JPS6035056Y2 - Camera film rewind switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a film rewind switching device for a camera.

Generally, when rewinding a film, a rewinding device is well known in which a rewind button is pressed to release a sprocket and the rewind button is locked and held in that position.

In such a rewinding device, there is also a known device that automatically releases the lock of the rewinding button after the rewinding is completed to enable the next film to be wound. In many cases, the locking member is released in conjunction with the hoisting operation.

Therefore, when the film reaches the final end during winding, the release member provided in the winding drive train may stop at the position where the locking member is released, making it impossible to lock the rewind button. often occurred.

The present invention was developed in view of the above-mentioned circumstances, and includes a clutch mechanism between the sprocket and the driving gear to switch between winding and rewinding, and a locking member to maintain the switching state. In the above device, an internal mechanism that reciprocates before and after exposure operates the locking member to automatically switch from a rewinding state to a winding state,
To provide a film rewind switching device for a camera which has a simple structure and reliable operation, in which a rewind button is locked no matter what position the film is in during winding.

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

Figure 1 shows the device set in a state where it can be rewound. 1 is a winding lever, 2 is a winding lever shaft that reciprocates with the lever, and 3 is a winding lever shaft that is integrated with the winding lever shaft 2. A gear 4 is connected to the one-way clutch pawl via a roller 3'.

4' is a hoisting shaft that transmits the rotation of the hoisting lever shaft 2, and gear 4
It is integrated with.

Rotation of the lever 1 in the winding direction, that is, in the direction of arrow C, is transmitted to the shutter charge mechanism described later by a gear 4.5, and a two-stage structure is formed by a gear 6 integrally provided at the lower end of the winding shaft 4'. is transmitted to the sprocket 9 by the sprocket gear 8 via the gears 7a and 7b, and the spool gear 1
0 to the spool 11.

The spool 11 has an integrated gear 11',
This gear 11' meshes with a gear 12 having a claw portion 12'.

The spool 11 is connected to the spool gear 10 by the rotation of the gear 7b.
Also, the spring 13 rotates through frictional engagement with the end surface of the toothed portion 11' of the spool 11.

On the other hand, a clutch mechanism is provided between the sprocket 9 and the gear 8, and the clutch pin 14a implanted in the sprocket shaft 14 is depressed into the clutch groove 8'' of the cylindrical portion 8' of the sprocket gear 8. At this time, the rotation of the sprocket shaft 14 is transmitted to the sprocket 9 by the coaxially installed pin 14b, and the sprocket 9 rotates.

15 is a compression spring that biases the sprocket shaft 14 in the downward direction.

Reference numeral 14c is a well-known rewind button attached to the end of the sprocket shaft 14, which also serves as a button used in multiple exposure photography.

Reference numeral 16 denotes a rewind holding lever, which is rotated counterclockwise by a spring 16a and has a rising portion 16b and a falling portion 16.
I have c.

In the state shown in the figure, the tip of the rewind holding lever 16 engages with the stepped portion 14d of the sprocket shaft 14 to prevent the shaft 14 from descending, thereby holding the clutch in the disengaged state.

Further, the rising portion 16b engages with the spool locking lever 17,
The other end claw portion 17a is urged to rotate clockwise by a spring 17b so as to lock the claw portion 12' of the gear 12.

Reference numeral 35 denotes an automatic aperture pin of a photographing lens (not shown), which is engaged with a bent portion 18'a of the automatic aperture lever 18 on the camera side.

The lever 18 has rising parts 18b and 18c, and a spring 1
It is rotated counterclockwise by 8d.

Reference numeral 19 denotes a rewind release lever, and its tip 19a is configured to be pressed down by the rising portion 18b of the automatic aperture lever 18 in the vicinity of the aperture completion position. 19b, it is rotated clockwise.

The other rising portion 18c of the automatic aperture lever 18 engages with a locking portion 22a of a two-pronged locking lever 22, which is rotatably provided on a shaft 21a fixed to the automatic aperture accumulating lever 21.

The lever 22 is urged to rotate counterclockwise by a spring 22c, and the other end 22b engages with a rising portion of the automatic aperture lever.

The automatic aperture accumulating lever 21 is rotated clockwise by a spring 21c against the springs 18d, 19b, and an unillustrated spring of the automatic aperture pin 35, and the falling portion 21b releases the shutter button (not shown). It is locked by a locking lever 23 which rotates by.

Reference numeral 33 denotes an automatic aperture charge lever, which is charged using the gear 6 of the winding lever 1 using a known method. Next, the shutter is a known focal plane shutter with a leading master gear 24 and a trailing master gear 25. The leading master gear 24 is charged by winding the winding lever 1 through the gear 45 in a known manner.

