EP0539773B1 - Control device for a pile lifting drive in a sheet-processing machine, particularly for sheet-printing machines - Google Patents

Control device for a pile lifting drive in a sheet-processing machine, particularly for sheet-printing machines Download PDF

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Publication number
EP0539773B1
EP0539773B1 EP92117162A EP92117162A EP0539773B1 EP 0539773 B1 EP0539773 B1 EP 0539773B1 EP 92117162 A EP92117162 A EP 92117162A EP 92117162 A EP92117162 A EP 92117162A EP 0539773 B1 EP0539773 B1 EP 0539773B1
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Prior art keywords
control device
sheet
stack
motor
printed
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EP92117162A
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German (de)
French (fr)
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EP0539773A1 (en
Inventor
Bernd Lindner
Albrecht Völz
Joachim Blumör
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Manroland AG
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MAN Roland Druckmaschinen AG
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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 invention relates to a control device for a stacking stroke drive in sheet-processing machines, in particular sheet-fed printing machines, according to the preamble of claim 1.
  • the sheets to be printed are removed from the top of a stack and, in particular, conveyed under shingled via a feed table.
  • the devices effecting the sheet removal can only securely grasp the sheets within a relatively narrow height range of the top edge of the stack in order to ensure trouble-free transport of the sheets.
  • the pallet on which the sheets are stacked is therefore provided with a stacking stroke drive, which causes the top sheet to always be within a certain height range.
  • the uppermost sheet or the top edge of the stack is detected by means of a stack height scanner.
  • the stack lifting drive for lifting the pallet is controlled by a control device.
  • the stack lifting drive can carry out continuous or discontinuous movements of the pallet during the subsequent conveying.
  • a control device for a continuously operating stack lifting drive in which the motor of the stack lifting drive always remains activated according to the deviations of the target / actual height difference determined by a stack height scanner, only executes slower or faster tracking movements.
  • the disadvantage here is that the motor and the drive upstream of it must be designed for a very large adjustment range, so that the top edge of the stack can be kept within a narrow height range at all processing speeds of the printing press and all substrate thicknesses.
  • the device for controlling a stack lifting device expands the possibilities with regard to the control of the tracking movements of the sheet stack in that a pulse generator is assigned to the motor of the stack lifting drive.
  • the size of the tracking movements is calculated in the control device from the signals of the pulse generator.
  • the control device also detects the processing speed of the printing press.
  • the described pulse generator is very complex due to the provided pulse generator.
  • the object of the present invention is thus to design a control device for a stacking stroke drive in sheet-processing machines in accordance with the preamble of claim 1 such that an expensive motor and drive for large adjustment ranges can be dispensed with.
  • a switch is made between a continuous and a discontinuous stacking stroke operation depending on the processing speed of the printing press and the substrate thickness. Switching between the two operating modes results in a control device in which a characteristic curve, which is worked out according to the setting range of the motor and the drive, is stored.
  • the characteristic curve separates the areas with continuous and discontinuous stacking stroke operation from each other in a plane formed by the axes processing speed of the printing press and the substrate thickness.
  • the invention thus makes it possible to dispense with a high-quality and expensive motor and drive (large adjustment range). Nevertheless, the advantages of continuous stacking can be used at high processing speeds and large substrate thicknesses.
  • the sheets to be printed on a printing press 11 lie in the form of a stack 1 on a pallet 2 (FIG. 1).
  • a lifting gear 3 is indicated, through which the pallet 2 and thus the stack 1 can be lifted.
  • the lifting gear 3 is driven by a motor 4, which is additionally associated with an electromagnetically controllable brake 5.
  • the task of brake 5 is to keep the stack 1 against its weight at a certain height when the motor 4 is not activated.
  • Brake 5 can also be integrated directly in the motor 4 in the form of a lifting armature motor and can be switched either by pulses from the control device 8 or inevitably by the motor current.
  • Motor 4 is supplied with voltage by a speed controller 6 in order to achieve a predeterminable speed.
  • motor 4 is designed as a three-phase asynchronous motor, with a speed controller 6 having a small adjustment range being assigned to it.
  • Speed controller 6 takes the voltage on the input side directly from the mains.
  • the upper edge of stack 1 is detected by a stack height scanner 7, the output signal of which can be seen whether the upper edge of stack 1 is within or outside a certain height range.
  • the output of the stack height scanner 7 is connected to the control device 8, in which the corresponding control signals for the speed controller 6 are formed.
  • the control device 8 is supplied with the processing speed of the printing press 11 shown symbolically here.
  • the processing speed can be a tachometer signal from the main drive or a pulse sequence of speed-dependent frequency.
  • the substrate thickness can also be supplied to the control device 8, which, as indicated in FIG. 1, can be done via manual data input, in particular via a control center computer 9, from which the entire printing press 11 can be monitored and operated.
  • the control device 8 is now designed to switch the speed controller 6 between continuous and discontinuous operation depending on the processing speed of the printing press 11 and the printing material thickness entered via the control center computer 9.
  • the control device 8 specifies a speed setpoint to the speed controller 6 in such a way that the upper edge of stack 1 is always within a height range controlled by the stack height scanner 7.
  • the speed setpoint is calculated from the processing speed of the printing press 11 and the substrate thickness, the translation of the lifting gear 3 being taken into account.
  • the output signals from the stack height scanner 7 are monitored in the control device 8 for compliance with a target height of the top edge of the stack. If the setpoint height is exceeded and undershot, the calculated setpoint speed values are passed on to the speed controller 6 with additional corrections by the control device 8.
  • control device 8 In the case of discontinuous operation, control device 8 only monitors whether the upper edge of stack 1 is exceeded or undershot, which is determined by stack height scanner 7. If the height falls below, the control device 8 causes the stack 1 to be raised via the speed controller 6 until, for example, an upper limit is reached. After a certain time, i.e. after a certain number of sheets removed, control device 8 again causes stack 1 to be lifted.
  • the control device 8 switches over between continuous and discontinuous stacking stroke operation on the basis of a comparison of the current processing speed of the printing press 11 and the previously entered printing material thickness.
  • the control device 8 is operatively connected to a characteristic curve memory 10 in that a characteristic curve is stored.
  • 2 shows a quantitative example of the stored characteristic curve which lies in a plane formed by the axis of the processing speed V of the machine with the printing material thickness B.
  • D denotes the area of discontinuous and K the area of continuous stacking operation.
  • the characteristic curve memory 10 thus contains the processing speed V for a large number of printing material strengths B, at which it is necessary to switch between continuous and discontinuous operation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Pile Receivers (AREA)
  • Handling Of Cut Paper (AREA)
  • Controlling Sheets Or Webs (AREA)

Description

Die Erfindung betrifft eine Steuervorrichtung für einen Stapelhubantrieb bei bogenverarbeitenden Maschinen, insbesondere Bogendruckmaschinen, gemäß dem Oberbegriff von Anspruch 1.The invention relates to a control device for a stacking stroke drive in sheet-processing machines, in particular sheet-fed printing machines, according to the preamble of claim 1.

Bei Bogendruckmaschinen werden die zu verdruckenden Bogen der Oberseite eines Stapels entnommen und über einen Anlagetisch insbesondere unterschuppt abgefördert. Die die Bogenentnahme bewirkenden Einrichtungen (Hubsauger) können die Bogen dabei nur innerhalb eines relativ engen Höhenbereichs der Stapeloberkante sicher erfassen um einen störungsfreien Weitertransport der Bogen zu gewährleisten. Die Palette, auf welche die Bogen aufgestapelt sind, ist daher mit einem Stapelhubantrieb versehen, der bewirkt, daß der oberste Bogen sich stets innerhalb eines bestimmten Höhenbereiches befindet. Der oberste Bogen bzw. die Stapeloberkante wird dabei mittels eines Stapelhöhenabtasters erfaßt. Entsprechend den Ausgangssignalen dieses Stapelhöhenabtasters wird über eine Steuervorrichtung der Stapelhubantrieb zum Anheben der Palette angesteuert. Der Stapelhubantrieb kann dabei kontinuierliche oder diskontinuierliche Bewegungen der Palette beim Nachfördern ausführen.In sheet-fed printing machines, the sheets to be printed are removed from the top of a stack and, in particular, conveyed under shingled via a feed table. The devices effecting the sheet removal (lifting suction devices) can only securely grasp the sheets within a relatively narrow height range of the top edge of the stack in order to ensure trouble-free transport of the sheets. The pallet on which the sheets are stacked is therefore provided with a stacking stroke drive, which causes the top sheet to always be within a certain height range. The uppermost sheet or the top edge of the stack is detected by means of a stack height scanner. According to the output signals of this stack height scanner, the stack lifting drive for lifting the pallet is controlled by a control device. The stack lifting drive can carry out continuous or discontinuous movements of the pallet during the subsequent conveying.

Aus der DE 3 607 979 A1 ist eine Steuervorrichtung für einen kontinuierlich arbeitenden Stapelhubantrieb bekannt, bei welchem der Motor des Stapelhubantriebs immer angesteuert bleibt und entsprechend den Abweichungen der durch einen Stapelhöhenabtaster festgestellten Soll-/Ist-Höhendifferenz lediglich langsamere oder schnellere Nachführbewegungen ausführt. Nachteilig ist hierbei, daß der Motor sowie der ihm vorgeschaltete Antrieb für einen sehr großen Stellbereich ausgelegt sein muß, damit bei allen Verbarbeitungsgeschwindigkeiten der Druckmaschine und allen Bedruckstoffstärken die Stapeloberkante innerhalb eines engen Höhenbereiches gehalten werden kann.From DE 3 607 979 A1 a control device for a continuously operating stack lifting drive is known, in which the motor of the stack lifting drive always remains activated according to the deviations of the target / actual height difference determined by a stack height scanner, only executes slower or faster tracking movements. The disadvantage here is that the motor and the drive upstream of it must be designed for a very large adjustment range, so that the top edge of the stack can be kept within a narrow height range at all processing speeds of the printing press and all substrate thicknesses.

Wesentlich geringere Anforderungen sind an die Antriebe nebst den Motoren von diskontinuierlich arbeitenden Stapelhubantrieben zu stellen (DE 2 659 511 C2). Entsprechend dem Ausgangssignal einer Stapelhöhenabtastung wird der Stapelhubantrieb auf Lauf bzw. auf Stop geschaltet. Bei hohen Druckgeschwindigkeiten und hohen Bedruckstoffstärken bedingt dies nicht nur eine große Schalthäufigkeit, für welche der Stapelhubantrieb ausgelegt sein muß. Die große Schalthäufigkeit wird vor allem aber über das mechanische Hubgetriebe den auf der Palette liegenden Bogenstapel in Schwingungen versetzen. Gerade bei großen Bedruckstoffstärken und somit relativ großer Bedruckstoffmasse können diese Schwingungen im Stapel die obersten abzunehmenden Bogen in eine nicht kontrollierbare Eigendynamik versetzen, so daß ein störungsfreier Weitertransport zur Anlage nicht gewährleistet ist.Significantly lower requirements are to be placed on the drives in addition to the motors of discontinuously operating stack lifting drives (DE 2 659 511 C2). The stack lifting drive is switched to run or stop in accordance with the output signal of a stack height scan. At high printing speeds and high substrate thicknesses, this does not only result in a high switching frequency for which the stacking stroke drive must be designed. The high switching frequency will, above all, cause the sheet stack lying on the pallet to vibrate via the mechanical lifting gear. Especially with large printing material thicknesses and thus a relatively large printing material mass, these vibrations in the stack can put the top sheets to be removed into an uncontrollable dynamic of their own, so that trouble-free further transport to the system is not guaranteed.

Die Einrichtung zum Steuern einer Stapelhebevorrichtung gemäß der DE 3 631 456 C2 erweitert die Möglichkeiten hinsichtlich der Steuerung der Nachführbewegungen des Bogenstapels, indem dem Motor des Stapelhubantriebs ein Impulsgeber zugeordnet ist. In der Steuereinrichtung wird aus den Signalen des Impulsgebers die Größe der Nachführbewegungen errechnet. Die Steuereinrichtung erfaßt ferner die Verarbeitungsgeschwindigkeit der Druckmaschine. Gerade durch den vorgesehenen Impulsgeber gestaltet jedoch diese beschriebene Einrichtung sich sehr aufwendig.The device for controlling a stack lifting device according to DE 3 631 456 C2 expands the possibilities with regard to the control of the tracking movements of the sheet stack in that a pulse generator is assigned to the motor of the stack lifting drive. The size of the tracking movements is calculated in the control device from the signals of the pulse generator. The control device also detects the processing speed of the printing press. However, the described pulse generator is very complex due to the provided pulse generator.

Aufgabe der vorliegenden Erfindung ist es somit, eine Steuervorrichtung für einen Stapelhubantrieb bei bogenverarbeitenden Maschinen gemäß dem Oberbegriff von Anspruch 1 derartig zu gestalten, so daß auf einem kostspieligen Motor nebst Antrieb für große Stellbereiche verzichtet werden kann.The object of the present invention is thus to design a control device for a stacking stroke drive in sheet-processing machines in accordance with the preamble of claim 1 such that an expensive motor and drive for large adjustment ranges can be dispensed with.

Die vorliegende Erfindung löst diese Aufgabe durch Anwendung der kennzeichnenden Merkmale von Anspruch 1. Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen in Verbindung mit der Beschreibung und den Zeichnungen.The present invention solves this problem by applying the characterizing features of claim 1. Further developments of the invention result from the subclaims in conjunction with the description and the drawings.

Bei der Steuervorrichtung für den Stapelhubantrieb gemäß der Erfindung wird in Abhängigkeit der Verarbeitungsgeschwindigkeit der Druckmaschine und der Bedruckstoffstärke zwischen einem kontinuierlichen und einem diskontinuierlichen Stapelhubbetrieb umgeschaltet. Das Umschalten zwischen den beiden Betriebsarten bewirkt eine Steuervorrichtung, in der eine nach dem Stellbereich von Motor nebst Antrieb ausgearbeitete Kennlinie abgespeichert ist. Die Kennlinie trennt in einer aus den Achsen Verarbeitungsgeschwindigkeit der Druckmaschine und der Bedruckstoffdicke gebildeten Ebene die Bereiche mit kontinuierlichem und diskontinuierlichem Stapelhubbetrieb voneinander.In the control device for the stacking stroke drive according to the invention, a switch is made between a continuous and a discontinuous stacking stroke operation depending on the processing speed of the printing press and the substrate thickness. Switching between the two operating modes results in a control device in which a characteristic curve, which is worked out according to the setting range of the motor and the drive, is stored. The characteristic curve separates the areas with continuous and discontinuous stacking stroke operation from each other in a plane formed by the axes processing speed of the printing press and the substrate thickness.

Da nach der Erfindung vorgesehen ist, bei großen Bedruckstoffstärken schon bei geringen Verarbeitungsgeschwindigkeiten den Stapelhubantrieb kontinuierlich zu steuern, können keine Schwingbewegungen innerhalb des Stapels auf die abzunehmenden Bogen übertragen werden. Bei geringen Bedruckstoffstärken wird bei fast allen Verarbeitungsgeschwindigkeiten diskontinuierlich gefördert, was zur Folge hat, daß vom Antriebsmotor keine sehr langsamen Bewegungen trotz gleichbleibendem Lastmoment (Gewicht des Stapels) ausgeführt werden müssen. Bei dünnen Bedruckstoffen werden auch die Schalthäufigkeit des Antriebs und somit die Schwingungen im Stapel in der Frequenz nicht so hoch. Wegen der geringen Bedruckstoffmasse erzeugen diese Schwingungen keine Störungen im Bogenlauf.Since it is provided according to the invention to continuously control the stacking stroke drive even at low processing speeds for large printing material thicknesses, no oscillating movements within the stack can be transmitted to the sheets to be removed. With low substrate thicknesses, discontinuous conveying is carried out at almost all processing speeds, which means that the drive motor does not have to perform very slow movements despite the constant load torque (weight of the stack). With thin substrates, the frequency of switching of the drive and thus the vibrations in the stack are not as high. Because of the low printing material mass, these vibrations do not cause any disruptions in sheet travel.

