EP0576801B1 - Device and method for detecting a sheet - Google Patents
Device and method for detecting a sheet Download PDFInfo
- Publication number
- EP0576801B1 EP0576801B1 EP93107251A EP93107251A EP0576801B1 EP 0576801 B1 EP0576801 B1 EP 0576801B1 EP 93107251 A EP93107251 A EP 93107251A EP 93107251 A EP93107251 A EP 93107251A EP 0576801 B1 EP0576801 B1 EP 0576801B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet
- scanning
- gripper
- paper
- acceleration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- 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 at the front marks to a higher speed for transfer to a paper sheet processing unit.
- 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 brands for takeover by the pre-grippers. It is known to recognize the safe system, one each Photoelectric sensor device upstream and downstream of the front mark, z. B. by US 3,169,476.
- 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 to remain uncovered over the specified time window and the time until the sensor is covered by the leading edge of the next sheet promoted by the pioneers to register.
- 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 of a measuring device for sheet detection in the area of the front marks of a paper sheet processing machine, in which sheets of paper aligned with front marks along their front edge Be anticipated and accelerated by the forerunners to handover to a paper processing unit, so that the time available to accelerate the paper sheets is increased.
- the pre-gripper device also enables quick take-over by the pre-grippers.
- An embodiment according to the invention enables a particularly simple, production-technically favorable, easy-to-assemble, low-maintenance and inexpensive design, since with the upper gripper finger of a pre-gripper an already existing moving part intended for the transfer and acceleration of the sheet can be used for the kinematics of the moving measuring part.
- 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 pre-gripper arm 3.
- the eye of a reflection photo sensor 11 is installed, which detects the gap area to the underside 8 of the gripper finger 4 vertically upwards, on the z.
- a cover plate can be arranged.
- 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 such that it only extends over such an angular range from the contact surface 9 of the 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 gripper fingers 4 and 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 sheet leading edge 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 the 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.
- the sheet is gripped by the gripper finger 4 and by the gripper pad 5.
- the pre-gripper arm 3 pivots, after the contact surface 7 of the front mark 6 has been pivoted down to below the table top 1, again for the sheet transfer to the transfer cylinder 2.
- Very long sheets of paper lie on the front marks on the gripper 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, even though 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 gripper fingers 4 in the safe contact area of the front marks 6, overshoots that shoot over the front mark are also not registered.
- Scanning and reflection means (11, 8) can be part of a capacitive sensor device.
Landscapes
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
- Controlling Sheets Or Webs (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
Abstract
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 an eine papierbogenverarbeitende Einheit.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 at the front marks to a higher speed for transfer to a paper sheet processing unit.
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 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 sheet-fed offset printing, is severely restricted by the spatially limited acceleration path.
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, z. B. durch die US 3,169,476. 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 brands for takeover by the pre-grippers. It is known to recognize the safe system, one each Photoelectric sensor device upstream and downstream of the front mark, z. B. by US 3,169,476. 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 to remain uncovered over the specified time window and the time until the sensor is covered by the leading edge of the next sheet promoted by the pioneers to register.
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, 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 of a measuring device for sheet detection in the area of the front marks of a paper sheet processing machine, in which sheets of paper aligned with front marks along their front edge Be anticipated and accelerated by the forerunners to handover to a paper processing unit, so that the time available to accelerate the paper sheets is increased.
Erfindungsgemäß gelöst wird dies durch die kennzeichnenden Merkmale des Anspruchs 1. 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 characterizing features of claim 1. Limiting the measuring range to a distance vertical to the sheet conveying plane, which only detects sheet planes that intersect the contact edges of the leading marks in their contact position, is possible only with a single sensor in front of the leading mark to make a reliable statement as to whether a sheet of paper is in the positioned position to be taken over by the means for accelerating. Neither so-called overshooters, nor the area of the trailing 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. System shifts due to acceleration as well as vibrations caused by high accelerations and feedback with other machine parts can be significantly reduced.
Die Vorgreifereinrichtung ermöglicht darüber hinaus eine schnelle Übernahme durch die Vorgreifer.The pre-gripper device also enables quick take-over by the pre-grippers.
Eine erfindungsgemäße Ausgestaltung ermöglicht 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.An embodiment according to the invention enables a particularly simple, production-technically favorable, easy-to-assemble, low-maintenance and inexpensive design, since with the upper gripper finger of a pre-gripper an already existing moving part intended for the transfer and acceleration of the sheet can be used for the kinematics of the moving measuring part.
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.
- 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 Vorgreiferarm 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, an dem z. B. eine Abdeckplatte angeordnet sein kann. 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
Die Funktionsweise ist die, daß ein an die Vordermarke zwischen Greiferfinger 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. Der Bogen wird vom Greiferfinger 4 und von der Greiferauflage 5 gegriffen. Der Vorgreiferarm 3 schwenkt, nach Abschwenken der Anlagefläche 7 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
Sehr lange Papierbogen, deren Bogenhinterkante sich bei Heranschwenken des Vorgreifers 3 in Bogenanlageposition noch im Bereich der Bogenvorderkantenausrichtung befinden, liegen bei Ankunft des nächsten Bogens 20 an den Vordermarken auf den Greiferfingern 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 4 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
Zum Beginn der Beschleunigung ist es somit nicht erforderlich, zunächst sicherzustellen, daß sich die Hinterkante des vorangegangenen Bogens gemäß Fig. 4 nicht mehr im Wirkbereich des Sensors 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 trailing edge of the preceding sheet according to FIG. 4 is no longer in the effective range of the sensor and then after a
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. Abtast- und Reflexionsmittel (11,8) können Teil eienr kapazitiven Sensoreinrichtung sein.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. Scanning and reflection means (11, 8) can be part of a capacitive sensor device.
- 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 predecessors
- 1717th
- Bogenhinterkante des vorangegangenen BogensTrailing edge of the previous sheet
- 1818th
- SensorreaktionszeitSensor response time
- 1919th
- Reaktionszeitreaction time
- 2020th
- PapierbogenSheets of paper
Claims (4)
- Measuring device for sheet detection in the region of the front lays (6) of a paper sheet processing machine, having means for the acceleration (3, 4, 5) of the sheets (20), aligned along their leading edge at the front lays (6), to a higher speed for transfer to a paper sheet processing unit, having a scanning region perpendicular to the sheet-conveying plane for detecting the parallel sheet planes which intersect the feed surface (7) of the front lays (6), the scanning region being bounded by a scanning means (11) and a reflection means (8) interacting with the scanning means (11), of which the scanning means (11) forms one boundary of the scanning region and the reflection means (8) forms the other boundary of the scanning region, at least one of the means (8, 11) bounding the scanning region being arranged on the means for the acceleration (3, 4, 5) of the sheets (20), characterized in that the means for acceleration are designed as a pregripper device, the scanning means (11) being integrated in a gripper pad (5), and the reflection means (8) being formed by an underside of a gripper finger.
- Measuring device according to Claim 1, characterized in that, for measuring, the reflection means (8) which can be changed cyclically in its position can be pivoted from a region below a table top (1) in the counter-conveying direction into a position above the resting sheet.
- Measuring device according to the features of one or more of the claims, characterized in that the scanning means (11) arranged in the gripper pad (5) is a photosensor, and in that the reflection means (8) which can be changed in its position is a covering plate.
- Measuring device according to one or more of the preceding claims, characterized in that the scanning and reflection means (11, 8) are part of a capacitive sensor device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4221578A DE4221578A1 (en) | 1992-07-01 | 1992-07-01 | Device and method for sheet detection |
| DE4221578 | 1992-07-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0576801A1 EP0576801A1 (en) | 1994-01-05 |
| EP0576801B1 true EP0576801B1 (en) | 1996-10-02 |
Family
ID=6462230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93107251A Expired - Lifetime EP0576801B1 (en) | 1992-07-01 | 1993-05-05 | Device and method for detecting a sheet |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5390908A (en) |
| EP (1) | EP0576801B1 (en) |
| JP (1) | JP2851515B2 (en) |
| AT (1) | ATE143646T1 (en) |
| DE (2) | DE4221578A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE167112T1 (en) * | 1994-02-17 | 1998-06-15 | De La Rue Giori Sa | DEVICE FOR TRANSFERRING INDIVIDUAL SHEETS TO THE PRINTING CYLINDER OF A SHEET ROTARY PRINTING MACHINE |
| DE19600793C2 (en) * | 1996-01-11 | 1999-12-02 | Heidelberger Druckmasch Ag | Device for aligning sheets on the feed table of a sheet printing machine |
| DE19653487C1 (en) * | 1996-12-20 | 1998-07-23 | Siemens Nixdorf Inf Syst | Document printing device with document collecting station |
| DE19831976B4 (en) * | 1998-07-16 | 2010-07-29 | Heidelberger Druckmaschinen Ag | Device for feeding sheets to a sheet-processing machine |
| US6203084B1 (en) | 1999-02-04 | 2001-03-20 | Inscerco Mfg., Inc. | Gripper arm assembly |
| DE10254330A1 (en) * | 2001-12-20 | 2003-07-10 | Heidelberger Druckmasch Ag | Sheet aligning device for feeder of sheet processing machine e.g. printing press has wedge-like slide for actuating push rod provided for vertically adjusting top lays |
| DE102009008776B4 (en) * | 2008-03-17 | 2021-05-27 | Heidelberger Druckmaschinen Ag | Device for aligning sheets with stops |
| US8714087B2 (en) * | 2011-09-13 | 2014-05-06 | Hewlett-Packard Indigo B.V. | Image forming apparatuses and methods thereof |
Family Cites Families (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD64977A (en) * | ||||
| US1984588A (en) * | 1932-04-19 | 1934-12-18 | Liebusch Max | Sheet feeding apparatus |
| DE835749C (en) * | 1950-10-27 | 1952-04-03 | Faber & Schleicher A G | Filling device for sheet processing machines, especially printing machines |
| GB740372A (en) * | 1952-12-06 | 1955-11-09 | Druckmaschinenwerk Planeta Vvb | Sheet-registering devices for overlapping stream feeds |
| GB844397A (en) * | 1957-05-23 | 1960-08-10 | Frankfuruter Maschb Ag Vorm Po | Improvements in or relating to sheet-feeding mechanism |
| US2926909A (en) * | 1959-03-17 | 1960-03-01 | Miehle Goss Dexter Inc | Sheet transfer mechanism |
| DE1126411B (en) * | 1961-01-28 | 1962-03-29 | Maschf Augsburg Nuernberg Ag | Sheet feeder |
| US3169476A (en) * | 1962-11-30 | 1965-02-16 | Linotype Machinery Ltd | Photoelectric no sheet trip device for a printing press |
| DE1167853B (en) * | 1962-12-20 | 1964-04-16 | Linotype Machinery Ltd | Control device on sheet processing machines to switch off the machine when missing sheets occur |
| DE1217980B (en) * | 1964-07-29 | 1966-06-02 | Gerhard Ritzerfeld | Rotation multiplier for printing printing forms on sheets, cards or the like. |
| US3647205A (en) * | 1970-05-15 | 1972-03-07 | Polygraph Leipzig | Method and apparatus for feeding of sheets fittingly aligned to a machine |
| DE2144649C3 (en) * | 1971-09-07 | 1974-10-24 | Weitmann & Konrad, 7023 Echterdingen | Reflection measuring head for scanning and detecting reflective objects |
| DD96054A1 (en) * | 1972-04-20 | 1973-03-12 | ||
| GB1392913A (en) * | 1972-05-25 | 1975-05-07 | Svecia Silkscreen Maskiner Ab | Silkscreen printing machine |
| DD131240A1 (en) * | 1976-09-03 | 1978-06-14 | Hartmut Heiber | CAPACITIVE CONTROL AND EVALUATION DEVICE |
| JPS59215Y2 (en) * | 1979-12-20 | 1984-01-06 | 小森印刷機械株式会社 | Improper paper feeding detection device for printing presses |
| DE3111952A1 (en) * | 1981-03-23 | 1982-10-07 | Francotyp Gmbh, 1000 Berlin | METHOD FOR CONTROLLING THE SEPARATION AND DEFECTS IN THE FEEDING OF LEAF-SHAPED GOODS |
| DE3301722C2 (en) * | 1983-01-20 | 1985-03-07 | Heidelberger Druckmaschinen Ag, 6900 Heidelberg | Method and device for the correct feeding of sheets to sheet processing machines |
| JPS59215U (en) * | 1983-04-28 | 1984-01-05 | 株式会社東芝 | Opening/closing control device |
| IT1188121B (en) * | 1986-04-30 | 1987-12-30 | Nebiolo Spa | PROCEDURE FOR TRANSFERRING A SHEET OF PAPER FROM A TABLE TO A PRESS CYLINDER IN A PRINTING MACHINE AND SWINGING CLAMP UNIT TO PERFORM THIS PROCEDURE |
| JPS63132734U (en) * | 1987-02-20 | 1988-08-30 | ||
| JPS6449644A (en) * | 1987-08-21 | 1989-02-27 | Toppan Printing Co Ltd | Metal sheet offset press |
| DE4113478C2 (en) * | 1991-04-25 | 1994-05-05 | Heidelberger Druckmasch Ag | Sheet control device on a sheet-feeding cylinder of a printing press |
| DE4116409C2 (en) * | 1991-05-18 | 1995-01-05 | Roland Man Druckmasch | Side mark and overturn control of a rotary sheet printing machine |
-
1992
- 1992-07-01 DE DE4221578A patent/DE4221578A1/en not_active Withdrawn
-
1993
- 1993-05-05 EP EP93107251A patent/EP0576801B1/en not_active Expired - Lifetime
- 1993-05-05 DE DE59304023T patent/DE59304023D1/en not_active Expired - Fee Related
- 1993-05-05 AT AT93107251T patent/ATE143646T1/en not_active IP Right Cessation
- 1993-06-28 US US08/084,343 patent/US5390908A/en not_active Expired - Fee Related
- 1993-06-29 JP JP5158647A patent/JP2851515B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US5390908A (en) | 1995-02-21 |
| JPH0664784A (en) | 1994-03-08 |
| EP0576801A1 (en) | 1994-01-05 |
| ATE143646T1 (en) | 1996-10-15 |
| DE59304023D1 (en) | 1996-11-07 |
| DE4221578A1 (en) | 1994-01-05 |
| JP2851515B2 (en) | 1999-01-27 |
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