Presser foot device for a sewing machine

Abstract

The application discloses a presser foot device of a sewing machine, and relates to the field of sewing machine accessories, which comprises a shell, a transmission part and a driving part, the shell is fixedly connected with a main body of the sewing machine, the transmission part is slidably arranged in the shell, the transmission part can compress a cloth to be sewn, the driving part is rotatably arranged on the shell, the driving part is engaged with the transmission part, and the driving part can drive the transmission part to move up and down; the application has the effect of improving the applicability of the sewing machine.

Description

Technical Field

[0001] This application relates to the field of sewing machine accessories, and in particular to a presser foot device for a sewing machine. Background Technology

[0002] Sewing machines are an important tool in garment production and are widely used in the processing of various textiles. When using a sewing machine, a presser foot is needed to hold the fabric in place to ensure the stability of the sewing process.

[0003] One type of sewing machine presser foot device consists of a presser foot plate and a presser foot rod. The presser foot plate is connected to the sewing machine body through the presser foot rod. When it is necessary to press the fabric, the presser foot plate is controlled to press the fabric by adjusting the lifting and lowering of the presser foot rod.

[0004] When using the above-mentioned sewing machine presser foot device, the adjustment range of the presser foot bar is small, which makes it impossible for the presser foot plate to effectively press thicker fabrics, thereby reducing the sewing efficiency of the sewing machine. Utility Model Content

[0005] To improve the versatility of sewing machines, this application provides a presser foot device for a sewing machine.

[0006] This application provides a presser foot device for a sewing machine, which adopts the following technical solution:

[0007] A presser foot device for a sewing machine, comprising:

[0008] The outer casing is fixedly connected to the sewing machine body;

[0009] A transmission component, which is slidably disposed inside the housing, is capable of pressing the fabric to be sewn;

[0010] A driving component is rotatably mounted on the housing, and the driving component meshes with the transmission component, thereby driving the transmission component to move up and down.

[0011] By adopting the above technical solution, when sewing fabric with a sewing machine, if the fabric is thin, place the fabric directly under the transmission component and rotate the drive component clockwise. The clockwise rotation of the drive component moves the transmission component closer to the fabric until it presses the fabric firmly. Then stop rotating the drive component. If sewing thicker fabric is required, and the fabric cannot be placed directly under the transmission component, rotate the drive component counterclockwise. The counterclockwise rotation of the drive component moves the transmission component away from the fabric until the fabric can be placed directly under the transmission component. Stop rotating the drive component counterclockwise and then rotate it clockwise, causing the transmission component to move closer to the fabric until it presses the fabric firmly. Through this adjustment method, the sewing machine can effectively press fabrics of different thicknesses, significantly improving its adaptability.

[0012] Optionally, the transmission component includes:

[0013] A transmission rod, which is slidably disposed within the housing;

[0014] A rack, which is fixedly mounted on one side of the transmission rod;

[0015] A pressure foot plate is fixedly installed at the bottom of the transmission rod.

[0016] By adopting the above technical solution, when it is necessary to compress thinner fabric, rotating the drive component clockwise causes the rack to move closer to the fabric due to its engagement with the rack. This movement of the rack then drives the transmission rod and presser foot to move synchronously until the presser foot presses the fabric firmly. When it is necessary to compress thicker fabric, rotating the drive component counterclockwise causes the rack to move away from the fabric. This movement of the rack then drives the transmission rod and presser foot to move synchronously until the fabric is positioned directly under the presser foot. Then, rotating the drive component clockwise again drives the presser foot to compress the thicker fabric. This allows for effective compression of fabrics of different thicknesses, thereby significantly improving the versatility of the sewing machine.

[0017] Optionally, the driving element includes:

[0018] A fixing plate is sleeved on the periphery of the outer shell and is fixedly disposed with the outer shell;

[0019] A drive gear, which is rotatably mounted on the fixed plate;

[0020] A fixed shaft is provided, and the drive gear is sleeved on the fixed shaft, and the drive gear is rotatably connected to the fixed shaft.

[0021] A helical rack is fixedly disposed on the side of the drive gear near the rack, and the housing is vertically provided with a transmission groove, through which the helical rack meshes with the rack;

[0022] A rocker arm is rotatably mounted on the side of the fixed shaft away from the helical rack, and the rotation axis of the rocker arm is consistent with the rotation axis of the drive gear.

[0023] A lever, one end of which is rotatably disposed around the rocker arm, and the other end of which meshes with the drive gear.

[0024] By adopting the above technical solution, when it is necessary to compress a thinner fabric, the lever is moved to the opposite direction of the rocker arm. At this time, the lever engages with the drive gear. Rotating the rocker arm clockwise causes the rocker arm to rotate, which in turn drives the lever to rotate clockwise. The drive gear then drives the helical rack to rotate clockwise. Since the rack and helical rack are engaged, the rotation of the helical rack drives the rack to move closer to the fabric. After the rack moves, it drives the transmission rod and the presser foot plate to move synchronously until the presser foot plate presses the fabric tightly, at which point the lever is stopped from being rotated. When pressing down thicker fabric, rotate the lever in the same direction as the rocker arm, and then rotate the rocker arm counterclockwise. The counterclockwise rotation of the rocker arm drives the lever to rotate counterclockwise, which in turn drives the drive gear to rotate counterclockwise. This drive gear, in turn, drives the helical rack to rotate counterclockwise. The counterclockwise rotation of the helical rack moves it away from the fabric, causing the transmission rod and presser foot to move synchronously until the fabric is directly under the presser foot. Stop rotating the rocker arm and then rotate it clockwise again to drive the presser foot to press down the fabric. This driving method effectively improves the convenience of using the presser foot to press down the fabric.

[0025] Optionally, a limit plate is fixedly provided at the end of the transmission rod away from the pressure foot plate.

[0026] By adopting the above technical solution, when the presser foot plate presses down on a thinner fabric, the lever is rotated in the opposite direction to the rocker arm. Rotating the rocker arm clockwise causes the lever to rotate clockwise, which in turn drives the drive gear to rotate clockwise. This rotation of the drive gear then drives the helical rack to rotate clockwise, which in turn drives the rack to move closer to the fabric. This movement of the rack then causes the transmission rod to move synchronously with the presser foot plate until the presser foot plate presses down on the fabric. During the movement of the transmission rod, the limiting plate prevents excessive movement and the transmission rod from detaching from the housing. The limiting plate effectively improves the stability of the transmission rod during movement.

[0027] Optionally, the bottom of the presser foot plate is provided with a horizontal rotating groove, and a roller is rotatably provided on the bottom of the presser foot plate, the roller being rotatably disposed within the rotating groove.

[0028] By adopting the above technical solution, after the presser foot plate presses the fabric, the sewing machine can be started to sew the fabric. During the sewing process, the sewing machine can drive the fabric to move smoothly. When the fabric moves, the rollers can reduce the friction between the fabric and the presser plate, thereby avoiding the fabric from getting stuck when moving, and thus effectively improving the stability of sewing the fabric.

[0029] Optionally, multiple rollers are spaced apart along the pressure foot plate.

[0030] By adopting the above technical solution, the arrangement of multiple rollers can further reduce the friction between the fabric and the presser foot, making the fabric more stable during movement, thereby further improving the stability of the fabric during movement.

[0031] Optionally, the lever is a U-shaped lever.

[0032] By adopting the above technical solution, the U-shaped lever design ensures that the lever will not jam with the drive gear when the rocker arm drives the lever to rotate, thereby improving the stability of the lever when it drives the drive gear to rotate.

[0033] Optionally, a guide slope is fixedly provided at the end of the lever that meshes with the helical gear.

[0034] By adopting the above technical solution, the guide slope ensures that the lever can mesh tightly with the drive gear, preventing slippage between the lever and the drive gear during rotation and thus preventing the lever from driving the drive gear to rotate. The guide slope effectively improves the stability of the lever during rotation.

[0035] Optionally, the fixing plate is inclined.

