CN220788970U - Needle return system, cam mechanism and head assembly for flat knitting machine - Google Patents

Abstract

The utility model relates to a needle return system, a cam mechanism and a head assembly for a flat knitting machine, wherein the needle return system is arranged on a cam base plate, the cam base plate is provided with a cam knitting assembly, the needle return system comprises a first needle return assembly and a second needle return assembly, and the first needle return assembly and the second needle return assembly are arranged on two sides of the cam knitting assembly; the first back needle assembly is internally provided with a first back needle path, the second back needle assembly is internally provided with a second back needle path, the first back needle path and the second back needle path are both positioned above the triangular knitting assembly, and the first back needle path and the second back needle path are used for enabling the knitting needle butt to return to a consistent height. The utility model can ensure that the butts of the knitting needles before entering the triangular knitting assembly or after leaving the triangular knitting assembly are at the same height after needle return when the triangular mechanism carries out bidirectional knitting, ensure the consistency of knitting loops and ensure the knitting quality of fabrics.

Description

Needle return system, cam mechanism and head assembly for flat knitting machine

Technical Field

The utility model relates to the technical field of fabric knitting equipment, in particular to a needle return system, a cam mechanism and a head assembly for a flat knitting machine.

Background

The participation of the guide pin triangle mechanism in the conventional glove knitting machine on the market in knitting is divided into three types: 1. knitting from the rubber triangle; 2. knitting from a needle lifting cam; 3. the reverse direction is used for sealing and braiding, the structure is basically only two, and the first is that: only has the function of forward needle lifting, and the reverse needle lifting is only used for sealing. In the forward needle lifting process, the moving track of the needle stitch is as follows: firstly, rising along the inclined plane of the rubber band needle raising triangle until reaching the highest point, then descending along the inclined plane of the rubber band density triangle until reaching the bottom of the rubber band needle raising triangle, then rising along the inclined plane of the forward needle raising triangle until reaching the highest point, then descending along the triangle track, continuing descending along the inclined plane of the forward density triangle until reaching the bottom of the rubber band needle raising triangle after descending to the position of the forward density triangle, and finally finishing one-way knitting of knitting the rubber band and then knitting the yarn.

Second kind: meanwhile, the knitting glove machine has the functions of forward needle lifting and reverse needle lifting, and is called a jacquard glove machine or a computerized flat knitting machine in the industry. If the reverse lifting is performed after the forward lifting in the same knitting course, the moving track of the needle stitch is: after passing through the bottom of the elastic density triangle, the motion is performed through the bottom of the reverse density triangle. Although the reverse needle lifting can be realized in the working mode, the descending amplitude of the knitting needle for feeding the elastic threads is increased, and then the elastic threads are broken or the size and the tightness of the rib parts of the glove are uncontrollable.

Therefore, the knitting glove machine in industry generally does not implement the reverse needle lifting working mode when knitting rib parts, and even if the reverse needle lifting is needed, the following modes are adopted:

1. knitting of the elastic thread is not performed in the same knitting course in which the reverse lift is performed (industry term is called tuck);

2. if the knitting of the elastic thread is required to be considered in the reverse knitting process, in order to prevent the elastic thread from breaking or affecting the knitting quality of the rib part, the reverse density cam can only be greatly adjusted to ensure that the bottom of the reverse density cam and the bottom of the elastic thread cam reach the same height, so that the descending amplitude of the knitting needle with the elastic thread can not be changed by the reverse density cam. However, this causes a high knitting degree value of the yarn in the course, and normal knitting cannot be achieved.

In summary, in the conventional glove knitting machine or flat knitting machine, the reverse stitch knitting and the knitting of the elastic cord are not performed in the same knitting course of the knitted rib portion, so that the conventional glove knitting machine or flat knitting machine cannot be well applied to the processing mode of the bidirectional synchronous knitting. Aiming at the problem, the Chinese patent application number 202210746452.9 discloses a guide pin triangular mechanism suitable for bidirectional knitting of a glove rib part, which comprises a mounting plate and a guide pin assembly arranged on the mounting plate, wherein the guide pin assembly comprises an elastic guide pin structure, a yarn guide pin structure and the like, and when the rib part of the glove is knitted by a knitting glove machine, the guide pin triangular mechanism is improved, so that the forward needle lifting and the reverse needle lifting can be realized at the same time, and the productivity of the knitting glove machine is greatly improved.

However, in the above patent, only one side is provided with a needle return system, and during bidirectional knitting, it is not guaranteed that the butt of the knitting needle is at the same height as the butt of the knitting needle on the other side, on which the needle return system is mounted, before the other side enters the knitting path or after the other side leaves the cam mechanism, and thus the consistency of the knitted fabric loops can not be guaranteed.

Disclosure of Invention

The utility model provides a needle return system, a cam mechanism and a machine head for bidirectional knitting, wherein both sides of a cam knitting assembly are provided with the needle return assemblies, so that the knitting butt of a knitting needle before entering the cam knitting assembly or after leaving the cam knitting assembly is at the same height after needle return during bidirectional knitting, thereby ensuring the consistency of knitting loops and the knitting quality of fabrics.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the needle return system is arranged on a triangular bottom plate, a triangular weaving assembly is arranged on the triangular bottom plate, the triangular weaving assembly comprises a first needle return assembly and a second needle return assembly, and the first needle return assembly and the second needle return assembly are arranged on two sides of the triangular weaving assembly;

the first needle return assembly is provided with a first needle return path, the second needle return assembly is provided with a second needle return path, and the first needle return path and the second needle return path are both positioned above the triangular knitting assembly and enable the return heights of the knitting butts to be the same.

Preferably, the first needle return assembly comprises a first needle return cam and a first needle blocking cam;

the upper end of the first needle return triangle is provided with a guide surface and a first needle return surface, the guide surface is obliquely arranged, the high end of the guide surface is connected with the first needle return surface, and the lower end of the first needle blocking triangle is provided with a first needle blocking surface.

Preferably, the guide surface includes a first guide surface and a second guide surface, the first guide surface is disposed obliquely upward, the second guide surface is disposed obliquely downward, and the first guide surface, the needle return surface, and the second guide surface are sequentially connected left and right.

Preferably, the lower end of the first guide surface or the second guide surface is further provided with a first guide pin surface matched with the guide pin surface at the lower part of the density triangle.

Preferably, the first needle blocking triangle further has a first guide surface and a second guide surface at a lower end thereof, the first guide surface is inclined downward, the second guide surface is inclined upward, and the first guide surface, the needle blocking surface, and the second guide surface are connected in this order.

Preferably, the first guide surface is inclined at an angle of 30 to 60 ° and the second guide surface is inclined at an angle of 30 to 60 °.

Preferably, the second needle return assembly comprises a second needle return triangle, and the upper end of the second needle return triangle is provided with a first needle lifting surface, a second needle return surface and a second needle lifting surface;

the first needle lifting surface and the second needle lifting surface are respectively provided with 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 with the two ends of the second needle returning surface.

Preferably, an included angle between a connecting line between the high end and the low end of the first needle lifting surface and the second needle returning surface is 15-40 degrees.

Preferably, an included angle between a connecting line between the high end and the low end of the second needle lifting surface and the second needle returning surface is 15-40 degrees.

Preferably, the lower end of the first needle lifting surface or the second needle lifting surface is further provided with a second needle guiding surface matched with the needle guiding surface at the lower part of the density triangle.

Preferably, the needle blocking device further comprises a second needle blocking triangle, wherein the second needle blocking triangle is arranged at the upper end of the second needle returning triangle, and a second needle blocking surface is arranged at the lower end of the second needle blocking triangle.

Preferably, a connection sheet is connected between the second needle blocking cam and the second needle return cam, and the connection sheet, the second needle return surface, and the second needle blocking surface form a needle return path.

Preferably, the distance between the butt of the knitting needle and the butt of the jack and the distance between the lowest part of the second needle return cam and the needle return face are in the range of 0.5 to 3.5mm.

The utility model provides a triangle mechanism, includes triangle bottom plate, presses needle triangle, triangle braiding subassembly, rubber band triangle and above-mentioned back needle system, and above-mentioned pressure needle triangle, above-mentioned triangle braiding subassembly and above-mentioned rubber band triangle set gradually, and above-mentioned first back needle subassembly lower part is located between above-mentioned pressure needle triangle and the above-mentioned triangle braiding subassembly one side, and above-mentioned pressure needle triangle top is located on above-mentioned first back needle subassembly upper portion, and above-mentioned second back needle subassembly is located above-mentioned triangle braiding subassembly opposite side, and is located above-mentioned rubber band triangle top.

