JP3393914B2 - Driving force transmission mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving force transmission mechanism, and more specifically, one motor output is switched to three driving systems using a planetary gear mechanism so as to be transmitted to the operating mechanism of each driving system. The present invention relates to the driving force transmission device.

[0002]

2. Description of the Related Art In recent years, in cameras and the like that use a roll film having a width of 35 mm, automation in taking photographs has been advanced. For example, along with various automations such as automatic feeding drive for automatically winding and rewinding the film and feeding and retracting of the photographing optical system for autofocusing, the miniaturization of the camera body is also progressing. However, compatibility between such automation and miniaturization is an essential requirement for camera design. Therefore, it is quite natural to use one motor built in the camera body as a drive source for a plurality of operating mechanisms for such automation. Therefore, the transmission of the output from the drive motor is appropriately switched to each driven mechanism,
A driving force transmission mechanism that transmits to each driven mechanism is required. As such a driving force transmission mechanism, for example, there is a mechanism disclosed in JP-A-58-42035. This is to switch the driving force transmission by moving the switching gear using one electromagnet,
The driving force from one driving motor is transmitted to a plurality of driven mechanisms.

Further, the mechanism proposed by the present applicant in Japanese Patent Application No. 4-272478 is one in which one actuator and two planetary gears are used to switch the driving force transmission. is there. This mechanism has two planetary gear mechanisms each consisting of two sun gears, a carrier, and a planetary gear for winding and rewinding the film, and the rotation center of the two sun gears is set in the camera body. Each member is fixed and arranged.

[0004]

However, according to the means disclosed in JP-A-58-42035, the mechanism for switching the driving force transmission becomes complicated,
Since the number of parts also increases, a large space is required for the driving force transmission mechanism in the camera body, which is disadvantageous for downsizing the camera.

Further, according to the proposal of Japanese Patent Application No. 4-272478, since two planetary gear mechanisms are used, four gears, that is, two sun gears and a planet, respectively, for switching the driving force transmission. Since a gear is used, there are problems that the number of parts is large and a large space is required. Furthermore, the positions where the two sun gears are arranged must be fixed in the camera body, and other gears must be arranged and designed. When this mechanism is applied as a driving force transmission mechanism for a camera, There are significant restrictions on component placement and design during the design stage.

An object of the present invention is to solve the above-mentioned conventional problems and to reduce the number of parts as a simpler structure in a driving force transmission mechanism for transmitting the output of one driving motor to a plurality of driven mechanisms. Thus, the space occupied by the transmission mechanism itself in the camera is suppressed, and the degree of freedom in design is increased, thereby providing a driving force transmission mechanism that is low in cost and downsized.

[0007]

A first drive according to the present invention
The force transmission mechanism is the first gear that is normally and reversely rotated by the drive source.
A second gear that meshes with the first gear, and a second gear
A third gear that meshes with the first gear and a second gear.
A first connecting member that rotatably connects the rolling centers,
The rotation centers of the second gear and the third gear can be respectively rotated.
Second connecting member that is connected to the first gear and the one-way rotation of the first gear.
On the unidirectional revolution locus of the second gear
And the second gear is revolved to mesh with each other.
A first driven gear driven via a second gear,
The other of the second gears, which is performed by rotating the one gear in the other direction
The second gear is revolving around the orbital revolution path.
Driven by the second gear driven by the second gear
The dynamic gear and the second gear mesh with the first driven gear.
Locks the unidirectional revolution of the second gear when not in use
To revolve the third gear around the second gear.
Locking means for causing the third gear to rotate around the second gear.
It is arranged on the revolution path, and the third gear revolves.
Reciprocally meshed third driven tooth driven via the third gear
And a vehicle. The second according to the invention
The driving force transmission mechanism is the same as the first driving force transmission mechanism.
The second gear is the first driven tooth.
In the state of meshing with the car, the other direction of the second gear
The rotation of the first driven gear is driven by locking the rotation.
It is characterized by selecting the moving direction.

[0008]

[0009]

The second motor is driven by rotating the motor 1 which is the drive source and rotating the sun gear which is the first gear in one direction.
When the first planetary gear, which is a gear, revolves in one direction, the first planetary gear and the photographic optical system drive gear, which is the first driven gear, are meshed with each other, and the photographic optical system drive gear is driven to take an image. The optical system is driven to extend, and the first planetary gear and the winding gear, which is the second driven gear, are meshed with each other by the revolution of the first planetary gear in the other direction performed by the rotation of the sun gear in the other direction. By doing so, the winding gear is driven to transmit the driving force to the film winding mechanism to wind the film.

Further, when the first planetary gear is not meshed with the photographing optical system drive gear, the first direction of revolution of the first planetary gear is locked by a locking lever which is a locking means. By rotating the second planetary gear around the first planetary gear, the second planetary gear meshes with the rewinding gear that is the third driven gear, thereby driving the rewinding gear to the film rewinding mechanism. The driving force is transmitted to rewind the film.

The locking lever serving as locking means locks the revolution of the first planetary gear in the other direction while the first planetary gear is in mesh with the photographing optical system drive gear. The rotation driving direction of the photographing optical system driving gear is selected, that is, the photographing optical system is extended or retracted.

[0012]

The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a perspective view of an essential part of a driving force transmission mechanism showing an embodiment of the present invention. The driving force transmission mechanism of this embodiment is
A planet consisting of three gears that are in mesh with each other by decelerating the drive output of the motor, which is the drive source, in the gear case, and switching the reduced drive force between the forward and reverse rotation directions of the motor. A gear mechanism is used to transmit to any one of the three driven mechanisms. In addition, in the following embodiments, a case where the driving force transmission mechanism according to the present invention is applied to a camera will be described.

As shown in FIG. 1, a gear case 2 formed in a cylindrical shape, for example, is fixed to a camera body (not shown). In this gear case 2,
A motor 1 which is a drive source having a rotation shaft that is rotatably supported in forward and reverse directions is housed. Also, the above gear case 2
There are multiple gears (not shown) inside the
The rotational driving force of the motor 1 is decelerated. The decelerated rotational driving force of the motor 1 transmitted from the plurality of gears in the gear case 2 is provided at one outer end of the gear case 2 coaxially with the rotation shaft of the motor 1. It is designed to be transmitted to the sun gear 4, which is the first gear. Also, the above gear case 2
Plate-shaped rails 3A and 3B are provided on the outer peripheral surface of the so as to project outward and are axially supported by a second planetary gear 6, which is a third gear, as will be described later. The stop shaft 6a regulates the range of revolving motion of the second planetary gear 6.

On the rotation shaft of the sun gear 4, an arm 10A which is an L-shaped first connecting member is rotatably supported at its fulcrum 10Aa. This arm 10
A locking shaft 11 is provided so as to project forward at the tip portion 10Ab of one arm of A.
The rotation range of A is regulated. Also,
The other arm of the arm 10A has a control means for controlling the plunger 17, for example, a PI light-shielding portion 10A for shielding a photo interrupter (PI) or the like, as described later.
c is formed (see FIG. 3).

The tip portion 10Ab of one arm of the arm 10A
On the rear side of the sun gear 4, one end of an arm 10B, which is a second connecting member, is rotatably supported and meshes with the sun gear 4 via a friction member elastic member (not shown) which is a friction member. The first planetary gear 5, which is the second gear, is rotatably supported. The friction member elastic member, which is the friction member, is formed of, for example, an elastic member made of a spring member, a rubber member, or the like.
By interposing between the planetary gear 5 and the arm 10A, the first planetary gear 5 is allowed to idle between the first planetary gear 5 and the arm 10B when a load of a certain amount or more is applied to the first planetary gear 5. There is. Further, without interposing the friction member, the arm 10A may be pivotally supported around the rotation center of the gear 5 so that, for example, fitting friction occurs between the first planetary gear 5 and the arm 10A. .

At the fulcrum of the other end of the arm 10B, a second planetary gear 6, which is a third gear, is rotatably supported by a friction member (not shown). When a certain load or more is applied to the planetary gear 6, the second planetary gear 6 is designed to idle between itself and the arm 10B. The second planetary gear 6 and the arm 10B are also connected to each other by a friction member or a connecting means that generates friction, similar to the connection between the first planetary gear 5 and the arm 10A.

As described above, the locking shaft 6a is provided rearward at the center of rotation of the second planetary gear 6, and the locking shaft 6a moves along with the revolution of the second planetary gear 6. When the second planetary gear 6 is rotated, it is locked by the rails 3A and 3B provided on the outer peripheral surface of the gear case 2, so that the range of revolution of the second planetary gear 6 is restricted. ing.

Therefore, the arm 1 which is the first connecting member.
The sun gear 4 which is the first gear and the first planetary gear 5 which is the second gear are connected by 0A, and the first planetary gear 5 which is the second gear and the third planetary gear 5 by the arm 10B which is the second connecting member. The second planetary gear 6, which is a gear, is connected to each other, and the gears arranged adjacent to each other mesh with each other.

On the other hand, in the camera body, for example, via a gear train (not shown) for extending and retracting the photographing optical system including a photographing lens barrel and a photographing lens barrel,
In order to drive the photographing optical system (not shown) which is the first driven mechanism, for example, the photographing optical system driving gear 7 which is the first driven gear including a spur gear, a bevel gear, and a bevel gear,
The first planetary gear 5 is rotatably supported on the revolution path of the first planetary gear 5, and the photographing optical system drive gear 7 meshes with the first planetary gear 5 so that the rotational driving force of the motor 1 is applied to the photographing optical system. It is designed to be transmitted to.

