EP1241120A2 - Method and device for detecting the presence of an object, in particular leaf or sheet formed objects for printing - Google Patents

Method and device for detecting the presence of an object, in particular leaf or sheet formed objects for printing Download PDF

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Publication number
EP1241120A2
EP1241120A2 EP01128560A EP01128560A EP1241120A2 EP 1241120 A2 EP1241120 A2 EP 1241120A2 EP 01128560 A EP01128560 A EP 01128560A EP 01128560 A EP01128560 A EP 01128560A EP 1241120 A2 EP1241120 A2 EP 1241120A2
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EP
European Patent Office
Prior art keywords
sensor device
measuring
transport
sheet
measuring range
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
Application number
EP01128560A
Other languages
German (de)
French (fr)
Other versions
EP1241120B1 (en
EP1241120A3 (en
Inventor
Ralph Petersen
Heiko Hunold
Patrick Dr. Metzler
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
NexPress Solutions LLC
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Publication date
Application filed by Eastman Kodak Co, NexPress Solutions LLC filed Critical Eastman Kodak Co
Publication of EP1241120A2 publication Critical patent/EP1241120A2/en
Publication of EP1241120A3 publication Critical patent/EP1241120A3/en
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Publication of EP1241120B1 publication Critical patent/EP1241120B1/en
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Classifications

    • 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
    • B65H7/06—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 responsive to presence of faulty articles or incorrect separation or feed
    • B65H7/08—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 responsive to presence of faulty articles or incorrect separation or feed responsive to incorrect front register
    • 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
    • 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
    • B65H2511/22—Distance
    • 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
    • B65H2511/50—Occurence
    • B65H2511/51—Presence
    • 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
    • B65H2511/50—Occurence
    • B65H2511/51—Presence
    • B65H2511/514—Particular portion of element
    • 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
    • B65H2513/42—Route, path
    • 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
    • B65H2553/40—Sensing or detecting means using optical, e.g. photographic, elements
    • B65H2553/41—Photoelectric detectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/13—Parts concerned of the handled material
    • B65H2701/131—Edges
    • B65H2701/1311—Edges leading edge

Definitions

  • the invention relates to a method for recognizing the presence of a Object, preferably a sheet or arch-shaped object, on a Transport route, in particular to prepare and / or control a Processing of the object; preferably for printing on the object in a Printing machine, in particular a digital printing machine, the object on the way to a sensor device, preferably a light barrier, for detection and registration of the front in the transport direction Edge of the object is transported past.
  • the invention relates to a device for recognizing the Presence of an object, preferably a sheet or arch Object, on a transport route, in particular for preparation and / or Control of processing of the object, preferably for printing on the Object in a printing press, in particular a digital printing press, wherein the transport route on a sensor device, preferably one Light barrier, for detection and registration in the direction of transport passes the front edge of the object, preferably to carry out the aforementioned method.
  • a sensor device preferably one Light barrier
  • the imaging process must be prepared for printing on each sheet to be printed, because no permanent printing form is used (non impact printing), so that the print image needs to be recreated for each sheet to be printed, too when the print image does not change from sheet to sheet.
  • This Illustration takes time so that the arrival of a new sheet is in time must be announced so that the time for the imaging is available and from the printing press is scheduled. The announcement of a next sheet is carried out by a sensor device which detects the presence or arrival recognizes an object on the transport route in its measuring range.
  • This object can be the incoming sheet itself, which is recognized by the sensor device as soon as its front edge enters the measuring range of the sensor device, however, the object can also be, for example, a brand or the like, for example runs on a conveyor belt, and from which the sensor device also recognizes the presence as soon as the front edge in the measuring range entry.
  • the sensor device comes primarily from a disposable or Continuous light barrier or a reflection light barrier into consideration.
  • a problem can be that the sensor device prevents entry into should recognize their measuring range as precisely as possible, so that the measuring range of the Sensor device, for example through a narrow slot, as small as possible is set in this way by the extension of the measuring range to choose the measurement inaccuracy that arises as small as possible.
  • Such precise sensor device is also subject to slight interference Apparitions in the measuring range, which appear like an existing object convey. For example, even small, local Damage such as scratches or soiling to the sensor device trigger and thereby cause false triggering or incorrect switching of the Guide imaging device of an electrophotographic printing machine.
  • the invention is therefore based on the object of a method or a method To improve the device of the type mentioned in that despite high precision, the risk of false detections is reduced.
  • this object is achieved in that after the detection the front edge of the object or its entry in the measuring range, at least once it is checked whether the object is still in the measuring range of the sensor device is available.
  • This measure according to the invention can be reliably ensured be that actually an extended object in the measuring range of the Sensor device has occurred and not a local fault location that only the Impression of an object.
  • the verification carried out several times at defined intervals, which can be relatively small, in that the sensor device works clocked. This allows the Entry and exit of the object are detected and recognized that in there is only one extended object in this entire covered area.
  • the clocking can be related to time or distance, one time-frequency clocking by means of a corresponding distance measurement Distances can be assigned and converted into these. Result it different results but different results and Benefits.
  • a timing can be implemented immediately for the sensor device is sufficient if the sensor device itself decides on the Presence of an object. If the timing is route-related made, the timing is only as even as the run of the used transport device. But this has to do with the preparatory Control e.g. an electrophotographic printing machine has the advantage that Transport speed fluctuations no longer affect the measurement result distort.
  • the sensor device is clocked in a distance-related manner or becomes a time clock otherwise related to a distance measurement, one can Distance statement, for example between the position of the sensor device and the Printing nip of the imaging device, in particular be made if, like According to a further development, the position of the measuring range of the sensor device defined on the transport route with respect to a reference point and is set. Also, as is also preferably provided, the length of the Object to be measured.
  • Minimum length of an expected object is specified, which is checked.
  • At Formatted objects do this using the shortest format length ever used should be taken into account by making the specified minimum length as short or to be on the safe side shorter. Any object that is shorter than the minimum length is considered a source of interference.
  • a device according to the invention of the type mentioned at the outset draws yourself in an independent solution to the problem that the sensor device for at least one check of the still existence of the Object is set up in your measuring range after recognition of the object.
  • the device according to the invention is for multiple checking the presence of an object clocked, namely related to time or distance clocked, operable.
  • an object clocked namely related to time or distance clocked
  • the sensor device and a measuring device for measuring a Transport route via a computing unit and / or a signal output unit connected with each other.
  • the position of the measuring range of the sensor device the transport route of the objects is preferred with respect to a reference point defined and fixed.
  • A is preferably used to transport the objects along the transport path transparent conveyor belt selected, on which the objects can be placed and that does not even interfere with an optically operating sensor device, unless it does would be dirty, scratched, or otherwise damaged, for example.
  • Fig. 1 shows schematically in a side view and partly in the manner of a Block diagram of a section of a transport route for printing Sheets of paper by an electrophotographic printing machine with a Sensor device for recognizing a sheet of paper on the transport route.
  • a transparent conveyor belt 1 is indicated in FIG. 1, which runs along of the transport path runs in transport direction 2.
  • a Sheet of paper 3 is indicated on the conveyor belt 1 .
  • the light barrier 4 is connected via a computing and output unit 6 connected to a timer device 7.
  • the light barrier 4 registered, either because it is a through-beam sensor whose light the transparent conveyor belt 1 passes unimpeded, suddenly interrupted is, or because it is reflected as a reflection light barrier from the paper sheet 3 Light registered.
  • the presence of the sheet of paper 3 in the area of the measuring point 5 is clocked with a time clock from the timer device 7 several times checked during its transportation, and after each iteration, which has shown that the paper sheet can still be seen at measuring point 5
  • Counter of the computing and output unit 6 incremented so that the count rate multiplied by the time interval of the clock cycles results in a measurement period.
  • the measuring time corresponds to the transport speed of the Paper sheet 3 in the transport direction 2 of a measuring section 8, which is the leading edge of the paper sheet 3 passes through from the measuring point 5 during the measuring period.
  • This measuring section 8 can have a defined minimum length to ensure that in fact a more extensive sheet of paper 3 has been recognized and that not a disturbance or irritation from localized pollution or there is a scratch on the conveyor belt 1.
  • the measuring section 8 are chosen to be somewhat shorter than the shortest expected sheet length the paper sheet sizes intended for use.
  • the sheet cannot printing machine shown in detail on the arrival of the paper sheet in the printing nip and the printing process, especially the imaging, is prepared and precisely timed to the arrival of the sheet of paper.
  • To the position or distance of the measuring point must be known as precisely as possible his. This position is therefore determined relative to a reference point 9.
  • the measuring section 8 are taken into account, since only after passing through this measuring section 8 the paper sheet 3 is recognized and announced without a doubt, so that this distance until the arrival at the pressure nip is no longer available and must be taken into account as a delay in reporting the sheet of paper 3.
  • FIG. 2 in Fig. 1 corresponding representation is a second embodiment shown a device according to the invention.
  • the same components are with the the same reference numerals as in Fig. 1st
  • the timer device 7 is the Fig. 1 has been replaced by a displacement measuring device 10, so that the timing or repetition of the query by the light barrier 4 immediately in sections can be done.
  • the measuring section 8 is already covered Route to be taken into account when announcing sheet 3.
  • the light barrier 4 can be so precise and sharp be set so that the measuring range or measuring point 5 is only a few micrometers is extended. Faults caused by local foreign bodies or damage to the Conveyor belt and resulting false triggering of the printing press are prevented by the verifications over the measuring section 8.

Landscapes

  • Controlling Sheets Or Webs (AREA)
  • Paper Feeding For Electrophotography (AREA)

Abstract

The method involves transporting the object past a sensor device, preferably a light barrier (4), to detect and register the leading edge of the object in the transport direction. After detecting the leading edge of the object at least one check is made of whether the object is still present in the sensor's measurement range. Independent claims are also included for the following: an arrangement for detecting presence of object, preferably sheet object for printing.

Description

Die Erfindung betrifft ein Verfahren zum Erkennen des Vorhandenseins eines Objektes, vorzugsweise eines blatt- oder bogenförmigen Objektes, auf einem Transportweg, insbesondere zur Vorbereitung und/oder Steuerung einer Bearbeitung des Objektes; bevorzugt für eine Bedruckung des Objektes in einer Druckmaschine, insbesondere einer digitalen Druckmaschine, wobei das Objekt auf dem Transportweg an einer Sensoreinrichtung, vorzugsweise einer Lichtschranke, für eine Erkennung und Registrierung der in Transportrichtung vorderen Kante des Objektes vorbeitransportiert wird.The invention relates to a method for recognizing the presence of a Object, preferably a sheet or arch-shaped object, on a Transport route, in particular to prepare and / or control a Processing of the object; preferably for printing on the object in a Printing machine, in particular a digital printing machine, the object on the way to a sensor device, preferably a light barrier, for detection and registration of the front in the transport direction Edge of the object is transported past.

Des weiteren betrifft die Erfindung eine Vorrichtung zum Erkennen des Vorhandenseins eines Objektes, vorzugsweise eines blatt- oder bogenförmigen Objektes, auf einem Transportweg, insbesondere zur Vorbereitung und/oder Steuerung einer Bearbeitung des Objektes, bevorzugt für eine Bedruckung des Objektes in einer Druckmaschine, insbesondere einer digitalen Druckmaschine, wobei der Transportweg an einer sensoreinrichtung, vorzugsweise einer Lichtschranke, für eine Erkennung und Registrierung der in Transportrichtung vorderen Kante des Objektes vorbeiführt, vorzugsweise zur Durchführung des vorgenannten Verfahrens.Furthermore, the invention relates to a device for recognizing the Presence of an object, preferably a sheet or arch Object, on a transport route, in particular for preparation and / or Control of processing of the object, preferably for printing on the Object in a printing press, in particular a digital printing press, wherein the transport route on a sensor device, preferably one Light barrier, for detection and registration in the direction of transport passes the front edge of the object, preferably to carry out the aforementioned method.

Insbesondere bei dem Betrieb einer digitalen Druckmaschine, besonders beim Betrieb einer elektrofotographischen Druckmaschine, muß der Bebilderungsvorgang für die Bedruckung jedes zu bedruckenden Bogens vorbereitet werden, weil keine permanente Druckform verwendet wird (Non Impact Printing), so daß das Druckbild für jeden zu bedruckenden Bogen neu erstellt werden muß, auch dann, wenn sich das Druckbild von Bogen zu Bogen nicht ändert. Diese Bebilderung benötigt Zeit, so daß die Ankunft eines neuen Bogens rechtzeitig angekündigt werden muß, damit die Zeit für die Bebilderung vorhanden ist und von der Druckmaschine eingeplant wird. Die Ankündigung eines nächsten Bogens erfolgt durch eine Sensoreinrichtung, die das Vorhandensein bzw. das Eintreffen eines Objektes auf dem Transportweg in ihrem Meßbereich erkennt. Dieses Objekt kann der ankommende Bogen selbst sein, der von der Sensoreinrichtung erkannt wird, sobald seine Vorderkante in den Meßbereich der Sensoreinrichtung eintritt, das Objekt kann aber bspw. auch eine Marke oder dergleichen sein, die beispielsweise auf einem Transportband mitläuft, und von der die Sensoreinrichtung ebenfalls das Vorhandensein erkennt, sobald die Vorderkante in den Meßbereich eintritt. Dabei kommt als Sensoreinrichtung in erster Linie eine Einweg- bzw. Durchgangslichtschranke oder eine Reflexionslichtschranke in Betracht.Especially when operating a digital printing machine, especially when Operation of an electrophotographic printing machine, the imaging process must be prepared for printing on each sheet to be printed, because no permanent printing form is used (non impact printing), so that the print image needs to be recreated for each sheet to be printed, too when the print image does not change from sheet to sheet. This Illustration takes time so that the arrival of a new sheet is in time must be announced so that the time for the imaging is available and from the printing press is scheduled. The announcement of a next sheet is carried out by a sensor device which detects the presence or arrival recognizes an object on the transport route in its measuring range. This object can be the incoming sheet itself, which is recognized by the sensor device as soon as its front edge enters the measuring range of the sensor device, however, the object can also be, for example, a brand or the like, for example runs on a conveyor belt, and from which the sensor device also recognizes the presence as soon as the front edge in the measuring range entry. The sensor device comes primarily from a disposable or Continuous light barrier or a reflection light barrier into consideration.

Ein Problem kann aber darin bestehen, daß die Sensoreinrichtung den Eintritt in ihren Meßbereich möglichst genau erkennen soll, so daß der Meßbereich der Sensoreinrichtung, beispielsweise durch einen schmalen Schlitz, möglichst klein eingestellt wird, um auf diese Weise die durch die Ausdehnung des Meßbereiches selbst entstehende Meßungenauigkeit möglichst klein zu wählen. Eine derartige präzise Sensoreinrichtung unterliegt nämlich auch leichter Störeinflüssen durch Erscheinungen im Meßbereich, die den Anschein eines vorhandenen Objektes vermitteln. Zum Beispiel können auch schon wenig ausgedehnte, lokale Beschädigungen, wie Kratzer, oder Verschmutzungen die Sensoreinrichtung auslösen und dadurch zu Fehltriggerungen bzw. Fehlschaltungen der Bebilderungseinrichtung einer elektrofotographischen Druckmaschine führen.However, a problem can be that the sensor device prevents entry into should recognize their measuring range as precisely as possible, so that the measuring range of the Sensor device, for example through a narrow slot, as small as possible is set in this way by the extension of the measuring range to choose the measurement inaccuracy that arises as small as possible. Such precise sensor device is also subject to slight interference Apparitions in the measuring range, which appear like an existing object convey. For example, even small, local Damage such as scratches or soiling to the sensor device trigger and thereby cause false triggering or incorrect switching of the Guide imaging device of an electrophotographic printing machine.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren bzw. eine Vorrichtung der eingangs genannten Gattung dahingehend zu verbessern, daß trotz hoher Präzision die Gefahr von Falscherkennungen vermindert wird.The invention is therefore based on the object of a method or a method To improve the device of the type mentioned in that despite high precision, the risk of false detections is reduced.

Diese Aufgabe wird in Verfahrenshinsicht dadurch gelöst, daß nach der Erkennung der Vorderkante des Objektes bzw. dessen Eintrittes im Meßbereich, wenigstens einmal überprüft wird, ob das Objekt weiterhin im Meßbereich der Sensoreinrichtung vorhanden ist.In terms of the method, this object is achieved in that after the detection the front edge of the object or its entry in the measuring range, at least once it is checked whether the object is still in the measuring range of the sensor device is available.

Durch diese erfindungsgemäße Maßnahme kann zuverlässig sichergestellt werden, daß tatsächlich ein ausgedehnteres Objekt in den Meßbereich der Sensoreinrichtung eingetreten ist und nicht eine lokale Störungsstelle, die nur den Eindruck eines Objektes erweckt.This measure according to the invention can be reliably ensured be that actually an extended object in the measuring range of the Sensor device has occurred and not a local fault location that only the Impression of an object.

Nach einer Weiterbildung des erfindungsgemäßen Verfahrens wird die Überprüfung mehrfach in definierten Abständen, die relativ klein sein können, durchgeführt, indem die Sensoreinrichtung getaktet arbeitet. Dadurch kann präzise der Eintritt und der Austritt des Objektes erfaßt werden und erkannt werden daß in diesem gesamten erfaßten Bereich nur ein ausgedehntes Objekt vorhanden ist.After a further development of the method according to the invention, the verification carried out several times at defined intervals, which can be relatively small, in that the sensor device works clocked. This allows the Entry and exit of the object are detected and recognized that in there is only one extended object in this entire covered area.

Dabei kann erfindungsgemäß die Taktung zeit- oder wegbezogen sein, wobei eine zeitlich frequente Taktung mittels einer anderweitigen Wegmessung entsprechenden Wegstrecken zugeordnet und in diese umgerechnet werden kann. Es ergeben sich bei den unterschiedlichen Taktungen aber unterschiedliche Ergebnisse und Vorteile. Eine Zeittaktung ist für die Sensoreinrichtung unmittelbar umsetzbar und ist ausreichend, wenn die Sensoreinrichtung selbst die Entscheidung über das Vorhandensein eines Objektes treffen soll. Wird die Taktung wegstreckenbezogen vorgenommen, ist die Taktung zeitlich nur so gleichmäßig wie der Lauf der verwendeten Transporteinrichtung. Dies hat aber für die unmittelbar vorbereitende Steuerung z.B. einer elektrofotographischen Druckmaschine den Vorteil, daß Transportgeschwindigkeitsschwankungen das Meßergebnis nicht mehr verfälschen.According to the invention, the clocking can be related to time or distance, one time-frequency clocking by means of a corresponding distance measurement Distances can be assigned and converted into these. Result it different results but different results and Benefits. A timing can be implemented immediately for the sensor device is sufficient if the sensor device itself decides on the Presence of an object. If the timing is route-related made, the timing is only as even as the run of the used transport device. But this has to do with the preparatory Control e.g. an electrophotographic printing machine has the advantage that Transport speed fluctuations no longer affect the measurement result distort.

Wird die Sensoreinrichtung wegstreckenbezogen getaktet oder wird ein Zeittakt anderweitig mit einer Wegstreckenmessung in Beziehung gesetzt, so kann eine Entfernungsaussage, bspw. zwischen der Position der Sensoreinrichtung und dem Druckspalt der Bebilderungseinrichtung, insbesondere gemacht werden, wenn, wie nach einer Weiterbildung vorgesehen, die Position des Meßbereiches der Sensoreinrichtung auf dem Transportweg bezüglich eines Bezugspunktes definiert und festgelegt wird. Auch kann, wie ebenfalls bevorzugt vorgesehen, die Länge des Objektes gemessen werden.If the sensor device is clocked in a distance-related manner or becomes a time clock otherwise related to a distance measurement, one can Distance statement, for example between the position of the sensor device and the Printing nip of the imaging device, in particular be made if, like According to a further development, the position of the measuring range of the sensor device defined on the transport route with respect to a reference point and is set. Also, as is also preferably provided, the length of the Object to be measured.

Für die Überprüfung des Vorhandenseins eines Objektes im Meßbereich der Sensoreinrichtung und zum Ausschluß von Störungen, wird vorzugsweise eine Mindestlänge eines zu erwartenden Objektes vorgegeben, die überprüft wird. Bei formatierten Objekten wird dazu die kürzeste Formatlänge, die jemals Verwendung finden soll, dazu berücksichtigt, indem die vorgegebene Mindestlänge so kurz oder sicherheitshalber kürzer gewählt wird. Jedes Objekt, das kürzer ist als die Mindestlänge, wird als Störquelle angesehen.For checking the presence of an object in the measuring range of the Sensor device and to exclude interference, is preferably a Minimum length of an expected object is specified, which is checked. at Formatted objects do this using the shortest format length ever used should be taken into account by making the specified minimum length as short or to be on the safe side shorter. Any object that is shorter than the minimum length is considered a source of interference.

Eine erfindungsgemäße Vorrichtung der eingangs genannten Gattung, zeichnet sich in selbständiger Lösung der gestellten Aufgabe dadurch aus, daß die Sensoreinrichtung für wenigstens eine Überprüfung des noch Vorhandenseins des Objektes in Ihrem Meßbereich nach einer Erkennung des Objektes eingerichtet ist.A device according to the invention of the type mentioned at the outset draws yourself in an independent solution to the problem that the sensor device for at least one check of the still existence of the Object is set up in your measuring range after recognition of the object.

Bevorzugte Weiterbildungen der erfindungsgemäßen Vorrichtung ergeben sich aus Unteransprüchen. Die sich durch die Merkmale der erfindungsgemäßen Vorrichtung ergebenden Vorteile wurden schon im Zusammenhang mit dem erfindungsgemäßen Verfahren erläutert.Preferred developments of the device according to the invention result from subclaims. Which are characterized by the features of the invention Advantages resulting from the device have already been associated with the method explained.

Insbesondere ist die erfindungsgemäße Vorrichtung für eine mehrfache Überprüfung des Vorhandenseins eines Objektes getaktet, nämlich zeit- oder wegstreckenbezogen getaktet, betreibbar. Für eine Zeit-Weg-Beziehung sind vorzugsweise die Sensoreinrichtung und eine Meßeinrichtung zur Messung einer Transportstrecke über eine Recheneinheit und/oder eine Signalausgabeeinheit miteinander verbunden. Die Position des Meßbereiches der Sensoreinrichtung auf dem Transportweg der Objekte ist bezüglich eines Bezugspunktes vorzugsweise definiert und festgelegt.In particular, the device according to the invention is for multiple checking the presence of an object clocked, namely related to time or distance clocked, operable. For a time-way relationship are preferred the sensor device and a measuring device for measuring a Transport route via a computing unit and / or a signal output unit connected with each other. The position of the measuring range of the sensor device the transport route of the objects is preferred with respect to a reference point defined and fixed.

Zum Transport der Objekte entlang des Transportweges wird vorzugsweise ein transparentes Transportband gewählt, auf welches die Objekte auflegbar sind und das selbst eine optisch arbeitende Sensoreinrichtung nicht stört, es sei denn, es wäre beispielsweise verschmutzt oder verkratzt oder sonstwie beschädigt.A is preferably used to transport the objects along the transport path transparent conveyor belt selected, on which the objects can be placed and that does not even interfere with an optically operating sensor device, unless it does would be dirty, scratched, or otherwise damaged, for example.

Ausführungsbeispiele einer erfindungsgemäßen Vorrichtung, aus denen sich auch weitere erfinderische Merkmale ergeben können, auf welche die Erfindung aber nicht in ihrem Umfang beschränkt ist, sind in der Zeichnung schematisch dargestellt. Es zeigen:

Fig. 1
einen Abschnitt eines Papiertransportweges einer Druckmaschine mit einer nach Art eines Blockschaltbildes dargestellten ersten Ausführungsform einer erfindungsgemäßen Vorrichtung in einer Seitenansicht und
Fig. 2
eine zweite Ausführungsform gemäß Fig. 1 mit einer zusätzlichen Wegmeßeinrichtung.
Embodiments of a device according to the invention, from which further inventive features can also result, but to which the invention is not limited in scope, are shown schematically in the drawing. Show it:
Fig. 1
a section of a paper transport path of a printing press with a first embodiment of a device according to the invention shown in the manner of a block diagram in a side view and
Fig. 2
a second embodiment of FIG. 1 with an additional displacement measuring device.

Fig. 1 zeigt schematisch in einer Seitenansicht und zum Teil nach Art eines Blockschaltbildes einen Abschitt eines Transportweges für zu bedruckende Papierbögen durch eine elektrofotographisch arbeitende Druckmaschine mit einer Sensoreinrichtung zum Erkennen eines Papierbogens auf dem Transportweg.Fig. 1 shows schematically in a side view and partly in the manner of a Block diagram of a section of a transport route for printing Sheets of paper by an electrophotographic printing machine with a Sensor device for recognizing a sheet of paper on the transport route.

In der Fig. 1 ist dazu ein transparentes Transportband 1 angedeutet, das entlang des Transportweges in Transportrichtung 2 läuft. Auf dem Transportband 1 ist ein Papierbogen 3 angedeutet. Oberhalb des Transportbandes 1 befindet sich eine Sensoreinrichtung zum Erkennen eines Papierbogens 3 auf dem Transportband 1, die insbesondere eine Lichtschranke 4 umfaßt, welche den Eintritt bzw. das Vorhandensein eines Papierbogens 3 in ihrem Meßbereich bzw. Meßpunkt 5 registriert. Die Lichtschranke 4 ist über eine Rechen- und Ausgabeeinheit 6 mit einer Zeitgebereinrichtung 7 verbunden.For this purpose, a transparent conveyor belt 1 is indicated in FIG. 1, which runs along of the transport path runs in transport direction 2. On the conveyor belt 1 is a Sheet of paper 3 indicated. There is one above the conveyor belt 1 Sensor device for recognizing a sheet of paper 3 on the conveyor belt 1, which in particular comprises a light barrier 4, which the entrance or the Presence of a sheet of paper 3 in its measuring range or measuring point 5 registered. The light barrier 4 is connected via a computing and output unit 6 connected to a timer device 7.

Sobald in Transportrichtung 2 die Vorderkante des Papierbogens 3 den Meßpunkt 5 der Lichtschranke 4 erreicht und in diesen eintritt, wird dies von der Lichtschranke 4 registriert, entweder weil sie als Durchgangslichtschranke, deren Licht das transparente Transportband 1 ungehindert durchtritt, plötzlich unterbrochen wird, oder weil sie als Reflexionslichtschranke vom Papierbogen 3 reflektiertes Licht registriert. Das Vorhandensein des Papierbogens 3 im Bereich des Meßpunktes 5 wird getaktet mit einem Zeittakt aus der Zeitgebereinrichtung 7 mehrfach während seines Transportes überprüft, und es wird nach jeder Wiederholung, die ergeben hat, daß der Papierbogen noch im Meßpunkt 5 erkennbar ist, ein Zähler der Rechen- und Ausgabeeinheit 6 inkrementiert, so daß die Zählrate multipliziert mit dem Zeitabstand der Zeittakte eine Meßzeitdauer ergibt. Diese Meßzeitdauer entspricht unter Berücksichtigung der Transportgeschwindigkeit des Papierbogens 3 in Transportrichtung 2 einer Meßstrecke 8, die die Vorderkante des Papierbogens 3 ab dem Meßpunkt 5 während der Meßzeitdauer durchläuft. Diese Meßstrecke 8 kann eine definierte Mindestlänge haben, um sicherzustellen, daß tatsächlich ein ausgedehnterer Papierbogen 3 erkannt worden ist und daß nicht etwa eine Störung oder Irritation durch eine lokal begrenzte Verschmutzung oder ein Kratzer des Transportbandes 1 vorliegt. Beispielsweise kann die Meßstrecke 8 etwas kürzer gewählt werden als die kürzeste zu erwartende Papierbogenlänge der zur Verwendung vorgesehenen Papierbogenformate.As soon as the leading edge of the paper sheet 3 reaches the measuring point in the transport direction 2 5 reaches the light barrier 4 and enters it, this is done by the light barrier 4 registered, either because it is a through-beam sensor whose light the transparent conveyor belt 1 passes unimpeded, suddenly interrupted is, or because it is reflected as a reflection light barrier from the paper sheet 3 Light registered. The presence of the sheet of paper 3 in the area of the measuring point 5 is clocked with a time clock from the timer device 7 several times checked during its transportation, and after each iteration, which has shown that the paper sheet can still be seen at measuring point 5 Counter of the computing and output unit 6 incremented so that the count rate multiplied by the time interval of the clock cycles results in a measurement period. This The measuring time corresponds to the transport speed of the Paper sheet 3 in the transport direction 2 of a measuring section 8, which is the leading edge of the paper sheet 3 passes through from the measuring point 5 during the measuring period. This measuring section 8 can have a defined minimum length to ensure that in fact a more extensive sheet of paper 3 has been recognized and that not a disturbance or irritation from localized pollution or there is a scratch on the conveyor belt 1. For example, the measuring section 8 are chosen to be somewhat shorter than the shortest expected sheet length the paper sheet sizes intended for use.

Aufgrund des im Meßpunkt 5 zweifelsfrei erkannten Papierbogens 3 kann die nicht näher dargestellte Druckmaschine auf die Ankunft des Papierbogens im Druckspalt und der Druckprozess, insbesondere die Bebilderung, vorbereitet werden und zeitlich genau auf die Ankunft des Papierbogens abgestimmt werden. Dazu muß die Position bzw. die Entfernung des Meßpunktes möglichst genau bekannt sein. Diese Position wird daher relativ zu einem Bezugspunkt 9 festgelegt. Bei der zeitlichen Vorbereitung und Abstimmung der Druckmaschine muß aber zusätzlich zu der Position bzw. der Entfernung des Meßpunktes 5 vom Druckspalt die Meßstrecke 8 berücksichtigt werden, da ja erst nach dem Durchlaufen dieser Meßstrecke 8 der Papierbogen 3 zweifelsfrei erkannt und angekündigt wird, so daß diese Wegstrecke bis zur Ankunft am Druckspalt nicht mehr zur Verfügung steht und als Verspätung der Meldung des Papierbogens 3 berücksichtigt werden muß.Due to the paper sheet 3 recognized without a doubt at the measuring point 5, the sheet cannot printing machine shown in detail on the arrival of the paper sheet in the printing nip and the printing process, especially the imaging, is prepared and precisely timed to the arrival of the sheet of paper. To the position or distance of the measuring point must be known as precisely as possible his. This position is therefore determined relative to a reference point 9. In the Time preparation and coordination of the printing press must also be done to the position or the distance of the measuring point 5 from the printing nip the measuring section 8 are taken into account, since only after passing through this measuring section 8 the paper sheet 3 is recognized and announced without a doubt, so that this distance until the arrival at the pressure nip is no longer available and must be taken into account as a delay in reporting the sheet of paper 3.

