A backstitch system, a triangular mechanism, and a head assembly for a flat knitting machine

Abstract

The present invention relates to a backstitch system, a triangle mechanism and a head assembly for a flat knitting machine. The backstitch system is installed on a triangle base plate, and a triangle knitting assembly is installed on the triangle base plate. The backstitch system includes a first backstitch assembly and a second backstitch assembly. The first backstitch assembly and the second backstitch assembly are arranged on both sides of the triangle knitting assembly. A first backstitch path is formed in the first backstitch assembly, and a second backstitch path is formed in the second backstitch assembly. The first backstitch path and the second backstitch path are both located above the triangle knitting assembly. The first backstitch path and the second backstitch path are used to return the butts of the knitting needles to a consistent height. The present invention can ensure that when the triangle mechanism performs bidirectional knitting, the butts of the knitting needles before entering the triangle knitting assembly or after leaving the triangle knitting assembly are at the same height after backstitching, thereby ensuring the consistency of the knitted fabric coils and the knitting quality of the fabric.

Description

Technical Field

[0001] The present invention relates to the technical field of fabric knitting equipment, in particular to a backstitch system, a cam mechanism and a head assembly for a flat knitting machine. Background Art

[0002] The guide cam mechanism in conventional glove knitting machines on the market participates in three types of knitting: 1. Knitting from the elastic cam; 2. Knitting from the cast-on cam; and 3. Knitting in the reverse direction for sealing. There are essentially only two structures. The first type only has a forward cast-on function, with the reverse cast-on used only for sealing. During the forward cast-on process, the needle's stitch path follows this path: it first rises along the slope of the elastic cast-on cam to its highest point, then descends along the slope of the elastic density cam to its bottom, then rises along the slope of the forward cast-on cam to its highest point, then descends along the cam track to the position of the forward density cam, and then continues down the slope of the forward density cam to its bottom, completing a one-way knitting process where the elastic is first knitted in, followed by the yarn.

[0003] The second type of glove knitting machine features both forward and reverse casting. This type of machine is known in the industry as a jacquard glove machine or computerized flat knitting machine. If reverse casting is performed after forward casting in the same course, the needle's trajectory will be: it will pass through the bottom of the elastic density triangle before also passing through the bottom of the reverse density triangle. While this method allows for reverse casting, it inevitably increases the needle's downward movement when engaging the elastic thread, potentially leading to elastic breakage and uncontrollable ribbing size and tightness.

[0004] Therefore, the industry's knitting glove machines generally do not implement the reverse cast-on method when knitting ribs. Even if reverse cast-on is required, the following methods will be used:

[0005] 1. Do not knit the elastic thread in the same knitting row where the reverse cast-on is implemented (the industry term is called folding);

[0006] 2. If you need to knit the elastic yarn during the reverse cast-on process, to prevent the elastic yarn from breaking or affecting the knitting quality of the rib, you can only significantly raise the reverse density triangle so that the bottom of the reverse density triangle and the bottom of the elastic density triangle are at the same height. This will prevent the reverse density triangle from changing the downward range of the needles that have already engaged the elastic yarn. However, this will result in a very high knitting density value for the yarn in the knitting course, making it impossible to knit normally.

[0007] In summary, conventional glove knitting machines or flat knitting machines cannot properly perform both reverse cast-on and elastic knitting in the same knitting row of the rib portion, and therefore are not well suited for bidirectional synchronous knitting. To address this issue, Chinese invention patent application number 202210746452.9 discloses a needle guide cam mechanism suitable for bidirectional knitting of the rib portion of a glove. The cam mechanism comprises a mounting plate and a needle guide assembly mounted thereon. The needle guide assembly includes an elastic guide structure and a yarn guide structure. By improving the needle guide cam mechanism, the glove knitting machine can achieve simultaneous forward and reverse cast-on when knitting the rib portion of a glove, greatly improving the production capacity of the glove knitting machine.

[0008] However, the above patent only has a backstitch system on one side. During bidirectional knitting, it cannot be guaranteed that the butt of the knitting needle is at the same height as the butt of the knitting needle installed with the backstitch system on the other side before entering the knitting path or leaving the cam mechanism on the other side, thereby failing to ensure the consistency of the knitted fabric coils. Therefore, a backstitch system, a cam mechanism and a bidirectional knitting machine head are proposed to solve the above problem. Summary of the Invention

[0009] The present invention provides a backstitch system, a triangle mechanism and a machine head for bidirectional knitting. Backstitch components are provided on both sides of the triangle knitting component to ensure that during bidirectional knitting, the butts of the knitting needles before entering or leaving the triangle knitting component are at the same height after the backstitch, thereby ensuring the consistency of the loops of the woven fabric and the weaving quality of the fabric.

[0010] To achieve the above object, the present invention adopts the following technical solutions:

[0011] A backstitch system is installed on a triangular base plate, on which a triangular knitting assembly is installed, including a first backstitch assembly and a second backstitch assembly, wherein the first backstitch assembly and the second backstitch assembly are arranged on both sides of the triangular knitting assembly;

[0012] The first backstitch assembly forms a first backstitch path, and the second backstitch assembly forms a second backstitch path. Both the first backstitch path and the second backstitch path are located above the triangular knitting assembly and make the needle butts return to the same height.

[0013] Preferably, the first backstitch assembly includes a first backstitch cam and a first blocking cam;

[0014] The upper end of the first return needle triangle has a guide surface and a first return needle surface, the guide surface is inclined, the high end of the guide surface is connected to the first return needle surface, and the lower end of the first intercepting needle triangle has a first intercepting needle surface.

[0015] Preferably, the guide surface includes a first guide surface and a second guide surface, the first guide surface is arranged to be inclined upward, the second guide surface is arranged to be inclined downward, and the first guide surface, the first needle surface and the second guide surface are connected in sequence on the left and right.

[0016] Preferably, the lower end of the first guide surface or the second guide surface is further provided with a first guide needle surface that cooperates with the guide needle surface at the lower part of the density triangle.

[0017] Preferably, the lower end of the first needle blocking triangle also has a first guide surface and a second guide surface, the first guide surface is arranged obliquely downward, the second guide surface is arranged obliquely upward, and the first guide surface, the first needle blocking surface and the second guide surface are connected in sequence left and right.

[0018] Preferably, the inclination angle of the first guide surface is set to 30-60°, and the inclination angle of the second guide surface is set to 30-60°.

[0019] Preferably, the second backstitch assembly includes a second backstitch cam, and the upper end of the second backstitch cam has a first needle-lifting surface, a second backstitch surface, and a second needle-lifting surface;

[0020] The first needle lifting surface and the second needle lifting surface both have a high end and a bottom end, and the high end of the first needle lifting surface and the high end of the second needle lifting surface are respectively connected to two ends of the second needle return surface.

[0021] Preferably, the angle between the line connecting the high end and the low end of the first needle-lifting surface and the second needle-returning surface is in the range of 15-40°.

[0022] Preferably, the angle between the line connecting the high end and the low end of the second needle-lifting surface and the second needle-returning surface is in the range of 15-40°.

[0023] Preferably, the lower end of the first needle lifting surface or the second needle lifting surface is further provided with a second needle guide surface for use in conjunction with the needle guide surface at the lower part of the density triangle.

[0024] Preferably, it also includes a second needle blocking cam, the second needle blocking cam is arranged at the upper end of the second back needle cam, and the lower end of the second needle blocking cam is provided with a second needle blocking surface.

[0025] Preferably, a connecting thin plate is connected between the second needle blocking cam and the second return needle cam, and the connecting thin plate, the second return needle surface and the second needle blocking surface form a return needle path.

[0026] Preferably, the difference between the distance between the knitting needle butt and the needle jack butt and the distance between the lowest point of the second backstitch cam and the second backstitch surface is in the range of 0.5-3.5 mm.

[0027] A cam mechanism comprises a cam base plate, a pressure cam, a cam knitting assembly, an elastic cam and a backstitch system as described above. The pressure cam, the cam knitting assembly and the elastic cam are arranged in sequence. The lower part of the first backstitch assembly is arranged between the pressure cam and one side of the cam knitting assembly. The upper part of the first backstitch assembly is arranged above the pressure cam. The second backstitch assembly is arranged on the other side of the cam knitting assembly and is located above the elastic cam.

[0028] A triangle mechanism includes a triangle base plate, a pressure needle cam, a triangle weaving assembly, an elastic cam and the above-mentioned backstitch system. The above-mentioned triangle weaving assembly, the above-mentioned elastic cam and the above-mentioned pressure needle cam are arranged in sequence. The lower part of the above-mentioned second backstitch assembly is arranged between the above-mentioned pressure needle cam and one side of the above-mentioned triangle weaving assembly, and the lower part of the above-mentioned second backstitch assembly is located above the above-mentioned elastic cam. The above-mentioned first backstitch assembly is located on the other side of the above-mentioned triangle weaving assembly.

[0029] A machine head assembly for a flat knitting machine comprises a first needle guide machine head and a second needle guide machine head. The first needle guide machine head comprises the needle return system, and the second needle guide machine head also comprises the needle return system.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The first and second return needle assemblies are installed in the triangle mechanism, and the first and second return needle assemblies are respectively located on both sides of the triangle weaving assembly to ensure that when the triangle mechanism performs bidirectional weaving, the butt of the knitting needle passes through the return needle assembly before entering the triangle weaving assembly or after leaving the triangle weaving assembly, no matter from which side of the triangle weaving assembly the butt of the knitting needle enters the triangle weaving assembly or leaves the triangle weaving assembly, so that the butt of the knitting needle returns to a certain height, thereby ensuring the consistency of the knitted fabric loops and the weaving quality of the fabric; and the first return needle path and the second return needle path are both located above the triangle weaving assembly, and the first return needle assembly and the second return needle assembly that form the first return needle path and the second return needle path are not installed at the two side positions flush with the triangle weaving assembly, but are installed at the upper positions on both sides of the triangle weaving assembly, which not only utilizes the original longitudinal space of the triangle base plate, but also because there is no installation position for the return needle assembly on both sides of the triangle weaving assembly, the horizontal length of the triangle base plate is shortened to a certain extent, and the installation space of the components on the entire triangle base plate is more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 The overall schematic diagram of the triangular mechanism in the embodiment of the present invention Figure 1 The return needle path when moving to the right;

[0034] Figure 2 The overall schematic diagram of the triangular mechanism in the embodiment of the present invention Figure 1 The return needle path when moving to the left;

[0035] Figure 3 This is a schematic diagram of a first back needle assembly according to an embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of a second backstrap assembly according to an embodiment of the present invention;

[0037] Figure 5 The overall schematic diagram of the triangular mechanism in the embodiment of the present invention Figure 2 ;

[0038] Figure 6 The overall schematic diagram of the triangular mechanism in the embodiment of the present invention Figure 3 .

[0039] Description of reference numerals:

[0040] 1. Triangle base plate; 2. Pressing triangle; 3. Triangle knitting assembly; 4. First backstitch assembly; 41. First backstitch triangle; 411. First guide surface; 412. First backstitch surface; 413. Second guide surface; 414. First guide surface; 42. First blocking triangle; 421. First guide surface; 422. First blocking surface; 423. Second guide surface; 5. Second backstitch assembly; 51. Second backstitch triangle; 511. First lifting surface; 512. Second backstitch surface; 513. Second lifting surface; 514. Second guide surface; 52. Second blocking triangle; 521. Second blocking surface; 53. Connecting sheet; 6. Elastic triangle. DETAILED DESCRIPTION

[0041] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0044] like Figure 1-4 As shown, an embodiment of the present invention provides a backstitch system, which is installed on a triangle base plate 1 and includes a first backstitch assembly 4 and a second backstitch assembly 5, wherein the first backstitch assembly 4 and the second backstitch assembly 5 are respectively located on both sides of a triangle knitting assembly 3 installed on the triangle base plate 1, and the triangle knitting assembly 3 includes a left density triangle, a left needle-casting triangle, a middle triangle, a knitting needle triangle, a right needle-casting triangle and a right density triangle, wherein the middle triangle is also called the Zhongshan triangle, and forms a knitting path, and the needle butt of the needle jack can move relative to the triangle knitting assembly 3 and move along the knitting path to drive the knitting needle to knit, wherein the first backstitch assembly 4 and the second backstitch assembly 5 make the knitting The height at which the needle butts return is the same, and the height plane is B. Therefore, when the triangle mechanism performs bidirectional knitting, no matter which side of the triangle knitting assembly 3 the needle enters or leaves the knitting path, the butt of the needle will return to the same height, i.e., height plane B, under the action of the return needle assembly. For example, when the needle enters or leaves the knitting path from the first return needle assembly 4 side, the return height is B, and when the needle enters or leaves the knitting path from the second return needle assembly 5 side, the return height is also B, thereby ensuring that the needle has the same initial entry height when it enters the knitting path next time, thereby ensuring the consistency of the knitted fabric loops. The specific return needle route is as follows: Figure 1-2 As shown; there is no limitation on which side the first back needle assembly 4 and the second back needle assembly 5 are located in the triangle knitting assembly 3, and the specific triangle mechanism is set according to the specific situation.

