Apparatus for joining fabric yarns and corresponding joining method

Abstract

1. A splicing device for splicing textile yarns (F1, F2) using detwisting and subsequent recombination of the fibers of the two ends of the textile yarns (F1, F2) to form a single yarn (F), the splicing device comprising two counter-rotating components (11), each comprising at least one splicing element (12), arranged opposite each other and defining a splicing zone (G) defined by the area between the respective splicing elements (12) that are substantially aligned along an actuation axis (X) facing each other.

Description

Technical Field

[0001] The embodiments described herein relate to an apparatus for splicing textile yarns. In particular, the apparatus is used to perform stable splicing of the ends of two textile yarns by using the overall or partial disentanglement of the twist of the end segments defined by both textile yarns and the recomposition of the yarn using these combined ends.

[0002] The invention also relates to a method for splicing textile yarns.

Background Art

[0003] Splicing devices are known that eliminate the twist present at the ends of two textile yarns, join them, and recombine the twist to produce a single continuous yarn of a desired length without significant variation in the size of the area where the splicing occurs.

[0004] In particular, splicing devices are known that use two counter-rotating components into which the ends of the yarns to be spliced are inserted to disentangle and recombine the twist.

[0005] For example, U.S. Patent No. 4,637,205, which provides a splicing device using two counter-rotating components facing each other, is known. The ends of the two yarns to be spliced are inserted between the counter-rotating components and are axially adjacent and oppositely positioned. These components rotate in opposite directions with respect to the inserted textile yarns at a desired distance from each other, apply a desired pressure from one to the other to first eliminate the twist, then align the fibers of the two ends, and then reverse the direction of rotation to twist the combined and substantially parallelized fibers of the two textile yarns to be joined together to recombine them into a single yarn.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

[0007] However, since it is completely mechanical and driven by, for example, a cam mechanism, etc., the apparatus has a large number of components and consequently involves complicated and slow operation.

[0008] This means that a long time is required to join the fabric yarns, resulting in low productivity of the joining apparatus itself and causing a significant downtime in the equipment for producing the fabric yarns that the apparatus may be associated with.

[0009] Furthermore, due to the large number of components of the apparatus, maintenance work is time-consuming and costly, also resulting in a long downtime of the apparatus and a further reduction in productivity as a result.

[0010] Furthermore, U.S. Patent No. 4,637,205 also describes a method of joining the opposing ends of two fabric yarns using decomposition and subsequent recomposition of the twist of the end fibers to form a single yarn. This method is schematically shown as an example in FIGS. 1a - 1e and provides the following. - Introducing the yarns F1, F2 to be joined between two components 111 of a known apparatus 110 (FIG. 1a) - Bringing the yarns F1, F2 closer together between the components 111 of the known apparatus 110 using reverse rotation R of the components 111 (FIG. 1b) - Removing the end portions of the yarns F1, F2 that do not contribute to the joining (FIG. 1c) using a removing means 113 - Bringing the ends of the yarns F1, F2 to be joined closer together and overlapping them using a mechanical approaching means 112 (FIG. 1d) - Performing another reverse rotation R to twist the ends of the overlapping yarns F1, F2 to be joined (FIG. 1e)

[0011] However, since it is obtained using known devices, this method involves long splicing times and consequently high costs.

[0012] Furthermore, this method does not guarantee optimal splicing of the yarns.

[0013] Other splicing systems known in the prior art are described in German Patent Application Publication No. 102006000824 regarding known devices for splicing yarns within a textile machine, and in U.S. Patent No. 4386494 regarding a method and device for splicing bundles of fibers as produced in the textile industry.

[0014] Thus, known splicing devices, mainly of the mechanical type, are complex, have a large number of components, and are difficult to install and adapt to different winders.

[0015] Therefore, there is a need to complete a device for splicing textile yarns that can overcome at least one of the drawbacks of the prior art.

[0016] In particular, one object of the present invention is to provide a device for splicing textile yarns that enables an increase in productivity by quickly splicing two series of yarns and simultaneously producing continuous high-quality yarns.

[0017] Also, the present invention aims to provide a device for splicing textile yarns with simplified maintenance.

[0018] Also, the present invention aims to provide a device for splicing textile yarns that is highly versatile and can be installed on different winders.

[0019] Also, the present invention aims to complete a method for quickly and efficiently splicing two yarns.

[0020] The applicant has devised, tested, and embodied the present invention to overcome the drawbacks of the prior art and achieve these and other objects and advantages.

Means for Solving the Problem

[0021] The present invention is recited and characterized in the independent claims. The dependent claims describe variations with respect to other features of the present invention or the main inventive concept.

[0022] For the above object, the present invention relates to a fabric yarn splicing device for splicing the ends of fabric yarns by using the decomposition and subsequent recombination of the twists of the fibers at the opposing ends of two fabric yarns to form a single yarn.

[0023] In the present invention, the fabric yarn is intended to be a yarn composed of a plurality of fibers derived from animal, plant, and / or synthetic fibers.

[0024] In the case of synthetic fibers, it can be a yarn having grouped and twisted fibers. Such a yarn can provide an elastic core yarn for use in fabrics that are partially or entirely elastic.

[0025] The splicing device includes two reversely rotating components.

[0026] Each of the components is provided with at least one splicing element.

[0027] The components are arranged opposite to each other and define a splicing zone between the respective splicing elements that are substantially aligned along the operating axis facing each other.

[0028] According to one aspect of the present invention, the splicing device is configured to move at least one of the components at least selectively along the operating axis to adjust the width and size of the splicing zone and to selectively rotate the components relative to each other around the operating axis to obtain the decomposition and subsequent recombination of the twists of the yarn fibers, and includes one or more motor members.

[0029] Advantageously, one or more motor members are electrically driven, enabling the splicing device to be automated, simplifying its driving, control, and maintenance, and reducing the required bulk.

