Sewing machine and control method thereof

Abstract

The invention provides a sewing machine and a control method thereof.The sewing machine comprises a machine shell, a main shaft, a presser foot assembly, an upper thread tension adjusting mechanism, a presser foot pressure adjusting mechanism, a driving motor, a driving motor encoder and a control assembly, the main shaft is arranged in the machine shell, the presser foot assembly is in transmission connection with the main shaft, and the presser foot assembly is arranged in the machine shell in the mode that the presser foot assembly can move up and down; the driving motor is fixed on the machine shell through a motor mounting frame, the driving motor is simultaneously in transmission connection with the upper thread tension adjusting mechanism and the presser foot pressure adjusting mechanism, the upper thread tension adjusting mechanism is used for adjusting the upper thread tension, and the presser foot pressure adjusting mechanism is used for adjusting the presser foot pressure. The upper thread tension adjusting mechanism and the presser foot pressure adjusting mechanism are arranged to be assembly modules, the assembly modules are convenient to install and debug, modification is small compared with an original machine, universality is high, later internal workshop rapid assembly is facilitated, consumers can select and match functions according to requirements, and the technical flexibility is high.

Description

Technical Field

[0001] The invention relates to the technical field of presser foot pressure and surface thread tension regulating equipment in a sewing machine, in particular to a sewing machine and a control method thereof. Background Art

[0002] At present, the upper thread tension and presser foot pressure adjustment mechanism of traditional flat-bed sewing machines adjusts the upper thread tension and presser foot pressure by manually rotating the knob to compress the spring. For fabrics of different thicknesses, the knob must be repeatedly turned to change the compression amount of the spring for adjustment, which results in a lot of repetitiveness and useless labor, reducing production efficiency.

[0003] In actual production and use, the existing technology is generally used to adjust the presser foot pressure and the upper thread tension when the fabric changes greatly. It is difficult to meet the sewing requirements by adjusting either one alone. Generally, at least two drive sources are required to realize these two functions at the same time, and the overall cost is high. At the same time, the combination of the two functions is also relatively limited. It is difficult to adapt to machines with different thread trimming and presser foot lifting structures on different platforms, and it is difficult to reasonably select these two functional areas to meet the usage needs of different customers. In addition, the presser foot pressure in the existing technology needs to be kept at all times after the adjustment is completed, and the upper thread tension needs to be kept at all times after the adjustment is completed. The adjustment and maintenance of the above two pressures are achieved by independent drive sources, and the production cost is high. Summary of the invention

[0004] In view of the shortcomings of the prior art mentioned above, the object of the present invention is to provide a sewing machine and a control method thereof, which can realize automatic adjustment of the upper thread tension and the presser foot pressure by adding only one driving source, and the driving source is controlled by a control component with high precision, thereby solving the problems of high cost and large machine modifications caused by the need to use two independent driving sources to separately adjust the upper thread tension and the presser foot pressure in the prior art.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a sewing machine, including a casing, a main shaft, a presser foot assembly, a surface thread tension adjustment mechanism, a presser foot pressure adjustment mechanism, a driving motor, a driving motor encoder, and a control assembly, wherein the main shaft is arranged in the casing, the presser foot assembly is transmission-connected with the main shaft, and the presser foot assembly can be moved up and down in the casing; the driving motor is fixed to the casing through a motor mounting frame, and the driving motor is transmission-connected with the surface thread tension adjustment mechanism and the presser foot pressure adjustment mechanism at the same time, the surface thread tension adjustment mechanism is used to adjust the surface thread tension, and the presser foot pressure adjustment mechanism is used to adjust the presser foot pressure; the driving motor encoder is connected to the driving motor, and the control assembly is communication-connected with the driving motor encoder.

[0006] Preferably, the surface thread tension adjustment mechanism includes a surface thread tension driving cam, a surface thread tension transmission assembly, a pull rod, and a thread clamping assembly, wherein the surface thread tension driving cam is installed on the motor shaft of the driving motor; the surface thread tension driving cam is connected to the input end of the surface thread tension transmission assembly, the output end of the surface thread tension transmission assembly is connected to the pull rod, and the pull rod is connected to the thread clamping assembly; the surface thread tension transmission assembly includes a transmission lever, a support column, a reset torsion spring, a transmission slide rod, and a guide sleeve, one end of the support column is connected to the motor mounting frame, and the support The other end of the column is hinged to the transmission lever, and the return torsion spring is sleeved on the outer surface of the support column and connected to the transmission lever; an upper transmission bearing is arranged on the top of the transmission lever, and the surface line tension driving cam abuts against the upper transmission bearing; a lower transmission slide groove is opened at the bottom end of the transmission lever; a transmission slide rod connecting pin is connected to one end of the transmission slide rod, and the transmission slide rod connecting pin is clamped in the lower transmission slide groove; the guide sleeve is arranged in the casing, the transmission slide rod is inserted into the guide sleeve, and the end of the transmission slide rod away from the transmission slide rod connecting pin is connected to the pull rod.

[0007] Preferably, the wire clamping assembly includes a wire clamping adjustment seat, a wire clamping pin, a wire picking spring, a rear wire clamping plate, a front wire clamping plate, a pressure plate, a wire clamping spring, a pressure sleeve, and a push plate; the wire clamping adjustment seat is arranged in the casing, the wire clamping pin is inserted into the wire clamping adjustment seat, and the pull rod passes through the wire clamping pin; the wire picking spring is sleeved on the wire clamping pin, the rear wire clamping plate, the front wire clamping plate, the pressure plate, the wire clamping spring, and the pressure sleeve are all sleeved on the wire clamping pin, the pressure plate abuts against the front wire clamping plate, the wire clamping spring is arranged between the pressure plate and the pressure sleeve, a wire clamping pin slide groove is provided on the wire clamping pin, a pull rod convex cap is provided at the end of the pull rod away from the transmission slide rod, the push plate is fixed on the pressure sleeve, and the bottom end of the push plate is located in the wire clamping pin slide groove; when the pull rod slides in the wire clamping pin, the pull rod convex cap abuts against or separates from the bottom end of the push plate.

