JPH052920Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an unwinding device for a camera, particularly a camera using a roll film without perforation.

[Conventional technology]

Conventionally, in cameras that use raw film without perforation, such as 120 and 220 film, grooves corresponding to the number of shots are provided on the index plate, which rotates less than one revolution in conjunction with the winding of the film. When one end of the index lever falls into this groove, a part of the index lever locks the rotation of the winding member, and the winding release member that operates in conjunction with the release operation releases the index lever. It is driven in the unwinding direction to enable the next winding.

Since a relatively strong urging force is applied to the indexing lever to ensure quick and reliable operation, the unwinding member drives the indexing lever in the unwinding direction against the urging force. An extremely strong urging force was required.

[The problem that the idea attempts to solve]

However, in such a conventional camera winding release device, an extremely strong biasing force acts on the winding release member that drives the index lever in the winding release direction. A strong force is required to drive the locking member that is locked in the charged state in the unlocking direction in conjunction with the release operation.

Therefore, if a camera equipped with an electromagnetic release is used to drive the locking member using its electromagnetic force, a large and powerful magnet is required, making it impossible to store it in a narrow space. Not only will the camera be larger and heavier, but if the electromagnetic force is weakened, for example in a cold region, there is a risk that the release will become impossible. There was a risk of camera shake.

Furthermore, if an attempt is made to release the locking member using a shutter operating member, such as a rear curtain gear of a focal plane shutter, there is a problem in that the shutter operation tends to become unstable.

Furthermore, the unwinding member with a strong biasing force collides with the indexing lever, so that the indexing lever is retracted from the winding member against the biasing force. There were also problems in that the collision generated a large amount of noise, and the durability was impaired due to wear caused by the collision between the two members.

This idea solves these conventional problems,
To provide a camera unwinding device capable of reducing camera release force and preventing noise during release.

[Means to solve the problem]

In order to achieve the above object, the camera winding release device according to this invention prevents the rotation of the winding member by dropping the indexing lever into the groove of the indexing plate that rotates in conjunction with the winding of the film. In a camera winding release device, the winding member is locked, and the winding member is unlocked by a winding release member that stores energy by winding the camera and releases the energy stored in connection with a release operation. A winding release member that engages with the lever and urges the indexing lever to retreat from the indexing plate against the urging force thereof, and restrains the winding release member in an inoperative position in connection with winding. However, a cam member is provided that gradually releases the restraint in connection with the release operation.

[Effect]

With the above configuration, the unwinding member is restrained in the inoperative position by the cam member during winding, so the indexing lever is in a state where it can freely engage with the indexing plate, and the normal Winding can be stopped.

When the camera is released in this state, the cam member, which has been loaded with force due to winding, gradually releases the restraint of the winding release member, so the winding release member gradually indexes the indexing lever against its biasing force. Remove it from the board and release the winding stop.

This eliminates the need for a strong biasing force on the cam member, which is locked in the stored state by winding up and released by release, making the release operation easy. The movement of the winding release member that is released from restraint is controlled by the cam member, and the index lever is gradually driven to release the winding, which prevents noise when winding is released and greatly increases durability. can be improved.

〔Example〕

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

1 and 2 show an embodiment of this invention, with FIG. 1 showing the winding-up state and FIG. 2 showing the release-completed state, respectively.

A drive lever 3 and a hoisting member 4 are integrally fixed to a hoisting shaft 2 that is integrated with the hoisting lever 1.
An interlocking pin 5 is implanted in the winding member 4, and a bent portion 4a is provided in the winding member 4.

A disk 6 and a cam plate 7 which is a cam member are rotatably mounted on the winding shaft 2, and a high step portion 6a, a low step portion 6b and an interlocking pin 5 are loosely fitted to the outer periphery of the disk 6. A recess 7 is formed on the outer circumference of the cam plate 7.
A, a circumferential portion 7b, and a cam surface consisting of a slope portion 7c connecting these portions and a tooth portion 7d are formed, and an arc-shaped long groove 7e into which the interlocking pin 5 is inserted is provided inside.

Note that it is desirable that the circumferential portion 7b of the cam surface is not a complete circumference but slightly lower in the direction of the recessed portion 7a.

The tooth portion 7d of the cam plate 7 meshes with the tooth portion of the main drive gear 8, and a relatively weak spring 9 is engaged with the main drive gear 8 to bias the cam plate 7 clockwise, and the winding lever 1 is moved toward the film. By rotating counterclockwise by a predetermined angle for winding, the interlocking pin 5 moves within the long groove 7e via the drive lever 3, and at the end of the movement, the interlocking pin 5 moves in the long groove 7e.
is pressed to rotate the cam plate 7 in the counterclockwise direction, and the locking lever 11 having a left-handed rotation behavior is activated by the spring 12.
After the cam plate 7 is held in the energized position by locking the toothless portion 7g with the claw portion 11a of The positional relationship between the long groove 7e and the long groove 7e is determined.

On the other hand, a well-known indexing plate 13 that decelerates and transmits the rotation of a friction roller that presses against a film or backing paper has a plurality of grooves 13a on the outer circumference, and is biased counterclockwise in the figure. An indexing auxiliary plate 14 having the same pitch and the same number of grooves 14a on the outer periphery coaxially with 13;
is mounted, and this indexing auxiliary plate 14 is biased clockwise relative to the indexing plate 13 in the figure to maintain the groove portion 13a in the closed position at all times.

Then, the indexing lever 16 is pivotally mounted by the shaft 15, biased in the counterclockwise direction by a relatively strong spring 17, and the bent portion 16a of one end thereof is attached to the outer periphery of the indexing plate 13 and the indexing auxiliary plate 14. A bent portion 16b is formed at the other end so as to allow pressure contact.

Further, the winding lever 19 and the winding release lever 20, which is its winding release member, are pivotally connected together by the shaft 18, and the bent portions 19a and 20a provided on the winding lever 19 and the winding release lever 20, respectively, are split. Exit lever 1
The rotation of the winding member 4 is made such that the winding member 4 can be engaged with the bent portion 16b of the winding member 6 from both sides, and the claw portion 19b at the tip of the winding lever 19 is opposed to the bent portion 4a of the winding member 4. A roller 22 is attached to the tip of the unwinding lever 20 by a shaft 21.
is rotatably supported so that the roller 22 can engage with the cam surface of the cam plate 7.

Further, the wind stop lever 19 is held by a relatively weak spring 23.
The unwind release lever 20 is urged counterclockwise by a spring 24 stronger than the spring 17, and its rotation end is restricted by stoppers 25 and 26, respectively.

Next, the operation of the embodiment of this invention constructed as described above will be explained.

When the locking lever 11 is driven in the direction of arrow A against the biasing force of the spring 12 by a release operation from the completed winding state shown in FIG. 1, the locking of the toothless portion 7g by the claw portion 11a is released. As the shutter (not shown) operates, the cam plate 7 rotates clockwise due to the biasing force of the spring 9, and the unwinding release lever 2
0 roller 22 rolls from the circumferential portion 7b to the slope portion 7c, falls into the recess 7a, and engages with the low step portion 6b of the disc 6, so that the unwinding lever 20 is activated by the strong spring 24. Gradually rotate to the left without any shock or noise.

By turning the unwinding lever 20 to the left, its bent portion 20a turns the indexing lever 16 to the right against the spring 17, and the bent portion 16a separates from the groove 13a of the indexing plate 13, and the indexing lever 16 bends 16
b, press the bent portion 19a of the wind stop lever 19 in the counterclockwise direction against the biasing force of the spring 23, and the claw portion 1
9b is retracted out of the rotation range of the winding member 4, and the groove 13a of the indexing plate 13 is closed by the clockwise rotation of the indexing auxiliary plate 14, resulting in the state shown in FIG.

From this state, when the winding lever 1 is rotated by a predetermined angle counterclockwise for winding, the interlocking pin 5 is rotated by the same angle in the same direction along with the disc 6 via the drive lever 3, and the roller 22 is rotated by the same angle. Since the low step part 6b of the disc 6 engages with the high step part 6a, the unwinding release lever 2
0 rotates to the right against the biasing force of the spring 24, its bent portion 20a releases the pressure on the bent portion 16b, and the index lever 16 rotates to the left due to the biasing force of the spring 17, and its bent portion 16a comes into pressure contact with the outer circumference of the indexing auxiliary lever 14.

By turning the indexing lever 16 to the left, the pressing of the bending part 19a by the winding release lever 20 via the bending part 16b is released, so that the winding lever 19 is moved by the spring 2.
The bending portion 4 of the stopper member 4 rotates to the right due to the urging force of 3.
A is now in a state where it can be locked.

When the winding lever 1 reaches the end of its rotation, the interlocking pin 5 presses the end 7f of the long groove 7e counterclockwise to rotate the cam plate 7 by a predetermined angle and lock it in that position by the locking lever 11. Then, when the roller 22 is engaged with the circumferential portion 7b of the cam plate 7 and the hoisting member 4 and the disc 6 are returned clockwise by the return of the hoisting lever 1, at the end of the return, the hoisting member 4 is The bent portion 4a comes into sliding contact with the wind stop lever 19, and after the wind stop lever 19 is rotated to the left against the biasing force, it becomes in a state where it can be locked by the claw portion 19b, and the state shown in FIG. 1 is again achieved. .

Next, FIGS. 3 and 4 show another embodiment of this invention, which is a partial modification of the previous embodiment.

In this embodiment, the shape of the cam plate 7 of the previous embodiment is changed to form a cam plate 37.
A recessed portion 37a, a circumferential portion 37b, and a sloped portion 3 on the outer periphery.
A cam surface consisting of 7c is formed, and a long groove 37e is formed inside.
, and a protrusion 3 is formed on the outer periphery instead of a toothed part.
A relatively weak spring 39 is engaged between the protrusion 37d and the stopper 26 to urge the cam plate 37 clockwise, and the claw 11a of the locking lever 11 is used to close the step 37g. It is designed so that it can be locked.

Note that the other configurations are the same as the previous embodiment shown in FIGS. 1 and 2.

According to this embodiment, the teeth provided on the outer circumferential portion of the cam plate 37 and the main drive gear that meshes with the teeth are not required, and the structure of the unwinding device can be simplified.

[Effects of the invention] As described above, the camera winding release device according to this invention has a winding release member that urges the indexing lever to retreat from the indexing plate against the biasing force of the winding release device. Since the cam member is restrained in an inoperative position in relation to winding, and the restraint is gradually released in relation to the release operation, the cam member that restricts the movement of the winding release member having a strong biasing force is It is sufficient to apply a relatively weak biasing force, and the force needed to release the cam member from the charged state by the release operation is small.

In addition, since the unwinding member does not collide with the index lever unlike in conventional unwinding devices, noise during unwinding is prevented, and wear on parts is drastically reduced. The durability can be greatly improved.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the completed winding state of one embodiment of this invention, Fig. 2 is a plan view showing the same released state, and Fig. 3 is a plan view showing the completed winding state of another embodiment of this invention. FIG. 4 is a plan view showing the release completed state. 1... Hoisting lever, 4... Hoisting member, 5... Interlocking pin, 6... Disc, 7... Cam plate, 7a, 7
b, 7c...cam surface, 11...locking lever, 13
... Index plate, 13a ... Groove portion, 16 ... Index lever, 19 ... Wind stop lever, 20 ... Wind stop release lever, 22 ... Roller, 37 ... Cam plate, 37a,
37b, 37c...cam surface.

Claims (1)

[Claim for Utility Model Registration] The indexing lever falls into the groove of the indexing plate that rotates in conjunction with the winding of the film, thereby locking the rotation of the winding member, and when the film winds, the energy is stored and the release is operated. The winding release device for a camera is configured to release the locking of the winding member by a winding release member that releases its stored energy in connection with the winding release member, which engages with the indexing lever; a winding release member that is biased to retreat from the index plate against the biasing force thereof; What is claimed is: 1. An unwinding device for a camera, comprising a cam member that gradually releases the restraint.