel path of a printing substrate in a copying machine - Google Patents

Method of calibrating or recalibrating a parameter used for determining the travel path of a printing substrate in a copying machine Download PDF

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Publication number
EP1353241B1
EP1353241B1 EP02028443A EP02028443A EP1353241B1 EP 1353241 B1 EP1353241 B1 EP 1353241B1 EP 02028443 A EP02028443 A EP 02028443A EP 02028443 A EP02028443 A EP 02028443A EP 1353241 B1 EP1353241 B1 EP 1353241B1
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EP
European Patent Office
Prior art keywords
conveyor belt
rotary encoder
length
printing
calibrating
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
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EP02028443A
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German (de)
French (fr)
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EP1353241A3 (en
EP1353241A2 (en
Inventor
Frank Pierel
Jan Dirk Dr. Boness
Heiko Hunold
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Eastman Kodak Co
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Eastman Kodak Co
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Publication date
Priority claimed from DE10256303A external-priority patent/DE10256303B4/en
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of EP1353241A2 publication Critical patent/EP1353241A2/en
Publication of EP1353241A3 publication Critical patent/EP1353241A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/02—Feeding articles separated from piles; Feeding articles to machines by belts or chains, e.g. between belts or chains
    • B65H5/021—Feeding articles separated from piles; Feeding articles to machines by belts or chains, e.g. between belts or chains by belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
    • B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6529—Transporting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/10—Size; Dimensions
    • B65H2511/11—Length
    • B65H2511/112—Length of a loop, e.g. a free loop or a loop of dancer rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/20—Location in space
    • B65H2511/21—Angle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/40—Movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2553/00—Sensing or detecting means
    • B65H2553/51—Encoders, e.g. linear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
    • B65H2557/60—Details of processes or procedures
    • B65H2557/61—Details of processes or procedures for calibrating
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00535—Stable handling of copy medium
    • G03G2215/00556—Control of copy medium feeding
    • G03G2215/00569—Calibration, test runs, test prints
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0151—Apparatus for electrophotographic processes for producing multicoloured copies characterised by the technical problem
    • G03G2215/0158—Colour registration

Description

Die Erfindung betrifft ein Verfahren zur Eichung oder Nacheichung eines Umrechnungsfaktors (Web-Encoder-Resolution), mit dem zur Bestimmung einer von einem Bedruckstoff in einer Druckmaschine, insbesondere einer elektrophotografisch arbeitende Druckmaschine, zurückgelegten Wegstrecke Takte eines Drehwinkelgebers (Web-Encoder), welcher den Vortrieb des Transportbandes, vorzugsweise die Drehung eines rotierenden Antriebselementes für das Transportband, signalisiert, in ein Längenmaß umgerechnet werden.The invention relates to a method for calibrating or recalculating a conversion factor (web encoder resolution), with which for determining a distance covered by a printing material in a printing machine, in particular an electrophotographic printing machine, clocks of a rotary encoder (web encoder), which the Propulsion of the conveyor belt, preferably the rotation of a rotating drive element for the conveyor belt, signaled to be converted to a linear measure.

Für einen Druckvorgang, insbesondere mit einer elektrophotografisch arbeitenden Druckmaschine, bei der ein Bebilderungszylinder für jeden Druckvorgang neu bebildert wird, also ohne eine dauerhafte Druckform gedruckt wird (sogenanntes non impact printing), muß für verschiedene Bedürfnisse eine Wegstrecke in Transportrichtung (intrack) eines Bedruckstoffes bestimmt werden. Insbesondere ist eines der Qualitätsmerkmale eines Druckes, wie genau die Länge eines gedruckten Bildes auf dem Bedruckstoff (Ist-Länge), vorzugsweise auf einem Bogen, in Transportrichtung des Bedruckstoffes mit der gewünschten Bildlänge (Soll-Länge) übereinstimmt. Dies kann nach dem eingangs geschilderten Verfahren mit Hilfe der Signale eines Drehwinkelgebers geschehen, indem das Transportband entsprechend einer vorgegebenen Anzahl von Taktsignalabständen fortbewegt wird, wodurch sich die gewünschte Wegstrecke ergibt, wenn zuvor durch Kalibrierung bzw. Eichung ermittelt worden ist, wie groß der Fortbewegungsabschnitt ist, der einem Taktsignalabstand entspricht und wieviele derartiger Fortbewegungsabschnitte demzufolge zur Erzielung der gewünschten Wegstrecke benötigt werden. Es muß also ein Weg-Umrechnungsfaktor (Web encoder resolution) auf der Basis eines Taktsignalabstandes des Drehwinkelgebers (Web encoder) ermittelt werden.For a printing operation, in particular with an electrophotographic printing press, in which a Bebilderungszylinder is reprinted for each printing, that is printed without a permanent printing form (so-called non impact printing), a distance in the transport direction (intrack) of a printing material must be determined for different needs become. In particular, one of the quality features of a print, as exactly the length of a printed image on the substrate (actual length), preferably on a sheet in the transport direction of the substrate with the desired image length (nominal length) matches. This can be done according to the above-described method using the signals of a rotary encoder by the conveyor belt is moved according to a predetermined number of clock signal intervals, resulting in the desired distance, if previously determined by calibration or calibration, how large is the locomotion section which corresponds to a clock signal interval and how many such travel sections are consequently required to achieve the desired route. Thus, a path conversion factor (Web encoder resolution) must be determined on the basis of a clock signal interval of the rotary encoder (Web encoder).

Ein solcher Weg-Umrechnungsfaktor muß, zumindest einmal, für jede Druckmaschine auch gleichen Types individuell mit der hinreichenden Genauigkeit bestimmt werden.Such a path conversion factor must, at least once, be determined individually for each printing press of the same type with sufficient accuracy.

Dies geschieht beispielsweise für die im vorhergehenden erwähnte Bildlänge herkömmlich in der Weise, dass auf einem Bedruckstoff ein Test-Bild gedruckt wird, das eine bekannte Wegstrecke als Bildlänge auf dem Bedruckstoff markiert. Durch das Ausmessen dieser Wegstrecke auf der Basis von Taktsignalabständen des Drehwinkelgebers und einen Vergleich einer entsprechenden Messung eines gedruckten Bildes in einem Druckprodukt wird ein Korrekturfaktor berechnet, mit dem der Weg-Umrechnungsfaktor oder auch Übertragungsfaktor in einer Software der Druckmaschine angepaßt und auf diese Weise kalibriert wird.This is done, for example, for the above-mentioned image length conventionally in such a way that a test image is printed on a substrate, which marks a known distance as the image length on the substrate. By measuring this distance on the basis of clock signal intervals of the rotary encoder and comparing a corresponding measurement of a printed image in a printed product, a correction factor is calculated with which the path conversion factor or transmission factor is adapted in a software of the printing press and calibrated in this way ,

Diese bekannte Vorgehensweise ist jedoch zeitaufwendig.However, this known procedure is time consuming.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren der eingangs genannten Gattung aufzuzeigen, das mit hinreichender Genauigkeit zeitökonomischer und vorzugsweise auch automatisiert durchführbar ist.The invention is therefore based on the object to show a method of the type mentioned, which is time-economical and preferably automated with reasonable accuracy feasible.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die bei der Bewegung über das Maß seiner Längserstreckung eines in seiner Längserstreckung bekannten oder anderweitig gemessenen Abschnittes des Transportbandes anfallende Anzahl Drehwinkelgebertakte ermittelt und zu der bekannten Längserstreckung ins Verhältnis gesetzt werden.According to the invention, this object is achieved by determining the number of rotational angle encoder pulses which occur during the movement over the extent of its longitudinal extension of a section of the conveyor belt known or otherwise measured in its longitudinal extent and related to the known longitudinal extent.

Dabei ist bevorzugt vorgesehen, dass die Anzahl der Drehwinkelgebertakte, die bei einem vollständigen Umlauf des eine geschlossene Schlaufe bildenden Transportbandes anfallen, ermittelt wird und durch die bekannte oder anderweitig gemessene Gesamtlänge des Transportbandes dividiert wird.It is preferably provided that the number of Drehwinkelgebertakte incurred in a complete circulation of a closed loop forming conveyor belt, is determined and divided by the known or otherwise measured total length of the conveyor belt.

Es hat sich gezeigt, dass für das erfindungsgemäße Verfahren die Länge des Transportbandes oder eines Abschnittes davon hinreichend genau ermittelbar ist und auch hinreichend konstant beim Betrieb der Druckmaschine und deren Alterung bleibt. Sollte sich die Gesamtlänge des Transportbandes im Laufe der Zeit ändern, so würde dies bei von Zeit zu Zeit durchgeführter erfindungsgemäßer Kalibrierung automatisch berücksichtigt, da ja durch eine solche neue Kalibrierung festgestellt würde, dass sich nunmehr eine geänderte Anzahl von Taktsignalabständen für einen vollen Umlauf des Transportbandes ergibt und diese zur neuen, relativen Kalibrierung des Fortbewegungsabschnittes mit der früheren Anzahl der Taktsignalabstände für einen Umlauf ins Verhältnis gesetzt werden muß.It has been found that for the method according to the invention, the length of the conveyor belt or a portion thereof can be determined with sufficient accuracy and also remains sufficiently constant during operation of the printing press and its aging. Should the overall length of the conveyor belt change over time, this would automatically be taken into account in the case of calibration performed according to the invention from time to time, since it would be determined by such a new calibration that now a changed number of clock signal intervals is required for one full revolution of the Transportbandes and this must be set for the new, relative calibration of the travel section with the previous number of clock signal intervals for a round trip.

Für die Durchführung eines exakt vollständigen Umlaufes des Transportbandes bei der Kalibrierung kann vorzugsweise ein signifikantes Merkmal als eine Markierung auf oder an dem Transportband als Start- und Zielmarke angeordnet oder gesucht werden, es kann aber beispielsweise auch mit hinreichender Genauigkeit eine gegebenenfalls zur Ausbildung der geschlossenen Schlaufe des Transportbandes vorhandene Verbindungsnahtstelle der miteinander verbundenen Enden des Transportbandes als eine solche Marke genommen werden, die zum Beispiel, aufgrund geringerer Transparenz des Transportbandes an dieser Nahtstelle, mit einem optischen Sensor erkannt werden könnte.For carrying out an exactly complete rotation of the conveyor belt during the calibration, a significant feature can preferably be arranged or searched as a marking on or on the conveyor belt as a start and destination mark, but it can also be used, for example, with sufficient accuracy to optionally form the closed loop the conveyor belt existing Verbindungsnahtstelle the interconnected ends of the conveyor belt are taken as such a brand that could be recognized, for example, due to less transparency of the conveyor belt at this interface, with an optical sensor.

Eine nur beispielhafte Erläuterung des erfindungsgemäßen Verfahrens, durch die das erfindungsgemäße Verfahren in seinem Umfange nicht beschränkt wird, wird im nachfolgenden anhand der Zeichnung gegeben.An example only explanation of the method according to the invention, by which the inventive method is not limited in scope, is given below with reference to the drawing.

Es zeigen beispielhaft:

Fig. 1
eine Draufsicht auf einen Abschnitt eines Transportbandes mit einem Bogen Bedruckstoff,
Fig. 2
schematisch einen Bereich des Transportbandes gemäß Fig. 1 im Umlauf um eine Antriebswalze und
Fig. 3
eine schematische Seitenansicht des Bereiches eines in geschlossener Schleife umlaufenden Transportbandes einer elektrophotografischen Druckmaschine.
They show by way of example:
Fig. 1
a top view of a section of a conveyor belt with a sheet substrate,
Fig. 2
schematically a region of the conveyor belt according to Fig. 1 in circulation around a drive roller and
Fig. 3
a schematic side view of the area of a closed-loop conveyor belt of an electrophotographic printing machine.

Fig. 1 zeigt in der Draufsicht einen Bogen 1 eines Bedruckstoffes auf einem Transportband 2, von dem nur ein Abschnitt dargestellt ist. Das Transportband 2 transportiert den Bogen 1 in Richtung des Pfeiles 3. Das Transportband bildet eine geschlossene Schlaufe (Fig. 3) und läuft in der Richtung 3 um Umlenkrollen oder -walzen um. Auf den Bogen 1 wird ein Druckbild 4, bspw. ein Text mit einem entsprechenden Satzspiegel oder eine bildliche Darstellung oder eine Mischung von Text und/ oder Grafik und/ oder Logo, mit einer Gesamtlänge L gedruckt. Dazu läuft das Transportband durch eine Druckmaschine, vorzugsweise eine elektrophotografisch arbeitende, nicht näher dargestellte Druckmaschine, und passiert dabei geeignete, ebenfalls in Fig. 1 nicht dargestellte Druckwerke. Dabei ist wichtig, dass die tatsächlich gedruckte Bildlänge L, die in Transportrichtung verläuft, exakt einer Soll-Bildlänge entspricht, deren Druck, beispielsweise nach Maßgabe einer Druckvorlage, gewünscht ist. Dazu muß zum Beispiel bei einer elektrophotografisch arbeitenden Druckmaschine mittels einer geeigneten Software sichergestellt werden, dass zu druckende Bilddaten, die beispielsweise zuvor von der Druckvorlage abgenommen (eingescannt) wurden, zu einer Bebilderung von Bebilderungszylindern zur Entwicklung von Tonerbild-Farbauszügen genutzt werden, deren Bildlänge L, die auf den Bogen 1 des Bedruckstoffes im Druck übertragen werden, der gewünschten Soll-Bildlänge entspricht. Dazu muß die Software einen Maßstab bereitstellen, der auf einer geeigneten Maßeinheit basiert, welche für die jeweilige Druckmaschine kalibriert werden und der Software bereitgestellt oder eventuell auch von Zeit zu Zeit korrigiert werden muß. Fig. 1 shows in plan view a sheet 1 of a printing material on a conveyor belt 2, of which only a portion is shown. The conveyor belt 2 transports the sheet 1 in the direction of arrow 3. The conveyor belt forms a closed loop ( Fig. 3 ) and reverses in direction 3 around pulleys or rollers. On the sheet 1, a printed image 4, for example. A text with a corresponding type area or a visual representation or a mixture of text and / or graphics and / or logo, printed with a total length L. For this purpose, the conveyor belt passes through a printing press, preferably an electrophotographically operating, not shown, printing machine, and passes suitable, also in Fig. 1 not shown printing units. It is important that the actual printed image length L, which runs in the transport direction, exactly corresponds to a desired image length, the pressure of which, for example, according to a print template, is desired. For this purpose, for example, must be ensured in an electrophotographic printing machine by means of suitable software that image data to be printed, for example, previously removed from the print template (scanned) are used for imaging of Bebilderungszylindern for developing toner image color separations whose image length L , which are transferred to the sheet 1 of the printing substrate in print, the desired target image length corresponds. To do so, the software must provide a scale based on a suitable unit of measure which is calibrated for the particular printing press and which must be provided to the software or possibly corrected from time to time.

Fig. 2 zeigt in schematischer Seitenansicht einen Abschnitt des Transportbandes 2, das in Transportrichtung 3 bewegt wird und Bögen 1 in diese Richtung 3 dadurch transportiert. Angetrieben wird das Transportband 2 dabei von einer Antriebswalze 5, die sich in Richtung eines Pfeiles 6 dreht und die von dem Transportband 2 teilweise reibschlüssig umschlungen wird. Das Transportband bildet eine in Fig. 2 nicht näher dargestellte, geschlossene Schlaufe, die über mehrere Umlenkwalzen läuft und die, zur Erzeugung des erwähnten Reibschlusses an der Antriebswalze 5, mit Hilfe der erwähnten Umlenkwalzen gespannt werden kann. Fig. 2 shows a schematic side view of a portion of the conveyor belt 2, which is moved in the transport direction 3 and sheets 1 transported in this direction 3 thereby. The conveyor belt 2 is driven by a drive roller 5, which rotates in the direction of an arrow 6 and which is partially frictionally wrapped by the conveyor belt 2. The conveyor belt forms an in Fig. 2 not shown, closed loop, which runs over a plurality of guide rollers and, for generating said friction against the drive roller 5, with the aid of the aforementioned guide rollers can be clamped.

Im Bereich der Antriebswalze ist ein Drehwinkelgeber 7 oder Encoder angeordnet und in der Fig. 2 nur schematisch angedeutet. Dieser Drehwinkelgeber 7 gibt entsprechend der Drehstellungen der Antriebswalze 5, also drehwinkelbezogen Taktsignale ab. Innerhalb eines zeitlichen Taktsignalabstandes hat sich die Antriebswalze 5 somit um einen bestimmten Drehwinkel weitergedreht und das Transportband 2 ist entsprechend dieses Drehwinkels und des zugeordneten Umfangsabschnittes der Antriebswalze 5 um einen räumlichen Fortbewegungsabschnitt weiterbewegt worden. Dieser Fortbewegungsabschnitt des Transportbandes während jeweils einem Taktsignalabstand des Drehwinkelgebers ist die geeignete Maßeinheit zur Messung einer in Transportrichtung 3 verlaufenden Wegstrecke. Die Maßzahl einer solchen Wegstrecke in dieser genannten Maßeinheit entspricht der Anzahl der Taktsignale, die vom Drehwinkelgeber 7 abgegeben werden, während das Transportband um diese Wegstrecke von der Antriebswalze weiterbewegt wird. Da für die gedruckte Bildlänge L das Maß in Meter bzw. Millimeter interessiert, muß noch eine Eichung bzw. Kalibrierung dahingehend erfolgen, dass die Länge des genannten Fortbewegungsabschnittes in Millimetern gemessen wird. Dies ist herkömmlich so erfolgt, dass die in Millimetern genau bekannte Länge L eines Testbildes auf einen Bogen 1 gedruckt wurde und danach, beispielsweise mittels eines Sensors, der Bildanfang und Bildende erkennt, festgestellt wurde, wieviele Taktsignale des Drehwinkelgebers 7 vergehen, während das Testbild an dem genannten Sensor vorbeibewegt wird. Die Länge L des Testbildes geteilt durch die gemessene Anzahl der Taktsignale ergibt dann die Länge des Fortbewegungsabschnittes in Millimetern.In the field of drive roller a rotary encoder 7 or encoder is arranged and in the Fig. 2 only indicated schematically. This rotary encoder 7 is in accordance with the rotational positions of the drive roller 5, so rotational angle related clock signals. Within a temporal clock signal interval, the drive roller 5 has thus further rotated by a certain angle of rotation and the conveyor belt 2 has been moved in accordance with this angle of rotation and the associated peripheral portion of the drive roller 5 to a spatial locomotion section. This travel portion of the conveyor belt during each clock signal interval of the rotary encoder is the appropriate unit of measurement for measuring a running in the direction of transport 3 distance. The measure of such a distance in this unit of measurement corresponds to the number of clock signals that are emitted by the rotary encoder 7, while the conveyor belt is moved by this distance from the drive roller. Since the dimension in meters or millimeters is of interest for the printed image length L, a calibration must be carried out in such a way that the length of said travel section is measured in millimeters. This is conventionally done so that the accurately known in millimeters length L of a test image was printed on a sheet 1 and thereafter, for example by means of a sensor that recognizes the beginning and end of the image, it was determined how many clock signals of the rotary encoder 7 pass while the test image the said sensor is moved past. The length L of the test image divided by the measured number of clock signals then gives the length of the travel section in millimeters.

Gemäß der Erfindung ist die umständliche Kalibrierung über ein Testbild unnötig.According to the invention, the cumbersome calibration over a test image is unnecessary.

Erfindungsgemäß wird nämlich von der Länge eines Abschnittes oder vorzugsweisedes gesamten, umlaufenden Transportbandes 2 als in Millimetern bekannter Bezugslänge ausgegangen, und diese Gesamtlänge wird in ihrer Anzahl von Taktsignalen bzw. Fortbewegungsabschnitten während eines vollständigen Umlaufes des Transportbandes vermessen, worauf sich durch Quotientenbildung dann wiederum das Maß eines Fortbewegungsabschnittes in Millimetern ergibt bzw. ein geeigneter Umrechnungsfaktor zur Umrechnung von Drehwinkeln in Weglängen gewonnen wird.In fact, according to the invention, the length of a section or preferably of the entire circulating conveyor 2 is assumed to be the reference length known in millimeters, and this total length is measured in terms of the number of clocking or travel sections during one complete revolution of the conveyor, followed by the quotient a movement section in millimeters results or a suitable conversion factor for converting angles of rotation in path lengths is obtained.

Fig. 3 zeigt in einer Seitenansicht schematisch den Bereich einer elektrophotografisch arbeitenden Druckmaschine, in dem ein Transportband 2 für den Transport von Bedruckstoff angeordnet ist und als geschlossene Schleife in Richtung des Pfeils 3 umläuft. Fig. 3 shows in a side view schematically the range of an electrophotographic printing machine in which a conveyor belt 2 is arranged for the transport of printing material and runs as a closed loop in the direction of arrow 3.

Das Transportband 2 läuft über Antriebsrollen 5, die sich in Pfeilrichtung 6 drehen. Im Bereich einer der Antriebsrollen 5 ist ein nicht näher dargestellter Drehwinkelgeber 7 angeordnet.The conveyor belt 2 passes over drive rollers 5, which rotate in the direction of arrow 6. In the area of one of the drive rollers 5, a non-illustrated rotary encoder 7 is arranged.

Die Ankunft eines Bedruckstoffbogens auf dem Transportband 2, zum Beispiel aus einem Anlegerbereich heraus, wird mit einem Sensor 9 erkannt. Registermarken auf dem Bogen oder auf dem Transportband 2 werden mit einem weiteren Sensor 8 erkannt. Zwischen den Sensoren 8, 9 sind oberhalb des Transportbandes 2 vier Druckwerke schematisch und beispielhaft angedeutet, wobei mit den vier Druckwerken Farbauszüge für einen Vierfarbendruck in zum Beispiel Cyan, Magenta, Gelb und Schwarz auf den Bedruckstoff elektrophotografisch aufgebracht werden können. Dazu umfaßt jedes der Druckwerke jeweils einen elektrophotografischen Bebilderungszylinder 10, einen Schreibkopf 11 zur Bebilderung des Bebilderungszylinders 10, eine Tonerstation 12 zur Aufbringung von Toner auf den bebilderten Bebilderungszylinder 10 und zur Entwicklung des dortigen Bildes und einen Gummituchzylinder 13 zur Übertragung des entwickelten Bildes auf den Bedruckstoff.The arrival of a printing material on the conveyor belt 2, for example, from an investor area out, is detected by a sensor 9. Register marks on the sheet or on the conveyor belt 2 are detected by a further sensor 8. Between the sensors 8, 9, four printing units are schematically and exemplarily indicated above the conveyor belt 2, wherein the four printing units color separations for a four-color print in, for example, cyan, magenta, yellow and black can be applied to the substrate by electrophotography. For this purpose, each of the printing units each comprise an electrophotographic Bebilderungszylinder 10, a write head 11 for imaging the Bebilderungszylinders 10, a toner station 12 for applying toner to the imaged Bebilderungszylinder 10 and developing the image there and a blanket cylinder 13 for transferring the developed image on the substrate ,

Claims (3)

  1. Method for calibrating or recalibrating a conversion factor, with which cycles of a rotary encoder (7), which signals the propulsion of a conveyor belt (2), preferably the rotation of a rotating drive element (5) for the conveyor belt (2), are converted into a length measure to define a distance covered by a printing substrate (1) in a printing machine, in particular an electro-photographically operating printing machine,
    characterised in that
    the number of rotary encoder cycles occurring during the movement of a section of the conveyor belt (2) over the measure of the longitudinal extent thereof, the longitudinal extent of which section is known or otherwise measured, is determined and put in proportion with the known longitudinal extent.
  2. Method according to Claim 1, characterised in that the number of rotary encoder cycles which occur during one complete revolution of the conveyor belt (2), which forms a closed loop, is determined and divided by the known or otherwise measured total length of the conveyor belt (2).
  3. Method according to Claim 2, characterised in that a feature present on or attached to the conveyor belt (2) is used as a marker.
EP02028443A 2002-04-08 2002-12-19 Method of calibrating or recalibrating a parameter used for determining the travel path of a printing substrate in a copying machine Expired - Lifetime EP1353241B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10215313 2002-04-08
DE10215313 2002-04-08
DE10256303 2002-12-03
DE10256303A DE10256303B4 (en) 2002-04-08 2002-12-03 Method for determining a conversion factor for determining a distance traveled by a substrate in a printing machine

Publications (3)

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EP1353241A2 EP1353241A2 (en) 2003-10-15
EP1353241A3 EP1353241A3 (en) 2006-03-15
EP1353241B1 true EP1353241B1 (en) 2011-08-24

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EP (1) EP1353241B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7840755B2 (en) * 2005-05-24 2010-11-23 Lsi Corporation Methods and systems for automatically identifying a modification to a storage array
US20100196072A1 (en) 2009-02-03 2010-08-05 Xerox Corporation Modular color xerographic printing architecture
US8526054B2 (en) 2009-04-27 2013-09-03 Xerox Corporation Dynamic image registration apparatus and method
CN104655161B (en) 2013-11-21 2017-05-10 科沃斯机器人股份有限公司 Distance measuring device and method of distance measuring device to find distance measuring initial point
CN114074476B (en) * 2020-08-12 2023-02-21 森大（深圳）技术有限公司 Method, device, equipment and medium for calibrating code disc in Onepass printing system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6219516B1 (en) * 1999-01-19 2001-04-17 Xerox Corporation Systems and methods for reducing image registration errors
JP2001066948A (en) * 1999-08-30 2001-03-16 Canon Inc Image forming device
US6198897B1 (en) * 1999-09-17 2001-03-06 Lexmark International, Inc. Method and apparatus for correcting transfer belt position via stored parameters
DE50112256D1 (en) * 2000-05-17 2007-05-10 Eastman Kodak Co Method for setting the register for cover-like perfecting in a multi-color printing machine

Also Published As

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EP1353241A3 (en) 2006-03-15
US6871037B1 (en) 2005-03-22
EP1353241A2 (en) 2003-10-15

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