JPH0259448B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric winding camera that winds and rewinds a film using a motor. This relates to a camera that has been improved to stop.

In an electric winding camera, the frame advance switch is turned on in conjunction with the shutter release, and while the frame advance switch is on, the motor rotates forward to wind the film one frame, and then the rewind button is pressed. When pressed or when it is detected that the film has stopped running, the motor automatically reverses and rewinds the film. The frame feed switch is for detecting that a certain amount of film has been transferred, and is designed to be linked with a shutter setting mechanism so that film feeding and shutter setting are carried out in a certain sequence. It's summery. When rewinding the film, the shutter is not set in order to eliminate excess load, so the frame advance switch does not operate. Generally, film rewinding is performed when the film can no longer be pulled out from the cartridge, and in most cases this occurs during winding, so the frame advance switch is left in the on position. Become. In this case, since the frame advance switch is used as a power switch for the motor, the motor control circuit remains energized even when rewinding is completed and the motor is stopped.

In order to prevent the frame feed switch from remaining on when the motor stops in reverse rotation, the shutter setting mechanism is converted to normal rotation at the end of the motor reversal period, and the shutter is set and the frame feed switch is turned on. Some cameras are designed to stop the motor from reversing when the switch is turned off. This camera has a driven sprocket that is rotated by engaging the perforation of the film, and is adapted to set the shutter with the driven sprocket. During film rewinding, the driven sprocket slides to the rewinding position under the tension of the film and disconnects from the shutter, so the shutter is not set and the frame advance switch is not operated. When the rewinding of the film is almost completed, the film is removed from the driven sprocket, which returns to the neutral position and acts to transmit the rotational force of the motor to the shutter via one idle gear. Therefore, although the motor is reversing,
The shutter setting mechanism enters the normal rotation state and sets the shutter. Thereafter, when the frame feed switch is turned off, the motor stops rotating in reverse. However, in this camera, in addition to being used as a power source for the shutter, the driven sprocket also detects the slight load on the film, connects the winding system and shutter when no film is loaded, and also connects the shutter to the winding system. In the final stage, it is used as a clutch to connect the rewinding system and the shutter, so it has a complicated structure and requires high-precision machining and adjustment.

The present invention solves the above-mentioned drawbacks and provides an electric winding camera in which the motor is rotated in the forward direction after rewinding is completed, and the motor is stopped with the frame advance switch turned off.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows the camera mechanism, with solid lines indicating normal rotation of the motor and dotted lines indicating reverse rotation. During winding, the motor 1 rotates in the normal direction and rotates the take-up reel 3 via the friction clutch 2. at the same time,
The drive sprocket 5 is rotated via the normal rotation clutch 4 to transport the film. The rotation of the drive sprocket 5 is transmitted to a shutter set cam 6 that sets the shutter, and a control cam 7 that rotates in conjunction with the shutter set cam 6 and controls the on/off of the frame advance switch. Ru. Further, the rotation of the drive sprocket 5 is transmitted to the film counter 8, which rotates the scale plate one pitch each time the film is transferred by one frame.

When rewinding the film, the motor 1 rotates in the reverse direction, rotates the take-up reel 3 in the opposite direction, and rotates the cartridge 12 via the reversing clutch 9, friction clutch 10, and rewind shaft 11, so that the film is transferred to the cartridge 12. You can rewind it inside. Further, during this rewinding, since the drive sprocket 5, which is separated from the motor 1, rotates in reverse as the film is transferred, the shutter set cam, control cam 7, and film counter 8 also rotate in reverse.

FIG. 2 shows the rotation of the motor during rewinding. By pressing the rewind button or by detecting that the film transport has stopped, the motor 1 is reversely rotated to rewind the film. Then, while the first frame of the film is being rewound from the photographing position into the cartridge 12, the counter 8 is prevented from reversing, but the film is rewound as it is. When this film rewinding is completed, a normal rotation circuit for the motor 1 is automatically formed, and the motor 1 rotates in the normal direction until the frame feed switch is turned off.

When the back cover is opened to take out the cartridge 12, the film counter 8 is unlocked and the scale plate returns to the starting frame "S". When you close the camera back after loading a new film, motor 1 automatically rotates forward and transfers the three frames to take-up reel 3.
The motor 1 stops when the first frame is set at the photographing position. After this, each time the shutter button is pressed and the shutter is released, the motor rotates and winds up the film one frame at a time.

FIG. 3 shows the film counter and shutter setting mechanism. A gear 21 is attached to the upper end of the sprocket shaft 20, and the gear 21 rotates together with the drive sprocket 5. This gear 2
1 is transmitted to the gear 23 via the gear 22, and rotates the intermittent feed shaft 24 provided integrally with the gear 23. These gears 22 and 23 are supported by a counter feed lever 25 that pivots about the sprocket shaft 20 as a fulcrum.

The intermittent feed shaft 24 has a V-shaped notch that meshes with the ratchet wheel 26 so that the ratchet wheel 26 can be rotated by one tooth with one revolution of the intermittent feed shaft 24. This ratchet wheel 26 is a return spring 27
When the scale plate 29 is rotated one pitch at a time against this, the scale plate 29 connected via the shaft 28 also rotates, and the number of frames to be photographed is displayed from the scale corresponding to the index 30.

On the lower surface of the ratchet wheel 26, there is a switch S1 for empty feed,
Sliding brushes 32 and 33 of S2 are attached and move together with the ratchet wheel 26. Sliding brush 32
contacts the contact 35a and the common contact 35b on the substrate 34, and the sliding brush 33 contacts the common contact 35b and the contact 35C. This dry feed switch S1,
S2 is turned on in the middle section of winding from the start frame "S" to the first frame being transferred to the photographing position.

In order to lock the film counter 8 while returning the first frame to the cartridge, a non-return pawl 3 is attached to the scale plate 29.
7 is provided, and this non-return claw 37 is connected to the pin 38.
It is becoming more and more engaged. The reason why the film counter 8 is locked in the middle is that in order to turn off the frame advance switch, it is sufficient to rotate the motor 1 in the forward direction by one frame after the rewind is completed, but in this embodiment, Since the jump feed switches S1 and S2 are connected in parallel with the frame feed switch, when the film counter 8 returns to the start frame "S", the motor 1 rotates forward until three frames have been transferred. This is because this results in a waste of battery power.

The locking lever 39 to which the pin 38 is attached is
It comes into contact with the vertical piece 40a of the counter return lever 40, and a spring 41 is hung between them. The counter return lever 40 is linked to the back cover of the camera, is pushed in the direction of the arrow when the back cover is closed, rotates counterclockwise against the spring 42, and turns on the back cover switch S3. At the same time, the pin 38 moves so as to come into contact with the outer periphery of the scale plate 29. Conversely, when the back cover is opened, the shaft 43
Rotate the lock lever 39 clockwise around , remove the pin 38 from the check claw 37, and turn off the back cover switch S3.

The counter return lever 40 and the counter feed lever 25 are connected by a spring 44, and when the back cover is closed, the counter feed lever 25 rotates counterclockwise about the sprocket shaft 20, and the counter feed lever 25 rotates intermittently. The feed shaft 24 is engaged with the ratchet wheel 26.
Conversely, when the back cover is opened, the counter feed lever 25 rotates clockwise and the intermittent feed shaft 24 and ratchet wheel 26 are disengaged. Note that when the check claw 37 and the pin 38 are engaged to prevent rotation of the scale plate 29, the counter feed lever 25 rotates clockwise to release the intermittent feed shaft 24 from the ratchet wheel 26. Can be done.

The shutter set cam 6 and the control cam 7 are connected to a rotating shaft 47 that rotates in conjunction with the sprocket shaft 20.
is fixed to. A control lever 48 that detects the amount of rotation of the control cam 7 is pivotally supported by a shaft 49, and when winding is completed, a protrusion 48a provided on a part of the lever 48 receives the tensile force of a spring 50, and the control cam 7
At the same time, the frame advance switch S4 is turned off.

A lever 52 pivotally supported by a shutter set lever 51 is in contact with the shutter set cam 6.
When the shutter set cam 6 rotates in the direction shown by the solid line during winding, the shutter set lever 51 is swung once about the shaft 49. During rewinding, the shutter set cam 6 is rotated in the direction of the dotted line as the film is transferred, but in this case, the lever 52 is rotated clockwise and the pin 5 is rotated.
3, the shutter set lever 51 is not pushed by the shutter set cam 6. When the shutter set lever 51 rotates counterclockwise, its free end is connected to the shutter drive lever 54.
Push the vertical piece 54a to move it to the right. When the shutter drive lever 54 moves to the right against the spring 55, the pin 56 is locked to the shutter release lever 57.

After setting the shutter, when the release lever 58 is pressed, the shutter release lever 57 is rotated clockwise by the pin 59, releasing the lock of the shutter drive lever 54, and at the same time
Turn on 5. The shutter is activated when the shutter drive lever 54 moves to the left toward the charge release position. This shutter drive lever 54
Just before returning to the charge release position, control lever 4
Press the free end of 8 and rotate it clockwise to turn on the frame advance switch S4. Therefore, after the shutter is activated, the frame advance switch S4
is turned on, the motor 1 rotates forward to wind the film and set the shutter. Since the frame advance switch S4 is turned off immediately after the shutter is set, the control lever 48 will not collide with the shutter drive lever 54 during winding. Further, while the film is being rewound, the shutter is not set even if the shutter cam 6 rotates in the direction of the dotted line, so the frame advance switch S4 remains on.

FIG. 4 shows the motor control device. When forward rotation relay switch S6 is connected to contact a and reverse rotation relay switch S7 is connected to contact b, motor 1 is connected to power supply 70,
The film is wound onto the take-up reel 3 by rotating in the direction shown by the solid line. Conversely, forward rotation relay switch S6
is connected to contact b, and when reverse relay switch S7 is connected to contact a, motor 1 rotates in the direction shown by the dotted line to rewind the film onto cartridge 13.

The frame-feeding switch S4 and the jump-feeding switch S1 are connected in parallel.
It is designed so that it can be wound continuously even if it is turned off. A back cover switch S3 is connected in series with these switches S1 and S4, and the motor 1 does not rotate forward when the back cover is open.

A CR circuit consisting of a resistor 71 and a capacitor 72 is connected between the frame advance switch S4 and the connection point P. The + side input terminal of the comparator 73 is connected to the connection point A between the resistor 71 and the capacitor 72. A negative input terminal of this comparator 73 is connected to a connection point B between resistors 74 and 75. These electrical components constitute a forward rotation timer circuit that measures a time t1 that is longer than the time T required to wind up one frame of film (see FIG. 5). This forward rotation timer circuit is
When it becomes impossible to pull out the film from the cartridge, and the frame feed switch S4 is kept in the on state, and a time t1 longer than the time T required to wind one frame has elapsed, the comparator 73 outputs is reversed from "L" to "H". The output terminal of this comparator 73 is connected to a forward rotation relay coil (hereinafter simply referred to as a forward rotation relay).
76 is connected, and is energized when the output terminal of the comparator 73 is "L", switching the forward rotation relay switch S6 from contact b to contact a. Note that when the forward rotation relay 76 is not energized, the forward rotation relay switch S6 is connected to contact b. The charge in the capacitor 72 is transferred to a switch S that is turned on when the release lever 58 is pressed down.
5.

A capacitor 77 and a resistor 78 are connected in series between the connection point Q and the frame advance switch S4. The connection point between the capacitor 77 and the resistor 78 is connected to the + side input terminal of the comparator 79, and the connection point between the resistors 80 and 81 is connected to the - side input terminal. This forward/reverse switching timer circuit is designed to prevent the forward rotation relay 76 and the reverse rotation relay coil (hereinafter simply referred to as the reverse rotation relay) 82 from being energized at the same time. It is activated when switch S4 is turned on, and delays the time for the output terminal of comparator 79 to reverse from "H" to "L" by a time sufficient for forward rotation relay switch S6 to switch from contact a to contact b. be. In this case, when forward rotation relay switch S6 connects to contact a,
Since the forward/reverse switching timer circuit becomes inactive, the output terminal of the comparator 79 remains at "H".
This also operates when the forward rotation relay switch S6 leaves contact a and switches to contact b in order to rewind the film, and comparator 79
delay. After this delay, the output terminal of the comparator 79 is set to "L" and the reverse relay coil 82
Turn on the power and switch the reversing relay switch S7 to contact a.

A transistor 83 is connected in parallel with the capacitor 77.
is connected, and this base is connected to a reverse relay switch S7. This transistor 83 is turned on when the reverse relay switch S7 is connected to contact b, and turned off when it is connected to contact a, and even if the frame feed switch S4 is turned on while the motor 1 is reversing. This is to prevent the output terminal of the comparator 79 from becoming "L".

A connection point C between the resistor 84 and the capacitor 85 is connected to the + side input terminal of the comparator 86.
A connection point D between 7 and 88 is connected to the negative input terminal. This reversal timer circuit is activated when the reversing relay switch S7 is connected to contact a to form a reversing circuit for the motor 1, and the capacitor 85
is continuously charged and the voltage at connection point C becomes connection point D.
The output terminal of the comparator 86 is set to "L" only during the time the voltage rises to the voltage . Note that this time is desirably set to be relatively long in order to completely wrap the leading edge of the film into the cartridge.

A transistor 89 is connected in parallel with the capacitor 85.
is connected, and is turned on by a pulse signal from the differentiating circuit 90 to reset the reversal timer circuit during film rewinding. As this differentiating circuit 90,
For example, a one-shot multivibrator is used, and is activated to output a pulse signal at the falling edge of the film transport signal generated from the film transport detection switch S8. The film transport detection switch S8 is provided with a driven sprocket that is rotated by engaging with the perforation of the film, and is turned on and off by a pin provided on the driven sprocket. Further, a lamp 91 is connected to the output terminal of the differential circuit 90, and blinks while the film is being transferred.

The comparators 79 and 86 are open collectors, and when either one is "L", the reversing relay 82 is energized. Comparator 79
is used to regulate the start of energization of the reversing relay 82, and the comparator 86 is used thereafter to act to reverse the motor 1 and rewind the film into the cartridge.

The switch S9 is a rewinding switch, and is used to rewind a film from the middle. When the rewinding switch S9 is turned on and the reversing relay 82 is energized, the reversing timer circuit is activated, so the motor 1 is continuously reversed even if the rewinding switch S9 is not kept pressed.

FIG. 5 shows a timing chart during winding. When rewinding is completed, the film counter 8 is displaying the first frame. When the back cover is opened, the counter return lever 40 rotates clockwise under the tension of the spring 42, and the intermittent feed shaft 24 is removed from the ratchet wheel 26. At the same time, the locking lever 39
rotates clockwise, and the pin 38 is retracted so that it does not engage with the check pawl 37. As a result, the ratchet wheel 26
Then, the scale plate 29 rotates counterclockwise under the tension of the spring 27, and the start piece "S" coincides with the index 30.

If you load a new cartridge while the back cover is open and then close the back cover, the counter return lever 40
is pushed in the direction of the arrow by a part of the back cover. The intermittent feed shaft 24 meshes with the ratchet wheel 26, and the back cover switch S3 is turned on.

Since the jump feed switches S1 and S2 linked to the film counter 8 are turned on from the start frame "S" until the middle of transporting the first frame to the photographing position,
When back cover switch S3 is turned on, comparator 7
The output terminal of No. 3 becomes "L". Forward rotation relay 76
is energized, and the forward rotation relay switch S6 is connected to contact b.
Switch from to contact a. On the other hand, the reversing relay 8
2 is cut off, the reverse relay switch S7 remains connected to contact b.

When the motor 1 rotates forward, the drive sprocket 5 and take-up reel 3 rotate to wind up the film. At the same time, the shutter setting cam 6 and the control cam 7 rotate, but since the shutter is set by normal rotation of the motor 1 immediately after rewinding,
The shutter set lever 51 simply swings. Also, the frame feed switch S4 linked to the control cam 7 is turned off every time the film is transferred by one frame, but since the jump feed switches S1 and S2 are on, the motor 1 rotates continuously. Wind up the 3 flying pieces.

When the first frame is pulled out of the cartridge and transferred to the photographing position, the blank feed switches S1 and S2 are turned off during this process. However, during the winding process, the frame feed switch S4 is turned on, so the motor 1 continues to rotate. and the first
When the frame is transferred to the photographing position, the control lever 48 is rotated counterclockwise to turn off the frame advance switch S4. When the frame advance switch S4 is turned off, no voltage is applied to the comparator 73, so its output terminal becomes "H". The forward rotation relay 76 is cut off, and the forward rotation relay switch S6
Since the contact point b switches to the contact point b, the electric brake is applied and the motor 1 suddenly stops.

During film winding, the scale plate 29 rotates by one pitch each time the film is wound by one frame, and when the first frame is placed at the shooting position, the number "1" on the scale plate 29 aligns with the index 30. We are doing so. Furthermore, when the film is transferred, the film transfer detection switch S8, which is linked to the driven sprocket, is turned on and off repeatedly, so that a pulse signal is output from the differentiating circuit 90, causing the lamp 91 provided at the top of the camera body to blink. , to indicate that the film is being fed normally.

In order to photograph the first frame, the release lever 58
When pressed, the shutter release lever 57 is rotated clockwise and the pin 56 of the shutter drive lever 54 is released. The shutter drive lever 54 rapidly moves to the left under the tension of the spring 55 to operate the shutter. At the time of shutter release, switch S5 is turned on to discharge capacitor 72.

After the shutter is actuated, the shutter drive lever 54 moves further to the left and pushes the control lever 48 with one end thereof, causing it to rotate clockwise. This control lever 48 moves its protrusion 48a to the control cam 7.
At the same time, the frame advance switch S4 is turned on. When the frame feed switch S4 is turned on, the forward rotation relay 76 is energized again, causing the motor 1 to rotate forward. When the motor 1 rotates forward, it winds up the film as described above, swings the shutter set lever 51 driven by the shutter set cam 6, moves the shutter drive lever 54 to the right, and moves the pin 56 to the shutter. It is locked to the tally release lever 57.

When the film is transferred by one frame, the control cam 7 and control lever 48 turn the frame feed switch S.
4 is turned off, the normal rotation of the motor 1 is stopped.
At this time, the number "2" on the scale plate 29 is the index 30.
It matches.

In this way, when the shutter is released and the photographing is completed, the motor 1 automatically rotates in the normal direction to wind up the film by one frame, and at the same time sets the shutter.

FIG. 6 is a time chart showing the rewinding state. If the loaded cartridge takes 36 shots,
Normally, it becomes impossible to pull out the film from the cartridge in the middle of winding 37 frames. Therefore,
Since the control cam 7 stops rotating, the frame advance switch S4 remains on, and during this time the capacitor 72 is charged. Then, when a time t1, which is longer than the time T required to wind up one piece, has passed,
Since the voltage at point A exceeds the voltage at point B, the comparator 73 is inverted, its output terminal becomes "H", the forward rotation relay 76 is cut off, and the motor 1 is stopped. In this case, since the frame advance switch S4 is on, when the forward rotation relay switch S7 leaves contact point a, the potential at point Q becomes positive. As a result, the comparator 79 enters the operating state, and the output terminal becomes "L" after a period of time sufficient to connect the forward rotation relay switch S6 to the contact point b. When the output terminal of the comparator 79 becomes "L", the reversing relay 82 is energized and the reversing relay switch S7 is switched from contact a to contact b. The motor 1 automatically starts reversing because a reversing circuit is formed, and at the same time, the comparator 86
enters the operating state, and its output terminal becomes "L". Note that when the reverse relay switch S7 is connected to contact a, the transistor 83 becomes conductive, so the capacitor 77 is discharged and the comparator 7
The output terminal of 9 becomes "H". However, since it is an open collector connection, the reversing relay 82 is kept energized by the comparator 86.

When the motor 1 reverses, the rewind shaft 11
The spool shaft of the cartridge 12 rotates and the film is rewound onto the cartridge 12. During this rewinding,
A pulse signal is output from the differentiating circuit 90, turning on the transistor 89, discharging the capacitor 85 at a constant cycle, and blinking the lamp 91 to indicate that the film is being rewound. During rewinding, the drive sprocket 5 is reversed as the film is transferred, so the shutter set cam 6 and the control cam 7 are reversed, and the film counter 8 is also decremented. Even if the shutter set cam 6 is reversed, the shutter set lever 51 does not follow the shutter set cam 6 due to the clutch function of the lever 52. Therefore, the shutter drive lever 54
Since the control lever 48 is pushed in the charge release position, the frame advance switch S4 remains on, and the control cam 7 simply rotates in the reverse direction.

When the first frame is rewound from the photographing position into the cartridge 12, the pin 38 engages with the check pawl 37 to prevent the film counter 8 from returning.
At this time, the scale plate 29 is located between the numbers "1" and ".", and the jump feed switches S1 and S2 are on. Note that after the scale plate 29 is locked,
Since the counter feed lever 25 can rotate clockwise against the spring 44, the intermittent feed shaft 25
rotates while escaping from the ratchet wheel 26.

Even after the film counter 8 is locked, the motor 1 rotates in reverse to rewind the film. When the film has almost finished rewinding, the perforation is removed from the driven sprocket. The differentiation circuit 90 is
Since the pulse signal is no longer output, the lamp 91 stops blinking and the transistor 89 is turned off. The capacitor 85 is charged with an approximately constant current, and when the voltage at point C exceeds the voltage at point D, the output terminal of the comparator 86 becomes "H" and the reversing relay 82 is cut off.

When the reverse rotation relay 82 is cut off, the reverse rotation relay S7 is switched to the contact b side, and the reverse rotation of the motor 1 is stopped. However, since the frame feed switch S4 is on, the output terminal of the comparator 73 becomes "L", energizing the forward rotation relay 76 and switching the forward rotation relay switch S6 to contact a. As a result, the motor 1 rotates in the normal direction, rotating the shutter set cam 6 and the control cam 7, and also operating the film counter 8. The shutter is set by the normal rotation of the motor 1, and the motor 1 is stopped when the frame advance switch S4 is turned off. At this time, the number "1" on the scale plate 29 appears.

In the present invention having the above-mentioned structure, after the film is finished rewinding, a normal rotation circuit is formed for the motor to rotate the motor in the normal direction until the frame advance switch is turned off, so that the film load of the driven sprocket is utilized. The configuration is simpler than the conventional device in which the rotation direction of the control cam is switched by the rotation direction of the control cam. Another advantage is that sophisticated machining and adjustment to obtain minute movements of the driven sprocket are not required.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the camera mechanism of the present invention. FIG. 2 is an explanatory diagram showing the features of the present invention. FIG. 3 is a perspective view showing a film counter, a shutter setting mechanism, and a frame advance control mechanism. FIG. 4 is a block diagram showing the motor control device of the present invention. FIG. 5 is a timing chart of the circuit of FIG. 4 showing the winding state. FIG. 6 is a timing chart showing the rewinding state. 6...Shutter set cam, 7...Control cam,
20... Sprocket shaft, 24... Intermittent feed shaft,
26... Ratchet wheel, 29... Scale plate, 37... Non-return pawl, 39... Locking lever, 40... Counter return lever, 48... Control lever, 51... Shutter set lever, 54... Shutter Drive lever, 5
8...Release lever, S1, S2...Switch for blank feed, S3...Back cover switch, S4...Switch for frame feed, S6...Relay switch for forward rotation,
S7...Relay switch for reverse rotation, S8...Switch for detecting film transfer, S9...Switch for rewinding, 73, 79, 86...Comparator, 76...
...Forward rotation relay, 82...Reverse rotation relay, 90...
... Differential circuit.

Claims (1)

[Scope of Claims] 1. A frame-advancing switch that is turned on when the shutter is operated and turned off when the film has been wound up by one frame, and a motor that rotates while the frame-advancing switch is on. In an electric winding camera, the shutter is set and the film is wound up by the forward rotation of the motor, and the film is rewound by the reverse rotation of the motor.While the motor is rotating in the reverse direction, the frame advance switch is left on and the film is not switched. A forward rotation circuit is formed for the motor after a predetermined time after film transfer is completed during rewinding, and the motor is configured to be stopped when the frame feed switch is turned off during normal rotation of the motor. This is an electric wind-up camera. 2. The electric wind-up camera according to claim 1, further comprising a back cover switch connected in series with the frame advance switch and turned on when the back cover is closed. 3. The camera is characterized by including a blank feed switch which is connected in parallel with the frame feed switch and is turned on in a period from the start frame to the middle of transferring the first frame to the photographing position in conjunction with the film counter. An electric wind-up camera according to claim 2. 4. The electric film winding camera according to claim 3, wherein the film counter is locked when the film counter returns to a position between the last jump frame and the start frame during film rewinding. .