JP3176665B2 - Motion direction conversion mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electric massager,
The present invention relates to a motion direction conversion mechanism that can selectively change continuous rotary motion in the same direction of a motor suitable for a shoe polisher, an electric toothbrush, or the like into a linear reciprocating motion or a swing reciprocating motion.

[0002]

In recent years, for example, in the electric toothbrush, as described in JP-63-77 404 discloses electric toothbrush various forms have been developed and presented, such an electric toothbrush, the internal The motor shaft of the motor is connected to the brush mounting shaft via a pinion, a face gear, and a movement direction converting cam portion including a first eccentric cam for linear motion and a second eccentric cam for swing reciprocation. .

[0003] With this configuration, the brush mounting shaft can be selectively linearly moved in the axial direction or oscillated at a fixed angle around the axis by the forward / reverse rotation of the built-in motor.

[0004]

However, the above-described conventional electric toothbrush still has the following problems to be solved.

That is, since the motor used for the electric toothbrush rotates forward and backward by the forward and reverse operation of the operation switch, the wear of the brush becomes remarkably faster than when the motor is rotated only in one direction. Further, since the polarity switching is required, the control circuit is also more complicated than the case where the motor is rotated only in one direction.

[0006] The present invention can solve the above-mentioned problems, and includes the above-described electric toothbrush, electric massager,
An object of the present invention is to provide a motion direction conversion mechanism that can be suitably used for a shoe polisher or the like.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a motion direction conversion mechanism in which an operating body is interlocked to a motor output shaft incorporated in a casing via a motion direction conversion cam section. The eccentric cam is slidably fitted in the oblong opening of the cam cylinder for direction change, and the cam cylinder for direction change is rotated 90 ° by the posture control mechanism to move the cam cylinder in the vertical direction to the horizontal posture. The direction and posture can be selectively adopted, and in each posture position, in conjunction with the rotation of the eccentric cam in the same direction, the direction conversion cam cylinder can be reciprocated vertically or horizontally, and further, in conjunction with the reciprocating motion, the operating shaft, a swinging reciprocable structure around the linear reciprocating motion or axis along its axis, and the appearance
The force control mechanism (35) is provided with a cam cylinder (30) for direction change.
The rotating plate (36), which rotates together,
The lifting frame (37) is configured to move up and down.
The rotation plate (36) is connected to the elevation of the elevation frame (37).
A motion direction converter characterized by being movable and rotatable.
It is related to the structure.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described using an electric toothbrush A shown in the accompanying drawings as an embodiment.

(Overall Configuration of Electric Toothbrush A) First, the overall configuration of the electric toothbrush A according to the present invention will be described with reference to FIG.

As shown in the figure, an electric toothbrush A includes a secondary induction coil 11, a secondary battery 12, and a motor 13 in a long hollow cylindrical casing 10 in order from below to above.
, A motion direction changing cam portion 14 and a brush mounting shaft 15 as an operating body for outputting a reciprocating motion force. A brush body B is detachably mounted on the brush mounting shaft 15.

A motor 13 is provided on the peripheral surface of the casing 10.
And an operation switch 16 for operating the movement direction changing cam portion 14 to move the brush mounting shaft 15 up and down (bus) or rocking (rolling).

And a secondary induction coil of the electric toothbrush A.
By mounting 11 on the primary induction coil of a charger (not shown), the secondary battery 12 is charged.

(Movement Direction Conversion Cam Part 14) Next, the structure of the movement direction conversion cam part 14, which forms the gist of the present invention, will be described with reference to FIGS.

In FIG. 1, a motor 13 disposed in the center of a casing 10 in a state surrounded by a motor casing 20 has a pinion 22 attached to a motor output shaft 21 taken out from above.

A pair of bearing plates 24 and 25 are erected on the upper plate 23 of the motor casing 20 with a parallel space therebetween.
Both ends of the pivot 26 are supported by 24 and 25.

As shown in FIGS. 1 and 7, the pivot 26
A cylindrical gear mounting cylinder 28 having a face gear 27 integrally mounted at one end is rotatably mounted.
Is always meshed with the pinion 22.

An eccentric cam 29 is integrally mounted on the face of the gear mounting cylinder 28 on the face gear 27 side. The axis L ₂ of the eccentric cam 29 is, as shown in FIG. is located at a position eccentric by the eccentricity e from the axis L ₁ of 27).

On the outer peripheral surface of the eccentric cam 29, as shown in FIGS. 1 and 7, an annular direction changing cam receiving cylinder 30 is mounted. The minor axis is substantially equal to the diameter of the eccentric cam 29, and the major axis is a length obtained by adding the diameter of the eccentric cam 29 to at least twice the amount of eccentricity of the eccentric cam 29.

Of course, the oblong opening 31 may have a rectangular shape consisting of a short side and a long side, or a parallel-facing two-walled shape obtained by cutting out the short side.

As shown in FIGS. 1, 7 and 9, the direction changing cam receiving cylinder 30 has a length provided on the same cam receiving cylinder 30 on an end wall 30a opposite to the face gear 27. An oblong opening 32 extending in a direction orthogonal to the circular opening 31 by 90 ° is provided.

The gear mounting shaft 28 passes through the two oblong openings 31 and 32 described above.

The oval opening 32 has a minor axis equal to the diameter of the gear mounting cylinder 28 and a major axis whose length is at least twice the amount of eccentricity of the eccentric cam 29 plus the diameter of the gear mounting cylinder 28. I'm trying.

Further, the cam cylinder 30 for changing the direction is shown in FIG.
As shown in FIGS. 7 and 9, a pair of parallel elongated rectangular cross-section insertion pieces 33, on the end wall 30 a on the opposite side to the face gear 27 and on both sides of the oval opening 32. 34 bases are protruding.

On the extension axis of the direction changing cam receiving cylinder 30, the above-mentioned direction changing cam receiving cylinder 30 is rotated by 90 °,
A cam cylinder attitude control mechanism 35 for selectively adopting the linear reciprocating posture shown in FIG. 7 and the swinging reciprocating posture position shown in FIG. 10 is provided. , Axis
And L ₁ rotation plate 36 of the rotatable disc-like around, engage the rotary plate 36, by the lifting operation, consisting of the lifting frame 37. Gate-shaped rotating the same rotary plate 36.

The rotary plate 36 is inserted into the insertion piece 3 having the above-described long rectangular cross section at the position of the linear reciprocating movement in FIG.
A pair of oblong openings 38 and 39 through which the holes 3 and 34 can be inserted are provided. The oblong openings 38 and 39 have their short diameters equal to the widths of the insertion pieces 33 and 34 and their long diameters at least twice the eccentric amount of the eccentric cam 29. Length.

The rotating plate 36 has a shaft hole 40 at the center thereof, which penetrates the gear mounting cylinder 28 described above.

Further, the rotating plate 36 is provided with stopper pieces 41, 42, 43, 44 at every 90 ° on the outer peripheral edge thereof.
In side view, the stopper pieces 42 and 44 and the stopper piece 4
The stopper pieces 42 and 44 are used for linear reciprocating motion (bus), and the stopper pieces 41 and 43 are used for swing reciprocating motion (rolling).

The lifting frame 37 includes a pair of vertical frame members 37a, 37b.
Are connected by a U-shaped upper horizontal frame member 46. In order to prevent the U-shaped vertical frame members 37a and 37b from expanding and deforming, the lower ends are connected to form a square.

On the inner surfaces of the vertical frame members 37a, 37b, stopper pieces 41, 42, 42 provided on the outer peripheral surface of the rotating plate 36 are respectively linked with the lifting operation of the lifting frame 37.
Stopper pieces 47, 48, 49, 50 which can be engaged with 43, 44 are provided.

In FIG. 7, reference numerals 37c and 37d denote a pair of elevating guide pieces 37c and 37d provided on both side surfaces of the vertical members 37a and 37b of the elevating frame 37. As shown in FIG.
It is arranged to be able to move up and down within the gap between the 24 and 25 joints.

With this configuration, as shown in FIG.
All of the stopper pieces 47, 48, 49, and 50 provided on the lifting frame 37 are the stopper pieces 41, 42, and 4 provided on the rotating plate 36.
In the off position not engaged with any of 3, 44, rotating plate 36 is in a free rotation state.

However, from this off position, the lifting frame 37
Is moved up by one step, the stopper pieces 4 and 4 of the rotating plate 36 are respectively placed on the upper stopper pieces 47 and 48 of the lifting frame 37.
12, 44 engage to stop the rotation of the rotating plate 36, and FIG.
And the linear reciprocating (bus) position shown in FIG.

