JPH04116549A - Automatic feeding and loading type photographic film cartridge - Google Patents

Abstract

PURPOSE:To improve the reliability of an automatic feeding and loading function in a film cartridge by providing a means which adjusts the curl of a photographic film under the state of 23 deg.C and 20%RH to be +20 from -20, houses the film inside the cartridge casing by rolling the whole length of regular size in a roll state and automatically feeds it by engaging with a camera mechanism inside. CONSTITUTION:The curl of the photographic film under the state of 23 deg.C and 20%RH is adjusted to be +20 from -20. Besides, the whole length of the regular size of the photographic film is rolled and housed inside the cartridge casing. Then, it is loaded in the camera. When a case barrel 1 is turned right, the hooks 122 and 222 of canopy pieces 21 and 22 are disengaged and hooks 123 and 223 are engaged. Then, the barrel 1 and an insertion barrel 2 are locked and a tunnel slit 5 is formed. Next, when a scroll is turned left, the photographic film is easily and surely fed to the outside of the cartridge while being slid on the inside surface of the insertion barrel by the releasing power of its own or the help of a handling pawl 23. Thus, the reliability of the automatic loading when the film is loaded in the camera is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a photographic film cartridge, and more particularly to a photographic film cartridge that does not have a film tongue end pulled out of the cartridge and that can be easily loaded into a camera. This invention relates to a highly reliable photographic film cartridge with automatic feeding and loading.

[Conventional technology]

BACKGROUND ART A roll film known as JIS 135 cartridge has been widely used as a film for general photography. When taking pictures, the user has to perform a cumbersome operation of winding the tongue end of the film, which has been pulled out from the cartridge shell, around the camera's take-up spool.

Furthermore, even with automatic loading cameras that have become popular in recent years, many require the user to pull out the film tongue end to a predetermined position and set it. A camera was required.

U.S. Pat. No. 4.841.319, U.S. Pat. No. 4.834.306, U.S. Pat. is disclosed. This technology is characterized in that a roll of regular length film is all housed in a film cartridge, and after loading into a camera, the film is fed out of the cartridge by a means for connecting the film cartridge and camera.

This simplifies film mounting. However, in the improved technique, there is a problem in that when the spool is rotated by the drive system of the camera and the leading end of the film is fed out from the film cassette, film feeding failure occurs.

Furthermore, the leading end of the film that has been fed out needs to cross the exposure hole of the camera and be delivered to the take-up spool chamber. Trouble such as crashing occurred, and improvements were needed.

Furthermore, although the format of the film cartridge is different, JP-A-2-151844 proposes improvements from the camera side to address the above-mentioned similar problems, or it leads to an increase in the cost of the camera, requiring improved technology from the film side. .

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a film cartridge that is smoothly fed out of a cart 1 and mounted at a shooting position when a roll film wound and stored in a full length roll of a fixed length is loaded into a camera. It is in. More specifically, the objective is to improve the reliability of the automatic feeding and loading functions of the film cartridge.

[Structure of the invention]

The object of the present invention is to reduce the curl at 23° C. and 20% RH of a photographic film having a photographic constituent layer including a light-sensitive silver halide emulsion layer on one side of a support from -20 to +2.
0, the entire fixed length of the photographic film is wound into a roll and stored inside the cartridge shell, and an automatic feed-out type photographic film cartridge is provided in which a means for engaging with a camera mechanism and feeding out the film is provided. achieved.

In other words, as a result of studies conducted in accordance with the purpose of the present invention, it has been found that failure to feed the leading edge of the film from a film scroll in which the full length of the film is completely wound into the cartridge shell and operational hindrances at the camera exposure hole are due to roll failure. We identified the occurrence of large curls in the film, and fixed the temperature at 23°C and 20% RH to prevent poor feeding and operational problems at the entrance of the exposure chamber.
I learned that it is necessary for the curl of the roll film to be within the range of -20 to +20. More preferably, it is -10 to +lO1, and still more preferably -5 to +5.

The curl referred to in the present invention indicates the degree of curvature of the curved surface that appears when the film is placed in a free state,
This is the numerical value of curvature 1/R when the radius of curvature R of the curve given by the intersection line of the plane perpendicular to the longitudinal direction of the roll film and the curved surface of the film is expressed in meters.

A specific method for measuring curl is to cut a roll film having a predetermined width of ammm into strips in the width direction to prepare a measurement sample in the form of a 1 mm Xa- strip.

The sample is brought to equilibrium at 23°C and 20% RH, and the curvature 1/R is determined.

In this case, a curl with a concave surface on the photosensitive emulsion layer side is added (
+), and convex curls are considered negative (-).

For actual curl measurement, a group of curve rulers is prepared corresponding to each curvature, a curled sample is placed on the curve, and the curvature of the curve that most closely approximates the curve is determined as the curl of the sample.

In the present invention, in order to adjust the degree of curl of the roll film, it is necessary to balance the intralayer stress between the photographic constituent layers including photosensitive emulsion layers and the back layer provided on both sides of the support, and from an effective point of view, to adjust the degree of curl of the roll film. The first method is to control the amount of gelatin.

In the case of a color film, the amount of gelatin on the back layer side is 0 compared to the amount of gelatin on the photographic constituent layer side of 1.0, although it varies depending on the silver halide content, amount of latex having elasticity, degree of hardness, film thickness, etc. It is preferable to set it as .2-1.5.

It is also possible to adopt a method in which the curl of the support itself is adjusted in advance.

Triacetylcellulose (TAC) base and polyethylene terephthalate (PET) base are used as the support, but by treating the surface of these resin bases with an organic solvent that can penetrate the resin, the support itself can be improved. The curl is pre-adjusted.

Acetone solvents are used for surface treatment of TAC bases, and phenol solvents are used for PET bases, and the degree of curling varies depending on the amount of solvent applied to the support surface.

Furthermore, in practice, it is convenient to appropriately combine the method using the amount of gelatin and the method using solvent surface treatment.

The structure of the cartridge shell used in the present invention is such that there is no pulled-out film tongue end, and the entire length of the fixed length is rolled into the cartridge shell, and the film is engaged with a camera mechanism inside the cartridge shell. Any film cartridge embodiment already disclosed may be used as long as it has a feeding means.

The structure of the film cartridge preferably used in the present invention is that the cartridge shell of the photographic film cartridge has a double structure consisting of a sheath tube that slides and fits together, and a fitting tube that is inserted into the sheath tube. The cylinder has a bottom plate provided with a shaft support hole for the spool only at one end of the cylinder, and the peripheral surface of each cylinder is provided with a slit parallel to the cylinder axis and an eaves piece in contact with one edge of the slit, An automatic system that fits the sheath tube and the insertion tube, brings one side of the eaves close together to make it light-tight, rotates both tubes relative to each other, and separates one side of the eave to form a tunnel slit for feeding and feeding photographic film. Examples include feed-out type photographic film cartridges.

An example of such a cartridge shell is shown in cross-section in FIG.

Fig. 1(a) shows a state in which one side of the two eaves are brought into close contact to create a light-tight state, and Fig. 1(b) shows a state in which both tubes are rotated relative to each other to separate the eaves pieces to form a tunnel slit. .

In the figure, l is a sheath tube, 2 is a fitting tube, and 3 is a bottom plate with a spool shaft support hole 4. One plate is provided for each tube, and when both tubes are fitted, they are assembled facing each other. Located at both ends of the cartridge shell. The bottom plate may have the same size as the cylinder diameter,
It ejects from the periphery of the cylinder and can be processed into a convenient shape for camera loading or cartridge operation, such as rectangular, trapezoidal, polygonal, circular shapes, notches, protrusions, and groove rings. 11
and 21 are the slits of the sheath tube and insertion tube, 12 and 22, respectively.
are the eaves pieces of the sheath tube and the insertion tube, respectively, and the eaves piece 22 is inserted in the slit 11 in a manner that it is pushed into the slit 11.

Reference numeral 122 is a light shielding piece against light entering from the tangential direction of the cylinder on the eaves piece contact surface, and a hook that engages with the tip 222 of the eaves piece 22 to prevent the eaves piece from opening. Also 123, 223
are hooks that fit into each other when the eaves pieces are opened, and keep the tunnel slit formed by both eaves pieces stable.

When the sheath tube 1 is turned relatively to the right from the state shown in FIG. 1(a), the sliding rail 121 hidden in the eaves piece 22 appears.

Several slide rails 121 are provided inside the eaves piece 21,
Correspondingly, a rail groove 221 is provided on the inside of the eaves piece 22, which is shown by a phantom line in the figure.

The sliding rail 121 and the rail groove reduce the contact surface between the inner surface of the formed tunnel slit 5 and the photographic film, and the outermost sliding rail 121 also serves as a light shielding plate against light from the side. In addition, the sliding rail 121 forms a smooth plane with the upper inner surface of the slit 21 in the figure,
Eliminates problems such as getting caught in film feeding.

Reference numeral 23 denotes a gripping claw that guides the leading edge of the film, which is slid on the inner surface of the insertion tube and is fed out, to a tunnel slit formed therein.

Load the photographic film cartridge in the state shown in FIG. 1(a) into the camera, with a scroll built into the cartridge shell described above, and turn the sheath to the right to release the hooks 122 and 2 of the eaves piece.
22 is removed, the hooks 123 and 223 are fitted, and the sheath cylinder,
The fitting tube is locked and the tunnel slit 5 is formed.

Next, when the scroll is turned to the left, the photographic film slides on the inner surface of the insertion tube by its own unraveling force and is easily and reliably fed out of the cartridge with the help of the handling claws 23.

When photographing is completed, the camera is taken out of the camera in the state shown in FIG. 1(a) by performing the reverse operation to that described above.

The silver halide emulsion used in the photographic film of the present invention is based on Research Disclosure (hereinafter abbreviated as RD).
308119 can be used. The table below shows the locations.

Item C) [Page coiodo structure of RD308119 Item 993I-A Manufacturing method
〃 〃 and Section 994E Epitaxial 〃 〃1 Internally applied sensitive material Negative 9951. -H term positive (including internal fog particles) Emulsion mixed and used 〃 I-J term desalination ・
Section I[-A In the present invention, the silver halide emulsion used is one that has been subjected to physical ripening, chemical ripening, and spectral sensitization. Additives used in such processes are DR17643, DR18
716 and DR308119.

The table below shows the locations.

[Item] [Page of RD308119 [RD
17643 [R[1I8716 chemical sensitizers 99
61[-A section 23 648 Halogen conversion〃 Substituted metal-containing monodisperse solvent addition 1-C section 1-D section 1-F section Supersensitizer 9961V-A-11! , Section J
23-24648-9 Antifouling agent 998 VI
24-25649 Stabilizer 998
VI 24-25649 Known photographic additives that can be used in the present invention are also described in the above DR.

The relevant entries are shown in the table below.

Item c) [Page of RD308119 [H17
643 [RI) 18716 Color clouding prevention agent Pigment image stabilizer Whitening agent Ultraviolet absorber 1002 ■-■ section fool ■-J section 98 v 1003 ■-C1 xmc section light absorber light scattering agent filter dye binder static Inhibitor Hardener Plasticizer Lubricant ■ ■ ■ ■ X■ X■ X■ Matting agent 1007 ing.

The relevant entries are shown in the table below.

[Item] [Page of RD308119 [RD17
643] [RD18716] Yellow coupler 10
01 ■-ri term ■C-G term ma C term ta coupler 1
001 ■-D term ■C-G term siadician coupler 001 ■-D term ■C-G term C-term do coupler 1002 ■-G term ■G term DIR coupler
1001 ■-F term ■F term BAR coupler
1002 ■-F term alkali soluble coupler 100
1 ■-E Section The additive used in this invention is RD308.
It can be added by the dispersion method described in 119XIV.

In the present invention, the aforementioned RD1764328 page, RD
18716647-8 and RD308119(7)X
IX 1. : The supports described can be used.

The photosensitive material of the present invention can be provided with auxiliary layers such as a filter layer and an intermediate layer described in the above-mentioned RD308119--.

The photosensitive material of the present invention can have various layer/structures such as normal layer, reverse layer, and unit structure as described in the section RD308119--.

The present invention covers color negative films for general use or movies, color reversal films for slides or televisions,
It can be applied to various color photosensitive materials such as color positive films.

The photosensitive material of the present invention includes the aforementioned RD1764328-29,
RD18716647 page and RD308119 No.XI
X j,: The above can be developed by a conventional method.

〔Example〕

Next, Examples A and B will be given to specifically illustrate the present invention.

Example Group A Photographic Film Samples 1 to 8 75 μm thick polyethylene terephthalate (PET) subjected to corona discharge treatment at 0.02 KVA min/d (PET) Lamination of the first layer and the second layer on both sides of the support. Undercoating is performed, and a laminated back layer is provided on one side thereof as a back layer, in which a first back layer containing conductive fine particles is coated, and a second back layer is applied thereon.

Furthermore, a photographic structure consisting of multiple laminations was provided on the other side of the support to provide Samples 1 to 5.

In this group of Examples, the amount of gelatin applied to the back layer was varied as shown in Table 1 to adjust the curl of the photographic film.

Undercoat layer First undercoat layer (formulation); (wet film thickness); 20 μm (dry); 100°C, 1 minute Second undercoat layer (formulation); (wet film thickness); 20 μm (dry); 100 °C for 1 minute Back layer First back layer First, a conductive fine particle dispersion liquid used in the first back layer coating solution formulation was prepared.

: Conductive fine particle dispersion (tin oxide-antimony oxide composite dispersion): 230 parts by weight of stannic chloride hydrate and 23 parts by weight of antimony trichloride
3000 parts by weight of ethanol! ! Uniformly dissolved in the volume of
An aqueous solution of IN sodium hydroxide was added dropwise to this solution until the pH of the solution became 3 to obtain a coprecipitate of colloidal stannic oxide and antimony oxide. This at 50'C for 24
A reddish-brown colloidal precipitate obtained after standing for a period of time was separated by centrifugation. Excess ions were removed by adding water to the precipitate and washing with water by centrifugation three times.

200 parts by weight of the colloidal precipitate from which excess ions have been removed are redispersed in 1500 parts by weight of water and sprayed into a calcining furnace heated to 600°C to form tin oxide with a bluish color and an average particle size of 0.2 μm.
A fine powder of antimony oxide composite was obtained. The specific resistance of this fine powder was 25Ω·mm.

A mixed solution of 40 parts by weight of the above fine particle powder and 60 parts by weight of water is
After adjusting to H7.0 and coarsely dispersing with a stirrer, use a horizontal sand mill (product name: Dyno Mill, WILLYA, BACHOF).
(manufactured by ENAG) until the residence time reached 30 minutes.

(Formulation); (Wet film thickness); Adjusted thickness (see Table 1) (Dry)
; 130°C, 230 seconds 2nd back layer (formulation); (Wet film thickness): Adjusted thickness (see Table-1) (dry);
130°C, 30 seconds Photographic constituent layers In all samples below, the amounts added in the constituent layers of silver halide photographic light-sensitive materials are expressed in grams per 1 m'' unless otherwise specified. teeth,
Shown in terms of silver. The sensitizing dye is expressed in moles per mole of silver.

On the PET film support having the back layer, each layer having the composition shown below is sequentially formed from the support side,
Multilayer color photographic film samples 1-8 were prepared.

1st layer; antihalation layer (C-1) black colloidal silver 0.18 UV absorber (UV-1>
0.23 High dregs point solvent (Oll-1)
0.18 gelatin
1.42 Second layer: Intermediate layer (IL-1) Gelatin 1.27 Third layer - low sensitivity red-sensitive emulsion layer (RL) Silver iodobromide emulsion (Bm-1) 0.20 Silver iodobromide emulsion ( Em-2) 0.78 sensitizing dye (S[1-1) 1.8 X 10 sensitizing dye (SD-2) 2.8 X I O-'
Sensitizing dye (SD-3) 1.9 X 10-
'Sensitizing dye (SD-4) 1. I
O-'Cyan coupler (C-1) 0
．． 70 colored cyan coupler (CC-1) 0.
066DIR compound (D-1) 0.0
28 High boiling point solvent (Oll-1) 0.64
Gelatin 1.18 4th layer: Medium red-sensitive emulsion layer (RM) Silver iodobromide emulsion (Em-3) 0.78 Sensitizing dye (SD-1) 2.1 x 10-'
Sensitizing dye (SD-2) 1.9 X 10-
'Sensitizing dye (SD-3) 9.6 x 10
"Sensitizing dye (SD-4) 9.6 x 1
0-' Cyan coupler (C-1) 0.
28 colored cyan coupler (CC-1) 0.0
27DIR compound CD-1) 0.01
1 High boiling point solvent (Off -1) 0.26
Gelatin 0.58 5th layer; High sensitivity red-sensitive emulsion layer (RH) Silver iodobromide emulsion (Em-4) 1.73"-sensitizing dye (SD-1) 1.9 X 10
"'Sensitizing dye (SD-2)], 7 X
10-' Sensitizing dye (SD-3) 1.7
X 10-'Cyan coupler CC-2)
0.14DIR compound (D-1) 0
．． 025 High boiling point solvent (Oij! -1)
0.17 Gelatin 1.24 6th layer: Intermediate layer (IL-2) Gelatin O, SO 7th layer;
Low-sensitivity green-sensitive emulsion layer (GL) Silver iodobromide emulsion (Em-1) 0.11 Silver iodobromide emulsion (Em-2) 0.98 Sensitizing dye (SD-4) Sensitizing dye (SD-5 ) Magenta coupler (M-1) Magenta coupler (M-2) Colored magenta coupler (CM-1) DIR compound C
D-2) High boiling point solvent (Oif-2) Gelatin 8th layer; medium-sensitivity green-sensitive emulsion layer (GM) Silver iodobromide emulsion (Em-3) Sensitizing dye (SD-4) Sensitizing dye (SD- 6) Sensitizing dye (SD-7) Sensitizing dye (SD-8) Magenta coupler (M-1) Magenta coupler (M-2) Colored magenta coupler (CM-1) DIR compound (
D-2) High point solvent (Oi 1-2) Gelatin 6,8 X 1 0-' 6,8 X IO-' 0.54 0.19 0.06 0.017 0.81 1.77 0 .66 8.2xlO-'1.9XlO-'],2;High sensitivity green-sensitive emulsion layer CGH) Silver iodobromide emulsion (E(11-5) Sensitizing dye (SD~4) 2.1'X sensitizing sensitization (SD-6) 1.2x sensitizing dye (SD,
-7) 1. Ox sensitizing dye (SD-8)
3.4 X magenta coupler (M-1) Magenta coupler (M-3) Colored magenta coupler (CM-1) High boiling point solvent (O
iI! -2) Gelatin 10th layer; Yellow filter layer (YC) Yellow colloid silver stain inhibitor (SC-1) High boiling point solvent (Oil -2) Gelatin formalin scavenger (88-1) Formalin scavenger (H3-2) ) 11th layer; low sensitivity blue-sensitive emulsion layer (BL) silver iodobromide emulsion I
n-1) 1.66 10-' 10-@ 0.094 0.044 0.038 0.31 1.23 0, 0 5 0, 1 0.125 1.33 0.088 0.066 0.12 Silver iodobromide emulsion (E!1l-2) Silver iodobromide emulsion (Bm-3) Sensitizing dye (SD-9) Sensitizing dye (SD-10) Yellow coupler (Y-1) Yellow coupler (Y- 2) High boiling point solvent (Oif-2) Gelatin formalin scavenger (H8-1) 12th layer: High sensitivity blue-sensitive emulsion layer (BH) Silver iodobromide emulsion (
Em-3) Silver iodobromide emulsion (Em-6) Sensitizing dye (SD-9) Sensitizing dye (SD-10) Yellow coupler (Y-1) High boiling point solvent (Oll-2) Gelatin formalin scavenger ( O3-1) Formalin scavenger (H5-2) $13 layer; 1st protective layer (Pro-1) 0.24 0.12 5, 2 X 1 0-' 1, 9 X l O-' 0. 65 0.24 0.18 1.25 0.08 0.14 0.81 1, 8 X 1 0-' 7, 9 X 1 0-' 0.18 0.0?4 1.30 0.05 0 .12 Fine grain silver iodobromide emulsion 0.4 (average grain size 0
．． 08 μm Ag1 1 mol%) Ultraviolet absorber (UV-
1) 0.065 ultraviolet absorber (UV-
2) O,,10 high boiling point solvent (Oij!
-1) 0.07 high boiling point solvent (Oif
-3) 0.07 formalin scavenger (H8-1) 0.13 formalin scavenger (H3-2) 0.37 gelatin
1.31 14th layer; 2nd protective layer (Pro-2) Alkali-soluble matting agent (average particle size 2 μm) 0.13 Polymethyl methacrylate (average particle size 3 μm added) 0.02 Slip agent (WAX
-1) 0.04 gelatin
0155 In addition to the above composition, coating aid 5u-Is dispersion aid 5u-2, viscosity modifier, hardening agent H-
1, H-2, stabilizer 5T-1, antifoggant AP-1.
Mw+10,000 and Mw:1.10 with different degrees of polymerization
0.000 of two types of AP-2 were added.

The emulsion and additives used in the above sample are as follows.

The average grain size of the emulsion grains is expressed as the long side grain diameter converted into a cube. Each emulsion was optimally gold-sulfur sensitized.

C-2 M C-1 M-1 0I( C/ 0if -1 M M υN (SD-3) (SD-4) C4tl@(L) V-2 AX-1 u-1 S-1 (SD-5) (SD-6) (SD-7) (SD-8) tHs CH.

CH.

CH.

Weight average molecular weight Mw=3,000 u-2 S-2 (SD-9) (SD-10) F-2 T-1 H n: Degree of polymerization Example Group B Photographic film samples 9 to 15 Thickness: 125 μm A laminated back layer consisting of a conductive first back layer containing acetone and cellulose diacetate and a second back layer provided thereon is directly on one side of a triacetyl cellulose (TAC) support, and only on the other side. Subbing liquids A or B having different amounts of acetone were applied to prepare supports A or B having different curls, and the photographic constituent layer used in Example Group A was provided thereon.

In order to adjust the degree of curl, the amounts of gelatin in the 1st to 14th layers were adjusted in proportion to each layer as shown in Table 1.

Back layer 1st back layer (conductive) (Prescription); (Amount of tube fabric); 55!1f/1 (drying); 80°C, 5 minutes Undercoat layer Undercoat mA... (Support A; Curl -15) (Formulation); (Water weight), 50nf/1 (dry); 80'C, 5 minutes 2nd back layer (formulation); (Wet film thickness); 20μm (dry); 80°C, 5 Subbing layer B... (Support B; Curl-5) (Formulation): (Wet film thickness); 20 μm (Dry); 80°C, 5 minutes Photographic constituent layer Same structure as Example Group A, Multilayer color photographic film samples 9-15 were made.

However, the amount of gelatin in the photographic constituent layers was adjusted proportionally, and the ratio of gelatin amounts was adjusted as shown in Table 1.

These photographic film samples 1-15 are 135 size 36
A film cartridge was prepared by cutting the film to a length sufficient for photographing a frame, making it into a roll, and storing it in the photographic film cartridge shown in FIG. 1 so that the leading edge of the film did not protrude outside the cartridge. Impact-resistant polystyrene was used as the resin material for the film cartridge.

Next, we loaded it into the camera and tested the reliability of automatic film loading (the incidence of running errors when the film is first fed from the film cartridge to the take-up spool). The results are shown in Table-1.

Qsu*...Sample table-1 outside the present invention As can be seen from the results in Table-1, the curl value of the film was -2
It has been found that the film cartridge of the present invention adjusted to 0 to +20 dramatically increases the reliability of automatic loading when loaded into a camera.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an example of a film cartridge shell according to the present invention, in which (a) shows a light-tight state, and (b) shows a light-tight state.
shows the state in which the tunnel slit is formed after being loaded into the camera. L... Sheath tube, 2... Fitting tube, 3... Bottom plate, 4... Spool shaft support hole, 5... Tunnel slit, 11 and 21... Slit, 12 and 22...・Eave piece, 23...handling claw.

Claims (2)

[Claims] (1) Photographic film with a photographic constituent layer including a light-sensitive silver halide emulsion layer on one side of the support at 23°C, 20%
An automatic camera that adjusts the curl at RH from -20 to +20, winds up the entire length of the photographic film into a roll and stores it inside the cartridge shell, and is provided with means for engaging with a camera mechanism and feeding out the film inside the cartridge shell. Retractable photographic film cartridge. (2) The cartridge shell of the photographic film cartridge has a double structure consisting of a sheath tube that slides and fits into each other and a fitting tube that is inserted into this, and only one end of each tube has a shaft support hole for the spool. Each cylinder has a bottom plate provided with a slit parallel to the cylinder axis and an eaves piece in contact with one edge of the slit on the peripheral surface of each cylinder, and the sheath cylinder and the insertion cylinder are fitted to form an eaves. 2. The automatic feeder according to claim 1, wherein one side of the film is brought into close contact with the other side to provide light density, and the two cylinders are relatively rotated to separate one side of the eaves to form a tunnel slit for feeding and feeding the photographic film. Mountable photographic film cartridge.