EP0897884B1 - Lifting drive for an automatic pile changing device - Google Patents

Lifting drive for an automatic pile changing device Download PDF

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Publication number
EP0897884B1
EP0897884B1 EP98113067A EP98113067A EP0897884B1 EP 0897884 B1 EP0897884 B1 EP 0897884B1 EP 98113067 A EP98113067 A EP 98113067A EP 98113067 A EP98113067 A EP 98113067A EP 0897884 B1 EP0897884 B1 EP 0897884B1
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EP
European Patent Office
Prior art keywords
drive
stack
pile
auxiliary
control
Prior art date
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Expired - Lifetime
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EP98113067A
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German (de)
French (fr)
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EP0897884A1 (en
Inventor
Hartmut Leichnitz
Michael Dotzert
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Manroland AG
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MAN Roland Druckmaschinen AG
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Publication of EP0897884A1 publication Critical patent/EP0897884A1/en
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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
    • B65H1/30—Supports or magazines for piles from which articles are to be separated with means for replenishing the pile during continuous separation of articles therefrom
    • 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
    • B65H2403/00—Power transmission; Driving means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/10—Speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
    • B65H2557/30—Control systems architecture or components, e.g. electronic or pneumatic modules; Details thereof
    • B65H2557/31—Control systems architecture or components, e.g. electronic or pneumatic modules; Details thereof for converting, e.g. A/D converters
    • 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

Definitions

  • the invention relates to a lifting drive for an automatic stack changing device according to the preamble of claim 1.
  • the sheets to be printed are printed by the Top of a stack of feeders taken to a system via a conveyor table transported.
  • substrate thicknesses of up to processed on the order of 1 mm and also with a high printing speed conveyed by the machine are the Stack in the feeder of the machine processed relatively quickly.
  • To the production pressure To be able to continue without interruption, it is necessary to place a new stack on the To provide stack support plate, i.e. this new stack exactly in the same Position below the remaining stack (previously processed stack) and then combine the remaining stack with the new main stack.
  • Both the investor's stack support plate receiving the main stack and the auxiliary stack support device arranged upstream of the feeder each have a lifting device with their own drive.
  • a stack height scanner in the feeder Form a suitable sensor arranged, the corresponding signals can be removed and can be fed to a controller assigned to the respective drive are.
  • a working point can be selected through the control upstream of the drives. i.e. the switch-on frequency and the switch-on lengths depend on Work cycle of the machine and the substrate thickness selected. With large substrates as well as a high work cycle of the machine (high printing speed) accordingly, the drives for the main stack and the auxiliary stack support device accordingly more often and also for a longer period of time switched on.
  • the auxiliary stack support device Due to the interaction of an auxiliary stack support device with the feeder or the main stack located on the pallet of the stack support plate necessary, the auxiliary stack support device with the horizontal one and inside extendable support rods synchronized with the stack support plate for longer periods or the top of the pallet receiving the main stack.
  • This synchronism of the lifting movements of the auxiliary stack support device or the rods with the pallet is particularly necessary to the rods in suitable moment between the top of the pallet and the bottom of the Retract the main stack and then the auxiliary stack support device synchronously to move up to the time point until the main stack is on a designated Level is processed and the stacking support plate with the pallet for loading a new main stack is lowered.
  • the drives of the lifting device for the stack support plate (main stack) and the Auxiliary stacking devices are in accordance with those to be lifted and lowered Loads are designed differently, both electrically and mechanically. To the required synchronism with regard to the lifting movements between the auxiliary stack support device and to achieve the pallet on the stack support plate technically complex precautions must therefore be taken. Because through the Lifting devices of the auxiliary stack support device or the stack support plate of the Main stack but different loads have to be moved are in particular the mechanical components of this lifting device differ. This is true both for the corresponding traction means and for those between the electrical ones Drives and gearboxes arranged to.
  • auxiliary stack support device for a given movement of the main stack (the stack support plate of the main stack) it is possible to Drive of the auxiliary pile support device of the movement of the drive of the feeder (Stack support plate), i.e. by appropriate sensory means to detect this movement and corresponding control commands for driving the Generate auxiliary pile carrier.
  • Another option is while the synchronous process the drive of the auxiliary stack support device via suitable Control algorithms controlled by the sensor of the stack height scanning. To do this, however, it is necessary to add an additional stack height sensor Way with regard to the conditions of the drive of the auxiliary stack support device evaluate and generate appropriate control commands. This can only be done take place when the drive of the auxiliary stack support device an additional control with evaluation of the sensor signals or if the sensor signals evaluating control with appropriate computing capacity is.
  • DE 44 18 810 C1 and DE 195 16 582 are devices with main and Auxiliary stack carrier known, with both the main and the auxiliary stack carrier over assigned drives can be moved. This is done via a stack height scan Detect the height of the top sheet on the stack so that over a assigned control main and auxiliary stacks can be combined.
  • the lifting devices of the stack support plate of the main stack or the auxiliary stack support device-associated drive controls are parameterized such that both the stack support plate of the main stack as well as the auxiliary stack support device with the same long switch-on times are moved by the same strokes.
  • the invention is the electric drive control for the Lift drive of the auxiliary stack carrier parameterized in such a way that by the corresponding Drive in all operating points with the same switch-on time as for the Drive the main stack the auxiliary stack support the same stroke (path) travels.
  • the synchronization provided according to the invention by means of appropriate parameter selection has not only the advantage that both the drive for the Main stack as well as that for the auxiliary stack support device of one each long switching signal generating control can be operated, but that it is also possible that the switching signals at different times feed the respective drive. So the drives in the other operating modes one controller in a completely independent manner relative to each other be moved.
  • the operating situations are addressed here, if the auxiliary stack support device for moving to a predetermined position with a higher one Speed down or up and the stack support plate of the Main stack according to the signals of the stack height sensor, the clock of Following machine is moved.
  • the advantage of the invention can be seen in particular in that by only one the control of the signals of the stack height sensing (sensor) detecting both the Drive of the main stack as well as that of the auxiliary stack support device with corresponding Switching signals can be supplied.
  • main and auxiliary stack synchronous processes are made by the control for the same length of time but not necessary
  • simultaneous switch-on signals are provided, with the Corresponding parameterization of the electrical drive control of the auxiliary stack support device the same lifting distances covered by the auxiliary stack support device become as from the main stack (stack support plate).
  • the independent process the stack support plate of the main stack and the auxiliary stack support device takes place in simply by the fact that the control signals for the respective drives can be specified to be of different lengths or one or both Drives are operated with continuous switch-on signals.
  • Fig. 1 shows a sheet-fed offset printing press 1 (first printing unit), which has a Conveying table sheets are fed from a feeder 2.
  • a stack support plate 6 on a pallet 5 a stack 4, of which The top of the sheet was taken in time with the machine and over the conveyor table Plant are fed.
  • the stack support plate 6 of the stack 4 in the feeder 2 is Can be raised and lowered via a drive 7 via a lifting device (not shown).
  • An auxiliary stack support device 3 is assigned to the feeder 2, which as a along guide rails 10 on the feeder 2 with height-adjustable frame 8 horizontally movable support rods 9 arranged therein is formed.
  • the Support rods 9 can via drive means, not shown, according to the method of Auxiliary stack support device 3 in a predetermined height level between the bottom the stack 4 and the top of the pallet 5 for removing the stack 4 be retracted.
  • the operation and design of the support rods 9 of the Auxiliary stack support device 3 of the type shown in FIG. 1 is known per se and in the unpublished DE 197 04 285 A1 described in detail.
  • the frame 8 of the auxiliary stack support device 3 is not shown explicitly Lifting device along the guide rails 10 on the feeder 2 via a assigned drive 11 in the form of an electric motor.
  • the drive 7 for the main stack 4 of the feeder 2 and the drive 11 of the auxiliary stack support device 3 are each drive controls according to the design of the motors 12 and 13 assigned, which each have a converter / frequency converter in conjunction with a programmable controller / computer.
  • the drives 7, 11 are correspondingly predeterminable Switch-on signals energized in a suitable manner.
  • the mains connection of the drive controls 12, 13 is indicated in Figure 1.
  • the drive controls 12, 13 stand with the entire stack changing process as well as the control of the lifting movements 14 in operative connection.
  • the controller 14 is also a stack height scan 15 for the stack 4 in the feeder 2 connected in the form of a sensor.
  • the sensor Suitable signals can be taken from the stack height scan 15 precisely when if the top edge of the stack 4 is within a predetermined height level comes to rest.
  • 14 switching signals are generated by the controller generated and the drive control 12 of the stack support plate 6 of the investor 2 or via the drive control 13 of the auxiliary stack support device 3.
  • An input device 16 is also connected to the controller 14, through which an automatic batch change process with the corresponding Stroke movements of the auxiliary stack support device 3 and the retraction and extension the support rods 9 and the lifting and lowering of the stack support plate 6 of the Feeder 2 can be triggered manually.
  • the drive control 12, 13 of the drives 7, 11 of the feeder 2 or the auxiliary stack support device 3 are as programmable or parameterizable drive controls educated. By means of appropriate parameter specification it can be achieved that the drive 7, 11 which is energized by the drive control 12, 13 runs up to a specified speed with a defined ramp and then with End of the switch-on signal with a specified down-ramp (switch-off time) to come to a standstill again.
  • the drive control 13 assigned to the drive 11 of the auxiliary stack support device 3 is parameterized such that the same switch-on times of the control 14 for the drive control 12 of the feeder 2 and the drive control 13 of the Auxiliary stack support device 3 identical lifting movements of the auxiliary stack support device 3 or the stack support plate 6 of the feeder 2. This means that in the Speed-time diagrams of the corresponding drive controls 12, 13 during the same switch-on times (control 14) that of the drives 7, 11 executed movements have the same speed-time area contents.
  • FIG. 2 shows that on the part of the controller in connection with the stack height scanning 15 generated switch-on signals for the drive controls 12, 13.
  • the level of the switching signal S of the controller 14 is shown over time t. It is shown here that the switching signals S for the drive control 12th time-shifted to the switching signals S for the drive control 13 of the auxiliary stack support device are provided, but the length of the switching signals S are of equal length during the "ON" state. With those shown in Figure 2 Switching signals S are generated via the drive control 12, 13 and the drives 7, 11 of the stack support plate 6 of the feeder 2 and the auxiliary stack support device 3 same strokes.
  • FIG. 3 shows a course of the switching signals S of the controller 14 in an asynchronous Operation of drives 7, 11.
  • the drive controller 12 of the drive 7 for the feeder 2 still operated clocked, i.e. the stack support plate 6 moves in dependence the signals of the stack height scan 15 (sensor), whereas the drive control 13 a continuous switching signal S is specified so that the drive control 13 drives the drive 11 at a maximum rated speed.
  • the auxiliary stack support device 3 with a predetermined maximum Move speed.

Abstract

A lifting device for an automatic pile changing device of a sheet-processing machine, in particular for a sheet-fed offset printing machine with a non-stop feeder, having a main pile-carrying assembly and an auxiliary pile-carrying assembly which can be raised and lowered by means of a motor and an upstream drive unit. The invention allows simple and cost effective synchronization of the main pile-carrying assembly and of the auxiliary pile-carrying assembly within given tolerances. According to the invention, this is achieved by switching signals of equal duration determined by a common control unit coordinating two drive units. At least one of the drive units is assigned parameters that enable this synchronization.

Description

Die Erfindung betrifft einen Hubantrieb für eine automatische Stapelwechselvorrichtung gemäß dem Oberbegriff von Anspruch 1.The invention relates to a lifting drive for an automatic stack changing device according to the preamble of claim 1.

Bei Bogenoffsetdruckmaschinen werden die zu bedruckenden Bogen von der Oberseite eines Anlegerstapels entnommen über einen Fördertisch zu einer Anlage transportiert. Da bei Bogenoffsetdruckmaschinen Bedruckstoffstärken bis zu einer Größenordnung 1 mm verarbeitet und auch mit einer hohen Druckgeschwindigkeit durch die Maschine gefördert werden (10.000 bis 15.000 Bogen/h), sind die Stapel im Anleger der Maschine relativ schnell abgearbeitet. Um den Auflagedruck ohne Unterbrechung fortführen zu können, ist es nötig, einen neuen Stapel auf der Stapeltragplatte bereitzustellen, d.h. diesen neuen Stapel genau in der gleichen Position unterhalb des Reststapels (vorheriger abgearbeiteter Stapel) zu positionieren und sodann den Reststapel mit dem neuen Hauptstapel zu vereinigen. Zu diesem Zweck sind automatische Stapelwechselvorrichtungen entwickelt worden, vermittels denen der bis auf einen Rest abgearbeitete Stapel (Reststapel), von der Palette auf der Stapeltragplatte abgenommen und nach dem Absenken der Stapeltragplatte sowie dem Aufsetzen eines neuen Stapels wieder lagegenau auf der Oberseite eines neuen Hauptstapels aufgelegt werden kann. Diese bekannten Stapelwechselvorrichtungen arbeiten insbesondere mit horizontal verfahrbaren Stäben (Tragstäben) nach Art eines Rechens zusammen, wobei diese den Reststapel aufnehmenden Stäbe an einer vertikal verfahrbaren Hilfsstapeltragvorrichtung angebracht sind.In sheetfed offset printing machines, the sheets to be printed are printed by the Top of a stack of feeders taken to a system via a conveyor table transported. With sheetfed offset presses, substrate thicknesses of up to processed on the order of 1 mm and also with a high printing speed conveyed by the machine (10,000 to 15,000 sheets / h) are the Stack in the feeder of the machine processed relatively quickly. To the production pressure To be able to continue without interruption, it is necessary to place a new stack on the To provide stack support plate, i.e. this new stack exactly in the same Position below the remaining stack (previously processed stack) and then combine the remaining stack with the new main stack. To automatic stack changing devices have been developed for this purpose, by means of which the batch processed apart from a remainder (remainder stack) from which Pallet on the stack support plate removed and after lowering the stack support plate as well as putting on a new stack again exactly on the Top of a new main stack can be placed. These well-known Stack changing devices work in particular with horizontally movable Rods (supporting rods) together in the manner of a rake, this being the remaining stack receiving rods on a vertically movable auxiliary stack support device are attached.

Sowohl die den Hauptstapel aufnehmende Stapeltragplatte des Anlegers als auch die dem Anleger vorgeordnete Hilfsstapeltragvorrichtung weisen jeweils eine Hubvorrichtung mit eigenem Antrieb auf. Um die Oberseite des Hauptstapels bzw. des durch die Hilfsstapeltragvorrichtung gehaltenen Reststapels innerhalb eines vorgegebenen Höhenniveaus zu halten, ist im Anleger ein Stapelhöhenabtaster in Form eines geeigneten Sensors angeordnet, dem entsprechende Signale entnehmbar und einer dem jeweiligen Antrieb zugeordneten Steuerung zuführbar sind. Durch die den Antrieben vorgeordnete Steuerung ist ein Arbeitspunkt wählbar, d.h. die Einschalthäufigkeit sowie die Einschaltlängen werden abhängig vom Arbeitstakt der Maschine sowie der Bedruckstoffstärke gewählt. Bei großen Bedruckstoffstärken sowie einem hohen Arbeitstakt der Maschine (hohe Druckgeschwindigkeit) werden demzufolge die Antriebe für den Hauptstapel und die Hilfsstapeltragvorrichtung entsprechend häufiger und auch für eine längere Zeitdauer eingeschaltet.Both the investor's stack support plate receiving the main stack and the auxiliary stack support device arranged upstream of the feeder each have a lifting device with their own drive. To the top of the main stack or residual stack held by the auxiliary stack support device within a predetermined Maintaining height levels is a stack height scanner in the feeder Form a suitable sensor arranged, the corresponding signals can be removed and can be fed to a controller assigned to the respective drive are. A working point can be selected through the control upstream of the drives. i.e. the switch-on frequency and the switch-on lengths depend on Work cycle of the machine and the substrate thickness selected. With large substrates as well as a high work cycle of the machine (high printing speed) accordingly, the drives for the main stack and the auxiliary stack support device accordingly more often and also for a longer period of time switched on.

Aufgrund des Zusammenwirkens einer Hilfsstapeltragvorrichtung mit dem Anleger bzw. dem auf der Palette der Stapeltragplatte befindlichen Hauptstapels ist es nötig, die Hilfsstapeltragvorrichtung mit den darin befindlichen und horizontal einund ausfahrbaren Tragstäben über längere Zeiträume synchron mit der Stapeltragplatte bzw. der Oberseite der den Hauptstapel aufnehmenden Palette zu verfahren. Diese Synchronität der Hubbewegungen der Hilfsstapeltragvorrichtung bzw. der Stäbe mit der Palette ist insbesondere deswegen nötig, um die Stäbe im geeigneten Moment zwischen der Oberseite der Palette und der Unterseite des Hauptstapels einzufahren und daraufhin die Hilfsstapeltragvorrichtung synchron bis zu dem Zeitpunkt zu bewegen, bis der Hauptstapel auf ein vorgesehenes Niveau abgearbeitet ist und die Stapeltragplatte mit der Palette zum Beladen mit einem neuen Hauptstapel abgesenkt wird.Due to the interaction of an auxiliary stack support device with the feeder or the main stack located on the pallet of the stack support plate necessary, the auxiliary stack support device with the horizontal one and inside extendable support rods synchronized with the stack support plate for longer periods or the top of the pallet receiving the main stack. This synchronism of the lifting movements of the auxiliary stack support device or the rods with the pallet is particularly necessary to the rods in suitable moment between the top of the pallet and the bottom of the Retract the main stack and then the auxiliary stack support device synchronously to move up to the time point until the main stack is on a designated Level is processed and the stacking support plate with the pallet for loading a new main stack is lowered.

Die Antriebe der Hubvorrichtung für die Stapeltragplatte (Hauptstapel) sowie die Hilfstapeltragvorrichtung sind entsprechend der zu hebenden und zu senkenden Lasten sowohl elektrisch als auch mechanisch unterschiedlich ausgeführt. Um die erforderliche Synchronität hinsichtlich der Hubbewegungen zwischen Hilfsstapeltragvorrichtung und der auf der Stapeltragplatte befindlichen Palette zu erzielen sind demzufolge technisch aufwendige Vorkehrungen zu treffen. Da durch die Hubvorrichtungen der Hilfsstapeltragvorrichtung bzw. der Stapeltragplatte des Hauptstapels aber unterschiedliche Lasten zu bewegen sind, sind insbesondere die mechanischen Komponenten dieser Hubvorrichtung unterschiedlich. Dies trifft sowohl für die entsprechenden Zugmittel als auch für die zwischen den elektrischen Antrieben und den Zugmitteln angeordneten Getriebe zu.The drives of the lifting device for the stack support plate (main stack) and the Auxiliary stacking devices are in accordance with those to be lifted and lowered Loads are designed differently, both electrically and mechanically. To the required synchronism with regard to the lifting movements between the auxiliary stack support device and to achieve the pallet on the stack support plate technically complex precautions must therefore be taken. Because through the Lifting devices of the auxiliary stack support device or the stack support plate of the Main stack but different loads have to be moved are in particular the mechanical components of this lifting device differ. This is true both for the corresponding traction means and for those between the electrical ones Drives and gearboxes arranged to.

Um die Hilfsstapeltragvorrichtung bei einer gegebenen Bewegung des Hauptstapels (der Stapeltragplatte des Hauptstapels) nachzuführen ist es möglich, den Antrieb der Hilfsstapeltragvorrichtung der Bewegung des Antriebes des Anlegers (Stapeltragplatte) nachzuführen, d.h. durch entsprechende sensorische Mittel diese Bewegung zu erfassen und entsprechende Stellbefehle für den Antrieb der Hilfsstapeltragvorrichtung zu generieren. Dieses verkompliziert den bautechnischen Aufwand aber erheblich. Eine andere Möglichkeit besteht darin, während des Synchronverfahrens den Antrieb der Hilfsstapeltragvorrichtung über geeignete Regelalgorithmen vom Sensor der Stapelhöhenabtastung gesteuert nachzuführen. Dazu ist es aber nötig, die Stapelhöhenabtastung (Sensor) in einer zusätzlichen Weise hinsichtlich der Gegebenheiten des Antriebs der Hilfsstapeltragvorrichtung auszuwerten und entsprechende Stellbefehle zu generieren. Dies kann nur dann erfolgen, wenn dem Antrieb der Hilfsstapeltragvorrichtung eine zusätzliche Steuerung mit Auswertung der Sensorsignale vorgeordnet ist bzw. wenn die die Sensorsignale auswertende Steuerung mit einer entsprechenden Rechenkapazität versehen ist.Around the auxiliary stack support device for a given movement of the main stack (the stack support plate of the main stack) it is possible to Drive of the auxiliary pile support device of the movement of the drive of the feeder (Stack support plate), i.e. by appropriate sensory means to detect this movement and corresponding control commands for driving the Generate auxiliary pile carrier. This complicates the constructional Effort but considerable. Another option is while the synchronous process the drive of the auxiliary stack support device via suitable Control algorithms controlled by the sensor of the stack height scanning. To do this, however, it is necessary to add an additional stack height sensor Way with regard to the conditions of the drive of the auxiliary stack support device evaluate and generate appropriate control commands. This can only be done take place when the drive of the auxiliary stack support device an additional control with evaluation of the sensor signals or if the sensor signals evaluating control with appropriate computing capacity is.

Aus der DE 44 18 810 C1 sowie der DE 195 16 582 sind Einrichtungen mit Haupt- und Hilfsstapelträger bekannt, wobei sowohl der Haupt- als auch der Hilfsstapelträger über zugeordnete Antriebe verfahren werden. Über eine Stapelhöhenabtastung erfolgt die Erfassung der Höhe des obersten Bogens auf dem Stapel, so dass über eine zugeordnete Steuerung Haupt- und Hilfsstapel miteinander vereinigt werden können.DE 44 18 810 C1 and DE 195 16 582 are devices with main and Auxiliary stack carrier known, with both the main and the auxiliary stack carrier over assigned drives can be moved. This is done via a stack height scan Detect the height of the top sheet on the stack so that over a assigned control main and auxiliary stacks can be combined.

Demzufolge ist es Aufgabe der vorliegenden Erfindung einen Hubantrieb für eine automatische Stapelwechseleinrichtung gemäß dem Oberbegriff von Anspruch 1 derartig zu erweitern, so daß unter Vermeidung der zuvorstehend genannten Nachteile eine einfache und kostengünstige Möglichkeit zum synchronen Verfahren der Stapeltragplatte des Hauptstapels und der Hilfsstapeltragvorrichtung innerhalb gegebener Toleranzen möglich ist.Accordingly, it is an object of the present invention to provide a linear actuator for a automatic stack changing device according to the preamble of claim 1 to expand in such a way that avoiding the above Disadvantages of a simple and inexpensive way of synchronous processing the stack support plate of the main stack and the auxiliary stack support device is possible within given tolerances.

Gelöst wird diese Aufgabe durch die kennzeichnenden Merkmale von Anspruch 1. Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.This object is achieved by the characterizing features of claim 1. Further developments of the invention result from the subclaims.

Gemäß der Erfindung ist vorgesehen, daß die den Hubvorrichtungen der Stapeltragplatte des Hauptstapels bzw. der Hilfsstapeltragvorrichtung zugeordneten An-triebssteuerungen derartig parametriert sind, so daß sowohl die Stapeltragplatte des Hauptstapels als auch die Hilfsstapeltragvorrichtung bei gleich langen Einschaltzeiten jeweils um gleiche Hübe bewegt werden. In einem bevorzugten Ausführungsfall der Erfindung ist dabei die elektrische Antriebssteuerung für den Hubantrieb des Hilfsstapelträgers derartig parametriert, daß durch den entsprechenden Antrieb in allen Arbeitspunkten bei gleicher Einschaltzeit wie für den Antrieb des Hauptstapels die Hilfsstapeltragvorrichtung den gleichen Hub (Weg) zurücklegt. Durch diese mittels entsprechender Parameterwahl erzielbare Synchronisierung der Antriebe von Hauptstapel und Hilfsstapeltragvorrichtung ist es möglich, beiden elektrischen Antriebssteuerungen (Stapeltragplatte - Hauptstapel /- Hilfsstapeltragvorrichtung) eine gemeinsame Steuerung zuzuordnen, welche mit dem Sensor für die Stapelhöhenabtastung des Hauptstapels verbunden ist und entsprechend dem durch die Bedruckstoffstärke sowie dem Arbeitstakt der Maschine bedingten Arbeitspunkt Schaltbefehle mit gegebener Häufigkeit und vorgegebener Zeitdauer generiert. Bei entsprechender Parameterwahl in Verbindung mit den geforderten mechanischen Toleranzen hinsichtlich der Synchronität der Hubbewegung ist es dabei auch möglich, daß durch die Steuerung die Schaltbefehle für den Antrieb des Hauptstapels (Anleger) sowie der Hilfsstapeltragvorrichtung nicht zeitgleich an die entsprechenden Antriebssteuerungen (Umrichter) abgegeben werden. Demzufolge wird das Fahren der Antriebe nicht zeitsynchron erfolgen, da es nur wichtig ist, daß in bestimmten Zeitintervallen jeweils die gleichen Wege gefahren werden. Zeitverzögerungen innerhalb dieser Toleranz bei der Übertragung der Schaltsignale wirken sich dann nicht nachteilig aus.According to the invention it is provided that the lifting devices of the stack support plate of the main stack or the auxiliary stack support device-associated drive controls are parameterized such that both the stack support plate of the main stack as well as the auxiliary stack support device with the same long switch-on times are moved by the same strokes. In a preferred embodiment the invention is the electric drive control for the Lift drive of the auxiliary stack carrier parameterized in such a way that by the corresponding Drive in all operating points with the same switch-on time as for the Drive the main stack the auxiliary stack support the same stroke (path) travels. By means of this synchronization which can be achieved by means of appropriate parameter selection it is the drives of the main stack and auxiliary stack support device possible, both electrical drive controls (stack support plate - main stack / - Auxiliary stack support device) to assign a common control, which with the sensor for the stack height sensing of the main stack is connected and according to the thickness of the substrate and the machine's cycle conditional operating point switching commands with given frequency and given Duration generated. With appropriate parameter selection in connection with the required mechanical tolerances with regard to the synchronism of the lifting movement it is also possible that the switching commands by the controller for driving the main stack (feeder) and the auxiliary stack support not delivered to the corresponding drive controls (converter) at the same time become. As a result, the drives will not move synchronously, since it is only important that the same in each time interval Ways are driven. Time delays within this tolerance at the Transmission of the switching signals then has no adverse effect.

Die erfindungsgemäß vorgesehene Synchronisierung mittels entsprechender Parameterwahl hat dabei nicht nur den Vorteil, daß sowohl der Antrieb für den Hauptstapel als auch der für die Hilfsstapeltragvorrichtung von einer jeweils gleich lange Schaltsignale generierenden Steuerung bedient werden können, sondern daß es auch möglich ist, die Schaltsignale zu unterschiedlichen Zeitpunkten dem jeweiligen Antrieb zuzuführen. So können die Antriebe in den übrigen Betriebsarten von der einen Steuerung in vollkommen unabhängiger Weise relativ zueinander verfahren werden. Angesprochen sind hierbei die Betriebssituationen, wenn die Hilfsstapeltragvorrichtung zum Anfahren einer vorgegebenen Position mit höherer Geschwindigkeit herab- bzw. heraufgefahren und die Stapeltragplatte des Hauptstapels entsprechend den Signalen des Stapelhöhensensors dem Takt der Maschine folgend bewegt wird. Eine andere Betriebssituation, in denen sowohl Stapeltragplatte des Hauptstapels als auch die Hilfsstapeltragvorrichtung vollkommen unabhängig voneinander verfahren werden, ergibt sich nach dem Einfahren der Tragstäbe der Hilfsstapeltragvorrichtung zwischen Palette und Unterseite des Hauptstapels und der Übernahme des Reststapels. Danach wird der Antrieb der Hilfsstapeltragvorrichtung entsprechend den Signalen der Stapelhöhenabtastung getaktet, wohingegen zum Beladen der Stapeltragplatte des Anlegers diese vorzugsweise mit erhöhter Geschwindigkeit in eine Grundposition abgesenkt wird und nach Aufstellen eines neuen Hauptstapels mit Palette die Stapeltragplatte des Anlegers wieder hochgefahren wird.The synchronization provided according to the invention by means of appropriate parameter selection has not only the advantage that both the drive for the Main stack as well as that for the auxiliary stack support device of one each long switching signal generating control can be operated, but that it is also possible that the switching signals at different times feed the respective drive. So the drives in the other operating modes one controller in a completely independent manner relative to each other be moved. The operating situations are addressed here, if the auxiliary stack support device for moving to a predetermined position with a higher one Speed down or up and the stack support plate of the Main stack according to the signals of the stack height sensor, the clock of Following machine is moved. Another operating situation in which both Stack support plate of the main stack as well as the auxiliary stack support device completely to be moved independently of each other results after the run-in the support rods of the auxiliary stack support device between the pallet and the underside the main stack and the transfer of the remaining stack. Then the drive the auxiliary stack support device according to the signals of the stack height scan clocked, whereas for loading the stack support plate of the feeder these are preferably lowered into a basic position at increased speed and after setting up a new main stack with pallet, the stack support plate of the investor is started up again.

Der Vorteil der Erfindung ist insbesondere darin zu sehen, daß durch lediglich eine die Signale der Stapelhöhenabtastung (Sensor) erfassende Steuerung sowohl der Antrieb des Hauptstapels als auch der der Hilfsstapeltragvorrichtung mit entsprechenden Schaltsignalen versorgbar ist. In der Betriebsart "Haupt- und Hilfsstapel synchron Verfahren" werden dabei von der Steuerung gleich lange aber nicht notwendiger Weise auch zeitgleiche Einschaltsignale bereitgestellt, wobei durch die entsprechende Parametrierung der elektrischen Antriebssteuerung der Hilfsstapeltragvorrichtung durch die Hilfsstapeltragvorrichtung die gleichen Hubwege zurückgelegt werden wie vom Hauptstapel (Stapeltragplatte). Das unabhängige Verfahren der Stapeltragplatte des Hauptstapels und der Hilfsstapeltragvorrichtung erfolgt in einfacher Weise dadurch, daß durch die Steuerung die Einschaltsignale für die jeweiligen Antriebe unterschiedlich lang vorgegeben werden oder ein bzw. beide Antriebe mit kontinuierlichen Einschaltsignalen gefahren werden. The advantage of the invention can be seen in particular in that by only one the control of the signals of the stack height sensing (sensor) detecting both the Drive of the main stack as well as that of the auxiliary stack support device with corresponding Switching signals can be supplied. In the operating mode "main and auxiliary stack synchronous processes "are made by the control for the same length of time but not necessary In this way, simultaneous switch-on signals are provided, with the Corresponding parameterization of the electrical drive control of the auxiliary stack support device the same lifting distances covered by the auxiliary stack support device become as from the main stack (stack support plate). The independent process the stack support plate of the main stack and the auxiliary stack support device takes place in simply by the fact that the control signals for the respective drives can be specified to be of different lengths or one or both Drives are operated with continuous switch-on signals.

Des weiteren erfolgt die Erläuterung eines Ausführungsbeispiels der Erfindung anhand der Zeichnung. Es zeigt:

Fig. 1
einen Anleger mit einer Hilfsstapeltragvorrichtung sowie den entsprechenden Antrieben nebst Steuerung,
Fig. 2 u.3
die von der Steuerung generierter Schaltsignale zum synchronen / asynchronen Verfahren des Hauptstapels und der Hilfsstapeltragvorrichtung.
Furthermore, an embodiment of the invention is explained with reference to the drawing. It shows:
Fig. 1
a feeder with an auxiliary stack support device and the corresponding drives with control,
2 and 3
the switching signals generated by the control for synchronous / asynchronous movement of the main stack and the auxiliary stack support device.

Fig. 1 zeigt eine Bogenoffsetdruckmaschine 1 (erstes Druckwerk), der über einen Fördertisch Bogen von einem Anleger 2 zugeführt werden. Im Anleger 2 ist auf einer Stapeltragplatte 6 auf einer Palette 5 ein Stapel 4 aufgestellt, von dessen Oberseite im Takt der Maschine Bogen entnommen und über den Fördertisch der Anlage zugeführt werden. Die Stapeltragplatte 6 des Stapels 4 im Anleger 2 ist über eine nicht dargestellte Hubvorrichtung über einen Antrieb 7 heb- und senkbar.Fig. 1 shows a sheet-fed offset printing press 1 (first printing unit), which has a Conveying table sheets are fed from a feeder 2. In investor 2 is on a stack support plate 6 on a pallet 5 a stack 4, of which The top of the sheet was taken in time with the machine and over the conveyor table Plant are fed. The stack support plate 6 of the stack 4 in the feeder 2 is Can be raised and lowered via a drive 7 via a lifting device (not shown).

Dem Anleger 2 ist eine Hilfsstapeltragvorrichtung 3 zugeordnet, welche als ein entlang von Führungsschienen 10 am Anleger 2 höhenverfahrbares Gestell 8 mit darin angeordneten horizontal verfahrbaren Tragstäben 9 ausgebildet ist. Die Tragstäbe 9 können über nicht dargestellte Antriebsmittel nach Verfahren der Hilfsstapeltragvorrichtung 3 in ein vorgegebenes Höhenniveau zwischen der Unterseite des Stapels 4 und der Oberseite der Palette 5 zum Abnehmen des Stapels 4 eingefahren werden. Die Wirkungsweise und Ausbildung der Tragstäbe 9 der Hilfsstapeltragvorrichtung 3 der in Figur 1 gezeigten Art ist an sich bekannt und in der nicht vorveröffentlichten DE 197 04 285 A1 ausführlich beschrieben.An auxiliary stack support device 3 is assigned to the feeder 2, which as a along guide rails 10 on the feeder 2 with height-adjustable frame 8 horizontally movable support rods 9 arranged therein is formed. The Support rods 9 can via drive means, not shown, according to the method of Auxiliary stack support device 3 in a predetermined height level between the bottom the stack 4 and the top of the pallet 5 for removing the stack 4 be retracted. The operation and design of the support rods 9 of the Auxiliary stack support device 3 of the type shown in FIG. 1 is known per se and in the unpublished DE 197 04 285 A1 described in detail.

Das Gestell 8 der Hilfsstapeltragvorrichtung 3 ist über eine nicht explizit dargestellte Hubvorrichtung entlang der Führungsschienen 10 am Anleger 2 über einen zugeordneten Antrieb 11 in Form eines Elektromotors verfahrbar. Dem Antrieb 7 für den Hauptstapel 4 des Anlegers 2 sowie dem Antrieb 11 der Hilfsstapeltragvorrichtung 3 sind jeweils entsprechend der Ausbildung der Motore Antriebssteuerungen 12 und 13 zugeordnet, welche jeweils einen Umrichter/Frequenzumrichter in Verbindung mit einer programmierbaren Steuerung/Rechner umfassen. Durch die Antriebssteuerung 12, 13 werden die Antriebe 7, 11 entsprechend vorgebbarer Einschaltsignale in geeigneter Weise bestromt. Der Netzanschluß der Antriebssteuerungen 12, 13 ist in Figur 1 angedeutet.The frame 8 of the auxiliary stack support device 3 is not shown explicitly Lifting device along the guide rails 10 on the feeder 2 via a assigned drive 11 in the form of an electric motor. The drive 7 for the main stack 4 of the feeder 2 and the drive 11 of the auxiliary stack support device 3 are each drive controls according to the design of the motors 12 and 13 assigned, which each have a converter / frequency converter in conjunction with a programmable controller / computer. By the drive control 12, 13, the drives 7, 11 are correspondingly predeterminable Switch-on signals energized in a suitable manner. The mains connection of the drive controls 12, 13 is indicated in Figure 1.

Die Antriebssteuerungen 12, 13 stehen mit einer den gesamten Stapelwechselvorgang als auch das Nachführen der Hubbewegungen vornehmenden Steuerung 14 in Wirkverbindung. Mit der Steuerung 14 ist ferner eine Stapelhöhenabtastung 15 für den Stapel 4 im Anleger 2 in Form eines Sensors verbunden. Dem Sensor der Stapelhöhenabtastung 15 sind dabei geeignete Signale genau dann entnehmbar, wenn die Oberkante des Stapels 4 innerhalb eines vorgegebenen Höhenniveaus zum Liegen kommt. Entsprechend werden durch die Steuerung 14 Schaltsignale generiert und der Antriebssteuerung 12 der Stapeltragplatte 6 des Anlegers 2 bzw. über die Antriebssteuerung 13 der Hilfstapeltragvorrichtung 3 zugeführt. Mit der Steuerung 14 steht ferner noch eine Eingabevorrichtung 16 in Verbindung, durch welche ein automatischer Stapelwechselvorgang mit den entsprechenden Hubbewegungen der Hilfsstapeltragvorrichtung 3 und dem Ein- und Ausfahren der Tragstäbe 9 sowie das Heben und Senken der Stapeltragplatte 6 des Anlegers 2 manuell auslösbar ist.The drive controls 12, 13 stand with the entire stack changing process as well as the control of the lifting movements 14 in operative connection. With the controller 14 is also a stack height scan 15 for the stack 4 in the feeder 2 connected in the form of a sensor. The sensor Suitable signals can be taken from the stack height scan 15 precisely when if the top edge of the stack 4 is within a predetermined height level comes to rest. Correspondingly, 14 switching signals are generated by the controller generated and the drive control 12 of the stack support plate 6 of the investor 2 or via the drive control 13 of the auxiliary stack support device 3. An input device 16 is also connected to the controller 14, through which an automatic batch change process with the corresponding Stroke movements of the auxiliary stack support device 3 and the retraction and extension the support rods 9 and the lifting and lowering of the stack support plate 6 of the Feeder 2 can be triggered manually.

Die Antriebssteuerung 12, 13 der Antriebe 7, 11 des Anlegers 2 bzw. der Hilfsstapeltragvorrichtung 3 sind als programmierbare bzw. parametrierbare Antriebssteuerungen ausgebildet. Durch entsprechende Parametervorgabe ist dabei erzielbar, daß der jeweils von der Antriebssteuerung 12, 13 bestromte Antrieb 7, 11 mit einer definierten Rampe auf eine vorgegebene Drehzahl hochläuft um dann mit Ende des Einschaltsignals mit einer vorgegebenen Abtourrampe (Ausschaltzeit) wieder zum Stillstand zu kommen.The drive control 12, 13 of the drives 7, 11 of the feeder 2 or the auxiliary stack support device 3 are as programmable or parameterizable drive controls educated. By means of appropriate parameter specification it can be achieved that the drive 7, 11 which is energized by the drive control 12, 13 runs up to a specified speed with a defined ramp and then with End of the switch-on signal with a specified down-ramp (switch-off time) to come to a standstill again.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist vorgesehen, daß der dem Antrieb 11 der Hilfsstapeltragvorrichtung 3 zugeordnete Antriebssteuerung 13 derartig parametriert ist, daß sich durch die gleichen Einschaltzeiten der Steuerung 14 für die Antriebssteuerung 12 des Anlegers 2 und die Antriebssteuerung 13 der Hilfsstapeltragvorrichtung 3 gleiche Hubbewegungen der Hilfsstapeltragvorrichtung 3 bzw. der Stapeltragplatte 6 des Anlegers 2 ergeben. Dies bedeutet, daß in den Drehzahl-Zeitdiagrammen der entsprechenden Antriebssteuerungen 12, 13 während der gleichlangen Einschaltzeiten (Steuerung 14) die von den Antrieben 7, 11 ausgeführten Bewegungen die gleichen Drehzahl-Zeitflächeninhalte aufweisen.According to a preferred embodiment of the invention it is provided that the drive control 13 assigned to the drive 11 of the auxiliary stack support device 3 is parameterized such that the same switch-on times of the control 14 for the drive control 12 of the feeder 2 and the drive control 13 of the Auxiliary stack support device 3 identical lifting movements of the auxiliary stack support device 3 or the stack support plate 6 of the feeder 2. This means that in the Speed-time diagrams of the corresponding drive controls 12, 13 during the same switch-on times (control 14) that of the drives 7, 11 executed movements have the same speed-time area contents.

Figur 2 zeigt die seitens der Steuerung in Verbindung mit der Stapelhöhenabtastung 15 generierten Einschaltsignale für die Antriebssteuerungen 12, 13. Dargestellt ist über die Zeit t der Pegel des Schaltsignales S der Steuerung 14. Wiedergegeben ist dabei, daß die Schaltsignale S für die Antriebssteuerung 12 zeitversetzt zu den Schaltsignalen S für die Antriebssteuerung 13 der Hilfsstapeltragvorrichtung bereitgestellt werden, wobei jedoch die Länge der Schaltsignale S während des Zustandes "EIN" gleich lang sind. Mit den in Figur 2 dargestellten Schaltsignalen S werden über die Antriebssteuerung 12, 13 und die Antriebe 7, 11 von der Stapeltragplatte 6 des Anlegers 2 und der Hilfsstapeltragvorrichtung 3 die gleichen Hubwege ausgeführt.Figure 2 shows that on the part of the controller in connection with the stack height scanning 15 generated switch-on signals for the drive controls 12, 13. The level of the switching signal S of the controller 14 is shown over time t. It is shown here that the switching signals S for the drive control 12th time-shifted to the switching signals S for the drive control 13 of the auxiliary stack support device are provided, but the length of the switching signals S are of equal length during the "ON" state. With those shown in Figure 2 Switching signals S are generated via the drive control 12, 13 and the drives 7, 11 of the stack support plate 6 of the feeder 2 and the auxiliary stack support device 3 same strokes.

Figur 3 zeigt einen Verlauf der Schaltsignale S der Steuerung 14 bei einem asynchronen Betrieb der Antriebe 7, 11. In der hier dargestellten Betriebsart wird über die Steuerung 14 die Antriebssteuerung 12 des Antriebes 7 für den Anleger 2 weiterhin getaktet betrieben, d.h. die Stapeltragplatte 6 bewegt sich in Abhängigkeit der Signale der Stapelhöhenabtastung 15 (Sensor), wohingegen der Antriebssteuerung 13 ein kontinuierliches Schaltsignal S vorgegeben wird, so daß die Antriebssteuerung 13 den Antrieb 11 mit einer maximalen Nenndrehzahl fährt. In diesem Falle wird die Hilfsstapeltragvorrichtung 3 mit einer vorgegebenen maximalen Geschwindigkeit verfahren. Figure 3 shows a course of the switching signals S of the controller 14 in an asynchronous Operation of drives 7, 11. In the operating mode shown here, over the controller 14 the drive controller 12 of the drive 7 for the feeder 2 still operated clocked, i.e. the stack support plate 6 moves in dependence the signals of the stack height scan 15 (sensor), whereas the drive control 13 a continuous switching signal S is specified so that the drive control 13 drives the drive 11 at a maximum rated speed. In In this case, the auxiliary stack support device 3 with a predetermined maximum Move speed.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
BogendruckmaschineSheetfed
22
Anlegerinvestor
33
HilfsstapeltragvorrichtungAuxiliary pile carrier device
44
Stapelstack
55
Palettepalette
66
StapeltragplattePile carrier plate
77
Antrieb (Stapeltragplatte 6)Drive (stacking support plate 6)
88th
Gestell (Hilfsstapeltragvorrichtung 3)Frame (auxiliary stack support 3)
99
Tragstäbecarrying bars
1010
Führungsschiene (Hilfsstapeltragvorrichtung 3)Guide rail (auxiliary stack support device 3)
1111
Antrieb (Hilfsstapeltragvorrichtung 3)Drive (auxiliary stack support 3)
1212
Antriebssteuerung (Antrieb 7)Drive control (drive 7)
1313
Antriebssteuerung (Antrieb 11)Drive control (drive 11)
1414
Steuerungcontrol
1515
StapelhöhenabtastungStack height sensing
1616
Eingabevorrichtunginput device
SS
Schaltsignalswitching signal
tt
Zeittime

Claims (4)

  1. Lifting drive for an automatic pile change device of a sheet processing machine, particularly for an offset sheet printing press with non-stop feeder, with a pile carrying plate (6) in the feeder which is liftable and lowerable via a drive (7) and previously arranged drive control (12) and an auxiliary pile carrier device (3) which can be lifted and lowered via a drive (11) and a pre-arranged drive control (13), wherein the drive controls (12, 13) are operationally connected with a control (14) detecting the signals of a pile height sensing (15) cooperating with the pile on the pile carrier plate, characterised in that the drive controls (12, 13) fitted to the drives (7, 11) are constructed as converters provided in each case with a programmable computer, that for synchronous moving of the pile carrier plate (6) and the auxiliary pile carrier device (3) by means of the control (14) switching signals (S) of the same duration can be provided to the drive controls (12, 13) and that one of the drive controls (12, 13) has a parameterisation matching the rotational speed time behaviour in such a way that during a switching signal (S) from the load (6, 3) driven by the respective drive (7, 11), the same lifting movement can be called up as from the load of the second drive (7, 11).
  2. Lifting drive according to Claim 1, characterised in that by means of the control (14) during the synchronous movement of the pile carrier plate (6) and of the auxiliary pile carrying device (3), similar length switching-on signals (S) can be generated time delayed with respect to each other corresponding to the signals of the pile height detection (15).
  3. Lifting drive according to Claim 1 or 2, characterised in that by the control (14) differential switching signals (S) can be fed to move the pile carrier plate (6) of the feeder (2) and to the auxiliary pile carrier device (3) in an asynchronous mode of operation of the drive controls (12, 13).
  4. Lifting drive according to one of the preceding Claims, characterised in that the drive control (13) of the auxiliary pile carrier device (3) has parametrisation relating to the rotational speed-time behaviour of the drive (11).
EP98113067A 1997-08-19 1998-07-14 Lifting drive for an automatic pile changing device Expired - Lifetime EP0897884B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19735895A DE19735895C1 (en) 1997-08-19 1997-08-19 Lifting drive for automatic stack changer for offset sheet printing machine
DE19735895 1997-08-19

Publications (2)

Publication Number Publication Date
EP0897884A1 EP0897884A1 (en) 1999-02-24
EP0897884B1 true EP0897884B1 (en) 2002-09-04

Family

ID=7839401

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Country Status (5)

Country Link
US (1) US6142463A (en)
EP (1) EP0897884B1 (en)
JP (1) JPH11116076A (en)
AT (1) ATE223344T1 (en)
DE (2) DE19735895C1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998034866A1 (en) * 1997-02-05 1998-08-13 Man Roland Druckmaschinen Ag Stack changing device
NL1012923C2 (en) * 1999-08-27 2001-02-28 Ocu Technologies B V Sheet depositing device for selectively depositing sheets on superimposed carriers.
US6290225B1 (en) * 1999-11-23 2001-09-18 Xerox Corporation Systems and methods for dynamically setting stack height and sheet acquisition time
US6698747B2 (en) * 2001-02-06 2004-03-02 Heidelberger Druckmaschinen Ag Method and system for providing sheet stack level control
DE102004002307A1 (en) 2003-02-03 2004-08-12 Heidelberger Druckmaschinen Ag Procedure for synchronisation of movement sequences of main and additional piles of printed material in sheet feeder entails additional pile control unit receiving from main pile control unit start signal to move additional pile

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD115336A1 (en) * 1974-03-28 1975-09-20
DE4410384C1 (en) * 1994-03-25 1995-05-24 Roland Man Druckmasch Control for stack lift device
DE4418810C1 (en) * 1994-05-30 1995-11-30 Roland Man Druckmasch Method for combining main and auxiliary stacks in feeder
DE19516582C2 (en) * 1995-05-05 1997-03-06 Kba Planeta Ag Device for combining a remaining sheet stack with a main sheet stack
US5626335A (en) * 1996-02-01 1997-05-06 Marquip, Inc. Vertical lift system for delivering sheets in stacks

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ATE223344T1 (en) 2002-09-15
DE59805386D1 (en) 2002-10-10
JPH11116076A (en) 1999-04-27
DE19735895C1 (en) 1998-09-10
US6142463A (en) 2000-11-07
EP0897884A1 (en) 1999-02-24

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