JP2001021021A - Driving force transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small type driving force transmission device capable of switching plural receivers to which the driving force is transmitted. SOLUTION: A driving force transmission device is provided with a motor 1 as a driving source, a rotational amount detecting mechanism 2 for the motor 1, a driving shaft 4 which is rotated by driving force of the motor 1 and which transmits the power for driving driven gears 6, a moving gear 5 which is arranged-installed on the driving shaft 4 and which linearly moves to a position at which the driven gears are driven by turning movement of the driving shaft 4 and a positpon to which the moving gear is retract from the driven gears 6, the three driven gears 6 for transmitting the driving force of the motor 1 arranged at a position at which the motor can be engaged with the moving gear 5, to a specified driven system, a moving gear position holding mechanism 7 for holding the moving gear 5 at a position at which the moving gear can be engaged with the respective driven gears 6, and a CPU 8 for controlling the motor 1 and the moving gear position holding mechanism 7 in order to engage the moving gear 5 with any one of the driven gears 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a driving force transmission device,
More specifically, the present invention relates to a driving force transmission device that switches a transmission destination of driving force.

[0002]

2. Description of the Related Art In recent years, cameras have been provided with various driven mechanisms such as a film feeding mechanism and a lens moving mechanism. On the other hand, due to demands for miniaturization, low cost, and the like, various efforts have been made to drive these various driven mechanisms with a single drive source, for example, a single motor. For example, Japanese Patent Application Laid-Open No. 5-321986 discloses a technical means in which a single motor is provided, the driving force of the motor is switched by a planetary gear mechanism, and a plurality of driven mechanisms are appropriately switched and driven as described above. Is disclosed. That is, the driving force switching mechanism revolves the planetary gear by one-way rotation of the motor, selects the driven gear corresponding to the drive destination, selects the driven gear, and then rotates through the driven gear in the other direction. Thus, the driving force is transmitted to the driven mechanism.

[0003]

However, the driving force switching device proposed in the above-mentioned Japanese Patent Application Laid-Open No. 5-321986 requires a revolving space for the planetary gear to revolve. When there are a plurality of drive mechanisms and these are located at positions separated from each other, many gears are required outside the drive force switching device, creating a useless space.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a small driving force transmission device capable of switching between a plurality of driving force transmission destinations. .

[0005]

According to a first aspect of the present invention, there is provided a driving force transmitting apparatus comprising: a driven gear; and a power source for driving the driven gear. And a moving gear that is linearly movable between a position on the drive shaft for driving the driven gear and a position retracted from the driven gear by rotating the drive shaft. , Is provided.

In order to achieve the above object, a second aspect of the present invention is provided.
The driving force transmission device is a driving force transmission device, wherein a plurality of driven gears, a driving shaft for transmitting power for selectively driving the driven gear, and the driving shaft are rotated to rotate the driving shaft. On a shaft, there is provided a moving gear linearly movable between a position for driving the driven gear and a position retracted from the driven gear.

[0007] In order to achieve the above object, a third aspect of the present invention is provided.
The driving force transmission device is a driving force transmission device, wherein a plurality of driven gears, a driving shaft for transmitting power for selectively driving the driven gear, and the driving shaft are rotated to rotate the driving shaft. A moving gear linearly movable on a shaft between a position for driving the driven gear and a position retracted from the driven gear, and holding means for holding the moving gear at a predetermined position. Features.

In order to achieve the above object, a fourth aspect of the present invention is provided.
In the driving force transmission device, the driving force transmission device includes a driving source, a plurality of driven gears, a driving shaft for transmitting power of the driving source for selectively driving the driven gear, and a rotating shaft. A moving gear linearly movable on the drive shaft between a position for driving the driven gear and a position retracted from the driven gear, and a holding means for holding the moving gear at a predetermined position And a control means for controlling the driving source and the holding means for meshing the moving gear with any one of the driven gears.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing a main configuration of a driving force transmission device according to an embodiment of the present invention.

As shown in FIG. 1, a driving force transmission device according to the present embodiment includes a motor 1 as a driving source of each driven mechanism disposed in a camera to which the driving force transmission device is applied, Motor rotation amount detection mechanism 2 for detecting the rotation amount 1
A driving force transmitting mechanism 3 for transmitting the driving force of the motor 1 to the driving shaft 4; and a driving force transmitting mechanism 3 for engaging with the driving force transmitting mechanism 3 and rotating by the driving force of the motor 1 and driving the driven gear 6. A drive shaft 4 for transmitting power, and a moving gear disposed on the drive shaft 4 for linearly moving between a position where the driven gear 6 is driven by the rotation of the drive shaft 4 and a position retracted from the driven gear 6. 5, a plurality of (three in this embodiment) driven gears 6 arranged at positions engageable with the moving gear 5 and transmitting the driving force of the motor 1 to a predetermined driven system;
A moving gear position holding mechanism 7 for holding the moving gear 5 at an engagement position with each of the driven gears 6, and a motor 1 for meshing the moving gear 5 with any one of the driven gears 6; And a control means (CPU) 8 for controlling the moving gear position holding mechanism 7.

The motor 1 is a motor rotatable in both forward and reverse directions, and is fixed to a predetermined portion of the camera. A pinion gear 31 is provided on the output shaft. The motor 1 is
It serves as a driving source for each driven mechanism disposed in a camera to which the driving force transmission device is applied. As will be described in detail later, the motor 1 is controlled by the motor driver 81 under the control of the CPU 8.
Driven by

The motor rotation amount detecting mechanism 2 is an encoder for detecting the rotation amount of the motor 1, and is composed of a disk 22 provided integrally with an output shaft and having a hollow hole around the periphery and a photo interrupter 21. This is a known detection mechanism. The output end of the photo interrupter 21 is connected to the CPU 8 so that the CPU 8 can detect the rotation amount of the motor 1.

The driving force transmission mechanism 3 includes a pinion gear 31 of the motor 1, a known reduction mechanism 32 that engages with the pinion gear 31, and an output gear 33 that is the end of the reduction mechanism.
And is composed of By passing through the speed reduction mechanism, the motor 1 rotates at a rotation speed reduced from the rotation speed.

The drive shaft 4 is rotatably supported between bearings 42 and 43 forming a part of the camera body. One end of the drive shaft 4 extends through one of the bearings 42, and an output gear 33, which is the terminal end of the drive force transmission mechanism 3, is coaxially fixed to the end of the drive shaft 4. That is, the drive shaft 4 rotates integrally with the output gear 33 that rotates through the drive force transmission mechanism 3 by the drive force of the motor 1.

The drive shaft 4 is a column having a circular cross section in the vicinity of the bearing.
In the middle of the axis between 43, two D-cut surfaces 41 are formed so as to form a parallel surface. That is, the cross section of the shaft at the portion where the D-cut surface 41 is provided is a substantially rectangular parallelepiped. In this embodiment, the D-cut surface 41 is set to 2
Although the shaft section is formed to be a substantially rectangular parallelepiped by forming a surface, the present invention is not limited to this, and the shaft section may be formed so that the cross section has an oval shape.

The moving gear 5 is composed of a worm gear that can mesh with each of the driven gears 6 to be described later, and is slidable in the axial direction in the middle of the shaft on which the D-cut surface 41 on the driving shaft 4 is provided. In addition, it is provided so as to be integrally rotatable with the rotation of the drive shaft 4.

The driven gear 6 includes three driven gears 6 meshable with the moving gear 5, a first driven gear 61, and a second driven gear 61.
, And a third driven gear 63. Each of the three driven gears 6 is disposed so that its rotation axis is perpendicular to the axial direction of the drive shaft 4 and is arranged in parallel with the axial direction of the drive shaft 4. .

