JPH095934A - Production of flange for controlling diameter of photographic film roll - Google Patents

Abstract

PURPOSE: To prevent the defective die reproducibility, etc., by using a die provided with plural vacuum holes at the corner reproducing the outer ridge of a flange in vacuum forming. CONSTITUTION: A thin discoid flange is fixed to both ends of a spool shaft as the parts of a photographic film cartridge. The flange is formed by vacuum- forming a thermoplastic resin sheet 40. A female die 47 provided with plural vacuum holes 70 at the corners 63 and 67 reproducing the outer corners 62 and 66 of the flange is used in the vacuum forming. The diameter of the hole 70 is controlled to 0.2-0.5mm, the radius of curvature of the corners 63 and 67 provided with the vacuum holes 70 among the corners 61, 63, 65 and 67 of the die 47 is controlled to 0.2-0.5mm, and the radius of curvature of the corners 61 and 65 not provided with the hole 70 is controlled to 0.1-0.5mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a flange mounted on a spool around which a photographic film is wound, and more particularly to a method for manufacturing a flange for controlling a winding diameter of a photographic film wound around a spool. It is a thing.

[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 loaded into 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,
In order to prevent the photo film from being loosened inside the cartridge body when the spool is rotated, the flanges rotatably attached to both ends of the spool are devised. The above-mentioned pair of flanges is a disk plate for regulating the winding diameter of the photographic film having a dish-shaped cross section. The lip of the photographic film roll is formed by a tongue-shaped lip slightly protruding in a direction facing each other at the outer peripheral edges. By wrapping the outermost circumference, the film is prevented from becoming loose.

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 constantly deformed and rotated, it needs to be thin and have appropriate elasticity.
In order for the flange to have such characteristics, it is necessary to first select a material. Moreover, when selecting this material, it is necessary to consider the molding method. Preferred materials and molding methods taking these two factors into consideration are described in JP-A-4-251841 and JP-A-5-119436. In the materials described in these publications, a thermoplastic resin sheet having a flow index (MI) of 4 or less and a thickness of 0.4 mm or less is softened by heating, thermoformed by vacuum pressure forming, and then punched into inner and outer shapes in a punching step. To form a flange.

[0006]

In the vacuum pressure forming, the compressed air is sent so that the sheet comes into close contact with the mold, and the air remaining between the sheet and the mold is discharged by using a vacuum pump. The sheet is brought into close contact with the mold by the suction force. However, as described above, since the sheet is extremely thin, corners such as ridges and valleys of the molded product are likely to be thin, and rigidity is reduced. Especially, when the rigidity of the corner of the flange, which is a molded product, is lowered, the film winding loosening prevention force by the lip is lowered, and there is a possibility that the photographic film cannot be fed out.

If the air in the mold cannot be exhausted sufficiently during suction, the shape will be partially defective. In addition, since the suction force becomes strong in the portion facing the vacuum hole, cracks or ruptures are likely to occur. When a flange with such a phenomenon is used, if it is rotated inside the cartridge, the defective shape, or the cracked or ruptured portion may be rubbed to cause poor rotation, and the photographic film may not be delivered. there were.

The present invention has been made to solve the above problems. As a first object of the present invention, corners of a molded product are provided with rigidity to secure the feeding force of a photographic film.
A second object is to improve the exhaust capacity of the air in the mold and to make the suction force in the mold uniform to reduce defects such as defective shapes, cracks and ruptures.

[0009]

To achieve the above object, the present invention uses a mold in which a plurality of vacuum holes are provided in a corner portion which reproduces an outer ridgeline of a flange during vacuum forming. If the molded product has a ridge, this part is the last in the process in which the sheet adheres to the mold. Therefore, if vacuum holes are provided in the corners of the mold that reproduce the ridges, the sheet can be firmly attached to every corner of the mold.

As for the size of the vacuum hole, if the size is too small, the suction becomes insufficient, and if the size is too large, the suction becomes too strong and the sheet is damaged. Therefore, the diameter is preferably 0.2 mm or more and 0.5 mm or less. . Further, depending on the rounded shape of the corner portion of the mold, the flexibility of the flange itself changes, resulting in trouble in film feeding. Therefore, a corner portion provided with a vacuum hole is formed to have a radius of curvature of 0.2 mm or more and 0.5 mm or less, and a corner portion provided with no vacuum hole is 0.1 mm.
The radius of curvature is not less than 0.5 mm and not more than 0.5 mm.

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.

Each of the upper and lower cases 11 and 12 has a substantially semi-cylindrical shape, and a port portion 15 is formed to project from a part thereof. Upper case 11 and lower case 12
The light-shielding lid 16 is rotatably fitted into the port portion 15 at the time of fitting. 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 projection 18 is formed behind the port 15 of the lower case 12. The protrusion 18 is provided on the spool 1
3 is a guide for picking up the leading end of the photographic film 14 wound around 3 and guiding it to the film passage 17.

Each of the flanges 19 and 20 has an opening 1
9a and 20a are formed. The spool 13 is fitted into a predetermined position of the spool 13 by inserting the spool 13 into the openings 19a and 20a, and is rotatably mounted on the spool 13. A lip 2 is provided on the outer circumference of the flanges 19 and 20.
1 project from each other so as to face each other, and partially surround the outermost periphery of the photo film 14 wound around the spool 13 from both ends.

When the used display component 23 is fitted into the spool 13, the flange 20 locks the clutch pawl 24 and the locking hole 25 of the flange 20 when the spool 13 rotates in the film feeding direction. Flange 20
Can be forcibly rotated. Further, when the spool 13 is rotated in the film winding direction, the flange 20 can freely rotate without engaging the clutch claw 24 and the engaging hole 25 of the flange 20. Also, the other flange 1
9 remains free to rotate with respect to the spool 13. In addition,
A fan-shaped display plate 23a is integrated with the use display component 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.

Side ribs 26 are provided on the inner walls of the side surfaces of the upper case 11 and the lower case 12, and regulate the flanges 19 and 20 so that they do not spread each other. A fan-shaped plate 27 is fixed to the spool 13, and a data disc 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 data disc label 28 can also be directly provided on the spool 13 by pushing.

The spool lock component 31 locks the spool 13 so that it does not rotate when the light shielding cover 16 is turned to the closed position. This lock is released when the light shielding cover 16 moves to the open position. Reference numeral 32 denotes a lock pole integrally formed with the upper case 11, and the light blocking cover 16 is locked by the lock pole 32 when the cover 16 is turned 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 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.

As shown in FIG. 2, when the photographic film 14 is completely wound inside the cartridge body 10, the outermost periphery 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 walls of the side surfaces of the upper and lower cases 11 and 12 regulate the flanges 19 and 20 so that they do not spread to each other. , Facing side ribs 26
The spacing between them has been increased. For this reason, when the leading edge of the photo film 14 is scooped up by the projection 18 and then the film 19 advances to the film passage 17, the flanges 19 and 20 slightly spread outward, and the photo film 14
A gutter-shaped curl is made and sent out from between the two.

The same effect can be expected even if the side ribs 26 are provided on only one side. Further, as a method for releasing the film winding looseness of the lip 21, a pair of separation claws are provided on both sides in the film width direction, and the pair of separation claws are partially directed outward in a direction away from each other by the outer surfaces of the pair of separation claws. You may make it always deform.

When the above-mentioned photographic film cartridge is loaded into 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. Thereafter, the spool 13 is driven in the feeding direction, and feeding of the photographic film 14 is started. Lip 2 formed on the outer periphery of flanges 19 and 20
Since the photo films 14 prevent the photo film 14 from being loosened, the photo film 14 rotates together with the spool 13. During this rotation, the leading end of the photographic film 14 is picked up by the projection 18 and guided to the film passage 17.

When the leading end of the photo film 14 is guided to the film passage 17 in this way, the lips 21 and 21 are pushed out on both sides by the photo film 14, so that the wrapping of the photo film 14 at the back of the film passage 17 is released. Since one of the flanges 20 is forcibly rotated in the feeding direction by the engagement between the clutch pawl 24 and the locking hole 25, the force for feeding the photographic film 14 is increased.
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 expanded in the back of the film passage 17, and the photographic film 14 is drawn between the flanges 19 and 20 and wound around the spool 13.

As shown in FIGS. 3A and 3B,
The flanges 19 and 20 are similar in outline shape to each other, but the step height C of the flange 20 is slightly longer than the step height B of the flange 19. Opening 19
a and 20a are surfaces 38 for aligning both ends of the photographic film 14.
It is formed on the surface 39 which is recessed by one step. Lip 21
On the outer periphery of the surface 38, the other flanges 19 and 2 respectively.
The photographic film 14 is projected so as to face 0, and the outermost periphery of the photographic film 14 wound on the spool 13 is partially wrapped from both end surface sides. The lip 21 has a cross section whose tip is slightly inclined inward.

A flange 22 is integrally provided on the outer periphery of the lip 21. The flange 22 functions to reinforce the lip 21 so as not to spread. In addition, in order to have a function of guiding the photographic film 14 to easily enter the inside of the lip 21 when the film is rolled in,
The flange 22 has a cross-sectional shape that is inclined so that the tips of the opposing surfaces 22a are separated from each other.

The flanges 19 and 20 have physical properties of tensile modulus of 80 kg / mm ² or more and 250 kg / mm ² and M
I (melt index) is formed by vacuum-pressure forming a thin sheet of a thermoplastic resin of 4 or less. As such a sheet, thermoplastic resins such as polystyrene-modified polyphenylene ether, polyamide-modified polyphenylene ether, polycarbonate, polypropylene, polyester, polystyrene, and polyvinyl chloride can be used.

As shown in FIG. 4, the apparatus for manufacturing the flanges 19 and 20 comprises a mounting portion 41 for the rolled sheet 40, a heating portion 42, a clamp mechanism 43, a molding portion 44, a trimming portion 45, and the like. Has been done. The roll-shaped sheet 40 set on the attachment portion 41 is pulled out in a band shape while being clamped by the clamp mechanism 43, and is sent to the heating portion 42 and the molding portion 44.

The heating section 42 heats the portion of the sheet 40 drawn by the pair of drawing rollers 37, which is to be clamped by the clamp mechanism 43, by the upper and lower heater plates to facilitate clamping. The clamp mechanism 43 is a chain system that clamps both ends of the seat 40 in the width direction with a chain,
The sheet 40 is provided with sharp-angled protrusions provided at predetermined intervals on the chain.
The sheet 40 is firmly held when it is molded and is supported so as not to fall off. The clamp mechanism 43
As an alternative, the upper clamp may be provided with acute-angled projections at predetermined intervals, and the lower clamp may be provided with recesses that fit into the projections to break through and hold the sheet.

The seat 4 is moved by moving the chain clamp.
0 is sent to the molding unit 44. In the molding unit 44, the heating plate 46 is lowered, the sheet 40 is sandwiched between the heating plate 46 and the mold 47, and the inside of the mold 47 is put into a pressurized state to bring the sheet 40 into close contact with the heating plate 46. When the sheet 40 reaches the forming temperature, the vacuum pump 48 is operated to evacuate the air inside the mold 47 from the many vacuum holes of the mold 47, and at the same time, the compressed air device 49 is operated to compress the air from the many small holes of the heating plate 46. Are injected to form the sheet 40. After the formation is completed, the mold 47 is retracted and the mold is removed. The forming temperature of the sheet 40 is the same as that of the heating plate 4.
It is determined by the temperature of 6 and the heating time.

The mold 47 is a multi-cavity mold,
Multiple shots are made in one shot. The sheet 40 is intermittently transferred by a length corresponding to one molding and sent to the trimming section 45. In the trimming portion 45, only the area formed by one shot is punched out and the portion held by the clamp mechanism 43 is removed. The punched sheet 40a is
It is stored in the storage unit 50. Punched sheet 40 accumulated
The a is conveyed to another punching machine 52, where the inner and outer shapes of the flanges 19 and 20 are punched. Reference numeral 51 is a scrap recovery unit.

[0031]

EXAMPLE Since the mold 47 of this example is a female mold as shown in FIG. 5, the outside of the flange of the molded product is reproduced. As a material of the mold 47 used for the molding portion 44, a metal material is preferable because it is required to have accuracy for preventing leakage of compressed air and strength enough to endure mass production. As a metal, iron is rusty and maintenance management is difficult, and aluminum duralumin is suitable because it is easy to process. In general, duralumin has a soft surface and is likely to be scratched on the surface after repeated molding. Therefore, in this example, super duralumin having a high hardness, and more preferably ultra super duralumin, was adopted.

The mold 47 includes a combination type and an integral type.
The combination type is made by combining a plurality of blocks, and the combination part has 0.2 parts to exhaust the internal air.
A slit-shaped vacuum groove of about 0.4 mm is provided.
However, in the combination type, positioning of blocks is required to be accurate, and if the positioning is not done accurately, the gap between the vacuum grooves will vary and the suction force will change, resulting in a vacuum groove with a strong suction force. There is a risk that specific protrusions, ruptures, etc. will occur on the part. Therefore, in this embodiment, the mold 47 used for the molding unit 44 is integrated and a large number of vacuum holes 70 are provided in the mold 47.

As a position for forming the vacuum hole 70, the mold 4 is used.
If it is formed on the flat surface of No. 7, air will be trapped during suction, resulting in defective molding. Therefore, the corner portions 61, 63, 65, which reproduce the outer ridge lines and the valley lines of the flanges 19, 20,
Of the 67, the last portion of the sheet 40 in close contact with the mold 47, that is, the ridges 62,
It was found that when the corners 63 and 67 of the mold 47 for reproducing 66 are formed, the sheet 40 surely comes into contact with every corner of the mold 47 at the time of molding, and the mold reproduction is good.

The number and size of the vacuum holes 70 are factors that greatly affect the exhaust capacity during molding. Therefore, the mold 47
Table 1 shows the results of an experiment conducted by changing the number and size of the vacuum holes 70 so that the suction force inside the chamber becomes constant in calculation. Since the vacuum hole 70 is made of metal, the vacuum hole 70 is formed by the simplest drilling such as drilling.

The sheet 40 used in the experiment is 100 parts of polystyrene-modified polyphenylene ether (PPE),
A styrene-butadiene-based elastomer was added in an amount of 15 parts and a film having a thickness of 0.15 mm was formed by an extrusion film forming machine. In the molding unit 47, the heating plate 16 is controlled to a temperature of 215 ° C. to heat the sheet 40 for 3 seconds, and the molding time is set to 3 seconds as a standard, and the molded ridge lines and valley lines 60, 62, When the radius of curvature of 64 and 66 is small,
Increase the temperature and time, adjust the compressed air and suction, and mold 4
It was adapted to the shape of 7.

[0036]

[Table 1]

The number of mold reproduction defects and bursts shown in Table 1 is
The number of the vacuum holes 70 and the size of the vacuum holes 70 changed for each embodiment are used to form the mold 47.
And each of these molds 47 is used to form 1000
This is the number of results obtained by molding individual molded products and performing visual inspection. Ultra-duralumin was used as the material for the mold 47.

In the experiment, the number and size of the vacuum holes 70 are changed so that the suction force inside the mold 47 becomes constant in the calculation, but as shown in Table 1, the diameter of the vacuum holes 70 is 0. Two
In Comparative Example 1 in which the size is mm, it is possible to presume that poor mold reproduction occurred and suction inside the mold 47 was insufficient. Therefore, the number of the vacuum holes 70 was increased, but the mold reproduction failure occurred as in the experimental result of Table 1. Moreover, forming the vacuum hole 70 with a diameter of 0.2 mm is not possible with the mold 47.
Since the material of the above is ultra duralumin, the drill blade was easily broken during the drilling work, which was extremely difficult. Further, it was also found that by repeating the molding for a long time, the vacuum hole 70 was easily clogged with dust or the like, and a mold reproduction failure occurred.

On the contrary, in Comparative Example 2 in which the diameter of the vacuum hole 70 was 0.7 mm, rupture occurred, and it can be estimated that the suction of the vacuum hole 70 is too strong. Judging from the above results, in the present embodiment, the diameter of the vacuum hole 70 of the mold 47 is set to 0.
It is preferable that the thickness is 2 mm or more and 0.5 mm or less, preferably 0.3 mm or more and 0.5 mm or less.

Next, the corner portion 6 in which the vacuum hole 70 is formed
3, 67 and the corner portion 6 where the vacuum hole 70 is not formed
In order to give rigidity to the ridge lines and the valley lines 60, 62, 64, 66 of the molded product flanges 19, 20, which are reproduced with 1, 65, the radii of curvature of these corner portions 61, 63, 65, 67 are shown in Table 2. Experiments were conducted by changing the dimensions to those shown in (1) and the optimum dimensions were determined. The same material as that described above was used as the sheet 40.

[0041]

[Table 2] (Unit: mm, all values are radius of curvature dimensions.)

The corner portion 61 shown in Table 2 reproduces the outer valley line 60 between the flange 22 and the lip 23 of the molded product flanges 19 and 20. The corner portion 63 also reproduces the outer ridge 62 between the lip 23 and the face 38 of the molded product flange 19, 20. Furthermore, the corner portion 65 is
The outer valley line 64 connecting the face 38 between the faces 38 and 39 of the molded part flanges 19, 20 is reproduced. Furthermore, the corner portion 67 reproduces the outer ridge line 66 connected to the surface 39 of the molded product flange 19, 20. And the vacuum hole 70
The corner portions provided with are the reference numerals 63 and 67, and the corner portions not provided with the vacuum holes 70 are the reference numerals 61 and 65.

[0043]

[Table 3]

In the film durability test shown in Table 3, a photographic film cartridge was assembled using the flanges 19 and 20 formed in each example, and the film was repeatedly fed by the feeding tester to feed the film. It is a value obtained by measuring the number of times until it cannot be performed, and a value of 300 times or more is necessary in terms of the quality of the molded product flanges 19 and 20. In this test, a support of a polyethylene naphthalate material having a width of 24 mm and a thickness of 90 μm was coated with Fuji Color Super G (trade name) photosensitive emulsion having a thickness of about 15 μm, and an abrasive was mixed on the other surface of the support. The photographic film 14 coated with the magnetic recording layer was used, and the length was such that 40 screens could be projected when the screen size formed by the aperture of the camera was set to 17 mm × 31 mm.

Further, the feeding tester has a spool 13 of 40
It has the ability to rotate at 0 rpm and deliver the photographic film 14 at a speed of 130 cm / min. The speed at which the spool 13 is rotated when the photo film 14 is wound is 800 rpm.

The film feeding force shown in Table 3 is such that a load cell is arranged at the film inlet / outlet, and the spool 13 is rotated in the film feeding direction at room temperature and normal humidity to feed the photographic film 14 to the outside of the cartridge main body 10 by 17 cm. In addition, the pressing force at the tip of the photographic film 14 is the maximum value measured by the load cell, and a value of 400 g or more is required in terms of the specifications of the photographic film cartridge.
The material and shape of the photographic film 14 were the same as those used in the film durability test.

From the results of Table 3, the corner portion 6 of the mold 47
In Comparative Example 2 and Comparative Example 4 in which the curvature radii of 1, 63, 65, 67 were 0.7 mm, the criteria of the film durability test could not be satisfied, and the corner portions 61, 65
It was found that in Comparative Example 1 and Comparative Example 3 in which the radius of curvature of No. 2 was 0.05 mm and the radius of curvature of the corner portions 63 and 67 was 0.15 mm, the standard of the film feeding force could not be cleared. Therefore, in this embodiment, the vacuum hole 7
The radius of curvature of the corners 63 and 67 provided with 0 is 0.2 to 0.5 mm, and the radius of curvature of the corners 61 and 65 not provided with the vacuum holes 70 is 0.1 to 0.5 mm.
It is preferably formed as follows.

In vacuum pressure forming, the production efficiency is improved by using a multi-cavity mold. When using a multi-cavity mold, generally display the cabinet number to identify which of the multiple molds in the mold was used as a countermeasure when a complaint occurs in the molded product. It is known to keep. The cabinet number is not limited to the display for identifying multiple molds of the multi-cavity mold, and is used as a display for identifying which line of the mold is used when there are multiple flange manufacturing lines. To be

It is preferable from the standpoint of mold processing cost to form such a cabinet number by engraving it in a mold and projecting it from the contour of the molded product, while protruding from the contour of the molded product. Therefore, depending on the place to be displayed, the inside of the cartridge main body 10 is rubbed and worn to cause a defect such as rotation failure, and this abrasion causes powder to be sent out from the cartridge main body 10 together with the photographic film 14. , There is a risk that the camera will be polluted and may be included in the image. Therefore, the optimum position and form for displaying the cabinet number will be selected below.

The cabinet number is displayed on the outside of the flanges 19 and 20 because it is formed by the female die 47 used at the time of molding. As the outer flat portion, the valley line 6 shown in FIG. 5 is used.
The plane portion 71 between 0 and the ridge line 62, the ridge line 62 and the valley line 64
Plane portion 72 between and the plane portion 7 connected to the ridge line 66.
There is 3. Of these, the flat surface 71 includes the lip 23 and the collar 22.
Flexibility will be affected. Further, the flat surface 73 may come into contact with the spool 13 and cause a rotation failure. Plane 72
Is a surface with which the rib 26 provided inside the cartridge main body 10 comes into contact, but there is a range in which the rib 26 does not slightly contact as shown in FIG. Therefore, as shown in FIG. 6, the cabinet number is displayed in this circumferential range.

As the cabinet number, numbers, characters, etc. are generally displayed, and it is desirable to display in a size that can be surely recognized from the appearance. However, as shown in FIG. 6, since the range in which the cabinet number is displayed is narrow, when numbers and characters are displayed in this range, it is considerably small and may not be easily recognized from the appearance. Further, if the entire area is displayed, there is a risk of contact with the rib 26. Therefore, the display form of the cabinet number is not a number, but, for example, as shown in FIG. 7, a ridge portion 80 protruding along the circumferential direction is displayed, and the length of the ridge portion 80 along the circumferential direction is displayed. Is displayed in association with each number depending on the difference between and.

When reproducing the protrusion 80 on the mold 47,
Since it suffices to shave a groove along the circumferential direction with a drill (including an end mill) to form a groove, it is preferable in terms of cost and work. Further, the depth of this groove is 0.2 m so that the sheet 40 can be firmly adhered without forming the vacuum hole 70.
It is desirable to set m. Further, the width of the groove along the radial direction is preferably 0.3 mm. With this width, even if the mold 47 is made of a duralumin material having high hardness, it can be easily cut with a drill.

Further, both end portions along the circumferential direction of the projection 80 are provided at the corner portions along the circumferential direction of the groove of the mold 47 so that they can be overcome even if they come into contact with each other inside the cartridge main body 10. Is preferably formed with a radius of curvature of 0.3 mm.

The above embodiment belongs to a sheet forming method in which a sheet of thermoplastic resin is used to form the flanges 19 and 20. Among them, the vacuum pressurization using auxiliary compressed air is used, but the present invention is not limited to this, and simple vacuum forming without using compressed air may be used. Further, in the present invention, the mold used at the time of molding is limited to the female mold. This is because when vacuum forming is performed using a male die, the flanges 19 and 20 whose male die surface contacts the photographic film 14 are formed.
This is because if the inside of the sheet is reproduced and a mark is left on this inner surface, the photographic film 14 may be adversely affected.

Further, in the present invention, a construction other than the above-mentioned photographic film cartridge may be used. Representative examples of various structures preferably used in the present invention are described below. However, the present invention is not limited to this, and can be used in combination with any known configuration. For example, various color light-sensitive materials such as a general or movie color negative film, a slide or television color reversal film, a color paper, a color positive film, and a color paper can be applied. In addition, Japanese Examined Patent Publication No. 2-32615 and Japanese Utility Model Publication No. 3-3978.
It can also be applied to the lens-fitted film unit described in Japanese Patent Publication No.

The emulsion light-sensitive material (silver halide light-sensitive material) of the photographic film 14 carrying a magnetic recording layer is described in JP-A-6-
No. 35118, JP-A No. 6-17528, and JIII Journal of Technical Disclosure 94-6023.
Pre-heat treated polyester thin layer support, eg, polyethylene aromatic dicarboxylate based polyester support, 50-300 μm, preferably 50-200 μm.
m, more preferably 80 to 115 μm, and particularly preferably 85 to 105 μm, is heat-treated (annealed) at a temperature of 40 ° C. or higher and a glass transition point temperature or lower for 1 to 1500 hours to obtain Japanese Patent Publication Nos. 43-2603 and 43-43. 2604, UV irradiation described in JP-B-45-3828, JP-B-48-5
043, JP-A-51-131576, corona discharge, JP-B-35-7578, JP-B-46-434.
Surface treatment by glow discharge described in No. 80, undercoating described in US Pat. No. 5,326,689, and if necessary, undercoating described in US Pat. No. 2,761,791. A pulling layer is provided and disclosed in JP-A-59-23505.
The ferromagnetic particles described in JP-A-4-195726 and JP-A-6-59357 may be applied. In the magnetic layer, silica particles (0.3 μm) and 3-poly (weight content 1
5) Abrasive aluminum oxide (0.15 μm) treated and coated with oxyethylene-propyloxytrimethoxysilane (15% by weight) was added so as to be 10 mg / m ² .

The above-mentioned magnetic layer is disclosed in Japanese Patent Laid-Open No. 4-12.
The stripe shape described in Japanese Patent No. 4642 and Japanese Patent Application Laid-Open No. 4-124645 may be used. Further, if necessary, an antistatic treatment described in JP-A-4-62543 is carried out, and finally a silver halide emulsion is coated to be used. The silver halide emulsions used herein are described in JP-A-4-16693, JP-A-3-41436, and JP-A-3-4143.
The one described in Japanese Patent No. 7 is used.

The sensitive material produced in this manner is Japanese Patent Publication No. 4-8681.
It is manufactured by the manufacturing control method described in Japanese Patent Publication No.
Preferably, the manufacturing data is recorded by the method described in JP-A-146-146. After or before that,
According to the method described in Japanese Patent Application Publication No. 60-160, a film is cut into a film having a width smaller than that of the conventional 135 size, and a perforation is perforated in two holes per small format screen so as to match a small format screen smaller than the conventional one.

The film thus produced is disclosed in Japanese Patent Laid-Open No. 4-1.
No. 57459, a cartridge (patrone) package, a cartridge shown in FIG. 9 of an embodiment of JP-A-5-210202, or U.S. Pat. No. 4,221,47.
No. 9, specification of film patrone and US Pat.
4,306, U.S. Pat. No. 4,834,366, U.S. Pat. No. 5,226,613, and U.S. Pat. No. 4,846,418. .

The film cartridge or film cartridge used herein is described in US Pat. No. 4,848,693.
No. 5,317,355, a type capable of storing a tongue is preferable from the viewpoint of light shielding properties. Further, a cartridge having a lock mechanism as described in U.S. Pat. No. 5,296,886, a cartridge in which a use state described in U.S. Pat. A cartridge having an exposure preventing function is preferable. Also, JP-A-6-85128
As described in the publication, a cartridge to which a film can be easily mounted simply by inserting the film into the cartridge may be used.

The film cartridge thus produced can be used for the purpose of photographing, developing, and enjoying various photographs by using a camera, a developing machine, and a laboratory device described below. For example, JP-A-6-8886 and JP-A-6-9.
A simple loading type camera described in Japanese Patent No.
-57398, JP-A-6-101135, and an automatic winding type camera and JP-A-6-205690.
A camera capable of taking out and exchanging film types in the middle of shooting described in JP-A-5-293138 and information at the time of shooting described in JP-A-5-293138 and 5-283382, for example, panorama shooting, high-vision shooting, normal shooting A camera capable of magnetically recording (a magnetic recording capable of selecting a print aspect ratio) on a film and Japanese Patent Laid-Open No. 6-101194
If a camera having a double exposure prevention function described in Japanese Patent Laid-Open No. 5-150577 or a camera having a usage status display function such as a film described in Japanese Patent Laid-Open No. 5-150577 is used, the function of a film cartridge (patrone) can be sufficiently exhibited.

The film thus photographed is processed by the automatic developing machine described in JP-A-6-222514 and JP-A-6-222545, or before or during or after the processing. -95265, JP 4-12
The method of utilizing magnetic recording on a film described in Japanese Patent No. 3054 may be used, or the aspect ratio selection function described in Japanese Patent Application Laid-Open No. 5-19364 may be used. In the case of cine type development processing, splicing is performed by the method described in JP-A-5-119461. At the time of or after the development processing, an attach / detach processing described in JP-A-6-148805 is performed.

After processing in this way, Japanese Patent Laid-Open No. 2-184
The film information may be converted into prints through back printing and front printing on color paper by the method described in Japanese Patent Application Laid-Open No. 835, Japanese Patent Application Laid-Open No. 4-186335, and Japanese Patent Application Laid-Open No. 6-79968. Further, Japanese Unexamined Patent Application Publication No.
It may be returned to the customer together with the index print and the return cartridge described in JP-A No. 353/1993 and JP-A-5-232594. Furthermore, Japanese Patent Application No. 5-32719
The film image input device disclosed in Japanese Patent Application No. 4 and Japanese Patent Application No. 6-9063 may be used.

[0064]

As described above, according to the present invention, since a mold having a plurality of vacuum holes at the corner portion that reproduces the outer ridge of the flange is used at the time of vacuum forming, the sheet is firmly adhered to every corner of the mold. Therefore, it is possible to prevent the occurrence of defective mold reproduction.

In another invention, since the diameter of the vacuum hole is set to 0.2 mm or more and 0.5 mm or less, it is possible to surely prevent defective mold reproduction due to insufficient suction and damage to the sheet due to excessive suction force. Can be prevented. Further, since the corner portion provided with the vacuum hole is formed to have a radius of curvature of 0.2 mm or more and 0.5 mm or less, and the corner portion not provided with the vacuum hole is formed to have a radius of curvature of 0.1 mm or more and 0.5 mm or less. Rigidity can be given to the outer ridge of
It is possible to secure the feeding force of a predetermined photographic film.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an example of a photographic film cartridge.

FIG. 2 is a sectional view of a photographic film cartridge.

FIGS. 3A and 3B are cross-sectional views showing a pair of flanges.

FIG. 4 is an explanatory view schematically showing a flange manufacturing apparatus.

FIG. 5 is a sectional view of a mold for vacuum forming.

FIG. 6 is a plan view showing the outside of the flange.

FIG. 7 is an explanatory diagram showing an example in which numbers are formed by the lengths of the protrusions and combinations thereof and are associated with cabinet numbers.

[Explanation of symbols]

19, 20 Flange 40 Sheet 47 Type 48 Vacuum device 49 Pneumatic device 60, 64 Flange outer valley line 62, 66 Flange outer ridge line 61, 63, 65, 67 Corner part of mold that reproduces ridge line and valley line 70 Vacuum hole 80 Projection Section

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location B29L 31:00

Claims (3)

[Claims] 1. A method for forming a flange attached to a spool around which a photographic film is wound in a roll by vacuum forming, wherein in the vacuum forming step after heating a thermoplastic resin sheet to a forming temperature, A method of manufacturing a roll diameter regulating flange for a photographic film, characterized in that a mold having a plurality of vacuum holes provided in a corner portion for reproducing an outer ridge is used. 2. The vacuum hole having a diameter of 0.2 mm or more and a diameter of 0.2 mm or more.
The method for manufacturing a roll diameter regulating flange of a photographic film according to claim 1, wherein the flange is 5 mm or less. 3. The mold has a corner portion that reproduces the outer ridgeline and the valley line of the flange and is provided with a vacuum hole, and has a radius of curvature of 0.2 mm or more and 0.5 mm or less. 0.1 mm for corners without
The method for manufacturing a roll diameter regulating flange of a photographic film according to claim 1 or 2, wherein the radius of curvature is 0.5 mm or less.