EP0895933B2 - Dispositif de levage pour une station d'opération d'une machine d'emballage - Google Patents

Dispositif de levage pour une station d'opération d'une machine d'emballage Download PDF

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Publication number
EP0895933B2
EP0895933B2 EP97113794A EP97113794A EP0895933B2 EP 0895933 B2 EP0895933 B2 EP 0895933B2 EP 97113794 A EP97113794 A EP 97113794A EP 97113794 A EP97113794 A EP 97113794A EP 0895933 B2 EP0895933 B2 EP 0895933B2
Authority
EP
European Patent Office
Prior art keywords
lifting device
lifting
rollers
piston
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
EP97113794A
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German (de)
English (en)
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EP0895933A1 (fr
EP0895933B1 (fr
Inventor
Johann Natterer
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.)
Multivac Sepp Haggenmueller GmbH and Co KG
Original Assignee
Multivac Sepp Haggenmueller GmbH and Co KG
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.)
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Publication date
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Application filed by Multivac Sepp Haggenmueller GmbH and Co KG filed Critical Multivac Sepp Haggenmueller GmbH and Co KG
Priority to EP97113794A priority Critical patent/EP0895933B2/fr
Priority to DE59709858T priority patent/DE59709858D1/de
Priority to ES97113794T priority patent/ES2197273T5/es
Priority to US09/126,474 priority patent/US6006505A/en
Priority to JP10225879A priority patent/JP3041606B2/ja
Publication of EP0895933A1 publication Critical patent/EP0895933A1/fr
Publication of EP0895933B1 publication Critical patent/EP0895933B1/fr
Application granted granted Critical
Publication of EP0895933B2 publication Critical patent/EP0895933B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B65/00—Details peculiar to packaging machines and not otherwise provided for; Arrangements of such details
    • B65B65/02—Driving gear
    • 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
    • B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
    • B65B31/02—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas
    • B65B31/021—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas the containers or wrappers being interconnected

Definitions

  • the invention relates to a lifting device for a workstation of a packaging machine according to the preamble of claim 1.
  • a packaging machine has workstations for various functions such as forming, filling, sealing and cutting. At least one movable part of a workstation is brought into the working position via a hoist. In this position, an increased force to close the tool parts of the workstation is required to hold a packing web for the operation and then perform the operation. For example, to form a sheet of plastic material, a chamber is hermetically closed and then the web is deformed with fluid from a source of compressed air. In this case, high pressures are used for a quick and detailed shaping, which exert high forces on the forming station.
  • a lifting device for a cutting station of a packaging machine with the features of the preamble of claim 1 is known.
  • the piston rod which is formed at its free end as an abutment is raised by inserting a wedge-shaped element in a corresponding recess of the piston rod by a further piece at the end of the stroke by a piston-cylinder device, so that in the reached as end position by the piston rod, a force is exerted that is higher than the force applied by the piston-cylinder device force.
  • the friction forces occurring during insertion of the wedge cause a faster wear of the material.
  • the object is achieved by a lifting device according to claim 1.
  • the lifting device has the advantage that the closing operation of the workstation takes place in two steps: The first closing movement into the working position takes place over a larger path and requires a relatively small force. The power generation for the working operation then takes place via a second closing movement, wherein the active forces are absorbed during the operation. A power stroke element generates the necessary force for the second closing movement independently of the device which effects the first closing movement. The required force is always generated at the end of the closing process, regardless of an exact dead center.
  • the lifting device also has the advantage that the power stroke element for generating the second closing movement is compact and thus space-saving constructed and that it has a high wear resistance.
  • the packaging machine has a machine frame 1 and, arranged in succession, a forming station 2, an evacuation and sealing station 3 and a cutting device 4.
  • a film web 5 is introduced from the input side into the machine.
  • containers 6 are formed from the film web. These are sealed after filling in a filling station, not shown in the figure in the evacuation and sealing station 3 with a top film and finally separated by means of the cutter 4 from each other.
  • the machine frame 1 also has the guide for a chain drive (not shown) for conveying the film web 5 or the packaging container 6 formed therefrom.
  • a work station which is shown here by way of example as an evacuation and sealing station 3, has a base part 7, a tool upper part 8 fixedly connected thereto, and a tool lower part 9 movable relative thereto.
  • the base part 7 and the upper tool part 8 of the workstation are connected to one another via guide rods 10.
  • the lifting device is a lifting device for moving the tool lower part 9 relative to the upper tool 8 from an open position shown in Figures 2 and 3 in a closed position shown in Figures 4 and 5, in which the lower tool part 9 and the upper tool 8 cooperate provided.
  • the lifting device has two connected via a yoke 11 piston-cylinder devices 12.
  • the cylinders 13 of each piston-cylinder device 12 are each connected to the base part 7, while the piston rods 14 are each connected to the yoke 11, which in turn carries the lower tool part 9.
  • the yoke 11 and the tool base 9 connected thereto are connected to guide bushes 15 sliding on the guide rods 10.
  • the piston-cylinder devices 12 are designed so that they can move the lower tool part 9 in a first closing movement over a large stroke in a size to over 200mm from the open position to the closed position and vice versa.
  • the lifting device has a second lifting element, a so-called force lifting element 20, for generating force via a second closing movement with a shorter stroke relative to the first closing movement.
  • the power stroke element 20 has a fixed to the base part 7 housing 21 and a movable therein in the stroke direction part in the form of a lifting rod 22 which is fixedly connected at its the tool base 9 end facing the yoke 11 and thus with the lower tool part 9.
  • the power stroke element 20 has a drive in the form of a piston-cylinder device 23, whose cylinder or center axis M is aligned parallel to the stroke direction of the tool lower part 9.
  • the piston-cylinder device 23 has a cylinder 24 and a piston 25 displaceable therein.
  • the cylinder 24 has on its side facing the tool lower part 9 end face 26 an opening 27, through which the lifting rod 22 is slidably guided via slide bearings and sealed by seals 28 relative to the cylinder chamber.
  • the piston 25 has a corresponding opening 29 through which the lifting rod 22 is passed accordingly.
  • a piston rod connected to the piston 25 is formed in the form of a sleeve 30 through which the lifting rod 22 is passed accordingly and slidable via slide bearings. Further, the piston-cylinder device 23 has an inlet 31 and an outlet 32 for compressed air in the cylinder chamber.
  • the piston-cylinder device 23 is connected to a housing 21 of the power stroke element 20, which receives the mechanical power transmission elements described below.
  • the housing 21 has a rectangular cross section in a plane perpendicular to the center axis M and forms a chamber 50 with its side walls for receiving the mechanical power transmission elements.
  • the housing 21 On its underside 51, the housing 21 has an opening 52 which connects the chamber 50 with a second chamber 53 of lesser cross section. As can be seen in particular from FIG. 7 a, the second chamber 53 completely accommodates the free end 60 of the lifting rod 22 in the open position of the workstation.
  • the free end 60 of the lifting rod 22 has an end piece or pressure part 61, which essentially has the shape of an inverted roof gable, and therefore, as shown particularly in FIG. 6 can be seen, in a plane parallel to the center axis M has triangular cross-section.
  • the pressure member 61 has two flat surfaces 61 a, 61 b, which are each aligned at an acute angle to the center axis M.
  • a gate 55 is provided which is fixedly connected at its upper, the piston-cylinder device end facing the sleeve 30 and which is displaceable in the chamber 50 between the chamber ceiling and the chamber bottom up and down.
