WO2012160077A1 - Device with double-lever actuation for welding of packages, for packaging machines - Google Patents

Device with double-lever actuation for welding of packages, for packaging machines Download PDF

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Publication number
WO2012160077A1
WO2012160077A1 PCT/EP2012/059556 EP2012059556W WO2012160077A1 WO 2012160077 A1 WO2012160077 A1 WO 2012160077A1 EP 2012059556 W EP2012059556 W EP 2012059556W WO 2012160077 A1 WO2012160077 A1 WO 2012160077A1
Authority
WO
WIPO (PCT)
Prior art keywords
support
levers
welding
bars
packages
Prior art date
Application number
PCT/EP2012/059556
Other languages
French (fr)
Inventor
Gianluigi Rossi
Original Assignee
Gianluigi Rossi
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gianluigi Rossi filed Critical Gianluigi Rossi
Publication of WO2012160077A1 publication Critical patent/WO2012160077A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/001—Joining in special atmospheres
    • B29C66/0012—Joining in special atmospheres characterised by the type of environment
    • B29C66/0014—Gaseous environments
    • B29C66/00145—Vacuum, e.g. partial vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
    • B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8225—Crank mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8226—Cam mechanisms; Wedges; Eccentric mechanisms
    • B29C66/82263—Follower pin or roller cooperating with a groove
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/849—Packaging machines
    • 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
    • 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
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/26—Devices specially adapted for producing transverse or longitudinal seams in webs or tubes
    • B65B51/30—Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes
    • B65B51/303—Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes reciprocating along only one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/745—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using a single unit having both a severing tool and a welding tool
    • B29C65/7451—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using a single unit having both a severing tool and a welding tool the severing tool and the welding tool being movable with respect to one-another
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81422—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being convex
    • 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
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • B65B9/2042—Means for altering the cross-section of the tube filling opening prior to transversal sealing, e.g. tube spreading devices

Definitions

  • TITLE Device with double-lever actuation for welding of packages, for packaging machines
  • the present invention relates to a device for welding o f packages for packaging machines , which can also be used in a process for production o f packages under vacuum, and therefore also in machines which are provided with tanks or chambers for the vacuum.
  • packaging machines can be horizontal or vertical, o f a manual or automatic type, and are used to obtain finished packs of bulk products .
  • automatic packaging machines a certain quantity o f bulk pro duct is introduced into a ho llow tubular element which provides the form o f the package to be obtained.
  • a film made o f p lastic material which is drawn downwards, and is subj ected to longitudinal welding by means o f welding means .
  • the film which will form the pack o f product must b e welded in a transverse direction, in order to close the top and bottom o f the packs .
  • each package In machines which are under vacuum, at the exit from the tubular forming element each package must be introduced into a tank or chamber for the vacuum.
  • devices Downstream from the tubular forming element, devices are provided for transverse welding o f the top and bottom o f the p acks , and for separation o f them. These devices can have very large dimensions, they may have a low level o f efficiency, and they require complicated actuating means for movement o f the welding heads , including in the case o f application o f these devices to the machines which are under vacuum, in which it is necessary to guarantee the air tightness o f the tank or chamber for the vacuum.
  • the obj ect o f the present invention is thus to provide a device for welding o f packages for packaging machines , which, by means of the use of a single actuating motor, makes it possible to transform the rotary motion of this motor into alternating linear motion o f the welding bars, such as to move them away and bring them clo ser, optionally also at a variable speed. Thanks to double-lever actuating means, this device is particularly compact and efficient, and can be used with major structural advantages also inside tanks or chambers for the vacuum of packaging machines which are under vacuum.
  • FIG. 1 illustrates a first view in lateral elevation of a first embodiment of a device for welding of packages for packaging machines, which, according to the present invention, is provided with double-lever actuating means, and is in a first, open position with the welding bars at the maximum distance from one another;
  • FIG. 1 illustrates a view from above of the present device in Figure 1, in the open position
  • FIG. 3 illustrates a second view in lateral elevation of the first embodiment of the present device, in a completely closed position, and with a minimum distance or gap between the welding bars;
  • FIG. 4 illustrates a view from above of the present device in Figure 3, in the closed position
  • FIG. 5 illustrates a first view from above of a second embodiment of the present welding device provided with double-lever actuating means, and in a first open position with the welding bars at the maximum distance from one another;
  • FIG. 6 illustrates a view in lateral elevation of the double-lever actuating means of the present device in Figure 1, in the position in Figure 5;
  • FIG. 7 illustrates a second view from above of the second embodiment of the present device, in a second, closed position, with the welding bars at the minimum distance from one another;
  • FIG. 8 illustrates a view in lateral elevation of the double-lever actuating means of the present device in Figure 7 in the closed position in Figure 7.
  • 15 indicates a chamber for the vacuum of a packaging machine which is under vacuum, for example a device for the production of packages under vacuum such as that described in patent application GE2011 A000006 which belongs to the holder of the present application.
  • This chamber 15 for the vacuum which is illustrated partially and schematically, comprises a lower container 16, which for example has a rectangular form, and an upper box-shaped frame 17.
  • This frame 17 is provided in its upper part with a first opening 18, which can be closed hermetically by a sliding cover 19, and it is provided in its lower part with a second opening 20 for the passage of the packages to the lower container 16, which is provided with means, not illustrated, which can create the vacuum inside the chamber 15, and therefore put each package under vacuum.
  • Each of the packages which reaches the chamber 1 for the vacuum see for example the package P which is illustrated in Figure 2, is welded completely at the bottom, whereas at the top it has been welded partly.
  • the final welding of the top of each of the packages is carried out by means of two welding bars 5 and 5', which are aligned transversely and are opposite one another.
  • a device for transmission of motion comprising a support structure 1 for two pairs of parallel horizontal guides 2 and 2'.
  • This support structure 1 is entirely contained inside the chamber 15 for the vacuum.
  • a pair of slides or runners 3 and 3' slide on the guides 2 and 2'.
  • Each of these runners 3 and 3' is substantially a rectangular plate which is provided with four through holes, see for example the through hole 103, in which the two pairs of guides 2 and 2' are inserted.
  • the runner 3 and the runner 3' positioned on each guide 2 and 2' translate simultaneously and in directions opposite to one another, then they are moved away from one another, or are brought closer to one another.
  • the runner 3' which, looking at the Figures is disposed on the right-hand side of the device, is in a specular position, relative to a median plane M of the device, in relation to the runner 3 which is placed on the left-hand side.
  • the runner 3' which is situated on the right-hand side supports a first plate 4', substantially in the form of an "L”, which is placed in a specular position, relative to the median plane M, in relation to a second plate 4, which is substantially in the form of an "L”, and is supported by the runner 3 which is situated on the left-hand side of the device.
  • Each of these plates 4 and 4' supports respectively one of the said welding bars 5 and 5', which must be translated in one direction or the other.
  • Each of the slides 3 and 3' is connected by means of a small plate 6 and 6' provided with a corresponding pin 7 and 7' to a first final part of a corresponding arched lever: the pin 7 is connected to the free final first part 108 of a first arched lever 8, whereas the pin 7' is connected to a free final first part 108' of a second arched lever 8'.
  • These final first parts 108 and 108' of the arched levers are in diametrically opposite positions.
  • These arched levers 8 and 8' can have the form of an arc of a circumference, an arc of an ellipse or the like, and they are preferably the same.
  • Each of these arched levers 8 and 8' comprises a second final part 208 and 208' which is connected to a support plate 9, in this case with a circular form.
  • the second final part 208 of the arched lever 8 is connected to this plate 9 by means of a pin 10, around which this lever 8 can rotate, whereas the second final part 208' of the arched lever 8' is connected to the plate 9 by means of a pin 10' around which this lever 8' can rotate.
  • the pins 10 and 10' and therefore the final parts 208 and 208' of the levers 8 and 8' are located in the vicinity of the periphery of the said plate 9, and in diametrically opposite positions relative to the plate.
  • This support plate 9 is connected centrally to the shaft 11 of an electric motor 12, which is secured to a wall of the box-shaped frame 17 of the chamber or tank 15 for the vacuum.
  • the present device is illustrated in the open position, in other words with the welding bars 5 and 5' at the maximum distance L from one another, and therefore in this situation the package P can easily pass through the free space left between the said bars 5 and 5'.
  • the present device is illustrated in the closed position, in other words with the welding bars 5 and 5' at the minimum distance from one another.
  • a device for production of packages under vacuum such as that described in patent application GE2011 A000006 belonging to the holder of the present application
  • these bars 5 and 5' complete the welding of the top of the package P in the preceding Figures.
  • this package reaches the chamber 15 for the vacuum with the bottom completely welded and with the top partially welded, and it is suitably positioned inside the lower container 16 of the said chamber 15.
  • the cover 19 hermetically closes this chamber 15 for the vacuum.
  • the two welding bars 5 and 5' can pass at the required speed from the open position to the closed position, and vice versa.
  • the motor 12 is actuated such that the shaft 11 makes the plate 9 rotate by approximately 90° in the direction of the arrow R in Figure 1.
  • the arched levers 8 and 8' there is also synchronous rotation of the arched levers 8 and 8' around the respective rotation pins 10 and 10', in the direction opposite that of the direction R of the support plate 9.
  • the angle of rotation which is imparted by the motor 12 to the plate 9 can be other than 90°.
  • the speed of bringing closer and moving away of the welding bars 5 and 5' is variable for the same speed of rotation of the motor 12, and in particular the speed of initial bringing closer, as well as that of final moving away in the opposite phase, of these two bars 5 and 5', is high, whereas when the bars are at a sufficiently close distance, there is distinct slowing down of their bringing closer, until the situation of minimum distance in Figures 3 and 4 is reached. Consequently these bars 5 and 5' are brought quickly closer to the package edges to be welded, whereas when these bars reach the vicinity of the said edges and come into contact with them, they will undergo distinct deceleration, so as to have adequate time to carry out the welding.
  • these bars 5 and 5' will have substantially a first, relatively slow phase of detachment from the edges of the package, and a second, relatively fast phase of moving away from one another, such as to allow the package to pass through the bars which are once more in the open position, as in Figures 1 and 2.
  • FIGs 5 and 6 illustrate a second embodiment of the present device applied to automatic packaging machines for production of packages, which device is not under vacuum, and comprises a support structure 21 in which the two horizontal and parallel guides 2 and 2' are provided.
  • each package P which is obtained from a tubular forming element, not illustrated, must be welded transversely to the top and bottom, and also the packages in sequence must be separated from one another.
  • the support structure 21 is provided with a central aperture 23 for the passage of each package P.
  • the plates 4 and 4' support double welding bars 22 and 22'.
  • the bar 22 comprises an upper 122 and lower 222 welding head between which there is provided a seat 322 for accommodation of a tool, not illustrated, for cutting and separation of one package from another in the packaging process.
  • This cutting tool will be provided with corresponding actuators which allow it alternately to exit from the said seat 322 and return into it.
  • the bar 22' also comprises two welding heads 122' and 222', which are aligned transversely to the heads 122 and 222 of the bar 22. Between these heads there is provided a seat 322' in which there is accommodated a counter-blade, not illustrated, which can co-operate with the cutting tool which emerges from the seat 322 of the bar 22.
  • the double-lever actuating means of these bars 22 and 22' are altogether similar to those described for the first embodiment of the device, and therefore the same numbers correspond to the same elements as those described in Figures 1 - 4.
  • an element 24 and 24' for support of a device for folding the edges of plastic material film of two opposite sides of the top or bottom of the package, and preferably the two short sides of the package.
  • This folding device comprises two folding plates 25 and 25' which can be brought closer to one another and moved away from one another in the longitudinal direction, i.e. in the direction at right-angles to the transverse direction of alternate sliding of the bars 22 and 22' along the guides 2 and 2'.
  • Each of the two plates 25 and 25' is provided with a suitably pointed end in order to fold the edges of the top or bottom of the package P, and a pin 26 and 26' is positioned on the plates.
  • This pin 26 and 26' is accommodated inside a cam track 27 and 27' which is connected to the respective support element 24 and 24'.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)

Abstract

Device for welding of packages, for packaging machines, comprising at least one pair of welding bars (5, 5') which face one another and are each connected to a corresponding suitably shaped actuating lever (8, 8'); each of these levers (8, 8') is connected firstly and in a rotatable manner to a support (9) which can be rotated by means of suitable actuating means (11), and secondly it is connected to a corresponding welding bar (5, 5') which can be moved in one direction or the other on suitable sliding guides (2, 2); the rotary motion of the support (9) is transformed into synchronous rotary motion of each of these levers (8, 8') and thus into alternating linear motion of these welding bars (5, 5').

Description

TITLE : Device with double-lever actuation for welding of packages, for packaging machines
DE SCRIPTION
Background and summary of the invention
The present invention relates to a device for welding o f packages for packaging machines , which can also be used in a process for production o f packages under vacuum, and therefore also in machines which are provided with tanks or chambers for the vacuum.
As is known, packaging machines can be horizontal or vertical, o f a manual or automatic type, and are used to obtain finished packs of bulk products . In automatic packaging machines , a certain quantity o f bulk pro duct is introduced into a ho llow tubular element which provides the form o f the package to be obtained. Around this tubular element there is wound a film made o f p lastic material which is drawn downwards, and is subj ected to longitudinal welding by means o f welding means . When this longitudinal welding has been comp leted, the film which will form the pack o f product must b e welded in a transverse direction, in order to close the top and bottom o f the packs . In machines which are under vacuum, at the exit from the tubular forming element each package must be introduced into a tank or chamber for the vacuum.
Downstream from the tubular forming element, devices are provided for transverse welding o f the top and bottom o f the p acks , and for separation o f them. These devices can have very large dimensions, they may have a low level o f efficiency, and they require complicated actuating means for movement o f the welding heads , including in the case o f application o f these devices to the machines which are under vacuum, in which it is necessary to guarantee the air tightness o f the tank or chamber for the vacuum.
The obj ect o f the present invention is thus to provide a device for welding o f packages for packaging machines , which, by means of the use of a single actuating motor, makes it possible to transform the rotary motion of this motor into alternating linear motion o f the welding bars, such as to move them away and bring them clo ser, optionally also at a variable speed. Thanks to double-lever actuating means, this device is particularly compact and efficient, and can be used with major structural advantages also inside tanks or chambers for the vacuum of packaging machines which are under vacuum.
This object is achieved by the present invention by means of a device for welding of packages for packaging machines according to Claim 1.
Brief description of the drawings
Other advantageous characteristics of the present device for welding of packages for packaging machines are the subject of the dependent Claims.
Further characteristics and advantages of the present invention will be better understood in the course of the following description, which is considered by way of non-limiting example with reference to the attached drawings, in which:
- Figure 1 illustrates a first view in lateral elevation of a first embodiment of a device for welding of packages for packaging machines, which, according to the present invention, is provided with double-lever actuating means, and is in a first, open position with the welding bars at the maximum distance from one another;
- Figure 2 illustrates a view from above of the present device in Figure 1, in the open position;
- Figure 3 illustrates a second view in lateral elevation of the first embodiment of the present device, in a completely closed position, and with a minimum distance or gap between the welding bars;
- Figure 4 illustrates a view from above of the present device in Figure 3, in the closed position;
- Figure 5 illustrates a first view from above of a second embodiment of the present welding device provided with double-lever actuating means, and in a first open position with the welding bars at the maximum distance from one another;
- Figure 6 illustrates a view in lateral elevation of the double-lever actuating means of the present device in Figure 1, in the position in Figure 5;
- Figure 7 illustrates a second view from above of the second embodiment of the present device, in a second, closed position, with the welding bars at the minimum distance from one another; and
- Figure 8 illustrates a view in lateral elevation of the double-lever actuating means of the present device in Figure 7 in the closed position in Figure 7.
