EP0110136A2 - Device for sensing the stack height of the feed table in a printing press - Google Patents

Device for sensing the stack height of the feed table in a printing press Download PDF

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Publication number
EP0110136A2
EP0110136A2 EP83110718A EP83110718A EP0110136A2 EP 0110136 A2 EP0110136 A2 EP 0110136A2 EP 83110718 A EP83110718 A EP 83110718A EP 83110718 A EP83110718 A EP 83110718A EP 0110136 A2 EP0110136 A2 EP 0110136A2
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EP
European Patent Office
Prior art keywords
stack
paper
scanning
rod
printing press
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.)
Withdrawn
Application number
EP83110718A
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German (de)
French (fr)
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EP0110136A3 (en
Inventor
Harry Bracke
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.)
Rotaprint GmbH
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Rotaprint GmbH
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Filing date
Publication date
Application filed by Rotaprint GmbH filed Critical Rotaprint GmbH
Publication of EP0110136A2 publication Critical patent/EP0110136A2/en
Publication of EP0110136A3 publication Critical patent/EP0110136A3/en
Withdrawn legal-status Critical Current

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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
    • 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
    • B65H1/18—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 controlled by height of pile

Definitions

  • the present invention relates to a device for scanning the stack height of a paper stacking table, which can be adjusted by an electric motor, of a customary printing machine according to the preamble of patent claim 1.
  • the top of the stack succeeds to steer sufficiently precisely in the required position.
  • a reciprocating suction roller with a relatively generously dimensioned suction air the position fluctuations of the top of the paper stack are compensated for by the generously dimensioned suction air, so that usually no difficulties arise.
  • the exact setting of the top of the paper stack becomes particularly critical.
  • the proximity switch is attached to the machine frame via a position-adjustable slide guide so that the target position of the top of the paper stack can be adjusted.
  • the features of claim 4 ensure that the scanning rod does not follow the movement of the table as far as required when the stacking table is being shut down, for example for refilling paper.
  • the scanning rod can be swung up together with the holding frame to expose the top of the stack.
  • the paper stack the upper side of which is to be adjusted by the exact tracking of the stacking table, which is not shown in any more detail, is indicated by reference number 2.
  • a stacking rail 4 On its front side (on the right in the drawing), a stacking rail 4 is shown, on which the paper stack is aligned.
  • a blowing air nozzle 6 used to support the separating device is also indicated at this point.
  • a scanning rod 8 extends in the direction of the sheet removal to the right, which is arranged closely above the sheet stack and thus can possibly hold down because of the blown air, the uppermost sheet that arches upward.
  • the scanning rod 8 is connected to a swivel axis 10 extending transversely thereto, which is pivotally mounted laterally in the machine frame of the printing press, not shown.
  • This pivot axis 10 is made with a radially projecting lever or extension 12 from a suitable material and serves the purpose to activate inductive proximity switch 14 when a descent of the scanning rod 8 moves the lever 12 in the direction of the proximity switch 14.
  • a slide guide 18, which can be actuated via an eccentric 16, is provided to adjust the proximity switch 14 relative to the lever 12.
  • a support f20 which can be displaced along the rod and which is axially displaceable on the scanning rod so that the scanning can always be adjusted to the rear edge of the paper stack depending on the paper format used.
  • This support is otherwise provided on its top with a downwardly open, U-shaped bracket 22, which is penetrated by a transverse support rod 24 which is arranged axially displaceably on a holding frame 21 in the direction of the scanning rod 8.
  • the holding frame 21, which is arranged parallel to the stack surface in its normal working position and can also be pivoted upwards with the scanning rod 8 in order to provide free access to the top of the stack if necessary, prevents the scanning rod 8 by the action of the bracket 22 and the holding rod 24 remember to follow this movement as far as possible when lowering the stacking table for refilling or the like, which would then only have a disruptive effect.
  • the rear stack limit 22 provided at both corners of the stack is adjusted at the same time, which ensures that the upper part of the stack is immobilized as much as possible.

Abstract

The invention relates to a device for sensing the stack height of a paper stacking table, which can be adjusted by an electric motor, of a conventional printing press, on which table the sheets are removed at the front edge of the stack by means of a suction roll in concert with a blowing device and fed to the printing press. The sensing of the top of the paper stack is intended to be carried out in a particularly precise manner, that is to say without any disturbance variables, such as the fluttering of the suction-removal device or the blowing air used at the front edge of the paper stack, having a disadvantageous effect on the measured result. For this purpose, it is provided according to the invention that a stack height sensing rod is provided which bears against the centre of the rear edge of the paper stack and in the paper removal direction extends closely above the top of the stack to a pivoting shaft which is arranged transversely thereto and mounted in the machine frame, the pivoting position of which can be detected by means of a sensor arranged on the machine frame. <IMAGE>

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zum Abtasten der Stapelhöhe eines elektromotorisch nachführbaren Papierstapeltisches einer üblichen Druckmaschine nach dem Oberbegriff des Patentanspruches 1.The present invention relates to a device for scanning the stack height of a paper stacking table, which can be adjusted by an electric motor, of a customary printing machine according to the preamble of patent claim 1.

Es ist bekannt, den Papierstapeltisch von Druckmaschinen mit Hilfe von mechanisch oder elektromotorisch angetriebenen Vorrichtungen nachzuführen, um in Anpassung an den abnehmenden Papiervorrat die Oberseite des Papierstapels im wesentlichen in einer gleichbleibenden Lage zu halten.It is known to track the paper stacking table of printing machines with the aid of mechanically or electromotively driven devices in order to keep the top of the paper stack in a substantially constant position in adaptation to the decreasing paper supply.

Mit den bekannten Druckmaschinen und den dabei verwendeten Vereinzelungsvorrichtungen gelingt es, die Stapeloberseite ausreichend genau in der benötigten Lage einzusteuern. Bei Verwendung einer hin- und hergehenden Saugwalze mit relativ großzügig bemessener Saugluft werden die Lageschwankungen der Oberseite des Papierstapels von der großzügig bemessenen Saugluft ausgeglichen, so daß üblicherweise keine Schwierigkeiten entstehen. Wenn aber aufgrund von konstruktiven Gegebenheiten der Druckmaschine nur eine beschränkte Menge an Saugluft zur Verfügung steht, etwa weil auf bisher übliche Vorrichtungen zur Erzeugung der Saugluft verzichtet werden soll, wird die genaue Einstellung der Oberseite des Papierstapels besonders kritisch.With the known printing presses and the separating devices used, the top of the stack succeeds to steer sufficiently precisely in the required position. When using a reciprocating suction roller with a relatively generously dimensioned suction air, the position fluctuations of the top of the paper stack are compensated for by the generously dimensioned suction air, so that usually no difficulties arise. However, if only a limited amount of suction air is available due to the design of the printing press, for example because previously customary devices for generating the suction air are to be dispensed with, the exact setting of the top of the paper stack becomes particularly critical.

Es ist also die der vorliegenden Erfindung zugrundeliegende Aufgabe, die Abtastung der Oberseite des Papierstapels besonders genau auszuführen, ohne irgendwelche Störgrößen wie das Hin- und Herschwingen des Entnahmesaugers oder die an der Vorderkante des Papierstapels benutzte Blasluft sich auf das Meßergebnis nachteilig auswirken zu lassen.It is therefore the object of the present invention to carry out the scanning of the top of the paper stack particularly precisely without having any disturbing variables such as the back and forth swinging of the extraction suction device or the blown air used on the front edge of the paper stack adversely affect the measurement result.

Diese Aufgabe wird erfindungsgemäß durch die Lehren des Patentanspruches 1 gelöst. Es wurde herausgefunden, daß nur durch diese besondere Positionierung der Abtastvorrichtung im Zusammenhang mit der Anordnung der Abtaststange dicht oberhalb der Stapel-Oberseite ein zufriedenstellendes Meßergebnis erreicht wird. Anstatt die Abtastung in demjenigen Bereich durchzuführen, wo die fehlerhafte Lage des Papierstapels sich tatsächlich auswirkt, nämlich an der vorderen Kante bzw. im Bereich der Saugwalze, wird die Abtastung an einer von dort möglichst weit entfernten Stelle vorgenommen. Durch diese Art der Abtastung der Oberfläche des Papierstapels in Verbindung mit der besonderen Anordnung der Abtaststange und des Meßwertgebers zur Feststellung der Winkelstellung der mit der Abtaststange verbundenen Schwenkachse gelingt es, den Stapeltisch mit Hilfe von einfachen Elektromotoren mit der erforderlichen Genauigkeit einzustellen.This object is achieved by the teachings of claim 1. It was found that only by this special positioning of the scanning device in connection with the arrangement of the scanning rod just above the top of the stack, a satisfactory measurement result can be achieved. Instead of carrying out the scan in the area where the incorrect position of the paper stack actually has an effect, namely on the front edge or in the area of the suction roll, the scanning is carried out at a point as far away as possible from there. This type of scanning of the surface of the paper stack in connection with the special arrangement of the scanning rod and the sensor for determining the angular position of the pivot axis connected to the scanning rod makes it possible to set the stacking table with the required accuracy with the aid of simple electric motors.

Der Näherungsschalter ist über eine lageverschiebliche Schlittenführung an dem Maschinengestell befestigt, um so die Solllage der Papierstapel-Oberseite justieren zu können.The proximity switch is attached to the machine frame via a position-adjustable slide guide so that the target position of the top of the paper stack can be adjusted.

Durch die Merkmale des Anspruchs 4 wird erreicht, daß die Abtaststange beim Herunterfahren des Stapeltisches, etwa zum Nachfüllen von Papier, der Bewegung des Tisches nicht beliebig weit folgt. Außerdem kann die Abtaststange zusammen mit dem Halterahmen nach oben weggeschwenkt werden, um die Stapeloberseite freizulegen.The features of claim 4 ensure that the scanning rod does not follow the movement of the table as far as required when the stacking table is being shut down, for example for refilling paper. In addition, the scanning rod can be swung up together with the holding frame to expose the top of the stack.

Ein Ausführungsbeispiel der erfindungsgemäßen Vorrichtung wird im nachfolgenden unter Bezugnahme auf die beigefügte Zeichnung beschrieben. Sie zeigt das erfindungsgemäße Prinzip in schematischer Darstellung, wobei konstruktive Einzelheiten zum Zwecke der Klarheit fortgelassen sind.An embodiment of the device according to the invention is described below with reference to the accompanying drawings. It shows the principle according to the invention in a schematic representation, structural details being omitted for the purpose of clarity.

Der Papierstapel, dessen Oberseite durch die genaue Nachführung des nicht näher gezeigten Stapeltisches eingestellt werden soll, wird durch das Bezugszeichen 2 angedeutet. An seiner Vorderseite (in der Zeichnung rechts) ist eine Stapelschiene 4 gezeigt, an der der Papierstapel ausgerichtet wird. Eine zur Unterstützung der Vereinzelungsvorrichtung verwendete Blasluftdüse 6 ist an dieser Stelle ebenfalls angedeutet.The paper stack, the upper side of which is to be adjusted by the exact tracking of the stacking table, which is not shown in any more detail, is indicated by reference number 2. On its front side (on the right in the drawing), a stacking rail 4 is shown, on which the paper stack is aligned. A blowing air nozzle 6 used to support the separating device is also indicated at this point.

Der jeweils oberste Bogen des Papierstapels wird durch eine hin- und herschwingende Saugwalze an der Vorderseite des Papierstapels in üblicher Weise abgenommen, wobei jedoch relativ wenig Saugluft zur Verfügung steht, wie dies einleitend angedeutet wurde. In der Mitte des Papierstapels erstreckt sich in Richtung der nach rechts erfolgenden Bogenentnahme eine Abtaststange 8, die dicht über dem Bogenstapel angeordnet ist und somit die sich möglicherweise aufgrund der Blasluft nach oben wölbenden obersten Bogen niederhalten kann. Die Abtaststange 8 ist mit einer quer dazu verlaufenden Schwenkachse 10 verbunden, die seitlich im nicht näher dargestellten Maschinengestell der Druckmaschine schwenkbar gelagert ist. Diese Schwenkachse 10 ist mit einem radial vorspringenden Hebel oder Ansatz 12 aus geeignetem Material hergestellt und dient dazu, den induktiven Näherungsschalter 14 zu aktivieren, wenn ein Absinken der Abtaststange 8 den Hebel 12 in Richtung auf den Näherungsschalter 14 verschiebt.The uppermost sheet of the paper stack is removed in the usual way by a back-and-forth suction roller on the front of the paper stack, but relatively little suction air is available, as was indicated above. In the middle of the paper stack, a scanning rod 8 extends in the direction of the sheet removal to the right, which is arranged closely above the sheet stack and thus can possibly hold down because of the blown air, the uppermost sheet that arches upward. The scanning rod 8 is connected to a swivel axis 10 extending transversely thereto, which is pivotally mounted laterally in the machine frame of the printing press, not shown. This pivot axis 10 is made with a radially projecting lever or extension 12 from a suitable material and serves the purpose to activate inductive proximity switch 14 when a descent of the scanning rod 8 moves the lever 12 in the direction of the proximity switch 14.

Um die Sollage der Stapeloberseite genau einstellen zu können, ist eine über einen Exzenter 16 betätigbare Schlittenführung 18 dazu vorgesehen, den Näherungsschalter 14 relativ zum Hebel 12 zu verstellen.In order to be able to set the desired position of the top of the stack precisely, a slide guide 18, which can be actuated via an eccentric 16, is provided to adjust the proximity switch 14 relative to the lever 12.

An dem am rückwärtigen Ende des Papierstapels 2 aufliegenden Ende der Abtaststange 8 ist ein längs der Stange verschiebliches Auflagef20 vorgesehen, welches auf der Abtaststange axial verschieblich ist, um die Abtastung je nach verwendetem Papierformat immer auf die Hinterkante des Papierstapels einstellen zu können. Dieses Auflager ist im übrigen an seiner Oberseite mit einem nach unten offenen, U-förmigen Bügel 22 versehen, welcher von einer querverlaufenden Haltestange 24 durchsetzt wird, die an einem Halterahmen 21 in Richtung der Abtaststange 8 axial verschieblich angeordnet ist. Der Halterahmen 21, der in seiner normalen Arbeitslage parallel zur Stapeloberfläche angeordnet und im übrigen mit der Abtaststange 8 nach oben wegschwenkbar ist, um bei Bedarf einen freien Zugang zur Stapeloberseite zu schaffen, hindert die Abtaststange 8 durch die Wirkung des Bügels 22 und der Haltestange 24 daran, beim Herunterfahren des Stapeltisches zum Nachfüllen oder dgl. dieser Bewegung beliebig weit zu folgen, was sich dann nur störend auswirken würde.At the end of the scanning rod 8 resting on the rear end of the paper stack 2 there is provided a support f20 which can be displaced along the rod and which is axially displaceable on the scanning rod so that the scanning can always be adjusted to the rear edge of the paper stack depending on the paper format used. This support is otherwise provided on its top with a downwardly open, U-shaped bracket 22, which is penetrated by a transverse support rod 24 which is arranged axially displaceably on a holding frame 21 in the direction of the scanning rod 8. The holding frame 21, which is arranged parallel to the stack surface in its normal working position and can also be pivoted upwards with the scanning rod 8 in order to provide free access to the top of the stack if necessary, prevents the scanning rod 8 by the action of the bracket 22 and the holding rod 24 remember to follow this movement as far as possible when lowering the stacking table for refilling or the like, which would then only have a disruptive effect.

Beim Verschieben des Auflagers 20 zur Einstellung desselben wird im übrigen gleichzeitig die an beiden Ecken des Stapels vorgesehene hintere Stapelbegrenzung 22 verstellt, die dafür sorgt, daß auch der obere Teil des Stapels möglichst ruhiggestellt wird.When moving the support 20 to adjust the same, the rear stack limit 22 provided at both corners of the stack is adjusted at the same time, which ensures that the upper part of the stack is immobilized as much as possible.

Durch die besondere Ausbildung und Anordnung der Abtastvorrichtung im Verhältnis zu der Stapeloberseite wird ein besonders gutes Meßergebnis erreicht, welches für die genaue Nachführung des Stapeltisches unerläßlich ist.Due to the special design and arrangement of the scanning device in relation to the top of the stack, a particularly good measurement result is achieved, which is essential for the exact tracking of the stacking table.

Claims (4)

1. Vorrichtung zum Abtasten der Stapelhöhe eines elektromotorisch nachführbaren Papierstapeltisches einer üblichen Druckmaschine, an dem an der Stapelvorderkante die Bogen durch eine Saugwalze in Zusammenarbeit mit einer Blasvorrichtung entnommen und der Druckmaschine zugeführt werden, dadurch gekennzeichnet,
daß in der Mitte der hinteren Kante des Papierstapels (2) eine dort aufliegende Stapelhöhen-Abtaststange (8) vorgesehen ist, die in der Papierabzugsrichtung verlaufend sich dicht oberhalb der Stapeloberseite bis zu einer quer dazu angeordneten, im Maschinengestell gelagerten Schwenkachse (10) erstreckt,deren Schwenkstellung über einen am Maschinengestell angeordneten Meßwertgeber (14) feststellbar ist.1. Device for scanning the stack height of a paper stacking table, which can be adjusted by an electric motor, of a conventional printing press, on which the sheets are removed from the stack front edge by a suction roller in cooperation with a blowing device and fed to the printing press, characterized in that
that in the middle of the rear edge of the paper stack (2) there lies a stack height sensing rod (8) is provided, which extends in the paper withdrawal direction, just above the top of the stack, up to a swivel axis (10), which is arranged transversely thereto and is mounted in the machine frame, the swivel position of which can be determined by a sensor (14) arranged on the machine frame. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Abtaststange (8) sich mindestens über 3/4 der Länge des Stapeltisches erstreckt.2. Device according to claim 1, characterized in that the scanning rod (8) extends at least 3/4 of the length of the stacking table. 3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Abtaststange (8) sich über ein auf ihr axial verschiebliches Auflager (20) auf demPapierstapel (20) abstützt, welches mit einem senkrecht zur Abtaststange (8) verlaufenden, nach unten offenen U-förmigen Bügel (22) versehen ist, und daß im Maschinengestell ein oberhalb der Papierstapel-Oberseite verlaufender, parallel dazu angeordneter und nach oben verschwenkbarer Halterahmen (21) angeordnet ist, der eine quer zur Abtaststange (8) verlaufende, in Richtung der Abtaststange verschiebliche Haltestange (24) trägt, die den Bügel (22) durchsetzt.3. Apparatus according to claim 1 or 2, characterized in that the scanning rod (8) is supported on the paper stack (20) via an axially displaceable support (20) which is open at the bottom with a perpendicular to the scanning rod (8) U-shaped bracket (22) is provided, and that in the machine frame is arranged above the top of the paper stack, parallel to it and pivotable upward holding frame (21) is arranged, which extends transversely to the scanning rod (8) in the direction of the scanning rod Slidable support rod (24) carries through the bracket (22). 4. Vorrichtung nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß der Meßwertgeber ein induktiver Näherungsschalter (14) ist, der an einer Schlittenführung (18) befestigt ist, die über einen Exzenter (16) lageverschieblich ist, wobei der Näherungsschalter die Position eines an der Schwenkachse (10) befestigten radialen Hebelarms (12) feststellt.4. Device according to one of the preceding claims, characterized in that the transmitter is an inductive Proximity switch (14) which is fastened to a slide guide (18) which can be displaced in position via an eccentric (16), the proximity switch determining the position of a radial lever arm (12) fastened to the swivel axis (10).
EP83110718A 1982-10-26 1983-10-26 Device for sensing the stack height of the feed table in a printing press Withdrawn EP0110136A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3239581 1982-10-26
DE19823239581 DE3239581A1 (en) 1982-10-26 1982-10-26 DEVICE FOR SCANING THE PACKAGE HEIGHT OF AN ELECTROMOTORALLY REPLACABLE PAPER PACK OF A COMMON PRINTING MACHINE

Publications (2)

Publication Number Publication Date
EP0110136A2 true EP0110136A2 (en) 1984-06-13
EP0110136A3 EP0110136A3 (en) 1985-05-22

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Application Number Title Priority Date Filing Date
EP83110718A Withdrawn EP0110136A3 (en) 1982-10-26 1983-10-26 Device for sensing the stack height of the feed table in a printing press

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EP (1) EP0110136A3 (en)
JP (1) JPS59133133A (en)
DE (1) DE3239581A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2201243B (en) * 1987-02-19 1991-09-18 Heidelberger Druckmasch Ag Sheet processing apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE660337C (en) * 1938-05-23 Paul Albert Glatz Pile lifter
FR864971A (en) * 1939-12-30 1941-05-09 Improvements to duplicators and similar machines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE660337C (en) * 1938-05-23 Paul Albert Glatz Pile lifter
FR864971A (en) * 1939-12-30 1941-05-09 Improvements to duplicators and similar machines

Also Published As

Publication number Publication date
EP0110136A3 (en) 1985-05-22
DE3239581A1 (en) 1984-04-26
JPS59133133A (en) 1984-07-31

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