EP0673865A2 - Pile elevating device - Google Patents

Pile elevating device Download PDF

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Publication number
EP0673865A2
EP0673865A2 EP95104010A EP95104010A EP0673865A2 EP 0673865 A2 EP0673865 A2 EP 0673865A2 EP 95104010 A EP95104010 A EP 95104010A EP 95104010 A EP95104010 A EP 95104010A EP 0673865 A2 EP0673865 A2 EP 0673865A2
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EP
European Patent Office
Prior art keywords
stack
sheet
electric motor
level signal
certain
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.)
Granted
Application number
EP95104010A
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German (de)
French (fr)
Other versions
EP0673865B1 (en
EP0673865A3 (en
Inventor
Richard Küster
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.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
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Publication date
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Publication of EP0673865A2 publication Critical patent/EP0673865A2/en
Publication of EP0673865A3 publication Critical patent/EP0673865A3/en
Application granted granted Critical
Publication of EP0673865B1 publication Critical patent/EP0673865B1/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
    • 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
    • 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
    • B65H1/14—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 comprising positively-acting mechanical devices
    • 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
    • B65H2511/10—Size; Dimensions
    • B65H2511/13—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices
    • B65H2801/21—Industrial-size printers, e.g. rotary printing press
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S414/00—Material or article handling
    • Y10S414/10—Associated with forming or dispersing groups of intersupporting articles, e.g. stacking patterns
    • Y10S414/102—Associated with forming or dispersing groups of intersupporting articles, e.g. stacking patterns including support for group
    • Y10S414/103—Vertically shiftable
    • Y10S414/105—Shifted by article responsive means

