JPH05158192A - Cartridge for photographic film - Google Patents

Abstract

PURPOSE:To surely prevent a photographic film from being doubly exposed. CONSTITUTION:The photographic film 4b is fed to the outside of cartridge main bodies 3a and 3b from a film exit and entrance port 13 through a film passage 14 by rotating a spool. On the inside of the passage 14, a projecting pin 22 which is freely moved between a projecting position where it obstructs the passing of the film 4b and a retreat position where it is retreated in a hole 19 from the projecting position is provided. The pin 22 is moved to the position where it is slightly retreated from the projecting position by being pressed by the film 4b when a cartridge for a photographic film is not used and moved to the projecting position when the cartridge for a photographic film is already used. Then, the film 4b is prevented from being fed to the outside of the cartridge main bodies 3a and 3b from the port 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic film cartridge in which a photographic film is stored in a roll.

[0002]

2. Description of the Related Art In a conventional photographic film cartridge containing unexposed 135 film, the leader portion of the photographic film is exposed from the main body of the cartridge through the film entrance / exit. Then, when the film is loaded into the camera, the cartridge main body is put into the cartridge loading chamber while taking care so that the leader portion of the film is correctly set at a predetermined position of the film passage of the camera.

On the other hand, as described in US Pat. No. 4,834,306 or Japanese Patent Application Laid-Open No. 3-37645 by the present applicant, in the unused state, the tip of the photographic film is wound into the cartridge main body, A photographic film cartridge is known in which the loading operation can be easily performed without paying attention to the leader portion when the film is loaded. This photo film patrone is loaded into the patrone loading chamber of the camera, and then the spool provided on the patrone main body is rotated by the drive shaft on the camera side so that the leading end of the photo film is sent out from the discharge port formed on the patrone main body. ..

[0004]

However, in the case of the former photographic film cartridge, since the leader portion is caught in the cartridge after use, it can be distinguished whether it is unused or used. In rare cases, the leader part may not be wound into the cartridge after use, but since the leader part has a crease when it is wound around the film take-up shaft, it is possible to determine from the presence or absence of this crease. In the case of a patrone, the user cannot be identified because the reader unit is not pulled out even if it is unused or used. Therefore, when the used cartridge is loaded into the camera and photographed, double exposure is performed on the photographic film, and even if it is developed, a clear print photograph cannot be obtained.

The present invention has been made in view of such a background, and an object thereof is to provide a photographic film cartridge which surely prevents double exposure of the photographic film.

[0006]

In order to achieve the above object, a photographic film patrone having a structure in which a spool is rotated so that the photographic film is sent out of the film cartridge main body through a film passage through a film entrance / exit. A movable projecting member is provided at a projecting position that prevents passage of the photographic film in the passage, and this projecting member abuts the photographic film in the film passage in an unused state to prevent movement to the projecting position. After the use, the leading edge of the photographic film moves to the projecting position when the leading edge of the photographic film is caught in the main body of the cartridge by passing through the film passage, and the feeding of the photographic film from the entrance of the film to the outside of the main body of the film is prohibited.

[0007]

EXAMPLE The photographic film cartridge of Example 1 will be described in detail below. As shown in FIG. 2, the photographic film cartridge 2 comprises a cartridge main body 3 including an upper case 3a and a lower case 3b, and a spool 5 around which the photographic film 4 is wound with its rear end 4a locked.

Inside the cartridge main body 3, there is provided a roll storage chamber 10 for storing the roll portion of the photo film 4. The inner wall of the roll storage chamber 10 including the upper case 3a and the lower case 3b is provided with a photograph. Ring-shaped ribs 11 and 1 that come into contact with the outermost periphery of the film 4 and prevent the film from being loosened.
Two are provided. Further, a film passage 14 is provided between the roll storage chamber 10 and the film entrance / exit 13, and when the spool 5 rotates in the film feeding direction, the tip 4b of the photographic film 4 is separated by the separating claw 15 provided on the inner wall of the lower case 3b. Are separated from the roll storage chamber 10 toward the film passage 14. The film passage 14 is provided with a light-shielding teremp 16 on its inner wall to keep the inside of the cartridge main body 3 in a light-tight state.

As shown in FIG. 1, a through hole 17 exposed to the outside of the cartridge body 3 is provided on the inner wall of the upper case 3a forming the film passage 14. Through hole 1
The film 7 is formed between the film 16 provided in the film passage 14 and the film entrance / exit 13 and outside the exposure screen range in the film width direction. A hole 19 is provided right below the through hole 17 in the inner wall of the lower case 3b forming the film passage 14. In the hole 19, a spring 20
Is fitted. This spring 20 is used for the film passage 1
The projecting pin 22 provided so as to traverse 4 is urged upward.

As shown in FIG. 1, the photographic film cartridge 2 is assembled by the manufacturer in an unused state in which the leading end 4b of the photographic film 4 is located in the urging direction of the projecting pin 22, and the spool 5 is rotated in the film feeding direction after shipment. When this is done, the photographic film 4 can be sent out.

On the head of the protruding pin 22, a used indicator 22b is shown.
When the tip 4b of the photographic film 4 crosses the film passage 14 and is caught in the cartridge body 3 after use, it moves to the projecting position shown in FIG.
The used display 22b can be confirmed through. The used indicator 22b may be painted in a color different from that of the cartridge main body 3, or a member having a different color from that of the cartridge main body 3 may be fitted into the head of the protruding pin 22.

Further, the protruding pin 22 is provided with a groove 22a, which is pushed into the hole 19 when pressed by the jig 24 inserted from the through hole 17 as shown in FIG. The protrusion 19a provided on the edge engages with the groove 22a and is held at the retracted position. When the projecting pin 22 is moved to the retracted position, the projecting pin 22 moves to the film passage 14
Since it is retracted into the hole 19 from the photo film 4
Is ready to be sent.

The operation of the above configuration will be described. An unused photo film cartridge 2 is loaded into the camera and a picture is taken. In the camera, the unexposed film 4 is exposed each time an image is taken, and when all the frames are exposed, the drive shaft rotates the spool 5 in the rewinding direction. As a result, the exposed film 4 is rewound into the cartridge main body 3.

During the film winding and film rewinding after each shooting, the projecting pin 22 always slides on the photographic film 4, but there is little friction between them, so there is no problem in feeding the film. Also, since the sliding position is outside the exposure screen range, even if scratches occur, it does not affect the photographic image. The rewinding of the photographic film 4 is completed when the leading end 4b of the photographic film 4 passes through the film passage 14 and is completely wound into the cartridge body 3. When the leading end 4b of the photographic film 4 passes through the film passage 14, the restriction on the projecting pin 22 is released, and the projecting pin 22 moves to the projecting position as shown in FIG.

After rewinding, the photographic film cartridge 2
Is taken out of the camera. In the photographed film cartridge 2 which has been taken, all the hands of the photograph film 4 are wound in the cartridge body 3 like the unused ones, but the used film which is applied to the head of the projecting pin 22 through the through hole 17 is used. By checking the display 22b, it is possible to identify whether or not it has been used. Even if the used photo film cartridge 2 is reloaded into the camera, the projecting pin 22 completely blocks the film passage 14, so that the photo film 4 is prevented from being sent out and is photographed again. There is no such thing.

The used photographic film cartridge 2 is submitted to the photo lab. In the used photo film cartridge 2, the projecting pin 22 moving to the projecting position prevents the photo film 4 from being fed out. As for the operation, as shown in FIG. 4, the jig 24 having a slender tip is inserted into the through hole 17, and the projecting pin 22 is moved to the retracted position. Thereby, the groove 2
Since the projection 19a is engaged with 2a and the projecting pin 22 is held in the retracted position, the photographic film 4 can be fed out.

In the embodiment described above, the photographic film 4 is used.
Although the protruding pin 22 and the spring 20 are used to prevent the passage of the spring, the bending portion 30 having elasticity by cutting out a part of the lower case 3b as in the second embodiment shown in FIGS. 5 and 6. The bending member 30 may be integrally formed with the protruding member 31 so as to protrude into the film passage 14. The through hole 33 into which the jig 24 is inserted at the developing station is
It is formed at a position outside the range where the photographic film 4 is passed when the film entrance / exit 13 is viewed from the front. When the jig 24 is inserted at the developing station, the tip of the jig 24 presses the base of the bending portion 30, and the protruding member 31 moves to the retracted position described above. Incidentally, in FIG. 6, the telescope 16 which is visible in the back of the film passage 14 is omitted in order to prevent the drawing from being complicated.

At the developing station, the spool 5 is rotated in the film feeding direction with the jig 24 inserted in the through hole 33, and the exposed film 4 is fed. The jig 24 may be removed after the tip 4b of the photographic film 4 has passed through the projecting member 31. According to this, since the photographic film 4 can be pulled out while the jig is inserted into the through hole 33 at the developing station, scratches and the like between the projecting pin 22 and the photographic film 4 do not occur.

Further, in the first embodiment, the cartridge main body 3 needs to be disassembled in order to return the projecting pin 22 held in the retracted position to the position shown in FIG. Since the photographic film 4 can be fed with the tool inserted in the through hole 33, the cartridge main body 3 can be recycled.

