Variable amplitude adjusting mechanism and fascia gun

Abstract

The utility model relates to the field of fascia guns, in particular to a variable amplitude adjusting mechanism and a fascia gun, which comprise a piston rod, a transmission arm and a rotatable eccentric wheel, one end of the transmission arm is hinged with the piston rod, the piston rod is slidably arranged, the eccentric wheel comprises an eccentric column and an adjusting slider, and the adjusting slider is slidably connected with the eccentric column. The eccentric column is hinged to the transmission arm; a motor output shaft of the motor assembly is connected with the input end of the eccentric wheel, the axis of the motor output shaft is parallel to the axis of the eccentric column, the sliding direction of the eccentric column is perpendicular to the axis direction of the motor output shaft, and at least part of the motor assembly is arranged in a sliding mode in the axis direction of the motor output shaft. Comprising a motor assembly driving mechanism connected with the motor assembly, and the motor assembly driving mechanism drives at least part of the motor assembly to move in the axis direction of the motor output shaft to drive the eccentric column to slide so as to adjust the distance between the motor output shaft and the eccentric column. The utility model is especially suitable for fascia gun products.

Description

Technical Field

[0001] This utility model relates to the field of fascia guns, and in particular to a variable amplitude adjustment mechanism and a fascia gun. Background Technology

[0002] A fascia gun, also known as a deep myofascial impactor, is a soft tissue massage tool that relaxes the body's soft tissues through high-frequency impacts. Existing fascia guns use a piston to drive the massage head in a linear reciprocating motion. The massage head contacts the body, generating high-frequency vibrations that penetrate deep into the muscles, reducing local tissue tension, relieving pain, and promoting blood circulation. With current fascia guns, users can choose the appropriate vibration depth for their individual needs. For example, professional athletes require a deeper vibration depth to relieve muscle tension after exercise. Ordinary consumers, especially beginners, should initially use a fascia gun with a shallower vibration depth and gradually increase the depth as needed. However, most fascia guns or muscle massagers on the market currently use a crank-slider mechanism and an eccentric wheel to drive the motor and convert it into the reciprocating motion of the massage head. Because the eccentricity of the eccentric wheel is fixed, the stroke of the fascia gun's reciprocating motion is also fixed, making it impossible to change the vibration amplitude and thus unable to meet the diverse needs of users.

[0003] Taking application CN117860552A as an example, it discloses a scheme for adjusting the amplitude of a fascia gun. The core mechanism for amplitude adjustment involves a slider sliding on an eccentric wheel, connected to the eccentric wheel via a wedge-shaped surface. The slider rotates, connecting to a connecting rod. By adjusting the slider's vertical movement, the wedge-shaped surface causes lateral movement between the eccentric wheel and the slider, altering the axis of the connecting rod and the motor axis, thus adjusting the eccentricity. Due to the limitations of its adjustment principle, this scheme requires a large internal layout space, specifically for the adjustment mechanism components. While some components can change position, others, such as the motor assembly, remain fixed. Given the increasing market demand for lightweight and compact designs, this existing adjustment mechanism is difficult to apply to some small and delicate fascia gun products. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a variable amplitude adjustment mechanism and fascia gun that allows at least a portion of the structure of the motor assembly to move directly along with the motor output shaft to achieve sliding amplitude adjustment, thereby reducing the required internal arrangement space.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: a variable amplitude adjustment mechanism, including a piston rod, a transmission arm, and a rotatable eccentric wheel. One end of the transmission arm is hinged to the piston rod, which is slidably arranged. The eccentric wheel includes an eccentric column and an adjusting slider, which is slidably connected to the eccentric column. The eccentric column is hinged to the transmission arm. A motor assembly is included, with its output shaft connected to the input end of the eccentric wheel. The axis of the motor output shaft is parallel to the axis of the eccentric column, and the sliding direction of the eccentric column is perpendicular to the axis of the motor output shaft. At least a portion of the motor assembly is slidably arranged along the axis of the motor output shaft. A motor assembly drive mechanism connected to the motor assembly is included, which drives at least a portion of the motor assembly to move along the axis of the motor output shaft, thereby driving the eccentric column to slide and adjust the distance between the motor output shaft and the eccentric column. In actual adjustment, the motor assembly is driven to move along the motor output shaft by the motor assembly drive mechanism, and the moving motor output shaft drives the eccentric column to slide laterally in a direction perpendicular to the motor output shaft. Since the distance between the motor output shaft and the eccentric column is the eccentricity, the lateral sliding of the eccentric column causes a change in the eccentricity, which in turn changes the sliding amplitude of the piston rod.

[0006] As one embodiment of the motor assembly drive mechanism, the following scheme can be selected: The motor assembly drive mechanism includes an adjustment knob and a threaded adjustment seat that is threadedly engaged with the adjustment knob. The threaded adjustment seat is connected to the bottom of the motor output shaft through an adjustment seat bearing, and the axis of the adjustment knob is coaxial with the axis of the motor output shaft. When the adjustment knob is rotated, due to the threaded engagement between the threaded adjustment seat and the adjustment knob, the relative position between the adjustment knob and the threaded adjustment seat will change as the rotation proceeds. The change in the position of the threaded adjustment seat will drive the motor assembly and the motor output shaft to change their positions, thereby achieving a change in eccentricity and ultimately, amplitude adjustment.

[0007] Furthermore, to ensure that the adjustment knob does not shift along the motor output shaft during rotation, thus improving the movement of the threaded adjustment seat, the following solution can be chosen: The fixed housing includes a groove on its inner wall, and the adjustment knob includes an annular boss. The annular boss is positioned around the axis of the adjustment knob on its outer peripheral wall, allowing the adjustment knob to rotatably mount within the groove of the fixed housing via the annular boss. The adjustment knob is constrained within the groove of the fixed housing throughout its rotation by the limiting effect of the annular boss, yet this fit still ensures the rotation of the adjustment knob, thereby guaranteeing stable movement of the threaded adjustment seat.

[0008] Based on the above scheme, to ensure more stable and reliable movement of the motor assembly during the reciprocating motion of the piston rod, the following scheme is preferred: The motor assembly includes a guide post mounted at the top, evenly distributed around the motor output shaft, with the axis of the guide post parallel to the axis of the motor output shaft. A compression spring is sleeved on the guide post. It also includes a fixed bracket, with the guide post slidably positioned within the guide hole of the fixed bracket. In practical use, amplitude adjustment may be performed while the piston rod is reciprocating. The cooperation between the guide post and the guide hole of the fixed bracket effectively reduces wobbling and vibration during adjustment and guides the motor assembly to move smoothly along the direction of the guide post. Furthermore, the compression spring, being in a compressed state, provides continuous external force support to the motor assembly. This external force balances the driving force from the adjustment knob, ensuring the motor assembly remains stable whether moving or stationary, eliminating vibration interference during piston rod operation.

[0009] As one embodiment for achieving eccentric column sliding, the following scheme can be selected: the eccentric column includes a first eccentric column, the adjusting slider includes a first adjusting slider, the output shaft of the first eccentric column is hinged to the transmission arm, and the first adjusting slider is disposed at the top of the motor output shaft; the first eccentric column includes a first eccentric column inclined surface, the first adjusting slider includes a first adjusting slider inclined surface, the first adjusting slider inclined surface is obliquely arranged to the motor output shaft, and the first adjusting slider inclined surface and the first eccentric column inclined surface slide together to drive the first eccentric column to slide along the axis perpendicular to the motor output shaft. When the motor assembly and the motor output shaft move, the top of the motor output shaft drives the first adjusting slider to move. Since the first adjusting slider inclined surface is obliquely arranged to the motor output shaft, the moving first adjusting slider drives the first eccentric column to slide along the axis perpendicular to the motor output shaft through the sliding engagement between the first adjusting slider inclined surface and the first eccentric column inclined surface, thereby realizing the change of eccentricity and the final amplitude adjustment.

[0010] Furthermore, the preferred embodiment includes a first eccentric column guide platform on both sides, a first adjusting slider guide platform on both sides, and an eccentric wheel with an eccentric seat. The eccentric seat includes a horizontally arranged first eccentric groove and a vertically arranged second eccentric groove. The first eccentric column guide platform slides in conjunction with the first eccentric groove, and the first adjusting slider guide platform slides in conjunction with the second eccentric groove. By establishing a relative sliding relationship between the eccentric seat, the first eccentric column, and the first adjusting slider, the sliding engagement between the first eccentric column guide platform and the first eccentric groove, and the sliding engagement between the first adjusting slider guide platform and the second eccentric groove, ensures that both the first eccentric column and the first adjusting slider are under controllable constraints during adjustment. This allows for eccentricity adjustment even during reciprocating motion of the mechanism.