Definitions

  • the invention relates to a stack lifting device with a stack lifting table carrying a sheet stack, which can be raised and lowered by an electric motor and from the sheet stack of which the uppermost sheets can be removed in a certain cycle and fed to a sheet processing machine, with a sensing device an upper level signal can be generated when the sheet stack is raised and a certain level of the sheet stack surface is reached, and a lower level signal can be generated when the upper level of the sheet stack surface falls below a certain lower level, and these signals can be fed to a control unit by means of which, depending on the signals supplied, a control signal can be generated for driving the electric motor.
  • a value is determined from the stack lifting movement and the work cycle, which value is compared with a predetermined sheet thickness.
  • the stacking stroke movement is corrected in accordance with the deviation from the specified sheet thickness.
  • the object of the invention is to provide a stack lifting device of the type mentioned at the outset, by means of which the lifting speed of the stack lifting table can be set automatically.
  • the stack lifting table can be raised until an upper level signal is triggered and can be held in this position in that after the upper level signal has been triggered by a counter, the number of sheets removed from the stack of sheets until a lower level signal is triggered countable and a corresponding signal from the control unit can be supplied that after triggering the lower level signal, both the electric motor of the stacking lifting table can be actuated by the height difference between the determined upper and the determined lower level up to the second triggering of the upper level signal and can also be controlled from the control unit the height difference between the upper and lower levels and the number of sheets counted, the sheet thickness and from the sheet thickness and the cycle time a lifting speed can be determined, which can be stored as a control variable for the electric motor and with d after the second triggering of the upper level signal, the electric motor (4) can be actuated for the at least approximately continuous drive.
  • the lifting speed of the stacking lifting table can be set automatically without manual intervention by the personnel monitoring the machine, taking into account not only the actual sheet thickness, but also all other variables influencing the height of the sheet stack, such as the sheet surface and sheet roughness. Since the operator no longer has to intervene with new sheets during the start-up phase, it is relieved and can therefore take care of a larger number of sheet processing systems.
  • the at least approximately continuous mode of operation of the electric motor protects it and leads to considerably longer running times and longer maintenance intervals for the electric motor.
  • a so-called non-stop change of the sheet stack is also possible automatically without interrupting operation if the surface of the sheet stack drops below the certain upper level during the activation of the electric motor for at least approximately continuous drive by a sensor, and the electric motor can be actuated to accelerate the stack lifting table by a certain amount of height.
  • the determined height corresponds to the thickness of the skewers of an auxiliary stacking table.
  • This specific height dimension can be entered manually and can be stored in the control unit.
  • a direct current motor or a frequency-directed three-phase motor is particularly suitable as an electric motor for almost continuous drive.
  • a stacking lifting table 2 is suspended from lifting chains 3 on a stacking lifting frame 1.
  • the lifting chains 3 can be driven by an electric motor 4 to raise or lower the stack lifting table 2 via chain wheels (not shown).
  • a sheet separating device 6 symbolized by a suction device is arranged on the stacking lifting frame 1, through which the uppermost sheet of the sheet stack 5 can be detected and fed to a belt table 7 in a certain cycle.
  • the conveyor table 7 promotes the sheet then to a sheet processing machine, not shown, such as a printing press.
  • the sensing device 8 can be a pivotable probe arm, an electrical sensor, but also a device that optically detects the height level.
  • An electronic control unit 9 receives an upper level signal from the sensing device 8 when the sheet stacking surface 10 has reached a certain upper level during a lifting movement of the stacking lifting table 2. Furthermore, a lower level signal is fed from the sensing device 8 to the electronic control unit 9 when the sheet stack surface 10 has dropped to a certain lower level due to sheet consumption.
  • control unit 9 receives corresponding counting pulses which can be counted by a counter present in the control unit 9 in the time between an upper and a lower level signal.
  • control unit 9 Depending on the signals supplied to the control unit 9, the control unit 9 generates a control signal for controlling the electric motor 4.
  • the control unit 9 controls the electric motor 4 such that it gradually or continuously raises the stacking table 2 at a certain speed until at When the determined upper level is reached by the sheet stacking surface 10, the sensing device 8 generates an upper level signal and sends it to the control unit 9. From this moment on, the counter of the control unit 9 counts the sheets conveyed by the sheet separation unit 6 until a lower level signal is triggered by the sensing device 8 and fed to the control unit 9.
  • This lower level signal triggers that the electric motor 4 lifts the stack lifting table 2 relatively quickly until the sheet stacking surface 10 has reached the certain upper level and triggers a second upper level signal.
  • control unit 9 from the Counter counted number of sheets and the height difference stored in the control unit 9 between the upper and lower level determines the sheet thickness and a stroke speed from the sheet thickness and the cycle time also stored in the control unit 9.
  • the cycle time is not stored, it can also be determined by the control unit from the impulses of the sheet separating device supplied to the counter.
  • This lifting speed is stored as a control variable for the electric motor 4 in the control unit 9.
  • the electric motor 4 is acted upon by the control variable after the second triggering of the upper level signal in such a way that it can further be controlled for the at least approximately continuous drive and keeps the sheet stacking surface 10 largely uniform at the level of the upper level during further operation.
  • the sensing device 8 If the sheet stack surface 10 drops during further operation, for example due to a non-stop stack change, this is detected by the sensing device 8 and triggers a control of the electric motor 4 which triggers the stack lifting table 2 accelerates until it reaches the upper level through the arch surface 10. The control then switches back to continuous drive.
  • the accelerated lifting movement either takes place until an upper level signal is triggered or can be entered manually as a certain height measure via an input unit 11 of the stever unit 9 and stored therein.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Pile Receivers (AREA)
  • Bridges Or Land Bridges (AREA)
  • Piles And Underground Anchors (AREA)
  • Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
  • De-Stacking Of Articles (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Stacking Of Articles And Auxiliary Devices (AREA)

Abstract

Die Erfindung bezieht sich auf eine Stapelhubvorrichtung mit einem einen Bogenstapel (5) tragenden Stapelhubtisch (2). Dieser Stapelhubtisch (2) ist durch einen Elektromotor (4) heb- und senkbar antreibbar. Von dem Bogenstapel (5) sind die jeweils obersten Bogen in einem bestimmten Takt entnehmbar und einer Bogen verarbeitenden Maschine zuführbar. Durch eine Fühlvorrichtung (8) ist bei Anheben des Bogenstapels (5) und Erreichen eines bestimmten oberen Niveaus der Bogenstapeloberfläche (10) ein oberes Niveausignal sowie bei Absinken des oberen NIveaus der Bogenstapeloberfläche (10) unter ein bestimmtes unteres Niveau ein unteres Niveausignal erzeugbar. Diese Signale sind einer Steuereinheit (9) zuführbar. Durch die Steuereinheit (9) ist in Abhängigkeit von den zugeführten Signalen ein Ansteuersignal zum Ansteuern des Elektromotors (4) erzeugbar. <IMAGE>The invention relates to a stack lifting device with a stack lifting table (2) carrying a sheet stack (5). This stacking lift table (2) can be driven by an electric motor (4) so that it can be raised and lowered. The uppermost sheets can be removed from the sheet stack (5) in a certain cycle and fed to a sheet processing machine. When the sheet stack (5) is raised and a certain upper level of the sheet stack surface (10) is reached, an upper level signal and a lower level signal when the upper level of the sheet stack surface (10) falls below a certain lower level can be generated by a sensing device (8). These signals can be fed to a control unit (9). A control signal for controlling the electric motor (4) can be generated by the control unit (9) depending on the signals supplied. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Stapelhubvorrichtung mit einem einen Bogenstapel tragenden Stapelhubtisch, der durch einen Elektromotor heb- und senkbar antreibbar ist und von dessen Bogenstapel die jeweils obersten Bogen in einem bestimmten Takt entnehmbar und einer Bogen verarbeitenden Maschine zuführbar sind, mit einer Fühlvorrichtung, durch die bei Anheben des Bogenstapels und Erreichen eines bestimmten Niveaus der Bogenstapeloberfläche ein oberes Niveausignal sowie bei Absinken des oberen Niveaus der Bogenstapeloberfläche unter ein bestimmtes unteres Niveau ein unteres Niveausignal erzeugbar und diese Signale einer Steuereinheit zuführbar sind, durch die in Abhängigkeit von den zugeleiteten Signalen ein Ansteuersignal zum Ansteuern des Elektromotors erzeugbar ist.The invention relates to a stack lifting device with a stack lifting table carrying a sheet stack, which can be raised and lowered by an electric motor and from the sheet stack of which the uppermost sheets can be removed in a certain cycle and fed to a sheet processing machine, with a sensing device an upper level signal can be generated when the sheet stack is raised and a certain level of the sheet stack surface is reached, and a lower level signal can be generated when the upper level of the sheet stack surface falls below a certain lower level, and these signals can be fed to a control unit by means of which, depending on the signals supplied, a control signal can be generated for driving the electric motor.

Bei einer derartigen bekannten Stapelhubvorrichtung wird aus der Stapelhubbewegung und dem Arbeitstakt ein Wert ermittelt, der mit einer vorgegebenen Bogendicke verglichen wird. Entsprechend der Abweichung von der vorgegebenen Bogendicke erfolgt eine Korrektur der Stapelhubbewegung.In such a known stack lifting device, a value is determined from the stack lifting movement and the work cycle, which value is compared with a predetermined sheet thickness. The stacking stroke movement is corrected in accordance with the deviation from the specified sheet thickness.

Aufgabe der Erfindung ist es eine Stapelhubvorrichtung der eingangs genannten Art zu schaffen, durch die selbsttätig die Hubgeschwindigkeit des Stapelhubtischs einstellbar ist.The object of the invention is to provide a stack lifting device of the type mentioned at the outset, by means of which the lifting speed of the stack lifting table can be set automatically.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß nach Einschalten der Stapelhubvorrichtung der Stapelhubtisch bis zum Auslösen eines oberen Niveausignals anhebbar und in dieser Lage haltbar ist, daß nach Auslösen des oberen Niveausignals von einem Zähler die Anzahl der vom Bogenstapel entnommenen Bogen bis zum Auslösen eines unteren Niveausignals zählbar und ein entsprechendes Signal der Steuereinheit zuleitbar ist, daß nach Auslösen des unteren Niveausignals sowohl der Elektromotor des Stapelhubtischs diesen um die Höhendifferenz zwischen dem bestimmten oberen und dem bestimmten unteren Niveau bis zum zweiten Auslösen des oberen Niveausignals anhebbar ansteuerbar ist als auch von der Steuereinheit aus der Höhendifferenz zwischen dem oberen und unteren Niveau und der Anzahl der gezählten Bogen die Bogenstärke sowie aus der Bogenstärke und der Taktzeit eine Hubgeschwindigkeit ermittelbar ist, die als Ansteuergröße für den Elektromotor speicherbar ist und mit der der Elektromotor (4) nach dem zweiten Auslösen des oberen Niveausignals zum zumindest annähernd kontinuierlichen Antrieb ansteuerbar ist. Auf diese Weise kann auf einfache Art ohne manuelles Eingreifen des die Maschine überwachenden Personals die Hubgeschwindigkeit des Stapelhubtischs selbsttätig eingestellt werden, wobei nicht nur die tatsächliche Bogendicke, sondern darüber hinaus auch alle weiteren, die Höhe des Bogenstapels beeinflussenden Größen wie z.B. die Bogenoberfläche und Bogenrauigkeit berücksichtigt werden. Da das Bedienungsperonal während der Anlaufphase mit neuen Bogen nicht mehr korrigierend eingreifen braucht, ist es entlastet und kann somit gleichzeitig eine größere Anzahl von Bogen verarbeitenden Anlagen betreuen.This object is achieved in that after the stack lifting device is switched on, the stack lifting table can be raised until an upper level signal is triggered and can be held in this position in that after the upper level signal has been triggered by a counter, the number of sheets removed from the stack of sheets until a lower level signal is triggered countable and a corresponding signal from the control unit can be supplied that after triggering the lower level signal, both the electric motor of the stacking lifting table can be actuated by the height difference between the determined upper and the determined lower level up to the second triggering of the upper level signal and can also be controlled from the control unit the height difference between the upper and lower levels and the number of sheets counted, the sheet thickness and from the sheet thickness and the cycle time a lifting speed can be determined, which can be stored as a control variable for the electric motor and with d after the second triggering of the upper level signal, the electric motor (4) can be actuated for the at least approximately continuous drive. In this way, in a simple way The lifting speed of the stacking lifting table can be set automatically without manual intervention by the personnel monitoring the machine, taking into account not only the actual sheet thickness, but also all other variables influencing the height of the sheet stack, such as the sheet surface and sheet roughness. Since the operator no longer has to intervene with new sheets during the start-up phase, it is relieved and can therefore take care of a larger number of sheet processing systems.

Die zumindest annähernd kontinuierliche Arbeitsweise des Elektromotors schont diesen und führt zu erheblich höheren Laufzeiten und längeren Wartungsintervallen des Elektromotors.The at least approximately continuous mode of operation of the electric motor protects it and leads to considerably longer running times and longer maintenance intervals for the electric motor.

Auch ein sogenannter Nonstopwechsel des Bogenstapels ist ohne Betriebsunterbrechung selbsttätig möglich, wenn ein Absinken der Bogenstapeloberfläche unter das bestimmte obere Niveau während der Ansteuerung des Elektromotors zum zumindest annähernd kontinuierlichen Antrieb durch einen Fühler erkennbar und der Elektromotor den Stapelhubtisch um ein bestimmtes Höhenmaß beschleunigt anhebend ansteuerbar ist.A so-called non-stop change of the sheet stack is also possible automatically without interrupting operation if the surface of the sheet stack drops below the certain upper level during the activation of the electric motor for at least approximately continuous drive by a sensor, and the electric motor can be actuated to accelerate the stack lifting table by a certain amount of height.

Vorzugsweise entspricht dabei das bestimmte Höhenmaß der Dicke der Spieße eines Hilfsstapeltischs.Preferably, the determined height corresponds to the thickness of the skewers of an auxiliary stacking table.

Dieses bestimmte Höhenmaß kann manuell eingebbar und in der Steuereinheit speicherbar sein.This specific height dimension can be entered manually and can be stored in the control unit.

Als Elektromotor zum annähernd kontinuierlichen Antrieb ist ein Gleichstrommotor oder ein frequenzgerichteter Drehstrommotor besonders geeignet.A direct current motor or a frequency-directed three-phase motor is particularly suitable as an electric motor for almost continuous drive.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Die einzige Figur der Zeichnung zeigt eine Stapelvorrichtung in der Seitenansicht.An embodiment of the invention is shown in the drawing and will be described in more detail below. The only figure in the drawing shows a stacking device in a side view.

An einem Stapelhubgestell 1 ist ein Stapelhubtisch 2 an Hubketten 3 aufgehängt. Die Hubketten 3 sind über nicht dargestellte Kettenräder von einem Elektromotor 4 den Stapelhubtisch 2 hebend bzw. senkend antreibbar.A stacking lifting table 2 is suspended from lifting chains 3 on a stacking lifting frame 1. The lifting chains 3 can be driven by an electric motor 4 to raise or lower the stack lifting table 2 via chain wheels (not shown).

Über einem auf dem Stapelhubtisch 2 aufliegenden Bogenstapel 5 ist an dem Stapelhubgestell 1 eine durch einen Sauger symbolisierte Bogenvereinzelungseinrichtung 6 angeordnet, durch die in einem bestimmten Takt der jeweils oberste Bogen des Bogenstapels 5 erfaßbar und einem Bändertisch 7 zuführbar ist. Der Bändertisch 7 fördert den Bogen dann zu einer nicht dargestellten Bogen verarbeitenden Maschine wie z.B. einer Druckmaschine.Above a sheet stack 5 resting on the stacking lifting table 2, a sheet separating device 6 symbolized by a suction device is arranged on the stacking lifting frame 1, through which the uppermost sheet of the sheet stack 5 can be detected and fed to a belt table 7 in a certain cycle. The conveyor table 7 promotes the sheet then to a sheet processing machine, not shown, such as a printing press.

Oberhalb des Stapels, mit dem Stapelhubgestell 1 korrespondierend, ist weiterhin eine Fühlvorrichtung 8 angeordnet, durch die das Höhenniveau der Bogenstapeloberfläche 10 erfaßbar ist. Die Fühlvorrichtung 8 kann dabei ein schwenkbarer Tastarm, ein elektrischer Sensor, aber auch eine optisch das Höhenniveau erfassende Einrichtung sein.Above the stack, corresponding to the stack lifting frame 1, there is also a sensing device 8 by means of which the height level of the sheet stack surface 10 can be detected. The sensing device 8 can be a pivotable probe arm, an electrical sensor, but also a device that optically detects the height level.

Einer elektronischen Steuereinheit 9 wird von der Fühlvorrichtung 8 ein oberes Niveausignal zugeleitet, wenn bei einer Anhubbewegung des Stapelhubtischs 2 die Bogenstapeloberfläche 10 ein bestimmtes oberes Niveau erreicht hat. Weiterhin wird von der Fühlvorrichtung 8 der elektronischen Steuereinheit 9 ein unteres Niveausignal zugeleitet, wenn durch Bogenverbrauch die Bogenstapeloberfläche 10 auf ein bestimmtes unteres Niveau abgesunken ist.An electronic control unit 9 receives an upper level signal from the sensing device 8 when the sheet stacking surface 10 has reached a certain upper level during a lifting movement of the stacking lifting table 2. Furthermore, a lower level signal is fed from the sensing device 8 to the electronic control unit 9 when the sheet stack surface 10 has dropped to a certain lower level due to sheet consumption.

Von der Bogenvereinzelungseinrichtung 6 werden der Steuereinheit 9 den Arbeitstakten entsprechende Zählimpulse zugeleitet, die von einem in der Steuereinheit 9 vorhandenen Zähler in der Zeit zwischen einem oberen und einem unteren Niveausignal zählbar sind.From the sheet separating device 6, the control unit 9 receives corresponding counting pulses which can be counted by a counter present in the control unit 9 in the time between an upper and a lower level signal.

Abhängig von den der Steuereinheit 9 zugeleiteten Signalen erzeugt die Steuereinheit 9 ein Ansteuersignal zum Ansteuern des Elektromotors 4.Depending on the signals supplied to the control unit 9, the control unit 9 generates a control signal for controlling the electric motor 4.

Ist auf den in seine untere Lage gefahrenen Stapelhubtisch 2 ein neuer Bogenstapel 5 mit Bogen nicht bekannter Dicke aufgelegt worden, so wird von der Steuereinheit 9 der Elektromotor 4 derart angesteuert, daß er den Stapelhubtisch 2 mit einer bestimmten Geschwindigkeit schrittweise oder kontinuierlich anhebt, bis bei Erreichen des bestimmten oberen Niveaus durch die Bogenstapeloberfläche 10 die Fühlvorrichtung 8 ein oberes Niveausignal erzeugt und der Steuereinheit 9 zuleitet. Von diesem Moment an werden durch den Zähler der Steuereinheit 9 die von der Bogenvereinzelungseinheit 6 geförderten Bogen gezählt, bis ein unteres Niveausignal von der Fühlvorrichtung 8 ausgelöst und der Steuereinheit 9 zugeleitet wird.If a new sheet stack 5 with sheets of unknown thickness has been placed on the stacking table 2 moved into its lower position, the control unit 9 controls the electric motor 4 such that it gradually or continuously raises the stacking table 2 at a certain speed until at When the determined upper level is reached by the sheet stacking surface 10, the sensing device 8 generates an upper level signal and sends it to the control unit 9. From this moment on, the counter of the control unit 9 counts the sheets conveyed by the sheet separation unit 6 until a lower level signal is triggered by the sensing device 8 and fed to the control unit 9.

Dieses untere Niveausignal löst aus, daß der Elektromotor 4 den Stapelhubtisch 2 relativ schnell anhebt, bis die Bogenstapeloberfläche 10 das bestimmte obere Niveau erreicht hat und ein zweites oberes Niveausignal auslöst.This lower level signal triggers that the electric motor 4 lifts the stack lifting table 2 relatively quickly until the sheet stacking surface 10 has reached the certain upper level and triggers a second upper level signal.

Gleichzeitig wird von der Steuereinheit 9 aus der im Zähler gezählten Anzahl von Bogen und der in der Steuereinheit 9 gespeicherten Höhendifferenz zwischen oberem und unterem Niveau die Bogenstärke sowie aus der Bogenstärke und der ebenfalls in der Steuereinheit 9 gespeicherten Taktzeit eine Hubgeschwindigkeit ermittelt.At the same time, the control unit 9 from the Counter counted number of sheets and the height difference stored in the control unit 9 between the upper and lower level determines the sheet thickness and a stroke speed from the sheet thickness and the cycle time also stored in the control unit 9.

Ist die Taktzeit nicht gespeichert, so kann sie durch die Steuereinheit auch aus den dem Zähler zugeleiteten Impulsen der Bogenvereinzelungseinrichtung ermittelt werden.If the cycle time is not stored, it can also be determined by the control unit from the impulses of the sheet separating device supplied to the counter.

Diese Hubgeschwindigkeit wird als Ansteuergröße für den Elektromotor 4 in der Steuereinheit 9 gespeichert.This lifting speed is stored as a control variable for the electric motor 4 in the control unit 9.

Weiterhin wird der Elektromotor 4 nach dem zweiten Auslösen des oberen Niveausignals mit der Ansteuergröße derart beaufschlagt, daß dieser im weiteren zum zumindest annähernd kontinuierlichen Antrieb ansteuerbar ist und die Bogenstapeloberfläche 10 im weiteren Betrieb weitgehend gleichmäßig in der Höhe des oberen Niveaus hält.Furthermore, the electric motor 4 is acted upon by the control variable after the second triggering of the upper level signal in such a way that it can further be controlled for the at least approximately continuous drive and keeps the sheet stacking surface 10 largely uniform at the level of the upper level during further operation.

Sinkt die Bogenstapeloberfläche 10 während des weiteren Betriebs z.B. durch einen Nonstop-Stapelwechsel ab, so wird dies von der Fühlvorrichtung 8 erfaßt und löst eine Ansteuerung des Elektromotors 4 aus, die den Stapelhubtisch 2 beschleunigt bis zum Erreichen des oberen Niveaus durch die Bogenoberfläche 10 anhebt. Danach geht die Ansteuerung wieder auf kontinuierlichen Antrieb über.If the sheet stack surface 10 drops during further operation, for example due to a non-stop stack change, this is detected by the sensing device 8 and triggers a control of the electric motor 4 which triggers the stack lifting table 2 accelerates until it reaches the upper level through the arch surface 10. The control then switches back to continuous drive.

Die beschleunigte Anhubbewegung erfolgt entweder bis zur Auslösung eines oberen Niveausignals oder ist als ein bestimmtes Höhenmaß über eine Eingabeeinheit 11 der Stevereinheit 9 manuell eingebbar und in dieser speicherbar.The accelerated lifting movement either takes place until an upper level signal is triggered or can be entered manually as a certain height measure via an input unit 11 of the stever unit 9 and stored therein.

Claims (5)

Stapelhubvorrichtung mit einem einen Bogenstapel tragenden Stapelhubtisch, der durch einen Elektromotor heb- und senkbar antreibbar ist und von dessen Bogenstapel die jeweils obersten Bogen in einem bestimmten Takt entnehmbar und einer Bogen verarbeitenden Maschine zuführbar sind, mit einer Fühlvorrichtung, durch die bei Anheben des Bogenstapels und Erreichen eines bestimmten Niveaus der Bogenstapeloberfläche ein oberes Niveausignal sowie bei Absinken des oberen Niveaus der Bogenstapeloberfläche unter ein bestimmtes unteres Niveau ein unteres Niveausignal erzeugbar und diese Signale einer Steuereinheit zuführbar sind, durch die in Abhängigkeit von den zugeleiteten Signalen ein Ansteuersignal zum Ansteuern des Elektromotors erzeugbar ist, dadurch gekennzeichnet, daß nach Einschalten der Stapelhubvorrichtung der Stapelhubtisch (2) bis zum Auslösen eines oberen Niveausignals anhebbar und in dieser Lage haltbar ist, daß nach Auslösen des oberen Niveausignals von einem Zähler die Anzahl der vom Bogenstapel (5) entnommenen Bogen bis zum Auslösen eines unteren Niveausignals zählbar und ein entsprechendes Signal der Steuereinheit (9) zuleitbar ist, daß nach Auslösen des unteren NIveausignals sowohl der Elektromotor (4) des Stapelhubtischs (2) diesen um die Höhendifferenz zwischen dem bestimmten oberen und dem bestimmten unteren Niveau bis zum zweiten Auslösen des oberen Niveausignals anhebbar ansteuerbar ist, als auch von der Steuereinheit (9) aus der Höhendifferenz zwischen dem oberen und unteren Niveau und der Anzahl der gezählten Bogen die Bogenstärke sowie aus der Bogenstärke und der Taktzeit eine Hubgeschwindigkeit ermittelbar ist, die als Ansteuergröße für den Elektromotor (4) speicherbar ist und mit der der Elektromotor (4) nach dem zweiten Auslösen des oberen Niveausignals zum zumindest annähernd kontinuierlichen Antrieb ansteuerbar ist.Stack lifting device with a stack lifting table carrying a sheet stack, which can be driven and raised by an electric motor and from the sheet stack of which the uppermost sheets can be removed in a certain cycle and fed to a sheet processing machine, with a sensing device by which when the sheet stack is lifted and Reaching a certain level of the sheet stack surface, an upper level signal and, if the upper level of the sheet stack surface falls below a certain lower level, a lower level signal can be generated and these signals can be fed to a control unit, by means of which a control signal for controlling the electric motor can be generated depending on the supplied signals , characterized in that after the stack lifting device is switched on, the stack lifting table (2) can be raised until an upper level signal is triggered and can be held in this position, that after triggering the upper level signal from a counter The number of sheets taken from the sheet stack (5) can be counted until a lower level signal is triggered and a corresponding signal can be fed to the control unit (9) that after the lower level signal has been triggered Both the electric motor (4) of the stacking table (2) can be raised by the height difference between the certain upper and the certain lower level until the second triggering of the upper level signal, and also by the control unit (9) from the height difference between the upper and lower level and the number of sheets counted, the sheet thickness and a lifting speed can be determined from the sheet thickness and the cycle time, which can be stored as a control variable for the electric motor (4) and with which the electric motor (4) at least after the second triggering of the upper level signal approximately continuous drive can be controlled. Stapelhubvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß ein Absinken der Bogenstapeloberfläche (10) unter das bestimmte Niveau während der Ansteuerung des Elektromotors (4) zum zumindest annähernd kontinuierlichem Antrieb durch einen Fühler erkennbar und der Elektromotor (4) den Stapelhubtisch (2) um ein bestimmtes Höhenmaß beschleunigt anhebend ansteuerbar ist.Stacking lifting device according to claim 1, characterized in that a sinking of the sheet stacking surface (10) below the certain level during the control of the electric motor (4) for the at least approximately continuous drive can be recognized by a sensor and the electric motor (4) the stacking lifting table (2) by certain height dimension can be activated in an accelerating manner. Stapelhubvorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß das bestimmte Höhenmaß der Dicke der Spieße eines Hilfsstapeltisches entspricht.Stacking lifting device according to claim 2, characterized in that the determined height corresponds to the thickness of the skewers of an auxiliary stacking table. Stapelhubvorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß das bestimmte Höhenmaß manuell eingebbar und in der Steuereinheit (9) speicherbar ist.Stack lifting device according to claim 3, characterized in that the determined height dimension can be entered manually and stored in the control unit (9). Stapelhubvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Elektromotor (4) ein Gleichstrommotor oder ein frequenzgerichteter Drehstrommotor ist.Stacking lifting device according to one of the preceding claims, characterized in that the electric motor (4) is a direct current motor or a frequency-directed three-phase motor.
EP95104010A 1994-03-25 1995-03-18 Pile elevating device Expired - Lifetime EP0673865B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4410384A DE4410384C1 (en) 1994-03-25 1994-03-25 Control for stack lift device
DE4410384 1994-03-25

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EP0673865A2 true EP0673865A2 (en) 1995-09-27
EP0673865A3 EP0673865A3 (en) 1996-03-20
EP0673865B1 EP0673865B1 (en) 1998-07-01

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JP (1) JP2825775B2 (en)
AT (1) ATE167845T1 (en)
DE (2) DE4410384C1 (en)

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Also Published As

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JPH07267387A (en) 1995-10-17
ATE167845T1 (en) 1998-07-15
EP0673865B1 (en) 1998-07-01
JP2825775B2 (en) 1998-11-18
DE59502665D1 (en) 1998-08-06
DE4410384C1 (en) 1995-05-24
US5556252A (en) 1996-09-17
EP0673865A3 (en) 1996-03-20

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