JPH05142633A - Film winding mechanism for camera - Google Patents

Abstract

PURPOSE:To provide a film winding mechanism for a camera which is formed to be small in size and whose cost is reduced. CONSTITUTION:By fitting a blind cylindrical supporting part 13 which is provided in a head case 12, a spool shaft 10 is rotatably supported on the supporting part 13, and the main body of a driving motor 14 is screwed on the base of the supporting part 13 to be positioned in the spool shaft 10. The rotary shaft of the motor 14 penetrates a hole provided on the base of the supporting part 13 to be extended in the supporting part 13, and a motor shaft gear 17 is fitted in the rotary shaft 16 in the supporting part 13. A reduction gear device 26 is constituted by arranging and meshing plural spur gear groups in a plane state, and arranged in the supporting part 13. A rocking gear device 27 is arranged in the head case 12 and the external transmission gear 25 of the device 26 and/or the sun gear 30 of the device 27 is arranged to be laid across the edge of the spool shaft 10, then the gear 25 meshes with the gear 30.

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 made compact.

[0002]

2. Description of the Related Art In a conventional camera film winding mechanism, a spool shaft is rotatably supported in a camera body, and a drive motor is supported so that the body is positioned in the spool shaft.
A motor shaft gear is attached to a rotary shaft of a drive motor, and a multi-stage reduction gear device including a planetary gear mechanism is connected to the motor shaft gear, and an external transmission gear of this reduction gear device is an oscillating gear that constitutes a clutch mechanism. The sun gear of the device is geared. This oscillating gear device is provided on a oscillating arm that is oscillatably provided around an axis and is provided on a sun gear that rotates about the axis and a tip of the oscillating arm, and meshes with the sun gear. And a rewinding gear that transmits a driving force to a rewinding mechanism and a rewinding mechanism that meshes with a spool shaft gear at the oscillating position of the oscillating arm. It is adapted to mesh with teeth selectively. 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 switching 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 rewinding gear is swung in the direction of the gear and the switching gear meshes with the hoisting gear. The switching gear meshes with the drive gear to drive the rewinding mechanism to rewind the film.

[0003]

In the conventional camera film winding mechanism, as described above, since the reduction gear device connected to the motor shaft gear is formed in the planetary gear device, it has a large size and a complicated structure. However, there is a problem that the cost becomes high. In the reduction gear device, in order to obtain a large reduction ratio with the smallest possible number of parts, it is necessary to take a large reduction ratio per gear stage. To this end, it is necessary to reduce the number of teeth of the gear on the driving shaft side (motor shaft gear) as much as possible. However, in the prior art, the motor shaft gear 1 is formed as a pinion gear as shown in FIG. 4, and the pinion gear is pushed into and fixed to the rotary shaft 3 of the motor 2. It is necessary to make the diameter larger than 3, and there is a limit in reducing the diameter. Therefore, the size of the pitch circle diameter of the motor shaft gear 1 is also limited, the number of teeth is increased in relation to the module, and there is a problem that the first reduction gear ratio cannot be made large.

Therefore, 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 which can be formed in a small size and which can reduce the cost.

[0005]