[0030] In particular, such one or more motor members are electric, preferably of the stepper or brushless type, or one of one type and one of the other type. However, it is not excluded that such a motor member is pneumatic.

[0031] In addition, the motor members can reduce the number of mechanical components required to move components towards each other or rotate components, making the splicing device smaller and overall lighter, and reducing maintenance intervention and complexity.

[0032] According to the invention, the device also comprises a control unit having an internal memory provided with a list of functional parameters of two components for splicing textile yarns and thus for controlling all of one or more motor members and those associated therewith.

[0033] According to one aspect of the invention, the control unit is configured to control and command one or more motor elements based on the functional parameters present in the internal memory.

[0034] According to one variant, the control unit has means for processing data related to splicing, and those means have functions involving such data and the motor members that generate them.

[0035] At least one of the motor members can comprise a position transducer or encoder, and such a control unit will be configured to command this at least one motor member as a function of such functional parameters and the values detected by such a position transducer.

[0036] Advantageously, the control unit enables the complete automation of joining two fabric threads, shortening the joining time, optimizing the joining, and at the same time ensuring high-quality continuous joined threads. For example, this control unit with a stand-alone electronic card can directly control each motor member. The joining device of the present invention is also extremely versatile and can be installed on different types of winders.

[0037] According to a first variant, the control unit stores each obtained result from the perspective of the diameter and length of the join, and periodically updates the functional parameters pre-recorded in the internal memory.

[0038] According to another variant, the control unit records each stage of the activity of the joining device.

[0039] In this way, on the one hand, the always-optimal function of the device is guaranteed, and abnormalities in its function and in the obtained joins are prevented. On the other hand, it becomes possible to analyze each cycle and evaluate all its aspects.

[0040] For example, this control unit can perform device diagnostics after each join and / or periodically for dynamic self-adjustment, and in some cases, further process data to prevent the occurrence of abnormalities as described above.

[0041] In particular, at least one motor member can have a dedicated receiving encoder, and according to one variant, it can also be an interactive encoder that communicates with the control unit, which is for ensuring more effective control of the behavior of each motor member.

[0042] According to one embodiment, the device comprises a first motor member configured to selectively move at least one of two components along the operating axis, and a second motor member configured to rotate two components in opposite directions relative to each other around the operating axis.

[0043] According to one variant, the splicing device comprises a third motor member configured to drive holding means suitable for keeping the textile yarns in a tensioned state within the splicing zone.

[0044] In particular, the control unit can appropriately adjust the position of the holding means as a function of the type of yarn and its desired tension within the splicing zone.

[0045] According to another variant, the splicing device comprises a fourth motor member configured to drive removing means suitable for removing the end portions of the yarns that are not necessary for the splicing operation in order to prepare two yarns for the splicing operation.

[0046] The third motor member and / or the fourth motor member can be independent or obtained from the first and / or second motor members.

[0047] According to some embodiments, the splicing device comprises a plurality of sensor means cooperating with the motor members as described above for the correct execution of the respective functions.

[0048] The invention also relates to a method for splicing the end portions of two textile yarns by using the disentanglement and subsequent recomposition of the twists of the fibers or filaments present at the facing end portions of the two textile yarns to form a single yarn.

[0049] The splicing method provided by the invention is, as described above, not limited to the following, but is known, for example, as described in US Patent No. 4,637,205, and includes means intended to achieve exactly the same functions as the known functions.

[0050] The known method is introducing the two textile yarns to be spliced between two components, each component being provided with at least one splicing element, arranged facing each other and aligned along the working axis, defining a splicing zone between the respective facing splicing elements, introducing the textile yarns. Moving the two components along the axis of rotation towards each other until there is at least partial contact between the facing joining elements; Rotating the two components in opposite directions relative to each other so that the two threads approach each other and become parallel within the joining zone; Removing the end portions of the threads that do not contribute to the joining and obtaining the facing end portions of the two fabric threads to be joined; Moving the end portions of the two fabric threads to be joined towards each other until they substantially overlap; Rotating the two components in opposite reverse directions relative to each other so as to twist the two end portions of the two fabric threads to produce a single thread; comprising.

[0051] According to one aspect of the present invention, the method also includes making available in the internal memory of the control unit a list of functional parameters of the components for joining fabric threads.

[0052] According to one aspect of the method according to the present invention, the control unit commands and controls, as a function of the functional parameters, one or more dedicated motor members that perform one or more of the steps of introducing the fabric threads into the joining zone, moving the two components towards each other, rotating the two components, removing the end portions of the fabric threads, moving the end portions of the obtained fabric threads towards each other, and rotating the two components in opposite reverse directions.

[0053] By one or more motor members, in particular, it means any one or more of the first, second, third, or fourth motor members as described above.

[0054] However, it should be noted that at least one motor member can be provided for each of the steps as described above, or one motor member can be designated for the execution of one or more or all of the steps.

[0055] Advantageously, by using a control unit and one or more motor members, an efficient and fully automated splicing method can be obtained.

[0056] According to the present invention, as a non-limiting example, it is possible to optimize, accelerate, and improve the splicing of textile yarns and shorten the downtime in a production line of textile yarns and in combination with a machine for processing the yarns.

[0057] According to one embodiment, the following is also provided. - Detecting and monitoring the movement of at least one of the components along the operating axis - Detecting the rotation of at least one of the components around the operating axis during rotation and reverse rotation

[0058] In particular, the control unit commands and controls the functions of one or more motor members based on the functional parameters stored in the internal memory and based on the parameters detected in the detection as described above.

[0059] These detections can optimize the management of one or more motor members assigned to the steps as described above, facilitating and improving the splicing of textile yarns.

[0060] The control unit can thus control the correct execution of each of the steps as described above and the results obtained in each of them.

[0061] When the control unit detects an abnormality in the function of the device or in the spliced yarn obtained, the control unit resets the device with new functional parameters.

[0062] According to a variant, the control unit can be enabled to interact, each time or continuously, with a service processor that supports one or more splicing devices.

[0063] These and other aspects, features, and advantages of the present invention will become apparent from the following description of some embodiments given by way of non-limiting example with reference to the accompanying drawings.

Brief Description of the Drawings

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Embodiments for Carrying Out the Invention

[0065] For ease of understanding, the same reference numbers were used to identify the same common elements in the drawings where possible. It is understood that the elements and characteristics of one embodiment can be conveniently incorporated into other embodiments without further explanation.

[0066] Reference will now be made in detail to possible embodiments of the present invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided by way of illustration of the present invention and should not be construed as a limitation thereof. It is understood that the present invention encompasses all possible changes and modifications. Also, it should be made clear that the phrases and terms used herein are for illustrative purposes only and cannot be regarded as limiting.

[0067] Referring to FIGS. 2 to 3, as a non-limiting example, a splicing device 10 for splicing the ends of two fabric yarns F1, F2 by using the decomposition and subsequent recombining of the twists of the fibers at the opposing ends of the two fabric yarns F1, F2 to form a single yarn F is shown.

[0068] The device 10 includes two counter-rotating components 11a, 11b arranged opposite to each other.

[0069] Each component 11a, 11b includes at least one splicing element 12.

[0070] In particular, the two components 11a, 11b are arranged opposite to each other so as to face two respective splicing elements 12, and a splicing zone G is defined between the two components.

[0071] In use, the two ends of the two yarns F1, F2 to be spliced are inserted between the two components 11a, 11b.

[0072] Each component 11 includes a frame 17 having a housing pedestal 18 in which the splicing element 12 is arranged to be axially movable.

[0073] Such a splicing element 12 can have a substantially plate or disc shape.

[0074] Each splicing element 12 can include at least one support plate 15 and an upper plate 16 arranged above the support plate 15 and facing outside the housing pedestal 18.

[0075] In particular, the upper plate 16 can be made entirely or partially of a soft material that is partially and elastically deformable.

[0076] Each component 11 is provided within the housing pedestal 18 and includes spring means 19 that are associated with the housing pedestal 18 on one side and with the joining element 12 on the opposite side.

[0077] In particular, the spring means 19 are configured to selectively move the joining element 12 axially relative to the housing pedestal 18.

[0078] Referring to FIGS. 2 to 8, the first component 11a is disposed between the housing pedestal 18 and the joining element 12 and includes bellows means 20 configured to cooperate with the spring means 19 by the axial movement of the joining element 12 as described above.

[0079] Referring to FIGS. 2 to 8, the second component 11b is positioned facing the first component 11a and includes a circular joining element 12a and an annular joining element 12b that is concentric with the circular joining element 12a and is located outside thereof.

[0080] The second component 11b can include first spring means 19a associated with the circular joining element 12a and second spring means 19b associated with the annular joining element 12b and independent of the first spring means 19a described above.

[0081] Referring to FIGS. 2 to 8, the annular joining element 12b projects above the circular joining element 12a and externally relative to the housing pedestal 18.

[0082] Each component 11a, 11b can include one or more guide pins 45 integral with the frame 17 to enable correct axial sliding of each joining element 12 relative to the frame 17.

[0083] Furthermore, at least one of the components 11a, 11b can be provided with a centering pin 47 that is integral with the frame 17 in its respective housing pedestal 18 and that selectively projects centrically toward the splicing element 12 after movement of the splicing element 12 toward the inside of the housing pedestal 18.

[0084] According to the invention, the apparatus 10 is configured to selectively move at least one of the components 11a, 11b along the operating axis X so as to adjust at least the width and size of the splicing zone G, and to selectively rotate the components 11a, 11b relative to each other about the operating axis X in order to obtain disentanglement and subsequent recomposition of the twists of the fibers of the yarns F1, F2, and comprises one or more motor members 13, 14, 31, 40.

[0085] In particular, the first motor member 13 is configured to place at least one of the two components 11a, 11b in one or more positions along the operating axis X in cooperation with the other of the components 11a, 11b.

[0086] As a non-limiting example, in FIGS. 2 to 8, the first component 11a and the second component 11b are associated with a support structure 21, and the second component 11b is movable along the operating axis X relative to the first component 11a and the support structure 21.

[0087] The first motor member 13 can drive at least one transmission mechanism 22 including, as a non-limiting example, a piston, a rack, and a worm screw means (see, for example, the worm screw 48 in FIG. 9), and / or any other means capable of imparting a linear translational movement to at least one of the components 11a, 11b.

[0088] According to one embodiment, the second motor member 14 is configured to rotate the two components 11a, 11b relative to each other in opposite directions about the operating axis X in order to obtain disentanglement and subsequent recomposition of the twists of the fibers of the yarns F1, F2.

[0089] The second motor member 14 can drive a moving means 23 including, as non-limiting examples, toothed wheels 24, 25, 26, a belt, and / or any other means capable of imparting relative rotation to the two respective components 11a, 11b.

[0090] As a non-limiting example, referring to FIGS. 4-8, the second motor member 14 rotates the toothed drive wheel 24 in one direction, which in turn causes an intermediate element 25 configured to engage on one side with the first component 11a and on the opposite side with at least one motion-reversing wheel 26 to rotate, and the motion-reversing wheel 26 is configured to engage with the second component 11b so as to transmit a rotation that is always opposite to the rotation of the first component 11a.

[0091] In this case, in order to reverse the rotation of the two components 11a, 11b, the second motor member 14 reverses the rotation of the drive wheel 24.

[0092] According to the present invention, the apparatus 10 comprises a control unit 29 having an internal memory 44 provided with a list of functional parameters of the two components 11a, 11b for splicing the threads F1, F2. For example, such a control unit 29 can comprise a stand-alone electronic card.

[0093] According to one embodiment, the functional parameters include the speed of movement of at least one of the components 11a, 11b along the operating axis X, the rotational speed of the components 11a, 11b, the type of the threads F1, F2 to be spliced, the axial force between the opposing components 11a, 11b, and / or the contact area within the splicing zone G between the opposing splicing elements 12.

[0094] The functional parameters can also include, but are not limited to, the positioning coordinates of the components 11a, 11b along the operating axis X, the rotation angle with respect to the operating axis X as a function of the operation to be performed, and a list of the types of the threads F1, F2.

[0095] Such functional parameters can be manually input by an operator or automatically input by a software system.

[0096] In particular, the memory 44 can provide a plurality of sets of functional parameters (one set for each type of thread to be spliced).

[0097] The type of thread means consistency, material, average length of the fibers constituting the thread, diameter of the thread, and / or other similar or equivalent characteristics.

[0098] In particular, the control unit 29 is configured to control and command one or more of the motor members 13, 14, 31, 40 based on the functional parameters present in such a memory 44.

[0099] This control unit 29 can be provided on the apparatus 10, but the apparatus 10 can also be driven and controlled remotely.

[0100] According to one embodiment, the splicing apparatus 10 comprises first sensor means 27 configured to detect the movement of two components 11a, 11b moving towards and / or away from each other.

[0101] As a non-limiting example, the first sensor means 27 can be of a magnetic or optical type and / or any other type suitable for detecting the movement of at least one of the components 11a, 11b along the operating axis X.

[0102] As a non-limiting example (Figs. 4 - 8), the first sensor means 27 comprises at least one emitter provided on a component 11b movable along the operating axis X and respective receivers associated with a support structure 21 provided fixed with respect to the operating axis X. In this way, the receivers detect the distance from the emitter when the second component 11b moves along the operating axis X.

[0103] As a non-limiting example, the emitter can be a magnet, and the receiver can be an inductive sensor.

[0104] When both components 11a, 11b move along the operating axis X, the emitter can be provided on each of the components 11a, 11b.

[0105] According to one embodiment, the control unit 29 is configured to command one or more motor members 13, 14, 31, 40 as a function of the functional parameters and the values detected by the first sensor means 27.

[0106] According to one embodiment, the splicing device 10 comprises second sensor means 28 configured to detect the rotational angle of at least one of the two components 11a, 11b.

[0107] As a non-limiting example, the second sensor means 28 can be of any other type suitable for detecting the rotation of at least one of the components 11a, 11b around the magnetic or optical type and / or the operating axis X.

[0108] As a non-limiting example, referring to FIGS. 4 to 8, the second sensor means 28 can comprise at least one signal transmitter 28a integrally provided on at least one of the components 11a, 11b, and at least one respective acquisition element 28b associated with a support structure 21 fixedly provided with respect to the operating axis X. In this way, the acquisition element 28b detects the distance from the signal transmitter 28a when the component 11a, 11b provided with the signal transmitter 28a rotates around the operating axis X.

[0109] Referring to FIG. 2, the second sensor means 28 can comprise one or more signal transmitters 28a arranged at an angular distance on the components 11a, 11b, so that each signal transmitter 28a cooperates with the acquisition element 28b to identify the angular position of the components 11a, 11b.

[0110] As a non-limiting example, the signal transmitting device 28a can be an element that generates a magnet or an optical beam, and the acquisition elements 28b can be induction or optical sensors, respectively.

[0111] According to one embodiment, the control unit 29 is configured to command one or more motor members 13, 14, 31, 40 as a function of the functional parameters and the values detected by the second sensor means 28.

[0112] In particular, the control unit 29 is configured to command the first motor member 13 and the second motor member 14 as a function of the functional parameters and the values detected by the first sensor means 27 and the second sensor means 28, respectively.

[0113] In this way, the control unit adjusts the distance between the two components 11a, 11b and their respective rotations extremely accurately and quickly, obtains the values detected in real time by the first sensor means 27 and the second sensor means 28, compares these values with the pre-stored functional parameters, and in case of contradictions, corrects the positions of the components 11a, 11b in real time so as to obtain a high-quality spliced thread.

[0114] According to one embodiment, the device comprises a third motor member 31 configured to drive holding means 30 suitable for keeping the threads F1, F2 in a tensioned state within the splicing zone G.

[0115] The holding means 30 is movable from a non-operating position where the holding means 30 does not interfere with the splicing zone G to an operating position on the opposite side of the splicing zone G where the holding means 30 cooperates with the components 11a, 11b.

[0116] In particular, the third motor member 31 is configured to move the holding means 30 at least from the non-operating position to the operating position.

[0117] Furthermore, the third motor member 31 can be configured to move the holding means 30 so as to keep the yarns F1, F2 in a tensioned state within the splicing zone G where the yarns F1, F2 are spliced together.

[0118] The holding means 30 can include a pair of holders 32 configured to selectively hold the yarns F1, F2 and keep the yarns F1, F2 in a tensioned state throughout the splicing period.

[0119] In particular, the pair of holders 32 can be arranged in a transverse direction with respect to the operating axis X.

[0120] The third motor member 31 can be configured to activate each holder 32 such that each holder 32 holds the yarns F1, F2 in the operating position.

[0121] Referring to FIGS. 2 to 8, the holding means 30 includes one or more articulated arms 33 for each holder 32, and the one or more articulated arms are associated with the third motor 31 on one side and each holder 32 on the opposite side.

[0122] The third motor member 31 can be configured to move the articulated arm 33 associated with each holder 32 so as to place each holder 32 in the operating position for holding the yarns F1, F2.

[0123] According to one embodiment, the splicing device 10 includes third sensor means 34 configured to detect the movement of the holding means 30 from the operating position to the non-operating position and vice versa.

[0124] The third sensor means 34 can be of magnetic and / or optical type, for example, as a non-limiting example.

[0125] As a non-limiting example (FIGS. 4 to 8), the third sensor means 34 can include two detection elements 34b provided on the third motor member 31 and one detected element 34a associated with, for example, the articulated arm 33 connected to the third motor member 31.

[0126] In particular, in this case, the two detection elements 34b identify the non-operating position and the operating position of the pair of clamping devices 32.

[0127] The control unit 29 can be configured to command the third motor member 31 as a function of the functional parameters and the values detected by the first sensor means 27, the second sensor means 28, and the third sensor means 34, respectively. In this way, it is possible to automate the tensioning and maintaining of the yarn in the splicing zone G.

[0128] According to one embodiment, the device 10 comprises a fourth motor member 40 configured to drive removal means 36 capable of removing the end portions of the yarns F1, F2 that are not required for splicing.

[0129] In particular, the removal means 36 preferably comprises a pair of gripping elements 37 that are aligned with each other on both sides where the yarns F1, F2 are supplied towards the two components 11a, 11b and are arranged on the opposite side of the splicing zone G.

[0130] The removal means 36 can comprise guide elements 38 associated with the respective gripping elements 37.

[0131] In particular, these guide elements 38 are configured to move the respective gripping elements 37 parallel to the operating axis X.

[0132] According to one embodiment, the fourth motor member 40 is configured to move each gripping element 37 along the respective guide element 38 to a desired position in order to remove the end portions of the yarns F1, F2.

[0133] The fourth motor member 40 can also be configured to operate the pair of gripping elements 37 to grip the end portions of the respective yarns to be removed and pull the end portions along the guide elements 38 to tear them by untying the end portions.

[0134] The fourth motor member 40 can be obtained from the third motor member 31.

[0135] The removing means 36 can be provided corresponding to the holder 32 of the holding means 30 and can be configured to cooperate with the holder 32 during the splicing of the yarns F1, F2.

[0136] The apparatus 10 can be provided with a fourth sensor means 39 for detecting the position of the gripping element 37 along the guide element 38.

[0137] Such a fourth sensor means 39 can be, by way of non-limiting example, magnetic, optical, inductive, and / or capacitive.

[0138] The control unit 29 can be configured to move a pair of gripping elements 37 along their respective guide elements 38 by dividing the fourth motor member into zones as a function of the functional parameters and the values detected by the first, second, third, and fourth sensor means 27, 28, 34, 39. In this way, the splicing of the yarns F1, F2 can be fully automated, with the operator's intervention being minimized and the apparatus 10 being optimized.

[0139] Furthermore, the apparatus 10 can be provided with at least one sensor for recognizing the yarns F1, F2 to be spliced.

[0140] This recognition sensor can be optical and can detect the diameter of the yarns F1, F2 and the material of which the yarns are composed, and can transmit these parameters to the control unit 29. The control unit 29 can thus select the appropriate functional parameters of the apparatus 10 for the identified spliced yarns.

[0141] According to one variant, the control unit 29 is suitable for interacting with a first spinning yarn catcher (not shown) positioned downstream of the apparatus 10 in order to evaluate the obtained splicing. When the first spinning yarn catcher is electronic, the interaction is a mutual interaction.

[0142] According to one variant, the device comprises detection means configured to detect at least the thickness of the thread.

[0143] Such detection means can communicate directly through the device 10 and / or the control unit 29.

[0144] Such detection means can provide at least one sensor, such as a light sensor by way of non-limiting example, for verifying the splices carried out.

[0145] This verification sensor can detect, by way of non-limiting example, the diameter, length, number of twists, and tightness of the obtained splice of the thread.

[0146] In particular, the control unit 29 can also compare these parameters detected by the verification sensor with the desired parameters preset in the memory 44, taking into account the possible tolerances. Based on this comparison, the control unit 29 can update and correct the functional parameters of the device 10 pre-stored in the memory 44.

[0147] For example, furthermore, the control unit 29 can communicate to the operator the splices just made or the anomalies found within the device 10 by means of optical and / or acoustic signals.

[0148] Advantageously, the control unit 29 is of the programmable type and can control and command the device 10 in a dynamic and versatile manner, recognize the types of threads F1, F2 to be spliced, and evaluate the obtained splices in order to obtain the best possible results.

[0149] According to one embodiment, the device 10 is provided with a pair of cutting elements 35 configured to cut the ends of the threads to be spliced.

[0150] In particular, the cutting elements 35 project in a radial position from the frame 17 of at least one of the components 11a, 11b.

[0151] The cutting element 35 can be selectively removed from the frame 17 so as to facilitate the maintenance and replacement operations of the cutting element 35 itself.

[0152] According to one embodiment, the cutting element 35 is configured to rotate integrally with the components 11a, 11b in which the cutting element 35 is provided, and to cut the end portions of the yarns F1, F2 that are not necessary for splicing.

[0153] The cutting element 35 can be a blade, a cutting plate, or a cutting element that protrudes from the frame 17 so as to capture the yarns F1, F2 during the rotation of the components 11a, 11b and is provided integrally with the frame 17.

[0154] According to one variation, the cutting element 35 can be provided on the first component 11a, and another cutting element 35 can be provided on the second component 11b so as to cooperate with each other during rotation as described above.

[0155] Advantageously, this pair of cutting elements 35 cleanly cuts the end portions of the yarns F1, F2 and prevents the use of the removing means 36 that is considered to cause stretching and loss of elasticity of the yarns, so it is particularly efficient in the case of woven fabric yarns that are partially or entirely elastic.

[0156] The method of splicing the opposing end portions of the two woven fabric yarns F1, F2 can be obtained by using the disentanglement and subsequent recomposition of the twists of the fibers of such end portions to form a single yarn F.

[0157] In particular, referring to FIGS. 4 to 8, the splicing method includes introducing the two yarns F1, F2 to be spliced between the two components 11a, 11b within a splicing zone G between the respective splicing elements 12 that are opposed to each other and aligned along the operating axis X (FIGS. 4a to 4c); and The step of bringing two components 11a, 11b closer to each other along the operating axis X until there is at least partial contact between the opposing joining elements 12 (Figs. 5a - 5c); The step of rotating two components 11a, 11b in opposite directions relative to each other so that two threads F1, F2 are brought closer to each other and parallel within the joining zone G (Figs. 5a - 5c); The step of removing the end portions of the threads F1, F2 that do not contribute to the joining and obtaining two end portions of the two threads F1, F2 to be joined (Figs. 6a - 6c); The step of bringing the end portions of the two threads F1, F2 to be joined closer to each other until they substantially overlap; The step of reversely rotating two components 11a, 11b in opposite directions relative to each other so as to twist the opposing end portions of the two threads F1, F2 to generate a single thread F.

[0158] According to the present invention, such a method also includes the step of making available in the internal memory 44 of the control unit 29 a list of functional parameters of the components 11a, 11b for joining fabric threads.

[0159] This control unit 29 commands and controls one or more motor members 13, 14, 31, 40 assigned to execute one or more of the above - mentioned steps as a function of the functional parameters.

[0160] In particular, in order to execute the above - mentioned steps, the two components 11a, 11b take different operating positions along the operating axis X relative to each other.

[0161] According to one embodiment, the method includes the step of detecting and monitoring the movement of at least one of the components 11a, 11b along the operating axis X.

[0162] According to one embodiment, the method includes the step of detecting the rotation of at least one of the components 11a, 11b around the operating axis X during rotation and reverse rotation.

[0163] Advantageously, the control unit 29 commands and controls the functions of the components 11a, 11b based on the functional parameters stored in the internal memory 44 and based on the parameters detected in the detection as described above, so that the splicing of the threads F1, F2 is automated and optimized.

[0164] In particular, the first motor member 13 brings the two components 11a, 11b closer to each other until there is contact between the splicing element 12 of the first component 11a and the external annular splicing element 12b of the second component 11b (Figs. 5a - 5b).

[0165] By bringing them closer to each other in this way, it becomes possible to radially sandwich the two threads F1, F2 between the splicing element 12 of the first component 11a and the external annular splicing element 12b of the second component 11b.

[0166] With the threads F1, F2 sandwiched between the two components 11a, 11b, the third motor member 31 can command the holding means 30 to selectively fasten the threads F1, F2 at positions defined outside the components 11a, 11b. In the stage of rotating the two components 11a, 11b in opposite directions with respect to each other, the second motor member 14 can command the opposite - direction rotation of the two components 11a, 11b so that the two threads F1, F2 are brought closer and parallel along the identified diameter by the facing and cooperating splicing element 12 and annular splicing element 12b.

[0167] In particular, during all the above - mentioned stages, the command unit 29 commands and controls the holding means 30 to always keep the threads F1, F2 in the correct tensile state within the splicing zone G.

[0168] The parallelization between the two threads F1, F2 can be guided by at least two or more pegs 41 provided protruding on both splicing elements 12 by known methods, so that during rotation, the opposing pegs 41 align the two threads F1, F2 along the diameter as described above while pulling the two threads F1, F2 along the above - mentioned positions.

[0169] In particular, when the threads are paralleled within the splicing zone G, the first motor member 13 can bring the two components 11a, 11b closer to each other until there is contact between the splicing element 12 of the first component 11a and the centering pin 47 of the second component 11b so as to centrally restrain the two paralleled threads F1, F2 between the two components 11a, 11b (Figs. 6a - 6c). In particular, at this position where the splicing elements 12, 12a, 12b are not in contact, the end portions of the threads are removed.

[0170] According to one embodiment, the removal is carried out by cutting or preferably by tearing.

[0171] In particular, in the case of tearing, after the rotation of the components 11a, 11b, the fourth motor member 40 drives the removal means 36 to tear the end portions of the threads F1, F2 emerging from the splicing zone G.

[0172] In particular, in the case of cutting, since the cutting element 35 is integral with the frame 17, during rotation, it is arranged parallel to the threads F1, F2 and cuts the end portions of the respective threads F1, F2 emerging from the two components 11a, 11b.

[0173] Referring to Fig. 6b, the cutting element 35 can cooperate with the gripping element 37 to obtain a cleaner and more accurate cut of the threads F1, F2.

[0174] The step of bringing the two end portions of the two opposing threads F1, F2 closer to each other can be carried out during and / or after the removal of the end portions (Figs. 7a - 7c).

[0175] In particular, at least one of the two components 11a, 11b can provide gripping means 43 (Fig. 7b) configured to selectively project from the splicing element 12 to bring the end portions of the threads F1, F2 closer to each other.

[0176] After the rotation of the components 11a, 11b, the gripping means 43 can perform automatic driving.

[0177] For example, the gripping means 43 can be driven by opposing levers, and the levers can be mechanically actuated at the end of the rotation progression of the respective components 11a, 11b on which the levers are provided.

[0178] According to one variation, the gripping means 43 can be commanded by a dedicated motor.

[0179] The gripping means 43 can comprise, as a non-limiting example, one or more grippers integral with the frame 17 provided within the housing pedestal 18 and passing through the thickness direction of the splicing element 12.

[0180] In particular, such gripping means 43 is retracted within the thickness of the splicing element 12.

[0181] For example, the grippers of the gripping means 43 project from the splicing element 12 after its movement towards the inside of the housing pedestal 18.

[0182] According to one embodiment, at least one of the two components 11a, 11b can be a plurality of holes 42 provided on at least one of the components 11a, 11b, the plurality of holes 42 being configured to introduce air between the cooperating components 11a, 11b or to suck the air therebetween so as to bring the ends of the two threads F1, F2 closer together and facilitate their twisting.

[0183] Such holes 42 can be provided along the diameter of the splicing element 12.

[0184] The holes 42 can be configured to cooperate with the gripping means 43 by introducing air into or preferably sucking air into the splicing zone G to bring the two ends to be spliced closer together and densify them so as to optimize the mutual approach of the fibers at the ends of the two threads F1, F2.

[0185] The control unit 29 can be configured to command an air suction / blowing member (not shown) configured to send / suck air through, for example, the hole 42 in cooperation with the functions of the components 11a and 11b during splicing.

[0186] In particular, the hole 42 can be provided on the gripping means 43 on one of the components 11a, 11b and the other component 11a, 11b facing it. In this way, the cooperation between the hole 42 and the gripping means 43 becomes more efficient.

[0187] As a non-limiting example, referring to FIGS. 4a to 8a and FIGS. 4b to 6b, the hole 42 can be provided on the splicing element 12 of the first component 11a, and the gripping means 43 can be provided on the inner circular splicing element 12a of the second component 11b.

[0188] When the ends of the threads F1 and F2 are brought closer to each other, the first motor member 13 can command the components 11a and 11b to approach each other so that the surfaces of the two opposing splicing elements 12 are in complete contact. For example, in this case, the gripping means 43 is hidden within the thickness of the corresponding splicing elements 12a and 12b.

[0189] Thereafter, the control unit 29 commands the second motor member 14 to rotate the two components 11a and 11b in opposite directions and opposite to the previous rotation to twist the ends of the two threads F1 and F2 with respect to each other (FIGS. 8a to 8c).

[0190] The components 11a and 11b are then separated from each other using the first motor member 13 to take out the resulting thread F.

[0191] Figure 9 shows a modified example of the device 10 of the present invention. In this case, the motor member 13 can be a stepper motor and is configured to translate at least one of the two components 11, 11b in one direction or the opposite direction by means of a worm screw 48. Such a worm screw 48 can be associated, for example, with the component 11b having a corresponding nut for this purpose.

[0192] The motor member 13 can be provided with a position transducer 49 instead of or in combination with the first sensor means 27. Substantially, therefore, the device 10 of the present invention can be provided with the first sensor means 27, the position transducer 49, or a combination of both.

[0193] The motor member 14 for commanding the relative rotation of the two components 11a, 11b can be a stepper motor provided with a position transducer 50 instead of or in combination with the second sensor means 28 configured to detect the rotation angle of at least one of the components 11a, 11b. Substantially, therefore, the device 10 of the present invention can be provided with the second sensor means 28, the position transducer 50, or a combination of both.

[0194] As can be seen in the modified example of FIG. 4, the control unit 29 is associated with the motor members 13 and 14 and is configured to command the motor members 13 and 14 as a function of the functional parameters and the values detected by such position transducers 49 and 50 or encoders.

[0195] The position transducer can also be associated with other motor members present in the device 10 of the present invention.

[0196] For example, the third motor member 31 configured to drive the holding means 30 suitable for splicing the yarns F1, F2 and keeping them in a tensioned state in the splicing zone G can be provided with a position transducer or an encoder.

[0197] The fourth motor member 40 configured to drive the removing means 36 can also be provided with a position transducer or an encoder.

[0198] It is obvious that modifications and / or additions to the parts can be made to the splicing device 10 described above without departing from the field and scope of the present invention.

[0199] Also, although the present invention has been described with reference to several specific examples, it is obvious that those skilled in the art will surely be able to achieve many other equivalent forms of the device 10 that have the characteristics as described in the claims and thus all fall within the protection scope defined by the claims.

[0200] In the following claims, the reference signs in parentheses are for the sole purpose of making the reading easier and shall not be regarded as limiting elements with respect to the protection scope claimed in a particular claim.

Claims

1. A splicing device for splicing the ends of the fabric yarns (F1, F2) by using the decomposition and subsequent recomposition of the twists of the fibers at the opposing ends of two fabric yarns (F1, F2) to form a single reverse-rotating yarn (F), the splicing device (10) comprising two reverse-rotating components (11a, 11b), each of the reverse-rotating components comprising at least one splicing element (12), arranged opposite to each other and defining a splicing zone (G) between the respective splicing elements (12) which are substantially aligned along the operating axis (X) facing each other. The splicing device (10) is configured with one or more motor members (13, 14) for adjusting the width and size of the splicing zone (G) and selectively rotating the components (11a, 11b) relative to each other about the operating axis (X) to obtain the decomposition and subsequent recomposition of the twists of the fibers of the yarns (F1, F2), and for selectively moving at least one of the components (11a, 11b) along the operating axis (X). A third motor member (31) configured to drive holding means (30) suitable for keeping the yarns (F1, F2) in a tensioned state within the splicing zone (G), wherein the holding means (30) is movable from a non-operating position where the holding means (30) does not interfere with the splicing zone (G) to an operating position on both sides of the splicing zone (G) where the holding means (30) cooperates with the components (11a, 11b), and the third motor member (31) is configured to move at least the holding means (30) from the non-operating position to the operating position. The third motor member (31) A control unit (29) having an internal memory (44) containing a list of functional parameters of the two components (11a, 11b) for splicing the yarns (F1, F2), the control unit (29) being configured to control and command the one or more motor members (13, 14) and the third motor member (31) based on the functional parameters present in the internal memory (44). A splicing device, characterized by comprising the above.

2. The functional parameter includes at least the speed of movement of at least one of the components (11a, 11b) along the operating axis (X), the rotational speed of the component (11a, 11b), the type of fabric yarns (F1, F2) to be spliced, the axial force between the opposing components (11a, 11b), and / or the contact area within the splicing zone (G) between the opposing splicing elements (12). The splicing device according to claim 1, characterized in that.

3. The splicing device according to claim 1 or 2, characterized in that the one or more motor members (13, 14, 31) are electric of the stepper or brushless type.

4. At least one of the one or more motor members (13, 14, 31) is provided with a position transducer (49, 50), and the control unit (29) is configured to command the at least one motor member (13, 14, 31) as a function of the functional parameter and the value detected by the position transducer (49, 50). The splicing device according to claim 3, characterized in that.

5. Comprising first sensor means (27) configured to detect the movement of the two components (11a, 11b) towards and / or away from each other. The control unit (29) is configured to command the one or more motor members (13, 14, 31) as a function of the functional parameter and the value detected by the first sensor means (27). The splicing device according to any one of claims 1 to 4, characterized in that.

6. Comprising second sensor means (28) configured to detect the rotation angle of at least one of the components (11a, 11b). The control unit (29) is configured to command the one or more motor members (13, 14) as a function of the functional parameter and the value detected by the second sensor means (28). The splicing device according to any one of claims 1 to 5, characterized in that.

7. A first motor member (13) configured to selectively move at least one of the two components (11a, 11b) along the operating axis (X). A second motor member (14) configured to rotate the two components (11a, 11b) in opposite directions relative to each other around the operating axis (X). comprising the control unit (29) is configured to command the first motor member (13) and the second motor member (14) as a function of the functional parameter and the values respectively detected by the first sensor means (27) and the second sensor means (28); The splicing device according to claim 6, which cites claim 5.

8. comprising third sensor means (34) configured to detect the movement of the holding means (30) from the operating position to the non-operating position and vice versa; the control unit (29) is configured to command the third motor member (31) as a function of the functional parameter and the value detected by at least the third sensor means (34); The splicing device according to any one of claims 1 to 7.

9. comprising a fourth motor member (40) configured to drive removal means (36) suitable for removing the ends of the yarns (F1, F2) not required for splicing; the removal means (36) comprises a pair of gripping elements (37) aligned with each other and arranged on opposite sides of the splicing zone (G), and respective guide elements (38) associated with each gripping element (37) and configured to move each gripping element (37) parallel to the operating axis (X), the fourth motor member (40) being configured to move each gripping element (37) along the respective guide element (38) to a desired position for removing the ends of the yarns (F1, F2); The splicing device according to any one of claims 1 to 8.

10. comprising a pair of cutting elements (35) projecting in the radial direction from the frame (17) of at least one of the components (11a, 11b) and provided so as to be selectively removable from the frame (17), the cutting elements (35) rotating integrally with the components (11a, 11b) and being configured to cut the ends of the yarns (F1, F2) not required for splicing. The splicing device according to any one of claims 1 to 9.

11. One of the two components (11a, 11b) has a clamping-type gripping means (43) configured to selectively protrude from the splicing element (12) and to bring the two ends of the spliced yarns (F1, F2) closer to each other. The other of the two components (11a, 11b) is provided along the diameter of the respective splicing element (12) and is configured to cooperate with the gripping means (43), and has a plurality of holes (42) for introducing air into the splicing zone (G) or sucking air out of the splicing zone (G) to bring the two ends of the spliced yarns closer to each other and compress them. The splicing device according to any one of claims 1 to 10, characterized in that.

12. A splicing method for splicing the ends of the fabric yarns (F1, F2) using the decomposition and subsequent recombination of the twists of the fibers at the opposing ends of the two fabric yarns (F1, F2) to form a single yarn (F). A step of introducing two spliced yarns (F1, F2) between two components (11a, 11b), each having at least one splicing element (12), arranged opposite to each other, aligned along the operating axis (X) and facing each other, and defining a splicing zone (G) between the respective splicing elements (12). A step of bringing the two components (11a, 11b) closer to each other along the operating axis (X) until there is at least partial contact between the opposing splicing elements (12). A step of rotating the two components (11a, 11b) in opposite directions to bring the two yarns (F1, F2) closer to each other and parallel within the splicing zone (G). A step of removing the end portions of the yarns (F1, F2) that do not contribute to the splicing and obtaining the two ends of the two spliced yarns (F1, F2). A step of bringing the two ends of the two spliced yarns (F1, F2) closer to each other until they substantially overlap. A step of reversely rotating the two components (11a, 11b) in opposite directions to twist the opposing ends of the two yarns (F1, F2) to generate a single yarn (F). Furthermore, it includes the step of making available in the internal memory (44) of the control unit (29) a list of the functional parameters of the said components (11a, 11b) for joining the fabric threads, the said control unit (29) being configured to command and control, as a function of the said functional parameters, one or more motor members (13, 14) assigned to perform the steps of introducing the fabric threads into the said joining zone (G), bringing the two said components (11a, 11b) closer to each other, rotating the two said components (11a, 11b), removing the said end portions of the threads (F1, F2), bringing the said end portions of the obtained threads (F1, F2) closer to each other, and rotating the two said components (11a, 11b) in reverse. The control unit (29) commands and controls a third motor member (31), as a function of the said functional parameters, to drive holding means (30) so as to keep the threads in a tensioned state within the said joining zone (G). The holding means (30) is movable from a non-operating position where the holding means (30) does not interfere with the joining zone (G) to an operating position on both sides of the joining zone (G) where the holding means (30) cooperates with the said components (11a, 11b), and the third motor member (31) is configured to move at least the holding means (30) from the non-operating position to the operating position. A joining method, characterized in that.

13. The step of detecting and monitoring the movement along the said operating axis (X) of at least one of the said components (11a, 11b). The step of detecting the rotation around the said operating axis (X) of at least one of the said components (11a, 11b) during the said rotation and reverse rotation. Including The control unit (29) commands and controls the functions of the said one or more motor members (13, 14, 31) based on the said functional parameters stored in the internal memory (44) and on the parameters detected in the said detecting step. A joining method according to claim 12, characterized in that.

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