JPH0635120A - Photographic film cartridge - Google Patents

Abstract

PURPOSE:To obtain a photographic film cartridge capable of preventing the emulsion surface of a photographic film from being damaged. CONSTITUTION:When a spool 4 is rotated clockwise, the leading edge of the photographic film 3 abuts on a separation pawl 9 and the film 3 is separated from a photographic film roll 3a. Besides, it is guided to a photographic film path 7. Then, the leading edge of the film 3 abuts on a first light shielding member 11. However, since the shielding member 11 is smoothed, the film 3 is surely and smoothly ejected from a photographic film entrance and exit port 6. At this time, since the film 3 is pressed to the shielding member 11 side by a second light shielding member 12, the light shielding property of the port 6 is secured. Since the film 3 is fed, the winding diameter of the film 3 is made small and the film 3 approaches the pawl 9. However, since the height of a first wall surface 7a is set to a proper value, the emulsion surface of the film 3 is not brought into contact with the pawl 9 even when the film 3 is fed to the end.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic film cartridge in which a photographic film is housed in a roll and the spool is rotated to take the photographic film in and out.

[0002]

2. Description of the Related Art As known from, for example, U.S. Pat. Nos. 4,634,306 and 4,832,275, in the unused state, the tip of the photographic film is wound up in the main body of the cartridge, and the spool is rotated during use. Proposes a photo film patrone which is designed to send out a photo film from a photo film entrance / exit. When the spool is rotated, the photographic film roll is integrally rotated with the spool without being loosened by the ribs provided on the peripheral wall surface in the cartridge body. When the leading edge of the photographic film comes into contact with the separating claw, it is separated from the lower photographic film roll, guided to the photographic film passage, and discharged from the photographic film entrance / exit.

[0003]

However, in the above-mentioned photographic film cartridge, there is a teremp attached to the upper and lower walls of the photographic film passage for light shielding, especially a photographic film curled on the emulsion side of the photographic film. The tip was apt to be caught, and this sometimes resulted in poor cueing. In order to prevent this, it is conceivable to make the embossment on the emulsion side of the photographic film smooth and reduce the step between the separating claw and the teremp. In addition to being insufficient, the emulsion surface of the photographic film may come into contact with the separating nail and be damaged when the photographic film is fed during the shooting or when the photographic film is rewound after the shooting. Further, this may scrape the emulsion or anti-emulsion surface to generate dusts, which may adhere to the photographic film surface to cause defective development.

The present invention has been made in consideration of the above circumstances, and enables reliable cueing without sacrificing the light-shielding property of the entrance and exit of the photographic film, and the photographic film is fed and rewound. It is an object of the present invention to provide a photographic film cartridge in which the emulsion surface of the photographic film is prevented from being damaged when it is opened.

[0005]

In order to achieve the above object, the present invention provides a smooth first light shielding member on the first wall surface of a photographic film passage facing the emulsion surface of the photographic film, and A second light-shielding member having elasticity is provided on the second wall surface facing the emulsion surface, and a photographic film is provided on the separation claw which is provided at the back of the first wall and scoops the leading edge of the photographic film in a state where the photographic film is most fed out. The height of the first wall surface is set so as not to contact with each other.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a cartridge main body 2 of a photographic film cartridge is composed of upper and lower cases 2a and 2b each made of plastic. A spool 4 having a photographic film 3 wound in a roll shape is rotatably accommodated in the cartridge main body 2. Upper / lower case 2
Ribs 5 are formed integrally on the inner peripheral wall surfaces of a and 2b so as to contact the outer peripheral surface of the photographic film 3 wound on the spool 4 and prevent the photographic film 3 from being loosened.

At the joint between the upper and lower cases 2a and 2b,
Photo film entrance / exit 6 for photo film 3
Is formed. Behind this, there is a photographic film passage 7 constituted by a lower first wall surface 7a and an upper second wall surface 7b.
Further, a separating claw 9 for separating the leading end of the photographic film 3 from the lower photographic film roll 3a is formed at the end of the first wall surface 7a.

The first wall surface 7a has a smooth first light blocking member 11, and the second wall surface 7b has an elastic second light blocking member 12.
Are attached respectively. The leading edge of the photographic film 3 separated by the separating claw 9 is curled with a curl having the emulsion surface 3b side as the inner side, and while the spool 4 rotates, it slides on the surface of the first light shielding member 11. Proceed through the photo film passage 7. At this time, the elasticity of the second light shielding member 12 presses the photographic film 3 toward the first light shielding member 11, so that the light shielding property of the photographic film entrance / exit 6 is sufficiently secured.

The height of the first wall surface 7a is set so that the emulsion surface of the photographic film 3 (the lower surface of the drawing) does not come into contact with the separating claw 9 when the photographic film 3 is pulled out to the end. ing. That is, the upper surface (A
When a tangent drawn from _a point) on the surface of the spool 4 (contact = A ₂ points) and A ₁ A _2, with respect to the tangential line A ₁ A _2, when the separation claw 9 allowed to face each other apart clearance C ,
Since the photographic film 3 once picked up by the separating claw 9 does not come down below the tangent line A ₁ A ₂ , the emulsion surface of the photographic film 3 never contacts the separating claw 9 or the first wall surface 7a. .

The first light shielding member 11 has, for example, a thickness of 0.
It is formed from a 22 mm polyester divided ultrafine (0.2d) woven fabric, and this epidermis is fluffed. Further, as a means for attaching the first light shielding member 11 to the first wall surface 7a,
Double-sided tape such as Sony Chemical NP305B was used.

In the first embodiment, the second light shielding member 12 is formed of the following pile fabric. The warp of the base cloth is 120 denier / 25 filament Kuraray viscose rayon yarn, and the weft of the base cloth is 150 denier / 30
The filament is Kuraray viscose rayon yarn and the pile yarn is 100 denier / 48 filament Toray nylon 66 yarn and is woven with a twill weave V hanging method to a width of 5.0 mm and a width of the pile portion of 3.5 mm. It was The warp density is 40 threads / cm, the weft density is 4
The number was 0 / cm and the pile density was 38,000 / cm ² . This cloth was cut to a height of 2.0 mm with a shearing machine, and this was dyed with a Wins type dyeing machine to Mitsui Nylon Black SGL6.
% OWF was dyed in black and further coated with a sealing material / adhesive. The second light shielding member 12 thus formed was attached to the second wall surface 7b with a heating sealer.

In the second embodiment, the first light blocking member 11 is the same as in the first embodiment, and the second light blocking member 12 is formed of the following pile knitted fabric. The base cloth is a chain yarn made of Toyobo 709 polyester with 30 denier / 18 filaments × 2,
30 denier / 18 filament Toyobo 709 polyester insert yarn, 50 denier / 36 filament Toyobo 647 polyester and 75 denier / 2
Using a 4-filament Kuraray-made 7524551P polyester pile yarn and knitting with a double Russell machine to a width of 5.0 mm. The knitting width of the pile portion was 3.5 mm. Also,
The course implant density was 30 lines / cm, the well implant density was 10 lines / cm, and the pile density was 40,000 lines / cm ² . This cloth was cut to a height of 2.0 mm with a shearing machine and sanded with a high-pressure jet dyeing machine CS-2,7% OW
It was dyed black. Since the subsequent steps are the same as those in the first embodiment, the description thereof will be omitted.

In the third embodiment, the first light shielding member 11 is the same as in the first embodiment, and the second light shielding member 12 is formed of the following pile fabric. The warp yarn of the base cloth is Toray antistatic nylon parel yarn of 50 denier / 30 filament, the weft yarn of the base fabric is 70 denier / 24 filament Toray antistatic nylon parel yarn, and the pile yarn is 100 denier / 48 filament Toray. Made of Promilan T8100 nylon thread,
A plain weave pile V hanging method was used to weave a width of 5.0 mm and a pile width of 3.5 mm. The warp density is 50
The number of yarns / cm, the shot density of wefts were 24 yarns / cm, and the pile density was 58,000 yarns / cm ² . Since the subsequent steps are the same as those in the first embodiment, the description thereof will be omitted.

As shown in FIG. 2, the photographic film cartridge of Example 4 has the second wall surface 14 of the photographic film passage 14.
The first light shielding member 11 attached to b is the same as that of the first embodiment, but the second light shielding member 18 including the base member 16 and the skin 17 is attached to the first wall surface 14a. The base member 16 is made of Bridgestone's ester polyurethane high density (60 kg
/ m ^3, thickness 0.22 mm) sponge, skin 17 were formed from fluff out the polyester divided ultrafine system thickness 0.22 mm (0.2d) fabric. This skin 17 is attached to the surface of the base member 16 by frame lamination, and 30 mm ×
The second light blocking member 18 was cut into 6 mm. The second light shielding member 18 deforms the back side of the cartridge main body 2 flat with an ultrasonic horn so that the front end of the photographic film 3 is not caught on the end of the second light shielding member 18 when the front end of the photographic film 3 is fed out. The double-sided tape (Sony Chemical NP305B) shown in Example 1 was attached to the first wall surface 14a. In addition,
Also in this Example 4, the height of the first wall surface 14a is set in the same manner as in Example 1, and even when the photographic film 3 is fed to the end, the emulsion surface 3b of the photographic film 3 is set.
Does not contact the separating claw 19.

As shown in FIG. 3, the photographic film cartridge of Comparative Example 1 has the first wall surface 21 of the photographic film passage 21.
The height a is lower than that in Example 1, and the emulsion surface 3b of the photographic film 3 contacts the separating claw 22. The first light blocking members 11 and 12 similar to those of the first embodiment are attached to the first wall surface 21a and the second wall surface 21b.

For each of the photographic film cartridges of Examples 1 to 4 and Comparative Example 1 described above, the resin scraping amount (m
Table 1 below shows the results of tests conducted on g), the presence or absence of scratches during printing, the feeding torque (gcm), and the cue rate (%). The "resin scraping amount" is a value obtained by feeding the photographic film 100 times with a back tension of 200 g and measuring the difference in weight of the photographic film before and after rewinding. "Presence of scratches when printing"
After sending out the photographic film 100 times and rewinding it,
This is the presence or absence of scratches that are found by developing and printing this and visually observing this photographic print. "Feeding torque" is
The torque applied to the spool when the photo film was fed was measured with a torque meter. "Cue rate"
Is the percentage of the number of the 50 photo film cartridges in which the leading end of the photo film is projected from the photo film entrance / exit by spool rotation.

[0017]

[Table 1]

The symbols ◎, ○, ● and × in Table 1 indicate “very excellent”, “excellent”, “practical limit” and “unusable”, respectively. As is clear from Table 1, in each of Examples 1 to 4, the photographic film was not scratched, and there was no problem in the feeding torque and the indexing rate, and it was found to be very excellent.

[0019]

As described above, according to the photographic film cartridge of the present invention, a smooth first light shielding member is provided on the first wall surface of the photographic film passage facing the emulsion side of the photographic film. Since the second light-shielding member having elasticity is provided on the second wall surface facing the anti-emulsion surface of No. 3, reliable cueing can be performed without sacrificing the light-shielding property of the entrance and exit of the photographic film. In addition, the height of the wall of the photographic film passage is regulated so that the emulsion surface of the photographic film does not come into contact with the separating claws even when the photographic film is fully pulled out from the cartridge body. It can prevent the surface from being scratched. As a result, the shavings of the photographic film do not come out, so that defective development does not occur and the print image quality is improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a photographic film cartridge according to the present invention.

FIG. 2 is a cross-sectional view of a main part of a photographic film cartridge using sponge as a material of a light-shielding member having elasticity.

FIG. 3 is a cross-sectional view of a main part of a photographic film cartridge of a comparative example.

[Explanation of symbols]

 2 Patrone body 3 Photo film 3a Photo film roll 3b Emulsion surface 4 Spool 6 Photo film entrance / exit 7, 14, 21 Photo film passage 7a, 14a, 21a 1st wall surface 7b, 14b, 21b 2nd wall surface 9, 19 Separation claw 11th 1 Shading member 12, 18 2nd shading member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Takahashi 210 Nakanishuma, Minamiashigara City, Kanagawa Prefecture Fuji Photo Film Co., Ltd.

Claims (1)

[Claims] 1. A spool in which a photographic film is wound in a roll shape is rotatably housed in a cartridge body, and the tip of the photographic film is sent out from the photographic film entrance / exit through a photographic film passage provided in the cartridge body by the rotation of the spool. In the photographic film cartridge as described above, the photographic film passage comprises a first wall surface facing the emulsion surface of the photographic film and a second wall surface facing the anti-emulsion surface of the photographic film, and the first wall surface is smooth. The first light blocking member is provided, and the second light blocking member having elasticity is provided on the second wall surface.
A photographic film cartridge wherein the height of the first wall is set so that the photographic film does not come into contact with a separating claw provided at the back of the wall and scooping the tip of the photographic film.