JPS6343458Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a film spool device for a camera, and more particularly, to a spool device for holding the leading end of a film when loading the film.

Spool devices that grip the leading end of the film include a conyl reel type in which the spool body has a double-tube structure and the leading end of the film is inserted between the inner and outer cylinders, and a spool device that has multiple notched grooves in the axial direction of the spool body. Multi-groove types are known.

However, with the former conile reel type, sufficient gripping force cannot be obtained at the beginning of film winding, and the tip of the inserted film tends to slip out. The tip of the inserted film protrudes to the back side of the spool through the notch on the back side, and the tip of the film slips out to the back side, causing
This has the disadvantage that the winding diameter of the film to be wound increases accordingly. Further, all of the recently developed film autoloading type spool devices have the drawbacks of complicated structures, large-scale devices, and high costs.

In view of the above points, the present invention has been developed to grip the film so that when the leading end of the film is inserted, it bites into the leading end and prevents the film from coming off, and this gripping of the film is linked to the pressing operation of the film rewind button. To provide a film spooling device for a camera which is adapted to be released.

According to the present invention, the leading end of the film is reliably gripped by just slightly inserting it, and the inserted leading end does not protrude to the back side of the spool, increasing the winding diameter of the film. Not at all.
Also, when rewinding the film, the film grip release member that operates in conjunction with the push-in of the film rewind button automatically releases the film grip, so there is no need to manually pull out the leading edge of the film from the spool. Therefore, it is possible to provide a film spooling device for a camera which has a simple structure and is extremely practical.

Hereinafter, the present invention will be explained based on the illustrated embodiments.

FIG. 1 is a perspective view of a spool in a film spool device showing an embodiment of the present invention, and FIGS. 2 and 3 are a longitudinal sectional view and a transverse sectional view of the spool. As shown in FIGS. 1 to 3 above, the spool 1 in this embodiment is made of a cylindrical body, and a pair of vertically long film insertion windows 5 are bored at symmetrical positions from the middle to the bottom of the spool 1. Spool body 2
, a two-release film holding plate 3 whose base is rotatably attached to the left and right edges of the insertion window 5 and which opens and closes the window 5 in the style of a double door, and a film holding plate 3 that moves forward and backward from below the spool body 2. The main part thereof is formed by a presser plate release member 4 which is freely inserted and opens the presser plate 3 to allow the leading end of the film to come in and out.

As shown in FIG. 3, the holding plate 3 has a wedge-shaped cross-section, and supports the upper and lower windows 5 of the spool body 2 by support pins 6 planted on the upper and lower surfaces of its base. It is pivoted to the left and right positions so that it can be opened and closed. The presser plate 3 is attached to the pin 6
An opening spring (not shown) is wound around the spool main body 2 and the holding plate 3 at both ends thereof.
However, the rotation due to the opening behavior is caused by the inward protruding pieces 7 provided integrally at the lower parts of the left and right presser plates, and the protrusion 10 of the presser plate release member 4, which will be described later. Under normal conditions, as shown in FIG. 3, the leading edges of the left and right holding plates 3 are in contact with each other to completely close the film insertion window 5. I am in a state.

The presser plate release member 4 is connected to the spool body 2.
It is formed of a short bottomed cylindrical body having an outer diameter equal to the inner diameter of the spool body 2, and vertically perforated holes are formed at symmetrical positions on the left and right outer circumferential surfaces of the spool body 2 at symmetrical positions on the lower inner circumferential surface of the spool body 2. A guide piece 9 that fits into the guide groove 8
is integrally formed and protrudes upward. A pair of protrusions 10 are provided at symmetrical positions on the upper end surface of the release member 4 facing the presser plate 3, the outer surface being an inclined surface 10a and the inner surface being a vertical surface. There is. The lower end portion of the protruding piece 7 of the presser plate 3 is engaged with this inclined surface 10a. Further, an elastic coil spring 12 is disposed between the bottom surface of the release member 4 and a horizontal frame portion 11 formed at the lower end of the spool body 2. 4 is the spool body 2
Although it is given the habit of moving downward against the ground, it is kept stationary at the position shown in FIGS. 1 and 2 by a stopper (not shown).

The spool 1 constructed in this way operates as follows. That is, when loading the film by inserting the leading end of the film into the spool 1 and gripping the leading end by the spool 1, as shown in FIG. , just insert the leading end of the film 13. At this time, since the outward rotational tendency of the presser plate 3 is provided by a weak spring, the film 13
It can be easily opened inward by inserting the holder, and insertion is extremely easy. On the other hand, when force is applied in the direction of pulling out the film 13, the tips of the left and right holding plates 3 take on a wedge shape and firmly bite into the tips of the film 13 to freely and securely grip it. Therefore, the leading end of the film 13 once inserted cannot be removed from the spool body 2 unless the presser plate release member 4 is operated.

Next, a description will be given of the operation of pulling out the film 13 from the spool 1 when the film 13 is rewound after the winding of the photographic film has been completed. In this case, the presser plate release member 4 is inserted into the spool body 2 and the coil spring 1 is inserted into the spool body 2.
When the release member 4 is pushed into the spool body 2, the outer inclined surface 10a of the protrusion 10 of the release member 4 causes the release member 4 to
The protruding piece 7 of the presser plate 3 is pushed outward, and the presser plate 3 integral with it is opened inward as shown in Figures 5 and 6. As a result, the grip of the leading end of the inserted film 12 is released,
The film 13 can be easily pulled out without any resistance.

Next, an example of the pushing mechanism of the device of the present invention for pushing the presser plate release member 4 in conjunction with pushing of the film rewind button of the camera will be explained with reference to FIG. The figure shows a state in which the release member 4 is not pushed in,
That is, this is a perspective view showing the push-in mechanism 14 in which the film rewind button 15 is not pushed in and the release member 4 is in the state shown in FIGS. 2 and 3. In the figure, the rewind button 15 is supported by a camera body (not shown) so as to be able to move up and down, and its lower end forms a pushing portion 15a that protrudes from the lower surface of the camera body. This film rewinding button 15 opens the film transport sprocket and the spool 1 when the pushing part 15a protruding downward is pushed in.
This is a commonly used and well-known device that releases the linkage with the sprocket wheel and frees the sprocket wheel. That is, a large-diameter portion 15b is formed at the upper end of the spindle 15c of the rewind button that extends into the camera, and the outer peripheral surface of the spindle 15c is rotatable in the vertical direction of the spindle 15c, that is, in a plane perpendicular to the spindle 15c. One side of the locking plate 17, which rotates clockwise by the opening spring 18, comes into contact with the locking plate 17. This locking plate 17 is
When the rewind button 15 is pushed in and the large diameter portion 15b moves upward and the sprocket wheel and spool are disengaged, the rewind button 15 is rotated until it comes into contact with the small diameter support shaft 15c of the rewind button 15 due to its rotational behavior. The lower surface of the large diameter portion 15b comes into contact with the upper surface of the locking plate 17, and the rewind button 15, which has a downward tendency, is temporarily restrained from descending. The locking plate 17 prevents the rewind button 15 from descending.When a film is loaded and the first film is wound up, the locking plate 17 moves counterclockwise in conjunction with the film winding mechanism. By rotating it, it is released and returns to the state shown in the figure.

In the present invention, a flange 16 is formed at the lower end of the narrow diameter support shaft 15c of the rewind button 15 configured as described above, and a release member for the spool 1 is formed on the upper surface of the flange 16. Push-up plate 1 that pushes up 4
One end of 9 is brought into contact with the other end. The push-up plate 19 has a semicircular plate-shaped upper protrusion 1 at its center.
9a comes into contact with the bottom surface of the release member 4, one end comes into contact with the top surface of the flange 16 of the rewind button 15, and the pin 20 is implanted at the other end.
It fits into a vertical guide groove (not shown) provided in the camera body, and is movable only in the vertical direction. Below the pin 20, the center portion is rotatably supported by a support shaft 22 in a plane orthogonal to the push-up plate 19, and one end extending in the horizontal direction is bent at a right angle. A deformable lever 21 is provided, which has a pushing part 21a that comes into contact with the lower surface of the lever, and a pushed part 21b that extends at a right angle in the opposite direction to the one end at the other end that extends downward in the center. has been done. A tensile coil spring 24 is applied to the pin 23 implanted in the protrusion 19a of the push-up plate 19 and the camera body, giving the push-up plate 19 the ability to move downward. However, the downward movement due to this habit causes one end to come into contact with the collar 16 of the rewind button and the other end of the pin 20 into contact with the push plate 21a of the deformation lever 21, as shown in FIG. It is regulated by. In addition, the deformation lever 21
The pushed part 21b faces a pushing plate (not shown) provided on the inner surface of the camera back cover (not shown), and when the back cover is closed, the pushed part 21b of the camera back moves. , the lever 21 rotates clockwise around the support shaft 22, and the pushing part 2 of the lever 21
1a to push up the pin 20 and open the back cover, the coil spring 2 of the push-up plate 19
4, the pushing portion 21a of the deformable lever 21 is pushed down via the pin 20.

Next, the operation of the pushing mechanism 14 configured in this way will be explained. FIG. 7 shows a state in which the back cover is closed and the film is wound up. In this state, the release member 4 of the spool 1
is in the lowered position shown in FIG.
As shown in FIG. 4, the distal end of the holder is firmly held by a presser plate 3. Shooting ends from this state, and the film is transferred to a cartridge (not shown).
When rewinding the rewind, push the pushing part 15a of the rewind button 15 upwards, and the push-up plate 19 will be
Since its one end is pushed up by the flange 16 of the rewind button 15, the push-up plate 19 rotates clockwise around the pin 20 implanted at the other end, and its projection 19a The above-mentioned release member 4
is pushed up, and the grip of the film 13 is released as shown in FIGS. 5 and 6. Therefore, the film 13 can be completely rewound into the film cartridge by the film rewind knob.

When the rewinding button 15 is pushed up, the locking plate 17 that was in contact with the large diameter portion 15b comes into contact with the small diameter support shaft 15c as described above, and the rewinding button 15 is moved by the plate 17 to unwind. Since the return button 15 is prevented from descending, there is no need to keep pressing it, and the film is maintained in the released state. When the film is completely wound into the cartridge by rewinding, and when the cartridge is taken out by opening the back cover, the deformable lever 21 is pressed against the pushed part 21b of the deformation lever 21, which has been pushed by the pushing part of the back cover. Since the pressing force is removed, the lever 21 is free to rotate counterclockwise, and the other end of the push-up plate 19, which had been prevented from descending via the pin 20 by the pushing portion 21a of the lever 21, The pin 20 is lowered until the pin 20 reaches the lower end of the guide groove (not shown). When the other end of the pusher plate 19 descends, the protrusion 19a also descends, and the release member 4 also descends, so the retainer plate 3 of the spool 1 is in the state shown in FIG. 4, and the film gripping force is reduced. Recover. Therefore, when a new film is loaded and its leading end is inserted between the holding plates 3 of the spool 1, the leading end is securely and firmly held by the holding plates 3. When the film whose tip is gripped is wound onto the spool 1 by a winding operation, the locking plate 17, which had been restraining the lowering of the rewind button 15, releases the opening spring 18 in conjunction with this winding operation. Since the rewind button 15 rotates counterclockwise against the elastic force, the rewind button 15 is lowered by the tensile elasticity of the coil spring 24, and the flange 16 of the button 15 is also lowered. One end of the push-up plate 19, which had been restrained, also lowers, so that the protrusion 19 of the push-up plate 19
a also descends to a position away from the bottom surface of the release member 4. However, 2 and 3 of the film leader section
When the back cover is closed after winding the film by aerial copying of the frame, the pushed part 21b of the deformation lever 21 is pressed by the pushing part of the back cover, as described above.
The lever 21 rotates clockwise, and its pushing portion 2
1a pushes up the pin 20 of the push-up plate 19 and raises the other end of the push-up plate 19, so that the protrusion 19a of the push-up plate 19 also rises accordingly.
The release member 4 returns to its position in contact with the bottom surface, that is, the state shown in FIG. 7. In this state, as described above, the leading end of the film is firmly held by the spool 1. If you want to rewind the film after shooting, press the rewind button 15, and as mentioned above, the spool 1 will release its grip on the leading end of the film, making it easy to rewind it into the cartridge. It can be returned. That is, the film is unlocked only when the camera back cover is closed and the rewind button 15 is pushed in.
In other cases, the film is gripped.

As explained above, according to the present invention, the intended purpose described at the beginning of the specification can be successfully achieved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a spool in a film spool device showing an embodiment of the present invention, FIG. 2 is a vertical sectional view of the spool shown in FIG.
The figure is a cross-sectional view of the spool along the line X-X in FIG. 2, FIGS. FIG. 7 is a perspective view showing the pushing mechanism of the presser plate release member of the spool shown in FIG. 1 above. 1...Spool, 3...Film holding plate, 4...
...Release member, 14...Release member pushing mechanism, 15...
...Rewind button.

Claims (1)

[Scope of Claim for Utility Model Registration] A film holding plate that bites into the leading edge of the film when it is inserted and holds the film so that it does not come off; and a release member that releases the film holding action of this holding plate. an operating member that operates the release member in the release direction in conjunction with the pushing operation of a film rewind button; and a regulating member that restricts the operation of the release member in conjunction with the opening of the rear cover of the camera; A film spool device for a camera, comprising: