JP2837320B2 - Oscillating gear device and camera film winding mechanism incorporating the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oscillating gear device and a camera film winding mechanism incorporating the oscillating gear device.

[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 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 motor gear, and a sun gear of an oscillating gear device constituting a clutch mechanism meshes with an 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 oscillating gear that rotates, and the oscillating gear of the oscillating gear device selectively meshes with a spool gear and a rewind gear that transmits a driving force to the rewind mechanism at an oscillating position of the oscillating arm. It 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 swing gear is configured to require a predetermined torque. Swinging in the gear direction, the oscillating gear meshes with the spool gear to wind up the film, and when the drive motor is rotated in the opposite direction, the oscillating arm oscillates in the opposite direction to form a rewind gear. The oscillating gears mesh with each other to drive the rewind mechanism to rewind the film.

[0003]

In the above-mentioned rocking gear device, the rocking arm is cantilevered by a shaft, and the rocking gear is supported on the tip side of the rocking arm that is off the shaft. Therefore, the weight balance around the axis is poor, and the swing arm is inclined, which adversely affects the meshing of the swing gear with the hoisting gear and the spool gear, and when the swing arm swings. In addition, there is a problem that the swing gear strongly collides with the rewind gear or the spool gear due to the inertial force, and the meshing is easily disengaged by the reaction.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide an oscillating gear device having a good weight balance and capable of smooth oscillating, and incorporating the oscillating gear device. A camera film winding mechanism is provided.

[0005]

The present invention has the following arrangement to achieve the above object. That is, the swing according to the present invention is
In the dynamic gear device, it can swing around the rotation shaft 29,
Attached to the rotating shaft 29 with a predetermined frictional force in the middle
Swing arm 28 fixed to the rotating shaft 29
A sun gear 23 and the sun teeth with the swing arm 28 interposed therebetween;
It is located on the opposite side to the wheel 23 and is fixed to the rotating shaft 29,
A gear 30 to which forward and reverse rotational force is transmitted from the outside;
Meshing with the positive gear 23 and on one end of the swing arm 28
Rotates with required frictional resistance to the swing arm 28
At both ends of the swing path of the swing arm 28.
The two switching gears provided in the
Is transmitted to the gear 30 and the swinging arm
When the gear 28 swings in the positive direction, the switching gear
Meshes with one of the switching gears, in the opposite direction from the outside
Is transmitted to the gear 30 and the swing arm 28
Swings in the opposite direction, so that
A swing gear 31 meshing with the other switching gear;
The other end of the arm 28 faces the peripheral surface of the sun gear 23.
A sliding plate 36 erected so as to extend.
The plate 36 comes into contact with an arcuate guide provided outside and
It is characterized in that the swing of the swing arm 28 is guided.
I have. In the camera film winding mechanism according to the present invention,
The cylindrical support part 13 with a bottom of the reduction gear support 12 is fitted.
The spoon rotatably supported on the support portion 13 by
And the spool fixed to the bottom of the support portion 13.
The rotary shaft 16 is located in the support
The positive electrode extending into the support portion 13 through the provided through hole
A reverse drive motor 14 and a motor fitted to the rotary shaft 16
Gear 17 and the reduction gear support 12 so as to be rotatable.
Supported, and drive force is transmitted from the motor gear 17
It is provided with a reduction gear device and a swingable
Swing arm 28 fixed to the rotating shaft 29 and rotated.
Sun gear 23 and one end of the swing arm 28.
A swing gear 31 meshed with the sun gear 23
Then, a rotational force is applied to the sun gear 23 from the reduction gear device.
And a oscillating gear device 27 to be transmitted.
The oscillating gear 31 of the device 27 is adapted to oscillate the oscillating arm 28.
Driving force on spool gear or spool gear in moving position
Gear to transmit the driving force and rewind to transmit the driving force to the rewind mechanism
The camera film winding mechanism selectively meshes with gears.
And the oscillating gear device 27 has the rotation shaft 29 as a center.
As a predetermined friction on the rotating shaft 29 in the middle part.
Said swing arm 28 attached with force;
The sun gear 23 fixed to a rotating shaft 29;
Located on the opposite side of the sun gear 23 with respect to the arm 28
Fixed to the rotating shaft 29,
The gear 30 to which the reverse rotational force is transmitted, and the sun gear 23
The swing arm is engaged with one end of the swing arm 28.
28 is provided rotatably with the required frictional resistance.
Swinging gear 31 and the other end of the swinging arm 28
The sun gear 23 is provided so as to extend facing the peripheral surface of the sun gear 23.
And a sliding plate 36 provided with the camera body.
Swinging arm 2 in contact with an arc-shaped guide
8 is guided.

[0006]

The oscillating gear device according to the present invention and the camera
According to the LUM hoisting mechanism, the sun gear
The other end of the swing arm on the opposite side is
There is a sliding plate set up to extend in the direction
When the robot swings, the sliding plate is guided by the arc guide.
This prevents shaft runout and prevents shaft
The weight of the swing arm against
Cantilever support prevents tilting of the swing arm.
The oscillating teeth are reduced because the inertial force during oscillating is reduced accordingly.
Mesh for switching gears such as rewind gear and spool gear of a car
The case is made smoothly.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments 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 denotes a cylindrical spool having a spool gear 11 formed on the outer periphery of one end thereof, and supported on a cylindrical support 13 having a bottom of a reduction gear support 12 so as to be rotatable about an axis. Although not shown in the middle of the spool 10,
A feed claw that fits into the feed hole of the film is provided.
Reference numeral 14 denotes a drive motor, and the support portion 13 is
And the body is located within the spool 10.
The rotating shaft 16 of the motor projects through the through hole provided at the bottom of the supporting portion 13 and projects into the supporting portion 13.
Is formed in a D-shaped cross section. Reference numeral 17 denotes a motor gear, which is integrally formed of a synthetic resin,
It comprises a shaft portion 19 and a tooth portion 20. The motor gear 17 is fitted to the rotating shaft 16 with a predetermined clearance at the boss 18 and rotates with the rotating shaft 16. Further, the motor gear 17 is supported at both ends by being supported by a head case 21 serving as a lid at a tip portion of the shaft portion 19,
Shaft runout is prevented. The tooth portion 20 formed on the outer periphery of the shaft portion 19 is set such that the tooth bottom is smaller in diameter than the rotating shaft 17. The number of teeth of the motor gear 17 is formed as a small number of 5-7. The reduction gear support 12 is fixed together with the head case 21 to the camera body 26 by screws 39 as shown in FIG.

Reference numeral 22 denotes a 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 two-stage of a large-diameter gear 24a and a small-diameter gear 24b meshing with the gear 22b. And 25 are external transmission gears that mesh 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 in the bottomed cylindrical support portion 13. These reduction spur gears 22 and 24 and the external transmission gear 25 are all formed of reinforced synthetic resin. And the small gear 22b of the reduction spur gears 22, 24,
The number of teeth of 24b is set to a small number of 6 to 7 in all cases.

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. 28 is its swing arm journalled been times located near the outside of the spool 10 in the head case 21 and the camera body 26
It is attached to a turning shaft (hereinafter sometimes simply referred to as a shaft) 29 with a predetermined frictional force, and is provided to be swingable about the shaft 29. Reference numeral 30 denotes a driven gear (gear), which is fitted on the shaft 29 and meshes with the external transmission gear 25. Reference numeral 23 denotes a sun gear formed on the outer periphery of a shaft 29 opposite to the driven gear 30 with the swing arm 28 interposed therebetween. Reference numeral 36 denotes a sliding plate provided at an end of the swing arm 28, which is guided by being brought into contact with an arc-shaped guide 37 provided upright on the camera body 26, thereby preventing the shaft 29 from swinging. Reference numeral 31 denotes a swing gear provided on the swing arm 28 so as to be rotatable about a shaft 32 provided on the tip of the swing arm 28,
It is in mesh with the sun gear 23. The oscillating gear 31 is the disc spring 3
3 is pressed onto the swing arm 28, and the swing arm 28
With a predetermined frictional resistance. Swing gear 3
Scan time 1 the swinging arm 28 swings in the spool 10 direction
It meshes with the pool shaft (one switching gear ) 11 (FIG. 3).
Further, when the swing gear 31 is swung in the opposite direction of the spool 10, it meshes with a rewind gear (the other switching gear) 35. The swing gear 31 may mesh with the spool shaft 11 via an appropriate hoisting gear (not shown). The oscillating gear device 27, the rewind gear 35, and the like are also formed of synthetic resin.

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 23 is rotated via the driven gear 30. Since the sun gear 23 is meshed with the oscillating gear 31 requiring a predetermined rotation torque, the rotation of the sun gear 23 also has the predetermined rotation torque. Since the swing arm 28 swings due to the resistance, the swing 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 rotates in the opposite direction, the swing arm 28 swings in the opposite direction, the swing gear 31 rotates the rewind gear 35, and the film is rewound into the cartridge by a known mechanism. It is. When the swing arm 28 swings, the swing arm 31 is on the opposite side to the swing gear 31 with respect to the shaft 29.
The end of the arm 28 is extended to face the peripheral surface of the sun gear 23.
Building so erected the sliding plate 36 is present, the sliding plate 3
6 is guided by the arcuate guide 37, the shaft 29 is prevented from oscillating as described above, and
Of the swing arm 28 can be prevented by the cantilever support by the shaft 29, and the inertia force at the time of swing is reduced accordingly. Gear 35 and spool gear 1
1 is smoothly engaged.

As described above, the support portion 13 is formed in a cylindrical shape with a bottom and fitted into the spool 10, and the reduction gear device constituted by a group of spur gears is housed in the support portion 13, and is provided to the outside. Since only the plate-like portion of the external transmission gear 25 made of a spur gear is arranged so as to straddle the end of the spool for transmitting the driving force, the substantial thickness of these reduction gear groups can be reduced, and The size can be reduced. Further, as described above, the tooth portion 20 of the motor gear 17 is set so that its tooth bottom is smaller in diameter than the rotating shaft 16. In addition, by setting the diameter of the shaft portion 19 of 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 can be set only to about 8 to 9 in the past, but in the present embodiment, it can be set to about 5 to 7, and the reduction ratio can be increased. In the present invention, the number of teeth of the small gears 22b and 24b of the reduction spur gears 22 and 24 is set to a small number of 6 to 7 teeth. In a small-diameter gear, it is extremely difficult to reduce the number of teeth. Generally, the pressure-resistant tooth strength P is represented by P = σmbY. is the material stress, m is the module, b is the tooth thickness, and Y is the tooth form factor.
In the case of metal, since the material stress σ is large, the module m
, The pitch circle is small, and the number of teeth is large. That is, a small-diameter gear can be made. However, when the material is a synthetic resin, the material stress σ is small, so that in order to secure the required pressure-resistant tooth strength to a required size, the module must inevitably be enlarged, and thus the pitch circle becomes large and the large diameter becomes large. I could only make gears. As described above, in the case of such a large-diameter gear, it is against the demand for downsizing the camera. On the other hand, in order to keep the pitch circle small and enlarge the module, it is conceivable to reduce the number of teeth. However, in the case of an involute tooth profile, an undercut portion occurs when the number of teeth is 13 or less, particularly in the case of metal. The number of teeth is limited to eight for the convenience of cutting. If the material is a synthetic resin, molding is possible even if an undercut occurs, but as shown in FIG. 4, the root of the tooth is largely undercut, so that the synthetic resin has an extremely low tooth strength. Worse and cannot be hired. For an involute tooth profile, the undercut of the tooth profile is the tooth factor Y, and thus the module m and the transfer factor X
Related to The inventor has conceived that by increasing the transfer coefficient X, the undercut shape of the tooth profile can be eliminated even when the number of teeth is reduced. That is,
Even if the number of teeth was 6 to 7, the undercut of the tooth profile was almost eliminated, and the required tooth strength could be obtained. Table 1 shows data of each gear of the embodiment shown in the figure.

[0012]

[Table 1]

As is apparent from Table 1, the small gears 22b,
The transfer coefficients of 24b are set to 0.599 and 0.693, respectively. The conventional ordinary transfer coefficient is about 0.5.
When the transfer coefficient is increased in the involute tooth profile, the so-called meshing pressure angle increases, and the bearing loss increases. In the above-described embodiment, the transfer coefficient is set as large as possible within a range that does not adversely affect the shaft, so that the necessary tooth strength is ensured by preventing the occurrence of undercut in the tooth profile. And this gives
Even if the pitch circle is set relatively small and the gear diameter is small,
The module can be enlarged, and the required tooth strength can be increased. Further, the reduction spur gears 22 and 24 have a small diameter and can be disposed in the cylindrical support having a bottom, so that the reduction mechanism can be downsized. In the above embodiment, the plate-like portion of the external transmission gear 25 is set to straddle the edge of the spool 10.
The zero plate-shaped portion may straddle the spool edge. Further, in the above embodiment, the sun gear 23 and the driven gear 30
Are provided separately, but they may be integrated into one. The oscillating gear can be used not only for the film winding mechanism but also for general purposes.

[0014]

As described above, the oscillating gear device according to the present invention is provided.
According to the mounting and camera film winding mechanism, the sun gear
The other end of the swing arm opposite to the swing gear across
The slider is set up so as to extend facing the peripheral surface of the sun gear.
When the swing arm swings when a moving plate exists, this sliding plate
Guided by the arc guide, shaft runout is prevented.
Is stopped and the weight bar of the swing arm
The lance is removed, and the swing arm is
Tilt can be prevented, and the inertial force when swinging is that much
Because it is reduced, rewind gear of oscillating gear, spool gear, etc.
Is smoothly engaged with the switching gear.

[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.

FIG. 4 is an explanatory diagram of a tooth undercut shape.

[Explanation of symbols]

10 spool 12 reduction gear support 13 supports 14 the drive motor 16 rotates shaft 18 boss 19 shaft portion 20 teeth 22 reduction spur gear 23 sun gear 25 outside the transmission gear 27 swinging gear device 29, 32 the shaft 31 swings Gear 35 Rewind gear

Claims (2)

(57) [Claims] 1. A center swingable about a rotation shaft.
At a certain point, it is attached to the rotating shaft 29 with a predetermined frictional force.
Swing arm 28, sun gear 23 fixed to the rotating shaft 29, and the opposite side of the sun gear 23 across the swing arm 28.
Positioned and fixed to the rotating shaft 29, and forward / reverse rotation from outside
A gear 30 to which a rolling force is transmitted , and one end of the swing arm 28 meshing with the sun gear 23
The required frictional resistance against the swing arm 28 is
The swing arm 28 is provided so as to be rotatable.
For the two switching gears provided at both ends, the external gear
The rotational force in the positive direction is transmitted to the gear 30 from the
The switching is performed when the moving arm 28 swings in the positive direction.
Mesh with one of the gears, and
Is transmitted to the gear 30 and the swinging arm
When the gear 28 swings in the opposite direction, the switching gear
A swing gear 31 meshing with the other switching gear, and the other end of the swing arm 28
A sliding plate 36 erected so as to extend opposite the surface.
The sliding plate 36 comes into contact with an externally provided arcuate guide.
The swing of the swing arm 28 is guided.
Oscillating gear device. 2. A cylindrical support having a bottom for a reduction gear support 12.
When the portion 13 is fitted, it is rotatably supported on the support portion 13.
Held on the spool 10 and the bottom surface of the support portion 13.
And the rotating shaft 16 is positioned within the spool 10.
Penetrating through holes provided on the bottom surface of the holding portion 13 and
The forward / reverse drive motor 14 extended to the
The fitted motor gear 17 and the reduction gear support 12
Is rotatably supported above and is driven by the motor gear 17
A reduction gear device to which the force is transmitted and a swing around the rotation shaft 29
A swing arm 28 movably provided and fixed to the rotation shaft 29.
Fixed and rotating sun gear 23 and swing arm 28
Is provided on one end of the sun gear and meshes with the sun gear 23.
A driving gear 31;
And an oscillating gear device 27 for transmitting torque to the motor 23
And, the swing gear 31 of the swing gear equipment 27, the rocking
In the swing position of the moving arm 28, the spool gear or
Driven by the hoisting gear and rewind mechanism that transmit the driving force to the
A camera filter that selectively meshes with a rewind gear that transmits force
In the LUM hoisting mechanism, the oscillating gear device 27 is oscillated about the rotation shaft 29 so that
The swing attached to the rotating shaft 29 with a predetermined frictional force.
A moving arm 28, the sun gear 23 fixed to the rotating shaft 29, and a side opposite to the sun gear 23 across the swing arm 28.
The reduction gear device is positioned and fixed to the rotation shaft 29.
A gear 30 to which forward and reverse rotational force is transmitted , and one end of the swing arm 28 meshing with the sun gear 23
The required frictional resistance against the swing arm 28 is
Around the sun gear 23 at the other end of the swing arm 28 and the swing gear 31 rotatably provided.
A sliding plate 36 erected so as to extend opposite the surface.
The sliding plate 36 is an arc-shaped guide erected on the camera body.
That the swing of the swing arm 28 is guided by
Characteristic camera film winding mechanism.