JPS61232433A - Automatic stopping device for rewinding in camera - Google Patents

Abstract

PURPOSE:To select optionally whether there is a tongue or not at the end of rewinding by generating two kinds of signals at two different points of time during rewinding operation, and using them selectively. CONSTITUTION:When a selector 73 is switched to the side of a position T, a conductive brush 70d short-circuits conduction parts 70b and 70c and a changeover switch 70 is turned on. When a film F is rewound in this state, the terminal part of the film F turns on a film detection switch in passing through a roller 76 to power off a motor M. When the selector 73 is switched to the side of a position N, the terminal part of the film F turns on the 2nd film detection switch 72 in passing through a detection pin 77, so the potential at the connection point between a terminal 79 and a pull-up resistance 122 falls to a level L and is sent to an AND gate 107 to power off the motor M. Consequently, a function with which the film is stopped automatically with its tongue left slightly in the cartridge and a function with which the film is all rewound and stopped automatically are selectable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to an automatic rewinding stop device for a camera in which film rewinding is performed electrically.

(Background of the Invention) Conventionally, this type of device has two types of devices: (1) one that automatically stops the rewinding operation with the end portion (tang) of the film remaining slightly outside the cartridge; There was one that automatically stopped the rewinding operation with all the film rolled into the cartridge without leaving any film outside.

However, in the above conventional example (1), the tongue of the film remains outside the cartridge, making it easy to take out the film when processing, but since the tongue remains outside the cartridge, the film cannot be photographed. There was a problem in that it was difficult to tell whether the film was already shot or the film had already been shot, and there was a risk that the same film would be exposed twice.

On the other hand, in the above conventional example (2), all the films are rolled into the cartridge, so they can be distinguished from unshot films, and there is no risk of shooting the same film twice. Since the tongue is inside the cartridge,
There was a problem in that it was difficult to take out the film during development processing.

(Objective of the Invention) The present invention has been made by paying attention to such conventional problems, and an object of the present invention is to provide an apparatus in which the presence or absence of a tongue at the end of rewinding can be arbitrarily selected.

(Summary of the Invention) To achieve the above object, the present invention provides a
The purpose is achieved by preparing two types of signals that are emitted at different times and selecting and using them.

(Example) Each example of the present invention will be described below based on nine drawings. Note that - similar parts in each embodiment are given the same reference numerals.

FIG. 1 shows a first embodiment of the invention.

FIG. 1 is a perspective view of the interior of a camera incorporating an automatic rewind stop device according to a first embodiment.

As shown in FIG. 1, the camera I is provided with a pressure plate 2, a sprocket 3, and a spool 4 for guiding the film F of a loaded cartridge P. Furthermore, the camera 1 includes a motor M as an electric motor, a film winding mechanism 5, a film rewinding mechanism 6, a rewinding operation section 7, and a driving force of the motor M is transmitted in conjunction with the rewinding operation section 7. a clutch mechanism 8 for switching between the film winding mechanism 5 and the film rewinding mechanism 6; and an opening/closing mechanism 10 for the camera back 9;
A locking mechanism 11 and an automatic rewinding stop device 12 are provided.

A sprocket shaft 13 is inserted through the sprocket 3, and a clutch 14 is provided between the sprocket 3 and the sprocket shaft 13.

This clutch 14 connects the sprocket 3 and the sprocket shaft 13 when the sprocket shaft 13 is in the raised position as shown in FIG. 1, and when the sprocket shaft 13 is pushed down from the position shown in the figure, the sprocket 3 and the sprocket shaft It is designed to break the connection with A release button 13a protruding to the outside of the camera 1 is formed at the tip of the sprocket shaft 13, and a large diameter portion 13b is formed at the lower part of the release button 13a. There is a pin 13 at the bottom of the sprocket shaft 13.
c is provided in a protruding manner, and a release block 15 is fixedly provided at the lower end thereof, and a spring member 16 is provided for urging the sprocket shaft 13 to the raised position. A locking member 17 that locks the stepped portion 15a of the release block 15 is supported by a shaft 17a.

The locking member 17 is held at its tip 17c by a spring member 17b.
is biased in the direction of contacting the outer peripheral portion 15b of the release block 15.

The film winding mechanism 5 transmits the rotation of the motor M to the sprocket 3 and the spool 4 via the clutch mechanism 8, and includes a first gear 18, a sprocket gear 19,
Second gear 20. It is composed of a third gear 21 and a spool gear 22.

The tin rocket gear 19 is rotatably fitted onto the sprocket shaft 13, and the cylindrical portion 19 of the sprocket gear 19
A is provided with a slot 19b through which the pin 13c passes. Thereby, the tin rocket shaft 13 can rotate together with the sprocket gear 19, and the sprocket shaft 13 can slide up and down with respect to the sprocket gear 19.

The spool gear 22 is connected to the spool 4 via a friction clutch 23, and is prevented from rotating counterclockwise by a reversal prevention pawl 24.

The rewind operation unit 7 includes a rewind lever 26 that is fixed to the shaft 25 and protrudes operably to the outside of the camera 1, a cam 27 that is fixed to the center of the shaft 25, and a cam 27 that is attached to the end of the shaft 25. A fixed switching lever 28, a leaf spring 29, and a rewind switch 3
The 0 rewinding lever 26 consisting of the cam 27
It can be rotated counterclockwise together with the switching lever 28 about the shaft 25 from the original position shown in the figure to the rewinding position. The leaf spring 29 is inserted into the groove 28a or 2 of the switching lever 28 to hold the rewinding lever 26 in the original position or the rewinding position.
8b. The cam 27 also has a cam portion 27.
a, the switching lever 28 has a bifurcated portion 28c and an arm portion 28.
d are formed respectively. The arm portion 28d is provided in a protruding manner so as to turn on the rewind switch 30 by rotating it counterclockwise from the position shown in the figure.

The film rewinding mechanism 6 transmits the rotation of the motor M to the hub P1 of the cartridge P via the clutch mechanism 8, and the first gear 31. Second gear 32° Cylindrical portion 3 of second gear 32
It is composed of a rewinding shaft 33 inserted through the rewinding shaft 2a, a disk 34 fixed to the rewinding shaft 33, and a fork portion 35. A pin 33 fixed to the unwinding shaft 33 is attached to the cylindrical portion 32a.
A slot (a) 32b is bored through it. This allows the unwinding shaft 33 to rotate together with the second gear 32,
Moreover, it is slidable in the vertical direction with respect to the second gear 32.

Since the disc 34 is held between the forked parts 28c, the fork part 35 can be moved up and down with the disc 34 between the non-engaged position shown in the figure and the engaged position raised from the above position by rotation of the switching lever 28. It is possible. The fork portion 35 engages with a key (not shown) of the hub P1 at the engagement position.

The clutch mechanism 8 connects the motor M and the i-gear 18 of the film winding 414I5 when the rewinding lever 26 is at the original position, and connects the motor M and the film rewinding mechanism when the rewinding lever 26 is at the rewinding position t. 6 first gear 3
1 is connected to the switching lever 28 of the rewind operation section 7 by an interlocking system 36.

The opening/closing mechanism IO includes a locking member 9a fixed to the back M9,
An engaging portion 37a that engages with the locking member 9a is formed, and an operating member 37 that is operated from the outside of the camera l. The operating member 37 is vertically movable between a closed position shown in the figure and an open position displaced upward from the closed position.

The lock @4111 includes the rotating lever 38 and the locking member 3.
9, the zero rotation lever 38 has a shaft 38a.
is biased counterclockwise by a spring member 40, and the arm 38b that contacts the cam portion 27a of the cam 27 and the lower end 39a of the opening member 39 are locked by the biasing force. A portion 38c is formed. The locking member 39 is biased counterclockwise around the shaft by a spring member 41. The lock member 39 has a non-latching portion 37b of the operating member 37 when the lock member 39 rotates clockwise from the unlocked position shown in the figure.
A step portion 39b for locking is formed.

A switch lever 42 is pivotally supported near the sprocket shaft 13 by a shaft 42a. The switch lever 42 is
The stopper 4 is biased counterclockwise by the spring member 43.
4 is locked in the original position shown in the figure. Further, the switch lever 42 is formed with a protrusion 42b that protrudes within the displacement locus of the large diameter portion 13b of the sprocket shaft 13, and a film detection switch 45 is held at the base end of the protrusion 42b.

The detection pin 4 is attached to the contact piece 45a of the film detection switch 45.
The base of 6 is fixed. The tip of the detection bottle 46 is
When the switch lever 42 is rotated clockwise from the position shown in the figure, it comes into contact with the upper edge Fl of the film F, and
When the terminal end passes through, it can protrude into the through hole 2a of the pressure plate 2 by its own biasing force. Contact pieces 45a and 45b of the film detection switch 45 are closed when the tip of the detection pin 46 is in contact with the film F, and are opened when the film passes and the tip of the pin 46 penetrates into the hole 2a. do. Note that the positions of the detection pin 46 and the through hole 2a are as follows:
It is located away from the entrance P2 of the cartridge P by a distance longer than the transport distance of the film F due to the inertia of the motor M.

A T position where the rewinding operation is automatically stopped with the end of the film F slightly left outside the cartridge P, and a state where all the film F is wound into the cartridge P without the end remaining outside the cartridge P. Automatically stop rewinding with N
A selector 48 for switching between positions is provided. The selector 48 can be operated from outside the camera l, and a cam 48a is integrally provided at its lower end. This cam 48a turns off the switch 47 when the selector 48 is in the T position, and turns on the switch 47 when the selector 48 is in the N position.

In FIG. 2, 100 is a winding signal generation unit that outputs a winding signal of H level upon completion of a series of exposure control operations;
This winding signal is input to AND gate 108. 10
Reference numeral 1 denotes a rewind stop signal generator that outputs an L-level rewind stop signal for stopping the motor M to the AND gate 107.

This rewinding stop signal generation unit 101 includes the film detection switch 45, a pull-up resistor 102 connected in series to the film detection switch 45, and a connection point between the pull-up resistor 102 and the film detection switch 45 and the ground. Connected switch 47 and capacitor 10
3, and an inverter 104 whose input terminal is connected to the connection point. Here, the inverter 104
is a configuration including a Schmitt circuit (not shown), etc., and is configured to change the output from H to L when the voltage at the connection point exceeds a predetermined voltage.

The rewind switch 30 is connected in series to a pull-up resistor 105, and its connection point is connected to the input terminal of an inverter 106. The output terminal of the inverter 106 is AND
Connected to the input terminals of gates 1o7 and 108. However, the input to 108 is applied as an inverted input.

Each output terminal of AND gates 107 and 108 is connected to an input terminal of OR gate 109. OR gate 1
The output terminal of transistor 09 is connected to the base of transistor 110. The collector of the transistor 110 is the motor M
, their emitters are connected to ground, respectively.

Note that when the switch 47 is on, the pull-up resistor 102 and the capacitor 103 output an L-level rewind stop signal to the AND gate 107 from when the film detection switch 45 is turned off until the output of the inverter 104 is inverted. This is a time constant circuit that waits until the This time constant outputs a rewinding stop signal to the AND gate 1O7 when the end of the film F reaches within a range where the distance from the entrance P2 of the cartridge P is shorter than the transport distance of the film F due to the inertia of the motor M. It is prescribed to do so.

Next, the operation will be explained.

(1) In the second normal shooting state, the rewind lever 26 is
In the original position shown in the figure, the arm portion 28d of the switching lever 28 is separated from the rewind switch 30, so the one rewind switch 30 is turned off. Therefore, an L level signal is sent from the inverter 106 to the inverting input terminal of the AND game 108. Further, the motor M is connected to the first gear 18 of the film winding mechanism 5 via the clutch mechanism 8.
It is connected to the.

When a series of exposure control operations are completed, the winding signal generation section 10
0 outputs an H level winding signal to the AND gate 108. At this time, the AND gate 108 outputs an H level signal to the OR gate 109, and the OR gate 109 also outputs an H level signal to the transistor iio. therefore,
Transistor 110 is turned on and motor M rotates.

The rotation of the motor M is controlled by a clutch mechanism 8. First gear 18° sprocket gear 19. It is transmitted to the sprocket 3 via the sprocket shaft 13 and the clutch 14, and the second gear 20. Third gear 21. It is transmitted to the spool 4 via the spool gear 22 and the friction clutch 23.

This allows spool 4. The sprocket 3 rotates and the film F is wound up. When the film F is wound by one frame, the output signal from the winding signal generation section 100 is L.
level, and motor M stops.

(2): When completing the shooting of all frames and performing rewinding, push down the release button 13a of the sprocket shaft 13 from the raised position shown in the figure, then switch the selector 48,
Finally, the rewind lever 26 is rotated counterclockwise from the original position shown in the figure to the rewind position.

When the sprocket shaft 13 is pushed down, its large diameter portion 1
3b presses the protrusion 42b of the switch lever 42,
The switch lever 42 rotates clockwise about the shaft 42a against the urging force of the spring member 43. This rotation pushes the film detection switch 45 and the detection pin 46 toward the film F, but at this time, the film F is on the pressure plate 2, so the tip of the detection pin 46 is pushed toward the upper edge Fl of the film F.
When the contact piece 45a contacts the contact piece 45b, the film detection switch 45 is turned on.

Next, if it is desired to automatically stop the rewinding operation with the end portion of the film F remaining slightly outside the hatron P, the selector 48 is switched to the T position as shown in FIG. This switching causes the cam 48a to turn off the switch 47.

When the rewind lever 26 is rotated counterclockwise from the original position shown in the figure to the rewind position, the cam part 27a of the cam 27 pushes the arm part 38b of the rotary lever 38, and the rotary lever 38 returns to the position shown in the figure. It rotates clockwise due to the urging force of the spring member 40. This rotation causes the locking member 39 to rotate counterclockwise due to the biasing force of the spring member 41, and the stepped portion 39b
Since the non-locking portion 37b of No. 7 is locked, the operating member 37 is
The engaging portion 37a is locked in the closed position where the locking member 9a is locked, and the back cover 9 cannot be opened from the outside of the camera 1.

When the rewind lever 26 is rotated counterclockwise.

The switching lever 28 also rotates in the same direction, and the fork 28c pushes up the disk 34, and the arm 28d turns on the rewind switch 30. When the forked portion 28c is pushed up, the fork portion 35 rises and engages with the key of the hub Pi. Further, the clutch mechanism 8 is switched, the motor M is connected to the first gear 31 of the film rewinding mechanism 6 via the clutch mechanism 8, and the rotation of the motor M can be transmitted to the hub Pl. When the film detection switch 45 is turned on, the film detection switch 45 is also already turned on.

Therefore, when the rewind switch 30 is turned on, an L level signal is input to the input terminal of the inverter 106, and an H level signal is output from the inverter 106 (AND gate)1.
07 and an inverting input terminal of AND gate 108, respectively. This allows AND gate 10
Gate 8 is closed. Also, since the film detection switch 45 is already on, the input of the inverter 104 is at L level, and therefore the output signal at H level is input to the AND gate 107. The output becomes H and O
An H level signal is input to transistor 110 via R gate 109, transistor 110 is turned on, and motor M rotates.

The rotation of the motor M is transmitted to the hub P1 of the cartridge P through the clutch mechanism 8, first gear 31, second gear 32, rewind shaft 33, and fork portion 35, and the film F is rewound into the cartridge P.

As this rewinding operation progresses, the end of the film F reaches the detection pin 4.
6, the tip of the detection pin 46, which had been in contact with the upper edge F1 up to this point, enters the through hole 2a of the pressure plate 2 due to the biasing force of the contact piece 45a. As a result, the contact piece 45a separates from the contact piece 45b, and the film detection switch 4
5 is off.

When the film detection switch 45 is turned off, the inverter 10
4 immediately receives an H level signal, and the inverter 104
That is, an L level signal is output from the rewind stop signal generation unit lot to the AND gate 107, and an L level signal is input to the transistor 110 via the OR gate 109. This signal turns off the transistor 110, and the power to the motor M is cut off. That is,
When the end of the film F passes the tip of the detection pin 46, the power to the motor M is cut off, and the film F is further rewound by the inertia of the motor M.

Here, the tip of the detection pin 46 is connected to the cartridge P by a distance longer than the film transport distance due to the inertia of the motor M.
Since the end of the film F is detected at a position away from the inlet P2 of the cartridge, even if the film F is further rewound due to the inertia of the motor M, the end of the film F will remain slightly outside the cartridge P when the motor detects the end of the film F. M is stopped, and the rewinding operation is automatically stopped.

If you want to automatically stop the rewinding operation with all the film F wound into the cartridge P without leaving the end of the film F outside the cartridge P, press the release button 13a and then press the button shown in FIG. Switch the selector 48 from the position to the N position. This switching causes the cam 48a to switch to the switch 4.
Turn on 7.

In this state, when the rewind lever 26 is switched counterclockwise from the position shown in FIG. 1, the rotation of the motor M is transmitted to the hub Pl in the same manner as described above, and the film F is rewound into the cartridge P.

As this rewinding progresses and the end of the film F passes the tip of the detection pin 46, the upper edge F
The tip of the detection pin 46 that had been in contact with the film detection pin 46 enters the through hole 2a of the pressure plate 2 due to the biasing force of the contact piece 45a, whereby the contact piece 45a separates from the contact piece 45b and the film detection switch 45 is turned off. . At this time, since the switch 47 is on, even if the film detection switch 45 is off, the AN
The input signal to D gate lO7 remains at L level,
From this point on, the current through pull-up resistor 102 begins to charge capacitor 103. Film detection switch 4
When a certain period of time defined by a time constant determined from the resistance value of the pull-up resistor 102 and the capacitance value of the capacitor 103 has elapsed since the turn-off of the AND gate 107, the input signal to the AND gate 107 changes from the H level to the L level. . As a result, the inverter 104 outputs an L level signal in the same manner as described above, and the power to the motor M is cut off.

At this point, the power to the motor M is cut off, but the film F is further rewound by the inertia of the motor M. Here, the time constant is determined by a rewinding stop signal of L level when the end of the film F reaches within a range where the distance from the entrance part P2 of the cartridge P is shorter than the transport distance of the film F due to the inertia of the motor M. from inverter 104 to AND gate 1
07, so the film F
is further rewound by the inertia of the motor M, and when the cassette is completely wound up inside the cartridge P, the motor M stops, and the rewinding operation is automatically stopped.

Next, a second embodiment of the present invention will be described based on FIG.

This embodiment is based on the rewind stop signal generation section 1 of the first embodiment.
Only 01 was changed. That is, when the selector 48 is switched to the N position and the M side, the switch 45
The delay time from the time when the motor M is turned off until the L-level rewinding stop signal is output to the AND gate 107 and the power supply to the motor M is cut off is created by a counting circuit provided in place of the CR time constant circuit. It is.

FIG. 3 shows a rewind stop signal generation unit 10 according to a second embodiment.
1 is a circuit diagram showing AND gate 107 in FIG.
It sends a signal to

As shown in FIG. 3, the film detection switch 45 is connected to a pull-up resistor 113, and the switch 47 is connected to a pull-up resistor 114. The connection point between the film detection switch 45 and the pull-up resistor 113 is the input terminal of the AND gate 116, and the connection point between the switch 47 and the pull-up resistor 114 is the inverting input terminal of the AND gate 115 and the input terminal of the AND gate 116. each connected.

Each output terminal of AND gate 115 and AND gate) 116 is connected to an input terminal of NOR gate) 117, and
The output terminal of the R gate 117 is connected to the input terminal of the AND gate 107.

111 is an oscillation circuit that sends a clock pulse to the input terminal K of the counter 112 via an AND gate 118.

The input terminal of the counter 112 is connected to the output terminal of an AND gate 118, its output terminal Q is connected to the inverting input terminal of the AND gate 118 and the input terminal of the AND gate 115, and its reset terminal R is connected to the film detection switch 45 and the pull-up resistor 113. are connected to the respective connection points.

When the counter 112 counts a predetermined number n of clock pulses, it changes the output of the output terminal Q from L level to H level, and maintains this H level state.

Next, the operation will be explained.

(1) When the selector 48 is switched to the N position,
Since the switch 47 is turned on, the potential at the connection point between the switch 47 and the pull-up resistor 114 becomes L level, and this signal is sent to the input terminal of the AND game 116 and the inverting input terminal of the AND game 115. By this, A
The output of the ND gate 116 becomes L level, and the AND gate 115 opens its gate. On the other hand, the film detection switch 45 closes the release button 13a when rewinding.
turns on when pressed down, so the potential at the connection point between the film detection switch 45 and the pull-up resistor 113 becomes L level, this signal is sent to the reset terminal R of the counter 112, and the counter 112 is reset. Become.

As a result, the output of the output terminal Q becomes L level, and this signal is sent to the inverting input terminal of the AND game) 11g.
AND gate) 11g opens its gate, and when the gate of AND gate 118 is opened, oscillation circuit 11
The clock pulse from 1 is sent to the input terminal K of the counter 112 through the AND gate 118, but the counter 112 does not start counting because it is in the reset state. It is also sent to the input terminal of AND gate 1.
The output of No. 15 becomes L level. At this time, AND game) 1
16 is also outputting an L level signal, so NO
An H level signal is output from the R gate 117 to the AND game 107, and the motor M is started to start the one-winding rewind operation in the same manner as described in the first embodiment. When the rewinding operation progresses and the end of the film F passes the tip of the detection bin 45, the film detection switch 45 is turned off. As a result, the potential at the connection point between the film detection switch 45 and the pull-up resistor 113 changes from the L level to the H level, and this signal is sent to the reset terminal R of the counter 112. Therefore, the reset state of the counter 112 is released, and the counter 112 starts counting clock pulses from the oscillation circuit ill. counter 1
12 counts a predetermined number n of clock pulses, the output of the output terminal Q changes from L level to H level, and this H
The level signal is sent to AND gate 118. This causes the AND gate 118 to close its gate, and the clock pulse from the oscillation circuit itt is no longer sent to the input terminal K of the counter 112.
The output terminal Q of is held at H level. Since this H level signal is sent to the AND gate 115, both outputs of the AND gate 115 become H level.

The signal from AND gate 115 goes from L level to H level, and the signal from NOR gate 117 goes from H level to L level. Therefore, in the same way as described above, the power to the motor M is cut off, and the motor M stops.

(2) When the selector 48 is switched to the T position side,
Since the switch 47 is turned off, the potential at the connection point between the switch 47 and the pull-up resistor 114 becomes H level, and this signal is sent to the input terminal of the AND gate 116 and the inverting input terminal of the AND gate 115. By this, A
The output of the ND gate 115 becomes L level regardless of the signal from the counter 112, and the AND gate 116 opens its gate, while the film detection switch 45
It turns on when the release button 13a is pressed down when rewinding, so the film detection switch 4 is turned on.
5 and the pull-up resistor 113 becomes L level. Then, as the rewinding operation progresses and the terminal end of the film F passes the tip of the detection pin 45, the film detection switch 45 is turned off. As a result, the potential at the connection point between the film detection switch 45 and the pull-up resistor 113 changes from the L level to the H level. As a result, the signal from the NOR gate 117 also changes from H level to L level,
Power to motor M is cut off.

As described above, in this second embodiment, the delay time from when the film detection switch 45 is turned off until the power supply to the motor M is cut off is determined by adding the predetermined number n to the time interval t of the clock pulses. It is multiplied by This delay time corresponds to the fixed time determined by the resistor 102 and capacitor 103 in the first embodiment.

Note that, according to the first embodiment and the second embodiment, the first
In the embodiment, the means for delaying the film detection signal is a time constant circuit such as a pull-up resistor 102 and a capacitor 103, and in the second embodiment, the means for delaying the film detection signal is an oscillation circuit 111 and a counter 112. , etc., there is no need to provide another special switch such as the film detection switch 45, and a large space is not required, resulting in cost reduction. In particular, with regard to the time constant circuit, if the time constant circuit is also used as a timer for controlling the shutter of a camera, the number of additional circuits can be minimized.

Next, a third embodiment of the present invention will be described based on FIGS. 4 and 5.

In this embodiment, only the portions related to the rewind stop signal generating section 101 of the second embodiment are changed. That is, a rotation angle detection means that outputs a pulse signal according to the rotation angle of the motor M is provided in place of the oscillation circuit 111,
The pulse signal from the rotation angle detection means is sent to the counter 1.
12 is used for counting. The other configurations are the same as those shown in FIGS. 1 and 2, so illustrations are omitted. .

As shown in FIGS. 4 and 5, rotation angle detection means 50
are interlocking gears 51a and 51b that mesh with and rotate with the output gear M1 of the motor M, a disk 52 that rotates integrally with the gear 51b, a light emitting section 53, a light receiving section 54, and one light emitting section 5.
3, and a resistor 120 connected to the light receiving section 54.

The disk 52 has a transparent pattern 52a formed radially.
and opaque patterns 52b are arranged alternately, and the circles 5152 chop the light emitted from the light emitting section 53 toward the light receiving section 54.The light emitting section 53 has at least the motor M rotating. At times, the light is emitted by the current defined by the resistor 119.

The connection point between the light receiving section 54 and the resistor 120 is the AND game)
118 input terminals. This light receiving part 54 is a circle! 152 Specifically, the opaque pattern 52b receives the light from the light emitting section 53 chopped by the opaque pattern 52b, and repeats the on operation when the light is received and the off operation when the light is blocked.Therefore, the connection point between the light receiving section 54 and the resistor 120. , a pulse signal is sent to the input terminal of the AND gate 118.

