CN221028946U

CN221028946U - Head assembly of flat knitting machine

Info

Publication number: CN221028946U
Application number: CN202322823925.3U
Authority: CN
Inventors: 陈百祥; 王仁刚; 俞永保; 冯建明; 金建平
Original assignee: Zhejiang Baixiang Technology Co ltd
Current assignee: Zhejiang Baixiang Technology Co ltd
Priority date: 2023-04-28
Filing date: 2023-10-19
Publication date: 2024-05-28
Anticipated expiration: 2033-10-19

Abstract

The utility model relates to a head component of a flat knitting machine, wherein a first guide needle head comprises a first needle lifting cam, a first middle cam and a second needle lifting cam, so that a first face of a fabric can be independently knitted, and the first middle cam has a half-height position and a full-height position, so that the knitting mode of the first face comprises full-mesh knitting and hanging-mesh knitting; the first guide needle machine head and the second guide needle machine head can weave in the same direction, so that the weaving efficiency is improved, and meanwhile, the first surface and the second surface can be combined in a weaving mode, so that more weaving patterns or special weaving effects are displayed.

Description

Head assembly of flat knitting machine

Technical Field

The utility model relates to the technical field of knitting, in particular to a head assembly of a flat knitting machine.

Background

The weaving process of the electric control glove machine is generally as follows: the cam mechanism is moved to force the knitting needles to do regular lifting motion in the needle grooves of the needle plate, and the yarns can be knitted into knitted fabrics through the actions of the needle hooks and the needle tongues, and the loops gradually withdraw from the needle hooks in the ascending process of the knitting needles. When the existing electric control glove knitting machine is used for knitting gloves, two triangular mechanisms are matched, specifically, when the guide needle machine head moves from left to right, a needle lifting triangle of a guide needle triangular bottom plate in the rear guide needle machine head pushes up knitting needles on a rear needle bed and eats yarns in a yarn nozzle to finish a knitting action; correspondingly, when the guide needle machine head moves from right to left, a needle lifting cam of a guide needle cam bottom plate in the front guide needle machine head pushes up a knitting needle on a front needle bed and bites yarn in the same yarn nozzle in a relay manner to complete another knitting action; the guide needle machine head finishes a reciprocating motion from left to right to back to left, namely finishing a row of needles, and continuously and circularly running the loops, and the yarns are woven in a spiral mode.

The knitting mode of the electric control glove knitting machine that the knitting is performed without knitting is called hanging, namely tucking, gold ingot needles and toe cap needles, is a conventional knitting mode and is used for being matched with other knitting modes to form various knitting lines or special knitting effects. The hanging mesh weaving is as follows: the latch is opened and withdrawn from the latch to hang on the needle bar, the needle hooks hook the newly laid yarn and pull and bend the newly laid yarn into loops in the descending process, meanwhile, the original loops are separated from the needle hooks, the new loops pass through the old loops and are connected with the old loops in series, and a plurality of loops which are knitted are connected with each other to form the knitted fabric. Because the existing guide needle machine head can only be spirally woven in one direction, the hanging mesh can also be spirally woven in one direction, the weaving mode is single, and the weaving efficiency and the weaving effect are limited.

Disclosure of utility model

The technical problem to be solved by the utility model is to overcome the defects in the prior art, thereby providing a head assembly of a flat knitting machine.

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

a head assembly for a flat knitting machine, comprising:

a first guide needle machine head for knitting a first face of the fabric,

The first guide needle machine head and the second guide needle machine head are arranged oppositely and can do reciprocating knitting motion in the same direction along the knitting direction so as to knit the first face and the second face simultaneously; wherein,

The first guide needle machine head comprises a first triangle base plate, a first middle triangle, a first knitting needle triangle, a first needle lifting triangle, a second needle lifting triangle, a first density triangle and a second density triangle, wherein the first middle triangle is arranged in the middle of the first triangle base plate, the first needle lifting triangle is arranged on one side of the first middle triangle, the second needle lifting triangle is arranged on the other side of the first middle triangle, and the first middle triangle can move along the thickness direction of the first triangle base plate and has a half-height position and a full-height position;

The second guide needle machine head comprises a second triangular bottom plate, a second middle triangle, a second knitting needle triangle, a third needle lifting triangle, a fourth needle lifting triangle, a third density triangle and a fourth density triangle, wherein the second middle triangle is arranged in the middle of the second triangular bottom plate, the third needle lifting triangle is arranged on one side of the second middle triangle, the fourth needle lifting triangle is arranged on the other side of the second middle triangle, and the second middle triangle can move along the thickness direction of the second triangular bottom plate and has a half-height position and a full-height position.

Preferably, the first needle lifting triangle and the second needle lifting triangle and the first middle triangle at the full-height position form a first bi-directional needle guide channel of a first surface; the first needle lifting triangle, the second needle lifting triangle and the first middle triangle at the half-height position form a second bidirectional needle guide channel of a first surface;

the third needle lifting triangle, the fourth needle lifting triangle and the second middle triangle at the full-height position form a first two-way needle guide channel of the second surface, and the third needle lifting triangle, the fourth needle lifting triangle and the second middle triangle at the half-height position form a second two-way needle guide channel of the second surface.

Preferably, the nose assembly further comprises a first triangle control mechanism, wherein the first triangle control mechanism is at least partially positioned on the back surface of the first triangle bottom plate and drives the first middle triangle to move to the half-height position or the full-height position;

The machine head assembly further comprises a second triangular control mechanism, wherein the second triangular control mechanism is at least partially positioned on the back surface of the second triangular bottom plate and drives the second middle triangle to move to the half-height position or the full-height position.

Preferably, the first cam control mechanism and the second cam control mechanism can simultaneously control the first middle cam and the second middle cam to move to a half-height position or a full-height position respectively;

Or the first triangle control mechanism controls the first middle triangle to move to a half-height position, and the second triangle control mechanism controls the second middle triangle to move to a full-height position;

or the first triangle control mechanism controls the first middle triangle to move to the full-height position, and the second triangle control mechanism controls the second middle triangle to move to the half-height position.

Preferably, the first middle triangle comprises a first pin which is positioned on the back surface and penetrates through the first triangle bottom plate, the first pin comprises a first abutting part, the first triangle control mechanism comprises a first half needle pushing foot, and a first inclined surface and a first high surface are arranged on one side end surface of the first half needle pushing foot, which is close to the first pin;

When the first abutting part is tangent to the first inclined plane or separated from the first inclined plane, the first middle triangle is positioned at the full-height position; when the first abutting part is in contact with the first high surface, the first middle triangle is positioned at the half-height position.

Preferably, the first half needle pushing foot further comprises a second inclined plane and a first concave plane, the first inclined plane and the second inclined plane are arranged in a back-to-back mode, the first high plane is connected with the highest position of the first inclined plane and the highest position of the second inclined plane to form a first boss, the lowest position of the second inclined plane is connected with the first concave plane to form a first groove, when the first abutting portion is located in the first groove, the first middle triangle is located in the full high position, when the first abutting portion is located in the first boss, the first middle triangle is located in the half high position.

Preferably, a first return spring for enabling the first middle triangle to have a trend of returning from the half-height position to the full-height position is arranged between the first pin and the back surface of the first triangle bottom plate; and/or

The middle part of the first half needle pushing foot is provided with a second reset spring which enables the first half needle pushing foot to have a trend of returning to the initial position.

Preferably, the first triangle control mechanism further comprises a first pushing part and a first driving assembly, wherein the first pushing part is arranged on the first half needle pushing foot, the first driving assembly is used for pushing the first pushing part, the first half needle pushing foot is rotationally connected with the first triangle bottom plate, one end of the first half needle pushing foot is linked with the first pin, the other end of the first half needle pushing foot is rotationally connected with the first pushing part, and the first pushing part is in rotational fit with the first driving assembly.

Preferably, the first driving assembly comprises a first motor, a first ejector rod and a first cam, wherein the first motor drives the first cam to rotate, so that the first ejector rod has a first rest position and a first driving position,

When the first ejector rod is positioned at the first rest position, the first ejector rod is in contact with the first pushing piece and enables the first abutting part to be tangential to the first inclined plane or separated from the first inclined plane;

When the first ejector rod is positioned at the first driving position, the first pushing piece is lifted up, and the first abutting part abuts against the first high surface.

Preferably, the first motor drives the first cam to rotate, so that the first ejector rod further has a second driving position, and when the first ejector rod is located at the second driving position, the first pushing member is lifted up, and the first abutting portion is located in the first groove.

Preferably, the first cam is in transmission connection with a first output shaft of the first motor, and a first curve groove capable of enabling the first ejector rod to reach the first rest position, the first driving position and the second driving position is formed in the first cam;

The first ejector rod is provided with a first chute and a first bulge, the first output shaft penetrates through the first chute, the first bulge is arranged in the first curve groove, the first motor rotates to enable the first bulge to move along the first curve groove so as to change the relative position of the first bulge and the first output shaft, and the first ejector rod is driven to move among the first rest position, the first driving position and the second driving position.

Preferably, the second middle triangle comprises a second pin which is positioned on the back surface and penetrates through the second triangle bottom plate, the second pin comprises a second abutting part, the second triangle control mechanism comprises a second half-needle pushing foot, and a third inclined surface and a second high surface are arranged on one side end surface of the second half-needle pushing foot, which is close to the second pin;

When the second abutting part is tangent to the third inclined plane or separated from the second inclined plane, the second middle triangle is positioned at the full-height position; when the second abutting part is in contact with the second high surface, the second middle triangle is positioned at the half-height position.

Preferably, the second half-needle pushing foot further comprises a fourth inclined plane and a second concave plane, the third inclined plane and the fourth inclined plane are arranged in opposite directions, the second high plane is connected with the highest position of the third inclined plane and the highest position of the fourth inclined plane to form a second boss, the lowest position of the fourth inclined plane is connected with the second concave plane to form a second groove, when the second abutting part is located in the second groove, the second middle triangle is located in the full high position, when the second abutting part is located in the second boss, the second middle triangle is located in the half high position.

Preferably, a third return spring for enabling the second middle triangle to have a trend of returning from the half-height position to the full-height position is arranged between the second pin and the back surface of the second triangle bottom plate; and/or

And a fourth reset spring which enables the second half needle pushing foot to have a trend of returning to the initial position is arranged in the middle of the second half needle pushing foot.

Preferably, the second triangle control mechanism further comprises a second pushing part arranged on the second half needle pushing foot and a second driving assembly for pushing the second pushing part, the second half needle pushing foot is rotationally connected with the second triangle bottom plate, one end of the second half needle pushing foot is linked with the second pin, the other end of the second half needle pushing foot is rotationally connected with the second pushing part, and the second pushing part is rotationally matched with the second driving assembly.

Preferably, the second driving assembly comprises a second motor, a second ejector rod and a second cam, the second motor drives the second cam to rotate, so that the second ejector rod has a second rest position and a third driving position,

When the second ejector rod is positioned at the second rest position, the second ejector rod is in contact with the second pushing piece and makes the second abutting part tangential to or separated from the third inclined surface;

When the second ejector rod is positioned at the third driving position, the second ejector rod is lifted up, and the second abutting part is abutted with the second high surface.

Preferably, the second motor drives the second cam to rotate, so that the second ejector rod further has a fourth driving position, and when the second ejector rod is located at the fourth driving position, the second pushing member is lifted up and the second abutting portion is located in the second groove.

Preferably, the second cam is in transmission connection with a second output shaft of the second motor, and a second curve groove capable of enabling the second ejector rod to reach the second rest position, the second driving position and the second driving position is formed in the second cam;

The second ejector rod is provided with a second chute and a second bulge, the second output shaft penetrates through the second chute, the second bulge is arranged in the second curve groove, the second motor rotates to enable the second bulge to move along the second curve groove so as to change the relative position of the second bulge and the second output shaft, and the second ejector rod is driven to move among the second rest position, the third driving position and the fourth driving position.

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

The first guide needle head comprises a first needle lifting cam, a first middle cam and a second needle lifting cam, so that the first face of the fabric can be independently woven, the first middle cam has a half-height position and a full-height position, the weaving mode of the first face comprises full-mesh weaving and hanging-mesh weaving, and meanwhile, the second guide needle head comprises a third needle lifting cam, a second middle cam and a fourth needle lifting cam, so that the second face of the fabric can be independently woven, and the second middle cam also has a half-height position and a full-height position, so that the weaving mode of the second face also comprises full-mesh weaving and hanging-mesh weaving; the first guide needle machine head and the second guide needle machine head can weave in the same direction, so that the weaving efficiency is improved, and meanwhile, the first surface and the second surface can be combined in a weaving mode, so that more weaving patterns or special weaving effects are displayed.

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 diagram of a first guide pin head and a second guide pin head in an embodiment of the present utility model.

Fig. 2 is a schematic structural diagram of a first guide pin head according to an embodiment of the present utility model, where 2a is a back surface of the first guide pin head, and 2b is a front surface of the first guide pin head.

Fig. 3 is a schematic diagram of a first middle triangle and a first driving assembly according to an embodiment of the utility model.

Fig. 4 is a schematic view of a first half needle pushing foot in the embodiment of fig. 3.

Fig. 5 is a schematic view of the first intermediate triangle and the first driving assembly in the embodiment of fig. 3, 5a is a structural rear view, 5b is a structural top view, wherein the first intermediate triangle is in a full height position, and the first ejector rod is in a first rest position.

Fig. 6 is a schematic diagram of the first intermediate triangle and the first driving assembly in the embodiment of fig. 3, 6a is a structural rear view, 6b is a structural top view, wherein the first intermediate triangle is in a half-height position, and the first ejector rod is in a first driving position.

Fig. 7 is a schematic diagram of the first middle triangle and the first driving assembly in the embodiment of fig. 3, 7a is a structural rear view, and 7b is a structural top view, wherein the first middle triangle is at a full height position, and the first ejector rod is at a second driving position.

Reference numerals illustrate:

1. A first guide pin head; 11. a first triangular bottom plate; 12. a first intermediate triangle; 121. a first pin; 122. a first abutting portion; 123. a first return spring; 13. a first needle cam; 14. a first needle cam; 15. a second needle lifting triangle; 16. a first density triangle; 17. a second density triangle;

2. A second guide pin machine head; 21. a second triangular bottom plate; 22. a second intermediate triangle; 23. a second needle cam; 24. a third needle raising triangle; 25. a fourth needle lifting triangle; 26. a third density triangle; 27. a fourth density triangle;

3. A first pushing assembly; 31. a first pushing member; 32. the first half needle pushes the foot; 321. a first end face; 322. a first inclined surface; 323. a second inclined surface; 324. a first elevation surface; 325. a first concave surface; 326. a first boss; 327. a first groove; 328. a second return spring;

4. A first drive assembly; 41. a first motor; 411. a first output shaft; 42. a first ejector rod; 421. a first protrusion; 422. a first chute; 43. a first cam; 431. a first curvilinear slot; 432. a first curve segment; 433. a second curve segment; 434. a third curve segment; 435. a fourth curve segment; 436. and a fifth curve segment.

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, an embodiment of the present utility model provides a head assembly of a flat knitting machine, including a first guide needle head 1 for knitting a first face of a fabric, a second guide needle head 2 for knitting a second face of the fabric, the first guide needle head 1 and the second guide needle head 2 being disposed opposite to each other and capable of performing a reciprocating knitting motion in the same direction along a knitting direction to simultaneously knit the first face and the second face; the first face and the second face are oppositely arranged in a knitting state, the corresponding first guide needle machine head 1 and the corresponding second guide needle machine head 2 are also oppositely arranged, when the knitting machine is applied to knitting equipment, the knitting equipment comprises two needle beds which are oppositely arranged at intervals, the two needle beds respectively extend along the knitting direction, the first guide needle machine head 1 corresponds to one needle bed for knitting the first face, and the second guide needle machine head 2 corresponds to the other needle bed for knitting the second face. The first face includes a plurality of first coil lines that connect gradually vertically, and every first coil line is including a plurality of first coils that connect gradually transversely, and the second face includes a plurality of second coil lines that connect gradually vertically, and every second coil line is including a plurality of second coils that connect gradually transversely. It is noted that, in this embodiment, the vertical direction may be a direction perpendicular to the horizontal plane, or a direction not perpendicular to the horizontal plane, and the horizontal direction may be a horizontal direction, or a non-horizontal direction, and an angle between the vertical direction and the horizontal direction may be a right angle, or a non-right angle. When the first guide needle machine head 1 and the second guide needle machine head 2 do reciprocating knitting motion in the same direction along the knitting direction, the first guide needle machine head 1 and the second guide needle machine head 2 can be synchronous, so that seam knitting is performed, the first guide needle machine head 1 and the second guide needle machine head 2 stitch the end parts of the first surface and the second surface, and the first guide needle machine head 1 and the second guide needle machine head 2 synchronously refer to respectively controlling the corresponding needle beds to extend out of the knitting needles and hook the same strand of yarn; the first guide needle machine head 1 and the second guide needle machine head 2 are staggered to set the travel, so that corresponding surfaces are independently woven, the first guide needle machine head 1 is used for independently weaving the first surface, the second guide needle machine head 2 is used for independently weaving the second surface, and then the first surface and the second surface are connected at the edge joint part to connect the side edges of the first surface and the second surface together. The braiding direction includes a first direction and a second direction that are parallel and opposite in direction.

To achieve the knitting function of the first needle head 1, the first needle head 1 comprises a first cam base 11, a first intermediate cam 12, a first needle cam 13, a first needle cam 14, a second needle cam 15, a first density cam 16 and a second density cam 17, the first cam base 11 being a mounting base for mounting the cams, the first intermediate cam 12, also known as a middle cam, acting as a thimble, the first needle cam 13, also known as a herringbone cam, acting as a highest position for the knitting needle and guiding the knitting needle, the first needle cam 14 and the second needle cam 15 being needle cams, as oriented in fig. 3, the first intermediate cam 12 being located in the middle of the first cam base 11, the first needle cam 12 being located above the first intermediate cam 12 and being arranged at a distance, the first needle cam 14 being located on the left side of the first intermediate cam 12 and thus also being referred to as a left needle cam, the first density cam 16 being arranged at a distance above the first needle cam 14 and thus also being referred to as a left needle cam, the second intermediate cam 12, and the second needle cam 15 being located on the right and thus being referred to as a right needle cam 15.

Meanwhile, the first middle cam 12 of the present embodiment can move along the thickness direction of the first cam base plate 11, and has a half-height position and a full-height position, wherein the half-height position refers to the position where the first middle cam 12 protrudes from the height of the first cam base plate 11, so that the high needle still walks along the edge of the first middle cam 12 and is guided by the first knitting needle cam 13, and the low needle spans the first middle cam 12 from the surface of the first middle cam 12, such as the bidirectional stitch guide needle channel in fig. 2 b; the full high position refers to the height of the first middle cam 12 protruding from the first cam base plate 11 such that both the high and low needles run along the edge of the first middle cam 12 and are guided by the first needle cam 13, as in the bi-directional full-mesh guide needle channel of fig. 2 b. The height of the first middle triangle 12 protruding from the first triangle bottom plate 11 when in the full height position is the height of the full height position, the height of the first middle triangle 12 protruding from the first triangle bottom plate 11 when in the half height position is the height of the half height position, and the height of the half height position of the first middle triangle 12 may be 35% -65% of the height of the full height position, for example: when the height of the full height position is 4+/-0.5 mm, the height of the half height position is 2+/-0.5 mm.

The first needle raising cam 14 and the second needle raising cam 15 and the first intermediate cam 12 in the full height position form a first bi-directional needle guide channel of the first face, which may be a bi-directional full-mesh needle guide channel. Specifically, as shown in fig. 1, when the first needle guiding nose 1 moves along the first direction, the butt of the knitting needle enters a needle guiding channel between the first needle lifting triangle 14 and the first density triangle 16, rises along the needle lifting surface of the first needle lifting triangle 14, passes through the vertex of the first middle triangle 12, is controlled by the first needle triangle 13 and guides the knitting needle, so that the butt of the knitting needle descends along the first needle triangle 13, descends along the second density triangle 17 continuously, the height of the second density triangle 17 can be adjusted, and finally, the butt of the knitting needle passes through the bottom of the second density triangle and leaves the needle guiding channel, wherein the needle guiding channel is a full-mesh needle guiding channel in one direction; when the first guide needle machine head 1 moves along the second direction, the butt of the knitting needle enters a guide needle channel between the second needle raising cam 15 and the second density cam 17, rises along the needle raising surface of the second needle raising cam 15, then passes through the top point of the first middle cam 12, is controlled by the first knitting needle cam 13 and guides the knitting needle, so that the butt of the knitting needle descends along the first knitting needle cam 13, then descends continuously along the first density cam 16, the height of the first density cam 16 can be adjusted, finally, the butt of the knitting needle passes through the bottom of the first density cam 16 and leaves a guide needle channel which is a full-mesh guide needle channel in the other direction; thereby enabling the first guide-needle handpiece 1 to be knitted in both the first direction and the second direction, whereby the first guide-needle handpiece has a first bi-directional guide-needle channel, i.e. a bi-directional full-mesh guide-needle channel, as shown in fig. 2 b.

The first needle cam 14 and the second needle cam 15 and the first middle cam 12 and the first needle cam 13 in the half-height position form a second bidirectional guide needle channel of the first surface, and the second bidirectional guide needle channel can be a bidirectional lifting guide needle channel. Specifically, when the first needle guiding nose 1 moves along the first direction, the butt of the knitting needle enters a needle guiding channel between the first needle lifting triangle 14 and the first density triangle 16, and rises along the needle lifting surface of the first needle lifting triangle 14, the butt of the knitting needle of the low needle is not blocked because the first middle triangle 12 is positioned at the half-height position, and spans the first middle triangle 12, then continuously descends along the second density triangle 17, the stitch value can be adjusted by adjusting the height of the second density triangle 17, and finally, the butt of the knitting needle passes through the bottom of the second density triangle and leaves the needle guiding channel, and the needle guiding channel is a stitch guiding channel in one direction; when the first guide needle machine head 1 moves along the second direction, the butt of the knitting needle enters a guide needle channel from the position between the second needle lifting triangle 15 and the second density triangle 17, and rises along the needle lifting surface of the second needle lifting triangle 15, the butt of the knitting needle of the low needle is not blocked because the first middle triangle 12 is positioned at the half-height position, crosses the first middle triangle 12, continuously descends along the first density triangle 16, the stitch value can be adjusted by adjusting the height of the first density triangle 16, and finally, the butt of the knitting needle passes through the bottom of the first density triangle 16 and leaves a guide needle channel which is a lifting guide needle channel in the other direction; thereby enabling the first slider 1 to perform stitch-lifting knitting in both the first direction and the second direction, whereby the first slider has a second bi-directional needle channel, i.e. a bi-directional stitch-lifting guide channel, as shown in fig. 2 b.

Similarly, to implement the knitting function of the second needle head 2, the second needle head 2 includes a second cam base 21, a second middle cam 22, a second needle cam 23, a third needle cam 24, a fourth needle cam 25, a third density cam 26, and a fourth density cam 27, the second cam base 21 is a mounting base for mounting each cam, the second middle cam 22, which functions as a thimble, the second needle cam 23, which functions as a herringbone cam, limits the highest position of the knitting needle, guides the knitting needle, the third needle cam 24 and the fourth needle cam 25 are both needle cams, when the front face of the cam on the second cam base faces the user, the second middle cam 22 is located in the middle of the second cam base 21, the second needle cam 23 is located above the second middle cam 22 and is set at a spacing, the third needle cam 24 is located on the left side of the second middle cam 22, and thus may also be referred to as a left needle cam, the third density cam 26, which corresponds to a spacing, is located above the third needle cam 24, and the fourth needle cam 25, and thus may also be referred to as a right triangle 25, which corresponds to a right triangle and may be set at a spacing.

It should be noted that the second guide pin head in fig. 1 is symmetrically disposed with respect to the first guide pin head, and is inverted, so that the positional relationship of the triangles is different from that described above. The second middle triangle 22 and the second knitting needle triangle 23 in the second guide needle machine head 2 are identical to the first middle triangle 12 and the first knitting needle triangle 13 in the first guide needle machine head 1 in structure; when the first needle guide head 1 and the second needle guide head 2 are oppositely arranged on the needle bed, the third needle raising triangle 24 and the third density triangle 26 are in central symmetry with the first needle raising triangle 14 and the first density triangle 16, have the same structure, and the fourth needle raising triangle 25 and the fourth density triangle 27 are in central symmetry with the second needle raising triangle 15 and the second density triangle 17, and have the same structure.

Meanwhile, the second middle cam 22 of the present embodiment can move along the thickness direction of the second cam base plate 21, and has a half-height position and a full-height position, wherein the half-height position refers to the position where the second middle cam 22 protrudes from the second cam base plate 21, so that the high needle still runs along the edge of the second middle cam 22 and is guided by the second knitting needle cam 23, and the low needle spans the second middle cam 22 from the surface of the second middle cam 22, such as the bidirectional stitch guiding needle channel in fig. 2 b; the full high position refers to the second intermediate cam 22 protruding above the height of the second cam base 21 such that both the high and low needles run along the edge of the second intermediate cam 22 and are guided by the second needle cam 23, as in the bi-directional full-mesh guide channel of fig. 2 b. The second middle triangle 22 protrudes from the second triangle bottom plate 21 to have a full height when the second middle triangle 22 is at the full height, and protrudes from the second triangle bottom plate 21 to have a half height when the second middle triangle 22 is at the half height, and the half height of the second middle triangle 22 may be 0.35% -65% of the full height, for example: when the height of the full height position is 4+/-0.5 mm, the height of the half height position is 2+/-0.5 mm.

The third and fourth needle raising cams 24, 25 and the second intermediate cam 22 in the full-height position form a first bi-directional needle guide channel of the second face, which may be a bi-directional full-mesh needle guide channel. Specifically, as shown in fig. 1, when the second needle guiding nose 2 moves along the first direction, the butt of the knitting needle enters a needle guiding channel between the fourth needle lifting cam 25 and the fourth density cam 27, rises along the needle lifting surface of the fourth needle lifting cam 25, passes through the vertex of the second middle cam 22, is controlled by the second needle cam 23 and guides the knitting needle, so that the butt of the knitting needle descends along the second needle cam 23, descends along the third density cam 26 continuously, the stitch value can be adjusted by adjusting the height of the third density cam 26, and finally, the butt of the knitting needle passes through the bottom of the third density cam 26 and leaves the needle guiding channel, and the needle guiding channel is a full-mesh needle guiding channel in one direction; when the first guide needle machine head 1 moves along the second direction, the butt of the knitting needle enters a guide needle channel between the third needle raising cam 24 and the third density cam 26, rises along the needle raising surface of the third needle raising cam 24, then passes through the top point of the second middle cam 22, is controlled by the second knitting needle cam 23 and guides the knitting needle, so that the butt of the knitting needle descends along the second knitting needle cam 23, then descends continuously along the fourth density cam 27, the height of the fourth density cam 27 can be adjusted, and finally, the butt of the knitting needle passes through the bottom of the fourth density cam 27 and leaves the guide needle channel, and the guide needle channel is a full-mesh guide needle channel in the other direction; thereby realizing that the second guide needle head 2 can be knitted in both the first direction and the second direction, whereby the second guide needle head 2 has a first bi-directional guide needle channel, i.e. a bi-directional full-mesh guide needle channel.

The third lifting cam 24 and the fourth lifting cam 25 form a second bidirectional guide needle channel of the second face with the second middle cam 22 and the second knitting needle cam 23 in the half-height position, and the second bidirectional guide needle channel can be a bidirectional lifting guide needle channel. Specifically, when the second needle guiding nose 2 moves along the first direction, the butt of the knitting needle enters a needle guiding channel between the fourth needle lifting triangle 25 and the fourth density triangle 27, and rises along the needle lifting surface of the fourth needle lifting triangle 25, the butt of the knitting needle of the low needle is not blocked because the second middle triangle 22 is positioned at the half-height position, passes through the second middle triangle 22, continuously descends along the third density triangle 26, the stitch value can be adjusted by adjusting the height of the third density triangle 26, and finally, the butt of the knitting needle passes through the bottom of the third density triangle 26 and leaves the needle guiding channel, and the needle guiding channel is a full-mesh needle guiding channel in one direction; when the first guide needle machine head 1 moves along the second direction, the butt of the knitting needle enters a guide needle channel from between the third needle raising cam 24 and the third density cam 26, rises along the needle raising surface of the third needle raising cam 24, and is not blocked because the second middle cam 22 is positioned at the half-height position, crosses over the second middle cam 22, continuously descends along the fourth density cam 27, the height of the fourth density cam 27 can be adjusted, the mesh value can be adjusted, finally, the butt of the knitting needle passes through the bottom of the fourth density cam 27 and leaves the guide needle channel, and the guide needle channel is a full-mesh guide needle channel in the other direction; thereby realizing that the second guide needle head 2 can be knitted in both the first direction and the second direction, whereby the second guide needle head 2 has a first bi-directional guide needle channel, i.e. a bi-directional full-mesh guide needle channel. The routing of the second lead frame head 2 is not shown in the figures and may be the same as the routing of the first lead frame head 1 in fig. 2 b.

The machine head assembly further comprises a first triangle control mechanism, wherein the first triangle control mechanism is at least partially positioned on the back surface of the first triangle bottom plate, and can drive a corresponding triangle of the first guide needle machine head; the nose assembly further comprises a second triangle control mechanism, the second triangle control mechanism is at least partially located on the back face of the second triangle bottom plate, the second triangle control mechanism can drive a corresponding triangle of the second guide needle nose, and in the embodiment, the second triangle control mechanism can drive the second middle triangle to move to the half-height position or the full-height position. Since the first intermediate triangle and the second intermediate triangle are unpowered by themselves, the driving forces of the first triangle control mechanism and the second triangle control mechanism are required, and the first triangle control mechanism and the second triangle control mechanism can be independently controlled by the knitting system, thereby realizing diversification. Specifically, in some braiding methods, to achieve simultaneous stitch braiding of the first and second faces, the first and second drive assemblies 4, 22 are configured to simultaneously drive the first and second intermediate cams 12, 22, respectively, to a half-height position or a full-height position; in other knitting modes, if the first surface is required to be knitted by hanging stitch, and the second surface is knitted by full stitch, the first driving component 4 drives the first middle triangle 12 to move to the half-height position, and the second driving component drives the second middle triangle 22 to move to the full-height position; in other knitting modes, if it is desired to stitch the second surface, and the first surface is stitch-bonded, the second intermediate cam 22 is driven to move to the half-height position by the second driving means, and the first intermediate cam 12 is driven to move to the full-height position by the first driving means 4. Of course, in some embodiments, when the first driving component 4 is in the inactive state, the initial position of the first middle triangle 12 is the full height position, and the first driving component 4 does not need to drive the first middle triangle 12; similarly, when the second driving assembly is in the inactive state, the initial position of the second intermediate triangle 22 is the full height position, and the second driving assembly does not need to drive the second intermediate triangle 22.

Taking the first guide pin machine head 1 as an example, in some embodiments, the first middle triangle 12 includes a first pin 121 located on the back surface and penetrating through the first triangle bottom plate 11, the first pin 121 includes a first abutting portion 122, the first triangle control mechanism includes a first half pin pushing leg 32, and a first inclined surface 322 and a first raised surface 324 are disposed on one side end surface of the first half pin pushing leg 32 close to the first pin; the first half needle pushing leg 32 is in a zigzag shape, the first end face 321 faces the back face of the first triangle bottom plate 11, the second end face faces away from the back face of the first triangle bottom plate 11, the first inclined face 322 and the first high face 324 are arranged on the second end face, the body of the first pin 121 is perpendicular to the first triangle bottom plate 11, one end of the first abutting portion 122 is connected with the body, the other end extends to the second end face crossing the first half needle pushing leg 32, therefore, when the first half needle pushing leg 32 moves relative to the first pin 121, the first abutting portion 122 can move along the first end face 321, and the distance between the first inclined face 322 and the back face of the first triangle bottom plate 11 is different, so that the distance between the first abutting portion 122 and the first triangle bottom plate 11 is changed, and the first middle triangle 12 is driven to move along the perpendicular and first basic thickness direction. When the first abutting part is tangent to the first inclined plane or separated from the first inclined plane, the first middle triangle is positioned at the full-height position; when the first abutting part is in contact with the first high surface, the first middle triangle is positioned at the half-height position.

In other embodiments, as shown in fig. 3 and fig. 4, to increase the utilization of the first cam control mechanism, the first middle cam 12 and the first needle cam 14 are linked, so that the first guide needle head has more knitting modes, and therefore, more structures need to be arranged on the first half needle pushing leg 32 to match the control mechanism corresponding to the first needle cam. Specifically, the first half needle pushing leg 32 further includes a second inclined plane 323 and a first concave plane 325, the second inclined plane 323 and the first concave plane 325 are both disposed on a side, close to the first pin, of the second end face of the first half needle pushing leg 32, the first inclined plane 322 and the second inclined plane 323 are disposed opposite to each other, the first high plane 324 is connected with a highest portion of the first inclined plane 322 and a highest portion of the second inclined plane 323 to form a first boss 326, a lowest portion of the second inclined plane 323 is connected with the first concave plane 325 to form a first groove 327, and the first abutting portion 122 can move along the first inclined plane 322, the first high plane 324, the second inclined plane 323 and the first concave plane 325. Therefore, when the first abutting part is tangent to or separated from the first inclined plane, the first middle cam is positioned at the full-height position, and the first needle cam is positioned at the full-height position and corresponds to a bidirectional full-mesh knitting mode; when the first abutting part is positioned on the first boss, the first middle triangle is positioned at a half-height position, and the first stitch cam is positioned at a full-height position and corresponds to a bidirectional stitch knitting mode; when the first abutting part is positioned in the first groove, the first middle triangle is positioned at the full-height position, the front face of the first needle starting triangle is flush with the front face of the first triangle bottom plate, and the first middle triangle corresponds to a unidirectional full-mesh knitting mode.

The initial position of the first half needle pushing leg 32 is a position when the first abutting part is tangent to the first inclined plane or separated from the first inclined plane, the first half needle pushing leg 32 is unpowered and needs to be pushed by external force, the external force source can be the first driving component 4 in the first triangle control mechanism, if the first half needle pushing leg 32 is not directly connected with the first driving component 4 but is in force transmission through contact and abutting, when the first driving component 4 is separated from the first half needle pushing leg 32, the first half needle pushing leg 32 needs to be reset, and therefore, the middle part of the first half needle pushing leg 32 is provided with the second reset spring 328 for driving the first half needle pushing leg 32 to rotate to the initial position; similarly, the first middle cam 12 is also unpowered, and when the first half needle pushing leg 32 returns to the initial position or the first abutting portion is located in the first groove, the first middle cam 12 needs to be reset, so a first return spring 123 is disposed between the first pin 121 and the back surface of the first cam base plate 11, so that when the first half needle pushing leg 32 returns to the initial position or the first abutting portion is located in the first groove, the first pin 121 approaches the back surface of the first cam base plate 11 under the action of the first return spring 123, and the first middle cam 12 is reset from the half height position to the full height position.

As shown in fig. 3, the first triangle control mechanism further includes a first pushing member disposed on the first half-needle pushing leg and a first driving assembly for pushing the first pushing member, the first half-needle pushing leg is rotationally connected with the first triangle bottom plate, one end of the first half-needle pushing leg is linked with the first pin, the other end of the first half-needle pushing leg is rotationally connected with the first pushing member, and the first pushing member is rotationally matched with the first driving assembly. The first driving component is generally arranged below the first guide needle machine head and does not reciprocate along with the first guide needle machine head in the knitting direction, so that the first pushing component arranged on the back surface of the first triangle bottom plate needs to be in rotary fit with the first driving component to reduce friction, and the first pushing component can be a bearing or a roller.

As shown in fig. 3, the first driving assembly 4 includes a first motor 41, a first jack 42, and a first cam 43. In some embodiments, the first motor 41 drives the first cam 43 to rotate, so that the first ejector rod 42 has a first rest position and a first driving position, the first half-needle pushing leg 32 is rotationally connected with the first triangle base plate 11, one end of the first half-needle pushing leg 32 is linked with the first pin 121, the other end is connected with the first pushing member 31, the first pushing member 31 is matched with the first driving assembly 4, and the first half-needle pushing leg 32 is driven to rotate under the action of the first driving assembly 4, so that the first abutting portion 122 moves along the second end face of the first half-needle pushing leg 32. When the first ejector rod 42 is located at the first rest position, the first ejector rod is in contact with the first pushing piece 31, so that the first abutting part 122 is tangential to or separated from the first inclined plane, and the first middle triangle is located at the full height position; when the first ejector rod is positioned at the first driving position, the first pushing piece is lifted up, the first abutting part abuts against the first high surface, and the first middle triangle is positioned at the half-high position.

In other embodiments, in order to correspond to the first groove, the first ejector rod further has a second driving position, and the first motor drives the first cam to rotate, so that the first ejector rod further has a second driving position, and when the first ejector rod is located in the second driving position, the first ejector member is lifted up and the first abutting portion is located in the first groove.

Specifically, the first cam 43 is in transmission connection with the first output shaft 411 of the first motor 41, and the first cam 43 is provided with a first curved slot 431 capable of enabling the first ejector rod 42 to reach a first rest position, a first driving position and a second driving position; the first ejector rod 42 is provided with a first chute 422 and a first protrusion 421, the first output shaft 411 passes through the first chute 422, the first protrusion 421 is placed in the first curved groove 431, and the first motor 41 rotates to enable the first protrusion 421 to move along the first curved groove 431 so as to change the relative position of the first protrusion 421 and the first output shaft 411, and the first ejector rod 42 is driven to move among a first rest position, a first driving position and a second driving position.

The first curved groove 431 includes a first curved section 432, a second curved section 433, a third curved section 434, a fourth curved section 435 and a fifth curved section 436 which are sequentially communicated from the beginning to the end, the beginning of the first curved section 432 is the beginning of the first curved groove 431, and the distances from the beginning to the end to the center a of the first cam 43 are La1, the second curved section 433 is smoothly connected between the first curved section 432 and the third curved section 434, and the distance from the connection end of the first curved section 432 to the connection end of the third curved section 434 is gradually increased, the minimum distance is La1, the maximum distance is La2, the distance from the beginning to the end to the center a of the first cam 43, the fourth curved section 435 is smoothly connected between the third curved section 434 and the fifth curved section 436, and the maximum distance from the connection end to the third curved section 433 to the connection end of the fifth curved section 436 is La2, the maximum distance from the connection end to the center a of the first cam 4312 is La3, the maximum distance from the third curved section 435 to the end is La3, the maximum distance from the fifth curved section 435 is gradually increased, and the maximum distance from the first curved section 435 to the end is 43 is gradually increased, and the maximum distance from the fifth curved section to the end is 43: la1 < La2 < La3, whereby the height of the first driving position is lower than the height of the second driving position, the height of the first pushing member 31 raised when the first jack 42 is in the first driving position is smaller than the height of the first pushing member 31 raised when the first jack 42 is in the second driving position, whereby the rotation amplitude of the first half needle pushing foot 32 is smaller, and the positions of the first abutting portions 122 on the first half needle pushing foot 32 are different.

Specifically, as shown in fig. 5a and 5b, when the first curved section 432 and the first ejector rod 42 are located at the first rest position, the first protrusion 421 contacts the first ejector member 31 and makes the first abutting portion 122 located at the lowest position of the first inclined surface 322, and the first middle triangle 12 is located at the full height position.

As shown in fig. 6a and 6b, when the first ejector rod 42 is located at the first driving position in the third curved section 434, the first protrusion 421 lifts the first ejector member 31 and positions the first abutment 122 at the first boss 326, and the first intermediate triangle 12 is located at the half-height position.

As shown in fig. 7a and 7b, when the first ejector rod 42 is in the second driving position in the fifth curved section 436, the first protrusion 421 lifts the first ejector member 31 and positions the first abutting portion 122 in the first groove 327, and the first intermediate triangle 12 is in the full height position.

The second intermediate triangle 22 is driven in a manner substantially identical to that of the first intermediate triangle 12, the second intermediate triangle includes a second pin located at the back surface and penetrating through the second triangle bottom plate, the second pin includes a second abutting portion, the second triangle control mechanism includes a second half-needle pushing foot, the second pin has a structure identical to that of the first pin 121, the second half-needle pushing foot has a structure identical to that of the first half-needle pushing foot 32, and in some embodiments, a side end surface of the second half-needle pushing foot, which is close to the second pin, is provided with a third inclined surface and a second high surface; when the second abutting part is tangent to the third inclined plane or separated from the second inclined plane, the second middle triangle is positioned at the full height position; when the second abutting part is contacted with the second high surface, the second middle triangle is positioned at the half-height position. In other embodiments, the second half-needle pushing leg further includes a fourth inclined plane and a second concave plane, the third inclined plane and the fourth inclined plane are arranged opposite to each other, the second high plane is connected with the highest position of the third inclined plane and the highest position of the fourth inclined plane to form a second boss, the lowest position of the fourth inclined plane is connected with the second concave plane to form a second groove, when the second abutting part is located in the second groove, the second middle triangle is located in the full high position, when the second abutting part is located in the second boss, the second middle triangle is located in the half high position.

Similarly, the initial position of the second half needle pushing foot is a position corresponding to the second abutting part when the second abutting part is tangent to the third inclined plane or separated from the second inclined plane, the second half needle pushing foot is unpowered and needs to act under the action of the second driving component, if the second half needle pushing foot is not directly connected with the second driving component, but force transmission is carried out through contact abutting, when the second driving component leaves the second half needle pushing foot, the second half needle pushing foot needs to be reset, and therefore, a fourth reset spring which enables the second half needle pushing foot to have a trend of returning to the initial position is arranged in the middle of the second half needle pushing foot; similarly, the second middle triangle 22 is also unpowered, when the second half needle pushing foot returns to the initial position or is located in the second groove, the second middle triangle 22 needs to be reset, so a third reset spring is arranged between the second pin and the back surface of the second triangle bottom plate 21, and when the second half needle pushing foot returns to the initial position or the second abutting portion is located in the second groove, the second pin approaches to the back surface of the second triangle bottom plate 21 under the action of the third reset spring, and the second middle triangle 22 is reset to the full height position from the half height position.

The second triangular control mechanism further comprises a second pushing part and a second driving assembly, the second pushing part is arranged on the second half needle pushing foot, the second driving assembly is used for pushing the second pushing part, the second half needle pushing foot is rotationally connected with the second triangular bottom plate, one end of the second half needle pushing foot is linked with the second pin, the other end of the second half needle pushing foot is rotationally connected with the second pushing part, and the second pushing part is in rotational fit with the second driving assembly. The second pushing piece can have the same structure and function as the first pushing piece, and can also be a bearing or a roller.

The structure of the second driving assembly is the same as that of the first driving assembly 4, the second driving assembly comprises a second motor, a second ejector rod and a second cam, the second motor drives the second cam to rotate, the second ejector rod is provided with a second rest position and a third driving position, a second half needle pushing foot is rotationally connected with the second triangle bottom plate 21, one end of the second half needle pushing foot is linked with a second pin, the other end of the second half needle pushing foot is connected with the second pushing foot, the second pushing foot is matched with the second driving assembly, and the second half needle pushing foot is lifted under the action of the second driving assembly to drive the second half needle pushing foot to rotate, so that the second abutting part moves along the end face of the second half needle pushing foot. When the second ejector rod is positioned at the second rest position, the second ejector rod is in contact with the second pushing piece, the second abutting part is tangent to or separated from the first inclined plane, and the second middle triangle is positioned at the full height position; when the second ejector rod is positioned at the third driving position, the second pushing piece is lifted up, the second abutting part is abutted with the second high surface, and the second middle triangle is positioned at the half-high position.

In other embodiments, to correspond to the second groove, the second ejector rod further has a fourth driving position, and the second motor drives the second cam to rotate, so that the second ejector rod further has the fourth driving position, and when the second ejector rod is located in the fourth driving position, the second ejector rod is lifted up and the second abutting portion is located in the second groove.

Specifically, the second cam is in transmission connection with a second output shaft of the second motor, and a second curved slot which can enable the second ejector rod to reach a second rest position, a second driving position and a second driving position is formed in the second cam; the shape of the second curved slot is the same as that of the first curved slot 431, a second chute and a second bulge are arranged on the second ejector rod, the second output shaft passes through the second chute, the second bulge is arranged in the second curved slot, the second motor rotates to enable the second bulge to move along the second curved slot so as to change the relative position of the second bulge and the second output shaft, and the second ejector rod is driven to move among a second rest position, a third driving position and a fourth driving position.

When the second ejector rod is positioned at the second rest position, the second ejector rod is contacted with the second pushing foot, so that the abutting part is positioned at the lowest part of the third inclined plane, and the second middle triangle 22 is positioned at the full height position; when the second ejector rod is positioned at the third driving position, the second pushing leg is lifted up, the abutting part is positioned at the second boss, and the second middle triangle 22 is positioned at the half-height position; when the second ejector rod is positioned at the fourth driving position, the second pushing leg is lifted up, the abutting part is positioned in the second groove, and the second middle triangle 22 is positioned at the full height position.

Based on the head component of the flat knitting machine, the utility model also provides a bidirectional hanging mesh knitting method, which comprises the following steps:

Controlling a first needle lifting triangle 14, a first middle triangle 12 and a second needle lifting triangle 15 in the first guide needle machine head 1 to be at the full-height position, and knitting at least one row of first coil rows in the first surface; simultaneously, the third needle lifting triangle 24, the second middle triangle 22 and the fourth needle lifting triangle 25 in the second guide needle machine head 2 are controlled to be at the full-height position, and at least one row of second stitch rows in the second surface are knitted;

If the first surface is required to perform bidirectional stitch knitting, the first intermediate cam 12 is controlled to be at a half-height position, the first needle lifting cam 14 and the second needle lifting cam 15 are controlled to be at full-height positions, specifically, the first motor 41 in the first driving assembly 4 is controlled to drive the first cam 43 to rotate, the first curved groove 431 rotates to a corresponding curved section relative to the first protrusion 421 on the first ejector rod 42, the first ejector rod 42 is positioned at a first driving position, the first ejector member 31 is lifted up, the first abutting part 122 on the back surface of the first intermediate cam 12 is positioned on the first boss 326 of the first half-needle pushing foot 32, the first intermediate cam 12 moves towards the back surface of the first cam base plate 11 and is at the half-height position;

If the second surface is required to be knitted by two-way lifting, the second middle triangle 22 is controlled to be at a half-height position, the third lifting triangle 24 and the fourth lifting triangle 25 are controlled to be at a full-height position, specifically, the second motor in the second driving assembly is controlled to drive the second cam to rotate, the second curve groove rotates to a corresponding curve section relative to the second bulge on the second ejector rod, the first ejector rod 42 is at a third driving position, the second pushing leg is lifted, the second abutting part on the back surface of the second middle triangle 22 is positioned on the second boss of the first half-needle pushing leg 32, the second middle triangle 22 moves towards the back surface of the second triangle bottom plate 21 and is at the half-height position.

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

1. A head assembly for a flat knitting machine, comprising:

a first guide needle machine head for knitting a first face of the fabric,

2. The handpiece assembly of claim 1 wherein the first and second needle raising cams and the first intermediate cam in the full height position form a first bi-directional needle guide channel of a first face; the first needle lifting triangle, the second needle lifting triangle and the first middle triangle at the half-height position form a second bidirectional needle guide channel of a first surface;

3. The handpiece assembly of claim 1 further comprising a first cam control mechanism at least partially positioned on the back of the first cam base plate and configured to move the first intermediate cam to the half-height position or the full-height position;

The second triangular control mechanism is at least partially positioned on the back surface of the second triangular bottom plate and drives the second middle triangular to move to the half-height position or the full-height position.

4. The handpiece assembly of claim 3 wherein the first and second cam control mechanisms are capable of simultaneously controlling the movement of the first and second intermediate cams to a half-height position or a full-height position, respectively;

5. The head assembly of claim 3, wherein the first intermediate triangle comprises a first pin on the back surface and penetrating the first triangle bottom plate, the first pin comprises a first abutting part, the first triangle control mechanism comprises a first half needle pushing foot, and a first inclined surface and a first high surface are arranged on one side end surface of the first half needle pushing foot close to the first pin;

6. The head assembly of claim 5, wherein the first half needle pushing foot further comprises a second inclined plane and a first concave plane, the first inclined plane and the second inclined plane are arranged opposite to each other, the first high plane is connected with the highest position of the first inclined plane and the highest position of the second inclined plane to form a first boss, the lowest position of the second inclined plane is connected with the first concave plane to form a first groove, the first middle triangle is located at the full high position when the first abutting part is located in the first groove, and the first middle triangle is located at the half high position when the first abutting part is located in the first boss.

7. The head assembly of claim 5 or 6, wherein a first return spring is disposed between the first pin and the back of the first cam base plate to bias the first intermediate cam from the half-height position to the full-height position; and/or

8. The head assembly of claim 5 or 6, wherein the first cam control mechanism further comprises a first pushing member arranged on the first half-needle pushing leg and a first driving assembly for pushing the first pushing member, the first half-needle pushing leg is rotatably connected with the first cam base plate, one end of the first half-needle pushing leg is linked with the first pin, the other end of the first half-needle pushing leg is rotatably connected with the first pushing member, and the first pushing member is rotatably matched with the first driving assembly.

9. The handpiece assembly as in claim 8, wherein,

The first driving component comprises a first motor, a first ejector rod and a first cam, the first motor drives the first cam to rotate, so that the first ejector rod has a first rest position and a first driving position,

10. The head assembly of claim 9, wherein the first motor rotates the first cam such that the first ejector rod further has a second driving position, and wherein when the first ejector rod is in the second driving position, the first ejector member is lifted and the first abutting portion is located in the first groove.

11. The handpiece assembly of claim 10 wherein the handpiece assembly,

The first cam is in transmission connection with a first output shaft of the first motor, and a first curve groove which can enable the first ejector rod to reach the first rest position, the first driving position and the second driving position is formed in the first cam;

12. The handpiece assembly of claim 6 wherein,

The second middle triangle comprises a second pin which is positioned on the back surface and penetrates through the second triangle bottom plate, the second pin comprises a second abutting part, the second triangle control mechanism comprises a second half-needle pushing foot, and a third inclined surface and a second high surface are arranged on the end surface of one side, close to the second pin, of the second half-needle pushing foot;

13. The handpiece assembly as in claim 12, wherein the second half-needle pushing foot further comprises a fourth inclined surface and a second concave surface, the third inclined surface and the fourth inclined surface are disposed opposite to each other, the second high surface is connected with a highest portion of the third inclined surface and a highest portion of the fourth inclined surface to form a second boss, a lowest portion of the fourth inclined surface is connected with the second concave surface to form a second groove, the second middle triangle is located at a full high position when the second abutting portion is located in the second groove, and the second middle triangle is located at a half high position when the second abutting portion is located in the second boss.

14. The head assembly of claim 12, wherein a third return spring is disposed between the second pin and the back of the second cam base plate to bias the second intermediate cam from the half-height position to the full-height position; and/or

15. The head assembly of claim 12, wherein the second cam control mechanism further comprises a second pushing member arranged on the second half-needle pushing leg and a second driving assembly for pushing the second pushing member, the second half-needle pushing leg is rotatably connected with the second cam base plate, one end of the second half-needle pushing leg is linked with the second pin, the other end of the second half-needle pushing leg is rotatably connected with the second pushing member, and the second pushing member is rotatably matched with the second driving assembly.

16. The head assembly of claim 15, wherein the second drive assembly includes a second motor, a second ram, and a second cam, the second motor rotating the second cam such that the second ram has a second rest position and a third drive position,

17. The head assembly of claim 16, wherein the second motor rotates the second cam such that the second ejector rod further has a fourth driving position, and wherein when the second ejector rod is in the fourth driving position, the second ejector member is lifted and the second abutting portion is located in the second groove.

18. The head assembly of claim 17, wherein said second cam is drivingly connected to a second output shaft of said second motor, said second cam having second curved slots for enabling said second ram to reach said second rest position, said third drive position and said fourth drive position;