Stitch length adjusting mechanism, presser foot lifting mechanism and sewing machine

Abstract

The utility model provides a stitch length adjusting mechanism, presser foot lifting mechanism and sewing machine, stitch length adjusting mechanism includes casing, tooth frame and transmission shaft subassembly, tooth frame hinge joint is provided on the transmission rod subassembly, also includes power source no. 1, stitch length cam, follower, transmission piece and reset piece no. The stitch length cam is arranged on the power rod, the driven part is arranged between the transmission part and the stitch length cam, when the first power source drives the stitch length cam to rotate, the stitch length cam drives the driven part to swing and enables the transmission part to drive the transmission shaft assembly to adjust the position of the tooth frame, and the first reset part is arranged at the side end of the driven part and controls the stitch length cam to rotate through the first power source. Therefore, the driven piece is driven to swing, the transmission piece drives the transmission shaft assembly to rotate, the position of the tooth frame is adjusted, and the purposes of labor-saving adjustment and high adjustment precision are achieved.

Description

Technical Field

[0001] This utility model relates to sewing machines, and more particularly to a stitch length adjustment mechanism, a presser foot lifting mechanism, and a sewing machine. Background Technology

[0002] Older sewing machines typically adjust the stitch length using a wrench shaft and control the presser foot adjustment mechanism via an old-fashioned knee rest. Modern sewing machines adjust the stitch length manually using the stitch length adjustment mechanism and simultaneously adjust the presser foot using the presser foot adjustment mechanism. This makes the adjustment process more strenuous for the operator and results in poorer adjustment accuracy. Utility Model Content

[0003] In view of this, the first objective of this utility model is to provide a needle spacing adjustment mechanism, which has the advantages of precise and labor-saving needle spacing adjustment.

[0004] The technical solution of this utility model is: a stitch pitch adjustment mechanism, including a housing, a tooth frame, and a transmission shaft assembly. The tooth frame is hinged to the transmission rod assembly. It also includes a power source, a stitch pitch cam, a follower, a transmission component, and a reset component. The output end of the power source is provided with a power rod. The stitch pitch cam is provided on the power rod. The follower is provided between the transmission component and the stitch pitch cam. When the power source drives the stitch pitch cam to rotate, the stitch pitch cam drives the follower to swing and causes the transmission component to drive the transmission shaft assembly to adjust the position of the tooth frame. The reset component is provided on the side end of the follower.

[0005] By using the above-mentioned technical means, the power source controls the rotation of the pin cam, which in turn drives the driven component to swing, causing the transmission component to drive the transmission shaft assembly to rotate, thereby adjusting the position of the gear carrier and achieving the purpose of easy adjustment and high adjustment accuracy.

[0006] Preferably, the driven member includes a needle pitch connecting rod, one end of which is hinged to the machine housing to form a hinge point, and the other end is fixedly connected to the transmission member to form a fixed point. The needle pitch connecting rod is also provided with an abutment member that cooperates with the needle pitch cam, and the abutment member is disposed between the hinge point and the fixed point.

[0007] By means of the above-mentioned technology, the needle pitch connecting rod is hinged to the machine housing, and the transmission component is fixed at the other end of the needle pitch connecting rod. Thus, when the needle pitch cam rotates, it drives the needle pitch connecting rod to rotate around the hinge point, thereby realizing the oscillation of the transmission component.

[0008] Preferably, the abutting member includes a bearing, and the side end of the pin cam abuts against the side end of the bearing.

[0009] By using the above-mentioned technical means, the friction between the pin pitch cam and the pin pitch connection is reduced by using a bearing, thereby reducing the noise emitted by the equipment.

[0010] Preferably, the transmission component includes a stitch pitch adjusting link, a connector, and a feed lever. The stitch pitch adjusting link is fixed to the stitch pitch link. The connector is hinged to the machine housing, with one end hinged to the stitch pitch adjusting link and the other end fixed to the feed lever. The other end of the feed lever is fixed to the transmission shaft assembly.

[0011] Through the above-mentioned technical means, the needle pitch connecting rod is hinged around the hinge point to drive the needle pitch adjusting connecting rod to move, which in turn drives the first joint and the fabric feeding swing rod to swing, thereby driving the transmission shaft assembly to adjust the position of the pressure frame.

[0012] Preferably, the drive shaft assembly includes a guide rod, a toothed crank, and a feed crank. The toothed crank and the feed crank are both fixedly sleeved on the guide rod. The feed rocker arm is hinged to the feed crank, and the toothed crank is hinged to the toothed frame.

[0013] The needle pitch can be adjusted by means of the above-mentioned technical methods and the hinge between the crank and the dental frame.

[0014] The second objective of this invention is to provide a presser foot lifting mechanism that has the advantages of precise and labor-saving adjustment of the presser foot lifting speed.

[0015] The technical solution of this utility model is: a presser foot lifting mechanism, including a presser foot assembly, a power rod provided at the output end of the power source one, and a presser foot lifting cam, a second transmission adjustment assembly and a reset member two. The presser foot lifting cam is provided on the power rod, the second transmission adjustment assembly is provided between the presser foot assembly and the presser foot lifting cam, when the power rod drives the presser foot lifting cam to rotate, the second transmission adjustment assembly drives the presser foot assembly to move upward, and the reset member two is provided at the upper end of the presser foot assembly and is used to reset the presser foot assembly.

[0016] Through the above-mentioned technical means, the presser foot assembly is automatically lifted by the cooperation between the presser foot lifting cam and the second transmission component, thereby controlling the presser foot assembly to lift and lower accurately and effortlessly, and the presser foot assembly is reset by the reset component.

[0017] Preferably, the second transmission adjustment assembly includes a guide plate connecting rod, a presser foot lifting guide plate, a presser foot lifting rear lever, a lever rod, a knee-controlled lifting lever, and a presser foot lifting frame. One end of the guide plate connecting rod is hinged to the machine housing, and the other end is hinged to one end of the presser foot lifting guide plate. The other end of the presser foot lifting guide plate has an elongated hole. One end of the presser foot lifting rear lever slides within the elongated hole. The middle part of the presser foot lifting rear lever is hinged to the machine housing, and the other end is fixedly connected to one end of the lever rod. The other end of the lever rod is fixed to the knee-controlled lifting lever. The knee-controlled lifting lever is hinged to the machine housing and fixed to the presser foot lifting frame. The presser foot lifting frame is slidably disposed and fixedly connected to the presser foot assembly.

[0018] Through the above-mentioned technical means, the lifting cam rotates to drive the guide plate connecting rod to swing and drive the subsequent pressing foot assembly to move, thereby completing the precise lifting and lowering of the pressing foot assembly.

[0019] Preferably, the pressure foot assembly includes a pressure rod, a pressure adjusting guide rod, and a pressure foot. The pressure foot is disposed at the bottom of the pressure rod, and a guide hole is also provided inside the pressure rod. The pressure adjusting guide rod is slidably disposed in the guide hole. The second reset component includes a pressure adjusting spring, which is sleeved on the pressure adjusting guide rod.

[0020] The above-mentioned technical means enable the presser foot to be raised and lowered. By setting an adjusting spring, when the toothed bracket moves the presser foot upward, the presser foot presses against the toothed bracket, thereby ensuring the stability of feeding.

[0021] The third objective of this invention is to provide a sewing machine that has the advantages of precise and labor-saving adjustment of stitch length and presser foot speed.

[0022] The technical solution of this utility model is: a sewing machine, including a machine housing, the power source including a servo motor, the stitch distance cam and the presser foot cam being fixedly mounted on the power rod, and the flanges of the stitch distance cam and the presser foot cam being arranged in opposite directions.

[0023] By employing the aforementioned technical means, and by setting the flanges of the stitch length cam and the presser foot cam in opposite directions, when the stitch length needs to be adjusted, rotating the stitch length cam will not cause the presser foot cam to swing, thereby saving servo motor costs and space costs, reducing the production cost of the sewing machine, and increasing the compactness of the sewing machine.

[0024] Preferably, when the power source drives the power rod to rotate clockwise, the lifting foot cam drives the guide plate connecting rod to swing; when the power source drives the power rod to rotate counterclockwise, the needle pitch cam drives the needle pitch connecting rod to swing.

[0025] The above-mentioned technical means are used to control the needle spacing or lift the presser foot by rotating the needle forward and backward.

[0026] Compared with the prior art, the beneficial effects of this utility model are:

[0027] By setting the flanges of the stitch length cam and the presser foot cam in opposite directions, when the stitch length needs to be adjusted, rotating the stitch length cam will not cause the presser foot cam to swing the second transmission adjustment component, thereby saving servo motor costs and space costs, reducing the production cost of the sewing machine, and increasing the compactness of the sewing machine. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of Example 1. Figure 1 ;

[0029] Figure 2This is a schematic diagram of the structure of Example 1. Figure 2 ;

[0030] Figure 3 This is a schematic diagram of the structure of Example 2;

[0031] Figure 4 This is a schematic diagram of the structure of Example 3. Figure 1 ;

[0032] Figure 5 This is a schematic diagram of the structure of Example 3. Figure 2 ;

[0033] Figure 6 This is a schematic diagram of the structure of Example 3. Figure 3 .

[0034] Reference numerals: 10. Needle frame; 11. Drive shaft assembly; 12. Power source one; 121. Power rod; 13. Stitch cam; 14. Follower; 141. Transmission component; 142. Abutment component; 15. Reset component one; 16. Stitch cam link; 161. Hinge point; 162. Fixed point; 17. Stitch cam adjustment link; 18. Connector one; 19. Feeding lever; 20. Bearing one; 21. Feeding lever crank; 22. Stitch cam drive crank; 23. Guide rod; 24. Needle frame crank; 25. 30. Feeding crank; 32. Presser foot assembly; 33. Presser foot lifting cam; 34. Second transmission adjustment assembly; 35. Reset component two; 36. Guide plate connecting rod; 37. Presser foot lifting guide plate; 38. Presser foot lifting rear lever; 39. Lever pull rod; 40. Knee-controlled lifting lever; 41. Presser foot lifting frame; 42. Bearing two; 43. Long waist hole one; 44. Long waist hole two; 45. Stud; 46. Presser rod; 47. Pressure adjusting guide rod; 48. Presser foot; 60. Pressure adjusting spring; 61. Machine housing; 62. Servo motor. Detailed Implementation

[0035] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, so that the technical solution of this utility model can be more easily understood and mastered.

[0036] Example 1:

[0037] A needle spacing adjustment mechanism, such as Figure 1 , 2As shown, the device includes a housing 60, a tooth frame 10, and a drive shaft assembly 11. The tooth frame 10 is hinged to the drive rod assembly. It also includes a power source 12, a pin cam 13, a follower 14, a drive member 141, and a reset member 15. The output end of the power source 12 is provided with a power rod 121. The pin cam 13 is located on the power rod 121. The flange of the pin cam 13 is located on one side and is semi-circular. The follower is located between the drive member 141 and the pin cam 13. When the power source 12 drives the pin cam 13 to rotate, the pin cam 13 drives the follower 14 to swing and causes the drive member 141 to drive the drive shaft assembly 11 to adjust the position of the tooth frame 10. The reset member 15 includes a tension spring, which is located on the side of the first drive adjustment assembly.

[0038] The driven member 14 includes a needle pitch connecting rod 16, one end of which is hinged to the housing 60 to form a hinge point 161, and the other end is fixedly connected to the transmission member 141 to form a fixed point 162. The needle pitch connecting rod 16 is also provided with an abutment member 142 that cooperates with the needle pitch cam 13. The abutment member 142 is located between the hinge point 161 and the fixed point 162. The abutment member 142 includes a bearing 20. The side end of the needle pitch cam 13 abuts against the side end of the bearing 20. The bearing 20 reduces the friction between the needle pitch cam 13 and the needle pitch connection, thereby reducing the noise emitted by the equipment.

[0039] Transmission component 141 includes a stitch pitch adjusting linkage 17, a connector 18, and a feed lever 19. One end of the stitch pitch adjusting linkage 16 is hinged to the machine housing 60, and the other end is fixed to the stitch pitch adjusting linkage 17. The connector 18 is hinged to the machine housing 60, with one end hinged to the stitch pitch adjusting linkage 17 and the other end fixed to the feed lever 19. The other end of the feed lever 19 is fixed to the transmission shaft assembly 11. The connector 18 includes a feed lever crank 21 and a stitch pitch drive crank 22. The feed lever crank 21 is hinged to the machine housing 60, and the stitch pitch drive crank 22 is used to adjust the feed lever crank 21. The stitch pitch adjustment link 17 is connected to the feed swing arm 19. The adjustment link is hinged to the stitch pitch drive crank 22. The stitch pitch drive crank 22 is fixed to the feed swing arm 19. The stitch pitch adjustment link 17 is moved by the stitch pitch link 16 around the hinge point 161, and the feed swing arm crank 21 is rotated around the machine housing 60. This causes the stitch pitch drive crank 22 and the feed swing arm 19 to swing around the hinge point 161 of the feed swing arm crank 21. Finally, the transmission shaft assembly 11 is driven to adjust the position of the pressure frame, so as to achieve the purpose of high-precision and high-automation adjustment of the position of the tooth frame 10, while making the adjustment more labor-saving.

[0040] The drive shaft assembly 11 includes a guide rod 23, a toothed crank 24, and a feed crank 25. Both the toothed crank 24 and the feed crank 25 are fixedly sleeved on the guide rod 23. The first transmission adjustment assembly is hinged to the feed crank 25, and the toothed crank 24 is hinged to the toothed frame 10.

[0041] When adjustment is required, the power source 12 rotates the stitch distance cam 13, causing the flange of the stitch distance cam 13 to gradually abut against the bearing 20. At this time, the stitch distance connecting rod 16 rotates around the hinge point 161, and drives the stitch distance adjusting rod connecting rod to swing. The stitch distance adjusting connecting rod 17 pulls the feed swing arm crank 21 and the stitch distance drive crank 22 to rotate around the hinge point 161, and drives the feed swing arm 19 to rotate. The feed swing arm 19 drives the feed crank 25 to swing and causes the gripper crank 24 to adjust the position of the gripper 10, thus completing the stitch distance adjustment.

[0042] Example 2:

[0043] A presser foot lifting mechanism, such as Figure 3 As shown, the device includes a presser foot assembly 30, a housing 60, and a power source 12. The output end of the power source 12 is provided with a power rod 121. It also includes a presser foot lifting cam 32, a second transmission adjustment component 33, and a reset component 34. The presser foot lifting cam 32 is located at the output end of the power rod 121 and has the same structure as the needle pitch cam 13. The second transmission adjustment component 33 is located between the presser foot assembly 30 and the presser foot lifting cam 32. When the power rod 121 drives the presser foot lifting cam 32 to rotate, the second transmission adjustment component 33 drives the presser foot assembly 30 to move upward. The reset component 34 is located at the upper end of the presser foot assembly 30 and is used to reset the presser foot assembly 30.

[0044] The second transmission adjustment assembly 33 includes a guide plate connecting rod 35, a presser foot lifting guide plate 36, a presser foot lifting rear lever 37, a lever rod 38, a knee-controlled lifting lever 39, and a presser foot lifting frame 40. One end of the guide plate connecting rod 35 is hinged to the housing 60, and the other end is hinged to one end of the presser foot lifting guide plate 36. A bearing 41 is provided on the guide plate connecting rod 35, and the bearing 41 has the same structure as the bearing 20. The other end of the presser foot lifting guide plate 36 has an elongated hole 42. One end of the presser foot lifting rear lever 37 slides in the elongated hole 42. When the presser foot lifting cam 32 drives the guide plate connecting rod 35 to move around the hinge point 161, the presser foot lifting rear lever 37 slides in the elongated hole 42. The middle part of the presser foot lifting rear lever 37 is hinged. On the housing 60, one end is fixedly connected to one end of the lever rod 38, and the other end of the lever rod 38 is fixed to the knee-controlled lifting lever 39. The knee-controlled lifting lever 39 is hinged on the housing 60 and rotates around the hinge point 161. Its bottom is fixed to the presser foot lifting frame 40. A stud 44 is fixedly installed inside the housing 60. The presser foot lifting frame 40 has an elongated hole 43 and slides on the stud 44. The presser foot lifting frame 40 is slidably installed and fixedly connected to the presser foot assembly 30. Through the cooperation between the presser foot lifting cam 32 and the second transmission adjustment component 33, the presser foot assembly 30 is automatically lifted, thereby controlling the presser foot assembly 30 to lift and lower accurately and effortlessly. The presser foot assembly 30 is reset through the reset component 34.

[0045] The presser foot assembly 30 includes a presser rod 45, a pressure adjusting guide rod 46, and a presser foot 47. The presser foot 47 is located at the bottom of the presser rod 45, and a guide hole is also provided inside the presser rod 45. The pressure adjusting guide rod 46 is slidably disposed in the guide hole. The reset component 34 includes a pressure adjusting spring 48, which is sleeved on the pressure adjusting guide rod 46. By setting the pressure adjusting spring 48, when the toothed frame 10 drives the presser foot 47 to move upward, the presser foot 47 presses the toothed frame 10, thereby ensuring the stability of feeding and at the same time playing a reset role.

[0046] When the presser foot 47 needs to be lifted, the presser foot lifting cam 32 is driven to rotate by the power rod 121, so that its flange engages with the bearing 41 and drives the guide plate connecting rod 35 to hinge around the hinge point 161. At this time, the presser foot lifting guide plate 36 moves upward and drives the presser foot lifting lever 37 to rotate around the hinge point 161. At this time, the lever rod 38 pulls the knee control lifting lever 39 to rotate around the hinge point 161 and drives the presser foot lifting frame 40 to move upward. The presser foot lifting frame 40 pulls the pressure rod 45 to move upward and compresses the pressure adjusting spring 48. When the presser foot lifting cam 32 rotates, the pressure adjusting spring 48 drives the pressure rod 45 to move back.

[0047] Example 3:

[0048] A sewing machine, such as Figure 4 , 5 As shown in Figure 6, the machine includes a housing 60, a power source 12 which is a servo motor 61, and a stitch length cam 13 and a presser foot lifting cam 32, both of which are fixedly mounted on the power rod 121 at the output end of the servo motor 61. The flanges of the stitch length cam 13 and the presser foot lifting cam 32 are arranged in opposite directions. When the stitch length needs to be adjusted, the servo motor 61 drives the power rod 121 to rotate forward. At this time, the flange of the stitch length cam 13 cooperates with the bearing 20 to lift the stitch length connecting rod 16. The presser foot lifting cam 32 is rotatably connected to the bearing 41, preventing the presser foot lifting cam 32 from causing the second transmission adjustment component 33 to swing. When the presser foot 47 needs to be lifted, the servo motor 61 drives the power rod 121 to rotate in reverse. At this time, the flange of the stitch length cam 13 does not contact the bearing 20, thereby saving the cost and space of the servo motor 61, reducing the production cost of the sewing machine, and increasing the compactness of the sewing machine.

[0049] Of course, the above are just typical examples of this utility model. In addition, this utility model may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by this utility model.

Claims

1. A needle pitch adjustment mechanism, comprising a housing (60), a tooth holder (10), and a transmission shaft assembly (11), wherein the tooth holder (10) is hinged to the transmission rod assembly, characterized in that: It also includes a power source (12), a pin pitch cam (13), a follower (14), a transmission component (141), and a reset component (15). The output end of the power source (12) is provided with a power rod (121). The pin pitch cam (13) is provided on the power rod (121). The follower (14) is provided between the transmission component (141) and the pin pitch cam (13). When the power source (12) drives the pin pitch cam (13) to rotate, the pin pitch cam (13) drives the follower (14) to swing and causes the transmission component (141) to drive the transmission shaft assembly (11) to adjust the position of the tooth frame (10). The reset component (15) is provided on the side of the follower (14).

2. The needle spacing adjustment mechanism according to claim 1, characterized in that: The driven member (14) includes a needle pitch link (16), one end of which is hinged to the housing (60) and forms a hinge point (161), and the other end is fixedly connected to the transmission member (141) and forms a fixed point (162). The needle pitch link (16) is also provided with an abutment (142) that cooperates with the needle pitch cam (13). The abutment (142) is located between the hinge point (161) and the fixed point (162).

3. The needle spacing adjustment mechanism according to claim 2, characterized in that: The abutment (142) includes a bearing (20), and the side end of the pin cam (13) abuts against the side end of the bearing (20).

4. The needle spacing adjustment mechanism according to claim 2, characterized in that: The transmission component (141) includes a stitch pitch adjustment link (17), a connector (18), and a feed lever (19). The stitch pitch adjustment link (17) is fixed to the stitch pitch link (16). The connector (18) is hinged to the housing (60), with one end hinged to the stitch pitch adjustment link (17) and the other end fixed to the feed lever (19). The other end of the feed lever (19) is fixed to the transmission shaft assembly (11).

5. The needle spacing adjustment mechanism according to claim 4, characterized in that: The drive shaft assembly (11) includes a guide rod (23), a toothed crank (24), and a feed crank (25). The toothed crank (24) and the feed crank (25) are both fixedly sleeved on the guide rod (23). The feed swing rod (19) is hinged to the feed crank (25), and the toothed crank (24) is hinged to the toothed frame (10).

6. A presser foot lifting mechanism, comprising a presser foot assembly (30), including a housing (60) as described in claim 1 and a power source (12), wherein the output end of the power source (12) is provided with a power rod (121), characterized in that: It also includes a lifting foot cam (32), a second transmission adjustment component (33), and a reset component (34). The lifting foot cam (32) is mounted on the power rod (121). The second transmission adjustment component (33) is mounted between the presser foot assembly (30) and the lifting foot cam (32). When the power rod (121) drives the lifting foot cam (32) to rotate, the second transmission adjustment component (33) drives the presser foot assembly (30) to move upward. The reset component (34) is mounted on the upper end of the presser foot assembly (30) and is used to reset the presser foot assembly (30).

7. The pressure foot lifting mechanism according to claim 6, characterized in that: The second transmission adjustment assembly (33) includes a guide plate connecting rod (35), a presser foot lifting guide plate (36), a presser foot lifting rear lever (37), a lever pull rod (38), a knee control lifting lever (39), and a presser foot lifting frame (40). One end of the guide plate connecting rod (35) is hinged to the housing (60), and the other end is hinged to one end of the presser foot lifting guide plate (36). The other end of the presser foot lifting guide plate (36) has an elongated slot (42). The presser foot lifting rear lever (39) is... 7) One end slides in the long waist hole (42), the middle part of the lifting foot lever (37) is hinged on the housing (60), and the other end is fixedly connected to one end of the lever rod (38). The other end of the lever rod (38) is fixed to the knee control lifting lever (39). The knee control lifting lever (39) is hinged on the housing (60) and fixed to the foot lifting frame (40). The foot lifting frame (40) is slidably set and fixedly connected to the foot assembly (30).

8. A foot-lifting mechanism according to claim 6, characterized in that: The presser foot assembly (30) includes a presser rod (45), a pressure adjusting guide rod (46), and a presser foot (47). The presser foot (47) is located at the bottom of the presser rod (45). A guide hole is also provided in the presser rod (45). The pressure adjusting guide rod (46) is slidably located in the guide hole. The reset component (34) includes a pressure adjusting spring (48), which is sleeved on the pressure adjusting guide rod (46).

9. A sewing machine, comprising a housing (60), characterized in that: It also includes the stitch pitch adjustment mechanism as described in any one of claims 1-5 and the presser foot lifting (47) mechanism as described in any one of claims 6-8. The power source (12) includes a servo motor (61). The stitch pitch cam (13) and the presser foot lifting cam (32) are both fixedly mounted on the power rod (121). The flanges of the stitch pitch cam (13) and the presser foot lifting cam (32) are arranged in opposite directions.

10. A sewing machine according to claim 9, characterized in that: When the power source (12) drives the power rod (121) to rotate clockwise, the lifting foot cam (32) drives the guide plate connecting rod (35) to swing. When the power source (12) drives the power rod (121) to rotate counterclockwise, the needle pitch cam (13) drives the needle pitch connecting rod (16) to swing.

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