DEVICE AND METHOD FOR JOINING TEXTILE YARNS

Description

FIELD OF THE INVENTION

[0001] The present invention concerns a device, and the relative method, for joining textile yarns, formed by a set of fibers twisted together.

[0002] In the device according to the invention the various devices for clamping the ends, cutting the tails, stretching, the de-twisting and re-twisting of the parts of the yarn to be joined, and also the elements of the pneumatic joining chamber, are individually driven by their own, distinct actuation means, able to be commanded independently and individually regulated, by an electronic unit, according to pre-set and pre-settable parameters and values.

[0003] The electronic unit, according to the characteristics of the yarn, the type of use of the yarn, the environmental conditions and the signals arriving from appropriate sensors, is suitable to send command signals to each of the actuation means so as to perform the sequence of various operations to join the yarns.

BACKGROUND OF THE INVENTION

[0004] When joining textile yarns, it is possible to distinguish strictly technological steps, wherein operations are performed directly on the fibers that make up the yarn, and auxiliary steps that serve mainly to correctly position the yarns so that the various operations are correct.

[0005] A first type of joining device consists of pneumatic devices which uses the action of a fluid, normally air, on the fibers which make up the ends of the yarns to be joined. Normally, in the initial steps such devices act on two yarns so as to obtain, by means of scissors or pincer, two ends of a defined length and conformation, called tails. Subsequently, the two ends of the yarns to be joined are hit by a jet of compressed air so as to eliminate the residual twists, trying to make the fibers parallel and to reduce the quantity of the fibers affected by the join.

[0006] The techniques used to achieve this action are various, such as jets inclined with respect to the yarn, rotary jets, pulsating jets and other. When the preparation step is finished, the tails are inserted in a proper joining chamber, wherein a second jet of air penetrates the fibers giving mechanical resistance and, thanks to the geometric conformation of the chamber, closes the fibers together so as to give the join a good aesthetic appearance. With such devices it is extremely difficult to obtain joins which have both good mechanical characteristics and also good aesthetic characteristics; in fact, these characteristics depend on the geometric configuration of the pneumatic chamber and therefore it is often necessary to use a chamber which covers a sufficient range of yarns and guarantees a good compromise between the two requirements.

[0007] Mainly mechanical devices are also known, which directly use the mechanical action on the fibers that make up the ends of the yarns to be joined. By means of a first mechanical action, called de-twisting, on the two ends of the yarns to be joined, a central zone is obtained wherein the fibers are practically parallel and hence without mechanical resistance. At this point the excess parts are torn off or cut, so as to obtain two tails of the desired length with parallel fibers. The tails are superimposed and then by means of a second mechanical action, or twist, opposite the first, the structure of the original yarn is reconstructed. With such devices joins are obtained with optimum aesthetic characteristics, but the absence of the penetration step leads to a lack of mechanical resistance, especially to abrasion.

[0008] Another type of devices are the mixed pneumatic-mechanical devices, such as for example as described in DE-A1-3131986 and in EP-A-0 227 370, wherein first of all the mechanical action is used to de-twist the yarns and obtain segments of yarn with parallel fibers, then the fibers are penetrated by means of a jet of fluid, and finally a mechanical action is again performed in order to re-twist the fibers and regenerate the structure of the yarn. Such devices have not had a wide diffusion, despite the excellent results from both the point of view of aesthetics and of mechanical resistance, due to the great mechanical complexity in the industrial production. In fact, to have the possibility of adapting to the different types of yarns, it would be necessary to be able to vary the number of mechanical de-twistings and/or re-twistings and the step and/or duration of blowing in the pneumatic chamber. Given the configuration of the components and the relative drive systems, this known device requires an at least partial replacement of the components and/or their mechanical re-adaptation every time the type and/or number of yarns is changed, which makes the device uneconomical.

[0009] The purpose of the invention is therefore to achieve a device and a method for joining textile yarns which allow to obtain the desired technological results for a wide range of yarns, both in type and count, without increasing the complexity of the device and obviating the limits of known devices as mentioned above.

[0010] The Applicant has devised and embodied this invention to overcome the shortcomings of the state of the art and to obtain other advantages.

SUMMARY OF THE INVENTION

[0011] The present invention is set forth and characterized in the main claims, while the dependent claims describe other innovative characteristics of the invention and variants to the main inventive idea.

[0012] A joining device for textile yarns according to the invention is of the mixed, pneumatic-mechanical type and comprises, as its main components, a pneumatic chamber, or joining chamber, means to grip the ends of the yarns, de-twisting means and re-twisting means cooperating with said gripping means, stretching means and cutting means.

[0013] According to a characteristic feature of the invention, the components of the device indicated above are mechanically independent with respect to each other, at least from the functional and operational point of view, and can be activated independently, both in entity of movement and in step, by means of relative and distinct actuation means, on the commands of an electronic control unit, according to the program, the work parameters and the signals arriving from the sensors used.

[0014] This independence of action allows to obtain a substantially universal joining device for yarns without needing to modify it mechanically or to apply particular accessories.

[0015] In fact, by setting the electronic unit, it is possible to modify on each occasion the actuation parameters of the individual components, adapting them specifically to the requirements of the operating cycle in progress, so as to be able to regulate the operations of the device according to the characteristics of the yarn to be joined.

[0016] In this way we obtain an extremely versatile and flexible device, economical and able to operate substantially on any type of yarn without entailing the problems of modifications and reconfiguration.

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] These and other characteristics of the present invention will become apparent from the following description of a preferential form of embodiment, given as a non-restrictive example with reference to the attached drawings wherein:

• fig. 1 is a schematic overall view of the joining device for textile yarns according to the invention;
• fig. 2 shows an enlarged detail of the device in fig. 1;
• figs. 3a, 3b and 3c show an operating sequence of the joining cycle performed by the device in fig. 1;
• figs. 4a, 4b and 4c show three embodiments of the rotary pincers which perform the de-twisting and re-twisting of the yarn;
• fig. 5 shows an enlarged detail of fig. 4b;
• fig. 6 is a block diagram of the method for joining textile yarns according to the invention.

DETAILED DESCRIPTION OF A PREFERENTIAL EMBODIMENT

[0018] With reference to the attached drawings, the reference number 10 denotes generally a joining device for textile yarns, indicated by 16a and 16b in figs. 3a, 3b, 3c, according to a preferential embodiment of the present invention.

[0019] The device 10 comprises a pneumatic joining chamber 13, able to be selectively opened and closed, inside which the ends of the yarns 16a, 16b to be joined are introduced. The pneumatic joining chamber 13 cooperates with respective gripping means 20 to grip the ends of the yarns 16a, 16b, suitable to perform at least some of the following functions:

• twist-stopper;
• clamping the relative yarn 16a or 16b so that, during the de-twisting step before the join is made, and the re-twisting step after the join is made, the twists are concentrated in the segment of yarn involved in the join;
• stretching;
• reducing the quantity of fibers that will form the join;
• tearing the tails;
• super extension of the parts of the yarn in excess, so as to obtain two segments of yarn with a length and quantity of controlled fibers, called tails.

[0020] The gripping means 20 are located immediately outside the pneumatic chamber 13 and comprise a first and a second pincer arranged on opposite sides of the chamber 13, one (21a) above and the other (21b) below said joining chamber 13. Each of the pincers 21a, 21b acts on one of the two ends of the yarns 16a, 16b to be joined and particularly on the relative segments of free yarn.

[0021] Each pincer 21a, 21b is mounted on a relative screw 11 made to rotate by an electric motor 12. Taking the screw 11 in correspondence with a first position of rear end-of-travel, indicated by A in fig. 3, the pincers 21a, 21b open and are ready to receive the relative yarn 16a, 16b.

[0022] Commanding a suitable number of revolutions to the relative electric motor 12, the pincers 21a, 21b close, clamping inside them the relative yarn 16a, 16b. In this step, (position B, fig. 3b) the pincers 21a, 21b perform a stretching action on the relative yarn 16a, 16b of a quantity proportional to the number of revolutions imparted to the relative motors 12. The entity of the stretching can be equal in the two yarns 16a, 16b, or also reciprocally different.

[0023] By activating the motors 12 again until the relative screw 11 is taken to a second, front end-of-travel position (position C, fig. 3c), the function of tearing the tails is performed.

[0024] The device 10 also comprises cutting means consisting of scissors 22 to cut the yarn, which can be sued, for particularly resistant yarns or yarns with an elastic core, so as to guarantee the interruption of the yarn.

[0025] The scissors 22 are activated by feeding a pneumatic piston by means of a control electro-valve 23.

[0026] The pneumatic joining chamber 13 is a device in which the function of penetration of the fibers is performed. The chamber 13 is formed by two separate movable shells, respectively 30 and 31 (figs. 2, 3a), at least one of which, in this case the shell 30, is equipped with a series of holes 32, advantageously with an axis perpendicular to the axis of the yarns 16a, 16b, from which pressurized fluid is made to exit, on the command of an electro-valve.

[0027] The two shells 30, 31 are moved apart/closer from/to each other, advantageously by means of a pneumatic piston. They can thus assume a first, reciprocally distanced position (position D, fig. 3a) wherein the joining chamber 13 is open and the yarns 16a, 16b can be introduced inside it, the ends of the yarns being retained by the respective pincers 21a, 21b.

[0028] Once the yarns 16a, 16b are located inside the joining chamber 13, the two shells 30, 31 are taken into contact with each other (position E, fig. 3b) and the joining chamber 13 is closed in sealed manner.

[0029] After having suitably prepared the two ends of the yarns 16a, 16b, the joining chamber 13 is closed and then, for a pre-set time, a command electro-valve is activated so that the fluid is introduced into the chamber 13 through the hole 32, and hits the fibers. The shape of the joining chamber 13 is advantageously such that the jet of fluid creates a vortex such that the fibers are bound together, creating a joining point between the two ends.

[0030] The duration of the delivery of the jet of air to the yarns is defined by an electronic control unit 15 according to the characteristics of the yarn, the type of use of the yarn and the environmental conditions. The electronic control unit 15 is also suitable to drive the motors 12 of the pincers 21a, 21b according to the steps of the cycle and the entity of stretching to be imparted to the relative yarns 16a, 16b, the pneumatic piston that opens and closes the shells 30, 31 of the joining chamber 13, and, as we shall see hereafter, the members that drive the rotary pincers 14a, 14b of the scissors 22 and the members involved in the joining cycle.

[0031] The joining chamber 13, in one and/or the other of the shells 30, 31, can be equipped with devices to clamp the yarns, which are particularly useful in the case of elasticized yarns. In this case, one or more pins 33, commanded pneumatically, can be selectively driven, on the command of the electronic control unit 15, to clamp the yarns 16a, 16b in the joining zone, preventing the elastic core of the yarn from retracting excessively and from escaping from the join.

[0032] The device 10, according to a first variant, can be equipped with auxiliary components, selectively driven, to vary the delivery, pressure and temperature of the fluid injected. The auxiliary components are piloted by the control unit 15 according to the characteristics of the yarn, the type of use of the yarn and the environmental conditions.

[0033] According to another variant, the device 10 is equipped with auxiliary components able to allow to inject into the joining chamber 13 a mixture of air and water, to a percentage modifiable by the control unit 15, according to the characteristics of the yarn, the type of use of the yarn and the environmental conditions.

[0034] The device 10 also comprises, as said above, a first 14a and a second 14b rotary pincers, suitable for the de-twisting and re-twisting of the respective yarns 16a, 16b.

[0035] The rotary pincers 14a, 14b allow to impart to the relative yarns 16a, 16b a controllable number of rotations around their own axis. They are located immediately outside the pneumatic joining chamber 13, on opposite sides thereof, and each of them cooperates with a relative yarn-clamping pincer 21a, 21b. Each rotary pincer 14a, 14b acts on one of the two ends of the yarns 16a, 16b to be joined, and particularly on the segment of integral yarn.

[0036] Figs. 4a, 4b, 4c show three embodiments of the rotary pincers 14a, 14b.

[0037] In fig. 4a, the rotary pincer 14a, 14b is of the type with an eyelet 50 housing the relative yarn 16a, 16b and is made on a first gear 40 drawn by a second gear 140 solid with the shaft of an electric motor.

[0038] In fig. 4b too, the rotary pincer 14a, 14b has an eyelet 50 housing the relative yarn 16a, 16b and is mounted on a disk wherein magnets 41 are incorporated, whereas on the fixed outer part electric coils 42 are housed. By suitably feeding the coils 42 the controlled rotation of the pincer is commanded, according to commands imparted by the electronic control unit 15.

[0039] In the embodiment shown in 4c, the pincer 14a, 14b again has the eyelet 50 housing the relative yarn and is mounted on a small pneumatic turbine 43. The clockwise/anti-clockwise rotation of the rotary pincer 14a, 14b occurs by activating suitable jets of air, for example 44 for clockwise rotation and 45 for anticlockwise rotation.

[0040] The angular position of each of the rotary pincers 14a, 14b is controlled by a sensor 46 (fig. 5) which provides a suitable electric signal when a clamping pin 47, associated with a movement coil 48, has been taken to a position such as to allow the introduction of the yarns 16a, 16b.

[0041] Once the rotary pincer 14a, 14b has been clamped in the desired position, the pincer is opened by feeding the coil 48 which attracts the pin 47.

[0042] The electric signal supplied by the sensor 46 allows the electronic control unit 15 to measure the number of revolutions performed by the pincer 14a, 14b.

[0043] The electronic control unit 15 advantageously consists of an electronic card with a microprocessor in which the functions of processing, piloting the electric motors, commanding the electro-valves and reading the various sensors are integrated.

[0044] According to the memorized program of a series of parameters connected to the characteristics of the yarn, the join to be obtained and the environmental conditions, the electronic control unit 15 performs a sequence of operations on the yarn. This sequence can be modified according to the signals arriving from some sensors so as to adapt to the new working conditions.

[0045] We shall now describe a complete joining cycle performed by the device 10 as described heretofore, as shown in the block diagram in fig. 6.

First step - Introduction and clamping of the yarns: each yarn 16a, 16b is introduced inside the device 10 and clamped at the two ends by the corresponding end-clamping pincer 21a, 21b and the corresponding rotary pincer 14a, 14b. At the end of this operation the four pincers, two fixed 21a, 21b and two rotary 14a, 14b, isolate the segments of yarn outside the device 10 from those inside it, on which the subsequent operations will act.

Second step - De-twisting of the yarns: the electronic control unit 15 commands the rotary pincers 14a, 14b to rotate. The number of revolutions and the direction of rotation are connected to the characteristics of the yarn and are such as to obtain the annulment of the twists in proximity with the end-clamping pincer 21a, 21b.

Third step - Closure of the joining chamber: the control unit 15 commands the pneumatic joining chamber 13 to close, by activating the appropriate electro-valve.

Fourth step - Stretching of the yarns: the control unit 15 commands the end-clamping pincers 21a, 21b to move by means of a controlled drive of the relative motors 12. The entity of the linear movement of the pincers 21a, 21b is connected to the characteristics of the yarn: the greater the entity of the stretching, the smaller the quantity of fibers involved in the join.

Fifth step - Clamping of the central part of the yarns: the control unit 15 activates the electro-valve that commands the outlet of the central block, so as to prevent the possible elastic core of the yarn from retracting excessively in the subsequent tearing step.

Sixth step - Tearing: the control unit 15 commands the end-clamping pincers 21a, 21b to move, until the travel is complete. The two ends of the yarn to be eliminated are thus caused to tear by means of suction.

Seventh step - Scissor cut: to guarantee the discharge of the two segments of yarn to be eliminated, the control unit 15 activates the two scissors 22.

Eighth step - Joining blow: the control unit 15 commands the jet of fluid inside the joining chamber 13. The duration of the jet depends on the characteristics of the yarn and the parameters set. The direction of blowing is such that the fluid not only acts on the fibers of the yarn, making them penetrate each other, but also takes the pistons of the central block into the inactive position.

Ninth step - Re-twisting of the yarns: the control unit 15 commands the rotary pincers 14a, 14b to rotate in the opposite direction with respect to the direction of the second step: The number of revolutions depends on the characteristics of the yarn and the parameters set.

Tenth step - Cycle completed: the control unit 15 commands the shells 30, 31 of the pneumatic joining chamber 13 to open, then the rotary pincers 14a, 14b are released and finally the end-clamping pincers 21a, 21b return to their position.

[0046] As an auxiliary step, the control unit 15, according to the parameters set, can activate a function to control the join.

[0047] This step can provide the activation of various control algorithms: a test every N cycles, random distribution, upon specific request of the operator.

[0048] According to another variant, a force sensor can be provided, located on at least one of the pincers 21a, 21b that clamp one end of the join, in order to measure the tension of the yarn. If the function to test resistance and stretching is active, the control unit 15 reads the value supplied by the force sensor and processes it to determine the breaking load of the join.

[0049] According to another variant, a movable pincer can be provided which clamps the other end of the join if the function to test resistance and stretching is active. The control unit 15, in this case, is therefore suitable to command the movement of the movable pincer so as to put the join in traction until it breaks.

[0050] In this variant form, when the join cycle is complete, a pincer equipped with the load cell and the end-clamping pincer are activated, and in this way the join remains clamped inside the two pincers.

[0051] The control unit 15 then commands the movable pincer to move, so as to put the join in traction, and at the same time memorizes the values supplied by the load cell. At the moment the join breaks, the value read by the load cell is practically zeroed.

[0052] The control unit 15 processes the data memorized and supplies the values of the breaking load and stretching of the join. Should these values not satisfy the required levels, the control unit 15 signals a malfunction of the device 10. The operator can set the device 10 so that this event causes it to stop, to avoid producing joins not in conformity with the required standards. Or, if the values obtained, while not optimum, are considered sufficient to continue functioning, the condition is only signaled, so that a maintenance and/or cleaning operation can be programmed.

Claims

1. Device for joining textile yarns (16a, 16b), including a joining chamber (13) inside which the ends of two yarns (16a, 16b) to be joined are able to be introduced, said joining chamber (13) being able to be closed and defining, in its closed position, a joining compartment able to be hit by a jet of fluid in order to obtain the join, said device comprising, for each of the yarns (16a, 16b), first clamping means (21a, 21b) to clamp the ends of the yarn (16a, 16b), second gripping means (14a, 14b) rotating substantially around the axis of the relative yarn (16a, 16b) in order to perform the de-twisting and re-twisting of the yarn (16a, 16b), and cutting means (22), characterized in that said joining chamber (13), said clamping means (21a, 21b) to clamp the ends of the yarns (16a, 16b) and said rotating gripping means (14a, 14b), de-twisting and twisting, are able to be driven by respective and independent drive means governed by the commands of an electronic control unit (15), wherein said electronic control unit (15) is able to regulate at least the starting moment, the flow rate and/or the duration of delivery of the jet of said fluid on the yarns according to at least one between the characteristics of the yarn, the type of use of the yarn and the environmental conditions, wherein each of said rotating gripping means (14a, 14b) is able to impart to the end of the respective yarn (16a, 16b) a controllable number of rotations around their own axis for their de-twisting and re-twisting, and wherein said clamping means comprise two pincers, one (21a) above and the other (21b) below said joining chamber (13), each of said pincers (21a, 21b) acting on one of the two ends of said yarns (16a, 16b) to be joined and being mounted on a relative screw (11) made to rotate by a respective motor (12), wherein each of said motors (12) is able to move the respective pincer (21a, 21b) in order to perform a stretching action on the relative yarn (16a, 16b) of a quantity proportional to the number of revolutions imparted to the relative motors (12), wherein the entity of stretching can be either equal or reciprocally different in the two yarns (16a, 16b).

2. Device as in claim 1, characterized in that said electronic control unit (15) is able to command the drive of said motors (12) in order to move said pincer means (21a, 21b) from a first position (A) wherein said pincer means open and are ready to receive the relative yarn (16a, 16b), a second position (B) wherein the pincer means (21a, 21b) close, clamping inside them the relative yarn (16a, 16b), and a third position (C), wherein the function of tearing the tails is obtained.

3. Device as in any claim hereinbefore, characterized in that said joining chamber (13) is formed by two movable shells (30, 31), at least one of which is equipped with holes (32) from which pressurized fluid is made to emerge, upon the command of an electro-valve.

4. Device as in claim 3, characterized in that said shells (30, 31) are able to be moved away from/towards each other, in order to assume a first reciprocally distanced position, wherein said joining chamber (13) is open and the ends of said yarns (16a, 16b), held by the respective pincer means (21a, 21b), are able to be introduced inside, and a second position of reciprocal contact, wherein the joining chamber (13) is closed in sealed manner for the introduction of said fluid inside, through said holes (32), so as to hit the fibers and achieve the join.

5. Device as in claim 3, characterized in that said joining chamber (13) is shaped so that the jet of fluid creates a vortex such that the fibers are bound together, creating a joining point between the two ends.

6. Device as in claim 3, characterized in that said joining chamber (13), in one and/or the other of said shells (30, 31) includes means (33) able to be selectively activated in order to clamp the yarns (16a, 16b) inside said joining compartment, particularly in the case of elasticized yarns.

7. Device as in any claim hereinbefore, characterized in that said electronic control unit (15) is able to regulate the direction of rotation and the number of rotations of said rotary pincers (14a, 14b) which perform the de-twisting and re-twisting of the yarns (16a, 16b) according to the characteristics of the yarn, the type of use of the yarn and the environmental conditions.

8. Device as in any claim hereinbefore, characterized in that in the step of de-twisting the number of revolutions and the direction of rotation are connected to the characteristics of the yarn in order to obtain the annulment of the twists in proximity with the end-clamping pincer (21a, 21b).

9. Device as in claim 7, characterized in that each of said rotary pincer (14a, 14b) has an eyelet (50) housing the relative yarn (16a, 16b), wherein the angular position of said rotary pincers (14a, 14b) is controlled by a sensor (46) which provides a suitable electric signal when a clamping pin (47) has been taken to a position such as to allow the introduction of said yarns (16a, 16b).

10. Device as in any claim hereinbefore, characterized in that it comprises means, able to be driven by said electronic control unit (15), to selectively vary the flow rate, the pressure and the temperature of the fluid injected inside said joining chamber (13).

11. Device as in any claim hereinbefore, characterized in that it comprises means, able to be driven by said electronic control unit (15), to inject into said joining chamber (13) a mixture of air and water in an adjustable percentage according to the characteristics of the yarn, the type of use of the yarn and the environmental conditions.

12. Device as in claim 2, characterized in that said control unit (15) is able to determine the selective activation of said pincer means (21a, 21b) in order to regulate the starting moment when the stretching of the two segments of yarn (16a, 16b) is performed, according to the characteristics of the yarn, the type of use of the yarn and the environmental conditions.

13. Device as in claim 2, characterized in that said control unit (15) is able to determine the selective activation of said pincer means (21a, 21b) in order to regulate the moment when the tearing of the two free ends of yarn is commanded according to the characteristics of the yarn, the type of use of the yarn and the environmental conditions.

14. Device as in any claim hereinbefore, characterized in that said control unit (15) is able to determine the selective activation of cutting means (22) in temporal correlation at least with the pincer means (21a, 21b) that grip the ends of the yarns and with the rotary pincer means (14a, 14b) according to the characteristics of the yarn, the type of use of the yarn and the environmental conditions.

15. Device as in claim 1, characterized in that said rotary pincer means (14a, 14b) are able to be driven by an electric motor (12) governed by the commands of said control unit (15).

16. Device as in claim 1, characterized in that said rotary pincer means (14a, 14b) are able to be driven by pneumatic turbine means (43) governed by the commands of said control unit (15).

17. Device as in claim 1, characterized in that said rotary pincer means (14a, 14b) are able to be driven by electric coil means (42) cooperating with magnets (41) and whose drive is governed by the commands of said control unit (15).

18. Device as in claim 1, characterized in that on at least one of said clamping means (21a, 21b) that grip the ends of the yarns (16a, 16b) there are sensor means present able to perform a test of resistance and stretching on the join just made.

