EP0249059B1 - Pneumatic drive for a punching, cutting and stamping device - Google Patents

Pneumatic drive for a punching, cutting and stamping device Download PDF

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Publication number
EP0249059B1
EP0249059B1 EP87107223A EP87107223A EP0249059B1 EP 0249059 B1 EP0249059 B1 EP 0249059B1 EP 87107223 A EP87107223 A EP 87107223A EP 87107223 A EP87107223 A EP 87107223A EP 0249059 B1 EP0249059 B1 EP 0249059B1
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EP
European Patent Office
Prior art keywords
piston
cylinder
piston rod
pneumatic
accordance
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
EP87107223A
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German (de)
French (fr)
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EP0249059A1 (en
Inventor
Alfred Dipl.-Ing. Schmeck
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.)
Kramer and Grebe & Co KG Maschinenfabrik GmbH
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Kramer and Grebe & Co KG Maschinenfabrik GmbH
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Application filed by Kramer and Grebe & Co KG Maschinenfabrik GmbH filed Critical Kramer and Grebe & Co KG Maschinenfabrik GmbH
Priority to AT87107223T priority Critical patent/ATE50722T1/en
Publication of EP0249059A1 publication Critical patent/EP0249059A1/en
Application granted granted Critical
Publication of EP0249059B1 publication Critical patent/EP0249059B1/en
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/04—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member
    • B26D1/06—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates
    • B26D1/08—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates of the guillotine type
    • B26D1/09—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates of the guillotine type with a plurality of cutting members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D5/08—Means for actuating the cutting member to effect the cut
    • B26D5/12—Fluid-pressure means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/869—Means to drive or to guide tool
    • Y10T83/8735—With means providing for plural steps in tool stroke
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/869—Means to drive or to guide tool
    • Y10T83/8821—With simple rectilinear reciprocating motion only
    • Y10T83/8827—Means to vary force on, or speed of, tool during stroke
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/869—Means to drive or to guide tool
    • Y10T83/8821—With simple rectilinear reciprocating motion only
    • Y10T83/8858—Fluid pressure actuated
    • Y10T83/8864—Plural cylinders

Definitions

  • the invention relates to a compressed air drive for punching, cutting and embossing devices, with two mutually movable tool parts, one of which is advantageously firmly connected to the machine frame at least in the working position, in particular for cutting devices for packaging machines with a large opening width.
  • the invention is based on the object of designing a drive for punching, cutting and embossing devices of the type mentioned at the outset such that they can be produced with an essentially arbitrarily large opening gap so that they can be operated with a low pressure when the tool parts are moved together, so that additional safety devices can be dispensed with, that the drive is simple in construction and economical in production with a relatively small construction volume, and that the required clamping force and thus cutting, embossing and punching force can be generated at the same time.
  • the compressed air drive for punching, cutting and embossing devices thus consists of at least one compressed air cylinder which is connected to the movable tool part.
  • the piston rod of the compressed air cylinder is connected to a further piston rod of a second compressed air clamping element, which can be fixed on the machine frame. If a flat top film is used here, it can be permanently connected to the machine frame. In the other case, this must also be designed to be raised and lowered.
  • the compressed air cylinder which is connected to the movable tool part, can be designed with the required length, so that this tool part occupies the required opening gap for the further transport of the packaging.
  • This compressed air cylinder can be subjected to a relatively low pressure, so that the force exerted by it is below 15 kp, i.e. under a force at which no injuries are to be feared and additional safety devices are therefore unnecessary.
  • the piston rod is mechanically blocked, whereby this blocking device can be integrated inside the air pressure cylinder or by means of a bolt which is inserted into a recess in the piston rod and thus fixes it relative to the cylinder.
  • the lower tool part rests on the knife with a contact pressure of less than 15 kp.
  • compressed air is added to the compressed air clamping element, so that the now locked piston rod is acted upon with great force, which can be 9 t and more, and so the knife is pressed against the abutment, so that the film is divided.
  • the compressed air tensioning element consists of several piston cylinder units connected in series, whereby the diameter of the compressed air tensioning element can be kept relatively small with a high force generation.
  • the path that the compressed air clamping element has to cover can then only be a few mm, which e.g. is sufficient for cutting a film. However, this path can also be increased at the expense of the overall height, e.g. to be sufficient for embossing and punching devices.
  • the compressed air tensioning element advantageously consists of a plurality of individual parts which are held in a ring and pressed against one another and have a central bore through which the piston rod engages.
  • a tubular extension arranged on the piston engages through this central bore, wherein each piston is supported on the preceding and following pistons, so that with a relatively small diameter with a plurality of pistons arranged one behind the other, a high compressive force can be built up.
  • the compressed air inlets and outlets are obtained in the ring-shaped parts through bores which penetrate them and which lie one above the other after assembly. This makes it possible to supply the large number of piston units one behind the other with two external compressed air connections.
  • two drive units are advantageously used, which are arranged on both sides of the cutting device, the two compressed air clamping elements being connected to one another via plates to which the one tool part carrying the knife is fastened.
  • a device according to the invention thus allows opening gaps of any size to be produced between the two tool parts, which are only limited by the height of the machine frame.
  • the device according to the invention consists of comparatively few individual parts which are inexpensive to manufacture and thus lead to a very economical construction which works without wear and yet delivers the required large contact pressures.
  • the two tool parts are moved together at a relatively low pressure, not only is a safety device saved, but the air consumption as such is also significantly reduced.
  • the actual working stroke, which is carried out with a high air pressure, is thus limited to the minimum, so that the device as a whole works very economically.
  • a cutting device 2 of a packaging device I which has an upper tool part 3, which carries the knife 4, and a lower tool part 5, which serves as a counter bearing for the knife 4.
  • FIG. 1 shows the containers 6 in side view and in section, which are formed from a lower film 7, which is deformed like a cup, and an upper film 8.
  • the top and bottom films have been welded together in a known manner in a sealing station arranged in front of the cutting station.
  • the cutting device 2 By means of the cutting device 2, the containers 6 are separated in the transverse position in the region of the intermediate space 9 formed between them.
  • the upper film 8 is flat, so that the upper tool part 3 can be connected to the machine frame 10 in a stationary manner.
  • two guide strips 11 are arranged in each case, which receive guide profiles 12 which have a recess corresponding to the guide strips II.
  • These guide profiles are adjustable along the machine frame 10 so that the cutting device 2 can be adjusted accordingly depending on the respective sizes of the containers 6.
  • a toothing 13 is attached to the top of the guide strips 11, into which a gearwheel 14 rotatably arranged on the machine frame 10 engages.
  • the two gear wheels, which each engage in the guide bar II on the two sides of the foils 7, 8, are connected to one another via an axis 15, so that tilting is avoided when the cutting device 2 is displaced.
  • a handwheel 16 is fastened on one side on the axis 15, which projects laterally beyond the machine frame 10 on one side.
  • the chain guides 17, 18 for an endless chain are arranged, which have clamping elements 19 with which the bottom film 7 is gripped and transported at the edges. With the help of these chains, the containers are transported in cycles and positioned in the corresponding position of the cutting device 2.
  • a compressed air tensioning element 20 which consists of several piston cylinder units connected in series and has a piston rod 21 common to all piston cylinder units, is fixedly connected to the guide profile 12.
  • Each compressed air clamping element 20 has a base 22 which is screwed to the guide profile 12.
  • Two plates 23, which connect the compressed air tensioning elements 20 to one another, are fastened to this socket 22 and are thus fixed in place on the machine frame 10 via the socket 22.
  • the plates 23 are arranged parallel to one another and lie on edge, as can best be seen from FIG. 1.
  • two plates 24, 25 receiving and supporting the knife 4 of the cutting device are fastened by means of screws 26 which engage in lateral projections 27 of the plates 23.
  • the lower tool part 5 consists of a plate which extends over the width of the foils 6, 7 and is fastened on both sides to the cylinder wall 28 of a compressed air cylinder 29.
  • the compressed air cylinder has a piston rod 30 and a piston at the end in a known manner ben rod 30 arranged piston 31.
  • the compressed air cylinder is double-acting, the piston rod 30 exiting the cylinder through a hermetically sealing seal.
  • the piston rod 30 is arranged in the extension of the piston rod 21 of the compressed air clamping element and is fixedly connected to it by means of a screw 32.
  • the lower tool part is in the left half of the drawing in a raised, i.e. shown in the cutting position and in the right half of the drawing in the lowered position, i.e. in the position in which the containers 6 can be transported into and out of the cutting device.
  • the knife 4 is somewhat narrower than the width of the bottom film, so that the packaging is still connected at the edges and can therefore be transported further by means of the chains.
  • the length of the compressed air cylinder 29 can be chosen to be of any size, so that an opening gap of any size can be obtained for the transport of the containers 6.
  • the compressed air cylinder 29 - are advantageously subjected to a relatively low pressure, which on the one hand reduces the compressed air consumption and on the other hand has the consequence that the closing force of the compressed air cylinder piston can be kept less than 15 kp. This makes it possible to save on special safety devices, because even if an operator's hand gets between the upper and lower tools during the closing process, no damage can occur here.
  • FIG. 6 which again shows the retracted position in the left half of the drawing and the extended position in the right half of the drawing, the piston rod 30 is automatically in its lower end position, i.e. locked in the closed position of the two tool parts. This is done via a ring 33 which engages in a groove 34 of the piston rod 30.
  • a sleeve 36 is slidably arranged, which cooperates with a spring 37. If there is no pressure in the cylinder space 38, the spring 37 presses the sleeve 36 upward, so that the ring 33 is held in the groove 34 of the piston 30.
  • FIG. 7 and 8 another embodiment of a locking of the piston rod 30 is shown, namely here an eye 41 with a bore 42 is arranged at the end of the piston rod 30, into which a bolt 43 can be inserted, which is connected by a further compressed air cylinder 44 can be actuated.
  • the piston rod 30 In the raised position of the lower tool part 5, i.e. in the position in which the actual cutting force can be built up, the piston rod 30 is locked against the cylinder wall 28 by inserting the bolt 43, so that the lower tool part 5 is now rigidly connected to the piston rod 30.
  • the compressed air clamping element 20 is shown in FIGS. 4 and 5 in an enlarged view.
  • the compressed air clamping element consists of a base 22 on which a plurality of ring elements 45 of the same design are placed, in the exemplary embodiment these are seven pieces.
  • Each ring element has a central bore 46 and a recess 47 arranged on one side and two through bores 48, 49. From these through bores 48, 49 branch off channels 50, 51, which are used to supply compressed air to one side of the annular part 45.
  • the central bore 46 is so large that it serves on the one hand for receiving the piston rod 21 and on the other hand for receiving an annular bushing 52 of a piston 53.
  • the inside of the piston in the area of the bushing 52 has an O-ring seal 54 which seals the piston against the piston rod 21.
  • two further O-ring seals 55, 56 are also arranged on the surfaces lying parallel to the piston rod, which serve to seal the annular part from the piston or the bushing of the piston. All pistons 53 are supported against one another via their bushes 52, so that the force of the individual piston-cylinder units is added, so that, with a relatively small diameter, very high forces can be built up by selecting the number of piston-cylinder units.
  • each piston-cylinder unit is advantageously chosen so that it delivers a pressure force of approximately 600 kp at a pressure of 6 bar.
  • each compressed air clamping element thus delivers approximately 4.2 t, so that a total contact pressure of the knife 4 on the lower tool part 5 of slightly over 8 t is obtained.
  • the path provided by the compressed air clamping element 20 need only be very small.
  • a path of 3 mm has proven to be quite sufficient, so that with the compressed air tensioning device according to the invention, very high compressive forces are generated with a comparatively small diameter and comparatively low overall height can be used for cutting foils.
  • the compressed air clamping element is also characterized by great simplicity in its construction, since it consists essentially of the same annular elements and pistons, which are stacked on one another in any number depending on the required compressive force and then screwed onto the nuts 58 by means of clamping screws 57 will. Only two compressed air connections 59, 60 are required for all piston-cylinder units, specifically for double-acting cylinders.
  • Each ring-shaped element 45 is thus of identical design, these ring-shaped elements being pressed together between the block 22 and an end piece 61, which can basically be designed in the same way as the ring-shaped elements 45, but without the bore 49.
  • the piston rod 21 of the compressed air clamping element 20 is passed through the compressed air clamping element and provided at its end with thread 63, onto which two screws 64 are screwed to fix the piston rod 21 on the compressed air clamping element. This enables simple assembly and disassembly of the clamping element, which can be attached or detached completely assembled to the cutting device 2.

Abstract

A pneumatic drive for punching, cutting and stamping devices, which have two tool parts which can be moved toward one another, and of which preferably one, at least in the operating position, is fixedly connected to the machine frame, is constructed such that an opening gap, which is as large as possible, is created. Furthermore, when the tool parts are moved together, the pneumatic drive is operated at a low pressure, so that additional safety devices are not needed. A pneumatic cylinder is secured on the movable tool part for this purpose, the piston rod of the pneumatic cylinder being constructed lockably in at least one end position. The piston rod of a pressure clamping element is secured on the piston rod exiting from the pneumatic cylinder. The cylinder of the pressure clamping element is arranged or fixably stationarily and consists of at least two piston cylinder units with one common piston rod, which piston cylinder units are connected one behind the other.

Description

Die Erfindung betrifft einen Druckluftantrieb für Stanz-, Schneid- und Prägeeinrichtungen, mit zwei gegeneinander verfahrbaren Werkzeugteilen, von denen vorteilhaft eines zumindest in der Arbeitsstellung mit dem Maschinenrahmen fest verbunden ist, insbesondere für Schneideinrichtungen für Verpackungsmaschinen mit großer Öffnungsweite.The invention relates to a compressed air drive for punching, cutting and embossing devices, with two mutually movable tool parts, one of which is advantageously firmly connected to the machine frame at least in the working position, in particular for cutting devices for packaging machines with a large opening width.

Bei Verpackungsmaschinen ist es bekannt, die Verpackungen aus einer Unter- und einer Oberfolie herzustellen, wobei in die Unter- und/oder die Oberfolie Vertiefungen eingezogen werden. In die Vertiefungen der Unterfolie wird dann die Ware eingelegt und mittels der Oberfolie zu der fertigen Verpackung versiegelt. Im Anschluß an diesen Siegelvorgang werden die Packungen dann vereinzelt, was mittels einer Längsschneid- und einer Querschneideinrichtung erfolgt. Beim Querschneiden der Verpackungen müssen die beiden Werkzeugteile einen relativ großen Hub ausführen, damit diese Werkzeugteile zwischen die napfartig verformte Unterfolie und evtl. auch Oberfolie eingreifen können. Ist die Oberfolie nicht verformt, so ist das obere Werkzeugteil fest mit dem Maschinenrahmen verbunden und lediglich das untere Werkzeugteil wird angehoben und abgesenkt. Bei einer gleichzeitig verformten Oberfolie muß auch das Oberteil angehoben und abgesenkt werden, wobei dieses Oberteil dann in der Schneidstellung fest mit dem Maschinenrahmen verriegelt wird. Aus den GB-A 1 353 708 ist es bekannt, für den Antrieb der Schneideinrichtung einen Druckluftantrieb zu verwenden, wobei der Druckluftantrieb auf eine Kniehebelanordnung einwirkt, die das Unterteil gegen das am Maschinenrahmen festgelegte Oberteil preßt. Die Kniehebelanordnung ist notwendig, um hier Kräfte ausüben zu können, die 9 t und mehr betragen können. Der Nachteil dieser Kniehebelanordnung besteht darin, daß diese einem relativ hohen Verschleiß unterliegt, daß die Öffnungsweite der Maschinenteile begrenzt ist, da unterhalb der Folie nicht genügend Platz für die Anordnung der komplizierten Mechanik ist. Darüberhinaus ist diese Konstruktion auch aufwendig und verschleißanfällig, da sie aus vielen Einzelteilen besteht.In packaging machines, it is known to produce the packaging from a lower and an upper film, with depressions being drawn into the lower and / or the upper film. The goods are then placed in the depressions of the bottom film and sealed to the finished packaging by means of the top film. Following this sealing process, the packs are then separated, which is done by means of a slitter and a cross cutter. When the packaging is cut crosswise, the two tool parts have to perform a relatively large stroke so that these tool parts can engage between the cup-shaped bottom film and possibly also the top film. If the top film is not deformed, the upper tool part is firmly connected to the machine frame and only the lower tool part is raised and lowered. If the upper film is deformed at the same time, the upper part must also be raised and lowered, this upper part then being locked firmly in the cutting position with the machine frame. From GB-A 1 353 708 it is known to use a compressed air drive for driving the cutting device, the compressed air drive acting on a toggle lever arrangement which presses the lower part against the upper part fixed to the machine frame. The toggle lever arrangement is necessary in order to be able to exert forces which can amount to 9 t and more. The disadvantage of this toggle lever arrangement is that it is subject to relatively high wear, that the opening width of the machine parts is limited, since there is not enough space below the film for the arrangement of the complicated mechanics. In addition, this construction is also complex and prone to wear, since it consists of many individual parts.

Bekannt ist es ferner, einen Hydraulikantrieb vorzusehen, mit dem die hohen Schneidkräfte wesentlich einfacher erzeugt werden können. Allerdings ist dieser Hydraulikantrieb insofern problematisch, weil bei seinem Einsatz beim Verpacken von Lebensmitteln oder von Waren aus dem Pharmaziebereich Bedenken bezüglich eines möglichen Ausströmens des Hydrauliköls bestehen. Darüberhinaus ist das Hydraulikaggregat auch aufwendig und teuer in der Herstellung und es ist ein zusätzliches Energiemedium notwendig, das nicht wie Druckluft sowieso vorhanden ist.It is also known to provide a hydraulic drive with which the high cutting forces can be generated much more easily. However, this hydraulic drive is problematic in that there are concerns about a possible leakage of the hydraulic oil when it is used in the packaging of food or goods from the pharmaceutical sector. In addition, the hydraulic unit is also complex and expensive to manufacture and an additional energy medium is required which is not available like compressed air anyway.

Der Erfindung liegt die Aufgabe zugrunde, einen Antrieb für Stanz-, Schneid- und Prägeeinrichtungen der eingangs genannten Art so auszubilden, daß diese mit einem im wesentlichen beliebig großen Öffnungsspalt herstellbar sind, daß diese mit einem geringen Druck beim Zusammenfahren der Werkzeugteile betrieben werden können, so daß auf zusätzliche Sicherheitseinrichtungen verzichtet werden kann, daß der Antrieb bei einem relativ geringen Bauvolumen einfach im Aufbau und wirtschaftlich in der Herstellung ist und mit diesem gleichzeitig die jeweils erforderliche Schließkraft und damit Schneid-, Präge- und Stanzkraft erzeugt werden kann.The invention is based on the object of designing a drive for punching, cutting and embossing devices of the type mentioned at the outset such that they can be produced with an essentially arbitrarily large opening gap so that they can be operated with a low pressure when the tool parts are moved together, so that additional safety devices can be dispensed with, that the drive is simple in construction and economical in production with a relatively small construction volume, and that the required clamping force and thus cutting, embossing and punching force can be generated at the same time.

Diese Aufgabe wird mit den Merkmalen des kennzeichnenden Teils des Anspruches I gelöst.This object is achieved with the features of the characterizing part of claim I.

Gemäß der Erfindung besteht somit der Druckluftantrieb für Stanz-, Schneid- und Prägeeinrichtungen aus zumindest einem Druckluftzylinder, der mit dem verfahrbaren Werkzeugteil verbunden ist. Die Kolbenstange des Druckluftzylinders ist mit einer weiteren Kolbenstange eines zweiten Druckluftspannelementes verbunden, das am Maschinenrahmen festlegbar ist. Sofern hier eine ebene Oberfolie verwendet wird, kann diese ständig fest mit dem Maschinengestell verbunden sein. Im anderen Fall muß dieses gleichfalls heb- und senkbar ausgebildet werden.According to the invention, the compressed air drive for punching, cutting and embossing devices thus consists of at least one compressed air cylinder which is connected to the movable tool part. The piston rod of the compressed air cylinder is connected to a further piston rod of a second compressed air clamping element, which can be fixed on the machine frame. If a flat top film is used here, it can be permanently connected to the machine frame. In the other case, this must also be designed to be raised and lowered.

Der Preßluftzylinder, der mit dem verfahrbaren Werkzeugteil verbunden ist, kann mit der erforderlichen Länge ausgebildet sein, so daß dieses Werkzeugteil den geforderten Öffnungsspalt für den Weitertransport der Verpackungen einnimmt. Dieser Preßluftzylinder kann mit einem relativ geringen Druck beaufschlagt werden, so daß die durch diesen ausgeübten Kraft unter 15 kp liegt, d.h. unter einer Kraft, bei der keinerlei Verletzungen zu befürchten sind und somit zusätzliche Sicherheitseinrichtungen überflüssig sind. Am Ende der Schließbewegung mittels des Druckluftzylinders wird die Kolbenstange mechanisch blockiert, wobei diese Blockiereinrichtung im Innern des Luftdruckzylinders integriert sein kann oder aber mittels eines Bolzens, der in eine Ausnehmung der Kolbenstange eingeschoben wird und somit diese relativ zum Zylinder festlegt. In dieser Schließstellung des unteren Werkzeugteils liegt das untere Werkzeugteil mit einer Anpreßkraft von weniger als 15 kp am Messer an. Im Anschluß hieran wird auf das Druckluftspannelement Preßluft gegeben, so daß die nunmehr verriegelte Kolbenstange mit großer Kraft beaufschlagt wird, die 9 t und mehr betragen kann und so das Messer gegen das Widerlager gedrückt wird, so daß die Folie zerteilt wird. Das Druckluftspannelement besteht aus mehreren hintereinandergeschalteten Kolbenzylindereinheiten, wodurch der Durchmesser des Druckluftspannelementes bei einer hohen Krafterzeugung relativ gering gehalten werden kann. Der Weg, den das Druckluftspannelement bewältigen muß, kann dann nur noch wenige mm betragen, was z.B. für das Zerschneiden einer Folie durchaus ausreichend ist. Dieser Weg kann jedoch auch auf Kosten der Bauhöhe vergrößert werden, um z.B. für Präge- und Stanzeinrichtungen ausreichend zu sein.The compressed air cylinder, which is connected to the movable tool part, can be designed with the required length, so that this tool part occupies the required opening gap for the further transport of the packaging. This compressed air cylinder can be subjected to a relatively low pressure, so that the force exerted by it is below 15 kp, i.e. under a force at which no injuries are to be feared and additional safety devices are therefore unnecessary. At the end of the closing movement by means of the compressed air cylinder, the piston rod is mechanically blocked, whereby this blocking device can be integrated inside the air pressure cylinder or by means of a bolt which is inserted into a recess in the piston rod and thus fixes it relative to the cylinder. In this closed position of the lower tool part, the lower tool part rests on the knife with a contact pressure of less than 15 kp. Subsequently, compressed air is added to the compressed air clamping element, so that the now locked piston rod is acted upon with great force, which can be 9 t and more, and so the knife is pressed against the abutment, so that the film is divided. The compressed air tensioning element consists of several piston cylinder units connected in series, whereby the diameter of the compressed air tensioning element can be kept relatively small with a high force generation. The path that the compressed air clamping element has to cover can then only be a few mm, which e.g. is sufficient for cutting a film. However, this path can also be increased at the expense of the overall height, e.g. to be sufficient for embossing and punching devices.

Vorteilhaft besteht das Druckluftspannelement aus mehreren ringförmig gegeneinander gepreßt gehaltenen Einzelteilen, die eine zentrale Bohrung aufweisen, durch die die Kolbenstange greift. Durch diese zentrale Bohrung greift des weiteren ein am Kolben angeordneter rohrförmiger Ansatz, wobei jeder Kolben sich auf den vorhergehenden und den nachfolgenden Kolben abstützt, so daß bei einem relativ kleinen Durchmesser bei mehreren hintereinander angeordneten Kolben sich eine hohe Druckkraft aufbauen läßt. Die Druckluftzuführungen und -abführungen werden in den ringförmigen Teilen durch Bohrungen erhalten, die diese durchsetzen und die nach der Montage übereinanderliegen. So ist es möglich, die Vielzahl hintereinander liegender Kolbeneinheiten mit zwei außen liegenden Druckluftanschlüssen zu versorgen.The compressed air tensioning element advantageously consists of a plurality of individual parts which are held in a ring and pressed against one another and have a central bore through which the piston rod engages. A tubular extension arranged on the piston engages through this central bore, wherein each piston is supported on the preceding and following pistons, so that with a relatively small diameter with a plurality of pistons arranged one behind the other, a high compressive force can be built up. The compressed air inlets and outlets are obtained in the ring-shaped parts through bores which penetrate them and which lie one above the other after assembly. This makes it possible to supply the large number of piston units one behind the other with two external compressed air connections.

Für ein Schneidwerkzeug, das für Verpackungsmaschinen eingesetzt werden soll, werden vorteilhaft zwei Antriebseinheiten verwendet, die zu beiden Seiten der Schneideinrichtung angeordnet sind, wobei die beiden Druckluftspannelemente über Platten miteinander verbunden sind, an denen das eine das Messer tragende Werkzeugteil befestigt ist.For a cutting tool that is to be used for packaging machines, two drive units are advantageously used, which are arranged on both sides of the cutting device, the two compressed air clamping elements being connected to one another via plates to which the one tool part carrying the knife is fastened.

Eine erfindungsgemäße Vorrichtung gestattet es somit, beliebig große Öffnungsspalten zwischen den beiden Werkzeugteilen herzustellen, die lediglich durch die Höhe des Maschinenrahmens begrenzt sind. Die erfindungsgemäße Vorrichtung besteht aus vergleichsweise wenig Einzelteilen, die kostengünstig herzustellen sind und somit zu einer sehr wirtschaftlichen Konstruktion führen, die verschleißfrei arbeitet und trotzdem die erforderlichen großen Anpreßdrucke liefert. Da darüberhinaus das Zusammenfahren der beiden Werkzeugteile mit einem relativ geringen Druck erfolgt, wird nicht nur eine Sicherheitseinrichtung eingespart, sondern auch der Luftverbrauch als solcher wird wesentlich verringert. Der eigentliche Arbeitshub, der mit einem hohen Luftdruck gefahren wird, ist somit auf das Mindestmaß beschränkt, so daß die Vorrichtung insgesamt sehr wirtschaftlich arbeitet.A device according to the invention thus allows opening gaps of any size to be produced between the two tool parts, which are only limited by the height of the machine frame. The device according to the invention consists of comparatively few individual parts which are inexpensive to manufacture and thus lead to a very economical construction which works without wear and yet delivers the required large contact pressures. In addition, since the two tool parts are moved together at a relatively low pressure, not only is a safety device saved, but the air consumption as such is also significantly reduced. The actual working stroke, which is carried out with a high air pressure, is thus limited to the minimum, so that the device as a whole works very economically.

Weitere vorteilhafte Ausgestaltungen der Erfindung gehen aus den Unteransprüchen in Verbindung mit Zeichnung und Beschreibung hervor, in dieser zeigen:

  • Fig. I einen Längsschnitt durch eine erfindungsgemäße Schneideinrichtung in einer Verpackungsvorrichtung,
  • Fig. 2 einen Schnitt nach Linie 11-11 in Fig. I,
  • Fig. 3 eine Draufsicht auf eine erfindungsgemäße Schneidvorrichtung,
  • Fig. 4 eine Detailansicht des Druckluftkraftspannelementes im Längsschnitt,
  • Fig. 5 eine Draufsicht auf das Spannelement nach Fig.4,
  • Fig. 6 eine Sperreinrichtung für die Festlegung der Kolbenstange des Luftdruckzylinders,
  • Fig. 7 undFig. 8 eine weitere Ausführungsform für das Fest-legen der Kolbenstange des Luftdruckzylinders.
Further advantageous embodiments of the invention emerge from the subclaims in conjunction with the drawing and description, in which:
  • I shows a longitudinal section through a cutting device according to the invention in a packaging device,
  • 2 shows a section along line 11-11 in Fig. I,
  • 3 is a plan view of a cutting device according to the invention,
  • 4 shows a detailed view of the compressed air force clamping element in longitudinal section,
  • 5 shows a plan view of the tensioning element according to FIG. 4,
  • 6 is a locking device for fixing the piston rod of the air pressure cylinder,
  • Fig. 7 and Fig. 8 shows a further embodiment for fixing the piston rod of the air pressure cylinder.

In den Figuren ist eine Schneideinrichtung 2 einer Verpackungseinrichtung I dargestellt, die ein oberes Werkzeugteil 3 aufweist, das das Messer 4 trägt, sowie ein unteres Werkzeugteil 5, das als Gegenlager für das Messer 4 dient.In the figures, a cutting device 2 of a packaging device I is shown, which has an upper tool part 3, which carries the knife 4, and a lower tool part 5, which serves as a counter bearing for the knife 4.

Fig.1 zeigt die Behälter 6 in Seitenansicht und im Schnitt, die aus einer Unterfolie 7, die napfartig verformt ist, und einer Oberfolie 8 gebildet werden. Ober- und Unterfolie sind in bekannter Art und Weise in einer vor der Schneidstation angeordneten Siegelstation miteinander verschweißt worden. Mittels der Schneideinrichtung 2 werden die Behälter 6 im Bereich des zwischen diesen ausgebildeten Zwischenraumes 9 in Querstellung getrennt.1 shows the containers 6 in side view and in section, which are formed from a lower film 7, which is deformed like a cup, and an upper film 8. The top and bottom films have been welded together in a known manner in a sealing station arranged in front of the cutting station. By means of the cutting device 2, the containers 6 are separated in the transverse position in the region of the intermediate space 9 formed between them.

Bei dem dargestellten Ausführungsbeispiel ist die Oberfolie 8 eben ausgebildet, so daß das obere Werkzeugteil 3 ortsfest mit dem Maschinenrahmen 10 verbunden werden kann.In the illustrated embodiment, the upper film 8 is flat, so that the upper tool part 3 can be connected to the machine frame 10 in a stationary manner.

An der Innenseite des Maschinenrahmens 10 sind, wie insbesondere aus den Fig. 2 und 3 zu ersehen ist, je zwei Führungsleisten 11 angeordnet, die Führungsprofile 12 aufnehmen, die eine den Führungsleisten II entsprechende Ausnehmung aufweisen. Diese Führungsprofile sind längs dem Maschinenrahmen 10 verstellbar, so daß in Abhängigkeit der jeweiligen Größen der Behälter 6 die Schneideinrichtung 2 entsprechend justiert werden kann. Zu diesem Zweck ist auf der Oberseite der Führungsleisten 11 eine Verzahnung 13 angebracht, in die ein am Maschinenrahmen 10 drehbar angeordnetes Zahnrad 14 eingreift. Die beiden Zahnräder, die jeweils in die Führungsleiste II auf den beiden Seiten der Folien 7, 8 eingreifen, sind über eine Achse 15 miteinander verbunden, so daß bei einer Verschiebung der Schneideinrichtung 2 ein Verkanten vermieden ist. Zur feinfühligen Verschiebung der Schneideinrichtung 2 ist an einer Seite auf der Achse 15, die auf der einen Seite seitlich über den Maschinenrahmen 10 übersteht, ein Handrad 16 drehfest befestigt.On the inside of the machine frame 10, as can be seen in particular from FIGS. 2 and 3, two guide strips 11 are arranged in each case, which receive guide profiles 12 which have a recess corresponding to the guide strips II. These guide profiles are adjustable along the machine frame 10 so that the cutting device 2 can be adjusted accordingly depending on the respective sizes of the containers 6. For this purpose, a toothing 13 is attached to the top of the guide strips 11, into which a gearwheel 14 rotatably arranged on the machine frame 10 engages. The two gear wheels, which each engage in the guide bar II on the two sides of the foils 7, 8, are connected to one another via an axis 15, so that tilting is avoided when the cutting device 2 is displaced. For the sensitive displacement of the cutting device 2, a handwheel 16 is fastened on one side on the axis 15, which projects laterally beyond the machine frame 10 on one side.

An den zu beiden Seiten am Maschinenrahmen 10 angeordneten Führungsprofilen sind die Kettenführungen 17, 18 für eine Endloskette angeordnet, die Klemmelemente 19 aufweisen, mit denen die Unterfolie 7 an den Rändern ergriffen und transportiert wird. Mit Hilfe dieser Ketten werden die Behälter taktweise weitertransportiert und jeweils in der entsprechenden Stellung der Schneideinrichtung 2 positioniert.On the guide profiles arranged on both sides of the machine frame 10, the chain guides 17, 18 for an endless chain are arranged, which have clamping elements 19 with which the bottom film 7 is gripped and transported at the edges. With the help of these chains, the containers are transported in cycles and positioned in the corresponding position of the cutting device 2.

Fest mit dem Führungsprofil 12 ist jeweils ein Druckluftspannelement 20 verbunden, das aus mehreren hintereinandergeschalteten Kolbenzylindereinheiten besteht und eine allen Kolbenzylindereinheiten gemeinsame Kolbenstange 21 aufweist. Jedes Druckluftspannelement 20 besitzt einen Sockel 22, der mit dem Führungsprofil 12 verschraubt ist. An diesem Sokkel 22 sind zwei die Druckluftspannelemente 20 miteinander verbindende Platten 23 befestigt, die somit über den Sokkel 22 ortsfest am Maschinengestell 10 festgelegt sind. Die Platten 23 sind parallel zueinander angeordnet und liegen hochkant, wie dies am besten aus Fig.l zu ersehen ist.A compressed air tensioning element 20, which consists of several piston cylinder units connected in series and has a piston rod 21 common to all piston cylinder units, is fixedly connected to the guide profile 12. Each compressed air clamping element 20 has a base 22 which is screwed to the guide profile 12. Two plates 23, which connect the compressed air tensioning elements 20 to one another, are fastened to this socket 22 and are thus fixed in place on the machine frame 10 via the socket 22. The plates 23 are arranged parallel to one another and lie on edge, as can best be seen from FIG. 1.

An ihrer Unterseite sind zwei das Messer 4 der Schneideinrichtung aufnehmende und tragende Platten 24, 25 mittels Schrauben 26 befestigt, die in seitlichen Ansätzen 27 der Platten 23 greifen.On their underside, two plates 24, 25 receiving and supporting the knife 4 of the cutting device are fastened by means of screws 26 which engage in lateral projections 27 of the plates 23.