[0036] By adopting the above technical solution, the inclined fixing rod makes the rotation of the rocker arm and the drive gear more stable, preventing the outer shell from shaking when the drive gear rotates, which would cause deviation between the transmission rod and the presser foot plate, thus preventing the presser foot plate from accurately pressing the fabric. The inclined fixing rod effectively improves the stability of the presser foot plate when pressing the fabric.

[0037] In summary, the present invention provides a presser foot device for a sewing machine, which has at least one of the following beneficial technical effects:

[0038] 1. When sewing fabric with a sewing machine, if the fabric is thin, place it directly under the drive mechanism and rotate the drive mechanism clockwise. The clockwise rotation will move the drive mechanism closer to the fabric until it is pressed firmly against the material. Then stop rotating the drive mechanism. If sewing thicker fabric prevents it from being placed directly under the drive mechanism, rotate the drive mechanism counter-clockwise. This will move the drive mechanism away from the fabric until it is placed directly under the drive mechanism. Stop rotating the drive mechanism counter-clockwise and then rotate it clockwise to move the drive mechanism closer to the fabric until it is pressed firmly against the material. This adjustment method allows the sewing machine to effectively press fabrics of different thicknesses, significantly improving its adaptability.

[0039] 2. When pressing thinner fabrics, rotate the drive mechanism clockwise. Since the drive mechanism meshes with the rack, its rotation moves the rack closer to the fabric. This movement then drives the transmission rod and presser foot synchronously until the presser foot presses the fabric firmly. When pressing thicker fabrics, rotate the drive mechanism counter-clockwise. This rotation moves the rack away from the fabric, which in turn moves the transmission rod and presser foot synchronously until the fabric is directly under the presser foot. Then, rotate the drive mechanism clockwise to press the presser foot firmly onto the thicker fabric. This allows for effective pressing of fabrics of different thicknesses, thus significantly improving the versatility of the sewing machine.

[0040] 3. When it is necessary to press down a thinner fabric, move the lever to the opposite direction of the rocker arm. At this time, the lever engages with the drive gear. Turn the rocker arm clockwise. The rocker arm rotates, which in turn drives the lever to rotate. The lever rotates, which in turn drives the drive gear to rotate clockwise. The drive gear rotates clockwise, which in turn drives the helical rack to rotate clockwise. Since the rack and helical rack are engaged, the rotation of the helical rack drives the rack to move closer to the fabric. The movement of the rack drives the transmission rod and the presser foot plate to move synchronously until the presser foot plate presses down on the fabric. Then stop turning the lever. When pressing down thicker fabric, rotate the lever in the same direction as the rocker arm, and then rotate the rocker arm counterclockwise. The counterclockwise rotation of the rocker arm drives the lever to rotate counterclockwise, which in turn drives the drive gear to rotate counterclockwise. This drive gear, in turn, drives the helical rack to rotate counterclockwise. The counterclockwise rotation of the helical rack moves it away from the fabric, causing the transmission rod and presser foot to move synchronously until the fabric is directly under the presser foot. Stop rotating the rocker arm and then rotate it clockwise again to drive the presser foot to press down the fabric. This driving method effectively improves the convenience of using the presser foot to press down the fabric. Attached Figure Description

[0041] Figure 1A schematic diagram of the structure of a presser foot device for a sewing machine provided for an embodiment of this utility model;

[0042] Figure 2 A schematic diagram of the transmission component structure in the presser foot device of a sewing machine provided for an embodiment of this utility model;

[0043] Figure 3 A schematic diagram of the drive component structure in the presser foot device of a sewing machine provided for an embodiment of this utility model;

[0044] Figure 4 A schematic diagram of the rocker arm structure in the presser foot device of a sewing machine provided for an embodiment of this utility model;

[0045] Figure 5 This is a schematic diagram of the roller structure in the presser foot device of a sewing machine, provided as an embodiment of the present invention.

[0046] Explanation of the markings in the image:

[0047] 1. Outer shell; 11. Transmission groove; 2. Transmission component; 21. Transmission rod; 22. Rack; 23. Pressure foot plate; 24. Limiting plate; 3. Driving component; 31. Fixing plate; 32. Drive gear; 33. Fixing shaft; 34. Helical rack; 35. Rocker arm; 36. Pulley; 37. Guide slope; 4. Roller; 41. Rotating groove. Detailed Implementation

[0048] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0049] Combination Figure 1 and Figure 2 This application discloses a presser foot device for a sewing machine, including a housing 1, a transmission component 2, and a drive component 3. The housing 1 is fixedly connected to the main body of the sewing machine. The transmission component 2 is slidably disposed inside the housing 1 and can press the fabric to be sewn. The drive component 3 is rotatably disposed on the housing 1 and engages with the transmission component 2, and can drive the transmission component 2 to move up and down.

[0050] In this embodiment, the outer shell 1 has a rectangular structure and is fixedly connected to the sewing machine body by integral molding. The specifications of the transmission component 2 match the specifications of the outer shell 1.

[0051] In practical use, when sewing fabric with a sewing machine, if the fabric to be sewn is thin, place the fabric directly under the transmission component 2 and rotate the drive component 3 clockwise. The rotation of the drive component 3 will move the transmission component 2 closer to the fabric until it presses against the fabric, at which point you can stop rotating the drive component 3. If the fabric is thick and cannot be placed directly under the transmission component 2, rotate the drive component 3 counterclockwise. The counterclockwise rotation of the drive component 3 will move the transmission component 2 away from the fabric until it can be placed directly under the transmission component 2, at which point you can stop rotating the drive component 3. After placing a thicker piece of fabric directly under the transmission component 2, rotate the drive component 3 clockwise again. The clockwise rotation of the drive component 3 will move the transmission component 2 towards the fabric and press it against the fabric.

[0052] Combination Figure 2 , Figure 3 and Figure 4 In a specific embodiment, the transmission component 2 includes a transmission rod 21, a rack 22, and a pressure foot plate 23. The transmission rod 21 is slidably disposed inside the housing 1, the rack 22 is fixedly disposed on one side of the transmission rod 21, and the pressure foot plate 23 is fixedly disposed at the bottom of the transmission rod 21. The driving component 3 includes a fixed plate 31, a driving gear 32, a fixed shaft 33, a helical rack 34, a rocker arm 35, and a lever 36. The fixed plate 31 is sleeved around the periphery of the outer casing 1 and is fixedly installed to the outer casing 1. The driving gear 32 is rotatably mounted on the fixed plate 31 and sleeved on the fixed shaft 33, and the driving gear 32 is rotatably connected to the fixed shaft 33. The helical rack 34 is fixedly mounted on the side of the driving gear 32 near the rack 22. The outer casing 1 has a vertically provided transmission groove 11, through which the helical rack 34 meshes with the rack 22. The rocker arm 35 is rotatably mounted on the side of the fixed shaft 33 away from the helical rack 34, and the rotation axis of the rocker arm 35 is consistent with the rotation axis of the driving gear 32. One end of the lever 36 is rotatably mounted around the rocker arm 35, and the other end of the lever 36 meshes with the driving gear 32. A limit plate 24 is fixedly installed on the end of the transmission rod 21 away from the pressure foot plate 23. The lever 36 is a U-shaped rod. The end of the lever 36 that meshes with the helical gear is fixedly provided with a guide slope 37. The fixing plate 31 is inclined.

[0053] In this embodiment, the transmission rod 21 is a rectangular rod. The rack 22 can be integrally formed and fixedly connected to the transmission rod 21, or it can be connected by welding. No specific limitation is made in this embodiment. The pressure foot plate 23 is integrally formed and fixedly connected to the transmission rod 21. The fixing rod is fixedly connected to the outer casing 1 by bolts. The fixing shaft 33 is integrally formed and fixedly connected to the fixing rod. The helical rack 34 is integrally formed and fixedly connected to the drive gear 32. The transmission groove 11 is a rectangular groove, and the specifications of the transmission groove 11 match the specifications of the rack 22. The rocker arm 35 is a cylindrical rod. The limiting plate 24 is a rectangular plate. The limiting plate 24 can be integrally formed and fixedly connected to the transmission rod 21, or it can be connected by welding. No specific limitation is made in this embodiment. The guide slope 37 is an inclined surface.

[0054] In practical use, when it is necessary to compress a thinner fabric, move the lever 36 to the opposite direction of the rocker arm 35, and rotate the rocker arm 35 clockwise back and forth within a range of 30 degrees. When the rocker arm 35 rotates clockwise from 0 degrees to 30 degrees, the rocker arm 35 drives the lever 36 to rotate. At this time, the lever 36 meshes with the drive gear 32. After the lever 36 rotates, it drives the drive gear 32 to rotate clockwise. When lever 36 rotates counterclockwise from 30 degrees to 0 degrees, rocker arm 35 drives lever 36 to rotate counterclockwise. Since lever 36 disengages from drive gear 32 during counterclockwise rotation, it does not drive drive gear 32 to rotate counterclockwise. When rocker arm 35 returns to its initial position, lever 36 re-engages drive gear 32. Rotating rocker arm 35 clockwise again drives drive gear 32 to rotate clockwise, which in turn drives rack 34 to rotate clockwise. Since rack 34 meshes with rack 22, its clockwise rotation drives rack 22, which in turn moves transmission rod 21 and presser foot towards the fabric and presses it down. After transmission rod 21 moves a certain distance towards the fabric, limit plate 24 promptly contacts the inner wall of outer casing 1, preventing transmission rod 21 from detaching from casing 1 and causing transmission failure.

[0055] When it is necessary to compress a thicker fabric, move the lever 36 to the same direction as the rocker arm 35, and rotate the rocker arm 35 counterclockwise back and forth within a range of 30 degrees. When the rocker arm 35 rotates counterclockwise from 0 degrees to 30 degrees, the rocker arm 35 drives the lever 36 to rotate counterclockwise. At this time, the lever 36 is in a meshing state with the drive gear 32. Therefore, after the lever 36 rotates, it can drive the drive gear 32 to rotate counterclockwise. When the rocker arm 35 rotates counterclockwise from 30 degrees to 0 degrees, the rocker arm 35 drives the lever 36 to rotate counterclockwise. Since the lever 36 disengages from the drive gear 32 when it rotates clockwise, the lever 36 will not drive the drive gear 32 to rotate. When the rocker arm 35 drives the lever 36 back to the initial position, the lever 36 re-engages with the drive gear 32. At this time, the rocker arm 35 is rotated counterclockwise again. The rocker arm 35 rotates and drives the drive gear 32 to rotate counterclockwise. The drive gear 32 rotates counterclockwise and drives the helical rack 34 to rotate counterclockwise. Since the helical rack 34 meshes with the rack 22, the counterclockwise rotation of the helical rack 34 can drive the rack 22 to move the transmission rod 21 and the presser foot rod away from the fabric, so that the fabric can be placed directly under the presser foot plate 23. The inclined fixing rod can effectively improve the stability of the drive gear 32 when it rotates, and avoid the drive gear 32 from shaking when it rotates, which would cause the transmission rod 21 to rub against the inner wall of the outer casing 1 when it moves, thus affecting the transmission accuracy.

[0056] When the rocker arm 35 drives the lever 36 to rotate, the U-shaped lever 36 prevents it from jamming with the drive gear 32 as it rotates with the rocker arm 35. The guide slope 37 ensures that the lever 36 maintains a stable engagement with the drive gear 32 regardless of the direction of rotation.

[0057] Combination Figure 5 In a specific embodiment, a rotating groove 41 is horizontally provided at the bottom of the presser foot plate 23, and a roller 4 is rotatably provided at the bottom of the presser foot plate 23, the roller 4 being rotatably disposed within the rotating groove 41. Multiple rollers 4 are provided at intervals along the presser foot plate 23.

[0058] In this embodiment of the application, the rotating groove 41 is a rectangular groove, the roller 4 is a cylindrical structure, and the specifications of the roller 4 match the specifications of the rotating groove 41.

[0059] In practical use, after the presser foot 23 presses the fabric, the sewing machine can be started to sew the fabric. After the sewing machine is started, the fabric can be driven to move smoothly on the sewing machine. During the movement of the fabric, the roller 4 can convert the sliding friction between the fabric and the presser foot 23 into rolling friction, thereby reducing the friction force when the fabric moves and thus avoiding the situation of fabric jamming when sewing the fabric.

[0060] The principle of this embodiment is as follows: When sewing fabric with a sewing machine, if the fabric to be sewn is thin, place the fabric directly under the transmission component 2 and rotate the drive component 3 clockwise. The rotation of the drive component 3 drives the transmission component 2 to move closer to the fabric until the transmission component 2 presses the fabric firmly, at which point the rotation of the drive component 3 can be stopped. If the fabric is thick and cannot be placed directly under the transmission component 2, rotate the drive component 3 counterclockwise. The counterclockwise rotation of the drive component 3 drives the transmission component 2 to move away from the fabric until the fabric can be placed directly under the transmission component 2, at which point the rotation of the drive component 3 can be stopped. After a thicker piece of fabric is placed directly under the transmission component 2, rotating the drive component 3 clockwise again will cause the transmission component 2 to move towards the fabric and press it firmly.

[0061] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A presser foot device for a sewing machine, characterized in that, include: The outer casing (1) is fixedly connected to the sewing machine body; Transmission component (2), which is slidably disposed inside the outer shell (1), and can press the fabric to be sewn; The driving component (3) is rotatably mounted on the outer shell (1). The driving component (3) meshes with the transmission component (2). The driving component (3) can drive the transmission component (2) to move up and down.

2. The presser foot device for a sewing machine according to claim 1, characterized in that, The transmission component (2) includes: A transmission rod (21) is slidably disposed within the outer casing (1); A rack (22) is fixedly disposed on one side of the transmission rod (21); A pressure foot plate (23) is fixedly installed at the bottom of the transmission rod (21).

3. The presser foot device for a sewing machine according to claim 1, characterized in that, The driving component (3) includes: A fixing plate (31) is sleeved on the periphery of the outer shell (1), and the fixing plate (31) is fixedly disposed with the outer shell (1); A drive gear (32) is rotatably mounted on the fixed plate (31); A fixed shaft (33) is provided, and the drive gear (32) is sleeved on the fixed shaft (33). The drive gear (32) is rotatably connected to the fixed shaft (33). A helical rack (34) is fixedly disposed on the side of the drive gear (32) near the rack (22). The outer shell (1) is vertically provided with a transmission groove (11). The helical rack (34) meshes with the rack (22) through the transmission groove (11). A rocker arm (35) is rotatably disposed on the side of the fixed shaft (33) away from the helical rack (34), and the rotation axis of the rocker arm (35) is consistent with the rotation axis of the drive gear (32); A lever (36) is rotatably disposed on the periphery of the rocker arm (35), and the other end of the lever (36) meshes with the drive gear (32).

4. The presser foot device for a sewing machine according to claim 2, characterized in that, A limit plate (24) is fixedly provided at the end of the transmission rod (21) away from the pressure foot plate (23).

5. The presser foot device for a sewing machine according to claim 2, characterized in that, The bottom of the presser foot plate (23) is provided with a horizontal rotating groove (41), and a roller (4) is rotatably provided at the bottom of the presser foot plate (23), and the roller (4) is rotatably provided in the rotating groove (41).

6. The presser foot device for a sewing machine according to claim 5, characterized in that, The rollers (4) are arranged at intervals along the presser foot plate (23).

7. The presser foot device for a sewing machine according to claim 3, characterized in that, The lever (36) is a U-shaped lever.

8. The presser foot device for a sewing machine according to claim 3, characterized in that, The end of the lever (36) that meshes with the helical gear is fixedly provided with a guide slope (37).

9. The presser foot device for a sewing machine according to claim 3, characterized in that, The fixing plate (31) is set at an angle.

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