Description of the preferred embodiment of the invention
With reference to these appended drawings, and with particular reference to Figures 1 and 2 of the drawings, 15 indicates a chamber for the vacuum of a packaging machine which is under vacuum, for example a device for the production of packages under vacuum such as that described in patent application GE2011 A000006 which belongs to the holder of the present application. This chamber 15 for the vacuum, which is illustrated partially and schematically, comprises a lower container 16, which for example has a rectangular form, and an upper box-shaped frame 17. This frame 17 is provided in its upper part with a first opening 18, which can be closed hermetically by a sliding cover 19, and it is provided in its lower part with a second opening 20 for the passage of the packages to the lower container 16, which is provided with means, not illustrated, which can create the vacuum inside the chamber 15, and therefore put each package under vacuum. Each of the packages which reaches the chamber 1 for the vacuum, see for example the package P which is illustrated in Figure 2, is welded completely at the bottom, whereas at the top it has been welded partly. The final welding of the top of each of the packages is carried out by means of two welding bars 5 and 5', which are aligned transversely and are opposite one another. These bars are actuated by means of a device for transmission of motion, comprising a support structure 1 for two pairs of parallel horizontal guides 2 and 2'. This support structure 1 is entirely contained inside the chamber 15 for the vacuum. A pair of slides or runners 3 and 3' slide on the guides 2 and 2'. Each of these runners 3 and 3' is substantially a rectangular plate which is provided with four through holes, see for example the through hole 103, in which the two pairs of guides 2 and 2' are inserted. The runner 3 and the runner 3' positioned on each guide 2 and 2' translate simultaneously and in directions opposite to one another, then they are moved away from one another, or are brought closer to one another. The runner 3', which, looking at the Figures is disposed on the right-hand side of the device, is in a specular position, relative to a median plane M of the device, in relation to the runner 3 which is placed on the left-hand side. The runner 3' which is situated on the right-hand side supports a first plate 4', substantially in the form of an "L", which is placed in a specular position, relative to the median plane M, in relation to a second plate 4, which is substantially in the form of an "L", and is supported by the runner 3 which is situated on the left-hand side of the device. Each of these plates 4 and 4' supports respectively one of the said welding bars 5 and 5', which must be translated in one direction or the other. These bars 5 and 5' are also in a specular position relative to the median plane M of the device. Each of the slides 3 and 3' is connected by means of a small plate 6 and 6' provided with a corresponding pin 7 and 7' to a first final part of a corresponding arched lever: the pin 7 is connected to the free final first part 108 of a first arched lever 8, whereas the pin 7' is connected to a free final first part 108' of a second arched lever 8'. These final first parts 108 and 108' of the arched levers are in diametrically opposite positions. These arched levers 8 and 8' can have the form of an arc of a circumference, an arc of an ellipse or the like, and they are preferably the same. Each of these arched levers 8 and 8' comprises a second final part 208 and 208' which is connected to a support plate 9, in this case with a circular form. The second final part 208 of the arched lever 8 is connected to this plate 9 by means of a pin 10, around which this lever 8 can rotate, whereas the second final part 208' of the arched lever 8' is connected to the plate 9 by means of a pin 10' around which this lever 8' can rotate. The pins 10 and 10' and therefore the final parts 208 and 208' of the levers 8 and 8' are located in the vicinity of the periphery of the said plate 9, and in diametrically opposite positions relative to the plate. This support plate 9 is connected centrally to the shaft 11 of an electric motor 12, which is secured to a wall of the box-shaped frame 17 of the chamber or tank 15 for the vacuum. In the situation in Figures 1 and 2, the present device is illustrated in the open position, in other words with the welding bars 5 and 5' at the maximum distance L from one another, and therefore in this situation the package P can easily pass through the free space left between the said bars 5 and 5'.
In Figures 3 and 4, the present device is illustrated in the closed position, in other words with the welding bars 5 and 5' at the minimum distance from one another. In this situation, if the present device is applied to a device for production of packages under vacuum, such as that described in patent application GE2011 A000006 belonging to the holder of the present application, these bars 5 and 5' complete the welding of the top of the package P in the preceding Figures. In fact, this package reaches the chamber 15 for the vacuum with the bottom completely welded and with the top partially welded, and it is suitably positioned inside the lower container 16 of the said chamber 15. In this stage, the cover 19 hermetically closes this chamber 15 for the vacuum.
By means of the present welding device with double-lever actuation, the two welding bars 5 and 5' can pass at the required speed from the open position to the closed position, and vice versa. For example, in order to pass from the open position in Figures 1 and 2 to the closed position in Figures 3 and 4, in which the welding bars 5 and 5' complete the welding of the top of the package, the motor 12 is actuated such that the shaft 11 makes the plate 9 rotate by approximately 90° in the direction of the arrow R in Figure 1. Simultaneously with the rotation of the plate 9, there is also synchronous rotation of the arched levers 8 and 8' around the respective rotation pins 10 and 10', in the direction opposite that of the direction R of the support plate 9. When this rotation of the plate 9 is completed, the end parts 208 and 208' of the levers 8 and 8' will also have rotated by 90° in the direction of the arrow R, whereas the final parts 108 and 108' of the levers, and therefore the welding bars 5 and 5', will have been brought closer to one another (in this respect compare Figures 1 and 3 and Figures 2 and 4). In the passage from the open position to the closed position or vice versa, one of the two levers passes below the other. In this case the arched lever 8' passes below the lever 8, and thus the levers 8 and 8' can cross one another, naturally without any interference with one another. In order to pass from the closed position to the open position, when the bars 5 and 5' have completed the welding of the top of the package, it will be necessary to actuate the motor such that the plate 9 completes a rotation of approximately 90° in the direction of the arrow R' in Figure 3, opposite to the direction of the arrow R in Figure 1. As can be seen, when the rotation is completed, the rotation pins 10 and 10' of the final parts 208 and 208' of the respective arched levers 8 and 8' are still in a diametrically opposite position on the plate 9.
Depending on the dimension and form of the arched levers, as well as on the distance between the corresponding mobile parts, the angle of rotation which is imparted by the motor 12 to the plate 9 can be other than 90°.
The speed of bringing closer and moving away of the welding bars 5 and 5' is variable for the same speed of rotation of the motor 12, and in particular the speed of initial bringing closer, as well as that of final moving away in the opposite phase, of these two bars 5 and 5', is high, whereas when the bars are at a sufficiently close distance, there is distinct slowing down of their bringing closer, until the situation of minimum distance in Figures 3 and 4 is reached. Consequently these bars 5 and 5' are brought quickly closer to the package edges to be welded, whereas when these bars reach the vicinity of the said edges and come into contact with them, they will undergo distinct deceleration, so as to have adequate time to carry out the welding. In the same manner, whilst they are being moved away, these bars 5 and 5' will have substantially a first, relatively slow phase of detachment from the edges of the package, and a second, relatively fast phase of moving away from one another, such as to allow the package to pass through the bars which are once more in the open position, as in Figures 1 and 2.
Figures 5 and 6 illustrate a second embodiment of the present device applied to automatic packaging machines for production of packages, which device is not under vacuum, and comprises a support structure 21 in which the two horizontal and parallel guides 2 and 2' are provided. In this packaging machine, each package P which is obtained from a tubular forming element, not illustrated, must be welded transversely to the top and bottom, and also the packages in sequence must be separated from one another. It will be appreciated that the support structure 21 is provided with a central aperture 23 for the passage of each package P. In this case, the plates 4 and 4' support double welding bars 22 and 22'. The bar 22 comprises an upper 122 and lower 222 welding head between which there is provided a seat 322 for accommodation of a tool, not illustrated, for cutting and separation of one package from another in the packaging process. This cutting tool will be provided with corresponding actuators which allow it alternately to exit from the said seat 322 and return into it. The bar 22' also comprises two welding heads 122' and 222', which are aligned transversely to the heads 122 and 222 of the bar 22. Between these heads there is provided a seat 322' in which there is accommodated a counter-blade, not illustrated, which can co-operate with the cutting tool which emerges from the seat 322 of the bar 22. The double-lever actuating means of these bars 22 and 22' are altogether similar to those described for the first embodiment of the device, and therefore the same numbers correspond to the same elements as those described in Figures 1 - 4. To each of the plates 4 and 4' there is also connected an element 24 and 24' for support of a device for folding the edges of plastic material film of two opposite sides of the top or bottom of the package, and preferably the two short sides of the package. This folding device comprises two folding plates 25 and 25' which can be brought closer to one another and moved away from one another in the longitudinal direction, i.e. in the direction at right-angles to the transverse direction of alternate sliding of the bars 22 and 22' along the guides 2 and 2'. Each of the two plates 25 and 25' is provided with a suitably pointed end in order to fold the edges of the top or bottom of the package P, and a pin 26 and 26' is positioned on the plates. This pin 26 and 26' is accommodated inside a cam track 27 and 27' which is connected to the respective support element 24 and 24'.
In order to pass from the open position in Figures 5 and 6 to the closed position in Figures 7 and 8, in which the welding bars 22 and 22' carry out the welding of the top of a particular package, the welding of the bottom of the successive package, and the separation of these packages, the motor 12 is actuated such that the shaft 11 rotates the plate 9 by approximately 90°, similarly to the situation seen in Figure 1. Simultaneously with the rotation of the plate 9, there is synchronous rotation of the arched levers 8 and 8' around the respective rotation pins 10 and 10', in the direction opposite the direction of rotation of the support plate 9. When this rotation of the plate 9 is completed, the end parts 208 and 208' of the levers 8 and 8' will also have rotated by 90°, whereas the final parts 108 and 108', and therefore the welding bars 22 and 22', will have been brought closer to one another. Substantially, by means of a single rotation of the motor 12 in one direction and for a limited angle, there is simultaneous transverse translation which brings the welding bars 22 and 22' closer in the direction of the arrows B and B' in Figure 5, and at the same time simultaneous longitudinal translation which brings the two folding plates 25 and 25' closer to the edges of the short sides of the package in the direction of the arrows A and A' in Figure 5. In order to pass from the closed position to the open position, when the bars 22 and 22' have completed the welding of the top of a package, the welding of the bottom of a successive package, and the separation of the packages, it will be necessary to actuate the motor such that the plate 9 completes a rotation of approximately 90° in the direction opposite the one previously described.

Claims

1. Device for welding of packages, for packaging machines, characterized in that it comprises at least one pair of welding bars (5, 5', 22, 22') which face one another and are each connected to a corresponding suitably shaped actuating lever (8, 8'), each of the said levers (8, 8') being connected firstly and in a rotatable manner to a support (9) which can be rotated by means of suitable actuating means (11, 12), and secondly connected to a corresponding welding bar (5, 5', 22, 22') which can be moved in one direction or the other on suitable sliding guides (2, 2'), the rotary motion of the support (9) being transformed into synchronous rotary motion of each of the said levers (8, 8') and thus into alternating linear motion of the said welding bars (5, 5', 22, 22').
2. Device according to Claim 1, characterized in that the said support (9) is connected, by means of a first rotation pin (10), to a final part (208) of a first lever (8) of the said pair of levers (8, 8'), and, by means of a second rotation pin (10'), to a final part (208') of a second lever (8') of the said pair of levers (8, 8'), the other final part (108, 108') of each of the said levers (8, 8') being connected to means (3, 3', 4, 4', 6, 6', 7, 7') for support and translation of each of the said welding bars (5, 5', 22, 22').
3. Device according to Claim 1, characterized in that it comprises at least one pair of elements (25, 25') for folding of two opposite sides of each package, the said folding elements (25, 25') being connected to the said means (3, 3', 4, 4', 6, 6', 7, 7') for support and translation of each of the said welding bars (5, 5', 22, 22'), such as to move simultaneously with the said means (3, 3', 4, 4', 6, 6', 7, 7') for support and translation.
4. Device according to Claim 1, characterized in that the said levers (8, 8') are in an arched form.
5. Device according to Claim 1, characterized in that, during the said rotation in one direction or another of the support (9), the said levers (8, 8') cross one another without any interference with one another.
6. Device according to Claim 3, characterized in that each of the said folding elements (25, 25') is provided with at least one pin (26, 26') which is accommodated in a cam track (27, 27') connected to the said means (3, 3', 4, 4', 6, 6', 7, 7') for support and translation of each of the said bars (5, 5', 22, 22').
7. Device according to Claim 3, characterized in that the said folding elements (25, 25') move simultaneously in opposite directions and substantially at right-angles to the direction of motion of the said welding bars (22, 22'), which move simultaneously and in opposite directions along the said guides (2, 2').
8. Device according to Claim 2, characterized in that the said first and second rotation pins (10, 10') are positioned in the vicinity of the periphery of the said support (9).
9. Device according to Claim 2, characterized in that the said first and second pins (10, 10') and therefore the said final parts (208, 208') of the levers (8, 8') are placed on the said plate (9) in diametrically opposite positions.
10. Device according to Claim 2, characterized in that the said other final parts (108, 108') of the levers (8, 8') are connected by means of at least one pin (7, 7') to the said plates (4, 4') for support of the said operative units (5, 5'), the said support plates (4, 4') being fitted on runners or slides (3, 3') which slide along the said guides (2, 2').
11. Device according to Claim 2, characterized in that, when the support (9) is rotated in a particular direction (R, R'), the said levers (8, 8') rotate simultaneously around the said first and second pins (10, 10'), in the direction opposite the said particular direction (R, R').
12. Device according to Claim 1, characterized in that the said actuating means (11, 12) of the said support, the said levers (8, 8') and the said welding bars (5, 5') with corresponding sliding guides (2, 2'), are accommodated inside a chamber (15) for production under vacuum of the packages.
PCT/EP2012/059556 2011-05-26 2012-05-23 Device with double-lever actuation for welding of packages, for packaging machines WO2012160077A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000058A ITGE20110058A1 (en) 2011-05-26 2011-05-26 "PACKAGE WELDING DEVICE WITH DOUBLE LEVER DRIVE FOR PACKAGING MACHINES".
ITGE2011A000058 2011-05-26

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
WO2017081060A1 (en) * 2015-11-10 2017-05-18 Khs Gmbh Bag forming apparatus
EP3063071A4 (en) * 2013-11-01 2017-08-02 Frito-Lay North America, Inc. Method and apparatus for making a structurally resilient package
IT201600129829A1 (en) * 2016-12-22 2018-06-22 Altopack Spa Apparatus for forming the head of food bags.
WO2020208211A1 (en) * 2019-04-12 2020-10-15 Closac Ag Welding unit

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US4079662A (en) * 1976-11-30 1978-03-21 Triangle Package Machinery Company Bag making machine
EP0380868A2 (en) * 1989-01-31 1990-08-08 Kliklok Corporation Sealing apparatus and method for bags
EP2319766A1 (en) * 2008-08-08 2011-05-11 Ulma Packaging Technological Center, S.Coop. Vertical packaging system and method

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Publication number Priority date Publication date Assignee Title
US4079662A (en) * 1976-11-30 1978-03-21 Triangle Package Machinery Company Bag making machine
EP0380868A2 (en) * 1989-01-31 1990-08-08 Kliklok Corporation Sealing apparatus and method for bags
EP2319766A1 (en) * 2008-08-08 2011-05-11 Ulma Packaging Technological Center, S.Coop. Vertical packaging system and method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3063071A4 (en) * 2013-11-01 2017-08-02 Frito-Lay North America, Inc. Method and apparatus for making a structurally resilient package
WO2017081060A1 (en) * 2015-11-10 2017-05-18 Khs Gmbh Bag forming apparatus
IT201600129829A1 (en) * 2016-12-22 2018-06-22 Altopack Spa Apparatus for forming the head of food bags.
EP3339196A1 (en) * 2016-12-22 2018-06-27 Altopack S.P.A. Apparatus for forming the head of bags for foods
WO2020208211A1 (en) * 2019-04-12 2020-10-15 Closac Ag Welding unit

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