JP2771357B2 - Photo film patrone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a tongue-shaped projection formed on a disk provided at each end of a spool. The projection partially covers the photographic film wound on the spool from both ends. The present invention relates to a photographic film patrone which prevents the loosening of the film and deforms the projections at the entrance and exit of the photographic film to feed the photographic film.

[0002]

2. Description of the Related Art A photographic film cartridge disclosed in U.S. Pat. No. 4,834,306 has a spool in which a photographic film is wound and discs are fitted to both ends of the spool, and a tongue-shaped projection integrally formed around the periphery of the disc. The outermost periphery of the photo film wound around the photo film is partially wrapped from both sides to prevent the photo film from becoming loose. Thus, when the spool is rotated in the direction in which the photo film is fed, the photo film rotates together with the spool without being loosened. Further, the projection is spread in the width direction of the photo film by an expanding projection provided on the inner wall of the cartridge body in the vicinity of the photo film entrance provided in the cartridge body, and the photo film is led out toward the photo film entrance from there between. It has a structure. Therefore, when the photo film is not used, even if the front end of the photo film is wound in the cartridge body, the front end of the photo film can be sent out by rotating the spool.

[0003]

In the case of the above-mentioned photographic film cartridge, it is necessary to form the disk with a flexible material in order to smoothly feed the photographic film by rotating the spool. However, if the disk with the projections is made too flexible, the effect of restricting the loosening of the photo film is inevitably weakened, causing inconveniences such as the photo film overflowing out of the projections and being sharply bent. As a result, the rotation of the spool is hindered and the leading end of the photographic film cannot be fed. Conversely, if the disc is low in flexibility (high in rigidity), the disc cannot be fed out without being bent and spread by the photo film,
The frictional resistance between the side of the disk and both ends in the width direction of the photographic film increases, and the torque required for feeding the photographic film increases.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem. A disk having a sufficient effect of preventing loosening of a photographic film and capable of reliably feeding the photographic film with a low feeding torque is provided. An object of the present invention is to provide a photographic film cartridge provided with the photographic film.

[0005]

According to the present invention, in order to achieve the above-mentioned object, a disk having a projection on a peripheral edge thereof for preventing winding of a photographic film is formed from a resin containing rubber.
At the same time, the prescribed value of the bending elasticity of the disk is 11 g or more and less than 130 g.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, the patrone main body 1 is composed of two parts, an upper case 1a and a lower case 1b. Then, the rear end of the photographic film 2 is fixed to the spool 3, and the photographic film 2 is stored in the cartridge body 1 in a state of being wound around the spool 3. Port portions 4a and 4b are integrally formed in the upper case 1a and the lower case 1b, and an opening formed at the joint thereof serves as a photographic film entrance 4 when the photographic film 2 is taken in and out. Upper case 1a, lower case 1
Exposed openings 5a and 5b of the spool shaft end 3a are open on both sides or one side of the side surface of b, and when they are integrally joined, a circular shaft opening 5 is formed at the joint. An arc-shaped rib 6 protruding inward along the outer circumference of the disk 7 is provided on the inner side wall of each of the cases 1a and 1b.
a, 6b are formed.

Steps are provided at both ends of the spool 3, and discs 7, 7 are loosely fitted to the outside thereof. Annular projections 7a are formed integrally with the disks 7, 7 along their outer peripheral edges to prevent loosening of the photographic film 2. As described above, the ribs 6a, 6b formed on the inner walls of the side surfaces of the upper and lower cases 1a, 1b are positioned so that the disks 7, 7 do not move in the axial direction of the spool 3. Further, these ribs 6a and 6b are not provided in portions near the port portions 4a and 4b. A distal end separation claw 9 is provided at the back of the port portion of the lower case 1b. When the photo film 2 rotates with the rotation of the spool 3, the tip separation claw 9 scoops up the photo film tip 2a and guides it to the port. Note that a light-shielding telem 15 is attached to the inner walls of the ports 4a and 4b.
The illustration is omitted.

The disk 7 is made of, for example, polypropylene (P
P), polyethylene (PE), polystyrene (PS),
Polycarbonate (PC), polyvinyl chloride (PVC)
As shown in FIGS. 3A and 3B, for example, the diameter D _{1 is set} to 21.2 mm and the inner diameter D ₂ is set by a molding method such as injection molding, vacuum molding, cold molding or the like. 8.2 mm,
Height D ₃ 1.8 millimeter of the projection 7a, the thickness of the projections 7a D ₄
Was molded to a size of 0.8 mm. Then, as shown in FIG. 4, a prescribed bending elasticity value b (g) indicating flexibility was measured for each disk 7 using a compression tester 16.
In this measuring method, a part of the disk 7 is fixed by sandwiching it between fixing jigs 17 and 18, and D ₅ (for example, 1
0 mm) above the projection 7a of the unfixed portion protruding by 25 mm.
The head 19 is lowered at a speed of mm / min and a stroke of D ₆ (for example, 2 mm) to bend the unfixed portion of the disk 7. At this time, the prescribed bending elasticity value b of the disk 7 can be known from the resistance value from the projection 7a on the head 19 at this time.

The following Table 1 shows the prescribed bending elasticity values b of the disks formed of various materials and thicknesses (mm).

[0010]

[Table 1]

Each of the discs having the levels A to O shown in Table 1 above was incorporated into the patrone main body 1, and the torque (g · cm) required for feeding (fronting) the front end portion 2a of the photographic film was measured. I got a graph like this. As a result,
When the prescribed bending elasticity value b of the disk was 10 g or less and 130 g or more, the cueing of the photographic film was poor. Therefore,
In order to perform the cueing of the photographic film satisfactorily, the prescribed value of the bending elasticity of the disc should be 11 g or more and less than 130 g.
Further, considering the consumption of the power supply battery of the camera, it can be seen that the prescribed bending elasticity value b should preferably be 15 g to 70 g, particularly preferably 20 g to 50 g.

The operation of the embodiment configured as described above will be described. When the photographic film 2 is completely wound in the patrone main body 1, the projection 7a formed on the disk 7 partially wraps the outermost side edge of the photographic film 2, and the photographic film 2 becomes loose. Is regulated. Then, when the spool 3 is rotated in the photo film feeding direction, the photo film 2 starts to rotate together with the spool 3.
When the front end 2a of the photographic film moves to the port portion 4b, it is scooped up by the front end separation claw 9 and guided to the entrance / exit 4 of the photographic film. When the spool 3 continues to rotate, the photo film 2 pushes out the projection 7a at its side edge as shown in FIG. 2, and the ribs 6a, 6b
Therefore, the disk 7 is sent out from the photographic film entrance 4 while the disk 7 is curved and deformed outward.

Next, the composition of the main members of the photographic film cartridge of the present invention will be described. First, spool 3
As the material for, a thermoplastic resin, a thermosetting resin group, a metal, a ceramic, or the like can be used, but a resin material is preferable in terms of suitability for mass production, price, and the like. Spool 3
As a resin composition, a light-shielding substance (to be described in detail later)
Polystyrene resin (including high-impact polystyrene resin with rubber), ABS resin, polyolefin resin (high-density polyethylene resin, homopolypropylene resin,
Thermoplastic resins such as propylene / α-olefin random copolymer resin and propylene / α-olefin block copolymer resin) are preferable because they can be injection-molded and are inexpensive.

In particular, high impact polystyrene resin and various polypropylene resins (homopolypropylene resin, propylene / ethylene random copolymer resin, propylene /
It is preferable to use a thermoplastic resin containing, as a main component, two or more blended resins of ethylene block copolymer resin), various polypropylene resins, ethylene copolymer resin and rubber, and at least the above-mentioned light-shielding substance. Although the preferred resin composition of the spool 3 has been described above, in the present invention, any resin can be used without particular limitation as long as it is a thermoplastic resin that can be injection molded.

Next, in order to enhance various characteristics of each member of the photographic film patrone of the present invention, it is preferable to add appropriate additives, respectively, examples of which are described below. It is preferable to add a conductive substance to the spool 3 in order to prevent an electrostatic failure of the photographic film.
Representative examples of this conductive substance are shown below.

(1) Nonionic surfactant Representative examples are shown below. Polyethylene glycol fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene fatty alcohol ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene glycerin fatty acid ester, polyoxyethylene fatty amine, sorbitan monofatty acid ester, fatty acid pentaerythritol ,

Fatty alcohol ethylene oxide adducts, fatty acid ethylene oxide adducts, fatty acid amino or fatty acid amide ethylene oxide adducts, alkylphenol ethylene oxide adducts, alkyl naphthol ethylene oxide adducts, partial polyhydric alcohols Ethylene oxide adducts of fatty acid esters and various nonionic antistatic agents described on page 120 of JP-B-63-26697.

(2) Anionic surfactant Representative examples are shown below. Ricinoleic acid sulfate soda salt, various fatty acid metal salts, ricinoleic acid ester sulfate soda salt, sulfated ethyl aniline sulfate,
Olefin sulfate, oleyl alcohol sulfate soda, alkyl sulfate, fatty acid ethyl sulfonate, alkyl sulfonate, alkyl naphthalene sulfonate, alkyl benzene sulfonate, succinate sulfonate, phosphate ester Salt and the like.

