JPH0233132B2 - DENDOKAMERA - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric camera that automatically winds and rewinds photographic film.

In this type of electric camera, the photographic film is transferred one frame at a time during winding, and when all the frames have been photographed and the transfer of the photographic film has stopped, the forward rotation circuit of the motor is turned off, and the reverse rotation circuit is turned on instead.
The camera rewinds the photographic film, and when the rewinding is finished, the reversing circuit is turned off. If these sequences are not performed correctly, the camera will not operate properly. Therefore, conventional electric cameras use complex circuits to perform sequence control.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electric camera that has a simple configuration and can perform sequence control correctly.

The present invention provides a forward rotation timer circuit which has a delay time sufficient to judge the running condition of the photographic film and which turns on the forward rotation circuit of the motor under the control of the frame advance switch during winding of the photographic film. , a timer circuit for reverse rotation control that prevents a forward rotation circuit and a reverse rotation circuit from being formed at the same time, and controls the ON/OFF of the reverse rotation circuit according to the regulation of the frame feed switch, and a timer circuit that operates after the reverse rotation circuit is formed. and a reversal timer circuit that maintains the reversal circuit until a predetermined time has elapsed after the photographic film stops running, and a reset circuit that detects the photographic film running and resets the forward rotation timer circuit and the reverse rotation timer circuit. It consists of a circuit.

That is, the forward rotation timer circuit determines the film running state during winding, and the reverse rotation timer circuit determines the film running state during rewinding. The reversal control timer circuit prevents both timer circuits from being activated at the same time, and regulates when reversal starts and when reverse ends.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In FIG. 1, a motor 1 for driving a camera mechanism has a special structure in which it is also used as a take-up spool 2 in order to make the camera smaller. That is, the stator is used as the take-up spool 2,
A rotor is housed within this take-up spool 2. A plurality of claws 3 are formed on the lower outer periphery of the take-up spool 2, and a photographic film 4 is attached to the claws 3.
perforation 4a is engaged.

A shaft 5 is provided parallel to the take-up spool 2, and guide roller support arms 6 and 7 are rotatably supported on the upper and lower parts of the shaft 5, respectively. The upper guide roller support arm 6 is biased counterclockwise by a spring 8, and by pressing the guide roller 9 supported at its tip against the outer circumferential surface of the take-up spool 2, the outer circumference of the take-up spool 2 is To prevent loosening of photographic film 4 wound up. Similarly, the lower guide roller support arm 7 is also urged counterclockwise by a spring 10. The guide roller 11 supported by the guide roller support arm 7 has a diameter reduced at the portion facing the claw 3, and presses the photographic film 4 at the upper and lower positions of the claw 3. Therefore, this guide roller 11 is
Perflation 4a of photographic film 4 is nail 3
It acts to engage.

A spool shaft 13 is fixed to the upper part of the take-up spool 2, and a hole 13a of this spool shaft 13
The rotating shaft 14 of the motor 1 protrudes upwardly through the shaft. Two E-rings 15 and 16 are fixed to the rotating shaft 14 at appropriate intervals. A drive gear 17 is loosely fitted onto the rotating shaft 14 between these E-rings 15 and 16, and is pressed against the upper E-ring 16 by a spring 18. Since the drive gear 17 and the rotation shaft 14 are frictionally coupled by the spring 18, when a load of a certain value or more is applied to the drive gear 17, the rotation of the rotation shaft 14 is transferred to the drive gear 1.
7 is not transmitted.

A cylindrical leaf spring 19 is fitted around the outer periphery of the spool shaft 13. Projecting piece 19 of this cylindrical leaf spring 19
a fits into the notch 20a of the spool drive gear 20. Since the spool drive gear 20 and the take-up spool 2 are frictionally connected by the cylindrical leaf spring 19, when a load of more than a certain value is applied to the take-up spool 2, the spool drive gear 2
0 rotation is not transmitted to the take-up spool 2. Note that this spool drive gear 20 and the take-up spool 2
The frictional coupling between the rotary shaft 14 and the driving gear 17 is weaker than the frictional coupling between the rotating shaft 14 and the drive gear 17.

The rotation of the drive gear 17 is controlled by gears 22, 23, 24, 25, 26, which constitute a reduction gear train.
The signal is transmitted to gear 28 via 27. This gear 2
8 is fixed to the sprocket shaft 29, so
When the motor 1 rotates, the sprocket shaft 29 rotates. A driving sprocket 30 is fixed to the sprocket shaft 29, and its pawl 30a engages with a perforation 4a of the photographic film 4 to transport the photographic film 4. During winding, this drive sprocket 30 rotates 480 degrees in the direction of the solid line to transport the photographic film 4 by one frame.

A gear 32 is fixed to the upper part of the sprocket shaft 29, and this gear 32 drives a gear 34 via a gear 33. These gears 33, 34
is provided on the counter return lever 35. The gear 34 is provided with an intermittent feed shaft 36 having a V-shaped notch, which meshes with a ratchet wheel 37 to rotate the ratchet wheel 37 by one pitch with one rotation of the intermittent feed shaft 36. When this ratchet wheel 37 rotates by one pitch against the restoring spring 38, a counter disc 39 fixed to this ratchet wheel 37 also rotates, and the number of film frames of the photographic material is displayed based on the value that matches the index 40. do.

The back cover detection section 35a is attached to the counter return lever 35.
is provided, and when the back cover (not shown) of the camera is closed, a force in the direction of the arrow acts against the spring 41 on the back cover detection portion 35a, so that the counter return lever 35 moves counterclockwise. direction to engage the intermittent feed shaft 36 with the ratchet wheel 37. Conversely, when the back cover is opened, the counter return lever 35 rotates clockwise and the intermittent feed shaft 36 and ratchet wheel 37 are disengaged. In this case, the ratchet wheel 37 and the counter disc 3
9 is returned to the starting piece "S" by the restoring spring 38.

The gear 28 meshes with a gear 46, which also meshes with the spool drive gear 20. Here, when winding the photographic film 4 by one frame, the gear 28 rotates 480 degrees, and the gear 46 rotates 480 degrees.
Rotates 360 degrees. A control cam 47 for controlling frame feeding and a shutter setting cam 48 for setting the shutter are provided coaxially with this gear 46.

A feed claw 50 is provided on the lower surface of the gear 28, and engages with the ratchet wheel 51 only during rewinding to rotate it in the direction shown by the dotted line. A gear 52 is fixed to the lower surface of the ratchet wheel 51. This gear 52
The rotation is transmitted to gear 55 via gears 53 and 54. An E-ring 57 is attached to the upper part of a rotating shaft 56 on which a gear 55 is fixed.
It is held so that it does not slip out. A spring 59 is disposed between these gears 55 and 58, and this spring 59 causes the gears 55 and 58 to
are frictionally coupled, and when a load of a certain value or more is applied to the gear 58, the rotational force of the gear 55 is not transmitted to the gear 58. Further, a gear 60 meshes with the gear 58, and a rewinding pawl 61 is provided coaxially with the gear 60. This rewinding claw 61
engages a spool housed within a cartridge (not shown).

In order to detect the running condition of the photographic film 4,
A driven sprocket 62 is provided which engages the perforation 4a. Note that a roller or the like may be used in place of the driven sprocket 62 and rotated by the photographic film 4.
This driven sprocket 62 is provided with a plurality of pins 63, for example, six pins.
2 rotates, the film running detection switch S2 repeats ON and OFF to generate a film running signal.

In FIG. 2, a control lever 65 for controlling frame feeding is supported by a shaft 66, and when the photographic film 4 is transferred by one frame, a protrusion 65a provided on a part of the lever 65a is moved by a spring 67. It falls into the notch 47a of the control cam 47 under the tensile force of , and at the same time, the frame advance switch S3 for stopping the rotation of the motor 1 is switched from contact a to contact b. In addition, contact b turns off the forward rotation circuit of motor 1.
Therefore, the state in which it is in contact with contact b is said to be OFF, and the state in which it is in contact with contact a is said to be ON.

The shutter set cam 48 has a leaf shape, and a pin 69 of the shutter set lever 68 comes into contact with the outer periphery of the shutter set cam 48. Shutter set cam 48 is 180
The shutter set lever 68 pivots counterclockwise until the shutter rotates 180 degrees to 360 degrees, and the shutter set lever 68 pivots clockwise while the shutter rotates 180 degrees to 360 degrees.
Therefore, every time the shutter set cam 48 rotates once, the shutter set lever 68 reciprocates once.

When the shutter set lever 68 pivots counterclockwise, its free end pushes the bent portion 70a of the shutter drive lever 70 and moves it to the right. This shutter drive lever 70 sets the shutter (not shown) when moving to the right.
Then, the shutter is opened when returning to the left due to the accumulated force of the spring 81. Further, when the shutter drive lever 70 moves to the right, its vertical portion 70b pushes the bent portion 71a of the interlocking lever 71 to move it to the right. A spring 6 is provided between the interlocking lever 71 and the control lever 65.
7 is hung, and a spring 74 is also hung between it and the locking lever 73. Therefore, when the interlocking lever 71 moves to the right, the locking lever 73 pivots counterclockwise, and at the same time, the spring 67 is loaded.

The release lever 75 has a horizontal groove 76a and a vertical groove 7.
6b is formed, and the free end of the locking lever 73 is inserted into this groove. When the shutter is set, the locking lever 73 is inserted into the vertical groove 76b, and if the release lever 75 is pushed down against the spring 77 in this state, the pin 78 of the release lever 75 will push the shutter lever 79 and pin 80 is released, the shutter drive lever 70 is moved to the left by the spring 81. When the release lever 75 rises, the locking lever 73 enters the horizontal groove 76a, so the interlocking lever 71 is released and returns to the left end while pushing the locking lever 73 by the stored force of the spring 72. When the interlocking lever 71 returns, the vertical portion 71b pushes the free end of the control lever 65 and rotates it clockwise, causing the protrusion 6
5a from the notch of the control cam 47. Note that when the interlocking lever 71 returns, the springs 67 and 74 are not loaded with energy.

FIG. 3 shows the counter mechanism, in which a sliding brush 82 of the idle feed switch S1 and a sliding brush 83 of the timer switch S4 for changing the delay time of the timer circuit are shown on the lower surface of the ratchet wheel 37. It is provided. These sliding brushes 82, 8
3 moves together with the ratchet wheel 37, the sliding brush 82 contacts the contact 84a of the board 84 and the common contact 84b, and the sliding brush 83 contacts the contact 84c and the common contact 84.
b.

This jump feed switch S1 is turned on during the winding of the next piece after the start piece, and turned off during the winding of the first piece. The timer switch S4 is activated when the counter disk 39 is at the start piece "S".
It turns ON, and then turns OFF when the number of pieces smaller than the minimum number of 12 pieces for the patrone, for example, the third piece, is rolled up.

FIG. 3 shows the motor control circuit, and when forward rotation relay switch S5 is connected to contact a and reverse rotation relay switch S6 is connected to contact b, power supply 85 and motor 1 are connected in series. The motor 1 rotates normally and winds the photographic film 4 onto the take-up spool 2. Conversely, when the forward rotation relay switch S5 is connected to the contact point b and the reverse rotation relay switch S6 is connected to the contact point a, the motor 1 rotates in the reverse direction and rewinds the photographic film 4.

A CR time setting circuit consisting of a resistor 86 and a capacitor 87 is connected between the connection point P and the frame advance switch S3. This resistor 86 and capacitor 87
The + side input terminal of the comparator 88 is connected to the connection point A with. This comparator 88 -
The side input terminal is connected to a connection point B between resistors 89 and 90. A series circuit of a timer switch S4 and a capacitor 91 is connected in parallel to this capacitor 87.

When the timer switch S4 is turned on, the capacitor 91 is connected in parallel to the capacitor 87, so the delay time of the timer circuit is longer than the time T required to wind the photographic film 4 by one frame, as shown in FIG. It is set at time t1. Therefore, even if the photographic film 4 is not loaded, the motor 1 can rotate in the forward direction to advance the frame to the frame for which the timer switch S4 is turned on for demonstration purposes.

When the timer switch S4 is turned off, only the capacitor 87 is charged, so the delay time t2 of the timer circuit is shorter than the time T required to wind up one frame. When the photographic film 4 is not loaded or when all the frames have been photographed, this timer circuit is activated for a time t2.
When , a reversal circuit of motor 1 is formed,
Motor 1 reverses. Note that this time t2 may be any value that is sufficient to judge the running state of the film, but when taking into account errors in the film running signal due to troubles in the film running detection switch S2, T/2≦t2<T. It is desirable that there be.

When the output terminal of the comparator 88 is "L", it energizes a forward rotation relay coil (hereinafter simply referred to as a forward rotation relay) 92 to connect a forward rotation relay switch S5 to a contact a. Then, when the delay time t2 elapses or the frame advance switch S3 is turned off, its output terminal is inverted to "H" and the forward rotation relay 92 is turned off.

The frame advance switch S3 is used for the photographic film 4.
When one frame is wound up, it connects to contact b and
The output terminal of the comparator 88 becomes "H" and the forward rotation relay 92 is turned off. Further, a resistor 93 forming a discharge path of the capacitor 87 is connected to the contact b. A jump feed switch S1 is connected in parallel with this frame feed switch S3, and is turned on during winding of the second jump feed piece.
However, it turns OFF in the middle of winding the first piece. Therefore, the jump feed switch S1 energizes the forward rotation relay 92 to continue rotating the motor 1 even if the frame feed switch S3 is turned off within the jump feed section.

A transistor 94 is connected in parallel with the capacitors 87 and 91, and is turned on by a pulse signal from a differential circuit 95, for example, a one-shot multivibrator, to discharge the capacitors 87 and 91. As a result, while the photographic film 4 is running, the forward rotation timer circuit is reset at regular intervals. As shown in FIG. 8, the differentiating circuit 95 operates at the falling edge of the film running signal generated from the film steady running detection switch S2, and divides the pulse signal into 1.
Output each item one by one. The pulse signal may be output at the rising edge of the film running signal, or a plurality of pulse signals may be output in response to one film running signal. Since this differential circuit 95 is provided, the film running detection switch S2 is
Even if the driven sprocket 62 stops rotating in the ON state, the forward rotation timer circuit is not held in the reset state. Further, since a lamp 96 is connected to the output terminal of the differential circuit 95, the running state of the photographic film 4 is displayed by blinking the lamp 96.

In the forward rotation timer circuit, the delay time becomes shorter than the time required to wind up one frame when the frame reaches the fourth frame or higher. At the same time, the forward rotation timer circuit is reset in synchronization with the rotation of the driven sprocket 62. As a result, photo film 4
Even if the perforation 4a is torn by the drive sprocket 30 when the frame cannot be pulled out from the cartridge, the forward rotation timer circuit is activated before the frame advance switch S3 is turned OFF, so the frame advance is not stopped. You can rewind without continuing. If this perforation 4a is not to be broken, the film running signal can be obtained in synchronization with the rotation of the drive sprocket 30, or the delay time of the forward rotation timer circuit can be made longer than one frame. If so, the timer switch S4 can be raised or omitted.

A capacitor 97 and a resistor 98 are connected in series between the connection point Q and the frame advance switch S3. The connection point between the capacitor 97 and the resistor 98 is connected to the + side input terminal of the comparator 99, and the connection point between the resistors 100 and 101 is connected to the - side input terminal. In this reversal control timer circuit, at the start of frame feeding, the frame feeding switch S3 contacts contact a.
The time required for the output terminal of the comparator 99 to invert from "H" to "L" is
This is to delay the forward rotation relay switch S5 by a sufficient period of time to switch from contact b to contact a. In this case, the forward rotation relay switch S5
When is connected to contact a, the reversal control timer circuit becomes inactive, so the output terminal of comparator 99 remains at "H". This prevents the forward rotation relay 91 and the reverse rotation relay 102 from turning on at the same time, so that sequence control can be performed correctly. This also operates when the forward rotation relay switch S5 leaves contact a and switches to contact b in order to rewind the photographic film 4.
The comparator 99 is delayed, and then the output terminal of the comparator 99 is set to "L" to energize the reversing relay coil (hereinafter simply referred to as reversing relay) 102 and switching the reversing relay switch S6 to contact a. Further, this comparator 99 is also used to cut off the reverse rotation relay 102 and stop the motor 1 during reverse rotation when the frame advance switch S3 is turned off after rewinding is completed.

A resistor 10 is connected between the anode of the power source 85 and the connection point P.
3, a series circuit of capacitor 104, and resistor 105
and 106 series circuits are connected to each other. The connection point C between the resistor 103 and the capacitor 104 is connected to the + side input terminal of the comparator 107, and the connection point D between the resistors 105 and 106 is connected to the - side input terminal. This reversal timer circuit is activated when the reversing relay switch S6 is connected to contact a to form a reversing circuit for the motor 1, and the capacitor 104 is activated for the delay time t shown in FIG.
When the battery is continuously charged up to 3, its output terminal becomes "H". This delay time t3 is set to a relatively long time sufficient to completely wrap the leading edge of the photographic film into the cartridge. A transistor 108 is connected in parallel with the capacitor 104 and is turned on by a pulse signal from a differentiating circuit 95.
do.

The comparators 99 and 107 are open collectors, and when either one is "L", the reversing relay 102 is energized. Comparator 99 is used to regulate the start and end of energization of reversing relay 102, and comparator 1
07 is used to reverse the motor 1 and rewind the photographic film 4 into the cartridge.

The rewinding switch S7 is used when rewinding the photographic film from the middle, and when the rewinding switch S7 is turned on, the reversing relay 102 is energized. After that, the reversal relay 102 is turned ON by the comparators 99 and 107.
Therefore, even if the rewind switch S7 is released, the reverse rotation continues.

Next, the operation of the present invention having the above configuration will be explained with reference to FIGS. 5 to 7.

(1) When loading photographic film Engage the rewind pawl 61 with the spool of the cartridge, pull out the tip of the photographic film 4, and engage the perforation 4a with the pawls of the drive sprocket 30 and the driven sprocket 62. let When the back cover is closed, the back cover detection part 35a is pushed in the direction of the arrow, so the counter return lever 35
pivots counterclockwise to engage the intermittent feed shaft 36 with the ratchet wheel 37.

At the start of winding, the shutter drive lever 70 has moved to the right due to the previous rewinding and is now locked with the shutter lever 79.
At this time, the free end of the locking lever 73 has entered into the vertical groove 76b.

Therefore, when the release lever 75 is first depressed, the shutter lever 79 is pivoted clockwise by the pin 78 and the pin 80 of the shutter drive lever 70 is released. As a result, the shutter drive lever 70 moves to the left, and the shutter is opened and closed during this movement. When the release lever 75 is released, it rises and the free end of the locking lever 73 enters the horizontal groove 76a. This locking lever 73 releases the locking of the interlocking lever 71 biased by the spring 72, and is pushed by the locking lever 71 to pivot clockwise. When the interlocking lever 71 moves to the left, the control lever 65 connected by the spring 67 is simultaneously rotated clockwise to extract the protrusion 65a from the notch 47a of the control cam 47. When the control lever 65 is rotated clockwise, the frame feed switch S3 is switched from contact b to contact a and is turned on.

When the frame advance switch S3 is turned on, the output terminal of the comparator 88 becomes "L", so
The forward rotation relay 92 is energized, and the forward rotation relay switch S5 is switched from contact b to contact a.
On the other hand, since the reversing relay 102 is cut off, the reversing relay switch S6 is connected to contact b.

When the motor 1 starts normal rotation, the rotation of the motor 1 is transmitted to the drive gear 17 that is frictionally coupled to the rotating shaft 14 . This rotation of drive gear 17 is transmitted to gear 28 via a reduction gear train, causing sprocket shaft 29 to rotate by 490 degrees. As a result, the drive sprocket 30 rotates in the direction of the solid line and transports the photographic film 4 to the left.

On the other hand, the rotation of the sprocket shaft 29 is controlled by the gear 4.
6 to the spool drive gear 20. The rotation of the spool drive gear 20 is transmitted to the spool shaft 13 which is frictionally connected by a cylindrical leaf spring 19, and the spool shaft 13 rotates together with the take-up spool 2 fixed to the lower side of the spool shaft 13. This spool shaft 13 is considerably slowed down compared to the rotating shaft 14 of the motor 1, and since the load is large, it rotates slowly relative to the rotating shaft 14.

The photographic film 4 transferred by the drive sprocket 30 is moved to guide rollers 9 and 10.
is pressed against the outer periphery of the take-up spool 2, and its perforation 4a engages with the pawl 3, thereby performing autoloading.
Thereafter, the photographic film 4 is pressed down by the guide rollers 9 and 11, so that the photographic film 4 pulled out from the cartridge is wound around the outer periphery of the take-up spool 2 without loosening. Note that the amount of the photographic film 4 taken up by the take-up spool 2 is larger than the amount of photographic film 4 transferred by the drive sprocket 30, and this difference is due to the cylindrical leaf spring 1.
9 is absorbed by slipping on the outer circumference of the spool shaft 13.

During winding of the photographic film 4, the driven sprocket 62 is rotated by the photographic film 4, and the pin 6 provided on the driven sprocket 62 rotates.
Step 3 turns on the film running detection switch S2 eight times for each frame. As a result, the differentiating circuit 95 outputs a pulse signal and the lamp 96
The film running status is displayed by flashing, and the transistor 94 is turned on and off.

The timer switch S4 is turned on between the start drive "S" and the third frame because the sliding brush 83 contacts the common contacts 84b and 84c. Therefore, in this section, the forward rotation timer circuit is set to a time t1 that is longer than one frame. These capacitors 87 and 91
is periodically discharged by transistor 94, so the voltage at point A never rises to the inverted level of comparator 88.

Gear 46 that rotates when winding photographic film 4
The control cam 47 and the shutter set cam 48 provided coaxially therewith are rotated once.

As shown in Figure 2, the shutter set cam 4
8 pivots the shutter set lever 68 counterclockwise while rotating 180 degrees, and pushes the bent portion 70a of the shutter drive lever 70 with its free end to move the shutter drive lever 70 to the right. This shutter drive lever 70 sets the shutter when moving rightward, and is locked by a lever lever 79. As the shutter set cam 48 rotates an additional 180 degrees, the shutter set lever 68 pivots clockwise and its free end separates from the shutter drive lever 70.

When the shutter drive lever 70 moves to the right, its vertical portion 70b bends at the bent portion 71a.
Press to move the interlocking lever 71 to the right against the spring 72. This interlocking lever 71
As the locking lever 73 moves rightward, its free end enters the vertical groove 76b, allowing the release lever 75 to be pressed down. Also,
The interlocking lever 71 biases the control lever 65 counterclockwise by accumulating the spring 67, and presses the protrusion 65a against the outer peripheral edge of the control cam 47.

When the control cam 47 rotates once together with the shutter set cam 48, the control lever 65 is rotated counterclockwise by the spring 67, and its protrusion 65a enters the notch 47a. When this control lever 65 rotates, the frame advance switch S
3 switches to contact b, and photo film 4 switches to 1.
It is detected that the piece has been wound up.

Since the intermittent feed shaft 36 rotates once while the photographic film 4 is wound for one frame, the ratchet wheel 3
Send only one pitch of 7. This ratchet wheel 37 rotates together with the counter disc 39, so that the dot mark indicating the blank feed piece coincides with the index 40.

In this embodiment, there are three jump pieces including the start piece, and during the transfer of the jump pieces, the sliding brush 82 is connected to the contact point 84a and the common contact point 8.
Since it is connected to 4b, the jump feed switch S
1 is on. Therefore, the comparator 88 is maintained in an operating state even when the frame advance switch S3 is turned off, and the motor 1 continues to rotate.

When the third frame of the blank feed frame starts to be wound, the control cam 47 pushes the control lever 65 and moves the protrusion 65a.
is forcibly pushed out from the notch 47a, and the frame advance switch S3 is switched to contact a. Similarly to the above, one frame of the photographic film 4 is wound onto the take-up spool 2, and at the same time, the control cam 47 and the shutter set cam 48 rotate once, and the counter disc 39 rotates one pitch. Ru. Note that since the shutter drive lever 70 is in the set state, the shutter set cam 48 simply rotates once.

After empty-feeding three frames in this way, the winding of the first frame begins. Since the sliding brush 82 separates from the contact point 84a during this winding, the idle feed switch S1 is turned OFF. However, since the frame advance switch S3 is turned on during winding, the comparator 88 remains in the operating state. When winding of the first frame is completed, the control lever 65 is rotated to turn off the frame advance switch S3. When this frame advance switch S3 is turned OFF, no voltage is applied to the comparator 88, and the forward rotation relay 92 is cut off. As a result, the forward rotation relay switch S
5 switches to contact b, electrical braking is applied and the rotation of the motor 1 suddenly stops.

As described above, when the release lever 75 is pressed down, the shutter drive lever 70 moves to the left to operate the shutter and photograph the first frame. When the shutter drive lever 70 returns, the control lever 65 is rotated clockwise and the frame advance switch S3 is turned on. When the frame feed switch S3 is turned on, the forward rotation relay 92 is energized, and the motor 1 is rotated again to wind the photographic film 4 by one frame. Therefore, from the first frame onward, when the shutter is released and the photographing is completed, the motor 1 automatically rotates forward to wind the photographic film 4 by one frame, and at the same time sets the shutter.

When the photographic film 4 is wound up to the third frame, the timer switch S4 interlocked with the counter disc 39 is turned off. As a result, the delay time of the forward rotation timer circuit is set to a time t2 shorter than one frame. However, photographic film 4
is loaded in the camera, the forward rotation timer circuit is reset at a predetermined period by the film running signal generated during the film transport, and the fourth
Pieces after that are also rolled up in the same way as the third piece.

When the loaded cartridge takes 36 pictures, the motor 1 rotates idly due to the friction of the spring 18, since normally the photographic film 4 cannot be pulled out from the cartridge in the middle of winding the 37th frame.

In this case, since the photographic film 4 stops running, the differential circuit 95 does not output a pulse signal. Therefore, since the capacitor 87 is continuously charged, when time t2 elapses,
The voltage at point A increases to the voltage at point B.

As shown in FIG. 5, when time t2 has elapsed since the film stopped running, the comparator 8
8 is reversed and its output terminal becomes "H", the forward rotation relay 92 is cut off, and the motor 1 is stopped. In this case, the frame advance switch S3 is ON.
Therefore, when forward rotation relay switch S5 leaves contact point a, the potential at point Q becomes +. As a result, the comparator 99 becomes operational, and its output terminal becomes "L". The output terminal of this comparator 98 becomes "L". When the output terminal of this comparator 98 becomes "L",
The reversing relay 102 is energized and switching the reversing relay switch S6 from contact b to contact a. The motor 1 starts reversing because a reversing circuit is formed, and at the same time, the comparator 107 becomes operational and its output terminal becomes "L".

When motor 1 reverses, drive sprocket 3
0 rotates in the direction of the dotted line to unwind the photographic film 4 from the take-up spool 2 and transport it to the right. At the same time, the feed pawl 50 rotates the ratchet wheel 51 in the direction of the dotted line, and the rewind pawl 61 is rotated via the gear train. Since this rewind pawl 61 is connected to the spool of the cartridge, the photographic film 4 fed by the drive sprocket 30 is rewound into the cartridge.

Intermittent feed shaft 36 when rewinding photographic film 4
rotates to reverse the counter disk 39 one pitch at a time. Further, the control cam 47 and the shutter set cam 48 are also reversely rotated and operated in the same manner as the above-mentioned idle feed to set the shutter drive lever 70.

When the photographic film 4 is rewound, a pulse signal is output from the differentiating circuit 95 to turn on the transistor 108 at a predetermined period. Therefore, since capacitor 104 is alternately charged and discharged, the output terminal of comparator 107 is held at "L".

When rewinding of photographic film 4 is almost completed,
The perforation 4a comes off from the driven sprocket 62, and the rotation of the driven sprocket 62 stops. Since the differentiating circuit 95 no longer generates a pulse signal, the lamp 96 stops blinking and the transistor 108 is turned off.
Since the capacitor 104 is charged with a substantially constant current, the output terminal of the comparator 107 becomes "H" when the voltage at point C rises to the voltage at point D.
to be reversed. However, since the frame advance switch S3 of the comparator 99 is ON and its output terminal is set to "L", the reversal relay 102 continues to be energized. Then, when the frame advance switch S3 is turned off, the comparator 99 becomes inactive. Since the capacitor 97 is immediately discharged, the output terminal of the comparator 99 becomes "H", and the reversing relay 102 is cut off.

When the reverse rotation relay 102 is cut off, the reverse rotation relay switch S6 is switched to the contact point b, and the reverse rotation of the motor 1 is stopped.

At this time, the shutter drive lever 70 is set, and the protrusion 65a of the control lever 65 is inserted into the notch 47a of the control cam 47.

(2) When photographic film is not loaded At a store, etc., it is necessary to check the condition of the camera without loading photographic film 4. For this demonstration, for example, up to the third frame, the motor 1 can be rotated in the normal direction to advance frames. As shown in FIG. 7, since the timer switch S4 is ON for up to the third frame, the delay time is set to a time t1 that is longer than one frame. Therefore, the frame advance switch S3 is turned off before the capacitors 87 and 91 are charged and the voltage at point A rises to the voltage at point B.
Capacitors 87 and 91 are frame feed switch S3
discharged by. As a result, the motor 1 rotates normally in the same way as when the photographic film 4 is loaded.

When the winding of the third frame is completed, the timer switch S4 is turned off, so that the time t2 is set to be shorter than the time for one frame. Then, when time t2 has elapsed after the start of winding the fourth frame, the comparator 88 is inverted before the frame advance switch S3 is turned off. Therefore, a reversal circuit is formed and the motor 1 is rotated in the reverse direction, as in the case where all the frames have been photographed.

When time t3 elapses after the motor 1 starts reverse rotation, the voltage at point C rises to the voltage at point D, so the comparator 107 is inverted and its output terminal becomes "H". When the time t4, which is shorter than the time t3, has elapsed, the jump feed switch S1 is turned on if the jump feed section is entered. In this jump feed section, comparator 99
The output terminal continues to be “L”. Therefore, even if the comparator 107 is inverted,
The reversing relay 102 is controlled by the comparator 99.
is kept energized.

When rewinding the second jump-feeding frame, the jump-feeding switch S1 turns OFF during the rewinding process.
Since the frame advance switch S3 is ON, the output terminal of the comparator 99 is kept at "L". And the frame advance switch S3 is OFF.
Then, comparator 99 is reversed and motor 1
The reverse rotation stops.

The present invention having the above configuration has a simple structure because it includes a forward rotation timer circuit, a reverse rotation control timer circuit, a reverse rotation timer circuit, and a reset circuit to perform frame forwarding and rewinding. be. Also, since a timer circuit for reverse rotation control is provided,
A forward rotation circuit and a reverse rotation circuit of the motor are formed at the same time, thereby preventing sequence control from going out of order.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the camera winding mechanism, Fig. 2 is a perspective view showing the motor control mechanism, Fig. 3 is a perspective view showing the counter mechanism, Fig. 4 is a circuit diagram showing the motor control circuit, and Fig. 5 is a perspective view showing the camera winding mechanism. The figure shows a timing chart during winding, FIG. 6 shows a timing chart when rewinding, FIG. 7 shows a timing chart when no photographic film is loaded, and FIG. 8 shows a timing chart for the forward rotation timer circuit. 1... Motor, 2... Take-up spool, 4... Photographic film, 4a... Perflation, 39
... Counter disk, 47 ... Control cam, 48 ...
Shutter set cam, 62... Driven sprocket, 70... Shutter drive lever, 75... Release lever, 91... Forward rotation relay, 95... Differential circuit, 102... Reverse rotation relay, S1... For blank feed Switch, S2...Switch for film running detection, S3...Switch for frame advance, S4...Switch for timer, S5...Relay for forward rotation, S6...
... Reversing relay.

Claims (1)

[Scope of Claims] 1. A motor that winds a photographic film during forward rotation and rewinds the photographic film during reverse rotation, a forward rotation relay for causing the motor to rotate forward, and a reverse rotation relay for rotating the motor in reverse. , photographic film is 1
There is a frame advance switch that turns OFF when a frame has been wound up and turns ON when the shutter operates, and a frame advance switch that operates when the frame advance switch is ON and the reversing relay is OFF. A forward rotation timer circuit that keeps the diversion relay ON for a predetermined period of time, and a forward rotation relay that operates when the frame feed switch is ON and the forward rotation relay is OFF and turns on the reverse rotation relay after a delay of a predetermined time. The reversal control timer circuit that turns on the reversing relay and the reversing relay
Activates when turned on, and stays on for a predetermined period of time
1. An electric camera comprising: a reversal timer circuit that maintains the same state; and a reset circuit that detects film running and resets the forward and reverse timer circuits. 2. The electric camera according to claim 1, wherein each of the timer circuits includes a CR time setting circuit and a comparator. 3. The reset circuit consists of a transistor connected in parallel with the capacitor of the CR time-setting circuit, and a pulse generator that detects film running and outputs a pulse signal, which turns on the transistor. Characteristic claim 1
Electric camera described in section.