JPH07122728B2 - Film automatic rewinding camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an automatic film winding / rewinding camera, and more specifically, an automatic film winding / rewinding system in which a planetary gear mechanism is used to switch between film winding and rewinding. Regarding the return camera.

[Prior Art] In a camera in which a planetary gear mechanism is used to switch the film winding / rewinding operation by reversing the rotation direction of the motor, for example, the voltage of the power supply battery during film rewinding operation If the battery has been replaced by a new battery when the motor has stopped due to a decrease in battery power, it is necessary to continue the film rewinding operation.

For this reason, a state switch is provided to keep track of whether the film is winding or rewinding, and as described above, the film rewinding operation is interrupted when the battery voltage drops. However, when the battery is replaced with a new one, an appropriate control circuit can read the state of the state switch and continue the previous operation (that is, film rewinding).

Various types of such state switches have been proposed. For example, in the proposal disclosed in Japanese Patent Laid-Open No. 56-47026, switching between film winding and rewinding is performed manually. Then, in the film winding mechanism using the planetary gear train for the above winding / rewinding switching, a torque detecting lever is used as a means for detecting the torque at the winding end of the film, and the state switch is switched by the movement of this lever. There is. However, with this means, it is necessary to increase the friction of the planetary gear train in order to detect the torque and allow the planetary gear to rotate the torque detection lever to get over it. Because of this, the space has become large. Further, the film winding and rewinding are not automatically switched.

Further, the means disclosed in JP-A-59-95520,
Depending on the rotation position when hoisting and rewinding the planetary gear,
The status switch is opened and closed by pushing the status switch with the movement of the planetary lever. However, with this means, the rotational friction of the planetary gear train must be made sufficient to press the switch contact piece, which increases the load during hoisting and rewinding. Also, winding up
If vibration or impact is applied to the camera body in each rewinding state, the planetary gear lever may move in the opposite direction, and the state switch is unstable and uncertain.

Further, the means disclosed in JP-A-59-140430,
There is a spiral cam on the rotating member whose direction of rotation is reversed by hoisting / rewinding operation, and this cam actuates the lever to detect the state of the status switch by the difference in each position of hoisting / rewinding. There is. However, in this method, since the lever is linked by the spiral cam,
It requires a space only for the range of movement, and if the spiral cam rotates due to vibration or impact, the status switch becomes unstable. To prevent this, a rotation locking member is required, so the mechanism is It becomes complicated and the space becomes large.

Further, the means disclosed in Japanese Patent Publication No. Sho 43-7573 proposed by the applicant is a pawl that transmits rotation in only one direction on any shaft of a gear that transmits rotation from the film winding spool to the sprocket. When the clutch is provided and the end of winding is reached, one of the claw clutches swings in the axial direction against a spring provided appropriately, and in conjunction with this swinging, the switch of the power supply circuit to the drive motor can be switched. It is equipped with a hoisting / rewinding state changeover switch. However, with this means, some other means must be taken in order to automatically perform switching in the winding direction after the state switch is turned on, which complicates the mechanism and further increases the space.

[Problems to be Solved by the Invention] By the way, as described above, in the conventional state switch for storing the film winding / rewinding state, the memory state becomes unstable when vibration or impact is applied to the camera body, There is a problem in that it is uncertain, that the load for switching the detection of the winding or rewinding state is large, and that the space is large and the mechanism is complicated.

[Means and Actions for Solving Problems] In order to solve the above problems, the present invention is configured such that either one of a rewinding system gear train or a hoisting system gear train is meshed with a planetary gear. At approximately the same time, a fan-shaped gear that meshes with the planetary gear and is arranged to be rotated by the planetary gear, and an urging means that always returns the fan-shaped gear in the same direction, And a switch member for detecting a film winding / rewinding state which is opened / closed by the rotation of the fan-shaped gear, and the switch member keeps on or off depending on the film rewinding state or the winding state. It is characterized by doing so.

[Embodiment] The present invention will be described below based on an embodiment shown in the drawings. FIG. 1 is an exploded perspective view of an automatic film winding and rewinding camera showing an embodiment of the present invention. As shown in the figure, on the lower surface of a plate-shaped sprocket wheel 1 having eight sprockets, a peripheral cam having a little thickness is integrally formed with the wheel 1.
1A is formed, and a disc 1B is attached to the lower surface side of the peripheral cam 1A. As shown in FIG. 2 (A), the cross-sectional shape of the operating cam surface of the circumferential cam 1A is substantially circular, and a rivet-shaped recess 1a is formed in a part of the operating cam surface. . The bottom 1d of the recess 1a is substantially perpendicular to the radius passing through the center of the bottom 1d, and comparing one slope 1e with the other slope 1g, the slope 1e is slightly longer,
The tip of the slope 1e is connected to one end of the second slope 1f. The other end of the second slope 1f has the above-mentioned peripheral surface cam 1A.
2A, the radius gradually decreases in the counterclockwise direction in FIG. 2A, and eventually to one end of the other slope 1g. Then, the recess 1a
The lock portion 2a of the lock plate 2 described below is engaged with the.

As shown in FIG. 1, on the lower surface side of the disc 1B, a circular printed board 31 having substantially the same size as the disc 1B is mounted coaxially with the disc 1B. A fan-shaped conductor pattern 31a is formed on the lower surface of 31. Below the printed circuit board 31 and at a position facing the conductor pattern 31a, two contact pieces 3 made of a leaf spring are provided.
2,33 are provided. One end of each of the contact pieces 32, 33 is in sliding contact with the conductor pattern 31a at the same time, and the other end is connected to a control circuit section (not shown) and is fixed to the camera body. That is, due to the rotation of the sprocket wheel 1, the contact pieces 32 and 33 are turned on via the conductor pattern 31a at one time, and at the other time, the contact pieces 32 and 33 come into contact with the non-conductive portion.
The contact pieces 32 and 33 are configured to be turned off.

As shown in FIG. 1, the lock plate 2 is arranged below the sprocket wheel 1. As shown in FIG. 2 (A), the lock plate 2 is an elongated plate, and its center is attached to a support shaft 2d fixed to the camera body so as to rotate. The tip of one arm of the lock plate 2 extends to the left in a trapezoidal shape and
2a is formed, and the lock portion 2a is adapted to engage with the concave portion 1a of the peripheral surface cam 1A.

The left edge of the lock plate 2 slightly above the center (in FIG. 2A) is bent downward (as viewed in FIG. 1) in a tongue shape to form a bent portion 2b. Is arranged so as to engage with the protrusion 7a when the protrusion 7a provided on the upper surface of the internal gear 7 described below rotates.

A small roller 3 is rotatably attached to the lower surface of the other arm of the lock plate 2 on a shaft planted in the lock plate 2, and the roller 3 is shown in FIG. 2 (D). As described above, when the protrusion 7a provided on the internal gear 7 is rotated, the protrusion 7a is engaged with the protrusion 7a.

As described above, the lock plate 2 is attached so as to rotate about the support shaft 2d, and the return portion of the torsion spring 4 is wound around the support shaft 2d. One end of the torsion spring 4 has a pin 4a fixed to the camera body.
And the other end is locked at the central portion of the lock plate 2 slightly below the left side surface. That is, the lock plate 2
Is urged to rotate counterclockwise by a torsion spring 4.

As shown in FIG. 1, a large-diameter internal gear 7 is arranged below the lock plate 2 with its tooth surface facing downward. A bearing is press-fitted in the center of the internal gear 7, and a shaft portion 9a of the gear 9 described below fits into the bearing. An arcuate protrusion 7a is formed near the outer periphery of the upper surface of the internal gear 7.

A slender cylindrical drive motor 5 is disposed on the upper left side of the internal gear 7 with its output shaft facing downward, and a pinion 6 is fixed to this output shaft. A gear 8 is disposed to the right of the pinion 6, and the gear 9 having a small diameter is disposed integrally and coaxially with the gear 8. The shaft portion 9a is provided between the gears 8 and 9. Are formed.

A disc 11 slightly smaller than the inner diameter of the internal gear 7 is disposed below the gear 9 coaxially with the gear 9. Three spindles 11Aa, 11Ab, 11Ac are planted on the upper surface of the disk 11 near the outer periphery thereof so as to be arranged at the vertices of an equilateral triangle, and these spindles 11Aa, 11Ab, 11Ac are Is equipped with small-diameter planetary gears 10a, 10b, and 10c having the same diameter so as to be rotatable. The gears 10a, 10b, 10c mesh with the gear 9 and mesh with the internal gear 7.
On the lower surface of the center of the disk 11, the gear 11 is coaxial with the disk 11.
a is fixed, and the shaft 11b is
Are formed. The gears 8, 9 and 11a are arranged coaxially with each other. That is, the internal gear 7, the gear 9, and the planetary gears 10a, 10b, 10c constitute a planetary gear mechanism, the gear 9 corresponds to a sun gear, and the gears 10a to 10c correspond to planetary gears. .

The gear 11a is fitted into a hole 12a provided in the planetary arm 12 (see FIG. 3 (A)) and meshes with a large-diameter gear 13a of a two-stage gear 13 described next. The planetary arm 12 is in the form of a short elliptic cylinder having a fan-shaped cross section, and has a thick base end and a thin tip end (see FIG. 3 (A)). Then, the hole 12 is formed at the base end.
a is formed, and a groove is formed laterally on the tip end side. Small holes 12b and 12c are formed in the upper arm and the lower arm of the tip, respectively.
And the lateral groove and the hole 12a are penetrated inside the planetary arm 12. The two-stage gear 13 is composed of a large-diameter gear 13a and a small-diameter gear 13b, and a shaft penetrating the central portion thereof is fitted in the small holes 12b, 12c. That is, the gear 11a and the large-diameter gear 13a of the two-step gear 13 mesh with each other inside the planetary arm 12 which is penetrated. With this structure, the planetary arm 12 is rotated in the direction indicated by the arrow F (counterclockwise) or the arrow G (clockwise) by the forward and reverse rotation of the drive motor 5,
Small diameter planetary gear 13b is switched and hoisting gear train 7
0 or the rewinding system gear train 80 is engaged with each other.

The structure of the hoisting system gear train 70 is firstly the idle gear 14
And the large-diameter gear 15 mesh with each other. The gear 15 and the small-diameter gear 16 are coaxially fixed to each other to form a two-stage gear, which is fitted into a shaft 35 fixed to the camera body. The shaft 35 has an elliptical arm 20. It is also fitted at the base end of the. That is, the arm 20 is rotatable about the shaft 35 in the direction of arrow D or E.

A shaft 20a is planted on the central upper surface of the arm 20.
A two-stage gear in which a large-diameter gear 17 and a small-diameter gear 18 are integrated is rotatably fitted on the shaft 20a. A shaft 20b is planted at the tip of the arm 20.
A gear 19 having a spool engaging portion 19a fixed to the upper surface thereof is rotatably fitted in 0b. The small-diameter gear 16 and the large-diameter gear 17 mesh with each other, and the small-diameter gear 18 and the gear 19 mesh with each other.

The engaging portion 19a is adapted to engage with an engaging portion (not shown) formed at the lower end of the spool 21 arranged above.

The spool 21 has an elongated cylindrical shape, and an engaging pin 21b extends upward from the center of the tip. This spool 2
A spool claw 21a is formed at an appropriate position on the outer peripheral surface of the upper end portion of 1, and the spool claw 21a is adapted to engage with the perforation 29a of the film 29. The engaging pin 21b is fitted in the arc-shaped guide groove 23a formed in the camera body 23. That is, even when the film 29 is wound up on the spool 21 and the spool 21 is getting thicker, the rotation of the arm 20 of the hoisting system gear train 70 about the shaft 35 (rotation of radius R). Motion)
And the sliding of the engagement pin 21b along the guide groove 23a, the film can be smoothly wound around the axis of the spool 21.

The sprocket wheel 1 is arranged on the left side of the spool 21, and is arranged so that the lower perforation 29a of the film 29 and the sprocket are engaged with each other. The portion of the sprocket wheel 1 on the film 29 on the right slope corresponds to the screen 30.

The Patrone 28 is on the left of the sprocket wheel 1 above.
Is arranged with the film entrance 28a facing to the right,
The film 29 is pulled out from here and wound up on the spool 21.

When the planetary arm 12 rotates in the direction of arrow G, the gear of the rewinding system gear train 80 and the small diameter gear 13b of the two-stage gear 13 come into mesh with each other. That is, the small diameter gear 13b and the large diameter gear 24 are arranged so as to mesh with each other. A small-diameter gear 25 is formed integrally with the gear 24 to form a two-stage gear, and the gear 25 meshes with a large-diameter gear 26. A fork mounting cylinder 26a is fixed to the upper surface of the gear 26, and an engagement groove having an oval cross section is formed in the cylinder 26a. A fork 27 having an oval cross-section is fitted into the engaging groove via a compression spring 34, and the forcing force of the spring 34 causes an engaging hole (not shown) of the cartridge 28 to be inserted. The fork 27 is inserted.

As shown in FIGS. 1 and 3 (A), a fan-shaped gear 36 is arranged in front of the large diameter gear 24 of the rewinding system gear train 80. In this fan-shaped gear 36, a fan-shaped gear portion 36a is formed over about 1/3 of the circumference of the disc, and a projection 36c is formed on the upper surface of the disc and in front of the right end tooth of the fan-shaped gear portion 36a. Has been formed. A protrusion 36b is formed on the front side of the left end tooth of the fan-shaped gear portion 36a formed on the disc, and on the side surface of the disc, the protrusion 36b includes two contact pieces 39a, 39b. The state switch 39 for storing the winding state or the rewinding state is formed so as to engage with the tip of the contact piece 39a (longer contact piece). A slightly thick shaft 36d is fitted and fixed to the disc, and a coil spring 37 is inserted on the upper side of the shaft 36d. One end 37b of the coil spring 37 is locked to the protrusion 36c on the disc,
The other end 37a is fixed to the camera body. With this structure, the fan-shaped gear 36 is urged to rotate in the counterclockwise direction (indicated by the arrow K direction), and the protrusions on the disc are projected.
36c is stopped by a rod-shaped stopper 40 fixed to the camera body.

Next, the operation of the automatic film winding and rewinding device configured as described above will be described.

FIG. 1 shows a state in which the film 29 is loaded in the camera body and is waiting for film winding. From this state, preparation for photographing (usually, three frames of film idling) is performed, the film 29 is wound on the spool 21, and the shutter release is awaited.

