EP0812634B1 - Carousel coiling apparatus - Google Patents

Abstract

The winder consists of a number of mandrels (21, 21') in a housing turning about a fixed support, each connected to a motor shaft (5) in bearings. Each motor has a rotor (32) and a stator (33) and is mounted in an individual frame so that each mandrel, drive shaft and rotor form an separate assembly which is interchangeable and has an axis lying parallel to that of the support. Each motor and mandrel assembly has a flat base which can be mounted on a corresponding platform on the rotary frame, the base and frame being equipped with engaging centering and fixing elements.

Description

The subject of the invention is a carousel winder for winding of a strip product, usable in particular in a rolling installation and metal strip processing.

A metal strip production facility includes various apparatus, in particular for rolling, leveling, pickling or other treatments. When leaving part of the installation, the strip must generally be wound on a reel, to be easily transported to another part or any other place of use.

We use for this purpose a winder comprising a mandrel driven in rotation about its axis and on which the strip is wound to form a coil. The mandrel is provided, in a known manner, with expansion means retractable to evacuate the coil after winding and is generally associated with ancillary devices such as, for example, a belt wrapper facilitating the start of winding, and means evacuation of the wound coils.

In some sophisticated facilities, especially those that work in continuous flow, like coupled rolling mills or lines, it is necessary to have output equipment specially adapted to large production capacities.

In particular, as soon as a coil has reached the desired dimensions, we must shear the tape and immediately engage it on another winder. A strip accumulator does not stop rolling during change of winder, but it obviously takes as long as necessary be as small as possible.

Usually, such an installation therefore comprises two winders independent each with a belt wrapper and a carriage reel evacuation. The passage of the product, after shearing, of a winder to another, is provided by a referral system. Such a provision is very bulky and expensive, especially because of the costs infrastructure it requires.

To reduce the size of the winding installation, we have already proposed to use, instead of two independent winders, only one apparatus comprising two winding mandrels mounted on a rotating frame drum-shaped, rotatably mounted around a central axis, each mandrel being fixed in cantilever on a drive shaft rotatably mounted on the drum around an axis parallel to the central axis thereof.

It is thus possible to successively place one or the other of the mandrels in the tape winding position, by simply rotating the drum around its axis (DE-A-3346219, JP-A-61-124478).

Such a so-called "carousel" winder requires only one wrapper and a single reel evacuation cart, which reduces notably the infrastructure costs. Furthermore, the engagement geometry bands being constant, the switching device is no longer necessary.

However, to allow the positioning of one or other of the mandrels and the separate control of the rotation of the mandrel located in winding position, existing installations of this type are of a fairly great mechanical complexity and call, in particular, on many pinions, transmission shafts, bearings, clutches, dog clutch, etc.

To simplify the mechanical arrangements, it has also been proposed, in the document JP-A-61-124478, to associate an electric motor with each mandrel, comprising a rotor rotating inside a stator, the latter being fixed on the drum and the rotor being secured in rotation with the drive shaft of the mandrel.

In this way, each drive motor of a mandrel must simply be connected to a source of electrical energy, by a supply circuit which can advantageously go through the central shaft of rotation of the drum, the selective control of the rotation of one or the other of the mandrels being thus performed easily.

Such an arrangement therefore makes it possible to eliminate the mechanisms drive the two mandrels by replacing them with motors autonomous. However, the entire device remains quite heavy and bulky and we can fear an overheating of the electric motors placed inside of the drum.

The subject of the invention is a particularly simple new arrangement. and light which also makes it possible to considerably simplify the installation mandrels and maintenance of the drive assembly.

The invention therefore applies, in general, to a winder with carousel for winding a strip product on one or the other of at least two winding mandrels, comprising a rotating frame rotatably mounted on a fixed support around a central axis, at least two winding mandrels cantilevered, each in the extension of a mounted rotation shaft rotatable on two spaced bearings carried by the rotating frame and defining an axis winding of the mandrel parallel to the central axis of the frame and eccentric with respect to to it, at least two motors each associated with a mandrel and comprising each a rotor and a stator fixed in rotation, respectively, on the shaft of the mandrel and on the rotating frame and centered on the winding axis, means for controlling the rotation of the frame around its axis for positioning of one or other of the mandrels in the winding position and of the means of supplying energy to each motor for driving the corresponding mandrel.

According to the invention, each motor associated with a mandrel is mounted in an independent chassis on which the motor stator is mounted and the two centering bearings of the rotation shaft carrying the rotor and the mandrel, and the rotating frame is provided with at least two support members, each, of a motor-mandrel assembly comprising a mandrel, its shaft rotation and the associated motor, each support member being associated with removable means for centering and fixing the chassis of such a motor-mandrel assembly in a position for which the winding axis defined by the bearings is parallel to the central axis, each motor-mandrel assembly constituting thus an interchangeable module.

In a preferred embodiment, the chassis of each assembly motor-driven chuck comprises a substantially flat base capable of being applied on a corresponding platform provided on the rotating frame and constituting the support member of the corresponding motor-mandrel assembly, said base and said platform being provided with conjugate centering members and removable fixing of one on the other. In particular, the rotating frame advantageously comprises at least two fixing platforms, each, of a motor-mandrel assembly, which are placed symmetrically from on either side of a shaft pivotally mounted on the fixed support and defining the axis central of the frame.

Preferably, the central shaft is provided, at its end turned to the side where the mandrels are placed, a rotating support flange on which is provided a circular track resting on at least two separated rollers, the other end the central shaft being centered in a bearing mounted on a fixed support, the relative levels of the two rollers and the bearing being determined so that the axis of the central shaft is substantially horizontal.

According to another particularly advantageous characteristic, the flange support is provided with at least two notches each associated with a member of support and each having a width at least sufficient for the passage of a mandrel during the fitting of a motor-mandrel assembly on said member support and the circular support crown comprises at least two fixed sectors formed on the support flange between said notches and at least two mobile sectors each provided on the chassis of a motor-mandrel assembly, said fixed and mobile sectors having the same radius of curvature so as to reconstruct a continuous circular support track after installation of the assemblies motor-mandrels on the corresponding support members.

The chassis of the motor-mandrel assembly must, of course, be sufficiently reinforced to maintain the stator, the rotation shaft and the mandrel cantilevered so as to constitute a rigid carcass capable of to participate in the resistance of the whole.

Preferably, each rotation shaft can be provided with a cone of short centering allowing rapid disassembly and reassembly of the mandrel and authorizing the use of mandrels of different diameters and different technologies.

On the other hand, the motor rotor can advantageously be hooped on a sleeve which is threaded on the rotation shaft and secured to it by splines for the transmission of engine torque. However, in some applications, the rotor can be hooped directly on the rotation shaft.

Other advantageous features are the subject of claims particular.

However, the invention will be better understood from the following description of certain particular embodiments, given by way of example and shown in the accompanying drawings.

Figure 1 is a side view of the assembly of a winder according to the invention, with partial removal of the mandrels.

Figure 2 is a view of the rear of the winder, in section along the line II-II of Figure 1.

Figure 3 is a top view of the winder.

Figure 4 is a longitudinal sectional view along line IV-IV of the Figure 2.

Figure 5 is a longitudinal sectional view with partial disassembly chucks or motors.

Figure 6 is a front view, along arrow VI of Figure 1.

Figures 7, 8 and 9 show the rotating frame, respectively in axial section, in top view and in front view.

Figure 10 is a detail view, in axial section, of another mode of production of a motor-mandrel assembly.

Figure 11 is a front view of the chassis of a motor-mandrel assembly.

In Figures 1 and 2, there is shown, respectively in side view and in rear view, the whole of a winding installation according to the invention comprising a rotating frame 1 rotatably mounted about an axis 10, normally horizontal, and bearing, in the example shown, two motor-mandrel assemblies 2, 2 'which are fixed on the rotating frame 1, symmetrically on either side of the axis of rotation 10.