The utility model provides a triangle mechanism, includes triangle bottom plate, presses needle triangle, triangle braiding subassembly, rubber band triangle and above-mentioned back needle system, and above-mentioned triangle is woven subassembly, above-mentioned rubber band triangle and above-mentioned pressure needle triangle and is set gradually, and above-mentioned second back needle subassembly lower part is located between above-mentioned pressure needle triangle and the above-mentioned triangle is woven subassembly one side, and above-mentioned second back needle subassembly lower part is located above rubber band triangle, and above-mentioned first back needle subassembly is located above-mentioned triangle and is woven subassembly opposite side.

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

Compared with the prior art, the utility model has the beneficial effects that:

the first needle return component and the second needle return component are arranged in the cam mechanism, and are respectively positioned at two sides of the cam knitting component, so that when the cam mechanism carries out bidirectional knitting, the butt of the knitting needle passes through the needle return component no matter which side of the cam knitting component enters the cam knitting component or leaves the cam knitting component before entering the cam knitting component or after leaving the cam knitting component, and the butt of the knitting needle returns to a certain height, thereby ensuring the consistency of knitting fabric loops and the knitting quality of fabrics; the first return needle path and the second return needle path are both positioned above the triangular weaving assembly, and the first return needle assembly and the second return needle assembly forming the first return needle path and the second return needle path are not installed at the two side positions which are flush with the triangular weaving assembly, but are installed at the upper positions of the two sides of the triangular weaving assembly, so that the original space of the triangular bottom plate which is longitudinally vacant is utilized, and the installation positions of the return needle assemblies are not arranged at the two sides of the triangular weaving assembly, so that the transverse length of the triangular bottom plate is shortened to a certain extent, and the installation space of the components on the whole triangular bottom plate is more compact.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a cam mechanism according to an embodiment of the present utility model, illustrating a return line when the cam mechanism moves to the right;

FIG. 2 is a schematic diagram of a cam mechanism according to an embodiment of the present utility model, illustrating a return line when the cam mechanism moves leftwards;

FIG. 3 is a schematic view of a first return needle assembly according to an embodiment of the present utility model;

FIG. 4 is a schematic view of a second return needle assembly according to an embodiment of the present utility model;

FIG. 5 is a second schematic diagram of the triangle mechanism according to the embodiment of the present utility model;

fig. 6 is a schematic diagram of a triangle mechanism according to an embodiment of the present utility model.

Reference numerals illustrate:

1. a triangular bottom plate; 2. needle pressing triangle; 3. a triangle braiding assembly; 4. a first return needle assembly; 41. a first return needle cam; 411. a first guide surface; 412. a first needle return surface; 413. a second guide surface; 42. a first needle blocking triangle; 421. a first guide surface; 422. a first needle blocking surface; 423. a second guide surface; 424. a first guide pin surface; 5. a second return needle assembly; 51. a second return needle triangle; 511. a first needle lifting surface; 512. a second needle return surface; 513. a second needle lifting surface; 514. a second guide pin surface; 52. a second needle blocking triangle; 521. a second needle blocking surface; 53. connecting the thin plates; 6. rubber triangle.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1-4, the embodiment of the present utility model provides a needle return system, which is installed on a triangle base plate 1, and includes a first needle return component 4 and a second needle return component 5, where the first needle return component 4 and the second needle return component 5 are respectively located at two sides of a triangle knitting component 3 installed on the triangle base plate 1, the triangle knitting component 3 includes a left density triangle, a left needle start triangle, a middle triangle, a knitting needle triangle, a right needle start triangle and a right density triangle, where the middle triangle is also called a middle mountain triangle, and forms a knitting path, a butt of a jack can move relative to the triangle knitting component 3 and move along the knitting path to drive a knitting needle to perform knitting, where the first needle return component 4 and the second needle return component 5 make the height of the butt return be the same, and the height surface is B, so that when the knitting needle enters the knitting path from which side of the triangle knitting component 3 or leaves the knitting path, the knitting needle returns to the same height B under the action of the needle return component, for example, when the needle returns from the first needle return component 4 or leaves the knitting path to the first needle return path, the specific needle return path is guaranteed to enter the knitting path, and the knitting needle is the knitting needle return path is the same as the knitting needle 1 when the needle return path is shown in the first needle return path, and the needle return path is the needle loop is the 1; the specific first looper assembly 4 and the second looper assembly 5 are located on which side of the cam knitting assembly 3, not limited, and are specifically set in the specific cam mechanism according to specific situations.

In order to fully utilize the installation space of the cam base plate 1 and enable the cams on the cam base plate 1 to be more compact, during installation, a first needle return path formed by the first needle return assembly 4 and a second needle return path formed by the second needle return assembly 5 are positioned above the cam knitting assembly 3, corresponding knitting needles return through butt of the knitting needles instead of through butt of a needle jack, the first needle return assembly 4 and the second needle return assembly 5 are installed at the upper positions of the two sides of the cam knitting assembly 3 and cannot be installed at the positions of the two sides of the cam knitting assembly 3 with the same height, compared with the positions of the two sides of the cam knitting assembly 3, the transverse installation space of the cam base plate 1 is prevented from being further enlarged, the transverse volume of the cam base plate 1 is prevented from being increased, the whole installation structure is more compact, and the installation space of the cam base plate 1 is fully utilized; moreover, because the knitting needle returns through the knitting butt, the service life of the whole knitting needle is longer compared with the scheme that the first needle return assembly 4 and the second needle return assembly 5 are arranged at the same height at two sides of the triangular knitting assembly 3 and the needle jack butt is utilized for returning, because the needle jack butt is used for being matched with a knitting path in the triangular knitting assembly 3, if the needle jack butt is used for returning again and is matched with the first needle return assembly 4 or the second needle return assembly 5, the abrasion of the needle jack butt is greatly increased.

Specifically, the first needle return assembly 4 includes a first needle return cam 41 and a first needle blocking cam 42, where a first needle blocking face 422 is provided at a lower end of the first needle blocking cam 42, a guide face and a first needle return face 412 are provided at an upper end of the first needle return cam 41, the guide face is obliquely disposed, a high end of the first guide face 411 is connected with the first needle return face 412, the guide face is used for guiding the butt of the knitting needle, so that the butt of the knitting needle can stably move to the first needle return face 412 through the guide face, but after moving through the guide face, the butt of the knitting needle continuously moves along the guide face, and the butt of the knitting needle can contact with the first needle blocking face 422, thereby preventing the butt of the knitting needle from continuously moving along the direction of the guide face, enabling the butt of the knitting needle to reach the height where the first needle return face 412 is located, and horizontally move along the first needle return face 412 for a distance, so that the knitting needle can stably and consistently move to a consistent height after entering or leaving a knitting area, and the consistency of knitting loops is ensured; the first return surface 412 in the first return needle assembly 4 is higher than the highest point of the triangular knitting assembly 3, that is, the first return needle path is located above the triangular knitting assembly 3, whether the first return needle assembly 4 is located at the left side or the right side of the triangular knitting assembly 3, the actual setting position of the corresponding first return needle triangle 41 will be in the space above the triangular base plate 1 at two sides of the triangular knitting assembly 3, and will not be directly located at the position of the height of the triangular knitting assembly 3, so that the transverse volume of the triangular base plate 1 can be reduced to a certain extent.

Specifically, the guiding surfaces include a first guiding surface 411 and a second guiding surface 413, the first guiding surface 411 is obliquely arranged upwards, the second guiding surface 413 is obliquely arranged downwards, the first guiding surface 411, the needle return surface and the second guiding surface 413 are sequentially connected 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 needle return cam 41, when the height of the butt of part of the knitting needle is lower than that of the first needle return surface 412 due to other factors, the butt of the knitting needle moves through the first guiding surface 411 or the second guiding surface 413, then passes through the blocking of the first needle blocking surface 422, finally moves to the first needle return surface 412, then moves stably along the first needle return surface 412, so that the knitting needles entering or leaving a knitting area are all located at the same height, and consistency of knitting loops of the knitting fabric is ensured; specifically, the lower end of the first needle blocking cam 42 further has a first guiding surface 421 and a second guiding surface 423, the first guiding surface 421 is disposed obliquely downward, the second guiding surface 423 is disposed obliquely upward, the first guiding surface 421, the needle blocking surface and the second guiding surface 423 are sequentially connected from left to right, the butt of the knitting needle moves from left to right or from right to left relative to the needle return cam, and when the height of the butt of a part of the knitting needle is higher than the height of the first needle return surface 412 due to other factors, the butt of the knitting needle can still be pressed downward under the guidance of the first guiding surface 421 and the second guiding surface 423, so that the butt of the knitting needle can stably enter the first needle return path, finally contact with the needle return surface and move along the needle return surface. For example, as shown in fig. 1, when the first needle return assembly 4 is located at the left side of the cam knitting assembly 3, when the butt of the knitting needle moves from left to right relative to the cam base plate 1, part of the knitting needle can cause up-down needle-stringing due to inertia, tightness of the needle groove and tension of the yarn, so that the height of the butt of the knitting needle can be lower than or higher than the first needle return surface 412, and the butt of the knitting needle can move to the first needle return surface 412 under the guidance of the first guide surface 421 or the first guide surface 411; when the butt moves from right to left with respect to the cam base plate 1, the height of the butt is lower or higher than the first return surface 412 due to the adjustment of the left density cam in the cam knitting unit 3, and the butt moves to the first return surface 412 under the guide of the second guide surface 423 or the second guide surface 413.

Preferably, the inclination angle of the first guide surface 421 is set to 30-60 °, the inclination angle of the second guide surface 423 is set to 30-60 °, as shown in fig. 3, the inclination angle of the first guide surface 421 is shown as a, the inclination angle of the second guide surface is shown as B, because the angle is too small, the protection of the butt of the knitting needle is good, but the knitting stroke is too long, when the angle is too large, the knitting stroke is short, but when the cam mechanism moves rapidly, the butt pressing force to the knitting needle is small, the lateral force is large, the problem of serious striking and abrasion is caused, so the butt of the knitting needle can be strongly protected, the service life of the knitting needle can be prolonged, and the knitting stroke can be shortened to some extent, in this embodiment, the inclination angles of the first guide surface 421 and the second guide surface 423 are set to 45 °.

Specifically, the second needle return assembly 5 includes a second needle return cam 51, and a first needle lifting surface 511, a second needle return surface 512 and a second needle lifting surface 513 are provided at the upper end of the second needle return cam 51; the first needle lifting surface 511 and the second needle lifting surface 513 are respectively provided with a high end and a bottom end, the first needle lifting surface 511, the second needle returning surface 512 and the second needle lifting surface 513 are arranged from left to right, the high end of the first needle lifting surface 511 and the high end of the second needle lifting surface 513 are respectively connected with two ends of the second needle returning surface 512, wherein the first needle returning surface 412 in the first needle returning assembly 4 is higher than the highest point of the cam knitting assembly 3, namely, the second needle returning path is positioned above the cam knitting assembly 3, and the corresponding actual setting position of the first needle returning cam 41 can be in a space above the cam base plate 1 at two sides of the cam knitting assembly 3, but not be arranged at the position of the height of the cam knitting assembly 3, so that the transverse volume of the cam base plate 1 can be reduced to a certain extent; the position of the butt of part of the knitting needles is lower than that of the second needle return surface 512 before entering the knitting area or after exiting the knitting area due to other factors, and during movement, the butt of the knitting needle at the side of the second needle return assembly 5 moves along the first needle lifting surface 511 or the second needle lifting surface 513 and finally moves to the second needle return 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, as shown in fig. 1, when the butt moves from right to left relative to the cam base plate 1, part of the knitting needles can cause up and down needle-threading due to inertia, tightness of the needle grooves and tension of yarns, so that the height of the butt is lower than that of the first needle return surface 412, and the butt moves to the second needle return surface 512 under the guidance of the second needle lifting surface 513; when the butt moves from left to right relative to the cam base plate 1, the height of the butt is lower than that of the second back needle surface 512 due to the adjustment of the right density cam in the cam knitting unit 3, and the butt moves to the second back needle surface 512 under the guide of the first needle raising surface 511.

Preferably, as shown in fig. 4, the included angle between the connecting line between the high end and the low end of the first needle lifting surface 511 and the second needle returning surface 512 is E, the value range is 15-40 °, the included angle between the connecting line between the high end and the low end of the second needle lifting surface 513 and the second needle returning surface 512 is F, the value range is 15-40 °, the gradient of the first needle lifting surface 511 and the second needle lifting surface 513 in the angle range is relatively gentle, the condition that the inertia is excessive after the butt of the knitting needle moves on the first needle lifting surface 511 or the second needle lifting surface 513, the jump needle amplitude is large is avoided, correspondingly, the first needle lifting surface 511 can be an inclined surface or an arc surface, in this embodiment, the angle between the connecting line between the high end and the low end of the first needle raising surface 511 and the second needle returning surface 512 is 20 degrees, the angle between the connecting line between the high end and the low end of the second needle raising surface 513 and the second needle returning surface 512 is 20 degrees, the first needle raising surface 511 is an arc surface, the central angle range of the first needle raising surface 511 and the second needle raising surface 513 is 20-30 degrees, in fig. 4, the central angle of the first needle raising surface 511 is shown as C, the central angle of the second needle raising surface 513 is shown as D, the radius setting range is 25-30mm, and the first needle raising surface 511 and the second needle raising surface 513 in this range are more stable.

Preferably, during operation, the butt moves on the second needle return surface 512, the butt moves on the lower end surface of the second needle return surface 512, the distance between the butt and the distance between the lowest part of the second needle return cam 51 and the second needle return surface 512 are in the range of 1-1.5mm, the situation that the amplitude of the upper and lower needle strings is too large during operation of the knitting needle can be avoided, and meanwhile, the allowance is reserved, so that the knitting needle stably operates, and in the embodiment, the distance between the butt and the butt is 22mm, and accordingly, the distance between the lowest part of the second needle return cam 51 and the second needle return surface 512 can be set in the range of 20.5-21mm.

Preferably, the lower end of the first guiding surface 411 or the second guiding surface 413 is further provided with a first guiding surface 424 matched with the guiding surface at the lower part of the density triangle, when the density triangle descends to the limit position, the butt of the knitting needle moves to the first guiding surface 424 and then is matched with the guiding surface at the lower part of the density triangle, so that a long enough guiding path is provided for enabling the loop to be looped, then the loop is lifted directly through the first guiding surface 411 or the second guiding surface 413 and moves to the first needle return surface 412 to return to a certain height, and furthermore, the first guiding surface 424 is arranged on the first needle return triangle 41, so that the volume of the density triangle can be further reduced, and the space occupied by sliding of the density triangle can be further reduced. Preferably, the lower end of the first needle lifting surface 511 or the second needle lifting surface 513 is provided with a second needle guiding surface 514 matched with the needle guiding surface at the lower part of the density triangle, when the density triangle descends to the limit position, the butt of the knitting needle moves to the second needle guiding surface 514, then is matched with the needle guiding surface at the lower part of the density triangle, so that a long enough needle guiding path is provided for enabling a loop to be looped, then the loop is lifted directly through the first needle lifting surface 511 or the second needle lifting surface 513, moves to the second needle returning surface 512 and returns to a certain height, the second needle guiding surface 514 is arranged on the second needle returning triangle 51, the volume of the density triangle can be further reduced, the space occupied by sliding of the density triangle can be further reduced, the lower end of the first needle lifting surface 511 or the second needle lifting surface 513 is provided with a convex part, and the second needle lifting surface 514 is the upper end surface of the convex part. Specifically, in this embodiment, the first needle return assembly 4 is located on the left side of the cam knitting assembly 3, and the second needle return assembly 5 is located on the right side of the cam knitting assembly 3, so that the first guide needle surface 424 is located at the lower end of the second guide surface 413, the convex portion 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 convex portion.

In another embodiment of the present utility model, there is also provided a triangle mechanism, wherein the triangle mechanism comprises two structures, as follows:

the first cam mechanism includes a cam base plate 1, a needle pressing cam 2, a cam knitting assembly 3, an elastic triangle 6 and a needle return system provided in the above embodiment, where the cam knitting assembly 3 has a knitting path, and can be used for a knitting needle to travel in two directions for knitting, as shown in fig. 1, the needle pressing cam 2, the cam knitting assembly 3 and the elastic triangle 6 are sequentially arranged from left to right, the needle return system includes a first needle return assembly 4 and a second needle return assembly 5, the lower part of the first needle return assembly 4 is arranged between the needle pressing cam 2 and the left side of the cam knitting assembly 3, the upper part of the first needle return assembly 4 is arranged above the needle pressing cam 2, that is, the first needle return cam 41 is positioned between the needle pressing cam 2 and the left side of the cam knitting assembly 3, and the first needle blocking cam 42 is positioned above the needle pressing cam 2; correspondingly, the second needle return assembly 5 is installed on the right side of the triangular knitting assembly 3 and is located above the rubber string triangle 6, namely, the second needle return triangle 51 is located on the right side of the triangular knitting assembly 3 and is located above the rubber string triangle, and the lower end face of the second needle return triangle 51 and the rubber string triangle form a knitting path for rubber knitting.

