A harness frame for a loom and a loom comprising such a harness frame

Abstract

A traction mechanism for controlling the heald frames of a loom equipped with a shed machine, for each heald frame, said traction mechanism comprises a set of connecting rods and a swing lever (72) coupled to said set of connecting rods for reproducing the movement of said shed machine to said heald frame. Said traction mechanism comprises at least one measuring portion (72C) equipped with a target (100) configured to interact with a sensor (110). In order to more easily install and remove said target on said measuring portion, each measuring portion is provided on a peripheral wall of one of said swing levers (72) or on a peripheral wall of a stabilizer of said traction mechanism, said target being reversibly mounted on said measuring portion (72C).

Description

Technical Field

[0001] The present invention relates to a traction mechanism for controlling the heald frame of a loom equipped with a shed machine, and a loom equipped with a shed machine and including such a traction mechanism. Background Technology

[0002] In the field of looms, shed machines are known to be of the mechanical truncate, electronic truncate, or mechanical treadle type. Regardless of type, these shed machines include a drive system with output bars that drive multiple sets of rods and bars that form a frame traction mechanism in parallel. For mechanical truncate and mechanical treadle types, each output bar is hinged to an output arm. For electronic truncate types, each output bar is hinged to a crank connected to an independent electric actuator with oscillating rotational motion. In other words, and in a known manner, the crank is hinged between the electric actuator (e.g., a motor) and the output bar. Warp yarns pass through the frame (also called the heald frame) and the frame is driven by the shed machine in a weaving manner designed for the weaving cycle of the warp yarns and weft inserts.

[0003] Corresponding to the movement of each group of rods and bars relative to the adjacent group in the frame, these groups are typically referred to as "drafts," and the rods and bars constitute the drafting mechanism. Depending on the shed settings applied between the drafting mechanism and the shed machine, the vertical stroke of the heald frame can be varied according to the technician's expectations, such that the amplitude, velocity, acceleration, or position at the intersection can be varied proportionally and may be unknown. The final and precise kinematics of the frame are sought to achieve optimal conditions that ensure fabric quality and meet desired productivity.

[0004] Due to the parallel frame construction developed in a reduced space, the ability to accurately analyze the frame movement of the facility, typically at high speeds, is quickly limited by the design of the measurement environment, the measurement methods known elsewhere, and the availability of technicians, both in terms of assisting technicians with initial adjustments and monitoring the drive of the shed in the woven frame.

[0005] WO-2006005599-A2, for example, describes a heddle frame traction mechanism that includes measuring targets, but does not describe the structure of these targets in detail.

[0006] For example, FR-2977592-A1 describes a traction mechanism driven by a shed machine equipped with a rotating target. This device is relatively cumbersome and cannot be mounted on the components of the traction mechanism.

[0007] For example, EP-3 341 509-A1 describes a heddle frame traction mechanism with a sensing device comprising a target machined directly into the edge of a swing arm, such that the target is confined within the material and cross-section of the swing arm. Such a sensing device is expensive, inflexible, and restricts the arm construction in terms of shape, size, and manufacturing method.

[0008] The present invention aims to solve these problems in particular by proposing a traction mechanism that includes an improved detection device that is easy and inexpensive to install and use. Summary of the Invention

[0009] Therefore, the present invention relates to a traction mechanism for controlling the heald frames of a loom equipped with a shed, the traction mechanism comprising, for each heald frame:

[0010] -A set of connecting rods,

[0011] - A swing arm, connected to the bar assembly and configured to reproduce the motion of the shed machine's discharge arm or crank to the heald frame, thereby driving the heald frame in alternating motion along the frame axis between an upward and downward position.

[0012] The swing arm is associated with the heald frame and includes a first swing arm and a second swing arm, wherein:

[0013] - The first swing arm is pivotally mounted relative to the loom about a first pivot axis orthogonal to the frame plane.

[0014] - The second oscillating arm is mounted to pivot relative to the loom about a second pivot axis parallel to the first pivot axis.

[0015] The rod assembly includes:

[0016] - The main rod is configured to connect to the exhaust arm or crank around a first joint, the first joint constituting a pivotal connection about an axis of rotation parallel to the first pivot axis.

[0017] - A first actuating rod, configured to be connected to a first end of the heald frame and intended to drive the heald frame to move along the frame axis.

[0018] - A second actuating rod, configured to be connected to a second end of the heald frame and intended to drive the heald frame to move along the frame axis.

[0019] - At least one connecting rod, which connects the first swing arm to the second swing arm and is designed to drive the second swing arm.

[0020] Wherein, the first swing arm:

[0021] - The second connector connects to the main connecting rod, and the second connector constitutes a pivot connection about a rotation axis parallel to the first pivot axis.

[0022] - Designed to drive the first actuating rod via a third joint and the connecting rod via a fourth joint, the third joint and the fourth joint each constituting a pivotal connection about a corresponding axis of rotation parallel to the first pivot axis.

[0023] Wherein, the second swing arm:

[0024] - Hinged around the fifth joint to the connecting rod.

[0025] - Designed to drive the second actuator rod via a sixth connector, wherein the fifth and sixth connectors each constitute a pivotal connection about a corresponding axis of rotation parallel to the first pivot axis.

[0026] The traction mechanism includes at least one measuring portion equipped with a target configured to interact with a sensor.

[0027] According to the present invention, each measuring portion is disposed on the peripheral wall of a component selected from the following components:

[0028] -First swing arm,

[0029] -Second swing arm,

[0030] - A third swing arm or stabilizer of the traction mechanism, wherein each of the third swing arm or stabilizer is mounted to pivot relative to the loom about a third pivot axis parallel to the first pivot axis and hinged to the connecting bar.

[0031] The target is reversibly mounted on the measuring part.

[0032] Because of this invention, each measuring part of the traction mechanism can be equipped with measuring targets according to the user's needs. For example, additional targets can be installed during the setup of the loom to ensure that the traction mechanism is properly set. Therefore, during production, only some of the targets can remain in place to monitor the performance of the loom. The targets are assembled to the swing arm or stabilizer, which does not require precise machining and can be manufactured by conventional means such as cutting, which is economical.

[0033] According to an advantageous but non-mandatory aspect of the invention, such a traction mechanism may include one or more of the following features, either individually or in any technically operable combination:

[0034] -The measurement section includes:

[0035] O A first side and a second side opposite to the first side, the first side and the second side defining a mid-plane between them orthogonal to the first pivot axis.

[0036] An edge, wherein the edge connects the first side surface to the second side surface with a constant thickness.

[0037] Meanwhile, the edge defines a receiving area, which is configured to receive the target radially relative to the pivot axis of the corresponding element.

[0038] - The receiving area has a generally convex shape in the intermediate plane, and the measuring portion is configured as follows:

[0039] O At one end of the arm of the first swing rod, or the arm of the second swing rod, or the arm of the third swing rod,

[0040] O, or about the first pivot axis of the first swing arm, or the second pivot axis of the second swing arm, or the third pivot axis of the third swing arm.

[0041] O or even at one end of the stabilizer.

[0042] -The objectives include:

[0043] O target subject,

[0044] The target body extends between the first and second ends and between two parallel edges located on either side of the longitudinal plane, wherein the longitudinal plane coincides with the intermediate plane when the target is mounted on the measuring portion.

[0045] The target body includes an inner surface and an outer surface. The inner surface is configured to be mounted opposite to and interact with the receiving area. The outer surface is opposite to the inner surface and oriented toward the sensor. The outer surface is geometrically defined by a cylinder with a circular cross-section and centered on a target axis. The target axis coincides with one of a first, second, or third pivot axis corresponding to an element on which one of a first, second, third, or stabilizer element is mounted.

[0046] O Two lateral flanges,

[0047] ▪ The two lateral flanges each extend parallel to the longitudinal plane from the corresponding edge of the body, and

[0048] ▪ The two lateral flanges are configured to be supported on the first and second side surfaces.

[0049] Meanwhile, the main body and the lateral flange define the receiving volume of the receiving area, which is opened by an opening centered in the longitudinal plane and having a width orthogonal to the longitudinal plane and approximately equal to the thickness of the edge.

[0050] Furthermore, the target is equipped with a mechanical connection device:

[0051] The mechanical connection device interacts with the measuring part to position the target on the measuring part, and

[0052] The mechanical connection device is arranged at each first or second end of the body and / or in the extension of the lateral flange.

[0053] - The target body is made of a synthetic polymer material, and each of the side flanges includes:

[0054] O is a lateral surface extending parallel to the longitudinal plane, and

[0055] O is provided on the lateral surface up to the inner surface, the radial slots being arranged such that when the target is installed or removed from the measuring portion, the target body flexibly deforms in its longitudinal plane by tangential bending, so as to move the mechanical connecting devices away from or toward each other.

[0056] - The receiving area includes a complementary connecting device for connecting to the mechanical connecting device of the target, the complementary connecting device being configured to interact with the connecting device to secure the target to the measuring portion.

[0057] The target includes mechanical connecting devices arranged in the extensions of the two lateral flanges, the mechanical connecting devices being spaced apart by a distance less than the thickness of the edges, and the measuring portion includes the complementary connecting devices, the complementary connecting devices including grooves formed in the first and second sides of the measuring portion and configured to interact with the connecting devices in order to secure the target to the measuring portion.

[0058] - The inner surface of the target body has a shape complementary to the receiving area and forms an abutment device for the receiving wall.

[0059] -The mechanical connection device includes:

[0060] O Two partitions, each of which protrudes from a first end and a second end of the target body toward the opening, and

[0061] Two target recesses are provided, each adjacent to a partition on one side of the opening. Each partition includes an internal protrusion on the opening side, the internal protrusions extending toward each other and defining an opening between them in the longitudinal plane. The opening has a width measured parallel to the longitudinal plane, which is smaller than a receiving width measured between the two target recesses.

[0062] The complementary connection device includes:

[0063] O Two radially projecting protrusions, the two radially projecting protrusions being far apart from each other and defining an outer width greater than the width of the opening in the intermediate plane therebetween, and

[0064] O has two grooves formed in the edge, each groove adjacent to the protrusion and each forming a receiving groove for the protrusion of the corresponding partition.

[0065] The partition and the radially projecting protrusions are configured such that, in the assembly configuration of the target on the measuring portion, each of the protrusions is positioned in one of the receiving grooves, and each of the protrusions is positioned in one of the target grooves.

[0066] Furthermore, the target is configured to be removed from the measuring portion through reversible flexible deformation of the target body.

[0067] -The mechanical connection device includes:

[0068] O has two protruding partitions at each of the lower and upper ends of the target body, and

[0069] Two target recesses, each of which abuts a partition relative to the opening, each partition including an external protrusion at an end remote from the inner surface, the two external protrusions extending opposite to each other and defining a space between them in the longitudinal plane:

[0070] ▪ The maximum width measured parallel to the longitudinal plane, and

[0071] ▪ The receiving width measured between the two target grooves, wherein the receiving width is less than the maximum width.

[0072] The complementary connection device includes:

[0073] O Two radially protruding protrusions, the two radially protruding protrusions pointing towards each other and defining an outer width in the intermediate plane that is smaller than the maximum width of the target partition.

[0074] Two grooves are arranged in the edge, each groove adjacent to the protrusion and each forming a receiving groove.

[0075] The protruding partitions and the protrusions are configured such that, in the assembly configuration of the target on the measuring portion, each partition is positioned in one of the receiving grooves, while the protrusion is positioned in the target groove, and the target is configured to be removed from the measuring portion by reversible flexible deformation of the target body.

[0076] - The radially protruding protrusions and wall grooves each have a radius of curvature greater than 2 mm, preferably greater than 5 mm.

[0077] - The outer surface of each target includes at least one ferromagnetic portion and at least one non-magnetic portion, with each ferromagnetic portion adjacent to the non-magnetic portion of the target.

[0078] The target comprises two ferromagnetic portions of equal length, separated by a nonmagnetic portion.

[0079] The target comprises two ferromagnetic portions of different lengths, which are separated by a nonmagnetic portion.

[0080] -The complementary connection device between the target and the measuring part:

[0081] O is asymmetrical with respect to the lateral plane of the target, the lateral plane being radial to the target axis and defining an upper target portion and a lower target portion having similar volumes, and

[0082] O is configured to assemble the target onto the receiving wall of the measuring section in an oriented manner.

[0083] - The ferromagnetic portion of each target includes an insert made of a ferromagnetic material such as metal, while the target body is made of a non-magnetic material, and each insert includes an outer surface that is geometrically held by a cylinder that defines the outer surface of the target, and the measuring portion is contained within the cylinder that defines the outer surface of the target.

[0084] - The outer surface of at least one insert is defined in the longitudinal plane of the target between two sharp edges parallel to the target axis.

[0085] - Each sensor is fixedly mounted relative to the frame of the loom, facing the target on which the measuring section is equipped.

[0086] - One or more ferromagnetic portions and one or more non-magnetic portions of the same target together form a detection area that extends along a corner sector that is greater than the angular travel of the target when the measuring portion on which the target is mounted pivots between its high and low positions.

[0087] The present invention also relates to a loom equipped with a shed machine, the loom being equipped with the traction mechanism as described above. Attached Figure Description

[0088] The invention will be better understood from the following description of five embodiments of the traction mechanism and a loom based on the principle of the traction mechanism, and other advantages of the invention will become clearer. The description is given by way of example only and is made with reference to the accompanying drawings, wherein:

[0089] Figure 1 This is a schematic diagram of a loom, which includes a shed mechanism according to a first embodiment of the invention and includes a swing rod equipped with a measuring target, the loom being shown in a first configuration;

[0090] Figure 2 In order to be in Figure 1 A larger-scale view of the swing arm and sensor visible in box II;

[0091] Figure 3 for Figure 2 According to Figure 1 A partial perspective view of the swing arm and sensor, observed by arrow III and shown in the second configuration;

[0092] Figure 4 For the measurement target, according to Figure 3 A three-dimensional view of arrow IV in the diagram;

[0093] Figure 5 The swing arm and the measuring target are shown in the assembly structure, according to Figure 3 The cross-section of plane V in the middle;

[0094] Figure 6 For similar Figure 5 The cross-section of the swing arm and the measuring target is shown in the configuration during assembly, which is referred to as the "assembly configuration";

[0095] Figure 7 For similar Figure 4 A view showing the measurement target according to a second embodiment of the present invention;

[0096] Figure 8 For similar Figure 6 A view showing the oscillating arm and its assembly configuration. Figure 7 The measurement target;

[0097] Figure 9 For similar Figure 4 A view showing the measurement target according to a third embodiment of the invention;

[0098] Figure 10 For similar Figure 6 A view showing the oscillating arm and its assembly configuration. Figure 9 The measurement target;

[0099] Figure 11 A perspective view of the measurement target, shown separately, according to a fourth embodiment of the present invention; and

[0100] Figure 12 for Figure 1 A partial perspective view of a variant embodiment of a traction mechanism, the traction mechanism including a stabilizer equipped with a measurement target according to a fifth embodiment of the present invention. Detailed Implementation

[0101] Figure 1 Loom M is schematically shown. Loom M is equipped with a shed machine 2, which drives the heald frame 4 via a traction mechanism 6. The shed machine 2 is a treadle-type machine.

[0102] The heald frame 4 and the associated traction mechanism 6 form a unit. In practice, the loom M includes at least two components 8 that associate the two heald frames 4 and the traction mechanism 6 to unfold the warp sheets during weaving and allow the weft yarns to be inserted between the warp sheets. Figure 1 Only one component 8 is shown, and the description of the shown component 8 applies to the other components of the heddle frame 4 and the traction mechanism 6, which are not shown.

[0103] The heddle frame 4, shown in part here, has a generally rectangular shape extending in the frame plane P4. The frame plane P4 is vertical and corresponds here to... Figure 1 The plane in the middle.

[0104] The heddle frame 4 includes a first post 40 and a second post 41 arranged vertically, and two horizontal crossbars, only one of which, 42, is visible. The heddle frame 4 includes heddles 44, each heddle 44 containing eyelets 45 for receiving warp threads of the fabric being woven. Each heddle frame 4 is translatable along the vertical frame axis Z4.

[0105] The shed machine 2 includes a main frame 20 fixed relative to a frame B of the loom M, and discharge arms 22 pivotally mounted relative to the main frame 20 about an axis of rotation orthogonal to the frame plane P4. Frame B is schematically shown in the drawings. The axis of rotation of the discharge arms 22 is not shown. The discharge arms 22 perform alternating movements F22, indicated by double arrows. The shed machine 2 also includes clips 24 on each discharge arm 22, which allow connection to a traction mechanism 6, and the position of the clips 24 along the discharge arm 22 is adjustable. Once the position of the clips 24 is adjusted by the user, the clips 24 are fixed relative to the discharge arm 22.

[0106] For each heald frame 4, the traction mechanism 6 is thus configured to reproduce the alternating motion F22 of the discharge arm 22 to the corresponding heald frame 4, so as to drive the heald frame 4 with alternating motion F4 along the frame axis Z4 between high and low positions. Depending on the position of the clamp 24 along the discharge arm 22, the operator can adjust the degree of motion F4 of the heald frame 4, that is, adjust the distance between the high and low positions of the heald frame 4.

[0107] exist Figure 1 In this specification, the heel frame 4 is shown in a low position. The components of the traction mechanism 6 are considered non-deformable, and assembly gaps are considered negligible. By extension, when the heel frame 4 is in a corresponding lowered or raised position, all components of the traction mechanism 6 connected to it are also referred to as being in the corresponding "lowered position" or "raised position." When in an intermediate stroke position between the lowered and raised positions, the heel frame 4 is referred to as being "at the crossroads." Unless otherwise stated, in this specification, all translational movements of the various components of the traction mechanism 6 are parallel to the frame plane P4, and all rotational movements of the components of the traction mechanism 6 are about rotation axes orthogonal to the frame plane P4. In other words, all rotation axes are parallel to each other.

[0108] We will now describe the traction mechanism 6 in detail.

[0109] The traction mechanism 6 includes a bar assembly 60 consisting of a set of connecting bars and a set of swing rods 70, the set of swing rods 70 being connected to the set of connecting bars and configured to reproduce the alternating motion F22 of the discharge arm 22 to the heel frame 4 so as to give the heel frame 4 a linear alternating motion F4 along the frame axis Z4.

[0110] The swing arm 70 includes a first swing arm 71 and a second swing arm 72, which are associated with the heald frame 4 in pairs.

[0111] The rod assembly 60 includes: a main rod 61 that connects the discharge arm 22 to a first swing arm 71; a connecting rod 62 that connects to the first swing arm 71 and a second swing arm 72 and is intended to drive the second swing arm 72; a first actuating rod 64 that connects the first swing arm 71 to a frame 4; and a second actuating rod 65 that connects the second swing arm 72 to the frame 4.

[0112] The connecting rod 62 is made of two parts and includes a first connecting rod portion 63A hinged to the first swing rod 71 and a second connecting rod portion 63B hinged to the second swing rod 72, wherein the first connecting rod portion 63A and the second connecting rod portion 63B are hinged together.

[0113] The first swing arm 71 has a body 710 with a central portion in which a main hole 711 is formed, the main hole 711 being centered on a first pivot axis X1 orthogonal to the frame plane P4. Therefore, the first pivot axis X1 is also orthogonal to the frame axis Z4. The main hole 711 receives a bearing configured such that the first arm 71 is pivotally mounted relative to the loom M about the first pivot axis X1.

[0114] The first swing arm 71 includes a first arm 712 and a second arm 713, each of which extends radially to a first pivot axis X1 and forms a non-zero angle between them, which is substantially orthogonal herein. The first arm 712 includes a first hole 714 at an end remote from the main hole 711 and a second hole 715 adjacent to the first hole 714, each hole configured to receive a joint bearing defining a pivotal connection along an axis parallel to the first pivot axis X1. Figure 1 In the middle, the first hole 714 is located between the second hole 715 and the shed machine 2.

[0115] The second arm 713 includes a third hole 716 at an end away from the main hole 711, the third hole 716 being configured to receive a pivot bearing that defines a pivot connection along an axis parallel to the first pivot axis X1.

[0116] Still Figure 2 The second swing arm 72 shown has a body 720 with a central portion, in which a circular main hole 721 is formed, the circular main hole 721 being centered on a second pivot axis X2 parallel to the first pivot axis X1. The circular main hole 721 receives a bearing 721A, and the second swing arm 72 is pivotally mounted relative to the loom M about the second pivot axis X2.

[0117] The second oscillating lever 72 includes a first arm 722 and a second arm 723, which extend radially to a second pivot axis X2 and form a non-zero angle between them, which is substantially orthogonal herein. The first arm 722 of the second oscillating lever 72 includes a first hole 724 at an end remote from the center portion, the first hole 724 being configured to receive a pivot bearing 726 defining a pivot connection along an axis parallel to the second pivot axis X2.

[0118] The second arm 723 of the second swing lever 72 includes a second hole 727 at an end away from the center portion, the second hole 727 being configured to receive a second joint bearing 728, the second joint bearing 728 defining a pivot connection along an axis parallel to the second pivot axis X2.

[0119] The main rod 61 has an elongated shape with opposing first end 611 and second end 612. The first end 611 is mounted here by a U-shaped clamp to a bearing of the clamp 24 to form a first joint A1 between the main rod 61 and the clamp 24. The first joint A1 is a pivotal connection about a first axis of rotation XA1. In other words, the main rod 61 is configured to connect to the discharge arm 22 around the first joint A1. In use configuration, as... Figure 1 As shown, the first rotation axis XA1 is parallel to the first pivot axis X1.

[0120] The second end 612 of the main connecting rod 61 is mounted by a U-shaped clamp to a joint bearing received in the first hole 714 of the first swing rod 71 to form a second joint A2, which is a pivotal connection about a second axis of rotation XA2. In other words, the main connecting rod 61 is configured to connect to the first swing rod 71 about the second joint A2. In use, the second axis of rotation XA2 is parallel to the first pivot axis X1.

[0121] The first actuating rod 64 has an elongated shape, which has a first end 641 having a hook shape here and a second end 642 opposite to the first end 641.

[0122] The first end 641 is configured to connect to the heald frame 4 and is intended to drive the heald frame 4 along the frame axis Z4 with a motion F4. The first end 641 is here connected to the bottom portion of the first post 40 of the heald frame 4, which corresponds to the first end of the heald frame 4.

[0123] The second end 642 of the first actuating rod 64 is mounted by a U-shaped clamp to a hinge bearing received in the third hole 716 of the first swing rod 71, thereby forming a third hinge portion A3, which is a pivotal connection about a third rotation axis XA3. In use, the third rotation axis XA3 is parallel to the first pivot axis X1.

[0124] The first connecting rod portion 63A has an elongated shape with opposing first end 621 and second end 622. The first end 621 is here U-clamped onto a pivot bearing received in a second hole 715 of the first swing rod 71 to form a fourth joint A4 between the first connecting rod 63A and the first swing rod 71. The fourth joint A4 is a pivotal connection about a fourth axis of rotation XA4. In other words, the first connecting rod portion 63A is configured to connect to the first swing rod 71 around the fourth joint A4. In use configuration, as... Figure 1 As shown, the fourth rotation axis XA4 is parallel to the first pivot axis X1.

[0125] The second connecting rod portion 63B has an elongated shape, having a first end 631 and a second end 632 opposite to the first end 631. The first end 631 is connected to the second end 622 of the first connecting rod portion 63A. The second end 632 is here U-clamped onto a hinge bearing 726 received in a first hole 724 of the second swing rod 72, so as to form a fifth joint A5 between the second connecting rod portion 63B and the second swing rod 72. The fifth joint A5 is a pivotal connection about a fifth axis of rotation XA5. In other words, the second connecting rod portion 63B is configured to be pivotally connected to the second swing rod 72 about the fifth joint A5. In use, as... Figure 1 As shown, the fifth rotation axis XA5 is parallel to the first pivot axis X1.

[0126] The second actuating rod 65 is similar to, and preferably identical to, the first actuating rod 64, and operates in a similar manner. The second actuating rod 65 is configured to connect to the second end of the heald frame 4, here to the lower portion of the second post 41 of the heald frame 4. The second actuating rod 65 is intended to drive the heald frame 4 along the frame axis Z4 with a movement F4 together with the first actuating rod 64. Therefore, driving the heald frame 4 at both ends balances the driving force on the heald frame 4, making the vertical movement at each end of the frame similar.

[0127] The second actuating rod 65 includes a hook-shaped first end 651 connected to the heddle frame 4 and a second end 652 opposite to the first end 651. The second end 652 is U-shapedly clamped onto a second hinge bearing 728 received in a second hole 727 of the second swing rod 72 to form a sixth hinge portion A6, which is a pivoting connection about a sixth rotation axis XA6. In the usage configuration, as... Figure 1 As shown, the sixth rotation axis XA6 is parallel to the first pivot axis X1.

[0128] The second swing arm 72 is similar to or even identical to the first swing arm 71. In particular, and advantageously, the second swing arm 72 and the first swing arm 71 have the same joint geometry and the same height above the ground plane, so that the pivoting of the first swing arm 71 and the second swing arm 72 is similar, and the vertical movement of the actuators 64 and 65, respectively hinged to the first swing arm 71 and the second swing arm 72, is identical. Specifically, the corresponding fourth and fifth joints A4 and A5 are equidistant from the corresponding pivot axes X1 and X2. The third and sixth joints A3 and A6 are equidistant from the corresponding pivot axes X1 and X2.

[0129] In the illustrated example, the traction mechanism 6 also includes a third swing arm 73. The third swing arm 73, located between the first swing arm 71 and the second swing arm 72, particularly contributes to the good distribution of forces transmitted to the heel frame 4.

[0130] The third swing arm 73 is similar to, and preferably identical to, the second swing arm 72. The third swing arm 73 includes a body 730 having a central portion in which a hole is provided, the hole being centered on a third pivot axis X3 parallel to the first pivot axis X1. The third swing arm includes a first arm 731 and a second arm 732, which extend radially to the third pivot axis X3 and are substantially orthogonal to each other therein.

[0131] In the illustrated example, the second end 622 of the first connecting rod portion 63A includes an attachment portion 623, to which the first arm 731 of the third swing rod 73 is connected to the attachment portion 623 to form a seventh joint A7, which is a pivotal connection about a seventh rotation axis XA7. The seventh rotation axis XA7 is parallel to the first pivot axis X1.

[0132] The second arm 732 of the third swing rod 73 is connected to the heddle frame 4 via a third actuating rod 66. The third actuating rod 66 is similar to, and preferably identical to, the first and second actuating rods 64 and 65. The third actuating rod 66 is rotatably hinged relative to the third swing rod 73 about an eighth joint A8. The eighth joint A8 defines a pivotal connection about an eighth rotation axis XA8, which is parallel to the first pivot axis X1 in the configuration of the traction mechanism 6.

[0133] The first end 631 of the second connecting rod portion 63B is here mounted with a U-shaped clamp to a bearing disposed in the second end 622 of the first connecting rod portion 63A, so as to provide a ninth connector A9, which is a pivotal connection about a ninth rotation axis XA9. The ninth rotation axis XA9 is parallel to the first pivot axis X1. In other words, the first connecting rod portion 63A and the second connecting rod portion 63B are interconnected around the ninth connector A9, thereby forming a pivotal connection about a rotation axis XA9 parallel to the first pivot axis X1.

[0134] In summary, the three pivoting rods 71, 72, and 73 each pivot about their respective pivot axes X1, X2, and X3. The pivot axes X1 to X3 are parallel to each other and orthogonal to the frame plane P4. The rod assembly 60 and the lever assembly 70 define nine joints, labeled A1 to A9, each a pivotal connection about a corresponding axis of rotation. These axes of rotation, labeled XA1 to XA9, are parallel to each other and orthogonal to the frame plane P4.

[0135] As frame 4 alternates between high and low positions (F4), each of the elements constituting rod assembly 60 and bar assembly 70 also moves between its corresponding high and low positions. Specifically, swing rods 71, 72, and 73 swing about their respective pivot axes in frame plane P4, such that the angular position of one of these elements in frame plane P4 provides crucial data regarding the positioning of traction mechanism 6 and the position of heel frame 4. Therefore, the overall operation of traction mechanism 6 can be monitored by measuring the positions of one or more of the rods and connecting rods in bar assembly 70 and rod assembly 60.

[0136] The traction mechanism 6 is therefore equipped with measuring targets 100 and sensors 110. Each target 100 is associated with a corresponding sensor 110. Each target 100 is mounted on an element of the traction mechanism 6 and is therefore movable, while each sensor 110 is fixedly mounted relative to the frame B of the loom M, facing the associated target 100.

[0137] Depending on the position of the sensor 110 facing the corresponding target 100, when the element of the traction mechanism 6 on which the target 100 is mounted reaches one of a high, low, or intermediate position, the sensor 110 is able to interact with the target 100. In other words, the sensor interacts with the target 100 on the measuring portion 72C on which the target 100 is mounted in a known traction mechanism position. Specifically, the sensor 110 is able to notify the loom that the mechanism element has reached a known position corresponding to a predetermined heald frame 4 height. In other words, the sensor 110 is mounted on the loom M in a position selected from a high, low, or intermediate position of the measuring portion 72C, in at least one of these high, low, or intermediate positions, and in this position, the sensor is adapted to interact with the target 100.

[0138] Therefore, the sensor 110 connected to the loom transmits signals that the controller can interpret in order to determine the rotation direction, oscillation angle change, position, speed, or acceleration of the equipped traction element.

[0139] By understanding the geometry of the traction mechanism at the frame, the angles and lengths of its components, this set of measurements makes it possible to interpret the travel at the frame, the shed height, and its speed or acceleration during the weaving cycle.

[0140] Furthermore, recording the frame status is incorporated into understanding the machine, making predictions, and refining models to, for example, prevent mechanical accidents. Equipping the frame with several traction mechanism elements allows for the simultaneous control of several moving frames. Interpreting these signals can provide insight into the weaving pattern or even the fabric being woven.

[0141] In the following text, the positioning of target 100 on the elements of traction mechanism 6 is considered in particular, which means the presence of sensor 110 associated with target 100 when the user wishes to perform a measurement.

[0142] As in Figure 1 In or at a larger proportion Figure 2 As illustrated in the example, several targets 100 can be mounted on a single element of the traction mechanism 6. Targets 100 are preferably mounted on the first, second, or third swing arms 71, 72, or 73.

[0143] In the illustrated example, the first swing arm 71 is equipped with four targets, while the second swing arm 72 and the third swing arm 73 are each equipped with three targets 100, the number of which can be varied according to user needs. A portion of the element of the traction mechanism 6 on which the targets 100 are mounted is called a measuring portion. Therefore, when the targets 100 are mounted on the measuring portion of this element of the traction mechanism 6, the position of each element of the traction mechanism 6 is monitored. Advantageously, as explained below, the measuring portion is contained within and tangent to the continuous convex hull of the element of the traction mechanism 6 on which the measuring portion is disposed.

[0144] Each measuring part is disposed here on one of the first, second, and third swing rods 71 ​​to 73, more specifically on the peripheral wall of one of the first, second, and third swing rods 71 ​​to 73. In other words, each measuring part is disposed at a certain distance from the pivot axis X1, X2, or X3 corresponding to the first, second, or third swing rod 71, 72, or 73, and each measuring part has alternating rotational motion about the axis X1, X2, or X3 when the heddle frame 4 is in alternating motion F4.

[0145] Compared to Figure 2 The remainder of the description is given for the target 100 shown, which is mounted on the second swing arm 72. The description of one target 100 mounted on the second swing arm 72 can be applied to other targets 100 mounted on other elements of the traction mechanism 6, such as those mounted on one of the elements of the connecting rod assembly 60.

[0146] The second swing arm 72 includes: a first measuring portion 72A, which is closer to the main hole 721 than the first hole 724 and the second hole 727; a second measuring portion 72B, which is disposed on the first arm 722 at an end away from the main hole 721; and a third measuring portion 72C, which is disposed on the second arm 723 at an end away from the main hole 721.

[0147] As described below, each target 100 is reversibly mounted on a corresponding measuring section 72A to 72C. Therefore, the user can increase or decrease the number of targets 100 mounted on the traction mechanism 6 according to his or her needs and the accessibility of the measuring section. The user may consider equipping the measuring section temporarily or permanently, or because this new equipment can also increase the understanding of the loom during maintenance operations or finally before starting the loom for the weaving cycle.

[0148] Advantageously, the target 100 can be selected based on the application, the traction mechanism, or the inherent characteristics of the loom to which the target 100 is equipped. Furthermore, the components of the traction mechanism 6 and the measuring portions of the components to be equipped can be selected based on possible accessibility.

[0149] exist Figure 2 The image shows a single sensor 110 facing a target 100 mounted on a third measuring section 72C. The target 100 has a target body 124 with an outer surface 120 facing the sensor 110.

[0150] The outer surface 120 is geometrically defined by a cylinder P120 having a circular cross-section centered on the target axis A100. The outer surface 120 is held by the cylinder P120. In a variation, the outer surface 120 may be substantially offset from, or partially defined relative to, the cylinder P120, such that the entire outer surface 120 is not strictly held by the cylinder P120. Figure 5 In this configuration, target 100 is mounted on the second swing arm 72, and the target axis A100 coincides with the second pivot axis X2 corresponding to the second swing arm 72. For convenience, the longitudinal plane P100 of target 100 is defined as a plane orthogonal to the target axis A100, and the transverse plane P101 of target 100 is defined as a plane orthogonal to the longitudinal plane P100 and containing the target axis A100.

[0151] Therefore, as the swing arm 72 and thus the target 100 move between its high and low positions, the distance between the outer surface 120 and the opposing sensor 110 remains constant, which contributes to good measurement accuracy.

[0152] More generally, when the target 100 is mounted on the measuring portion of one of the first, second, or third swing rods 71, 72, or 73, the outer surface 120 of the target 100 is geometrically defined by a cylinder P120 having a circular cross-section and centered on one of the first, second, or third pivot axes X1, X2, or X3 corresponding to the element on which the target 100 is mounted.

[0153] Now for reference Figures 3 to 6 The structure and installation of the target 100 mounted on the measuring unit 72C are described in detail. The description can be applied to the target 100 mounted on other measuring units.

[0154] A stationary sensor 110 is configured to detect the angular position and / or motion of the facing outer surface 120 of the target 100. Several sensor technologies can be used, including optical sensors, ultrasonic sensors, and the like. Advantageously, the sensor 110 is a magnetic field sensor, such as an inductive sensor. Magnetic field sensors are particularly well-suited to the environment of the loom M because the magnetic field generated by the sensor 110 and / or the facing target 100 is not disturbed by dust that may reach between the sensor 110 and the facing target 100.

[0155] like Figure 3 As can be seen, the outer surface 120 includes an upper ferromagnetic portion 101A, a lower ferromagnetic portion 101B, and a non-magnetic portion 102. The upper ferromagnetic portion 101A and the lower ferromagnetic portion 101B, shown in shaded lines, have the same length measured parallel to the longitudinal plane P100 of the target 100 and are separated by the non-magnetic portion 102. The upper ferromagnetic portion 101A and the lower ferromagnetic portion 101B are generally referred to as "ferromagnetic portion 101".

[0156] Therefore, as the target 100 moves alternately between its upper and lower positions, the opposing sensor 110 detects the alternating passing of the ferromagnetic portion 101 and the non-magnetic portion 102 in front of it, making it possible to detect the movement of the swing arm 72. Advantageously, the ferromagnetic portion 101 extends more than 5 mm, for example, 15 mm, which allows the controller of the loom M to clearly capture the signal from the sensor 110 and distinguish the ferromagnetic portion 101 from the non-magnetic portion 102, so as to interpret the change in magnetic field as the angular motion of the measuring portion 72C.

[0157] The high, low, and middle positions of the measuring section 72C correspond to the corresponding high, low, or middle positions of the heddle frame 4.

[0158] exist Figure 2 and 3 In the illustrated position, sensor 110 is positioned relative to non-magnetic portion 102, meaning the second swing arm 72 is in an intermediate position between its high and low positions. When the second swing arm 72 is in its corresponding lower or upper position, the corresponding upper ferromagnetic portion 101A or lower ferromagnetic portion 101B is positioned relative to sensor 110.

[0159] More generally, a single ferromagnetic portion 101 adjacent to the non-magnetic portion 102 is sufficient for the sensor 110 to detect motion of the target 100 in front of it. Thus, the outer surface 120 facing the sensor 110 includes at least one ferromagnetic portion 101 and at least one non-magnetic portion 102, with each ferromagnetic portion 101 adjacent to the non-magnetic portion of the target 100.

[0160] Advantageously, each target 100 includes several ferromagnetic portions 101 separated by one or more non-magnetic portions 102, which makes it possible to know the position of the second swing arm 72 more accurately.

[0161] Regardless of their number, the ferromagnetic portions 101 (one or more) and non-magnetic portions 102 (one or more) of the same target 100 together form a detection area that advantageously extends along an angular sector larger than the angular travel of the target 100 as the measuring portion 72C travels from its high position to its low position. In other words, the detection area of ​​the target 100 is large enough that when the target 100 moves between its high and low positions, the sensor 110 facing the target always faces the detection area, regardless of whether the measuring portions 72A, 72B, or 72C of the target 100 are mounted thereon.

[0162] exist Figure 5 The upper ferromagnetic portion 101A and the lower ferromagnetic portion 101B are shown in cross-section. In a first embodiment of the invention, each of the upper ferromagnetic portion 101A and the lower ferromagnetic portion 101B is made of an insert 103. The two inserts 103 of the first embodiment of the invention are similar to each other, preferably identical. Each insert 103 here has a generally parallelepiped shape with a convex outer surface 104 and is received in a housing disposed in the target body 124 of the target 100. Each insert 103 is made of a ferromagnetic material, such as a metallic material, while the nonmagnetic portion 102 is part of the target body 124. The target body 124 here is made entirely of a nonmagnetic material.

[0163] The outer surface 104 of each insert 103 is configured to face the associated sensor 110. The outer surface 104 of the insert 103 is geometrically contained within a cylinder P120 associated with the outer surface 120 of the target body 124.

[0164] In the illustrated example, the outer surface 104 of the insert 103 is geometrically merged with the outer surface 120 of the target body 124. In other words, the outer surface 104 of each insert 103 is geometrically held by a cylinder P120 having a circular cross-section centered on a target axis A100, which here coincides with a second pivot axis X2.

[0165] In a variant not shown, the outer surface 104 of the insert 103 of the target 100 is tangent to the cylinder P120 and each has a radius smaller than that of the cylinder P120, such that the outer surface 104 does not strictly coincide with the cylinder P120, but remains contained within the cylinder P120.

[0166] Each insert 103 includes two facets 105 adjacent to the outer surface 104 and orthogonal to the longitudinal plane P100. On each insert 103, each facet 105 forms an edge 106 with the outer surface 104 of that insert 103. Each edge 106 is preferably orthogonal to the longitudinal plane P100, i.e., parallel to the target axis A100.

[0167] For each insert 103, each edge 106 adjacent to the non-magnetic portion 102 is advantageously a sharp edge. A “sharp” edge means that each edge 106 has a radius of curvature of less than 1 mm, preferably less than 0.5 mm, more preferably less than 0.1 mm, in order to improve the ability of the sensor 110 to distinguish the ferromagnetic portion 101 from the adjacent non-magnetic portion 102. In other words, the outer surface 104 of each insert 103 extends in the longitudinal plane P100 of the target 100, between two sharp edges 106 parallel to the target axis A100.

[0168] Advantageously, the measuring portion 72C is contained within a cylinder P120 that geometrically supports the outer surface 104 of each insert 103. In other words, when the target 100 is mounted on the measuring portion 72C, the measuring portion 72C is recessed from the cylinder P120 that geometrically supports the outer surface 104 of each insert 103 so as not to interfere with the opposing sensor 110 when the second swing arm 72 pivots between its upper and lower positions.

[0169] The insert 103 of each target 100 arranged on the measuring portion 72C of the peripheral wall of the elements of the traction mechanism 6 shows the configuration of the traction mechanism 6 associated with the opposing sensor 110 between its high and low positions.

[0170] Advantageously, the target 100 can be selected for a specific measurement need based on the number of inserts 103 or the nature of the inserts 103. Therefore, the shape, the properties of the material used for measurement, etc., can be selected independently of the characteristics of the edge of the swing rod whose motion will be analyzed.

[0171] exist Figures 2 to 6 In the example shown, the second swing arm 72, and therefore the additional measuring portion 72C, is formed of a metal plate, preferably of steel, which includes... Figure 3 The first side 80 and the second side 82 opposite to the first side 80 are visible in the middle. The first side 80 and the second side 82 define an intermediate plane P72 orthogonal to the second pivot axis X2 between them. When the target 100 is mounted on the measuring part 72C, the longitudinal plane P100 coincides with the intermediate plane P72 of the measuring part 72C.

[0172] The first side 80 and the second side 82 are connected by an edge 84 having a closed profile and a constant thickness E72. Therefore, the edge 84 forms the peripheral wall of the second swing arm 72. In other words, the measuring portion 72C has the thickness E72 of the swing arm (based on the thickness of the edge 84 of the swing arm).

[0173] Edge 84 includes Figure 5 and 6 The visible receiving area 86 is configured to receive the target 100 radially relative to the second pivot axis X2, either entirely or partially.

[0174] The receiving area 86 includes a complementary connection device 88 configured to interact with the connection device 122 of the target 100 to mechanically secure the target 100 to the measuring portion 72C. The connection device 122 is discussed in more detail below.

[0175] The complementary connecting device 88 here includes two protrusions 90 configured to project from the receiving region 86. The receiving region 86 has a generally convex shape in the intermediate plane P72 such that the edge 84 defines a uniform material thickness around the connector A6 configured to receive the target 100. The two protrusions 90 extend radially relative to the second pivot axis X2 and are directed away from each other, defining an outer width L90 between them in the intermediate plane P72. Each protrusion 90 abuts a groove disposed in the edge 84, the groove forming a receiving groove 92 configured to interact with the connecting device 122. In a first embodiment of the invention, the two protrusions 90 are located between two receiving grooves 92, the two receiving grooves 92 being oriented relative to each other. The distance D92 between the bottoms of the two receiving grooves 92, measured in the intermediate plane P72 parallel to the width L90, is strictly less than the outer width L90 of the two protrusions 90.

[0176] Target 100 has a roughly symmetrical shape with respect to the longitudinal plane P100 and with respect to the transverse plane P101.

[0177] The target body 124 of target 100 is typically shaped as a slightly dome-shaped, flat parallelepiped, wherein the outer surface 120 of target 100 corresponds to the convex surface of the parallelepiped. Target body 124 also includes an inner surface 126 opposite to the outer surface 120. The inner surface 126 is configured to face and interact with the receiving region 86.

[0178] The target body 124 extends along a angular sector centered on the target axis A100 between the upper end 128A and the lower end 128B. The upper end 128A and the lower end 128B are located on opposite sides of the transverse plane P101.

[0179] The target body 124 also includes two edges 130A and 130B on either side of the longitudinal plane P100, each edge 130A and 130B being geometrically held by a plane parallel to the longitudinal plane P100. The target body 124 also includes two lateral flanges 132 and 134, each lateral flange 132 and 134 extending parallel to the longitudinal plane P100 from the corresponding edge 130A or 130B of the body 124 on one side of the inner surface 126. The two lateral flanges 132 and 134 are configured to be supported on corresponding first side surface 80 and second side surface 82.

[0180] The target body 124 and the lateral flanges 132 and 134 together define a volume V100 for receiving the receiving region 86. The receiving volume V100 includes a bottom 127, which contains an inner surface 126 of the target body 124. The inner surface 126 has a shape complementary to the shape of the receiving region 86. When the target 100 is mounted on the measuring portion 72C, the bottom 127 forms a means for abutting against the receiving region 86.

[0181] The receiving volume V100 is open through an opening 135 opposite to the bottom 127, centered on the longitudinal plane P100 and having a width L100 that is orthogonal to the longitudinal plane P100 and approximately equal to the thickness E72 of the edge 84.

[0182] Lateral flanges 132 and 134 each include a radial slot 136, which is radially disposed relative to the target axis A100 and extends to the junction between the corresponding lateral flange 132 or 134 and the target body 124. In other words, the radial slot 136 extends into the inner surface 126 of the lateral flanges 132 and 134. Here, the radial slot 136 is configured to span the transverse plane P101.

[0183] Target 100 includes two partitions 138A and 138B, each extending from a corresponding upper end 128A and lower end 128B of target body 124. Both partitions 138A and 138B extend on the same side as the receiving volume V100 and are adjacent to the bottom 127. Each of partitions 138A or 138B connects side flanges 132 and 134 together.

[0184] Each partition 138A or 138B includes an inner protrusion 140 at an end remote from the bottom 127, the inner protrusion 140 extending into the receiving volume V100. The inner protrusions 140 extend toward each other and define an opening 142 between them, narrowing relative to the opening 135, in the longitudinal plane P100. The distance between the two inner protrusions 140, measured parallel to the longitudinal plane P100, defines the opening width L142 of the target 100.

[0185] Each of the internal protrusions 140 is adjacent to a target groove 143, which is disposed on a corresponding partition 138A or 138B between the internal protrusion 140 and the bottom 127 on the receiving volume V100 side. Two target grooves 143 are separated by a receiving width L143 measured parallel to the longitudinal plane P100 and the opening width L142. The receiving width L143 is strictly greater than the opening width L142.

[0186] In practice, the receiving width L143 is between 20 mm and 80 mm, preferably between 40 mm and 50 mm, more preferably about 48 mm, while the opening width L142 is between 20 mm and 80 mm, preferably between 40 mm and 50 mm, more preferably about 44 mm.

[0187] The receiving width L143 with the assembly gap is equal to the outer width L90 of the measuring portion 72C, while the distance D92 between the bottoms of the two receiving grooves 92 with the assembly gap is equal to the aperture width L142. In other words, the aperture width L142 is smaller than the receiving width L143 and the outer width L90 of the receiving volume V100.

[0188] exist Figure 5 In the image, target 100 is shown in an assembly configuration on measuring portion 72C. On one hand, partitions 138A and 138B and on the other hand, radially protruding protrusions 90 are configured such that an inner protrusion 140 is positioned in a space defined by a receiving groove 92, while a receiving area 86 receiving in receiving volume V100 abuts against bottom 127.

[0189] In other words, in the first embodiment of the invention, the complementary connecting device 88 includes a protrusion 90 and a receiving groove 92, while the connecting device 122 of the target 100 includes partitions 138A and 138B on which internal protrusions 140 are provided.

[0190] The radially protruding protrusion 90 and the receiving groove 92 each have a radius of curvature greater than 2 mm, preferably greater than 5 mm. Therefore, the measuring portion 72C is easy to manufacture (particularly by cutting) and does not require additional precision machining methods for mounting the target 100.

[0191] The sequence for mounting the target 100 onto the measuring section 72C is now described.

[0192] Advantageously, the target 100 is mounted on the second arm 723 of the second swing arm 72 arranged in the upward position, while the adjacent swing arm is in the downward position or in the cross position.

[0193] First, the operator approaches the target 100 of the measuring portion 72C, wherein the longitudinal plane P100 is aligned with the intermediate plane P72 and the opening 135 of the receiving volume V100 is oriented toward the measuring portion 72C. The operator introduces one of the protrusions 90 into the receiving volume V100 such that one of the internal protrusions 140 is received in the receiving groove 92 adjacent to the protrusion 90.

[0194] Then, target 100 and measuring part 72C are in Figure 6 In the assembly structure, target 100 is being mounted on measuring part 72C.

[0195] As the operator applies force to the target 100 approximately orthogonally to the outer surface 120, the target body 124 flexibly deforms to accommodate the passage of the receiving area 86. During this movement, the partitions 138A and 138B move away from each other by a width greater than the outer width L90.

[0196] As the movement continues, the receiving area 86 abuts against the bottom 127, and the protrusions 140 are each received in their respective receiving grooves 92. Then, the target 100 is in... Figure 5 In the assembly structure shown.

[0197] To facilitate the flexible deformation of the target body 124, radial slots 136 are arranged so that when the target is installed or unloaded on the corresponding measuring portion 72C, the target body 124 flexibly deforms in its longitudinal plane P100 by tangential bending, so that the mechanical connecting device 122 moves away from each other. The separators 138A and 138B move apart by the flexible deformation of the target body 124 to pass over the protrusion 90 of the measuring portion 72C. For this purpose, the target body 124 is made of a material capable of flexible deformation, preferably a synthetic polymer material, such as polyethylene, polypropylene, silicone, or an elastomer. For example, the target body 124 is manufactured by plastic injection molding in a mold of complementary shapes. Therefore, the target 100 is assembled onto the measuring portion 72C by hand without the use of tools.

[0198] In the assembly configuration, the target 100 is held on the measuring portion 72C by the flexibility of the target body 124. In other words, the target 100 is held or clamped to the measuring portion 72C so that the target 100 is held in the assembly configuration during the operation of the loom M, especially when the measuring portion 72C performs a oscillating motion about the second pivot axis X2 and the target 100 is subjected to centrifugal force.

[0199] Dismantling is performed using a reverse motion. The operator applies a force to the target 100 that tends to move the target away from the measuring portion 72C. Through the flexible deformation of the target body 124, the partitions 138A and 138B move apart to accommodate the passage of the receiving area 86 and the protrusion 90. Dismantling is also performed by hand without the use of tools. The target 100 can be reversibly assembled and disassembled as needed for setup within a limited time and is not limited to repetition because the target 100 is configured to be dismantled from the measuring portion 72C through the reversible flexible deformation of the target body 124.

[0200] exist Figures 7 to 12 In the second to fifth embodiments of the invention illustrated in the examples, elements similar to those in the first embodiment have the same reference numerals and operate in the same manner. Hereinafter, the differences between each embodiment and the foregoing embodiments (one or more) will be primarily described.

[0201] exist Figure 7 and 8 The image shows target 200 according to a second embodiment of the invention. Although in the first embodiment of the invention, the complementary connecting means 88 of the measuring portion 72C includes receiving grooves 92 disposed opposite to each other and target grooves 143 oriented toward each other, the complementary connecting means of target 200 includes wall grooves oriented toward each other, and the wall grooves of the measuring portion are oriented opposite to each other.

[0202] The target 200 is configured to be reversibly mounted to the measuring part 272C. Here, the measuring part 272C is disposed on the peripheral wall of the swing rod 272, which is pivotally mounted relative to the loom M about a pivot axis orthogonal to the frame plane P4 and not shown.

[0203] Target 200 includes a mechanical connection device 222, while measuring portion 272C includes a complementary device 88 configured to interact with the mechanical connection device 222 to secure target 200 to measuring portion 272C. Figure 8 The assembly structure shows target 200 and measuring part 272C.

[0204] Target 200 includes a flat, elongated, dome-shaped parallelepiped body 224, the body 224 having a convex outer surface 220 configured to face an associated sensor, an inner surface 226 opposite to the outer surface 220, and a top end portion 228A and a bottom end portion 228B opposite to the top end portion 228A. The sensor, not shown, is similar to, and preferably identical to, the sensor 110 of the first embodiment.

[0205] The outer surface 220 is geometrically defined by a cylinder with a circular cross-section centered on a target axis orthogonal to the longitudinal plane P200 of the target 200. The target axis is not shown. When the target 200 is mounted on the measuring portion 272C of the swing arm 272, the target axis coincides with the pivot axis of the swing arm 272.

[0206] The inner surface 226 has a shape complementary to the receiving area (receiving wall) 286 of the measuring portion 272C, and is configured to form an abutment at the receiving area 286 in the connection structure of the target 200 on the measuring portion 272C.

[0207] The target 200 also includes two side flanges 232 and 234, each side flange 232 and 234 extending from a corresponding edge of the body 224 parallel to the longitudinal plane P200 of the target 200, and the two side flanges 232 and 234 are configured to abut against the side of the measuring portion 272C. The body 224 and the side flanges 232 and 234 define a receiving volume V200 of the receiving region 286, which is open through an opening 235.

[0208] Side flanges 232 and 234 each include a radial slot 236, which is radially disposed relative to the target axis and tangential to the target body 224. In other words, the radial slot 236 extends into the inner surface 226 of the side flanges 232 and 234. Here, the radial slot 236 is arranged to span the transverse plane P201 of the target 200. The radial slot 236 is arranged such that when the target is mounted or removed from the corresponding measuring portion 272C, the target body 224 flexibly deforms in its longitudinal plane P200 by tangential bending.

[0209] Target 200 includes two partitions 238A and 238B, each of which is configured to protrude from the upper end 228A and lower end 228B of target body 224, respectively. Each of partitions 238A or 238B includes an external protrusion 240 at its end remote from the inner surface 226. The two external protrusions 240 extend away from each other and define a maximum width L240 between them, measured parallel to the longitudinal plane P200.

[0210] Each protrusion 240 is adjacent to a target groove 242, which is disposed on a corresponding partition 238A or 238B on the opposite side of the opening 235. Two target grooves 242 are spaced apart by a receiving width L242 measured between the two target grooves parallel to the longitudinal plane P200. The receiving width L242 is smaller than the maximum width L240.

[0211] The measuring portion 272C includes two protrusions 290 extending outward from either side of the receiving region 286 and pointing towards each other. Each protrusion 290 abuts a groove in the edge 84, the groove being located between the protrusion 290 and the receiving region 286 and forming a receiving groove 292 of the protrusion 240. The two protrusions 290 define an internal width L290, measured in the intermediate plane P72, between them. The internal width L290 is less than the maximum width L240 of the protrusion 240 of the target 200.

[0212] The partitions 238A and 238B and the protrusion 290 are configured such that, in the connection position of the target 200 on the measuring portion 272C, the partitions 238A and 238B of the target 200 are positioned in the receiving groove 292, while the protrusion 290 is positioned in the target groove 242.

[0213] In the second embodiment, the mechanical connection device 222 of the target 200 includes a protrusion 240 and a target groove 242 formed on each of the partitions 238A and 238B, while the complementary device 88 includes a protrusion 290 formed on either side of the receiving region 286, which leaves out the receiving groove 292.

[0214] During assembly, the operator inserts one of the protrusions 240 of the two partitions 238A or 238B, i.e., one of the two protrusions 240, into the receiving groove 292 of the measuring portion 272C and applies pressure to the other partition 238B or 238A, i.e., to the opposing partition, so as to bend the target body 224 and bring the protrusions 240 closer together, so as to insert the uninserted protrusions 240 into the corresponding receiving grooves 292 and position the target body 224 on the receiving area 286. In other words, the bending of the body 224 is performed in the opposite direction to the bending of the body 124 of the first embodiment when the target 100 is mounted on the measuring portion 72C. In the configuration for assembling the target 200 onto the measuring portion 272C, the partitions 238A, 238B of the target body 224 are thus closer to each other and held together with a width smaller than the outer width L290 of the two protrusions 290 before passing the protrusions 290.

[0215] exist Figure 9 and 10 The image shows a target 300 according to a third embodiment of the invention. In the first and third embodiments of the invention, complementary means 88 for connecting the measuring portion 72C includes receiving grooves formed opposite to each other, while the target includes a target protrusion and a groove facing each other. One of the main differences between the third embodiment and the first embodiment is that the complementary means 88 includes a protrusion 390 and a receiving groove 392 extending over a proportionally large area of ​​the measuring portion 72C around the rotation axis XA6, while the target 300 includes partitions 338A and 338B that are proportionally longer than the partitions 138A and 138B of the target 100.

[0216] The separators 338A and 338B, as well as the side flanges 132 and 134, define the receiving volume V300 of the target 300. The receiving volume V300 is configured to receive the receiving area 386 of the receiving measurement section 72C.

[0217] Each of the partitions 338A and 338B includes an internal protrusion 340 at an end remote from the inner surface 126, the internal protrusion 340 extending into the receiving volume V300. The protrusions 340 extend toward each other and define an opening 342 between them, narrowing relative to the receiving volume V300 in the longitudinal plane P100. The distance between the two protrusions 340, measured parallel to the longitudinal plane P100, defines the opening width L342.

[0218] Each of the protrusions 340 is adjacent to a target groove 343, which is disposed on a corresponding partition 338A or 338B between the protrusion 340 and the bottom 127 on the receiving volume V300 side. Two target grooves 343 are separated by a receiving width L343 measured parallel to the longitudinal plane P100. The receiving width L343 has a dimension larger than the opening width L342.

[0219] exist Figure 10 In the image, target 300 is shown as being assembled on the measuring section 72C.

[0220] The receiving area 386 has a shape complementary to the bottom 127 of the target 300 and is configured to receive the target 300 against the bottom 127 when the target 300 is mounted on the measuring part 72C. Here, the receiving area 386 has a cylindrical shape with a circular cross-section centered on the sixth axis of rotation XA6.

[0221] The wall of the measuring portion 72C includes two side portions 389 oriented opposite each other on either side of the receiving wall 386. Each of the two side portions 389 here has a cylindrical shape with a circular cross-section centered on the sixth axis of rotation XA6. The side portions 389 are configured to be received in the target groove 343. By extension, the two side portions 389 form a protrusion 390 of a complementary connecting device 88.

[0222] Two protrusions 390 are oriented opposite to each other and define an outer width L390 between them in the intermediate plane P72. Each protrusion 390 is adjacent to a groove formed in the edge 84, the groove forming a receiving groove 392 configured to interact with the connecting device 122. In a third embodiment of the invention, the two protrusions 390 are located between two receiving grooves 392, wherein the two receiving grooves 392 are opposite to each other.

[0223] The distance L392 between the bottoms of the two receiving recesses 392, measured in the intermediate plane P72 parallel to the outer width L390, is strictly less than the outer width L390 of the two protrusions 390. In other words, the opening width L342 is less than the receiving width L343 of the receiving volume V100 and the outer width L390.

[0224] The receiving width L343 is close to the assembly gap equal to the outer width L390 of the measuring part 72C, while the opening width L342 is close to the assembly gap equal to the distance L392 between the two receiving grooves 392.

[0225] When the target 300 is mounted on the measuring part 72C, the partitions 338A and 338B move apart to accommodate the passage of the receiving wall 386 due to the flexible deformation of the target body 124 and advantageously through the presence of the radial slot 136. Therefore, assembly can be performed by hand without the use of tools.

[0226] The protrusion 390 is advantageously disposed in the continuation of the receiving wall 386, that is, the protrusion 390 and the receiving wall 386 are held by the same circular cross-section cylinder, which is centered on the same axis, here the axis of rotation XA6. For example, the receiving wall 386 (i.e., the measuring portion) following a continuous external contour can be achieved particularly easily by cutting, which is cheaper than machining operations.

[0227] exist Figure 11 The target 400 corresponding to the fourth embodiment of the present invention is shown separately. The target 400 has a similar shape to the target 100 of the first embodiment, but the difference is that the target 400 includes two ferromagnetic portions 401 with different lengths, which are separated by a non-magnetic portion 402.

[0228] The ferromagnetic portion 401 is here made of an insert having a location located Figure 11 The upper insert 403A and the lower insert 403B are located at the top. The upper insert 403A has a length measured parallel to the longitudinal plane P100, which is greater than the length of the insert 403B measured parallel to the same plane.

[0229] The two ferromagnetic portions 401 are separated by a first non-magnetic portion 402A. The lower insert 403B is adjacent to the second non-magnetic portion 402B located between the lower insert 403B and the lower end portion 128B.

[0230] exist Figure 12 The fifth embodiment of the invention is shown below. One of the main differences between the fifth embodiment and the first embodiment is that the third swing rod 73 is replaced by a stabilizer 573. The third actuating rod 66 is omitted. The stabilizer 573 is used to guide the first connecting rod portion 63A during the movement of the traction mechanism 6.

[0231] The stabilizer 573 of the traction mechanism 6 has an elongated shape having a first end 574 and a second opposing end 576, with a hole 575 formed in the first end 574. The hole 575 is configured to receive a bearing so that the stabilizer 573 can be pivotally mounted relative to the loom M about a third pivot axis X3.

[0232] At its second end 576, stabilizer 573 is pivotally mounted relative to the first connecting rod portion 63A about a seventh rotation axis XA7. In other words, stabilizer 573 is hinged between the loom M and the first connecting rod portion 63A. In an alternative embodiment not shown, stabilizer 573 is hinged between the loom M and the second connecting rod portion 63B.

[0233] Stabilizer 573 includes a measuring portion 573A, which is oriented here relative to the hole 575 away from the second end 576 of stabilizer 573. Target 500 is reversibly mounted on the measuring portion 573A of stabilizer 573.

[0234] Regarding the complementary device 88 of the connecting device 122 and the measuring portion 72C of the target 100, the target 500 is similar to the target 100 of the first embodiment of the present invention. In contrast, the target 500 does not include a ferromagnetic insert, but instead includes an insert 503 directly attached to the body 124 of the measuring target 500, and the insert 503 has a ferromagnetic portion 501 and a non-magnetic portion 502. The insert 503 is here made by means of a flexible tongue that is glued to the target body 124.

[0235] The ferromagnetic portion 501 is schematically shown as a black stripe, while the non-magnetic portion 502 is shown as a white stripe. The two consecutive ferromagnetic portions 501 are separated by the non-magnetic portion 502, such that when the stabilizer 573 pivots about the third pivot axis X3, the ferromagnetic portion 501 and the non-magnetic portion 502 alternately pass in front of the sensor 110 facing the target 110.

[0236] In a variant not shown, the traction mechanism 6 includes several sensors 110 capable of interacting with the same target 100 at various angular positions.

[0237] In a variant not shown, the measuring target 100 includes a ferromagnetic insert. Therefore, the target enables the position of the measuring portion to be known via one or more sensors.

[0238] In the illustrated embodiment, each of targets 100 to 500 has a generally symmetrical shape with respect to the transverse plane P101. In other words, connecting device 122 or 222 has a symmetrical shape with respect to the transverse plane P101, while complementary device 88 also has a symmetrical shape with respect to the radial plane P72' of measuring portion 72C, which coincides with the transverse plane P101 when the target is mounted on the corresponding measuring portion. Therefore, the target can be mounted on the measuring portion in two different directions with respect to the transverse plane P101.

[0239] In one variation, the ferromagnetic portion 501 may be replaced by a magnetic portion, such as individual magnets that generate a magnetic field, which can be sensed by associated sensors facing the individual magnets.

[0240] In a variant not shown, the connecting device and the complementary device are asymmetrical with respect to the target's transverse plane P101 and radial plane P72', respectively. Therefore, the target can be mounted on the measuring section in only one direction relative to the radial plane P72'. In other words, the connecting device 122 and the complementary device 88 are configured to assemble the target onto the receiving area (receiving wall) in an oriented manner relative to the radial plane P72'.

[0241] In a variant not shown, the side flange may be formed by a plurality of radial protrusions extending from the respective edges of the body to abut against the side of the measuring portion and being separated from each other such that they replace the radial slots of the side flange to allow buckling of the target body.

[0242] When the ferromagnetic and nonmagnetic parts are arranged asymmetrically with respect to the transverse plane P101, as in the case of objective 400 of the fourth embodiment of the present invention, asymmetrical connection devices and complementary devices are recommended.

[0243] In the illustrated embodiment, complementary connecting means 88 are disposed on the edge 84 of the measuring portion 72C, while connecting means 122 or 222 extend parallel to the longitudinal plane P100.

[0244] In a variant not shown, the connecting device is orthogonally arranged relative to the longitudinal plane P100, while complementary devices are provided on the side of the measuring portion 72C. For example, the mechanical connecting device of the target includes lugs configured to project from a lateral flange and extend on the target receiving space side, while complementary grooves are provided in the first and second sides of the measuring portion. During installation, the lugs of the lateral flanges move away from each other relative to the plane P72' through flexible deformation. When the target is mounted on the measuring portion, the lugs are held in the housing by the flexible recovery of the lateral flanges.

[0245] In other words, the target includes mechanical connecting devices arranged in the extensions of two lateral flanges, these connecting devices being spaced apart by a distance less than or equal to the thickness of edge 84, and the receiving wall includes complementary connecting devices, the complementary connecting devices including grooves arranged in the first and second sides of the measuring portion.

[0246] In the example illustrated, the first swing arm 71 and the second swing arm 72 are connected to each other via a connecting rod 62, which is made of two hinged parts by a first connecting rod portion 63A and a second connecting rod portion 63B, which are guided by a third swing arm 73 or by a stabilizer 573.

[0247] In a variant not shown, the connecting rod 62 is not hinged and the first swing arm 71 is directly connected to the second swing arm 72. In this case, the third swing arm 73 or the stabilizer 573 is optional.

[0248] In the example illustrated, the shed machine 2 is of the mechanical treadle type, wherein each output bar 61 is hinged to the discharge arm 22 of the shed machine 2.

[0249] In an alternative embodiment not shown, the shunt machine is of the mechanical multi-arm type, wherein each output bar 61 is hinged to the discharge arm of the mechanical multi-arm.

[0250] According to another variant not shown, the shunt machine is an electronic multi-arm type, which includes independent electric actuators, such as motors, with oscillating rotational motion, each connected to a crank. Therefore, each output bar 61 is hinged to a corresponding crank. In other words, the crank is hinged between the electric actuator and the corresponding output bar.

[0251] The above embodiments and variations can be combined with each other to generate new embodiments of the present invention.

Claims

1. A traction mechanism (6) for controlling a heald frame (4) of a loom (M) equipped with a shedding machine (2), the traction mechanism (6) comprising, for each heald frame (4): - a bar assembly (60) consisting of a set of connecting rods, - a swing lever (70) coupled to the bar assembly (60) and configured to reproduce the movement (F22) of a discharge arm (22) or of a crank of the shedding machine (2) to the heald frame (4) in order to drive this heald frame (4) in an alternating movement (F4) along a frame axis (Z4) between an upper position and a lower position, wherein the swing lever (70) is associated with the heald frame (4) and comprises a first swing lever (71) and a second swing lever (72), wherein: - the first swing lever (71) is pivotably mounted relative to the loom (M) about a first pivot axis (XI) orthogonal to a frame plane (P4), - the second swing lever (72) is pivotably mounted relative to the loom about a second pivot axis (X2) parallel to the first pivot axis (XI), wherein the bar assembly (60) comprises: - a main connecting rod (61) configured to be connected to the discharge arm (22) or to the crank about a first joint (Al) constituting a pivot connection about a rotation axis (XA1) parallel to the first pivot axis (XI), - a first actuation rod (64) configured to be connected to a first end (40) of the heald frame (4) and intended to drive the heald frame (4) in movement along the frame axis (Z4), - a second actuation rod (65) configured to be connected to a second end (41) of the heald frame (4) and intended to drive the heald frame (4) in movement along the frame axis (Z4), - at least one connecting rod (62) connecting the first swing lever (71) to the second swing lever (72) and intended to drive the second swing lever (72), wherein the first swing lever (71): - is connected to the main connecting rod (61) about a second joint (A2) constituting a pivot connection about a rotation axis (XA2) parallel to the first pivot axis (XI), - is intended to drive the first actuation rod (64) via a third joint (A3) and the at least one connecting rod (62) via a fourth joint (A4), the third joint (A3) and the fourth joint (A4) each constituting a pivot connection about a respective rotation axis (XA3, XA4) parallel to the first pivot axis (XI), wherein the second swing lever (72): - is hinged to the at least one connecting rod (62) about a fifth joint (A5), - aimed at driving said second actuation rod (65) via a sixth joint (A6), said fifth joint (A5) and said sixth joint (A6) each constituting a pivoting connection about a respective axis of rotation (XA5, XA6) parallel to said first pivoting axis (X1), wherein said traction mechanism (6) comprises at least one measuring portion (72C; 272C; 573A) equipped with a target (100; 200; 300; 400; 500) configured to interact with a sensor (110), characterized in that each measuring portion (72C; 272C; 573A) is arranged on a peripheral wall of one element chosen from the following: - said first oscillating lever (71), - said second oscillating lever (72), - a third oscillating lever (73) or a stabilizer (573) of said traction mechanism (6), each mounted so as to pivot with respect to said weaving machine (M) about a third pivoting axis (X3) parallel to said first pivoting axis (X1) and articulated to said at least one connecting rod (62), and wherein said target is reversibly mounted on said measuring portion.

2. The traction mechanism (6) according to claim 1, characterized in that said measuring portion (72C; 573A) comprises: - a first side (80) and a second side (82) opposite said first side, said first side (80) and second side (82) defining between them a median plane (P72) orthogonal to said first pivoting axis (X1), - an edge (84) connecting said first side to said second side with a constant thickness (E72), and wherein said edge defines a receiving area (86; 286; 386) configured to radially receive said target (100; 200; 300; 400; 500) with respect to the pivoting axis (X1, X2, X3) of the corresponding element (71, 72, 73, 573).

3. The traction mechanism (6) according to claim 2, characterized in that said receiving area (86; 286; 386) has a substantially convex shape in said median plane (P72), wherein said measuring portion (72C; 272C; 573A) is arranged: - on one end of an arm (712, 713) of said first oscillating lever (71) or of said second oscillating lever (72) or of said third oscillating lever (73), - or around the first pivoting axis (X1) of said first oscillating lever (71) or around the second pivoting axis (X2) of said second oscillating lever (72) or around the third pivoting axis of said third oscillating lever, - or even on one end (574) of said stabilizer (573).

4. A traction mechanism (6) according to claim 2 or 3, characterized in that said target (100; 200; 300; 400; 500) comprises: - a target body (124), • said target body (124) extends between a first end (128A) and a second end (128B) and between two parallel edges (130A, 130B) located on either side of a longitudinal plane (P100) which, when said target is mounted on said measuring portion (72C; 573A), coincides with said median plane (P72), • said target body (124) comprises an inner surface (126) configured to be mounted and to interact with said receiving area (86; 286; 386) and an outer surface (120) opposite to said inner surface and oriented towards said sensor (110), said outer surface being geometrically defined by a cylinder (P120) with circular cross section and centered on a target axis (A100) which coincides with one of the first, second or third pivot axes corresponding to one of the first, second or third swing levers or stabilizers on which said target is mounted, - two lateral flanges (132, 134), • said two lateral flanges (132, 134) each extend from the respective edge (130A, 130B) of said target body (124) parallel to said longitudinal plane (P100), and • said two lateral flanges (132, 134) are configured to be supported on said first and second lateral faces (80, 82), wherein said target body and said two lateral flanges delimit a receiving volume (V100; V200; V300) of said receiving area (86; 286; 386) which is open by an opening (135; 235) centered on said longitudinal plane (P100) and having a width substantially equal to the thickness (E72) of said edge (84) measured orthogonally to said longitudinal plane, and wherein said target (100; 200; 300; 400; 500) is provided with mechanical connection means (122; 222): - said mechanical connection means (122; 222) interact with said measuring portion (72C; 272C; 573A) in order to set said target to this measuring portion, and - said mechanical connection means (122; 222) are arranged at each first or second end (128A, 128B) of said target body (124) and / or in the extension of said lateral flanges (132, 134).

5. Traction mechanism (6) according to claim 4, characterized in that: - said target body (124) is made of synthetic polymer material, - said lateral flanges (132, 134) each comprise: • a lateral face extending parallel to said longitudinal plane (P72), • and radial slots (136) provided on the lateral faces up to the inner face (126), the radial slots being arranged so that, when the target is mounted or dismounted on the measuring portion (72C; 272C; 573A), the target body is flexibly deformed in its longitudinal plane (P100) by tangential bending so as to move the mechanical connection means (122; 222) away from or towards each other.

6. The traction mechanism (6) according to claim 4, characterized in that The receiving area (86; 286; 386) comprises complementary connection means (88) for connection to the mechanical connection means (122; 222) of the target (100; 200; 300; 400; 500), the complementary connection means being configured to interact with the mechanical connection means so as to place the target (100; 200; 300; 400; 500) on the measuring portion (72C; 573A).

7. The traction mechanism (6) according to claim 4, characterized in that The target comprises mechanical connection means arranged in extensions of the two lateral flanges (132, 134), the mechanical connection means being separated by a distance less than the thickness (E72) of the edge (84), while the measuring portion (72C) comprises complementary connection means comprising grooves arranged in the first and second lateral faces (80, 82) of the measuring portion (72C) and configured to interact with the mechanical connection means so as to place the target (100; 200; 300; 400; 500) on the measuring portion (72C).

8. The traction mechanism (6) according to claim 4, characterized in that The inner face (126) of the target body (124) has a shape complementary to the receiving area (86; 286; 386) and forms an abutment means of the receiving area.

9. The traction mechanism (6) according to claim 8, characterized in that: - the mechanical connection means (122) comprise: • two partitions (138A, 138B; 338A, 338B) extending from each of the first and second end portions (128A, 128B) of the target body (124) towards the opening (135), and • two target grooves (143; 343), each target groove (143; 343) adjoining one partition on one side of the opening, - each of the partitions comprises, on one side of the opening, an internal protrusion (140; 340) extending towards the other and defining, between them, in the longitudinal plane (P100), a mouth (142; 342) having a mouth width (L142; L342) measured parallel to the longitudinal plane (P100), the mouth width (L142; L342) being less than a receiving width (L143; L343) measured between the two target grooves (143; 343), - the complementary connection means (88) comprise: • two radially projecting protrusions (90; 390) distanced from each other and defining between them, in the median plane (P72), an outer width (L90; L390) greater than the mouth width (L142; L342), and • two grooves formed in the edge (84), each groove adjoining one protrusion and each forming a receiving groove (92; 392) for a respective partition (140; 340) internal protrusion, wherein the partitions and the radially projecting protrusions are configured so that, in an assembled configuration with the target (100; 300; 500) on the measuring portion (72C; 573A), each of the internal protrusions (140; 340) is positioned in one of the receiving grooves (92; 392) and each of the two radially projecting protrusions (90; 390) is positioned in one of the target grooves (143; 343), and wherein the target is configured to be removed from the measuring portion by reversible flexible deformation of the target body (124).

10. The traction mechanism (6) according to claim 8, characterized in that: ▪ the mechanical connection means (222) comprise: - two partitions (238A, 238B) provided in the form of protrusions at each of the lower and upper ends (228A, 228B) of the target body (124), and - two target grooves (242) each adjoining one partition opposite the opening (235), each of the partitions comprising an external protrusion (240) at an end distanced from the inner surface, the two external protrusions extending opposite each other and defining between them, in the longitudinal plane: • a maximum width (L240) measured parallel to the longitudinal plane (P200), and • a receiving width (L242) measured between the two target grooves (242), the receiving width (L242) being less than the maximum width, ▪ the complementary connection means (88) comprise: - two radially projecting protrusions (290) directed toward each other and defining, in the median plane (P72), an outer width (L290) less than the maximum width (L240) of the partitions of the target, - two grooves arranged in the edge (84), each groove adjoining one radially projecting protrusion (290) and each forming a receiving groove (292), the projecting partitions (238A, 238B) and the radially projecting protrusions (290) being configured so that, in an assembled configuration with the target (200) on the measuring portion (72C; 573A), each partition is positioned in one of the receiving grooves (292) and the protrusions (290) are positioned in the target grooves (242), and said target is configured to be removed from said measuring portion by a reversible flexible deformation of said target body (124).

11. The traction mechanism (6) according to claim 9, characterized in that Said radially protruding protrusions (290) and wall grooves each have a profile with a radius of curvature greater than 2 mm.

12. The traction mechanism (6) according to claim 4, characterized in that Said outer surface (120) of each target (100; 200; 300; 400; 500) comprises at least one ferromagnetic portion (101; 401; 501) and at least one non-magnetic portion (102; 402; 502), each ferromagnetic portion adjoining one non-magnetic portion of said target. Said target (100; 200; 300) comprises two ferromagnetic portions (101) having equal length, said two ferromagnetic portions (101) being separated by a non-magnetic portion (102).

13. The traction mechanism (6) according to claim 12, characterized in that Said target (400) comprises two ferromagnetic portions (401) having different length, said two ferromagnetic portions (401) having different length being separated by a non-magnetic portion (402).

14. The traction mechanism (6) according to claim 12, characterized in that Said receiving area (86; 286; 386) comprises complementary connection means (88) for connecting to said mechanical connection means (122; 222) of said target (100; 200; 300; 400; 500), said complementary connection means being configured to interact with said mechanical connection means in order to set said target (100; 200; 300; 400; 500) on said measuring portion (72C; 573A), wherein said mechanical connection means (122; 222) of said target (100; 200; 300; 400; 500) and said complementary connection means (88) of said measuring portion (72C; 573A):

15. The traction mechanism (6) according to claim 14, characterized in that - are asymmetric with respect to a transversal plane (P101) of said target, said transversal plane being radial with respect to said target axis (A100) and determining an upper target portion and a lower target portion having similar volumes, and - are configured to assemble said target to said measuring portion in a directional manner.

16. The traction mechanism (6) according to claim 12, characterized in that: 286，386）。 - each ferromagnetic portion (101; 401) of each target (100; 200; 300; 400) comprises an insert (103; 403) made of ferromagnetic material, whereas said target body (124) is made of non-magnetic material, - each insert comprises an outer surface (104), said outer surface (104) of the insert being geometrically held by the cylinder (P120) defining the outer surface (120) of the target, - said measuring portion (72C) is contained in the cylinder (P120) defining the outer surface (120) of the target. Said outer surface (104) of at least one insert (103, 403) is defined in said longitudinal plane (P100) of said target (100; 200; 300; 400) between two edges (106) that are sharp and parallel to said target axis (A100).

17. A traction mechanism (6) according to claim 16, characterized in that Said target (100; 200; 300) comprises two ferromagnetic portions (101) having equal length, said two ferromagnetic portions (101) being separated by a non-magnetic portion (102). Said target (400) comprises two ferromagnetic portions (401) having different length, said two ferromagnetic portions (401) having different length being separated by a non-magnetic portion (402). Said receiving area (86; 286; 386) comprises complementary connection means (88) for connecting to said mechanical connection means (122; 222) of said target (100; 200; 300; 400; 500), said complementary connection means being configured to interact with said mechanical connection means in order to set said target (100; 200; 300; 400; 500) on said measuring portion (72C; 573A), wherein said mechanical connection means (122; 222) of said target (100; 200; 300; 400; 500) and said complementary connection means (88) of said measuring portion (72C; 573A): - are asymmetric with respect to a transversal plane (P101) of said target, said transversal plane being radial with respect to said target axis (A100) and determining an upper target portion and a lower target portion having similar volumes, and - are configured to assemble said target to said measuring portion in a directional manner.

18. The traction mechanism (6) according to any one of claims 1 to 3, characterized in that Each sensor (110) faces a target (100; 200; 300; 400; 500) of the measuring portion (72C; 272C; 573A) fixedly mounted with respect to the frame (B) of the weaving machine (M).

19. The traction mechanism (6) according to claim 18, characterized in that The outer surface (120) of each target (100; 200; 300; 400; 500) comprises at least one ferromagnetic portion (101; 401; 501) and at least one non-magnetic portion (102; 402; 502), each ferromagnetic portion adjoining one non-magnetic portion of the target, and wherein one or more ferromagnetic portions (101; 401; 501) and one or more non-magnetic portions (102; 402; 502) of the same target (100; 200; 300; 400; 500) together form a detection zone extending along an angular sector greater than the angular travel of the target when the measuring portion (72C; 272C; 573A) on which it is mounted is pivoted between its high and low positions.

20. A loom (M) equipped with a shed machine (2), characterized in that, The shed machine comprises a drawing-in mechanism (6) according to any one of claims 1 to 4.

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