JPS6139410Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for preventing double feeding of film in a camera and double charging of a shutter.

(Prior Art) Winding of film in a camera is normally performed by rotating a film winding lever. This winding operation simultaneously charges the shutter.

At this time, as a device to prevent double winding of the film,
There is one shown in Publication No. 48-83826.

In this device, when the film is wound, the engaging surface of the ratchet plate that interlocks with the winding lever is
It is locked to the protruding piece of the intermediate lever that has been given a neutral restoring behavior, and furthermore, the engagement surface of this intermediate lever is locked to the protruding piece of the lock lever, and in this state, the second part of the film is When a heavy winding force is applied, the load is applied between the ratch plate and the intermediate lever, and between this intermediate lever and the lock lever.

(Problem to be solved by the invention) In the above structure, the load of double winding of the film is
Since the load is transmitted to a plurality of members in sequence, unless each transmission part can withstand the load reliably, double winding of the film cannot be prevented, and therefore, the operation tends to be uncertain.

In addition, the intermediate lever between the ratchet plate and the lock lever is given a neutral restoring behavior, and this lever interlocks with the ratchet plate and the lock lever in a complicated manner during the forward and backward movements of the ratchet plate. The structure is such that the lever is locked to the lock lever, and this locked lever locks the ratchet plate, so from this point of view as well, the operation tends to be uncertain.
It was a pain to assemble.

The present invention was devised in view of these points, and an object of the present invention is to provide a film double winding prevention device that operates reliably.

(Structure of the invention) (Means for solving the problem) The film double winding prevention device of the present invention has a film winding lever 6 that reciprocates and a guide pin 12 at an eccentric position. It has a rotating plate 2 that reciprocates at a certain angle in conjunction with the rotating plate 2, and a guide hole 16 that engages with the guide pin 12,
Through this engagement, the rotating plate 2 rotates back and forth about the shaft 13, and a locking portion 17 is formed in a part of the guide hole 16, and the guide pin 12 is locked by the locking portion 17. an actuating plate 3 that stops and prevents the forward movement of the rotary plate 2; a spring 14 that biases the actuating plate 3 in the forward movement direction and locks the guide pin 12 at the locking portion 17; A return lever 4 that rotates back and forth in conjunction with the actuation plate 3, and the return lever 4 is biased in the direction of backward movement to cause the actuation plate 3 to move back and the locking portion 17 locks the guide pin 12. a spring 21 for releasing the return lever 4; and a locking member 5 for locking the return lever 4 after the forward movement of the return lever 4 to prevent the return movement and releasing the prevention of the return movement of the return lever 4 in conjunction with shutter operation. It is equipped with the following.

(Function) The film double winding prevention device of the present invention includes a guide pin 12 of a rotary plate 2 which is interlocked with the rotational operation of the film winding lever 6, and an actuating plate 3 which is engaged with the guide pin 12. The guide hole 16 and a locking portion 17 formed in a part of the guide hole 16 transmit the movement of the winding lever 6 and prevent the movement thereof.

(Example) Hereinafter, an example of the present invention will be specifically described based on the drawings.

The film double winding prevention device is composed of a rotating plate 2, an operating plate 3, a return lever 4, and a locking member 5.

As shown in FIG. 1, the rotary plate 2 is fixed to a shaft 7 of a film winding lever 6, and is rotated at a winding angle θ (1/3
rotation). This rotary plate 2 is connected to the shaft 7
In order to move the ratchet wheel 9 of the gear 8, which is loosely fitted into the gear, only in the direction of one rotation as indicated by the arrow, a tension pawl 10 is provided which is biased by a tension spring 11. The gear 8 is engaged with a film sprocket wheel 27 for driving the film spool, as shown in FIGS. 2 to 4. The film winding lever 6 and the rotary plate 2 are rotated by a winding angle θ in the forward motion direction indicated by the solid line arrow in FIG. , wait at the original position. A guide pin 12 that engages with a part of the actuating plate 3 is provided at an eccentric position of the rotary plate 2.

The actuating plate 3 is rotatably supported by a shaft 13 in, for example, a substantially angular shape, and is biased in the clockwise direction, which is the forward movement direction, by a tension spring 14 of medium strength. This actuating plate 3 has a pin 15 on one side.
On the other hand, a substantially L-shaped guide hole 16 and a locking portion 17 formed by a part of this guide hole 16 are provided. The guide pin 12 of the actuating plate 2 is inserted into the guide hole 16, moves along the guide hole 16, and is locked by a locking portion 17. The return lever 4 has a pin 18 and a locking step 19 at the end so as to be interlocked with the actuating plate 3, and has a support shaft 20.
It is supported by a strong tension spring 21 and biased clockwise, which is the direction of reverse movement. The interlocking relationship between the return lever 4 and the actuating plate 3 is obtained directly or indirectly. In the illustrated embodiment, since they are in separate positions, a lever 22 as an idle member is disposed between them. This lever 22 is approximately L-shaped, is rotatably supported by a support shaft 23, is biased by a weak tension spring 24 as necessary, and has one end attached to a pin 15 of the actuating plate 3.
The other end touches the pin 18 of the return lever 4.

The locking member 5 is supported by a support shaft 25, biased counterclockwise by a tension spring 26, and locks the locking step 19 of the return lever 4 when necessary to prevent a return movement. The lock member 5 is forcibly driven clockwise each time a photograph is taken in conjunction with the shutter operation.

Next, this double winding prevention device operates as follows. When the film is not wound, the guide pin 12 of the rotary plate 2 is at the position of line A as shown in FIG. Further, the locking member 5 and the locking step portion of the return lever 4 are in a disengaged state. Further, the actuating plate 3 is connected to a return lever 4 by a tension spring 21.
It receives the clockwise rotational force of the return operation, and then receives the counterclockwise rotational force. Therefore, the guide pin 12 is in a position disengaged from the locking portion 17, and is in a state where it can rotate clockwise in forward motion at any time.

When the user rotates the film winding lever 6 by an angle .theta. in the forward motion clockwise, the rotary plate 2 rotates in the same direction by the same angle as shown in FIG. At this time, since the tension pawl 10 comes into contact with the teeth of the ratchet wheel 9, the gear 8 drives the film sprocket wheel 27 to wind up the film and simultaneously charge the shutter. Further, since the guide pin 12 moves along the lower edge of the guide hole 16 by the winding angle θ, the actuating plate 3 is driven by this and rotates clockwise by the rotation angle α with the same forward movement difference. Therefore, the lever 22 also rotates clockwise, and then the return lever 4 rotates counterclockwise in the forward motion. This rotational movement causes the locking member 5 to lock the locking step 19 of the return lever 4.

When this winding operation is completed, the rotating plate 2 together with the film winding lever 6 rotates counterclockwise in a backward motion and automatically returns to its original position as shown in FIG. In this case, the guide pin 12 slides on the upper edge of the guide hole 16 and finally comes to the position of the locking part 17. At this time, since the actuating plate 3 is biased clockwise by the tension spring 14, the guide pin 12 immediately enters the locking portion 17 of the guide hole 16. On the other hand, the return lever 4 remains locked to the locking member 5, so it is not related to the actuating plate 3.

Therefore, even if the user accidentally tries to wind the film again when the film is wound and the shutter is charged as shown in FIG. Since the film winding lever 6 cannot be displaced in this direction, rotation of the film winding lever 6 is prohibited.

However, when the shutter operates, the lock member 5 is forcibly driven clockwise, and the return lever 4 is
Since the lock is released, the film can be wound again. In other words, when the lock is released, the actuating plate 3 is slightly rotated counterclockwise due to the strong rotational force in the clockwise direction during the return movement of the return lever 4, and the guide pin 12 is moved to the locking portion 17. out of the second
This is because the process returns to the standby state shown in the figure.

(Effect of the invention) According to the invention, the rotational movement of the rotating plate 2 is prevented by the locking force of the tension of the actuating plate 3 by the guide pin 12 of the rotating plate 2 and the locking portion 17 of the actuating plate 3. Therefore, the manual operating force of the winding lever 6 can be sufficiently countered, and the operating force blocking member is the guide pin 1.
2 and the actuating plate 3 provided with the guide hole 16 provided with the locking part 17, no unreasonable force is applied to the other return levers 4 or the locking member 5. Therefore, it has the advantage of being robust and that a light force is enough to release the lock.Moreover, the guide pin 12 of the rotary plate 2 that interlocks with the film winding lever 6 is the guide pin of the actuating plate 3. When the rotary plate 2 rotates, the actuating plate 3 is engaged through the guide pin 12 and the guide hole 16.
Because of the structure in which the guide pin 12 is rotated passively, there is no fear that the guide pin 12 will come off the guide hole 16, and therefore assembly is easy, and the actuating plate 3 operates reliably and interlocks with the film winding lever 6. It has the advantage of preventing the rotating plate 2 from rotating and reliably preventing double winding of the film.
The interlocking from the rotating plate 2 to the locking member 5 during the forward movement and the interlocking from the locking member 5 to the rotating plate 2 during the backward movement are both simple and reliable.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the film winding mechanism seen from below, Figure 2 is a bottom view of the film double winding prevention device after photographing, and Figure 3 is the state when film winding is completed. FIG. 4 is a bottom view of the device in the film winding state, that is, in the shutter charging state. 2... Rotating plate, 3... Operating plate, 4... Return lever, 5... Lock member, 6... Film winding lever, 12... Guide pin, 13... Shaft, 14...
... Spring, 16 ... Guide hole, 17 ... Locking part, 2
1... Spring.

Claims (1)

[Scope of utility model registration request] A film winding lever 6 that rotates back and forth; a rotating plate 2 that has a guide pin 12 at an eccentric position and that rotates back and forth at a certain angle in conjunction with the film winding lever 6; and a guide hole that engages with the guide pin 12. 1
6, and through this engagement, it rotates reciprocally about the shaft 13 in conjunction with the rotating plate 2, and the guide hole 16
A locking portion 17 is formed in a part of the actuating plate 3, which locks the guide pin 12 and prevents the forward movement of the rotary plate 2; a spring 14 that is biased to lock the guide pin 12 at the locking portion 17; a return lever 4 that rotates back and forth in conjunction with the actuating plate 3; and a spring 14 that biases the return lever 4 in the backward motion direction. The guide pin 12 is moved by the locking portion 17 by causing the actuating plate 3 to double-operate.
a spring 21 for releasing the lock, and the return lever 4
A locking member 5 that locks the return lever 4 to prevent the return movement after the forward movement and releases the prevention of the return movement of the return lever 4 in conjunction with shutter operation. Heavy winding prevention device.