Further, the camera body is provided with, for example, a spur gear,
A winding gear 8, which is a second driven gear including a bevel gear and a bevel gear, is rotatably supported on the revolution path of the first planetary gear 5. This hoisting gear 8 and the first
When the planet gears 5 mesh with each other, the rotational driving force of the motor 1 is transmitted to a film winding mechanism (not shown) via a film winding gear train (not shown) provided in the camera body. It has become.

Further, for example, a rewinding gear 9 which is a third driven gear, such as a spur gear, a bevel gear, and a bevel gear,
The second planetary gear 6 of the camera body is rotatably arranged on the orbit around the first planetary gear 5. When the rewinding gear 9 and the second planetary gear 6 mesh with each other, a film rewinding mechanism (not shown) is passed through a film rewinding gear train (not shown) provided in the camera body. And the rotational driving force of the motor 1 is transmitted.

On the other hand, a locking lever 12 as a locking means is arranged at a position facing the sun gear 4.
The locking lever 12 is rotatably supported by a fulcrum shaft 13 passing through its fulcrum. The support shaft 13 is provided in a direction orthogonal to the rotation shaft of the motor 1 and is formed of a round bar member whose one end is rotatably supported by the camera body.

A locking portion 12a is provided at the upper end of the locking lever 12. The locking portion 12a is formed on the surface facing the sun gear 4 so as to slightly project rearward, and as described above, when the arm 10A rotates as the sun gear 4 rotates, The rotation range of the arm 10A is regulated by locking the rotation of the locking shaft 11 arranged at the tip portion 10Ab of one arm of the arm 10A. Further, an iron core 18 is fixed to the back side of the locking portion 12a, and a plunger 17 is provided at a position facing the iron core 18 by a spring 16B.
In the figure, it is arranged so as to be biased in the direction of arrow F2. The urging force of the spring 16B in the F2 direction urges the locking lever 12 to rotate in the TB direction about the support shaft 13, while the spring 16A provided at the lower end of the locking lever 12 is rotated. By urging the locking lever 12 in the direction of arrow F1 in FIG. 1, the locking lever 12 is urged to rotate in the TA direction about the spindle 13. At this time, the locking lever 1 having the support shaft 13 as a shaft
The biasing forces of the springs 16A and 16B are set so that the biasing force of the rotational direction 2 is TB ≧ TA. Therefore, in order to prevent the locking lever 12 from rotating too much in the TB direction, the contact member 15 is attached to the camera body.
When the locking lever 12 is rotated in the TB direction by the spring 16A, a part of the locking lever 12 below the support shaft 13 is brought into contact with the contact member 15. The locking lever 12 is locked at a predetermined position.

Further, as shown in FIG. 2, the locking lever 12 is moved to TA by the suction operation of the plunger 17 described later.
A locking member 14 is arranged on the camera body to regulate the rotation of the arm 10A that rotates with the rotation of the sun gear 4 when the arm 1 rotates.
Locking shaft 11 arranged at the tip 10Ab of one arm of OA
However, by being locked by the locking member 14, the range of rotation of the arm 10A is regulated.

The operation of the driving force transmission mechanism of the above-mentioned one embodiment constructed as described above will be described below with reference to FIGS. 3 shows the operation of the drive force transmission mechanism when the film is wound, FIG. 4 is the operation of rewinding the film, FIG. 5 is the operation of the shooting optical system when it is extended, and FIG. FIG.

First, at the time of film winding, FIG.
As shown in, the sun gear 4 is rotated counterclockwise by the rotational drive of the motor 1. Along with this, the arm 10A pivotally supported by the sun gear 4 also rotates counterclockwise, and the first planetary gear 5 meshing with the sun gear 4 is engaged.
Rotates in the clockwise direction, and revolves in the counterclockwise direction around the sun gear 4 as the arm 10A rotates in the counterclockwise direction. Then, the first planetary gear 5 and the winding gear 8 mesh with each other and drive the winding gear 8, whereby the rotational driving force of the motor 1 is transmitted to the film winding mechanism via the film winding gear train. To be done.

On the other hand, the second planetary gear 6 meshing with the first planetary gear 5 rotates counterclockwise while rotating clockwise of the arm 10B as the first planetary gear 5 rotates clockwise. In accordance with the movement, it revolves clockwise around the first planetary gear 5. Since the locking shaft 6a pivotally supported by the second planetary gear 6 is locked by the rail 3A arranged on the outer peripheral surface of the gear case 2, the revolution of the second planetary gear 6 is also locked. It At this time,
The rotation of the second planetary gear 6 is in the idling state, and the transmission path of the rotational driving force thereof is in a state of being disconnected from any operating mechanism.

