A flexible card clothing for fluff cotton fibers and a method for controlling sliver uniformity

Abstract

The application discloses a flexible carding cloth for flocculent cotton fibers and a sliver uniformity control method, relates to the technical field of cotton fiber carding, and is based on a base plate and needle teeth uniformly arranged in the warp and weft directions; the end of each needle tooth is in universal hinged connection with a fixed ball sleeve on the base plate through a ball bearing, bidirectional angular deflection in the weft and radial directions can be realized, a plurality of carding gaps with transverse arc plates are arranged on the working surface of the needle tooth, adjacent needle teeth are connected through connecting rods distributed in a rectangular shape, and wing plates are arranged on the outer wall of the connecting rods in a diagonal distribution. The application realizes real-time dynamic regulation and control of carding force through linkage of bidirectional self-adaptive deflection of the needle teeth, progressive staged carding and self-balancing of stress of the full needle row, realizes full-process flexible carding of the flocculent cotton fibers, effectively reduces fiber damage and the short fiber rate, significantly improves sliver uniformity, simultaneously reduces needle tooth loss, and prolongs the service life of the carding cloth.

Description

Technical Field

[0001] This invention relates to the field of cotton fiber carding technology, specifically to a flexible carding cloth for fibrous cotton fibers and a method for controlling the uniformity of sliver formation. Background Technology

[0002] As one of the key structures in a carding machine, the flexible carding needle cloth is essentially a flexible metal strip with densely arranged tiny steel needles. With the rotational motion, the steel needles pierce and grasp the fiber bundles in an interlaced manner. The cover plate needle cloth and the cylinder needle cloth are arranged in parallel, and their relative movement forms "repeated fine combing", which gradually decomposes the fiber bundles into individual strands. For reference, see the technical issues involved in publication number CN110835792A.

[0003] Flexible carding cloth can be fixed to the roller surface or form a "belt" drive-like operation to achieve fiber carding. Traditional carding cloth needles and substrates are mostly rigidly connected without a buffer structure. They mainly rely on the flexibility of the flexible metal belt itself. As a result, the needles cannot adaptively adjust according to the size of the fiber bundle during carding, which can easily lead to over-carding or insufficient carding of local fibers. In addition, uneven tension during carding cloth wrapping can easily cause needle drop and loosening, affecting carding stability and carding cloth life. Especially for excessively clumped cotton fibers, the rigidly connected needles do not complete carding in a gradual combing manner. Instead, they form a form similar to "forced cutting", which leads to high loss problems such as short fibers.

[0004] To address this issue, the present invention proposes a solution. Summary of the Invention

[0005] The purpose of this invention is to provide a flexible carding cloth for fibrous cotton fibers and a method for controlling the uniformity of sliver formation. The main issue is that most of the needles in the flexible carding cloth are rigidly connected, so the needles cannot adaptively adjust according to the size of the fiber bundle during carding, which can easily lead to over-carding or insufficient carding of local fibers, or even carding in the form of "forced cutting".

[0006] The objective of this invention can be achieved through the following technical solution: a flexible carding cloth for fibrous cotton fibers, comprising a substrate and needle teeth, wherein the needle teeth are evenly arranged on the substrate along the warp and weft directions, and a ball is installed at the end of each needle tooth, and a fixing ball sleeve corresponding to the ball is provided on the substrate.

[0007] Multiple combing notches are provided on one side of the outer arc edge of the needle tooth along its arc direction. A transverse arc plate is installed at the upper part of each combing notch, and the opening direction of the combing notch corresponds to the combing direction of the needle cloth. The transverse arc plate is in a downward curved arc shape along the thickness direction of the needle tooth. Each needle tooth is connected by four connecting rods along its thickness direction.

[0008] The further configuration is as follows: each of the fixed ball sleeves is hinged together along the combing direction of the needle cloth by a hinge rod, and the lower end of each fixed ball sleeve is mounted on the base plate. A section rod is connected between the center points of the outer wall of each fixed ball sleeve along the thickness direction of the needle teeth and is rotatably connected by the section rod.

[0009] A further configuration is provided: a limiting block is installed on the outer wall of the upper part of the fixed ball sleeve corresponding to the ball, and the limiting block is arranged parallel to the combing direction of the needle cloth.

[0010] The setting is further configured such that the opening arc of each comb notch gradually increases from bottom to top.

[0011] The configuration is further defined as follows: the four connecting rods are distributed in a rectangular shape along the thickness direction of the needle teeth, and a wing plate is provided on the outer wall of the connecting rod located between two adjacent needle teeth. Sliding sleeves are installed at both ends of the wing plate, and the sliding sleeves are slidably connected to the connecting rod.

[0012] Further configuration: the needle teeth are provided with notches corresponding to the connecting rods, the diameter of the notches is larger than the outer diameter of the connecting rods, and the wing plate is in an outward curved arc shape along the direction of the needle cloth combing line.

[0013] The configuration is further defined as follows: the number of wing plates corresponding to the outer walls on both sides of the needle tooth is two, and the two wing plates are diagonally distributed along the four connecting rods.

[0014] The configuration is further defined as follows: the two winglets on both sides of a single needle tooth are diagonally distributed in opposite ways.

[0015] This invention also proposes a method for controlling the uniformity of sliver formation in flexible carding cloth for fibrous cotton fibers. When the carding cloth is used in conjunction with a carding machine for directional carding, the following action trends are included:

[0016] Action Trend 1: The needle cloth moves directionally in the direction pointing to the combing notch. After contacting the fluffy cotton fibers, it combs the fluffy fibers with the transverse arc plate in the combing notch. The needle teeth generate a reaction force after contacting the fluffy fibers and deflect at a fixed angle in the weft direction under the action of the fixed ball sleeve and the ball.

[0017] Action Trend Two: Based on Action Trend One, the flocculent fibers come into contact with the transverse arc plate and generate a reaction force along the thickness direction of the needle teeth. According to the direction of the reaction force, the needle teeth cooperate with the fixed ball sleeve and the ball to deflect in the opposite direction at a fixed angle in the radial direction.

[0018] Action Trend 3: Under the combined effect of Action Trends 1 and 2, the needle teeth simultaneously deflect in the opposite angle along the latitudinal and radial directions. During the reverse deflection action, the needle teeth in a single position generate mixed stress on the wing plate and connecting rod. The mixed stress generated by each needle tooth is balanced by the elastic deformation of the connecting rod and wing plate.

[0019] The present invention has the following beneficial effects:

[0020] 1. This invention achieves gradual loosening and grading of fiber bundles through a gradually opening combing notch with a transverse arc plate, replacing the traditional single-tooth forced piercing combing method. This avoids rigid cutting of fibers and significantly reduces the short fiber rate and nipple residue during the combing process. The surface contact structure design of the transverse arc plate reduces mechanical damage to the fiber surface and improves fiber length utilization. The needles can achieve bidirectional adaptive deflection in the weft and radial directions according to the fiber force, optimizing the combing angle and fiber layer insertion depth in real time. Combined with the stress self-balancing structure of the entire needle row formed by the connecting rod and diagonally distributed wing plates, it ensures uniform combing force across the entire combing surface, significantly reducing the evenness and weight unevenness of the sliver. At the same time, the wing plates can provide auxiliary support and sorting for floating fibers, reducing effective fiber loss and cotton waste.

[0021] 2. By using the universal hinge structure of the ball bearing and the fixed ball sleeve, the rigid fixed connection between the traditional needle tooth and the substrate is replaced. The concentrated force of a single needle tooth can be distributed to the adjacent needle teeth through the linkage structure of the fixed ball sleeve, avoiding the problems of needle breakage, needle drop, and collapse caused by overload of a single needle. With the precise limiting of the maximum deflection angle of the needle tooth by the limiting block, it not only ensures the adaptive deflection space of the needle tooth to adapt to different specifications of fiber bundles, but also avoids the loss of gripping force and failure caused by excessive deflection of the needle tooth, ensuring the continuous and stable combing process. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a flexible carding cloth for fibrous cotton fibers and a method for controlling the uniformity of sliver formation proposed in this invention.

[0024] Figure 2 For the present invention Figure 1 Schematic diagram of the structure of the central needle tooth;

[0025] Figure 3 For the present invention Figure 2 The front view;

[0026] Figure 4 For the present invention Figure 1 A schematic diagram of the structure of the airfoil corresponding to the central needle tooth;

[0027] Figure 5 For the present invention Figure 4 Top view;

[0028] Figure 6 This is a schematic diagram of the arrangement of the needle teeth in this invention.

[0029] In the diagram: 1. Base plate; 2. Needle teeth; 3. Transverse arc plate; 4. Comb notch; 5. Ball bearing; 6. Limiting block; 7. Fixing ball sleeve; 8. Connecting rod; 9. Wing plate. Detailed Implementation

[0030] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1: In the cotton spinning process, the carding of fibrous cotton fibers is the core process that determines the quality of the sliver and the subsequent spinning performance. The traditional flexible carding cloth is the core working component of the carding machine. It uses a flexible metal base belt as the substrate 1 and has a dense array of rigid needle teeth 2 on the surface of the substrate 1. When in use, the carding cloth is wrapped around the rollers of the cylinder and cover plate of the carding machine. Through the relative movement of the cylinder and cover plate, the needle teeth 2 pierce the fibrous cotton fiber bundles in an alternating manner, gradually decomposing the agglomerated fiber bundles into individual fibers, thus completing the fiber carding, impurity removal and uniform mixing. This part is the conventional process principle.

[0032] However, in existing flexible carding fabrics, the needle teeth 2 and the substrate 1 are rigidly fixed, and can only rely on the deformation of the metal base belt itself to achieve a small amount of buffering. There is no independent adaptive adjustment structure. When encountering cotton fibers of uneven thickness and local clumps, the needle teeth 2 cannot adjust the carding angle and insertion depth in real time according to the specifications of the fiber bundle. This can easily lead to problems such as excessive carding and cutting of local fibers, a significant increase in the short fiber rate, or insufficient carding of local fiber bundles and cotton knots remaining. This directly results in poor uniformity of cotton slivers and excessive unevenness in yarn and weight. At the same time, uneven tension is prone to occur during the carding fabric wrapping process. The rigidly connected needle teeth 2 are subjected to concentrated force, and long-term operation can easily lead to problems such as needle drop, needle breakage, and loosening and collapse of the needle teeth 2, resulting in a short service life of the carding fabric.

[0033] To address the core deficiencies of the existing technology, this embodiment proposes the following solution: using a bidirectional adaptive deflection needle tooth 2 installation structure as the core, specifically deflection along the warp and weft directions, combined with a progressive combing structure and a multi-needle stress linkage balance structure, to achieve flexible adaptive combing of fibrous cotton fibers.

[0034] Specifically, this solution installs the needle teeth 2 on the substrate 1 through the cooperation structure of the fixed ball sleeve 7 and the ball 5, so that the needle teeth 2 can achieve bidirectional fixed angle deflection in the weft and radial directions according to the fiber force, replacing the traditional rigid fixing method and fundamentally solving the problem that the needle teeth 2 cannot adaptively fine adjust; multiple combing notches 4 with transverse arc plates 3 are set on the combing working surface of the needle teeth 2 to achieve progressive grading and combing of the fiber bundle, avoiding forced cutting of the fiber;

[0035] Meanwhile, the connecting rod 8 that runs through the needle tooth 2 and the diagonally distributed wing plates 9 realize the force linkage and stress self-balance of adjacent needle teeth 2, ensuring that the carding force of the needle teeth 2 on the entire carding surface is uniform and consistent. Through the action logic of the bidirectional adaptive deflection of the needle teeth 2 and the multi-needle stress linkage balance, the carding force is dynamically adjusted in real time. In the end, while reducing fiber damage and extending the life of the carding cloth, the uniformity of sliver formation is greatly improved.

[0036] Example 2: This example illustrates the specific application of the flexible carding cloth for fibrous cotton fibers. The flexible carding cloth of this invention is applied to the carding cloth of the cover plate of a cotton carding machine. The base plate 1 is made of a 0.8mm thick flexible alloy steel strip, and the needles 2 are made of high-carbon steel, evenly arrayed along the warp and weft directions on the surface of the base plate 1. The carding cloth is wrapped around the surface of the carding machine cover plate roller, forming a carding zone in conjunction with the cylinder carding cloth. The carding target is fibrous cotton fibers that have undergone the opening and cleaning process. The following details the operation of each component in conjunction with the entire carding process:

[0037] After the carding machine starts running, the base plate 1 moves in a circular motion with the cover plate / roller shaft, driving the card cloth to move in a stable relative motion with the cylinder card cloth along the opening direction of the carding gap 4, and gradually enter the carding zone between the cylinder and the cover plate. After the fibrous cotton fibers enter the carding zone along the cylinder surface, they first come into contact with the outer arc edge working surface of the needle teeth 2. Driven by the relative movement, the fiber bundles are sequentially inserted into the multiple combing notches 4 opened along the arc direction of the outer arc edge of the needle teeth 2. In this embodiment, the opening arc of the combing notches 4 gradually increases from bottom to top. The fiber bundles are initially grasped and limited by the combing notches 4 with smaller openings at the lower end. As the needle cloth moves, the fiber bundles gradually move towards the upper end of the needle teeth 2 and sequentially enter the combing notches 4 with larger openings, completing the step-by-step loosening and combing of the fiber bundles. This replaces the traditional single-tooth forced puncture combing method of the needle teeth 2, fundamentally avoiding the problem of the fiber bundles being rigidly pulled and cut, and significantly reducing the short fiber generation rate during the combing process. At the same time, the multiple combing notches 4 can achieve graded grasping of fiber bundles of different thicknesses and lofts, avoiding insufficient combing caused by the slippage of large fiber bundles, and effectively reducing the cotton knots and filaments remaining in the sliver.

[0038] After the fiber bundle enters the combing notch 4, it comes into full contact with the transverse arc plate 3 installed at the upper end of the combing notch 4. The transverse arc plate 3 is curved downward along the thickness direction of the needle tooth 2, forming a surface contact grip with the fiber surface, rather than the line contact scraping of the traditional needle tooth 2 edge. Under the action of relative motion, the fiber bundle slides smoothly along the downward curved surface of the transverse arc plate 3, and the individual fibers are gradually straightened and arranged in parallel. While ensuring stable fiber gripping force and avoiding fiber slippage, it greatly reduces the mechanical damage of the needle tooth 2 to the fiber surface and improves the fiber length utilization rate.

[0039] At the same time, the downward-curved transverse arc plate 3 forms a multi-layer "combing interface" in the thickness direction of the needle teeth 2, which can realize synchronous combing of the entire cross section in the thickness direction of the fiber bundle. This avoids the problem of insufficient combing of the inner layer of the fiber bundle caused by traditional single-plane combing, further improving the uniformity and fullness of combing, and laying the foundation for the uniformity of sliver formation.

[0040] During the process of the needle teeth 2 gripping and combing the fiber bundles, the fibers will generate a weft reaction force on the needle teeth 2 opposite to the combing direction, and a radial reaction force perpendicular to the thickness direction of the needle teeth 2 through the "combing section" formed by the transverse arc plate 3. At this time, the ball 5 at the end of the needle teeth 2 forms a universal hinge with the fixed ball sleeve 7 on the substrate 1. The ball 5 rotates at a certain angle in the fixed ball sleeve 7 according to the direction of the force, and synchronously drives the needle teeth 2 to achieve bidirectional adaptive deflection.

[0041] The reaction force along the weft direction causes the needle teeth 2 to deflect at a fixed angle in the weft direction, adjusting the combing angle of the needle teeth 2 in real time, so that the working surface of the needle teeth 2 and the direction of the fiber bundle always maintain the optimal contact angle, avoiding rigid collision between the needle teeth 2 and the fiber bundle. The reaction force along the radial direction causes the needle teeth 2 to deflect at a fixed angle in the radial direction, adjusting the insertion depth of the needle teeth 2 into the fiber layer in real time, avoiding fiber cutting caused by excessive puncture of the fiber layer by the needle teeth 2, or insufficient gripping force caused by insufficient insertion depth. The adjacent fixed ball sleeves 7 are kept hinged along the combing direction by a hinge rod, and kept rotating connected along the thickness direction of the needle teeth 2 by a link rod, so that the deflection action of the adjacent needle teeth 2 forms a linkage. The concentrated force of a single needle tooth 2 can be distributed to multiple adjacent needle teeth 2 through the linkage structure of the fixed ball sleeves 7. This not only avoids the problem of needle breakage and needle drop caused by overload of a single needle, greatly extending the service life of the card cloth, but also ensures that the deflection amplitude of the needle teeth 2 in the entire combing surface is uniform and consistent, avoiding uneven sliver thickness caused by excessive difference in combing force of local needle teeth 2.

[0042] During the bidirectional deflection of the needle teeth 2, the limiting block 6, which is parallel to the combing direction on the outer wall of the ball 5, can precisely limit the maximum deflection angle of the needle teeth 2. When the deflection amplitude of the needle teeth 2 reaches the preset threshold, the limiting block 6 abuts against the upper end face of the fixed ball sleeve 7, preventing the needle teeth 2 from continuing to deflect. This ensures that the needle teeth 2 have sufficient adaptive deflection space to adapt to the combing needs of different fiber bundles, and avoids the problem of loss of fiber holding force and failure of the needle teeth 2 due to excessive deflection, thus ensuring the stability and continuity of the combing process.

[0043] At the same time, adjacent needle teeth 2 are connected by four rectangular connecting rods 8 through the thickness direction. When adjacent needle teeth 2 deflect at different amplitudes due to uneven fiber stress, the needle teeth 2 will generate mixed stress of tension and torsion on the connecting rods 8. The connecting rods 8 will generate a small amount of elastic deformation, which will transfer the force of the single needle to the adjacent needle teeth 2.

[0044] In this embodiment, the outer wall of the connecting rod 8 between adjacent needle teeth 2 is provided with a wing plate 9. The two ends of the wing plate 9 are slidably connected to the connecting rod 8 through a sliding sleeve. The two wing plates 9 on both sides of a single needle tooth 2 are diagonally distributed along the four connecting rods 8, and the diagonal distribution of the wing plates 9 on both sides of a single needle tooth 2 is opposite. When the connecting rod 8 deforms and displaces, the wing plate 9 slides along the connecting rod 8 with the sliding sleeve, and at the same time, it undergoes bending elastic deformation. After the deformation of multiple sets of diagonally distributed wing plates 9, they form a counterbalancing reverse tension, which transmits the uneven force of a single needle tooth 2 to all needle teeth 2 of the entire needle row through the structure of the connecting rod 8 and the wing plate 9, realizing the stress self-balancing of the entire needle row. This ensures that the combing force of all needle teeth 2 in the entire combing area remains uniform. No matter how the bundle size and fluffiness of the wavy cotton fibers fluctuate, a stable and uniform combing effect can be obtained, which fundamentally reduces the weight unevenness of short and long segments of the cotton sliver and the unevenness of the yarn, and significantly improves the uniformity of the sliver. In addition, the wing plate 9 is curved outward along the combing direction. During the movement of the connecting rod 8, it can assist in supporting and sorting the floating fibers between the needle teeth 2, preventing the fibers from sinking and accumulating to form knots. At the same time, it reduces the loss of effective fibers, lowers the cotton waste rate, and improves the utilization rate of raw materials.

[0045] In summary, the three actions of needle teeth 2—weft-direction adaptive deflection, radial-direction adaptive deflection, and stress self-balancing across the entire needle row—are linked and respond synchronously in real time throughout the carding process. This forms a purely mechanical adaptive sliver uniformity control system that requires no additional electronic control components. By dynamically adjusting the carding posture of needle teeth 2 and the carding force distribution across the entire needle surface through the reaction force of the fibers on needle teeth 2 during carding, flexible carding of fibrous cotton fibers is achieved throughout the entire process. This significantly improves the sliver uniformity and overall quality while reducing fiber damage and extending the service life of the carding cloth, thus providing a high-quality raw material foundation for subsequent drawing, roving, and spinning processes.

[0046] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A flexible carded fabric for fibrous cotton fibers, comprising a substrate (1) and needles (2), characterized in that, The needle teeth (2) are evenly arranged on the substrate (1) along the warp and weft directions, and a ball (5) is installed at the end of each needle tooth (2). A fixed ball sleeve (7) corresponding to the ball (5) is provided on the substrate (1). Multiple combing notches (4) are provided on one side of the outer arc edge of the needle tooth (2) along its arc direction. A transverse arc plate (3) is installed on the upper part of each combing notch (4), and the opening direction of the combing notch (4) corresponds to the combing direction of the needle cloth. The transverse arc plate (3) is in a downward curved arc shape along the thickness direction of the needle tooth (2). Four connecting rods (8) are connected through each needle tooth (2) along its thickness direction.

2. The flexible carding cloth for fibrous cotton fibers according to claim 1, characterized in that, Each of the fixed ball sleeves (7) is hinged along the combing direction of the needle cloth by a hinge rod, and the lower end of each fixed ball sleeve (7) is mounted on the base plate (1). Each of the fixed ball sleeves (7) is connected to the center point of the outer wall along the thickness direction of the needle teeth (2) by a connecting rod, and is rotatably connected by the connecting rod.

3. The flexible carding cloth for fibrous cotton fibers according to claim 2, characterized in that, The ball (5) is fitted with a limiting block (6) on the outer wall of the upper part of the fixed ball sleeve (7), and the limiting block (6) is arranged parallel to the combing direction of the needle cloth.

4. The flexible carding cloth for fibrous cotton fibers according to claim 3, characterized in that, The opening arc of each comb notch (4) gradually increases from bottom to top.

5. The flexible carding cloth for fibrous cotton fibers according to claim 4, characterized in that, The four connecting rods (8) are distributed in a rectangular shape along the thickness direction of the needle teeth (2), and a wing plate (9) is provided on the outer wall of the connecting rod (8) located in the middle of two adjacent needle teeth (2). Sliding sleeves are installed at both ends of the wing plate (9), and the sliding sleeves are slidably connected to the connecting rod (8).

6. The flexible carding cloth for fibrous cotton fibers according to claim 5, characterized in that, The needle tooth (2) has a notch corresponding to the connecting rod (8), the diameter of the notch is larger than the outer diameter of the connecting rod (8), and the wing plate (9) is in the shape of an outward curved arc along the direction of the needle cloth combing line.

7. The flexible carding cloth for fibrous cotton fibers according to claim 6, characterized in that, The number of wing plates (9) corresponding to the outer walls on both sides of the needle tooth (2) is two, and the two wing plates (9) are diagonally distributed along the four connecting rods (8).

8. The flexible carding cloth for fibrous cotton fibers according to claim 7, characterized in that, The two wing plates (9) on both sides of a single needle tooth (2) are diagonally distributed in opposite ways.

9. A method for controlling the uniformity of sliver formation in a flexible carding cloth for fibrous cotton fibers, using the flexible carding cloth for fibrous cotton fibers as described in claim 8, characterized in that... When the needle cloth is used in conjunction with the combing machine for directional combing, the following movement trends are included: Action trend 1: The needle cloth moves in the direction of the combing gap (4). After contacting the fluffy cotton fibers, it combs the fluffy fibers with the transverse arc plate (3) in the combing gap (4). The needle teeth (2) generate a reaction force after contacting the fluffy fibers, and under the action of the fixed ball sleeve (7) and the ball (5), it deflects in the opposite direction at a fixed angle along the weft. Action Trend 2: Based on Action Trend 1, the flocculent fibers come into contact with the transverse arc plate (3) and generate a reaction force along the thickness direction of the needle teeth (2). According to the direction of the reaction force, the needle teeth (2) cooperate with the fixed ball sleeve (7) and the ball (5) to deflect in the opposite direction at a fixed angle in the radial direction. Action Trend 3: Under the combined action of Action Trend 1 and 2, the needle tooth (2) deflects in the opposite angle along the latitudinal and radial directions at the same time. The needle tooth (2) in a single position generates mixed stress on the wing plate (9) and the connecting rod (8) during the reverse deflection action. The mixed stress generated by each needle tooth (2) is balanced by the elastic deformation of the connecting rod (8) and the wing plate (9).

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