TUBE COILING/DECOILING MACHINE AND RELATIVE PROCESS

Description

Field of the invention

[0001] The present invention refers to a metal tube coiling/decoiling machine, and the relative process, which can be used in particular downstream of the rolling plants.

State-of the art

[0002] Downstream of the rolling mill for tubes, made of copper for example, a coil-ing/decoiling machine, not made public is normally positioned which has the function of winding the straight tube coming from the rolling mill into a coil, supporting the coil formed and subsequently unwinding it for the drawing processes downstream.

[0003] As the length of a rolled tube is greater than 100 metres, the winding thereof into coils, weighing at least 500 kg, reduces its overall dimensions. The material of these tubes can be easily deformed as it has been annealed by the rolling process upstream.

[0004] Said coiling/decoiling machine has a cross-shaped structure provided with two or four coil supporting stations, each being equipped with two motorised rollers provided with grooves, with axes positioned horizontally supporting the entire weight of the coil.

[0005] Between the rolling mill and the coiling/decoiling machine the following are normally present:

• a shearing unit which cuts the beginning and end of the tube, portions which have been deformed by the last rolling unit and which are therefore non-conforming;
• an independent bending unit, fixed to the ground, which bends the tube to form the coil.

[0006] After being cut by the shearing unit, the beginning of the tube passes through the bending unit at the coiling machine inlet and is bent to form the coil. Between the tip and the first wound turn of the tube, two or more supporting clamps are manually applied to prevent interference with the tip which would otherwise become detached at every turn of the coil. The winding continues until the rolling mill has completed the cycle and the end of the tube is cut as it has been deformed and is therefore non-conforming.

[0007] The machine is then rotated 180° in the case of a machine with two stations, or 90° in the case of a machine with four stations, and the tube is cleaned inside by means of a jet of air directed manually.

[0008] The end of the tube becomes the beginning of the coil for the following processes. The beginning of the coil is prepared for the subsequent drawing operations with insertion of plug and oil inside the tube for drawing of the internal diameter and is squeezed, preferably-tapered, in order to pass through the die plate and be gripped by the traction assemblies downstream, comprising tracks or cam-type pulling benches or other.

[0009] Once the coiling/decoiling machine has been rotated 90°, in the case of four stations, the tapered lead end of the coil is fed manually towards the traction assemblies downstream and the tube is gripped and drawn at speed right through to the last turns of the coil. At this point the drawing speed must be reduced to minimum, the supporting clamps manually removed and the end of the coil manually supported. JP6227598 discloses a coiling machine having a drum provided with a cavity for containing the first and of a tube.

[0010] Disadvantageously when using the machine in the state of the art, numerous operations have to be performed manually during the coiling/decoiling process. This involves a slowdown in production and significant labour costs, in addition to increased operator risks to the detriment of safety:

The need is therefore felt to produce an automatic tube coiling/decoiling machine and relative process able to overcome the above-mentioned drawbacks. Summary of the invention

[0011] The primary object of the present invention is to produce a tube coiling/decoiling machine, used in particular downstream of a rolling mill, which results in a significant increase in production rate by automating numerous operations, consequently reducing labour costs and improving operator safety.

[0012] A further object of the present invention is to provide a relative tube coiling/decoiling process which is more efficient and quicker than the conventional method.

[0013] A further object of the invention is to produce a tube coiling/decoiling machine which allows the coil to be supported without damaging the surface and the shape.

[0014] The present invention, therefore, aims to achieve the above-mentioned objects by producing a coiling/deecoiling machine for at least one tube moving in a pre-determined direction in accordance with claim 1.

[0015] According to a further aspect of the invention, a process is provided for coiling/decoiling at least one tube moving in a pre-determined direction, via use of the above-mentioned coiling/decoiling machine in accordance with claim 8.

[0016] Advantageously the coiling/decoiling machine, subject of the present invention, allows automation of the following operations:

• supporting and guiding the beginning and end of the coil by means of a drum provided with recess or containing cavity, also during movement of the coil from one station to another of the machine;
• restoration of the diameter and internal cleaning of the tube;
• tapering of the tube;
• feed-in of the tapered lead end of the coil towards the traction assemblies downstream.

[0017] A further advantage of the device of the invention is represented by the fact that the machine has, on each arm of the cross-shaped structure, a drum with recess for containing the tube and provided with bending machine/curve aiding device and beginning and end of coil support, thus guaranteeing a high production rate for the entire tube production line.

[0018] The dependent claims describe preferred embodiments of the invention.

Brief description of the figures

[0019] Further characteristics and advantages of the invention will become clearer in the light of the detailed description of preferred but not exclusive embodiments of a tube coiling/decoiling machine illustrated, by way of non-limiting example, with the help of the accompanying drawings in which:

Fig. 1 shows a plan view of the machine according to the invention;

Fig. 2 shows side views of a component of the machine of Fig. 1 in the various stations of said machine;

Fig. 3 shows a side view of the coil winding and unwinding stations of the machine of Fig. 1.

Detailed description of preferred embodiments of the invention

[0020] With reference to the figures cited, a tube coiling/decoiling machine according to the invention, indicated overall by reference number 1, generally provided between a rolling mill (not illustrated) and traction assemblies downstream for the subsequent work processes, comprises a cross-shaped structure 2 and is provided with a work station corresponding to each arm of the cross.

[0021] These work stations comprise:

• a winding station 3 for forming a tube coil;
• a station 4 for tapering one end of the tube;
• a station 5 for unwinding the coil of tapered tube;
• a waiting station 6.

[0022] On each arm of the cross-shaped structure 2 there is a coil supporting drum 7, to which a bending machine 8 is integrally fixed below.

[0023] The cross-shaped structure 2 is suitable for rotating 90° around its axis X to move the drum 7 and bending machine 8 from one station to the other each time during a coiling/decoiling cycle.

[0024] According to the invention the drums 7 are provided with a recess 9 to contain the beginning or tip of the tube coming from the rolling mill and appropriately bent by the bending machine 8. This solution of using drums provided with containing recess permits elimination of the manual operation for application of the supporting clamps between the tip and the first coiled turn of the tube on the motorised rollers to prevent interference with the tip.

[0025] The recesses or cavities 9 of the drums 7 can be provided inside with means for locking and releasing the beginning of the tube coming from the rolling mill.

[0026] Said locking and releasing means are such as not to deform this end of the tube contained in the recess 9.

[0027] The bending machine 8 and drum 7 are motorised by means of respective independent controls 8', 8", 7' 7", engaged/disengaged by means of special joints and fixed on the ground both in the coiling station 3 and in the decoiling station 5, as illustrated in figures 1 and 3.

[0028] In the example of Fig. 3 the independent controls 7', 7" transmit the rotation to the drums 7 around their axes in the stations 3 and 5 by means of a chain transmission system 14 or other suitable system.

[0029] The bending machine 8 and drum 7 are provided with respective brakes, for example disc brakes, independent and mounted on board, so that they can be kept still in position during rotation of the cross-shaped structure and in the tapering station 4 and waiting station 6.

[0030] Upstream of the coiling station 3 a shearing unit is provided (not illustrated) for cutting the beginning and end of the tube coming out of the rolling mill, as the material of these parts of the tube has been deformed during rolling. Alternatively, the rolled tube can come from a warehouse.

[0031] The tapering station 4 is advantageously provided with an automatic tapering unit 10 mounted on a carriage 11 which permits movement thereof to the work position.

[0032] A further advantage is represented by the fact that on the front of the automatic tapering unit 10 a retractable automatic device 12 is fitted for restoring the internal diameter of the tube deformed by the shearing unit and for internal cleaning of the tube.

[0033] The entire coiling/decoiling process of a tube 13, for example a copper tube, coming from a rolling plant or rolling mill, is described below.

[0034] The rolling mill processes the tube 13 having a length greater, for example, than 100 metres, in a straight form.

[0035] When it comes out of the rolling mill, the tip of the tube, after being cut by the shearing unit, passes through the bending machine 8 at the inlet to the coiling station 3 of the machine 1 and is bent to form the coil on the drum 7. Advantageously the tip of the tube is inserted by the bending machine 8, operated by the relative control 8', into the containing recess 9, provided in the drum 7, and is automatically supported during rotation of the drum around its axis controlled by the relative independent control 7'.

[0036] The coiling continues until the rolling mill has completed the cycle and the end of the tube is cut by the shearing unit.

[0037] Once coiling of the tube 13 on the drum 7 has been completed, the cross-shaped structure rotates 90°, moving the coil to the tapering station 4. The end of the tube 13 is supported during rotation of the bending unit 8 and now becomes the tip or beginning of the tube coil for the processes downstream.

[0038] During rotation of the cross-shaped structure and in this tapering station 4, the bending unit 8 and drum 7 are kept still in position by means of two independent disc brakes mounted on board.

[0039] The retractable automatic device 12, on the front of the automatic tapering unit 10, is initially in line with the tube 13. The tapering unit 10 moves forward to the work position and positions itself in contact with the tube so that the device 12 can restore the diameter of the tube and clean it inside.

[0040] Subsequently the tapering unit 10 withdraws to the waiting position, the device 12 shifts and the tapering unit moves forward again to the work position in order to automatically perform the following operations:

• insertion inside the tube of plug and oil for drawing of the internal diameter;
• tapering of the beginning of the tube coil.

[0041] Once the tapering operation has been completed, the tapering unit 10 withdraws again to the waiting position and the cross-shaped structure 2 rotates 90°, thereby moving the coil to the unwinding station 5. During rotation, the tip or beginning of the tube coil is supported by the bending unit 8.

[0042] In this decoiling station 5, the bending unit 8 and drum 7 are operated again by the respective independent controls 8", 7" fixed on the ground and engaged/disengaged by means of special joints.

[0043] The bending unit and drum, rotated in the coil unwinding direction, automatically feed the tube to the traction assemblies 15 downstream, comprising tracks or cam-type pull benches or other. The tube 13 is then gripped and drawn at speed in a drawing machine 16 and the end of the coil is automatically supported by the recess 9 of the drum and by the bending unit 8.

[0044] Once decoiling of the tube 13 has been completed, the cross-shaped structure 2 rotates again 90°, moving the drum 7 and the relative bending unit 8 to the waiting station 6. At this point the machine waits for the next 90° rotation to begin a new coiling/decoiling cycle.

[0045] In a variation (not illustrated) of the coiling/decoiling machine of the invention, the waiting station can be located between the coiling station and the tapering station. This configuration provides a tube coil unwinding direction perpendicular to the rolling direction.

[0046] In this case, once coiling of the tube 13 on the drum 7 has been completed, the process of the invention provides for the cross-shaped structure to rotate 90°, moving the coil to the waiting station. This is followed by three successive 90° rotations of the cross-shaped structure 2 to move the drum 7 and bending unit 8 to the tapering station, to the decoiling station and to the coiling station respectively to begin a new coiling/decoiling cycle.

Claims

1. Machine for coiling/decoiling at least one tube (13) in a pre-determined direction, comprising
bending means (8) to bend a first end of the tube (13) and guide it so as to form a coil,
a cross-shaped structure (2) defining a cross with four arms, wherein each of said arms is provided with means for coiling/decoiling said coil, a workstation (3,4,5,6) corresponding to each of said arms and comprising a coiling station (3) and a decoiling station (5), said cross-shaped structure being suitable for rotating around its longitudinal axis (x),
thereby moving said coiling/decoiling means and said bending means (8) from the coiling station (3) to the decoiling station (5),
wherein said coiling/decoiling means comprise a drum (7), suitable for rotating around its longitudinal axis, provided with a cavity (9) for containing said first end of the tube corresponding to a peripheral portion thereof.