Now, in the above-mentioned state, as shown in FIG. 2 (A), the sprocket of the sprocket wheel 1 is fitted into the perforation 29a of the film 29, and the lock portion 2 of the lock plate 2 is engaged.
The a engages with the concave portion 1a formed in the peripheral cam 1A and waits for shutter release. After the shutter release is performed and the film is exposed, the film is wound up. In order to wind the film, the drive motor 5 rotates in the clockwise direction (indicated by the arrow A) in FIG. 1 and the gears 8 and 9 are rotated counterclockwise. Rotate in the direction. Then, the three planetary gears 10a, 10b, 10c meshing with the gear 9 are rotated and revolved, so that the disc 11 is rotated clockwise. Therefore, the internal gear 7 meshing with the gears 10a to 10c also rotates in the clockwise direction (the direction indicated by the arrow B), so that the protrusion 7a formed on the upper surface of the gear 7 also moves in the arrow B direction. It rotates (see FIG. 2 (A)). Eventually, as the rotation of the internal gear 7 in the direction of arrow B progresses, the protrusion 7a is locked by the lock plate 2a.
When the internal gear 7 collides with the bent portion 2b, the clockwise rotation of the internal gear 7 is blocked by the reaction force of the torsion spring 4. Since the rotation of the planetary gears 10a to 10c is stopped by this blocking, all the rotational force of the motor 5 is transmitted to the disk 11, that is, the gear 11a fixed to the disk 11, and the gear 11a is rotated counterclockwise. Rotate in the direction. Therefore, two-stage gear 1
While 3 rotates clockwise, the planetary arm 12 is rotated counterclockwise (indicated by arrow F in FIG. 1), and the small-diameter gear 13b of the two-stage gear 13 is idle in the hoisting system gear train 70. It meshes with gear 14.

Due to this meshing, the rotation of the planetary gear 13b of the small diameter is sequentially made to become an idle gear 14, a large-diameter gear 15, a small-diameter gear 16 integrated with the gear 15, a large-diameter gear 17, and the gear 17. Small diameter gear 18, gear
It is transmitted to 19 and tries to rotate this gear 19 clockwise. That is, the spool 21 is also clockwise (indicated by arrow C)
When the film 29 is rotated by, the perforation 29a of the film 29 meshes with the sprocket of the sprocket wheel 1 so that the film 1 is driven.

At the beginning of this driven operation, as shown in FIG. 2 (A), the lower surface of the lock portion 2a of the lock plate 2 (FIG. 2 (A)).
2) is in contact with the inclined surface 1g of the concave portion 1a of the peripheral cam 1A, but when the spool 21 further tries to wind up the film 29, the sprocket wheel 1 makes a slight clockwise rotation, and FIG. As shown in (), the sloped surface 1e of the recess 1a and the upper side surface of the lock portion 2a abut. In this state, the sprocket wheel 1 can be completely stopped from rotating,
The disk 11 cannot rotate. Therefore, since the force is concentrated on the protrusion 7a of the internal gear 7, the protrusion 7a pushes the bent portion 2b of the lock plate 2 in the clockwise direction. Then, when the upper corner of the lock portion 2a crosses the slope 1e, the sprocket wheel 1 slightly rotates, and as shown in FIG. 2 (C), the upper corner contacts the slope 1f and the lock 2a, and The protrusion 7a pushes the bent portion 2b and rotates clockwise.
Then, as shown in FIG. 2 (D), since the protrusion 7a contacts the roller 3, the rotation of the internal gear 7 stops, and the driving force of the motor 5 is transmitted to the hoisting system gear train 70. The film 29 starts to be wound on the spool 21, and the film 29 advances in the direction of arrow H as shown in FIG.

As the film 29 advances in the H direction, the sprocket wheel 1 follows the film 29, and the substrate 31 integrated with the wheel 1 also rotates in the clockwise direction due to this film 29, so that the film initially contacts the conduction pattern 31a. Then, the contact pieces 32 and 33 which have been turned on are eventually cut off from this on state and turned off.

In this way, the film 29 is wound up, and when the sprocket wheel 1 is rotated by eight sprocket wheels, the lock portion 2a of the lock plate 2 is again recessed in the peripheral cam.
It falls to 1a (that is, the state of FIG. 2A). At the same time, since the conductive pattern 31a turns on the contact pieces 32 and 33, a control circuit unit (not shown) detects this ON state and outputs a signal to brake the motor 5 to wind one frame of film. Complete. That is, as shown in FIG. 2 (A) again, the sprocket wheel 1 is locked by the lock plate 2, and as a result, the film shift is caused by the loose fit between the concave portion 1a of the peripheral cam and the lock portion 2a of the lock plate. Only minutes. By repeating the above, the film is sequentially wound up.

On the other hand, in the case of rewinding the film, since the reverse rotation current of the drive motor 5 is supplied from the control circuit section, the motor 5 rotates in the reverse direction (counterclockwise rotation in FIG. 1). Then, the pinion 6 and the gear 8 fixed to the output shaft
9, and the two-stage gear 13 rotates counterclockwise via the gear 11a to rotate the planetary arm 12 in the direction of arrow G (clockwise) shown in FIG. Then, the small-diameter gear 13b separates from the idle gear 14 and meshes with the gear 24. Therefore,
Fork 27 through rewinding gear train 80 of gears 24, 25, 26
Is rotated counterclockwise, the film 29 is rewound on the cartridge 28. Along with this rewinding, the sprocket wheel 1 rotates in the direction opposite to that at the time of winding (that is, counterclockwise in FIG. 1).
However, before the small-diameter planetary gear 13b meshes with the gear 24, the projection 7a of the internal gear 7 rotates in the direction of arrow I shown in FIG. 2 (A), and the lock plate 2 shows in FIG. 2 (D). In the state shown in Fig. 6, the roller 3 abuts on the position indicated by reference numeral 3a, so that the rotation of the internal gear 7 stops and the rotational force of the drive motor 5 is the pinion 6, the gears 8 and 9 and 11 as described above.
a, It is transmitted to the gear 24 through the two-stage gear 13 and enters the film rewinding.

As described above, when the sprocket wheel 1 is driven in the rewinding direction, the lock portion 2a of the lock plate 2 contacts the operating cam surface of the peripheral cam 1A, as shown in FIG. 2 (D). The wheel 1 rotates while being in contact. Eventually, the lock portion 2a of the lock plate 2 again falls into the concave portion 1a of the peripheral cam 1A, but the inclined surface 1g of the peripheral cam 1A pushes out the lock portion 2a, so that the lock plate 2 is rotated clockwise. It is moved and retracts from the recess 1a. Therefore, the sprocket wheel 1
The rotation of is not hindered. The above operation is repeated when the film is rewound.

Next, the operation of the hoisting / rewinding state switch and the fan-shaped gear will be described with reference to FIGS. 3 (A), (B) and FIG. 4 (A).
A description will be given based on (D).

First, when the film is wound up, as shown in FIGS. 3 (A) and 4 (A), the planet gears 13 of large diameter and small diameter are provided.
a and 13b rotate in the direction of arrow L, and the planet gear 13b with the above small diameter.
Meshes with the gear 14, and the rotational force of the motor is transmitted to the hoisting system gear train 70 (see FIG. 1).

On the other hand, at the time of the above, the fan gear 36 is biased in the direction of arrow K (counterclockwise) by the coil spring 37, and the projection 36c formed on the fan gear 36 is fixed to the camera body. 40 has been stopped. The projection 36b formed on the side surface of the fan-shaped gear 36 is
As shown in FIGS. 3 (A) and 4 (A), the tip of the longer contact piece 39a of the state switch 39 for identifying the winding / unwinding state is pushed in the clockwise direction. Since the contact with the piece 39b is cut off, the state switch 39 is in the off state. That is, as described above, the coil spring 37
As a result, the protrusion 36b is continuously pushed in the direction of the arrow K, so that the state switch 39 can be kept in the off state even if there is vibration or impact, and is stable.

Next, when the film is rewound, as shown in FIG. 3 (B), the drive motor 5 rotates in the reverse direction (that is, in the direction opposite to the arrow A direction shown in FIG. 1), and this reverse rotation causes the pinion 6 ,
The planetary arm 12 is sequentially transmitted to the gear 9 and the gear 11a to rotate in the direction of arrow G (see FIG. 4 (B)). Then,
The large diameter and small diameter planetary gears 13a and 13b rotate in the direction of arrow M (counterclockwise direction) while the small diameter planetary gear 13b meshes with the large diameter gear 24, as shown in FIG. 4 (C). As described above, the large-diameter planetary gear 13a meshes with the fan-shaped gear portion 36a of the fan-shaped gear 36, and rotates the fan-shaped gear 36 in the arrow J direction (clockwise direction) against the biasing force of the coil spring 37. As the rotation further progresses, as shown in FIG. 4 (D), the end of the fan-shaped gear portion 36a has a large diameter planetary gear 1
The rotation of the small-diameter planetary gear 13b meshing with 3a is transmitted to the rewinding system gear train 80. In the rewound state, the fan-shaped gear portion 36a is held at the position shown in FIG. 4 (D) by the large diameter planetary gear 13a and the coil spring 37. Then, in this state, the protrusion 36b of the fan-shaped gear 36
Is separated from the contact piece 39a as shown in FIG. 4 (D), the contact pieces 39a and 39b come into contact with each other to be turned on.

Since this is done, even if the drive motor 5 stops for some reason during the rewinding of the film,
The position of the fan gear 36 described above is maintained as it is.

That is, as shown in FIG. 4 (D), since the fan-shaped gear portion 36a is rotationally biased in the arrow K direction (counterclockwise direction) by the coil spring 37, the large-diameter planetary gear 13a is in the arrow X direction ( Clockwise). Therefore, the small-diameter planetary gear 13b is in mesh with the large-diameter gear 24, so that the gear 24 does not rotate even if the drive motor stops as described above. That is, when the camera body is vibrated or impacted, or by the force due to the slack of the film in the cartridge, the cartridge shaft rotates in the rewinding direction, and the rotational force is transmitted to the gear 25 via the gear, and Planetary arm 12
The state shown in FIG. 4 (D) is maintained even when the arrow is turned in the direction of arrow F (see FIG. 3 (B)).

Therefore, the on or off state of the state switch 39 is
Even if a shock or the like is applied, each state can be maintained as it is.

[Effects of the Invention] According to the present invention, the movement of the planetary gear and the fan-shaped gear causes the movement of the fan-shaped gear to actuate the state switch for identifying the film winding / rewinding state. The load on film rewinding or winding is small, the switching between winding and rewinding is smooth, the power consumption of the drive motor is small, and the mechanism is simple.

Further, since the fan-shaped gear uses the biasing means so as to always act in the direction in which it meshes with the planetary gear, for example, vibration or shock is applied to the camera body while the drive motor is stopped, or rewinding ( Even if a force is applied from the (winding) shaft, the state of the state change switch and the planetary gear are maintained as they are, and the reliability of the state maintenance can be improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an automatic film winding / rewinding camera according to an embodiment of the present invention, and FIGS. 2 (A) to 2 (D) are schematic views of the automatic film winding / rewinding camera shown in FIG. 3 (A) and 3 (B) are enlarged plan views showing the operation of the section, and FIG. 3 (A) and FIG. 3 (B) are enlarged perspective views showing the operation of the main part of the automatic film winding / rewinding camera shown in FIG. 3D to 3D are plan views showing the transition of the operation of the main parts shown in FIGS. 3A and 3B. 5 …… Drive motor 13 …… Planetary gear 36 …… Fan-shaped gear 37 …… Coil spring (biasing means) 39 …… Winding / rewinding state switch (switch member) 70 …… Hoisting gear train 80 …… Winding Return gear train

Claims (1)

[Claims] Claim: What is claimed is: 1. An automatic film winding and rewinding camera, wherein a planetary gear mechanism is switched by reversing the direction of rotation of a drive motor to automatically switch film winding and rewinding. The gear train is arranged so as to be meshed with the planetary gear at substantially the same time that either one of the train train or the hoisting system gear train meshes with the planetary gear, and is rotated in one direction by the planetary gear. A fan-shaped gear, an urging means for constantly rotating and returning the fan-shaped gear in the other direction, and a switch member for opening / closing by rotating the fan-shaped gear and detecting a film winding / rewinding state. An automatic film winding / rewinding camera, which is equipped with