JP2780948B2 - Oscillating gear device and camera film winding mechanism using 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 for easily assembling a friction material and a camera film winding mechanism using the same.

[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 in the spool, and a motor gear is mounted on a rotation shaft of the drive motor. A reduction gear device is connected to the motor gear, and an external transmission gear of the reduction gear device meshes with a sun gear of an oscillating gear device constituting a clutch mechanism. This oscillating gear device is configured such that a sun gear that rotates about the rotation axis is provided on a swing arm that is provided so as to be capable of swinging about the rotation axis, and the sun gear meshes with the sun gear on the tip end of the rotation arm. A oscillating gear that rotates about a shaft; and a friction material that imparts a required frictional force to the sun gear or the oscillating gear. In this position, the gear is selectively engaged with a spool gear (or a spool gear via an intermediate gear) and a rewind gear that transmits a driving force to the rewind mechanism.

When the driving motor rotates forward, the driving force is transmitted to the sun gear via the external transmission gear, and a frictional force is applied to the sun gear or the oscillating gear by a friction material. When the drive motor rotates in the opposite direction, the swing arm swings in the opposite direction and swings to the rewind gear. The dynamic gears mesh with each other to drive the rewind mechanism to rewind the film.

In the above-mentioned oscillating gear device, the oscillating arm, the sun gear, the oscillating gear, the rotating shaft of the oscillating gear, and the like are formed of synthetic resin in order to reduce costs. FIG. 5 shows an example of a conventional oscillating gear device 110. Reference numeral 111 denotes a swing arm, which can swing about a rotation shaft 112. 113 is a sun gear and a rotating shaft 112
Rotate around. Reference numeral 114 denotes an oscillating gear, and the sun gear 11
3 and rotates about the rotation shaft 115. Reference numeral 116 denotes a disc spring serving as a friction material.
It is disposed between the head and the head and applies a frictional force to the swing gear 114. Reference numeral 118 denotes an external transmission gear (gear on the driving side) of the reduction gear device, which transmits a rotational force to the sun gear 113. 119
Is a rewind gear, 120 is a spool, and the swing arm 11
By the swing of 1, the swing gear 114 meshes with the rewind gear 119 to rewind the film, or meshes with the spool gear 121 via an unshown intermediate gear (winding gear) to unwind the film.

Reference numeral 122 denotes a stopper, and the swing arm 11
1, projecting into the window 124 provided in the cover 123, the swing arm 111 swings and the stopper 122
Abuts against the inner walls (per degree) at both ends of the window 124 so that the swing gear 114 meshes with the spool gear 121 via the rewind gear 119 or the intermediate gear at a predetermined position. 6 and 7 show the disc spring 116. FIG. As shown, the disc spring 116 punches a spring material into a ring to form a ring member 116a.
As shown in FIG. 7, 6a is bent so as to form a shallow circular arc shape on the side so as to provide a spring property.

[0006] The above-mentioned conventional rocking gear device 110 has the following problems. That is, the stopper 1
22 contacts the inner walls (per degree) of both ends of the window 124,
A predetermined backlash is generated between the oscillating gear 114, the rewind gear 119, and the intermediate gear so as to obtain smooth rotation of the gear. However, when the oscillating gear 114 rotates the spool gear 121 through the intermediate gear to wind up the film, the last end of the film is fixed to the patrone shaft of the patrone. The film is stretched and the motor is stopped, but the torque at that time becomes maximum, and the maximum load is applied to the gear teeth and other mechanical parts. The maximum load is also applied to the swing arm 111, and even if the stopper 122 abuts against each other, deformation such as twisting occurs in the swing arm 111, particularly when the swing arm 111 is made of synthetic resin. ,
As a result, the teeth of the oscillating gear 119 are strongly engaged with the teeth of the spool gear 121 or the intermediate gear and bite. Even if the motor is rotated in the reverse direction for the next rewinding, the biting between the gear teeth is eliminated. However, there was a possibility that a situation in which the film could not be rewound would occur.

Further, since the disc spring 116 is fixed by using the screw 117, there are problems that the number of parts is large, the cost is high, and the assembling is difficult.

Accordingly, the present invention has been made to solve the above problems, and an object thereof is to provide a friction material.
It is an object of the present invention to provide an oscillating gear device that can easily assemble and reduce costs and a camera film winding mechanism using the oscillating gear device.

[0009]

The present invention has the following arrangement to achieve the above object. That is, a sun gear that rotates about the axis on a swing arm that is swingably provided about the rotation axis and a sun gear meshes with the sun gear on the tip of the swing arm and rotates about the rotation axis. It has an oscillating gear, and further has a sun gear or a friction material for imparting frictional force to the oscillating gear, and when a rotational force is applied by a driving gear that meshes with the sun gear, the friction material In the swing gear device provided so that the swing gear meshes with the driven gear arranged in the swing direction, the friction material is formed by a spring material. Re
Ring-shaped ring member has a shallow circular arc shape
And the rotation shaft of the oscillating gear in the center hole.
Is a friction material that is inserted and fixed on the rotating shaft,
Multiple notches are formed in the radial direction from the inner end of the central hole.
The tips of the plurality of claw pieces formed by the
It is characterized by being in elastic contact with the rotating shaft of the dynamic gear.

The rotating shaft is made of a synthetic resin, and the rotating shaft is
The friction material is removed from the rotating shaft by heat staking.
It is preferable to stop. Further, the friction material is washed with a washer.
It is preferable to prevent the rotary shaft from coming off from the rotary shaft. The central hole is preferably formed in a flat spring material into an almost elliptical shape, and when the ring member is bent so as to have a shallow circular arc shape on the side, the ring member is preferably formed into an elliptical shape that is almost circular in plan view. It is. It is preferable that, of the claw tips, the claw tip located on the bent portion of the ring member elastically contacts the rotation shaft of the swing gear.

Further, according to the present invention, a spool rotatably supported in a camera body, a drive motor positioned and supported in the spool, a motor gear mounted on a rotation shaft of the drive motor, and A reduction gear device connected to the motor gear, a sun gear that rotates about the rotation axis on a swing arm that is swingably provided about the rotation axis, and a sun gear on the tip of the swing arm. An oscillating gear that meshes and rotates about a rotation shaft, and further includes a sun gear or a friction material for applying frictional force to the oscillating gear, wherein the sun gear is an external transmission gear of the reduction gear device. The swing gear of the swing gear device is provided with a swing gear that meshes with the swing gear, and a swing gear and a rewind mechanism that transmit driving force to the spool gear or the spool gear at the swing position of the swing arm. Winding that transmits driving force In a camera film winding mechanism that selectively meshes with a gear, the above-described oscillating gear device is used for the oscillating gear device, the main driving gear is the external transmission gear, and the driven gear is the spool gear or It is a hoisting gear for transmitting a driving force to a spool gear and a rewinding gear for transmitting a driving force to a rewinding mechanism.

[0012]

Operation The operation according to FIG. 1 will be described. Stoppers 34, 3
2a are provided on the front and back sides of the swing arm 28 and are supported from the front and back sides when abutting against each other, so that the swing arm 28 is not deformed even when a large load is applied at the time of the last winding of the film. Therefore, it is possible to avoid a phenomenon in which the swing gear bites into the teeth of the intermediate gear or the spool gear as in the related art, and has an effect that the switching operation of the swing gear can be performed smoothly. By bending the ring member 33a shown in FIG. 2, the tip of the claw piece 33d on the short axis direction side of the center hole 33b tends to slightly open outward, while the tip of the claw piece 33d on the long axis direction side tends to open. Tend to close slightly inward. Although not shown in the figure, an ellipse in the case of a flat plate becomes a central hole which is almost circular in plan view. The rotating shaft 32 is inserted into the central hole 33b of the friction material 33 formed as described above. Since the center hole 33b has a substantially circular shape, the rotation shaft 32 can be easily inserted. To fix the friction material 33 on the rotating shaft 32, the synthetic resin rotating shaft 32 is heated and heat caulked as shown in FIG. 1 while pressing the friction material 33 against the surface of the swing gear 31. Can be easily done. Therefore, assembly becomes easy.

[0013]

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 sectional view of the film winding mechanism. In the figure, a cylindrical spool 10 has a spool gear 11 formed on the outer periphery of one end thereof and is 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. A drive motor 14 is fixed to the bottom of the reduction gear support 12 by screws (not shown), and the main body is located in the spool 10. The rotating shaft 16 of the motor 14 projects through the through hole provided in the bottom of the reduction gear support 12 and projects into the reduction gear support 12, and the tip of the rotation shaft 16 has a D-shaped cross section. .

Reference numeral 17 denotes a motor gear, which is integrally formed of a synthetic resin, is fitted on the rotating shaft 16 and rotates together 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 distal end portion of the shaft portion 19, thereby preventing shaft runout. The reduction gear support 12 is fixed to the head case 21 by a screw 20.
It is fixed to. Reference numerals 22, 23, and 24 denote reduction spur gears, which are arranged on the reduction gear support 12. These reduction spur gears 22, 23, and 24 are all made of reinforced synthetic resin. The reduction spur gear 24 meshes with a sun gear described later, and transmits the rotation of the motor 14. Reduction spur gear 24
Is the driving gear on the sun gear.

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 provided on a rotation shaft 29 supported by the head case 21 and the reduction gear support 12 so as to be swingable about the rotation shaft 29. The tip end side of the swing arm 28 projects outside the spool 10. A sun gear 30 is rotatably mounted on the rotating shaft 29 and meshes with the reduction spur gear 24. Reference numeral 31 denotes a swing gear provided on the swing arm 28 so as to be rotatable around a rotation shaft 32 provided on the tip end of the swing arm 28, and meshes with the sun gear 23. The oscillating gear 31 is pressed against the oscillating arm 28 by a friction material 33, and a frictional force is generated between the oscillating arm 28 and the oscillating gear 31, and between the oscillating gear 31 and the friction material 33. 28 becomes a resistance when rotating.

When the swing arm 28 swings in the direction of the spool 10, the swing gear 31 meshes with the spool gear 11 via an intermediate gear (winding gear) (not shown). Of course, the swing gear 31 may be spatially arranged so that the swing gear 31 can directly mesh with the spool gear 11 without using the intermediate gear. The swing gear 31 meshes with the rewind gear 35 when swinged in the opposite direction of the spool 10. Spool gear 11
Alternatively, the intermediate gear (the hoisting gear) and the rewind gear 35 are driven gears.

Reference numeral 34 denotes a stopper (projection) provided integrally with the swing arm 28, and projects in a direction opposite to the rotation shaft 32. The stopper 34 is attached to the head case 21
Into the window 37 that is open to the outside. The window 37 may be a recess provided in the head case. Inner walls of both ends of the window 37 in the direction in which the swing arm 28 swings are formed at the end of the stopper 34. The tip of the rotating shaft 32 is also formed on the stopper 32a. The tip of the rotating shaft 32 enters into an arc-shaped concave groove 36 formed on the camera body 26 side, and the rotation of the swing arm 28 causes the rotating shaft 32 to rotate.
Are in contact with the inner walls of both ends of the concave groove 36. The inner wall is formed at an angle.

The stoppers 34 and 32a are connected to the swing gear 31.
Is swung to engage with the spool gear 11 or the intermediate gear and the rewind gear 35 to wind up and rewind the film. Are engaged with each other with a predetermined backlash so that the gears can rotate smoothly.
The oscillating arm 28, the rotating shaft 32, the sun gear 30, the oscillating gear 31, and the like of the oscillating gear device 27 can be formed of synthetic resin. The rotating shaft 29 is preferably formed of metal because the swing load of the swing arm 28 is applied. However, as shown in the figure, the rotating shaft 29 is made of synthetic resin by being supported between the reduction gear support 12 and the head case 21 at both ends. It can also be formed.

