EP0057144B1 - Machine for packaging cylindrically shaped objects in blanks cut from thermoplastic webs - Google Patents

Machine for packaging cylindrically shaped objects in blanks cut from thermoplastic webs Download PDF

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Publication number
EP0057144B1
EP0057144B1 EP82400121A EP82400121A EP0057144B1 EP 0057144 B1 EP0057144 B1 EP 0057144B1 EP 82400121 A EP82400121 A EP 82400121A EP 82400121 A EP82400121 A EP 82400121A EP 0057144 B1 EP0057144 B1 EP 0057144B1
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EP
European Patent Office
Prior art keywords
packaging
fixed
plate
mobile
head
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
Application number
EP82400121A
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German (de)
French (fr)
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EP0057144A2 (en
EP0057144A3 (en
Inventor
Jacques Edmond Maurice Evrard
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Individual
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Individual
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Publication date
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Priority to AT82400121T priority Critical patent/ATE13649T1/en
Publication of EP0057144A2 publication Critical patent/EP0057144A2/en
Publication of EP0057144A3 publication Critical patent/EP0057144A3/en
Application granted granted Critical
Publication of EP0057144B1 publication Critical patent/EP0057144B1/en
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/3846—Cutting-out; Stamping-out cutting out discs or the like
    • 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
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B11/54—Wrapping by causing the wrapper to embrace one end and all sides of the contents, and closing the wrapper onto the opposite end by forming regular or irregular pleats

