JPS6355689B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic rewind device in a camera.

In the case of a camera that uses film (JIS-135 film) stored in a cartridge, the film is wound onto the take-up shaft as shooting progresses, and after the entire amount of film in the cartridge has been photographed, the film is wound back into the cartridge. I need to bring it back.

The above rewinding is usually done manually, but
2. Description of the Related Art Among cameras in which a motor is built into or attached to the camera and the film is wound up by the power, there are some cameras in which the film can also be automatically rewound by the motor.

As the automatic rewind device, for example,
As seen in Japanese Patent No. 50-97326 and Japanese Utility Model Application No. 53-41936, these conventional automatic rewinding devices both have a plurality of rollers on the circumferential surface of the end of a spool shaft that protrudes from one end of the cartridge. The film is rewound into the cartridge by pressing the film into contact with the spool shaft and rotating the roller by a motor to rotate the spool shaft.

However, in order to rotate the spool shaft by the rotation of the roller that presses against the shaft end of the spool shaft, the roller must be pressed against the circumferential surface of the shaft end of the spool shaft with sufficient frictional force. A radial force is applied between the rotating shafts of the drive roller and other rollers and the bearings that support them, and as a result, a large frictional force is generated in the bearings, causing the rollers to This has the drawbacks of requiring a large driving torque, causing a large loss of rotational energy transmitted from the motor, and increasing power consumption.

In view of this, the present invention was made for the purpose of providing an automatic rewinding device for a camera that can reduce rotational energy loss due to friction, increase power transmission efficiency, and reliably rotate a spool shaft. It is something.

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 shows the appearance of the application area of the device of the present invention,
FIG. 2 shows an example of this internal configuration.

The device of the present invention is provided at a location where the shaft end of a spool shaft 4 protruding from one end of a cartridge 3 housed in a cartridge storage chamber 2 of a camera body 1 is located. A plurality of pieces (three pieces in the embodiment) are located around the shaft end of the spool shaft 4 and can be pressed against the outer periphery of this shaft end and can be separated and separated.
frictional engagement members 5, 5, 5, and a carrier 6 that supports and revolves the frictional engagement members 5, 5, 5.
and an actuating member 7 that presses or separates the frictional engagement members 5, 5, 5 from the outer periphery of the shaft end of the spool shaft 4.
and a drive mechanism that rotates the carrier 6 during rewinding.

In the embodiment shown in FIG. 2, each of the frictional engagement members 5, 5, 5 is a planetary gear-like member that is annularly arranged and supported at equal intervals on the upper surface of the disc-shaped carrier 6. The planetary gears 8, 8, 8 are made up of cylindrical friction pieces that are eccentrically planted on the upper surface of the planetary gears 8, 8, 8. It is meshed with a sun gear 10 as a gear-like member, and at the time of this meshing, the frictional engagement members 5, 5, 5 are meshed with each other in the same positional relationship with respect to the center of the shaft 9.

A rotation stopper member 11 is provided on the carrier 6, and when one friction engagement member 5 hits this rotation stop member 11, each friction engagement member 5, 5, 5 is moved from the axis of the carrier 6. It is configured so that it can be kept at the most distant position.

A drive gear 12 is fixed to the other end of the shaft 9,
This drive gear 12 is adapted to be interlocked with a drive source when rewinding the film F.

On the other hand, the actuating member 7 is provided to the side of the carrier 6 and the drive gear 12, and in this embodiment, the base is rotatably supported on a pivot shaft 14 that pivotally supports the back cover 13 of the camera. A fan-shaped gear 15 formed in a portion corresponding to the arc can mesh with the drive gear 12, and an arc with a smaller diameter An arcuate surface 16 corresponding to this is formed in a stepped shape, and can be press-fitted and engaged with the outer circumferential surface of the carrier 6 by using the arcuate surface as a friction surface 16.

The side surface of the actuating member 7 is brought into contact with a pressing portion 17 projecting from a portion of the back cover 13 by a weak spring (not shown). When the back cover 13 of the camera is closed, the pressing portion 17 is pressed against the operating member 7.
When the back cover 13 is opened, the actuating member 7 is pushed clockwise in FIG. 2.

The back cover 13 includes the frictional engagement members 5, 5,
A guide piece 21 is protruded so that the shaft end of the spool shaft 4 of the cartridge 3 can be placed in the position where the end of the spool shaft 5 can be most easily taken in and out. One frictional engagement member 5 located at the farthest position from the axis comes into contact with it, so that the other frictional engagement members 5, 5 are positioned parallel to the open back surface of the camera body 1, The shaft end of the spool shaft 4 can be taken in and out from.

Further, a carrier 6 is provided on the lower surface of the operating member 7 to facilitate taking in and out the cartridge 3 as described above.
A friction member 18 having the same shape as the operating member 7 is rotatably attached to the pivot shaft 14 of the back cover 13, and a friction material is attached to the arc surface of the friction member 18. Friction surface 19 due to
is formed and disposed so as to be able to press against the outer peripheral surface of the disc 20 on the shaft 9 of the carrier 6.

There is a protrusion 7a on the side of the actuating member 7,
When the friction engagement members 5, 5, 5 are clamped by the member 7, the friction members 18 are moved in the same direction.
It performs the same function as the sector gear 15.

Further, the back cover 13 is provided with a lever 22, which pushes the friction member 18 in the opening direction of the back cover 13 after the back cover 13 is opened and the guide piece 21 is moved to the above-mentioned guide position. , when the back cover 13 is closed, it appears to be evacuated.

Next, the operation of the above embodiment will be explained.

Fully open the back cover 13 of the camera and pass the shaft end of the spool shaft 4 between the two frictional engagement members 5, 5 arranged on the front side on the carrier 6 as shown in the second figure. Store Patrone 3 inside. In this way, the back cover 13 is closed and photography is carried out as usual, and when the film F is wound up, the spool shaft 4 freely rotates to unwind the film F.

After all the frames of the film F have been photographed, when rewinding is started, the drive gear 12 is rotated clockwise by a drive system driven by a motor. At this time, the sector gear 15 of the actuating member 7, which is biased by a weak spring (not shown), moves to the drive gear 12.
At the same time, the friction surface 16 of the actuating member 7 presses against the circumferential surface of the carrier 6 to rotate it. At this time, due to the difference in diameter between the driving gear 12 and the carrier 6, and between the sector gear 15 and the friction surface 16, the angular velocity of the shaft 9 is lower than the diameter of the carrier 6.
As a result, the planetary gears 8, 8, 8 rotate in the same direction as shown in FIGS. 8A to 8B through the sun gear 10, and each friction engagement member 5,
5, 5 are pressed against the outer circumferential surface of the shaft end of the spool shaft 4 as shown in FIG. 8C, and are sufficiently tightened and clamped.

In this way, when one friction engagement member 5 hits the rotation stopper member 11 and further rotation is stopped, the sun gear 10, the planet gears 8, 8, 8, the carrier 6, and the spool shaft 4 stop relative movement. Then, everything is rotated as one by the shaft 9, and the film F starts to be rewound. When this state is reached, the sector gear 15 of the actuating member 7 has passed the drive gear 12 and is disengaged, and the friction surface 16 is also disengaged from the circumferential surface of the carrier 6 and left free. At the same time, the protrusion 7a of the actuating member 7 causes the friction member 18 to
will also be moved together.

After rewinding the scratched film F into the cartridge 3 as described above, when the camera back 13 is opened,
As the operating member 7 rotates so as to be pushed out by the pressing portion 17, the sector gear 15 meshes with the drive gear 12 on the way, and the friction surface 16 comes into pressure contact with the peripheral surface of the carrier 6, reversing them. Rotate clockwise. In this case as well, the planetary gears 8, 8, 8 are rotated in the opposite direction due to the difference in angular velocity between the shaft 9 and the carrier 6, and the frictional engagement members 5, 5, 5 are connected to the shaft end of the spool shaft 4. is separated from the circumferential surface of the planetary gears 8, 8, 8, and by half a rotation of the planetary gears 8, 8, 8, the position becomes the most distant position as shown in FIG. 9A.

When the back cover 13 is further opened, the guide member 21 is projected onto the path of the friction engagement members 5, 5, 5, and the friction member 18 is pushed by the lever 22, as shown in FIG. 9B. Therefore, the disk 20 rotates,
The shaft 9 is rotated to bring one of the frictional engagement members 5, 5, 5 into contact with the guide member 21 and stopped at the position shown in FIG. 9C. This is the other two frictional engagement members 5, 5.
This is to ensure that the shaft ends of the spool shaft 4 are aligned exactly parallel to the open surface of the camera, making it easy to take out the shaft end of the spool shaft 4.

As the back cover 13 approaches its fully open position, the friction member 18 slips and becomes fully opened in the state shown in FIG. 9D, at which time the cartridge 3 is removed and a new cartridge 3 is loaded.

As explained above, the automatic rewinding device according to the present invention does not involve the spool shaft of the cartridge in any way during film winding, so there is no energy loss. The frictional engagement members eccentrically planted on the upper surface of each of the gear-shaped members are simply held in pressure contact with the spool shaft, and the gear-shaped members are meshed with one sun gear-shaped member. are arranged in an annular manner at equal intervals and are pivotally supported, and a carrier carrying these friction engagement members is meshed with a drive gear-shaped member directly connected to the sun gear-shaped member, and an actuating member that engages with the carrier. By rotating the spool and rewinding the film into the cartridge, there is no need to apply a driving force to the frictional engagement member, and this eliminates the need to apply driving force to the frictional engagement member, which is caused by the increase in friction in the bearing part as in the conventional case. Loss of rotational force is prevented and energy can be used effectively. Further, since the frictional engagement members are separated from each other when inserting and removing the cartridge, various effects such as easy insertion and removal operations can be obtained.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a part of the camera to which the present invention is applied, FIG. 2 is a perspective view showing the internal structure of the camera, and FIG.
4 is a perspective view of the actuating member in FIG. 2, FIG. 5 is a plan view showing the relationship between the actuating member and the friction member, FIG. 6 is a front view of the same, and FIG. 7A is a sectional view of the same. ，
B is an explanatory diagram showing the operating status of the operating member, FIG. 8A
-D are explanatory diagrams showing the operational status of the frictional engagement member, and FIGS. 9A to 9D are explanatory diagrams showing the operational status of positioning of the frictional engagement member. 1...Camera body, 2...Patrone storage chamber, 3...Patrone, 4...Spool shaft, 5...
... Frictional engagement member, 6 ... Supporting body, 7 ... Operating member, 8 ... Planetary gear, 9 ... Shaft, 10 ... Sun gear, 11 ... Rotation stop member, 12 ... Drive gear,
13...Back cover, 15...Sector gear, 16...Friction surface, 17...Press portion, 18...Friction member, 19...
...Friction surface, 20...Disc, 21...Guide member,
22...Lever, F...Film.

Claims (1)

[Claims] 1. At least three gear-like members positioned around the shaft end of a spool shaft protruding from one end of the cartridge stored in the cartridge storage chamber of the camera body, and movable in the direction of pressing and separating from the outer peripheral surface of this shaft end. a frictional engagement member eccentrically planted on the upper surface of each;
one sun gear-shaped member that meshes with each of the gear-shaped members; and a carrier for supporting the frictional engagement member by pivotally supporting the gear-shaped members in an annular arrangement arranged at equal intervals and causing the frictional engagement member to revolve. and an actuating member that meshes with the driving gear-like member directly connected to the sun gear-like member and engages with the carrier to press the frictional engagement members against or separate from the outer peripheral surface of the shaft end of the spool shaft. An automatic rewinding device for a camera, comprising: a drive mechanism for rotationally driving the carrier when rewinding the film.