EP1726548B1 - Method and device for controlling a tension in a running web in a web processing device - Google Patents

Method and device for controlling a tension in a running web in a web processing device Download PDF

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Publication number
EP1726548B1
EP1726548B1 EP06113905A EP06113905A EP1726548B1 EP 1726548 B1 EP1726548 B1 EP 1726548B1 EP 06113905 A EP06113905 A EP 06113905A EP 06113905 A EP06113905 A EP 06113905A EP 1726548 B1 EP1726548 B1 EP 1726548B1
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EP
European Patent Office
Prior art keywords
web
holding means
drawing element
motor
conveying
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Not-in-force
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EP06113905A
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German (de)
French (fr)
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EP1726548A1 (en
Inventor
Harald Gretsch
Reinhard Gross
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Koenig and Bauer AG
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Koenig and Bauer AG
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Publication of EP1726548A1 publication Critical patent/EP1726548A1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H45/00Folding thin material
    • B65H45/12Folding articles or webs with application of pressure to define or form crease lines
    • B65H45/28Folding in combination with cutting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00Registering, tensioning, smoothing or guiding webs
    • B65H23/04Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/18Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
    • B65H23/188Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
    • B65H23/1888Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web and controlling web tension
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00Dynamic entities; Timing aspects
    • B65H2513/10Speed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/30Forces; Stresses
    • B65H2515/31Tensile forces

Definitions

  • the invention relates to a method and a device for regulating the web tension of a moving web in a web-processing apparatus according to the preamble of claim 1 or 14.
  • the web tension in front of the holding means, in particular between feeder and holding means too high, so there is a risk that the material web tears on the holding means or, even worse, that the web even tears off. If the material web breaks free on the holding means, then it is damaged at least at those points where the holding means grip the material web. On the other hand, if the material web tears off, this leads to stoppages in the device, for the elimination of which a great deal of time must be expended, which in turn leads to production losses and financial expenditures. On the other hand, if the web tension is too low, there is a risk of congestion of the material web in the device, which also leads to a pusher. In order to avoid tampers or breaks or tears of the material web, the same amount of material per unit time of the device must be supplied on average as are dissipated by it.
  • the web tension between the feeder and the holding means can be regulated.
  • the feeder is designed as a pair of draw rollers, wherein the regulation of the web tension is achieved by adjusting the rotational speed of the draw rollers.
  • the regulation is directed. Neither is one Optimum value for the web tension indicated or which distinguishes such, nor can the font be removed, by which a deviation of the web tension is detected by the optimum or desired value.
  • the basic requirement for regulating the web tension to a target value is that the actual value of the web tension can be measured accurately and with time resolution.
  • the detection of the actual value of the web tension is technically quite difficult to perform.
  • Known devices for detecting the web tension such as web tension measuring rollers or web tension sensors determine the actual value of the web tension usually indirectly over the elongation of the web or phase differences between the feeder and the holding means. For example, in the EP 0 951 993 A1 followed such a path to control the web tension. Indirect detection of the actual value of the web tension, however, is associated with relatively large inaccuracies.
  • the uncertain knowledge of the actual web tension in turn has an unfavorable effect on the regulation of the web tension, since the exact knowledge of the actual value of the web tension is indispensable for achieving an exact and reliable control.
  • the DE 42 38 387 A1 discloses a method for cutting register control in a plano boom of a rotary printing machine with a feeder, a separating device and a conveying roller.
  • the feeder and the feed roller are each controlled by independent control circuits with respect to an angular position of an upstream printing unit.
  • the control is carried out in each case to be maintained relative to the printing unit angular positions, wherein in case of deviation of the actual from the target angular position in an inner loop, the power supply of the respective drive is controlled.
  • the DE 37 35 303 C2 shows a folder with a feeder, a separating device and a point needles folding blade cylinder.
  • DD 33 320 discloses a folder with a jaw-folding jaw cylinder.
  • the invention has for its object to provide a method and apparatus for controlling the web tension of a moving web in a web-processing apparatus.
  • a periodic variation of such a size is used to control the web tension.
  • the variation of such a quantity is not representative of the web tension in the sense that a web tension could be uniquely calculated from a measurement of this variation.
  • the special case of vanishing (or almost vanishing) web tension in the present case is reliably recognizable by the fact that also variations in the web tension, which are due to periodic processes in the cutting device, such as the cutting of the web itself or the gripping of the tail, tend to disappear.
  • the decision as to whether a measurand varies or not is generally much easier and more reliable to make than whether a measurand is a given given given Has value.
  • the periodic variations of any quantity representative of the web tension exceed a limit, it can be concluded that the web tension is too great. In order to lower the web tension, therefore, the average drive power delivered by the drive to the feeder is increased, so that the web of material is retracted by the feeder faster. If the web retracted faster, the web tension between feeder and holding means is reduced. However, this also reduces the periodic variations of the variable representative of web tension. If the periodic variations fall below the limit again or if they disappear, the desired web tension is reached again and the drive power can be kept constant again.
  • Reliability and sensitivity are particularly good when only those periodic variations in web tension are taken into account whose period coincides with that of cutting the web. Voltage fluctuations due to other causes or disturbances are thus ignored.
  • the size representative of the web tension can be chosen to be that representative of the power output by the engine is. Such sizes are particularly easy and without further record additional device measures.
  • the quantity representative of the power output by the engine is very particularly preferably the current strength of the operating current absorbed by the motor.
  • the device may, for example, have a display on which control measures and / or effects of the control are displayed. This also allows operators of the device to monitor the operation of the device.
  • the feeder is preferably a pair of draw rollers.
  • the holding means is preferably on a transport cylinder of a folder, z. B. designed as a collection cylinder arranged.
  • the holding means may be, for example, a gripper or a jaw or a spur strip with puncture needles.
  • the device moreover preferably comprises a cutting cylinder cooperating with the collecting cylinder at the cutting point. In such a device, both the collecting cylinder and the cutting cylinder are rotatably mounted.
  • the drawn-in material web is taken between the intake and cutting point of the holding means, taken along rotation of the collecting cylinder, wherein the holding means passes through the cutting point, and then cut at the cutting point now located between the intake and holding means cooperating with the collecting cylinder cutting cylinder.
  • the material section thus obtained is still held by the holding means. He is further promoted by the rotating cylinder collector and later derived from known facilities either immediately from the collecting cylinder or only after a predetermined number of revolutions of the collecting cylinder. In this case, with each revolution of the collecting cylinder, a new material section on the already on the collecting cylinder resting material portion placed to form a stack with a predetermined number of sections of material, so that finally this stack is derived from the collecting cylinder.
  • the device is a folder of a printing press, in particular a web-fed rotary printing press.
  • folding device 01 include a transport cylinder 02, in particular designed as a collecting cylinder 02, a cutting cylinder 03, a tension element 04), z. B. a feeder 04, in particular a pull roller pair 04, a motor 06, a control unit 07 and a display 18, for. B. a screen 18.
  • On collecting cylinder 02 holding means 14, in particular mandaturolinn 14 are arranged with puncturing needles.
  • the collecting cylinder 02 and the cutting cylinder 03 are set against each other and define a cutting gap 16 and cutting point 16, in the following also gap 16.
  • Both the collecting cylinder 02 and the cutting cylinder 03 are rotatably mounted. They rotate in the direction indicated by an arrow.
  • the Switzerlandwalzencru 04 is driven by the engine 06, in turn, by the control unit 07 is controlled.
  • a screen 18 may be connected, to which the control unit 07 can output data.
  • Preceding the folder 01 are in the printing press a roller 09, z. B. a funnel inlet roller 09 with a hired to this roller 11, z. B. a pressure roller 11 or pressure roller 11.
  • a former 12 is arranged between the rollers 09; 11 and the folder 01.
  • the term "paper web 08" or “longitudinally folded paper web 08" is representative of a strand of several successive paper webs 08 or longitudinally folded paper webs 08.
  • the paper web 08 is pulled through the driven by the motor 06 Switzerlandwalzencru 04.
  • a drive power is delivered from the motor 06 to the Werwalzencru 04, which exerts a pulling force and on the expiring of the Wegwalzencru 04 paper web 08 a thrust according to this drive power to the incoming paper train 08 in the Werwalzencru 04.
  • the size of the output from the engine 06 drive power is controlled by the control unit 07.
  • the cutting cylinder rotates in the direction of the arrow 03 arranged cutting blade 17, the gap 16 and intersects in cooperation with the collecting cylinder 02 a material section 13, in particular paper section 13 of the paper web 08 from.
  • material section 13 is also to be understood as the section of a multi-layer strand section.
  • the gap 16 is a cutting point of the folder 01.
  • the operating current of the motor 06 is monitored by the control unit 07 for the occurrence of such periodic variations. Once such periodic variations of the operating current occur and exceed a certain limit, the control unit 07 concludes that the web tension in the paper web 08 between the Werwalzencru 04 and the spur 14 is too large. In order to reduce the web tension, the control unit 07 controls the rotational speed of the motor 06 in such a way that the drive power or rotational speed output by the pulling roller pair 04 on the paper web 08 in the direction of pulling in increases. As a result, however, the overfeed of the puncture strips 14 with respect to the draw roller pair 04 is lowered, so that the paper web 08 is stretched less between the ceremoniurologyn 14 and the Switzerlandwalzencru 04 and the web tension of the paper web 08 therefore less fails.
  • control unit 07 continuously outputs data on the periodic variations and the output from the engine 06 speed and / or drive power to the screen 18 on which these are displayed for information from the press operator.
  • the motor 06 or its drive controller (not shown) by a machine control set a target speed.
  • this target speed is now superimposed on the machine speed by the method or the control unit 07 an offset, so that the periodic variations in o. G. Be reduced.
  • the stepping up of the direction and total size of this offset can be done step-by-step in an iterative procedure.
  • the control unit 07 whenever a disappearing tension has been maintained for a predetermined period of time, slightly reduces the power of the motor 06. (Or in below mentioned second embodiment, the target speed or power for the drive of the transport cylinder 02 or of the folder 01 increases.) This leads to the fact that the feeder runs slower and possibly an existing overfeed is reduced. Once the overfeed has been removed, a non-zero tensile stress reoccurs, and the controller 07 again begins to control this tension to zero.
  • a tension element 04 ' (eg, tension roller 04') arranged in the strand path between the former 12 and the folder 01 is used instead of the intake 04 and taken into account in accordance with the above explanations.
  • a tension element 04 ' can also be several draw rollers 04' used in or their motors 06 'and considered accordingly in the controller 07 ( Figure 2).
  • the procedure or the control unit 07 may be executed independently, or part of a train 08 elsewhere, z. B. in front of the hopper 12, in particular in front of a catchment work, respect. Its voltage regulating web tension control device.

Landscapes

  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)

Abstract

Method for controlling the tension of a web (08) in a web-processing device (01) comprises controlling the tension of the web between a traction mechanism (04) and a holder (14) whilst periodically varying a parameter representing the web tension and changing the transport speed of the traction mechanism and holder so that the parameter of the periodic variation decreases. An independent claim is also included for a device for controlling the tension of a web in a web-processing device. Preferred Features: The transport speeds are changed relative to each other when the parameter of the periodic variation of its amplitude exceeds a determined limiting value.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Regeln der Bahnspannung einer laufenden Bahn in einer bahnverarbeitenden Vorrichtung gemäß dem Oberbegriff des Anspruchs 1 oder 14.The invention relates to a method and a device for regulating the web tension of a moving web in a web-processing apparatus according to the preamble of claim 1 or 14.

Ist bei solchen Vorrichtungen die Bahnspannung vor dem Haltemittel, insbesondere zwischen Einzug und Haltemittel, zu hoch, so besteht die Gefahr, dass die Materialbahn an den Haltemitteln ausreißt oder, was noch schlimmer ist, dass die Materialbahn sogar abreißt. Reißt die Materialbahn an den Haltemitteln aus, so wird sie zumindest an denjenigen Stellen, an welchen die Haltemittel die Materialbahn ergreifen, beschädigt. Reißt die Materialbahn dagegen ab, so führt dies zu Stopfern in der Vorrichtung, zu deren Beseitigung viel Zeit aufgewendet werden muss, was wiederum zu Produktionsausfällen und finanziellen Aufwänden führt. Andererseits besteht bei zu niedriger Bahnspannung die Gefahr einer Staubildung der Materialbahn in der Vorrichtung, was ebenfalls zu einem Stopfer führt. Um Stopfer oder Aus- bzw. Abrisse der Materialbahn zu vermeiden, muss im Mittel gleichviel Material pro Zeiteinheit der Vorrichtung zugeführt wie von ihr abgeführt werden.Is in such devices, the web tension in front of the holding means, in particular between feeder and holding means, too high, so there is a risk that the material web tears on the holding means or, even worse, that the web even tears off. If the material web breaks free on the holding means, then it is damaged at least at those points where the holding means grip the material web. On the other hand, if the material web tears off, this leads to stoppages in the device, for the elimination of which a great deal of time must be expended, which in turn leads to production losses and financial expenditures. On the other hand, if the web tension is too low, there is a risk of congestion of the material web in the device, which also leads to a pusher. In order to avoid tampers or breaks or tears of the material web, the same amount of material per unit time of the device must be supplied on average as are dissipated by it.

Aus der DE 41 37 818 A1 ist eine Vorrichtung bekannt, bei der sich die Bahnspannung zwischen dem Einzug und dem Haltemittel regeln lässt. Bei dieser Vorrichtung ist der Einzug als ein Zugwalzenpaar ausgebildet, wobei die Regelung der Bahnspannung durch ein Verstellen der Drehzahl der Zugwalzen erreicht wird. In der genannten Schrift ist allerdings nicht offenbart, nach welchen Kriterien sich die Regelung richtet. Weder ist ein optimaler Wert für die Bahnspannung angegeben bzw. wodurch sich ein solcher auszeichnet, noch kann der Schrift entnommen werden, woran ein Abweichen der Bahnspannung vom optimalen oder gewünschten Wert erkannt wird.From the DE 41 37 818 A1 a device is known in which the web tension between the feeder and the holding means can be regulated. In this device, the feeder is designed as a pair of draw rollers, wherein the regulation of the web tension is achieved by adjusting the rotational speed of the draw rollers. In the cited document, however, it is not disclosed according to which criteria the regulation is directed. Neither is one Optimum value for the web tension indicated or which distinguishes such, nor can the font be removed, by which a deviation of the web tension is detected by the optimum or desired value.

Grundvoraussetzung für das Regeln der Bahnspannung auf einen Sollwert ist, dass der Istwert der Bahnspannung exakt und zeitaufgelöst gemessen werden kann. Das Erfassen des tatsächlichen Wertes der Bahnspannung ist aber technisch recht schwierig auszuführen. Bekannte Einrichtungen zum Erfassen der Bahnspannung wie beispielsweise Bahnspannungsmesswalzen oder Bahnspannungssensoren ermitteln den tatsächlichen Wert der Bahnspannung in der Regel indirekt über die Längendehnung der Materialbahn oder über Phasendifferenzen zwischen dem Einzug und dem Haltemittel. Beispielsweise wird in der EP 0 951 993 A1 ein solcher Weg zur Regelung der Bahnspannung beschritten. Eine indirekte Erfassung des tatsächlichen Werts der Bahnspannung ist aber mit relativ großen Ungenauigkeiten behaftet. Die unsichere Kenntnis der tatsächlichen Bahnspannung wirkt sich wiederum ungünstig auf die Regelung der Bahnspannung aus, da zum Erzielen einer exakten und verlässlichen Regelung die genaue Kenntnis des tatsächlichen Werts der Bahnspannung unabdingbar ist.The basic requirement for regulating the web tension to a target value is that the actual value of the web tension can be measured accurately and with time resolution. The detection of the actual value of the web tension is technically quite difficult to perform. Known devices for detecting the web tension such as web tension measuring rollers or web tension sensors determine the actual value of the web tension usually indirectly over the elongation of the web or phase differences between the feeder and the holding means. For example, in the EP 0 951 993 A1 followed such a path to control the web tension. Indirect detection of the actual value of the web tension, however, is associated with relatively large inaccuracies. The uncertain knowledge of the actual web tension in turn has an unfavorable effect on the regulation of the web tension, since the exact knowledge of the actual value of the web tension is indispensable for achieving an exact and reliable control.

Die DE 42 38 387 A1 offenbart ein Verfahren zur Schnittregisterregelung in einem Planoausleger einer Rotationsdruckmaschine mit einem Einzug, einer Scheideinrichtung und einer Förderwalze. Der Einzug und die Förderwalze sind jeweils durch unabhängige Regelkreise bezüglich einer Winkellage eines vorgeordneten Druckwerkes regelbar. Die Regelung erfolgt jeweils auf relativ zum Druckwerk einzuhaltende Winkellagen, wobei bei Abweichung der Ist- von der Sollwinkellage in einem inneren Regelkreis die Leistungszufuhr des jeweiligen Antriebes geregelt wird.The DE 42 38 387 A1 discloses a method for cutting register control in a plano boom of a rotary printing machine with a feeder, a separating device and a conveying roller. The feeder and the feed roller are each controlled by independent control circuits with respect to an angular position of an upstream printing unit. The control is carried out in each case to be maintained relative to the printing unit angular positions, wherein in case of deviation of the actual from the target angular position in an inner loop, the power supply of the respective drive is controlled.

Die DE 37 35 303 C2 zeigt einen Falzapparat mit einem Einzug, einer Scheideinrichtung und einen Punkturnadeln aufweisenden Falzmesserzylinder.The DE 37 35 303 C2 shows a folder with a feeder, a separating device and a point needles folding blade cylinder.

Die DD 33 320 offenbart einen Falzapparat mit einem Falzklappen aufweisenden Falzklappenzylinder.DD 33 320 discloses a folder with a jaw-folding jaw cylinder.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zum Regeln der Bahnspannung einer laufenden Bahn in einer bahnverarbeitenden Vorrichtung zu schaffen.The invention has for its object to provide a method and apparatus for controlling the web tension of a moving web in a web-processing apparatus.

Die Aufgabe wird durch erfindungsgemäß durch die Merkmale des Anspruchs 1 oder 14 gelöst.The object is achieved by the invention by the features of claim 1 or 14.

Mit der Erfindung lässt sich - ohne dass dafür der Istwert der Bahnspannung erfasst werden müsste - die Bahnspannung vor der Schneidstelle, insbesondere zwischen Einzug und Schneidstelle, während des Betriebs der Vorrichtung rasch und zuverlässig auf Null oder einen Wert nahe Null einstellen. Dadurch ist gewährleistet, dass die Materialbahn nach Ergreifen und vor dem Schneiden glattgezogen wird, ohne dass die Gefahr des Aus- oder Abreißens der Materialbahn besteht.With the invention can be - without the actual value of the web tension would have to be detected - the web tension before the cutting point, especially between feeder and cutting point, during operation of the device quickly and reliably set to zero or a value close to zero. This ensures that the web is pulled smooth after gripping and before cutting, without the risk of tearing or tearing of the web exists.

Anstelle des Betrages einer beliebigen für die Bahnspannung repräsentativen Größe wird gemäß der Erfindung eine periodische Variation einer solchen Größe zur Regelung der Bahnspannung herangezogen. Im Allgemeinen ist die Variation einer solchen Größe nicht repräsentativ für die Bahnspannung in dem Sinne, dass aus einer Messung dieser Variation eindeutig eine Bahnspannung berechnet werden könnte. Der Sonderfall einer verschwindenden (oder nahezu verschwindenden) Bahnspannung ist im vorliegenden Fall jedoch zuverlässig daran erkennbar, dass auch Variationen der Bahnspannung, die auf periodische Vorgänge in der Schneidvorrichtung wie etwa das Schneiden der Bahn selbst oder das Greifen des Bahnendes zurückgehen, zum Verschwinden neigen. Die Entscheidung, ob eine Messgröße variiert oder nicht ist in der Regel wesentlich einfacher und zuverlässiger zu treffen als die, ob eine Messgröße einen bestimmten vorgegebenen Wert hat.Instead of the amount of any size representative of the web tension, according to the invention a periodic variation of such a size is used to control the web tension. In general, the variation of such a quantity is not representative of the web tension in the sense that a web tension could be uniquely calculated from a measurement of this variation. However, the special case of vanishing (or almost vanishing) web tension in the present case is reliably recognizable by the fact that also variations in the web tension, which are due to periodic processes in the cutting device, such as the cutting of the web itself or the gripping of the tail, tend to disappear. The decision as to whether a measurand varies or not is generally much easier and more reliable to make than whether a measurand is a given given Has value.

Wenn die periodischen Variationen irgendeiner die Bahnspannung repräsentativen Größe eine Grenze überschreiten, kann daraus geschlossen werden, dass die Bahnspannung zu groß ist. Um die Bahnspannung zu erniedrigen, wird daher die vom Antrieb an den Einzug abgegebene mittlere Antriebsleistung erhöht, damit die Materialbahn vom Einzug schneller eingezogen wird. Wird die Materialbahn schneller eingezogen, so wird die Bahnspannung zwischen Einzug und Haltemittel verringert. Damit werden aber auch die periodischen Variationen der für die Bahnspannung repräsentativen Größe erniedrigt. Wenn die periodischen Variationen die Grenze wieder unterschreiten bzw. wenn sie verschwinden, ist die gewünschte Bahnspannung wieder erreicht und die Antriebsleistung kann wieder konstant gehalten werden.If the periodic variations of any quantity representative of the web tension exceed a limit, it can be concluded that the web tension is too great. In order to lower the web tension, therefore, the average drive power delivered by the drive to the feeder is increased, so that the web of material is retracted by the feeder faster. If the web retracted faster, the web tension between feeder and holding means is reduced. However, this also reduces the periodic variations of the variable representative of web tension. If the periodic variations fall below the limit again or if they disappear, the desired web tension is reached again and the drive power can be kept constant again.

Zuverlässigkeit und Empfindlichkeit sind besonders gut, wenn nur solche periodischen Schwankungen der Bahnspannung berücksichtigt werden, deren Periode mit der des Schneidens der Bahn übereinstimmt. Auf andere Ursachen bzw. Störungen zurückgehende Spannungsschwankungen bleiben so unberücksichtigt.Reliability and sensitivity are particularly good when only those periodic variations in web tension are taken into account whose period coincides with that of cutting the web. Voltage fluctuations due to other causes or disturbances are thus ignored.

Wenn die Schwankung der Bahnspannung und damit die Bahnspannung selbst exakt auf Null geregelt wird, ist es nicht möglich zu erkennen, ob die Bahn eventuell schneller in die Vorrichtung eingezogen als ausgegeben wird und Gefahr läuft, einen Stopfer hervorzurufen. Diese Gefahr ist ausgeschlossen, wenn für die Schwankung der Bahnspannung ein kleiner, aber von Null verschiebbarer Grenzwert angenommen wird.If the fluctuation of the web tension and thus the web tension itself is controlled exactly to zero, it is not possible to detect whether the web may be fed into the device faster than it is spent and runs the risk of causing a blockage. This risk is excluded if the fluctuation of the web tension is assumed to be a small but displaceable limit value.

Weil Variationen bei der Bahnspannung die mittlere vom Motor an ein Zugelement, insbesondere den Einzug abgegebene Leistung derart beeinflussen, dass auch diese Leistung entsprechend variiert, kann als die für die Bahnspannung repräsentative Größe eine solche Größe gewählt werden, die für die vom Motor abgegebene Leistung repräsentativ ist. Solche Größen lassen sich besonders einfach und ohne weitergehende zusätzliche Vorrichtungsmaßnahmen erfassen. Dabei handelt es sich bei der für die vom Motor abgegebene Leistung repräsentativen Größe ganz besonders bevorzugt um die Stromstärke des vom Motor aufgenommenen Betriebsstroms.Because variations in web tension affect the average power delivered by the motor to a tension member, particularly the neck, such that this power also varies accordingly, the size representative of the web tension can be chosen to be that representative of the power output by the engine is. Such sizes are particularly easy and without further record additional device measures. In this case, the quantity representative of the power output by the engine is very particularly preferably the current strength of the operating current absorbed by the motor.

Die Vorrichtung kann beispielsweise über eine Anzeige verfügen, auf welcher Regelungsmaßnahmen und/oder Wirkungen der Regelung angezeigt werden. Damit wird es auch Bedienpersonal der Vorrichtung ermöglicht, den Betrieb der Vorrichtung zu überwachen.The device may, for example, have a display on which control measures and / or effects of the control are displayed. This also allows operators of the device to monitor the operation of the device.

Aufgrund der einfachen Ausführung handelt es sich bei dem Einzug bevorzugterweise um ein Zugwalzenpaar.Due to the simple design, the feeder is preferably a pair of draw rollers.

Das Haltemittel ist bevorzugt an einem Transportzylinder eines Falzapparates, z. B. als Sammelzylinder ausgeführt, angeordnet. Bei dem Haltemittel kann es sich beispielsweise um einen Greifer oder eine Falzklappe oder eine Punkturleiste mit Punkturnadeln handeln. Sofern das Haltemittel an einem Sammelzylinder angeordnet ist, umfasst die Vorrichtung darüber hinaus besonders bevorzugt einen an der Schneidstelle mit dem Sammelzylinder zusammenwirkenden Schneidzylinder. Bei einer solchen Vorrichtung sind sowohl der Sammelzylinder als auch der Schneidzylinder drehbar gelagert. Die eingezogene Materialbahn wird zwischen Einzug und Schneidstelle von dem Haltemittel ergriffen, in Folge der Drehung des Sammelzylinders mitgenommen, wobei das Haltemittel die Schneidstelle passiert, und anschließend an der sich nun zwischen Einzug und Haltemittel befindlichen Schneidstelle vom mit dem Sammelzylinder zusammenwirkenden Schneidzylinder durchtrennt. Der dadurch erhaltene Materialabschnitt ist nach wie vor vom Haltemittel gehalten. Er wird vom sich drehenden Sammelzylinder weiter gefördert und an späterer Stelle von bekannten Einrichtungen entweder sofort vom Sammelzylinder abgeleitet oder erst nach einer vorgegebenen Anzahl von Umdrehungen des Sammelzylinders. Dabei wird mit jeder Umdrehung des Sammelzylinders ein neuer Materialabschnitt auf den am Sammelzylinder bereits aufliegenden Materialabschnitt aufgelegt, um einen Stapel mit einer vorgegebenen Anzahl von Materialabschnitten zu bilden, so dass schließlich dieser Stapel vom Sammelzylinder abgeleitet wird.The holding means is preferably on a transport cylinder of a folder, z. B. designed as a collection cylinder arranged. The holding means may be, for example, a gripper or a jaw or a spur strip with puncture needles. If the holding means is arranged on a collecting cylinder, the device moreover preferably comprises a cutting cylinder cooperating with the collecting cylinder at the cutting point. In such a device, both the collecting cylinder and the cutting cylinder are rotatably mounted. The drawn-in material web is taken between the intake and cutting point of the holding means, taken along rotation of the collecting cylinder, wherein the holding means passes through the cutting point, and then cut at the cutting point now located between the intake and holding means cooperating with the collecting cylinder cutting cylinder. The material section thus obtained is still held by the holding means. He is further promoted by the rotating cylinder collector and later derived from known facilities either immediately from the collecting cylinder or only after a predetermined number of revolutions of the collecting cylinder. In this case, with each revolution of the collecting cylinder, a new material section on the already on the collecting cylinder resting material portion placed to form a stack with a predetermined number of sections of material, so that finally this stack is derived from the collecting cylinder.

Ganz besonders bevorzugt ist die Vorrichtung ein Falzapparat einer Druckmaschine, insbesondere einer Rollenrotationsdruckmaschine.Most preferably, the device is a folder of a printing press, in particular a web-fed rotary printing press.

Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und wird im Folgenden näher beschrieben.Embodiments of the invention are illustrated in the drawings and will be described in more detail below.

Es zeigen:

Fig.1:
schematischer Aufbau eines Teils einer Druckmaschine mit einem Falzapparat;
Fig. 2
eine zweite, schematische Ausführung mit mehreren Falztrichtern und Zugelementen.
Show it:
Fig.1:
schematic construction of a part of a printing press with a folding apparatus;
Fig. 2
a second, schematic design with multiple formers and tension elements.

Zu der in der Figur 1 dargestellten Vorrichtung 01, insbesondere Falzapparat 01 gehören ein Transportzylinder 02, insbesondere als Sammelzylinder 02 ausgeführt, ein Schneidzylinder 03, ein Zugelement 04), z. B. ein Einzug 04, insbesondere ein Zugwalzenpaar 04, ein Motor 06, eine Steuereinheit 07 und eine Anzeige 18, z. B. ein Bildschirm 18. Am Sammelzylinder 02 sind Haltemittel 14, insbesondere Punkturleisten 14 mit Punkturnadeln angeordnet. Der Schneidzylinder 03 verfügt über Schneidmesser 17. Der Sammelzylinder 02 und der Schneidzylinder 03 sind aneinander angestellt und begrenzen einen Schneidspalt 16 bzw. Schneidstelle 16, in folgenden auch Spalt 16. Sowohl der Sammelzylinder 02 als auch der Schneidzylinder 03 sind drehbar gelagert. Sie drehen sich in den jeweils durch einen Pfeil angedeuteten Richtungen. Das Zugwalzenpaar 04 ist vom Motor 06 angetrieben, der wiederum durch die Steuereinheit 07 gesteuert ist. Mit der Steuereinheit 07 kann ein Bildschirm 18 verbunden sein, an den die Steuereinheit 07 Daten ausgeben kann. Dem Falzapparat 01 vorgelagert sind in der Druckmaschine eine Walze 09, z. B. eine Trichtereinlaufwalze 09 mit einer an diese angestellten Walze 11, z. B. eine Anpresswalze 11 oder Anpressrolle 11. Zwischen den Walzen 09; 11 und dem Falzapparat 01 ist ein Falztrichter 12 angeordnet.To the device 01 shown in Figure 1, in particular folding device 01 include a transport cylinder 02, in particular designed as a collecting cylinder 02, a cutting cylinder 03, a tension element 04), z. B. a feeder 04, in particular a pull roller pair 04, a motor 06, a control unit 07 and a display 18, for. B. a screen 18. On collecting cylinder 02 holding means 14, in particular Punkturleisten 14 are arranged with puncturing needles. The collecting cylinder 02 and the cutting cylinder 03 are set against each other and define a cutting gap 16 and cutting point 16, in the following also gap 16. Both the collecting cylinder 02 and the cutting cylinder 03 are rotatably mounted. They rotate in the direction indicated by an arrow. The Zugwalzenpaar 04 is driven by the engine 06, in turn, by the control unit 07 is controlled. With the control unit 07, a screen 18 may be connected, to which the control unit 07 can output data. Preceding the folder 01 are in the printing press a roller 09, z. B. a funnel inlet roller 09 with a hired to this roller 11, z. B. a pressure roller 11 or pressure roller 11. Between the rollers 09; 11 and the folder 01, a former 12 is arranged.

Eine zu verarbeitende laufende Bahn 08, z. B. Materialbahn 08, insbesondere Papierbahn 08, umschlingt die Trichtereinlaufwalze 09 und wird dabei von der Anpresswalze 11 gegen die Trichtereinlaufwalze 09 gedrückt gehalten. Sie durchläuft anschließend den Falztrichter 12. Im Falztrichter 12 wird die Papierbahn 08 längs gefalzt. Die längs gefalzte Papierbahn 08 läuft im Anschluss an den Falztrichter 12 in den Falzapparat 01 ein. Der Begriff "Papierbahn 08" bzw. "längs gefalzte Papierbahn 08" steht stellvertretend auch für einen Strang mehrerer aufeinander liegender Papierbahnen 08 bzw. längs gefalzter Papierbahnen 08.A processed web 08, z. B. web 08, in particular paper web 08, wraps around the hopper inlet roller 09 and is kept pressed by the pressure roller 11 against the hopper inlet roller 09. It then passes through the former 12. In the former 12, the paper web 08 is folded longitudinally. The longitudinally folded paper web 08 runs after the former 12 in the folder 01 a. The term "paper web 08" or "longitudinally folded paper web 08" is representative of a strand of several successive paper webs 08 or longitudinally folded paper webs 08.

In den Falzapparat 01 wird die Papierbahn 08 durch das vom Motor 06 angetriebene Zugwalzenpaar 04 eingezogen. Dabei wird vom Motor 06 eine Antriebsleistung an das Zugwalzenpaar 04 abgegeben, welches gemäß dieser Antriebsleistung auf die in das Zugwalzenpaar 04 einlaufende Papierbahn 08 eine Zugkraft und auf die aus dem Zugwalzenpaar 04 auslaufende Papierbahn 08 eine Schubkraft ausübt. Je höher die vom Motor 06 abgegebene Antriebsleistung, um so größer ist die vom Zugwalzenpaar 04 auf die einlaufende Papierbahn 08 ausgeübte Zugkraft sowie die auf die aus dem Zugwalzenpaar 04 auslaufende Papierbahn 08 ausgeübte Schubkraft. Die Größe der vom Motor 06 abgegebenen Antriebsleistung wird von der Steuereinheit 07 geregelt.In the folder 01, the paper web 08 is pulled through the driven by the motor 06 Zugwalzenpaar 04. In this case, a drive power is delivered from the motor 06 to the Zugwalzenpaar 04, which exerts a pulling force and on the expiring of the Zugwalzenpaar 04 paper web 08 a thrust according to this drive power to the incoming paper train 08 in the Zugwalzenpaar 04. The higher the drive power delivered by the motor 06, the greater is the tensile force exerted by the draw roller pair 04 on the incoming paper web 08 and the thrust force exerted on the paper web 08 leaving the draw roller pair 04. The size of the output from the engine 06 drive power is controlled by the control unit 07.

Die aus dem Zugwalzenpaar 04 auslaufende Papierbahn 08 wird - beispielsweise von in der Figur nicht dargestellten Bändern - gegen den Sammelzylinder 02 gedrückt und von aus dem Sammelzylinder 02 ausfahrenden Punkturnadeln einer der Punkturleisten 14 aufgespießt. Dabei wird die Papierbahn 08 zwischen der Punkturleiste 14 und dem Zugwalzenpaar 04 glatt gezogen. Das nun von den Punkturnadeln gehaltene freie Ende der Papierbahn 08 läuft dann in den vom Sammelzylinder 02 und dem an ihn angestellten Schneidzylinder 03 gebildeten Spalt 16 ein. Im Verlauf der weiteren Drehung des Sammelzylinders 02 durchläuft die Punkturleiste 14 den Spalt 16 und zieht die Papierbahn 08 mit sich durch den Spalt 16. Während sich die Punkturleiste 14 durch den Spalt 16 und über diesen hinaus bewegt, erreicht das am sich in Pfeilrichtung drehenden Schneidzylinder 03 angeordnete Schneidmesser 17 den Spalt 16 und schneidet im Zusammenwirken mit dem Sammelzylinder 02 einen Materialabschnitt 13, insbesondere Papierabschnitt 13 von der Papierbahn 08 ab. Entsprechend zu o. g. bzgl. eines Strangs von mehreren übereinander angeordneten Papierbahnen 08 ist unter Materialabschnitt 13 auch der Abschnitt eines mehrere Lagen aufweisenden Strangabschnittes zu verstehen. Somit stellt der Spalt 16 eine Schneidstelle des Falzapparates 01 dar. Noch bevor der Papierabschnitt 13 am Spalt 16 von der Papierbahn 08 abgeschnitten wird, hat schon die der den Papierabschnitt 13 haltenden Punkturleiste 14 auf dem Sammelzylinder 02 nachfolgend angeordnete Punkturleiste 14 die Papierbahn 08 noch vor Passieren des Spalts 16 erreicht und diese mit ihren Punkturnadeln durchstochen, so dass die Papierbahn 08 nicht nur vor und während sondern auch unmittelbar nach Erfolgen des Schnittes gehalten ist. Der abgeschnittene Papierabschnitt 13 wird schließlich auf bekannte Weise vom Sammelzylinder 02 abgeleitet. Da dies nicht Gegenstand der Erfindung ist, wird vorliegend auf eine Beschreibung des Ableitens des Papierabschnitt 13 vom Sammelzylinder 02 verzichtet.The expiring from the Zugwalzenpaar 04 paper web 08 is - for example, not shown in the figure bands - pressed against the collecting cylinder 02 and impaled by out of the collecting cylinder 02 Punkturnadeln one of the spur strips 14. In this case, the paper web 08 between the spur strip 14 and the Pull roller pair 04 smooth pulled. The now held by the point needles free end of the paper web 08 then runs into the gap 16 formed by the collecting cylinder 02 and the employed him cutting cylinder 03 a. In the course of the further rotation of the collecting cylinder 02, the sprocket 14 passes through the gap 16 and pulls the paper web 08 with it through the gap 16. While the spur strip 14 moves through the gap 16 and beyond, the cutting cylinder rotates in the direction of the arrow 03 arranged cutting blade 17, the gap 16 and intersects in cooperation with the collecting cylinder 02 a material section 13, in particular paper section 13 of the paper web 08 from. Corresponding to the above with respect to a strand of a plurality of superimposed paper webs 08, material section 13 is also to be understood as the section of a multi-layer strand section. Thus, the gap 16 is a cutting point of the folder 01. Even before the paper section 13 is cut at the gap 16 of the paper web 08, already has the paper section 13 holding sprocket 14 on the collecting cylinder 02 subsequently arranged spur 14 the paper web 08 before Passing the gap 16 reached and pierced with their puncture needles, so that the paper web 08 is held not only before and during but also immediately after the success of the cut. The cut paper section 13 is finally derived in a known manner from the collecting cylinder 02. Since this is not the subject of the invention, in the present case a description of the derivation of the paper section 13 from the collecting cylinder 02 is dispensed with.

Sofern die Punkturleisten 14 aufgrund der Drehung des Sammelzylinders 02 gegenüber dem Zugwalzenpaar 04 eine Voreilung aufweisen, baut sich innerhalb der auf einer der Punkturleisten 14 aufgespießten Papierbahn 08 eine Bahnspannung zwischen dem Zugwalzenpaar 04 und dieser Punkturleiste 14 auf, wodurch es zu einer Dehnung der Papierbahn 08 kommt. Wenn die Bahnspannung allzu groß ausfällt, kann dies zu Punkturausrissen an denjenigen Stellen der Papierbahn 08 führen, an denen sie von den Punkturnadeln durchstochen wird. Schlimmstenfalls reißt die Papierbahn 08 über der ganzen Breite ab und die vom Einzug 04 weiterhin eingezogene Papierbahn 08 staut sich zwischen Einzug 04 und Sammelzylinder 02 und verursacht einen Stopfer im Falzapparat 01. Um ein zu starkes Anwachsen der Bahnspannung zu vermeiden, wird die Bahnspannung in der Papierbahn 08 daher zwischen dem Zugwalzenpaar 04 und der die Papierbahn 08 haltenden Punkturleiste 14 geregelt, was im Folgenden erläutert wird.If the puncture strips 14 have due to the rotation of the collecting cylinder 02 with respect to the Zugwalzenpaar 04 an overrun, builds up within the punctured on one of the puncture strips 14 paper web 08 web tension between the Zugwalzenpaar 04 and this spur strip 14, causing it to an elongation of the paper web 08th comes. If the web tension is too great, this can lead to puncture tears at those parts of the paper web 08 where it is punctured by the puncturing needles. In the worst case, the paper web 08 rips over the Whole width from and the retraction 04 still retracted paper web 08 accumulates between feed 04 and collecting cylinder 02 and causes a stuffer in the folder 01. In order to avoid excessive growth of the web tension, the web tension in the paper web 08 is therefore between the Zugwalzenpaar 04 and regulated the paper web 08 holding spur 14, which will be explained below.

Dabei wird angenommen, dass beim Einsetzen der Bahnspannungsregelung die Papierbahn 08 zwischen dem Zugwalzenpaar 04 und der das führende Ende der Papierbahn 08 haltenden Punkturleiste 14 unter einer nichtverschwindenden Spannung steht. Wenn die nachfolgende Punkturleiste 14 die Papierbahn 08 durchstößt, trägt sie zunächst noch keine Zugspannung. Erst beim Abschneiden des Papierabschnitt 13 bricht die Spannung in der Papierbahn 08 für einen kurzen Moment ein, und baut sich an der nachfolgenden Punkturleiste 14 wieder auf. Bei dieser Phase des schnellen Spannungsaufbaus ist die Gefahr des Ausreißens besonders hoch. Der kurzzeitige Zusammenbruch der Bahnspannung führt dazu, dass die zum Einziehen der Papierbahn 08 in den Falzapparat 01 zu leistende Antriebsarbeit allein vom Motor 06 des Zugwalzenpaars 04 aufzubringen ist. Dessen Leistung und damit seine Stromaufnahme steigen für kurze Zeit heftig an. Dieser Vorgang wiederholt sich jedes Mal, wenn ein Papierabschnitt 13 von der gespannten Papierbahn 08 abgeschnitten wird.It is assumed that the web 08 between the Zugwalzenpaar 04 and the leading end of the paper web 08 holding sprocket 14 is under a non-vanishing voltage when inserting the web tension control. If the subsequent spur strip 14 pierces the paper web 08, it initially carries no tension. Only when cutting the paper section 13, the tension in the paper web 08 breaks for a short moment, and builds on the subsequent spur strip 14 again. In this phase of rapid stress build-up, the risk of breaking is particularly high. The short-term collapse of the web tension leads to the fact that the input to the paper web 08 in the folder 01 to be performed drive work is applied solely by the motor 06 of the Zugwalzenpaars 04. Its performance and thus its current consumption rise sharply for a short time. This process is repeated every time a paper section 13 is cut off from the tensioned paper web 08.

Der Betriebsstrom des Motors 06 wird von der Steuereinheit 07 auf das Auftreten von solchen periodischen Variationen hin überwacht. Sobald solche periodischen Variationen des Betriebsstromes auftreten und eine gewisse Grenze überschreiten, schließt die Steuereinheit 07 daraus, dass die Bahnspannung in der Papierbahn 08 zwischen dem Zugwalzenpaar 04 und der Punkturleiste 14 zu groß ist. Um die Bahnspannung zu reduzieren, regelt die Steuereinheit 07 die Drehzahl des Motors 06 derart, dass sich die von dem Zugwalzenpaar 04 auf die Papierbahn 08 in Einziehrichtung ausgeübte Antriebskraft abgegebene Antriebsleistung bzw. Drehzahl erhöht. Dadurch wird aber auch die Voreilung der Punkturleisten 14 gegenüber dem Zugwalzenpaar 04 erniedrigt, so dass die Papierbahn 08 zwischen den Punkturleisten 14 und dem Zugwalzenpaar 04 weniger stark gedehnt wird und die Bahnspannung der Papierbahn 08 deswegen geringer ausfällt. Mit verringerter Bahnspannung nimmt auch die Größe der periodischen Variationen ab. Sobald diese die Grenze unterschreiten, wird die Drehzahl und/oder Antriebsleistung des Motors 06 nicht weiter erhöht. Es kann vorgesehen werden, dass die Steuereinheit 07 laufend Daten über die periodischen Variationen und die vom Motor 06 abgegebene Drehzahl und/oder Antriebsleistung an den Bildschirm 18 ausgibt, auf dem diese zur Information von die Druckmaschine bedienendem Personal angezeigt werden.The operating current of the motor 06 is monitored by the control unit 07 for the occurrence of such periodic variations. Once such periodic variations of the operating current occur and exceed a certain limit, the control unit 07 concludes that the web tension in the paper web 08 between the Zugwalzenpaar 04 and the spur 14 is too large. In order to reduce the web tension, the control unit 07 controls the rotational speed of the motor 06 in such a way that the drive power or rotational speed output by the pulling roller pair 04 on the paper web 08 in the direction of pulling in increases. As a result, however, the overfeed of the puncture strips 14 with respect to the draw roller pair 04 is lowered, so that the paper web 08 is stretched less between the Punkturleisten 14 and the Zugwalzenpaar 04 and the web tension of the paper web 08 therefore less fails. With reduced web tension, the size of the periodic variations also decreases. Once these fall below the limit, the speed and / or drive power of the motor 06 is not further increased. It may be provided that the control unit 07 continuously outputs data on the periodic variations and the output from the engine 06 speed and / or drive power to the screen 18 on which these are displayed for information from the press operator.

In bevorzugter Ausführung wird dem Motor 06 bzw. dessen Antriebsregler (nicht dargestellt) durch eine Maschinensteuerung eine Solldrehzahl vorgegeben. Bei o. g. Verfahrensweise wird nun dieser Solldrehzahl aus der Maschinendrehzahl durch das Verfahren bzw. die Steuereinheit 07 ein Offset überlagert, so dass die periodischen Variationen in o. g. Weise verringert werden. Das Herauftasten an Richtung und Gesamtgröße dieses Offsets kann in einem iterativem Verfahren schrittweise vorgenommen werden.In a preferred embodiment, the motor 06 or its drive controller (not shown) by a machine control set a target speed. At o. G. Procedure, this target speed is now superimposed on the machine speed by the method or the control unit 07 an offset, so that the periodic variations in o. G. Be reduced. The stepping up of the direction and total size of this offset can be done step-by-step in an iterative procedure.

Besagte Grenze wird man im Allgemeinen zwar so klein wählen, dass ein Reißen der Papierbahn 08 sicher ausgeschlossen ist, aber dennoch größer als 0 wählen, um sicherzustellen, dass die Papierbahn 08 zwischen dem Zugwalzenpaar 04 und dem Sammelzylinder 02 straff bleibt.Although said limit will generally be chosen so small that rupture of the paper web 08 is safely excluded, but still greater than 0 choose to ensure that the paper web 08 between the Zugwalzenpaar 04 and the collecting cylinder 02 remains taut.

Wenn man als Grenze exakt Null wählt, kann der Fall auftreten, dass eine Voreilung des Zugwalzenpaars 04 gegenüber dem Sammelzylinder 02 kumuliert, mit der Folge, dass sich Papier zwischen dem Zugwalzenpaar 04 und dem Sammelzylinder 02 staut und zu einem Stopfer führt. Um dem vorzubeugen, kann vorgesehen werden, dass die Steuereinheit 07 immer, wenn eine verschwindende Zugspannung eine vorgegebene Zeitspanne lang aufrecht erhalten worden ist, die Leistung des Motors 06 geringfügig herabsetzt. (bzw. in unten genannter zweiten Ausführung die Solldrehzahl bzw. Leistung für den Antrieb des Transportzylinders 02 bzw. des Falzapparates 01 heraufsetzt.) Dies führt dazu, dass der Einzug langsamer läuft und eventuell eine vorhandene Voreilung sich verringert. Ist die Voreilung abgebaut, tritt wieder eine nichtverschwindende Zugspannung auf, und die Steuereinheit 07 beginnt erneut, diese Zugspannung auf Null zu regeln.If you select exactly zero as the limit, the case may occur that an overrun of the Zugwalzenpaars 04 cumulatively with respect to the collecting cylinder 02, with the result that paper between the Zugwalzenpaar 04 and the collecting cylinder 02 accumulates and leads to a pusher. To prevent this, it may be provided that the control unit 07, whenever a disappearing tension has been maintained for a predetermined period of time, slightly reduces the power of the motor 06. (Or in below mentioned second embodiment, the target speed or power for the drive of the transport cylinder 02 or of the folder 01 increases.) This leads to the fact that the feeder runs slower and possibly an existing overfeed is reduced. Once the overfeed has been removed, a non-zero tensile stress reoccurs, and the controller 07 again begins to control this tension to zero.

Die Verfahrensweise und Vorrichtung 01 wurde bislang anhand einer ersten Ausführung erläutert, wobei die Drehzahl bzw. Umfangsgeschwindigkeit des Zugwalzenpaares 04 bzw. dessen Motors 06 durch die Steuereinheit 07 verändert wurde.The procedure and device 01 has hitherto been explained with reference to a first embodiment, wherein the rotational speed or peripheral speed of the draw roller pair 04 or its motor 06 has been changed by the control unit 07.

Wesentlich ist jedoch, dass durch eine geeignete Steuereinrichtung 07 bzw. Verfahrensweise die Transportgeschwindigkeiten von Einzug 04 und Haltemittel 14 zueinander in einer Weise verändert werden, dass die erfasste periodische Variation der für die Bahnspannung repräsentativen Größe (hier bevorzugt Motorleistung) in o. g. Weise verringert wird.It is essential, however, that by a suitable control device 07 or procedure, the transport speeds of retraction 04 and holding means 14 to each other are changed in such a way that the detected periodic variation of the representative of the web tension size (preferably engine power here) in o. Way is reduced.

Diese kann in einer zweiten nicht dargestellten Ausführung auch dadurch erfolgen, dass die Transportgeschwindigkeit bzw. Drehzahl am Einzug 04 unverändert (bzw. entsprechend der Sollwertvorgabe) verbleibt, während zur Verringerung der periodischen Variation die Transportgeschwindigkeit des Haltemittels 14, d. h. die Umfangsgeschwindigkeit des Transportzylinders 02 in dem Sinne geändert wird, dass die Bahnspannung zwischen Einzug 04 und Haltemittel 14 sinkt - also z. B. verlangsamt wird. Dies geschieht beispielsweise über eine Absenkung der Solldrehzahl für den Antrieb des Transportzylinders 02 bzw. des Falzapparates 01.This can also be done in a second embodiment, not shown, that the transport speed or speed at retraction 04 unchanged (or according to the setpoint specification) remains, while reducing the periodic variation, the transport speed of the holding means 14, d. H. the peripheral speed of the transport cylinder 02 is changed in the sense that the web tension between feed 04 and holding means 14 decreases - ie z. B. is slowed down. This happens, for example, by lowering the setpoint speed for the drive of the transport cylinder 02 or the folder 01.

Die Verfahrensweise bzw. die Vorrichtung wurde im Vorstehenden, anhand einer vorteilhaften Ausgestaltung erläutert, wobei als dem Schneidspalt 16 vorgeordnetes und dem Falztrichter 12 nachgeordnetes Zugelement 04 der Einzug 04 des Falzapparates 01 herangezogen und berücksichtigt wurde.The procedure and the device has been explained above, with reference to an advantageous embodiment, as the cutting gap 16 upstream and the former 12 traction element 04 of the retraction 04 of the folder 01 was used and taken into account.

In einer alternativen Ausgestaltung der beiden o.g. Ausführungen wird anstelle des Einzuges 04 ein im Strangweg zwischen Falztrichter 12 und Falzapparat 01 angeordnetes Zugelement 04' (z. B. Zugwalze 04') herangezogen und entsprechend obiger Ausführungen berücksichtigt. Bei Vorhandensein mehrere Falztrichter 12 und/oder mehrerer Zugelemente 04' können auch mehrere Zugwalzen 04' in bzw. deren Motoren 06' herangezogen und entsprechend in der Steuerung 07 Berücksichtigung finden (Fig.2).In an alternative embodiment of the two o.g. Embodiments, a tension element 04 '(eg, tension roller 04') arranged in the strand path between the former 12 and the folder 01 is used instead of the intake 04 and taken into account in accordance with the above explanations. In the presence of a plurality of formers 12 and / or a plurality of tension elements 04 'can also be several draw rollers 04' used in or their motors 06 'and considered accordingly in the controller 07 (Figure 2).

In einer dritten Ausgestaltung kann sowohl der Einzug 04 als auch zusätzlich eine oder mehrere den Falztrichtern 12 nachgeordnete Zugelemente 04' herangezogen und entsprechend geregelt werden.In a third embodiment, both the feeder 04 and in addition one or more of the formers 12 downstream tension elements 04 'are used and regulated accordingly.

Die Verfahrensweise bzw. die Steuereinheit 07 kann eigenständig ausgeführt sein, oder aber Bestandteil einer die Bahn 08 an anderer Stelle, z. B. vor dem Trichter 12, insbesondere vor einen Einzugswerk liegenden, bzgl. ihrer Spannung regelnden Bahnspannungsregeleinrichtung sein.The procedure or the control unit 07 may be executed independently, or part of a train 08 elsewhere, z. B. in front of the hopper 12, in particular in front of a catchment work, respect. Its voltage regulating web tension control device.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

0101
Vorrichtung; FalzapparatContraption; folding
0202
Transportzylinder; SammelzylinderTransport cylinder; collecting cylinder
0303
Schneidzylindercutting cylinder
0404
Einzug; Zugelement; Zugwalzenpaarfeeder; tensile member; pair of drawing rollers
0505
--
0606
Motorengine
0707
Steuereinheitcontrol unit
0808
Bahn; Materialbahn; PapierbahnTrain; Web; paper web
0909
Walze; TrichtereinlaufwalzeRoller; Former inlet roller
1010
--
1111
Walze; Anpresswalze; AnpressrolleRoller; pressure roller; pressure roller
1212
Falztrichterformers
1313
Materialabschnitt; PapierabschnittMaterial portion; paper section
1414
Haltemittel; PunkturleisteHolding means; spur
1515
--
1616
Schneidspalt; Schneidstelle; SpaltCutting gap; Cutting location; gap
1717
Schneidmessercutting blade
1818
Anzeige; BildschirmDisplay; screen
04'04 '
Einzug; Zugelement; Zugwalzenpaarfeeder; tensile member; pair of drawing rollers
06'06 '
Motorengine

Claims (27)

  1. A method of regulating the tensioning of a running web (08) in a web-processing apparatus (01), wherein a drawing element (04; 04') co-operating with the web (08) for conveying the web (08) is arranged on the web path between a former (12) and a cutting point (16), and wherein the apparatus (01) comprises at least one holding means (14) and the cutting point (16), wherein the web (08) is conveyed by the drawing element (04; 04') at an adjustable first conveying speed and is held by the holding means (14) and is conveyed at a second conveying speed, and individual portions of material (13) are cut off from the web (08) at the cutting point (16) between the drawing element (04; 04) and the holding means (14), and wherein the tensioning of the web (08) between the drawing element (04; 04') and the holding means (14) is regulated by the method, in that
    - periodic variations of a magnitude representative of the web tensioning are detected, and
    - the conveying speeds of the drawing element (04; 04') and the holding means (14) are altered with respect to each other in such a way that the magnitude of the periodic variation detected decreases.
  2. A method according to Claim 1, characterized in that the change in the conveying speeds with respect to each other is carried out when the magnitude of the periodic variations detected exceed a specified threshold value in their amplitude.
  3. A method according to Claim 1, characterized in that the change in the conveying speeds with respect to each other is carried out by a change in a nominal rotational speed at the drawing element (04; 04') and/or in a conveying cylinder (02) comprising the holding means (14).
  4. A method according to Claims 2 and 3, characterized in that the nominal rotational speed of the drawing element (04; 04') is increased if the magnitudes of the periodic variations exceed a specified threshold value.
  5. A method according to Claims 2 and 3, characterized in that the nominal rotational speed of a conveying cylinder (02) comprising the holding means (14) is reduced if the magnitudes of the periodic variations exceed a specified threshold value.
  6. A method according to Claim 1, characterized in that in step (a) only those variations are detected and/or taken into consideration, of which the period corresponds to that of the severing of the portions of the material.
  7. A method according to Claim 2, characterized in that the threshold value is different from zero.
  8. A method according to any one of the preceding Claims, characterized in that the drawing element (04; 04') is driven by a motor (06), wherein the magnitude representative of the web tensioning is a magnitude representative of the power delivered by the motor (06).
  9. A method according to Claim 1, characterized in that a conveying cylinder (02) comprising the holding means (14) is driven directly or indirectly by a motor, wherein the magnitude representative of the web tensioning is a magnitude representative of the power delivered by the said motor.
  10. A method according to Claim 8 or 9, characterized in that the magnitude representative of the power delivered by the motor (06) is the current intensity of the operating current consumed by the motor (06).
  11. A method according to any one of the preceding Claims, characterized in that the regulating steps and/or the effects of the regulation are shown on a display (18).
  12. A method according to one or more of the preceding Claims, characterized in that a draw roller of an infeed means (04) of the apparatus (01) is taken into consideration as the drawing element.
  13. A method according to one or more of the preceding Claims, characterized in that a draw roller (04') arranged in the strand path between the former (12) and the entry into the apparatus (01) taken into consideration as the drawing element.
  14. An apparatus (01) for regulating the tensioning of a running web (08) in a web-processing apparatus (01), wherein a drawing element (04; 04') co-operating with the web (08) for conveying the web (08) is arranged on the web path between a former (12) and a cutting point (16), and wherein the apparatus (01) comprises at least one holding means (14) and the cutting point (16), wherein the drawing element (04; 04') conveys the web (08) at an adjustable first conveying speed and the holding means (14) holds the draw-in web (08) and conveys it at a second conveying speed, in order to cut individual portions of material (13) off from the web (08) at the cutting point (16) between the drawing element (04; 04') and the holding means (14), characterized in that the apparatus (01) comprises a control unit (07) which is set up in order to alter the conveying speeds of the drawing element (04; 04') and the holding means (14) in such a way that the magnitude of the periodic variation detected decreases.
  15. An apparatus (01) according to Claim 14, characterized in that the control unit (07) is set up to take into consideration only those periodic variations of which the period corresponds to that of the cutting of the web (08).
  16. An apparatus (01) according to Claim 14, characterized in that the infeed means (04) is driven by a motor (06), wherein the magnitude representative of the web tensioning is a magnitude representative of the power delivered by the motor (06).
  17. An apparatus (01) according to Claim 14, characterized in that a conveying cylinder (02) comprising the holding means (14) is driven directly or indirectly by a motor, wherein the magnitude representative of the web tensioning is a magnitude representative of the power delivered by the said motor.
  18. An apparatus (01) according to Claim 16 or 17, characterized in that the magnitude representative of the power delivered by the motor (06) is the current intensity of the operating current consumed by the motor (06).
  19. An apparatus (01) according to any one of Claims 14 to 18, characterized in that a display (18) is provided for displaying the regulating steps and/or the effects of the regulation.
  20. An apparatus (01) according to any one of Claims 14 to 19, characterized in that the drawing element (04) is formed by a pair of draw rollers (04).
  21. An apparatus (01) according to any one of Claims 14 to 20, characterized in that the holding means (14) is arranged on a collecting cylinder (02).
  22. An apparatus (01) according to Claim 21, characterized in that the holding means (14) is a gripper or a folding jaw or a pin strip (14).
  23. An apparatus (01) according to one of Claims 21 or 22, characterized in that a cutting cylinder (03) co-operating with the collecting cylinder (02) at the cutting point (16) is provided.
  24. An apparatus (01) according to any one of Claims 14 to 23, characterized in that the apparatus (01) is a folder (01) of a printing press.
  25. An apparatus (01) according to Claim 14, characterized in that the control unit (07) is a component part of a web-tensioning-regulating device which also regulates the web tensioning in at least one portion of its running path situated upstream of the folder (12).
  26. An apparatus (01) according to Claims 12 to 25, characterized in that the drawing element (04) is constructed in the form of an infeed means (04) of the apparatus (01).
  27. An apparatus (01) according to Claims 12 to 25, characterized in that the drawing element (04') is constructed in the form of a draw roller in the strand path between the former (12) and the entry into the apparatus (01).
EP06113905A 2005-05-27 2006-05-15 Method and device for controlling a tension in a running web in a web processing device Not-in-force EP1726548B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005024283A DE102005024283B4 (en) 2005-05-27 2005-05-27 Method and apparatus for controlling web tension of a traveling web in a web processing apparatus

Publications (2)

Publication Number Publication Date
EP1726548A1 EP1726548A1 (en) 2006-11-29
EP1726548B1 true EP1726548B1 (en) 2007-09-26

Family

ID=36968216

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06113905A Not-in-force EP1726548B1 (en) 2005-05-27 2006-05-15 Method and device for controlling a tension in a running web in a web processing device

Country Status (4)

Country Link
EP (1) EP1726548B1 (en)
AT (1) ATE374156T1 (en)
DE (2) DE102005024283B4 (en)
ES (1) ES2292158T3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE533264C2 (en) * 2008-12-12 2010-08-03 Lasermax Roll Systems Ab Quilting
JP5749089B2 (en) * 2011-06-10 2015-07-15 株式会社ミマキエンジニアリング Control method, control device, and processing device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD33320A1 (en) * 1962-04-09 1964-11-25 Ralf Olaf Kuehne Cylinder folder for web-fed rotary presses
US4381106A (en) * 1981-06-08 1983-04-26 Motter Printing Press Co. Collect cylinder for a rotary folder
DE3735303A1 (en) * 1987-10-17 1989-04-27 Roland Man Druckmasch FOLDING APPARATUS
DE4137818A1 (en) * 1991-11-16 1993-05-19 Roland Man Druckmasch Adjustment of strip tension in roller rotation printing machine - involves draw rollers fitted to fold funnel driven by speed-adjustable drive
DE4238387B4 (en) * 1992-11-13 2004-02-26 Heidelberger Druckmaschinen Ag Sheeter for material webs with a control device for the cutting register
DE19918399B4 (en) * 1998-04-22 2008-08-07 Maschinenfabrik Wifag Influencing the FAN-OUT in a Wet Offset Rotary Pressure
DE19903120A1 (en) * 1999-01-27 2000-08-03 Roland Man Druckmasch Deceleration mechanism for products passing through a mechanical folding apparatus

Also Published As

Publication number Publication date
ATE374156T1 (en) 2007-10-15
DE102005024283A1 (en) 2006-12-07
EP1726548A1 (en) 2006-11-29
DE102005024283B4 (en) 2008-05-15
DE502006000112D1 (en) 2007-11-08
ES2292158T3 (en) 2008-03-01

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