The first driven gear 61, the second driven gear 62, and the third driven gear 63 rotate coaxially and integrally with the driven gears 61, 62, 63. Are provided, respectively. These spur gears 64, 65, and 66 respectively serve as one end of a predetermined driven system, in this embodiment, a zoom driving system, a film winding driving system, and a film rewinding driving system.

On the other hand, between the arrangement of the three driven gears 6, the first driven gear 61, the second driven gear 62, and the third driven gear 63, the moving gear 5 is engaged. Moving springs 51a and 51b are provided. These moving springs 5
Each of 1a and 51b is formed of a partially arcuate spring member, and one end thereof is fixed in the camera body as a base end. Further, the other ends of the moving springs 51a and 51b are opened to form free ends. The moving springs 51a and 51b are arranged in parallel with the axial direction of the drive shaft 4.

As described above, the moving springs 51a,
The other end of the movable gear 51b is a free end. When the movable gear 5 is located between the driven gears 6 during the movement of the movable gear 5, the other end of the movable gear 5b comes into contact with the tooth space of the movable gear 5.

Here, the moving gear 5 accompanying the rotation of the drive shaft 4
The following briefly describes the moving method. As described above, the tooth profile of the moving gear 5 forms a worm gear, and the tooth profiles of the three driven gears 6 are also formed so as to mesh with the moving gear 5. Now, it is assumed that the moving gear 5 meshes with any one of the driven gears 6. When the drive shaft 4 is rotated in a predetermined direction by the motor 1, the moving gear 5 also rotates in the same direction with this rotation. The driven gear 6 rotates with the rotation of the moving gear 5. The driven gear 6
As described above, the predetermined driven system is driven by the rotation of.

When the driven gear 6 is rotated by the rotation of the moving gear 5, a force due to a reaction is applied to the teeth of the moving gear 5 which come into contact with the teeth of the driven gear 6. And
The moving gear 5 itself moves in the axial direction of the drive shaft 4 by the force of this reaction. Therefore, the moving gear 5
While transmitting power to the driven gear 6 by its rotation,
That is, while the moving gear 5 is meshed with the driven gear 6, it moves on the drive shaft 4.

The moving gear 5 that has moved on the driving shaft 4 in this manner eventually disengages from the driven gear 6. However, the driving force transmission device of the present embodiment includes the moving spring 51
a, 51b serve to promote the movement of the moving gear 5 after the disengagement of the meshing relationship. That is, the moving gear 5 moves on the drive shaft 4 in relation to the driven gear 6, and immediately before or immediately after the meshing is released, the moving spring 51a or 5b.
The distal end (free end) of 1b is in contact with a predetermined tooth space of the moving gear 5. The moving gear 5 with which the free end of the moving spring 51a or 51b abuts receives a reaction force from the moving spring 51a or 51b due to its own rotation, and meshes with the driven gear 6. Similarly, it moves on the drive shaft 4.

As described above, the moving springs 51a, 51
b is made of a spring material having one end fixed. The free end of the movable gear 5 is curved as the movable gear 5 moves, and follows the movement of the movable gear 5. This moving spring 51a, 5
The contact relationship between 1b and the moving gear 5 continues until the moving gear 5 comes into contact with the next driven gear 6.

Although the moving direction of the moving gear 5 in the axial direction differs depending on the rotation direction of the drive shaft 4,
The relationship between the moving gear 5 and the driven gear 6 and the relationship between the moving gear 5 and the moving spring 51a or 51b are the same as described above.

With the mechanism described above, the moving gear 5 moves in the axial direction on the drive shaft 4 by rotation of the drive shaft 4 driven by the motor 1 in a predetermined direction. In this embodiment, this movement is performed. It is used for switching the transmission destination of the three driven gears 6. That is, in the present embodiment, the moving gear 5
A mechanism for selecting and holding the engagement between the gear and the driven gear 6 is provided. Hereinafter, these selection and holding mechanisms will be described.

In the driving force transmission device of the present embodiment, the following three positions are set as the prescribed positions where the moving gear 5 is arranged in order to support a plurality of types of driven gears 6. That is, the moving gear 5 has a first position: a position meshing with the first driven gear 61 (initial position) a second position: a position meshing with the second driven gear 62, and a third position: a third driven. The position where the gear 63 meshes with the gear 63. The rotational position is held at any one of the above three positions.

In each of the above positions, the first position, that is, the home position (initial position) is the position closest to the driving force transmission mechanism 3, and the second and third positions are arranged in order to be further away from this.

The positions of the moving gear 5 are as follows:
It is defined by the moving gear position holding mechanism 7 (moving carrier 71 and moving carrier position control plate 72, etc.) described below.

The moving gear position holding mechanism 7 includes the drive shaft 4
And a movable carrier 71 that can move in parallel with the movable gear 5 and moves with the movement of the movable gear 5 and holds the movable gear 5 at a predetermined position (a meshing position with the driven gear 6). A moving carrier position control plate 72 that regulates the meshing position of the moving gear 5 and the driven gear 6 by restricting or releasing the movement, and a plunger mechanism 73 that controls the operation of the moving carrier position control plate 72. Make up the part.

The moving carrier 71 is movably disposed on a guide rod 71a disposed in parallel with the drive shaft 4, and has a holding arm 71b for holding the moving gear 5 from both ends in the axial direction. A position defining recess 71c with which a position defining protrusion (described later) of the position control plate 72 is engaged.

The holding arm 71b has a bifurcated arm extending from the base and sandwiches the moving gear 5 from both ends in the axial direction. The inner surface of the forked arm abuts against both end surfaces of the moving gear 5, but does not prevent the moving gear 5 from rotating, and the moving gear 5 can freely rotate. When the movement of the moving carrier 71 (movement in the axial direction of the drive shaft 4) is restricted by a method described later, the holding arm 71b is moved by the forked arm to move the moving gear 5.
Of the drive shaft 4 (movement in the axial direction of the drive shaft 4), and serves to maintain the position.

The position defining recess 71c is a notch formed between the forked arms extending from the base, and is substantially the same as the position defining projection on the movable carrier position control plate 72. Formed.

The movable carrier position control plate 72 is a strip-shaped member rotatable around a shaft 72d provided in parallel with the drive shaft 4, and has a base extending in the axial direction of the drive shaft 4. A plurality of position-defining projections (first to third position-defining projections 72A, 72B, and 72C) are provided on the side facing the moving carrier 71 from 72e.
These first to third position defining projections 72A, 72
B and 72C correspond to the first position (initial position, home position), the second position, and the third position, respectively.
1 has a shape that can be freely inserted into and removed from the position defining recess 71c. The width of each position defining protrusion (the width in the axial direction of the drive shaft 4) is formed to be slightly smaller than the width of the position defining concave portion 71c, and these position defining protrusions 72A, 72B, 72C are used for position defining. When fitted into the concave portion 71c, the movement of the movable carrier 71 (movement in the axial direction of the drive shaft 4) is regulated.

The rotation of the movable carrier position control plate 72 is directly controlled by the plunger mechanism 73. That is, the state of the plunger mechanism 73 is controlled between a normal position (horizontal position as shown in FIG. 1) and a position turned upward (for example, the states shown in FIGS. 3 and 4).

Further, the movable carrier position control plate 72 only rotates around the shaft 72d and does not move in the axial direction of the drive shaft 4.

The movable carrier 71 is restricted in the axial movement of the drive shaft 4 by fitting the respective position defining protrusions into the position defining recess 71c. On the drive shaft 4 is also restricted. That is, even if the moving gear 5 rotates together with the drive shaft 4 and the moving gear 5 itself is acted on by the force for moving on the drive shaft 4 as described above, the moving gear 5 does not move from the first to the third position. The movement is restricted by the movable carrier 71 whose movement is restricted by the protruding pieces 72A to 72C. Thus, the rotating position of the moving gear 5 is maintained.

The driving force transmission device of the present embodiment uses the operation of holding the rotational position for switching the driving force transmission position of the driven gear 6. That is, the moving carrier 7 is synchronized with the timing at which the moving gear 5 meshes with any of the driven gears 6.
1 is restricted, thereby restricting the movement of the moving gear 5 and holding it at that position. In the present embodiment, the first, second, and third position defining protrusions 72 are used.
A, 72B and 72C are the first driven gear 6 respectively.
1, formed at a position facing the second driven gear 62 and the third driven gear 63. For example, the first position defining protrusion 72 </ b> A is disposed at a position facing the first driven gear 61. Thus, at the timing when the moving gear 5 properly meshes with the first driven gear 61, the position defining projection 72A is fitted into the position defining concave portion 71c of the moving carrier 71, thereby restricting the movement of the moving carrier 71. ,
The rotating position of the moving gear 5 is maintained.

Next, a rotation control mechanism of the movable carrier position control plate 72 will be described. Moving carrier position control plate 7
At one end of the arm 2, a bifurcated arm portion 74 is vertically provided from the plate surface. On the other hand, the plunger mechanism 73 is located near the arm 74.
Is arranged. The plunger mechanism 73 is a known mechanism including a solenoid 73a and a plunger pin 73b having a coil spring (not shown). The plunger pin 73b is perpendicular to the axial direction of the drive shaft 4 by electromagnetic induction of the solenoid 73a. Move in the direction of. The solenoid 73a is connected to the plunger driver 82,
The current is supplied under the control of the PU 8.
Although not shown, the coil spring urges the plunger pin 73b toward the solenoid 73a.

A circumferential groove 73c is formed at the base end of the plunger pin 73b, and the arm 74 of the movable carrier position control plate 72 engages with the groove 73c (in the figure, the arm 74 is engaged). The plunger mechanism 73 and the arm 74 are shown separately.) That is, the arm portion 74 (moving carrier position control plate 72) rotates around the shaft 72d as the plunger pin 73b moves forward and backward.

When the plunger mechanism 73 is turned on under the control of the CPU 8, the plunger pin 73b is attracted into the solenoid 73a against the urging force of the coil spring, and the moving carrier position control plate 72 is directed upward. To rotate. On the other hand, when the plunger mechanism 73 is turned off, the plunger pin 73b is pushed outward by the urging force of the coil spring so as to retract from the solenoid 73a, and the movable carrier position control plate 72 returns to the horizontal position (normal position).

On the other end of the movable carrier position control plate 72, a protruding piece 76 for detecting a rotating state is vertically provided from the plate surface. The projecting piece 76, together with the photo interrupter 75, constitutes a rotation state detecting mechanism of the movable carrier position control plate 72, and detects the state of the movable carrier position control plate 72 rotated by the plunger mechanism 73. I have. The output end of the photo interrupter 75 is a CPU 8
And the CPU 8 recognizes the state of the moving carrier position control plate 72.

Next, with reference to FIG. 2, main electric components in the driving force transmission device of the present embodiment will be described.

FIG. 2 is a block diagram showing electrical components in the driving force transmission device of the present embodiment. Note that the camera includes various electric circuits and the like in addition to the illustrated components, but here, only the components necessary for the description of the present embodiment will be described, and description of other circuits and the like will be omitted.

The camera includes a control means (CPU) 8 for controlling the entire camera, a battery 101 as a power supply for an electric circuit and the like, and a power switch 102 for controlling ON / OFF of the CPU 8. .

As described above, the CPU 8 includes the motor driver 81 for driving the motor 1, the plunger driver 82 for driving the plunger mechanism 73, the photo interrupter 21 for detecting the rotation amount of the motor 1, and the moving carrier position control plate. Photointerrupters 75 for detecting the rotation state of 72 are connected to each other, and CPU 8 controls these circuits. The photo interrupters 21 and 7
The LED in 5 is controlled to emit light by drive transistors 103 and 104 controlled by the CPU 8.

When the power switch 102 is turned on, the CP
When power is supplied to U8, the CPU 8 starts control of various electric circuits and the like (including circuits not shown). Less than,
Main control according to the present embodiment will be described.

The CPU 8 drives the motor 1 via the motor driver 81, and detects the rotation amount of the motor 1 based on the pulse output signal from the photo interrupter 21 in the motor rotation amount detection mechanism 2. As described above, the rotation of the motor 1 drives the drive shaft 4, the moving gear 5, and the like. The CPU 8 calculates the position of the moving gear 5 (the position of the moving carrier 71) from the rotation amount of the motor 1, and The position of the moving gear 5 is controlled.

Also, when driving the predetermined driven gear 6, the CPU 8 drives the motor 1 via the motor driver 81 as necessary.

The CPU 8 also includes a plunger driver 8
2 controls the plunger mechanism 73. As described above, the movement carrier position control plate 72 is rotated by the action of the plunger mechanism 73, and controls the movement of the movement carrier 71 or the restriction cancellation. Note that this mobile carrier 7
1 and the position information of the moving gear 5 obtained as described above, together with the photointerrupter 75.
Of the movable carrier position control plate 72, which can be known from the output signal of FIG.

Next, the operation of selecting the driven gear 6 and the operation of transmitting the driving force in the driving force transmission device of the present embodiment will be described.
This will be described with reference to the flowcharts of FIGS.

FIGS. 3 to 7 are diagrams for explaining the operation of selecting the driven gear 6 and the operation of transmitting the driving force in the driving force transmitting device according to the present embodiment.
FIG. 9 is an exploded perspective view of a main part, sequentially showing the operation of the moving carrier position control plate 72. FIG. 8 is a flowchart for explaining the operation of selecting the first drive system (zoom drive system) and the operation of transmitting the drive force in the drive force transmission device of the present embodiment.
FIG. 9 shows the second drive system (drive systems other than the zoom drive system).
Is a flowchart illustrating a selection operation and a driving force transmission operation.

First, referring to the flowchart of FIG.
First drive system for selecting and driving a first drive system (zoom drive system)
Will be described below. When the first drive system is driven, the moving gear 5 is located at the first position meshing with the first driven gear 61 as described above.

As shown in FIG. 8, the CPU 8 first determines whether or not the movable carrier 71, that is, the movable gear 5 is located at the initial position (first position) (step S).
1). Now, assuming that the moving gear 5 is at the first position (initial position) where the moving gear 5 meshes with the first driven gear 61 (zoom drive system) as shown in FIG. 1, the CPU 8 proceeds from step S1 to step S2. Then, the rotation subroutine of the motor 1 is executed. In this step S2, the CP
U8 drives the motor 1 to rotate in a desired motor rotation direction.

In step S1, when the moving gear 5 is not at the first position (initial position) (for example,
When the moving gear 5 is at the second position where the moving gear 5 meshes with the second driven gear 62), the CPU 8 temporarily moves the moving gear 5
Step S3 and subsequent steps are executed to return to the first position. Now, when the moving gear 5 is in the second position as shown in FIG.
Is turned on (step S3). As a result, the plunger pin 73b is pulled into the solenoid 73a, and in conjunction with this, the movable carrier position control plate 72 rotates upward as shown in FIG. Then, the movement restriction of the mobile carrier 71 is released.

Next, the CPU 8 rotates the motor 1 in the forward direction for a predetermined time (step S4). This motor 1
The moving gear 5 moves toward the first position by the rotation in the forward direction of the moving gear 5. That is, the moving gear 5 sequentially moves from the position shown in FIG. 6 to the position shown in FIG. 5 → FIG. 4 → FIG. The predetermined time corresponds to the amount of rotation of the motor 1 required for the moving gear 5 to move from the second position to the first position. At this time, the CPU 8 detects the rotation amount of the motor 1 based on the pulse signal from the photo interrupter 21 as described above.

When the CPU 8 finishes rotating the motor 1 for a predetermined time, the moving gear 5 is located at the first position as shown in FIG. Therefore, the CPU 8
The plunger mechanism 73 is turned off to return the movable carrier position control plate 72 to the normal position (Step S5).

When the CPU 8 confirms that the moving carrier position control plate 72 has returned to the normal position (horizontal position) from the output signal PIa of the photo interrupter 75 (step S).
6) Assuming that the moving gear 5 is held at the first position, the above-described step S2, that is, the rotation subroutine of the motor 1 is executed.

Next, referring to the flowchart of FIG.
A second selection operation for selecting and driving a second drive system (a drive system other than the zoom drive system) and a drive force transmission operation will be described.
The second drive system is a film winding drive system related to the second driven gear 62 or a film rewind drive system related to the third driven gear 63.

As shown in FIG. 9, the CPU 8 first determines whether or not the moving carrier 71, that is, the moving gear 5 is located at the initial position (first position) (step S).
11). Now, it is assumed that the moving gear 5 is at the first position (initial position) as shown in FIG. The CPU 8 shifts from step S11 to step S12 in order to engage the moving gear 5 with the desired driven gear 6 (the second driven gear 62 or the third driven gear 63).

In step S12, the CPU 8 turns on the plunger mechanism 73. As a result, the plunger pin 73b is pulled into the solenoid 73a, and in conjunction with this, the movable carrier position control plate 72 rotates upward as shown in FIG. Then, the movement restriction of the mobile carrier 71 is released.

Next, the CPU 8 rotates the motor 1 in the reverse direction (step S13). By the rotation of the motor 1 in the reverse direction, the moving gear 5 moves from the first position to the second or third position. That is,
The moving gear 5 sequentially moves from the position shown in FIG. 3 to the position shown in FIG. 4 → FIG. 5 → FIG.

The CPU 8 counts the pulse signal PIb from the photo interrupter 21 and moves the moving gear 5 until the rotation amount of the motor 1 reaches a predetermined amount (step S14). The predetermined amount is a rotation amount of the motor 1 necessary for moving the moving gear 5 to the second position or the third position.

In step S14, when the motor 1 rotates a predetermined amount, the moving gear 5 is located at a desired position (here, the second position) (see FIG. 6). Then, the CPU 8 turns off the plunger mechanism 73 and returns the movable carrier position control plate 72 to the normal position (step S15).

The CPU 8 confirms that the moving carrier position control plate 72 has returned to the normal position (horizontal position) from the output signal PIa of the photo interrupter 75 (step S).
16), assuming that the moving gear 5 is held at the second position, the motor 1 is once turned off (step S17).
Thereafter, a rotation subroutine of the motor 1 is executed (step S18). That is, the CPU 8 drives the motor 1 to rotate in a desired motor rotation direction, and appropriately drives the second driven gear 62.

On the other hand, when the moving gear 5 is not at the initial position (for example, when the moving gear 5 is in the second position meshing with the second driven gear 62) in the step S11, the CPU 8 sets the moving gear 5 Are executed once to return to the first position.

Now, as shown in FIG.
Is turned on (step S21), the CPU 8 rotates the motor 1 in the forward direction for a predetermined time (step S22), and when the motor 1 finishes rotating for a predetermined time, the plunger mechanism 73 Is turned off (step S23), and after confirming that the moving carrier position control plate 72 has returned to the normal position (horizontal position) (step S24), steps S12 and subsequent steps are executed again.

When the moving gear 5 is moved to the third position (the position where the moving gear 5 meshes with the third driven gear 63), the CPU 8 performs the same control as in the flowchart shown in FIG.

As described above, in the present embodiment, the moving gear 5 is once arranged at the first position (initial position) and then moved to a desired position. However, the present invention is not limited to this. However, if the above-described technique is used, the moving gear 5 can be moved from an arbitrary position to another arbitrary position.

When the moving gear 5 is at a predetermined (desired) position, both rotations of the motor 1 can be transmitted to the driven gears 6 accurately.

As described above, according to the driving force transmission device of the present embodiment, it is possible to provide a small driving force transmission device while being able to switch between a plurality of driving force transmission destinations. it can.

[0072]

As described above, according to the present invention, it is possible to provide a small-sized driving force transmission device while being able to switch between a plurality of driving force transmission destinations.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a main configuration of a driving force transmission device according to an embodiment of the present invention, showing a state where a moving gear is at an initial position.

FIG. 2 is a block diagram showing electrical components in the driving force transmission device of the embodiment.

FIG. 3 is an exploded perspective view showing a main part configuration for explaining a driven gear selecting operation and a driving force transmission operation in the driving force transmission device of the present embodiment.

FIG. 4 is an exploded perspective view illustrating a configuration of a main part of the driving force transmission device according to the embodiment, illustrating a selection operation of a driven gear and a driving force transmission operation.

FIG. 5 is an exploded perspective view illustrating a configuration of a main part of the driving force transmission device according to the embodiment, illustrating a selection operation of a driven gear and a driving force transmission operation.

FIG. 6 is an exploded perspective view illustrating a configuration of a main part of the driving force transmission device according to the embodiment, illustrating a selection operation of a driven gear and a driving force transmission operation.

FIG. 7 is an exploded perspective view illustrating a configuration of a main part of the driving force transmission device according to the embodiment, illustrating a driven gear selection operation and a driving force transmission operation.

FIG. 8 is a flowchart illustrating a selection operation and a driving force transmission operation of a first driving system (zoom driving system) in the driving force transmission device of the present embodiment.

FIG. 9 is a flowchart illustrating a selection operation and a driving force transmission operation of a second driving system (a driving system other than a zoom driving system) in the driving force transmission device of the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Motor 2 ... Motor rotation amount detection mechanism 21 ... Photointerrupter for motor rotation number detection 3 ... Driving force transmission mechanism 31 ... Pinion gear 32 ... Reduction mechanism 33 ... Output gear 4 ... Drive shaft 5 ... Moving gear 51a, 51b ... Spring 6: driven gear 61: first driven gear 62: second driven gear 63: third driven gear 7: moving gear position holding mechanism 71: moving carrier 71a: guide rod 71b: holding Arm 71c Position-recess concave portion 72 Moving carrier position control plate 72A First position-defining projection 72B Second position-defining projection 72C Projection 73 for third position definition 73 Plunger mechanism 73a Solenoid 73b … Plunger pin 74… Arm 75… Photo interrupter for state detection 76… Protrusion piece for state detection 8… CPU 81… Plan Yadoraiba 82 ... motor driver

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G03B 17/00 G03B 17/00 J F term (reference) 2H020 MA07 MC33 MC34 2H044 DD08 DD11 3J009 DA17 EA06 EA34 EA42 EC04 FA23

Claims (4)

[Claims] 1. A driving force transmission device, comprising: a driven gear; a driving shaft for transmitting power for driving the driven gear; and a rotation of the driving shaft, whereby the driving shaft A driving force transmission device comprising: a moving gear capable of linearly moving between a position for driving a driven gear and a position retracted from the driven gear. 2. A driving force transmission device, comprising: a plurality of driven gears; a driving shaft for transmitting power for selectively driving the driven gear; A driving gear capable of linearly moving between a position for driving the driven gear and a position retracted from the driven gear. 3. A driving force transmitting device, comprising: a plurality of driven gears; a driving shaft for transmitting power for selectively driving the driven gear; A moving gear linearly movable between a position for driving the driven gear and a position retracted from the driven gear, and holding means for holding the moving gear at a predetermined position. Driving force transmission device. 4. A driving force transmitting device, comprising: a driving source; a plurality of driven gears; a driving shaft for transmitting power of the driving source for selectively driving the driven gear; and the driving shaft rotating. Thereby, on the drive shaft, a moving gear that is linearly movable between a position for driving the driven gear and a position retracted from the driven gear, holding means for holding the moving gear at a predetermined position, A driving force transmitting device, comprising: a control unit that controls the driving source and the holding unit for meshing the moving gear with any one of the driven gears.