EP0576801A1 - Device and method for detecting a sheet - Google Patents

Device and method for detecting a sheet Download PDF

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Publication number
EP0576801A1
EP0576801A1 EP93107251A EP93107251A EP0576801A1 EP 0576801 A1 EP0576801 A1 EP 0576801A1 EP 93107251 A EP93107251 A EP 93107251A EP 93107251 A EP93107251 A EP 93107251A EP 0576801 A1 EP0576801 A1 EP 0576801A1
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EP
European Patent Office
Prior art keywords
sheet
area
paper
front marks
scanning
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
EP93107251A
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German (de)
French (fr)
Other versions
EP0576801B1 (en
Inventor
Heiner Luxem
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen AG
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Publication date
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Publication of EP0576801A1 publication Critical patent/EP0576801A1/en
Application granted granted Critical
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/04—Grippers
    • B41F21/05—In-feed grippers
    • 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
    • B65H2553/00—Sensing or detecting means
    • B65H2553/40—Sensing or detecting means using optical, e.g. photographic, elements
    • B65H2553/41—Photoelectric detectors
    • B65H2553/412—Photoelectric detectors in barrier arrangements, i.e. emitter facing a receptor 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
    • 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 measuring device for sheet detection in the area of the front marks of a paper sheet processing machine, with means for accelerating the sheets aligned along their front edge to a higher speed for transfer to a paper sheet processing unit, and to a method for sheet detection in the area of the front marks of a paper sheet processing machine Machine with means for accelerating the sheets aligned along their front edge to an increased speed required for transfer to the paper sheet processing unit and a pre-gripper device in paper sheet processing machines, in which paper sheets aligned with front marks along their front edge are picked up by pre-grippers and transferred to a paper processing unit by the Pioneers are accelerated.
  • the time available for acceleration is further greatly reduced by the response time of the system, as well as by a sheet installation securing time.
  • the sheet attachment safeguarding time is the period of time that passes before it is ensured that a sheet of paper is present on the front marks for takeover by the pre-grippers.
  • To detect the safe system it is known to place a photoelectric sensor device upstream and downstream of the front mark.
  • the sensor devices are located below the conveyor level and cover a wide area above the sensor position. The sensors can only determine for themselves that any sheet of paper is in a comparatively wide area above the sensor. Thus, the sensor upstream of the front marks can only recognize that part of a sheet of paper is in the area in front of the front mark.
  • the upstream sensor cannot determine whether it is a sheet of paper lying against the front marks or a sheet of paper shot beyond the front mark or even the end of a previous sheet of paper in the case of long sheets of paper.
  • Only the second sensor which is located downstream of the front mark, can provide the information if it does not register a sheet within a predetermined time window, whether the sheet registered by the first sensor is in the position of the machine and ready for acceptance by the pre-grippers.
  • the predetermined time window to be granted to the second sensor undesirably limits the sheet length to be processed.
  • Sheets of paper can only be processed with a length that, after leaving the second sensor through the sheet trailing edge of a previous sheet, enables the second sensor over the specified time window and the time until the sensor is covered by the leading edge of the next of the To anticipate non-coverage of bow-sponsored bows.
  • the evaluation of the signals from two sensors also represents a delay to be calculated for the acceleration time.
  • the invention is based on the problem, a measuring device for sheet detection in the area of the front marks of a paper sheet processing machine and a method for sheet detection in the area of the front marks of a paper sheet processing machine and a gripper device in paper sheet processing machines in which paper sheets aligned with front marks along their front edge are picked up by pre-grippers and be accelerated by the forerunners for handover to a paper processing unit in such a way that the time available for accelerating the paper sheets is increased.
  • the pre-gripper device according to the features of claim 10 also enables quick takeover by the pre-gripper.
  • claims 4 and 9 enable a particularly simple, production-technically favorable, easy-to-assemble, low-maintenance and inexpensive design, since with the upper gripper finger of a gripper an already existing moving part intended for the transfer and acceleration of the sheet is used for the kinematics of the moving measuring part can be.
  • the features of claim 5 enable a particularly preferred measuring device, since only one electrically actuated sensor part needs to be fixed stationary once.
  • the stationary part is easy to maintain and can be controlled electrically.
  • the feature of claim 6 represents a further embodiment.
  • Fig. 1 shows schematically the feed table 1 of a sheet-fed offset printing press, via which paper sheets 20 are placed in a known, not shown manner for aligning the leading edge of the sheet on pivotally attached front marks 6 on a shaft, which is not shown in the machine side frames.
  • the sheets 20, which are aligned along their front edge of the sheet on the front marks 6, rest with their front area on the pre-gripper arm 3 which is pivotably mounted in the machine side frames.
  • a gripper finger 4 is pivotally mounted in the swivel arm 3.
  • the eye of a reflection photo sensor 11 is installed in the support surface 9 of the gripper support and detects the gap area to the underside 8 of the gripper finger 4 vertically upwards.
  • the sensor can thus clearly recognize whether there is a paper sheet between the underside of the gripper and the sensor.
  • the pre-gripper finger is driven in such a way that it only extends over such an angular range from the contact surface 9 Can move gripper pad that in the sheet contact position of the front mark and the pre-gripper, the contact surface 7 of the front mark penetrates the entire gap area.
  • the mode of operation is that a sheet of paper introduced to the front mark between the support finger 4 and the gripper support 5 is brought up to the front marks by the conveying means and is aligned there.
  • a linearly increasing curve 12 results for the movement of the leading edge of the curve for this conveying area.
  • the sensor 11 reports the arrival of the sheet after a short sensor reaction time 13.
  • the leading edge of the sheet is accelerated over a period of time t 21 to the point of transfer 15 in FIG. 4 to a transfer cylinder 2 according to FIG. 1.
  • Transfer cylinder 2 is in a known manner in the machine side frames stored and driven.
  • the sheet is transferred from transfer cylinder 2 to the gripper bar in the impression cylinder.
  • the gripper finger 4 is pivoted slightly away from the gripper pad 5.
  • the front mark 6 and then the pre-gripper arm 3 are pivoted into the contact position.
  • the gripper finger 4 is pivoted down onto the adjacent sheet 20 and from the gripper finger 4 and from the gripper support 5 gripped.
  • the pre-gripper arm 13 pivots again below the table top 1 for the sheet transfer to the transfer cylinder 2.
  • Very long sheets of paper lie on the front marks on the gripper support fingers 4 when the next sheet 20 arrives. Since they are outside the distance covered by the sensors, they are not detected by the sensors. As a result, it is possible, as shown in FIG. 4, to already begin to accelerate the front edge of an aligned sheet according to acceleration line 16, although the back edge of the previous sheet according to movement line 17 in FIG. 4 is still in the effective range of the sensor. Since this sensor device only registers paper sheets that are located in the gap area between the gripper fingers in the safe contact area of the front marks 6, overshoots that shoot over the front mark are also not registered.

Abstract

Measuring apparatus for detecting sheets in the region of the front stops (6) of a paper-sheet-processing machine, having means for accelerating the sheets (20), aligned along their front edge on the front stop (6), to a higher speed for transfer to a paper-sheet-processing unit having a scanning region perpendicular to the sheets conveying plane for detecting the parallel sheet planes which intersect the lay surface (7) of the front stops (6). Said scanning region is delimited by two scanning means, of which one forms the lower delimitation of the scanning region during scanning and the other forms the upper delimitation of the scanning region during scanning. <IMAGE>

Description

Die Erfindung betrifft eine Meßeinrichtung zur Bogenerfassung im Bereich der Vordermarken einer papierbogenverarbeitenden Maschine, mit Mitteln zur Beschleunigung der entlang ihrer Vorderkante an den Vordermarken ausgerichteten Bogen auf eine höhere Geschwindigkeit zur übergabe zu einer papierbogenverarbeitenden Einheit, sowie ein Verfahren zur Bogenerfassung im Bereich der Vordermarken einer papierbogenverarbeitenden Maschine mit Mitteln zur Beschleunigung der entlang ihrer Vorderkante ausgerichteten Bogen auf eine zur übergabe an die papierbogenverarbeitende Einheit erforderliche erhöhte Geschwindigkeit und eine Vorgreifervorrichtung in papierbogenverarbeitenden Maschinen, bei der an Vordermarken entlang ihrer Vorderkante ausgerichtete Papierbogen von Vorgreifern aufgenommen und zur übergabe an eine papierverarbeitende Einheit von den Vorgreifern beschleunigt werden.The invention relates to a measuring device for sheet detection in the area of the front marks of a paper sheet processing machine, with means for accelerating the sheets aligned along their front edge to a higher speed for transfer to a paper sheet processing unit, and to a method for sheet detection in the area of the front marks of a paper sheet processing machine Machine with means for accelerating the sheets aligned along their front edge to an increased speed required for transfer to the paper sheet processing unit and a pre-gripper device in paper sheet processing machines, in which paper sheets aligned with front marks along their front edge are picked up by pre-grippers and transferred to a paper processing unit by the Pioneers are accelerated.

Es ist bekannt, Papierbogen in papierbogenverarbeitenden Maschinen nach Ausrichtung entlang ihrer Vorderkante an Vordermarken mittels Vorgreifern die ausgerichteten Bogen aufzunehmen und an Aufnahmeeinrichtungen der in Förderrichtung nachgeordneten papierverarbeitenden Einheit, beispielsweise einer Greiferleiste des Druckzylinders einer Bogenoffsetrotationsdruckmaschine, zu übergeben. Hierbei obliegt es den Vorgreifern die an Vorderkanten ausgerichteten Bogen auf eine der Verarbeitungsgeschwindigkeit der papierverarbeitenden Einheit angepaßte Geschwindigkeit zu beschleunigen. Bei hohen Genauigkeitserfordernissen bezüglich der Anlage in der papierverarbeitenden Einheit ist es wünschenswert, die Beschleunigung der Bögen möglichst gering zu halten. Andererseits ist die Beschleunigung auf sehr hohe Geschwindigkeiten, beispielsweise im schnellen Bogenoffsetrotationsdruck, durch die räumlich beschränkte Beschleunigungsstrecke stark beschränkt.It is known to pick up paper sheets in paper sheet processing machines after alignment along their front edge on front marks by means of pre-grippers and to transfer them to receiving devices of the paper processing unit arranged downstream in the conveying direction, for example a gripper bar of the printing cylinder of a sheet-fed offset printing machine. It is the responsibility of the pre-grippers to accelerate the sheets aligned on the leading edges to a speed which is adapted to the processing speed of the paper-processing unit. In the case of high accuracy requirements regarding the installation in the paper processing unit, it is desirable to keep the acceleration of the sheets as low as possible. On the other hand, the acceleration to very high speeds, for example in fast Sheetfed offset printing, severely limited by the spatially limited acceleration distance.

Die zur Beschleunigung zur Verfügung stehende Zeit ist weiter durch Reaktionszeit des Systems, sowie durch eine Bogenanlagesicherstellungszeit zusätzlich stark verringert. Die Bogenanlagesicherstellungszeit ist dabei die Zeitspanne, die vergeht, bis sicher gestellt ist, daß an den Vordermarken ein Papierbogen zur übernahme durch die Vorgreifer anliegt. Zur Erkennung der sicheren Anlage ist es bekannt, je eine fotoelektrische Sensoreinrichtung der Vordermarke vor- und nachzuordnen. Die Sensoreinrichtungen befinden sich unterhalb der Förderebene und erfassen einen weiten Bereich oberhalb der Sensorposition. Die Sensoren können dabei jeder für sich lediglich feststellen, daß irgend ein Papierbogen in einem vergleichsweise weiten Bereich oberhalb des Sensors sich befindet. Somit kann der den Vordermarken vorgeordnete Sensor lediglich erkennen, daß sich ein Teil eines Papierbogens im Bereich vor der Vordermarke befindet. Der vorgeordnete Sensor kann nicht feststellen, ob es sich um einen an den Vordermarken anliegenden Papierbogen oder um eine über die Vordermarke hinausgeschossenen Papierbogen oder sogar bei langen Papierbogen um das Ende eines vorangegangenen Papierbogen handelt. Erst der zweite, der den Vordermarke nachgeordnete Sensor, kann die Aussage liefern, wenn er innerhalb eines vorgegebenen Zeitfensters keinen Bogen registriert, ob der vom ersten Sensor registrierte Bogen sich in Anlageposition und bereit zur übernahme durch die Vorgreifer befindet. Das dem zweiten Sensor einzuräumende vorgegebene Zeitfenster begrenzt in unerwünschter Weise die zu verarbeitende Bogenlänge. Papierbogen können nur mit einer Länge verarbeitet werden, die nach Verlassen des zweiten Sensors durch die Bogenhinterkante eines vorangegangenen Bogen es dem zweiten Sensor ermöglichen über das vorgegebene Zeitfenster und die Zeitspanne bis zur überdeckung des Sensors durch die Vorderkante des nächsten von den Vorgreifern geförderten Bogens eine Nichtabdeckung zu registrieren.The time available for acceleration is further greatly reduced by the response time of the system, as well as by a sheet installation securing time. The sheet attachment safeguarding time is the period of time that passes before it is ensured that a sheet of paper is present on the front marks for takeover by the pre-grippers. To detect the safe system, it is known to place a photoelectric sensor device upstream and downstream of the front mark. The sensor devices are located below the conveyor level and cover a wide area above the sensor position. The sensors can only determine for themselves that any sheet of paper is in a comparatively wide area above the sensor. Thus, the sensor upstream of the front marks can only recognize that part of a sheet of paper is in the area in front of the front mark. The upstream sensor cannot determine whether it is a sheet of paper lying against the front marks or a sheet of paper shot beyond the front mark or even the end of a previous sheet of paper in the case of long sheets of paper. Only the second sensor, which is located downstream of the front mark, can provide the information if it does not register a sheet within a predetermined time window, whether the sheet registered by the first sensor is in the position of the machine and ready for acceptance by the pre-grippers. The predetermined time window to be granted to the second sensor undesirably limits the sheet length to be processed. Sheets of paper can only be processed with a length that, after leaving the second sensor through the sheet trailing edge of a previous sheet, enables the second sensor over the specified time window and the time until the sensor is covered by the leading edge of the next of the To anticipate non-coverage of bow-sponsored bows.

Auch die Auswertung der Signale zweier Sensoren stellt eine der Beschleunigungszeit abzurechnende Verzögerung dar.The evaluation of the signals from two sensors also represents a delay to be calculated for the acceleration time.

Der Erfindung liegt das Problem zugrunde, eine Meßeinrichtung zur Bogenerfassung im Bereich der Vordermarken einer papierbogenverarbeitenden Maschine und ein Verfahren zur Bogenerfassung im Bereich der Vordermarken einer papierbogenverarbeitenden Maschine sowie eine Vorgreifervorrichtung in papierbogenverarbeitenden Maschinen, bei der an Vordermarken entlang ihrer Vorderkante ausgerichtete Papierbogen von Vorgreifern aufgenommen und zur Übergabe an eine papierverarbeitende Einheit von den Vorgreifern beschleunigt werden, so zu gestalten, daß die zur Beschleunigung der Papierbogen zur Verfügung stehende Zeit vergrößert wird.The invention is based on the problem, a measuring device for sheet detection in the area of the front marks of a paper sheet processing machine and a method for sheet detection in the area of the front marks of a paper sheet processing machine and a gripper device in paper sheet processing machines in which paper sheets aligned with front marks along their front edge are picked up by pre-grippers and be accelerated by the forerunners for handover to a paper processing unit in such a way that the time available for accelerating the paper sheets is increased.

Erfindungsgemäß gelöst wird dies durch die Merkmale der Ansprüche 1, 7 und 10. Die Begrenzung des Meßbereiches auf eine Strecke vertikal zur Bogenförderebene, welche nur Bogenebenen erfaßt, die die Anlegekanten der Vordermarken in deren Anlegeposition schneiden, ist es möglich, lediglich mit einem einzigen Sensor vor der Vordermarke eine sichere Aussage zu treffen, ob ein Papierbogen sich in angelegter Position zur übernahme durch die Mittel zur Beschleunigung befindet. Weder sogenannte überschießer, noch der Bereich der Hinterkante der vorangegangenen Bogen, selbst wenn er in Bogenförderrichtung gesehen in den Bereich oberhalb des Sensors reicht beeinflussen das Meßergebnis. Sowohl die Anlegesicherstellungszeit als auch die Auswertezeit können somit reduziert werden. Die Beschleunigungsphase kann wesentlich früher eingeleitet werden, die Beschleunigung daher geringer ausgelegt werden. Sowohl Anlageverschiebungen durch die Beschleunigung als auch durch hohe Beschleunigungen hervorgerufene Schwingungen und Rückkopplungen mit anderen Maschinenteilen können erheblich reduziert werden.This is solved according to the invention by the features of claims 1, 7 and 10. The limitation of the measuring range to a distance vertical to the sheet conveying plane, which only detects sheet planes that intersect the contact edges of the front marks in their application position, is possible with only a single sensor to make a reliable statement in front of the front mark as to whether a sheet of paper is in the positioned position for takeover by the means for acceleration. Neither so-called overshooters, nor the area of the rear edge of the preceding sheets, even if it extends into the area above the sensor when viewed in the sheet conveying direction, influence the measurement result. Both the creation time and the evaluation time can thus be reduced. The acceleration phase can be initiated much earlier, so the acceleration can be designed to be lower. Both system shifts due to acceleration and high accelerations Vibrations and feedback caused with other machine parts can be significantly reduced.

Die Vorgreifereinrichtung gemäß den Merkmalen von Anspruch 10 ermöglicht darüber hinaus eine schnelle übernahme durch die Vorgreifer.The pre-gripper device according to the features of claim 10 also enables quick takeover by the pre-gripper.

Eine erfindungsgemäße Ausbildung gemäß den Merkmalen der Ansprüche 2, 3 und 8 ermöglicht eine bogenfördertechnisch besonders vorteilhafte Ausführung.An inventive design according to the features of claims 2, 3 and 8 enables a particularly advantageous embodiment in terms of sheet feeding technology.

Die Merkmale der Ansprüche 4 und 9 ermöglichen eine besonders einfache, fertigungstechnisch günstige, montagefreundliche, wartungsarme und kostengünstige Ausführung, da mit dem oberen Greiferfinger eines Vorgreifers ein bereits vorhandenes bewegtes für die übernahme und die Beschleunigung des Bogens vorgesehenes Teil für die Kinematik des bewegten Meßteils eingesetzt werden kann.The features of claims 4 and 9 enable a particularly simple, production-technically favorable, easy-to-assemble, low-maintenance and inexpensive design, since with the upper gripper finger of a gripper an already existing moving part intended for the transfer and acceleration of the sheet is used for the kinematics of the moving measuring part can be.

Die Merkmale von Anspruch 5 ermöglichen eine besonders bevorzugte Meßeinrichtung, da lediglich ein elektrisch anzusteuerndes Sensorteil einmalig stationär befestigt zu werden braucht. Das stationäre Teil ist einfach zu Warten und elektrisch Anzusteuern.The features of claim 5 enable a particularly preferred measuring device, since only one electrically actuated sensor part needs to be fixed stationary once. The stationary part is easy to maintain and can be controlled electrically.

Das Merkmal von Anspruch 6 stellt eine weitere Ausgestaltungsform dar.The feature of claim 6 represents a further embodiment.

Die Erfindung wird im folgenden anhand eines Ausführungsbeispiels am Anleger einer Bogenoffsetrotationsdruckmaschine, das in den Fig. 1 bis 4 dargestellt ist, näher erläutert.The invention is explained in more detail below on the basis of an exemplary embodiment on the feeder of a sheet-fed offset printing press, which is shown in FIGS. 1 to 4.

Darin zeigen:

Fig. 1
schematische Seitenansicht des die Erfindung aufweisenden Anlegebereichs einer Bogenoffsetrotationsdruckmaschine,
Fig. 2
vergrößerte Darstellung der erfindungsgemäßen Anordnung gemäß Fig. 1,
Fig. 3
Draufsicht auf die erfindungsgemäße Vorrichtung gemäß Fig. 2,
Fig. 4
ein qualitatives Wegzeitdiagramm.
In it show:
Fig. 1
schematic side view of the application area of a sheet-fed offset rotary printing machine having the invention,
Fig. 2
1 enlarged view of the arrangement according to the invention,
Fig. 3
Top view of the device according to the invention according to FIG. 2,
Fig. 4
a qualitative path-time diagram.

Fig. 1 zeigt schematisch den Anlegetisch 1 einer Bogenoffsetrotationsdruckmaschine, über den Papierbogen 20 in bekannter, nicht näher dargestellter Weise zur Ausrichtung der Bogenvorderkante an an einer in nicht dargestellten Maschinenseitengestellen gelagerten Welle schwenkbar befestigten Vordermarken 6 angelegt werden. Die entlang ihrer Bogenvorderkante an den Vordermarken 6 ausgerichteten Bogen 20 liegen mit ihrem vorderen Bereich auf der an einem schwenkbar in den Maschinenseitengestellen gelagerten Vorgreiferarm 3 angebrachten Greiferauflage 5 auf. Im Schwenkarm 3 ist schwenkbar ein Greiferfinger 4 gelagert. In die Auflagefläche 9 der Greiferauflage ist das Auge eines Reflexionsfotosensors 11 eingebaut, der senkrecht nach oben den Spaltbereich zur Unterseite 8 des Greiferfingers 4 erfaßt. Aufgrund der unterschiedlichen Reflexionen der Greiferunterseite, bzw. des Papierbogens kann der Sensor somit eindeutig erkennen, ob sich ein Papierbogen zwischen Greiferunterseite und Sensor befindet. Der Vorgreiferfinger ist so angetrieben, daß er sich lediglich über einen solchen Winkelbereich hinweg von der Auflagefläche 9 der Greiferauflage bewegen kann, daß in Bogenanlageposition der Vordermarke und des Vorgreifers die Anlagefläche 7 der Vordermarke den gesamten Spaltbereich durchdringt.Fig. 1 shows schematically the feed table 1 of a sheet-fed offset printing press, via which paper sheets 20 are placed in a known, not shown manner for aligning the leading edge of the sheet on pivotally attached front marks 6 on a shaft, which is not shown in the machine side frames. The sheets 20, which are aligned along their front edge of the sheet on the front marks 6, rest with their front area on the pre-gripper arm 3 which is pivotably mounted in the machine side frames. A gripper finger 4 is pivotally mounted in the swivel arm 3. The eye of a reflection photo sensor 11 is installed in the support surface 9 of the gripper support and detects the gap area to the underside 8 of the gripper finger 4 vertically upwards. Due to the different reflections of the underside of the gripper or the paper sheet, the sensor can thus clearly recognize whether there is a paper sheet between the underside of the gripper and the sensor. The pre-gripper finger is driven in such a way that it only extends over such an angular range from the contact surface 9 Can move gripper pad that in the sheet contact position of the front mark and the pre-gripper, the contact surface 7 of the front mark penetrates the entire gap area.

Die Funktionsweise ist die, daß ein an die Vordermarke zwischen Auflagefinger 4 und Greiferauflage 5 eingeführter Papierbogen von den Fördermitteln an die Vordermarken herangeführt und dort ausgerichtet wird. Wie in dem Wegzeitdiagramm der Fig. 4 dargestellt ergibt sich für diesen Förderbereich ein linear ansteigender Kurvenverlauf 12 für die Bewegung der Bogenvorderkante. Sobald die Bogenvorderkante den Sensor 11 überschreitet und an der Vordermarke anliegt, meldet der Sensor 11 nach kurzer Sensorreaktionszeit 13 die Ankunft des Bogens. Nach einer weiteren Reaktionszeit für die Einleitung und Durchführung der Beschleunigung erfolgt über eine Zeitspanne t 21 das Beschleunigen der Bogenvorderkante bis zum Punkt der übergabe 15 in Fig. 4 an einen übergabezylinder 2 gemäß Fig. 1. Der übergabezylinder 2 ist in bekannter Weise in den Maschinenseitengestellen gelagert und angetrieben. Vom übergabezylinder 2 wird der Bogen an die Greiferleiste im Druckzylinder übergeben. Zur übergabe wird der Greiferfinger 4 etwas von der Greiferauflage 5 weggeschwenkt. Für den nächsten Bogen wird die Vordermarke 6 und dann der Vorgreiferarm 3 in Anlageposition geschwenkt. Sobald der nächste Bogen in den Spaltbereich zwischen Greiferfinger und Greiferauflage 5 eingeführt worden, an der Anlagefläche 7 der Vordermarken 6 ausgerichtet und von dem Sensor 11 erfaßt worden ist, wird der Greiferfinger 4 auf den anliegenden Bogen 20 heruntergeschwenkt und vom Greiferfinger 4 und von der Greiferauflage 5 gegriffen. Der Vorgreiferarm 13 schwenkt nach Abschwenken der Anlagefläche 4 der Vordermarke 6 bis unter die Tischplatte 1 wieder zur Bogenübergabe an den übergabezylinder 2.The mode of operation is that a sheet of paper introduced to the front mark between the support finger 4 and the gripper support 5 is brought up to the front marks by the conveying means and is aligned there. As shown in the path-time diagram of FIG. 4, a linearly increasing curve 12 results for the movement of the leading edge of the curve for this conveying area. As soon as the leading edge of the sheet exceeds the sensor 11 and is in contact with the front mark, the sensor 11 reports the arrival of the sheet after a short sensor reaction time 13. After a further reaction time for the initiation and implementation of the acceleration, the leading edge of the sheet is accelerated over a period of time t 21 to the point of transfer 15 in FIG. 4 to a transfer cylinder 2 according to FIG. 1. Transfer cylinder 2 is in a known manner in the machine side frames stored and driven. The sheet is transferred from transfer cylinder 2 to the gripper bar in the impression cylinder. For transfer, the gripper finger 4 is pivoted slightly away from the gripper pad 5. For the next sheet, the front mark 6 and then the pre-gripper arm 3 are pivoted into the contact position. As soon as the next sheet has been inserted into the gap area between the gripper finger and the gripper support 5, aligned with the contact surface 7 of the front marks 6 and detected by the sensor 11, the gripper finger 4 is pivoted down onto the adjacent sheet 20 and from the gripper finger 4 and from the gripper support 5 gripped. After the contact surface 4 of the front mark 6 has been pivoted down, the pre-gripper arm 13 pivots again below the table top 1 for the sheet transfer to the transfer cylinder 2.

Sehr lange Papierbogen, deren Bogenhinterkante bei Heranschwenken des Vorgreifers 3 in Bogenanlageposition sich noch im Bereich der Bogenvorderkantenausrichtung befinden, liegen bei Ankunft des nächsten Bogens 20 an den Vordermarken auf den Greiferauflagefingern 4 auf. Da sie sich außerhalb der von den Sensoren erfaßten Strecke befinden, werden sie von den Sensoren nicht erfaßt. Dadurch ist es möglich, wie in Fig. 4 dargestellt ist, die Beschleunigung der Bogenvorderkante eines ausgerichteten Bogens gemäß Beschleunigungslinie 16 bereits zu beginnen, obwohl die Bogenhinterkante des vorangegangenen Bogens gemäß der Bewegungslinie 17 in Fig. 4 sich noch im Wirkbereich des Sensors befindet. Da mit dieser Sensoreinrichtung lediglich Papierbogen registriert werden, die sich im Spaltbereich zwischen Greiferfinger im sicheren Anlagebereich der Vordermarken 6 befinden, werden überschießer, die über die Vordermarke hinwegschießen, ebenfalls nicht registriert.Very long sheets of paper, the sheet trailing edge of which is still in the area of the sheet leading edge alignment when the pre-gripper 3 is pivoted in the sheet contact position, lie on the front marks on the gripper support fingers 4 when the next sheet 20 arrives. Since they are outside the distance covered by the sensors, they are not detected by the sensors. As a result, it is possible, as shown in FIG. 4, to already begin to accelerate the front edge of an aligned sheet according to acceleration line 16, although the back edge of the previous sheet according to movement line 17 in FIG. 4 is still in the effective range of the sensor. Since this sensor device only registers paper sheets that are located in the gap area between the gripper fingers in the safe contact area of the front marks 6, overshoots that shoot over the front mark are also not registered.

Zum Beginn der Beschleunigung ist es somit nicht erforderlich, zunächst sicherzustellen, daß sich die Hinterkante des vorangegangenen Bogens gemäß Fig. 4 nicht mehr im Sensorwirkbereich befindet und dann nach einer Sensorreaktionszeit 18 und einer Reaktionszeit 19 für die Einleitung der Beschleunigung die eigentliche Beschleunigung gemäß Beschleunigungskurve 16' in Fig. 4 einzuleiten. Zur eigentlichen Beschleunigung steht demnach nicht mehr nur die Zeit t 21' sondern eine wesentlich größere Beschleunigungszeit t 21 zur Verfügung. Die Beschleunigung kann entsprechend der Steigung der Kurve 16 wesentlich geringer als eine Beschleunigung gemäß der Steigung von Kurve 16' erfolgen.At the beginning of the acceleration, it is therefore not necessary to first ensure that the rear edge of the preceding sheet according to FIG. 4 is no longer in the sensor effective range and then after a sensor reaction time 18 and a reaction time 19 for the initiation of the acceleration, the actual acceleration according to the acceleration curve 16 'to initiate in Fig. 4. Accordingly, not only the time t 21 'is available for the actual acceleration, but also a significantly longer acceleration time t 21. The acceleration corresponding to the slope of curve 16 can take place significantly less than an acceleration according to the slope of curve 16 '.

Es genügt über die Breite des Anlegetischs ein einziges Sensorauge zu einem Greiferfinger vorzusehen. Bevorzugt werden jedoch zu zwei Greiferfingern symmetrisch zur Tischmitte jeweils ein Sensor zugeordnet. Denkbar ist selbstverständlich auch die Zuordnung eines Sensors zu weiteren Greiferfingern.It is sufficient to provide a single sensor eye for a gripper finger across the width of the feed table. However, one sensor is preferably assigned to two gripper fingers symmetrically to the center of the table. Of course, the assignment of a sensor to other gripper fingers is also conceivable.

BEZUGSZEICHENLISTEREFERENCE SIGN LIST

11
TischplatteTable top
22nd
übergabezylindertransfer cylinder
33rd
VorgreiferarmPre-gripper arm
44th
GreiferfingerGripper fingers
55
GreiferauflageGripper pad
66
VordermarkeFront mark
77
AnlageflächeContact surface
88th
Unterseite des GreiferfingersUnderside of the gripper finger
99
AuflageflächeContact surface
1010th
1111
SensoraugeSensor eye
1212th
Bewegung vor BogenanlageMovement in front of the arch system
1313
SensorreaktionszeitSensor response time
1414
Reaktionszeitreaction time
1515
übergabepunkttransfer point
1616
Bewegung nach übernahme der VorgreiferMovement after taking over the pre-grippers
1717th
Bogenhinterkante des vorangegangenen BogensTrailing edge of the previous sheet
1818th
SensorreaktionszeitSensor response time
1919th
Reaktionszeitreaction time
2020th
PapierbogenSheets of paper
2121
VorgreiferForerunner

Claims (10)

Meßeinrichtung zur Bogenerfassung im Bereich der Vordermarken (6) einer papierbogenverarbeitenden Maschine, mit Mitteln zur Beschleunigung der entlang ihrer Vorderkante an den Vordermarken (6) ausgerichteten Bogen (20) auf eine höhere Geschwindigkeit zur übergabe zu einer papierbogenverarbeitenden Einheit - mit einem Abtastbereich vertikal zur Bogenförderebene zum Erfassen der parallelen Bogenebenen, die die Anlegefläche (7) der Vordermarken (6) schneiden, der durch zwei Abtastmittel begrenzt ist, von denen das eine während des Abtastens die untere Begrenzung des Abtastbereichs und das andere während des Abtastens die obere Begrenzung des Abtastbereichs bildet. Measuring device for sheet detection in the area of the front marks (6) of a paper sheet processing machine, with means for accelerating the sheets (20) aligned along their front edge at the front marks (6) to a higher speed for transfer to a paper sheet processing unit - With a scanning area vertical to the sheet conveying plane for detecting the parallel sheet planes that intersect the contact surface (7) of the front marks (6), which is delimited by two scanning means, one of which during the scanning the lower limit of the scanning area and the other during the Scanning forms the upper limit of the scanning range. Meßeinrichtung zur Bogenerfassung im Bereich der Vordermarken (6) einer papierbogenverarbeitenden Maschine gemäß den Merkmalen von Anspruch 1, - bei der das eine Abtastmittel aus einer Ruhelage außerhalb des Bogenförderbereichs in seine Meßposition veränderbar angeordnet ist, - mit Mitteln zur zyklischen Veränderung der Position dieses Abtastmittels im Bogenfördertakt aus der Ruheposition in die Meßposition und umgekehrt aus der Meßposition in die Ruheposition. Measuring device for sheet detection in the area of the front marks (6) of a paper sheet processing machine according to the features of claim 1, in which the one scanning means is arranged to be changeable into its measuring position from a rest position outside the sheet conveying area, - With means for cyclically changing the position of this scanning means in the sheet conveying cycle from the rest position to the measuring position and vice versa from the measuring position to the rest position. Meßeinrichtung zur Bogenerfassung im Bereich der Vordermarken (6) einer papierbogenverarbeitenden Maschine gemäß den Merkmalen von Anspruch 2, - bei der das eine Abtastmittel zyklisch in seiner Position veränderbar aus einem Bereich unterhalb der Tischplatte zur Messung in Gegenförderrichtung in eine Position oberhalb des anliegenden Bogens und unterhalb von in Förderrichtung mit ihrer Vorderkante den Vordermarken (6) nachgeordneten Bögen verschwenkbar ist - und bei der das andere Abtastmittel in der Tischebene gelagert ist. Measuring device for sheet detection in the area of the front marks (6) of a paper sheet processing machine according to the features of claim 2, - In which the one scanning means can be cyclically changed in its position from an area below the table top for measurement in the counter-conveying direction to a position above the adjacent sheet and below in the conveying direction with its front edge Front marks (6) subordinate sheets is pivotable - And in which the other scanning means is stored in the table plane. Meßeinrichtung zur Bogenerfassung im Bereich der Vordermarken einer papierbogenverarbeitenden Maschine gemäß den Merkmalen von Anspruch 3, - bei der das obere Meßteil am oberen Greiferfinger (4) eines Vorgreifers (21) zur Beschleunigung des Bogens (20) befestigt ist. Measuring device for sheet detection in the area of the front marks of a paper sheet processing machine according to the features of claim 3, - In which the upper measuring part is attached to the upper gripper finger (4) of a pre-gripper (21) to accelerate the sheet (20). Meßeinrichtung zur Bogenerfassung im Bereich der Vordermarken einer papierbogenverarbeitenden Maschine gemäß den Merkmalen von einem oder mehreren der Ansprüche 2 bis 4, - bei der das in der Tischebene gelagerte Meßteil ein Fotosensor (11) ist und - bei der das in seiner Position veränderbare Meßteil eine Abdeckplatte ist. Measuring device for sheet detection in the area of the front marks of a paper sheet processing machine according to the features of one or more of claims 2 to 4, - In which the measuring part stored in the table plane is a photo sensor (11) and - In which the variable measuring part is a cover plate. Meßeinrichtung zur Bogenerfassung im Bereich der Vordermarken einer papierbogenverarbeitenden Maschine gemäß den Merkmalen von einem oder mehreren der vorangegangenen Ansprüche, - bei der die beiden Meßteile Teil einer kapazitiven Sensoreinrichtung sind. Measuring device for sheet detection in the area of the front marks of a paper sheet processing machine according to the features of one or more of the preceding claims, - In which the two measuring parts are part of a capacitive sensor device. Verfahren zur Bogenerfassung im Bereich der Vordermarken einer papierbogenverarbeitenden Maschine mit Mitteln zur Beschleunigung der entlang ihrer Vorderkante ausgerichteten Bogen (20) auf eine zur übergabe an die papierbogenverarbeitende Einheit erforderliche erhöhte Geschwindigkeit, - bei dem Sensoren nur eine zur Bogenförderebene parallele Ebenen durchdringende Strecke erfassen, die eine Anlegeposition für Bogen (20) an der Vordermarke (6) aufweisen. Method for sheet detection in the area of the front marks of a paper sheet processing machine with means for accelerating the sheets (20) aligned along their front edge to an increased speed required for transfer to the paper sheet processing unit, - In the case of sensors, only detect a path which penetrates planes parallel to the sheet conveying plane and which have a placement position for sheets (20) on the front mark (6). Verfahren zur Bogenerfassung im Bereich der Vordermarken einer papierbogenverarbeitenden Maschine gemäß den Merkmalen von Anspruch 7, - bei dem zyklisch im Bogenfördertakt die Meßstrecke in Meßposition ein- und ausgeschwenkt wird. Method for sheet detection in the area of the front marks of a paper sheet processing machine according to the features of claim 7, - In which the measuring section is swung in and out cyclically in the sheet conveying cycle. Verfahren zur Bogenerfassung im Bereich der Vordermarken (6) einer papierbogenverarbeitenden Maschine gemäß den Merkmalen der Ansprüche 7 oder 8, - bei dem die Messung zwischen einem zur Bogenaufnahme eingeschwenkten oberen Finger (4) eines Vorgreifers (21) zur Bogenbeschleunigung und zwischen der Tischebene erfolgt. Method for sheet detection in the area of the front marks (6) of a paper sheet processing machine according to the features of claims 7 or 8, - In which the measurement takes place between an upper finger (4) of a pre-gripper (21) swiveled in to take up the sheet to accelerate the sheet and between the table level. Vorgreifervorrichtung in papierbogenverarbeitenden Maschinen, insbesondere Druckmaschinen, bei der an Vordermarken (6) entlang ihrer Vorderkante ausgerichtete Papierbogen (20) von Vorgreifern (21) aufgenommen und zur übergabe an eine papierverarbeitende Einheit von den Vorgreifern (21) beschleunigt werden, - mit einer den Vordermarken (6) in Förderrichtung vorgeordneten Bogenerfassungseinrichtung zum zyklischen Erfassen eines sich vertikal zur Bogenführungsebene erstreckenden Bereichs von an den Vordermarken (6) anliegenden Bogen (20), - wobei die Bogenerfassungseinrichtung sich während des Erfassens innerhalb des sich in Förderrichtung erstreckenden Aufnahmebereichs der Bogenvorderkante durch den Vorgreifer (21) befindet. Pre-gripper device in paper sheet processing machines, in particular printing machines, in which paper sheets (20) aligned with front marks (6) along their front edge are picked up by pre-grippers (21) and accelerated by the pre-grippers (21) for transfer to a paper processing unit, - With a sheet detection device arranged upstream of the front marks (6) in the conveying direction for the cyclical detection of a region of sheets (20) lying against the front marks (6) extending vertically to the sheet guide plane, - The sheet detection device is located during the detection within the receiving region of the sheet leading edge extending in the conveying direction by the pre-gripper (21).
EP93107251A 1992-07-01 1993-05-05 Device and method for detecting a sheet Expired - Lifetime EP0576801B1 (en)

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DE4221578A DE4221578A1 (en) 1992-07-01 1992-07-01 Device and method for sheet detection
DE4221578 1992-07-01

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DE102009008776B4 (en) * 2008-03-17 2021-05-27 Heidelberger Druckmaschinen Ag Device for aligning sheets with stops
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DE4221578A1 (en) 1994-01-05
JPH0664784A (en) 1994-03-08
JP2851515B2 (en) 1999-01-27
US5390908A (en) 1995-02-21
EP0576801B1 (en) 1996-10-02
DE59304023D1 (en) 1996-11-07
ATE143646T1 (en) 1996-10-15

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