JPS6257977B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motor drive device for setting a shutter and winding a film using a motor built into a camera.

Various motor drive cameras have already been proposed, but all of them have complex mechanisms and large external dimensions.

In order to obtain a relatively large output torque, a geared motor has been developed in which the central rotating shaft of the motor body is decelerated by a reduction gear train built into the same casing, and the output is output from the same output shaft as the motor's rotating center. .

Since the rotational speed of the output shaft of this motor is geared down and is not large, it is excellent in that there is no need to use a separate reduction gear train.

The present inventors performed various processing on the casing of such a geared motor and noticed that by making the motor casing itself function as a take-up spool, it was possible to downsize the camera and simplify the motor drive mechanism.

An object of the present invention is to provide a motor drive device that can reduce the size of a camera by driving a simple mechanism using a geared motor.

To achieve the above object, a motor drive device according to the present invention includes a geared motor in which the rotation of the rotating shaft of the motor relative to the casing is coupled to an output shaft via a reduction mechanism provided in the casing, and a film winding motor. A casing support structure rotatably supports a cylindrical casing of the motor, which also serves as an upper cylinder, in a film winding chamber of a camera body, and a casing support structure that is connected to an output shaft of the geared motor and rotates the output shaft with respect to the camera body to drive the shutter. a casing locking mechanism that detects the amount of film fed and prevents rotation of the casing when a certain amount is reached;
A release mechanism that releases the lock of the casing locking mechanism in conjunction with the shutter charge of the shutter charge mechanism, and a power receiving section provided in the casing of the motor to supply current in conjunction with the shutter release to perform shutter charge and film winding. It consists of a current supply section that cuts off the current in conjunction with the upper end.

The motor drive device according to the present invention will be explained in more detail below with reference to the drawings and the like.

FIG. 1 is a perspective view showing a motor drive device according to the present invention.

In the figure, 42 is a film cartridge, 40 is a film, and 41 is a film aperture provided in a camera body (not shown). A geared motor 1 is rotatably provided within a film winding chamber within a camera body. The configuration and support structure of this geared motor 1 will be explained with reference to FIG. 14. In FIG. 14A, reference numeral 1e denotes a motor body, which is inserted and fixed within a cylindrical casing 1h.

The central shaft of the motor 1e, which rotates at high speed, is connected to the output shaft 1g via a reduction gear train 1f provided in the same casing 1h. Therefore, the rotation of the central shaft of the motor body 1e is transmitted to the output shaft 1g at a reduced speed. In this embodiment, the geared motor 1 used has a rotation of 8000 rpm of the central axis of the main body 1e reduced to 1/76 by a reduction gear train 1f and transmitted to the output shaft. The diameter of 1h is 18 mm, which is almost the same as the diameter of a conventional spool. A gear 1a is provided at the lower end of the casing 1h, and the output shaft 1g passes through a hole in the center of the gear 1a and projects downward.

The lower end surface of the gear 1a is supported by a ball bearing 47 provided on a base plate 44 fixed to the camera body, and the protrusion 1k at the center of the upper end of the casing 1h is supported by a bearing 46 provided on the upper base plate 43. Rotatably supported. As a result, the geared motor 1 itself is rotatably supported by the camera body. The upper side of the casing 1h is made of at least an insulating material, and is provided with two power receiving rings 1d. This power receiving ring 1d is connected to a terminal of the motor body 1e inside the casing. The contact piece 32 is a power supply contact piece provided on the camera body side, and is connected to a power source such as a battery via a polarity switching circuit or switch (ExSw) and a power switch (PwSw) (not shown).

The casing 1h has a film winding claw 1b and a rewinding stop claw 1 used when rewinding the film.
c is provided. This winding claw 1b is provided for the purpose of automatic film loading.
When automatic loading is not performed, it is not necessarily necessary to use this shape, and an insertion hole for locking the film leading end or a pressing spring may be provided on the surface of 1h.
The shape of the rewind stop pawl 1c is better shown in FIGS. 16 and 17. A shutter charge cam 2 is fixed to the lower end of the output shaft 1g.

FIG. 14B is a diagram showing another example of a support structure for the geared motor 1. The lower end of the gear 1a is supported by a bearing 47, and the lower end of the shutter charge cam 2 coupled to the output shaft 1g is further supported by a bearing 48 provided on another base plate 45.

In any of the support structures, the geared motor 1 itself is rotatably supported on the camera body.

In the present invention, since the geared motor itself is rotatably supported in this way, the motor body 1
When the output shaft 1g is fixed to the body while a current is supplied to the casing 1h, the casing 1h rotates with respect to the body. Conversely, when the casing 1h is fixed relative to the body, the output shaft 1g rotates relative to the body. More specifically, the one that receives less restraint in relation to the body will rotate. The present invention skillfully takes advantage of this point, and when the casing is being held in speed, the output shaft 1g is rotated to perform shutter setting, and when the shutter setting is completed, the output shaft 1g is being held in speed to rotate the casing, and the film is set. This is for winding.

Various other operations can also be solved by basically developing this principle.

Next, the shutter charge mechanism will be explained.
The shutter charge mechanism is arranged below the geared motor 1 shown in FIG.

Figures 7, 8, 9, 10, and 11 show the shutter charge mechanism as viewed from the bottom side of the camera. As shown in each figure, the shutter charge cam 2 is a cam with an egg-shaped outer shape, and as mentioned above, it is fixed to the output shaft of the geared motor 1, and has an overrunning clutch on the bottom. A casing stopper release pin 2b is provided on the upper side of the roller 2a.

The shutter charge lever 21 is pivotally fixed to a pin 53, and as shown in FIG. 8, a counterclockwise rotational force is applied by a spring. It is pressed against the cam surface of cam 2.
When the output shaft 1g rotates clockwise as shown by the arrow from the position shown in FIG. 8 and the shutter charge lever 21 is pushed clockwise as shown in FIG. 10, a shutter (not shown) is set.

Next, the single-frame indexing casing locking mechanism will be explained. Typical winding in the motor drive system of the present invention is not accomplished by a sprocket coupled to the perforations of the film to provide metered feed as in conventional cameras. The casing 1h of the geared motor 1 described above pulls out the film, detects that the indexing side has pulled out one frame, and prevents rotation of the casing.

The single index casing locking mechanism includes a sprocket 11a shown in FIG. The sprocket 11a is normally rotated while being connected to the perforation of the film 40 which is drawn out by the rotation of the casing 1h during winding.

During automatic loading, this sprocket 11a actively contributes to film feeding as will be described later, but during normal winding, it simply functions as a perforation counter.

Therefore, when forming a non-self-loading camera according to the invention, the sprocket is not necessarily necessary, and the function as a perforation counter can be realized by other structures, such as a photoelectric device.

An indexing cam 11b is integrally provided at the lower end of the shaft that supports the sprocket 11a.

FIGS. 3, 4, and 5 are plan views illustrating the operation of the single-frame indexing casing locking mechanism. The film stop connecting plate 25 has a long hole in its midsection, and a pin 50 provided on the camera body side.
3, and is biased toward the left in FIG. 3 by a spring 26. Film stopper claw 23
is rotatably pivoted by a pin 52, and a spring 27
A rotational force is applied in the direction in which the claw 23a at the tip is coupled to the gear 1a which is integral with the casing 1h. The film stopper hook 24 is connected to the pin 51
3, and a spring 28 applies a rotational force in the counterclockwise direction in FIG. Locks the film winding pawl 23 when winding the film, etc.
At the end of winding, the film is placed on the film winding connection plate 25, the winding pawl 23 is released, and the film 23a is connected to the gear 1a to lock the casing 1h. The above-mentioned sprocket 11a, index cam 11b, film winding connecting plate 25, film winding claw hook 24, film winding claw 23, and gear 1a form a one-frame indexing casing locking mechanism.

The operation when winding the film is roughly as follows. When the sprocket 11a rotates once, the indexing cam 11b pushes the connecting plate 25, and the stopper hook 24
is rotated to connect the tip 23a of the stopper pawl to the gear 1a.

In the apparatus according to the present invention, when the film is fed one frame, the casing 1h is locked by the one frame indexing casing locking mechanism.

Therefore, it is necessary to release this lock for the next winding. A film feed stop release mechanism for this purpose is linked to the above-mentioned shutter charge mechanism to release the locking of the casing 1h by the one-frame indexing casing locking mechanism after the shutter charge is completed. The film feed stop release mechanism includes a pin 2b mounted on the shutter charge cam 2 and a film stop release lever 22. The film unwinding release lever 22 is the first
As shown in FIG. 1, it is rotatably provided around a shaft 54. When the pin 2b provided on the shutter charge cam 2 pushes the lever 22 counterclockwise in FIG. Rotate it in the direction away from the gear 1a to release the lock (see Fig. 5).

In this embodiment, the motor current is cut off every time one frame of film is wound. The automatic current supply stop mechanism to the motor includes a roller 2a provided on the shutter charge cam 2, an overrunning clutch lever 20, and a motor stop switch 30 controlled by this lever.

As shown in FIG. 7, the lever 20 is rotatably provided around a shaft 55, and a clockwise rotational force is applied by a spring 29. Lever 2
The tip of 0 can be engaged with the roller (overrunning clutch roller) provided on the shutter charge cam 2 with the slopes on both sides and the tip 20a. When pushed up by the roller 2a as shown in FIG. 9, it functions to close the switch 30.

When this switch 30 is closed, the circuit connected to this switch cuts off the current to the motor 1.

This embodiment of the apparatus is capable of not only normal film winding but also automatic film loading and rewinding. Therefore, the rotation of the casing 1h of the motor 1 can be transmitted to a drive mechanism for automatic loading and a drive mechanism for rewinding.

The gear 3 shown in FIGS. 1 and 2,
4, 5, 6, 7, 8, and 9 form a transmission gear train for transmitting the rotation of the gear 1a integrated with the casing 1h to the respective drive mechanisms.

Gear 3 meshes with gear 1a, gear 4 is integral with gear 3, and gear 4 meshes with gear 5. Gears 5 and 6 are integral, and gear 6 meshes with gear 7. Gear 7 meshes with gear 8, and gear 9 is integral with gear 8. The rotation of the casing 1h transmitted by these gear trains is switched and connected to the rewinding system and the automatic loading system via an automatic loading/unwinding switching mechanism including a planetary gear 10 with the gear 9 as a sun gear.

The rewinding drive system includes a gear 12, a gear 13 integrated therewith, and a gear 13, as shown in FIGS. 1 and 2.
Gear 14 coupled to gear 14, Gear 1 coupled to gear 14
The signal is transmitted to a rewinding gear train consisting of five gears.

The gear 15 is integrally provided with a rewind pawl 15a that is coupled to the central shaft of the film cartridge 42.

For automatic loading, a part of the single-piece indexing casing locking mechanism described above is utilized. The gear 11 is provided integrally with the aforementioned sprocket 11a, and when the planetary gear 10 is connected to the gear 11 and transmits the rotation of the casing 1h, the sprocket works to actively pull out the film 40 from the cartridge 42.

FIG. 15 shows the automatic loading/rewinding switching mechanism in detail. In this figure, the planetary gear 10 and the automatic loading side gear 11 are shown in a coupled state. Reference numeral 18 designates a planetary gear spring 10c as a stop ring.

The transmission gear train is designed such that the peripheral speed of the sprocket 11a and the wind speed of the casing 1h during automatic loading are such that the peripheral speed of the sprocket 11h is larger.

This embodiment of the apparatus is provided with an automatic stop mechanism when all film feeding is completed. A switch 31 driven by a pin 23d provided on the stopper claw 23 is a one-frame winding completion detection switch, and the operation of this switch is used to detect the completion of all film feeding. The end of the film 40 is the cartridge 4
Since it is fixed to the central shaft of the motor 2, when the last frame is sent and the next winding is attempted, a large load is applied to the motor casing 1h during the winding, forcing the motor to stop rotating. Since this state does not correspond to the predetermined one-frame feed, the one-frame indexing casing locking mechanism described above does not operate, but the output shaft 1g rotates and the switch 30 closes. Since the switch 31 remains open, the switch logic detects the completion of all film feeding and supplies reverse current to the motor 1 to automatically rewind the film.

Furthermore, this embodiment is provided with a rewinding completion stop mechanism that terminates the entire operation when automatic rewinding is completed.

In Figures 16 and 17, it is pivoted on the body side,
The rewind stop lever 16 is shown biased toward the casing 1h by a spring 17. This lever 16 cooperates with a rewinding stop claw 1c provided on the casing 1h to stop rewinding.

The configuration of each part of this embodiment has been described above in detail.Next, the operation of the circuit that controls the motor 1 will be collectively explained.

In addition to a motor stop switch 30 and a film winding completion detection switch 31, which are shown to control the motor, a shutter operation completion signal generating switch (ShSw), which is not shown, operates when the shutter operation is completed, and a supply current. A switch (ExSw) and a power switch (PwSw) are provided to change the polarity of the switch.

If ShSw works while PwSw is on, motor 1
starts rotating. This is the most common hoisting start condition.

When the one-frame winding completion detection switch 31 is activated and the motor stop switch 30 is turned on, the normal one-frame winding operation is stopped and the motor is stopped. When the one-frame winding completion detection switch 31 is not turned on,
When the motor stop switch 30 is turned on, ExSw
, the circuit switches to a state where a reverse current is supplied to the motor 1, or a reverse current is supplied to the motor.
Then, when the switch 30 is activated, the motor 1 is stopped and rewinding is completed.

The operation of the embodiment device configured as described above is as follows: (1. Automatic loading mode) (2. Normal one-frame winding mode) (3. Automatic stop mode when all films have been wound) (4. Automatic Rewind mode) (5. Automatic stop of automatic rewind) will be explained in this order.

(Auto loading mode) Since this mode is not normal winding, the sprocket 11a in the one-piece indexing casing locking mechanism
Send film 40 using another method. Insert the cartridge 42 into the film supply chamber and insert the film 4.
0 on the sprocket 11a and close the back cover (not shown). At this time, the shutter charge cam 2 and the overrunning clutch lever 20 are in the positions shown in FIG. 1, and the rotation of the output shaft 1g is prevented. In this state, motor 1
When a power source is connected to the motor, the casing 1h of the motor rotates in the direction indicated by the arrow in FIG. 1, and the gear 1a integrated with the casing is rotated. This rotation sequentially rotates the transmission gear trains 3, 4, 5, 6, 7, 8, 9, and rotates the gear 9 in the counterclockwise direction indicated by the arrow in FIG.

The rotation of the gear 9 causes the gear 10, which is a planetary gear, to rotate, thereby rotating the gear 11, which is connected to the gear 10 and is integral with the sprocket shaft. gear 1
1 rotates the sprocket 11a, which is integral with the sprocket shaft, and the film 40 is fed in the direction indicated by the arrow in FIG.

The tip of the film 40 is guided to the casing surface of the motor 1 by a guide mechanism (not shown),
The perforation of the film 40 is engaged with the film winding claw 1b.

As described above, the peripheral speed of the surface of the casing of the motor 1 is greater than the feed speed of the sprocket 11a, so the film 40 is wound at the peripheral speed of the motor casing.

Therefore, the sprocket 11a is pulled by the film and rotated, and the circumferential speed of the sprocket gear 11 becomes greater than the circumferential speed of the planetary gear 10.

As a result, the gear 10, which had been connected to and driven the gear 11, is pushed out of its meshing state. This state is shown in FIG.

The film 40 is thus wound up by the casing 1h of the motor 1, completing automatic film loading.

Thereafter, the gears 3, 4, 5, . . . , 10 of the transmission gear train are in a idling state and do not contribute to film winding. On the other hand, the sprocket 11a will thereafter function as an indexing board for determining the film feed rate.

(Normal one-frame winding mode) FIGS. 4 and 8 correspond to a standstill or standby state in which shutter charging and film winding have been completed and the shutter is waiting for release. When the shutter release is performed and the shutter operation is completed, the motor 1 starts rotating. As shown in FIG. 4, the gear 1a integrated with the casing 1h is locked by a film stopper 23, so that the output shaft 1g rotates with respect to the camera body. This rotation causes the shutter charge cam 2, which is integrated with the output shaft, to rotate in the direction indicated by the arrow in FIG.

This rotation of the shutter charge cam 2 causes the shutter charge lever 21 to move in the direction indicated by the arrow in FIG. 10, and by this operation a shutter (not shown) is set.

As the shutter charge cam 2 continues to rotate, the roller 2b mounted on the cam pushes the film release lever 22 counterclockwise as indicated by the arrow in FIG. 11. By rotating this lever 22,
The pin 22a on the lever 22 is the film stopper claw 23.
in the clockwise direction indicated by the arrow in Figure 5, and press the claw end 2.
3a is separated from the gear 1a. As a result, the motor casing 1h becomes rotatable.

On the other hand, the bent portion 23b of the film rewind pawl 23 is brought to a latchable position by a jaw portion 24a at one end of the film rewind pawl lever 24.

Also, the bent portion 23 at the other end of the film stopper 23
c pushes the film stop connecting plate 25 upward (clockwise) in FIG. As a result, the left end of the connecting plate 25 comes off the index cam 11b, so the spring 2
It moves to the left by the force of 6 (see Figures 4 and 5).

When the gear 1a is released and the shutter charge cam 2 becomes free, both the motor casing 1h and the output shaft 1g become rotatable.
The one with the smaller load will rotate.

Since the film 40 is wound around the casing 1h and acts as a load, the shutter charge cam 2 rotates in the direction of the arrow shown in FIG. 11 (counterclockwise), and the roller 2a moves to the position shown in FIG. It is locked against 20a of the overrunning clutch lever 20.

As a result, the load on the output shaft becomes greater than the load on the casing 1h, and the casing 1h starts rotating.

At this time, the one-frame indexing mechanism maintains the positional relationship shown in FIG. 3. When the film 40 is wound up by the rotation of the casing 1h, the sprocket 11a is guided by the film, and the indexing cam 11b, which is integral with the sprocket 11a, rotates in the direction indicated by the arrow in FIG. And as shown in Figure 4, 11
b hits 25a of the film stop connecting plate 25,
Slide 25a in the direction indicated by the arrow. As a result, the other end 25b of the film winding contact plate 25 comes into contact with the 24b portion of the film winding claw hook 24, and the hook 24 is rotated clockwise as shown by the arrow, so that the jaw part 24a is moved to the film winding claw hook 24. Pull it away from 23b of 23.

As a result, the film stopper claw 23 moves counterclockwise (FIG. 4), and the claw 23a at the tip jumps into the gear 1a of the casing to prevent rotation of the casing 1h.

When the rotation of the casing 1h is stopped, the output shaft 1g starts rotating, and the shutter charge cam 2 rotates from the state shown in FIG. 7 while pushing the overrunning clutch lever 20 counterclockwise ( Figure 9). At this time, the overrunning clutch lever 20 closes the motor stop switch 30. The signal generated by closing this switch 30 cuts off the power supply to the motor 1.

Even if the power supply to the motor 1 is cut off, the motor 1 does not stop instantaneously, but the shutter charge cam 2 rotates to the position shown in FIG. 8 and comes to rest. Of course, there is no problem even if the vehicle stops at the position shown in FIG.

(Automatic stop mode when all films are wound) As described above, the film feed is stopped at the end of one frame feed by the claw 23a of the film stopper claw 23 meshing with the gear 1a integrated with the casing 1h. .

However, when all the films in the cartridge have been pulled out and there is no more film to be sent out, the automatic stop is carried out in a different manner.

Even if the casing 1h tries to rotate, if there is no film to be pulled out, the casing cannot rotate. In other words, it becomes impossible to move around under an extremely large load. Therefore, output shaft 1
g rotates, pushes up the overrunning clutch lever 20, turns on the motor stop switch 30, and moves to the next mode. At the end of normal one-frame forwarding, the switch 31 is set to 23 as shown in FIG.
d closes, and then the switch 30 closes to cut off the power supply to the motor 1. In this mode, the switch 3 is closed with the switch 31 open.
0 closes.

(Automatic rewind mode) After the film runs out and the film is automatically stopped, rewinding is performed by applying a current opposite to that during normal operation to the motor 1 to reverse the film.

FIG. 6 shows the positional relationship of the one-frame indexing casing locking mechanism during automatic rewinding.

When there is no more film to pull out from the cartridge and the shutter automatically stops, the shutter charge cam 2 is in the state shown in FIG. 8.

When the motor 1 is rotated in the opposite direction, the shutter charge cam 2 attempts to rotate in the counterclockwise direction opposite to the arrow in FIG. Since the rotation is stopped, the casing 1h starts rotating counterclockwise in FIG. 1. This rotation is transmitted to the planetary gear 10 via transmission gear trains 3-9. FIG. 12 shows the operation of the rewinding gear train during rewinding.

The rotation of the planetary gears is carried out by rewinding gear trains 12, 13, 1.
4 and 15, and rotates the rewind claw 15a, which is provided integrally with the gear 15, clockwise in FIG. The rewind claw 15a rotates the core of the cartridge and rewinds the film into the cartridge.

The casing 1h is rotating in the direction of rewinding the film, which is opposite to the arrow shown in FIG. At this time, the film winding claw 1b does not touch the perforation of the film.

(Automatic stop of rewinding) The rotation of the rewinding claw 15a causes the film 40 to move to the first position.
It is returned in the direction indicated by the arrow in Figure 6.

When the film 40 no longer exists on the casing 1h due to this rewinding, the rewinding stop lever 16 falls into the rewinding stop claw 1c to prevent the counterclockwise rotation of the casing 1h (FIG. 17).

By blocking the rotation of the casing 1h, the output shaft 1g rotates and pushes the overrunning clutch lever 20 from the state shown in FIG. 8 to the state shown in FIG. 9, closing the switch 30 and cutting off the motor current. Finish rewinding.

As explained in detail above, according to the present invention,
The output shaft of the geared motor allows the shutter to be set and the casing to wind the film.

Furthermore, since the mechanism is extremely simple, the camera can be made even more compact.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a motor drive mechanism according to the present invention. FIG. 2 is a plan view (view from above the camera) showing the mechanism on the bottom of the camera. FIG. 3 is a plan view mainly showing the one-frame indexing and locking mechanism. FIG. 4 is a plan view showing the frame indexing mechanism in a state where film feeding is stopped. Fifth
The figure is a plan view showing the frame indexing mechanism in a state where the film feed stop state is released. FIG. 6 is a plan view showing the one-frame indexing and locking mechanism in the film rewinding state. FIG. 7 is a plan view showing the automatic loading state, with the transmission gear train omitted. FIG. 8 is a plan view mainly showing the shutter charge mechanism, and is shown in a state in which film winding is completed or in a state at the end of release and before the start of shutter charge. FIG. 9 is a bottom view (view from below the camera) showing a state in which an automatic stop signal is generated. FIG. 10 is a bottom view showing the shutter charging state. FIG. 11 is a bottom view showing the film feed stopper being released. FIG. 12 is a bottom view showing the rewinding state. FIG. 13 is a bottom view showing the sprocket released state during winding. FIG. 14 is a front view showing the installed state of the geared motor,
It is partially cut away to show the internal structure.
FIG. 15 is a sectional view showing the planetary gear in detail. FIG. 16 is a plan sectional view showing the unwinding state. FIG. 17 is a plan sectional view showing a state in which the automatic rewinding stop mechanism is in operation. 1...Geared motor, 1a...Gear (for locking the casing), 1b...Film winding claw, 1c...
...Rewinding stop claw, 1d...Power receiving ring, 1e...Motor body, 1f...Reduction gear train, 1g...Geared motor output shaft, 1h...Casing, 1k...Casing protrusion, 2...Shutter gear Zicam, 2a
...Roller for overrunning clutch, 2b...
Casing stopper release pin, 3, 4, 5, 6,
7, 8, 9...Gear of transmission gear train, 10...Planetary gear, 11...Sprocket shaft gear, 11a...
Sprocket, 11b... Index cam, 12,1
3, 14, 15...Gears of the rewinding gear train, 15a...
...Rewinding claw, 16...Rewinding stop lever, 17... Spring, 18... Planetary gear spring, 19a, 19b...
... Planetary gear movement limit pin, 20 ... Overrunning clutch lever, 21 ... Shutter charge lever, 22 ... Film unwinding release lever,
23...Film winding stop hook, 24...Film winding stop hook, 25...Film winding stop connecting plate, 26...
...Film winding stop contact leaf spring, 27...Film winding stopper spring, 29...Overrunning clutch load spring, 30...Motor stop switch, 3
1...Film one frame winding completion detection switch, 32
...Power supply contact piece, 40...Film, 41...
Aperture, 42...Film Patrone, 4
3,44,45...Main plate, 46...Bearing, 47,
48... Ball bearing, 50, 51, 52,
53, 54...Pin.

Claims (1)

[Claims] 1. A geared motor whose rotation with respect to the casing of the motor is connected to the output shaft via a reduction mechanism provided in the casing, and a cylindrical casing of the motor which also serves as a film winding tube, is connected to the camera body. A casing support structure rotatably supports the film in a film winding chamber, a shutter charge mechanism connected to the output shaft of the geared motor and sets the shutter by rotation of the output shaft relative to the camera body, and a shutter charge mechanism that detects the amount of film feed. a casing locking mechanism that prevents rotation of the casing when a certain amount is reached; a release mechanism that unlocks the casing locking mechanism in conjunction with the shutter charge of the shutter charge mechanism; and a release mechanism provided on the casing of the motor. A motor drive device comprising a current supply unit that supplies current in conjunction with shutter release through a power receiving unit and interrupts the current in conjunction with shutter charging and film winding completion.