JP3253767B2 - Camera drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera driving device , and more particularly to a camera driving device having a rotating shaft member.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Application No. 54-41607 proposes a technical means in which a rotating shaft of a motor is rotatably supported at two points. Also, Japanese Patent Application Laid-Open No. 62-187332
In the official gazette, the rotating shaft of the sprocket is supported at two points,
A mechanism that rotates from a gear attached to the sprocket is disclosed.

[0003]

However, in the technical means disclosed in Japanese Patent Application No. 54-41607, the shaft may be bent when a large load is applied to the worm gear because of the two-point shaft support. In the technical means disclosed in Japanese Patent Application Laid-Open No. 62-187332, if an overload is applied in the direction opposite to the rotation direction of the sprocket during hoisting, the rotation shaft of the sprocket may be bent because it is supported at two points.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a camera driving device for preventing a bending of a rotary drive shaft when an overload is applied to the rotary drive shaft. Aim.

[0005]

Means and operation for solving the problems] driving device of the first camera that by the present invention for achieving the above object
Includes an input gear, the upper fill force gear is provided at one side, a rotary shaft that rotates the input gear integrally provided at the other end of the rotating shaft to rotate integrally with the rotating shaft An output gear , arranged in a predetermined direction with respect to the rotation axis,
Engage with the input gear and apply the driving force from the drive source to the input gear.
The drive gear transmitted to the gear, and the above
A driven gear which is arranged in a predetermined direction, is engaged with the output gear, and is driven by the output gear, an engagement relationship between the drive gear and the input gear at the time of transmitting a driving force, and the output gear and the driven gear. A bend preventing unit that prevents the rotating shaft from being bent by a separating force that separates a distance between the respective gears generated by an engagement relationship with the drive gear, wherein the bend preventing unit is configured to extend in a direction along the rotating shaft. In addition, it is provided between the input gear and the output gear, and is arranged so as to have a minute space in the radial direction with respect to the rotation shaft. Books to achieve the above objectives
A driving device for a second camera according to the invention includes an input gear,
The input gear is provided at one end, and is connected to the input gear.
A rotating shaft that rotates physically, and a rotating shaft provided at the other end of the rotating shaft.
An output gear that rotates integrally with the rotating shaft;
It is arranged in a predetermined direction with respect to the turning shaft and engages with the input gear
Drive to transmit the driving force from the driving source to the input gear
Gear and the output gear.
When driven, the drive gear and the input gear
The drive gear and the input gear generated by the engagement relationship
The above output in almost the same direction as the separating force to separate the distance between
Driven gear located at a position that applies a separating force to the gear
Prevents the rotating shaft from being bent by the separating force
And a bend preventing part, wherein the bend preventing part is
In the direction along the axis of rotation, the input gear and the output gear
Between the rotary shaft and the radial axis
It is characterized by being arranged to have a space. the above
In order to achieve the object described above, the driving of the third camera according to the present invention is performed.
The driving device is connected to the driving device of the first or second camera.
And the bending prevention unit is configured to apply the separation force to the rotation shaft.
Is provided in a direction in which the occurrence occurs. above
Driving a fourth camera according to the present invention to achieve the object
The apparatus as set forth in the third camera driving device, further comprising:
The fold prevention portion is arranged to cover a part of the outer periphery of the rotation shaft.
It is characterized by being performed.

[0006]

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

FIG. 1 is a perspective view showing a film feeding apparatus according to a first embodiment of the present invention.

As shown in the figure, a motor 1a is fixed to a camera body (not shown) and is rotatable in both forward and reverse directions. A pinion gear (not shown) is integrally attached to the end of the rotating shaft. Further, a known planetary gear mechanism 1b having a rotation axis coaxially with the rotation axis of the motor 1a and meshing with the pinion gear is disposed at the tip of the motor 1a. The planetary gear mechanism 1
The output gear 2 is provided integrally with the output shaft b.

On the other hand, a take-up spool (not shown) for taking up a film is rotatably disposed in a spool chamber formed on one side of the camera body. One end of the take-up spool is provided at one end of the take-up spool. A spool gear 4 that rotates integrally with the take-up spool is provided.

A rotary drive shaft 3a is disposed substantially parallel to the central axis of the motor 1a. An input gear meshable with the output gear 2 is provided at a position on the rotary drive shaft 3a facing the output gear 2. A gear 3b is provided at a position facing the spool gear 4 so that an SP worm gear 3c is rotated integrally with the rotary drive shaft 3a. The input gear 3b and the SP worm gear 3c are provided separately from the rotary drive shaft 3a and are integrally disposed as long as the input gear 3b and the SP worm gear 3c transmit or transmit the rotary drive force to the rotary drive shaft 3a. You don't have to.

Further, one end of the rotary drive shaft 3a, that is, the further end of the input gear 3b, is connected to a shaft support member 5a fixed to a camera body (not shown) and one end of the shaft support member 5a. It is rotatably supported by a bearing formed by the shaft support member 6a to be engaged.

FIG. 2 shows the shaft support members 5a and 6
FIG. 4 is a side view of a main part showing a state in which the rotation drive shaft 3a is inserted into a bearing formed by a.

As shown in the drawing, a U-shaped groove is formed in an engagement portion of the shaft support member 5a at one end with the shaft support member 6a, and an engagement between the U-shaped groove and the shaft support member 6a is formed. The bearing portion is formed with the mating surface.

Further, the direction of the other end of the rotary drive shaft 3a,
In other words, a shaft supporting member 5b and a shaft supporting member 6b having the same shape as the shaft supporting member 5a and 6a are fixed to the camera body in a further distal direction of the SP worm gear 3c. The shaft support member 5b
The other end of the rotation drive shaft 3a is rotatably supported by a bearing formed by the U-shaped groove and the shaft support member 6b.

The rotary drive shaft 3 is located between the input gear 3b and the SP worm gear 3c and near the input gear 3b and the SP worm gear 3c.
The bending prevention members 7a and 7b of a are provided.

FIG. 3 is a side view of a main part showing a positional relationship between the bending preventing members 7a and 7b and the rotary drive shaft 3a.

The bending preventing members 7a and 7b have a base end fixed to the camera body, and a notch formed at a portion of the distal end opposed to the rotary drive shaft 3a, and are radially connected to the rotary drive shaft 3a. A space having a small gap in the direction is formed.

In the film feeding apparatus of the first embodiment having such a configuration, the rotational driving force of the motor 1a is transmitted to the input gear 3b through the well-known planetary gear mechanism 1b and the output gear 2. Further, it is transmitted to the spool gear 4 via the rotary drive shaft 3a and the SP worm gear 3c.

FIG. 4 is a cross-sectional view of an essential part showing a cross section AA in FIG.

As shown in FIG. 4, the input gear 3b
From the output gear 2 by the driving force from the motor 1a.
As a result, a force Fa is applied to the shaft supporting members 5a and 6a from the rotary drive shaft 3a (see FIG. 2).
When this force Fa is a force worthy of bending the rotary drive shaft 3a, when the rotary drive shaft 3a is bent, the rotary drive shaft 3a is received by the bending preventing member 7a, and the force applied to the input gear 3b is reduced. The shaft supporting members 5a and 6a and the bending preventing member 7a are rotatably received at two points.

FIG. 6 shows a state in which the rotary drive shaft 3 is mounted on the bearing formed by the shaft support members 5a and 6a when a bending drive force is applied to the rotary drive shaft in the first embodiment.
It is the principal part side view which showed the state which a has penetrated. FIG. 7 is a side view of a main part showing a positional relationship between the bending preventing members 7a and 7b and the rotary drive shaft 3a when a bending drive force is applied to the rotary drive shaft. In the figure, the symbol f1
a, f1b, f2a, f2b are the bearing parts after the shaft deformation, respectively.
Indicates the force acting on the.

FIG. 5 is a cross-sectional view of a main part showing a cross section taken along line BB in FIG.

As shown in FIG. 5, the SP worm gear 3c also receives the force Fsp from the spool gear 4 by the driving force from the motor 1a, as in the case of the input gear 3b, whereby the shaft support members 5b and 6b Applies a force Fb from the rotary drive shaft 3a (see FIG. 2). When this force Fb is a force worthy of bending the rotary drive shaft 3a, when the rotary drive shaft 3a is bent, the rotary drive shaft 3a is received by the bending preventing member 7b and is applied to the SP worm gear 3c. To the shaft supporting members 5b, 6b and the bending prevention member 7b.
(See FIGS. 6 and 7).

According to the film feeder of the first embodiment, an overload is applied to the input gear 3b and the SP worm gear 3c to the extent that the rotary drive shaft 3a is bent.
As a result, even if the rotary drive shaft 3a is bent, the rotary drive shaft 3a abuts on the distal ends of the bending preventing members 7a and 7b, thereby applying the force applied by the rotary drive shaft 3a to the shaft support members 5a, 5b, 6a and 6b. Is received by the shaft supporting members 5a, 5b, 6a, 6b and the bending preventing members 7a, 7b, whereby the bending of the rotary drive shaft 3a can be prevented. Therefore, bending of the rotating shaft of the gear means can be prevented.

FIG. 8A is a perspective view showing a film feeding apparatus according to a second embodiment of the present invention.

The second embodiment differs from the first embodiment in that the shape and arrangement of the bending preventing member are different.
The configuration is the same as that of the first embodiment.

FIG. 8B is a side view of a main part showing a positional relationship between the bending preventing member 17 and the rotary drive shaft 3a in the second embodiment.

As shown in FIG.
A minute space similar to that of the first embodiment is formed between the distal end of the motor and the rotary drive shaft 3a, and the same effect can be obtained.

FIG. 9A is a perspective view showing a film feeding apparatus according to a third embodiment of the present invention.

The third embodiment has the same structure as that of the first embodiment except that the shape of the bending preventing member is different from that of the first embodiment.

FIG. 9B is a side view of a main portion showing a positional relationship between the bending preventing members 27a and 27b and the rotary drive shaft 3a in the third embodiment.

As shown in FIG.
A U-shaped groove is formed at the end of each of the a and 27b so as to receive the rotary drive shaft 3a. As in the first embodiment, a minute groove is formed between the U-shaped groove and the rotary drive shaft 3a. Since a space is formed, a similar effect can be obtained.

FIG. 10 is a perspective view showing a film feeding apparatus according to a fourth embodiment of the present invention.

While the first embodiment has two bend preventing members, the fourth embodiment has one bend preventing member near the input gear 3b. Other configurations are the same as in the first embodiment.

In the fourth embodiment, the same effect as that of the first embodiment can be obtained with a smaller number of members.

[0036]

As described above, according to the present invention, it is possible to provide a camera driving device which prevents a bending of a rotary drive shaft when an overload is applied to the rotary drive shaft.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a film feeding apparatus according to a first embodiment of the present invention.

FIG. 2 is a side view of a main part of the first embodiment, showing a state where a rotary drive shaft is inserted into a bearing portion of a shaft support member.

FIG. 3 is a side view of a main part showing a positional relationship between a bending preventing member and a rotary drive shaft in the first embodiment.

FIG. 4 is a sectional view of an essential part showing a section taken along the line AA in FIG. 1;

FIG. 5 is a cross-sectional view of a main part showing a BB cross section in FIG. 1;

FIG. 6 is a main part side view showing a state where the rotary drive shaft is inserted into the bearing portion of the shaft support member when a bending drive force is applied to the rotary drive shaft in the first embodiment.

FIG. 7 is a side view of a main part showing a positional relationship between the bending preventing member and the rotary drive shaft when a bending drive force is applied to the rotary drive shaft in the first embodiment.

FIG. 8A is a perspective view showing a film feeding device according to a second embodiment of the present invention, and FIG. 8B is a positional relationship between a bending preventing member and a rotation drive shaft according to the second embodiment. It is the principal part side view which showed.

FIG. 9A is a perspective view showing a film feeding device according to a third embodiment of the present invention, and FIG. 9B is a positional relationship between a bending preventing member and a rotary drive shaft according to the third embodiment. It is the principal part side view which showed.

FIG. 10 is a perspective view showing a film feeding apparatus according to a fourth embodiment of the present invention.

[Explanation of symbols]

 1a: motor 1b: planetary gear mechanism 2: output gear 3a: rotary drive shaft 3b: input gear 3c: SP worm gear 4: spool gear 5a, 5b: shaft support member 6a, 6b: shaft support member 7a, 7b: bending prevention Element

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-122897 (JP, A) JP-A 63-155127 (JP, U)

Claims (4)

(57) [Claims] And 1. A input gear, the upper fill force gear is provided at one side, a rotary shaft that rotates the input gear integrally provided at the other end of the rotating shaft, integrally with the rotating shaft An output gear that rotates in a predetermined direction with respect to the rotation shaft;
To transmit the driving force from the driving source to the input gear.
A drive gear that, the rotating shaft to be arranged in the predetermined direction, engages and the output gear, and a driven gear driven by said output gear, said drive gear when driving power transmission and the said input gear A bend preventing unit that prevents the rotating shaft from being bent by a separation force that separates a distance between the respective gears generated by the engagement relationship between the output gear and the driven gear. The camera, wherein the bend preventing portion is provided between the input gear and the output gear in a direction along the rotation axis, and is arranged so as to have a minute space in a radial direction with respect to the rotation axis. Drive. 2. An input gear, wherein the input gear is provided at one end side, and is connected to the input gear.
A rotating shaft that rotates physically, and a rotating shaft that is provided at the other end of the rotating shaft and rotates integrally with the rotating shaft
An output gear that rotates , and an input gear that is disposed in a predetermined direction with respect to the rotation shaft,
To transmit the driving force from the driving source to the input gear.
Drive gear, which is engaged with the output gear, and is driven by the output gear.
The engagement relationship between the drive gear and the input gear
Resulting distance between the drive gear and the input gear
Release to the output gear in the same direction as the separation force to separate the separation.
A driven gear disposed at a position for applying an intermediate force, and preventing the rotating shaft from being bent by the separating force.
Comprising a bent preventing portion, the bent prevention part in a direction along said rotation shaft, the input formate
Gear and the output gear, and
It is arranged to have a small space in the radial direction
A driving device for a camera, comprising: 3. The anti-bending portion is provided with respect to the rotating shaft.
The contractor is provided in a direction in which a separating force is generated.
3. The camera driving device according to claim 1 or 2 . 4. The anti-bending portion is provided on one side of the outer periphery of the rotating shaft.
4. The device according to claim 3, wherein the cover is arranged to cover the portion.
The driving device of the camera.