JPH0219932B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a winding release device for a camera winding device, and particularly to a device for releasing the winding in conjunction with a member activated in response to an exposure end signal from a shutter speed control circuit. To provide a winding release device that does not adversely affect shutter speed even if winding force is erroneously applied to a winding main shaft during exposure.

Hereinafter, the present invention will be explained based on examples.

FIG. 1 shows a schematic configuration diagram of a camera including an electromagnetic release device and an electric drive device, and FIG. 2 shows an embodiment of a winding release device for a winding device.

In FIG. 1, the electric drive unit MD is configured to be detachable from the camera body CA.

First, in the camera body CA, the electromagnetic release device MR that controls the release of the camera is equipped with a known photometry circuit, an exposure control circuit capable of responding to the output of the photometry circuit, and the exposure control circuit, although not shown here. It includes electromagnetic means whose operation is controlled by the output of the circuit. Note that the exposure control circuit may be a circuit that controls the shutter at a preset shutter speed. The power supply by the power source _E1 for the release device is controlled by a photometric switch _SW1 for operating a photometric circuit in the release device. Switch SW ₂ for operating the above release device
is configured to be activated by operating a known camera release button (not shown here).
The pluggable connector C ₁ provided on the accessory equipment unit is connected to the above switch SW ₂ .
are connected in parallel.

Next, in the electric drive unit MD, the plug _P1 can be inserted into the connector _C1 on the camera body CA side. The switch SW ₃ connected in parallel to the plug P ₁ is connected when the electric drive unit MD is attached to the camera body CA and the plug P ₁ is connected to the connector C ₁ on the camera body CA side. Switch SW ₂ on the CA side of the camera body
connected in parallel. Therefore, when this electric drive unit MD is attached to the camera body CA, the electromagnetic release device MR can be operated by switch SW ₃ on the electric drive unit MD side instead of switch SW ₂ on the camera body CA side. It becomes possible.

In the electric drive unit MD, motor 5
1 acts as a drive source when electrically driving the camera. When the electric drive unit MD is attached to the camera body CA, the drive side coupler 52 is connected to a film winding mechanism and a shutter charge mechanism provided in the camera body CA, and is connected to the gear 53 by the motor 51. The above-mentioned mechanism is actuated by being rotationally driven through a gear train consisting of 56 to 56 gears. E ₂ is the power supply for the motor 51,
SW ₅ is a power switch in the motor circuit, and 11 is a connection terminal for inputting information signals to the motor circuit in connection with operations such as film winding and shutter charging of the camera.

On the other hand, in the camera body CA, the main winding shaft 5 is connected to a driven coupler 57 that can be connected to the drive coupler 52 of the electric drive unit MD.
8 is connected to a known winding mechanism. The shutter curtain winding drum 59 is connected to the winding main shaft 58 via a gear train consisting of gears 60 to 63. Switch SW ₄ and SW ₆ are connected in parallel,
Both of them work together to control on and off in response to shutter release and charge, and the motor is turned on only from the end of the shutter curtain run until the shutter charge is completed, that is, only while the camera is in the winding phase. It is arranged to turn on the power supply circuit. The connection terminal _t2 is connected to the switches _SW4 and _SW6 , and when the electric drive unit MD is attached to the camera body CA, it is connected to the terminal _t1 on the side of the electric drive unit MD to connect the above switch.
Input the SW ₆ on/off signal to the motor circuit.

Next, the operation of the camera system having the above configuration during photographing will be explained.

Attach the electric drive unit MD to the camera body CA, connect its plug P ₁ to the connector C ₁ , connect the drive side coupler 52 to the driven side coupler 57, and connect the terminal t ₁ to the terminal t _2. Then turn on the photometry switch SW ₁ on the camera body CA side and the power switch SW ₅ in the motor circuit on the electric drive unit MD side.

Now, assuming that the camera body CA side has just completed shooting preparation operations such as film winding and shutter charging, the camera body
Switches SW ₄ and SW ₆ on the CA side are turned off,
Motor 51 is therefore at rest because its circuit is not closed.

In this state, when either the first operation switch SW ₂ on the camera body CA side or the second operation switch SW ₃ on the electric drive unit MD side is turned on, these switches SW ₂ and SW ₃ are connected to each other. Since they are in a parallel relationship, when either switch is turned on, the electromagnetic release device MR is activated in the same way, and the shutter is released by electromagnetic control.

