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EP0673865B1 - Pile elevating device - Google Patents

Pile elevating device Download PDF

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Publication number
EP0673865B1
EP0673865B1 EP95104010A EP95104010A EP0673865B1 EP 0673865 B1 EP0673865 B1 EP 0673865B1 EP 95104010 A EP95104010 A EP 95104010A EP 95104010 A EP95104010 A EP 95104010A EP 0673865 B1 EP0673865 B1 EP 0673865B1
Authority
EP
European Patent Office
Prior art keywords
sheet
stack
pile
electric motor
fed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95104010A
Other languages
German (de)
French (fr)
Other versions
EP0673865A3 (en
EP0673865A2 (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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Filing date
Publication date
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
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
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H1/00—Supports or magazines for piles from which articles are to be separated
    • B65H1/08—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 is drivable and from the sheet stack each top bow can be removed in a certain cycle and a sheet processing machine can be fed with a sensing device, by lifting the sheet stack and reaching a certain level of sheet stack surface an upper level signal as well as at Descent of the upper level of the sheet stacking surface below a certain lower level a lower level signal can be generated and these signals of a control unit are feedable, depending on the incoming Signals a control signal to control the Electric motor can be generated.
  • EP-A-0 539 773 is a control for a stack lifting device of the type mentioned at the beginning, in which the stack lifting speed is controlled by a control device is continuously controllable. The control takes place depending on the processing speed a press and the sheet thickness the sheets to be printed. This bow strength is done manually by entering data into a host computer entered and from this a corresponding signal fed to the control device.
  • the object of the invention is a stack lifting device of the type mentioned at the outset, through which automatically the lifting speed of the stacking table adjustable and a non-stop change of the sheet stack is possible without interrupting operations.
  • This object is achieved in that after switching on the stack lifting device, the stack lifting table until an upper level signal is triggered can be raised and is stable in this position, that after triggering of the upper level signal from a counter Number of sheets taken from the sheet stack up to Triggering a lower level signal countable and on corresponding signal can be fed to the control unit, that after triggering the lower level signal both the Electric motor of the stacking table by the difference in height between the certain upper and the certain lower level signal until the second triggering of the upper level signal can be raised as also from the control unit from the height difference between the upper and lower levels and the number the number of sheets counted the sheet thickness and from the sheet thickness and the stroke time a stroke speed can be determined is that as a control variable for the electric motor after the second triggering of the upper level signal for at least approximately continuous drive is controllable, the sheet surface in the further Operation largely even at the height of the top Levels are maintained and the sheet stack surface sinks below the certain upper level during the control of the electric motor at least approximately continuous drive recognizable by a
  • the at least approximately continuous way of working of the electric motor protects this and leads to considerable longer running times and longer maintenance intervals of the Electric motor.
  • a detection and automatic compensation of the sinking the sheet stacking surface below the certain one Level by pulling out the skewers of the auxiliary stacking table when the sheet stack is changed non-stop avoids business interruption.
  • the determined height measure preferably corresponds to this the thickness of the skewers of an auxiliary stacking table.
  • This specific height can be entered and entered manually the control unit can be stored.
  • an electric motor for almost continuous drive is a DC motor or a frequency-directed Three-phase motor particularly suitable.
  • a stacking lifting table 2 is attached to a stacking lifting frame 1 Lifting chains 3 suspended.
  • the lifting chains 3 are not over Sprockets shown by an electric motor 4 den
  • Stacking lift table 2 can be driven to raise or lower.
  • a stack of sheets lying on the stacking lift table 2 5 is on the stacker 1 by one Sucker symbolized sheet separation device 6 arranged by the in a certain cycle of each top sheet of the sheet stack 5 detectable and one Belt table 7 can be fed.
  • the conveyor table 7 promotes the bow then to a bow, not shown processing machine such as a printing press.
  • the sensing device 8 can a swiveling probe arm, an electrical sensor, but also an optical one that detects the height level Be a facility.
  • An electronic control unit 9 is provided by the sensing device 8 fed an upper level signal if with a lifting movement of the stack lifting table 2, the sheet stacking surface 10 reaches a certain upper level Has. Furthermore, the sensing device 8 the electronic control unit 9 a lower level signal fed when the sheet stacking surface due to sheet consumption 10 to a certain lower level has sunk.
  • Control unit 9 counts corresponding to the work cycles forwarded by one in the control unit 9 existing counters in the time between an upper one and a lower level signal can be counted.
  • control unit 9 Depending on the signals supplied to the control unit 9 the control unit 9 generates a control signal to control the electric motor 4.
  • the electric motor 4 is controlled such that it the stacking table 2 at a certain speed increases gradually or continuously until at Reaching the certain upper level through the sheet stacking surface 10 the sensing device 8 an upper Level signal generated and fed to the control unit 9. From this moment on, the counter of the control unit 9 those supported by the sheet separation unit 6 Arc counted until a lower level signal triggered by the sensing device 8 and the control unit 9 is fed.
  • This lower level signal triggers that the electric motor 4 lifts the stacking lifting table 2 relatively quickly, until the sheet stacking surface 10 the certain upper Level and a second upper level signal triggers.
  • control unit 9 from the Counter counted number of sheets and that in the control unit 9 stored height difference between the top and lower level the bow thickness as well as from the bow thickness and that also stored in the control unit 9 Cycle time determines a lifting speed.
  • This stroke speed is used as a control variable for the Electric motor 4 stored in the control unit 9.
  • the sheet stacking surface 10 sinks further Operating e.g. by a non-stop stack change, so this is detected and released by the sensing device 8 a control of the electric motor 4 from the stacking table 2 accelerates to the top Raises levels through the arch surface 10. After that the control goes back to continuous drive about.
  • the accelerated lifting movement takes place either until to trigger an upper level signal or is as a certain height measure via an input unit 11 of the Control unit 9 can be entered manually and stored in it.

Landscapes

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

Abstract

A method and apparatus for feeding sheets from a top of a sheet stack supported on a stack lifting table to a sheet processing machine. The stack lifting table supporting the sheet stack is raised by a motor until the top of the sheet stack has reached a predetermined maximum level. At this position, the sheets are fed by a feeding mechanism from the sheet stack to the sheet processing machine to lessen the stack height until the top of the sheet stack has reached a predetermined minimum level as determined by a sensor. The rate at which the stack height is lessened as sheets are fed from the stack lifting table is then determined by a controller from the known distance between the predetermined maximum and minimum levels and a value corresponding to the speed at which sheets are fed from the stack. The speed value, or sheet cycle time, may be received from the processing machine, or may be a time duration measured by a timer. The motor is then controllably operated to raise the stack lifting table at a rate corresponding to the rate at which the stack height is lessened, thereby maintaining the top of the stack at substantially the same height as sheets are fed to the sheet processing machine.

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 is drivable and from the sheet stack each top bow can be removed in a certain cycle and a sheet processing machine can be fed with a sensing device, by lifting the sheet stack and reaching a certain level of sheet stack surface an upper level signal as well as at Descent of the upper level of the sheet stacking surface below a certain lower level a lower level signal can be generated and these signals of a control unit are feedable, depending on the incoming Signals a control signal to control the Electric motor can be generated.

Bei einer derartigen bekannten Stapelhubvorrichtung (DE-A-36 31 456) 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 (DE-A-36 31 456) is the stacking stroke movement and the Work cycle determines a value that matches a given one Sheet thickness is compared. According to the deviation one of the specified sheet thickness occurs Correction of the stacking stroke movement.

Aus der EP-A-0 539 773 ist eine Steuerung für eine Stapelhubvorrichtung der eingangs genannten Art bekannt, bei der durch eine Steuervorrichtung die Stapelhubgeschwindigkeit kontinuierlich steuerbar ist. Die Ansteuerung erfolgt dabei in Abhängigkeit von der Verarbeitungsgeschwindigkeit einer Druckmaschine und der Bogenstärke der zu bedruckenden Bogen. Diese Bogenstärke wird manuell über eine Dateneingabe in einen Leitrechner eingegeben und von diesem ein entsprechendes Signal der Steuervorrichtung zugeführt.From EP-A-0 539 773 is a control for a stack lifting device of the type mentioned at the beginning, in which the stack lifting speed is controlled by a control device is continuously controllable. The control takes place depending on the processing speed a press and the sheet thickness the sheets to be printed. This bow strength is done manually by entering data into a host computer entered and from this a corresponding signal fed to the control device.

Da die tatsächliche Auftragsdicke der Bogen in einem Bogenstapel aufgrund von z.B. Bogenrauigkeit und unterschiedlicher Bogenoberfläche größer ist als die Bogenstärke, sind manuelle Korrekturen der Hubgeschwindigkeit während des Arbeitsbetriebs erforderlich.Because the actual thickness of the sheet in one Sheet stack due to e.g. Arc roughness and different Arc surface is greater than the arc thickness, are manual corrections to the lifting speed required during operation.

Aufgabe der Erfindung ist es eine Stapelhubvorrichtung der eingangs genannten Art zu schaffen, durch die selbsttätig die Hubgeschwindigkeit des Stapelhubtischs einstellbar und ein Nonstopwechsel des Bogenstapels ohne Betriebsunterbrechung möglich ist.The object of the invention is a stack lifting device of the type mentioned at the outset, through which automatically the lifting speed of the stacking table adjustable and a non-stop change of the sheet stack is possible without interrupting operations.

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 Niveainsignals 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 Niveausignal 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 nach dem zweiten Auslösen des oberen Niveausignals zum zumindest annähernd kontinuierlichen Antrieb ansteuerbar ist, wobei die Bogenoberfläche im weiteren Betrieb weitgehend gleichmäßig in der Höhe des oberen Niveaus gehalten wird sowie 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. 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 Bedienungspersonal 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 switching on the stack lifting device, the stack lifting table until an upper level signal is triggered can be raised and is stable in this position, that after triggering of the upper level signal from a counter Number of sheets taken from the sheet stack up to Triggering a lower level signal countable and on corresponding signal can be fed to the control unit, that after triggering the lower level signal both the Electric motor of the stacking table by the difference in height between the certain upper and the certain lower level signal until the second triggering of the upper level signal can be raised as also from the control unit from the height difference between the upper and lower levels and the number the number of sheets counted the sheet thickness and from the sheet thickness and the stroke time a stroke speed can be determined is that as a control variable for the electric motor after the second triggering of the upper level signal for at least approximately continuous drive is controllable, the sheet surface in the further Operation largely even at the height of the top Levels are maintained and the sheet stack surface sinks below the certain upper level during the control of the electric motor at least approximately continuous drive recognizable by a sensor and the electric motor moves the stacking table by a certain amount Elevation can be controlled accelerated lifting. On this can be done easily without manual intervention of the personnel monitoring the machine Lifting speed of the stacking lifting table set automatically not only the actual sheet thickness, but also all others, variables influencing the height of the sheet stack such as e.g. the arch surface and arch roughness are taken into account will. Since the operating personnel during the start-up phase no longer intervene with new sheets needs, it is relieved and can therefore simultaneously processing a larger number of sheets Manage plants.

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 way of working of the electric motor protects this and leads to considerable longer running times and longer maintenance intervals of the Electric motor.

Ein Erfassen und selbsttätiges Kompensieren des Absinkens der Bogenstapeloberfläche unter das bestimmte Niveau durch das Herausziehen der Spieße des Hilfsstapeltischs bei einem Nonstopwechsel des Bogenstapels vermeidet eine Betriebunterbrechung. A detection and automatic compensation of the sinking the sheet stacking surface below the certain one Level by pulling out the skewers of the auxiliary stacking table when the sheet stack is changed non-stop avoids business interruption.

Vorzugsweise entspricht dabei das bestimmte Höhenmaß der Dicke der Spieße eines Hilfsstapeltischs.The determined height measure preferably corresponds to this 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 can be entered and entered manually the control unit can be stored.

Als Elektromotor zum annähernd kontinuierlichen Antrieb ist ein Gleichstrommotor oder ein frequenzgerichteter Drehstrommotor besonders geeignet.As an electric motor for almost continuous drive is a DC motor or a frequency-directed Three-phase motor particularly suitable.

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 in the drawing shown and is described in more detail below. The only figure in the drawing shows a stacking device in the 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 attached to a stacking lifting frame 1 Lifting chains 3 suspended. The lifting chains 3 are not over Sprockets shown by an electric motor 4 den Stacking lift table 2 can be driven to raise or lower.

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 stack of sheets lying on the stacking lift table 2 5 is on the stacker 1 by one Sucker symbolized sheet separation device 6 arranged by the in a certain cycle of each top sheet of the sheet stack 5 detectable and one Belt table 7 can be fed. The conveyor table 7 promotes the bow then to a bow, not shown processing machine 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, is also a sensing device 8 arranged through which the height level of the sheet stacking surface 10 is detectable. The sensing device 8 can a swiveling probe arm, an electrical sensor, but also an optical one that detects the height level Be a facility.

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 is provided by the sensing device 8 fed an upper level signal if with a lifting movement of the stack lifting table 2, the sheet stacking surface 10 reaches a certain upper level Has. Furthermore, the sensing device 8 the electronic control unit 9 a lower level signal fed when the sheet stacking surface due to sheet consumption 10 to a certain lower level has sunk.

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 separation device 6 the Control unit 9 counts corresponding to the work cycles forwarded by one in the control unit 9 existing counters in the time between an upper one and a lower level signal can be counted.

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 to control 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.Is on the stacking table moved to its lower position 2 a new sheet stack 5 with sheets not known Thickness has been applied by the control unit 9 the electric motor 4 is controlled such that it the stacking table 2 at a certain speed increases gradually or continuously until at Reaching the certain upper level through the sheet stacking surface 10 the sensing device 8 an upper Level signal generated and fed to the control unit 9. From this moment on, the counter of the control unit 9 those supported by the sheet separation unit 6 Arc counted until a lower level signal triggered by the sensing device 8 and the control unit 9 is fed.

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 stacking lifting table 2 relatively quickly, until the sheet stacking surface 10 the certain upper Level and a second upper level signal triggers.

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 that in the control unit 9 stored height difference between the top and lower level the bow thickness as well as from the bow thickness and that also stored in the control unit 9 Cycle time determines a lifting speed.

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 saved, you can use the control unit also from those fed to the meter Pulse of the sheet separation device determined will.

Diese Hubgeschwindigkeit wird als Ansteuergröße für den Elektromotor 4 in der Steuereinheit 9 gespeichert.This stroke speed is used as a control variable for the Electric motor 4 stored 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 after the second triggering of the upper level signal with the control variable acted on in such a way that this further at least approximately continuous drive can be controlled and the sheet stacking surface 10 in continued operation largely even at the height of the upper level holds.

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.The sheet stacking surface 10 sinks further Operating e.g. by a non-stop stack change, so this is detected and released by the sensing device 8 a control of the electric motor 4 from the stacking table 2 accelerates to the top Raises levels through the arch surface 10. After that the control goes back to continuous drive about.

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

Claims (4)

  1. Pile lifting device with a pile lifting table (2) carrying a sheet pile (5) which is drivable liftably and lowerably by an electric motor (4) and from the sheet pile (5) of which the respective uppermost sheet can be moved in a given rhythm and fed to a sheet processing machine, with a sensing device (8) by which, on lifting the sheet pile and reaching a predetermined level for the sheet pile surface (10), an upper level signal can be generated as well as on sinking the upper level of the sheet pile surface (10), a lower level signal below a given lower level and these signals can be fed to a control unit, by which in dependence on the fed in signals a control signal can be generated to control the electric motor (4), characterised in that after switching on the pile lifting device, the pile lifting table (2) can be raised until an upper level signal is triggered and can be held in this position, that after triggering of the upper level signal, the number of sheets taken from the sheet pile (5) can be counted by a counter until the triggering of a lower level signal and a corresponding signal can be fed to the control unit (9), that after triggering of the lower level signal, both the electric motor (4) of the pile lifting table (2) can be controlled so that it can be lifted through the height difference between the determined upper and the determined lower level up to the second triggering of the upper level, and also by the control unit (9) from the height difference between the upper and lower level and the number of the counted sheets, the sheet thickness, as well as from the sheet thickness and the cycle time, a lifting speed can be determined, which can be stored as a control value for the electric motor (4), and with which the electric motor (4) after the second triggering of the upper level signal can be controlled to at least substantially continuous drive, whereby the sheet pile surface (10) in further operation is held substantially evenly at the height of the upper level as well as sinking of the sheet pile surface (10) below the given level during the control of the electric motor (4) to at least substantially continuous drive can be detected by a sensor and the electric motor (4) can be controlled to lift the pile lifting table (2) by a given height amount in accelerated fashion.
  2. Pile lifting device according to Claim 1, characterised in that the given height amount corresponds to the thickness of the prongs of an auxiliary pile table.
  3. Pile lifting device according to Claim 2, characterised in that the given height amount can be input manually and is storable in the control unit (9).
  4. Pile lifting device according to one of the preceding Claims, characterised in that the electric motor (4) is a direct current motor or a frequency controlled alternating current 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
DE4410384 1994-03-25
DE4410384A DE4410384C1 (en) 1994-03-25 1994-03-25 Control for stack lift device

Publications (3)

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

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Application Number Title Priority Date Filing Date
EP95104010A Expired - Lifetime EP0673865B1 (en) 1994-03-25 1995-03-18 Pile elevating device

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US (1) US5556252A (en)
EP (1) EP0673865B1 (en)
JP (1) JP2825775B2 (en)
AT (1) ATE167845T1 (en)
DE (2) DE4410384C1 (en)

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Also Published As

Publication number Publication date
EP0673865A3 (en) 1996-03-20
DE4410384C1 (en) 1995-05-24
US5556252A (en) 1996-09-17
DE59502665D1 (en) 1998-08-06
JPH07267387A (en) 1995-10-17
EP0673865A2 (en) 1995-09-27
ATE167845T1 (en) 1998-07-15
JP2825775B2 (en) 1998-11-18

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