JP3530255B2 - Photographic film cartridge and method of manufacturing flange used for the same - Google Patents

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 which sends a photographic film to the outside of a cartridge body by the rotation of a spool shaft. More specifically, it is of a type in which flanges are attached to both ends of a spool shaft around which the photographic film is wound. This is about the photo film patrone.

[0002]

2. Description of the Related Art For the purpose of simplifying the loading of a photographic film cartridge into a camera, improving the working efficiency in a developing station, and improving the handling of the photographic film cartridge, the photographic film is wound up to the spool even up to its tip. The photo film patrone, which is stored in the patrone main body, is fed to the camera, and the tip of the photo film is sent out from the opening provided in the patrone main body when the spool is rotated, is US Pat. No. 4,634,306. Description, No. 4832275, JP-A-3-3764
It is proposed in Japanese Patent Publication No. 5 and the like.

In such a photographic film cartridge,
A pair of flanges are rotatably attached to both ends of the spool. The pair of flanges are formed of a flexible plastic material, and have a thin plate-shaped cross section. A circular opening that rotatably engages with the flange engaging portion is formed in the central portion of the dish shape. Further, the pair of flanges are integrally formed with tongue-shaped lips on the outer peripheral edge portions of the dish-shaped concave side. These lips, when attached to the spool, face each other and wrap around the outermost edges of the photographic film wound between them. By these lips, the rotation of the spool can be transmitted to the outermost periphery of the photographic film, and the photographic film is prevented from being loosened.

Flange engaging portions for attaching a pair of flanges are integrally provided at both ends of the spool. The flange engaging portion is composed of a stopper and a locking claw. The stopper abuts the flange to be inserted and limits the insertion amount. The locking claw is provided at a position closer to the insertion side end of the flange than the stopper.When the flange is inserted, the edge of the opening of the flange is pressed and the flange is deformed so as to widen the opening while passing the flange. After the passage, the flange abuts on the edge of the opening and restricts the movement of the flange to the end portion on the insertion side.

By the way, when the photographic film is sent out, it is necessary to partially release the regulation for loosening the photographic film by the lip. As a releasing method, a pair of separating claws are provided on both sides in the width direction of the film, and a pair of separating claws are partially deformed in a direction in which the lips are separated from each other, and a single separating claw is used. There is a method in which the tip of the photographic film partially deforms the pair of lips at the edges of the photographic film so as to separate them from each other.

As described above, since the flange is always deformed and rotates, it is necessary to have appropriate elasticity. In order to give the flange such characteristics, it is necessary to first select a material. Moreover, when selecting this material, it is necessary to consider the molding method. A material and a molding method which are preferable in consideration of both of these are disclosed in JP-A-4-251.
841 and Japanese Patent Laid-Open No. 6-148808. In those disclosed in these publications, a thin polyethylene resin sheet (thickness 0.3 mm) formed by extrusion is softened by heating and thermoformed by vacuum or pressure forming,
After that, an opening is formed by punching into an inner and outer shape in a punching process.

[0007]

However, it has been found that it is difficult to attach the flange to the flange engaging portion of the spool. This is because when punching the thermoformed product flange into the inner and outer shapes in the punching process, small burrs and burrs are generated at the edge of the flange opening slightly protruding along the punching direction. This is because if it occurs at the opening edge on the insertion direction side, it will be caught by the locking claw.

Further, when burrs and burrs are formed on the opening edge on the side opposite to the insertion direction side of the flange, the flange can be smoothly mounted on the flange engaging portion, while the spool is rotated. Burrs and burrs rub against the stopper of the flange engaging portion, increasing frictional resistance and making rotation difficult. Also, it is easily rubbed and abraded, and powder is generated due to the abrasion, and the powder may be sent out from the patrone body together with the photographic film to contaminate the camera and be reflected in an image.

The present invention has been made in order to solve the above-mentioned problems. It is possible to easily attach a pair of flanges and a spool shaft, to reduce the frictional resistance between the flanges and the spool, and to prevent abrasion powder. The purpose is to provide a photographic film cartridge that does not occur.

[0010]

To achieve the above object, the flange of the present invention is such that the flange is inserted into a spool.
Punch punch in the direction opposite to the flange insertion direction.
The openings are punched in the same direction .
If injection molding is used to form a step on the surface opposite to the punch entrance surface by reducing the thickness on the punching member side, and then punching along the step from the punch entrance surface to form an opening, burr and Since the burr does not protrude so much from the thickness profile of the flange, it is possible to prevent generation of abrasion powder. Furthermore, injection-molded on both sides, a stepped portion with a reduced thickness on the punching member side and a rounded portion or chamfered portion on the corner portion of the stepped portion on the punch entry surface side connecting to the non-punched portion are formed. After that, if you punch out from the punch entry surface along the stepped portion to form an opening, a part of the rounded portion or chamfer remains at the opening edge on the flange insertion side, so that the spool can be mounted smoothly. Become.

The method of manufacturing the flange is carried out by a step of forming a flange of a molded product by molding in a dish shape in section and a punching process of punching the flange of the molded product to form an opening through which a spool is inserted in the central portion. . Thermoforming or injection molding is preferable as the mold molding.

The structure of the photographic film cartridge of the present invention will be described with reference to the drawings. In FIG. 1, the cartridge main body 10 is composed of an upper case 11 and a lower case 12 each made of plastic. A spool 13 is rotatably housed inside the cartridge main body 10, and a photographic film 14 is wound around the spool 13 in a roll shape.

The photographic film 14 uses, as a support, triacetate, polyester, polyphenylene naphthalate, polycarbonate or the like having a thickness of 0.07 to 0.15 mm, and the surface thereof is coated with a light-sensitive emulsion according to the type of film. ing. The back layer need not be provided in particular, but a layer of nitrocellulose, diacetylcellulose, triacetylcellulose, butyral resin, gelatin, polycarbonate or the like to which a magnetic recording layer, an antistatic agent, a conductive substance, a lubricant or the like is added is formed. You can use one.

Each of the upper and lower cases 11 and 12 is made by resin molding, and the molding material thereof has a small frictional resistance with the flange, can sufficiently withstand a drop impact, and is not easily thermally deformed. Required. Specifically, styrene resin, polycarbonate resin, ABS resin, polyester resin, nylon resin, modified polyphenylene ether resin, polyacetal resin, polypropylene resin, polyethylene resin, methylmethacryl resin, Teflon resin, polyphenylene sulfide resin, or these resins. The mixed resin of is mentioned.

Each of the upper and lower cases 11 and 12 has a substantially semi-cylindrical shape, and a port portion 15 is formed so as to project in a part thereof. Upper case 11 and lower case 12
When fitting and, the light shielding lid 16 is rotatably fitted in the port portion 15. A flat film passage 17 is formed in the light-shielding lid 16 and serves as a passage for the photographic film 14 delivered from the inside of the cartridge body 10 when the light-shielding lid 16 is rotated to the open position. When the light-shielding lid 16 is rotated to the closed position, the opening (photo film entrance / exit) formed at the tip of the port portion 15 is completely closed, and the inside of the cartridge body 10 is in a light-shielding state.

A protrusion 18 is formed in the lower portion of the port portion 15 of the lower case 12. This protrusion 18 is for the spool 1
This is a guide for picking up the leading end portion of the photographic film 14 wound around 3 and guiding it to the film passage 17. The flanges 19 and 20 have a thin dish shape in cross section, and openings 19a and 20a are formed in the centers of the thin dish shapes, respectively. The spool 13 has flange engaging portions 13 at both ends.
a and 13b are integrally formed, and the flanges 19 and 2
The respective openings 19a and 20a of 0 are inserted into the flange engaging portions 13a and 13b by inserting the openings 19a and 20a into the spool 13, and the flanges 19 and 20 are rotatably attached to the spool 13.

A fan-shaped display plate 23a is integrated with the use display part 23, and the state of use of the photographic film cartridge can be determined by checking the position through a display window formed in the cartridge body 10. It has become.

Side ribs 26 are provided on the inner side walls of the upper case 11 and the lower case 12 to prevent the flanges 19 and 20 from expanding. A fan-shaped plate 27 is fixed to the spool 13, and a data flange label 28 is attached to the surface thereof. A bar code is radially written on the label 28, and the bar code is photoelectrically detected through a window 29 formed on the side surface of the cartridge body 10 when the spool 13 is rotated. As a result, the type information of the photographic film 14 stored in the Patrone main body 10,
Information such as the number of shots can be electrically detected. The label 30 attached to the cartridge body 10 includes
The film type display and unique Patrone number are displayed.

The spool lock part 31 locks the spool 13 so as not to rotate when the light-shielding lid 16 is rotated to the closed position. This lock is released when the light shielding lid 16 moves to the open position. Reference numeral 32 denotes a lock pole integrally formed with the upper case 11, and the light shield lid 16 is locked by the lock pole 32 when it is rotated to the closed position. This lock is disclosed by the opening mechanism of the light-shielding lid 16 provided in a device such as a camera or a display device when the photographic film cartridge is set. Instead of using the light-shielding lid 16, it is also possible to form a film passage in the inner wall of the port portion 15 and attach a telemp to the film passage to keep the inside of the cartridge body 10 light-tight.

Lips 21 are integrally formed on the outer circumferences of the flanges 19 and 20, as shown in FIG. The lips 21 project so as to face the other flanges 19 and 20, respectively, and partially enclose the outermost periphery of the photographic film 14 wound around the spool 13 from both end surface sides.

As for the thickness of the lip 21, it is desirable to increase the thickness toward the tip in the protruding direction to reinforce the photographic film 14 in order to regulate the looseness of the photographic film 14. In addition, in order to reduce friction generated between the outermost periphery of the photographic film 14 and the inner peripheral surface 21a of the lip 21, a cross-sectional shape inclined so that the inner side of the inner peripheral surface 21a is separated from the outermost periphery of the photographic film 14. It is said that.

A collar 22 is integrally provided on the outer periphery of the lip 21. The collar 22 has a reinforcing action to prevent the lip 21 from spreading. Further, in order to have a function of guiding the photographic film 14 toward the inside of the lip 21 when the film is rolled up, the brim 22 has a sectional shape in which the tips of the facing surfaces 22a are inclined so that they are separated from each other. ing. As for the wall thickness of the brim 22, when guiding the photographic film 14, it has a certain strength so as not to be crushed by the photographic film 14,
In order to provide optimum moldability, it is desirable to mold the cross-sectional shape so that it becomes thicker toward the tip.

The flange 20 is formed with a plurality of locking holes 25 so as to surround the opening 20a. When the use indicating component 23 is fitted into the spool 13, the clutch claw 2 is formed.
4 and the locking hole 25 of the flange 20 are locked to each other when the spool 13 is rotated in the film feeding direction,
The flange 20 can be forcibly rotated. Also,
When the spool 13 is rotated in the film winding direction, the flange 20 can freely rotate without the clutch claw 24 and the locking hole 25 of the flange 20 being locked. Also, the other flange 19 remains rotatable with respect to the spool 13.

Thus, the pair of flanges 19 and 20 are
Since the functions are different from each other, the photographic film 14 cannot be sent out if they are installed in reverse. Therefore, the flange engaging portions 13a and 13b of the spool 13 are formed with a large diameter and a small diameter, respectively, and the pair of flanges 1
The openings 19a and 20a of 9 and 20 are also set to have a large diameter and a small diameter, respectively, in order to prevent a mounting error.

As shown in FIG. 3, the flange engaging portion 13a
Has a ring shape having a diameter larger than that of the film winding portion of the spool 13, and is configured in order from the insertion direction of the flange 19 (the direction of the arrow shown in the figure) to the locking claw 33, the groove 34, and the stopper 35. Consists of. A plurality of locking claws 33 are provided along the outer periphery at a predetermined pitch.
Has a right-angled triangular cross-section with an inclined surface 33a on the insertion side of the flange 19.

The fan-shaped plate 27 has a diameter larger than that of the flange engaging portion 13a. Therefore, the flanges 19, 20
Is inserted from the flange engaging portion 13b side of the spool 13. The flange 19 is inserted with the convex surface 19b side facing the spool 13. The locking claw 33 deforms the flange 19 so as to push the edge of the opening 19a by the inclined surface 33a and spread the opening 19a.
4 and allow passage through the flange 1
When 9 enters the groove 34, the vertical surface on the side opposite to the inclined surface 33a contacts the edge of the opening 19a of the flange 19 so that the flange 19 rides over the locking claw 33 and the end of the spool 13 on the opposite side in the insertion direction. To move to the department.

The groove 34 has a diameter slightly smaller than the opening 19a and a width slightly wider than the thickness of the flange 19, and rotatably supports the flange 19. The stopper 35 contacts the edge of the opening 19 a of the flange 19 to regulate the insertion amount of the flange 19.

FIG. 4 shows the flange engaging portion 13b. The flange 20 has a spool 13 on the concave surface 20b side.
It is inserted in the state of facing. The flange engaging portion 13b is formed with a diameter smaller than that of the flange engaging portion 13a, and in order from the insertion direction of the flange 20 (the arrow direction shown in the figure), the engaging claw 36, the groove 37, and the stopper 38. It is configured. The locking claw 36, the groove 37, and the stopper 38 have the same shape and function as the locking claw 33, the groove 34, and the stopper 35 described in FIG.

As shown in FIG. 5, when the photographic film 14 is completely wound inside the cartridge body 10, the outermost circumference of the photographic film 14 is partially wrapped by the lips 21 and 21 of the flanges 19 and 20. Therefore, loosening of the spool 13 is prevented. This allows
When the spool 13 rotates in the feeding direction of the photo film 14, the photo film 14 rotates together with the spool 13.

The side ribs 26 provided on the inner side walls of the upper and lower cases 11 and 12 regulate the flanges 19 and 20 so that the flanges 19 and 20 do not spread, but the regulation is released at the back of the port portion 15. , Side ribs 26 facing each other
The distance between them is widened. Therefore, after the tip of the photographic film 14 is scooped up by the protrusion 18, the flanges 19 and 20 spread slightly outward when advancing to the film passage 17, so that the photographic film 14 has the lips 21 and 21.
Gutter-like curls will be made from between and sent out.
The same effect can be expected if the side ribs 26 are provided on only one side.

When the above-mentioned photographic film cartridge is loaded in the camera, the lock of the light shielding lid 16 by the lock pole 32 is released by the mechanism on the camera side, and then the light shielding lid 16 is rotated in the opening direction. After that, the spool 13 is driven in the delivery direction, and the delivery of the photographic film 14 is started. Lip 2 formed on the outer circumference of the flanges 19 and 20
Since the photo films 1, 21 prevent the photo film 14 from being loosened, the photo film 14 rotates integrally with the spool 13. During this rotation, the leading edge of the photographic film 14 is picked up by the projection 18 and guided to the film passage 17.

When the leading edge of the photographic film 14 is guided to the film passage 17 in this way, the lips 21, 21 are spread to both sides by the photographic film 14, so that the wrapping of the photographic film 14 is released inside the film passage 17. Since the one flange 20 is forcibly rotated in the feeding direction by the engagement of the clutch claw 24 and the locking hole 25, the force for feeding the photographic film 14 is strengthened.
In this way, the photographic film 14 comes to be sent out of the cartridge main body 10.

At the time of rewinding, the spool 13 is rotated in the opposite direction. Since the rear end of the photographic film 14 is locked to the spool 13, the photographic film 14 is wound inside the cartridge body 10 by the reverse rotation of the spool 13. At this time, the flanges 19 and 20 are widened in the depth of the film passage 17, and the surface 22a of the collar 22 guides the photographic film 14 toward the inside of the lips 21 and 21 to dispose the lips 21 and 21 at both ends of the photographic film 14. The photographic film 14 is drawn between the flanges 19 and 20 and is wound around the spool 13 in order to spread the film.

[0034]

Embodiments It is necessary that such flanges 19 and 20 be easily attached to the spool 13 and that abrasion powder not be generated even when the spool 13 is rubbed. However, such a problem may occur depending on the method of forming the flanges 19 and 20. Therefore, the ease of attachment to the spool 13 and the generation of powder due to abrasion with the spool 13 were examined by the molding method described in each of the following examples.

[First Embodiment] Extruded thickness of 0.
An 11 mm resin sheet (Zylon 9101 (trade name)) is heat-softened in a thermoforming step and thermoformed by vacuum or pressure forming, and then punched into inner and outer shapes to form openings. The sheet that has passed the thermoforming step is directly conveyed to the punching step. Two dies are attached to the punching machine. One mold is for punching to form the opening 19a to obtain the flange 19, and the other mold is for punching the opening 2a.
0a and a plurality of locking holes 25 are formed to obtain the flange 20. Then, the sheet is measured and conveyed, and these dies are operated simultaneously, so that the pair of flanges 19 and 2
Get 0 at the same time.

[Second Embodiment] In the thermoforming described in the first embodiment, the heating step of heating the resin sheet pulled out from the roll, the forming step of subjecting the heated sheet to vacuum or pressure forming, and the forming portion of the sheet are performed. Since various processes such as a punching process for punching to obtain a flange and a sheet collecting process are required, the equipment tends to be large-scale and the equipment cost becomes high. In addition, a surplus sheet is generated after punching, resulting in waste of material cost. Further, there is a large variation in the bending angle after thermoforming, and it is difficult to locally change the thickness. Therefore, in the second embodiment, the molded product flange is molded by injection molding.

In injection molding, the formability is determined by the outer shape and thickness of the flanges 19 and 20, and the resin used. The flanges 19 and 20 have an outer diameter of 18 mm and a maximum projected area of 250 mm ² or more with a circular contour. The opening 19a of the flange 19 is 12 mm and the opening 20a of the flange 20 is 8 mm. If the average thickness is too thin, the fluidity of the molten resin in the mold is poor, and if the average thickness is too thick, the film winding loosening regulation force of the lip 21 becomes strong, and the frictional resistance between the photographic film 14 and the lip 21 becomes large. Therefore, 0.07 to 0.2 mm is preferable.

The resin has a flexural modulus of 15,000 Kg / cm ²
Those having a physical property value of up to 30,000 Kg / cm ² and excellent fluidity in the mold, for example, melt flow index [MI value] (JIS-K7210, moldable temperature 280
C., load 10 kg) is preferably 70 g / 10 minutes or more. Specifically, 66 nylon alloy Y19A
(Sumitomo Chemical Co., Ltd.) is preferable. The characteristic values of this resin are shown in Table 1.

[0039]

[Table 1] In addition, t represents thickness and the unit is mm.

As the injection molding machine, a CYCAP 165/75 M III type manufactured by Sumitomo Heavy Industries, Ltd. was used. As shown in FIG. 6, the mold 39 for the flange 19 has a concave surface 19c side (lip protrusion side) and a convex surface 19b side of the flange 19 which are a movable mold 40 and a fixed mold 41, respectively.
It consisted of a set of pieces. The guide pin 42 has the opening 19
The flange 19 is formed in parallel with the axis passing through the center of a, and the flange 19 is formed by a simple back-and-forth movement in which the movable die 40 is moved along the guide pin 42. The mold may be a family take mold that simultaneously molds the pair of flanges 19 and 20. In this case, it is composed of three plates, a fixed type, an intermediate type, and a movable type, and a sprue, a runner, and a gate are provided between the fixed type and the intermediate type, and between the intermediate type and the movable type. Type 3 that composes a molded product flange
It is preferable to use a one-piece mold.

In injection molding, molding defects such as weld lines, short shots, sledges, sinks, crazing and cracking may occur depending on the shape, position and number of gates. Therefore, the gate is a disk gate, and the gate thickness is the same as the average thickness of the flanges 19 and 20,
Further, the gate land length F is set to 0.1 to 2 mm. The reference numeral 47 indicates a disc gate portion.

The sprue 43 is provided on the fixed die 41 on the axis passing through the center of the opening 19a. The tip of the runner lock pin 45 bites into the gold slag well 44 of the movable die 40. This runner lock pin 45
Draws the molded product flange when the movable die 40 is opened, and pushes out the flange when completely opened. It should be noted that a protruding pin may be provided so as to protrude. The inner peripheral surface 21a of the lip 21 is undercut, but the angle of the inner peripheral surface 21a is set so that the inner peripheral surface 21a is not deformed even if it is forcibly removed.

As conditions for injection molding, the cylinder temperature was 280 ° C and the mold temperature was 80 ° C. In injection molding, shortening the cycle time consisting of injection time, pressure holding time, cooling time, mold opening time, intermediate time, and mold closing time is essential for production efficiency. However, the flanges 19 and 20 of the present embodiment have a sectional shape in which the surface on which the openings 19a and 20a are formed is more recessed than the surface on which the lips 21 and 21 are formed, so the tip of the flange 22 (the end of the cavity).
Since the resin does not flow easily, the maximum flow path length (l) from the disk gate to the end of the mold is long, and the average thickness (t) is extremely thin, L / L is generally 50 to 80. The ratio of t becomes 130 to 140, and defective molding such as local short shot is likely to occur. The mold for the flange 20 has the same structure as the mold 39 described above, and the locking hole 2 is provided between the movable mold 40 and the fixed mold 41.
5 is molded at the same time.

The molded product flange taken out from the mold is punched along the disc gate in the punching process to remove the runner 46 and form the openings 19a and 20a. According to this, since the trace of the gate does not remain on the flange,
It is possible to reliably prevent scratches on the photographic film 14 and troubles in feeding the film. As the punching press, HYP305S (tabletop hydraulic press) manufactured by Japan Automatic Machine Co., Ltd. was used. The material of the punch and die is powder high-speed steel, and the clearance between them is 7μ or less on one side,
The cutting edge is coated with TiN (titanium nitride) to form a carbide blade.

In punching, "drip", "fracture surface", "burr", "burr", etc. occur on the sheared cut surface. The "drip" refers to a phenomenon in which a rounded portion is formed along the punching direction at the edge of the sheared cut surface on the punch entrance surface side. “Burr” or “burr” refers to a phenomenon in which a small piece slightly protrudes along the punching direction of the punch at the edge of the sheared cut surface opposite to the punch entrance surface side. "Fracture surface" means "who" and "burr" or "burr."
It is a phenomenon in which a separated surface resulting from a crack, that is, a jagged surface is formed on the sheared cut surface between and.

The flanges 19 and 20 need to be easily attached to the spool 13. Therefore, in this punching process, "burrs" and "burrs" are not shown in the flange engaging portion 13.
The punching direction is set to each flange 19, so as not to be caught by the locking claws 33 and 36 of a and 13b and become difficult to attach.
The insertion direction of 20 was adjusted to the opposite direction. FIG. 7 shows a schematic of a punching machine 50 for the flange 19. Since the convex surface 19b of the flange 19 is inserted toward the spool 13, the flange 19 is set in the die 52 in the punching machine 50 with the convex surface 19b facing the punching direction of the punch 51 (the arrow direction shown in the figure). It Further, the flange 20 is punched by a punching machine 53 as shown in FIG. Since the flange 20 is inserted into the punching machine 53 with the concave surface 20b facing the spool 13, the punch 20 is set in the die 55 with the concave surface 20b facing the punching direction of the punch 54 (the arrow direction shown in the drawing).

[Third Embodiment] In the third embodiment, the second embodiment is executed.
The same molding method as described in the example is performed. The difference is that
Disc gate part 4 of flange of molded product obtained by extrusion molding
The step portion 58 is formed along the line 7. The step 58 is
The thickness of the punching member side opposite to the insertion side of the chisels 51, 54
Can be formed by thinning. That is, as shown in FIG.
As shown in FIG.
Movable type 56 in which the thickness t1 is thinned by 10 μm from the concave surface 19c
To use. Molded product flan obtained by using this mold 59
The 19 ^,The gate land on the concave surface 19c side is recessed by one step.
The thickness t1 here is approximately 10 μm thinner than the concave surface 19c.
Become. This molded product flange 19^,As shown in Figure 10
Then, the step 58 is directed to the die 52 and
Set. For punching, punch 51 and die 52
The cutting edge of the shears along the step portion 58.