Definitions

  • the invention relates to machines for packaging objects of substantially cylindrical shape, such as cheeses, ribbons wound with sticky paper or for a typewriter, deodorant blocks for sanitary facilities, etc., and more particularly relates to machines for packaging these objects in sheets cut according to closed contours, preferably convex, such as circular discs, in strips of flexible packaging material, such as paper, aluminum and films of transparent or non-transparent plastic material and possibly heat-sealable, the packaging sheet can preferably be regularly pleated around the periphery of the object.
  • Such a machine comprises a fixed packaging head and a movable packaging head, in the form of two crowns of common axes, capable of enclosing a packaging sheet between them when they are brought one against the other. 'other, and whose central openings are coaxial with at least one socket for the passage of the objects to be packed, arranged in the extension of the central opening of the fixed packaging head and attached to the face of the latter which does not is not turned towards the movable packing head.
  • a diaphragm device partially seals the sleeve by folding the packaging sheet over one of the faces of an object, after the latter has been disposed by its other face against the part of the sheet closing the central openings. packing heads applied against each other, then pushed with this sheet into the socket by a movable plunger, until it comes to rest against a support plate perpendicular to the axis of the socket. A sealing member is introduced into the sleeve and applied through the diaphragm to the part of the packaging sheet folded over the object resting against the support plate, after the movable pusher has been withdrawn from the sleeve.
  • the packaging heads are provided on their opposite faces with complementary radial teeth, to initiate a pleating of a sheet which they enclose, so as to pack the object in a pleated sheet at its periphery , the axis common to the packaging heads and to the sleeve being vertical, and the movable head being disposed above the fixed head.
  • Packing machines of this type must be supplied on the one hand with objects to be packaged, on the other hand with cut sheets, either manually or automatically for one and / or the other of these operations.
  • a machine for cutting thin sheets according to closed contours in strips of packaging material comprising, on the one hand, for enclosing a strip of packaging material, two trays, one of which is fixed and has a slot having the shape of the closed contour to be cut, and the other of which is mobile and has a groove on the opposite face of the first, this groove coming to be superimposed on the slot along the closed contour, when the two plates are applied one against the other, and, on the other hand, for cutting this sheet, a cutting tool, carried by a following mobile equipment the outline of the closed contour, and movable in a direction perpendicular to the plates between a cutting position in which the tool crosses the slot and is engaged in the groove, and a rest position in which the tool is not engaged in the groove.
  • the fixed plate When the closed contour, common to the slot and the groove is circular, the fixed plate consists of a central circular disc surrounded by a fixed plate and carried by a fixed shaft, serving as a pivot for the movement of the crew mobile and guide for the movement perpendicular to the cutting tool plate.
  • suction nozzles in the central disc are provided, these nozzles being connected to a vacuum chamber arranged in this disc, and put in communication with a vacuum pump.
  • the transfer of the cut sheet from the cutting machine to the packaging machine is ensured by the sliding, on at least one slide going from one to the other of these machines, of a suction probe, carried by a tubular arm, and capable of moving between a position inside the contour, in which it is engaged in a notch of the movable plate and placed in communication with the source of vacuum while the connection of the latter with the nozzles is cut, and a position outside the contour, plumb with the lower pleating and packaging head of the associated packaging machine, on which the cut sheet is deposited as soon as the connection with the vacuum source is cut.
  • suction nozzles on the plate stationary cutting machine, near and around the slot, the operation of these nozzles to be synchronized with the step by step advance of the strip of packaging material on the fixed plate of the cutting machine.
  • the maximum rate of operation operation of an installation associating the two aforementioned machines is determined from the lowest of the maximum rates of these two machines, and taking into account the significant duration of the transfer of a cut sheet from the cutting machine to the machine to be packaged, which constitutes a significant limitation in the operation of such an installation, in particular for large diameter discs, which can cling to the mechanism for advancing the strip of packaging material on the fixed plate of the cutting machine.
  • such an installation is bulky and difficult to adjust since the two associated machines must operate in synchronism.
  • the machine according to the invention is more than a space requirement. limited, of a simplified structure and adjustment, and authorizing increased rates due in particular to the elimination of any phase of transfer of the cut sheets from one station to another.
  • This machine according to the invention also makes it possible to cut large area sheets and to pack bulky objects while having a simple structure.
  • the subject of the invention is a machine for packaging objects of substantially cylindrical shape in sheets each cut according to a closed contour, preferably circular, in a strip of a fixed flexible packaging material and a head of mobile packaging in the form of two crowns of common axis, capable of enclosing between them a packaging sheet when the mobile head is brought against the fixed head and whose central openings are coaxial, at least one socket disposed in the extension of the central opening of the fixed packaging head and attached to the face of the latter which is not turned towards the mobile packaging head, a mobile pusher making it possible to push an object to be packaged and the sheet onto which has been arranged, inside the sleeve up to a support plate perpendicular to the axis of the sleeve, a diaphragm device allowing by partial sealing of the sleeve to fold the sheet of packaging on one side of the object resting on the support plate, a sealing member being introduced into the socket and applied, through the diaphragm, to the part of the packaging
  • the machine of the type indicated above is, according to the invention, characterized in that it comprises, on the one hand, for gripping the strip of flexible packaging material, a fixed plate having a central opening whose shape corresponds to that of the outline of the leaves, and whose section is slightly greater than that of the leaves, as well as a movable pressure plate, parallel to the fixed plate and having on its face opposite the latter a groove having the shape of the contour of the leaves and coming opposite the central opening of the fixed plate when the pressure plate is applied against the latter, the pressure plate also having a central opening internal to the groove, allowing the passage of the movable packaging head, and, on the other hand, for cutting a sheet from a strip pressed between the fixed plate and the pressure plate, a movable element following the outline of the sheets around the fixed packaging head projecting inside the opening central structure of the fixed plate, and a cutting tool, carried by the mobile assembly and movable in a direction perpendicular to the fixed plates and presser between a cutting position, in which the tool crosses the central opening
  • the cutting tool is integral with a yoke pivotally mounted on the outer end of the radial arm, around a radial axis perpendicular to the axis of rotation of the ring rotating, and a roller is mounted in rotation in the yoke around a second radial axis, perpendicular to the axis of rotation of the ring, to roll on a ring surrounding with play the rotating ring, and displaceable in translation along the 'axis of rotation of the ring, in order to control the position of the cutting tool.
  • the axial position of the ring which controls the position of the cutting tool, is itself controlled by jacks to which the ring is resiliently biased.
  • the pressure plate has, on its face opposite the fixed plate, and between its groove and its central opening, a plurality of suction nozzles opening into at least one annular channel placed in communication with a vacuum source, to press the part of the strip of flexible packaging material closing the central opening of the fixed plate against the pressure plate.
  • the strip of flexible material is held and moved between the fixed plate and the pressure plate by a step-by-step feed device, comprising at least one pair of pliers, capable of being moved on slides along the fixed plate by at least one fork, pivotally mounted around an axis transverse to the direction of movement of the strip on the fixed plate, and operated by a jack.
  • a step-by-step feed device comprising at least one pair of pliers, capable of being moved on slides along the fixed plate by at least one fork, pivotally mounted around an axis transverse to the direction of movement of the strip on the fixed plate, and operated by a jack.
  • the facing faces of the packaging heads are provided with complementary radial teeth to initiate pleating of a sheet which they enclose, so as to pack the object in a pleated sheet at its periphery, the axis common to the packaging heads and the sleeve being vertical, the movable head being disposed above the fixed head, likewise the pressure plate is disposed above the fixed plate.
  • the mobile packaging head of the machine is suspended with lost travel, on the rods of jacks mounted on gantries secured to the mobile pressure plate, on either side of the mobile packaging head, by means diametrically opposite lugs having openings through which the rods of jacks whose ends carry lug drive stops, which are shaped in ears against bent to connect to the face of the movable head not turned towards the fixed head.
  • the movable pressure plate is mounted sliding along columns connecting fixed plates to the fixed plate carrying jacks for controlling the movement of the pressure plate towards the fixed plate, by their rods provided at their free end.
  • spherical caps cooperating with imprints of the mobile presser plate, which is resiliently biased towards the fixed crosspieces by springs bearing on the one hand against the fixed plate, and on the other hand against the bottom of sleeves carried by lateral tabs of the pressure plate and crossed with guidance by the columns.
  • the support plate is mounted at the end of a rod of a jack and can be introduced by the latter into the socket, until its bearing surface either at the central opening of the fixed packaging head, then pushed back with the object by the pusher-mobile, the stroke of which is limited so that the object is introduced into the socket beyond the device to diaphragm, the support plate being immobilized in this position by a locking system during the operations of the diaphragm device and of the sealing member, then moved to remove the wrapped object from the sleeve and place it on the path an ejection member bringing the object to an evacuation station.
  • the movable pusher may be in the form of an annular piston moved by a cylinder eccentric relative to the axis of the packaging heads, the sealing member being axially displaceable through the annular piston by an axial cylinder parallel to the eccentric cylinder.
  • the sealing member can be a welding head, if the flexible packaging material is a thermoplastic material, or a label holder, which covers the packaged object to deposit a self-adhesive label on the latter, in other cases .
  • the machine comprises a fixed plate 1, horizontal and rectangular, pierced with a circular central opening 2, of section slightly greater than that of circular sheets or discs in which objects of substantially cylindrical shape, such as only cheeses, must be packaged.
  • This fixed plate 1 also has, along the major part of its long sides, two grooves 3, and each at its four corners, a mounting hole for a vertical guide column 4.
  • a movable pressure plate 5, disposed horizontally above the fixed plate 1 is slidably mounted in a vertical direction by means of four lateral tabs 6, integral with the four corners of the pressure plate 5, and each mounted on a sleeve 7, crossed by one of the columns 4 ensuring the fixing above the fixed plate 1 of two fixed crosspieces 8.
  • Each sleeve 7 is received in a hole in the corresponding tab 6 and has at its lower end an external radial flange 9 housed in a counterbore surrounding the hole in the tab 6 on its underside.
  • the bottom of each sleeve 7 has a guide bore on a column 4 and a spring 10, surrounding the column 4, bears against the fixed plate 1 and against the bottom of the sleeve 7 to raise the pressure plate 5 above the plate fixed 1.
  • the rods of the cylinders 11 carry, at their end lower free, spherical caps 12 supported in imprints of corresponding shapes formed on the upper face of the pressure plate 5.
  • the latter also has a central circular opening 13, coaxial with the central opening 2 of the fixed plate 1, but of section lower than this.
  • a circular groove 14, corresponding to the layout of the sheets to be cut, is provided in the underside of the pressure plate 5, and opens directly above the opening 2 of the fixed plate 1, as shown in the figure. 3.
  • suction nozzles 16 communicating with an annular channel 17 machined in the pressure plate 5 and capable of being itself placed in communication with a source of vacuum (not shown), open onto the underside of the pressure plate 5.
  • These nozzles 16 are produced by fine holes in a sheet metal closing the annular channel on the underside of the plate 5.
  • the packaging and pleating head 22 is in the form of a circular crown coaxial with the central opening 13 of the pressure plate 5, and of an external diameter less than the diameter of the opening 13.
  • the lower face of this head 22 has a slightly frustoconical general shape and has a radial toothing 23, the suspension lugs 20 are attached to the upper face of the movable head 22 by bent ears 24 so that the operation of the jacks 19 makes it possible to move the movable head 22 through the central opening 13 of the presser plate 5, to bring it to cooperate with a packing head and fixed lower creasing 25.
  • the latter is also in the form of a circular ring coaxial with the central openings 2 and 13 of the fixed plates 1 and presser 5 and the movable head 22. Its external diameter is slightly greater than that of the opening 13 of the presser plate 5, and its upper face, inclined towards its central opening 26, which is the same diameter as the central opening 27 of the movable head 22, has a slightly frustoconical female shape, complementary to the male frustoconical shape of the underside of the movable head 22, as well as a radial toothing 28, complementary with the play of that 23 of the movable head 22,
  • the fixed head 25 is disposed under the fixed plate 1, so that the periphery of its upper face is located in the opening 2.
  • the lower face of the fixed head 25 is extended by a socket in two parts 29 and 30, coaxial with the openings, 2, 13, 26 and 27 respectively of the plates 1 and 5 and the heads 25 and 22, and of the same internal diameter as the openings 26 and 27, and which corresponds to a diameter slightly greater than that of the cylindrical objects to wrap.
  • a ring 31 is rotatably mounted around the upper part 29 of the sleeve, thanks to a bearing 87 supported by a spacer 32 bearing on the edge of a central opening of a fixed upper horizontal deck 33 carried by four uprights 34 plumb with a fixed horizontal lower deck 35.
  • the ring 31 is driven by a belt 36 passing through the groove of a pulley 37 mounted on the axis of a motor 38, suspended under the deck 33.
  • the rotating ring 31 carries a radial arm 39, shown in more detail in FIG. 5.
  • This arm 39 is provided, at its internal end, with a curved foot 40, by which the arm 39 is screwed onto the face upper of the ring 31, and at its outer end, of a support 41, on which a yoke 42 is pivotally mounted about a substantially radial axis 43 perpendicular to the axis of rotation of the ring 31.
  • a roller 44 is rotatably mounted in the yoke 42 around a fixed radial axis 45 and also perpendicular to the 'axis of rotation of the ring 31, so that the roller 44 can roll on a flat ring 47, mounted with play around the ring 31, when the latter is rotated.
  • a cutting blade 46 is secured to the external part of the yoke 42, and points upwards.
  • the flat ring 47 rests by three imprints of its lower face on spherical caps 48 carried at the free upper end of the rods of three jacks 49 suspended from the deck 33 by their cylinders and the flat ring 47 is recalled towards this deck 33 by three tension springs 50.
  • a diaphragm device 51 is located between the two parts 29 and 30 of the sleeve. and fixed under the apron 33.
  • This diaphragm device of the so-called “iris type” is known per se, and comprises a rotary disc provided with slots in spiral portions in each of which engages a stud fixed to a radially movable rod. and ending with a blade, the different blades overlapping in scales, so that in the open position of the diaphragm, these blades are separated and completely clear the axial passage of the sleeve, while in the closed position, the blades determine a limited axial passage.
  • This device well known, and whose rotating disc is moved by a jack, is not shown in detail.
  • a circular support plate 52 of section slightly smaller than that of the sleeve, is carried at the free upper end of the rod of a long-stroke rectilinear axial cylinder 53, the cylinder of which is suspended under the lower apron 35
  • Under the support plate 52 is suspended a flattened counter-rod 54 parallel to the cylinder rod 53, and passing through a lumen 55 formed in the deck 35 and in a stirrup 56, carrying a blocking cylinder 57 capable to immobilize the counter rod 54, and therefore the support plate 52, by the exit of its rod applying a brake piston 58 against a flat part of this counter rod 54, itself clamped against a branch of the stirrup 56.
  • the jack 53 raises the support plate 52 so that its upper surface is at the level of the opening 26 of the fixed packing and pleating head 25, while in the maximum retracted rod position, the upper surface of this support plate 52 is brought to the ni calf of an evacuation slide 59, practically joining the plate 52 by a circular cut.
  • An ejection pusher 60 maneuvered by an ejection cylinder 61, the cylinder of which is clamped on a crosspiece 62 between two uprights 34, allows the transfer onto the evacuation slide 59 of any object carried by the support plate 52 in its lower position.
  • Two lateral forks 63 pivotally mounted about a horizontal and transverse axis 64 by their lower ends, and each retained in a clevis 65 displaced longitudinally ment by a jack 66 articulated on the lower apron 35, surround each of their teeth a stud 67, projecting laterally, of a clamp 68, whose body 69 is sliding longitudinally along two rails 70, whose lower jaw 71 is received in the corresponding groove 3 of the fixed plate 1, and the upper jaw 72 of which carries a jack 73 pinching against the lower jaw 71.
  • the pair of pliers 68 with the forks 63 and the operating jacks 66 constitute an advance device step by step a strip of packaging material introduced between the fixed plates 1 and presser 5, and of which a length useful for cutting a circular packaging sheet is unwound by a transverse rocker 74, pivotally mounted by its lateral arms on fasteners 75 secured to the upper deck 33, and maneuvered by a jack (not shown) in synchronism with a braking device of a unwinding drum 76 mounted on a transverse axis.
  • a bracket 78 supports two rectilinear and parallel jacks, one of which is eccentric and carries, at the free lower end of its rod, a pusher in the form of annular piston 80, capable of being lowered into the bushing to a level slightly below the diaphragm 51, and the other 81 of which is axial and carries at the free lower end of its rod a sealing member 82 which can pass through the annular piston 80, and which is a soldering iron, if the packaging material is heat-sealable, or a label holder of known type, otherwise, which dispenses the labels one by one.
  • the rods of the jacks 79 and 81 pass through their cylinder right through, in two dice 83 are keyed at their upper end. These dice 83 are each provided with a rectangular notch which embraces one side of a vertical rectangular guide bar 84, fixed between the heads of the cylinders of the jacks 79 and 81, so that their rods cannot rotate around them. respective axes.
  • the machine operates as follows: the strip 85 of the flexible packaging material is unwound from the drum 76 passing over a guide roller 77, by the operation of the rocker 74, which releases the brake of the drum 76 while the clamps 68 hold the strip 85 on the fixed plate 1. After a back and forth movement, the rocker 74 has unrolled a length sufficient for cutting a sheet, and this length is driven and held by the step-by-step advance device between the raised pressure plate 5 and the fixed plate 1, while the brake of the drum 76 is applied. The pressing plate 5 is then lowered by the jacks 11 against the band 85 which it clamps on the fixed plate 1, while the movable head 22 remains raised.
  • the suction nozzles 16 press against the pressure plate 5 a portion of the strip 85 covering the opening 2 of the fixed plate 1, so as to tighten the strip 85.
  • the cutting blade 46 driven in rotation with the rotating ring 31 around the fixed head 25, is then lifted by lifting the flat ring 47 controlled by the jacks 49, which causes the blade 46 to pass through the opening 2 of the fixed plate 1, and to engage in the groove 14 of the pressure plate 5, by cutting without burrs in the strip 85 a circular packaging sheet.
  • the jacks 49 and the springs 50 recall the flat ring 47 downwards, which brings the cutting blade 46 back to the rest position, released from the groove 14.
  • the mobile packing and pleating head 22 is then lowered by the jacks 19 onto the fixed head 25. Thanks to its lost-stroke suspension, the mobile head 22, at the end of its travel, only rests by its weight on the head fixed 25 by pinching the sheet on it, without tearing or creasing it.
  • the cooperating teeth 23 and 28 of the packaging and pleating heads 22 and 25 thus initiate pleating of the periphery of the sheet, while the central part of this sheet closes the opening 26 of the fixed head 25, and is located supported by the support plate 52 raised in the high position.
  • An object to be packaged such as a cheese
  • an automatic device for example of the well-known type with suction cup
  • the jack 79 controls then the descent of the annular piston 80, which is applied against the upper face of the object, then pushes it with the sheet that the object covers with its lower face in the socket by pushing the support plate 52 , the jack 53 then being supplied at low pressure.
  • the periphery of the sheet slides between the teeth of the heads 22 and 25, then along the internal lateral surface of the sleeve.
  • the annular piston 80 When the annular piston 80 has completed its entire stroke, the upper face of the object is positioned slightly under the diaphragm 51, and the locking cylinder 57 controls the immobilization of the support plate 52 in the corresponding position.
  • the maximum stroke of the annular piston 80 being defined, it is the thickness of the object which thus determines the position in which the support plate 52 is locked.
  • the annular piston 80 is then removed from the sleeve, and the diaphragm 31 is closed by folding the periphery of the sheet which projects above the object on the upper face of the latter, accentuating the pleating of this already primed sheet. by the cooperating teeth of the heads 22 and 25.
  • the diameter of the axial passage delimited by the closed diaphragm 51 is comparable to that of the annular piston 80, so that the descent of the sealing member, controlled by the jack 81, allows close the closed packaging around the object with the sheet regularly folded and folded over this object.
  • the pleated packaging sheet may be made of heat-sealable plastic, of paper, or of metal (aluminum) coated with such a material. This sheet can also be made of plain paper, and the sealing can then be ensured by the application of a label supplied by a distributor associated with a head. suitable, mounted at the lower end of the cylinder rod 81. It is also possible that a label is deposited on the heat-sealed closure of the packaging.
  • the sealing member 82 is raised to the initial position, and the movable head 22 and the pressure plate 5 can also be raised to the initial position, following a stroke which, although small (for example 10 mm), is clearly sufficient for the step-by-step advance device to be able to position and block on the fixed plate 1 a new length of strip of packaging material, previously unwound by the rocker 74, and necessary for cutting a new sheet, the cut strip 85 being taken up by a friction reel or force limiter drum (not shown) driven in rotation.
  • the blocking cylinder 57 releases the counter rod 54 and the support plate 52 is brought back by the cylinder 53 to the lower position (shown in dotted lines in FIG. 2).
  • the ejection cylinder 61 then operates the ejection pusher 60, which transfers the packaged object 86 to the evacuation slide 59, then returns to the initial position, and the support plate 52 is then brought back to the high position, at the opening 26 of the head 25 for a new cycle.
  • the invention is not limited to the embodiment which has just been described. It is possible, for example, to replace the jaw clamps of the step-by-step advancement device with clamps with electromagnetic operation and movable back and forth along the grooves 3 of the fixed plate 1. In known manner, these clamps can also be replaced by intermittently rotating rollers. Similarly, the movement of the flat ring 47 can be ensured by a fork control. It should be noted that the vertical displacement bringing the cutting blade into the cutting position can also be ensured by an electromagnet disposed on the radial arm driven by the rotating ring or by a small jack, for example pneumatic. In addition, the automatic object feeding device which can be associated with the machine, must be adapted to the nature and consistency of the objects. For hard objects.
  • a clamp device such as that described and represented in FIGS. 1 and 3 in French patent No. 2,217,215 in the name of the Applicant, can perfectly replace the suction cup device for transferring objects from a feed conveyor to the packing and pleating heads 22 and 25.
  • a bucket and gripper device as described and shown in the figures in French patent No. 2,412,463, also in the name, will be used. Applicant.
  • the machine according to the present invention makes it possible, on a single station, to cut the packaging sheets and to pack the objects in these sheets. It is possible, by means of the machine according to the present invention, to pack not only products such as cheeses, tapes of sticky paper or of typewriter, or deodorant blocks already mentioned, but also to pack in pleated sheets, possibly transparencies, pots, boxes and other fragile objects made of glass, earth, sandstone, in particular to protect their labeling or closures.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Packaging Of Special Articles (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Wrapping Of Specific Fragile Articles (AREA)
  • Making Paper Articles (AREA)
  • Wrappers (AREA)
  • Basic Packing Technique (AREA)

