CN210458549U

CN210458549U - Double-needle longitudinal color changing computer pattern sewing machine

Info

Publication number: CN210458549U
Application number: CN201921349635.7U
Authority: CN
Inventors: 林强华
Original assignee: Shanghai Boao Electrical And Mechanical Manufacturing Co ltd
Current assignee: Shanghai Boao Electrical And Mechanical Manufacturing Co ltd
Priority date: 2019-08-19
Filing date: 2019-08-19
Publication date: 2020-05-05
Anticipated expiration: 2029-08-19

Abstract

The utility model belongs to the technical field of sewing equipment, in particular to a double-needle longitudinal color changing computer pattern sewing machine for clothing and shoemaking, which comprises a machine head, an upper shaft transmission mechanism, a double-needle longitudinal color changing mechanism, a middle presser foot transmission mechanism, a double-line thread clamping device, a thread hooking device, a sleeve and a front cover, wherein the sleeve is arranged at the front part of the machine head; compared with the prior art, the utility model, the design is simple, and it is convenient to make, and is with low costs, and the performance is good, can extensively use widely, and it is complicated to have solved the structure that traditional horizontal needle changing machine constructs or vertically needle changing machine constructs to exist, and manufacturing cost is big, and the installation and debugging degree of difficulty is high, and the maintenance rate is high, can't use widely scheduling problem.

Description

Double-needle longitudinal color changing computer pattern sewing machine

[ technical field ]

The utility model belongs to the technical field of sewing equipment, in particular to a double-needle longitudinal color changing computer pattern sewing machine for clothing and shoemaking.

[ background art ]

The sewing equipment with double needles and multiple needles is mostly provided with a transverse needle changing mechanism, and the purpose of needle changing is to change colors. In the eighties, a pan rod motor is adopted to drive a transverse multi-needle changing mechanism as an embroidery machine. In the nineties, foreign advanced sewing machine manufacturers designed a double-needle transverse needle changing machine for the clothing industry by using a computer pattern machine. Recently, a three-needle rotary type needle changing machine is also developed in China. In the early 20 s, the domestic noble clothing sewing equipment company develops a double-needle longitudinal needle changing computer pattern sewing machine, wherein the double-needle longitudinal needle changing is driven by an air cylinder, the driving of a needle bar of a machine needle is realized by adopting a double-needle machine needle bar clutch, and the reciprocating motion of the needle bar is realized by impacting a clutch lock catch by a firing pin during the work.

The transverse needle changing mechanism or the longitudinal needle changing mechanism belongs to a machine type with a complex structure, and due to the restriction of increasing of the complex coefficient of the mechanism, the use safety coefficient of the machine type is reduced, so that not only are a lot of difficulties increased in manufacturing, installation and debugging of the machine type, the maintenance rate is increased, but also the manufacturing cost is increased, and each machine type is sold at a price of more than 15 ten thousand yuan, which affects the wide application and popularization of the machine type.

[ contents of utility model ]

The utility model aims at solving foretell not enough and providing a double needle vertically trades look computer style machine, the design is simple, and it is convenient to make, and is with low costs, and the performance is good, can extensively use widely, and it is complicated to have solved the structure that traditional horizontal needle changing mechanism or vertical needle changing mechanism exists, and manufacturing cost is big, and the installation and debugging degree of difficulty is high, and the maintenance rate is high, unable using widely scheduling problem.

The double-needle longitudinal color changing computer pattern sewing machine comprises a machine head 1, an upper shaft transmission mechanism A, a double-needle longitudinal needle changing mechanism B, a middle presser foot transmission mechanism C, a double-thread wire clamping device D, a wire hooking device E, a sleeve 49 and a front cover 50, wherein the sleeve 49 is arranged at the front part of the machine head 1, the front end of the sleeve 49 is provided with the front cover 50, the upper shaft transmission mechanism A is arranged at the rear part of the machine head 1, the front end of the upper shaft transmission mechanism A is connected with the middle presser foot transmission mechanism C, the double-needle longitudinal needle changing mechanism B is arranged at the right lower side of the front face of the machine head 1, the double-thread wire clamping device D is arranged at the right side of the machine head 1, and the wire hooking device E is arranged at the.

Further, the upper shaft transmission mechanism A comprises an upper shaft 2, an upper shaft crank 3, a thread take-up lever assembly 4, a needle rod connecting rod 5 and a sliding block base 6, the front end of the upper shaft 2 is connected with the thread take-up lever assembly 4 through the upper shaft crank 3, the needle rod connecting rod 5 is connected below the thread take-up lever assembly 4, a needle rod linkage sliding block 7 is arranged below the needle rod connecting rod 5, a sliding block shaft pin 8 is inserted into a sliding block shaft hole of the needle rod connecting rod 5 and a sliding block shaft hole of the needle rod linkage sliding block 7, and the sliding block shaft pin 8 is fixed with a lower hole of the needle rod connecting rod 5.

Furthermore, the number of take-up lever holes in the head of the take-up lever component 4 is increased to two, two corners of a notch of the slider base 6 are set to be V-shaped, a stopper iron is arranged on the left side of the slider base 6, a corner extending body extending along the y direction is arranged on the right side of a slider shaft hole of the needle rod linkage slider 7, the extending length of the corner extending body is parallel to the level of the hole position of the needle rod, and the left side of the head of the corner extending body is provided with the y direction notch.

Further, the double-needle longitudinal needle changing mechanism B comprises a support connecting strip 10, the support connecting strip 10 is fixed on the right side of the machine head 1, a needle changing support 13 is fixed on the support connecting strip 10, the needle changing support 13 is designed into a U-shaped frame body, a needle bar seat 14 is arranged in the needle changing support 13, two needle bar holes parallel to the y direction are formed in the longitudinal left side of the needle bar seat 14, a needle bar 15 penetrates through the needle bar hole, the needle bar 15 penetrates out of the top of the needle bar seat 14, a screw cover 16 is arranged in an inner hole in the top of the needle bar 15, a compression spring 17 is sleeved on the lower portion of the screw cover 16, a needle bar anchor ear 18 is fixed on the needle bar 15 at the upper portion of the cavity of the needle bar seat 14, the anchor ear 18 is used for accurately positioning the hook thread height of the needle bar 15, a needle bar clutch anchor ear 18a is arranged below the needle bar 18, two symmetrical y direction shaft holes are arranged on the, an axial linear bearing 19 is installed in the y-direction shaft hole, a needle changing cylinder 20 is installed in the middle of the front face of the needle changing support 13, a piston rod of the needle changing cylinder 20 is connected with a needle rod seat 14 through a screw rod 21 and locked through a nut, and two positioning screws 22a are symmetrically arranged on the side of the needle changing support 13 in a lateral direction.

Further, the front of leg joint strip 10 is equipped with two waist shape mounting holes of arranging from top to bottom, leg joint strip 10 passes through waist shape mounting hole and fixes at aircraft nose 1 right side with screw 11, two symmetrical waist shape holes are seted up to leg joint strip 10 right side, leg joint strip 10 passes through waist shape hole and the fixed needle support 13 that trades of hexagon socket head cap screw 12.

Further, the middle presser foot transmission mechanism C comprises a cam 23, the cam 23 is mounted at the front part of the upper shaft 2, a connecting rod 24 is connected to the cam 23, the connecting rod 24 is driven by the cam 23 to perform a transverse reciprocating motion, the other end of the connecting rod 24 is connected with a pressing arm 25 arranged on the side surface of the machine head 1, the pressing arm 25 is driven by the connecting rod 24 to perform a reciprocating motion, the other end of the pressing arm 25 is connected with a gap connecting rod a26, a gap connecting rod C28, a gap connecting rod B27 and a connecting plate 29, the gap connecting rod B27 is connected with a pressing rod 31 through a pressing rod joint 30, the other end of the pressing rod 31 is connected with a middle presser foot 32, and the pressing rod 31 and the middle presser foot 32 perform an up-down reciprocating motion.

Further, double-wire thread clamping device D includes mounting panel 34, crosses line board 35, thread clamping device a36, thread clamping device B37, thread releasing device a38, thread releasing device B39, thread passing guide plate 40, thread take-up spring thread passing device 41, thread passing board 35 is installed on the mounting panel 34 top, thread clamping device a36, thread clamping device B37, thread releasing device a38, thread releasing device B39, thread taking-up spring thread passing device 41 are installed on mounting panel 34, thread releasing electromagnet 42 is installed at the back of thread releasing device a38 and thread releasing device B39, thread releasing electromagnet 42 is installed at the back of mounting panel 34 through the connecting plate, thread releasing device B39 one side is equipped with thread passing guide plate 40, thread passing guide plate 40 is fixed on mounting panel 34.

Further, collude traditional thread binding putting E and include mounting bracket 44, install a piston rod nonrotatable cylinder 45 on the mounting bracket 44, the piston rod head of cylinder 45 is equipped with a line and colludes 46, the side of mounting bracket 44 is equipped with a thread clamping ring frame 47, be equipped with a wool in the intra-ring of thread clamping ring frame 47 head and paste ring 48, the flexible action of cylinder 45 catches on and presss from both sides the facial line end of facial line in wool pastes ring 48.

Compared with the prior art, the utility model provides a design is simple, rational in infrastructure, it is convenient to make, and is with low costs, and the performance is good, the double needle that can extensively use widely vertically trades look computer style machine, and this model can trade the automatic pocket of look to the double needle very much and carry out supporting use, and it is complicated to have solved the structure that traditional horizontal needle changing mechanism or vertical needle changing mechanism exist, and manufacturing cost is big, and the installation and debugging degree of difficulty is high, and the maintenance rate is high, unable using widely scheduling problem.

[ description of the drawings ]

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic structural view of the head portion of FIG. 1;

FIG. 3 is a schematic structural view of the upper shaft transmission mechanism of FIG. 1;

FIG. 4 is a schematic view of the assembled structure of the double needle longitudinal direction changing mechanism of FIG. 1;

FIG. 5 is a schematic structural view of the drive structure of the middle presser foot of FIG. 1;

FIG. 6 is a schematic structural view of the two-wire binder of FIG. 1;

FIG. 7 is a schematic structural view of the thread hooking device in FIG. 1;

in the figure: 1. the needle bar changing machine comprises a machine head 2, an upper shaft 3, an upper shaft crank 4, a thread take-up lever component 5, a needle bar connecting rod 6, a sliding block base 7, a needle bar linkage sliding block 8, a sliding block shaft pin 9, a set screw 10, a support connecting strip 11, a screw 12, an inner hexagon screw 13, a needle changing support 14, a needle bar seat 15, a needle bar 16, a screw cover 17, a compression spring 18, a needle bar hoop 18a clutch hoop 19, an axial linear bearing 20, a needle changing cylinder 21, a screw rod 22, a nut 22a, a positioning screw 23, a cam 24, a connecting rod 25, a pressure arm 26, a gap connecting rod A27, a gap connecting rod B28, a gap connecting rod C29, a connecting plate 30, a pressure rod joint 31, a pressure rod 32, a middle pressure foot 33, a shaft screw 34, a mounting plate 35, a thread passing plate 36, the device comprises a thread loosening device A39, a thread loosening device B40, a thread passing guide plate 41, a thread picking spring thread passing device 42, a thread loosening electromagnet 44, a mounting rack 45, a cylinder 46, a thread hook 47, a thread clamping ring frame 48, a wool sticking ring 49, a front sleeve 50, a front cover A, an upper shaft transmission mechanism B, a double-needle longitudinal needle changing mechanism C, a middle presser foot transmission mechanism D, a double-thread clamping device E and a thread hooking device.

[ detailed description of the invention ]

The invention is further described below with reference to the accompanying drawings:

as shown in the attached drawing 1, the utility model provides a double needle vertically trades look computer style machine, by a style aircraft nose 1 of transformation of system, a set of upper shaft drive mechanism A, a set of double needle vertically trades needle mechanism B, presser foot drive mechanism C in a set of, constitute such as a set of double-line thread gripper D and a thread hooking device E, 1 front portion of aircraft nose is equipped with a sleeve 49, the sleeve 49 front end is equipped with a protecgulum 50, upper shaft drive mechanism A sets up at aircraft nose 1 rear portion, upper shaft drive mechanism A front end is connected with middle presser foot drive mechanism C, double needle vertically trades needle mechanism B and sets up at aircraft nose 1 front right side downside, double-line thread gripper D sets up the right side at aircraft nose 1, thread hooking device E sets up the left side lower part at aircraft nose 1.

As shown in the attached figure 2, the shaft plane is arranged on the front surface of the machine head 1, the thread take-up lever hole plane is respectively processed inwards to a depth of 12mm, the guide rail plane is washed inwards to a depth of 11mm, a notch with a width of 35mm and a depth of 50mm is arranged rightwards at a position 1mm below the hole edge of the pressing lever below the right side of the front surface of the machine head 1, a strip with a width of 24mm is arranged at the top of the notch, the notch with a depth of 50mm and a allowance with the top are 10mm, and the thread take-up long groove on the right side of the.

As shown in the attached drawing 3, the utility model discloses keep former style machine upper shaft drive mechanism A, this upper shaft drive mechanism A includes upper shaft 2, upper shaft crank 3, thread take-up lever subassembly 4, needle bar connecting rod 5, slider base 6, the upper shaft 2 front end is connected thread take-up lever subassembly 4 through upper shaft crank 3, thread take-up lever subassembly 4 below is connected with needle bar connecting rod 5, needle bar connecting rod 5 below is equipped with needle bar linkage slider 7, slider pivot 8 has been inserted in the slider pivot of the slider connecting hole of needle bar connecting rod 5 and needle bar linkage slider 7, slider pivot 8 is fixed with needle bar connecting rod 5 lower hole by holding screw 9; the line-taking-up rod hole of 4 heads of line-taking-up rod subassembly increases to two, and two bights in 6 notches of slider base set up to the V-arrangement, and 6 left sides of slider base are equipped with a stopper iron, and the slider shaft hole right side of needle bar linkage slider 7 is equipped with one along the turning extension body of y to extension, and the extension length and the needle bar hole site parallel and level of turning extension body have been seted up y to the notch in turning extension body head left side.

In the upper shaft transmission mechanism A, the head part of an upper shaft 2 is shortened by 12mm compared with the original upper shaft, a crank connecting hole opening is moved backwards by 12mm, the number of thread take-up rod holes at the head part of a thread take-up rod component 4 is increased to 2, the two sides of a slider connecting hole of a needle rod connecting rod 5 are respectively thinned by 2mm, a threaded hole is additionally arranged at 45 degrees in the lateral direction, two corner parts of a slot of a slider base 6 are V-shaped, a stopper is arranged at the left side, and the hole position plane is reduced by 4.5mm, the key point of the utility model is that a special needle rod linkage slider 7 is additionally arranged, a sliding body of the needle rod linkage slider 7 is twice longer than the original slider, two corner parts are V-shaped, a shaft hole is arranged in the y direction of the slider, a y direction corner extension body is arranged at 15mm of the right side of the shaft hole, the extension length of the y direction corner extension body is parallel and level with the hole position of the original needle rod, is fixed with the lower hole of the needle bar connecting rod 5 by a set screw 9.

As shown in figure 4, the double-needle longitudinal needle changing mechanism B comprises a support connecting strip 10, the support connecting strip 10 is fixed on the right side of the machine head 1, a needle changing support 13 is fixed on the support connecting strip 10, the needle changing support 13 is designed into a U-shaped frame body, a needle bar seat 14 is arranged in the needle changing support 13, two needle bar holes which are parallel in the y direction are arranged on the longitudinal left side of the needle bar seat 14, a needle bar 15 penetrates through the needle bar hole, the needle bar 15 penetrates out of the top of the needle bar seat 14, a screw cover 16 is arranged in the top inner hole of the needle bar 15, a compression spring 17 is sleeved on the lower part of the screw cover 16, a needle bar anchor ear 18 is fixed on the needle bar 15 on the upper part of the cavity of the needle bar seat 14, the needle bar anchor ear 18 is used for accurately positioning the height of a hooked thread of the needle bar 15, a needle bar clutch anchor 18a is arranged below the needle bar anchor ear 18, two symmetrical y-direction shaft holes are arranged on the right, a piston rod of the needle changing cylinder 20 is connected with the needle rod seat 14 through a screw 21 and locked through a nut, and two positioning screws 22a are symmetrically arranged on the lateral side of the needle changing support 13; the front of the support connecting strip 10 is provided with two waist-shaped mounting holes which are arranged up and down, the support connecting strip 10 is fixed on the right side of the machine head 1 through the waist-shaped mounting holes and the screws 11, the right side of the support connecting strip 10 is provided with two symmetrical waist-shaped holes, and the support connecting strip 10 is fixed with the needle changing support 13 through the waist-shaped holes and the inner hexagon screws 12.

Specifically, this vertical needle changing mechanism B of double needle sets up in aircraft nose 1 front right side downside, including a leg joint strip 10, two waist shape installation hole sites about two waist shape installation hole sites and fix at aircraft nose 1 right side by two screws 11 are established in the front of leg joint strip 10 distolaterally, and two waist shape hole sites of symmetry have also been seted up on the right side of leg joint strip 10, and by the fixed needle frame 13 that changes of two hexagon socket head cap screws 12, set up the purpose in two waist shape hole installation hole sites on the leg joint strip 10 and be used for adjusting the needle bar hole site of X to and y to. The needle changing bracket 13 is designed into a U-shaped frame body, the longitudinal left side of the frame is provided with a front pair of pin holes and a rear pair of pin holes which are symmetrical and are used for positioning cylindrical linear bearings, the inner cavity of the needle changing bracket 13 is provided with a needle bar seat 14, the longitudinal left side of the needle bar seat 14 is provided with two needle bar holes which are parallel in the y direction, the hole pitch of the two needle bars is 12mm, the right side of the longitudinal needle bar seat is provided with a rectangular cavity with the depth of 15mm, the two needle bars penetrate through the top of the needle bar seat 14 by 70mm, the top inner hole of the needle bar 15 is provided with a screw cover 16, the lower part of the screw cover is sleeved with a compression spring 17, a needle bar hoop 18 is fixed on the upper needle bar of the cavity of the needle bar seat 14 and is used for accurately positioning the height of a hook of the needle bar 15, a needle bar clutch hoop 18a is arranged below the needle bar hoop, the right side of the needle bar seat 14 is provided with two symmetrical shaft holes in the y direction, the head piston rod of the needle changing cylinder 20 is connected with a screw 21, is connected with the front needle rod seat 14 and is locked by a nut 22, and two positioning screws 22a are symmetrically arranged on the lateral side of the needle changing bracket 13.

As shown in fig. 5, the middle presser foot transmission mechanism C includes a cam 23, the cam 23 is installed at the front part of the upper shaft 2, a connecting rod 24 is connected to the cam 23, the cam 23 drives the connecting rod 24 to perform a transverse reciprocating motion, the other end of the connecting rod 24 is connected to a pressing arm 25 arranged at the side surface of the machine head 1, the pressing arm 25 is driven by the connecting rod 24 to perform a reciprocating motion, the other end of the pressing arm 25 is connected to a gap connecting rod a26, a gap connecting rod C28, a gap connecting rod B27 and a connecting plate 29, the gap connecting rod B27 is connected to a pressing rod 31 through a pressing rod joint 30, the other end of the pressing rod 31 is connected to the middle presser foot 32, and the pressing rod 31 and. The middle presser foot transmission mechanism C keeps the original brother type transmission principle, and mainly drives a connecting rod 24 to do the transverse reciprocating motion through a cam 23 at the warp part of an upper shaft 2, the connecting rod 24 is connected with a group of pressing arms 25 arranged at the side surface of a machine head 1 to do the reciprocating motion, the pressing arms 25 are connected with three gap connecting rods A26, a gap connecting rod C28, a gap connecting rod B27 and a connecting plate 29, and a pressing rod joint 30 is connected through a gap connecting rod B to enable a pressing rod 31 and a middle presser foot 32 to do the up-and-down reciprocating motion, the connection of all transmission pieces is connected with a full-shaft position screw 33, partial members are improved on the basis of completely keeping the original transmission principle, and the key point is that the length of the partial members is shortened, the partial members are controlled to be at the left position of the pressing rod 31, and a movable space is left for the double.

As shown in fig. 6, the double-wire gripper D adopts a commonly used double-needle machine gripper, and includes a mounting plate 34, a wire passing plate 35, a gripper a36, a gripper B37, a wire releasing device a38, a wire releasing device B39, a wire passing guide plate 40, and a wire picking spring wire passing device 41, wherein the wire passing plate 35 is mounted at the top end of the mounting plate 34, the gripper a36, the gripper B37, the wire releasing device a38, the wire releasing device B39, and the wire picking spring wire passing device 41 are mounted on the mounting plate 34, the wire releasing electromagnets 42 are mounted on the back surfaces of the wire releasing device a38 and the wire releasing device B39, the wire releasing electromagnets 42 are mounted on the back surface of the mounting plate 34 through a connecting plate, the wire passing guide plate 40 is arranged on one side of the wire releasing device B39, and the wire passing guide plate 40 is fixed. The thread clamping device is improved, and the key point of the thread clamping device is that two thread loosening electromagnets 42 are additionally arranged on the back surfaces of a thread loosening device A38 and a thread loosening device B39, so that a thread loosening mechanism arranged on an original pattern sewing machine is replaced, and the thread loosening electromagnets 42 are installed on the back surface of an installation version 34 through a connecting plate 43. The performance of the wire clamp is that the wire loosening device A38 and the wire loosening device B39 can be independently and electrically controlled to operate. When the thread take-up lever normally works, the two thread loosening devices both implement the function of clamping the upper thread, and the upper thread of the working machine needle cannot be separated from the inner hole of the machine needle.

As shown in fig. 7, the thread hooking device E is provided on the left side of the machine head 1, and is provided to replace a thread sweeping mechanism of an original pattern sewing machine, and it is necessary to perform thread hooking and clamping operations on an inoperative needle upper thread during a double thread sewing process, thereby preventing interference with the operative needle upper thread. The thread hooking device E comprises a mounting frame 44, a cylinder 45 with a non-rotatable piston rod is mounted on the mounting frame 44, a thread hook 46 is arranged at the head of the piston rod of the cylinder 45, a thread clamping ring frame 47 is arranged on the side face of the mounting frame 44, a wool sticking ring 48 is arranged in a ring at the head of the thread clamping ring frame 47, and when the cylinder 45 performs stretching and retracting actions during stretching and returning rapidly, the thread end of the upper thread is hooked and clamped in the wool sticking ring 48.

The utility model discloses a theory of operation does: when the upper shaft transmission mechanism A is in a high-position parking space, the thread take-up rod in the thread take-up rod assembly 4 is in the high-position parking space, at the moment, the two needle rods 15 arranged in the needle rod seat 14 are caused to be in a parking high position by resilience force of the compression spring 17, at the moment, one of the thread release electromagnets 42 is controlled by an electric control command to act to release the thread release device A38, thread trimming is commanded at the same time, and then the thread hooking device E is commanded to act and hook the needle thread end into the wool sticking ring 48 through the telescopic action of the air cylinder 45. At the moment, the electric control instruction upper shaft rotates to the highest parking position and instructs the double-needle longitudinal needle changing mechanism B to act, the needle bar seat 14 is pushed forward by 12mm through the extending action of the needle changing cylinder 20, and the clutch hoop 18 clamped on the needle bar 15 is separated from the y-direction notch in the needle bar linkage sliding block 7, so that the needle bar 15 is in a neutral position. Conversely, during the repeated evolution of the above-described action, the other needle bar 15 can be brought to the neutral position when the needle changing cylinder 20 is retracted. The utility model discloses the working procedure is realized through the linkage of above-mentioned A, B, C, D, E mechanism.

The present invention is not limited by the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and are all included in the protection scope of the present invention.

Claims

1. A double-needle longitudinal color changing computer pattern sewing machine is characterized in that: the double-needle longitudinal needle changing mechanism comprises a machine head (1), an upper shaft transmission mechanism (A), a double-needle longitudinal needle changing mechanism (B), a middle presser foot transmission mechanism (C), a double-thread wire clamping device (D), a wire hooking device (E), a sleeve (49) and a front cover (50), wherein the sleeve (49) is arranged at the front part of the machine head (1), the front end of the sleeve (49) is provided with the front cover (50), the upper shaft transmission mechanism (A) is arranged at the rear part of the machine head (1), the front end of the upper shaft transmission mechanism (A) is connected with the middle presser foot transmission mechanism (C), the double-needle longitudinal needle changing mechanism (B) is arranged at the right lower side of the front face of the machine head (1), the double-thread wire clamping device (D) is arranged at the right side of the machine head (1), and the wire hooking.

2. The double-needle longitudinal color changing computer pattern sewing machine of claim 1, characterized in that: the upper shaft transmission mechanism (A) comprises an upper shaft (2), an upper shaft crank (3), a take-up lever assembly (4), a needle bar connecting rod (5) and a slider base (6), wherein the front end of the upper shaft (2) is connected with the take-up lever assembly (4) through the upper shaft crank (3), the needle bar connecting rod (5) is connected below the take-up lever assembly (4), a needle bar linkage slider (7) is arranged below the needle bar connecting rod (5), a slider shaft pin (8) is inserted into a slider connecting hole of the needle bar connecting rod (5) and a slider shaft hole of the needle bar linkage slider (7), and the slider shaft pin (8) is fixed with the lower hole of the needle bar connecting rod (5) through a set screw (9.

3. The double-needle longitudinal color changing computer pattern sewing machine of claim 2, characterized in that: the line picking rod hole of line picking rod subassembly (4) head increases to two, two bights of slider base (6) notch set up to the V-arrangement, slider base (6) left side is equipped with a stopper iron, the slider shaft hole right side of needle bar linkage slider (7) is equipped with one along the corner extension body of y to extension, the stretching out length and the needle bar hole site parallel and level of corner extension body, y has been seted up to the notch to corner extension body head left side.

4. The double-needle longitudinal color changing computer pattern machine as claimed in claim 2 or 3, wherein: the double-needle longitudinal needle changing mechanism (B) comprises a support connecting strip (10), the support connecting strip (10) is fixed on the right side of the machine head (1), a needle changing support (13) is fixed on the support connecting strip (10), the needle changing support (13) is designed into a U-shaped frame body, a needle bar seat (14) is arranged in the needle changing support (13), two y-direction parallel needle bar holes are formed in the longitudinal left side of the needle bar seat (14), a needle bar (15) penetrates through the needle bar holes, the needle bar (15) penetrates out of the top of the needle bar seat (14), a screw cover (16) is arranged in the top inner hole of the needle bar (15), a compression spring (17) is sleeved on the lower portion of the screw cover (16), a needle bar hoop (18) is fixed on the needle bar (15) on the upper portion of a cavity of the needle bar seat (14), and the needle bar hoop (18) is used for accurately positioning the height of a needle bar (15) hook line, needle bar staple bolt (18) below is equipped with a needle bar separation and reunion staple bolt (18a), y that needle bar seat (14) right side was equipped with two symmetries is to the shaft hole, y installs axial linear bearing (19) in to the shaft hole, the positive mid-mounting of trading needle support (13) has needle changing cylinder (20), and the piston rod of needle changing cylinder (20) passes through screw rod (21) and connects needle bar seat (14) and lock through the nut, it is equipped with two set screw (22a) to trade needle support (13) side direction symmetry.

5. The double-needle longitudinal color changing computer pattern sewing machine of claim 4, wherein: the front of leg joint strip (10) is equipped with two waist shape mounting holes of arranging from top to bottom, leg joint strip (10) are fixed in aircraft nose (1) right side distolaterally through waist shape mounting hole and screw (11), the waist shape hole of two symmetries is seted up on leg joint strip (10) right side, leg joint strip (10) are through waist shape hole and interior hexagonal screw (12) fixed needle change support (13).

6. The double-needle longitudinal color changing computer pattern sewing machine of claim 5, wherein: the middle presser foot transmission mechanism (C) comprises a cam (23), the cam (23) is arranged at the front part of the upper shaft (2), the cam (23) is connected with a connecting rod (24), the cam (23) drives the connecting rod (24) to do transverse reciprocating motion, the other end of the connecting rod (24) is connected with a pressure arm (25) arranged on the side surface of the machine head (1), the pressure arm (25) is driven by the connecting rod (24) to do reciprocating swing action, the other end of the pressure arm (25) is connected with a gap connecting rod A (26), a gap connecting rod C (28), a gap connecting rod B (27) and a connecting plate (29), the gap connecting rod B (27) is connected with a pressing rod (31) through a pressing rod joint (30), the other end of the pressing rod (31) is connected with a middle presser foot (32), and the pressing rod (31) and the middle presser foot (32) are driven by the gap connecting rod B (27) to do reciprocating motion up and down.

7. The double-needle longitudinal color changing computer pattern sewing machine of claim 6, characterized in that: double-line thread trapper (D) include mounting panel (34), cross line board (35), thread trapper A (36), thread trapper B (37), thread release ware A (38), thread release ware B (39), cross line deflector (40), take-up spring and cross line ware (41), mounting panel (34) top is installed and is crossed line board (35), thread trapper A (36), thread trapper B (37), thread release ware A (38), thread release ware B (39), take-up spring cross line ware (41) and install on mounting panel (34), the back-mounted of thread release ware A (38) and thread release ware B (39) has thread release electro-magnet (42), the back at mounting panel (34) is installed through the connecting plate in thread release electro-magnet (42), thread release ware B (39) one side is equipped with and crosses line deflector (40), cross line deflector (40) and fix on mounting panel (34).

8. The double-needle longitudinal color changing computer pattern sewing machine of claim 7, wherein: collude traditional thread binding putting (E) and include mounting bracket (44), install a piston rod non-rotatable cylinder (45) on mounting bracket (44), the piston rod head of cylinder (45) is equipped with a thread and colludes (46), the side of mounting bracket (44) is equipped with a thread clamping ring frame (47), the intra-annular of thread clamping ring frame (47) head is equipped with a wool and pastes ring (48), the flexible action of cylinder (45) catches on and presss from both sides the facial line end of facial line in wool pastes ring (48).