[0008] Preferably, the presser foot pressure regulating mechanism comprises a one-way transmission device, a presser foot pressure driving cam, a roller, a presser foot pressure driving crank, and a presser foot pressure transmission assembly, wherein the one-way transmission device is arranged on a motor mounting frame, and the presser foot pressure driving cam is sleeved on the one-way transmission device; the roller is arranged on the end of the presser foot pressure driving cam away from the motor mounting frame, the presser foot pressure driving crank is sleeved on the motor shaft of the driving motor, and the presser foot pressure driving crank can abut against or separate from the roller; the outer peripheral surface of the presser foot pressure driving cam is connected to the presser foot assembly through the presser foot pressure transmission assembly;

[0009] The one-way transmission device includes a bearing mounting seat and a one-way bearing. The bearing mounting seat is fastened to the motor mounting frame, the inner ring of the one-way bearing is sleeved on the bearing mounting seat, and the inner wall of the presser foot pressure driving cam is sleeved on the outer ring of the one-way bearing.

[0010] The cam is connected to the upper and lower ends of the cams, and the cams are connected with the adjusting cam at the other end to the upper and lower ends of the cams.

[0011] Preferably, a top cap is also provided on the upper side of the upper sleeve, and a pressure-adjusting bolt is provided in the top cap, and the bottom end of the pressure-adjusting bolt can abut against or separate from the top end of the upper slide rod; the one-way transmission device can be replaced by a pawl or ratchet mating part.

[0012] Preferably, the sewing machine also includes a function operation switch, a spindle motor, a spindle encoder, a thread trimming mechanism, a displacement sensor, and a presser foot lifting mechanism, wherein the function operation switch is used to realize the function of the sewing machine; the spindle motor is connected to the spindle encoder, and the spindle motor is connected to the spindle transmission to drive the rotation of the spindle; the thread trimming mechanism is used to cut the surface thread of the sewing material; the displacement sensor is arranged on the presser foot assembly to detect the thickness of the sewing material; the presser foot lifting mechanism is used to realize the lifting and lowering of the presser foot assembly; the function operation switch, spindle encoder, thread trimming mechanism, displacement sensor, and presser foot lifting mechanism are all communicatively connected to the control assembly.

[0013] Preferably, the control component includes an operation panel, a central processing unit, an electronic controller, and a storage unit, wherein the operation panel is used to input set parameters; the central processing unit is used to process the input information and output the information; the electronic controller is used to receive information from the central processing unit and execute it; the storage unit is used to store information, and the storage unit includes corresponding parameter values ​​of the angle of the drive motor and the presser foot pressure and the surface thread tension.

[0014] To achieve the above purpose or other purposes, the present invention also discloses a control method for a sewing machine, using the above sewing machine, the sewing machine includes a control component, the control component includes an operation panel, a central processing unit, an electronic controller, and a storage unit; the steps are as follows:

[0015] S1: The operator inputs sewing parameters into the control component through the operation panel according to the specifications and materials of the sewing materials;

[0016] S2: The control component receives the input sewing parameters, the central processor processes and analyzes the input sewing parameter information and sends it to the electronic controller, and the electronic controller controls the drive motor to rotate a corresponding angle;

[0017] S3: The driving motor works, and the motor shaft of the driving motor drives the surface thread tension adjusting mechanism to work to adjust the surface thread tension, and the motor shaft of the driving motor drives the presser foot pressure adjusting mechanism to work to adjust the presser foot pressure.

[0018] Preferably, the storage unit includes corresponding parameters of the driving motor angle, presser foot pressure and surface thread tension; in step S2, the central processing unit processes and analyzes the input sewing parameters, that is, the central processing unit determines the rotation angle of the driving motor based on the sewing parameter information.

[0019] As described above, the sewing machine and the control method thereof according to the present invention have the following beneficial effects:

[0020] 1. In the present invention, a driving motor is used to drive the presser foot pressure adjustment mechanism and the upper thread tension adjustment mechanism, so that the sewing machine can automatically adjust the presser foot pressure and the upper thread tension, which has low cost and more reasonable function combination.

[0021] 2. The present invention is provided with a control component, which contains corresponding parameters of the angle of the driving motor and the pressure of the presser foot and the tension of the upper thread; when the specifications of the sewing material change, the operator can directly input the specifications of the sewing material, and the control component can automatically match the presser foot pressure and the tension of the upper thread corresponding to the specifications of the sewing material, and then automatically correspond to the rotation angle of the driving motor, and realize the driving motor rotating to the corresponding angle through the electronic controller, thereby completing the adjustment of the pressure of the presser foot and the tension of the upper thread.

[0022] 3. The present invention is provided with a one-way bearing or a one-way structure similar to a one-way bearing, which can realize the functions of adjusting the presser foot pressure and adjusting the surface thread tension without affecting each other. It can not only maintain the torque required for the presser foot pressure and the surface thread tension at all times, but also adjust the size of the presser foot pressure and the surface thread tension at any time.

[0023] 4. The present invention is provided with a one-way bearing or a one-way structure similar to a one-way bearing. The reaction force generated in the presser foot is maintained by the one-way structure. There is no need for the drive motor to maintain the torque at all times. The drive motor only needs to maintain the reaction force generated by a smaller surface thread tension. This can reduce the heat generation of the drive motor and increase the service life of the drive motor.

[0024] 5. The surface thread tension adjustment mechanism and the presser foot pressure adjustment mechanism in the present invention are configured as component modules, which are mounted on the casing and are easy to install and debug. The modification is relatively minor compared to the original machine, and the module has strong versatility, is convenient for rapid assembly in the later internal workshop, and consumers can select functions according to their needs, and has high technical flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a spatial schematic diagram of a sewing machine of the present invention;

[0026] Figure 2 It is a spatial schematic diagram of the presser foot pressure adjustment mechanism and the upper thread tension adjustment mechanism in the present invention;

[0027] Figure 3 is a cross-sectional view of the upper thread tension adjustment mechanism of the present invention;

[0028] Figure 4 An exploded view of the drive motor and related components in the present invention;

[0029] Figure 5 A working principle diagram of the sewing machine control method according to the present invention;

[0030] Figure 6 It is an adaptive control diagram of a driving motor in the sewing machine control according to the present invention;

[0031] Figure 7 It is a schematic diagram of the rotation angle range of the upper thread tension driving cam in the present invention;

[0032] Figure 8 Schematic diagram of the rotation angle range of the presser foot pressure driving cam in the present invention;

[0033] Fig. 9 It is a schematic diagram of the rotation angle range of the driving motor in the present invention;

[0034] Fig.10 It is a schematic diagram of the control timing of the driving motor and the pressure change curve of the presser foot and the tension change curve of the upper thread in the present invention;

[0035] Fig.11 It is a schematic diagram of the connection of the control components of the sewing machine in the present invention.

[0036] Description of reference numerals:

[0037] 1. Driving motor; 2. Motor bracket; 201. First side plate; 202. Bottom plate; 203. Second side plate; 3. Upper thread tension driving cam; 4. Reset torsion spring; 5. Support column; 6. Presser foot assembly; 7. Presser foot rod; 8. Pressure regulating guide rod; 9. Pressure regulating spring; 10. Slider; 11. Slider seat; 12. Upper slide rod; 13. Upper shaft sleeve; 14. Top cap; 15. Adjusting connecting rod; 16. Retaining ring; 17. Driving shaft; 18. Swing crank; 19. Roller; 20. Motor fixing plate; 21. Upper transmission bearing; 22. Transmission lever; 2201. Lower transmission slide; 23. Transmission slide connecting pin; 24. Transmission slide; 25. Guide sleeve; 26. Oil-proof sleeve; 27. Pull rod; 28. Thread clamping pin; 29. ​​Thread clamping adjustment seat; 30. Pressing plate; 31. Pressing sleeve; 32. Push plate; 33. Protective cap; 34. Thread clamping spring; 35. Front thread clamping plate; 36. Rear thread clamping plate; 37. Thread picking spring; 38. Presser foot pressure drive cam; 39. Roller; 40. Second side plate bearing; 41. Presser foot pressure drive crank; 42. One-way bearing; 43. Bearing mounting seat; 44. Casing. DETAILED DESCRIPTION

[0038] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0039] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0040] The present invention provides a sewing machine. For the convenience of description, the length direction of the sewing machine is defined as the left-right direction, the width direction of the sewing machine is defined as the front-back direction, and the height direction of the sewing machine is defined as the up-down direction. Figure 3 As shown, the left direction and the right direction of the paper are the rear direction and the front direction respectively, the upper direction and the lower direction of the paper are the upper direction and the lower direction respectively, and the front and the back of the paper are the right direction and the left direction respectively.

[0041] like Figure 1-Figure 4As shown, the present invention provides a sewing machine, including a casing 44, a main shaft, a presser foot assembly 6, a surface thread tension adjustment mechanism, a presser foot pressure adjustment mechanism, a driving motor 1, a driving motor encoder, and a control component. The main shaft is arranged in the casing 44 along the left and right directions, and the presser foot assembly 6 is transmission-connected with the main shaft and can be moved up and down in the casing 44; the driving motor 1 is fixed to the rear side wall of the casing 44 through a motor mounting frame, and the driving motor 1 is transmission-connected with the surface thread tension adjustment mechanism and the presser foot pressure adjustment mechanism at the same time, the surface thread tension adjustment mechanism is used to adjust the surface thread tension, and the presser foot pressure adjustment mechanism is used to adjust the presser foot pressure; the driving motor encoder is connected to the driving motor 1, and the control component is communication-connected with the driving motor encoder.

[0042] The sewing machine of the present invention is provided with a control component, a driving motor 1, and a driving motor encoder. The control component controls the rotation angle of the driving motor 1 through the driving motor encoder, and the control component stores the rotation angles of the driving motor 1 corresponding to the upper thread tension and the presser foot pressure. After the operator places the sewing material on the sewing machine, the specification parameters of the sewing material are input into the control component, and the control component analyzes and processes the input specification parameters, and then automatically matches the presser foot pressure and upper thread tension required for the sewing material of the specification, and then controls the driving motor 1 to rotate to the corresponding angle according to the presser foot pressure and the upper thread tension, thereby realizing accurate control of the presser foot pressure and the upper thread tension.

[0043] Further, such as Figure 1 , Figure 2 , Figure 4 As shown, in this embodiment, the motor mounting frame includes a motor fixing plate 20 and a motor bracket 2. The motor fixing plate 20 is arranged on the rear side wall of the housing 44. The motor bracket 2 is fastened to the right end face of the motor fixing plate 20 by screws in the front-back direction. The motor bracket 2 is a U-shaped member, including a first side plate 201, a second side plate 203, and a bottom plate 202. The first side plate 201 and the second side plate 203 are fixedly connected through the bottom plate 202. The first side plate 201 and the second side plate 203 are both provided with through holes. The motor shaft of the driving motor 1 passes through the through hole of the first side plate 201 and the through hole of the second side plate 203 at the same time. The upper thread tension adjustment mechanism and the presser foot pressure adjustment mechanism are both connected to the motor shaft of the driving motor 1 by transmission. Further, a second side plate bearing 40 is arranged in the through hole of the second side plate 203, which is used to support the motor shaft of the driving motor 1 to rotate in the through hole of the second side plate 203. The driving motor 1 is fixed on the rear end face of the first side plate 201.

[0044] Preferably, Figure 2-Figure 4As shown, the surface thread tension adjustment mechanism includes a surface thread tension driving cam 3, a surface thread tension transmission assembly, a pull rod 27, and a clamping assembly. The surface thread tension driving cam 3 is installed on the motor shaft of the driving motor 1; the surface thread tension driving cam 3 is connected to the input end of the surface thread tension transmission assembly, the output end of the surface thread tension transmission assembly is connected to the pull rod 27, and the pull rod 27 is connected to the clamping assembly; the surface thread tension transmission assembly includes a transmission lever 22, a support column 5, a reset torsion spring 4, a transmission slide rod 24, and a guide sleeve 25. The left end of the support column 5 is connected to the motor bracket 2, and the right end of the support column 5 is hinged to the transmission lever 2 through an axial screw. 2, the return torsion spring 4 is sleeved on the outer surface of the support column 5 and connected to the transmission lever 22; the top of the transmission lever 22 is provided with an upper transmission bearing 21, and the surface thread tension driving cam 3 is in contact with the upper transmission bearing 21; the bottom of the transmission lever 22 is provided with a lower transmission slide 2201; the rear end of the transmission slide 24 is connected with a transmission slide connecting pin 23, and the transmission slide connecting pin 23 is clamped in the lower transmission slide 2201; the guide sleeve 25 is provided in the housing 44, the transmission slide 24 is inserted in the guide sleeve 25 along the front and rear direction, and the front end of the transmission slide 24 is connected to the rear end of the pull rod 27 by threading. In this embodiment, the upper transmission bearing 21 and the surface thread tension driving cam 3 form a cam pair. In this embodiment, the rear end of the transmission slide 24 is provided with a transmission slide radial pin hole, and the transmission slide connecting pin 23 is inserted in the transmission slide radial pin hole and limited by the retaining spring. The transmission slide bar connecting pin 23 forms a sliding pair with the lower transmission slide groove 2201. Further, the front end of the guide sleeve 25 is also provided with an oil-proof sleeve 26, and the transmission slide bar 24 passes through the oil-proof sleeve 26, which plays an oil-proof role in preventing the oil inside the housing 44 from leaking outwards.

[0045] Preferably, Figure 3 As shown, the clamp assembly includes a clamp adjustment seat 29, a clamp pin 28, a thread take-up spring 37, a rear clamp plate 36, a front clamp plate 35, a pressure plate 30, a clamp spring 34, a pressure sleeve 31, and a push plate 32. The clamp adjustment seat 29 is arranged in the housing 44 along the front-to-back direction, the clamp pin 28 is inserted in the clamp adjustment seat 29 along the front-to-back direction, and the pull rod 27 passes through the clamp pin 28; the thread take-up spring 37 is sleeved on the clamp pin 28, the rear clamp plate 36, the front clamp plate 35, the pressure plate 30, the clamp spring 34, the pressure sleeve 31, and the push plate 32. The spring 34 and the pressing sleeve 31 are both sleeved on the clamping pin 28, the pressing plate 30 is in contact with the front clamping plate 35, the clamping spring 34 is arranged between the pressing plate 30 and the pressing sleeve 31, the clamping pin 28 is provided with a clamping pin slide groove, the front end of the pull rod 27 is provided with a pull rod convex cap, the push plate 32 is fastened to the pressing sleeve 31 by screws, and the bottom end of the push plate 32 is located in the clamping pin slide groove; when the pull rod 27 slides in the clamping pin 28 in the front and rear directions, the pull rod convex cap abuts or separates from the bottom end of the push plate 32. In this embodiment, the surface thread is wound on the thread taking-up spring 37, and the thread taking-up spring 37 is used to assist in completing the thread taking-up movement. There are two push plates 32.

[0046] Further, such as Figure 3 As shown, a protective cap 33 is also provided on the outer periphery of the front end of the clamping pin 28, and the protective cap 33 plays a protective role.

[0047] In this embodiment, if Figure 2 , Figure 3 As shown, when the driving motor 1 rotates, the needle thread tension driving cam 3 rotates and abuts against the upper transmission bearing 21, the transmission lever 22 rotates around the support column 5, and the transmission slide rod connecting pin 23 moves forward and backward in the lower transmission slide groove 2201, and then the transmission slide rod 24 drives the pull rod 27 to move forward and backward. When the pull rod 27 moves backward, the pull rod convex cap will apply a force to the push plate 32, and the push plate 32 will transmit the force to the front clamping plate 35 through the pressing sleeve 31, the clamping spring 34, and the pressing plate 30, and then the front clamping plate 35 will move toward the rear clamping plate 36, thereby changing the friction force of the needle thread between the front clamping plate 35 and the rear clamping plate 36, and realizing the adjustment of the needle thread tension. When the pull rod 27 moves forward, the rotation direction of the driving motor 1 is opposite to the direction of the pull rod 27 moving backward.

[0048] Preferably, Figure 2 , Figure 4 As shown, the presser foot pressure regulating mechanism includes a one-way transmission device, a presser foot pressure driving cam 38, a roller 39, a presser foot pressure driving crank 41, and a presser foot pressure transmission assembly. The one-way transmission device is arranged on the motor mounting frame, and the presser foot pressure driving cam 38 is sleeved on the one-way transmission device; the roller 39 is arranged on the right end of the presser foot pressure driving cam 38, the presser foot pressure driving crank 41 is sleeved on the motor shaft of the driving motor 1, and the presser foot pressure driving crank 41 can be abutted or separated from the roller 39; the outer peripheral surface of the presser foot pressure driving cam 38 is connected to the presser foot assembly 6 through the presser foot pressure transmission assembly. The one-way transmission device includes a bearing mounting seat 43 and a one-way bearing 42, the bearing mounting seat 43 is fastened to the first side plate 201, the inner ring of the one-way bearing 42 is sleeved on the bearing mounting seat 43, and the inner wall of the presser foot pressure driving cam 38 is sleeved on the outer ring of the one-way bearing 42. In this embodiment, when the driving motor 1 rotates forward (counterclockwise), the one-way bearing 42 is in a free state and can rotate; when the driving motor 1 rotates reversely (clockwise), the one-way bearing 42 is locked.

[0049] Preferably, Figure 2As shown, the presser foot pressure transmission assembly includes a swing crank 18, a roller 19, a drive shaft 17, an adjusting connecting rod 15, a slider seat 11, a slider 10, an upper slide rod 12, a pressure regulating spring 9, a pressure regulating guide rod 8, a presser foot rod 7, and an upper sleeve 13. The drive shaft 17 is rotatably arranged in the housing 44, the rear end of the drive shaft 17 is connected to the swing crank 18, and the front end is connected to the adjusting connecting rod 15. The roller 19 is arranged on the swing crank 18, and the roller 19 is in contact with or separated from the outer peripheral surface of the presser foot pressure driving cam 38; the adjusting connecting rod 38 is provided ... provided on the swing crank 18, and the roller 19 is provided on the swing crank 18, and the roller 19 is provided on the outer peripheral surface of the presser foot pressure driving cam 38. The right end of the rod 15 is provided with a slider 10 through a fixing pin along the front-back direction. The slider 10 is clamped in a slider seat 11. The slider seat 11 is fixed on the outer peripheral surface of the upper slider 12. The upper slider 12 is slidably arranged in an upper sleeve 13, and the upper sleeve 13 is fixed in the housing 44. A blind hole is opened in the axial direction in the upper slider 12. The pressure regulating guide rod 8 is arranged in the blind hole. The pressure regulating spring 9 is sleeved on the outer periphery of the pressure regulating guide rod 8. The top of the presser foot rod 7 is connected to the bottom of the pressure regulating spring 9, and the presser foot assembly 6 is arranged at the bottom of the presser foot rod 7. In this embodiment, the roller 19 and the presser foot pressure driving cam 38 form a space cam pair. The slider 10 and the slider seat 11 form a slider pair. The pressure regulating guide rod 8 is a telescopic guide for the pressure regulating spring 9.

[0050] Preferably, Figure 2 As shown, the outer periphery of the drive shaft 17 is provided with a drive shaft sleeve (not shown in the figure), the drive shaft sleeve is arranged in the housing 44 along the front-back direction, and the drive shaft 17 can rotatably penetrate the drive shaft sleeve; a retaining ring 16 is also provided at the connection between the drive shaft 17 and the adjusting connecting rod 15, and the retaining ring 16 is used to axially limit the adjusting connecting rod 15. Further, in this embodiment, a top cap 14 is also provided on the upper side of the upper sleeve 13, and a pressure regulating bolt is provided in the top cap 14, and the bottom end of the pressure regulating bolt can be abutted or separated from the top end of the upper slide bar 12; when the presser foot pressure regulating mechanism fails, the height of the upper slide bar 12 can be controlled by the pressure regulating bolt, thereby adjusting the size of the presser foot pressure.

[0051] Furthermore, in other embodiments, the one-way transmission device can be replaced by a pawl and a ratchet mating part. The ratchet is fixed on the motor shaft, and the pawl is fixed on the second side plate 203. The presser foot pressure driving cam 38 is arranged on one end face of the ratchet, and the roller 39 is arranged on the other end face of the ratchet. When the driving motor 1 rotates forward, the pawl will not be stuck on the ratchet, the presser foot pressure driving crank 41 abuts against the roller 39, and the presser foot pressure driving cam 38 can rotate with the ratchet; when the driving motor 1 rotates reversely, the pawl will jam the ratchet, and even if the presser foot pressure driving crank 41 abuts against the roller 39, the presser foot pressure driving cam 38 will not rotate.

[0052] Preferably, Fig.11As shown, the sewing machine also includes a function operation switch, a spindle motor, a spindle encoder, a thread trimming mechanism, a displacement sensor, and a presser foot lifting mechanism. The function operation switch is used to realize the function of the sewing machine; the spindle motor is connected to the spindle encoder, and the spindle motor is connected to the spindle transmission to drive the rotation of the spindle; the thread trimming mechanism is used to cut the surface thread of the sewing material; the displacement sensor is set on the presser foot assembly 6 to detect the thickness of the sewing material; the presser foot lifting mechanism is used to realize the lifting and lowering of the presser foot assembly 6; the function operation switch, the spindle encoder, the thread trimming mechanism, the displacement sensor, and the presser foot lifting mechanism are all connected to the control assembly in communication. Further, it also includes a foot pedal to facilitate the operator to adjust the sewing machine.

[0053] Preferably, the control component includes an operation panel, a central processing unit, an electronic controller, and a storage unit. The operation panel is used to input set parameters; the central processing unit is used to process the input information and output the information; the electronic controller is used to receive the information of the central processing unit and execute it; the storage unit is used to store information, including the corresponding parameter values ​​of the angle of the drive motor 1 and the pressure of the presser foot and the tension of the upper thread. Further, the storage unit includes ROM, RAM, and an external memory.

[0054] To achieve the above purposes or other purposes, such as Figure 5-Figure 10 As shown, the present invention also discloses a control method for a sewing machine, using the above sewing machine, the steps are as follows:

[0055] A1: The operator inputs sewing parameters into the control component through the operation panel according to the specifications and materials of the sewing materials;

[0056] A2: If Figure 5 , Figure 6 As shown, the central processor in the control component receives the input sewing parameters, processes and analyzes the input sewing parameters and sends them to the electronic controller, which controls the drive motor 1 to rotate to a corresponding angle; the storage unit stores the corresponding parameters of the angle of the drive motor 1 and the size of the presser foot pressure and the size of the upper thread tension. The process of the central processor processing and analyzing the input sewing parameters is the process of the central processor determining the rotation angle of the drive motor 1 according to the sewing parameter information.

[0057] A3: The driving motor 1 works, and the motor shaft of the driving motor 1 drives the surface thread tension adjustment mechanism to work to adjust the surface thread tension, and the motor shaft of the driving motor 1 drives the presser foot pressure adjustment mechanism to work to adjust the presser foot pressure.

[0058] A3.1: If Figure 2 , Figure 5As shown, in step A2, when the central processing unit determines that the presser foot pressure of the sewing material needs to be adjusted according to the sewing parameters, the central processing unit sends the rotation angle of the drive motor 1 to the drive motor 1 through the electronic controller, and the drive motor 1 rotates forward (counterclockwise), and the motor shaft of the drive motor 1 drives the presser foot pressure driving crank 41 to rotate, and the presser foot pressure driving crank 41 rotates to abut against the roller 39 on the right end face of the presser foot pressure driving cam 38, thereby driving the presser foot pressure driving cam 38 to rotate on the outer ring of the one-way bearing 42. When the presser foot pressure driving cam 38 rotates counterclockwise, the outer peripheral surface of the presser foot pressure driving cam 38 abuts against the roller 19, and the roller 19 rotates clockwise. At the same time, the left end of the swing crank 18 moves upward, and the right end of the swing crank 18 rotates downward. The rotation of the swing crank 18 drives the drive shaft 17 to rotate, and then the adjusting connecting rod 15 rotates downward with the drive shaft 17, and then drives the upper slide bar 12 to move downward through the slider 10 and the slider seat 11. The pressure regulating spring 9 in the upper slide bar 12 is compressed, and the presser foot rod 7 at the bottom of the pressure regulating spring 9 is pressed downward, so that the presser foot pressure is adjusted. When the presser foot pressure is adjusted, the drive motor 1 reverses and resets. At this time, the presser foot pressure driving crank 41 and the roller 39 gradually separate, and the reaction force of the compressed pressure regulating spring 9 is transmitted to the outer peripheral surface of the presser foot pressure driving cam 38 through the slider 10, the slider seat 11, the adjusting connecting rod 15, the driving shaft 17, the swing crank 18, and the roller 19 in sequence, which will force the presser foot pressure driving cam 38 to rotate clockwise. However, since the presser foot pressure driving cam 38 is located on the outer ring of the one-way bearing 42, when the presser foot pressure driving cam 38 rotates clockwise, the one-way bearing 42 is locked, so the upward reaction force of the pressure regulating spring 9 is locked by the one-way bearing 42, so that the presser foot pressure can be continuously guaranteed. Figure 8 As shown, the protruding portion of the presser foot pressure driving cam 38 is a presser foot pressure regulating section, which is used to abut against the roller 19; the recessed portion of the presser foot pressure driving cam 38 is a one-way transition section.

[0059] A3.2: If Figure 3 , Figure 5As shown, in step A2, when the central processor determines that the sewing material needs to adjust the surface thread tension according to the sewing parameters, the central processor sends the rotation angle of the drive motor 1 to the drive motor 1 through the electronic controller, and the drive motor 1 reverses (rotates clockwise), and the surface thread tension drives the cam 3 to rotate clockwise and gradually abuts against the upper transmission bearing 21, and the upper transmission bearing 21 drives the transmission lever 22 to rotate around the support column 5, and the reset torsion spring 4 is subjected to torsion; the upper transmission bearing 21 swings forward, and the lower transmission slot 2201 at the bottom of the transmission lever 22 deflects backward, and the transmission slide rod connecting pin 23 in the lower transmission slot 2201 follows the lower transmission slot 2201 to move backward, and then the transmission slide rod 24 moves backward in the guide sleeve 25. The pull rod 27 connected to the transmission slide rod 24 moves backward in the wire clamping pin 28. The backward movement of the pull rod 27 drives the push plate 32 and the pressure sleeve 31 to move backward, and then the wire clamping spring 34 is compressed. The wire clamping spring 34 pushes the pressure plate 30 and the front wire clamping plate 35 to move toward the rear wire clamping plate 36, thereby changing the friction between the front wire clamping plate 35 and the rear wire clamping plate 36, thereby changing the surface line tension between the front wire clamping plate 35 and the rear wire clamping plate 36. When the surface line tension driving cam 3 continues to rotate and gradually separates from the upper transmission bearing 21, the reset torsion spring 4 and the elastic force in the wire clamping spring 34 are released, thereby resetting the pull rod 27 and the transmission lever 22. Therefore, after the surface line tension adjustment is completed, the drive motor 1 cannot be reset, and the torque needs to be continuously maintained to ensure the surface line tension. Figure 7 As shown, the needle thread tension driving cam 3 shown in the needle thread tension adjustment section abuts against the upper transmission bearing 21 to adjust the needle thread tension.

[0060] A3.3: If Figure 7 As shown, in step A3.2, when the surface thread tension is the smallest, that is, when the base circle segment of the surface thread tension driving cam 3 abuts against the roller 19, the surface thread is in the loosest stage, and this interval of the base circle segment of the surface thread tension driving cam 3 is the thread trimming and loosening action interval. The drive motor 1 controls the surface thread tension driving cam 3 to rotate into this interval, and then the central processing unit starts the thread trimming mechanism or the presser foot lifting mechanism through the electronic controller to perform automatic thread trimming or presser foot lifting action. After the thread trimming is completed or the presser foot lifting is completed, the drive motor 1 is reset. Further, Figure 7 The mark of the middle loose thread section is only a part of the base circle section of the upper thread tension driving cam 3. Accordingly, when the sewing machine needs to trim the thread or lift the presser foot, the central processing unit will control the driving motor 1 to rotate to the base circle section of the upper thread tension driving cam 3, in which the upper thread tension is close to 0.

[0061] Furthermore, when the presser foot pressure is adjusted in step A3.1, and the thread trimming or presser foot lifting operations are performed in step A3.3, the drive motor 1 will rotate, and will drive the surface thread tension driving cam 3 to change within the extreme value range of Table 3. After adjusting the presser foot pressure or performing the thread trimming or presser foot lifting operations, the drive motor 1 will return to the position angle corresponding to the surface thread tension value set by the sewing machine system, thereby maintaining the surface thread tension value.

[0062] Preferably, in the process of adjusting the presser foot pressure in step A3.1, the roller 39 on the right end face of the presser foot pressure driving cam 38 abuts, and when the protrusion of the presser foot pressure driving cam 38 is close to the roller 39, the presser foot pressure increases, and when the protrusion of the presser foot pressure driving cam 38 is away from the roller 39, the presser foot pressure decreases. However, since the presser foot pressure driving cam 38 is arranged on the outer periphery of the one-way bearing 42, the presser foot pressure driving cam 38 can only rotate in one direction (forward); therefore, when the presser foot pressure needs to increase, the electronic control controller starts the drive motor 1 to rotate from the initial position according to the angle data in Table 1; when the presser foot pressure needs to decrease, the electronic control controller starts the drive motor 1 to rotate from the initial position according to the angle data in Table 2. Tables 1 and 2 are as follows:

[0063]

[0064] In Table 1, A represents the code for the angle of rotation of the drive motor 1 relative to the zero position angle of the drive motor 1 when the presser foot pressure value is G; G1 is the minimum value of the presser foot pressure, and Gn is the maximum value of the presser foot pressure. The values ​​between the two correspond to the angle range for the drive motor 1 to adjust the presser foot pressure; G1-Gn are arranged in ascending order with equal scales, and a is the angle value of the drive motor 1 corresponding to the evenly divided scale.

[0065]

[0066] In Table 2, B represents the code for the angle of rotation of the drive motor 1 relative to the zero position angle of the drive motor 1 when the presser foot pressure value is G; G1 is the minimum value of the presser foot pressure, and Gn is the maximum value of the presser foot pressure. The values ​​between the two correspond to the angle range for the drive motor 1 to adjust the presser foot pressure; G1-Gn are arranged in ascending order with equal scales, and b is the angle value of the drive motor 1 corresponding to the evenly divided scale.

[0067] When the driving motor 1 rotates according to the angle in Table 1, the presser foot pressure G gradually increases; however, when the presser foot pressure needs to be reduced, due to the one-way bearing 42, the presser foot pressure driving cam 38 can only rotate in one direction, that is, the driving motor 1 can only rotate one circle in the same direction to the specified angle value, so when the presser foot pressure decreases, it needs to increase by 360° before decreasing.

[0068] Preferably, in step A3.2, during the process of adjusting the tension of the needle thread, the needle thread tension adjustment mechanism does not have a one-way structure, so the drive motor 1 can rotate forward and reverse in the adjustment range of the needle thread tension, and the angle data of the needle thread tension adjustment is rotated according to Table 3. Table 3 is as follows:

[0069]

[0070] In Table 3, C represents the thread tension value N, the code for the angle of rotation of the drive motor 1 relative to the zero position angle of the drive motor 1; N1 is the minimum value of the presser foot pressure, Nn is the maximum value of the presser foot pressure, and the values ​​between the two correspond to the angle range of the drive motor 1 adjusting the presser foot pressure; N1-Nn are arranged in ascending order with equal scales, and c is the angle value of the drive motor 1 corresponding to the evenly divided scale. When the drive motor 1 rotates in the angle range in Table 3, the thread tension value will also increase or decrease accordingly.

[0071] Further, such as Fig. 9 , Fig.10 As shown, in this embodiment, when the driving motor 1 rotates 180 degrees in the forward direction, the pressure of the presser foot gradually increases (the protrusion of the presser foot pressure driving cam 38 is close to the roller 39), and the surface thread tension remains stable (the base circle of the surface thread tension driving cam 3 is close to the roller 19). When the driving motor 1 rotates 360 degrees in the forward direction (between 180°-360°), the pressure of the presser foot gradually decreases (the protrusion of the presser foot pressure driving cam 38 is away from the roller 39), and the surface thread tension increases (the protrusion of the surface thread tension driving cam 3 is close to the roller 19). When the driving motor 1 rotates in the reverse direction, the pressure of the presser foot remains unchanged (the uniqueness of the one-way bearing 42); when the driving motor 1 rotates in the reverse direction to -75°, the surface thread tension also increases (the protrusion of the surface thread tension driving cam 3 is close to the roller 19). Therefore, the surface thread tension can be adjusted in the forward or reverse direction in this interval.

[0072] Preferably, the sewing parameters input by the operator in A1 include the thickness of the sewing material, the size of the stitch length, etc. In this embodiment, Figure 6 As shown, the presser foot assembly 6 is also provided with a displacement sensor, which is used to detect the thickness of the sewing material. The displacement sensor sends the detected thickness parameters to the central processing unit, and the central processing unit calls the corresponding presser foot pressure and upper thread tension parameters, thereby realizing the intelligence of the sewing machine. Different presser foot pressure values ​​and upper thread tension values ​​corresponding to different fabric thicknesses can be pre-set and stored, and can also be customized and edited.

[0073] The sewing machine and control method thereof according to the present invention have the following beneficial effects:

[0074] 1. The present invention is provided with a control component, in which the surface thread tension parameters and presser foot pressure parameters corresponding to different fabric specifications are stored. The control component can automatically match the rotation angle of the drive motor 1 according to the input parameters of the operator or the detection parameters of the displacement sensor, and the degree of automation is high.

[0075] 2. The present invention is provided with a one-way bearing 42 or other one-way mechanism to realize the adjustment of the presser foot pressure and the upper thread tension, and the two will not affect each other. It can not only keep the torque required by the presser foot assembly 6 and the thread clamping assembly at all times, but also adjust the size of the torque at any time; according to the thickness of different sewn fabrics, the appropriate upper thread tension and presser foot pressure can be automatically adjusted, so that the intelligence and digitization level of the machine are improved, and the competitiveness of the product is further enhanced.

[0076] 3. In this embodiment, the control logic of the three adjustment functions of presser foot pressure, upper thread tension, and automatic thread loosening can be realized only by the forward and reverse rotation of a driving motor 1.

[0077] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0078] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A sewing machine, characterized in that: The invention comprises a housing (44), a main shaft, a presser foot assembly (6), a needle thread tension adjustment mechanism, a presser foot pressure adjustment mechanism, a drive motor (1), a drive motor encoder, and a control component. The main shaft is arranged in the housing (44). The presser foot assembly (6) is transmission-connected to the main shaft and is arranged in the housing (44) so ​​as to be movable up and down. The drive motor (1) is fixed to the housing (44) through a motor mounting frame. The drive motor (1) is transmission-connected to the needle thread tension adjustment mechanism and the presser foot pressure adjustment mechanism at the same time. The needle thread tension adjustment mechanism is used to adjust the needle thread tension, and the presser foot pressure adjustment mechanism is used to adjust the presser foot pressure. The drive motor encoder is connected to the drive motor (1), and the control component is communicatively connected to the drive motor encoder.

2. The sewing machine according to claim 1, characterized in that: The surface thread tension adjustment mechanism comprises a surface thread tension driving cam (3), a surface thread tension transmission assembly, a pull rod (27), and a thread clamping assembly. The surface thread tension driving cam (3) is mounted on the motor shaft of the driving motor (1); the surface thread tension driving cam (3) is connected to the input end of the surface thread tension transmission assembly, the output end of the surface thread tension transmission assembly is connected to the pull rod (27), and the pull rod (27) is connected to the thread clamping assembly; the surface thread tension transmission assembly comprises a transmission lever (22), a support column (5), a reset torsion spring (4), a transmission slide rod (24), and a guide sleeve (25); one end of the support column (5) is connected to the motor mounting frame, the other end of the support column (5) is hinged to the transmission lever (22), and the reset torsion spring (4) is connected to the guide sleeve (25). The torsion spring (4) is sleeved on the outer surface of the support column (5) and connected to the transmission lever (22); an upper transmission bearing (21) is arranged at the top end of the transmission lever (22), and the surface line tension driving cam (3) is in contact with the upper transmission bearing (21); a lower transmission slide groove (2201) is provided at the bottom end of the transmission lever (22); one end of the transmission slide rod (24) is connected to a transmission slide rod connecting pin (23), and the transmission slide rod connecting pin (23) is clamped in the lower transmission slide groove (2201); the guide sleeve (25) is arranged in the housing (44), the transmission slide rod (24) is inserted into the guide sleeve (25), and the end of the transmission slide rod (24) away from the transmission slide rod connecting pin (23) is connected to the pull rod (27).

3. The sewing machine according to claim 2, characterized in that: The wire clamping assembly comprises a wire clamping adjustment seat (29), a wire clamping pin (28), a wire take-up spring (37), a rear wire clamping plate (36), a front wire clamping plate (35), a pressure plate (30), a wire clamping spring (34), a pressure sleeve (31), and a push plate (32); the wire clamping adjustment seat (29) is arranged in a housing (44); the wire clamping pin (28) is inserted into the wire clamping adjustment seat (29); the pull rod (27) passes through the wire clamping pin (28); the wire take-up spring (37) is sleeved on the wire clamping pin (28); the rear wire clamping plate (36), the front wire clamping plate (35), the pressure plate (30), the wire clamping spring (34), a pressure sleeve (31), and a push plate (32); The clamping pin (34) and the pressing sleeve (31) are both sleeved on the clamping pin (28), the pressing plate (30) is in contact with the front clamping plate (35), the clamping spring (34) is arranged between the pressing plate (30) and the pressing sleeve (31), the clamping pin (28) is provided with a clamping pin slot, the end of the pull rod (27) away from the transmission slide rod (24) is provided with a pull rod convex cap, the push plate (32) is fixed on the pressing sleeve (31), and the bottom end of the push plate (32) is located in the clamping pin slot; when the pull rod (27) slides in the clamping pin (28), the pull rod convex cap is in contact with or separated from the bottom end of the push plate (32).

4. The sewing machine according to claim 1, characterized in that: The presser foot pressure regulating mechanism comprises a one-way transmission device, a presser foot pressure driving cam (38), a roller (39), a presser foot pressure driving crank (41), and a presser foot pressure transmission assembly. The one-way transmission device is arranged on a motor mounting frame, and the presser foot pressure driving cam (38) is sleeved on the one-way transmission device; the roller (39) is arranged on the end of the presser foot pressure driving cam (38) away from the motor mounting frame, and the presser foot pressure driving crank (41) is sleeved on the motor shaft of the driving motor (1), and the presser foot pressure driving crank (41) can abut against or separate from the roller (39); the outer peripheral surface of the presser foot pressure driving cam (38) is connected to the presser foot assembly (6) through the presser foot pressure transmission assembly; The one-way transmission device comprises a bearing mounting seat (43) and a one-way bearing (42); the bearing mounting seat (43) is fixedly connected to the motor mounting frame; the inner ring of the one-way bearing (42) is sleeved on the bearing mounting seat (43); and the inner wall of the presser foot pressure driving cam (38) is sleeved on the outer ring of the one-way bearing (42).

5. The sewing machine according to claim 4, characterized in that: The presser foot pressure transmission assembly comprises a swing crank (18), a roller (19), a drive shaft (17), an adjusting connecting rod (15), a slider seat (11), a slider (10), an upper sliding rod (12), a pressure regulating spring (9), a pressure regulating guide rod (8), a presser foot rod (7), and an upper shaft sleeve (13); the drive shaft (17) is rotatably arranged in a housing (44); one end of the drive shaft (17) is connected to the swing crank (18), and the other end is connected to the adjusting connecting rod (15); the roller (19) is arranged on the swing crank (18), and the roller (19) abuts against or separates from the outer peripheral surface of the presser foot pressure driving cam (38); the adjusting connecting rod (15) A slider (10) is provided at the end away from the driving shaft (17), the slider (10) is clamped in the slider seat (11), the slider seat (11) is fixed on the outer peripheral surface of the upper slide rod (12), the upper slide rod (12) is slidably arranged in the upper shaft sleeve (13), and the upper shaft sleeve (13) is fixed in the casing (44); a blind hole is opened in the axial direction of the upper slide rod (12), the pressure regulating guide rod (8) is arranged in the blind hole, the pressure regulating spring (9) is sleeved on the outer periphery of the pressure regulating guide rod (8), the top of the presser foot rod (7) is connected to the bottom end of the pressure regulating spring (9), and the presser foot assembly (6) is arranged at the bottom of the presser foot rod (7).

6. The sewing machine according to claim 5, characterized in that: A top cap (14) is also provided on the upper side of the upper sleeve (13), and a pressure regulating bolt is provided in the top cap (14). The bottom end of the pressure regulating bolt can abut against or separate from the top end of the upper slide rod (12); the one-way transmission device can be replaced by a pawl or ratchet mating piece.

7. The sewing machine according to claim 1, characterized in that: The sewing machine further comprises a function operation switch, a spindle motor, a spindle encoder, a thread trimming mechanism, a displacement sensor, and a presser foot lifting mechanism, wherein the function operation switch is used to realize the function of the sewing machine; the spindle motor is connected to the spindle encoder, and the spindle motor is connected to the spindle transmission for driving the spindle to rotate; the thread trimming mechanism is used to cut the surface thread of the sewing material; the displacement sensor is arranged on the presser foot assembly (6) for detecting the thickness of the sewing material; the presser foot lifting mechanism is used to realize the lifting and lowering of the presser foot assembly (6); the function operation switch, the spindle encoder, the thread trimming mechanism, the displacement sensor, and the presser foot lifting mechanism are all connected to the control assembly for communication.

8. The sewing machine according to claim 7, characterized in that: The control component comprises an operation panel, a central processing unit, an electronic controller, and a storage unit. The operation panel is used to input set parameters; the central processing unit is used to process the input information and output the information; the electronic controller is used to receive the information from the central processing unit and execute it; the storage unit is used to store information, and the storage unit includes the corresponding parameter values ​​of the angle of the drive motor (1) and the pressure of the presser foot and the tension of the upper thread.

9. A control method for a sewing machine, using the sewing machine according to any one of claims 1 to 8, wherein the sewing machine comprises a control component, wherein the control component comprises an operation panel, a central processing unit, an electronic controller, and a storage unit; characterized in that: Here are the steps: S1: The operator inputs sewing parameters into the control component through the operation panel according to the specifications and materials of the sewing materials; S2: the control component receives the input sewing parameters, the central processing unit processes and analyzes the input sewing parameter information and sends it to the electronic control controller, and the electronic control controller controls the drive motor (1) to rotate a corresponding angle; S3: The drive motor (1) is working, the motor shaft of the drive motor (1) drives the surface thread tension adjustment mechanism to work to adjust the surface thread tension, and the motor shaft of the drive motor (1) drives the presser foot pressure adjustment mechanism to work to adjust the presser foot pressure.

10. The control method of a sewing machine according to claim 9, characterized in that: The storage unit includes the corresponding parameters of the angle of the drive motor (1) and the pressure of the presser foot and the tension of the upper thread; in step S2, the central processing unit processes and analyzes the input sewing parameters, that is, the central processing unit determines the rotation angle of the drive motor (1) according to the sewing parameter information.

Images