EP0467020B1 - Device for limiting the pressure of a tool with a punch and a die - Google Patents

Device for limiting the pressure of a tool with a punch and a die Download PDF

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Publication number
EP0467020B1
EP0467020B1 EP91106027A EP91106027A EP0467020B1 EP 0467020 B1 EP0467020 B1 EP 0467020B1 EP 91106027 A EP91106027 A EP 91106027A EP 91106027 A EP91106027 A EP 91106027A EP 0467020 B1 EP0467020 B1 EP 0467020B1
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EP
European Patent Office
Prior art keywords
accumulator
piston
chamber
pressure
tool
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91106027A
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German (de)
French (fr)
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EP0467020A1 (en
Inventor
Hans Dr. Wälchli
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Individual
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Individual
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Priority to AT91106027T priority Critical patent/ATE97372T1/en
Publication of EP0467020A1 publication Critical patent/EP0467020A1/en
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Publication of EP0467020B1 publication Critical patent/EP0467020B1/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/04—Applying separate sealing or securing members, e.g. clips

Definitions

  • the present invention relates to a pressure limiting device for a tool with a stamp and die.
  • So-called clips are used in devices for tying sausages, which are deformed by means of a stamp and a die so that the end of the sausage is closed.
  • the stamp and die of such a device are e.g. shown in DE-A-38 40 522.
  • US-A-3,913,628 shows a closing device, in particular for clips on food packaging. Due to the large number of sausages, different clips are used, which differ both in type and in size. This means that the punches and dies on the binding machines have to be changed, and the working stroke between the punches and dies often has to be changed as well. This leads to incorrect manipulation, which can lead to destruction of the binding machine, particularly when changing from a small to a larger working stroke.
  • the aim of the invention is to provide a device which does not have the disadvantage and with which the tool is protected.
  • the device shown in FIG. 1 is mounted in a tool holder 1 of a machine for tying sausages.
  • the device in question essentially consists of a cylindrical plunger 2 and a pressure accumulator 3.
  • the plunger 2 is mounted in a recess which is dimensioned such that a chamber 4 is present between the piston head and the bottom of the recess.
  • the plunger 2 is held in the recess by an end plate 12 and is provided with a sealing ring 6 which seals the chamber 4 to the outside.
  • the plunger 2 also has a cylindrical projection 7 which protrudes from the piston head and projects through a bore in the tool holder. At the free end of the approach has a threaded portion on which a ring nut 9 is screwed to adjust the volume of the chamber 4. In order to facilitate the setting, a pointer 9 is mounted on the extension 7. A scale 10 is engraved on the tool carrier 1 for adjustment.
  • the plunger 2 has a second cylindrical projection 11, which protrudes from the other end face and projects through the end plate 12, which holds the plunger 2 in the recess.
  • a stamp 13 is mounted on the second attachment 11.
  • the pressure accumulator 3 has a cylindrical housing, consisting of a lower part 15 which is open on one side and has a bore 16 in the other end wall (FIG. 2) and an end cap 17 which can be screwed onto the open end of the lower part 15.
  • a storage piston 18 is arranged axially displaceably in the housing, which divides the space in the housing into a liquid space 19 and a gas space 20.
  • a valve piston 21 is displaceably arranged in the liquid space 19 in order to open or close the opening 16 in the lower part 15.
  • a spring 22 is arranged in the liquid space 19 in order to press the valve piston 21 against the opening 16, while a further spring 23 is arranged in the gas space 20 in order to bias the storage piston 18 against the liquid space 19.
  • the pressure accumulator is also provided with a preliminary stroke valve 24.
  • the pressure accumulator 3 is mounted in a recess in the tool holder 1 so that the opening 16 in the lower part 15 is aligned with a bore 26 which opens into the chamber 4.
  • the opening 16 in the lower housing part 15 has a seat which cooperates with a first seat on a tubular extension 25 on the valve piston 21 in order to open or close the opening 16 on the pressure accumulator.
  • the extension 25 on the valve piston 21 also has a second seat, which interacts with the pre-stroke valve body 24.
  • the working stroke of the tool must be adapted to the clip height.
  • the following description of the function of the device now assumes that the adaptation has not been carried out and that the tool carries out a small working stroke, although a larger working stroke is required.
  • the punch and the die are pressed together before the end of the working stroke.
  • the pressure that occurs is transferred to the liquid present in the chamber 4, propagates through the bore 26, and acts on the valve piston 21 and the valve body 24 of the pre-stroke valve that bears against it.
  • a setpoint pressure value for the plunger can be obtained 2 can be determined. If the actual value in the chamber 4 exceeds this target value, the valve piston 21 is displaced and consequently the chamber 4 is relieved via the bore 26. As a result, the plunger 2 is displaced, whereby the working stroke of the tool is adjusted in the sense of an extension.
  • the machine can be switched off and an acoustic or visual signal can be emitted.
  • the pre-stroke valve is actuated.
  • the plunger 2 can be adjusted without pressure.
  • the liquid is then fed back through the pressure accumulator 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Press Drives And Press Lines (AREA)
  • Fluid-Damping Devices (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Forging (AREA)

Abstract

The device has a plunger piston (2) and a pressure accumulator (3) which are connected to one another. On the plunger piston (2) is fixed the punch (13) of a tool. The pressure accumulator (3) is a piston accumulator with a gas space (20) and a liquid space (19) which is in communication with the chamber (4) via a valve arrangement. Furthermore, a pre-stroke valve (24) is integrated into the pressure accumulator (3). This device can be used to limit the degree of pressure which can be applied to the plunger piston. As a result, a tool (23) is protected independently over its total circumference against excessive closing pressure. <IMAGE>

Description

Die vorliegende Erfindung betrifft eine Druckbegrenzungsvorrichtung für ein Werkzeug mit Stempel und Matrize.The present invention relates to a pressure limiting device for a tool with a stamp and die.

Bei Vorrichtungen zum Abbinden von Würsten werden sogenannte Clips verwendet, die mittels Stempel und Matrize so verformt werden, dass das Wurstende verschlossen ist. Stempel und Matrize einer solchen Vorrichtung sind z.B. in der DE-A-38 40 522 gezeigt. Die US-A-3,913,628 zeigt eine Verschliesseinrichtung insbesondere für Clips an Lebensmittelverpackungen. Bedingt durch die Vielzahl von Würsten werden unterschiedliche Clips verwendet, die sich sowohl in der Art und in der Grösse unterscheiden. Dadurch müssen an den Abbindemaschinen die Stempel und Matrize gewechselt werden, wobei oftmals auch der Arbeitshub zwischen Stempel und Matrize geändert werden muss. Hierbei kommt es zu Fehlmanipulationen, was insbesondere bei der Umstellung von kleinem auf grösseren Arbeitshub zur Zerstörung an der Abbindemaschine führen kann.So-called clips are used in devices for tying sausages, which are deformed by means of a stamp and a die so that the end of the sausage is closed. The stamp and die of such a device are e.g. shown in DE-A-38 40 522. US-A-3,913,628 shows a closing device, in particular for clips on food packaging. Due to the large number of sausages, different clips are used, which differ both in type and in size. This means that the punches and dies on the binding machines have to be changed, and the working stroke between the punches and dies often has to be changed as well. This leads to incorrect manipulation, which can lead to destruction of the binding machine, particularly when changing from a small to a larger working stroke.

Ziel der Erfindung ist eine Vorrichtung zu schaffen, welche den Nachteil nicht aufweist und mit der das Werkzeug geschont wird.The aim of the invention is to provide a device which does not have the disadvantage and with which the tool is protected.

Dieses Ziel wird erfindungsgemäss mit den kennzeichnenden Merkmalen des Anspruchs 1 erreicht. Der mit der Erfindung erzielbare Vorteil besteht darin, dass das Werkzeug vollumfänglich und selbständig gegen überhohen Schliessdruck gesichert ist.This aim is achieved according to the invention with the characterizing features of claim 1. The one with The advantage that can be achieved by the invention is that the tool is fully and independently secured against excessive closing pressure.

Vorteilhafte Ausführungsformen der Erfindung ergeben sich aus den abhängigen Ansprüchen.Advantageous embodiments of the invention result from the dependent claims.

Nachfolgend wird die Erfindung anhand der beiliegenden Zeichnungen erläutert.The invention is explained below with reference to the accompanying drawings.

Es zeigen:

  • Figur 1 einen Schnitt durch ein Ausführungsbeispiel einer erfindungsgemässen Vorrichtung, und
  • Figur 2 die Einzelheit "A" in Figur 1 im grösseren Massstab.
Show it:
  • 1 shows a section through an embodiment of a device according to the invention, and
  • Figure 2 shows the detail "A" in Figure 1 on a larger scale.

Die in Figur 1 gezeigte Vorrichtung ist in einem Werkzeughalter 1 einer Maschine zum Abbinden von Würsten montiert.The device shown in FIG. 1 is mounted in a tool holder 1 of a machine for tying sausages.

Die hier in Rede stehende Vorrichtung besteht im wesentlichen aus einem zylindrischen Tauchkolben 2 und einem Druckspeicher 3.The device in question essentially consists of a cylindrical plunger 2 and a pressure accumulator 3.

Der Tauchkolben 2 ist in einer Ausnehmung montiert, die so bemessen ist, dass zwischen dem Kolbenboden und dem Boden der Ausnehmung eine Kammer 4 vorhanden ist. Der Tauchkolben 2 ist durch eine Abschlussplatte 12 in der Ausnehmung gehalten und mit einem Dichtungsring 6 versehen, der die Kammer 4 nach aussen abdichtet.The plunger 2 is mounted in a recess which is dimensioned such that a chamber 4 is present between the piston head and the bottom of the recess. The plunger 2 is held in the recess by an end plate 12 and is provided with a sealing ring 6 which seals the chamber 4 to the outside.

Der Tauchkolben 2 hat ferner einen zylindrischen Ansatz 7, der vom Kolbenboden absteht und durch eine Bohrung im Werkzeughalter ragt. Am freien Ende hat der Ansatz einen Gewindeabschnitt, auf dem eine Ringmutter 9 geschraubt ist, um das Volumen der Kammer 4 einzustellen. Um die Einstellung zu erleichtern, ist am Ansatz 7 ein Zeiger 9 montiert. Zur Einstellung ist am Werkzeugträger 1 eine Skala 10 eingraviert.The plunger 2 also has a cylindrical projection 7 which protrudes from the piston head and projects through a bore in the tool holder. At the free end of the approach has a threaded portion on which a ring nut 9 is screwed to adjust the volume of the chamber 4. In order to facilitate the setting, a pointer 9 is mounted on the extension 7. A scale 10 is engraved on the tool carrier 1 for adjustment.

Der Tauchkolben 2 hat einen zweiten zylindrischen Ansatz 11, der von der anderen Stirnseite absteht und durch die Abschlussplatte 12 ragt, die den Tauchkolben 2 in der Ausnehmung hält. Am zweiten Ansatz 11 ist ein Stempel 13 montiert.The plunger 2 has a second cylindrical projection 11, which protrudes from the other end face and projects through the end plate 12, which holds the plunger 2 in the recess. A stamp 13 is mounted on the second attachment 11.

Der Druckspeicher 3 hat ein zylinderförmiges Gehäuse, bestehend aus einem Unterteil 15, der einseitig offen ist und in der anderen Stirnwand eine Bohrung 16 hat (Figur 2) und einer Abschlusskappe 17, die am offenen Ende des Unterteils 15 aufschraubbar ist. Im Gehäuse ist ein Speicherkolben 18 axial verschiebbar angeordnet, der den Raum im Gehäuse in einen Flüssigkeitsraum 19 und einen Gasraum 20 unterteilt. Im Flüssigkeitsraum 19 ist ein Ventilkolben 21 verschiebbar angeordnet, um die Oeffnung 16 im Unterteil 15 zu öffnen bzw. zu schliessen.The pressure accumulator 3 has a cylindrical housing, consisting of a lower part 15 which is open on one side and has a bore 16 in the other end wall (FIG. 2) and an end cap 17 which can be screwed onto the open end of the lower part 15. A storage piston 18 is arranged axially displaceably in the housing, which divides the space in the housing into a liquid space 19 and a gas space 20. A valve piston 21 is displaceably arranged in the liquid space 19 in order to open or close the opening 16 in the lower part 15.

Im Flüssigkeitsraum 19 ist eine Feder 22 angeordnet, um den Ventilkolben 21 gegen die Oeffnung 16 zu drücken, während im Gasraum 20 eine weitere Feder 23 angeordnet ist, um den Speicherkolben 18 gegen den Flüssigkeitsraum 19 vorzuspannen. Der Druckspeicher ist ferner mit einem Vorhubventil 24 versehen.A spring 22 is arranged in the liquid space 19 in order to press the valve piston 21 against the opening 16, while a further spring 23 is arranged in the gas space 20 in order to bias the storage piston 18 against the liquid space 19. The pressure accumulator is also provided with a preliminary stroke valve 24.

Der Druckspeicher 3 ist in eine Ausnehmung im Werkzeughalter 1 so montiert, dass die Oeffnung 16 im Unterteil 15 mit einer Bohrung 26 fluchtet, die in die Kammer 4 mündet.The pressure accumulator 3 is mounted in a recess in the tool holder 1 so that the opening 16 in the lower part 15 is aligned with a bore 26 which opens into the chamber 4.

Wie insbesondere Figur 2 zeigt, hat die Oeffnung 16 im Gehäuseunterteil 15 eine Sitzfläche, die mit einer ersten Sitzfläche an einem rohrförmigen Ansatz 25 am Ventilkolben 21 zusammenwirkt, um die Oeffnung 16 am Druckspeicher zu öffnen bzw. zu schliessen. Der Ansatz 25 am Ventilkolben 21 hat ferner eine zweite Sitzfläche, die mit dem Vorhubventilkörper 24 zusammenwirkt.As FIG. 2 shows in particular, the opening 16 in the lower housing part 15 has a seat which cooperates with a first seat on a tubular extension 25 on the valve piston 21 in order to open or close the opening 16 on the pressure accumulator. The extension 25 on the valve piston 21 also has a second seat, which interacts with the pre-stroke valve body 24.

Wie eingangs erwähnt, muss der Arbeitshub des Werkzeuges an die Cliphöhe angepasst werden. Die nachfolgende Beschreibung der Funktion der Vorrichtung geht nun davon aus, dass die Anpassung nicht vorgenommen worden ist und das Werkzeug einen kleinen Arbeitshub ausführt, obwohl ein grösserer Arbeitshub erforderlich ist.As mentioned at the beginning, the working stroke of the tool must be adapted to the clip height. The following description of the function of the device now assumes that the adaptation has not been carried out and that the tool carries out a small working stroke, although a larger working stroke is required.

Wird nach Inbetriebsetzung der Maschine das Werkzeug geschlossen, so werden der Stempel und die Matrize vor Ende des Arbeitshubes aufeinandergepresst. Der dabei auftretende Druck wird auf die in der Kammer 4 vorhandene Flüssigkeit übertragen, pflanzt sich durch die Bohrung 26 fort und wirkt auf den Ventilkolben 21 und den daran anliegenden Ventilkörper 24 des Vorhubventils. Durch die Auslegung des Querschnittes des Ventilkörpers 25 des Ventilkolbens 21 unter Einbezug des Ventilkörpers des Vorhubventils 24 mit Bezug auf den Querschnitt des Tauchkolbens 2 kann ein Solldruckwert für den Tauchkolben 2 bestimmt bestimmt werden. Uebersteigt der Istwert in der Kammer 4 diesen Sollwert, wird der Ventilkolben 21 verschoben, und folglich die Kammer 4 über die Bohrung 26 entlastet. Dadurch wird der Tauchkolben 2 verschoben, wodurch der Arbeitshub des Werkzeuges im Sinne einer Verlängerung verstellt wird. Gleichzeitig damit kann die Maschine abgeschaltet und ein akustisches oder visuelles Signal abgegeben werden.If the tool is closed after starting up the machine, the punch and the die are pressed together before the end of the working stroke. The pressure that occurs is transferred to the liquid present in the chamber 4, propagates through the bore 26, and acts on the valve piston 21 and the valve body 24 of the pre-stroke valve that bears against it. By designing the cross section of the valve body 25 of the valve piston 21, including the valve body of the pilot valve 24 with reference to the cross section of the plunger 2, a setpoint pressure value for the plunger can be obtained 2 can be determined. If the actual value in the chamber 4 exceeds this target value, the valve piston 21 is displaced and consequently the chamber 4 is relieved via the bore 26. As a result, the plunger 2 is displaced, whereby the working stroke of the tool is adjusted in the sense of an extension. At the same time, the machine can be switched off and an acoustic or visual signal can be emitted.

Um die danach erforderliche Arbeitsverstellung durchzuführen, wird das Vorhubventil betätigt. Dadurch kann der Tauchkolben 2 drucklos verstellt werden. Durch den Druckspeicher 3 wird anschliessend die Flüssigkeit wieder zurückgespeist.In order to carry out the required work adjustment afterwards, the pre-stroke valve is actuated. As a result, the plunger 2 can be adjusted without pressure. The liquid is then fed back through the pressure accumulator 3.

Claims (9)

  1. Device for limiting the closing pressure of a tool with a punch and a die, characterized by a plunger piston (2) connected to said punch (13) and arranged in a liquid filled chamber (4), and by an accumulator (3) connected to said chamber (4) which responds to a pressure value in said chamber (4) corresponding to a nominal closing pressure, for extending the travel between punch (13) and die.
  2. Device according to claim 1, characterized in that said accumulator (3) is a piston-type pressure accumulator.
  3. Device according to one of claims 1 or 2, characterized in that said accumulator (3) is provided with a relief valve (24) for pressureless adjustment of said plunger piston (2).
  4. Device according to claim 3, characterized in that the inlet of said relief valve (24) opens to said chamber (4).
  5. Device according to one of claims 1 to 4, characterized in that said accumulator (3) is provided with a cylindrical housing with a lower part (15) having an opening (16) to said chamber (4) at one end thereof, and with an end cap (17) for closing said lower part (15) at its other end, an accumulator piston (18) slidably arranged in said lower part (15) and dividing the hollow space within said housing into a liquid containing space (19) and a gas containing space (20), and a valve piston (21) which is slidably arranged in said liquid containing space (19), for opening or closing, respectively, of said opening (16) of said housing.
  6. Device according to claim 5, characterized in that said valve piston (21) comprises a tube-like flange (25) having an outer seat working together with a seat of the opening (16) for closing said liquid containing space (19) of the accumulator (3) against said chamber (4), and an inner seat working together with a seat on the valve body of said relief valve (24) for pressure-less adjustment of said plunger piston (2).
  7. Device according to claim 6, characterized by a spring (22) for pushing said valve piston (21) against the seat in said opening (16) of said accumulator (3).
  8. Device according to one of claims 5 to 7, characterized in that a spring (23) is provided for biasing said accumulator piston (18) against the liquid containing space (19).
  9. Device according to one of claims 1 to 8, characterized in that said plunger piston (2) is arranged in a tool holder (1) and provided with an indicator (9), and that said tool holder (1) is provided with an indicator scale (10) for adjusting said plunger piston (2) within said chamber (4).
EP91106027A 1990-07-16 1991-04-15 Device for limiting the pressure of a tool with a punch and a die Expired - Lifetime EP0467020B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT91106027T ATE97372T1 (en) 1990-07-16 1991-04-15 PRESSURE LIMITING DEVICE FOR A TOOL WITH PUNCH AND DIE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2362/90A CH679903A5 (en) 1990-07-16 1990-07-16
CH2362/90 1990-07-16

Publications (2)

Publication Number Publication Date
EP0467020A1 EP0467020A1 (en) 1992-01-22
EP0467020B1 true EP0467020B1 (en) 1993-11-18

Family

ID=4232021

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91106027A Expired - Lifetime EP0467020B1 (en) 1990-07-16 1991-04-15 Device for limiting the pressure of a tool with a punch and a die

Country Status (5)

Country Link
EP (1) EP0467020B1 (en)
AT (1) ATE97372T1 (en)
CH (1) CH679903A5 (en)
DE (1) DE59100605D1 (en)
ES (1) ES2046815T3 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19738298C1 (en) 1997-09-02 1999-04-08 Poly Clip System Gmbh & Co Kg Method for setting up a closing machine and device for closing closing clips
DE20314562U1 (en) * 2003-09-19 2003-12-04 Poly-Clip System Gmbh & Co Kg Clip machine drive
DE102005026219B4 (en) 2005-06-07 2007-12-13 Poly-Clip System Gmbh & Co. Kg Clip machine and method for setting up a clip machine
ES2324541T3 (en) 2005-08-26 2009-08-10 Tipper Tie Alpina Ag PROCEDURE AND DEVICE FOR CLOSING WITH PACKING CLIPS IN THE FORM OF SAUSAGE.
AU2007212144B2 (en) 2006-02-03 2011-07-07 Poly-Clip System Corp. Clip control system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3383754A (en) * 1967-01-10 1968-05-21 Rheem Mfg Co Fluid driven mechanism with protective stroke for applying a clip around a casing
US3913628A (en) * 1971-05-10 1975-10-21 Kartridg Pak Co Method and apparatus for hermetically sealing a package

Also Published As

Publication number Publication date
CH679903A5 (en) 1992-05-15
EP0467020A1 (en) 1992-01-22
ATE97372T1 (en) 1993-12-15
DE59100605D1 (en) 1993-12-23
ES2046815T3 (en) 1994-02-01

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