Swing driving device and massage device with same

Abstract

The invention provides a swing driving device and a massage device with the same. The swing driving device comprises: a main body part; the driving part is arranged in the main body part; one part of the swinging part is mounted in the main body part in a manner of being perpendicular to the extension direction of the main body part and is connected with the driving part in a matching manner, the other part of the swinging part is positioned outside the main body part, and the extension direction of the swinging part is consistent with the extension direction of the main body part. Under the driving of the driving part, a part of the swing part located outside the main body part rotates and reciprocates relative to the main body part in the direction intersecting with the length direction of the main body part.

Description

Technical Field

[0001] The present invention relates to the technical field of motor drive structures, and in particular to a swing drive device and a massage device having the swing drive device. Background Art

[0002] The existing swing drive device is applied to the massage device. When the massage device is used, usually only a single point vibration can be achieved through one motor, and a large left and right swing like a seesaw cannot be achieved. Therefore, the massage experience is poor. It is necessary to provide a swing drive device that can achieve the vibration effect of left and right swing to improve the user's massage experience. Summary of the invention

[0003] The present invention is completed in view of the above-mentioned problems, and its purpose is to provide a swing driving device that can perform a continuous reciprocating swinging motion similar to a seesaw and a massage device having the swing driving device.

[0004] In order to solve the above technical problems, the present invention provides a swing driving device, characterized in that the swing driving device comprises:

[0005] Main body;

[0006] a driving unit installed inside the main body; and

[0007] The swing part has a part installed inside the main body in a manner perpendicular to the extension direction of the main body and connected to the driving part, and another part is located outside the main body and its extension direction is consistent with the extension direction of the main body.

[0008] Under the drive of the driving unit, a portion of the swinging unit located outside the main body rotates relative to the main body in a direction intersecting the longitudinal direction of the main body and performs reciprocating motion.

[0009] Furthermore, the swing driving device includes a vibration motor, and the vibration motor is installed at an end vibration motor of the swing part outside the main body or installed at one end of the main body close to the swing part.

[0010] Furthermore, the swinging part includes a swing rod rotating shaft and at least one swing rod vertically fixed to the swing rod rotating shaft.

[0011] The swing arm shaft is rotatably mounted on the main body and connected to the driving part.

[0012] The at least one swing rod is exposed from at least one side wall of the main body,

[0013] Two ends of the at least one swing rod rotate alternately and reciprocate relative to the side wall of the main body with the swing rod rotation axis as the central axis.

[0014] Further, the at least one swing rod is covered with a protective cover of soft material to form a massage arm;

[0015] The two ends of the massage arm rotate alternately and reciprocate relative to the side wall of the main body with the swing rod shaft as the central axis.

[0016] Furthermore, the driving unit includes a driving member.

[0017] The driving member is installed in the main body, and includes a motor shaft, a turntable arranged at one end of the motor shaft, and an eccentric column protruding from an end surface of the turntable toward a direction away from the motor shaft, and the eccentric column is connected to the rocker shaft.

[0018] Further, a first contact wall and a second contact wall are protrudingly provided on one side of the swing arm shaft close to the driving member, the first contact wall and the second contact wall are relatively parallel, and a slide groove is formed between the first contact wall and the second contact wall.

[0019] The eccentric column is rotatably accommodated in the slide groove, and the eccentric column drives the entire swing part to rotate by respectively moving the first contact wall and the second contact wall.

[0020] Furthermore, a first recess and a second recess are formed on both sides of the main body, respectively, and the swinging part is rotatably mounted on the first recess and the second recess.

[0021] Furthermore, the bottom surfaces of the first recess and the second recess are respectively provided with a first mounting hole and a second mounting hole, and the first mounting hole and the second mounting hole are connected to the interior of the main body.

[0022] Both ends of the swing arm shaft pass through the first mounting hole and the second mounting hole respectively, so that the swing part is rotatably mounted on the first recess and the second recess.

[0023] On the other hand, the present invention further provides a massage device having a swing drive device, wherein the swing drive device comprises:

[0024] Main body;

[0025] a driving unit installed inside the main body; and

[0026] The swing part has a part installed inside the main body in a manner perpendicular to the extension direction of the main body and connected to the driving part, and another part is located outside the main body and its extension direction is consistent with the extension direction of the main body.

[0027] Under the drive of the driving unit, a portion of the swinging unit located outside the main body rotates relative to the main body in a direction intersecting the longitudinal direction of the main body and performs reciprocating motion.

[0028] Furthermore, the swinging part includes a swing rod rotating shaft and at least one swing rod vertically fixed to the swing rod rotating shaft.

[0029] The swing rod shaft is rotatably mounted on the main body, and the swing rod shaft is connected to the driving part.

[0030] The at least one swing rod is exposed from at least one side wall of the main body,

[0031] The two ends of the at least one swing rod rotate and reciprocate alternately relative to the side wall of the main body with the swing rod rotation axis as the central axis.

[0032] The driving part comprises a driving member,

[0033] The driving member is installed in the main body, and includes a motor shaft, a turntable disposed at one end of the motor shaft, and an eccentric column protruding from one end surface of the turntable toward a direction away from the motor shaft, wherein the eccentric column is connected to the swing arm shaft.

[0034] A first contact wall and a second contact wall are protrudingly provided on one side of the swing arm shaft close to the driving member. The first contact wall and the second contact wall are relatively parallel and a sliding groove is formed between the first contact wall and the second contact wall.

[0035] The eccentric column is rotatably accommodated in the slide groove, and the eccentric column drives the entire swing part to rotate by respectively moving the first contact wall and the second contact wall.

[0036] Compared with the prior art, the swing drive device of the present invention has at least one swing rod and multiple motors, and the swing rod forms a massage arm on at least one side of the main body of the swing drive device. The swing drive device can not only realize the vibration of one end of the device, but also realize the left and right reciprocating swing of the massage arm, thereby providing a better massage effect to the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a perspective view showing the overall structure of the swing drive device according to the embodiment of the present invention.

[0038] Figure 2 yes Figure 1 The diagram shows the overall appearance of the swing drive device in working state and the schematic diagram of its main functional components.

[0039] Figure 3 yes Figure 1 A partially exploded schematic diagram of the swing drive device is shown.

[0040] Figure 4A It is a schematic diagram of the driving principle of the swing drive device involved in the present invention, wherein the eccentric column rotates to the bottom of the slide slot.

[0041] Figure 4B It is a schematic diagram of the driving principle of the swing drive device involved in the present invention, wherein the eccentric column rotates to the middle position of the slide slot.

[0042] Figure 4C It is a schematic diagram of the driving principle of the swing drive device involved in the present invention, wherein the eccentric column rotates to the top wall of the slide slot.

[0043] Figure 5 It is a schematic diagram showing the swing angle of the swing arm when the eccentric column abuts against the bottom wall of the slide groove of the swing arm shaft.

[0044] Main component symbols

[0045] 100 swing drive device, 10 main body, 20 swing part, 30 drive part, 50 protective cover, 101 receiving part, 101a receiving space, 103 installation part, 105 vibration massage part, 101a receiving space, 110 vibration motor, 1031 first recess, 1033 second recess, 1037 first installation hole, 1039 second installation hole, 1011 upper shell, 1013 lower shell, 120 battery, 121 control circuit board, 123 switch button, 124 drive motor, 125 drive member, 126 reduction gear set, 127 motor shaft, 128 turntable, 129 eccentric column, 131 rocker, 132 rocker shaft, 132a first contact wall, 132b second contact wall, 1320 slide groove, 133 extension wall, 134 vibration motor. DETAILED DESCRIPTION

[0046] Below, the technical scheme in the embodiment of the present invention is clearly and in detail described. Obviously, the described embodiment is a part of the embodiment of the present invention, rather than all the embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0047] Hereinafter, embodiments of the present invention will be described in detail. However, the present invention may be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein.

[0048] The following, combined Figure 1 to Figure 3 , the swing driving device 100 of the present invention is described.

[0049] Please also see Figure 1 and Figure 2 , Figure 1 1 is a three-dimensional diagram of the overall structure of the swing drive device involved in the embodiment of the present invention. The swing drive device 100 provided by the present invention is suitable for use in medical devices such as massage devices. Specifically, from a general perspective, the swing drive device 100 includes a main body 10, a swing part 20 and a drive part 30. The main body 10 can be a rod-shaped structure, a sphere or an ellipsoid. In this embodiment, the main body 10 is a long rod-shaped structure, and the lateral diameter of the part where the swing part 20 is installed is relatively narrow.

[0050] The main body 10 has a receiving portion 101, a mounting portion 103 and a vibration massage portion 105 in sequence. The receiving portion 101 is a cylindrical structure, and a receiving space 101a is provided inside the receiving portion 101 for mounting on the driving portion 30. The mounting portion 103 is recessed from opposite sides of one end of the receiving portion 101 in a direction perpendicular to the length direction of the main body 10 to form a first recess 1031 and a second recess 1033, so that when viewed in the length direction of the main body 10 (from Figure 1 When observing), the width of the receiving portion 101 is greater than the width of the mounting portion 103. The first recess 1031 and the second recess 1033 have a flat bottom surface structure, and the side walls extending from both ends of the bottom surface of the first recess 1031 and the second recess 1033 toward the receiving portion 101 and the vibration massage portion 105 are inclined surfaces. The inclined surfaces will not hinder the movement of the swinging portion 20. The bottom surfaces of the first recess 1031 and the second recess 1033 are respectively provided with a first mounting hole 1037 and a second mounting hole 1039, and the first mounting hole 1037 and the second mounting hole 1039 are connected to the receiving space 101a. A part of the swinging portion 20 is installed inside the mounting portion 103, and a part protrudes to the outside of the mounting portion 103 through the first mounting hole 1037 and the second mounting hole 1039 and is located in the first recess 1031 and the second recess 1033. Under the drive of the driving part 30 , a part of the swing part 20 rotates in the first recess 1031 and the second recess 1033 .

[0051] Figure 2 yes Figure 1 The diagram shows the overall appearance of the swing drive device in working state and the schematic diagram of its main functional components. Figure 3 yes Figure 1 The partially exploded schematic diagram of the swing drive device is shown in FIG. Figure 2 and Figure 3 As shown, a driving unit 30 is installed inside the main body 10. In addition, the swing drive device 100 also includes a protective cover 50, which covers the outer wall of the main body 10 and the swing part 20. The main body 10 is made of a hard ABS resin material to form a shell for accommodating various functional components. The protective cover 50 is a soft material, usually made of soft silicone or TPE material, with a soft and skin-friendly touch and a sealing and waterproof effect. The main body 10 can be an integrally formed structure (such as Figure 2 As shown), the main body 10 may also be a separable combination structure of the upper shell 1011 and the lower shell 1013 (as shown Figure 3 When the main body 10 is an integrally formed structure, an end cap (not shown) is detachably provided at one or both ends of the housing, and operations such as replacing batteries can be performed through the openings at the end caps. When the main body 10 is a separable combination structure of an upper housing 1011 and a lower housing 1013, after the above-mentioned functional elements are accommodated in the corresponding accommodation spaces in the lower body 1013, the upper housing 1011 and the lower housing 1013 are engaged or bonded together, and then a protective cover 50 with a soft rubber layer is coated on the outer periphery of the main body 10.

[0052] The vibration massage part 105 is located at one end of the mounting part 103 away from the receiving part 101, and has a smooth arc-shaped end surface. The vibration massage part 105 generates a vibration effect through a vibration motor 110 installed at one end of the main body 10 to achieve a better massage experience.

[0053] The driving part 30 is installed in the receiving space 101a of the receiving part 101 and connected to the swinging part 20, and includes a battery 120 received in the receiving space 101a of the main body 10, a control circuit board 121 located above the battery 120, a driving motor 124, a driving member 125 and a reduction gear set 126. The driving member 125 is electrically connected to the battery 120 and the control circuit board 121. A plurality of switch buttons 123 are provided on the control circuit board 121.

[0054] The driving member 125 includes a motor shaft 127 , a rotating disk 128 disposed at one end of the motor shaft 127 , and an eccentric column 129 protruding from one end surface of the rotating disk 128 in a direction away from the motor shaft 127 .

[0055] The driving member 125 drives the turntable 128 so that the turntable 128 rotates 360° continuously. The turntable 128 is a cylindrical platform and is connected to the motor shaft 127, so that it rotates under the drive of the motor shaft 127. The eccentric column 129 protrudes and extends from the edge of the turntable 128, and rotates synchronously around the central axis of the turntable 128. The eccentric column 129 is arranged at the edge of the turntable 128, and is staggered with a certain distance from the central axis of the turntable 128 and the motor shaft 127.

[0056] Please also see Figure 4A to Figure 4C The swing part 20 is generally in an H-shaped structure, and includes two swing rods 131 and a swing rod shaft 132 that cooperates with the eccentric column 129. The two swing rods 131 are vertically fixed to the two ends of the length direction of the swing rod shaft 132, and are fixed to the swing rod shaft 132 by snapping or bonding. A first contact wall 132a and a second contact wall 132b are protrudingly provided on one side of the swing rod shaft 132 close to the driving member 125. The first contact wall 132a and the second contact wall 132b are relatively parallel, and a slide groove 1320 is formed between the first contact wall 132a and the second contact wall 132b. The protruding direction of the first contact wall 132a and the second contact wall 132b is parallel to the length direction of the two swing rods 131.

[0057] The eccentric column 129 is rotatably accommodated in the slide groove 1320, and the eccentric column 129 contacts the first contact wall 132a and the second contact wall 132b respectively to drive the swing part 20. The slide groove 1320 can be directly recessed on the outer peripheral wall of the swing rod shaft 132, or it can be formed in two extension walls extending from the approximately middle position of the swing rod shaft 132 to the turntable 128. In this embodiment, the slide groove 1320 is formed in two extension walls 133 extending from the approximately middle position of the swing rod shaft 132 to the turntable 128. Further, a vibration motor 134 is respectively sleeved and installed on the upper end of each swing rod 131. The vibration motor 134 can give the swing rod 131 a vibration effect while the swing rod 131 swings up and down.

[0058] In this embodiment, the two ends of the swing rod shaft 132 pass through the first mounting hole 1037 and the second mounting hole 1039 respectively, so as to be rotatably mounted on the mounting portion 103. The middle parts of the two swing rods 131 are fixedly connected to the two ends of the swing rod shaft 132, and the two swing rods 131 are located in the first recess 1031 and the second recess 1033. When the two swing rods 131 are located in the first recess 1031 and the second recess 1033, in the length direction of the main body 10, the total width of the two swing rods 131 and the mounting portion 103 is equal to or greater than the width of the vibration massage portion 105. The swing rod 131 is in a long strip-shaped structure, and the outer side walls of the two swing rods 131 cover the protective cover 50 to form two massage arms X. The massage arms X are formed by covering the outer side walls of the swing rod 131 with the same material as the main body 10. In addition, the two massage arms X swing synchronously relative to the main body 10. Driven by the swing rod shaft 132, the two ends of each swing rod 131 move up and down in opposite directions. More specifically, the massage arm X is vertically connected to the left and right ends of the swing rod shaft 132, and its two ends can move in opposite directions relative to the side wall of the main body 10, thereby achieving a seesaw-like movement. In addition, the outer shell of the massage arm X (not shown) is seamlessly connected to the outer shell of the main body 10, thereby achieving a waterproof effect.

[0059] Below, refer to FIG. 4A to FIG. 4C , the working principle of the swing part 20 of the swing driving device 100 of the present invention is described in detail.

[0060] Driven by the driving motor 124, the motor shaft 127 rotates and drives the eccentric column 129 to rotate. At this time, the eccentric column 129 contacts the first contact wall 132a of the swinging part 20 and lifts the first contact wall 132a upward, and the swing rod shaft 132 rotates in the first mounting hole 1037 and the second mounting hole 1039. At the same time, the ends of the two swing rods 131 away from the driving member 125 move downward, and the ends close to the driving member 125 move upward. That is, the massage arms X rotate in the first direction relative to the main body 10. At this time, one end of the two massage arms X protrudes from the first recess 1031 and the second recess 1033 and is located outside the main body 10, so that they can contact the part to be massaged.

[0061] The motor shaft 127 continues to rotate, and drives the eccentric column 129 to continue to rotate. At this time, the eccentric column 129 contacts the second contact wall 132b of the swing part 20 and presses the second contact wall 132b downward, and the swing rod shaft 132 rotates in the first mounting hole 1037 and the second mounting hole 1039. At the same time, the ends of the two swing rods 131 away from the driving member 125 move upward, and the ends close to the driving member 125 move downward. That is, the massage arm X rotates relative to the main body 10 in the second direction opposite to the first direction. At this time, one end of the two massage arms X protrudes from the first recess 1031 and the second recess 1033 and is located outside the main body 10, so that it can contact the part to be massaged. The swing part 20 repeats the above movement to achieve repeated rotation movement, thereby achieving continuous massage of the part to be massaged.

[0062] Driven by the motor shaft 127, the eccentric column 129 moves up and down in the slide slot 1320, from the bottom of the slide slot 1320 to the middle of the slide slot 1320, and then to the top of the slide slot 1320. When the motor shaft 127 drives the eccentric column 129 to rotate, the eccentric column 129 moves the bottom wall or top wall of the slide slot 1320, so that the slide slot 1320 fixed on the swing rod shaft 132 drives the swing rod 131 to rotate, so that the two ends of the swing rod 131 rotate in opposite directions and switch back and forth, forming a seesaw-like movement. In other words, the two ends of each swing rod 131 rotate and reciprocate alternately relative to the side wall of the main body 10 with the swing rod shaft 132 as the central axis.

[0063] More specifically, if Figure 4A As shown, when the eccentric column 129 rotates to the bottom of the slide slot 1320, the bottom wall of the slide slot 1320 drives the swing rod shaft 132 to move downward under the action of the eccentric column 129. At this time, the end of the swing rod 131 close to the turntable 128 moves to the lowest point, and the end of the swing rod 131 with the vibration motor 134 moves to the highest point. Figure 4B As shown, when the eccentric column 129 rotates to the middle position of the slide slot 1320, the motor shaft 127, the eccentric column 129 and the swing rod shaft 132 are located in the same plane, the swing rod 131 rotates to the horizontal direction, and the eccentric column 129 is perpendicular to the swing rod shaft 132. Figure 4C As shown, when the eccentric column 129 rotates to the top of the slide slot 1320, the top wall of the slide slot 1320 drives the rocker arm shaft 132 to move upward under the manipulation of the eccentric column 129, so that the rocker arm 131 tilts upward toward one end of the turntable 128, and the end of the rocker arm 131 on which the vibration motor 134 is mounted moves downward.

[0064] Figure 5 is a schematic diagram showing the swing angle of the swing rod when the eccentric column abuts against the bottom wall of the slide slot of the swing rod rotating shaft. Figure 5As shown, in this embodiment, the swing angle range of the swing part 20 of the swing driving device 100 is preferably within the range of 1 to 45 degrees. That is, the swing angle range of the massage arm X is preferably 1 to 45 degrees. In addition, when the eccentric column 129 moves to the bottom of the slide slot 1320, the distance (interval) between the extension line of the eccentric column 129 toward the reduction gear set 126 and the eccentric column 129 is about 2 mm; when the eccentric column 129 moves to the top of the slide slot 1320, the distance (interval) between the extension line of the eccentric column 129 toward the reduction gear set 126 and the eccentric column 129 is also about 2 mm.

[0065] It is understandable that in other embodiments, the upper end of each swing rod 131 of the swing rod 131 may not be provided with the vibration motor 134. That is, the swing rod 131 only has a swinging function similar to a seesaw, and does not generate vibration itself.

[0066] It is understandable that in other embodiments, the vibration motor 134 may not be installed inside the end of the main body 10 opposite to the driving part 30 .

[0067] It is understood that in other embodiments, the switch button 123 disposed on the control circuit board 121 in the main body 10 may also be a touch switch, that is, the switch button can be controlled by touching the outer shell of the main body 10 .

[0068] It can be understood that in other embodiments, each swing rod 131 may also be a split structure, that is, a section of the swing rod 131 is connected to each side of the swing rod rotating shaft 132, thereby forming a four-section swing rod structure.

[0069] Compared with the prior art, the swing drive device 100 of the present invention can form massage arms X on both sides of the main body 10, and realize a seesaw-like motion by rotating the two ends of the massage arms in opposite directions, thereby forming a massage effect on the two sides of the main body 10. In addition, the present invention also installs a vibration motor at one end of the swing rod 131 forming each massage arm X, so that it vibrates while swinging, further enhancing the massage effect.

[0070] In addition, those skilled in the art should recognize that the above embodiments are only used to illustrate the present application, and are not intended to limit the present application. As long as they are within the spirit of the present application, appropriate changes and modifications to the above embodiments are within the scope of the present application.

Claims

1. A swing drive device, characterized in that: The swing drive device comprises: Main body; a driving unit installed inside the main body; and The swing part has a part installed inside the main body in a manner perpendicular to the extension direction of the main body and connected to the driving part, and another part is located outside the main body and its extension direction is consistent with the extension direction of the main body. Under the drive of the driving unit, a portion of the swinging unit located outside the main body rotates relative to the main body in a direction intersecting the longitudinal direction of the main body and performs reciprocating motion.

2. The swing drive device according to claim 1, characterized in that: The swing drive device further includes a vibration motor, and the vibration motor is installed at an end vibration motor of the swing part outside the main body or installed at one end of the main body close to the swing part.

3. The swing drive device according to claim 1, characterized in that: The swinging part includes a swing rod rotating shaft and at least one swing rod vertically fixed to the swing rod rotating shaft. The swing arm shaft is rotatably mounted on the main body and connected to the driving part. The at least one swing rod is exposed from at least one side wall of the main body, Two ends of the at least one swing rod rotate alternately and reciprocate relative to the side wall of the main body with the swing rod rotation axis as the central axis.

4. The swing drive device according to claim 3, characterized in that: The at least one swing rod is covered with a protective cover made of soft material to form a massage arm; The two ends of the massage arm rotate alternately and reciprocate relative to the side wall of the main body with the swing rod shaft as the central axis.

5. The swing drive device according to claim 3, characterized in that: The driving part comprises a driving member, The driving member is installed in the main body, and includes a motor shaft, a turntable arranged at one end of the motor shaft, and an eccentric column protruding from an end surface of the turntable toward a direction away from the motor shaft, and the eccentric column is connected to the rocker shaft.

6. The swing drive device according to claim 5, characterized in that: A first contact wall and a second contact wall are protrudingly provided on one side of the swing arm shaft close to the driving member. The first contact wall and the second contact wall are relatively parallel and a sliding groove is formed between the first contact wall and the second contact wall. The eccentric column is rotatably accommodated in the slide groove, and the eccentric column drives the entire swing part to rotate by respectively moving the first contact wall and the second contact wall.

7. The swing drive device according to claim 3, characterized in that: A first recess and a second recess are formed on both sides of the main body, respectively. The swing portion is rotatably mounted on the first recessed portion and the second recessed portion.

8. The swing drive device according to claim 7, characterized in that: The bottom surfaces of the first recess and the second recess are respectively provided with a first mounting hole and a second mounting hole, and the first mounting hole and the second mounting hole are connected to the interior of the main body. Both ends of the swing arm shaft pass through the first mounting hole and the second mounting hole respectively, so that the swing part is rotatably mounted on the first recess and the second recess.

9. A massage device, characterized in that: The massage device includes a swing drive device, and the swing drive device has: Main body; a driving unit installed inside the main body; and The swing part has a part installed inside the main body in a manner perpendicular to the extension direction of the main body and connected to the driving part, and another part is located outside the main body and its extension direction is consistent with the extension direction of the main body. Under the drive of the driving unit, a portion of the swinging unit located outside the main body rotates relative to the main body in a direction intersecting the longitudinal direction of the main body and performs reciprocating motion.

10. The massage device according to claim 9, characterized in that: The swinging part includes a swing rod rotating shaft and at least one swing rod vertically fixed to the swing rod rotating shaft. The swing rod shaft is rotatably mounted on the main body, and the swing rod shaft is connected to the driving part. The at least one swing rod is exposed from at least one side wall of the main body, The two ends of the at least one swing rod rotate and reciprocate alternately relative to the side wall of the main body with the swing rod rotation axis as the central axis. The driving part comprises a driving member, The driving member is installed in the main body, and includes a motor shaft, a turntable disposed at one end of the motor shaft, and an eccentric column protruding from one end surface of the turntable toward a direction away from the motor shaft, wherein the eccentric column is connected to the swing arm shaft. A first contact wall and a second contact wall are protrudingly provided on one side of the swing arm shaft close to the driving member. The first contact wall and the second contact wall are relatively parallel and a sliding groove is formed between the first contact wall and the second contact wall. The eccentric column is rotatably accommodated in the slide groove, and the eccentric column drives the entire swing part to rotate by respectively moving the first contact wall and the second contact wall.

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