JPS6058453B2 - camera film winder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a film winding device for a camera.

Prior Art Generally, in a camera film winding device, as the film is wound toward the central side of a film winding member such as a spool, the substantial diameter of the film winding member increases (so-called roll thickening phenomenon occurs). ) Since the amount of film taken up at the same rotation angle increases, in order to prevent excessive winding caused by this thickening of the roll, a friction clutch mechanism is inserted in the drive system from the winding member to the film winding member. The structure is adopted.

Therefore, with conventional devices, there is a problem in that the hoisting member suddenly becomes heavy from the point at which "slippage" occurs at the friction clutch while the hoisting member is being pushed forward, and the hoisting member does not have a good hoisting feel. There were some drawbacks that I can't say. Purpose This invention was made in order to eliminate the above-mentioned conventional drawbacks, and its purpose is to prevent the hoisting torque from fluctuating while pushing the hoisting member. To provide a film winding device for a camera that has an excellent feel.

Embodiment An embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a completed state of film winding and shutter charging, and the winding operation member 4 interlocking with a winding member (not shown) is guided. It is slidable in the left and right directions in the figure by means of the groove 4a and the guide pin 25 installed in the camera body.
It consists of a hoisting operation plate 4 that is biased to the right by a return spring 5, and the hoisting operation plate 4 has two pins 4b and 4c planted therein, and a rack on its lower edge. 4f and protrusion 4d
and a bent piece 4e are integrally formed, and teeth 4g that engage with a reverse movement prevention pawl 26 are formed on the upper edge to prevent reverse movement during forward or backward movement.

1 is a shutter charge lever;
It is movable between a charging position shown by a solid line in the figure and a release position 1'' shown by a chain line in FIG. 1, and has a tendency to move toward the release position 1'' by operating the shutter release.

The stopper member 2, which is supported on a shaft 2a and is given a counterclockwise rotational habit by a spring 3, is a first arm that engages with the charge lever 1 when it is near the release position 1''. 2b, and a second arm that disengages from the protrusion 4d of the hoisting operation plate 4 when it rotates clockwise against the spring 3 due to the engagement described above, thereby allowing the hoisting operation plate 4 to move to the left. 2c, and an arm 2d that can be engaged with a set lever 7, which will be described later.

When the hoisting operation plate 4 moves to the left, the hoisting pawl 6, which is rotatably mounted on a shaft 6a and urged to take a predetermined rotational position by a spring 6b, engages with its pin 4b. It has an engaging claw 6c and a bent piece 6d that can be engaged with a set lever 7, which will be described later.

The set lever 7, which is pivotally connected by a shaft 7a and given a counterclockwise rotational habit by a spring 7b, has three arms, and the first arm 7c is such that the winding pawl 6 is connected to the spring 6b. When the second arm 7d is rotated counterclockwise from the fixed position determined by the bending piece 6d, the second arm 7d
can be engaged with the third arm 2d of the winding member 2 which is in the position rotated counterclockwise as described above, and when the third arm 7e is rotated clockwise, the third arm 7e engages with the third arm 2d, which will be described later. It is formed so as to be able to engage with the knowledge set lever 9.

The tactile set lever 9 is pivotally connected to the camera body by a shaft 9a, is given a counterclockwise rotational tendency by a spring 9b, and its end 9c is normally in contact with the stopper 30.

It fits loosely into the shaft 28 of the camera body through the guide groove 10a, and is given a counterclockwise rotational habit by the spring 10b.
The tactile lever 10, whose rotation is stopped by the stopper 30, has a tactile claw 10c that can engage with the perforation 27a of the film 27 loaded into the camera body, and an end 9c of the tactile set lever 9. Engaging bent piece 10d
An engagement lever 8, which will be described later, can be engaged on the bent piece 10d.

Further, the winding stop lever 11 rotatably supported on the shaft 28 is given a counterclockwise rotational habit by a spring 11b'', and the side edge of the winding stop lever 11 is rotated counterclockwise by a stopper 30. Clockwise rotation is restricted by engaging with the bent piece 10d of the tactile lever 10 that is locked on the protrusion 11.
d is regulated by engaging with the stopper 30.
A large-diameter gear 14 and a small-diameter gear 15 are integrally and coaxially pivotally connected to the shaft 16, and a reverse stopper pawl 23 is engaged with the large-diameter gear 14 to prevent its rotation in the clockwise direction. , meshes with the film winding gear 22a of the winding shaft 22 that winds up the film 27 in the film cassette.

Also, on the shaft 16 is a gear lever 17 having three arms.
is rotatably supported, and this gear lever 17 is given a clockwise rotational habit by a spring 17b hooked on its first arm 17a.
1 and its rotation is inhibited. The tip of the second arm 17c of the gear lever faces within the reciprocating stroke of the pin 4c of the hoisting operation plate 4, and when the hoisting operation plate 4 is moved leftward, it is pushed by the pin 4c. gear lever 17
The whole is rotated counterclockwise against the spring 17b. The operating gear 18, which is pivotally connected to the gear lever 17 by a shaft 18a and meshes with the small diameter gear 15, moves forward when the second arm 17c is pushed by the pin 4c and rotates the entire gear lever 17 counterclockwise as described above. At the same time, the gear lever 17 is pulled by the spring 17b and moves back to the position where the first arm 17a is stopped by the stopper 21. It is formed so that it is retracted from the rack 4f when

The gear lever 17 is further formed with a protrusion 17d, and this protrusion engages with a bent portion 12c of the film take-up reset lever 12, which will be described later, in the counterclockwise rotating position and is restrained from moving to the left. It engages with the protrusion 4d of the hoisting operation plate 4 that moves forward to limit its forward movement. The engagement lever 8, which is rotatably attached to the shaft 13 and has a folded piece 8c and a bent piece 8d, is given a clockwise rotational habit by a spring 8b.

As shown in FIG. 1, the folding piece 8c assumes a clockwise rotating position where it engages on the bent piece 10d of the tactile lever 10 when the tactile lever 10 and the winding stop lever 11 are in the clockwise rotating position. When the engagement lever 8 rotates counterclockwise, it can engage with the upper end 11c of the winding stop lever 11, which is in the counterclockwise rotation position as shown in FIG. The film take-up reset lever 12, which is rotatably mounted on the shaft 13, is given the tendency to rotate counterclockwise by a spring 12b, and its rotation is regulated by a stopper 20.

This film winding reset lever 12 has the protrusion 1
7d to restrain the gear lever 17
2c, and a claw 1 that engages with the bent piece 8d of the engagement lever 8.
2d, and an arm 12e that engages with the pin 4c when the hoisting operation plate 4 is in the backward movement position. Since the present invention is constructed as described above, when the shutter is released in the winding completed state shown in FIG. 1, the charging member 1 moves from the charging position shown by the solid line to the release position 1'' shown by the chain line.

Therefore, the winding member 2 rotates clockwise, and the leftward movement of the protrusion 4d by the second arm 2c is released. In this state, when the hoisting operation plate 4 is moved to the left (forward movement) against the return spring 5, the teeth 4g and the reverse movement prevention pawl 26 engage with each other at the beginning of the leftward movement, and from then on, the hoisting operation plate 4 is moved to the right. Movement is prevented and only left movement is possible. When the winding operation plate 4 moves to the left, the pin 4b rotates the set lever 7 clockwise by rotating the winding pawl 6 counterclockwise, and the tactile set lever 9 adjusts its behavior. Rotate clockwise against the The tactile set lever 9 rotated clockwise raises the tactile lever 10 with respect to the shaft 28 via the bent piece 10d and retracts the tactile claw 10c from the perforation 27a of the film. The lever 10 is rotated counterclockwise by the spring 10b until it engages with the stopper 30. At the same time, the winding stop lever 11 is also rotated counterclockwise by the spring 11b to the position shown in FIG. 2. The upper end 11c of this take-up stop lever 11 locks the folded piece 8c of the engagement lever 8 rotated counterclockwise by the set lever 7, so that the engagement lever 8 is rotated by the spring 8b. Prevents clockwise rotation. By rotating the engaging lever 8 in the counterclockwise direction, the film winding reset lever 12 is
also rotates counterclockwise.

The pin 4c of the hoisting operation plate 4 that moves to the left is connected to the gear lever 17.
, and rotates the gear lever counterclockwise, causing the operating gear 18 to revolve counterclockwise.

When the protrusion 17d of the gear lever 17 and the bent piece 12c of the winding reset lever 12 are engaged with each other, the operating gear 18 is moved to the toothless portion at the right end of the rack 4f of the winding operation plate 4, as shown in FIG. , and is in a state where it can engage with the rack 4f during backward movement. When the reversal prevention pawl 26 is disengaged from the right end of the tooth 4g by the leftward movement of the hoisting operation plate 4, the bent piece 4e that has pushed the shutter charge lever 1 to the charging position moves the gear lever 17 as shown in FIG. Projection 17
After colliding with d, the hoisting operation plate 4 is prevented from moving to the left.

Then, the return spring 5 of the hoisting operation plate enables the return movement to the right, and when this movement to the right starts, the rack 4f rotates the operating gear 18 clockwise. The operating gear 18 is
Since it is prevented from separating from the rack 4f, its rotation is transmitted to the gear 14, causing the gear 14 and the gear 15 to rotate counterclockwise. Therefore, this large diameter gear 1
A film winding gear 22a in the film cassette that meshes with the film 27 rotates clockwise to sequentially wind the film 27. Note that, at this time, the reverse rotation of the film winding gear 22a is prevented by the reverse rotation prevention pawl 23 that engages with the large diameter gear 14. When the film is wound, the film 27 moves to the left with respect to the tactile claw 10c.
c fits into the perforation 27a of the film 27 and is rotated clockwise as the film 27 moves to the left. At the same time, the winding stop lever 711 is also rotated clockwise, and as a result of this rotation, the engagement between the folded piece 8c of the engagement lever 8 and the upper end 11c of the winding stop lever 11 is broken. The lever 8 is rotated clockwise by a spring 8b, and the winding reset lever 12, which is engaged with the lever 8, is rotated clockwise. When the take-up set lever 12 is rotated clockwise, it is released from the lock by the bent piece 12e, so the gear lever 17 is rotated clockwise by the spring 17b, and the operating gear 18 is retracted from the rack 4f. Breaking the mesh between the two (
(stopping film winding). Thereafter, the hoisting operation plate 4 is moved to the right by the return spring 5, and is stopped in the state shown in the first figure in which the anti-reverse claw 26 is disengaged from the left end of the tooth 4g.

Effects According to this invention, when the winding member moves forward, the spring means is charged without winding the film, and when the winding member moves back, the film is wound by the biasing force of the spring means. Compared to the conventional structure in which the film is wound when the winding member moves forward, the film winding device has a uniform winding torque and a good winding feel. can be obtained.

That is, according to the present invention, when the winding member moves forward, the film is not wound, which is a cause of fluctuations in the winding torque, but only the spring means is charged, and the charging of the spring means is always uniform. Therefore, there is no inconvenience that the hoisting member suddenly becomes heavy during the hoisting operation.

[Brief explanation of drawings]

FIG. 1 is a top view showing the configuration of essential parts of an embodiment of the present invention, showing a state in which shutter charging and film winding have been completed, and FIG. 2 shows a state in which only shutter charging has been completed in the same figure as above. This indicates the state in which the 4...Hoisting operation plate (driven member), 4f...
Rack (meshing part), 5...Return spring means), (
(12...Film winding set lever, 17...
- Gear lever, 18... operating gear) control means) clutch mechanism, 15... small diameter gear (winding gear).

Claims (1)

[Scope of Claims] 1 A hoisting member capable of reciprocating motion, a spring means that is charged when the hoisting member moves forward, and a meshing portion, and the spring means is charged when the hoisting member moves backward. a driven member driven by the urging force of the film winding member; a winding gear that drives the film winding member; and when the winding member moves forward, power transmission from the driven member to the winding gear is cut off; A film winding device for a camera, comprising a clutch mechanism that enables power transmission from a driven member to a winding gear during backward movement. 2. The clutch mechanism includes an operating gear that is movable between an operating position in which the driven member and the winding gear are engaged with each other, and a disengaged position in which the driven member and the winding gear are engaged with each other, and a disengaged position that is separated from at least one of the driven members. 2. The film winding device according to claim 1, further comprising control means configured to position the winding member in the separation position and to position the operating gear in the operating position when the winding member moves back. 3. A film winding device for a camera according to claim 1 or 2, which is configured to charge the shutter when the winding member moves forward.