JPH09177923A - Moving direction converting mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the size management of an eccentric cam, by operating an operating body in a linear reciprocating movement along an axial line, and in a fluctuation reciprocating movement around the axial line freely, by rotating the eccentric cam regularly and reversely at the posture positions respectively, through a cam receiving tube for converting the direction. SOLUTION: The revolving motion in the counterclockwise direction b around the axial line L1 of an eccentric cam 29 is to make a cam receiving tube 30 for direction converting, and a circular ring 35 installed to the outer peripheral surface of the cam receiving tube 30, carry out the reciprocating movement in the lateral direction integrally. And in this case, a fitting shaft 39 provided on the upper side of the circular ring 35 carries out the reciprocating movement in the lateral direction together with the circular ring 35, but since the fitting shaft 39 is inserted to the cutting hole 42 of an eccentric bracket 41, a brush body installed to a brush installing shaft 15 is fluctuation rotated around the axial line L3 .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an electric massager,
The present invention relates to a movement direction conversion mechanism capable of selectively changing the rotational movement of a motor suitable for a shoe polisher, an electric toothbrush or the like into a linear reciprocating movement and a swing reciprocating movement.

[0002]

2. Description of the Related Art In recent years, for example, electric toothbrushes have been developed and presented in various forms as described in Japanese Patent Application Laid-Open No. 63-77404, and such electric toothbrushes have a motor with a built-in motor. The shaft is connected to a brush mounting shaft as an actuating body via a pinion, a face gear, and a motion direction changing cam portion including a first eccentric cam for linear motion and a second eccentric cam for swing reciprocating motion. ing.

With such a structure, the brush mounting shaft can be selectively moved linearly in the axial direction or can be oscillated around the axis at a constant angle by the forward and reverse rotations of the built-in motor.

[0004]

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

That is, in this electric toothbrush, the movement direction changing cam portion is formed by coaxially integrally molding the first eccentric cam for linear movement and the second eccentric cam for swinging reciprocating movement. Since a large cam surface is required, dimensional control of the eccentric cam at the part manufacturing stage has been complicated.

Further, in order to enable the conversion operation of the movement direction conversion cam portion by the forward / reverse rotation of the built-in motor, the first linear motion mounted on the small eccentric shaft attached to the face gear.
A narrow thread protrusion is provided in the eccentric cam, and the thread protrusion is capable of contacting a fine protrusion engagement surface provided on a small eccentric shaft. However, since a considerable moment is applied to the filamentous protrusions that are brought into contact with the protrusion engagement surfaces, the filamentous protrusions may be sagged or damaged, and the filamentous protrusions may get over without coming into contact with each other.

An object of the present invention is to provide a motion direction changing mechanism which can solve the above problems.

[0008]

According to the present invention, in a motion direction changing mechanism in which an operating body is interlockingly connected to an output shaft of a motor 13 via a motion direction changing cam part 14, the motion direction changing cam part 14 is connected to the motor. An eccentric cam 29 is interlockingly connected to the output shaft 21 of the shaft 13, and the eccentric cam 29 is slidably fitted in the oval opening 31 of the direction changing cam receiving cylinder 30.
The direction-changing cam receiving cylinder 30 is rotated by a predetermined angle in conjunction with the normal and reverse rotations of FIG. 1 to selectively take a vertical posture and a horizontal posture, and the eccentric cam 29 is rotated forward and backward at each posture position. The direction-changing cam receiving cylinder 30 is reciprocally movable in the vertical direction or the horizontal direction, and the reciprocating motion allows the actuating body to be linearly reciprocated along the axis or reciprocally oscillated around the axis. The present invention relates to a motion direction changing mechanism having a configuration.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to an embodiment shown in the accompanying drawings by taking an electric toothbrush as an example.

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

As shown in the figure, the electric toothbrush A has a secondary hollow induction coil 11, a secondary battery 12, a motor 13 and a motor 13 in order from the bottom to the top in a long hollow cylindrical casing 10. The movement direction changing cam portion 14 and the brush mounting shaft 15 are built in, and the brush mounting shaft 1 as an operating body
A brush body (not shown) is detachably attached to the unit 5.

Further, on the peripheral surface of the casing 10, the motor 13 and the secondary battery 12 are turned on and off, the forward and reverse polarities are switched, and the motion direction changing cam portion 14 is operated to operate the brush mounting shaft. An operation switch 16 for vertically moving (bus) or swinging (rotary) 15 is attached to 15.

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

(Movement direction changing cam portion 14) Next, the structure of the movement direction changing cam portion 14 forming the subject of the present invention will be described with reference to FIGS.
This will be described with reference to FIG.

In FIG. 1, a motor 13 arranged in a central portion of a casing 1 so as to be surrounded by a motor casing 20 has a motor output shaft 2 taken out from above.
The pinion 22 is attached to 1.

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

As shown in FIGS. 1, 3 and 4, a cylindrical gear mounting cylinder 28 having a face gear 27 integrally mounted at one end is rotatably mounted on the pivot shaft 26. The gear 27 always meshes with the pinion 22.

An eccentric cam 29 is integrally mounted on the face gear 27 side of the gear mounting shaft 28, and the axis line L2 of the eccentric cam 29 is, as shown in FIG.
It is located at a position eccentric by an eccentric amount e from the axis L1 of the (face gear 27).

On the outer peripheral surface of the eccentric cam 29, as shown in FIG. 4, an annular direction-changing cam receiving cylinder 30 is mounted, and the oval opening 31 of the cam receiving cylinder 30 has a short length. The eccentric cam 2 has a diameter equal to that of the eccentric cam 29, and its major axis is at least twice the eccentric amount of the eccentric cam 29.
The length is 9 plus the diameter.

As shown in FIG. 4, FIG. 6 and FIG. 7, the cam receiving cylinder 30 has a direction regulating ring 32 integrally attached to the end face which is opposite to the face gear 27. The ring 32 has an oval opening 33 extending in a direction orthogonal to the oval opening 31 provided on the eccentric cam 29 by 90 °.

In the oval opening 33, the gear mounting shaft 2 described above is provided.
8 is inserted. Then, the same elliptical opening 33 has a minor axis equal to the diameter of the gear mounting cylinder 28, and
The major axis is at least twice the eccentric amount of the eccentric cam 29 plus the diameter of the gear mounting cylinder 28.

Further, the direction restricting ring 31 is provided with 180 degrees on one outer peripheral edge in the direction orthogonal to the above-mentioned oval opening 33.
A first arcuate stopper 34 is provided at a circumferential angle of °.

An annular ring 35 is fitted on the direction restricting ring 31, and the annular ring 35 is provided with a 90 ° second arcuate stopper 36 on its inner peripheral surface. The stopper 36 is the direction-changing cam receiving tube 3
By turning 0, either end 36a, 36b
Can contact any one of the end portions 34a and 34b of the first arcuate stopper 34 having a circumferential angle of 180 ° described above.

These first and second arcuate stoppers 34,
The formation position of 36 may be provided at any position on each circumferential surface, and the minor diameter of the elliptical opening 31 of the direction changing cam receiving cylinder 30 is the same direction as the brush mounting shaft 15 and the direction orthogonal thereto. It suffices if it can be positioned between them. Moreover, each stopper 3
Reference numerals 4 and 36 denote end portions 36a, 36b, 34a and 34, respectively.
It suffices if b is present, and an arc-shaped intermediate portion is not particularly required, and for example, a rib-shaped intermediate portion is also possible.

In the above embodiment, the first arcuate stopper 34 is provided with the end portions 34a and 34b at the peripheral edge in the direction orthogonal to the major axis of the oval opening 33, so that the distance from the oval opening 33 is increased. It is sufficiently expanded to suppress the influence of deformation or the like on the oval opening 33 due to the impact force at the time of contact.

As shown in FIG. 4, the annular ring 35 has, at its upper end, bracket retaining pieces 37 and 38 formed of a pair of rectangular plates and both bracket retaining pieces 37 and 38.
And a brush mounting shaft engaging portion 40 that is formed by a fitting shaft 39 that connects the two.

On the other hand, the brush mounting shaft 1 extending in the vertical direction
As shown in FIG. 4, a basal end of a rectangular plate-shaped eccentric bracket 41 is attached to the lower end of the eccentric bracket 5, and the eccentric bracket 41 is fitted at a tip position eccentric from the axis L3 of the brush mounting shaft 15. A notch groove 42 having a width substantially equal to the diameter of the shaft 39 is provided, and the notch groove 42 extends and opens in the radial direction from the axis L3.

Then, in the notch groove 42, the annular ring 3
The fitting shaft 39 provided on the upper part of the No. 5 is fitted.

In FIG. 4, reference numeral 43 denotes a sliding disk integrally provided on one end face of the face gear 27, and the end face of the direction changing cam receiving cylinder 30 facing the end face on the same side includes:
A sliding resistance reducing member 44 that also serves as a position regulating spacer is provided.

(Operation of the movement direction changing cam portion 14) First,
A swing reciprocating motion for swinging the brush mounting shaft 15 around its axis, that is, rolling will be described.

In this case, in FIG. 4, when the pinion 22 of the motor 13 is rotated in the counterclockwise direction b, the face gear 27, the gear mounting cylinder 28 integral with the face gear 27, and the eccentric cam 2 are formed.
9 also rotates counterclockwise b.

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 contact friction force causes the direction changing cam receiving cylinder 3 to move.
0 also tries to rotate in the counterclockwise direction b, but as shown in FIG. 6, one end of the first arc-shaped stopper 34 provided on the peripheral surface of the direction regulating ring 32 provided at one end of the direction changing cam receiving cylinder 30. Since 34a is in contact with one end 36a of the second arcuate stopper 36 provided on the inner surface of the annular ring 35, the direction-changing cam receiving cylinder 30 moves in the counterclockwise direction b in FIG. 4 (in FIG. 6, the annular ring 35). It does not rotate clockwise because it is viewed from the side), and the vertical posture shown in FIG. 4 is maintained.

Therefore, the revolution movement of the eccentric cam 29 around the axis L1 in the counterclockwise direction causes the direction-changing cam receiving cylinder 30 to reciprocate in the left-right direction.

When the direction changing cam receiving cylinder 30 is in the vertical posture shown in FIG. 4, the oval opening 31 extends in the vertical direction, so that the eccentric cam 29 rotates in the oval opening 31. Since the eccentric cam 29 is rotated, the cam receiving cylinder 30 for changing the cam direction can be slid in the vertical direction.
No force is generated to move the up and down directions.

As a result, the counterclockwise revolving movement of the eccentric cam 29 about the axis L1 causes the reciprocating cam receiving cylinder 30 and the annular ring 35 fitted to the outer peripheral surface thereof to reciprocate integrally in the left-right direction. I will let you.

By the way, the fitting shaft 39 provided on the upper part of the annular ring 35 reciprocates in the left-right direction together with the annular ring 35, but since the fitting shaft 39 is fitted in the notch groove 42 of the eccentric bracket 41, The mounting shaft 15 can swing and rotate about its axis L3.

Therefore, the brush body B mounted on the brush mounting shaft 15 can also be oscillated and rotated, that is, rolled.

Next, a linear reciprocating motion, that is, a bus, which causes the brush mounting shaft 15 to reciprocate in the vertical direction along its axis will be described.

In this case, in FIG. 4, when the pinion 22 of the motor 13 is rotated clockwise a, the face gear 2
7, and the gear mounting cylinder 28 and the eccentric cam 29, which are integrated with 7, 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 contact friction force causes the direction changing cam receiving cylinder 3 to move.
Attempt to rotate 0 in the clockwise direction a.

By the way, as shown in FIG. 4, the other end 34b of the first arcuate stopper 34 provided on the circumferential surface of the direction regulating ring 32 provided at one end of the direction changing cam receiving cylinder 30 has an inner surface of the annular ring 35. Since it is not in contact with the other end 36b of the second arcuate stopper 36 provided in the direction changing cam receiving cylinder 30 and the direction changing cam receiving cylinder 30 by the contact frictional force between the eccentric cam 30 and the direction changing cam receiving cylinder 30 described above. The first arcuate stopper 34, which is integrated, rotates in the clockwise direction a.

Then, as shown in FIG. 7, the other end 34b of the first arcuate stopper 34 abuts the other end 36b of the second arcuate stopper 36 in a state of being rotated by 90 °, and the direction changing cam receiving cylinder As shown in FIG. 8, the reference numeral 30 moves in a horizontal posture rotated by 90 ° from the vertical posture shown in FIG.
It will maintain the same posture.

Therefore, the revolving motion of the eccentric cam 29 about the axis L1 in the clockwise direction a reciprocates the direction-changing cam receiving cylinder 30 in the vertical direction.

When the direction changing cam receiving cylinder 30 is in the posture shown in FIG. 8, the oval opening 31 extends in the horizontal direction, so that the eccentric cam 29 rotates in the oval opening 31.
A force for moving the direction-changing cam receiving cylinder 30 in the vertical direction is not generated only by sliding the inside in the horizontal direction.

As a result, the revolving motion of the eccentric cam 29 about the axis L1 in the clockwise direction a causes the direction-changing cam receiving cylinder 30 and the annular ring 35 fitted to the outer peripheral surface thereof to reciprocate integrally in the vertical direction. It will be.

By the way, the brush mounting shaft engaging portion 40 provided on the upper portion of the annular ring 35 reciprocates in the vertical direction together with the annular ring 35, but the eccentric bracket 41 serves as the upper and lower rectangular plate pieces of the brush mounting shaft engaging portion 40. The eccentric bracket 41 and the brush mounting shaft 15 which is integral with the eccentric bracket 41 reciprocate in the vertical direction along the axis L3 because the eccentric bracket 41 and the brush mounting shaft 15 are supported by the stoppers 37 and 38 in the vertical direction.

Therefore, the brush body B mounted on the brush mounting shaft 15 can also reciprocate in the vertical direction, that is, perform a bath.

In order to rotate the eccentric cam 29 in the forward and reverse directions, the polarity of the DC motor 13 is switched, and an idle gear is turned on and off between the output shaft 21 of the motor 13 and the face gear 27 to interlock them. However, in this case, since the polarity of the motor 13 is not switched and the motor 13 is rotated only in one direction, the life of the motor 13 can be extended.

[0049]

As described above, according to the present invention, the movement direction changing cam portion of the movement direction changing mechanism is linked to the output shaft of the motor in conjunction with the eccentric cam, and the eccentric cam has the oval shape of the direction changing cam receiving cylinder. It is slidably fitted in the opening, and in conjunction with the forward and reverse rotation of the eccentric cam, the direction-changing cam receiving barrel is rotated by a predetermined angle to selectively take a vertical posture and a horizontal posture. In this posture position, the eccentric cam can be reciprocally moved in the vertical or horizontal direction by rotating the eccentric cam forward and backward, and by the reciprocating motion, the actuating body can be linearly reciprocated along the axis. Alternatively, it is configured to be capable of swinging and reciprocating about an axis.

As described above, since the movement direction changing cam portion uses only one eccentric cam which requires a precise cam surface, the eccentric cam size control can be facilitated at the component manufacturing stage, and the movement direction changing cam portion can be manufactured at a low cost. Can be manufactured.

Further, in order to enable the movement direction conversion operation by the forward and reverse rotations of the motor, the first and second arcuate stoppers provided on the direction regulating ring and the annular ring respectively have a sufficient thickness in the circumferential direction. , Even if they come into contact with each other, they are not damaged, and forward and reverse rotations of the motor are reliably transmitted to the actuating body through the movement direction changing cam portion, so that the actuating body performs linear reciprocating motion or oscillating reciprocating motion. You can

[Brief description of the drawings]

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

FIG. 2 is a side view showing one side of the electric toothbrush without a casing.

3 is a cross-sectional view taken along the line I-I of FIG.

FIG. 4 is an exploded perspective view of a movement direction changing cam portion at a rolling position.

5 is an arrow view of the face gear taken along line II-II of FIG.

FIG. 6 III-III of FIG. 4 in rolling position
It is an arrow line view of a direction control ring and an annular ring by a line.

7 is an arrow view of the direction regulating ring and the annular ring taken along the line III-III in FIG. 4 in the bus position.

FIG. 8 is an exploded perspective view of a movement direction changing cam portion at a bus 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 25 face gear 26 pivot shaft 28 gear mounting shaft 29 eccentric cam 30 direction conversion cam receiving barrel 31 oval opening 32 direction regulating ring 33 Oval opening 34 First arc stopper 35 Annular ring 36 Second arc stopper 37 Bracket retaining piece 39 Fitting shaft 41 Bracket 42 Notch groove

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location F16H 35/00 7456-3K A46B 13/02 700

Claims (6)

[Claims] 1. A motion direction conversion mechanism in which an operating body is interlocked with an output shaft of a motor 13 via a motion direction conversion cam part 14, wherein the motion direction conversion cam part 14 is eccentric to an output shaft 21 of the motor 13. Eccentric cam 29
Is slidably fitted in the oval opening 31 of the direction-changing cam receiving barrel 30, and the direction-changing cam receiving barrel 30 is rotated by a predetermined angle in association with the forward / reverse rotation of the eccentric cam 19 to rotate in the vertical direction. The posture and the horizontal posture are selectively adopted, and at each posture position, the direction-changing cam receiving cylinder 30 can be reciprocated in the vertical direction or the horizontal direction by the forward and reverse rotations of the eccentric cam 29. , By the same reciprocating motion,
A motion direction conversion mechanism having a structure capable of linear reciprocating motion along an axis or oscillating reciprocating motion around an axis. 2. A motor 13 built in the casing 10.
Attach the pinion 22 to the upper output shaft of the
Similarly, in a motion direction conversion mechanism in which the motion direction conversion cam unit 14 is interlockedly connected to the actuating body via the motion direction conversion cam unit 14 built in the casing 10, the motion direction conversion cam unit 14 is a) meshed with the pinion 22 in an orthogonal state. Face gear 2
5) b) an eccentric cam 29 integrally attached to the face gear 25 and having its axis L2 eccentric from the axis L1 of the face gear 25, and c) the eccentric cam 29 is slidable in the longitudinal direction. Direction changing cam receiving cylinder 30 having an oval opening 31 surrounding the
And d) integrally attached to one end of the direction changing cam receiving cylinder 30,
A direction regulating ring 32 having a first arcuate stopper 34 on the outer peripheral surface, and e) fitted on the outer peripheral surface of the direction regulating ring 32, and on the inner peripheral surface thereof, the direction regulating ring 32 rotates in the same direction. An annular ring 35 provided with a second arc stopper 36 that can selectively contact both ends of the first arc stopper 34 of the restriction ring 32; and f) Attached to the upper end of the annular ring 35, and at least the bracket is retained at the upper end. And a eccentric bracket 41 having a notch groove 42 which is attached to the base end of the actuating body and which is fitted into the actuating body at a position eccentric from the axis L3 of the actuating body. A movement direction conversion mechanism characterized by the above. 3. A motor 13 built in the casing 10.
Attach the pinion 22 to the upper output shaft of the
In a motion direction conversion mechanism in which the motion direction conversion cam part 14 is interlocked and connected to the actuating body via the motion direction conversion cam part 14 also incorporated in the casing 10, the motion direction conversion cam part 14 is a) above the pinion 22. And a face gear 25 that is rotatably attached to one end of the pivot shaft 26 via a gear attachment cylinder 28 and meshes with the pinion 22 in the horizontal direction orthogonal to the axis line of. C) An eccentric cam 29 integrally attached to the face gear 25 and having its axis L2 eccentric from the axis L1 of the gear mounting shaft 28, and d) the eccentric cam 29 is slidable in the longitudinal direction. A direction-changing cam barrel 30 having an oval opening 31 surrounding it
And e) integrally attached to one end of the direction changing cam receiving cylinder 30,
A direction regulating ring which is provided with a first arcuate stopper 34 of 180 ° on the outer peripheral surface and is provided with an elliptical opening 33 surrounding the gear mounting cylinder 28 in a direction orthogonal to the elliptical diameter opening 31 in the central portion. 32, and f) is fitted on the outer peripheral surface of the direction restricting ring 31 and is rotated by 90 ° on the inner peripheral surface of the direction restricting ring 32 by the first arcuate stopper 34 of the direction restricting ring 32. An annular ring 35 provided with a second circular arc stopper 36 capable of selectively abutting both ends of the annular ring 35, and g) a fitting shaft 39 attached to the upper end of the annular ring 35 and provided with a bracket retaining piece 37 at least at the upper end, h) An eccentric bracket 41 having a notch groove 42 attached to the base end of the actuating body and fitted with the fitting shaft 39 at a position eccentric from the axis L3 of the actuating body. Direction conversion mechanism. 4. The oval opening 3 of the direction changing cam receiving cylinder 30.
1 is equal to the diameter of the eccentric cam 29, and
4. The motion direction changing mechanism according to claim 3, wherein the major axis of the opening 31 is at least twice the eccentric amount of the eccentric cam 29 plus the diameter of the eccentric cam 29. 5. The minor diameter of the elliptical opening 33 of the direction regulating ring 32 is made equal to the diameter of the gear mounting cylinder 28, and the major diameter of the opening 33 is at least 2 of the eccentric amount of the eccentric cam 29.
4. The movement direction changing mechanism according to claim 3, wherein the length is set to double the diameter of the gear mounting cylinder 28. 6. The movement direction changing mechanism according to claim 1, wherein the actuating body is a brush mounting shaft of an electric toothbrush.