Each 2, 2 'motor-mandrel assembly includes a 3, 3' motor drive in rotation of a shaft 5, 5 ', centered on an axis 20, 20' parallel to the central axis 10 of the frame and on which is mounted a cantilever mandrel which has partially shown in Figure 1.

As shown in Figures 7, 8 and 9, the rotating frame 1 forms a mechanically welded assembly comprising a tubular shaft 11 fixed to one of its ends, on a flange 13 perpendicular to the axis 10 of the shaft 11, and two plates 12, 12 ', parallel to each other and to the axis 10, welded to the flange 13 and on the central shaft 11, respectively along two generators diametrically opposite. Each plate 12, 12 'forms a platform for support of a motor-mandrel assembly 2, 2 'carrying a mandrel 21, 21' which extends cantilevered on the opposite side, passing through an opening in the flange 13.

On the side of the winding, the frame 1 is supported on two separated rollers 41, 41 'rotatably mounted around horizontal axes on a fixed support 4, by through a circular support track 14 formed on the periphery of the flange 13.

At its opposite end, the central shaft 11 is carried by a bearing 42 mounted on a fixed base 43 formed on the foundation, and whose axis is placed at the desired level with respect to the rollers 41, 41 'so that the axis 10 of the shaft central 11 is substantially horizontal.

Along the support track 14 is fixed a ring gear 44 on which meshes a pinion 41 'attached to one of the support rollers 41 and driven in rotation by an auxiliary motor 45 which thus controls the pivoting of the frame 1 around the axis 10 for the positioning of one or the other of the mandrels 21, 21 'in the winding position.

To maintain the frame 1 in each of these two angular positions, the flange 13 is provided with two diametrically opposite stops 18 cooperating with a removable blocking member 46 consisting, for example, of two articulated jaws 46 mounted on the fixed support 4 and actuated by cylinders.

However, in the preferred embodiment shown in the figures, the flange 13 comprises, two walls 13a, 13b welded to the plates 12, 12 ', perpendicular to the axis 10 and forming two circular segments apart, each limited inward by a straight edge 15 and outward by a circular edge 16, so as to provide two wide notches A1, A2 in the flange 13. The stops 18 for blocking the frame 1 are advantageously each consisting of two plates welded to the gussets 17 and extending in projection from runway 14.

Each segment-shaped wall 13a, 13b is reinforced by ribs and the rigidity of the assembly is ensured by four gussets triangular or trapezoidal 17 each extending in the extension of a plate 12, 12 ', on either side thereof, and welded, respectively on the walls 13a, 13b.

The tube 11, the two plates 12, 12 'and the two segments 13a, 13b thus form a rigid carcass of mechanically welded steel comprising two compartments A1, A2 with rectangular section each limited by a plate 12, 12 'and by the straight edges 15a, 15b perpendicular to the latter of the two parts and in which can integrate the two motor-mandrel assemblies 2, 2 '.

As can be seen, in particular in FIG. 10, each motor-mandrel assembly 2 comprises a rotation shaft 5 on which the cantilever is fixed mandrel 21 and which is rotated by a motor 3 placed in a chassis rigid 6 in the form of a cage comprising a cylindrical side wall 61 on which is fixed the stator 31 of the motor 3 and two flanges, respectively before 62 and rear 63. The rotor 32 of the motor 3 is fixed on the rotation shaft 5 which is carried by two bearings 51, 52 mounted respectively in circular orifices centered on the axis 20 of the assembly and formed respectively on the two 62, 63 of the chassis 6. The assembly forms a carcass strong enough to ensure the maintenance, in service, of the shaft 5 carrying the mandrel 21, the side wall 61 being itself reinforced by radiating ribs 64.