(3) Cationic surfactant Representative examples are shown below. Primary amine salts, tertiary amine salts, quaternary ammonium salts, pyridine derivatives and the like. (4) Amphoteric surfactant Representative examples are shown below. Carboxylic acid derivatives, imidazoline derivatives, betaine derivatives and the like.

(5) Alkylamine derivative (6) Fatty acid derivative (7) Various lubricants (8) Carbon black, graphite (9) Metallic surface pigment (10) Metal powder, metal flake (11) Carbon fiber (12) Metal fiber (13) Whisker (potassium titanate, alumina nitride,
Alumina) It is preferable to add 0.01 to 3.0% by weight of the above antistatic agent.

As mentioned in the description of the resin composition of the spool 3,
In order to secure the light-shielding property of the spool 3, it is necessary to add a light-shielding substance to the resin for the spool 3. Representative examples of the light-shielding substance are shown below. (1) Oxide Representative examples are shown below. Silica, diatomaceous earth, alumina, titanium oxide, iron oxide, zinc oxide, magnesium oxide, antimony oxide, barium ferrite, strontium ferrite, beryllium oxide, pumice, pumice balloon, alumina fiber and the like. (2) Hydroxide Representative examples are shown below. Aluminum hydroxide, magnesium hydroxide and basic magnesium carbonate.

(3) Carbonates Representative examples are shown below. Calcium carbonate, magnesium carbonate, dolomite, dawsonite, etc. (4) (Sulfite) Representative examples are shown below. Calcium sulfate, barium sulfate,
Ammonium sulfate, calcium sulfite, etc. (5) Silicates Representative examples are shown below. Talc, clay, mica, asbestos, glass fiber, glass balloon, glass beads, calcium silicate, montmorillonite, bentonite, etc.

(6) Carbon Representative examples are shown below. Carbon black, graphite, carbon fiber, carbon hollow sphere, etc. (7) Others Iron powder, copper powder, lead powder, aluminum powder, molybdenum sulfide,
Boron fiber, silicon carbide fiber, brass fiber, potassium titanate, lead zirconate titanate, zinc borate, barium metaborate, calcium borate, sodium borate, aluminum paste, talc, etc.

In particular, various carbon blacks are preferable in that they do not adversely affect the photographic film for photography, have a large light-shielding ability, and are inexpensive. An example of classification according to the raw material of carbon black is shown below. Gas black, furnace black, channel black, anthracene black, acetylene black, Ketjen carbon black, thermal black, lamp black, oil smoke, pine smoke, animal black, vegetable black, and the like.

In the present invention, furnace carbon black is desirable for the purpose of improving light-shielding properties, cost, and physical properties. Acetylene carbon black is an expensive light-shielding substance having an antistatic effect, and Ketjen carbon black is a modified by-product carbon black. Is desirable. If necessary, it is also desirable to mix the former and the latter according to required characteristics. Although there are various modes in which the light-shielding substance is mixed with the thermoplastic resin as described above, it can be said that the master batch method is preferable in terms of cost, prevention of workplace contamination, and the like.

Further, the friction coefficient of the spool 3 is reduced,
In addition, it is preferable to add 0.01 to 5.0% by weight of a lubricant in order to improve moldability and prevent static electricity. In particular, in the case of a fatty acid amide-based lubricant having a large lubricating effect and easily bleeding out, it is preferable to add 0.01 to 1.0% by weight. The names of typical commercial lubricants and manufacturers that do not adversely affect the photographic film are shown below.

(1) Silicone-based lubricants Various grades of dimethylpolysiloxane and modified products thereof (Shin-Etsu Silicone, Toray Silicone) and the like. (2) Oleic acid amide lubricants Amos projection CP (Lion Akzo), Neutron (Nippon Seika), Neutron E-18 (Nippon Seika), Amide O (Nitto Kagaku), Alflo E-10 (Nippon Yushi) ), Diamid O-200 (Nippon Kasei), Diamid G-200 (Nippon Kasei) and the like. (3) Erucamide amide lubricant Alflo-P-10 (Nippon Oil & Fats) and the like.

(4) Stearamide amide lubricant Alflo-S-10 (Nippon Oil & Fats), Neutron 2 (Nippon Seika), Diamid 200 bis (Nippon Kasei) and the like. (5) Bis fatty acid amide-based lubricants Bisamide (Nippon Kasei), Diamid 200 bis (Nippon Kasei), Armowax EBS (Lion Akzo) and the like. (6) Alkylamine-based lubricants Electrostripper-7S-2 (Kao Soap) and the like.

(7) Hydrocarbon lubricant liquid paraffin, natural paraffin, micro wax,
Synthetic paraffin, polyethylene wax, chlorinated hydrocarbon, fluorocarbon, etc. (8) Fatty acid-based lubricant Higher fatty acids (preferably C ₁₂ or more), oxy fatty acids and the like. (9) Ester lubricants Lower alcohol esters of fatty acids, polyhydric alcohol esters of fatty acids, fatty alcohol esters of fatty acids, and the like.

(10) Alcohol-based lubricant Polyhydric alcohol, polyglycol, polyglycerol and the like. (11) Metal soap Higher fatty acids such as lauric acid, stearic acid, ricinoleic acid, naphthenic acid, oleic acid and Li, Mg, Ca, S
Compounds with metals such as r, Ba, Zn, Cd, Al, Sn, and Pb.

Finally, typical examples of additives that are added to the spool 3 as necessary are shown below. However, the present invention is not limited to this, and can be selected from all known products. (1) Plasticizer (Representative example) Phthalate ester, glycol ester, fatty acid ester, phosphate ester and the like. (2) Stabilizer (Representative example) Lead-based, cadmium-based, zinc-based, alkaline earth metal-based, organotin-based, etc. (3) Flame retardants (Representative examples) Phosphoric esters, halogenated phosphoric esters, halides, inorganic substances, phosphorus-containing polyols and the like.

(4) Filler (Representative example) Alumina, kaolin, clay, calcium carbonate, mica, talc, titanium oxide, silica and the like. (5) Reinforcing agent (Representative example) glass roving, metal fiber, glass fiber,
Glass milled fiber, carbon fiber, etc. (6) Foaming agents (Representative examples) Inorganic foaming agents (ammonium carbonate, sodium bicarbonate), organic foaming agents (nitrone type, azo type) and the like. (7) Vulcanizing agents (Representative examples) Vulcanization accelerators, accelerators and the like.

(8) Deterioration inhibitors (Typical examples) UV absorbers, metal deactivators, peroxide decomposers and the like. (9) Coupling agent (Representative example) Silane type, titanate type, chromium type, aluminum type, etc. (10) Various thermoplastic resins and rubbers. (11) Nucleating agent (Representative example) Organic nucleating agent (dibenzylidene sorbitol compound), inorganic nucleating agent (calcium carbonate) and the like.

In the embodiment described above, the material and thickness of the disk 7 are changed in order to adjust the prescribed bending elasticity value b of the disk 7, but, for example, as shown in FIG. A plurality of notches 20a may be formed, or the outer periphery of the disc 21 may be divided into a plurality of pieces, as in the disc 21 shown in FIG.

The present invention is not limited to the photographic film patrone in which the disc 7 is pushed out by the side edges of the photographic film 2, but also extends to the inner wall of the patrone main body as described in US Pat. No. 4,834,306. The present invention can also be applied to a device provided with a projection for opening.

[0036]

As described above, according to the photographic film patrone of the present invention, the disk having the projection for preventing the wrapping of the photographic film from being formed around the periphery is formed from a resin containing rubber.
In addition, since the prescribed bending elasticity of the disc is set to 11 g or more and less than 130 g, the torque required for feeding the photographic film can be reduced without sacrificing the effect of preventing the photographic film from being loosened by the disc. As a result, the consumption of the power supply battery of the camera can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a photographic film cartridge embodying the present invention.

FIG. 2 is a cross-sectional view of a main part of a photographic film delivery process of the photographic film cartridge shown in FIG.

3A is a plan view of a disk, and FIG. 3B is a cross-sectional view of the disk.

FIG. 4 is an explanatory view schematically showing a compression tester for measuring a prescribed bending elasticity of a disk.

FIG. 5 is a graph showing a relationship between a prescribed bending elasticity of a disk and a cueing torque of a photographic film.

FIG. 6 is a perspective view showing an example in which a notch is provided in a disk.

FIG. 7 is a perspective view showing an example in which the outer periphery of a disk is divided.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body of patrone 2 Photo film 3 Spool 7, 20, 21 Disc 7a Projection

Claims (1)

(57) [Claims] 1. A spool around which a photo film is wound,
A patrone body that rotatably houses this spool,
A flexible disk provided at both ends of the spool, and the outermost periphery of the photographic film wound on the spool with projections integrally formed in a ring around the periphery of the disk, partially wrapping from both ends In the photographic film patrone in which the projection is deformed so as to spread in the width direction of the photographic film and the photographic film is led out in the vicinity of the photographic film entrance and exit of the patrone body, the disc contains rubber. While being formed from resin,
A photographic film patrone wherein a prescribed value of flexural elasticity for regulating the flexibility of the disc is 11 g or more and less than 130 g.