EP1037800A1 - Machine for setting heat-shrinkable sleeves on objects from a continuous sheath - Google Patents

Machine for setting heat-shrinkable sleeves on objects from a continuous sheath

Info

Publication number
EP1037800A1
EP1037800A1 EP98958979A EP98958979A EP1037800A1 EP 1037800 A1 EP1037800 A1 EP 1037800A1 EP 98958979 A EP98958979 A EP 98958979A EP 98958979 A EP98958979 A EP 98958979A EP 1037800 A1 EP1037800 A1 EP 1037800A1
Authority
EP
European Patent Office
Prior art keywords
sheath
torpedo
rollers
machine according
sleeve
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.)
Granted
Application number
EP98958979A
Other languages
German (de)
French (fr)
Other versions
EP1037800B1 (en
Inventor
Eric Fresnel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sleever International Co SA
Original Assignee
Sleever International Co SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sleever International Co SA filed Critical Sleever International Co SA
Publication of EP1037800A1 publication Critical patent/EP1037800A1/en
Application granted granted Critical
Publication of EP1037800B1 publication Critical patent/EP1037800B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65C—LABELLING OR TAGGING MACHINES, APPARATUS, OR PROCESSES
    • B65C3/00—Labelling other than flat surfaces
    • B65C3/06—Affixing labels to short rigid containers
    • B65C3/065—Affixing labels to short rigid containers by placing tubular labels around the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/13—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the preformed tubular webs being supplied in a flattened state
    • B65B9/14—Devices for distending tubes supplied in the flattened state

Definitions

  • the present invention relates to a machine for laying sleeves of heat-shrinkable plastic on objects, in particular elongated objects of small section, from a continuous sheath wound flat.
  • this type of sleeve fitting machine comprises a shaping mandrel over which the sheath passes to open, a means of driving the sheath using motorized rollers which cooperate with a part
  • the machines described in the aforementioned documents use motorized pressure rollers cooperating with counter-rollers carried by the shaping mandrel, the sheath running around the conforming mandrel.
  • Document JP-A-1.410.808 thus illustrates a floating mandrel type shaper having, in addition to an arrangement with idle rollers and counter-rollers, a central window at the level of which two motorized rollers pinch the walls of the sheath.
  • the support of the floating mandrel remains provided by rollers and counter-rollers provided above on the shaper.
  • document US-A-2,765,607 illustrates a floating mandrel which is in two parts connected by lateral rods, forming a central opening in which motorized drive rollers pinch the walls of the sheath. The support of the floating mandrel is then ensured by pressing a bead of the flattened upper part (forming introduction pallet) on the two motorized rollers.
  • the shaping mandrels illustrated in the aforementioned documents do not really make it possible to solve the problem of the transfer of sheaths of very small diameters, since there are unavoidable phenomena of heating and wear, which phenomena are liable to deteriorate or even tear off. the continuous sheath transferred around the mandrel. This is even more true if one seeks to use the machine at high rates, for example from one hundred to two hundred sleeves installed per minute. Indeed, a sheath whose diameter is between 5 and 20 mm gives a flattened ribbon of reduced width (from 8 to 31 mm), and this flattened ribbon is then relatively rigid and difficult to tow. The high mechanical resistance implies high efforts to overcome, from which it follows the phenomena of heating and wear mentioned above.
  • the invention aims precisely to solve this problem, by designing a sleeve fitting machine which is more efficient and does not have the aforementioned drawbacks.
  • the object of the invention is therefore to design a machine for laying sleeves in thermorelated plastic material ⁇ which can be towed on objects from a continuous sheath wound flat, which is entirely compatible with sheaths of small diameters, for example of diameters between 5 and 20 mm, while supporting high rates, that is to say greatly exceeding two hundred sleeves placed per minute, with optimal positional control of the sleeves placed on the objects.
  • a material for fitting sleeves machine plasticizer ⁇ shrink on objects from a continuous sheath wound flat comprising a shaping mandrel over which the sheath for s' open, a means of driving the sheath using motorized rollers which cooperate with an associated portion of the shaping mandrel to slide over an object the open end of the sheath, and a cutting means intervening between the mandrel accordance ⁇ estimator and the object to form a sleeve associated with said object
  • the shaping mandrel is substantially horizon ⁇ tal and comprising two coaxial torpedoes connected together by a wired central element, with an upstream torpedo having an upstream end forming an introduction pallet and a downstream end with a smooth double bevel, and a downstream torpedo having an upstream end with double smooth bevel and a downstream end with a straight edge adjacent to the cutting means, each torpedo of said mandrel freely resting on an associated V-shaped support, and
  • the introduction palette of the upstream torpedo extends in a plane which is substantially perpendicular to the pinch plane of the continuous sheath between the two rollers.
  • This allows shaping of the sheath around the mandrel which gives said sleeve a section shaped ace of diamonds at the output of a shaping mandrel whose downstream torpedo has a sensitive section ⁇ circular, this form being favorable to on the one hand for the smooth transfer of the sheath onto a cylindrical object, and on the other hand for the organization of a clean cut without bending of the sheath, downstream of the shaping mandrel.
  • the upstream torpedo and / or tor ⁇ sacking downstream has two plane side facets sensi ⁇ ably perpendicular to the nip plane of the continuous sheath between the two rollers.
  • These flat lateral facets reduce the lateral friction of the sheath on the torpedoes of the shaping sleeve, which is particularly favorable when said sheath carries a deposit of varnish or the like on its internal wall.
  • the above-mentioned wire element is a flexible wire anchored at its two ends in the torpedoes, one of the anchors being releasable so as to be able to adjust the length of said wire element between said torpedoes.
  • This wire element will for example consist of a steel wire of about 1 mm in diameter.
  • the double smooth bevels of the upstream and downstream torpedoes are formed of inclined plane facets arranged symmetrically with respect to a median plane passing through the wire element and tangent to the two pinch rollers.
  • the smooth double bevel of the upstream torpedo is formed by two inclined plane facets approximately 30 ° and the two pinch rollers pass tangentially over this double bevel, while the smooth double bevel of the downstream torpedo is formed by two planar facets more slightly inclined.
  • this notch facilitates the passage of the lower fold of the sheath and avoids creasing the latter.
  • the cutting means comprises a blade carried by a rotating arm with a horizontal axis, and said means is positioned so that its blade shaves the straight edge of the downstream end of the downstream torpedo.
  • the cutting blade has two straight cutting edges meeting at a leading edge, and the two cutting edges are substantially perpendicular, being arranged so that the leading edge contacts the top of the sheath in the vicinity of a folding angle thereof resulting from the passage of said sheath on the insertion pallet or between the two pinch rollers.
  • the cutting means thus arranged makes it possible to obtain a perfectly clean cut made progressively, without folding the sheath, in a very short time.
  • the two pinch rollers are coated with an elastomer on their periphery, and are in contact with each other on either side of their peripheral groove which is trapezoidal and has two facets inclined symmetrically with respect to their median plane, forming a V of approximately 60 ° of opening, and the two pinch rollers are chamfered on their end edges.
  • the two pinch rollers are mounted on a support frame which can pivot, preferably about a vertical axis, in order to allow an overall lateral release of the drive means.
  • a support frame which can pivot, preferably about a vertical axis, in order to allow an overall lateral release of the drive means.
  • Such a clearance then allows a quick and easy intervention for a cleaning operation or change of sheath format.
  • FIG. 3 is an elevational view showing in more detail the horizontal shaping mandrel in two torpedoes and the two adjacent pinch rollers arranged on either side of the wire element connecting the two torpedoes;
  • FIG. 4 is a top view of the assembly illustrated in FIG. 3,
  • FIG. 5 is an elevational view (partially in section) on a larger scale of the horizontal shaping mandrel, and Figure 6 a top view of said mandrel;
  • - Figure 7 is a section along VU-VU of Figure 3, and Figure 8 a partial view on a larger scale showing the horizontal shaping mandrel over which the sheath passes;
  • Figure 9 is a section along IX- IX of Figure 3, and Figure 10 is a partial view more large scale making it possible to better distinguish the passage of horizontal axis delimited between the two gripper rollers ⁇ ment adjacent;
  • Figure 11 is a section along XI-XI of Figure 3, and Figure 12 a detail section on a larger scale similar to that of Figure 8;
  • - Figure 13 is a detail view showing the stop of the advancement of the sheath on the object, just before the sheath cutting pass;
  • - Figure 14 is a detail illustrating an object in a notch of the double barrel, coated with a sheath section with a section in the form of ace of diamonds;
  • - Figure 15 is a detail view illustrating a preferred embodiment of the sheath cutting means
  • - Figure 16 is a detail view illustrating a variant in which the downstream end of the upstream torpedo has a smooth double bevel defined by two added inserts.
  • FIGS. 1 and 2 illustrate a machine 1 for laying thermoretractal plastic sleeves on objects from a continuous sheath wound flat, arranged in accordance with the invention.
  • This machine comprises an overall frame 2 surmounted by a glazed compartment 3 in which are arranged all the mechanical members ensuring the supply of the objects, as well as the horizontal transfer of a continuous sheath wound flat with progressive advance for the wrapping each individual object and cutting the sheath to form a section of sheath or sleeve.
  • a control cabinet 4, supported by a pivoting console 5 allows the operator to monitor the various parameters of the laying machine, and possibly to modify certain settings of the operating cycle.
  • the object received in two aligned notches 9 of the double barrel 7 then progresses due to the rotation of the double barrel, and arrives at a station 11 for controlling the presence of an object (for example provided by means of an optical sensor), then at a station 12 which is the basic station in advance of sheath and cutting to define a section of sheath or sleeve covering the object 10.
  • the object 10 coated with its sleeve then continues its circular path to arrive at a lower guide 13 which prevents it from falling, until that it reaches an outlet chute 14, arranged here at the level of the axis of the double barrel 7, the object coated with its sleeve then falling on a conveyor 16 which moves horizontally as shown diagrammatically by the arrow 200.
  • the objects 10 coated with their sleeve which are deposited on the conveyor 16 then pass individually at a tunnel retraction 17 equipped with heating elements (not shown here), for example infrared elements, in order to carry out the retraction of each sleeve on the associated object.
  • the objects coated with their retracted sleeve are collected in a tank 18.
  • FIG. 2 makes it possible to better distinguish a continuous sheath 20, wound flat by forming a reserve reel 21 mounted on a fixed support 22, which is unwound from this reel passing over different rollers to arrive at a station 12 of horizontal sheath transfer.
  • a sheath drive there is provided a sheath drive means 90 with two motorized rollers 25, 26, the drive of which is ensured by a belt 27 passing around the output shaft of a drive motor 28.
  • the sheath is then pinched between the two rollers 25, 26 between two torpedoes constituting the horizontal shaping mandrel.
  • the sheath arrives at the transfer station 12, after having passed between two guide rollers 29 here with a vertical axis, in a still flattened position, the section of the sheath then extending in a substantially vertical plane.
  • a cutting means 30, which will be described in more detail below, is arranged at the outlet of this transfer station 12, in the vicinity of the double barrel 7, in order to cut the end of the sheath threaded on the object, to define a section of sheath or sleeve.
  • the sheath drive means 90 and its two motorized rollers 25, 26 are in this case mounted on a support frame 23 arranged in the form of a turret secured to a fixed cross member 24, being able to pivot about an axis vertical 19.
  • a pivoting assembly allows overall lateral clearance of the drive means 90. This is very advantageous in practice, because an operator can intervene quickly and easily, thanks to the clear access to the components of the drive means. drive, for a cleaning or maintenance operation, or to change the size of the sheath. Once the operation has been carried out, the operator brings the mobile assembly back to its operating position, and the assembly returns directly to the position of alignment with the object.
  • This swivel mount allows more opportunities for rapid, realized a very compact ⁇ laying machine drive means.
  • the laying machine comprises a shaping mandrel over which the sheath to open, a means of driving the sheath using motorized rollers which cooperate with an associated part of the shaping mandrel to thread onto an object the open end of the sheath, and a cutting means intervening between the shaping mandrel and the object support barrel to form a sleeve associated with said object.
