Power-assisted knee rest structure and sewing machine
By designing the sensing components and reset components of Hall sensors and arc magnets in the sewing machine, the problems of poor signal accuracy and limited effective stroke of the existing sewing machine knee-rear knee structure are solved, and signal stability, flexibility in operation and improvement in working efficiency are achieved.
Patent Information
- Application Number
- CN202422155520.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-09-03
AI Technical Summary
When dealing with thicker fabrics, the positional relationship between the Hall sensor and the magnet assembly is unstable, resulting in poor signal accuracy, and the effective stroke of the swing rod assembly is limited, which is inconvenient to operate, which affects working efficiency.
A power-assisted knee structure is designed, and a sensing component of a Hall sensor and a curved magnet is used. Through the design of the arc magnet, the shortest distance from the arc surface to the Hall sensor remains unchanged to ensure the signal stability. At the same time, reset components and adjustment parts are added, expanding the effective stroke of the drive shaft and the range of knee-controlled resistance adjustment.
It improves the signal accuracy of the Hall sensor, expands the effective stroke of the knee-rest assembly, enhances the flexibility and work efficiency of operation, reduces noise, and realizes adaptive adjustment of knee-controlled resistance.
Smart Images
Figure CN223017142U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of sewing, and particularly to an assisting knee rest structure and a sewing machine. Background Art
[0002] The presser foot of a sewing machine plays a very important role in the process of sewing fabrics. When sewing relatively thick fabrics, the presser foot needs to be lifted by a small height at corners, when passing through thick or bumpy parts.
[0003] The common knee rest assembly structure with a Hall sensor on the market makes the magnet assembly generate displacement by touching the knee rest disc, thereby changing the electrical signal of the Hall sensor and finally realizing the lifting of the presser foot. However, when using the magnet assembly on the rotating shaft to cooperate with the Hall sensor to trigger the signal for lifting and lowering the presser foot, due to the unstable positional relationship between the Hall sensor and the magnet assembly, and the Hall sensor is also subjected to the pressure of the spring, the signal received by the Hall sensor has poor accuracy.
[0004] Moreover, in the prior art, the mechanical rotation angle of the swing rod assembly of the knee rest is usually only about 20°, and in order to avoid accidentally touching the knee rest disc and triggering the controller, an ineffective stroke is usually set for the displacement stroke of the swing rod assembly, which shortens the effective stroke of the swing rod assembly, resulting in a limited swing angle for the operator to perceive the effective stroke. As long as a little knee rest force is applied, the presser foot will be lifted to the highest point. Especially when sewing relatively thick fabrics, the maximum height that the presser foot can be lifted reaches 16 mm. If the presser foot presses on the fabric from the highest position, it is easy to cause problems such as fabric misalignment and unstable stitch, which cannot meet the needs of the operator, and affects work efficiency and generates a lot of noise. Summary of the Utility Model
[0005] Based on this, it is necessary to provide an assisting knee rest structure and a sewing machine.
[0006] An assisting knee rest structure includes a housing, a transmission shaft, an operating component, and a sensing component. The transmission shaft is rotatably installed in the housing. The operating component is connected to the transmission shaft for pushing the transmission shaft to rotate. The sensing component includes a Hall sensor and an arc-shaped magnet. The arc-shaped magnet is fixed on the periphery of the transmission shaft.
[0007] The Hall sensor is arranged on the housing and is located on the outer periphery of the circumference where the arc surface of the arc-shaped magnet is located, so that when the position of the arc-shaped magnet changes as the transmission shaft rotates, the shortest distance between the arc surface of the arc-shaped magnet and the Hall sensor remains unchanged.
[0008] In one embodiment, a partition part is provided in the housing. The partition part is provided with a first through hole, and the transmission shaft passes through the first through hole.
[0009] The drive shaft has a first end and a second end which are oppositely arranged. The first end and the second end respectively extend from both sides of the partition portion. The operation assembly is arranged at the first end of the drive shaft, the arc-shaped magnet is arranged at the second end of the drive shaft, and the Hall sensor and the arc-shaped magnet are located on the same side of the partition portion.
[0010] In one embodiment, the assist knee rest structure further includes a reset assembly. The reset assembly and the sensing assembly are respectively located on both sides of the partition portion. The reset assembly includes a reset elastic member, a guide shaft and a rocker arm.
[0011] The guide shaft is axially movably arranged on the partition portion.
[0012] One end of the rocker arm is fixed on the drive shaft, and the other end of the rocker arm abuts against the guide shaft for pushing the guide shaft to move.
[0013] The reset elastic member is connected to the guide shaft for resetting the guide shaft.
[0014] In one embodiment, a limit end is provided at one end of the guide shaft. The rocker arm abuts against the limit end. The reset elastic member is sleeved outside the guide shaft, and one end of the reset elastic member abuts against the limit end.
[0015] In one embodiment, the reset assembly further includes an adjusting member. The adjusting member is connected to the side surface of the housing. The adjusting member is provided with a limit hole. The end of the guide shaft away from the limit end is movably inserted into the limit hole, and the other end of the reset elastic member abuts against the adjusting member.
[0016] In one embodiment, a second through hole is provided on the side surface of the housing. The second through hole is a threaded hole. The adjusting member is provided with an external thread, and the adjusting member is connected to the second through hole through the external thread.
[0017] In one embodiment, a groove is provided on one side of the partition portion. The end of the guide shaft provided with the limit end is received in the groove.
[0018] The reset elastic member is received in the groove, and the reset elastic member does not contact the inner wall of the groove.
[0019] In one embodiment, a limiting portion is further provided on the partition portion. The limiting portion is located below the groove, and the limiting portion is used for limiting the rotation range of the rocker arm.
[0020] In one embodiment, a plane is provided on the side of the limit end facing the rocker arm, and the outer peripheral surface of the limit end is in sliding fit with the inner wall of the groove.
[0021] In one embodiment, the operating assembly includes an operating rod, an operating plate, a fastener, and a soft pad. The operating plate is connected to the operating rod through the fastener, and the soft pad is disposed on a side of the operating plate away from the operating rod.
[0022] In one embodiment, the sensing assembly further includes a magnet seat. The magnet seat is fixed to the second end of the transmission shaft, and the arc-shaped magnet is fixed to the second end through the magnet seat.
[0023] The present application also provides a sewing machine, including the assisting knee rest structure as described in any one of the above.
[0024] Compared with the prior art, the present utility model has the following advantages:
[0025] For the assisting knee rest structure provided by the present application, the sensing assembly used therein includes a Hall sensor and an arc-shaped magnet. By arranging the arc-shaped magnet, when the arc-shaped magnet changes its position as the transmission shaft rotates, the shortest distance between the arc surface of the arc-shaped magnet and the Hall sensor remains unchanged, that is, the relative signal receiving distance between the arc surface of the arc-shaped magnet and the Hall sensor remains unchanged, so that the signal received by the Hall sensor is always stable. Therefore, during the movement of the operating assembly, the signal received by the Hall sensor will not be affected. Moreover, due to the simple design of the assisting knee rest structure provided by the present application, the size of the assisting knee rest structure is reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0027] Figure 1 Schematic diagram of the assisting knee rest structure according to an embodiment of the present application;
[0028] Figure 2 Schematic diagram of the assisting knee rest structure from another angle according to an embodiment of the present application;
[0029] Figure 3 Exploded view of the assisting knee rest structure according to an embodiment of the present application;
[0030] Figure 4 Schematic diagram of the sensing assembly according to an embodiment of the present application;
[0031] Figure 5 Cross-sectional view of the housing according to an embodiment of the present application;
[0032] Figure 6 Schematic diagram of the groove in an embodiment of the present application;
[0033] Figure 7 Schematic diagram of the positional relationship between the adjusting member and the guiding shaft in an embodiment of the present application.
[0034] Reference numerals: 100, housing; 200, transmission shaft; 300, operating assembly; 400, sensing assembly; 500, reset assembly; 110, partition portion; 111, first through hole; 112, groove; 113, limiting portion; 120, second through hole; 310, operating rod; 320, operating plate; 330, fastener; 331, knuckle screw; 332, knuckle; 340, soft pad; 350, operating rod joint; 360, joint screw; 370, rubber pad; 410, Hall sensor; 420, arc magnet; 430, magnet seat; 440, fixing screw; 510, reset elastic member; 520, guiding shaft; 521, limiting end; 530, rocker arm; 540, adjusting member; 541, limiting hole; 550, locking screw. Detailed implementation manners
[0035] To make the above objects, features, and advantages of the present application more apparent and understandable, the following describes the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.
[0036] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or there can also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used in the description of the present application are only for the purpose of illustration and do not represent the only implementation manner.
[0037] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.
[0038] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature, or the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, the first feature being "above", "over" or "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" or "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.
[0039] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the related listed items.
[0040] This embodiment provides an assisting knee rest structure and a sewing machine that can ensure the signal accuracy of a Hall sensor.
[0041] Please refer to Figures 1 to 3 , this embodiment provides an assisting knee rest structure, including a housing 100, a transmission shaft 200, an operating component 300 and a sensing component 400. The transmission shaft 200 is rotatably installed in the housing 100. The operating component 300 is connected to the transmission shaft 200 to drive the transmission shaft 200 to rotate. The sensing component 400 includes a Hall sensor 410 and an arc magnet 420. The arc magnet 420 is fixed on the circumferential side of the transmission shaft 200. The Hall sensor 410 is arranged on the housing 100 and is located on the outer peripheral side of the circumference where the arc surface of the arc magnet 420 is located, so that when the position of the arc magnet 420 changes as the transmission shaft 200 rotates, the shortest distance between the arc surface of the arc magnet 420 and the Hall sensor 410 remains unchanged, as Figure 4 shown.
[0042] It can be understood that in the power-assisted knee rest structure provided in this embodiment, when it is necessary to use the power-assisted knee rest structure to lift the presser foot, the operator touches the operation component 300 to move. The operation component 300 makes a circular motion centered on the transmission shaft 200, and at the same time drives the transmission shaft 200 to rotate. Since the arc-shaped magnet 420 in the sensing component 400 is fixed on the transmission shaft 200, the arc-shaped magnet 420 changes its position along the circumferential direction of the transmission shaft 200 as the transmission shaft 200 rotates. The relative signal receiving distance between the arc surface of the arc-shaped magnet 420 and the Hall sensor 410 remains unchanged, so that the signal received by the Hall sensor 410 is always stable. Therefore, during the movement of the operation component 300, the transmission shaft 200, and the arc-shaped magnet 420, the signal received by the Hall sensor 410 will not be affected, ensuring the signal accuracy.
[0043] In one embodiment, the sensing component 400 further includes a magnet seat 430. The magnet seat 430 is fixed to the second end of the transmission shaft 200, and the arc-shaped magnet 420 is fixed to the second end through the magnet seat 430. Through the setting of the magnet seat 430, the distance between the arc-shaped magnet 420 and the rotating shaft is increased. The operation component 300 only needs to move a small distance to make the arc-shaped magnet 420 rotate a large arc length, improving the range of the signal received by the Hall sensor 410.
[0044] Furthermore, the housing 100 also has a card slot. The Hall sensor 410 is fixed at this card slot with glue to ensure that the relative distance from the arc-shaped magnet 420 is 2 mm - 5 mm. At the same time, the fixing screw 440 is used to fix the magnet seat 430 to the transmission shaft 200. When the transmission shaft 200 rotates, the arc-shaped magnet 420 on the magnet seat 430 is driven to rotate simultaneously, transmitting the signal to the Hall sensor 410.
[0045] In one embodiment, as Figure 5 shown, a partition portion 110 is provided inside the housing 100. The partition portion 110 is provided with a first through hole 111. The transmission shaft 200 passes through the first through hole 111. The transmission shaft 200 has a first end and a second end arranged oppositely. The first end and the second end respectively extend from both sides of the partition portion 110. The operation component 300 is arranged at the first end of the transmission shaft 200, the arc-shaped magnet 420 is arranged at the second end of the transmission shaft 200, and the Hall sensor 410 and the arc-shaped magnet 420 are located on the same side of the partition portion 110. In this way, by arranging the sensing component 400 and the operation component 300 on two sides of the partition portion 110, the sensing component 400 and the operation component 300 are isolated, so that the Hall sensor 410 will not be affected by the movement of the operation component 300 during the signal receiving process, further protecting the Hall sensor 410 from being affected by the outside when receiving the signal, thus solving the problem of poor signal accuracy.
[0046] In one embodiment, the assisting knee rest structure further includes a reset component 500. The reset component 500 and the sensing component 400 are respectively located on both sides of the partition portion 110. The reset component 500 includes a reset elastic member 510, a guide shaft 520, and a rocker arm 530. The guide shaft 520 is axially movably disposed on the partition portion 110. One end of the rocker arm 530 is fixed on the transmission shaft 200, and the other end of the rocker arm 530 directly abuts against the guide shaft 520 for pushing the guide shaft 520 to move. The reset elastic member 510 is connected to the guide shaft 520 for resetting the guide shaft 520. When the operating component 300 is subjected to a force applied by a user, the operating component 300 drives the rocker arm 530 to perform a circumferential motion around the axis of the transmission shaft 200 through the transmission shaft 200. When the guide shaft 520 moves, it will squeeze the reset elastic member 510, and the reset elastic member 510 generates a reaction force for resetting the guide shaft 520. With the cooperation of the rocker arm 530 and the reset elastic member 510, the guide shaft 520 can perform an axial reciprocating motion. Schematically, the reset elastic member 510 is a spring, and other alternative items can also be selected. It can be understood that along the direction of gravity, the housing 100 has a top surface and a bottom surface. The partition portion 110 and the side surface are both located between the top surface and the bottom surface, and the partition portion 110 and the side surface are both perpendicular to the top surface. In one embodiment, the side surface provides an abutting site for one end of the reset elastic member 510.
[0047] Further, a limiting end head 521 is provided at one end of the guide shaft 520. The rocker arm 530 abuts against the limiting end head 521. The reset elastic member 510 is sleeved outside the guide shaft 520, and one end of the reset elastic member 510 abuts against the limiting end head 521. It can be understood that the diameter of the limiting end head 521 is larger than the diameter of the reset elastic member 510, and the diameter of the reset elastic member 510 is larger than the diameter of the guide shaft 520, so that the limiting end head 521 can provide an abutting site for the reset elastic member 510. Schematically, a convex column is provided at the end of the rocker arm 530 in contact with the limiting end head 521, and the rocker arm 530 is lapped with the limiting end head 521 through the convex column for pushing the guide shaft 520.
[0048] In one embodiment, as Figure 7 shown, the reset component 500 further includes an adjusting member 540. The adjusting member 540 is connected to the side surface of the housing 100. The adjusting member 540 is provided with a limiting hole 541. The end of the guide shaft 520 away from the limiting end head 521 is movably inserted into the limiting hole 541, and the other end of the reset elastic member 510 abuts against the periphery of the limiting hole 541 of the adjusting member 540. In this way, the linear resistance in the assisting knee rest structure can be stabilized. Moreover, the guide shaft 520 can reciprocate in the limiting hole 541, increasing the effective stroke; the guide shaft 520 can also pass through the limiting hole 541 and penetrate out of the housing 100, saving the volume and manufacturing materials of the entire housing 100, thereby saving costs.
[0049] Further, a second through hole 120 is provided on the side surface of the housing 100. The second through hole 120 is a threaded hole, and the adjusting member 540 is provided with an external thread. The adjusting member 540 is connected to the second through hole 120 through the external thread. In this way, by rotating the adjusting member 540, the installation position of the adjusting member 540 at the second through hole 120 can be adjusted, so as to adjust the compression length of the reset elastic member 510, and further adjust the magnitude of the reset force provided by the reset elastic member 510 to the guide shaft 520, which enables the assisted knee rest structure to have the advantage that the knee control resistance can be adjusted.
[0050] Further, as Figure 6 shown, a groove 112 is provided on one side of the partition portion 110. One end of the guide shaft 520 provided with a limit end 521 is received in the groove 112; the reset elastic member 510 is received in the groove 112, and the reset elastic member 510 does not contact the inner wall of the groove 112. In this way, the groove 112 provides an installation space for the guide shaft 520 and the reset elastic member 510, making the assisted knee rest structure more compact, and enabling the guide shaft 520 and the reset elastic member 510 to avoid accidental injuries. At the same time, the reset elastic member 510 does not contact the inner wall of the groove 112, which can reduce the generation of noise.
[0051] Further, a limiting portion 113 is further provided on the partition portion 110. The limiting portion 113 is located below the groove 112, and the limiting portion 113 is used to limit the rotation range of the rocker arm 530. In this way, the movement range of the operation assembly 300 is limited. In one embodiment, the convex post on the rocker arm 530 is located in the groove 112, and the groove 112 limits the rotation range of the rocker arm 530 from the direction of the rocker arm 530's reset. The limitation of the rotation range of the rocker arm 530, on the one hand, avoids the situation that the assisted knee rest assembly shakes due to the movement of the operation assembly 300, and on the other hand, stabilizes the movement range of the arc-shaped magnet 420, avoiding the situation that the Hall sensor 410 cannot receive signals or the signals are abnormal due to too far a distance.
[0052] Further, a plane is provided on the side of the limit end 521 facing the rocker arm 530, and the outer peripheral surface of the limit end 521 is in sliding fit with the inner wall of the groove 112. By providing a plane on the plane of the limit end 521, the distance between the limit end 521 and the rocker arm 530 is reduced, and the gap between the rocker arm 530 and the partition portion 110 is also reduced, making the assisted knee rest structure more compact and smaller in volume.
[0053] In one embodiment, the operating component 300 includes an operating rod 310, an operating plate 320, a fastener 330, and a soft pad 340. The operating plate 320 is connected to the operating rod 310 by the fastener 330, and the soft pad 340 is disposed on the side of the operating plate 320 away from the operating rod 310. Further, the fastener 330 includes a socket head screw 331 and a socket 332. Further, the soft pad 340 can be loaded into the operating plate 320 by means of a groove 112, a buckle, etc. At the same time, the socket 332 and the operating plate 320 are fixed in the operating rod 310 using the socket head screw 331. The operating rod 310 and the transmission shaft 200 are fixed to the operating rod joint 350 using a joint screw 360. At the same time, the rocker arm 530 is fixed to the transmission shaft 200 using a lock screw 550. Further, a rubber pad 370 is also provided between the operating plate 320 and the operating rod 310. The rubber pad 370 plays a limiting role to prevent the phenomenon that the operating plate 320 is locked due to the socket head screw 331 being tightened too tightly. Finally, the force received by the soft pad is transmitted to the rocker arm 530, and then directly abuts against the limiting end 521 of the guide shaft 520 through the convex column of the rocker arm 530. The force is transmitted to the guide shaft 520 to cause the guide shaft 520 to make a position-changing movement that compresses the return elastic member 510. The return elastic member 510 generates a reaction force to restore itself to its original state, thereby pushing the guide shaft 520 to make a position-changing movement back to the position when it is not affected by the rocker arm 530. The combination of the rocker arm 530 and the return elastic member 510 enables the guide shaft 520 to perform a reciprocating movement within the groove 112.
[0054] In summary, the above embodiments can constrain the return elastic member 510 through the axial movement of the guide shaft 520, reduce noise, lengthen the effective stroke, and reduce the switch size. Increase the swing angle of the knee rest assembly, the signal induction of the Hall sensor 410 is stable, the knee rest force is adaptively adjustable, and the structure is simple.
[0055] This embodiment also provides a sewing machine, including the assist knee rest structure in any one of the above embodiments. When using the function of lifting and pressing the foot with the above assist knee rest structure, the advantage of adjustable knee rest force is retained. It not only improves the stability of Hall signal induction but also makes the knee rest force smoother.
[0056] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.
[0057] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the patent protection scope of the present application shall be subject to the appended claims.
Claims
1. A power-assisted knee support structure, characterized in that: The invention comprises a housing (100), a transmission shaft (200), an operating assembly (300) and a sensor assembly (400), wherein the transmission shaft (200) is rotatably mounted on the housing (100), and the operating assembly (300) is connected to the transmission shaft (200) to drive the transmission shaft (200) to rotate. The sensor assembly (400) comprises a Hall sensor (410) and an arc-shaped magnet (420), wherein the arc-shaped magnet (420) is fixed to the circumference of the transmission shaft (200). The Hall sensor (410) is arranged on the housing (100) and is located on the outer circumference of the circle where the arc surface of the arc-shaped magnet (420) is located, so that when the position of the arc-shaped magnet (420) changes with the rotation of the transmission shaft (200), the shortest distance between the arc surface of the arc-shaped magnet (420) and the Hall sensor (410) remains unchanged.
