CN112064235A - Thread quantity self-adaptive thread hooking device of embroidery machine - Google Patents

Abstract

The invention relates to the technical field of embroidery machine equipment, in particular to a thread amount self-adaptive thread hooking device of an embroidery machine, which comprises a support base plate, a thread hooking knife arranged on the support base plate, a lower shifting fork used for driving the thread hooking knife to move back and forth and a lower shifting fork driving assembly used for driving the lower shifting fork to swing back and forth, wherein the lower shifting fork is sleeved on a positioning shaft arranged on the support base plate, and the lower shifting fork driving assembly comprises: the middle transition shifting fork is sleeved on the positioning shaft; the upper shifting fork is used for driving the middle transition shifting fork to swing back and forth between the front and the rear and is also sleeved on the positioning shaft; an upper driving torsion spring is arranged between the upper shifting fork and the middle transition shifting fork; the middle transition shifting fork and the lower driving torsion spring arranged between the lower shifting forks optimize the wire hooking action and have better wire shearing effect.

Description

Thread quantity self-adaptive thread hooking device of embroidery machine

Technical Field

The invention relates to the technical field of embroidery machine equipment, in particular to a thread quantity self-adaptive thread hooking device of an embroidery machine.

Background

The existing embroidery machines are various in types, but most embroidery machines need to be provided with corresponding thread hooking devices, because when an embroidery product finishes one graphic unit and begins to embroider another graphic unit or changes colors, thread cutting treatment needs to be carried out on upper threads and bottom threads below an embroidery material, mechanical structures such as a thread hooking knife, a thread hooking pull rod device for driving the thread hooking knife and the like are needed in the thread cutting process, and the thread hooking devices are needed to hook threads to well finish the thread cutting process.

The Chinese patent with the application number of 02239633.0 discloses a collective thread hooking mechanism of a multi-head computerized embroidery machine, wherein each group of thread hooking mechanisms is provided with a cam, the cam is hinged with a thread hooking driving rod, a fixed rotating shaft is arranged in the middle of the thread hooking driving rod, two pushing and blocking clamping blocks are arranged on a thread hooking pull rod at intervals, a spring is arranged between the two pushing and blocking clamping blocks, the thread hooking pull rod between the two pushing and blocking clamping blocks passes through the pushing and blocking blocks and is in clearance fit with the pushing and blocking blocks, the pushing and blocking blocks are hinged with one end of an L-shaped shifting fork, a shifting fork end of the shifting fork with the fixed rotating shaft is arranged at the L-shaped corner of the shifting fork, a thread hooking shaft is connected with a thread hooking frame, and a fixed thread hook is arranged on;

also, as the chinese patent with application number 02207245.4, a collective thread hooking mechanism for computerized embroidery machines used in textile and clothing industries is disclosed, in which each thread hooking mechanism is provided with a thread hooking and engaging and disengaging device, and a torsion spring is installed between a crank and a shifting fork, when a certain one or more thread hooking mechanisms do not need to work, only an engaging pin needs to be extended to limit the shifting swing of the one or more thread hooking mechanisms, and the crank can still swing normally, so that the thread hooks of each thread hooking mechanism can be opened and closed independently without affecting the normal work of other thread hooking mechanisms.

The existing thread hooking devices can effectively complete thread hooking processes, but the problems of thread breakage and the like in the thread head feeding process and the thread hooking process of a product still occur in the actual production process, and the product quality and the production efficiency are greatly influenced.

Particularly, as disclosed in chinese patent application No. 202010098291.8, a trimming control method and apparatus for controlling the length of an upper thread end of an embroidery machine, which belongs to the technical field of embroidery machines, the method includes step S01, controlling a rotating shuttle to drive an upper thread to rotate, and controlling a thread take-up holder to hang the upper thread coming out of the rotating shuttle on the thread take-up holder, so as to hold the upper thread; step S02, controlling the moving stroke of the frame with embroidery material according to the required thread cutting length of the upper thread to obtain thread ends of the upper thread with different lengths; step S03, controlling the thread cutting movable knife to hook the bottom thread and the upper thread to the position of the coiling bottom thread and the upper thread; step S04, controlling the frame with embroidery material to move to the original position; and step S05, controlling the thread cutter to cut the bottom thread and the upper thread, wherein the device is realized according to the method, the patent only utilizes the hook cutter to hook the upper thread end based on the existing embroidery machine structure, the thread cutting length is controlled by controlling the stroke of the embroidery material frame, and the consistency of the length of the upper thread end after thread cutting is high. In this conventional design, the operation of upper thread trimming is controlled by controlling the movement of the embroidery frame, and although the capability of controlling the length uniformity is improved, the control of the length of the thread end after trimming, the tightening of the knot, the trimming quality, and the like is not yet optimized.

Disclosure of Invention

The invention aims to provide a thread quantity self-adaptive thread hooking device of an embroidery machine, which has more optimized thread hooking action and better thread cutting effect.

The technical purpose of the invention is realized by the following technical scheme: a thread amount self-adaptive thread hooking device of an embroidery machine comprises a support base plate, a thread hooking knife, a lower shifting fork and a lower shifting fork driving assembly, wherein the thread hooking knife is installed on the support base plate, the lower shifting fork is used for driving the thread hooking knife to move back and forth, the lower shifting fork driving assembly is used for driving the lower shifting fork to swing back and forth, the lower shifting fork is sleeved on a positioning shaft installed on the support base plate, and the lower shifting fork driving assembly comprises: the middle transition shifting fork is sleeved on the positioning shaft;

the upper shifting fork is used for driving the middle transition shifting fork to swing back and forth between the front and the rear and is also sleeved on the positioning shaft;

an upper driving torsion spring is arranged between the upper shifting fork and the middle transition shifting fork;

the middle transition shifting fork and the lower driving torsion spring arranged between the lower shifting forks.

Preferably, a rear limiting portion limiting the rear side of the lower shifting fork and abutting against the lower shifting fork is fixed to the intermediate transition shifting fork.

Preferably, the rear stopper is a rear fender integrally connected to the intermediate transition fork and extending downward and located at a rear side of a portion of the lower fork abutted by the lower fork.

Preferably, the bracket base plate is provided with a locking pin which can move up and down and is used for locking the middle transition shifting fork and/or the lower shifting fork, and the middle transition shifting fork and/or the lower shifting fork are/is provided with a lower locking hole into which the locking pin is inserted upwards.

Preferably, the rear limiting part is a cylindrical driving block extending downwards and integrally connected with the middle transition shifting fork, and the lower shifting fork is provided with a driving groove for the cylindrical driving block to be inserted downwards.

Preferably, the driving slot is an arc-shaped slot.

Preferably, the bracket base plate is provided with a locking pin which can move up and down and is used for locking the middle transition shifting fork, and the cylindrical driving block is upwards provided with a middle locking hole along the lower surface for the locking pin to be upwards inserted.

Preferably, a front limiting part which limits the front side of the middle transition shifting fork and can abut against the middle transition shifting fork is fixed on the upper shifting fork.

Preferably, the front limiting part is a front baffle plate integrally connected to the upper fork and extending downwards, and is located on the front side of a part, abutted by the middle transition fork, of the middle transition fork.

Preferably, the upper driving torsion spring and the lower driving torsion spring are both single torsion springs, two torsion spring arms of the upper driving torsion spring are respectively supported on the upper shifting fork and the middle transition shifting fork, and two torsion spring arms of the lower driving torsion spring are respectively supported on the middle transition shifting fork and the lower shifting fork.

Preferably, the coil portion of the upper driving torsion spring and the coil portion of the lower driving torsion spring are wound around the positioning shaft.

Preferably, the torsion force of the lower driving torsion spring is smaller than that of the upper driving torsion spring.

The invention has the beneficial effects that: 1. the thread quantity of the thread hooking device can be adjusted according to the actual working condition in the thread hooking process, and a better self-adaptive process is realized;

2. particularly, when the control device is applied to equipment for controlling the thread trimming length by controlling the stroke of the embroidery frame, the thread end length is effectively controlled, and the tightening of the thread knot is more stable;

3. the occurrence probability of broken threads, broken threads and the like is reduced;

4. the failure rate of the equipment may decrease;

5. the production efficiency is obviously improved;

6. the quality of the embroidery is improved.

Drawings

Fig. 1 is a schematic perspective view of a rear-upper view of one type of the thread hooking device in embodiment 1;

FIG. 2 is a perspective view of the structure of FIG. 1 from an upper right perspective;

FIG. 3 is a perspective view of the front side of the structure of FIG. 1;

FIG. 4 is a perspective view of the structure of FIG. 1 from a front top perspective;

FIG. 5 is a perspective view of a rear right view of another embodiment of the thread hooking device of the embodiment 2;

FIG. 6 is a perspective view of the structure of FIG. 5 from a rear upper perspective;

fig. 7 is a perspective view of the structure of fig. 5 from a front lower perspective.

In the figure, 1, a bracket base plate, g, a wire hooking knife, x, a lower shifting fork, 2, a positioning shaft, y, a middle transition shifting fork, z, an upper shifting fork, n, an upper driving torsion spring, t2, a lower driving torsion spring, t1, a rear baffle, s, a locking pin, x0, a lower locking hole, tt, a cylindrical driving block, d3, a driving groove, d20, a middle locking hole, z1, a front baffle, nn and a torsion spring arm.

Detailed Description

The following specific examples are given by way of illustration only and not by way of limitation, and it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made in the examples without inventive faculty, and yet still be protected by the scope of the claims.

Embodiment 1, as shown in fig. 1 to 7, a thread amount adaptive thread hooking device for an embroidery machine comprises a bracket base plate 1, a thread hooking knife g mounted on the bracket base plate 1, a lower fork x for driving the thread hooking knife g to move back and forth, and a lower fork driving assembly for driving the lower fork x to swing back and forth, wherein the base part of the entire device of the bracket base plate 1 carries and mounts various parts, of course, the bracket base plate 1 itself needs to be mounted on a supporting structure in a head of the embroidery machine, so that some mounting holes need to be opened, which is a conventional structure and will not be described in detail herein, and in addition, after the bracket base plate 1 is mounted on the embroidery machine, it is generally preferable that the bracket base plate is inclined forward and downward, and the entire thread hooking device is also inclined forward and downward after being mounted, the thread hooking knife g also extends forwards and obliquely downwards to hook threads, retreats backwards and obliquely upwards to return to the original position, the embroidery frame is positioned in the area below the thread hooking device, after a needle with a facial suture is inserted downwards for a plurality of times on the embroidery and before thread cutting, the thread hooking knife can extend forwards to hook the threads, and the thread hooking knife returns after the thread cutting. The thread hooking knife g is a linear moving mode, but a lower shifting fork x for driving the thread hooking knife g to move is a swinging structure, namely the lower shifting fork x is driven in a mode of rotating around a shaft, so that the design can be made, the lower shifting fork x is sleeved on a positioning shaft 2 arranged on the support base plate 1, the lower shifting fork x swings around the positioning shaft 2 in a section of area between the front and the back, the positioning shaft 2 and the thread hooking knife g are respectively positioned at the positions, close to two end parts, of the lower shifting fork x, the positioning shaft 2 is positioned on the left side, and the thread hooking knife g is positioned on the right side, so that the function of the shifting fork can be exerted. In addition, specifically, the bracket base plate 1 is required to be provided with a linear guide groove g0 for guiding the thread hooking knife g linearly forward and backward, generally a linear guide plate gg extending forward and backward and having an inverted U-shaped structure is adopted and installed on the upper surface of the bracket base plate 1, the U-shaped groove of the linear guide plate gg is a channel for the thread hooking knife g to travel forward and backward, the linear guide groove g0 is opened on the upper portion of the linear guide plate gg and communicated with the U-shaped groove thereof, an upward extending guide post g1 is fixed on the upper surface of the thread hooking knife g, the guide post g1 passes upward through the linear guide groove g0, the diameter of the guide post g1 is as consistent as possible with the left and right width of the linear guide groove g0, so that the linear guide of the guide post g1 is more accurate, the lower fork x is provided with a guide driving groove g2 for the guide post g1 to continuously insert upward, and the guide driving groove g2 is a strip-shaped groove and preferably opened along the radial direction of the positioning shaft 2 and extends in the left and right direction And the dimension between the front and the rear is consistent with that of the guide post g1, the guide driving groove g2 is positioned at the upper side of the linear guide groove g0 and is in a cross shape, so that the swing of the lower fork x between the front and the rear is converted into the linear motion of the front and the rear travel of the thread hooking knife g.

The foregoing are some of the basic components. Further, the lower fork drive assembly includes: the middle transition shifting fork y is sleeved on the positioning shaft 2;

the upper shifting fork z is used for driving the middle transition shifting fork y to swing back and forth between the front and the back and is also sleeved on the positioning shaft 2;

an upper driving torsion spring n is arranged between the upper shifting fork z and the middle transition shifting fork y;

and a lower driving torsion spring t2 is arranged between the middle transition shifting fork y and the lower shifting fork x.

The lower shifting fork x and the middle transition shifting fork y can both adopt structures extending in the left-right direction, the lower shifting fork x is located in a region below the middle transition shifting fork y, the middle transition shifting fork y is located in a region below the upper shifting fork z, the upper shifting fork z adopts an existing L-shaped structure, the upper shifting fork z comprises two integrally connected parts, a first part s1 extending forwards and backwards and a second part s2 extending rightwards and integrally connected with the front end of the first part s1 are generally adopted, the first part s1 and the second part s2 are generally vertical, and the vertical connection part of the first part s1 and the second part s2 is sleeved on the positioning shaft 2. A linkage post s3 is fixed on the first portion s1, and the linkage post s3 is used for controlling the thread hooking devices together, that is, the linkage post s3 of the thread hooking device on the embroidery machine is connected in series through a movable connecting rod to move, so that the first portion s1 is shifted, in this embodiment, the first portion s1 is shifted to the right when the device is used for hooking threads, and the second portion s2 swings forward, so that the middle transition shifting fork y can swing forward after being driven by the elastic force of the upper driving torsion spring n under the driving of the first portion s1, and then the lower shifting fork x can drive the hook knife to extend forward to hook threads through the design of the lower driving torsion spring t 2.

The structure is the most characteristic part in the application, the middle transition shifting fork y is used as a bridge between the upper part and the lower part and is used as a transition connection point of the upper torsion spring and the lower torsion spring, the upper driving torsion spring n can enable the upper shifting fork z to drive the middle transition shifting fork y to swing back and forth by utilizing the torsion force of the torsion spring, the lower driving torsion spring t2 not only can make the middle transition shifting fork y drive the lower shifting fork x to swing back and forth by means of torsion force, but also more importantly, after the lower shifting fork x is driven to make the thread hooking knife g hook the surface thread, during the length adjustment of the upper thread, the device can form better elastic force to ensure that the upper thread is always pulled by an elastic force, the advantages of preventing the damage and even the breakage of the upper thread caused by the force when the upper thread is pushed, having better buffer function, and a better stretching elasticity is always provided in the upper thread adjusting process, so that the upper thread is not loosened.

As mentioned in the background art, chinese patent application No. 202010098291.8 discloses a trimming control method and device for controlling the length of an upper thread end of an embroidery machine, which includes: the length of the thread end of the required upper thread end is controlled by controlling the moving stroke of the frame with the embroidery material without changing the structure of the existing embroidery machine, and the length adjustment of the upper thread end can be carried out adaptively according to the embroidery requirements and the embroidery materials with different materials and thicknesses and the embroidery materials with different densities and thicknesses; in addition, the lengths of the upper threads below the multiple machine heads are uniformly adjusted by utilizing the moving stroke of the frame with the embroidery material, compared with a method for hooking the lengths of the upper threads by utilizing the hooking knives corresponding to the multiple machine heads, the lengths of the upper thread ends after thread cutting are better in consistency, and the quality of the embroidery is greatly improved. Mention is also made of: in step S01, the spindle is controlled to drive the rotating shuttle to hook and rotate the upper thread, and the thread-retaining device is controlled to approach the rotating shuttle to intercept the upper thread, so that the upper thread coming out of the rotating shuttle is hung on the thread-retaining device to form and retain the state of the coil. The upper thread hung on the thread-fastening retainer is a triangle-like coil, and the bottom thread is positioned in the middle of the triangle-like coil. The coil can be divided into a left side waist line segment, a right side waist line segment and a bottom side line segment. The upper thread can be divided into a left side waist thread segment which can be hooked by the thread cutter and is to be cut off and a right side waist thread segment which can be hooked by the hook cutter and is sent to the upper thread clamp by the hook cutter, so that the upper thread can be effectively cut off, and the influence on the next graphic unit embroidery caused by the wrong cutting can be avoided. And because the bottom line is positioned in the middle of the triangular coil, the upper line and the bottom line can be clearly distinguished, and the upper line and the bottom line can be conveniently and accurately cut off. In the process, the thread length is controlled by the moving stroke of the embroidery frame, but when the embroidery frame returns, the thread loosening can be caused, the middle part of the tightened embroidery can float, not only the thread length needs to be more, but also the fit between the embroidery frame and the needle plate is not enough, the problems of thread length, thread knot loosening and the like can be caused, and the newly designed thread hooking structure in the implementation can ensure that the moving stroke of the embroidery frame can control the thread end length of the required thread end of the upper thread, the upper thread always has certain elastic tension and cannot loosen, the thread length can be reduced, the thread knot is also more tightly attached to the bottom of the embroidery frame, the main reason is that the upper thread is always in a tension state, the embroidery can be in a more smooth working condition, the thread knot can be more tightly folded, the thread end is not easy to loosen and fall off, and the use of the thread amount can be reduced.

In order to cooperate with the effective implementation of the structure, the specific structural design of the torsion spring is as follows: the upper driving torsion spring n and the lower driving torsion spring t2 are both single torsion springs, and two torsion spring arms nn of the upper driving torsion spring n are respectively supported on the upper shifting fork z and the middle transition shifting fork y. The torsion spring arms nn of the upper drive torsion spring n can be directly inserted into the corresponding fork, or can be supported against one side of the corresponding fork, which can always form an abutting force, for example, one of the torsion spring arms nn of the upper drive torsion spring n is supported against the right side portion of the first portion s1, and the other is inserted downward from the upper surface of the middle transition fork y.

And the two torsion spring arms nn of the lower driving torsion spring t2 are supported on the intermediate transition fork y and the lower fork x, respectively. The mounting is referred to the method of upper drive torsion spring n, for example, in torsion spring arm nn of lower drive torsion spring t2, one inserted upward from the lower surface of middle transition fork y and the other supported against the front flank portion of lower fork x.

The coil part of the upper driving torsion spring n and the coil part of the lower driving torsion spring t2 are both wound around the periphery of the positioning shaft 2. In order to better realize the scheme, the part of the joint of the first part s1 and the second part s2, which is sleeved on the positioning shaft, is downward integrally connected to form an upper shaft sleeve w1 sleeved on the positioning shaft 2, the coil of the upper driving torsion spring n is directly sleeved on the upper shaft sleeve w1, and the upper shaft sleeve w1 has a positioning function on the coil part of the upper driving torsion spring n, and can also prevent the coil part of the upper driving torsion spring n from being crushed up and down by the upper shifting fork z and the middle transition shifting fork y. Similarly, the part of the middle transition shifting fork y sleeved on the positioning shaft is downwards integrally connected to form a lower shaft sleeve w2 sleeved on the positioning shaft 2.

Preferably, the torsion force of the lower driving torsion spring t2 is smaller than that of the upper driving torsion spring n, which means that the elastic force is formed by the same deformation, in a simple embodiment, the upper driving torsion spring n can be a slightly thicker torsion spring, and the lower driving torsion spring t2 can be a slightly more attractive torsion spring, but the winding sizes of the torsion springs are almost equal, so as to ensure the stability of the upper driving and the stability of the lower side thread adaptation process. Of course, this design works better with the preferred configuration of embodiments 2 and 3.

By the cooperation of the above-mentioned structures, the lower driving torsion spring t2 can exert the pulling elasticity control of the upper thread better.

Embodiment 2, the figure refers to embodiment 1, is a further improvement of embodiment 1, fixed on the upper fork z is the front limit part which limits the front side of the middle transition fork y and can abut against the middle transition fork y.

The front limit part is a front baffle plate z1 which extends downwards and is integrally connected to the upper shifting fork z and is positioned at the front side of the part of the middle transition shifting fork y abutted by the middle transition shifting fork y.

The limiting reduction of the front side is realized by the fact that the middle transition shifting fork y is influenced by the upper line in the adjusting process, and only the lower driving torsion spring t2 on the lower side is independently adjusted, so that the effectiveness of the structure is guaranteed.

Embodiment 3, referring to embodiment 1, the drawings show a further improvement of embodiments 1 and 2, in which a rear stopper portion for stopping the rear side of the lower fork x and abutting against the lower fork x is fixed to the intermediate transition fork y.

The back spacing part of lower shift fork x makes lower shift fork x can more do benefit to and is promoted forward the moving ahead that realizes colluding the sword, wherein certain thread hooking device goes wrong needs maintenance etc. in the frame, can not influence other thread hooking device's normal use, because as long as lock down shift fork x or directly lock middle transition shift fork y and can both accomplish the fixed of middle transition shift fork y, thereby it can also follow other thread hooking device and rotate to go up shift fork z, but the structure below the middle transition shift fork y among this thread hooking device just can not have operated.

Specific structural style this embodiment recommends two types:

first, the rear stopper is integrally connected to a rear fence t1 extending downward on the intermediate transition fork y and at the rear side of the portion of the lower fork x against which it is abutted.

The bracket base plate 1 is provided with a locking pin s which can move up and down and is used for locking the middle transition shifting fork y and/or the lower shifting fork x, and the middle transition shifting fork y and/or the lower shifting fork x are provided with a lower locking hole x0 for the locking pin s to be inserted upwards.

Secondly, the rear limiting part is a cylindrical driving block tt which is integrally connected with the middle transition shifting fork y and extends downwards, and a driving groove d3 for the cylindrical driving block tt to insert downwards is formed in the lower shifting fork x.

The driving groove d3 is an arc-shaped groove. Further, the driving groove d3 can be optimized to be concentric with the positioning shaft 2, compatibility of mechanical equipment is improved, certainly, the cylindrical driving block tt can have a small swing interval in the driving groove d3, using effect is improved, and the cylindrical driving block tt is preferably attached to the front end of the driving groove d3 or directly attached to the front end of the driving groove d3 in an initial state, so that the elastic self-adaptive adjustment of hook line extension and process control line adjustment is facilitated.

A locking pin s which can move up and down and is used for locking the middle transition shifting fork y is installed on the bracket base plate 1, and a middle locking hole d20 for the locking pin s to be inserted upwards is formed in the cylindrical driving block tt along the lower surface of the cylindrical driving block tt upwards.

The pattern of above-mentioned two kinds of structures can let the device of colluding not only can drive the operation of colluding the sword around more smooth, also can guarantee alone collude when the device goes wrong, do not influence the operation of whole embroidery machine.

The operation of colluding the traditional thread binding putting is also convenient, and the shift fork effect makes the eave tile carry out the line that colludes forward in the drive, then stops and goes up the shift fork, and the embroidery material frame removes adjustment facial suture, colludes the traditional thread binding putting at this in-process and is just elasticity self-adaptation adjustment, cuts the traditional thread binding putting and prepares for a moment, and the embroidery material frame rolls back and cuts the line, and the in-process can form the knot, and after this the eave tile rolls back can.

In addition, the integrated connection that this application mentioned can adopt modes such as integrated into one piece or welding to realize, if fixed integrated connection, can also adopt modes such as other bolt fixings to realize.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (11)

1. The utility model provides a quantity of thread self-adaptation of embroidery machine colludes traditional thread binding putting which characterized in that: the wire hooking device comprises a support base plate (1), a wire hooking knife (g) arranged on the support base plate (1), a lower shifting fork (x) used for driving the wire hooking knife (g) to move back and forth, and a lower shifting fork driving assembly used for driving the lower shifting fork (x) to swing back and forth, wherein the lower shifting fork (x) is sleeved on a positioning shaft (2) arranged on the support base plate (1), and the lower shifting fork driving assembly comprises: a middle transition shifting fork (y) sleeved on the positioning shaft (2);

the upper shifting fork (z) is used for driving the middle transition shifting fork (y) to swing back and forth between the front and the back and is also sleeved on the positioning shaft (2);

an upper driving torsion spring (n) is arranged between the upper shifting fork (z) and the middle transition shifting fork (y);

and a lower driving torsion spring (t 2) is arranged between the middle transition shifting fork (y) and the lower shifting fork (x).

2. The thread amount adaptive hooking device of an embroidering machine according to claim 1, wherein: and a rear limiting part which is used for limiting the rear side of the lower shifting fork (x) and can be abutted against the lower shifting fork (x) is fixed on the middle transition shifting fork (y).

3. The thread amount adaptive hooking device of an embroidering machine according to claim 2, wherein: the rear stopper is integrally connected to a tailgate (t 1) extending downward on the intermediate transition fork (y) and located at the rear side of a portion against which the lower fork (x) is abutted.

4. The thread amount adaptive hooking device of an embroidering machine according to claim 3, wherein: the support base plate (1) is provided with a locking pin(s) which can move up and down and is used for locking the middle transition shifting fork (y) and/or the lower shifting fork (x), and a lower locking hole (x 0) for the locking pin(s) to be inserted upwards is formed in the middle transition shifting fork (y) and/or the lower shifting fork (x).

5. The thread amount adaptive hooking device of an embroidering machine according to claim 2, wherein: the rear limiting part is a cylindrical driving block (tt) which is integrally connected with the middle transition shifting fork (y) and extends downwards, and a driving groove (d 3) for the cylindrical driving block (tt) to insert downwards is formed in the lower shifting fork (x).

6. The thread amount adaptive hooking device of an embroidering machine according to claim 5, wherein: the driving groove (d 3) is an arc-shaped groove.

7. The thread amount adaptive hooking device of an embroidering machine according to claim 5, wherein: the bracket base plate (1) is provided with a locking pin(s) which can move up and down and is used for locking the middle transition shifting fork (y), and the cylindrical driving block (tt) is upwards provided with a middle locking hole (d 20) along the lower surface for the locking pin(s) to be upwards inserted.

8. The thread amount adaptive hooking device of an embroidering machine according to claim 1 or 2, wherein: the upper shifting fork (z) is fixedly provided with a front limiting part which is used for limiting the front side of the middle transition shifting fork (y) and can be abutted against the middle transition shifting fork (y).

9. The thread amount adaptive hooking device of an embroidering machine according to claim 8, wherein: the front limiting part is a front baffle plate (z 1) which extends downwards and is integrally connected to the upper shifting fork (z) and is positioned on the front side of the part, abutted against the middle transition shifting fork (y), of the middle transition shifting fork.

10. The thread amount adaptive hooking device of an embroidering machine according to claim 1, wherein: go up drive torsional spring (n) with lower drive torsional spring (t 2) is single torsional spring, two torsion spring arms (nn) of going up drive torsional spring (n) support respectively go up shift fork (z) with on middle transition shift fork (y), two torsion spring arms (nn) of lower drive torsional spring (t 2) support respectively middle transition shift fork (y) with on lower shift fork (x).

11. The thread amount adaptive hooking device of an embroidering machine according to claim 10, wherein the coil part of the upper driving torsion spring (n) and the coil part of the lower driving torsion spring (t 2) are wound around the periphery of the positioning shaft (2).

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