JPH0861458A - Reverse rotation preventing mechanism - Google Patents

Abstract

PURPOSE: To improve the effect to prevent the reverse rotation of a rotary shaft by rotating a rotary member over the free end of an elastic arm of a body of revolution relative to a rugged part of the rotary member when a rotary shaft is rotated by a winding source such as a power spring winding mechanism of a music box. CONSTITUTION: A rotary member 10 is rotated through a drum gear or the like of a music box which is engaged with a tooth part 10a, and when a power spring is wound and a winding shaft 12 is turned in the direction of the arrow (a), a body 14 of revolution is turned together with the winding of the power spring. The body 14 of revolution is rotated by the riding-over motion of a free end 14b of an elastic arm 14c of the body 14 of revolution relative to a rugged part 10b of the rotary member 10. When the winding action of the power spring is stopped, the body 14 of revolution is tried to be tuned in the direction (b) by the winding-back force of the power spring, but the free end 14b of the elastic arm 14c is engaged like a wedge between the rugged part 10b of the inner surface of the rotary member 10 and an abutted part 14a of the rotary member 14 to prevent the reverse rotation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention particularly relates to a reverse rotation preventing mechanism used in, for example, a music box full-winding mechanism.

[0002]

2. Description of the Related Art In a conventional music box, the "ratchet mechanism" provided between the whole dance and the drum is small and
It is required that the number of parts be reduced, the processing cost be reduced, the assembling work be easy, the torque resistance be large, and the hoisting of the whole dance be light.

However, some "ratchet mechanisms" using synthetic resin parts have already been proposed in order to meet such requirements.

For example, as shown in FIG. 5, the "ratchet mechanism" disclosed in Japanese Patent Application Laid-Open No. 58-91932 is provided with a rotary member 30 made of synthetic resin and coaxially with the rotary member 30. In a "ratchet mechanism" having a rotating body 32, a part of which is fitted into the rotating member 30, either one of the rotating member 30 or the rotating body 32 has a plurality of elasticity including an engaging portion 34a. Synthetic resin transmission pieces 34 are arranged at equal intervals, and a plurality of protrusions 36 to be engaged with the engaging portions 34a of the transmission piece 34 are arranged at equal intervals on either the rotating body 32 or the rotating member 30. Then
There is one in which the number of each of the transmission piece 34 and the projection 36 is set such that one is a non-integer multiple of the other and has a common divisor.

[0005]

By the way, in such a conventional technique, since the rotating member is made of synthetic resin, the number of parts is smaller than that of the conventional mechanism, and the assembly by press-fitting is not necessary, so that the automatic assembly is performed. It was easy and at the same time there was less variation in performance.

However, since the number of each of the transmission pieces 34 and the projections 36 is a non-integer multiple of the other, the transmission pieces and the projections engaged to prevent the rewinding of the whole dance. On the other hand, the transmission piece and the protrusion that are not engaged are present.

The transmission piece which is not engaged with the projection for the purpose of preventing it from being reversed is in a state of being pushed by the projection. Since this transmission piece is made of synthetic resin, if the transmission piece that does not directly contribute to the non-return action is pushed by the projection for a long period of time, a permanent deformation called creep phenomenon peculiar to synthetic resin occurs. Occurs. The permanently deformed transmission piece has the drawback that the engagement with the projection becomes unstable or does not engage at all, and the original function of the "ratchet mechanism" is not fulfilled.

The present invention has been made in view of the above-mentioned problems of the prior art, and when the rotary shaft of the rotary drive source tries to rotate in the reverse direction, the rotary member and the contact portion of the rotary body are contacted with each other. The object of the present invention is to reliably prevent the reverse rotation of the rotating shaft by the great frictional action of the above and to provide a stable reverse rotation preventing mechanism.

[0009]

In order to achieve the above-mentioned object, the reverse rotation preventing mechanism of the present invention is provided with at least one abutting portion and contacts the inside of the rotating member at the time of forward rotation and at the time of backward rotation. A rotary body having an elastic arm having a free end for wedge-shaped insertion and engagement between the inside of the rotating member and the abutting portion is provided in the vicinity of the abutting portion. , And is fixed to the rotary shaft of the rotary drive source installed on the machine base, and when the rotary shaft is about to rotate in the reverse direction,
The free end of the elastic arm is configured to be inserted and engaged in a wedge shape between the inner surface of the rotating member and the abutting portion.

The preferred embodiment of the present invention is at least one.
An elastic arm having two abutting portions and having a free end that is in contact with the outer side of the rotating member during forward rotation and is wedge-shaped inserted and engaged between the outer side of the rotating member and the abutting portion during reverse rotating. A rotating body provided close to the contact portion,
It is arranged outside the rotary member and is fixed to the rotary shaft of a rotary drive source installed on the machine base, and when the rotary shaft tries to rotate in the reverse direction, the free end of the elastic arm is attached to the outer surface of the rotary member. It is configured so as to be inserted and engaged in a wedge shape between and the contact portion.

Another preferred embodiment of the present invention is to provide a pair of contact portions and an elastic arm.

According to another preferred embodiment of the present invention, an uneven portion is formed on the inner surface of the rotating member.

According to another preferred embodiment of the present invention, an uneven portion is formed on the outer surface of the rotating member.

Further, as a preferred embodiment of the present invention,
The free end of the elastic arm is disposed on the rotation locus of the rotating body.

[0015]

In the reverse rotation preventing mechanism of the present invention, when the rotary shaft of the rotary drive source is operated, the rotary body is rotated in the forward direction when the rotary shaft is rotated. At this time, the free end of the elastic arm of the rotating body moves over and rotates with respect to the uneven portion of the rotating member.

When the operation of the rotary shaft is stopped, the abutment portion of the rotary body is rotated by the reverse rotational force of the rotary drive source, and the free end of the elastic arm abuts the concave-convex portion of the rotary member and the rotary body. It is inserted and engaged in a wedge shape between the parts.

Therefore, the reverse rotation of the rotary shaft can be reliably prevented.

[0018]

Embodiments of the reverse rotation preventing mechanism according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a plan view showing an embodiment of a reverse rotation preventing mechanism according to the present invention, and FIG. 2 is a schematic sectional view thereof.

Reference numeral 10 is a rotary member made of synthetic resin, and the outer peripheral edge of the rotary member 10 has a tooth portion 10a which meshes with a gear (not shown) which is substantially integrally formed with a drum of a music box. Has been done.

On the inner circumference of the rotating member 10, a plurality of substantially triangular corrugated portions 10b are formed along the entire circumference. By this uneven portion 10b, when the whole dance installed on the machine base (not shown) is wound up, it is possible to obtain an actual feeling of winding up with an intermittent winding sound.

The concave-convex portion 10b is formed in the rotating body 1 described later.
It goes without saying that a trapezoid other than the triangular waveform may be used as long as the free end 14b of 4 can move in the direction of the arrow a and move, and cannot move in the direction of the arrow b.

Reference numeral 12 denotes a full-scale winding shaft, which is rotatably fitted and supported in the central portion of the rotating member 10. This reel 1
2, one end of the whole dance not shown is locked,
The entire dance is wound up by rotating the winding shaft 12 in the direction of the arrow a.

Reference numeral 14 is a rotating body made of an elastic material such as synthetic resin, which is press-fitted and fixed to the winding shaft 12. A pair of abutting portions 14a and a pair of elastic arms 14c having free ends 14b are formed in the rotating body 14 at symmetrical positions.

The free end 14b of the elastic arm 14c is
When the unwinding of the whole dance is prevented, a wedge-shaped insertion member is provided between the inner surface uneven portion 10b of the rotating member 10 and the contact portion 14a of the rotating body 14 so as to impart a great frictional action as indicated by a chain line. Are combined.

In this embodiment, since the pair of abutting portions 14a and the elastic arms 14c are provided in the rotating body 14 at symmetrical positions with respect to each other, the transmission position of the torque of the whole dance is at a symmetrical position, and the rotating body is rotated. No eccentricity occurs between the member 10 and the rotating body 14.

The free end 14b of the elastic arm 14c
Are arranged on the rotation locus, the rotating member 1
No. 0 inner surface uneven portion 10b and the contact portion 14 of the rotating body 14
It is wedge-shaped inserted and engaged with a and reliably prevents the rewinding of the whole dance.

Next, the operation of the reverse rotation preventing mechanism according to the present invention during the hoisting operation of the whole dance will be described.

The rotating member 10 is adapted to rotate via a drum gear of, for example, a music box, which meshes with the tooth portion 10a.

When the winding shaft 12 is rotated in the direction of the arrow a during the winding operation of the whole dance, the rotating body 14 is rotated together with the winding of the whole dance. At this time, the free end 14b of the elastic arm 14c of the rotating body 14 can move over the concave-convex portion 10b of the rotating member 10 in the direction of arrow a and move.

When the hoisting motion of the whole dance is stopped, the contact portion 14a of the rotating body 14 is rotated in the direction of the arrow b by the rewinding force of the full dance, and the free end 14 of the elastic arm 14c is rotated.
b is inserted and engaged in a wedge shape between the inner surface uneven portion 10b of the rotating member 10 and the contact portion 14a of the rotating body 14.

Therefore, the rewinding of the whole dance is surely prevented,
It is possible to reliably prevent reverse rotation during the winding operation of the whole dance.

FIG. 3 is a plan view showing another embodiment of the reverse rotation preventing mechanism according to the present invention, and FIG. 4 is a perspective view thereof.

Reference numeral 20 is a rotary member made of synthetic resin, and the outer peripheral edge of the rotary member 20 is provided with a tooth portion 20a which meshes with a gear (not shown) substantially integrally formed with a music box drum. In addition, a plurality of (4) substantially triangular corrugated concave and convex portions 20b are formed on the outer periphery of the lower portion of the rotating member 20 at equal intervals. By this uneven portion 20b, when the whole dance installed on a machine stand (not shown) is wound up, it is possible to obtain an actual feeling of being wound by making an intermittent winding sound.

The concave-convex portion 20b is formed in the rotating body 2 described later.
Needless to say, a trapezoid other than the triangular waveform may be used as long as the free end 22b of 2 can move over in the direction of the arrow a and move in the direction of the arrow b as long as it cannot move.

The unwound winding shaft 12 (not shown) is rotatably fitted and supported on the central portion of the rotating member 20. One end of the whole dance is locked on this winding shaft 12,
The entire dance is wound up by rotating the winding shaft 12 in the direction of the arrow a.

Reference numeral 22 is a rotary member made of an elastic material such as synthetic resin, which is press-fitted and fixed to the winding shaft 12. The rotating body 22 includes a pair of inclined contact portions 22a and a free end 2a.
A pair of elastic arms 22c having 2b are formed at positions symmetrical to each other.

The free end 22b of the elastic arm 22c is
When the rewinding of the whole body is prevented, it is inserted and engaged in a wedge shape between the outer surface of the rotating member 20 and the inclined contact portion 22a of the rotating body 22 so as to give a great frictional action as shown by the chain line. It

In this embodiment, the rotating body 22 is
Since the pair of inclined contact portions 22a and the elastic arm 22c are provided in symmetrical positions with respect to each other, the torque transmission points of the whole dance are in symmetrical positions, and between the rotating member 20 and the rotating body 22. No eccentricity occurs.

Further, since the free end 22b of the elastic member 22c is disposed on the rotation locus, it is inserted like a wedge between the outer surface of the rotating member 20 and the inclined contact portion 22a of the rotating body 22. As a result, the rewind of the whole dance is surely prevented.

The present embodiment and the above embodiment are different from each other only in the shapes and arrangements of the rotary member and the rotary body, and the operational effects are almost the same as those in the above embodiment, and therefore detailed description thereof will be omitted.

Although the embodiment of the present invention discloses prevention of reverse rotation at the time of hoisting movement of all dances in a music box, for example, other techniques are possible without departing from the scope of the claims. Of course, it can be applied to.

[0043]

As described in detail above, the reverse rotation preventing mechanism of the present invention is provided with at least one contact portion and contacts the inside of the rotating member during forward rotation and inside the rotating member during reverse rotation. A rotary body provided with an elastic arm having a free end for inserting and engaging in a wedge shape between the contact part and the contact part is disposed inside the rotating member, and the machine base Fixed to the rotary shaft of the rotary drive source installed in the above, and when the rotary shaft is about to rotate in the reverse direction, the free end of the elastic arm is inserted like a wedge between the inner surface of the rotary member and the contact portion. It is configured to engage with each other, and is provided with at least one abutting portion, and is in contact with the outside of the rotating member during forward rotation, and between the outside of the rotating member and the abutting portion during reverse rotation. Elastic arm with a free end for wedge-shaped insertion The rotating body provided in the vicinity of the abutting portion is disposed outside the rotating member, and is fixed to the rotating shaft of the rotary drive source installed on the machine base. At this time, the free end of the elastic arm is configured to be inserted and engaged in a wedge shape between the outer surface of the rotating member and the abutting portion. There is an effect that the reverse rotation of the rotary shaft of the rotary drive source can be surely prevented by the large frictional action. Further, even if the rotating member and the rotating body are made of synthetic resin, there is no problem.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a reverse rotation prevention mechanism according to the present invention.

FIG. 2 is a schematic sectional view of the same.

FIG. 3 is a plan view showing another embodiment of the reverse rotation prevention mechanism according to the present invention.

FIG. 4 is a perspective view of the same.

FIG. 5 is a plan view showing a mechanism of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 rotating member 10a tooth part 10b uneven part 12 winding shaft 14 rotating body 14a contact part 14b free end 14c elastic arm 20 rotating member 20a tooth part 20b uneven part 22 rotating body 22a inclined contact part 22b free end 22c elastic arm

Claims (6)

[Claims] 1. Providing at least one abutting portion,
An elastic arm having a free end that is in contact with the inside of the rotating member during forward rotation and that is inserted and engaged in a wedge shape between the inside of the rotating member and the contact portion during reverse rotation is provided close to the contact portion. The rotating body provided as above is disposed inside the rotating member and is fixed to the rotary shaft of the rotary drive source installed on the machine base,
When the rotating shaft tries to rotate in the reverse direction, the free end of the elastic arm is inserted and engaged in a wedge shape between the inner surface of the rotating member and the abutting portion to prevent reverse rotation. mechanism. 2. Providing at least one abutting portion,
An elastic arm having a free end that comes into contact with the outside of the rotating member during forward rotation and has a wedge-shaped insertion engagement between the outside of the rotating member and the contact portion during reverse rotation is provided close to the contact portion. The rotating body is provided outside the rotating member and is fixed to the rotary shaft of the rotary drive source installed on the machine base.
When the rotating shaft tries to rotate in the reverse direction, the free end of the elastic arm is inserted and engaged in a wedge shape between the outer surface of the rotating member and the abutting portion, thereby preventing the reverse rotation. mechanism. 3. The reverse rotation preventing mechanism according to claim 1 or 2, wherein a pair of contact portions and an elastic arm are provided. 4. The reverse rotation preventing mechanism according to claim 1, wherein a concavo-convex portion is formed on the inner surface of the rotating member. 5. The reverse rotation preventing mechanism according to claim 2, wherein an uneven portion is formed on the outer surface of the rotating member. 6. The reverse rotation preventing mechanism according to claim 1, wherein a free end of the elastic arm is arranged on a rotation locus of the rotating body.