JPH06295018A - Photographic film cartridge - Google Patents

Abstract

PURPOSE:To provide the photographic film cartridge capable of controlling the eccentricity of a disk with respect to a spool shaft, and efficiently transmitting the rotational force of the disk to a photographic film. CONSTITUTION:The photographic film is fed to the outside of the cartridge with the leading edge of the film first by rotating a pair of disks 25 separately provided on both ends of a spool 23 together with the spool 23. A pair of engaging teeth 37 is provided on the shaft 36 on both ends of the spool 23. A pair of engaging pawls 38 projectingly provided inside an aperture 40 to which the shaft 36 is fitted is provided on the disk 25. An aperture edge 40a which is brought into partially contact with the shaft 36 of the spool 23 is provided inside the aperture 40, and the eccentricity of the disk 25 is regulated. The part of the external periphery of the engaging pawl 38 is notched, so that the pawl 38 is engaged with the engaging teeth 37 when the spool 23 is rotated in a photographic film feeding out direction, and is elastically slightly deformed in the direction. A receiving edge 42 regulating the elastic deformation of the pawl 38 at a fixed position is provided inside the notched part 39.

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 wound in a roll form in a cartridge body is sent to the outside by rotating the spool.

[0002]

2. Description of the Related Art Conventionally, as seen in U.S. Pat. No. 4,423,943, a photo film patrone of a type in which a spool around which a photo film is wound is housed in a patrone body and is sent to the outside by the rotation of the spool. Proposed. In the photographic film cartridge disclosed in this publication, a lip is formed on the outer circumference of a pair of discs integrally formed with the spool so as to partially wrap the outermost circumference of the film from both ends, and the wrapping of the film is loosened by these lips. It is designed so that the rotation of the spool is transmitted to the roll film. An expanding member is provided in the main body of the cartridge in the vicinity of the film outlet to expand the lip to a width larger than the width of the film, whereby the film is led out from the gap between the expanded lip toward the outlet.

By the way, in the photographic film cartridge described in the above publication, since the lip is constantly expanded by the expanding member, the friction between them is large, and the spool driving force is applied not only when the film is sent out. Similarly, when the film does not need to be transmitted to the tip, a high torque of, for example, several 100 gcm is applied to the spool. Therefore, there is a drawback that a large load is constantly applied to the spool driving motor of the camera, and battery consumption is accelerated. To solve this drawback,
In Japanese Patent Application No. 4-103225, a spool is provided with a pair of discs for restricting the looseness of the film, and a one-way clutch means is provided between the spool and the pair of discs. When the disc is rotated in the film feeding direction, the disc engages with the spool and rotates together, and when the spool is rotated in the film storing direction, the disc and the spool are disengaged from each other and only the spool is released. A photo film patrone that can be rotated has been proposed.

FIG. 2 shows an example of the clutch means. The clutch means is composed of a pair of engaging teeth 6 and 7 provided on both end shafts 5a and 5b of the spool 5, and engaging claws 10 and 11 provided on a pair of disks 8 and 9. Engaging claw 1
0 and 11 are openings 1 formed in the central portions of the disks 8 and 9.
It is integrally formed in the inside of 2, 2 along the edges of the openings 12, 13 so as to be elastically deformable. These engaging claws 1
0 and 11 engage the engaging teeth 6 and 7 when the spool 5 is rotated in the film feeding direction, and the engaging teeth 6 and 7 when the spool 5 is rotated in the film winding direction. It is formed in a shape that does not mesh with.

[0005]

However, as shown in FIG. 3, when the spool 5 is rotated in the film feeding direction, the disk 9 is supported between both sides of the photographic film and the inner wall of the cartridge body. While the movement of the spool 5 in the axial direction is restricted, the shaft 5b and the opening 13 of the spool 5 are arranged in the direction orthogonal to the axis.
Since there is a large gap between the cartridge and the cartridge, it rotates while being eccentric inside the cartridge body 13. Therefore, the efficiency of sending and outputting the photographic film is reduced, and the photographic film may not be reliably sent out.

The present invention has been made in consideration of the above-mentioned problems of the prior art. A photographic film which regulates the eccentricity of the disc with respect to the spool shaft and efficiently transmits the rotational force of the disc to the photographic film. The purpose is to provide patrone.

[0007]

In order to achieve the above object, in the present invention, engaging teeth are formed on the outer circumferences of both ends of the spool, and when the spool is rotated in the photo film feeding direction, the disc is rotated. Engaging pawls that mesh with the engaging teeth and elastically deform so as to be disengaged from the engaging teeth when the spool rotates in the photographic film winding direction, and an opening edge that partially contacts the outer circumference of each end of the spool. When,
When the locking claw is deformed to a position where it engages with the engagement teeth, the locking claw is received to form a receiving edge for limiting the deformation at a predetermined position.

[0008]

When the spool is rotated in the photo film feeding direction, the engaging claw and the engaging tooth are engaged with each other. At this time, since the opening edge and the outer circumference of the end portion of the spool are partially in contact with each other,
No disc eccentricity. Further, when the engaging claw and the engaging tooth are engaged, the locking claw is slightly elastically deformed along the rotation direction of the spool. The elastic deformation of the engaging claw is limited at a predetermined position by the receiving edge. When the engaging claw comes into contact with the receiving edge, a pressing force by the engaging claw acts on the receiving edge, and this force acts on the force for feeding the photographic film.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A photographic film cartridge of the present invention is a type in which a spool around which a photographic film is wound is housed in a cartridge body and is sent to the outside by the rotation of the spool. As shown in FIG. 4 and FIG. Cases 20 and 21
Patrone body 22, spool 2
3, a pair of discs 25, and a photographic film 26 wound around the spool 23 with its rear end fixed to the spool 23. And a pair of discs 2
5, the outer periphery of the photographic film is integrally formed with lips 27 that partially enclose the photographic film from both end sides, and these lips 27 prevent the photographic film from being loosened and the spool 2
It is devised so that the rotation of 3 is transmitted to the roll-shaped photographic film. The upper and lower cases 20 and 21 are formed by ultrasonic welding.

The upper and lower cases 20 and 21 have port portions 27,
28 is formed integrally, and when these are combined, it serves as a photographic film delivery port when the photographic film 26 is taken in and out. Inside the lower cases 20 and 21, there are integrally formed a pair of expanding members 30 and 31 for expanding the lip 27 beyond the width dimension of the photo film 26 near the film delivery port. For separation, one expansion member 30 is formed to project slightly longer than the other expansion member 31. As a result, the photographic film 26 is led out toward the photographic film delivery port from between the spread lip 27. The upper and lower cases 2
The combination of 0 and 21 is welded by an ultrasonic welding machine. Further, a well-known telescope 32 for light shielding is previously attached to the inner surfaces of the port portions 27 and 28.

In addition to the expansion members 30 and 31, the upper and lower cases 20 and 21 are integrally formed with a restriction projection 33 for restricting the positions of the pair of disks 25 so that the outer circumferences of the disks 25 are not deformed outward. Has been done. Such upper and lower case 2
0 and 21 are 98% by weight of a mixed resin of 70% by weight of general-purpose polystyrene and 30% by weight of high-impact polystyrene, and a particle diameter of 30 m.
0.5% by weight of furnace type carbon black
And silicone oil (Product name: Silicone oil KF96
H, viscosity 30000CS, manufactured by Shin-Etsu Chemical Co., Ltd.) 1.5% by weight, and injection molded.

The spool 23 is integrally formed with shafts 35 and 36 having a small diameter at both ends in the axial direction, and a pair of disks 25 are inserted into the shafts 35 and 36, respectively. A pair of engaging teeth 37 that form a one-way clutch are integrally formed with the shafts 35 and 36 between the shafts 35 and 36. The pair of engaging teeth 37, as shown in FIG.
It is formed by notching inward from the contour shape of 36,
Further, the spool 26 is formed so as to be symmetrical with respect to the rotation center of the spool 26 by 180 °. Such a spool 26 comprises 98% by weight of a mixed resin of 70% by weight of general-purpose polystyrene and 30% by weight of high-impact polystyrene, 0.5% by weight of a furnace type carbon black having a particle diameter of 30 mμ, and silicone oil (trade name: Silicone oil KF96H, viscosity 30000CS, manufactured by Shin-Etsu Chemical Co., Ltd.) 2.0% by weight and formed by injection molding.

More specifically, as shown in FIG.
An opening 40 into which the shafts 35 and 36 of the spool 23 are fitted is formed therein, and a pair of engaging claws 38 are integrally formed. The pair of engaging claws 38 support a claw portion 38a provided at the tip, the claw portion 38a, and the spool 2
3 and a claw support portion 38b formed in an arcuate shape along the circumferential direction about the axis of the claw 3 as a center.
The base of 8b is left and the notch 39 cut out around them is elastically deformable. Since the notch 39 is connected to the opening 40, the engaging claw 38
The claw portion 38a of the above reigns in the opening 40. Engaging teeth 37
The claw portion 38a and the claw portion 38a are formed in such a shape that they engage with each other when the spool 23 is rotated in the film feeding direction and do not mesh with each other when the spool 23 is rotated in the film storing direction. .

More specifically, as shown in FIG. 1, the notch 3
9, a receiving edge 42 is integrally formed for preventing the engaging claw 38 that elastically deforms when the spool 23 rotates in the film feeding direction at a predetermined position. The receiving edge 42 transmits the rotational force of the spool 23 in the film feeding direction to the disc 25 itself when the engaging claw 18 comes into contact with the receiving edge 42.
Further, since the cutout portion 39 is connected to the opening 40, the shaft support portion 41 formed between the cutout portion 39 and the opening edge 40a of the opening 40 that partially contacts the shafts 35 and 36 of the spool 23. Is also elastically deformable. Therefore, the shaft supporting portion 41 is elastically deformed when the spool 23 is rotated in the film feeding direction.
When pressed by b, the disk 25 itself is pressed toward the center of rotation of the spool 26. The engaging claw 38, the cutout portion 39, the shaft support portion 41, and the receiving edge 42 are the spool 2
It is formed to be 180 ° symmetrical with respect to the center of rotation of 3 and to be slightly thicker in order to increase the strength.

Next, the operation of this embodiment will be described.
When the camera is loaded with the photo film cartridge, the spool 23 is rotated in the film feeding direction by the film initial feeding mechanism of the camera. This rotation causes spool 2
6 engages with the pair of engaging teeth 37 and the claw portions 38a of the pair of engaging claws 38 provided on the disk 25. At this time,
Since the engaging tooth 37 is rotating in the direction of arrow A shown in FIG. 1, the engaging claw 38 is elastically deformed in the direction of the chain line arrow B shown in FIG. Due to the elastic deformation of the engaging claw 38, the claw support portion 3
8b presses the shaft support portion 41 toward the center of rotation of the spool 23.

Thereafter, the engaging claw 38 comes into contact with the receiving edge 42, and the elastic deformation of the engaging claw 38 is prevented. This allows
The disk 25 rotates integrally with the spool 26 in the same direction. At this time, the pressing force of the engagement claw 38 is generated on the receiving edge 42 in the direction of the one-dot chain line arrow B shown in FIG. When this pressing force is decomposed, the one-dot chain line arrows C and D
Becomes

Since the engaging claws 38 are formed 180 ° symmetrical with respect to the center of rotation of the spool 23, the force acting in the direction of the one-dot chain line arrow D, that is, the force acting in the centrifugal direction, is the spool 23. Since they work symmetrically with respect to the center of rotation of 180, they are offset and balanced, so that the disk 25 is not eccentric. On the other hand, the alternate long and short dash line arrow C is a force that gives a rotational force to the disc 25 itself,
Since the disc 25 is not eccentric, the force for rotating the disc 25 can be efficiently transmitted to the photographic film without loss.

When the disk 25 rotates together with the spool 23, the photographic film 26 tries to be unwound.
Since the outer periphery of the film 25 is regulated so as not to spread outward by the regulation projection 33 except for the vicinity of the film delivery port, the lip 27 presses the outermost edges of the photo film 26, and the photo film 26 The rotation of the spool 23 is transmitted to the tip of the photographic film 26 without being unraveled.

In the vicinity of the entrance of the film delivery port, the restriction projection 33 is omitted, and the expanding members 30 and 31 push the lip 27 outward so that the restriction of both ends of the photographic film 26 is released. . Spool 23
As the rotation of the photo film advances, the leading end of the photographic film is separated by the expanding member 30, rides on the upper surface of the expanding member 30, and is sent to the outside through the photographic film delivery port. After that, the leading end of the photographic film 26 is caught by the winding shaft on the camera side, and thereafter, the film is fed by driving the winding shaft.

When the photo film 26 is taken up and the photo film 26 is wound around the main body of the cartridge, the spool 23 is reversed in the film accommodating direction. When the spool 23 is reversed in the film storage direction, the engagement between the engagement tooth 37 and the engagement claw 38 is released, the engagement claw 38 returns to the original position, and the state shown in FIG. Since the engaging teeth 37 and the engaging claws 38 do not engage with each other when the spool 23 rotates in the film storage direction, only the shafts 35 and 36 of the spool 23 rotate and the disk 25 does not rotate. The spool 23
The engaging teeth 37 come into contact with the engaging claws 38 during rotation of the film in the film storage direction, but there is no problem because the engaging claws 38 elastically deform toward the outside. Further, although the disc 25 tries to follow the rotation of the spool 23 due to the frictional resistance and the photographic film 26 at this time, the resistance applied to the lip 27 of the disc 25 spread by the expanding members 30 and 31 is stronger. The film 25 does not rotate.
As a result, only the spool 23 is rotated and the drive motor on the camera side is driven with a light load.

Although the receiving edge 42 has a straight surface in the above embodiment, the present invention is not limited to this, and it may have a straight surface. FIG. 8 shows that the blocking wall has two straight surfaces 51, 5
2 shows the disk 50 formed as No. 2, and the same parts as those described in the above embodiment are designated by the same reference numerals and the description thereof will be omitted.

Further, in the above embodiment, the engaging claw 38, the notch 39, the shaft support 41, and the receiving edge 42 are formed 180 ° symmetrical with respect to the center of rotation of the spool 23. The invention is not limited to this, and it goes without saying that the same effect can be obtained even one by one. Further, in the above embodiment,
Although the shaft support portion 41 is provided separately from the engaging claw 38, the shaft support may be integrally provided inside the claw support portion 38b. In this case, it is desirable that at least two shaft support portions are provided at a predetermined distance, and these shapes are arc projections.

The resin material for the cartridge main body composed of the upper and lower cases 20 and 21 and the spool 23 is not limited to the material described in the above embodiment, but carbon black of 0.05% by weight to a light-shielding agent is used. A resin containing 3.00% by weight is sufficient. In addition, lubricants such as silicone oil, antistatic agents, inorganic or organic pigments such as titanium oxide, processing aids such as zinc stearate, antioxidants, nucleating agents, plasticizers, etc. may be added to such resins as required. It may be contained.

Examples of the resin include polystyrene resin, impact-resistant polystyrene resin, styrene-acrylonitrile copolymer resin, styrene-acrylonitrile-butadiene copolymer resin, polypropylene resin, high-density polyethylene resin, polyethylene terephthalate resin, polybutylene terephthalate resin. Polycarbonate resin, polyvinyl chloride resin, and modified resins thereof are suitable. When considering dimensional accuracy, physical strength, and ultrasonic welding suitability, the melt flow rate is 1.0
Impact-resistant polystyrene resins containing 0.1 to 10% by weight of synthetic rubber for up to 10.0 g / 10 minutes, preferably 2.0 to 8.0 g / 10 minutes, and particularly preferably 2.5 to 7 g / 10 minutes are preferred. The other preferable required property of this resin is a flexural modulus of 15,000 to 30,000 kg / cm ² , preferably 1,8,000 to ² from the viewpoint of preventing deformation.
8,000 kg / cm ^2, particularly preferably 20,000~28,000kg / cm ^2, Vicat softening point (15 kg load) 80 ° C or higher, preferably 85 ° C or more, and particularly preferably 90 ° C or higher.

The carbon black contained in such a resin is added to secure the light shielding property. There are furnace carbon black, channel carbon black, thermal carbon black, etc., classified by the manufacturing method of carbon black, but there are photographic adverse effects (such as fog generation, decreased sensitivity or increased photosensitivity).
Average particle size is 10-80
Furnace carbon blacks with mμ and PH 5 to 9 are preferred, and furnace carbon blacks with 15 to 50 mμ and PH 6 to 8 are particularly preferred.

Commercial products include, for example, carbon black # 20 (B), # 30 (B), # 33 (B), # 40 (B), # 41 (B), # 44 manufactured by Mitsubishi Kasei.
(B), # 45 (B), # 50, # 55, # 100, # 600, # 2200 (B), # 2400 (B), MA
8, MA11, MA100 etc. can be mentioned. As an overseas product,
For example Cabot Black Pearls 2, 46,70,71,74,8
0,81,607 etc., Regal 300,330,400,660,991, SRF-S etc., S
terling 10, SO, V, S, FT-FF, MT-FF, etc. In addition, Ashland Chemical's Uniteel R, BB, 15,102,
3001,3004,3006,3007,3008,3009,3011,3012, XC-3016, XC
-3017, 3020 and the like, but not limited thereto.

The particle size of the furnace carbon black is 10
If it is less than mμ, the kneading property with the resin is poor and the light-shielding property and the physical strength are deteriorated. On the other hand, if it exceeds 100 mμ, the light-shielding ability is inferior even if the dispersion is good, and if the carbon concentration is increased to secure the light-shielding property, the physical strength is lowered and the moldability is deteriorated, so that it cannot be put to practical use. Further, most of the carbon blacks having a PH exceeding 5 to 9 are apt to cause photographic adverse effects and cannot be used.

The amount of furnace carbon black added is
From the viewpoints of securing the light-shielding property, injection moldability, and securing the physical strength of the cartridge main body, 0.05 wt% to 3.00 wt% is preferable. If the amount of carbon black added is less than 0.05% by weight, the light-shielding property is insufficient, and if it exceeds 3.00% by weight, the physical strength of the Patrone body is reduced and the water absorption rate is increased. Streaks etc. occur, causing poor appearance and deterioration of surface strength.

As the light-shielding material, in addition to carbon black, an inorganic pigment such as titanium oxide, red iron oxide, calcium carbonate, or an organic dye may be used in combination.

As a method of imparting lubricity to the cartridge body or the spool, there are a method of adding a lubricant to a resin for molding them and a method of applying a lubricant to a molded product. Examples of the lubricant include silicone oils, higher fatty acid amides such as oleic acid amide and erucic acid amide, metal salts of higher fatty acids such as zinc stearate, higher alcohol esters, and fatty acid esters of polyhydric alcohol esters. It is not limited.

As silicone oil to be added to the cartridge body or the spool, Japanese Patent Application Laid-Open No. 62-286.
Dimethylpolysiloxane and carboxyl-modified silicone oil described in JP-A No. 043 or JP-A No. 62-284355 are preferable. The amount of silicone oil added is 0.05% to 5.0% by weight, preferably 1.
It is between 0% and 3.0% by weight.

If it is less than 0.05% by weight, the desired lubrication effect cannot be obtained, and if the amount added exceeds 5.0% by weight, not only the resin slips in the screw of the injection molding machine but the molding cycle becomes longer, The amount of silicone oozing on the surface of the molded product increases, and the oozing oil is transferred to the photographic film inside the Patrone body, and when the photographic film is developed, it adversely affects the photographic solution, such as the diffusion of the developing solution into the photographic film. To do. In addition, in the ultrasonic sealing, the adhesion between the upper and lower cases is reduced.

Silicone oil has a viscosity of 1000 at 25 ° C.
It is preferably -60,000 CS. Viscosity at 25 ° C is 1000
If it is less than CS, the bleed-out will be severe and the photographic performance will be affected. If it exceeds 60000CS, the kneading property with the resin is poor and it cannot be used. In addition to the above, various modified silicone oils such as fluorine-modified silicone oils are commercially available as silicone oils, but most of them adversely affect the photographic properties of photographic films, so it is important to use them carefully. is there. It could not be used for photographic film cartridges because of insufficient lubricity or severe thermal decomposition during injection molding.

[0034]

As described above, according to the present invention,
Since the disk has an opening edge that partially contacts the outer circumference of each end of the spool, the rotation of the disk is not eccentric to the spool, so the rotational force of the disk must be reliably transmitted to the photographic film. You can Further, when the locking claw is deformed to the position where it meshes with the engaging teeth, the disk is formed with a receiving edge that receives the locking claw and limits the deformation at a predetermined position. It works, and this force acts on the rotational force of the disc, so that the photographic film can be delivered more reliably.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a state of a disc and a spool when the spool is rotated in a photo film feeding direction.

FIG. 2 is an exploded perspective view showing a main part of the photographic film cartridge described in the related art.

FIG. 3 is a schematic explanatory view showing a clutch means described in the related art.

FIG. 4 is an exploded perspective view showing a photographic film cartridge of the present invention.

FIG. 5 is a sectional view of a photographic film cartridge of the present invention.

FIG. 6 is a vertical cross-sectional view showing a disk and a spool according to an embodiment.

FIG. 7 is a cross-sectional view showing a disk and a spool according to an embodiment.

FIG. 8 is a longitudinal sectional view of a disc and a spool showing another embodiment.

9 is a vertical cross-sectional view showing a state in which the spool shown in FIG. 8 is rotated in the photo film feeding direction.

[Explanation of reference numerals] 21 upper case 22 lower case 23 spool 25 disc 26 photo film 38 engaging claw 38a claw 38b claw support 41 shaft support 42, 51, 52 blocking wall

Claims (1)

[Claims] 1. A photographic film cartridge in which, when the spool is rotated in the photographic film feeding direction, disks separately provided at both ends of the spool are rotated together with the spool to feed the photographic film to the outside from the tip thereof. Engagement teeth are formed on the outer circumference of both ends of the spool, and the disc engages with the engagement teeth when the spool rotates in the photo film feeding direction, and when the spool rotates in the photo film winding direction, the engagement tooth is formed. An engaging claw that elastically deforms so as to be disengaged from the joint teeth, an opening edge that partially contacts the outer circumference of each end of the spool, and a lock when the locking claw is deformed to a position where it meshes with the engaging teeth. A photographic film cartridge which is formed with a receiving edge for receiving a nail and limiting its deformation at a predetermined position.