Therefore, in the operation of this embodiment, when the selector 48 is switched to the N position and the rewinding operation is performed, the film detection switch 45 is switched from on to off in the same manner as described in the second embodiment. , the reset state of the counter 112 is released, and the counter 112 connects the AND gate 1 from the connection point between the light receiving section 54 and the resistor 120.
Start counting the pulse signals sent through 18. When the counter 112 counts a predetermined number n of pulse signals, the output of the output terminal Q changes from the L level to the H level, and this H level signal is sent to the AND gate 118. As a result, the AND gate 118 closes its gate, and the pulse signal from the rotation detection means 50 is transmitted to the counter 11.
Since it is no longer sent to the input terminal K of counter 1,
No. 12 output terminal Q is held at H level. This H level signal is sent to the AND gate 115, so the AND
Both gates 115 go to H level, the signal from AND gate 115 goes from L level to H level, and N
The signal from OR gate 117 goes from H level to L level. Therefore, in the same way as described above, the power to the motor M is cut off, and the motor M stops.

In addition, in this second embodiment, as in the case of the third embodiment, the delay time from when the film detection switch 45 is turned off until the power supply to the motor M is cut off is equal to the time of the pulse signal. This is the interval t multiplied by the predetermined number n.

According to the third embodiment, the number of pulse signals corresponding to the rotation angle of the motor M is generated by the rotation angle detection means 50, and the number of pulse signals generated from the time when the film detection switch 45 is turned off is a predetermined number n. Since the counter 112 counts when the film reaches the end of the film M, even if the time required for rewinding changes due to fluctuations in the power supply voltage or the cartridge, the end of the film M can be wound into the cartridge P. I can do it.

In addition, in cameras equipped with means for detecting the rotation angle of the motor for fixed-rate film feeding, and cameras equipped with the detection means for speed monitoring to make the film feeding speed variable, the detection means is The rotation angle detection means 50
The space and cost for providing the rotation angle detection means 50 can be reduced.

Further, in this embodiment, the rotation angle of the motor M is directly detected by the rotation angle detection means 50, but the first gear 3
The rotation angle may be detected at any point in the film rewinding mechanism 6 from 1 to the fork portion 35.

Furthermore, the rotation angle detection means 50 is not limited to a photoelectric one, but may be one that detects pulses magnetically.

Next, a fourth embodiment of the present invention will be described based on FIGS. 6 and 7.

In this embodiment, instead of providing the selector 48 in the first and second embodiments, a selector operating section for switching the switch 47 is provided in a smaller size.
The operating section is configured so that it can be seen from the outside only when the back cover 9 is opened.

As shown in FIGS. 6 and 7, a screw 55 is provided below the spool 4 as an operating section. This screw 55 is connected to a bush 5 attached to the main body 1a of the camera l.
6, and the tip 55a of the screw 55 can come into contact with the contact piece of the switch 47.

In the above configuration, when the screw 55 is screwed in as shown in FIG. 7, its tip 55a presses the contact piece of the switch 47, and the switch 47 is turned on.

When the screw 55 is loosened from the position shown in Fig. 7,
The tip portion 55a separates from the contact piece of the switch 47, and the switch 47 is turned off.

Therefore, according to the fourth embodiment, the operating section of the selector, which does not need to be operated very frequently in a day, is miniaturized and the operating section is disposed inside the camera back 9, so that the operating section can be removed from the outside. Appearance without exposure! ,':+4. +: Not only does it look good, it also avoids any negative impact on space or operation on other various operating members.

In the fourth embodiment, instead of providing the screw 55, two pins of different lengths are used, and the switch 47 is operated by using one of the two pins. It's okay.

Next, a fifth embodiment of the present invention will be described based on FIGS. 8, 9, and 10.

In this embodiment, a second film detection switch 60 is provided as a second detection means, and when the selector 48 is switched to the N position side, when the second film detection switch 60 is switched from on to off. The configuration is such that an earlier rewind stop signal is output. In this example, the film rewinding section, clutch mechanism, opening/closing mechanism, and locking mechanism are as follows:
5.6.7.8.10.11 in FIG. 1, and the circuits other than the rewind stop signal generator 101 are the same as in FIG. 2, so these are shown in FIGS. Illustration is omitted in the figure.

The base of the second film detection switch 60 is fixed to the switch lever 61, and the base of a detection pin 62 is fixed to the lower end of the contact piece 60a.

The switch lever 61 is pivotally supported by a shaft 61a, biased counterclockwise by a spring member 63, and locked by a stopper 64 at the original position shown in FIG.

The switch lever 61 also includes an engaging pin 6 that contacts the lower end 42c of the switch lever 42 and transmits clockwise rotation of the lever 42 to the switch lever 61.
5 suddenly lost 1.

The tip of the detection pin 62 is located at the lower edge F2 of the film F when the switch lever 61 is rotated clockwise from the position shown in the figure.
When the end portion of the lower edge portion F2 passes through, it can protrude into the through hole 2b of the pressure plate 2 by its own biasing force. Contact pieces 60a, 6 of second film detection switch 60
0b is off in the state shown in the figure, and turns on when the tip of the detection pin 62 comes into contact with the film F.

As described in the first embodiment, the position of the detection pin 46 and the through hole 2a is determined by the inertia of the motor M.
The entrance part P2 of the cartridge P is transferred by a distance longer than the transfer distance of
located far away from.

On the other hand, as shown in FIG. 1O, the position of the detection bin 6o and the through hole 2b is shifted by a distance S shorter than the transport distance of the film F due to the inertia of the motor M at the entrance P2 of the cartridge P.
located far away from.

As shown in FIGS. 8 and 9, a changeover switch 66 that is switched in conjunction with the selector 48 is provided in place of the switch 47. This changeover switch 66 includes an insulating plate 67 that rotates integrally with the selector 48, and an insulating plate 67 that rotates integrally with the selector 48.
7 and a switch board 69, on which a conductor pattern 66 is attached.
a, 66b, and 66c are formed. selector 48
When the selector 48 is switched to the T side, the conductor patterns 66a and 66b are short-circuited by the brush 68, and when the selector 48 is switched to the N side, the conductor patterns 66a and 66c are short-circuited.

The conductor pattern 66a is connected to the pull-up resistor 102 of the rewind signal generating section 101, the conductor pattern 66b is connected to the film detection switch 45, and the conductor pattern 66c is connected to the second film detection switch 60. In the fifth embodiment having the above configuration, when the selector 48 is switched to the T position side, the conductor patterns 66a and 66b of the changeover switch 66 are short-circuited, and the film detection switch 45 is pulled up via the changeover switch 66. resistance 1
Connected to 02. Therefore, when rewinding is performed in this state, the terminal end FIO of the upper part F1 of the film F passes the tip of the detection bin 46 and the film detection switch 45 is activated, as in the case of each of the above embodiments. When turned off, an L level rewind stop signal is sent to the inverter 104.
is output to the AND gate 107, the power to the motor M is cut off, and the motor M is stopped.

Next, when the selector '48 is switched to the N position, the conductor patterns 66b and 66c of the changeover switch 66 are short-circuited, and the second film detection switch 60 is connected to the pull-up resistor 102 via the changeover switch 66. be done. Therefore, when rewinding is performed in this state, when the terminal end F20 of the lower edge F2 passes the detection bin 60, the second film detection switch 6o, which had been in contact with the lower edge F2 up until this point, is The tip of the contact piece 6 is located in the through hole 2b of the pressure plate 2.
The contact piece Boa moves away from the contact piece 60b, and the second film detection switch 60 is turned off. When the second film detection switch 2,060 is turned off, an L level rewind stop signal is sent to the inverter 10.
4 to the AND gate 107, and the power to the motor M is cut off. At this time, the terminal end F20 of the lower edge F2 is located at a distance S from the entrance P2 of the cartridge P, but this distance S is shorter than the transport distance of the film F due to the inertia of the motor M. The film F is further rewound, the end portion F20 is completely wound into the cartridge P, and the motor M is stopped.

If the transport distance of the film F due to the inertia of the motor M is very short, a capacitor 121 is connected in parallel to the second film detection switch 60, as shown by the broken line in FIG.
is connected, and after the second film detection switch 60 is turned off, the L level rewind stop F signal is output to the inverter 10.
The delay time from 4 to the AND gate) 107 is created by a time constant circuit consisting of a pull-up resistor 102 and a capacitor 121, and the entire termination section F20 is connected to the cartridge P.
It may be configured to ensure that everything is rolled up inside.

According to the fifth embodiment, the two film detection switches are provided at different positions, and switching between the two detection switches is performed by the changeover switch 66, so that the circuit configuration of the rewind signal generation section 101 is changed. It becomes extremely easy.

Next, a sixth embodiment of the present invention will be described based on FIGS. 11 to 14.

This embodiment includes a film detection switch 71, a second film detection switch 72, and a changeover switch.

Cheer 0 and selector 73 are provided at 3M9 bias. In addition, in this embodiment, the film winding mechanism,
The film rewinding mechanism, rewinding operation section, clutch mechanism, opening/closing mechanism, and locking mechanism are respectively shown in 5.6.7 in FIG.
8, 10, and 11, illustration of these is omitted in FIG.

As shown in FIG. 11, the base of the film detection switch 71 is fixed to the back cover 9, and its contact piece 71a is in contact with the arm 74. The arm 74 is supported by a rotating part on a shaft 75 fixed to the back cover 9, and also supports a roller 76.

While the roller 76 is in contact with the film F, the contact piece 71
a is separated from the contact piece 71b, the film detection switch 71 is off, and when the end of the film F passes the roller 76, the arm 74 is moved from the position shown in the figure to the center of the axis 75 due to the biasing force of the contact piece 71a. Because it rotates counterclockwise,
The film detection switch 71 is turned on when the contact piece 71a comes into contact with the contact piece 71b.

The base of the second film detection switch 72 is fixed to the pressure plate 2, and a detection bottle 77 is attached to the tip of the contact piece 72a.
is fixed. The tip of the detection bottle 77 passes through the through hole 2C formed in the pressure plate 2 and passes through the lower edge F2 of the film F.
The contact piece 72a is in contact with the contact piece 72a. Detection bottle 7
While the tip of 7 is in contact with the lower edge F2, the section 72a
is separated from the section 72b and the second film detection switch 7
2 is turned off, and when the terminal end of the lower edge F2 passes the tip of the detection bottle 77, the section 72a contacts the section 72b and the second film detection switch 72 is turned on. .

The selector 73 is switchable between the T position and the N position.
It is supported by 9.

The changeover switch 70 includes a substrate 70a fixed to the back cover 9, conductor parts 70b and 70c, and a conductive brush 70d that moves in conjunction with the selector 73. The relationship between the conductive brush 70d and the conductor parts 70b and 70c is as shown in Figure 1. When the selector 73 is switched to the N position, the tip of the conductive brush 70d is located outside the conductor part 70b and 7°C. When the changeover switch 7o is turned off and the selector 73 is switched to the T position, the tip of the conductive brush 70d is connected to the conductor portion 70b and the conductor portion 7.
0c is short-circuited to turn on the changeover switch 7o.

As shown in FIGS. 12 and 13, the changeover switch 7
0 and the film detection switch 71 are connected in series, and a second film detection switch 72 is connected between both terminals of the changeover switch 70 and the film detection switch 71. Both terminals of the second film detection switch 72 are connected to a communication terminal 78, which can come into contact with a terminal 79 on the main body la side of the camera 1 when the back cover 9 is closed. A pull-up resistor 122 is connected to one side of the terminal 79, and the connection point between the terminal 79 and the pull-up resistor 122 is AN.
It is connected to the input terminal of D gate 107.

Furthermore, the roller 76 and the detection bin 77
It is provided in the same position as the film detection bins 46 and 62 in the embodiment.

In the sixth embodiment having the above configuration, the selector 7
3 to the T position side, the conductive brush 70d short-circuits the conductor part 70b and the conductor part 70c, and the changeover switch 7
0 is turned on. When rewinding is performed in this state, the film detection switch 71 is turned off until the end of the film F passes the roller 76, and the film F
When the terminal end of the film passes through the roller 76, the film detection switch 71 is turned on, so the terminal 79 and the pull-up resistor 1
The potential at the connection point with 22 becomes L level, this L level rewinding stop signal is sent to AND gate 107, and power to motor M is cut off.

Next, when the selector 73 is switched to the N position,
The conductive brush 70d does not come into contact with the conductor portions 70b and 70c, and the changeover switch 70 is turned off. When rewinding is performed in this state, the second film detection switch 72 is pressed until the end of the film F passes the detection bin 77.
is off, and when the end of the film F passes the detection bin 77, the second film detection switch 72 is turned on, so the potential at the connection point between the terminal 79 and the pull-up resistor 122 becomes L level, and this An L-level rewind stop signal is sent to the AND game 107, and the power to the motor M is cut off.

Note that if the transport distance of the film F due to the inertia of the motor M is very short, the 14th rI! As shown by J, a capacitor 124 is connected in parallel to the changeover switch 70 and the film detection switch 71, and the connection terminal 7
8 and the second film detection switch 72.
3 is connected, and after the second film detection switch 72 is turned off, an L level rewind stop signal is output to the AND gate 10.
The delay time until the signal is output to the terminal F20 is created by a time constant circuit consisting of a resistor 123 and a capacitor 124.
It may be configured such that all of them are reliably rolled into the cartridge P.

According to the sixth embodiment, the film detection switch 71 constituting the first detection means, the second film detection switch 72 constituting the second detection means, the changeover switch 70 and the selector 73 constituting the switching means. Since it is provided on the back cover 9 side, the space of the main body portion 1a of the camera 1 can be restricted.

In this embodiment, the back cover 9 may be a removable part on the main body la of the camera 1. In that case, stop-related devices such as switches 7o, 71, 72, terminal 78, etc. are not provided in place of the above-mentioned ySri9. One possibility is to attach the back cover to the camera. When a back cover without a stop-related device is attached in this way, the camera of the above embodiment has a terminal 79 on the camera body that can be connected to the terminal 79 no matter what state the film is in.
Since there is no short circuit, rewinding will not stop automatically.
Therefore, in this case, rewinding must be stopped manually.

(Effects of the Invention) According to the automatic rewinding stop device for a camera according to the present invention, the rewinding operation is automatically stopped while leaving the tongue of the film slightly outside the cartridge.

You can select a function that winds all the film into the cartridge and automatically stops the rewinding operation without leaving the tongue outside the cartridge.

[Brief explanation of drawings]

1 and 2 show a first embodiment of the present invention, in which FIG. 1 is a perspective view of the inside of the camera, FIG. 2 is a circuit diagram, and FIG.
The figure is a circuit diagram showing a second embodiment of the present invention, FIGS. 4 and 5 show a third embodiment of the present invention, FIG. 4 is a perspective view of the inside of the camera, and FIG. 5 is a circuit diagram. , 6 and 7 show a fourth embodiment of the present invention, and FIG. 6 is a plan view,
FIG. 7 is a sectional view taken along the line ■-■ in FIG. 6, FIGS. 8 to 10 show a fifth embodiment of the present invention, FIG. 8 is a perspective view of the inside of the camera, and FIG. 9 is a circuit diagram. Figure 10 is an explanatory diagram,
1 to 14 show a sixth embodiment of the present invention,
Figure 11 shows the inside of the camera. Figure 1, Figure 2, Figure 3, Figure 7, Figure 8, Figure 11, Figure 12.

Claims (1)

[Claims] In still cameras that use cartridge film that requires rewinding after shooting, the electric motor that drives the rewind and the part of the film that is pulled out from the cartridge are located in a specific part of the film path inside the camera. at least one detection device for detecting whether the
a control circuit for controlling the electric motor; and a signal generating means for emitting a signal at a point in time when rewinding has progressed further from a point in time when the detection device detects that the film is no longer present during rewinding, A rewinding device characterized in that it has a switching device that changes the operation of a control circuit in relation to either a signal from the output of the device or a signal from the signal generating device to switch the timing at which the electric motor during the rewinding operation is stopped. Automatic stop device.