JPH05142647A - Method for locking leading edge of photographic film, film unit with lens and camera - Google Patents

Abstract

PURPOSE:To perfectly draw out exposed film from a cartridge without damaging the film by winding photographic film by a take-up shaft in a state where parts before and behind a part where the root of a leader part is interposed are bent in an S shape. CONSTITUTION:In the case of winding unexposed film 8 in a roll state, the film 8 is wound to a winding shaft 25 by rotating the shaft 25 in a take-up direction in a state where the root of the leader part 8a is inserted in the slit 25a. At such a time, the leading edge of the leader part 8a is necessarily in a projecting state from one frontage of the slit 25a. The slit 25a is formed so that the frontage part which bends the leader part 8a in the S shape may be a curved surface, and by rotating the winding shaft 25 in the film take-up direction, that is, in a direction shown by an arrow, the parts before and behind the part where the root of the leader part 8a is interposed are bent in the S shape by the curved surface. Since the curved surface is provided, the leader part 8a is not bent in a Z shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for locking the leading end of a photographic film on a take-up shaft, a film unit with a lens, and a camera.

[0002]

2. Description of the Related Art Conventionally, there is a film unit with a lens (hereinafter referred to as a "film unit") disclosed in Japanese Patent Publication No. 2-36251. As shown in FIG. 8, this film unit is a body base 2 in which a taking lens, a film winding mechanism and a shutter mechanism are incorporated, and a film 3 with a cartridge, which is previously defined in the international standard ISO 1007-1979, is light-tight. It has a structure in which it is housed and a back cover 4 is light-tightly attached to the back of these.

The body base 2 is provided with a film supply chamber 6 and a film winding chamber 7 on the left and right of the exposure frame 5. In the film winding chamber 7, a cartridge 9 having an axis 9a that locks the end of the unexposed film 8 is arranged. In the film supply chamber 6, the unexposed film 8 previously drawn from the cartridge 9 is stored in a roll shape. The user who purchases the film unit, the film core 8 of the cartridge 9 provided with the exposed film 8 in the film winding chamber 7 for each shooting
When the film unit is wound up on a and the entire exposure is completed, the development unit is requested to develop the film unit. At the photo lab, the film cartridge 9 on which the exposed film has been wound is taken out, and processing such as development and printing is performed using the current development processing system, and the print photograph and the film negative are returned to the user, and The film unit from which the cartridge 9 is taken out is not returned for convenience.

By the way, the film 3 with a cartridge is loaded in a dark room by using a loading jig shown by a chain double-dashed line in FIG. First, the cartridge 9 is held by the grip arm 11, and the leading end of the unexposed film 8 pulled out from the cartridge 9 is inserted into the slit 12 a of the winding shaft 12. After that, the unexposed film 8 is wound around the outer circumference of the film by rotating the winding shaft 12 in the film winding direction. The unexposed film 8 has a leader portion 8a having a narrow width formed at the tip thereof as shown in FIG. 9, and is wound with only the leader portion 8a inserted in the slit 12a. Since the shape of the slit 12a of the winding shaft 12 is a groove partitioned by a straight line when seen from a plane,
L at the corner of one of the front edges of the slit 12a
The film roll 10 is formed in a bent state.

After the film roll 10 is formed, the spread portion 14 between the film cartridge 9 and the film roll 10 is formed.
Is supported by the support plate 15 so as to be curved slightly upward. The patrone 9 and the film roll 10 held by these loading jigs are the loading jig and the shaft core 9 of the cartridge 9.
By moving in the direction a, each opening 6a, 7
It is loaded into a predetermined position of the main body base 2 through a. After loading, the grip arm 11 is released and
The winding shaft 12 is bent at the slit 12a to have a small diameter. As a result, each of the loading jigs is retracted in the direction of the axis 9a and covered with the back cover 4 to obtain the state shown in FIG.

[0006]

However, in the above-mentioned film unit, since the leader portion 8a of the film roll 10 is bent into an L shape when the film roll 10 is formed, the exposed film 8 is transferred from the cartridge 9 to the leader at the developing shop. When pulling out from the section 8a, the cartridge 8
The root of the leader portion 8a may be caught near the film entrance / exit. If the exposed film 8 is pulled out as it is, the exposed film 8 is torn along the length direction from the caught portion, and the developing process cannot be performed.

The present invention has been made in view of the background as described above, and a method for locking the leading end portion of a photographic film, a film unit, and a camera devised so that the exposed film can be safely withdrawn without damaging the exposed film. The purpose is to provide.

[0008]

In order to achieve the above object, according to the invention described in claim 1, a photographic film drawn from a photographic film cartridge is mounted on a take-up shaft from a leader portion having a narrow end. Inserted into the opening on one side of the slit provided, pull out the leader portion from the opening on the other side of the slit to a position where the root of the leader portion enters into the slit, and set the winding shaft in the film winding direction. By rotating the take-up shaft, the photographic film is wound while the front and rear parts sandwiching the root of the leader part are bent into an S shape.

According to another aspect of the present invention, there is provided a film supply chamber having a taking lens, the unexposed film roll being housed on one side of the taking lens, and the end of the unexposed film on the other side of the taking lens. In a film unit having a film winding chamber in which a cartridge fixed in advance to the winding core is arranged, the unexposed film roll has a front portion and a rear portion sandwiching the root of the leader portion having a narrow tip end.
It is stored in a bent shape.

According to the third aspect of the present invention, a film supply chamber having a taking lens and having a rotatable winding shaft on one side sandwiching the taking lens, and an unexposed side on the other side of the taking lens. In a film unit having a film winding chamber in which a cartridge is arranged so that the end of the film is fixed in advance to the winding core, a slit provided through the winding shaft, and provided on both sides of this slit, A curved surface for bending the unexposed film by the rotation of the winding shaft, wherein the unexposed film has the winding shaft in a state in which the base of the leader portion having the narrowed tip end intervenes in the slit. By rotating in the winding direction, the front and rear parts sandwiching the root of the leader part are wound around the winding shaft in a state of being bent in an S shape.

According to another aspect of the present invention, there is provided a photographic lens, which is arranged on one side sandwiching the photographic lens and in which a cartridge is loaded, and a photographic film on the other side of the photographic film. In a camera provided with a film winding chamber in which a winding shaft for winding from the tip is arranged, a slit provided so as to penetrate the winding shaft,
The base of the leader portion, which is provided on both sides of this slit and which bends the photographic film by rotation of the winding shaft and the inner wall forming the film winding chamber, has a narrow width at the tip of the photographic film. And an insertion groove into which the tip of the leader section is inserted with the slit intervening in the slit, and the photographic film is located before and after sandwiching the root of the leader section by rotation of the winding shaft in the film winding direction. It is wound around the winding shaft in a state where the portion is bent in an S shape.

[0012]

EXAMPLE A first example will be described. In this example,
The same film unit as described in the prior art is used, and this structure has a main body base 2 made by molding plastic as shown in FIG. 8 and a back side that closes the rear side opening of the main body base 2 in a light-tight manner. It is composed of a lid 4. The main body base 2 is provided with a taking lens 16, a shutter mechanism 17, a finder window, a release button, a film winding mechanism, and the like. The photographing is always covered by an outer case (not shown), and holes for exposing the photographing lens 15, the release button, etc. are opened in the outer case so that the user can operate through these holes.

As shown in FIG. 8, the main body base 2 is formed with an opening 2a extending from the back surface to the bottom surface, and the shape of the back cover 4 is determined so as to shield the opening 2a in a light-tight manner. The main body base 2 is provided with a film supply chamber 6 and a film winding chamber 7 so as to sandwich the exposure frame 5. On the upper wall of the film winding chamber 7, interlocked with the operation of the winding knob 20,
A fork 21 for film winding, which rotates counterclockwise in the figure, projects. Further, the film supporting surface 22 on which the exposure frame 5 is formed is raised toward the back cover 4 side as shown in the drawing, and the sprocket 23 for operating the film winding mechanism is exposed above the film.

The cartridge 9 and the film 8 housed in the film supply chamber 6 and the film take-up chamber 7 are 35 mm film (135 film) with a cartridge defined by the international standard (ISO: 1007-1979 edition). The end of the film 8 is fixed to a winding core 9a provided on the cartridge 9.

The operation of winding the unexposed film 8 into a roll is performed by using the winding shaft 25 having the slit 25a as shown in FIG. The unexposed film 8 is wound around the winding shaft 25 by rotating in the winding direction with the root of the leader portion 8a inserted in the slit 25a. At this time, for example, if the perforation is a 35 mm film with 8 pitches for the shooting screen, the leader portion 8a is 38 mm.
And the diameter of the winding shaft 25 is 38 mm or less in order to form the film roll 10 with a small diameter.
The tip portion of the leader portion 8a is always in a state of protruding from one of the front openings of the slit 25a.

The slit 25a has a curved front portion for bending the leader portion 8a into an S-shape, and by rotating the winding shaft 25 in the film winding direction, that is, the arrow direction shown in FIG. The front and rear parts sandwiching the root of the part 8a are bent into an S shape. By providing these curved surfaces, the leader portion 8a is not bent into a Z shape. Then, the unexposed film 8 is attached to the winding shaft 25.
Then, the loading operation is performed in the same manner as described in the related art, and the back cover 4 is attached to the opening 2a of the main body base 2 to complete the assembly of the film unit. In this state, as shown in FIG. 1, the patrone 9 is arranged in the film winding chamber 7 with the core 9a engaged with the fork 21, and the film roll 10 is provided with the leader portion 8a in the hollow central portion thereof. The front and rear portions sandwiching the root are arranged in the film supply chamber 6 in a state of being bent in an S shape.

When the photographing is completed, all exposed films 8 are stored in the cartridge 9. As shown in FIG. 3, the exposed film 8 stored in the cartridge 9 is in a state in which an S-shape is gently drawn in the front and rear portions sandwiching the root of the leader portion 8a. Even if the film 8 is pulled out from the leader portion 8a, there is no danger of being caught in the film entrance 27.

Next, a second embodiment will be described. In this example,
This is an example in which a winding shaft 30 is provided in the film winding chamber 6 of the film unit described in the first embodiment. As shown in FIGS. 4 and 5, in the film winding chamber 31 of the film unit,
In advance, a winding shaft 30 around which the unexposed film 8 is wound around the leader portion 8a is rotatably provided. Winding shaft 30
Is provided with flanges for aligning both edges of the unexposed film 8 at both ends thereof, and a slit 30a penetrating between these flanges is formed. Further, the slit 30a has a curved front portion for bending the leader portion 8a into an S shape.

The unexposed film 8 is wound around the winding shaft 30 with the leader portion 8a of the unexposed film 8 inserted into the slit 30a. At this time, since the tip of the leader portion 8a is wound in a state of protruding from the one frontage of the slit 30a, the curved surface is formed on the front and back with the root of the leader portion 8a sandwiched.
Bend into a letter shape. Then, the film roll wound around the winding shaft 30 is rotatably arranged in the film supply chamber 31, and the cartridge 9 is arranged in the film winding chamber 7 with the winding core 9a engaged with the fork 21. To do. Then, by attaching the back cover 4 to the back surface of the main body base 2, the state shown in FIG. 5 is obtained. At this time, the film roll wound around the winding shaft 30 tends to be unwound due to its own curling habit, but the outermost periphery thereof is regulated by the wall surface defining the film supply chamber 6, so It will become calm with the diameter.

When the photographing is completed, all exposed films 8 are stored in the cartridge 9. At this time, since the leader portion 8a of the exposed film 8 is simply inserted into the slit 30a, the engagement with the winding shaft 30 can be easily released. This makes the Patrone 9
As shown in FIG. 3, the exposed film 8 stored in the S-shape is in a state in which an S-shape is gently drawn in the front and rear portions sandwiching the root of the leader portion 8a. Even if it is pulled out from the leader portion 8a, there is no fear of being caught in the film entrance 27.

Next, a third embodiment will be described. In this example, the structure of the film winding chamber 37 will be described in which the photographic film is loaded into the camera in a state where the leading end of the photographic film is bent into an S shape. The camera is equipped with an automatic loading, automatic winding and automatic rewinding mechanism, and as shown in FIG. 6, a film supply chamber 36 and a film winding chamber 37 are arranged on both sides of the exposure frame 35. For loading, the film supply chamber 36 is loaded with a cartridge, and the leader portion pulled out from the cartridge is engaged with the winding shaft 38 of the film winding chamber 37. As shown in FIG. 7, the winding shaft 38 has a slit 38a penetrating therethrough.
Is provided. The slit 38a is the leader portion 8a.
Both sides of the slit 38a for bending the S-shape into a S-shape are curved.

By the way, when the leader portion 8a is inserted into the slit 38a so that the root of the leader portion 8a is positioned inside the slit 38a, the leading end portion of the leader portion 8a projects from one of the front openings of the slit 25a and then the film. It may come into contact with the inner wall forming the winding chamber 37, and may not be inserted any further. Therefore, the film winding room 3
An insertion groove 4 for inserting the leader portion 8a of the photographic film, which has passed through the slit 38a, from the tip thereof
0 is provided. The insertion groove 40 is formed on the wall surface of the film winding chamber 37 along the insertion direction of the slit 38a when the winding shaft 38a is in the initial position shown in FIG. Further, the insertion groove 40 is formed with a depth such that the root of the leader portion 8a is located inside the slit 38a when the tip of the leader portion 8a is pressed against the inside thereof.

The operation of the camera described above will be described.
The cartridge is loaded in the film supply chamber 36, the leader portion 8a pulled out from the cartridge is inserted into the slit 38a of the winding shaft 38, and when further pushed, the tip of the leader portion 8a enters the insertion groove 40. When loading, take-up shaft 3
8 is always in the initial position, and the insertion groove 40 has the film winding chamber 37 along the insertion direction of the slit 38a.
Since it is formed on the wall surface of, the leader portion 8a can be easily inserted into the insertion groove 40.

When the operation is performed until the tip of the leader portion 8a is pushed into the depth of the insertion groove 40, the root of the leader portion 8a is surely inserted into the slit 38a. Then, when the back cover 42 of the camera is closed, this is detected and the camera rotates the winding shaft 38 in the film winding direction, that is, in the arrow direction shown in FIG. As a result, the unexposed film is wound into the winding shaft 38 in a state in which the front and rear of the root of the leader portion 8a are sandwiched by the curved surface of the slit 38a and bent in an S shape.
Is wound around. The rotation of the take-up shaft 38 causes the exposure frame 35 to rotate.
The first exposure screen is set until the first exposure screen is set, and then stopped.

After the photographing is completed, the fork 44 and the take-up shaft 38, which are engaged with the axis of the cartridge, are rotated in the film rewinding direction, and the exposed film wound around the take-up shaft 38 is removed. Store in the Patrone. The rotation of the fork 44 and the winding shaft 38 is performed until all the exposed film is stored in the cartridge. The rotation stop position of the winding shaft 38 after the film is rewound is always stopped at the initial position.

After the storage is completed, the exposed film stored in the cartridge has a leader portion 8 as shown in FIG.
Since an S-shape is gently drawn before and after sandwiching the base of a, there is no fear that the exposed film will be caught in the film entrance / exit 27 even if the exposed film is pulled out from the leader portion 8a at the developing station.

In the camera described in the third embodiment,
The present invention is also applicable to a prewinding type camera in which the exposed film is sequentially wound up and the exposed film is rewound after the end of shooting, and all the exposed film is pre-wound after loading and rewound into the cartridge after each shooting. Needless to say, can be applied.

[0028]

As described above, according to the method for locking the leading end of a photographic film, the film unit, and the camera of the present invention, the leader portion of the unexposed film including the root thereof is formed by the winding shaft having a curved surface. Since the film is wound while being bent into an S shape, the exposed film can be safely pulled out from the cartridge at the developing station. Further, the structure for safely pulling out can be formed at low cost.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a lens-fitted film unit according to a first embodiment.

FIG. 2 is a perspective view showing a state in which a leader portion of a photographic film is inserted into a winding shaft.

FIG. 3 is a sectional view of a cartridge in which an exposed film is stored.

FIG. 4 is an exploded perspective view of a lens-fitted film unit according to a second embodiment.

5 is a cross-sectional view of the lens-fitted film unit shown in FIG.

FIG. 6 is a perspective view of a camera according to a third embodiment.

7 is a cross-sectional view showing the main parts of the camera shown in FIG.

FIG. 8 is an exploded perspective view of the lens-fitted film unit described in the related art.

FIG. 9 is a perspective view showing a state in which the leader portion of the photographic film described in the related art is inserted into the winding shaft.

10 is a sectional view of the lens-fitted film unit shown in FIG.

[Explanation of symbols]

 6,36 Film supply chamber 7,37 Film winding chamber 8a Leader section 9 Patrone 12,25 Winding shaft 12a, 25a, 30a, 38a Slit 30 Winding shaft

Claims (4)

[Claims] 1. A photographic film pulled out from a photographic film cartridge is inserted into an opening on one side of a slit provided in a winding shaft from a leader portion having a narrow tip end, and the leader portion is inserted into the slit. The root of the leader portion is pulled out from the opening on the other side to a position where the leader portion enters into the slit, and the winding shaft is rotated in the film winding direction, so that the winding shaft is positioned before and after sandwiching the root of the leader portion. A method for locking the leading end of a photographic film, characterized in that the photographic film is wound in a state where the portion is bent into an S shape. 2. A film supply chamber having a taking lens and containing an unexposed film roll on one side of the taking lens, and an end of the unexposed film fixed to a core on the other side of the taking lens in advance. In a film unit with a lens including a film winding chamber in which a cartridge is placed, the unexposed film roll is bent in an S-shape in the front and rear portions sandwiching the root of the leader portion having a narrow tip end. A film unit with a lens that is stored. 3. A film supply chamber having a taking lens and having a rotatable winding shaft on one side sandwiching the taking lens, and an end of an unexposed film on the other side of the taking lens is a core. In a film unit with a lens provided with a film winding chamber in which a fixed cartridge is arranged,
The unexposed film has slits penetrating the winding shaft, and curved surfaces provided on both sides of the slit to bend the unexposed film by the rotation of the winding shaft. By rotating the winding shaft in the film winding direction with the width of the base of the leader portion intervening in the slit, the front and rear portions sandwiching the base of the leader portion are bent into an S shape. The lens-fitted film unit is wound around the winding shaft. 4. A cartridge loading chamber which has a taking lens and is arranged on one side sandwiching the taking lens, in which a cartridge is loaded, and a take-up shaft for taking up a photographic film from its tip on the other side of the taking lens. In a camera having a film winding chamber in which the photographic film is arranged, and a slit provided through the winding shaft, and a slit provided on both sides of the slit, and the photographic film is bent by rotation of the winding shaft. A curved surface and an insertion groove provided on the inner wall forming the film winding chamber, into which the tip of the leader portion is inserted with the base of the leader portion having a narrow width at the tip of the photographic film intervening in the slit. The photo film is wound around the take-up shaft in a state in which the front and rear portions sandwiching the root of the leader portion are bent into an S shape by rotation of the take-up shaft in the film take-up direction. A camera that is characterized by being.