JPH07191392A - Film winding-up mechanism for camera - Google Patents

Abstract

PURPOSE:To provide the film winding-up mechanism for a camera constituted so that the design of a reduction gear ratio or the like is facilitated and the cost thereof is reduced without sacrificing its miniaturization. CONSTITUTION:A reduction gear device 27 is constituted of two reduction spur gear of two steps and pivoted between a supporting part 13 and a head case 21 covering the supporting part 13 so as to be freely turned. The first reduction gear 22 is provided with the large-diameter gear 22a positioned on the supporting part 13 side and the small-diameter gear 22b positioned on the case 21 side. Besides, the gear 22a is meshed with a motor gear 17 and the gear 22b is meshed with the large-diameter gear 24a of the second reduction gear 24. The second gear 24 is provided with the large-diameter gear 24a positioned on the case 21 side and the small-diameter gear 24b positioned on the supporting part 13 side. Besides, the gear 24b is exposed outside from the end part of a spool 10 and used also as an external transmission gear. The oscillation arm 28 of an oscillation gear device 27 is disposed at almost the same height position as the gear 24a of the gear 24. Besides, a sun gear 30 and planet gear 31 are provided so as to be positioned on the supporting part 13 side of the arm 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera film winding mechanism which can be formed compactly and inexpensively.

[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 that the body is located in the spool, and a motor gear is attached to a rotation shaft of the drive motor. A multi-stage reduction gear device is connected to the motor gear, and an external transmission gear of the reduction gear device is meshed with a sun gear of an oscillating gear device forming a clutch mechanism. This oscillating gear device is provided on a oscillating arm that is oscillated about an axis and is provided on a sun gear that rotates about the axis and on the tip of the oscillating arm, and meshes with the sun gear. A planetary gear that rotates, wherein the planetary gear of the oscillating gear device selectively meshes with the spool gear and the rewinding gear that transmits the driving force to the rewinding mechanism at the oscillating position of the oscillating arm. Has become. When the drive motor rotates in the normal direction, the driving force is transmitted to the sun gear through the external transmission gear, and the sun gear or the planet 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 is used as the rewinding gear. Mesh to drive the rewinding mechanism to rewind the film.

[0003]

By the way, since the camera tends to be further miniaturized, there is a strong demand for miniaturization of the camera film winding mechanism incorporated therein. The miniaturization of the camera film winding mechanism depends largely on the arrangement of the gear groups of the reduction gear device. The inventor is the Japanese Patent Application No. 5-
As shown in No. 108175, a plurality of reduction spur gears are two-dimensionally arranged in the area of the spool, and a single-stage spur gear that straddles the spool edge is provided between the reduction gear and an externally provided oscillating gear device. Attempted flattening by connecting with the external transmission gear. However, in the above camera film winding mechanism,
A large number of reduction gears must be arranged in a narrow spool area, and there are many design restrictions such as reduction ratio.

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to facilitate the design of the reduction ratio and the like without sacrificing downsizing, and to reduce the cost. It is to provide a camera film winding mechanism that can be achieved.

[0005]

The present invention has the following constitution in order to achieve the above object. That is, a spool rotatably supported in the camera body, a drive motor positioned and supported in the spool, a motor gear attached to the rotation shaft of the drive motor, and a motor gear connected to the motor gear. A reduction gear device, a sun gear that rotates about the shaft on a swing arm that is swingably provided around the shaft, and a planetary gear that meshes with the sun gear on the tip of the swing arm, The sun gear includes an oscillating gear device that meshes with an external transmission gear of the reduction gear device, and the planetary gear of the oscillating gear device is a oscillating position of an oscillating arm, and a driving force is applied to a spool gear or a spool gear. In a camera film winding mechanism that selectively meshes with a winding gear that transmits the force and a rewinding gear that transmits the driving force to the rewinding mechanism, the spool has a supporting portion extending from the reduction gear support body fitted therein. The drive motor is rotatably supported on the support portion, the drive motor is fixed to the bottom surface of the support portion and is located in the spool, and the rotation shaft of the drive motor is supported by penetrating a through hole provided in the bottom surface of the support portion. The motor gear is fitted to a rotary shaft on the support portion, and the reduction gear device is composed of two two-stage reduction spur gears, each of which includes the support portion and the support portion. The first reduction gear is rotatably supported between the covering head cases, and the first reduction gear is provided such that a large diameter gear is located on the support portion side and a small diameter gear is located on the head case side. A small-diameter gear meshes with a large-diameter gear of the second reduction gear, and the second reduction gear has the large-diameter gear on the head case side and the small-diameter gear on the support portion side. And the small-diameter gear is exposed outside the end of the spool. Is also used as the external transmission gear, and the swing arm of the swing gear device is disposed at substantially the same height as the large-diameter gear of the second reduction gear, and the support portion of the swing arm is provided. It is characterized in that the sun gear and the planetary gear are provided on the side.

[0006]

According to the present invention, each gear of the second reduction spur gear is exposed to the outside of the end surface of the spool.
That is, since there is no spatial obstacle to the spool, the size of the second reduction spur gear can be arbitrarily set, and the reduction ratio can be easily designed. Further, the position of the rocking arm is set at substantially the same height as the large-diameter gear located outside the second reduction spur gear, and the sun gear and the planetary gears are arranged on the supporting part side of the rocking arm. . As a result, even if the large-diameter gear and the small-diameter gear of the second reduction spur gear are positioned outside the end surface of the spool as described above, the sun gear and the planet gears project further outward than this. The height of the camera is not so high because it is not.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a development view of a gear group of the film winding mechanism, and FIG. 2 is a plan view. In the figure, 1
Reference numeral 0 is a cylindrical spool, and a spool gear 11 is formed on the outer periphery of one end of the spool, and is supported on a support portion 13 extending from a reduction gear support 12 so as to be rotatable 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. 1
Reference numeral 4 denotes a drive motor, which is fixed to the bottom portion of the support portion 13 by a screw 15 and the main body is located inside the spool 10. The rotating shaft 16 of the motor penetrates through a through hole provided at the bottom of the supporting portion 13 and projects onto the supporting portion 13, and the tip end of the rotating shaft 16 is formed in a D-shaped cross section. Reference numeral 17 denotes a motor gear, which is integrally formed of synthetic resin and includes a boss portion 18, a shaft portion 19, and a tooth portion 20. The motor gear 17 is the boss 1
8 is formed in a fitting hole having a D-shaped cross section and is 0.0
Rotating shaft 1 with clearance of about 1 to 0.04 mm
6 is fitted and rotates together with the rotary shaft 16. Further, the motor gear 17 is supported at both ends by being supported by the head case 21 forming a lid at the tip end of the shaft portion 19 of the motor gear 17 so as to prevent shaft runout. The tooth portion 20 formed on the outer circumference of the shaft portion 19 is set so that the tooth bottom has a smaller diameter than the rotating shaft 16. The motor gear 17 has a small number of teeth of 5 to 7. In the present embodiment, the clearance between the shaft portion 19 and the bearing 21a is set to about 0.01 to 0.15 mm, which is about 5 times the normal clearance. The reduction gear support 12 is fastened together with the head case 21 and the camera body 26 by screws (not shown) and fixed.

Reference numeral 22 is a first reduction spur gear consisting of two stages, a large-diameter gear 22a and a small-diameter gear 22b, which mesh with the motor gear 17, and are rotatably supported by the support 13 and the head case 21. . Reference numeral 24 is a second reduction spur gear consisting of two stages, a large-diameter gear 24a meshing with the gear 22b and a small-diameter gear 24b, which is rotatably supported by the support portion 13 and the head case 21. The second reduction spur gear 24 also serves as an external transmission gear as described later. In this embodiment, the large diameter gear 24a and the small diameter gear 24b are the spool 1
It straddles the edge of 0. The arrangement and meshing relationship of the motor gear 17, the first and second reduction spur gears will be described in more detail.
In the first reduction gear 22, a large diameter gear 22a is provided on the support portion 13 side, and a small diameter gear 22b is provided on the head case 21 side, so that the large diameter gear 22a is provided on the motor gear 17. , The small diameter gear 22b is the second reduction gear 2
4 is engaged with a large diameter gear 24a, and the second reduction gear 24 has a large diameter gear 24a on the head case 21 side.
A small-diameter gear 24b is provided on the side of the support portion 13, and the small-diameter gear 24b is exposed outward from the end of the spool 10 and is also used as an external transmission gear, which meshes with a sun gear described later. To do.

27 is a head case 21 and a camera body 2.
6 is an oscillating gear device installed between 28 is a swing arm of the swing arm, which is mounted on the shaft 29, which is located near the outside of the spool 10 and is supported by the head case 21 and the reduction gear support 12, with a predetermined frictional force, and swings about the shaft 29. It is provided freely. Reference numeral 30 is a sun gear fitted to the shaft 29. Reference numeral 31 denotes a swing arm 2 which is rotatable about a shaft 32 provided on the tip of the swing arm 28.
8 is a planetary gear provided on the gear 8 and meshes with the sun gear 30. The planetary gear 31 is pressed against the swing arm 28 by the disc spring 33 and rotates with a predetermined frictional resistance with respect to the swing arm 28. In this embodiment, the swing arm 28
The sun gear 30 and the planetary gear 31 are arranged on the side of the support portion 13 of the swing arm 28, and the position of the sun gear 30 and the planetary gear 31 are located at substantially the same height as the large diameter gear 24a located outside the reduction spur gear 24. Thereby, as described above, the second reduction spur gear 24
The large diameter gear 24a and the small diameter gear 24b of the spool 1
Even if the sun gear 30 and the planetary gear 31 are located outside the end surface of 0, the sun gear 30 and the planetary gear 31 do not project further than this, so that the height of the camera does not become so high. The planet gear 31 meshes with the spool gear 11 when the swing arm 28 swings toward the spool 10. Further, the planetary gear 31 meshes with the rewinding gear 35 when it is swung in the direction opposite to the spool 10 (FIG. 2). The planet gear 31 may be meshed with the spool shaft 11 via an appropriate hoisting gear (not shown).

The motor gear 17, the reduction spur gear 22, the reduction spur gear 24, the sun gear 30, and the planetary gear 31 are all made of synthetic resin. In this case, the gear group, especially the motor gear 17, the reduction spur gear 22, and the reduction spur gear 24 are preferably formed of the following special synthetic resin material. That is, a relatively soft synthetic resin material in which a lubricant such as fluorine or olefin and whiskers such as potassium titanate are mixed in special nylon, or a reinforced synthetic resin material in which glass fiber is mixed in special nylon. To form. It is preferable to configure the gear group so that the gear made of the soft synthetic resin material and the gear made of the reinforced synthetic resin material are meshed with each other.

With the above construction, when the drive motor 14 rotates in the normal direction, the reduction spur gear 24 is rotated in a predetermined direction via the motor gear 17 and the reduction spur gear 22, and thereby the sun gear 30. However, since the sun gear 30 meshes with the planetary gear 31 that requires a predetermined rotation torque, a predetermined rotation torque is required for the rotation of the sun gear 30. It is rocked, the planetary gear 31 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 rewinding gear 35, and the film is rewound into the cartridge by a known mechanism. is there.

As described above, the respective gears of the second reduction spur gear 24 are exposed to the outside of the end surface of the spool 10, that is, the spool 10 is not spatially obstructed. Therefore, the size of the second reduction spur gear 24 can be arbitrarily set, and the reduction ratio can be easily designed. Further, the position of the swing arm 28 is set to the speed reduction spur gear 2
4, and the sun gear 30 and the planetary gear 31 are set at substantially the same height as the large-diameter gear 24a located on the outer side of the rocking arm 2.
8 are arranged on the side of the support portion 13. Accordingly, even if the large diameter gear 24a and the small diameter gear 24b of the second reduction spur gear 24 are positioned outside the end surface of the spool 10 as described above, the sun gear 30 and the planetary gear 31 are However, since it does not project outward, the height of the camera is not so high. Further, by configuring the gear group such that the gear made of the above-mentioned soft synthetic resin material and the gear made of the reinforced synthetic resin material are alternately meshed with each other, wear of the gear can be reduced. The device can be made relatively thin, which also makes it possible to reduce the size of the device. By the way, it seems that wear can be prevented if all the gears are made of a reinforced synthetic resin material having high strength, but the mixed glass fibers act in a sandpaper-like manner, increasing wear on the contrary.

Further, as described above, the tooth portion 2 of the motor gear 17 is
0 is set so that its root has a diameter smaller than that of the rotary shaft 16. Moreover, by setting the diameter of the shaft portion 19 to be small in the tooth portion 20, the root diameter can be freely set to be small. Therefore, the number of teeth of the tooth portion 20 is small, for example, conventionally, only about 8 to 9 can be set, but in the present embodiment, it can be set to about 5 to 7, and the reduction ratio can be increased.

[0014]

According to the present invention, the respective gears of the second reduction spur gear are exposed to the outside of the end surface of the spool, that is, there is no spatial obstacle to the spool. Therefore, the size of the second reduction spur gear can be arbitrarily set, and the reduction ratio can be easily designed. Further, the position of the rocking arm is set at substantially the same height as the large-diameter gear located outside the second reduction spur gear, and the sun gear and the planetary gears are arranged on the supporting part side of the rocking arm. . As a result, even if the large-diameter gear and the small-diameter gear of the second reduction spur gear are positioned outside the end surface of the spool as described above, the sun gear and the planet gears project further outward than this. The height of the camera is not so high because it is not.

[Brief description of 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 a film winding mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Spool 12 Reduction gear support 13 Support part 14 Drive motor 16 Rotating shaft 18 Boss part 19 Shaft part 20 Tooth part 22, 24 Reduction spur gear 27 Oscillating gear device 29, 32 Shaft 30 Sun gear 31 Planetary gear 35 Rewinding gear

Claims (1)

[Claims] 1. A spool rotatably supported in a camera body, a drive motor positioned and supported in the spool, a motor gear attached to a rotation shaft of the drive motor, and a motor gear. A reduction gear device connected to the sun gear, a sun gear that rotates on the swing arm that is swingably provided around the shaft, and a planetary gear that meshes with the sun gear on the tip of the swing arm. A planetary gear of the oscillating gear device, wherein the sun gear is in mesh with an external transmission gear of the reduction gear device, and the planet gear of the oscillating gear device is in a oscillating position of an oscillating arm. In a camera film winding mechanism that selectively meshes with a hoisting gear that transmits a driving force to a rewinding mechanism and a rewinding gear that transmits a driving force to a rewinding mechanism, the spool includes a support portion extending from a reduction gear support. Insert And is rotatably supported on the support portion, the drive motor is fixed to the bottom surface of the support portion and is located in the spool, and the rotation shaft of the drive motor penetrates a through hole provided in the bottom surface of the support portion. And the motor gear is fitted to a rotation shaft on the support portion, and the reduction gear device is composed of two two-stage reduction spur gears. The first reduction gear is rotatably supported between head cases that cover a portion, and the first reduction gear is a large-diameter gear in which a large-diameter gear is located on the support portion side and a small-diameter gear is located on the headcase side. Is meshed with the motor gear, a small diameter gear is meshed with a large diameter gear of the second reduction gear, and the second reduction gear has a large diameter gear on the head case side and a small diameter gear on the support portion side. And the small-diameter gear is located outside the end of the spool. It is exposed and also serves as the external transmission gear, and the oscillating arm of the oscillating gear device is arranged at substantially the same height position as the large-diameter gear of the second reduction gear,
A camera film winding mechanism, wherein the sun gear and a planetary gear are provided on the supporting portion side of the swing arm.