JPH06265988A - Film feeding mechanism for camera - Google Patents

Abstract

PURPOSE:To provide a film feeding mechanism for a camera for surely moving film fed from a film cartridge to a desired position. CONSTITUTION:This mechanism is provided with a communicating guide part installed between a film feed port 16a of the film cartridge 16 and a film feed path formed by a film guiding rail 4 and a film pressure plate 11, and guiding the film 17 fed from the film cartridge 16 to the film feed path. As to the size of an aperture part 11d on the film cartridge side in the communicating guide part, it is set specified amount larger in the thickness direction of the film 17 than on the film feed port 16a side, and as to an aperture part 11e on the film pressure plate 11 side, a surface 11b on the film pressure plate 11 side is formed on nearly the same plane as a film guiding rail 5 and a surface 11c on an aperture 3 side is formed to be specified amount more forward than the rail 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film feeding mechanism for a camera, and more particularly to a camera for feeding a film from an opening of the film cartridge by rotating a winding shaft in the film cartridge. The present invention relates to a film feeding mechanism.

[0002]

2. Description of the Related Art Conventionally widely used ISO standard 10
In the 135-size film containing a patrone of 07-1979 (hereinafter referred to as a film patrone), the film leader portion is already pulled out from the film patrone main body when it reaches the user. When the user loads the film cartridge into the camera, the film leader is pulled out and loaded at a position instructed by the camera in advance, or the film reader is wound around a take-up spool and the back lid of the camera is closed. I was using it.

FIG. 10 is a sectional view showing a film feeding mechanism of a conventional camera, showing a state in which a film is pulled out from a film cartridge and loaded in the camera body.

In this conventional camera, when the film cartridge 16 conforming to the above standards is loaded into the cartridge chamber 106 of the camera body 101, the leader portion of the film 17 is pulled out from the film cartridge 16 and the leader portion is pulled out. The tip is placed so as to reach a film winding chamber (not shown). After that, when the back cover 115 is closed, the film pressure plate 111 is pressed against the contact surface of the film guide rail arranged on the known rail, and the film feeding path is formed between the known film guide rail 104 and the film pressure plate 111. Is formed. The film 17 is pressed by the film pressure plate 111, guided by the film guide rail 104, and fed.

As shown in FIG. 11, the film pressure plate 1 is
11 is elastically biased toward the front of the camera body 101 by a pressure spring 112 arranged between the back side of the film feeding surface and the back cover 115. The pressure spring 11
Reference numeral 2 denotes a leaf spring of four arms which is bent and extended obliquely in the left and right direction from the central portion toward the rear of the camera body 101 at the upper and lower portions thereof, and the tip end portions of the leaf springs of the four arms are further bent. , Each has a fork formed. Then, it is fixed to the back surface side of the film pressure plate 111 with rivets 113 at the central portion, and further fixed to the back lid 115 with rivets 114 at each fork portion.

On the other hand, Japanese Unexamined Patent Publication No. 4-190339 discloses a film positioning mechanism for a camera in which a member for regulating the position of the film in the thickness direction and the width direction is arranged near the opening of the film cartridge. . In the film positioning mechanism of this camera, the position of the film in the thickness direction is regulated by the inclined surface formed by the camera body and the film pressure plate, and the position of the film in the width direction is regulated separately by the regulating member protruding from the camera body. There is.

[0007]

However, the above-mentioned FIG.
In the conventional film feeding mechanism of the camera shown in (1), it is difficult to reliably control the position (thickness direction, width direction) of the film fed from the film cartridge, and there is a possibility that the film feeding may be defective.

Further, the technical means disclosed in the above-mentioned Japanese Patent Laid-Open No. 4-190339 separately controls the position of the film in the thickness direction and the position of the film in the width direction, which also makes it difficult to reliably feed the film. Met.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a film feeding mechanism of a camera for surely feeding a film fed from a film cartridge to a desired position.

[0010]

In order to achieve the above object, a film feeding mechanism of a camera according to the present invention is arranged such that an opening of a film cartridge for accommodating a film is rotated to rotate an opening of the film cartridge. In a film feeding mechanism of a camera for feeding a film from a section, a film guide rail is provided above and below the photographing opening in parallel with the film feeding direction to regulate the position of the film in the thickness direction, and the film guiding rail. A film guide rail, which is arranged outside the rail in parallel with the film feeding direction and is higher than the film guide rail and regulates the upper and lower edge positions of the film, and presses against the contact surface of the film guide rail. Is installed and installed, and the film passes between it and the film guide rail. A film pressure plate to form a space that,
An opening portion of the film cartridge and a communication guide portion provided between the film guide rail and the space formed by the film pressure plate, and a communication guide portion for guiding the film delivered from the film cartridge to the space, In the communication guide portion, the size of the opening on the film cartridge side is increased by a predetermined amount in the thickness direction of the film with respect to the opening of the film cartridge, and
In the opening on the film pressure plate side, the surface on the film pressure plate side is formed substantially on the same plane as the film guide rail, and the surface on the photographing opening side is formed a predetermined amount forward of the film guide rail surface.

[0011]

In the present invention, by rotating the winding shaft in the film cartridge for accommodating the film, the film is sent out from the opening of the film cartridge, and after passing through the communication guide portion, the film guide rail. The film is made to reach the space formed by the film pressure plate.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a central transverse sectional view of a film feeding mechanism of a camera showing a first embodiment of the present invention, and FIG. 2 is a central longitudinal sectional view of a film feeding mechanism of the camera.
FIG. 3 is a rear view showing the camera to which the film feeding mechanism of the camera of the first embodiment is applied, with the back cover removed. Further, FIG. 7 is an enlarged perspective view of an essential part showing the vicinity of the connecting portion between the cartridge chamber and the aperture in the camera.

The camera to which this first embodiment is applied has a normal photographing function, and as shown in FIG. 3, an aperture 3 is formed in the center of the camera body 1. A film guide rail 4 is provided on the upper and lower sides of the aperture 3 of the camera body 1 in parallel with the film feeding direction. Further, a film guide rail 5 is arranged outside the film guide rail 4 in parallel with the film guide rail 4. The height of the film guide rail 5 is slightly higher than that of the film guide rail 4, and the upper end surface of the film guide rail 5 (the rear side surface of the camera body 1) contacts the film guide surface of the film pressure plate 11 described later. I have come into contact with them. A film feed path is formed by the film guide surface of the film pressure plate 11, the inner wall surfaces of both film guide rails 5 and the film feed surface including the film guide rail 4. The film sent out from the film cartridge is transported in the film feeding path, at this time, the film guide rail 4 is positioned in the thickness direction of the film, and the film guide rail 5 is positioned in the vertical direction of the film. It is designed for positioning.

A patrone chamber 6 proposed in, for example, US Pat. No. 4,834,306 is provided on one side of the aperture 3 and is loaded in association with a rotary shaft provided in the camera body 1. Further, the leader portion of the film stored in the main body of the film cartridge is sent out from the opening portion of the film cartridge. On the inner upper surface of the cartridge chamber 6, a cartridge fork portion 7 as a spool engaging member is formed so as to project, and engages with a supply spool in the loaded film cartridge, for example, as disclosed in Japanese Patent Laid-Open No. 2-67534. It is adapted to be driven by a known film feeding mechanism disclosed.

A spool chamber 9 is arranged on the other side of the aperture 3. Inside the spool chamber 9, a take-up spool 8 and a film transfer roller 10 pressed by the take-up spool 8 are arranged. Further, a film transfer roller is also provided at a position on the back cover (not shown) that faces the film transfer roller 10, and when the back cover is closed, the film transfer rollers are pressed against each other to automatically move the film leader portion sent out. It is supposed to be sent to.

Further, in FIG. 3, reference numeral 2 is a back cover engaging groove 2 formed on the back side of the camera body 1, and is adapted to be engaged when a back cover (not shown) is closed.

As shown in FIGS. 1 and 2, when the back cover 15 is closed, a film pressure plate 11 elastically biased by a pressure spring 12 is disposed on the back cover 15 behind the aperture 3. There is. The film pressure plate 11 is elastically biased toward the front of the camera body 1 by a pressure spring 12 arranged between the back side of the film feeding surface and the back cover 15.

FIG. 4 is an enlarged perspective view of an essential part showing the film pressure plate 11 and the pressure spring 12.

In the figure, the upper surface of the base portion 11a of the film pressure plate 11 abuts on the upper end surface of the film guide rail 5 to form a film feeding path between the film guide rail 4 and the film guide rail 11aa. Has become. A communication guide portion 21 which is arranged on one side of the base portion 11a in the vicinity of the opening of the film cartridge 16 and spatially connects the opening and the film guide surface 11aa.
Are formed to project. The film 17 delivered from the opening of the film cartridge 16 is guided toward the film guide surface 11aa. This communication guide portion 21 is provided when the back cover 15 is closed.
Between the aperture 3 and the cartridge chamber 6 of the camera body 1, a recess 1b formed forward is loosely fitted.

On one end surface of the communication guide portion 21 on the side of the cartridge chamber 6 is formed an opening portion 11d having a rectangular cross section and serving as an insertion port for the film 17 leader portion fed from the film cartridge 16. The other end surface has an opening 11e having a rectangular cross section smaller than the opening 11d and serving as a discharge port of the leader portion of the film 17.

In the rectangular shape of the opening 11d, the height direction is sufficiently larger than the thickness of the film 17, and the width direction is larger than the width of the film 17. The rectangular shape of the opening 11e is smaller than the opening 11d, but is slightly larger than the thickness and width of the film 17 in both the height direction and the width direction. Further, the opening 11d is arranged at a predetermined distance from the film delivery port 16a of the film cartridge when the back cover 15 is closed.

FIG. 5 shows the communication guide portion 21 in FIG.
FIG. 6 is a side view seen in the direction of arrow A, and FIG. 6 is a sectional view of the communication guide portion 21 seen in the direction of arrow B in FIG.

The four surfaces of the communication guide portion 21 that connect the two rectangular openings 11d and 11e are
As shown in the drawing, the film guide surfaces 11b, 11c, 11f and 11g are formed so as to taper from the opening 11d to the opening 11e. When the back cover 15 is closed, the ends of the film guide surfaces 11f and 11g in the opening 11e are substantially flush with the inner side surface of the film guide rail 5, and the ends of the film guide surface 11b in the opening 11e are close to each other. On the same plane as the upper end surface of the film guide rail 5,
The end of the film guide surface 11c at e is located a predetermined amount forward of the upper end surface of the film guide rail 4.

Therefore, the film guide surface 11
b and 11c are the positions in the thickness direction of the film 17,
The film guide surfaces 11f and 11g regulate the position of the film 17 in the width direction, and guide the film 17 toward the film guide surface 11aa of the base portion 11a.

As shown in FIG. 4, the pressure spring 12 is a four-arm leaf spring 12a which is bent upward and downward from the center toward the rear of the camera body 1 in the left and right directions.
Are formed, and the tip ends of the leaf springs 12a of the four arms are further bent to form forks 12b, respectively. Then, it is fixed to the back surface side of the film pressure plate 11 with a rivet 13 at the central portion, and further fixed to the back cover 15 with a rivet 14 at each fork 12b.
The rivet 14 is formed integrally with the back cover 15,
The guide portion 14a engages with the fork 12b, and the step portion 1
It is prevented from falling off by 4b.

The back cover 15 can be opened by a counterclockwise rotation by a hinge (not shown) at the right end of the camera body 1.

After the film cartridge 16 is loaded in the cartridge chamber 6, the supply spool 18 arranged inside the cartridge body is engaged with the cartridge fork portion 7 arranged in the cartridge chamber 6. It is like this. By rotating the patrone fork portion 7 in the counterclockwise direction, the film 17 is fed out from the film feed-out port 16a serving as a film feed-out port.

In FIG. 1, reference symbol L is a distance in the thickness direction of the film in the above-described film feeding path, which is determined by a step between the upper end surface of the film guide rail 4 and the upper end surface of the film guide rail 5. The distance L is a distance obtained by adding a slight void to the thickness of the film 17.

As shown in FIGS. 1 and 7, in the camera body 1, the connecting portion between the aperture 11e of the communication guide portion 21 and the aperture 3 is provided with an inclination similar to that of the film guide surface 11c. The film guide slope 1a
Is formed so as to regulate and guide the position of the film 17 in the thickness direction. In the vicinity of the film guide slope 1a at one end of the film guide rail 5, a film guide slope 5a having the same slope as the slope is formed. Then, the position in the width direction of the film is regulated and guided. Also,
In FIG. 7, reference numeral 5b is a film guide port, which is larger than the width of the film 17.

The operation of this embodiment configured as described above will be described.

First, the film cartridge 16 shown in FIG.
The supply spool 18 of 1 is engaged with the cartridge fork portion 7 of the cartridge chamber 6 and loaded. At this time, the film 17 is discharged from the film delivery port 16a of the film cartridge 16.
The reader part is not exposed.

Next, when the back cover 15 is closed, a back cover switch (not shown) is turned on, and the film drive motor (not shown) is energized by this signal, and the cartridge fork portion 7 is turned on.
Rotate counterclockwise. Since the cartridge fork portion 7 is engaged with the supply spool 18 of the film cartridge 16, the supply spool 18 also rotates counterclockwise,
The film 17 leader section is sent out from the film sending-out port 16a.

The leader portion of the film 17 delivered from the film delivery port 16a is inserted through the opening 11d of the communication guide portion 21 having a large opening. Since the base portion of the film 17 is formed of a thin synthetic resin material, the film guide surface 11 can be wound or curled around the supply spool 18 of the film cartridge 16 due to the curling.
While reaching b, 11c, 11f and 11g, they reach the opening 11e of the communication guide portion 21.

The film 17 that has passed through the opening 11e
The position of the leader portion in the thickness direction is regulated by the film guide surface 11aa (see FIG. 4) and the film guide slope 1a (see FIG. 1) of the base portion 11a, and the width direction position is regulated by the film guide slope 5a. While being in contact with a flat surface or a slope, the film is transported through the film feeding path interval L (see FIG. 1), passes through the aperture 3, and reaches the spool chamber 9,
It is wound around the take-up spool 8.

According to the first embodiment as described above, the unstable film front end portion is formed by the communication guide portion 21 which is one member.
The position of the film in the thickness direction and the width direction can be regulated with the film being stabilized, the film can be fed stably to the camera body side, and further reliably transferred to the film feeding path by the film guide on the camera body side. be able to.

Next, the film feeding mechanism of the camera of the second embodiment of the present invention will be described.

FIG. 8 is a central cross-sectional view of the film feeding mechanism of the camera showing the second embodiment. FIG. 9 is an enlarged perspective view of an essential part showing the film pressure plate and the pressure spring in the second embodiment.

The second embodiment differs from the first embodiment only in the shape of the communication guide portion 21 of the film pressure plate 11, and the other constructions and functions are the same as those of the first embodiment. The description of is omitted.

As shown in FIGS. 8 and 9, the communication guide portion 21 'in the second embodiment is formed such that the rear side of one end face on the side of the cartridge chamber 6 is projected toward the cartridge chamber 6 side. 11h is formed. Then, by the film guide 11h, the cartridge chamber 6
When the film cartridge 16 is loaded in the film, the film outlet 16a is shielded.

[0041]

As described above, according to the present invention, it is possible to provide the film feeding mechanism of the camera for surely feeding the film fed from the film cartridge to a desired position.

[Brief description of drawings]

FIG. 1 is a central cross-sectional view of a film feeding mechanism of a camera according to a first embodiment of the present invention.

FIG. 2 is a central longitudinal sectional view of a film feeding mechanism of the camera showing the first embodiment.

FIG. 3 is a rear view showing the camera to which the film feeding mechanism of the camera of the first embodiment is applied, with the back cover removed.

FIG. 4 is an enlarged perspective view of essential parts showing a film pressure plate and a pressure spring in the film feeding mechanism of the camera of the first embodiment.

FIG. 5 is a side view of the communication guide portion in the film feeding mechanism of the camera of the first embodiment as seen in the direction of arrow A in FIG.

FIG. 6 is a cross-sectional view of the communication guide portion in the film feeding mechanism of the camera of the first embodiment, viewed in the direction of arrow B in FIG.

7 is an enlarged perspective view of an essential part showing the vicinity of a connecting portion between a cartridge chamber and an aperture in the camera shown in FIG.

FIG. 8 is a central transverse sectional view of a film feeding mechanism of a camera showing a second embodiment of the present invention.

FIG. 9 is an enlarged perspective view of essential parts showing a film pressure plate and a pressure spring in the film feeding mechanism of the camera of the second embodiment.

FIG. 10 is a central transverse sectional view showing an example of a film feeding mechanism of a conventional camera.

11 is an enlarged perspective view of essential parts showing a film pressure plate and a pressure spring in the film feeding mechanism example of the camera shown in FIG.

[Explanation of symbols]

 1 ... Camera body 1a ... Film guide slope 2 ... Back cover engaging groove 3 ... Aperture 4 ... Film guide rail 5 ... Film guide rail 5a ... Film guide slope 6 ... