EP0907488A1 - Ejection device - Google Patents

Ejection device

Info

Publication number
EP0907488A1
EP0907488A1 EP97923707A EP97923707A EP0907488A1 EP 0907488 A1 EP0907488 A1 EP 0907488A1 EP 97923707 A EP97923707 A EP 97923707A EP 97923707 A EP97923707 A EP 97923707A EP 0907488 A1 EP0907488 A1 EP 0907488A1
Authority
EP
European Patent Office
Prior art keywords
piston
ejector
base plate
preform
ejector device
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.)
Ceased
Application number
EP97923707A
Other languages
German (de)
French (fr)
Inventor
Otto Hofstetter
Luis Fernandez
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.)
Otto Hofstetter AG
Original Assignee
Otto Hofstetter AG
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 Otto Hofstetter AG filed Critical Otto Hofstetter AG
Publication of EP0907488A1 publication Critical patent/EP0907488A1/en
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/7207—Heating or cooling of the moulded articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/42—Removing or ejecting moulded articles using means movable from outside the mould between mould parts, e.g. robots
    • B29C45/4225—Take-off members or carriers for the moulded articles, e.g. grippers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/42—Removing or ejecting moulded articles using means movable from outside the mould between mould parts, e.g. robots
    • B29C2045/4241—Auxiliary means for removing moulded articles from the robot
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/7207—Heating or cooling of the moulded articles
    • B29C2045/7214—Preform carriers for cooling preforms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/7207—Heating or cooling of the moulded articles
    • B29C2045/7214—Preform carriers for cooling preforms
    • B29C2045/7221—Means for ejecting the preforms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/7207—Heating or cooling of the moulded articles
    • B29C2045/7214—Preform carriers for cooling preforms
    • B29C2045/7235—Mechanical retaining means for preform ends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform

Definitions

  • the present invention relates to an ejection device for a removal device suitable for removing preforms according to the preamble of claim 1.
  • Machines for the production of preforms or preforms, in particular for the production of beverage bottles made of PET essentially comprise a plastic unit and a molding tool unit.
  • Removal devices for removing the preforms from the molding tool are being used ever more frequently in order to reduce the cycle times and in particular the downtimes of the plastic injection molding machines caused by the long cooling time of the preforms.
  • the molds after the injection process, respectively. opened prematurely during the cooling phase and the preforms which have not yet cooled completely are automatically picked up by these removal devices and cooled further. During this cooling time, the molds can be closed again and refilled.
  • Modern removal devices can usually hold three batches made in succession before they eject the first batch.
  • a removal device which comprises an ejector piston, the piston head of which can be displaced in a pressure-tight manner in the preform holder.
  • a pressure chamber is formed between the piston head and the bottom part of the preform holder and communicates with a compressed air duct system provided in the base plate of the removal device.
  • the ejector piston has a piston pin which is guided through a bore in the base part of the preform holder and in turn is mounted in a pressure-tight and movable manner in this bore. This piston pin protrudes into a second chamber (hereinafter also referred to as a vacuum chamber), which is provided in the base plate of the removal device
  • Vacuum channel system communicates. This second chamber communicates through a bore through the piston pin and piston head into the interior of the preform holder.
  • the removal plate is positioned in the desired manner in the open mold. Due to the suction created by the vacuum system, the individual preforms are drawn into the respective preform holder until it is on the piston face of the Apply piston head. By further vacuuming the second chamber, the entire ejector piston together with the preform is pulled further against the bottom of the preform holder and held there.
  • the vacuum can be regulated in a suitable manner.
  • the compressed air system is activated and a pressure is built up in the pressure chamber between the piston head and the bottom part of the preform holder, with which the displaceable piston head is moved outwards in order to eject the cooled preform from the preform holder.
  • a flange at the end of the piston pin determines the end position of the ejector piston.
  • This device ensures that the overpressure generated in the pressure chamber when the preforms are ejected does not drop independently of the acting adhesive forces and can be controlled in a simple manner.
  • the individual preforms are safely ejected with this device.
  • This device makes it possible for the first time to control and regulate the pull-in and ejector forces in a suitable manner.
  • the preform can also be actively cooled in the sprue area with the ejector device according to the invention.
  • this surface can be coated with a particularly suitable non-stick layer.
  • the pressure chamber moving the piston is configured in a ring shape and that the piston pin has a flange at its base plate end to limit the piston stroke.
  • the individual preform holders each have an outer tubular cylinder sleeve and an inner cup-shaped cylinder sleeve, this cylinder sleeve being provided on the bottom side with a base part which is inserted into a recess in the base plate can. This base part will secured against rotation by means of positioning pins on the base plate.
  • the cylinder sleeve of the preform holder has a base plate such that the base part of the cylinder liner can be held in the recess of the base plate with the aid of this base plate.
  • FIG. 1 shows a longitudinal section through a preform holder according to the invention in the plane of the compressed air system
  • FIG. 3 shows a cross section through the supply plate of the removal device according to the invention
  • Fig. 5 is a plan view of the only partially loaded removal plate.
  • FIG. 1 A large number of preform holders 1 are applied to a base plate 2.
  • a base plate 2 Here is a cup-shaped
  • Cylinder liner 3 with its base part inserted into a corresponding recess 4 in base plate 2 and positioned with the aid of a positioning pin 5 such that supply lines 6 of the compressed air supply system are connected to a compressed air duct 7 provided in cylinder liner 3.
  • a tubular cylinder sleeve 8 Around the cup-shaped cylinder liner 3 there is a tubular cylinder sleeve 8, which has a base plate 9, which is fastened by means of screws 10 to the base plate 2.
  • the base part 33 of the cylinder liner 3 is held in the recesses 4 of the base plate 2.
  • Recesses 11 are provided between cylinder sleeve 3 and cylinder sleeve 8, in which a coolant can circulate.
  • the shape of the inner wall 12 of the cylinder liner 3 corresponds to the design of the outer surface of the preforms to be produced and can be coated and tapered for easier removal.
  • the ejector device comprises an ejector piston 13 which is formed from a piston head 14 and a piston pin 15.
  • the piston head 14 runs in a pressure-tight manner in a cylindrical bottom space 16 of the cup-shaped cylinder liner 3. Between this piston head 14 and the bottom surface 17 of the bottom space 16, a pressure chamber 18 is formed, which communicates with the compressed air channel 7. It is understood that the piston end face 19 follows the shape of the preform to be produced.
  • the piston pin 15 provided on the piston head 14 also runs in a pressure-tight manner in a piston pin opening 20 of the base part 21 of the cup-shaped cylinder liner 3 and projects into a vacuum chamber 22 which is connected to a vacuum system (not shown).
  • a central bore in the ejector piston 13 creates the connection between the vacuum system and the interior of the preform holder and thereby allows the preforms to be drawn in with the aid of the vacuum system.
  • the pressure chamber 18 is pressurized via the compressed air channel 7 and the ejector piston 13 is thereby moved in the direction of the opening of the preform holder.
  • the pressure-tight guidance of the piston head 14 and piston pin 15 prevents compressed air from escaping during this ejection movement.
  • a flange 23 in the form of a ring attached to the piston pin 15 in the vacuum chamber 22 defines the maximum stroke of the ejector piston 13.
  • Supply plate 27 for supplying the negative and positive pressure systems and the cooling system.
  • This figure makes it clear that three batches can be cooled one after the other with the removal device, in which only every third preform holder 1 for receiving a preform 24 interacts or interacts with the vacuum system. only every third preform holder 1 interacts with the overpressure system for the ejection process.
  • a preferred embodiment of the removal device has twelve rows arranged one behind the other, as shown in FIG. 2, and is therefore suitable for the simultaneous removal of 48 preforms.
  • FIG. 3 shows the geometrical arrangement of the compressed air lines and their connection to the respective pressure chambers 18 of the preform holder 1.
  • the supply plate 27 leads to three independent channel systems, for the vacuum 29, for the overpressure 30 and for the cooling 31 This figure makes it clear that in each case three preform holders must be connected independently of one another to the corresponding supply lines in order to enable their independent control.
  • FIG. 4 shows two preform holders 1 which are arranged next to one another and whose ejector devices are in different working positions.
  • the section shown runs transversely to the cross section shown in FIG. 1 and shows, in contrast, the connection of the coolant channels 31 to the recesses 11 provided for cooling the cylinder liner 3, and a connection 25 between the vacuum channel 29 and the vacuum chamber 22.
  • the piston head 14 of the ejector piston 13 lies on the bottom surface 17 of the bottom part 21 of the cup-shaped cylinder liner 3.
  • the associated piston pin 15 projects completely through the piston pin opening 20 into the vacuum chamber 22.
  • the pressure chamber 18 is designed as an annular chamber and is connected to the compressed air system (not shown).
  • the piston end face 19 conforms to the outer shape of the preform 24. Due to the flat guidance of the ejector piston 13, this transfers the heat absorbed by the preform 24 directly to the cooled cylinder liner 3 and thus actively supports the cooling of the hot preform 24 in the sprue area.
  • the ejector piston 13 is therefore preferably made of a material with high thermal conductivity. The vacuum generated in the vacuum chamber 22 is maintained during the cooling phase.
  • the vacuum in the vacuum chamber 22 is reduced and the pressure chamber 18 is pressurized. This pushes the ejector piston 13 against the opening of the preform holder 1.
  • the end position of the ejector piston 13 is preferably fixed by a flange 23.
  • FIG. 5 shows a top view of a removal plate which is only partially equipped with preform holders 1.
  • the arrangement and attachment of the foot plates 9 connected to the cylinder sleeves 8 can be seen from this.
  • the bore 26, which is connected to the interior of the cylinder liner 3 and the vacuum chamber 22, is arranged centrally in this exemplary embodiment.
  • the compressed air channel 7 ends in the periphery of the bottom surface 17 and is thus in connection with the annular pressure chamber 18 formed by the piston head.
  • the bores 32 for the supply and discharge of the coolant are centrally opposite one another. Perpendicular for this purpose, the recesses for the positioning pins 5 are provided.
  • the embodiment shown of the removal plate according to the invention has twelve rows of twelve preform holders 1 and is therefore suitable for removing preforms from a 48-cavity mold. More preferred
  • this ejector device can also be used with removal plates with more than 48 preform holders.
  • This device allows the preform holder to be arranged in any desired manner and is therefore suitable for molds of all kinds.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Robotics (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

The invention concerns an ejector for a discharging device for the removal of preforms which enables a partially cooled preform to be detached safely from a form tool and, on complete cooling, to be likewise removed from the discharging device safely and completely.

Description

AusstosservorrichtungEjector device
Die vorliegende Erfindung betrifft eine Ausstosservorrich¬ tung für eine zur Entnahme von Preforms geeignete Entnah¬ mevorrichtung nach dem Oberbegriff des Anspruchs 1.The present invention relates to an ejection device for a removal device suitable for removing preforms according to the preamble of claim 1.
Maschinen zur Herstellung von Preforms oder Vorformlingen, insbesondere für die Herstellung von Getränkeflaschen aus PET, umfassen im wesentlichen eine Kunststoff-Einheit und eine Formwerkzeugeinheit. Dabei werden Entnahmevorrich- tungen zur Entnahme der Preforms aus dem Formwerkzeug immer häufiger eingesetzt, um die Zykluszeiten und insbesondere die wegen der langen Kühlzeit der Preforms verursachten Standzeiten der Kunststoffspritzmaschinen zu reduzieren. Dazu werden die Formwerkzeuge nach dem Einspritzvorgang, resp. während der Kühlphase vorzeitig geöffnet und werden die noch nicht vollständig abgekühlten Vorformlinge von diesen Entnahmevorrichtungen automatisch aufgenommen und weiter gekühlt. Während dieser Kühlzeit können die Form¬ werkzeuge wieder geschlossen und neu gefüllt werden. Moderne Entnahmevorrichtungen können in der Regel drei hintereinander hergestellte Chargen aufnehmen, bevor sie die erste Charge ausstossen.Machines for the production of preforms or preforms, in particular for the production of beverage bottles made of PET, essentially comprise a plastic unit and a molding tool unit. Removal devices for removing the preforms from the molding tool are being used ever more frequently in order to reduce the cycle times and in particular the downtimes of the plastic injection molding machines caused by the long cooling time of the preforms. For this purpose, the molds after the injection process, respectively. opened prematurely during the cooling phase and the preforms which have not yet cooled completely are automatically picked up by these removal devices and cooled further. During this cooling time, the molds can be closed again and refilled. Modern removal devices can usually hold three batches made in succession before they eject the first batch.
Für das Ausstossen der gekühlten Preforms sind auf diesem Gebiet verschiedene Vorrichtungen bekannt. Eine der ge¬ bräuchlichsten Ausstossvorrichtungen weist im Innern der kühlbaren Entnahmehülsen einen Kolben auf, der mit Druck¬ luft nach aussen gestossen werden kann. Ein im Boden der Entnahmehülse fixierter Bolzen hält diesen Kolben in seiner Endstellung zurück, während die Druckluft weiter durch eine Bohrung im Kolben den Vorformling aus der Hülse heraus¬ treiben kann. Diese Bohrung durch den Kolben wird gleich¬ zeitig dazu benutzt, um die Luft in den Entnahmehülsen über das zum Ausstossen vorgesehene Druckluftleitungssystem wegzupumpen, d.h. in den Entnahmehülsen einen Unterdruck, resp. eine Saugwirkung zu erzeugen, mit welcher die Pre¬ forms in die Entnahmehülsen eingezogen werden können. Leider zeigt es sich, dass sich die beim Abkühlen schrumpfenden resp. schwindenden Preforms nicht gleichmäs- sig von der Wandung der Entnahmehülse ablösen und daran zum Teil unerwartet fest haften bleiben. Bei den bekannten Ausstosservorrichtungen führt dies dazu, dass die gekühlten Preforms nicht mit Sicherheit ausgeworfen werden, da die für das Ausstossen vorgesehene Druckluft bei den Entnah¬ mehülsen mit leicht entfernbaren oder bereits ausgestos- senen Preforms entweicht.Various devices are known in this field for ejecting the cooled preforms. One of the most common ejection devices has a piston inside the coolable removal sleeves, which can be pushed outwards with compressed air. A bolt fixed in the bottom of the removal sleeve holds this piston in its end position, while the compressed air can further drive the preform out of the sleeve through a bore in the piston. This bore through the piston is used at the same time to pump away the air in the removal sleeves via the compressed air line system provided for ejection, ie a negative pressure or, respectively, in the removal sleeves. to generate a suction effect with which the preforms can be drawn into the removal sleeves. Unfortunately, it turns out that the cool down shrinking resp. Do not evenly remove shrinking preforms from the wall of the removal sleeve and sometimes stick to them unexpectedly. In the known ejection devices, this means that the cooled preforms are not ejected with certainty, since the compressed air provided for the ejection escapes with easily removable or already ejected preforms in the removal sleeves.
Es ist deshalb Aufgabe der vorliegenden Erfindung, eine Entnahmevorrichtung mit einer Ausstosservorrichtung zu schaffen, mit welcher die angekühlten Preforms sicher aus dem Formwerkzeug entnommen und nach deren Auskühlung ebenso sicher und vollständig wieder aus der Entnahmevorrichtung ausgestossen werden können.It is therefore an object of the present invention to provide a removal device with an ejector device with which the cooled preforms can be safely removed from the molding tool and, after they have cooled, can be ejected from the removal device just as safely and completely.
Erfindungsgemäss wird dies mit einer Entnahmevorrichtung gemäss Anspruch 1 erreicht, und insbesondere mit einer Ausstosservorrichtung, welche einen Ausstosserkolben um- fasst, dessen Kolbenkopf in der Preform-Halterung druck¬ dicht verschiebbar ist. Zwischen Kolbenkopf und Bodenteil der Preform-Halterung ist eine Druckkammer ausgebildet, die mit einem in der Grundplatte der Entnahmevorrichtung vor¬ gesehenen Druckluftkanalsystem kommuniziert. Zusätzlich weist der Ausstosserkolben einen Kolbenstift auf, der durch eine Bohrung im Bodenteil der Preform-Halterung geführt ist und in dieser Bohrung wiederum druckdicht und bewegbar gelagert ist. Dieser Kolbenstift ragt in eine zweite Kammer (im folgenden auch Unterdruckkammer genannt) , die mit einem in der Grundplatte der Entnahmevorrichtung vorgesehenenThis is achieved according to the invention with a removal device according to claim 1, and in particular with an ejector device which comprises an ejector piston, the piston head of which can be displaced in a pressure-tight manner in the preform holder. A pressure chamber is formed between the piston head and the bottom part of the preform holder and communicates with a compressed air duct system provided in the base plate of the removal device. In addition, the ejector piston has a piston pin which is guided through a bore in the base part of the preform holder and in turn is mounted in a pressure-tight and movable manner in this bore. This piston pin protrudes into a second chamber (hereinafter also referred to as a vacuum chamber), which is provided in the base plate of the removal device
Unterdruckkanalsystem kommuniziert. Diese zweite Kammer kommuniziert über eine durch Kolbenstift und Kolbenkopf führende Bohrung in den Innenraum der Preform-Halterung.Vacuum channel system communicates. This second chamber communicates through a bore through the piston pin and piston head into the interior of the preform holder.
Zur Aufnahme von Preforms wird die Entnahmeplatte im geöf¬ fneten Formwerkzeug in gewünschter Weise positioniert. Durch die mit dem Unterdrucksystem erzeugte Saugwirkung werden die einzelnen Preforms in die jeweiligen Preform- Halter eingezogen, bis diese an der Kolbenstirnfläche des Kolbenkopfes anliegen. Durch die weitere Vakuumierung der zweiten Kammer wird der gesamte Ausstosserkolben zusammen mit der Preform weiter gegen den Boden der Preform-Hal¬ terung gezogen und dort gehalten. Dabei kann der Unterdruck in geeigneter Weise geregelt werden. Nach erfolgter Kühlung wird das Druckluftsystem aktiviert und in der Druckkammer zwischen Kolbenkopf und Bodenteil der Preform-Halterung ein Druck aufgebaut, mit welchem der verschiebbare Kolbenkopf nach aussen bewegt wird, um die gekühlte Preform aus der Preform-Halterung auszustossen. Ein Flansch am Ende des Kolbenstifts bestimmt die Endlage des Ausstosserkolbens.In order to hold preforms, the removal plate is positioned in the desired manner in the open mold. Due to the suction created by the vacuum system, the individual preforms are drawn into the respective preform holder until it is on the piston face of the Apply piston head. By further vacuuming the second chamber, the entire ejector piston together with the preform is pulled further against the bottom of the preform holder and held there. The vacuum can be regulated in a suitable manner. After cooling, the compressed air system is activated and a pressure is built up in the pressure chamber between the piston head and the bottom part of the preform holder, with which the displaceable piston head is moved outwards in order to eject the cooled preform from the preform holder. A flange at the end of the piston pin determines the end position of the ejector piston.
Diese Vorrichtung gewährleistet, dass der in der Druckkam¬ mer erzeugte Überdruck beim Ausstossen der Preforms unab- hängig von den wirkenden Haftkräften nicht abfällt und in einfacher Weise kontrollierbar ist. Die einzelnen Preforms werden mit dieser Vorrichtung sicher ausgestossen. Diese Vorrichtung erlaubt es, erstmals die Einzugs- und Aus- stosser-Kräfte in geeigneter Weise zu kontrollieren und zu regulieren. Darüberhinauε kann mit der erfindungsgemässen Ausstosservorrichtung die Preform auch im Angussbereich aktiv gekühlt werden.This device ensures that the overpressure generated in the pressure chamber when the preforms are ejected does not drop independently of the acting adhesive forces and can be controlled in a simple manner. The individual preforms are safely ejected with this device. This device makes it possible for the first time to control and regulate the pull-in and ejector forces in a suitable manner. In addition, the preform can also be actively cooled in the sprue area with the ejector device according to the invention.
In weiteren Ausführungsformen wird darauf geachtet, dass sich die Kolbenstirnfläche an die Aussenform der Preform anschmiegt. Hilfsweise kann diese Fläche mit einer beson¬ ders geeigneten Antihaftschicht beschichtet sein. Als besonders vorteilhaft erweist sich, dass die den Kolben bewegende Druckkammer ringförmig ausgestaltet ist und der Kolbenstift zur Begrenzung des Kolbenhubs an seinem grund- plattenseitigen Ende einen Flansch aufweist. Zur Ermögli¬ chung einer einfachen Montage und Demontage der einzelnen Preform-Halter weisen diese jeweils eine äussere rohrförmi- ge Zylinderhülse und eine innere becherförmige Zylinder- büchse auf, wobei diese Zylinderbüchse bodenseitig mit einem Sockelteil versehen ist, der in eine Ausnehmung der Grundplatte eingesetzt werden kann. Dieser Sockelteil wird mittels Positionierstiften auf der Grundplatte gegen Ver¬ drehen gesichert. Die Zylinderhülse des Preformhalters weist eine Fussplatte auf derart, dass der Sockelteil der Zylinderbüchse mit Hilfe dieser Fussplatte in der Ausneh¬ mung der Grundplatte festgehalten werden kann.In further embodiments, care is taken to ensure that the piston end surface conforms to the outer shape of the preform. In the alternative, this surface can be coated with a particularly suitable non-stick layer. It has proven to be particularly advantageous that the pressure chamber moving the piston is configured in a ring shape and that the piston pin has a flange at its base plate end to limit the piston stroke. To enable simple assembly and disassembly of the individual preform holders, they each have an outer tubular cylinder sleeve and an inner cup-shaped cylinder sleeve, this cylinder sleeve being provided on the bottom side with a base part which is inserted into a recess in the base plate can. This base part will secured against rotation by means of positioning pins on the base plate. The cylinder sleeve of the preform holder has a base plate such that the base part of the cylinder liner can be held in the recess of the base plate with the aid of this base plate.
Im folgenden soll die vorliegende Erfindung anhand eines Ausführungsbeispiels und mit Hilfe der Figuren näher er¬ läutert werden. Dabei zeigt:The present invention is to be explained in more detail below using an exemplary embodiment and with the aid of the figures. It shows:
Fig. 1 einen Längsschnitt durch eine erfindungsgemässe Preform-Halterung in der Ebene des Druckluftsys¬ tems;1 shows a longitudinal section through a preform holder according to the invention in the plane of the compressed air system;
Fig. 2 einen Querschnitt durch die erfindungsgemässe Ent¬ nahmevorrichtung;2 shows a cross section through the removal device according to the invention;
Fig. 3 einen Querschnitt durch die Versorgungsplatte der erfindungsgemässen Entnahmevorrichtung;3 shows a cross section through the supply plate of the removal device according to the invention;
Fig. 4 einen Längsschnitt durch die Preform-Halterung in der Ebene des Kühlsystems;4 shows a longitudinal section through the preform holder in the plane of the cooling system;
Fig. 5 eine Aufsicht auf die nur teilweise bestückte Entnahmeplatte.Fig. 5 is a plan view of the only partially loaded removal plate.
Der Aufbau der erfindungsgemäsε gestalteten Preform-Hal¬ terung und Ausstosservorrichtung ist aus Figur 1 ersicht¬ lich. Eine Vielzahl Preform-Halter 1 sind auf einer Grund- platte 2 aufgebracht. Dabei ist eine becherförmigeThe structure of the preform holder and ejector device designed according to the invention can be seen from FIG. A large number of preform holders 1 are applied to a base plate 2. Here is a cup-shaped
Zylinderbüchse 3 mit ihrem Sockelteil in eine entsprechende Ausnehmung 4 in der Grundplatte 2 eingelassen und mit Hilfe eines Positionierstiftes 5 so positioniert, dass die Zu¬ fuhrleitungen 6 des Druckluftversorgungssystems mit einem in der Zylinderbüchse 3 vorgesehenen Druckluftkanal 7 in Verbindung steht. Um die becherförmige Zylinderbüchse 3 liegt eine rohrförmige Zylinderhülse 8, welche eine Fuss- platte 9 aufweist, die mit Hilfe von Schrauben 10 an der Grundplatte 2 befestigt ist. Dadurch wird der Sockelteil 33 der Zylinderbüchse 3 in den Ausnehmungen 4 der Grundplatte 2 festgehalten. Zwischen Zylinderbüchse 3 und Zylinderhülse 8 sind Ausnehmungen 11 vorgesehen, in welchen ein Kühlmit¬ tel zirkulieren kann. Es versteht sich, dass die Form der Innenwandung 12 der Zylinderbüchse 3 der Gestaltung der Aussenfläche der herzustellenden Preforms entspricht und für die leichtere Entnahme beschichtet sein kann und konisch verläuft. Die Ausstosservorrichtung umfasst einen Ausstosserkolben 13 der aus einem Kolbenkopf 14 und einem Kolbenstift 15 gebildet ist. Der Kolbenkopf 14 läuft druck¬ dicht in einem zylindrischen Bodenraum 16 der becher¬ förmigen Zylinderbüchse 3. Zwischen diesem Kolbenkopf 14 und der Bodenfläche 17 des Bodenraums 16 ist eine Druckkam¬ mer 18 ausgebildet, welche mit dem Druckluftkanal 7 kom¬ muniziert. Es versteht sich, dass die Kolbenstirnfläche 19 der Form der herzustellenden Preform folgt. Der am Kol¬ benkopf 14 vorgesehene Kolbenstift 15 läuft ebenfalls druckdicht in einer Kolbenstiftöffnung 20 des Bodenteils 21 der becherförmigen Zylinderbüchse 3 und ragt in eine Unter¬ druckkammer 22, welche mit einem Vakuumierungssystem (nicht dargestellt) verbunden ist. Eine zentrale Bohrung im Aus¬ stosserkolben 13 schafft die Verbindung zwischen Vakuumierungssystem und Innenraum der Preform-Halterung und erlaubt dadurch das Einziehen der Preforms mit Hilfe des Vakuumierungssystems.Cylinder liner 3 with its base part inserted into a corresponding recess 4 in base plate 2 and positioned with the aid of a positioning pin 5 such that supply lines 6 of the compressed air supply system are connected to a compressed air duct 7 provided in cylinder liner 3. Around the cup-shaped cylinder liner 3 there is a tubular cylinder sleeve 8, which has a base plate 9, which is fastened by means of screws 10 to the base plate 2. As a result, the base part 33 of the cylinder liner 3 is held in the recesses 4 of the base plate 2. Recesses 11 are provided between cylinder sleeve 3 and cylinder sleeve 8, in which a coolant can circulate. It is understood that the shape of the inner wall 12 of the cylinder liner 3 corresponds to the design of the outer surface of the preforms to be produced and can be coated and tapered for easier removal. The ejector device comprises an ejector piston 13 which is formed from a piston head 14 and a piston pin 15. The piston head 14 runs in a pressure-tight manner in a cylindrical bottom space 16 of the cup-shaped cylinder liner 3. Between this piston head 14 and the bottom surface 17 of the bottom space 16, a pressure chamber 18 is formed, which communicates with the compressed air channel 7. It is understood that the piston end face 19 follows the shape of the preform to be produced. The piston pin 15 provided on the piston head 14 also runs in a pressure-tight manner in a piston pin opening 20 of the base part 21 of the cup-shaped cylinder liner 3 and projects into a vacuum chamber 22 which is connected to a vacuum system (not shown). A central bore in the ejector piston 13 creates the connection between the vacuum system and the interior of the preform holder and thereby allows the preforms to be drawn in with the aid of the vacuum system.
Für den Ausstossvorgang wird die Druckkammer 18 über den Druckluftkanal 7 unter Druck gesetzt und der Ausstosserkol¬ ben 13 dadurch in Richtung zur Öffnung der Preform-Hal¬ terung bewegt. Die druckdichte Führung des Kolbenkopfes 14 und Kolbenstiftes 15 verhindert, dass bei dieser Ausstoss- bewegung Druckluft entweichen kann. Ein in der Unterdruck- kammer 22 am Kolbenstift 15 befestigter Flansch 23 in Form eines aufgesetzten Ringes, definiert den maximalen Hub des Ausstosserkolbens 13. Die in Figur 2 im Querschnitt dargestellte Entnahmevorrich¬ tung wird zwischen Matrizenplatte 28 und Patrizenplatte (nicht dargestellt) des geöffneten Formwerkzeugs geschoben und weist im wesentlichen eine Grundplatte 2 auf, mit einer Vielzahl daran befestigter Preform-Halter 1 und einerFor the ejection process, the pressure chamber 18 is pressurized via the compressed air channel 7 and the ejector piston 13 is thereby moved in the direction of the opening of the preform holder. The pressure-tight guidance of the piston head 14 and piston pin 15 prevents compressed air from escaping during this ejection movement. A flange 23 in the form of a ring attached to the piston pin 15 in the vacuum chamber 22 defines the maximum stroke of the ejector piston 13. The removal device shown in cross section in FIG. 2 is pushed between the die plate 28 and the die plate (not shown) of the opened mold and essentially has a base plate 2 with a plurality of preform holders 1 and one attached thereto
Versorgungsplatte 27 zur Versorgung der Unter- und Über¬ drucksysteme und des Kühlsystems. Diese Figur macht deut¬ lich, dass mit der Entnahmevorrichtung drei Chargen hinter¬ einander ausgekühlt werden können, in dem jeweils nur jeder dritte Preform-Halter 1 für die Aufnahme einer Preform 24 mit dem Vakuumierungssystem wechselwirkt resp. nur jeder dritte Preform-Halter 1 für den Ausstossvorgang mit dem Überdrucksystem wechselwirkt. Eine bevorzugte Ausführungs¬ form der Entnahmevorrichtung weist zwölf hintereinander angeordnete Reihen, wie sie in Figur 2 dargestellt sind, auf, und eignet sich damit für die gleichzeitige Entnahme von 48 Preforms.Supply plate 27 for supplying the negative and positive pressure systems and the cooling system. This figure makes it clear that three batches can be cooled one after the other with the removal device, in which only every third preform holder 1 for receiving a preform 24 interacts or interacts with the vacuum system. only every third preform holder 1 interacts with the overpressure system for the ejection process. A preferred embodiment of the removal device has twelve rows arranged one behind the other, as shown in FIG. 2, and is therefore suitable for the simultaneous removal of 48 preforms.
Figur 3 zeigt die geometrische Anordnung der Druckluft- leitungen und deren Verbindung mit den jeweiligen Druckkam¬ mern 18 der Preform-Halter 1. Die Versorgungsplatte 27 führt dazu drei voneinander unabhängige Kanalsysteme, für die Vakuumierung 29, für den Überdruck 30 und für die Kühlung 31. Diese Figur macht deutlich, dass jeweils drei Preform-Halter unabhängig voneinander mit den entsprechen¬ den Versorgungsleitungen in Verbindung stehen müssen, um deren voneinander unabhängige Steuerung zu ermöglichen.FIG. 3 shows the geometrical arrangement of the compressed air lines and their connection to the respective pressure chambers 18 of the preform holder 1. The supply plate 27 leads to three independent channel systems, for the vacuum 29, for the overpressure 30 and for the cooling 31 This figure makes it clear that in each case three preform holders must be connected independently of one another to the corresponding supply lines in order to enable their independent control.
Figur 4 zeigt zwei nebeneinander angeordnete Preform-Halter 1 deren Ausstosservorrichtungen in verschiedenen Arbeits¬ stellungen stehen. Der gezeigte Schnitt läuft quer zu dem in Figur 1 dargestellten Querschnitt und zeigt im Unter¬ schied dazu die Verbindung der Kühlmittelkanäle 31 mit den zur Kühlung der Zylinderbüchse 3 vorgesehenen Ausnehmungen 11, sowie eine Verbindung 25 zwischen dem Vakuumierungs- kanal 29 und der Unterdruckkammer 22. Bei eingesaugter Preform liegt der Kolbenkopf 14 des Ausstosserkolbens 13 auf der Bodenfläche 17 des Bodenteils 21 der becherförmigen Zylinderbüchse 3. Der dazugehörige Kolbenstift 15 ragt dabei vollständig durch die Kolbenstiftöffnung 20 in die Unterdruckkammer 22. Die Druckkammer 18 ist als ringförmige Kammer ausgebildet und mit dem Druckluftsystem (nicht dargestellt) verbunden. Die Kolbenstirnfläche 19 schmiegt sich an die Aussenform der Preform 24 an. Durch die flächige Führung des Ausstosserkolbens 13 überträgt dieser die von der Preform 24 aufgenommene Wärme unmittelbar an die gekühlte Zylinderbüchse 3 und unterstützt damit aktiv die Kühlung der heissen Preform 24 im Angussbereich. Vor¬ zugsweise ist der Ausstosserkolben 13 deshalb aus einem Material mit hoher Wärmeleitfähigkeit gefertigt. Während der Kühlphase wird der in der Unterdruckkammer 22 erzeugte Unterdruck aufrechterhalten.FIG. 4 shows two preform holders 1 which are arranged next to one another and whose ejector devices are in different working positions. The section shown runs transversely to the cross section shown in FIG. 1 and shows, in contrast, the connection of the coolant channels 31 to the recesses 11 provided for cooling the cylinder liner 3, and a connection 25 between the vacuum channel 29 and the vacuum chamber 22. When the preform is sucked in, the piston head 14 of the ejector piston 13 lies on the bottom surface 17 of the bottom part 21 of the cup-shaped cylinder liner 3. The associated piston pin 15 projects completely through the piston pin opening 20 into the vacuum chamber 22. The pressure chamber 18 is designed as an annular chamber and is connected to the compressed air system (not shown). The piston end face 19 conforms to the outer shape of the preform 24. Due to the flat guidance of the ejector piston 13, this transfers the heat absorbed by the preform 24 directly to the cooled cylinder liner 3 and thus actively supports the cooling of the hot preform 24 in the sprue area. The ejector piston 13 is therefore preferably made of a material with high thermal conductivity. The vacuum generated in the vacuum chamber 22 is maintained during the cooling phase.
Nach Ablauf der erforderlichen Kühlzeit wird der Unterdruck in der Unterdruckkammer 22 reduziert und die Druckkammer 18 unter Druck gesetzt. Damit wird der Ausstosserkolben 13 gegen die Öffnung des Preform-Halters 1 gestossen. Die Endstellung des Ausstosserkolbens 13 wird vorzugsweise durch einen Flansch 23 festgelegt. Nach dem Auswerfen der Preform 24 steht der Preform-Halter 1 für die Aufnahme einer nächsten Preform 24 bereit und braucht lediglich das Vakuumierungssystem wieder aktiviert zu werden.After the required cooling time, the vacuum in the vacuum chamber 22 is reduced and the pressure chamber 18 is pressurized. This pushes the ejector piston 13 against the opening of the preform holder 1. The end position of the ejector piston 13 is preferably fixed by a flange 23. After the preform 24 has been ejected, the preform holder 1 is ready to receive a next preform 24 and only needs to be reactivated.
Figur 5 zeigt eine Aufsicht auf eine nur teilweise mit Preform-Haltern 1 bestückte Entnahmeplatte. Die Anordnung und Befestigung der mit den Zylinderhülsen 8 verbundenen Fuεsplatten 9 ist daraus ersichtlich. Die mit dem Innenraum der Zylinderbüchse 3 und der Unterdruckkammer 22 in Verbin¬ dung stehende Bohrung 26 ist in diesem Ausführungsbeispiel zentral angeordnet. Der Druckluftkanal 7 endet in der Peripherie der Bodenfläche 17 und steht damit in Verbindung mit der durch den Kolbenkopf gebildeten ringförmigen Druck¬ kammer 18. Die Bohrungen 32 für die Zu- und Abführung des Kühlmittels stehen einander zentral gegenüber. Senkrecht dazu sind die Ausnehmungen für die Positionierstifte 5 vorgesehen. Die gezeigte Ausführungsform der erfindungs¬ gemässen Entnahmeplatte weist zwölf Reihen ä zwölf Preform- Haltern 1 auf und eignet sich damit für die Entnahme von Preforms aus einem 48-fach Werkzeug. Weitere bevorzugteFIG. 5 shows a top view of a removal plate which is only partially equipped with preform holders 1. The arrangement and attachment of the foot plates 9 connected to the cylinder sleeves 8 can be seen from this. The bore 26, which is connected to the interior of the cylinder liner 3 and the vacuum chamber 22, is arranged centrally in this exemplary embodiment. The compressed air channel 7 ends in the periphery of the bottom surface 17 and is thus in connection with the annular pressure chamber 18 formed by the piston head. The bores 32 for the supply and discharge of the coolant are centrally opposite one another. Perpendicular for this purpose, the recesses for the positioning pins 5 are provided. The embodiment shown of the removal plate according to the invention has twelve rows of twelve preform holders 1 and is therefore suitable for removing preforms from a 48-cavity mold. More preferred
Merkmale der erfindungsgemässen Ausstosservorrichtung sind in den Unteransprüchen aufgeführt.Features of the ejector device according to the invention are listed in the subclaims.
Es versteht sich, dass diese Ausstosservorrichtung auch bei Entnahmeplatten mit mehr als 48 Preform-Haltern verwendet werden kann. Diese Vorrichtung erlaubt es, die Preform- Halter in jeder gewünschten Weise anzuordnen und ist damit für Formwerkzeuge jeder Art geeignet. It goes without saying that this ejector device can also be used with removal plates with more than 48 preform holders. This device allows the preform holder to be arranged in any desired manner and is therefore suitable for molds of all kinds.

Claims

Ansprüche Expectations
1. Ausstosservorrichtung für ein Entnahmewerkzeug zur Entnahme von Preforms (24) aus einem Formwerkzeug, welches Entnahmewerkzeug mindestens eine Grundplatte (2) , eine Vielzahl an dieser Grundplatte befestigter Preform-Halter (1) und eine Ansaugvorrichtung (29) zum Ansaugen der Preforms (24) aufweist, und welche Aus¬ stosservorrichtung je einen innerhalb jedes Preform- Halters (1) angeordneten Ausstosserkolben (13) umfasst, der mit Hilfe einer Druckluftvorrichtung betätigbar ist, dadurch gekennzeichnet, dass der Ausstosserkolben (13) einen Kolbenkopf (14) auf¬ weist, der im Bodenbereich des Preform-Halters (1) druckdicht verschiebbar ist, wobei zum Ausstossen des1. ejector device for a removal tool for removing preforms (24) from a molding tool, which removal tool has at least one base plate (2), a plurality of preform holders (1) attached to this base plate and a suction device (29) for suctioning the preforms (24 ), and which ejector device comprises an ejector piston (13) arranged inside each preform holder (1), which can be actuated with the aid of a compressed air device, characterized in that the ejector piston (13) has a piston head (14) , which can be moved in a pressure-tight manner in the bottom area of the preform holder (1)
Ausstosserkolbens (13) zwischen dem Kolbenkopf (14) und einem Bodenteil (21) des Preform-Halters (1) eine Druckkammer (18) vorgesehen ist, die über einen Druck- luftkanal (7) mit der Druckluftvorrichtung kom- muniziert, und welcher Kolbenkopf (14) grundplattenseitig einen Kolbenstift (15) aufweist, der druckdicht durch den Bodenteil (21) geführt ist und in eine Unterdruckkammer (22) ragt, die einerseits mit einem Vakuumierungskanal (25) der Ansaugvorrichtung (29) kommuniziert und andererseits über eine durch den Ausstosserkolben (13) führende Öffnung (26) mit dem Innenraum des Preform- Halters (1) in Verbindung steht.Ejector piston (13) between the piston head (14) and a bottom part (21) of the preform holder (1) is provided a pressure chamber (18) which communicates with the compressed air device via a compressed air channel (7), and which piston head (14) has a piston pin (15) on the base plate side, which is guided pressure-tight through the base part (21) and protrudes into a vacuum chamber (22), which communicates on the one hand with a vacuum channel (25) of the suction device (29) and on the other hand via a through the Ejector piston (13) leading opening (26) communicates with the interior of the preform holder (1).
2. Ausstosservorrichtung nach Anspruch 1, dadurch geken¬ nzeichnet, dass der Kolbenkopf (14) preformseitig eine Kolbenstirnfläche (19) aufweist, die sich flächig an die Kontur der herzustellenden Preform (24) schmiegt.2. ejector device according to claim 1, characterized geken¬ characterized in that the piston head (14) on the preform side has a piston end face (19) which flatly conforms to the contour of the preform (24) to be produced.
3. Ausstosservorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Druckkammer (18) ringförmig ausgestaltet ist und durch eine bodenseitige Ausnehmung des Kolbenkopfes (14) gebildet wird.3. ejector device according to one of claims 1 or 2, characterized in that the pressure chamber (18) is annular and is formed by a bottom recess in the piston head (14).
4. Ausstosservorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Ausstosserkolben (13) aus einem wärmeleitfähigen Material gefertigt ist.4. ejector device according to one of claims 1 to 3, characterized in that the ejector piston (13) is made of a thermally conductive material.
5. Ausstosservorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Kolbenstift (15) zur Begrenzung des Kolbenhubs an seinem grundplatten- seitigen Ende einen Flansch (23) aufweist.5. ejector device according to one of claims 1 to 4, characterized in that the piston pin (15) to limit the piston stroke at its base plate-side end has a flange (23).
6. Ausstosservorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Preform-Halter (1) jeweils eine äussere rohrförmige Zylinderhülεe (8) und eine innere becherförmige Zylinderbüchse (3) aufweisen, wobei die Zylinderbüchsen (3) bodenseitig einen Sock¬ elteil (33) aufweisen, der jeweils in eine Ausnehmung (4) der Grundplatte (2) eingesetzt ist.6. ejector device according to one of claims 1 to 5, characterized in that the preform holder (1) each have an outer tubular cylinder sleeve (8) and an inner cup-shaped cylinder liner (3), the cylinder liners (3) having a base on the base Have elteil (33) which is inserted into a recess (4) of the base plate (2).
7. Ausstosservorrichtung nach Anspruch 6, dadurch geken¬ nzeichnet, dass der Sockelteil (33) mittels Posi- tionierεtifte (5) auf der Grundplatte (2) verdrehsicher positioniert ist.7. ejector device according to claim 6, characterized geken¬ characterized in that the base part (33) by means of positioning pins (5) is positioned against rotation on the base plate (2).
8. Ausstosservorrichtung nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, dasε die Zylinderhülεe (8) eine Fussplatte (9) aufweist.8. ejector device according to one of claims 6 or 7, characterized in that the cylinder sleeve (8) has a base plate (9).
9. Ausstosservorrichtung nach Anspruch 8, dadurch geken¬ nzeichnet, dass der Sockelteil (33) der Zylinderbüchse (3) mit Hilfe der Fusεplatte (9) in der Auεnehmung (4) der Grundplatte (2) festgehalten ist.9. ejector device according to claim 8, characterized geken¬ characterized in that the base part (33) of the cylinder liner (3) by means of the foot plate (9) is held in the recess (4) of the base plate (2).
10. Auεεtosserplatte nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Unterdruckkammer (22) durch miteinander fluchtende Ausnehmungen in der Grund- platte (2) und im Bodenteil (21) der Zylinderbuchse (3) gebildet ist. 10. Auεεtosserplatte according to any one of claims 1 to 9, characterized in that the vacuum chamber (22) through mutually aligned recesses in the base plate (2) and in the bottom part (21) of the cylinder liner (3) is formed.
EP97923707A 1996-06-11 1997-06-10 Ejection device Ceased EP0907488A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH145596 1996-06-11
CH1455/96 1996-06-11
PCT/CH1997/000231 WO1997047459A1 (en) 1996-06-11 1997-06-10 Ejection device

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Publication Number Publication Date
EP0907488A1 true EP0907488A1 (en) 1999-04-14

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US (1) US6190157B1 (en)
EP (1) EP0907488A1 (en)
JP (1) JP2000511837A (en)
CA (1) CA2257986A1 (en)
WO (1) WO1997047459A1 (en)

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WO1997047459A1 (en) 1997-12-18
US6190157B1 (en) 2001-02-20
CA2257986A1 (en) 1997-12-18

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