EP0013368B1 - Device for regulating the tension in a web - Google Patents

Device for regulating the tension in a web Download PDF

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Publication number
EP0013368B1
EP0013368B1 EP79105121A EP79105121A EP0013368B1 EP 0013368 B1 EP0013368 B1 EP 0013368B1 EP 79105121 A EP79105121 A EP 79105121A EP 79105121 A EP79105121 A EP 79105121A EP 0013368 B1 EP0013368 B1 EP 0013368B1
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EP
European Patent Office
Prior art keywords
valve
pneumatic
brake cylinder
sheet
tension
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
Application number
EP79105121A
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German (de)
French (fr)
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EP0013368A1 (en
Inventor
Werner Römhild
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.)
TIDLAND GmbH
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TIDLAND GmbH
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Filing date
Publication date
Priority claimed from DE19782855591 external-priority patent/DE2855591C2/en
Priority claimed from DE19782855592 external-priority patent/DE2855592C3/en
Application filed by TIDLAND GmbH filed Critical TIDLAND GmbH
Priority to AT79105121T priority Critical patent/ATE2736T1/en
Publication of EP0013368A1 publication Critical patent/EP0013368A1/en
Application granted granted Critical
Publication of EP0013368B1 publication Critical patent/EP0013368B1/en
Expired 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
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
    • B65H23/188—Registering, 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
    • B65H23/1888—Registering, 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/30—Orientation, displacement, position of the handled material
    • B65H2301/31—Features of transport path
    • B65H2301/311—Features of transport path for transport path in plane of handled material, e.g. geometry
    • B65H2301/3112—S-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/10—Size; Dimensions
    • B65H2511/11—Length
    • B65H2511/112—Length of a loop, e.g. a free loop or a loop of dancer rollers

Definitions

  • the invention relates to a device for regulating the tension of a web running from a supply roll with a dancer roller, around which the web is guided, to which a mechanical control element is connected, the deflection of which influences a pneumatic valve arrangement which, in a pressure line system provided with throttles, controls the pneumatic Pressure of a brake cylinder is applied to a pneumatic brake used to brake the web movement, the control member being movable between two end positions, each of which is acted upon by a valve connected to a pneumatic line with a throttle connected in series, both of which are connected to a compressed air container which is the brake cylinder acted upon, wherein also the valve acted upon by a reduction in the tension of the material web is switched into the line under pressure and when it is actuated by the control member, the compressed air container with the compressed air source e connects and the valve acted upon by an increase in the tension of the material web is switched into a line opening into the atmosphere and, when actuated, connects the compressed air tank to the atmosphere.
  • FR-A-1 530 726 describes a device for regulating the tension of a web running off a supply roll, a control member connected to a dancer roller being designed as a lever under the action of a tension spring.
  • the spring tension acting on the lever can be adjusted in size using a handle.
  • the lever itself is pivoted between two limit switches, so that the tension of the web can be changed either in one direction or in the other.
  • the invention has for its object to provide this known control device with an emergency stop circuit that responds sensitively even with small deflections of the dancer roller and adapts the stopping process for the material web exactly to the prevailing operating conditions.
  • control member in question is a pivotally mounted lever which is pretensioned by a tension spring and which can be pivoted between two limit switches in order to act on the relevant valves which are each switched into the pneumatic line, and in that the compressed air reservoir even acts on a second pneumatic brake cylinder via a solenoid valve that can be actuated for an emergency stop.
  • the control device according to the invention is thus equipped with two brake systems, one brake system continuously regulating the tension of the material web and the other brake system ensuring the emergency stop of the machine.
  • the emergency stop In known machines, the emergency stop always occurs suddenly after it has been triggered, with the known disadvantageous effects on the machine components and on the suddenly braked product web.
  • the emergency stop In the control device according to the invention, on the other hand, the emergency stop is switched on in a controlled manner and thus protects the entire machine and also the respectively clamped material web.
  • the compressed air container is additionally acted upon by a third, pneumatic brake cylinder via a throttle and a valve.
  • the normal stopping of the machine also takes into account the respective operating state of the machine, because the third brake cylinder provided for this purpose is acted upon by a compressed air reservoir, the internal pressure of which is adapted to the current operating state of the machine.
  • the invention is explained in more detail below using an exemplary embodiment.
  • the figure shows a circuit diagram of the most important components of the control device according to the invention.
  • a web 1 runs from a supply roll, not shown in the drawing, in the direction of arrow 2 through a machine processing the web.
  • the material web is guided around a dancer roller 3, which is rotatably attached to a pivotably mounted lever 4.
  • a further roller 5 is arranged behind the dancer roller 3 in such a way that the web in front of and behind the dancer roller is essentially parallel regardless of the position of the lever 4.
  • a tension spring 6 acts on the lever 4, the spring tension of which can be adjusted using a setting lever 7 with a scale 8.
  • the lever 4 is pivoted in the direction of the double arrow 9. During this pivoting movement, it abuts limit switches 10 and 11, which are arranged on both sides of the lever and are switched into a line 12 and 13, respectively.
  • a choke 14 is provided in series with the limit switch 10 and a choke 15 in series with the limit switch 11.
  • a main connection 15a of the pressure line 12 is connected to the pressure line 12 via a conventional service unit 16, consisting of a pressure reducing valve with a water separator.
  • a manually operated ventilation valve 17 is provided parallel to the valve 10. After the throttle 14, the line 13 opens into the pressure line 12.
  • a monometer 18 measures the pneumatic pressure present there.
  • the pressure line 12 is then guided to a compressed air tank 19 which is connected to a first brake cylinder 22 of a pneumatic brake via a further pressure line 20 and a manually operable vent valve 21.
  • the brake cylinder acts on a brake disc 23, which rotates with the supply roll for the web and is firmly connected to it.
  • the device described so far works as follows. If, for example, the tension of the web 1 decreases, the lever 4 is pivoted to the right by the tension spring 6, so that the limit switch 10 also shifts its valve to the right. As a result, the pressure passes from the main connection 15 a via the line 12 into the compressed air tank 19, and not suddenly, but with a gentle pressure increase. A pressure of, for example, 6 bar is set in the compressed air tank 19 with a time delay via the throttle 14, which acts on the brake cylinder 22 accordingly, as a result of which the web is braked accordingly. This increases the tension of the web and the lever 4 goes back to its center position shown in the drawing.
  • the pressure prevailing in the compressed air tank therefore always corresponds to the pressure with which the brake cylinder must be applied in order to maintain the set tension of the material web. Experiments have shown that this pressure decreases, the less goods are still on the supply roll.
  • a pressure line 24 is connected to a second brake cylinder 27 via a solenoid valve 25 and an adjustable pressure booster 26.
  • the solenoid valve 25 is actuated and the pressure prevailing in the compressed air tank 19 is applied to the second brake cylinder 27, as a result of which the emergency stop takes place.
  • a further pressure line 28 via a manually operable vent valve 29, an adjustable throttle 30 and a solenoid valve 31 with a third brake cylinder 32 for normal stop can be eliminated. If the normal stop is to take place, the solenoid valve 31 is actuated and the pressure prevailing in the pressure vessel 19 is smoothed via the throttle 30 to the brake cylinder 32 which stops the machine.
  • the chokes 14 and 15 are also adjustable.

Landscapes

  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zur Regelung der Spannung einer von einer Vorratsrolle ablaufenden Warenbahn mit einer Tänzerwalze, um welche die Warenbahn geführt ist, mit der ein mechanisches Steuerglied verbunden ist, dessen Ausschlag eine pneumatische Ventilanordnung beeinflußt, die in einem mit Drosseln versehenen Druckleitungssystem den pneumatischen Druck eines Bremszylinders einer zum Abbremsen der Warenbahnbewegung dienenden pneumatischen Bremse beaufschlagt, wobei das Steuerglied zwischen zwei Endstellungen bewegbar ist, denen jeweils ein in eine pneumatische Leitung eingeschaltetes Ventil mit einer in Reihe geschalteten Drossel beaufschlagtwird, welche beide mit einem Druckluftbehälter verbunden sind, der den Bremszylinder beaufschlagt, wobei ferner das bei einer Verringerung der Spannung der Warenbahn beaufschlagte Ventil in die unter Druck stehende Leitung eingeschaltet ist und bei seiner Betätigung durch das Steuerglied den Druckluftbehälter mit der Druckluftquelle verbindet und das bei einer Vergrößerung der Spannung der Warenbahn beaufschlagte Ventil in eine in die Atmosphäre mündende Leitung eingeschaltet ist und bei seiner Betätigung den Druckluftbehälter mit der Atmosphäre verbindet.The invention relates to a device for regulating the tension of a web running from a supply roll with a dancer roller, around which the web is guided, to which a mechanical control element is connected, the deflection of which influences a pneumatic valve arrangement which, in a pressure line system provided with throttles, controls the pneumatic Pressure of a brake cylinder is applied to a pneumatic brake used to brake the web movement, the control member being movable between two end positions, each of which is acted upon by a valve connected to a pneumatic line with a throttle connected in series, both of which are connected to a compressed air container which is the brake cylinder acted upon, wherein also the valve acted upon by a reduction in the tension of the material web is switched into the line under pressure and when it is actuated by the control member, the compressed air container with the compressed air source e connects and the valve acted upon by an increase in the tension of the material web is switched into a line opening into the atmosphere and, when actuated, connects the compressed air tank to the atmosphere.

Eine solche Vorrichtung beschreibt die US-A 3 630 463. Diese bekannte Vorrichtung regelt die Spannung der Warenbahn aber verhältnismäßig grob. Dies beruht derauf, daß ein relativ großer Verschiebungsweg der Tänzerwalze längs einer speziellen Tänzerwalzenführung vorgesehen ist, wobei erst an den beiden Enden dieser Waltezführung von der Tänzerwalze selbst betätigte pneumatische Ventile beaufschlagt werden. Diese Regelung ist daher für die meisten Anwendungsfälle nicht feinfühlig genug.Such a device is described in US Pat. No. 3,630,463. However, this known device regulates the tension of the material web relatively roughly. This is based on the fact that a relatively large displacement path of the dancer roller is provided along a special dancer roller guide, pneumatic valves actuated by the dancer roller itself being acted upon at both ends of this roller guide. This regulation is therefore not sensitive enough for most applications.

Die FR-A-1 530 726 beschreibt eine Vorrichtung zur Regelung der Spannung einer von einer Vorratsrolle ablaufenden Warenbahn, wobei eine mit einer Tänzerwalze verbundenes Steuerglied als unter der Wirkung einer Zugfeder stehender Hebel ausgebildet ist. Der am Hebel angreifende Federzug kann über eine Handhabe in seiner Größe eingestellt werden. Der Hebel selbst wird zwischen zwei Endschaltern verschwenkt, so daß die Spannung der Warenbahn entweder in der einen oder in der anderen Richtung verändert werden kann.FR-A-1 530 726 describes a device for regulating the tension of a web running off a supply roll, a control member connected to a dancer roller being designed as a lever under the action of a tension spring. The spring tension acting on the lever can be adjusted in size using a handle. The lever itself is pivoted between two limit switches, so that the tension of the web can be changed either in one direction or in the other.

Ausgehend von einer Vorrichtung der eingangs genannten Art liegt der Erfindung die Aufgabe zugrunde, diese bekannte Regelvorrichtung zusätzlich mit einer Nothalt-Schaltung zu versehen, die bereits bei geringen Ausschlägen der Tänzerwalze feinfühlig anspricht und den Abstoppvorgang für die Materialbahn genau an die gerade herrschenden Betriebsbedingungen anpaßt.Starting from a device of the type mentioned, the invention has for its object to provide this known control device with an emergency stop circuit that responds sensitively even with small deflections of the dancer roller and adapts the stopping process for the material web exactly to the prevailing operating conditions.

Zur Lösung dieser Aufgabe ist die Erfindung dadurch gekennzeichnet, daß das betreffende Steuerglied ein schwenkbar gelagerter und durch eine Zugfeder vorgespannter Hebel ist, der zwischen zwei Endschaltern schwenkbar ist, um die betreffenden, jeweils in die pneumatische Leitung eingeschalteten Ventile zu beaufschlagen, und daß der Druckluftgehälter selbst über ein für Nothalt betätigbares Magnetventil zusätzlich einen zweiten, pneumatischen Bremszylinder beaufschlagt.To achieve this object, the invention is characterized in that the control member in question is a pivotally mounted lever which is pretensioned by a tension spring and which can be pivoted between two limit switches in order to act on the relevant valves which are each switched into the pneumatic line, and in that the compressed air reservoir even acts on a second pneumatic brake cylinder via a solenoid valve that can be actuated for an emergency stop.

Durch diese Maßnahmen wird erreicht, daß die Regelungsvorrichtung bereits bei Zurücklegung eines sehr kleinen Weges seitens der Tänzerwalze anspricht, so daß diese praktisch nicht mehr um ihren Ruhepunkt oszilliert, sondern die Ruhelage unmittelbar nach einem nur sehr kurzen Ausschlag zu einer der beiden Seiten hin wieder einnimmt. Die Schwenkwege des Hebelarmes können entsprechend klein gewählt werden. Durch die erwähnten zusätzlichen Bauteile, nämlich das Magnetventil und den zweiten Bremszylinder mit zugehörigen Lei- ,4ungen wird auf einfache Weise ein kontrollierter Nothalt bei Betätigung des Magnetventils erzielt. Man macht sich hierbei die Eigenschaft des Hauptsystems zunutze, daß im Druckluftbehälter stets derjenige Druck ansteht, der der momentanen Spannung der Warenbahn entspricht und somit - über das Trägheitsmoment der Vorratsrolle - auch der momentan abzubremsenden Masse. Die erfindungsgemäße Regelungsvorrichtung ist somit mit zwei Bremssystemen ausgerüstet, wobei das eine Bremssystem die Spannung der Warenbahn kontinuierlich einregelt und das andere Bremssystem den Nothalt der Maschine besorgt. Bei bekannten Maschinen fällt der Nothalt nach seiner Auslösung stets schlagartig ein mit den bekannten nachteiligen Wirkungen auf die Maschinenbauteile und auf die schlagartig abgebremste Warenbahn. Bei der erfindungsgemäßen Regelungsvorrichtung wird der Nothalt dagegen kontrolliert eingeschaltet und schont somit die gesamte Maschine und auch die jeweils eingespannte Warenbahn.These measures ensure that the control device already responds when the dancer roller moves a very short distance, so that it practically no longer oscillates around its point of rest, but resumes the rest position immediately after a very short deflection to one of the two sides . The swivel paths of the lever arm can be chosen to be correspondingly small. Due to the additional components mentioned, namely the solenoid valve and the second brake cylinder with associated lines, a controlled emergency stop is easily achieved when the solenoid valve is actuated. One takes advantage of the property of the main system that the compressed air tank always has the pressure that corresponds to the current tension of the material web and thus - via the moment of inertia of the supply roll - also the mass to be braked at the moment. The control device according to the invention is thus equipped with two brake systems, one brake system continuously regulating the tension of the material web and the other brake system ensuring the emergency stop of the machine. In known machines, the emergency stop always occurs suddenly after it has been triggered, with the known disadvantageous effects on the machine components and on the suddenly braked product web. In the control device according to the invention, on the other hand, the emergency stop is switched on in a controlled manner and thus protects the entire machine and also the respectively clamped material web.

Es hat sich als vorteilhaft herausgestellt, wenn zwischen dem Magnetventil und dem zweiten Bremszylinder ein Druckübersetzer vorgesehen ist, wie dies bevorzugt wird.It has proven to be advantageous if a pressure intensifier is provided between the solenoid valve and the second brake cylinder, as is preferred.

Außerdem wird es bevorzugt, wenn für das normale Anhalten der die Warenbahn bearbeitenden Maschine der Druckluftbehälter über eine Drossel und ein Ventil zusätzlich einen dritten, pneumatischen Bremszylinder beaufschlagt. Auch das normale Anhalten der Maschine erfolgt somit unter Berücksichtigung des jeweiligen Betreibszustandes der Maschine, weil der hierfür vorgesehene dritte Bremszylinder von Druckluftbehälter beaufschlagt wird, dessen Innendruck dem momentanen Betriebszustand der Maschine angepaßt ist.In addition, it is preferred if, for the normal stopping of the machine processing the web, the compressed air container is additionally acted upon by a third, pneumatic brake cylinder via a throttle and a valve. The normal stopping of the machine also takes into account the respective operating state of the machine, because the third brake cylinder provided for this purpose is acted upon by a compressed air reservoir, the internal pressure of which is adapted to the current operating state of the machine.

Die Erfindung wird im folgenden anhand eines Ausführungsbeispieles näher erläutert. Die Figur zeigt ein Schaltschema der wichtigsten Bauelemente der erfindungsgemäßen Regelvorrichtung.The invention is explained in more detail below using an exemplary embodiment. The figure shows a circuit diagram of the most important components of the control device according to the invention.

Eine Warenbahn 1 läuft von einer zeichnerisch nicht dargestellten Vorratsrolle in Richtung des Pfeiles 2 durch eine die Warenbahn bearbeitende Maschine. Die Warenbahn ist um eine Tänzerwalze 3 geführt, die an- einem schwenkbar gelagerten Hebel 4 drehbar befestigt ist. Hinter der Tänzerwalze 3 ist eine weitere Walze 5 derart angeordnet, daß die Warenbahn vor und hinter der Tänzerwalze unabhängig von der Stellung des Hebels 4 im wesentlichen parallel ist.A web 1 runs from a supply roll, not shown in the drawing, in the direction of arrow 2 through a machine processing the web. The material web is guided around a dancer roller 3, which is rotatably attached to a pivotably mounted lever 4. A further roller 5 is arranged behind the dancer roller 3 in such a way that the web in front of and behind the dancer roller is essentially parallel regardless of the position of the lever 4.

Am Hebel 4 greift eine Zugfeder 6 an, deren Federzug über einen Einstellhebel 7 mit Skala 8 einstellbar ist.A tension spring 6 acts on the lever 4, the spring tension of which can be adjusted using a setting lever 7 with a scale 8.

Abhängig von der Spannung der Warenbahn 1 wird der Hebel 4 in Richtung des Doppelpfeiles 9 verschwenkt. Bei dieser Schwenkbewegung stößt er an beidseits des Hebels angeordnete Endschalter 10 bzw. 11 an, die in eine Leitung 12 bzw. 13 eingeschaltet sind. In Serie zum Endschalter 10 ist eine Drossel 14 vorgesehen und in Serie zum Endschalter 11 eine Drossel 15.Depending on the tension of the web 1, the lever 4 is pivoted in the direction of the double arrow 9. During this pivoting movement, it abuts limit switches 10 and 11, which are arranged on both sides of the lever and are switched into a line 12 and 13, respectively. A choke 14 is provided in series with the limit switch 10 and a choke 15 in series with the limit switch 11.

Ein Hauptanschluß 15a der Druckleitung 12 ist über eine übliche Serviceeinheit 16, bestehend aus einem Druckminderventil mit Wasserabscheider, mit der Druckleitung 12 verbunden. Parallel zum Ventil 10 ist ein von Hand betätigbares Belüftungsventil 17 vorgesehen. Hinter der Drossel 14 mündet die Leitung 13 in die Druckleitung 12. Ein Monometer 18 mißt den dort vorhandenen pneumatischen Druck.A main connection 15a of the pressure line 12 is connected to the pressure line 12 via a conventional service unit 16, consisting of a pressure reducing valve with a water separator. A manually operated ventilation valve 17 is provided parallel to the valve 10. After the throttle 14, the line 13 opens into the pressure line 12. A monometer 18 measures the pneumatic pressure present there.

Die Druckleitung 12 ist dann zu einem Druckluftbehälter 19 geführt, der über eine weitere Druckleitung 20 und ein von Hand betätigbares Entlüftungsventil 21 mit einem ersten Bremszylinder 22 einer pneumatischen Bremse verbunden ist. Der Bremszylinder wirkt auf eine Bremsscheibe 23, die sich mit der Vorratsrolle für die Warenbahn dreht und mit ihr fest verbunden ist.The pressure line 12 is then guided to a compressed air tank 19 which is connected to a first brake cylinder 22 of a pneumatic brake via a further pressure line 20 and a manually operable vent valve 21. The brake cylinder acts on a brake disc 23, which rotates with the supply roll for the web and is firmly connected to it.

Die bisher beschriebene Vorrichtung arbeitet wie folgt. Verringert sich beispielsweise die Spannung der Warenbahn 1, so wird der Hebel 4 von der Zugfeder 6 nach rechts verschwenkt, so daß der Endschalter 10 sein Ventil ebenfalls nach rechts verschiebt. Dadurch gelangt der Druck von dem Hauptanschluß 1 5a über die Leitung 12 in den Druckluftbehälter 19, und zwar nicht schlagartig sondern mit sachtem Druckanstieg. Im Druckluftbehälter 19 stellt sich zeitlich verzögert über die Drossel 14 ein Druck von beispielsweise 6 bar ein, der den Bremszylinder 22 entsprechend beaufschlagt, wodurch die Warenbahn entsprechend abgebremst wird. Dadurch erhöht sich die Spannung der Warenbahn und der Hebel 4 geht wieder in seine zeichnerisch dargestellte Mittellage.The device described so far works as follows. If, for example, the tension of the web 1 decreases, the lever 4 is pivoted to the right by the tension spring 6, so that the limit switch 10 also shifts its valve to the right. As a result, the pressure passes from the main connection 15 a via the line 12 into the compressed air tank 19, and not suddenly, but with a gentle pressure increase. A pressure of, for example, 6 bar is set in the compressed air tank 19 with a time delay via the throttle 14, which acts on the brake cylinder 22 accordingly, as a result of which the web is braked accordingly. This increases the tension of the web and the lever 4 goes back to its center position shown in the drawing.

Erhöht sich die Spannung der Warenbahn 1, so wird dadurch der Hebel 4 nach links verschwenkt und betätigt den Endschalter 11 mit seinem Ventil. Der im Druckluftbehälter 19 eingestellte Druck entweicht jetzt über das Ventil 11 an die Atmosphäre, wodurch der Druck im Druckluftbehälter und damit auch der am Bremszylinder 22 anstehende Druck entsprechend verringert wird. Auch dies erfolgt zeitlich verzögert über die Drossel 15. Die Bremswirkung läßt also nach, bis die Spannung der Warenbahn 1 wieder den über den Hebel 7 eingestellten Sollwert erreicht hat. Es sei erwähnt, daß vorher das Ventil 10 wieder die zeichnerisch dargestellte Lage eingenommen hatte, so daß der Druckluftbehälter 19 nicht mehr mit dem Hauptanschluß 15a verbunden war.If the tension of the web 1 increases, the lever 4 is thereby pivoted to the left and actuates the limit switch 11 with its valve. The pressure set in the compressed air tank 19 now escapes to the atmosphere via the valve 11, as a result of which the pressure in the compressed air tank and thus also the pressure present at the brake cylinder 22 are correspondingly reduced. This also takes place with a time delay via the throttle 15. The braking effect therefore diminishes until the tension of the material web 1 has again reached the setpoint set via the lever 7. It should be mentioned that the valve 10 had previously assumed the position shown in the drawing, so that the compressed air tank 19 was no longer connected to the main connection 15a.

Der im Druckluftbehälter herrschende Druck entspricht also stets demjenigen Druck, mit dem der Bremszylinder beaufschlagt werden muß, um die eingestellte Spannung der Warenbahn zu halten. Versuche haben gezeigt, daß dieser Druck kleiner wird, je weniger Ware sich noch auf der Vorratsrolle befindet.The pressure prevailing in the compressed air tank therefore always corresponds to the pressure with which the brake cylinder must be applied in order to maintain the set tension of the material web. Experiments have shown that this pressure decreases, the less goods are still on the supply roll.

Diese Verhältnisse kann man auch ausnutzen, um eine Schnellbremsung oder auch eine Normalbremsung durchzuführen. Zur Schnellbremsung ist eine Druckleitung 24 über ein Magnetventil 25 und einen einstellbaren Druckübersetzer 26 mit einem zweiten Bremszylinder 27 verbunden. Zur Schnellbremsung wird das Magnetventil 25 betätigt und der im Druckluftbehälter 19 herrschende Druck wird an den zweiten Bremszylinder 27 angelegt, wodurch der Nothalt erfolgt.These conditions can also be used to carry out rapid braking or normal braking. For rapid braking, a pressure line 24 is connected to a second brake cylinder 27 via a solenoid valve 25 and an adjustable pressure booster 26. For rapid braking, the solenoid valve 25 is actuated and the pressure prevailing in the compressed air tank 19 is applied to the second brake cylinder 27, as a result of which the emergency stop takes place.

Für den Normalhalt kann eine weitere Druckleitung 28 über ein von Hand betätigbares Entlüftungsventil 29, eine einstellbare Drossel 30 und ein Magnetventil 31 mit einem dritten Bremszylinder 32 für Normalhalt verdunden sein. Soll der Normalhalt erfolgen, so wird das Magnetventil 31 betätigt und der im Druckbehälter 19 herrschende Druck wird über die Drossel 30 geglättet an den Bremszylinder 32 gegeben, der die Maschine anhält.For the normal stop, a further pressure line 28 via a manually operable vent valve 29, an adjustable throttle 30 and a solenoid valve 31 with a third brake cylinder 32 for normal stop can be eliminated. If the normal stop is to take place, the solenoid valve 31 is actuated and the pressure prevailing in the pressure vessel 19 is smoothed via the throttle 30 to the brake cylinder 32 which stops the machine.

Auch die Drosseln 14 und 15 sind einstellbar.The chokes 14 and 15 are also adjustable.

Claims (3)

1. Device for regulating the tension of a sheet of material (1) running off from a storage roll, comprising a compensating roller (3) around which the sheet of material (1) is guided, with which roller a mechanical control element (4) is connected, the deflection of which influences a pneumatic valve assembly (10, 11) which, in a pressurized piping system equipped with throttles (14, 15), acts upon the pneumatic pressure of a brake cylinder (22) of a pneumatic brake serving for braking the movement of the sheet of material, wherein the control element (4) is movable between two limiting positions, in each of which a valve (10, 11) connected into a pneumatic line (12, 13) and having a throttle (14, 15) connected in series is acted upon, both of which valves are connected with a pressurised air vessel (19) which acts upon the brake cylinder (22), wherein furthermore the valve (10) which is acted upon when the stress in the sheet of material (1) decreases is connected into the pressurized line (12) and, when it is actuated by the control element (4), connects the pressurized air vessel (19) with the pressurized air source (15a), and the valve (11) which is acted upon when the stress in the sheet of material (1) increases is connected into a line (13) leading to atmosphere and, when it is actuated, connects the pressurized air vessel (19) with atmosphere, characterized in that the relevant control element is a pivotally mounted lever (4) prestressed by a tension spring (6), which lever is pivotal between two limit switches in order to act upon the relevant valves (10, 11) each connected into the pneumatic line (12, 13), and that the pressurized air vessel (19) itself acts, via a solenoid valve (25) actuatable for emergency stop, additionally upon a second, pneumatic brake cylinder (27).
2. Device according to Claim 1, characterized in that a pressure converter (26) is provided between the solenoid valve (25) and the second brake cylinder (27).
3. Device according to Claim 1 or 2, characterized in that, for the normal stopping of the machine processing the sheet of material, the pressurized air vessel (19) acts via a throttle (30) and a valve (31), additionally upon a third, pneumatic brake cylinder (32).
EP79105121A 1978-12-22 1979-12-13 Device for regulating the tension in a web Expired EP0013368B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79105121T ATE2736T1 (en) 1978-12-22 1979-12-13 DEVICE FOR ADJUSTING THE TENSION OF A WEB.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE2855591 1978-12-22
DE19782855591 DE2855591C2 (en) 1978-12-22 1978-12-22 Device for braking a web processing machine
DE2855592 1978-12-22
DE19782855592 DE2855592C3 (en) 1978-12-22 1978-12-22 Device for measuring and / or regulating the tension of a web of material running off a supply roll

Publications (2)

Publication Number Publication Date
EP0013368A1 EP0013368A1 (en) 1980-07-23
EP0013368B1 true EP0013368B1 (en) 1983-03-09

Family

ID=25777008

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79105121A Expired EP0013368B1 (en) 1978-12-22 1979-12-13 Device for regulating the tension in a web

Country Status (3)

Country Link
US (1) US4288045A (en)
EP (1) EP0013368B1 (en)
DE (1) DE2965013D1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3608182A1 (en) * 1986-03-12 1987-10-01 Roland Man Druckmasch DEVICE FOR REGULATING THE TENSION OF A PRESSURE CARRIER RAIL WITH AN EMERGENCY STOP DEVICE
JP2981221B1 (en) * 1998-11-25 1999-11-22 株式会社東京機械製作所 Web paper tension control device for rotary press
CN106926581B (en) * 2015-12-30 2018-10-30 宁波欣达印刷机器有限公司 Method for the protection of roll type intaglio press fracture
JP6719253B2 (en) * 2016-03-30 2020-07-08 理想科学工業株式会社 Transport device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2677080A (en) * 1949-09-17 1954-04-27 Allis Chalmers Mfg Co Strip tensioning system responsive to two fluid pressures
US3101915A (en) * 1962-05-23 1963-08-27 Cameron Machine Co Apparatus for controlling tension in a running web
GB1046803A (en) * 1963-07-03 1966-10-26 Timsons Holdings Ltd Means controlling tension in a travelling web during drawing from a reel of re-reeling
BE699320A (en) * 1966-06-02 1967-11-16
US3630463A (en) * 1969-09-22 1971-12-28 Faustel Inc Web-tension control apparatus
US3784123A (en) * 1971-04-05 1974-01-08 Whiteley Ind Inc Tension control system
DE2411482C3 (en) * 1974-03-11 1981-08-06 Maschinenfabrik Goebel Gmbh, 6100 Darmstadt Device for maintaining tension in a web of paper, film or the like.

Also Published As

Publication number Publication date
US4288045A (en) 1981-09-08
EP0013368A1 (en) 1980-07-23
DE2965013D1 (en) 1983-04-14

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