Method and apparatus for applying a stretch sleeve around objects of different diameters

Abstract

The process comprises the following steps: - equipping a former (8) with movable arms (9) with a stretchable sleeve (2) to be placed around an object; - adjusting the gap section of the former (8) to an entry section of the object; - bringing the movable arms (9) of the former into contact with the entry section of the object; - bringing the stretchable sleeve (2) into contact with the gap section of the former; - blowing pressurized air to create a localized air cushion at the entry section of the object, between the stretchable sleeve (2) and the object (3); - gripping the stretchable sleeve (2) in its part located at the level of the air cushion; - and exerting a tensile force on the sleeve (2) to seal the sleeve.

Description

Technical Field

[0001] The present invention relates to the technical field of applying stretchable labeling sleeves to objects of generally cylindrical shape, such as bottles, cans or drums, for example. Previous technique

[0002] The prior art has proposed numerous solutions for applying stretchable sleeves around objects. For example, French patent FR 2 723 913 discloses a method and a machine comprising a pair of stretchers designed to be inserted inside the sleeve. These stretchers have a network of channels connected to a pressurized air blowing means, opening onto the surface of the stretchers in contact with the sleeve to ensure even stretching of the sleeve around its entire circumference. These stretchers also have a network of channels connected to a suction means, opening onto the surface of the stretchers in contact with the sleeve. These channels are depressurized to draw in the inner wall of the sleeve, which thus remains firmly attached to the outer wall of the stretchers during their downward movement.The application method described in this patent involves stretching the sleeve transversely and sliding it onto a bottle in its stretched state. This sleeving technique leads to damage to the sleeve. Furthermore, the machine has a relatively complex design and cannot easily adapt to objects of different diameters.

[0003] French patent FR 2 631 924 describes a method and installation adapted for sleeving packages of different sizes using stretchable sleeves. This installation includes an application head with fingers arranged in a circle, extending parallel to each other by a length at least equal to the height of the sleeves. The installation also includes means for simultaneously moving the fingers along radial trajectories to adapt to the size of the sleeves being stretched around the fingers. While the technique disclosed by this patent allows adaptation to objects of different diameters, the proposed solution results in the sleeve being stretched along its entire height, which could compromise the quality of the sleeve application. Furthermore, this solution is relatively complex and costly to implement.

[0004] US Patent 10,793,310 B2 discloses a method for applying a stretch sleeve around an object, using a former with movable arms whose free ends define an adjustable gap section for the stretch sleeve, the method comprising the following steps: equipping the former with a stretch sleeve; adjusting the gap section of the former to an entry section of the object corresponding to the part of the object from which the stretch sleeve is sleeved; bringing the free ends of the movable arms of the former into contact with the entry section of the object; bringing the stretch sleeve into contact with the gap section of the former; and blowing pressurized air at the free ends of the arms of the former to create a localized air cushion at the entry section of the object, between the stretch sleeve and the object.ensure the gripping of the stretch sleeve in its part located at the level of the air cushion; and exert a pulling force on the stretch sleeve to translate it until the stretch sleeve is fitted around the object.

[0005] Document JP H11 227730 A discloses an installation for placing a stretchable sleeve around an object, comprising: a fixed support delimiting a placement plane for the object; a former supported by the fixed support to be positioned above the placement plane, the former comprising movable arms distributed angularly according to the circumference of a slide guided in vertical sliding on a guide system, the movable arms being mounted articulated so that the movement of the slide in one direction causes the movable arms to be deployed while the movement of the slide in the opposite direction causes the movable arms to be folded, the free ends of the movable arms delimiting an adjustable spacing section for the stretchable sleeve, between a minimum spacing section and a maximum spacing section; a compressed air blowing circuit comprising conduits opening at the free ends of the movable arms of the former. Description of the invention

[0006] The present invention aims to remedy the drawbacks of the prior art by proposing a new method for placing a stretchable sleeve around objects with different diameters while avoiding damage to the sleeve by excessive stretching force.

[0007] To achieve this objective, the object of the invention proposes a method for placing a stretchable sleeve around an object, using a former with movable arms whose free ends define an adjustable spacing section for the stretchable sleeve, the method comprising the following steps: equip the former with a stretchable sleeve; adjust the former's gap section to an object entry section corresponding to the part of the object from which the stretchable sleeve is sleeved; bring the free ends of the former's movable arms into contact with the object's entry section; bring the stretchable sleeve into contact with the former's gap section; blow pressurized air at the free ends of the former's arms to create a localized air cushion at the object's entry section, between the stretchable sleeve and the object; grip the stretchable sleeve in its part located at the air cushion; and exert a pulling force on the stretchable sleeve to translate it until the stretchable sleeve is sleeved around the object.

