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EP0104365B1 - Device for intermittently unwinding and cutting a film from a roll, particularly for a vacuum casting machine - Google Patents

Device for intermittently unwinding and cutting a film from a roll, particularly for a vacuum casting machine Download PDF

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Publication number
EP0104365B1
EP0104365B1 EP83107558A EP83107558A EP0104365B1 EP 0104365 B1 EP0104365 B1 EP 0104365B1 EP 83107558 A EP83107558 A EP 83107558A EP 83107558 A EP83107558 A EP 83107558A EP 0104365 B1 EP0104365 B1 EP 0104365B1
Authority
EP
European Patent Office
Prior art keywords
suction
basket
frame
film
partial vacuum
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
EP83107558A
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German (de)
French (fr)
Other versions
EP0104365A2 (en
EP0104365A3 (en
Inventor
Günter Messerschmidt
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.)
Heinrich Wagner Sinto Maschinenfabrik GmbH
Original Assignee
Heinrich Wagner Sinto Maschinenfabrik 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 Heinrich Wagner Sinto Maschinenfabrik GmbH filed Critical Heinrich Wagner Sinto Maschinenfabrik GmbH
Priority to AT83107558T priority Critical patent/ATE23139T1/en
Publication of EP0104365A2 publication Critical patent/EP0104365A2/en
Publication of EP0104365A3 publication Critical patent/EP0104365A3/en
Application granted granted Critical
Publication of EP0104365B1 publication Critical patent/EP0104365B1/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
    • B65H20/00—Advancing webs
    • B65H20/12—Advancing webs by suction roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding

Definitions

  • the invention relates to a device for intermittently pulling and cutting off film sections from a film roll, in particular for feeding them to a vacuum casting mold system, with a frame provided with suction openings, which from a position adjacent to the roll, in which it grips a film section by suction, from the Roll can be moved away into a position presenting the film section of a cutting device.
  • a device of this type is known from DE-B 2410362. It is used to intermittently pull off and cut off film sections from a film roll, which are placed in a casting mold box, molded onto a model by heating and deep-drawing, and then backfilled with the free sand. By evacuating the molding sand, which is now sealed by the film, a casting mold that exactly replicates the model is obtained and can be removed from the model.
  • a lifting frame with lifting and lowering suction heads is used for the gradual removal of the film sections, which is also provided with the heating device and transports the respectively taken film section to the molding box.
  • this frame is moved over the casting box, a subsequent new film section is taken along and pulled over a table, from which the returning lifting frame can then grip and take this next film section by means of the suction cups.
  • the invention has for its object to provide a device of the type mentioned, in which the film can be reliably removed from the roll without wrinkles and without the risk of damage and passed on for further processing.
  • this object is achieved in that a number of rectangular suction frames is combined to form a basket which is polygonal in cross-section and is intermittently rotatably mounted next to the film roll about its central axis, and in that the suction of each suction frame is controlled as a function of the rotation of the basket, that each suction frame is pressurized during part of the circulation of the basket and is depressurized during the rest of the circulation.
  • each suction frame one after the other detects an associated film section in a substantially perpendicular or steeply inclined arrangement without any parallel displacement between the film and the suction frame or any other base. This prevents damage and wrinkles.
  • the film is then turned into a e.g. taken horizontally upward position in which the cutting and transfer to other processing facilities can take place.
  • suction frames are preferably joined together to form a basket with a square cross section, which is rotated in steps of 90 °.
  • the control of the vacuum application of the suction frame corresponding to the rotation of the basket can be carried out by valves with actuating pushes which cooperate with the actuators assigned to the respective vertical and horizontal upper position of the respective suction frame.
  • a lifting frame with suction openings can be arranged above the device provided according to the invention in order to remove the cut-off piece of film from the suction frame of the basket located at the top.
  • the lifting frame can drive a cutting device and / or actuate a valve to switch off the vacuum of the suction frame.
  • the device consists essentially of four rectangular suction frames 1, which are assembled into a cuboid basket 2 around a centrally arranged shaft 3.
  • the suction frames are formed from rectangular tubes, which are provided on the suction side with a large number of small bores 13 arranged in rows and on the opposite side have a connection to the vacuum network.
  • the shaft 3 is rotatably supported on both sides in bearings 4 and coupled at one end to an electric or hydraulic actuator 5, through which the basket 2 can be rotated step by step by 90 °.
  • the shaft 3 is designed as a hollow shaft with a vacuum channel 6 and is connected to the vacuum network via a tubular swivel joint 7.
  • a separate vacuum line 8 with a mechanically operated shut-off valve A, B, C, D with actuating plungers 9 leads to each of the four suction frames on this side.
  • the basket 2 is arranged next to the film roll 10 such that the through a deflection roller 15 formed feed point for the film is located in the area of the lower end of the vertically standing suction frame c facing each of the film roll 10.
  • the basket 2 is rotated in the direction of arrow 16 in steps of 90 °.
  • the vacuum in the individual suction frame 1 is switched on and off separately by the valves A to D. 2
  • valves A and B are closed, since there is no film in the area of the associated suction frames a and b. Due to the previous quarter rotation of the basket, in which a film section was sucked, held and taken along by the suction frame d, the subsequent film section running perpendicularly in FIG.
  • a lifting frame 14 which can be raised and lowered by means of an actuating cylinder 17 is arranged above the basket 2 and is formed from rectangular tubes with suction openings 17 and is connected to the vacuum shaft by a flexible hose 18.
  • a lifting and lowering cutting device with a heatable cutting wire 12 is arranged above the basket 2 in the area of the upper corner of the basket 2 closer to the film roll 10.
  • the spring-suspended cutting device with the cutting wire 12 is taken along by a driver 19, so that the film spanning the angular recess between the suction frame c and d is cut. Furthermore, the plunger 9 of the valve D is actuated by the downward movement of the lifting frame 14, thereby blocking the vacuum connection to the suction frame d located above.
  • the unit consisting of lifting frame 14 and heating screen 20 is then moved over the molding box, not shown, where the film heated by heating screen 20 is thermoformed onto the model.
  • the suction frame c now reaches the upper horizontal position under the lifting frame 14, while the suction frame b reaches the vertical position and rests against the next pulled-off film section and this opens the valve B through the control curve 11 sucks and holds.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Continuous Casting (AREA)
  • Physical Vapour Deposition (AREA)
  • Advancing Webs (AREA)

Abstract

1. Device for intermittently unwinding and cutting film sections from a film roll (10), in particular for supply thereof to a vacuum casting apparatus, comprising a frame (1) which is provided with suction openings (13) and which is movable from a position adjacent the roller in which it engages a film section by suction away from the roller into a position offering the film section to a cutting means (12), characterized in that a plurality of rectangular suction frames (1) are assembled to form a basket (2) which is of polygonal cross-section and which is mounted rotatably intermittently about its centre axis adjacent the film roll (10) and that the subjection of each suction frame (1) to partial vacuum is controlled in dependance upon the rotation of the basket (2) in such a manner that each suction frame during a portion of the rotating of the basket is subjected to partial vacuum and during the remaining portion of the rotation is pressureless.

Description

Die Erfindung betrifft eine Vorrichtung zum intermittierenden Abziehen und Abschneiden von Folienabschnitten von einer Folienrolle, insbesondere für deren Zuführung zu einer Vakuumgiessformanlage, mit einem mit Saugöffnungen versehenen Rahmen, der aus einer der Rolle benachbarten Stellung, in der er einen Folienabschnitt durch Ansaugen ergreift, von der Rolle weg in eine den Folienabschnitt einer Schneideinrichtung darbietende Stellung bewegbar ist.The invention relates to a device for intermittently pulling and cutting off film sections from a film roll, in particular for feeding them to a vacuum casting mold system, with a frame provided with suction openings, which from a position adjacent to the roll, in which it grips a film section by suction, from the Roll can be moved away into a position presenting the film section of a cutting device.

Eine Vorrichtung dieser Art ist aus DE-B 2410362 bekannt. Sie dient dazu, von einer Folienrolle intermittierend Folienabschnitte abzuziehen und abzuschneiden, die in einen Giessformkasten eingebracht, durch Aufheizen und Tiefziehen an ein Modell angeformt und dann mit Bindung mit dem freien Sand hinterfüllt werden. Durch Evakuieren des nun durch die Folie abgedichteten Formsandes erhält man eine das Modell exakt nachbildende, formstabile und vom Modell abnehmbare Giessform.A device of this type is known from DE-B 2410362. It is used to intermittently pull off and cut off film sections from a film roll, which are placed in a casting mold box, molded onto a model by heating and deep-drawing, and then backfilled with the free sand. By evacuating the molding sand, which is now sealed by the film, a casting mold that exactly replicates the model is obtained and can be removed from the model.

Bei der bekannten Vorrichtung dient zum schrittweisen Abziehen der Folienabschnitte ein Hubrahmen mit heb- und senkbaren Saugköpfen, der auch mit der Heizeinrichtung versehen ist und den jeweils ergriffenen Folienabschnitt zum Formkasten transportiert. Beim Verfahren dieses Rahmens über den Giesskasten wird jeweils ein nachfolgender neuer Folienabschnitt mitgenommen und über einen Tisch gezogen, von welchem dann der zurückkehrende Hubrahmen mittels der Saugnäpfe diesen nächsten Folienabschnitt ergreifen und mitnehmen kann.In the known device, a lifting frame with lifting and lowering suction heads is used for the gradual removal of the film sections, which is also provided with the heating device and transports the respectively taken film section to the molding box. When this frame is moved over the casting box, a subsequent new film section is taken along and pulled over a table, from which the returning lifting frame can then grip and take this next film section by means of the suction cups.

Da bei dieser bekannten Vorrichtung die Folie in horizontaler Bewegung über einen Tisch gezogen wird und an diesem reibend anliegt, kann es vorkommen, dass die Folie beschädigt wird oder aber verrutscht und Falten wirft. Dies kann zu einem ungleichmässigen Erfassen der Folie mittels der Saugnäpfe, zu einem ungleichmässigen Aufheizen und zu Versagern beim anschliessenden Tiefziehen im Formkasten führen.Since in this known device the film is pulled in a horizontal movement over a table and abuts it frictionally, it can happen that the film is damaged or slips and wrinkles. This can lead to uneven gripping of the film by means of the suction cups, to uneven heating and to failure during the subsequent deep drawing in the molding box.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung der genannten Art zu schaffen, bei der die Folie zuverlässig faltenfrei und ohne Gefahr von Beschädigungen von der Rolle abgezogen und für weitere Verarbeitung weitergegeben werden kann.The invention has for its object to provide a device of the type mentioned, in which the film can be reliably removed from the roll without wrinkles and without the risk of damage and passed on for further processing.

Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass eineAnzahl rechteckigersaugrahmen zu einem im Querschnitt polygonalen Korb zusammengefügt ist, der um seine Mittelachse intermittierend drehbar neben der Folienrolle gelagert ist, und dass die Beaufschlagung jedes Saugrahmens mit Unterdruck in Abhängigkeit von der Drehung des Korbes derart gesteuert ist, dass jeder Saugrahmen während eines Teils des Umlaufes des Korbes mit Unterdruck beaufschlagt und während des restlichen Teils des Umlaufes drucklos ist.According to the invention, this object is achieved in that a number of rectangular suction frames is combined to form a basket which is polygonal in cross-section and is intermittently rotatably mounted next to the film roll about its central axis, and in that the suction of each suction frame is controlled as a function of the rotation of the basket, that each suction frame is pressurized during part of the circulation of the basket and is depressurized during the rest of the circulation.

Durch diese Konstruktion wird der Vorteil erreicht, dass entsprechend der schrittweisen Drehung des Korbes nacheinander jeder Saugrahmen einen zugehörigen Folienabschnitt in einer im wesentlichen senkrecht stehenden oder steil geneigten Anordnung erfasst, ohne dass irgendeine Parallelverschiebung zwischen der Folie und dem Saugrahmen oder einer sonstigen Unterlage stattfindet. Dadurch werden Beschädigungen und Faltenbildungen vermieden. In diesem vom Saugrahmen sicher ergriffenen Zustand wird die Folie dann durch weitere Drehung des Korbes in eine z.B. horizontal nach oben gerichtete Stellung mitgenommen, in der das Abschneiden sowie die Übergabe an weitere Verarbeitungseinrichtungen erfolgen kann.This construction achieves the advantage that, in accordance with the gradual rotation of the basket, each suction frame one after the other detects an associated film section in a substantially perpendicular or steeply inclined arrangement without any parallel displacement between the film and the suction frame or any other base. This prevents damage and wrinkles. In this state, securely gripped by the suction frame, the film is then turned into a e.g. taken horizontally upward position in which the cutting and transfer to other processing facilities can take place.

Vorzugsweise sind vier Saugrahmen zu einem im Querschnitt quadratischen Korb zusammengefügt, der in Schritten von 90° gedreht wird. Die der Drehung des Korbes entsprechende Steuerung der Unterdruckbeaufschlagung der Saugrahmen kann durch Ventile mit Betätigungsstössein erfolgen, die mit der jeweils lotrechten und horizontal oberen Stellung des jeweiligen Sau g-rahmens zugeordneten Betätigungsgliedern zusammenwirken.Four suction frames are preferably joined together to form a basket with a square cross section, which is rotated in steps of 90 °. The control of the vacuum application of the suction frame corresponding to the rotation of the basket can be carried out by valves with actuating pushes which cooperate with the actuators assigned to the respective vertical and horizontal upper position of the respective suction frame.

Ein Hubrahmen mit Saugöffnungen, wie im Prinzip aus DE-B 2410362 bekannt, kann oberhalb der erfindungsgemäss vorgesehenen Vorrichtung angeordnet sein, um das abgeschnittene Folienstück von dem jeweils oben liegenden Saugrahmen des Korbes abzunehmen. Der Hubrahmen kann bei seiner Abwärtsbewegung den Antrieb einer Schneidvorrichtung und/oder die Betätigung eines Ventils zum Abschalten des Unterdruckes des Saugrahmens bewirken.A lifting frame with suction openings, as known in principle from DE-B 2410362, can be arranged above the device provided according to the invention in order to remove the cut-off piece of film from the suction frame of the basket located at the top. During its downward movement, the lifting frame can drive a cutting device and / or actuate a valve to switch off the vacuum of the suction frame.

Eine Ausführungsform der Erfindung wird anhand der Zeichnungen näher erläutert.

  • Fig. 1 zeigt eine Seitenansicht der erfindungsgemässen Vorrichtung.
  • Fig. 2 zeigt einen lotrechten Schnitt durch die Vorrichtung in der zur Ebene von Fig. 1 senkrechten Richtung.
An embodiment of the invention is explained in more detail with reference to the drawings.
  • 1 shows a side view of the device according to the invention.
  • FIG. 2 shows a vertical section through the device in the direction perpendicular to the plane of FIG. 1.

Die Vorrichtung besteht im wesentlichen aus vier rechteckigen Saugrahmen 1, die zu einem quaderförmigen Korb 2 um eine zentral angeordnete Welle 3 zusammengefügt sind. Die Saugrahmen sind aus Rechteckrohren gebildet, die an der Saugseite mit einer grossen Anzahl kleiner, reihenweise angeordneter Bohrungen 13 versehen sind und an der Gegenseite einen Anschluss an das Vakuumnetz haben.The device consists essentially of four rectangular suction frames 1, which are assembled into a cuboid basket 2 around a centrally arranged shaft 3. The suction frames are formed from rectangular tubes, which are provided on the suction side with a large number of small bores 13 arranged in rows and on the opposite side have a connection to the vacuum network.

Die Welle 3 ist an beiden Seiten in Lagern 4 drehbar gelagert und an einem Ende mit einem elektrischen oder hydraulischen Stellantrieb 5 gekuppelt, durch den der Korb 2 schrittweise um jeweils 90° gedreht werden kann. An der Gegenseite ist die Welle 3 als Hohlwelle mit einem Unterdruckkanal 6 ausgebildet und über ein Rohrdrehgelenk 7 mit dem Vakuumnetz verbunden. An dieser Seite führt zu jedem der vier Saugrahmen eine separate Vakuumleitung 8 mit einem mechanisch betätigten Absperrventil A, B, C, D mit Betätigungsstösseln 9.The shaft 3 is rotatably supported on both sides in bearings 4 and coupled at one end to an electric or hydraulic actuator 5, through which the basket 2 can be rotated step by step by 90 °. On the opposite side, the shaft 3 is designed as a hollow shaft with a vacuum channel 6 and is connected to the vacuum network via a tubular swivel joint 7. A separate vacuum line 8 with a mechanically operated shut-off valve A, B, C, D with actuating plungers 9 leads to each of the four suction frames on this side.

Der Korb 2 ist gemäss Fig. 2 derart neben der Folienrolle 10 angeordnet, dass sich die durch eine Umlenkrolle 15 gebildete Zuführungsstelle für die Folie im Bereich des unteren Endes des jeweils der Folienrolle 10 zugewendeten, lotrecht stehenden Saugrahmens c befindet. Der Korb 2 wird in Richtung des Pfeils 16 in Schritten von 90° gedreht. Im Verlauf dieser Drehung wird durch die Ventile A bis D das Vakuum in den einzelnen Saugrahmen 1 getrennt zu- und abgeschaltet. In Fig. 2 sind die Ventile A und B geschlossen, da sich im Bereich der zugehörigen Saugrahmen a und b keine Folie befindet. Durch die vorhergehende Vierteldrehung des Korbes, bei der ein Folienabschnitt von dem Saugrahmen d angesaugt, festgehalten und mitgenommen wurde, ist von der Folienrolle 10 der nachfolgende, in Fig. 2 lotrecht verlaufende Folienabschnitt abgerollt worden. Dieser soeben abgerollte Abschnitt befindet sich nun im Bereich des Saugrahmens c. Das zugehörige Ventil C wird entweder während der Drehbewegung über eine Kurve 11 oder nach erfolgter Drehung durch einen stationären Zylinder geöffnet, so dass nun die Folie vom Saugrahmen c angesaugt und festgehalten wird.According to FIG. 2, the basket 2 is arranged next to the film roll 10 such that the through a deflection roller 15 formed feed point for the film is located in the area of the lower end of the vertically standing suction frame c facing each of the film roll 10. The basket 2 is rotated in the direction of arrow 16 in steps of 90 °. In the course of this rotation, the vacuum in the individual suction frame 1 is switched on and off separately by the valves A to D. 2, valves A and B are closed, since there is no film in the area of the associated suction frames a and b. Due to the previous quarter rotation of the basket, in which a film section was sucked, held and taken along by the suction frame d, the subsequent film section running perpendicularly in FIG. 2 has been unrolled from the film roll 10. This section that has just been rolled is now in the area of the suction frame c. The associated valve C is opened either during the rotary movement via a curve 11 or after rotation by a stationary cylinder, so that the film is now sucked in and held by the suction frame c.

Oberhalb des Korbes 2 ist ein mittels Stellzylinder 17 heb- und senkbarer Hubrahmen 14 angeordnet, der aus Rechteckrohren mit Saugöffnungen 17 ausgebildet und durch einen flexiblen Schlauch 18 an die Unterdruckwelle angeschlossen ist.A lifting frame 14 which can be raised and lowered by means of an actuating cylinder 17 is arranged above the basket 2 and is formed from rectangular tubes with suction openings 17 and is connected to the vacuum shaft by a flexible hose 18.

Ferner ist oberhalb des Korbes 2 im Bereich der der Folienrolle 10 näherliegenden oberen Ecke des Korbes 2 eine heb- und senkbare Schneidvorrichtung mit einem heizbaren Schneidedraht 12 angeordnet.Furthermore, a lifting and lowering cutting device with a heatable cutting wire 12 is arranged above the basket 2 in the area of the upper corner of the basket 2 closer to the film roll 10.

Bei der Abwärtsbewegung des Hubrahmens 14 wird durch einen Mitnehmer 19 die federnd aufgehängte Schneidvorrichtung mit dem Schneiddraht 12 mitgenommen, so dass die die Winkelaussparung zwischen den Saugrahmen c und d überspannende Folie durchgeschnitten wird. Ferner wird durch die Abwärtsbewegung des Hubrahmens 14 der Stössel 9 des Ventils D betätigt und dadurch die Vakuumverbindung zum oben liegenden Saugrahmen d gesperrt. Der bei seiner Abwärtsbewegung auf den oberen Saugrahmen d auftreffende Hubrahmen 14, der im geeigneten Zeitpunkt mit Unterdruck beaufschlagt wird, übernimmt nun den abgeschnittenen Folienabschnitt vom Saugrahmen d und bringt ihn bei der anschliessenden Aufwärtsbewegung in den Bereich eines über den Hubrahmen 14 stationär angeordneten Heizschirmes 20. Die aus Hubrahmen 14 und Heizschirm 20 bestehende Einheit wird dann über den nicht dargestellten Formkasten verfahren, wo die durch den Heizschirm 20 aufgeheizte Folie auf das Modell tiefgezogen wird.During the downward movement of the lifting frame 14, the spring-suspended cutting device with the cutting wire 12 is taken along by a driver 19, so that the film spanning the angular recess between the suction frame c and d is cut. Furthermore, the plunger 9 of the valve D is actuated by the downward movement of the lifting frame 14, thereby blocking the vacuum connection to the suction frame d located above. The lifting frame 14, which strikes the upper suction frame d during its downward movement and is subjected to negative pressure at the appropriate time, now takes over the cut-off film section from the suction frame d and, during the subsequent upward movement, brings it into the area of a heating screen 20 which is stationary over the lifting frame 14. The unit consisting of lifting frame 14 and heating screen 20 is then moved over the molding box, not shown, where the film heated by heating screen 20 is thermoformed onto the model.

Bei der Aufwärtsbewegung des Hubrahmens 14 wird die Schneidvorrichtung 12 durch die Federn in die Ausgangsstellung zurückgezogen.During the upward movement of the lifting frame 14, the cutting device 12 is pulled back into the starting position by the springs.

Bei der nächsten Vierteldrehung des Korbes 2 gelangt nun der Saugrahmen c in die obere horizontale Stellung unter den Hubrahmen 14, während der Saugrahmen b in die lotrechte Stellung gelangt und sich an den nächsten abgezogenen Folienabschnitt anlegt und diesen bei Öffnung des Ventils B durch die Steuerkurve 11 ansaugt und festhält.At the next quarter-turn of the basket 2, the suction frame c now reaches the upper horizontal position under the lifting frame 14, while the suction frame b reaches the vertical position and rests against the next pulled-off film section and this opens the valve B through the control curve 11 sucks and holds.

Claims (7)

1. Device for intermittently unwinding and cutting film sections from a film roll (10), in particular for supply thereof to a vacuum casting apparatus, comprising a frame (1) which is provided with suction openings (13) and which is movable from a position adjacent the roller in which it engages a film section by suction away from the roller into a position offering the film section to a cutting means (12), characterized in that a plurality of rectangular suction frames (1) are assembled to form a basket (2) which is of polygonal cross-section and which is mounted rotatably intermittently about its centre axis adjacent the film roll (10) and that the subjection of each suction frame (1) to partial vacuum is controlled in dependence upon the rotation of the basket (2) in such a manner that each suction frame during a portion of the rotating of the basket is subjected to partial vacuum and during the remaining portion of the rotation is pressureless.
2. Device according to claim 1, characterized in that four suction frames (1) are assembled to form a basket (2) which is of square cross-section and which is driven rotatably in steps of 90° and that the partial vacuum control is constructed in such a manner that each suction frame is subjected to partial vacuum on or after reaching the position vertically facing the film roll and remains subjected to partial vacuum until the upper horizontal position is reached.
3. Device according to claim 1 or 2, characterized in that each suction frame (1) is connected to the hollow shaft (3) as centre axis of the basket (2) connected to the partial vacuum source via lines with shut-off valves (A, B, C, D) with actuating push members (9) and that in each case actuating means (11, 14) are associated with the vertical position facing the film roll (10) and the horizontal upper position of the suction frames (1) for actuating the push members.
4. Device according to any one of claims 1 to 3, characterized in that above the basket (2) a lifting frame (14) is arranged with suction openings (15) for removing the cut-off film section from the respective upper suction frame of the basket (2).
5. Device according to any one of claims 1 to 4, characterized in that the cutting means (12) is disposed in the region of the edge, facing the film roll (10), of the respective horizontally upper suction frame of the basket (2).
6. Device according to claims 4 and 5, characterized in that by entraining (19) of the lifting frame (14) on the downward movement thereof the drive of the cutting means (12) takes place in the cutting direction.
7. Device according to claim 4, characterized in that the lifting frame (14) on meeting the upper suction frame controls the switching off of the partial vacuum influencing of said suction frame.
EP83107558A 1982-07-30 1983-08-01 Device for intermittently unwinding and cutting a film from a roll, particularly for a vacuum casting machine Expired EP0104365B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83107558T ATE23139T1 (en) 1982-07-30 1983-08-01 DEVICE FOR INTERMITTENT PULLING AND CUTTING-OFF OF FILM SECTION FROM A FILM ROLL, ESPECIALLY FOR A VACUUM CASTING MOLDING PLANT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3228582 1982-07-30
DE3228582 1982-07-30

Publications (3)

Publication Number Publication Date
EP0104365A2 EP0104365A2 (en) 1984-04-04
EP0104365A3 EP0104365A3 (en) 1985-05-15
EP0104365B1 true EP0104365B1 (en) 1986-10-29

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ID=6169770

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83107558A Expired EP0104365B1 (en) 1982-07-30 1983-08-01 Device for intermittently unwinding and cutting a film from a roll, particularly for a vacuum casting machine

Country Status (3)

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EP (1) EP0104365B1 (en)
AT (1) ATE23139T1 (en)
DE (1) DE3367198D1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2642344B1 (en) * 1989-01-06 1991-04-26 Dages Didier ARRANGEMENT OF DEVICES FOR THE AUTOMATIC PRODUCTION OF FLAT CASTING MOLDS USING BINDLESS DRY SAND
CN110744010A (en) * 2019-11-11 2020-02-04 青岛恒林工业集团股份有限公司 Novel vacuum adsorption film unfolding device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1454948A1 (en) * 1963-08-08 1969-04-30 Bahlsen Werner Process for the pneumatic deformation of thermoplastic synthetic films

Also Published As

Publication number Publication date
DE3367198D1 (en) 1986-12-04
EP0104365A2 (en) 1984-04-04
ATE23139T1 (en) 1986-11-15
EP0104365A3 (en) 1985-05-15

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