By charging the leading master gear 24, the trailing curtain is simultaneously charged by the pin 24a via the pin 25a of the trailing master gear 25.

26.27 are the pinions of the front curtain and rear curtain, and the front curtain ribbon 28
, there is a rear curtain 29.

A gear 30a is fixed to the lower end of the trailing pinion shaft 30, and there is a trailing end signal gear 31 meshing with the gear 30a, and this gear 31 has a pin 31a implanted therein.

Reference numeral 32 denotes a leading curtain release lever for releasing the shirt by a known method.

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

When performing a rewind operation at the end of film shooting or during shooting, when the rewind button 14c is pushed up in the direction of the arrow, the rewind holding lever 16 is rotated by the spring 16a and engaged with the stepped portion 14d of the sprocket shaft 14. Together, the sprocket shaft 14
is held against the downward force of the spring 15, and the clutch pin 1
4a is the clutch groove 8 of the cylindrical portion 8' of the sprocket gear 8
” to leave.

Therefore, the rotation of sprocket gear 8 is no longer transmitted to sprocket 9.

Therefore, the sprocket 9 can rotate freely.

Further, since the rising portion 16b of the rewind holding lever 16 releases the spool locking lever 17, the claw portion 17a locks the claw portion 12' due to the spring 17b.

Therefore, the gear 12 becomes unable to rotate in the winding direction, and the spool 11 becomes unable to rotate in the winding direction.

However, the locking state between the pawl 12' of the gear 12 and the spool locking lever 17 is such that it slips when the spool 11 rotates in the unwinding direction.

Therefore, the film can be rewound by a known rewinding operation.

Then, load a new film and turn the winding lever 1 to arrow C.
When winding in the direction, this operation charges the gears 24, 25 of the shutter mechanism via the gears 4, 5 and the auto-diaphragm mechanism via the auto-diaphragm charge lever 33.

After winding is completed, the locking lever 23 is rotated in the direction of arrow B by the release of a shutter button (not shown), the locking of the automatic aperture accumulating lever 21 is released, and the locking lever 21 is rotated clockwise by the spring 21c.

At this time, the two-prong locking lever 22 also rotates in the same direction while locking the rising portion 18c, and the automatic aperture pin 35 of the photographing lens is rotated by the automatic aperture lever 18 to perform narrowing down.

Near the stop-down completion position of the automatic aperture lever 18, the rewind release lever 19 has its tip 19a at a rising portion 18b.
Since it is pushed against the spring 19b, it rotates counterclockwise.

Therefore, the lever 19 rotates the rewind holding lever 16 clockwise by the pin 19c at the other end.

As the rewind holding lever 16 rotates clockwise, the tip of the lever 16 separates from the stepped portion 14d of the sprocket shaft 14, so the sprocket shaft 14 is released from holding and the spring 1
5, the clutch pin 14a engages with the clutch groove 8' of the cylindrical portion 8' of the sprocket gear 8, and the clutch returns to the connected state.

On the other hand, the rising portion 16b at the other end of the rewind holding lever 16 rotates the spool locking lever 17 counterclockwise against the spring 17b to separate it from the claw portion 12'.

By the aperture operation of the automatic aperture mechanism, the interlocking relationship between the sprocket 9 and the spool 11 is restored, and the film feeding mechanism is driven by the winding lever 1.

Further, the camera is operated by releasing the front curtain release lever 32 of the shutter by a known method when the automatic aperture mechanism completes the aperture, and starts the front curtain and runs the rear curtain to perform aerial photography.

At this time, the rear curtain travels through the gear 30a of the rear curtain pinion shaft 30.
The gear 31 is rotated in the direction of the arrow through the pin 31a.
When the rear curtain travel is completed, the two-pronged locking lever 2 is
One end 22b of 2 is rotated clockwise against the spring 22c.

Therefore, the claw portion 22a is attached to the rising portion 1 of the automatic aperture lever 18.
8c, the automatic aperture lever 18 is rotated counterclockwise by the spring 18d.

By rotating the automatic aperture lever 18, the automatic aperture pin 35 of the photographic lens returns to the open side, and the aperture of the photographic lens returns to the open position.

At this time, the rewind release lever 19 is stopped at the position of the stopper pin 20 by the spring 19b.

In the embodiments described above, the setting for rewinding is released by an automatic diaphragm mechanism, but a case where the setting for rewinding is released by a mirror lifting mechanism will be explained with reference to FIG.

In FIG. 2, the same parts as in FIG. 1 are given the same reference numerals, and detailed explanation thereof will be omitted.

Reference numeral 100 denotes a rewind holding lever which has a three-pronged shape, one end of which engages with the stepped portion 14d of the sprocket shaft 14d, the rising portion of which engages with the spool locking lever 17, and the other end of which is linked to the mirror of 101 to move up and down. It engages with the slope portion 101a of the rewind release slider.

Reference numeral 102 denotes a mirror drive lever, on which a flip-up lever 103 is pivotally supported at the same time as the mirror drive lever.

Further, a mirror locking claw 104 is pivotally supported on the mirror drive lever 102, and this locking claw 104 is connected to the flip-up lever 10.
It has a bent portion 104a that engages with the claw portion of No. 3.

The mirror drive lever 102 is urged to rotate counterclockwise by a spring 102a.

The tip of the flip-up lever 103 engages with the slider 101 when the mirror is raised, and presses the slider downward against a spring.

105 is a push-up lever having an arm that engages with a pin 106a of the mirror, and the pin 10 is implanted in the narrow arm of the lever.
5a engages with the flip-up lever 103.

106 is a mirror receiving plate, and this receiving plate 106 has a pin 106a.
and a spring 106b that urges the receiving plate 106 downward.

Reference numeral 107 denotes an intermediate lever that engages with the tip of the mirror drive lever 102 to rotate the front curtain release lever 32.

33' is a mirror charge lever.

When a shutter button (not shown) is pressed, the locking lever 23 rotates in the direction of arrow B' to release the locking of the mirror drive lever 102.

Then, the mirror drive lever 102 is rotated counterclockwise by the spring 102a, and the flip-up lever 103 is rotated in the same direction together with the mirror locking claw 104.

Therefore, the push-up lever 105 is pushed by the pin 105a, rotates counterclockwise, pushes the pin 106a with a thin arm, and pushes the mirror receiving plate 106 upward.

In conjunction with this mirror raising operation, the tip of the mirror flip-up lever 103 pushes down the mirror lift signal slider 101, rotates the rewind holding lever 100 clockwise, releases the hold on the sprocket shaft 104, and releases the clutch. By connecting sprocket 9 and spool 11
is restored to the interlocking state, and mechanisms related to film feeding are driven by the winding lever 1.

Further, the tip of the mirror drive lever 102 engages with the intermediate lever 107 near the mirror raised position to rotate the lever,
The shutter locking by the leading curtain release lever 32 is released.

The rear curtain end signal gear 31 is activated by the shutter front curtain and rear curtain running.
rotates in the direction of the arrow, and the pin on the gear pushes the bent portion 104a of the mirror locking pawl 104 to rotate it counterclockwise, thereby releasing the locking of the flip-up lever 103.

Therefore, the mirror is rotated by the lowering spring 106b of the mirror receiving plate 106 and returns to the lowered position.

At this time, since the flip-up lever 103 rotates clockwise, the release slider 101 returns to its original position by the force of the spring.

In addition, when performing multiple exposure photography during normal photography, if the rewind button 14c is pressed in the same way as for the rewind operation, the sprocket 9 will be freed as described above, and at the same time the spool 11 will be rotated in the winding direction. Rotation becomes impossible.

Therefore, if the winding operation is performed in this state, the shutter charge and the automatic aperture mechanism are simply charged, and multiple exposure photography can be performed by releasing the shutter.Moreover, as mentioned above, the automatic aperture mechanism or the mirror elevating mechanism can be used to move the sprocket 9. The interlocking relationship with the spool is restored and the film feeding mechanism returns to the next normal shooting state.

As mentioned above, the present invention uses a holding member that holds the clutch provided between the sprocket and the hoisting gear in a disengaged state by the driving member of the automatic diaphragm mechanism or mirror lifting mechanism that operates in response to the pressing operation of the shutter button. Since the clutch is configured to be released, no matter where the film ends during winding, pressing the rewind button will always keep the clutch in the disengaged state, making it necessary to keep pressing the rewind button during rewinding. Never.

Furthermore, it is possible to provide a film rewind switching device which has the effect that when the rewind state is set due to an erroneous operation, it can be easily released in conjunction with a known aperture member or mirror up member operated from outside the camera.

[Brief explanation of the drawing]

FIG. 1 shows the constituent countries of one embodiment of the present invention, and FIG. 2 shows the constituent countries of another embodiment of the present invention.

Claims (1)

[Scope of utility model registration request] It has a clutch mechanism between the sprocket and the hoisting gear,
In a single-lens reflex camera in which the clutch is disengaged by an external operating means to switch from the film winding state to the rewinding state, and the clutch is held in the disengaged state by a holding member, A release member interlocked with the drive member of the automatic diaphragm mechanism or mirror lifting mechanism that operates is provided so as to be able to engage with the holding member, and when the shutter button is pressed, the drive member moves the holding member via the release member to release the clutch. A film rewinding switching device for a camera, characterized in that the film rewinding switching device for a camera is configured to switch from a rewinding state to a winding state by releasing the holding state.