JP2628974B2 - Camera film winding mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small and inexpensive camera film winding mechanism.

[0002]

2. Description of the Related Art In a camera film winding mechanism, a spool is rotatably supported in a camera body, a drive motor is supported so as to be positioned in the spool, and a motor gear is mounted on a rotation shaft of the drive motor. A multi-stage reduction gear device is connected to the gear, and the sun gear of the oscillating gear device constituting the clutch mechanism meshes with the external transmission gear of the reduction gear device. This oscillating gear device is provided on a oscillating arm provided to be oscillatable about an axis, a sun gear rotating about the axis, and provided on a tip end of the oscillating arm, meshing with the sun gear. A rotating planetary gear so that the planetary gear of the oscillating gear device selectively meshes with the spool gear and the rewinding gear for transmitting the driving force to the rewinding mechanism at the oscillating position of the oscillating arm. Has become. When the drive motor rotates forward, the driving force is transmitted to the sun gear via the external transmission gear, and the sun gear or the planetary gear is configured to require a predetermined torque. When the drive motor is rotated in the opposite direction, the swing arm swings in the opposite direction, and the planetary gear becomes the rewind gear. Engage with each other to drive the rewind mechanism to rewind the film.

[0003]

As described above, since the camera film winding mechanism has a large number of gears incorporated therein, noise is generated during driving. In order to cope with this problem, noise reduction has been devised by using a gear made of resin, but there is a problem that noise generated from the drive motor cannot be eliminated. In addition, in the case of a resin gear, the module must be set large in order to secure the necessary tooth strength, which inevitably increases the pitch circle, which is against the demand for miniaturization.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a camera film winding mechanism capable of minimizing noise generation.

[0005]

The present invention has the following arrangement to achieve the above object. That is, a drive motor positioned and supported in the spool , a motor gear mounted on the rotation shaft of the drive motor, and a connection to the motor gear
And can rotate freely between the reduction gear support and the head case.
Reduction gear device supported on the shaft, a sun gear rotating on a swing arm provided swingably about the shaft, and a planetary gear meshing with the sun gear on the tip of the swing arm. Wherein the sun gear is provided with an oscillating gear device meshing with the external transmission gear of the reduction gear device, wherein the planetary gear of the oscillating gear device is a spool gear or a spool at an oscillating position of an oscillating arm. In a camera film winding mechanism selectively meshing with a winding gear for transmitting a driving force to a gear and a rewind gear for transmitting a driving force to a rewinding mechanism, the reduction gear
The vehicle support 12 is fitted into the spool 10 and is relatively
A support portion 12a made of a hard and strong resin;
Resin or rubber which is disposed in close contact with the bottom side of the portion 12a
Having a supporting portion 12b made of a soft material having a high quality.
The tool 10 rotates on the support 12a of the reduction gear support 12.
The drive motor 14 is supported by the support portion 12b.
The support portion 1 is disposed on the bottom surface side and sandwiches the support portion 12b.
2a together with the support portion 12b by the screw 15
The drive mode is fixed and located in the spool 10.
The rotation shaft 16 of the support 14 is supported on the bottom surfaces of the support portions 12a and 12b
Penetrates through holes provided on the support portions 12a and 12b
The motor gear 1 made of a soft material is provided on the rotating shaft 16.
7 , the motor gear 1 in the reduction gear device.
The first reduction gear 22 meshing with the first gear 7 is formed of a soft material.
Before the head cover 21 and the soft material
It is characterized by being rotatably supported between the support portion 12b .

[0006]

When the drive motor rotates in the normal rotation direction, the external transmission gear 25 is rotated in a predetermined direction via the motor gear 17, the reduction spur gear 22, and the reduction spur gear 24, whereby the sun gear 30 is rotated. However, since the sun gear 30 meshes with the planetary gear 31 that requires a predetermined rotational torque, the rotation of the sun gear 30 also requires a predetermined rotational torque. Planetary gear 3
1 meshes with the spool gear 11, and the spool 10 is rotated in the film winding direction to wind up the film. When the drive motor 14 is rotated in the opposite direction, the swing arm 28
Is swung in the opposite direction, the planetary gear 31 rotates the rewind gear 35, and the film is rewound into the cartridge by a known mechanism. And the motor gear 17 rotating at high speed and the first
Since the reduction gear 22 is formed of a soft material, noise generated between the two can be reduced as much as possible. Further, since the supporting portion 12b to which the drive motor 14 is fixed and the first reduction gear 22 and the like are supported is also formed of a soft material,
The support portion 12b has a vibration damping property, and has a function of absorbing vibration of the drive motor 14, the first reduction gear 22, and the like, and further absorbing noise from the drive motor 14.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 and 3 are development views of gear groups of the film winding mechanism, and FIG. 2 is a plan view. In the figure, reference numeral 10 denotes a cylindrical spool having a spool gear 11 formed on the outer periphery of one end thereof and rotatably supported on a reduction gear support 12 about an axis. Although not shown, a feed claw that fits into the feed hole of the film is provided in the middle of the spool 10. The reduction gear support 12 is divided into two parts, and includes a support portion 12a fitted into the spool 10 and a support portion 12b fitted on the bottom side of the support portion 12a. The support portion 12b is formed of a nylon 12 resin or a rubber soft material. The support portion 12a is made of a relatively hard and strong resin. Reference numeral 14 denotes a drive motor, and a screw 15
As a result, the main body is fixed to the bottom of the support portion 12b, and the main body is located inside the spool 10. The rotating shaft 16 of the motor is
The rotating shaft 16 projects through the through hole provided at the bottom of the supporting member 12b, and the tip of the rotating shaft 16 has a D-shaped cross section. The support portion 12a, the support portion 12b, and the drive motor 14 are integrally fastened together with a screw 15 with the support portion 12b made of a soft material as an intermediate portion. The support portion 12a protrudes outward across the end edge of the spool 10, and is fixed together with the head case 21 by screws 13 at the protruding portion (FIG. 3). Reference numeral 17 denotes a motor gear, which is fitted on the rotation shaft 16 of the drive motor 14 and rotated. The motor gear 17 is also made of a soft material of nylon 12 or a soft material of rubber. The number of teeth is 6 to 8 in order to make the reduction ratio as large as possible.
Set to a small number of sheets. The fitting hole of the motor gear 17 is formed in a cross section D, and the motor gear 17 is
6 and press-fitted onto the D-shaped section. By doing so, even if the motor gear 17 is formed of a soft material, it can be securely fixed to the rotating shaft 16.

Reference numeral 22 denotes a first reduction spur gear having two stages of a large-diameter gear 22a and a small-diameter gear 22b meshing with the motor gear 17, and 24 denotes a large-diameter gear 24a meshing with the gear 22b.
And a second reduction spur gear consisting of two stages of
An external transmission gear 25 meshes with the gear 24b of the reduction spur gear 24. The external transmission gear 25 is set so that its plate-shaped gear body straddles the edge of the spool 10 and a part of the teeth protrudes outside the spool 10.
The reduction spur gear 22 and the reduction spur gear 24 are arranged at a position corresponding to the spool 10 of the reduction gear support 12, and the support portion 12 b made of the soft material and the head case 21 are formed.
And is rotatably arranged between them. The external transmission gear 25 is rotatably supported between the support portion 12a and the head case 21.

Reference numeral 27 denotes a head case 21 and a camera body 2
6 is an oscillating gear device provided between the oscillating gear device and the oscillating gear device. Reference numeral 28 denotes a swing arm, which is mounted near the outside of the spool 10 near a shaft 29 supported by the head case 21 and the camera body 26 with a predetermined frictional force. Is provided. Reference numeral 30 denotes a sun gear fitted to the shaft 29. Reference numeral 31 denotes a swing arm 28 which is rotatable about a shaft 32 provided on the tip of the swing arm 28.
It is a planetary gear provided above and meshes with the sun gear 30. The planetary gear 31 is pivoted by the disc spring 33 so as to swing the arm 2.
8 and rotates with a predetermined frictional resistance against the swing arm 28. The planetary gear 31 meshes with the spool shaft 11 when the swing arm 28 swings in the direction of the spool 10. The planetary gear 31 meshes with the rewind gear 35 when swinging in the opposite direction of the spool 10. In addition, the planetary gear 3
1 is a spool shaft 1 via an appropriate hoisting gear (not shown).
1 may be engaged.

The external transmission gear 25 other than the motor gear 17, the reduction spur gear 22, and the reduction spur gear 24, the sun gear 30, and the planetary gear 31 are also made of synthetic resin. The large-diameter gear 22a of the first reduction gear 22 has a module of about 0.3 to
It is set as large as about 0.4. This is because the mechanical strength is reduced by forming a soft material, and therefore, by increasing the size of the module, the tooth strength is increased and the safety factor is increased. The engagement between the motor gear 17 and the large-diameter gear 22a of the first reduction gear 22 is performed by reducing the number of teeth of the motor gear 17 to 6 to 8 in order to increase the reduction ratio as much as possible.
Is set to one. Further, it is preferable to increase the shift coefficient of the motor gear 17 to increase the tooth profile coefficient, while setting the tooth profile coefficient of the large-diameter gear 22a meshed with the shift coefficient to a relatively small value so as to balance the two tooth strengths. The module of the small-diameter gear 22b of the first reduction gear 22 and the large-diameter gear 24a of the second reduction gear 24 meshing with the small-diameter gear 22b is 0.22 to 0.22.
The tooth width is set as small as about 0.35 and the tooth width is set large. Further, since the first reduction gear 22 is formed of a soft material and the second reduction gear 24 is formed of a resin having a relatively high strength, the first reduction gear 22 is formed of a resin having a relatively high strength. The small-diameter gear 22b shifts the tooth profile to a positive value to increase the tooth profile coefficient, while the large-diameter gear 2 of the second reduction gear 24
Reference numeral 4a shows that the tooth profile is displaced in the negative direction so that the tooth profile coefficient is reduced so that the two are balanced.

When the drive motor 14 is rotated in the normal direction, the external transmission gear 25 is rotated in a predetermined direction via the motor gear 17, the reduction spur gear 22, and the reduction spur gear 24. As a result, the sun gear 30 is rotated. Since the sun gear 30 meshes with the planetary gear 31 that requires a predetermined rotation torque, the rotation of the sun gear 30 also requires a predetermined rotation torque. The swing arm 28 is swung, and the planetary gear 31 becomes the spool gear 1.
1 and the spool 10 is rotated in the film winding direction to wind up the film. When the drive motor 14 is rotated in the opposite direction, the swing arm 28 is swung in the opposite direction, the planetary gear 31 rotates the rewind gear 35, and the film is rewound into the cartridge by a known mechanism. is there.

Since the motor gear 17 and the first reduction gear 22 that rotate at high speed are formed of soft materials, noise generated between them can be reduced as much as possible.
Further, since the support portion 12b to which the drive motor 14 is fixed is also formed of a soft material, the support portion 12b has a vibration proof property, and functions to absorb vibration of the drive motor 14 and further to absorb noise. . Motor gear 17 or first reduction gear 2
The decrease in strength due to the formation of 2 from a soft material can be compensated for by gear design of a module or the like.

Although the present invention has been described in detail with reference to the preferred embodiments, the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention. Of course.

[0014]

According to the present invention, as described above, since the motor gear rotating at high speed and the first reduction gear are made of soft material, noise generated between them is reduced as much as possible. Can be done. The drive motor is fixed, and the first
Since the supporting portion for supporting the reduction gears and the like is also formed of a soft material, the supporting portion has a vibration-proof property, and the drive motor and the first
In this case, the vibration of the reduction gear and the like can be absorbed, and the noise from the drive motor can be absorbed.

[Brief description of the drawings]

FIG. 1 is a development view of a gear group of a film winding mechanism.

FIG. 2 is a plan view of a gear group of the film winding mechanism.

FIG. 3 is a development view of a gear group of the film winding mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Spool 12 Reduction gear support 13 Screw 14 Drive motor 16 Rotation shaft 17 Motor gear 22, 24 Reduction spur gear 25 External transmission gear 27 Oscillating gear device 29, 32 shaft 30 Sun gear 31 Planetary gear 35 Rewind gear

Claims (1)

(57) [Claims] 1. A drive motor supported and supported in a spool , a motor gear mounted on a rotation shaft of the drive motor , a reduction gear support connected to the motor gear, and
A reduction gear device rotatably supported between the head case, a sun gear rotatable about an axis on a swing arm provided so as to be able to swing about an axis, and a tip end of the swing arm. A planetary gear meshing with a sun gear, the sun gear including a rocking gear device meshing with an external transmission gear of the reduction gear device, wherein the planetary gear of the rocking gear device is a rocking arm of a rocking arm. In the camera film winding mechanism, which selectively meshes with a spool gear or a winding gear for transmitting a driving force to the spool gear and a rewind gear for transmitting a driving force to the rewind mechanism in the moving position, the reduction gear support 12 fits in the spool 10
Support portion 12a made of a relatively hard and strong resin
And a resin layer disposed in close contact with the bottom side of the support portion 12a.
Rui has a support portion 12b made of a soft material of the rubber-based, the spool 10 is supported portion 12a of the reduction gear support 12
The drive motor 14 is rotatably supported on the upper side, and the drive motor 14 is disposed on the bottom side of the support portion 12b.
Then, a screw 15 is attached to the support portion 12a with the support portion 12b interposed therebetween.
Is fastened and fixed together with the support portion 12b by the
The rotary shaft 16 of the drive motor 14 is located in the support portion 12a, 1
2b penetrate through holes provided in the bottom surface and support portions 12a, 12b
The motor is extended upward and the rotation shaft 16 is formed of a soft material.
Gear 17 is fitted and meshes with the motor gear 17 in the reduction gear device.
The first reduction gear 22 is made of a soft material and
The head cover 21 and the support portion 12b made of a soft material
A camera film winding mechanism, which is rotatably supported between the camera film and the camera.