2. Machine as claimed in claim 1, wherein one of said bending means (8), suitable for supporting a second end of the tube coiled on the drum (7) and for acting as an aid during unwinding of the coil, is fixed integrally to each drum (7).

3. Machine as claimed in claim 2, comprising a tapering station (4), in an intermediate position between the coiling (3) and decoiling (5) stations, provided with an automatic tapering unit (10) to taper the second end of the tube, positioned on a carriage (11) which permits movement thereof from a waiting position to a work position.

4. Machine as claimed in claim 3, wherein on the front of the automatic tapering unit (10) an automatic retractable device (12) is positioned suitable for restoring the diameter of the tube and cleaning the inside of the tube before the tapering operation.

5. Machine as claimed in any one of the preceding claims, wherein in said decoiling station (5) traction assemblies (15) are provided suitable for being automatically fed with the tube being decoiled by the corresponding drum (7) and bending means (8).

6. Machine as claimed in any one of the preceding claims, wherein at the level of said coiling (3) and decoiling (5) stations, first controls (7', 7") and second controls (8', 8") are provided, independent from each other, for operating the drums (7) and bending means (8) respectively, said first controls (7', 7") being suitable for transmitting a rotation to the drums (7) around their axes by means of a chain transmission system (14), and joints are provided for engaging and disengaging said first and second controls (7', 7", 8', 8").

7. Machine as claimed in any one of the preceding claims wherein a waiting station (6) is provided between the decoiling station (5) and the coiling station (3) or between the coiling station and the tapering station.

8. Process for coiling/decoiling at least one tube (13) moving in a pre-determined direction, by means of a coiling/decoiling machine comprising bending means (8) to bend a first end of the tube (13) and guide it so as to form a coil, and a cross-shaped structure (2) defining a cross with four arms, wherein each of said arms of said cross-shaped structure is provided with coiling/decoiling means for coiling/decolling said coil, said coiling/decoiling means comprising a drum (7), said cross-shaped structure being suitable for rotating around its longitudinal axis (X), thereby moving said drum from a coiling station (3) to a decoiling station (5), said process comprising the following stages:

a) bending of the tube by means of said bending means (8) at the inlet to a coiling station (3);

b) insertion of a first end of the tube in a containing cavity (9) provided in the drum (7) in said coiling station, so as to automatically support said first end during rotation of the drum, and coiling of the tube on said drum (7);

c) a first rotation of the cross-shaped structure (2) around its longitudinal axis (X) to move said drum (7) and bending means (8) to an intermediate tapering station (4) between the coiling (3) and decoiling (5) stations, a second end of the tube being supported by said bending means (8) during said first rotation.

9. Process as claimed in claim 8, wherein said tapering station (4) provides for a tapering operation of said second end of the tube (13) by means of an automatic tapering unit (10).

10. Process as claimed in claim 9 comprising, after the tapering operation, a second rotation of the cross-shaped structure (2) around its longitudinal axis (X) to move said drum (7) and bending means (8) to the decoiling station (5), the second end of the tube being supported by said bending means (8) during said second rotation and in said decoiling station (5) the bending means (8) and the drum (7) are rotated in the coil unwinding direction in order to automatically feed the tube to traction assemblies (15) downstream.

11. Process as claimed in claim 10, wherein during unwinding of the coil, the first end of the tube is automatically supported by the containing cavity (9) of the drum (7) and by the bending means (8).

12. Process as claimed in claim 11 comprising, after the decoiling operation, a third and a fourth rotation of the cross-shaped structure (2) to move said drum (7) and bending means (8) respectively to a waiting station (6) and then to the coiling station (3) to begin a new coiling/decoiling cycle.

13. Process as claimed in claim 11 comprising, before the first rotation of the cross-shaped structure (2) around its longitudinal axis (X), a third rotation of said structure (2), to move the drum (7) and bending means (8) to a waiting station (6) and comprising, after the decoiling operation, a fourth rotation of the cross-shaped structure (2) to move the drum (7) and bending means (8) to the coiling station to begin a new coiling/decoiling cycle.

14. Process as claimed in claim 12 or 13, wherein in said tapering station (4), in said waiting station (6) and during the rotations of the cross-shaped structure (2) around its longitudinal axis (X), the bending means (8) and drum (7) are kept still by means of respective independent brakes.

Ansprüche

1. Maschine zum Aufwickeln/Abwickeln zumindest eines Rohres (13) in einer vorbestimmten Richtung, umfassend
ein Biegemittel (8), um ein erstes Ende des Rohres (13) zu biegen und dieses zu führen, um so eine Wicklung zu bilden,
einen kreuzförmigen Aufbau (2), der ein Kreuz mit vier Armen definiert, wobei jeder der Arme mit einem Mittel zum Aufwickeln/Abwickeln der Wicklung versehen ist,
eine Arbeitsstation (3, 4, 5, 6), die jedem der Arme entspricht und eine Aufwickelstation (3) und eine Abwickelstation (5) umfasst, wobei der kreuzförmige Aufbau zur Rotation um seine Längsachse (x) geeignet ist, wodurch das Aufwickel-/Abwickelmittel und das Biegemittel (8) von der Aufwickelstation (3) zu der Abwickelstation (5) bewegt werden,
wobei das Aufwickel-/Abwickelmittel eine Trommel (7) umfasst, die zum Drehen um ihre Längsachse geeignet ist und mit einem Hohlraum (9) zur Aufnahme des ersten Endes des Rohres entsprechend einem Umfangsabschnitt davon versehen ist.

2. Maschine nach Anspruch 1,
wobei eines von dem Biegemittel (8), das zum Tragen eines zweiten Endes des Rohres, das auf die Trommel (7) gewickelt ist, und zum Wirken als eine Hilfe während des Abwickelns der Wicklung geeignet ist, integral an jeder Trommel (7) fixiert ist.

3. Maschine nach Anspruch 2,
mit einer Verjüngungsstation (4) in einer Zwischenposition zwischen der Aufwickel- (3) und Abwickel- (5)-Station, die mit einer automatischen Verjüngungseinheit (10) versehen ist, um das zweite Ende des Rohres zu verjüngen, die an einem Träger (11) positioniert ist, der eine Bewegung derselben von einer Warteposition zu einer Arbeitsposition zulässt.

4. Maschine nach Anspruch 3,
wobei an der Vorderseite der automatischen Verjüngungseinheit (10) eine automatische rückziehbare Vorrichtung (12) positioniert ist, die zum Rückstellen des Durchmessers des Rohres und zum Reinigen des Inneren des Rohres vor dem Verjüngungsarbeitsgang positioniert ist.

5. Maschine nach einem der vorhergehenden Ansprüche,
wobei in der Abwickelstation (5) Traktionsbaugruppen (15) vorgesehen sind, die zur automatischen Zufuhr geeignet sind, wobei das Rohr durch die entsprechende Trommel (7) und das Biegemittel (8) abgewickelt wird.

6. Maschine nach einem der vorhergehenden Ansprüche,
wobei auf dem Niveau der Aufwickel- (3) und Abwickel- (5)-Stationen erste Steuerungen (7', 7") und zweite Steuerungen (8', 8") unabhängig voneinander zum Betrieb der Trommeln (7) bzw. des Biegemittels (8) vorgesehen sind, wobei die ersten Steuerungen (7', 7") zum Übertragen einer Rotation auf die Trommeln (7) um ihre Achsen mittels eines Kettenübertragungssystems (14) geeignet sind, und Verbindungen zum Eingriff und zum Ausrücken der ersten und zweiten Steuerungen (7', 7", 8', 8") vorgesehen sind.

7. Maschine nach einem der vorhergehenden Ansprüche,
wobei eine Wartestation (6) zwischen der Abwickelstation (5) und der Aufwickelstation (3) oder zwischen der Aufwickelstation und der Verjüngungsstation vorgesehen ist.

8. Prozess zum Aufwickeln/Abwickeln zumindest eines Rohres (13), das sich in einer vorbestimmten Richtung bewegt, mittels einer Aufwickel/Abwickelmaschine, die ein Biegemittel (8), um ein erstes Ende des Rohres (13) zu biegen und dieses zu führen, um so eine Wicklung zu bilden, und einen kreuzförmigen Aufbau (2) umfasst, der ein Kreuz mit vier Armen definiert, wobei jeder der Arme des kreuzförmigen Aufbaus mit einem Aufwickel/Abwickelmittel zum Aufwickeln/Abwickeln der Wicklung vorgesehen ist, wobei das Aufwickel/Abwickelmittel eine Trommel (7) umfasst, wobei der kreuzförmige Aufbau zur Rotation um seine Längsachse (X) geeignet ist, wodurch die Trommel von einer Aufwickelstation (3) zu einer Abwickelstation (5) bewegt wird, wobei der Prozess die folgenden Stufen umfasst:

a) Biegen des Rohres mittels des Biegemittels (8) an dem Einlass zu einer Wickelstation (3);

b) Einsetzen eines ersten Endes des Rohres in einen Aufnahmehohlraum (9), der in der Trommel (7) in der Aufwickelstation vorgesehen ist, um so das erste Ende während der Rotation der Trommel automatisch zu tragen, und Aufwickeln des Rohres auf die Trommel (7);

c) eine erste Rotation des kreuzförmigen Aufbaus (2) um seine Längsachse (X), um die Trommel (7) und das Biegemittel (8) zu einer dazwischenliegenden Verjüngungsstation (4) zwischen der Aufwickel- (3) und Abwickel- (5)-Station zu bewegen, wobei ein zweites Ende des Rohres durch das Biegemittel (8) während der ersten Rotation getragen wird.

9. Prozess nach Anspruch 8,
wobei die Verjüngungsstation (4) für einen Verjüngungsarbeitsgang des zweiten Endes des Rohres (13) mittels einer automatischen Verjüngungseinheit (10) sorgt.

10. Prozess nach Anspruch 9,
umfassend nach dem Verjüngungsarbeitsgang eine zweite Rotation des kreuzförmigen Aufbaus (2) um seine Längsachse (X), um die Trommel (7) und das Biegemittel (8) zu der Abwickelstation (5) zu bewegen, wobei das zweite Ende des Rohres durch das Biegemittel (8) während der zweiten Rotation getragen wird und in der Abwickelstation (5) das Biegemittel (8) und die Trommel (7) in der Richtung zum Abwickeln der Wicklung gedreht werden, um das Rohr automatisch zu Traktionsbaugruppen (15) stromabwärts zuzuführen.

11. Prozess nach Anspruch 10,
wobei während des Abwickelns der Wicklung das erste Ende des Rohres automatisch durch den Aufnahmehohlraum (9) der Trommel (7) und durch das Biegemittel (8) getragen wird.

12. Prozess nach Anspruch 11,
umfassend nach dem Abwickelarbeitsgang eine dritte und eine vierte Rotation des kreuzförmigen Aufbaus (2), um die Trommel (7) bzw. das Biegemittel (8) zu einer Wartestation (6) und dann zu der Aufwickelstation (3) zu bewegen, um einen neuen Aufwickel/Abwickelzyklus zu beginnen.

13. Prozess nach Anspruch 11,
umfassend vor der ersten Rotation des kreuzförmigen Aufbaus (2) um seine Längsachse (X) eine dritte Rotation des Aufbaus (2), um die Trommel (7) und das Biegemittel (8) zu einer Wartestation (6) zu bewegen, und umfassend nach dem Abwickelarbeitsgang eine vierte Rotation des kreuzförmigen Aufbaus (2), um die Trommel (7) und das Biegemittel (8) zu der Aufwickelstation zu bewegen, um einen neuen Aufwickel/Abwickelzyklus zu beginnen.

14. Prozess nach einem der Ansprüche 12 oder 13,
wobei in der Verjüngungsstation (4), in der Wartestation (6) und während der Rotationen des kreuzförmigen Aufbaus (2) um seine Längsachse (X) das Biegemittel (8) und die Trommel (7) mittels jeweiliger unabhängiger Bremsen stillgehalten werden.

Revendications

1. Machine pour bobiner/débobiner au moins un tube (13) dans une direction prédéterminée, comprenant :

des moyens de flexion (8) pour fléchir une première extrémité du tube (13) et la guider afin de former une bobine,

une structure cruciforme (2) définissant une croix avec quatre bras dans laquelle chacun desdits bras est pourvu de moyens pour bobiner/débobiner ladite bobine, un poste de travail (3, 4, 5, 6)) correspondant à chacun desdits bras et comprenant un poste de bobinage (3) et un poste de débobinage (5), ladite structure cruciforme étant appropriée pour tourner autour de son axe longitudinal (X), déplaçant ainsi lesdits moyens de bobinage/débobinage et lesdits moyens de flexion (8) du poste de bobinage (3) au poste de débobinage (5),

dans laquelle lesdits moyens de bobinage/débobinage comprennent un tambour (7), approprié pour tourner autour de son axe longitudinal, pourvu d'une cavité (9) pour contenir ladite première extrémité du tube correspondant à une partie périphérique de celle-ci.

2. Machine selon la revendication 1, dans laquelle un desdits moyens de flexion (8), approprié pour supporter une seconde extrémité du tube bobiné sur le tambour (7) et pour servir d'aide durant le déroulement de la bobine, est fixé de façon intégrée à chaque tambour (7).

3. Machine selon la revendication 2, comprenant une poste de conification (4), dans une position intermédiaire entre les postes de bobinage (3) et de débobinage (5), pourvu d'une unité de conification automatique (10) pour conifier la seconde extrémité du tube, positionnée sur un chariot (11) qui permet le mouvement de celle-ci d'une position d'attente à une position de travail.

4. Machine selon la revendication 3, dans laquelle sur l'avant l'unité de conification automatique (10) un dispositif rétractable automatique (12) est positionné, approprié pour restaurer le diamètre du tube et nettoyer l'intérieur du tube avant l'opération de conification.

5. Machine selon une quelconque des revendications précédentes, dans laquelle, dans ledit poste de débobinage (5), des ensembles de traction (15) sont prévus, appropriés pour être automatiquement alimentés en tube débobiné par le tambour (7) et les moyens de flexion (8) correspondants.

6. Machine selon une quelconque des revendications précédentes, dans laquelle au niveau desdits postes de bobinage (3) et de débobinage (5), des premières commandes (7', 7") et des secondes commandes (8', 8") sont prévues, indépendantes les unes des autres, pour actionner les tambours (7) et les moyens de flexion (8) respectivement, lesdites premières commandes (7', 7") étant appropriées pour transmettre une rotation aux tambours (7) autour de leurs axes au moyen d'un système de transmission par chaîne (14), et des joints sont prévus pour mettre en prise et séparer lesdites premières et secondes commandes (7', 7", 8', 8").

7. Machine selon une quelconque des revendications précédentes, dans laquelle un poste d'attente (6) est prévu entre le poste de débobinage (5) et le poste de bobinage (3) ou entre le poste de bobinage et le poste de conification.

