EP1588964B1 - Feeding device for a stack of sheets along a curved path - Google Patents

Feeding device for a stack of sheets along a curved path Download PDF

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Publication number
EP1588964B1
EP1588964B1 EP05005501A EP05005501A EP1588964B1 EP 1588964 B1 EP1588964 B1 EP 1588964B1 EP 05005501 A EP05005501 A EP 05005501A EP 05005501 A EP05005501 A EP 05005501A EP 1588964 B1 EP1588964 B1 EP 1588964B1
Authority
EP
European Patent Office
Prior art keywords
sheet
stack
transfer point
feed
downstream
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
Application number
EP05005501A
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German (de)
French (fr)
Other versions
EP1588964A1 (en
Inventor
Klaus Stocklossa
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.)
MBO Postpress Solutions GmbH
Original Assignee
Maschinenbau Oppenweiler Binder GmbH and Co KG
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Filing date
Publication date
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Publication of EP1588964A1 publication Critical patent/EP1588964A1/en
Application granted granted Critical
Publication of EP1588964B1 publication Critical patent/EP1588964B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
    • B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
    • B65H7/06—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed
    • B65H7/12—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 double feed or separation
    • B65H7/125—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 double feed or separation sensing the double feed or separation without contacting the articles
    • 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
    • B65H1/08—Supports or magazines for piles from which articles are to be separated with means for advancing the articles to present the articles to the separating device
    • B65H1/22—Supports or magazines for piles from which articles are to be separated with means for advancing the articles to present the articles to the separating device moving in direction of plane of articles, e.g. for bodily advancement of fanned-out piles
    • B65H1/225—Round stack feeders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/08—Separating articles from piles using pneumatic force
    • B65H3/0808—Suction grippers
    • B65H3/0816—Suction grippers separating from the 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
    • B65H3/00—Separating articles from piles
    • B65H3/08—Separating articles from piles using pneumatic force
    • B65H3/10—Suction rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/24—Feeding articles in overlapping streams, i.e. by separation of articles from a 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
    • B65H7/16—Controlling air-supply to pneumatic separators
    • 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
    • B65H2301/31—Features of transport path
    • B65H2301/312—Features of transport path for transport path involving at least two planes of transport forming an angle between each other
    • 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
    • B65H2301/34—Modifying, selecting, changing direction of displacement
    • B65H2301/342—Modifying, selecting, changing direction of displacement with change of plane of displacement
    • B65H2301/3423—Modifying, selecting, changing direction of displacement with change of plane of displacement by travelling an angled curved path section for overturning and changing feeding direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/20—Location in space
    • B65H2511/22—Distance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/10—Speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/30—Forces; Stresses
    • B65H2515/34—Pressure, e.g. fluid pressure
    • 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
    • B65H2701/1313—Edges trailing edge

Definitions

  • the invention relates to a Rundstapelbogenanleger with the features of claim 1.
  • Rundstapelbogenanleger are for example from the DE 197 34 768 C1 known.
  • Fig. 1 and 2 schematically show a known Rundstapelbogenanleger 10, which has an upper table 12 and a lower table 14, which are arranged one above the other and between which a turning device 16 is provided, which applies a conveyed on the upper table 12 sheet stack 18 and deposits on the lower table 14.
  • the lower table 14 has as a feed device on a conveyor belt 20 through which the sheet stack 18 is conveyed in the direction of a transfer point 21 arranged singler 22 having a suction wheel 26 which sucks the downstreammost sheet 42 and delivers to a further transport device 24.
  • a two-armed rocker 32 is provided, which is pivotable about a pivot axis 38.
  • the upper arm 34 of the rocker 32 extends adjacent to the transfer point 21 beyond the conveying plane FE and is pivoted in the conveying direction upon impingement of the most downstream arc 42 of the sheet stack 18.
  • the other, downwardly extending arm 36 of the rocker 32 approaches in this pivoting to an analog sensor 40 which transmits a dependent of the distance of the second arm 36 output voltage to a control device (not shown), the feed rate of the conveyor belt 20 in dependence from the output voltage to the controller controls. In this case, the feed rate during the pivoting of the rocker 32 in the conveying direction is further reduced until the second arm 36 strikes the analog sensor 40 and the feed is stopped.
  • a suction valve 28 of the suction wheel 26 is activated, so that the foremost, most downstream sheet 42 is attracted by the suction wheel 26 and then deposited on the further transport device 24. At a suitable time, the suction valve 28 is turned off again.
  • the synchronization between the suction wheel 26 and the feed is designed so that at the time of activation of the suction valve 28 is always a bow 42 abuts the transfer point 21.
  • the sheets do not always arrive in the same shape on the rocker 32. They can be scaled to different heights, or they can be rounded up or down, as in the FIGS. 3 and 4 is shown.
  • upwardly curved bows are a problem because they can overlap the upper arm 34 on the rocker 32.
  • a guide plate 48 can be adjusted at the transfer point 21 in height, as indicated by the double arrow in the FIGS. 3 and 4 is shown.
  • the rocker 32 is height adjustable to adjust the upper arm 34 to extend more or less beyond the conveying plane.
  • these measures are structurally very expensive.
  • a round pile sheet feeder which has a stop at the transfer point, which is arranged opposite a suction roll for singling. At the stop runs at each transport step, the leading edge of the sheet stack, the top sheet is thereby accurately positioned before it is lifted by the suction roller over the stop. This will shorten the stack.
  • the batch feed must then be reactivated.
  • the stop is preceded by a reflected light scanner. If the diffuse reflection sensor is covered, ie as long as an arc is applied to the stop, light is reflected. If this is not the case, so the attack is exposed, no light is reflected. If no light is reflected, the feed is started until the reflected light sensor is covered again. Then the feed is switched off again. Since the feed rate is constant, it comes through the switching on and off of the feed to constant jerking movements of the sheet stack, which prevent high production speed.
  • the DE 25 05 164 B1 describes a round pile sheet feeder in which the conveyor belt is passed in the region of the unloading table between two rollers whose distance from each other is adjustable. At the downstream of the two rollers, a sensor is mounted. When a sheet strikes the probe, the feed is shut off and the topmost sheet is removed by a suction device.
  • a Rundstapelbogenanleger which has a sheet stop at the end of the transport route.
  • a capacitive scanning head is provided for non-contact scanning of the position of the uppermost sheet at the stop.
  • the invention has for its object to provide a round stack sheet feeder with structurally simple means, which ensures a safe removal of a downstream bow at the transfer point to a further transport device.
  • the distance of the downstreammost sheet from the transfer point is detected contactlessly and a detection value corresponding to the distance is forwarded to a processor device which controls the feed rate of the feed device according to the distance. Due to the non-contact detection no measures to adapt to the shape of the sheet leading edge must be made, as is the case in the prior art described above. There is little constructive effort required. In addition, the time otherwise required for adaptation can be saved.
  • the non-contact detection device is preferably formed by a light sensor, eg a light curtain, which transmits as detection value a voltage dependent on the cover through the most downstream arc, eg 0 to 10 volts, to the processor device for controlling the feed rate.
  • a light sensor eg a light curtain
  • the non-contact detection device transmits as detection value a voltage dependent on the cover through the most downstream arc, eg 0 to 10 volts, to the processor device for controlling the feed rate.
  • the detection value may also be a current value dependent on the coverage by the downstreammost arc, a serial data interface or a parallel interface.
  • a double-sheet sensor at the transfer point may be provided in addition to the non-contact detection device, which transmits a corresponding signal to the processor device for switching off the feed device when a double sheet is detected.
  • a double-sheet sensor may be, for example, the ultrasonic double-sheet control system UDC-18GM-400-3E3, which is offered by Pepperl + Fuchs GmbH.
  • a detection device which detects the trailing edge of a sheet transported on the further transport device and, upon detection of the trailing edge, transmits a signal to the processor device for controlling the arc gap. This makes it possible by means of the processor device to calculate a mean feed rate, which is then passed to the feed drive as the speed setpoint. This setpoint is determined by the processor device so that the feed device works as smoothly as possible.
  • the feed rate can also be calculated by the processor device by means of the clock sequences of the double-sheet sensor.
  • the sheet stack runs here initially fast, depending on the reaction behavior then a continuous speed can be adjusted.
  • the Rundstapelbogenanleger invention is essentially constructed as the basis of FIG. 1 A significant difference is that instead of the rocker 32, a light sensor 52 formed by a light curtain is arranged at the transfer point 21 below the conveying plane at the transfer point 21, the distance of the leading edge of a downstream bow 42 of the feed device 20th conveyed sheet stack 18 detected by the transfer point 21.
  • the light sensor 52 is an analog sensor which, depending on the coverage by the arc 42, passes a voltage value to a processor device 50, which is preferably between 0 and 10 volts. The output voltage of 10 volts is passed when no arc 42 is above the light scanner 52. The output voltage 0 is passed when the light scanner 52 is completely covered by the sheet 42.
  • the suction valve 28 of the suction wheel 26 is activated by the processor device 50, so that the most downstream sheet 42 is attracted by the suction wheel 26 and deposited on the further transport device 24.
  • an ultrasonic double-arc sensor 54 is provided below the transfer point 21.
  • This ultrasonic double-arc sensor 54 radiates from below an ultrasonic pulse, which excites the arc to vibrations. These vibrations cause the propagation of a very small sound wave on the other side of the sheet, which is evaluated by an opposite ultrasonic receiver 56. In the case of overlapping sheets (double sheet), the signal is attenuated so that it barely reaches the reception.
  • the ultrasonic double-sheet sensor 54 can detect whether there is no sheet, one sheet, or more than one sheet at the transfer point 21. As soon as the ultrasonic double-sheet sensor 54 detects that more than one sheet is at the transfer point 21, it sends a corresponding signal to the processor device 50, which then stops the feed of the conveyor belt 20 and outputs an alarm signal to the operator. hereby is prevented that superimposed sheets are placed on the further transport device 24.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Controlling Sheets Or Webs (AREA)

Description

Die Erfindung betrifft einen Rundstapelbogenanleger mit den Merkmalen des Patentanspruchs 1.The invention relates to a Rundstapelbogenanleger with the features of claim 1.

Rundstapelbogenanleger sind beispielsweise aus der DE 197 34 768 C1 bekannt. Fig. 1 und 2 zeigen schematisch einen bekannten Rundstapelbogenanleger 10, der einen Obertisch 12 und einen Untertisch 14 aufweist, die übereinander angeordnet sind und zwischen denen eine Wendeeinrichtung 16 vorgesehen ist, die einen auf dem Obertisch 12 beförderten Bogenstapel 18 wendet und auf dem Untertisch 14 ablegt. Der Untertisch 14 weist als Vorschubeinrichtung ein Förderband 20 auf, durch das der Bogenstapel 18 in Richtung einer an einer Übergabestelle 21 angeordneten Vereinzelungseinrichtung 22 befördert wird, die ein Saugrad 26 aufweist, das den stromabwärtigsten Bogen 42 ansaugt und an eine Weitertransportvorrichtung 24 abgibt.Rundstapelbogenanleger are for example from the DE 197 34 768 C1 known. Fig. 1 and 2 schematically show a known Rundstapelbogenanleger 10, which has an upper table 12 and a lower table 14, which are arranged one above the other and between which a turning device 16 is provided, which applies a conveyed on the upper table 12 sheet stack 18 and deposits on the lower table 14. The lower table 14 has as a feed device on a conveyor belt 20 through which the sheet stack 18 is conveyed in the direction of a transfer point 21 arranged singler 22 having a suction wheel 26 which sucks the downstreammost sheet 42 and delivers to a further transport device 24.

An der Übergabestelle 21 ist eine zweiarmige Wippe 32 vorgesehen, die um eine Schwenkachse 38 verschwenkbar ist. Der obere Arm 34 der Wippe 32 erstreckt sich angrenzend an die Übergabestelle 21 über die Förderebene FE hinaus und wird beim Auftreffen des stromabwärtigsten Bogens 42 des Bogenstapels 18 in Förderrichtung verschwenkt. Der andere, sich nach unten erstreckende Arm 36 der Wippe 32 nähert sich bei dieser Verschwenkung einem Analogsensor 40 an, der eine von dem Abstand des zweiten Arms 36 abhängige Ausgangsspannung an eine Steuereinrichtung (nicht gezeigt) weitergibt, die die Vorschubgeschwindigkeit des Förderbandes 20 in Abhängigkeit von der Ausgangsspannung an der Steuereinrichtung steuert. Dabei wird die Vorschubgeschwindigkeit bei der Verschwenkung der Wippe 32 in Förderrichtung immer weiter verringert, bis der zweite Arm 36 an dem Analogsensor 40 anschlägt und der Vorschub gestoppt wird. Ein Saugventil 28 des Saugrades 26 wird aktiviert, so dass der vorderste, stromabwärtigste Bogen 42 von dem Saugrad 26 angezogen und dann auf der Weitertransportvorrichtung 24 abgelegt wird. Zu einem geeigneten Zeitpunkt wird das Saugventil 28 wieder abgestellt. Die Synchronisierung zwischen Saugrad 26 und dem Vorschub ist so gestaltet, dass zum Zeitpunkt der Aktivierung des Saugventils 28 immer ein Bogen 42 an der Übergabestelle 21 anliegt.At the transfer point 21, a two-armed rocker 32 is provided, which is pivotable about a pivot axis 38. The upper arm 34 of the rocker 32 extends adjacent to the transfer point 21 beyond the conveying plane FE and is pivoted in the conveying direction upon impingement of the most downstream arc 42 of the sheet stack 18. The other, downwardly extending arm 36 of the rocker 32 approaches in this pivoting to an analog sensor 40 which transmits a dependent of the distance of the second arm 36 output voltage to a control device (not shown), the feed rate of the conveyor belt 20 in dependence from the output voltage to the controller controls. In this case, the feed rate during the pivoting of the rocker 32 in the conveying direction is further reduced until the second arm 36 strikes the analog sensor 40 and the feed is stopped. A suction valve 28 of the suction wheel 26 is activated, so that the foremost, most downstream sheet 42 is attracted by the suction wheel 26 and then deposited on the further transport device 24. At a suitable time, the suction valve 28 is turned off again. The synchronization between the suction wheel 26 and the feed is designed so that at the time of activation of the suction valve 28 is always a bow 42 abuts the transfer point 21.

Das Problem bei dieser Technik besteht darin, dass die Bogen nicht immer gleich geformt an der Wippe 32 ankommen. Sie können verschieden weit geschuppt sein oder auch nach oben oder nach unten gerundet auftreffen, wie dies in den Figuren 3 und 4 gezeigt ist. Insbesondere nach oben gerundete Bogen (Fig. 3) sind ein Problem, da sie den oberen Arm 34 an der Wippe 32 übergreifen können. Zur Anpassung an die unterschiedlichen Formen der Vorderkante der vordersten Bogen 42 sind Einrichtungen vorgesehen, durch die ein Führungsblech 48 an der Übergabestelle 21 in der Höhe verstellt werden kann, wie dies durch den Doppelpfeil in den Figuren 3 und 4 gezeigt ist. Darüber hinaus ist die Wippe 32 in der Höhe verstellbar, um den oberen Arm 34 so einzustellen, dass er sich mehr oder weniger über die Förderebene hinaus erstreckt. Diese Maßnahmen sind jedoch konstruktiv sehr aufwendig. Außerdem benötigt die Verstellung auch bei einer großen Erfahrung einer Bedienungsperson viel Zeit. Schließlich ist es mit der bekannten Wippe 32 nicht möglich zu erkennen, ob zwei Bogen 42, 46 an der Übergabestelle 21 übereinander liegen. Wenn ein solcher Doppelbogen an der Übergabestelle 21 vorhanden ist, wird der nachfolgende Bogen 46 unbeabsichtigt mitgeschleppt, wenn das Saugrad 26 den vordersten Bogen 42 ansaugt. In diesem Fall würden zwei aufeinanderliegende Bogen in eine Falzmaschine einlaufen, was zu einer Fehlfunktion führen würde.The problem with this technique is that the sheets do not always arrive in the same shape on the rocker 32. They can be scaled to different heights, or they can be rounded up or down, as in the FIGS. 3 and 4 is shown. In particular, upwardly curved bows ( Fig. 3 ) are a problem because they can overlap the upper arm 34 on the rocker 32. To adapt to the different shapes of the leading edge of the foremost sheet 42 means are provided by which a guide plate 48 can be adjusted at the transfer point 21 in height, as indicated by the double arrow in the FIGS. 3 and 4 is shown. In addition, the rocker 32 is height adjustable to adjust the upper arm 34 to extend more or less beyond the conveying plane. However, these measures are structurally very expensive. In addition, the adjustment takes much time even with a great experience of an operator. Finally, it is not possible with the known rocker 32 to detect whether two sheets 42, 46 are located one above the other at the transfer point 21. If such a double sheet is present at the transfer point 21, the subsequent sheet 46 is unintentionally entrained when the suction wheel 26 sucks the foremost sheet 42. In this case, two superimposed sheets would run into a folding machine, which would lead to a malfunction.

Aus der DE 40 13 082 A1 ist ein Rundstapelbogenanleger bekannt, der an der Übergabestelle einen Anschlag aufweist, dem gegenüberliegend eine Saugwalze zur Vereinzelung angeordnet ist. An dem Anschlag läuft bei jedem Transportschritt die Vorderkante des Bogenstapels an, dessen oberster Bogen dadurch genau positioniert wird, bevor er mittels der Saugwalze über den Anschlag hinweggehoben wird. Hierdurch wird der Stapel verkürzt. Der Stapelvorschub muss dann wieder aktiviert werden. Hierzu ist dem Anschlag ein Reflexlichttaster vorgeordnet. Wenn der Reflexlichttaster abgedeckt ist, d.h. solange ein Bogen am Anschlag anliegt, wird Licht reflektiert. Wenn dies nicht der Fall ist, also der Anschlag freiliegt, wird kein Licht reflektiert. Wenn kein Licht reflektiert wird, wird der Vorschub in Gang gesetzt und zwar solange bis der Reflexlichttaster wieder abgedeckt ist. Dann wird der Vorschub wieder abgestellt. Da die Vorschubgeschwindigkeit konstant ist, kommt es durch das Ein- und Ausschalten des Vorschubs zu ständigen Ruckbewegungen des Bogenstapels, die eine hohe Produktionsgeschwindigkeit verhindern.From the DE 40 13 082 A1 a round pile sheet feeder is known which has a stop at the transfer point, which is arranged opposite a suction roll for singling. At the stop runs at each transport step, the leading edge of the sheet stack, the top sheet is thereby accurately positioned before it is lifted by the suction roller over the stop. This will shorten the stack. The batch feed must then be reactivated. For this purpose, the stop is preceded by a reflected light scanner. If the diffuse reflection sensor is covered, ie as long as an arc is applied to the stop, light is reflected. If this is not the case, so the attack is exposed, no light is reflected. If no light is reflected, the feed is started until the reflected light sensor is covered again. Then the feed is switched off again. Since the feed rate is constant, it comes through the switching on and off of the feed to constant jerking movements of the sheet stack, which prevent high production speed.

Die DE 25 05 164 B1 beschreibt einen Rundstapelbogenanleger bei dem das Förderband im Bereich des Entnahmetisches zwischen zwei Walzen hindurchgeführt wird, deren Abstand von einander einstellbar ist. An der stromabwärtigen der beiden Walzen ist ein Fühler angebracht. Wenn ein Bogen an dem Fühler anschlägt, wird der Vorschub abgeschaltet und der oberste Bogen von einer Saugeinrichtung abgenommen.The DE 25 05 164 B1 describes a round pile sheet feeder in which the conveyor belt is passed in the region of the unloading table between two rollers whose distance from each other is adjustable. At the downstream of the two rollers, a sensor is mounted. When a sheet strikes the probe, the feed is shut off and the topmost sheet is removed by a suction device.

In der DE 33 47 147 A1 ist ein Rundstapelbogenanleger beschrieben, der am Ende des Transportweges einen Bogenanschlag aufweist. Zur berührungslosen Abtastung der Lage des obersten Bogens am Anschlag ist ein kapazitiver Abtastkopf vorgesehen.In the DE 33 47 147 A1 a Rundstapelbogenanleger is described, which has a sheet stop at the end of the transport route. For non-contact scanning of the position of the uppermost sheet at the stop a capacitive scanning head is provided.

Der Erfindung liegt die Aufgabe zugrunde, mit konstruktiv einfachen Mitteln einen Rundstapelbogenanleger zu schaffen, der eine sichere Abnahme eines stromabwärtigsten Bogens an der Übergabestelle zu einer Weitertransportvorrichtung gewährleistet.The invention has for its object to provide a round stack sheet feeder with structurally simple means, which ensures a safe removal of a downstream bow at the transfer point to a further transport device.

Diese Aufgabe wird erfindungsgemäß durch einen Rundstapelbogenanleger mit den Merkmalen des Patentanspruchs 1 gelöst. Vorteilhafte Weiterbildungen des erfindungsgemäßen Rundstapelbogenanlegers sind Gegenstand der Patentansprüche 2 bis 5.This object is achieved by a Rundstapelbogenanleger with the features of claim 1. Advantageous developments of the Rundstapelbogenanlegers invention are the subject of claims 2 to 5.

Bei dem erfindungsgemäßen Rundstapelbogenanleger wird der Abstand des stromabwärtigsten Bogens von der Übergabestelle berührungslos erfasst und ein dem Abstand entsprechender Erfassungswert an eine Prozessoreinrichtung weitergegeben, die die Vorschubgeschwindigkeit der Vorschubeinrichtung dem Abstand entsprechend steuert. Aufgrund der berührungslosen Erfassung müssen keine Maßnahmen zur Anpassung an die Form der Bogenvorderkante getroffen werden, wie dies beim oben beschriebenen Stand der Technik der Fall ist. Es ist wenig konstruktiver Aufwand erforderlich. Außerdem kann die sonst zur Anpassung erforderliche Zeit eingespart werden.In the round-pile sheet feeder according to the invention, the distance of the downstreammost sheet from the transfer point is detected contactlessly and a detection value corresponding to the distance is forwarded to a processor device which controls the feed rate of the feed device according to the distance. Due to the non-contact detection no measures to adapt to the shape of the sheet leading edge must be made, as is the case in the prior art described above. There is little constructive effort required. In addition, the time otherwise required for adaptation can be saved.

Die berührungslose Erfassungseinrichtung wird vorzugsweise von einem Lichttaster, z.B. einem Lichtvorhang, gebildet, der als Erfassungswert eine von der Abdeckung durch den stromabwärtigsten Bogen abhängige Spannung, z.B. 0 bis 10 Volt an die Prozessoreinrichtung zur Steuerung der Vorschubgeschwindigkeit weitergibt.The non-contact detection device is preferably formed by a light sensor, eg a light curtain, which transmits as detection value a voltage dependent on the cover through the most downstream arc, eg 0 to 10 volts, to the processor device for controlling the feed rate.

Der Erfassungswert kann auch ein von der Abdeckung durch den stromabwärtigsten Bogen abhängiger Stromwert, eine serielle Datenschnittstelle oder eine parallele Schnittstelle sein.The detection value may also be a current value dependent on the coverage by the downstreammost arc, a serial data interface or a parallel interface.

Um zu verhindern, dass zwei übereinanderliegende Bogen von der Saugeinrichtung gleichzeitig auf der Weitertransportvorrichtung abgelegt werden, kann neben der berührungslosen Erfassungseinrichtung vorzugsweise ein Doppelbogensensor an der Übergabestelle vorgesehen werden, der bei Erfassung eines Doppelbogens ein entsprechendes Signal an die Prozessoreinrichtung zur Abschaltung der Vorschubeinrichtung weitergibt. Ein solcher Doppelbogensensor kann beispielsweise das Ultraschall-Doppelbogenkontrollsystem UDC-18GM-400-3E3 sein, das von der Pepperl + Fuchs GmbH angeboten wird.In order to prevent two superimposed sheets from being simultaneously deposited on the forwarding device by the suction device, a double-sheet sensor at the transfer point may be provided in addition to the non-contact detection device, which transmits a corresponding signal to the processor device for switching off the feed device when a double sheet is detected. Such a double-sheet sensor may be, for example, the ultrasonic double-sheet control system UDC-18GM-400-3E3, which is offered by Pepperl + Fuchs GmbH.

Bei einer bevorzugten Ausführungsform ist ein die Hinterkante eines auf der Weitertransporteinrichtung transportierten Bogens erfassende Erfassungseinrichtung vorgesehen, die bei Erfassung der Hinterkante ein Signal an die Prozessoreinrichtung zur Steuerung der Bogenlücke weitergibt. Hierdurch ist es mittels der Prozessoreinrichtung möglich, eine mittlere Vorschubgeschwindigkeit zu berechnen, die dem Vorschubantrieb dann als Geschwindigkeits-Sollwert übergeben wird. Dieser Sollwert wird durch die Prozessoreinrichtung so bestimmt, dass die Vorschubeinrichtung möglichst ruckfrei arbeitet.In a preferred embodiment, there is provided a detection device which detects the trailing edge of a sheet transported on the further transport device and, upon detection of the trailing edge, transmits a signal to the processor device for controlling the arc gap. This makes it possible by means of the processor device to calculate a mean feed rate, which is then passed to the feed drive as the speed setpoint. This setpoint is determined by the processor device so that the feed device works as smoothly as possible.

Die Vorschubgeschwindigkeit kann bei einer weiteren Ausführungsform durch die Prozessoreinrichtung auch mittels der Taktfolgen des Doppelbogensensors berechnet werden. Der Bogenstapel läuft hierbei zunächst schnell, je nach Reaktionsverhalten kann dann eine kontinuierliche Geschwindigkeit eingeregelt werden.In a further embodiment, the feed rate can also be calculated by the processor device by means of the clock sequences of the double-sheet sensor. The sheet stack runs here initially fast, depending on the reaction behavior then a continuous speed can be adjusted.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnungen näher erläutert. Es zeigen:

Figur 1
schematisch einen bekannten Rundstapelbogenanleger,
Figur 2
den Rundstapelbogenanleger von Figur 1 im Bereich einer Vereinzelungseinrichtung im vergrößerten Maßstab,
Figur 3
das Auftreffen von Bogen mit nach oben gebogener Vorderkante auf eine eine Wippe umfassende Erfassungseinrichtung der Vereinzelungseinrichtung von Figur 2,
Figur 4
das Auftreffen von Bogen mit nach unten gebogener Vorderkante auf die Erfassungseinrichtung der Vereinzelungseinrichtung von Figur 2,
Figur 5
eine Vereinzelungseinrichtung eines erfindungsgemäßen Rundstapelbogenanlegers,
Figur 6
die Steuerung einer Vorschubgeschwindigkeit des erfindungsgemäßen Rundstapelbogenanlegers.
An embodiment of the invention will be explained below with reference to the drawings. Show it:
FIG. 1
schematically a known Rundstapelbogenanleger,
FIG. 2
the round pile feeder of FIG. 1 in the area of a singulator on an enlarged scale,
FIG. 3
the impact of sheets with upwardly bent leading edge on a rocker comprehensive detection means of the singler of FIG. 2 .
FIG. 4
the impact of sheets with bent down front edge on the detection device of the singler of FIG. 2 .
FIG. 5
a separating device of a round pile sheet feeder according to the invention,
FIG. 6
the control of a feed rate of the Rundstapelbogenanlegers invention.

Der erfindungsgemäße Rundstapelbogenanleger ist im Wesentlichen so aufgebaut wie der anhand von Figur 1 beschriebene Rundstapelbogenanleger 10. Ein wesentlicher Unterschied besteht darin, dass anstatt der Wippe 32 ein von einem Lichtvorhang gebildeter Lichttaster 52 an der Übergabestelle 21 unterhalb der Förderebene an der Übergabestelle 21 angeordnet ist, der den Abstand der Vorderkante eines stromabwärtigsten Bogens 42 eines von der Vorschubeinrichtung 20 beförderten Bogenstapels 18 von der Übergabestelle 21 erfasst. Der Lichttaster 52 ist ein Analogsensor, der abhängig von der Abdeckung durch den Bogen 42 einen Spannungswert an eine Prozessoreinrichtung 50 weitergibt, der vorzugsweise zwischen 0 und 10 Volt liegt. Die Ausgangsspannung von 10 Volt wird weitergegeben, wenn sich kein Bogen 42 oberhalb des Lichttasters 52 befindet. Die Ausgangsspannung 0 wird weitergegeben, wenn der Lichttaster 52 vollkommen von dem Bogen 42 abgedeckt wird. Anhand der Spannungswerte regelt die Prozessoreinrichtung 52 die Vorschubgeschwindigkeit der Vorschubeinrichtung 20, wie es in Fig. 6 gezeigt ist. Wenn sich kein Bogen über dem Lichttaster 52 befindet (Ausgangsspannung = 10V) ist die Vorschubgeschwindigkeit maximal (Vmax). Bei Weitergabe einer Ausgangsspannung 0 wird die Vorschubeinrichtung 20 angehalten. Zu diesem Zeitpunkt befindet sich die Vorderkante des stromabwärtigsten Bogens 42 an der Übergabestelle 21. Das Saugventil 28 des Saugrades 26 wird von der Prozessoreinrichtung 50 aktiviert, so dass der stromabwärtigste Bogen 42 von dem Saugrad 26 angezogen und auf der Weitertransportvorrichtung 24 abgelegt wird. Neben dem Lichttaster 52 ist unterhalb der Übergabestelle 21 ein Ultraschall-Doppelbogensensor 54 vorgesehen. Dieser Ultraschall-Doppelbogensensor 54 strahlt von unten einen Ultraschallimpuls aus, der die Bogen zu Schwingungen anregt. Diese Schwingungen bewirken die Ausbreitung einer sehr kleinen Schallwelle auf der anderen Seite des Bogens, die von einem gegenüberliegenden Ultraschallempfänger 56 ausgewertet wird. Bei übereinanderliegenden Bogen (Doppelbogen) ist das Signal so abgeschwächt, dass es kaum noch zum Empfang gelangt. Der Ultraschall-Doppelbogensensor 54 kann erkennen, ob kein Bogen, ein Bogen, oder mehr als ein Bogen an der Übergabestelle 21 liegen. Sobald der Ultraschall-Doppelbogensensor 54 erkennt, dass mehr als ein Bogen an der Übergabestelle 21 liegt, sendet er ein entsprechendes Signal an die Prozessoreinrichtung 50, die dann den Vorschub des Förderbandes 20 stoppt und ein Alarmsignal für die Bedienungsperson ausgibt. Hierdurch wird verhindert, dass übereinanderliegende Bogen auf der Weitertransporteinrichtung 24 abgelegt werden.The Rundstapelbogenanleger invention is essentially constructed as the basis of FIG. 1 A significant difference is that instead of the rocker 32, a light sensor 52 formed by a light curtain is arranged at the transfer point 21 below the conveying plane at the transfer point 21, the distance of the leading edge of a downstream bow 42 of the feed device 20th conveyed sheet stack 18 detected by the transfer point 21. The light sensor 52 is an analog sensor which, depending on the coverage by the arc 42, passes a voltage value to a processor device 50, which is preferably between 0 and 10 volts. The output voltage of 10 volts is passed when no arc 42 is above the light scanner 52. The output voltage 0 is passed when the light scanner 52 is completely covered by the sheet 42. On the basis of the voltage values, the processor device 52 controls the feed rate of the feed device 20, as shown in FIG Fig. 6 is shown. If there is no arc above the light scanner 52 (output voltage = 10V), the feed rate is maximum (Vmax). When passing an output voltage 0, the feed device 20 is stopped. At this time, the leading edge of the downstreammost arc 42 is at the transfer point 21. The suction valve 28 of the suction wheel 26 is activated by the processor device 50, so that the most downstream sheet 42 is attracted by the suction wheel 26 and deposited on the further transport device 24. In addition to the light scanner 52, an ultrasonic double-arc sensor 54 is provided below the transfer point 21. This ultrasonic double-arc sensor 54 radiates from below an ultrasonic pulse, which excites the arc to vibrations. These vibrations cause the propagation of a very small sound wave on the other side of the sheet, which is evaluated by an opposite ultrasonic receiver 56. In the case of overlapping sheets (double sheet), the signal is attenuated so that it barely reaches the reception. The ultrasonic double-sheet sensor 54 can detect whether there is no sheet, one sheet, or more than one sheet at the transfer point 21. As soon as the ultrasonic double-sheet sensor 54 detects that more than one sheet is at the transfer point 21, it sends a corresponding signal to the processor device 50, which then stops the feed of the conveyor belt 20 and outputs an alarm signal to the operator. hereby is prevented that superimposed sheets are placed on the further transport device 24.

Claims (5)

  1. A circular stack sheet feeder with an upper table (12) and a lower table (14), which are arranged one above the other and between which a turning device (16) is provided which turns a sheet stack (18) conveyed to the upper table (12) and deposits it on to the lower table (14), on which the sheet stack (18) is conveyed by a feed device (20) to a separating device (22) which is arranged at a transfer point (21) and which deposits the most downstream sheet (42) on to a transfer apparatus (24),
    characterised in that
    a contactless detecting device (52) is provided for the contactless detection of the distance from the transfer point (21) of the sheet front edge of a most downstream sheet (42) conveyed on the lower table (14),
    the detecting device (52) is in communication with a central processor device (50) which controls the feed rate of the feed device (20) as a function of a detection value of the detecting device (52) corresponding to the distance of the most downstream sheet (42) from the transfer point (21), and which activates a suction device (26) when the sheet front edge of the most downstream sheet (42) is situated at the transfer point (21).
  2. A circular stack sheet feeder according to Claim 1, characterised in that the detecting device (52) is formed by a reflective sensor which transmits as a detection value a voltage, which is dependent on the coverage by the most downstream sheet (42), to the processor device (50) for controlling the feed rate.
  3. A circular stack sheet feeder according to Claim 1, characterised in that the detecting device (52) is formed by a reflective sensor which transmits as a detection value a current value which is dependent on the coverage by the most downstream sheet (42), a serial data interface or a parallel interface, to the processor device (50) for controlling the feed rate.
  4. A circular stack sheet feeder according to Claim 1, characterised in that a double sheet sensor (54) is provided at the transfer point so that, upon detection of a double sheet, it transmits a corresponding signal to the processor device (50) to switch off the feed device (20).
  5. A circular stack sheet feeder according to any one of the preceding Claims, characterised in that a detecting device (30) is provided which detects the rear edge of a sheet (44) conveyed on the transfer apparatus and which, upon detection of the rear edge of the sheet (44) transmits a signal to the processor device (50) to control the sheet spacing.-
EP05005501A 2004-04-21 2005-03-14 Feeding device for a stack of sheets along a curved path Expired - Lifetime EP1588964B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202004006285U 2004-04-21
DE202004006285U DE202004006285U1 (en) 2004-04-21 2004-04-21 Round pile sheet feeder

Publications (2)

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EP1588964A1 EP1588964A1 (en) 2005-10-26
EP1588964B1 true EP1588964B1 (en) 2008-10-29

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EP (1) EP1588964B1 (en)
CN (1) CN1689947B (en)
DE (2) DE202004006285U1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005026200A1 (en) 2005-06-07 2006-12-21 Pepperl + Fuchs Gmbh Detection and device for the detection of recording media
DE102011011322A1 (en) * 2011-02-16 2012-08-16 Heidelberger Druckmaschinen Ag Feeder for printing machine and method for operating such

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5333184B2 (en) * 1975-02-07 1978-09-12
DD214110A1 (en) * 1983-03-23 1984-10-03 Polygraph Leipzig DEVICE FOR REGULATING STACKING TRANSPORT TO ROUND STACKER INSTALLERS
DD267476A1 (en) * 1987-11-30 1989-05-03 Polygraph Leipzig ADJUSTING DEVICE FOR TESTS
DE4013082A1 (en) * 1990-04-25 1991-10-31 Gremser Masch Franz Overlapping sheet stream feed - uses detector for sheet stack front edge to activate intermittent conveying device
DE4431934B4 (en) * 1994-09-08 2006-04-27 Heidelberger Druckmaschinen Ag Non-contact double sheet control device
US6173950B1 (en) * 1999-05-10 2001-01-16 Gbr Systems Corporation Sheet feeding mechanism

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DE202004006285U1 (en) 2004-07-15
DE502005005774D1 (en) 2008-12-11
CN1689947A (en) 2005-11-02
EP1588964A1 (en) 2005-10-26
CN1689947B (en) 2010-04-28

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