2. The power-assisted knee support structure according to claim 1, characterized in that: A partition (110) is provided in the housing (100), the partition (110) is provided with a first through hole (111), and the transmission shaft (200) is passed through the first through hole (111). The transmission shaft (200) has a first end and a second end that are arranged opposite to each other, the first end and the second end respectively extend from two sides of the partition (110), the operating component (300) is arranged at the first end of the transmission shaft (200), the arc-shaped magnet (420) is arranged at the second end of the transmission shaft (200), and the Hall sensor (410) and the arc-shaped magnet (420) are located on the same side of the partition (110).
3. The power-assisted knee support structure according to claim 2, characterized in that: The power-assisted knee support structure further comprises a reset assembly (500), wherein the reset assembly (500) and the sensor assembly (400) are respectively located on two sides of the partition (110), and the reset assembly (500) comprises a reset elastic member (510), a guide shaft (520) and a rocker arm (530). The guide shaft (520) is axially movable on the partition (110). One end of the rocker arm (530) is fixed on the transmission shaft (200), and the other end of the rocker arm (530) is in contact with the guide shaft (520) to push the guide shaft (520) to move. The resetting elastic member (510) is connected to the guide shaft (520) so as to be used for resetting the guide shaft (520).
4. The power-assisted knee support structure according to claim 3, characterized in that: A limiting end (521) is provided at one end of the guide shaft (520), the rocker arm (530) abuts against the limiting end (521), the reset elastic member (510) is sleeved on the outside of the guide shaft (520), and one end of the reset elastic member (510) abuts against the limiting end (521).
5. The power-assisted knee support structure according to claim 4, characterized in that: The reset assembly (500) further comprises an adjusting member (540), wherein the adjusting member (540) is connected to a side surface of the housing (100), and the adjusting member (540) is provided with a limiting hole (541), and one end of the guide shaft (520) away from the limiting end (521) is movably inserted into the limiting hole (541), and the other end of the reset elastic member (510) is abutted against the adjusting member (540).
6. The power-assisted knee support structure according to claim 5, characterized in that: A second through hole (120) is provided on the side of the housing (100); the second through hole (120) is a threaded hole; the adjusting member (540) is provided with an external thread; and the adjusting member (540) is connected to the second through hole (120) via the external thread.
7. The power-assisted knee support structure according to claim 6, characterized in that: A groove (112) is provided on one side of the partition portion (110), and one end of the guide shaft (520) provided with a limiting end (521) is received in the groove (112); The resetting elastic member (510) is received in the groove (112), and the resetting elastic member (510) does not contact the inner wall of the groove (112).
8. The power-assisted knee support structure according to claim 7, characterized in that: A limiting portion (113) is also provided on the partition portion (110), and the limiting portion (113) is located below the groove (112). The limiting portion (113) is used to limit the rotation range of the rocker arm (530).
9. The power-assisted knee support structure according to claim 7, characterized in that: A plane is provided on the side of the limiting end head (521) facing the rocker arm (530), and the outer peripheral surface of the limiting end head (521) is slidably matched with the inner wall of the groove (112).
10. The power-assisted knee support structure according to claim 1, characterized in that: The operating assembly (300) comprises an operating rod (310), an operating panel (320), a fastener (330) and a soft pad; the operating panel (320) is connected to the operating rod (310) via the fastener (330); and the soft pad is arranged on a side of the operating panel (320) away from the operating rod (310).
11. The power-assisted knee support structure according to claim 2, characterized in that: The sensor assembly (400) further comprises a magnet seat (430), wherein the magnet seat (430) is fixed to the second end of the transmission shaft (200), and the arc magnet (420) is fixed to the second end via the magnet seat (430).
12. A sewing machine, characterized in that: It comprises the power-assisted knee support structure as claimed in any one of claims 1 to 11.