JPH03609B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a film loading device for a camera.

In conventional cameras that use film cartridges, a rewind crank is often disposed on the top of the camera, and by pulling up the rewind crank, the back cover is unlocked and opened. In such cameras, film replacement is also performed with the rewind crank raised.

In recent years, cameras that are equipped with or have a built-in electric film rewind mechanism have been put into practical use, but since these are not equipped with a rewind crank, it is necessary to remove the rewind fork from the cartridge shaft when changing the film. A method of moving the rewinding fork in the axial direction in conjunction with the opening and closing of the back cover, or increasing the axial dimension of the cartridge chamber and providing a notch on the surface of the cartridge chamber facing the rewinding fork position to attach and remove the cartridge. Methods such as making it possible are used.

In the rewinding mechanism using the conventional method as described above, there is an absorption mechanism that moves the rewinding fork when the rewinding fork and the protrusions of the engaging part in the cartridge shaft collide with each other, and a mechanism that moves the rewinding fork ( A mechanism that absorbs the collision of the convex parts of the gear teeth when the disengaged gears re-mesh when one part of the gear train for driving the rewinding fork (for film exchange, etc.) becomes disengaged. It was essential to establish a Therefore, the provision of the above-mentioned absorption mechanism complicates the apparatus, and there are drawbacks such as the need to increase the axial dimension of the cartridge chamber. Another problem was that the operability for changing the film was poor.

The present invention has been made in view of the above circumstances, and includes a fork that engages with a film cartridge shaft, and a rotatably supported shaft for holding the fork and displacing the fork outside the cartridge storage chamber. a holding means, a first driving force delivery means rotatably supported coaxially with the rotation axis of the holding means and transmitting rotational driving force to the fork, and rotatably supported on the holding means; and a second driving force transmitting means for transmitting the rotational driving force from the first driving force transmitting means to the fork, the fork being displaced outside the cartridge storage chamber without disconnecting the power transmission system to the fork. It is an object of the present invention to provide a film loading device for a camera which greatly improves the mechanism and operability by loading the cartridge with the camera.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is an exploded perspective view showing an embodiment of a film rewinding device according to the present invention. In FIG. 1, 1 is a camera body, 1d is an aperture, and 1e is a guide rail. 2 is the back cover, 3 is the fork base plate,
The hole 3c is rotatably fitted into the shaft 1b inside the main body. 5 and 6 are holes 3a and 3b in the fork base plate
This is a fork drive gear whose respective shafts are rotatably fitted and supported in holes 4a and 4b of the holding plate 4. The gear 5 is integrally formed with a fork 5a that engages with the film cartridge shaft. Reference numeral 7 denotes a fork drive gear rotatably fitted onto a shaft coaxial with the hole 3c, and the driving force from a motor (not shown) is first transmitted to this gear. 8a is a fork base plate locking pawl provided on the back cover locking lever. The back cover locking lever 8 is urged upward by a spring (not shown), and the locking claw 8a falls into the hole 3e to lock the fork base plate 3 in the photographing and rewinding position. This mechanism is very similar to a known back cover locking mechanism, and is not particularly new, so it is not shown. The hole 2a provided in the back cover is for pressing the 3f portion of the fork base plate 3 to move the fork base plate 3 to the locking position, and is preferably made of an elastic material such as neoprene. 9 is the dowel 1c on the camera body 1 and the dowel 3d on the fork base plate 3
This is a coil spring that connects the fork base plate 3 and biases it in a direction to project the fork base plate 3 to the outside of the main body.

Figures 2 and 3 are cross-sectional views of the device shown in Figure 1, with Figure 2 showing the camera back in a closed position and the fork ready for shooting or rewinding; Indicates the fork position when the

The operation of the apparatus shown in FIG. 1 will be explained below with reference to FIGS. 2 and 3. In Fig. 2, the 3f portion of the fork base plate is pressed against the protrusion 2a of the back lid, and the light shielding wall 1f
The 3h portion of the fork base plate 3 is in contact with the fork base plate 3. As a result, the fork base plate 3 is firmly positioned and does not move even by the driving force from the rewind drive gear 10. A slight play is provided in the depression hole 3e of the locking pawl 8a, and 8a and 3e are not in contact with each other when pressed by the back cover. When locking the back cover and locking the fork base plate, the stroke is set such that the fork base plate>the back cover. Therefore, when the locking member 8 is pulled down against the biasing force of the spring by operating the back cover opening member, the back cover lock is first opened, and then the fork base plate is released. Then, the fork base plate 3 is rotated counterclockwise around the shaft 1b by the spring 9 without releasing the meshing between the gear 7, the gear 10, and the gears 6 and 5, and the positioning portion 3g is rotated against the light shielding wall 1f. Rotate until they touch. In this position,
Since a large portion of the cartridge is located outside the cartridge storage chamber, replacement is easy. This state is shown in FIG. To return the state shown in the third figure to the state shown in the second figure, you can simply close the back cover.
Even if you push the cartridge attached to the fork,
Alternatively, the fork base plate may be pushed in by hand. In either case, the fork base plate is first locked, then the projection 2a of the back cover is used to lock the back cover. During this time, the locking of the fork base plate is maintained.
At this time, play is required in the locking mechanism of the back cover, but this is absorbed by the elasticity of the protrusion 2a.

As explained in detail above, in the device of this embodiment, there is no need for a mechanism to absorb the vertical movement of the rewinding fork, and since the meshing of the drive gear is always maintained, an absorption mechanism for meshing is also required. Therefore, it is possible to construct a simple mechanism that pushes the cartridge out of the camera when changing the film. Therefore, the vertical dimension around the cartridge chamber can be minimized without impairing the operability of the camera, which is extremely effective in downsizing the camera.

In the above embodiments, the fork 5a corresponds to the fork of the present invention, the fork base plate 3 corresponds to the holding means of the present invention, the fork drive gear 7 corresponds to the first driving force transmission means of the present invention, and the fork The drive gears 5 and 6 correspond to the second drive force transmission means of the present invention.

As explained above, according to the present invention, the cartridge is loaded by displacing the fork outside the cartridge storage chamber without disconnecting the driving force transmission system to the fork. The mechanism and operability of the loading device can be greatly improved, and its effectiveness is extremely high.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of a film rewinding device according to the present invention, FIGS. 2 and 3 are sectional views of the device shown in FIG. 1, and FIG. In the possible position, FIG. 3 shows a state in which the back cover is opened. 1... Camera body, 2... Back cover, 3... Fork base plate, 4... Holding plate, 5a... Rewinding fork, 5, 6, 7, 10... Drive gear, 8... Back cover locking Lever, 9...Coil spring.

Claims (1)

[Claims] 1. A fork that engages with the film cartridge shaft, a holding means rotatably supported for holding the fork and displacing the fork outside the cartridge storage chamber, and a fork coaxial with the rotating shaft of the holding means. a first driving force transmitting means that is rotatably supported by the fork and transmits a rotational driving force to the fork; and a rotary driving force from the first driving force transmitting means that is rotatably supported by the holding means. and second driving force transmitting means for transmitting the driving force to the fork.