JPH0459623B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a camera having a feature in film feeding operation during film loading.

With conventional cameras, when loading film, the position of the first frame on the film varies depending on the way the film is pulled out from the cartridge and the way the film is initially fed, in other words, from the end of the film to the first frame. The distance will vary each time you reload. This brings about the following disadvantages.

That is, first of all, even when using film with the same number of shots, the number of shots that can be taken varies to some extent from time to time. For example, even if you use the same 24-shot film, you may sometimes be able to take 25 shots, and other times you may only be able to take 24 shots. Therefore, it is not possible to know in advance the number of frames that can actually be photographed.

Another disadvantage is as follows. There are times when there is a film in the camera that still has frames that can be photographed, and it is desired to temporarily replace it with a different type of film. For example, your camera currently has film with a film sensitivity of ISO 100, but since the illuminance of the subject is low, you may need to use a film with a higher sensitivity.
If you want to change to ISO400 film,
This may be the case when it is desired to replace negative film with reversal film depending on the subject or the intention of photographing. In such a case, the film currently in the camera must be rewound into the cartridge and taken out. There is still a part of the film that can be photographed, so to photograph that part, load the film into the camera again and feed the film for the number of frames that have already been photographed. However, at this time, there is a possibility that the frame position of the first frame may be different between when it was loaded in the camera and when it is newly loaded. In order to avoid exposure, it is necessary to perform a certain amount of extra feed. This creates a gap between the previously photographed frame and the newly photographed frame, which not only wastes film but also causes the intervals between the photographed frames to be uneven. arise.

In order to solve such problems, the camera of the present invention has a first mode in which the film can be wound in the direction of pulling the film out of the cartridge, and a second mode in which the film can be rewound in the direction of pulling it back into the cartridge. a detection means for detecting that the film has been rewound to the film loading position in the second mode; and a detection means for detecting that the film has been rewound to the film loading position in the second mode; It includes means for switching from the second mode to the first mode.

With this configuration, after loading the film into the camera, during the preparatory operation for transporting the film to the first frame, the film is first moved to the film loading position (i.e., the film is only taken up and hooked onto the spool; Since the film can be rewound to the unwound state (unwound) and then fed in the forward direction from that position, film feeding always starts from a fixed reference position, so that the position of the first frame is always the same. It becomes constant.

FIG. 1 shows an embodiment of the invention. The configuration will be explained below with reference to the figures. A hoisting lever 1 that can be operated from the outside is provided with a disc 2 having a pin 2a coaxially and integrally therewith. This pin 2a enters into the elongated hole 4c of the slip ring 4, and is configured to turn on the hoisting switch SW ₄ when a left turning force is applied to the hoisting lever 1 due to its circumferential play. This ON signal is output through the conductive parts 4a, 4b and the brush 3. 3 rollers 5a, 3 cams 5
The clutch 5 is configured to transmit only the rotation in the left (counterclockwise) direction from the hoisting lever 1 to the gear 6, and not to transmit the rotation in the right (clockwise) direction to the gear 6. .

The gear 6 is connected to the first sprocket gear 12 via gears 7, 8, and 9, and is also connected to the idle gear 10.
It is also connected to the second sprocket gear 13 via.

A sprocket shaft 14 passes through the first sprocket gear 12 and the second sprocket gear 13.
A pin 14b is provided on the top, and a first
Notch 12a, 13a of one of the second sprocket gears 12, 13 (one of the plurality)
can be engaged with. Also, on the sprocket shaft 14 is a pin 1 that fits into the elongated hole 11b of the one-tooth gear 11.
4a, and a pin 14c that fits into the elongated hole 15b of the sprocket 15 is provided.

A gear portion 15a is integrally provided on the sprocket 15, and this gear portion is connected to a gear 47 via a gear 21 and an idle gear 49. Further, the first and second winding upper limit plates 16 and 17, which rotate integrally with the sprocket 15, have notches 16a and 17a, respectively. This notch 16
claw portions 33a that can be engaged with a and 17a, respectively;
first and second winding upper limit levers 33 having 34a;
34 are independently rotatable about axis 330. One end 33d of the first winding limit lever can come into contact with a tapered portion 23b provided at the lower end of the idle shaft 23, and the pin 33c can operate the switch _SW1 . Further, one end 34d of the second hoisting limit lever 34 can come into contact with the reverse tapered portion 23c of the idle shaft 23, and the pin 34c can operate the switch _SW2 .

The switch _SW1 and the switch _SW2 are connected in parallel as shown in FIG. switch here
SW ₇ is a release switch that is linked to the press of a release button (not shown), and electromagnet Mg ₂ is a release magnet that starts the camera's shooting operation.

Returning to FIG. 1, reference numeral 29 is a mode switching knob that can be operated from the outside, and a first cam 30 and a second cam 31 are integrally provided, and corresponds to the first and second winding upper limit levers 33 and 34. come into contact with This first and second
The positional relationship between the cams 30 and 31 is as follows. The large diameter portion 31a of the second cam 31 comes into contact with the second winding upper limit lever 34 at the position where the character "Correct" on the mode switching knob 29 corresponds to the index 32; The large diameter portion 30a of the first cam 30 comes into contact with the first hoisting limit lever 33. Also, 35 and 36 are the first and second
Each of the hoisting limit levers 33 and 34 is a spring that provides left rotation. The plate 18 is the sprocket shaft 1
4 in the thrust direction only, and at both ends thereof, the idle shaft 23 and the lower part of the rewind interlocking shaft 48 are supported so as to be interlocked only in the thrust direction. The back cover interlocking lever 38 is rotatably supported by a shaft 38a, has one end 38c that can come into contact with the protrusion 60b of the back cover 60, and has a spring 4
0 in the left rotation direction. A lever 37 that can engage with the stepped portion 14d of the sprocket shaft 14 is supported by a shaft 38b on a back cover interlocking lever 38.
A spring 39 imparts levorotation. switch
SW ₃ is a back cover interlocking switch operated by a pin 60c of the back cover 60.

The sprocket shaft 14 further has a tapered portion 14e that can come into contact with one end 42b of the lever 42, and has an R button 14f that can be pressed from the outside, and is urged downward by a leaf spring 19 as a whole. The lever 42 and the lever 41 are rotatably supported by a shaft 41a, are attracted to each other by a spring 44, and are biased as a whole in the counterclockwise direction by a spring 43. The lever 41 also has an armature 41c that can be attached to the magnet Mg ₁ and a magnet switch SW ₅ .
It has a pin 41d that turns ON and OFF. This magnet Mg ₁ has a built-in permanent magnet, and its attraction force is reduced when it is energized.

Gear part 1 that rotates integrally with sprocket 15
The gear 21 connected to the gear 5a has a notch 21a at the top.
It has a plurality of pins 23a of the idle shaft 23 and can be engaged with the pin 23a of the idle shaft 23. Opposing this notch 21a, the pin 2
A cylinder 20 having a plurality of notches 20a that can be engaged with the cylinders 3a is fixed to a camera body (not shown). The idle shaft 23 further includes an elongated hole 22 in the gear 22.
It has a pin 23d that enters into a, and also has one end 33d of the first winding limit lever 33 as described above.
and a reverse taper portion 2 that can come into contact with one end 34d of the second winding upper limit lever 34.
It has 3c. A spool gear 24 that meshes with the gear 22 is integral with a spool shaft 25, and the spool shaft 25 and spool 26 are connected via a friction mechanism (not shown).

The internal structure of the spool 26 is shown in FIG.
Light emitting diode (LED) 27 and prism 27a
is supported by a hollow body fixed to the camera body and is recessed into the spool 26. A hole 26c is provided at the center of the convex portion 26b into which a hole for loading an information hole film to be described later is hooked. It is configured to sense the light emitted from the light receiving element 28 and the LED 27, reflected by the prism 27a, and passed through the hole 26c.

Returning to Figure 1, gear part 1 of sprocket 15
5a and the gear 4 interlocked via the idle gear 49.
7 has a plurality of notches 47a that can be engaged with the pins 48b of the rewinding interlocking shaft 48. The pulley 46 has an elongated hole 46a and a pin 48a of the rewinding interlocking shaft 48.
It is configured to be interlocked only in the rotational direction. The rewind pulley 62 is connected to the pulley 46 via a timing belt 61.