[0045] Moreover, in order to make full use of the installation space of the triangular base plate 1 and make the triangles on the triangular base plate 1 more compact, during installation, the first backstitch path formed by the first backstitch assembly 4 and the second backstitch path formed by the second backstitch assembly 5 are both located above the triangular knitting assembly 3. Correspondingly, the knitting needles will return to their positions through the butts of the knitting needles instead of through the butts of the needle jacks. Then the first backstitch assembly 4 and the second backstitch assembly 5 will be installed at the upper positions on both sides of the triangular knitting assembly 3, instead of being installed at the same height on both sides of the triangular knitting assembly 3. Compared with the first backstitch assembly 4 and the second backstitch assembly 5 being installed at the same height on both sides of the triangular knitting assembly 3, the triangular knitting assembly 3 is avoided. The lateral installation space of the angle base plate 1 is further expanded, the lateral volume of the triangular base plate 1 will not increase, and the overall installation structure will be more compact, and the installation space of the triangular base plate 1 will be fully utilized; and because the knitting needle returns to its original position through the knitting needle butt, then compared with the first return needle assembly 4 and the second return needle assembly 5 being installed at the same height on both sides of the triangular weaving assembly 3 and returning to its original position using the needle butt of the needle jack, the service life of the entire knitting needle is longer, because the needle butt of the needle jack is originally used to cooperate with the weaving path in the triangular weaving assembly 3. If it is used for return again, in conjunction with the first return needle assembly 4 or the second return needle assembly 5, the wear of the needle butt of the needle jack is greatly increased.

[0046] Specifically, the first back needle assembly 4 includes a first back needle cam 41 and a first needle blocking cam 42, wherein the lower end of the first needle blocking cam 42 has a first needle blocking surface 422, and the upper end of the first back needle cam 41 has a guide surface and a first back needle surface 412, the guide surface is inclined, and the high end of the first guide surface 411 is connected to the first back needle surface 412, and the guide surface is used to guide the butt of the knitting needle so that it can move stably to the first back needle surface 412 through the guide surface, but after the butt of the knitting needle moves through the guide surface, it will continue to move along the guide surface, and the butt of the knitting needle will contact the first needle blocking surface 422, thereby preventing the butt of the knitting needle from continuing to move along the direction of the guide surface, so that the butt of the knitting needle reaches the first back needle surface 412 The first backstitch surface 412 of the first backstitch component 4 is arranged at a height of 1 / 4" and moves horizontally for a distance along the first backstitch surface 412, so that the knitting needles involved in the knitting can be stably at a consistent height after entering or leaving the knitting area, thereby ensuring the consistency of the loops of the knitted fabric; wherein the first backstitch surface 412 in the first backstitch component 4 is higher than the highest point of the triangular knitting component 3, that is, the first backstitch path is located above the triangular knitting component 3, no matter whether the first backstitch component 4 is located on the left or right side of the triangular knitting component 3, the actual setting position of its corresponding first backstitch triangle 41 will be in the space above the triangular base plate 1 on both sides of the triangular knitting component 3, and will not be directly located at the same height of the triangular knitting component 3, thereby reducing the lateral volume of the triangular base plate 1 to a certain extent.

[0047] Specifically, the guide surface includes a first guide surface 411 and a second guide surface 413. The first guide surface 411 is tilted upward, and the second guide surface 413 is tilted downward. The first guide surface 411, the return needle surface and the second guide surface 413 are connected in sequence from left to right. When in use, the butt of the knitting needle moves from left to right or from right to left relative to the first return needle triangle 41. Due to other factors, when the height of the butt of some knitting needles is lower than the height of the first return needle surface 412, its butt will pass through the first guide surface 411 or the second guide surface 413, and then pass through the obstruction of the first needle blocking surface 422, and finally move to the first return needle surface 412, and then move stably along the first return needle surface 412, so that the knitting needles entering or leaving the knitting area are uniform. At the same height, the consistency of the knitted fabric coils is ensured; specifically, the lower end of the first needle blocking triangle 42 also has a first guide surface 421 and a second guide surface 423. The first guide surface 421 is tilted downward, and the second guide surface 423 is tilted upward. The first guide surface 421, the needle blocking surface and the second guide surface 423 are connected in sequence from left to right. Whether the butt of the knitting needle moves from left to right or from right to left relative to the back stitch triangle, when the height of some knitting needle butts is higher than the height of the first back stitch surface 412 due to other factors, the butt of the knitting needle can still be pressed downward under the guidance of the first guide surface 421 and the second guide surface 423, so that the butt of the knitting needle can stably enter the first back stitch path, and finally contact with the back stitch surface and move along the back stitch surface. For example, Figure 1 As shown, when the first return needle assembly 4 is located on the left side of the triangle knitting assembly 3, when the needle butt moves from left to right relative to the triangle base plate 1, some needles will cause the needles to be strung up and down due to inertia, the tightness of the needle groove, and the tension of the yarn, so that the height of the needle butt will be lower than or higher than the first return needle surface 412, so that the needle butt will move to the first return needle surface 412 under the guidance of the first guide surface 421 or the first guide surface 411; when the needle butt moves from right to left relative to the triangle base plate 1, due to the adjustment of the left density triangle in the triangle knitting assembly 3, the height of the needle butt will be lower than or higher than the first return needle surface 412, and the needle butt will move to the first return needle surface 412 under the guidance of the second guide surface 423 or the second guide surface 413.

