JPH09230457A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a film winding motor from being stopped in the middle of film winding in the case of next film winding by stopping an intermittent sprocket which is driven following the film feeding, at a predetermined initial position in the case of the film rewinding in a camera using a film provided with a perforation column alternately having a long interval regulating the length of each frame in a film feeding direction and a short interval regulating a mutual interval between frames. SOLUTION: This camera is provided with a locking mechanism detecting that a counter board 49 is returned to a start position in the case of the film rewinding, and locking the intermittent sprocket 27 to a predetermined position. The locking mechanism is provided with a rotating member 24 for locking which is linked with the sprocket 27, and a lock lever 55 provided with a hook- shaped pawl 55b engaged with the hook-shaped engaging part 54a formed on the member 54.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a perforation row in which a long interval defining the length of each frame in the film feeding direction and a short interval defining the interval between frames are alternately provided. More specifically, the present invention relates to a camera that uses a film, and is configured to take a film while winding the film from a film cartridge loaded in a cartridge chamber of the camera with a motor, and rewind the film into the main body of the cartridge after the filming is finished. It's about the camera.

[0002]

2. Description of the Related Art For example, as disclosed in JP-A-5-19368, a photographic film provided with two perforations per frame has been proposed. These two
The individual perforations are provided at the position corresponding to the top of the frame and the position corresponding to the rear end of the frame for each frame, and it is premised that each frame is photographed between these perforations. Therefore, in the perforation, a long interval that defines the length of each frame in the film feeding direction and a short interval that defines the interval between the frames are alternately given, and the long interval and the short interval are added. The length is one frame feed length.

As a suitable means for carrying a film having such a format with a relatively inexpensive structure, a pair of teeth engaging with the perforation are provided on the outer periphery so as to match the short intervals of the perforation. A film feeding mechanism using an intermittent sprocket that is rotated by the feeding of the above has been proposed.

This film feeding mechanism is equipped with a film winding mechanism for transferring a film one frame at a time by a motor each time the shutter button is pressed down (shutter release operation). The intermittent sprocket is intermittently rotated once.

Further, a film winding stopping mechanism which operates at the time when one frame of film has been wound up and a switch interlocking with this film winding stop mechanism are provided, and when the winding of one film of film is completed, the film winding operation is completed. The stop mechanism operates to turn off the switch to stop the normal rotation drive of the motor. This film winding stop mechanism includes a rotating member that has a groove at a predetermined angular position and that rotates in conjunction with the intermittent sprocket, and a locking lever that has an engaging end that can be engaged in the groove of the rotating member. The intermittent sprocket is locked for each frame by engaging the engaging end portion with the groove so that the film is not wound. Then, the rotation of the intermittent sprocket accompanying the film winding is utilized to perform the shutter charge against the biasing force of the spring.

Since such a film winding stop mechanism and shutter charge mechanism mechanically detect the movement of the perforation, the film transfer for one frame can be surely detected and the shutter charge can be performed. By performing it while the teeth of the intermittent sprocket are engaged with the perforations, it is possible to resist the biasing force of the spring applied to the shutter.

Further, in the above film feeding device,
When the photographer operates the film rewinding operation member after shooting the last frame, the frames are stopped in sequence and the film rewinding mechanism and shutter charge mechanism are disconnected from the intermittent sprocket. As a result, the intermittent sprocket becomes free, and the motor rotation direction changeover switch interlocking with the film rewinding operation member is changed over to the reverse rotation side. By this operation, the motor is rotated in the reverse direction to rewind the film. At this time, since the intermittent sprocket is free, it is possible to rewind all the photographed film into the cartridge main body.

[0008]

By the way, during the rewinding of the film, the intermittent sprocket is intermittently rotated by following the film rewinding direction. Therefore, after rewinding the film that has already been shot, the intermittent sprocket stops at the position where the film leading edge is detached,
At this stop position, variation occurs due to the film transfer force.

However, if the stop position of the intermittent sprocket after the film rewind is not constant, the following inconvenience occurs.

First, when the teeth of the intermittent sprocket protrude into the film feeding path, when a new film cartridge is loaded into the camera and the leading end of the film is fed out from the inside of the cartridge main body, the film leading end. May be caught on the teeth of the intermittent sprocket and the film may not be wound up.

Secondly, even if the film can be wound up, if the stop position of the intermittent sprocket is deviated from the regular stop position, the film winding stopping mechanism operates during the film winding and the motor stops. The situation occurs.

Thirdly, there is a problem that may occur when the camera has a function of stopping the forward rotation of the motor after a predetermined timer time has elapsed after the shutter release when the film cannot be fed.

When a film as described above is used, the intermittent sprocket is not rotated because there is no perforation when the film is wound up after the last frame of the film has been photographed. Does not work. In that case, since the switch for stopping the motor in conjunction with the operation of the film winding mechanism is not operated, the normal rotation of the motor is continued. Therefore, an electric timer using the discharge time of the capacitor is provided so that the motor automatically stops when a predetermined time has elapsed after the shutter release even when the film winding mechanism does not operate. And this timer time is 15
It is set to about seconds.

However, after the filming of the last frame of the film is completed, the photographer immediately operates the film rewinding operation member to switch the motor rotation direction changeover switch to the reverse rotation side and reverse the motor to rotate the film. Assuming that the film rewinding operation member is returned to the original position after rewinding in the cartridge body and rewinding is completed, the rewinding time is extremely short in the case of a short film such as 15 shots. At the time when the film rewinding operation member is returned to the original when the return is completed, the timer time may not have elapsed.

In this case, the motor rotation direction changeover switch is switched to the forward rotation side, but if the intermittent sprocket is stopped at the regular stop position, the film rewinding operation member is returned to its original position. Since the film winding stop mechanism operates and the switch for stopping the motor is operated, there is no possibility that the motor rotates in the normal direction even if the timer time has not elapsed.

However, when the stop position of the intermittent sprocket is out of the normal stop position where the film winding mechanism operates, if the timer time remains, the motor rotates in the normal direction and is rewound. This causes the inconvenience that the existing film is sent out again from the inside of the cartridge body.

In view of the above-mentioned circumstances, the present invention provides a perforation array in which a long interval defining the length of each frame in the film feeding direction and a short interval defining the interval between the frames are alternately provided. An object of the present invention is to provide a camera using a provided film, which solves the problem caused by the positional deviation of the stop position of the intermittent sprocket that stops after rewinding the film.

[0018]

The camera according to the present invention comprises:
The outer peripheral surface is provided with teeth that engage with the perforations of the film, the outer peripheral surface frictionally engages the film to be fed, and the friction rotation region in which the perforations are driven to rotate, and the teeth that engage with the perforations and are driven to rotate. With an intermittent sprocket having a combined rotation range, and when the film is wound, the intermittent sprocket is driven while the film is being fed by one frame,
When the film is rewound, the counter plate is rotated one step at a time from the start position, and when the film is rewound, the counter plate returns to the start position as the film is rewound in the direction opposite to the film winding of the intermittent sprocket. A lock mechanism for detecting that the counter plate has returned to the start position and locking the intermittent sprocket at a predetermined position is provided (claim 1).

The lock mechanism includes a locking rotary member having a locking portion at a predetermined angular position on the outer peripheral surface and rotating in conjunction with the intermittent sprocket, and a pawl capable of engaging with the locking portion of the rotary member. Then, the pawl is rotatably provided between a lock position where the pawl is locked to the locking portion to lock the rotary member and a retracted position where the pawl cannot engage with the locking portion. Through the lock lever that locks the intermittent sprocket at a predetermined position, and when the counter plate is at a position other than the start position, locks the lock lever at the retracted position, and when the counter plate returns to the start position, lock the lock lever. And a cam member which is opened to allow the rotation of the lock lever to the lock position (claim 2).

In this case, it is preferable that the claw of the lock lever has a hook shape, and that the locking portion of the rotating member is formed into a hook shape that can engage with the claw of the lock lever and engage freely. 3).

The cam member may be provided on the counter plate (claim 4).

Further, the lock lever is integrally provided with an elastic arm, and the counter plate is provided with a lock lever urging projection capable of engaging with the elastic arm when the counter plate is returned to the start position. The biasing protrusion may be configured to engage the elastic arm and elastically deform the elastic arm so that the biasing force toward the lock position is applied to the lock lever (claim 5).

[0023]

According to the first aspect of the present invention, a lock mechanism is provided for locking the intermittent sprocket at a predetermined position by detecting that the counter plate has returned to the start position when the film is rewound. When loading a film cartridge into a camera and trying to feed the leading edge of the film out of the cartridge body, there is no risk that the leading edge of the film will be caught by the teeth of the intermittent sprocket and the film cannot be wound up. There is no possibility that the motor stops due to the film winding mechanism operating during the winding process.

Further, if the position where the intermittent sprocket stops when the counter plate returns to the start position by film rewinding is defined, a mechanism for surely stopping the motor at this position is interlocked with the intermittent sprocket. It can be easily provided. Therefore, after the filming of the last frame of the film is completed, the photographer immediately operates the film rewinding operation member to set the motor rotation direction changeover switch to the reverse rotation side and reverses the motor to load the film in the cartridge main body. Rewinding, and when the film rewinding operation member is returned to the original when the rewinding is completed, even if the timer time has not elapsed, the motor rotates in the forward direction and the rewound film is rewound. There is also no risk of inconvenience of being delivered again from within the body.

According to the invention of claim 2, the lock lever is locked in the retracted position when the counter plate is at a position other than the start position, and the lock lever is released when the counter plate returns to the start position. By providing the cam member that allows the lock lever to rotate to the lock position, the intermittent sprocket can be reliably locked at the predetermined position when the counter plate returns to the start position.

According to the third aspect of the present invention, the claw of the lock lever is formed into a hook shape, and the engaging portion of the rotating member that interlocks with the intermittent sprocket can be engaged with the claw to engage with the hook. In the case of the shape, the engagement between the claw and the locking portion becomes stronger, and the intermittent sprocket can be locked more reliably by locking the rotating member by the lock lever.

Since the cam member is provided on the counter plate as in the fourth aspect of the present invention, it is not necessary to separately provide a mechanism for detecting the return of the counter plate to the start position, which is low cost. Can be realized.

Further, as in the invention of claim 5, the lock lever is integrally provided with an elastic arm, and by elastically deforming the elastic arm, a biasing force toward the lock position is applied to the lock lever. In this case, it is not necessary to separately provide a biasing means for the lock lever, and the number of parts can be reduced accordingly.

[0029]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of the film cartridge showing the film used in the camera of the present invention in a state where the film is pulled out from the cartridge body.

The film cartridge 10 is provided with a spool 13 in which a film 12 is wound in a cartridge body 11, and by rotating the spool 13 in a film feeding direction by a motor,
The film 12 is configured to be delivered to the outside from the tip 12a side thereof.

On the film 12, frame positioning perforation lines 14a to 14z are formed at one edge along the length direction thereof along the film feeding direction. These perforation lines 14a to 14z are
Two pieces are formed for each frame at a position corresponding to the beginning and a position corresponding to the rear end of each frame. Between each of these two perforations, for example, between the perforations 14b and 14c, each frame, For example, it is assumed that the frame 15a is photographed.

For this reason, the perforation lines 14a ...
14z alternately has two types of intervals, a short interval L1 for determining the interval between the frames 15a to 15m and a long interval L2 for determining the length of each of the frames 15a to 15m in the film feeding direction. They are arranged, and are arranged in the order of a short distance L1 and a long distance L2 from the film front end 12a side.

On the camera side, the film 12 is fed so that the center in the longitudinal direction of the aperture is aligned with the center between the perforations with the long distance L2, and the photographed frames 15a to 15m corresponding to the size of the aperture are formed. . The one-frame feed length is L1 + L2.

On the film rear end 12b side of the last frame 15m, a perforation 16 for film end detection is formed on the edge opposite to the edge on which the perforation rows 14a to 14z are formed. The distance between the last perforation 14z and the perforation 16 for detecting the film end in the film feeding direction is set to be shorter than the short distance L1.

FIG. 2 shows the film winding of this camera.
FIG. 2 is a perspective view schematically showing a rewinding mechanism, showing an aperture 17;
There is a cartridge chamber on the left side and a film winding chamber on the right side. The aperture 17 is
It has a curved shape with a concave surface facing the taking lens 18 side together with a film passage that passes behind.

The film cartridge 10 is loaded in the cartridge chamber along the axial direction of the spool 13. A shaft hole 19 having a key groove is formed at one end of the spool shaft and is exposed to the outside from the end surface of the cartridge body 11. The shaft hole 19 has a drive shaft 20 provided in the cartridge chamber.
Are engaged and the spool 13 is rotated by the rotation of the drive shaft 20 by the motor.

A light-shielding door is built into the cartridge body 11 inside the film entrance 21. The light shielding door is rotatably provided between a closed position that closes the film entrance 21 and an open position that opens the film entrance 21. A key groove 22 exposed from the end surface of the cartridge body 11 is formed at one end of the light shielding door.
The drive shaft 23 for opening and closing the light-shielding door provided in the cartridge chamber is engaged with 2. The drive shaft 23 is interlocked with the operation of the key member that locks the lid member of the cartridge chamber to the closed position. When the key member is operated to the position that locks the lid member, the door member is opened and the key member is opened. Is rotated to the position where the door member is closed when it is operated to the unlock position.

The drive shafts 20 and 23 are provided so as to project in the back of the cartridge chamber, and when the lid member of the cartridge chamber is opened and the film cartridge 10 is loaded from the axial direction of the spool 13, the key groove of the spool 13 is formed. The drive shaft 20 for driving the spool is provided in the shaft hole 19 provided with
The drive shafts 23 for opening and closing the door member 2 are smoothly engaged with each other.

After the light-blocking door is rotated to the open position in association with the locking operation of the lid member of the cartridge chamber by the key member, the driving of the film feeding motor 24 in the forward direction is started. The drive of the motor 24 is decelerated by a gear train or the like and transmitted to the drive shaft 20, and the spool 13 is rotated in the film feeding direction. Then, the film 12 sent out from the inside of the cartridge body 11 is sent to the film winding chamber through the back of the aperture 17 along the film passage.

A winding shaft 25 is rotatably arranged in the film winding chamber. The drive of the motor 24 is transmitted to the winding shaft 25 after being decelerated by a gear train or the like.
The delivered film 12 is wound up from the tip 12a. A slip mechanism is incorporated between the motor 24 and the winding shaft 25. This slip mechanism absorbs the difference between the rotation of the winding shaft 25 and the rotation of the motor 24, which are thickened as the film 12 is wound.

After the shooting of the last frame 15m is completed, the motor 24 is reversely driven by the operation of the film rewinding operation member 52 (described later), and the film rewinding operation is performed. At this time, the reverse rotation drive is not transmitted to the winding shaft 25 by the clutch 26 incorporated between the film 12 and the winding shaft 25. Therefore, the film 12 is rotated by the spool 13 in the film winding direction. Housed inside.

Aperture 17 as seen from the side of the taking lens 18
An intermittent sprocket 27 is rotatably incorporated in the upper part of the drawing and at a position closer to the film winding chamber side than the photographing optical axis 18a. The intermittent sprocket 27 is provided with two teeth 27a and 27b that sequentially mesh when the pair of perforations 14 lined up at a short interval L1 move, and the rotation locus of the outer peripheral surface of these teeth 27a and 27b is in the film path. To intervene.

Below the intermittent sprocket 27, a film end detecting claw 50 which engages with the end detecting perforation 16 of the film 12 is provided. The film end detection claw 50 is rotatable between an engaging position for engaging the perforation 16 and a retracting position for retracting from the engaging position, and is biased toward the engaging position by a spring 51. The film end detection claw 50 is engaged with the perforation 16 to prevent further film winding. As is apparent from FIG. 1, the perforation 16 at the film front end 12a is
A taper surface 12c is formed on the extension line of the above, so that the film end detecting claw 50 is prevented from being caught on the film 12.

FIG. 3 is a sectional view showing the intermittent sprocket 27 taken along a plane perpendicular to its axis, and FIGS. 4 and 5 are sectional views taken along lines IV-IV and VV in FIG. 3, respectively. Is. The intermittent sprocket 27 provided with a pair of teeth 27a and 27b on the outer peripheral surface according to the short interval L1 of the perforation rows 14a to 14z has
A pair of teeth 27a, 27b and these teeth 27a, 27b
A rubber member 28 for improving the frictional resistance with the film 12 is exposed and provided on the outer peripheral surface of the length L3 excluding the intervening surface. The length L3 is the perforation row 14
It is set to a long interval L2 of a to 14z or less. That is, the engagement rotation range in which the pair of teeth 27a and 27b are engaged with the perforations 14 arranged at the short intervals L1 and driven to rotate is the circumferential length L1 shown in FIG. The frictional rotation region in which the member 28 frictionally engages and is driven to rotate is the circumferential length L3.

The intermittent sprocket 27 rotates following the feeding of the film 12, but the film 12 is fed by one frame when the film is wound, and the film winding stop mechanism (described later) is activated to stop the film feeding. At that point, the rotation is stopped. At this time, the preceding tooth 27a along the rotation direction is disengaged from the perforation 14, and the following tooth 2a
7b is in the state of the top stop position in which the perforation 14 is engaged.

The rubber member 28 causes the intermittent sprocket 27 to be driven to rotate by the friction generated between the film 12 and the pair of teeth 27a and 27b out of the perforation 14 while the film 12 is being fed one frame. ,
After the preceding tooth 27a comes into contact with the film 12 and the driven rotation of the intermittent sprocket 27 is prohibited, the film 12 is transferred while slipping until the preceding tooth 27a engages with the next corresponding perforation 14. Is configured to allow.

FIG. 6 is an exploded perspective view schematically showing the film feeding device of this camera.

The rotation of the intermittent sprocket 27 is performed by a shutter charge mechanism through a gear 30 provided coaxially with the intermittent sprocket 27 and a gear 31 meshing with the gear 30.
It is transmitted to a film winding mechanism, a counter mechanism, a lock mechanism, and the like. The shutter charge mechanism and the film winding mechanism include a shutter charge cam 33, a disc-shaped rotation member 34 for locking the winding, a locking lever 35, a shutter drive lever 36, a torsion spring 37, and the like.

The shutter charge cam 33 and the rotation stopping rotation member 34 are fixed to the cam shaft 32 together with the gear 31, and are interlocked with the rotation of the intermittent sprocket 27.
The unwinding rotary member 34 has a groove 34 at a predetermined position on the outer peripheral surface.
a.

The locking lever 35 is rotatably provided around a shaft 38. The locking lever 35 has a structure shown in FIG.
Also, as shown in FIG. 11, the engaging end portion 35a, the pressure receiving portion 35b, the falling piece 35c, and the falling protrusion 35.
d, the switch pressing piece 35e, and the like are integrally formed. The groove 34a of the winding stopping rotation member 34 is located at the top stop position of the intermittent sprocket 27 within the rotation locus of the engaging end portion 35a. After the shutter charge is completed, the locking lever 35 is pivoted to the winding stop position where the engaging end portion 35a is engaged in the groove 34a to prevent the rotation of the rotating member 34 (see FIG. 10), and The rotation member 34 is prevented from rotating counterclockwise in FIG. 6 to prevent the intermittent sprocket 27 from rotating clockwise. Further, the locking lever 35 rotates to the winding stop release position where the engagement end portion 35a retracts from the groove 34a and unlocks the intermittent sprocket 27 after the shutter release is completed (see FIG. 11).

One end 37a of the torsion spring 37 is locked to the falling piece 35c of the locking lever 35, and the other end is locked to the spring receiving portion 36d of the shutter drive lever 36, thereby locking the locking lever 35. Is urged about axis 38 towards the unwind position (clockwise in the figure). The switch pressing piece 35e of the locking lever 35 turns on the switch 46 when the locking lever 35 is rotated to the unwinding release position.

Falling projection 35d of locking lever 35
Holds the shutter drive lever 36 in the charge position by intervening in the rotation locus of the rising protrusion 36c and engaging with the protrusion 36c when the shutter drive lever 36 rotates to the charge position (see FIG. 10). . The falling piece 35c of the locking lever 35 is pushed toward the unwinding release position by a rod 39a provided below the shutter button 39 that is pushed down by the shutter release. Further, when the locking lever 35 moves to the unwinding release position, the falling protrusion 35d of the locking lever 35 moves to the shutter drive lever 3
Withdraw from the rotation locus of the rising protrusion 36c of 6
The holding of the shutter drive lever 36 at the charge position is released.

The shutter button 39 is, for example, an elastic button formed by cutting out a part of the upper surface of the camera body, and a switch 40 which is pressed by the shutter button 39 to turn on is disposed below the button. There is.

The engagement end portion 36a of the shutter drive lever 36 faces the rotation locus of the shutter charge cam 33 (see FIG. 11). In addition to the engaging end portion 36a, a kicking piece 36b, a rising projection 36c, a spring receiving portion 36d for locking the other end of the torsion spring 37, and a pressure receiving portion 36e are integrally formed with the shutter drive lever 36. It is formed so as to be rotatable around the shaft 41 in a manner urged toward the release completion position (counterclockwise in the drawing) by the torsion spring 37. The shutter drive lever 36 has a charging position in which the engagement end portion 36a is pushed by the shutter charge cam 33 to be charged (FIG. 10).
And the release completion position (FIG. 11) rotated counterclockwise from this position by the urging force of the torsion spring 37.

Kick-off piece 36 of shutter drive lever 36
In b, the shutter blade 42 is kicked while the shutter drive lever 36 is rotated from the charging position to the release completion position by the urging force of the torsion spring 37. As a result, the shutter blades 42 resist the urging force of the pull-back spring 45 and the shaft 43.
6 rotates in the clockwise direction in FIG. 6 to expose the shutter opening 44. After that, it is instantly returned to the original position by the pull-back spring 45.

The rising projection 36c of the shutter drive lever 36 is a falling projection 35d of the locking lever 35 when the shutter drive lever 36 is rotated to the release completion position.
The locking lever 35 is held in the unwinding release position by intervening in the rotation locus of (FIG. 11).

During the rotation of the intermittent sprocket 27 by feeding one film of film, the shutter charge cam 3
3 rotates the shutter drive lever 36 against the biasing force of the torsion spring 37 toward the charge position from the release completion position. Therefore, the shape of the shutter charge cam 33 is taken into consideration so that the shutter charge is performed by the rotational force of the intermittent sprocket 27 while the pair of teeth 27a and 27b and the perforations 14 are engaged. Due to this, when the intermittent sprocket 27 is moved to the frame stop position by the transfer of one frame of film, the shutter charge cam 33 passes over the rotation locus of the engaging end portion 36a of the shutter drive lever 36, as shown in FIG. The shutter drive lever 36 can be rotated to the release completion position by the subsequent shutter release.

The counter mechanism is composed of a one-tooth gear 48 fixed to the upper end of the cam shaft 32, and a counter plate 49 having on its outer periphery a tooth portion 49a with which the one-tooth gear 48 meshes. The one-tooth gear 48 advances the counter plate 49 by one graduation by one rotation of the intermittent sprocket 27. The counter plate 49 is rotatably arranged on the shaft 41 on which the shutter drive lever 36 is provided, and the scale is displayed on the upper surface. Each time the scale is advanced, the number of frames to be photographed is displayed in a progressive manner through a display window 58 provided on the outer surface of the camera body.

In the motor 24, the switch 46 is turned ON when the locking lever 35 is rotated to the unwinding release position, and the switch 40 is turned OFF after the pressing operation of the shutter button 39 is completed, so that the film 12 is turned on. It is driven in the normal direction so as to transfer in the film winding direction. Then, by moving the film 12 one frame, the locking lever 35
Since the switch 46 is turned off by rotating to the winding stop position, the motor 24 is stopped.

The film rewinding operation after the completion of photographing is performed by the film rewinding operation member 5 exposed on the outer surface of the camera body.
It is started when the photographer slides 2 from the normal position to the rewind position. This rewind operation member 52
The two pressing portions 52a and 52b and the switch pressing piece 52c are integrally formed with each other. Pressing parts 52a, 52
When the rewinding operation member 52 moves to the rewinding position, b presses the pressure receiving portion 35b of the locking lever 35 and the pressure receiving portion 36e of the shutter drive lever 36, respectively, and winds the locking lever 35. This state is maintained by forcibly rotating the shutter release lever 36 and the shutter drive lever 36 to the charge position, respectively. As a result, the drive transmission from the intermittent sprocket 27 to the film winding mechanism and the shutter charging mechanism is cut off, and the intermittent sprocket 27 becomes free to rotate.

When the rewinding operation member 52 moves to the rewinding position, the switch pressing piece 52c switches the motor forward / reverse rotation changeover switch 53 to the reverse rotation side to drive the motor 24 in the reverse rotation. By this film rewinding, the intermittent sprocket 27 is reversely rotated while engaging with the perforation 14, and the one-tooth gear 48 reverses the counter plate 49 toward the start position.

When the film rewinding is completed, the film front end 12a comes out of the intermittent sprocket 27, and the intermittent sprocket 27 stops. Although there are variations in the stop position, the intermittent sprocket 27 is stopped in one section of the intermittent sprocket 27 during which shutter charging is performed. In this case, if the stop position of the intermittent sprocket 27 deviates from the specified stop position, as described above, there are problems such that the specified number of images cannot be taken and the next film cannot be fed.

Therefore, a locking mechanism is provided for locking the intermittent sprocket 27 at the initial position while the film front end 12a is being ejected from the intermittent sprocket 27. This lock mechanism is integrally formed on the back surface of the counter plate 49, and a disc-shaped rotating member for locking 54 fixed to the cam shaft 32, a lock lever 55 rotatably provided on the shaft 38. The lock lever urging projection 56 and the C-ring-shaped lock lever actuating cam 57 are included.

The locking rotary member 54 is fixedly mounted on the cam shaft 32 at a position between the one-tooth gear 48 and the winding stop cam 34, and the hook-shaped engaging portion 5 is provided at a predetermined position on the outer peripheral surface 54b thereof.
4a are provided in a row.

As is apparent from FIG. 9, the lock lever 55 has an annular portion 55a rotatably supported by a shaft 38 provided with the locking lever 35, and the annular portion 55.
It is composed of a locking arm 55b and an elastic arm 55c which project in the radial direction at a predetermined angle from each other. A hook-shaped claw 55d is formed at the tip of the locking arm 55b, and the lock lever 55 has a locking position (FIG. 9) at which the claw 55d engages with the hook-shaped locking portion 54a of the rotating member 54. The claw 55d is provided on the shaft 38 so as to be rotatable between the claw 55d and the retracted position (FIG. 14) that has come out of the locking portion 54a. Further, the locking arm 55b of the lock lever 55 is provided with a rising protrusion 55e.

The hook-shaped engaging portion 54a provided on the locking rotating member 54 does not engage with the claw 55d of the lock lever 55 in the rotation direction following the film winding of the intermittent sprocket 27, so that the intermittent sprocket 27 does not film. It is formed in such a direction as to engage with the hook-shaped claw 55d and freely engage with the hook-shaped claw 55d by being driven to rotate in the opposite direction to the rotation direction at the time of rewinding.

The pawl 55d engages with the engaging portion 54a at the final stage of film rewinding, and stops the intermittent sprocket 27 at a predetermined initial position. This initial position is slightly rotated in the direction in which it is rotated following the film winding from the frame stop position, and the pair of teeth 27a, 27b is out of the pair of perforations 14, that is, the teeth 27a, 27b are out of the film passage. It is set to the retracted position.

The rotating member 54 for locking is used when the intermittent sprocket 27 rotates in the film winding direction.
The outer peripheral surface 54b presses the claw 55d to press the lock lever 5
The shape is such that 5 is rotated toward the retracted position.

The lock lever actuating cam 57, which is integrally formed on the back surface of the counter plate 49, has a clearance C 57 C.
It has a ring shape. Then, during rewinding of the film 12, the two teeth 27a, 27 of the intermittent sprocket 27 are
After b is separated from the two most perforations 14a and 14b on the front side of the film 12, the film front end 1
The lock lever actuating cam 57 has its clearance 57b before the 2a is disengaged from the intermittent sprocket 27, that is, immediately before the counter plate 49 returns to the start position, for example, the position where the symbol "S" is displayed on the display window 58. Is positioned within the rotation locus of the rising protrusion 61b of the lock lever 55 to allow the lock lever 55 to rotate to the lock position. In other cases, that is, when the film 12 is passing through the intermittent sprocket 27, the lock lever actuating cam 57 engages the rising protrusion 55e of the lock lever 55 with the inner wall surface 57a of the C ring,
It is configured to prevent the lock lever 55 from rotating to the lock position.

The lock lever urging projection 56, which is integrally formed with the lock lever actuating cam 57 on the back surface of the counter plate 49, has the elastic arm of the lock lever 55 immediately before the counter plate 49 during film rewinding returns to the start position. 55c is pressed to urge the lock lever 55 toward the lock position. Due to this urging, immediately before the film front end 12a is separated from the intermittent sprocket 27 during the rewinding of the film 12, the clearance 57 of the lock lever actuating cam 57 is formed.
At the same time that b is positioned in the rotation locus of the rising protrusion 55e of the lock lever 55, the rotation of the lock lever 55 to the lock position is permitted. Then, when the counter plate 49 returns to the start position, the claw 55 of the lock lever 55
d engages with the locking portion 54a of the locking rotary member 54 (FIG. 9), and the intermittent sprocket 27 is locked at the initial position.
That is, the locking portion 54a, together with the claw 55d of the lock lever 55, constitutes a reverse rotation preventing member that prevents rotation of the intermittent sprocket 27 in the reverse rotation direction following the film rewinding.

On the other hand, when the intermittent sprocket 27 is at the top fixing position, the groove 34a of the winding stopping rotation member 34 is formed.
Is located within the rotation locus of the engaging end portion 35a of the locking lever 35. During this time, shutter charging is performed, and the shutter drive lever 36 rotates to the charging position,
The locking lever 35 rotates toward the winding stop position, and its engaging end portion 35a engages with the groove 34a of the winding rotation member 34 to prevent the intermittent sprocket 27 from rotating. Groove 3
4a is wide in the direction of rotation when the film is rewound. Therefore, even when the intermittent sprocket 27 is at the above-mentioned predetermined initial position, the groove 34a is positioned within the rotation locus of the engaging end portion 35a of the locking lever 35, and the film rewinding operation member 52 is in the normal position. When returned to, lock lever 3
5 rotates to the unwinding position, and the engaging end portion 35a engages with the groove 34a of the unwinding rotary member 34. That is, the groove 34a, together with the engaging end portion 35a of the locking lever 35, constitutes a forward rotation blocking member that blocks rotation of the intermittent sprocket 27 in the forward rotation direction following the film winding.

Further, when the intermittent sprocket 27 is at the initial position, the shutter charge cam 33 stops at a position past the rotation locus of the engaging end portion 36a of the shutter drive lever 36, so that the shutter is driven by the subsequent shutter release. The lever 36 can be rotated to the release completion position, and the load generated by the biasing force of the torsion spring 37 is not applied to the intermittent sprocket 27.

Next, FIG. 7 shows a control circuit of the motor 24, and FIG. 8 is a timing chart thereof.

In this circuit, the capacitor 24b is interposed between the battery 24a which is the power source of the film winding / rewinding motor 24 and the motor drive circuit. By ON operation of the switch 40 due to the depressing operation of the shutter button 39 at time t ₁ shown in FIG. 8, the contact 40a of the switch 40, the inter-40b is connected, charging of the capacitor 24b is started, time t ₂ When the switch 40 is turned off in response to the end of the pressing operation of the shutter button 39 in FIG.
40c are connected, the charging circuit for the capacitor 24b is disconnected, and the charging voltage is applied to the base of the transistor 24c.

Further, the switch 46 is arranged so that when the shutter lever 39 is pushed down at the time point t ₁ and the locking lever 35 is rotated to the unwinding release position, the locking lever 35 is rotated.
When the shutter button 39 is pressed down at the time t ₂ , the switch 4 is turned on to connect the contacts 46a and 46b.
When the zero contacts 40a and 40c are connected, the transistors 24c and 24d of the motor drive circuit are turned on by the charging voltage of the capacitor 24b, the normal rotation drive of the motor 24 is started, and the film is wound up one frame.

Then, at the time t ₃ when the winding of one frame of the film is completed, the film winding stopping mechanism is operated and the locking lever 35 is rotated to the position shown in FIG. 10, whereby the switch 46 is turned off. Become switch 46
The contacts 46a and 46c are connected to each other so that the normal rotation drive of the motor 24 is stopped.

By the way, in film winding after the last frame of the film has been photographed, the intermittent sprocket 27 does not rotate, the film winding stopping mechanism does not operate, and the switch 46 does not turn off. Therefore, the capacitor 24b is provided as a timer for automatically stopping the normal rotation drive of the motor 24 even if the switch 46 is not turned off, and the voltage charged in the capacitor 24b drops to a certain level. forward drive is configured to automatically stop the motor 24 at the time t ₄ when the.

When the motor forward / reverse rotation changeover switch 53 is switched to the reverse rotation side by the rewinding operation member 52, the motor 24 is reversely driven to rewind the film 12, and after rewinding the film, the rewinding operation member 52 is rewound. When the film is returned to the original position, the film winding mechanism operates to stop the motor 24.

Next, the operation of the film feeding mechanism having the above structure will be described in more detail with reference to FIGS.

When the bottom lid of the camera is opened and the film cartridge 10 is loaded and the bottom lid is closed, the light-shielding door drive shaft 23 rotates in conjunction with this closing operation, and the cartridge main body 11
Rotate the light shielding door of to the open position. At this time, the counter plate 4
9 has been returned to the start position. When the counter plate 49 is at the start position, as shown in FIG. 9, the gap portion 5 of the cam 57 formed on the back surface of the counter plate 49.
7b is positioned within the rotation locus of the rising protrusion 55e of the lock lever 55, and the lock lever biasing protrusion 56 presses and biases the elastic arm 55c of the lock lever 55, whereby the lock lever 55 is locked to the locked position. Turn to
The claw 55d is the locking portion 54a of the locking rotary member 54.
To prevent the cam shaft 32 from rotating clockwise,
This prevents the intermittent sprocket 27 from rotating counterclockwise. The intermittent sprocket 27 is stopped at the initial position where the pair of teeth 27a and 27b are retracted from the feeding path of the film 12 along the driven direction.

At this time, in the film winding stop mechanism and the shutter charge mechanism, as shown in FIG. 10, the locking lever 35 is in the winding stop position, and the engagement end portion 35a of the locking lever 35 is in the state. It is engaged in the groove 34a of the unwinding rotary member 34 to prevent the cam shaft 32 from rotating in the counterclockwise direction, thereby preventing the intermittent sprocket 27 from rotating in the clockwise direction. Also, the locking lever 35
The shutter drive lever 3 with its falling protrusion 35d.
The shutter drive lever 36 is held at the charging position by intervening in the rotation locus of the rising protrusion 36c of No. 6.

The first film winding operation is started by pressing down the shutter button 39. When the shutter button 39 is pushed down at the time point t ₁ in FIG. 8, the switch 40 is turned on and the contacts 40a and 40b shown in FIG. 7 are connected, so that the capacitor 24b is charged by the voltage of the power supply battery 24a. To be done.

On the other hand, when the shutter button 39 is pushed down, the rod 39a pushes the locking lever 35 counterclockwise to rotate it to the unwinding release position. then,
As shown in FIG. 11, the falling protrusion 35 d of the locking lever 35 is the rising protrusion 36 of the shutter drive lever 36.
Since the shutter drive lever 36 is released from the turning trajectory of c, the holding of the shutter drive lever 36 at the charge position is released, and the shutter drive lever 36 instantaneously rotates counterclockwise to kick the shutter blade 42, but the film 12 Cartridge body 1
Since it is not delivered from within 1, the film 12 is not exposed. Then, the shutter drive lever 36 moves to the release completion position and holds the locking lever 35 at the unwinding release position.

As shown in FIG. 11, when the locking lever 35 is rotated to the unwinding release position, the switch 46 is turned on. Then, at time t ₂ in FIG. 8, when the shutter button 39 returns from the depressed position to the original position, the switch 40
Is turned off and the contacts 40a and 40c are connected, so that the charge to the capacitor 24b is cut off and the transistor 24 is turned on by the terminal voltage of the capacitor 24b.
The motors 24 are driven in the normal direction by connecting c and 24d. As a result, the initial winding of the film 12 is started. In this case, the length of the film 12 from the film front end 12a to the first perforation 14a is longer than the feeding length L1 + L2 for one frame.

The film 12 delivered from the inside of the cartridge main body 11 by the normal rotation driving of the motor 24 is transferred toward the winding chamber while pushing the film end detecting claw 50 to the retracted position by the taper portion 12c of the film front end 12a. It is wound around the winding shaft 25. By this film feeding, the intermittent sprocket 27 is driven to rotate clockwise, and the preceding tooth 27 of the pair of teeth 27a and 27b is reached until the perforation 14a reaches.
In the state where a is in contact with the film 12, the rubber member 28 slips on the film 12 and allows the film 12 to be fed.

When the film 12 is subsequently fed,
The first perforation 14a arrives and the preceding tooth 2
7a engages the perforations 14a, then the leading teeth 27a disengage from the perforations 14a and the trailing teeth 27b engage the next perforations 14b to the intermittent sprocket 27 top stop position in the condition shown in FIG.

During this time, the shutter charge cam 3
3 rotates the shutter drive lever 36 in the clockwise direction, and when the shutter drive lever 36 rotates to the charge position, the rising protrusion 36c is disengaged from the rotation locus of the falling protrusion 35d of the locking lever 35. As a result, the locking lever 35 is rotated clockwise toward the winding stop position by the urging force of the torsion spring 37. At this time,
The falling protrusion 35d of the locking lever 35 intervenes in the rotation locus of the rising protrusion 36c of the shutter drive lever 36 to hold the shutter drive lever 36 at the charge position (FIG. 10).

When the locking lever 35 is rotated toward the winding stop position, the rotation of the locking lever 35 is stopped at the position where the engaging end portion 35a of the locking lever 35 abuts on the outer circumference of the rotation stopping member 34. When the intermittent sprocket 27 rotates to the top stop position, the engagement end portion 35a engages with the groove 34a, and the locking lever 35 rotates to the winding stop position. When the locking lever 35 is rotated to the winding stop position, the switch 40 is turned off to connect the contacts 46a and 46c shown in FIG.
At a time point t ₃ shown by, the forward rotation drive of the motor 24 is stopped. As a result, the film winding stop mechanism and the shutter charge mechanism return to the state shown in FIG. 10, and the initial film winding is completed. Then, the first frame 15a is set in the aperture 17.

In the cowounder mechanism, the one-tooth gear 48 advances the counter plate 49 by one graduation by the rotation of the intermittent sprocket 27 during the initial film winding, and when the first top 15a is set, As shown in FIG. 12, the number of frames to be photographed “1” is displayed in the display window 58.

The lock mechanism causes the lock lever urging projection 5 to move by the stepping of the counter plate 49 during the initial film winding.
6 slightly rotates in the direction away from the elastic arm 55c of the lock lever 55 (clockwise direction), and the bias against the lock lever 55 is relaxed. Since the rotation of the intermittent sprocket 27 during the initial film winding is transmitted to the lock rotating member 54, the lock lever 55 is in a state in which the outer peripheral surface 54b of the rotating member 54 is pushed to the retracted position by pressing the claw 55d. . This allows
The rising protrusion 55e of the lock lever 55 is engaged with the clearance 57b of the lock lever actuating cam 57. Moreover, the one end surface 5 forming the clearance 57b of the cam 57 is formed by the stepping of the counter plate 49 during the initial winding of the film.
7c (the end surface facing the rotation direction when the counter plate 49 steps clockwise) engages the rising protrusion 55e,
The lock lever 55 is prevented from rotating toward the lock position. The end surface 57c has a rising protrusion 55e.
Is formed into a tapered surface so as to smoothly enter into the inner wall surface 57a of the cam 57.

After that, when the shutter button 39 is pushed down, as shown in FIG. 11, the falling piece 35c of the locking lever 35 is pushed by the rod 39a.
Is pressed and rotated toward the unwinding release position, and during this rotation, the engagement between the rising protrusion 36c of the shutter drive lever 36 and the falling protrusion 36d of the locking lever 35 is released to drive the shutter drive. The lever 36 is rotated toward the release completion position by the urging force of the torsion spring 37. Then, during this time, the kicking piece 36b of the shutter drive lever 36 kicks the shutter blade 42 to perform exposure.

When the shutter drive lever 36 is rotated to the release completion position, it holds the locking lever 35 in the unwinding release position as described above, so that the next film winding is permitted. , Switch 4
6 is ON.

When the depression of the shutter button 39 is released, the switch 40 is turned off and the normal rotation driving of the motor 24 is started. By the normal rotation driving of the motor 24, the spool 13 in the cartridge body 11 is rotated in the film feeding direction by the drive shaft 20, and the film 12 is fed. Then, when the intermittent sprocket 27 makes one rotation, the frame stop position is restored again, and after the film winding is stopped, the drive of the motor 24 is stopped.
As a result, the second frame 15b is set in the aperture 17, and during this time, the shutter charge and the counter plate 4 are
9 steps of one scale are performed.

In the lock mechanism, as shown in FIG. 13, the step of the counter plate 49 during film winding causes the lock lever urging projection 56 to rotate in the direction away from the elastic arm 55c of the lock lever 55. The biasing force on the lock lever 55 almost disappears. Further, as the counter plate 49 advances while the film is being wound, the inner wall surface 57a of the lock lever actuating cam 57 enters the outside (the cam shaft 32 side) of the rising protrusion 55e of the lock lever 55, and the lock lever 55 is set to the lock position. It prevents it from turning toward.

In the same manner as described above, the film is wound up only by pressing down the shutter button 39,
You can take pictures one after another. Then, during the final film winding after the shooting of the last frame 15m is completed, the film end detection claw 50 engages with the perforation 16 to prevent the transfer of the film 12 in the feeding direction. Then, forward rotation of the motor 24 is stopped when the voltage stored in the capacitor 24b is effectively up to a certain level (time t ₄ in FIG. 8).

At the time when the final winding of the film 12 is completed, as shown in FIG. 14, the counter plate 49 displays the prescribed number of images, for example, “40” in the display window 58.
At this time, the inner wall surface 57a of the cam 57 is locked by the lock lever 5
The state in which the rotation of the No. 5 to the lock position is prevented continues.

After confirming this display, the photographer slides the film rewinding operation member 52 in the direction of arrow B shown in FIG. By this operation, the rewinding operation member 5
The two pressing portions 52a and 52b of the second pressing portion 35b and 36e of the locking lever 35 and the shutter driving lever 36, respectively.
Are pressed to hold the locking lever 35 in the unwinding release position and the shutter drive lever 36 in the charging position, respectively. As a result, the connection state of the intermittent sprocket 27 to the film winding mechanism and the shutter charging mechanism is cut off, and the intermittent sprocket 27 becomes free. At this time, the switch pressing portion 52c of the rewind operation member 52 switches the motor forward / reverse rotation changeover switch 53 to the reverse rotation side.

When the switch 53 is switched to the reverse rotation side, the reverse rotation drive of the motor 24 is started, the spool drive shaft 20 rotates in the winding direction, and the film 12 is stored in the cartridge body 11. At this time, the intermittent sprocket 27 rotates following the rewinding direction of the film 12, and rotates in the direction opposite to that when the film is wound while meshing with the perforation 14. The rotation of the intermittent sprocket 27 is transmitted to the counter mechanism, and the one tooth gear 4 is rotated.
8 returns the counter plate 49 toward the start position. During this time, the inner wall surface 57a of the lock lever actuating cam 57
Keeps the lock lever 55 from rotating to the lock position.

When the film rewinding is continued and the counter plate 49 is returned to the position where the number of photographed frames "1" is displayed on the display window 58, as shown in FIG. 16, the first frame 15a of the film 12 is displayed. The teeth 27b of the intermittent sprocket 27 have passed through the aperture 17 and are engaged with the perforations 14b. At this time, the counter plate 4
The lock lever urging protrusion 56 of 9 presses the elastic arm 55c of the lock lever 55 to urge the lock lever 55 toward the lock position, but the end surface 57c of the clearance 57b of the cam 57 is a rising protrusion of the lock lever 55. Since the lock lever 55 is engaged with the lock lever 55e, the lock lever 55 is maintained in the locked position.

The lock lever urging projection 5 at this time
Since the pressing force of 6 is absorbed by the elastic deformation of the elastic arm 62, the lock lever 55 is not damaged.

Next, since the perforations 14b and 14a sequentially pass, the intermittent sprocket 27 rotates counterclockwise while meshing, and during this rotation, the one-tooth gear 48 returns the counter plate 49 by one scale, and the counter plate 49 is rotated. 49 is the start position. By returning the counter plate 49 to the start position, the clearance 57b of the cam 57 is formed.
Intervenes in the rotation locus of the rising protrusion 55e of the lock lever 55. Therefore, the rotation of the lock lever 55 to the lock position is allowed, and further, the stepping of the counter plate 49 causes the lock lever urging projection 56 to move to the elastic arm 55.
Since c is further elastically deformed, the lock lever 55
Rotates instantly towards the locked position. At this time, the locking rotary member 54 is rotating clockwise in conjunction with the rotation of the intermittent sprocket 27. Then, as shown in FIG. 17, when the hook-shaped engaging portion 54 a of the rotating member 54 is engaged with the hook-shaped 55 d of the lock lever 55, the rotating member 5
The clockwise rotation of 4 is locked, and the counterclockwise rotation of the intermittent sprocket 27 is locked through the locking of the rotating member 54. In this state, the rubber member 28 of the intermittent sprocket 27 is in contact with the film 12, and the film 12 is not rewound after that.
Are allowed by slipping on the surface of the rubber member 28.

When all the film 12 which has been photographed is stored in the cartridge main body 11, the load on the motor 24 is reduced and the motor sound changes. This change in sound makes the photographer feel uncomfortable, and the display on the display window 58 can be visually recognized. The photographer recognizes that "S" is displayed on the display window 58, so that the rewind operation member 52 is displayed.
Is slid in the direction opposite to the arrow B direction shown in FIG. 15 to end the film rewinding operation.

When the rewinding operation member 52 is slid, the state shown in FIG. 15 returns to the state shown in FIG. 10, which is the initial state of the film winding mechanism and the shutter charge mechanism. That is, the two pressing portions 52a and 52b of the rewinding operation member 52 release the pressing of the locking lever 35 and the shutter drive lever 36 on the pressing receiving portions 35b and 36e, respectively. Of these, since the pressing portion 52a is an inclined surface, the pressing of the pressing portion 52a is released earlier than the pressing portion 52b. Therefore, the locking lever 35 is swung quickly toward the winding stop position by the urging force of the torsion spring 37.

In this case, the intermittent sprocket 27 is locked at the regular stop position by the lock lever 55, and the engaging end portion 35a of the locking lever 35 is engaged with the groove 34a of the winding stopping rotation member 34. Since the obtained angular position is maintained, the locking lever 35 can be rotated to the winding stop position by the urging force of the torsion spring 37, and accordingly, the switch 4
6 is turned off, and the reverse rotation drive of the motor 24 is stopped.

Then, the locking lever 35 is swung to the winding stop position quickly, whereby the shutter drive lever 36 is rotated.
Is rotated by the urging force of the torsion spring 37 toward the release completion position, the falling protrusion 35d of the locking lever 35 enters the rotation locus of the rising protrusion 36c of the shutter drive lever 36. The shutter drive lever 36 is held in the charge position and the state shown in FIG. 10 is obtained. The forward / reverse changeover switch 53 is switched to the forward rotation side by sliding the rewind operation member 52.

In this state, since the engaging end portion 35a of the locking lever 35 is engaged in the groove 34a of the winding stopping rotation member 34, the rotation (normal rotation) of the intermittent sprocket 27 following the film winding is performed. ) Is blocked. As a result, the intermittent sprocket 27 is reliably held at the initial position by the forward stop of the locking lever 35 and the reverse rotation of the lock lever 55. There is no danger of shifting from the initial position.

Particularly, the claw 55d of the lock lever 55 has a hook shape, and the locking portion 54a of the rotating member 54 has the claw 5d.
By being formed into a hook shape that can engage with 5d freely, it is possible to more reliably and firmly position the intermittent sprocket 27 at the end of film rewinding.

After the film rewinding is completed, the lid of the cartridge chamber of the camera body is opened, and the film cartridge 10 that has been photographed is taken out. At this time, the light-blocking door drive shaft 23 rotates in conjunction with the unlocking operation of the key member that locks the lid of the cartridge chamber, and rotates the light-blocking door of the cartridge body 11 to the closed position. Therefore, even if the film cartridge 10 is taken out from the camera body, there is no possibility that the film 12 that has been photographed will be covered with light.

If the shutter release operation is performed without loading the film cartridge 10, the film winding mechanism and the shutter charge mechanism will be in the state shown in FIG. 11, and the motor 24 will be driven in the normal direction immediately after the shutter release is completed. However, since the film cartridge 10 is not loaded, the intermittent sprocket 2
7 and the counter plate 49 do not rotate normally from the state shown in FIG. On the other hand, the forward rotation of the motor 24 is also performed by the condenser 2
There is no problem because it automatically stops when the voltage charged in 4b drops to a certain level. However, for example, the capacitor 24b is short-circuited when the cartridge is not loaded, and the capacitor 24b is activated when the film cartridge 10 is loaded.
If a switch for automatically canceling the short circuit of 4b is provided, the motor 24 is not driven because the capacitor 24b is not charged when the cartridge is not loaded. Therefore, it is possible to prevent unnecessary current consumption and extend the life of the power supply battery 24a.

When the shutter release operation is performed when the film cartridge 10 is not loaded, the film winding stopping mechanism and the shutter charging mechanism move the locking lever 35 to the winding stopping releasing position as shown in FIG. Although 36 is in the release completion position, the motor 24 is normally driven immediately after the shutter release operation after the film cartridge 10 is loaded, and the intermittent sprocket 27 is normally rotated by the delivered film 12. There is no problem because the shutter charge is performed by the rotation until the frame stop position is reached.

In the embodiment of the camera according to the present invention described above, the intermittent sprocket 27 is rotated once for the film 1 rotation.
Although it is configured to carry out frame transfer, the present invention is not limited to this, and a film feeding mechanism of a type for carrying out film one frame transfer by half rotation of the intermittent sprocket may be used. In that case, the teeth 27 arranged at short intervals
Two pairs of a and 27b should be installed on the circumference of the intermittent sprocket 27.
The projections may be provided at positions separated by 80 °. Further, as the shutter charge mechanism, it is necessary to provide two shutter charge cams that push up the shutter drive lever 36 to the charge position by half rotation of the intermittent sprocket at positions separated by 180 ° on the circumference. Further, as the film winding stopping mechanism, the two grooves are separated by 180 ° on the circumference of the winding stopping cam 34 so that the engaging end portion 35a of the engaging lever 35 is engaged by half rotation of the intermittent sprocket. It is necessary to install it in a different position.

[Brief description of drawings]

FIG. 1 is a front view showing a film used in a camera according to the present invention in a state where a film is pulled out from a cartridge main body.

FIG. 2 is a perspective view schematically showing a film winding and rewinding mechanism in an embodiment of a camera according to the present invention.

FIG. 3 is a sectional view taken along a plane perpendicular to the axis of the intermittent sprocket.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a sectional view taken along the line VV in FIG. 3;

FIG. 6 is an exploded perspective view schematically showing a film feeding mechanism in an embodiment of a camera according to the present invention.

FIG. 7 is a circuit diagram showing a drive circuit of the film feeding motor.

8 is a timing chart used to explain the operation of the circuit of FIG.

9 is an explanatory view showing initial states of an intermittent sprocket, a lock mechanism and a counter mechanism in the film feeding mechanism of FIG.

10 is an explanatory view showing initial states of a film winding mechanism and a shutter charge mechanism in the film feeding mechanism of FIG.

11 is an explanatory diagram showing a state after completion of release of the film winding mechanism and the shutter charge mechanism of FIG.

FIG. 12 is an explanatory view showing the states of the intermittent sprocket, the lock mechanism, and the counter mechanism when the first frame of the film is set on the aperture.

FIG. 13 is an explanatory view showing the states of the intermittent sprocket, the lock mechanism, and the counter mechanism when the second frame of the film is set on the aperture.

FIG. 14 is an explanatory diagram showing the states of the intermittent sprocket, the lock mechanism, and the counter mechanism when the film winding is prevented after the shooting of the last frame of the film is completed.

FIG. 15 is an explanatory diagram showing states of a film rewinding mechanism and a shutter charge mechanism when a film rewinding operation is performed.

FIG. 16 is an explanatory view showing the states of the intermittent sprocket, the lock mechanism, and the counter mechanism while the perforation corresponding to the first frame is passing by the film rewinding.

FIG. 17 is an explanatory view showing states of the intermittent sprocket, the lock mechanism, and the counter mechanism when the film front end is disengaged from the intermittent sprocket by rewinding the film.

[Explanation of Codes] 10 Film Cartridge 11 Cartridge Body 12 Film 14, 16 Perforation 24 Motor 27 Intermittent Sprocket 27a, 27b Intermittent Sprocket Tooth 28 Rubber Member 34 Roll Stop Rotating Member 35 Locking Lever 36 Shutter Drive Lever 48 One Tooth Gear 49 Counter Plate 54 Lock Rotating Member 54a Lock Rotating Member Locking Part 55 Lock Lever 55c Lock Lever Elastic Arm 55d Lock Lever Claw 56 Lock Lever Energizing Protrusion 57 Lock Lever Actuating Cam

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Hiroshi Soma 3-11-46 Izumi, Asaka-shi, Saitama Prefecture Fuji Shashin Film Co., Ltd.

Claims (5)

[Claims] 1. A camera using a film having a perforation row in which a long interval defining the length of each frame in the film feeding direction and a short interval defining the interval between the frames are alternately provided. Teeth engaging the perforations of the film are provided on the outer peripheral surface so that the outer peripheral surface frictionally engages with the film to be fed, and the friction rotation area in which the outer peripheral surface is driven to rotate, and the teeth engaging the perforations. And an intermittent sprocket having an engagement rotation range that is driven by rotation, and at the time of film winding, the intermittent sprocket rotates one step at a time from the start position as the intermittent sprocket rotates while the film is being fed by one frame. When the number of frames to be shot is displayed and the film is rewound, the above-mentioned star And a lock mechanism that locks the intermittent sprocket at a predetermined position by detecting that the counter plate has returned to the start position when the film is rewound. A camera to do. 2. The lock mechanism includes a locking portion at a predetermined angular position on an outer peripheral surface thereof, the locking rotating member rotating in conjunction with the intermittent sprocket, and the locking portion of the rotating member. A pawl is provided so as to be rotatable between a lock position where the rotary member can be locked by engagement of the pawl with the locking portion and a retracted position where the pawl cannot engage with the locking portion. A lock lever that locks the intermittent sprocket at a predetermined position by locking the rotating member; and a lock lever that locks the lock lever at the retracted position when the counter plate is at a position other than the start position. 2. The turtle according to claim 1, further comprising: a cam member that opens the lock lever when returning to the start position and allows rotation of the lock lever to the lock position. La. 3. The claw of the lock lever has a hook shape, and the locking portion of the rotating member is formed in a hook shape that can engage with the claw freely. The camera described in 2. 4. The camera according to claim 2, wherein the cam member is provided on the counter plate. 5. The lock lever integrally includes an elastic arm, and the counter plate is provided with a lock lever urging projection capable of engaging with the elastic arm when the counter plate is returned to the start position. 5. The camera according to claim 4, wherein the lock lever urging projection engages with the elastic arm to elastically deform the elastic arm, thereby applying an urging force toward the lock position to the lock lever.