19. Device as in claim 18, characterized in that said sensor means comprise at least a load cell.

20. Method for joining textile yarns (16a, 16b), in a joining device (10) as in any claim hereinbefore, characterized in that it comprises, in sequence, at least the following steps:

- a step of introducing the yarns (16a, 16b) inside the device (10) and clamping their ends by the corresponding pincer means (21a, 21b) and the corresponding rotary pincer means (14a, 14b);

- a step of de-twisting the yarns, wherein the electronic control unit (15) commands the rotary pincer means (14a, 14b) to rotate, with a number of revolutions and a direction of rotation correlated to the characteristics of the yarn;

- a step of closing said joining chamber (13);

- a step wherein said control unit (15) commands said pincers means (21a, 21b) to move, by means of a controlled drive of the relative motors (12), in order to stretch the yarns (16a, 16b) clamped by the rotary pincers (14a, 14b), wherein the entity of the linear movement of the pincers means (21a, 21b) is connected to the characteristics of the yarn in order to regulate in a corresponding manner the entity of the stretching imparted;

- a step wherein said control unit (15) commands the pincers means (21a, 21b) to move until the travel is complete so that the two ends of the yarn (16a, 16b) to be eliminated are caused to tear by means of suction;

- a step wherein said control unit (15) activates the cutting means (22) to guarantee the discharge of the two segments of yarn to be eliminated;

- a step wherein said control unit (15) commands the jet of fluid inside the joining chamber (13), wherein the starting moment, the flow rate and the duration of the jet are a function of the characteristics of the yarn and the parameters set;

- a step of re-twisting of the yarns (16a, 16b), wherein said control unit (15) commands the rotary pincers (14a, 14b) to rotate in the opposite direction with respect to the direction adopted during de-twisting, wherein the number of revolutions of said rotary pincers (14a, 14b) is a function of the characteristics of the yarn and the parameters set;

- a cycle completion step, wherein said control unit (15) commands the shells (30, 31) of said joining chamber (13) to open, then said rotary pincers (14a, 14b) are released and finally the end-clamping pincers (21a, 21b) return to their position.

Ansprüche

1. Vorrichtung zum Verbinden von Textilgarnen (16a, 16b), aufweisend eine Verbindungskammer (13), in die die Enden von zwei zu verbindenden Garnen (16a, 16b) eingeführt werden können, wobei die Verbindungskammer (13) geschlossen werden kann und in ihrer Schließposition ein Verbindungsfach definiert, das geeignet ist, von einem Flüssigkeitsstrahl zum Erhalten der Verbindung getroffen zu werden, wobei die Vorrichtung für jedes der Garne (16a, 16b) aufweist: erste Klemm-Mittel (21a, 21b) zum Festklemmen der Enden des Garns (16a, 16b), zweite Greifmittel (14a, 14b), die sich im Wesentlichen um die Achse des jeweiligen Garns (16a, 16b) drehen zum Durchführen des Entdrehens und erneuten Verdrehens des Garns (16a, 16b), und Schneidemittel (22), dadurch gekennzeichnet, dass die Verbindungskammer (13), die Klemm-Mittel (21a, 21b) zum Festklemmen der Enden der Garne (16a, 16b) und die sich drehenden Greifmittel (14a, 14b), die entdrehen und verdrehen, geeignet sind, von jeweiligen und unabhängigen Antriebsmitteln angetrieben zu werden, die von den Befehlen einer elektronischen Steuereinheit (15) gesteuert werden, wobei die elektronische Steuereinheit (15) zum Regulieren mindestens des Startmoments, der Durchflussrate und/oder der Dauer der Abgabe des Flüssigkeitsstrahls auf die Garne gemäß mindestens einer aus den Eigenschaften des Garns, der Art der Verwendung des Garns und den Umweltbedingungen geeignet ist, wobei jedes der sich drehenden Greifmittel (14a, 14b) geeignet ist, dem Ende des jeweiligen Garns (16a, 16b) eine steuerbare Anzahl von Drehungen um dessen eigene Achse zum Entdrehen und erneuten Verdrehen desselben zu vermitteln, und wobei die Klemm-Mittel zwei Zangen aufweisen, eine (21a) über und die andere (21b) unter der Verbindungskammer (13), wobei jede der Zangen (21a, 21b) auf eines der beiden Enden der zu verbindenden Garne (16a, 16b) einwirkt und an einer jeweiligen Schraube (11) montiert ist, die von einem jeweiligen Motor (12) zum Drehen gebracht wird, wobei jeder der Motoren (12) zum Bewegen der jeweiligen Zange (21a, 21b) zum Durchführen eines Streckvorgangs an dem jeweiligen Garn (16a, 16b) in einer Größe geeignet ist, die proportional ist zu der dem jeweiligen Motor (12) vermittelten Anzahl von Umdrehungen, wobei die Größe der Streckung in den beiden Garnen (16a, 16b) gleich oder wechselseitig unterschiedlich sein kann.

2. Vorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass die elektronische Steuereinheit (15) zum Steuern des Antriebs der Motoren (12) geeignet ist für ein Bewegen der Zangenmittel (21a, 21b) aus einer ersten Position (A), in der die Zangenmittel (21a, 21b) sich öffnen und zum Aufnehmen des jeweiligen Garns (16a, 16b) bereit sind, einer zweiten Position (B), in der sich die Zangenmittel (21a, 21b) schließen, wobei sie das jeweilige Garn (16a, 16b) zwischen einander einklemmen, und einer dritten Position (C), in der die Funktion des Abreißens der Enden erreicht wird.

3. Vorrichtung gemäß einem vorhergehenden Anspruch, dadurch gekennzeichnet, dass die Verbindungskammer (13) aus zwei bewegbaren Schalen (30, 31) gebildet ist, wobei mindestens eine davon mit Löchern (32) versehen ist, aus denen auf Befehl eines Elektroventils unter Druck stehende Flüssigkeit zum Austreten gebracht wird.

4. Vorrichtung gemäß Anspruch 3, dadurch gekennzeichnet, dass die Schalen (30, 31) geeignet sind, voneinander weg/aufeinander zu bewegt zu werden, um eine erste Position im Abstand voneinander, in der die Verbindungskammer (13) offen ist und die Enden der Garne (16a, 16b), die von den jeweiligen Zangenmitteln (21a, 21b) gehalten werden, eingeführt werden können, und eine zweite Position in gegenseitigem Kontakt einzunehmen, in der die Verbindungskammer (13) dicht verschlossen ist zum Einführen des Fluids durch die Löcher (32) nach innen, so dass es die Fasern trifft und die Verbindung herbeigeführt wird.

5. Vorrichtung gemäß Anspruch 3, dadurch gekennzeichnet, dass die Verbindungskammer (13) derart geformt ist, dass der Flüssigkeitsstrahl einen Strudel bildet, so dass die Fasern miteinander verbunden werden, eine Verbindungsstelle zwischen den beiden Enden bilden.

6. Vorrichtung gemäß Anspruch 3, dadurch gekennzeichnet, dass die Verbindungskammer (13) in einer und/oder der anderen der Schalen (30, 31) Mittel (33) aufweist, die wahlweise aktiviert werden können zum Festklemmen der Garne (16a, 16b) in dem Verbindungsfach, insbesondere im Fall von elastischen Garnen.

