Control device for stroke adjustment mechanism and massage device equipped with same

Abstract

To provide a massage apparatus capable of changing the stroke of the linear reciprocating motion of a massage head.SOLUTION: When the mounting screw 38 of the eccentric shaft 32 connected to the drive shaft of the drive motor makes one rotation in the clockwise direction, the center position O ' of the shaft portion of the mounting screw becomes the maximum stroke position (= L2 * 2) directly opposite in the Y direction, so the position (point A) of the mounting screw 42 of the piston rod projecting from the sleeve is made to move to the maximum stroke position; When the connecting portion (mounting screw) of the eccentric shaft is rotated from a position based on a straight line in the Y-direction passing through the center of the center hole of the eccentric shaft only within a range from a position R of a rotation angle β in the counterclockwise direction to a position L of a rotation angle α in the clockwise direction after passing through the straight line in the Y-direction passing through the center of the center hole of the eccentric shaft, the base end portion (mounting screw) of the piston rod connected to the other end of the connecting rod member 34 is reciprocated with a stroke of L3 in the Y-direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a control device for a stroke adjustment mechanism and a massage device equipped with the same. Regarding. [Background technology]

[0002] A fascia gun that massages the soft tissues around joints by impacting (vibrating) the soft tissues of the human body with a spherical massage head is in practical use, as shown in Patent Document 1, for example. The massage head in such a fascia gun is reciprocated only by a stroke set to a predetermined dimension via an eccentric wheel, a connecting shaft, a link, a piston, etc., which are respectively connected to the output shaft of a drive motor built into the main body of the massage device.

[0003] When treating fascia at an affected area using the massage head of the fascia gun, a single massage intensity and amplitude based on a stroke set to a predetermined size can cause pain to the patient if the stroke is relatively large and applied to an area with little muscle. On the other hand, a relatively small stroke and applied to an area with a lot of muscle can result in an ineffective massage. This means that it is difficult to provide appropriate treatment tailored to the depth of the fascial layer, such as the head, back, limbs, and buttocks. To address this issue, a massage device with adjustable massage depth has been proposed, as shown in Patent Document 2.

[0004] Such a massage device includes a drive motor, a drive link, a massage member (hereinafter also referred to as a massage head), an adjustment mechanism, an eccentric wheel, and a sliding part. The drive rotation shaft provided on the output shaft of the drive motor is connected to the rotation center of the eccentric wheel.

[0005] The radial dimensions of the central end of the drive link and the center of rotation of the drive motor are adjusted by engaging the adjustment mechanism with the sliding part, and the central end of the drive link, which is connected to the upper end of the sliding part that is movably mounted on the carved block of the adjustment stand described later, is moved closer to or farther away from the center of rotation (axis) of the drive motor, thereby realizing a change in the radial distance between the central end of the drive link and the center of rotation (axis) of the eccentric wheel, and achieving the purpose of adjusting the movement depth of the massage member.

[0006] The above-mentioned adjustment mechanism includes an axial adjustment unit and an adjustment base. The axial adjustment unit includes an adjustment knob, an adjustment gear disk, and an adjustment ring. The axial adjustment unit adjusts the axial distance between the adjustment base and the eccentric wheel by moving the adjustment base along the axial direction, and the eccentric wheel and the adjustment base as a whole perform circumferential movement when in operation. An engraved block is provided on the axial side of the adjustment base. The engraved block has an outwardly inclined slope on which a sliding part is movably disposed, and the sliding part can move relatively along the slope. The upper end of the sliding part is connected to the axial hole at the center end of the drive link.

[0007] The adjustment knob has external teeth that mesh with the external teeth of the adjustment gear disk. The adjustment gear disk and the adjustment ring are threadedly engaged, allowing the adjustment gear disk and the adjustment ring to rotate circumferentially and move axially. The adjustment base is located within the adjustment ring and is axially movable. A portion of the adjustment knob is exposed to the outside of the housing of the massage device, allowing the user to easily press and rotate the adjustment knob to move the adjustment base and the eccentric wheel closer to or farther from each other, causing the sliding element to move relatively along the slope of the engraved block, thereby increasing or decreasing the distance between the upper end of the sliding element and the center end of the drive link and the center of the eccentric wheel. Therefore, as the distance between the center end of the drive link and the axis of the eccentric wheel increases, the stroke of the linear reciprocating motion of the massage head connected to the traction end of the drive link increases, thereby changing the movement depth of the massage head. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 7303588 [Patent Document 2] Patent No. 7375244 Summary of the Invention [Problem to be solved by the invention]

[0009] However, as shown in Patent Document 2, the adjustment mechanism in a massage device that can adjust the massage depth by changing the stroke of the linear reciprocating motion of the massage head comprises an axial adjustment unit and an adjustment base, and the axial adjustment unit is composed of an adjustment knob, an adjustment gear disc, and an adjustment ring, which require complex gear mechanisms, cam mechanisms, etc., so the number of parts in the massage device increases, and there is a risk that the manufacturing costs of the massage device will increase.

[0010] In consideration of the above problems, the present invention aims to provide a control device for a stroke adjustment mechanism, and a massage device equipped with the same, which can change the stroke of the linear reciprocating motion of the massage head with a simple configuration of the massage device. [Means for solving the problem]

[0011] In order to achieve the above object, the control device for a stroke adjustment mechanism according to the present invention includes a stroke adjustment mechanism including an eccentric shaft having a central hole to which an end portion of an output shaft of a drive motor is concentrically connected and a connecting portion formed eccentrically and spaced apart from the central hole, a piston rod guided so as to be able to reciprocate along a straight line passing through the center of the central hole, and a connecting rod member rotatably connecting the connecting portion of the eccentric shaft and a base end portion of the piston rod, which are spaced apart from each other; a rotation angle detection unit that detects the rotation angle of the base end portion of the output shaft of the drive motor; and a control device for detecting a rotation angle of the base end portion of the output shaft of the drive motor in a clockwise direction based on a straight line passing through the center of the central hole at the connecting portion of the eccentric shaft around the output shaft of the drive motor in accordance with the stroke of the piston rod in the stroke adjustment mechanism. and a control unit having a memory unit for storing data indicating the relationship between the rotation angle of the base end of the output shaft of the drive motor and the detection output from the rotation angle detection unit, and configured to cause the connecting part of the eccentric shaft to rotate continuously in the clockwise or counterclockwise direction based on the detection output from the rotation angle detection unit, the rotation angle range in the clockwise and counterclockwise directions relative to a straight line passing through the center of the central hole in the connecting part of the eccentric shaft set by the rotation angle range setting unit, and the data, and to cause the connecting part of the eccentric shaft to rotate continuously in the clockwise or counterclockwise direction based on the straight line passing through the center of the central hole in both directions within a rotation angle range of less than 180° in the clockwise and counterclockwise directions relative to the straight line passing through the center of the central hole. The rotation angle detector may include a ring-shaped magnet fixed to the base end of the output shaft of the drive motor, a Hall element substrate having two Hall elements arranged opposite the magnet, and a signal processor that processes the detection output signals from the two Hall elements based on the detection output signals to obtain data representing the rotation angle of the output shaft of the drive motor. The drive motor may be a motor with a brake. Furthermore, a massage device equipped with a stroke adjustment mechanism control device according to the present invention includes an eccentric shaft having a central hole to which an end portion of an output shaft of a drive motor is concentrically connected and a connecting portion formed eccentrically and spaced apart from the central hole, a stroke adjustment mechanism including: an eccentric shaft having a central hole to which an end portion of an output shaft of a drive motor is concentrically connected and a connecting portion formed eccentrically and spaced apart from the central hole; a piston rod guided so as to be able to reciprocate along a line passing through the center of the central hole of the eccentric shaft; a connecting rod member rotatably connecting the connecting portion of the eccentric shaft and a base end portion of the piston rod, which are spaced apart from each other; a guide sleeve guiding the piston rod in the stroke adjustment mechanism so as to be able to reciprocate along a line passing through the center of the central hole of the eccentric shaft; a massage head detachably connected to the end portion of the piston rod in the stroke adjustment mechanism; a rotation angle detection unit detecting a rotation angle of the base end portion of the output shaft of the drive motor; and a stroke adjustment mechanism based on a line passing through the center of the central hole of the connecting portion of the eccentric shaft around the output shaft of the drive motor in accordance with the stroke of the piston rod in the stroke adjustment mechanism. the rotation angle range setting unit that sets a rotation angle range in the clockwise and counterclockwise directions based on the rotation angle of the base end of the output shaft of the drive motor; a memory unit that stores data indicating the relationship between the rotation angle of the base end of the output shaft of the drive motor and the detection output from the rotation angle detection unit, and the control board is equipped with a control unit that causes the connection part of the eccentric shaft to rotate continuously in the clockwise or counterclockwise direction based on the detection output from the rotation angle detection unit, the rotation angle range in the clockwise and counterclockwise directions based on a straight line passing through the center of the central hole in the connection part of the eccentric shaft set by the rotation angle range setting unit, and the data, and also causes the connection part of the eccentric shaft to rotate in both directions in the clockwise and counterclockwise directions within a rotation angle range of less than 180° based on the straight line passing through the center of the central hole; a secondary battery that supplies power to the drive motor and the control board; Furthermore, the tolerance of the inner diameter of the guide sleeve relative to the outer diameter of the piston rod may be set, for example, in the range of +0.2 mm to +0.3 mm.The rotation angle detection unit may include an annular magnet fixed to the base end of the output shaft of the drive motor, a Hall element substrate having two Hall elements arranged opposite the magnet, and a signal processing unit that processes the detection output signals based on the detection output signals from the two Hall elements to obtain data representing the rotation angle of the output shaft of the drive motor.The drive motor may be a motor with a brake. [Effects of the Invention]