[0011] As one embodiment of the motor assembly, the following scheme can be selected: The motor assembly includes a motor bracket, which has a first mounting cylinder and a second mounting cylinder with mutually perpendicular axes. A motor output shaft is rotatably mounted inside the first mounting cylinder, and the motor output shaft can slide relative to the first mounting cylinder. A piston rod is slidably disposed inside the second mounting cylinder. An outer rotor and a magnet integrated within the outer rotor are fixed on the motor output shaft. A coil assembly is sleeved on the first mounting cylinder. The upper end of the motor output shaft is connected to a motor assembly drive mechanism, and the lower end of the motor output shaft has a wedge-shaped surface that slides in cooperation with an eccentric column. In this scheme, the motor assembly is divided into a moving part and a fixed part. Specifically, the moving part includes the outer rotor and the magnet integrated within the outer rotor, which slide along the axial direction of the motor output shaft along with it. The fixed part includes the coil assembly and the first and second mounting cylinders of the motor bracket, and the positions of the coil assembly and the first and second mounting cylinders of the motor bracket are relatively fixed. This structure of the motor assembly can reduce the overall volume of the motor assembly, thereby further saving internal layout space.

[0012] As another embodiment of the motor assembly drive mechanism, the following scheme can be selected: The motor assembly drive mechanism includes a knob cover and a threaded slider that engages with the threaded sleeve on the knob cover. The threaded slider is connected to the top of the motor output shaft via a threaded bearing. The axis of the knob cover and the axis of the motor output shaft are coaxially arranged. A left limiting edge and a right limiting edge are respectively provided on both sides of the threaded slider, extending along the direction of the motor output shaft. The left limiting edge is slidably disposed in a slot in the fixed housing, and the right limiting edge is slidably disposed in a slot in the rear housing. In actual adjustment, the relative position between the knob cover and the threaded slider is changed by rotating the knob cover. Specifically, a left limiting edge and a right limiting edge are provided on both sides of the threaded slider, with the left limiting edge slidably disposed in a slot in the fixed housing and the right limiting edge slidably disposed in a slot in the rear housing. In practical use, the left and right limit edges can only move in the corresponding slot directions to prevent the threaded slider from rotating during the rotation of the knob cover. This ensures the threaded slider can only move upwards or downwards along the motor output shaft. This structure of the threaded slider allows for eccentricity adjustment during reciprocating motion.

[0013] Furthermore, as another embodiment for realizing the sliding of the eccentric column, the following scheme can be selected: the eccentric column includes a second eccentric column, the adjusting slider includes a second adjusting slider, and the output shaft of the second eccentric column is hinged to the transmission arm; the second eccentric column includes a second eccentric column inclined groove, which is obliquely arranged to the axis of the motor output shaft; the second adjusting slider includes a second adjusting slider slot, the direction of which is perpendicular to the motor output shaft; the bottom end of the motor output shaft passes through the second adjusting slider and slides in cooperation with the second eccentric column inclined groove to drive the second eccentric column to slide along the direction of the second adjusting slider slot. In this embodiment, the second adjusting slider restricts the movement direction of the second eccentric column through the second adjusting slider slot, while the bottom end of the motor output shaft passes through the second adjusting slider and directly drives the movement of the second eccentric column. Its driving principle is also achieved through the second eccentric column inclined groove, which is obliquely arranged to the axis of the motor output shaft. This structural design is more streamlined, eliminates the eccentric seat, and is more conducive to saving valuable internal layout space.

[0014] To ensure a more stable sliding fit between the components, the following preferred design is used: the cross-sectional shape of the second eccentric column inclined groove is T-shaped, and the motor output shaft is engaged within the second eccentric column inclined groove via the T-shaped inclined surface at the bottom; the cross-sectional shape of the second adjusting slider slot is T-shaped, and the second eccentric column is engaged within the second adjusting slider slot via a T-shaped boss on the side wall. Vibrations generated during the reciprocating motion of the mechanism may cause the sliding fit between the components to disintegrate. Therefore, by using a T-shaped second eccentric column inclined groove and a T-shaped second adjusting slider slot, stable operation of both the motor output shaft and the second eccentric column can be prevented, allowing for amplitude adjustment even during reciprocating motion.

