A lifting device for a sewing machine presser foot

Abstract

This utility model discloses a lifting device for a sewing machine presser foot, including a drive mechanism, a transmission assembly, and a presser foot connecting component. The drive mechanism is located below the sewing machine, with its bottom engaging with the operator's thigh to convert the pushing action of the thigh into driving force. The transmission assembly has a rotatable shaft located at the bottom of the sewing machine on the side away from the presser foot. The top of the drive mechanism is connected to the first end of the transmission assembly, and the second end of the transmission assembly has the presser foot connecting component. When the drive mechanism is pushed along the length of the sewing machine, it rotates around the transmission assembly as its central axis, causing the presser foot connecting component to move up and down along the height of the sewing machine. This utility model's drive mechanism, located below the sewing machine and engaging with the thigh to convert the pushing action into driving force, drives the presser foot connecting component to rise and fall via the transmission assembly. This frees up the hands, has a compact structure, smooth transmission, and improves operational convenience and efficiency.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, and specifically to a lifting device for the presser foot of a sewing machine. Background Technology

[0002] In traditional sewing machine operation, the presser foot is typically raised manually or electrically. Manually raising the presser foot requires the operator to pause sewing and manually lift it, which is not only cumbersome and inefficient, but also prone to operator fatigue, affecting sewing quality. While electrically controlled presser foot raising increases automation, the equipment is more expensive and carries the risk of electrical malfunctions, resulting in higher maintenance costs. Therefore, there is an urgent need for a convenient, low-cost presser foot raising device that can improve sewing efficiency. Utility Model Content

[0003] Therefore, this utility model provides a lifting device for the presser foot of a sewing machine to solve the above-mentioned problems in the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] According to a first aspect of the present invention, a lifting device for a sewing machine presser foot includes:

[0006] Drive mechanism, transmission components, and pressure foot connecting parts;

[0007] The drive mechanism is located below the sewing machine, and its bottom engages with the operator's thigh to convert the pushing action of the thigh into driving force.

[0008] The transmission assembly is rotatably mounted on the bottom of the sewing machine on the side away from the presser foot;

[0009] The top of the drive mechanism is connected to the first end of the transmission assembly, and the second end of the transmission assembly is provided with the pressure foot connecting component;

[0010] When the drive mechanism is pushed along the length of the sewing machine, the drive mechanism rotates around the transmission assembly as the rotation center axis, driving the presser foot connecting component to move up and down along the height of the sewing machine.

[0011] Furthermore, the drive mechanism includes:

[0012] Push plate, first link, second link and third link;

[0013] The push plate is located at the bottom of the first connecting rod, with its inner side facing the outer side of the thigh.

[0014] The top of the first link is connected to the first end of the second link, the second end of the second link is connected to the first end of the third link, and the second end of the third link is detachably connected to the transmission assembly.

[0015] The axes of the first link, the second link, and the third link are perpendicular to each other.

[0016] Furthermore, the transmission assembly includes: a fourth link and a fifth link;

[0017] The fourth link is rotatably mounted on the bottom of the sewing machine, with its front end connected to the top of the drive mechanism and its rear end connected to the first end of the fifth link.

[0018] The second end of the fifth link is provided with a mounting hole, and the pressure foot connecting component is movably connected to the mounting hole.

[0019] The fourth link and the fifth link are arranged perpendicularly, and the angle between the planes in which they are located is an acute angle.

[0020] Furthermore, it also includes an angle adjustment device, disposed between the drive mechanism and the transmission assembly, for adjusting the relative position and angle between the two;

[0021] The angle adjustment device includes:

[0022] The block-shaped main body has a first and a second assembly hole that are perpendicular to each other on its side.

[0023] The first fastening bolt is threaded onto the top of the block body and communicates with the first assembly hole;

[0024] The second fastening bolt is threaded to the bottom of the block body and communicates with the second assembly hole;

[0025] The drive mechanism end is rotatably inserted through the first mounting hole and locked by the first fastening bolt; the transmission component end is rotatably inserted through the second mounting hole and locked by the second fastening bolt.

[0026] Furthermore, it also includes a height adjustment device, located between the push plate and the first connecting rod, for adjusting the relative height between the two;

[0027] The height adjustment device includes:

[0028] The slider has a through mounting hole two and a threaded hole that is perpendicularly connected to the mounting hole two;

[0029] The third fastening bolt is threaded into the threaded hole;

[0030] The first connecting rod passes through the second mounting hole and is locked in place by the third fastening bolt.

[0031] Furthermore, it also includes a tray, which is horizontally fixed to the bottom of the sewing machine;

[0032] The fourth link is located on the opposite side wall of the tray, and a limiting ring is provided at its end near the fifth link. The limiting ring is sleeved on the fifth link, and the limiting ring is located inside the tray and abuts against the inner wall of the tray.

[0033] Furthermore, the push plate is covered with a flexible outer sleeve, which is made of rubber.

[0034] This utility model has the following advantages:

[0035] This invention features a drive mechanism located below the sewing machine and engaging with the operator's thigh, converting the thigh's pushing motion into driving force. The operator no longer needs to use their hands to raise the presser foot; during sewing, the presser foot can be raised and lowered solely through the natural pushing motion of the thigh, allowing the hands to focus on fabric manipulation and significantly improving operational convenience and work efficiency.

[0036] The rotatable shaft of the transmission component is located at the bottom of the sewing machine on the side away from the presser foot, making full use of the unused space at the bottom of the sewing machine. It does not occupy the operating space above the table, making the overall structure of the sewing machine more compact. It expands the functions within a limited space, and also facilitates the storage and transportation of the sewing machine.

[0037] The top of the drive mechanism is connected to the first end of the transmission assembly, and the second end of the transmission assembly is equipped with a presser foot connecting component. When the drive mechanism is pushed along the length of the sewing machine, the presser foot connecting component moves up and down along the height direction with the transmission assembly as the rotation center axis. This transmission method, through stable shaft connection and structural design, reduces swaying and displacement during transmission, ensuring the smoothness and accuracy of the presser foot's lifting and lowering action, and avoiding sewing quality problems caused by unstable transmission.

[0038] This invention utilizes a thigh-driven mechanism to lift the presser foot, freeing up the operator's hands. Operators no longer need to pause sewing to manually lift the presser foot, significantly improving the convenience and efficiency of sewing operations. Compared to electrically controlled presser foot lifting methods, this invention features a simpler structure, reducing equipment costs and maintenance complexity. Attached Figure Description

[0039] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0040] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0041] Figure 1 A schematic diagram of a sewing machine presser foot lifting device provided for some embodiments of this utility model. Figure 1 .

[0042] Figure 2 A lifting device for a sewing machine presser foot is provided in some embodiments of this utility model. Figure 1 Enlarged view of part A.

[0043] Figure 3 A schematic diagram of a sewing machine presser foot lifting device provided for some embodiments of this utility model. Figure 2 .

[0044] Figure 4 A lifting device for a sewing machine presser foot is provided in some embodiments of this utility model. Figure 2 Enlarged view of part B.

[0045] Figure 5 A lifting device for a sewing machine presser foot is provided in some embodiments of this utility model. Figure 2 Enlarged view of part C.

[0046] Figure 6 This is a schematic diagram of an angle adjustment device for a sewing machine presser foot lifting device provided in some embodiments of the present invention.

[0047] Figure 7 A colored three-dimensional sewing machine presser foot lifting device provided for some embodiments of this utility model Figure 1 .

[0048] Figure 8 A colored three-dimensional sewing machine presser foot lifting device provided for some embodiments of this utility model Figure 2 .

[0049] Figure 9 A color front view of a sewing machine presser foot lifting device provided for some embodiments of this utility model.

[0050] In the picture:

[0051] 100. Drive mechanism;

[0052] 110. Push plate; 111. Flexible outer sleeve; 120. First connecting rod; 130. Second connecting rod; 140. Third connecting rod;

[0053] 200. Transmission assembly; 210. Fourth link; 211. Limiting ring; 220. Fifth link; 221. Mounting hole one;

[0054] 300. Presser foot connecting parts;

[0055] 400. Angle adjustment device; 410. Block-shaped main body; 411. First assembly hole; 412. Second assembly hole; 420. First fastening bolt; 430. Second fastening bolt;

[0056] 500. Height adjustment device; 510. Slider; 511. Mounting hole two; 512. Threaded hole; 520. Third fastening bolt;

[0057] 600. Pallet. Detailed Implementation

[0058] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0059] Example 1

[0060] like Figures 1 to 9 As shown, a sewing machine presser foot lifting device according to the first aspect embodiment of the present invention includes: a drive mechanism 100, a transmission component 200, and a presser foot connecting component 300.