When the shutter release is performed and the shutter curtain runs, the shutter curtain take-up drum 59 rotates in the opposite direction to that during shutter charge. The switch SW ₄ is turned on just when the shutter curtain has finished running, that is, when the exposure of the film has finished. Based on this,
On the electric drive unit MD side, the motor circuit is closed, so the motor 51 is activated, and its driving force is transmitted to the winding shaft 58 on the camera body CA side via gears 53 to 56 and couplers 52, 57. The rotation of the main shaft 58 causes film winding and shutter charging in a known manner. switch during charging
SW ₆ is turned on, and after this switch SW ₆ is turned on, switch SW ₄ is turned off. Then, when the film winding and shutter charging are completed, switch SW ₆ is turned off as described above, so that the motor 51 is turned off. The circuit is opened and stopped.

Therefore, the first and second operation switches
As long as either SW ₂ or SW ₃ is kept on, shooting will be repeated, and when the switch is released, the next shutter release will be blocked, so the camera body CA and the electric drive unit MD are always in the process of releasing the film. The camera will stop when winding and charging of the shutter are completed, that is, when preparations for shooting are completed.

The hoisting lever 1 transmits the hoisting force to the axle 3 via a one-way clutch (not shown) located between the axles 2 and 3. A first hoisting gear 4 is attached to the shaft 3. The second hoisting gear 5 is attached to the hoisting shaft 8. The shutter charge gear 6 is in a position where it can mesh with the shutter gear 7. Each element of the shutter is interlocked with gear 7 and below, but it is not shown because it is known per se.

The stop cam 9 is also attached to the hoisting shaft 8. The hoisting completion signal cam 10 is attached to the hoisting shaft 8 together with a coupling 57 below it. The stopper claw 12 has arms 12a to 12d. The arm 12a is used to stop the winding, and the winding stop cam 9
It engages with the protrusion 9a of. The arm 12b is in a position where it is pushed by the protrusion 9a of the winding stop cam 9 in order to set the winding stop claw at the winding stop position. arm 12
c can be locked by a notch 20a of the pawl 20 in order to hold the pawl 12 at the unwinding position. Arm 12d is spring pin 13
and the shutter trailing curtain signal pin 16 is installed. The spring 14 generates a tensile force between the pin 15 and the pin 13 fixed to the camera body, and urges the stopper claw 12 to rotate counterclockwise. Contact 1
7 and spring 18 constitute the aforementioned switch SW ₄ . Further, the spring 18 is connected to the shutter trailing curtain signal pin 16.
and pin 19.

The retaining pawl 20 is supported by a shaft 21, and the notch 2
The arm 12c of the stopper claw 12 is locked at 0a, and the tip 20b can come into contact with the pin 24a of the shutter rear curtain claw 24. This tip 20b and pin 2
4a means a predetermined gap (gap) when winding is completed.
It is located with. Spring 23 is pawl 2
0 clockwise.

The shutter rear curtain pawl 24 is rotatable around a shaft 25 and biased clockwise by a spring 27 via a pin 28. However, when the coil 31 is energized, the armature 29 and yoke 30
It is held in the position shown by the suction action of. This coil 31, yoke, and armature 29 constitute an electromagnet for controlling the shutter trailing curtain.

The drum 59 is rotatably supported on the shaft 34. A shutter trailing curtain (not shown) is wrapped around a drum 59. The drum 59 is biased clockwise by a drive spring (not shown). The shutter trailing curtain pin 32 fixed to the drum 59 can engage with one end 24b of the shutter trailing curtain pawl 24, and the activation and running of the shutter trailing curtain is controlled by switching on/off this engagement. The release push button 35 has a release shaft 36
is installed. Contact pieces 37 and 38 are switches
It constitutes SW ₂ . Since this embodiment is an example of a so-called electromagnetic release, the shaft 36 is the contact piece 3 of the switch SW ₂ .
It's like pressing 7. A locking portion 37a formed by bending the contact piece 37 engages with the arm 12c when the contact pieces 37 and 38 are in contact with each other, and the stopper claw 1
It has the role of preventing counterclockwise rotation of 2.

The winding completion signal lever 39 is supported by a shaft 40. A pin 41 provided on the winding completion signal lever 39 is in contact with a contact piece 42, thereby controlling the contact between the contact pieces 42 and 43. Contact piece 4
2 and 43 constitute a switch SW ₆ which generates a camera winding completion signal.

Next, the operation of this embodiment will be explained separately for the case where the release trigger is performed on the camera body side, and the case where the camera and an electric drive device are combined and the release trigger is performed on the electric drive device side.

(1) Operation when triggering the release from the camera body side; In Figure 2, which shows the winding completed state, when the release push button 35 is pushed down, the release shaft 36 also lowers and the contact piece 37 is pushed, and the contact pieces 38 and 37 come into contact. do. Therefore, switch SW ₂ is turned on and the electromagnetic release device starts the shutter front curtain. The exposure control circuit cuts off the current flowing through the coil 31 after the required shutter time has elapsed. Therefore, armature 29 and yoke 3
0 disappears, and the shutter rear curtain pawl 24 begins to rotate clockwise due to the biasing force of the spring 27. After the pin 24a rotates to a certain extent and the rotational speed increases, the pin 24a touches the tip 20b of the pawl 20.
Press. At this time, the engagement between the shutter trailing curtain pin 32 and the one end 24b of the shutter trailing curtain claw 24 is approximately half or more removed, or is completely disengaged. The retaining pawl 20 is secured to the arm 12 by the action of the pin 24a.
c and the notch 20a are disengaged. Therefore, due to the action of the spring 14, it tries to rotate counterclockwise. However, the stopper claw 12 is prevented from rotating by the locking portion 37a of the contact piece 37. This eliminates the inconvenience that would occur if a photograph was taken while the winding force was applied to the winding lever 1 by mistake.

That is, this prevents the inconvenience that if the arm 12a of the wind stopper pawl 12 and the wind stop cam 9 are disengaged when the rear curtain of the shutter starts, the next film winding will start during photography. Furthermore, it also has the function of preventing the next winding operation even if the push button is held down after shooting. Without this function, if the push button is kept pressed, the next release will be performed inadvertently at the same time as winding is completed.

After the shutter rear curtain pin 32 and one end 24b of the shutter rear curtain pawl 24 are disengaged by more than half, the pin 24a locks the stopper pawl 20 into the spring 23.
Move counterclockwise against the Here pin 24a
The reason why a gap is provided between the tip 20b of the retaining claw 20 and the tip 20b of the retaining claw 20 will be explained below. If there is no gap, if the winding lever 1 is erroneously placed and a force is applied in the winding direction, the protrusion of the winding stop cam 9 and the arm 12a
Pressure is generated between the spring 1 and the friction force.
Reduces the power of 4. Therefore, the pressure between the arm 12c and the notch 20a is reduced. At this time, the force required by the pin 24c to rotate the locking pawl 20 in the counterclockwise direction is small, so the clockwise rotation speed of the shutter rear curtain pawl 24 increases, and the coil 31 is rotated at a predetermined time. Even if you cut off the power to the shutter, the shutter time will become shorter. In other words, the running speed of the shutter trailing curtain pawl 24 becomes uneven.
In order to prevent this, the pin 24a and the tip 20b should be brought into contact after the engagement between the shutter rear curtain pin 32 and one end 24b of the shutter rear curtain claw is disengaged, or the shutter rear curtain claw 24 may be brought into contact with the pin 24a even if the engagement is not disengaged. If the pin 24a has a certain amount of kinetic energy, the change in the rotational force of the stopper claw 20 in the counterclockwise direction can be virtually ignored.
A gap is provided between the tip 20b and the tip 20b.

In this way, the arm 12c and the notch 20a
However, this state will continue unless the pressure on the release button 35 is released.

Now, when the release of the release push button 35 is released after photographing, the engagement between the locking portion 37a and the arm 12c is released. Therefore, the winding stopper claw 12 rotates counterclockwise, and after the arm 12a and the winding stopper cam 9 are disengaged, the spring 18 and the contact point 17 come into contact. Therefore, the switch SW ₄ is turned on and generates a signal indicating that shooting has been completed and the next winding is possible. This occurs at time T ₁ in FIG. This timing can be set by adjusting the distance between the spring 18 and the contact 17.

Winding is performed by an electric winding device via the winding lever 1 or the coupling ring 57.
When using the camera alone, use winding lever 1. When the winding lever 1 is operated in the direction of the arrow, shafts 2 and 3
The first hoisting gear 4 is rotated counterclockwise through a one-way clutch (not shown) between the first hoisting gear 4 and the second hoisting gear 5 that meshes with it is rotated one rotation clockwise. As a result, the winding completion signal cam 10 also rotates counterclockwise via the shaft 8. During this rotation, the lever 39 is rotated counterclockwise by the cam 10, so that the pin 41 brings the contact pieces 42 and 43 into contact. Therefore, switch SW ₆ is turned on. This is a phenomenon that occurs at time _T2 in FIG.
Since the gear 5 rotates the winding shaft 8 once, the shutter gear 7 is charged by the shutter charge gear 6, and the shutter leading curtain system (not shown) returns to the winding complete position, and the shutter trailing curtain drum 59 also moves to the shutter trailing curtain pin 32. returns to the position shown in the second figure.

Also, since the protrusion of the winding stop cam 9 pushes the arm 12b away clockwise and rotates once, the winding stopper claw 12
rotates clockwise. Therefore, the signal pin 16 pushes the spring 18 in the energy storage direction, and as a result, the contact 1
The contact between 7 and the spring 18 is broken and the switch SW ₄ is turned off. This occurs at time _T3 in FIG. arm 1
2c also returns to the position where it is locked at the notch 20a of the locking claw 20. However, the shutter rear curtain pawl 24 is returned to a position where the armature 29 and the yoke 30 are in contact with each other by a restoring mechanism (not shown).

When the winding shaft 8 completes one positive rotation, the winding completion signal lever 39 falls into the recess of the winding completion signal cam 10. As a result, the contact pieces 42 and 43 are separated and the switch SW ₆ is turned off. This is the time shown in Figure 3.
Occurs at T ₄ .

On the other hand, when the electric drive device MD is attached to the camera body CA and winding is performed by the electric drive device, the operation is as follows. The operation of the mechanical system at this time depends on whether the shaft 8 is rotated by the winding lever 1 or by the motor 51. Since the process is the same as described above until the shooting is finished, the explanation will be omitted. Now, after shooting is finished and the release push button 35 is released, switches SW ₄ and SW ₆ operate as shown in FIG. 3, so the power supply circuit of the motor 51 is closed between time T ₁ and time T ₂ . will be accomplished. Of course, power switch SW ₅ is turned on. Therefore, the motor 5 is turned on by turning on the switch SW ₄ , which indicates the completion of photographing.
1 rotates and rotates the gear 6 via the coupling ring 57 to perform shutter charging and film winding. When the winding is completed and the switch SW ₆ is turned off, the power supply to the motor 51 is cut off and the motor 51 stops rotating. Therefore, when using the electric drive device MD, the operation from shutter release to shooting is completed by pressing the release push button 35, and the winding operation is started by releasing the push button 35. This is repeated by repeatedly pressing and releasing the pressure.

The above is the operation when the release is triggered by the release push button 35 of the camera to take a picture, and the film is wound using the winding lever 1 or the electric winding device MD.

(2) Operation when triggering the release on the electric drive device MD side; At this time, the release push button 35 on the camera body CA side is not used (not pressed), so the bent part 37a of the contact piece 37 of the switch SW ₂ is connected to the arm 12a. It has evacuated outside the rotating orbit. Therefore, when the release push button 46 on the electric drive device side is pressed and the switch SW ₃ is turned on in the winding completion state shown in the second figure, the shutter leading curtain is moved by the electromagnetic release device MR as described above. After that, when the exposure control circuit finishes counting the exposure time, the coil 31
energization is cut off, and the lever 24 rotates clockwise. As a result, the stopper claw 20 is rotated counterclockwise against the spring 23. At this time, since the bent portion 37a is outside the orbit of the arm 12a, the stopper claw 12 is immediately rotated counterclockwise by the spring 14. Rotate to . Therefore, the arm 12a releases the locking of the winding cam 9, and then the spring 18 and the contact 17 come into contact and the switch is turned on.
Turn on SW ₄ . That is, immediately after the trailing shutter curtain starts running, the switch _SW4 is turned on and a winding signal is generated.

When the switch SW ₄ is turned on, power is supplied to the motor 51, but there is a certain time delay before it actually rotates and rotates the coupling 57. This is due to the delay in starting the motor 51 and the rotation of the motor due to gears 53 to 56.
and the time required for the signal to be transmitted to the coupling 57. It is sufficient to set this certain time delay to be larger than the time required for the shutter trailing curtain to complete its travel through the aperture. Incidentally, if the motor 51 has good starting characteristics and starts up very quickly, it is also possible to use a delay circuit that forms the predetermined period of time between when the switch SW ₄ is turned on and when power is supplied to the motor 51. In this way, the electric drive device MD starts winding after the shutter trailing curtain completes running.

FIG. 4 is a timing chart showing the running (movement) characteristics of this shutter curtain. In Fig. 4, curve a shows the running characteristics of the leading shutter curtain after the shutter is released, curve b shows the running characteristics of the trailing shutter curtain activated by the exposure control circuit, and curve c shows the running characteristics of the leading shutter curtain after winding. The movement characteristics are shown respectively. In this figure, the time Tx from the start of running of the rear shutter curtain to the time of completion of running of the rear shutter corresponds to the above-mentioned fixed delay time.

Curve c' shows the shutter curtain movement characteristic when winding is performed after the shutter trailing curtain has completed running as in the conventional case.
Now, when considering the sum of the time from release to the completion of shooting (the completion of running of the shutter rear curtain) and the winding time, it is Ta in this embodiment and Tb in the prior art. If Ta and Tb are one cycle of operation of the camera and electric drive device, then the period is Ta<Tb
Therefore, it can be understood that in this embodiment, when the switch SW ₃ is kept on and continuous shooting is performed, the frame speed becomes extremely fast.

In the above embodiment, the element 9 is a hoisting interlocking member,
Element 12 constitutes a winding member, element 14 constitutes a biasing member, element 20 constitutes a locking member, and elements 24 and 24a constitute a release member.

As detailed above, according to the present invention, the release member 2
4 and 24a have traveled a certain distance, the locking member 20
Since the engagement between the locking member 20 and the winding member 12 is released, the locking member 20 can be driven with the release members 24, 24a having a certain amount of kinetic energy. Therefore, the release members 24, 24a
The movement of the shutter is not affected much by the magnitude of the frictional force between the locking member 20 and the winding stopper 12, and even if the release member releases the lock of the shutter rear curtain, the timing of releasing the lock of the shutter rear curtain does not change. It does not change significantly. In other words, even if a hoisting force is applied to the hoisting interlocking member due to the operation of the hoisting lever, etc., it is possible to suppress variations in the timing of shutter rear curtain release (shutter seconds) as much as possible. can.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a camera including an electromagnetic release device and an electric drive device, FIG. 2 is a diagram showing an embodiment of a winding release device for a winding device according to the present invention, and FIG. The operation timing chart of the switches SW ₄ and SW ₆ is shown in the figure, and FIG. 4 is a shutter movement characteristic diagram. Explanation of the symbols of the main parts: winding cam...9, winding member...12, locking member...20, release member...24, 24a, biasing member...14.

Claims (1)

[Claims] 1. A winding interlocking member that interlocks with the film winding operation, and a winding stop that is movable between a first position for locking the winding interlocking member and a second position for releasing the locking. A winding device for a camera winding device, which locks the film winding operation when the winding of one frame of film is completed by the winding member moved from the second position to the first position. a biasing member that urges the winding member to move from the first position to the second position; a third position that engages with the winding member and locks the winding member in the first position; a locking member movable between a fourth position in which engagement with the stopper member is released and the winding stopper member is allowed to move to a second position by the biasing member; A shutter time control circuit that generates an exposure end signal for running the shutter; and a shutter time control circuit that is driven in response to the exposure end signal from the shutter time control circuit, and after moving a certain distance, hits the locking member at the third position. a release member that contacts and moves the locking member to a fourth position, the release member moving the locking member from the third position to the fourth position;
by moving the winding member to the first position.
What is claimed is: 1. A winding release device, characterized in that it is configured to permit movement from one position to a second position, and to cause a shutter trailing curtain to start running by movement of the release member.