  • the slide is formed from two parts and, as can be seen in particular from FIGS. 6 and 7a to 7d, has two guide grooves 70a, 70b on each of its surfaces facing the interior of the chamber, in each of which the ends are guided by roller pairs 80 extending transversely through the chamber 50. So there are a total of four rollers 80 are provided.
  • the guide grooves 70a, 70b each extend at an obtuse angle to the center axis M.
  • the rollers 80 are movable in the guide grooves but positively guided.
  • the upper longitudinal edges of belonging to a pair of rollers opposite guide grooves 70a. define a first plane 71a of the force transmission from the link 55 to this pair of rollers, which is at an obtuse angle to the center axis M.
  • an abutment 90 is provided for the rollers 80.
  • the abutment 90 is formed symmetrically and has two each extending at an acute angle to the center axis surfaces 90a, 90b, on each of which a pair of rollers 80 is supported.
  • the angle which the surfaces 90a, 90b include with the center axis M differs from the angle which the surfaces 61a, 61b of the end piece in each case enclose with the center axis M such that a second plane passing through the surface 90a is opposite to one through the Surface 61a extending third level is slightly inclined and thus the two levels include a wedge angle between them.
  • the first plane is substantially perpendicular to the second plane.
  • the inclination of the three planes to one another determines the force transmission ratio between the force F 1 applied by the piston-cylinder device 23 and the force F 2 exerted on the tool lower part 9 by means of the lifting rod 22 during the second closing movement.
  • the mechanical force transmission device is thus designed such that it has a nearly constant force curve, wherein when a resistance occurs, the force for the second closing movement is generated.
  • the lifting device In the open position of the work station shown in Figures 2 and 3, in which the lower tool part 9 and the upper die 8 are separated from each other, the lifting rod 22 is in its lowest position in which it is fully inserted into the Kraftthubelement 20.
  • the piston 25 of the piston-cylinder device 23 is located at the upper stop (Fig. 7a). Then, the piston-cylinder devices 12 are activated for the first closing movement, wherein the lower tool part 9 performs a first closing path with a stroke distance of up to over 200mm.
  • the lifting rod 22 Since the lifting rod 22 is connected to the yoke 11 and is displaceable within the Kraftstubiatas 20, it is pulled up to the stroke of the first closing path and is then in the position shown in Fig. 7b, wherein the lower tool part 9 and the upper die 8 are in the closed position shown in Figures 4 and 5.
  • the piston-cylinder device 23 of the Krafthubiatas 20 is actuated and initiated the second closing movement.
  • 23 compressed air is supplied via the compressed air inlet 31 of the piston-cylinder device.
  • the sleeve 30 pushes the link 55 with a force F 1 down.
  • the first planes 71a and 71b formed by the guide grooves each transmit the force exerted by the sleeve 30 on the link 55 force on the pairs of rollers 80.
  • the pairs of rollers 80 are each forced in the guide grooves 70a, 70b and of the inclined surfaces 90a, 90b of the abutment 90 experience a counterforce, they differ in the downward movement of the guide 55 in the guide grooves each upwards and engage with the inclined surfaces 61a, 61b of the pressure member 61 of the lifting rod 22 (Fig. 7c).
  • the rollers of each roller pair then roll in the downward movement of the link 55 in each case on the surface of the abutment and the opposite surface of the tail in opposite directions from rotating. Since the respective surface of the abutment 90a, 90b includes a wedge angle with the respective opposite surface of the pressing member 61a and 61b, the rollers exert a force on the pressing member 61.
  • FIGS. 8a to 8c the principle of force transmission from the piston-cylinder device 23 via the link 55 and the pairs of rollers 80 to the lifting rod 22 is again shown with reference to one half of the mechanical transmission device.
  • F 2 a force which is greater than the force of the piston-cylinder device 23.
  • a closing force can be generated which is two to 30 times as large as the force generated by the drive.
  • a geometry is chosen in which the closing force is about 10 times as large as the force generated by the drive of the piston-cylinder device 23.
  • the second closing path of the lower tool part 9 relative to the upper tool 8 is in the order of about 1mm to about 10mm.
  • the achievable closing forces over the second closing path are in the range of about 25kN to 150kN, depending on the size and function of the station.
  • the lifting device may have one, two or more piston-cylinder devices for the first closing movement. It can also have two or more power stroke elements for the second closing movement.
  • the lifting device additionally comprises a lever system 100 shown in FIGS. 2 to 5 between the movable tool lower part 9 of the station and the machine frame 1 in order to lift the entire hoist, coupled with the movement of the movable tool lower part 9 to the open position and thus the otherwise fixed tool upper part 8 away from the film web 5.
  • the lever system 100 connects the lower tool part 9 to the base part 7 of the work station and to the machine frame 1.
  • the lever system 100 has two two-armed levers 101a, 101b.
  • the pivot point 102a, 102b of each lever 101a, 101b is in each case articulated via a connecting rod 106a, 106b at a point 107a, 107b of the machine frame 1, wherein the connecting rods 106a, 106b are rotatably mounted at the articulation points 107a, 107b.
  • the one outer end of the levers 101a, 101b is rotatably connected to the base part 7 via a rotary joint 103a, 103b, respectively.
  • the other outer end of the levers 101a, 101b is connected to the yoke 11 via a connecting rod 104a, 104b, respectively, with both the linkage points 105a, 105b of the connecting rods on the yoke and the linkage points 108a, 108b of the connecting rods on the lever being made rotatable.
  • the connecting rods 104a, 104b thus serve to transmit the up or down movement of the tool lower part 9 to the levers 101a, 101b and thus to the base part 7.
  • a lowering of the lower tool part 9 in the open position of the workstation simultaneously causes a lifting of the base part 7 and thus the entire lifting device relative to the machine frame 1. Since the upper tool 8 is rigidly connected to the base part 7, thus the upper tool 8 is relative to the machine frame 1 and thus raised relative to the film web 5. Thus, packages 6, which have an expansion downwards and upwards, can be easily forwarded.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Manipulator (AREA)
  • Transmission Devices (AREA)

Claims (16)

  1. Dispositif élévateur pour une station de travail d'une machine d'emballage, la station de travail présentant une première partie d'outil (8) et une deuxième partie d'outil (9) mobile par rapport à celle-ci, comprenant un premier élément élévateur (12) destiné à produire un premier mouvement de fermeture de la deuxième partie d'outil (9) contre la première partie d'outil (8) et
    un deuxième élément élévateur (20, 22) destiné à produire un deuxième mouvement de fermeture après le premier mouvement de fermeture, caractérisé en ce que
    le deuxième élément élévateur (20, 22) comprend un entraînement (23) et un dispositif de transformation de mouvement mécanique (55, 80, 90, 61) ayant un profil de force presque constant, qui est constitué de manière que la force pour le deuxième mouvement de fermeture soit produite à l'apparition d'une résistance, et
    en ce que le dispositif de transformation mécanique (50, 80, 90, 61) comprend des rouleaux (80) disposés entre trois plans (71a, 90a, 61a ; 71b, 90b, 61b), les deuxième et troisième plans (90a, 90b, 61a, 61b) formant un angle de coin entre eux, l'élévation pour le deuxième mouvement de fermeture est produite par le fait que, lors du déplacement du premier plan (71a ; 71b) exécuté au moyen de l'entraînement (23) pour passer d'une première position à une deuxième position, les rouleaux (80) sont déplacés entre le deuxième plan (90a ; 90b) et le troisième plan (61a ; 61b) de telle manière que la distance entre le deuxième plan (90a ; 90b) et le troisième plan (61a ; 61b) soit agrandie.
  2. Dispositif élévateur selon la revendication 1, caractérisé en ce que le premier plan (71a ; 71b) est relié à l'entraînement (23, 25, 30, 55), le deuxième plan (90a ; 90b) à une base (7) de la station de travail et le troisième plan (61a ; 61b) à une partie (22) reliée à la deuxième partie d'outil (9).
  3. Dispositif élévateur selon la revendication 2, caractérisé en ce que l'entraînement (23) est constitué par un dispositif à piston et cylindre (24, 25) et la partie (22) reliée à la deuxième partie d'outil (9) est constituée par une tige élévatrice pouvant être mise en mouvement alternatif dans la direction de l'élévation par un dispositif à piston et cylindre.
  4. Dispositif élévateur selon la revendication 3, caractérisé en ce que le deuxième élément élévateur (20) comprend un carter (21) qui est relié à la base (7) de la station de travail et dans lequel est prévue une coulisse (55) munie de rainures de guidage (70a, 70b) pour les rouleaux (80), qui est reliée au piston (25) et qui peut être élevée et abaissée dans le carter et en ce que le carter présente un appui de réaction (90) pour les rouleaux.
  5. Dispositif élévateur selon la revendication 4, caractérisé en ce que la tige élévatrice (22) présente à son extrémité libre une partie de pression (61) qui présente elle-même au moins une surface (61a; 61b) s'étendant obliquement par rapport à la direction de l'élévation, qui définit le troisième plan, et l'appui de réaction (90) pour les rouleaux (80) présente aussi une surface (90a ; 90b) s'étendant obliquement par rapport à la direction d'élévation, qui définit le deuxième plan, les deux surfaces étant inclinées l'une par rapport à l'autre en forme de coin.
  6. Dispositif élévateur selon la revendication 5, caractérisé en ce que les rainures de guidage (70a ; 70b) pour les rouleaux s'étendent sensiblement perpendiculairement au deuxième plan défini par la surface de l'appui de réaction (90a ; 90b), un bord supérieur de deux rainures de guidage servant à guider un rouleau, bord qui est dirigé vers le piston (25) du dispositif à piston et cylindre, définissant le premier plan (71a ; 71b).
  7. Dispositif élévateur selon la revendication 6, caractérisé en ce que, lors du déplacement de la coulisse (55) exécuté au moyen de l'entraînement, les rouleaux (80) roulent entre la surface de l'appui de réaction (90a ; 90b) et la surface de la partie de pression (61a ; 61b), les rouleaux étant alors guidés positivement dans les rainures de guidage (70a ; 70b) de la coulisse de telle manière qu'en réponse à un déplacement de la coulisse en sens inverse du sens de l'élévation, la distance entre la surface de l'appui de réaction et la surface de la partie de pression s'agrandit sous l'effet de la force exercée par les rouleaux sur la partie de compression, en ce sens que la tige élévatrice (22) est mise en mouvement dans la direction de l'élévation.
  8. Dispositif élévateur selon la revendication 7, caractérisé en ce que la tige élévatrice est guidée en position centrale par le piston et en ce que la coulisse (55), l'appui de réaction (90) et la tige élévatrice (22, 61) sont construits symétriquement par rapport à l'axe (M) du cylindre du dispositif à piston et cylindre (23).
  9. Dispositif élévateur selon une des revendications 1 à 8, caractérisé en ce qu'il est prévu deux paires de rouleaux.
  10. Dispositif élévateur selon une des revendications 1 à 9, caractérisé en ce que le rapport de transmission de force entre la force (F1) appliquée par l'entraînement et la force (F2) résultante exercée sur la deuxième partie d'outil (8) lors du deuxième mouvement de fermeture, est déterminé par l'inclinaison des trois plans l'un par rapport à l'autre.
  11. Dispositif élévateur selon une des revendications 1 à 10, caractérisé en ce que la géométrie du dispositif de transformation mécanique est conçue de manière que soit produite une force de fermeture qui vaut deux fois à trente fois la force qui est produite par l'entraînement (23).
  12. Dispositif élévateur selon la revendication 11, caractérisé en ce que la force de fermeture est à peu près dix fois plus grande que la force qui est produite par l'entraînement (23).
  13. Dispositif élévateur selon une des revendications 1 à 12, caractérisé en ce que la longueur de la première course de fermeture peut valoir jusqu'à plus de 200 mm et que la longueur de la deuxième course de fermeture est dans l'intervalle d'environ 1 mm à environ 10 mm.
  14. Dispositif élévateur selon une des revendications 1 à 13, caractérisé en ce que la force de fermeture produite au moyen du deuxième élément élévateur (20) est comprise entre environ 25 kN et environ 150 kN.
  15. Dispositif élévateur selon une des revendications 1 à 14, caractérisé en ce qu'il est prévu entre la partie inférieure d'outil (9) et un bâti (1) de la machine, un système de leviers (100) qui est réalisé de manière que, en accouplement avec le mouvement de la partie inférieur d'outil (9) aboutissant à une position ouverte, l'ensemble du dispositif élévateur soit soulevé et que, de cette façon, la partie supérieure d'outil (8) qui, autrement, est fixe, soit éloignée de la bande de matière (5).
  16. Machine d'emballage comprenant un dispositif élévateur selon une des revendications 1 à 15.
EP97113794A 1997-08-08 1997-08-08 Dispositif de levage pour une station d'opération d'une machine d'emballage Expired - Lifetime EP0895933B2 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP97113794A EP0895933B2 (fr) 1997-08-08 1997-08-08 Dispositif de levage pour une station d'opération d'une machine d'emballage
DE59709858T DE59709858D1 (de) 1997-08-08 1997-08-08 Hubeinrichtung für eine Arbeitsstation einer Verpackungsmaschine
ES97113794T ES2197273T5 (es) 1997-08-08 1997-08-08 Dispositivo de elevacion para una estacion de trabajo de una maquina envasadora.
US09/126,474 US6006505A (en) 1997-08-08 1998-07-30 Lifting device for a working station of a packaging machine
JP10225879A JP3041606B2 (ja) 1997-08-08 1998-08-10 リフト装置及びパッケージング機

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97113794A EP0895933B2 (fr) 1997-08-08 1997-08-08 Dispositif de levage pour une station d'opération d'une machine d'emballage

Publications (3)

Publication Number Publication Date
EP0895933A1 EP0895933A1 (fr) 1999-02-10
EP0895933B1 EP0895933B1 (fr) 2003-04-16
EP0895933B2 true EP0895933B2 (fr) 2007-03-07

Family

ID=8227191

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97113794A Expired - Lifetime EP0895933B2 (fr) 1997-08-08 1997-08-08 Dispositif de levage pour une station d'opération d'une machine d'emballage

Country Status (5)

Country Link
US (1) US6006505A (fr)
EP (1) EP0895933B2 (fr)
JP (1) JP3041606B2 (fr)
DE (1) DE59709858D1 (fr)
ES (1) ES2197273T5 (fr)

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JP3041606B2 (ja) 2000-05-15
EP0895933A1 (fr) 1999-02-10
US6006505A (en) 1999-12-28
DE59709858D1 (de) 2003-05-22
ES2197273T3 (es) 2004-01-01
JPH11147512A (ja) 1999-06-02
ES2197273T5 (es) 2007-11-01
EP0895933B1 (fr) 2003-04-16

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