[0061] The drive mechanism 100 is located below the sewing machine, and its bottom engages with the operator's thigh to convert the pushing action of the thigh into driving force, that is, the operator's thigh opens outward and abuts against the bottom of the drive mechanism 100.

[0062] The transmission assembly 200 has a rotatable shaft located at the bottom of the sewing machine on the side away from the presser foot. The transmission assembly is located at the bottom of the sewing machine, which does not occupy table space and makes operation more convenient.

[0063] The top of the drive mechanism 100 is connected to the first end of the transmission assembly 200. The second end of the transmission assembly 200 is provided with a presser foot connecting component 300, which is typically rod-shaped. The end of the presser foot connecting component 300 away from the transmission assembly is connected to the sewing machine presser foot. When the drive mechanism 100 is pushed along the length of the sewing machine, the drive mechanism 100 rotates around the transmission assembly 200 as its rotation center axis, driving the presser foot connecting component 300 to move up and down along the height of the sewing machine, thereby causing the sewing machine presser foot to perform lifting and lowering actions.

[0064] In use, the operator sits in front of the sewing machine, placing their thighs inside the pressure plate at the bottom of the drive mechanism. When it is necessary to raise the presser foot, the thigh applies a pushing force F towards the sewing machine, pushing the pressure plate. The drive mechanism moves along the length of the sewing machine, and through the transmission component, drives the presser foot connecting component to move upward along the height of the sewing machine, thus raising the presser foot. When the thigh is released, the presser foot descends and returns to its original position under the action of gravity or a return spring. This structure converts the pushing action of the thigh into the lifting and lowering power of the presser foot, freeing up the hands and eliminating the need for the operator to manually operate the presser foot during sewing, significantly improving work efficiency. It is especially suitable for sewing jobs that require frequent fabric changes or presser foot position adjustments.

[0065] Example 2

[0066] like Figures 1 to 9 As shown, a sewing machine presser foot lifting device includes all the contents of Embodiment 1, and the drive mechanism 100 includes:

[0067] The system comprises a pressure plate 110, a first connecting rod 120, a second connecting rod 130, and a third connecting rod 140. The pressure plate 110 is located at the bottom of the first connecting rod 120, with its inner side facing the outer side of the thigh. The pressure plate 110 is typically disc-shaped and covered with a flexible outer sleeve 111 made of rubber. The flexible rubber outer sleeve increases the comfort of the thigh in contact with the pressure plate and provides a certain amount of friction, preventing the thigh from slipping during the pressing process and ensuring operational stability. The operator's thigh directly contacts the flexible outer sleeve of the pressure plate 110, which acts as a buffer and anti-slip agent during the pressing process. The top of the first link 120 is connected to the first end of the second link 130, the second end of the second link 130 is connected to the first end of the third link 140, and the second end of the third link 140 is detachably connected to the transmission assembly 200. The axes of the first link 120, the second link 130, and the third link 140 are perpendicular to each other. Through the three mutually perpendicular link structures, the horizontal pushing motion of the thigh can be efficiently converted into vertical motion, ensuring the stability and accuracy of power transmission.

[0068] It should be noted that: when the pressure plate is pushed by the thigh, it drives the first linkage to move. Since the axes of the first, second, and third linkages are perpendicular to each other, the movement of the first linkage is transmitted to the second and third linkages in sequence, and finally the power is transmitted to the transmission component through the third linkage, realizing the raising and lowering of the pressure foot.

[0069] Example 3

[0070] like Figures 1 to 9 As shown, a lifting device for a sewing machine presser foot includes all the contents of Embodiment 2. The transmission assembly 200 includes: a fourth link 210 and a fifth link 220; the presser foot connecting component 300 and the fourth link 210 are arranged perpendicularly to each other. The fourth link 210 is rotatably mounted on the bottom of the sewing machine, with its front end connected to the top of the drive mechanism 100 and its rear end connected to the first end of the fifth link 220; the second end of the fifth link 220 is provided with a mounting hole 221, and the presser foot connecting component 300 is movably connected to the mounting hole 221; wherein, the fourth link 210 and the fifth link 220 are arranged perpendicularly, and the included angle between their planes is an acute angle, preferably 30-60 degrees.

[0071] It should be noted that when the drive mechanism rotates the fourth link, the rotation of the fourth link is transmitted to the presser foot connecting component through the fifth link. Since the fourth and fifth links are perpendicular and form an acute angle, the rotation of the fourth link causes a vertical displacement in the fifth link, thereby moving the presser foot connecting component up and down along the height of the sewing machine. The presser foot connecting component is movably connected to the fifth link through mounting hole one and can be adjusted as needed. The perpendicular arrangement of the fourth and fifth links, and the acute angle between their planes, effectively converts the horizontal driving force into a vertical lifting force, making the presser foot's movement smoother. Simultaneously, the movable connection design allows the presser foot to freely adjust its position within a certain range to adapt to different sewing needs.

[0072] Example 4

[0073] like Figures 1 to 9 As shown, a lifting device for a sewing machine presser foot includes all the contents of Embodiment 3, and also includes an angle adjustment device 400, which is disposed between the drive mechanism 100 and the transmission assembly 200 for adjusting the relative position and angle between the two; the angle adjustment device 400 includes: a block-shaped body 410, on the side of which a first mounting hole 411 and a second mounting hole 412 are perpendicular to each other; the first mounting hole 411 and the second mounting hole 412 are both through holes.

[0074] The first fastening bolt 420 is threadedly connected to the top of the block body 410 and communicates with the first mounting hole 411; the second fastening bolt 430 is threadedly connected to the bottom of the block body 410 and communicates with the second mounting hole 412; wherein, the end of the drive mechanism 100 is rotatably inserted through the first mounting hole 411 and locked by the first fastening bolt 420; the end of the transmission assembly 200 is rotatably inserted through the second mounting hole 412 and locked by the second fastening bolt 430.

[0075] The above should be noted as follows: Loosen the first and second fastening bolts, and allow the drive mechanism end and transmission component end to rotate within the first and second mounting holes respectively. After adjusting to a suitable angle, tighten the first and second fastening bolts to lock the drive mechanism and transmission component in the adjusted position. The angle adjustment device can adjust the relative position and angle of the drive mechanism and transmission component according to the operator's body characteristics and usage habits, making the operator more comfortable and reducing fatigue during use. Simultaneously, the locking function ensures the stability of the transmission during use.

[0076] Example 5

[0077] like Figures 1 to 9 As shown, a lifting device for a sewing machine presser foot includes all the contents of Embodiment 4, and further includes a height adjustment device 500, which is disposed between the push plate 110 and the first connecting rod 120 for adjusting the relative height between the two; the height adjustment device 500 includes: a slider 510, which has a through mounting hole 511 and a threaded hole 512 perpendicularly connected to the mounting hole 511; a third fastening bolt 520, which is threadedly connected to the threaded hole 512; wherein, the first connecting rod 120 passes through the mounting hole 511 and is locked by the third fastening bolt 520.

[0078] It should be noted that: loosening the third fastening bolt allows the slider to slide on the first connecting rod. After adjusting to a suitable height, tightening the third fastening bolt locks the slider on the first connecting rod, thus fixing the height of the push plate. The height adjustment device can adjust the height of the push plate according to the operator's height and sitting posture, ensuring the thighs are in a natural and comfortable position during the pushing process, improving operational comfort and efficiency.

[0079] Example 6

[0080] like Figures 1 to 9As shown, a lifting device for a sewing machine presser foot includes all the contents of Embodiment 5, and also includes a tray 600. The tray 600 has a groove in the middle and is horizontally fixed to the bottom of the sewing machine. Anti-slip pads (not shown in the figure) are evenly distributed on the bottom of the tray 600 to prevent the tray 600 from shifting. The fourth connecting rod 210 is located on the opposite side wall of the tray 600, and a limiting ring 211 is provided at its end near the fifth connecting rod 220. The limiting ring 211 is sleeved on the fifth connecting rod 220 and is located inside the tray 600 and abuts against the inner wall of the tray 600.

[0081] It should be noted that the fourth link rotates on the opposite side wall of the tray, and the limiting ring is sleeved on the fifth link and abuts against the inner wall of the tray. When the fourth link rotates, the limiting ring moves accordingly, but is restricted by the inner wall of the tray, thus ensuring that the rotation range of the fourth link is within a reasonable range.

[0082] The tray provides stable support and positioning for the transmission components. The limit ring restricts the rotation range of the fourth link, ensuring the stability and accuracy of the transmission process, preventing the transmission components from shaking or shifting during movement, and improving the accuracy of the presser foot lifting.

[0083] Through the above specific embodiments, the sewing machine presser foot lifting device of this utility model can effectively realize the function of lifting and lowering the presser foot by driving the thigh. It has the advantages of convenient operation, compact structure and low cost, and improves the efficiency and quality of sewing operations.

[0084] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

[0085] The terms "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Any changes or adjustments to their relative relationships, without substantially altering the technical content, shall also be considered within the scope of implementation of this utility model.

Claims

1. A lifting device for a sewing machine presser foot, characterized in that, include: Drive mechanism (100), transmission assembly (200), and pressure foot connecting component (300); The drive mechanism (100) is located below the sewing machine, and its bottom engages with the operator's thigh to convert the pushing action of the thigh into driving force. The transmission assembly (200) is rotatably mounted on the bottom of the sewing machine on the side away from the presser foot; The top of the drive mechanism (100) is connected to the first end of the transmission assembly (200), and the second end of the transmission assembly (200) is provided with the pressure foot connecting component (300); When the drive mechanism (100) is pushed along the length of the sewing machine, the drive mechanism (100) rotates around the transmission assembly (200) as the rotation center axis, driving the presser foot connecting component (300) to move up and down along the height of the sewing machine.

2. The lifting device according to claim 1, characterized in that, The drive mechanism (100) includes: Push plate (110), first link (120), second link (130) and third link (140); The push plate (110) is located at the bottom of the first connecting rod (120), with its inner side facing the outer side of the thigh; The top of the first link (120) is connected to the first end of the second link (130), the second end of the second link (130) is connected to the first end of the third link (140), and the second end of the third link (140) is detachably connected to the transmission assembly (200). The axes of the first link (120), the second link (130), and the third link (140) are perpendicular to each other.

3. The lifting device according to claim 1 or 2, characterized in that, The transmission assembly (200) includes: The fourth link (210) and the fifth link (220); The fourth link (210) is rotatably mounted on the bottom of the sewing machine, with its front end connected to the top of the drive mechanism (100) and its rear end connected to the first end of the fifth link (220); The second end of the fifth link (220) is provided with a mounting hole (221), and the presser foot connecting component (300) is movably connected to the mounting hole (221); The fourth link (210) and the fifth link (220) are arranged perpendicularly, and the angle between the planes in which they are located is an acute angle.

4. The lifting device according to claim 1, characterized in that, It also includes an angle adjustment device (400), which is disposed between the drive mechanism (100) and the transmission assembly (200) for adjusting the relative position and angle between the two. The angle adjustment device (400) includes: The block-shaped main body (410) has a first assembly hole (411) and a second assembly hole (412) that are perpendicular to each other on its side. The first fastening bolt (420) is threaded to the top of the block body (410) and communicates with the first assembly hole (411); The second fastening bolt (430) is threaded to the bottom of the block body (410) and communicates with the second assembly hole (412); The drive mechanism (100) is rotatably inserted through the first mounting hole (411) and locked by the first fastening bolt (420); the transmission assembly (200) is rotatably inserted through the second mounting hole (412) and locked by the second fastening bolt (430).

5. The lifting device according to claim 2, characterized in that, It also includes a height adjustment device (500), located between the push plate (110) and the first connecting rod (120), for adjusting the relative height between the two; The height adjustment device (500) includes: The slider (510) has a through mounting hole 2 (511) and a threaded hole (512) that is perpendicularly connected to the mounting hole 2 (511). The third fastening bolt (520) is threaded into the threaded hole (512); The first connecting rod (120) passes through the second mounting hole (511) and is locked by the third fastening bolt (520).

6. The lifting device according to claim 3, characterized in that, It also includes a tray (600), which is horizontally fixed to the bottom of the sewing machine; The fourth link (210) is mounted on the opposite side wall of the tray (600), and a limiting ring (211) is provided at its end near the fifth link (220). The limiting ring (211) is sleeved on the fifth link (220), and the limiting ring (211) is located inside the tray (600) and abuts against the inner wall of the tray (600).

7. The lifting device according to claim 2, characterized in that, The push plate (110) is covered with a flexible outer jacket (111), which is made of rubber.

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