JPH0750744Y2 - Spool for film unit with lens - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement of a film locking spool used in a photographic roll film, particularly a film unit with a lens.

[Conventional technology]

Recently, what is called a film unit with a lens or a disposable camera has come on the market. That is, it is a cartridge in which a film is attached with a lens so that the film can be photographed by feeding the film one by one, and the film unit itself constitutes a simple camera.

For this, a 135 type roll film is usually looking out from the patrone, the tongue of the film is inserted into the slit of the spool outside the patrone, and the spool is wound and the rear end of the film is placed inside the patrone. A film unit with a lens is used in which the cartridge is almost completely emptied while it remains locked firmly on the spool, and then stored in a cartridge with a lens.

Then, the film unit is fed frame by frame, and the film is photographed. When all frames have been photographed, the film wound on the spool outside the patrone is rewound into the patrone and sent to the photo lab. I am doing it. At the developing station, the film unit with the lens is broken, the cartridge is taken out from the inside, and the developing process is carried out by placing it on the ordinary 135 type film developing system.

Then, the spool 1 outside the cartridge is normally pressed onto the inner wall surface 7a of the slit 7 formed in the winding shaft 6 as shown in the front view of FIG. 7 and the AA sectional view of FIG. The pressing rib 8 is provided on the rib 9 and the other inner wall surface 7b.

Further, flanges 5 are provided on both sides of the winding shaft 6, and bosses 2, 3 and a drive transmission joint portion 4 are provided on the outside of the winding shaft 6 concentrically with each other.

[Problems to be solved by the device]

When the tongue at the tip of the film containing the cartridge is put in the slit 7 of the winding shaft 2 of the spool 1 in a wound state, the tongue should never come off the slit 7 at the initial stage of winding. If the winding is finished, the tongue piece must be completely removed from the slit 7 of the spool 1 and wound in the cartridge or on the verge of being wound.

That is, if the tongue slips out of the slit 7 when it is wound up, it will be a completely defective product and it will not be possible to shoot. If the tongue does not come off the slit after winding, the film unit will be broken and the inside cartridge will enter. When taking out the photographic film, the film that has already been taken will be pulled out from the patrone in a bright place, causing a light cast, and the crystals of the effort taken by the user will be worthless and useless.

That is, the condition required for the spool 1 is that the tongue piece is never disengaged at the beginning of winding, and the tongue piece can be easily disengaged from the slit in the exact opposite manner at the end of winding. is necessary.

However, the conventional spool has a problem in such a point, and there is no spool which always stably satisfies the above-mentioned conditions.

An object of the present invention is to provide a spool for a film unit with a lens, in which such problems are eliminated.

[Means for Solving the Problems]

For this purpose, a slit is provided on the winding shaft so that the film tongue can be inserted, and one inner wall surface of the slit is provided with a locking claw capable of locking the first perforation of the film tongue protruding from the cartridge. The present invention is achieved by a spool for a lens-equipped film unit, characterized in that a film pressing rib is provided on the inner wall surface and a locking claw capable of locking the second perforation of the film tongue is provided at a slit end portion in the film winding direction. .

〔Example〕

1 is a perspective view of FIG. 1, a front view of FIG.
3 is an enlarged view of a part of FIG. 2, FIG. 4 is a cross-sectional view taken along the line BB and DD of FIG. 2, and FIG. 5 is a cross-sectional view taken along the line CC of FIG. This will be described with reference to FIG. 6 showing the winding state in the case.

However, the present invention is not limited to this embodiment. In the figure, components having the same functions as those of the conventional example are designated by the same reference numerals.

The slit 7 of the spool 10 of the present invention is composed of one inner wall surface 7a, the other inner wall surface 7b parallel to it, and inner wall surfaces 7c and 7d on both sides perpendicular to the inner wall surface 7a. Has been. The inner wall surface 7a has locking claws 13 for locking the first perforations 21 of the film 20, and the inner wall surface 7b has locking ribs 11, 12 of the film and the second perforations 22 of the film 20. A locking claw 14 is provided. Further, the length between the inner wall surfaces 7c and 7d of the slit 7 is made substantially equal to the width of the end tongue piece 23 of the film 20. As a result, the first and second perforations have the locking claws.
Although it is more easily applied to 13,14, it is not limited to this. The engaging surface 13a of the locking claw 13 on the first film perforation 21 is the inner wall surface 7a or 7b.
To 55 ° to 65 °.

Further, the overlapping amount of the pressing ribs 11 and 12 and the locking claw 13 in the inner wall surface 7c or 7d direction is 0.4 to 0.6 mm. A flange 5, a boss 2, a boss 3, and a drive transmission joint portion 4 thereof are provided concentrically with the winding shaft 6.

When the tongue piece of the film is inserted into the slit 7 of the spool 10 and wound up, the force exerted by the engaging surface 13a of the first perforation 21 on the locking claw 13 and the pressing ribs 11 and 12 is suppressed. As a result, a stable locking force is generated, and when the winding is started, the locking claw 14 further applies the second perforation to increase the locking force to advance the winding.

Then, the winding operation is completed with the film in the cartridge removed. Of course, in this state, the end of the film is locked to the spool in the cartridge.
Then, in this state, the cartridge is shipped in a state where it is loaded in the cartridge of the film unit with lens.

When the film unit with the lens is photographed by the user or the like and the film is rolled up in the successive patrone and all the predetermined number of images have been photographed, the film is inserted into the slit 7 of the spool 10, the locking claws 13, 14 and the presser foot. The film tongue 23 locked by the ribs 11 and 12 is smoothly pulled out of the locking claw 13 while the first perforation 21 slides on the hooking surface 13a when the film 20 is pulled, and the second perforation 22 also moves. It comes out of the locking claw 14 without any resistance.

In this way, during film winding at the time of manufacturing the film unit with a lens, the locking to the spool 10 is stably held, and an accurate and highly reliable film unit with a lens is completed. Keeps shooting smoothly, and after the final shooting, the film tongue is surely disengaged from the spool 10 and wound into the cartridge, so the film that has already been shot unravels during the development preparation work in the lab. Such serious mistakes can be avoided.

[Effect of device]

The present invention ensures high reliability of film wrapping when manufacturing a film unit with a lens, avoids the creation of serious defects, and avoids accidents such as the film unraveling and causing fog. Became.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention. FIG. 2 is a front view of an embodiment of the present invention. FIG. 3 is an enlarged view of a portion a of FIG. FIG. 4 is a sectional view taken along the line BB or DD in FIG. FIG. 5 is a sectional view taken along line CC of FIG. FIG. 6 is a sectional view showing a film winding state according to one embodiment of the present invention. FIG. 7 is a front view of a conventional spool. FIG. 8 is a sectional view taken along the line AA in FIG. 6 …… Rolling shaft, 7 …… Slit 7a, 7b, 7c, 7d …… Inner wall surface 11,12 …… Pressing rib, 13,14 …… Locking claw 13a …… Hooking surface, 20 …… Film 21 …… First perforation 22 …… Second perforation 23 …… Tongue

Claims (2)

[Scope of utility model registration request] 1. A slit into which a film tongue can be inserted is provided on a winding shaft, and a locking claw capable of locking the first perforation of the film tongue, which usually projects from the cartridge, is provided on one inner wall surface of the slit, and the other. 2. A spool for a film-equipped film unit with a lens, comprising: a film pressing rib on the inner wall surface of the film; and a locking claw capable of locking the second perforation of the film tongue at the slit end in the film winding direction. 2. The angle of the locking claw of the first perforation is 55 to 65 ° with respect to the other inner wall surface of the slit, and the overlapping amount of the locking claw and the pressing rib is 0.4 to 0.6 mm. A spool for a film-equipped film unit according to claim 1, wherein: