Large space high speed disk sewing machine without umbrella teeth

Abstract

This invention discloses a high-speed, large-space sewing machine without umbrella-tooth joints, comprising: a worktable, a support frame, a main shaft, a main shaft drive device, a needle plate, a first drive device, a hook assembly, a second drive device, a thread take-up device, and a third drive device. The second drive device includes a connecting rod assembly and a needle swing lever. The third drive device includes a second cam sleeved on a short shaft, a first thread take-up lever located on one side of the second cam and driven by the second cam to swing the thread take-up device, a second thread take-up lever located on the other side of the second cam, and a push rod driven by the second thread take-up lever to push the thread take-up device to move laterally. This invention increases the space between the main shaft and the short shaft, effectively improving ease of use. Furthermore, this invention improves transmission efficiency by balancing the pressure between the first and second thread take-up levers and the second cam in the third drive device, making the machine rotate more easily and smoothly.

Description

Technical Field

[0001] This invention relates to the field of sewing machine technology, and specifically to a high-speed sewing machine with large space and no umbrella teeth. Background Technology

[0002] The sewing machine, also known as a sew-on-knitting machine, is one of the important pieces of equipment in the wool knitting industry. It is used to sew together knitted garment pieces, collars, cuffs, etc. To simplify the structure of the sewing machine and improve its working efficiency, much effort has been made and significant progress has been made. However, with the continuous emergence of new synthetic fiber fabrics and the ever-changing demands of consumers, sweater styles are becoming increasingly diverse, placing higher and higher demands on the performance of sewing machines. The existing structures of various sewing machines on the market have gradually revealed their drawbacks, such as insufficient feed space, easy wear of the serrations, and excessive noise.

[0003] The general structure of a typical sewing machine can be divided into three parts: the sewing platform assembly, the support assembly, and the needle plate assembly. The support is usually fixed with a single leg, resulting in poor sturdiness and stability. The transmission of a typical sewing machine uses a combination of multi-axis and connecting rods, and the sewing speed is generally controlled at around 400-500 rpm. Increasing the speed will seriously affect the service life.

[0004] The high-speed sewing machine on the market is designed to sew at 800-1000 rpm, which is twice that of the ordinary sewing machine. The structure is also very different. The high-speed single-axis sewing machine integrates the machine bed, support, and needle plate into a whole. Its indexing and take-up mechanism uses bevel gear transmission. The high-speed sewing machine has a fast sewing speed and uses a single main shaft transmission. The space for passing the piece is relatively small. The moving parts and load of the machine are almost concentrated on the main shaft. In particular, the pressure generated by the top rod and the cam and the take-up lever and the cam creates an unbalanced force on the bearings mounted on the support. The bevel gear and bearings are prone to wear, which affects the machine's accuracy and service life.

[0005] Furthermore, sewing machines typically use a cam to perform the thread take-up action. When the machine speed reaches 500 rpm or higher, the pressure on the cam from the parts that work with it increases. This can cause the main shaft to reverse when the machine stops, leading to skipped stitches, loose yarn, and needle collisions. To prevent this, most manufacturers currently use a one-way bearing on the main shaft, with an external ratchet, a hook tip to hold the ratchet tooth, and a tension spring to hold the hook laterally. However, this device has been found to put pressure on the shaft and the one-way bearing during use, increasing the machine load and causing the one-way bearing to wear out easily, thus affecting its lifespan.

[0006] In view of the above, the inventors propose the following technical solution. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-speed sewing machine with large space and no umbrella teeth.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a high-speed sewing machine with large space and no umbrella teeth, comprising: a machine platform, a bracket installed on the side of the machine platform, a main shaft passing through the machine platform and the bracket, a main shaft drive device installed on the outside of the machine platform for driving the main shaft to rotate, a needle plate installed at the lower end of the machine platform, a first drive device installed in the machine platform and linked to the main shaft for driving the needle plate to rotate, a hook needle assembly installed on the outside of the bracket and cooperating with the needle plate, a second drive device installed in the bracket for driving the hook needle assembly to swing back and forth and left and right, a thread take-up device installed on the outside of the bracket, and a third drive device installed in the bracket for driving the thread take-up device to work. The bracket is provided with an auxiliary shaft structure, and the main shaft and the auxiliary shaft structure are connected... It also includes a transmission structure; the auxiliary shaft structure includes a bearing seat mounted on the bracket, a first cam mounted on the bearing seat for driving the hook assembly to swing, and a short shaft passing through the bearing seat; the second driving device includes a connecting rod assembly that can be driven between the first cam and the hook assembly, and a needle swing lever mounted on the outer end of the bearing seat and driven by the first cam to push the hook assembly to move laterally; the third driving device includes a second cam sleeved on the short shaft, a first thread take-up lever mounted on one side of the second cam and driven by the second cam to drive the thread take-up device to swing, a second thread take-up lever mounted on the other side of the second cam, and a top rod mounted on the bracket and driven by the second thread take-up lever to push the thread take-up device to move laterally.

[0009] Furthermore, in the above technical solution, the linkage assembly includes a universal joint connected to the cam and driven by the cam to reciprocate, a first offset shaft that limits the universal joint to the cam, a washer disposed between the universal joint and the cam, a swing block connected to the universal joint and driven by the universal joint to swing, and a connector passing through the connection between the universal joint and the swing block; the swing block includes a swing end and a fixed end, wherein the fixed end is tightly clamped to the needle arm shaft and used to drive the needle arm shaft to rotate, and a protrusion is also formed on the fixed end; the needle swing lever includes a needle swing rod body, a third contact bearing disposed at the upper end of the needle swing rod body and forming rolling contact with the outer edge of the first cam, a first crossbar connected to the lower end of the needle swing rod body, and a pusher disposed at the end of the first crossbar and pushed against the fixed end, wherein the middle part of the needle swing rod body is limited to the bearing seat by a first bolt, so that the upper and lower ends of the needle swing rod body can swing with the first bolt as the fulcrum.

[0010] Furthermore, in the above technical solution, the first line-taking lever includes a first rod body, a first contact bearing disposed at the upper end of the first rod body and forming rolling contact with the second cam, and a first fulcrum shaft for positioning the first rod body on the bracket. The first rod body also extends to form a first arm, which is provided with a pressure head for abutting against the upper end of the piston rod. The first rod body is in the shape of an "r" or a reverse "r". The second line-taking lever includes a second rod body, a second contact bearing disposed at the upper end of the second rod body and forming rolling contact with the second cam, and a second fulcrum shaft for positioning the second rod body on the bracket. The second rod body extends downward to form a second arm, which is formed with an abutting portion for abutting against the top rod.

[0011] Furthermore, the above technical solution also includes: a housing oil storage assembly, which is enclosed and covered outside the bracket. The housing oil storage assembly includes a lower cover and an upper cover on the lower cover. An oil storage tank for containing lubricating oil is formed inside the lower cover. The main shaft passes through the oil storage tank. The oil storage tank is also provided with an oil agitator. The oil agitator is fixed to the main shaft by self-tapping screws and rotated by the main shaft to splash the lubricating oil in the oil storage tank upwards. The oil agitator includes a positioning cylinder sleeved on the main shaft and at least one oil agitator blade integrally formed with the positioning cylinder and extending into the oil storage tank to agitate the lubricating oil.

[0012] Furthermore, in the above technical solution, the transmission structure includes a first synchronous gear sleeved on the end of the main shaft, a second synchronous gear sleeved on the short shaft, a first support seat mounted on the bracket and used to support the short shaft, a third tensioning wheel disposed on the first support seat, a first synchronous belt that is tractably connected between the first synchronous gear and the second synchronous gear and passes around the third tensioning wheel, and a support rod inserted into the bracket and used to support the first support seat.

[0013] Furthermore, in the above technical solution, the thread-taking device includes: a fixed sleeve installed on the outside of the bracket, a thread-taking slide sleeve disposed in the fixed sleeve, an abutment block fixedly connected to the thread-taking slide sleeve and abutting one end of the top rod, a striking plate positioning seat fixedly connected to the thread-taking slide sleeve, a striking plate installed in the striking plate positioning seat, and a piston rod movably embedded in and passing through the thread-taking slide sleeve, wherein the lower end of the piston rod is also provided with a roller for abutting against the striking plate, and the upper end of the piston rod abuts against the first thread-taking lever.

[0014] Furthermore, in the above technical solution, the middle part of the striking piece is pivotally connected to the striking piece positioning seat, and both the front and rear ends of the striking piece extend beyond the front and rear ends of the striking piece positioning seat. The rear end of the striking piece is connected to the rear end of the striking piece positioning seat through a first reset structure and is used to drive the striking piece to reset. The first reset structure is a double spring, and a wire-picking triangle is also installed at the front end of the striking piece.

[0015] Furthermore, in the above technical solution, the punching positioning seat is provided with an installation groove, the middle part of the punching sheet is installed in the installation groove, and the punching positioning seat is provided with a first hole through the installation groove, and a first bearing is accommodated in the first hole. A bearing screw passes through the first bearing, the installation groove and the punching fulcrum hole in the punching sheet and is fixed with a nut, so that the bearing screw fixes the inner diameter of the punching sheet and the first bearing; the top end of the fixing sleeve and the take-up sleeve are stably connected by a plane bearing.

[0016] Furthermore, in the above technical solution, the hook assembly includes a needle arm shaft disposed on the bracket, a needle arm mounted on the needle arm shaft, a spring sleeved on the needle arm shaft and pressing against the bracket and the connecting rod assembly, and a large needle mounted on the end of the needle arm.

[0017] Furthermore, in the above technical solution, the main shaft is assembled with the carriage through a first bushing and several first bearings. The main shaft drive device includes a drive motor mounted on the carriage, a third synchronous gear connected to the main shaft, and a third synchronous belt that passes around the third synchronous gear and the output end of the drive motor in a transmissive manner. The first drive device includes a worm gear sleeved on the main shaft, a central gear shaft that is perpendicular to the main shaft and passes through the carriage and connected to the needle plate, and a worm wheel sleeved on the central gear shaft and meshing with the worm gear.

[0018] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0019] In this invention, an adjustable transmission structure replaces the traditional bevel gear, effectively reducing noise and simplifying maintenance costs. It also increases the space between the main shaft and the short shaft, significantly improving ease of use and making it suitable for application in various sewing machine structures. Furthermore, compared to existing structures, this invention improves transmission efficiency by balancing the pressure of the first and second thread take-up levers of the third drive device on the second cam, resulting in smoother and easier rotation of the equipment. Additionally, this invention includes an oiling component to lubricate the most easily worn connecting rod assembly, enabling oil recycling and extending the lifespan of the invention. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0021] Figure 2 This is an exploded structural diagram of the present invention.

[0022] Figure 3 This is a schematic diagram of the internal structure of the present invention.

[0023] Figure 4 This is a schematic diagram of the structure of the hook assembly, the second driving device, and the bracket in this invention.

[0024] Figure 5 This is an exploded structural diagram of the thread-picking device in this invention.

[0025] Figure 6 This is a schematic diagram of the needle pendulum lever in this invention.

[0026] Figure 7 This is an exploded structural diagram of the connecting rod assembly in this invention.

[0027] Figure 8 This is a schematic diagram of the structure of the first line-picking lever in this invention.

[0028] Figure 9 This is a schematic diagram of the structure of the second line-picking lever in this invention.

[0029] Figure 10 This is an exploded structural diagram of the transmission structure in this invention.

[0030] Figure 11 This is an exploded structural diagram of the lower cover in this invention.

[0031] Figure 12 This is an exploded structural diagram of the upper cover in this invention.

[0032] Figure 13 This is an exploded structural diagram of the oiling component in this invention. Detailed Implementation

[0033] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0034] See Figures 1 to 13The image shows a high-speed, large-space sewing machine without umbrella teeth, comprising: a sewing machine platform 200; a support 100 mounted on the side of the sewing machine platform 200; a main shaft 1 passing through the sewing machine platform 200 and the support 100; a main shaft drive device 300 mounted on the outside of the sewing machine platform 200 for driving the main shaft 1 to rotate; a needle plate 2 mounted at the lower end of the sewing machine platform 200; a first drive device 400 mounted in the sewing machine platform 200 and linked to the main shaft 1 for driving the needle plate 2 to rotate; a hook needle assembly 30 mounted on the outside of the support 100 and cooperating with the needle plate 2; a second drive device 500 mounted in the support 100 for driving the hook needle assembly 30 to swing back, forth, left, and right; a thread take-up device 6 mounted on the outside of the support 100; and a thread take-up device 6 mounted in the support 100 for... A third driving device 600 drives the thread take-up device 6; the bracket 100 is provided with an auxiliary shaft structure 4, and a transmission structure 50 is also provided between the main shaft 1 and the auxiliary shaft structure 4; the auxiliary shaft structure 4 includes a bearing seat 41 disposed on the bracket 100, a first cam 42 disposed on the bearing seat 41 and used to drive the hook needle assembly 30 to swing, and a short shaft 43 passing through the bearing seat 41; here, in this invention, the transmission structure 50 replaces the traditional bevel gear transmission between the main shaft 1 and the short shaft 43. Preferably, the transmission structure 50 is an adjustable synchronous belt structure, which can significantly reduce noise, and the later maintenance is simple and low-cost, and the sewing speed of the sewing machine can be stably reached 1200 rpm. At the same time, it makes the main shaft 1 and the short shaft 43 more compact, so as to form a larger sewing feed space, improve the ease of use, and make this invention highly competitive in the market. Among them, the feed space is the space between the needle plate 2 and the lower cover 101 for sewing products.

[0035] The second driving device 500 includes a connecting rod assembly 3 that is transmissively disposed between the first cam 42 and the hook assembly 30, and a needle swing lever 5 disposed at the outer end of the bearing seat 41 and driven by the first cam 42 to push the hook assembly 30 to move laterally. Here, the first cam 42 can drive the connecting rod assembly 3 and the needle swing lever 5 to work simultaneously, which greatly improves the transmission efficiency, reduces wear between parts, and ensures smoother operation of the present invention.

[0036] The third driving device 600 includes a second cam 601 sleeved on the short shaft 43, a first thread-taking lever 7 disposed on one side of the second cam 601 and driven by the second cam 601 to swing the thread-taking device 6, a second thread-taking lever 8 disposed on the other side of the second cam 601, and a top rod 90 disposed on the bracket 100 and driven by the second thread-taking lever 8 to push the thread-taking device 6 to move laterally. Here, the second cam 601 can simultaneously drive the first thread-taking lever 7 and the second thread-taking lever 8 to work, so as to drive the thread-taking device 6 to swing up and down and laterally, and the pressure balance of the first thread-taking lever 7 and the second thread-taking lever 8 on the second cam 601 makes the rotation of the device easier and smoother.

[0037] The linkage assembly 3 includes a universal joint 31 connected to and driven by the first cam 42 for reciprocating motion, a first offset shaft 32 for limiting the universal joint 31 to the first cam 42, a washer 33 disposed between the universal joint 31 and the first cam 42, a swing block 34 connected to and driven by the universal joint 31 for swinging motion, and a connector 35 passing through the connection between the universal joint 31 and the swing block 34; the swing block 34 includes a swing end 341 and a fixed end 342, wherein the fixed end 342 is tightly clamped to the needle arm shaft 301 and used to drive the needle arm shaft 301 to move. Rotation; Here, the universal joint 31 of the linkage assembly 3 is vertically connected to the first cam 42 in an eccentric manner through the first off-axis 32. In the limited structure, the universal joint 31 is perpendicular to or intersects with the short shaft 43, changing the direction of transmission. When the short shaft 43 drives the first cam 42 to rotate, it will drive the universal joint 31 to reciprocate, thereby driving the swing block 34 to swing. Since the swing block 34 and the needle arm 302 are both fixed on the needle arm shaft 301, transmission can be realized, driving the needle arm 302 to swing, improving transmission efficiency, ensuring that the invention operates more smoothly, with less noise and a longer service life.

[0038] Preferably, the upper end of the universal joint 31 is provided with a first universal ball joint hole 311 for the first off-axis 32 to pass through, and the lower end of the universal joint 31 is provided with a second universal ball joint hole 312 for the connector 35 to pass through, and the distribution direction of the first off-axis 32 is perpendicular to the distribution direction of the connector 35.

[0039] The needle swing lever 5 includes a needle swing rod body 51, a third contact bearing 52 disposed at the upper end of the needle swing rod body 51 and forming rolling contact with the outer edge of the first cam 42, a first crossbar 53 connected to the lower end of the needle swing rod body 51, and a pusher 54 disposed at the end of the first crossbar 53 and pushed against the fixed end 342. The middle part of the needle swing rod body 51 is limited to the bearing seat 41 by a first bolt 511, so that the upper and lower ends of the needle swing rod body 51 can swing with the first bolt 511 as the fulcrum. Here, during operation, the short shaft 43 drives the first cam 42 to rotate, and the third contact bearing 52 at the upper end of the needle swing rod 51 forms a rolling contact with the first cam 42 to drive the lower end of the needle swing rod 51 to swing. Then, the first crossbar 53 drives the push head 54 to move, so as to push against the fixed end 342 of the swing block 34 and push the needle arm 302 of the needle arm shaft 301 to move laterally backward. The spring 304 is compressed. Subsequently, the first cam 42 continues to rotate, and the spring 304 drives the needle arm shaft 301 and the needle arm 302 forward and reset through its elastic force. At the same time, the push head 54 and the first crossbar 53 also reset, and drive the needle swing rod 51 and the third contact bearing 52 to reset. This process is repeated to realize the driving of the needle arm shaft 301 and the needle arm 302 to move back and forth.

[0040] Preferably, the hook assembly 30 includes a needle arm shaft 301 mounted on the bracket 100, a needle arm 302 mounted on the needle arm shaft 301, a spring 304 sleeved on the needle arm shaft 301 and pressing against the bracket 100 and the connecting rod assembly 3, and a large needle 303 mounted at the end of the needle arm 302. Here, the first cam 42 synchronously drives the needle swing lever 5 and the connecting rod assembly 3 to work, thereby causing the needle arm shaft 301 to swing and move backward, thus driving the large needle 303 at the end of the needle arm 302 to move.

[0041] The first line-taking lever 7 includes a first rod 71, a first contact bearing 72 disposed at the upper end of the first rod 71 and forming rolling contact with the second cam 601, and a first fulcrum shaft 73 for positioning the first rod 71 on the bracket 100. The first rod 71 also extends to form a first support arm 711 on its side. The first support arm 711 is provided with a pressure head 712 for abutting against the upper end of the piston rod 66. The first rod 71 is in the shape of an "r" or a reverse "r". The second line-taking lever 8 includes a second rod 81, a second contact bearing 82 disposed at the upper end of the second rod 81 and forming rolling contact with the second cam 601, and a second fulcrum shaft 83 for positioning the second rod 81 on the bracket 100. The second rod 81 extends downward to form a second support arm 811. The second support arm 811 is formed with an abutting part 812 for abutting against the top rod 90. Here, the lever principle is utilized. A first contact bearing 72, in conjunction with a specially shaped (R-shaped) first rod 71, changes the direction of force transmission, converting the circumferential rotational force of the second cam 601 into downward pressure to drive the piston rod 66 downward, effectively improving transmission efficiency. It can be understood that the second line-lifting lever 8 also utilizes the lever principle, converting the circumferential rotational force of the second cam 601 into the swinging force of the second support arm 811, thereby pushing the push rod 90 to move laterally.

[0042] It also includes: a housing oil storage assembly 9, which is covered and disposed outside the bracket 100. The housing oil storage assembly 9 includes a lower cover 91 and an upper cover 92 covering the lower cover 91. The lower cover 91 has an oil storage tank 911 for containing lubricating oil. The main shaft 1 passes through the oil storage tank 911. The oil storage tank 911 is also provided with an oiling component 912. The oiling component 912 is fixed to the main shaft 1 by self-tapping screws and rotated by the main shaft 1 to splash the lubricating oil in the oil storage tank 911 upwards. The oiling component 912 includes a positioning cylinder 9121 sleeved on the main shaft 1 and at least one oil stirring blade 9122 integrally formed with the positioning cylinder 9121 and extending into the oil storage tank 911 to stir the lubricating oil. The positioning cylinder 9121 has a plurality of self-tapping screw holes 9123 distributed circumferentially for inserting self-tapping screws. The surface of the oil stirring blade 9122 is curved to increase the contact area with the lubricating oil and facilitate the splashing of lubricating oil. The curved surface of the oil stirring blade 9122 can increase the contact area with the lubricating oil and is more conducive to stirring the lubricating oil, thereby improving lubrication efficiency.

[0043] Combination Figure 11 and Figure 12As shown, the upper cover 92 has an oil filling opening 923 for adding lubricating oil into the oil reservoir 911. The oil filling opening 923 is covered by an oil filling cap 922. The oil filling cap 922 has a U-shaped outline, and the lower end of the oil filling cap 922 has several connecting protrusions 9221 for matching and installing with the upper cover body 921. Several connecting buckles 9222 are also formed on the side of the oil filling cap 922. The upper cover body 921 has a matching connecting groove 9211 at the position corresponding to the connecting protrusions 9221. The upper cover body 921 also has a connecting ear 9212 at the position corresponding to the connecting buckle 9222. In addition, an oil storage port 919 is provided on the oil storage tank 911, and a recovery tank 917 for collecting overflowing lubricating oil is provided inside the lower cover 91. The recovery tank 917 is funnel-shaped, and the horizontal position of the recovery tank 917 is lower than the horizontal position of the oil storage tank 911. A recovery hole 918 penetrating the lower cover 91 is also provided at the bottom of the recovery tank 917. When there is too much lubricating oil in the oil storage tank 911 or when the oil stirring blade 9122 splashes lubricating oil, it will flow out along the oil storage port 919 on the side baffle of the oil storage tank 911 and flow into the recovery tank 917. Since the recovery tank 917 is roughly funnel-shaped, the lubricating oil will eventually flow to the recovery hole 918 and then flow into the external oil receiving box through the recovery hole 918.

[0044] The transmission structure 50 includes a first synchronous gear 501 sleeved on the end of the main shaft 1, a second synchronous gear 502 sleeved on the short shaft 43, a first support seat 503 mounted on the bracket 100 and used to support the short shaft 43, a third tensioning wheel 504 disposed on the first support seat 503, a first synchronous belt 505 tractably connected between the first synchronous gear 501 and the second synchronous gear 502 and passing over the third tensioning wheel 504, and a support rod 506 inserted into the bracket 100 and used to support the first support seat 503. The first support seat 503 is also provided with a third tensioning positioning shaft 315 for adjusting the relative position of the third tensioning wheel 504.

[0045] In this invention, the transmission structure 50 uses a first synchronous belt 505 in conjunction with a first synchronous gear 501 and a second synchronous gear 502 to drive the main shaft 1 and the short shaft 43 to rotate synchronously. No lubrication is required, and there is little wear during operation. It is suitable for high-speed operation of the machine and effectively improves the transmission efficiency. Moreover, this structure makes the longitudinal interval between the support 100 and the carriage 200 large, and makes the space between the support 100 and the needle plate 2 larger.

[0046] Preferably, the third tensioning positioning shaft 315 includes a connecting end 3151 inserted into the first support base 503 and an eccentric end 3152 eccentrically disposed on the connecting end 3151; the eccentric end 3152 is further provided with a third bearing 316, and the third tensioning wheel 504 is interference-fitted onto the third bearing 316. When the third tensioning positioning shaft 315 rotates, it can change the relative position between the third tensioning wheel 504 and the first synchronous belt 504, thereby adjusting the tension of the first synchronous belt 504, effectively improving its service life and further reducing noise.

[0047] The thread-taking device 6 includes: a fixed sleeve 61 installed on the outside of the bracket 100; a thread-taking sliding sleeve 62 disposed in the fixed sleeve 61; an abutting block 63 fixedly connected to the thread-taking sliding sleeve 62 and abutting one end of the top rod 90; a striking plate positioning seat 64 fixedly connected to the thread-taking sliding sleeve 62; a striking plate 65 installed in the striking plate positioning seat 64; and a piston rod 66 movably embedded in and passing through the thread-taking sliding sleeve 62. The lower end of the piston rod 66 is also provided with a roller 67 for abutting against the striking plate 65, and the upper end of the piston rod 66 abuts against the first thread-taking lever 7. The middle part of the striking plate 65 is pivotally connected to the striking plate positioning seat 64. Both the front and rear ends of the striking plate 65 extend beyond the front and rear ends of the striking plate positioning seat 64. The rear end of the striking plate 65 is connected to the rear end of the striking plate positioning seat 64 through a first reset structure and is used to drive the striking plate 65 to reset. The first reset structure is a double spring 10. A thread-taking triangle 651 is also installed at the front end of the striking plate 65. Here, the plate-forming positioning seat 64 also extends to form a first clamping arm 645 and a second clamping arm 646. This structure ensures that the plate-forming 65 will not swing left and right relative to the plate-forming positioning seat 64 during high-intensity operation, thereby improving working stability. In addition, a roller 67 is provided at the contact point between the piston rod 66 and the plate-forming 65, which can effectively reduce wear and improve working accuracy and service life.

[0048] Preferably, the sheet-forming positioning seat 64 is provided with a mounting groove 641, the sheet-forming piece 65 is installed in the middle of the mounting groove 641, and the sheet-forming positioning seat 64 is provided with a first hole 642 penetrating the mounting groove 641. A first bearing 643 is accommodated in the first hole 642. A bearing screw 645 passes through the first bearing 643, the mounting groove 641, and the sheet-forming fulcrum hole 644 in the sheet-forming piece 65, and is then fixed with a nut 649, so that the bearing screw 645 fixes the inner diameter of the sheet-forming piece 65 to the inner diameter of the first bearing 643. The top end of the fixing sleeve 61 and the thread-taking slide sleeve 62 are stably connected by a plane bearing 646. Here, the bearing screw 645 and the nut 649 cooperate to fix the inner diameter of the sheet-forming piece 65 to the inner diameter of the first bearing 643, so that the bearing screw 645 will not rub against the sheet-forming piece 65, and at the same time, it can also prevent friction with the sheet-forming positioning seat 54, which greatly reduces the wear between the parts.

[0049] The main shaft 1 is assembled with the carriage 200 via a first bushing 110 and several first bearings. The main shaft drive device 300 includes a drive motor 305 mounted on the carriage 200, a third synchronous pulley 306 connected to the main shaft 1, and a third synchronous belt 307 that passes around the third synchronous pulley 306 and the output end of the drive motor 305 in a transmissive manner. The first drive device 400 includes a worm 401 sleeved on the main shaft 1, a central gear shaft 402 that is perpendicular to the main shaft 1 and passes through the carriage 200 and is connected to the needle plate 2, and a worm wheel 403 sleeved on the central gear shaft 402 and meshing with the worm 401.