[0008] Advantageously, after the sleeving operation, the free ends of the former's moving arms are released from the object to ensure the removal of the sleeved object and the placement of a new object to be sleeved.

[0009] Typically, the former's gapping section is set by unfolding the movable arms between a minimum gapping section and a maximum gapping section.

[0010] According to an advantageous variant, a calibration phase is carried out for an object format comprising the following steps: to provide a conformer comprising movable arms distributed angularly around the circumference of a slider guided in vertical sliding on a guide system, the movable arms being mounted articulated so that the movement of the slider in one direction causes the movable arms to be deployed while the movement of the slider in the opposite direction causes the movable arms to be folded back, to move the slider to adjust the gap section of the conformer to the entry section of the object; to move the guide system of the slider so as to bring the free ends of the mobile arms of the conformer into contact with the entry section of the object while the gap section of the conformer corresponds to the entry section of the object; and to lock the guide system of the slider in position.

[0011] Preferably, after the adjustment phase, for each object to be sleeved of the same size: A stretch sleeve is threaded onto the former; an object to be sleeved is positioned; the slider is moved to bring the free ends of the former's movable arms into contact with the object's entry section, while the former's gap section corresponds to the object's entry section; the stretch sleeve is moved to the object's entry section; pressurized air is blown at the free ends of the former's movable arms to create the localized air cushion; a tensile force is applied to the stretch sleeve in its part located at the air cushion to translate it until the stretch sleeve is wrapped around the object; the slider is moved to ensure the retraction of the movable arms; the sleeved object is removed; and a new stretch sleeve is threaded onto the former.

[0012] Typically, pressurized air is blown towards the extension of the free ends of the former's moving arms to create the air cushion.

[0013] Another object of the invention is to provide an installation for placing a stretchable sleeve around objects of different diameters, with limited tooling while keeping the stretchable sleeve intact.

[0014] To achieve this objective, the object of the invention proposes an installation for placing a stretchable sleeve around an object, comprising: a fixed support defining a positioning plane for the object; a former supported by the fixed support to be positioned above the positioning plane, the former comprising movable arms distributed angularly around the circumference of a slide guided in vertical sliding on a guide system, the movable arms being mounted articulated so that the movement of the slide in one direction causes the movable arms to be deployed while the movement of the slide in the opposite direction causes the movable arms to be folded back, the free ends of the movable arms defining an adjustable spacing section for the stretchable sleeve, between a minimum spacing section and a maximum spacing section; a compressed air blowing circuit comprising conduits opening at the free ends of the movable arms of the former.

[0015] Advantageously, the mobile arms are activated via a spreading system configured to ensure the deployment and retraction of the mobile arms.

[0016] Advantageously, the slide guide system is mounted on the fixed support using a removable fixing system allowing adjustment of the former's position relative to the object's placement plane.

[0017] For example, the compressed air blowing circuit includes a series of conduits, each extending along the movable arms to open at the free end of the movable arms by a first end, these conduits having, opposite the first ends, second ends communicating with a distribution manifold connected to a compressed air supply conduit. Brief description of the drawings

[0018] [ Fig. 1 ] There figure 1 is a simplified general perspective of an example of an installation according to the invention for placing a stretchable sleeve around an object. Fig. 2 ] There figure 2 is a larger-scale perspective of an example of an embodiment of the conformer implemented in the installation according to the invention. Fig. 3 ] There figure 3 is a schematic elevation diagram of an example embodiment of the former implemented in the installation according to the invention. Fig. 4 ] There figure 4 is a profile view illustrating the installation in the waiting position for sleeved an object. Fig. 5 ] There figure 5 is a profile view illustrating the positioning of the conformer adapted to the size of the object to be sleeved. Fig. 6 ] There figure 6 is a side view illustrating the creation of an air cushion at the free ends of the former's arms when a sleeve is fitted onto the former. Fig. 7 ] There figure 7 is a profile view of a detail of the former illustrating the blowing of pressurized air at the free ends of the former's arms to create a localized air cushion. Fig. 8 ] There figure 8 is a side view illustrating the installation after a sleeve has been fitted onto the former. Description of the implementation methods

[0019] The invention relates to an installation 1 for placing a stretchable labeling sleeve 2 around an object 3 of any kind, such as, for example, a cylindrical container like a can, bottle, or drum. Conventionally, the elastic property of the sleeve 2 is used so that the sleeve 2 can be stretched around the object 3. Each object 3 thus has an entry section 3s corresponding to the part of the object from which the sleeve is placed around it.

[0020] The installation 1 includes a fixed support or frame 5 fitted to present a tray or receiving table 6 for an object 3. The tray or receiving table 6 is adapted to delimit a placement plane 6a for the object 3, configured to allow the object to be held in position during the operation of placing the sleeve around the object.

[0021] The installation 1 also includes a former 8 supported by the fixed support 5 for positioning above the mounting surface 6a. The former 8 has movable arms 9 distributed angularly around the circumference of a slide 11 guided vertically on a guide system 12. In the illustrated example, the slide 11 is in the form of a ring mounted to slide on a rod 12a, which is part of the guide system 12 and extends along the vertical axis X. As will be described in more detail later, movement of the slide 11 in one direction causes the movable arms 9 to extend, while movement of the slide 11 in the opposite direction causes the movable arms 9 to retract.

[0022] The movable arms 9 are, for example, each formed by an elongated, rectangular, flat element, having a first end 9a mounted by a pivot joint along a horizontal axis 13. The axes 13 of the movable arms 9 are distributed along a cross-section of the slider that is perpendicular to the vertical axis X, so that the movable arms cause the former to open and close like an umbrella. For example, each axis 13 is supported by a branch 11a extending radially from the slider 11. It should be noted that a portion of the slider 11 extends above the axes 13 so as to provide a gripping area for the slider.

[0023] Each movable arm 9 has a second end 9b, called the free end, opposite the first end 9a. The movable arms 9 are all the same length, so that the free ends 9b of the movable arms 9 are all located in a section perpendicular to the vertical axis X. A stretchable sleeve 2 is intended to be placed around the former 8 so that the free ends 9b of the movable arms come into contact with the inner face of the stretchable sleeve to stretch it. The free ends 9b of the movable arms thus define, together, an adjustable gap section for the stretchable sleeve, between a minimum gap section and a maximum gap section, depending on the degree of pivoting of the movable arms 9. In the illustrated example, there are eight movable arms 9, but of course the former can have a different number of movable arms.Generally, the number of movable arms 9 is chosen according to the size and more or less complex shape of the object 2 to be sleeved. There is no inherent limit to the number of movable arms 9 that can be used to perform this spacing function. A minimum of two movable arms can be considered if their shape is suitable for the object 3. In the illustrated example, the movable arms 9 are flat, but it is possible to design the movable arms 9 with a curved shape to adapt to the cylindrical shape of the object 3.

[0024] According to an advantageous embodiment, the movable arms 9 are acted upon via a spacing system 15 configured to ensure the deployment and retraction of the movable arms 9. In the embodiment illustrated in the drawings, the movable arms 9 are articulated on the guide system 12 by means of the spacing system 15 comprising connecting rods 15a in a number equal to the number of movable arms 9. As will be more precisely shown in the figure 3 , the ends of each connecting rod 15a are mounted in pivot joint along a horizontal axis 15b on one side with a movable arm 9 and on the other side, with a branch 12b extending radially from the free end of the rod 12a.

[0025] In the illustrated example, the movable arms 9 are hinged to the slide 11 and the guide system 12 such that the movement of the slide ensures the extension and retraction of the movable arms. Thus, the downward sliding of the slide 11 causes the movable arms 9 to extend, while the upward movement of the slide 11 causes the movable arms 9 to retract. In one embodiment, the slide 11 is moved manually. In another embodiment, the slide 11 is moved using a linear actuator. Similarly, in the illustrated example, the movable arms 9 are moved using the connecting rod spreader system 15a, but it is clear that the movable arms can be moved differently, for example, using a rack and pinion system.

[0026] According to an advantageous embodiment, the guide system 12 of the slider 11 is mounted on the fixed support 5 by means of a removable fastening system 17, allowing adjustment of the position of the former 8 relative to the positioning plane 6a of the object 3. In the illustrated example, the removable fastening system 17 includes a clamping screw 17a that cooperates with the rod 12a, which slides in a passage 5c formed in a bracket 5d of the fixed support 5. Of course, the removable fastening system 17 can be implemented differently. For example, the rod 12a is equipped with a handle 12p to facilitate the vertical movement of the former 8.

[0027] According to another feature of the invention, the installation 1 also includes a compressed or pressurized air blowing circuit 20 comprising conduits 20a opening at the free ends 9b of the movable arms 9 of the former 8. This blowing circuit 20 is configured to create an air cushion 22 located at the entry section of the object 3, between the stretchable sleeve 2 and the object 3, to enable the sleeve operation to be carried out.

[0028] According to an advantageous embodiment, the air supply circuit 20 comprises a series of ducts 20a, each extending along a movable arm and opening at the free end 9b of the movable arms via a first end 20b. As is more precisely apparent from the figures 6 And 7These conduits 20a are mounted on the inner face of each of the movable arms 9 and extend along the arms to their free end 9b. More precisely, since the free end 9b of the movable arms is in contact with the object 2, these conduits 20a are slightly recessed from the free end 9b of the movable arms 9, for example by a few millimeters. Preferably, all the movable arms 9 are equipped with conduits 20a for conveying pressurized air.

[0029] Advantageously, the first ends 20b of the ducts 20a are configured to blow air towards the point of contact between the movable arms 9 and the object 2, i.e. in line with the free ends of the movable arms 9 to create the air cushion between the stretchable sleeve 2 and the object 3. The first ends 20b of the ducts 20a can thus be directed outwards from the former 8 or be fitted with outlet nozzles directing the flow outwards from the former.

[0030] The conduits 20a have, opposite the first ends 20b, second ends 20c communicating with a distribution manifold (not shown), connected to a pressurized air supply conduit 20d. Thus, all the conduits 20a are supplied with pressurized air during the sleeving operation to create an air cushion 22 to aid the sleeving.

[0031] The installation 1 described above enables the implementation of a sleeving process that follows directly from the above description. The process according to the invention aims to place a stretchable sleeve 8 around an object 3, using a former with movable arms 9 whose free ends 9b define an adjustable gap section for the stretchable sleeve. The process according to the invention comprises the following steps: equip the conformer 8 with a stretchable sleeve 2; adjust the gap section of the conformer 8 to an entry section 3s of the object 3 corresponding to the part of the object from which the stretchable sleeve is sleeved; bring the free ends 9b of the mobile arms 9 of the conformer into contact with the entry section 3s of the object; bring the stretchable sleeve 2 into contact with the gap section of the conformer; blow pressurized air at the free ends 9b of the mobile arms 9 of the conformer to create a localized air cushion at the entry section of the object, between the stretchable sleeve 2 and the object 3; grip the stretchable sleeve 2 in its part located at the air cushion; and exert a tensile force on the stretchable sleeve to translate it until the stretchable sleeve 2 is sleeved around the object 3.

[0032] The process described above allows the application of stretch sleeves 2 using a former 8 of adjustable size for various types of objects 3, without multiplying the number of tools and without excessively stretching the sleeve 2. The pressurized air sent by the former 8 allows the stretch sleeve 2 to be locally deformed, facilitating its gripping and movement when it is applied around the object.

[0033] According to one feature of the invention, the gapping section of the former 8 is adjusted by unfolding the movable arms 9 between a minimum gapping section shown in the figure 4 and a maximum gapping section. Typically, the gapping section of the former 8 can vary between 80 cm and 170 cm. In other words, the former 8 can place stretchable sleeves around cylindrical objects with diameters greater than 80 cm and less than 170 cm, for example, knowing that these diameters can change depending on the elasticity of the material chosen for the stretchable sleeve 2.

[0034] According to an advantageous feature, the method according to the invention aims to implement a calibration phase for the conformer 8 for a given object format 3. Thus, once this calibration phase has been completed, the conformer 8 can be used successively for all objects 3 having the same format. This calibration phase comprises the following steps: providing a conformer 8 having movable arms 9 distributed angularly around the circumference of a slide 11 guided vertically on a guide system 12, the movable arms 9 being mounted articulated so that the movement of the slide 11 in one direction causes the movable arms 9 to deploy while the movement of the slide in the opposite direction causes the movable arms 9 to retract; moving the slide 11 to adjust the gap section of the conformer to the entry section 3s of the object; moving the guide system 12 of the slide so as to bring the free ends 9b of the movable arms of the conformer into contact with the entry section of the object while the gap section of the conformer corresponds to the entry section of the object; and locking the guide system 12 of the slide in position.

[0035] At the beginning of this adjustment phase, an object 3 to be sleeved is positioned on the positioning plane 6a to be located below the conformer 8 ( figure 4 ). Object 3 is positioned so that its entry section 3s, corresponding to the part of the object from which the sleeve is sleeved, is positioned upwards towards the conformer 8. In this position, the movable arms 9 are folded, i.e., they extend substantially parallel to the vertical axis X ( figure 4 ). For the adjustment phase, the movable arms 9 are deployed so that the free ends 9b of the movable arms 9 define a gap section corresponding to the entry section 3s of the object 3. For this purpose, the slider 11 is moved in translation to ensure the opening of the movable arms 9. In addition, the former 8 is moved vertically relative to the object, via the guide system 12 of the slider, so that the free ends 9b of the movable arms 9 come to rest on the object 3 ( figure 5 To this end, screw 17a of the removable fastening system 17 is loosened to allow the conformer 8 to descend. When the movable arms 9 are resting on the object 3, screw 17a is tightened to lock the rod 12a, which supports the conformer 8, in position. In this position, the free ends 9b of the movable arms 9 are flush with the outer diameter of the object 3. It should be noted that in this position, the downward movement of the slider 11 is limited by the presence of the object 3 under the movable arms 9. Once the adjustment is made, the slider 11 can be moved upwards to release the object 3.

[0036] After this adjustment phase, each object 3 of the same format is sleeved by implementing the following steps: a stretchable sleeve 2 is threaded onto the former 8; an object to be sleeved 3 is positioned on the positioning plane 6a; the slider 11 is moved to bring the free ends 9a of the movable arms 9 of the former 8 into contact with the entry section of the object 3.In this position of support of the movable arms 9 on the object 3, it should be noted that the spreading section of the conformer 8 corresponds to the entry section of the object following the adjustment phase; the stretchable sleeve 2 is moved to the entry section 3s of the object 3; pressurized air is blown at the free ends 9b of the conformer arms to create a localized air cushion 22; a tensile force is applied to the stretchable sleeve 2 in its part located at the level of the air cushion to translate it until the stretchable sleeve is sleeved around the object; at the end of the sleeving operation, the pressurized air is preferably cut off; the slider 11 is moved to ensure the folding of the movable arms 9; the sleeved object 3 is removed; and a new stretchable sleeve 2 is threaded onto the conformer 8 for its placement on a new object.

[0037] Thus, when the conformer 8 is in its folded position ( figure 4 ), a stretchable sleeve 2 can be threaded around the former 8. After positioning an object to be sleeved 3 on the positioning plane 6a, the slider 11 is moved to bring the free ends 9a of the movable arms 9 of the former 8 into contact with the entry section of the object 3 ( figure 5 ). The movement of the slider 11 leads to the deployment of the movable arms 9, the spacing of which corresponds to the entry section of the object. The positioning of the movable arms 9 is automatic and results from the adjustment phase. The stretchable sleeve 2 is moved to the entry section 3s of the object 3, and pressurized air is blown at the free ends 9b of the movable arms to create a localized air cushion 22 ( figures 6 And 7). Air is blown towards the point of contact between the object and the movable arms, extending from the free ends 9b of the movable arms. This air cushion 22 allows the sleeve to be stretched to facilitate its placement. A tensile force represented by arrow F at the figure 7 is applied to the stretchable sleeve 2 in its part located at the level of the air cushion. This tensile force is applied to the sleeve to translate it until it completely covers the object.

[0038] Once the sleeve is fitted, the pressurized air is shut off. The slide 11 is raised, which causes the movable arms 9 to fold back as illustrated in the figure 8 The former 8, and in particular the free ends of the movable arms 9, are thus freed from the sleeved object 3, which can then be removed. A new stretchable sleeve 2 can be slipped onto the former 8 for application to a new object.

Claims

1. A method for placing a stretchable sleeve (2) around an object (3), using a shaper (8) with movable arms (9) delimiting, by their free ends (9b), an adjustable spacing section for the stretchable sleeve, the method including the following steps: - equipping the shaper (8) with a stretchable sleeve (2); - adjusting the spacer section of the shaper (8) to an entry section of the object corresponding to the part of the object from which the stretchable sleeve is sleeved; - bringing the free ends (9b) of the movable arms (9) of the shaper into contact with the entry section of the object; - bringing the stretchable sleeve (2) into contact with the spacer section of the shaper; - blowing pressurized air at the free ends (9b) of the arms of the shaper (8) to create a localized air cushion at the entry section of the object, between the stretchable sleeve (2) and the object (3); - ensuring the gripping of the stretchable sleeve (2) in its part located at the air cushion; - and exerting a tensile force on the stretchable sleeve (2) to translate it until the stretchable sleeve is stretched around the object.

2. The method according to claim 1, wherein after the sleeving operation, the free ends (9b) of the movable arms of the shaper (8) are released from the object (3) to ensure the removal of the sleeved object and the placement of a new object to be sleeved.

3. The method according to one of the preceding claims, wherein the spacing section of the shaper (8) is adjusted by unfolding the movable arms (9) between a minimum spacing section and a maximum spacing section.

4. The method according to one of the preceding claims, wherein an adjustment phase is carried out for an object format (3) including the following steps: - providing a shaper (8) including movable arms (9) distributed angularly along the circumference of a slide (11) guided in vertical sliding on a guide system (12), the movable arms (9) being mounted articulated so that the movement of the slide (11) in one direction causes the movable arms to deploy while the movement of the slide, in the opposite direction, causes the movable arms to fold back; - moving the slide (11) to adjust the spacing section of the shaper (8) to the entry section of the object; - moving the guide system (12) of the slide in order to bring the free ends (9b) of the movable arms (9) of the shaper into contact with the entry section of the object while the spacing section of the shaper corresponds to the entry section of the object; - and locking the guide system (12) of the slide (11) in position.

5. The method according to the preceding claim, wherein after the adjustment phase, for each object (3) to be sleeved of the same format: - a stretchable sleeve (2) is slipped onto the shaper (8); - an object (3) to be sleeved is positioned; - the slide (11) is moved in order to bring the free ends (9b) of the movable arms of the shaper (8) into contact with the entry section of the object while the spacing section of the shaper corresponds to the entry section of the object; - the stretchable sleeve (2) is moved to the entry section of the object (3); - pressurized air is blown at the free ends (9b) of the movable arms (9) of the shaper to create the localized air cushion (22); - a tensile force is applied to the stretchable sleeve (2) in its part located at the air cushion to translate it until the stretchable sleeve is sleeved around the object; - the slide (11) is moved to ensure the folding of the movable arms (9); - the sleeved object is removed; - and a new stretchable sleeve (2) is slipped onto the shaper (8).

6. The method according to one of the preceding claims, wherein the pressurized air is blown toward the extension of the free ends (9b) of the movable arms of the shaper (8) to create the air cushion.

7. An installation for placing, around an object (3), a stretchable sleeve (2), comprising: - a fixed support (5) delimiting a laying plane (6a) for the object; - a shaper (8) supported by the fixed support (5) to be positioned above the laying plane, the shaper (8) comprising movable arms (9) distributed angularly according to the circumference of a slide (11) guided in vertical sliding on a guide system (12), the movable arms (9) being mounted articulated so that the movement of the slide (11) in one direction causes the movable arms (9) to deploy while the movement of the slide in an opposite direction causes the movable arms (9) to fold, the free ends (9b) of the movable arms delimiting an adjustable spacing section for the stretchable sleeve (2), between a minimum spacing section and a maximum spacing section; - a compressed air blowing circuit (20) comprising conduits (20a) opening at the free ends (9b) of the movable arms (9) of the shaper.

8. The installation according to claim 7, wherein the movable arms (9) are acted upon by means of a spacing system (15) configured to ensure the deployment and folding of the movable arms (9).

9. The installation according to one of claims 7 or 8, wherein the guide system (12) of the slide (11) is mounted on the fixed support using a removable attachment system (17) making it possible to adjust the position of the shaper (8) with respect to the laying plane (6a) of the object.

10. The installation according to one of claims 7 to 9, wherein the compressed air blowing circuit (20) comprises a series of conduits (20a) each extending along the movable arms (9) to open at the free end (9b) of the movable arms by a first end, these conduits (20a) having, opposite the first ends, second ends communicating with a distribution manifold connected to a compressed air supply conduit (20).

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