EP0175150B1 - Sheet feeder - Google Patents

Sheet feeder Download PDF

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Publication number
EP0175150B1
EP0175150B1 EP85110285A EP85110285A EP0175150B1 EP 0175150 B1 EP0175150 B1 EP 0175150B1 EP 85110285 A EP85110285 A EP 85110285A EP 85110285 A EP85110285 A EP 85110285A EP 0175150 B1 EP0175150 B1 EP 0175150B1
Authority
EP
European Patent Office
Prior art keywords
sheet
reflex light
light barrier
side edge
stack
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
Application number
EP85110285A
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German (de)
French (fr)
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EP0175150A1 (en
Inventor
Gerhard Pollich
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
Original Assignee
Heidelberger Druckmaschinen AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0175150A1 publication Critical patent/EP0175150A1/en
Application granted granted Critical
Publication of EP0175150B1 publication Critical patent/EP0175150B1/en
Expired legal-status Critical Current

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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
    • B65H1/00—Supports or magazines for piles from which articles are to be separated
    • B65H1/04—Supports or magazines for piles from which articles are to be separated adapted to support articles substantially horizontally, e.g. for separation from top of pile
    • 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
    • B65H7/10—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 side 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
    • B65H9/00—Registering, e.g. orientating, articles; Devices therefor
    • B65H9/20—Assisting by photoelectric, sonic, or pneumatic indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/30—Orientation, displacement, position of the handled material
    • B65H2301/36—Positioning; Changing position
    • B65H2301/363—Positioning; Changing position of material in pile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices
    • B65H2801/21—Industrial-size printers, e.g. rotary printing press

Definitions

  • the stacks to be processed by sheet layers often show such a large offset that an additional lateral pre-correction of the entire stack or else of the sheet on the feed table is necessary.
  • the transfer errors in the sheet separation can be taken into account in an advantageous manner.
  • the evaluation result can also be influenced by simply adjusting their distance.
  • the transport device that feeds the sheet 5 of the machine 6 or a cylinder 7 of the machine 6 is first formed by a feed table 8.
  • Endless conveyor belts 9, which are driven by a deflecting roller 10, are arranged on this at certain intervals (see FIG. 2), two deflecting rollers 10, 11, which extend over the entire width, being provided in the sheet running direction before and after the feed table.
  • a further roller 12 also regulates the tension of the conveyor belts 9.
  • These are each assigned a plurality of transport rollers 13 on the feed table 8 and clock rollers 15 which are mounted in a longitudinally displaceable manner on a crossbar 14 by means of a support arm 26. Depending on the sheet processing speed of the machine 6, these are placed on or off the already separated sheets 5 in cycles, which is caused by the crossmember 14 which can be pivoted about its axis.
  • a further traverse 16 is provided, extending over the width of the sheet feeder 1 determined by the side parts 27.
  • optical detection devices designed as reflective light barriers 19, 20 are fastened thereon by means of brackets 17 which can be locked on the crossbar 16 by means of clamping screws 18.
  • the control signals for triggering the corrective movement of the stacking table 3 result from the different light reflectance when it hits the white paper sheet 5 or in the "empty space".
  • the evaluation result can be made variable, for example by adjusting its distance.
  • both reflective light barriers 19, 20 are assigned to a lateral sheet edge 21.
  • the sheets 5 are separated outside a certain tolerance range and assume the position shown in broken lines in FIG. 4, they are detected by both reflective light barriers 19, 20, which results in a specific actuating signal. This is transmitted to a servomotor 24, which laterally adjusts the stacking table 3 by a predetermined amount in the corresponding direction (to the right).
  • An actuating signal for the stack movement in the other direction is issued when, in an equivalent manner, the separated sheets 5 assume the position shown in dashed lines in FIG. 4 (both reflective light barriers 19, 20 go into the “empty space”).
  • a further possibility would also be to assign a reflection light barrier 19, 20 to each of the two lateral sheet edges 21, 23. Additional information regarding the sheet width could be derived from this.
  • T a specific response time of the reflex light barrier 19, 20 in question.
  • the number of sheets 5 from which the servomotor 24 carries out a corrective movement of the stack 2 can advantageously be predetermined.
  • the transfer errors in the sheet separation can be taken into account in an advantageous manner, so that finally the side drawing mark 25 has only a slight final alignment for the exact registration of the sheets 5.
  • the device shown is an extremely short reaction time to realize.

