EP2161200A1 - Device for setting sleeves on objects moving past - Google Patents

Abstract

The device (M) has a sheath-opening shaper (20) floatingly maintained between outer wheels (30, 31) and backing wheels (25, 26). Other outer wheels (32, 33) are provided downstream from a cutter unit (27) to eject cut-off sheath segments (15) onto an article (10) i.e. bottle. A superposed rotary ring (55) has a cam path parallel to a cutting plane and an oblique direction. A cam is rotationally integrated with a blade-carrier via a pin that is parallel to a common axis (X) of the ring and another superposed rotary ring (57) and pivotally mounted on the latter ring.

Description

The present invention relates to the laying of sleeves, in particular the installation of heat shrink sleeves, on moving objects, the coated objects of their sleeve then passing at a retraction furnace.

BACKGROUND OF THE INVENTION

For the installation of heat-shrink sleeves on moving objects, a technique is conventionally used in which the sleeves are cut from a continuous sheath passing over a sheath-opening shaper, which is kept floating by cooperation between outer rollers. and counter-rollers of parallel axes carried by the shaper, which outer rollers ensure the advance of the sheath along the shaper, generally vertical, to and beyond a cutting means. Other rollers are generally provided downstream of the cutting means for ejecting the section of sheath cut on the object coming directly above the shaper.

Thus, in most of the techniques used, there are first outer rollers intended to ensure the advance of the sheath on the shaper, and second outer rollers for ejecting the section of sheath cut on the object concerned. All these outer rollers are of course motorized, and their motorization has given rise to different types of arrangements.

It has thus been proposed to have a completely independent motorization for the second rollers and the first rollers, in order to be able to turn the second rollers much faster than the first, in order to precipitate the vertical fall of the section of sheath cut on the object concerned. This approach is illustrated in the document EP-A-0 109 105 . According to another approach, a synchronization of the rotational drive of the first and second rollers is provided, as illustrated in the document EP-A-0 000 851 .

However, we realized that the techniques The above mentioned limitations in terms of timing, because, when arriving at high speeds, it was found that sleeves were often poorly positioned on objects, especially if they were sleeves high height.

An important step has been taken more recently with a technique implementing a control of the relevant electric motors performed in synchronism by a common electronic programmer arranged to determine a continuous profile of variation of the speeds, in order to control the ejection of each section of sheath. , said programmer including at least one control card which cooperates with an adjacent encoder mounted at the end of a shaft driven in rotation by a central geared motor unit. This is illustrated in the document WO-A-99/59871 of the plaintiff. With the latter technique, the synchronization has allowed to consider higher rates than previously, and with a sleeve diameter barely greater than the maximum diameter of the objects.

There is, however, a growing demand for increasingly higher clock speeds, typically ranging from 300 to 600 strokes per minute.

It is then preferred to use more advanced machines by abandoning the system of stepwise advancement of the objects, as well as the encoder system mounted at the end of a shaft driven in rotation by a central geared motor unit (as described in the document WO-A-99/59871 mentioned above), and use a virtual electronic programmer with a virtual shaft for controlling all the electric motors, the ejection instruction of the cut sheath section being given by a cell in front of which the scrolling objects pass.

Parallel to this search for very high rates, there is also a tendency to use sheaths made from a heat shrinkable film of increasingly weaker thickness. As an indication, the conventional techniques used heat-shrinkable films whose thickness was of the order of 50 microns, whereas now it is sought to use heat-shrinkable plastic films of smaller thickness, that is to say up to 25 microns thick. μm, and also of lower density.

The aforementioned double requirement thus considerably complicates the arrangement of sleeving devices, and there is a type of technical problem which is increasingly acute, and which concerns the cutting process of the immobilized sheath. on the sheath opening shaper.

Indeed, the cutting means conventionally used implements at least one blade that rotates around the shaper at a deep groove thereof which is associated with a ligament joining the two constituent parts of the shaper, the alternating pivoting of the or each blade between its retracted position and its cutting position being provided by means of a circumferential type cam system in which a roller associated with the or each blade circulates in a cam track defined by 360 ° by coaxial tracks of a fixed ring. However, it has been found that such an arrangement becomes impassable at very high speeds, and that the rapid wear of the rollers was very difficult to control. Such an arrangement has been illustrated by way of example. figure 2 .

