Fascia gun and linear reciprocating drive mechanism for fascia gun

Abstract

The present invention belongs to the field of massage equipment, and specifically discloses a linear reciprocating drive mechanism for a fascia gun, which aims to solve the problem that the existing linear reciprocating drive mechanism cannot adjust the amplitude. The linear reciprocating drive mechanism sets a guide post on the piston rod through an adjustment component, and opens at least two cam grooves with unequal transmission strokes on the cylindrical cam. Since the guide post is adapted to the cam groove and can extend into or out of the cam groove under the drive of the adjustment component, the working stroke of the piston rod can be changed by switching the cam grooves with different transmission strokes to cooperate with the guide post, thereby achieving amplitude adjustment, and the vibration generated by the linear reciprocating drive mechanism before and after the amplitude adjustment is very small. The present invention also discloses a fascia gun using the above-mentioned linear reciprocating drive mechanism, which can meet the customer's needs for different massage depths when massaging different positions, ensure the massage effect, and improve the user experience.

Description

Technical Field

[0001] The present invention belongs to the field of massage equipment, and in particular relates to a fascia gun and a linear reciprocating drive mechanism for the fascia gun. Background Art

[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 massage drive mechanism to drive a reciprocating linear motion of the massage head. The massage head contacts the body, generating high-frequency vibrations that act deep within the muscles, reducing local tissue tension, relieving pain, and promoting blood circulation.

[0003] Currently, to reduce the internal space occupied by the massage drive mechanism, a linear reciprocating drive mechanism is used as the massage drive mechanism of a fascia gun. For example, Chinese Utility Model Patent No. CN213588995U discloses a vertically rotating hook-connected transmission structure for a rotating member of a fascia gun. The structure comprises a motor disposed within the housing of the fascia gun, a rotating member coupled to the motor, and a transmission member constrained within the housing for reciprocating linear motion. The rotating member rotates about a rotation axis parallel to the direction of motion of the transmission member. The side edge of the rotating member is provided with an annular groove surrounding the rotation axis. The transmission member is provided with a coupling portion that is inserted into the annular groove. When the rotating member rotates, the coupling portion in the annular groove moves forward and backward along the rotation axis in at least two dynamic positions.

[0004] Although the vertical rotating hook of the rotating part of the above-mentioned fascia gun is connected to the transmission structure, the horizontal movement of the transmission part is driven by the rotating part, and the transmission part always moves in a linear manner. Therefore, the inner cavity of the shell where the transmission part is located does not require too much space, and the diameter of the shell can be simplified; however, its amplitude is determined by the two positions with the largest spacing in the annular groove, and cannot be changed by adjustment, resulting in the amplitude of the fascia gun being unadjustable. The striking distance of the massage head on the fascia gun is fixed. When the striking distance is large, hitting the position with fewer muscles will feel pain. When the striking distance is small, hitting the position with more muscles will not have much massage effect. Therefore, it is far from meeting the customer's demand for different amplitudes of the fascia gun when massaging different positions. Summary of the Invention

[0005] The present invention provides a linear reciprocating drive mechanism for a fascia gun, aiming to solve the problem that the existing linear reciprocating drive mechanism cannot adjust the amplitude.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a linear reciprocating drive mechanism for a fascia gun, comprising a drive assembly, a transmission assembly and a piston assembly, the drive assembly comprising a motor, the transmission assembly comprising a cylindrical cam mounted on the output end of the motor, the cylindrical cam being a component with a cam groove on a cylindrical surface, the cam groove being a curved groove surrounding the cylindrical cam, the length of the projection of the center line of the cam groove on the axis of the cylindrical cam being the transmission stroke, the piston assembly comprising a sleeve and a piston rod, the piston rod being nested in the sleeve and parallel to the axis of the cylindrical cam, the piston rod being connected to a guide column adapted to the cam groove; the guide column being arranged on the piston rod through an adjusting assembly, the adjusting assembly being capable of driving the guide column to extend into or out of the corresponding cam groove; the number of the cam grooves being at least two, wherein at least two cam grooves have different transmission strokes.

[0007] Furthermore, there are two cam grooves, and there are two guide posts, which correspond one to one with the two cam grooves; an adjustment groove is provided on the piston rod, and the adjustment assembly includes an adjustment gear rotatably arranged in the adjustment groove, and two guide posts are both arranged in the adjustment groove and are respectively located on the front and rear sides of the adjustment gear; both guide posts are provided with bar teeth, and are meshed with the adjustment gear through their respective bar teeth; when the adjustment gear rotates, the movement directions of the two guide posts are opposite; and when one of the guide posts extends into the corresponding cam groove, the other guide post withdraws from the corresponding cam groove.

[0008] Furthermore, a gear spindle is provided in the adjusting groove, and the adjusting gear is rotatably mounted on the gear spindle through a gear bushing.

[0009] Furthermore, the gear spindle is arranged along a direction perpendicular to the axis of the cylindrical cam.

[0010] Furthermore, the piston rod is provided with a self-locking structure capable of limiting the free rotation of the adjusting gear.

[0011] Furthermore, the self-locking structure includes a ball-type screw installed on the piston rod, and the adjusting ball of the ball-type screw is in the adjusting groove and is pressed against the side of the adjusting gear; the side of the adjusting gear corresponding to the ball-type screw is provided with a first ball-type groove and a second ball-type groove; when one of the guide columns extends into the corresponding cam groove, the adjusting ball of the ball-type screw is in the first ball-type groove; when the other guide column extends into the corresponding cam groove, the adjusting ball of the ball-type screw is in the second ball-type groove.

[0012] Furthermore, at least two bead grooves are provided on both side surfaces of the adjusting gear, and the first bead groove and the second bead groove are two bead grooves on one side surface of the adjusting gear.

[0013] Furthermore, the wave ball grooves on the same side of the adjusting gear are distributed in a circular array on the side where they are located, with the axis of the adjusting gear as the center of the circular array.

[0014] The present invention also provides a fascia gun, which includes a shell and a massage drive mechanism arranged in the shell, and the massage drive mechanism is the above-mentioned linear reciprocating drive mechanism for the fascia gun.

[0015] The present invention also provides another fascia gun, which includes a shell and a massage drive mechanism arranged in the shell, and the massage drive mechanism is the above-mentioned linear reciprocating drive mechanism for the fascia gun; the shell includes a main shell; the front end of the main shell is provided with a massage output hole, and the sliding sleeve is nested and installed at the massage output hole through a vibration damping ring.

[0016] Furthermore, the shell further includes a rear cover, and a drive mechanism loading port is provided at the rear end of the main shell, and the rear cover is detachably mounted on the drive mechanism loading port.

[0017] Furthermore, a battery assembly is included, which is detachably mounted on the lower part of the main shell.

[0018] Furthermore, a plug-in slot is provided at the lower part of the main shell, and a positioning hole is provided in the plug-in slot; a positioning column is provided at the upper end of the battery assembly, and the upper end of the battery assembly is inserted into the plug-in slot, positioned and matched with the positioning hole through the positioning column, and fixed together with the main shell through a connecting piece.

[0019] Furthermore, it also includes a control component, which is installed on the rear end of the rear cover; the motor and battery component are electrically connected to the control component respectively.

[0020] Furthermore, the drive assembly further includes a motor bracket, and the motor is fixedly mounted in the housing via the motor bracket.

[0021] Furthermore, the transmission assembly also includes a bearing seat with an end bearing, which is arranged in the housing and located on the front side of the motor. The front end of the cylindrical cam is cooperatively connected to the end bearing, and the rear end of the cylindrical cam is cooperatively connected to the output end of the motor.

[0022] Furthermore, the cross section of the output end of the motor is in a "D" shape; the rear end of the cylindrical cam is provided with a D-shaped hole, and is matched with the output end of the motor through the D-shaped hole.

[0023] Furthermore, the piston assembly also includes a piston anti-rotation structure capable of preventing the piston rod from rotating.

[0024] Furthermore, the piston anti-rotation structure includes an anti-rotation component arranged on the piston rod, and a guide structure is provided on the inner wall surface of the shell; the anti-rotation component and the guide structure are slidingly fitted together, and the travel range of the anti-rotation component is within the guide range of the guide structure.

[0025] Furthermore, the anti-rotation assembly includes a slide bearing, which is installed on the piston rod through a connecting piece; the guide structure is a guide groove, the slide bearing is placed in the guide groove, and the outer edge of the slide bearing can fit with the groove wall of the guide groove.

[0026] Furthermore, the anti-rotation assembly includes two slide bearings, which are symmetrically arranged on the piston rod; the guide structure includes two guide slots, which correspond one-to-one to the two slide bearings.

[0027] Furthermore, the adjustment component also includes a first button and a second button, and the first button and the second button are both movably mounted on the main shell; the first button can drive one of the guide columns to extend into the corresponding cam groove, and the outer end of the first button passes through the main shell and is exposed outside the shell; the second button can drive the other guide column to extend into the corresponding cam groove, and the outer end of the second button passes through the main shell and is exposed outside the shell.

[0028] Furthermore, the adjustment component also includes a button limiting structure.

[0029] Furthermore, the key limiting structure includes a key limiting block with a key groove; the key limiting block is arranged on the inner wall surface of the main shell, and the key groove and the inner wall surface of the main shell together form a key limiting cavity;

[0030] The inner end of the first button extends into the button limiting cavity and can pass through the bottom of the button groove. A first limiting portion is provided on the rod section of the first button in the button limiting cavity. A first return spring is sleeved on the first button. The first return spring is located between the first limiting portion and the bottom surface of the button groove.

[0031] The inner end of the second button extends into the button limiting cavity and can pass through the bottom of the button groove. The second button is provided with a second limiting portion on the rod section in the button limiting cavity, and a second return spring is mounted on the second button. The second return spring is located between the second limiting portion and the bottom surface of the button groove.

[0032] Furthermore, a vertical partition is provided in the key groove of the key limit block, and the vertical partition divides the key groove into a first key groove and a second key groove; the first key is in the first key groove, and the bottom of the first key groove is provided with a first through hole for the first key to pass through; the second key is in the second key groove, and the bottom of the second key groove is provided with a second through hole for the second key to pass through.

[0033] The beneficial effects of the present invention are:

[0034] 1) The linear reciprocating drive mechanism sets the guide post on the piston rod through the adjustment component, and opens at least two cam grooves with unequal transmission strokes on the cylindrical cam. Since the guide post is adapted to the cam groove and can extend into or out of the cam groove under the drive of the adjustment component, the cam grooves with different transmission strokes are switched to cooperate with the guide post to transmit the piston rod, thereby changing the working stroke of the piston rod and realizing the adjustment of the amplitude.

[0035] 2) A cylindrical cam is used for transmission, and the cam grooves with different transmission strokes are switched to cooperate with the guide column. The center of mass of the rotating transmission part of the transmission assembly changes very little. Therefore, the vibration generated by the linear reciprocating drive mechanism before and after amplitude adjustment is also very small. The contrast in use is extremely small, and the user can hardly feel the impact, ensuring the user experience.

[0036] 3) The fascia gun using the above-mentioned linear reciprocating drive mechanism can meet the customer's needs for different massage depths when massaging different positions, ensuring the massage effect and improving the user experience.

[0037] 4) The amplitude of the fascia gun can be adjusted by pressing a first button and a second button provided on the main shell, which is not only convenient for adjustment and control, but also has a significant difference in appearance from traditional fascia guns, making it easier for users to feel. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the implementation structure of the linear reciprocating drive mechanism provided by the present invention;

[0039] Figure 2 Schematic diagram of the structure of a cylindrical cam with two cam grooves in the present invention;

[0040] Figure 3 This is a three-dimensional exploded view of the fascia gun provided by the present invention;

[0041] Figure 4 This is a schematic diagram of the implementation structure of the adjustment gear in the present invention;

[0042] Figure 5 This is a rear view of the fascia gun provided by the present invention;

[0043] Figure 6 It is along Figure 5 Cross-sectional view along line AA;

[0044] Marked in the figure are: motor 110, motor bracket 120, cylindrical cam 210, cam groove 211, bearing seat 220, end bearing 221, sleeve 310, piston rod 320, adjusting groove 321, ball screw 322, slide bearing 330, guide column 410, bar tooth 411, adjusting gear 420, gear spindle 421, gear bushing 422, ball groove 423, first button 430, first limiting portion 431, first return spring 432, second button 440, second limiting portion 441, second return spring 442, button limiting block 450, shell 500, main shell 510, massage output hole 511, vibration damping ring 512, drive mechanism loading port 513, back cover 520, battery assembly 600, positioning column 610, control assembly 700. DETAILED DESCRIPTION

[0045] The present invention will be further described below with reference to the accompanying drawings.

[0046] In the description of the present invention, it should be noted that terms indicating directional relationships such as "front", "rear", "left", "right", "up", and "down" are all determined based on the direction in which the piston rod 320 extends as the front direction and the direction in which the piston rod 320 contracts as the rear direction during the movement of the piston rod 320. Knowing the front and back directions, it can be determined that the direction horizontally perpendicular to the front and back directions is the left and right direction, and the direction vertically perpendicular to the front and back directions is the up and down direction. The directions or positional relationships indicated by the terms "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. In addition, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0047] Combine Figure 1 and Figure 2 As shown, a linear reciprocating drive mechanism for a fascia gun includes a drive assembly, a transmission assembly, a piston assembly, and an adjustment assembly;

[0048] The drive assembly includes a motor 110;

[0049] The transmission assembly includes a cylindrical cam 210 mounted on the output end of the motor 110. The cylindrical cam 210 is a component having a cam groove 211 formed on a cylindrical surface. The cam groove 211 is a curved groove surrounding the cylindrical cam 210. The length of the projection of the center line of the cam groove 211 in the direction of the axis of the cylindrical cam 210 is the transmission stroke. The center line of the cam groove 211 is a line passing through the center point of the cross section of the cam groove 211, and its contour is the same as the trajectory line of the cam groove 211.

[0050] The piston assembly includes a sleeve 310 and a piston rod 320. The piston rod 320 is nested in the sleeve 310 and parallel to the axis of the cylindrical cam 210. The piston rod 320 is connected to a guide column 410 that is adapted to the cam groove 211. The piston rod 320 and the cylindrical cam 210 can be separated and arranged in an upper and lower manner, for example: Figure 1 In the embodiment, a yield structure is provided at the lower part of the rear half of the piston rod 320, and the cylindrical cam 210 is arranged at the lower side of the rear half of the piston rod 320; the piston rod 320 and the cylindrical cam 210 can also be coaxially nested, for example: a cam cavity is provided in the rear half of the piston rod 320, so that the column section of the cylindrical cam 210 having the cam groove 211 is embedded and installed in the cam cavity and maintains a clearance fit in the cam cavity; when the guide post 410 cooperates with the cam groove 211, it should be ensured that when the cam groove 211 rotates with the cylindrical cam 210, the guide post 410 can perform reciprocating linear motion under the guidance of the cam groove 211; the adaptation of the guide post 410 to the cam groove 211 means that the width of the guide post 410 is slightly smaller than the groove width of the cam groove 211. The two cannot be equal, otherwise the guide post 410 will have difficulty sliding relative to the cam groove 211 during operation. The difference between the two should not be too large, otherwise abnormal noise will be generated during operation. The specific matching dimensions are the existing technology well known to those skilled in the art and will not be repeated here.

[0051] The guide post 410 is disposed on the piston rod 320 via an adjustment assembly, which can drive the guide post 410 to extend into or out of the cam groove 211. The number of the cam grooves 211 is at least two, wherein at least two of the cam grooves 211 have different transmission strokes. That is, the multiple cam grooves 211 formed on the cylindrical cam 210 may also include cam grooves 211 with the same transmission stroke. However, in order to achieve amplitude adjustment, it is necessary to ensure that there are two or more cam grooves 211 with unequal transmission strokes. For example: Figure 1 and Figure 2 In the embodiment, the cylindrical cam 210 is provided with two cam grooves 211 with unequal transmission strokes;

[0052] The number of guide posts 410 may be one or more. When there is only one guide post 410, it can respectively extend into two or more cam grooves 211 with unequal transmission strokes. For example, two cam grooves 211 with unequal transmission strokes each have an extendable portion within the movement stroke of the guide post 410. For another example, when the guide post 410 is in the withdrawn state, the piston rod 320 is manually pushed and pulled to cause the guide post 410 to move along the axis direction of the cylindrical cam 210 and correspond to the cam groove 211 to be matched. When there are multiple guide posts 410, they can correspond one-to-one with each cam groove 211 with unequal transmission strokes, or one guide post 410 can correspond to multiple cam grooves 211. For example: Figure 1 In the embodiment, the two guide posts 410 correspond one to one with the two cam grooves 211 having unequal transmission strokes.

[0053] During the operation of the linear reciprocating drive mechanism, a guide post 410 extends into one of the cam grooves 211. The guide post 410 does not rotate during the rotation of the cylindrical cam 210. The guide post 410 only drives the piston rod 320 to perform reciprocating linear motion between the two farthest apart parts in the cam groove 211 under the guidance of the cam groove 211; when the cam groove 211 with different transmission strokes is switched to cooperate with the guide post 410 to transmit the piston rod 320, the working stroke of the piston rod 320 can be changed, thereby realizing the adjustment of the amplitude.

[0054] The drive assembly is the power source of the linear reciprocating drive mechanism, and generally includes a drive member and a fixing member for mounting the drive member. The motor 110 is a type of drive member, and various types of motors 110 can be selected, preferably a brushless motor. To facilitate the connection and effective transmission between the motor 110 and the cylindrical cam 210, the output end of the motor 110 is generally configured to have a variety of structures, such as a triangle, a quadrilateral, a prism, etc., or an anti-rotation structure is provided at the output end of the motor 110. Preferably, the output end of the motor 110 is configured to have a "D"-shaped cross-section. The motor 110 is generally mounted and fixed within the housing 500 of the fascia gun via a motor bracket 120. The motor bracket 120 is generally connected and fixed to the motor 110 by screws, and the bracket rod of the motor bracket 120 is generally fixed to the stud within the housing 500 by screws and vibration-damping washers.

[0055] The transmission assembly is the power transmission component of the linear reciprocating drive mechanism, which is mainly used to transmit the power output by the drive assembly to the piston rod 320. The transmission assembly generally includes a transmission member and a fixing member for mounting the transmission member. The cylindrical cam 210 is a type of transmission member. It is a component with a curved groove on the cylindrical surface. It can be regarded as the evolution of a moving cam rolled into a cylinder. The cam groove 211 is a curved groove provided on the cylindrical surface of the cylindrical cam 210. It is annular and has different depths in the axial direction of the cylindrical cam 210. By providing at least two cam grooves 211 with unequal transmission strokes, transmission can be achieved by switching the cam grooves 211 with unequal transmission strokes, thereby realizing the adjustment of the linear reciprocating drive mechanism. The cylindrical cam 210 can be directly mounted on the output end of the motor 110. In order to reduce its radial runout and axial movement, one end of it is generally rotatably mounted and supported by a bearing seat 220 with an end bearing 221.

[0056] The piston assembly is the moving component of the linear reciprocating drive mechanism, which is mainly used to drive the massage head to perform reciprocating linear motion to achieve the massage function; the piston assembly generally includes a piston rod 320, and a structure or component that limits the piston rod 320 so that it can only perform reciprocating linear motion, such as a sleeve 310; the sleeve 310 is a part that can slide with the piston rod 320, and is usually made of wear-resistant material, or a wear-resistant layer is provided on the sliding mating surface.

[0057] The adjustment assembly is the amplitude adjustment component of the linear reciprocating drive mechanism. It generally drives one or more guide pins 410. By engaging the guide pins 410 with cam grooves 211 of different transmission strokes, amplitude adjustment is achieved. For each cam groove 211 with different transmission strokes, only one corresponding guide pin 410 is engaged.

[0058] As a preferred embodiment of the present invention, Figure 1 and Figure 2As shown, there are two cam grooves 211, and there are two guide posts 410, which correspond one to one with the two cam grooves 211; an adjusting groove 321 is provided on the piston rod 320, and the adjusting assembly includes an adjusting gear 420 rotatably arranged in the adjusting groove 321, and two guide posts 410 are both arranged in the adjusting groove 321 and are respectively located on the front and rear sides of the adjusting gear 420; both guide posts 410 are provided with bar teeth 411, and are meshed with the adjusting gear 420 through their respective bar teeth 411; when the adjusting gear 420 rotates, the movement directions of the two guide posts 410 are opposite; and when one of the guide posts 410 extends into the corresponding cam groove 211, the other guide post 410 withdraws from the corresponding cam groove 211. The guide post 410 is usually only provided with bar teeth 411 on the upper part, and its lower part is a columnar structure, preferably a cylindrical structure; in this way, the guide post 410 is not a complete rack structure, and its movement will be forced to stop after reaching the preset position, which is convenient for control and avoids slipping.

[0059] In the above preferred embodiment, the transmission strokes of the two cam grooves 211 are L1 and L2 respectively, and L1>L2; a partition portion is usually provided in the adjustment groove 321, which divides its lower part into two front and rear column holes for assembling two guide posts 410; the bar teeth 411 of the two guide posts 410 respectively cooperate with the adjustment gear 420 one after the other, and the columnar portions of the two guide posts 410 respectively cooperate with the two column holes; moreover, when cooperated, one of the guide posts 410 is at the top of its stroke, and the other guide post 410 is at the bottom of its stroke and its columnar portion extends into the corresponding cam groove 211. When the amplitude needs to be adjusted, the guide post 410 that was originally in a high position is pressed down to extend it into the corresponding cam groove 211, and becomes the new guide post 410 in a low position. During the movement of the guide post 410, the adjusting gear 420 will drive the adjusting gear 420 to rotate, and then the adjusting gear 420 drives the guide post 410 that was originally in a low position to move upward, withdraw from the corresponding cam groove 211, and become the new guide post 410 in a high position. The cylindrical cam 210 and the above-mentioned adjustment component have a simple structure, are easy to install, and fit tightly. The transmission is stable during the adjustment process, the noise generated is small, and the bearing capacity is large and the service life is long. In order to facilitate the installation of the adjusting gear 420, as shown in the figure Figure 1 and Figure 3 As shown, a gear spindle 421 is disposed in the adjustment slot 321, and the adjustment gear 420 is rotatably mounted on the gear spindle 421 via a gear bushing 422. The mounting orientation of the gear spindle 421 determines the axial direction of the adjustment gear 420, ensuring that the gear spindle 421 is not parallel to the axis of the cylindrical cam 210. The gear bushing 422 is typically interference fit with the inner bore of the adjustment gear 420.

[0060] In order to fully utilize the transmission function of the adjusting gear 420 and reduce its size, it is preferred that the gear spindle 421 is arranged in a direction perpendicular to the axis of the cylindrical cam 210 .

[0061] Because massage vibrations are unavoidable during the operation of a fascia massage gun, a self-locking mechanism is typically provided on the piston rod 320 to prevent the adjustment gear 420 from accidentally rotating due to vibration or other factors after the guide post 410 is adjusted into position. This mechanism limits the free rotation of the adjustment gear 420. Free rotation refers to rotation of the adjustment gear 420 that occurs without human intervention. Various self-locking mechanisms can be used, such as damping mechanisms, ratchet mechanisms, worm gears, and elastic compression mechanisms.

[0062] Preferably, combined Figure 3 and Figure 4 As shown, the self-locking structure includes a ball-type screw 322 mounted on the piston rod 320, and the adjusting ball of the ball-type screw 322 is in the adjusting groove 321 and is pressed against the side of the adjusting gear 420; a first ball-type groove and a second ball-type groove are provided on the side of the adjusting gear 420 corresponding to the ball-type screw 322; when one of the guide columns 410 extends into the corresponding cam groove 211, the adjusting ball of the ball-type screw 322 is in the first ball-type groove; when the other guide column 410 extends into the corresponding cam groove 211, the adjusting ball of the ball-type screw 322 is in the second ball-type groove. The self-locking structure achieves locking by embedding the adjusting ball of the ball screw 322 into the first ball groove or the second ball groove. It is not a locked structure. The locking force can be controlled by adjusting the depth of the installation of the ball screw 322. It has the advantages of simple structure, easy adjustment of the tightening force, ease of use, and good locking effect. When the amplitude needs to be adjusted, a force is applied to the guide column 410 that was originally in a high position to overcome the binding force of the first ball groove or the second ball groove on the adjusting ball, so that the adjusting gear 420 can be rotated.

[0063] To facilitate installation of the adjustment gear 420, at least two bead grooves 423 are typically provided on both sides of the adjustment gear 420. The first bead groove and the second bead groove are two bead grooves 423 on one side of the adjustment gear 420. This allows workers to install the adjustment gear 420 without having to distinguish between the front and back sides.

[0064] On the basis of the above, in order to further facilitate the installation of the adjustment gear 420, the wave bead groove 423 on the same side of the adjustment gear 420 is usually distributed in a circular array on the side where it is located, with the axis of the adjustment gear 420 as the center of the circular array, such as Figure 4 The plurality of bead grooves 423 are arranged in a circular array, which can facilitate the workers to quickly find the locking position, that is, the position of the first bead groove and the second bead groove when installing the adjustment gear 420, thereby improving the assembly efficiency.

[0065] The present invention also provides a fascia gun, such as Figure 5 As shown, it includes a housing 500 and a massage drive mechanism disposed within the housing 500. The massage drive mechanism is the aforementioned linear reciprocating drive mechanism for the fascia gun. When the fascia gun is in use, the motor 110 drives the cylindrical cam 210 to rotate, thereby driving the guide post 410, which engages with the cam groove 211 on the cylindrical cam 210, to perform reciprocating linear motion. The guide post 410 then drives the piston rod 320 to perform reciprocating linear motion. After shutting down, the piston rod 320 is pushed inward to the bottom. At this point, the guide post 410 can be easily switched to engage with the cam groove 211 with different transmission strokes to adjust the amplitude of the fascia gun. The housing 500 is primarily used to mount and secure other components of the fascia gun and protect the components installed therein. The housing 500 is typically a split structure, for example, consisting of left and right housing parts, upper and lower housing parts, or front and rear housing parts.

[0066] In order to facilitate the installation and fixation of the motor 110 , the driving assembly further includes a motor bracket 120 , and the motor 110 is fixedly installed in the housing 500 via the motor bracket 120 .

[0067] In order to reduce the radial runout and axial movement of the cylindrical cam 210, as shown in FIG. Figure 3 and Figure 6 As shown, the transmission assembly further includes a bearing seat 220 with an end bearing 221. The bearing seat 220 is disposed within the housing 500 and located in front of the motor 110. The front end of the cylindrical cam 210 is matingly connected to the end bearing 221, and the rear end of the cylindrical cam 210 is matingly connected to the output end of the motor 110. A bearing hole is generally defined in the upper portion of the bearing seat 220, and the end bearing 221 is typically interference fit with the bearing hole.

[0068] In order to facilitate the connection between the cylindrical cam 210 and the output end of the motor 110 and improve the transmission efficiency, a D-shaped hole is usually provided at the rear end of the cylindrical cam 210, and the cylindrical cam 210 is connected to the output end of the motor 110 through the D-shaped hole.

[0069] In order to prevent the piston rod 320 from rotating during operation, the piston assembly generally includes a piston anti-rotation structure. The piston anti-rotation structure can be various, such as: a guide rail, a guide groove, an anti-rotation surface, an anti-rotation protrusion, etc.