Description

Die Erfindung betrifft einen Bogenanleger für bogenverarbeitende Maschinen mit einer Einrichtung zum selbsttätigen Ausrichten der Seitenlage eines Stapels, von dem die jeweils zu vereinzelnden Bogen von einer Transporteinrichtung erfassbar und der bogenverarbeitenden Maschine zuführbar sind, wobei ein Stellmotor auf einen quer zur Bogenförderrichtung bewegbar gelagerten, den Stapel tragenden Stapeltisch einwirkt und von einer Bogen-Istlage-Erkennungseinrichtung die jeweiligen Stellsignale erhält.The invention relates to a sheet feeder for sheet-processing machines with a device for automatically aligning the side position of a stack, from which the sheets to be separated in each case can be detected by a transport device and fed to the sheet-processing machine, with an actuator on a stack that is movably mounted transversely to the sheet conveying direction bearing stacking table acts and receives the respective control signals from a sheet actual position detection device.

In bogenverarbeitenden Maschinen, insbesondere Druckmaschinen, wird der von einem Stapel vereinzelte Bogen in der Regel über einen Zuführtisch der Maschine zugeführt, um von dieser verarbeitet zu werden. Dabei ist der Maschine unmittelbar eine sogenannte Seitenausrichtvorrichtung zugeordnet, welche den Bogen an eine seitliche Marke bewegt, um dadurch für seine Weiterverarbeitung eine exakte seitliche Ausrichtung zu gewährleisten. Die vorgesehene Seitenausrichtvorrichtung gleicht dabei einen seitlichen Versatz der einzelnen Bogen von einigen Millimetern aus.In sheet-processing machines, in particular printing machines, the sheet which is separated from a stack is generally fed to the machine via a feed table in order to be processed by the machine. In this case, the machine is directly assigned a so-called side alignment device, which moves the sheet to a lateral mark in order to ensure an exact lateral alignment for its further processing. The provided side alignment device compensates for a lateral offset of the individual sheets of a few millimeters.

Die von Bogenlegern zu verarbeitenden Stapel zeigen aber häufig einen so starken Versatz, dass eine zusätzliche seitliche Vorkorrektur des gesamten Stapels oder aber des auf dem Zuführtisch sich befindenden Bogens vonnöten ist.However, the stacks to be processed by sheet layers often show such a large offset that an additional lateral pre-correction of the entire stack or else of the sheet on the feed table is necessary.

Aus der DD-PS 126 585 ist daher eine Vorrichtung bekannt geworden, bei der die Bogen-Ist-Lage unmittelbar nach der Vereinzelung festgestellt wird. Aufgrund eines Signals der dort verwendeten optischen Erkennungseinrichtung werden dann die Fördermittel, längs welcher die Bogen über den Anlegetisch geführt werden, entsprechend dem festgestellten Versatz in bezug auf die normale Förderrichtung verschwenkt. Der durch Sauger festgehaltene Bogen führt dadurch während seines Transports eine senkrecht zu dieser Bewegung gerichtete zusätzliche Querbewegung aus.From DD-PS 126 585 a device has therefore become known in which the actual sheet position is determined immediately after the separation. On the basis of a signal from the optical detection device used there, the conveying means along which the sheets are guided over the feed table are then pivoted in accordance with the determined offset with respect to the normal conveying direction. The sheet held in place by suction cups thereby executes an additional transverse movement directed perpendicular to this movement during its transport.

Der hierbei verwendete Bogen-Istlage-Geber weist zwei untereinander beabstandete Sensoren auf. Diese werden unter festem gegenseitigen Abstand und unter Anbindung an eine Zugstange der jeweiligen Istlage der Bogen in ihrer Position unmittelbar nach dem Stapel nachgeführt.The actual sheet position sensor used here has two sensors spaced apart from one another. These are adjusted in their position immediately after the stack at a fixed mutual distance and with connection to a pull rod of the respective actual position of the sheet.

Ein wesentlicher Nachteil einer solchen Vorrichtung ist insbesondere darin zu sehen, dass eine relativ aufwendige Korrekturvorrichtung notwendig ist, da, abgesehen vom mechanischen Steuermechanismus, eine zusätzliche Saugeinrichtung mit entsprechender Steuerung und Zufuhr der Saugluft erforderlich ist.A major disadvantage of such a device can be seen in particular in the fact that a relatively complex correction device is necessary since, apart from the mechanical control mechanism, an additional suction device with corresponding control and supply of the suction air is required.

Aus der DE-OS 3 210 943 ist weiterhin eine Vorrichtung bekannt, bei der die Lage der einzelnen Papierbogen bei Anlage an der bogenverarbeitenden Maschine vor ihrer Seitenausrichtung erfasst und entsprechend dieser Lage ein Stellmotor angesteuert wird, der die Plattform, auf der der Bogenstapel liegt, quer zur Förderrichtung verstellt. Der aus dieser Vorgehensweise sich ableitende Regelkreis ist in besonderem Masse totzeitbehaftet, da erst nach ca. 6-8 Bogen, je nach Schuppenstromlänge, eine korrigierende Bewegung des Bogenstapels eintritt. Darüber hinaus wird durch die verwendete einzelne Photozelle mit zugehöriger Lichtquelle durch jeden einzelnen ankommenden Bogen; gleichgültig welche Ist-Lage er einnimmt, der Stellmotor zu Korrekturzwecken aktiviert.From DE-OS 3 210 943 a device is also known in which the position of the individual sheets of paper when they are in contact with the sheet-processing machine is detected prior to their side alignment, and an actuator is actuated in accordance with this position, which actuates the platform on which the sheet stack lies. adjusted transversely to the conveying direction. The control circuit derived from this procedure is particularly subject to dead time, since a corrective movement of the sheet stack only occurs after approx. 6-8 sheets, depending on the scale flow length. In addition, the single photocell used with the associated light source through each individual incoming sheet; no matter what actual position it is in, the servomotor is activated for correction purposes.

Von dem genannten Stand der Technik ausgehend liegt der vorliegenden Erfindung die Aufgabe zugrunde, einen Bogenanleger für bogenverarbeitende Maschinen zu schaffen, bei dem die Ist-Lage-Ermittlung und die Korrektur der einzelnen Bogen ohne grossen konstruktiven Aufwand und unter Vermeidung unnötiger Stellvorgänge über einen rasch reagierenden Steuermechanismus erfolgen kann, wobei aber dennoch die Übergabefehler des Vereinzelungs- und Transportmechanismus erfasst werden.Based on the prior art mentioned, the present invention has for its object to provide a sheet feeder for sheet-processing machines, in which the actual position determination and the correction of the individual sheets without great design effort and avoiding unnecessary adjustment processes via a quickly responding Control mechanism can take place, but still the transfer errors of the separation and transport mechanism are detected.

Die vorgenannte Aufgabe wird durch eine Einrichtung gemäss den Merkmalen des Hauptanspruches gelöst.The above object is achieved by a device according to the features of the main claim.

Mit der erfindungsgemässen Anordnung der Reflexlichtschranken können in vorteilhafter Weise die Übergabefehler bei der Bogenvereinzelung berücksichtigt werden.With the arrangement of the reflex light barriers according to the invention, the transfer errors in the sheet separation can be taken into account in an advantageous manner.

Durch die Verwendung von zwei voneinander unabhängig positionierbaren Reflexlichtschranken kann ausserdem das Auswerteergebnis durch einfaches Verstellen von deren Abstand beeinflusst werden.By using two reflective light barriers that can be positioned independently of one another, the evaluation result can also be influenced by simply adjusting their distance.

Durch diese überraschend einfache Massnahme wird die Folge der Stellsignale optimiert, was zur Folge hat, dass unnötige Stellvorgänge mit unnötigem Leistungsaufwand vermieden werden, wenn sich die Istlagen der von der Transporteinrichtung erfassten Bogen innerhalb wählbarer Toleranzen bewegen.This surprisingly simple measure optimizes the sequence of control signals, which means that unnecessary control processes with unnecessary effort are avoided if the actual positions of the sheets detected by the transport device move within selectable tolerances.

Werden die beiden verwendeten Reflexlichtschranken nicht nur einer seitlichen Bogenkante zugeordnet, sondern jeder seitlichen Bogenkante jeweils eine Reflexlichtschranke, so sind zusätzliche Informationen bezüglich der Bogenbreite möglich.If the two reflective light barriers used are not only assigned to one side edge of the sheet, but each side edge of the sheet has a reflected light barrier, additional information regarding the sheet width is possible.

Um ggf. zu verhindern, dass bei lediglich einem einzelnen ausserhalb der Toleranz liegenden Bogen ein Stellsignal an den Stellmotor ergeht, kann dieses Stellsignal von einer bestimmten Ansprechdauer der betreffenden Reflexlichtschranke abhängig gemacht werden.In order to prevent, if necessary, that an actuating signal is sent to the servomotor in the case of only a single sheet lying outside the tolerance, this actuating signal can be made dependent on a specific response time of the reflex light barrier in question.

Weitere wesentliche Vorteile der erfindungsgemässen Einrichtung lassen sich aus der nachstehenden Figurenbeschreibung sowie aus den Unteransprüchen ableiten.Further essential advantages of the device according to the invention can be derived from the following description of the figures and from the subclaims.

Ein Ausführungsbeispiel ist in den Zeichnungen dargestellt.An embodiment is shown in the drawings.

Dabei zeigt:

  • Fig. 1 einen Bogenanleger mit der erfindungsgemäss angeordneten Erkennungseinrichtung,
  • Fig. 2 eine Draufsicht auf den Bogenanleger gemäss Fig. 1,
  • Fig. 3 eine vergrösserte Darstellung der Erkennungseinrichtung aus Fig. 1 und
  • Fig. 4 eine weitere Draufsicht auf den Schuppenstrom mit unterschiedlichen Bogen-Istlagen.
It shows:
  • 1 is a sheet feeder with the detection device arranged according to the invention,
  • 2 is a plan view of the sheet feeder of FIG. 1,
  • Fig. 3 is an enlarged view of the detection device of Fig. 1 and
  • Fig. 4 shows a further top view of the scale flow with different actual sheet positions.

In dem in Fig. 1 dargestellten Bogenanleger 1 befindet sich der Stapel 2, welcher auf einem Stapeltisch 3 aufliegt. Die Bogenvereinzelung erfolgt von oben über eine pneumatisch wirkende Vereinzelungsvorrichtung 4, die den jeweils obersten Bogen 5 vom Stapel 2 trennt und dem weiteren Transportmechanismus zuführt.In the sheet feeder 1 shown in Fig. 1 is the stack 2, which rests on a stacking table 3. The sheet is separated from above via a pneumatically acting separating device 4, which is the top sheet 5 separates from the stack 2 and feeds the further transport mechanism.

Die den Bogen 5 der Maschine 6 bzw. einem Zylinder 7 der Maschine 6 zuführende Transporteinrichtung wird zunächst von einem Zuführtisch 8 gebildet. Auf diesem sind in gewissen Abständen (siehe Fig. 2) endlose Transportbänder 9 angeordnet, die von einer Umlenkwalze 10 angetrieben werden, wobei in Bogenlaufrichtung vor und nach dem Zuführtisch zwei dieser, über die gesamte Breite sich erstreckende Umlenkwalzen 10, 11 vorgesehen sind. Eine weitere Walze 12 reguliert ausserdem die Spannung der Transportbänder 9. Diesen sind auf dem Zuführtisch 8 jeweiis mehrere Transportrollen 13 sowie auf einer Traverse 14 mittels Tragarm 26 längsverschieblich gelagerte Taktrollen 15 zugeordnet. Diese setzen entsprechend der Bogenverarbeitungsgeschwindigkeit der Maschine 6 taktweise auf die bereits vereinzelten Bogen 5 auf bzw. heben davon ab, was von der um ihre Achse schwenkbaren Traverse 14 bewirkt wird.The transport device that feeds the sheet 5 of the machine 6 or a cylinder 7 of the machine 6 is first formed by a feed table 8. Endless conveyor belts 9, which are driven by a deflecting roller 10, are arranged on this at certain intervals (see FIG. 2), two deflecting rollers 10, 11, which extend over the entire width, being provided in the sheet running direction before and after the feed table. A further roller 12 also regulates the tension of the conveyor belts 9. These are each assigned a plurality of transport rollers 13 on the feed table 8 and clock rollers 15 which are mounted in a longitudinally displaceable manner on a crossbar 14 by means of a support arm 26. Depending on the sheet processing speed of the machine 6, these are placed on or off the already separated sheets 5 in cycles, which is caused by the crossmember 14 which can be pivoted about its axis.

In unmittelbarem Bereich dieser Taktrollen 15 ist, sich über die durch die Seitenteile 27 bestimmte Breite des Bogenanlegers 1 erstreckend, eine weitere Traverse 16 vorgesehen. Darauf sind, wie Fig. 3 zeigt, mittels Halterungen 17, die über Klemmschrauben 18 auf der Traverse 16 arretierbar sind, als Reflexlichtschranken 19, 20 ausgeführte optische Erkennungseinrichtungen befestigt. Die Stellsignale zur Auslösung der Korrekturbewegung des Stapeltisches 3 ergeben sich dabei aufgrund des unterschiedlichen Licht-Reflexionsgrades, wenn dieses auf den weissen Papierbogen 5 oder aber ins «Leere» trifft.In the immediate area of these clock rollers 15, a further traverse 16 is provided, extending over the width of the sheet feeder 1 determined by the side parts 27. As shown in FIG. 3, optical detection devices designed as reflective light barriers 19, 20 are fastened thereon by means of brackets 17 which can be locked on the crossbar 16 by means of clamping screws 18. The control signals for triggering the corrective movement of the stacking table 3 result from the different light reflectance when it hits the white paper sheet 5 or in the "empty space".

Aufgrund der voneinander unabhängigen Positionierbarkeit der Reflexlichtschranken 19, 20 entlang der Traverse 16 kann das Auswerteergebnis, beispielsweise durch Verstellen ihres Abstandes variabel gestaltet werden. Wie Fig. 4 zeigt, sind im Ausführungsbeispiel beide Reflexlichtschranken 19, 20 einer seitlichen Bogenkante 21 zugeordnet.Because the reflective light barriers 19, 20 can be positioned along the cross member 16 independently of one another, the evaluation result can be made variable, for example by adjusting its distance. As shown in FIG. 4, in the exemplary embodiment both reflective light barriers 19, 20 are assigned to a lateral sheet edge 21.

Während der Lichtstrahl 22 einer der Reflexlichtschranken 19 auf die Bogen 5 trifft, geht der Lichtstrahl 22 der anderen Reflexlichtschranke 20 ins «Leere». Die Bogenlage wird als optimal erkannt und ist daher nicht korreturbedürftig.While the light beam 22 of one of the reflective light barriers 19 hits the sheet 5, the light beam 22 of the other reflective light barrier 20 goes into the "empty". The sheet position is recognized as optimal and is therefore not in need of correction.

Werden nun aufgrund eines seitlichen Versatzes des Stapels 2 die Bogen 5 ausserhalb eines gewissen Toleranzbereiches vereinzelt und nehmen die in Fig. 4 strichpunktiert dargestellte Position ein, so werden sie von beiden Reflexlichtschranken 19, 20 erfasst, was ein bestimmtes Stellsignal zur Folge hat. Dieses wird einem Stellmotor 24 übermittelt, welcher den Stapeltisch 3 um ein vorgegebenes Mass in die entsprechende Richtung (nach rechts) seitlich verstellt.If, due to a lateral offset of the stack 2, the sheets 5 are separated outside a certain tolerance range and assume the position shown in broken lines in FIG. 4, they are detected by both reflective light barriers 19, 20, which results in a specific actuating signal. This is transmitted to a servomotor 24, which laterally adjusts the stacking table 3 by a predetermined amount in the corresponding direction (to the right).

Ein Stellsignal zur Stapelbewegung in die andere Richtung ergeht, wenn in äquivalenter Weise die vereinzelten Bogen 5 die in Fig. 4 gestrichelt dargestellte Position einnehmen (beide Reflexlichtschranken 19, 20 gehen ins «Leere»).An actuating signal for the stack movement in the other direction is issued when, in an equivalent manner, the separated sheets 5 assume the position shown in dashed lines in FIG. 4 (both reflective light barriers 19, 20 go into the “empty space”).

Eine weitere Möglichkeit wäre auch, jeder der beiden seitlichen Bogenkanten 21, 23 eine Reflexlichtschranke 19, 20 zuzuordnen. Daraus könnten zusätzliche Informationen bezüglich der Bogenbreite abgeleitet werden.A further possibility would also be to assign a reflection light barrier 19, 20 to each of the two lateral sheet edges 21, 23. Additional information regarding the sheet width could be derived from this.

Um ggf. zu verhindern, dass bereits bei einem einzelnen ausserhalb der Toleranz liegenden Bogen 5 ein Signal an den Stellmotor 24 ergeht, wäre denkbar, dieses Stellsignal in Abhängigkeit von einer bestimmten Ansprechdauer (T) der betreffenden Reflexlichtschranke 19, 20 zu wählen. Die Ansprechdauer (T) sollte dabei stufenweise einstellbar sein, wobei eine Zeitstufe einer aus Bogenlänge (I) und Transportgeschwindigkeit (v) sich ergebenden Zeitspanne (T,) entspricht (T, = I/v). Ist erst beim n-ten ausserhalb der Toleranz liegenden Bogen 5 ein Stellsignal erwünscht, so ist T = n - Ti einzustellen (ganzzahliges Vielfaches). Um dies zu verwirklichen, wäre in die vorzusehende elektrische Steuerschaltung beispielsweise ein rückstellbares oder einschaltverzögertes Zeitrelais einzubeziehen.In order to prevent a signal from being sent to the servomotor 24 in the case of a single sheet 5 lying outside the tolerance, it would be conceivable to select this actuating signal as a function of a specific response time (T) of the reflex light barrier 19, 20 in question. The response time (T) should be adjustable in steps, whereby a time step corresponds to a time span (T,) resulting from the sheet length (I) and transport speed (v) (T, = I / v). If an actuating signal is only desired for the nth arc 5 lying outside the tolerance, then T = n - T i must be set (integer multiple). In order to achieve this, a resettable or delayed switch-on time relay would have to be included in the electrical control circuit to be provided.

Dadurch kann in vorteilhafter Weise die Anzahl der Bogen 5 vorherbestimmt werden, ab der der Stellmotor 24 eine Korrekturbewegung des Stapels 2 ausführt. Mit der erfindungsgemässen Anordnung der Reflexlichtschranken 19, 20 können in vorteilhafter Weise die Übergabefehler bei der Bogenvereinzelung berücksichtigt werden, so dass schliesslich der Seitenziehmarke 25 nur noch eine geringfügige Endausrichtung für die exakte Registerhaltigkeit der Bogen 5 zukommt.As a result, the number of sheets 5 from which the servomotor 24 carries out a corrective movement of the stack 2 can advantageously be predetermined. With the arrangement of the reflective light barriers 19, 20 according to the invention, the transfer errors in the sheet separation can be taken into account in an advantageous manner, so that finally the side drawing mark 25 has only a slight final alignment for the exact registration of the sheets 5.

Sollte bereits bei dem ersten, ausserhalb eines Toleranzbereiches geförderten Bogen 5 oder bereits mehr oder weniger unmittelbar nach dessen Registrierung durch die Reflexlichtschranken 19, 20 eine Seitenverschiebung des Stapels 2 erfolgen (T, Ti), dann ist mit der gezeigten Einrichtung eine äusserst kurze Reaktionszeit zu verwirklichen.If the first sheet 5 conveyed outside of a tolerance range or already more or less immediately after its registration by the reflective light barriers 19, 20 there is a lateral shift of the stack 2 (T, T i ), then the device shown is an extremely short reaction time to realize.

Claims (4)

1. Sheet feeder for sheet processing machines, in which a
separating device (4) for the sheets, a conveying device (8 to 15) for the supply of the separated sheets to the machine (6) and a device for automatic alignment of the lateral position of the stack are assigned to a stack (2) of sheets (5) to be processed,
the device for automatic alignment of the lateral position comprising a servomotor (24) being in operating contact with a sheet stack-bearing table (3) adapted to move transversely to the sheet transport direction, and an actual sheet-position detection device giving control signals to the servomotor,
the actual sheet-position detection device comprising a non-contact actual sheet-position detector arranged immediately behind the stack, as viewed in sheet transport direction, wherein
the actual sheet-position detector comprises a first and a second reflex light barrier being positioned longitudinally displaceable on a traverse (16) extending transversely to the sheet transport direction, said reflex light barriers being lockable in one of a first, a second and a third configuration, respectively, with regard to said first and second side edges in selected distances between said first and said second reflex light barrier inside and outside of a sheet area within two imagined vertical planes, each of said planes including one of a first and a second side edge of a sheet picked up by the conveying device,
in said first configuration said first reflex light barrier being arranged outside said sheet area and said second reflex light barrier being arranged inside said sheet area and said first and said second reflex light barrier being adjacent to one of said first and second side edges,
in said second configuration the first reflex light barrier being arranged outside said sheet area and adjacent to said first side edge and said second reflex light barrier being arranged outside said sheet area and adjacent to said second side edge,
in said third configuration said first reflex light barrier being arranged inside said sheet area and adjacent to said first side edge and said second reflex light barrier being arranged inside said sheet area and adjacent said second side edge.
2. Sheet feeder according to Claim 1, wherein, with both reflex light barriers being assigned to one and the same side edge of a sheet and with sheets being fed within a given tolerance, the sheet is covered by only one of the two reflex light barriers, and in case of the sheet transport needing to be corrected the sheet is covered by none or both reflex light barriers.
3. Sheet feeder according to Claim 1, wherein a control signal is given to the servomotor (24), the control signal being dependent on a predetermined response time of the actual sheet-position detection device (16 to 20).
4. Sheet feeder according to Claim 1, wherein the response time (T) can be set stepwise, one time step corresponding to a time span (Ti = I/v) resulting from sheet length (I) and transport speed (v), during which a single sheet (5) influences the detection device (16 to 20), whereby T preferably can be less, equal to or an integral multiple of Ti.
EP85110285A 1984-09-15 1985-08-17 Sheet feeder Expired EP0175150B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3433994 1984-09-15
DE19843433994 DE3433994A1 (en) 1984-09-15 1984-09-15 BOW FEEDER FOR BOW PROCESSING MACHINES

Publications (2)

Publication Number Publication Date
EP0175150A1 EP0175150A1 (en) 1986-03-26
EP0175150B1 true EP0175150B1 (en) 1988-05-11

Family

ID=6245534

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85110285A Expired EP0175150B1 (en) 1984-09-15 1985-08-17 Sheet feeder

Country Status (5)

Country Link
US (1) US4635924A (en)
EP (1) EP0175150B1 (en)
JP (1) JPS6175742A (en)
CA (1) CA1259637A (en)
DE (1) DE3433994A1 (en)

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US4811939A (en) * 1987-08-24 1989-03-14 Midaco Corporation Printing platform
US4971311A (en) * 1987-09-24 1990-11-20 Komori Printing Machinery Co., Ltd. Feeder for sheet-feed printing machine
DE4005910A1 (en) * 1990-02-24 1991-09-05 Heidelberger Druckmasch Ag ARC SEPARATOR IN A PRINTING MACHINE
DE4023877C2 (en) * 1990-07-27 1996-09-05 Heidelberger Druckmasch Ag Sheet processing machine and associated transport device for sheet stacks
US5067703A (en) * 1990-08-20 1991-11-26 Midaco Corporation Automatic pallet centering device
DE4331610A1 (en) * 1993-09-17 1995-03-23 Roland Man Druckmasch Sheet feeder unit
DE10028070B4 (en) * 2000-06-09 2008-11-13 Koenig & Bauer Aktiengesellschaft Device for format-dependent position detection of the sheet leading edge in the feeder of sheet-processing machines
DE10033490B4 (en) 2000-07-10 2018-05-24 Koenig & Bauer Ag Device for laterally aligning bows
WO2006065757A2 (en) * 2004-12-13 2006-06-22 Moore James L Feeder/delivery board for printing press
WO2007098125A2 (en) * 2006-02-17 2007-08-30 Moore James L Adjustable feeder/delivery board for printing press
DE102006046526B4 (en) * 2006-09-29 2019-05-09 Koenig & Bauer Ag Method and device for aligning a stack of sheets at the feeder of a sheet-fed rotary printing machine
US20110048262A1 (en) * 2009-08-27 2011-03-03 Martinez Aaron D Integral sheet hold-down device for uv led curing lamp

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US1948001A (en) * 1931-11-18 1934-02-20 Dexter Folder Co Sheet feeder
US3244418A (en) * 1963-11-26 1966-04-05 James G Henderson Edge sensing device
JPS4862449A (en) * 1971-12-03 1973-08-31
DE2202851C3 (en) * 1972-01-21 1981-04-23 Weitmann & Konrad GmbH & Co KG, 7023 Echterdingen Control device for automatic print adjustment and later infeed and feed control in sheet-guiding printing machines
DE2547778C3 (en) * 1975-10-24 1986-03-27 Georg Spiess Gmbh, 8906 Gersthofen Sheet feeder
DD131549B1 (en) * 1977-03-04 1979-12-27 Frank Fichte DEVICE FOR SIDE-ALIGNING THE BOW STACK
DE2724832B2 (en) * 1977-06-02 1981-01-15 Mabeg Maschinenbau Gmbh Nachf. Hense & Pleines Gmbh & Co, 6050 Offenbach Sheet feeder
DE3210943A1 (en) * 1982-03-25 1983-10-06 Mabeg Maschinenbau Gmbh Nachf Sheet feeder
JPS59109066A (en) * 1982-12-14 1984-06-23 Minolta Camera Co Ltd Automatic correcting device of side slippage of original in multicopy copying machine
JPS60484A (en) * 1983-06-16 1985-01-05 松下電器産業株式会社 Color electrooptic display
JPS6147770A (en) * 1984-08-10 1986-03-08 Otsuka Chem Co Ltd Coating agent for electrically-conductive floor and floor covering material

Also Published As

Publication number Publication date
DE3433994A1 (en) 1986-03-27
JPH0474259B2 (en) 1992-11-25
US4635924A (en) 1987-01-13
CA1259637A (en) 1989-09-19
EP0175150A1 (en) 1986-03-26
JPS6175742A (en) 1986-04-18

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