7. Vorrichtung gemäß einem vorhergehenden Anspruch, dadurch gekennzeichnet, dass die elektronische Steuereinheit (15) zum Regulieren der Drehrichtung und der Anzahl von Drehungen der Drehzangen (14a, 14b) geeignet ist, die das Entdrehen und das erneute Verdrehen der Garne (16a, 16b) gemäß den Eigenschaften des Garns, der Art der Verwendung des Garns und den Umweltbedingungen durchführen.

8. Vorrichtung gemäß einem vorhergehenden Anspruch, dadurch gekennzeichnet, dass in dem Schritt des Entdrehens die Anzahl von Umdrehungen und die Richtung der Drehung mit den Eigenschaften des Garns verknüpft sind zum Erzielen der Aufhebung der Drehungen in der Nähe der End-Klemm-Zangen (21a, 21b).

9. Vorrichtung gemäß Anspruch 7, dadurch gekennzeichnet, dass jede der Drehzahngen (14a, 14b) eine Öse (50) aufweist, die das jeweilige Garn (16a, 16b) aufnimmt, wobei die Winkelposition der Drehzangen (14a, 14b) durch einen Sensor (46) gesteuert wird, der ein passendes elektrisches Signal bereitstellt, wenn ein Klemmstift (47) in eine derartige Position gebracht wurde, dass das Einführen der Garne (16a, 16b) ermöglicht wird.

10. Vorrichtung gemäß einem vorhergehenden Anspruch, dadurch gekennzeichnet, dass sie Mittel aufweist, die geeignet sind, von der elektronischen Steuereinheit (15) angetrieben zu werden, um die Durchflussrate, den Druck und die Temperatur der Flüssigkeit, die in die Verbindungskammer (13) injiziert wird, selektiv zu variieren.

11. Vorrichtung gemäß einem vorhergehenden Anspruch, dadurch gekennzeichnet, dass sie Mittel aufweist, die geeignet sind, von der elektronischen Steuereinheit (15) angetrieben zu werden, um eine Mischung von Luft und Wasser in die Verbindungskammer (13) in einem regulierbaren Verhältnis gemäß den Eigenschaften des Garns, der Art der Verwendung des Garns und den Umweltbedingungen zu injizieren.

12. Vorrichtung gemäß Anspruch 2, dadurch gekennzeichnet, dass die Steuereinheit die wahlweise Aktivierung der Zangenmittel (21a, 21b) bestimmen kann zum Einstellen des Startmoments, wenn das Strecken der beiden Garnsegmente (16a, 16b) erfolgt, gemäß den Eigenschaften des Garns, der Art der Verwendung des Garns und den Umweltbedingungen.

13. Vorrichtung gemäß Anspruch 2, dadurch gekennzeichnet, dass die Steuereinheit (15) zum Bestimmen der selektiven Aktivierung der Zangenmittel (21a, 21b) geeignet ist zum Einstellen des Moments, wenn das Abreißen der beiden freien Enden von Garn gemäß den Eigenschaften des Garns, der Art der Verwendung des Garns und den Umweltbedingungen gesteuert wird.

14. Vorrichtung gemäß einem vorhergehenden Anspruch, dadurch gekennzeichnet, dass die Steuereinheit (15) zum Bestimmen der selektiven Aktivierung von Schneidemitteln (22) in zeitlicher Korrelation zumindest mit den Zangenmitteln (21a, 21b), die die Enden der Garne ergreifen, und mit den Drehzangenmitteln (14a, 14b) gemäß den Eigenschaften des Garns, der Art der Verwendung des Garns und den Umweltbedingungen geeignet ist.

15. Vorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass die Drehzangenmittel (14a, 14b) von einem Elektromotor (12) antreibbar sind, der durch die Befehle der Steuereinheit (15) gesteuert wird.

16. Vorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass die Drehzangenmittel (14a, 14b) von pneumatischen Turbinenmitteln (43) antreibbar sind, die von den Befehlen der Steuereinheit (15) gesteuert werden.

17. Vorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass die Drehzangenmittel (14a, 14b) von elektrischen Spulenmitteln (42) antreibbar sind, die mit Magneten (41) zusammenwirken, und deren Antrieb durch die Befehle der Steuereinheit (15) gesteuert wird.

18. Vorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass an mindestens einem der Klemm-Mittel (21a, 21b), die die Enden der Garne (16a, 16b) greifen, Sensormittel vorhanden sind, die zum Durchführen eines Widerstands- und Streckungstestes an der eben gebildeten Verbindung geeignet sind.

19. Vorrichtung gemäß Anspruch 18, dadurch gekennzeichnet, dass die Sensormittel mindestens einen Kraftmesser aufweisen.

20. Verfahren zum Verbinden von Textilgarnen (16a, 16b) in einer Verbindungsvorrichtung (10) gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass es in Folge mindestens die folgenden Schritte aufweist:

- einen Schritt des Einführens der Garne (16a, 16b) in die Vorrichtung (10) und des Festklemmens ihrer Enden durch die jeweiligen Zangenmittel (21a, 21b) und die jeweiligen Drehzangenmittel (14a, 14b),

- einen Schritt des Entdrehens der Garne, wobei die elektronische Steuereinheit (15) die Drehzangenmittel (14a, 14b) steuert, mit einer Anzahl von Umdrehungen und einer Drehrichtung zu drehen, die mit den Eigenschaften des Garns korreliert,

- einen Schritt des Schließens der Verbindungskammer (13),

- einen Schritt, bei dem die Steuereinheit (15) die Zangenmittel (21a, 21b) steuert, sich mittels eines gesteuerten Antriebs der jeweiligen Motoren (12) zu bewegen, um die Garne (16a, 16b), die von den Drehzangen (14a, 14b) eingeklemmt sind, zu strecken, wobei die Größe der linearen Bewegung der Zangenmittel (21a, 21b) an die Eigenschaften des Garns gekoppelt ist zum entsprechenden Einstellen der Größe der vermittelten Streckung,

- einen Schritt, bei dem die Steuereinheit (15) die Zangenmitteln (21a, 21b) steuert, sich bis zum Vervollständigen des Arbeitsweges zu bewegen, so dass die beiden Enden zu entfernenden Enden des Garns (16a, 16b) mittels Ansaugens zum Reißen gebracht werden,

- einen Schritt, bei dem die Steuereinheit (15) das Schneidemittel (22) aktiviert zum Sicherstellen des Lösens der beiden zu entfernenden Garnsegmente,

- einen Schritt, bei dem die Steuereinheit (15) den Fluidstrahl in der Verbindungskammer (13) steuert, wobei Startmoment, Durchflussrate und Dauer des Strahls eine Funktion der Eigenschaften des Garns und der eingestellten Parameter sind,

- einen Schritt des erneuten Verdrehens der Garne (16a, 16b), wobei die Steuereinheit (15) die Drehzangen (14a, 14b) zum Drehen in der entgegengesetzten Richtung relativ zu der während des Entdrehens angenommenen Richtung steuert, wobei die Anzahl von Umdrehungen der Drehzangen (14a, 14b) eine Funktion der Eigenschaften des Garns und der eingestellten Parameter ist,

- einen Arbeitsgang-Fertigstellungsschritt, bei dem die Steuereinheit (15) die Schalen (30, 31) der Verbindungskammer (13) zum Öffnen steuert, dann die Drehzangen (14a, 14b) gelöst werden und schließlich die End-Klemm-Zangen (21a, 21b) in ihre Position zurückkehren.

Revendications

1. Dispositif pour joindre des fils textiles (16a, 16b), comprenant une chambre de jonction (13) à l'intérieur de laquelle les extrémités de deux fils (16a, 16b) destinés à être joints peuvent être introduites, ladite chambre de jonction (13) pouvant être fermée et définissant, dans sa position fermée, un compartiment de jonction pouvant être mis en contact avec un jet de fluide afin d'obtenir le joint, ledit dispositif comprenant, pour chacun des fils (16a, 16b), des premiers moyens de serrage (21a, 21b) pour serrer les extrémités du fil (16a, 16b), des seconds moyens de préhension (14a, 14b) tournant sensiblement autour de l'axe du fil relatif (16a, 16b) afin de réaliser le détordage et le retordage du fil (16a, 16b), et des moyens de coupe (22), caractérisé en ce que ladite chambre de jonction (13), lesdits moyens de serrage (21a, 21b) pour serrer les extrémités des fils (16a, 16b) et lesdits moyens de préhension rotatifs (14a, 14b), détordant et tordant, peuvent être entraînés par des moyens d'entraînement respectifs et indépendants gouvernés par les commandes d'une unité de commande électronique (15), dans lequel ladite unité de commande électronique (15) peut réguler au moins le moment de commencement, le débit et/ou la durée de distribution du jet dudit fluide sur les fils selon au moins un élément parmi les caractéristiques du fil, le type d'utilisation du fil et les conditions d'environnement, dans lequel chacun desdits moyens de préhension rotatifs (14a, 14b) peut transmettre à l'extrémité du fil respectif (16a, 16b) un nombre pouvant être contrôlé de rotations autour du leur propre axe pour leur détordage et retordage, et dans lequel lesdits moyens de serrage comprennent deux éléments de pinçage, un (21a) au-dessus et l'autre (21b) en dessous de ladite chambre de jonction (13), chacun desdits éléments de pinçage (21a, 21b) agissant sur une des deux extrémités desdits fils (16a, 16b) destinés à être joints et étant monté sur une vis relative (11) tournée par un moteur respectif (12), dans lequel chacun desdits moteurs (12) peut déplacer l'élément de pinçage respectif (21a, 21b) afin de réaliser une action d'étirage sur le fil relatif (16a, 16b) d'une quantité proportionnelle au nombre de révolutions transmises aux moteurs relatifs (12), dans lequel l'entité d'étirage peut être égale ou réciproquement différente dans les deux fils (16a, 16b).

2. Dispositif selon la revendication 1, caractérisé en ce que ladite unité de commande électronique (15) peut commander l'entraînement desdits moteurs (12) afin de déplacer lesdits moyens de pinçage (21a, 21b) d'une première position (A) dans laquelle lesdits moyens de pinçage s'ouvrent et sont prêts à recevoir le fil relatif (16a, 16b), une deuxième position (B) dans laquelle les moyens de pinçage (21a, 21b) se ferment, serrant à l'intérieur de ceux-ci, le fil relatif (16a, 16b), et une troisième position (C), dans laquelle la fonction de rompre les parties arrières est obtenue.

3. Dispositif selon une quelconque des revendications précédentes, caractérisé en ce que ladite chambre de jonction (13) est formée par deux coques mobiles (30, 31), dont au moins une est équipée d'orifices (32) à partir desquels un fluide sous pression sort, lors de la commande d'une électrovanne.

4. Dispositif selon la revendication 3, caractérisé en ce que lesdites coques (30, 31) peuvent être éloignées ou rapprochées l'une de l'autre, afin de prendre une première position réciproquement éloignée, dans laquelle ladite chambre de jonction (13) est ouverte et les extrémités desdits fils (16a, 16b), retenues par les moyens de pinçage respectifs (21a, 21b), peuvent être introduites à l'intérieur, et une seconde position de contact réciproque, dans laquelle la chambre de jonction (13) est fermée de façon étanche pour l'introduction dudit fluide à l'intérieur, à travers lesdits orifices (32), afin d'entrer en contact avec les fibres et obtenir le joint.

5. Dispositif selon la revendication 3, caractérisé en ce que ladite chambre de jonction (13) est formée de sorte que le jet de fluide crée un tourbillon de sorte que les fibres soient liées les unes aux autres, créant un joint de jonction entre les deux extrémités.

6. Dispositif selon la revendication 3, caractérisé en ce que ladite chambre de jonction (13), dans une et/ou l'autre desdites coques (30, 31) comprend des moyens (33) pouvant être sélectivement activés afin de serrer les fils (16a, 16b) à l'intérieur dudit compartiment de jonction, particulièrement dans le cas de fils élastiques.

7. Dispositif selon une quelconque des revendications précédentes, caractérisé en ce que ladite unité de commande électronique (15) peut réguler la direction de rotation et le nombre de rotations desdits éléments de pinçage rotatifs (14a, 14b) qui réalisent le détordage et le retordage des fils (16a, 16b) selon les caractéristiques du fil, le type d'utilisation du fil et les conditions d'environnement.

8. Dispositif selon une quelconque des revendications précédentes, caractérisé en ce que, dans l'étape consistant à détordre, le nombre de révolutions et la direction de rotation sont associés aux caractéristiques du fil afin d'obtenir l'annulation des torsions à proximité de l'élément de pinçage de serrage d'extrémité (21a, 21b).