The rewinding shaft 63 that engages with the film cartridge shaft 201a has a friction mechanism similar to the spool shaft 25 and the spool 26 between it and the rewinding gear 62. The lever 68 that comes into contact with the cartridge 201 is given dextrorotation by a spring 69, and is configured such that one end 68b can turn on the cartridge switch SW ₆ when the lever 68 rotates to the left.

1-tooth gear 1 rotating together with sprocket shaft 14
The number counting gear 51 interlocked with the lever 51 is supported by a shaft 53b on a lever 53 which is rotatable about a shaft 53c. The sheet count plate 50 and the sheet count gear 51 rotate integrally. These are given levorotatory properties by springs 52. Also, the shaft 53 on the lever 53
In addition, a gear 55 and a lever 57 are each rotatably supported on the shaft. Lever 57 and lever 53
The spring 57b applied between the lever 53 and the spring 57c urges the lever 53 in the clockwise direction.
57 and both are biased in the left rotation direction. Further, the lever 57 is provided with a pin 57a, so that it can come into contact with a convex portion 60a of the back cover 60. A lever 45 rotatable about a shaft 45a is given left rotation by a spring 45d, a pin 45c contacts as a cam follower of a sheet counting cam 58, and a pin 45b contacts the first and second winding limit levers 33 and 34. One end 33
b, 34b.

The sheet counting cam 58 is integral with the shaft 56a and the gear 56, and is connected to the sheet counting gear 51 via the gear 55. These interlocking relationships are based on sprocket shaft 1.
Corresponding to one rotation of 4, the number plate 50 is advanced by one frame, and the number plate 50 is also moved to S (start position mark).
During the rotation from 0 to 0 (the mark indicating the number of shots taken), the pin 45c faces the small diameter portion 58a of the number counting cam 58. Furthermore, when the sprocket shaft 14 rotates in the opposite direction, the number plate 50 rotates in a direction in which one frame is subtracted, but S
The pin 58b of the sheet counting cam 58 is brought into contact with the stopper 70 to prevent the number of sheets from falling below.

64 and 65 face each other with the film 202 as a boundary, and are for reading the film information hole 204.
LED ₁ is a pair of light receiving elements, and 66 and 67 are a similar pair of LED and light receiving elements for reading the perforation 203 of the film. Two pairs of LEDs and light receiving elements 64, 65 and 66, 67 for reading film information are shown in FIG.
As shown in FIG. 5B, a complex and dense mechanical section 80a such as a control system and a charge system of the shutter 80 is placed on the opposite side of the aperture 80b. The reason for this is that in ordinary cameras, other mechanisms are rarely arranged in the space on the opposite side of the aperture of the shutter mechanism section 80a.

Next, a film having information holes used in the camera of the present invention will be explained with reference to FIG.

The 35 mm film 202 is shown with the emulsion side as the back side. The perforations 203 are arranged in one row at the top and bottom in the figure. Information holes 204 are a group of round holes that represent film information by their presence or absence. Further, 205 is a heart-shaped film positioning hole. The tongue portion 205a has a film convex portion 26.
b (Fig. 1). The section where the information hole is arranged is from the margin on the left of perforation 203a, which is distanced by length A from the positioning hole 205, and perflation 203b, which is distanced by length B, using the space between each perforation. up to the left margin. The position of this information hole is 1 from the film loading.
It is assumed that the lengths A and B are limited so as to be provided between the frames. The information given is the film's ASA/ISO sensitivity information and the number of shots that can be taken, and these are given in binary code or arithmetic code. It is assumed that the information is used as an information start signal that is scattered in the area.

FIG. 6 is a block diagram showing an embodiment of an electric circuit corresponding to the mechanical system of FIG. 1.