In Fig. 2 ist in Fig. 1 entsprechender Darstellung ein zweites Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung gezeigt. Gleiche Bauelemente sind mit den gleichen Bezugszahlen bezeichnet wie in Fig. 1.In Fig. 2 in Fig. 1 corresponding representation is a second embodiment shown a device according to the invention. The same components are with the the same reference numerals as in Fig. 1st

Im Ausführungsbeispiel gemäß Fig. 2 ist lediglich die Zeitgebereinrichtung 7 der Fig. 1 durch eine Wegmesseinrichtung 10 ersetzt worden, so daß die Taktung bzw. Abfragewiederholung durch die Lichtschranke 4 gleich wegabschnittsweise erfolgen kann. Auch hier ist dann die Meßstrecke 8 als schon zurückgelegte Strecke bei der Ankündigung des Papierbogens 3 zu berücksichtigen.In the exemplary embodiment according to FIG. 2, only the timer device 7 is the Fig. 1 has been replaced by a displacement measuring device 10, so that the timing or repetition of the query by the light barrier 4 immediately in sections can be done. Here too, the measuring section 8 is already covered Route to be taken into account when announcing sheet 3.

In beiden Fällen der Fig. 1 und 2 kann die Lichtschranke 4 so genau und scharf eingestellt sein, daß der Meßbereich bzw. Meßpunkt 5 nur wenige Mikrometer ausgedehnt ist. Störungen durch lokale Fremdkörper oder Beschädigungen des Transportbandes und daraus resultierende Fehltriggerungen der Druckmaschine werden durch die Verifikationen über die Meßstrecke 8 verhindert.In both cases of FIGS. 1 and 2, the light barrier 4 can be so precise and sharp be set so that the measuring range or measuring point 5 is only a few micrometers is extended. Faults caused by local foreign bodies or damage to the Conveyor belt and resulting false triggering of the printing press are prevented by the verifications over the measuring section 8.

Claims (15)

Verfahren zum Erkennen des Vorhandensein eines Objektes, vorzugsweise eines blatt- oder bogenförmigen Objektes, auf einem Transportweg, insbesondere zur Vorbereitung und/oder Steuerung einer Bearbeitung des Objektes, bevorzugt für eine Bedruckung des Objektes in einer Druckmaschine, insbesondere einer digitalen Druckmaschine, wobei das Objekt auf dem Transportweg an einer Sensoreinrichtung, vorzugsweise einer Lichtschranke, für eine Erkennung und Registrierung der in Transportrichtung vorderen Kante des Objektes vorbeitransportiert wird, dadurch gekennzeichnet, daß nach der Erkennung der Vorderkante des Objektes wenigstens einmal überprüft wird, ob das Objekt weiterhin im Meßbereich der Sensoreinrichtung vorhanden ist.Method for recognizing the presence of an object, preferably a sheet or sheet-shaped object, on a transport path, in particular for preparing and / or controlling processing of the object, preferably for printing on the object in a printing press, in particular a digital printing press, the object is transported past a sensor device, preferably a light barrier, for the detection and registration of the front edge of the object in the transport direction, characterized in that after the detection of the front edge of the object it is checked at least once whether the object is still in the measuring range of the sensor device is available. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Überprüfung taktweise, mehrfach durchgeführt wird.Method according to Claim 1, characterized in that the check is carried out several times in cycles. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß ein bestimmter Zeitabschnittstakt vorgegeben wird.Method according to Claim 2, characterized in that a specific time segment cycle is specified. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß eine vom Objekt zurückgelegte Transportstrecke gemessen wird und daß für die Sensoreinrichtung ein bestimmter Wegabschnittstakt vorgegeben wird.Method according to Claim 2, characterized in that a transport route covered by the object is measured and that a certain path segment cycle is specified for the sensor device. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Position des Meßbereiches der Sensoreinrichtung auf dem Transportweg bezüglich eines Bezugspunktes definiert und festgelegt wird.Method according to one of the preceding claims, characterized in that the position of the measuring range of the sensor device on the transport path is defined and fixed with respect to a reference point. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß bei der Überprüfung des Vorhandenseins des Objektes eine Mindestlänge eines Objektes in Transportrichtung Berücksichtigung findet, in der Weise, daß nur bei Vorhandensein des Objektes auch noch nach Zurücklegen der Mindestlänge am Meßbereich der Sensoreinrichtung vorbei, ein erkanntes Objekt als solches anerkannt wird.Method according to one of the preceding claims, characterized in that when checking the presence of the object, a minimum length of an object in the transport direction is taken into account in such a way that only when the object is present, even after the minimum length has been covered, does the measuring range of the sensor device pass recognized object is recognized as such. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß bei Verwendung formatierter Objekte, die Länge des zur eventuellen Verwendung vorgesehenen Kleinstformates als Mindestlänge berücksichtigt wird.Method according to claim 6, characterized in that when using formatted objects, the length of the smallest format intended for possible use is taken into account as the minimum length. Verfahren nach Anspruch 2, 3 oder 4, dadurch gekennzeichnet, daß der Takt, bei Verwendung eines Zeitabschnittaktes unter Berücksichtigung der Transportgeschwindigkeit, für eine Messung der Länge des Objektes verwendet wird.Method according to Claim 2, 3 or 4, characterized in that the clock, when using a time segment clock taking into account the transport speed, is used for measuring the length of the object. Vorrichtung zum Erkennen des Vorhandenseins eines Objektes, vorzugsweise eines blatt- oder bogenförmigen Objektes, auf einem Transportweg, insbesondere zur Vorbereitung und/oder Steuerung einer Bearbeitung des Objektes, bevorzugt für eine Bedruckung des Objektes in einer Druckmaschine, insbesondere einer digitalen Druckmaschine, wobei der Transportweg an einer Sensoreinrichtung, vorzugsweise einer Lichtschranke, für eine Erkennung und Registrierung der in Transportrichtung vorderen Kante des Objektes vorbeiführt, dadurch gekennzeichnet, daß die Sensoreinrichtung (4) für wenigstens eine Überprüfung des noch Vorhandenseins des Objektes (3) in ihrem Meßbereich (5) nach einer ersten Erkennung des Objektes (3) eingerichtet ist.Device for recognizing the presence of an object, preferably a sheet or sheet-shaped object, on a transport path, in particular for preparing and / or controlling processing of the object, preferably for printing on the object in a printing press, in particular a digital printing press, the transport path by a sensor device, preferably a light barrier, for detection and registration of the front edge of the object in the transport direction, characterized in that the sensor device (4) for at least one check of the still existence of the object (3) in its measuring range (5) a first detection of the object (3) is set up. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, daß die Sensoreinrichtung (4) für eine mehrfache Überprüfung getaktet ist.Apparatus according to claim 9, characterized in that the sensor device (4) is clocked for a multiple check. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, daß ein bestimmter Zeitabschnittstakt für die Sensoreinrichtung (4) vorgegeben ist.Apparatus according to claim 10, characterized in that a certain time interval cycle is predetermined for the sensor device (4). Vorrichtung nach Anspruch 10, gekennzeichnet durch eine Meßeinrichtung (10) zur Messung einer vom Objekt (3) zurückgelegten Transportstrecke, die mit der Sensoreinrichtung (4) in Verbindung steht, zur Vorgabe eines bestimmten Wegabschnittstaktes für die Sensoreinrichtung (4).Apparatus according to claim 10, characterized by a measuring device (10) for measuring a transport route covered by the object (3), which is connected to the sensor device (4), for specifying a specific path section cycle for the sensor device (4). Vorrichtung nach Anspruch 12, dadurch gekennzeichnet, daß die Sensoreinrichtung (4) und die Meßeinrichtung (10) zur Messung der Transportstrecke über eine Recheneinheit und/oder eine Signalausgabeeinheit (6) miteinander verbunden sind.Apparatus according to claim 12, characterized in that the sensor device (4) and the measuring device (10) for measuring the transport route are connected to one another via a computing unit and / or a signal output unit (6). Vorrichtung nach einem der Ansprüche 9 bis 13, dadurch gekennzeichnet, daß die Position des Meßbereiches (5) der Sensoreinrichtung (4) auf dem Transportweg bezüglich eines Bezugspunktes (9) definiert und festgelegt ist.Device according to one of claims 9 to 13, characterized in that the position of the measuring range (5) of the sensor device (4) on the transport path is defined and fixed with respect to a reference point (9). Vorrichtung nach einem der Ansprüche 9 bis 14, dadurch gekennzeichnet, daß zum Transport des Objektes (3) entlang des Transportweges ein transparentes Transportband (1) vorgesehen ist, auf welches das Objekt (3) auflegbar ist.Device according to one of claims 9 to 14, characterized in that a transparent conveyor belt (1) is provided for transporting the object (3) along the transport path, on which the object (3) can be placed.
EP01128560A 2001-03-17 2001-11-30 Method and device for detecting the presence of an object, in particular leaf or sheet formed objects for printing Expired - Lifetime EP1241120B1 (en)

Applications Claiming Priority (2)

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DE10112946A DE10112946A1 (en) 2001-03-17 2001-03-17 Method and device for recognizing the presence of an object, preferably a sheet or sheet-shaped object for printing
DE10112946 2001-03-17

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JP3941552B2 (en) * 2002-03-12 2007-07-04 富士ゼロックス株式会社 Paper transport control device
GB2550857B (en) * 2016-05-25 2019-12-04 Linx Printing Tech Limited Printer

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JPS62211247A (en) * 1986-03-11 1987-09-17 Toppan Printing Co Ltd Insufficient folding inspecting device
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JPS62211247A (en) * 1986-03-11 1987-09-17 Toppan Printing Co Ltd Insufficient folding inspecting device
DE3730683A1 (en) * 1987-09-12 1989-03-23 Gremser Masch Franz Process and device for monitoring articles
DE19960653A1 (en) * 1998-12-16 2000-06-21 Baumer Electric Ag Frauenfeld Method to detect edges of moving objects, especially thin sheets, e.g. of paper or transparent film; involves moving edge at angle to light beam in object plane and focusing light in at least one direction, to produce redundancy

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US20020130461A1 (en) 2002-09-19
JP2002274698A (en) 2002-09-25
DE50112661D1 (en) 2007-08-09
EP1241120A3 (en) 2004-02-04
DE10112946A1 (en) 2002-09-26

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