8. Procédé pour bobiner/débobiner au moins un tube (13) se déplaçant dans une direction prédéterminée, au moyen d'une machine de bobinage/débobinage comprenant des moyens de flexion (8) pour fléchir une première extrémité du tube (13) et la guider afin de former une bobine, et une structure cruciforme (2) définissant une croix avec quatre bras, dans lequel chacun desdits bras de ladite structure cruciforme est pourvu de moyens de bobinage/débobinage pour bobiner/débobiner ladite bobine, lesdits moyens de bobinage/débobinage comprenant un tambour (7), ladite structure cruciforme étant appropriée pour tourner autour de son axe longitudinal (X), déplaçant ainsi ledit tambour d'un poste de bobinage (3) à un poste de débobinage (5), ledit procédé comprenant les étapes suivantes :

a) la flexion du tube au moyen desdits moyens de flexion (8) à l'entrée d'un poste de bobinage (3);

b) l'insertion d'une première extrémité du tube dans une cavité de confinement (9) prévue dans le tambour (7) dans ledit poste de bobinage, afin de supporter automatiquement ladite première extrémité durant la rotation du tambour, et le bobinage du tube sur ledit tambour (7);

c) une première rotation de la structure cruciforme (2) autour de son axe longitudinal (X) pour déplacer ledit tambour (7) et lesdits moyens de flexion (8) jusqu'à un poste de conification intermédiaire (4) entre les postes de bobinage (3) et de débobinage (5), une seconde extrémité du tube étant supportée par lesdits moyens de flexion (8) durant ladite première rotation.

9. Procédé selon la revendication 8, dans lequel ledit poste de conification (4) fournit une opération de conification de ladite seconde extrémité du tube (13) au moyen d'une unité de conification automatique (10).

10. Procédé selon la revendication 9 comprenant, après l'opération de conification, une deuxième rotation de la structure cruciforme (2) autour de son axe longitudinal (X) pour déplacer ledit tambour (7) et lesdits moyens de flexion (8) jusqu'au poste de débobinage (5), la seconde extrémité du tube étant supportée par lesdits moyens de flexion (8) durant ladite deuxième rotation et, dans ledit poste de débobinage (5), les moyens de flexion (8) et le tambour (7) sont tournés dans le sens de déroulement de bobine afin de distribuer automatiquement le tube à des ensembles de traction (15) en aval.

11. Procédé selon la revendication 10, dans lequel, durant le déroulement de la bobine, la première extrémité du tube est automatiquement supportée par la cavité de confinement (9) du tambour (7) et par les moyens de flexion (8).

12. Procédé selon la revendication 11 comprenant, après l'opération de débobinage, des troisième et quatrième rotations de la structure cruciforme (2) pour déplacer ledit tambour (7) et lesdits moyens de flexion (8) respectivement jusqu'à un poste d'attente (6) et puis jusqu'au poste de bobinage (3) pour commencer un nouveau cycle de bobinage/débobinage.

13. Procédé selon la revendication 11 comprenant, avant la première rotation de la structure cruciforme (2) autour de son axe longitudinal (X), une troisième rotation de ladite structure (2) pour déplacer le tambour (7) et les moyens de flexion (8) jusqu'à un poste d'attente (6) et comprenant, après l'opération de débobinage, une quatrième rotation de la structure cruciforme (2) pour déplacer le tambour (7) et les moyens de flexion (8) jusqu'au poste de bobinage pour commencer un nouveau cycle de bobinage/débobinage.

14. Procédé selon la revendication 12 ou 13, dans lequel, dans ledit poste de conification (4), dans ledit poste d'attente (6) et durant les rotations de la structure cruciforme (2) autour de son axe longitudinal (X), les moyens de flexion (8) et le tambour (7) sont maintenus immobiles au moyen de freins indépendants respectifs.

Drawing