A sewing machine in which an upper thread mechanism and a lower thread mechanism rotate in coordination to sew

Abstract

The present application proposes a sewing machine in which an upper thread mechanism and a lower thread mechanism rotate in coordination for sewing, and specifically relates to the technical field of sewing machine manufacturing. The sewing machine has an upper thread mechanism, a lower thread mechanism and a needle plate, wherein the upper thread mechanism and the lower thread mechanism rotate in coordination with the machine needle as the central axis for sewing, and the lower thread mechanism has a fixed seat connected to the needle plate; the upper thread mechanism is mounted and fixed on the output shaft of the upper thread drive motor, and the upper thread drive motor rotates with the machine needle as the central axis, and the lower thread mechanism is mounted on the output shaft of the lower thread drive motor, and the lower thread drive motor rotates with the machine needle as the central axis. The rotary intelligent sewing machine of the present application cleverly separates the upper thread mechanism and the lower thread mechanism in structure and power. The sewing of the special stitches of the sewing machine of the present application is effective, and can be applied to the sewing of different sewing products, and the special sewing function can also be applied to different sewing machines, which has high practicality and a broad market prospect.

Description

Technical Field

[0001] The present application provides a sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate to rotate for sewing, and specifically relates to the technical field of sewing machine manufacturing. Background Art

[0002] Sewing machines are sewing equipment for sewing clothes, bags, shoes, hats, and bedding. The sewing process of sewing machines is actually a process of feeding and sewing by the feed dog, presser foot, and needle. When the sewing machine starts to sew, the fabric is placed under the presser foot to be sewn. First, the presser foot drops to contact and press the fabric, and the feed dog is lifted to the bottom of the fabric. The presser foot and the feed dog move relative to each other synchronously to engage the fabric. At the same time, the needle follows the presser foot to reach the surface of the fabric synchronously, and the needle pierces the fabric with the upper thread and the lower thread. Then, the presser foot and the feed dog both feed backwards at the same time, and the needle retreats rhythmically with the fabric and inserts the needle rhythmically. The needle and the hook of the rotary shuttle jointly complete the sewing of the upper thread and the bottom thread to achieve sewing. When the feeding is finished, the presser foot is lifted off the fabric, the feed dog drops off the lower end of the fabric, and at the same time, the needle is lifted off the fabric. The above is the feeding action of the sewing equipment, which we call three-synchronous sewing. The three-synchronous sewing of the above-mentioned sewing machine has the disadvantage that the seam cannot turn. If it needs to turn, the presser foot must be lifted, the fabric must be twisted to reach the desired angle, and then straight sewing can be continued. Therefore, it is difficult for the sewing machine to complete the sewing of complex seams with curved seams. This is the result of the combined effect of the unique design between the presser foot and the feed dog.

[0003] In addition, in order to meet the needs of different sewing, sewing machines have appeared on the market, including bartacking machines, zigzag sewing machines, buttonhole machines, embroidery machines and many other models. For clothing production companies, they need to purchase a variety of models to meet the production needs of different sewing. However, after using various sewing machines for a period of time, the business volume decreases and various models of sewing machines are often idle, resulting in relatively low efficiency of sewing machines. The above sewing machines have different sewing stitches, so their versatility is out of the question. Different models have different sewing functions, which restricts the development of sewing machine technology. Summary of the invention

[0004] In view of the problem that the existing sewing machine technology has low sewing versatility, the present application provides a sewing machine that integrates the functions of a sewing machine, a bar tacking machine, a zigzag sewing machine, a buttonhole machine and an embroidery machine into a sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate to rotate for sewing, and the upper thread mechanism and the lower thread mechanism cooperate to rotate with the machine needle as the central axis for sewing, and the lower thread mechanism has a fixed seat connected to the needle plate.

[0005] Furthermore, the upper thread mechanism is fixedly mounted on the output shaft of the upper thread drive motor, and the upper thread drive motor rotates around the needle as the center axis. The lower thread mechanism is mounted on the output shaft of the lower thread drive motor, and the lower thread drive motor rotates around the needle as the center axis.

[0006] Preferably, the bottom thread mechanism has a fixed seat and a bottom thread driving motor, a feed dog assembly, a rotary hook assembly and a thread trimming assembly are arranged inside the fixed seat, the bottom thread driving motor is fixed on the fixed bracket, the output shaft of the bottom thread driving motor passes through the bottom plate of the fixed bracket and is connected to the fixed seat, the bottom thread driving motor controlled by the controller drives the fixed seat together with the feed dog assembly, rotary hook assembly and thread trimming assembly inside the fixed seat to rotate during sewing.

[0007] Preferably, the thread-up mechanism comprises a needle bar assembly, a presser foot lifting assembly and a thread-receiving assembly; the thread-down mechanism comprises a feed dog assembly, a rotary hook assembly and a thread-cutting assembly.

[0008] Preferably, the needle bar assembly has a power source that drives the rotating disk to rotate, and a moving connecting rod is connected to the eccentric position of the rotating disk. The moving connecting rod drives the needle crank, and the needle crank drives the needle to move up and down.

[0009] Preferably, the presser foot lifting assembly has a presser foot lifting power source that drives the presser foot cam to rotate, and the presser foot cam acts on a cam action plate on the upper part of the presser foot rod. An elastic part is installed between the cam action plate and the machine head of the sewing machine and is sleeved on the presser foot rod. The presser foot lifting power source drives the above-mentioned related components to lift the presser foot.

