JPS5845698B2 - film storage box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a film storage box for permanently storing raw film for X-ray photography, exposed film, or sheet-like film such as photographic paper.

Generally, in an X-ray imaging apparatus, it is difficult to develop the exposed film each time, so it is necessary to temporarily store the exposed film.

Film storage boxes used for this purpose include:
There is a so-called stack type in which films are accommodated in a stacked state, and a so-called winding type in which a plurality of films are placed adjacent to each other in the length direction of a strip base and the strip base is wound around a winding core (for example, the winding type in which films are stored in a stacked state). 47-4329).

In the past, roll-up type devices have been increasingly used because of the advantages of ensuring reliable film storage and supply to the developing device, and of being able to store films of different sizes without distinction.

However, conventional winding-type film storage boxes do not allow the film to be wound around a winding core (drum) together with a wide long strip base, as shown in, for example, Japanese Patent Application Laid-Open No. 47-4329. Because of its structure, when using extremely thin plate-making film or thin photographic paper for phototypesetting with curls, it may stick tightly to the strip base, making it difficult to remove the film.

According to such a structure, if the film is wound to one side of the winding core, the tension applied to the strip base becomes uneven, which not only causes structural stress.
Because the holding force against the small-sized film held on the other side was weak, the film sometimes fell off or tilted and could not be taken out.

In order to eliminate these drawbacks of conventional roll-up film storage boxes, the band-shaped base was replaced with a narrow base with multiple strips.
By simply winding up these narrow bases with a plurality of winding cores, the film and the base can be easily separated.

However, in such a structure, the winding diameter is different between the base that winds the film and the other bases, so some of the bases may sag, or the winding shaft may become loose due to the continuous rotational movement of the original winding shaft. (Because some of the bases that have been wound are unwound to the core of the original winding shaft (in the opposite direction), it was impossible to achieve this by simply using a plurality of narrow bases.

The present invention is a roll-up type film storage box that can eliminate the drawbacks of the film storage box that uses a single wide base as described above, is mechanically reasonable, and does not cause reverse winding or sagging of the base. We are proposing a film storage box.

Hereinafter, details of one embodiment of the present invention shown in the drawings will be described.

FIG. 1 is a partially cut away overall view of a film storage box according to the present invention, which is equipped with a dark box or storage box 2 having a slit-like intake port 1 formed therein.

The intake port 1 through which film is taken in and taken out is optically shielded by a shutter plate 4 that is biased in the closing direction by a spring 3. It can be opened by pushing the knob 5 forward.

A U-shaped frame 6 is positioned in the storage box 2, and a frame 6 is driven in the directions of arrows A and B by a motor or the like as necessary between opposing side walls 5a + 5b. A source winding shaft 7 and a winding shaft 8 are installed.

The original winding shaft 7 and the winding shaft 8, which are parallel to each other, are subjected to a frictional braking force against the frame 6 so as to prevent free rotational movement and keep the base (described later) under constant tension.

That is, grooves 9 are formed at the shaft ends of the original winding shaft 7 and the winding shaft 8.
, 10 are formed, and a friction plate 11,12 which can move along these grooves 9, 10 and is prevented from moving in the direction of rotation with respect to the shaft to which it is attached is loosely fitted onto the source winding shaft 7 and the winding shaft 8.

These friction plates 11 and 12 are formed integrally with the frame 6 by compression springs 15 and 16 interposed between them and stoppers 13 and 14 on the corresponding shafts.
7,184 pieces are pressure-welded.

The source winding shaft 7 and the winding shaft 8 have a plurality of source winding cores 19 and take-up cores 20 adjacent to each other in their length direction.
are located respectively.

The original winding core 19 and the winding core 20 have the same structure except for the claws, which will be described in detail later. The core 20 is an insert 2 fixed to the winding shaft 8
0a, and a hollow core body 20b that accommodates the insert 20a, and the core body 20b can freely rotate with respect to the winding shaft 8.

The insert 20a has four elastic arms 20c integrally molded, and the tips of these elastic arms 20c are elastically engaged with the cylindrical inner peripheral surface 20d of the core body 20b. A friction shoe 20e is supported.

The frictional resistance between the core body 20b and the insert 20a is determined so that the sum of the frictional resistances of all the winding cores 20 is sufficiently greater than the braking resistance against the original winding shaft 7.

Further, the frictional resistance of the original winding core 19 obtained with the same structure as the winding core 20 is determined so that the sum of the frictional resistances of all the original winding cores 19 is sufficiently greater than the braking resistance against the winding shaft 8. It will be done.

Furthermore, in the illustrated embodiment, the frictional resistance of the winding core 20 is selected to be greater than the frictional resistance of the original winding core 19.

A recess 21 having an arcuate cross section is formed in the outer circumferential surface of the core body 20b of the winding core 20, and a claw 23 supported by a shaft 22 in a freely tiltable manner is positioned in the recess 21. There is.

This claw 23 is given a tendency to project out of the recess 21 by a biasing spring 24 interposed between the claw 23 and the bottom surface of the gap 21 .

Returning to FIGS. 1 to 3, the distance between the source winding core 19 and the winding core 20 is such that both ends are connected to the corresponding source winding core 1.
9 and a winding core 20 & a plurality of elongated bases 25 made of Mylar paper or the like are wound.

The middle part of these long bases 25 is connected to the intake port 1/Ic.
It is hung on a plurality of pulleys 27 that are freely rotatably supported on the nearest support shaft 26.

A plurality of guide plates 28 are positioned between the pulleys 27 on the support shaft 26, and these guide plates 28 guide the film when loading and unloading the film to the base 25.
It acts to facilitate the reception and separation of the film from the film.

Further, two support rods 29 are installed above the winding shaft 8, and these support rods 29 are engaged with the elongated holes 31 of a plurality of follower prevention members 30 corresponding to the winding core 20. Ru.

These anti-following members 30 have a tendency to move downward due to gravity, and their tips 30a lightly touch the surface of the corresponding winding core 20, but depending on design considerations, a biasing spring or the like may be used to provide the movement tendency. .

Incidentally, it is preferable to provide a plurality of limit switches 32 and 33 as shown in the figure facing each source winding core 19 and winding core 20.

That is, if the limit switch 32 detects the remaining base amount of the source winding core 19, a warning signal can be sent when the remaining amount becomes low, and the limit switch 33 detects the base amount of the take-up core 20. By setting the film to the maximum diameter, you will know that there is no room left to store the film.

Since the film storage box according to the embodiment has the above structure, as shown in FIG. 3, by rotating the winding shaft 8 in the direction of the arrow A while supplying the film The film X is mounted on the winding shaft 8I together with the base 25.
Ic is wound up.

In this case, in the case of a wide film, the winding diameters of all the winding cores 20 are the same, so the original winding core 19 rotates integrally with the original winding shaft 7.

When storing a small-sized film, some of the bases 25 are not related to film winding, so some of the bases 25 are not related to film winding compared to other winding cores 20. The diameter becomes relatively small.

Therefore, when the winding operation is performed with different winding diameters, the base 25, which is related to the winding of a large number of films, is wound onto the winding core 20 first.

Of course, when the remaining amount of the base of the original winding core 19 that has fallen down becomes small, this condition is detected by the limit switch 32 and the rotational movement of the winding shaft 8 is stopped.

Therefore, in the film storage state, a large amount of the base 25 remains in the original core 19, which has a small proportion involved in winding the film.

Therefore, when the original winding shaft 7 is rotated in the direction of arrow B as shown in the second figure to take out the film X, a large amount of the base 2
The winding core 20 corresponding to the original winding core 19 left by No. 5
Therefore, the base 25 is rewound quickly.

As a result, when the base 25 disappears from any of the winding cores 20, the claw 23 that was held down by the base 25 moves into the recess 2.
1, and the tip of this claw 23 is restrained by the tip 30a of the follower prevention member 30.

Therefore, in the winding core 20, the insert 20a and the core body 20 are separated by the restraining force of the follower prevention member 30.
During step b, the base 25 corresponding to the other winding core 20 is continuously pulled, and the films are sequentially taken out.

In other words, when all the bases 25 are rewound to the original winding core 20, the pawl 23 of each winding core 20 is restrained by the tip 30a of the follower prevention member 30, and the initial state shown in FIG. 3 is obtained. That's why.

In addition, in the above embodiment, the winding core is provided with a pawl and a following prevention member, but if necessary, it may be modified so that a pawl and a following prevention member are provided on the original winding core. In the case of a belt-like belt, claws and anti-following members may be provided on the take-up core and the original winding core.

As is clear from the above description, according to the present invention, since a plurality of strip-shaped bases are used, the rate of damage to the stored film is small, and the film can be reliably separated from the base.

In the film storage box of the present invention, since each base is kept under tension, films of different sizes can be handled without distinction, and the winding core may have different winding diameters while the film is being stored. However, there are advantages in that reverse winding and loosening of the belt can be prevented by the action of the pawl and the follower prevention member.

[Brief explanation of drawings]

Fig. 1 is an overall perspective view of the film storage box according to the present invention with a portion cut away, Fig. 2 is a sectional view of the film storage box in its initial state, and Fig. 3 is a sectional view of the film storage box in the film storage state. 4 is an enlarged exploded perspective view of the winding core, and FIG. 5 is a sectional view of the winding core. X...Film, 1...Intake port, 2.
...Storage box, 7...Main roll shaft, 8...
... Winding shaft, 11.12 ... Friction plate, 19 ...
...Material winding core, 20... Winding core 23
...Claw, 25...Base, 30...
...Following prevention member.

Claims (1)

[Claims] 1 A source winding shaft and a take-up shaft that are parallel to each other and are supported in a storage box with a frictional braking force, and a source winding shaft and a take-up shaft that are supported adjacent to each other in the length direction, respectively. and a plurality of source winding cores and a plurality of winding nears frictionally coupled to the shafts to be attached, both ends of which are fixed to the corresponding source winding cores and the winding core, and an intermediate portion provided at the intake port of the storage box. A strip base with multiple strips hung on a pulley,
at least one pawl located within a recess in the circumferential surface of the source core or the take-up core and having a tendency to protrude outside the recess, and in contact with the circumferential surface of the source core or the take-up core; and at least one anti-following member which restrains the pawl and prevents rotational movement of the corresponding core when the pawl protrudes outside the recess.