Switching needle bar sewing machine

Abstract

The present invention relates to a switching needle bar sewing machine, comprising: an upper shaft, a needle bar holder, a movable cassette, a plurality of needle bars and a needle bar driving rod. The needle bar holder has a control guide groove for restricting the movement of the needle bar and an alignment space communicating with the control guide groove. The movable cassette can drive all the needle bars to move, so that one of the needle bars moves to the alignment space, while the remaining needle bars are engaged with the control guide groove. Wherein, the needle bar driving rod is located inside the alignment space to engage and align with the needle bar in the alignment space, so that the needle bar driving rod is located above the needle bar in the Z-axis direction. Furthermore, the needle bar driving rod and the needle bar in the alignment space are axially arranged. Thus, when the needle bar driving rod drives the needle bar in the alignment space to move up and down through the upper shaft, the needle bar driving rod can reduce the generation of a lateral component force whose acting direction is perpendicular to the needle bar, and further reduce the friction force between the needle bar and the needle bar holder.

Description

Technical Field

[0001] The present invention relates to a pattern sewing machine controlled by a computer, and particularly to a switching needle bar sewing machine capable of selectively replacing different needle bars for sewing operations. Background Art

[0002] A sewing machine mainly passes a sewing thread through several layers of sewing materials, enabling the several layers of sewing materials to be combined with each other through the sewing thread. Moreover, with the continuous evolution of required functions, sewing machines currently available on the market have various additional functions, and sewing machines with various additional functions can be applied to the sewing operation requirements of different sewing materials.

[0003] Currently, there are several pattern sewing machines on the market that can form a default pattern with multiple-color sewing threads on the surface of a sewing material. Among them, this type of pattern sewing machine is equipped with a movable needle bar magazine, and the needle bar magazine has multiple needle bars. Thus, the pattern sewing machine can switch different needle bars according to the default pattern, enabling the default pattern on the surface of the sewn object to present multiple colors. However, the pattern sewing machine drives the needle bar to move up and down through a needle bar driving rod rotating around an upper shaft. However, existing pattern sewing machines all set the needle bar driving rod at the lateral position of the needle bar, such that when the needle bar driving rod drives the needle bar to move up and down, a lateral component force perpendicular to the needle bar will be generated, and thus friction will be generated between the needle bar and the needle bar magazine, causing the service life of the needle bar to be shortened due to friction with the needle bar magazine. Summary of the Invention

[0004] The purpose of the present invention is to structurally improve the tensioning mechanism of the switching needle bar sewing machine, such that during the process of the two clamping units of the tensioning mechanism tightening a towel, one of the clamping unit and the towel can move relative to the other to change their relative positions, enabling the position where the towel is clamped by the clamping units to be changed. Thus, during the process of the towel being tightened by the two clamping units, the towel will not be torn by the two clamping units.

[0005] The main purpose of the present invention is to improve the relative position between the needle bar driving rod and the needle bar, such that when the needle bar driving rod drives the needle bar to reciprocate along the Z-axis through the rotating upper shaft, the needle bar driving rod can reduce the generation of a lateral component force perpendicular to the needle bar, thereby reducing the friction between the needle bar and the needle bar holder, and relatively improving the service life of the needle bar.

[0006] To achieve the foregoing purpose, the switching needle bar sewing machine of the present invention includes: a sewing body, a movable magazine, a needle bar holder, a needle bar driving rod, and multiple needle bars. Among them, the sewing body has an upper shaft parallel to the X-axis, the upper shaft can rotate, and the movable magazine is movably connected to the sewing body, such that the movable magazine can move.

[0007] The needle bar holder is fixed to the sewing body and has a control guide groove and an alignment space communicating with the control guide groove. The needle bar driving rod is aligned with the alignment space and can move along the Z-axis direction through the upper shaft. In addition, a plurality of needle bars are installed in the movable cartridge, and the plurality of needle bars can be respectively engaged with the control guide groove and the needle bar driving rod.

[0008] Wherein, the movable cartridge can drive all the needle bars to move, so that one of the needle bars moves to the alignment space to be engaged with the needle bar driving rod, so that the needle bar aligned with the alignment space can move along the Z-axis direction through the needle bar driving rod, and the remaining needle bars are engaged with the control guide groove and cannot move along the Z-axis direction. In addition, the needle bar driving rod is arranged at a position above the needle bar located in the alignment space along the Z-axis direction, so that the needle bar driving rod and the needle bar located in the alignment space are axially arranged.

[0009] In this embodiment, the needle bar has a connecting portion engaged with the control guide groove, the needle bar driving rod has an engaging portion capable of engaging with the connecting portion, and both the connecting portion and the engaging portion are located at a position above the needle bar along the Z-axis direction. Wherein, the engaging portion has an engaging space aligned with the control guide groove, and an engaging guide surface close to the control guide groove is provided inside the engaging space, and the engaging guide surface is used to guide the connecting portion into the inside of the engaging space. In addition, a control guide surface close to the engaging guide surface is provided inside the control guide groove, and the control guide surface is used to guide the connecting portion into the inside of the control guide groove.

[0010] The lateral widths of both the connecting portion and the engaging portion are smaller than the lateral width of the alignment space, so that both the connecting portion and the engaging portion can be located inside the alignment space. Moreover, the lateral width of the alignment space is greater than the lateral width of the needle bar driving rod, and the needle bar driving rod is located inside the alignment space, so that the needle bar driving rod can move inside the alignment space.

[0011] In a preferred embodiment, the switching needle bar sewing machine further has a thread clamping mechanism, a thread hooking mechanism, a plurality of thread take-up units, a thread take-up lever holder, and a thread take-up driving lever. Among them, the thread clamping mechanism mainly consists of a plurality of thread clamping units, a thread clamping driving unit, and a plurality of return springs. Each thread clamping unit has a fixed clamping member and a movable clamping member. The fixed clamping member is connected to the movable cassette, so that the movable cassette can drive the plurality of thread clamping units to move. The movable clamping member is movably connected to the fixed clamping member, so that the movable clamping member can move relative to the fixed clamping member. However, the thread clamping driving unit has a contact member that can selectively contact or separate from the movable clamping member and a thread clamping driving source assembled on the contact member. The thread clamping driving source can generate a driving force to drive the contact member to a contact position, so that the contact member contacts one of the movable clamping members, and the movable clamping member is separated from the fixed clamping member by the driving force. In addition, the return spring is arranged between the movable cassette and the movable clamping member, and the return spring can generate a return force smaller than the driving force. During the process of the driving unit driving the contact member to move from the contact position to a separation position separated from the movable clamping member, the movable clamping member moves through the return force. The thread hooking mechanism has a thread hooking member that can swing, and the thread hooking member can swing parallel to the axis of the upper shaft to pass through the thread clamping mechanism.

[0012] Furthermore, a plurality of thread take-up units are installed on the movable cassette. And each thread take-up unit has a connecting rod assembly, a thread take-up lever, and a transmission member. The thread take-up lever is arranged between the connecting rod assembly and the transmission member. The thread take-up lever holder is fixed to the sewing body and has a fixed engagement portion fitted to the transmission member to restrict the transmission member from moving. The thread take-up driving lever is driven by the upper shaft to rotate and has a movable engagement portion fitted to the transmission member. The movable engagement portion is located on one side of the fixed engagement portion. Among them, when the movable cassette drives one of the needle bars to move from the control guide groove to the alignment space, the movable cassette can simultaneously drive the transmission member of one of the thread take-up units to move from the fixed engagement portion to the movable engagement portion.

[0013] The advantage of this creation is that the needle bar driving lever is arranged above the needle bar along the Z-axis direction. When the movable cassette drives all the needle bars to move, the needle bar driving lever and one of the needle bars can be axially arranged. Furthermore, when the needle bar driving lever drives the needle bar to reciprocate along the Z-axis through the rotating upper shaft, the needle bar driving lever can reduce the generation of a lateral component force perpendicular to the needle bar, thereby reducing the friction between the needle bar and the needle bar holder, and relatively increasing the service life of the needle bar. Brief Description of the Drawings

[0014] Figure 1 Stereogram of the switching needle bar sewing machine of the present invention;

[0015] Figure 2 Schematic diagram showing that the needle bar driving mechanism, thread take-up driving mechanism, switching mechanism, needle bar mechanism, thread take-up mechanism, thread clamping mechanism and thread hooking mechanism are all installed on the support base;

[0016] Figure 3 Assembly schematic diagram among the needle bar driving mechanism, thread take-up driving mechanism, switching mechanism, needle bar mechanism, thread take-up mechanism, thread clamping mechanism and thread hooking mechanism;

[0017] Figure 4 is Figure 3 exploded view of;

[0018] Figure 5 Schematic diagram showing the needle bar driving mechanism installed on the upper shaft;

[0019] Figure 6 Schematic diagram showing the thread take-up driving mechanism installed on the upper shaft;

[0020] Figure 7 Schematic diagram showing the switching mechanism installed on the sewing body;

[0021] Figure 8 Schematic diagram showing multiple needle bars passing through the movable cartridge;

[0022] Figure 9A Schematic diagram showing the needle bar engaged with the needle bar driving rod;

[0023] Figure 9B Schematic diagram showing the needle bar engaged with the needle bar holding seat;

[0024] Figure 10 Exploded view of the thread take-up unit;

[0025] Figure 11A Schematic diagram showing the thread take-up unit engaged with the thread take-up driving rod;

[0026] Figure 11B Schematic diagram showing the thread take-up unit engaged with the thread take-up rod holding seat;

[0027] Figure 12 Exploded view showing the thread clamping mechanism installed on the movable cartridge;

[0028] Figure 13 Schematic diagram showing the thread hooking mechanism installed on the sewing body;

[0029] Figure 14A Schematic diagram showing the sewing thread installed on the needle bar and the thread take-up rod;

[0030] Figure 14B Schematic diagram showing the upper shaft driving the needle bar to move;

[0031] Figure 14C Schematic diagram of the upper shaft driving the thread take-up lever to swing

[0032] Figure 14D Schematic diagram of the upper shaft driving the second needle bar to move to the highest point

[0033] Figure 14E Schematic diagram of the movable clamp moving relative to the fixed clamp

[0034] Figure 14F Schematic diagram of the thread hooking member passing through the surrounding space

[0035] Figure 14G Schematic diagram of the thread hooking member driving the sewing thread through the surrounding space

[0036] Figure 14H Schematic diagram of the movable clamp and the fixed clamp jointly clamping the sewing thread

[0037] Figure 14I Schematic diagram of the movable cassette driving the switching needle bar and the thread take-up lever to move leftward

[0038] Figure 14J Schematic diagram of the first needle bar engaging with the needle bar driving rod

[0039] Figure 14K Schematic diagram of the first thread take-up unit assembled on the thread take-up driving rod

[0040] Figure 14L Schematic diagram of the movable cassette driving the switching needle bar and the thread take-up lever to move rightward

[0041] Figure 14M Schematic diagram of the third needle bar engaging with the needle bar driving rod

[0042] Figure 14N Schematic diagram of the third thread take-up unit assembled on the thread take-up driving rod

[0043] Description of the reference numerals in the drawings: 1 - Switching needle bar sewing machine; 10 - Sewing body; 11 - Headstock; 12 - Pillar; 13 - Upper shaft; 14 - Crankshaft connecting rod; 15 - Support base; 151 - Main support arm; 152 - Left support arm; 153 - Right support arm; 154 - Moving space; 16 - Connecting rod; 161 - Guide shaft section; 162 - Left connecting section; 163 - Right connecting section; 20 - Needle bar driving mechanism; 21 - Needle bar driving rod; 211 - Engaging part; 211a - Engaging block; 211b - Engaging space; 211c - Engaging guide surface; 22 - Needle bar holding seat; 221 - Connecting frame; 222 - Guide block; 223 - Control guide groove; 223a - Left control guide groove; 223b - Right control guide groove; 223c - Left control guide surface; 223d - Right control guide surface; 224 - Alignment space; 30 - Thread take-up driving mechanism; 31 - Thread take-up driving rod; 311 - Movable engaging part; 311a - Movable engaging post; 311b - Movable engaging convex block; 311c - Movable guide surface; 32 - Thread take-up rod holding seat; 321 - Left thread take-up holding part; 321a - Left fixed engaging part; 321b - Left fixed engaging convex block; 321c - Left fixed guide surface; 322 - Right thread take-up holding part; 322a - Right fixed engaging part; 322b - Right fixed engaging convex block; 322c - Right fixed guide surface; 323 - Rotating space; 33 - Thread take-up transmission unit; 331 - Driving pulley; 332 - Driven pulley; 333 - Transmission belt; 40 - Switching mechanism; 41 - Movable box; 411 - Assembly hole; 412 - Needle bar hole; 413 - Thread take-up mounting bracket; 413a - Thread take-up mounting space; 42 - Switching driving unit; 421 - Switching driving source; 422 - Switching transmission shaft; 423 - Gear assembly; 424 - Conversion assembly; 424a - Internal thread; 424b - External thread; 50 - Needle bar mechanism; 51 - Needle bar; 51a - First needle bar; 51b - Second needle bar; 51c - Third needle bar; 511 - Sewing needle; 512 - Connecting part; 512a - Connecting arm; 512b - Connecting space; 512c - Connecting block; 60 - Thread take-up mechanism; 61 - Thread take-up unit; 61a - First thread take-up unit; 61b - Second thread take-up unit; 61c - Third thread take-up unit; 611 - Support bearing; 612 - Transmission part; 612a - Penetrating part; 612a1 - First penetrating space; 612a2 - Second penetrating space; 612b - Eccentric shaft; 613 - Thread take-up rod; 613a - Thread take-up hole; 614 - Link assembly; 614a - Swing arm pivot; 614b - Swing rod; 70 - Thread clamping mechanism; 71 - Thread clamping driving unit; 711 - Thread clamping driving source; 712 - Contact part; 712a - Connecting section; 712b - Contact section; 713 - Thread clamping telescopic rod; 72 - Thread clamping unit; 72a - First thread clamping unit; 72b - Second thread clamping unit; 72c - Third thread clamping unit; 721 - Fixed clamping part; 722 - Movable clamping part; 722a - Contact block; 722b - Ring frame; 722c - Surrounding space;723 - Return spring; 80 - Thread hooking mechanism; 81 - Thread hooking drive unit; 811 - Thread hooking drive source; 812 - Thread hooking movable rod; 813 - Thread hooking telescopic rod; 82 - Thread hooking unit; 821 - Swing frame; 821a - Left swing arm; 821b - Right swing arm; 821c - Main swing arm; 822 - Thread hooking member; F1 - Return force; F2 - Driving force; L - Sewing thread; L1 - First sewing thread; L2 - Second sewing thread; L3 - Third sewing thread; S - Longitudinal structure; T - Moving track; P1 - Separation position; P2 - Contact position; Detailed implementation manner

[0044] The present invention will be further described below in conjunction with specific embodiments and the accompanying drawings. The advantages and features of the present invention will become clearer as the description progresses.

[0045] In this schematic diagram, the two sides of the X-axis refer to the left and right sides of the switching needle bar sewing machine 1 of the present invention when the operator faces it, and the two sides of the Y-axis refer to the front and back sides of the switching needle bar sewing machine 1 of the present invention when the operator faces it. As for the Z-axis, it refers to the upper and lower sides of the switching needle bar sewing machine 1 of the present invention when the operator faces it. Furthermore, in the description of this case, directional terms such as "left", "right", "front", "back", "up", and "down" refer to the directions presented when the operator faces the switching needle bar sewing machine 1 of the present invention.

[0046] Please refer to Figures 1 to 4 As shown, the switching needle bar sewing machine 1 of the present invention has a sewing body 10, a needle bar drive mechanism 20, a thread take-up drive mechanism 30, a switching mechanism 40, a needle bar mechanism 50, a thread take-up mechanism 60, a thread clamping mechanism 70, and a thread hooking mechanism 80. The sewing body 10 has a head 11, a pillar 12, and a base (not shown in the figure). Inside the head 11, there is an upper shaft 13 parallel to the X-axis. And a thread cutting mechanism (not shown in the figure) is installed inside the above-mentioned base. Among them, the upper shaft 13 can rotate relative to the head 11. And one end of the upper shaft 13 is installed with a crankshaft connecting rod 14. In addition, outside the head 11, at the front side position of the head 11 in the Y-axis direction, there is a support seat 15. As shown in the figure, the support seat 15 has a main support arm 151 connected to the head 11. And on the left side position of the main support in the X-axis direction, there is a left support arm 152 arranged at intervals with a right support arm 153. And on the right side position of the main support arm 151 in the X-axis direction, there is a right support arm 153. So that a moving space 154 is formed among the main support arm 151, the left support arm 152, and the right support arm 153. As Figure 2As shown, both the left and right support arms 152 and 153 are commonly connected to a connecting rod 16 parallel to the upper shaft 13, such that a central partial section of the connecting rod 16 is located inside the moving space 154 to be set as a guiding shaft section 161, and opposite end portions of the connecting rod 16 respectively protrude outside the left and right support arms 152 and 153, such that an end portion of the connecting rod 16 near the left support arm 152 is set as a left connecting section 162 located outside the moving space 154, and an end portion of the connecting rod 16 near the right support arm 153 is set as a right connecting section 163 located outside the moving space 154. In this embodiment, the left connecting section 162 is located on the left side of the guiding shaft section 161, and the right connecting section 163 is located on the right side of the guiding shaft section 161, such that the guiding shaft section 161 is located between the left and right connecting sections 162 and 163.

[0047] Please refer to Figure 4 and Figure 5As shown, the needle bar driving mechanism 20 has a needle bar driving rod 21 and a needle bar holder 22. The needle bar driving rod 21 is parallel to the Z-axis, such that the needle bar driving rod 21 is perpendicular to the upper shaft 13 of the sewing body 10. The needle bar driving rod 21 is connected to the crankshaft connecting rod 14 of the sewing body 10, such that when the upper shaft 13 rotates, the needle bar driving rod 21 can be driven by the crankshaft connecting rod 14 to reciprocate up and down along the Z-axis direction. However, a engaging portion 211 is provided at the lower position of the needle bar driving rod 21 along the Z-axis direction. In this embodiment, the engaging portion 211 is provided with an engaging block 211a extending along the Z-axis direction, and an engaging space 211b is recessed on each of the front and rear sides of the engaging block 211a in the Y-axis direction. Among them, an engaging guiding surface 211c is provided on each of the left and right sides of the engaging block 211a inside the engaging space 211b. In addition, the needle bar holder 22 has a connecting frame 221 and a guiding block 222 extending from the connecting frame 221 along the Z-axis direction. The connecting frame 221 is fixed to the support base 15 of the sewing body 10, such that the needle bar holder 22 cannot move relative to the support base 15. The guiding block 222 is recessed on each of the front and rear sides in the Y-axis direction to form a regulating guide groove 223 parallel to the X-axis. Among them, the needle bar holder 22 penetrates from the connecting frame 221 toward the guiding block 222 to form an alignment space 224 parallel to the Z-axis, and the alignment space 224 communicates with the regulating guide groove 223, such that the regulating guide groove 223 is divided into a left regulating guide groove 223a and a right regulating guide groove 223b through the alignment space 224. Among them, a left regulating guiding surface 223c is provided on the inner side of the left regulating guide groove 223a close to the alignment space 224, and a right regulating guiding surface 223d is provided on the inner side of the right regulating guide groove 223b close to the left regulating guiding surface 223c. As shown in the figure, the transverse widths of both the needle bar driving rod 21 and the engaging portion 211 in the X-axis direction are smaller than the transverse width of the alignment space 224 in the X-axis direction, such that the engaging portion 211 can be located inside the alignment space 224, such that the engaging space 211b can be aligned with the regulating guide groove 223, and then the two engaging guiding surfaces 211c of the engaging block 211a face the left regulating guiding surface 223c and the right regulating guiding surface 223d respectively.

[0048] Please refer to Figure 4 and Figure 6As shown, the thread take-up driving mechanism 30 has a thread take-up driving rod 31 and a thread take-up rod holder 32. The thread take-up driving rod 31 is parallel to the upper shaft 13 of the sewing body 10. One end of the thread take-up driving rod 31 is connected to the upper shaft 13 via a thread take-up transmission unit 33. Moreover, a movable engaging portion 311 is provided at the end of the thread take-up driving rod 31 away from the thread take-up transmission unit 33. The thread take-up driving rod 31 passes through the right support arm 153 of the support base 15, such that the movable engaging portion 311 is located inside the moving space 154 of the support base 15. In this embodiment, the thread take-up transmission unit 33 has a driving pulley 331 assembled on the upper shaft 13 and a driven pulley 332 assembled on the thread take-up driving rod 31, and the driving pulley 331 is connected to the driven pulley 332 via a transmission belt 333. However, the movable engaging portion 311 is provided with a movable engaging post 311a and a plurality of movable engaging protrusions 311b extending from the periphery of the movable engaging post 311a. Each movable engaging protrusion 311b is provided with a movable guiding surface 311c on each of the left and right sides in the X-axis direction. In addition, the thread take-up rod holder 32 is fixed to the support base 15 of the sewing body 10. Moreover, the thread take-up rod holder 32 has two parts: a left thread take-up holder 321 in a hollow state and a right thread take-up holder 322 in a hollow state. The left thread take-up holder 321 is arranged at intervals along the X-axis direction with respect to the right thread take-up holder 322, such that a rotation space 323 is formed between the left and right thread take-up holders 321, 322. Among them, the left thread take-up holder 321 is fixed to the left support arm 152 of the support base 15, and the left thread take-up holder 321 is provided with a plurality of left fixed engaging protrusions 321b arranged in a ring to form a left fixed engaging portion 321a. Each left fixed engaging protrusion 321b is provided with a left fixed guiding surface 321c on the side close to the right thread take-up holder 322. The right thread take-up holder 322 is fixed to the right support arm 153 of the support base 15, and the right thread take-up holder 322 is provided with a right fixed engaging portion 322a. The right fixed engaging portion 322a is provided as a plurality of right fixed engaging protrusions 322b arranged in a ring. Each right fixed engaging protrusion 322b is provided with a right fixed guiding surface 322c on the side close to the left fixed guiding surface 321c. As shown in the figure, both the left and right thread take-up holders 321, 322 are coaxially arranged on the thread take-up driving rod 31, such that the axes of both the left and right thread take-up holders 321, 322 coincide with the axis of the thread take-up driving rod 31. The thread take-up driving rod 31 passes through the right thread take-up holder 322, such that the movable engaging portion 311 is located inside the rotation space 323. When the movable engaging portion 311 is located between the left and right thread take-up holders 321, 322, the left thread take-up holder 321 is located on the left side of the thread take-up driving rod 31 along the axis of the thread take-up driving rod 31, such that the movable engaging portion 311, the left fixed engaging portion 321a, and the right fixed engaging portion 322a together form a moving track T parallel to the upper shaft 13.At the same time, the two movable guiding surfaces 311c face the left and right fixed guiding surfaces 321c and 322c respectively.

[0049] Please refer to Figure 4 and Figure 7 As shown, the switching mechanism 40 has a movable cassette 41 and a switching drive unit 42. The movable cassette 41 is located inside the moving space 154 of the support base 15. Moreover, the movable cassette 41 is movably assembled to the guiding shaft section 161 of the connecting rod 16, so that the movable cassette 41 moves along the connecting rod 16 inside the moving space 154 of the support base 15. Furthermore, the movable cassette 41 can selectively approach the left support arm 152 of the support base 15 or the right support arm 153 of the support base 15. However, the movable cassette 41 is provided with an assembly hole 411, a plurality of needle bar holes 412 and a plurality of thread picking mounting brackets 413. The axis of the assembly hole 411 is parallel to the X-axis, the axis of each needle bar hole 412 is parallel to the Z-axis, and all the needle bar holes 412 are located below the needle bar holder 22 of the needle bar driving mechanism 20 in the Z-axis direction. Moreover, the plurality of needle bar holes 412 are arranged in an equidistant straight line along the X-axis. In addition, each thread picking mounting bracket 413 is arranged one-to-one in front of one of the needle bar holes 412, so that the plurality of thread picking mounting brackets 413 are also arranged in an equidistant straight line along the X-axis. And each thread picking mounting bracket 413 is provided with a thread picking mounting space 413a, and the thread picking mounting space 413a is used for the thread picking drive rod 31 of the thread picking driving mechanism 30 and the thread picking rod holder 32 of the thread picking driving mechanism 30 to pass through. However, the switching drive unit 42 is used to drive the movable cassette 41 to move inside the moving space 154. As shown in the figure, the switching drive unit 42 has a switching drive source 421 fixed to the sewing body 10 and a switching transmission shaft 422 passing through the right support arm 153. The switching drive source 421 can generate rotational power, and one end of the switching transmission shaft 422 is connected to the switching drive source 421 via a gear assembly 423. Moreover, the end of the switching transmission shaft 422 away from the switching drive source 421 penetrates into the interior of the assembly hole 411. Among them, the switching transmission shaft 422 is connected to the assembly hole 411 through a conversion assembly 424 that can convert rotational motion into linear motion. Thus, when the switching drive source 421 can generate rotational power, the switching drive source 421 can drive the switching transmission shaft 422 to rotate via the gear assembly 423, and the rotating switching transmission shaft 422 can drive the movable cassette 41 to perform linear movement through the conversion assembly 424. In this embodiment, the conversion assembly 424 is provided with an internal thread 424a formed inside the assembly hole 411 and an external thread 424b formed on the switching transmission shaft 422, and the internal thread 424a is helically engaged with the external thread 424b.

[0050] Please refer to Figure 4 and Figure 8As shown, the needle bar mechanism 50 has a plurality of needle bars 51 that can move along the Z-axis direction. Each needle bar 51 is inserted into one of the needle bar holes 412 of the movable cassette 41 in a one-to-one manner, such that the plurality of needle bars 51 are arranged in a straight line. Moreover, all the needle bars 51 are located below the needle bar holder 22 of the needle bar driving mechanism 20 in the Z-axis direction. Thus, the needle bar driving rod 21 of the needle bar driving mechanism 20 can be located above one of the needle bars 51 along the Z-axis direction, such that the above-mentioned needle bar driving rod 21 and one of the needle bars 51 are arranged along the Z-axis direction to form a longitudinal structure S that is substantially perpendicular to the upper shaft 13. Among them, a sewing needle 511 is provided at the lower end of each needle bar 51, and a connecting portion 512 is provided at the upper end of each needle bar 51. The transverse width of the connecting portion 512 in the X-axis direction is smaller than the transverse width of the alignment space 224 in the X-axis direction. Moreover, the connecting portion 512 of one of the needle bars 51 is engaged with the engaging portion 211 of the needle bar driving rod 21 to be located inside the alignment space 224 of the needle bar holder 22, such that the needle bar driving rod 21 can drive one of the needle bars 51 to reciprocate along the Z-axis direction, while the connecting portions 512 of the remaining needle bars 51 are respectively engaged with the left and right control guide grooves 223a, 223b of the needle bar holder 22, such that the remaining needle bars 51 cannot move along the Z-axis direction. Thus, the control guide grooves 223 of the needle bar holder 22 can be used to restrict the needle bars 51 from moving along the Z-axis direction, and the alignment space 224 can only allow a single needle bar 51 to move along the Z-axis direction. In this embodiment, the needle bar mechanism 50 has three needle bars 51. One of the needle bars 51 is engaged with the right control guide groove 223b through the connecting portion 512 to be set as a first needle bar 51a, another needle bar 51 is engaged with the engaging portion 211 through the connecting portion 512 to be set as a second needle bar 51b, and the last needle bar 51 is set as a third needle bar 51c to be engaged with the left control guide groove 223a through the connecting portion 512. Please refer to Figure 9A and Figure 9B , the connecting portion 512 has two connecting arms 512a and a connecting space 512b formed between the two connecting arms 512a. Each connecting arm 512a horizontally extends toward the inside of the connecting space 512b to form a connecting block 512c. Among them, when the connecting portion 512 is engaged with the engaging portion 211, the engaging block 211a of the engaging portion 211 is located inside the connecting space 512b. At the same time, each connecting block 512c is inserted into one of the engaging spaces 211b of the engaging portion 211 in a one-to-one manner. When the connecting portion 512 is engaged with the guiding block 222 of the needle bar holder 22, the guiding block 222 is located inside the connecting space 512b, and each connecting block 512c is inserted into one of the control guide grooves 223 of the needle bar holder 22 in a one-to-one manner.

[0051] Please refer to Figure 4 andFigure 10As shown, the thread take-up mechanism 60 has three thread take-up units 61. One of the thread take-up units 61 is set as a first thread take-up unit 61a and is installed on the right fixed engagement part 322a of the right thread take-up holder 322. Another thread take-up unit 61 is installed on the movable engagement part 311 of the thread take-up driving rod 31 and is set as a second thread take-up unit 61b. The last thread take-up unit 61 is set as a third thread take-up unit 61 and is installed on the left fixed engagement part 321a of the left thread take-up holder 321. However, the thread take-up mechanism 60 having three thread take-up units 61 is only for convenience of description. That is, the number of the thread take-up units 61 can be increased or decreased, and the thread take-up mechanism 60 can include multiple thread take-up units 61. Among them, each thread take-up unit 61 is mainly composed of a set of support bearings 611, a transmission member 612, a thread take-up rod 613, and a link assembly 614. The support bearings 611 are fixed to the thread take-up mounting frame 413 of the movable cartridge 41, so that the support bearings 611 are located inside the thread take-up mounting space 413a of the thread take-up mounting frame 413. Furthermore, the support bearings 611 cannot move relative to the thread take-up mounting frame 413. The appearance of the transmission member 612 is generally in a columnar state. And the transmission member 612 is movably assembled inside the inner diameter of the support bearings 611, so that the transmission member 612 can rotate relative to the support bearings 611. Among them, the transmission member 612 has a through hole part 612a located at the central position and an eccentric shaft 612b set as a cylinder. In this embodiment, the thread take-up driving rod 31 of the thread take-up driving mechanism 30 can pass through the transmission member 612, so that the transmission member 612 is coaxially arranged with the thread take-up driving rod 31, and the axis of the transmission member 612 overlaps with the axis of the thread take-up driving rod 31. The through hole part 612a has a first through hole space 612a1 and a plurality of second through hole spaces 612a2 surrounding the first through hole space 612a1. In addition, the eccentric shaft 612b is located on the outer peripheral side of the through hole part 612a. However, one end of the thread take-up rod 613 is provided with a thread take-up hole 613a. And the thread take-up rod 613 is pivotally connected to the eccentric shaft 612b at the end far from the thread take-up hole 613a, so that the thread take-up rod 613 can swing relative to the transmission member 612. Then the link assembly 614 has a swing arm support shaft 614a and a swing rod 614b that can swing. The swing arm support shaft 614a is fixed to the movable cartridge 41 of the switching mechanism 40, and both ends of the swing rod 614b are pivotally connected to the swing arm support shaft 614a and the thread take-up rod 613 respectively, so that the link assembly 614 can limit the swing path of the thread take-up rod 613. Among them, each thread take-up unit 61 is installed one-to-one on one of the thread take-up mounting frames 413 of the movable cartridge 41, so that the second thread take-up unit 61b can be connected to the thread take-up driving rod 31 of the thread take-up driving mechanism 30 through the through hole part 612a. Furthermore, the thread take-up driving rod 31 can drive the second thread take-up unit 61b to operate. And the first thread take-up unit 61a and the third thread take-up unit 61 can be connected to the left and right fixed engagement parts 321a, 322a of the thread take-up rod holder 32 through the through hole part 612a.The first thread picking unit 61a and the third thread picking unit 61 are rendered inoperable. Thus, the left and right fixed engaging portions 321a, 322a of the needle bar holder 22 are used to restrict the operation of the thread picking unit 61. Please refer to Figure 11A and Figure 11B As shown, when the threading portion 612a is penetrated by the movable engaging portion 311, the movable engaging post 311a of the movable engaging portion 311 is located inside the first threading space 612a1. At the same time, each movable engaging projection 311b of the movable engaging portion 311 is inserted one-to-one into one of the second threading spaces 612a2. When the threading portion 612a is penetrated by the left thread picking holder 321, a part of the left thread picking holder 321 is located inside the first threading space 612a1. At the same time, each left fixed engaging projection 321b of the left thread picking holder 321 is inserted one-to-one into one of the second threading spaces 612a2. Additionally, the right thread picking holder 322 has the same shape as the left thread picking holder 321. When the right thread picking holder 322 is inserted into the first threading space 612a1, each right fixed engaging projection 322b of the right thread picking holder 322 is simultaneously inserted one-to-one into one of the second threading spaces 612a2.

[0052] Please refer to Figure 4 and Figure 12As shown, the thread clamping mechanism 70 has a thread clamping drive unit 71 and three thread clamping units 72. The thread clamping drive unit 71 has a thread clamping drive source 711 and a contact member 712. The thread clamping drive source 711 is fixed to the support base 15 of the sewing body 10. Moreover, the thread clamping drive source 711 can generate moving power, such that the thread clamping drive source 711 can drive a thread clamping telescopic rod 713 movably assembled to the thread clamping drive source 711 to perform a linear movement. The contact member 712 is provided with a connection section 712a connected to the thread clamping telescopic rod 713 and a contact section 712b substantially perpendicular to the connection section 712a. Moreover, the contact member 712 is pivotally connected to the support base 15 at the junction between the connection section 712a and the contact section 712b, such that the contact member 712 can swing through the moving thread clamping telescopic rod 713. Among them, the three thread clamping units 72 are all connected to the movable cartridge 41 of the switching mechanism 40, such that the three thread clamping units 72 are respectively aligned in pairs with one of the needle bars 51 of the needle bar mechanism 50. Furthermore, one of the thread clamping units 72 is set as a first thread clamping unit 72a to be aligned with the first needle bar 51a, and another thread clamping unit 72 is aligned with the second needle bar 51b to be set as a second thread clamping unit 72b, and the last one is aligned with the third needle bar 51c to be set as a third thread clamping unit 72c. However, the thread clamping mechanism 70 having three thread clamping units 72 is only for convenience of description. That is, the number of the thread clamping units 72 can be increased or decreased, such that the number of the thread clamping units 72 can be the same as the number of the needle bars 51 and the number of the thread picking units 61. As shown in the figure, each thread clamping unit 72 has a fixed clamping member 721 fixed to the movable cartridge 41, a movable clamping member 722 movably connected to the fixed clamping member 721, and a return spring 723 located between the movable cartridge 41 and the movable clamping member 722. The movable clamping member 722 can move relative to the fixed clamping member 721. One end of the movable clamping member 722 extends to form a contact block 722a that can selectively contact or separate from the contact section 712b. Moreover, a ring frame 722b is provided at one end of the movable clamping member 722 away from the contact block 722a. Among them, the ring frame 722b surrounds to form a surrounding space 722c. In addition, both ends of the return spring 723 are respectively assembled to the movable cartridge 41 and the movable clamping member 722, such that the return spring 723 can form a return acting force F1 acting on the movable clamping member 722, and the movable clamping member 722 can block the surrounding space 722c by the fixed clamping member 721 through the return acting force F1.

[0053] Please refer to Figure 4 and Figure 13As shown, the thread hooking mechanism 80 has a thread hooking drive unit 81 and a thread hooking unit 82. The thread hooking drive unit 81 has a fixed thread hooking drive source 811 and a freely movable thread hooking movable rod 812. The thread hooking drive source 811 can be fixed to the support base 15 of the sewing body 10, and the thread hooking drive source 811 can generate a moving force, so that the thread hooking drive source 811 can drive a thread hooking telescopic rod 813 movably assembled to the thread hooking drive source 811 to perform a linear movement. The two ends of the thread hooking movable rod 812 are respectively pivotally connected to the thread hooking telescopic rod 813 and the thread hooking unit 82. Among them, the thread hooking unit 82 has a swing frame 821 and a thread hooking member 822. The swing frame 821 has a left swing arm 821a pivotally connected to the thread hooking movable rod 812 and a right swing arm 821b arranged at intervals with the left swing arm 821a. A main swing arm 821c connected to the thread hooking member 822 is provided between the left and right swing arms 821a and 821b, so that the appearance of the swing frame 821 presents a U shape. In this embodiment, the left swing arm 821a is pivotally connected to the left connection section 162 of the connecting rod 16, and the right swing arm 821b is pivotally connected to the right connection section 163 of the connecting rod 16, so that the swing frame 821 is pivotally connected to the connecting rod 16, and the swing frame 821 can drive the thread hooking member 822 to swing relative to the support base 15.

[0054] Please refer to Figure 14A As shown, when the sewing machine 1 with the needle bar 51 actually operates, three different colored sewing threads L are prepared. One of the sewing threads L is set as a first sewing thread L1 to pass through the sewing needle 511 of the first needle bar 51a and the thread take-up hole 613a of the first thread take-up unit 61a, and another sewing thread L is set as a second sewing thread L2 to pass through the sewing needle 511 of the second needle bar 51b and the thread take-up hole 613a of the second thread take-up unit 61b. The last sewing thread L is set as a third sewing thread L3 to pass through the sewing needle 511 of the third needle bar 51c and the thread take-up hole 613a of the third thread take-up unit 61. Please refer to Figure 14B As shown, the upper shaft 13 of the sewing body 10 rotates, so that the crankshaft connecting rod 14 of the sewing body 10 drives the needle bar drive rod 21 of the needle bar drive mechanism 20 to move along the Z-axis direction inside the alignment space 224 of the holding seat 22. As shown in the figure, at this time, since the engaging portion 211 of the needle bar drive rod 21 engages with the connecting portion 512 of the second needle bar 51b, the needle bar drive rod 21 moving along the Z-axis direction can drive the second needle bar 51b to perform a reciprocating linear movement along the Z-axis direction.

[0055] Please refer to Figure 14CAs shown, when the upper shaft 13 of the sewing body 10 rotates, the driving pulley 331 of the thread take-up transmission unit 33 will rotate synchronously, causing the driving pulley 331 of the thread take-up transmission unit 33 to drive the driven pulley 332 of the thread take-up transmission unit 33 through the transmission belt 333 of the thread take-up transmission unit 33. Then, the thread take-up drive rod 31 of the thread take-up drive mechanism 30 can rotate relative to the thread take-up rod holding seat 32 of the thread take-up drive mechanism 30. At this time, since the movable engaging portion 311 of the thread take-up drive rod 31 is engaged with the transmission member 612 of the second thread take-up unit 61b, the transmission member 612 of the second thread take-up unit 61b can rotate relative to the support bearing 611 of the second thread take-up unit 61b. Furthermore, the eccentric shaft 612b of the transmission member 612 rotates around the axis of the thread take-up drive rod 31, causing the thread take-up rod 613 of the second thread take-up unit 61b to reciprocate through the link assembly 614 of the second thread take-up unit 61b, as Figure 14B shown, the connecting portions 512 of the first and third needle bars 51a and 51c are respectively engaged with the left and right control guide grooves 223a and 223b of the needle bar holding seat 22, preventing the remaining needle bars 51 from moving along the Z-axis direction. Additionally, as Figure 14A shown, the transmission members 612 of the first and third thread take-up units 61a and 61c are respectively engaged with the left fixed engaging portion 321a of the left thread take-up holding member 321 and the right fixed engaging portion 322a of the right thread take-up holding member 322, preventing the transmission members 612 of the first and third thread take-up units 61a and 61c from rotating. Accordingly, the thread take-up rods 613 of the first and third thread take-up units 61a and 61c will not swing.

[0056] Please refer to Figure 14D shown. After the second needle bar 51b of the needle bar mechanism 50 completes the sewing operation, the upper shaft 13 of the sewing body 10 continues to rotate to drive the second needle bar 51b to move to the highest point, aligning the engaging space 211b of the engaging portion 211 with the control guide groove 223 of the needle bar holding seat 22. Next, the above-mentioned thread cutting mechanism (not shown in the figure) cuts the second sewing thread L2. Please refer to Figure 14EAs shown, the clamping drive source 711 of the clamping drive unit 71 generates a driving force F2 greater than the restoring force F1, so that the clamping drive source 711 drives the contact member 712 of the clamping drive unit 71 to swing, so that the contact segment 712b of the contact member 712 moves from a separation position P1 to a contact position P2. When the contact segment 712b is at the contact position P2, the contact segment 712b contacts the contact block 722a of the second clamping unit 72b, so that the movable clamp 722 of the second clamping unit 72b is driven by the driving force F2. The fixed clamp 721 of the second clamping unit 72b moves downward, so that the surrounding space 722c of the movable clamp 722 can expose the fixed clamp 721. As shown in the figure, when the contact section 712b is located at the contact position P2, since the contact section 712b only contacts the contact block 722a of the second clamping unit 72b, the relative contact section 712b will not contact the contact blocks 722a of the first and third clamping units 72a and 72c, so that the movable clamps 722 of the first and third clamping units 72a and 72c will remain stationary.

[0057] See also Figure 14F and Figure 14G As shown, when the movable clamp 722 of the second clamping unit 72b is staggered from the fixed clamp 721 of the second clamping unit 72b to expose the surrounding space 722c of the movable clamp 722, the wire hooking driving source 811 of the wire hooking driving unit 81 drives the wire hooking telescopic rod 813 of the wire hooking driving unit 81 to extend outward, so that the wire hooking telescopic rod 813 drives the swing frame 821 of the wire hooking unit 82 to support the connecting rod 1 of the seat 15 through the wire hooking movable rod 812 of the wire hooking driving unit 81. 6 is the axis to swing counterclockwise, so that the thread hooking member 822 of the thread hooking unit 82 can pass through the surrounding space 722c of the second thread clamping unit 72b, and then the thread hooking member 822 can hook the second suture L2, and then the thread hooking driving source 811 drives the thread hooking telescopic rod 813 to shorten inward, so that the swing frame 821 swings clockwise, so that the thread hooking member 822 of the thread hooking unit 82 can drive the second suture L2 to pass through the surrounding space 722c of the second thread clamping unit 72b.

[0058] See also Figure 14HAs shown, after the second sewing thread L2 passes through the surrounding space 722c of the second thread clamping unit 72b, the thread clamping drive source 711 of the thread clamping drive unit 71 drives the contact member 712 of the thread clamping drive unit 71 to swing, so that the contact section 712b of the contact member 712 moves back from the contact position P2 to the separation position P1, causing the contact section 712b to move away from the contact block 722a of the second thread clamping unit 72b, and preventing the contact section 712b from contacting the contact block 722a of the second thread clamping unit 72b. Then, the return spring 723 of the second thread clamping unit 72b pulls the movable clamping member 722 of the second thread clamping unit 72b to move upward along the Z axis through the return force F1. Furthermore, the fixed clamping member 721 of the second thread clamping unit 72b blocks the surrounding space 722c of the second thread clamping unit 72b, causing the fixed clamping member 721 and the movable clamping member 722 of the second thread clamping unit 72b to jointly clamp the second sewing thread L2.

[0059] Please refer to Figure 14I , Figure 14J and Figure 14KAs shown, when the sewing operation is performed using the first needle bar 51a of the needle bar mechanism 50, the switching drive source 421 of the switching drive unit 42 can generate rotational power, so that the switching drive source 421 can drive the switching drive shaft 422 of the switching drive unit 42 to rotate via the gear assembly 423 of the switching drive unit 42. The rotating switching drive shaft 422 can drive the movable box 41 to move linearly to the left through the conversion assembly 424, so that the movable box 41 drives all the needle bars 51, all the thread take-up units 61 and all the thread clamping units 72 to move to the left at the same time, until the first needle bar 51a is aligned with the needle bar drive rod 21 of the needle bar drive mechanism 20. During the process that the connecting portion 512 of the first needle bar 51a moves from the right control guide groove 223b of the needle bar holder 22 to the engaging portion 211 of the needle bar drive rod 21, the two connecting arms 512a of the first needle bar 51a will contact the engaging guide surface 211c of the engaging portion 211, so that the connecting block 512c of the first needle bar 51a penetrates into the interior of the engaging space 211b through the engaging guide surface 211c, so that the connecting portion 512 of the first needle bar 51a is engaged with the engaging portion 211 of the needle bar drive rod 21. At the same time, the two connecting arms 512a of the second needle bar 51b will contact the left control guide surface 223c of the needle bar holder 22, so that the connecting block 512c of the second needle bar 51ba penetrates into the interior of the left control guide groove 223a of the needle bar holder 22 through the left control guide surface 223c, so that the connecting portion 512 of the second needle bar 51b can move from the engaging portion 211 of the needle bar drive rod 21 to the interior of the left control guide groove 223a of the needle bar holder 22, so that the left control guide groove 223a is engaged with the connecting portions 512c of the second and third needle bars 51b and 51c at the same time. In addition, the transmission member 612 of the second thread take-up unit 61b also moves from the movable engaging portion 311 of the thread take-up drive rod 31 to the left fixed engaging portion 321a of the left thread take-up holder 321, so that the transmission member 612 of the second thread take-up unit 61b touches the left fixed guide surface 321c of the left fixed engaging convex block 321b, so that each left fixed engaging convex block 321b can be inserted into the second through space 612a2 of the second thread take-up unit 61b one by one. Furthermore, the left fixed engaging portion 321a is engaged with the transmission members 612 of the second and third thread take-up units 61b and 61c at the same time. At the same time, the transmission member 612 of the first thread take-up unit 61a moves from the right fixed engaging portion 322a of the right thread take-up holder 322 to the movable engaging portion 311 of the thread take-up drive rod 31, so that the transmission member 612 of the first thread take-up unit 61a touches the movable guide surface 311c of the movable engaging convex block 311b, so that the transmission member 612 of the first thread take-up unit 61a can be sleeved on the movable engaging portion 311. Furthermore, each movable engaging convex block 311b penetrates into the second through space 612a2 of the first thread take-up unit 61a one by one. Thus, when the upper shaft 13 of the sewing body 10 rotates, the first needle bar 51a can move along the Z axis.The thread take-up lever 613 of the first thread take-up unit 61a can swing.

[0060] However, the description of the engagement of the first sewing needle 511 of the needle bar mechanism 50 with the engagement portion 211 of the needle bar drive rod 21 by the switching mechanism 40 and the engagement of the first thread take-up unit 61a of the thread take-up mechanism 60 with the movable engagement portion 311 of the thread take-up drive rod 31 is for illustrative purposes only. That is, as Figure 14L 、 Figure 14M 、 Figure 14N shown, the switching drive source 421 of the switching drive unit 42 drives the transmission shaft of the switching drive unit 42 to rotate in the reverse direction via the gear assembly 423 of the switching drive unit 42. The switching transmission shaft 422 can drive the movable cassette 41 to move linearly to the right through the conversion assembly 424, so that the movable cassette 41 moves to the right until the third needle bar 51c is aligned with the needle bar drive rod 21 of the needle bar drive mechanism 20, causing the right control guide groove 223b of the needle bar holder 22 to engage with the first and second needle bars 51a and 51b of the needle bar mechanism 50. At the same time, the connecting portion 512 of the third needle bar 51c is engaged with the engagement portion 211 of the needle bar drive rod 21. In addition, the transmission member 612 of the second thread take-up unit 61b also moves out of the movable engagement portion 311 of the thread take-up drive rod 31 to the right fixed engagement portion 322a of the right thread take-up holder 322, so that the right fixed engagement portion 322a simultaneously engages the transmission members 612 of the first and second thread take-up units 61a and 61b. At the same time, all the thread take-up units 61 move along the moving track T, and the transmission member 612 of the third thread take-up unit 61c moves from the left fixed engagement portion 321a of the left thread take-up holder 321 to the movable engagement portion 311 of the thread take-up drive rod 31. Thus, when the upper shaft 13 of the sewing body 10 rotates, the third needle bar 51c can move along the Z axis, and the thread take-up lever 613 of the third thread take-up unit 61 can swing.

[0061] The above description is illustrative rather than restrictive of the present invention. Those of ordinary skill in the art understand that many modifications, variations, or equivalents can be made without departing from the spirit and scope defined by the claims, and all of them will fall within the protection scope of the present invention.

Claims

1. A switching needle bar sewing machine, comprising: A sewing body having an upper shaft parallel to the X-axis, and the upper shaft is rotatable; A movable cassette movably connected to the sewing body such that the movable cassette can move; A needle bar holder fixed to the sewing body and having a control guide groove and an alignment space communicating with the control guide groove, A single-needle bar drive rod, aligned with the alignment space and capable of moving along the Z-axis direction through the upper shaft; And A plurality of needle bars mounted on the movable cassette, and the plurality of needle bars can be respectively engaged with the control guide groove and the needle bar drive rod; Wherein, The movable cassette can drive all the needle bars to move, so that one of the needle bars moves to the alignment space to be engaged with the needle bar drive rod, enabling the needle bar aligned with the alignment space to move along the Z-axis direction through the needle bar drive rod, while the remaining needle bars are engaged with the control guide groove and cannot move along the Z-axis direction; It is characterized in that: The needle bar drive rod is arranged at a position above the needle bar in the alignment space along the Z-axis direction, so that the needle bar drive rod and the needle bar in the alignment space are arranged along the Z-axis direction to form a longitudinal structure substantially perpendicular to the upper shaft; It further has a thread clamping mechanism, and the thread clamping mechanism includes: A plurality of thread clamping units, each thread clamping unit having a fixed clamping member and a movable clamping member, the fixed clamping member is connected to the movable cassette such that the movable cassette can drive the plurality of thread clamping units to move, and the movable clamping member is movably connected to the fixed clamping member so that the movable clamping member can move relative to the fixed clamping member; And A thread clamping drive unit having a contact member that can selectively contact or separate from the movable clamping member and a thread clamping drive source assembled on the contact member, the thread clamping drive source can generate a driving force to drive the contact member to a contact position, enabling the contact member to contact one of the movable clamping members, so that the movable clamping member separates from the fixed clamping member through the driving force.

2. The switching needle bar sewing machine according to claim 1, wherein: The needle bar has a connecting portion engaged with the control guide groove, the needle bar drive rod has an engaging portion that can be engaged with the connecting portion, and both the connecting portion and the engaging portion are located at a position above the needle bar along the Z-axis direction.

3. The switching needle bar sewing machine according to claim 2, characterized in that: The engaging portion has an engaging space aligned with the control guide groove, and a engaging guide surface close to the control guide groove is provided inside the engaging space, and the engaging guide surface is used to guide the connecting portion into the inside of the engaging space.

4. The switching needle bar sewing machine according to claim 3, wherein: A control guide surface close to the engaging guide surface is provided inside the control guide groove, and the control guide surface is used to guide the connecting portion into the inside of the control guide groove.

5. The switching needle bar sewing machine according to claim 2, characterized in that: The lateral widths of both the connecting portion and the engaging portion are smaller than the lateral width of the alignment space, so that both the connecting portion and the engaging portion can be located inside the alignment space.

6. The switching needle bar sewing machine according to claim 1, characterized in that: The wire clamping mechanism further has a return spring disposed between the movable cassette and the movable clamping member. The return spring can generate a return force smaller than the driving force. During the process that the wire clamping driving unit drives the contact member to move from the contact position to a separation position separated from the movable clamping member, the movable clamping member moves by means of the return force.

7. The switching needle bar sewing machine according to claim 1, wherein: The switching needle bar sewing machine further has a thread hooking mechanism connected to the sewing body. The thread hooking mechanism has a thread hooking member capable of swinging. The thread hooking member can swing parallel to the axis of the upper shaft and pass through the wire clamping mechanism.

8. The switching needle bar sewing machine according to claim 1, wherein: The switching needle bar sewing machine further includes: A plurality of thread take-up units are installed on the movable cassette and have a link assembly, a thread take-up lever, and a transmission member. The thread take-up lever is disposed between the link assembly and the transmission member; A thread take-up lever holder is fixed to the sewing body and has a fixed engagement portion fitted to the transmission member to restrict the transmission member from moving; A thread take-up driving lever is driven by the upper shaft to rotate and has a movable engagement portion fitted to the transmission member. The movable engagement portion is located on one side of the fixed engagement portion; Wherein, when the movable cassette drives one of the needle bars to move from the control guide groove to the alignment space, the movable cassette can simultaneously drive the transmission member of one of the thread take-up units to move from the fixed engagement portion to the movable engagement portion.

9. The switching needle bar sewing machine according to claim 1, characterized in that: The lateral width of the alignment space is greater than the lateral width of the needle bar driving rod, and the needle bar driving rod is located inside the alignment space, so that the needle bar driving rod can move inside the alignment space.

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