The present invention has the following constitution in order to achieve the above object. That is, a spool shaft that is rotatably supported in the camera body, a drive motor that is supported by positioning the body in the spool shaft, a motor shaft gear attached to the rotation shaft of the drive motor, and the motor. The reduction gear device connected to the shaft gear, the sun gear that rotates about the shaft on the swing arm that is swingably provided about the shaft, and the sun gear that meshes with the sun gear on the tip of the swing arm. Having a switching gear, wherein the sun gear comprises an oscillating gear device that meshes with an external transmission gear of the reduction gear device, wherein the switching gear of the oscillating gear device is in an oscillating position of an oscillating arm,
In a camera film winding mechanism that selectively meshes with a hoisting gear that meshes with a spool shaft gear and a rewinding gear that transmits a driving force to a rewinding mechanism, the spool shaft has a bottomed cylindrical shape provided in a head case. The support part is rotatably supported on the support part by being fitted therein, and the main body of the drive motor is screwed to the bottom surface of the support part and positioned in the spool shaft,
The rotation shaft of the drive motor extends through the through hole provided in the bottom surface of the support portion and extends into the support portion, and the motor shaft gear is fitted to the rotation shaft in the support portion, and the reduction gear device has a plurality of gears. A group of spur gears are arranged and meshed in a plane and are arranged in the support portion, the oscillating gear device is arranged in the head case, and an external transmission gear of the reduction gear device and / or the The sun gear of the oscillating gear device is arranged so as to straddle the spool shaft end edge, and the external transmission gear and the sun gear mesh with each other. The motor shaft gear has a boss portion that fits into the rotation shaft of the motor, a shaft portion that is provided on the boss portion coaxially with the rotation shaft of the motor, and has a bottom tooth circle on the shaft portion that is smaller in diameter than the motor output shaft. It is preferable that the tooth portion is formed so as to have the above shape, and the tip of the shaft portion of the motor shaft gear is supported by the head case. Further, it is preferable that the shaft of the sun gear or the shaft of the switching gear of the oscillating gear device is formed into a bifurcated shape so as to elastically contact with the shaft hole of the sun gear or the shaft hole of the switching gear to give a predetermined frictional force. is there.

[0006]

According to the present invention, as described above, the support portion is formed in a cylindrical shape with a bottom and is fitted into the spool shaft, and the reduction gear device constituted by the spur gear group is housed in the support portion, and Since the driving force is transmitted to the external transmission gear consisting of spur gears or only the plate portion of the sun gear is arranged so as to straddle the spool edge, it is possible to reduce the substantial thickness of these reduction gear groups. Therefore, the device can be downsized. Also, since the tooth bottom of the motor shaft gear is set so that its root is smaller in diameter than the rotation shaft of the motor, the number of teeth in the tooth is reduced,
For example, in the past it was possible to set only about 8-9,
In the present invention, it can be set to about 5 to 7, and the reduction ratio can be increased. Further, since the motor shaft gear is supported at both ends, shaft runout is small and frictional resistance is small, so efficient transmission can be performed. By forming the shaft of the switching gear or the sun gear into a bifurcated shape and applying a frictional force due to its elasticity, an oscillating gear device serving as a clutch mechanism can be easily constructed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below in detail 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 shaft, and a spool gear 11 is formed on the outer periphery of one end of the spool shaft, and is rotatably supported on a bottomed cylindrical support portion 13 of a head case 12. Although not shown, a feed claw that fits into the feed hole of the film is provided in the middle of the spool shaft 10. Reference numeral 14 is 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 shaft 10. The rotary shaft 16 of the motor penetrates through a through hole provided at the bottom of the support 13 and projects into the support 13, and the tip of the rotary shaft 16 has a D-shaped cross section. 16 is a motor shaft gear,
Integrally formed of synthetic resin, the boss portion 18, the shaft portion 19,
It is composed of teeth 20. The motor shaft gear 17 is fitted to the rotary shaft 16 with a predetermined clearance at the boss portion 18 and rotates together with the rotary shaft 16. Further, the motor shaft gear 17 is supported by the lid of the head case 12 at the tip of the shaft portion 19 so as to be supported on both sides and the shaft runout is prevented. Tooth portion 20 formed on the outer periphery of the shaft portion 19
Is set so that its root has a diameter smaller than that of the rotary shaft 17.

Reference numeral 22 is a reduction gear meshed with the motor shaft gear 17, 23 is an intermediate gear meshed with the reduction gear 22, 24 is a reduction gear meshed with the intermediate gear 23, and 25 is this reduction gear 2
4 is an intermediate gear meshing with 4. The intermediate gear 25 is set such that its plate-shaped gear body straddles the end edge portion of the spool shaft 10 and a part of its tooth portion projects outside the spool shaft 10. Reduction gear 22, intermediate gear 23, reduction gear 2
4 is basically arranged in the bottomed cylindrical support portion 13, and since the support portion 13 is fitted in the spool shaft 10, these gear groups project outward from the end edge of the spool shaft 13. There are few parts. That is, a part of the head case 12 accommodating the gear group is fitted into the spool shaft 10, and the total length of the head case 12 and the spool 10 is shortened. Further, the intermediate gear 25 is also basically within the range of the spool shaft 10, and only the thin plate-like portion thereof straddles the end edge of the spool shaft and a part of the tooth portion protrudes to the outside. Case 1
It can be stored in 2. All the above gear groups are made of synthetic resin. The reduction gear 22 and the intermediate gear 2
3, the reduction gear 24, and the intermediate gear 25 constitute a reduction gear device 26, and the intermediate gear 25 constitutes an external transmission gear for transmitting the driving force to the outside.

Reference numeral 27 is an oscillating gear device provided in the head case 12. Reference numeral 28 denotes a swing arm, which is located near the outside of the spool shaft 10 and is swingable about a shaft 29 provided in the head case 12. A sun gear 30 is rotatably provided on the swing arm 28 about a shaft 29 and meshes with the intermediate gear 25. Reference numeral 31 denotes a switching gear rotatably provided on the swing arm 28 about a shaft 32 provided on the tip end of the swing arm 28, and meshes with the sun gear 30. The shaft 32 is shown in FIG.
As is clear from the above, the shaft 32 is elastically fitted into the shaft hole of the switching gear, so that the switching gear 31 rotates with a predetermined frictional resistance with respect to the shaft 32. The shaft 29 of the sun gear 30 may be formed in a bifurcated shape so that a predetermined friction torque is applied to the sun gear 30. A hoisting gear 34 meshes with the spool gear 11 of the spool shaft 10, and when the swinging arm 28 swings in the hoisting gear 34 direction, the switching gear 31 causes the hoisting gear 34 to rotate.
Mesh with. 35 is a hoisting gear 34 with the switching gear 31 sandwiched therebetween.
Is a rewinding gear provided on the opposite side to the swing arm 28.
The switching gear 31 meshes with each other when it swings in that direction. The oscillating gear device 27, the hoisting gear 34, the rewinding gear 35, etc. are also made of synthetic resin.

With the above construction, when the drive motor 14 rotates in the normal direction, the intermediate gear 25 rotates in a predetermined direction via the motor shaft gear 17, the reduction gear 22, the intermediate gear 23, and the reduction gear 24. The sun gear 30
However, since the sun gear 30 is meshed with the switching gear 31 that requires a predetermined rotation torque, a predetermined rotation torque is required for the rotation of the sun gear 30. Is swung, the switching gear 31 meshes with the hoisting gear 34, and the spool shaft 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 switching 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 support portion 13 is formed into a cylindrical shape having a bottom and is fitted into the spool shaft 10. The reduction gear device constituted by the spur gear group is accommodated in the support portion 13 and is externally mounted. Transmission of the driving force of the intermediate gear 2 consisting of spur gears
Since only the plate-shaped portion of No. 5 is arranged so as to straddle the spool edge, the substantial thickness of these reduction gear groups can be reduced, and the device can be downsized. Further, as mentioned above, the tooth portion 20 of the motor shaft gear 17 is set so that its tooth bottom has a diameter smaller than that of the rotating shaft 16. Moreover, by setting the diameter of the shaft portion 19 in the tooth portion 20 to be small, the tooth bottom diameter can be freely set to be small. Therefore, the number of teeth of the tooth portion 20 is small, for example, it was possible to set only about 8 to 9 in the related art, but it can be set to about 5 to 7 in the present embodiment, and the reduction ratio can be increased. Also, motor shaft gear 1
7, the reduction gears 22 and 24, and the intermediate gears 23 and 25 are independently supported at both ends by the head case, so that shaft runout is small and frictional resistance is small, so that efficient transmission can be performed. By forming the shaft 32 or 29 of the switching gear 31 or the sun gear 30 into a bifurcated shape and imparting a frictional force by its elasticity, an oscillating gear device as a clutch mechanism can be easily constructed. Since the switching gear 31 or the sun gear 30 need only be press-fitted into the shaft 32 or the shaft 29, their assembly can be easily performed. In the above embodiment, the plate-shaped portion of the intermediate gear 25 straddles the end edge of the spool shaft 10.
You may make it the plate-shaped part of 0 straddle the spool shaft edge.

[0012]

According to the present invention, as described above, the support portion is formed into a cylindrical shape with a bottom and is fitted into the spool shaft, and the reduction gear device constituted by the spur gear group is housed in the support portion. For the transmission of driving force to the outside, only the plate-shaped portion of the external transmission gear or the sun gear consisting of spur gears is arranged so as to straddle the spool edge, so that the substantial thickness of these reduction gear groups is reduced. Therefore, the device can be downsized. Further, since the tooth portion of the motor shaft gear is set so that its root has a diameter smaller than that of the rotating shaft of the motor, the number of teeth of the tooth portion is small, and for example, in the past, only about 8 to 9 could be set. However, in the present invention, it can be set to about 5 to 7, and the reduction ratio can be increased. Further, since the motor shaft gear is supported at both ends, shaft runout is small and frictional resistance is small, so efficient transmission can be performed. By forming the shaft of the switching gear or the sun gear into a bifurcated shape and applying a frictional force due to its elasticity, an oscillating gear device serving as a clutch mechanism can be easily constructed.

[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.

FIG. 3 is a sectional view showing a fixing structure of a motor.

FIG. 4 is an explanatory view showing a conventional fixing structure for a motor shaft gear.

[Explanation of symbols]

 10 spool shaft 12 head case 13 support portion 14 drive motor 16 rotating shaft 18 boss portion 19 shaft portion 20 tooth portion 25 intermediate gear (external transmission gear) 26 reduction gear device 27 swing gear device 29, 32 shaft 30 sun gear 31 switching Gear 34 Winding gear 35 Rewinding gear

Claims (3)

[Claims] 1. A spool shaft rotatably supported in a camera body, a drive motor having the body positioned and supported in the spool shaft, and a motor shaft gear attached to the rotary shaft of the drive motor. A reduction gear device connected to the motor shaft gear, a sun gear that rotates about the shaft on a swing arm that is swingably provided about the shaft, and a sun gear on the tip of the swing arm A switching gear that meshes with the sun gear and an oscillating gear device that meshes with an external transmission gear of the reduction gear device, wherein the switching gear of the oscillating gear device oscillates an oscillating arm. At a position, in a hoisting gear that meshes with a spool shaft gear and a rewinding gear that selectively engages a rewinding gear that transmits a driving force to a rewinding mechanism, the spool film is provided in a head case. The bottom cylindrical support can be inserted. Is rotatably supported on the support portion, and the main body of the drive motor is screwed to the bottom surface of the support portion and positioned in the spool shaft. The rotation shaft of the drive motor is a through hole provided on the bottom surface of the support portion. The motor shaft gear is fitted to the rotary shaft in the support portion, and the reduction gear device is configured by a plurality of spur gear groups arranged in a plane and meshed with each other. The oscillating gear device is arranged in a supporting portion, the oscillating gear device is arranged in the head case, and the external transmission gear of the reduction gear device and / or the sun gear of the oscillating gear device is arranged so as to straddle a spool shaft edge. The film winding mechanism for a camera film, wherein the external transmission gear and the sun gear mesh with each other. 2. The motor shaft gear includes a boss portion fitted to a rotation shaft of the motor, a shaft portion provided on the boss portion coaxially with the rotation shaft of the motor, and a bottom tooth circle on the shaft portion of the motor shaft gear. The camera film winding according to claim 1, further comprising a tooth portion provided so as to have a diameter smaller than that of the output shaft, and a tip of the shaft portion of the motor shaft gear is supported by the head case. mechanism. 3. The shaft of the sun gear or the shaft of the switching gear of the oscillating gear device is formed into a bifurcated shape and elastically contacts the shaft hole of the sun gear or the shaft hole of the switching gear to impart a predetermined frictional force. The camera film winding mechanism according to claim 1 or 2, characterized in that: