JPH086121A - Film feeding controller - Google Patents

Abstract

PURPOSE:To reduce the cost by keeping a timer time constant in a state where a constant voltage circuit, etc., are not provided in a CR timer circuit. CONSTITUTION:In the film feeding controller winding a film by one frame by a motor 18, the CR timer circuit 63 charges a capacitor C prior to the start of the winding of a frame of the film. In such a way, a constant voltage is supplied to the capacitor C of the CR timer circuit 63 when the voltage of a power source V is stabilized, so that the timer time of the circuit 63 can be kept constant. Thus, the timer time can be kept constant in the state where the constant current circuit, etc., are not provided in the CR timer circuit 63.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film feeding control device, and more particularly to a film feeding control device for winding a film by one frame and rewinding the film by a motor.

[0002]

2. Description of the Related Art In general, a film feeding control apparatus causes a film winding motor to operate when a signal indicating that a finger is released from the shutter button is received after photographing is completed after the shutter button is pressed down with a finger to release the shutter. Drive to wind the film one frame. After the film is wound up one frame, the film winding motor is stopped to stop the automatic film winding. Then, after the photographing of the predetermined number of sheets is completed, the film is rewound on the patrone shaft. In this case, the control element for controlling the film winding motor is controlled by the electric charge supplied from the capacitor of the timer circuit.

[0003]

However, since the conventional timer circuit charges the capacitor with electric charges when the film is wound, the winding voltage of the film winding motor causes the power supply voltage for charging the capacitor to fluctuate. Therefore, since the capacitor is not charged with a constant electric charge, there is a problem that the timer time of the timer circuit is not constant. In order to prevent this problem, a constant voltage circuit or the like is provided in the timer circuit to supply a constant voltage to the capacitor. As described above, since the timer circuit is provided with the constant voltage circuit and the like, there is a problem that the cost of the film feeding control device is high.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a film feeding control apparatus capable of reducing the cost without using a constant voltage circuit or the like.

[0005]

In order to achieve the above-mentioned object, the present invention provides a film feeding controller for winding a film by one frame by a film winding motor, prior to the start of the film by one frame. A CR timer circuit for charging an electric charge in a capacitor, comprising a CR timer circuit for supplying the electric charge charged in the capacitor to a control element of the film winding motor when the film is wound.

[0006]

According to the present invention, in the film feeding control device in which the film winding motor is used to wind the film one frame, the CR timer circuit charges the capacitor prior to the start of the film one frame winding. Therefore, since the constant voltage is supplied to the capacitor of the CR timer circuit when the power supply voltage is stable, the timer time of the CR timer circuit can be kept constant.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A film feeding control device according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing the entire film feeding control device according to the present invention, FIG. 2 is a perspective view showing a state in which the respective members are assembled, and FIG. 3 is a control circuit diagram thereof.
FIG. 4 is a schematic view of the film feeding device of the camera. FIG.
As shown in FIG. 1, the case 12 of the camera 10 accommodates the cartridge 14 at the left end and the winding spool 16 at the right end.
Is supported. The winding spool 16 has gears G ₁ and G
Motor via ₂ and G ₃ (motor for film winding)
A torque is transmitted to 18 so that the torque can be transmitted.

The sun gear G ₄ is in mesh with the gear G ₂ , and the planet gear G ₅ is in mesh with the sun gear G ₄ . When the sun gear G ₄ rotates in the clockwise direction, the planet gear G ₅ revolves in the clockwise direction (arrow A direction) while rotating in the counterclockwise direction. As a result, the planet gear G ₅ is changed to the gear G ₆
, The rotational force of the planetary gear G ₅ is changed to the gears G ₇ , G ₈ ,
It is transmitted to the cartridge shaft 22 via the G ₉ , G ₁₀ and the rewinding fork 20. In this case, the cartridge shaft 22 and the winding spool 16 are rotated clockwise so that the film 24 is rewound into the cartridge 14.

On the other hand, when the sun gear G ₄ rotates counterclockwise, the planet gear G ₅ revolves in the counterclockwise direction (arrow B) while rotating in the clockwise direction. When the planet gear G ₅ revolves in the direction of the arrow B, the mesh between the planet gear G ₅ and the gear G ₆ is released, and the patrone shaft 22 becomes free.
The rotational force of the motor 18 is transmitted only to the winding spool 16 via the gears G ₁ and G ₂ . As a result, the winding spool 16 rotates counterclockwise, and the film 24 is wound on the winding spool 16 by one frame.

Further, as shown in FIG. 4, a sprocket 26 is engaged with the perforation 24A of the film 24, whereby the film 24 is wound up and unwound, so that the sprocket 26 is rotated counterclockwise and clockwise. To rotate a counter (not shown). As shown in FIGS. 1 and 2, a sprocket shaft 28 is coaxially fixed to the sprocket 26, and a charging cam 30 and a winding stop cam 32 are formed at the upper end of the sprocket shaft 28. The charging cam 30 charges the biasing force of a coil spring 52, which will be described later, in order to release the shutter. Further, a locking groove 32A is formed in the winding stop cam 32, and a first claw portion 46 described later is fitted in the locking groove 32A.

As shown in FIGS. 1 and 2, the film feeding control device 33 comprises a drive lever 34 and a locking lever 42, a coil spring 52, a lock member 53 and a control portion 62. In FIG. 2, the drive lever 34 is rotatably supported on the left side of the sprocket shaft 28 via a shaft 34A between a shutter release position and a standby position. As shown in FIG. 1, an arm 36 is formed on the drive lever 34 so as to project rightward. The tip of the arm 36 is in contact with the peripheral surface of the charging cam 30 and is used as a cam follower.

Further, the drive lever 34 has an arm 36 and an armature 90.
The spring stop portion 38 and the bent portion 39 are provided at intervals of 90 degrees, respectively.
(Structural member of the lock member 53) is formed, and one end portion 52A of the coil spring 52, which will be described later, contacts the spring stopper portion 38. Further, the drive portion 40 described above is formed on the drive lever 34 via the bent portion 39. When the drive lever 34 rotates to the shutter release position, the drive unit 40
The upper protrusion (not shown) of the shutter blade is kicked, which activates the shutter. The bent portion 39 is in contact with the engaging portion 48 of the locking lever 42 (a component of the lock member 53).

As shown in FIG. 2, the locking lever 42 has a shaft 4
It is rotatably supported between the locking position and the retracted position via 4. The aforementioned first claw portion 46 is formed on the upper end portion of the locking lever 42, and the engaging portion 48 is formed on the lower surface of the locking lever 42.
Are formed. Further, the locking lever 42 has a tubular portion 50 formed coaxially with the shaft 44, and the coil spring 5 is provided in the tubular portion 50.
2 (elastic member) is wound around. Coil spring 52
The other end 52 </ b> B is in contact with the protruding piece 54, and the protruding piece 54 is formed so as to protrude downward from the lower surface of the locking lever 42.

Thus, the other end 52 of the coil spring 52 is
B contacts the protruding piece 54 of the locking lever 42,
Since 2A is in contact with the spring stop portion 38 of the drive lever 34, the locking lever 42 is biased in the clockwise direction and the drive lever 34 is biased in the counterclockwise direction. As a result, the first claw portion 46 of the locking lever 42 is fitted into the locking groove 32A of the unwinding cam 32, and the bent portion 39 of the drive lever 34 contacts the engaging portion 48 of the locking lever 42. . A protrusion 56 is formed on the upper surface of the locking lever 42, and the film winding switch S ₀ is arranged so as to contact the protrusion 56.

On the other hand, a pin 58A is provided on the upper end of the case 12.
The shutter member 58 is swingably supported via the. The shutter member 58 is formed of an elastic member such as synthetic resin. Therefore, when a pressing force acts on the shutter button 58B, the lever portion 58C is elastically deformed and the shutter button 58B is pushed downward. Shutter button 58B
When the pressing force is released, the elastic deformation of the lever portion 58C is released and the shutter button 58B returns to the standby position before the operation. As shown in FIG. 2, a changeover switch S ₁ is provided below the shutter member 58B, and
₁ is always set to the one-frame feed position P ₂ . When the shutter member 58B is pushed down to the half-pressed position, the shutter member 58B is changeover switch S ₁ presses the changeover switch S ₁ is switched to the charging position P ₃ from one frame feed position P _2.

An operation lever 60 is formed on the shutter member 58, and a pressing portion 60A is formed at the tip of the operation lever 60. When the shutter button 58B is pushed down, the pressing portion 60A is locked by the pressing portion 60A.
The projection piece 54 is pressed by the pressing portion 60A to rotate counterclockwise around the shaft 44. As a result, the locking lever 42 rotates in the counterclockwise direction, so that the first claw portion 46 causes the locking groove 3 of the winding stop cam 32 to move.
2A, the projection 56 presses the film winding switch S ₀ . As a result, the film winding switch S ₀ is switched from the normal position P ₄ to the film winding position P ₅ (see FIG. 3).

As described above, when the locking lever 42 rotates counterclockwise, the bent portion 39 of the drive lever 34 (see FIG. 1).
(See) and the engagement portion 48 of the locking lever 42 is released, and the drive lever 34 is rotated counterclockwise by the urging force of the coil spring 52. As a result, the drive unit 40 rotates counterclockwise to kick the upper protrusion of the shutter blade (not shown) to operate the shutter.

The control unit 62 shown in FIG. 3 has a film winding switch S ₀ , a changeover switch S ₁ , a transistor Q ₁ , a transistor Q ₂ and a single frame feed / rewind changeover switch S ₂ . One frame advance in Fig. 3
The rewind changeover switch S ₂ is set to the one-frame feed position P ₁ , and the changeover switch S ₁ is set to the one-frame feed position P ₂ in the normal state. The film winding switch S ₀ is set to the normal position P ₄ .

The changeover switch S ₁ constitutes a CR timer circuit 63 together with a capacitor C and the like which will be described later. When the shutter button 58B is pressed down to the half-pressed position, the changeover switch S ₁ is switched from the one-frame feeding position P ₂ to the charging position P ₃ , the voltage of the power source V is applied to the capacitor C, and the capacitor C is charged. Also, shutter button 5
When 8B is pushed from the half-pressed position to just before the shutter release position, the locking lever 42 rotates counterclockwise against the urging force of the coil spring 52, and the film winding switch S ₀ is moved by the protrusion 56. Normal position P when pressed
Switching from ₄ to the film winding position P ₅ .

Then, the pressing force is released from the shutter button 58B pushed to the shutter release position,
When the shutter button 58B returns to the standby position, the changeover switch S ₁ is switched from the charging position P ₃ to the one-frame feeding position P ₂ . In this way, the film winding switch S ₀
Is switched from the normal position P ₄ to the film winding position P ₅ , and the changeover switch S ₁ is switched from the charging position P ₃ to the one-frame feeding position P ₂ , the electric charge charged in the capacitor C is transferred to the transistor Q ₁ . Supply base current. As a result, the transistor Q ₁ and the transistor Q
₂ is turned on, the motor 18 rotates in the forward direction, and the film 24 is fed one frame.

While the film 24 is being advanced one frame, the screen of FIG.
The charging cam 30 turns counterclockwise via the sprocket 26.
Rotate in the direction of the arrow. Thereby, the arm 3 of the drive lever 34
6 is guided by the peripheral surface of the charging cam 30 and rotates clockwise
Rotate in the direction. Bending portion 39 of drive lever 34 and locking lever
-42 is released from contact with the engaging portion 48, and the locking lever
42 is rotated clockwise by the urging force of the coil spring 52.
It Then, when the one frame advance of the film 24 is completed,
The first claw portion 46 of the locking lever 42 locks the unwinding cam 32.
Fit into the groove 32A. As a result, the locking lever 42
Film winding switch S with projection 56₀Pushing down force
Is released and the film winding switch S ₀Is normal
Setting P_FourReturn to.

When the film winding switch S ₀ returns to the normal position P ₄ , the film winding switch S ₀ is disconnected from the transistor Q _2, and at the same time the motor 18 is short-circuited and the motor 18 is braked. In FIG. 3, P ₆ of the single-frame feed / rewind switch S ₂ indicates the rewind position of the film 24, and 64 indicates the strobe section. Further, reference numeral 66 in FIG. 1 denotes an operation lever for switching the forward / reverse position of the switch S ₂ . Operating lever 66
Is positioned at a position where the spring stop portion 38 of the drive lever 34 comes into contact when the drive lever 34 is rotated to the standby position, and in this state, the switch S ₂ is set to the forward rotation position.

The operation of the film feeding control device constructed as described above will be described with reference to FIGS. FIG. 5 shows the photographing standby state, and FIGS. 6 and 10 show the changeover switch S ₁
Shows the state where the one-frame feeding position P ₂ is switched to the charging position P ₃ . 7 and 11 show a state in which the film winding switch S ₀ is switched from the normal position P ₄ to the film winding position P ₅ , and FIG. 8 shows a shutter release state. Further, FIGS. 9 and 12 show a state in which the film is advanced by one frame. Further, FIG. 13 shows a state in which the motor is braked after one frame of film is completed.

In the state shown in FIG. 5, the locking lever 42 is positioned at the locking position where it is locked to the winding stop cam 32, and the bent portion 39 of the drive lever 34 comes into contact with the engaging portion 48 of the locking lever 42 for driving. The lever 34 is locked in the standby position. Next, FIG.
When the shutter button 58B of the shutter member 58 is pushed down in order to perform shooting from this state, the shutter member 58 rotates in the counterclockwise direction (arrow direction) about the pin 58A. As a result, the shutter button 58B comes into contact with the changeover switch S _1, and the pressing portion 60 of the operating lever 60 is also contacted.
A contacts the protruding piece 54 of the locking lever 42 (see FIG. 6).

As a result, the changeover switch S ₁ is switched from the one-frame feeding position P ₂ to the charging position P ₃ , the voltage of the power source V is applied to the capacitor C, and the capacitor C is charged (see FIG. 10). On the other hand, the pressing portion 60A of the operating lever 60 rotates the protruding piece 54 of the locking lever 42 counterclockwise, and the locking lever 42 rotates counterclockwise against the biasing force of the coil spring 52. To do. As a result, the first claw portion 46 of the locking lever 42 causes the locking groove 3 of the winding stop cam 32 to move.
It rotates in the direction of retracting from within 2A.

When the shutter button 58B is pushed further downward from the state shown in FIG. 6, the pushing portion 6 of the operating lever 60 is pushed.
0A further rotates the protruding piece 54 of the locking lever 42 in the counterclockwise direction. As a result, the locking lever 42 rotates counterclockwise against the biasing force of the coil spring 52.
As a result, the film winding switch S ₀ is pressed by the protrusion 56 of the locking lever 42, and the film winding switch S ₀ is pressed.
₀ switches to the film winding position P ₅ (FIGS. 7 and 1)
1).

When the shutter button 58B is pushed down from the state shown in FIG. 7 to the shutter release state (see FIG. 8), the pressing portion 60A of the operating lever 60 causes the locking lever 42 to move.
The protruding piece 54 is rotated counterclockwise to the retracted position. As a result, the contact between the bent portion 39 of the drive lever 34 and the engagement portion 48 of the locking lever 42 is released, and the drive lever 3
4 is rotated counterclockwise by the urging force of the coil spring 52. Therefore, the driving unit 40 rotates counterclockwise to the shutter release position and kicks the upper protrusion (not shown) of the shutter blade, whereby the shutter operates and the film 24 is exposed.

In this case, the drive lever 34 is biased in the counterclockwise direction by the coil spring 52 so that the spring stop portion 38 contacts the operation lever 66 and is locked at the shutter release position. On the other hand, the locking lever 42 has a coil spring 52.
Since it is urged in the clockwise direction by, the bent portion 39 of the drive lever 34 and the engaging portion 48 of the locking lever 42 come into contact with each other and are locked in the retracted position (see FIG. 8). Therefore,
At the lock position, the first claw portion 46 of the locking lever 42 is retracted from the locking groove 32A of the winding stop cam 32.

When the pressing force applied to the shutter button 58B is released from the state shown in FIG. 8, the shutter button 58B returns to the standby position shown in FIG. 9, and the changeover switch S ₁ moves from the charging position P ₃ to the one-frame feeding position P ₂ Switch to. Thus, the charge stored in the capacitor C supplies the base current to the transistor Q _1, the transistors Q ₁ and transistor Q ₂ is the state of the respective ON, the film 24 is fed one frame motor 18 is rotated forward (See Figure 12).

As described above, since the capacitor C is charged prior to the driving of the motor 18, the capacitor C can be charged when the voltage of the power source V is stable. The capacitor C charged when the film 24 is wound up
Since the electric charge is discharged from, the fluctuation of the timer time of the CR timer circuit 63 does not occur. Therefore, since the motor 18 can be driven for a predetermined time, the film 24
It is possible to reliably perform one-frame advance, etc.

By the way, as shown in FIG.
Since the sprocket 26 rotates in the counterclockwise direction during the one-frame feeding, the charging cam 30, the winding stop cam 32
Rotates counterclockwise through the sprocket shaft 28. In this case, since the tip end of the arm 36 is in contact with the peripheral surface of the charging cam 30, when the charging cam 30 rotates counterclockwise, the arm 36 is pressed against the peripheral surface of the charging cam 30. Rotate clockwise. Then, when the charging cam 30 and the winding stop cam 32 are further rotated in the counterclockwise direction from the state of FIG. 9, the arm 36 is further rotated in the clockwise direction and locked with the bent portion 39 of the drive lever 34. The contact between the lever 42 and the engaging portion 48 is released. Therefore, the locking lever 42 is biased in the clockwise direction by the coil spring 52, so that the first claw portion 46 of the locking lever 42 comes into contact with the peripheral surface of the unwinding cam 32.

When the film 24 is fed by one frame, the charging cam 30 and the winding stop cam 32 are rotated to the position shown in FIG. 5, and the first claw portion 46 of the locking lever 42 is moved to the winding stop cam 32. It fits in the locking groove 32A. On the other hand, the drive lever 34 is rotated counterclockwise by the urging force of the coil spring 52, and the bent portion 39 of the drive lever 34 is locked by the lock lever 4.
It abuts on the second engaging portion 48. As a result, the drive lever 3
4 and the locking lever 42 are locked at the standby position and the locking position (state shown in FIG. 5), respectively.

When the first claw portion 46 of the locking lever 42 is fitted into the locking groove 32A of the winding cam 32, the pressing force of the film winding switch S ₀ by the protrusion 56 of the locking lever 42 is released. The film winding switch S ₀ returns to the normal position P ₄ . Therefore, the film winding switch S ₀ is disconnected from the transistor Q _2, and at the same time, the film winding switch S ₀ is short-circuited and the motor 18 is braked (see FIG. 13), and the one frame feeding of the film 24 is completed.

FIG. 14 is an explanatory view showing a rewinding state of the film 24. The film rewinding is performed by the operation lever 66.
By switching the switch S ₂ to the motor reverse rotation position P ₆ with, the motor 18 reversely rotates and the film 24 rewinds.

[0035]

As described above, according to the film feeding control device of the present invention, in the film feeding control device in which the film winding motor is used to wind the film one frame, the CR timer circuit is used for the film one frame. Charge the capacitor before starting winding. Therefore, since the constant voltage is supplied to the capacitor of the CR timer circuit when the power supply voltage is stable, the timer time of the CR timer circuit can be kept constant. Thus, the timer time can be kept constant without providing the CR timer circuit with a constant voltage circuit or the like, so that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an entire film feeding control device according to the present invention.

FIG. 2 is a perspective view showing a state in which each member of FIG. 1 is assembled.

FIG. 3 is a control circuit diagram of a film feeding control device according to the present invention.

FIG. 4 is a schematic view of a film feeding device of a camera.

FIG. 5 is an explanatory view for explaining the operation of the film feeding control device, and is a plan view showing a shooting standby state.

FIG. 6 is an explanatory view for explaining the operation of the film feeding control device, and is a plan view showing a state in which the changeover switch S ₁ is switched from the one-frame feeding position P ₂ to the charging position P ₃ .

FIG. 7 is an explanatory view for explaining the operation of the film feeding control device, and is a plan view showing a state in which the film winding switch S ₀ is switched from the normal position P ₄ to the film winding position P ₅ .

FIG. 8 is an explanatory view for explaining the operation of the film feeding control device, and is a plan view showing a state of shutter release.

FIG. 9 is an explanatory view for explaining the operation of the film feeding control device, and is a plan view showing a single frame feeding state of the film.

FIG. 10 is an explanatory view for explaining the operation of the film feeding control device, in which the changeover switch S ₁ is set to the one-frame feeding position P _2;
Explanatory diagram showing a state of switching from the charging position P ₃ to

FIG. 11 is an explanatory diagram for explaining the operation of the film feeding control device, showing the state in which the film winding switch S ₀ is switched from the normal position P ₄ to the film winding position P ₅ .

FIG. 12 is an explanatory diagram for explaining the operation of the film feeding control device and is an explanatory diagram showing a single-frame feeding state of the film.

FIG. 13 is an explanatory diagram for explaining the operation of the film feeding control device and is an explanatory diagram showing a state where the motor is braked.

FIG. 14 is an explanatory diagram for explaining the operation of the film feeding control device and is an explanatory diagram showing a film rewinding state.

[Explanation of symbols]

18 ... Motor (film winding motor) 24 ... Film 30 ... Charging cam 32 ... Winding stop cam 33 ... Film feeding control device 34 ... Shutter drive lever 39 ... Bending part (lock member) 42 ... Locking lever 48 ... Engagement engaging portion (lock member) 52 ... a coil spring (elastic member) 53 ... locking member 58 ... shutter button 62 ... controller 63 ... CR timer circuit S ₀ ... film winding switch (the first switch) S ₁ ... changeover switch (No. 2 of the switch) Q _1, Q ₂ ... transistor V ... power

Claims (2)

[Claims] 1. A film feeding control device for winding a film by one frame by a film winding motor, comprising a CR timer circuit in which a capacitor is charged before starting the film by one frame. For supplying the charge charged in the capacitor to the control element of the film winding motor when winding the film
A film feeding control device having a timer circuit. 2. A motor for winding a film,
Turns ON when the shutter button is pressed down to the shutter release position, and turns OFF after the film has been wound up one frame.
And a CR switch that is connected in series to the first switch and can be turned on and off, and that electrically connects the first switch and the power source in the on state, and the second switch and the capacitor. In the timer circuit, when the shutter button is pressed halfway, the second switch switches to the charging position to charge the capacitor, and when the shutter button retracts from the shutter open position, the second switch switches to the discharging position. The base current is made to flow from the capacitor to the transistor, and the transistor is turned on with a time constant that is longer than the film frame winding time.
And a CR timer circuit for controlling the film feeding control apparatus.