Specifically, in the present embodiment, in the first cam mechanism, the first needle lifting surface 511 and the second needle lifting surface 513 are 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 needle returning surface is 7.5mm, and the total width of the second needle returning cam 51 is 20.5-20.8mm, so that the butt of the knitting needle is relatively stable, the inertia is small after the first needle lifting surface 511 or the second needle lifting surface 513 is moved, the upward jump amplitude of the butt of the knitting needle is small, and the butt of the knitting needle can quickly fall onto the second needle returning surface 512 and move along the second needle returning surface 512.

Specifically, the first cam mechanism further comprises a second needle blocking cam 52, the second needle blocking cam 52 is arranged at the upper end of the second needle returning cam 51, the second needle blocking cam 52 and the second needle returning cam 51 jointly form a second needle returning assembly 5, 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 butt of part of the 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, the needle jump amplitude of the knitting needles is large, the stable movement of the butt of the knitting needles on the needle returning surface and the stable return to a certain height are ensured,

under the structure of the first type of cam mechanism, as shown in fig. 5, in order to further reduce the installation space of the second needle blocking cam 52 on the cam base plate 1, that is, reduce the installation threaded hole, a connecting sheet 53 is connected between the second needle blocking cam 52 and the second needle returning cam 51, and the connecting sheet 53, the second needle returning face 512 and the second needle blocking face 521 form a second needle returning path, so that the second needle blocking cam 52 and the second needle returning cam 51 form a whole, that is, the installation hole of the second needle blocking cam 52 is not required to be arranged on the cam base plate 1, and the use is more convenient.

Wherein, as shown in fig. 6, the second type of triangle mechanism includes triangle bottom plate 1, needle pressing triangle 2, triangle braiding component 3, rubber string triangle 6 and the back needle system in the above-mentioned embodiment, triangle braiding component 3 has the knitting route, can supply knitting needle bidirectional movement, carry out bidirectional braiding, as shown in the figure, triangle braiding component 3, rubber string triangle 6 and needle pressing triangle 2 set gradually from left to right, second back needle component 5 lower part is located between needle pressing triangle 2 and triangle braiding component 3 right side, second back needle component 5 lower part is located rubber string triangle 6 top, namely second back needle triangle 51 is located between needle pressing triangle 2 and triangle braiding component 3 right side, and be located rubber string triangle 6 top, first back needle component 4 is located triangle braiding component 3 left side, namely first back needle triangle 41 and first blocking needle triangle 42 are located triangle braiding component 3 left side.

In order to reduce the transverse installation space of the cam base plate 1 as much as possible, the second needle raising surface 513 of the second needle return cam 51 is steeper than the second needle raising surface 513 in the first cam mechanism, but the parameter setting of the first needle raising surface 511 is the same as the first needle raising surface 511 in the first cam mechanism, the transverse width is lower, but in order to reduce the inertia of the knitting butt after moving on the second needle raising surface 513, a second needle blocking cam 52 is also arranged on the second needle return cam 51, and at this time, the second needle blocking cam 52 has an installation position on the cam base plate 1 and is arranged above the needle pressing cam 2 due to the existence of the needle pressing cam 2.

The utility model further provides a machine head for bidirectional knitting, which comprises a first guide needle machine head and a second guide needle machine head, wherein the first guide needle machine head is used for knitting the front surface of the fabric, and the second guide needle machine head is used for knitting the back surface of the fabric; the first guide needle machine head comprises the needle return system of the embodiment, namely the first guide needle mechanism is internally provided with the first needle return assembly 4 and the second needle return assembly 5, the first needle return assembly 4 and the second needle return assembly 5 are respectively arranged at two sides of the inner triangular weaving assembly 3, two-way needle return can be carried out, the second guide needle machine head also comprises the needle return system of the embodiment, namely the second guide needle mechanism is internally provided with the first needle return assembly 4 and the second needle return assembly 5, and the first needle return assembly 4 and the second needle return assembly 5 are respectively arranged at two sides of the inner triangular weaving assembly 3, two-way needle return can be carried out, so that the consistency of the inner coils of the fabrics woven by the first guide needle machine head and the second guide needle machine head is ensured, and the weaving quality of the fabrics is ensured.

The above embodiments are only preferred embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present utility model are intended to be within the scope of the present utility model as claimed.

Claims (16)

1. The back needle system is arranged on a triangular bottom plate, and a triangular weaving assembly is arranged on the triangular bottom plate, and is characterized by comprising a first back needle assembly and a second back needle assembly, wherein the first back needle assembly and the second back needle assembly are arranged on two sides of the triangular weaving assembly;

the first needle return assembly is provided with a first needle return path, the second needle return assembly is provided with a second needle return path, and the first needle return path and the second needle return path are both positioned above the triangular weaving assembly and enable the return heights of the knitting butts to be the same.

2. The needle return system of claim 1 wherein the first needle return assembly comprises a first needle return cam and a first needle blocking cam;

the upper end of the first needle return triangle is provided with a guide surface and a first needle return surface, the guide surface is obliquely arranged, the high end of the guide surface is connected with the first needle return surface, and the lower end of the first needle blocking triangle is provided with a first needle blocking surface.

3. The needle return system of claim 2 wherein the guide surfaces comprise a first guide surface and a second guide surface, the first guide surface being disposed obliquely upward and the second guide surface being disposed obliquely downward, the first guide surface, the needle return surface, and the second guide surface being connected in side-to-side order.

4. The needle return system of claim 3 wherein the lower end of the first guide surface or the second guide surface is further provided with a first guide surface that mates with a guide surface of a lower portion of the density triangle.

5. The needle return system of claim 3 wherein said first needle guard cam lower end further has a first guide surface and a second guide surface, said first guide surface being disposed obliquely downward and said second guide surface being disposed obliquely upward, said first guide surface, said needle guard surface and said second guide surface being connected in side-to-side order.

6. The needle return system of claim 5 wherein the first guide surface is angled at 30-60 ° and the second guide surface is angled at 30-60 °.

7. The needle return system of claim 1 wherein the second needle return assembly includes a second needle return cam having a first needle lifting surface, a second needle return surface, and a second needle lifting surface at an upper end thereof;

the first needle lifting surface and the second needle lifting surface are respectively provided with 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 with the two ends of the second needle returning surface.

8. The needle return system of claim 7 wherein an angle between a line between the high end and the low end of the first needle raising surface and the second needle return surface is in the range of 15-40 °.

9. The needle return system of claim 7 wherein an angle between a line between the high end and the low end of the second needle raising surface and the second needle return surface is in the range of 15-40 °.

10. The needle return system of claim 7, wherein the lower end of the first needle lifting surface or the second needle lifting surface is further provided with a second needle guiding surface for use with a needle guiding surface of a lower part of the density triangle.

11. The needle return system of claim 7 further comprising a second needle blocking cam disposed at an upper end of the second needle blocking cam, a lower end of the second needle blocking cam having a second needle blocking surface.

12. The needle return system of claim 11 wherein a connecting web is connected between the second needle blocking cam and the second needle return cam, the connecting web, the second needle return face, and the second needle blocking face forming a needle return path.

13. The back needle system according to claim 7, wherein a distance between a butt of the knitting needle and a butt of the jack and a distance between a lowermost portion of the second back needle cam and the back needle face are in a range of 0.5 to 3.5mm.

14. The triangular mechanism is characterized by comprising a triangular base plate, a needle pressing triangular, a triangular knitting assembly, an elastic triangle and the needle returning system according to any one of claims 1-13, wherein the needle pressing triangular, the triangular knitting assembly and the elastic triangle are sequentially arranged, the lower part of the first needle returning assembly is arranged between the needle pressing triangular and one side of the triangular knitting assembly, the upper part of the first needle returning assembly is arranged above the needle pressing triangular, and the second needle returning assembly is arranged on the other side of the triangular knitting assembly and is positioned above the elastic triangle.

15. The triangular mechanism is characterized by comprising a triangular bottom plate, a needle pressing triangular, a triangular knitting assembly, an elastic triangle and the needle returning system according to any one of claims 1-13, wherein the triangular knitting assembly, the elastic triangle and the needle pressing triangular are sequentially arranged, the lower part of the second needle returning assembly is arranged between the needle pressing triangular and one side of the triangular knitting assembly, the lower part of the second needle returning assembly is arranged above the elastic triangle, and the first needle returning assembly is arranged on the other side of the triangular knitting assembly.

16. A head assembly for a flat knitting machine, comprising a first head comprising a needle return system according to any one of claims 1 to 13 and a second head comprising a needle return system according to any one of claims 1 to 13.