[0070] Preferably, the piston anti-rotation structure includes an anti-rotation assembly provided on the piston rod 320, and a guide structure is provided on the inner wall surface of the housing 500; the anti-rotation assembly and the guide structure are slidably engaged together, and the travel range of the anti-rotation assembly is within the guide range of the guide structure. The travel range of the anti-rotation assembly refers to the range of movement of the anti-rotation assembly when it reciprocates with the piston rod 320, and the guide range of the guide structure refers to the range between the front and rear end positions of the anti-rotation assembly that the guide structure can guide. The guide structure can be of various types, such as: guide surfaces, guide grooves, guide rails, etc.; the anti-rotation assembly can also be of various types, such as: guide rods, guide wheels, anti-rotation surfaces, etc.

[0071] In order to ensure good guiding and anti-rotation effect, Figure 3 As shown, the anti-rotation assembly includes a slide bearing 330, which is mounted on the piston rod 320 via a connector. The guide structure is a guide slot, in which the slide bearing 330 is positioned, with the outer edge of the slide bearing 330 being able to mate with the slot wall. The piston anti-rotation structure, in which the slide bearing 330 and the guide slot cooperate, not only provides effective guidance and anti-rotation, but also facilitates assembly, reduces resistance during reciprocating motion, and ensures the flexibility of the reciprocating motion of the piston rod 320.

[0072] Based on the above, to ensure the stability of the piston rod 320 and the service life of the anti-rotation assembly, the anti-rotation assembly includes two slide bearings 330, which are symmetrically arranged on the piston rod 320. The guide structure includes two guide slots, which correspond one-to-one with the two slide bearings 330. Preferably, the two slide bearings 330 form a pair, and each pair of slide bearings 330 is symmetrically arranged on the piston rod 320. Multiple pairs of slide bearings 330 can be provided on the piston rod 320 as needed.

[0073] The present invention also provides another fascia gun, such as Figure 3 and Figure 6 As shown, it includes a shell 500 and a massage drive mechanism arranged in the shell 500, and the massage drive mechanism is the above-mentioned linear reciprocating drive mechanism for the fascia gun; the shell 500 includes a main shell 510; the front end of the main shell 510 is provided with a massage output hole 511, and the sliding sleeve 310 is nested and installed at the massage output hole 511 through a vibration damping ring 512.

[0074] Among them, the massage output hole 511 is the part where the piston rod 320 performs reciprocating linear motion, and the vibration damping ring 512 is mainly used to reduce the vibration transmitted to the shell 500 to protect the shell 500 and improve the user experience. The vibration damping ring 512 is usually made of elastic or flexible materials, such as rubber, silicone, etc.

[0075] Specifically, the housing 500 further includes a rear cover 520. A drive mechanism loading port 513 is provided at the rear end of the main housing 510, and the rear cover 520 is removably mounted on the drive mechanism loading port 513. The housing 500, primarily composed of the main housing 510 and the rear cover 520, has good integrity. Furthermore, the drive mechanism loading port 513 provided at the rear end of the main housing 510 facilitates the installation of the linear reciprocating drive mechanism within the housing 510. Various removable mounting methods are possible, such as securing with connectors, securing with snap-fit ​​structures, securing with magnetic structures, and the like.

[0076] Specifically, the fascia gun further includes a battery assembly 600. In order to facilitate the installation and removal of the battery assembly 600 and to facilitate the user to hold the fascia gun, Figure 3 and Figure 6 As shown, the battery assembly 600 is detachably mounted on the lower portion of the main housing 510 .

[0077] On the basis of the above, in order to further facilitate the installation of the battery assembly 600 and ensure the fixing effect, as shown in the following example Figure 3 As shown, the lower part of the main shell 510 is provided with a plug-in slot, and a positioning hole is provided in the plug-in slot; the upper end of the battery assembly 600 is provided with a positioning column 610, and the upper end of the battery assembly 600 is inserted into the plug-in slot, and is positioned and matched with the positioning hole through the positioning column 610, and is fixed together with the main shell 510 through a connecting piece.

[0078] Specifically, the fascia gun further includes a control assembly 700 , which is mounted on the rear end of the rear cover 520 ; the motor 110 and the battery assembly 600 are electrically connected to the control assembly 700 , respectively.

[0079] In order to facilitate the adjustment of the amplitude of the fascia gun and improve the user's adjustment experience, Figure 3 and Figure 6As shown, the adjustment component also includes a first button 430 and a second button 440, and the first button 430 and the second button 440 are both movably mounted on the main shell 510; the first button 430 can drive one of the guide columns 410 to extend into the corresponding cam groove 211, and the outer end of the first button 430 passes through the main shell 510 and is exposed outside the shell 500; the second button 440 can drive the other guide column 410 to extend into the corresponding cam groove 211, and the outer end of the second button 440 passes through the main shell 510 and is exposed outside the shell 500. The first button 430 can be configured to drive one of the guide posts 410 in various ways, including: the inner end of the first button 430 abuts against the outer end of one of the guide posts 410, so that movement of the first button 430 can drive the other; another example: the inner end of the first button 430 is coaxially aligned with the outer end of one of the guide posts 410, so that movement of the first button 430 can drive the other; another example: the first button 430 is connected to one of the guide posts 410 via a transmission member, so that movement of the first button 430 can drive the other. Similarly, the configuration in which the second button 440 can drive another guide post 410 can be any of the above-mentioned configurations in which the first button 430 can drive one of the guide posts 410.