[0048] Preferably, the inclination angle of the first guide surface 421 is set to 30-60 degrees, and the inclination angle of the second guide surface 423 is set to 30-60 degrees. Figure 3As shown, the inclination angle of the first guide surface 421 is shown as A, and the inclination angle of the second guide surface 423 is shown as B. Because the angle is too small, the butt of the knitting needle is better protected, but the knitting stroke is too long. When the angle is too large, the knitting stroke is short, but when the triangular mechanism moves horizontally quickly, the downward pressure on the butt of the knitting needle is small, and the lateral force is large, which will cause needle punching and serious wear problems. Therefore, the above scheme can effectively protect the butt of the knitting needle, extend its service life and shorten the knitting stroke to a certain extent. In this embodiment, the inclination angle of the first guide surface 421 and the second guide surface 423 is set to 45°.

[0049] Specifically, the second backstitch component 5 includes a second backstitch triangle 51, and the upper end of the second backstitch triangle 51 has a first needle lifting surface 511, a second backstitch surface 512 and a second needle lifting surface 513; the first needle lifting surface 511 and the second needle lifting surface 513 both have a high end and a bottom end, and the first needle lifting surface 511, the second backstitch surface 512 and the second needle lifting surface 513 are arranged from left to right, and the high end of the first needle lifting surface 511 and the high end of the second needle lifting surface 513 are respectively connected to the two ends of the second backstitch surface 512, wherein the first backstitch surface 412 in the first backstitch component 4 is higher than the highest point of the triangle knitting component 3, that is, the second backstitch path is located above the triangle knitting component 3, regardless of whether the first backstitch component 4 is located on the left side of the triangle knitting component 3 Still on the right side, the actual setting position of its corresponding first backstitch triangle 41 will be in the space above the triangle base plate 1 on both sides of the triangle knitting component 3, and will not be installed at the same height of the triangle knitting component 3, thereby reducing the lateral volume of the triangle base plate 1 to a certain extent; and due to other factors, the butts of some knitting needles are located lower than the second backstitch surface 512 before entering the knitting area or after exiting the knitting area. When moving, the butts of the knitting needles on the side of the second backstitch component 5 will move along the first needle lifting surface 511 or the second needle lifting surface 513, and finally move to the second backstitch surface 512, so that the knitting needles can stably return to a consistent height before entering the knitting area or after exiting the knitting area; for example, Figure 1 As shown, when the butt of the knitting needle moves from right to left relative to the triangular base plate 1, some knitting needles will cause the needles to be strung up and down due to inertia, the tightness of the needle groove, and the strength of the yarn tension, so that the height of the butt of the knitting needle will be lower than the first return needle surface 412, and the butt of the knitting needle will move to the second return needle surface 512 under the guidance of the second needle lifting surface 513; when the butt of the knitting needle moves from left to right relative to the triangular base plate 1, due to the adjustment of the right density triangle in the triangular knitting component 3, the height of the butt of the knitting needle will be lower than the second return needle surface 512, and the butt of the knitting needle will move to the second return needle surface 512 under the guidance of the first needle lifting surface 511.

[0050] Preferably, if Figure 4As shown, the angle between the line between the high end and the low end of the first needle lifting surface 511 and the second return needle surface 512 is E, and the value range is 15-40 degrees. The angle between the line between the high end and the low end of the second needle lifting surface 513 and the second return needle surface 512 is F, and the value range is 15-40 degrees. Within this angle range, the slopes of the first needle lifting surface 511 and the second needle lifting surface 513 will be relatively gentle, so as to avoid the needle butt of the knitting needle from having too much inertia after the first needle lifting surface 511 or the second needle lifting surface 513 has finished moving. The situation that a large amount of skipped stitches occurs, accordingly, the first needle lifting surface 511 can be an inclined surface or an arc surface. In this embodiment, the angle between the line between the high end and the low end of the first needle lifting surface 511 and the second needle return surface 512 is 20 degrees, and the angle between the line between the high end and the low end of the second needle lifting surface 513 and the second needle return surface 512 is 20 degrees. The first needle lifting surface 511 is an arc surface, and the central angle range of the first needle lifting surface 511 and the second needle lifting surface 513 is 20-30 degrees. Figure 4 In the figure, the central angle of the first needle lifting surface 511 is shown as C, and the central angle of the second needle lifting surface 513 is shown as D. The radius setting range is 25-30 mm. Within this range, the first needle lifting surface 511 and the second needle lifting surface 513 are more stable.

[0051] Preferably, during operation, the butt of the knitting needle moves on the second return needle surface 512, and the butt of the needle jack moves on the lower end surface of the second return needle surface 512. The distance between the butt of the knitting needle and the butt of the needle jack is the same as the distance between the lowest point of the second return needle triangle 51 and the second return needle surface 512, and the difference is in the range of 1-1.5mm. This can avoid the situation where the amplitude of the upper and lower stitches of the knitting needle is too large during operation, and at the same time, it also leaves a margin to make the knitting needle run stably. In this embodiment, the distance between the butt of the knitting needle and the butt of the needle jack is 22mm. Accordingly, the distance between the lowest point of the second return needle triangle 51 and the second return needle surface 512 can be set in the range of 20.5-21mm.

[0052] Preferably, the lower end of the first guide surface 411 or the second guide surface 413 is also provided with a first guide surface 414 that cooperates with the guide surface of the lower part of the density triangle. When the density triangle drops to the extreme position, the butt of the knitting needle will move to the first guide surface 414 and then cooperate with the guide surface of the lower part of the density triangle, so that there is a sufficiently long guide path to enable the coil to form a loop, and then it is directly lifted through the first guide surface 411 or the second guide surface 413, moves to the first return needle surface 412, and returns to a certain height. Furthermore, the first guide surface 414 is set on the first return needle triangle 41, which can further reduce the volume of the density triangle and further reduce the space occupied by the sliding of the density triangle. Preferably, the lower end of the first needle lifting surface 511 or the second lifting surface is provided with a second guide needle surface 514 used in conjunction with the guide needle surface at the bottom of the density triangle. When the density triangle drops to the extreme position, the butt of the knitting needle will move to the second guide needle surface 514, and then cooperate with the guide needle surface at the bottom of the density triangle, so that there is a sufficiently long guide needle path to enable the coil to be formed into a loop, and then it is directly lifted through the first needle lifting surface 511 or the second lifting surface, moved to the second return needle surface 512, and returned to a certain height. Furthermore, the second guide needle surface 514 is set on the second return needle triangle 51, which can further reduce the volume of the density triangle and further reduce the space occupied by the sliding of the density triangle. Moreover, the lower end of the first needle lifting surface 511 or the second lifting surface is provided with a convex portion, and the second guide needle surface 514 is the upper end surface of the convex portion. Specifically, in this embodiment, the first back needle assembly 4 is located on the left side of the triangular weaving assembly 3, and the second back needle assembly 5 is located on the right side of the triangular weaving assembly 3, so that the first guide needle surface 414 is located at the lower end of the second guide surface 413, the protrusion is located at the lower end of the first lifting surface, and the second guide needle surface 514 is located on the upper end surface of the protrusion.

[0053] Another embodiment of the present invention further provides a triangular mechanism, wherein the triangular mechanism includes two structures, as shown below:

[0054] Among them, Figure 1As shown, the first triangle mechanism includes a triangle base plate 1, a needle pressing triangle 2, a triangle weaving assembly 3, an elastic triangle 6 and a back needle system provided in the above embodiment. The triangle weaving assembly 3 has a weaving path, which can allow the knitting needles to move in both directions for bidirectional weaving. As shown in the figure, the needle pressing triangle 2, the triangle weaving assembly 3 and the elastic triangle 6 are arranged in sequence from left to right, and the back needle system includes a first back needle assembly 4 and a second back needle assembly 5. The lower part of the first back needle assembly 4 is arranged between the needle pressing triangle 2 and the left side of the triangle weaving assembly 3, and the upper part of the first back needle assembly 4 is arranged above the needle pressing triangle 2, that is, the first back needle triangle 41 is located between the needle pressing triangle 2 and the left side of the triangle weaving assembly 3, and the first needle blocking triangle 42 is located above the needle pressing triangle 2; correspondingly, the second back needle assembly 5 is installed on the right side of the triangle weaving assembly 3 and above the elastic triangle 6, that is, the second back needle triangle 51 is located on the right side of the triangle weaving assembly 3 and above the elastic triangle 6, and the lower end face of the second back needle triangle 51 forms a weaving path with the elastic triangle 6 for rubber weaving.

[0055] Specifically, in this embodiment, in the first triangular mechanism, the first needle lifting surface 511 and the second needle lifting surface 513 are both arc surfaces, wherein the central angle range of the first needle lifting surface 511 and the second needle lifting surface 513 is 20-30°, the radius setting range is 25-30mm, the length of the return needle surface is set to 7.5mm, and the total width of the second return needle triangle 51 is set to 20.5-20.8mm, so that the first needle lifting surface 511 and the second needle lifting surface 513 are relatively stable, and the butt of the knitting needle has a small inertia after the movement of the first needle lifting surface 511 or the second needle lifting surface 513, and the needle butt of the knitting needle has a small upward jump amplitude, and can quickly fall on the second return needle surface 512 and move along the second return needle surface 512.

[0056] Specifically, the first cam mechanism also includes a second needle blocking cam 52, the second needle blocking cam 52 is arranged at the upper end of the second back needle cam 51, the second needle blocking cam 52 and the second back needle cam 51 together constitute a second back needle assembly 5, and the lower end of the second needle blocking cam 52 is provided with a second needle blocking surface 521. The existence of the second needle blocking surface 521 can well prevent the butts of some knitting needles from continuing to move due to inertia after passing through the first needle lifting surface 511 and the second needle lifting surface 513, resulting in a large needle skipping amplitude, thereby ensuring that the butts of the knitting needles move stably on the back needle surface and return to a certain height stably.

[0057] In the first triangular mechanism structure, Figure 5As shown, in order to further reduce the installation space of the second needle blocking triangle 52 on the triangle base plate 1, that is, to reduce the installation threaded holes, a connecting thin plate 53 is connected between the second needle blocking triangle 52 and the second return needle triangle 51, and the connecting thin plate 53, the second return needle surface 512 and the second needle blocking surface 521 form a second return needle path, so that the second needle blocking triangle 52 and the second return needle triangle 51 form a whole, that is, there is no need to set the installation hole of the second needle blocking triangle 52 on the triangle base plate 1, which is more convenient to use.

[0058] Among them, Figure 6 As shown, the second triangle mechanism includes a triangle base plate 1, a needle pressing triangle 2, a triangle weaving assembly 3, an elastic triangle 6 and the back stitch system in the above embodiment. The triangle weaving assembly 3 has a weaving path, which can allow the knitting needles to move in both directions and perform bidirectional weaving. As shown in the figure, the triangle weaving assembly 3, the elastic triangle 6 and the needle pressing triangle 2 are arranged in sequence from left to right. The lower part of the second back stitch assembly 5 is arranged between the needle pressing triangle 2 and the right side of the triangle weaving assembly 3, and the lower part of the second back stitch assembly 5 is located above the elastic triangle 6, that is, the second back stitch triangle 51 is arranged between the needle pressing triangle 2 and the right side of the triangle weaving assembly 3, and is located above the elastic triangle 6. The first back stitch assembly 4 is located on the left side of the triangle weaving assembly 3, that is, the first back stitch triangle 41 and the first needle blocking triangle 42 are located on the left side of the triangle weaving assembly 3.

[0059] In order to minimize the horizontal installation space of the triangle base plate 1 as much as possible, the second needle lifting surface 513 of the second return needle triangle 51 is steeper than the second needle lifting surface 513 in the first triangle mechanism, but the parameter setting of the first needle lifting surface 511 is the same as the first needle lifting surface 511 in the first triangle mechanism, and the horizontal width is lower. However, in order to reduce the inertia of the needle butt after the movement on the second needle lifting surface 513, a second needle blocking triangle 52 is also provided on the second return needle triangle 51. At this time, due to the presence of the needle pressing triangle 2, the second needle blocking triangle 52 has an installation position on the triangle base plate 1, and is installed above the needle pressing triangle 2.

[0060] In another embodiment of the present invention, a bidirectional weaving machine head is provided, including a first needle guide machine head and a second needle guide machine head, the first needle guide machine head is used to weave the front side of the fabric, and the second needle guide machine head is used to weave the back side of the fabric; the first needle guide machine head includes the return needle system of the above-mentioned embodiment, that is, the first needle guide mechanism has a first return needle component 4 and a second return needle component 5, the first return needle component 4 and the second return needle component 5 are respectively arranged on both sides of the inner triangular weaving component 3, and can perform bidirectional return needle, the second needle guide machine head also includes the return needle system of the above-mentioned embodiment, that is, the second needle guide mechanism also has a first return needle component 4 and a second return needle component 5, the first return needle component 4 and the second return needle component 5 are respectively arranged on both sides of the inner triangular weaving component 3, and can perform bidirectional return needle, thereby ensuring the consistency of the coils in the fabric weaved by the first needle guide machine head and the second needle guide machine head, and ensuring the weaving quality of the fabric.

[0061] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A backstitch system, mounted on a triangular base plate, on which a triangular knitting assembly is mounted, characterized in that: It includes a first backstitch assembly and a second backstitch assembly, wherein the first backstitch assembly and the second backstitch assembly are arranged on both sides of the triangular knitting assembly; The first backstitch assembly forms a first backstitch path, and the second backstitch assembly forms a second backstitch path. The first backstitch path and the second backstitch path are both located above the triangular knitting assembly and enable the needle butts to return to the same height. The first backstitch assembly includes a first backstitch cam and a first blocking cam; The upper end of the first needle-returning cam has a guide surface and a first needle-returning surface, the guide surface is inclined, the high end of the guide surface is connected to the first needle-returning surface, and the lower end of the first needle-returning cam has a first needle-returning surface; The guide surface includes a first guide surface and a second guide surface, the first guide surface is arranged to be inclined upward, the second guide surface is arranged to be inclined downward, and the first guide surface, the first needle-returning surface and the second guide surface are connected in sequence on the left and right sides; The lower end of the second guide surface is further provided with a first guide needle surface that cooperates with the guide needle surface at the lower part of the density triangle, and the first guide needle surface and the second guide surface are not on the same plane; The lower end of the first needle blocking cam further comprises a first guide surface and a second guide surface, the first guide surface being arranged obliquely downward, the second guide surface being arranged obliquely upward, and the first guide surface, the first needle blocking surface and the second guide surface being sequentially connected left to right; The second backstitch assembly includes a second backstitch triangle, and the upper end of the second backstitch triangle has a first needle lifting surface, a second backstitch surface, and a second needle lifting surface; The first needle lifting surface and the second needle lifting surface both have a high end and a low end, and the high end of the first needle lifting surface and the high end of the second needle lifting surface are respectively connected to two ends of the second needle return surface; The lower end of the first needle lifting surface is further provided with a second needle guide surface used in conjunction with the needle guide surface at the lower part of the density triangle, and the second needle guide surface and the first needle lifting surface are not on the same plane. 2 . The needle return system according to claim 1 , wherein the inclination angle of the first guide surface is set to 30-60°, and the inclination angle of the second guide surface is set to 30-60°.

3. The needle return system according to claim 1, characterized in that: The angle between the line connecting the upper end and the lower end of the first needle-lifting surface and the second needle-returning surface is in the range of 15-40°.

4. The needle-returning system according to claim 1, characterized in that: The angle between the line connecting the upper end and the lower end of the second needle-lifting surface and the second needle-returning surface is in the range of 15-40°.

5. The needle-returning system according to claim 1, characterized in that: It also includes a second needle blocking cam, which is arranged at the upper end of the second back needle cam, and the lower end of the second needle blocking cam is provided with a second needle blocking surface.

6. The needle-returning system according to claim 5, characterized in that: A connecting thin plate is connected between the second needle blocking cam and the second return needle cam, and the connecting thin plate, the second return needle surface and the second needle blocking surface form a return needle path.

7. The needle-returning system according to claim 1, characterized in that: The difference between the distance between the knitting needle butt and the needle jack butt and the distance between the lowest point of the second backstitch cam and the second backstitch surface is in the range of 0.5-3.5 mm.

8. A triangular mechanism, characterized in that: It includes a triangular base plate, a pressure needle triangle, a triangular weaving assembly, an elastic triangle and a backstitch system according to any one of claims 1 to 7, wherein the pressure needle triangle, the triangular weaving assembly and the elastic triangle are arranged in sequence, the lower part of the first backstitch assembly is arranged between the pressure needle triangle and one side of the triangular weaving assembly, the upper part of the first backstitch assembly is arranged above the pressure needle triangle, and the second backstitch assembly is arranged on the other side of the triangular weaving assembly and is located above the elastic triangle.

9. A triangular mechanism, characterized in that: It includes a triangular base plate, a pressure needle triangle, a triangular knitting assembly, an elastic triangle and a backstitch system according to any one of claims 1 to 7, wherein the triangular knitting assembly, the elastic triangle and the pressure needle triangle are arranged in sequence, the lower part of the second backstitch assembly is arranged between the pressure needle triangle and one side of the triangular knitting assembly, and the lower part of the second backstitch assembly is located above the elastic triangle, and the first backstitch assembly is located on the other side of the triangular knitting assembly.

10. A head assembly for a flat knitting machine, characterized in that: It comprises a first needle guide handpiece and a second needle guide handpiece, wherein the first needle guide handpiece comprises the needle return system as described in any one of claims 1-7, and the second needle guide handpiece also comprises the needle return system as described in any one of claims 1-7.

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