9. Dispositif selon la revendication 7, caractérisé en ce que chacun desdits éléments de pinçage rotatifs (14a, 14b) comporte un oeillet (50) logeant le fil relatif (16a, 16b), dans lequel la position angulaire desdits éléments de pinçage rotatifs (14a, 14b) est contrôlée par un capteur (46) qui fournit un signal électrique approprié lorsqu'une tige de serrage (47) a été mise dans une position telle à permettre l'introduction desdits fils (16a, 16b).

10. Dispositif selon une quelconque des revendications précédentes, caractérisé en ce qu'il comprend des moyens, pouvant être entraînés par ladite unité de commande électronique (15), pour varier sélectivement le débit, la pression et la température du fluide injecté à l'intérieur de ladite chambre de jonction (13).

11. Dispositif selon une quelconque des revendications précédentes, caractérisé en ce qu'il comprend des moyens, pouvant être entraînés par ladite unité de commande électronique (15), pour injecter dans ladite chambre de jonction (13) un mélange d'air et d'eau dans un pourcentage réglable selon les caractéristiques du fil, le type d'utilisation du fil et les conditions d'environnement.

12. Dispositif selon la revendication 2, caractérisé en ce que ladite unité de commande (15) peut déterminer l'activation sélective desdits moyens de pinçage (21a, 21b) afin de réguler le moment de commencement lorsque l'étirage des deux segments de fil (16a, 16b) est réalisé, selon les caractéristiques du fil, le type d'utilisation du fil et les conditions d'environnement.

13. Dispositif selon la revendication 2, caractérisé en ce que ladite unité de commande (15) peut déterminer l'activation sélective desdits moyens de pinçage (21a, 21b) afin de réguler le moment auquel la rupture des deux extrémités libres de fil est commandée selon les caractéristiques du fil, le type d'utilisation du fil et les conditions d'environnement.

14. Dispositif selon une quelconque des revendications précédentes, caractérisé en ce que ladite unité de commande (15) peut déterminer l'activation sélective des moyens de coupe (22) en corrélation temporelle au moins avec les moyens de pinçage (21a, 21b) qui saisissent les extrémités des fils et avec les moyens de pinçage rotatifs (14a, 14b) selon les caractéristiques du fil, le type d'utilisation du fil et les conditions d'environnement.

15. Dispositif selon la revendication 1, caractérisé en ce que lesdits moyens de pinçage rotatifs (14a, 14b) peuvent être entraînés par un moteur électrique (12) gouverné par les commandes de ladite unité de commande (15).

16. Dispositif selon la revendication 1, caractérisé en ce que lesdits moyens de pinçage rotatifs (14a, 14b) peuvent être entraînés par des moyens de turbine pneumatique (43) gouvernés par les commandes de ladite unité de commande (15).

17. Dispositif selon la revendication 1, caractérisé en ce que lesdits moyens de pinçage rotatifs (14a, 14b) peuvent être entraînés par des moyens de bobine électrique (42) coopérant avec des aimants (41) et dont l'entraînement est gouverné par les commandes de ladite unité de commande (15).

18. Dispositif selon la revendication 1, caractérisé en ce que, sur au moins un desdits moyens de serrage (21a, 21b) qui saisissent les extrémités des fils (16a, 16b), se trouvent des moyens capteurs pouvant réaliser un essai de résistance et d'étirage sur le joint juste réalisé.

19. Dispositif selon la revendication 18, caractérisé en ce que lesdits moyens capteurs comprennent une cellule de charge.

20. Procédé pour joindre des fils textiles (16a, 16b), dans un dispositif de jonction (10) selon une quelconque des revendications précédentes, caractérisé en ce qu'il comprend, en séquence, au moins les étapes suivantes :

- une étape consistant à introduire les fils (16a, 16b) à l'intérieur du dispositif (10) et serrer leurs extrémités par l'intermédiaire des moyens de pinçage correspondants (21a, 21b) et des moyens de pinçage rotatifs correspondants (14a, 14b) ;

- une étape consistant à détordre les fils, dans laquelle l'unité de commande électronique (15) commande les moyens de pinçage rotatifs (14a, 14b) pour qu'ils tournent, avec un nombre de révolutions et une direction de rotation corrélés aux caractéristiques du fil ;

- une étape consistant à fermer ladite chambre de jonction (13) ;

- une étape dans laquelle ladite unité de commande (15) commande lesdits moyens de pinçage (21a, 21b) pour qu'ils se déplacent, au moyen d'un entraînement contrôlé des moteurs relatifs (12), afin d'étirer les fils (16a, 16b) serrés par les éléments de pinçage rotatifs (14a, 14b), dans lequel l'entité du mouvement linéaire des moyens de pinçage (21a, 21b) est associée aux caractéristiques du fil afin de réguler de manière correspondante l'entité de l'étirage transmis ;

- une étape dans laquelle ladite unité de commande (15) commande les moyens de pinçage (21a, 21b) pour qu'ils se déplacent jusqu'à ce que le déplacement soit complet de sorte que les deux extrémités du fil (16a, 16b) destinées à être éliminées soient rompues par des moyens d'aspiration ;

- une étape dans laquelle ladite unité de commande (15) active les moyens de coupe (22) pour garantir la décharge des deux segments de fil destinés à être éliminés ;

- une étape dans laquelle ladite unité de commande (15) commande le jet de fluide à l'intérieur de la chambre de jonction (13), dans lequel le moment de commencement, le débit et la durée du jet sont une fonction des caractéristiques du fil et des paramètres réglés ;

- une étape consistant à retordre les fils (16a, 16b), dans laquelle ladite unité de commande (15) commande les éléments de pinçage rotatifs (14a, 14b) pour qu'ils tournent dans la direction opposée par rapport à la direction adoptée au cours du détordage, dans laquelle le nombre de révolutions desdits éléments de pinçage rotatifs (14a, 14b) est une fonction des caractéristiques du fil et des paramètres réglés ;

- une étape d'achèvement de cycle, dans laquelle ladite unité de commande (15) commande les coques (30, 31) de ladite chambre de jonction (13) pour qu'elles s'ouvrent, puis lesdits éléments de pinçage rotatifs (14a, 14b) sont libérés et enfin les éléments de pinçage de serrage d'extrémité (21a, 21b) retournent à leur position.

Drawing