[0080] During use, pressing the first button 430 causes one of the guide posts 410 to extend into the corresponding cam groove 211. At this time, the transmission stroke of the cam groove 211 is L1, and the amplitude of the piston rod 320 is A1, which is used for long-distance massage in areas with more muscles. When the amplitude needs to be adjusted, pressing the second button 440 causes the other guide post 410 to extend into the corresponding cam groove 211. The movement of the other guide post 410 drives the adjustment gear 420 to rotate, and the adjustment gear 420 then drives one of the guide posts 410 to move upward and withdraw from the corresponding cam groove 211. At this time, the transmission stroke of the cam groove 211 is L2, and the amplitude of the piston rod 320 is A2, which is used for short-distance massage in areas with less muscles. Switching the guide posts 410 through the first button 430 and the second button 440 is very convenient, and the appearance is quite different from that of traditional fascia massage guns, making it easy for users to experience it.

[0081] In order to facilitate the key limiting, the adjustment component further includes a key limiting structure. The key limiting structure can be of various types, such as a limiting groove, a limiting protrusion, a limiting block, etc.

[0082] Preferably, combined with Figure 3 and Figure 6As shown, the key limiting structure includes a key limiting block 450 with a key groove; the key limiting block 450 is arranged on the inner wall surface of the main housing 510, and the key groove and the inner wall surface of the main housing 510 together form a key limiting cavity;

[0083] The inner end of the first button 430 extends into the button limiting cavity and can pass through the bottom of the button groove. A first limiting portion 431 is provided on the rod section of the first button 430 in the button limiting cavity. A first return spring 432 is mounted on the first button 430 and is located between the first limiting portion 431 and the bottom surface of the button groove.

[0084] The inner end of the second button 440 extends into the button limiting cavity and can pass through the bottom of the button groove. The second button 440 is provided with a second limiting portion 441 on the rod section in the button limiting cavity, and a second return spring 442 is mounted on the second button 440. The second return spring 442 is located between the second limiting portion 441 and the bottom surface of the button groove.

[0085] The above-mentioned button limiting structure is not only conducive to limiting the first button 430 and the second button 440, but also easy to install, has a good fixing effect, and is conducive to button resetting.

[0086] In order to avoid interference between the first button 430 and the second button 440, preferably, a vertical partition is provided in the button groove of the button limit block 450, and the vertical partition divides the button groove into a first button groove and a second button groove; the first button 430 is in the first button groove, and the bottom of the first button groove is provided with a first through hole for the first button 430 to pass through; the second button 440 is in the second button groove, and the bottom of the second button groove is provided with a second through hole for the second button 440 to pass through.

Claims

1. A linear reciprocating drive mechanism for a fascia gun, comprising a drive assembly, a transmission assembly, and a piston assembly, wherein the drive assembly comprises a motor (110), the transmission assembly comprises a cylindrical cam (210) mounted on the output end of the motor (110), the cylindrical cam (210) being a component having a cam groove (211) formed on a cylindrical surface, the cam groove (211) being a curved groove surrounding the cylindrical cam (210), the length of the projection of the center line of the cam groove (211) on the axis of the cylindrical cam (210) being the transmission stroke, the piston assembly comprising a sleeve (310) and a piston rod (320), the piston rod (320) being nested in the sleeve (310) and parallel to the axis of the cylindrical cam (210), the piston rod (320) being connected to a guide column (410) adapted to the cam groove (211); and characterized in that: The guide post (410) is arranged on the piston rod (320) through an adjustment component, and the adjustment component can drive the guide post (410) to extend into or exit the cam groove (211); the number of the cam grooves (211) is at least two, wherein at least two cam grooves (211) have different transmission strokes.

2. The linear reciprocating drive mechanism for a fascia gun according to claim 1, characterized in that: There are two cam grooves (211), and there are two guide posts (410) corresponding to the two cam grooves (211). The piston rod (320) is provided with an adjustment groove (321). The adjustment assembly includes an adjustment gear (420) rotatably arranged in the adjustment groove (321). The two guide posts (410) are both arranged in the adjustment groove (321) and are respectively located on the front and rear sides of the adjustment gear (420). The two guide posts (410) are both provided with bar teeth (411) and are meshed with the adjustment gear (420) through their respective bar teeth (411). When the adjustment gear (420) rotates, the movement directions of the two guide posts (410) are opposite. When one of the guide posts (410) extends into the corresponding cam groove (211), the other guide post (410) withdraws from the corresponding cam groove (211).

3. The linear reciprocating drive mechanism for a fascia gun according to claim 2, characterized in that: A gear spindle (421) is provided in the adjustment groove (321), and the adjustment gear (420) is rotatably mounted on the gear spindle (421) via a gear bushing (422).

4. The linear reciprocating drive mechanism for a fascia gun according to claim 3, characterized in that: The gear spindle (421) is arranged along a direction perpendicular to the axis of the cylindrical cam (210).

5. The linear reciprocating drive mechanism for a fascia gun according to claim 2, characterized in that: The piston rod (320) is provided with a self-locking structure capable of limiting the free rotation of the adjustment gear (420).

6. The linear reciprocating drive mechanism for a fascia gun according to claim 5, characterized in that: The self-locking structure comprises a ball screw (322) mounted on the piston rod (320), wherein the adjusting ball of the ball screw (322) is located in the adjusting groove (321) and is pressed against the side of the adjusting gear (420); a first ball groove and a second ball groove are provided on the side of the adjusting gear (420) corresponding to the ball screw (322); when one of the guide posts (410) extends into the corresponding cam groove (211), the adjusting ball of the ball screw (322) is located in the first ball groove; when the other guide post (410) extends into the corresponding cam groove (211), the adjusting ball of the ball screw (322) is located in the second ball groove.

7. The linear reciprocating drive mechanism for a fascia gun according to claim 6, characterized in that: At least two bead grooves (423) are provided on both side surfaces of the adjusting gear (420), and the first bead groove and the second bead groove are two bead grooves (423) on one side surface of the adjusting gear (420).

8. The linear reciprocating drive mechanism for a fascia gun according to claim 7, characterized in that: The wave ball grooves (423) on the same side of the adjusting gear (420) are distributed in a circular array on the side where they are located, with the axis of the adjusting gear (420) as the center of the circular array.

9. A fascia gun comprising a housing (500) and a massage drive mechanism disposed within the housing (500), characterized in that: The massage drive mechanism is a linear reciprocating drive mechanism for a fascia gun as described in any one of claims 1 to 8.

10. A fascia gun comprising a housing (500) and a massage drive mechanism disposed within the housing (500), characterized in that: The massage drive mechanism is a linear reciprocating drive mechanism for a fascia gun as described in any one of claims 2 to 8; the shell (500) includes a main shell (510); the front end of the main shell (510) is provided with a massage output hole (511), and the sliding sleeve (310) is nested and installed at the massage output hole (511) through a vibration damping ring (512).

11. The fascia gun according to claim 10, characterized in that: The housing (500) further comprises a rear cover (520), a drive mechanism loading port (513) is provided at the rear end of the main housing (510), and the rear cover (520) is detachably mounted on the drive mechanism loading port (513).

12. The fascia gun according to claim 11, characterized in that: The invention also includes a battery assembly (600), which is detachably mounted on the lower portion of the main housing (510).

13. The fascia gun according to claim 12, characterized in that: The lower portion of the main housing (510) is provided with a plug-in slot, in which a positioning hole is provided; the upper end of the battery assembly (600) is provided with a positioning column (610), the upper end of the battery assembly (600) is inserted into the plug-in slot, and is positioned and matched with the positioning hole through the positioning column (610), and is fixed to the main housing (510) through a connecting piece.

14. The fascia gun according to claim 12, characterized in that: It also includes a control component (700), which is installed on the rear end of the rear cover (520); the motor (110) and the battery component (600) are electrically connected to the control component (700) respectively.

15. The fascia gun according to any one of claims 9 to 14, characterized in that: The drive assembly further includes a motor bracket (120), and the motor (110) is fixedly mounted in the housing (500) via the motor bracket (120).

16. The fascia gun according to any one of claims 9 to 14, characterized in that: The transmission assembly further comprises a bearing seat (220) with an end bearing (221), wherein the bearing seat (220) is arranged in the housing (500) and located in front of the motor (110), the front end of the cylindrical cam (210) is connected to the end bearing (221), and the rear end of the cylindrical cam (210) is connected to the output end of the motor (110).

17. The fascia gun according to claim 16, characterized in that: The cross section of the output end of the motor (110) is in a "D" shape; the rear end of the cylindrical cam (210) is provided with a D-shaped hole, and is matched with the output end of the motor (110) through the D-shaped hole.

18. The fascia gun according to any one of claims 9 to 14, characterized in that: The piston assembly further comprises a piston anti-rotation structure capable of preventing the piston rod (320) from rotating.

19. The fascia gun according to claim 18, characterized in that: The piston anti-rotation structure includes an anti-rotation component arranged on the piston rod (320), and a guide structure is provided on the inner wall surface of the housing (500); the anti-rotation component and the guide structure are slidably matched together, and the travel range of the anti-rotation component is within the guide range of the guide structure.

20. The fascia gun according to claim 19, characterized in that: The anti-rotation assembly includes a slide bearing (330), which is mounted on the piston rod (320) via a connecting piece; the guide structure is a guide slot, the slide bearing (330) is placed in the guide slot, and the outer edge of the slide bearing (330) can fit with the slot wall of the guide slot.

21. The fascia gun according to claim 20, characterized in that: The anti-rotation assembly includes two slide bearings (330), which are symmetrically arranged on the piston rod (320); the guide structure includes two guide slots, which correspond one to one to the two slide bearings (330).

22. The fascia gun according to any one of claims 10 to 14, characterized in that: The adjustment component further comprises a first button (430) and a second button (440), wherein the first button (430) and the second button (440) are both movably mounted on the main housing (510); the first button (430) is capable of driving one of the guide posts (410) to extend into the corresponding cam groove (211), and the outer end of the first button (430) passes through the main housing (510) and is exposed outside the housing (500); the second button (440) is capable of driving the other guide post (410) to extend into the corresponding cam groove (211), and the outer end of the second button (440) passes through the main housing (510) and is exposed outside the housing (500).

23. The fascia gun according to claim 22, characterized in that: The adjustment component also includes a button limiting structure.

24. The fascia gun according to claim 23, characterized in that: The key limiting structure comprises a key limiting block (450) with a key groove; the key limiting block (450) is arranged on the inner wall surface of the main shell (510), and the key groove and the inner wall surface of the main shell (510) together form a key limiting cavity; The inner end of the first button (430) extends into the button limiting cavity and can pass through the bottom of the button groove; a first limiting portion (431) is provided on the rod section of the first button (430) in the button limiting cavity; and a first return spring (432) is sleeved on the first button (430); the first return spring (432) is located between the first limiting portion (431) and the bottom surface of the button groove; The inner end of the second button (440) extends into the button limiting cavity and can pass through the bottom of the button groove. The second button (440) is provided with a second limiting portion (441) on the rod section in the button limiting cavity, and the second button (440) is sleeved with a second return spring (442). The second return spring (442) is located between the second limiting portion (441) and the bottom surface of the button groove.

25. The fascia gun according to claim 24, characterized in that: A vertical partition is provided in the key groove of the key limiting block (450), and the vertical partition divides the key groove into a first key groove and a second key groove; the first key (430) is located in the first key groove, and a first through hole is provided at the bottom of the first key groove for the first key (430) to pass through; the second key (440) is located in the second key groove, and a second through hole is provided at the bottom of the second key groove for the second key (440) to pass through.

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