[0050] In summary, this invention replaces the traditional bevel gear with an adjustable transmission structure, which not only effectively reduces noise and simplifies maintenance costs, but also increases the space between the main shaft 1 and the short shaft 43, significantly improving ease of use and making it suitable for application in various sewing machine structures. Furthermore, compared to existing structures, this invention improves transmission efficiency by balancing the pressure between the first thread take-up lever 7 and the second thread take-up lever 8 of the third drive device 600 and the second cam 601, making the equipment rotate more smoothly and easily. This invention also includes a housing oil storage assembly 9 to lubricate the most easily worn connecting rod assembly 3, achieving oil recycling and extending the service life of the invention.

[0051] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A high-speed, large-space sewing machine without umbrella teeth, comprising: The machine tool (200), a bracket (100) installed on the side of the machine tool (200), a main shaft (1) passing through the machine tool (200) and the bracket (100), a main shaft drive device (300) installed on the outside of the machine tool (200) for driving the main shaft (1) to rotate, a needle plate (2) installed at the lower end of the machine tool (200), a first drive device (400) installed in the machine tool (200) and linked to the main shaft (1) for driving the needle plate (2) to rotate, a hook assembly (30) installed on the outside of the bracket (100) and cooperating with the needle plate (2), a second drive device (500) installed in the bracket (100) for driving the hook assembly (30) to swing, a thread take-up device (6) installed on the outside of the bracket (100), and a third drive device (600) installed in the bracket (100) for driving the thread take-up device (6) to work, characterized in that: The bracket (100) is provided with an auxiliary shaft structure (4), and a transmission structure (50) is also provided between the main shaft (1) and the auxiliary shaft structure (4). The auxiliary shaft structure (4) includes a bearing seat (41) disposed on the bracket (100), a first cam (42) disposed on the bearing seat (41) and used to drive the hook assembly (30) to swing, and a short shaft (43) passing through the bearing seat (41). The second drive device (500) includes a connecting rod assembly (3) that is transmissively disposed between the first cam (42) and the hook assembly (30) and a needle swing lever (5) disposed at the outer end of the bearing seat (41) and driven by the first cam (42) to push the hook assembly (30) to move laterally. The third driving device (600) includes a second cam (601) sleeved on the short shaft (43), a first thread-taking lever (7) disposed on one side of the second cam (601) and driven by the second cam (601) to swing the thread-taking device (6), a second thread-taking lever (8) disposed on the other side of the second cam (601), and a top rod (90) disposed on the bracket (100) and driven by the second thread-taking lever (8) to push the thread-taking device (6) to move laterally.

2. The high-speed, large-space sewing machine without umbrella teeth according to claim 1, characterized in that: The hook assembly (30) includes a needle arm shaft (301) disposed on the bracket (100), a needle arm (302) mounted on the needle arm shaft (301), a spring (304) sleeved on the needle arm shaft (301) and pressing against the bracket (100) and the connecting rod assembly (3), and a large needle (303) mounted on the end of the needle arm (302).

3. The high-speed, large-space sewing machine without umbrella teeth according to claim 2, characterized in that: The linkage assembly (3) includes a universal joint (31) connected to and driven by the first cam (42) to reciprocate; a first offset shaft (32) that limits the universal joint (31) to the first cam (42); a washer (33) disposed between the universal joint (31) and the first cam (42); a swing block (34) connected to and driven by the universal joint (31) to swing; and a connector (35) passing through the connection between the universal joint (31) and the swing block (34); the swing block (34) includes a swing end (341) and a fixed end (342), wherein the fixed end (342) is tightly clamped to The needle arm shaft (301) is used to drive the needle arm shaft (301) to rotate; the needle swing lever (5) includes a needle swing rod body (51), a third contact bearing (52) disposed at the upper end of the needle swing rod body (51) and forming rolling contact with the outer edge of the first cam (42), a first crossbar (53) connected to the lower end of the needle swing rod body (51), and a push head (54) disposed at the end of the first crossbar (53) and pushed against the fixed end (342). The middle part of the needle swing rod body (51) is limited to the bearing seat (41) by the first bolt (511) so that the upper and lower ends of the needle swing rod body (51) can swing with the first bolt (511) as the fulcrum.

4. The high-speed, large-space sewing machine without umbrella teeth according to claim 1, characterized in that: The first line-picking lever (7) includes a first rod (71), a first contact bearing (72) disposed at the upper end of the first rod (71) and forming rolling contact with the second cam (601), and a first fulcrum shaft (73) for positioning the first rod (71) on the bracket (100). The first rod (71) also extends to form a first arm (711) on its side, and the first arm (711) is provided with a pressure head (712) for abutting against the upper end of the piston rod (66). (71) It is in the shape of an "r" or an inverted "r"; the second line-picking lever (8) includes a second rod (81), a second contact bearing (82) disposed at the upper end of the second rod (81) and forming a rolling contact with the second cam (601), and a second fulcrum shaft (83) for positioning the second rod (81) on the bracket (100). The second rod (81) extends downward to form a second arm (811), and the second arm (811) has an abutment portion (812) formed on it for abutting against the top rod (90).

5. The high-speed, large-space sewing machine without umbrella teeth according to claim 1, characterized in that: Also includes: The housing oil storage assembly (9) is enclosed outside the bracket (100). The housing oil storage assembly (9) includes a lower cover (91) and an upper cover (92) covering the lower cover (91). The lower cover (91) has an oil storage tank (911) for holding lubricating oil. The main shaft (1) passes through the oil storage tank (911). The oil storage tank (911) is also provided with an oiling component (912). The oiling component (912) is fixed to the main shaft (1) by self-tapping screws and rotated by the main shaft (1) to splash the lubricating oil in the oil storage tank (911) upward. The oiling component (912) includes a positioning cylinder (9121) sleeved on the main shaft (1) and at least one oil stirring blade (9122) integrally formed with the positioning cylinder (9121) and extending into the oil storage tank (911) to stir the lubricating oil.

6. The high-speed, large-space sewing machine without umbrella teeth according to claim 1, characterized in that: The transmission structure (50) includes a first synchronous gear (501) sleeved on the end of the main shaft (1), a second synchronous gear (502) sleeved on the short shaft (43), a first support seat (503) mounted on the bracket (100) and used to support the short shaft (43), a third tensioning wheel (504) disposed on the first support seat (503), a first synchronous belt (505) that is transmissively connected between the first synchronous gear (501) and the second synchronous gear (502) and passes over the third tensioning wheel (504), and a support rod (506) inserted on the bracket (100) and used to support the first support seat (503).

7. The high-speed, large-space sewing machine without umbrella teeth according to claim 1, characterized in that: The thread-taking device (6) includes: a fixed sleeve (61) installed on the outside of the bracket (100), a thread-taking slide sleeve (62) set in the fixed sleeve (61), an abutment block (63) fixedly connected to the thread-taking slide sleeve (62) and abutting one end of the top rod (90), a striking plate positioning seat (64) fixedly connected to the thread-taking slide sleeve (62), a striking plate (65) installed in the striking plate positioning seat (64), and a piston rod (66) movably embedded and passing through the thread-taking slide sleeve (62). The lower end of the piston rod (66) is also provided with a roller (67) for abutting against the striking plate (65), and the upper end of the piston rod (66) abuts against the first thread-taking lever (7).

8. The high-speed, large-space sewing machine without umbrella teeth according to claim 7, characterized in that: The middle part of the striking plate (65) is pivotally connected to the striking plate positioning seat (64). Both the front and rear ends of the striking plate (65) extend beyond the front and rear ends of the striking plate positioning seat (64). The rear end of the striking plate (65) is connected to the rear end of the striking plate positioning seat (64) through the first reset structure and is used to drive the striking plate (65) to reset. The first reset structure is a double spring (10). The front end of the striking plate (65) is also equipped with a wire-picking triangle (651).

9. A high-speed, large-space sewing machine without umbrella teeth according to claim 8, characterized in that: The punching positioning seat (64) is provided with an installation groove (641), the punching piece (65) is installed in the middle of the installation groove (641), and the punching positioning seat (64) is provided with a first hole (642) that penetrates the installation groove (641) inward, and a first bearing (643) is accommodated in the first hole (642). A bearing screw (645) passes through the first bearing (643), the installation groove (641) and the punching fulcrum hole (644) in the punching piece (65) and is fixed with a nut (649) so that the bearing screw (645) fixes the inner diameter of the punching piece (65) and the first bearing (643); the top end of the fixing sleeve (61) and the take-up sleeve (62) are stably connected by a plane bearing (646).

10. A high-speed, large-space sewing machine without umbrella teeth according to any one of claims 6-9, characterized in that: The main shaft (1) is assembled with the carriage (200) via a first bushing (110) and several first bearings (111). The main shaft drive device (300) includes a drive motor (305) mounted on the carriage (200), a third synchronous pulley (306) connected to the main shaft (1), and a third synchronous belt (307) that passes around the third synchronous pulley (306) and the output end of the drive motor (305) in a transmissive manner. The first drive device (400) includes a worm (401) sleeved on the main shaft (1), a central gear shaft (402) that is perpendicular to the main shaft (1) and passes through the carriage (200) and is connected to the needle plate (2), and a worm wheel (403) sleeved on the central gear shaft (402) and meshing with the worm (401).

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