[0010] Preferably, the wire-taking assembly has a power source driving a rotating disk and a moving connecting rod, the moving connecting rod is connected to an eccentric position of a wire-taking sub-disk, the wire-taking sub-disk is synchronized with the wire-taking disk, and a wire-taking column is provided on the wire-taking disk.

[0011] Preferably, the feed dog assembly has a swinging power source that drives the turntable and then drives the connecting rod, so that the feed dog connecting frame makes a left-right swinging motion to satisfy the feed dog, and the up-and-down lifting motor of the feed dog assembly is fixed on the bottom of the fixed seat of the sewing machine, and the up-and-down lifting motor drives the support frame to make an up-and-down swinging motion to satisfy the feed dog.

[0012] Preferably, the rotary hook fixing seat of the rotary hook assembly is fixed, a thread rack is placed inside the rotary hook fixing seat, and an anti-slip cover plate is arranged outside the thread rack. The rotary hook assembly has a hollow rotating shaft of a rotary hook power source to drive the hook needle to hook the sewing upper thread on the needle and the sewing lower thread of the thread rack inside the suspended rotary hook to form a knot;

[0013] Preferably, the thread trimming assembly has a thread trimming power source that pushes the thread trimming connecting rod to the notch of the hollow rotating shaft, and the rotary hook power source drives the hollow rotating shaft to rotate the thread trimming connecting rod to complete the thread trimming action.

[0014] Compared with the prior art, the beneficial effects of the present application are as follows: a sewing machine in which the upper thread mechanism and the lower thread mechanism cooperate to rotate for sewing in the present application cancels the mechanical transmission mechanism of the traditional sewing machine and realizes the lubrication-free operation of the sewing machine; the rotary intelligent sewing machine of the present application cleverly separates the upper thread mechanism and the lower thread mechanism in structure and power, and the upper thread mechanism and the lower thread mechanism can rotate synchronously to complete sewing, thereby realizing the intelligent control of sewing to the greatest extent, not only having the advantages of high practicality and strong versatility, but also having more functions and higher cost performance of the sewing machine. The present invention has epoch-making and historic innovative value in the sewing machine industry. The sewing of the special stitches of the sewing machine of the present application is effective, can be applied to the sewing of different sewing products, and can also apply the special sewing function to different sewing machines, which has high practicality and broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate with each other to rotate for sewing;

[0016] Figure 2 This is a schematic diagram of an upper thread mechanism and a lower thread mechanism of a sewing machine in which the upper thread mechanism and the lower thread mechanism cooperate to rotate for sewing;

[0017] Figure 3 It is a schematic diagram of a bobbin thread mechanism of a sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate to rotate for sewing;

[0018] Figure 4 It is a schematic diagram of an upper thread mechanism and an auxiliary presser foot mechanism of a sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate to rotate for sewing;

[0019] Figure 5 It is a schematic diagram of a feed dog assembly of a sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate to rotate for sewing;

[0020] Figure 6 It is a schematic diagram of a first and second tooth-lifting cam of a sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate to rotate for sewing according to the present application;

[0021] Figure 7 It is a rear view of a feed dog assembly of a sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate to rotate for sewing;

[0022] Figure 8 It is a schematic diagram of a feed dog and a feed dog connecting frame of a sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate to rotate for sewing in the present application;

[0023] Fig. 9It is a schematic diagram of a multi-stage cam of a feed dog assembly of a split-type sewing machine of the present application;

[0024] Fig.10 It is a schematic diagram of the feed dog rear tilt feeding of a separate sewing machine of the present application;

[0025] Fig.11 It is a schematic diagram of the forward tilted feeding of the feed dog of a separate sewing machine of the present application;

[0026] Fig.12 It is a schematic diagram of a thread trimming assembly of a sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate to rotate for sewing according to the present application;

[0027] Fig.13 This is a schematic diagram of a thread trimmer push rod of a sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate to rotate for sewing;

[0028] Fig.14 This is a diagram of the internal structure of a thread trimmer push rod of a sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate to rotate for sewing;

[0029] Fig.15 It is a schematic diagram of a rotary hook assembly of a sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate to rotate for sewing.

[0030] Fig.16 This is a schematic diagram of an outer presser foot of a sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate to rotate for sewing;

[0031] Fig.17 It is a schematic diagram of a pattern stitch of a sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate to rotate for sewing;

[0032] Fig.18 It is a schematic diagram of intermittent stitches of a pattern sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate to rotate for sewing;

[0033] Fig.19 It is a schematic diagram of the stitch of a flat-head buttonhole machine of a sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate to rotate for sewing;

[0034] Fig. 20 It is a schematic diagram of the eyelet buttonhole stitch of a sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate to rotate for sewing;

[0035] Fig.21 It is a schematic diagram of a zigzag stitch of a sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate to rotate for sewing;

[0036] Fig. 22 It is a schematic diagram of the zigzag angle swing stitch of a sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate to rotate for sewing in the present application.