[0015] When applying the above structure to a fascia gun product, the following solution can be selected: a guide ring is included, with the piston rod slidably disposed within the guide ring. During fascia gun massage, the motor assembly is driven by a motor drive mechanism to move along the motor output shaft, thereby driving the eccentric column to slide. This adjusts the distance between the motor output shaft and the eccentric column, i.e., the eccentricity, ultimately changing the sliding amplitude of the piston rod and thus adjusting the amplitude of the fascia gun.

[0016] The beneficial effects of this invention are as follows: By enabling the motor assembly to slide, the motor output shaft directly becomes the component driving the eccentric column to slide, thereby greatly simplifying related parts, reducing the required layout space, and indirectly saving valuable internal space. This allows for a more compact design of fascia gun products, significantly improving the user experience. This invention is particularly suitable for fascia gun products. Attached Figure Description

[0017] Figure 1This is an exploded view of a fascia gun when applied to a fascia gun product according to one embodiment of this utility model.

[0018] Figure 2 yes Figure 1 A schematic diagram of the eccentric seat, the first eccentric column, and the first adjusting slider in the embodiment.

[0019] Figure 3 yes Figure 1 In one embodiment, the motor output axis moves upward and drives the first eccentric column to move to the right, thus obtaining a schematic diagram of the minimum amplitude.

[0020] Figure 4 yes Figure 1 In one embodiment, the motor output shaft moves downward and drives the first eccentric column to move to the left, thus obtaining a schematic diagram of the maximum amplitude.

[0021] Figure 5 This is another embodiment of the present invention applied to a fascia gun product, in which the motor output shaft moves downward and drives the second eccentric column to move to the right, thereby obtaining the maximum amplitude.

[0022] Figure 6 yes Figure 5 A sectional view of the side.

[0023] Figure 7 yes Figure 5 When the embodiment is applied to the fascia gun product, the motor output axis moves upward and drives the second eccentric column to move to the left, thereby obtaining a schematic diagram of the minimum amplitude.

[0024] Figure 8 yes Figure 7 A sectional view of the side.

[0025] The components marked in the diagram are: fixed bracket 1, shock-absorbing guide sleeve 2, eccentric bearing 3, eccentric seat 4, first eccentric groove 41, second eccentric groove 42, first eccentric column 5, first eccentric column inclined surface 51, first eccentric column guide platform 52, output shaft 53, first adjusting slider 6, first adjusting slider inclined surface 61, first adjusting slider guide platform 62, motor assembly 7, motor output shaft 71, guide column 72, motor bracket 73, first mounting cylinder 731, second mounting cylinder 732, outer rotor 733, magnet 734, wire. Ring assembly 735, adjusting seat bearing 8, threaded adjusting seat 9, adjusting knob 10, transmission arm 11, piston rod 12, guide ring 13, fixed housing 14, motor bracket bearing 15, rear housing 16, second adjusting slider 17, second eccentric column 18, second eccentric column inclined groove 181, second adjusting slider slot 182, threaded bearing 19, threaded slider 20, left limiting edge 20A, right limiting edge 20B, threaded sleeve 21, threaded sleeve screw 22, knob cover 23, decorative top cover 24, knob cover screw 25. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] like Figures 1 to 4 The diagram illustrates an embodiment of a variable amplitude adjustment mechanism applied to a fascia gun. One end of the transmission arm 11 is hinged to the piston rod 12, which is slidably mounted on a guide ring 13, which is mounted on the fixed housing 14 of the fascia gun. The other end of the transmission arm 11 is rotatably connected to an output shaft 53, vertically positioned at the top of the first eccentric column 5. The distance between the output shaft 53 and the motor output shaft 71 of the motor assembly 7 is the eccentricity. By adjusting the eccentricity, the vibration amplitude of the piston rod 12 can be adjusted.

[0028] like Figure 2 , Figure 3 and Figure 4 As shown, the cooperation between the eccentric seat 4, the first eccentric column 5, and the first adjusting slider 6 is key to achieving eccentricity adjustment. An eccentric seat bearing 3 is fitted around the eccentric seat 4. Besides the output shaft 53 at the top, the first eccentric column 5 has first eccentric column guide platforms 52 on both sides, and a first eccentric column inclined surface 51 inside. The first eccentric column inclined surface 51 and the first adjusting slider inclined surface 61 at the top of the first adjusting slider 6 are in close contact and form a sliding fit, wherein the first adjusting slider inclined surface 61 is obliquely intersecting the motor output shaft 71. Inside the eccentric seat 4, a first eccentric groove 41 is provided horizontally, and a second eccentric groove 42 is provided vertically. The first eccentric column guide platform 52 is in sliding fit with the first eccentric groove 41, and the first adjusting slider guide platforms 62 on both sides of the first adjusting slider 6 are in sliding fit with the second eccentric groove 42.

[0029] like Figure 3 As shown, when the motor output shaft 71 moves upward, the top of the motor output shaft 71 drives the first adjusting slider inclined surface 61 to move upward along the second eccentric slide groove 42. The upward-moving first adjusting slider inclined surface 61 drives the first eccentric column 5 to move laterally to the right along the first eccentric slide groove 41 through the first eccentric column inclined surface 51. When the eccentric column 5 moves laterally to the right, the distance between the output shaft 53 of the eccentric column 5 and the motor output shaft 71 decreases, that is, the eccentricity decreases, thereby realizing the adjustment of the amplitude. When the first adjusting slider 6 moves upward to the limit position, the minimum value of the eccentricity is reached, at which time the amplitude of the fascia gun is the minimum.

[0030] Conversely, such as Figure 4As shown, when the motor output shaft 71 moves downward, the top of the motor output shaft 71 drives the first adjusting slider inclined surface 61 to move downward along the second eccentric slide groove 42. The downward movement of the first adjusting slider inclined surface 61 causes the high-speed rotating first eccentric column 5 to move laterally outward under the action of centrifugal force. Figure 4 The eccentric column 5 moves laterally to the left. When the eccentric column 5 moves laterally to the left, the distance between the output shaft 53 of the eccentric column 5 and the output shaft 71 of the motor increases, that is, the eccentricity increases, thereby realizing the adjustment of the amplitude. When the first adjusting slider 6 moves downward to the limit position, the maximum value of the eccentricity is reached, at which time the amplitude of the fascia gun is the largest.

[0031] As one embodiment of the structure for realizing the vertical movement of the motor assembly 7, such as Figure 1 , Figure 3 and Figure 4 As shown, the motor output shaft 71 of the motor assembly 7 is arranged vertically, and a guide post 72 is arranged vertically on the top of the motor assembly 7. A compression spring is sleeved on the guide post 72, and the direction of the guide post 72 is parallel to the direction of the motor output shaft 71. The guide post 72 extends upward, passes through the shock-absorbing guide sleeve 2, and is slidably disposed in the guide hole of the fixed bracket 1, which can be fixedly connected to the fixed housing 14. The guide post 72 guides the motor assembly 7 to move upward or downward along the direction of the motor output shaft 71, thereby driving the first adjusting slider 6 to move upward or downward. The compression spring can buffer the impact of vibration during operation on the motor assembly 7.

[0032] As one embodiment of the motor assembly drive mechanism for realizing the up-and-down movement of the drive motor assembly 7, such as Figure 1 , Figure 3 and Figure 4 As shown, the bottom of the motor output shaft 71 passes through the bottom plane of the motor assembly 7, and the bottom of the motor output shaft 71 is connected to the threaded adjusting seat 9 via an adjusting seat bearing 8. An adjusting knob 10 is fitted onto the threaded adjusting seat 9, and the adjusting knob 10 and the threaded adjusting seat 9 are threadedly connected. The inner wall of the fixed housing 14 has a groove, and the outer periphery of the adjusting knob 10 has an annular boss. The annular boss is positioned around the axis of the adjusting knob 10 on the outer peripheral wall of the adjusting knob 10, allowing the adjusting knob 10 to rotatably reside within the groove of the fixed housing 14 via the annular boss. The fit between the annular boss and the groove of the fixed housing 14 ensures that the adjusting knob 10 can only rotate around its rotation axis and cannot slide along the direction of the rotation axis. The rotating adjusting knob 10 causes the threaded adjusting seat 9, which is threadedly engaged with the adjusting knob 10, to move upwards or downwards. The moving threaded adjusting seat 9 then drives the motor assembly 7 to move upwards or downwards, thereby achieving the corresponding eccentricity adjustment.

[0033] like Figures 5 to 8The illustration shows another embodiment of the variable amplitude adjustment mechanism applied to a fascia gun. In this embodiment, similarly, one end of the transmission arm 11 is hinged to the piston rod 12, which is slidably mounted on the guide ring 13, which is mounted on the fixed housing 14 of the fascia gun. The other end of the transmission arm 11 is rotatably connected to the output shaft 53, which is vertically positioned on the second eccentric column 18. Preferably, the fixed housing 14 and the rear housing 16 can be joined together to form a complete housing structure.

[0034] exist Figure 5 and Figure 7 In the structure shown, the motor bracket 73 of the motor assembly 7 has a first mounting cylinder 731 and a second mounting cylinder 732 with mutually perpendicular axes. The motor output shaft 71 is rotatably mounted inside the first mounting cylinder 731, and the motor output shaft 71 can slide relative to the first mounting cylinder 731. The piston rod 12 is slidably disposed inside the second mounting cylinder 732. In actual manufacturing, both the first mounting cylinder 731 and the second mounting cylinder 732 are integrated onto the motor bracket 73, improving the integration of components and further compressing the internal space occupied by related components. An outer rotor 733 and a magnet 734 integrated within the outer rotor 733 are fixed on the motor output shaft 71. Corresponding to the magnet 734, a coil assembly 735 is sleeved on the first mounting cylinder 731. The upper end of the motor output shaft 71 is connected to the motor assembly drive mechanism, and the lower end of the motor output shaft 71 has a wedge-shaped surface that slides with an eccentric column. In actual driving, only a portion of the motor assembly 7 participates in the movement along the direction of the motor output shaft 71, while a portion remains relatively fixed. Since the outer rotor 733 and the magnet 734 integrated within the outer rotor 733 are fixedly connected to the motor output shaft 71, when the motor output shaft 71 moves up and down, the outer rotor 733 and the magnet 734 move up and down with the motor output shaft 71, while the positions of the coil assembly 735 and the first mounting cylinder 731 remain relatively fixed. The up-and-down moving motor output shaft 71 drives the eccentric column to slide through the wedge-shaped surface at the lower end of the motor output shaft 71.

[0035] As one embodiment for achieving the sliding of the eccentric column driven by the wedge-shaped surface of the motor output shaft 71, the bottom end of the motor output shaft 71 can be directly slidably engaged with the second eccentric column groove 181 of the second eccentric column 18. For example... Figures 5 to 8As shown, since the second eccentric column inclined groove 181 is obliquely arranged to the axis of the motor output shaft 71, the vertical movement of the motor output shaft 71 can be converted into the horizontal movement of the second eccentric column 18 through the second eccentric column inclined groove 181. Specifically, the second adjusting slider 17 includes a second adjusting slider slot 182, the direction of which is perpendicular to the motor output shaft 71. The bottom end of the motor output shaft 71 passes through the second adjusting slider 17 and slides in engagement with the second eccentric column inclined groove 181. The side wall of the second eccentric column 18 is provided with a T-shaped boss that slides in engagement with the second adjusting slider slot 182 of the second adjusting slider 17. That is, the second eccentric column 18 is engaged in the second adjusting slider slot 182 through the T-shaped boss on the side wall, thereby ensuring that the second eccentric column 18 slides along the direction of the second adjusting slider slot 182. Therefore, when the bottom end of the motor output shaft 71 drives the second eccentric column 18 to move, the up-and-down movement of the motor output shaft 71 can be converted into the left-and-right sliding of the second eccentric column 18 along the direction of the second adjusting slider slot 182. Given that the fascia gun generates high-frequency vibrations during operation, and considering the structural characteristics of this embodiment, a T-shaped structure can be used to enhance the stability of the fit between the structures at the corresponding sliding parts. Specifically, the cross-sectional shape of the second eccentric column groove 181 is T-shaped, and the motor output shaft 71 is engaged within the second eccentric column groove 181 via the T-shaped inclined surface at its bottom end; the cross-sectional shape of the second adjusting slider slot 182 is T-shaped, and the second eccentric column 18 is engaged within the second adjusting slider slot 182 via the T-shaped boss on its side wall.

[0036] In specific adjustments to the above embodiments, such as... Figure 5 and Figure 6 As shown, when the motor output shaft 71 moves downward, the motor output shaft 71 drives the second eccentric column 18 to move to the right through the sliding engagement between the T-shaped inclined surface at its bottom and the inclined groove 181 of the second eccentric column. During the movement, the second eccentric column 18, guided by the T-shaped boss on its side wall, moves parallel to the right along the second adjusting slider groove 182. At this point, the distance between the output shaft 53 of the second eccentric column 18 and the motor output shaft 71 increases, thus increasing the eccentricity and obtaining a larger amplitude. Conversely, as... Figure 7 and Figure 8 As shown, when the motor output shaft 71 moves upward, the second eccentric column 18 moves to the left parallel along the second adjusting slider groove 182, the eccentricity decreases, and the amplitude decreases.

[0037] Another embodiment of the motor assembly drive mechanism for realizing the up-and-down movement of the drive motor assembly 7 is as follows: Figures 5 to 8As shown, the top end of the motor output shaft 71 of the motor assembly 7 is rotatably engaged with the threaded slider 20 via a threaded bearing 19, and the threaded bearing 19 is fixed by a threaded sleeve screw 22 located at the top end of the motor output shaft 71. The threaded slider 20 and the threaded sleeve 21 are threadedly engaged. The threaded sleeve 21 is mounted on the knob cover 23 via a knob cover screw 25. A decorative top cover 24 is then provided on the knob cover 23 to cover the knob cover screw 25. The axis of the knob cover 23 is coaxial with the axis of the motor output shaft 71. Simultaneously, the threaded slider 20 has a left limiting edge 20A and a right limiting edge 20B on both sides. The left limiting edge 20A and the right limiting edge 20B extend along the direction of the motor output shaft 71. The left limiting edge 20A is slidably mounted in a slot in the fixed housing 14, and the right limiting edge 20B is slidably mounted in a slot in the rear housing 16. In actual use, rotating the knob cover 23 drives the threaded sleeve 21 to rotate synchronously, which in turn drives the threaded slider 20, which is threadedly engaged with the threaded sleeve 21, to move up or down. This, in turn, drives the motor output shaft 71 to move up or down, thereby adjusting the eccentricity and amplitude. The left limit edge 20A and the right limit edge 20B are respectively slidably set in their corresponding slots. Therefore, when the knob cover 23 is rotated, the threaded slider 20 will only move up or down and will not rotate around its own axis, ensuring the accuracy of amplitude adjustment.

Claims

1. A variable amplitude adjusting mechanism, comprising a piston rod (12), a transmission arm (11) and a rotatable eccentric wheel, one end of the transmission arm (11) being hinged to the piston rod (12), the piston rod (12) being slidingly arranged, the eccentric wheel comprising an eccentric column and an adjusting slider, the adjusting slider being slidingly connected between the eccentric column, the eccentric column being hinged to the transmission arm (11); comprising a motor assembly (7), a motor output shaft (71) of the motor assembly (7) being connected to an input end of the eccentric wheel, an axis of the motor output shaft (71) being parallel to an axis of the eccentric column, a sliding direction of the eccentric column being perpendicular to a direction of the axis of the motor output shaft (71), characterized in that: at least part of the motor assembly (7) is slidingly arranged along the direction of the axis of the motor output shaft (71); comprising a motor assembly driving mechanism connected to the motor assembly (7), the motor assembly driving mechanism driving at least part of the motor assembly (7) to move along the direction of the axis of the motor output shaft (71) to drive the eccentric column to slide, so as to adjust a distance between the motor output shaft (71) and the eccentric column. The motor assembly driving mechanism comprises an adjusting knob (10) and a threaded adjusting seat (9) threadedly matched with the adjusting knob (10), the threaded adjusting seat (9) being connected to a bottom of the motor output shaft (71) through an adjusting seat bearing (8), an axis of the adjusting knob (10) being coaxially arranged between the axis of the motor output shaft (71).

2. The variable amplitude adjustment mechanism of claim 1, wherein: The motor assembly (7) comprises a guide column (72) arranged at a top, the guide column (72) being uniformly arranged around the motor output shaft (71), the axis direction of the guide column (72) being parallel to the axis direction of the motor output shaft (71), the guide column (72) being sleeved with a compression spring; comprising a fixed support (1), the guide column (72) being slidingly arranged in a guide hole of the fixed support (1).