7 to 9 show another example of the display mechanism used in the above-mentioned first embodiment. The protruding pin 22 shown in FIG. 1 is biased by a spring 22 so as to surely enter the lower side of the through hole 17 when it moves to the protruding position. FIG. 7 is a view of the through hole 17 shown in FIG. 1 which is horizontally broken and the broken surface is viewed from above with the film inlet / outlet 13 in front. A display window 42 is provided in the upper case 3a, and the through hole 1 into which the display window 42 and the protruding pin 22 enter.
A lever 41, which is provided rotatably around a shaft 40, is supported between the lever 41 and the shaft 7.

The lever 41 is provided with the characters "front" indicating the unused state and "rear" indicating the used state at a position corresponding to the display window 42, and the display window 42 shows "front". It is freely movable within a range where any of the characters "and" is exposed. Further, the spring 43 biases the lever 41 in the counterclockwise direction, and when the photographic film cartridge 2 is in an unused state, the word "front" is exposed on the display window 42.

FIG. 8 is a sectional view of the lever 41 taken along the line XX in FIG. 7 and viewed in the direction of the arrow. The lever 41 has an inclined surface 41 a on the side pressed by the protruding pin 22.
As shown in FIG. 9, when the photographic film cartridge is in the used state and the projecting pin 22 is pressed against the inclined surface 41a, the lever 41 rotates clockwise against the spring 43, The display window 42 is moved to a position where the character "rear" is exposed. As a result, the user can
It is possible to discriminate the unused state and the used state of the photo film cartridge 2 from the characters seen from 2.

In the first embodiment, the ribs 11 and 12 are used to prevent the photographic film 4 from being loosened, but, for example, as disclosed in Japanese Patent Laid-Open No. 1-306845, The outer peripheral edge of the photographic film roll is regulated by the annular projection formed on the flange edge,
A protrusion for releasing the regulation by the annular protrusion may be provided in the vicinity of the photo film passage opening. Also, spool 4
Is composed of two parts each having a flange, as disclosed in, for example, Japanese Patent Laid-Open No. 1-306844, and when the spool is rotated in the anti-rewind direction, the flanges come close to each other and hold the photographic film roll. However, the rotation of the spool may be transmitted to the outer peripheral portion of the photographic film. Further, as disclosed in Japanese Patent Application No. 1-172594, the side surface of the flange is pressed against the photographic film roll side by a protrusion provided on the inner wall of the cartridge body, and a part of the flange is deformed so that the photographic film roll is deformed. You may make it pinch the outermost peripheral part. As described above, the mechanism for feeding the photographic film from the tip thereof by the rotation of the spool is not limited to the above-mentioned publications, and various known methods can be used.

[0024]

As described above, according to the photographic film cartridge of the present invention, the movement of the projecting member provided in the film passage prevents the photographic film from being sent out of the main body of the film, so that it is simple. With this mechanism, it is possible to reliably prevent double exposure of the photographic film.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the vicinity of a film entrance / exit of a photographic film cartridge according to a first embodiment.

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

FIG. 3 is a cross-sectional view showing a state where the protruding pin shown in FIG. 1 has moved to a protruding position.

FIG. 4 is a cross-sectional view showing a state in which the protruding pin shown in FIG. 1 is retracted from the film passage.

FIG. 5 is a sectional view showing an essential part of a photographic film cartridge according to a second embodiment.

FIG. 6 is a cross-sectional view of the protruding pin shown in FIG. 5 taken along the axial direction of the spool and seen from the film inlet / outlet side.

FIG. 7 is a schematic explanatory view showing the display mechanism described in the third embodiment.

8 is a sectional view of the lever shown in FIG. 7 taken along line XX and seen from the direction of the arrow.

FIG. 9 is a schematic explanatory view showing a state of the display mechanism when the photographic film cartridge is in a used state.

[Explanation of symbols]

 2 Photo film Patrone 4 Photo film 13 Film entrance / exit 14 Film passage 17 Through hole 19 Hole 22 Projecting pin 22a Used indication 30 Bending part 31 Projecting member

Claims (1)

[Claims] 1. A photographic film cartridge having a structure in which a spool is rotated so that the photographic film is sent out from the film entrance and exit through a film passage to the outside of the cartridge main body, and a protruding position for preventing passage of the photographic film in the film passage. A movable projecting member is provided on the photo film, and in the unused state, the projecting member abuts against the photo film in the film passage to prevent movement to the projecting position, and the tip of the photo film crosses the film passage after use. A photographic film cartridge which is moved to the projecting position when the film is caught in the main body of the cartridge and prohibits the sending of the photographic film out of the main body of the cartridge from the film entrance / exit.