Presser foot height adjusting mechanism of sewing machine

Abstract

The presser foot height adjusting mechanism comprises a base, a machine body fixed to the upper surface of the base and a machine head arranged on the side wall of the machine body, a mounting block is fixed to the lower surface of the machine head, a lifting groove is formed in the bottom of the mounting block, and a first threaded rod is rotationally connected to the inner top wall of the lifting groove; the first threaded rod is sleeved with a lifting block in threaded connection with the first threaded rod, the lifting block is in sliding connection with the inner wall of the lifting groove, a presser foot body is arranged at the bottom of the lifting block, and a driving assembly used for driving the first threaded rod to rotate is installed on the installation block. A worker drives the first threaded rod to rotate through the driving assembly, the first threaded rod is in threaded connection with the lifting block, and the lifting block is in sliding connection with the lifting groove, so that the lifting block axially moves along the first threaded rod, and the height of the presser foot body arranged at the bottom of the lifting block is adjusted; the height of the presser foot of the sewing machine can be conveniently adjusted according to the thicknesses of different fabrics, and the fabric processing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a presser foot height adjustment mechanism of a sewing machine. Background Art

[0002] A sewing machine is a machine used to sew or interweave one or more layers of sewing materials. It uses one or more sewing threads to form one or more stitches on the sewing materials. The sewing machine can sew fabrics such as cotton, linen, silk, wool, and artificial fibers, as well as leather, plastic, and paper. It can create neat, beautiful, flat, and firm stitches, with fast sewing speed and easy operation.

[0003] With respect to the above-mentioned related technologies, the inventors believe that the following defects exist: when processing fabrics, the height of the presser foot of the sewing machine needs to be adjusted according to the thickness of different fabrics. When adjusting the presser foot of the sewing machine in the prior art, the decorative cover and the presser foot fixing screw need to be removed for adjustment. The operation is complicated and cumbersome, which affects the efficiency of fabric processing. Utility Model Content

[0004] In order to solve the above problem, the utility model provides a presser foot height adjustment mechanism for a sewing machine.

[0005] The above technical purpose of the utility model is achieved through the following technical solutions: a presser foot height adjustment mechanism of a sewing machine, comprising a base, a body fixed to the upper surface of the base, and a head arranged on the side wall of the body, a mounting block fixed to the lower surface of the head, a lifting groove is provided at the bottom of the mounting block, a first threaded rod is rotatably connected to the top wall of the lifting groove, a lifting block threadably connected to the first threaded rod is sleeved on the first threaded rod, the lifting block is slidably connected to the inner wall of the lifting groove, a presser foot body is provided at the bottom of the lifting block, and a driving component for driving the first threaded rod to rotate is installed on the mounting block.

[0006] By adopting the above technical solution, when it is necessary to adjust the height of the presser foot body, the staff drives the first threaded rod to rotate through the driving assembly. Since the first threaded rod is threadedly connected to the lifting block, and the lifting block is slidingly connected to the lifting groove, the lifting block moves axially along the first threaded rod, thereby adjusting the height of the presser foot body set at the bottom of the lifting block, which is convenient for adjusting the height of the sewing machine presser foot according to the thickness of different fabrics, thereby improving the efficiency of fabric processing.

[0007] Furthermore, the side wall of the mounting block is provided with a mounting opening connected to the lifting slot, and the driving assembly includes a vertical rod rotatably connected to the inner wall of the mounting opening, a driving gear fixedly mounted on the vertical rod, and a driven gear fixedly mounted on the first threaded rod and meshing with the driving gear.

[0008] By adopting the above technical solution, when the height of the pressing foot body needs to be adjusted, the staff only needs to rotate the driving gear. Since the driving gear is engaged with the driven gear, and the driven gear is fixedly sleeved on the first threaded rod, the first threaded rod rotates and drives the lifting block to rise and fall, which is convenient for adjusting the height of the pressing foot body.

[0009] Furthermore, a limiting assembly for limiting the position of the driving gear is installed on the mounting block, and the limiting assembly includes a fixed block fixed to the side wall of the mounting block, a second threaded rod penetrating the fixed block and threadedly connected, a limiting block rotatably connected to the upper end of the second threaded rod, and a rotating block fixed to the lower end of the second threaded rod.

[0010] By adopting the above technical solution, after adjusting the height of the pressing foot body, the staff needs to rotate the second threaded rod through the rotating block, so that the second threaded rod drives the limit block to move upward and press against the driving gear to limit the rotation of the driving gear, thereby reducing the probability of the driving gear rotating under the action of external force and causing the height of the pressing foot body to change.

[0011] Furthermore, a rubber sheet is fixed on the upper surface of the limit block.

[0012] By adopting the above technical solution, the rubber sheet is made of rubber material, and its surface has greater friction. The limit block cooperates with the driving gear and presses against the rubber sheet, thereby increasing the friction between the limit block and the driving gear and enhancing the limiting effect of the limit block on the driving gear.

[0013] Furthermore, the cross-sections of the lifting block and the lifting slot are both rectangular.

[0014] By adopting the above technical solution, the rectangular cross-section avoids the situation where the lifting block rotates with the first threaded rod, which is conducive to driving the lifting block to move up and down by rotating the threaded rod.

[0015] Furthermore, a sliding groove is provided on the inner wall of the lifting groove, and a sliding block is fixed on the side wall of the lifting block and is slidably connected to the sliding groove.

[0016] By adopting the above technical solution, the slider is slidably connected in the slide groove, which limits the moving range of the lifting block and prevents the lifting block from falling out of the lifting groove downward.

[0017] Furthermore, an installation groove is provided at the bottom of the lifting block, a mounting plate slidably connected to the mounting groove is provided in the mounting groove, a spring is provided in the mounting groove, the upper end of the spring is fixed to the top wall in the mounting groove, the lower end of the spring is fixed to the upper surface of the mounting plate, and the pressing foot body is arranged at the bottom of the mounting plate.

[0018] By adopting the above technical solution, the spring plays a buffering role, and the pressing foot body abuts against the cloth downward under the elastic force of the spring, reducing the wear of the pressing foot body on the cloth.

[0019] Furthermore, a thread groove is provided at the bottom of the mounting plate, and a third threaded rod threadably connected to the thread groove is fixed on the upper surface of the pressing foot body.

[0020] By adopting the above technical solution, the pressing foot body is threadedly connected to the mounting plate through the third threaded rod, so that the pressing foot body and the mounting plate are detachably connected, which is convenient for maintenance and replacement of the pressing foot body.

[0021] In summary, the utility model has the following beneficial effects:

[0022] 1. In the present application, when the height of the press foot body needs to be adjusted, the staff drives the first threaded rod to rotate through the driving assembly. Since the first threaded rod is threadedly connected to the lifting block, and the lifting block is slidably connected to the lifting groove, the lifting block moves axially along the first threaded rod, thereby adjusting the height of the press foot body arranged at the bottom of the lifting block, which is convenient for adjusting the height of the press foot of the sewing machine according to the thickness of different fabrics, thereby improving the efficiency of fabric processing;

[0023] 2. In this application, when the height of the pressing foot body needs to be adjusted, the staff only needs to rotate the driving gear. Since the driving gear is meshed with the driven gear, and the driven gear is fixedly sleeved on the first threaded rod, the first threaded rod rotates and drives the lifting block to rise and fall, which is convenient for adjusting the height of the pressing foot body;

[0024] 3. In the present application, after adjusting the height of the pressing foot body, the staff needs to rotate the second threaded rod through the rotating block so that the second threaded rod drives the limit block to move upward and press against the driving gear to limit the rotation of the driving gear, thereby reducing the probability of the driving gear rotating under the action of external force and causing the height of the pressing foot body to change. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0026] Figure 2 It is a schematic cross-sectional structure diagram of an embodiment of the utility model;

[0027] Figure 3 yes Figure 2 A magnified schematic diagram of center A.

[0028] In the figure: 1. base; 2. body; 3. head; 4. mounting block; 41. lifting slot; 411. slide slot; 42. mounting port; 5. first threaded rod; 6. lifting block; 61. mounting slot; 7. pressing foot body; 8. driving assembly; 81. vertical rod; 82. driving gear; 83. driven gear; 9. limiting assembly; 91. fixing block; 92. second threaded rod; 93. limiting block; 94. rotating block; 10. rubber sheet; 11. slider; 12. mounting plate; 121. threaded slot; 13. spring; 14. third threaded rod. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0030] like Figure 1-3 As shown, an embodiment of the present application discloses a presser foot height adjustment mechanism for a sewing machine, comprising a base 1, a body 2, a head 3, a mounting block 4, a first threaded rod 5, a lifting block 6, a presser foot body 7, a drive assembly 8 and a limit assembly 9.

[0031] The base 1 is a rectangular parallelepiped structure, and the base 1 is used to carry the sewing machine. The fuselage 2 is a fuselage 2 commonly used in the prior art and applicable to the present embodiment, and the fuselage 2 is fixed on the upper surface of the base 1. The head 3 is a head 3 commonly used in the prior art and applicable to the present embodiment, and the head 3 is arranged on the side wall of the fuselage 2. The mounting block 4 is a rectangular parallelepiped structure, and the mounting block 4 is fixed to the lower surface of the head 3. A lifting groove 41 is provided at the bottom of the mounting block 4, and a mounting port 42 connected to the lifting groove 41 is provided on the side wall of the mounting block 4. The first threaded rod 5 is a vertically arranged rod-shaped structure, and the first threaded rod 5 is rotatably connected to the top wall of the lifting groove 41. The lifting block 6 is a rectangular parallelepiped structure, and the lifting block 6 is sleeved on the first threaded rod 5 and threadedly connected to the first threaded rod 5, and the lifting block 6 is slidably connected to the inner wall of the lifting groove 41. The pressing foot body 7 is a pressing foot body 7 commonly used in the prior art and applicable to the present embodiment, and the pressing foot body 7 is arranged at the bottom of the lifting block 6.

[0032] The driving assembly 8 is mounted on the mounting block 4 and is used to drive the first threaded rod 5 to rotate. The driving assembly 8 includes a vertical rod 81, a driving gear 82 and a driven gear 83. The vertical rod 81 is a vertically arranged round rod-shaped structure, and the vertical rod 81 is rotatably connected to the inner wall of the mounting opening 42. The driving gear 82 is fixedly sleeved on the vertical rod 81, and the axis of the driving gear 82 coincides with the axis of the vertical rod 81. The driven gear 83 is fixedly sleeved on the first threaded rod 5, and the driven gear 83 is meshed with the driving gear 82, and the axis of the driven gear 83 coincides with the axis of the driving gear 82.

[0033] The limit assembly 9 is installed on the mounting block 4 and is used to limit the driving gear 82. The limit assembly 9 includes a fixed block 91, a second threaded rod 92, a limit block 93 and a rotating block 94. The fixed block 91 is a rectangular parallelepiped structure, and the fixed block 91 is fixed on the side wall of the mounting block 4. The second threaded rod 92 is a vertically arranged rod-shaped structure, and the second threaded rod 92 is penetrated and arranged on the fixed block 91 and is threadedly connected. The limit block 93 is a round block structure, and the limit block 93 is rotatably connected to the upper end of the second threaded rod 92, and the axis of the limit block 93 coincides with the axis of the second threaded rod 92. The rotating block 94 is a round block structure, and the rotating block 94 is fixed to the lower end of the second threaded rod 92, and the axis of the rotating block 94 coincides with the axis of the second threaded rod 92.

[0034] When it is necessary to adjust the height of the press foot body 7, the staff only needs to rotate the active gear 82. Since the active gear 82 is meshed with the driven gear 83, and the driven gear 83 is fixedly sleeved on the first threaded rod 5, the first threaded rod 5 is rotated. Since the first threaded rod 5 is threadedly connected to the lifting block 6, and the lifting block 6 is slidably connected to the lifting groove 41, the lifting block 6 is moved axially along the first threaded rod 5, thereby adjusting the height of the press foot body 7 set at the bottom of the lifting block 6, which is convenient for adjusting the height of the sewing machine presser foot according to the thickness of different fabrics, thereby improving the efficiency of fabric processing. After adjusting the height of the press foot body 7, the staff needs to rotate the second threaded rod 92 by the rotating block 94, so that the second threaded rod 92 drives the limit block 93 to move upward and press against the active gear 82, thereby limiting the rotation of the active gear 82, reducing the probability of the active gear 82 rotating under the action of external force and causing the height of the press foot body 7 to change.

[0035] In order to enhance the limiting effect of the limiting block 93 on the driving gear 82, a rubber sheet 10 is fixed to the upper surface of the limiting block 93. The rubber sheet 10 is made of rubber material and has a large friction force on its surface. The limiting block 93 cooperates with the driving gear 82 and presses against the rubber sheet 10, thereby increasing the friction force between the limiting block 93 and the driving gear 82, thereby enhancing the limiting effect of the limiting block 93 on the driving gear 82.

[0036] In order to facilitate the lifting block 6 to move up and down by rotating the threaded rod, the cross-section of the lifting block 6 and the cross-section of the lifting slot 41 are both rectangular. The rectangular cross-section avoids the situation where the lifting block 6 rotates with the first threaded rod 5, thereby facilitating the lifting block 6 to move up and down by rotating the threaded rod.

[0037] In order to prevent the lifting block 6 from falling off the lifting slot 41 downward, a sliding slot 411 is opened on the inner wall of the lifting slot 41, and a slider 11 slidingly connected to the sliding slot 411 is fixed on the side wall of the lifting block 6. The slider 11 is slidingly connected in the sliding slot 411, which limits the moving range of the lifting block 6, thereby preventing the lifting block 6 from falling off the lifting slot 41 downward.

[0038] In order to reduce the wear of the pressing foot body 7 on the fabric, a mounting groove 61 is provided at the bottom of the lifting block 6, and a mounting plate 12 slidingly connected to the mounting groove 61 is provided in the mounting groove 61. A spring 13 is provided in the mounting groove 61, and the upper end of the spring 13 is fixed to the top wall in the mounting groove 61, and the lower end of the spring 13 is fixed to the upper surface of the mounting plate 12. The pressing foot body 7 is arranged at the bottom of the mounting plate 12, and the spring 13 plays a buffering role. The pressing foot body 7 is downwardly contacted with the fabric under the elastic force of the spring 13, thereby reducing the wear of the pressing foot body 7 on the fabric.

[0039] In order to facilitate the maintenance and replacement of the press-fit body 7, a threaded groove 121 is opened at the bottom of the mounting plate 12, and a third threaded rod 14 threadedly connected to the threaded groove 121 is fixed on the upper surface of the press-fit body 7. The press-fit body 7 is threadedly connected to the mounting plate 12 through the third threaded rod 14, so that the press-fit body 7 and the mounting plate 12 are detachably connected, thereby facilitating the maintenance and replacement of the press-fit body 7.

[0040] The use principle of the presser foot height adjustment mechanism of a sewing machine in the present embodiment is as follows: when it is necessary to adjust the height of the presser foot body 7, the staff only needs to rotate the active gear 82. Since the active gear 82 is meshed with the driven gear 83, the driven gear 83 is fixedly sleeved on the first threaded rod 5, so that the first threaded rod 5 is rotated. Since the first threaded rod 5 is threadedly connected with the lifting block 6, and the lifting block 6 is slidably connected with the lifting groove 41, the lifting block 6 is axially moved along the first threaded rod 5, thereby adjusting the height of the presser foot body 7 set at the bottom of the lifting block 6, which is convenient for adjusting the height of the sewing machine presser foot according to the thickness of different fabrics, thereby improving the efficiency of fabric processing. After adjusting the height of the presser foot body 7, the staff needs to rotate the second threaded rod 92 by the rotating block 94, so that the second threaded rod 92 drives the limit block 93 to move upward and press against the active gear 82, thereby limiting the rotation of the active gear 82, and reducing the probability of the active gear 82 rotating under the action of external force to cause the height of the presser foot body 7 to change.

[0041] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A presser foot height adjustment mechanism for a sewing machine, comprising a base (1), a body (2) fixed to the upper surface of the base (1), and a head (3) arranged on the side wall of the body (2), wherein: A mounting block (4) is fixed on the lower surface of the machine head (3); a lifting groove (41) is provided at the bottom of the mounting block (4); a first threaded rod (5) is rotatably connected to the top wall of the lifting groove (41); a lifting block (6) threadedly connected to the first threaded rod (5) is sleeved on the first threaded rod (5); the lifting block (6) is slidably connected to the inner wall of the lifting groove (41); a pressing foot body (7) is provided at the bottom of the lifting block (6); and a driving component (8) for driving the first threaded rod (5) to rotate is installed on the mounting block (4).

2. The presser foot height adjustment mechanism of a sewing machine according to claim 1, characterized in that: The side wall of the mounting block (4) is provided with a mounting opening (42) which is in communication with the lifting groove (41); the driving assembly (8) comprises a vertical rod (81) rotatably connected to the inner wall of the mounting opening (42), a driving gear (82) fixedly sleeved on the vertical rod (81), and a driven gear (83) fixedly sleeved on the first threaded rod (5) and meshing with the driving gear (82).

3. The presser foot height adjustment mechanism of a sewing machine according to claim 2, characterized in that: A limiting assembly (9) for limiting the position of the driving gear (82) is mounted on the mounting block (4), the limiting assembly (9) comprising a fixing block (91) fixed to a side wall of the mounting block (4), a second threaded rod (92) penetrating the fixing block (91) and threadedly connected, a limiting block (93) rotatably connected to the upper end of the second threaded rod (92), and a rotating block (94) fixed to the lower end of the second threaded rod (92).

4. The presser foot height adjustment mechanism for a sewing machine according to claim 3, characterized in that: A rubber sheet (10) is fixed on the upper surface of the limiting block (93).

5. The presser foot height adjustment mechanism for a sewing machine according to claim 1, characterized in that: The cross-sections of the lifting block (6) and the lifting slot (41) are both rectangular.

6. The presser foot height adjustment mechanism of a sewing machine according to claim 5, characterized in that: The inner wall of the lifting groove (41) is provided with a sliding groove (411), and the side wall of the lifting block (6) is fixed with a sliding block (11) which is slidably connected to the sliding groove (411).

7. The presser foot height adjustment mechanism for a sewing machine according to claim 6, characterized in that: The bottom of the lifting block (6) is provided with a mounting groove (61), a mounting plate (12) slidably connected to the mounting groove (61) is arranged in the mounting groove (61), a spring (13) is arranged in the mounting groove (61), the upper end of the spring (13) is fixed to the top wall of the mounting groove (61), the lower end of the spring (13) is fixed to the upper surface of the mounting plate (12), and the pressing foot body (7) is arranged at the bottom of the mounting plate (12).

8. The presser foot height adjustment mechanism for a sewing machine according to claim 7, characterized in that: A thread groove (121) is provided at the bottom of the mounting plate (12), and a third threaded rod (14) threadably connected to the thread groove (121) is fixed on the upper surface of the pressing foot body (7).

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