In addition, during the cutting process, the cutting edge of the blade attacks the wall of the sheath at the aforementioned groove of the shaper, exerting a large thrust force to pass through the wall of the sheath. Now it has been found that this radial force has the effect of pushing the cutting lips in the aforementioned groove, which causes a cutting edge which is not perfectly straight but has irregularities, and also generates an inherent risk deformations of depression experienced by the sheath that can only disturb the normal process of sheath advance and ejection of the cut section. This negative thrust effect of the sheath wall during cutting becomes even more acute when sleeves made from a heat-shrinkable film of small thickness and low density are used.

The state of the art relating more specifically to the continuous sheath cutting systems that equip the sleeves laying machines on moving objects, is also illustrated in the documents mentioned below.

The document US-A-5,566,527 illustrates a cutter blade cutting system mounted on a turntable, with a purely radial attack of the wall of the sheath to be cut.

The document DE-A-297 16,624 illustrates a coplanar multiple blade cutting system that is individually actuated by pneumatic means. Again, the attack of the wall of the sheath by each blade is effected by exerting a thrust force to cross said wall.

The WO-2008/076718 finally describes two different cutting systems, one with a turntable assembly, and the other with a superimposed ring system whose rotation difference acts on a maneuvering finger of each pivoting blade, with an attack of the wall the sheath which is for each purely radial blade, where it results in a large thrust force exerted on said wall. We find a similar arrangement to the aforementioned system, with the same disadvantages, in the document EP-A-1797984 .

OBJECT OF THE INVENTION

The object of the invention is to design a device for laying sleeves on moving objects that do not have the aforementioned drawbacks and limitations with regard to the technical problem set out above, in connection with the process of cutting the sheath immobilized on the shaper opening shaper.

The object of the invention is also to propose a sleeve laying device arranged to allow very high clocking, which can reach 600 shots per minute, even using continuous sheaths made from thin films, for example able to down to 25 microns, and low density, especially of density less than 1.

GENERAL DEFINITION OF THE INVENTION

The aforementioned problem is solved according to the invention by means of a device for laying sleeves on moving objects, said sleeves being cut from a continuous sheath passing over a sheath opening shaper having a central axis, which shaper is maintained floating between first outer rollers and counter rollers of parallel axes carried by said shaper, to and beyond a cutting means, second outer rollers being provided downstream of the cutting means for eject the section of sheath cut on an object coming directly above the shaper as a result of the passage of said object in front of a cell, the cutting means comprising at least one blade mounted on a support which is arranged to turn around the shaper, the or each blade being pivotable on said rotating support while remaining in a plane substantially perpendicular to the axis of the shaper, facing a groove of said shaper, alter nally between a withdrawal position and a cutting position in which it partially penetrates into said shaper groove, said device being remarkable in that the alternating pivoting of the or each blade between its retracted position and its cutting position is provided by means of a cam system by the difference of rotation of two superimposed rotating crowns constituting the support of said blade, one of which has a cam path parallel to the oblique cutting plane and direction, in which slides a cam who is integral in rotation with a blade holder via an axis parallel to the common axis of the rings and journalled on the other ring, and in that the or each blade has a free end which is arranged to piercing the wall of the sheath and cutting said wall while exerting thereon a force (F) directed radially outwardly.

For this purpose, it is provided that the or each blade is arranged so that its end intersects the wall of the sheath while maintaining an orientation such that the tangent to the cutting edge forms with the tangent to the sheath wall, in the direction rotation of the support of said blade, an angle (α) less than 90 °. In particular, the angle (α) between the two tangents is chosen to be close to 75 °.

Thus, the abovementioned characteristics make it possible to guarantee that the wall of the sheath is first pierced, then cut off by being pulled radially outwards, without the risk that the cutting lips are pushed towards the axis of the shaper, and this same at the highest rates and with very thin sheath walls.

According to a particular embodiment, the free end of the or each blade is shaped hook beak. Advantageously then, the hooked free end of the or each blade has a concave arc-shaped cutting edge extending to a tip of said blade whose other edge is convex arc-shaped. .

According to another particular embodiment, the free end of the or each section has a cutting edge which is rectilinear and whose direction defines the tangent to the cutting edge.

More preferably, the or each blade is fixed on its blade holder by an individual quick-release fastening means. In particular, the individual quick-release fastening means comprises a sliding bar arranged to pass over the blade in order to maintain it, or to release said blade in order to allow removal.

It is also advantageous to provide that the support carries a plurality of blades angularly distributed and arranged to pivot in a common plane.

Advantageously then, the cam system is arranged so that the blades rotate in synchronism in the same movement between their retracted position and their cutting position.

In this case it is advantageous to provide that the alternating pivoting of the blades is adjusted so that the distance of penetration of the free end thereof into the groove of the shaper is just sufficient to ensure the passage of the wall of the sheath, in particular about 2 to 3 mm.

Other features and advantages of the invention will emerge more clearly in the light of the following description and the accompanying drawings, relating to a particular embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS

• la figure 1 illustre un dispositif de pose de manchons conforme à l'invention, avec une représentation symbolique des différents moyens d'entraînement en rotation des galets coopérant avec la gaine passant sur le conformateur, ici d'axe vertical, et avec le tronçon de gaine coupé ;
• la figure 2 est une vue de dessous illustrant les moyens de coupe et leur support tournant, avec un pivotement alterné assuré par un système de cames de type circonférentiel, conformément à l'art antérieur, respectivement en a) en position de retrait des lames de coupe, en b) en position de perçage de la paroi de gaine, et en c) en position de coupe de ladite paroi ;
• la figure 3, avec son détail IV représenté à plus grande échelle en figure 4, est une vue analogue à celle de la figure 2 pour un agencement de moyens de coupe similaires, mais équipant un dispositif de pose de manchons du type de celui de l'invention, avec un pivotement alterné qui est assuré par un système de cames associé à deux couronnes tournantes superposées ;
• la figure 5, avec son détail VI représenté à plus grande échelle en figure 6, illustre un dispositif de pose conforme à l'invention, dans lequel l'agencement de la lame (ici à extrémité libre conformée en bec crochu) est particulier, et procure un effet de tirage vers l'extérieur sur la paroi de gaine lors de la coupe, grâce justement à l'extrémité libre conformée en bec crochu ;
• la figure 7, avec son détail VIII représenté à plus grande échelle en figure 8, illustre une variante procurant le même effet de tirage que précédemment, mais avec une lame à bord de coupe rectiligne ;
• la figure 9 est une vue en perspective éclatée de la couronne supérieure du support du moyen de coupe, montrant mieux le mécanisme de came associée ;
• la figure 10 est une vue en perspective d'une lame de coupe à l'extrémité libre en bec crochu, avec son porte-lame et son moyen individuel de fixation à démontage rapide ; et
• la figure 11 est une vue partielle, en coupe par un plan vertical, illustrant la pénétration de la lame de coupe dans la gorge du conformateur lors du processus de coupe.

Reference will be made to the figures of the accompanying drawings, in which:

• the figure 1 illustrates a sleeves installation device according to the invention, with a symbolic representation of the various means for rotating the rollers cooperating with the sheath passing over the shaper, here vertical axis, and with the section of sheath cut;
• the figure 2 is a bottom view illustrating the cutting means and their rotating support, with an alternating pivoting provided by a cam system of circumferential type, according to the prior art, respectively a) in the position of withdrawal of the cutting blades, in b) in the drilling position of the sheath wall, and in c) in the cutting position of said wall;
• the figure 3 , with its detail IV represented on a larger scale in figure 4 , is a view similar to that of the figure 2 for an arrangement of similar cutting means, but equipping a sleeve laying device of the type of that of the invention, with an alternating pivoting which is provided by a cam system associated with two superimposed rotating crowns;
• the figure 5 , with its detail VI represented on a larger scale in figure 6 , illustrates a laying device according to the invention, in which the arrangement of the blade (here free-hooked end shaped) is particular, and provides an effect of pulling outwardly on the sheath wall during the cut, thanks precisely to the free end shaped as a hooked beak;
• the figure 7 , with its detail VIII represented on a larger scale in figure 8 , illustrates a variant providing the same pulling effect as before, but with a straight-edged cutting edge blade;
• the figure 9 is an exploded perspective view of the upper crown of the support of the cutting means, showing better the associated cam mechanism;
• the figure 10 is a perspective view of a cutting blade at the free end in hooked beak, with its blade holder and its individual means of fixing to quick disassembly; and
• the figure 11 is a partial view, in section through a vertical plane, illustrating the penetration of the cutting blade into the groove of the shaper during the cutting process.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

On the figure 1 , there is a laying machine denoted M, for laying sleeves on moving objects, arranged in accordance with the invention.

The laying machine M has a number of points in common with the laying machine described in the document WO-A-99/59871 above mentioned by the plaintiff. These common elements will therefore be described briefly, but reference may be made to the aforementioned document for further details. details.

Objects 10, represented here in the form of flasks, run on a conveyor belt 11 in a direction denoted 100, said conveyor belt being driven in motion by associated means not shown here.

A flat sheath of heat-shrinkable plastics material 13 is fed from a spool 14 rotatably mounted on a frame portion 16, said sheath passing over return rollers 17 and 18 to arrive over an opening shaper sheath 20. The sheath opening shaper 20, which is here vertical axis X, comprises an upstream central portion 21 surmounted by a flat portion 22, so as to gradually open the continuous sheath 13 arriving on said shaper. The sheath opening shaper 20 further comprises a downstream portion 23, which extends the upstream central portion 21, the separation being made at a groove 24.

A cutting means 27 with at least one movable blade 28 is carried by a rotating support 29 arranged at the groove 24 to cut the sheath according to a given control instruction, the cut being circularly in a plane P perpendicular to the X axis of the shaper, that is to say in this case essentially horizontal.

The shaper 20 is of floating type, being held by cooperation between first outer rollers 30, 31 and counter rollers 25, 26 of parallel axes carried by said shaper.

The continuous sheath 13 thus opens progressively on the upstream portion 21 of the shaper 20, and passes between the roller 30 and the counter rollers 25, and between the roller 31 and the counter rollers 26, respectively, the rollers 30, 31 thus ensuring both a floating support function of the shaper 20 and, by their motorization, a function of advance of the continuous sheath 13 along said shaper.

Second outer rollers 32, 33 are provided downstream of the cutting means 27 for ejecting the section of cut sheath, noted 15, on an object 10 coming directly above the shaper 20, as a result of the passage of said object in front of a cell 80 .

There is shown schematically an electric motor 41 for driving the pair of rollers 30, 31 of sheath feed, and two electric motors 42, 43 for driving the rollers 32, 33 for ejection of the clipped section of sheath.

The cutting means 27 is carried by a rotating support 29 which consists of two superimposed rings 55, 57 driven in rotation, and whose rotation speed difference ensures, by means of a particular cam system which will be described next. in more detail, the alternating pivoting of the cutting blade or blades 28 between a retracted position and a cutting position. The driving of these two superimposed rings 55, 57 is ensured, by means of belts 56, 58, by two electric motors 48, 49.

The aforementioned electric motors 41, 42, 43, 48, 49 are connected, by associated lines 51, 52, 53, 54, 54 'respectively, by a common electronic programmer 50 with a virtual shaft. The cell 80 which sees each scrolling object 10, is connected by a line 81 to the common electronic programmer 50, in particular to transmit the signal authorizing the control of the motors 42, 43 associated with the ejection of the section of sheath cut on the object 10 coming in line with the shaper 20. The general synchronization is ensured by the common electronic virtual shaft programmer 50 which includes at least one electronic control card 55 with multiple commands which is connected to the control lines 51, 52, 53, 54, 54 'above.

The arrangement of the cutting means 27 for cutting the wall will now be described in more detail. of the sheath 13 at the groove 24 of the shaper 20, this cutting pass occurring just after stopping the advance of the sheath, and just before ejection of the sheath section cut 15.

To better understand the operating mode of the cutting means used in the sleeving device according to the invention, with the important advantages that derive therefrom, a conventional type arrangement will firstly be described with reference to FIG. figure 2 .

The cutting means 27 'then consists of a plurality (here four) of razor blades 28' arranged to pivot in a common plane which is the cutting plane. Each blade 28 'is mounted on a blade holder 62' provided with an axis 61 'which is journalled on a rotating ring 55', and the blades 28 'rotate in synchronism in a single movement between their retracted position and their cutting position.

The alternating pivoting of each blade 28 'between its retracted position and its cutting position is ensured by means of a cam system 59' of circumferential type in which a roller 59'.1 associated with the blade holder 62 'of each blade 28 'circulates in a cam track bounded by 360 ° by coaxial tracks 59'.2, 59'.3 of a fixed ring 57'. In a) the four blades 28 'are in the retracted position. In b) and c), the rotation in the direction 101 of the rotary ring 55 'drives the rollers 59.1, whose sliding in the circumferential cam path rotates said rollers and with them the associated blade holders 62'. As indicated above, such an arrangement is incompatible with very high speeds, and the wear of the rollers 59'.1 is fast and difficult to control.

The invention overcomes this limitation through an arrangement in which the alternating pivoting of the or each blade 28 between its retracted position and its cutting position is provided by means of a cam system. 29 by the difference in rotation of two superimposed rotating rings 55, 57 constituting the support of said blade, one of which (here the upper ring 55) has a straight cam path 60 parallel to the section plane P and oblique direction, in which slides an elongated cam 59.1 which is integral in rotation with the blade holder 62 via an axis 61 which is parallel to the common axis X of the rings 55, 57 and journalled on the other rotary ring 57.

The support of the cutting means 29 thus consists of two superimposed rotary rings 55, 57 driven in rotation about the X axis (arrow 101), the alternating phase shift between these two rings generating the movement of the blade holders 62 thanks to the cam system 59 connected to the axis 61, which axis is coupled to an associated sliding cam 29.1 passing in a cam path 60 arranged in the upper ring 55. This arrangement is better visible in the partial view of the figure 9 , where the other ring 57 has not been shown, the shaded area 61.1 of the axis 61 here symbolizing the other ring 57 by the area where said axis is journalled in said ring. The ring 57 is therefore almost identical to the ring 55, but does not have the four straight and oblique cam paths 60.

On the figure 3 there is shown a conventional type cutting system which could equip the laying device of the aforementioned type, with in a), the two blades 28 which are in the retracted position, that is to say that the tip 68 of the end of the blade 65 is at a distance (for example 3 mm) from the sheath wall 13, facing the groove 24 of the shaper 20.

In b), the tip 68 of each blade 28 comes into contact with the sheath wall 13 to pierce said wall.

In c), each blade 28 is in the cutting position.

If we now turn to the detail of the figure 4 , one distinguishes the point of attack J of the blade 28 whose cutting edge 66 is here rectilinear. The orientation of the blade 28 is in this case such that at this point J, the tangent to the cutting edge of the blade (half-right Δ) forms with the tangent to the sheath wall 13 (half-right T ), in the direction of rotation 101, an angle α which is obtuse, in this case of the order of 130 °. This shows that the blade 28 then exerts on the sheath wall 13, at the point J, a force F directed towards the inside of the groove 24, which illustrates the adverse effect of thrust mentioned above.

To remedy this, the invention proposes a more efficient solution, with here two embodiments given by way of non-limiting example, respectively illustrated in FIGS. Figures 5, 6 , 10 and to Figures 7, 8 , in which the or each blade 28 has a free end 65 which is arranged to pierce the wall of the sheath 13 and cut said wall while exerting thereon a force F directed radially outwardly.

Thus, the arrangement of the free end of each blade 28 is such that the wall of the sheath 13 is first pierced, then cut by being pulled radially outwardly during the rotation of the blade support around the blade. X axis of the shaper 20, which prevents each cutting lip to be pushed inside the groove 24, with the disadvantages that have been noted above with respect to prior art.

A first way of ensuring this double function of cutting and drawing the wall cut in a radially outer direction consists in providing that the free end, denoted 65, of the or each cutting blade 28 is shaped as a hooked beak, as illustrated in Figures 5, 6 , and 10 .

This crooked beak conformation is clearly visible on the figures 6 and 10 , where it can be seen that the hooked free end 65 has a concave arc-shaped cutting edge 66 extending to a point 68 of the blade, the other edge 67 (non-cutting) is convex arc-shaped. Each blade 28 is mounted on its blade holder 62, being held in an associated slide 63 of said blade holder by means of pins 70 of the blade holder received in an oblong slot 69 of the blade 28. Each blade 28 is thus arranged to rotate about an axis X1 parallel to the X axis of the shaper, the reciprocating pivoting of the blade 28 being between a rear position or withdrawal, in which the tip 68 is not in contact with the wall of the sheath 13, and a cutting position, wherein said tip 68 has passed through the wall of the sheath to be cut and has penetrated slightly into the associated groove 24 of the shaper 20.

We will note on the figure 10 that the blade 28 is fixed on its blade holder 62 by an individual quick-release fastening means, which here consists of a sliding bar 64 arranged to pass over the blade 28 in order to maintain it, or to release said blade to allow removal. On the figure 10 this slide bar 64 is shown in the holding position, and it suffices to act manually on a projecting lug 64.1 of said bar to retract it and access the blade 28 for removal.

As well as this is better visible on the view of the figure 6 , the blade 28 is then arranged so that its hooked end 65 intersects the wall of the sheath 13 while maintaining an orientation such that the two aforementioned tangents T and Δ, at the point of attack J, are between them α angle less than 90 °, for example here about 75 °. The force F exerted on the sheath wall at the point J is then turned outwardly of the groove 24 of the shaper 20, thus illustrating the effect of traction obtained which avoids pushing the sheath wall into said groove.

Another way to ensure the dual function of cutting and pulling the wall cut in one direction radially outer is to provide that the free end 65 of the or each blade 28 has a cutting edge 66 which is rectilinear, and whose direction defines the tangent to the cutting edge Δ, and with a direction of the blade which is modified (for example by changing the direction of the slide 63 of the blade holder 62) to maintain an angle α which is less than 90 °, for example 60 ° to 80 °, in contrast to the arrangement of figures 3 and 4 where the cutting edge 66 is rectilinear, but where the angle α is obtuse.

This is illustrated in Figures 7 and 8 , where we have kept the same references, and where we find ( figure 8 ) a force F exerted at the point J which is turned outwards.

As can be seen in the detail view of the figure 11 , the pivoting of the blade 28 is adjusted so that the penetration distance of the free end 65 of said blade in the groove 24 of the shaper 20 is just sufficient to ensure the passage of the wall of the sheath 13. This penetration distance , which is indicated by a parameter a2, will for example be about 2 to 3 mm, so in this case close to the separation distance a1 in the retracted position of the blade 28 ( figures 5 and 7, a) ). The adjustment of this penetration distance must, however, be chosen with care if it is desired to obtain the desired double effect of both piercing and pulling the wall of the sheath in an outer direction. In practice, the penetration distance should not exceed a value of about 3mm, otherwise it becomes very difficult to exercise the desired traction force F.

In the context of the invention, there is thus provided a support consisting of two superimposed rotating rings 55, 57, driven in rotation about the X axis by the respective belts 56, 58 which are connected to the output shaft of the aforementioned drive motors 48, 49. The two superposed rings 55, 57 are driven in rotation to speeds close to each other, with a slight alternating phase shift which is here driven by the common electronic programmer 50. Indeed, it is found that the cam system 59, with its cams 59.1 sliding in their cam path 60, is arranged such that a rotation speed difference (in one direction or another) between the rings 55, 57 imparts a movement to each cam of the cam system 59, and consequently a pivoting of each door lamina 62 around its axis X1. Thus, controlling the angular phase shifts between the rings 55, 57 ensures a very precise control of the pivoting of each of the blades 28 between their retracted position and their cutting position. The alternating pivoting of the blades 28 is thus perfectly controlled, in speed and in position, by the difference in rotation of the two superimposed rings 55, 57.