The battery 100 supplies power to a known photometry circuit and exposure control circuit through an output terminal 101, and also to power supply control circuits 102 and 11 through a back lid interlocking switch _SW3 , a cartridge switch _SW6 , and a power supply line Vcc.
3 is applied. Power supply control circuits 102 and 113 control power supply to circuit systems 112 and 126. The power supply control circuit 102 is controlled by the output of an SR (set-reset) flip-flop 103. In the SR flip-flop 103, the output of an AND gate 104 is connected to a set input terminal, and the output of an OR gate 105 is connected to a reset terminal. AND gate 104 receives the outputs of winding switch SW ₄ and S-R flip-flop 128 as inputs. The first reset circuit 116 is activated to generate a first reset pulse when the back cover interlocking switch _SW3 and the cartridge switch _SW6 are turned on. S-
R flip-flop 128 is a magnetic switch
The output of SW ₅ is applied to the set input terminal, and the first reset pulse is applied to the reset input terminal. OR
The gate 105 receives the output of the magnetic switch _SW5 and the first reset pulse. Similarly, the power supply control circuit 113 and the S-R flip-flop 114
controlled by. S-R flip-flop 1
14, the output of the magnetic switch _SW5 is applied to the set input terminal, and the output of the OR gate 115 is applied to the reset input terminal. The OR gate 115 receives the first reset pulse as one input. In the circuit system 112, when the photodiode 28 receives the light emitted from the LED 27, the amplifier circuit 106 amplifies the signal, shapes the waveform, and outputs the signal. Amplifier circuit 1
The one-shot multivibrator 107 outputs a trigger pulse according to the time constants of the resistor 109 and capacitor 110 in response to the output signal of 06. The drive circuit 111 is adapted to energize the magnet Mg ₁ while the trigger pulse is occurring. Further, the magnet switch SW ₅ is configured to be turned off when the magnet Mg ₁ is energized. Next, in the circuit system 126, the amplifier circuits 117 and 118 are respectively
Perforation holes and information holes on the film are detected by LEDs 65, 67 and light receiving elements 64, 66, and the waveforms are shaped and output. A differential amplifier 119, which receives the outputs of the amplifier circuits 117 and 119, outputs only the information hole signal. S-R flip-flop 120 is set at the output of differential amplifier 119 which detects the first information hole. During this set, the AND gate 121 is opened.
The output of amplifier 118 is input to AND gate 121. The output of the AND gate 121 is input to an information acquisition counter 122 and an AND gate 123. The information acquisition counter 122 counts the number of information holes because the range of information holes on the film is predetermined by the number of perforations (the number of perforations that exist within the length B in FIG. 5). It is something to do. Information intake counter 122
A first output of is applied to AND gate 123 and a second output is applied to OR gate 115. The first output is output when the predetermined number of perforations existing in the length B of the film 202 is counted, and the second output is output when the number of perforations following the predetermined perforation is counted. AND gate 12 until the first output is output.
3 is open. Therefore, AND gate 12
A perflation detection pulse is output every time the amplifier circuit 118 outputs an output corresponding to the perflation present in the length B of the third film 203. The data register 124 inputs the output of the amplifier circuit 119, that is, the film information signal from the film information hole, and the perflation detection pulse of the AND gate 123, respectively. The data register 124 sequentially designates a storage address each time a perflation detection pulse is output, and stores the presence or absence of the information hole signal from the operational amplifier 119 at the designated address. The second reset circuit 125 initializes the flip-flop 120 and the data register 124 in response to the start of power supply to the circuit system 126.

Next, the operation of the embodiment will be explained. First, the case where the mode switching knob 29 is in the "positive" position will be described.
Align the positioning hole 205 of the film with one of the protrusions 26b of the spool 26 and push it in. After that, when the shaft 201a of the cartridge 201 is inserted into the rewinding shaft 63, the cartridge 201 rotates the lever 68 to the left against the spring 69, and the cartridge switch SW ₆
Turn on. In this state, the back cover 60 is in an open state, so the convex portion 60b of the back cover 60 is not in contact with the lever 38. Therefore, the lever 38 and the lever 37 are rotated to the left by the force of the spring 40, and the lever 37 is rotated between the sprocket and the shaft 1.
Since the sprocket shaft does not come into contact with the stepped portion 14d of No. 4, both the idle shaft 23 and the rewind interlocking shaft 48 are pushed down by the force of the leaf spring 19.
At this time, the pin 14b of the sprocket shaft 14 is engaged with the notch 13a of the first sprocket gear 13, and the pin 23a of the idle shaft 23 is engaged with the notch 13a of the first sprocket gear 13.
It engages with the notch 21a of. Further, the pin 48b of the rewinding interlocking shaft 48 is connected to the notch 47a of the gear 47.
has been disengaged from the Therefore, when the winding lever 1 is rotated to the left, this rotational movement causes the spool shaft 25 to rotate to the left via the gears 6, 10, 13, 15a, 21, 22, and 24 in sequence. As a result, the film 202 is pulled out from the cartridge 201, and the film 202 is pulled out from the center hole 26c of the protrusion 26b of the spool.
is wound around the spool 26 so as to cover it. This action of turning the winding lever 1 to the left is often performed when loading a film to check whether the film is being fed properly. Next, when the back cover 60 is closed, the convex portion 60a comes into contact with the pin 57a, and the lever 57 is rotated to the right together with the lever 53 against the spring 57c.
1 is meshed with the 1-tooth gear 11. At this time, the number counter plate 50 is brought to a position where the index 54 indicates S due to the force of the spring 52. Further, the convex portion 60b of the back cover 60 is located at one end 38c of the back cover interlocking lever 38.
By pushing the lever 38 together with the lever 37 around the shaft 38a, the lever 38 is rotated to the right and the sprocket shaft 1 is rotated.
4 through the stepped portion 14d, and at the same time turn on the back cover interlock switch _SW3 . At this time, since the armature 41c is attracted by the permanent magnet Mg ₁ , the levers 41, 42
is not rotated to the left by the spring 43. Therefore, magnetic switch SW ₅ is ON. By moving the sprocket shaft 14 upward, the pin 14b
is disengaged from the first sprocket gear 13 and engaged with the notch 12a of the second sprocket gear 12. Further, since the plate 18 also rises integrally, the pin 48b of the rewinding interlocking shaft 48 engages with the notch 47a of the gear 47. Furthermore, idle axis 2
The third pin 23a disengages from the gear 21 and engages with the notch 20a of the cylinder 20. At the same time, the tapered portion 23b disables engagement between the first winding upper limit lever 33 and the first winding upper limit plate 16, and the reverse tapered portion 23c escapes from the second winding upper limit lever 34 and The winding limit plate 17 and the claw portion 34a can be engaged with each other. However, at this point lever 4
The pin 45c of No. 5 is the small diameter portion 58a of the sheet counting cam 58.
By turning the lever 45 to the left, the pin 45
b prevents the first and second winding upper limit levers 33 and 34 from turning to the left, and the large diameter portion 31a of the second cam 31 also prevents the left rotation, so that the second winding upper limiter plate 1
The notch 17a of No. 7 and the claw 34a are not engaged with each other. On the other hand, the battery 100 is connected to the power supply control circuits 102 and 113 by turning on the cartridge switch SW ₆ and the back cover interlocking switch SW ₃ , and at the same time, the first reset circuit 116 generates a first reset pulse. Therefore, the flip-flops 103 and 114 are
It is reset via OR gates 105 and 115. Therefore, the power supply control circuits 102 and 113 do not operate. Also, since the magnetic switch SW ₅ is ON, the flip-flop 128 is also reset by the first reset pulse, and the AND gate 1 is reset.
04 is opened.

In this state, when the hoisting lever 1 is turned to the left, the hoisting switch SW ₄ is turned on, and while this state is maintained, the gear 12 is turned to the right via gears 6 to 9, and at the same time, the hoisting switch SW 4 is turned to the right via gears 6 to 9. Set gear 13 to the right. As mentioned above, at this time, the pin 14b of the sprocket shaft 14 is engaged with the gear 12, so the sprocket shaft is rotated to the right side and gear 15.
a. Gear 47 is also applied to the right via gear 49. Again, as mentioned above, the pin 48b of the rewinding interlocking shaft 48
is engaged with the notch 47a of the gear 47, so
Since the rewinding pulley 62 is installed on the right side via the pulley 46 and the timing belt 61, the film 2
Feeding in the rewinding direction of 02 is performed. Furthermore, the gear 21 that meshes with the gear 15a is also rotated to the left, but since the pin 23a of the idle shaft 23 is disengaged from the gear 21, it simply idles.
Since the pin 23a is engaged with the cylinder 20, the spool gear 24 is locked. In this way, the film 202 is moved in the unwinding direction (in the first direction) against the friction between the spool shaft 25 and the spool 26.
(left side in the figure).

At the same time, the one-tooth gear 11 is also installed on the right side. However, since the pin 58b of the interlocking sheet counting cam 58 is in contact with the stopper 70, the rotational force of the one-tooth gear 11 rotates the lever 53 to the left, causing the sheet counting gear 51 to escape. The number board 50 maintains the S position.

Now, when the winding switch SW ₄ is turned on as described above by operating the winding lever 1, the magnet Mg ₁ attracts the armature 41c by the permanent magnet, and the magnet switch SW ₅ is turned on. Therefore, flip-flop 103 is set by the output of AND gate 104. The power supply control circuit 102 is controlled by the flip-flop 103 output.
starts supplying power to the circuit system 112.

When power is supplied to the circuit system 112, the LED 27
emits light, but at this time, when the film is loaded, the convex portion 26b into which the positioning hole 205 is attached is connected to the light receiving element 2.
8, the light does not reach the light receiving element because the film wound around the spool 26 blocks the other holes 26c. Further, the film 202 is fed in the unwinding direction, and the positioning hole 20
Only when the convex portion 26b to which the LED 5 is attached faces the light receiving element 28, the light receiving element 28 detects the light emission of the LED 27, and the amplifier circuit 106 transmits its output to the monostable multivibrator 107. A trigger pulse corresponding to the time constant of a resistor 109 and a capacitor 110 is generated in the monostable multivibrator 107 . While this trigger pulse is being generated, the drive circuit 111 energizes the magnet _Mg1 . By this energization, the armature 41c is released from its adsorption state, and the lever 41 rotates to the left together with the lever 42 due to the force of the spring 43. As a result, the pin 41b resists the spring 39 and moves the lever 37 to the shaft 38.
Since it is applied to the right at step b, the engagement with the stepped portion 14d of the sprocket shaft 14 is released. Twist leaf spring 19
The force causes the sprocket shaft 14 to descend, and at this time the reverse taper portion 14e moves the levers 41 and 42 to the right until the armature 41c is attracted to the magnet Mg ₁ , and the pin 14b moves the levers 41 and 42 to the right until the armature 41c is attracted to the magnet Mg 1.
The first sprocket gear 1 is disengaged from the first sprocket gear 1.
3. Rewinding interlocking shaft 48, idle shaft 2
3 also descends at the same time, the pin 48b is connected to the gear 47.
The pin 23a is disengaged from the notch 47a, and the pin 23a
is disengaged from the notch 20a of the cylinder 20 and engaged with the notch 21a of the gear 21.

During a series of operations starting from the detection of light emission by the LED 28, the magnetic switch SW ₅ is temporarily turned OFF by turning the lever 41 to the left, and this signal is
Flip-flop 10 via OR gate 105
Reset 3. Therefore, the power supply control circuit 102
stops power supply to the circuit system 112. Also, since the flip-flop 128 is set by turning off the magnetic switch _SW5 , the AND gate 1
04 is closed. Therefore, the flip-flop 103 will not be set again even if the winding switch SW ₄ is turned ON or OFF when the winding lever 1 is rotated to the left next time. Further activation of magnetic switch SW ₅ is irrelevant. In addition, magnetic switch SW ₅
With the OFF state, the flip-flop 114 is set. Therefore, the power supply control circuit starts supplying power from the battery 100 to the circuit system 126. Then, the LEDs 65 and 67 start emitting light. At this point, the sprocket shaft 14 is lowered as described above, and the operation of the winding lever 1
5. Since the spool 16 is switched to rotate to the left, the film 202 is moved to the cartridge 201.
The film is fed in the direction in which the film is pulled out from the film, that is, in the forward direction. And perflation 20
3 is the detection part (photocoupler) 64, 65 and 6
6 and 67, amplifier circuits 117 and 118 output signals for each perforation. There is a film information hole 2 in the film length A area.
04, both amplifier circuits 117 and 118 output pulse signals for each perflation. However, since the common mode signal is removed by the differential amplifier 119, no signal is output from the differential amplifier 119 in this length A region. Therefore, flip-flop 120 is in a reset state. The output of flip-flop 120 causes AND gate 121
is closed, and the output of AND gate 121 does not change. Further, the output of the information acquisition counter 122 is reset by the reset circuit 125, and the AND gate 123 is open due to the output of the counter 122, but the AND gate 121 is closed. Therefore, the pulse signal from the amplifier circuit 118 is not sent to the data register 124, and the data register 124 is not performing a storage operation.

When the first hole of the film information 204 passes through the detection section, the differential amplifier 119 outputs a signal of only the information hole. Therefore, the flip-flop 120 is set and the AND gate 121 is opened. From then on, one pulse is output from the AND gate 121 each time each perforation passes through the detector, and this is counted by the information acquisition counter 122. Ru.

Further, since the output state of the information acquisition counter 122 does not change until it reaches a predetermined count value, the AND gate 123 is open, and the pulse for each perflation is transferred to the data register 12.
4, the storage addresses in the data register 124 are sequentially shifted, and the presence or absence of film information holes, that is, film information, is stored for each perforation pulse.

When the above information acquisition operation progresses and reaches the final perforation number at which a predetermined film information hole 204 exists, the output of the information acquisition counter 122 is inverted. Therefore, the AND gate 123 is closed and the film information is stored in the data register 124, and at the same time, the information is stored in the storage circuit 12.
Transferred to 7. As will be described later, the power supply to the circuit system 126 including the data register 124 is cut off after information acquisition is completed, so the memory circuit 127 is required as a non-volatile memory device.

When the information signal in the data register 124 has been transferred to the storage circuit 127 and one more perforation has been counted, another output of the information acquisition counter 122 outputs a signal to the OR gate 115 to reset the flip-flop 114. Therefore, the power supply control circuit 113 stops power supply to the circuit system 126. In this case, it is sufficient that the power supply to the circuit 126 is stopped after the storage circuit 127 has reliably stored the information signal, so the timing of output generation of the counter 122 to the OR gate 115 is limited to a delay of one perflation. It is not necessary, and more is fine. Since the switches SW ₁ and SW ₂ are turned OFF when reading the film information, there is no risk that the detection system will malfunction due to an erroneous photographing operation.

During the above information hole reading operation, the lever 45
The pin 45c has fallen into the recess 58a of the counting cam 58. During this time, the cam 58 rotates to the right as the film is wound, and the number plate 50 moves to the index 54.
The character opposite turns left from S to O. When the reading of the film information is completed and the film is further fed in the forward direction until it reaches a frame that can be photographed, the pin 45 of the lever 45
c rides on the large diameter portion of the sheet counting cam 58. Therefore, the lever 45 and the right side pin 45b escape, and the first volume upper limit lever 33 is moved to the first volume upper limit plate 1.
The sprocket shaft 14 engages with the notch 16a of the lever after 6 rotations, stops the rotation of the sprocket shaft 14, and turns on the switch _SW1 . As shown in Fig. 2, by turning on switch SW ₁ , it becomes possible to energize release magnet Mg ₂ by turning on release switch SW ₇ , which is linked to pressing the release button, for the first time. . That is, it is only at this point that it becomes possible to start the photographing operation of the camera.

A predetermined photographing operation is performed, and a signal related to its completion, for example, a running signal of the shutter rear curtain, is used.
By a known means (not shown), the first winding limit lever 33 is moved to the right and disengaged from the first winding limit plate 16. Therefore, film feeding becomes possible again, and when the sprocket shaft 14 makes one revolution and the first roll limit plate 16 and the first roll upper limit lever 33 are engaged, the next photographing operation becomes possible.

Next, the rewinding operation when the mode switching knob 29 is in the "positive" position will be described.

When the shooting operation for a predetermined number of images is completed and the R button 14f is pressed from the outside, the spool shaft 14 rises together with the rewinding interlocking shaft 48 and the idle shaft 23, and the lever 37 engages with the stepped portion 14d. . Therefore, as described above, the pin 14b of the spool shaft 14 is connected to the gear 1.
2, the gear 47 of the pin 48b of the rewinding interlocking shaft 48, and the pin 23 of the idle shaft 23.
a engages the cylinder 20. Further, the tapered portion 23b of the idle shaft 23 causes the first hoisting limit lever 33 to be applied to the right, thereby releasing the engagement with the first hoisting limit plate 16.

In this state, when the winding lever 1 is moved to the left, the spool shaft 14 is moved to the right, and in conjunction with this, the rewinding pulley 62 is also moved to the right, so that the film 202 is fed in the rewinding direction. Since the switches SW ₁ and SW ₂ are in the OFF state during this rewinding operation, there is no risk of mistakenly performing a photographing operation, as in the case of reading film information. In this way, the winding lever 1
A rewinding operation is performed by further operating .

Next, the case where the mode switching knob 29 indicates "reverse" will be described, but the explanation will be omitted for those whose operation is similar to the "normal" mode. At this time, the large diameter portion 30a of the first cam 30 comes into contact with the first hoisting restriction lever 33 and prevents the engagement between this and the first hoisting restriction plate 16, while the large diameter portion of the second cam 31 3
1a escapes from the second winding upper limit lever 34.
When the film is loaded and the back cover 60 is closed,
As described above, the sprocket shaft 14, the rewinding interlocking shaft 48, and the idle shaft 23 are displaced upward, and their interlocking relationships with the winding lever 1 change. Also, the second
Although the reverse tapered portion 23c of the idle shaft 23 escapes from the hoisting restriction lever 34, it does not engage with the second hoisting restriction plate 17 because the lever 45 prevents it from rotating to the left.

According to the operation of the winding lever 1, the film is fed in the rewinding direction, and when the light receiving element 28 detects the light emitted from the LED 27, the sprocket shaft 14 is again displaced downward, and the film feeding direction becomes the forward direction. is read.

In this way, the first frame is reached, but in this case, the first cam 30 prevents the first winding upper limit lever 33 and the first winding upper limit plate 16 from engaging from beginning to end. Further film feeding is performed by operating the winding lever 1. Also, during this time, switches SW ₁ and SW ₂ are OFF, so no photographing operation is performed.

After the film has been fed to a predetermined position in this way, when the R button 14f is pressed by an external operation, the sprocket shaft 14 and the rewinding link shaft 4
8. The idle shaft 23 is displaced upward and locked. Therefore, the reverse tapered portion 23c of the idle shaft 23
allows the second hoisting limit lever 34 to rotate to the left. Therefore, by operating the winding lever 1, the film 202 is fed frame by frame in the rewinding direction, and photographing operation becomes possible. In other words, this is a shooting mode in which the film is wound onto the spool and then rewound onto the cartridge as the shooting progresses.

Although this embodiment describes a camera that can switch between a method in which the film is taken sequentially in the direction in which the film is pulled out from the cartridge and a method in which the film is taken in the direction in which the film is wound into the cartridge, the present invention is not limited to this. Needless to say, the effect can be fully demonstrated even if the method is applied to a camera that has only one of the methods without being used.

As described above, in the present invention, in the preparatory operation after loading the film into the camera, the film is rewound to the loading position before the film is fed, and the film is fed in the forward direction from that position. Feeding will always start from a fixed reference position, so to speak, and the first
The position of the pieces is always constant.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of the present invention, Fig. 2 is a circuit diagram showing the configuration of a switch related to the release magnet, Fig. 3 is a sectional view of the spool, and Fig. 4 is a film information detection section and FIG. 5 is a perspective view showing the arrangement with the shutter system, FIG. 5 is a diagram showing an example of an information hole film used in the present invention, and FIG. 6 is a block diagram of an electric circuit according to an embodiment of the present invention. [Explanation of symbols of main parts], detection means...27,
28, switching means...12a, 13a, 14b, 1
4d, 20a, 21a, 23a, 37, 47a,
48b, reading means...64, 65, 66, 67.

Claims (1)

[Claims] 1. A winding device that winds the film in response to a driving force, a rewinding device that rewinds the film in response to a driving force, and a device that detects that the film is at a predetermined reference position in the film length direction within the camera. The camera is equipped with a detection means for generating a predetermined detection signal, and a switching means for switching from a state in which the rewinding means is operated to a state in which the winding means is operated in response to the detection signal. First, upon receiving a driving force, the rewinding means operates, and in response to the detection means detecting that the film has reached the reference position due to the rewinding and generates a detection signal, the switching means operates the rewinding means. A camera characterized by switching.