CN219260433U - Auxiliary device for cutting and lifting chain stitch and chain stitch machine - Google Patents

Abstract

The utility model provides a chain seam shearing and seam lifting auxiliary device and a chain seam machine, wherein the chain seam machine comprises a curved needle, a cam wire hook assembly and a wire bonding cam, a bottom wire is arranged on the cam wire hook assembly and the curved needle in a penetrating manner, and the wire bonding cam is used for penetrating the bottom wire arranged on the cam wire hook assembly; the wire clamping assembly is arranged between the curved needle and the cam wire hook assembly and used for clamping a bottom wire between the curved needle and the cam wire hook assembly. The utility model is provided with a thread clamping assembly which is arranged between the curved needle and the cam wire hook assembly and is used for clamping the bottom thread between the curved needle and the cam wire hook assembly. Because the bottom line between curved needle and the cam wire hook component is clamped by the wire clamping component, the wire bonding cam wire bonding can only bond wires from one side of the cam wire hook component, the bottom line ring can be ensured to be rapidly expanded, the needle can be more easily penetrated into the bottom line ring when descending, then the upper line is tightened, and the probability that the bottom line is not on the seam tape is reduced.

Description

Auxiliary device for cutting and lifting chain stitch and chain stitch machine

Technical Field

The utility model relates to the technical field of chain stitch machine sewing equipment, in particular to a chain stitch trimming and lifting auxiliary device and a chain stitch machine.

Background

With the development of sewing machine technology, in order to reduce the labor intensity of operators and improve the production efficiency, more and more sewing machines are equipped with an automatic thread cutting function. Based on the automation requirement of the sewing machine, a plurality of automatic thread cutting technologies exist in the field of chain lockstitch sewing machines. At present, in many chain type flat seaming machine thread cutting technologies, after thread cutting, a bottom thread head can be clamped to prevent a seam lifting bottom thread from being taken off, and an auxiliary device is arranged on a bottom thread track and used for compensating thread quantity required by thread cutting and seam lifting thread bonding cam thread bonding. However, as the bottom thread is clamped, after the stitching, the loopers are retracted to form the bottom thread loop, and the thread quantity forming the bottom thread loop is easily drawn away by the thread bonding cams, so that the loop cannot be effectively enlarged, the bottom thread loop cannot be penetrated by a machine needle at a certain probability, a chain stitch cannot be formed, the problem that the stitching belt does not go on the bottom thread occurs, unnecessary work of operators is increased, and the production efficiency is seriously affected.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present utility model is to provide a seam trimming and seam lifting auxiliary device and a seam machine, which are used for solving the problems that in the prior art, when the seam machine lifts a seam, a bottom thread head is clamped by a thread clamping piece, and when a wire bonding cam is used for bonding, the wire quantity of a bottom thread loop is drawn away, so that a machine needle is possibly not inserted into the bottom thread loop, and the seam lifting belt is not lifted.

In order to achieve the above purpose, the utility model provides a chain stitch thread cutting and lifting auxiliary device which is applied to a chain stitch machine, wherein the chain stitch machine comprises a curved needle, a cam wire hook component and a routing cam, a bottom thread is arranged on the cam wire hook component and the curved needle in a penetrating way, and the routing cam is used for routing the bottom thread arranged on the cam wire hook component in a penetrating way; the wire clamping assembly is arranged between the curved needle and the cam wire hook assembly and used for clamping a bottom wire between the curved needle and the cam wire hook assembly.

Preferably, the thread clamping assembly comprises a thread clamping base, a thread clamping device, a thread clamping fixing part and a thread clamping movable part, wherein the thread clamping base is fixedly connected with the chain stitch machine, the thread clamping device comprises a thread clamping device fixing shell and a thread clamping device telescopic piece, the thread clamping device fixing shell is connected with the thread clamping fixing part, and the thread clamping device telescopic piece is connected with the thread clamping movable part; the bottom wire is arranged between the wire clamping fixing part and the wire clamping movable part in a penetrating way.

Preferably, the wire clamp is an electromagnet.

Preferably, the chain stitch machine further comprises a main shaft and a control unit for detecting the rotation angle of the main shaft, and the control unit is in communication connection with the thread clamp.

In order to achieve the above purpose or other purposes, the utility model also discloses a chain stitch machine, which adopts the chain stitch thread shearing and starting auxiliary device and also comprises a machine needle, wherein the machine needle is provided with an organic needle hole, and an upper thread is penetrated in the machine needle hole; the curved needle is provided with a curved needle hole, the bottom thread is arranged on the curved needle hole in a penetrating mode, and the upper thread and the bottom thread form a chain stitch.

Preferably, the chain stitch machine further comprises a machine shell and a bottom plate, wherein the machine shell is fixed on the top surface of the bottom plate, the machine needle can be arranged in the machine shell in an up-and-down moving mode, and the thread clamping assembly is fixed inside the bottom plate.

Preferably, the chain stitch machine further comprises a thread cutting mechanism, and the thread cutting mechanism is arranged on the outer side surface of the machine needle; the thread cutting mechanism comprises a thread cutting driving assembly, a transmission assembly, a thread cutting moving blade, a thread cutting fixed blade and a thread cutting compacting assembly, wherein the thread cutting driving assembly is connected with the thread cutting moving blade through the transmission assembly, the thread cutting moving blade is arranged at the lower side of the thread cutting fixed blade, and when the thread cutting moving blade hooks an upper thread and a bottom thread, the thread cutting moving blade is abutted with the thread cutting fixed blade to cut the thread; the thread cutting and compacting assembly is used for providing compacting force between the thread cutting movable cutter and the thread cutting fixed cutter and clamping the bottom thread head after thread cutting.

As described above, the auxiliary device for trimming and lifting the chain stitch and the chain stitch machine have the following beneficial effects:

the utility model relates to a chain stitch thread cutting and lifting auxiliary device and a chain stitch machine, which are provided with thread clamping assemblies, wherein the thread clamping assemblies are arranged between a curved needle and a cam wire hook assembly and are used for clamping a bottom thread between the curved needle and the cam wire hook assembly. When the bottom line between the curved needle and the cam wire hook component is clamped by the wire clamping component, the curved needle retreats, the needle descends to penetrate into the bottom line ring, and the wire-bonding cam wire bonding is performed, so that the wire bonding cam wire bonding can only perform wire bonding from one side of the cam wire hook component, the wire quantity of the bottom line ring cannot be drawn away, the bottom line ring can be ensured to be rapidly expanded, the needle descends to penetrate into the bottom line ring more easily, then the upper line is tightened, a wire knot is formed between the upper line and the bottom line ring, along with the progress of sewing, chain type wire traces are formed between the upper line and the bottom line, and the probability that the bottom line cannot be arranged on a seam tape is reduced.

Drawings

FIG. 1 is a schematic view of a chain stitch machine in accordance with the present utility model;

FIG. 2 is a schematic view of the chain stitch scissors seam assist device of the present utility model;

FIG. 3 is a schematic view showing the state of the upper thread and the lower thread after the thread is cut and the seam is lifted to the upper needle stop position for the first time;

fig. 4 is a schematic operation view of the auxiliary device for chain stitch trimming and stitch lifting according to the present utility model.

Reference numerals illustrate:

1. a cam wire hook assembly; 2. a wire bonding cam; 3. a wire clamping assembly; 31. a wire clamping base; 32. a wire clip; 33. a wire clamping fixing part; 34. a wire clamping movable part; 4. a needle; 5. a curved needle; 6. a thread cutting mechanism; 7. a housing; 8. a bottom plate; 9. an upper thread; 10. and (5) a bottom line.

Detailed Description

Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or adjustments of the sizes, which are otherwise, used in the practice of the utility model, are included in the spirit and scope of the utility model which is otherwise, without departing from the spirit or scope thereof. Also, the terms such as "upper", "lower", "left", "right", "middle", etc. are used herein for convenience of description, but are not to be construed as limiting the scope of the utility model, and the relative changes or modifications are not to be construed as essential to the scope of the utility model.

The utility model provides a chain stitch trimming and lifting auxiliary device which is applied to a chain stitch machine, and for convenience of description, as shown in fig. 1, the length direction of the chain stitch machine is the left-right direction (namely, the X direction of a space coordinate system), the width direction of the chain stitch machine is the front-back direction (namely, the Y direction of the space coordinate system), and the height direction of the chain stitch machine is the up-down direction (namely, the Z direction of the space coordinate system).

As shown in fig. 1-3, the utility model provides a chain stitch trimming and lifting auxiliary device which is applied to a chain stitch machine; the chain stitch machine comprises a curved needle 5, a cam wire hook component 1 and a routing cam 2, wherein a base wire 10 is arranged on the cam wire hook component 1 and the curved needle 5 in a penetrating way, and the routing cam 2 is used for routing the base wire 10 arranged on the cam wire hook component 1 in a penetrating way; the auxiliary device for chain stitch trimming and seam lifting comprises a thread clamping assembly 3, wherein the thread clamping assembly 3 is arranged between a curved needle 5 and a cam wire hook assembly 1 and is used for clamping a bottom thread 10 between the curved needle 5 and the cam wire hook assembly 1.

According to the auxiliary device for chain stitch trimming and seam lifting, when the curved needle 5 retreats to form the bottom line ring, the wire bonding cam 2 is used for bonding to easily draw the wire quantity forming the bottom line ring, so that the bottom line ring cannot be effectively enlarged, the needle 4 can be lowered to penetrate into the bottom line ring at a certain probability and cannot penetrate into the bottom line ring at the moment, then the curved needle 5 drives the bottom line 10 to withdraw from the upper line ring, chain stitch cannot be formed between the upper line 9 and the bottom line 10, and the problem that a seam lifting belt cannot lift the bottom line 10 occurs. The utility model provides a press from both sides line subassembly 3, press from both sides line subassembly 3 with the bottom line 10 clamp between curved needle 5 and the cam wire hook subassembly 1, when curved needle 5 retreats and forms the bottom line wire loop, the unable bottom line 10 of drawing of routing cam 2 routing can only follow the extraction line volume of routing cam 2 one side from curved needle 5 one side, consequently the bottom line wire loop can expand fast, needle 4 can pierce the bottom line wire loop more easily when descending, then tighten up by upper thread 9, thereby form the line knot, form the chain stitch between upper thread 9 and the bottom line 10 after many times, thereby solve among the prior art needle 4 has the probability not pierced the bottom line wire loop in, the problem of the not going up bottom line 10 of play seam area appears.

Further, in the present embodiment, the cam wire hook assembly 1, the wire bonding cam 2, and the looper 5 are configured as in the prior art.

Preferably, as shown in fig. 2, the thread clamping assembly 3 comprises a thread clamping base 31, a thread clamping device 32, a thread clamping fixing part 33 and a thread clamping movable part 34, wherein the thread clamping base 31 is fixedly connected with the chain stitch machine through screws, the thread clamping device 32 comprises a thread clamping device fixing shell and a thread clamping device telescopic piece, the thread clamping device fixing shell is fixedly connected with the thread clamping fixing part 33, and the thread clamping device telescopic piece is fixedly connected with the thread clamping movable part 34; the base thread 10 is inserted between the thread clamping fixing part 33 and the thread clamping movable part 34. Further, in this embodiment, the wire gripper 32 employs an electromagnet, the outer shell of the electromagnet is a wire gripper fixing shell, the iron core of the electromagnet is a wire gripper telescopic member, and when the wire gripper 32 is energized, the electromagnet generates magnetism to generate attraction force to the iron core, that is, the wire gripper moving part 34 is offset toward the wire gripper fixing part 33, so as to grip the base wire 10. In other embodiments, the thread clamp 32 may also use an air cylinder, the outer shell of the air cylinder is a fixing shell of the thread clamp, the piston end of the air cylinder is a telescopic member of the thread clamp, and the bottom thread 10 is clamped by telescopic action of the air cylinder. In other embodiments, the wire gripper 32 may also be a linear motor, where the housing of the linear motor is a wire gripper fixing housing, and the motor shaft of the linear motor is a wire gripper telescopic member, so as to implement clamping of the base wire 10 through telescopic action of the linear motor.

The thread clamping fixing portion 33 and the thread clamping movable portion 34 may be directly driven by the thread clamp 32 or indirectly driven by another driving mechanism.

Further, as shown in fig. 2, in this embodiment, the wire clamping base 31 and the wire clamping device 32 are fastened together, that is, the wire clamping base 31 and the wire clamping device 32 are two separate workpieces and are fastened together through a clamping groove or other structures, so that when the wire clamping device 32 fails, the replacement and maintenance can be quickly and conveniently performed. In other embodiments, the thread clamp base 31 and the thread clamp 32 are one piece, i.e. the thread clamp base 31 is part of a thread clamp fixing housing, the thread clamp base 31 being fastened to the chain stitch machine by screws, i.e. the thread clamp 32 is fastened to the chain stitch machine.

Preferably, in this embodiment, the chain stitch machine further includes a main shaft, and a control unit for detecting a rotation angle of the main shaft, and the control unit is communicatively connected to the thread clamp 32. In this embodiment, a control unit is provided, and the control unit is configured to detect the rotation angle of the spindle, and when the spindle rotates to a certain angle, the control unit sends a signal to the thread clamp 32, and the thread clamp 32 receives the signal and drives the thread clamp movable portion 34 to shift toward the thread clamp fixed portion 33, so as to clamp the bobbin thread 10, that is, the purpose of the control unit is to accurately control the working time of the thread clamp 32.

In order to achieve the above purpose or other purposes, the utility model also discloses a chain stitch machine, which adopts the chain stitch trimming and starting auxiliary device, and comprises a needle 4, wherein a needle hole is formed in the needle 4, and an upper thread 9 is penetrated in the needle hole; the curved needle 5 is provided with a curved needle hole, the bottom thread 10 is arranged on the curved needle hole in a penetrating way, and the upper thread 9 and the bottom thread 10 form a chain stitch. Further, as shown in fig. 1, the chain stitch machine further comprises a casing 7 and a bottom plate 8, wherein the casing 7 is fixed on the top surface of the bottom plate 8, the needle 4 is arranged in the casing 7 in a vertically movable manner, and the thread clamping assembly 3 is fixed inside the bottom plate 8. The wire clamping base 31 is fastened to the bottom surface of the bottom plate 8 by screws.

Preferably, as shown in fig. 1 and 3, the chain stitch machine further comprises a thread cutting mechanism 6, and the thread cutting mechanism 6 is arranged on the left side surface of the needle 4; the thread cutting mechanism 6 comprises a thread cutting driving component, a transmission component, a thread cutting moving blade, a thread cutting fixed blade and a thread cutting compacting component, wherein the thread cutting driving component is connected with the thread cutting moving blade through the transmission component, the thread cutting moving blade is arranged at the lower side of the thread cutting fixed blade, and when the thread cutting moving blade hooks the upper thread 9 and the bottom thread 10, the thread cutting moving blade is abutted with the thread cutting fixed blade to cut threads; the thread cutting compression assembly is used for providing compression force between the thread cutting movable cutter and the thread cutting fixed cutter and clamping the thread end of the bottom thread 10 after thread cutting. Further, in this embodiment, the thread cutting and compacting assembly includes a thread clamping piece and a first pressing plate, where the thread clamping piece and the first pressing plate provide compacting force in the thread cutting process of the thread cutting moving knife and the thread cutting fixed knife, and clamp the bottom thread 10 and the thread end of the upper thread 9 after thread cutting. This cut line compresses tightly subassembly and application number: the trimming hold down assembly in 202320014136.2 is identical. In other embodiments, the thread cutting and compacting assembly may also include a thread clamping piece, a first pressing plate, and a second pressing plate, where the thread clamping piece, the first pressing plate, and the second pressing plate are sequentially disposed from top to bottom, and the thread clamping piece, the first pressing plate, and the second pressing plate provide compacting forces during thread cutting by the thread cutting moving knife and the thread cutting fixed knife, clamp the thread ends of the base thread 10 and the upper thread 9 after thread cutting, and adjust the compacting forces and the thread clamping forces by adjusting the left-right relationship among the thread clamping piece, the first pressing plate, and the second pressing plate (for example, the thread cutting and compacting assembly with publication number CN217922579U filed by the company).

Further, in this embodiment, the wire cutting driving assembly, the transmission assembly, the wire cutting moving blade, the wire cutting fixed blade, and the wire cutting compressing assembly in the wire cutting mechanism 6 are identical to the structures in application number 202320014136.2 of the company. In other embodiments, the wire cutting drive assembly, transmission assembly, in the wire cutting mechanism 6 are identical to the structure employed in the present company application publication number CN217922579U (see paragraph [ 0042 ] of that patent for details). The wire cutting moving knife, the wire cutting stationary knife and the wire cutting compacting assembly in the wire cutting mechanism 6 are consistent with the structure adopted in the publication No. CN217922579U of the company application (see the section [ 0045 ] of the patent for details).

Preferably, in this embodiment, the chain stitch machine further includes a thread releasing mechanism, which is consistent with the structure adopted in application number 202320014136.2 of the present company application. In other embodiments, the thread release mechanism is consistent with the structure employed in the present company application, publication number CN217922579U (see paragraph [ 0043 ] of that patent for details).

The utility model relates to a chain seam trimming and lifting auxiliary device and a chain seam machine, which comprises the following working steps:

a1: after the last thread cutting is completed, the thread cutting moving knife and the thread clamping piece clamp the thread end of the bottom thread 10 and keep the clamping state, the needle 4 is positioned at the upper needle stopping position, and the bent needle 5 is positioned at the leftmost end; the state of each part is the initial state of the chain stitch machine.

A2: operating a chain stitch machine by an operator to stitch the stitching materials;

a3: the main shaft of the chain stitch machine rotates for the first circle (namely, the rotation angle of the main shaft is 0-360 degrees), and in the process of rotating the main shaft for the first circle, the curved needle 5 finishes one-time backward (rightward deviation) and forward (leftward deviation), the needle 4 finishes one-time descending and ascending, and the wire bonding cam 2 rotates for one circle.

A3.1: wherein, when the curved needle 5 retreats, the needle 4 descends, the wire bonding cam 2 bonds wires, and the wire ends of the base wire 10 are elongated because the wire ends of the base wire 10 are clamped by the wire clamping pieces and the compensation amount of the base wire 10 is provided in advance when the wire is cut last time.

A3.2: when the curved needle 5 advances, the needle 4 rises to drive the upper thread 9 to generate an upper thread loop, the curved needle 5 advances and hooks the upper thread loop, and the state of the bottom thread 10 is shown in fig. 3.

A4: the main shaft of the chain stitch machine rotates for the second period (namely, the rotation angle of the main shaft is 360-540 degrees), the control unit detects the rotation angle of the main shaft of the chain stitch machine, and when the detected rotation angle of the main shaft is 360-540 degrees (the specific detection angle is properly adjusted according to the requirement), the control unit sends a control signal to the thread clamp 32, the thread clamp telescopic piece in the thread clamp 32 moves in the thread clamp fixing shell, and then the thread clamp movable part 34 is driven to move to the thread clamp fixing part 33, so that the bottom thread 10 is clamped.

A4.1: in the second cycle of the spindle rotation, the looper 5 retreats (deflects rightward), the lower thread loop expands, the wire bonding cam 2 bonds but only draws wire from the right side of the wire bonding cam 2, at this time, the needle 4 descends to drive the upper thread loop to pierce into the lower thread loop, and tightens the upper thread loop;

a4.2: after the needle 4 is inserted into the bobbin thread loop, the control unit sends a control signal to the thread clamp 32, and the thread clamp telescopic piece in the thread clamp 32 moves reversely in the thread clamp fixing shell, so that the thread clamp movable part 34 is driven to be far away from the thread clamp fixing part 33, and the bobbin thread 10 is loosened.

A4.3: after the needle 4 pierces the bottom thread loop and runs to the lowest position in step a4.1, the needle 4 rises with the rotation of the main shaft, the curved needle 5 advances (deflects leftwards) to pick up the upper thread loop on the needle 4 again until the needle 4 rises to the highest position, and the curved needle 5 is at the leftmost end, namely, the chain stitch machine returns to the initial state.

A5: the main shaft continuously rotates, and the chain stitch machine repeats the steps A3-A4.3 until the sewing is finished.

Further, in step A4 of the present embodiment, when the wire clamp 32 is an electromagnet, the control unit sends a control signal to the wire clamp 32, that is, the control unit controls the on/off of the circuit of the wire clamp 32, so as to clamp and unclamp the base wire 10.

The working principle of the utility model is as follows: in the process of rotating the main shaft for the second week, the bent needle 5 moves back the needle 4 to descend and penetrate into the bottom wire loop, and the wire bonding cam 2 bonds wires; in the prior art, the wire end of the bottom wire 10 is clamped, and the looper 5 retreats to form a bottom wire loop, so that the wire quantity of the bottom wire loop is easily drawn away by the wire bonding cam 2, the bottom wire loop cannot be effectively enlarged, the machine needle 4 cannot penetrate into the bottom wire loop at a certain probability, and the looper 5 can withdraw from the upper wire loop with the bottom wire 10, so that a chain stitch cannot be formed. According to the utility model, the thread clamping assembly 3 is added, when the main shaft rotates for the second circle, the bottom thread 10 is clamped firstly, so that the bottom thread 10 cannot be drawn from one side of the bent needle 5 in the process that the bent needle 5 retreats to form the bottom thread loop by the thread bonding cam 2, the thread quantity of the bottom thread loop cannot be reduced, the bottom thread loop can be rapidly expanded, the needle 4 can be more easily penetrated into the bottom thread loop when descending, then the bottom thread loop is collected by the upper thread 9 to form a thread knot, the bottom thread loop can be stably formed in each subsequent rotation of the main shaft, and therefore a chain stitch is formed, and the probability that the sewing tape cannot be attached to the bottom thread 10 is reduced.

The auxiliary device for chain seam shearing and seam lifting and the chain seam machine have the following beneficial effects:

1. be provided with the clamp line subassembly 3, press from both sides the bottom line 10 clamp through clamp line subassembly 3 with between curved needle 5 and the cam wire hook subassembly 1, the wire bonding cam 2 routing is taken off the line volume of bottom line wire loop when avoiding curved needle 5 to retreat, helps expanding the bottom line wire loop, improves the probability of bottom line 10 on the seam tape, and the seam stability is high.

2. Simple structure, simple to operate, with low costs, easy threading when operating workman in-service use.

In conclusion, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (7)

1. The utility model provides a chain stitch scissors line plays seam auxiliary device, is applied to the chain stitch machine, the chain stitch machine includes curved needle (5), cam wire hook assembly (1), and routing cam (2), and bobbin thread (10) wears to locate on cam wire hook assembly (1) and curved needle (5), routing cam (2) are used for wearing bobbin thread (10) of locating on cam wire hook assembly (1); the method is characterized in that: the wire clamping device comprises a wire clamping assembly (3), wherein the wire clamping assembly (3) is arranged between a bent needle (5) and a cam wire hook assembly (1) and is used for clamping a base wire (10) between the bent needle (5) and the cam wire hook assembly (1).

2. The chain stitch scissors seam lifting auxiliary device according to claim 1, wherein: the wire clamping assembly (3) comprises a wire clamping base (31), a wire clamping device (32), a wire clamping fixing part (33) and a wire clamping movable part (34), wherein the wire clamping base (31) is fixedly connected with a chain stitch machine, the wire clamping device (32) comprises a wire clamping device fixing shell and a wire clamping device telescopic piece, the wire clamping device fixing shell is connected with the wire clamping fixing part (33), and the wire clamping device telescopic piece is connected with the wire clamping movable part (34); the base thread (10) is arranged between the thread clamping fixing part (33) and the thread clamping movable part (34) in a penetrating way.

3. The chain stitch scissors seam lifting auxiliary device according to claim 2, wherein: the wire clamp (32) is an electromagnet.

4. The chain stitch scissors seam lifting auxiliary device according to claim 2, wherein: the chain stitch machine further comprises a main shaft and a control unit for detecting the rotation angle of the main shaft, and the control unit is in communication connection with the thread clamp (32).

5. A chain stitch machine comprising the chain stitch shear thread take-up assist device as recited in any one of claims 1-4, characterized in that: the needle also comprises a needle (4), wherein an organic needle hole is formed in the needle (4), and an upper thread (9) is arranged in the needle hole in a penetrating manner; the curved needle (5) is provided with a curved needle hole, the bottom thread (10) is arranged on the curved needle hole in a penetrating mode, and the upper thread (9) and the bottom thread (10) form a chain stitch.

6. The chain stitch machine as set forth in claim 5, wherein: the novel sewing machine further comprises a machine shell (7) and a bottom plate (8), wherein the machine shell (7) is fixed on the top surface of the bottom plate (8), the machine needle (4) can move up and down and is arranged in the machine shell (7), and the wire clamping assembly (3) is fixed inside the bottom plate (8).

7. The chain stitch machine as set forth in claim 5, wherein: the chain stitch machine further comprises a thread cutting mechanism (6), and the thread cutting mechanism (6) is arranged on the outer side face of the needle (4); the thread cutting mechanism (6) comprises a thread cutting driving assembly, a transmission assembly, a thread cutting moving blade, a thread cutting fixed blade and a thread cutting compacting assembly, wherein the thread cutting driving assembly is connected with the thread cutting moving blade through the transmission assembly, the thread cutting moving blade is arranged at the lower side of the thread cutting fixed blade, and when the thread cutting moving blade hooks an upper thread (9) and a bottom thread (10), the thread cutting moving blade is abutted with the thread cutting fixed blade to cut threads; the thread cutting compression assembly is used for providing compression force between the thread cutting movable cutter and the thread cutting fixed cutter and clamping thread ends of the base thread (10) after thread cutting.

Images