3. The variable amplitude adjustment mechanism of claim 2, wherein: The eccentric column comprises a first eccentric column (5), the adjusting slider comprises a first adjusting slider (6), an output shaft (53) of the first eccentric column (5) being hinged to the transmission arm (11), the first adjusting slider (6) being arranged at the top of the motor output shaft (71); 4. The variable amplitude adjustment mechanism of claim 3, wherein: The first eccentric column (5) comprises a first eccentric column inclined surface (51), the first adjusting slider (6) comprises a first adjusting slider inclined surface (61), the first adjusting slider inclined surface (61) being arranged obliquely to the motor output shaft (71), the first adjusting slider inclined surface (61) and the first eccentric column inclined surface (51) being slidingly matched to drive the first eccentric column (5) to slide along a direction perpendicular to the axis of the motor output shaft (71).

5. The variable amplitude adjustment mechanism of any one of claims 1 to 4, wherein: ​ ​ 6. The variable amplitude adjustment mechanism of claim 5, wherein: The first eccentric column (5) comprises first eccentric column guide tables (52) arranged on both sides, the first adjusting slider (6) comprises first adjusting slider guide tables (62) arranged on both sides, the eccentric wheel comprises an eccentric seat (4), the eccentric seat (4) comprises a first eccentric sliding groove (41) arranged horizontally and a second eccentric sliding groove (42) arranged vertically; the first eccentric column guide table (52) is in sliding fit with the first eccentric sliding groove (41), and the first adjusting slider guide table (62) is in sliding fit with the second eccentric sliding groove (42).

7. The variable amplitude adjustment mechanism of claim 1, wherein: The motor assembly (7) comprises a motor support (73) having a first mounting cylinder (731) and a second mounting cylinder (732) with axes perpendicular to each other, the motor output shaft (71) is rotatably arranged in the first mounting cylinder (731), and the motor output shaft (71) is slidable relative to the first mounting cylinder (731), and the piston rod (12) is arranged in the second mounting cylinder (732) in a sliding manner; The motor output shaft (71) is fixed with an outer rotor (733) and a magnetic steel (734) integrated in the outer rotor (733), and the first mounting cylinder (731) is sleeved with a coil assembly (735); The upper end of the motor output shaft (71) is connected with a motor assembly driving mechanism, and the lower end of the motor output shaft (71) is provided with a wedge surface in sliding fit with the eccentric column.

8. The variable amplitude adjustment mechanism of claim 7, wherein: The motor assembly driving mechanism comprises a knob cover (23) and a threaded block (20) in threaded fit with a threaded sleeve (21) on the knob cover (23), the threaded block (20) is connected with the top of the motor output shaft (71) through a threaded bearing (19), and the axis of the knob cover (23) is coaxially arranged with the axis of the motor output shaft (71); the left limiting edge (20A) and the right limiting edge (20B) are respectively arranged on the two sides of the threaded block (20), the left limiting edge (20A) and the right limiting edge (20B) are arranged in extension along the direction of the motor output shaft (71), the left limiting edge (20A) is arranged in sliding fit in the clamping groove of the fixed shell (14), and the right limiting edge (20B) is arranged in sliding fit in the clamping groove of the rear shell (16).

9. The variable amplitude adjustment mechanism of claim 8, wherein: The eccentric column comprises a second eccentric column (18), the adjusting slider comprises a second adjusting slider (17), and the output shaft (53) of the second eccentric column (18) is hinged with the transmission arm (11); The second eccentric column (18) comprises a second eccentric column inclined groove (181), the second eccentric column inclined groove (181) is arranged obliquely with the axis of the motor output shaft (71), the second adjusting slider (17) comprises a second adjusting slider clamping groove (182), the direction of the second adjusting slider clamping groove (182) is perpendicular to the motor output shaft (71), the bottom end of the motor output shaft (71) penetrates through the second adjusting slider (17) and is in sliding fit with the second eccentric column inclined groove (181) to drive the second eccentric column (18) to slide along the direction of the second adjusting slider clamping groove (182).

10. The variable amplitude adjustment mechanism of claim 9, wherein: The cross-sectional shape of the second eccentric column chute (181) is T-shaped, and the motor output shaft (71) is arranged in the second eccentric column chute (181) through the T-shaped slope at the bottom end.

11. A fascia gun comprising a guide ring (13), characterized in that: Further comprising the variable amplitude adjusting mechanism according to any one of claims 1-10, wherein the piston rod (12) is slidingly arranged in the guide ring (13).

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