JPH09229157A - Reciprocative rotation mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make reciprocative rotation slowly and quickly without changing the size of the mechanism by performing the reciprocative rotational motions with the mesh of gears. SOLUTION: A reciprocative rotation mechanism concerned comprises a drive part 1 having an output shaft 1a, the first rotor 2 mounted on the output shaft 1a and equipped consolidatedly with a whole circumference gear 2a formed concentricallv with the output shaft 1a and an arc-shaped gear 2b installed coaxially with the whole gear 2a and provided in an extent not exceeding one half of the whole circumference, the second rotor 3 equipped consolidatedly with a whole circumference gear 3a to mesh with the whole circumference gear 2a of the first rotor 2 and an arc-shaped gear 3b installed coaxially with the whole gear 3a and provided in an extent not exceeding one half of the whole circumference, and a third rotor 4 having a gear to mesh with the gear 2b of the first rotor 2 and the one 3b of the second rotor 3. With rotation of the output shaft 1a made by the above-mentioned drive part 1, the third rotor 4 meshes selectively with the gear 2b of the first rotor 2 and the one 3b of the second rotor 3 so that the regular rotation and reverse rotation are made alternately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating rotary mechanism that converts a unidirectional rotary motion into reciprocating rotary motion.

[0002]

2. Description of the Related Art For example, a link mechanism, a cam mechanism, a magnet is used as a reciprocating rotation mechanism used for reciprocally rotating a decorative body provided in a watch, a display installed in a show window, a product, an advertising medium, or the like. A mechanism using an electromagnetic coil is known.

In each of these mechanisms, in order to slow down the reciprocating rotation speed to slow down the reciprocating rotating operation of the ornament or the like, or vice versa, the one using a motor is basically used. It is performed by changing the rotation speed of the motor,
In the link mechanism, the length of the link is changed to adjust the forward / reverse speed, and in the cam mechanism, the size of the cam and the cam groove is changed. Furthermore, in the case of a mechanism using a magnet and an electromagnetic coil, these It will be performed by adjusting the size and the energizing current.

[0004]

As described above, in the reciprocating rotating mechanism generally used in the past, in order to change the reciprocating rotating speed, in particular, to change the reciprocating rotating operation of the ornament or the like slowly, Resizing of components is done. Therefore, in a normal case where the reciprocating rotation mechanism is housed in a fixed space, it is difficult to increase the size of the mechanism.

Therefore, in the present invention, the mechanism for reciprocating rotation is performed by a rotating body, and the reciprocating rotation operation is performed by meshing gears, so that the reciprocating rotation can be performed slowly and freely without changing the size of the mechanism. An object is to obtain a reciprocating rotation mechanism that can be performed.

[0006]

The present invention will be described with reference to the reference numerals used in the specific examples described later. A drive unit 1 having an output shaft 1a, and an output shaft 1a attached to the output shaft 1a are provided. A first integrally provided full-circumferential gear 2a formed concentrically over the entire circumference, and arc-shaped gear 2b coaxially formed with the full-circumference gear 2a and formed within a range not exceeding half of the full circumference. A rotating body 2, an all-round gear 3a meshing with the all-round gear 2a of the first rotating body 2, and a circle formed coaxially with the all-round gear 3a and within a range not exceeding half of the entire circumference. A second rotating body 3 integrally provided with an arc gear 3b, and a gear 4a meshing with each of the arc gear 2b of the first rotating body 2 and the arc gear 3b of the second rotating body 3 are provided. And a third rotating body 4 for rotating the output shaft 1a by the driving unit 1. The third rotating body 4 selectively meshes with each of the arcuate gear 2b of the first rotating body 2 and the arcuate gear 3b of the second rotating body 3 to perform normal rotation and reverse rotation. It is a reciprocating rotation mechanism configured to alternate.

With this structure, when the drive unit 1 drives to rotate the output shaft 1a, the first rotating body 2 attached to the output shaft 1a rotates. Since the circumferential gear 2a of the first rotary body 2 and the circumferential gear 3a of the second rotary body 3 mesh with each other, the second rotary body 3 also rotates with the rotation of the first rotary body 2. At this time, if the rotating direction of the first rotating body 2 is CW, the rotating direction of the second rotating body 3 is CCW, which is opposite. The gear 4a of the third rotating body 4 selectively meshes with each of the arc-shaped gear 2b of the first rotating body 2 and the arc-shaped gear 3b of the second rotating body 3, so that the drive The rotation of the output shaft 1a by the portion 1 causes the gear 4a of the third rotating body 4 to move to the first rotating body 2
The rotational direction is CCW when meshing with the circular arc gear 2b (rotational direction CW), and the rotational direction when meshing with the circular arc gear 3b (rotational direction CCW) of the second rotating body 3. It becomes CW. In this way, for example, the reciprocating rotation mechanism in which the rotation of the third rotating body 4 drivingly linked to the ornamental body of the timepiece alternates between normal rotation and reverse rotation, and therefore the ornamental body reciprocally rotates.

In this case, even if the rotation of the output shaft of the drive unit is constant, the number of teeth of each gear of the first, second and third rotating bodies is made appropriate.
A speed difference can be brought about in the reciprocating rotation of the third rotating body, and further the decorative body.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail with reference to the drawings.

FIG. 1 is a front view of a reciprocating rotation mechanism according to the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a view of the reciprocating rotation mechanism according to the present invention as seen from the rear side, and FIGS. 4 and 5 show the present invention. It is a perspective view of the reciprocating rotation mechanism concerning.

In these figures, in the reciprocating rotation mechanism of this example, a drive unit 1 such as a motor is installed on a substrate P, and the drive unit 1
The output shaft 1a of the above is projected upward from the substrate P. The first rotating body 2 is attached to the output shaft 1a.

The first rotating body 2 has an all-round gear 2a formed concentrically with the output shaft 1a and all around the output shaft 1a.
The circular arc gear 2b, which is provided coaxially with a and is formed within a range not exceeding half of the entire circumference, is integrally provided.

Reference numeral 3 denotes a second rotating body, which is provided adjacent to the first rotating body 2. The second rotating body 3 includes an all-round gear 3a that meshes with the all-round gear 2a of the first rotating body 2, and
It is integrally provided with an arcuate gear 3b that is provided coaxially with the entire circumference gear 3a and is formed within a range not exceeding half of the entire circumference. In this example, the arc gear 3b of the second rotating body 3 is used.
And the arcuate gear 2b of the first rotating body 2 is provided in the same plane position.

A third rotating body 4 is provided adjacent to the first rotating body 2 and the second rotating body 3. The third rotating body 4 includes a gear 4a that meshes with the arcuate gear 2b of the first rotating body 2 and the arcuate gear 3b of the second rotating body 3, respectively. 4b is a shaft fixed to the gear 4a.

In the present embodiment, the rotation of the output shaft 1a by the drive unit 1 causes the third rotating body 4 to have the arcuate gear 2b of the first rotating body 2 and the arcuate gear 3b of the second rotating body 3.
Are selectively engaged with each other.

Next, the operation of the reciprocating rotating mechanism according to this embodiment will be described.

When the drive shaft 1a is driven by the drive unit 1 to rotate, the first rotating body 2 attached to the output shaft 1a rotates. Since the circumferential gear 2a of the first rotary body 2 and the circumferential gear 3a of the second rotary body 3 mesh with each other, the second rotary body 3 also rotates with the rotation of the first rotary body 2.

At this time, for example, if the rotation direction of the output shaft 1a is CW, the rotation direction of the first rotary body 2 is CW, while the rotation direction of the second rotary body 3 is CC.
W.

The gear 4a of the third rotating body 4 has the first
Since the circular gear 2b of the rotary body 2 and the circular gear 3b of the second rotary body 3 are selectively meshed with each other, the rotation of the output shaft 1a by the drive unit 1 (rotation direction CW) causes The rotating body 4 has a rotating direction CCW when the gear 4a thereof meshes with the arcuate gear 2b (rotating direction CW) of the first rotating body 2, and the arcuate gear 3 of the second rotating body 3 has a rotation direction CCW.
When meshing with b (rotation direction CCW), the rotation direction is CW.

In this way, the rotation of the third rotating body 4 alternates between forward rotation and reverse rotation, and this is taken out as reciprocating rotation of the shaft 4b and applied to reciprocating rotation of, for example, a decorative body. The mechanism is obtained.

If the rotation direction of the output shaft 1a is CCW, the rotation direction of the first rotating body 2 is CCW,
On the other hand, the rotation direction of the second rotating body 3 is the opposite CW.

Then, as described above, the gear 4a of the third rotating body 4 selectively meshes with each of the arcuate gear 2b of the first rotating body 2 and the arcuate gear 3b of the second rotating body 3. Therefore, the rotation of the output shaft 1a by the drive unit 1 (rotational direction CCW) causes the gear 4a of the third rotor 4 to mesh with the arcuate gear 2b of the first rotor 2 (rotational direction CCW). The rotation direction is CW when it is engaged, and the rotation direction is CCW when it is meshed with the arcuate gear 3b of the second rotating body 3 (rotation direction CW).

In this way, as in the case described above,
The rotation of the third rotating body 4 alternates between forward rotation and reverse rotation.

In this example, the gears of the first, second and third rotating bodies are formed in the same number. When formed in this manner, the rotating bodies (first and second rotating bodies in this example) can be made the same, which is convenient because they can be shared. However, without being limited to this, it is also possible to make the number of teeth of each gear appropriate. When formed in this way, a speed difference can be brought to the third rotating body even if the rotation of the output shaft of the drive unit is constant.

[0025]

As described above, according to the present invention, the drive unit 1 having the output shaft 1a and the all-round gear 2a mounted on the output shaft 1a and formed on the entire circumference concentrically with the output shaft 1a. Also, a first rotating body 2 integrally provided with an arcuate gear 2b provided coaxially with the entire circumference gear 2a and formed within a range not exceeding half of the entire circumference, and an entire circumference gear of the first rotating body 2. A second rotating body 3 integrally provided with an all-round gear 3a that meshes with 2a, and an arc-shaped gear 3b that is provided coaxially with the all-round gear 3a and is formed within a range not exceeding half of the entire circumference; Circular gear 2b of first rotating body 2 and circular gear 3b of second rotating body 3
Third rotating body 4 provided with a gear 4a that meshes with each of the
And the rotation of the output shaft 1a by the drive unit 1 causes the third rotating body 4 to be alternative to each of the arcuate gear 2b of the first rotating body 2 and the arcuate gear 3b of the second rotating body 3. It is a reciprocating rotary mechanism configured to mesh with each other to alternately perform normal rotation and reverse rotation. Therefore, it is possible to obtain a reciprocating rotary mechanism capable of slowly reciprocating rotation without changing the size of the mechanism. It is a thing.

[Brief description of drawings]

FIG. 1 is a front view of a reciprocating rotation mechanism according to the present invention.

FIG. 2 is a plan view of a reciprocating rotation mechanism according to the present invention.

FIG. 3 is a view of the reciprocating rotation mechanism according to the present invention as viewed from the back side.

FIG. 4 is a perspective view of a reciprocating rotation mechanism according to the present invention.

FIG. 5 is a perspective view of a reciprocating rotation mechanism according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 drive part 1a output shaft 2 1st rotary body 2a all-round gear 2b circular-arc gear 3 second rotary body 3a all-round gear 3b circular-arc gear 4 3rd rotary body 4a gear 4b axis P substrate

Claims (1)

[Claims] 1. A drive unit having an output shaft, an all-round gear attached to the output shaft and formed on the entire circumference concentrically with the output shaft, and an all-round gear provided coaxially with the all-round gear. A first rotating body integrally provided with an arcuate gear formed in a range not exceeding half of the above, an all-round gear meshing with the all-round gear of the first rotating body, and a coaxial with the all-round gear. A second rotating body integrally provided with an arcuate gear that is provided and does not exceed half of the entire circumference; the arcuate gear of the first rotating body and the arcuate shape of the second rotating body Third with gears that mesh with each of the gears
A rotating body, wherein the third rotating body is selected from the arcuate gear of the first rotating body and the arcuate gear of the second rotating body by rotation of the output shaft by the driving unit. A reciprocating rotation mechanism characterized by engaging in one and alternately performing forward rotation and reverse rotation.