JPH0322589Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) This invention relates to a unidirectional rotational output mechanism that keeps the rotational direction of the output shaft constant regardless of the rotational direction of the rotational input shaft which is rotated in forward and reverse directions.

(Prior Art) One known one-way rotation output mechanism uses a gear train to rotationally drive the drum of a music box. A worm is always meshed with a drum gear that is integrated with the drum, an intermediate gear is always meshed with a gear that is integrated with the worm, and a planetary gear is meshed with a sun gear that is integrated with a rotating input shaft. The planetary gear is provided to be capable of planetary movement according to the rotational direction of the sun gear, and is adapted to selectively mesh with the intermediate gear or the gear integrated with the worm. When the sun gear is rotated in the first direction by the rotary input shaft, the planetary gear moves along with the rotation and meshes with, for example, a gear integrated with the worm, rotating the worm and moving the drum gear in a predetermined direction. Drive to rotate. Next, when the sun gear is rotated in a second direction opposite to the first direction by the rotary input shaft, the planetary gear moves accordingly and meshes with the intermediate gear. The worm is rotated via an intermediate gear to rotationally drive the drum gear in a predetermined direction.

In addition, two gear trains consisting of an odd number of gears and an even number of gears each meshing with the sun gear are held on a gear holding plate frictionally coupled to the rotation input shaft, and the rotation direction of the rotation input shaft is adjusted according to the rotation direction of the rotation input shaft. By rotating the gear holding plate and meshing the odd number of gear trains with the gear that is integrated with the worm, or meshing the even number of gear trains with the gear that is integrated with the worm,
The drum gear is rotationally driven in a predetermined direction.

(Problem to be solved by the invention) The above two examples have a feature that the output shaft is rotationally driven in a predetermined direction even if the rotation input shaft is rotated in either the forward or reverse direction. . However, in the former, the number of gears composing the gear train is changed by moving the planetary gear, and in the latter, the number of gears composing the gear train is changed by moving the entire gear train. The rotation direction of the output shaft is kept constant by changing the number of . That is, conventionally,
Because it requires a gear train and a shaft to support them,
There is a problem that the number of parts increases, the configuration becomes complicated, and the cost increases.

An object of the present invention is to provide a unidirectional rotational output mechanism that has a small number of parts, that is, has a simple configuration and is inexpensive.

(Structure) A sun gear integrally provided with a rotary input shaft that is rotatable in forward and reverse directions, a planetary gear that constantly meshes with the sun gear, a worm integrally formed with the planetary gear, and the planetary gear and the planetary gear. The device includes a gear support member that rotatably supports a worm and is rotatably provided around the rotation input shaft, and an output gear that meshes with the worm.

(Function) When the rotation input shaft rotates in the normal direction, the sun gear rotates in the normal direction.
At the same time, the planetary gear revolves, and a worm integrated with the planetary gear meshes with one side of the output gear, driving the output gear to rotate in a fixed direction. When the rotational input shaft is reversed, the sun gear reverses, and the planetary gear revolves accordingly.The worm that is integrated with this gear meshes with the other side of the output gear, and the output gear is driven to rotate in a fixed direction. do.

(Example) Hereinafter, the present invention will be explained in detail based on the illustrated example.

1 to 3, a drum 2 is rotatably supported on a frame 1 of a music box. A diaphragm 3 is attached to the frame 1 by a fixing screw.
The base end of the diaphragm 3 is fixed, and the tip of the diaphragm 3 is
It is placed close to the circumferential surface of the drum. frame 1
A substrate 4 is fixed to the base plate 4 by a caulking portion 5. A bearing portion 4b having a bearing hole 4a that rotatably supports a shaft 6a formed on one end plate 6 of the drum 2 is formed on one side edge of the substrate 4.

A shaft hole 4d is formed in the bent horizontal portion 4c at the upper end of the bearing portion 4b, and a slightly smaller shaft hole 4e corresponding to the hole 4d is formed in the main body portion of the substrate.
A horizontal portion 9 of the gear support plate 9 is provided on the upper surface of the horizontal portion 4c.
A is placed. At both ends of the gear support plate 9,
Drooping arms 9c and 9d are formed, and bearing portions 9e and 9f are formed at their respective ends so as to face each other. Each bearing part has
Shaft holes 9g and 9h are formed, respectively. In the horizontal portion 9a of the gear support plate 9, shaft holes 9i and 9j are formed, respectively, to form a pair with the shaft holes 9g and 9h. Large-diameter insertion holes 9k and 9l for inserting worms, which will be described later, are formed in series in the shaft holes 9i and 9j. The first worm 12 inserted through the insertion hole 9k has its lower end shaft portion 12a fitted into the shaft hole 9g, and then the upper shaft portion 12b is moved to the shaft hole 9i. Horizontal part 9a
The upper end of the first worm 12 protruding from the worm 12 is knurled, and the first planetary gear 13 is press-fitted into this. On the other hand, insertion hole 9l
The second worm 14 inserted from above has its lower end shaft portion 14a fitted into the shaft hole 9h, and then its upper shaft portion 14b is moved to the shaft hole 9j. Horizontal part 9
The upper end of the second worm 14 protruding from a is
It has a knurling process of 14c, which has a second
A planetary gear 15 is press-fitted and fixed. In addition, the first
The worm and the second worm are attached to the gear support plate 9 after the planetary gears are press-fitted and fixed thereto.

Rotation center hole 9b of gear support plate 9 and substrate horizontal portion 4
The rotational input shaft 7 is rotatably inserted into the shaft hole 4d of c, and the small diameter portion at the tip thereof is fitted into the shaft hole 4e. A sun gear 10 having a flange 10a is press-fitted into the knurled portion 7a of the rotary input shaft 7. At this time, the sun gear 10
meshes with the first planetary gear 13 and the second planetary gear 15, and positions each planetary gear at its respective rotation center (shaft holes 9i, 9j). Between the sun gear 10 and the horizontal portion 9a of the gear support plate 9, there is a friction plate 11 made of, for example, a steel plate whose part is bulged in a corrugated shape.
are arranged, a sun gear 10 and a gear support plate 9
are frictionally connected. The friction plate 11 may be of other types. The rotation input shaft 7 is connected to the horizontal portion 4
E-ring 8 fitted to the part corresponding to the lower surface of c
(See FIG. 2) to prevent it from coming off from the board 4. As a result, the gear support plate 9
c and the lower end surface of the sun gear 10, the sun gear 10 is rotatably supported with axial movement restricted. When the rotation input shaft 7 is prevented from coming off, the second
As shown in the figure, the flange 10a of the sun gear 10
has its lower end face opposed to the upper end face of each planetary gear 13, 15, and restricts movement of the planetary gear in the axial direction when driving the output gear, which will be described later. The upper part of the rotation input shaft 7 is a handle 7b bent into a crank shape.

On the other hand, in the drum 2, as shown in FIG. 1, the tip of a shaft 16 inserted through the convex portion 1a of the frame 1 is fitted into an end plate 17. Therefore, the drum 2 is supported by the frame so as to be rotatable about the rotating shaft composed of the shaft 6a and the shaft 17. Each worm 12, 1 is mounted on one end plate 6 of the drum 2.
Tooth portion 6b as an output gear with which No. 4 selectively meshes.
is integrally molded. Although a spur gear is used as the tooth portion 6b in the illustrated example, it may also be a bevel gear or a crown gear. A first worm 12 is placed on one side 6c of the toothed portion 6b facing the rotation axis of the drum 2 (see axis 6a in FIG. 6), and a second worm 12 is placed on the other side 6d.
The worms 14 are selectively engaged with each other.

The operation of the embodiment configured as above will be explained. FIG. 1 shows a state in which both the first worm 12 and the second worm 14 are spaced apart from the tooth portion 6b. In this state, when the handle 7b is rotated clockwise (forward rotation), the rotation input shaft 7 causes the sun gear 10 to rotate forward. The rotation of the sun gear 10 causes the gear support plate 9 to rotate in the normal direction via the friction plate 11, as shown in FIG. As the gear support plate rotates, the planetary gears 13 and 15 meshing with the sun gear 10 are caused to revolve. The rotation of the gear support plate 9 is regulated by the first worm 12 meshing with one side 6c (see FIG. 6) of the tooth portion 6b serving as the output gear. As a result, the planetary movement of the gear support plate, that is, the first planetary gear 13 is stopped, so that the planetary gear 12 is rotated in the direction of arrow a as the sun gear rotates. The rotation of the planetary gear is transmitted to the toothed portion 6b via the first worm 12, and drives the end plate 6, that is, the drum 2, which is integral with the toothed portion, to rotate in a fixed direction shown by arrow b. When the drum 2 rotates, a pin protruding from the outer circumferential surface of the drum 2 hits a specific vibration valve on the diaphragm 3 to play music. At this time, a second
The worm 14 is idled at a position spaced apart from the tooth portion 6b. The first worm 12 has teeth 6b
When rotating, the worm presses down one side 6c and rotates the toothed portion 6a, so that the worm tries to move in the axial direction due to the reaction force, but this movement is caused by the upper part of the first planetary gear 13. End face is flange 10
It is regulated by sliding contact with a.

Next, as shown in FIG. 5, when the handle 7b is rotated counterclockwise (reverse rotation), the sun gear 1
0 reversely rotates the gear support plate 9 via the friction plate 11. When the gear support plate rotates, each planetary gear 13, 15 meshing with the sun gear 10 is caused to revolve. The rotation of the gear support plate 9 is caused by the second worm 14
is regulated by meshing with the other side 6d of the tooth portion 6b (see FIG. 6). gear support plate i.e. second
When the planetary movement of the planetary gear 15 is stopped, the planetary gear 15 is rotated in the direction of arrow c as the sun gear rotates. The rotation of this planetary gear is
It is transmitted to the tooth portion 6b via the worm 14, and drives the drum 2 to rotate in a fixed direction shown by arrow b.
The drum 2 rotates and plays the vibration valve of the diaphragm 3 to play music in the same way as when the rotary input shaft 7 is rotated in the forward direction. That is, regardless of whether the rotational input shaft 7 is rotated in the forward or reverse direction, the output gear 6b
is always rotated in a constant direction b. In the embodiment described above, worms are disposed at both ends of the gear support plate 9, and the worms that mesh with the output gear during forward and reverse rotation of the rotary input shaft are used, so that even a small rotation angle of the rotary input shaft 7 The worm and the output gear 6b can be meshed with each other.

Next, referring to FIG. 7, another embodiment of the present invention will be described. In this embodiment, a pair of planetary gears 130 and a worm 120 having the same configuration as the first planetary gear 13 and first worm 12 described above are rotatably supported on a gear support plate 90. Gear support plate 9
0, a rotation center hole 9b through which the rotation input shaft 7 is inserted, shaft holes 9e and 9i for supporting the worm 120, and a worm insertion hole 9k are formed, respectively, as shown in FIG. When the rotation input shaft 7 is rotated in the clockwise direction, the sun gear 10 rotates and meshes with the sun gear 10. The planetary gear 130 and the gear support plate 90 are rotated in the same direction. warm 120
When the worm meshes with one side 6c of the toothed portion 6b (see first worm 12 in FIG. 6), the rotation of the support plate 90 is restricted, and the toothed portion 6b serving as an output gear is rotationally driven to rotate the drum 2 at a predetermined position. Rotate in direction b. When the rotational input shaft 7 is reversed counterclockwise, the gear support plate 90 is rotated counterclockwise from the position shown in FIG. 7 due to the friction of the sun gear 10, and the worm 12
0 meshes with the other end 6d of the tooth portion (see second worm 14 in FIG. 6) and is stopped. The worm 120, which is integrated with the planetary gear 130 rotated by the sun gear 10, rotates the toothed portion 6b, thereby rotating the drum 2 in the direction of arrow b, which is a fixed rotational direction. In this embodiment, a single worm 120 is connected to the output gear (teeth 6
Since the gears are selectively engaged with the opposite sides of b), there is a problem that the start-up of rotation of the output gear is slightly delayed when the rotation direction of the rotary output shaft is changed. However, it has the great advantage of being simple in structure and requiring only a small number of parts, making it suitable for use in equipment where the timing of start-up does not have to be a problem.

In the embodiments described above, the drum of a music box is driven in a fixed direction by a rotating input shaft that rotates in forward and reverse directions, but the present invention is not limited to directly rotating the driven body. For example, if the Zenmai winding shaft of the Zenmai winding mechanism of a Zenmai-driven device (music box or toy) is connected to the output gear as defined in the present invention, the Zenmai winding mechanism of a Zenmai drive device (music box or toy) can be connected to the output gear in the present invention. You can make a dance. In addition, there is a known car toy in which the wheels are pressed against the floor and the car is pulled in the opposite direction to the direction of travel, causing the wheels to rotate and winding up. This toy car winds up the Zenmai by rotating the drive wheel in a fixed direction, but the toy's Zenmai winding shaft is connected to the output gear as defined in the present invention, and the rotation input is If the wheels are fixed to the shaft, it becomes possible to hoist the car in full motion whether it is pushed or pulled, and the whole hoisting operation can be performed easily.

(Effects of the invention) As described above, according to the invention, although it has a simple structure with a reduced number of parts, the output gear can be rotated in a fixed direction by forward and reverse rotation of the rotary input shaft. A low-cost unidirectional rotation output mechanism can be provided.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the present invention; Fig. 2 is a plan view of a unidirectional rotation output mechanism applied as a drive source for a music box; Fig. 2 is a front view of the same; Fig. 3 is an exploded perspective view of the same; Figure 4 is a plan view showing the state when the rotation input shaft is rotated in the forward direction, Figure 5 is a plan view showing the state when the rotation input shaft is rotated in the reverse direction, and Figure 6 is a plan view showing the state when the rotation input shaft is rotated in the reverse direction.
The figure is a front view showing the engagement between the worm and the output gear, FIG. 7 is a plan view of a main part showing another embodiment of the present invention, and FIG. 8 is a perspective view showing the gear support plate of the same. 6b...Output gear, 7...Rotation input shaft, 9,9
0...Gear support plate, 10...Sun gear, 12,1
4,120...Worm, 13,15,130...
...Planetary gear.

Claims (1)

[Scope of Claim for Utility Model Registration] A rotational input shaft provided to be able to freely rotate in forward and reverse directions, a sun gear provided substantially integrally with this rotational input shaft, a planetary gear that constantly meshes with this sun gear, and this planetary gear. A worm formed substantially integrally with the gear, a gear support member rotatably supporting the planetary gear and the worm, and rotatably provided around the rotation input shaft, and the worm mesh with each other. an output gear, the planetary gear revolves around the sun gear in the rotational direction of the rotational input shaft, and the worm is selectively moved to a side opposite to the rotational axis of the output gear. A unidirectional rotation output mechanism characterized in that the output gear is rotated in a constant direction by meshing with each other, regardless of the rotation direction of the rotation input shaft.