  • the shaping mandrel 40 of the laying machine according to the invention is however arranged in a very particular way as will now be described.
  • the shaping mandrel 40 is in fact substantially horizontal (with reference to its axis 100) and comprises two coaxial torpedoes 41, 42 linked together by a wired central element 43.
  • upstream and downstream are used here with reference to the direction of travel of the sheath, which is shown diagrammatically on the Figures 3 and 4 by arrow 101.
  • the wire element 43 which is for example constituted by a flexible steel wire of approximately 1 mm in diameter, is anchored at its two ends 52, 53 in the torpedoes 41, 42.
  • the end 52 is a end olive which allows an anchoring in abutment by natural wedging, while the end 53 is fixed by an anchoring which is releasable.
  • a releasable anchoring system using a clamping jaw 54 with conical outer surface, bearing against a stop cone 55, as well as a clamping sleeve 56 engaged in an associated through thread 57 of the downstream torpedo 42.
  • the downstream end 45 of the upstream torpedo 41 and the upstream end 46 of the downstream torpedo 42 are shaped to have a smooth double bevel.
  • the double bevels denoted 48 and 49 of the upstream 41 and downstream torpedoes 42 are formed of inclined plane facets arranged symmetrically with respect to a median plane passing through the wire element 43 and tangent to the rollers 25, 26.
  • the smooth double bevel 48 of the upstream torpedo is formed by two inclined plane facets, for example by an angle of the order of 30 °, and the two pinch rollers 25, 26 pass tangentially over this smooth double bevel .
  • FIG. 16 illustrates such a variant and shows an end 45 of the upstream torpedo 41 fitted with plates 75, which are preferably interchangeable, the free faces of which constitute the inclined plane facets which cooperate with the pinch rollers 25, 26
  • plates 75 can be made of any suitable material, such as plastic or ceramic.
  • the surface condition is then perfectly controlled at the level of the double bevel smooth 48.
  • the pair of smooth chamfers of the downstream torpedo 49 is in turn formed by two facets more weakly INCLI ⁇ born.
  • each torpedo 41, 42 of the shaping mandrel 40 rests freely on an associated V-shaped support 60, the two drive rollers 25, 26 being arranged between these two V-shaped supports.
  • the section in FIG. 7 and the detail in FIG. 8 make it possible to better distinguish one of these supports 60, with its V-shaped facets denoted 60.1 for perfect axial centering of the torpedoes.
  • the supports 60 are here supplemented by an upper stop 61 avoiding the lifting of the torpedo 41.
  • a longitudinal notch 60.2 at the bottom of the V-shaped groove of each support 60 This notch facilitates the passage of the lower fold of the sheath at the bottom of the groove, and significantly reduces friction, so that it is possible to tow the sheath more freely, without the risk of wrinkling thereof.
  • FIGS. 7 and 8 also show the presence, on the torpedo 41, of two planar lateral facets 58, substantially perpendicular to the plane of gripping of the continuous sheath between the two rollers 25, 26.
  • planar lateral facets 58 make it possible to avoid a excessive lateral support of the sheath, which is particularly advantageous when the sheath is coated with a special varnish or the like on its internal face.
  • the sheath 20 passing over the insertion pallet 44 is flat, but it opens gradually by passing over the main part of the upstream torpedo 41, the section of which is substantially circular. Although this is not shown in Figures 7 and 8, the sheath will in practice have a slight bending at the top and bottom of the sheath which results from its initial flattened shape.
  • the two adjacent pinch rollers 25, 26 are arranged symmetrically on either side of the wire element 43 of the horizontal shaping mandrel 40, and each roller 25, 26 has a peripheral groove 65, 66 complementary to that of the other roller 26, 25 in order to form a passage 67 of horizontal axis for said wire element. As can be seen in FIG.
  • the adjacent pinching rollers 25, 26 also pass in the vicinity of the bevelled smooth edges of the torpedoes 41, 42, that is to say inclined plane facets 48 of the upstream torpedo 41 and 49 downstream torpedo 42.
  • the sheath 20 passing over the upstream torpedo 41 and arriving at the level of the double smooth bevel 48 is then pinched by the two rollers 25, 26 which flatten the sheath on the wire element 43 while transferring it horizontally, and the sheath is in no way blocked on this wire element, thanks to the presence of the peripheral grooves 65, 66 which define the passage 67.
  • FIG. 9 there are also the housings 62, 63 carrying the rollers 25, 26, and , on the other side of these housings, the pulleys 64 on which the aforementioned transmission belt 27 passes, serving to rotate the rollers 25, 26.
  • rollers 25, 26 The arrangement of the rollers 25, 26 is shown in more detail in FIG. 10.
  • the rollers 25, 26 are in contact with each other on either side of their peripheral groove 65, 66.
  • the two pinch rollers 25, 26 will be coated an elastomer on their periphery, for example polyurethane of adequate hardness.
  • the peripheral groove 65, 66 of at least one of the two pinch rollers 25, 26 may be of trapezoidal shape as illustrated in FIG. 10 (it will of course be possible to provide a different shape, including a shape in traditional V).
  • These two grooves 65, 66 then have two inclined facets 68, 69, the inclination being symmetrical relative to the median plane denoted P of the two rollers 25, 26, forming a V of approximately 60 ° opening.
  • These facets 68, 69 participate in the overall guidance, and avoid any lateral offset of the sheath in movement which passes over the wire element 43. It will also be noted the presence of chamfers 70, 71 on the end edges of the rollers 25 , 26. These chamfers 70, 71 make it possible to avoid excessive crushing of the sheath 20, which would create a fold in the vicinity of the edges of said sheath, the significant marking of which would be difficult to remove during the retraction of the sleeve on the object.
  • the wire element 43 remains positioned in the median plane P, thanks to the correct positioning of the upstream 41 and downstream torpedoes 42 forming the horizontal shaping mandrel 40.
  • FIGS. 11 and 12 make it possible to distinguish plane lateral facets 59 also provided on the downstream torpedo 42 to avoid excessive friction, in the same way as the facets 58 of the upstream torpedo 41.
  • the sheath which passes horizontally between the supports 60, 61 and the downstream torpedo 42 will in reality have a slight bending along four edges giving it a section in ace of diamonds.
  • the upper and lower folds correspond to the passage of the sheath on the insertion pallet 44, and the two lateral folds correspond to the passage between the two pinch rollers 25, 26 adjacent.
  • the form of ace of diamonds for the section of the sheath 20 is advantageous insofar as the quadrilateral thus formed just passes over the section of the object 10 to be coated by sliding lightly on this object. This is favorable for obtaining a very precise axial and transverse positioning of the sleeve on the object.
  • the retraction call is limited, insofar as the sheath tangents the object to be coated at four lateral zones, the retraction call mainly concerning the four slightly marked edges.
  • the circular shape of the outlet section of the downstream torpedo 42 is naturally only an example, and other specific shapes (square, diamond or ellipse) can be provided depending on the shape of the object concerned, in order to produce a preform of the sheath at the outlet of the former which is perfectly adapted to the section of the object. This facilitates precise positioning, and allows high installation rates that can exceed two hundred sleeves installed per minute.
  • FIG. 3 there is also shown a cutting means 30, consisting of a blade 31 mounted on an arm 32 which rotates about a horizontal axis 32 ', being driven by an associated motor 33.
  • the plane denoted 50 passage of the rotating blade 31 will in practice be directly adjacent to the straight edge 51 of the downstream torpedo 42, which participates in the development of a precise cut without folding the sheath during this cutting phase.
  • the continuous sheath 20 extends beyond the straight edge 51 of the downstream torpedo 42, to thread onto the object 10 to be coated, and this over a length predetermined in advance (which can even go to the total length of the object).
  • the drive of the motorized rollers 25, 26 is stopped, and the cutting takes place, at the level of the cutting plane 50.
  • the detail in FIG. 14 makes it possible to clearly distinguish the element 10 received in a notch 9 of the double barrel 7, with the sheath 20 in the form of an ace of diamonds which covers it.
  • the sheath section thus separated forms a sleeve 80 which is intended to be then retracted on the object 10 at the level of the retraction tunnel 17 of the laying machine.
  • the cutting means 30, with its blade 31 carried by a rotating arm 32 of horizontal axis 32 'parallel to the axis of the torpedoes 41, 42, said means preferably being, as has been described above, positioned so that its blade 31 shaves the straight edge 51 of the downstream end 47 of the downstream torpedo 42.
  • the cutting blade 31 has two straight cutting edges, noted 31.1, 31.2 joining at an attack edge noted 31.3.
  • the two cutting edges 31.1, 31.2 are preferably substantially perpendicular, and arranged so that the leading edge 31.3 contacts a top of the sheath 20 in the vicinity of a bending angle of the latter resulting from the passage of said sheath on the insertion pallet 44 or between the two pinching rollers 25, 26.
  • an arrangement of the two cutting edges 31.1, 31.2 has been illustrated, with an attack at the level of the upper folding angle 20 'of the sheath 20, but it goes without saying that one could provide an attack from another angle of folding.
  • This arrangement of the cutting edges and the leading edge of the blade 31 makes it possible to make an extremely satisfactory cut of the sheath 20 thanks to the massive effect of the percussion exerted on the level of the bending angle 20 ′, and immediately followed by a cut of the upper left edge of the sheath produced by the edge 31.1 of the blade, simultaneously with the progressive attack on the upper right edge and then on the lower right edge by the edge cutting 31.2.
  • This progressive double cutting is carried out without folding, with a shearing effect which is extremely favorable for the sharpness of the cutting of the wall of the sheath.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

The invention concerns a machine for setting heat-shrinkable plastic sleeves on objects, from a flat-wound continuous sheath, characterised in that a horizontal shaping sleeve (40) is provided comprising two coaxial separator heads (41, 42) mutually connected by a central wire element (43), the two separator heads having facing ends (45, 46) with smooth double bevel and each resting freely on an associated V-shaped support (60). The means driving the sheath comprises, between the two V-shaped supports (60), two adjacent pinch rollers (25, 26) symmetrically arranged on either side of the wire element (43) and passing in the proximity of the smooth bevelled edges of the separator heads (41, 42), each roller (25, 26) having a peripheral groove matching that of the other roller so as to form a passage with horizontal axis for said wire element.

Description

MACHINE DE POSE DE MANCHONS THERMORETRACTABLES SUR DES OBJETS, A PARTIR D'UNE GAINE CONTINUEMACHINE FOR LAYING SHRINK SLEEVES ON OBJECTS FROM A CONTINUOUS SHEATH
La présente invention concerne une machine de pose de manchons en matière plastique thermorétractable sur des objets, en particulier des objets allongés de faible section, à partir d'une gaine continue enroulée à plat.The present invention relates to a machine for laying sleeves of heat-shrinkable plastic on objects, in particular elongated objects of small section, from a continuous sheath wound flat.
10 Conformément à la technique classiquement utilisée dans ce domaine, ce type de machine de pose de manchons comporte un mandrin conformateur sur lequel passe la gaine pour s'ouvrir, un moyen d'entraînement de la gaine utilisant des galets motorisés qui coopèrent avec une partieIn accordance with the technique conventionally used in this field, this type of sleeve fitting machine comprises a shaping mandrel over which the sheath passes to open, a means of driving the sheath using motorized rollers which cooperate with a part
15 associée du mandrin conformateur pour enfiler sur un objet l'extrémité ouverte de la gaine, et un moyen de coupe intervenant entre le mandrin conformateur et l'objet pour former un manchon associé audit objet.15 associated with the shaping mandrel for threading on an object the open end of the sheath, and a cutting means intervening between the shaping mandrel and the object to form a sleeve associated with said object.
On a ainsi développé depuis une vingtaine d'an-We have thus developed over the past twenty years
20 nées un concept de mandrins conformateurs flottants agencés verticalement. On pourra à ce titre se référer aux documents FR-A-2.490.590, US-A-3 , 792 , 807 , US-A-3 , 910 , 013 , US-A- 4,016,704, US-A-4, 600,371, GB-A-1.430.090 , et EP-A-0 109 105.20 born a concept of floating conforming mandrels arranged vertically. As such, reference may be made to documents FR-A-2,490,590, US-A-3, 792, 807, US-A-3, 910, 013, US-A- 4,016,704, US-A-4, 600,371 , GB-A-1.430.090, and EP-A-0 109 105.
25 Pour le transfert de la gaine continue autour du mandrin conformateur, les machines décrites dans les documents précités utilisent des galets presseurs motorisés coopérant avec des contre-galets portés par le mandrin conformateur, la gaine défilant autour du mandrin conforma-25 For the transfer of the continuous sheath around the shaping mandrel, the machines described in the aforementioned documents use motorized pressure rollers cooperating with counter-rollers carried by the shaping mandrel, the sheath running around the conforming mandrel.
30 teur étant pincée entre les galets presseurs motorisés et les contre-galets montés fous sur des axes associés du mandrin. Ces techniques sont maintenant bien maîtrisées, et largement utilisées pour la pose de manchons sur des objets tels que flacons, bouteilles et autres conteneurs.30 tor being pinched between the motorized pressure rollers and the counter-rollers idly mounted on associated axes of the mandrel. These techniques are now well mastered, and widely used for the installation of sleeves on objects such as flasks, bottles and other containers.
35 Toutefois, si l'on souhaite utiliser des gaines de faibles diamètres pour garnir des objets fins et allon¬ gés, c'est-à-dire des gaines dont le diamètre est largement inférieur à 20 mm, la technique précédente à contre-galets montés fous sur le mandrin conformateur devient impratica- ble . En effet, il est illusoire d'imaginer monter des contre-galets sur un mandrin conformateur de diamètre très inférieur à 20 mm, car ces contre-galets présenteraient alors un diamètre très faible, et devraient alors tourner à des vitesses de rotation extrêmement élevées lors du défilement de la gaine autour du mandrin conformateur, ce qui induirait des phénomènes d'usure et d' échauffement incompatibles avec une utilisation rationnelle à l'échelle industrielle .35 However, if one wishes to use sheaths small diameter for lining purposes and objects allon ¬ aged, that is to say ducts whose diameter is well below 20 mm, the prior art against the rollers mounted idle on the shaping mandrel becomes impratica- ble. Indeed, it is illusory to imagine mounting counter-rollers on a shaping mandrel with a diameter much less than 20 mm, because these counter-rollers would then have a very small diameter, and should then rotate at extremely high speeds of rotation during scrolling of the sheath around the shaping mandrel, which would induce phenomena of wear and overheating incompatible with rational use on an industrial scale.
On a par ailleurs proposé d'organiser le défile- ment de la gaine sur un mandrin conformateur en pinçant aussi la gaine entre deux galets motorisés au niveau d'une ouverture intermédiaire du mandrin conformateur.It has also been proposed to organize the passage of the sheath on a shaping mandrel by also pinching the sheath between two motorized rollers at an intermediate opening of the shaping mandrel.
Le document JP-A-1.410.808 illustre ainsi un conformateur du type mandrin flottant présentant, en plus d'un agencement à galets et contre-galets fous, une fenêtre centrale au niveau de laquelle deux galets motorisés pincent les parois de la gaine. Toutefois, le support du mandrin flottant reste assuré par des galets et contre- galets prévus plus haut sur le conformateur. Selon la même approche, le document US-A-2.765.607 illustre un mandrin flottant qui est en deux parties reliées par des tiges latérales, en formant une ouverture centrale dans laquelle des rouleaux motorisés d'entraînement viennent pincer les parois de la gaine. Le support du mandrin flottant est alors assuré par un appui d'un bourrelet de la partie supérieure aplatie (formant palette d'introduction) sur les deux rouleaux motorisés. La partie inférieure, à base circulaire, sert alors de conformateur et de contrepoids. On pourra également se référer au document FR-A-2 738 797 qui illustre un conformateur à deux torpilles reliées entre elles par une plaquette au niveau de laquelle la gaine est pressée par des galets d'entraînement, ou encore au document EP-A-0 368 663 qui illustre un conformateur à deux mandrins flottants, l'un plat à fenêtre (au niveau de laquelle la gaine est pincée par des galets d'entraînement) , et l'autre en forme de torpille, agencée en aval du dispositif de coupe.Document JP-A-1.410.808 thus illustrates a floating mandrel type shaper having, in addition to an arrangement with idle rollers and counter-rollers, a central window at the level of which two motorized rollers pinch the walls of the sheath. However, the support of the floating mandrel remains provided by rollers and counter-rollers provided above on the shaper. According to the same approach, document US-A-2,765,607 illustrates a floating mandrel which is in two parts connected by lateral rods, forming a central opening in which motorized drive rollers pinch the walls of the sheath. The support of the floating mandrel is then ensured by pressing a bead of the flattened upper part (forming introduction pallet) on the two motorized rollers. The lower part, with a circular base, then serves as a conformator and counterweight. Reference may also be made to document FR-A-2 738 797 which illustrates a conformator with two torpedoes connected between them by a plate at the level of which the sheath is pressed by drive rollers, or even in document EP-A-0 368 663 which illustrates a shaper with two floating mandrels, one flat with window (at which the sheath is pinched by drive rollers), and the other in the form of a torpedo, arranged downstream of the cutting device.
En variante, comme cela est illustré dans le document FR-A-2 061 240, on a également proposé d'utiliser un conformateur vertical composé de deux torpilles reliées entre elles par une tige, et des galets d'entraînement qui pincent la gaine aplatie au niveau de la tige, avec un contact au niveau de quatre galets fous prévus sur chacune des torpilles. Là encore, l'utilisation des galets d'appui ne permet pas d'utiliser des gaines de faibles diamètres.As a variant, as illustrated in the document FR-A-2 061 240, it has also been proposed to use a vertical shaper composed of two torpedoes connected together by a rod, and drive rollers which pinch the flattened sheath at the level of the rod, with a contact at the level of four idle rollers provided on each of the torpedoes. Again, the use of support rollers does not allow the use of sheaths of small diameters.
Finalement, les mandrins conformateurs illustrés dans les documents précités ne permettent pas réellement de résoudre le problème du transfert de gaines de très petits diamètres, car on rencontre des phénomènes incontournables d' échauffement et d'usure, lesquels phénomènes risquent de détériorer voire d'arracher la gaine continue transférée autour du mandrin. Ceci est encore plus vrai si l'on cherche à utiliser la machine à des cadences élevées, par exemple de cent à deux cents manchons posés par minute. En effet, une gaine dont le diamètre est compris entre 5 et 20 mm donne un ruban aplati de largeur réduite (de 8 à 31 mm) , et ce ruban aplati est alors relativement rigide et difficile à tracter. La forte résistance mécanique implique des efforts élevés à vaincre, d'où il en découle les phénomènes d' échauffement et d'usure mentionnés plus haut. De plus, lorsque les cadences sont élevées, le contrôle positionnel des objets en défilement sous le conformateur implique l'utilisation de pinces ou analogues, ce qui complique encore la structure de la machine de pose. D'une façon générale, les techniques précitées ne permettent pas d'optimiser réellement l'ouverture de la gaine avec un contrôle précis de la section de gaine sortant du mandrin conformateur pour arriver sur l'objet concerné. Ceci oblige alors à prévoir des gaines dont le diamètre est notablement supérieur à celui de l'objet à revêtir. La conséquence de ceci est que l'on ne parvient pas à un contrôle positionnel satisfaisant du manchon, tant axial que transversal. Ceci est particulièrement critique lorsqu'il s'agit de rétracter le manchon sur l'objet, dans la mesure où le manchon est imparfaitement positionné sur l'objet, et où de plus l'appel de rétraction est beaucoup plus fort. L'homme de l'art connaît bien les difficultés rencontrées dans de telles situations, en particulier dans la recherche du contrôle de la position et de la rétraction du manchon, et ce surtout si ledit manchon présente des impressions et/ou des décors imprimés.Finally, the shaping mandrels illustrated in the aforementioned documents do not really make it possible to solve the problem of the transfer of sheaths of very small diameters, since there are unavoidable phenomena of heating and wear, which phenomena are liable to deteriorate or even tear off. the continuous sheath transferred around the mandrel. This is even more true if one seeks to use the machine at high rates, for example from one hundred to two hundred sleeves installed per minute. Indeed, a sheath whose diameter is between 5 and 20 mm gives a flattened ribbon of reduced width (from 8 to 31 mm), and this flattened ribbon is then relatively rigid and difficult to tow. The high mechanical resistance implies high efforts to overcome, from which it follows the phenomena of heating and wear mentioned above. In addition, when the rates are high, the positional control of the objects moving under the shaper involves the use of pliers or the like, which further complicates the structure of the laying machine. In general, the above techniques do not not really optimize the opening of the sheath with precise control of the sheath section leaving the shaping mandrel to reach the object concerned. This then requires the provision of sheaths whose diameter is significantly greater than that of the object to be coated. The consequence of this is that we do not achieve satisfactory positional control of the sleeve, both axial and transverse. This is particularly critical when it comes to retracting the sleeve on the object, insofar as the sleeve is imperfectly positioned on the object, and where moreover the call for retraction is much stronger. Those skilled in the art are well aware of the difficulties encountered in such situations, in particular in seeking to control the position and the retraction of the sleeve, and this especially if said sleeve has prints and / or printed decorations.
L'invention vise précisément à résoudre ce problème, en concevant une machine de pose de manchons qui soit plus performante et ne présente pas les inconvénients précités.The invention aims precisely to solve this problem, by designing a sleeve fitting machine which is more efficient and does not have the aforementioned drawbacks.
L'invention a ainsi pour objet de concevoir une machine de pose de manchons en matière plastique thermoré¬ tractable sur des objets à partir d'une gaine continue enroulée à plat, qui soit tout-à-fait compatible avec des gaines de faibles diamètres, par exemple de diamètres compris entre 5 et 20 mm, tout en supportant des cadences élevées, c'est-à-dire dépassant largement deux cents manchons posés par minute, avec un contrôle positionnel optimal des manchons posés sur les objets. Ce problème est résolu conformément à l'invention grâce à une machine de pose de manchons en matière plasti¬ que thermorétractable sur des objets, à partir d'une gaine continue enroulée à plat , comportant un mandrin conformateur sur lequel passe la gaine pour s'ouvrir, un moyen d'entraî- nement de la gaine utilisant des galets motorisés qui coopèrent avec une partie associée du mandrin conformateur pour enfiler sur un objet l'extrémité ouverte de la gaine, et un moyen de coupe intervenant entre le mandrin confor¬ mateur et l'objet pour former un manchon associé audit objet, le mandrin conformateur étant sensiblement horizon¬ tal et comportant deux torpilles coaxiales reliées entre elles par un élément central filaire, avec une torpille amont présentant une extrémité amont formant une palette d'introduction et une extrémité aval à double biseau lisse, et une torpille aval présentant une extrémité amont à double biseau lisse et une extrémité aval à bord droit adjacent au moyen de coupe, chaque torpille dudit mandrin reposant librement sur un support en V associé, et le moyen d'entraînement de la gaine comportant, entre les deux supports en V, deux galets de pincement adjacents disposés symétriquement de part et d'autre de l'élément filaire du mandrin conformateur et passant au voisinage des bords lisses biseautés des torpilles, chaque galet présentant une gorge périphérique complémentaire de celle de l'autre galet afin de former un passage d'axe horizontal pour ledit élément filaire.The object of the invention is therefore to design a machine for laying sleeves in thermorelated plastic material ¬ which can be towed on objects from a continuous sheath wound flat, which is entirely compatible with sheaths of small diameters, for example of diameters between 5 and 20 mm, while supporting high rates, that is to say greatly exceeding two hundred sleeves placed per minute, with optimal positional control of the sleeves placed on the objects. This problem is solved according to the invention with a material for fitting sleeves machine plasticizer ¬ shrink on objects from a continuous sheath wound flat, comprising a shaping mandrel over which the sheath for s' open, a means of driving the sheath using motorized rollers which cooperate with an associated portion of the shaping mandrel to slide over an object the open end of the sheath, and a cutting means intervening between the mandrel accordance ¬ estimator and the object to form a sleeve associated with said object, the shaping mandrel is substantially horizon ¬ tal and comprising two coaxial torpedoes connected together by a wired central element, with an upstream torpedo having an upstream end forming an introduction pallet and a downstream end with a smooth double bevel, and a downstream torpedo having an upstream end with double smooth bevel and a downstream end with a straight edge adjacent to the cutting means, each torpedo of said mandrel freely resting on an associated V-shaped support, and the sheath drive means comprising, between the two V-shaped supports, two pinching rollers adjacent symmetrically arranged on either side of the wire element of the shaping mandrel and passing in the vicinity of the b smooth bevelled ords of the torpedoes, each roller having a peripheral groove complementary to that of the other roller in order to form a passage with a horizontal axis for said wire element.
Grâce à un tel agencement à deux torpilles horizontales reliées par un élément central filaire, et dont les extrémités à double biseau lisse sont exemptes de galets d'appui, on parvient à organiser l'ouverture et le transfert rapide de gaines continues de très faibles diamètres. De plus, le transfert horizontal facilite considérablement le contrôle positionnel des objets, même aux cadences élevées, par exemple en utilisant des roues à alvéoles.Thanks to such an arrangement with two horizontal torpedoes connected by a central wire element, and whose ends with smooth double bevel are free of support rollers, it is possible to organize the opening and rapid transfer of continuous sheaths of very small diameters . In addition, the horizontal transfer considerably facilitates the positional control of objects, even at high rates, for example by using cell wheels.
Il est à noter que les techniques à mandrin flottant illustrées dans les documents précités seraient totalement impraticables pour un transfert horizontal de gaine . De préférence, la palette d'introduction de la torpille amont s'étend dans un plan qui est sensiblement perpendiculaire au plan de pincement de la gaine continue entre les deux galets. Ceci permet une conformation de la gaine autour du mandrin qui confère à ladite gaine une section en forme d'as de carreau à la sortie d'un mandrin conformateur dont la torpille aval a une section sensible¬ ment circulaire, cette forme étant favorable d'une part pour le transfert en douceur de la gaine sur un objet cylindrique, et d'autre part pour l'organisation d'une coupe nette sans pliage de la gaine, en aval du mandrin conformateur. On pourra naturellement prévoir des formes spécifiques pour la section de sortie de la torpille aval en vue d'un préformage de la gaine adapté à la section de l'objet concerné. Avantageusement, la torpille amont et/ou la tor¬ pille aval présente deux facettes latérales planes sensi¬ blement perpendiculaires au plan de pincement de la gaine continue entre les deux galets. Ces facettes latérales planes diminuent le frottement latéral de la gaine sur les torpilles du manchon conformateur, ce qui est tout particulièrement favorable lorsque ladite gaine porte un dépôt de vernis ou autre sur sa paroi interne .It should be noted that the floating mandrel techniques illustrated in the aforementioned documents would be totally impractical for a horizontal sheath transfer. Preferably, the introduction palette of the upstream torpedo extends in a plane which is substantially perpendicular to the pinch plane of the continuous sheath between the two rollers. This allows shaping of the sheath around the mandrel which gives said sleeve a section shaped ace of diamonds at the output of a shaping mandrel whose downstream torpedo has a sensitive section ¬ circular, this form being favorable to on the one hand for the smooth transfer of the sheath onto a cylindrical object, and on the other hand for the organization of a clean cut without bending of the sheath, downstream of the shaping mandrel. Naturally, specific shapes can be provided for the outlet section of the downstream torpedo for the purpose of preforming the sheath adapted to the section of the object concerned. Advantageously, the upstream torpedo and / or tor ¬ sacking downstream has two plane side facets sensi ¬ ably perpendicular to the nip plane of the continuous sheath between the two rollers. These flat lateral facets reduce the lateral friction of the sheath on the torpedoes of the shaping sleeve, which is particularly favorable when said sheath carries a deposit of varnish or the like on its internal wall.
De préférence, l'élément filaire précité est un fil souple ancré à ses deux extrémités dans les torpilles, l'un des ancrages étant libérable de façon à pouvoir régler la longueur dudit élément filaire entre lesdites torpilles. Cet élément filaire sera par exemple constitué par un fil d'acier d'environ 1 mm de diamètre.Preferably, the above-mentioned wire element is a flexible wire anchored at its two ends in the torpedoes, one of the anchors being releasable so as to be able to adjust the length of said wire element between said torpedoes. This wire element will for example consist of a steel wire of about 1 mm in diameter.
De préférence encore, les doubles biseaux lisses des torpilles amont et aval sont formés de facettes planes inclinées agencées symétriquement par rapport à un plan médian passant par l'élément filaire et tangent aux deux galets de pincement .More preferably, the double smooth bevels of the upstream and downstream torpedoes are formed of inclined plane facets arranged symmetrically with respect to a median plane passing through the wire element and tangent to the two pinch rollers.
En particulier, le double biseau lisse de la torpille amont est formé de deux facettes planes inclinées d'environ 30° et les deux galets de pincement passent tangentiellement sur ce double biseau, tandis que le double biseau lisse de la torpille aval est formé de deux facettes planes plus faiblement inclinées. On pourra aussi prévoir un double biseau défini par deux inserts rapportés, de préférence interchangeables, dont les faces libres consti¬ tuent les facettes planes inclinées qui coopèrent avec les galets de pincement.In particular, the smooth double bevel of the upstream torpedo is formed by two inclined plane facets approximately 30 ° and the two pinch rollers pass tangentially over this double bevel, while the smooth double bevel of the downstream torpedo is formed by two planar facets more slightly inclined. We can also provide a double bevel defined by two inserts, preferably interchangeable, whose free faces consti ¬ kill the inclined plane facets which cooperate with the pinch rollers.
On pourra en outre prévoir une encoche longitudi- nale au fond de la gorge en V de chaque support de torpille : cette encoche facilite le passage du pli inférieur de la gaine et évite de froisser celle-ci.It is also possible to provide a longitudinal notch at the bottom of the V-shaped groove of each torpedo support: this notch facilitates the passage of the lower fold of the sheath and avoids creasing the latter.
Conformément à une autre caractéristique avantageuse, le moyen de coupe comporte une lame portée par un bras tournant d'axe horizontal, et ledit moyen est positionné de façon que sa lame rase le bord droit de l'extrémité aval de la torpille aval .According to another advantageous characteristic, the cutting means comprises a blade carried by a rotating arm with a horizontal axis, and said means is positioned so that its blade shaves the straight edge of the downstream end of the downstream torpedo.
De préférence alors, la lame de coupe présente deux bords de coupe rectilignes se rejoignant au niveau d'une arête d'attaque, et les deux bords de coupe sont sensiblement perpendiculaires, en étant agencés de façon que l'arête d'attaque contacte le sommet de la gaine au voisinage d'un angle de pliage de celle-ci résultant du passage de ladite gaine sur la palette d'introduction ou entre les deux galets de pincement.Preferably then, the cutting blade has two straight cutting edges meeting at a leading edge, and the two cutting edges are substantially perpendicular, being arranged so that the leading edge contacts the top of the sheath in the vicinity of a folding angle thereof resulting from the passage of said sheath on the insertion pallet or between the two pinch rollers.
Le moyen de coupe ainsi agencé permet d'obtenir une coupe parfaitement nette réalisée de façon progressive, sans pliage de la gaine, en un temps très bref.The cutting means thus arranged makes it possible to obtain a perfectly clean cut made progressively, without folding the sheath, in a very short time.
Conformément à une autre caractéristique avanta- geuse de l'invention, les deux galets de pincement sont revêtus d'un élastomère sur leur périphérie, et sont en contact l'un avec l'autre de part et d'autre de leur gorge périphérique qui est de forme trapézoïdale et présente deux facettes inclinées symétriquement par rapport à leur plan médian, en formant un V d'environ 60° d'ouverture, et les deux galets de pincement sont chanfreinés sur leurs arêtes d' extrémité .According to another advantageous characteristic of the invention, the two pinch rollers are coated with an elastomer on their periphery, and are in contact with each other on either side of their peripheral groove which is trapezoidal and has two facets inclined symmetrically with respect to their median plane, forming a V of approximately 60 ° of opening, and the two pinch rollers are chamfered on their end edges.
Avantageusement, les deux galets de pincement sont montés sur un bâti porteur qui peut pivoter, de préférence autour d'un axe vertical, en vue de permettre un dégagement latéral d'ensemble du moyen d'entraînement. Un tel dégagement permet alors une intervention rapide et aisée pour une opération de nettoyage ou de changement de format de gaine. D'autres caractéristiques et avantages de l'invention apparaîtront plus clairement à la lumière de la description qui va suivre et des dessins annexés, concer¬ nant un mode de réalisation particulier, en référence aux figures où : - les figures 1 et 2 illustrent en vue frontale et en vue latérale une machine de pose de manchons conforme à l'invention, ladite machine étant en outre équipée d'un tunnel de rétraction pour constituer une machine unitaire;Advantageously, the two pinch rollers are mounted on a support frame which can pivot, preferably about a vertical axis, in order to allow an overall lateral release of the drive means. Such a clearance then allows a quick and easy intervention for a cleaning operation or change of sheath format. Other features and advantages of the invention appear more clearly in light of the following description and the appended drawings, con ¬ ing a particular embodiment, with reference to the figures in which: - Figures 1 and 2 illustrate in front view and side view of a sleeve fitting machine according to the invention, said machine being further equipped with a retraction tunnel to constitute a unitary machine;
- la figure 3 est une vue en élévation montrant plus en détail le mandrin conformateur horizontal en deux torpilles et les deux galets de pincement adjacents disposés de part et d'autre de l'élément filaire reliant les deux torpilles ;- Figure 3 is an elevational view showing in more detail the horizontal shaping mandrel in two torpedoes and the two adjacent pinch rollers arranged on either side of the wire element connecting the two torpedoes;
- la figure 4 est une vue de dessus de l'ensemble illustré en figure 3,FIG. 4 is a top view of the assembly illustrated in FIG. 3,
- la figure 5 est une vue en élévation (partiellement en coupe) à plus grande échelle du mandrin conformateur horizontal, et la figure 6 une vue de dessus dudit mandrin ; - la figure 7 est une coupe selon VU-VU de la figure 3, et la figure 8 une vue partielle à plus grande échelle montrant le mandrin conformateur horizontal sur lequel passe la gaine ;- Figure 5 is an elevational view (partially in section) on a larger scale of the horizontal shaping mandrel, and Figure 6 a top view of said mandrel; - Figure 7 is a section along VU-VU of Figure 3, and Figure 8 a partial view on a larger scale showing the horizontal shaping mandrel over which the sheath passes;
- la figure 9 est une coupe selon IX- IX de la figure 3, et la figure 10 est une vue partielle à plus grande échelle permettant de mieux distinguer le passage d'axe horizontal délimité entre les deux galets de pince¬ ment adjacents;- Figure 9 is a section along IX- IX of Figure 3, and Figure 10 is a partial view more large scale making it possible to better distinguish the passage of horizontal axis delimited between the two gripper rollers ¬ ment adjacent;
- la figure 11 est une coupe selon XI-XI de la figure 3, et la figure 12 une coupe de détail à plus grande échelle analogue à celle de la figure 8 ;- Figure 11 is a section along XI-XI of Figure 3, and Figure 12 a detail section on a larger scale similar to that of Figure 8;
- la figure 13 est une vue de détail montrant l'arrêt de l'avancée de la gaine sur l'objet, juste avant la passe de coupe de la gaine ; - la figure 14 est un détail illustrant un objet dans une encoche du double barillet, revêtu d'un tronçon de gaine à section en forme d'as de carreau ;- Figure 13 is a detail view showing the stop of the advancement of the sheath on the object, just before the sheath cutting pass; - Figure 14 is a detail illustrating an object in a notch of the double barrel, coated with a sheath section with a section in the form of ace of diamonds;
- la figure 15 est une vue de détail illustrant un mode d'exécution préféré du moyen de coupe de la gaine; - la figure 16 est une vue de détail illustrant une variante dans laquelle l'extrémité aval de la torpille amont présente un double biseau lisse défini par deux inserts rapportés .- Figure 15 is a detail view illustrating a preferred embodiment of the sheath cutting means; - Figure 16 is a detail view illustrating a variant in which the downstream end of the upstream torpedo has a smooth double bevel defined by two added inserts.
Les figures 1 et 2 illustrent une machine 1 de pose de manchons en matière plastique thermoretractale sur des objets à partir d'une gaine continue enroulée à plat, agencée conformément à l'invention.FIGS. 1 and 2 illustrate a machine 1 for laying thermoretractal plastic sleeves on objects from a continuous sheath wound flat, arranged in accordance with the invention.
Cette machine comporte un bâti d'ensemble 2 surmonté d'un compartiment vitré 3 dans lequel sont disposés tous les organes mécaniques assurant l'amenée des objets, ainsi que le transfert horizontal d'une gaine continue enroulée à plat avec avancée progressive pour l'enveloppement de chaque objet individuel et la coupe de la gaine pour former un tronçon de gaine ou manchon. Une armoire de commande 4, supportée par une console pivotante 5 permet à l'opérateur de surveiller les différents paramètres de la machine de pose, et éventuellement de modifier certains réglages du cycle de fonctionnement.This machine comprises an overall frame 2 surmounted by a glazed compartment 3 in which are arranged all the mechanical members ensuring the supply of the objects, as well as the horizontal transfer of a continuous sheath wound flat with progressive advance for the wrapping each individual object and cutting the sheath to form a section of sheath or sleeve. A control cabinet 4, supported by a pivoting console 5 allows the operator to monitor the various parameters of the laying machine, and possibly to modify certain settings of the operating cycle.
Les objets allongés 10, par exemple des stylos à dessiner, arrivent par une goulotte d'entrée 6 jusqu'à un double barillet 7 entraîné en rotation par un moteur 8, le double barillet présentant des encoches périphériques 9 adaptées pour supporter en deux points chaque objet allongé 10. L'objet reçu dans deux encoches alignées 9 du double barillet 7 progresse alors du fait de la rotation du double barillet, et arrive au niveau d'un poste 11 de contrôle de présence d'objet (par exemple assuré au moyen d'un capteur optique), puis au niveau d'un poste 12 qui est le poste fondamental d'avance de gaine et de coupe pour définir un tronçon de gaine ou manchon revêtant l'objet 10. L'objet 10 revêtu de son manchon poursuit alors sa trajectoire circulaire pour arriver au niveau d'un guide inférieur 13 qui l'empêche de tomber, jusqu'à ce qu'il atteigne une goulotte de sortie 14, agencée ici au niveau de l'axe du double barillet 7, l'objet revêtu de son manchon tombant alors sur un convoyeur 16 qui se déplace horizontalement comme schématisé par la flèche 200. Les objets considérés comme défectueux, c'est-à-dire dont le manchon est mal positionné, passent dans une goulotte d'évacuation 15. Les objets 10 revêtus de leur manchon qui sont déposés sur le convoyeur 16 passent alors individuellement au niveau d'un tunnel de rétraction 17 équipé d'éléments chauffants (non représentés ici), par exemple des éléments infra-rouges, afin de réaliser la rétraction de chaque manchon sur l'objet associé. En sortie de la machine, les objets revêtus de leur manchon rétracté sont récupérés dans un bac 18.The elongated objects 10, for example drawing pens, arrive via an inlet chute 6 to a double barrel 7 driven in rotation by a motor 8, the double barrel having peripheral notches 9 adapted to support at each point each elongated object 10. The object received in two aligned notches 9 of the double barrel 7 then progresses due to the rotation of the double barrel, and arrives at a station 11 for controlling the presence of an object (for example provided by means of an optical sensor), then at a station 12 which is the basic station in advance of sheath and cutting to define a section of sheath or sleeve covering the object 10. The object 10 coated with its sleeve then continues its circular path to arrive at a lower guide 13 which prevents it from falling, until that it reaches an outlet chute 14, arranged here at the level of the axis of the double barrel 7, the object coated with its sleeve then falling on a conveyor 16 which moves horizontally as shown diagrammatically by the arrow 200. The objects considered res as defective, that is to say whose sleeve is badly positioned, pass through a discharge chute 15. The objects 10 coated with their sleeve which are deposited on the conveyor 16 then pass individually at a tunnel retraction 17 equipped with heating elements (not shown here), for example infrared elements, in order to carry out the retraction of each sleeve on the associated object. On leaving the machine, the objects coated with their retracted sleeve are collected in a tank 18.
La figure 2 permet de mieux distinguer une gaine continue 20, enroulée à plat en formant une bobine de réserve 21 montée sur un support fixe 22, qui est dévidée de cette bobine en passant sur différents rouleaux pour arriver au niveau d'un poste 12 de transfert horizontal de gaine. Pour l'entraînement de la gaine, il est prévu un moyen d'entraînement de gaine 90 avec deux galets motorisés 25, 26, dont l'entraînement est assuré par une courroie 27 passant autour de l'arbre de sortie d'un moteur d'entraînement 28. Ainsi qu'on le verra plus loin, la gaine est alors pincée entre les deux galets 25, 26 entre deux torpilles constituant le mandrin conformateur horizontal . La gaine arrive au niveau du poste de transfert 12, après être passée entre deux rouleaux de guidage 29 ici d'axe vertical, dans une position encore aplatie, la section de la gaine s 'étendant alors dans un plan sensiblement vertical. Un moyen de coupe 30, qui sera décrit plus en détail plus loin, est agencé en sortie de ce poste de transfert 12, au voisinage du double barillet 7, afin de couper l'extrémité de la gaine enfilée sur l'objet, pour définir un tronçon de gaine ou manchon.FIG. 2 makes it possible to better distinguish a continuous sheath 20, wound flat by forming a reserve reel 21 mounted on a fixed support 22, which is unwound from this reel passing over different rollers to arrive at a station 12 of horizontal sheath transfer. For the sheath drive, there is provided a sheath drive means 90 with two motorized rollers 25, 26, the drive of which is ensured by a belt 27 passing around the output shaft of a drive motor 28. As will be seen below, the sheath is then pinched between the two rollers 25, 26 between two torpedoes constituting the horizontal shaping mandrel. The sheath arrives at the transfer station 12, after having passed between two guide rollers 29 here with a vertical axis, in a still flattened position, the section of the sheath then extending in a substantially vertical plane. A cutting means 30, which will be described in more detail below, is arranged at the outlet of this transfer station 12, in the vicinity of the double barrel 7, in order to cut the end of the sheath threaded on the object, to define a section of sheath or sleeve.
Le moyen d'entraînement de gaine 90 et ses deux galets motorisés 25, 26 sont en l'espèce montés sur un bâti porteur 23 agencé sous la forme d'une tourelle assujettie à une traverse fixe 24, en pouvant pivoter autour d'un axe vertical 19. Un tel montage pivotant permet un dégagement latéral d'ensemble du moyen d'entraînement 90. Ceci est très avantageux dans la pratique, car un opérateur peut intervenir rapidement et aisément, grâce à l'accès dégagé aux composants du moyen d'entraînement, pour une opération de nettoyage ou d'entretien, ou encore de changement de format de gaine. Une fois l'opération réalisée, l'opérateur ramène l'équipage mobile dans sa position de fonctionnement, et l'ensemble revient directement dans la position d'alignement avec l'objet. Ce montage pivotant permet, en plus des possibilités d'interventions rapides, une réalisa¬ tion très compacte des moyens d'entraînement de la machine de pose.The sheath drive means 90 and its two motorized rollers 25, 26 are in this case mounted on a support frame 23 arranged in the form of a turret secured to a fixed cross member 24, being able to pivot about an axis vertical 19. Such a pivoting assembly allows overall lateral clearance of the drive means 90. This is very advantageous in practice, because an operator can intervene quickly and easily, thanks to the clear access to the components of the drive means. drive, for a cleaning or maintenance operation, or to change the size of the sheath. Once the operation has been carried out, the operator brings the mobile assembly back to its operating position, and the assembly returns directly to the position of alignment with the object. This swivel mount allows more opportunities for rapid, realized a very compact ¬ laying machine drive means.
On va maintenant décrire plus en détail l'agencement du mandrin conformateur horizontal et des deux galets de pincement associés, en se référant aux figures 3 à 12. Comme dans la technique antérieure, la machine de pose comporte un mandrin conformateur sur lequel passe la gaine pour s'ouvrir, un moyen d'entraînement de la gaine utilisant des galets motorisés qui coopèrent avec une partie associée du mandrin conformateur pour enfiler sur un objet l'extrémité ouverte de la gaine, et un moyen de coupe intervenant entre le mandrin conformateur et le barillet support d'objets pour former un manchon associé audit objet .We will now describe in more detail the arrangement of the horizontal shaping mandrel and the two associated pinching rollers, with reference to FIGS. 3 to 12. As in the prior art, the laying machine comprises a shaping mandrel over which the sheath to open, a means of driving the sheath using motorized rollers which cooperate with an associated part of the shaping mandrel to thread onto an object the open end of the sheath, and a cutting means intervening between the shaping mandrel and the object support barrel to form a sleeve associated with said object.
Le mandrin conformateur 40 de la machine de pose conforme à l'invention est cependant agencé de façon très particulière ainsi que cela va être décrit maintenant. Le mandrin conformateur 40 est en effet sensiblement horizontal (par référence à son axe 100) et comporte deux torpilles coaxiales 41, 42 reliées entre elles par un élément central filaire 43. On trouve ainsi une torpille amont 41 présentant une extrémité amont 44 formant une palette d'introduction et une extrémité aval 45 à double biseau lisse (c'est-à-dire exempte de galets d'appui), et une torpille aval 42 présentant une extrémité amont 46 à double biseau lisse (c'est-à-dire exempte de galets d'appui) et une extrémité aval 47 à bord droit 51 adjacent au moyen de coupe 30. Les termes "amont" et "aval" sont utilisés ici par référence au sens de défilement de la gaine, qui est schématisé sur les figures 3 et 4 par la flèche 101.The shaping mandrel 40 of the laying machine according to the invention is however arranged in a very particular way as will now be described. The shaping mandrel 40 is in fact substantially horizontal (with reference to its axis 100) and comprises two coaxial torpedoes 41, 42 linked together by a wired central element 43. There is thus an upstream torpedo 41 having an upstream end 44 forming a pallet introduction and a downstream end 45 with a smooth double bevel (that is to say free from support rollers), and a downstream torpedo 42 having an upstream end 46 with a smooth double bevel (that is to say free of support rollers) and a downstream end 47 with a straight edge 51 adjacent to the cutting means 30. The terms “upstream” and “downstream” are used here with reference to the direction of travel of the sheath, which is shown diagrammatically on the Figures 3 and 4 by arrow 101.
L'élément filaire 43, qui est par exemple consti- tué par un fil souple d'acier d'environ 1 mm de diamètre, est ancré à ses deux extrémités 52, 53 dans les torpilles 41, 42. L'extrémité 52 est une olive d'extrémité qui permet un ancrage en butée par coincement naturel, tandis que l'extrémité 53 est fixée par un ancrage qui est libérable. On distingue en particulier sur la figure 5 un tel système d'ancrage libérable, utilisant un mors de serrage 54 à surface extérieure conique, en appui contre un cône de butée 55, ainsi qu'une douille de serrage 56 engagée dans un filetage débouchant associé 57 de la torpille aval 42. Le vissage de la douille 56 dans le filetage associé 57 permet de pousser le mors de serrage 54 contre le cône de butée 55, et assure alors un parfait ancrage de l'extrémité 53 de l'élément filaire 43. En dévissant cette douille 56, on peut alors faire coulisser le fil d'acier dans les éléments d'ancrage, et ainsi régler la position du fil par rapport à la torpille aval 42. Cette possibilité de réglage est intéressante dans la pratique, car elle permet de régler la longueur de l'élément filaire 43 entre les torpilles horizontales 41, 42. Ce réglage est important dans la mesure où les galets de pincement 25, 26 viennent précisément se loger entre les extrémités en regard des torpilles 41, 42 tout en passant sur l'élément filaire 43.The wire element 43, which is for example constituted by a flexible steel wire of approximately 1 mm in diameter, is anchored at its two ends 52, 53 in the torpedoes 41, 42. The end 52 is a end olive which allows an anchoring in abutment by natural wedging, while the end 53 is fixed by an anchoring which is releasable. We distinguish in particular in Figure 5 such a releasable anchoring system, using a clamping jaw 54 with conical outer surface, bearing against a stop cone 55, as well as a clamping sleeve 56 engaged in an associated through thread 57 of the downstream torpedo 42. The screwing of the sleeve 56 in the associated thread 57 pushes the clamping jaw 54 against the stop cone 55, and then ensures perfect anchoring of the end 53 of the wire element 43. By unscrewing this socket 56, it is then possible to slide the steel wire into the anchoring elements, and thus adjust the position of the wire relative to the downstream torpedo 42. This possibility of adjustment is advantageous in practice, because it makes it possible to adjust the length of the wire element 43 between the horizontal torpedoes 41, 42. This adjustment is important insofar as the pinching rollers 25, 26 are precisely housed between the opposite ends of the torpedoes 41, 42 while passing over the wire element 43.
L'extrémité aval 45 de la torpille amont 41 et l'extrémité amont 46 de la torpille aval 42 sont conformées pour présenter un double biseau lisse. Les doubles biseaux notés 48 et 49 des torpilles amont 41 et aval 42 sont formés de facettes planes inclinées agencées symétriquement par rapport à un plan médian passant par l'élément filaire 43 et tangent aux galets 25, 26. Comme cela est mieux visible sur la figure 5, le double biseau lisses 48 de la torpille amont est formé de deux facettes planes inclinées, par exemple d'un angle de l'ordre de 30°, et les deux galets de pincement 25, 26 passent tangentiellement sur ce double biseau lisse. Compte tenu des frottements importants intervenant au niveau du double biseau lisse 48 de la torpille amont 41, on pourra prévoir que ce double biseau 48 soit défini par des inserts rapportés. Le détail de la figure 16 illustre une telle variante et montre une extrémité 45 de la torpille amont 41 équipée de plaquettes 75, qui sont de préférence interchangeables, dont les faces libres constituent les facettes planes inclinées qui coopèrent avec les galets de pincement 25, 26. Ces plaquettes 75 pourront être réalisées en tout matériau adéquat, tel que matière plastique ou céramique. L'état de surface est alors parfaitement maîtrisé au niveau du double biseau lisse 48. Le double biseau lisse 49 de la torpille aval est quant à lui formé de deux facettes plus faiblement incli¬ nées .The downstream end 45 of the upstream torpedo 41 and the upstream end 46 of the downstream torpedo 42 are shaped to have a smooth double bevel. The double bevels denoted 48 and 49 of the upstream 41 and downstream torpedoes 42 are formed of inclined plane facets arranged symmetrically with respect to a median plane passing through the wire element 43 and tangent to the rollers 25, 26. As this is better visible on the FIG. 5, the smooth double bevel 48 of the upstream torpedo is formed by two inclined plane facets, for example by an angle of the order of 30 °, and the two pinch rollers 25, 26 pass tangentially over this smooth double bevel . Given the significant friction occurring at the level of the smooth double bevel 48 of the upstream torpedo 41, provision could be made for this double bevel 48 to be defined by added inserts. The detail in FIG. 16 illustrates such a variant and shows an end 45 of the upstream torpedo 41 fitted with plates 75, which are preferably interchangeable, the free faces of which constitute the inclined plane facets which cooperate with the pinch rollers 25, 26 These plates 75 can be made of any suitable material, such as plastic or ceramic. The surface condition is then perfectly controlled at the level of the double bevel smooth 48. The pair of smooth chamfers of the downstream torpedo 49 is in turn formed by two facets more weakly INCLI ¬ born.
S 'agissant d'un transfert de gaine horizontal (le mandrin conformateur reste en effet toujours sensiblement horizontal) , chaque torpille 41, 42 du mandrin conformateur 40 repose librement sur un support en V 60 associé, les deux galets d'entraînement 25, 26 étant agencés entre ces deux supports en V. La coupe de la figure 7 et le détail de la figure 8 permettent de mieux distinguer l'un de ces supports 60, avec ses facettes en V notées 60.1 pour un parfait centrage axial des torpilles. Les supports 60 sont ici complétés par une butée supérieure 61 évitant le soulèvement de la torpille 41. On notera également la présence d'une encoche longitudinale 60.2 au fond de la gorge en V de chaque support 60. Cette encoche facilite le passage du pli inférieur de la gaine en fond de gorge, et diminue sensiblement le frottement, de sorte que l'on parvient à tracter la gaine plus librement, sans risque de froissement de celle-ci.In the case of a horizontal sheath transfer (the shaping mandrel in fact always remains substantially horizontal), each torpedo 41, 42 of the shaping mandrel 40 rests freely on an associated V-shaped support 60, the two drive rollers 25, 26 being arranged between these two V-shaped supports. The section in FIG. 7 and the detail in FIG. 8 make it possible to better distinguish one of these supports 60, with its V-shaped facets denoted 60.1 for perfect axial centering of the torpedoes. The supports 60 are here supplemented by an upper stop 61 avoiding the lifting of the torpedo 41. It will also be noted the presence of a longitudinal notch 60.2 at the bottom of the V-shaped groove of each support 60. This notch facilitates the passage of the lower fold of the sheath at the bottom of the groove, and significantly reduces friction, so that it is possible to tow the sheath more freely, without the risk of wrinkling thereof.
Les figures 7 et 8 montrent également la présence, sur la torpille 41, de deux facettes latérales planes 58, sensiblement perpendiculaires au plan de pincement de la gaine continue entre les deux galets 25, 26. Ces facettes latérales planes 58 permettent d'éviter un appui latéral excessif de la gaine, ce qui est particulièrement intéressant lorsque la gaine est revêtue d'un vernis spécial ou autre sur sa face interne.FIGS. 7 and 8 also show the presence, on the torpedo 41, of two planar lateral facets 58, substantially perpendicular to the plane of gripping of the continuous sheath between the two rollers 25, 26. These planar lateral facets 58 make it possible to avoid a excessive lateral support of the sheath, which is particularly advantageous when the sheath is coated with a special varnish or the like on its internal face.
La gaine 20 passant sur la palette d'introduction 44 est plate, mais elle s'ouvre progressivement en passant sur la partie principale de la torpille amont 41 dont la section est sensiblement circulaire. Bien que cela ne soit pas représenté sur les figures 7 et 8, la gaine présentera dans la pratique un léger pliage en haut et en bas de la gaine qui résulte de sa forme aplatie initiale. Ainsi que cela est mieux visible sur les figures 9 et 10, les deux galets de pincement adjacents 25, 26 sont disposés symétriquement de part et d'autre de l'élément filaire 43 du mandrin conformateur horizontal 40, et chaque galet 25, 26 présente une gorge périphérique complémentaire 65, 66 de celle de l'autre galet 26, 25 afin de former un passage 67 d'axe horizontal pour ledit élément filaire. Comme cela est visible sur la figure 3, les galets de pincement adjacents 25, 26 passent également au voisinage des bords lisses biseautés des torpilles 41, 42, c'est-à- dire des facettes planes inclinées 48 de la torpille amont 41 et 49 de la torpille aval 42. La gaine 20 passant sur la torpille amont 41 et arrivant au niveau du double biseau lisse 48 est alors pincée par les deux rouleaux 25, 26 qui aplatissent la gaine sur l'élément filaire 43 tout en la transférant horizontalement, et la gaine n'est aucunement bloquée sur cet élément filaire, grâce à la présence des gorges périphériques 65, 66 qui définissent le passage 67. Sur la figure 9, on distingue aussi les boîtiers 62, 63 portant les galets 25, 26, et, de l'autre côté de ces boîtiers, les poulies 64 sur lesquelles passe la courroie de transmission 27 précitée servant à entraîner en rotation les galets 25, 26.The sheath 20 passing over the insertion pallet 44 is flat, but it opens gradually by passing over the main part of the upstream torpedo 41, the section of which is substantially circular. Although this is not shown in Figures 7 and 8, the sheath will in practice have a slight bending at the top and bottom of the sheath which results from its initial flattened shape. As is best seen in Figures 9 and 10, the two adjacent pinch rollers 25, 26 are arranged symmetrically on either side of the wire element 43 of the horizontal shaping mandrel 40, and each roller 25, 26 has a peripheral groove 65, 66 complementary to that of the other roller 26, 25 in order to form a passage 67 of horizontal axis for said wire element. As can be seen in FIG. 3, the adjacent pinching rollers 25, 26 also pass in the vicinity of the bevelled smooth edges of the torpedoes 41, 42, that is to say inclined plane facets 48 of the upstream torpedo 41 and 49 downstream torpedo 42. The sheath 20 passing over the upstream torpedo 41 and arriving at the level of the double smooth bevel 48 is then pinched by the two rollers 25, 26 which flatten the sheath on the wire element 43 while transferring it horizontally, and the sheath is in no way blocked on this wire element, thanks to the presence of the peripheral grooves 65, 66 which define the passage 67. In FIG. 9, there are also the housings 62, 63 carrying the rollers 25, 26, and , on the other side of these housings, the pulleys 64 on which the aforementioned transmission belt 27 passes, serving to rotate the rollers 25, 26.
L'agencement des galets 25, 26 est représenté plus en détail sur la figure 10.The arrangement of the rollers 25, 26 is shown in more detail in FIG. 10.
Sur cette figure, on constate que les galets 25, 26 sont en contact l'un avec l'autre de part et d'autre de leur gorge périphérique 65, 66. Dans la pratique, les deux galets de pincement 25, 26 seront revêtus d'un élastomère sur leur périphérie, par exemple du polyurethane de dureté adéquate. La gorge périphérique 65, 66 de l'un au moins des deux galets de pincement 25, 26 (en l'espèce des deux galets) peut être de forme trapézoïdale comme cela est illustré sur la figure 10 (on pourra bien entendu en variante prévoir une forme différente, notamment une forme en V traditionnel) . Ces deux gorges 65, 66 présentent alors deux facettes inclinées 68, 69, l'inclinaison étant symétrique par rapport au plan médian noté P des deux galets 25, 26, en formant un V d'environ 60° d'ouverture. Ces facettes 68, 69 participent au guidage d'ensemble, et évitent tout décalage latéral de la gaine en défilement qui passe sur l'élément filaire 43. On notera également la présence de chanfreins 70, 71 sur les arêtes d'extrémité des galets 25, 26. Ces chanfreins 70, 71 permettent d'éviter un écrasement excessif de la gaine 20, qui créerait un pli au voisinage des bords de ladite gaine dont le marquage important serait difficile à éliminer lors de la rétraction du manchon sur l'objet. L'élément filaire 43 reste positionné dans le plan médian P, grâce au position- nement correct des torpilles amont 41 et aval 42 formant le mandrin conformateur horizontal 40.In this figure, it can be seen that the rollers 25, 26 are in contact with each other on either side of their peripheral groove 65, 66. In practice, the two pinch rollers 25, 26 will be coated an elastomer on their periphery, for example polyurethane of adequate hardness. The peripheral groove 65, 66 of at least one of the two pinch rollers 25, 26 (in the case of the two rollers) may be of trapezoidal shape as illustrated in FIG. 10 (it will of course be possible to provide a different shape, including a shape in traditional V). These two grooves 65, 66 then have two inclined facets 68, 69, the inclination being symmetrical relative to the median plane denoted P of the two rollers 25, 26, forming a V of approximately 60 ° opening. These facets 68, 69 participate in the overall guidance, and avoid any lateral offset of the sheath in movement which passes over the wire element 43. It will also be noted the presence of chamfers 70, 71 on the end edges of the rollers 25 , 26. These chamfers 70, 71 make it possible to avoid excessive crushing of the sheath 20, which would create a fold in the vicinity of the edges of said sheath, the significant marking of which would be difficult to remove during the retraction of the sleeve on the object. The wire element 43 remains positioned in the median plane P, thanks to the correct positioning of the upstream 41 and downstream torpedoes 42 forming the horizontal shaping mandrel 40.
En aval de la paire de galets 25, 26, la gaine 20 passe sur la torpille aval 42, et le bord libre de ladite gaine arrive au niveau du bord libre 51 de ladite torpille, qui est ici un bord circulaire droit. Les figures 11 et 12 permettent de distinguer des facettes latérales planes 59 également prévues sur la torpille aval 42 pour éviter un frottement excessif, de la même façon que les facettes 58 de la torpille amont 41. Bien que cela ne soit pas visible sur la figure 12, la gaine qui passe horizontalement entre les supports 60, 61 et la torpille aval 42 présentera dans la réalité un pliage léger selon quatre arêtes lui conférant une section en as de carreau. Les plis supérieur et inférieur correspondent au passage de la gaine sur la palette d'introduction 44, et les deux plis latéraux correspondent au passage entre les deux galets de pincement 25, 26 adjacents.Downstream of the pair of rollers 25, 26, the sheath 20 passes over the downstream torpedo 42, and the free edge of said sheath arrives at the free edge 51 of said torpedo, which here is a straight circular edge. FIGS. 11 and 12 make it possible to distinguish plane lateral facets 59 also provided on the downstream torpedo 42 to avoid excessive friction, in the same way as the facets 58 of the upstream torpedo 41. Although this is not visible in the figure 12, the sheath which passes horizontally between the supports 60, 61 and the downstream torpedo 42 will in reality have a slight bending along four edges giving it a section in ace of diamonds. The upper and lower folds correspond to the passage of the sheath on the insertion pallet 44, and the two lateral folds correspond to the passage between the two pinch rollers 25, 26 adjacent.
La forme en as de carreau pour la section de la gaine 20 est intéressante dans la mesure où le quadrilatère ainsi formé vient juste passer sur la section de l'objet 10 à revêtir en glissant légèrement sur cet objet. Ceci est favorable pour l'obtention d'un positionnement axial et transversal très précis du manchon sur l'objet. De plus, lorsque l'objet revêtu de son manchon arrive dans le tunnel de rétraction, l'appel de rétraction est limité, dans la mesure où la gaine tangente l'objet à revêtir au niveau de quatre zones latérales, l'appel de rétraction concernant principalement les quatre arêtes légèrement marquées .The form of ace of diamonds for the section of the sheath 20 is advantageous insofar as the quadrilateral thus formed just passes over the section of the object 10 to be coated by sliding lightly on this object. This is favorable for obtaining a very precise axial and transverse positioning of the sleeve on the object. In addition, when the object coated with its sleeve arrives in the retraction tunnel, the retraction call is limited, insofar as the sheath tangents the object to be coated at four lateral zones, the retraction call mainly concerning the four slightly marked edges.
La forme circulaire de la section de sortie de la torpille aval 42 ne constitue naturellement qu'un exemple, et l'on pourra prévoir d'autres formes spécifiques (en carré, en losange ou en ellipse) en fonction de la forme de l'objet concerné, afin de réaliser une préforme de la gaine en sortie du conformateur qui est parfaitement adaptée à la section de l'objet. Ceci facilite la mise en place précise, et autorise des cadences de pose élevées pouvant dépasser deux cents manchons posés à la minute.The circular shape of the outlet section of the downstream torpedo 42 is naturally only an example, and other specific shapes (square, diamond or ellipse) can be provided depending on the shape of the object concerned, in order to produce a preform of the sheath at the outlet of the former which is perfectly adapted to the section of the object. This facilitates precise positioning, and allows high installation rates that can exceed two hundred sleeves installed per minute.
Sur la figure 3, on a également représenté un moyen de coupe 30, constitué par une lame 31 montée sur un bras 32 qui est tournant autour d'un axe horizontal 32', en étant entraîné par un moteur associé 33. Le plan noté 50 de passage de la lame tournante 31 sera dans la pratique directement adjacent au bord droit 51 de la torpille aval 42, ce qui participe à l'élaboration d'une coupe précise sans pliage de la gaine lors de cette phase de coupe. On pourrait bien entendu prévoir un moyen de coupe du type à guillotine, mais les essais menés par la demanderesse ont montré qu'une lame tournante, avec en plus le choix d'un agencement particulier qui sera décrit plus loin en référence à la figure 15, donne d'excellents résultats pour l'obtention d'une coupe parfaitement nette.In Figure 3, there is also shown a cutting means 30, consisting of a blade 31 mounted on an arm 32 which rotates about a horizontal axis 32 ', being driven by an associated motor 33. The plane denoted 50 passage of the rotating blade 31 will in practice be directly adjacent to the straight edge 51 of the downstream torpedo 42, which participates in the development of a precise cut without folding the sheath during this cutting phase. We could of course provide a guillotine type cutting means, but the tests carried out by the applicant have shown that a rotating blade, with the additional choice of a particular arrangement which will be described later with reference to FIG. 15 , gives excellent results for obtaining a perfectly clean cut.
Comme cela est visible sur la figure 13, la gaine continue 20 dépasse le bord droit 51 de la torpille aval 42, pour venir s'enfiler sur l'objet 10 à revêtir, et ce sur une longueur prédéterminée à l'avance (qui peut même aller jusqu'à la longueur totale de l'objet) . Une fois cet avancement atteint, l'entraînement des galets motorisés 25, 26 est arrêté, et la coupe intervient, au niveau du plan de coupe 50. Le détail de la figure 14 permet de bien distin- guer l'élément 10 reçu dans une encoche 9 du double barillet 7, avec la gaine 20 en forme d'as de carreau qui le recouvre. Une fois la coupe effectuée, le tronçon de gaine ainsi désolidarisé forme un manchon 80 qui est destiné à être ensuite rétracté sur l'objet 10 au niveau du tunnel de rétraction 17 de la machine de pose.As can be seen in FIG. 13, the continuous sheath 20 extends beyond the straight edge 51 of the downstream torpedo 42, to thread onto the object 10 to be coated, and this over a length predetermined in advance (which can even go to the total length of the object). Once this advancement has been achieved, the drive of the motorized rollers 25, 26 is stopped, and the cutting takes place, at the level of the cutting plane 50. The detail in FIG. 14 makes it possible to clearly distinguish the element 10 received in a notch 9 of the double barrel 7, with the sheath 20 in the form of an ace of diamonds which covers it. Once the cut has been made, the sheath section thus separated forms a sleeve 80 which is intended to be then retracted on the object 10 at the level of the retraction tunnel 17 of the laying machine.
On va maintenant décrire un mode de réalisation préféré pour le moyen de coupe 30, en se référant à la figure 15.We will now describe a preferred embodiment for the cutting means 30, with reference to FIG. 15.
Sur cette figure 15, on distingue le moyen de coupe 30, avec sa lame 31 portée par un bras tournant 32 d'axe horizontal 32' parallèle à l'axe des torpilles 41, 42, ledit moyen étant de préférence, comme cela a été décrit plus haut, positionné de façon que sa lame 31 rase le bord droit 51 de l'extrémité aval 47 de la torpille aval 42. En l'espèce, la lame de coupe 31 présente deux bords de coupe rectilignes, notés 31.1, 31.2 se rejoignant au niveau d'une arête d'attaque notée 31.3. Les deux bords de coupe 31.1, 31.2 sont de préférence sensiblement perpendiculaires, et agencés de façon que l'arête d'attaque 31.3 contacte un sommet de la gaine 20 au voisinage d'un angle de pliage de celle-ci résultant du passage de ladite gaine sur la palette d'introduction 44 ou entre les deux galets de pincement 25, 26. En l'espèce, on a illustré un agencement des deux bords de coupe 31.1, 31.2, avec une attaque au niveau de l'angle de pliage supérieur 20' de la gaine 20, mais il va de soi que l'on pourrait prévoir une attaque selon un autre angle de pliage. Cet agencement des bords de coupe et de l'arête d'attaque de la lame 31, permet d'effectuer une coupe extrêmement satisfaisante de la gaine 20 grâce à l'effet massue de la percussion exercée au niveau de l'angle de pliage 20', et suivi immédiatement par une coupe du bord supérieur gauche de la gaine réalisée par le bord 31.1 de la lame, avec simultanément l'attaque progressive du bord supérieur droit puis du bord inférieur droit par le bord de coupe 31.2. Cette double coupe progressive s'effectue sans pliage, avec un effet de cisaillement qui est extrêmement favorable pour la netteté de la découpe de la paroi de la gaine.In this FIG. 15, a distinction is made between the cutting means 30, with its blade 31 carried by a rotating arm 32 of horizontal axis 32 'parallel to the axis of the torpedoes 41, 42, said means preferably being, as has been described above, positioned so that its blade 31 shaves the straight edge 51 of the downstream end 47 of the downstream torpedo 42. In this case, the cutting blade 31 has two straight cutting edges, noted 31.1, 31.2 joining at an attack edge noted 31.3. The two cutting edges 31.1, 31.2 are preferably substantially perpendicular, and arranged so that the leading edge 31.3 contacts a top of the sheath 20 in the vicinity of a bending angle of the latter resulting from the passage of said sheath on the insertion pallet 44 or between the two pinching rollers 25, 26. In the present case, an arrangement of the two cutting edges 31.1, 31.2 has been illustrated, with an attack at the level of the upper folding angle 20 'of the sheath 20, but it goes without saying that one could provide an attack from another angle of folding. This arrangement of the cutting edges and the leading edge of the blade 31 makes it possible to make an extremely satisfactory cut of the sheath 20 thanks to the massive effect of the percussion exerted on the level of the bending angle 20 ′, and immediately followed by a cut of the upper left edge of the sheath produced by the edge 31.1 of the blade, simultaneously with the progressive attack on the upper right edge and then on the lower right edge by the edge cutting 31.2. This progressive double cutting is carried out without folding, with a shearing effect which is extremely favorable for the sharpness of the cutting of the wall of the sheath.
On est ainsi parvenu à réaliser une machine de pose de manchons thermoretractables qui est parfaitement adaptée au transfert et à la pose de manchons de faibles diamètres, c'est-à-dire par exemple de diamètres compris entre 5 et 20 mm, et ce avec des cadences de pose pouvant dépasser largement deux cents manchons par minute. Le transfert horizontal de la gaine s'effectue de façon totalement contrôlée, sans pincement excessif de celle-ci, et sans génération de phénomènes d' échauffement ou d'usure défavorables .We have thus achieved a machine for applying heat-shrinkable sleeves which is perfectly suited to the transfer and installation of sleeves of small diameters, that is to say for example of diameters between 5 and 20 mm, and this with laying rates that can greatly exceed two hundred sleeves per minute. The horizontal transfer of the sheath takes place in a completely controlled manner, without excessive pinching of the latter, and without generation of unfavorable heating or wear phenomena.
L'invention n'est pas limitée aux modes de réalisation qui viennent d'être décrits, mais englobe au contraire toute variante reprenant, avec des moyens équivalents, les caractéristiques essentielles énoncées plus haut . The invention is not limited to the embodiments which have just been described, but on the contrary encompasses any variant incorporating, with equivalent means, the essential characteristics set out above.

Claims

REVENDICATIONS 1. Machine (1) de pose de manchons en matière plastique thermorétractable sur des objets (10), à partir d'une gaine continue (20) enroulée à plat, comportant un mandrin conformateur (40) sur lequel passe la gaine pour s'ouvrir, un moyen d'entraînement (90) de la gaine utili¬ sant des galets motorisés qui coopèrent avec une partie associée du mandrin conformateur pour enfiler sur un objet l'extrémité ouverte de la gaine, et un moyen de coupe (30) intervenant entre le mandrin conformateur (40) et l'objet (10) pour former un manchon (80) associé audit objet, caractérisée en ce que le mandrin conformateur (40) est sensiblement horizontal et comporte deux torpilles coaxia¬ les (41, 42) reliées entre elles par un élément central filaire (43), avec une torpille amont (41) présentant une extrémité amont formant une palette d'introduction (44) et une extrémité aval (45) à double biseau lisse, et une torpille aval (42) présentant une extrémité amont (46) à double biseau lisse et une extrémité aval (47) à bord droit (51) adjacent au moyen de coupe (30) , chaque torpille (41, 42) dudit mandrin reposant librement sur un support en V (60) associé, et le moyen d'entraînement (90) de la gaine comporte, entre les deux supports en V (60) , deux galets de pincement adjacents (25, 26) disposés symétriquement de part et d'autre de l'élément filaire (43) du mandrin conformateur (40) et passant au voisinage des bords lisses biseautés des torpilles (41, 42), chaque galet (25, 26) présentant une gorge périphérique complémentaire (65, 66) de celle de l'autre galet (26, 25) afin de former un passage (67) d'axe horizontal pour ledit élément filaire. CLAIMS 1. Machine (1) for laying sleeves in heat-shrinkable plastic on objects (10), from a continuous sheath (20) wound flat, comprising a shaping mandrel (40) over which the sheath passes for s opening, drive means (90) of the sheath utili ¬ sant motorized rollers which cooperate with an associated portion of the shaping mandrel to slide over an object the open end of the sheath, and a cutting means (30) intervening between the shaping mandrel (40) and the object (10) to form a sleeve (80) associated with said object, characterized in that the shaping mandrel (40) is substantially horizontal and comprises two torpedoes CoAxia ¬ (41, 42 ) interconnected by a wired central element (43), with an upstream torpedo (41) having an upstream end forming an insertion pallet (44) and a downstream end (45) with a smooth double bevel, and a downstream torpedo ( 42) having an upstream end ( 46) with a smooth double bevel and a downstream end (47) with a straight edge (51) adjacent to the cutting means (30), each torpedo (41, 42) of said mandrel freely resting on an associated V-shaped support (60), and the drive means (90) of the sheath comprises, between the two V-shaped supports (60), two adjacent pinching rollers (25, 26) arranged symmetrically on either side of the wire element (43) of the shaping mandrel (40) and passing in the vicinity of the smooth bevelled edges of the torpedoes (41, 42), each roller (25, 26) having a peripheral groove complementary (65, 66) to that of the other roller (26, 25) to form a passage (67) with a horizontal axis for said wire element.
2. Machine de pose de manchons selon la revendi¬ cation 1, caractérisée en ce que la palette d'introduction (44) de la torpille amont (41) s'étend dans un plan qui est sensiblement perpendiculaire au plan de pincement de la gaine continue entre les deux galets (25, 26) . 2. Sleeve fitting machine as claimed in claim 1, characterized in that the insertion pallet (44) of the upstream torpedo (41) extends in a plane which is substantially perpendicular to the pinch plane of the sheath continues between the two rollers (25, 26).
3. Machine de pose de manchons selon la revendication 2, caractérisée en ce que la torpille amont (41) et/ou la torpille aval (42) présente deux facettes latérales planes (58, 59) sensiblement perpendiculaires au plan de pincement de la gaine continue entre les deux galets (25, 26) .3. Sleeve fitting machine according to claim 2, characterized in that the upstream torpedo (41) and / or the downstream torpedo (42) has two flat lateral facets (58, 59) substantially perpendicular to the pinch plane of the sheath continues between the two rollers (25, 26).
4. Machine de pose de manchons selon l'une des revendications 1 à 3, caractérisée en ce que l'élément filaire (43) est un fil souple ancré à ses deux extrémités (52, 53) dans les torpilles (41, 42), l'un des ancrages étant libérable de façon à pouvoir régler la longueur dudit élément filaire entre lesdites torpilles.4. Sleeve fitting machine according to one of claims 1 to 3, characterized in that the wire element (43) is a flexible wire anchored at its two ends (52, 53) in the torpedoes (41, 42) , one of the anchors being releasable so as to be able to adjust the length of said wire element between said torpedoes.
5. Machine de pose de manchons selon la revendi¬ cation 4, caractérisée en ce que l'élément filaire (43) est constitué par un fil d'acier d'environ 1 mm de diamètre.5. sleeve-fitting machine according to revendi ¬ cation 4, characterized in that the wire element (43) is constituted by a steel wire of 1 mm diameter.
6. Machine de pose de manchons selon l'une des revendications 1 à 5, caractérisée en ce que les doubles biseaux lisses (48, 49) des torpilles amont (41) et aval 42) sont formés de facettes planes inclinées agencées symétriquement par rapport à un plan médian passant par l'élément filaire (43) et tangent aux deux galets de pincement (25, 26) .6. Sleeve fitting machine according to one of claims 1 to 5, characterized in that the smooth double bevels (48, 49) of the upstream torpedoes (41) and downstream 42) are formed of inclined plane facets arranged symmetrically with respect to to a median plane passing through the wire element (43) and tangent to the two pinch rollers (25, 26).
7. Machine de pose de manchons selon la revendi¬ cation 6, caractérisée en ce que le double biseau lisse (48) de la torpille amont (41) est formé de deux facettes planes inclinées d'environ 30° et les deux galets de pincement (25, 26) passent tangentiellement sur ce double biseau lisse (48) , tandis que le double biseau (49) lisse de la torpille aval (42) est formé de deux facettes planes plus faiblement inclinées.7. sleeve-fitting machine according to revendi ¬ cation 6, characterized in that the pair of smooth chamfers (48) of the upstream torpedo (41) is formed by two plane facets sloping at about 30 ° and the two rollers pinch (25, 26) pass tangentially over this smooth double bevel (48), while the smooth double bevel (49) of the downstream torpedo (42) is formed by two planar facets which are more slightly inclined.
8. Machine de pose de manchons selon la revendi¬ cation 7, caractérisée en ce que le double biseau lisse (48) est défini par deux inserts rapportés (75) , de préférence interchangeables, dont les faces libres consti- tuent les facettes planes inclinées qui coopèrent avec les galets de pincement (25, 26) .8. Machine for fitting sleeves according to revendi ¬ cation 7, characterized in that the pair of smooth chamfers (48) is defined by two reported inserts (75), preferably interchangeable, having free faces Consti- kill inclined planar facets who cooperate with pinch rollers (25, 26).
9. Machine de pose de manchons selon l'une des revendications 1 à 8, caractérisée en ce qu'une encoche longitudinale (60.2) est prévue au fond de la gorge en V de chaque support de torpille (60) .9. Sleeve fitting machine according to one of claims 1 to 8, characterized in that a longitudinal notch (60.2) is provided at the bottom of the V-shaped groove of each torpedo support (60).
10. Machine de pose de manchons selon l'une des revendications 1 à 9, caractérisée en ce que le moyen de coupe (30) comporte une lame (31) portée par un bras tournant (32) d'axe horizontal, et ledit moyen est posi- tionné de façon que sa lame (31) rase le bord droit (51) de l'extrémité aval (47) de la torpille aval (42) .10. Sleeve fitting machine according to one of claims 1 to 9, characterized in that the cutting means (30) comprises a blade (31) carried by a rotating arm (32) with a horizontal axis, and said means is positioned so that its blade (31) shaves the straight edge (51) of the downstream end (47) of the downstream torpedo (42).
11. Machine de pose de manchons selon la revendication 10, caractérisée en ce que la lame de coupe (31) présente deux bords de coupe rectilignes (31.1, 31.2) se rejoignant au niveau d'une arête d'attaque (31.3).11. Sleeve fitting machine according to claim 10, characterized in that the cutting blade (31) has two straight cutting edges (31.1, 31.2) meeting at a leading edge (31.3).
12. Machine de pose de manchons selon la reven¬ dication il, caractérisée en ce que les deux bords de coupe12. Sleeve fitting machine according to reven ¬ dication it, characterized in that the two cutting edges
(31.1, 31.2) sont sensiblement perpendiculaires, et agencés de façon que l'arête d'attaque (31.3) contacte le sommet (20') de la gaine au voisinage d'un angle de pliage de celle-ci résultant du passage de ladite gaine sur la palette d'introduction (44) ou entre les deux galets de pincement (25, 26).(31.1, 31.2) are substantially perpendicular, and arranged so that the leading edge (31.3) contacts the top (20 ') of the sheath in the vicinity of a bending angle of the latter resulting from the passage of said sheath on the insertion pallet (44) or between the two pinch rollers (25, 26).
13. Machine de pose de manchons selon l'une des revendications 1 à 12, caractérisée en ce que les deux galets de pincement (25, 26) sont revêtus d'un élastomère sur leur périphérie, et sont en contact l'un avec l'autre de part et d'autre de leur gorge périphérique (65, 66) qui est de forme trapézoïdale et présente deux facettes (68, 69) inclinées symétriquement par rapport à leur plan médian (P) , en formant un V d'environ 60° d'ouverture.13. Sleeve fitting machine according to one of claims 1 to 12, characterized in that the two pinch rollers (25, 26) are coated with an elastomer on their periphery, and are in contact with one another. 'on either side of their peripheral groove (65, 66) which is trapezoidal in shape and has two facets (68, 69) inclined symmetrically relative to their median plane (P), forming a V of approximately 60 ° opening.
14. Machine de pose de manchons selon la revendication 13 , caractérisée en ce que les deux galets de pincement (25, 26) sont chanfreines sur leurs arêtes d'extrémité (70, 71). 14. Sleeve fitting machine according to claim 13, characterized in that the two pinch rollers (25, 26) are chamfered on their end edges (70, 71).
15. Machine de pose de manchons selon l'une des revendications 1 à 14 , caractérisée en ce que les deux galets de pincement (25, 26) sont montés sur un bâti porteur (23) qui peut pivoter, de préférence autour d'un axe vertical (19), en vue de permettre un dégagement latéral d'ensemble du moyen d'entraînement (90) . 15. Sleeve fitting machine according to one of claims 1 to 14, characterized in that the two pinch rollers (25, 26) are mounted on a support frame (23) which can pivot, preferably around a vertical axis (19), in order to allow an overall lateral release of the drive means (90).
EP98958979A 1997-12-12 1998-12-08 Machine for setting heat-shrinkable sleeves on objects from a continuous sheath Expired - Lifetime EP1037800B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9715784A FR2772344B1 (en) 1997-12-12 1997-12-12 SLEEVE PLASTIC MACHINE FOR HEAT SHRINKAGE ON OBJECTS FROM CONTINUOUS FLAT WOUND CONTAINER
FR9715784 1997-12-12
PCT/FR1998/002656 WO1999030970A1 (en) 1997-12-12 1998-12-08 Machine for setting heat-shrinkable sleeves on objects from a continuous sheath

Publications (2)

Publication Number Publication Date
EP1037800A1 true EP1037800A1 (en) 2000-09-27
EP1037800B1 EP1037800B1 (en) 2002-02-13

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EP (1) EP1037800B1 (en)
AU (1) AU1492799A (en)
CA (1) CA2314090A1 (en)
DE (1) DE69803880T2 (en)
ES (1) ES2172249T3 (en)
FR (1) FR2772344B1 (en)
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FR2772344B1 (en) 2000-02-04
DE69803880D1 (en) 2002-03-21
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AU1492799A (en) 1999-07-05
EP1037800B1 (en) 2002-02-13
FR2772344A1 (en) 1999-06-18
ES2172249T3 (en) 2002-09-16
CA2314090A1 (en) 1999-06-24
US6523331B1 (en) 2003-02-25

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