JPS5883827A - Film automatic rewinding device - Google Patents

Abstract

PURPOSE:To start automatically the film rewinding when the film winding is terminated, by providing a photocoupler which detects the state of transportation of the film and starting the film rewinding when it is detected that the output of this photocoupler is not steady. CONSTITUTION:A photocoupler 35 which detects the passage of perforations 41 to detect the state of film transportation is provided in the transportation path of a film 34. Though a turn-on/off signal is outputted for passage of every perforation 41 during winding of the film 34, this turn-on/off signal is not outputted when the film 34 runs out. This is detected by a prescribed circuit to reverse a motor M1, and a gear 8 bites a gear 27, and a rewinding fork 32 is rotated clockwise, and thus rewinding is started. Therefore, rewinding is started automatically when the film winding is terminated, and troubles for rewinding are eliminated to make the operation convenient.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic film rewinding device using a mechanism for detecting film transport.

In conventional cameras, after winding the film to the end, the user had to press the R button and turn the film rewind crank to rewind the film. Even in cameras that use a motor to rewind the film, it is necessary to turn on a switch for rewinding the film, which is very cumbersome.

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, it is an object of the present invention to provide an automatic film rewinding device that automatically starts rewinding at the end of film winding.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a configuration diagram of a main part of a camera to which a first embodiment of the present invention is applied, FIG. 1 is a perspective view of a switch SW4, and FIG. 3 is a perspective view of a back cover 39. The job is the motor, and even though pinion gear 3 is attached to the tip of the shut via a friction spring, the rotation of the motor area is slowed down by the gear name and transmitted to gear 7. The gear ring meshes with the gear 7 and is attached to the base plate yh with the shaft 7a of the gear 7 as the center of rotation. Therefore, depending on the rotational direction of the motor area, the gear g is a three-stage gear 10°//, /
2 or the gear 27. Gear 10 is the axis IO'l of gear 10! It is connected to the film advance sprocket /3 via L. Gear/2 transmits rotation to spool/7 via gear ltA/R and friction spring/B. The spool /7 is provided with a narrow part /ria, and the rim detection roller / supported by the support member /9 is attached to the outer periphery of the narrow part /7a'.
The two are pulled by the spring 〇 and are in contact with each other. Film detection roller/g is spool/7. When the film 3'l is wrapped around, it is pushed to the outer periphery of the film 3'l, and at this time the switch SwI is turned on. The rotation of gear // is transmitted to gear 23 via gear 22.

Gear 23 has cam 23 on top? L is provided and connected to a shutter (not shown) or a charging mechanism of an automatic nodal mechanism. A cam 23b for feeding the fixed length film is provided at the lower part of the gear 23, and the fixed length feeding lever 2'l pulled by the spring 2S comes into contact with the cam 23b.

When the protruding end of the fixed-length feed lever 2q falls into the recess of the cam 23b, the switch SW2 is turned on, the rotation of the motor M is stopped, and the fixed-length feed is completed.

The gear 27 sequentially transmits rotation to Gyako g, 29, 30, 3/, and rotates the film rewinding fork 32 fitted into the center hole of the cartridge 33. A photocoupler 33 is provided at a position where the perforation lI/ of the film 3'l passes through, and every time the perforation lI/ of the film No. 3 passes through the photocoupler 3S, a signal is generated as described below. Output to the circuit. The upper part of the gear 10 is provided with a counter drive gear O via a shaft 1lOa.
is provided, and in one rotation of the buronate 13, a force is input via the counter drive gear II0 and the gear 4I. /wo/ Send a frame. There is a convex part on the periphery of counter 3? 4a is fixed, and the counter 36 changes from "S" to r.
When pointing between IJ, which convex part j4a pushes the convex part J7a attached to the tip of switch SW,
Turn off switch SW3. Also, the convex portion 39 is also on the back panel 39.
&, when the back panel 39 is closed, switch SW4
Press the convex portion Eta to turn off the switch SW4.

Next, the circuit constituting the device according to the first embodiment of the present invention is
This will be explained according to the diagram.

FF4 is a JK7 rip 70 tube, and is set during film winding, during film winding, and during film feed, and outputs a high-level signal from output terminal Q. A terminal of a control circuit (not shown) is also connected to input terminal J, and the input terminal A film winding signal is input to J.

A clock pulse generation circuit (not shown) is connected to a clock pulse input terminal CP, and receives a clock pulse signal.

The output terminal of the OR circuit OR is connected to the input terminal K. The terminal T2 of the control circuit (not shown) is connected to the reset input terminal R, and a constant high level signal is input when the power is turned on or at other necessary switching points.
An output terminal Q of F is connected to an input terminal of an AND circuit AD, an input terminal of an AND circuit AD, an input terminal of an AND circuit AD4, and an input terminal of an OR circuit OR. Also J
K flip-prop FF, output terminal Q is OR circuit O
It is connected to the input terminal of R,. O- is an OR circuit,
The force is applied at the time when tension in the film is detected during film winding. The output terminal Q of JK flip-flop FF3 is the input terminal J of JK flip-flop FFt.
and is connected to the input terminal of the OR circuit ORt and the input terminal of the monostable multivibrator OM.

OR, -1'i This circuit outputs a high level signal when winding is completed and rewinding is completed using an OR circuit. Its output terminal is connected to a terminal T of a control circuit (not shown).

The output terminal of the AND circuit ADt is connected to the input terminal of the OR circuit OR. The output terminal of the AND circuit AD4 is connected to the input terminal of the OR circuit QR3 and OR.

FF detects the tension state with the JK flip-flop, sets it, outputs a high level signal to the Q terminal, starts rewinding, is reset by the film winding switch SW1, and sends a low level signal to the Q terminal. Output.

A terminal T of a control circuit (not shown) is connected to a reset input terminal R of the JK flip-flop FF, and a high level signal is inputted when the power is turned on or at any other desired time.

A clock pulse generation circuit (not shown) is connected to this clock pulse input terminal CP, and a clock pulse signal is input thereto. The output terminal of the inverter circuit IN is connected to the input terminal of the JK flip-flop FF, the input terminal of the AND circuit AD, the input terminal of the JK flip-flop FF, the input terminal of the OR circuit OR1, and the input terminal of the D flip-flop F-F4. Connected to the reset input terminal.

The output terminal Q of the JK flip-flop FF2 is ant circuit AD! input terminal of buffer circuit BF, input terminal of OR circuit OR, and buffer circuit BF.
Connected to 40 input terminals. The output terminals of the buffer circuit BF6 are a resistor island and a light emitting diode LED.

grounded via. The resistor R7 is a current limiting resistor, and the light emitting diode LED3 is a means for indicating when rewinding is in progress.

AD is an AND circuit, film winding is released, and JK
When the flip-flop FF outputs a high level signal from the output terminal Q, the rewinding is completed and the circuit outputs a high level signal.

OR is an OR circuit which outputs a high level signal when the JK flip-flop FF2 outputs a high level signal or when the film is advanced. Its output terminal is connected to the input terminal of buffer circuit BF.

Next, AD is a circuit that turns on the light emitting diode LED forming the photocoupler 38 after the film is wound by the winding signal in an AND circuit. One terminal of the switch sw1 is grounded, and the other terminal is connected to the input terminal of the inverter circuit IN. Power supply V-DD is also resistor R
4 to the input terminal of the inverter circuit 'IN2. The resistor - is a pull-up resistor for the inverter circuit IN. 2, the output terminal of the inverter circuit IN is the input terminal of the inverter circuit IN, and the AND circuit AD,
connected to the input terminal of The output terminal of the AND circuit AD is connected to the input terminal of the buffer circuit BF. The output terminal of buffer circuit BF is connected to the base of resistor TR. TR2 is a transistor for switching on and off the light emitting diode LED constituting the photocoupler 35. transistor TR
The emitter of 2 is grounded. The power supply VDD is connected to the collector 1 of the transistor TR2 via a resistor and a light emitting diode LED4. The LED 4 constitutes a photocoupler 35 with a light emitting diode. The resistor is a resistor and is a resistor for the current side and eye that inputs the power supply VDD. TR4' is a phototransistor and constitutes a photocoupler 35 together with the light emitting diode LED4. 3S is a photocoupler that detects the moving state of the perforator/of the film 3'1 moving between the light emitting diode I LED and the phototransistor TR4; means for detecting the moving state of the three films from K; It is. The emitter of phototransistor TR4 is grounded. The power supply VDD is connected to the input terminal of the inverter circuit IN and the transistor TR through a resistor.
connected to the collector of

The resistor island is a pull-up resistor for the inverter circuit IN. The output terminal of the inverter circuit IN is the capacitor C1.
via the input terminal of the buffer circuit BF and the resistor R3
and a diode D, which are grounded through a parallel circuit. The capacitor C1 and the capacitor R8 are a circuit for differentiating the output signal from the inverter circuit IN. Diode D1 is a means for clamping the negative output of this differential waveform. The output terminal of the buffer circuit BP is connected to the input terminal of the OR circuit OR and the clock pulse input terminal cP' of the D flip-flop FF4. Next, SwI is a switch which is turned on when the film 3'l is wound onto the spool/7.

The next KFF is a D flip-flop circuit that turns on and off every time perforation lIl is detected. The inverting output terminal Q is connected to the input terminal.

Output terminal q is connected to the input terminal of AND circuit AD3. The output terminal of the AND circuit AD is connected to the input terminal of the buffer circuit BF, and its output terminal is grounded via the resistor island and the light emitting diode LED. Resistor R3 is a current limiting resistor. Light emitting diode LED.

is a means of indicating that the film is being wound.

The AND circuit AD is a circuit that outputs a signal of no 1 repel only during winding.

Next, OR, is an OR circuit, which outputs a high-level signal to reset the counter circuit CT with either the pulse signal generated by the detection of barf tration, during power-up, or when winding is not in progress. It is. The output terminal of the OR circuit ORI is connected to the reset input terminal R of the counter circuit CT. CT, . is a counter circuit that detects that there is no burntation. A clock pulse generation circuit (not shown) is connected to the clock pulse input terminal cp. Carry output terminal C is JK
It is connected to terminal J of flip-flop FF. FF3
is a circuit that detects film tension using a JK flip-flop. A clock pulse generation circuit (not shown) is connected to the clock pulse input terminal.

A terminal T2 of a control circuit (not shown) is connected to a reset input terminal R.゛Output terminal Q is JK, 7 lip-flop F
It is connected to the input terminal J of F, the input terminal of the OR circuit 0-, and the input terminal of the monostable multivibrator OM. The inverting output terminal Q is connected to the input terminal of the AND circuit AD4. AD4 is an AND circuit which detects that the switch SW2 is turned on when the winding is not in the tension state and outputs a high level signal. The output terminal of the inverter circuit IN4 is connected to the input terminal of the AND circuit AD40.

The output terminal of the buffer circuit BF is connected to the base of the transistor TR7. TR is a switching transistor that is turned on during winding and unwinding. The capacitor is grounded and the terminals T4 and T of the switch Sws are connected to the collector. The output terminal of the buffer circuit BF4 is connected to the base of the transistor R3. T
-R3 is a switching transistor that is turned on during rewinding.

The emitter is grounded, and the power supply VBAT is connected to the collector of the transistor TR3 via a relay.

The relay is means for switching by acting on the control terminal of the switch 5wl1O in response to a signal from the transistor TR. SW is a switch means for switching between forward and reverse rotation of the motor M.

Power supply VDD is connected to terminals T4 and T of switch 8W. The power supply VDD is connected to the input terminal of the inverter circuit IN and the terminal of the switch S via a resistor. Resistor R1 is a pull-up resistor for INNO (-Yuhiji IN).The other terminal of switch S% is switch SW
, and are connected to the terminals of SW4. Kui 4'chi SW, and 8
% hard Kyoko is grounded. Both terminals of the motor are connected to the two control terminals of the switch SW. Motor M
One terminal of the switch SW is connected to a terminal of the switch SW. Further, other terminals are connected to terminals of switches SW3 and 8w4. Furthermore, the terminals of switches SW and SW4 are connected to switch S
Connected to the wfl terminal.

SW2 is a switch that is turned on when winding is completed. SW is a switch that turns on when the back cover is opened. SW4 is a switch that is turned off until the empty feed is completed. The outside of the motor is a drive means that winds up the film by rotating in the forward direction and rewinds it by rotating in the reverse direction. Next is the monostable multivibrator OM.

The output terminal of is grounded via the resistor island and the light emitting diode LED2. The resistive island is a current limiting resistor.

A light emitting diode (LED) is a means for indicating the so-called tension state in which the film has finished winding and slipped.

Next, the operation of the apparatus according to the first embodiment of the present invention having the above-described configuration will be explained in the following section.
The explanation will be based on the circuit diagram shown in the figure.

First, a description will be given of the operation when the shutter button is pressed with three films, that is, cartridge 3S, not loaded in the camera and with the back cover 39 open. back cover 3
When q is open, switch SW4 is on,
The counter 36 has returned to the "S" position by a mechanism not shown. Therefore, switch SW3 is one convex part 3? a rides on the convex portion 3A'a of the counter 36 and is turned off. Also, since the cartridge 33 is not loaded in the camera, the film detection roller/g is the narrow diameter part of the spool/7/7? When the shutter button is pressed while the lens is in contact with the outer periphery of L, the switch and the S are off, and the shutter button is pressed, the autofocus mechanism and shutter will operate. When the shutter operation is completed, a member (not shown) rotates the fixed length feed lever 2'l clockwise (when viewed from the top of the camera, the same applies hereafter) and turns off the switch 8%. Thereafter, a film winding signal from a control circuit (not shown) is input to the JK flip-flop tr, ;yy input terminal J via the terminal T1, and the JK flip-flop FF receives a high-level signal from the output terminal Q through an OR circuit. Output to OR4. OR circuit O
R, this is a re-high level of faith! This signal passes through the buffer circuit BF and turns on the transistor TR1.

At this time, the switches Sws at both ends of the motor M1 are connected to the T side, and the motor M rotates counterclockwise. The counterclockwise rotation of motor M1 is controlled by gear 47.
is transmitted to the main plate 9 fixed to the shaft 7a of the gear 7,
This allows the gear groove to be rotatably supported on the main plate.
10. Mesh with /l and /2. This gear zato gear io,
// , due to the meshing of i2, Q, the sprocket 3 fixed on the shaft /□a of gear IO, the L-C gear /, l, /I
Through this, both the levers 7 rotate in the film winding direction, and the charging system performs charging by the camco 3a provided on the gear 23. During this time, the switch S is off, so the input signal to the inverter circuit IN is at a high level.This high level signal is inverted by the inverter circuit IN and becomes a low level, and this low level signal is inverted by the inverter circuit IN. The rate is at a high level. This high level signal is input to the counter circuit OR, which converts the high level signal to the counter circuit C.
Since the output signal is output to the reset input terminal R- of the counter circuit CT, the output signal from the carry output terminal C of the counter circuit CT does not become high level. In addition, inverter circuit IN3
The high level output signal of JK flip-flop FF
, is input to the input terminal K of JK flip-flop F
F is a low level signal from the output terminal Q. JK is the input terminal of the flip-flop, amplifier FF, and the OR circuit OR.
, a high level signal is output from the inverting output terminal Q to the ant circuit AD, respectively. As the charge progresses, the
The member that was rotating the length feed lever 2 in the clockwise direction is also charged, and the fixed length feed lever 2 is rotated counterclockwise by the spring J5.

When winding of the film 39 one frame at a time is completed, the protruding end portion of the fixed length feed lever 2q contacts the recessed portion of the cam 23b, and the switch SW is turned on. As a result, the input signal of the inverter circuit IN becomes low level, this low level signal is inverted by the inverter circuit IN, and a high level signal is input to the AND circuit AD4. Since a high level signal is input from the output terminal Q of the JK flip-flop FF1 to the AND circuit AD4, the AND circuit A
The input signal of D4 is at a high level, and the AND circuit AD4 outputs a high level signal to the OR circuits 0-1OR.

As a result, the OR circuit OR8 goes high. A high-level signal, that is, an end signal, is output to a control circuit (not shown) via a terminal T8, and the OR circuit OR2 outputs a high-level signal to the input terminal K of the JK flip-flop FF1.
The JK flip-flop FF outputs a low level signal from the output terminal Q to the OR circuit OR4. On the other hand, J.K.
A low level signal is input to the input terminal J of the flip-flop FFt.

JK flip-flop FF outputs a low level signal from output terminal Q to OR circuit OR. therefore,
The OR circuit OR4 outputs a low level signal, which passes through the buffer circuit BF and turns off the transistor TR. At the same time, both ends of the motor are short-circuited by turning on the switch SW2, so that the motor M1 suddenly stops and winding of the film ends. During this time, the counter drive gear qO is gear 4 of the counter 36! The counter 36 advances because it is disengaged from the
Therefore, the switch Swa is never turned on. In this manner, even if the shutter button is pressed with the back cover 3q open, the camera operates normally, so the camera operation can be easily checked.

Next, we will explain what happens when you press the shutter button with the film 3'1, that is, the cartridge 33, not loaded in the camera and the back cover 39 closed. Switch SW by convex part, ?9a
4 is turned off, and the counter drive gear lI0 and the gear '12 of the counter 36 are brought into mesh by a mechanism (not shown). However, as in the previous case, film 3'l is not loaded in the camera, so the film detection roller
g is in contact with the narrow diameter part /7a of the spool /7,
Switch SW1 is off. When the shutter button is pressed in this state, the winding operation is performed in the same manner as when the shutter button is pressed with the back cover 39 open. However, even if the tip of the fixed-length feed lever cog contacts the concave part of the cam 23b and the switch SW2 is turned on after winding is completed, the back cover 39 is in the closed state, so the switch 8% is turned off. remain as the switch SW,
is off because the counter 36 is near the "S" position. Therefore, the input signal of the inverter circuit IN40 is at a high level, a low level signal is input to the AND circuit AD, and the AND circuit AD outputs a low level signal to the OR circuit OR. Since the output signal of the output terminal Q of the JK flip-flop FF3, which is the other input signal of the OR circuit OR, is at the ~ level, the OR circuit OR
, is the low level signal of the JK solid flop FF,
(Input to the p input terminal K. In other words, the output signal of the output terminal Q of the JK flip-flop FF is the same as before (high level. Therefore, the transistor TR1 remains on and the motor M continues to be energized, Motor M,
Therefore, both ends of the spool 17 are not short-circuited.
, Sprocket)/,? , f// continues to rotate in the film winding direction, and the protruding tip of the fixed length feed lever 2 is pushed out from the surface of the cam 23b and rotates clockwise, and the switch SW2 is turned off again. When this is repeated several times, the counter 36 is advanced by the counter drive gada O and reaches the position of "No", and the convex part 3 of the swing 'f37
The engagement between the lever a and the convex portion 3Aa of the counter 36 is disengaged, and the switch 5W3- is turned on. After this, the fixed length feed lever 2'
When the protruding end of the cam 23b falls into the recess of the cam 23b, the switch S% is turned on and a high level signal is output to the AND circuit AD. Therefore, all the input signals of AND circuit AD are at high level, and AND circuit AD outputs high level signals to OR circuits OR, , OR8. The OR circuit 0- outputs a high level signal to the input terminal K of the JK clip-flop FF.

is output from the output terminal Q to the OR circuit OR, which is a low level signal. Since the other output signal of the OR circuit OR is also at a low level, the output signal of the OR circuit OR4 changes from a high level to a low level, turns off the transistor TR, and stops energizing the motor M. -! - is short-circuited, motor M1 is suddenly braked, and OR circuit O
An end signal is output from terminal R to a control circuit (not shown) via terminal T. The operation up to this point corresponds to the blank feed of the film, and even if no film is loaded, you can easily check the blank feed operation of the film. Instead of being off, the switch SW is on, and the counter 36 is 4.
Other than that, the operation is exactly the same as when the back cover 3q is opened, and the operation of the camera can be checked even if the film 3II is not loaded.

Next, the operation when the film 3'1, that is, the cartridge 3β is loaded into the camera will be explained. When the film 3'l is loaded into the camera, the back cover 3q is closed, and the shutter button is pressed, the film 31! Start empty feeding. During this time, the film 3 is sent to the spool /7 by the sprocket /3, and is wound around the spool /7 by an autoloading mechanism (not shown). When the film 3'l is wound around the spool/7, the film detection roller/g loses contact with the narrow diameter portion/7& of the spool/7, rotates clockwise, and turns on the switch SW. switch SW
When , is turned on, the input signal of the input circuit IN2 becomes low level, and a high level signal is output to the AND circuit AD.The other input terminal of the AND circuit AD is connected to the JK flip-flop FF1. output terminal Q
Since a signal of Notsuta level is output from 1. The AND circuit AD outputs a high-level signal to the transistor TR1 via the buffer circuit BF, which turns on the transistor TR, and the photocoupler 3S starts operating. The photocoupler 3S outputs a periodic on/off signal from the transistor TR4 to the inverter circuit IN every time the perforation of the film 3'l passes through the photocoupler 3S. The on/off signal inverted by the inverter circuit IN1 is connected to the capacitor C3 and the resistor R.
After being differentiated by a differentiator circuit consisting of 5, a buffer circuit,
The signal is input to the OR circuit OR1 via BF2.

As long as the photocoupler 35 outputs a periodic on/off signal, a high-level signal is input from the output terminal of the OR circuit OR1 to the reset input terminal R of the counter circuit CT. The output signal from the carry output terminal C of the circuit CT never becomes high level. On the other hand, the clock pulse input terminal CP of the D flip-flop FF receives a differentiated signal corresponding to the periodic on/off signal output every time the perforation lI/ passes through the photocoupler 35. buffer, −
The signal is input through the circuit BP, and as a result, a repeating signal of bi-level and low level is output from the output terminal Q of the D flip-flop FF to the AND circuit AD.

Since the output signal of the output terminal Q of the JK flip-flop FF1, which is the input signal to the other input terminal of the AND circuit AD, is at a high level, the AND circuit AD receives a signal corresponding to the repetitive signal of high level and low level. is output to the light emitting diode LED via the buffer circuit BF3 and the resistor.
D. flashes repeatedly to display "Film winding".

In the embodiment of the present invention, the film detection roller/g and the photo coupler 3S are both connected to the perforated V on the same side.
Regardless of the mounting position of the photocoupler 3S, no matter how long the notch in the leader part of the film 3'l is Even though 3q is wound around spool/7, the photocoupler 3S does not detect the current. However, if the photocoupler 35 is always installed at the position where a part of the leader of the film 3q ends when the film detection roller/g detects the film 3'l, then the photocoupler 3S and the film detection roller 7g The above arrangement may be different.

In this way, load the cartridge 33 into the camera, and
9 and press the shutter button 7 times, the film 3'l will be automatically fed to the shooting position, and at the same time a message will appear indicating that the film 3'l is being fed to the shooting position, so you can take a photo. It can be done easily and safely. From now on, when you press the shutter button, the aforementioned film 3 is loaded (・After the automatic focus mechanism and shutter operate as in the case without it, the spool/7 and sprocket 13
rotates in the film winding direction and stops after rotating by :'C (actually winding the film 3tl in this case)/frame. During this time, the light emitting diode LED flashes and displays "Film winding in progress", and the counter 3B advances by 737 minutes.

During this time, the film 3'l is pulled out from the cartridge 133, so the fork 32 is rotated counterclockwise, and this rotation is transmitted to the gears 3/, 30°2q, 2g, and 27. There is no problem because gear g and gear g do not engage. However, as the shooting progressed and the film was being wound, film 3
When 'l disappears, the load on the motor increases, but at this time, a slip occurs between the friction pane and the pion gear 30, preventing the sprocket /3 from breaking the perforation lI/ of the film 3'1. in this way,
While the slip occurs between the friction spring and the pinion gear 3, the film 3II6 is not fed, so the output signal of the photocoupler 3S (either high level or low level) remains at a constant level, and this is differentiated. No signal is output and the input signal of the OR circuit OR is at a low level.

Since the switch S is on, the input signal to the inverter circuit IN is at a low level, and the output signal from the inverter circuit IN to the OR circuit OR is at a low level. - Also, the inverted output of the JK flip-flop FF and the output signal of the terminal Q are at low level.In addition, the reset input terminal R of the counter circuit CT1 receives a high level output signal from the OR circuit OR. No reset signal is input, and the force/counter circuit CT1 outputs a high level signal from the output terminal Q after a certain period τ has elapsed.

These signals at various levels are input to the input terminal J of the JK flip-flop FF, and the JK flip-flop FF
The output signal of the output terminal Q of , is high level, and the output signal of the inverted output terminal Q is low level. The output signal of this output terminal Q is input to the OR circuit OR, which outputs a high level signal to the input terminal K of the JK flip-flop FF1. When a high-level signal is input to the input terminal K, the JK flip-flop FF outputs a high-level signal from the inverting output terminal Q to the OR circuit 0°, which causes the OR circuit OR1 to output a high-level signal. A signal is output to the counter circuit CT, glue set input terminal, and R. From now on, the reset input terminal R of the counter circuit CT
The input signal continues to be input to the counter circuit CT,
is in a reset state. In addition, a high level signal is output from the output terminal Q of the JK flip-flop FF to the monostable multivibrator OM, which outputs a high level signal for a certain period of time, and this signal is transmitted to the resistor. Light emitting diode LED2 via bird
The light emitting diode (LEI) lights up for a certain period of time to indicate "Film End". Furthermore, the high level signal from the output terminal Q of the KJK flip-flop FF3 is input to the input terminal J of the JK flip-flop FF, and the JK flip-flop FF2 transmits the high level signal from the output terminal Q to the buffer circuit BF4 and the OR circuit OR. , and then to the buffer circuit BF.

Output to. As a result, transistors TR and TR
s is turned on, the switch SW is switched to the terminal T side by the relay L connected to the transistor TR, and current flows through the motor M in the opposite direction to that during film winding, and the motor area is clockwise. Rotate in the direction. At this time, the short circuit to the motor is opened, so it does not matter whether the switch SW2 is on or off. The clockwise rotation of this motor is transmitted to gear 7 via pinion gear 3 and gear 6, which rotates base plate 9 clockwise and transfers gear g to gear 10. , //, /2, and mesh with gear 27. The rotation of gear 7 is
27.2g, 29, 30.3/, the fork 32 is rotated clockwise and the film 3'l begins to be rewound. During film rewinding, the sprocket/3 and therefore the counter drive gear 110 are rotated clockwise by the film 3D, and the counter 36 is rotated in the opposite direction. The spool 17 is also rotated clockwise by the film 3'llC, and this rotation is caused by the gear/! ;, /'I, /2, and the rotation of gear IO does not interfere with the rotation of gear 12.

Furthermore, since the charging and fixed length feed gears 23 are not moved at all even when the film is rewound, the charging system members and fixed length feed lever 2q'' are not moved by the cam 23a or 23b.
It doesn't get stuck and stop moving. Also,
The other day JK flip flop FF! A high level signal from the output terminal Q of is outputted to the light emitting diode LED' through the buffer circuit BFil and the resistor, and the light emitting diode LED3 lights up to display "film rewinding". When the film rewind progresses and the counter 36 comes to a position before r/J, the protrusion 37a of the switch SW rides on the protrusion 3Aa of the counter 3A, turning the switch SW off, but the circuit does not operate. do not. Thereafter, when the film rewinding is completed and the film 3 is detached from the spool /7, the film detection roller /g comes into contact with the narrow diameter part /7a of the spool 17, and the switch: fSW1 is turned off. When the switch Swl is turned off, the inverter circuits IN and I
N, the input signal to the AND circuit AD2 becomes high level. And the other input signal of AND circuit AD, JK flip-flop FF! The output signal from output terminal Q of is also high level, the input signals of AND circuit AD are both high level, AND circuit AD outputs a high level signal to OR circuit OR3, and OR circuit OR is high level. The signal, that is, the end signal, is outputted to a control circuit (not shown) via a terminal T. At the same time, a high level signal is input to the input terminal K of the JK flip-flop FF2, and the JK flip-flop FF outputs a low level signal from the output terminal Q to the OR circuit OR4 and buffer circuits BF4 and BF. do. On the other hand, the output signal of the output terminal Q of the JK flip-flop FF is at a low level, and the OR path OR is outputting a low level signal to the buffer circuit BP. Therefore, the transistors TR1 and TR@ are completely turned off, the power supply to the motor M is stopped, the relay L is turned off, the switch SW is connected to the terminal T, and the motor stops with the film being wound up. . At the same time, the light emitting diode LED for displaying "film rewinding" goes off, and rewinding is completed.

As explained above, when the 1, -Z film is finished, the photocoupler 33 detects that the on/off output signal is no longer repeated and automatically starts film rewinding. 4. It is possible to stop the film rewinding operation automatically. This eliminates the need for rewinding the film after shooting, which is very convenient. Furthermore, the following operations are displayed using light-emitting diodes: ``Film winding'', ``Film winding complete'', and ``Film rewinding'', so you can shoot with confidence.

Next, a third embodiment of the present invention will be described.

FIG. S is a block diagram of a main part of the apparatus of this embodiment applied to a camera, and FIG. 6 is a circuit diagram thereof. This embodiment uses a sprocket and a switch that turns on and off as the sprocket rotates, instead of the photocoupler used in the first embodiment, to detect film transport.

The automatic rewinding device according to this embodiment has almost the same mechanism and operation as the automatic rewinding device according to the first embodiment described above, so the different mechanisms, circuits, and operations will be explained. gO is a sprocket for detecting film transfer fixed to the shaft OC, and is arranged so that its teeth penetrate through the perforation lI/ of the film 3'l. A counter drive gear gOa and a cam gOb are further fixedly attached to the shaft gOC, and the rotation of the sprocket θ drives the counter drive gear gOa, and the cam ZO rotates at the same time, causing the switch S
Turn W on and off. That is, sprocket ga,
v Yaft goa, cam gob, 1tsuchi SW6 is the first
It operates in place of the photocoupler 3S in the embodiment. Furthermore, in this embodiment, a switch SW for detecting the cartridge 33 is provided in place of the switch SW4 of the back cover 3q of the first embodiment. is the switch SW,
Press the tip of Nuits fsw? Turn off the switch SW to start air transport 2, and when it is not loaded, turn on the switch SW and
It serves as a frame sender. Next, differences from the first embodiment on the circuit will be described. Photocoupler 35° transistor TR2 in FIG. 4, which is a circuit diagram of the first embodiment.
The aforementioned switch SwT is provided in place of the buffer circuit BF1 and circuit AD.

In this embodiment, the sprocket go does not move at all unless film is loaded in the camera, so when the back cover 3q is closed without film being loaded, the sprocket go is always This results in one frame-by-frame forwarding, which saves power compared to skip forwarding. Further, since the switch g/ is repeatedly turned on and off during film rewinding, it is possible to blink the light emitting diode s7 for indicating film feeding even during film rewinding.

As explained above, the present invention automatically starts rewinding the film at the end of winding to Hay 4. This has the effect of eliminating the hassle of turning on the rewind motor.

[Brief explanation of drawings]

FIG. 7 is a configuration diagram of main parts of a camera to which the first embodiment of the present invention is applied, FIG. 2 is a perspective view of the switch SW, and FIG.
The figure is a perspective view of the back cover 39, FIG. 1 is a circuit diagram of a circuit constituting the device according to the first embodiment of the present invention, and the electrical diagram shows the main components of a camera to which the device according to the second embodiment of the present invention is applied. FIG. 6 is a circuit diagram of a circuit constituting a second embodiment of the present invention. 3j, 10. tubSzaoc,SW,・・・・・・・・・
...Film transport state detection means, lI/...mountain perforation, hgnH
・・・・・・・・・ [Film winding in progress] display means,
LED], ...... "Film winding complete"
display means.

Claims (1)

[Scope of Claims] t. An electric drive device for a camera that transports film by electric drive, comprising a film transport state detection means for electrically detecting the transport state of the film, and a signal from the film transport state detection means. 1. An automatic film rewinding device characterized in that when the film is no longer in a steady state, the film winding operation is stopped and the film rewinding operation is automatically performed. 2. The automatic film rewinding device according to claim 1, wherein the film transport state detection means is means for detecting the movement state of the bar 7 oration. 3. The automatic film rewinding device according to claim 1 or 2, further comprising a display means for displaying the state of film winding based on a signal from the film transport state detection means during film winding. . The automatic film winder according to any one of claims 1 to 3, further comprising a display means for displaying "Film winding complete" based on a signal from the film transport state detecting means at the end of film winding. Return device.