Die Erfindung macht es somit möglich, auf einem hochwertigen und kostspieligen Motor nebst Antrieb (großer Stellbereich) zu verzichten. Trotzdem können die Vorteile des kontinuierlichen Stapelhubbetriebes bei hohen Verarbeitungsgeschwindigkeiten und großen Bedruckstoffdicken genutzt werden.The invention thus makes it possible to dispense with a high-quality and expensive motor and drive (large adjustment range). Nevertheless, the advantages of continuous stacking can be used at high processing speeds and large substrate thicknesses.

Desweiteren erfolgt ein Ausführungsbeispiel der Erfindung anhand der Zeichnung. Es zeigt:

Fig. 1
eine Steuervorrichtung für einen Stapelhubantrieb gemäß der Erfindung,
Fig. 2
ein Kennlinienfeld.
Furthermore, an embodiment of the invention is based on the drawing. It shows:
Fig. 1
a control device for a stacking stroke drive according to the invention,
Fig. 2
a characteristic field.

Die auf einer Druckmaschine 11 zu verdruckenden Bogen liegen in Form eines Stapels 1 auf einer Palette 2 (Fig. 1). Angedeutet ist ein Hubgetriebe 3, durch welches die Palette 2 und somit der Stapel 1 gehoben werden kann. Das Hubgetriebe 3 wird von einem Motor 4 angetrieben, wobei diesem zusätzlich eine elektromagnetisch ansteuerbare Bremse 5 zugeordnet ist. Die Aufgabe von Bremse 5 ist dabei, den Stapel 1 entgegen seinem Gewicht auf einer bestimmten Höhe zu halten, wenn Motor 4 nicht angesteuert ist. Bremse 5 kann auch direkt im Motor 4 in Form eines Hubankermotors integriert sein und entweder durch Impulse von der Steuervorrichtung 8 oder zwangsläufig durch den Motorstrom geschaltet werden.The sheets to be printed on a printing press 11 lie in the form of a stack 1 on a pallet 2 (FIG. 1). A lifting gear 3 is indicated, through which the pallet 2 and thus the stack 1 can be lifted. The lifting gear 3 is driven by a motor 4, which is additionally associated with an electromagnetically controllable brake 5. The task of brake 5 is to keep the stack 1 against its weight at a certain height when the motor 4 is not activated. Brake 5 can also be integrated directly in the motor 4 in the form of a lifting armature motor and can be switched either by pulses from the control device 8 or inevitably by the motor current.

Motor 4 wird von einem Drehzahlsteller 6 zur Erzielung einer vorgebbaren Drehzahl mit Spannung versorgt. In einfacher Weise ist Motor 4 als ein Drehstrom-Asynchron-Motor ausgeführt, wobei diesem ein Drehzahlsteller 6 mit geringem Stellbereich zugeordnet ist. DerMotor 4 is supplied with voltage by a speed controller 6 in order to achieve a predeterminable speed. In a simple manner, motor 4 is designed as a three-phase asynchronous motor, with a speed controller 6 having a small adjustment range being assigned to it. The

Drehzahlsteller 6 entnimmt die Spannung eingangsseitig direkt vom Netz.Speed controller 6 takes the voltage on the input side directly from the mains.

Die Oberkante von Stapel 1 wird durch einen Stapelhöhenabtaster 7 erfaßt, dessen Ausgangssignal entnehmbar ist, ob die Oberkante von Stapel 1 innerhalb oder außerhalb eines bestimmten Höhenbereiches liegt. Der Ausgang von Stapelhöhenabtaster 7 ist dazu an die Steuervorrichtung 8 geschaltet, in welcher die entsprechenden Stellsignale für den Drehzahlsteller 6 gebildet werden. Weiterhin wird der Steuervorrichtung 8 die Verarbeitungsgeschwindigkeit der hier symbolisch dargestellten Druckmaschine 11 zugeleitet. Bei der Verarbeitungsgeschwindigkeit kann es sich dabei um ein Tachosignal des Hauptantriebes oder um eine Impulsfolge drehzahlabhängiger Frequenz handeln. Der Steuervorrichtung 8 ist ebenfalls die Bedruckstoffstärke zuführbar, was, wie in Fig. 1 angedeutet, über eine manuelle Dateneingabe insbesondere über einen Leitstandsrechner 9, von dem aus die ganze Druckmaschine 11 überwach- und bedienbar ist, geschehen kann.The upper edge of stack 1 is detected by a stack height scanner 7, the output signal of which can be seen whether the upper edge of stack 1 is within or outside a certain height range. The output of the stack height scanner 7 is connected to the control device 8, in which the corresponding control signals for the speed controller 6 are formed. Furthermore, the control device 8 is supplied with the processing speed of the printing press 11 shown symbolically here. The processing speed can be a tachometer signal from the main drive or a pulse sequence of speed-dependent frequency. The substrate thickness can also be supplied to the control device 8, which, as indicated in FIG. 1, can be done via manual data input, in particular via a control center computer 9, from which the entire printing press 11 can be monitored and operated.

Die Steuervorrichtung 8 ist nun dazu ausgebildet, in Abhängigkeit der Verarbeitungsgeschwindigkeit der Druckmaschine 11 und der über den Leitstandsrechner 9 eingegebenen Bedruckstoffstärke den Drehzahlsteller 6 zwischen kontinuierlichen und diskontinuierlichen Betrieb umzuschalten. Bei kontinuierlichem Betrieb wird von der Steuervorrichtung 8 ein Drehzahlsollwert an den Drehzahlsteller 6 derartig vorgegeben, so daß die Oberkante von Stapel 1 stets innerhalb eines durch den Stapelhöhenabtaster 7 kontrollierten Höhenbereiches liegt. Der Drehzahlsollwert errechnet sich dabei aus der Verarbeitungsgeschwindigkeit der Druckmaschine 11 und der Bedruckstoffstärke, wobei die Übersetzung von Hubgetriebe 3 berücksichtigt wird. Die Ausgangssignale von Stapelhöhenabtaster 7 werden in der Steuervorrichtung 8 auf Einhaltung einer Sollhöhe der Stapeloberkante überwacht. Bei Über- und Unterschreiten der Sollhöhe werden von der Steuervorrichtung 8 die berechnten Solldrehzahlwerte mit zusätzlichen Korrekturen an den Drehzahlsteller 6 weitergegeben.The control device 8 is now designed to switch the speed controller 6 between continuous and discontinuous operation depending on the processing speed of the printing press 11 and the printing material thickness entered via the control center computer 9. In continuous operation, the control device 8 specifies a speed setpoint to the speed controller 6 in such a way that the upper edge of stack 1 is always within a height range controlled by the stack height scanner 7. The speed setpoint is calculated from the processing speed of the printing press 11 and the substrate thickness, the translation of the lifting gear 3 being taken into account. The output signals from the stack height scanner 7 are monitored in the control device 8 for compliance with a target height of the top edge of the stack. If the setpoint height is exceeded and undershot, the calculated setpoint speed values are passed on to the speed controller 6 with additional corrections by the control device 8.

Bei diskontinuierlichem Betrieb überwacht Steuervorrichtung 8 lediglich ein Über- bzw. Unterschreiten der Oberkante von Stapel 1, was durch den Stapelhöhenabtaster 7 festgestellt wird. Wird die Höhe unterschritten, so veranlaßt Steuervorrichtung 8 über Drehzahlsteller 6 ein Heben des Stapels 1 bis beispielsweise eine Obergrenze erreicht wird. Nach einer bestimmten Zeit, d.h. nach einer bestimmten Zahl abgeförderter Bogen wird von Steuervorrichtung 8 wiederum ein Nachheben von Stapel 1 veranlaßt.In the case of discontinuous operation, control device 8 only monitors whether the upper edge of stack 1 is exceeded or undershot, which is determined by stack height scanner 7. If the height falls below, the control device 8 causes the stack 1 to be raised via the speed controller 6 until, for example, an upper limit is reached. After a certain time, i.e. after a certain number of sheets removed, control device 8 again causes stack 1 to be lifted.

Das Umschalten zwischen kontinuierlichem und diskontinuierlichem Stapelhubbetrieb nimmt Steuervorrichtung 8 auf Grund eines Vergleiches der aktuellen Verarbeitungsgeschwindigkeit der Druckmaschine 11 und der zuvor eingegebenen Bedruckstoffstärke vor. Die Steuervorrichtung 8 steht dazu in Wirkverbindung mit einem Kennlinienspeicher 10, indem eine Kennlinie abgespeichert ist. Fig. 2 zeigt ein quantitatives Beispiel für die gespeicherte Kennlinie, die in einer durch die Achse der Verarbeitungsgeschwindigkeit V der Maschine mit der Bedruckstoffstärke B gebildeten Ebene liegt. Mit D ist der Bereich des diskontinuierlichen und mit K der Bereich des kontinuierlichen Stapelhubbetriebes gekennzeichnet. Gemäß dem Ausführungsbeispiel wird nun bei einer Bedruckstoffstärke B = 0.5 mm bis zu einer Verarbeitungsgeschwindigkeit V = 3.000 Bogen/h der Stapel 1 diskontinuierlich gehoben. Bei Verarbeitungsgeschwindigkeiten oberhalb von 3.000 Bogen/h (gleiche Bedruckstoffstärke) wird der Stapel 1 kontinuierlich nachgehoben. Der Kennlinienspeicher 10 enthält somit für eine Vielzahl von Bedrucksotffstärken B die Verarbeitungsgeschwindigkeit V, bei der zwischen kontinuierlichen und diskontinuierlichen Betrieb umzuschalten ist.The control device 8 switches over between continuous and discontinuous stacking stroke operation on the basis of a comparison of the current processing speed of the printing press 11 and the previously entered printing material thickness. For this purpose, the control device 8 is operatively connected to a characteristic curve memory 10 in that a characteristic curve is stored. 2 shows a quantitative example of the stored characteristic curve which lies in a plane formed by the axis of the processing speed V of the machine with the printing material thickness B. D denotes the area of discontinuous and K the area of continuous stacking operation. According to the exemplary embodiment, the stack 1 is now lifted discontinuously at a printing material thickness B = 0.5 mm up to a processing speed V = 3,000 sheets / h. At processing speeds above 3,000 sheets / h (same substrate thickness), stack 1 is continuously lifted. The characteristic curve memory 10 thus contains the processing speed V for a large number of printing material strengths B, at which it is necessary to switch between continuous and discontinuous operation.

Claims (3)

  1. Control device for a pile lifting drive on sheet treating machines, particularly sheet printing presses, wherein a pile height sensor (7) stands in operative connection with the control device (8) according to the output signal of which a motor (4) is controllable via a rotational speed adjuster (6) and in the control device the working speed V of the machine, as well as the thickness of the material to be printed B, can be taken into calculation, characterised in that the control unit (8) is constructed in such a way as to switch between a continuous and a discontinuous drive via the rotational speed adjuster (6) the motor (4) in dependence on the operating speed V of the machine and the predetermined thickness B of the material to be printed, that a characteristic curve memory (10) operatively connected with the control unit (8) is provided in which is storable in the shape of a characteristic curve, for a plurality of thicknesses B of the material to be printed, at which operating speed V of the machine the switching over between continuous and discontinuous drive results.
  2. Control device according to Claim 1, characterised in that the motor (4) is constructed as an asynchronous alternating current motor.
  3. Control device according to Claim 1 or 2, characterised in that the thickness B of the material to be printed can be input via a manual data input unit of a control panel computer (9) arranged relative to the printing press (11).
EP92117162A 1991-10-30 1992-10-08 Control device for a pile lifting drive in a sheet-processing machine, particularly for sheet-printing machines Expired - Lifetime EP0539773B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4135752A DE4135752C1 (en) 1991-10-30 1991-10-30
DE4135752 1991-10-30

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EP0539773A1 EP0539773A1 (en) 1993-05-05
EP0539773B1 true EP0539773B1 (en) 1994-12-21

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EP92117162A Expired - Lifetime EP0539773B1 (en) 1991-10-30 1992-10-08 Control device for a pile lifting drive in a sheet-processing machine, particularly for sheet-printing machines

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US (1) US5295678A (en)
EP (1) EP0539773B1 (en)
JP (1) JPH0741996B2 (en)
DE (2) DE4135752C1 (en)

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Also Published As

Publication number Publication date
DE59201024D1 (en) 1995-02-02
JPH0741996B2 (en) 1995-05-10
EP0539773A1 (en) 1993-05-05
JPH05278872A (en) 1993-10-26
DE4135752C1 (en) 1992-11-12
US5295678A (en) 1994-03-22

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