Abstract

1. Machine for packaging substantially cylindrically shaped objects in sheets each cut out along a closed, preferably circular contour, from a web (85) of a supple packaging materila, comprising a fixed packaging head (25) and a mobile packaging head (22) in the form of two rings of common axis, capable of gripping therebetween a packaging sheat when the mobile head (22) is brought against the fixed head (25), and of which the central openings (26, 27) are coaxial, at least one bush (29, 30) disposed the line the central opening (26) of the fixed packaging head (25) and connected to that face of the latter which is not turned towards the mobile packaging head (22), a mobile pusher (80) making it possible to push an object to be packaged and the sheet on which it has been disposed, inside the bush (29, 30) up to a bearing plate (52) perpendicular to the axis of the bush (29, 30), a diaphragm device (51) making it possible, by partial obturation of the bush (29, 30), to fold the packaging sheet down on one of the faces of the object resting on the bearing plate (52), a sealing member (82) being introduced into the bush (29, 30) and applied, through the diaphragm (51), on the part of the packaging sheet folded on the object which rests against the bearing plate (52), after withdrawal of the mobile pusher (80) from the bush (29, 30), characterized in that it also comprises, on the one hand, for gripping the web (85) of supple packaging material, a fixed plate (1) presenting a central opening (2) of which the shape corresponds to that of the contour of the sheets, and of which the section is slightly greater than that of the sheets to be cut out, as well as a mobile presser plate (5), parallel to the fixed plate (1) and presenting on its face opposite the latter a groove (14) having the form of the contour of the sheets and corning opposite the central opening (2) of the fixed plate (1) when the presser plate (5) is applied against the latter, the presser plate (5) also presenting a central opening (13) inside the groove (14) allowing the passage of the mobile packaging head (22) and, on the other hand, for cutting out a sheet from a web (85) pressed between the fixed plate (1) and the presser plate (5), a system (31, 39) mobile along the contour of the sheets about the fixed packaging head (25) projecting inside the central opening (2) of the fixed plate (1) and a cutting tool (46), borne by the mobile system (31, 39) and movable in a direction perpendicular to the fixed and presser plates (1 and 5) respectively, between a cut-out position, in which the tool (46) traverses the central opening (2) of the fixed plate (1) and is engaged in the groove (14) of the presser plate (5), and a rest position in which the tool (46) is at least disengaged from the groove (14) of the presser plate (5).

Description

L'invention concerne les machines à emballer des objets de forme sensiblement cylindrique, tels que fromages, rubans enroulés de papier collant ou pour machine à écrire, blocs désodorisants pour sanitaires etc.... et a plus particulièrement pour objet les machines emballant ces objets dans des feuilles découpées selon les contours fermés, de préférence convexes, tels que des disques circulaires, dans des bandes de matériau souple d'emballage, tel que le papier, l'aluminium et des pellicules de matière plastique transparente ou non et éventuellement thermosoudable, la feuille d'emballage pouvant de préférence être régulièrement plissée sur le pourtour de l'objet.The invention relates to machines for packaging objects of substantially cylindrical shape, such as cheeses, ribbons wound with sticky paper or for a typewriter, deodorant blocks for sanitary facilities, etc., and more particularly relates to machines for packaging these objects in sheets cut according to closed contours, preferably convex, such as circular discs, in strips of flexible packaging material, such as paper, aluminum and films of transparent or non-transparent plastic material and possibly heat-sealable, the packaging sheet can preferably be regularly pleated around the periphery of the object.

Par le document FR-A-2 225 336 au nom du Demandeur, on connaît déjà une machine à emballer de tels objets dans des feuilles souples découpées selon un contour fermé, du type énoncé dans le préambule de la revendication 1. Une telle machine comprend une tête d'emballage fixe et une tête d'emballage mobile, .se présentant sous !a forme de deux couronnes d'axes communs, susceptibles d'enserrer entre elles une feuille d'emballage lorsqu'elles sont amenées l'une contre l'autre, et dont les ouvertures centrales sont coaxiales avec au moins une douillé pour le passage des objets à emballer, disposée dans le prolongement de l'ouverture centrale de la tête d'emballage fixe et rattachée à la face de cette dernière qui n'est pas tournée vers la tête d'emballage mobile. De plus un dispositif à diaphragme vient partiellement obturer la douille en rabattant la feuille d'emballage sur l'une des faces d'un objet, après que ce dernier ait été disposé par son autre face contre la partie de la feuille obturant les ouvertures centrales des têtes d'emballage appliquées t'une contre l'autre, puis poussé avec cette feuille dans la douille par un poussoir mobile, jusqu'à venir reposer contre une plaque d'appui perpendiculaire à l'axe de la douille. Un organe de scellement est introduit dans la douille et appliqué au travers du diaphragme sur la partie de !a feuille d'emballage rabattue sur l'objet reposant contre la plaque d'appui, après le retrait du poussoir mobile hors de la douille.From document FR-A-2 225 336 in the name of the Applicant, there is already known a machine for packaging such objects in flexible sheets cut according to a closed contour, of the type stated in the preamble of claim 1. Such a machine comprises a fixed packaging head and a movable packaging head, in the form of two crowns of common axes, capable of enclosing a packaging sheet between them when they are brought one against the other. 'other, and whose central openings are coaxial with at least one socket for the passage of the objects to be packed, arranged in the extension of the central opening of the fixed packaging head and attached to the face of the latter which does not is not turned towards the movable packing head. In addition, a diaphragm device partially seals the sleeve by folding the packaging sheet over one of the faces of an object, after the latter has been disposed by its other face against the part of the sheet closing the central openings. packing heads applied against each other, then pushed with this sheet into the socket by a movable plunger, until it comes to rest against a support plate perpendicular to the axis of the socket. A sealing member is introduced into the sleeve and applied through the diaphragm to the part of the packaging sheet folded over the object resting against the support plate, after the movable pusher has been withdrawn from the sleeve.

Dans ce brevet français, les têtes d'emballage sont munies sur leurs faces en regard, de dentures radiales complémentaires, pour amorcer un plissage d'une feuille qu'elles enserrent, de façon à emballer l'objet dans une feuille plissée à sa périphérie, l'axe commun aux têtes d'emballage et à la douille étant vertical, et la tête mobile étant disposée au-dessus de la tête fixe.In this French patent, the packaging heads are provided on their opposite faces with complementary radial teeth, to initiate a pleating of a sheet which they enclose, so as to pack the object in a pleated sheet at its periphery , the axis common to the packaging heads and to the sleeve being vertical, and the movable head being disposed above the fixed head.

Les machines à emballer de ce type doivent être alimentées d'une part en objets à emballer, d'autre part en feuilles découpées, soit manuellement soit automatiquement pour l'une et/ou l'autre de ces opérations.Packing machines of this type must be supplied on the one hand with objects to be packaged, on the other hand with cut sheets, either manually or automatically for one and / or the other of these operations.

Avantageusement, cependant, pour assurer automatiquement le découpage et l'alimentation en feuilles découpées de la machine à emballer. on peut utiliser une machine à découper des feuilles minces selon des contours fermés dans des bandes de matériau d'emballage, telle que décrite dans le document FR-A-2 212734 au nom du Demandeur, et comprenant, d'une part, pour enserrer une bande de matériau d'emballage, deux plateaux, dont l'un est fixe et comporte une fente ayant la forme du contour fermé à découper, et dont l'autre est mobile et comporte une rainure sur la face en regard du premier, cette rainure venant se superposer à la fente selon le contour fermé, lorsque les deux plateaux sont appliqués l'un contre l'autre, et, d'autre part, pour la découpe de cette feuille, un outil tranchant, porté par un équipement mobile suivant le tracé du contour fermé, et déplaçable dans une direction perpendiculaire aux plateaux entre une position de découpe dans laquelle l'outil traverse la fente et se trouve engagé dans la rainure, et une position de repos dans laquelle l'outil n'est pas engagé dans la rainure.Advantageously, however, to automatically ensure the cutting and feeding of cut sheets of the packaging machine. one can use a machine for cutting thin sheets according to closed contours in strips of packaging material, as described in document FR-A-2 212734 in the name of the Applicant, and comprising, on the one hand, for enclosing a strip of packaging material, two trays, one of which is fixed and has a slot having the shape of the closed contour to be cut, and the other of which is mobile and has a groove on the opposite face of the first, this groove coming to be superimposed on the slot along the closed contour, when the two plates are applied one against the other, and, on the other hand, for cutting this sheet, a cutting tool, carried by a following mobile equipment the outline of the closed contour, and movable in a direction perpendicular to the plates between a cutting position in which the tool crosses the slot and is engaged in the groove, and a rest position in which the tool is not engaged in the groove.

Lorsque le contour fermé, commun à la fente et à la rainure est circulaire, le plateau fixe est constitué d'un disque circulaire central entouré d'une plaque fixe et porté par un arbre fixe, servant de pivot pour le déplacement de l'équipage mobile et de guide pour le déplacement perpendiculaire au plateau de l'outil tranchant.When the closed contour, common to the slot and the groove is circular, the fixed plate consists of a central circular disc surrounded by a fixed plate and carried by a fixed shaft, serving as a pivot for the movement of the crew mobile and guide for the movement perpendicular to the cutting tool plate.

Pour assurer le maintien d'une feuille découpée sur le plateau fixe lors du recul du plateau mobile, il est prévu des buses d'aspiration dans le disque central, ces buses étant reliées à une chambre de dépression aménagée dans ce disque, et mises en communication avec une pompe à vide. Ensuite, le transfert de la feuille découpée de la machine à découper sur la machine à emballer est assuré par le coulissement, sur au moins une glissière allant de l'une à l'autre de ces machines, d'un palpeur à ventouses, porté par un bras tubulaire, et susceptible de se déplacer entre une position intérieure au contour, dans laquelle il est engagé dans une encoche du plateau mobile et mis en communication avec la source de dépression alors que la liaison de cette dernière avec les buses est coupée, et une position extérieure au contour, à l'aplomb de la tête inférieure de plissage et d'emballage de la machine à emballer associée, sur laquelle la feuille découpée est déposée dès que la liaison avec la source de dépression est coupée.To ensure the maintenance of a cut sheet on the fixed plate during the retraction of the movable plate, there are provided suction nozzles in the central disc, these nozzles being connected to a vacuum chamber arranged in this disc, and put in communication with a vacuum pump. Then, the transfer of the cut sheet from the cutting machine to the packaging machine is ensured by the sliding, on at least one slide going from one to the other of these machines, of a suction probe, carried by a tubular arm, and capable of moving between a position inside the contour, in which it is engaged in a notch of the movable plate and placed in communication with the source of vacuum while the connection of the latter with the nozzles is cut, and a position outside the contour, plumb with the lower pleating and packaging head of the associated packaging machine, on which the cut sheet is deposited as soon as the connection with the vacuum source is cut.

Enfin, pour éviter l'accrochage et l'entraînement de la bande dans laquelle la feuille a été découpée, par cette dernière lors de son transfert d'une machine à l'autre, il est également prévu des buses d'aspiration sur la plaque fixe de la machine à découper, à proximité et autour de la fente, le fonctionnement de ces buses devant être synchronisé avec l'avance pas à pas de la bande du matériau d'emballage sur le plateau fixe de la machine à découper.Finally, to avoid catching and entraining of the strip in which the sheet has been cut, by the latter during its transfer from one machine to another, there are also provided suction nozzles on the plate stationary cutting machine, near and around the slot, the operation of these nozzles to be synchronized with the step by step advance of the strip of packaging material on the fixed plate of the cutting machine.

Il est clair que la cadence maximale de fonctionnement d'une installation associant les deux machines précitées est déterminée à partir de la plus faible des cadences maximales de ces deux machines, et en prenant en compte la durée non négligeable du transfert d'une feuille découpée de la machine à découper à la machine à emballer, ce qui constitue une limitation importante au fonctionnement d'une telle installation, en particulier pour les disques de grand diamètre, qui peuvent s'accrocher au mécanisme d'avance de la bande du matériau d'emballage sur le plateau fixe de la machine à découper. De plus une telle installation est encombrante et délicate à régler puisque les deux machines associées doivent fonctionner en synchronisme.It is clear that the maximum rate of operation operation of an installation associating the two aforementioned machines is determined from the lowest of the maximum rates of these two machines, and taking into account the significant duration of the transfer of a cut sheet from the cutting machine to the machine to be packaged, which constitutes a significant limitation in the operation of such an installation, in particular for large diameter discs, which can cling to the mechanism for advancing the strip of packaging material on the fixed plate of the cutting machine. In addition, such an installation is bulky and difficult to adjust since the two associated machines must operate in synchronism.

Par la présente invention on se propose de remédier à ces divers inconvénients, au moyen d'une unique machine, remplissant les deux fonctions de découpe et d'emballage de préférence avec plissage, la machine selon l'invention étant de plus d'un encombrement limité, d'une structure et d'un réglage simplifiés, et autorisant des cadences accrues du fait notamment de la suppression de toute phase de transfert des feuilles découpées d'un poste à un autre. Cette machine selon l'invention permet également de découper des feuilles de grande surface et d'emballer des objets volumineux tout en présentant une structure simple.By the present invention it is proposed to remedy these various drawbacks, by means of a single machine, fulfilling the two functions of cutting and packaging, preferably with pleating, the machine according to the invention being more than a space requirement. limited, of a simplified structure and adjustment, and authorizing increased rates due in particular to the elimination of any phase of transfer of the cut sheets from one station to another. This machine according to the invention also makes it possible to cut large area sheets and to pack bulky objects while having a simple structure.

A cet effet l'invention a pour objet une machine à emballer des objets de forme sensiblement cylindrique dans des feuilles découpées chacune selon un contour fermé, de préférence circulaire, dans une bande d'un matériau souple d'emballage fixe et une tête d'emballage mobile se présentant sous la forme de deux couronnes d'axe commun, susceptibles d'enserrer entre elles une feuille d'emballage lorsque la tête mobile est amenée contre la tête fixe et dont les ouvertures centrales sont coaxiales, au moins une douille disposée dans le prolongement de l'ouverture centrale de la tête d'emballage fixe et rattachée à la face de cette dernière qui n'est pas tournée vers la tête d'emballage mobile, un poussoir mobile permettant de pousser un objet à emballer et la feuille sur laquelle il a été disposé, à l'intérieur de la douille jusqu'à une plaque d'appui perpendiculaire à l'axe de la douille, un dispositif de diaphragme permettant par obturation partielle de la douille de rabattre la feuille d'emballage sur l'une des faces de l'objet reposant sur la plaque d'appui, un organe de scellement étant introduit dans la douille et appliqué, au travers du diaphragme, sur la partie de la feuille d'emballage rabattue sur l'objet qui repose contre la plaque d'appui, après retrait du poussoir mobile hors de la douille.To this end, the subject of the invention is a machine for packaging objects of substantially cylindrical shape in sheets each cut according to a closed contour, preferably circular, in a strip of a fixed flexible packaging material and a head of mobile packaging in the form of two crowns of common axis, capable of enclosing between them a packaging sheet when the mobile head is brought against the fixed head and whose central openings are coaxial, at least one socket disposed in the extension of the central opening of the fixed packaging head and attached to the face of the latter which is not turned towards the mobile packaging head, a mobile pusher making it possible to push an object to be packaged and the sheet onto which has been arranged, inside the sleeve up to a support plate perpendicular to the axis of the sleeve, a diaphragm device allowing by partial sealing of the sleeve to fold the sheet of packaging on one side of the object resting on the support plate, a sealing member being introduced into the socket and applied, through the diaphragm, to the part of the packaging sheet folded over the object which rests against the support plate, after removal of the movable pusher from the socket.

La machine du type ci-dessus indiqué est, selon l'invention, caractérisée en ce qu'elle comprend, d'une part, pour enserrer la bande de matériau souple d'emballage, un plateau fixe présentant une ouverture centrale dont la forme correspond à celle du contour des feuilles, et dont la section est légèrement supérieure à celle des feuilles, ainsi qu'un plateau presseur mobile, parallèle au plateau fixe et présentant sur sa face en regard de ce dernier une gorge ayant la forme du contour des feuilles et venant en face de l'ouverture centrale du plateau fixe lorsque le plateau presseur est appliqué contre ce dernier, le plateau presseur présentant également une ouverture centrale interne à la gorge, autorisant le passage de la tête d'emballage mobile, et, d'autre part, pour la découpe d'une feuille dans une bande pressée entre le plateau fixe et le plateau presseur, un équipage mobile suivant le contour des feuilles autour de la tête d'emballage fixe faisant saillie à l'intérieur de l'ouverture centrale du plateau fixe, et un outil tranchant, porté par l'équipage mobile et déplaçable dans une direction perpendiculaire aux plateaux fixe et presseur entre une position de découpe, dans laquelle l'outil traverse l'ouverture centrale du plateau fixe et se trouve engagé dans la gorge du plateau presseur, et une position de repos dans laquelle l'outil est au moins dégagé de la gorge du plateau presseur.The machine of the type indicated above is, according to the invention, characterized in that it comprises, on the one hand, for gripping the strip of flexible packaging material, a fixed plate having a central opening whose shape corresponds to that of the outline of the leaves, and whose section is slightly greater than that of the leaves, as well as a movable pressure plate, parallel to the fixed plate and having on its face opposite the latter a groove having the shape of the contour of the leaves and coming opposite the central opening of the fixed plate when the pressure plate is applied against the latter, the pressure plate also having a central opening internal to the groove, allowing the passage of the movable packaging head, and, on the other hand, for cutting a sheet from a strip pressed between the fixed plate and the pressure plate, a movable element following the outline of the sheets around the fixed packaging head projecting inside the opening central structure of the fixed plate, and a cutting tool, carried by the mobile assembly and movable in a direction perpendicular to the fixed plates and presser between a cutting position, in which the tool crosses the central opening of the fixed plate and is located engaged in the groove of the pressure plate, and a rest position in which the tool is at least released from the groove of the pressure plate.

Dans une forme préférée de réalisation, dont la structure est simple, l'outil tranchant est solidaire d'une chape montée pivotante sur l'extrémité externe du bras radial, autour d'un axe radial perpendiculaire à l'axe de rotation de la bague tournante, et un galet est monté en rotation dans la chape autour d'un second axe radial, perpendiculaire à l'axe de rotation de la bague, pour rouler sur un anneau entourant avec du jeu la bague tournante, et déplaçable en translation selon l'axe de rotation de la bague, afin de commander la position de l'outil tranchant.In a preferred embodiment, the structure of which is simple, the cutting tool is integral with a yoke pivotally mounted on the outer end of the radial arm, around a radial axis perpendicular to the axis of rotation of the ring rotating, and a roller is mounted in rotation in the yoke around a second radial axis, perpendicular to the axis of rotation of the ring, to roll on a ring surrounding with play the rotating ring, and displaceable in translation along the 'axis of rotation of the ring, in order to control the position of the cutting tool.

La position axiale de l'anneau, qui commande la position de l'outil tranchant, est elle-même commandée par des vérins vers lesquels l'anneau est élastiquement rappelé.The axial position of the ring, which controls the position of the cutting tool, is itself controlled by jacks to which the ring is resiliently biased.

Dans une forme préférée de réalisation, et afin de faciliter la découpe d'une feuille, le plateau presseur présente, sur sa face en regard du plateau fixe, et entre sa gorge et son ouverture centrale, une pluralité de buses d'aspiration débouchant dans au moins un canal annulaire mis en communication avec une source de dépression, pour plaquer la partie de la bande du matériau souple d'emballage obturant l'ouverture centrale du plateau fixe contre le plateau presseur.In a preferred embodiment, and in order to facilitate the cutting of a sheet, the pressure plate has, on its face opposite the fixed plate, and between its groove and its central opening, a plurality of suction nozzles opening into at least one annular channel placed in communication with a vacuum source, to press the part of the strip of flexible packaging material closing the central opening of the fixed plate against the pressure plate.

De préférence, d'une façon en soi connue, la bande de matériau souple est maintenue et déplacée entre le plateau fixe et le plateau presseur par un dispositif d'avance pas à pas, comprenant au moins une paire de pinces, susceptible d'être déplacées sur des glissières le long du plateau fixe par au moins une fourchette, montée pivotante autour d'un axe transversal à la direction de déplacement de la bande sur le plateau fixe, et manoeuvrée par un vérin.Preferably, in a manner known per se, the strip of flexible material is held and moved between the fixed plate and the pressure plate by a step-by-step feed device, comprising at least one pair of pliers, capable of being moved on slides along the fixed plate by at least one fork, pivotally mounted around an axis transverse to the direction of movement of the strip on the fixed plate, and operated by a jack.

Dans une forme préférée de réalisation, les faces en regard des têtes d'emballage sont munies de dentures radiales complémentaires pour amorcer un plissage d'une feuille qu'elles enserrent, de façon à emballer l'objet dans une feuille plissée à sa périphérie, l'axe commun aux têtes d'emballage et à la douille étant vertical, la tête mobile étant disposée au-dessus de la tête fixe, de même le plateau presseur est disposé au-dessus du plateau fixe.In a preferred embodiment, the facing faces of the packaging heads are provided with complementary radial teeth to initiate pleating of a sheet which they enclose, so as to pack the object in a pleated sheet at its periphery, the axis common to the packaging heads and the sleeve being vertical, the movable head being disposed above the fixed head, likewise the pressure plate is disposed above the fixed plate.

Selon l'invention la tête d'emballage mobile de la machine est suspendue à course perdue, sur les tiges de vérins montés sur des portiques solidaires du plateau presseur mobile, de part et d'autre de la tête d'emballage mobile, au moyen de pattes diamétralement opposées présentant des ouvertures que traversent les tiges de vérins dont les extrémités portent des butées d'entraînement des pattes, qui sont conformées en oreilles contre coudées pour se raccorder à la face de la tête mobile non tournée vers la tête fixe.According to the invention, the mobile packaging head of the machine is suspended with lost travel, on the rods of jacks mounted on gantries secured to the mobile pressure plate, on either side of the mobile packaging head, by means diametrically opposite lugs having openings through which the rods of jacks whose ends carry lug drive stops, which are shaped in ears against bent to connect to the face of the movable head not turned towards the fixed head.

Selon une autre caractéristique de l'invention, le plateau presseur mobile est monté coulissant le long de colonnes reliant au plateau fixe des traverses fixes portant des vérins de commande du déplacement du plateau presseur vers le plateau fixe, par leurs tiges munies à leur extrémité libre de calottes sphériques coopérant avec des empreintes du plateau ' presseur mobile, lequel est rappelé élastiquement vers les traverses fixes par des ressorts prenant appui d'une part contre le plateau fixe, et d'autre part contre le fond de manchons portés par des pattes latérales du plateau presseur et traversés avec guidage par les colonnes.According to another characteristic of the invention, the movable pressure plate is mounted sliding along columns connecting fixed plates to the fixed plate carrying jacks for controlling the movement of the pressure plate towards the fixed plate, by their rods provided at their free end. of spherical caps cooperating with imprints of the mobile presser plate, which is resiliently biased towards the fixed crosspieces by springs bearing on the one hand against the fixed plate, and on the other hand against the bottom of sleeves carried by lateral tabs of the pressure plate and crossed with guidance by the columns.

Selon une autre caractéristique propre à l'invention, la plaque d'appui est montée à l'extrémité d'une tige d'un vérin et peut être introduite par ce dernier dans la douille, jusqu'à ce que sa surface d'appui soit au niveau de l'ouverture centrale de la tête d'emballage fixe, puis repoussée avec l'objet par le poussoir-mobile, dont la course est limitée de sorte que l'objet soit introduit dans la douille au-delà du dispositif à diaphragme, la plaque d'appui étant immobilisée dans cette position par un système de blocage le temps des opérations du dispostif à diaphragme et de l'organe de scellement, puis déplacée pour sortir l'objet emballé de la douille et le placer sur la trajectoire d'un organe d'éjection amenant l'objet sur un poste d'évacuation.According to another characteristic specific to the invention, the support plate is mounted at the end of a rod of a jack and can be introduced by the latter into the socket, until its bearing surface either at the central opening of the fixed packaging head, then pushed back with the object by the pusher-mobile, the stroke of which is limited so that the object is introduced into the socket beyond the device to diaphragm, the support plate being immobilized in this position by a locking system during the operations of the diaphragm device and of the sealing member, then moved to remove the wrapped object from the sleeve and place it on the path an ejection member bringing the object to an evacuation station.

D'une façon en soi connue, le poussoir mobile peut se présenter sous la forme d'un piston annulaire déplacé par un vérin excentré par rapport à l'axe des têtes d'emballage, l'organe de scellement étant déplaçable axialement au travers du piston annulaire par un vérin axial parallèle au vérin excentré. L'organe de scellement peut être une tête de soudage, si le matériau souple d'emballage est un matériau thermoplastique, ou un porte étiquettes, venant coiffer l'objet emballé pour déposer sur ce dernier une étiquette auto-collante, dans les autres cas.In a manner known per se, the movable pusher may be in the form of an annular piston moved by a cylinder eccentric relative to the axis of the packaging heads, the sealing member being axially displaceable through the annular piston by an axial cylinder parallel to the eccentric cylinder. The sealing member can be a welding head, if the flexible packaging material is a thermoplastic material, or a label holder, which covers the packaged object to deposit a self-adhesive label on the latter, in other cases .

La présente invention sera mieux comprise, à l'aide d'un exemple particulier de réalisation, qui sera décrit ci-après, à titre non limitatif, en référence aux dessins annexés dans lesquels :

  • la figure 1 représente une vue en perspective éclatée et partiellement coupée d'une machine à emballer,
  • la figure 2 représente une vue en coupe axiale dans un plan parallèle à la direction de déplacement de la bande du matériau d'emballage, de la machine selon la figure 1,
  • la figure 3 représente une coupe selon III-III de la figure 2,
  • la figure 4 représente une coupe partielle selon IV-IV de la figure 2, et
  • la figure 5 représente une vue en perspective d'un outil tranchant monté au bout d'un bras radial destiné à être porté par l'équipage mobile d'une machine selon les figures 1 à 4.
The present invention will be better understood, using a particular embodiment, which will be described below, without limitation, with reference to the accompanying drawings in which:
  • FIG. 1 represents an exploded and partially cut perspective view of a packaging machine,
  • FIG. 2 represents a view in axial section in a plane parallel to the direction of movement of the strip of packaging material, of the machine according to FIG. 1,
  • FIG. 3 represents a section on III-III of FIG. 2,
  • FIG. 4 represents a partial section along IV-IV of FIG. 2, and
  • FIG. 5 represents a perspective view of a cutting tool mounted at the end of a radial arm intended to be carried by the mobile assembly of a machine according to FIGS. 1 to 4.

En référence aux figures 1 à 4, la machine comprend un plateau fixe 1, horizontal et rectangulaire, percé d'une ouverture centrale circulaire 2, de section légèrement supérieure à celle des feuilles circulaires ou disques dans lesquels des objets de forme sensiblement cylindrique, tels que des fromages, doivent être emballés. Ce plateau fixe 1 présente également, le long de la majeure partie de ses grands côtés, deux rainures 3, et à chacun à ses quatre coins, un perçage de montage d'une colonne de guidage verticale 4. Comme cela paraît clairement sur la figure 4, un plateau presseur mobile 5, disposé horizontalement au-dessus du plateau fixe 1, est monté coulissant en direction verticale grâce à quatre pattes latérales 6, solidaires des quatre coins du plateau presseur 5, et montées chacune sur un manchon 7, traversé par l'une des colonnes 4 assurant la fixation au-dessus du plateau fixe 1 de deux traverses fixes 8. Chaque manchon 7 est reçu dans un perçage de la patte 6 correspondante et présente à son extrémité inférieure une collerette radiale externe 9 se logeant dans un lamage entourant le perçage de la patte 6 sur sa face inférieure. Le fond de chaque manchon 7 présente un perçage de guidage sur une colonne 4 et un ressort 10, entourant la colonne 4, prend appui contre le plateau fixe 1 et contre le fond du manchon 7 pour relever le plateau presseur 5 au-dessus du plateau fixe 1. Deux paires de vérins verticaux, fixés par leur cylindre sur les traverses fixes 8, commandent les déplacements du plateau presseur 5 vers le plateau fixe 1, à l'encontre des ressorts 10. Les tiges des vérins 11 portent, à leur extrémité libre inférieure, des calottes sphériques 12 prenant appui dans des empreintes de formes correspondantes pratiquées sur la face supérieure du plateau presseur 5. Ce dernier présente également une ouverture circulaire centrale 13, coaxiale à l'ouverture centrale 2 du plateau fixe 1, mais de section inférieure à celle-ci. De-plus, une gorge circulaire 14, correspondant au tracé des feuilles à découper, est ménagée dans la face inférieure du plateau presseur 5, et débouche à l'aplomb de l'ouverture 2 du plateau fixe 1, comme cela apparaît sur la figure 3. Enfin, entre la gorge 14 et l'ouverture 13, des buses d'aspiration 16, communiquant avec un canal annulaire 17 usiné dans le plateau presseur 5 et susceptible d'être mis lui-même en communication avec une source de dépression (non représentée), débouchent sur la face inférieure du plateau presseur 5. Ces buses 16 sont réalisées par de fins perçages dans une tôle fermant le canal annulaire sur la face inférieure du plateau 5.Referring to Figures 1 to 4, the machine comprises a fixed plate 1, horizontal and rectangular, pierced with a circular central opening 2, of section slightly greater than that of circular sheets or discs in which objects of substantially cylindrical shape, such as only cheeses, must be packaged. This fixed plate 1 also has, along the major part of its long sides, two grooves 3, and each at its four corners, a mounting hole for a vertical guide column 4. As is clearly seen in the figure 4, a movable pressure plate 5, disposed horizontally above the fixed plate 1, is slidably mounted in a vertical direction by means of four lateral tabs 6, integral with the four corners of the pressure plate 5, and each mounted on a sleeve 7, crossed by one of the columns 4 ensuring the fixing above the fixed plate 1 of two fixed crosspieces 8. Each sleeve 7 is received in a hole in the corresponding tab 6 and has at its lower end an external radial flange 9 housed in a counterbore surrounding the hole in the tab 6 on its underside. The bottom of each sleeve 7 has a guide bore on a column 4 and a spring 10, surrounding the column 4, bears against the fixed plate 1 and against the bottom of the sleeve 7 to raise the pressure plate 5 above the plate fixed 1. Two pairs of vertical cylinders, fixed by their cylinder on the fixed crosspieces 8, control the movements of the pressure plate 5 towards the fixed plate 1, against the springs 10. The rods of the cylinders 11 carry, at their end lower free, spherical caps 12 supported in imprints of corresponding shapes formed on the upper face of the pressure plate 5. The latter also has a central circular opening 13, coaxial with the central opening 2 of the fixed plate 1, but of section lower than this. In addition, a circular groove 14, corresponding to the layout of the sheets to be cut, is provided in the underside of the pressure plate 5, and opens directly above the opening 2 of the fixed plate 1, as shown in the figure. 3. Finally, between the groove 14 and the opening 13, suction nozzles 16, communicating with an annular channel 17 machined in the pressure plate 5 and capable of being itself placed in communication with a source of vacuum ( not shown), open onto the underside of the pressure plate 5. These nozzles 16 are produced by fine holes in a sheet metal closing the annular channel on the underside of the plate 5.

Sur la face supérieure du plateau presseur 5, et de part et d'autre de son ouverture centrale 13, sont boulonnés deux portiques transversaux 18, sur chacun desquels est monté le cylindre d'un vérin vertical 19, dont la tige traverse à coulissement une patte longitudinale 20 de suspension d'une tête d'emballage et de plissage supérieure mobile 22, et porte à son extrémité inférieure une butée 21 de levage de cette tête 22, lorsque les vérins 19 sont commandés en rétraction.On the upper face of the pressure plate 5, and on either side of its central opening 13, are bolted two transverse gantries 18, on each of which is mounted the cylinder of a vertical cylinder 19, the rod of which slides slidably longitudinal lug 20 for hanging a movable upper packaging and pleating head 22, and carries at its lower end a stop 21 for lifting this head 22, when the jacks 19 are controlled in retraction.

La tête d'emballage et de plissage 22 se présente sous la forme d'une couronne circulaire coaxiale à l'ouverture centrale 13 du plateau presseur 5, et d'un diamètre externe inférieur au diamètre de l'ouverture 13. La face inférieure de cette tête 22 présente une forme générale légèrement tronconique et porte une denture radiale 23, les pattes de suspension 20 se rattachent à la face supérieure de la tête mobile 22 par des oreilles contre-coudées 24 de sorte que la manoeuvre des vérins 19 permet de déplacer la tête mobile 22 au travers de l'ouverture centrale 13 du 'plateau presseur 5, pour l'amener à coopérer avec une tête d'emballage et de plissage inférieure fixe 25.The packaging and pleating head 22 is in the form of a circular crown coaxial with the central opening 13 of the pressure plate 5, and of an external diameter less than the diameter of the opening 13. The lower face of this head 22 has a slightly frustoconical general shape and has a radial toothing 23, the suspension lugs 20 are attached to the upper face of the movable head 22 by bent ears 24 so that the operation of the jacks 19 makes it possible to move the movable head 22 through the central opening 13 of the presser plate 5, to bring it to cooperate with a packing head and fixed lower creasing 25.

Cette dernière se présente également sous la forme d'une couronne circulaire coaxiale aux ouvertures centrales 2 et 13 des plateaux fixe 1 et presseur 5 et à la tête mobile 22. Son diamètre extérieur est légèrement supérieur à celui de l'ouverture 13 du plateau presseur 5, et sa face supérieure, inclinée vers son ouverture centrale 26, qui est de même diamètre que l'ouverture centrale 27 de la tête mobile 22, présente une forme légèrement tronconique femelle, complémentaire de la forme tronconique mâle de la face inférieure de la tête mobile 22, ainsi qu'une denture radiale 28, complémentaire avec du jeu de celle 23 de la tête mobile 22,The latter is also in the form of a circular ring coaxial with the central openings 2 and 13 of the fixed plates 1 and presser 5 and the movable head 22. Its external diameter is slightly greater than that of the opening 13 of the presser plate 5, and its upper face, inclined towards its central opening 26, which is the same diameter as the central opening 27 of the movable head 22, has a slightly frustoconical female shape, complementary to the male frustoconical shape of the underside of the movable head 22, as well as a radial toothing 28, complementary with the play of that 23 of the movable head 22,

La tête fixe 25 est disposée sous le plateau fixe 1, de sorte que la périphérie de sa face supérieure soit située dans l'ouverture 2. La face inférieure de la tête fixe 25 se prolonge d'une douille en deux parties 29 et 30, coaxiales aux ouvertures, 2, 13, 26 et 27 respectivement des plateaux 1 et 5 et des têtes 25 et 22, et de même diamètre interne que les ouvertures 26 et 27, et qui correspond à un diamètre légèrement supérieur à celui des objets cylindriques à emballer.The fixed head 25 is disposed under the fixed plate 1, so that the periphery of its upper face is located in the opening 2. The lower face of the fixed head 25 is extended by a socket in two parts 29 and 30, coaxial with the openings, 2, 13, 26 and 27 respectively of the plates 1 and 5 and the heads 25 and 22, and of the same internal diameter as the openings 26 and 27, and which corresponds to a diameter slightly greater than that of the cylindrical objects to wrap.

Une bague 31 est montée en rotation autour de la partie supérieure 29 de la douille, grâce à un roulement 87 supporté par une entretoise 32 en appui sur le bord d'une ouverture centrale d'un tablier horizontal supérieur fixe 33 porté par quatre montants 34 à l'aplomb d'un tablier horizontal inférieur fixe 35. La bague 31 est entraînée par une courroie 36 passant dans la gorge d'une poulie 37 montée sur l'axe d'un moteur 38, suspendu sous le tablier 33. A sa partie supérieure, la bague tournante 31 porte un bras radial 39, représenté plus en détail sur la figure 5. Ce bras 39 est muni, à son extrémité interne, d'un pied courbé 40, par lequel le bras 39 est vissé sur la face supérieure de la bague 31, et à son extrémité externe, d'un support 41, sur lequel une chape 42 est montée pivotante autour d'un axe sensiblement radial 43 perpendiculaire à l'axe de rotation de la bague 31. Un galet 44 est monté rotatif dans la chape 42 autour d'un axe fixe 45 radial et également perpendiculaire à l'axe de rotation de la bague 31, de sorte que le galet 44 peut rouler sur un anneau plat 47, monté avec jeu autour de la bague 31, lorsque cette dernière est entraînée en rotation.A ring 31 is rotatably mounted around the upper part 29 of the sleeve, thanks to a bearing 87 supported by a spacer 32 bearing on the edge of a central opening of a fixed upper horizontal deck 33 carried by four uprights 34 plumb with a fixed horizontal lower deck 35. The ring 31 is driven by a belt 36 passing through the groove of a pulley 37 mounted on the axis of a motor 38, suspended under the deck 33. At its upper part, the rotating ring 31 carries a radial arm 39, shown in more detail in FIG. 5. This arm 39 is provided, at its internal end, with a curved foot 40, by which the arm 39 is screwed onto the face upper of the ring 31, and at its outer end, of a support 41, on which a yoke 42 is pivotally mounted about a substantially radial axis 43 perpendicular to the axis of rotation of the ring 31. A roller 44 is rotatably mounted in the yoke 42 around a fixed radial axis 45 and also perpendicular to the 'axis of rotation of the ring 31, so that the roller 44 can roll on a flat ring 47, mounted with play around the ring 31, when the latter is rotated.

Une lame coupante 46 est solidarisée sur la partie externe de la chape 42, et pointe vers le haut. L'anneau plat 47 repose par trois empreintes de sa face inférieure sur des calottes sphériques 48 portées à l'extrémité supérieure libre des tiges de trois vérins 49 suspendus au tablier 33 par leurs cylindres et l'anneau plat 47 est rappelé vers ce tablier 33 par trois ressorts de traction 50.A cutting blade 46 is secured to the external part of the yoke 42, and points upwards. The flat ring 47 rests by three imprints of its lower face on spherical caps 48 carried at the free upper end of the rods of three jacks 49 suspended from the deck 33 by their cylinders and the flat ring 47 is recalled towards this deck 33 by three tension springs 50.

Un dispositif à diaphragme 51 se trouve dis-' posé entre les deux parties 29 et 30 de la douille. et fixé sous le tablier 33. Ce dispositif à diaphragme, du type dit « à iris est en soi connu, et comprend un disque rotatif muni de fentes en portions de spirale dans chacune desquelles s'engage un téton solidaire d'une tige mobile radialement et se terminant par une lame, les différentes lames s'imbriquant en écailles, de telle sorte qu'en position ouverte du diaphragme, ces lames sont écartées et dégagent complètement le passage axial de la douille, tandis qu'en position fermée, les lames déterminent un passage axial limité. Ce dispositif, bien connu, et dont le disque rotatif est déplacé par un vérin, n'est pas représenté en détail.A diaphragm device 51 is located between the two parts 29 and 30 of the sleeve. and fixed under the apron 33. This diaphragm device, of the so-called “iris type” is known per se, and comprises a rotary disc provided with slots in spiral portions in each of which engages a stud fixed to a radially movable rod. and ending with a blade, the different blades overlapping in scales, so that in the open position of the diaphragm, these blades are separated and completely clear the axial passage of the sleeve, while in the closed position, the blades determine a limited axial passage. This device, well known, and whose rotating disc is moved by a jack, is not shown in detail.

Une plaque d'appui circulaire 52, de section légèrement inférieure à celle de la douille, est portée à l'extrémité supérieure libre de la tige d'un vérin axial rectiligne à grande course 53, dont le cylindre est suspendu sous le tablier inférieur 35. Sous la plaque d'appui 52 est suspendue une contre-tige à méplats 54 parallèle à la tige du cylindre 53, et traversant une lumière 55 ménagée dans le tablier 35 et dans un étrier 56, porteur d'un vérin de blocage 57 susceptible d'immobiliser en position la contre-tige 54, et donc la plaque d'appui 52, par la sortie de sa tige appliquant un piston-frein 58 contre un méplat de cette contre-tige 54, elle-même serrée contre une branche de l'étrier 56. En position maximale tige sortie, le vérin 53 élève la plaque d'appui 52 de sorte que sa surface supérieure soit au niveau de l'ouverture 26 de la tête d'emballage et de plissage fixe 25, alors qu'en position maximale tige rentrée, la surface supérieure de cette plaque d'appui 52 est amenée au niveau d'une glissière d'évacuation 59, se raccordant pratiquement à la plaque 52 par une découpe circulaire. Un poussoir d'éjection 60, manoeuvré par un vérin d'éjection 61, dont le cylindre est bridé sur une traverse 62 entre deux montants 34, permet le transfert sur la glissière d'évacuation 59 de tout objet porté par la plaque d'appui 52 dans sa position inférieure.A circular support plate 52, of section slightly smaller than that of the sleeve, is carried at the free upper end of the rod of a long-stroke rectilinear axial cylinder 53, the cylinder of which is suspended under the lower apron 35 Under the support plate 52 is suspended a flattened counter-rod 54 parallel to the cylinder rod 53, and passing through a lumen 55 formed in the deck 35 and in a stirrup 56, carrying a blocking cylinder 57 capable to immobilize the counter rod 54, and therefore the support plate 52, by the exit of its rod applying a brake piston 58 against a flat part of this counter rod 54, itself clamped against a branch of the stirrup 56. In the maximum rod out position, the jack 53 raises the support plate 52 so that its upper surface is at the level of the opening 26 of the fixed packing and pleating head 25, while in the maximum retracted rod position, the upper surface of this support plate 52 is brought to the ni calf of an evacuation slide 59, practically joining the plate 52 by a circular cut. An ejection pusher 60, maneuvered by an ejection cylinder 61, the cylinder of which is clamped on a crosspiece 62 between two uprights 34, allows the transfer onto the evacuation slide 59 of any object carried by the support plate 52 in its lower position.

Deux fourchettes latérales 63, montées pivotantes autour d'un axe horizontal et transversal 64 par leurs extrémités inférieures, et retenues chacune dans une chape 65 déplacée longitudinalement par un vérin 66 articulé sur le tablier inférieur 35, entourent chacune de leurs dents un téton 67, saillant latéralement, d'une pince 68, dont le corps 69 est coulissant longitudinalement le long de deux glissières 70, dont le mors inférieur 71 est reçu dans la rainure 3 correspondante du plateau fixe 1, et dont le mors supérieur 72 porte un vérin 73 de pincement contre le mors inférieur 71. La paire de pince 68 avec les fourchettes 63 et les vérins de manœuvre 66 constituent un dispositif d'avance pas à pas d'une bande de matériau d'emballage introduite entre les plateaux fixe 1 et presseur 5, et dont une longueur utile à la découpe d'une feuille d'emballage circulaire est déroulée par une bascule transversale 74, montée pivotante par ses bras latéraux sur des attaches 75 solidaires du tablier supérieur 33, et manoeuvrée par un vérin (non représenté) en synchronisme avec un dispositif de freinage d'un tambour dérouleur 76 monté sur un axe transversal.Two lateral forks 63, pivotally mounted about a horizontal and transverse axis 64 by their lower ends, and each retained in a clevis 65 displaced longitudinally ment by a jack 66 articulated on the lower apron 35, surround each of their teeth a stud 67, projecting laterally, of a clamp 68, whose body 69 is sliding longitudinally along two rails 70, whose lower jaw 71 is received in the corresponding groove 3 of the fixed plate 1, and the upper jaw 72 of which carries a jack 73 pinching against the lower jaw 71. The pair of pliers 68 with the forks 63 and the operating jacks 66 constitute an advance device step by step a strip of packaging material introduced between the fixed plates 1 and presser 5, and of which a length useful for cutting a circular packaging sheet is unwound by a transverse rocker 74, pivotally mounted by its lateral arms on fasteners 75 secured to the upper deck 33, and maneuvered by a jack (not shown) in synchronism with a braking device of a unwinding drum 76 mounted on a transverse axis.

Au-dessus de la tête d'emballage et de plissage mobile 22, une potence 78 supporte deux vérins rectilignes et parallèles, dont l'un 79 est excentré et porte, à l'extrémité inférieure libre de sa tige, un poussoir en forme de piston annulaire 80, susceptible d'être descendu dans la douille jusqu'à un niveau légèrement inférieur au diaphragme 51, et dont l'autre 81 est axial et porte à l'extrémité inférieure libre de sa tige un organe de scellement 82 pouvant traverser le piston annulaire 80, et qui est un fer à souder, si le matériau d'emballage est thermosoudable, ou un porte étiquettes de type connu, dans le cas contraire, qui débite les étiquettes une à une. Les tiges des vérins 79 et 81 traversent leur cylindre de part en part, en deux dés 83 sont clavetés à leur extrémité supérieure. Ces dés 83 sont pourvus chacun d'une encoche rectangulaire qui embrasse un côté d'un barreau rectangulaire vertical de guidage 84, fixé entre les têtes des cylindres des vérins 79 et 81, de sorte que leurs tiges ne puissent pas tourner autour de leurs.axes respectifs.Above the mobile packing and pleating head 22, a bracket 78 supports two rectilinear and parallel jacks, one of which is eccentric and carries, at the free lower end of its rod, a pusher in the form of annular piston 80, capable of being lowered into the bushing to a level slightly below the diaphragm 51, and the other 81 of which is axial and carries at the free lower end of its rod a sealing member 82 which can pass through the annular piston 80, and which is a soldering iron, if the packaging material is heat-sealable, or a label holder of known type, otherwise, which dispenses the labels one by one. The rods of the jacks 79 and 81 pass through their cylinder right through, in two dice 83 are keyed at their upper end. These dice 83 are each provided with a rectangular notch which embraces one side of a vertical rectangular guide bar 84, fixed between the heads of the cylinders of the jacks 79 and 81, so that their rods cannot rotate around them. respective axes.

La machine dont la structure vient d'être décrite, fonctionne de la façon suivante : la bande 85 du matériau souple d'emballage est déroulée du tambour 76 en passant sur un rouleau de guidage 77, par la manoeuvre de la bascule 74, qui libère le frein du tambour 76 alors que les pinces 68 retiennent la bande 85 sur le plateau fixe 1. Après un mouvement d'aller et retour, la bascule 74 a déroulé une longueur suffisante pour la découpe d'une feuille, et cette longueur est entraînée et maintenue par le dispositif d'avance pas à pas entre le plateau presseur 5 relevé et le plateau fixe 1, tandis que le frein du tambour 76 est serré. Le plateau presseur 5 est alors descendu par les vérins 11 contre la bande 85 qu'il serre sur le plateau fixe 1, tandis que la tête mobile 22 reste relevée. Les buses d'aspiration 16 plaquent contre le plateau presseur 5 une partie de la bande 85 recouvrant l'ouverture 2 du plateau fixe 1, de façon à bien tendre la bande 85. La lame coupante 46, entraînée en rotation avec la bague tournante 31 autour de la tête fixe 25, est ensuite levée par le soulèvement de l'anneau plat 47 commandé par les vérins 49, ce qui amène la lame 46 à traverser l'ouverture 2 du plateau fixe 1, et à s'engager dans la gorge 14 du plateau presseur 5, en découpant sans bavure dans la bande 85 une feuille circulaire d'emballage. Puis les vérins 49 et les ressorts 50 rappellent l'anneau plat 47 vers le bas, ce qui ramène la lame coupante 46 en position de repos, dégagée de la gorge 14.The machine, the structure of which has just been described, operates as follows: the strip 85 of the flexible packaging material is unwound from the drum 76 passing over a guide roller 77, by the operation of the rocker 74, which releases the brake of the drum 76 while the clamps 68 hold the strip 85 on the fixed plate 1. After a back and forth movement, the rocker 74 has unrolled a length sufficient for cutting a sheet, and this length is driven and held by the step-by-step advance device between the raised pressure plate 5 and the fixed plate 1, while the brake of the drum 76 is applied. The pressing plate 5 is then lowered by the jacks 11 against the band 85 which it clamps on the fixed plate 1, while the movable head 22 remains raised. The suction nozzles 16 press against the pressure plate 5 a portion of the strip 85 covering the opening 2 of the fixed plate 1, so as to tighten the strip 85. The cutting blade 46, driven in rotation with the rotating ring 31 around the fixed head 25, is then lifted by lifting the flat ring 47 controlled by the jacks 49, which causes the blade 46 to pass through the opening 2 of the fixed plate 1, and to engage in the groove 14 of the pressure plate 5, by cutting without burrs in the strip 85 a circular packaging sheet. Then the jacks 49 and the springs 50 recall the flat ring 47 downwards, which brings the cutting blade 46 back to the rest position, released from the groove 14.

La tête d'emballage et de plissage mobile 22 est alors descendue par les vérins 19 sur la tête fixe 25. Grâce à sa suspension à course perdue, la tête mobile 22, en fin de course, ne repose que par son poids sur la tête fixe 25 en pinçant la feuille sur celle-ci, sans la déchirer ni la froisser. Les dentures coopérantes 23 et 28 des têtes d'emballage et de plissage 22 et 25 amorcent ainsi le plissage de la périphérie de la feuille, tandis que la partie centrale de cette feuille ferme l'ouverture 26 de la tête fixe 25, et se trouve supportée par la plaque d'appui 52 relevée en position haute.The mobile packing and pleating head 22 is then lowered by the jacks 19 onto the fixed head 25. Thanks to its lost-stroke suspension, the mobile head 22, at the end of its travel, only rests by its weight on the head fixed 25 by pinching the sheet on it, without tearing or creasing it. The cooperating teeth 23 and 28 of the packaging and pleating heads 22 and 25 thus initiate pleating of the periphery of the sheet, while the central part of this sheet closes the opening 26 of the fixed head 25, and is located supported by the support plate 52 raised in the high position.

Un objet à emballer, tel qu'un fromage, est ensuite disposé, de préférence par un dispositif automatique, par exemple du type bien connu à ventouse, sur la partie centrale de la feuilie, en appui sur la plaque 52. Le vérin 79 commande ensuite la descente du piston annulaire 80, qui vient s'appliquer contre la face supérieure de l'objet, puis enfonce celui-ci avec la feuille que l'objet recouvre de sa face inférieure dans la douille en repoussant la plaque d'appui 52, le vérin 53 étant alors alimenté à basse pression. Dans ce mouvement, la périphérie de la feuille glisse entre les dentures des têtes 22 et 25, puis le long de la surface latérale interne de la douille. Lorsque le piston annulaire 80 a effectué toute sa course, la face supérieure de l'objet se trouve positionnée légèrement sous le diaphragme 51, et le vérin de blocage 57 commande l'immobilisation de la plaque d'appui 52 dans la position correspondante. La course maximale du piston annulaire 80 étant définie, c'est l'épaisseur de l'objet qui détermine ainsi la position dans laquelle la plaque d'appui 52 est bloquée. Le piston annulaire 80 est ensuite retiré de la douille, et le diaphragme 31 est fermé en rabattant la périphérie de la feuille qui dépasse au-dessus de l'objet sur la face supérieure de ce dernier, en accentuant le plissage de cette feuille déjà amorcée par les dentures coopérantes des têtes 22 et 25. Le diamètre du passage axial délimité par le diaphragme 51 refermé est comparable à celui du piston annulaire 80, de sorte que la descente de l'organe de scellement, commandé par le vérin 81, permette de clore l'emballage fermé autour de l'objet par la feuille régulièrement plissée et rabattue sur cet objet. La feuille d'emballage plissée peut être en matière plastique thermosoudable, en papier, ou encore en métal (aluminium) revêtu d'une telle matière. Cette feuille peut aussi être en papier ordinaire, et le scellement peut alors être assuré par la pose d'une étiquette fournie par un distributeur associé à une tête appropriée, montée à l'extrémité inférieure de la tige du vérin 81. Il est également possible qu'une étiquette soit déposée sur la fermeture thermo- soudée de l'emballage. Lorsque le scellement est terminé, l'organe de scellement 82 est relevé en position initiale, et la tête mobile 22 ainsi que le plateau presseur 5 peuvent être également relevés en position initiale, à la suite d'une course qui, bien que faible (par exemple de 10 mm), est nettement suffisante pour que le dispositif d'avance pas à pas puisse positionner et bloquer sur le plateau fixe 1 une nouvelle longueur de bande du matériau d'emballage, préalablement déroulée par la bascule 74, et nécessaire à la découpe d'une nouvelle feuille, la bande découpée 85 étant reprise par un tambour enrouleur à friction ou à limiteur d'effort (non représenté) entraîné en rotation. Pendant ces opérations, le vérin de blocage 57 libère la contre tige 54 et la plaque d'appui 52 est ramenée par le vérin 53 en position inférieure (représenté en pointillé sur la figure 2). Le vérin d'éjection 61 manœuvre ensuite le poussoir d'éjection 60, qui transfère l'objet emballé 86 sur la glissière d'évacuation 59, puis revient en position initiale, et la plaque d'appui 52 est ensuite ramenée en position haute, au niveau de l'ouverture 26 de la tête 25 pour un nouveau cycle.An object to be packaged, such as a cheese, is then placed, preferably by an automatic device, for example of the well-known type with suction cup, on the central part of the sheet, bearing on the plate 52. The jack 79 controls then the descent of the annular piston 80, which is applied against the upper face of the object, then pushes it with the sheet that the object covers with its lower face in the socket by pushing the support plate 52 , the jack 53 then being supplied at low pressure. In this movement, the periphery of the sheet slides between the teeth of the heads 22 and 25, then along the internal lateral surface of the sleeve. When the annular piston 80 has completed its entire stroke, the upper face of the object is positioned slightly under the diaphragm 51, and the locking cylinder 57 controls the immobilization of the support plate 52 in the corresponding position. The maximum stroke of the annular piston 80 being defined, it is the thickness of the object which thus determines the position in which the support plate 52 is locked. The annular piston 80 is then removed from the sleeve, and the diaphragm 31 is closed by folding the periphery of the sheet which projects above the object on the upper face of the latter, accentuating the pleating of this already primed sheet. by the cooperating teeth of the heads 22 and 25. The diameter of the axial passage delimited by the closed diaphragm 51 is comparable to that of the annular piston 80, so that the descent of the sealing member, controlled by the jack 81, allows close the closed packaging around the object with the sheet regularly folded and folded over this object. The pleated packaging sheet may be made of heat-sealable plastic, of paper, or of metal (aluminum) coated with such a material. This sheet can also be made of plain paper, and the sealing can then be ensured by the application of a label supplied by a distributor associated with a head. suitable, mounted at the lower end of the cylinder rod 81. It is also possible that a label is deposited on the heat-sealed closure of the packaging. When the sealing is completed, the sealing member 82 is raised to the initial position, and the movable head 22 and the pressure plate 5 can also be raised to the initial position, following a stroke which, although small ( for example 10 mm), is clearly sufficient for the step-by-step advance device to be able to position and block on the fixed plate 1 a new length of strip of packaging material, previously unwound by the rocker 74, and necessary for cutting a new sheet, the cut strip 85 being taken up by a friction reel or force limiter drum (not shown) driven in rotation. During these operations, the blocking cylinder 57 releases the counter rod 54 and the support plate 52 is brought back by the cylinder 53 to the lower position (shown in dotted lines in FIG. 2). The ejection cylinder 61 then operates the ejection pusher 60, which transfers the packaged object 86 to the evacuation slide 59, then returns to the initial position, and the support plate 52 is then brought back to the high position, at the opening 26 of the head 25 for a new cycle.

Il est clair que l'invention n'est pas limitée à l'exemple de réalisation qui vient d'être décrit. Il est possible, par exemple, de remplacer les pinces à vérin du dispositif d'avance pas à pas par des pinces à fonctionnement électromagnétique et mobiles en va-et-vient le long des rainures 3 du plateau fixe 1. De manière connue, ces pinces peuvent être également remplacées par des rouleaux à rotation intermittente. De même, le déplacement de l'anneau plat 47 peut être assuré par une commande à fourchette. Il est à noter que le déplacement vertical amenant la lame tranchante en position de découpe peut également être assuré par un électro-aimant disposé sur le bras radial entraîné par la bague tournante ou par un petit vérin, par exemple pneumatique. De plus, le dispositif d'alimentation automatique en objets qui peut être associé à la machine, doit être adapté à la nature et à la consistance des objets. Pour des objets durs. un dispositif à pince, tel que celui décrit et représenté sur les figures 1 et 3 dans le brevet français N° 2 217 215 au nom du Demandeur, peut parfaitement remplacer le dispositif à ventouses pour transférer les objets d'un convoyeur d'alimentation vers les têtes d'emballage et de plissage 22 et 25. Pour les objets à consistance molle, on utilisera plutôt un dispositif à godets et à pinces tels que décrit et représenté sur les figures dans le brevet français N° 2 412 463 également au nom du Demandeur.It is clear that the invention is not limited to the embodiment which has just been described. It is possible, for example, to replace the jaw clamps of the step-by-step advancement device with clamps with electromagnetic operation and movable back and forth along the grooves 3 of the fixed plate 1. In known manner, these clamps can also be replaced by intermittently rotating rollers. Similarly, the movement of the flat ring 47 can be ensured by a fork control. It should be noted that the vertical displacement bringing the cutting blade into the cutting position can also be ensured by an electromagnet disposed on the radial arm driven by the rotating ring or by a small jack, for example pneumatic. In addition, the automatic object feeding device which can be associated with the machine, must be adapted to the nature and consistency of the objects. For hard objects. a clamp device, such as that described and represented in FIGS. 1 and 3 in French patent No. 2,217,215 in the name of the Applicant, can perfectly replace the suction cup device for transferring objects from a feed conveyor to the packing and pleating heads 22 and 25. For objects of soft consistency, a bucket and gripper device as described and shown in the figures in French patent No. 2,412,463, also in the name, will be used. Applicant.

La machine selon la présente invention permet, sur un poste unique, de découper les feuilles d'emballage et d'emballer les objets dans ces feuilles. On peut, au moyen de la machine selon la présente invention, emballer non seulement les produits tels que des fromages, des rubans de papier collant ou de machine à écrire, ou des blocs désodorisants déjà cités, mais également emballer dans des feuilles plissées, éventuellement transparentes, des pots, des boîtes et autres objets fragiles en verre, terre, grès, afin de protéger notamment leurs étiquetages ou leurs fermetures.The machine according to the present invention makes it possible, on a single station, to cut the packaging sheets and to pack the objects in these sheets. It is possible, by means of the machine according to the present invention, to pack not only products such as cheeses, tapes of sticky paper or of typewriter, or deodorant blocks already mentioned, but also to pack in pleated sheets, possibly transparencies, pots, boxes and other fragile objects made of glass, earth, sandstone, in particular to protect their labeling or closures.

Claims (13)

1. Machine for packaging substantially cylindrically shaped objects in sheets each cut out along a closed, preferably circular contour, from a web 85 of a supple packaging material, comprising a fixed packaging head 25 and a mobile packaging head 22 in the form of two rings of common axis, capable of gripping therebetween a packaging sheet when the mobile head 22 is brought against the fixed head 25, and of which the central openings 26, 27 are coaxial, at least one bush 29, 30 disposed in line with the central opening 26 of the fixed packaging head 25 and connected to that face of the latter which is not turned towards the mobile packaging head 22, a mobile pusher 80 making it possible to push an object to be packaged and the sheet on which it has been disposed, inside the bush 29, 30 up to a bearing plate 52 perpendicular to the axis of the bush 29, 30, a diaphragm device 51 making it possible, by partial obturation of the bush 29, 30, to fold the packaging sheet down on one of the faces of the object resting on the bearing plate 52, a sealing member 82 being introduced into the bush 29. 30 and applied, through the diaphragm 51, on the part of the packaging sheet folded on the object which rests against the bearing plate 52, after withdrawal of the mobile pusher 80 from the bush 29, 30, characterized in that it also comprises, on the one hand, for gripping the web 85 of supple packaging material, a fixed plate 1 presenting a central opening 2 of which the shape corresponds to that of the contour of the sheets, and of which the section is slightly greater than that of the sheets to be cut out, as well as a mobile presser plate 5, parallel to the fixed plate I and presenting on its face opposite the latter a groove 14 having the form of the contour of the sheets and coming opposite the central opening 2 of the fixed plate 1 when the presser plate 5 is applied against the latter, the presser plate 5 also presenting a central opening 13 inside the groove 14 allowing the passage of the mobile packaging head 22 and, on the other hand, for cutting out a sheet from a web 85 pressed between the fixed plate 1 and the presser plate 5, a system 31, 39 mobile along the contour of the sheets about the fixed packaging head 25 projecting inside the central opening 2 of the fixed plate 1 and a cutting tool 46, borne by the mobile system 31, 39 and movable in a direction perpendicular to the fixed and presser plates 1 and 5 respectively, between a cut-out position, in which the tool 46 traverses the central opening 2 of the fixed plate 1 and is engaged in the groove 14 of the presser plate 5, and a rest position in which the tool 46 is at least disengaged from the groove 14 of the presser plate 5.
2. Machine according to Claim 1, characterized in that the groove 14 is circular and in that the mobile system comprises a rotating ring 31 mounted in rotation about the bush 29, 30 and bearing a radial arm 39 at the outer end of which is mounted the cutting tool 46.
3. Machine according to Claim 2, characterized in that the cutting tool 46 is fast with a fork joint 42 mounted to pivot on the outer end of the radial arm 39 about a radial axis 43 perpendicular to the axis of rotation of the ring 31 and in that a roller 44, mounted in rotation in the fork joint 42 about a second radial axis 45 perpendicular to the axis of rotation of the ring 31 rolls on a ring 47 surrounding with clearance the rotating ring 31 and movable in translation along the axis of rotation of the ring 31 in order to control the position of the cutting tool.
4. Machine according to Claim 3, characterized in that the ring 47 rests by at least three impressions on as many spherical caps 48 borne by the rods of jacks 49 for controlling the axial translations of the ring 47 which is elastically returned towards these jacks 49.
5. Machine according to one of Claims 1 to 4, characterized in that the presser plate 5 presents, on its face opposite the fixed plate 1, and between its groove 14 and its central opening 13, a plurality of suction nozzles 16 opening into at least one annular channel 17 placed in communication with a source of depression to apply part of the web 85 of the supple packaging material obturating the central opening 2 in the fixed plate 1 against the presser plate 5 during cut-out of a sheet.
6. Machine according to one of Claims 1 to 5, characterized in that the web 85 of supple material is maintained and displaced between the fixed plate 1 and the presser plate 5 by a step-by- step advance device, comprising at least one pair of pincers 68 adapted to be displaced over guides 70 along the fixed plate 1 by at least one fork 63 mounted to pivot about an axis 64 transverse to the direction of displacement of the web 85 on the fixed plate 1 and manoeuvred by a jack 66.
7. Machine according to one of Claims 1 to 6, characterized in that the opposite faces of the packaging heads 22, 25 are provided with complementary radial teeth 23, 28 to start creasing of a sheet that they are gripping, so as to package the object in a sheet creased on its periphery, the axis common to the packaging heads 22, 25 and to the bush 29, 30 being vertical, the mobile head 22 being disposed above the fixed head 25 in the same way as the presser plate 5 is disposed above the fixed plate 1..
8. Machine according to one of Claims 1 to 7, characterized in that the mobile packaging head 22 is suspended with lost stroke on the rods of jacks 19 mounted on gantries 18 fast with the presser plate 5 on either side of its central opening 13, by means of diametrically opposite tabs 20, presenting openings traversed by the rods of jacks 19 of which the ends bear stops 21 for driving the tabs 20 which are shaped as offset ears 24 to join the face of the mobile head 22 which is not turned towards the fixed head 25.
9. Machine according to one of Claims 1 to 8, characterized in that the presser plate 5 is mounted to slide along columns 4 connecting to the fixed plate 1 fixed cross-pieces 8 bearing jacks II for controlling the displacements of the presser plate 5 towards the fixed plate 1, by their rods provided at their free end with spherical caps 12 cooperating with impressions in the presser plate 5, which is elastically returned towards the fixed crosspieces 8 by springs 10 abutting on the one hand against the fixed plate 1, on the other hand against the bottom of sleeves 7 borne by lateral tabs 6 of the presser plate 5, and traversed with guiding by the columns 4.
10. Machine according to one of Claims 1 to 9, characterized in that the bearing plate 52 mounted at the end of a rod of a jack 53, may be introduced by the latter into the bush 29, 30, until its bearing surface is at the level of the central opening 26 of the fixed packaging head 25, then pushed with the object by the mobile pusher 80 of which the stroke is limited so that the object is introduced into the bush 29, 30 beyond the diaphragm device 51, the bearing plate 52 being immobilized in this position by a blocking system 56, 57 the time of the operations of the diaphragm device 51 and the sealing member 82, then displaced to bring out the packaged object from the bush 29, 30 and place it on the path of an ejection member 60, 61 conducting it onto an evacuation station 59.
11. Machine according to any one of Claims 1 to 10, characterized in that the mobile pusher 80 is in the form of an annular piston displaced by a jack 79 eccentric with respect to the axis of the packaging heads 22-25, the sealing member 82 being movable axially through the annular piston 80 by an axial jack 81 parallel to the eccentric jack 79.
12. Machine according to any one of Claims 1 to 11, characterized in that the sealing member 82 is a head for welding thermoplastics materials.
13. Machine according to any one of Claims 1 to 12, characterized in that it comprises a label- holder, manoeuvered by an, axial jack 81 and coming to cover the packaged object.
EP82400121A 1981-01-26 1982-01-22 Machine for packaging cylindrically shaped objects in blanks cut from thermoplastic webs Expired EP0057144B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82400121T ATE13649T1 (en) 1981-01-26 1982-01-22 MACHINE FOR PACKING CYLINDER-SHAPED ARTICLES IN CIRCULAR BLANKS, FORMED FROM WEBS OF THERMOPLASTIC PACKAGING MATERIAL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8101366 1981-01-26
FR8101366A FR2498557B1 (en) 1981-01-26 1981-01-26 MACHINE FOR PACKING SUBJECTS OF SUBSTANTIALLY CYLINDRICAL FORM IN SHEETS CUT TO A CLOSED CONTOUR IN STRIPS OF FLEXIBLE PACKAGING MATERIAL

Publications (3)

Publication Number Publication Date
EP0057144A2 EP0057144A2 (en) 1982-08-04
EP0057144A3 EP0057144A3 (en) 1982-08-18
EP0057144B1 true EP0057144B1 (en) 1985-06-05

Family

ID=9254488

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82400121A Expired EP0057144B1 (en) 1981-01-26 1982-01-22 Machine for packaging cylindrically shaped objects in blanks cut from thermoplastic webs

Country Status (5)

Country Link
EP (1) EP0057144B1 (en)
AT (1) ATE13649T1 (en)
DE (1) DE3263959D1 (en)
ES (1) ES8301807A1 (en)
FR (1) FR2498557B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2665653B1 (en) 2011-01-21 2016-10-12 Soremartec S.A. A process and apparatus for packaging a product in a sealed wrapper of sheet material

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Publication number Priority date Publication date Assignee Title
FR2584334B1 (en) * 1985-07-05 1989-09-01 Evrard Jacques MACHINE FOR CUTTING THIN SHEETS INTO DISCS
GB2247222A (en) * 1990-07-24 1992-02-26 Portals Eng Ltd Wrapping articles in sheet material
ES2049599B1 (en) * 1991-10-04 1996-10-16 Ser Gonzalez Clemente Del "WRAPPING MACHINE FOR HORTICOLE PRODUCTS"
FR2730212A1 (en) * 1995-02-07 1996-08-09 Ix Manu Sa Packing machine for cheeses or similar products
KR101086571B1 (en) * 2011-01-20 2011-11-23 우영관 Member plate press and packaging machine
CN103144789B (en) * 2013-03-13 2014-11-26 宁波舜宇光电信息有限公司 Auxiliary jig and packing method for copper foil packing operation
CN103847995B (en) * 2014-02-24 2016-02-03 昆山安拓达自动化技术有限公司 A kind of copper-clad paper tinsel machine
CN105173163B (en) * 2015-10-12 2017-04-05 天津津树达机械有限公司 film packaging machine
CN114919812B (en) * 2022-06-09 2023-11-03 上海尚翱科技有限公司 Automatic packaging line for tea cakes
CN117018883B (en) * 2023-08-16 2024-04-19 深圳市爱玛特科技有限公司 Manufacturing process of multi-wall carbon nano tube composite ultrafiltration membrane

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GB162531A (en) * 1920-04-20 1921-05-05 Forgrove Mach Improvements in or relating to tablet-wrapping machines
US2656659A (en) * 1950-12-26 1953-10-27 Paper Art Company Inc Bulk paper plate wrapping machine
GB710500A (en) * 1951-03-09 1954-06-16 Rose Brothers Ltd Improvements in wrapping machines
FR2112734A5 (en) * 1970-11-06 1972-06-23 Evrard Jacques Thin plastic films - are cut to produce discs using orbiting cutter blade
FR2217215A1 (en) * 1973-02-13 1974-09-06 Evrard Jacques
FR2225336B1 (en) * 1973-04-11 1977-08-05 Evrard Jacques

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2665653B1 (en) 2011-01-21 2016-10-12 Soremartec S.A. A process and apparatus for packaging a product in a sealed wrapper of sheet material

Also Published As

Publication number Publication date
EP0057144A2 (en) 1982-08-04
EP0057144A3 (en) 1982-08-18
DE3263959D1 (en) 1985-07-11
FR2498557B1 (en) 1985-11-08
FR2498557A1 (en) 1982-07-30
ATE13649T1 (en) 1985-06-15
ES509032A0 (en) 1983-01-01
ES8301807A1 (en) 1983-01-01

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