The height of the groove 24, denoted h, as illustrated on the figure 11 , will be chosen so that the blade 28 can penetrate without risk of interference in said groove at the highest rates.

It has thus been possible to produce a device for fitting sleeves on scrolling objects which substantially improves the previous device of the document. WO-A-99/59871 , significantly improving the quality of the cut of the sheath to define the section of sheath cut to eject.

The laying machine allows use at very high speeds, for example 600 rounds per minute, and with sheaths whose constituent film is thin, for example 25 microns, and low density, for example a density less than 1.

The invention is not limited to the embodiment which has just been described, but on the contrary covers any variant using, with equivalent means, the essential characteristics mentioned above.

Claims (11)

Device for fitting sleeves on moving objects, said sleeves being cut from a continuous sheath (13) passing over a sheath opening shaper (20) having a central axis (X), which shaper (20) is kept floating between first outer rollers (30,31) and counter rollers (25,26) of parallel axes carried by said shaper (20), up to and beyond a cutting means (27). ), second outer rollers (32,33) being provided downstream of the cutting means (27) for ejecting the cut sheath section (15) on an object (10) directly above the shaper (20). passing said object in front of a cell (80), the cutting means (27) having at least one blade (28) mounted on a support (29) which is arranged to rotate about the shaper (20), the or each blade ( 28) being pivotable on said rotating support while remaining in a plane (P) substantially perpendicular to the axis (X) of the shaper (20), in d of a groove (24) of said shaper, alternatively between a retracted position and a cutting position in which it partially penetrates into said shaper groove, characterized in that the alternating pivoting of the or each blade (28) between its retracted position and its cutting position is provided by means of a cam system (59) by the difference in rotation of two superposed rotating crowns (55, 57) constituting the support of said blade, one of which ( 55) has a cam path (60) parallel to the section plane (P) and oblique direction, in which slides a cam (59.1) which is integral in rotation with a blade holder (62) via an axis (61) parallel to the common axis (X) of the rings (55, 57) and journalled on the other ring (57), and in that the or each blade (28) has a free end (65); ) which is arranged to pierce the wall of the sheath (13) and cut said wall while exerting on it a force (F) directed radially outwards. Sleeve installation device according to claim 1, characterized in that the or each blade (28) is arranged so that its end (65) intersects the wall of the sheath (13) while maintaining an orientation such that the tangent to the edge cutting (Δ) forms with the tangent to the sheath wall (T), in the direction of rotation (101) of the support (29) of said blade, an angle (α) less than 90 °. Sleeve installation device according to claim 2, characterized in that the angle (α) between the two tangents (Δ, T) is chosen to be close to 75 °. Sleeve installation device according to claim 2 or claim 3, characterized in that the free end (65) of the or each blade (28) is shaped hook beak. Sleeve delivery device according to claim 4, characterized in that the hooked free end (65) of the or each blade (28) has a concave arc-shaped cutting edge (66) extending to a point (68) of said blade whose other edge (67) is convex arc-shaped. Sleeve-placing device according to claim 2 or claim 3, characterized in that the free end (65) of the or each blade (28) has a cutting edge (66) which is rectilinear, and the direction defines the tangent to the cutting edge (Δ). Sleeve installation device according to one of claims 1 to 6, characterized in that the or each blade (28) is fixed on its blade holder (62) by a quick release individual fixing means (64). Sleeve installation device according to claim 7, characterized in that the individual means of rapid disassembly fastening comprises a sliding bar (64) arranged to pass over the blade (28) in order to maintain it, or to release said blade so to allow the removal. Sleeve installation device according to one of claims 1 to 8, characterized in that the carrier (29) carries a plurality of blades (28) angularly distributed and arranged to pivot in a common plane (P). Sleeve installation device according to claim 9, characterized in that the cam system (59) is arranged in such a way that the blades (28) rotate synchronously in a single movement between their retracted position and their cutting position. Sleeve installation device according to claim 10, characterized in that the alternating pivoting of the blades (28) is adjusted so that the penetration distance (a2) of the free end (65) thereof in the groove (24) ) of the shaper (20) is just sufficient to ensure the passage of the wall of the sheath (13), in particular about 2 to 3 mm.

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