[0012] The stroke adjustment mechanism control device and massage device equipped with the same according to the present invention comprise: a stroke adjustment mechanism; a rotation angle detection unit that detects the rotation angle of the base end of the output shaft of the drive motor; a rotation angle range setting unit that sets a rotation angle range in a clockwise and counterclockwise direction around the output shaft of the drive motor based on a straight line passing through the center of the central hole in the connecting portion of the eccentric shaft in accordance with the stroke of the piston rod in the stroke adjustment mechanism; and a control unit, wherein the control unit has a memory unit that stores data representing the relationship between the rotation angle of the base end of the output shaft of the drive motor and the detection output from the rotation angle detection unit, and causes the connecting portion of the eccentric shaft to rotate in both directions within the rotation angle range in a clockwise and counterclockwise direction based on the detection output from the rotation angle detection unit, the rotation angle range in a clockwise and counterclockwise direction based on a straight line passing through the center of the central hole in the connecting portion of the eccentric shaft set by the rotation angle range setting unit, and the data. Therefore, the stroke of the linear reciprocating motion of the massage head can be changed with a simple configuration of the massage device. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 2 is a control block diagram showing a control unit provided in an example of a control device for a stroke adjusting mechanism according to the present invention. [Figure 2]1 is an exploded perspective view showing the configuration of an example of a massage device equipped with a control device for a stroke adjustment mechanism according to the present invention. [Figure 3] FIG. 3 is a cross-sectional view of the example of the massage device shown in FIG. 2. [Figure 4] 3(A) and 3(B) are perspective views showing a stroke adjusting mechanism, a control board, and a Hall element board provided in the example of the massage device shown in FIG. 2. [Figure 5] 5A and 5B are diagrams illustrating the operation of the stroke adjusting mechanism shown in FIGS. [Figure 6] 10 is a graph showing the output voltage of the output signal from the angle output section, which changes in proportion to the rotation angle of the output shaft of the drive motor. [Figure 7] 10 is a partial cross-sectional view of the stroke adjusting knob showing the configuration of a voltage setting switch of a Hall element substrate arranged on the inner periphery of the stroke adjusting knob. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] FIG. 2 is a schematic diagram showing the configuration of an example of a massage device equipped with a control device for a stroke adjustment mechanism according to the present invention.

[0015] The massage device 10 comprises a spherical massage head 8 (see FIG. 3), a piston head unit movably disposed within a sleeve 16 and to which the massage head 8 is detachably connected, and a massage device main body to which the piston head unit and the sleeve 16 are connected. As shown in FIG. 3, the piston head unit comprises a flexible, adhesive bushing 48 inserted into the inner periphery of one open end of the sleeve 16, a guide sleeve 46 disposed on the inner periphery of the bushing 48 and movably guiding a piston rod 44 (described later), and a piston rod 44 having an internal thread portion 44FS (see FIGS. 4(A) and (B)) to which an external thread portion serving as the connecting end of the massage head 8 is detachably connected. The tolerance of the internal diameter of the guide sleeve 46 relative to the external diameter of the piston rod 44 is set, for example, within a range of +0.2 mm to +0.3 mm.

[0016] 2 and 3, the massage device main body includes a lower housing 14 as a handle to be held by a user, an upper housing 12 to which the other open end of the sleeve 16 is connected, a brake-equipped drive motor 26 disposed inside the lower housing 14 and the upper housing 12 as housings and supported by a motor support part 24, an eccentric shaft 32 connected to one end of an output shaft 26S of the brake-equipped drive motor 26, an annular magnet 28 connected to the other end of the output shaft 26S of the brake-equipped drive motor 26, a connecting rod member 34 connected at one end to the eccentric shaft 32, a piston rod 44 connected to the other end of the connecting rod member 34 to reciprocate, and a control board 50 (see FIG. 4(A)) that drives and controls the drive motor 26. ), (B)), a secondary battery (lithium ion battery) 20 arranged inside the lower housing 14 and supplying power to the brake-equipped drive motor 26 and the control board 50, an on / off button 22B arranged on the charge control board 22 arranged on the secondary battery 20 and connected to the control board 50 in response to operation of the operating unit 14B arranged on the lower housing 14, which controls the on / off of the charge control board 22, a stroke adjustment knob 18 arranged rotatably at the top end of the upper housing 12 and adjusting the stroke of the massage head 8 and the piston rod 44, and a Hall element board 30 equipped with a voltage setting switch 30a having a pinion gear 30apg that meshes with internal teeth 18G formed on the inner circumference of the stroke adjustment knob 18.

[0017] The lower housing 14 has an interior motor support portion 24 and an accommodation portion that accommodates the secondary battery 20, charge control board 22, and connecting rod member 34 that are arranged inside the motor support portion 24. As shown in Figures 2 and 3, the motor support portion 24 is composed of a cylindrical main body portion that fits into the inner peripheries of the upper housing 12 and the lower housing 14, and a cylindrical end portion that is formed integrally with the main body portion so as to be perpendicular to the central axis of the main body portion, is inserted into the inner periphery of the sleeve 16 that constitutes part of the housing, and through which passes the coupling portion of the piston rod 44 that is coupled to the other end of the connecting rod member 34. The main body portion has a circular plate that receives the drive motor 26, and has a hole through which the output shaft 26S of the brake-equipped drive motor 26 passes.

[0018] The connecting portion of the piston rod 44 connected to the other end of the connecting rod member 34 consists of a small bearing 40 inserted into a hole formed in the other end of the connecting rod member 34, and a mounting screw 42 for attaching the small bearing 40 to the base end of the piston rod 44. The mounting screw 42 is screwed into an internally threaded hole in the base end of the piston rod 44. The connecting portion of the eccentric shaft 32 connected to one end of the connecting rod member 34 consists of a large bearing 36 inserted into a hole formed in one end of the connecting rod member 34, and a mounting screw 38 for attaching the large bearing 36 to the lower part of the eccentric shaft 32. The mounting screw 38 is screwed into an internally threaded hole 32FS in the lower part of the eccentric shaft 32.

[0019] 5, for example, the direction of a line connecting the center position O' of the shank of the mounting screw 38 (the female threaded hole 32FS of the connecting portion of the eccentric shaft 32) and the center position O of the central hole 32a of the eccentric shaft 32 is defined as the Y direction, and the direction perpendicular to the Y direction is defined as the X direction. As shown in Fig. 5, the center position O' of the shank of the mounting screw 38 (the female threaded hole 32FS of the connecting portion of the eccentric shaft 32) is eccentric and separated by a predetermined distance L2 in the Y direction from the center position O of the central hole 32a of the eccentric shaft 32 to which the tip end of the output shaft 26S of the drive motor 26 is concentrically fixed.

[0020] As a result, for example, when the mounting screw 38 of the eccentric shaft 32 is rotated 180 degrees from the position shown in Figure 5, the center position O' of the shaft portion of the mounting screw 38 becomes the maximum stroke position (= L2 x 2) which is directly opposite in the Y direction, and the position (point A) of the mounting screw 42 of the piston rod 44 protruding from the sleeve 16 is moved to the maximum stroke position. On the other hand, when the connecting portion (mounting screw 38) of the eccentric shaft 32 is rotated counterclockwise from a position based on a straight line in the Y direction passing through the center of the central hole 32a of the eccentric shaft 32 shown in Figure 5, for example, from position R at a rotation angle β to position L at a rotation angle α in the clockwise direction, passing the straight line in the Y direction passing through the center of the central hole 32a of the eccentric shaft 32, that is, when the connecting portion (mounting screw 38) of the eccentric shaft 32 is swung counterclockwise and clockwise, the base end portion (mounting screw 42) (point A) of the piston rod 44 connected to the other end of the connecting rod member 34 is caused to reciprocate with a stroke of distance L3 in the Y direction.

[0021] Therefore, the stroke adjustment mechanism is composed of the brake-equipped drive motor 26, the eccentric shaft 32, the connecting rod member 34, the piston rod 44, the mounting screw 38 for attaching the large bearing 36 to the lower part of the eccentric shaft 32, and the mounting screw 42 for attaching the small bearing 40 to the base end of the piston rod 44.

[0022] As shown in FIG. 7, the stroke adjustment knob 18 has internal teeth 18G arranged at a predetermined angle along the circumferential direction. These teeth mesh with the pinion gear 30apg of the voltage setting switch 30a of the Hall element board 30, which is located on the inner periphery of the knob. A disc-shaped dial 30ad is located on the inner periphery of the pinion gear 30apg of the voltage setting switch 30a. The numbers 2, 3, 4, 5, 6, and 7, which indicate the stroke, are engraved at predetermined intervals along the circumferential direction. The numbers on the dial 30ad are visible from above through a through-hole TH formed at the top end of the stroke adjustment knob 18. The voltage setting switch 30a incorporates, for example, a potentiometer whose internal resistance changes as the pinion gear 30apg rotates. With this configuration, when the stroke adjustment knob 18 is rotated clockwise, the pinion gear 30apg is rotated clockwise, and the stroke value seen through the through hole TH decreases. Conversely, when the stroke adjustment knob 18 is rotated counterclockwise, the pinion gear 30apg is rotated counterclockwise, and the stroke value seen through the through hole TH increases. As shown in Figures 4(A) and 4(B), the Hall element board 30 is fixed to a board support BKA, which is fixed to a bracket BK that forms part of the upper housing 12, so as to face the annular magnet 28. The control board 50 is supported by the bracket BK.

[0023] The annular magnet 28 is magnetized with a north pole and a south pole separated by 180° around the other end of the fixed output shaft 26S, and the north pole and south pole face each other, as shown in Fig. 4, to the Hall elements 30HA and 30HB serving as rotation angle detection elements on the Hall element substrate 30, which are arranged opposite each other at 90° intervals around the other end of the output shaft 26S. As a result, detection output signals of the same waveform but shifted in phase by 90° are obtained from the Hall elements 30HA and 30HB.

[0024] In addition to the above configuration, an example of a massage device equipped with a stroke adjustment mechanism control device according to the present invention is equipped with a control unit 52 provided on the above-mentioned control board 50, as shown in FIG.

[0025] The control unit 52 receives setting data DV representing the output voltage threshold set by the voltage setting switch 30a based on a command signal CS representing the required stroke of the massage head 8 (piston rod 44) ​​from the stroke adjusting knob 18 rotated by the user. As a result, the stroke adjusting knob 18 and the voltage setting switch 30a form a rotation angle range setting section that sets the rotation angle range of the connecting section of the eccentric shaft 32, which will be described later. In addition, data Dro representing the rotation angle of the output shaft 26S of the brake-equipped drive motor 26 obtained via a signal processing unit that processes the detection output signals based on the detection output signals from the Hall elements 30HA and 30HB of the Hall element substrate 30 is also supplied to the control unit 52.

[0026] The signal processing unit described above includes, for example, a Hall element driving / input signal amplifier unit 54 that amplifies the detection output signals from the Hall elements 30HA and 30HB; an angle conversion circuit unit 56 that forms an angle detection signal representing an angle in the range of 0° to 180° based on the signal from the Hall element driving / input signal amplifier unit 54 and outputs the angle detection signal; an angle output unit 58 that forms a signal representing the rotation angle of the output shaft 26S of the brake-equipped drive motor 26 based on the angle detection signal from the angle conversion circuit unit 56 and outputs the signal; and an A / D converter 60 that converts the output signal from the angle output unit 58 into a digital signal and supplies the digital data Dro to the control unit 52.

[0027] The control unit 52 includes a memory section 52M that stores data representing a graph showing the relationship between the rotation angle (°) of the output shaft 26S of the brake-equipped drive motor 26 within a range of 0° to 180° and the output voltage (V) of the output signal from the angle output section 58, as well as program data for the motor drive circuit 62 that controls the drive of the brake-equipped drive motor 26, and other data including program data for controlling the charging of the secondary battery (lithium ion battery) 20, as shown in Fig. 6. In Fig. 6, the vertical axis represents the output voltage (V) of the output signal from the angle output section 58, and the horizontal axis represents the rotation angle (°) of the output shaft 26S of the brake-equipped drive motor 26 within a range of 0° to 180°, showing the output voltage (V) of the output signal from the angle output section 58 that changes in proportion to the rotation angle of the output shaft 26S of the brake-equipped drive motor 26. When the output voltage (V) is 3.0 (V), the rotation angle of the output shaft 26S of the brake-equipped drive motor 26 is 180°, and the maximum stroke (= L2 × 2) of the massage head 8 (piston rod 44) ​​is obtained. On the other hand, when the output voltage (V) is 2.15 (V), the rotation angle is 130°, and the minimum stroke (2 mm) of the massage head 8 (piston rod 44) ​​is obtained.

[0028] In using the massage device 10 with this configuration, after the ON / OFF button 22B is turned on by operating the operating portion 14B of the lower housing 14, the user rotates the stroke adjustment knob 18 by a predetermined angle corresponding to the required stroke of the massage head 8 (piston rod 44), for example. As a result, the control unit 52 refers to the data DV representing the resistance value from the voltage setting switch 30a and the graph shown in Figure 6 read from the memory portion 52M based on the data Dro, and supplies a drive control signal to the motor drive circuit 62 to control the drive of the brake-equipped drive motor 26.

[0029] For example, in FIG. 6, when the graph shown in FIG. 6 is referenced based on the data DV from the voltage setting switch 30a and the output voltage (V) is set to 0.5 (V), the control unit 52 supplies a control signal CR to the motor drive circuit 62, which then generates a drive signal based on the control signal CR and supplies it to the brake-equipped drive motor 26. When the control unit 52 determines based on the data Dro that the output shaft 26S of the brake-equipped drive motor 26 has reached position R at a rotation angle of 30° counterclockwise in Figure 5, it supplies a control signal CS to the motor drive circuit 62 to activate the brake so as to temporarily stop the rotation of the output shaft 26S of the brake-equipped drive motor 26, and then releases the brake and supplies a control signal CL to the motor drive circuit 62 to reverse the rotation of the output shaft 26S of the brake-equipped drive motor 26 in the clockwise direction from position R. When the control unit 52 determines based on the data Dro that the output shaft 26S of the drive motor 26 has reached position L at a rotation angle of 30° clockwise, it supplies a control signal CS to the motor drive circuit 62 to activate the brake so as to temporarily stop the rotation of the output shaft 26S of the brake-equipped drive motor 26, and then releases the brake and supplies a control signal CR to the motor drive circuit 62 to reverse the rotation of the output shaft 26S of the brake-equipped drive motor 26 in the counterclockwise direction from position L. The control unit 52 thereafter repeats the above-described control until a new command signal CS representing the required stroke of the massage head 8 (piston rod 44) ​​is supplied from the stroke adjustment knob 18 rotated by the user, or until the ON / OFF button 22B is turned off. When the output voltage (V) is set to 3.0 (V), the control unit 52 supplies a control signal CR to the motor drive circuit 62 based on the data Dro so as to rotate the output shaft 26S of the brake-equipped drive motor 26 clockwise by a rotation angle of 360° in FIG. 5, i.e., continuously clockwise.

[0030] Therefore, by rotating the output shaft 26S of the drive motor 26 in the range from position R at a rotation angle of 30° counterclockwise to position L at a rotation angle of 30° clockwise in Figure 5, the massage head 8 (piston rod 44) ​​is reciprocated at a stroke corresponding to the required stroke. In other words, with the simple configuration of the massage device 10, the stroke of the linear reciprocating motion of the massage head 8 can be changed.

[0031] In the above example, the spherical massage head 8 is attached to the massage device main body, but this is not limited to this example, and for example, massage heads of other shapes and structures may be detachably attached to the massage device main body. Also, while an example of the control device for a stroke adjustment mechanism according to the present invention is applied to a massage device, this is not limited to this example, and it may of course be applied to, for example, a vibrator equipped with a stroke adjustment mechanism. [Explanation of symbols]

[0032] 8 massage heads 10 Massage equipment 18 Stroke adjustment knob 20 Secondary battery 26 Brake-equipped drive motor 26S output shaft 30 Hall element board 30a voltage setting switch 32 Eccentric shaft 34 Connecting rod member 44 Piston rod 46 Guide sleeve 50 control board 52 Control Unit 52M storage section 62 Motor drive circuit

Claims

1. a stroke adjustment mechanism including: an eccentric shaft having a central hole to which the end of the output shaft of the drive motor is concentrically connected, and a connecting part formed eccentrically and spaced apart from the central hole; a piston rod having a massage head detachably connected to the end and guided so as to be reciprocable along a straight line passing through the center of the central hole; and a connecting rod member rotatably connecting the connecting part of the eccentric shaft and the base end of the piston rod, which are spaced apart from each other; a rotation angle detection unit that detects a rotation angle of a base end portion of the output shaft of the drive motor; a rotation angle range setting unit that sets a rotation angle range of less than 180° in a clockwise direction and a counterclockwise direction about a straight line passing through the center of the central hole at a connection portion of the eccentric shaft around the output shaft of the drive motor in accordance with a stroke of the piston rod in the stroke adjustment mechanism; the rotation angle range setting unit is composed of a stroke adjustment knob and a voltage setting switch that outputs an output voltage according to the rotation of the knob, a control unit having a memory unit for storing data indicating the relationship between the rotation angle of the base end of the output shaft of the drive motor and the detection output from the rotation angle detection unit, and causing the connecting unit of the eccentric shaft to rotate continuously in a clockwise or counterclockwise direction based on the detection output from the rotation angle detection unit, the rotation angle range set by the rotation angle range setting unit, and the data, and causing the connecting unit to rotate in both directions in a clockwise and counterclockwise direction within a rotation angle range of less than 180° based on a straight line passing through the center of the central hole; A control device for a stroke adjustment mechanism comprising:

2. 2. The stroke adjustment mechanism control device according to claim 1, wherein the rotation angle detection unit includes: an annular magnet fixed to the base end of the output shaft of the drive motor; a Hall element substrate having two Hall elements arranged opposite the magnet; and a signal processing unit that processes detection output signals from the two Hall elements based on the detection output signals to obtain data representing the rotation angle of the output shaft of the drive motor.

3. a stroke adjustment mechanism including an eccentric shaft having a central hole to which an end portion of an output shaft of a drive motor is concentrically connected and a connecting portion formed eccentrically and spaced apart from the central hole, a piston rod guided so as to be able to reciprocate along a straight line passing through the center of the central hole of the eccentric shaft, and a connecting rod member rotatably connecting the connecting portion of the eccentric shaft and a base end portion of the piston rod, which are arranged spaced apart from each other; a guide sleeve that guides the piston rod in the stroke adjustment mechanism so that the piston rod can reciprocate along a straight line that passes through the center of the central hole of the eccentric shaft; a massage head detachably connected to an end portion of the piston rod of the stroke adjustment mechanism; a rotation angle detection unit that detects a rotation angle of a base end portion of the output shaft of the drive motor; a rotation angle range setting unit that sets a rotation angle range of less than 180° in a clockwise direction and a counterclockwise direction about the output shaft of the drive motor based on a straight line passing through the center of the central hole in the connecting portion of the eccentric shaft, in accordance with a required stroke of the piston rod; the rotation angle range setting unit is composed of a stroke adjustment knob and a voltage setting switch that outputs an output voltage according to the rotation of the knob, a control board including a control unit having a memory unit for storing data indicating the relationship between the rotation angle of the base end of the output shaft of the drive motor and the detection output from the rotation angle detection unit, and configured to cause the connecting portion of the eccentric shaft to rotate continuously in a clockwise or counterclockwise direction based on the detection output from the rotation angle detection unit, the rotation angle range set by the rotation angle range setting unit, and the data, and to rotate the connecting portion in both clockwise and counterclockwise directions within a rotation angle range of less than 180° based on a straight line passing through the center of the central hole; a secondary battery for supplying power to the drive motor and the control board; a housing having an accommodating portion that accommodates the stroke adjustment mechanism, the guide sleeve, the rotation angle detection portion, the control board, and the secondary battery; A massage device equipped with a control device for a stroke adjustment mechanism comprising:

4. 4. The massage device equipped with a stroke adjusting mechanism control device according to claim 3, wherein the tolerance of the inner diameter of the guide sleeve relative to the outer diameter of the piston rod is set within a range of +0.2 mm to +0.3 mm.

5. 4. A massage device equipped with a control device for a stroke adjustment mechanism according to claim 3, characterized in that the rotation angle detection unit includes a ring-shaped magnet fixed to the base end of the output shaft of the drive motor, a Hall element substrate having two Hall elements arranged opposite the magnet, and a signal processing unit that processes the detection output signals from the two Hall elements based on the detection output signals to obtain data representing the rotation angle of the output shaft of the drive motor.

6. 2. The control device for a stroke adjusting mechanism according to claim 1, wherein the drive motor is a motor with a brake.

7. 4. The massage device equipped with a control device for a stroke adjusting mechanism according to claim 3, wherein the drive motor is a motor with a brake.

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