EP0117663B2 - Appareil pour la fermeture d'un récipient foliforme - Google Patents

Appareil pour la fermeture d'un récipient foliforme Download PDF

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Publication number
EP0117663B2
EP0117663B2 EP84300748A EP84300748A EP0117663B2 EP 0117663 B2 EP0117663 B2 EP 0117663B2 EP 84300748 A EP84300748 A EP 84300748A EP 84300748 A EP84300748 A EP 84300748A EP 0117663 B2 EP0117663 B2 EP 0117663B2
Authority
EP
European Patent Office
Prior art keywords
frame
closure
container
die
support plate
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
EP84300748A
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German (de)
English (en)
Other versions
EP0117663B1 (fr
EP0117663A1 (fr
Inventor
Rik Noten
Bart Hensbroek
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.)
Ekco NV
Original Assignee
Ekco NV
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
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Application filed by Ekco NV filed Critical Ekco NV
Priority to AT84300748T priority Critical patent/ATE29446T1/de
Publication of EP0117663A1 publication Critical patent/EP0117663A1/fr
Application granted granted Critical
Publication of EP0117663B1 publication Critical patent/EP0117663B1/fr
Publication of EP0117663B2 publication Critical patent/EP0117663B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B7/00—Closing containers or receptacles after filling
    • B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
    • B65B7/28—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by applying separate preformed closures, e.g. lids, covers
    • B65B7/2842—Securing closures on containers
    • B65B7/285—Securing closures on containers by deformation of the closure
    • B65B7/2857—Securing closures on containers by deformation of the closure and the container rim

Definitions

  • This invention relates to a closure die assembly for a machine for closing aluminium foil containers with an aluminium foil lid.
  • Aluminium foil containers are well known.
  • One type of prior art foil container is in the form of a dish having a peripheral outwardly extending flange; the flange may be reinforced by folding the foil to double thickness.
  • Afoil cover is provided having a downwardly extending peripheral flange. The cover fits snugly over the container and the cover flange is turned under the container flange to retain the cover on the container. The cover may be crimped to the container flange to seal the contents therein.
  • Such containers are frequently used to package food; they are cheap, hygienic and have a good appearance.
  • Foil containers may be easily damaged or deformed during the closing process and it is important that a bad closure is detected. Damaged or deformed containers disrupt a flow line production and moreover, a bad closure cannot be rectified by replacing a badly fitting cover because of the fragile nature of the container, the contents of a damaged container are thus wasted.
  • Closure machines have been proposed to automatically secure foil covers to foil containers. Such machines can provide a secure repeatable closure with a low rejection rate.
  • German Patent DE-C-2511218 discloses a machine for automatically securing a foil cover to a foil container.
  • the closure mechanism has upper and lower moving dies and operates in two stages.
  • the upper die holds the cover onto the container and bends the cover edge flange vertically downward around the container flange; the lower die completes the closure urging a multipart frame assembly upwards and inwards to secure the cover to the container flange.
  • the closure mechanism includes a separate crimping frame to crimp the folded edge of the container. This action seals the closed container and is especially desirable where the container contains hot foods and liquids.
  • a further disadvantage of prior art closing machines is that a separate frame is required to crimp the edge of the closed container. Crimping is necessary to ensure the contents are sealed and to prevent leakage. Separate crimping apparatus increases the complication and expense of the closing machine.
  • European Patent Publication EP-A-0091813 is a prior art document under Article 54(3) and (4) EPC and discloses an improved closing mechanism having a single moving die which moves in successive stages. Initial movement of the die bends the flange of the cover downward around the containerflange and the further movement of the die causes a multi-part frame assembly to bend the cover flange under the container flange and thus secure the cover to the container.
  • the mechanism includes a separate crimping frame.
  • DE-U-81 22 539.3 discloses a closing mechanism in which the multi-part closing frame acts also as the crimping frame.
  • a closure die assembly having a die frame and a closure die movable axially thereof in sequential closing and crimping stages.
  • the closure die comprises a support frame having a support plate to hold a cover against a container and closure means comprising a multi-part frame assembly and movable transversely of the support frame to fold an edge flange of the cover under an edge flange of the container.
  • closure stage axial movement of the closure die bends the cover edge flange vertically downward and inward under the container edge flange.
  • the support plate is movable axially of the support frame to cause the folded edge flange of the cover to be crimped between the support plate and the closure means.
  • a separate crimping frame is not required.
  • the arrangement has a number of disadvantages.
  • the abutments which control the crimping operation are outside the multi-part die frame.
  • the mechanism is therefore unduly bulky.
  • the disclosed die is not adaptable to automatic operation in which a knife is used to shear aluminium foil sheet in the manner disclosed for example in EP-A-0091813 because the knife cannot be placed sufficiently close to the die to cut a cover the appropriate size.
  • the crimping force of the die is not easily adjusted.
  • the support plate for the foil cover does not hold the cover against the container during the closing stage but only during the crimping stage.
  • the present invention seeks to provide an improved closing mechanism for securing foil covers to foil containers which substantially overcomes the aforementioned disadvantages. This is obtained by a closure die assembly having the features specified in claim 1.
  • the invention provides a separate assembly comprising the major working components of the closing mechanism and which includes means to crimp the folded edge of container and cover without a separate crimping mechanism.
  • the assembly can easily be removed from a container closing machine for cleaning and adjustment and moreover the assembly may be interengageable with other closure die assemblies suitable for different size containers.
  • a further advantage is that the closure assembly is disposed substantially above containers to be closed thus reducing the likelihood of food fouling the mechanism.
  • the area below the containers is substantially clear of operating parts and thus spillages and slops may easily be dealt with.
  • the simplified closure assembly is thus generally more compact and robust than prior art closing machines.
  • resilient means such as coil springs, oppose relative movement between the support frame and the support plate.
  • the springs may urge the frame and plate into direct abutment.
  • guide means are provided to locate and guide the support plate relative to the support frame.
  • the guide means may be hardened steel pins fastened to the support plate and journalled in sleeve bearings of the support frame.
  • Return springs may be provided between the support frame and enlarged heads of the guide pins; the springs may be coiled compression springs disposed around the guide pins.
  • An abutment is provided between the die frame and the support plate to initiate relative axial movement between the support frame and the support plate.
  • the abutment may be adjustable in order to allow initiation of relative axial movement to be varied.
  • the closure means preferably comprise four generally "L” shaped members arranged to form a rectangle and urged apart by springs located between adjacent free ends of the members.
  • the members are movable inwardly of the support frame by ramp means of the die frame to fold the flange of the cover under the flange of the container.
  • the ramp means may act directly at the corner of each "L" shaped member or act on the arms of the members.
  • Each frame member has a jaw to receive and fold an edge flange of the cover and each jaw preferably has an upstanding inner lip to crimp the folded edge of the flange.
  • the jaw provides a re-entrant chamber to receive the extreme edge of the crimped flange outboard of the crimp line.
  • the support plate has a continuous upstanding peripheral lip for engagement with the upstanding lip of the frame members and between which the container flange is crimped.
  • the upstanding lips may engage at an angle in order to provide a superior crimp action.
  • the upstanding lip of the support plate is preferably triangular in section, the inner face of the lip co-operating with the lip of the frame members and the outer face of the lip forming a closing side of the re-entrant chamber of each jaw.
  • FIG. 1 A prior art closing die will now be described with reference to Figures 1 to 8 in order to explain fully the operation of a typical container closing machine.
  • Figures 1 to 8 are somewhat schematic.
  • a typical closing frame comprising four generally "L" shaped resilient members 11, preferably made of nylon, arranged to form a rectangle.
  • the members are biassed apart by compression springs 12 acting between adjacent ends of the members 11.
  • the springs may be partially located in recesses of the frame members.
  • a support frame 13 comprises a top plate 14 and support plate 15 spaced by distance pieces 16.
  • the frame 13 locates and guides the frame members 11 for inward movement.
  • a die frame 17 has rigid guides 18 having ramp faces which act on corresponding faces of the frame members 11.
  • the guides 18 are arranged in rectangular formation to act each on adjacent arms of two "L" shaped members 11.
  • Return springs 19 are also provided between the die frame and support frame.
  • One or more guide pins 20 locate and guide the support frame 13 relative to the die frame 17.
  • a base frame 21 forms part of a lower die assembly which comprises a crimping frame 23 and an inner die frame 22 movable in the crimping frame.
  • An ejector plate 24 has guide pins 25 located in journals of the base frame 21.
  • Springs 26 act to urge the inner die frame 22 and base frame 21 apart.
  • An upper die assembly comprises an upperframe 27 to which the die frame 17 is attached by clamps 28.
  • Guideways 31 are provided for aluminium foil sheet 32 to be fed in a direction perpendicular to the drawing sheet as viewed.
  • a knife comprising a fixed blade 33 and a movable blade 34 hinged to the fixed blade at pivot 35 cuts the sheet 32 on operation of the closure machine as will be described in further detail hereafter.
  • the closure machines operates in the following manner.
  • Figure 3 shows the mechanism in the open or start position.
  • An aluminium foil container 36 is placed on the ejector plate 24; the container may be transported to the plate 24 by conveyor belt or any other convenient means. Aluminium foil sheet is fed from a roll (not shown) through guides 31 until the container is covered. The method of feeding the precise length of foil sheet forms no part of the present invention.
  • the base frame 21 is carried upward by rams 37 ( Figure 4) pushing the inner die frame 22 under the edge flange of the container 36 which is lifted clear of the ejector plate 24.
  • the base frame 21 carries the movable knife 34 upwards by virtue of a generally “L” shaped member 38 held against the base frame (21) by a spring 39, and a ball or roller41 engaging in a recess of the movable knife 34.
  • the movable knife 34 cuts the foil sheet 32 against the fixed knife 33 by means of a scissor action thus forming the foil cover for the container 36.
  • the foil container moves under and engages the foil cover ( Figure 5).
  • the movable knife 34 engages an abutment 42 and the ball or roller 41 disengages the movable knife recess.
  • the ejector plate 24 is lifted with the base frame 21.
  • Figure 8 shows the final position of the closure mechanism.
  • the upper die assembly rests against the upper frame 27 and continued upper movement of the base frame 21 against the effect of return springs 26 urges the crimping frame 23 against the folded edge flange of the close container. This action is best shown in Figure 8a.
  • the apparatus above described has the advantage that the container cover can be cut from a roll of foil and shaped during the closing operation.
  • Such a mechanism may be incorporated with the present invention although it is not essential.
  • the present invention effectively eliminates the need for a separate crimping machanism, so simplifying operation of the closure die.
  • FIG. 9 there is shown a closure die assembly 110 having four generally "L" shaped frame members 111 biassed apart by coil springs 112. The sections 111 are held and guided in a rigid support frame 113 in a similar manner to the assembly of Figures 1 and 2.
  • FIG. 10 The left side of Figure 10, as viewed, shows the assembly in the open condition.
  • a foil container 136 is placed on a lower base plate (not shown) which may be similar to that shown in Figures 3 to 8.
  • An ejector plate may or may not be provided.
  • a cover 145 is provided for the container; the cover may be preformed or cut from a roll of sheet material in the manner previously described.
  • the container is raised towards the closure die assembly and the edges of the cover bent downward by a ramp face 150 provided on the lower inner face of each of the frame members 111.
  • the support frame As the container contacts support plate 115, the support frame is moved upward by connecting rod 151 to move with the container baseplate. Actuation of the support frame may be by abutment with the baseplate or by separate synchronized linkage.
  • Top plate 114 of the support frame is rigidly connected to the connecting rod via pins 152 and headstock 153.
  • Bushes 154 guide and locate the pins 152 and hence the support frame relative to the die frame 117.
  • the container baseplate continued to move upward at the same rate as the support frame to the position shown on the right hand side of Figure 11, as viewed.
  • the frame members 111 are moved inwardly by the ramp faces of the guides 118 against the effect of springs 112 to bend the coverflange underthe container flange.
  • the folded edge of the container and cover enter into the jaw provided by each of the frame members 111.
  • the su pport frame 113 has a lower portion comprising a support plate 115 for the cover and an intermediate plate 163.
  • the plates 115 and 163 are normally biassed together by coiled compression springs 157 acting through shouldered bolts 158 secured to the support plate.
  • the bolts 158 locate and guide the support plate relative to the support frame 113.
  • Each jaw has an upstanding inner lip 160 to crimp the folded edge of container and cover against the support plate 115, the re-entrant portion of the jaw behind the upstanding lip accommodating the folded edge of the closed container.
  • An upstanding lip of the support plate 162 is of generally triangular section and provides a superior crimp by virtue of the relative movement between the inner angled face and the corresponding angled face of the upstanding lip of each frame member 111.
  • the outer angled face of the support plate lip closes a chamber formed by the re-entrant portion of each member jaw.
  • the chamber formed to receive the edge of the closed container accommodates the rolled edge of a container, as best seen in Figures 7a and 8a, and sur- plussage of foil material caused by the flange of the cover being folded under the edge of the container. It is important that the rolled edge of the container is not flattened during the crimping operation since it imparts extra rigidity to an otherwise inherently weak construction.
  • Lifting handles 159 are provided for the die assembly which may be secured in the fixed frame of a closure machine by any quick and convenient means.
  • Connecting rod 151 is simply coupled to the headstock 153 by a bayonet fitting gudgeon pin 161, best seen in Figure 9.
  • the headstock and container baseplate are intended to be moved in sequence by a rotary camshaft. Once the container has been closed the closure sequence will reverse to release the closed flange and allow the container to drop from the support plate (115) for removal from the machine. This operation completes one operational sequence.
  • the guides 118 are arranged in rectangular formation to act each on adjacent arms of two "L" shaped members 111. This arrangement is convenient but not essential.
  • the closure die assembly thus comprises a separate unit which is easily detached and removed from a closure machine for cleaning and maintenance and may be substituted by an alternative assembly suitable for different size containers.
  • the mechanism of the closure die assembly is disposed substantially above the container so reducing the likelihood of container contents fouling the mechanism.
  • the area below the container which is preferably a plain baseplate, is free of mechanism and may thus be easily cleaned and kept clear of spillages.
  • Actuation of the headstock and container baseplate may be alternatively by air under pressure, by electrical actuators or any other convenient means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closing Of Containers (AREA)
  • Supplying Of Containers To The Packaging Station (AREA)

Claims (9)

1. Outillage de fermeture pour fixer un couvercle en feuille sur un récipient en feuille et comprenant un bâti d'outil (117) et un outil de fermeture (114 à 116, 163) mobile axialement par rapport à lui, l'outil de fermeture comprenant un bâti de support (114, 116, 163), une plaque de support (115) afin de maintenir un couvercle contre un récipient, et des moyens de fermeture (111) qui glissent transversalement au bâti de support (114, 116,163) pour plier un rebord de rive d'un couvercle au-dessous d'un rebord de rive d'un récipient lors d'un mouvement axial relatif entre ledit outil de fermeture (114 à 116, 163) et ledit bâti d'outil (117), la plaque de support (115) étant mobile axialement au bâti de support (114, 116, 163) contre une force de rappel (157), caractérisé en ce que ladite plaque de support (115) est normalement en butée contre le bâti de support (114, 116,163), lesdits moyens de fermeture (111) glissent dans ledit bâti de support (114, 116, 163) pendant le mouvement axial relatif entre ledit outil de fermeture (114 à 116,163) et ledit bâti d'outil (117), et ladite plaque de support (115) comporte une butée (155) destinée à porter contre ledit bâti d'outil (117) afin que la poursuite du mouvement axial relatif entre ledit outil de fermeture et ledit bâti d'outil éloigne ledit bâti de support (114, 116, 163) de ladite plaque de support (115) pour sertir un rebord de rive plié du récipient et du couvercle entre la plaque de support (115) et les moyens de fermeture (111).
2. Outillage de fermeture selon la revendication 1, caractérisé en ce que des moyens élastiques (157) s'opposent à un mouvement axial relatif entre ledit bâti de support (114, 116, 163) et ladite plaque de support (115).
3. Outillage de fermeture selon la revendication 1 ou la revendication 2, caractérisé en ce que le bâti de support (114, 116, 163) comprend des moyens (158) de positionnement destinés à positionner la plaque de support (115) par rapport à lui.
4. Outillage de fermeture selon la revendication 3, caractérisé en ce que lesdits moyens de positionnement (158) guident la plaque (115) de support pour qu'elle se déplace axialement par rapport au bâti de support (114, 116, 163).
5. Outillage de fermature selon la revendication 4, caractérisé en ce que lesdits moyens de positionnement comprennent plusieurs goujons (158) de guidage orientés vers le haut, fixés à la plaque (115) de support et passant dans des coussinets du bâti de support (114,116,163), les goujons de guidage comportant une tête élargie et des ressorts hélicoïdaux (157) étant disposés autour de chacun des goujons de guidage, entre le bâti de support et une tête élargie respective, afin de rappeler la plaque de support vers le bâti de support.
6. Outillage de fermeture selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une butée réglable (156) est prévue dans le bâti d'outil (117) pour coopérer avec ladite butée (155) et pour amorcer un mouvement axial relatif entre ledit bâti de support (114, 116, 163) et ladite plaque de support (115).
7. Outillage de fermeture selon l'une quelconque des revendications précédentes, caractérisé en ce que les moyens de fermeture comprennent plusieurs éléments de bâti (111) ayant chacun une mâchoire destinée à recevoir et plier un rebord de rive du couvercle, chaque mâchoire comportant une lèvre intérieure (160) orientée vers le haut pour sertir le rebord de rive plié du couvercle et du récipient.
8. Outillage de fermeture selon la revendication 7, caractérisé en ce que la plaque (115) de support comporte une lèvre périphérique continue (162) orientée vers le haut destinée à s'enclencher avec la lèvre intérieure (160) orientée vers le haut desdits éléments de bâti (111).
9. Outillage de fermeture selon la revendication 8, caractérisé en ce qu'une chambre destinée à recevoir un rebord de rive du couvercle et du récipient est définie par la mâchoire et la lèvre intérieure (160) orientée vers le haut desdits éléments de bâti (111) et par le bord extérieur de la lèvre périphérique (162) orientée vers le haut de ladite plaque de support (115).
EP84300748A 1983-02-08 1984-02-07 Appareil pour la fermeture d'un récipient foliforme Expired - Lifetime EP0117663B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84300748T ATE29446T1 (de) 1983-02-08 1984-02-07 Verschliessapparat fuer folienartigen behaelter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8303449 1983-02-08
GB838303449A GB8303449D0 (en) 1983-02-08 1983-02-08 Foil container closing apparatus

Publications (3)

Publication Number Publication Date
EP0117663A1 EP0117663A1 (fr) 1984-09-05
EP0117663B1 EP0117663B1 (fr) 1987-09-09
EP0117663B2 true EP0117663B2 (fr) 1993-03-24

Family

ID=10537660

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84300748A Expired - Lifetime EP0117663B2 (fr) 1983-02-08 1984-02-07 Appareil pour la fermeture d'un récipient foliforme

Country Status (4)

Country Link
EP (1) EP0117663B2 (fr)
AT (1) ATE29446T1 (fr)
DE (1) DE3465949D1 (fr)
GB (1) GB8303449D0 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2826026A (en) * 1956-02-10 1958-03-11 Sutherland Paper Co Machine for applying covers to dishes
US3017729A (en) * 1959-05-26 1962-01-23 Reynolds Metals Co Shrinkable container closure and manufacture thereof

Also Published As

Publication number Publication date
ATE29446T1 (de) 1987-09-15
GB8303449D0 (en) 1983-03-16
DE3465949D1 (en) 1987-10-15
EP0117663B1 (fr) 1987-09-09
EP0117663A1 (fr) 1984-09-05

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