JPS6144192Y2 - - Google Patents

Description

[Detailed description of the invention] This invention does not require aerial photographing operations.
The present invention relates to a blank winding mechanism for winding a loaded film to a shooting start position.

Generally, in self-winding type cameras, double winding is prevented by a double winding prevention lever whose position is controlled by the shutter.
To wind the loaded film to the shooting start position,
It is necessary to repeat the film winding operation and the shutter release operation several times.

In order to eliminate the hassle of such aerial photography,
Previously, the ``device for omitting aerial photography of the front and rear edges of the film in a camera'' was described in Japanese Patent Publication No. 10777/1977.
is proposed. However, this blank copy omitting device uses a cam lever that is in constant sliding contact with a cam fixed to the film counter and related members to enable continuous winding up to the shooting start position. Load torque will always act. Therefore, with such a structure, not only does the load on the counter feeding system increase, but also the load torque of the cam lever makes the incremental feeding of the counter itself inaccurate, and erroneous display is likely to occur.

In order to eliminate the structural drawbacks of the conventional device described above, the present invention has been developed to prevent double winding, which is biased in the direction of intervening within the motion trajectory of the member reciprocated during the film winding operation. A lever is provided, and these two
An idle feed lever that urges the double hoisting prevention lever in a direction to retract the heavy hoisting prevention lever out of the movement trajectory is engaged with the double hoisting prevention lever, and in the latter half of the forward movement of the member, the double hoisting prevention lever is moved in the opposite direction to the urging direction. One end of the locking lever, which has one end of the jump feed lever facing the member so as to be moved by the member, and can lock the jump feed lever in accordance with the position of the operating piece of the counter that is advanced by the film winding operation. is given a return habit so as to face the idle feed lever, and when the operating piece is not detected by the locking lever, the idle feed lever is locked at a specific position, and the double hoisting prevention lever moves along the movement trajectory. A restoring lever that forcibly retracts the locking lever from the operating piece and allows the counter to return when the camera back cover is opened is removable from the locking lever. This paper proposes an empty winding mechanism for a camera.

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

In FIG. 1, a counter ratchet 2, which can rotate around a mounting screw 1, is biased in the return direction, that is, in the direction of arrow A, by a spring (not shown). This counter ratchet 2 is moved in the opposite direction to the arrow A by an angle corresponding to the arrangement pitch P of the display characters 3 by a well-known feed claw as described in Japanese Patent Publication No. 43-10777. be advanced. Further, at the lower part of the counter ratchet 2, there is a winding cam, which is a member that is reciprocated in the direction of arrow B by, for example, a film winding operation based on a suitable auto winder device or manual winding device (both not shown). There are 4. This winding cam 4
a blocking surface 4a formed on the front surface in the forward movement direction;
Although it includes an operating pin 4b planted on the surface, the functions of these blocking surfaces 4a and operating pins 4b will become clear from the description below.

In the same plane as the winding cam 4, a double winding prevention lever 6 whose base portion is swingably supported by a screw 5 is positioned. The double hoisting prevention lever 6 is biased in the direction of arrow C by a spring (not shown).
It has a tip portion 6a that intervenes within the locus of movement of the winding cam 4 and locks the blocking surface 4a. Also,
The double hoisting prevention lever 6 is provided with an upright piece 6b that is folded up at right angles, and this upright piece 6b has an automatic
A make switch 7 incorporated into the winder's motor circuit is shown. Note that a linking member 8 faces the double winding prevention lever 6, and this linking member 8 will be explained in the explanation of its operation.

At a position adjacent to the double hoist prevention lever 6, there is provided an idle feed lever 9, a portion of which is rotatably supported by a set screw 8A. The idle feed lever 9, which is biased in the direction of arrow D by a spring 9A, has three arms 9a, 9b, and 9c, and the arm 9a is extended onto the double winding prevention lever 6 and is attached to the upright piece 6b. collided. Further, the arm 9b is extended above the winding cam 4, so that the operating pin 4b is engaged with this arm 9b in the latter half of forward movement of the winding cam 4, and the idle feed lever 9 is moved in the opposite direction to the arrow D. slightly moved. The remaining arm 9c has an upright engagement piece 9d, which faces one end of the locking lever 10, and a break incorporated into the motor circuit of the auto winder. Switch 11 is facing me.

The locking lever 10 is supported at its intermediate portion by a screw 12 and biased in the direction of arrow E by a spring 13. The locking lever 10 has a bent piece 14 formed at the tip of one arm 10a, and this bent piece 14 faces an operating piece 15, that is, operating means provided on the counter ratchet 2. This operating piece 15 is a counter ratchet 2 corresponding to the amount of film feed.
It has an arc length P1 (in the illustrated example, three times the array pitch P) that matches the step angle P×n (number of pieces). Further, the other arm 10b of the locking lever 10 has a jaw surface 10c that can be engaged with the engagement piece 9d of the idle feed lever 9. Therefore, when the bending piece 14 is disengaged from the operating piece 15, the locking lever 10 assumes a rotated position in the direction of the arrow E, and as a result, the jaw surface 10c moves the idle feed lever 9 toward the arrow D. Return to direction is prevented.

Meanwhile, according to the present invention, a restoring lever 17 is provided which is sensitive to the back cover 16 of the camera. screw 18
The restoring lever 17 supported by is urged in the direction of arrow F by the force of the spring 19. Restoration lever 1
7 is an arm 1 that engages with a protrusion 16a of the camera back cover 16;
7a, therefore, when the back cover 16 is opened, the restoring lever 17 is in a rotated position in the direction of arrow F, and the bent piece 14 of the locking lever 10 is rotated by the engaging surface 17b. is moved out of the motion trajectory of the operating piece 15. The restoring lever 17 also includes an arm 17c, on which the base of a linking lever 20 is supported by a screw 19, and an elongated hole 21 formed at the tip of the linking lever 20 is provided with the idle feed lever 9. A pin 22 placed on the surface is inserted. This configuration provides a structure in which the link lever 20 forcibly biases the idle feed lever 9 in the direction opposite to the arrow D when the back cover 16 of the camera is opened.

In the above embodiment, if the auto winder is not used, the make switch 7 and the break switch 11 can be omitted, and the structure is such that aerial photography cannot be performed when the camera back cover is opened. In this case, the link lever 20 and pin 22 can be omitted.

Next, the operation of the embodiment apparatus described above with reference to FIGS. 2 to 5 will be explained.

FIG. 2 shows the state of the camera just before closing the back cover 16 and starting empty winding. In this state, the restoration lever 17 is moved to the illustrated position by the camera back 16, so the linkage lever 20 releases the restraint on the idle feed lever 9, and the force of the spring 9A keeps the idle feed lever 9 in the illustrated position. The double winding prevention lever 6 is retracted out of the locus of motion of the winding cam 4. Therefore, when film winding is started from this state, the operating pin 4b comes into contact with the arm 9b of the idle feed lever 9 in the latter half of the forward movement of the winding cam 4, as shown in FIG. 3. Temporarily rotate to the position shown. In this case, since the locking lever 10 is held in the position shown in FIG. 3 by the operating piece 15, the idle feed lever 9 returns to the position shown in FIG. 2 along with the return of the winding cam 4. Since this phenomenon occurs until the operating piece 15 is released from the locking lever 10, it is possible to wind the film several times without shutter release.

FIG. 4 shows the state immediately after the above-mentioned film winding is completed. That is, immediately before the dry winding is completed, the operating piece 15 moves the bending piece 1 of the locking lever 10.
4, and the locking lever 10 is rotated in the direction of arrow E by the force of the spring 13. Therefore, when the idle feed lever 9 is rotated by the operation pin 4b in the latter half of forward movement of the winding cam 4, the engaging piece 9d of the idle feed lever 9 is locked with the jaw surface 10c of the locking lever 10. As a result, the double winding prevention lever 6 follows the empty feed lever 9 and intervenes within the locus of movement of the winding cam 4 as shown in the fourth figure, thereby preventing the film from being double wound. Further, the double hoisting prevention lever 6 is moved to the position indicated by the imaginary line after the shutter travel is completed by the linking member 8 which assumes the position shown by the solid line in FIG. Since it is evacuated out of the trajectory, it is possible to rewind the film.

FIG. 5 shows the positional relationship of each member when the back cover 16 of the camera is opened. When the camera back cover 16 is opened, the restoring lever 17 is rotated in the direction of arrow F by the force of the spring 19, and the engaging surface 1 of the restoring lever 17 is rotated by the force of the spring 19.
7b, the bent piece 14 of the locking lever 10 is retracted out of the movement range of the operating piece 15. As a result, the counter ratchet 2, released from the restraint by another tripping mechanism, returns in the direction of arrow A. At the same time, the linking lever 20 coupled to the restoring lever 17
As a result, the idle feed lever 9 is forcibly rotated to the position shown in the fifth figure, so that the shutter can be wound.

In the above embodiment, the shutter release can be performed even during the idle winding operation, but in order to perform the release lock during the same operation, the release lever must be selectively moved by the position of the locking lever 10. This is achieved by locking. In the above embodiment, only the dry winding of the front end of the film has been described, but by simply changing the arc length and position of the operating piece 15, the dry winding of the rear end of the film is also possible.

As a result, the empty winding mechanism of the camera according to the present invention achieves a structure in which no load is placed on the counter ratchet during normal counting. Therefore, unlike the conventional case, the advance of the counter ratchet itself does not become uncertain due to the addition of an empty winding mechanism.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the empty winding mechanism of the camera according to the present invention, and FIGS. 2 to 5 are explanatory diagrams of the operation of the same empty winding mechanism. 2... Counter ratchet, 4... Winding cam, 6... Double winding prevention lever, 9... Drop feed lever, 10... Locking lever, 15... Operating piece, 1
7...Restore lever.

Claims (1)

[Scope of utility model registration request] A double winding prevention lever is provided that is biased in a direction that intervenes in the motion trajectory of a member reciprocated by a film winding operation, and the double winding prevention lever is biased in a direction that moves the double winding prevention lever out of the motion trajectory. A null feed lever to be biased is engaged with the double winding prevention lever, and the blank feed lever is attached to the member so that it is moved by the member in a direction opposite to the biasing direction in the latter half of forward movement of the member. One end of the locking lever is facing, and one end of the locking lever can lock the empty feed lever according to the position of the operating piece of the counter that is advanced by the film winding operation.
A return habit is given to the idle feed lever to face the idle feed lever, and when the operating piece is not detected by the locking lever, the idle feed lever is locked at a specific position so that the double hoist prevention lever is within the movement locus. A restoring lever is removably attached to the locking lever, and the restoring lever forcibly retracts the locking lever from the operating piece to allow the counter to return when the camera back cover is opened. The empty winding mechanism of the camera.