The locking lever 12 at the time of rewinding the film is in the state shown in FIG. 1, and the plunger 17 is not energized. First, as shown in FIG.
When the sun gear 4 is rotated clockwise by rotationally driving the motor 1, the arm 10 pivotally supported by the sun gear 4 is provided.
A also rotates clockwise, and the first planetary gear 5 meshing with the sun gear 4 revolves counterclockwise while revolving clockwise around the sun gear 4 together with the arm 10A. The locking shaft 11 of 10A is locked by the locking portion 12a of the locking lever 12,
The rotation of A and the revolution of the first planetary gear 5 are locked.

On the other hand, the counterclockwise rotation of the first planetary gear 5 causes the second planetary gear 6 meshing with the first planetary gear 5 to rotate clockwise and the arm 10B to rotate counterclockwise. . Then, since the second planetary gear 6 and the rewinding gear 9 mesh with each other, the rotational driving force of the motor 1 is transmitted to the film rewinding mechanism via the film rewinding gear train. At this time, before the engagement shaft 6a, which supports the second planetary gear 6, is engaged with the second planetary gear 6 before being engaged with the rail 3B arranged on the outer peripheral surface of the gear case 2. It is set so as to mesh with the rewinding gear 9.

Next, when the photographing optical system is extended, as shown in FIG. 2, first, the plunger 17 is energized so that the plunger 17 attracts the locking lever 12. That is, when the plunger 17 is energized, the iron core 1 fixed to the locking lever 12
8 is attracted to the plunger 17 side against the biasing force of the spring 16B in the F2 direction, and the locking lever 12 rotates in the TA direction in FIG. 2 by the biasing force of the spring 16A in the F1 direction. The rotation of the locking lever 12 in the TA direction is locked by the iron core 18 of the locking lever 12 contacting the tip of the plunger 17. While the plunger 17 is energized, the iron core 18 of the locking lever 12 is continuously attracted to the tip of the plunger 17.

At this time, as shown in FIG. 5, the motor 1 is rotationally driven to rotate the sun gear 4 clockwise.
Along with this, the arm 1 pivotally supported by the sun gear 4
0A also rotates clockwise, and at the same time, the first planetary gear 5 meshing with the sun gear 4 rotates counterclockwise,
As the arm 10A rotates clockwise, it revolves clockwise around the sun gear 4. When the locking shaft 11 that rotates together with the arm 10A comes into contact with the locking member 14, the rotational movement of the arm 10A and the revolution of the first planetary gear 5 around the sun gear 4 are locked. , The first planetary gear 5 and the photographing optical system drive gear 7 are meshed with each other, so that the motor 1
Is transmitted to the photographing optical system via a gear train for feeding the photographing optical system.

As described above, when the locking shaft 11 that rotates together with the arm 10A comes into contact with the locking member 14, the rotation of the arm 10A and the revolution of the first planetary gear 5 are locked. , The photo interrupter (PI) 19 by the PI light shielding unit 10Ac of the arm 10A.
Is shielded from light, the power supply to the plunger 17 is stopped. As a result, the iron core 18 of the locking lever 12 is
The attraction between the end of the plunger 17 and the plunger 17 is released, the locking lever 12 is rotated in the TB direction (see FIGS. 1 and 2) by the urging force of the spring 16B in the F2 direction, and the locking lever 12 is rotated. The lower end of the abuts against the abutment member 15 and is locked. Therefore, the locking shaft 11 is sandwiched between the locking portion 12a at the upper end of the locking lever 12 and the locking member 14, and the arm 10A is not rotated in either direction. The meshing state of the sun gear 4, the first planetary gear 5, and the photographing optical system drive gear 7 is fixed.

On the other hand, as the first planetary gear 5 rotates counterclockwise, the arm 10B rotates counterclockwise, and the second planetary gear 6 meshed with the first planetary gear 5 becomes Start rotation in the clockwise direction. Then, the locking shaft 6a that pivotally supports the second planetary gear 6 is locked to the rail 3B arranged on the outer peripheral surface of the gear case 2, so that the second planetary gear 6 also revolves. Be locked. At this time, the rotation of the second planetary gear 6 is in the idling state, and the transmission path of the rotational driving force thereof is in a state of being disconnected from any operating mechanism.

Subsequently, as shown in FIG. 6, when the taking optical system is retracted, the motor 1 is rotated to drive the sun gear 4 in the counterclockwise direction from the state when the taking optical system is extended. , Is rotated in the direction opposite to the one at the time of the feeding operation of the photographing optical system. Along with this, the arm 10A pivotally supported by the sun gear 4 also tries to rotate in the counterclockwise direction, but the arm 10A is locked to the locking portion 12a of the locking lever 12 by the locking shaft 11. Therefore, the first planetary gear 5 is engaged with the sun gear 4 without rotating.
Starts rotating in the clockwise direction on the spot, and drives the photographing optical system drive gear 7 meshing with the clockwise rotation in the retracting direction of the photographing optical system, that is, in the counterclockwise direction. Therefore, the rotational driving force of the motor 1 is transmitted to the photographing optical system via the gear train for retracting the photographing optical system.

On the other hand, the clockwise rotation of the first planetary gear 5 causes the second planetary gear 6 to rotate counterclockwise and the arm 10B to rotate clockwise. Therefore, the locking shaft 6 which supports the second planetary gear 6
a rotates with the arm 10B in the clockwise direction and is locked by the rail 3A arranged on the outer peripheral surface of the gear case 2, and the revolution of the second planetary gear 6 is also locked. At this time, the rotation of the second planetary gear 6 is in the idling state, and the transmission path of the rotational driving force thereof is in a state of being disconnected from any operating mechanism.

FIG. 7 is a circuit diagram of a camera to which an embodiment of the driving force transmission mechanism described above is applied. As shown in FIG. 7, the control means 21 including a CPU and the like provided in the camera body includes an autofocus (AF) arithmetic circuit 2
2 and a control circuit 24 are provided. The AF calculation circuit 22 is electrically connected to an autofocus (AF) unit 23 provided separately in the camera body to control the same. It is supposed to do. Further, in the control circuit 24, a signal line for controlling the driving force transmission mechanism is provided between the control circuit 24, the release button 25 provided in the camera body, and the plunger 17. And the photo interrupter (PI) 19 etc.
They are electrically connected to each other and control the driving force transmission mechanism.

In the camera constructed as described above, by pressing the release button 25 provided on the camera body, the control circuit 24 of the control means 21 composed of a CPU or the like.
When the switch of is turned on, the AF
The arithmetic circuit 22 controls the AF unit 23 to measure the distance to the subject. Then, the control circuit 24
Based on the distance measurement result measured by the unit 23,
Controls the operation of the driving force transmission mechanism. Then, the take-up and take-up driving operations of the photographing optical system are performed, and the film winding and rewinding driving operations are performed.

FIG. 8 illustrates a series of operations for taking a picture, that is, a feeding / retracting operation of a photographing optical system and a film winding / rewinding operation in a camera to which an embodiment of the driving force transmission mechanism is applied. It is a flowchart to do.

In the above driving force transmission mechanism, normally, the locking shaft 11 is locked by the locking shaft 11 in the state shown in FIG. 5 or 6, that is, in the state where the planet gear 1 is in mesh with the photographing optical system driving gear 7. It is in a state of being sandwiched between 12 and the locking member 14 and in a state where the motor 1 is not rotationally driven (initial state).

In this initial state, for example, in the state shown in FIG. 5, a description will be given of the feeding operation of the taking optical system including the taking lens barrel when taking a picture. First, as described in FIG. 7 above, the release button 25
When is pressed, the AF unit 23 operates,
As a result, the distance to the subject is measured. Based on the result of the distance measurement, as shown in FIG. 8, the motor 1 is driven in the feeding direction of the photographing optical system (here, the forward rotation direction as shown in FIG. 8) ((S11). here,
S indicates an operation step. The same applies hereinafter. ). Then, as described above with reference to FIG. 5, the sun gear 4 rotates in the clockwise direction, and the first planetary gear 5 meshing with the sun gear 4 rotates in the counterclockwise direction.
The photographing optical system drive gear 7 meshed with the planet gear 5 is rotated clockwise. As a result, when the photographing optical system is extended by a predetermined amount based on the distance measurement result by the AF unit 23 (S12), the rotation drive of the motor 1 is stopped (S13).

As described above, the photographing optical system is extended according to the distance measurement result of the AF unit 23, and the photographing operation is started when the preparation for photographing is completed. That is, the shutter provided on the camera body is opened for a predetermined time,
After a predetermined exposure is performed on the film surface, the shutter is closed and the photographing ends (S14).

When the photographing operation is completed, the taking-in operation of the photographing optical system is subsequently performed. First, the motor 1 is rotationally driven in a direction opposite to that of the above-described feeding operation of the photographing optical system,
That is, it is driven in the retracting direction (here, it is the reverse direction as shown in FIG. 8) of the photographing optical system including the photographing lens barrel and the like (S21). Then, as described above with reference to FIG. 6, the sun gear 4 rotates counterclockwise, and the first planetary gear 5 meshed with the sun gear 4 rotates clockwise, whereby the first planetary gear 5 rotates. The photographing optical system drive gear 7 meshing with the gear 5 is rotated counterclockwise. As a result, the photographing optical system is retracted to the initial position which is the initial state shown in FIG. 5 (S22), and the rotational drive of the motor 1 is stopped (S23).

Then, the film winding operation, which is a preparation for the next photography, is performed. First, the plunger 17
Is turned on and energized (S31), and the motor 1 is driven in the film winding direction (here, the reverse rotation direction as shown in FIG. 8) (S32). As a result, the shielding of the photo interrupter (PI) 19 is released (S33). That is, as shown in FIG. 2, the engaging lever 12 rotates in the TA direction by the attraction force of the plunger 17 and the urging force of the spring 16A in the F1 direction. As a result, the locking shaft 11 sandwiched between the locking portion 12a of the locking lever 12 and the locking member 14 is released. And
As described above with reference to FIG. 3, the sun gear 4 rotates counterclockwise and meshes with the first gear.
While the planetary gear 5 rotates clockwise, the arm 10A
The first planetary gear 5 and the winding gear 8 mesh with each other by revolving in the counterclockwise direction, and the winding gear 8 is driven, so that the rotational driving force of the motor 1 winds the film through the film winding gear train. It is transmitted to the mechanism and the film winding operation is performed. Then, at this time, the photo interrupter (PI) 19 shielded by the PI light shielding portion 10Ac of the arm 10A is
The light shielding is released with the counterclockwise rotation of (S33), so that the plunger 17 is turned off.
The power supply to the plunger 17 is cut off (S34). Therefore, the locking lever 12 is returned to the above-mentioned state shown in FIG. 1 by the urging force of the spring 16B in the F2 direction.

Here, after the timer is started (S
35), the film winding amount is counted by a detecting means for detecting the film perforation and counting the film winding amount, for example, a photo reflector (PR) or the like (S37). Then, in a case where a predetermined amount of perforation of the film is not detected during the fixed time set by the timer in step S35, for example, the number of perforations for one frame is not detected, the film is moved to the final end. That is, it is judged that the film is at the film end (END), and then the film rewinding operation is started (S36).

On the other hand, when a predetermined amount of perforation of the film is detected by the photoreflector (PR) which is the detecting means and one frame of the film is wound by the film winding mechanism, the rotational driving of the motor 1 is stopped. (S38). Then, the plunger 17 is turned on (ON) again to start energization (S39), and at the same time, the motor 1 rotates in the forward rotation direction, that is, in the feeding direction of the photographing optical system (S40). As a result, FIG.
5, the locking lever 12 rotates in the TA direction by the attraction of the plunger 17 and the urging force of the spring 16A in the F1 direction, and the sun gear 4 rotates clockwise as shown in FIG. The meshing first planetary gear 5 rotates counterclockwise and revolves clockwise by the arm 10A, the locking shaft 11 provided on the arm 10A is locked by the locking member 14, and the first planetary gear 5 and When the photographing optical system drive gear 7 meshes with the photographing optical system drive gear 7, the photographing optical system drive gear 7 is driven, and the rotational driving force of the motor 1 is transmitted to the photographing optical system via the gear train for retracting the photographing optical system. . Then, the photo interrupter (PI) 19 is shielded by the PI shielding unit 10Ac of the arm 10A (S4).
1). As a result, the plunger 17 is turned off.
Then, the electricity to the plunger 17 is cut off (S4
2). Therefore, the photographing optical system returns to the initial position which is the initial state (RETURN), and stands by until the next photographing operation.

On the other hand, in steps S36 and S37, when the predetermined amount of film perforation by the photoreflector (PR) or the like is not detected within the fixed time set by the timer, as described above, The film rewinding operation is performed.

First, in step S37, if the predetermined amount of film perforation by the photo reflector (PR) or the like is not detected and the final end of the film, that is, the film end (END) is detected (S51),
The motor 1 is driven in the film rewinding direction (here, the forward rotation direction as shown in FIG. 8) (S52). As a result, as described above with reference to FIG. 4, the sun gear 4 rotates clockwise, and the first planetary gear 5 rotates counterclockwise while the arm 10A rotates clockwise. The first planetary gear 5 is also revolved clockwise, the locking shaft 11 disposed on the arm 10A is locked by the locking portion 12a of the locking lever 12, and meshes with the first planetary gear 5. The second planetary gear 6 that is rotating revolves in the counterclockwise direction as the arm 10B rotates in the counterclockwise direction while rotating in the clockwise direction, and the second planetary gear 6 and the rewinding gear 9 mesh with each other. The rewinding gear 9 is driven to transmit the rotational driving force of the motor 1 to the film rewinding mechanism through the film rewinding gear train to rewind the film.

During the film rewinding operation, the film rewinding amount is counted by detecting the perforation of the film by the photoreflector (PR) or the like (S53) and set by the timer. If the perforation of the film is not detected during the set time (timer time = A) and the set time (timer time = A) elapses (S55), the control by the CPU etc. indicates that the rewinding of the film is completed. It is judged by the control circuit 24 of the means 21, the rotational drive of the motor 1 is stopped (S56), and a series of photographing processing is ended.

As described above, according to the above embodiment,
Since the planetary gear mechanism can be skillfully utilized to perform the unwinding and rewinding operations of the photographing optical system and the film winding and rewinding operations by simply rotating one motor in the forward and reverse directions, a simpler and smaller size can be achieved. A realized driving force transmission mechanism can be provided. Furthermore, when this driving force transmission mechanism is applied to a camera, space is available due to miniaturization, so that cost reduction and miniaturization of the camera itself can be realized, and design flexibility increases. , The internal arrangement of the camera can be efficiently designed.

[Additional Notes] (1) A plurality of gears that are in mesh with each other adjacent to each other and a plurality of gears that rotatably connect the centers of rotation of two adjacent gears of the above three or more gears. A connecting member; and a friction member interposed between at least one gear of the two gears connected by the plurality of connecting members and the connecting member pivotally supporting the gear.
In a driving force transmission mechanism in which when rotating one of the two gears connected to the plurality of connecting members, the other gear revolves around the one gear, the friction member is a gear. And an elastic member provided between the connecting member and the connecting member.

(2) In the driving force transmission mechanism described in appendix 1, the elastic member is formed of a spring member.

(3) In the driving force transmission mechanism described in appendix 1, the elastic member is formed of a rubber member.

In the driving force transmission mechanism according to the above-mentioned Supplementary Notes 1 to 3, the friction member interposed between the gear and the connecting member is an elastic member made of, for example, a spring member or a rubber member. In a normal state, the gear revolves with the rotation of the connecting member supporting the gear, but when a certain load or more is applied to the gear, the gear rotates the shaft. It will idle between the supporting connecting member. Therefore, in the above planetary gear mechanism,
By locking the revolution of the gear, switching of the driving force can be easily realized with a simpler mechanism.

(4) Three or more gears that are mutually meshed with each other and the rotation centers of two adjacent gears of the three or more gears are rotatably connected and at least one of them is A plurality of coupling members having friction between the gears, and when one of the two gears coupled to the plurality of coupling members is rotated, the other gear is A driving force transmission mechanism that revolves around one gear.

(5) In the driving force transmission mechanism according to the fourth aspect, the friction is a fitting friction between the one gear and the connecting member.

(6) In the driving force transmitting mechanism described in the supplementary note 4, the friction is generated by the friction means elastic member provided between the gear and the connecting member.

(7) In the driving force transmission mechanism described in appendix 6, the elastic member is formed of a spring member.

(8) In the driving force transmission mechanism described in appendix 6, the elastic member is formed of a rubber member.

In the driving force transmission mechanism according to the above supplementary notes 4 to 8, the friction generated between the gear and the connecting member is, for example, a fitting friction generated between the gear and the connecting member, Further, for example, it is generated by providing a friction means elastic member made of a spring member, a rubber member or the like between the gear and the connecting member.

As described above, when the friction is generated between the gear and the connecting member, the revolution of the other gear to be revolved around one gear is locked to switch the transmission of the driving force. Thus, it is possible to provide a driving force transmission mechanism capable of reliably transmitting the driving force to the driven mechanism.

(9) First rotation by the drive source
A gear, a second gear that meshes with the first gear, and a second gear
A third gear that meshes with a gear, a first connecting member that rotatably connects the rotation centers of the first gear and the second gear, and a rotation center of the second gear and the third gear. A second coupling member that is movably coupled to the second coupling member is disposed on a revolving locus in one direction of the second gear that is rotated by one direction of the first gear, and the second gear revolves to mesh with each other. A first driven gear that is driven via a second gear, and the second gear that revolves on the revolution path of the second gear in the other direction that is performed by the other direction rotation of the first gear; A second gear that is meshed with and is driven through the second gear.
Locking the third gear around the second gear by locking the one-directional revolution of the second gear when the driven gear and the second gear are not meshed with the first driven gear. A locking means for revolving and a third driven gear which is arranged on the revolving locus of the third gear around the second gear and which meshes when the third gear revolves and is driven via the third gear. A drive force transmission mechanism including a drive gear.

(10) In the driving force transmission mechanism described in Supplementary Note 9, the drive source is a motor. (11) In the driving force transmission mechanism according to the ninth aspect,
The first driven gear is connected to a mechanism that drives a photographing optical system in the camera.

(12) In the driving force transmitting mechanism as described in Supplementary Note 9, the second driven gear is connected to the film winding mechanism in the camera.

(13) In the driving force transmission mechanism described in appendix 9, the third driven gear is connected to the film rewinding mechanism in the camera.

(14) In the driving force transmitting mechanism as described in Supplementary Note 9, the locking means includes the second gear and the first gear.
The rotation driving direction of the first driven gear is selected by locking the revolution of the second gear in the other direction while meshing with the driven gear, and the first driven gear is selected. Is connected to a mechanism for driving the photographing optical system.

(15) In the driving force transmission mechanism described in appendix 9, the first to third gears are appropriately selected from spur gears, bevel gears and bevel gears.

(16) In the driving force transmission mechanism described in appendix 9, the first to third driven gears are appropriately selected from a spur gear, a bevel gear, and a bevel gear.

In the driving force transmission mechanism described in any of the above supplementary notes 9 to 16, the second gear and the first driven gear mesh with each other by the revolution of the second gear by the one-direction rotation of the first gear. , By transmitting the driving force to a mechanism for driving the photographing optical system, and by the revolution of the second gear by the rotation of the first gear in the other direction, the second gear and the second driven gear mesh with each other, The driving force is transmitted to the film winding mechanism.

Further, by locking the unidirectional revolution of the second gear by the locking means in a state where the second gear is not meshed with the first driven gear, the third gear is rotated around the second gear. By revolving with, the third gear and the third driven gear mesh with each other, thereby transmitting the driving force to the film rewinding mechanism.

The locking means locks the photographic optical system by locking the second gear in the other direction while the second gear is meshing with the first driven gear. The rotational driving direction of the first driven gear connected to the driving mechanism is selected.

The first, second, and third gears and the first, second, and third driven gears are appropriately selected from spur gears, bevel gears, bevel gears, and the like. Become.

As described above, the planetary gear mechanism composed of the first, second, and third gears and the first and second connecting members is skillfully utilized, and the mechanism is simpler and one driving source is used. It is possible to provide a driving force transmission mechanism that transmits a driving force to each of the three driven systems by switching a certain motor output.

[0073]

As described above, according to the present invention, in the driving force transmission mechanism for transmitting the output of one driving motor to a plurality of driven mechanisms, the number of parts is reduced by a simpler structure. By suppressing the space occupied by the mechanism itself and further increasing the degree of freedom in design, it is possible to provide a driving force transmission mechanism that realizes cost reduction and downsizing.

[Brief description of drawings]

FIG. 1 is a perspective view of essential parts showing an embodiment of a driving force transmission mechanism of the present invention.

FIG. 2 is a perspective view of an essential part of the mechanism of FIG. 1 when a plunger performs a suction operation.

FIG. 3 is a detailed view of the essential parts showing the operation during film winding in the mechanism shown in FIG.

FIG. 4 is a detailed view of the essential parts showing the operation during film rewinding in the mechanism shown in FIG. 1;

FIG. 5 is a detailed view of the essential parts showing the operation of the taking optical system when it is extended in the mechanism of FIG. 1;

FIG. 6 is a detailed view of the essential parts showing the operation of the taking optical system when it is retracted in the mechanism of FIG. 1;

7 is a circuit configuration diagram of a camera to which the mechanism of FIG. 1 is applied.

FIG. 8 is a flowchart illustrating a series of shooting processes of feeding and retracting the photographing optical system, film winding and rewinding in the camera of FIG.

[Explanation of symbols]

1 ………… Motor (drive source) 4 ………… Sun gear (1st gear) 5 ………… 1st planetary gear (2nd gear) 6 ... 2nd planetary gear (3rd gear) 7 ......... Gearing optical system drive gear (first driven gear) 8 ………… Winding gear (second driven gear) 9: Rewinding gear (third driven gear) 10A ... Arm (first connecting member) 10B ......... arm (second connecting member) 12 ………… Locking lever (locking means)

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Claims (2)

(57) [Claims] 1. A first gear which is normally and reversely rotated by a drive source.
When a second gear meshing with the first gear, a third gear meshing with the second gear, respectively rotated friendly center of rotation between the first gear and the second gear
The first connecting member that is operatively connected to each other and the rotation centers of the second gear and the third gear can be respectively rotated.
Second connecting member that is operatively connected, and the second gear that is performed by one-way rotation of the first gear.
It is arranged on the revolution path in one direction and the second gear revolves.
By being engaged with each other to be driven through the second gear.
1 driven gear and the 2nd gear performed by the other direction rotation of the 1st gear
The second gear is revolved around the revolution path in the other direction.
By being engaged with each other to be driven through the second gear.
2 The driven gear and the second gear do not mesh with the first driven gear.
To lock the unidirectional revolution of the second gear in the stationary state
Locking by which the third gear revolves around the second gear
Means and the third gear arranged on the revolution path around the second gear.
And the third gear revolves to mesh with the third tooth.
And a third driven gear that is driven via a vehicle . 2. The locking means comprises the second gear and the second gear.
1 When the second gear is engaged with the driven gear,
By locking the revolution in the other direction, the first driven tooth
2. The rotation driving direction of the vehicle is selected.
The driving force transmission mechanism described in.