JPS58211128A - Camera capable of reading film information - Google Patents

Abstract

PURPOSE:To read film information securely even when a film is wound too much, by rewinding the film in the 2nd mode prior to photography, and switching the 2nd mode to the 1st mode through the operation of a detecting means. CONSTITUTION:When some plus character on a mode selector knob 29 corresponds to an index 32, the film can be wound and when some minus character corresponds to the index 32, on the other hand, the film can be rewound. When a film winding lever 1 is operated in the pluse mode, the film 202 is fed in the rewinding direction by the rotation of a rewinding pulley. At this time, once a photodetecting element 28 detects light emitted from a light emitting element 27 in the spool 26, a sprocket shaft 14 is displaced downward to change the film feeding direction into the forward direction, and the film information 204 is read; and the film winding lever 1 is operated later to feed the film further.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a camera that can use a so-called information hole film having degree information and the like.

In recent years, the ISO (ASA) of the film itself has been
A 35-inch film has been designed with a loading positioning hole that provides information such as sensitivity, number of OJ shots, etc., and serves as a reference for reading the information.

Cameras that use this type of film require a mechanism that reads film information during a blank feed operation from loading the film to the position of the first frame. However, in this type of camera, the film information is passed through an information reading mechanism and then the film information is passed through the information reading mechanism when the user performs a certain number of blank feeds to check whether the film is loaded properly. When reading, there is a risk that the information may already be unreadable or that incorrect information may be read.

The present invention solves these drawbacks and makes it possible to reliably read film information even if the user accidentally feeds the film after loading the film and before the reading and 9 operations start. The purpose is to provide cameras.

FIG. 1 shows an embodiment of the invention. The configuration will be explained below with reference to the drawings. A hoisting lever 1 that can be operated from the outside is provided with a disk 2 having a pin 2a coaxially and integrally with the hoisting lever 1. This pin 2a is inserted into the elongated hole 4c of the slip ring 4, and is configured to turn on the hoisting switch SW4 when a left turning force is applied to the hoisting lever 1 by the pin 2a in the circumferential direction. This ON signal is output through the conductive parts 4a, 4b and the brush 3. The clutch 5, which is composed of three rollers 5a and three cams 5b, transmits only the left-handed (counterclockwise) rotation from the hoisting lever 1 to the gear 6, and the right-handed (clockwise) rotation.
The rotation in this direction is not transmitted to the gear 6.

The gear 6 is connected to a first sprocket gear 12 via gears 1.8.9 and also to a second sprocket gear 13 via an idler gear 10.

A pin 14 is mounted on the sprocket shaft 14 passing through the first sprocket gear 12 and the second sprocket gear 13.
b is provided, and one of the notches 12a, 13a (
It is possible to engage one of the number of vipers.

Further, on the sprocket shaft 14, there is a long hole 1 of the one-tooth gear 11.
Elongated hole 1 of bottle 14a1 sprocket 15 that enters 1b
A pin 14c is provided which enters into 5b.

The sprocket 15 is integrally provided with a gear portion 15a, which is connected to the gear 21 and the idle gear 49f.
: Connected to gear 47 via. The first and second winding upper limit plates 16 rotate integrally with the sprocket 15.
．． 11 has notches 16a and 17a, respectively.

First and second winding upper limit levers 33 having claw portions 33a and 34a that can be engaged with the notches 16a and 17a, respectively.
．． 34 are independently rotatable about axis 330. One end 33d of the second limit lever in Volume 1 can come into contact with the tapered portion 23b provided at the lower end of the idle shaft 23, and the idling pin 33c is capable of operating the switch swl. One end 34d of the second winding upper limit lever 34 is connected to the idle shaft 23
The pin 34c can come into contact with the reverse tapered portion 23c of the pin 34c, and the pin 34c can operate the switch SW2.

The switch SWl and switch SW2 are connected in parallel as shown in FIG. Here, switch SW7 is a release switch that is linked to pressing of a release button (not shown).
The electromagnet Mgz is a release magnet that activates the photographing operation of the camera.

Returning to FIG. 1, reference numeral 29 is a mode switching knob that can be operated from the outside, and is provided with a first cam 30 and a second cam 31 in one body, and is in contact with the first and second winding upper limit levers 33 and 34. come into contact with

The positional relationship between the first and second cams 30 and 31 is as follows. The large diameter portion 3 of the second cam 31 is located at the position where the character “correct” on the mode switching knob 29 corresponds to the index 32.
1a comes into contact with the second winding upper limit lever 34.
When the character “reverse” is displayed, the large diameter portion 30a of the first cam 3o is
The winding is restricted and comes into contact with the bar 33. Reference numerals 35 and 36 are springs that give left rotation to the first and second hoisting limit levers 33 and 34, respectively. The plate 18 is interlocked with the sprocket shaft 14 only in the thrust direction, and supports the idle shaft 23 and the lower part of the rewind interlocking shaft 48 at both ends 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 convex portion 60b of the back cover 60, and is biased by a spring 40 in the counterclockwise direction. A lever 37 that can engage with the stepped portion 14d of the sprocket shaft 14 is attached to the shaft 38 on the back cover interlocking lever 38.
b, and is given levorotation by a spring 39. The switch SW3 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 angled 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 has an armature 41c that can be attached to the Macnet Mgl, and a Macnet switch 5w5-iO.
N, and a pin 41d that is turned off. This magnet Mgl has a built-in permanent magnet, and its attraction force is reduced when it is energized.

The carrier 21 connected to the gear part 15a that rotates integrally with the sprocket 15 has a plurality of notches 218 in its upper part, and can be engaged with the pin 23a of the idle shaft 23. A cylinder 20 that faces this notch 21a and has a plurality of notches 20a that can be engaged with pins 23a is fixed to a camera body (not shown). The idle shaft 23 further has a pin 23d that fits into the elongated hole 22a of the carrier 22, and as described above, a tapered portion 23b that can come into contact with one end 33d of the first winding upper limit lever 33, and a second winding upper limit lever 33. It has a reverse tapered portion 23c that can come into contact with one end 34d of the restriction lever 34. The spool carrier 24 that meshes with the carrier 22 is integral with a spool shaft 25, and the spool shaft 25 and the spool 26 are connected via a friction mechanism (not shown).

The internal structure of the spool 26 is shown in FIG. A light emitting diode (L'ED) 27 and a prism 27a are supported by a hollow body fixed to the camera body and are inserted into the spool 26. A hole 26 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.
c is provided. The light receiving element 28 is emitted from the LED 27, is reflected by the prism 27a, and is emitted from the hole 26.
is configured to sense light passing through c.

Returning to FIG. 1, the gear 47 that interlocks with the gear portion 15a of the sprocket 15 via the idler carrier 49 has a plurality of notches 47a that can be engaged with the pin 48b of the rewinding interlocking shaft 48.
has.

The pulley 46 is configured to be interlocked only in the rotational direction by its elongated hole 46a and the pin 48a of the rewind interlocking shaft 48. The % return pulley 62 is connected to the pulley 46 via the timing belt 61.

A rewinding shaft 6 that engages with the film cartridge shaft 201a
3, the spool shaft 25 is located just between the rewinding gear 62 and the spool shaft 25.
It has a friction mechanism similar to that of the spool 26. The lever 68 that comes into contact with the cartridge 201 is supported by a spring 69.
gives dextrorotation, and when it rotates left, one end 68
The configuration is such that it is possible to turn on the patrone switch SW6 with b.

A number counter 51 which is linked to the one-tooth gear 11 that rotates together with the sprocket shaft 14 is supported by a shaft 53b on a lever 53 which can be rotated about a shaft 53C. Number of sheets: 50
It rotates integrally with the roller 51. These are given levorotatory properties by springs 52. In addition, a cap 55 and a lever 57 are rotatably supported on a shaft 53c on the lever 53. lever 57 and lever 5
The spring 57b, which is hung between the levers 53 and 57, biases the lever 53 in the clockwise direction, and the bent spring 57c, together with the levers 53 and 57, biases the lever 53 in the counterclockwise direction. There is a pin 57 on the lever 57.
a is provided so that it can come into contact with the protrusion 60a of the back cover 60. The lever 45, which is rotatable around the shaft 45a, is given left rotation by a spring 45d, and the number of pins 45c is H.
Pin 4 contacts as a cam follower of 1 cam 58 and is twisted.
5b is one end 33 of the first and second winding upper limit levers 33 and 34.
b, 34b.

The sheet count side cam 58 is integral with the shaft 56a and the counter shaft 56, and is connected to the sheet counter shaft 51 via the shaft shaft 55'ff. The interlocking relationship between these is such that the number plate 50 is advanced by one frame in response to one rotation of the sprocket shaft 14, and the number plate 5o moves from S (start position mark) to 0 (mark of zero number of shots). During rotation, the pin 45c faces the small diameter portion 58a of the sheet counting cam 58.

1. When the sprocket shaft 14 rotates in the opposite direction, the number plate 5o rotates in the direction in which the number plate 5o is decremented by one frame, but the pin 58b of the number side cam 58 is brought into contact with the stopper 10 so that the number does not become less than S. ing.

Reference numerals 64 and 65 denote a pair of LEDs and light receiving elements that face each other with the film 202 as a boundary and are used to read the film information holes 204, and 66 and 67 are similar LEDs and light receiving elements that are used to read the perforations 203 of the film. It is a pair of The two pairs 64.65 and 66.67 of the LED and light receiving element for reading film information are shown in Figure 4 (
As shown in al and fbl, the complicated and dense mechanism section 80a, such as the control system and charging system of the shutter 80, is placed on the opposite side of the aperture 80b. The reason for this is that in normal cameras, the shutter mechanism 8
Opposite of 7 percha in 0a f) l! The problem is that other mechanisms are rarely placed in the fertile room of l.

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

The 35-layer film 202 is illustrated with the emulsion side as the back side. The perforations 203 are arranged in rows one above the other in the figure. The information holes 204 are a group of round holes that represent film information depending on their presence or absence. 205 is a heart-shaped positioning hole in the film. The tongue portion 205a is provided to prevent the film from coming off the protrusion 26b (FIG. 1). The section where the information hole is placed is position 1
6. Assume that the space between each perforation is used from the margin to the left of the perforation 203a, which is a distance A from the fixed hole 205, to the margin 1 to the left of the perforation 2D3b, which is a distance B from the hole 205. Assume that the lengths A and B of the information hole are limited so that the information hole is located between the loading of the film and the size of the first frame. The information given is the film's ASA/ISO sensitivity information and the number of shots taken, and the calendar in which these are binary codes is given in an arithmetic coat, and the first hole of the film information hole is the film information hole. It is assumed that the information is used as an information start signal that means that the information is scattered in a predetermined area after that.

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

The battery 100 supplies power to a known photometry circuit and an exposure control circuit via an output terminal 101, and a back cover interlocking switch SW.
3. It is applied to the power supply control circuits 102 and 113 via the cartridge switch SW6 and the power supply line VCC. The power supply control circuit 102.113 controls the power supply to the circuit threads 112.126. The power supply control circuit 102 is an S-R (set-
(Reset) The output of the flip-flop 103 is used for 1 period i1.

The outputs of the SR flip-flop 103 and the AND gate 104 are connected to the set input terminal, and the outputs of the OR gate 1o5 are connected to the reset terminal. AND gate 10'4 is winding switch SW4 and S-R flip-flop 1
The output of 28 is used as input. First reset circuit 116
is back cover interlocking switch SW3 and cartridge switch SW
When 6 is turned on, it operates and generates the first reset pulse. The SR flip-flop 128 has the output of the Macnet switch SW5 applied to its set input terminal, and the first reset pulse applied to its reset input terminal. OR Kate 10
5 inputs the output of the magnet switch SW5 and the first reset pulse. Similarly, the power supply control circuit 113 and S-
Controlled by R flip-flop 114. S-R
The flip-flop 114 has the output of the Macnet switch SW5 applied to the set input terminal 7, and the output of the OR gate 115 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.
The waveform is then shaped and output. The one-short multi-high inflator 107 outputs a tri-force pulse according to the time constants of the resistor 109 and the capacitor 110 based on the output signal of the amplifier circuit 106 . , the drive circuit 111 is configured to energize the magnet Mgl while the tri-force pulse is being generated. It's ox, McNet switch SWs are McNet Mg.
It is configured to turn off when power is applied to l.

Next, in the circuit system 126, amplifier circuits 117 and 118 detect perforation holes and information holes on the film using LEDs 65 and 61 and light receiving elements 64 and 66, shape the waveforms, and output them. A differential amplifier 119 which receives the outputs of the amplifier circuits 117 and 119 outputs only the information hole signal. The SR flip-flop 120 is set at the output of the differential amplifier 119 which detects the first information hole. and,
During this set, AND gate 121 is opened.

The output of amplifier 118 is input to AND gate 121. The output of AND gate 121 is information acquisition counter 1
22 and an AND gate 123. The information intake counter 122 counts the number of information holes on the film because the range in which they exist is predetermined by the number of perforations (the number of perforations that exist within the length B in FIG. 5). . Information intake counter 122
The first output of is applied to AND gate 123, and the second output of
The 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 until the first output is output
Gate 123 is open. Therefore, the AND gate 123 outputs a perforation detection pulse every time the amplifier circuit 118 outputs an output corresponding to the perforations present in the length B of the 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 perforation detection pulse of the AND gate 123, respectively. Then, the data register 124 sequentially designates storage addresses in the registers to which perforation detection pulses are output, and stores the presence or absence of the information hole signal from the differential amplifier 119 at the designated addresses. Second reset circuit 12
5 initializes the flip-flop 120 and 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. The case where the mode switching knob 29 is set to "positive" without switching 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, the shaft 201 of the patrona 201
When the cartridge a is inserted into the rewinding shaft 63, the cartridge 201 rotates the lever 68 to the left against the spring 69, and turns the cartridge switch 5W6iON.

Next, when the back cover 60 is closed, the protrusion 60a comes into contact with the pin 57a, resisting the spring 57c, and moves the lever 51 to the lever 53.
At the same time, the sheet counter gear 51 is rotated to the right to mesh with the one-tooth gear 11. At this time, the number plate 5o is brought to a position where the indicator 54 indicates S by the force of the spring 52.

Further, the convex portion 60b of the back cover 60 is connected to the back cover interlocking lever 38.
By pushing one end 38c, the lever 38 is rotated to the right about the shaft 38a together with the lever 37, and the sprocket shaft 1 is rotated.
4t At the same time as pushing up through the stepped portion 14d, the back cover interlocking switch SW3'i is turned on. At this time, since the armature 41c is attracted by the permanent magnet of the magnet Mg1, the levers 41, 42 are not rotated to the left by the spring 43. Therefore, magnetic switch SW
s is ON. Due to the upward movement of the sprocket shaft 14, the pin 14b is disengaged from the first sprocket gear 13, and the pin 14b is disengaged from the notch 12a of the second sprocket gear 12.
engage with. Since the plate 18 has not yet risen together, the pin 48b of the rewinding interlocking shaft 48 is connected to the notch 4 of the gear 4γ.
7a. Furthermore, the pin 23a of the idle shaft 23
releases the engagement with the gear 21, and the notch 20a of the cylinder 20
engage with. At the same time, the tapered portion 23b disables the engagement between the first volume upper limit lever 33 and the first volume upper limit plate 16, and the reverse tapered portion 2-3C causes the second volume upper limit lever 34 to disable engagement with the first volume upper limit lever 33 and the first volume upper limit plate 16.
The second winding upper limit plate 17 and the claw portion 34a can be engaged with each other. However, at this point, the pin 45c of the lever 45 falls into the small diameter portion 58a of the counting cam 58,
When the lever 45 turns left, the pin 45b prevents the first and second hoisting limit levers 33, 34 from turning left, and the large diameter portion 31a of the second cam 31 also prevents the left turning. The notch 17a of the second winding limit plate 17 and the claw 34a do not engage with each other. On the other hand, by turning on the cartridge switch SW6 and the back cover interlocking switch sw3, the battery 100 is connected to the power supply control circuits 102 and 113, and at the same time, the first reset circuit 116 generates a first reset pulse. Therefore, the flip-flops 103.114 are connected to the OR gates 105.
115. Therefore, the power supply control circuits 102 and 113 do not operate. 'Furthermore, since the magnet switch SW5 is ON, the flip-flop 128 is also reset by the first reset pulse, and the AND gate 104 is opened.

When the hoisting lever 1 is turned left in this state, the hoisting switch SW4 is turned on, and while this state is maintained, the gear 12 is turned right through gears 6 to 9, and at the same time, the gear 12 is turned to the right through gears 6 and 10. Rotate 13 to the left. As aforementioned,
At this time, the pin 14b of the sprocket shaft 14 is connected to the gear 12.
, the sprocket shaft rotates to the right, and gear 47 also rotates to the right via gear 15a and gear 49. As mentioned above, since the pin 48b of the rewinding interlocking shaft 48 is engaged with the notch 47a of the gear 47, the pulley 46
, a timing belt 61, and a rewinding pulley 62.
Since it rotates to the right, the film 202 is fed in the rewinding direction.

Further, 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 rotates idly;
Since a is engaged with the cylinder 20, the spool gear 24 is locked. In this way, the film 202 resists the friction between the spool shaft 25 and the spool 26.
is fed in the unwinding direction (to the left in FIG. 1).

At the same time, the single-tooth gear 11 also rotates to the right. However, the sheet count gear 51 that meshes with this is the pin 5 of the sheet count cam 58 that interlocks with the sheet count gear 51.
8b is in contact with the stopper 70, ■Tooth gear 1
The rotational force 1 rotates the lever 53 to the left, acts to release the number counter gear 51, and maintains the position of the number plate 50S.

Now, when the hoisting switch SW4 is turned on as described above by operating the hoisting lever 1, the magnet Mgl attracts the armature 41c with a permanent magnet and the shimagnet switch SW5 is turned on.
The shift flip-flop 103 is set by the output of the gate 104. The power supply control circuit 102 starts supplying power to the circuit system 112 based on the output of the flip-flop 103.

When power is supplied to the circuit system 112, the LEI) 27 emits light, but at this time, the film wound around the spool 26 does not move until the convex portion 26b where the positioning hole 205 is attached faces the light receiving element 28 when loading the film. is the other hole 2
Since the 6C is blocked, the light does not reach the light receiving element.

When the film 202 is further fed in the rewinding direction and the convex portion 26b fitted with the positioning hole 205 faces the light receiving element 28, the light receiving element 28 detects the light emission from the L E D 27, and the amplifier circuit 106 detects the light emitted from the light receiving element 27. The output is transmitted to monostable multivibrator 107. Monostable multivibrator 107 generates a tri-force pulse corresponding to the time constant of resistor '109 and capacitor 110. While this tri-force pulse is being generated, the drive circuit 111 energizes the magnet Mgl. This energization causes the armature 4 to
1c 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 430. As a result, the pin 41b resists the spring 39 and rotates the lever 37 to the right around the shaft 38b, so that the engagement with the stepped portion 14d of the sprocket shaft 14 is released. Therefore, the sprocket shaft 14 is lowered by the horn of the leaf spring 19, and at this time, the reverse taper portion 14e rotates the lever 41, 42 to the right until the armature 41c is attracted to the magnet Mgl, and the pin 14b is connected to the second sprocket gear 12. is disengaged and engaged with the first sprocket gear 13. Rewinding interlocking shaft 48, idle shaft 23
20a of the cylinder 20, and the pin 48b is disengaged from the notch 47a of the carrier 47, and the pin 23a is disengaged from the notch 20a of the cylinder 20, and the pin 23a is disengaged from the notch 20a of the cylinder 20, so that the pin 48b is disengaged from the notch 47a of the carrier 47, and the pin 23a is disengaged from the notch 20a of the cylinder 20.
engage with a.

During a series of operations starting from the detection of light emission by the LED 28, the Macnet switch SW5 is temporarily turned OFF by turning the lever 41 to the left, and this signal resets the flip-flop 103 via the OR gate 105. Therefore, the power supply control circuit 102 stops supplying power to the circuit system 112. Further, since the flip-flop 128 is set by turning off the magnet switch SW5, the AND gate 104 is closed. Therefore, the flip-flop 103 will not be set again even if the hoisting switch 3W4 is turned on or off next time when the hoisting lever 1 is turned to the left. Subsequent operation of the magnetic switch SWs becomes irrelevant. Furthermore, the flip-flop 114 is set as the magnet switch SWs is turned off. Therefore, the power supply control circuit starts supplying power from the battery 100 to the circuit system 126. Then, the LED 65.6γ starts emitting light.

At this point, the sprocket shaft 14 has descended as described above, and the operation of the winding lever 1 has been switched to rotate the sprocket 15 and spool 16 to the left.
The film is fed in the direction in which the film 202 is pulled out from the cartridge 201, that is, in the l1llll'i direction. When the perforation 203 passes between the detection sections (photocuffs) 64.65 and 66.67, the amplifier circuits 117 and 118 output signals for each perforation. Since there is no film information hole 204 in the length A region of the film, both amplifier circuits 117 and 118 output a pulse signal for each perforation. 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. AN by the output of flip-flop 120
D gate 121 is closed, AND gate 121
The output of does not change. Still, the information acquisition counter 122
The output of is lysed.

The counter 1 is reset by the reset circuit 125.
Although the AND gate 123 is open due to the output of 22,
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 does not perform a storage operation.

When the first hole of the film information 204 passes through the detection section,
A differential amplifier 119 outputs a signal of only the information hole. Therefore, flip-flop 120 is set and AND gate 121 is opened. After that, one pulse is output each time each perforation passes through the detection part.
21 and is counted by an information intake counter 122.

Well, the output state of the information acquisition counter 122 does not change until it reaches a predetermined divisor value, so the AND
The gate 123 is open, and the pulse for each perforation is input to the data register 124, and the memory address in the 111th data register 124 is shifted to store the presence or absence of a film information hole in each perforation pulse guard, that is, film information. To go.

When the above-described information acquisition operation progresses and reaches the final number of perforations in which a predetermined film information hole 204 exists, the output of the information acquisition counter 122 is inverted. Therefore, AND gate 123 is closed and data register 12
4 stores film information, and at the same time, the information is transferred to the storage circuit 127.

As described later, the circuit system 1 including the data register 124
Since the power supply to 26 is cut off after the information acquisition is completed, a 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 supplying power to the circuit system 126.

In this case, the power supply to the circuit 126 only needs to be 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 does not need to be limited to a delay of one perforation. Without,
There may be more. Since the switches 3W1 and SW2 are OFF when reading the film information, there is no possibility that the detection system will malfunction due to an erroneous photographing operation.

During the above information hole reading operation, pin 4 of lever 45
5C is depressed into the recess 58a of the counting cam 58.

During this time, the cam 58 rotates to the right in response to the winding of the film, and the number plate 50 rotates to the left so that the letter opposite to the index 54 changes from S to O. When the reading of the film information is completed and the film is further fed in the forward direction to a frame that can be photographed, the pin 45c of the lever 45 rides on the large diameter part of the sheet counting cam 58. Let's go. Therefore, the lever 45 turns right and the pin 45b cannot escape, and the first hoisting limit lever 33 waits for the first hoisting limit plate 160 rotations and then engages with its notch 16a, stopping the rotation of the sprocket shaft 14 and Turn on switch 5Wli. Second
As shown in the figure, by turning on this switch SW5, the release switch SW7' ((by turning on, it becomes possible to energize the release magnet Mg2), which is linked to the press of the release button for the first time. At this point, it becomes possible to start the photographing operation of the camera.

A predetermined photographing operation is performed, and a signal f related to its completion is generated.
/! For example, in response to a running signal from the shutter trailing curtain, the first winding limit lever 33 is rotated to the right by a known means (not shown), and the engagement with the first winding limit plate 16 is released. Therefore, film feeding becomes possible again, and the sprocket shaft 14
One rotation causes the first volume limiter 16 and the first volume limiter lever 3 to rotate.
3 is engaged, the next photographing operation is possible.Next, the rewinding operation when the mode switching knob 29 is set to "stop" 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 link shaft 48 and the idle shaft 23, and the lever 37 is attached to the stepped portion 14d.
is engaged. Therefore, as described above, the pin 14b of the spool shaft 14 engages with the carrier 12, the pin 48b of the rewinding interlocking shaft 48 engages with the carrier 47, and the pin 23a of the idle shaft 23 engages with the cylinder 20. do. The tapered portion 23b of the idle shaft 23 rotates the first hoisting limit lever 33 to the right,
The engagement with the first volume upper limit plate 16 is released.

In this state, when the winding lever 1 is turned to the left, the spool 1li
The li114 rotates to the right, and in conjunction with this, the rewinding pulley 6
Since the film 202 also rotates to the right, the film 202 is fed in the rewinding direction. During this rewinding operation, switch swl, sw2
Since this is in the OFF state, there is no possibility that a photographing operation will be performed by mistake, as in the case of reading film information.In this way, by further operating the winding lever 1, a rewinding operation is performed.

Next, the case where the mode switching knob 29 indicates "reverse" will be described in section (b), but the explanation will be omitted for cases where the 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 31a escapes from the second winding upper limit lever 34. When a film is loaded and the back cover 60 is closed, the sprocket shaft 14, the rewind interlocking shaft 48, and the idle shaft 23 are displaced upward as described above, and their interlocking relationship with the winding lever 1 changes. ' = 1, from the second winding upper limit lever 34 to the idle shaft 2
The reverse tapered portion 23c of No. 3 escapes, but the lever 45
prevents it from rotating to the left, so it is not engaged with the second winding upper limiter plate 17.

Following 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 emission from the L HD 27, the sprocket shaft 14 is again displaced downward and the film feeding direction becomes the forward direction. Only the film information holes are 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 SWl and SW2 are OFF.
Since it is F, no photographing operation is performed.

In this way, after the film is fed to the predetermined position 1, when the R button 14f is pressed by an external operation, the sprocket shaft 14, the rewinding link shaft 48, and the idle shaft 23 are displaced upward and locked. be done. 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.
Shooting operation becomes possible. The camera enters 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, even if the method is applied to a camera that has only one of the methods, the effect will be fully demonstrated.

As described above, according to the present invention, when using a film with information holes, even if the user winds up part of the leader too much on the spool when loading the film, and the film information hole goes too far past the detection part, Since the film is first rewound by the inevitable winding operation as a preparatory operation for photographing, and then the film information is read, it becomes impossible for the user to provide a camera that does not malfunction.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of the present invention, Fig. 2 is a circuit diagram showing the configuration of the release magnet and related switches, Fig. 3 is a sectional view of the spool, and Fig. 4 is a film information detection section and shutter. FIG. 5 is a diagram showing an example of the 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 = 12 a, 13a, 14b, 14d, 20
a=21a, 23a, 37. 47a, 48b Reading means...64.65.66.67, +2 figure a figure

Claims (1)

[Claims] In a camera using a film provided with photographic information and having a first mode in which the film can be wound in a direction in which the film is pulled out from the cartridge and a second mode in which the film can be rewound in a direction in which the film is pulled back into the cartridge, the second mode is provided. Detection means for detecting that the film has been rewound in the film loading position trench in the mode: Prior to shooting, the film is rewound in the second mode, and the detection means moves the film from the second mode to the second mode by the operation of the detection means. 1 mode; and a reading means for reading the shooting information when in the first mode.