Further, the lifting frame 37 is moved from this bus position.
When the rotary plate 36 is raised one more stage, the rotating plate 36 is slightly pushed back and reversely rotated, and the engagement between the upper stopper pieces 47 and 48 of the lifting frame 37 and the stopper pieces 42 and 44 of the rotating plate 36 is released. The rotating plate 36 rotates in the direction a, and the lower stopper pieces 49, 50
Then, the stopper pieces 41 and 43 of the rotating plate 36 are engaged with each other to stop the rotation of the rotating plate 36, and FIGS.
It will be held in the swinging reciprocating (rolling) position shown in Fig. A movement direction restricting ring 51 is further provided on the extension of the axis of the above-described cam receiving cylinder attitude control mechanism 35, and the direction restricting ring 51 is provided on both side surfaces thereof. There are provided concave grooves 52, 53 for fitting and supporting the 30 insertion pieces 33, 34.

The movement direction restricting ring 51 is provided with an oblong opening 54 in a direction orthogonal to the oblong opening 31 of the direction changing cam receiving cylinder 30. The mounting cylinder 28 penetrates.

The oblong opening 54 has a minor axis equal to the diameter of the gear mounting cylinder 28 and a major axis whose length is at least twice the amount of eccentricity of the eccentric cam 29 plus the diameter of the gear mounting cylinder 28. I'm trying.

Further, the direction restricting ring 51 is fitted into the annular ring 55 that forms a concentric circle, and, in order to allow swinging about the axis L _1, in a side view, a convex cross-sectional shape Have.

The annular ring 55 has its upper part fixed to the tip of an eccentric bracket 56 integrally fixed to the lower end of a brush mounting shaft 15 extending in a vertical direction. Are rotatably or slidably supported by a bearing body 15a.

(Structure of Operation Switch 16) As shown in FIGS. 1 and 6, the operation switch 16 has guide rods 60, 6 projecting from the front surface of the upper horizontal frame member 46 of the lifting frame 37 at intervals.
1 is passed through the vertically long holes 62, 63 provided in the one-side bearing plate 25, the penetrating end thereof is connected to the lifting plate 64, and the contact plate 65 is attached to the back surface of the lifting plate 64,
A contact spring 66 for turning on / off the motor 13 is provided above and below the lifting plate 64 in conjunction with the lifting and lowering operation of the lifting plate 64, and the motor 13 is connected to the switch knob 67. It is constituted by doing.

With this configuration, at the solid line position shown in FIG. 6, the motor 13 does not rotate even though the contact plate 65 and the contact spring 66 are separated. On the other hand, at the two raised positions indicated by phantom lines in FIG. 6, the contact plate 65 and the contact spring 66 are connected, and the motor 13 rotates in one direction.

(Operation of the Motion Direction Conversion Cam Part 14) In the off state, as described with reference to FIG. 11, all of the stopper pieces 47, 48, 49, and 50 provided on the lifting frame 37 are rotated by the rotating plate 36. Are not engaged with any of the stopper pieces 41, 42, 43, 44 provided in the above.

Next, linear reciprocating motion of the brush attachment shaft 15 to linear motion by the axis L _3, i.e., case of the bus, as shown in FIG. 6, a bus an elevating plate 64 by operating the switch knob 67 Ascend to position.

As a result, the contact plate 65 is
To rotate the motor 13 in one direction.

By the rotation of the motor 13, the pinion 22 of the motor 13 rotates in a certain direction a, and the face gear 27, the gear mounting cylinder 28 and the eccentric cam 29 which are integral with the pinion 22 also rotate in the same direction a.

By the rotation of the eccentric cam 29, the outer peripheral surface of the eccentric cam 29 comes into contact with the inner peripheral surface of the direction changing cam receiving cylinder 30, and the direction converting cam receiving cylinder 30 also moves in the same direction a by the contact frictional force. Start rotating.

On the other hand, as the lifting plate 64 rises to the bath position, the upper stoppers 48, 49 of the lifting frame 37 rise integrally, and the stopper pieces 42, 44 of the rotating plate 36 engage, respectively. Stop the rotation of the rotating plate 36,
The rotating plate 36 moves linearly as shown in FIGS. 12 and 13.
(Bus) position.

Accordingly, the rotating plate 36 and the pair of insertion pieces 3
The direction changing cam receiving cylinder 30 integrally rotatably connected by the three and 34 is also held at the horizontal posture position shown in FIG.

[0047] Thus, the revolution in one direction a about the axis L ₁ of the eccentric cam 29 will be reciprocated the direction conversion cam bushing 30 in the vertical direction.

When the direction changing cam receiving cylinder 30 assumes the horizontal posture shown in FIG. 7, the elliptical opening 31 extends in the horizontal direction.
The eccentric cam 29 only slides in the vertical direction.
Does not generate a force to move the cam direction changing cam receiving cylinder 30 in the left-right direction.

[0049] As a result, the revolution in one direction a about the axis L ₁ of the eccentric cam 29 is integrally reciprocated in the vertical direction movement direction restricting ring 51 which is connected to the cam bushing 30 and its rear for redirecting Will be.

[0050] Incidentally, in the direction of movement restricting ring 51, the annular ring 55 integral with the brush attachment shaft 15 is fitted, the brush attachment shaft 15, to linear reciprocating motion along its axis L ₃ Can be.

Accordingly, the brush body B mounted on the brush mounting shaft 15 can also perform a linear reciprocating movement, that is, a bath.

Next, the case where the brush mounting shaft 15 is reciprocally oscillated, that is, rolled , around the axis L3 will be described.

In this case, as shown in FIG. 6, when the elevating frame 37 is raised one more step to bring it to the rolling position from the bus position, the rotating plate 36 is slightly moved in the direction opposite to the one rotation direction a. , And lift frame 37
The engagement between the upper stopper pieces 48, 50 and the stopper pieces 42, 44 of the rotating plate 36 is released. Thereafter, the rotating plate 36 rotates again in the rotating direction a, and the stopper pieces 41, 43 of the rotating plate 36 engage with the lower stopper pieces 47, 49 of the elevating frame 37, respectively, thereby stopping the rotation of the rotating plate 36. Then, it is held at the swinging reciprocating (rolling) position shown in FIGS.

In this case, in FIG. 4, when the pinion 22 of the motor 13 is rotated in the clockwise direction a, the face gear 27, the gear mounting cylinder 28 and the eccentric cam 29 which are integral therewith also rotate in the clockwise direction a.

By the rotation of the eccentric cam 29, the outer peripheral surface of the eccentric cam 29 comes into contact with the inner peripheral surface of the direction changing cam receiving cylinder 30, and the direction converting cam receiving cylinder 30 is moved clockwise by the contact frictional force. Try to rotate.

Accordingly, the rotating plate 36 and the pair of insertion pieces 3
The direction-changing cam receiving cylinder 30 integrally rotatably connected by 3, 34 is also held in the vertical posture position shown in FIG.

[0057] Thus, the revolution in one direction a about the axis L ₁ of the eccentric cam 29 will be reciprocated the direction conversion cam bushing 30 in the lateral direction.

When the direction changing cam receiving cylinder 30 assumes the vertical posture shown in FIG. 10, the elliptical opening 31 extends in the vertical direction.
The eccentric cam 29 only slides in the vertical direction.
Does not generate a force to move the cam direction changing cam receiving cylinder 30 in the vertical direction.

[0059] As a result, the revolution in one direction a about the axis L ₁ of the eccentric cam 29 has an outer direction of movement restriction ring 51 and the movement direction restricting ring 51 coupled to the cam bushing 30 and its rear for redirecting The fitted annular ring 55 reciprocates integrally in the left-right direction.

By the way, the annular ring 55 is
Because of being disposed at a position eccentric from the axis L _3, the right and left reciprocating motion of the annular ring 55, the brush attachment shaft 15 can swing back and forth motion along its axis L _3.

Therefore, the brush body B mounted on the brush mounting shaft 15 can also swing and reciprocate, that is, roll.

Although not shown, as another embodiment of the electric toothbrush A according to the present invention, not only the bus stopper and the rolling stopper but also the rotating plate 36 are provided on the inner surface of the lifting frame 37 and the rotating plate 36. Can be provided in a horizontal / vertical synthetic reciprocating motion capable of holding the brush body in an inclined direction. In this case, it is possible to make the brush body B perform a complex motion of a linear reciprocating motion and a swing reciprocating motion. it can.

In each of the above embodiments, the means for controlling the stop position of the rotating plate 37 is
Although the lifting frame 37 that moves up and down in the tangential direction of 37 was used,
A member that retreats in the axial or radial direction of the rotating plate 37 and selectively engages with the stopper pieces 41, 42, 43, 44 may be used. Only the side may be stopped.

[0064]

As described above, according to the present invention, the movement direction changing cam portion of the movement direction changing mechanism is connected with the eccentric cam to the output shaft of the motor, and the eccentric cam is connected to the oval oval cylinder. It is slidably fitted into the opening, and the cam cylinder for the same direction conversion is rotated 90 ° by the posture control mechanism to selectively take the vertical posture and the horizontal posture. In conjunction with the rotation of the cam in the same direction,
The direction changing cam cylinder can be reciprocated vertically or horizontally, and in conjunction with the reciprocating motion, the operating body is linearly reciprocated along its axis or reciprocated swinging around the axis. It has a possible configuration.

As described above, while the motor is continuously rotated in one direction, the operating body can be linearly reciprocated along the axis thereof or rocked and reciprocated about the axis.
Motor brush wear can be prevented as much as possible,
The life of the motor can be extended.

Further, since the forward / reverse operation of the motor can be dispensed with, the polarity switching is not required, the control circuit can be simplified, the production can be performed at low cost, and the number of failures can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional front view of an electric toothbrush incorporating a movement direction conversion mechanism according to the present invention.

FIG. 2 is a cross-sectional view taken along line II of FIG.

FIG. 3 is an explanatory diagram of a fitting state of an eccentric cam and a direction conversion cam receiving cylinder.

FIG. 4 is a cross-sectional view taken along line II-II of FIG.

FIG. 5 is a sectional view taken along line III-III in FIG. 1;

FIG. 6 is a perspective view showing a connection state between an attitude control mechanism and an operation switch.

FIG. 7 is an exploded perspective view of a movement direction changing cam portion at a bus position.

FIG. 8 is a front view of the face gear.

FIG. 9 is a cross-sectional side view of the cam cylinder for direction change.

FIG. 10 is an exploded perspective view of a movement direction changing cam portion at a rolling position.

FIG. 11 is an explanatory diagram showing an engagement state between a rotating plate and a lifting frame at an off position.

FIG. 12 is an explanatory diagram showing an engagement state between a rotating plate and a lifting frame at a bus position.

FIG. 13 is an explanatory diagram showing an engagement state between a rotating plate and a lifting frame at a bus position.

FIG. 14 is an explanatory diagram showing an engagement state between a rotating plate and a lifting frame at a rolling position.

FIG. 15 is an explanatory diagram showing an engagement state between a rotating plate and a lifting frame at a rolling position.

[Explanation of symbols]

 A Electric toothbrush B Brush body 10 Casing 13 Motor 14 Motion direction conversion cam part 15 Brush mounting shaft 22 Pinion 26 Axis 27 Face gear 28 Gear mounting cylinder 29 Eccentric cam 30 Direction conversion cam receiving cylinder 31 Oval opening 32 Oval opening 33 Inserting piece 34 Inserting piece 35 Attitude control mechanism 36 Rotating plate 37 Elevating frame

Claims (1)

(57) [Claims] An eccentric cam (29) is connected to an output shaft of a motor (13) in a movement direction conversion mechanism in which an operating body is interlocked to an output shaft of a motor (13) via a movement direction conversion cam section (14). The eccentric cam (29) is slidably fitted into the oblong opening (31) of the direction changing cam receiving cylinder (30), and the eccentric cam (29) is slidably fitted to the attitude controlling mechanism. By rotating the eccentric cam (29) in the same direction by rotating the eccentric cam (29) in the same direction at each position by rotating the eccentric cam (29) in the vertical direction and the horizontal direction by rotating by 90 ° by (35),
The direction changing cam receiving cylinder (30) is capable of reciprocating in the vertical or horizontal direction, and in conjunction with the reciprocating movement, the operating body is linearly reciprocated along the axis thereof or swung about the axis. It is configured to be capable of reciprocating motion , and the above attitude control
The mechanism (35) is integrated with the direction changing cam receiving cylinder (30).
Rotating plate (36) that rotates to move up and down by operation
And a rotating frame (37).
The port (36) is linked with the elevation of the lifting frame (37).
A motion direction conversion mechanism characterized by being rotatable.