Das untere Werkzeugteil 5 besteht aus einer sich über die Breite der Folien 6, 7 erstreckenden Platte, die an ihren beiden Seiten mit der Zylinderwandung 28 eines Druckluftzylinders 29 befestigt ist. Der Druckluftzylinder hat in bekannter Weise eine Kolbenstange 30 sowie einen am Ende der Kolbenstange 30 angeordneten Kolben 31. Der Druckluftzylinder ist doppelt wirkend ausgebildet, wobei die Kolbenstange 30 durch eine hermetisch dichtende Dichtung aus dem Zylinder austritt. Die Kolbenstange 30 ist in Verlängerung der Kolbenstange 21 des Druckluftspannelementes angeordnet und fest mit dieser mittels einer Schraube 32 verbunden.The lower tool part 5 consists of a plate which extends over the width of the foils 6, 7 and is fastened on both sides to the cylinder wall 28 of a compressed air cylinder 29. The compressed air cylinder has a piston rod 30 and a piston at the end in a known manner ben rod 30 arranged piston 31. The compressed air cylinder is double-acting, the piston rod 30 exiting the cylinder through a hermetically sealing seal. The piston rod 30 is arranged in the extension of the piston rod 21 of the compressed air clamping element and is fixedly connected to it by means of a screw 32.

In den Fig. und 2 ist jeweils in der linken Hälfte der Zeichnung das untere Werkzeugteil in angehobener, d.h. in Schneidstellung dargestellt und in der rechten Hälfte der Zeichnung in abgesenkter Stellung, d.h. in der Stellung, in der die Behälter 6 in die Schneideinrichtung hinein bzw. wieder aus dieser heraustransportiert werden können. Wie aus Fig. 2 zu ersehen ist, ist das Messer 4 etwas schmaler als die Breite der Unterfolie ausgebildet, so daß die Verpackungen an den Rändern noch weiter zusammenhängen und somit auch weiter mittels der Ketten transportiert werden können. Bei einer Betätigung des Druckluftzylinder behält der Kolben 31 relativ zum Maschinenrahmen seine Lage bei, während der Zylinder relativ zum Maschinenrahmen und damit das untere Werkzeugteil 5 nach unten abgesenkt wird.2 and 2, the lower tool part is in the left half of the drawing in a raised, i.e. shown in the cutting position and in the right half of the drawing in the lowered position, i.e. in the position in which the containers 6 can be transported into and out of the cutting device. As can be seen from Fig. 2, the knife 4 is somewhat narrower than the width of the bottom film, so that the packaging is still connected at the edges and can therefore be transported further by means of the chains. When the compressed air cylinder is actuated, the piston 31 maintains its position relative to the machine frame, while the cylinder is lowered relative to the machine frame and thus the lower tool part 5.

Die Länge des Druckluftzylinde 29 kann beliebig groß gewählt werden, so daß hier ein beliebig großer Offnungsspalt für das Transportieren der Behälter 6 erhalten werden kann. Die Druckluftzylinde 29 - werden vorteilhaft mit einem relativ geringen Druck beaufschlagt, was zum einen den Druckluftverbrauch reduziert und zum anderen zur Folge hat, daß die Schließkraft der Druckluftzylinderkolben kleiner als 15 kp gehalten werden kann. Es ist hierdurch möglich, besondere Sicherheitseinrichtungen einzusparen, denn selbst wenn die Hand einer Bedienungsperson beim Schließvorgang zwischen Unter- und Oberwerkzeug gerät, kann hier kein Schaden entstehen.The length of the compressed air cylinder 29 can be chosen to be of any size, so that an opening gap of any size can be obtained for the transport of the containers 6. The compressed air cylinder 29 - are advantageously subjected to a relatively low pressure, which on the one hand reduces the compressed air consumption and on the other hand has the consequence that the closing force of the compressed air cylinder piston can be kept less than 15 kp. This makes it possible to save on special safety devices, because even if an operator's hand gets between the upper and lower tools during the closing process, no damage can occur here.

In den Fig. 6 bis 8 sind die unteren Enden zweier verschiedener Ausführungsformen der Druckluftzylinderkolben dargestellt. Bei dem in Fig. 6 gezeigten Ausführungsbeispiel, das wiederum in der linken Hälfte der Zeichnung die eingefahrene und in der rechten Hälfte der Zeichnung die ausgefahrene Stellung zeigt, wird die Kolbenstange 30 selbsttätig in ihrer unteren Endstellung, d.h. in der zusammengefahrenen Stellung der beiden Werkzeugteile, verriegelt. Dies erfolgt über einen Ring 33, der in eine Nute 34 der Kolbenstange 30 eingreift. Im Endblock 35 des Druckluftzylinders 29 ist eine Hülse 36 verschiebbar angeordnet, die mit einer Feder 37 zusammenwirkt. Wenn im Zylinderraum 38 kein Druck herrscht, so drückt die Feder 37 die Hülse 36 nach oben, so daß der Ring 33 in der Nut 34 des Kolbens 30 gehalten wird. In dieser Stellung des Ringes 33 ist die Kolbenstange 30 relativ zur Zylinderwandung 28 verriegelt und damit auch gleichzeitig das untere Werkzeugteil 5. Trotz des geringen Druckes, mit dem der Druckluftzylinder 29 betrieben wird, kann somit dann über das Druckluftspannelement 20 eine hohe Schneidkraft aufgebaut werden. Für die Entriegelung von Kolbenstange 30 dient eine im Widerlagerteil 39 angeordnete Bohrung 40, durch die Druckluft auf die Hülse 36 einwirkt, so daß die Feder 37 zusammengedrückt wird, wie dies in der rechten Hälfte der Fig. 6 dargestellt ist. In dieser Stellung gleitet der Ring 33 aus der Nut 34 hinaus, so daß das Werkzeugunterteil 5 abgesenkt werden kann.6 to 8, the lower ends of two different embodiments of the air cylinder piston are shown. In the embodiment shown in Fig. 6, which again shows the retracted position in the left half of the drawing and the extended position in the right half of the drawing, the piston rod 30 is automatically in its lower end position, i.e. locked in the closed position of the two tool parts. This is done via a ring 33 which engages in a groove 34 of the piston rod 30. In the end block 35 of the compressed air cylinder 29, a sleeve 36 is slidably arranged, which cooperates with a spring 37. If there is no pressure in the cylinder space 38, the spring 37 presses the sleeve 36 upward, so that the ring 33 is held in the groove 34 of the piston 30. In this position of the ring 33, the piston rod 30 is locked relative to the cylinder wall 28 and thus at the same time the lower tool part 5. Despite the low pressure with which the compressed air cylinder 29 is operated, a high cutting force can then be built up via the compressed air clamping element 20. For the unlocking of the piston rod 30 is a bore 40 arranged in the abutment part 39, through which compressed air acts on the sleeve 36, so that the spring 37 is compressed, as shown in the right half of FIG. 6. In this position, the ring 33 slides out of the groove 34 so that the lower tool part 5 can be lowered.

In den Fig. 7 und 8 ist eine andere Ausführungsform einer Verriegelung der Kolbenstange 30 dargestellt, und zwar ist hier am Ende der Kolbenstange 30 ein Auge 41 mit einer Bohrung 42 angeordnet, in das ein Bolzen 43 einschiebbar ist, der von einem weiteren Druckluftzylinder 44 betätigbar ist. In der angehobenen Stellung des unteren Werkzeugteiles 5 , d.h. in der Stellung, in der die eigentliche Schneidkraft aufgebaut werden kann, wird die Kolbenstange 30 durch Einschieben des Bolzens 43 gegenüber der Zylinderwandung 28 verriegelt, so daß nunmehr das Werkzeugunterteil 5 mit der Kolbenstange 30 starr verbunden ist.7 and 8, another embodiment of a locking of the piston rod 30 is shown, namely here an eye 41 with a bore 42 is arranged at the end of the piston rod 30, into which a bolt 43 can be inserted, which is connected by a further compressed air cylinder 44 can be actuated. In the raised position of the lower tool part 5, i.e. in the position in which the actual cutting force can be built up, the piston rod 30 is locked against the cylinder wall 28 by inserting the bolt 43, so that the lower tool part 5 is now rigidly connected to the piston rod 30.

Das Druckluftspannelement 20 ist in den Fig. 4 und 5 in vergrößerter Darstellung dargestellt. Das Druckluftspannelement besteht aus einem Sockel 22, auf dem eine Vielzahl von gleich ausgebildeten Ringelementen 45 aufgesetzt ist, im Ausführungsbeispiel sind dies sieben Stück. Jedes Ringelement weist eine mittige Bohrung 46 sowie eine an einer Seite angeordnete Ausnehmung 47 sowie zwei durchgehende Bohrungen 48, 49 auf. Von diesen durchgehenden Bohrungen 48, 49 zweigen Kanäle 50, 51 ab, die zur Druckluftzuführung zu je einer Seite des ringförmigen Teiles 45 dienen.The compressed air clamping element 20 is shown in FIGS. 4 and 5 in an enlarged view. The compressed air clamping element consists of a base 22 on which a plurality of ring elements 45 of the same design are placed, in the exemplary embodiment these are seven pieces. Each ring element has a central bore 46 and a recess 47 arranged on one side and two through bores 48, 49. From these through bores 48, 49 branch off channels 50, 51, which are used to supply compressed air to one side of the annular part 45.

Die mittige Bohrung 46 ist so groß ausgebildet, daß diese zum einen zur Aufnahme der Kolbenstange 21 und zum anderen zur Aufnahme einer ringförmigen Buchse 52 eines Kolbens 53 dient. Der Kolben weist an seiner Innenseite im Bereich der Buchse 52 eine O-Ring-Dichtung 54 auf, die den Kolben gegenüber der Kolbenstange 21 abdichtet. Im ringförmigen Teil 45 sind des weiteren an den parallel zur Kolbenstange liegenden Flächen zwei weitere O-Ring-Dichtungen 55, 56 angeordnet, die zur Abdichtung des ringförmigen Teils gegenüber dem Kolben bzw. der Buchse des Kolbens dienen. Sämtliche Kolben 53 stützen sich über ihre Buchsen 52 gegeneinander ab, so daß sich die Kraft der einzelnen Kolbenzylindereinheiten addiert, so daß bei einem relativ geringen Durchmesser durch Wahl der Anzahl der Kolbenzylindereinheiten sehr hohe Kräfte aufgebaut werden können. Der Durchmesser jeder Kolbenzylindereinheit wird vorteilhaft so gewählt, daß dieser eine Druckkraft von etwa 600 kp bei einem Druck von 6 bar liefert. Im gezeichneten Ausführungsbeispiel liefert also jedes Druckluftspannelement ca. 4,2 t, so daß insgesamt eine Anpreßkraft des Messers 4 auf das untere Werkzeugteil 5 von etwas über 8 t erhalten wird.The central bore 46 is so large that it serves on the one hand for receiving the piston rod 21 and on the other hand for receiving an annular bushing 52 of a piston 53. The inside of the piston in the area of the bushing 52 has an O-ring seal 54 which seals the piston against the piston rod 21. In the annular part 45, two further O-ring seals 55, 56 are also arranged on the surfaces lying parallel to the piston rod, which serve to seal the annular part from the piston or the bushing of the piston. All pistons 53 are supported against one another via their bushes 52, so that the force of the individual piston-cylinder units is added, so that, with a relatively small diameter, very high forces can be built up by selecting the number of piston-cylinder units. The diameter of each piston-cylinder unit is advantageously chosen so that it delivers a pressure force of approximately 600 kp at a pressure of 6 bar. In the exemplary embodiment shown, each compressed air clamping element thus delivers approximately 4.2 t, so that a total contact pressure of the knife 4 on the lower tool part 5 of slightly over 8 t is obtained.

Da der große Öffnungsspalt für den Abtransport der Behälter 6 durch die mit dem unteren Werkzeugteil verbundenen Druckluftzylinder erreicht wird, braucht der Weg, den das Druckluftspannelement 20 liefert, nur noch sehr gering zu sein. Für Schneideinrichtungen für Verpackungsmaschinen hat sich ein Weg von 3 mm als durchaus ausreichend erwiesen, so daß mit dem erfindungsgemäßen Druckluftspanngerät bei einem vergleichsweise geringen Durchmesser und vergleichsweise geringer Bauhöhe sehr hohe Druckkräfte erzeugt werden können, die für das Durchtrennen von Folien benötigt werden.Since the large opening gap for the removal of the containers 6 is achieved by the compressed air cylinders connected to the lower tool part, the path provided by the compressed air clamping element 20 need only be very small. For cutting devices for packaging machines, a path of 3 mm has proven to be quite sufficient, so that with the compressed air tensioning device according to the invention, very high compressive forces are generated with a comparatively small diameter and comparatively low overall height can be used for cutting foils.

Das Druckluftspannelement zeichnet sich darüberhinaus durch große Einfachheit in seinem Aufbau aus, da dieses im wesentlichen aus gleichen ringförmigen Elementen und Kolben besteht, die je nach der erforderlichen Druckkraft in beliebiger Anzahl aufeinandergeschichtet werden und dann mittels Spannschrauben 57 auf den Muttern 58 aufgeschraubt sind, miteinander verspannt werden. Für sämtliche Kolbenzylindereinheiten sind lediglich zwei Druckluftanschlüsse 59, 60 erforderlich, und zwar für doppelt wirkende Zylinder. Jedes ringförmige Element 45 ist somit gleich ausgebildet, wobei diese ringförmigen Elemente zwischen dem Block 22 und einem Endstück 61 zusammengepreßt sind, das im Grunde genommen gleich den ringförmigen Elementen 45 ausgebildet sein kann, bei dem jedoch auf die Bohrung 49 verzichtet werden kann.The compressed air clamping element is also characterized by great simplicity in its construction, since it consists essentially of the same annular elements and pistons, which are stacked on one another in any number depending on the required compressive force and then screwed onto the nuts 58 by means of clamping screws 57 will. Only two compressed air connections 59, 60 are required for all piston-cylinder units, specifically for double-acting cylinders. Each ring-shaped element 45 is thus of identical design, these ring-shaped elements being pressed together between the block 22 and an end piece 61, which can basically be designed in the same way as the ring-shaped elements 45, but without the bore 49.

Die Kolbenstange 21 des Druckluftspannelementes 20 ist durch das Druckluftspannelement hindurchgeführt und an ihrem Ende mit Gewinde 63 versehen, auf das zur Festlegung der Kolbenstange 21 am Druckluftspannelement zwei Schrauben 64 aufgeschraubt sind. Hierdurch wird eine einfache Montage und Demontage des Spannelementes ermöglicht, das vollständig montiert an der Schneideinrichtung 2 angebaut bzw. abgebaut werden kann.The piston rod 21 of the compressed air clamping element 20 is passed through the compressed air clamping element and provided at its end with thread 63, onto which two screws 64 are screwed to fix the piston rod 21 on the compressed air clamping element. This enables simple assembly and disassembly of the clamping element, which can be attached or detached completely assembled to the cutting device 2.

Claims (13)

1. A pneumatic drive for punching, cutting and stamping devices, having two tool parts (3, 5) which are conveyable towards one another and of which one is, at least in the operating position, advantageously securely connected to the machine frame (10), being particularly for cutting devices (2) for packaging machines (1) with a large width of opening, characterized in that the cylinder wall of a compressed-air cylinder (29) is secured to the displaceable tool part (5), in that the piston rod (30) of the compressed-air cylinder (29) is constructed so it can, in at least one end position, be locked to the cylinder wall, in that the piston rod (21) of a pneumatic stressing element (20) is secured to the piston rod (30) emerging from the compressed;, air cylinder, the cylinder of this pneumatic stressing element being securable or being fixedly arranged and being composed of at least two successively connected piston cylinder units with a common piston rod (21).
2. A pneumatic drive in accordance with Claim 1, characterized in that the pneumatic stressing element (20) has a cylinder constructed of annular component parts (45) which are maintained pressed against each other and each have a central bore (46) to receive the piston rod (21) and in each case the tubular part of one of the freely displaceable pistons (53, 54) supported against each other, and each have a recess to receive the piston (53).
3. A pneumatic drive in accordance with Claim 2, characterized in that each piston (53) is composed of an annular part with a bore, and a tubular sleeve (52) inserted into the bore.
4. A pneumatic drive in accordance with Claim 3, chracterized in that the piston (53) and the tubular sleeve (52) are constructed as one piece.
5. A pneumatic drive in accordance with any one of Claims 2 to 4, characterized in that each piston (53) is sealed in relation to the piston rod (21) through an O-ring seal inserted into the inner bore of the piston.
6. A pneumatic drive in accordance with any one of Claims 3 to 5, characterized in that an O-ring seal (55, 56) is inserted into each of the inner surfaces, which are offset in a step-like manner, of the annular part (45) forming the cylinder, this O-ring seal cooperating with the end faces of the piston (53) and its tubular sleeve (52).
7. A pneumatic drive in accordance with any one of Claims 2 to 6, characterized in that a through-going bore (48. 49) for stressing the two sides of the piston with compressed air is constructed in each ring element (45), which bores each form a throughgoing channel after fitting of the ring elements (45).
8. A pneumatic drive in accordance with any one of Claims 1 to 7, characterized in that at least two pneumatic drives for operating a cutting device (2) are foreseen, and in that the two pneumatic stressing elements (20) are rigidly connected to each other.
9. A pneumatic drive in accordance with Claim 8, characterized in that the compressed-air cylinders (29) connected to the displaceable tool part (5) are designed for a considerably greater lift than the pneumatic stressing elements (20) and are stressed with a relatively lower pressure so that there results a closing load of less than 15 kg.
10 A pneumatic drive in accordance with Claim 8 Or 9, characterized in that the pnuematic stressing elements have a relatively small cylinder volume and a lift of approximately 3 mm., and in that the cylinders of the subsequently connected piston surfaces are dimensioned in such a manner that at a pressure of approximately 6 bar, a compressive force of approximately 600 kp per piston unit is obtained.
11. A pneumatic drive in accordance with any of Claims 1 to 9, characterized in that the locking device for locking the piston rod (30) of the compressed-air cylinders (29) is integrated in the compressed-air cylinder.
12. A pneumatic drive in accordance with any one of Claims 1 to 10, characterized in that the piston rod (30) has a bore (42) into which a bolt (43) guided in the cylinder can be pushed.
13. A pnueumatic drive in accordance with Claim 12, characterized in that the bolt (43) is operated by a further compressed-air cylinder (44).
EP87107223A 1986-06-12 1987-05-19 Pneumatic drive for a punching, cutting and stamping device Expired - Lifetime EP0249059B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87107223T ATE50722T1 (en) 1986-06-12 1987-05-19 COMPRESSED AIR DRIVE FOR PUNCHING, CUTTING AND EMBOSSING EQUIPMENT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3619811 1986-06-12
DE19863619811 DE3619811A1 (en) 1986-06-12 1986-06-12 COMPRESSED AIR DRIVE FOR PUNCHING, CUTTING AND MAINTENANCE DEVICES

Publications (2)

Publication Number Publication Date
EP0249059A1 EP0249059A1 (en) 1987-12-16
EP0249059B1 true EP0249059B1 (en) 1990-03-07

Family

ID=6302884

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87107223A Expired - Lifetime EP0249059B1 (en) 1986-06-12 1987-05-19 Pneumatic drive for a punching, cutting and stamping device

Country Status (5)

Country Link
US (1) US4798115A (en)
EP (1) EP0249059B1 (en)
JP (1) JPS62292395A (en)
AT (1) ATE50722T1 (en)
DE (2) DE3619811A1 (en)

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DE3619811A1 (en) * 1986-06-12 1987-12-17 Kraemer & Grebe Kg COMPRESSED AIR DRIVE FOR PUNCHING, CUTTING AND MAINTENANCE DEVICES
DE4216207C1 (en) * 1992-05-15 1993-08-19 Multivac Sepp Haggenmueller Kg, 8941 Wolfertschwenden, De
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DE102012000127A1 (en) 2012-01-06 2013-07-11 Gea Cfs Germany Gmbh Packaging machine with a cutting station
DE102012224532A1 (en) * 2012-12-28 2014-07-03 Sms Siemag Ag Ride-on hydraulic scissors without stand
ES2779853T3 (en) 2017-07-14 2020-08-20 Multivac Sepp Haggenmüller Se & Co Kg Deep Drawing Packaging Machine with Flexible Package Holder
CN110076829B (en) * 2019-05-24 2021-04-13 深圳市中怡医卫新材料有限公司 Device for cutting cotton swab leftover materials
CN112440328B (en) * 2020-09-14 2022-06-10 佛山华兴塑料制品有限公司 Piston L type automatic molding machine

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DE3619811A1 (en) * 1986-06-12 1987-12-17 Kraemer & Grebe Kg COMPRESSED AIR DRIVE FOR PUNCHING, CUTTING AND MAINTENANCE DEVICES

Also Published As

Publication number Publication date
DE3761802D1 (en) 1990-04-12
DE3619811A1 (en) 1987-12-17
JPS62292395A (en) 1987-12-19
EP0249059A1 (en) 1987-12-16
ATE50722T1 (en) 1990-03-15
US4798115A (en) 1989-01-17

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