Clamping frame, drawing-in machine comprising clamping frame and drawing-in method using clamping frame

Abstract

The clamping frame includes first and second side posts (642, 644) and upper and lower clamping rails (646, 648). Each side post includes a mandrel (652, 654) having a threaded outer surface. The clamping frame includes two primary nuts (662, 664) in threaded engagement with one of the threaded outer surfaces. At least a first clamping rail is connected to the two primary nuts (662, 664). The primary drive (800) includes two primary actuators (802, 804) configured to induce relative rotation between the primary nut and the spindle. The position of the second clamping rail is not changed by relative rotation between each main nut and the corresponding mandrel. In a configuration in which the upper and lower clamping rails (646, 648) define a maximum value of the spacing distance (d6) therebetween, the first clamping rail (646, 648) is movable relative to each mandrel to reduce the spacing distance (d6) to a value strictly less than half the maximum value. The clamping frame includes a controller for controlling the two main actuators (802, 804).

Description

Technical Field

[0001] This invention relates to a clamping frame for holding warp yarns of at least one yarn layer. The invention also relates to a warping machine and a warping method for threading warp yarns of at least one yarn layer into a heald frame. This invention belongs to the field of preparing heald frames for looms. Background Technology

[0002] As is well known, during the preparation of the heald frame, a clamping frame is used to clamp the warp yarns of at least one yarn layer obtained from the warp beam.

[0003] Against this backdrop, EP4033021A1 discloses a clamping frame formed by an upper clamping track, a lower clamping track, and two lateral side posts. This clamping frame is generally satisfactory. The lower clamping track is mounted on the side posts and has no possibility of relative movement, while the upper clamping track can move relative to the lateral posts along a vertical axis. The two clamping tracks remain parallel to each other. The tensioning device includes rotating mandrels, each threadedly engaged with a nut, which causes the upper clamping track to move vertically to adjust its position relative to the lower clamping track and thus adjust the tension of the clamped yarn. This tension cannot be automatically and / or locally adjusted during warping. Furthermore, the position of the clamping tracks relative to the floor cannot be adjusted during warping. When it is necessary to remove the heald frame, i.e., after all warp yarns have been warped, the lower clamping track is positioned between the heald frame elements and the warp beam. Therefore, the removal operation involves several relatively complex steps.

[0004] On the other hand, CN206089969U discloses a clamping frame that can move laterally relative to the support track. This allows for the quick removal of the weaving heald frame after warping is complete. This lateral movement must be implemented in addition to any movement that affects the tension of the yarn layers before warping. Summary of the Invention

[0005] This invention aims to solve these problems by providing a clamping frame that allows for a wide range of precise adjustments to the position of its clamping track relative to its side posts. This makes yarn layer tensioning, yarn threading, and unwinding more efficient.

[0006] In this regard, the present invention relates to a clamping frame for clamping warp yarns of at least one yarn layer, the clamping frame comprising at least:

[0007] -First side column and second side column;

[0008] - An upper clamping track and a lower clamping track, the upper clamping track and the lower clamping track being configured to clamp warp yarns of at least one yarn layer, a first side post and a second side post mechanically connecting the upper clamping track and the lower clamping track together, the upper clamping track and the lower clamping track extending between the first side post and the second side post and spaced apart along a transverse axis.

[0009] According to the present invention

[0010] - The first side post includes a first mandrel having a first threaded outer surface centered on a first longitudinal axis;

[0011] - The second side post includes a second mandrel having a second threaded outer surface centered on a second longitudinal axis;

[0012] - Both the first and second longitudinal axes are parallel to the transverse axis, have fixed positions relative to each other, and together define the principal plane;

[0013] - The clamping frame includes two main nuts, each of which engages with a thread on a first threaded outer surface and a second threaded outer surface, respectively;

[0014] - At least one of the upper and lower clamping rails is mechanically connected to the two main nuts such that movement of each main nut relative to the corresponding spindle in a direction parallel to the transverse axis causes the first clamping rail to move relative to the corresponding spindle in a direction parallel to the transverse axis, and the first clamping rail cannot translate relative to the main nut along an axis perpendicular to the main plane.

[0015] - The clamping frame includes a main drive unit, which includes two main actuators, each of which is configured to cause a corresponding main nut and a corresponding spindle to rotate relative to each other about a corresponding first longitudinal axis or a second longitudinal axis.

[0016] - The relative rotation between each main nut and the corresponding spindle does not change the position of the second clamping track in the upper and lower clamping tracks relative to the first and second spindles along the transverse axis;

[0017] -Starting from a configuration in which the positions of the upper and lower clamping tracks relative to the first and second mandrels along the transverse axis define the maximum value of the spacing distance between the upper and lower clamping tracks along the transverse axis, the first clamping track may be moved relative to each mandrel along the transverse axis to reduce the spacing distance to a value strictly less than half of the maximum value of the spacing distance.

[0018] - The clamping frame includes a controller for controlling two main actuators.

[0019] Because of this invention, the two main actuators of the main drive unit are dedicated to the first clamping track, and the engagement between the two main nuts and the two spindles allows for fine-tuning of the position of the first clamping track along the transverse axis over a wide range. This provides the clamping frame with ergonomic advantages. Furthermore, since the controller controls the two first actuators, it is possible to fine-tune the position of the first clamping track along the transverse axis during the threading process.

[0020] According to advantageous and optional aspects of the invention, this clamping frame can incorporate one or more of the following features:

[0021] Each main nut is mounted on a main support member, but there is no possibility of translational movement between the main nut and the main support member in any direction parallel to or perpendicular to the transverse axis. Each main support member cooperates with a guide member of an adjacent side post, the guide member extending parallel to the transverse axis and preventing rotation of the main support member about its corresponding longitudinal axis. Each longitudinal end of the first clamping track is hinged to a main support member, allowing the longitudinal axis of the first clamping track to tilt relative to the transverse axis. Due to this aspect of the invention, the two longitudinal ends of the first clamping track can be driven individually by one of the first actuators, and the tilting of the first clamping track allows adjustment of tension in the yarn layer along the direction of the main longitudinal axis. The side posts and clamping tracks form a deformable quadrilateral having at least two angles that are variable.

[0022] - The hinge axis of one longitudinal end of the first clamping track relative to the corresponding main support is perpendicular to the main plane and stationary relative to the first clamping track and the corresponding main support. The other longitudinal end of the first clamping track includes a hinge recess that engages with a cylindrical pin of the corresponding main support in a direction parallel to the transverse axis. The cylindrical pin is centered on the hinge axis perpendicular to the main plane, and the hinge recess is rectangular, having a larger dimension in the direction parallel to the longitudinal axis of the first clamping track.

[0023] Each main nut is mechanically connected to the first clamping rail and has the possibility of relative rotation about a corresponding first longitudinal axis or a second longitudinal axis; each main actuator is fixed to the corresponding main nut at least along the transverse axis, and each main actuator is configured to rotate the corresponding main nut about the corresponding longitudinal axis relative to the first clamping rail and the corresponding mandrel. The main drive moves together with the first clamping rail, thereby providing greater flexibility in the positioning of the first clamping rail relative to the second clamping rail.

[0024] The main drive unit includes at least one brake configured to selectively prevent relative rotation between the main nut and the corresponding spindle. The brake has safety features and prevents undesirable movement of the first clamping rail.

[0025] The first and second mandrels are fixed to the mounting base of the side column, preventing them from rotating about the corresponding first or second longitudinal axis. Due to this aspect of the invention, the mandrels are fixed about the first and second longitudinal axes, providing greater rigidity to the clamping frame.

[0026] A second clamping track is mechanically connected to two secondary nuts, each of which engages with a thread on one of the first and second threaded outer surfaces, respectively. The second clamping track is mechanically connected to the two secondary nuts such that movement of the secondary nuts relative to their respective spindles in a direction parallel to the transverse axis causes movement of the second clamping track relative to the respective spindles in the same direction, and the second clamping track does not have the possibility of translational movement relative to the secondary nuts along an axis perpendicular to the main plane. The clamping frame includes a secondary drive mechanism comprising at least one secondary actuator configured to at least cause relative rotation between the secondary nuts and the respective spindles about a respective first or second longitudinal axis. The first and second threaded outer surfaces extend continuously from the respective main nuts to the respective secondary nuts, and a controller is configured to control at least one secondary actuator. Due to this aspect of the invention, the second clamping track can also move relative to the spindles along the first and second longitudinal axes. This provides greater flexibility to the clamping frame, allowing it to be adapted to various usage configurations. For compactness, the same spindle engages with both the main and secondary nuts.

[0027] The clamping frame also includes an outer frame having two vertical supports configured on the ground. A first and second side post, along with an upper and lower clamping rail, are mounted on the outer frame and positioned between the two vertical supports. The main plane has the capability to tilt relative to the two vertical supports about a pivot axis. The pivot axis is perpendicular to the transverse axis and is fixed relative to the outer frame, located between the ground and the lower clamping rail along the transverse axis. The tilting capability of the main frame, and therefore the side posts and the two clamping rails, allows the clamping rails to tilt together with a small force in a variable manner relative to the outer frame, either forward or backward, to suit cooperation with the threading unit.

[0028] The clamping frame includes an upper crossbeam that extends above the upper clamping track when the upper clamping track is positioned relative to the first and second mandrels along the transverse axis at its maximum value, defining the spacing between the upper and lower clamping tracks. The upper crossbeam is equipped with connecting devices for connection to the threading unit and / or another clamping frame. The connection between the clamping frame and the threading unit, or between the clamping frame and another clamping frame, does not restrict ergonomics, particularly during the threading and unthreading phases performed using the clamping frame.

[0029] The clamping frame includes at least one sensor configured to detect the relative position between the nut and the corresponding mandrel, the sensor being connected to a controller. The sensor provides the possibility of remembering specific positions of the nut along the longitudinal axis of the corresponding mandrel and controlling the actuator to quickly, accurately, and reliably reach those positions.

[0030] - The first clamping rail is the lower clamping rail, and the volume defined between the first and second side posts and located below the lower clamping rail has no crossbeams mechanically connected to the first and second side posts or cables extending between the first and second side posts. The free volume defined below the lower clamping rail facilitates the movement of the warp-threading unit, operator, and / or weaving heald frame along and through the clamping frame. The height of this volume can be increased by raising the lower clamping rail. If only one clamping rail is movable relative to the side posts along the mandrel, then that movable clamping rail is advantageously the lower clamping rail, in order to allow for an increase in the height of the free volume.

[0031] The clamping frame includes a carriage removably mounted on a first clamping track and configured to support a weaving heald frame, such that the weaving heald frame moves along a transverse axis relative to a first and second mandrel via a main drive mechanism, together with the first clamping track. During removal, the carriage supporting the weaving heald frame can be lifted by the clamping frame for greater ergonomics.

[0032] According to a second aspect, the present invention relates to a warp-threading machine for threading warp yarns from at least one yarn layer into a heald frame, the warp-threading machine comprising:

[0033] - At least one clamping frame as described above;

[0034] - A warp-threading unit, wherein the warp-threading unit is equipped with at least:

[0035] ○ Yarn separating device, the yarn separating device being configured to separate warp yarns from at least one yarn layer held in a clamping frame;

[0036] ○ Threading device, which is configured to thread each separated warp yarn through the heald frame.

[0037] This warp threading machine incorporates the advantages of the clamping frame described above.

[0038] According to a third aspect, the present invention relates to a warp-threading method for threading warp yarns from at least one yarn layer into a heald frame, the warp-threading method using:

[0039] -The clamping frame as described above, and

[0040] - A warp-threading unit, wherein the warp-threading unit is equipped with at least:

[0041] ○ A yarn separating device, configured to separate warp yarns from at least one yarn layer held in a clamping frame; and

[0042] ○ Threading device, configured to thread each separated warp yarn through the heald frame.

[0043] Moreover, the method includes at least the following consecutive steps:

[0044] a) Prepare at least one layer of yarn from the warp beam by clamping the warp yarns on the upper and lower clamping tracks of the clamping frame;

[0045] b) Passing warp yarns from at least one yarn layer into the heald frame; and

[0046] c) The warp-threaded heald frame (8) is removed by moving it toward the warp beam (B) along a direction (D12) perpendicular to the vertical axis (Z6) and the main horizontal longitudinal direction (A6) of the clamping frame (6).

[0047] The controller of the clamping frame controls at least two master actuators to position the first clamping track at a first position along the transverse axis during one of steps a), b), or c), and to position the first clamping track at a second position along the transverse axis during another of steps a), b), or c), the first position and the second position being different positions and each defined according to the position of each master nut relative to the corresponding spindle along the transverse axis.

[0048] This method is particularly effective for preparing heald frames for weaving.

[0049] Advantageously, the controller of the clamping frame includes a memory; several different dedicated positions of the first clamping rail are stored in the controller's memory, each of said dedicated positions being defined according to the position of each master nut relative to the corresponding mandrel along the transverse axis, and the controller controls at least two master actuators to position the first clamping rail in one of the dedicated positions. Remembering the different dedicated positions makes the method faster.

[0050] According to another optional aspect, the warp-threading unit is equipped with a yarn separation detection device, which is connected to a controller and configured to detect the result of yarn separation performed by the yarn separation device; during step b), the controller controls at least one of the main actuators according to a signal received by the controller from the yarn separation detection device to adjust the position of the first clamping track relative to the first and second mandrels along the transverse axis. Due to this aspect of the invention, particularly during step b), yarn separation can be improved in real time by taking into account the result of each action of the yarn separation device. Attached Figure Description

[0051] The invention will be better understood based on the following description given by way of non-limiting example and with reference to the following figures:

[0052] Figure 1 This is a front view of the clamping frame in a ready configuration according to the first embodiment of the present invention;

[0053] Figure 2 yes Figure 1 A side view of the clamping frame, wherein the left vertical support is indicated by a dashed line to show the other components of the clamping frame;

[0054] Figure 3 yes Figure 2 and Figure 3 Rear view of the clamping frame;

[0055] Figure 4 It is along Figure 3 An enlarged partial sectional view taken by line IV-IV in the middle;

[0056] Figure 5 yes Figures 1 to 4 A perspective rear view of the clamping frame;

[0057] Figure 6 The corresponding view from another perspective Figure 5 Detail VI on Figures 1 to 5 A partial perspective view of the clamping frame;

[0058] Figure 7 It is along Figure 5 The line VII-VII intercepted on the top Figures 1 to 6 A cross-sectional view of the clamping frame;

[0059] Figure 8 yes Figure 7 A magnified view of details on VIII;

[0060] Figure 9 yes Figure 7 A magnified view of the details on IX;

[0061] Figure 10 It is when the clamping frame is in the through-wire configuration and Figure 2 Similar side view;

[0062] Figure 11 Is with Figure 1 A similar front view shows the tilt of the clamping track;

[0063] Figure 12 It is at the beginning of the demolition phase and Figure 2 Similar side view;

[0064] Figure 13 It is at the end of the demolition phase and Figure 2 Similar side view;

[0065] Figure 14 This is a rear view of the clamping frame according to a second embodiment of the present invention;

[0066] Figure 15 It is along Figure 14 A horizontal sectional view taken from the XV-XV line; and

[0067] Figure 16 This is for the clamping frame according to the third embodiment of the present invention and Figure 7 Similar sectional views. Detailed Implementation

[0068] exist Figure 10 The diagram shows a warp threading machine 2 according to the present invention, which, among other things, also includes a warp threading unit 4 and a clamping frame 6. The clamping frame 6 also... Figures 1 to 9 and Figures 11 to 13 As shown in the image.

[0069] exist Figure 1 The front side of the clamping frame 6 is visible in the middle and... Figure 3 and Figure 5 The rear side of the clamping frame is visible. When warp passing occurs, the front side of the clamping frame faces the warp passing unit, while the rear side of the clamping frame faces the warp beam B.

[0070] The warp-threading unit 4 includes a unit controller 42 and a yarn separation device 44, such as the yarn-absorbing device known in WO02088445A2, configured to separate the warp yarn Y from the yarn layer L1. The warp-threading unit 4 also includes a yarn detection device 46, such as a camera, configured to detect the yarn separation result performed by the yarn separation device 44. Specifically, the yarn separation detection device 46 can detect whether the yarn separation device 44 has separated a single warp yarn from the yarn layer L1.

[0071] The warp-threading unit 4 also includes a threading device (not shown) configured to thread the separated warp yarns through elements of the heald frame 8. These elements include, for example, stop warp pieces (such as...). Figure 10 , Figure 12 and Figure 13 The menstrual pads (as shown in group 82), heddles (as shown in group 84), and / or reeds (as shown in group 84) are included.

[0072] The clamping frame 6 also includes a carriage 10, which is removably mounted on the clamping rail 646 or clamping rail 648 and configured to support the weaving heald frame 8 after the elements of the weaving heald frame 8 have been threaded with the separated yarn Y. Figure 12 As shown.

[0073] The threading machine 2 also includes a conveying device (not shown) for moving the threading unit 4 relative to the clamping frame 6 in a longitudinal direction parallel to the main longitudinal axis A6 of the clamping frame 6.

[0074] exist Figures 1 to 13 In the first embodiment of the present invention shown, the clamping frame 6 stands on the surface S of the floor G of the tunneling chamber, only as shown Figure 1 As shown.

[0075] The clamping frame 6 includes an outer frame 62 fixed to the ground G during the passage. In other words, the outer frame 62 is stationary within the passage chamber during the passage. The outer frame 62 includes a left vertical support 622, a right vertical support 624, and a horizontal upper beam 626 extending parallel to the main longitudinal axis A6 from the left vertical support 622 to the right vertical support 624. The outer frame 62 does not include a lower beam extending between the two vertical supports 622, 624 to near the ground G.

[0076] Relative to the main longitudinal axis A6 and Figure 1 The orientation is limited to the right and left directions.

[0077] Each vertical bracket 622 or vertical bracket 624 is provided with a lower base 628, secured by a fixing device (e.g., only such as Figure 1 and Figure 2 The screw (represented by longitudinal axis 629) is fixed to the ground G.

[0078] The outer frame 62 supports the sub-frame 64, the controller 66, and the display screen 68.

[0079] Advantageously, the controller 66 is formed of a printed circuit board, which houses electronic components and is integrated within one of the vertical brackets 622, 624, in the example of the figures, integrated into the left vertical bracket 622. The display screen 68 may be located on the outer surface of one of the vertical brackets 622, 624, for example, on the outer front surface of the left vertical bracket 622 in the example of the figures. For simplicity, only... Figure 1 , Figure 6 and Figure 10 The controller 66 and the display screen 68 are shown in the figure.

[0080] The controller 66 includes a memory 166 for storing data corresponding to certain positions of certain elements of the clamping frame 6, as described below.

[0081] The display screen 68 allows the operator to monitor the operation of the clamping frame 6 and the possible threading unit 4. The display screen may be a touch screen, which allows the operator to issue commands to the controller 66 through the display screen.

[0082] Subframe 64 includes a left column 642 and a right column 644. The left column 642 and the right column 644 form the first side column and the second side column, respectively, and are parallel to each other.

[0083] B6 represents the transverse axis of the clamping frame 6, which is perpendicular to the main longitudinal axis A6, and... Figures 1 to 13 In the example, the entire structure is vertical. "Entirely vertical" means that the transverse axis B6 is vertical or slightly inclined relative to the vertical axis Z6. "Slightly inclined" means that the transverse axis B6 can be inclined at a maximum of 3°, preferably at a maximum of 10°, towards the front of the clamping frame 6, or at a maximum of 8°, preferably at a maximum of 10°, towards the rear of the clamping frame 6. Figures 1 to 9 In this configuration, the transverse axis B6 is completely vertical. Figure 10 In the illustrated thread-through configuration, the transverse axis B6 is tilted towards the front of the clamping frame 6 relative to the vertical axis Z6. In practice, the orientation of the transverse axis B6 can be adjusted, and this transverse axis can be tilted forward or backward, specifically at an angle of + / -3°. Figure 10 The configuration shown is one of the possible warp-threading configurations for warp-threading machine 2. Figure 12 and Figure 13 In the configuration, the transverse axis B6 is inclined toward the rear side of the clamping frame 6 relative to the vertical axis Z6.

[0084] Subframe 64 also includes an upper clamping track 646 and a lower clamping track 648. The lower clamping track 648 extends closer to the ground G relative to the vertical axis Z6 than the upper clamping track 646. Each clamping track 646 or clamping track 648 extends between a first side post 642 and a second side post 644 along a corresponding longitudinal axis A646 or longitudinal axis A648. The first side post 642 and the second side post 644 mechanically connect the upper clamping track 646 and the lower clamping track 648 together.

[0085] Generally, axes A6, A646, and A648 are parallel as a whole, that is, parallel or forming an angle of less than 10° between them. Figures 1 to 10In the configuration, axes A6, A646, and A648 are parallel. However, as... Figure 11 As shown and explained below, axes A6, A646, and A648 may also be slightly tilted or skewed relative to each other. Preferably, each of axes A646 and A648 may be tilted + / - 5° from the horizontal direction.

[0086] The upper clamping track 646 and the lower clamping track 648 are spaced apart along the transverse axis B6 by a distance d6 measured parallel to the transverse axis. The distance d6 is the transverse span between the two clamping tracks at a given longitudinal level along the main longitudinal axis A6 (e.g., at the midpoint between the two side posts 642, 644).

[0087] The left side post or first side post 642 includes a first rod 651 and a first spindle 652 that are parallel to each other. The first spindle 652 extends along a first longitudinal axis B652 that is parallel to the transverse axis B6.

[0088] On the other hand, the right-side post or second side post 644 includes a second rod 653 and a second spindle 654 that are parallel to each other. The second spindle 654 extends along a second longitudinal axis B654, which is always parallel to the first longitudinal axis B652.

[0089] The first longitudinal axis B652 and the second longitudinal axis B654 have fixed positions relative to each other. The first longitudinal axis and the second longitudinal axis are offset along the main longitudinal axis A6 and together define the main plane P6 of the clamping frame 6. The transverse axis B6 is contained within the main plane P6 and is parallel to the first longitudinal axis B652 and the second longitudinal axis B654, and is located at the midpoint between the two longitudinal axes.

[0090] The left vertical support 622 and the right vertical support 624 of the outer frame 62, as well as the first rod 651 and the second rod 653, are located outside the volume defined between the first longitudinal axis B652 and the second longitudinal axis B654.

[0091] Each side post 642 or 644 also includes a lower mounting base 656 and an upper mounting base 658. Each spindle 652 or 654 extends from the lower mounting base 656 to the upper mounting base 658 of the corresponding side post 642 or 644, and the spindle is rotationally locked with these mounting bases and adjacent rods 651 or 653 about a corresponding first longitudinal axis B652 or second longitudinal axis B654 and along a transverse axis B6. Rotational locking of the spindle 652 or 654 with adjacent rods 651 or 653 about a corresponding first longitudinal axis B652 and second longitudinal axis B654 is achieved by a locking pin 660 extending through each lower mounting base 656 and through the corresponding spindle 652 or 654 engaged in that lower mounting base 656. The lower mounting base 656, the upper mounting base 658, and the first rod 651 and second rod 653 of the clamping frame 6 cannot move relative to each other.

[0092] In a variant of the invention not shown, a locking pin 660 may be provided at the level of the upper mounting base 658, or two locking pins may be provided at the level of both the lower mounting base and the upper mounting base.

[0093] Between the two mounting bases 656, 658, a linear track 666 is formed along each side post 642 or 644 and extends parallel to the transverse axis B6. Each linear track 666 forms a guide member belonging to the rod 651 or 653 of the side post 642 or 644 and rotates around the corresponding first longitudinal axis B652 and second longitudinal axis B654.

[0094] Advantageously, the linear track 666 is disposed on the outside of the first rod 651 or the second rod 653 and extends on the outside between the rod and the adjacent spindle 652 or spindle 654 and along the main longitudinal axis A6.

[0095] Advantageously, the linear track 666 extends along the entire length of the first rod 651 or the second rod 653 obtained along the transverse axis B6.

[0096] Advantageously, the first mandrel 652 and the second mandrel 654 are identical. Therefore, the description of one of these mandrels also applies to the other mandrel.

[0097] The first spindle 652 has a continuously threaded outer surface S652 centered on the first longitudinal axis B652, while the second spindle 654 has a continuously threaded outer surface S654 centered on the second longitudinal axis B654. The corresponding continuously threaded outer surfaces S652 and S654 have a constant pitch.

[0098] Because of the locking pin 660, the threaded outer surfaces S652 and S654 cannot rotate about the first longitudinal axis B652 and the second longitudinal axis B654 respectively, and in particular, cannot rotate about the first longitudinal axis and the second longitudinal axis relative to the mounting bases 656, 658 and the outer frame 62.

[0099] A first master nut 662 is mounted around a first spindle 652 and threadedly engages with the threaded outer surface S652 of the first spindle. A first longitudinal axis B652 is the axis of rotation of the first master nut 662 relative to the first spindle 652. The first master nut 662 is fixed to the first spindle 652 in all directions perpendicular to the first longitudinal axis B652.

[0100] The second main nut 664 is mounted around the second spindle 654 and threadedly engages with the threaded outer surface S654 of the second spindle. The second longitudinal axis B654 is the axis of rotation of the second main nut 662 relative to the second spindle 654. The second main nut 664 is fixed to the second spindle 654 in all directions perpendicular to the first longitudinal axis B654.

[0101] Advantageously, the main nuts 662 and 664 are the same.

[0102] Generally, the threaded outer surface S652 extends continuously from the level of the first main nut 662 to the level of the lower clamping track 648 at all positions on the first spindle 652 and along the first longitudinal axis B652. Similarly, the threaded outer surface S654 extends continuously from the level of the second main nut 664 to the level of the lower clamping track 648 at all positions on the second spindle 654 and along the second longitudinal axis B654. Unless otherwise specified, "level" corresponds to the height measured from the surface S of the ground G parallel to the vertical axis Z6.

[0103] L6 represents the length of mandrel 652 or mandrel 654 measured along its own longitudinal axis B652 or longitudinal axis B654. Length L6 is 0.9 to 1.1 times the length of the side posts 642, 644 along the transverse axis B6. Advantageously, the continuous threaded outer surfaces S652, S654 of the mandrel extend over at least 90%, preferably at least 95%, of the length L6 of the mandrel. Preferably, the continuous threaded outer surfaces S652, S654 of the mandrel extend along the transverse axis B6 over at least 90% of the length of the side posts 642, 644, respectively.

[0104] Each main nut 662 or main nut 664 can move longitudinally along the first longitudinal axis B652 or the second longitudinal axis B654 via the relative rotation between each main nut and the corresponding spindle.

[0105] The amplitude or range of the movement depends on the length of the threaded outer surfaces S652, S654. Since each of these threaded outer surfaces extends at least between the main nut 662 or the main nut 664 and the lower clamping rail 648, preferably at least 90% of the length L6, the amplitude or range of the movement is close to the total length L6 of the mandrel.

[0106] Each main nut 662 or 664 is mounted on a corresponding main support member, wherein the nut and the corresponding main support member are not capable of translational movement in any direction parallel to the transverse axis B6 or in any direction perpendicular to the transverse axis B6. More precisely, the first main nut 662 is fixed to the first main support member 672 in a direction parallel to the transverse axis B6, and the first main nut 662 is capable of rotating relative to the first main support member 672 about the first longitudinal axis B652. Furthermore, the second main nut 664 is fixed to the second main support member 674 in a direction parallel to the transverse axis B6, and the second main nut 664 is capable of rotating relative to the second main support member 674 about the second longitudinal axis B654.

[0107] The left and right longitudinal ends of the upper clamping track 646 are hinged to the first main support 672 and the second main support 674, respectively. The upper clamping track 646 does not have the possibility of translational movement relative to the first main nut 662 and the second main nut 664 along an axis perpendicular to the main plane P6.

[0108] Each clamping track 646 or clamping track 648 is equipped with a clamping profile 676 extending parallel to the longitudinal axis A646 or longitudinal axis A648. The only possible movement of the clamping profile 676 relative to the clamping track 646 or clamping track 648 is along the longitudinal axis A646 or longitudinal axis A648. Preferably, as described in the first embodiment, the clamping profile 676 has no possibility of movement relative to the clamping track 646 or clamping track 648. Each clamping profile 676 receives a clamping rod 678. Each clamping track 646 or clamping track 648 is configured to clamp the yarn Y of the yarn layer L1 within the corresponding clamping profile 676 by means of the clamping rod 678. The teachings of EP4033021A1 can be used for the construction and use of the clamping tracks 646, 648.

[0109] The two main support members 672 and 674 are symmetrical about each other with respect to a plane that is perpendicular to the main longitudinal axis A6 and includes the transverse axis B6.

[0110] The first main support member 672 will be described below. Its description can be transferred to the second main support member 674 by means of symmetry.

[0111] The first main support member 672 includes an L-shaped armature 722, which supports a grooved slide rail 724 on one of its outer surfaces. Figure 4 A groove for another support member 1674 can be seen. The groove of the slide rail 724 is configured to receive the linear track 666, and the slide rail 724 can slide along the linear track in a direction parallel to the transverse axis B6. Therefore, the first main support member 672 is guided along the linear track 666, in a direction parallel to the transverse axis B6 and the first longitudinal axis B652. The corresponding shapes of the linear track 666 and the slide rail 724 allow the first main support member 672 to move relative to the first side post 642 only parallel to the axis B6 and the first longitudinal axis B652. In particular, the first main support member 672 is prevented from rotating relative to the first rod 651 about an axis parallel to the transverse axis B6 (e.g., the first longitudinal axis B652 or the longitudinal axis B653 of the second rod 653).

[0112] The principal plane P6 is the symmetric plane of the groove of slide rail 724 and linear track 666.

[0113] The first main support member 672 also includes a transverse planar bracket 726, which is perpendicular to the first longitudinal axis B652. The parallelepiped box 728 fixed on the bracket 726 also belongs to the first main support member 672.

[0114] The first main actuator 802 is fixed to the first main support member 672 at least along the transverse axis B6. In other words, the first main actuator 802 and the first main support member 672 move together parallel to the transverse axis B6.

[0115] The first main actuator 802 includes an electric motor 806, a belt 807, and a pulley 808 that is fixedly and rotatably connected to a first main nut 662. 806A and 806B represent the output shaft and spline head of the electric motor 806, respectively, forming a movable portion of the electric motor 806. The fixed portion of the electric motor 806 is fixed to the first main support member 672 in various directions, for example, by screws. The output shaft 806A of the electric motor 806 extends parallel to the first longitudinal axis B652 and, together with the spline head 806B, rotates relative to the first main support member 672 about an axis parallel to the transverse axis B6.

[0116] Output shaft 806A and spline 806B allow electric motor 806 to drive belt 807 when electric motor 806 is energized. Therefore, first master actuator 802 is configured such that first master nut 662 rotates relative to first spindle 652 about first longitudinal axis B652.

[0117] For example, Motor 806 is a stepper motor. Other types of motors can also be considered.

[0118] The first master brake 902 is also mounted on the first master support 672 and includes a splined shaft 906 mounted around a spindle 652 and a first jaw 907 fixedly rotatable to the splined shaft 906. The first jaw 907 forms a brake plate. Advantageously, the first jaw 907 is provided with an internal spline 907A, which engages with the external spline 906A of the splined shaft, thereby fixing components 906 and 907 together and allowing them to rotate about a first longitudinal axis B652.

[0119] The first master brake 902 also includes a second jaw 908, which is fixed to the main support 672 to rotate about a first longitudinal axis B652 and move axially relative to the main support 672 along the axis. The movement of the second jaw along the first longitudinal axis B652 is controlled by a coil (not shown).

[0120] The bearing 909 holds the splined shaft 906 within the housing 728 and has the possibility of rotating about the first longitudinal axis B652.

[0121] The first spindle 652 passes through the nut 662, the splined shaft 906, the bracket 726, the first jaw 907, the second jaw 908, and the bearing 909.

[0122] The first main nut 662, pulley 808, and spline shaft 906 are fixed by a plurality of screws 910 to rotate around and translate along the first longitudinal axis B652. Therefore, under the action of the electric motor 806 and belt 807 of the first main actuator 802, when the main nut 662 and spline shaft 906 are driven by the pulley 808, the main nut and spline shaft will rotate together around the first longitudinal axis B652.

[0123] By default, when the coil of the first master brake 902 is not energized, the first jaw 907 is clamped by the movable jaw 908, and the first master brake 902 prevents relative rotational movement between the first jaw 907 and the movable jaw 908, thereby preventing relative rotational movement between the spline shaft 906 and the first main support 672 about the first longitudinal axis B652. An elastic member (e.g., a spring, not shown) pushes the second jaw 908 against the first jaw 907, thereby preventing the first jaw 907 from rotating about the first longitudinal axis B652 in the absence of power. In other words, the second jaw 908 is configured to move from a disengaged position to an engaged position via the elastic member, in which the elastic member allows the first jaw 907 to rotate relative to the main support 672 about the first longitudinal axis B652, and in which the elastic member holds the first jaw 907 and the main support 672 together about the first longitudinal axis B652. As a result, the first main nut 662, connected to the first jaw 907 by screw 910, is also prevented from rotating about the first longitudinal axis B652 by the splined shaft 906 and screw 910. Therefore, due to the connection between the first main nut 662 and the adjacent splined shaft 906, in the event of power failure, the first main brake 902 selectively prevents the first main nut 662 from rotating relative to the first spindle 652 about the first longitudinal axis B652. In other words, the brake 902 selectively prevents relative rotation between the first main nut 662 and the first spindle 652.

[0124] Position sensor 912 is mounted around the first master nut 662 and allows determination of the instantaneous angular position of the first spindle 652 and the first master nut 662 about the first longitudinal axis B652.

[0125] For example, position sensor 912 is a resolver. The position sensor is connected to electrical signal transmission line L914 via connector 914, which transmits the output signal S912 of position sensor 912 to controller 66.

[0126] The controller 66 is connected to the first master actuator 802 via the second signal transmission line L802. The controller 66 sends the control signal S802 of the first master actuator 802 to the first master actuator 802 via the signal transmission line.

[0127] In addition, the third signal transmission line L902 connects the controller 66 to the first master brake 902 and allows the transmission of control signals S902 for the first master brake 902, particularly for the power supply of the coil of the first master brake.

[0128] The left end of the upper clamping track 646 is mechanically connected to a first main support 672 near the left side or first side post 642 via a cylindrical pin 686, specifically to a pivot 722 of the first main support 672. The cylindrical pin 686 is press-fitted into the pivot 722 of the first main support 672, and a screw 687 screwed into the cylindrical pin 686 secures the upper clamping track 646 and the first main support 672 together along a lateral axis C6 perpendicular to the principal plane P6. A hinge recess 696 is provided at the left end of the upper clamping track 646, and this hinge recess receives the cylindrical pin 686. A686 represents the central axis of the cylindrical pin 686, which forms the hinge axis of the first main support 672 relative to the upper clamping track 646. The hinge axis A686 is parallel to the lateral axis C6. The hinge axis A686 is stationary relative to the first main support 672.

[0129] The second main support member 674 is composed of components 722, 724, 726, and 728, which are similar to those of the first main support member 672. The second main actuator 804 is fixed to the second main support member 674 at least along the transverse axis B6. In other words, the second main actuator 804 and the second main support member 674 move together parallel to the transverse axis B6.

[0130] The second main actuator 804 includes an electric motor 806 with an output shaft 806A, a spline head 806B, a belt 807, and a pulley 808. The pulley, fixed to the second main nut 664, rotates and translates relative to the second longitudinal axis B654. Components 806, 806A, 806B, 807, and 808 are not specifically shown in the figures for the second main actuator 804. These components are identical to those with the same reference numerals in the first main actuator 802. Therefore, the second main actuator 804 is configured to rotate the second main nut 664 about the second longitudinal axis B654 relative to the second spindle 654.

[0131] A second master brake 904 is provided, which has the same structure as the first master brake 902.

[0132] The left end of the upper clamping rail 646 is provided with a screw 910, a position sensor 912 and a connector 914.

[0133] The right end of the upper clamping track 646 is mechanically connected via a cylindrical pin 688 to a second main support 674 near the right side or the second side post 644, specifically to the pivot 722 of the second main support 674. The cylindrical pin 688 is press-fitted into the second main support 674. The upper clamping track 646 has a hinge recess 698 at its right end. A688 represents the central axis of the cylindrical pin 688, which forms the hinge axis of the second main support 674 relative to the upper clamping track 646. The hinge axis A688 is parallel to the lateral axis C6. The hinge axis A688 is stationary relative to the upper clamping track 646.

[0134] The main drive unit 800 includes two main actuators 802 and 804, which are configured to, on the one hand, cause the main nuts 662 and 664 to rotate relative to each other about a first longitudinal axis B652 and a second longitudinal axis B654, and on the other hand, cause the first spindle 652 and the second spindle 654 to rotate relative to each other about the first longitudinal axis and the second longitudinal axis. The main drive unit 800 also includes two main brakes 902 and 904.

[0135] The upper clamping track 646 can be moved relative to the side posts 642, 644 along the transverse axis B6 by appropriately controlling the first main actuator 802 and the second main actuator 804 of the main drive unit 800 via the controller 66. The movement of each main nut 662, 664 relative to the corresponding spindle 652, 654 causes the upper clamping track 646 to move relative to the corresponding spindle 652, 654 along the corresponding longitudinal axis B652, B654. The movement of the upper clamping track 646 is independent of the possible movement of the lower clamping track 648 relative to the side posts 642, 644 along the transverse axis B6, and the lower clamping track 648 remains stationary or moves during the displacement of the upper clamping track.

[0136] Specifically, since the first spindle 652 and the second spindle 654 do not move relative to the lower clamping track 648 during this displacement process, the position of the lower clamping track 648 along the transverse axis B6 will not change due to the relative rotation between the first main nut 662 and the first spindle 652, nor due to the relative rotation between the second main nut 664 and the second spindle 654. In this document, and in the semantics of the present invention, the upper clamping track 646 is the first clamping track, and the lower clamping track 648 is the second clamping track.

[0137] Because the threaded outer surfaces S652 and S654 extend continuously from the level of the main nuts 662 and 664 to the level of the lower clamping rail 648, preferably extending over at least 90% of the length L6 of the spindles 652 and 654, the displacement range or extent of the upper clamping rail 646 along the transverse axis B6 can be relatively high. In particular, if necessary, the upper clamping rail 646 can be pulled closer to the vicinity of the upper crossbeam 626 or closer to the vicinity of the lower clamping rail 648.

[0138] In this regard, the upper crossbeam 626 is positioned above the upper clamping track 646 and the lower clamping track 648 relative to the vertical axis Z6 at all positions of these clamping tracks along the spindles 652 and 654.

[0139] Advantageously, the lower clamping track 648 moves along the transverse axis B6 via a drive mechanism of the same type.

[0140] The reference numerals for the components of the clamping frame 6 that interact with the lower clamping track 648 are increased by 1000 compared to the reference numerals for the components that interact with the upper clamping track, and these components are structurally or functionally similar to the components that interact with the upper clamping track 646.

[0141] Specifically, the primary nut 1662 and the secondary nut 1664 are respectively mounted around the spindles 652 and 654 and do not have the possibility of moving relative to the primary support 1672 and the secondary support 1674 in a direction parallel to the transverse axis B6, respectively. The structure and function of the primary support and the secondary support are similar to those of the primary support 672 and the secondary support 674.

[0142] Nuts 662, 664, 1662, and 1664 are preferably the same.

[0143] The first-stage support 1672 and the second-stage support 1674 are similar to the first main support 672 and the second main support 674, respectively. The lower clamping rail 648 does not have the possibility of translational movement relative to the secondary nuts 1662 and 1664 along an axis perpendicular to the main plane P6. All these supports include a pivot 722, a slide rail 724, a bracket 726, and a housing 728 similar to the pivot, slide rail, bracket, and housing of the first main support 672.

[0144] The secondary drive unit 1800 is formed by two secondary actuators 1802 and 1804, which are similar to the first main actuator 802 and the second main actuator 804, respectively.

[0145] Figure 4This is a cross-sectional view of actuator 1804, showing screws 1805 that secure the actuator to bracket 726 of secondary support 1674. Similar screws are used in other actuators 802, 804, and 1802.

[0146] Secondary brakes 1902 and 1904 are also connected to each secondary actuator 1802 or secondary actuator 1804. The primary brake 1902 and the secondary brake 1904 belong to the secondary drive unit 1800.

[0147] Each secondary actuator 1802, 1804 is configured to allow a secondary nut 1662 or 1664 to rotate relative to a spindle 652 or 654 about a first longitudinal axis B652 or a second longitudinal axis B654, wherein the outer surface of the spindle is threadedly engaged with the secondary nut.

[0148] In other words, the secondary drive unit 1800 allows the lower clamping rail 648 to move relative to the side posts 642, 644 in a direction parallel to the transverse axis B6 in essentially the same manner as the main drive unit 800 for the upper clamping rail 646. In other words, the movement of each secondary nut 1662, 1664 relative to the corresponding spindle 652, 654 causes the lower clamping rail 648 to move relative to the corresponding spindle 652, 654 along the corresponding longitudinal axis B652, B654. Specifically, since the secondary drive unit 1800 does not move the spindles 652, 654 relative to the main nuts 662, 664, the position of the upper clamping rail 646 is not changed by the relative rotation between the first primary nut 1662 and the first spindle 652 on the one hand, and the relative rotation between the second secondary nut 1664 and the second spindle 654 on the other hand.

[0149] The displacement of the upper clamping track 646 parallel to the transverse axis B6 is achieved via the main drive unit 800 and is independent of the displacement of the lower clamping track 648 parallel to the transverse axis B6, which is achieved via the secondary drive unit 1800. Specifically, this depends on whether only one or both of the drive units 800 and 1800 are powered.

[0150] - When only the main drive unit 800 is powered, the upper clamping rail 646 moves parallel to the transverse axis B6, while the lower clamping rail 648 remains stationary.

[0151] - When only the secondary drive unit 1800 is powered, the lower clamping track 648 moves parallel to the transverse axis B6, while the upper clamping track 646 remains stationary; and

[0152] When both drive units 800 and 1800 are powered, the two clamping rails 646 and 648 move parallel to the transverse axis B6, but may have different speeds and different ranges of motion.

[0153] For safety reasons, each brake 902, 904, 1902, or brake 1904 is adapted to stop the rotation of adjacent nuts 662, 664, 1662, or 1664 relative to their supports 672, 674, 1672, or 1674 in the event of a power outage. In practice, in the event of a power outage, the controller 66 does not supply energy to the coil, which causes the second jaw 908 of each brake to move away from the first jaw 907. In other words, all brakes 904, 1902, and 1904 operate in the same manner as brake 902. This means that when no power is supplied to the coil, such as in the event of a power failure or controller malfunction, any rotation of nuts 662, 664, 1662, or 1664 is prevented, which also means preventing any displacement of the upper clamping rail 646 and the lower clamping rail 648 along the transverse axis B6.

[0154] Advantageously, the diameter of the threaded outer surface S652 or the threaded outer surface S654 is approximately 25 mm, and the pitch of the external thread on this surface is approximately 5 mm. The lead screw angle (LSA) of this thread is defined as:

[0155] α = arctan(pitch / diameter × π) = arctan(5 / 25 × π) = 3.64° (Equation 1)

[0156] The lead helix angle α is small enough to ensure that the primary drive unit 800 and the secondary drive unit 1800 achieve self-locking operation due to the geometry and thread friction between the spindle and the nut. The lead helix angle α also reduces the torque applied by brakes 902, 904, 1902, or brake 1904, causing the nut to stop along the first or second axis. Given this configuration, brakes 902, 904, 1902, and 1904 are more compact than conventional brakes.

[0157] Each clamping rail 646 or clamping rail 648 is mounted on the main support 672 and the main support 674 or on the secondary support 1672 and the secondary support 1674 via cylindrical pins 686, 688, 1686 or cylindrical pin 1688, the cylindrical pins being partially accommodated in corresponding hinge recesses 696, 698, 1696 and hinge recess 1698.

[0158] The hinge recesses 696 and 1696 are cylindrical with a circular cross-section and are centered on hinge axes A686 and A1686, respectively, with A1686 being the central axis of the cylindrical pin 1686. These recesses are located in the upper clamping rail 646 and the lower clamping rail 648, respectively, near the left side post or the first side post 642. The cylindrical pins 686 and 1686 engage with the corresponding hinge recesses 696 and 1696 through a reduced radial clearance. Therefore, the hinge axes A686 and A1686 are fixed relative to the upper clamping rail 646 and the lower clamping rail 648, respectively.

[0159] Hinge recesses 698 and 1698 are located on the upper clamping track 646 and lower clamping track 648, respectively, near the right side post or the second side post 644. These hinge recesses 698 and 1698 are non-circular. Preferably, the hinge recesses 698 and 1698 are rectangular. The longitudinal dimension of this rectangle, parallel to the respective longitudinal axes A646 and A648, is greater than the width of the rectangle perpendicular to the respective longitudinal axes A646 and A648 and the lateral axis C6. Cylindrical pins 688 and 1688 engage with the respective hinge recesses 698 and 1698 in a direction parallel to the transverse axis B6 to reduce clearance. This allows the cylindrical pins 688 and 1688 located at the right ends of the clamping tracks 646 and 648 to move relative to these clamping tracks. Due to this feature of the clamping frame 6, the longitudinal axis A646 of the upper clamping track 646 can be tilted, particularly relative to the... Figure 11 The main longitudinal axis A6 represents the horizontal direction and is inclined relative to the transverse axis B6. Similarly, the longitudinal axis A648 of the lower clamping track 648 can be inclined, specifically inclined relative to the horizontal direction and relative to the transverse axis B6. In this case, axes A646 and A648 can be non-parallel to each other and non-parallel to the main longitudinal axis A6. This tilting movement occurs in the main plane P6. The side posts 642 and 644 and the clamping tracks 646 and 648 thus form a deformable quadrilateral.

[0160] This allows the upper clamping track 646 and the lower clamping track 648 to respectively... Figure 11 The configuration represented by the straight line in the middle is moved to the configuration represented by the axis trace. The upper clamping track 646 is in its two positions (e.g. Figure 11 The tilting motion between (as shown) is entirely achieved by the main drive unit 800, while the lower clamping rail 648 is in its two positions (as shown) Figure 11 The tilting motion between the lower clamping rails (as shown) is independent of the tilting motion between them; the tilting motion of the lower clamping rails is entirely achieved via the secondary drive device 1800. This tilting motion of one or both of the clamping rails 646 and 648 occurs on the main plane P6 and allows adjustment of the yarn tension of any yarn layer held by the clamping frame 6 by locally reducing or increasing the spacing d6 between the clamping rails 646 and 648 along the main longitudinal axis A6.

[0161] The memory 166 of the controller 66 is configured to remember several dedicated positions of nuts 662, 664, 1662, 1664, thereby remembering several dedicated positions of clamping tracks 646, 648 along spindle 652 or spindle 654. The dedicated positions can be as follows: Figures 1 to 3 and Figure 5 Each clamping track shown is used for the position of layer preparation, such as... Figure 10 and Figure 11 The position shown is where the yarn is threaded into the heddle frame 8, as indicated. Figure 12 The location shown at the start of the demolition process or as shown Figure 13 The location shown is at the end of the demolition process.

[0162] The removal step refers to moving the warp-threaded heald frame 8 from the front of the clamping frame 6 to the rear of the clamping frame 6, so as to bring the warp-threaded heald frame 8 closer to the warp beam B. In other words, during the removal step, the warp-threaded heald frame 8 moves towards the warp beam B along direction D12, which is perpendicular to axes A6 and Z6, so that the position of the warp-threaded heald frame 8 along direction D12 at the end of the removal step is closer to the warp beam B than during the warp insertion step. Specifically, direction D12 is parallel to... Figure 2 , Figure 10 , Figure 12 and Figure 13 The plane shown. Direction D12 is perpendicular to the outer frame 62. The position of the warp beam B in the warp-through chamber remains unchanged during the removal process.

[0163] Each dedicated position is defined by the position of the corresponding nut 662, 664 or nut 1662, 1664 relative to the corresponding spindle 652, 654 along the transverse axis B6. The controller 66 can determine the rotational movement of the nut 662, 664, 1662 or nut 1664 driven by the corresponding actuator 802, 804, 1802 or actuator 1804 about the first longitudinal axis B652 or the second longitudinal axis B654 based on the current position of the nut 662, 664, 1662 or nut 1664 as corresponding to one of the dedicated positions, so as to safely and quickly place the upper clamping rail 646 or the lower clamping rail 648 into the dedicated position.

[0164] The power supply and control of the electric motors 806 of the corresponding actuators 802, 804, 1802, and 1804 are all provided via cables. Some of these cables extend from the controller 66 to the bottom of the left column 642, and from there to each electric motor 806. Other cables extend from the controller 66 to the right side of the clamping frame 6 at the level of the crossbeam 626, and from there to the right column 644. Therefore, the warp threading of the warp yarn Y and the removal of the heald frame 8 are not affected by the cables. These cables are only used for... Figure 5 The dotted line 200 indicates this. To accommodate the movement of the upper clamping rail 646 and the lower clamping rail 648 parallel to the transverse axis B6, the cable 200 forms a deformable loop and extends partially into a deformable cable guide 202 (e.g., made of an articulated plastic component). Figure 5 As shown, the cable guide 202 and the cable 200 are located on the rear side of the subframe 64.

[0165] According to an advantageous aspect of the invention, the upper crossbeam 626 is also equipped with connecting devices for connecting the clamping frame 6 to the threading unit 4 for electrical and / or data transmission. These connecting devices are preferably carried by a cable chain 270, the length of which is equal to the entire displacement of the threading unit 4 relative to the clamping frame 6, to follow this displacement, and the cable chain is connected to the controller 66. These connecting devices are preferably releasable, allowing the connection between the clamping frame 6 and the threading unit 4 to be engaged or disengaged.

[0166] When the warp-threading unit 4 is used to thread and separate the warp yarn Y from the yarn layer L1 of the warp yarn stretched between the upper clamping track 646 and the lower clamping track 648, as... Figure 10 As shown, the controller 66 communicates bidirectionally with the unit, as indicated by the connecting line 206 in the figure. Preferably, the connecting line 206 is positioned at the level of the upper crossbeam 626 of the outer frame 62. Via this connecting line L206, the controller 66 is connected to the unit controller 42, the yarn separation device 44, and the yarn separation detection device 46. Specifically, the bidirectional signal S206 transmitted in the connecting line 206 may include a signal received from the yarn separation detection device 46, which the controller 66 considers to control at least one of the actuators 802, 804, 1802, and 1804 during warping. By considering the yarn separation efficiency evaluated by the yarn separation detection device 46 and modifying the tension within layer L1 during warping, yarn separation can be improved in real time.

[0167] Since the controller 66 can individually control each electric motor 806, and due to the possibilities of movement provided by the cylindrical pins 686, 688, 1686 and 1688, and the hinge recesses 696, 698, 1696 and 1698, the controller 66 can guide the main drive unit 800 and the secondary drive unit 1800 such that the upper clamping track 646 and the lower clamping track 648 are parallel or non-parallel to each other in the main plane P6.

[0168] When the two clamping tracks are not parallel, during the weaving process, the controller 66 can gradually change the tension of the warp yarn Y in the yarn layer L1 in an uneven manner. For example, the relative orientation of the upper and lower clamping tracks can be selected to increase the tension of the yarn near the yarn separating device 44, in order to facilitate yarn separation and improve the success rate of the operation of the yarn separating device 44.

[0169] On the other hand, the two clamping tracks 646 and 648 can also be arranged in a parallel configuration to uniformly increase the yarn layer tension throughout the entire yarn layer L1. Alternatively, the two clamping tracks can be arranged in a parallel configuration close together to reduce the yarn layer tension throughout the entire yarn layer L1.

[0170] According to an advantageous aspect of the invention, the sub-frame 64, and therefore the main plane P6, can be inclined relative to the outer frame 62 about a pivot axis A8, which is parallel to or entirely parallel to the main longitudinal axis A6. Specifically, this pivot axis is coplanar with the main plane P6. The pivot axis A8 is realized by pivot pins 208, which are fixed to the lower end of each side post 642 or 644 and rotatably mounted in a cylindrical recess of an adjacent vertical support 622 or 624 of the outer frame 62. The pivot axis A8 has a fixed position relative to the outer frame 62 and is located below the lowest position of the lower clamping track 648 relative to the spindles 652, 654. In other words, the pivot axis A8 is moved relative to the area of ​​the main plane P6 defined between the two clamping tracks 646, 648 to the ground G. In other words, the pivot axis A8 is located between the ground G and the lower clamping track 648.

[0171] Preferably, the pivot pin 208 is located at the level of the lower mounting base 656 of each side post 642 or side post 644.

[0172] The first side column 642 and the second side column 644 are fixed to the outer frame 62 along the main longitudinal axis A6. The first side column 642 and the second side column 644 do not have the possibility of relative movement along a direction parallel to the transverse axis B6.

[0173] Guide pins 210 are attached to the upper base 658 of each side post 642 or 644 and engage in curved slots 212 provided in the upper portion of the adjacent vertical brackets 622 or 624. Advantageously, each curved slot 212 has an arcuate shape centered on the pivot axis A8. This allows the guide subframe 64 to tilt about the pivot axis A8 relative to the outer frame 62.

[0174] This tilting motion of the subframe 64 causes corresponding tilting motions of the main plane P6, the transverse axis B6, the spindles 652 and 654, the side columns 642 and 644, the support members 672, 674, 1672 and 1674, as well as the upper clamping track 646 and the lower clamping track 648.

[0175] The operator can tilt the subframe 64 via a manual tilting actuator 240 (also called a tilting device), which includes a manual lever 242 connected to a sprocket 244 that engages with an elongated toothed hole 246 on a guide plate 248. The manual lever 242 rotates within the outer frame 62. This rotation of the manual lever 242, in turn, rotates the sprocket 244, allowing the guide plate 248 to move vertically relative to the outer frame 62. A cam groove 250 on the guide plate 248 actuates a tilting pin 252, which engages with either the left or right column 642 to control the position of that column about a pivot axis A8. In the illustrated example, the tilting pin 252 rests against the left column 642.

[0176] The synchronicity of the tilt of the left column 642 and the right column 644 about the pivot axis A8 is achieved by a cable traction device with a metal drive cable 402, which is fixed to two upper mounting bases 658 and guided by pulleys 404 on the left and right sides of the subframe 64.

[0177] During warp threading, as the warp yarn Y passes through elements 82, 84, and 86 of the heald frame 8, the tilting pin 252 is located in the recess 253 of the cam groove 250, thereby giving the tilting pin 252 a degree of freedom relative to the outer frame 62 and the vertical axis Z6 about the pivot axis A8, allowing the transverse axis B6 to tilt relative to the vertical axis Z6 by + / -3° through the rotation of the sub-frame 64 about the pivot axis A8. Figure 10 In the figure, reference numeral 252' indicates the position of the tilt pin when it is tilted 3° toward the rear. The subframe 64 contacts the threading unit in a direction parallel to the lateral axis C6, and can automatically adjust the tilt of the subframe relative to the vertical axis Z6 on the path of the threading unit 4 according to the position of the threading unit (especially when the ground G of the threading chamber is uneven).

[0178] In a preferred embodiment of the invention (not shown), a camera is mounted on the outer frame 62 and connected to the controller 66. The camera allows monitoring of the position of the sub-frame 64 relative to the outer frame 62, i.e., the tilt angle of the sub-frame 64 about the pivot axis A8. The camera also allows monitoring of whether the operator is within the internal volume defined by the outer frame 62, in order to prevent collisions between the movable clamping tracks 646, 648 and the operator when the primary and / or secondary actuators 802, 804, 1802, 1804 are actuated by the controller 66.

[0179] The threading method according to the invention can be implemented using the clamping frame 6 and the threading unit 4, and the threading method specifically includes the following steps:

[0180] a) Before the actual warp-threading step, the warp yarns of layer L1 are prepared from the weaving beam B by clamping the warp yarns of layer L1 on the upper clamping track 646 and the lower clamping track 648 of the clamping frame 6.

[0181] b) Pass the warp yarn Y from yarn layer L1 into heald frame 8; and

[0182] c) Remove the weaving heald frames with warp yarns 8.

[0183] Step c) requires that after the warp threading, the weaving heald frame 8 be moved from the front side of the main plane P6 to the back side of the main plane P6, that is, the warp beam B along one side of the lateral axis C6.

[0184] For any one of the above steps, or for each step, the controller 66 uses at least a dedicated location stored in the controller 66's memory 166 for the upper clamping rail 646 and the lower clamping rail 648. The dedicated location is the position reached by the given clamping rails at the beginning of the step, during the step, or at the end of the step.

[0185] for Figures 1 to 9 In step a) of the layer preparation shown, mandrels 652 and 654 and the main plane P6 are vertical, and controller 66 can actuate four actuators 802, 804, 1802, 1804 to reach designated positions on the upper clamping rail 646 and the lower clamping rail 648 for layer preparation. The two electric motors 806 of the two main actuators 802, 804 are actuated synchronously, and the two electric motors 806 of the two secondary actuators 1802, 1804 are also driven synchronously.

[0186] In the following text, height refers to the position of mandrels 652 and 654 along the transverse axis B6. The heights of the upper clamping rail 646 and the lower clamping rail 648 depend on the positions of the main nuts 662 and 664 and the secondary nuts 1662 and 1664 relative to mandrels 652 and 654 along the transverse axis B6, respectively. H6-1 represents the height of the upper clamping rail 646 in the prepared position of this layer. This height is measured between the central axis A686 and the pivot axis A8 of the cylindrical pin 686. H8-1 represents the height of the lower clamping rail 648 in the prepared position of this layer. This height is measured between the central axis A1686 and the pivot axis A8 of the cylindrical pin 1686. Heights H6-1 and H8-1 are measured parallel to the transverse axis B6.

[0187] ΔH68-1 represents the height difference between height H6-1 and height H8-1. It corresponds to the distance between the corresponding cylindrical pins 686 and 1686 that mate with the two clamping tracks 646 and 648, or the distance between the corresponding cylindrical pins 688 and 1688 that mate with the two clamping tracks 646 and 648, because these clamping tracks are horizontal. The height difference ΔH68-1 is equal to the interval distance d6 obtained at the longitudinal horizontal plane of axis A686 and axis A1686, plus the distance d646 between axis A686 and the lower edge of the upper clamping track 646, plus the distance d648 between axis A1686 and the upper edge of the lower clamping track 648, where distances d646 and d648 are obtained along the transverse axis B6.

[0188] More generally, the following relationship exists:

[0189] ΔH68=d6+d646+d648 (Equation 2)

[0190] ΔH68 and d6 are obtained at the same longitudinal horizontal position. For a given inclination of the upper clamping track 646 and the lower clamping track 648 relative to the horizontal direction, the distances d646 and d648 have constant values ​​because they are determined by the geometry of the upper clamping track 646 and the lower clamping track 648. The relationship in Equation 2 applies to all positions of the upper clamping track 646 and the lower clamping track 648.

[0191] In preparation step a), the operator pulls the yarn of layer L1 out of the warp beam B, from the rear side of the clamping frame 6 below the lower clamping track 648 to the front side of the clamping tracks 646, 648, to the front of the lower clamping profile 676, and then to the front of the upper clamping profile 676.

[0192] Then, the clamping rod 678 is inserted into the clamping contour 676 in the lower clamping track 648 and the upper clamping track 646 respectively, while the yarn Y is tensioned, which clamps the yarn Y of the yarn layer L1 in the clamping contour 676.

[0193] When yarn layer L1 is clamped by clamping tracks 646 and 648, the yarns extending inside yarn layer L1 are parallel to the transverse axis B6 and yarn layer L1 is parallel to the main plane P6.

[0194] To improve ergonomics, each operator can configure and store their own dedicated clamping track position according to their height, which corresponds to heights H6-1 and H8-1. Taller operators can set a higher height H6-1 than shorter operators.

[0195] During this operation, the operator can send instructions to the controller 66 via the display screen 68 to gradually adjust the height difference ΔH68-2 from the positions corresponding to heights H6-1 and H8-1, thereby adjusting the interval distance d6 between the two clamping rails 646 and 648 in order to obtain the correct tension in the yarn layer L1.

[0196] In preparation step a), the mandrels 652 and 654 extend vertically as a whole, and the upper clamping track 646 and the lower clamping track 648 extend parallel to each other and parallel to the main longitudinal axis A6. Therefore, the interval d6 taken at the longitudinal horizontal position of axes A686 and A1686 is equal to the interval d6 taken at the longitudinal horizontal position of axes A688 and A1688.

[0197] exist Figure 10 The second heights H6-2 and H8-2 are defined in the crossing positions shown in the figure. Figure 12 The diagram shows the third height H6-3 and H8-3 defined at the start of the demolition process. Figure 13 The diagram shows the fourth height H6-4 and H8-4 defined at the end of the demolition step.

[0198] Following layer preparation step a), for the threading step b), controller 66 can actuate four actuators 802, 804, 1802, and 1804 of subframe 64 to achieve the following: Figure 10 Heights H6-2 and H8-2 represent other dedicated positions. At the end of step a), the difference ΔH68-2 between these heights H6-2 and H8-2 is equal to the difference ΔH68-1 between the first heights H6-1 and H8-1. In other words, in Figure 2 The configuration shown and Figure 10 Between the configurations shown, the tension of the yarn layers remains constant. The following relationship exists:

[0199] ΔH68-2=ΔH68-1 (Equation 3)

[0200] The same applies to the interval distance d6, which maintains the same value across these dedicated locations.

[0201] exist Figure 10 In the warp-through configuration, during step b), the upper clamping track 646 is positioned relative to the pivot axis A8. Figure 2 The prepared configuration shown is higher. In other words, it has the following relationship:

[0202] H6-2>H6-1 (Relation 4)

[0203] Since the difference ΔH68-2 and the difference ΔH68-1 are equal, the following relationship also applies:

[0204] H8-2>H8-1 (Relation 5)

[0205] Lift the clamping tracks 646, 648 and the yarn layer L1 upwards so that the clamping frame 6 and the warp-threading unit 4 can be inserted together to the required height of the warp-threading unit 4.

[0206] Preferably, to protect yarn layer L1 from excessive tension in warp yarn Y, the upper clamping track 646 and the lower clamping track 648 move at the same speed from their first layer preparation positions at heights H6-1 and H8-1 along the transverse axis B6 to their second warp-threading positions at heights H6-2 and H8-2, respectively. This is achieved by simultaneously driving all nuts 662, 664, 1662, and 1664 at the same speed via the main drive device 800 and the secondary drive device 1800.

[0207] Step b) can be started, that is, the yarn Y of yarn layer L1 is threaded through the elements 82, 84, and 86 of the weaving heald frame.

[0208] Information about the type or size of the yarn Y separated from yarn layer L1 can be stored in memory 166 as part of the warp pattern. Alternatively, the type or size of the yarn Y to be separated can be identified by camera 46, which is part of the yarn separation detection device.

[0209] During the warping step b), for example, based on the yarn separation result evaluated by the yarn separation device 46 or depending on the type of yarn Y to be separated, the controller 66 can automatically adjust the height difference ΔH68-2, thereby adjusting the interval distance d6, or as... Figure 11 The inclination of the clamping tracks 646 and 648 relative to the main longitudinal axis A6, i.e., the variation of the interval distance d6 along the main longitudinal axis A6, allows adjustment of the tension of the entire yarn layer L1 along the length of the clamping frame 6 or adjustment of the tension of the warp yarn Y near the yarn separating device 44.

[0210] Alternatively, this adjustment of the height difference ΔH68-2 and the variation of the interval distance d6 along this main longitudinal axis A6 can be driven by the operator via the display screen 68 and the controller 66.

[0211] exist Figure 11 In the inclined configuration represented by the axis traces, the heights of the upper clamping track 646 and the lower clamping track 648 are different on the left and right sides of the clamping frame 6. The height H6-2L of the clamping track 646 near the left post 642 at the longitudinal horizontal level of the hinge axis A686 is higher than the height H6-2R of the same clamping track near the right post 644 at the longitudinal horizontal level of the hinge axis A688. On the other hand, the height H8-2R of the lower clamping track 648 near the right post 644 at the longitudinal horizontal level of the hinge axis A1688 is higher than the height H8-2L of the same clamping track near the left post 642 at the longitudinal horizontal level of the hinge axis A1686.

[0212] During the warping of yarn Y in yarn layer L1 through elements 82, 84, and 86 of the weaving heald frame, warping unit 4 moves relative to subframe 64 and outer frame 62 along the main longitudinal axis A6. Controller 66 can take into account the position of warping unit 4 along the main longitudinal axis A6 to automatically adjust the longitudinal horizontal spacing distance d6 of the foremost yarn Y in the yarn layer L1 to be separated.

[0213] During the warp-threading of yarn Y, subframe 64 can have along Figure 10 The direction of the rotating arrow R64 is the tilting movement about the pivot axis A8 towards the front of the clamping frame 6. The sub-frame 64 can also tilt in the opposite direction towards the rear of the clamping frame 6 at a position not shown. Figure 10 Between the positions shown, the amplitude of this tilting motion is + / -3°.

[0214] During the warping of yarn Y in yarn layer L1 through elements 82, 84, and 86 of heald frame 8, in cases of uneven ground G where warping unit 4 moves parallel to the main longitudinal axis A6, controller 66 can adjust the positions of upper clamping track 646 and lower clamping track 648, i.e., heights H6-2 and H8-2, according to the position of warping unit 4, and especially the position of yarn separating device 44 parallel to transverse axis B6. In this case, lower clamping track 648 and upper clamping track 646 preferably move synchronously in the same direction parallel to transverse axis B6. This is achieved by causing main nuts 662 and 664 and secondary nuts 1662 and 1664 to move synchronously at the same speed via main actuators 802 and 804 and secondary actuators 1802 and 1804.

[0215] When all the yarns Y in yarn layer L1 have been separated and threaded into the elements of the weaving heald frame 8, the threading step b) ends.

[0216] In dismantling step c), after all the warp yarns Y of yarn layer L1 have been warped through the elements 82, 84, and 86 of the heald frame, subframe 64 can have along... Figure 12 The direction of the rotating arrow R'64 is towards the rear side of the clamping frame 6, tilting about the pivot axis A8. This is achieved via the actuator 240 and, specifically, the cam groove 250, respectively... Figure 10 and Figure 12 This is achieved by moving the tilt pin 252 between the positions shown.

[0217] This tilting movement of the subframe 64 is guided by the displacement of the guide pin 210 within the arc-shaped slot 212.

[0218] β represents the tilt angle of the subframe 64 relative to the outer frame 62 towards the rear of the clamping frame. The maximum value of the tilt angle β is defined by the span of the arc-shaped slot 212.

[0219] This allows implementation Figure 12 The configuration in which the warp-through unit 4 has been removed from the clamping frame 6 and the angle between the transverse axis B6 and the vertical axis Z6 is equal to the maximum value of the tilt angle, which is approximately 8°.

[0220] At the start of dismantling step c), the upper and lower clamping rails are first adjusted to be horizontal and parallel to each other. In other words, if the heights were previously different, heights H6-2L and H6-2R are set to be equal, and heights H8-2L and H8-2R are also set to be equal. Therefore, along the main longitudinal axis A6, the height difference ΔH68-2L and height difference ΔH68-2R are also set to be equal. In other words, after the upper and lower clamping rails are adjusted to be horizontal, heights H6-2L and H6-2R are equal, and heights H8-2L and H8-2R are also equal.

[0221] Then, the lower clamping track 648 and the upper clamping track 646 move toward each other while remaining horizontal, in order to reach a position closer to each other. The configuration achieved at the end of this movement is as follows: Figure 12 As shown. The height difference ΔH68-3 in this configuration is much smaller than... Figure 2 The height difference ΔH68-1 in the configuration. The height difference ΔH68-3 and the spacing distance d6 in this configuration are the minimum possible height difference and distance between the lower clamping rail 648 and the upper clamping rail 646, because the main support abuts against the secondary support along the transverse axis B6.

[0222] Preferably, ΔH68-1 is at least 7 times larger than ΔH68-3. The following relationship applies.

[0223] ΔH68-1≥ΔH68-3×7 (Equation 6)

[0224] Heights H6-3 and H8-3 are low enough that the operator can advantageously mount the carriage 10 on at least one of the clamping rails, such as the lower clamping rail 648 as shown. Here, each operator can configure and store their own dedicated clamping rail positions corresponding to heights H6-3 and H8-3. The operator then guides the carriage 10 into the warp stop plate group 82 and the heald plate group 84 along a direction from the front to the rear of the clamping frame 6.

[0225] The arm 12 of the carriage 10 is telescopic and movable along direction D12.

[0226] Arm 12 in Figure 12 It is located below the lower clamping track 648 in the configuration.

[0227] At the end of dismantling step c), as Figure 13 As shown, the upper clamping track 646 and the lower clamping track 648 move upwards. In other words, at the start of dismantling step c), the upper and lower clamping tracks are brought to the fourth position, where their heights H6-4 and H8-4 are respectively greater than [missing information]. Figure 12 The corresponding heights H6-3 and H8-3 in the configuration have the following relationship:

[0228] H6-4>H6-3 (Relationship 7)

[0229] H8-4>H8-3 (Relation 8)

[0230] The distance ΔH68-4 between the two clamping tracks 646 and 648 is... Figure 12 The distance ΔH68-3 remains constant in the configuration. The following relationship exists:

[0231] ΔH68-4=ΔH68-3 (Equation 9)

[0232] exist Figure 12 configuration and Figure 13Between the configurations, the lower clamping track 648 and the upper clamping track 646 preferably move synchronously in the same direction parallel to the transverse axis B6. Therefore, the upward movement of the upper clamping track 646 and the lower clamping track 648 causes a similar upward movement of the elements 82, 84, 86 of the carriage 10 and the weaving heald frame, which brings the arm 12 above the warp beam B. This allows the carriage 10 to move along direction D12 between the left and right posts 642 and 644 through the free volume located between the left and right posts 642 and 644, where the upper and lower clamping tracks 646 and 648 no longer obstruct the free volume, and the free volume extends downward to the ground G. In other words, the weaving heald frame 8 supported by the carriage 10 can be lifted and transferred from the front to the rear of the clamping frame 6 without interacting with the outer frame 62 and the sub-frame 64. Figure 13 At the positions shown, the elements 82, 84, and 86 of the weaving heald frame can be transferred to a warp beam (not shown), which also supports the warp beam B located on the rear side of the clamping frame 6. The carriage 10 can then be disconnected from the corresponding clamping rail (e.g., the lower clamping rail 648).

[0233] Then, the warp beam carriage is used to transport the warp beam B and the warp weaving heald frame 8 to the loom (not shown in the figure).

[0234] As can be seen from the different configurations shown in the figure, for example, by comparing heights H6-4 and H6-3, and heights H8-1 and H8-4, a larger displacement range of the upper clamping track 646 and the lower clamping track 648 along the transverse axis B6 is advantageous. Specifically, when the main supports 672 and 674 abut against the upper mounting base 658, height H6-4 is the maximum height achievable by the upper clamping track 646 on the clamping frame 6. When the secondary supports 1672 and 1674 abut against the lower mounting base 656, height H8-1 is the minimum height achievable by the lower clamping track 648 on the clamping frame 6. Height H8-4 is the maximum height achievable by the lower clamping track 648 on the clamping frame 6.

[0235] Consider a configuration not shown, in which the upper clamping track 646 is located Figure 13 The horizontal position shown is at height H6-4, where the lower clamping track 648 is located. Figure 2 In the horizontal position shown, at height H8-1, the height difference and the spacing distance d6 have their maximum values, ΔH68 respectively. max and d6 max The relation applicable to relation 2.

[0236] Assume the upper clamping track 646 is held in position H6-4, while the lower clamping track 648 is... Figure 2 The first position shown (at height H8-1) was moved to... Figure 13The second position shown is at height H8-4. In other words, the lower clamping track 648 starts from the first position (at the first position, the distance between the lower clamping track and the upper clamping track 646 is the maximum value of the interval distance d6). max The lower clamping track 648 moves along the transverse axis B6 relative to each spindle 652, 654, with a range of movement equal to H8-4–H8-1, eventually reaching the second position H8-4. The range of motion of the lower clamping track 648 is strictly greater than the maximum value d6. max Half of it. For example, H8-4–H8-1 equals 1600mm, with a maximum value of d6. max It equals 1700mm. Preferably, the upper clamping track 646 and the lower clamping track 648 have the same maximum range of motion.

[0237] Advantageously, the maximum value of the interval distance d6 is d6. max The diameter is greater than 1000 mm, preferably greater than 1500 mm.

[0238] The large-range displacement of the upper clamping track 646 and the lower clamping track 648 is achieved through the main drive device 800 and the secondary drive device 1800. Specifically, when the lower clamping track 648 is at its minimum height H8-1, the range of movement of the upper clamping track 646 along the transverse axis B6 is strictly greater than the maximum value d6 of the interval distance d6 between the two clamping tracks 646 and 648. max Half of it. Furthermore, when the upper clamping track 646 is at its highest position H6-4, the range of movement of the lower clamping track 648 along the transverse axis B6 is strictly greater than the maximum value d6 of the interval distance between the two clamping tracks 646 and 648. max Half of it. In other words, the positions H6-4 and H8-1 of the upper clamping track 646 and the lower clamping track 648 relative to the first spindle 652 and the second spindle 654 along the transverse axis B6 define the maximum value of the interval distance d6. max In this configuration, the upper clamping track 646 can move relative to each spindle 652, 654 along the transverse axis B6 to reduce the spacing distance d6 to a value strictly smaller than the maximum value d6 of the spacing distance d6. max Furthermore, the positions H6-4 and H8-1 of the upper clamping track 646 and the lower clamping track 648 relative to the first spindle 652 and the second spindle 654 along the transverse axis B6 define the maximum value d6 of the spacing distance d6. max In this configuration, the lower clamping track 648 can move along the transverse axis B6 relative to each spindle 652, 654 to reduce the spacing distance d6 to a value strictly smaller than the maximum value d6 of the spacing distance d6. max Half the value.

[0239] exist Figures 14 to 16In the second and third embodiments shown, elements that are the same as or equivalent to those in the first embodiment have the same reference numerals. Hereinafter, if... Figures 14 to 16 If a reference numeral is not mentioned in the specification, or is mentioned in the specification but not shown in the drawings, then that reference numeral corresponds to an element or component having the same element in the first embodiment. The following mainly describes the differences between the second or third embodiment and the first embodiment.

[0240] In a configuration not shown, wherein the upper clamping track 646 is in Figure 13 In the horizontal position shown, at height H6-4, the maximum value of the interval distance d6 is d6. max The upper crossbeam 626 extends above the upper clamping track 646.

[0241] exist Figure 14 and Figure 15 In the second embodiment, the main drive unit 800 is located horizontally at the lower clamping rail 648 and includes a first main actuator 802 and a second main actuator 804, which operate in the same manner as the secondary actuators 1802 and 1804 in the first embodiment. The main drive unit 800 also includes a main brake (not shown), which is similar to the main brakes 902 and 904 in the first embodiment.

[0242] The secondary drive unit 1800 includes a single secondary actuator 1802.

[0243] Each actuator 802, 804, and 1802 is mounted on the first main support 672, the second main support 674, and the first primary support 1672, respectively.

[0244] like Figure 15 As shown, the output shaft 806A and head 806B of the electric motor 806 of the secondary actuator 1802 drive the first pulley 808 via the first belt 807.

[0245] The first pulley 808 is synchronized with the second pulley 809 via the motion conveyor belt 810. The second pulley 809 is supported by the secondary support member 1674. The first pulley 808 is fixed around and along the first longitudinal axis B652 by the secondary nut 1662, and the second pulley 809 is fixed around and along the second longitudinal axis B654 by the secondary nut 1664.

[0246] In this configuration, a single actuator 1802, and specifically a single motor 806 of the actuator 1802, drives two secondary nuts 1662, 1664 to rotate, the two secondary nuts being threadedly engaged with spindles 652, 654 of two side posts 642, 644 near the subframe 64, respectively.

[0247] In the second embodiment, the threaded outer surfaces S652, S654 of the mandrels 652, 654 extend at least between the main nuts 662, 664 and the upper clamping rail 646 at all positions of the clamping rails 646, 648, preferably extending over at least 90% of the length of the mandrels 652, 654, as defined in the first embodiment. Therefore, the range of motion or amplitude of the clamping rails 646, 648 is close to the total length of the mandrels.

[0248] In this second embodiment, on the one hand, the relative rotation between the first main nut 662 and the first spindle 652 does not change the position of the upper clamping track 646; on the other hand, the relative rotation between the second main nut 664 and the second spindle 654 also does not change the position of the upper clamping track, because this relative rotation occurs at the level of the lower clamping track 648. Here, in the semantics of the invention, the lower clamping track 648 is the first clamping track, and the upper clamping track 646 is the second clamping track. Advantageously, furthermore, on the one hand, the relative rotation between the first primary nut 662 and the first spindle 652 cannot change the position of the lower clamping track 648; on the other hand, the relative rotation between the second primary nut 664 and the second spindle 654 also cannot change the position of the lower clamping track.

[0249] In this second embodiment, the longitudinal axis A646 of the upper clamping track 646 is parallel to the main longitudinal axis A6, that is, parallel to the horizontal direction. The longitudinal axis A648 of the lower clamping track or the first clamping track 648 can be tilted in the main plane defined as the main plane P6 of the first embodiment, particularly tilted relative to the horizontal direction. The longitudinal axis A646 of the upper clamping track or the second clamping track 646 cannot be tilted in the main plane P6. In this case, preferably, the upper clamping track 646 generally remains parallel to the main longitudinal axis A6, because it is not possible to change the distance equivalent to distance H6-2L relative to the distance equivalent to distance H6-2R in the first embodiment, since the two secondary nuts 1662, 1664 are always driven synchronously together.

[0250] exist Figure 16 In the third embodiment, the main drive unit 800 is mounted horizontally on the upper clamping rail 646, as in the first embodiment, and the main drive unit includes two main actuators 802 or equivalents, each having an electric motor 806. The electric motor 806 of the first main actuator 802 is capable of driving the main nut 662 to rotate about a first longitudinal axis B652 of the spindle 652. The electric motor of the second main actuator (not shown) is capable of driving a second main nut (not shown) to rotate about a second longitudinal axis (not shown) of a second spindle.

[0251] No secondary drive unit is mounted on the lower clamping rail 648. Instead, the secondary drive unit 1800 is formed by two secondary actuators 1802 and equivalents, as well as associated secondary brakes (not shown). Each secondary actuator is mounted on the base 628 of the left or right vertical bracket 622, or on an equivalent of the outer frame 62 of the clamping frame 6 in the third embodiment. Figure 16 A primary actuator 1802 is shown, located next to the left vertical support 622. A second secondary actuator (not shown) is located next to the right vertical support.

[0252] The primary actuator 1802 includes an electric motor 806 having an output shaft 806A. The output shaft is fitted with a spline head 806B, which drives a pulley 807. The pulley 807 drives a wheel 1812, which is fixedly connected to a spindle 652, to rotate. The wheel 1812 drives the spindle 652 to rotate relative to the outer frame 62 about a first longitudinal axis B652 of the spindle.

[0253] During translation and rotation about the first longitudinal axis B652, the secondary nut 1662 is fixed to the secondary support 1672. The rotation of the spindle 652 about its own first longitudinal axis B652 drives the secondary nut 1662 and the support 1672, thereby lowering the clamping track 648 along the axis of the spindle.

[0254] Here, the first longitudinal axis B652 is the rotation axis of the first main nut 662 driven by the main actuator 802 and the rotation axis of the first spindle 652 driven by the secondary actuator 1802.

[0255] Near the right column, the second-stage actuator also adopts the same arrangement.

[0256] In this configuration, the longitudinal axis of the upper clamping track can be tilted within the principal plane (defined as principal plane P6 in the first embodiment), as explained in the first embodiment. The tilting of the longitudinal axis of the lower clamping track 648 relative to the principal longitudinal axis within principal plane P6 can be achieved by different manipulations of the two secondary actuators 1802 and their equivalents, such as... Figure 11 As shown in the first embodiment.

[0257] In this third embodiment, the threaded outer surface S652 of the mandrel 652 extends at least between the main nut 662 and the lower clamping rail 648 in all positions of the upper clamping rail 646 and the lower clamping rail 648, preferably extending over at least 90% of the length of the mandrel as defined in the first embodiment. This also applies to the threaded outer surface of the second mandrel (not shown). Therefore, the range or amplitude of movement of the upper clamping rail 646 and the lower clamping rail 648 is close to the total length of the mandrel.

[0258] In this third embodiment, on the one hand, the relative rotation between the first main nut 662 and the first spindle 652 does not change the position of the lower clamping track 648; on the other hand, the relative rotation between the second main nut and the second spindle does not change the position of the lower clamping track. Here, in the semantics of the present invention, the upper clamping track 646 is the first clamping track, and the lower clamping track 648 is the second clamping track. In this third embodiment, on the one hand, the relative rotation between the first primary nut 662 and the first spindle 652 does not change the position of the upper clamping track 646; on the other hand, the relative rotation between the second primary nut and the second spindle does not change the position of the upper clamping track, and should be compensated by the main drive device 800 to ensure that the upper clamping track 646 is in the correct position along the transverse axis B6.

[0259] In all embodiments, and at any position of the lower clamping rail 648 relative to the mandrels 652, 654, the volume below the lower clamping rail 648, defined by the two side posts 642, 644 and the lower clamping rail 648, is free of beams and cables. This facilitates operator movement, displacement of the warp-threading unit 4, and removal of the weaving heald frame 8.

[0260] The present invention is not limited to the embodiments shown in the accompanying drawings.

[0261] In a variant of the invention not shown, in accordance with the teachings of US2942324A, each clamping track 646, 648 is configured to clamp the yarn Y of the yarn layer L1 within the corresponding clamping profile 676 by means of a comb.

[0262] In another variation of the invention (not shown), a clamping track is fixedly mounted relative to the side posts 642, 644 of the subframe 64 and does not have the possibility of relative movement with respect to the spindles 652, 654 parallel to the transverse axis B6. In this case, the fixed clamping track is preferably the upper clamping track 646 of the subframe 64, while the first clamping track in the semantics of the invention is the lower clamping track 648. The main drive device can be the drive device 800, 1800 of the first embodiment, or the drive device 1800 of the third embodiment.

[0263] In another variation of the invention (not shown), if the longitudinal axis of the first clamping track cannot be tilted within the main plane P6, the two main supports may be integrally constructed and / or formed by the first clamping track itself.

[0264] According to another variation not shown, cylindrical pins 686, 688 are mounted and fixed to the clamping rail, and cylindrical hinge recesses 1686 or 1688 are provided on the main support 672.

[0265] In another variation of the invention (not shown), the secondary drive device comprises only one actuator that drives a single secondary nut to rotate relative to a corresponding mandrel in order to adjust the orientation of the longitudinal axis of the second clamping track relative to the main longitudinal axis A6. The height position of the second clamping track at the level of the other mandrel is not adjustable.

[0266] In another variation of the invention (not shown), the subframe 64 is arranged to clamp two yarn layers of warp yarn side-by-side with two clamping rails. Thus, each clamping rail is equipped with two clamping profiles, as disclosed in EP4033021A1. With respect to one of the two clamping rails, a first clamping profile is fixed to the clamping rail along a transverse axis, while a second clamping profile is also fixed to the same rail along a transverse axis or can be moved relative to the first clamping profile along a transverse axis by an additional layer tensioning device, which is manually actuated by the operator, preferably during layer preparation in step a), without changing the position of the clamping rail relative to the mandrel along the transverse axis. At least one of the clamping profiles can be moved relative to the clamping rail along a corresponding longitudinal axis of the clamping rail supporting the clamping profile. The position adjustment of the two yarn layers along the main longitudinal axis A6 can be performed by a motor fixed to the clamping rail and controlled by a controller 66. This allows adjustment of the offset between the two yarn layers, thereby allowing alternative separation of the yarn from the two yarn layers by a single yarn separation device 44. Each yarn layer can be stored in a dedicated location, and the clamping frame 6 can adjust the position of at least one of the clamping tracks each time a new yarn layer is selected for yarn separation during step b).

[0267] According to another variation (not shown), the outer frame 62 is equipped with wheels, and the clamping frame 6 can be moved to or away from the warp-threading position in step b). This allows for yarn layer preparation preferably in the first preparation chamber, followed by moving the clamping frame 6 to the second warp-threading chamber where the warp-threading unit 4 is stored. This allows the warp-threaded heald frame 8 to be moved toward the warp beam B along direction D12 during step c). In removal step c), the position of the warp beam B relative to the warp-threading chamber remains unchanged. Preferably, the carriage 10 supporting the warp-threaded heald frame 8 does not have an arm that moves toward the warp beam B along direction D12. During step c), the movement of the clamping frame 6 toward the warp beam B along direction D12 results in the warp-threaded heald frame 8 being positioned closer to the warp beam B along direction D12 than it was during step b). Before the clamping frame 6, equipped with the carriage 10, is moved toward the warp beam B along direction D12, the carriage 10 is already mounted on either the upper clamping rail 646 or the lower clamping rail 648, and at least the lower clamping rail 648 moves upward parallel to the transverse axis B6, causing the arm 12 to be higher than the warp beam B. Therefore, when the clamping frame 6 moves closer to the warp beam B along direction D12, no interference occurs between the arm 12 and the warp beam B. In this case, the wheels of the outer frame 62 are not braked during step c).

[0268] When the threading unit moves within the threading chamber and relative to the clamping frame 6 during step b), the wheels of the outer frame 62 are braked in the first chamber during the preparation step and in the second chamber during the threading step. When the threading unit is fixed in the threading chamber during step b), and the clamping frame 6 moves within the threading chamber and relative to the threading unit 4, the wheels of the outer frame 62 transport the clamping frame relative to the threading unit. A plug allows for removable connection of the clamping frame 6 in the preparation chamber and / or the threading chamber for power and control signals.

[0269] According to another variation (not shown), subframe 64 may include two pairs of upper clamping tracks and lower clamping tracks, i.e., two upper clamping tracks and two lower clamping tracks. Each pair of clamping tracks is configured to clamp one yarn layer. In this case, preferably, the first pair of clamping tracks is coupled to a first pair of first and second mandrels, while the second pair of clamping tracks is coupled to a second pair of first and second mandrels. Therefore, the spacing between the upper and lower clamping tracks of the same pair should be considered. Thus, clamping frame 6 has four parallel mandrels (corresponding to mandrels 652 and 654), two parallel main planes (corresponding to main plane P6), and five to eight motors (corresponding to motors 806) for moving the clamping tracks along the respective mandrels, all preferably controlled by controller 66.

[0270] According to another variation of the invention (not shown), the tilt of the sub-frame 64 relative to the outer frame 62 is electrically controlled. Preferably, the sensing device can detect the tilt angle of the main plane P6 relative to the vertical axis Z6 and provide corresponding information to the controller 66.

[0271] According to another variation (not shown), the position sensor 912 may use an optical sensor (e.g., a camera) instead of a rotary transformer to monitor the position of the nut or clamping rail relative to the mandrel parallel to the transverse axis B6. Alternatively, the sensor may also be an inductive sensor.

[0272] According to another variation (not shown), the subframe 64 or the warp-threading unit 4 is equipped with a sensor for detecting yarn tension in at least the yarn layer L1 near the yarn separating device 44. In this variation, brushless DC motors are used in the actuators 802, 804, 1802, 1804, and advantageously, the yarn tension is measured directly by the motor 806.

[0273] In another variation of the invention (not shown), the subframe 64 or the threading unit 4 is equipped with a sensor for detecting the relative position of the threading unit 4 and the outer frame 62 parallel to the transverse axis B6, so as to adjust the position of the clamping tracks 646, 648 parallel to the transverse axis B6 if necessary during relative movement of the threading unit 4 relative to the clamping frame 6 along the main longitudinal axis A6.

[0274] According to another variation of the invention (not shown), the warping machine 2 includes a movable warping unit 4 and two clamping frames 6 of the type described above, the two clamping frames being spaced apart from each other along a main longitudinal axis A6. The movable warping unit 4 interacts alternately with one clamping frame 6 or the other clamping frame. In this case, for safety reasons, the actuators of the two sub-frames 64 of the two clamping frames 6 are connected to the same controller 66. In this case, a power or data connection, particularly an emergency signal connection, is provided between the two clamping frames 6, advantageously located at the level of the upper crossbeam 626 of the respective outer frame 62 of the two clamping frames. In this case, a sensor is advantageously provided for detecting the longitudinal position of the warping unit 4 relative to each sub-frame 64 along the main longitudinal axis A6.

[0275] According to a variation of the invention (not shown), instead of a releasable device or some cables, the connection device for connecting the clamping frame to the threaded unit or another clamping frame for data connection is a wireless connection device.

[0276] According to another variation of the invention (not shown), instead of removable connectors for the clamping frame 6 in the preparation chamber and / or through-chamber, the clamping frame 6 is equipped with a battery for power supply, which powers the main actuators 802, 804, controller 66, and display screen 68 of the clamping frame 6, as well as preferably the secondary actuators 1802, 1804. Preferably, the battery is fixed to the outer frame 62 of the clamping frame 6. In the case of multiple clamping frames 6, each clamping frame 6 is preferably equipped with a battery.

[0277] The embodiments and variations of the invention mentioned above can be combined in any technically feasible manner to produce new embodiments of the invention within the framework of the appended claims.

Claims

1. A clamping frame (6) for clamping at least one warp yarn (Y) of a yarn layer (L1), the clamping frame comprising at least: - First side pillar (642) and second side pillar (644); - An upper clamping track (646) and a lower clamping track (648) configured to clamp the warp yarns of the at least one yarn layer (L1), a first side post and a second side post mechanically connecting the upper clamping track and the lower clamping track together, the upper clamping track and the lower clamping track extending between the first side post and the second side post and spaced apart along a transverse axis (B6). Its features are: - The first side post (642) includes a first mandrel (652) having a first threaded outer surface (S652) centered on a first longitudinal axis (B652); - The second side post (644) includes a second spindle (654) having a second threaded outer surface (S654) centered on a second longitudinal axis (B654); - The first longitudinal axis (B652) and the second longitudinal axis (B654) are parallel to the transverse axis (B6), have fixed positions relative to each other, and together define the principal plane (P6); - The clamping frame includes two main nuts (662, 664), each of which engages with one thread of the first threaded outer surface (S652) and the second threaded outer surface (S654); - At least one of the upper clamping rails and the lower clamping rails, namely the first clamping rail (646; 648; 646), is mechanically connected to the two main nuts (662, 664) such that movement of each main nut relative to its corresponding spindle in a direction parallel to the transverse axis (B6) causes the first clamping rail (646; 648; 646) to move relative to its corresponding spindle in a direction parallel to the transverse axis (B6), and the first clamping rail (646; 648; 646) has no possibility of translational movement relative to the main nuts (662, 664) along an axis perpendicular to the main plane (P6); - The clamping frame (6) includes a main drive unit (800) which includes two main actuators (802, 804), each of which is configured to cause a corresponding main nut (662, 664) and a corresponding spindle (652, 654) to rotate relative to each other about a corresponding first longitudinal axis (B652) or a second longitudinal axis (B654); - The relative rotation between each main nut (662, 664) and the corresponding spindle (652, 654) does not change the position of the second clamping rail (648; 646; 648) in the upper clamping rail and the lower clamping rail relative to the first spindle (652) and the second spindle (654) along the transverse axis (B6); -Starting from a configuration in which the positions (H6-4, H8-1) of the upper clamping track (646) and the lower clamping track (648) relative to the first spindle (652) and the second spindle (654) along the transverse axis (B6) define the maximum value of the spacing distance (d6) between the upper clamping track (646) and the lower clamping track (648) along the transverse axis (B6), the first clamping track (646, 648; 646) is movable relative to each spindle (652, 654) along the transverse axis (B6) to reduce the spacing distance (d6) to a value strictly less than half of the maximum value of the spacing distance (d6); - The clamping frame (6) includes a controller (66) for controlling the two main actuators (802, 804).

2. The clamping frame according to claim 1, characterized in that: - Each of the main nuts (662, 664) is mounted on the main support (672, 674), and there is no possibility of translational movement between the main nuts and the main support in any direction parallel to the transverse axis (B6) and in all directions perpendicular to the transverse axis (B6); - Each of the main support members (672, 674) cooperates with the guide member (666) of the adjacent side column (642, 644), the guide member (666) extending parallel to the transverse axis (B6) and preventing the main support member (672, 674) from rotating about the corresponding longitudinal axis (B652, B654); - Each longitudinal end of the first clamping track (646; 648; 646) is hinged to the main support (672, 674), such that the longitudinal axis (A646) of the first clamping track (646; 648; 646) has the possibility of tilting relative to the transverse axis (B6).

3. The clamping frame according to claim 2, characterized in that: - The hinge axis (A686) of one longitudinal end of the first clamping track (646; 648; 646) relative to the corresponding main support (672) is perpendicular to the main plane (P6) and stationary relative to the first clamping track (646; 648; 646) and the corresponding main support (672); - Another longitudinal end of the first clamping track (646; 648; 646) includes a hinge recess (698) that engages with a cylindrical pin (688) of a corresponding main support member (674) in a direction parallel to the transverse axis (B6). The cylindrical pin (688) is centered on a hinge axis (A688) perpendicular to the main plane (P6), and the hinge recess (698) has a rectangular shape with a large dimension in a direction parallel to the longitudinal axis (A646) of the first clamping track (646; 648; 646).

4. The clamping frame according to any one of the preceding claims, characterized in that, - Each of the main nuts (661, 662) is mechanically connected to the first clamping rail (646; 648; 646) and has the possibility of relative rotation about the corresponding first longitudinal axis (B652) or second longitudinal axis (B654); - Each of the main actuators (802, 804) is fixed to the corresponding main nut (661, 662) at least along the transverse axis (B6); and - Each of the main actuators (802, 804) is configured to rotate the corresponding main nut (662, 664) relative to the first clamping rail (646; 648; 646) and the corresponding spindle (652, 654) about the corresponding longitudinal axis (B652, B654).

5. The clamping frame according to any one of claims 1 to 3, characterized in that, The main drive unit (800) includes at least one brake (902, 904) configured to selectively prevent relative rotation between the main nut (662, 664) and the corresponding spindle (652, 654).

6. The clamping frame according to any one of claims 1 to 3, characterized in that, The first spindle (652) and the second spindle (654) are fixed together with the mounting base (656, 658) of the side post (642, 644) without the possibility of rotation about the corresponding first longitudinal axis (B652) or second longitudinal axis (B654).

7. The clamping frame according to any one of claims 1 to 3, characterized in that... - The second clamping rail (648; 646; 648) is mechanically connected to two secondary nuts (1662, 1664), each secondary nut engaging with one thread of the first threaded outer surface (S652) and the second threaded outer surface (S654); - The second clamping rail (648; 646; 648) is mechanically connected to the two secondary nuts (1662, 1664) such that movement of the secondary nuts relative to the corresponding spindle in a direction parallel to the transverse axis (B6) causes the second clamping rail (648; 646; 648) to move relative to the corresponding spindle in a direction parallel to the transverse axis (B6), and the second clamping rail (648; 646; 648) does not have the possibility of translational movement relative to the secondary nuts (1662, 1664) along an axis perpendicular to the main plane (P6); - The clamping frame includes a secondary drive device (1800) including at least one secondary actuator (1802) configured to at least cause a secondary nut (1662, 1664) and a corresponding spindle to rotate relative to each other about a corresponding first longitudinal axis (B652) or a second longitudinal axis (B654). - The first threaded outer surface (S652) and the second threaded outer surface (S654) extend continuously from the corresponding main nut (662; 664) to the corresponding secondary nut (1662; 1664); and - The controller (66) is configured to control the at least one secondary actuator (1802).

8. The clamping frame according to any one of claims 1 to 3, further comprising an outer frame (62) having two vertical supports (622, 624) configured to stand on the ground (G), characterized in that, The first side post (642) and the second side post (644) are mounted on the outer frame (62) and located between the two vertical supports, along with the upper clamping rail (646) and the lower clamping rail (648). The main plane (P6) has the possibility of tilting (R64, R'64) relative to the two vertical supports (622, 624) about the pivot axis (A8). The pivot axis (A8), which is perpendicular to the transverse axis (B6), is fixed in place relative to the outer frame (62) and is located between the ground (G) and the lower clamping rail (648) along the transverse axis (B6).

9. The clamping frame according to any one of claims 1 to 3, characterized in that... - The clamping frame (6) includes an upper crossbeam (626) that extends above the upper clamping track (646) when the upper clamping track (646) is located at a position (H6-4) relative to the first spindle (652) and the second spindle (654) along the transverse axis (B6) at the maximum value of the spacing distance (d6) defining the interval between the upper clamping track (646) and the lower clamping track (648); and - The upper crossbeam (626) is equipped with connecting devices for connecting to the threading unit (4) and / or another clamping frame (6).

10. The clamping frame according to any one of claims 1 to 3, characterized in that, The clamping frame includes at least one sensor (912) configured to detect the relative position between nuts (662, 664, 1662, 1664) and corresponding spindles (652, 654), and the sensor (912) is connected to the controller (66).

11. The clamping frame according to any one of claims 1 to 3, characterized in that, The clamping frame includes a carriage (10) which is removably mounted on the first clamping rails (646, 648) and configured to support a weaving heald frame (8) such that the weaving heald frame (8) moves along the transverse axis (B6) with the first clamping rails (646; 648; 646) relative to the first mandrel (652) and the second mandrel (654) via the main drive device (800).

12. A warping machine (2) for threading warp yarns (Y) from at least one yarn layer (L1) into a heald frame (8), characterized in that, The threading machine includes: - At least one clamping frame (6) according to any one of the preceding claims; -Threading unit (4), wherein the threading unit is equipped with at least: ○ Yarn separating device (44), the yarn separating device being configured to separate warp yarns from at least one yarn layer (L1) held in the clamping frame (6); ○ Threading device, which is configured to thread each separated warp yarn through the heald frame (8).

13. A warp-threading method for threading warp yarns (Y) from at least one yarn layer (L1) into a heald frame (8), the warp-threading method using: - The clamping frame (6) according to any one of claims 1 to 11; and -Threading unit (4), wherein the threading unit is equipped with at least: ○ Yarn separating device (44), the yarn separating device being configured to separate warp yarns from at least one yarn layer (L1) held in the clamping frame (6); and ○ Threading device, the threading device being configured to thread each separated warp yarn through the heald frame (8), Its features are, The threading method includes at least the following sequential steps, the steps including: a) The at least one yarn layer (L1) is prepared from the warp beam (B) by clamping the warp yarns on the upper clamping track (646) and the lower clamping track (648) of the clamping frame (6); b) Passing the warp yarns (Y) from the at least one yarn layer (L1) into the heald frame (8); and c) The warp-threaded heald frame (8) is removed by moving it toward the warp beam (B) along a direction (D12) perpendicular to the vertical axis (Z6) and the main horizontal longitudinal direction (A6) of the clamping frame (6). Furthermore, the controller (66) of the clamping frame (6) controls the at least two main actuators (802, 804) to place the first clamping rail (646; 648; 646) at a first position along the transverse axis (B6) during one of steps a), b), or c), and to place the first clamping rail at a second position along the transverse axis (B6) during another of steps a), b), or c), the first position and the second position being different positions and each defined according to the position of each main nut (662, 664) relative to the corresponding spindle (652, 654) along the transverse axis (B6).

14. The method according to claim 13, characterized in that... - The controller (66) of the clamping frame (6) includes a memory (166); - Several different dedicated positions of the first clamping rails (646; 648; 646) are stored in the memory of the controller, each of the dedicated positions being defined according to the position of each master nut relative to the corresponding spindle (652, 654) along the transverse axis (B6); The controller (66) controls the at least two master actuators (802, 804) to place the first clamping rails (646; 648; 646) in one of their designated positions.

15. The method according to claim 13, characterized in that, - The warp-threading unit (4) is equipped with a yarn separation detection device (46), which is connected to the controller (66) and configured to detect the result of yarn separation performed by the yarn separation device (44); and - During step b), the controller (66) controls at least one of the main actuators (802, 804) according to a signal (S206) received by the controller (66) from the yarn separation detection device (46) to adjust the position of the first clamping track (646; 648; 646) relative to the first mandrel (652) and the second mandrel (654) along the transverse axis (B6).

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