JPH09211592A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regulate the rotation of a spool even in a state where the transmission of driving between a spool and a motor is intrrupted by providing a camera with a driving transmission mechanism selectively transmitting the output of a driving source to the spool and a rotation regulating mechanism attached on the spool. SOLUTION: A driving transmission state is switched by the counterclockwise rotation of a sun gear 18. Meanwhile, a cylindrical surface 12b is formed at one end of the spool 12. A kick spring 60 having smaller winding diameter than the diameter of the cylindrical surface 12b is fit in the cylindrical surface 12b. A coil part is frictionally coupled with the cylindrical surface 12b by the tightening force of the spring 60. By attaching the rotation regulating mechanism on the spool 12, the spool 12 is prevented from being inadvertently rotated even in the case a friction mechanism exists, adjacent gears do not exist, and a planet gear 20 is not meshed with the gear 12a of the spool 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera which switches outputs from a drive source to drive a plurality of systems such as a film winding mechanism, a rewinding mechanism, or a shutter mechanism.

[0002]

2. Description of the Related Art In recent years, with the progress of computerization of cameras, film winding and rewinding operations and shutter mechanism charging operations are performed by driving a motor. In the case of performing one of these operations by driving one motor, a planetary gear is provided in the drive transmission path of the motor, and the drive transmission state is switched by this planetary gear. Here, one or a plurality of drive transmission gears are provided adjacent to the spool for winding the film. When the spool is rotationally driven, the planetary gear described above meshes with the drive transmission gear, and when the spool is not rotationally driven, the planetary gear is separated from the drive transmission gear. By the way, in a state where the planetary gear and the drive transmission gear mesh with each other, free rotation of the spool is restricted by the load of the motor through the drive transmission path, but when the planetary gear and the drive transmission gear are separated, Since there is no regulation due to the load on the spool, the spool may rotate due to the vibration of the camera or the curl of the film, and the film wound on the spool may loosen. In order to prevent the winding looseness, a friction mechanism is provided between the drive transmission gear adjacent to the spool and the camera body, and unnecessary rotation of the spool is restricted by this frictional force.

[0003]

However, in order to reduce the size of the camera and reduce the cost, the drive transmission gear does not have a drive transmission gear having a friction mechanism, and the planet gear directly meshes with the gear formed on the spool. If the drive transmission path is shortened, the rotation of the spool cannot be restricted when the planetary gear is separated. The present invention is
An object of the present invention is to prevent unnecessary rotation of the spool even if a gear having a friction mechanism and a gear adjacent to the spool is not used to shorten the drive transmission path.

[0004]

In order to solve the above-mentioned problems, the present invention provides a drive source for driving a plurality of systems, a spool for winding a film, and an output of the drive source. It is characterized by having a drive transmission mechanism for selectively transmitting to the spool and a rotation restricting mechanism provided on the spool.

[0005]

According to the present invention, since the spool is provided with the rotation restricting mechanism, the spool does not rotate carelessly even when the drive transmission path between the spool and the drive source is disconnected.

[0006]

1 is an external view of a camera to which the present invention is applied. The camera 100 has a cover member 2 as an exterior. In the upper part of one end side of this cover member 2,
A release button 1 is provided. A lid 3 of the cartridge chamber for accommodating the film cartridge F is provided on the side surface of the camera 100, and the lid 3 is opened to the side when the film cartridge F is attached and detached to open the cartridge chamber. In addition, a lens mount 4 is provided on the front surface of the camera 100.
Is provided, and various lenses can be selectively attached to and detached from the camera 100.

