CN219586329U - Multi-needle double-head shuttleless slitting sewing machine - Google Patents

Abstract

The utility model discloses a multi-needle double-head shuttleless slitting sewing machine which comprises a machine base, wherein a pattern sewing mechanism capable of sewing patterns on cloth is fixedly arranged on the machine base, a straight-line selvedge sewing mechanism for sewing the edge of the slitting cloth is movably arranged on the machine base, the front end of the pattern sewing mechanism is connected with a raw material transmission mechanism for fixing and rotating and conveying the cloth, the rear end of the straight-line selvedge sewing mechanism is connected with a finished product slitting mechanism for dividing the sewn cloth into strips and collecting the strips, and the pattern sewing mechanism is directly connected with the straight-line selvedge sewing mechanism in a transmission manner. The multi-needle double-head shuttleless slitting sewing machine adopts the shuttleless sewing machine with the slitting cutters at the two heads for pattern sewing and selvedge sewing, thereby reducing the occupied area, lowering the cost and improving the production efficiency.

Description

Multi-needle double-head shuttleless slitting sewing machine

Technical Field

The utility model relates to the field of sewing machines, in particular to the field of traditional multi-needle shuttleless split-stripe sewing machines.

Background

When the existing traditional shuttleless loom processes pattern cloth strips, two shuttleless shuttles are needed, one of the shuttleless shuttles is used for sewing patterns, the other one of the shuttleless shuttles is used for sewing the split cloth edges, the split cloth edges are cut into split strips after the sewing is finished, and a cloth guide hopper is further needed to be added between the two shuttleless shuttles, so that the shuttleless loom is large in occupied area, high in input cost and low in production efficiency. Therefore, a shuttleless loom with a double-head belt slitting cutter for pattern sewing and selvedge sewing needs to be designed, the working principle of the traditional sewing machine is adopted by the pattern sewing part, and the selvedge sewing part is connected by a plurality of groups of deflection mechanisms to realize up-down, front-back and left-right swinging so as to finish the sewing work, so that the function of one loom is equivalent to that of the traditional two shuttleless slitting sewing, the occupied area is reduced, the cost is reduced, and the simple and convenient structure of the production efficiency is improved.

Accordingly, there is a need for further improvement in the prior multi-needle shuttleless split strip sewing machine.

Disclosure of Invention

The utility model aims to provide a multi-needle double-head shuttleless slitting sewing machine, which is a shuttleless sewing machine with a slitting cutter at the same time and has the advantages that the pattern sewing part adopts the working principle of the traditional sewing machine, and the selvedge sewing part is connected by a plurality of groups of deflection mechanisms to realize up-down, front-back and left-right movements so as to finish the sewing work, so that the function of one machine is equivalent to the function of the traditional two shuttleless slitting sewing machines, the occupied area is reduced, the cost is reduced, and the simple and convenient structure of the production efficiency is improved.

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

the multi-needle double-head shuttleless slitting sewing machine comprises a machine base, wherein a pattern sewing mechanism capable of sewing patterns on cloth is fixedly arranged on the machine base, a straight-line selvedge sewing mechanism capable of sewing a slitting cloth is movably arranged on the machine base, the front end of the pattern sewing mechanism is connected with a raw material transmission mechanism capable of fixing and rotating and conveying the cloth, the rear end of the straight-line selvedge sewing mechanism is connected with a finished product slitting mechanism capable of dividing the sewn cloth into strips and collecting the strips, and the pattern sewing mechanism is directly connected with the straight-line selvedge sewing mechanism in a transmission manner.

Further, the frame is including two sets of lower base, two sets of lower base top is provided with the fixing base, it all is provided with the fixed block to go up the fixing base both ends, two sets of fixed block one side is provided with adjusting part, and opposite side both ends are provided with two sets of guide rails.

Further, the pattern sewing mechanism comprises a sewing needle fixing seat arranged between the two groups of fixing blocks, a plurality of groups of needle sewing assemblies are arranged on one side of the sewing needle fixing seat, a conveying guide rod capable of enabling cloth to be smoothly conveyed to the linear selvedge sewing mechanism is arranged on the other side of the sewing needle fixing seat, and a cloth conveying mechanism is arranged on one side of the needle sewing assemblies.

Further, the straight line selvedge sewing mechanism is including setting up two sets of can controlling the removal frame that removes on the guide rail, every group be provided with multiunit bearing on the removal frame, be provided with the transmission shaft between the bearing, transmission shaft one end articulates there is the transmission synchronizing wheel, and the other end is provided with plectrum eccentric mechanism, one of them a set of be provided with servo motor on the removal frame, servo motor articulates there is the motor synchronizing wheel, the motor synchronizing wheel with be provided with the drive belt between the transmission synchronizing wheel, two sets of be provided with fixed beam between the removal frame, be provided with the sewing needle axis of rotation on the fixed beam, be provided with multiunit sewing needle subassembly in the sewing needle axis of rotation, sewing needle subassembly below is provided with the sewing faller, the sewing faller below is provided with the hook line subassembly, the transmission shaft with be provided with two sets of first crank mechanisms between the sewing needle axis of rotation, the transmission shaft with be provided with two sets of second crank mechanisms between the hook line subassembly.

Further, the raw material transmission mechanism comprises a cloth guide frame, a plurality of groups of cloth support frames are arranged on one side of the cloth guide frame, an adjusting work table is arranged on the other side of the cloth guide frame, and two groups of guide rotating shafts are arranged on one side of the adjusting work table.

Further, the finished product slitting mechanism comprises two groups of first fixing plates and one group of second fixing plates, wherein the two groups of first fixing plates and the one group of second fixing plates are arranged on the fixing cross beam, a first guide roller is arranged between the first fixing plates, one side of the first guide roller is provided with a cutter rotating shaft, a plurality of groups of cutting knives capable of slitting cloth are arranged on the cutter rotating shaft, the cutting knives are provided with second guide rollers, cloth pressing rollers are arranged above the second guide rollers, and a finished product recovery frame is arranged below the second guide rollers.

Further, the first crank mechanism comprises a needle bar eccentric wheel arranged on the transmission shaft and a needle bar transmission swing rod arranged on the sewing needle rotation shaft, and a needle bar transmission connecting rod is arranged between the needle bar eccentric wheel and the needle bar transmission swing rod.

Further, the second crank mechanism comprises a hook eccentric wheel arranged on the transmission shaft and a hook swing rod arranged on the hook wire assembly, and a hook connecting rod is arranged between the hook eccentric wheel and the hook swing rod.

Further, the sewing needle assembly comprises a first needle bar transmission swing rod arranged on a sewing needle rotating shaft, a second needle bar transmission swing rod is hinged to the first needle bar transmission swing rod, a swinging piece fixing block is arranged on the second needle bar transmission swing rod, a needle bar guide seat is arranged on one side of the swinging piece fixing block, needle bars are inserted into the needle bar guide seat, needle bars are arranged below the needle bars, and a plurality of groups of sewing needles are arranged on the needle bars.

Further, the plectrum eccentric mechanism is including setting up plectrum eccentric wheel and two sets of upper and lower settings on the transmission shaft are in plectrum pendulum rod shaft is provided with between the plectrum pendulum rod bearing fixing base of moving the frame, two sets of plectrum pendulum rod shaft, be provided with the plectrum on the pendulum rod shaft pendulum rod and the plectrum pendulum rod down, the plectrum down pendulum rod with be provided with first plectrum connecting rod between the plectrum eccentric wheel, the plectrum eccentric mechanism is still including setting up plectrum and the guide holder on the sewing faller, be provided with the guide block on the guide holder, guide block one side with the plectrum is connected, the opposite side with be provided with the second plectrum connecting rod between the plectrum on the plectrum pendulum rod.

In summary, compared with the prior art, the utility model has the following beneficial effects:

the structure of the utility model solves the defects of the existing multi-needle shuttleless slitting sewing machine, and has the advantages that the multi-needle double-head shuttleless slitting sewing machine adopts a shuttleless sewing machine with a slitting cutter at the two heads for pattern sewing and selvedge sewing, the pattern sewing part adopts the working principle of the traditional sewing machine, and the selvedge sewing part is connected by a plurality of groups of deflection mechanisms to realize up-down, front-back and left-right swinging so as to finish the sewing work, thereby leading the function of one machine to be equivalent to the function of the traditional two shuttleless slitting sewing, reducing the occupied area and the cost and improving the simple and convenient structure of the production efficiency.

Drawings

FIG. 1 is a perspective view of the present utility model;

FIG. 2 is an enlarged view of a portion of FIG. 1A in accordance with the present utility model;

FIG. 3 is an enlarged view of a portion of FIG. 1B in accordance with the present utility model;

FIG. 4 is a front view of the present utility model;

FIG. 5 is a perspective partial view of the present utility model;

FIG. 6 is a partial cross-sectional view of the present utility model;

FIG. 7 is an enlarged view of a portion of the utility model at D in FIG. 5;

FIG. 8 is an enlarged partial view of the utility model at E in FIG. 6;

fig. 9 is a schematic view of the cam eccentric mechanism 100 of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-9, the multi-needle double-head shuttleless slitting sewing machine comprises a machine base 1, wherein a pattern sewing mechanism 2 capable of sewing patterns on cloth is fixedly arranged on the machine base 1, a straight-line selvedge sewing mechanism 3 for sewing edge sealing of the slitting cloth is movably arranged on the machine base 1, the front end of the pattern sewing mechanism 2 is connected with a raw material transmission mechanism 4 for fixing and rotating and conveying the cloth, the rear end of the straight-line selvedge sewing mechanism 3 is connected with a finished product slitting mechanism 5 for dividing the sewn cloth into strips and collecting the strips, and the pattern sewing mechanism 2 is directly connected with the straight-line selvedge sewing mechanism 3 in a transmission manner.

The working flow is as follows:

the cloth with the required sewing pattern is placed on the raw material transmission mechanism 4, the cloth is pulled to the finished product slitting mechanism 5 to be fixed, then the machine is started, the raw material transmission mechanism 4 transmits the cloth to the pattern sewing mechanism 2, the pattern sewing mechanism 2 is used for sewing the required pattern on the cloth and then transmitting the pattern to the linear selvedge sewing mechanism 3 for edge banding sewing, the finished product slitting mechanism 5 is used for finished product slitting cutting after edge banding sewing is finished, finally the cloth is rolled up, pattern sewing and selvedge sewing are finished on the same machine, the complex process of selvedge sewing is not required to be performed on one sewing machine after the pattern is sewn on the other sewing machine, the functions of two machines are realized by one machine, the floor area of the machine is reduced, the cost is reduced, and the production efficiency is improved.

The machine base 1 comprises two groups of lower bases 101, an upper fixing seat 102 is arranged above the two groups of lower bases 101, fixing blocks 103 are arranged at two ends of the upper fixing seat 102, an adjusting component 104 is arranged at one side of each fixing block 103, and two groups of guide rails 105 are arranged at two ends of the other side of each fixing block 103.

The front side of the machine base 1 is the same as a traditional shuttleless slitting sewing machine, and is used for fixedly mounting part of conveying components of the pattern sewing mechanism 2, a motor, an adjusting component 104 and a raw material transmission mechanism 4, and a plurality of groups of guide rails 105 are arranged on the rear side of the machine base, so that the linear selvedge sewing mechanism 3 can move left and right on the machine base to be matched with the pattern sewing mechanism 2 for adjustment.

The pattern sewing mechanism 2 of the utility model comprises a sewing needle fixing seat 201 arranged between two groups of fixing blocks 103, a plurality of groups of needle sewing assemblies 202 are arranged on one side of the sewing needle fixing seat 201, a transmission guide rod 203 which can smoothly transmit cloth to the straight selvedge sewing mechanism 3 is arranged on the other side of the sewing needle fixing seat, and a cloth transmission mechanism 204 is arranged on one side of the needle sewing assemblies 202.

The pattern sewing mechanism 2 is mainly used for pattern sewing, and is the same as the working principle of a traditional shuttleless split strip sewing machine, and the needle sewing assembly 202 is driven by a motor to sew a required pattern on cloth and then smoothly transmits the pattern sewing required pattern to the linear selvedge sewing mechanism 3 through the transmission guide rod 203 to carry out edge sealing sewing on the cloth.

The linear selvedge sewing mechanism 3 comprises a movable base 301 which is arranged on two groups of guide rails 105 and can move left and right, a plurality of groups of bearings 3011 are arranged on each group of movable base 301, a transmission shaft 302 is arranged between the bearings 3011, one end of the transmission shaft 302 is hinged with a transmission synchronizing wheel 303, the other end of the transmission shaft is provided with a shifting piece eccentric mechanism 100, a servo motor 304 is arranged on one group of movable base 301, a motor synchronizing wheel 305 is hinged with the servo motor 304, a transmission belt 306 is arranged between the motor synchronizing wheel 305 and the transmission synchronizing wheel 303, a fixed cross beam 307 is arranged between the two groups of movable base 301, a sewing needle rotating shaft 308 is arranged on the fixed cross beam 307, a plurality of groups of sewing needle assemblies 309 are arranged on the sewing needle rotating shaft 308, a needle plate 310 is arranged below the sewing needle plate 310, a hook wire assembly 311 is arranged below the transmission shaft 302, two groups of first crank mechanisms 312 are arranged between the transmission shaft 302 and the sewing needle rotating shaft 308, and two groups of second crank mechanisms 313 are arranged between the transmission shaft 302 and the hook wire assembly 311.

The moving machine base 301 can move left and right on the guide rail 105 on the machine base 1 to achieve adjustment, when the linear selvedge sewing mechanism 3 works, the independent servo motor 304 rotates, the motor synchronous wheel 305 drives the transmission synchronous wheel 303 to rotate through the transmission belt 306, so that the transmission shaft 302 rotates, meanwhile, the transmission shaft 302 rotates and drives the first crank mechanism 312 and the second crank mechanism 313, the first crank mechanism 312 drives the sewing needle rotating shaft 308 to enable the sewing needle assembly 309 to work, the second crank mechanism 313 drives the hooking assembly 311 to work, and the shifting piece eccentric mechanism 100 arranged at the other end of the transmission shaft 302 also works along with the rotation of the transmission shaft 302.

The raw material transmission mechanism 4 comprises a cloth guide frame 401, wherein a plurality of groups of cloth support frames 402 are arranged on one side of the cloth guide frame 401, a work adjusting table 403 is arranged on the other side of the cloth guide frame, and two groups of guide rotating shafts 404 are arranged on one side of the work adjusting table 403.

The raw material transmission mechanism 4 is like a transmission sewing machine, and enables cloth to be conveyed forwards through rotation, operators stand on the machine adjustment workbench 403 to penetrate cloth, and machine positioning and pressure adjustment according to cloth width are more convenient.

The finished product slitting mechanism 5 comprises two groups of first fixing plates 501 and one group of second fixing plates 502 which are arranged on the fixing beam 307, a first guide roller 503 is arranged between the two groups of first fixing plates 501, a cutter rotating shaft 504 is arranged on one side of the first guide roller 503, a plurality of groups of cutting knives 505 capable of slitting cloth are arranged on the cutter rotating shaft 504, the cutting knives 505 are provided with second guide rollers 506, a cloth pressing roller 507 is arranged above the second guide rollers 506, and a finished product recovery frame 508 is arranged below the second guide rollers 506.

When the cloth passes through the finished product slitting mechanism 5, the slitting knife 505 cuts the cloth into strips, and the recovery rack 508 takes in the cut strips in a rolled manner.

The first crank mechanism 312 of the present utility model includes a needle bar eccentric 3121 disposed on the transmission shaft 302 and a needle bar transmission swing link 3122 disposed on the sewing needle rotation shaft 308, and a needle bar transmission link 3123 is disposed between the needle bar eccentric 3121 and the needle bar transmission swing link 3122.

When the transmission shaft 302 rotates, the movement track of the needle bar eccentric 3121 moves the needle bar transmission link 3123 up and down, and the needle bar transmission swing link 3122 and the sewing needle rotation shaft 308 also reciprocate with the needle bar transmission link 3123.

The second crank mechanism 313 of the present utility model includes a hook eccentric 3131 disposed on the transmission shaft 302 and a hook swing link 3132 disposed on the hook wire assembly 311, and a hook connecting rod 3133 is disposed between the hook eccentric 3131 and the hook swing link 3132.

When the transmission shaft 302 rotates, the motion track of the hook eccentric wheel 3131 enables the hook connecting rod 3133 to swing back and forth, and the swing rod 3132 and the hook wire assembly 311 swing back and forth.

The sewing needle assembly 309 comprises a first needle bar transmission swing rod 3091 arranged on a sewing needle rotating shaft 308, a second needle bar transmission swing rod 3092 is hinged on the first needle bar transmission swing rod 3091, a swinging piece fixing block 3093 is arranged on the second needle bar transmission swing rod 3092, a needle bar guide seat 3094 is arranged on one side of the swinging piece fixing block 3093, a needle bar 3095 is inserted into the needle bar guide seat 3094, a needle bar 3096 is arranged below the needle bar 3095, and a plurality of groups of sewing needles 3097 are arranged on the needle bar 3096.

When the sewing needle rotating shaft 308 rotates back and forth, the first needle bar transmission swinging rod 3091 is driven to move up and down, the second needle bar transmission swinging rod 3092 is driven to move up and down, the swinging piece fixing block 3093 and the needle bar 3095 are driven to move up and down in the needle bar guide seat 3094, and a plurality of groups of needle bars 3095 drive the needle bars 3096 and the sewing needles 3097 to move up and down.

The utility model relates to a shifting piece eccentric mechanism 100, which comprises a shifting piece eccentric wheel 1001 arranged on a transmission shaft 302, two groups of shifting piece swing rod bearing fixing seats 1002 which are arranged on a movable base 301 up and down, a shifting piece swing rod shaft 1003 arranged between the two groups of shifting piece swing rod bearing fixing seats 1002, a shifting piece upper swing rod 1004 and a shifting piece lower swing rod 1005 arranged on the shifting piece swing rod shaft 1003, a first shifting piece connecting rod 1006 arranged between the shifting piece lower swing rod 1005 and the shifting piece eccentric wheel 1001, a shifting piece 1007 arranged on a sewing needle plate 310, a guide seat 1008, a guide block 1009 arranged on the guide seat 1008, one side of the guide block 1009 is connected with the shifting piece, and a second shifting piece connecting rod 1010 arranged between the other side of the guide block 1009 and the shifting piece upper swing rod 1004.

When the transmission shaft 302 rotates, the first dial connecting rod 1006 is pushed and pulled back and forth due to the motion track of the dial eccentric wheel 1001, the first dial connecting rod 1006 is pushed and pulled back and forth to make the dial lower swing rod 1005 perform forward and backward rotation, the dial swing rod shaft 1003 and the dial upper swing rod 1004 are driven to perform forward and backward rotation, and the dial upper swing rod 1004 drives the dial 1007 and the second dial connecting rod 1010 to reciprocate on the guide seat 1008.

While there has been shown and described what is at present considered to be the fundamental principles and the main features of the utility model and the advantages thereof, it will be understood by those skilled in the art that the present utility model is not limited to the foregoing embodiments, but is described in the foregoing description merely illustrates the principles of the utility model, and various changes and modifications may be made therein without departing from the spirit and scope of the utility model as hereinafter claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (10)

1. Multi-needle double-head shuttleless slitting sewing machine is characterized in that: the automatic pattern sewing machine comprises a machine base (1), a pattern sewing mechanism (2) capable of sewing patterns on cloth is fixedly arranged on the machine base (1), a straight-line selvedge sewing mechanism (3) for sewing edges of the split cloth is movably arranged on the machine base (1), a raw material transmission mechanism (4) for fixing and rotating and conveying the cloth is connected to the front end of the pattern sewing mechanism (2), a finished product split mechanism (5) for dividing the sewn cloth into strips and collecting is connected to the rear end of the straight-line selvedge sewing mechanism (3), and the pattern sewing mechanism (2) is directly connected with the straight-line selvedge sewing mechanism (3) in a transmission mode.

2. The multi-needle, dual-head, shuttleless split-seam sewing machine of claim 1 wherein: the machine seat (1) comprises two groups of lower bases (101), an upper fixing seat (102) is arranged above the lower bases (101), fixing blocks (103) are arranged at two ends of the upper fixing seat (102), an adjusting assembly (104) is arranged on one side of each fixing block (103), and two groups of guide rails (105) are arranged at two ends of the other side of each fixing block.

3. The multi-needle, double-head, shuttleless split-seam sewing machine of claim 2 wherein: the pattern sewing mechanism (2) comprises sewing needle fixing seats (201) arranged between two groups of fixing blocks (103), a plurality of groups of needle sewing assemblies (202) are arranged on one side of each sewing needle fixing seat (201), a conveying guide rod (203) capable of smoothly conveying cloth to the linear selvedge sewing mechanism (3) is arranged on the other side of each sewing needle fixing seat, and a cloth conveying mechanism (204) is arranged on one side of each needle sewing assembly (202).

4. A multi-needle, dual-head shuttleless split-seam sewing machine as claimed in claim 3 wherein: the linear selvedge sewing mechanism (3) comprises two groups of movable bases (301) which are arranged on the guide rails (105) and can move left and right, a plurality of groups of bearings (3011) are arranged on each group of movable bases (301), a transmission shaft (302) is arranged between the bearings (3011), one end of the transmission shaft (302) is hinged with a transmission synchronous wheel (303), the other end of the transmission shaft is provided with a shifting piece eccentric mechanism (100), one group of the movable bases (301) is provided with a servo motor (304), the servo motor (304) is hinged with a motor synchronous wheel (305), a transmission belt (306) is arranged between the motor synchronous wheel (305) and the transmission synchronous wheel (303), a fixed cross beam (307) is arranged between the two groups of movable bases (301), a sewing needle rotating shaft (308) is arranged on the fixed cross beam (307), a plurality of groups of needle assemblies (309) are arranged on the sewing needle rotating shaft (308), needle plates (310) are arranged below the sewing needle assemblies (309), a hook line assembly (311) is arranged below the needle plates (310), a sewing rotating shaft (312) is arranged between the two groups of sewing rotating shafts (312), two groups of second crank mechanisms (313) are arranged between the transmission shaft (302) and the hooking component (311).

5. The multi-needle, double-head, shuttleless split-seam sewing machine of claim 4 wherein: the raw material transmission mechanism (4) comprises a cloth guide frame (401), a plurality of groups of cloth support frames (402) are arranged on one side of the cloth guide frame (401), an operation platform (403) of the regulator is arranged on the other side of the cloth guide frame, and two groups of guide rotating shafts (404) are arranged on one side of the operation platform (403) of the regulator.

6. The multi-needle, dual-head, shuttleless split-seam sewing machine of claim 5 wherein: finished product slitting mechanism (5) is including setting up two sets of first fixed plates (501) and a set of second fixed plate (502) on fixed crossbeam (307), two sets of be provided with first guide cylinder (503) between first fixed plate (501), first guide cylinder (503) one side is provided with cutter pivot (504), be provided with multiunit cutting knife (505) that can divide the cloth into the strips on cutter pivot (504), cutting knife (505) are provided with second guide cylinder (506), second guide cylinder (506) top is provided with cloth pressing roller (507), second guide cylinder (506) below is provided with finished product recovery frame (508).

7. The multi-needle, dual-head, shuttleless split-seam sewing machine of claim 6 wherein: the first crank mechanism (312) comprises a needle bar eccentric wheel (3121) arranged on the transmission shaft (302) and a needle bar transmission swing rod (3122) arranged on the sewing needle rotation shaft (308), and a needle bar transmission connecting rod (3123) is arranged between the needle bar eccentric wheel (3121) and the needle bar transmission swing rod (3122).

8. The multi-needle, dual-head, shuttleless split-seam sewing machine of claim 7 wherein: the second crank mechanism (313) comprises a hook eccentric wheel (3131) arranged on the transmission shaft (302) and a hook swing rod (3132) arranged on the hook wire assembly (311), and a hook connecting rod (3133) is arranged between the hook eccentric wheel (3131) and the hook swing rod (3132).

9. The multi-needle, dual-head, shuttleless split-seam sewing machine of claim 8 wherein: the sewing needle assembly (309) comprises a first needle bar transmission swing rod (3091) arranged on a sewing needle rotating shaft (308), a second needle bar transmission swing rod (3092) is hinged to the first needle bar transmission swing rod (3091), a swing piece fixing block (3093) is arranged on the second needle bar transmission swing rod (3092), a needle bar guide seat (3094) is arranged on one side of the swing piece fixing block (3093), a needle bar (3095) is inserted in the needle bar guide seat (3094), a needle bar (3096) is arranged below the needle bar (3095), and a plurality of groups of sewing needles (3097) are arranged on the needle bar (3096).

10. The multi-needle, dual-head, shuttleless split-seam sewing machine of claim 9 wherein: the automatic shifting device is characterized in that the shifting piece eccentric mechanism (100) comprises a shifting piece eccentric wheel (1001) arranged on the transmission shaft (302) and two groups of shifting piece swing rod bearing fixing seats (1002) arranged on the movable base (301) up and down, a shifting piece swing rod shaft (1003) is arranged between the shifting piece swing rod bearing fixing seats (1002), a shifting piece upper swing rod (1004) and a shifting piece lower swing rod (1005) are arranged on the shifting piece swing rod shaft (1003), a first shifting piece connecting rod (1006) is arranged between the shifting piece lower swing rod (1005) and the shifting piece eccentric wheel (1001), the shifting piece eccentric mechanism (100) further comprises a shifting piece (1007) and a guide seat (1008) arranged on the sewing needle plate (310), a guide block (1009) is arranged on the guide seat, one side of the guide block (1009) is connected with the shifting piece (1007), and a second shifting piece connecting rod (1010) is arranged between the shifting piece upper swing rod (1004).