EP0479992B1 - Warenbahnführer mit proportionalsteuerung des walzendrucks - Google Patents

Warenbahnführer mit proportionalsteuerung des walzendrucks Download PDF

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Publication number
EP0479992B1
EP0479992B1 EP91907813A EP91907813A EP0479992B1 EP 0479992 B1 EP0479992 B1 EP 0479992B1 EP 91907813 A EP91907813 A EP 91907813A EP 91907813 A EP91907813 A EP 91907813A EP 0479992 B1 EP0479992 B1 EP 0479992B1
Authority
EP
European Patent Office
Prior art keywords
material web
roll
force
web
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.)
Expired - Lifetime
Application number
EP91907813A
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German (de)
English (en)
French (fr)
Other versions
EP0479992A1 (de
Inventor
Herbert Oberstaller
Wolfgang Krauth
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.)
Erhardt and Leimer GmbH
Original Assignee
Erhardt and Leimer GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Erhardt and Leimer GmbH filed Critical Erhardt and Leimer GmbH
Publication of EP0479992A1 publication Critical patent/EP0479992A1/de
Application granted granted Critical
Publication of EP0479992B1 publication Critical patent/EP0479992B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
    • B65H23/032—Controlling transverse register of web
    • B65H23/038—Controlling transverse register of web by rollers

Definitions

  • the invention relates to a device of the type specified in the preamble of claim 1 and a method according to the preamble of claim 13.
  • the guiding effect is based on the clamping force between the control roller and the counter-roller, which, because of the inclined position, generates a web offset correction force acting transversely to the web running direction.
  • Signals generated when the edge positions are scanned control the force transmitter for the control roller. If the scanned edge moves outwards, the clamping force is reduced until it is completely eliminated and the control roller lifts off. On the other hand, if the edge strives inwards, the control roller is pressed against the counter roller with full clamping force.
  • the opposite web guide works accordingly.
  • the web tends to jump or flutter because the clamping force is often lost.
  • an undesirable pressure marking is created in the edge area.
  • the clamping force is inserted and released, the web is pulled apart and then left to its own devices and becomes narrower, which makes edge scanning difficult. It is not possible to keep the web at a constant width. Rather, when the web guide is opened, the web runs out sideways, so that it has to be stopped and first threaded again for a new start.
  • the invention has for its object to provide a device and a method of the type mentioned with which a gentle, jump and flutter-free guiding and holding a running web is made possible, and with which one standing web can be kept wide.
  • the device is also expediently designed such that in a limit case of the web offset when the roll engagement length limit is undershot for a web guide, the clamping force on the opposite web guide is completely eliminated in order to make it easier for a web guide to correct the web offset.
  • the undesirable pressure markings are nevertheless omitted, because when the clamping force is reinstated, it is gradually increased and there is no sudden pressing of the rollers. If the length limit is reached, at which the rollers of this web guide are only partially engaged with the web, then under certain circumstances even the full clamping force may no longer be sufficient to overcome the counter-pull of the other web guide, which acts with minimal clamping force. As soon as the clamping force on the opposite and fully engaged web guide is released, the slight intervention of one web guide with full clamping force is usually sufficient to correct the web offset.
  • the force transducer it is easily possible for the force transducer to be adjustable between a minimum and a maximum force value, or in several predetermined steps, until a roller guide length limit value is reached for a web guide. With continuous adjustment, the cross elasticity of the web is optimally used. If, on the other hand, adjustments are made in several predetermined stages, this means a simplification of the control technology with a reliable web offset correction.
  • the embodiment according to claim 8 is expedient because a broadband proportional sensor has a large active proportional range and generates clear signals that can be converted into unique control signals for the force transmitters.
  • a closed control loop is achieved via the web.
  • Proportional magnets are inexpensively available with exactly known and constant characteristics. They are reliable and can be precisely adjusted. Such proportional magnets are characterized in that the magnetic force generated is directly proportional to the current applied, so that the proportional magnet fulfills the function of a spring adjustable in its spring hardness without changing the characteristic curve. Proportional magnets can be easily Control via a current regulator.
  • the window comparator monitors the position of the web for the proportional control of the two proportional magnets.
  • the first timing element is used to switch off the current regulator of the proportional magnet, in whose web guide there is still full engagement when the roller engagement length limit value is reached in the other web guide.
  • the timer is activated as soon as the window comparator detects this critical web offset. If the web offset remains for the period of time set on the first timing element, the current controller is switched off in order to enable the web guide to make the correction with the lesser roller intervention.
  • the embodiment according to claim 12 is advantageous because the components provided here help to avoid damage to the web or the device. If, despite the currentless current regulator, the web guide who works with little intervention is not able to correct the web offset, for which the first timer provides him with time, then the second timer actuates a warning signal after the set time has elapsed, which indicates an error to the machine operator or even a switch that stops the web.
  • the force transmitter used is a pneumatic diaphragm cylinder with an actuating force for the control roller proportional to the compressed air supply or a prestressed spring element which is adjustable in the prestress.
  • Pneumatic diaphragm cylinders which are particularly useful in potentially explosive atmospheres or on wet material webs, can be adjusted very sensitively by modulating the application pressure or using an inflow or outflow regulator. Although a change in the characteristic curve can hardly be avoided with a spring element when the pretension is changed, it is nevertheless a continuous adjustment of the clamping force is achieved in a simple manner, for example by means of a spindle or lever drive which adjusts the spring preload.
  • the method variant according to claim 15 is also advantageous because the two proportional magnets generate their magnetic forces in strict dependence on the position of the web in the scanning area.
  • the current supply that is preferably specified is intended for a customary size of a web guide. With a considerable change in the size and the actuation mechanism, the range of suitable current application changes.
  • the method variant according to claim 16 is particularly advantageous because the guiding and spreading of the web is carried out with a high degree of security against damage. No edge area is completely released within a normal web offset area. The clamping force on the other web guide is released after a predetermined first period of time only after falling below the roller engagement in one web guide in order to increase the corrective effect. If the web offset is still not corrected, a warning signal is generated after a further second period of time or the web is stopped to avoid serious damage.
  • a device V for guiding and spreading a web B running in the direction of an arrow 8 consists of two web guides W1 and W2, which act on the edge areas K1 and K2.
  • the two web guides W1, W2 are at an angle ⁇ obliquely against the right angle to the web direction 8.
  • For each web guide W1, W2 includes a control device S1, S2, which are conveniently combined in a common control device R, which also contains an amplifier A.
  • a window comparator F is provided in the control unit R, which is connected to the current regulator SR 1, SR 2.
  • Each current controller SR1, SR2 can be switched off via a first, preferably adjustable, timer Z1, which can be activated by the window comparator F.
  • a warning signal generator G With a second timer Z2, which is connected to the window comparator F like the first timer Z1, a warning signal generator G can be actuated, or a main switch (not shown) for the web run can be activated.
  • Each web guide W1, W2 has ( Figures 2 and 3) a lower control roller 1 and an approximately parallel upper counter-roller 2.
  • the rollers 1, 2 include the respective edge area K1, K2 of the web B between them.
  • a scanning device 4 is arranged in the web running direction 8 behind the rollers 1, 2.
  • the control roller 1 is movably mounted on a power transmitter 3 relative to the counter roller 2. Both rollers 1, 2 are either freely rotatable or can be driven to rotate by means of an auxiliary drive (not shown) at the speed of the web B.
  • Each force generator 3 of a control roller 1 is continuously adjustable in such a way that the clamping force between the two rollers 1, 2 can be continuously changed without releasing the web.
  • a proportional magnet 14 is connected via a line 5 to the control device S1 or S2, as well as the scanning devices 4 via lines 6.
  • a line 7 links the two control devices S1, S2. In the direction of travel behind the web guides W1, W2, the web B is guided over a deflection roller 9.
  • both web guides W 1, W 2 apply a clamping force to their edge regions K 1 K 2.
  • the web B is spread out. If the material web B runs to the right in the running direction 8 in FIG. 1, for example, the scanning device 4 generates a signal corresponding to the edge position.
  • the force generator 3 is adjusted to a lower force value, so that, thanks to the clamping force in the web guide W2, the web B is pulled to the other side and the web run is thus corrected again. With a course in the opposite direction, these processes take place in reverse.
  • the clamping forces in both edge areas K1 K2 can be changed synchronously in opposite directions.
  • a proportional magnet 14 is provided according to FIGS. 1, 2 and 3, the magnetic force of which changes continuously in proportion to the current intensity controlled by the current regulator SR 1 or SR 2.
  • a pneumatic diaphragm cylinder could also be provided, the actuating force of which can be changed directly for the control roller 1 in proportion to the pressurization.
  • a spring element e.g. to use a coil spring, the preload of which is changed continuously and gradually or continuously. Electric motors or similar proportionally adjustable power transmitters could also be used.
  • the two rollers 1, 2 are mounted approximately parallel to one another in a holder 13.
  • the control roller 1, which must be adjustable, is seated on a support part 12 on which the force generator 3 acts.
  • the scanning device 4 is a broadband proportional sensor with a lower part 10 and an upper part 16, which are also fastened to the holder 13.
  • a safety device 11 is attached in the web running direction in front of the rollers 1, 2 .
  • the bracket 13 can be fixed by means of a support 15 in the desired inclined position (angle ⁇ ) relative to the track on a frame, not shown.
  • the control device can be attached directly to one of the two web guide or integrated and connected to the other web guide via appropriate cable connections.
  • the window comparator F is used for proportional control of the proportional magnets 14 of the two web guides W1 and W2 via the current regulator SR1, SR2. If a normal web offset occurs, in which the rollers 1, 2 of the web guide are at least up to 60 or 70% of their length L in engagement with the edge area, the clamping force is never completely eliminated at a web guide, but the clamping forces are correspondingly changed proportionally to the web position. However, if there is a web offset in which a roller engagement length limit Q ( Figure 3) is reached, ie that the rollers 1, 2 of this web guide W1, W2 are only 60 or 70% engaged, there is a risk that this web guide W1, W2 with reduced roller engagement even with maximum magnetic current (approx.
  • the window comparator F determines this critical offset by means of the signals from the scanning devices 4. He activates the first timer Z1. Within the time period set by the first timer Z 1, it is awaited whether a correction of the web offset occurs. If this is the case, the timer Z 1 is switched off again. On the other hand, if this is not the case, then the timing element Z 1 switches off the current regulator SR 1 or SR 2 of the proportional magnet 14 after the time period has elapsed, with the rollers 1, 2 being fully engaged.
  • the clamping force is completely removed there, if necessary, the control roller 1 is lifted off completely.
  • the second timer Z2 is then activated.
  • the window comparator F monitors over the period of the second timer Z2 whether the web B is corrected properly and then turns off the second timer Z2 in the positive case and the previously switched off current regulator SR1, SR2 back to the minimum current value (150 mA). If there is no correction of the web offset, then after the time period of the second timer Z2 has elapsed, the signal generator G is actuated to warn the machine operator or the main switch is actuated in order to stop the web B and to prevent further damage.
  • the complete removal of the clamping force on both web guides W1, W2 can also be arbitrarily set for threading the web B when starting up or after a shutdown. In normal operation with normal web offset, the procedure described at the beginning is used.
  • the device is designed so that it serves to guide the center of the web B and has two web guides W1, W2.
  • W1, W2 web guides
  • the control roller 1 is pivotally mounted on its support part 12, so that it is able to apply exactly parallel to the counter roller 2.
  • this mounting of the control roller 1 it is achieved that when the clamping force is increased, it is initially highest near the free edge and lower towards the center.

Landscapes

  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
EP91907813A 1990-04-19 1991-04-18 Warenbahnführer mit proportionalsteuerung des walzendrucks Expired - Lifetime EP0479992B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4012488A DE4012488C2 (de) 1990-04-19 1990-04-19 Vorrichtung und Verfahren zum Führen und Breithalten einer Warenbahn
DE4012488 1990-04-19
PCT/EP1991/000741 WO1991016258A1 (de) 1990-04-19 1991-04-18 Warenbahnführer mit proportionalsteuerung des walzendrucks

Publications (2)

Publication Number Publication Date
EP0479992A1 EP0479992A1 (de) 1992-04-15
EP0479992B1 true EP0479992B1 (de) 1995-07-19

Family

ID=6404665

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91907813A Expired - Lifetime EP0479992B1 (de) 1990-04-19 1991-04-18 Warenbahnführer mit proportionalsteuerung des walzendrucks

Country Status (4)

Country Link
EP (1) EP0479992B1 (enrdf_load_stackoverflow)
BR (1) BR9105712A (enrdf_load_stackoverflow)
DE (3) DE4012488C2 (enrdf_load_stackoverflow)
WO (1) WO1991016258A1 (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103010800A (zh) * 2012-12-27 2013-04-03 苏州弘贸纺织有限公司 一种坯布纠偏辊轴
CN103523571A (zh) * 2013-10-30 2014-01-22 吴江市科时达纺织有限公司 螺纹伸缩式吸边器
CN103950773A (zh) * 2014-04-30 2014-07-30 长兴志恒服装辅料有限公司 一种布边调整装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0718229B1 (de) * 1994-12-22 1999-06-09 ERHARDT + LEIMER GmbH Vorrichtung zum Ausstreifen einer laufenden Warenbahn
DE102007024386A1 (de) * 2007-05-25 2008-11-27 Voith Patent Gmbh Breitstrecken eines Bandes
CN113003278B (zh) * 2021-02-01 2023-05-16 兰溪市鹏凯纺织有限公司 一种根据布宽度调整的卷布机的夹边装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2801102A (en) * 1951-08-20 1957-07-30 Monforts Fa A Guiding arrangement for webs, comprising two movable pairs of rollers
DE2418695A1 (de) * 1973-04-24 1974-11-21 Alfsen & Gunderson Vorrichtung zur steuerung der breite und der querzugspannung von laufenden materialbahnen
DE2412033A1 (de) * 1974-03-13 1975-09-18 Basf Ag Anordnung zum abziehen und ausbreiten einer duennen materialbahn, insbesondere von folien an geraeten fuer die druckklischeeherstellung
DE7530871U (de) * 1974-10-04 1976-06-03 Crandall, Nelson B., Edenton, N.C. (V.St.A.) Vorrichtung zum fuehren einer sich bewegenden bahn
DE3336742C2 (de) * 1983-10-08 1985-12-05 Erhardt & Leimer GmbH, 8900 Augsburg Führungsvorrichtung für eine Warenbahn

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103010800A (zh) * 2012-12-27 2013-04-03 苏州弘贸纺织有限公司 一种坯布纠偏辊轴
CN103523571A (zh) * 2013-10-30 2014-01-22 吴江市科时达纺织有限公司 螺纹伸缩式吸边器
CN103950773A (zh) * 2014-04-30 2014-07-30 长兴志恒服装辅料有限公司 一种布边调整装置

Also Published As

Publication number Publication date
DE4012488C2 (de) 1995-02-02
DE4190843T (enrdf_load_stackoverflow) 1992-10-08
BR9105712A (pt) 1992-08-04
WO1991016258A1 (de) 1991-10-31
DE4012488A1 (de) 1991-11-07
DE59106018D1 (de) 1995-08-24
EP0479992A1 (de) 1992-04-15
DE4190843D2 (en) 1992-10-08

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