FIG. 2 is a schematic front view showing a main part relating to film conveyance, FIG. 3 is a schematic bottom view showing a main part relating to film conveyance, and FIG. 4 is a sectional view showing a mechanism for transmitting drive from a motor to a spool. 5 is a bottom view showing a mechanism for transmitting drive from the motor to the spool, and FIG. 6 is a sectional view of the rotation restricting mechanism. Reference numeral 10 denotes a main body frame, and the main body frame 10 has a photographing image frame 10a located behind the lens. On the other hand, the film cartridge F holding the reel wound with the film inside is housed in the cartridge chamber located inside the lid 3 described above, and in this housed state, the reel of the film cartridge F is supported by the main body frame 10. It is engaged with the fork 15. A shutter drive mechanism 11 is provided beside the image frame 10a, and a spool 12 for winding a film is rotatably supported by the main body frame 10 outside the shutter drive mechanism 11.

Inside the spool 12, a motor 16 which is a drive source and is rotatable in both forward and reverse directions is provided. The rotation of the motor 16 is transmitted through the reduction gear mechanism 17 to the sun gear 1
8 is transmitted. A lever 19 is attached to the rotation shaft of the sun gear 18.
Is rotatably supported, and a planetary gear 20 is rotatably supported by the lever 19 while meshing with the sun gear 18. Further, a lever 21 is rotatably supported on the rotation shaft of the sun gear 18, and the lever 21
The planetary gear 22 is rotatably supported in the state of being meshed with the sun gear 18.

The deceleration mechanism 17, as shown in FIGS. 4 and 5, is a small pulley 5 fitted to the rotating shaft of the motor 12.
0, a large pulley 51a and a small gear 51 which are integrally formed
b, a transmission belt 52 wound around the small pulley 50 and the large pulley 51a, and a large gear 53 meshing with the small gear 51b.
a, a small gear 53b integrally formed with the large gear 53a, and a large gear 54 meshed with the small gear 53b and integrally formed with the sun gear 18 described above. Further, as shown in FIG. 5, an encoder plate 51c is integrally formed on the pulley 51a, and a signal corresponding to a detection pattern of the encoder plate 51c is output by the photo interrupter 55, so that the rotation state of the motor 16 is changed. To be detected.

On the orbit of the planetary gear 20, a gear 12a formed on the spool 12 is located. In addition, the planetary gear 22
The gear 23 and the gear 27 as the driving force input unit of the shutter drive mechanism 11 described above are located on the orbit.
This gear 27 is a cam 2 that controls the drive transmission state described later.
It meshes with a gear 26 having 6a and 26b formed therein. Also,
A lever 24 and a lever 25 that swing with the movement of the cams 26a and 26b are provided at positions where they come into contact with the cam surfaces of the cams 26a and 26b formed on the gear 26.

Further, the rotation of the reduction mechanism 17 described above is
It is output from a small gear 54b that is integrally formed with the large gear 54a, and is transmitted to a gear 29 that meshes with a sun gear 30 via a reduction mechanism 28. A lever 31 is rotatably supported on the rotation shaft of the sun gear 30, and a planetary gear 32 is rotatably supported on the lever 31 while being meshed with the sun gear 30. On the orbit of the planetary gear 32, there are a gear 33 and a gear 3 which rotate integrally with the fork 15 described above.
A gear 34 meshing with the gear 3 is arranged. The planet gear 32 rotates in the clockwise direction in the figure during drive transmission, and when the planet gear 32 and the gear 33 mesh with each other, the gear 33 rotates in the clockwise direction in the figure, so that the reel of the film cartridge F becomes a film. When the planetary gear 32 and the gear 34 mesh with each other in the rewinding direction, the gear 33 rotates counterclockwise in the figure, whereby the reel of the film cartridge F rotates in the film feeding direction.

The drive transmission state is switched by the sun gear 18
The shutter mechanism 1 is rotated by a counterclockwise rotation in FIG.
1, the drive of the spool 12, the fork 15 is the sun gear 18
Rotate in a clockwise direction. That is, when the sun gear 18 rotates counterclockwise in the figure, the lever 21 also rotates counterclockwise, the planetary gear 22 meshes with the gear 27, and the gear 2
A drive transmission state, which will be described later, is selected by the cams 26a and 26b formed on the drive shaft 6. At this time, the locked portion 21a of the lever 21 rotates counterclockwise in the drawing as the sun gear 18 rotates, and retracts from the moving area of the locking portion 24a formed on the lever 24. At the same time, the lever 19 also rotates counterclockwise, the planetary gear 20 is disengaged from the gear 12a formed on the spool 12, and the locked portion 19a of the lever 19 is locked on the lever 24. Part 24a
Move from the moving area.

Further, the gear 29 is always rotationally driven in the same direction as the sun gear 18 via the speed reduction mechanism 28, and when the drive transmission state is switched, the gear 29 rotates counterclockwise in the figure, and the sun gear 30 moves. Rotate clockwise. As the sun gear 30 rotates, the lever 31 also rotates clockwise, and the planetary gear 32 becomes disengaged from the gear 33 and the gear 34, and the locked portion 31 of the lever 31
a and 31b are retracted from the moving area of the locking portion 25a of the lever 25.

When only the spool 12 is rotationally driven to wind the film on the spool 12, the locking portion 24a of the lever 24 is retracted from the moving range of the locked portion 19a and can be brought into contact with the locked portion 21a. It is moved by the cam 26a to the position shown in FIG. At the same time, the lever 25 is moved by the cam 26b to a position where the locking portion 25a can contact the locked portion 31b.

In this state, when the sun gear 18 rotates clockwise, the planetary gear 20 meshes with the gear 12a of the spool 12, and then the spool 12 rotates. At this time, the locked portion 21a comes into contact with the locking portion 24a so that the lever 2
Since the rotation of No. 1 is restricted, the planetary gear 22 does not mesh with the gear 23. Further, since the locked portion 31b contacts the locking portion 25a and the rotation of the lever 31 is restricted, the planetary gear 32 does not mesh with the gears 33 and 34.

When the shutter mechanism 11 is charged, the lever 24 is moved by the cam 26a to a position where the locking portion 24a is retracted from the moving range of the locked portion 21a and can be brought into contact with the locked portion 19a. It In this state, sun gear 1
When 8 rotates clockwise, the planetary gear 22 meshes with the gear 23, and then the shutter mechanism 11 is charged. At this time, the locked portion 19a comes into contact with the locking portion 24a to restrict the rotation of the lever 19, so that the planetary gear 2
0 does not mesh with the gear 12a.

When the fork 15 is driven to rotate in the film winding direction, the lever 25 is moved by the cam 26b to a position where the locking portion 25a can contact the locked portion 31. In this state, when the sun gear 18 rotates clockwise, the sun gear 30 rotates counterclockwise and the planetary gear 32
When the lever rotates to a position where it meshes with the gear 33, the locked portion 31a comes into contact with the locking portion 25a and the rotation of the lever 31 is restricted. After that, the gear 33 rotates counterclockwise in the figure, and the film is wound.

On the other hand, when the fork 15 is rotationally driven in the film feeding direction, the lever 25 is moved by the cam 26b to the position where the locking portion 25a does not contact the locked portions 31a and 31b. In this state, when the sun gear 18 rotates clockwise, the sun gear 30 rotates counterclockwise, and when the planet gear 32 rotates to a position where it meshes with the gear 34, the locked portion 31c contacts the stopper 35. The rotation of the lever 31 is restricted by the contact. After that, the gear 34 rotates counterclockwise in the figure, and the gear 33 rotates clockwise to feed the film.

Next, the rotation restricting mechanism provided on the spool 12 will be described. As shown in FIGS. 4 and 6, a cylindrical surface 12b is formed at one end of the spool 12. A kick spring 60 having a winding diameter smaller than the diameter of the cylindrical surface 12b is fitted on the cylindrical surface 12b. The kick spring 60 is composed of a coil portion 60a and end portions 60b and 60c, and the coil portion 60a is frictionally coupled to the cylindrical surface 12b by the winding force of the kick spring 60. A locking portion 10b is formed on the body frame 10, and the end portion 60b is formed.
The end portion 60c and the end portion 60c are arranged so as to sandwich the locking portion 10b with a space slightly wider than the width of the locking portion 10b. Further, a pressing member 61 that covers the outer circumference of the coil portion 60a of the kick spring 60 is fixed to the body frame 10.

When the spool 12 is in a stopped state, a pressure contact force is generated between the coil portion 60a and the cylindrical surface 12b due to the winding tightening force of the kick spring 60, and both are frictionally coupled to each other, and the spool 12 has a predetermined shape. Even if the rotational force is transmitted,
Since the ends 60b and 60c contact the locking portion 10b, the rotation of the spool 12 is restricted and the stopped state is maintained. When a torque larger than the predetermined torque is transmitted, the spool 12 starts rotating. At this time, the coil portion 60a is loosened by the reaction force of one of the end portions 60b and 60c pushing the locking portion 10b depending on the rotation direction. Coil part 60
The frictional coupling force between the cylindrical surface 12b and the cylindrical surface 12b is reduced by loosening a, and the rotational force transmitted to the spool 12 is constant when the rotational coupling force exceeds the frictional coupling force between the cylindrical surface b and the coil portion 60a. The spool 12 rotates while maintaining the frictional coupling force. In addition, the pressing member 61 includes the coil portion 60.
By covering the outer periphery of a, the coil portion 60c is prevented from being loosened more than necessary.

As the rotation restricting mechanism, in addition to the kick spring described above, a friction member such as felt may be pressed against the spool, or a member such as a slip clutch may be provided.

As described above, by providing the spool 12 with the rotation restricting mechanism, even if the planetary gear 20 does not mesh with the gear 12a of the spool 12 even if the planetary gear 20 has a friction mechanism and no adjacent gear, Inadvertent rotation can be prevented.

Further, a motor 16 is arranged in the spool 12, and the sun gear 1 for switching the drive with the speed reducing mechanism 17 is arranged.
8. The planetary gear 20 is arranged in the vicinity of the spool, and the planetary gear is directly meshed with the gear 12a of the spool 12, so that the drive transmission path is shortened, the drive force transmission efficiency is improved, and the number of parts is increased. It is possible to reduce the size and cost of the camera by reducing

[0024]

As described above, in the present invention,
In a configuration in which the planetary gear that switches the drive transmission state directly meshes with the spool, the rotation of the spool can be restricted even when the drive transmission state of the spool and the motor is disconnected.

[Brief description of drawings]

FIG. 1 is an external view of a camera to which the present invention is applied.

FIG. 2 is a schematic front view showing a main part relating to film transport.

FIG. 3 is a schematic bottom view showing a main part relating to film transport.

FIG. 4 is a sectional view showing a drive transmission mechanism.

FIG. 5 is a bottom view showing a drive transmission mechanism.

FIG. 6 is a cross-sectional view showing a rotation restricting mechanism.

[Explanation of symbols]

 10: Main body frame 10b: Locking part (rotation restriction mechanism) 11: Shutter drive mechanism 12: Spool 12b: Cylindrical surface (rotation restriction mechanism) 16: Motor 17: Reduction mechanism 18: Sun gear 20: Planetary gear 60: Kick spring (Rotation control mechanism) 100: Camera F: Film cartridge

Claims (3)

[Claims] 1. A camera for driving a plurality of systems by switching an output from a drive source, the drive source, a spool for winding a film, and an output of the drive source selectively transmitted to the spool. A drive transmission mechanism for controlling the rotation of the camera, and a rotation restricting mechanism provided on the spool. 2. The spool has an integrally formed gear part, and the drive transmission mechanism has a planetary gear that can be engaged with and disengaged from the gear part.
The described camera. 3. The camera according to claim 2, wherein the drive source is disposed inside the spool.