In the case of an injection molding die for the flange 20, a fixed die is used in which the thickness of the gate land is thinner than the convex surface 20c of the flange 20 by 10 μm. In the molded product flange molded using this mold, the gate land on the convex surface 20c side is recessed by one step, and the gate land thickness t1 is the convex surface 2
It becomes thinner by approximately 10 μm from 0c. This molded product flange is set so that the step portion 58 faces the die 55 of the punching machine 53. In punching, the cutting edge of the punch 54 and the die 55 shears along the step portion 58.

[Fourth Embodiment] In the fourth embodiment, the depth of the stepped portion 58 of the molded product flange described in the third embodiment is changed. That is, the thickness t1 of the gate land is thinly formed by 30 μm from the concave surface 19c, and the flanges 19 and 2 are punched out.
Get 0.

[Fifth Embodiment] In the fifth embodiment, the step portion 58 described in the third embodiment is formed on both surfaces of the molded product flange, that is, on the convex surface and the concave surface 19b, 19c, 20c, 20b, respectively. Injection molding. In the molded product flange, if the minimum wall thickness is 70 μm or more, the fluidity of the molten resin deteriorates.
The thickness was reduced by 20 μm from each of b, 19c, 20c and 20b. Further, as shown in FIG.
A corner portion connecting from the step portion 58 on the punch entry surface side to the non-punching member side was rounded to form a rounded portion 59. When punching this molded product flange with a punching machine 50, a punch 51
The cutting edge between the die 52 and the die 52 shears along the step portion 58. The other flange 20 is also punched and formed in the same manner by the punching machine 53.

The flanges 19 and 2 formed in the above embodiments
Table 2 shows the results of examining the ease of attachment to the spool 13 and the generation of abrasion powder using No. 0.

[0052]

[Table 2]

The assembling defect rate shown in Table 2 was obtained by preparing 1,000 flanges obtained by the molding method of each example.
When the flanges are attached to the spool 13, the numbers are those which cannot be attached or the number of which is difficult to attach, which is represented by 1000. The abrasion powder was generated by attaching the flange obtained in each example to the spool 13 to make a photographic film cartridge, rotating the spool 13 and feeding the photographic film 50 times, and then disassembling the photographic film cartridge. Then, the presence or absence of abrasion powder adhering around the spool 13 and the flange was magnified 10 times with a magnifying glass and visually observed.

As can be seen from Table 2, the flanges 19 and 20 of the first embodiment were unsuitable for both the defective assembly rate and the generation of abrasion powder. This is because the pair of flanges 19 and 20 are obtained from one sheet in the same punching direction, and therefore the assembling property is unsuitable due to burrs or burrs formed on the edge of the opening 19a or 20a of one of the flanges 19 and 20 on the flange insertion direction side. And, since there are many abrasion powders,
It is presumed that burrs and burrs project from the thickness contours of the flanges 19 and 20. If the thermoformed sheets are punched separately to obtain the flanges 19 and 20,
It is considered that the punching direction can be adjusted to the inserting direction of the flanges 19 and 20, respectively, so that the defective assembly rate can be reduced to the same level as the flange of the second embodiment.

In the flanges 19 and 20 of the second embodiment, the punching direction is set in the direction opposite to the inserting direction of the flanges 19 and 20, so that the defective assembly rate is considerably reduced, while the abrasion powder is reduced. As shown in FIG. 12, since the burr and the burr 62 protruded from the thickness contours of the flanges 19 and 20, the flanges 19 and 2 of the first embodiment were
As with 0, a lot of abrasion powder was generated. Note that the flanges 19 and 20 of the second embodiment have the fracture surface 60 formed on the sheared cut surfaces of the openings 19a and 20a, so that the flanges 19 and 20 are difficult to attach to some of them. .

In the flanges 19 and 20 of the third embodiment, since the step portion 58 is formed on the side opposite to the punch entrance surface side,
As shown in FIG. 13, the burr and the burr 62 have the flange 1
It was slightly protruding from the thickness contours of 9 and 20. Therefore, the generation of wear debris was considerably reduced. Moreover, as the thickness of the gate land portion to be punched out is reduced, it becomes easier to punch out, the area of the fracture surface 60 generated on the sheared cut surface of the openings 19a and 20a is reduced, and the flanges 19 and 20 are easily attached.

In the flanges 19 and 20 of the fourth embodiment, almost no abrasion powder was generated. This is because the burrs and burrs 62 are formed on the flange 19 and
It is presumed that it does not project from the thickness contour of 20. Further, since the thickness of the gate land portion to be punched is smaller than that of the flange of the third embodiment, it is easy to punch, and the area 60 of the fracture surface generated on the sheared cut surfaces of the openings 19a and 20a is further reduced, and the flange 19 , 20 is easier to install.

In the flanges 19 and 20 of the fifth embodiment, a step portion 58 is provided on each of the concave and convex surfaces 19c, 19b, 20b and 20c, and a corner portion connecting the step portion 58 on the punch entry surface side to the non-punching member side. Rounded part 59
Therefore, as shown in FIG. 14, a part of the rounded portion 59 remains as it is even after punching. Thereby, the fracture surface 60 generated on the shear cut surface of the openings 19a and 20a.
Area was extremely reduced, and the attachability of the flanges 19 and 20 was good. Moreover, since the burrs and burrs 62 do not protrude from the thickness contours of the flanges 19 and 20, the generation of abrasion powder is almost eliminated.

From the above points, with respect to the ease of attaching the flanges 19 and 20, regardless of the molding method, the opening 19
The punching direction when forming a and 20a is the flange 1
It was found that it is important to match the insertion direction of 9, 20 with the opposite direction. Further, it has been found that a great effect can be obtained with respect to the abrasion powder by providing a step portion on the side opposite to the punch entrance surface in accordance with the shear line and reducing the thickness on the punching member side. In this case, since it is difficult to reduce the thickness of only the punching member by thermoforming, it is desirable to form the molded product flange by injection molding. further,
It was found that if the step portions 58 are provided on both surfaces and the corner portion on the punch entry surface side is rounded, the flange can be more easily attached.

As shown in FIG. 15, the step portion 58 has a groove or a concave shape, and the same effect as that of the third embodiment can be obtained. Further, as shown in FIG. 16, if the rounded portions 59 described in the fifth embodiment are molded on both sides of the molded product flange,
Since a part of the rounded portions 59 remains on both surfaces after punching, it is also effective in generating abrasion powder.

In the above embodiment, the rounded portion 5 is formed at the corner portion connecting the step portion 58 on the punch entry surface side to the non-punched portion.
However, the present invention is not limited to this, and even if a chamfered portion that is cut at 45 ° or other than 45 ° is provided, the same effect can be obtained because part of the chamfered portion remains after punching. To be

In the embodiment shown in FIGS. 17 and 18, a spool of a type in which the insertion direction of the flange 19 is opposite to the insertion direction of the above-described embodiment, that is, the concave surface 19c is inserted toward the spool 70, is used. ing. Flange engaging portion 70a for attaching the flange 19 of the spool 70
From the insertion direction side of the flange 19 to the engaging claw 71, the groove 7
2 and the stopper 73 are formed in this order. And
A fan-shaped plate 2 formed separately after attaching the flange 19
7 is attached from the direction orthogonal to the axial direction. In this case, the punching direction is set to be opposite to the insertion direction of the flange 19 (the arrow direction shown in the figure).

[0063]

As described above, in the flange of the photographic film cartridge of the present invention, the punching direction of the punch is opposite to the direction of inserting the flange to form the opening, and therefore the flange is not attached to the spool. It can be done smoothly. Further, according to the invention described in claim 4 , since the step portion is formed on the surface opposite to the punch entrance surface by injection molding so as to reduce the thickness on the punching member side, burrs and burrs caused by punching performed thereafter are formed. Does not significantly protrude from the thickness profile of the flange, so that it is possible to prevent generation of abrasion powder. Further, in the invention according to claim 5 , a step portion having a reduced thickness on the punching member side is formed on both surfaces by injection molding,
Of these stepped portions, the rounded portion or chamfered portion was formed at the corner portion that connects the stepped portion on the punch entry surface side to the non-punched portion.Therefore, burrs and burrs generated by punching performed after that are not so much from the flange thickness profile. Since it does not protrude, abrasion powder can be prevented from being generated, and a part of the rounded portion or the chamfered portion remains on the opening edge on the flange insertion side, so that the spool can be more smoothly mounted.

[Brief description of drawings]

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

2A and 2B are cross-sectional views showing a pair of flanges.

FIG. 3 is an enlarged cross-sectional view of a flange engaging portion to which one flange is attached.

FIG. 4 is an enlarged cross-sectional view of a flange engaging portion to which the other flange is attached.

FIG. 5 is a cross-sectional view of a photographic film cartridge.

FIG. 6 is a cross-sectional view showing a mold for injection molding one flange.

FIG. 7 is a sectional view showing a mold of one flange punching machine.

FIG. 8 is a cross-sectional view showing a mold of the other flange punching machine.

FIG. 9 is a cross-sectional view showing an injection molding die in which a step portion is provided on one surface to thinly form a gate land portion.

10 is a schematic explanatory view showing a punched state of a molded product flange formed by the mold described in FIG. 9. FIG.

FIG. 11 is a cross-sectional view of essential parts showing a punched state of a molded product flange formed by forming a step on both surfaces.

FIG. 12 is a cross-sectional view showing burrs and burrs formed on the opening surfaces of the pair of flanges after punching.

FIG. 13 is a cross-sectional view showing burrs and burrs formed on an opening surface after punching a molded product flange having a step portion formed on one surface.

FIG. 14 is a cross-sectional view showing burrs and burrs formed on the opening surface after punching a molded product flange having stepped portions formed on both surfaces.

FIG. 15 is a cross-sectional view of an essential part showing a molded product flange having a groove shape as a step portion.

FIG. 16 is a cross-sectional view of essential parts showing a punched state of a molded product flange in which a rounded part is molded in a corner part connected to a molded product flange from step portions on both surfaces.

FIG. 17 is a perspective view showing a spool of a type in which flanges are attached from both sides.

FIG. 18 is a cross-sectional view of main parts of the spool described in FIG.

[Explanation of symbols]

13,70 spool 13a, 13b, 70a Flange engaging part 19,20 Flange 19a, 20a opening 19b, 20c convex 19c, 20b concave 33, 36, 71 Locking claw 34, 37, 72 groove 35, 38, 73 stopper 39,59 Injection Mold 40,56 mobile 41 Fixed 51,54 punch 52,55 dice

Front page continuation (72) Inventor Naoyoshi Senno 2-12-1, Ogimachi, Odawara-shi, Kanagawa Fuji Photo Film Co., Ltd. (56) References JP-A-6-11802 (JP, A) JP-A-7-5637 (JP, A) Actual Kaihei 3-11240 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03C 3/00 540 G03C 3/00 590 G03B 17/26

Claims (7)

(57) [Claims] 1. A rotatably housed inside a cartridge,
A spool around which a photo film is wound in a roll shape, and an axial direction on the spool at the center part by punching a punch.
The spool is formed with an opening that is inserted from the direction
Of the above-mentioned rolled photo film.
A pair of flanges that are rotatably supported by
In the provided photo film cartridge, the direction of punching out the opening is opposite to the direction of inserting the flange.
Flan which was punched in the direction of
Is inserted into the flange engaging portion.
Photo film Patrone. 2. A shaft of the spool, wherein the flange engaging portion is provided.
Flang that inserts the flange of the direction into the spool
The flange insertion direction that is provided in order from the insertion direction.
The locking claw with a slope on the upstream side and the flange are rotated.
A groove that supports freely and a slot that regulates the insertion of the flange.
The photograph according to claim 1, wherein the photograph comprises a topper.
Film Patrone. 3. The pair of flanges has a small diameter opening and the opening.
And a large-diameter opening with a diameter larger than
The same direction as the flange insertion direction.
It is inserted into the spool and is arranged along the one direction of the pair of flange engaging portions.
Set the outer diameter of the one flange engaging portion on the upstream side to
Smaller than the large diameter opening in the lunge, and
Formed with a diameter that fits into a small diameter opening on the flange of
The photographic film pack according to claim 1 or 2, characterized in that
Torone. Wherein said flange, the opposite surface to the punch-entering layer by injection molding, and the thickness of the punching member side forming a step portion, then, punched along the punch enters surface stepped opening 4. The photographic film cartridge according to claim 1, wherein the photographic film cartridge is formed. Wherein said flange, on both sides by injection molding, and the step portion having a reduced thickness of the punching member side, rounded corners from the stepped portion of the punch enters surface leads to non-punched portion of these step portions The photographic film cartridge according to any one of claims 1 to 3, wherein the portion or the chamfered portion is formed, and then the punch entrance surface is punched along the step portion to form an opening. 6. A seat rotatably housed in a cartridge.
Photographs from the pool Both sides of the film wound in a roll
The pair of flange engaging parts provided at the ends are arranged in the spool axial direction.
It is rotatably supported on the spool by inserting from
In a method of manufacturing a flange used in a photographic film cartridge having a pair of flanges, a step of forming a molded product flange into a dish-shaped cross section and punching the molded product flange with a punch and inserting the spool in the center part and a punching step of forming an opening, in the punching process, the punching direction of the punch
Insert the flange in the axial direction of the spool into the spool.
A method for manufacturing a flange for use in a photographic film cartridge, wherein the molded product flange is punched out in a direction opposite to a direction of inserting the flange to form the opening. 7. The pair of flanges are the pair of flanges.
One of the engaging parts on the upstream side along the one direction
Through the flange engaging part of the
Of the larger diameter that engages with the other flange engaging part
Engage with the opening and one of the flange engaging parts to open the large-diameter opening.
And a large-diameter opening that is smaller than the mouth
And align the flange insertion direction with the same direction
The spool according to claim 6, wherein the spool is inserted into the spool.
A method for manufacturing flanges used in photographic film cartridges.