[0037] 16, the presser foot cam 163, the cam action plate 164, the elastic member 165, the presser foot rod 166, the take-up assembly 17, the take-up sub-disk 171, the take-up disk 172, the connecting shaft 173, the take-up column 174, the clamping wire Device 1 175, thread clamp 2 176, thread pull groove 177, bottom line mechanism 20, fixed seat 23, bottom line drive motor 24, feed tooth assembly 25, feed tooth 251, up and down lifting motor 252, front and rear feed motor 253, feed tooth connecting frame 254, support frame 255, tooth lifting cam 1 256, tooth lifting cam 257, needle plate 258, fixed copper sleeve 259, drive end swing rod 25a, copper sleeve swing rod 25b, turntable 25e, connecting rod 25f, bracket 250 , support rod 25c, groove 25d, hook assembly 26, suspended hook 261, hook power source 262, slide bar 262a, notch 262c, hook needle 263, fixed rod 264, hook fixing seat 265, anti-slip cover plate 266, hollow shaft 267, thread rack 268, thread trimming assembly 27, thread trimming power source 271, thread trimming connecting rod 272, push block 272a, connecting rod end 272b, slide groove 272c, thread trimming power source bracket 27e, elastic member 2 273, main Knife 274, main push knife connecting rod 275, push secondary knife 276, thread trimming bracket 277, main push knife holder 278, secondary push knife connecting rod 279, push knife holder 270, frame 30, long arm end 31, operation panel 40, controller 50, table 60, fixed bracket 61, outer presser foot mechanism 70, outer presser foot 71, outer presser foot connecting rod 72, fixed plate 73, outer presser foot driving source 74, multi-stage cam one 91, multi-stage cam two 92, adjust high point 912, adjust low point 913. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present application are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present application can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present application. These implementation modes are only used to illustrate the present invention, and are not intended to limit the present invention.

[0039] Figure 1 Figure 2This is a structural schematic diagram of a sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate to rotate for sewing. The sewing machine comprises an upper thread mechanism 10, a lower thread mechanism 20, a frame 30, an operating panel 40, a controller 50 and a table 60. The upper thread mechanism 10 is adjacent to the long arm end 31 of the frame 30 and fixes the long arm end 31, the operating panel 40 is fixed to the frame 30, the operating surface of the operating panel 40 faces the operator, and the frame 30 is fixed on the table 60. The lower thread mechanism 20 and the controller 50 are fixed under the table 60, and the lower thread mechanism 20 can also be fixed between the table 60 and the fixed bracket 61. The upper thread mechanism 10 and the lower thread mechanism 20 constitute the sewing system of the sewing machine. Under the premise of sewing straight stitches, the controller 50 of the sewing machine controls the upper thread mechanism 10 and the lower thread mechanism 20 to rotate together to perform special stitch sewing. The presser foot 161 and the needle 152 of the upper thread mechanism 10 and the feed dog 251 and the suspended rotary hook 261 of the lower thread mechanism 20 rotate together to perform sewing, and the stitch length can be adjusted by using the relevant power source, so that the upper thread mechanism 10 and the lower thread mechanism 20 can sew special stitches in a rotating state under the control of the sewing machine controller 50. The sewing machine achieves the sewing effect of a flat-sewing machine, a pattern machine, a buttonhole machine and other models, and embodies the technical effect of multi-purpose.

[0040] Combination Figure 1 Figure 2 The head 11 of the upper thread mechanism 10 of the sewing machine is driven to rotate by the upper thread driving motor 12. The upper thread driving motor 12 is installed on the head 11, or the upper thread driving motor 12 can also be installed in a lateral position and then mechanically drive the head 11 to rotate. The head 11 is fixed on the output shaft of the upper thread driving motor 12, and the upper thread driving motor 12 is controlled by the controller 50. The upper thread driving motor 12 drives the head 11 to rotate during the sewing process. The upper thread mechanism 10 is composed of a needle bar assembly 15, a presser foot lifting assembly 16 and a take-up assembly 17. The upper thread driving motor 12 drives the head 11 to rotate together with the needle bar assembly 15, the presser foot lifting assembly 16 and the take-up assembly 17 during the sewing process to achieve special stitch sewing. The upper thread mechanism 10 also has an external presser foot mechanism 70, and the external presser foot mechanism 70 is fixed to the long arm end 31.

[0041] exist Figure 2 In the sewing machine, the upper thread driving motor 12 executes the rotation movement of the machine head 11 under the control of the controller 50. The rotation movement center of the machine head 11 is coaxially and concentrically arranged with the needle 152 as the central axis, that is, the above-mentioned machine head 11 rotates with the needle 152 as the central axis, so the sewing machine head 11 has the function of rotating together with the needle bar assembly 15, the presser foot lifting assembly 16 and the thread taking-up assembly 17.

[0042] Figure 2In the figure, the needle bar assembly 15 comprises a needle 152, a power source 153, a rotating disk 154, a moving link 155 and a needle crank 156. The power source 153 drives the rotating disk 154 to rotate, and a moving link 155 is connected to the eccentric position of the rotating disk 154. The moving link 155 is connected to the needle crank 156 to which the needle 152 is fixed. The moving link 155 drives the rotating disk 154 to make the needle 152 reciprocate up and down, and the needle 152 has a sewing function.

[0043] exist Figure 2 In the embodiment, the presser foot lifting assembly 16 comprises a presser foot 161, a presser foot lifting power source 162, a presser foot cam 163, a cam action plate 164, a presser foot rod 166 and an elastic member 165. The presser foot lifting power source 162 drives the presser foot cam 163 to perform a rotational action, and the presser foot cam 163 acts on the cam action plate 164 fixed on the presser foot rod 166. An elastic member 165 is installed between the cam action plate 164 and the machine head 11, and the elastic member 165 is sleeved on the presser foot rod 166. The presser foot lifting power source 162 outputs torque in a rotational manner to drive the presser foot rod 166 and the presser foot 161 to perform a presser foot lifting action. The presser foot 161 of the present application is in a normal pressure state. When the presser foot is to be lifted, the presser foot lifting power source 162 rotates to make the presser foot cam 163 leave the cam action plate 164, and the elastic force of the elastic member 165 pushes the cam action plate 164 to lift the presser foot rod 166 and the presser foot 161. When the presser foot is to be pressed, the presser foot lifting power source 162 rotates so that the presser foot cam 163 presses the cam action plate 164, the cam action plate 164 presses the presser foot rod 166 downward, and the elastic member 165 is compressed between the cam action plate 164 and the machine head 11. During the sewing process, the elastic member 165 always gives the presser foot 161 a maintaining elastic state between the cam action plate 164 and the machine head 11, so that the presser foot 161 is under normal pressure.

[0044] exist Figure 2 Figure 4In the embodiment, the above-mentioned take-up assembly 17 has a power source 153, a rotating disk 154, a connecting shaft 173, a take-up sub-disk 171, a take-up disk 172, a clamp 175, and a clamp 2 176. The power source 153 of the above-mentioned take-up assembly 17 drives the rotating disk 154 and the connecting shaft 173, and the connecting shaft 173 finally drives the take-up disk 172 to implement the take-up action. The power source 153 transmits power to the rotating disk 154, and the rotating disk 154 then drives the connecting shaft 173 until the take-up disk 172 is driven. The rotation of the rotating disk 154 here can be driven directly by the power source 153, or it can be driven by connecting to its eccentric position in other ways. In short, the take-up disk 172 of the present application advocates a rotation torque. The above-mentioned take-up sub-disk 171 and the take-up disk 172 operate synchronously, and the take-up sub-disk 171 is optional here. The rotating disk 154 , the take-up sub-disk 171 and the take-up disk 172 are arranged concentrically, and a connecting shaft 173 for central connection and transmission is arranged between the take-up sub-disk 171 and the take-up disk 172 .

[0045] The take-up disk 172 is provided with a take-up post 174, and the take-up post 174 is provided with a wire pulling groove 177. The first clamp 175 clamps the sewing thread, and the sewing thread is then wrapped around the take-up post 174, and the sewing thread is then wound back to be clamped by the second clamp 176. The take-up disk 172 is indirectly driven to rotate by the power source 153, and the position of the take-up post 174 on the take-up disk 172 changes due to the rotation of the take-up disk 172 to implement the thread picking, so that the rotating take-up post 174 can take up and release the sewing thread, making it easier to pick up and thread the sewing thread, and the thread picking speed can be adjusted at any time by the power source 153. Since the above-mentioned take-up assembly 17 and needle bar assembly 15 both use the power source 153 as the output power, the operation of the needle 152 and the take-up disk 172 are synchronized and coordinated.

[0046] exist Figure 1 Fig.16 In the invention, the external presser foot mechanism 70 of the present application is introduced. A sewing machine in which an upper thread mechanism and a lower thread mechanism cooperate to rotate for sewing of the present application also has an external presser foot mechanism 70. The external presser foot mechanism 70 has: an external presser foot 71, an external presser foot connecting rod 72, a fixing plate 73 and an external presser foot driving source 74. The above-mentioned external presser foot mechanism 70 is adjacent to the upper thread mechanism 10, and the external presser foot driving source 74 of the external presser foot mechanism 10 is installed and fixed on the long arm end 31 of the frame 30. The feed dog 251 and the external presser foot driving source 74 drive the external presser foot 71 to press and release the sewing fabric on the table 60, and the external presser foot 71 also plays a technical effect of preventing the sewing fabric from sliding to the ground and being contaminated when the presser foot 161 is lifted. After the presser foot 161 and the feed dog 251 work together to finish sewing, the outer presser foot 71 is first lowered and then the presser foot 161 is lifted, so that the sewn fabric is positioned on the table 60 to ensure that the sewn fabric does not fall to the ground and is lost.

[0047] The above-mentioned outer presser foot 71 is pressed around the presser foot 161, and the outer presser foot 71 is circular / square / semicircular / special-shaped, etc. In short, the presser foot 161 is surrounded by the scope of the outer presser foot 71. The above-mentioned outer presser foot 71 is connected to the outer presser foot connecting rod 72, and the outer presser foot connecting rod 72 is connected to the fixed plate 73, and the fixed plate 73 is connected to the output shaft of the outer presser foot driving source 74. The outer presser foot driving source 74 performs the suction and release action to drive the fixed plate 73 to move, and the fixed plate 73 pushes the outer presser foot connecting rod 72 again, and the outer presser foot connecting rod 72 is linked with the outer presser foot 71 to realize the outer presser foot 71 on the table 60. Press or release the sewing cloth. During conventional sewing, the presser foot 161 sometimes needs to be lifted to change the next seam starting point of the sewing cloth. When the presser foot 161 leaves the sewing cloth, the operator presses the sewing cloth by hand in the prior art, which has a technical problem of inconvenient operation and also reduces the accuracy of the next sewing starting point. The present application specifically proposes the above-mentioned external presser foot mechanism 70 to assist the above-mentioned sewing work and improve the accuracy and stability of changing the sewing point.

[0048] exist Figures 1 to 5 The bottom line mechanism 20 of the present application is embodied in the figure. The bottom line mechanism 20 has a fixed seat 23 and a bottom line driving motor 24 in structure. The fixed seat 23 is provided with a feed dog assembly 25, a rotary hook assembly 26 and a thread trimming assembly 27. The feed dog assembly 25, the rotary hook assembly 26 and the thread trimming assembly 27 are also elements of the bottom line mechanism 20. The bottom line driving motor 24 is fixed on the fixed bracket 61. The output shaft of the bottom line driving motor 24 passes through the bottom plate of the fixed bracket 61 and is connected to the fixed seat 23. The bottom line driving motor 24 is installed on the bottom line mechanism 20. The fixed seat 23 (bottom line mechanism 20) rotates with the drive of the bottom line driving motor 24. The bottom line driving motor 24 controlled by the controller 50 drives the fixed seat 23 to rotate together with the feed dog assembly 25, the rotary hook assembly 26 and the thread trimming assembly 27 inside the fixed seat 23 during sewing. Combined with the thread-pulling mechanism 10 , the bottom thread driving motor 24 rotates in coordination with the fixed seat 23 and the machine head 11 under the control of the controller 50 , thereby realizing diversified sewing of stitches.

[0049] Figures 5 to 11 The feed dog assembly 25 comprises a feed dog 251, a support frame 255, a bracket 250, a feed dog connecting frame 254, an up and down lifting motor 252 and a front and rear feed motor 253. The front and rear feed motor 253 is fixed to the rear side of the fixed seat 23, and the output end of the front and rear feed motor 253 is sleeved on the driving end swing rod 25a of the feed dog connecting frame 254.

[0050] The feed dog assembly 25 of the present application has an upper and lower lifting motor 252 and a front and rear feed motor 253, and the feed dog's feeding action is realized by the upper and lower lifting motor 252 and the front and rear feed motor 253 outputting a swing source simultaneously and cooperatively. The above two swing driving sources implement a non-lateral transmission swing source to the feed dog 251 to realize the feed dog's feeding action, while the existing sewing machine feed action is realized by receiving a swing source from both sides of the feed dog, which is a significant feature of the swing source of the present application that is different from the prior art. The two swing driving sources of the present application indirectly act on the feed dog 251 to realize the feed action, wherein the lower lifting motor 252 indirectly acts on the feed dog connecting frame 254 and the feed dog 251, and the specific implementation of the feed dog assembly 25 has an upper and lower lifting motor 252, a front and rear feed motor 253, a support frame 255, a feed dog connecting frame 254, a bracket 250, a drive tooth lifting cam 1 256 and a tooth lifting cam 2 257, etc. The output shafts at both ends of the up and down lifting motor 252 are equipped with a driving tooth lifting cam 1 256 and a tooth lifting cam 2 257 .

[0051] The up-and-down lifting motor 252 is fixed on the bottom plate 211 of the fixed seat 21, and the up-and-down lifting motor 252 indirectly acts on the bottom 2551 of the support frame 255. The two ends of the up-and-down lifting motor 252 are equipped with a driving tooth lifting cam 1 256 and a tooth lifting cam 257 arranged on both sides of the fixed seat 21. The tooth lifting cam 1 256 and the tooth lifting cam 257 act on the two protrusions 28 on both sides of the bottom of the support frame 255 respectively. The front and rear sides of the support frame 255 are respectively provided with support rods 25c, and a bracket 250 is fixed on the bottom plate 211. The bracket 250 is located in front and rear of the up-and-down lifting motor 252. The groove 25d on the top of the bracket 250 is used to support the support rod 25c, and the groove 25d supports the entire support frame 255. The up and down lifting motor 252 controlled by the controller 60 makes a rotation motion, driving the tooth lifting cam 1 256 and the tooth lifting cam 2 257 to rotate. Since the tooth lifting cam 1 256 and the tooth lifting cam 2 257 have the structural characteristics of unequal diameters, the support frame 255 makes an up and down swinging motion to meet the feed dog 251, and is confined in the groove 25d, thereby driving the feed dog 251 to swing up and down.

[0052] A back-and-forth oscillator is installed on the output shaft of the front and rear feed motor 253 to realize the front-and-rear oscillation of the feed dog 251. The support frame 255 and the feed dog connecting frame 254 are in dynamic cooperation. The back-and-forth oscillator of this embodiment is specifically: fixed copper sleeves 259 are arranged at both ends of the upper part of the support frame 255, and the front and rear feed motors 253 are arranged on the side of the support frame 255. The feed dog 251 is connected and fixed to the upper part of the feed dog connecting frame 254, and the copper sleeve oscillating rod 25b and the driving end oscillating rod 25a at both ends of the feed dog connecting frame 254 are respectively arranged on the fixed copper sleeves 259 at both ends of the support frame 255, that is, the feed dog connecting frame 254 has a dynamic cooperation setting on the support frame 255. The feed dog connecting frame 254 is movably connected to the connecting rod 25f, and the connecting rod 25f is movably connected to the rotating disk 25e. The connecting rod 25f is movably connected to the eccentric position of the rotating disk 25e, and the rotating disk 25e is fixed on the output shaft of the front and rear feed motors 253. The front and rear feed motors 253 controlled by the controller 60 drive the rotating disk 25e and then drive the connecting rod 25f. The movable connecting rod 25f swings so that the feed dog connecting frame 254 swings forward and backward to meet the feeding requirements of the feed dog 251, thereby realizing the front and rear swing of the feed dog 251.

[0053] Under the control and drive of the controller 60, the front and rear feeding motors 253 and the up and down lifting motors 252 are transmitted to the feed dog 251 via the feed dog connecting frame 254, and are also confined in the groove 25d, forming a feed dog 251 in a feeding action state, thereby realizing the feeding action of the feed dog 251 of the sewing machine.

[0054] The fixing base 21 further comprises a needle plate 258 which is integrally connected to the fixing base 21 , and the feed dog 251 operates in the needle plate 258 .

[0055] The up-down swing source transmitted by the up-down lifting motor 252 controlled by the controller 60 and the front-back swing source transmitted by the front-back feeding motor 253 jointly indirectly act on the feed tooth 251, so as to realize the feeding action of the feed tooth 251 of the sewing machine. The up-down lifting motor 252 and the front-back feeding motor 253 controlled by the controller 60 realize programmed control in the adjustment of the sewing stitch length, which overcomes the traditional method of adjusting the stitch length of the original sewing machine. At the same time, the separation of the mechanical transmission mechanism of the sewing machine is realized, which overcomes the technical defects of the complex mechanical transmission mechanism of the existing sewing machine and the need for the assistance of the lubrication system to operate the mechanism, greatly reduces the difficulty of sewing machine manufacturing, and the sewing machine has epoch-making technical value.

[0056] Fig. 9 Fig.10 and Fig.11Shown is a schematic diagram of a multi-stage cam 1 91 and a multi-stage cam 2 92 of the feed dog assembly 25 of the present application. The multi-stage cam 1 91 and the multi-stage cam 2 92 have the same shape and size, except that the multi-stage cam 1 91 and the multi-stage cam 2 92 are installed at the two ends of the up-and-down lifting motor 252 at different positions and angles. The multi-stage cam 1 91 and the multi-stage cam 2 92 both have several high adjustment points 912 for determining the highest position of the feed dog 251, and several low adjustment points 913 for determining the lowest position of the feed dog 251, and the high adjustment points 912 are adjacent to the front and back of the high adjustment points 912. On the output shaft installed at the two ends of the up-and-down lifting motor 252, the high adjustment points 912 and the low adjustment points 913 of the multi-stage cam 1 91 and the multi-stage cam 2 92 are installed in a staggered manner at the two ends of the up-and-down lifting motor 252, that is, the high adjustment point 912 is not installed corresponding to the high adjustment point 912, and the high adjustment point 912 is installed corresponding to the low adjustment point 913.

[0057] exist Fig.10 In the embodiment, the adjustment high point 912 of the multi-stage cam 2 92 abuts against the protrusion 28, while the adjustment low point 913 of the multi-stage cam 1 91 abuts against the protrusion 28. At this time, the operating up and down lifting motor 252 transmits to the feed dog 251 a feeding action in a backward tilted state.

[0058] On the contrary, Fig.11 In the process, the adjustment low point 913 of the multi-stage cam 2 92 abuts against the protrusion 28, and the adjustment high point 912 of the multi-stage cam 1 91 abuts against the protrusion 28. At this time, the running up and down lifting motor 252 transmits to the feed dog 251 a feeding action in a forward tilted state.

[0059] exist Fig.14 Fig.15 In the figure, the rotary hook assembly 26 comprises a suspended rotary hook 261, a rotary hook fixing seat 265, an anti-skid cover plate 266, a thread rack 268, a rotary hook power source 262 and a hook needle 263. When the sewing machine is sewing, the rotary hook fixing seat 265 is fixed, a thread rack 268 is placed inside the rotary hook fixing seat 265, and an anti-skid cover plate 266 is arranged outside the thread rack 268, and the anti-skid cover plate 266 is used for the thread rack 268 to slide out. The rotary hook power source 262 drives the hook needle 263 to hook the sewing upper thread on the needle 152 and the sewing lower thread of the thread rack 268 in the suspended rotary hook 261 to form a knot. The hook needle 263 is fixedly connected to the hollow shaft 267 of the rotary hook power source 262, and the hollow shaft 267 of the rotary hook power source 262 is sleeved on the fixed rod 264 of the suspended rotary hook 261. The running track of the hook needle 263 is concentrically arranged with the fixed rod 264, and the fixed rod 264 is concentrically arranged with the thread rack 268. The suspended rotary hook 261 and the rotary hook fixing seat 265 have a sliding line gap and a positioning setting, and the suspended rotary hook 261 and the anti-slip cover plate 266 have a sliding line gap.

[0060] exist Fig.12 Fig.13 In the embodiment, the thread trimming assembly 27 comprises a rotary shuttle power source 262, a hollow rotating shaft 267, a push knife holder 270, a thread trimming power source 271, a thread trimming connecting rod 272, a second elastic member 273, a main knife 274, a main push knife connecting rod 275, a secondary push knife 276, a thread trimming bracket 277, a main push knife holder 278 and a secondary push knife connecting rod 279. When sewing is almost finished, when the rotary shuttle power source 262 runs the last circle, the controller 50 can start the thread trimming action, firstly start the thread trimming power source 271 to push the thread trimming connecting rod 272, and the pushing block 272a at the front end of the thread trimming connecting rod 272 reaches the notch 262c of the hollow rotating shaft 267, so that the running hollow rotating shaft 267 drives the thread trimming connecting rod 272 to rotate. The rotating thread trimming link 272 generates thrust on the secondary push knife link 279 and the main push knife link 275, thereby the main push knife holder 278 and the push knife holder 270. The above-mentioned main push knife holder 278 and the push knife holder 270 are connected to the main knife 274 and the push secondary knife 276 respectively, and the main knife 274 and the push secondary knife 276 are connected under the push of the main push knife holder 278 and the push knife holder 270 to complete the thread trimming action. The connecting rod end 272b of the above-mentioned thread trimming connecting rod 272 is hinged with the main push knife connecting rod 275, and the secondary push knife connecting rod 279 is hinged with the middle position of the thread trimming connecting rod 272. The middle position of the thread trimming connecting rod 272 also has a slide groove 272c, and the above-mentioned slide groove 272c matches the slide bar 262a set on the rotary hook power source 262 or the thread trimming power source bracket 27e. The elastic member 273 is also provided with the elastic member 273 on the thread trimming power source bracket 27e and the thread trimming connecting rod 272. After completing the thread trimming action, the thread trimming power source 271 immediately rebounds to the original position, and the thread trimming connecting rod 272, the main knife 274 and the secondary knife 276 also return to the original position.

[0061] In order to demonstrate the diversity of the special sewing functions of the sewing machine and to reflect that the sewing machine can achieve diversified stitch sewing, various sewing stitches are further explained below.

[0062] exist Fig.17 In the present application, the sewing machine has a pattern sewing function, and the swing angle of the feed dog 251 and the different back and forth angles are continuously adjusted, and the stitches formed are circular as a whole. The feed dog 251 continuously adjusts the stitches from point a1, makes a 90-degree turn when reaching point a2, rotates 180 degrees when reaching point a3, and rotates 270 degrees at point a4. The stitches from a1 to a4 are exactly a circle. Here, it is not limited to the feed dog 251 rotating every 90 degrees, and the implementation method is that the stitches form a complete circle.

[0063] exist Fig.18 In the invention, the sewing machine of the present invention has another function of pattern sewing, which is a corner stitch of multiple needles formed by intermittent angular swing.

[0064] exist Fig.19 In the present application, the sewing machine has the function of a flat-head buttonhole machine: b1 is the starting point, first the feed dog rotates 90 degrees to start sewing, the feed dog sews back and forth in the positive direction of the X-axis and at a fixed rotation angle to form one side of the buttonhole; when reaching point b2, the feed dog 251 rotates 90 degrees to start sewing again, the feed dog sews back and forth in the negative direction of the Y-axis and at a fixed rotation angle to reach point b3 on the other side of the buttonhole; at point b3, the feed dog sews back and forth in the negative direction of the X-axis and at a fixed rotation angle to complete the buttonhole on the other side and reach point b4, and at point b4, the Y-axis starts to sew in the positive direction at a fixed rotation angle to point b1 to complete sewing a buttonhole.

[0065] exist Fig. 20 The sewing machine of the present application has the function of a round head and flat head buttonhole machine. The sewing function of the present application is the same as the above-mentioned Fig.15 The function of the flat-head buttonhole machine is basically the same, except that a circular stitch of pattern sewing is made from the last point b3 to point b4.

[0066] exist Fig.21 The sewing machine of the present application has one of the zigzag sewing functions. The stitch length remains unchanged during the sewing process. The feed dog starts sewing at the first stitch, and the second stitch is sewn after rotating a certain angle with the same stitch length. The third stitch is rotated to an angle parallel to the first stitch with the same stitch length and continues sewing until all sewing is completed.

[0067] Fig. 22 The sewing machine of the present application has the second zigzag sewing function. The stitch length is automatically adjusted during the sewing process. The next stitch length is increased by a fixed value compared to the previous stitch length. The feed dog starts from a large angle and the next stitch is reduced by a fixed value compared to the previous stitch to sew back and forth, forming a zigzag seam.

[0068] In summary, the sewing function of the special stitch of the sewing machine of the present application is effective, can be applied to the sewing of different sewing products, and the special sewing function can also be applied to different sewing machines. It has high practicality and broad market prospects.

[0069] The above are only preferred implementations of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A sewing machine in which an upper thread mechanism and a lower thread mechanism rotate in coordination to perform sewing, comprising an upper thread mechanism (10), a lower thread mechanism (20) and a needle plate (258), characterized in that: The upper thread mechanism (10) and the lower thread mechanism (20) rotate in coordination with the needle (152) as the central axis to perform sewing; the lower thread mechanism (20) comprises a fixed seat (23) and a lower thread driving motor (24); the output shaft of the lower thread driving motor (24) passes through the bottom plate of the fixed bracket (61) and is connected to the fixed seat (23); the sewing machine comprises a controller (50); the controller (50) controls the lower thread driving motor (24); the lower thread driving motor (24) drives the fixed seat (23) and rotates together with the feed dog assembly (25), the rotary shuttle assembly (26) and the thread trimming assembly (27) inside the fixed seat (23) during sewing; the fixed seat (23) is connected to the needle plate (258); The rotary shuttle assembly (26) comprises a suspended rotary shuttle (261), a rotary shuttle power source (262), a hook needle (263), a fixing rod (264), a rotary shuttle fixing seat (265), an anti-skid cover plate (266), a hollow rotating shaft (267) and a thread rack (268); the rotary shuttle fixing seat (265) is fixed, a thread rack (268) is placed inside the rotary shuttle fixing seat (265), an anti-skid cover plate (266) is arranged outside the thread rack (268), and the rotary shuttle power source (264) is fixed to the rotary shuttle fixing seat (265). The hollow rotating shaft (267) of the hook needle (262) drives the hook needle (263) to hook the sewing upper thread on the needle (152) and the sewing lower thread on the thread rack (268) in the suspended rotary shuttle (261) to form a knot; the hook needle (263) is fixedly connected to the hollow rotating shaft (267), and the hollow rotating shaft (267) is sleeved on the fixed rod (264). The running track of the hook needle (263) is concentrically arranged with the fixed rod (264), and the fixed rod (264) and the thread rack (268) are concentrically arranged; The thread trimming assembly (27) comprises a thread trimming power source (271) and a thread trimming connecting rod (272). The thread trimming power source (271) pushes the thread trimming connecting rod (272) to reach the notch (262c) of the hollow rotating shaft (267). The rotary shuttle power source (262) drives the hollow rotating shaft (267) to rotate the thread trimming connecting rod (272). The rotating thread trimming connecting rod (272) pushes the main push knife holder (278) and the push knife holder (270). The main push knife holder (278) and the push knife holder (270) are respectively connected to the main knife (274) and the push secondary knife (276). The main push knife holder (278) and the push knife holder (270) push the main knife (274) and the push secondary knife (276) towards each other to complete the thread trimming action.

2. A sewing machine according to claim 1, wherein the upper thread mechanism and the lower thread mechanism rotate in coordination to sew, characterized in that: The upper thread mechanism (10) is fixedly mounted on the output shaft of the upper thread drive motor (12), and the upper thread drive motor (12) rotates around the machine needle (152) as the central axis. The lower thread mechanism (20) is mounted on the output shaft of the lower thread drive motor (24), and the lower thread drive motor (24) rotates around the machine needle (152) as the central axis.

3. A sewing machine according to claim 1, wherein the upper thread mechanism and the lower thread mechanism rotate in coordination to sew, characterized in that: The controller (50) also controls the upper thread driving motor (12); the upper thread mechanism (10) comprises a needle bar assembly (15), a presser foot lifting assembly (16) and a thread taking-up assembly (17); the upper thread driving motor (12) drives the needle bar assembly (15), the presser foot lifting assembly (16) and the thread taking-up assembly (17) to rotate together during sewing; the upper thread mechanism (10) is located at the long arm end (31) of the frame (30).

4. A sewing machine according to claim 3, wherein the upper thread mechanism and the lower thread mechanism rotate in coordination to sew, characterized in that: The needle bar assembly (15) has a power source (153), and the power source (153) drives the rotating disk (154) to rotate. A movable connecting rod (155) is connected to the eccentric position of the rotating disk (154), and the movable connecting rod (155) drives the needle crank (156), and the needle crank (156) drives the needle (152) to move up and down.

5. A sewing machine according to claim 3, wherein the upper thread mechanism and the lower thread mechanism rotate in coordination to sew, characterized in that: The presser foot lifting assembly (16) comprises a presser foot lifting power source (162), wherein the presser foot lifting power source (162) drives a presser foot cam (163) to rotate, and the presser foot cam (163) acts on a cam action plate (164) fixed on a presser foot rod (166), and an elastic member (165) is arranged between the cam action plate (164) and the head (11) of the sewing machine.

6. A sewing machine according to claim 3, wherein the upper thread mechanism and the lower thread mechanism rotate in coordination to sew, characterized in that: The wire take-up assembly (17) comprises a wire take-up drum (172) and a wire take-up post (174); the wire take-up drum (172) is provided with a wire take-up post (174); the wire take-up post (174) is provided with a wire drawing groove (177); the wire drawing groove (177) is sleeved with a sewing upper thread drawn from between a first thread clamp (175) and a second thread clamp (176).

7. A sewing machine according to claim 1, wherein the upper thread mechanism and the lower thread mechanism rotate in coordination to sew, characterized in that: The feed dog assembly (25) comprises a front and rear feed motor (253) and an up and down lifting motor (252); the front and rear feed motor (253) drives a turntable (25e) and then drives a connecting rod (25f); the up and down lifting motor (252) is fixed at the bottom of the fixing seat (23); the up and down lifting motor (252) drives the support frame (255) to perform an up and down swinging motion to satisfy the feed dog (251).

8. A sewing machine according to claim 7, wherein the upper thread mechanism and the lower thread mechanism rotate in coordination to sew, characterized in that: A tooth lifting cam 1 (256) and a tooth lifting cam 2 (257) are installed on the output shaft of the up and down lifting motor (252).

9. A sewing machine according to claim 7, wherein the upper thread mechanism and the lower thread mechanism rotate in coordination to sew, characterized in that: A multi-stage cam 1 (91) and a multi-stage cam 2 (92) are mounted on the output shaft of the up-and-down lifting motor (252).

10. A sewing machine according to claim 1, wherein the upper thread mechanism and the lower thread mechanism rotate in coordination to sew, characterized in that: The sewing machine also has an external presser foot mechanism (70), wherein the external presser foot mechanism (70) has an external presser foot (71), an external presser foot connecting rod (72), a fixing plate (73) and an external presser foot driving source (74); the external presser foot (71) is pressed around the presser foot (161); the external presser foot (71) is connected to the external presser foot connecting rod (72); the external presser foot connecting rod (72) is connected to the fixing plate (73); and the fixing plate (73) is connected to the output shaft of the external presser foot driving source (74).

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