EP0545236A1 - Control apparatus for web unwinding device, particularly for rotary printing machines - Google Patents

Control apparatus for web unwinding device, particularly for rotary printing machines Download PDF

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Publication number
EP0545236A1
EP0545236A1 EP92120027A EP92120027A EP0545236A1 EP 0545236 A1 EP0545236 A1 EP 0545236A1 EP 92120027 A EP92120027 A EP 92120027A EP 92120027 A EP92120027 A EP 92120027A EP 0545236 A1 EP0545236 A1 EP 0545236A1
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EP
European Patent Office
Prior art keywords
characteristic curve
pendulum roller
control device
der
control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP92120027A
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German (de)
French (fr)
Inventor
Roland Merz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
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Filing date
Publication date
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0545236A1 publication Critical patent/EP0545236A1/en
Withdrawn legal-status Critical Current

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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
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/044—Sensing web tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/06—Registering, tensioning, smoothing or guiding webs longitudinally by retarding devices, e.g. acting on web-roll spindle
    • B65H23/063—Registering, tensioning, smoothing or guiding webs longitudinally by retarding devices, e.g. acting on web-roll spindle and controlling web tension

Definitions

  • Control arrangements are used in unwinding devices for webs, which implement a desired web tension in the web drawn off the winding roll.
  • a pendulum roller which is partially wrapped around by the web, functions as a sensor for the web tension.
  • a control loop regulates the braking torque of a brake acting on the circumference or center of the winding roller. Malfunctions are caused by the changing diameter of the winding roll, roll lay u. a. corrected.
  • Position control of the pendulum roller is known, which enables control loop structures (DD-PA WP B65H / 341508 8) 1) in which the center position of the pendulum roller is specified as a setpoint in order to have a large control reserve in the event of disturbance variables such as roll impact, emergency stop, roll change.
  • the first-mentioned type of interference sizes can lead to an oscillation and thus to an instability of the control loop.
  • the object of the invention is to provide a control arrangement for unwinding devices of webs, in particular on rotary printing presses, with a pendulum roller for a middle position control and with a measuring device which detects the position of the pendulum roller on the output side and is connected to a control device which acts on a brake of the winding roller, for all Interference levels occurring in the operating state ensure great stability of the control loop.
  • a characteristic curve correction element is arranged between the sensor and the control device, the characteristic curve of which is flat in the region of the central position of the pendulum roller and progressively steeper towards its end positions.
  • the linear characteristic curve representing the functional relationship existing between the pendulum roller deflection and the signal emitted by the sensor is corrected as a function of the disturbance quantities occurring in the operating state so that all disturbance quantities are regulated only to the extent necessary for the required maintenance of the web tension, so that the Stability of the control loop is always guaranteed.
  • the brake 9 engages the spindle 10 of the winding roll.
  • the invention can be used in the same way if the braking force acts on the circumference of the winding roll 1, for example via a belt.
  • the output signal of the control device can also be supplied, for example, to an electrical drive of the winding roll operating in a four-quadrant drive.
  • the characteristic curve correction element 5 can be implemented as an electronic circuit.

Abstract

Control arrangement having a pendulum roll (3) controlled to a central position and a measured-value transmitter (4) which registers the position of the pendulum roll (3) and is connected at its output side to a control device (8) influencing the tension of the web (2) drawn off from the wound reel (1). In order to ensure a high stability of the control loop for all disturbance parameters occurring in the operating state, there is arranged between the measured-value transmitter (4) and the control device (8), a characteristic-curve correction element (5), the characteristic curve (7) of which has a shallow gradient in the range ( DELTA phi ) of the centre layer (Pm) of the pendulum roll (3) and in each case an increasingly steeper gradient towards the end positions (Po,Pu). <IMAGE>

Description

In Abwickeleinrichtungen fuer Bahnen kommen Regelanordnungen zur Anwendung , die eine gewuenschte Bahnspannung in der von der Wickelrolle abgezogenen Bahn realisieren. Hierzu fungiert eine von der Bahn teilweise umschlungene Pendelwalze als Messwertgeber fuer die Bahnspannung. In Abhaengigkeit von der Bewegung der Pendelwalze regelt ein Regelkreis das Bremsmoment einer an Umfang oder Zentrum der Wickelrolle angreifenden Bremse. Dabei werden Stoerungen durch den sich aendernden Durchmesser der Wickelrolle, Rollenschlag u. a. ausgeregelt.Control arrangements are used in unwinding devices for webs, which implement a desired web tension in the web drawn off the winding roll. For this purpose, a pendulum roller, which is partially wrapped around by the web, functions as a sensor for the web tension. Depending on the movement of the pendulum roller, a control loop regulates the braking torque of a brake acting on the circumference or center of the winding roller. Malfunctions are caused by the changing diameter of the winding roll, roll lay u. a. corrected.

Bekannt sind eine Lageregelung der Pendelwalze ermoeglichende Regelkreisstrukturen (DD-PA WP B65H / 341508 8)1), bei denen die Mittelstellung der Pendelwalze als Sollwert vorgegeben wird, um bei auftretenden Stoergroessen, wie Rollenschlag, Notstop, Rollenwechsel eine grosse Regelreserve zu besitzen. Dabei sind die mit einer geringen Pendelwalzenauslenkung aus der Sollage verbundenen, eine geringe Bremskraftaenderung erfordenden Stoergroessen (z.B. Rollenschlag) von den mit einer grossen Pendelwalzenauslenkung verbundenen, eine grosse Bremskraftaenderung erfordenden Stoergroessen (z.B. Notstop) zu unterscheiden.
Die zuerst genannte Art von Stoergroessen kann zu einem Aufschwingen und damit zu einer Instabilitaet des Regelkreises fuehren.Position control of the pendulum roller is known, which enables control loop structures (DD-PA WP B65H / 341508 8) 1) in which the center position of the pendulum roller is specified as a setpoint in order to have a large control reserve in the event of disturbance variables such as roll impact, emergency stop, roll change. A distinction must be made between the disturbance quantities associated with a small pendulum roller deflection from the target position and requiring a small change in braking force (e.g. roller stroke) from the disturbance quantities associated with a large pendulum roller deflection requiring a large change in braking force (e.g. emergency stop).
The first-mentioned type of interference sizes can lead to an oscillation and thus to an instability of the control loop.

Aufgabe der Erfindung ist es, eine Regelanordnung fuer Abwickeleinrichtungen von Bahnen, insbesondere an Rotationsdruckmaschinen, mit einer Pendelwalze fuer eine Mittellagenregelung und einem die Lage der Pendelwalze erfassenden, ausgangsseitig mit einer eine Bremse der Wickelrolle beaufschlagenden Regeleinrichtung in Verbindung stehenden Messwertgeber zu schaffen, die fuer alle im Betriebszustand vorkommenden Stoergroessen eine grosse Stabilitaet des Regelkreises gewaehrleistet.
Das wird erreicht, indem erfindungsgemaess zwischen dem Messwertgeber und der Regeleinrichtung ein Kennlinienkorrekturglied angeordnet ist, dessen Kennlinie im Bereich der Mittellage der Pendelwalze flach und zu deren Endlagen hin jeweils zunehmend steiler verlaeuft. Dadurch wird die den zwischen der Pendelwalzenauslenkung und dem abgegebenen Signal des Messwertgebers bestehenden funktionellen Zusammenhang wiedergebende lineare Kennlinie in Abhaengigkeit von den im Betriebszustand auftretenden Stoergroessen so korregiert, dass alle Stoergroessen nur in dem fuer die geforderte Aufrechterhaltung der Bahnspannung erforderlichen Umfang geregelt werden, so dass die Stabilitaet des Regelkreises immer gewaehrleistet ist.The object of the invention is to provide a control arrangement for unwinding devices of webs, in particular on rotary printing presses, with a pendulum roller for a middle position control and with a measuring device which detects the position of the pendulum roller on the output side and is connected to a control device which acts on a brake of the winding roller, for all Interference levels occurring in the operating state ensure great stability of the control loop.
This is achieved in that, according to the invention, a characteristic curve correction element is arranged between the sensor and the control device, the characteristic curve of which is flat in the region of the central position of the pendulum roller and progressively steeper towards its end positions. As a result, the linear characteristic curve representing the functional relationship existing between the pendulum roller deflection and the signal emitted by the sensor is corrected as a function of the disturbance quantities occurring in the operating state so that all disturbance quantities are regulated only to the extent necessary for the required maintenance of the web tension, so that the Stability of the control loop is always guaranteed.

Dies ist im besonderen Masse dann der Falle, wenn die Kennlinie des Kennlinienkorrekturgliedes im Bereich der Mittellage der Pendelwalze flach und zu deren Endlagen hin jeweils zunehmend steiler verlaeuft.This is particularly the case when the characteristic curve of the characteristic correction element is flat in the region of the central position of the pendulum roller and progressively steeper towards its end positions.

Die Erfindung soll nachfolgend an einem Ausfuehrungsbeispiel naeher erlaeutert werden. Die zugehoerige Zeichnung zeigt:

Fig. 1:
eine Abwickeleinrichtung mit der erfindungsgemaessen Regelanordnung im Blockschaltbild
Fig. 2:
eine erfindungsgemaess durch das Kennlinienkorrekturglied gemaess Fig. 1 korregierte Kennlinie
Die schematisch dargestellte Abwickeleinrichtung in Fig. 1 enthaelt eine Wickelrolle 1, von der die Bahn 2 abgezogen wird. Letztere umschlingt teilweise eine Pendelwalze 3, die mit einem letzteren Lage erfassenden Messwertgeber 4 gekoppelt ist, dessen Ausgangssignale Xm einem Kennlinienkorrekturglied 5 zugeleitet werden, das gemaess der Darstellung in Fig. 2 die Kennlinie 6 des Messwertgebers 4 in die Kennlinie 7 ueberfuehrt. Die Kennlinie 7 verlaeuft im Bereich Δφ der Mittellage Pm der Pendelwalze 3 flach und sowohl zu der unteren als auch oberen Endlage Pu bzw. Po der Pendelwalze 3 hin zunehmend steiler. Dadurch wird erreicht, dass der beispielwiese durch einen Rollenschlag entstehende Ausschlag φ der Pendelwalze 3 im Bereich Δφ deren Mittellage Pm anstatt zu einem eine Regeleinrichtung 8 beaufschlagenden Ausgangssignal ΔXm nach der Kennlinie 6 zu einem wesentlich kleineren Ausgangssignal ΔXk am Kennlinienkorrekturglied 5 gemaess der Kennlinie 7 fuehrt. Damit wird ein Aufschwingen des Regelkreises infolge der periodisch auftretenden Rollenschlaege wirksam vermieden. Andererseits sind die beispielweise mit Notstop und dem Wickelrollenwechsel verbundenen groesseren Anschlaege φ der Pendelwalze im Bereich ihrer Endlagen Pu und PO mit einer Verstaerkung des Ausgangssignales Xk am Kennlinienkorrekturglied 5 auf Grund der groesseren Steilheit von der Kennlinie 7 gegenueber der Kennlinie 6 in diesem Bereich verbunden. Das von der Regeleinrichtung 8 an die die Wickelrolle 1 beaufschlagende Bremse 9 abgegebende Signal faellt dementsprechend ueberproportional Bremskraft veraendernd aus.The invention will be explained in more detail using an exemplary embodiment. The accompanying drawing shows:
Fig. 1:
an unwinder with the inventive control arrangement in the block diagram
Fig. 2:
a characteristic curve corrected according to the invention by the characteristic curve correction element according to FIG. 1
The unwinding device shown schematically in FIG. 1 contains a winding roll 1, from which the web 2 is drawn off. The latter partially wraps around a pendulum roller 3, which is coupled to a sensor 4 which detects the latter position, the output signals Xm of which are fed to a characteristic curve correction element 5 which, according to the illustration in FIG. 2, converts the characteristic 6 of the sensor 4 into the characteristic 7. The characteristic curve 7 runs flat in the area Δφ of the central position Pm of the pendulum roller 3 and increasingly steeper towards the lower and upper end positions Pu and Po of the pendulum roller 3. It is thereby achieved that the deflection φ of the pendulum roller 3 which arises, for example, as a result of a roll impact, in the region Δφ of its central position Pm instead of an output signal ΔXm acting on a control device 8 according to the characteristic curve 6, resulting in a significantly smaller output signal ΔXk on the characteristic curve correction element 5 according to the characteristic curve 7. This effectively prevents the control circuit from oscillating as a result of the periodically occurring roll hits. On the other hand, the larger stops φ of the pendulum roller in the area of their end positions Pu and PO, which are connected, for example, with an emergency stop and the changing of the winding rolls, are associated with an increase in the output signal Xk on the characteristic curve correction element 5 due to the greater steepness of the characteristic curve 7 compared to the characteristic curve 6 in this area. The signal emitted by the control device 8 to the brake 9 acting on the winding reel 1 accordingly fails to change the braking force disproportionately.

Im Ausfuehrungsbeispiel greift die Bremse 9 an der Spindel 10 der Wickelrolle an. Die Erfindung ist in gleicher Weise anwendbar, wenn die Bremskraft am Umfang der Wickelrolle 1, beispielsweise ueber einen Gurt wirkt.In the exemplary embodiment, the brake 9 engages the spindle 10 of the winding roll. The invention can be used in the same way if the braking force acts on the circumference of the winding roll 1, for example via a belt.

Ebenfalls kann das Ausgangssignal der Regeleinrichtung beispielsweise einem im Vierquadrantenantrieb arbeitenden elektrischen Antrieb der Wickelrolle zugeleitet werden.The output signal of the control device can also be supplied, for example, to an electrical drive of the winding roll operating in a four-quadrant drive.

Das Kennlinienkorrekturglied 5 kann als elektronische Schaltung realisiert werden.The characteristic curve correction element 5 can be implemented as an electronic circuit.

Denkbar ist jedoch auch eine Ausfuehrung, bei der das Ausgangssignal Xm des Messwertgebers 4 einem digitalen Rechner zugefuehrt wird, der die Kennlinienkorrektur mit Hilfe einer dafuer konzipierten Software realisiert.
Dies ist sinnvoll, wenn der gesamte Regelkreis in einem digitalen Rechner intigriert ist.However, an embodiment is also conceivable in which the output signal Xm of the sensor 4 is fed to a digital computer which realizes the characteristic curve correction with the aid of software designed for this purpose.
This makes sense if the entire control loop is integrated in a digital computer.

Claims (1)

Regelanordnung fuer Abwickeleinrichtungen fuer Bahnen, insbesondere an Rotationsdruckmaschinen, mit einer auf Mittellage geregelten Pendelwalze und einem die Lage der Pendelwalze erfassenden, ausgangsseitig mit einer die Spannung der von der Wickelrolle abgezogenen Bahn beeinflussenden Regeleinrichtung in Verbindung stehenden Messwertgeber, gekennzeichnet dadurch, dass zwischen dem Messwertgeber (4) und der Regeleinrichtung (8) ein Kennlinienkorrekturglied (5) angeordnet ist, dessen Kennlinie (7) im Bereich (Δφ) der Mittellage (Pm) der Pendelwalze (3) flach und zu deren Endlagen (Po; Pu) hin jeweils zunehmend steiler verlaeuft.Control arrangement for unwinding devices for webs, in particular on rotary printing presses, with a pendulum roller controlled in the middle position and a measuring device which detects the position of the pendulum roller and on the output side is connected to a measuring device which influences the tension of the web pulled off the winding roll, characterized in that between the measuring sensor ( 4) and the control device (8) a characteristic curve correction element (5) is arranged, the characteristic curve (7) in the area (Δφ) of the central position (Pm) of the pendulum roller (3) flat and increasingly steeper towards its end positions (Po; Pu) passed.
EP92120027A 1991-11-28 1992-11-25 Control apparatus for web unwinding device, particularly for rotary printing machines Withdrawn EP0545236A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4139101 1991-11-28
DE19914139101 DE4139101A1 (en) 1991-11-28 1991-11-28 CONTROL ARRANGEMENTS FOR UNWINDING DEVICES FOR RAILWAYS, ESPECIALLY ON ROTARY PRINTING MACHINES

Publications (1)

Publication Number Publication Date
EP0545236A1 true EP0545236A1 (en) 1993-06-09

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EP92120027A Withdrawn EP0545236A1 (en) 1991-11-28 1992-11-25 Control apparatus for web unwinding device, particularly for rotary printing machines

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110316595A (en) * 2018-03-30 2019-10-11 江苏九天光电科技有限公司 A kind of steel band winding double sheet force control device and method

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19501982B4 (en) * 1995-01-24 2009-06-10 Elau Gmbh Feeding device of a discontinuous web-shaped material processing machine
DE29720235U1 (en) * 1997-11-14 1998-01-22 Oce Printing Systems Gmbh Device for transporting and temporarily storing a web-shaped record carrier in an electrographic printing or copying device
DE19923204B4 (en) * 1999-05-20 2004-04-29 Man Roland Druckmaschinen Ag Speed control arrangement for an unwinder
DE19927118C2 (en) * 1999-06-15 2003-12-24 Bernhard Engel Device for controlling the speed of rotation of a motor-driven winding body and method
US20120292422A1 (en) 2011-04-18 2012-11-22 Alkar-Rapidpak-Mp Equipment, Inc. Systems and methods for supplying a web of packaging material to an indexing-motion packaging machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2528619A1 (en) * 1974-07-01 1976-01-22 Harris Corp DEVICE AND METHOD FOR CONTROLLING THE TENSION OF THE PRINTING SUBSTANCE WEB SUPPLIED TO A PRINTING UNIT
US4151594A (en) * 1976-02-26 1979-04-24 Bobst-Champlain, Inc. Web tension control for high-speed web handling equipment

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD295135A5 (en) * 1990-06-11 1991-10-24 Polygraph Druckmaschinenwerk,De RULES FOR TRANSPORT DEVICES FOR RAILWAYS

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2528619A1 (en) * 1974-07-01 1976-01-22 Harris Corp DEVICE AND METHOD FOR CONTROLLING THE TENSION OF THE PRINTING SUBSTANCE WEB SUPPLIED TO A PRINTING UNIT
US4151594A (en) * 1976-02-26 1979-04-24 Bobst-Champlain, Inc. Web tension control for high-speed web handling equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110316595A (en) * 2018-03-30 2019-10-11 江苏九天光电科技有限公司 A kind of steel band winding double sheet force control device and method

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Publication number Publication date
DE4139101A1 (en) 1993-06-03

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