JPH0727188A - Drive force transmission device - Google Patents

Abstract

PURPOSE:To provide a driven force transmission device which is constituted to drive through reliable selection of a plurality of driven gears, be disposed at a limited space, reduce the number of constituting parts, and further reduce a cost. CONSTITUTION:A planetary gear driven mechanism part comprises a solar gear 2; a planetary gear 3, and a planetary arm 4. Through press of a planetary pin 5 held by the planetary arm 4, a lock lever 10 is moved to a position between first and second rotation positions. When it is moved to the second rotation position, rotation of the planetary arm 4 is blocked through the planetary pin 5. Some of a plurality of driven gears 6, 7, and 8 is geared with the planetary gear 3 to bring the driven gears 6, 7, 8 into a state to be capable of being driven.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving force transmission device, and more particularly to a driving force transmission device for selecting and driving a load mechanism via a plurality of driven gears.

[0002]

2. Description of the Related Art Conventionally, various types of driving force transmission devices have been proposed for switching and driving a load mechanism section via a plurality of driven gears. A gear driving device, which is a driving force transmission device disclosed in Japanese Patent Application Laid-Open No. 2-291039, is a mechanism that can select and drive three driven gears that are driven gears. Driving the drive gear,
When an overload is detected, the locking lever is reversed to switch the drive to a predetermined driven gear. The rotation directions of the three driven gears are set in advance.

[0003]

However, since the gear drive device disclosed in Japanese Patent Laid-Open No. 2-2991539 is configured to switch the drive to the driven gear by detecting the overload torque. It was difficult to set the torque value at the time of normal driving and at the time of switching.

The present invention has been made in order to solve the above-mentioned inconvenience, and a plurality of load gears can be surely selected and driven, and can be arranged in a small space, and the number of constituent parts can be increased. It is also an object of the present invention to provide a driving force transmission device which can be reduced in cost and is low in cost.

[0005]

A driving force transmission device of the present invention is a planetary gear mechanism including a planetary arm that rotates or revolves a planetary gear in association with the rotation of a sun gear, and an orbit of the planetary gear. And a plurality of driven gears that drive the load mechanism by meshing with the planetary gears, a projection means provided on the planetary arm on the planetary gear side and movable with respect to the planetary arm, and the planetary gears. When the protrusion means rotates in accordance with the revolution of the gear, the protrusion means moves between a first rotation position and a second rotation position, and when the protrusion means moves to the first or second rotation position. While the rotation of the projection means is blocked and the rotation blocking part for meshing the driven gear and the planet gear with the projection means and the rotation of the projection means are allowed, the first or second rotation position is set. A locking lever having a switching cam portion to be moved, and the locking lever. Over the or the first, above, characterized by comprising holding means for holding the second rotational position.

[0006]

[Function] By the rotation of the projection means, the locking lever is moved to the first position.
Between the rotation position and the second rotation position, and when the protrusion means is moved to the first or second rotation position, the protrusion means is prevented from rotating and the plurality of driven units are driven. One of the gears is meshed with the planetary gear to bring the driven gear into a drivable state.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a main portion of a driving force transmission device showing an embodiment of the present invention, and FIGS.
Reference numerals 0 and 12 show plan views in each operating state of the above apparatus.
Further, FIGS. 3, 5, 7, 9, 11, and 13 are the same as those in FIG.
Each A-on the revolution orbit of each planetary gear 4,8,10,12
It is a development view of the A'section. It should be noted that the present apparatus is applied as a driving apparatus for driving the photographing lens of the camera forward and backward, driving the exposure control mechanism, driving the film feeding, and the like.

The structure of the driving force transmission device of this embodiment will be described below. As shown in FIG. 1 and the like, the main body 1 includes
The sun gear 2 is rotatably supported, and the sun gear 2
Is driven via a reduction gear train by a motor (not shown).

The planet arm 4 is rotatably supported by the main body 1 coaxially with the sun gear 2. Planetary arm 4
A planetary gear 3 is rotatably supported by a planetary arm 4 while being provided with a rotational friction on the tip end side of the. Then, coaxially with the planetary gear 3, the planetary pin 5 as a protrusion means is provided.
Is supported by the planetary arm 4 slidably in the vertical direction in FIG. 3, and is urged upward by the coil spring 11. Further, driven gears 6, 7, and 8 are rotatably and axially supported by the main body 1 on the revolution orbit of the planetary gear 3. Then, a load mechanism (not shown), which will be described later, in which a predetermined mechanism functions by being rotated in one direction, is connected to each of the driven gears 6, 7, and 8.

When the planetary arm 4 rotates clockwise, the boss 1c that abuts the planetary arm 4 at a position where the planetary gear 3 and the driven gear 8 mesh with each other and prevents the planetary arm 4 from rotating clockwise. 1 has been planted integrally (see FIG. 12). An internal gear 9 that meshes with the planetary gear 3 is integrally supported by the main body 1 on the revolution path of the planetary gear 3 between the driven gear 6 and the driven gear 7.

The locking lever 10 is rotatably supported by the main body 1 and is in a first rotation position shown in FIGS. 6 and 8 or a second rotation position shown in FIGS. It rotates between the positions and contacts with the stoppers 1a and 1b that are integrally planted on the main body 1 to be positioned.

The locking lever 10 is attached to the first and second parts.
Toggle spring 12, which is a holding means for holding the two rotating positions.
Is the pin 10g that is planted on the locking lever 10 and the main body 1
The lock lever 10 is suspended between the pin 1d and the stopper lever 1 depending on the rotation position of the lock lever 10.
It is urged in the direction of coming into contact with a or 1b. That is, in the state of FIGS. 6 and 8, the locking lever 10 is biased clockwise, and in the states of FIGS. 2, 4, 10 and 12, it is biased counterclockwise.

On the right side of the locking lever 10, a first locking portion 10f, which is a rotation blocking portion, is formed. When the first locking portion 10f is in the first rotation position,
The planet pins 5 come into contact with each other to prevent the planetary arm 4 from rotating clockwise at a position where the planetary gear 3 meshes with the driven gear 7.
A first contact portion 10e, which is a switching cam portion, is formed on the same right side of the locking lever 10. When the planetary arm 4 rotates counterclockwise from the position shown in FIG. 8 and the planetary gear 3 and the internal gear 9 are in mesh with each other, the planetary pin 5 comes into contact with the first contact portion 10e. Then, the locking lever 10 is biased counterclockwise and rotated. Furthermore,
When the planetary arm 4 rotates clockwise from the state of the locking lever 10 shown in FIG. 6, the planetary pin 5 is moved downward as shown in FIG. 7, and the locking lever 10 itself is not rotationally displaced. A first passage portion 10d that allows only clockwise rotation of the arm 4 is formed on the right side of the locking lever 10.

The locking lever 10 has the first locking portion 10f and the first locking portion 10f described above on the left side of FIGS.
Corresponding to the contact portion 10e and the first passage portion 10d, the second locking portion 10a, which is a rotation preventing portion, and the second switching cam portion, which have the same function with respect to the reverse rotation of the planetary arm 4, are provided. A contact portion 10b and a second passage portion 10c are formed.

A leaf switch 13 is integrally supported by the main body 1, and is arranged so that it is turned on when the locking lever 10 is in the first rotation position and turned off when it is in the second rotation position. , Outputs a signal to a control means (not shown).
The control means controls the drive motor and the like based on the input from the leaf switch 13 and the like.

The driving force transmission device of this embodiment is used as a driving device for a camera, and the driven gear 6 is rotated counterclockwise so that a focus adjusting device, which is a load mechanism, or an exposure device is exposed. Drive the adjuster. The driven gear 7 drives the film winding device, which is a load mechanism, by its clockwise rotation, and the driven gear 8 drives the film rewinding device, which is a load mechanism, by its clockwise rotation. .

The operation of the driving force transmission device of this embodiment having the above structure will be described. First, the initial state of the apparatus is in the state shown in FIGS. And
When a release signal is input by the release means (not shown), the drive motor is driven by the control means, and the sun gear 2 rotates counterclockwise. In the planetary arm 4, the planetary pin 5 comes into contact with the second locking portion 10a of the locking lever 10,
Counterclockwise rotation is blocked. Therefore, the planetary gear 3 rotates clockwise and the driven gear 6 rotates counterclockwise. The driven gear 6 drives a focus adjusting device and the like to perform an exposure operation.

After that, when the sun gear 2 is rotated clockwise, the planetary arm 4 is rotated clockwise. Planetary gear 3
After meshing with the internal gear 9, the planet pin 5 contacts the second contact portion 10b of the locking lever 10 as shown in FIGS. Then, the locking lever 10 is rotated clockwise by the clockwise rotation of the planetary arm 4, and the locking lever 10 is changed from the second rotation position to the first rotation position. The planetary arm 4 further rotates clockwise, and the planetary pin 5 contacts the first passage portion 10d as shown in FIGS. 6 and 7, and the planetary pin 5 moves downward as the planetary arm 4 rotates clockwise. Displace. At this time, the counterclockwise rotation urging force hardly acts on the locking lever 10 and holds the first rotation position.

The planetary arm 4 is further rotated in the clockwise direction to the state shown in FIGS. The planet pin 5 contacts the first locking portion 10f of the locking lever 10, the clockwise rotation of the planet arm 4 is blocked, and the driven gear 7 via the planet gear 3 is stopped.
Rotates clockwise. The clockwise rotation of the driven gear 7 drives the film winding device to wind the film by a predetermined amount. Then, the drive motor is reversely rotated, the sun gear 2 is rotated counterclockwise, and the planetary arm 4 is rotated counterclockwise. On the way, the locking lever 10 is moved to the first position.
The position is rotated counterclockwise from the position to the second position to return to the state shown in FIGS. Then stop the drive motor,
The single frame shooting sequence ends.

Next, the operation of the apparatus of this embodiment in the film rewinding sequence will be described. When an unillustrated rewind operation button is operated and a rewind signal is input, the drive motor is controlled to change the state of FIG. 2 to the state of FIG. Next, rotate the sun gear 2 counterclockwise,
As shown in FIG. 10, when the locking lever 10 turns from the first turning position to the second turning position and the leaf switch 13 turns from ON to OFF, the sun gear 2 is rotated clockwise. Let The rotation of the sun gear 2 causes the planetary arm 4 to move.
Rotates clockwise.

Then, as shown in FIG. 12, the planetary arm 4 contacts the pin 1c of the main body and stops at a position where the planetary gear 3 and the driven gear 8 mesh with each other. Further, when the sun gear 2 is rotated clockwise, the driven gear 8 rotates clockwise. This rotation rewinds the film. When the rewinding operation is completed, the sun gear 2 is rotated counterclockwise to return to the state of FIG. 2 and the operation is completed.

During the film winding operation (see FIG.
State), when the film reaches the end, similarly to the rewinding operation, the sun gear 2 is rotated counterclockwise to once bring it to the state of FIG. 10, and then the sun gear 2 is rotated clockwise. Then, the film is rewound in the state shown in FIG. After that, the sun gear 2 is rotated counterclockwise to return to the state of FIG. 2, and this operation is finished.

As described above, according to the driving force transmission device of the present embodiment, one driving motor can drive a plurality of load mechanisms, so that a small camera can be provided at low cost. Further, according to the present embodiment, since the transmission system of the driving force is switched by controlling the motor, highly reliable operation is performed. In addition, the time for controlling the drive motor is short in the case of single-frame shooting, and a camera with good usability can be provided.

Although the driving force transmission device of this embodiment is used as a driving device for a camera, any other loading device may be used as long as it drives a plurality of load mechanisms by using a motor. Further, even when it is applied to a camera, it may be applied to another load mechanism such as one that drives a mirror drive. Further, in this embodiment, the number of driven gears is three, but it is possible to easily add another driven gear to the lower left side of the driven gear 6 in FIG. Furthermore, in this embodiment,
The locking lever 10 is biased by a toggle spring 12 which is a holding means so as to be held at two rotational positions. A compression spring or the like is used as a holding means between the main body 1 and the locking lever 10. You may make it hold | maintain each rotation position by making it pinch and giving rotation frictional force.

[0026]

According to the driving force transmission device of the present invention, the driving of a plurality of driven gears can be switched in a short time by controlling the forward / reverse rotation of one driving motor, and the reliability is high and the occupied space is small. It is possible to provide a low-cost driving force transmission device.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main configuration of a driving force transmission device showing an embodiment of the present invention.

FIG. 2 is a plan view of the driving force transmission device of FIG. 1 in an operating state, showing a state in which a planetary gear meshes with one driven gear of a plurality of driven gears.

FIG. 3 is a development view of the AA ′ cross section in the operating state of FIG. 2;

4 is a plan view of the driving force transmission device of FIG. 1 in an operating state, showing a state in which a planetary gear is separated from the driven gear.

5 is a development view of the AA ′ cross section in the operating state of FIG.

6 is a plan view of the driving force transmission device of FIG. 1 in an operating state, showing a state before the planetary gear meshes with another driven gear. FIG.

FIG. 7 is a development view of the AA ′ cross section in the operating state of FIG. 6;

8 is a plan view of the driving force transmission device of FIG. 1 in an operating state, showing a state in which a planetary gear meshes with the other driven gear.

9 is a development view of the AA ′ cross section in the operating state of FIG. 8;

10 is a plan view of the driving force transmission device of FIG. 1 in an operating state, showing a state where the planetary gear revolves from the state of FIG. 8 and meshes with the internal teeth. 11 is a development view of a cross section taken along the line AA ′ in the operating state of FIG.

12 is a plan view of the driving force transmission device of FIG. 1 in an operating state, showing a state in which a planetary gear meshes with another driven gear.

FIG. 13 is a development view of the AA ′ cross section in the operating state of FIG. 12;

[Explanation of symbols]

 2 ………………… Sun gear 3 ………………… Planetary gear 4 ………………… Planetary arm 5 ………………… Planetary pin (projection means) 6, 7, 8… ………… Driven gear 10 …………………… Locking lever 10a …………………… Second locking part (rotation blocking part) 10b ……………… Second contact part ( Switching cam part) 10f …………………… 1st locking part (rotation blocking part) 10e ………………… 1st contact part (switching cam part) 12 ……………… Toggle spring (Holding means)

Claims (1)

[Claims] 1. A planetary gear mechanism including a planetary arm that rotates or revolves a planetary gear in association with the rotation of a sun gear; and a planetary gear mechanism that is arranged on the revolution orbit of the planetary gear and meshes with the planetary gear. A plurality of driven gears for driving the load mechanism, a projection means provided on the planetary arm on the planetary gear side and movable with respect to the planetary arm, and a rotation of the projection means associated with the revolution of the planetary gear,
It moves between a first rotation position and a second rotation position, and when it moves to the first or second rotation position, the rotation of the protrusion means is blocked, and the driven unit is driven. While permitting the rotation of the rotation preventing portion that meshes the gear and the planetary gear and the protrusion means,
A locking lever having a switching cam portion for moving the locking lever to the first or second rotation position, and holding means for holding the locking lever at the first or second rotation position. A driving force transmission device comprising: