JP3165334B2 - Photo film spool - 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 spool, and more particularly, to a photographic film spool that can be easily mounted on a photographic film.

[0002]

2. Description of the Related Art As disclosed in U.S. Pat. No. 5,025,274, a photographic film cartridge having a function of assembling a patrone body with a resin molded product and sending out the photographic film to the outside of the patrone body by rotating a spool is known. It is.

A pair of flanges are attached to both ends of the spool. Lips are formed integrally on the outer peripheral edges of the pair of flanges, and these lips wrap around the outermost peripheral ends of the photo film when the spool rotates in the photo film feeding direction, and loosen the photo film. And the rotation of the spool is transmitted to the outermost periphery of the photo film.

Meanwhile, in a photographic film cartridge using a flange with a lip in order to prevent the photographic film from becoming loose, it is necessary to make the diameter from the center of the spool shaft to the outermost periphery of the photographic film wound around the spool constant. is there. However, since there are types of photo films having different lengths depending on the number of images that can be taken, spools having different shaft diameters are used according to these types.

On the other hand, a slit is formed in the spool of the spool to lock the rear end of the photo film.
Inside the slit, a locking claw that engages with a hole formed at the rear end of the photo film and a holding rib for pressing the photo film against the locking claw side are opposed to each other from the vertical direction. It protrudes and is provided shifted in the axial direction.

A method for winding a photographic film around a spool having such a slit is disclosed in JP-A-6-35.
No. 123 is proposed. According to this method, an insertion member which can freely enter and exit the patrone main body through a film passage of the pre-assembled patrone main body is used, and the rear end of the photographic film is held at the front end of the insertion member. Then, the photographic film is passed through the film passage of the patrone main body together with the insertion member, and the rear end is inserted into the slit of the spool to be locked by the locking claw. Thereafter, the insertion member is pulled out of the patrone body, and the spool is driven in the direction in which the photographic film is wound, so that the photographic film is wound into the patrone body while being wound around the spool.

When the photo film and the insertion member are inserted into the slit by this method, since the locking claw and the pressing rib prevent the photo film from entering, the photo film and the insertion member are deformed by the insertion force of the insertion member. There is a possibility that the subsequent film locking force may be reduced. Therefore, in order to prevent the deformation of the photo film and the insertion member during insertion without lowering the locking force of the film, the upper center of the inner wall of the winding part, which forms the slit, is cut out to the outer periphery of the shaft, and the cut sides are elastic. A spool having a flexible holding rib is proposed in Japanese Patent Application No. 5-49665.

[0008]

In consideration of changing the shaft diameter of the spool having such a holding rib according to the type of the photo film, the position of the slit is reduced due to the automatic insertion of the photo film. Must be kept constant. Also, if the thickness of the holding rib is changed, the displacement amount of the holding rib and the pressing force of the holding rib change, so that both sides of the winding shaft portion provided with the holding rib (hereinafter, referred to as Only the diameter of the "large diameter part" can be changed.
For this reason, the supporting area of the large-diameter portion supporting the innermost periphery of the photo film to be wound cannot be widened along the axial direction of the winding shaft portion.
Therefore, when the photographic film is wound tightly, both ends or one end of the photographic film fall off from the large-diameter portion to the holding rib which is recessed one step, and there is a disadvantage that the photographic film is damaged by a fold.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and maintains the function of a holding rib for easily mounting a photographic film without lowering the film locking force, and according to the type of photographic film. It is an object of the present invention to provide a photographic film spool capable of easily changing the shaft diameter.

[0010]

In order to achieve the above object, the present invention provides a slit formed in a winding shaft, a locking claw provided inside the slit for locking a photographic film, and A pair of elastic holding ribs projecting into the slit to prevent the photo film from dropping from the locking claw, and from a height position projecting radially of the winding shaft from a base side base of these holding ribs. And a support piece projecting so as to oppose each other along the axial direction of the winding shaft, and supporting both ends of the innermost circumference of the photographic film to be wound. According to this, after engaging the locking hole formed in the rear end portion of the photo film with the locking claw of the slit to lock the photo film, the winding shaft is rotated in the photo film winding direction to rotate the photo film. If the film is wound around the outer periphery of the support piece, the displacement amount and the locking force of the holding rib can be maintained as they are.

Further, the support piece is supported at both ends of the innermost periphery of the photographic film. However, if the support piece supports a predetermined photographing screen in the width direction of the photographic film, the photographic property is reduced due to scratches or the like. Support the innermost ends of the photographic film with a length corresponding to the area other than the scheduled shooting screen in the length of the projection direction of the, and form the outer peripheral surface on the leading end side by one step from this to prevent the photographic film from falling off It is possible to prevent both the scratch and the like on the scheduled shooting screen. The function of the support piece is as follows.
In addition to supporting the innermost ends of the wound photo film,
It may be a support piece for preventing the innermost peripheral ends of the wound photo film from falling off.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a photographic film cartridge 10 has a photographic film 1 inside a patrone main body 11.
The photographic film 13 is sent out of the cartridge body 11 from its leading end by rotating the spool 13 in the photographic film sending direction.

The patrone main body 11 is composed of an upper case 14 and a lower case 15 made of an integrally molded resin product.
The lower cases 14 and 15 are removably attached by four engaging claws 16 provided on the lower case 15, and a label 17 is attached to the outer periphery of these.

The inside of the patrone body 11 is an information room 18,
It is partitioned into three rooms, a film room 19 and a display room 20, and a film passage 21 for sending out the photographic film 12 is formed on the joint surface between the upper and lower cases 14, 15. The film passage 21 is provided with a cover member 22 for preventing light from entering therefrom, and a separation claw 23 disposed behind the cover member 22 for separating the leading end of the photographic film 13. The cover member 22 has keys 24 and 25 formed at both ends thereof, and the film passage 21 is formed by the rotation of a camera-side opening / closing drive shaft which engages with the key grooves 24 and 25 when the cover member 22 is mounted on the camera. It is pivoted between a closing position to close and an opening position to open.

The spool 13 is composed of a winding shaft 26, a pair of flanges 27 and 28, and a rotating member 29, all of which are integrally molded from resin. Reel 2
6 has both ends exposed on both side surfaces of the patrone main body 11, and these exposed surfaces are formed with key grooves 30, 31 with which a drive shaft on the camera side engages when the camera is mounted on the camera. ing.

The winding shaft 26 has a data plate 32 and a pair of receiving flanges 33, 3 for mounting a flange in order from one end side.
4 and a rotating member supporting portion 35 are integrally formed, and more specifically, a pair of flanges 27 and 28 and a rotating member 29 are attached as shown in FIGS.
When this spool 13 is incorporated into the cartridge body 11,
The flanges 27 and 28 are accommodated in the film room 19 together with the photographic film 12, the data plate 32 is accommodated in the information room 18, and the rotating member 29 is accommodated in the display room 20, respectively.

The rotating member 29 is integrally formed with a disk 52 provided with a ratchet claw 51, a gear 53, and a display plate 54, which rotate integrally with the winding shaft 26.

On the outside of the data plate 32, an adhesive label 56 is provided.
Is affixed. On the outside of the adhesive label 56, for example, a bar code 56a indicating the type of the photo film or the like is printed. When the spool 13 is rotated in the direction in which the photo film is fed out, the bar code 56a
The image is read by a reading sensor provided on the camera side through a reading opening 57 formed on the side surface of the camera 4.

The display plate 54 rotates integrally with the winding shaft 26 behind a plurality of display windows 50 provided on the side surfaces of the upper and lower cases 14 and 15 on the display room 20 side, and the rotation of the winding shaft 26 is controlled by rotation control. Depending on which of the display windows 50 is exposed, a state such as whether the photographic film 12 stored in the patrone main body 11 has been exposed and whether it has been developed is displayed.

A spool lock 80 is movably housed inside the display chamber 20 so as to mesh with the gear 53. When the lid member 22 is in the closed position, the spool lock 80 is engaged with the gear 53 to lock the rotation of the reel 26, preventing unintentional feeding of the photographic film. When in the open position, the engagement with the gear 53 is released.

The pair of flanges 27 and 28 have elasticity, and the opening 5 inserted through the winding shaft 26 is formed at the center of the dish-shaped cross section.
8 and 59 are respectively formed, inserted into the winding shaft 26 from one direction, and rotatably attached to the pair of receiving flanges 33 and 34.

In the flange 28, four holes 60 are formed at a predetermined pitch along a circumferential direction of a peripheral wall 52 orthogonal to the axial direction of the winding shaft 26. These holes 60
Is engaged with the ratchet pawl 51 of the rotating member 29 when the winding shaft 26 rotates in the photographic film feeding direction. The ratchet pawl 51 transmits the rotation of the winding shaft 26 to the flange 28 when engaged with the hole 60, and the winding shaft 26 rotates in the photo film winding direction (the direction opposite to the photo film feeding direction). In this case, the rotation of the winding shaft 26 is not transmitted to the flange 28 because the hole is not engaged with the hole 60.

Lips 61 and 62 are integrally formed on the outer peripheral edges of the pair of flanges 27 and 28, respectively. These lips 61 and 62 wrap the outermost ends of the photographic film 12 when the winding shaft 26 rotates in the photographic film feeding direction, and transmit the rotation of the winding shaft 26 to the outermost circumference of the photographic film 12. The film 12 is prevented from becoming loose. When the photographic film 12 is taken up, the lip 62 of the photographic film 12 slides with the photographic film 12 because the flange 28 does not rotate, thereby preventing the photographic film 12 from loosening.

When the winding shaft 26 is rotated in the direction in which the photographic film is fed, the leading end of the photographic film 12 is separated by the separating claw 23 toward the film passage 21.
At this time, since the leading end of the photographic film 12 has a narrow width, it can escape from the wrapping of the flanges 27 and 28 by the lips 61 and 62. Thereafter, since both ends of the photo film 12 push the lips 61 and 62, the photo film 12 is sent out of the cartridge body 11 through the film passage 21.

The winding shaft 26 is injection-molded with a flexible plastic material as shown in detail in FIGS. For this reason, a plurality of recesses and grooves are formed along the direction in which the mold is removed in order to make the wall thickness uniform.
These recesses and grooves not only strengthen the winding shaft 26 in terms of strength, but also contribute to preventing waving and other deformation.

Inside the pair of receiving collars 33, 34, cylindrical large diameter portions 36, 37 for supporting both innermost ends of the photographic film 12 to be wound are integrally formed. A space between them forms a winding shaft for winding the photographic film 12. The winding shaft portion includes upper and lower shaft portions 38 and 39, and a slit 40 is formed between the upper and lower shaft portions 38 and 39. The upper shaft portion 38 is notched at the center, and both sides of the notch are bent toward the inside of the slit 40 to form a pair of resilient holding ribs 41 and 42. Since the holding ribs 41 and 42 are formed integrally with the winding shaft 26, they can move up and down by elasticity and are displaced by 1 mm or more with a load of 200 g. In the slit 40 of the lower shaft portion 39, a pair of locking claws 43, in a direction facing the holding ribs 41, 42 and at a position wider than the bent portions 41 a, 42 a of the holding ribs 41, 42. 44 is integrally formed.

The large diameter portions 36 and 37 are provided with holding ribs 41 and 4 respectively.
In order to maintain the function 2, the width of the winding shaft 26 along the axial direction is narrow. Therefore, the supporting area for supporting the photographic film 12 is small, and when the photographic film 12 is firmly wound around the winding shaft 26, both ends or one end of the photographic film 12 may fall off. Therefore, a pair of support pieces 45 and 46 are integrally formed on the outside of the pair of holding ribs 41 and 42 so as to face each other from the large diameter portions 36 and 37 along the axial direction of the winding shaft 26. I have. The outer peripheral surfaces of the pair of large-diameter portions 36 and 37 are formed so as to be recessed one step and have a width that supports the outside of the planned photographing screen in the width direction of the photo film 12, so that the planned photographing screen is not damaged. Absent.

The rear end 12a of the photographic film 12 has a narrow width so that it can be easily inserted into the slit 40, and a pair of locking holes 47 and 48 are formed therein. The rear end 12 a of the photographic film 12 is inserted into the slit 40 so that the locking pawls 43 and 44 are engaged with the locking holes 47 and 48, and locked on the reel 26. Then, the rear ends 12a of the photographic film 12 are restricted by the bent portions 41a, 42a of the holding ribs 41, 42 so as not to rise.
The locking claws 43, 44 are prevented from coming off from 8. A long hole 49 is formed in the rear end portion 12a between the locking holes 47 and 48. The long hole 49 is used when inserting the photo film 12 into the slit 40.

By the way, this photo film patrone 1
In the case of No. 0, since the flanges 27 and 28 with the lips 61 and 62 are used to prevent the loosening of the photographic film 12, the diameter from the center of the winding shaft 26 to the outermost periphery of the photographic film 12 wound around is reduced. (A in FIG. 3) needs to be constant. However, there are different types of photo films 12 having different lengths depending on the number of images that can be taken, and therefore, winding shafts 26 having different shaft diameters are used in accordance with these types.

That is, since the length of the photographic film 12 is short, the winding shaft 26 used for the photographic film 12 having a small number of specified photographic images is used with a large shaft diameter. Shaft 26 used for
Since the length of the photographic film 12 is long, a thinner shaft diameter is used. The dimensions of the shaft diameter of the winding shaft 26 are, as shown in FIG. 3, the thickness up to the lower shaft portion 39 and the large diameter portions 36, 37.
The thickness B is the length of the photo film 12 without changing the position of the slit 40 and the shaft diameter B is changed according to the type (length) of the photo film 12. And the support pieces 45,
46 may be provided at a position recessed by a predetermined dimension from the outer peripheral surfaces of the large diameter portions 36 and 37. Note that the center of the shaft diameter B coincides with the rotation center of the winding shaft 26. Further, in order to match the position where the rear end portion 12a of the photographic film 12 and the locking claws 43 and 44 are locked with the rotation center of the winding shaft 26, the slit 41 is shifted from the rotation center of the winding shaft 26. Is formed.

Next, an example of the shaft diameter of the winding shaft 26 according to the type of the photographic film 12 will be described below. Reel for 24-photographing photo film: shaft diameter B = 1
0.7mm 12-shaft take-up photo film reel ..... Shaft diameter B = 1
2mm

Here, the photographic film has a width of 24 mm and is wound around a length C shown in FIG. The total length D of the winding shaft 26 (see FIG. 3) is constant at 36.8 mm regardless of the type of the photographic film 12. Here, FIGS. 5 and 6 show the dimensions of the winding shaft 26 for a 12-photographing photographic film. According to this example, the support piece 4
5 and 46 are formed so that the outer peripheral surfaces 45a and 46a are located at positions recessed by about 0.2 mm from the large diameter portions 36 and 37.

Next, the operation of the above configuration will be briefly described. The operation of storing the photo film 12 in the cartridge body 11 is automatically performed by the automatic insertion device. At this time, the photo film 12 is a long strip-shaped photo film in which perforations are formed at predetermined intervals.

The automatic insertion device is provided with a flexible metal, circularly curved insertion member rotatably provided at the front end of the insertion member at the rear end 1 of the photographic film 12.
A claw that engages with the long hole 49 provided in 2a is formed.
Using this insertion member, the photographic film 12 is moved in and out through the film passage 21 of the pre-assembled patrone body 11, the rear end 12a of the photographic film 12 is inserted into the slit 40 of the winding shaft 26, and the locking holes 47 and 48 are locked. 443 and 44. At this time, of course, the lid opening / closing member in the apparatus is driven to rotate the lid member 22 to the open position.

Thereafter, the insertion member is attached to the patrone main body 11.
And the spool 13 is driven in the photo film winding direction, and wound around the winding shaft 26 while the photo film 12 is being wound.
Is stored inside the cartridge body 11.

When the photographic film 12 and the insertion member are inserted into the slit 40, the locking claws 43, 44 and the holding ribs 41, 42 prevent the entrance thereof, so that the photographic film is inserted by the insertion force of the insertion member. 12 and the insertion member may be deformed, but in the present embodiment, regardless of the type of the winding shaft 26 having a different shaft diameter, the holding ribs 41 and 42 are provided.
Is displaced by 1 mm or more with a load of 200 g, the pushing ribs 41 and 42 are pushed upward by the advancing input of the claws of the photo film 12 and the insertion member, and the insertion resistance to the photo film 12 and the insertion member is reduced. In addition, any of the winding shafts 26 is provided with a slit 40 at a fixed position with respect to the rotation shaft.
Is formed, the photographic film 12 can enter the depth of the slit 40 without being curved. Further, since the holding ribs 41 and 42 are also formed at fixed positions with respect to the slit 40, the locking holes 47 and 48 provided in the rear end portion 12a of the photographic film 12 have the locking claws 43 and 44.
When the pressing ribs 41, 42 are elastically returned to their original positions, the photographic film 12 is pressed against the lower shaft 39 by the pressing ribs 41, 42.
Any of the winding shafts 26 can be easily locked, and the locking force of the photographic film 12 can be made constant.

Thus, the rear end 12a of the photographic film 12
Is locked to the winding shaft 26, the insertion member rotates to the standby position, whereby the pawl is pulled out of the cartridge body 11. The locking claws 43 and 44 are shaped to prevent the photo film 12 from moving in the pulling-out direction, and the photo film 12 also remains flat without bending so that the vicinity of the locking holes 47 and 48 rises. Therefore, once the locking holes 47, 48 have been engaged with the locking claws 43, 44,
Only the claws of the insertion member are pulled out of the slit 40.

After the insertion member is returned to the standby position, the driving of the driving fork causes the spool 13 to rotate in the photographic film winding direction. As a result, the large diameter portion 3 of the winding shaft 26
Photo film 12 is provided on the outer periphery of
Is wound from the rear end side. During this time, since the photo film 12 is under tension,
It is wound up firmly. At this time, both ends or one end of the innermost circumference of the wound photo film 12 may fall off the large diameter portions 36 and 37 to cause a scratch or damage due to the bending of the photo film 12, but it will be recessed one step from now. Since the support pieces 45 and 46 are provided at the salient positions, the falling off can be reliably prevented.

Thereafter, when the photo film 12 is wound up to a length corresponding to the specified number of photographed images, the drive of the drive fork is stopped, and the cutter in the apparatus operates to operate the photo film 1.
Cut 2 With this cut, the tip shape of the photographic film 12 that is currently being wound is shaped,
The rear end portion 12a of the photographic film 12 on the rear side has a locking hole 4
7, 48 and a long hole 49 are perforated.

When the cutting of the photographic film 12 is completed, the driving fork is driven again, and the leading end of the photographic film 12 is wound into the cartridge 11. Then, when all the photo films 12 are wound into the cartridge body 11, the driving of the driving fork is stopped. Thereafter, the lid opening / closing member is driven to move the lid member 22 to the closed position.
As a result, the inside of the patrone main body 11 is completely shielded from light. Thereafter, the same operation is repeated.

In the case of the photographic film 12 having the largest number of specified photographic films among the types of the photographic film 12, since the diameters of the large diameter portions 36 and 37 of the winding shaft 26 for the photographic film 12 are small, the supporting pieces 45 and 46 are not required. The space to be formed cannot be obtained. In this case, the support ribs 45 and 46 for preventing the photo film 12 from falling off may be shared by the holding ribs 41 and 42.
For example, in the winding shaft 26 used for the photographic film 12 for taking a maximum of 40 shots, the shaft diameter B shown in FIG.
^'Since, for example, a 7 mm, pressing rib 41,
In order to maintain the function of the holding film 42, the holding ribs 41, 42 are formed at positions one step lower than the outer circumferences of the large diameter portions 36, 37. Therefore, the outer peripheral surfaces 41a, 42a of the holding ribs 41, 42 are photographic films. 12 is prevented from falling off.

In the embodiment shown in FIG. 8, the large diameter portions 36 and 37 on the upper shaft portion 38 side are omitted, and the innermost circumference of the photographic film 12 is supported by the support pieces 70 and 71. These support pieces 70, 71 are formed such that ranges 72, 73 of the outer peripheral surface, which cover the scheduled photographing screen of the photo film 12, are one-step recessed in order to prevent adverse effects on the photo film 12. The other outer peripheral surface supports both innermost peripheral ends of the photo film 12. In FIG. 8, the same reference numerals are given to members having the same functions as those described in FIG.

The components of the photographic film cartridge 10 described in each of the above embodiments, for example, the material of the resin components forming the patrone body 11 and the spool 13 are not limited in the present invention. Considering that, carbon black as a light shielding agent 0.05%
Resins containing from 3.0% to 3.00% by weight are desirable. Further, if necessary, such a resin as a lubricant such as silicone oil, an antistatic agent, an inorganic or organic pigment such as titanium oxide, a processing aid such as zinc stearate, an antioxidant, a nucleating agent, a plasticizer, and the like. You may make it contain.

As the resin, 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 , A polycarbonate resin, a polyvinyl chloride resin or a modified resin thereof is suitable. In particular, when considering dimensional accuracy, physical strength, ultrasonic welding suitability, etc., the melt flow rate is 1.0
Impact-resistant polystyrene resins containing 0.1 to 10% by weight of synthetic rubber of up to 10.0 g / 10 min, preferably 2.0 to 8.0 g / 10 min, particularly preferably 2.5 to 7 g / 10 min are preferred. Other desirable characteristics of this resin include a flexural modulus of 15,000-30,000 kg / cm ² , preferably 1,8000-2, 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 light-shielding properties. Examples of the classification according to the carbon black production method include furnace method carbon black, channel method carbon black, thermal method carbon black, and the like, but photographic adverse effects (fog generation, decrease in sensitivity or increase in sensitivity).
Less, or in terms of light shielding, the average particle size is 10 to 80
Furnace carbon black having a mμ of PH5 to 9 is preferable, and furnace carbon black having a pH of 15 to 50 mμ and PH6 to 8 is particularly preferable.

As commercial products, 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, # 950, # 2200 (B), # 2400
(B), MA8, MA11, MA100 and the like. Overseas products include, for example, Cabot Black Pearls 2, 46, 70, 71, 7
4,80,81,607 etc., Regal 300,330,400,660,991, SRF-S
Sterling 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-301
6, XC-3017, 3020, etc., but not limited thereto.

The particle size of the furnace carbon black is 10
If it is less than mμ, the kneadability with the resin is poor, and the light-shielding property and the physical strength are deteriorated. Conversely, if it exceeds 100 mμ, the dispersion is good but the light-shielding ability is inferior. If the carbon concentration is increased to secure the light-shielding property, the physical strength is reduced and the moldability is deteriorated, so that it is not practical. In addition, many carbon blacks having a pH exceeding the range of 5 to 9 tended to cause photographic adverse effects and could not be used.

The amount of furnace carbon black added is
The content is preferably 0.05% by weight to 3.00% by weight from the viewpoints of securing light-shielding properties, injection moldability, and securing the physical strength of the patrone main body. If the addition amount of carbon black 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 decreases, and the water absorption rate increases. Stripes and the like are generated, resulting in poor appearance and deterioration of surface strength.

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

As a method of imparting lubricity to the molded parts constituting the patrone body 11 and the spool 13, there are a method of adding a lubricant to a resin for molding them and a method of applying a lubricant to a molded article. . 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, fatty acid esters of polyhydric alcohol esters, and the like. It is not limited.

The silicone oil added to the molded parts constituting the patrone body 11 and the spool 13 includes:
JP-A-62-286043 or JP-A-62-286043
Dimethylpolysiloxane and carboxyl-modified silicone oil described in JP-A-284355 are preferred. The amount of silicone oil added is between 0.05% and 5.0% by weight, preferably between 1.0% and 3.0% by weight.

If the amount is less than 0.05% by weight, the desired lubricating effect cannot be obtained. If the amount exceeds 5.0% by weight, the resin slips in the screw of the injection molding machine, and not only does the molding cycle become longer, The amount of silicone oozing out on the surface of the molded article increases, and the oozing oil is transferred to the photographic film 12 in the patrone main body 11, thereby preventing diffusion of the developing solution into the photographic film 12 during photographic film development. Action occurs. Further, in the ultrasonic seal, the adhesion between the upper and lower cases 14 and 15 is reduced.

Silicone oil has a viscosity of 1000 at 25 ° C.
Preferably it is ~ 60000CS. 1000 at 25 ° C
Below CS, bleed out is severe and adversely affects photographic performance. If it exceeds 60000CS, the kneadability with the resin is poor and it cannot be used. In addition, various modified silicone oils such as a fluorine-modified silicone oil are commercially available other than the above, but most of them have a bad influence on the photographic properties of the photographic film. is there. Photo film cartridge 1 due to insufficient lubricity or severe thermal decomposition during injection molding
It could not be used for 0.

[0054]

As described above, according to the present invention, the locking shaft formed in the rear end portion of the photo film is engaged with the locking claw of the slit to lock the photo film. By rotating the photo film around the support piece by rotating it in the photo film take-up direction, you can easily change the height of the support piece while maintaining the displacement amount and locking force of the holding ribs. A winding shaft according to the type of the film can be formed.

Further, according to the invention in which the outer peripheral surface of the leading end of the support piece is depressed by one step, it is possible to reliably prevent the photographic performance from being deteriorated due to a scratch or the like occurring in the intended photographing screen in the width direction of the photographic film. .

[Brief description of the drawings]

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

FIG. 2 is a perspective view of a spool.

FIG. 3 is a sectional view of a spool.

FIG. 4 is a perspective view of a winding shaft.

FIG. 5 is a plan view of a winding shaft.

FIG. 6 is a cross-sectional view of the winding shaft cut along the AA cross section shown in FIG. 5;

FIG. 7 is a cross-sectional view of a spool using the longest photographic film reel.

FIG. 8 is a cross-sectional view showing a spool according to the embodiment in which the outermost periphery of the support piece supports the innermost periphery of the photographic film.

[Explanation of symbols]

 Reference Signs List 10 Photo film cartridge 13 Spool 26 Winding shaft 27, 28 Flange 33, 34 Receiving flange for flange attachment 36, 37 Large diameter portion 40 Slit 41, 42 Holding rib 45, 46, 70, 71 Supporting piece

Claims (3)

(57) [Claims] 1. A slit formed in a winding shaft, a locking claw provided in the slit, for locking a photographic film, and a photographic film protruding into the slit to separate the photographic film from the locking claw. A pair of elastic holding ribs for preventing falling off, and projecting from the base side of these holding ribs so as to face each other along the axial direction of the winding shaft from a height position protruding in the radial direction of the winding shaft. A support piece for supporting the innermost peripheral ends of the photographic film to be wound, and engaging a locking hole formed in the rear end of the photographic film with the locking claw to engage the photographic film. A spool for a photographic film, wherein, after stopping, the winding shaft is rotated in the photographic film winding direction to wind the photographic film around the outer periphery of the support piece. 2. The supporting piece is formed such that the outer peripheral surface at the tip end in the protruding direction is recessed one step, so that the innermost peripheral ends of the photographic film wound around these concave surfaces are prevented from falling off. The spool for a photographic film according to claim 1, wherein: 3. The holding rib has a capacity of 1 g at a load of 200 g.
The photographic film spool according to claim 1, wherein the spool is displaced by at least mm.