Next, the friction material 33 will be described with reference to FIGS. The friction material 33 is formed from a spring material. First, a flat spring material is formed into a ring-shaped ring member 33a as shown in FIG. 2 by press working. The central hole 33b of the ring member 33a is formed in an elliptical shape. Four notches 33c are formed radially from the inner end of the central hole 33b.
Is formed, thereby forming four claw pieces 33d. In this case, the pair of claw pieces 33d are positioned on the short axis direction side of the oval center hole 33b, and the other pair of claw pieces 33d are positioned on the long axis direction side. The above-mentioned ring member 33a is bent along the line AA including the short axis of the above-mentioned ellipse, and as shown in FIG. I do. By bending the ring member 33a in this manner, the claw piece 3 on the short axis direction side of the central hole 33b is formed.
The tip of 3d tends to open slightly outward, while the tip of the long-side claw 33d tends to close slightly inward.
Although not shown, an ellipse in the case of a flat plate becomes a central hole of an ellipse which is almost circular in plan view.

The rotating shaft 32 is inserted through the central hole 33b of the friction material 33 formed as described above. Since the center hole 33b has a substantially circular shape, the rotation shaft 32 can be easily inserted. To fix the friction material 33 on the rotating shaft 32, the synthetic resin rotating shaft 32 is heated and heat caulked as shown in FIG. 1 while pressing the friction material 33 against the surface of the swing gear 31. Can be easily done. Therefore, assembly becomes easy. The tip end of the claw piece 33d on the short axis direction side of the friction material 33 elastically contacts the rotating shaft 32. The tip of the claw piece 33d on the long axis direction comes into loose contact with the outer periphery of the rotating shaft 32 or is in a non-contact state. Since the tip of the short piece 33d of the friction material 33 resiliently contacts the outer periphery of the rotary shaft 32 and the tip of the long piece of the nail 33d is substantially free from the outer circumference of the rotary shaft 32, When the rotating member 33 is fixed to the rotating shaft 32 in a compressed state with respect to the surface of the oscillating gear 31, a portion of the friction material 33 abutting on the surface of the oscillating gear 31 (an outer peripheral portion of the friction material corresponding to the claw piece 33d in the long axis direction) ) Is strongly pressed against the surface of the oscillating gear 31, and the frictional force can be effectively applied to the oscillating gear 31. FIG. 4 shows that the friction material 33 is
2 shows an embodiment in which a heat was caulked with a washer 38 interposed therebetween when fixing it to 2. By doing so, the friction material 33 can be more reliably prevented from coming off. The number of the claw pieces 33d is not limited to four, but may be appropriately provided in plural. Alternatively, a ring-shaped friction material may be used simply as in the related art.

When the drive motor 14 is rotated in the normal direction, the sun gear 30 is rotated via the motor gear 17 and the reduction spur gears 22, 23, 24. Gear 31 meshing with the friction material 3
3, a predetermined rotational torque is required, so that the rocking arm 28 is rocked by the resistance, and the stoppers 34 and 32a come into contact with the window 37 and the groove 36 respectively. At this time, the swing gear 31 meshes with the spool gear 11 via the intermediate gear with a predetermined backlash, 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, and the stoppers 34, 3
2a come into contact with the window 37 and the groove 36 in the opposite directions, respectively. The swing gear 31 meshes with the rewind gear 35, and the rewind gear 35 rotates. It is rewound inside.

As described above, since the stoppers 34 and 32a are provided on both the front and back sides of the swing arm 28 and are supported from both the front and back sides when they come into contact with each other, even if a large load is applied at the time of the last winding of the film. The swing arm 28 does not deform such as torsion, so that the phenomenon that the swing gear bites into the teeth of the intermediate gear or the spool gear as in the conventional case can be avoided, and the switching operation of the swing gear can be performed smoothly. It has the effect of being able to do it. In the above embodiment, the camera film winding mechanism has been described as an example, but the oscillating gear device 27 described in the above embodiment can be used for other purposes. Further, in the above-described embodiment, the friction material 33 is provided so as to apply a frictional force to the swing gear 31, but the same effect can be obtained by attaching the frictional force to the sun gear by attaching it to the rotation shaft of the sun gear. To play.

[0023]

According to the present invention, the friction material is a spring material.
The ring member formed in the shape of a ring is shallow in lateral shape
The swing gear is bent so as to form a circular arc
Is a friction material through which the rotating shaft is inserted and fixed on the rotating shaft.
There are multiple cuts in the radial direction from the inner end of the central hole
The tip of a plurality of nail pieces formed by forming
Is provided so as to elastically contact the rotating shaft of the oscillating gear ,
Assembling of the friction material is easy. Also, the friction material has a central hole
The ring member is bent by forming it into an almost elliptical shape.
By folding, the tip of the claw piece on the short axis direction side of the central hole tends to open slightly outward, while the tip of the claw piece on the long axis direction tends to close slightly inward. In the case of the above, the ellipse was changed from an ellipse to an elliptical center hole that is almost circular in plan view, so that the rotation shaft can be easily inserted, and the friction material is easily formed by heat-staking the synthetic resin rotation shaft. Can be fixed on the rotating shaft, thereby facilitating assembly.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of a gear group of a film winding mechanism.

FIG. 2 is a plan view of a ring member.

FIG. 3 is a side view of a friction material.

FIG. 4 is an explanatory view showing an example of a structure for fixing a friction material to a rotating shaft.

FIG. 5 is an explanatory diagram of a conventional swing gear device.

FIG. 6 shows a ring member of a conventional friction material.

FIG. 7 is a side view of a conventional friction material.

[Explanation of symbols]

 Reference Signs List 10 spool 12 reduction gear support 14 drive motor 16 rotation shaft 22, 23, 24 reduction spur gear 27 rocking gear device 28 rocking arm 29, 32 rotation shaft 32a stopper 30 sun gear 31 rocking gear 33 friction material 33a ring member 33b Central hole 33c Cut 33d Claw piece 34 Stopper 35 Rewind gear 36 Concave groove (per degree) 37 Window (per degree)

Claims (6)

(57) [Claims] 1. A sun gear rotating about a rotation axis on a swing arm provided to be swingable about a rotation axis and a sun gear meshing with a sun gear on a tip end of the rotation arm to form a rotation shaft. It has a oscillating gear that rotates at the center, and further has a sun gear or a friction material for imparting frictional force to the oscillating gear, and a rotational force is applied by a driving gear that meshes with the sun gear. time, the swing arm swings by resistance force due to the friction material, thereby the swing gear device provided to swing gear meshing with the gear arranged driven in rocking direction, the friction material , A ring formed of spring material
Is bent so that the lateral shape becomes a shallow arc shape,
The rotation shaft of the sun gear or swing gear is inserted through the center hole
A friction material fixed on the rotating shaft,
Multiple notches are formed in the radial direction from the inner end.
The tips of the plurality of claw pieces formed by
An oscillating gear device characterized by elastic contact. 2. The rotating shaft is made of a synthetic resin.
The shaft is heated and the friction material is
2. The device according to claim 1, wherein
Oscillating gear device. 3. The rotation of the friction material through a washer through a washer.
3. The structure according to claim 2, wherein the shaft is prevented from falling off.
Rocking gear device. 4. The center hole is formed in a flat spring material in a substantially elliptical shape, and when the ring member is bent so that the lateral shape becomes a shallow arc shape, the central hole is an ellipse that becomes almost circular in plan view. 4. The oscillating gear device according to claim 1 , wherein the oscillating gear device is provided. 5. The end of the claw located on the bent portion of the ring member among the ends of the claw resiliently contacts the rotating shaft of the oscillating gear. The oscillating gear device according to claim 1. 6. A spool rotatably supported in the 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 connected reduction gear device, a sun gear that rotates about the rotation axis on a swing arm that is swingably provided about the rotation axis, and a sun gear that meshes with the sun gear on the tip of the swing arm. It has an oscillating gear that rotates around a rotating shaft, and further has a sun gear or a friction material for applying frictional force to the oscillating gear, and the sun gear meshes with an external transmission gear of the reduction gear device. An oscillating gear device , wherein the oscillating gear of the oscillating gear device is a spool gear or a hoisting gear for transmitting a driving force to the spool gear and a rewind at an oscillating position of an oscillating arm. Select a rewind gear that transmits driving force to the mechanism. In the camera film winding mechanism that meshes with each other, the oscillating gear device according to claim 1, 2, 3, 4, or 5 is used for the oscillating gear device, wherein the main driving gear is the external transmission gear, A camera film winding mechanism, wherein the driven gear is a spool gear or a winding gear for transmitting driving force to the spool gear and a rewind gear for transmitting driving force to a rewinding mechanism.