CN215163577U

CN215163577U - Synchronous double-needle sewing machine

Info

Publication number: CN215163577U
Application number: CN202121472381.5U
Authority: CN
Inventors: 张乐先; 刘兴华
Original assignee: Shenzhen Chaocheng Sewing Technology Co ltd
Current assignee: Shenzhen Chaocheng Sewing Technology Co ltd
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2021-12-14
Anticipated expiration: 2031-06-30

Abstract

The utility model discloses a synchronous double-needle sewing machine, including faller, double-needle aircraft nose and double-shuttle device set up in both sides about the faller relatively to and synchronous transmission and rotary driving device, synchronous transmission has input, first output and second output, the input is connected with rotary driving device, first output with the double-needle aircraft nose is connected, the second output with the double-shuttle device is connected, in order to drive under the drive of rotary driving device the double-needle aircraft nose and double-shuttle device around the coaxial synchronous rotation of Z axle, the Z axle is perpendicular to the faller; and the feeding device is used for driving the fabric to be sewn to translate on the needle plate along an X axis and a Y axis, and the X axis, the Y axis and the Z axis are vertical to each other. The synchronous double-needle sewing machine adopts automatic feeding, the double-needle machine head and the double-shuttle device can coaxially and synchronously rotate, and the angle and the position of a fabric to be sewn can be automatically positioned according to the data of sewing patterns.

Description

Synchronous double-needle sewing machine

Technical Field

The utility model relates to a sewing machine especially relates to a synchronous two-needle sewing machine.

Background

The sewing machine mainly aims at combining a plurality of layers of fabrics to be sewn through sewing, but with the continuous evolution of application purposes, the sewing machines on the market currently have various types of sewing machines aiming at sewing the sewing threads on the fabrics to be sewn instead of combining the fabrics, so that the sewing threads generate special pattern lines on the fabrics to be sewn, wherein the most common application at present is a double-needle sewing machine.

The existing double-needle sewing machine needs to manually hold the fabric to be sewn under the machine head for sewing, so that the efficiency is not high, the sewing machine is very unsafe, if curved patterns are sewn on the fabric to be sewn, the positioning precision of the angle and the position is extremely low, a large amount of skilled workers are needed, and the labor cost is high.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects of the prior art, the utility model provides a synchronous two-needle sewing machine adopts autoloading, but two needle aircraft nose and two shuttle devices coaxial synchronous rotation, can treat the angle of seam surface fabric and the carrying out automatic positioning of position according to the data of sewing decorative pattern.

The utility model discloses the technical problem that will solve realizes through following technical scheme:

a synchronous double-needle sewing machine comprises a needle plate, a double-needle machine head and a double-shuttle device, wherein the double-needle machine head and the double-shuttle device are oppositely arranged on the upper side and the lower side of the needle plate, and

the synchronous transmission device is provided with an input end, a first output end and a second output end, the input end is connected with the rotary driving device, the first output end is connected with the double-needle machine head, the second output end is connected with the double-shuttle device so as to drive the double-needle machine head and the double-shuttle device to coaxially and synchronously rotate around a Z axis under the driving of the rotary driving device, and the Z axis is vertical to the needle plate;

and the feeding device is used for driving the fabric to be sewn to translate on the needle plate along an X axis and a Y axis, and the X axis, the Y axis and the Z axis are vertical to each other.

Furthermore, the double-needle handpiece comprises a handpiece base, a double-needle mechanism and a needle shifting mechanism, and the handpiece base is connected with the first output end of the synchronous transmission device; the double-needle mechanism and the needle shifting mechanism are arranged in the headstock, the double-needle handpiece comprises a needle rod and a first needle head and a second needle head which are arranged at the lower end of the needle rod, and the first needle head and the second needle head extend out of the lower part of the headstock; the needle shifting mechanism is connected with and drives the needle rod to simultaneously drive the first needle head and the second needle head to do reciprocating axial motion along the Z axis.

Furthermore, the needle shifting mechanism comprises a needle shifting driver, a needle shifting output shaft, a needle shifting turntable, a needle shifting connecting rod, a needle shifting guide rail and a needle shifting slider, the needle shifting guide rail is fixedly arranged on the headstock, the needle shifting slider is connected to the needle shifting guide rail in a sliding manner and is fixedly connected with the needle rod, and the needle shifting driver drives the needle shifting turntable to rotate through the connection of the needle shifting output shaft; one end of the needle poking connecting rod is rotatably connected to a circumferential point of the needle poking turntable, and the other end of the needle poking connecting rod is rotatably connected to the needle poking sliding block, so that the rotation of the needle poking turntable is converted into the sliding of the needle poking sliding block, and the needle rod is driven to axially reciprocate along the Z axis.

The double-needle machine head further comprises a presser foot mechanism arranged in the machine head seat, the presser foot mechanism comprises a presser foot driver, a presser foot output shaft, a presser foot transmission connecting rod group, a presser foot rod and a presser foot, the presser foot is fixedly arranged on the presser foot rod and extends to the lower parts of the first needle head and the second needle head, and a first via hole and a second via hole which correspond to the first needle head and the second needle head respectively are formed in the presser foot; the presser foot driver is connected and drives the presser foot rod to drive the presser foot to lift along the Z axis through the presser foot output shaft and the presser foot transmission connecting rod group in sequence.

Furthermore, the double-needle handpiece also comprises a routing mechanism arranged outside the handpiece seat and used for limiting routing paths of two sewing threads entering the double-needle mechanism; walk the line mechanism and include two and go up thread trappers, two thread trappers and a tensioner down, twice trough has on the tensioner, go up the one-to-one between thread trapper, lower thread trapper and the trough, two sets of thread trappers, lower thread trapper and trough are corresponding to the entering respectively the sewing line of first syringe needle and second syringe needle.

Furthermore, the double-shuttle device comprises a shuttle race turntable, a needle plate base plate, a rotating shuttle driver, a driving gear, two first adjusting gears, a first rotating shuttle and a second rotating shuttle, wherein the needle plate base plate synchronously rotates along with the shuttle race turntable; the needle plate backing plate is positioned in the center of the shuttle race turntable and is provided with a first needle hole and a second needle hole which respectively correspond to the first needle head and the second needle head, and the first rotating shuttle and the second rotating shuttle are respectively positioned on two sides of the needle plate backing plate; one of the two first adjusting gears is connected between the driving gear and the first rotating shuttle, and the other one of the two first adjusting gears is connected between the driving gear and the second rotating shuttle; the rotating shuttle driver is connected with and drives the driving gear to rotate, and then the first rotating shuttle and the second rotating shuttle are driven to synchronously rotate through the transmission of the two first adjusting gears so as to respectively hook the sewing threads in the first needle hole and the second needle hole to form a thread loop.

Furthermore, the double-shuttle device also comprises a cam, a thread cutting seat, a thread cutting slide bar, a thread cutting connecting rod, a driven gear, two second adjusting gears, a first movable knife and a second movable knife which synchronously rotate along with the rotating disc of the shuttle race, wherein the first movable knife corresponds to the first rotating shuttle, and the second movable knife corresponds to the second rotating shuttle; the cam is coaxially connected with the driving gear, and the thread cutting seat is arranged below the needle plate base plate; the line cutting slide rod penetrates through the line cutting seat, one end of the line cutting slide rod faces the cam, and the other end of the line cutting slide rod faces the driven gear; one end of the tangent connecting rod is rotatably connected to one end, facing the driven gear, of the tangent sliding rod, and the other end of the tangent connecting rod is rotatably connected to the circumference of the driven gear; one of the two second adjusting gears is connected between the driven gear and the first movable knife, and the other one of the two second adjusting gears is connected between the driven gear and the second movable knife; when the cam rotates synchronously along with the driving gear, the cam can push the tangent slide rod to slide for a certain distance towards the driven gear, so that the driven gear rotates forwards for a certain angle through the transmission of the tangent connecting rod, and the first movable knife and the second movable knife rotate synchronously through the transmission of the two second adjusting gears, so that the first movable knife and the second movable knife cut off sewing threads in the first rotating shuttle and the second rotating shuttle respectively.

Furthermore, the double-shuttle device also comprises a reset driver which is provided with a mandril and synchronously rotates along with the shuttle bed turntable, and a vertical column is arranged on the circumference of the driven gear; when the vertical column of the driven gear is positioned at the tangent line position, the ejector rod in the reset driver extends out to push the vertical column back to the initial position so as to push the driven gear to rotate reversely for a certain angle, and then the first movable cutter and the second movable cutter synchronously reset and rotate through the transmission of the two second adjusting gears.

Further, the synchronous transmission device comprises a first transmission rod connected with the double-needle machine head, a second transmission rod connected with the double-shuttle device and a synchronous transmission rod, an input gear is coaxially arranged on the synchronous transmission rod, and the input gear is used as the input end of the synchronous transmission device and connected with the rotary driving device; two ends of the synchronous transmission rod are respectively provided with a transmission gear, and the transmission gears at the two ends are respectively in transmission connection with the first transmission rod and the second transmission rod; the other end of the first transmission rod is connected with a first transmission gear set, the first transmission gear set serves as a first output end of the synchronous transmission device, and the transmission direction is connected with the double-needle handpiece after being turned by 90 degrees; the other end of the second transmission rod is connected with a second transmission gear set, and the second transmission gear set is used as a second output end of the synchronous transmission device and is connected with the rotary driving device after the transmission direction is turned by 90 degrees.

Furthermore, the outer wall surface of the synchronous transmission rod is also provided with a locking hole, and the synchronous transmission device also comprises a locking block and a locking driver which is used for connecting and driving the locking block to be inserted into the locking hole or pulled out of the locking hole.

The utility model discloses following beneficial effect has: the synchronous double-needle sewing machine adopts automatic feeding, the double-needle machine head and the double-shuttle device can coaxially and synchronously rotate, and the angle and the position of a fabric to be sewn can be automatically positioned according to the data of sewing patterns.

Drawings

Fig. 1 is a schematic view of a synchronous double-needle sewing machine provided by the present invention;

FIG. 2 is a schematic front view of a two-needle head of the synchronous two-needle sewing machine shown in FIG. 1;

FIG. 3 is a rear view of a two-needle head of the synchronous two-needle sewing machine of FIG. 1;

FIG. 4 is a rear schematic view of a thread running mechanism in the synchronous two-needle sewing machine of FIG. 1;

FIG. 5 is a schematic view of a double shuttle device of the synchronous double needle sewing machine shown in FIG. 1;

FIG. 6 is an exploded view of the double shuttle device of the synchronous double needle sewing machine shown in FIG. 1;

FIG. 7 is a schematic view of a reset transmission in the dual shuttle device of FIG. 6;

FIG. 8 is a first partial schematic view of a synchronous drive of the synchronous double needle sewing machine of FIG. 1;

FIG. 9 is a second partial schematic view of the synchronous drive of the synchronous double needle sewing machine of FIG. 1;

fig. 10 is a schematic view of a feeding device in the synchronous two-needle sewing machine shown in fig. 1.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and examples.

As shown in fig. 1 and 8, a synchronous two-needle sewing machine includes a needle plate 100, a two-needle head 1 and a two-shuttle device 2, the two-needle head 1 and the two-shuttle device 2 being oppositely disposed on upper and lower sides of the needle plate 100, an

A synchronous transmission device 3 and a rotary driving device 4, wherein the synchronous transmission device 3 is provided with an input end, a first output end 301 and a second output end 302, the input end is connected with the rotary driving device 4, the first output end 301 is connected with the double-needle head 1, the second output end 302 is connected with the double-shuttle device 2, so that the double-needle head 1 and the double-shuttle device 2 are driven by the rotary driving device 4 to coaxially and synchronously rotate around a Z axis, and the Z axis is vertical to the needle plate 100;

and the feeding device 5 is used for driving the fabric to be sewn to translate on the needle plate 100 along an X axis and a Y axis, and the X axis, the Y axis and the Z axis are vertical to each other.

When the synchronous double-needle sewing machine is used, the feeding device 5 drives a fabric to be sewn to move horizontally along an X axis and a Y axis so as to position the sewing position of the fabric to be sewn, the double-needle machine head 1 and the double-shuttle device 2 rotate coaxially and synchronously around a Z axis so as to position the sewing angle of the fabric to be sewn, and a technician only needs to guide data of the sewing position and the sewing angle of a sewing pattern into a control system of the synchronous double-needle sewing machine in advance, and the control system of the synchronous double-needle sewing machine can automatically position the sewing position and the sewing angle of the fabric to be sewn according to the guided data.

In this embodiment, the sewing position is based on the midpoint of the connecting line of the two needles (the first needle 122 and the second needle 123) of the two-needle handpiece 1.

As shown in fig. 2 and 3, the double-needle handpiece 1 includes a handpiece base 11, a double-needle mechanism 12 and a needle-dialing mechanism 13, wherein the handpiece base 11 is connected with a first output end 301 of the synchronous transmission device 3; the double-needle mechanism 12 and the needle-setting mechanism 13 are arranged in the headstock 11, the double-needle mechanism 12 includes a needle rod 121 and a first needle 122 and a second needle 123 which are arranged at the lower end of the needle rod 121, and the first needle 122 and the second needle 123 extend out to the lower part of the headstock 11; the needle-setting mechanism 13 is connected to drive the needle bar 121 to simultaneously drive the first needle 122 and the second needle 123 to reciprocate axially along the Z-axis.

The needle-setting mechanism 13 comprises a needle-setting driver 131, a needle-setting output shaft 132, a needle-setting dial 133, a needle-setting connecting rod 134, a needle-setting guide rail 135 and a needle-setting slider 136, the needle-setting guide rail 135 is fixedly arranged on the headstock 11, the needle-setting slider 136 is slidably connected to the needle-setting guide rail 135 and is fixedly connected with the needle bar 121, and the needle-setting driver 131 is connected to and drives the needle-setting dial 133 to rotate through the needle-setting output shaft 132; one end of the needle-setting connecting rod 134 is rotatably connected to a circumferential point of the needle-setting dial 133, and the other end of the needle-setting connecting rod is rotatably connected to the needle-setting slider 136, so that the rotation of the needle-setting dial 133 is converted into the sliding of the needle-setting slider 136, and the needle rod 121 is driven to reciprocate axially along the Z axis.

In this embodiment, the needle-setting driver 131 is a servo motor, and in a specific implementation, the needle-setting driver 131 may also be another conventional power device, and the protection scope of the present application should not be limited thereto.

The double-needle handpiece 1 further comprises a presser foot mechanism 14 arranged in the handpiece base 11, the presser foot mechanism 14 comprises a presser foot driver 141, a presser foot output shaft 142, a presser foot transmission linkage 143, a presser foot rod 144 and a presser foot 145, the presser foot 145 is fixedly arranged on the presser foot rod 144 and extends to the lower part of the first needle 122 and the second needle 123, and a first via hole and a second via hole corresponding to the first needle 122 and the second needle 123 are formed; the presser foot driver 141 is connected to drive the presser foot rod 144 to drive the presser foot 145 to lift along the Z axis through the presser foot output shaft 142 and the presser foot transmission linkage 143 in sequence.

In this embodiment, the presser foot driver 141 is a stepping motor, and in a specific implementation, the presser foot driver 141 may be another conventional power device, and the protection scope of the present invention should not be limited thereto.

As shown in fig. 1, the double-needle handpiece 1 further includes a routing mechanism 15 disposed outside the handpiece base 11 for defining a routing path of two sewing threads entering the double-needle mechanism 12; as shown in fig. 4, the routing mechanism 15 includes two upper thread grippers 151, two lower thread grippers 152 and a tensioner 153, two routing grooves are provided on the tensioner 153, the upper thread grippers 151, the lower thread grippers 152 and the routing grooves are in one-to-one correspondence, and two sets of the upper thread grippers 151, the lower thread grippers 152 and the routing grooves respectively correspond to sewing threads entering the first needle 122 and the second needle 123.

As shown in fig. 5 to 7, the double shuttle device 2 includes a bed rotating disk 21, and a needle plate backing plate 22, a rotating shuttle driver 23, a driving gear 24, two first adjusting gears 25, a first rotating shuttle 26 and a second rotating shuttle 27 which rotate synchronously with the bed rotating disk 21, wherein the bed rotating disk 21 is connected with a second output end 302 of the synchronous transmission device 3; the needle plate backing plate 22 is positioned in the center of the shuttle table rotating disc 21 and is provided with a first needle hole and a second needle hole corresponding to the first needle 122 and the second needle 123 respectively, and the first rotating shuttle 26 and the second rotating shuttle 27 are positioned on two sides of the needle plate backing plate 22 respectively; one of the two first adjustment gears 25 is connected between the driving gear 24 and the first rotary hook 26, and the other is connected between the driving gear 24 and the second rotary hook 27; the rotating shuttle driver 23 is connected to drive the driving gear 24 to rotate, and further the first rotating shuttle 26 and the second rotating shuttle 27 are driven to rotate synchronously by the transmission of the two first adjusting gears 25 so as to hook the sewing threads in the first needle hole and the second needle hole respectively to form a thread loop.

In this embodiment, the rotating shuttle driver 23 employs a driving motor, and in a specific implementation, the rotating shuttle driver 23 may also employ other conventional power devices, and the protection scope of the present application should not be limited thereto.

The double-shuttle device 2 further comprises a cam 213, a tangent base 214, a tangent slide bar 215, a tangent connecting bar 216, a driven gear 29, two second adjusting gears 210, a first movable knife 211 and a second movable knife 212 which synchronously rotate along with the shuttle race turntable 21, wherein the first movable knife 211 corresponds to the first rotating shuttle 26, and the second movable knife 212 corresponds to the second rotating shuttle 27; the cam 213 is coaxially connected with the driving gear 24, and the thread cutting seat 214 is arranged below the needle plate backing plate 22; the tangent slide bar 215 passes through the tangent seat 214, and one end of the tangent slide bar faces the cam 213 and the other end faces the driven gear 29; one end of the tangent link rod 216 is rotatably connected to one end of the tangent sliding rod 215 facing the driven gear 29, and the other end is rotatably connected to the circumference of the driven gear 29; one of the two second adjusting gears 210 is connected between the driven gear 29 and the first movable blade 211, and the other is connected between the driven gear 29 and the second movable blade 212; when the cam 213 rotates synchronously with the driving gear 24, the tangent slide bar 215 is pushed to slide a certain distance to the driven gear 29, so that the driven gear 29 rotates forward by a certain angle through the transmission of the tangent link 216, and the first movable blade 211 and the second movable blade 212 rotate synchronously through the transmission of the two second adjusting gears 210, so that the first movable blade 211 and the second movable blade 212 cut off the sewing threads in the first rotary shuttle 26 and the second rotary shuttle 27 respectively.

The double shuttle device 2 further comprises a reset driver 28 with a top rod 281 synchronously rotating along with the shuttle table rotating disc 21, and a vertical column 291 is arranged on the circumference of the driven gear 29; when the vertical column 291 of the driven gear 29 is located at the tangent line position, the top rod 281 in the reset driver 28 extends out to push the vertical column 291 back to the initial position, so as to push the driven gear 29 to rotate reversely by a certain angle, and further, the first movable blade 211 and the second movable blade 212 are synchronously reset and rotated by the transmission of the two second adjusting gears 210.

In this embodiment, the reset driver 28 is a ram cylinder, and in a specific implementation, the reset driver may also be another conventional power device, and the protection scope of the present disclosure should not be limited thereto.

In this embodiment, the rotating shuttle driver 23 is disposed below the shuttle race turntable 21, and the needle plate backing plate 22, the driving gear 24, the two first adjusting gears 25, the first rotating shuttle 26, the second rotating shuttle 27, the tangent line driver 28, the driven gear 29, the first moving blade 211, the second moving blade 212, the two second adjusting gears 210, the reset transmission mechanism, and the like are disposed above the shuttle race turntable 21.

As shown in fig. 8 and 9, the synchronous transmission device 3 includes a first transmission rod 31 connected to the double-needle handpiece 1, a second transmission rod 32 connected to the double-shuttle device 2, and a synchronous transmission rod 33, an input gear 34 is coaxially disposed on the synchronous transmission rod 33, and the input gear 34 is connected to the rotary drive device 4 as an input end of the synchronous transmission device 3; two ends of the synchronous transmission rod 33 are respectively provided with a transmission gear 35, and the transmission gears 35 at the two ends are respectively in transmission connection with the first transmission rod 31 and the second transmission rod 32; the other end of the first transmission rod 31 is connected with a first transmission gear set (not shown), the first transmission gear set (not shown) is used as a first output end 301 of the synchronous transmission device 3, and the transmission direction is connected with the double-needle handpiece 1 after being turned by 90 degrees; the other end of the second transmission rod 32 is connected to a second transmission gear set 36, and the second transmission gear set 36 is used as a second output end 302 of the synchronous transmission device 3, and is connected to the rotation driving device 4 after the transmission direction is turned by 90 degrees.

In this embodiment, the rotation driving device 4 is a driving motor, and when the rotation driving device 4 is implemented specifically, other conventional power devices may be used, and the protection scope of the present invention should not be limited thereto.

The outer wall surface of the synchronous transmission rod 33 is further provided with a locking hole 330, and the synchronous transmission device 3 further comprises a locking block 37 and a locking driver 38 which is connected with and drives the locking block 37 to be inserted into the locking hole 330 or pulled out of the locking hole 330. When the locking block 37 is inserted into the locking hole 330, the synchronous transmission rod 33 is locked by the locking block 37 and cannot rotate, and the pause positions of the double-needle handpiece 1 and the double-shuttle device 2 can be locked to avoid deviation when the double-needle handpiece 1 and the double-shuttle device 2 pause rotation.

As shown in fig. 10, the feeding device 5 includes a material clamping mechanism 51 and a moving mechanism 52, the material clamping mechanism 51 is used for clamping a fabric template on the needle plate 100, and the fabric to be sewn is placed in the fabric template; the moving mechanism 52 is connected with and drives the material clamping mechanism 51 to translate along the X axis and the Y axis, so as to drive the material to be sewn in the material template to translate on the needle plate 100 along the X axis and the Y axis.

The material clamping mechanism 51 comprises a template clamping groove, a template clamping block and a material clamping driver, wherein the template clamping groove is used for clamping one side to be clamped on the fabric template, the template clamping block is rotatably arranged on the template clamping groove, and the side to be clamped on the fabric template is clamped or loosened in the template clamping groove during rotation; the material clamping driver is arranged on the template clamping groove and is connected with and drives the template clamping block to rotate.

In this embodiment, the clamping driver adopts an adjustable cylinder, and in a specific implementation, the clamping driver may also adopt other conventional power devices, and the protection scope of the present application should not be limited thereto.

Moving mechanism 52 includes X to sliding rail set spare, Y to sliding rail set spare, X to driver and Y to the driver, press from both sides material mechanism 51 set up in Y is to sliding rail set spare is last, Y to sliding rail set spare set up in X is to sliding rail set spare is last, X connects the drive to the driver X slides to sliding rail set spare, Y connects the drive to the driver Y slides to sliding rail set spare.

The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is specific and detailed, but the invention can not be understood as the limitation of the patent scope of the present invention, but all the technical solutions obtained by adopting the equivalent substitution or equivalent transformation should fall within the protection scope of the present invention.

Claims

1. A synchronous double-needle sewing machine is characterized by comprising a needle plate, a double-needle machine head and a double-shuttle device, wherein the double-needle machine head and the double-shuttle device are oppositely arranged on the upper side and the lower side of the needle plate, and

2. A synchronous double needle sewing machine according to claim 1, wherein the double needle head comprises a head mount, a double needle mechanism and a needle-shifting mechanism, the head mount being connected to the first output of the synchronous transmission; the double-needle mechanism and the needle shifting mechanism are arranged in the headstock, the double-needle handpiece comprises a needle rod and a first needle head and a second needle head which are arranged at the lower end of the needle rod, and the first needle head and the second needle head extend out of the lower part of the headstock; the needle shifting mechanism is connected with and drives the needle rod to simultaneously drive the first needle head and the second needle head to do reciprocating axial motion along the Z axis.

3. The synchronous double-needle sewing machine according to claim 2, wherein the needle-setting mechanism comprises a needle-setting driver, a needle-setting output shaft, a needle-setting dial, a needle-setting connecting rod, a needle-setting guide rail and a needle-setting slider, the needle-setting guide rail is fixedly arranged on the headstock, the needle-setting slider is slidably connected to the needle-setting guide rail and is fixedly connected with the needle bar, and the needle-setting driver drives the needle-setting dial to rotate through the connection of the needle-setting output shaft; one end of the needle poking connecting rod is rotatably connected to a circumferential point of the needle poking turntable, and the other end of the needle poking connecting rod is rotatably connected to the needle poking sliding block, so that the rotation of the needle poking turntable is converted into the sliding of the needle poking sliding block, and the needle rod is driven to axially reciprocate along the Z axis.

4. The synchronous double-needle sewing machine according to claim 2, wherein the double-needle head further comprises a presser foot mechanism arranged in the head seat, the presser foot mechanism comprises a presser foot driver, a presser foot output shaft, a presser foot transmission linkage, a presser foot rod and a presser foot, the presser foot is fixedly arranged on the presser foot rod, extends to the lower part of the first needle head and the second needle head, and is provided with a first via hole and a second via hole corresponding to the first needle head and the second needle head respectively; the presser foot driver is connected and drives the presser foot rod to drive the presser foot to lift along the Z axis through the presser foot output shaft and the presser foot transmission connecting rod group in sequence.

5. The synchronous two-needle sewing machine of claim 2, wherein the two-needle head further comprises a thread running mechanism disposed outside the head mount for defining a thread running path for the two sewing threads entering the two-needle mechanism; walk the line mechanism and include two and go up thread trappers, two thread trappers and a tensioner down, twice trough has on the tensioner, go up the one-to-one between thread trapper, lower thread trapper and the trough, two sets of thread trappers, lower thread trapper and trough are corresponding to the entering respectively the sewing line of first syringe needle and second syringe needle.

6. The synchronous double-needle sewing machine according to claim 1, wherein the double-shuttle device comprises a shuttle table rotating disc, a needle plate base plate, a rotating shuttle driver, a driving gear, two first adjusting gears, a first rotating shuttle and a second rotating shuttle, wherein the needle plate base plate synchronously rotates along with the shuttle table rotating disc, and the shuttle table rotating disc is connected with a second output end of the synchronous transmission device; the needle plate backing plate is positioned in the center of the shuttle race turntable and is provided with a first needle hole and a second needle hole which respectively correspond to the first needle head and the second needle head, and the first rotating shuttle and the second rotating shuttle are respectively positioned on two sides of the needle plate backing plate; one of the two first adjusting gears is connected between the driving gear and the first rotating shuttle, and the other one of the two first adjusting gears is connected between the driving gear and the second rotating shuttle; the rotating shuttle driver is connected with and drives the driving gear to rotate, and then the first rotating shuttle and the second rotating shuttle are driven to synchronously rotate through the transmission of the two first adjusting gears so as to respectively hook the sewing threads in the first needle hole and the second needle hole to form a thread loop.

7. The synchronous double-needle sewing machine according to claim 6, wherein the double-shuttle device further comprises a tangent line driver with a top rod, a driven gear, a first movable knife, a second movable knife and two second adjusting gears, wherein the tangent line driver synchronously rotates along with the rotating disc of the shuttle table, the first movable knife corresponds to the first rotating shuttle, and the second movable knife corresponds to the second rotating shuttle; one of the two second adjusting gears is connected between the driven gear and the first movable knife, and the other one of the two second adjusting gears is connected between the driven gear and the second movable knife; when the vertical column is located at the initial position, the ejector rod in the tangent line driver extends out to push the vertical column to the tangent position so as to push the driven gear to rotate forward for a certain angle, and then the first movable knife and the second movable knife synchronously rotate through the transmission of the two second adjusting gears so as to respectively cut off the sewing lines in the first rotating shuttle and the second rotating shuttle.

8. The synchronous double-needle sewing machine according to claim 7, wherein the double-shuttle device further comprises a cam, a thread cutting seat, a thread cutting slide bar, a thread cutting connecting rod, a driven gear, two second adjusting gears, a first movable knife and a second movable knife which rotate synchronously along with the rotating disc of the shuttle bed, wherein the first movable knife corresponds to the first rotating shuttle, and the second movable knife corresponds to the second rotating shuttle; the cam is coaxially connected with the driving gear, and the thread cutting seat is arranged below the needle plate base plate; the line cutting slide rod penetrates through the line cutting seat, one end of the line cutting slide rod faces the cam, and the other end of the line cutting slide rod faces the driven gear; one end of the tangent connecting rod is rotatably connected to one end, facing the driven gear, of the tangent sliding rod, and the other end of the tangent connecting rod is rotatably connected to the circumference of the driven gear; one of the two second adjusting gears is connected between the driven gear and the first movable knife, and the other one of the two second adjusting gears is connected between the driven gear and the second movable knife; when the cam rotates synchronously along with the driving gear, the cam can push the tangent slide rod to slide for a certain distance towards the driven gear, so that the driven gear rotates forwards for a certain angle through the transmission of the tangent connecting rod, and the first movable knife and the second movable knife rotate synchronously through the transmission of the two second adjusting gears, so that the first movable knife and the second movable knife cut off sewing threads in the first rotating shuttle and the second rotating shuttle respectively.

9. The synchronous double-needle sewing machine according to claim 1, wherein the double-shuttle device further comprises a reset driver with a push rod which synchronously rotates along with the shuttle table rotating disc, and a vertical column is arranged on the circumference of the driven gear; when the vertical column of the driven gear is positioned at the tangent line position, the ejector rod in the reset driver extends out to push the vertical column back to the initial position so as to push the driven gear to rotate reversely for a certain angle, and then the first movable cutter and the second movable cutter synchronously reset and rotate through the transmission of the two second adjusting gears.

10. The synchronous double-needle sewing machine according to claim 9, wherein the outer wall surface of the synchronous drive rod is further provided with a locking hole, and the synchronous drive device further comprises a locking block and a locking driver connected to drive the locking block to be inserted into or pulled out of the locking hole.