Sewing machine provided with labor-saving presser foot device

Abstract

The technical scheme belongs to the technical field of sewing machines, and particularly relates to a sewing machine provided with a labor-saving presser foot device. The machine needle device is arranged in the sewing machine shell and used for sewing; the presser foot device is arranged in the sewing machine shell and used for lifting or putting down a presser foot; the presser foot device comprises a first driving motor, a second driving motor, a third driving motor and a fourth driving motor, the first-stage transmission assembly comprises a driving crank, and the driving crank is installed on the first output shaft; the second-stage transmission assembly comprises a lever and a transmission connecting rod, the rear end of the lever is hinged to the sewing machine shell, the front end of the lever is hinged to the upper end of the transmission connecting rod, and the lower end of the transmission connecting rod is hinged to the presser foot rod; the presser foot mechanism comprises a presser foot rod and a presser foot, the presser foot rod is vertically installed on the sewing machine shell, and the presser foot is installed on the lower portion of the presser foot rod; a bearing mechanism is arranged between the first-stage transmission assembly and the second-stage transmission assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of sewing machines, and in particular to a sewing machine equipped with a labor-saving presser foot device. Background Art

[0002] When sewing with a sewing machine, the thread hooking mechanism of the sewing machine cannot hook the thread loop of the needle and thread, resulting in no complete continuous stitch being formed in the seam. This discontinuous stitch is called a skipped stitch. In order to realize the anti-skipped stitch function of the sewing machine, the current common practice is to add a presser foot mechanism to the sewing machine. The presser foot mechanism moves up and down with the needle to improve the stability of sewing.

[0003] Chinese patent CN220789021U discloses a sewing machine and a presser foot height adjustment device thereof. The transmission mode of the presser foot mechanism of this sewing machine is to directly connect the first connecting rod through the drive rod provided at the output end of the drive motor to transmit the power. The drive motor directly drives the presser foot mechanism. This "straight up and straight down" transmission mode increases the operating burden of the drive motor and requires a larger output torque of the drive motor. In this way, the power and volume of the drive motor are inevitably larger, and the heat generation phenomenon is serious. Therefore, a more labor-saving and stable driving mode is urgently needed. Summary of the Invention

[0004] The purpose of this technical solution is to provide a sewing machine equipped with a labor-saving presser foot device, which realizes the lifting and lowering control of the presser foot mechanism by the driving motor through the cooperation of the first-stage transmission assembly and the second-stage transmission assembly, thereby solving the labor-consuming problem caused by the driving motor directly driving the presser foot mechanism of the original sewing machine.

[0005] The purpose of this technical solution is achieved in this way:

[0006] A sewing machine equipped with a labor-saving presser foot device comprises: a sewing machine housing; a needle device, which is arranged in the sewing machine housing and is used for sewing; and a presser foot device, which is arranged in the sewing machine housing and is used for lifting or lowering the presser foot; wherein, the presser foot device comprises: a driving motor having an output shaft; a first-stage transmission assembly, which comprises a driving crank, which is mounted on the output shaft; a second-stage transmission assembly, which comprises a lever and a transmission connecting rod, the rear end of the lever being hinged to the sewing machine housing, the front end of the lever being hinged to the upper end of the transmission connecting rod The lower end of the transmission connecting rod is hinged to the presser foot rod; and the presser foot mechanism includes a presser foot rod and a presser foot, the presser foot rod is vertically installed on the sewing machine housing, and the presser foot is installed at the lower part of the presser foot rod; a receiving mechanism is provided between the first-stage transmission assembly and the second-stage transmission assembly, and the receiving mechanism includes: a sliding groove, which is provided in the middle of the lever; and a sliding member, which is rotatably installed on the swinging end of the driving crank and movably placed in the sliding groove; wherein, the driving crank drives the lever to rotate around the hinge point through the sliding member to realize the lifting and lowering of the presser foot mechanism.

[0007] Preferably, the driving crank is sleeved on the outside of the output shaft, and a plug hole is opened at the front end of the driving crank; a plug rod is set in the plug hole; the sliding piece is sleeved on the front end of the plug rod; when the front end of the driving crank makes a circular motion, the sliding piece slides in the sliding groove.

[0008] Preferably, a presser foot guide is provided at the lower end of the transmission connecting rod, and the presser foot guide has a second plug-in hole; the upper end of the presser foot rod is arranged in the second plug-in hole.

[0009] Preferably, the front end of the presser foot guide frame has a guide portion, and a vertical slide groove 1 is provided on the inner side of the sewing machine housing, and the guide portion is movably placed in the slide groove 1 of the sewing machine housing.

[0010] Preferably, the driving motor is arranged inside the sewing machine housing and close to the rear side of the sewing machine housing; a hinge seat is provided on the inner wall of the rear side of the sewing machine housing, and the rear end of the lever is hinged on the hinge seat.

[0011] Preferably, the sliding groove is a rectangular groove and is arranged along the length direction of the lever; the sliding member is a square member, and the upper and lower surfaces of the sliding member are in contact with the upper and lower surfaces of the sliding groove; the length of the sliding groove is greater than the length of the sliding member.

[0012] Preferably, when the driving crank swings to a horizontal state, the lever is in a horizontal state and the transmission connecting rod is in a vertical state.

[0013] Preferably, the needle device includes: a second drive motor having a second output shaft; a drive cam, which is arranged at the front end of the second output shaft, and a transmission shaft is provided on the drive cam; a transmission part, which is arranged at the front end of the transmission shaft; a transmission rod, which is hinged on the transmission part; and a needle, which is installed on the transmission rod; wherein, the second drive motor realizes the rotation of the drive cam through the second output shaft, and then realizes the lifting and lowering of the needle through the transmission part and the transmission rod.

[0014] Preferably, the needle device also includes a paddle, a middle portion of which is hinged in the sewing machine housing through a fixing pin; the fixing pin is arranged in the sewing machine housing through a fixing part; the front end of the paddle extends out of the sewing machine housing, and the rear end is sleeved outside the transmission shaft; wherein, the driving cam can be rotated by manually pushing the front end of the paddle.

[0015] Preferably, a second slide groove is provided in the sewing machine housing, and the rear end of the transmission rod is movably placed in the second slide groove.

[0016] Compared with the existing technology, this technical solution has the following outstanding and beneficial technical effects:

[0017] 1. The technical solution is designed with a two-stage transmission assembly. The driving motor 1 cooperates with the first-stage transmission assembly and the second-stage transmission assembly to realize the lifting and lowering of the presser foot mechanism, and the connecting mechanism arranged between the first-stage transmission assembly and the second-stage transmission assembly can rotate the lever. The rotation of the lever drives the transmission connecting rod to move at the same time. This transmission method has the effect of saving effort and being stable, so it reduces the burden on the driving motor 1 and extends the service life of the driving motor 1.

[0018] 2. The connecting mechanism designed in this technical solution can achieve that when the driving crank swings a large amplitude, the lever and the transmission connecting rod only swing a small amplitude, which can reduce the wear between the components and improve the force transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of the presser foot device installed on the sewing machine housing.

[0020] Figure 2 This is an exploded view of the presser foot device.

[0021] Figure 3 This is a structural diagram of the needle device installed on the sewing machine housing.

[0022] Figure 4 for Figure 3 Enlarged image at the center X.

[0023] 1. Presser foot mechanism; 2. Presser foot rod; 3. Presser foot guide frame; 4. Presser foot mechanism; 5. Presser foot rod; 6. Presser foot guide frame; 7. Presser foot mechanism; 8. Presser foot rod; 9. Presser foot guide frame; 10. Presser foot guide frame; 11. Presser foot mechanism; 12. Presser foot guide frame; 13. Presser foot guide frame; 14. Presser foot mechanism; 15. Presser foot mechanism; 16. Presser foot guide frame; 17. Presser foot guide frame; 18. Presser foot mechanism; 19. Presser foot mechanism; 20. Presser foot mechanism; 21. Presser foot mechanism; 22. Presser foot mechanism; 23. Presser foot mechanism; 24. Presser foot mechanism; 25. Presser foot mechanism; 26. Presser foot mechanism; 27. Presser foot mechanism; 28. Presser foot mechanism; 29. ​​Presser foot mechanism; 30. Presser foot mechanism; 31. Presser foot mechanism; 32. Presser foot mechanism; 33. Presser foot mechanism; 34. Presser foot mechanism; 35. Presser foot mechanism; 36. Presser foot mechanism; 37. Presser foot mechanism; 38. Presser foot mechanism; 39. Presser foot mechanism; 40. Presser foot mechanism; 41. Presser foot mechanism; 42. Presser foot mechanism; 43. Presser foot mechanism; 44. Presser foot mechanism; 45. Presser foot mechanism; 46. Presser foot mechanism; 47. Presser foot mechanism; 48. Presser foot mechanism; 49. Presser foot mechanism; 50. Presser foot mechanism; 51. Presser foot mechanism; 52. Presser foot mechanism; 53. Presser foot mechanism; 54. Presser foot mechanism; 55. Presser foot mechanism; 56. Presser foot mechanism; 57. Presser foot mechanism DETAILED DESCRIPTION

[0024] The specific implementation of the technical solution is further described in detail below with reference to the accompanying drawings.

[0025] like Figure 1 As shown, a sewing machine equipped with a labor-saving presser foot device includes a sewing machine housing 6, a needle device 7 and a presser foot device 1. The needle device 7 is used for sewing, and the presser foot device 1 is used for auxiliary sewing. The presser foot device 1 is installed on the sewing machine housing 6, and includes a drive motor 11, a first-stage transmission assembly 2, a second-stage transmission assembly 3 and a presser foot mechanism 4, and a receiving mechanism 5 is provided between the first-stage transmission assembly 2 and the second-stage transmission assembly 3. The drive motor 11 is used to lift or lower the presser foot 42, the first-stage transmission assembly 2 and the second-stage transmission assembly 3 are used to transmit the force output by the drive motor 11, and the receiving mechanism 5 is used to realize the transmission between the first-stage transmission assembly 2 and the second-stage transmission assembly 3.

[0026] Specifically, if Figure 1 and Figure 2 As shown, the driving motor 11 has an output shaft 12, the first-stage transmission assembly 2 includes a driving crank 21, and the driving crank 21 is detachably mounted on the output shaft 12 by screws. The second-stage transmission assembly 3 includes a lever 31 and a transmission connecting rod 32. The rear end of the lever 31 is hinged to the sewing machine housing 6, the front end of the lever 31 is hinged to the upper end of the transmission connecting rod 32, and the lower end of the transmission connecting rod 32 is hinged to the presser foot rod 41. Therefore, when the lever 31 rotates around the hinge point, the transmission connecting rod 32 can synchronously drive the presser foot rod 41 to move. The presser foot mechanism 4 includes a presser foot rod 41 and a presser foot 42. The presser foot rod 41 is vertically mounted on the sewing machine housing 6, and the presser foot 42 is mounted at the lower part of the presser foot rod 41.

[0027] Furthermore, in order to realize the transmission between the first-stage transmission assembly 2 and the second-stage transmission assembly 3, we set up a receiving mechanism 5, which includes a sliding groove 51 and a sliding member 52. The sliding groove 51 is set in the middle of the lever 31, and the sliding member 52 is rotatably installed on the swing end of the driving crank 21 and movably placed in the sliding groove 51, so the driving motor 11 can first control the rotation of the sliding member 52. At the same time, when the sliding member 52 moves in the sliding groove 51, it can drive the lever 31 to rotate around the hinge point to realize the lifting and lowering of the presser foot mechanism 4.

[0028] like Figure 2 As shown, the driving crank 21 is sleeved on the outside of the output shaft 12, and a plug hole 22 is provided at the front end of the driving crank 21. A plug rod 23 is provided in the plug hole 22, and a sliding member 52 is sleeved on the front end of the plug rod 23. When the front end of the driving crank 21 makes a circular motion, the sliding member 52 slides in the sliding groove 51.

[0029] Furthermore, the surface of the sliding member 52 also has a snap-in hole 53, and the front end of the plug-in rod 23 is embedded in the snap-in hole 53, so that the sliding member 52 can be fixed on the driving crank 21 along the axial direction of the plug-in rod 23, which can effectively prevent the sliding member 52 from detaching from the plug-in rod 23, and at the same time realize the radial rotation of the sliding member 52.

[0030] like Figure 1 and Figure 2 As shown, a presser foot guide 33 is provided at the lower end of the transmission connecting rod 32, and the presser foot guide 33 has a second plug-in hole 34. The upper end of the presser foot rod 41 is arranged in the second plug-in hole 34, and the front end of the presser foot guide 33 has a guide portion 35. A vertical slide groove 1 36 is provided on the inner side of the sewing machine housing 6. The guide portion 35 is movably placed in the slide groove 1 36 of the sewing machine housing 6. The design of the guide portion 35 and the slide groove 1 36 can ensure the stability of the movement of the presser foot rod 41.

[0031] like Figure 1 and Figure 2 As shown, the drive motor 11 is arranged inside the sewing machine housing 6 and close to the rear side of the sewing machine housing 6. A hinge seat 61 is provided on the inner wall of the rear side of the sewing machine housing 6. The rear end of the lever 31 is hinged on the hinge seat 61. The position of the sliding member 52 from the output shaft 12 is less than the distance between the sliding member 52 and the hinge point of the lever 31. Therefore, when the sliding member 52 lifts the middle part of the lever 31 for a distance, the front end of the lever 31 has moved a large distance, thereby achieving the effect of saving effort for the drive motor 11.

[0032] Furthermore, the sliding groove 51 is a rectangular groove and is arranged along the length direction of the lever 31. The sliding member 52 is a square member. The upper and lower surfaces of the sliding member 52 are fitted with the upper and lower surfaces of the sliding groove 51. This arrangement can increase the fitting area between the sliding member 52 and the sliding groove 51, and increase the stability of the sliding member 52 moving in the sliding groove 51.

[0033] like Figure 1 and Figure 2 As shown, the length of the sliding groove 51 is greater than the length of the sliding member 52. When the sliding member 52 slides in the sliding groove 51, it also rotates around the plug-in rod 23, so that the smoothness of its transmission can be ensured. When the crank 21 is driven to swing to a horizontal state, the lever 31 is in a horizontal state and the transmission connecting rod 32 is in a vertical state.

[0034] Furthermore, the length of the lever 31 is greater than or equal to the length of the transmission connecting rod 32, which can ensure a good labor-saving effect when lifting or lowering the presser foot rod 41.

[0035] like Figure 3 and Figure 4 As shown, the needle device 7 includes a driving motor 71, a driving cam 73, a transmission part 75, a transmission rod 76 and a needle 77. The driving motor 71 has an output shaft 72 and is arranged inside the sewing machine housing 6. The driving cam 73 is arranged at the front end of the output shaft 72 and can rotate with the output shaft 72. A transmission shaft 74 is provided on the driving cam 73. The transmission part 75 is provided at the front end of the transmission shaft 74. The transmission rod 76 is hinged on the transmission part 75. The left and right sides of the front end of the transmission rod 76 are respectively provided with a slider 82 and a mounting part 83. The needle 77 is inserted in the mounting part 83. The driving motor 71 realizes the rotation of the driving cam 73 through the output shaft 72, and then realizes the lifting and lowering of the needle 77 through the transmission part 75 and the transmission rod 76.

[0036] Furthermore, the needle device 7 also includes a paddle 78, which is used to manually adjust the position of the needle 77. The middle part of the paddle 78 is hinged in the sewing machine housing 6 through a fixing pin 79, and the fixing pin 79 is set in the sewing machine housing 6 through a fixing part 80. The fixing part 80 is an arc-shaped part, one end of which is fixed in the sewing machine housing 6 by a pin, and the other end is used to set the fixing pin 79. Since there are many parts inside the sewing machine housing 6, the space is extremely compact. The setting of the fixing part 80 can ensure that the space utilization rate in the sewing machine housing 6 is large. The front end of the paddle 78 extends out of the sewing machine housing 6, and the rear end is sleeved outside the transmission shaft 74. In this way, the personnel can manually move the front end of the paddle 78 to rotate the drive cam 73 to adjust the position of the needle 77.

[0037] Furthermore, a second slide groove 81 is provided in the sewing machine housing 6, and a slider 82 provided on the transmission rod 76 is movably placed in the second slide groove 81. When the transmission rod 76 moves, the cooperation between the slider 82 and the second slide groove 81 can make its movement more stable.

[0038] The above shows and describes the basic principles and main features of the present technical solution and the advantages of the present technical solution. Those skilled in the art should understand that the present technical solution is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present technical solution. Various changes and improvements may be made to the present technical solution without departing from the spirit and scope of the present technical solution. Such changes and improvements fall within the scope of the present technical solution for which protection is sought. The scope of protection claimed by the present technical solution is defined by the appended claims and their equivalents.

Claims

1. A sewing machine equipped with a labor-saving presser foot device, characterized in that: include: Sewing machine housing (6); A needle device (7), which is arranged in the sewing machine housing (6) and is used for sewing; as well as A presser foot device (1) is arranged in the sewing machine housing (6) and is used to raise or lower the presser foot (42); Wherein, the presser foot device (1) comprises: A driving motor (11) having an output shaft (12); A first-stage transmission assembly (2) comprising a drive crank (21) mounted on the output shaft (12); a second-stage transmission assembly (3), comprising a lever (31) and a transmission connecting rod (32), wherein the rear end of the lever (31) is hinged to the sewing machine housing (6), the front end of the lever (31) is hinged to the upper end of the transmission connecting rod (32), and the lower end of the transmission connecting rod (32) is hinged to the presser foot rod (41); and A presser foot mechanism (4), comprising a presser foot rod (41) and a presser foot (42), wherein the presser foot rod (41) is vertically mounted on a sewing machine housing (6), and the presser foot (42) is mounted on the lower portion of the presser foot rod (41); A receiving mechanism (5) is provided between the first-stage transmission assembly (2) and the second-stage transmission assembly (3), and the receiving mechanism (5) comprises: a sliding groove (51) provided in the middle of the lever (31); and a sliding member (52) rotatably mounted on the swing end of the driving crank (21) and movably placed in the sliding groove (51); The driving crank (21) drives the lever (31) to rotate around the hinge point through the sliding member (52) to achieve the lifting and lowering of the presser foot mechanism (4).

2. A sewing machine equipped with a labor-saving presser foot device according to claim 1, characterized in that: The driving crank (21) is sleeved on the outside of the output shaft (12), and a plug hole (22) is provided at the front end of the driving crank (21); a plug rod (23) is provided in the plug hole (22); and the sliding member (52) is sleeved on the front end of the plug rod (23); When the front end of the driving crank (21) performs circular motion, the sliding member (52) slides in the sliding groove (51).

3. A sewing machine equipped with a labor-saving presser foot device according to claim 2, characterized in that: The lower end of the transmission connecting rod (32) is provided with a presser foot guide frame (33), and the presser foot guide frame (33) has a second plug hole (34); the upper end of the presser foot rod (41) is arranged in the second plug hole (34).

4. A sewing machine equipped with a labor-saving presser foot device according to claim 3, characterized in that: The front end of the presser foot guide frame (33) has a guide portion (35), and the inner side of the sewing machine housing (6) is provided with a vertical slide groove (36), and the guide portion (35) is movably placed in the slide groove (36) of the sewing machine housing (6).

5. A sewing machine equipped with a labor-saving presser foot device according to claim 4, characterized in that: The driving motor 1 (11) is arranged inside the sewing machine housing (6) and close to the rear side of the sewing machine housing (6); A hinge seat (61) is provided on the inner wall of the rear side of the sewing machine housing (6), and the rear end of the lever (31) is hinged on the hinge seat (61).

6. A sewing machine equipped with a labor-saving presser foot device according to claim 5, characterized in that: The sliding groove (51) is a rectangular groove and is arranged along the length direction of the lever (31); The sliding member (52) is a square member, and the upper and lower surfaces of the sliding member (52) are in contact with the upper and lower surfaces of the sliding groove (51); The length of the sliding groove (51) is greater than the length of the sliding member (52).

7. A sewing machine equipped with a labor-saving presser foot device according to claim 6, characterized in that: When the driving crank (21) swings to a horizontal state, the lever (31) is in a horizontal state, and the transmission connecting rod (32) is in a vertical state.

8. A sewing machine equipped with a labor-saving presser foot device according to any one of claims 1 to 7, characterized in that: The needle device (7) comprises: A second driving motor (71) having a second output shaft (72); A driving cam (73) is arranged at the front end of the second output shaft (72), and a transmission shaft (74) is arranged on the driving cam (73); a transmission part (75) disposed at the front end of the transmission shaft (74); a transmission rod (76) hinged to the transmission portion (75); and a machine needle (77), which is mounted on the transmission rod (76); The second driving motor (71) drives the cam (73) to rotate via the second output shaft (72), and then drives the needle (77) to rise and fall via the transmission part (75) and the transmission rod (76).

9. A sewing machine equipped with a labor-saving presser foot device according to claim 8, characterized in that: The needle device (7) further comprises a paddle (78), the center of which is hinged in the sewing machine housing (6) via a fixing pin (79); The fixing pin (79) is arranged in the sewing machine housing (6) via a fixing member (80); The front end of the paddle (78) extends out of the sewing machine housing (6), and the rear end is sleeved outside the transmission shaft (74); The driving cam (73) can be rotated by manually moving the front end of the paddle (78).

10. A sewing machine equipped with a labor-saving presser foot device according to claim 9, characterized in that: A second slide groove (81) is provided in the sewing machine housing (6), and the rear end of the transmission rod (76) is movably placed in the second slide groove (81).

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