On the other hand, the two front 62 and rear 63 flanges of the chassis 6 are provided, respectively, with straight sides 621, 631 placed in the same plane parallel to the axis 20, which define a flat base for the chassis 6, capable to be applied to one of the platforms 12, 12 'when the motor-mandrel assembly is placed in the corresponding compartment A1, A2, in the way shown in particular in Figures 4 and 5.

The frame 6 of each motor-mandrel 2 2 'assembly can be fixed removably on the corresponding platform 12, 12 'simply by four bolts for rapid assembly and disassembly.

In this way, each motor-mandrel assembly comprising a chassis 6 bearing the motor 3, its rotation shaft 5 with these two bearings and, optionally, a mandrel 21 fixed at the end of the shaft constitutes a module for interchangeable winding which can be mounted indifferently in one or the other of the compartments A1, A2 of the central frame 1 which is perfectly symmetrical.

In the preferred example shown in the figures, the bolts 7 of chassis fixing 6 are fixed to the four angles of each platform support 12, 12 'and extend vertically so as to engage in corresponding bores 71 formed at the base of the two flanges 62, 63 of the chassis 6, symmetrically on either side of the median plane passing through the axis 20.

As shown in Figure 2, the rear flange 63 is provided simply of an enlarged base so that the bolts 7 engaging in the bores 71 provided at its two ends open to the outside to allow the fitting tightening nuts 72.

On the other hand, the front flange 62 shown in FIG. 11 includes two lateral sides 623 perpendicular to the lower side 621 and in which notches 65 are provided.

At least over part of their height, for example above the notches 65, the lateral sides 623, 623 ′ are spaced a little apart greater than the distance between the edges 15a, 15b of the two segments and are provided grooves 66 which engage on said segments to ensure the centering of the chassis and its attachment to the flange 13 during the installation of the chassis 6 on the platform 12. The heads of the bolts 7 open into the notches 65 to allow tightening of the bolts 72.

Preferably, the fixing platform 12 is provided, on the opposite side to the mandrels, a central nipple 18 placed in the median plane passing through the axis 10 and which engages in a corresponding bore in the rear flange 63 of the chassis 6 to guarantee the centering of the latter on the plate 12 in a position for which the axis 20 of the mandrel 21 and of the rotation shaft 5 is strictly parallel to the central axis 10 of the rotating frame 1 in the position of work of the motor-mandrel assembly.

Furthermore, the upper side 622 of the front flange 62 opposite the base 621, has a circular profile of the same radius as the outer edges 16a, 16b of the two segments 13a, 13b, so as to reconstitute a circular flange after the installation of the frames 6, 6 'in the openings A1, A2.

The support track 14 is therefore formed of four parts, respectively two fixed parts 14a, 14b and two mobile parts 14c, 14'c made up each of a curved profile in the shape of a circular sector and fixed respectively along the outer sides 16a, 16b of the two segments 13a, 13b and on the curved side 622 of the chassis 6 of each motor-mandrel assembly 2, 2 '. Said fixed and mobile parts are connected tangentially to make a continuous circular track 14 after installing and fixing the frames 6, 6 'of the two motor-mandrel assemblies 2, 2' on the platforms 12, 12 'of the frame 1.

Likewise, the ring gear 44 is divided into two fixed sectors 44a, 44b and two mobile sectors 44c, 44'c fixed respectively along the four corresponding parts of circular track 14 so as to be placed in the extension of each other to reconstitute a circular crown 44 meshing with the pinion 41 '.

Note the lightness and great simplicity of the central frame 1 in welded construction which, after blocking the bolts 7, forms a compact set with chassis 6 of, 6 ', the latter simply in front be sufficiently reinforced so as to constitute a carcass, sufficiently resistant to participate in the rigidity of the whole.

As indicated above, each motor-mandrel assembly forms an interchangeable module which can be dismantled as a unit and transported in workshop for maintenance.

However, according to other advantageous provisions of the invention, each motor-mandrel assembly is made in a way that allows easy disassembly of the different parts, either in the workshop or directly on the winder, as shown schematically in Figures 4 and 5 which are views in longitudinal section through an axial plane showing, the assembly of the winder and how to dismantle certain parts.

Each mandrel 21, which may be of known type, is provided, at its base, a fixing plate 22 extended by a centering cone 23 which can engage in a corresponding conical recess 53 of the rotation shaft 5, which has a flared end so as to constitute a flange 54 on which is applied the fixing plate 22 of the mandrel, the assembly being secured, in a conventional manner, by screws.

Keys 26 which engage in corresponding grooves of the conical recess 53 ensures the rotation cone of the cone of centering 23 with the rotation shaft 5.

Conventionally, the shaft 5 is provided with an axial bore in which passes a rod 24 for controlling the operations of the mandrel, actuated by a control mechanism 25 fixed on the rear end of the shaft 5.

The centering cone 23 advantageously has a fairly long reduced so that the corresponding conical space 53 of the shaft 5 extends only over a length thereof corresponding substantially to the interior of the front bearing 51 so as not to reduce the resistance of the part central of the shaft 5 carrying the rotor 32 of the motor 3.

In the case of FIGS. 4 and 5, where the mandrel 21 is fixed by the plate 22 on a flange 54, this blocks the front bearing 51 which, if necessary, must therefore be dismantled from the rear. This is why, the rotor 32 of the motor is shrunk on a tubular sleeve 33 which is threaded on the central part of the shaft 5. Grooves 34 are formed on the sheath 33 to engage in corresponding grooves of the shaft 5 so as to secure the connection in rotation of rotor 32 with shaft 5.

Furthermore, the front bearing 51 is housed in an orifice made in the front flange 62 whose diameter must be slightly greater than the diameter of the rotor 32 to allow passage thereof.

Thus, it is possible to disassemble from the front, for maintenance, the assembly of the shaft 5 carrying the rotor 32, the front bearing 51 and the mandrel 21, the chassis 6 remaining fixed on the frame 1 with the stator 31 as shown in FIG. 5.

However, as shown for the lower assembly 2 ', it is also possible to leave in the chassis 6 the whole of the motor 3 and the shaft 5, by simply removing the mandrel 21 ', for example to replace it by a mandrel of another type or another dimension.

The winder which has been shown in FIGS. 4 and 5 is adapted to the winding of very thin products, for example tinplate.

However, thanks to the use of interchangeable modules, the installation can be adapted to the winding of more resistant products, for example thin sheets of steel, without modifying the supporting frame 1, the mounting of each motor-mandrel assembly being simply adapted to the forces to be collected for the winding.

In particular, so as not to excessively reduce the section of the part center of the shaft 5, the rotor 32 can be shrunk directly onto the shaft of the as shown in Figure 10.

In this case, the bearing 51 must be removed from the front and the flange fixing of the mandrel is provided on a separate ring 55 fixed by screws on the front end of the shaft 5.

But other characteristics of the invention shown in the drawings, have particular advantages.

For example, the use of a tube 11 to constitute the central shaft of the rotating frame 1 allows the cables to pass inside this tube electric power supply and motor control 3, 3 'as well that the hydraulic fluid passage pipes for the control expansion and constriction of the mandrels and lubrication of the bearings, which can be gathered on the rear end of the central shaft 11 and connected to means for supplying fluid by a rotating joint 27.

Similarly, the electric cables for supplying the motors 3 are connected to a manifold 35 disposed at the rear end of the shaft 11, in the axis of the hydraulic connection 26.

In this regard, it should be noted that one can advantageously use asynchronous motors for driving the chucks. In this way, in fact, no power supply is required for the rotors which, as we have seen, are fixed on the rotation shaft of each assembly and disassemble with it.

If the internal cross section of the tubular shaft 11 is sufficient, this can be used for forced ventilation of motors, ventilation air being discharged in the central tube 11 and passing through corresponding orifices provided in the tube 11, the fixing plate 12 and the wall 61 of the chassis to cool the motor venting through an annular space formed between the front flange 62 and the corresponding end of the side wall 61 which is connected to the flange front by gussets 65 placed in the extension of the ribs 64.

However, in the embodiment shown in the figures, the ventilation is ensured by an annular box 8 connected by ducts 81 to envelopes of the two motors, as shown in FIGS. 3, 4 and 5, the tubular central shaft 11 is used simply for the passage of the cables of electrical supply connected to the manifold 35 and of the hydraulic pipes connected to the swivel connector 26.

The ventilation box 8, which is fixed in rotation is limited by a wall tubular lateral 82 and two flanges 83, 84 each provided with a central orifice passage of the tree 11.

The rear flange 83 is integral with the wall 82 and associated with a seal sliding 83 'ensuring the seal with the shaft 11.

The front flange 84 is fixed on the shaft 11 and therefore rotates with the latter. This is why it is provided, on its periphery, with an annular seal 84 ' applied against the wall 82 to ensure sealing.

The box 8 has a ventilation circuit opening into an orifice 80 formed on the rear flange 83 or the side wall 82.

On the front flange 84, which rotates with the shaft 11 are provided two diametrically opposite orifices to which two sheaths 85 are connected, 85 'opening into two lateral boxes 86, 86' fixed respectively on the platforms 12, 12 ', on either side of the central axis 10 and each provided with two branches which open at the base of the two compartments A1, A2 in which are threaded the chassis 6 of the two motor-mandrel assemblies.

Each branch 86 is provided with a curved outlet end 87 on which comes to apply the chassis 6 of a motor-mandrel assembly, during the installation thereof, and which opens into an orifice 88 formed in the wall tubular 61, for example between two ribs 64.

The air introduced under pressure into the annular box 8 is thus discharged to inside the chassis 6 of the engine and escapes through the annular space 65 formed between the external wall 61 and the front flange 62 of the chassis 6.

Of course, the invention is not limited to the details of the modes of realization which have just been described as a simple example, and which could be subject to variations, without departing from the protection framework defined by the claims.

For example, if the use of asynchronous motors for control of rotation of the mandrels of the electric motors allows to simplify power, other types of motor could also be used. Besides, these motors could also be powered by energy hydraulic or pneumatic when power can be obtained necessary for winding.

In addition, it is particularly advantageous to fix each set motor-mandrel on a single platform by means of four bolts, but the support members of the motor-reduction units could, however, be done in another way.

In addition, it would be possible, if necessary, to carry out a winder carrying more than two motor-mandrel assemblies, the rotating frame can, for example, be equipped with three platforms angularly offset by 120 °.

Similarly, other arrangements could be envisaged for the mounting of the motor, in particular the production of the rotation shaft and bearings, fixing the chuck and its control system, all types of chucks that can be used.

The reference signs inserted after the technical characteristics mentioned in the claims, have the sole purpose of facilitating the understanding of them, and in no way limit their scope.

Claims (20)

1. A turntable coiler for the reeling of a strip product on one of at least two reeling mandrels, comprising a rotary frame (1) mounted rotatably on a fixed bracket (4) around a central axis (10), at least two reeling mandrels (21) fixed cantilever, each in the alignment of a rotation shaft (5) mounted rotatably on two spaced bearings (51,52) supported by the rotary frame (1) and defining a reeling axis (20) of the mandrel parallel to the central axis (10) of the frame (1) and eccentric with respect to the latter, and at least two motors (3) each connected to a mandrel (21) and comprising each a rotor (32) and a stator (33) centred around the reeling axis (20), means (44) for controlling the rotation of the frame (1) around its axis (10) for selective indexing of one of the mandrels in reeling position and means (35) to supply each motor (3) with power in order to drive the corresponding mandrel (21), characterized in that each motor (3) connected to a mandrel (21) is mounted in an individual chassis (6) on which are mounted the stator (31) of the motor (3) and both centring bearings of the rotation shaft (5) so that each mandrel (2), its rotation shaft (3) and the motor connected constitute an independent motor-mandrel assembly (2) and that the rotary frame is provided with at least two supporting devices of such a motor-mandrel assembly (2,2'), each connected to removable means for centering and fastening the chassis (6) in a position for which the reeling axis (20) defined by the bearings (51,52) is parallel to the central axis (10), whereas each motor-mandrel assembly thus constitutes an interchangeable module.
2. A coiler according to claim 1, characterized in that the chassis (6) of each motor-mandrel assembly (2) comprises a base (62) (631) which is substantially plane and able to be applied onto a corresponding platform (12) provided on the rotary frame (11) and constituting the supporting device of the corresponding motor-mandrel assembly, whereas the said base (621,631) and the said platform (12) are provided with combined centering and fastening devices (73,74,7,71) which can be disconnected from one another.
3. A coiler according to claim 2, characterized in that the rotary frame (1) comprises a central shaft (11) mounted pivotably on the fixed bracket (4) around an axis (40) and on which are fastened rigidly at least two platforms (12,12') arranged symmetrically on either side of the said central shaft (11) and each constituting the supporting device of a motor-mandrel assembly (2,2').
4. A coiler according to one of the preceding claims, characterized in that the rotary frame comprises at least one flange (13) fastened to one end of the central shaft (11) perpendicular to the latter and on which is provided a circular bearing track (14) centred on the axis (10) of the shaft and rolling over at least two spaced rollers (41) mounted rotatably on the fixed bracket (4) each around an axis parallel to the central axis (10) of the frame (1).
5. A coiler according to claim 4, characterized in that the central shaft (11) is connected to a single rotary bearing flange (13) fastened to one of the ends oriented towards the mandrels, whereas the other end is supported by a bearing (42) mounted on a fixed bracket (43), located at a certain distance so that the axis (10) of the shaft (11) is horizontal.
6. A coiler according to one of claims 4 and 5, characterized in that the bearing flange (13) is provided with at least two identations (A₁, A₂) each connected to a supporting device (12) and each of a breadth at least sufficient to allow passage of a mandrel (21) when fitting a motor-mandrel assembly (2) to the said supporting device (12) and that the circular bearing track (14) comprises at least two fixed sectors (14a, 14b) provided on both parts (13a,13b) on the bearing flange and extending between the said identations (A₁, A₂) and at least two moveable sectors (14c,14'c) provided each on the chassis (6) of a motor-mandrel assemby (2), whereas the said fixed and moveable sectors exhibit the same curving radius in order to build a continuous circular bearing track upon completion of the fitting of the motor-mandrel assemblies (2,2') on the corresponding supporting devices (12,12').
7. A coiler according to claim 6, charachterized in that the rotary frame (1) comprises two parallel plates (12,12') fixed on either side of the central shaft (11) and each forming a platform for the fastening of a chassis (6) of a motor-mandrel assembly (2,2'), that the bearing flange (13) comprises two spaced parts (13a,13b) in the shape of circular segments, whereas each exhibits an external circular rim (16a,16b) on which are provided a fixed sector (14a,14b) of the bearing track (14) and an internal rim (15a,15b) perpendicular to both parallel platforms (12,12') and that the chassis (6) of each motor-mandrel assembly (2,2') comprises, on the mandrel side (21), a flange (62) defined by two parallel rims (623,623') perpendicular to the base (621) of the flange (62) and whose spacing corresponds, given the existing backlash, to the breadth of the identation (A₁, A₂) between the internal parallel rims of both bearing segments of the flange (13) whereas the parallel rim (623,623') of the flange (62) of each motor (6) are provided with grooves (66) able to slidably engage onto the corresponding internal rims (15a,15b) of both segments (13a,13b) when fitting a motor-mandrel assembly (2) on the corresponding platform (12) of the frame (1).
8. A coiler according to claim 7, characterized in that each platform (12,12') is provided with a centring device (73) cooperating with a combined device provided on the rear flange (63) of each motor (6) for the centring of the motor-mandrel assembly (2) on the platform (12) in a position for which the axis (20) of the rotation shaft (15) is strictly parallel to the axis (10) of the frame (1).
9. A coiler according to one of the preceding claims, characterized in that each mandrel (21) is provided with a fastening plate (22) able to be applied onto a flange (54,55) provided at the front end of the rotation shaft (5).
10. A coiler according to claim 9, characterized in that the flange (54) is made up of a flared section provided on the corresponding end of the rotation shaft (5).
11. A coiler according to claim 9, characterized in that the flange (54) is made up of a ring-shaped part fastened removably on the corresponding end of the rotation shaft (5).
12. A coiler according to one of the preceding claims, characterized in that each mandrel (21) is provided, at one fastening end on the rotation shaft (5), with a conical centring part (23) able to engage into a corresponding conical recess (53) of the rotation shaft (5) and extending over quite a short length so that the conical recess (53) covers substantially the same length as the corresponding bearing (51) of the shaft (5) whereas combined devices (26) for proper attachment during rotation are interposed between the said centring part (23) and the conical recess (53).
13. A coiler according to one of the preceding claims, characterized in that the rotor (32) of the motor (3) is shrunk on a tubular sleeve (33) able to be inserted onto the rotation shaft (5) and provided with ribs (34) cooperating with corresponding grooves of the shaft (5) for attachment during rotation of the latter with the sleeve (33) and the rotor (32).
14. A coiler according to one of claims 1 to 12, characterized in that the rotor (32) is shrunk directly on the rotation shaft (5).
15. A coiler according to one of the preceding claims, characterized in that the central shaft (11) of the frame (1) comprises a tube in which are provided circuits for supplying power to the motors (3,3') and for controlling the mandrels (21,21').
16. A coiler according to one of the preceding claims, characterized in that the chassis (6) of the motor (3) forms a stiff carcass comprising a front flange (62) and a rear flange (63) carrying respectively both bearings (51,52) of the rotation shaft (5) and linked by a tubular wall (61) provided with reinforcement fins (64) and on which is fastened the stator (31) of the motor (3).
17. A coiler according to claim 16, characterized in that the front bearing (51) of the shaft (5) oriented to the mandrel side (21) is housed in an opening provided in the front flange (62) of the chassis (6) and having a diameter slightly greater than that of the rotor (32) to allow drawing, in a single motion, of the shaft (5) with the said rotor (32) to allow drawing, in a single motion, of the shaft (5) with the said rotor (32) through the said opening.
18. A coiler according to claim 16, characterized in that a space (65) is left between one of the flanges (62) of the chassis and the corresponding end of the tubular wall (61), at least on a portion of the periphery of the latter, to allow exhaust of the cooling air injected inside the said chassis (6) through at least one inlet opening (88) provided in the said tubular wall (61) and able to be connected, when fitting the chassis (6), to a circuit (87) carried by the frame (1) and in which the cooling air is discharged.
19. A coiler according to claims 15 and 18, characterized in that, when fitting the chassis (6) to the frame (1), the inlet opening (88) is applied to a corresponding opening provided on the central tubular shaft (11) of the frame (1) and inside which the cooling air is discharged.
20. A coiler according to claim 18, characterized in that the frame (1) is associated with a ring-shaped caisson (8) surrounding an end of the central shaft (11) opposite to the bearing flange (13) and comprising a fixed section (82,83) provided with an opening (80) allowing inlet of pressurised air and a moveable section (84) fixed on the central shaft (11), with interposition of sliding gaskets (83',84') between the fixed and moveable sections and that the said moveable section (84) is provided with at least one exhaust opening on which is connected at least one sheath (85,86) carried by the frame (1) and having an exhaust end (87) against which is applied the air inlet opening (88) of the chassis (6) when fitting the latter onto the frame (1).

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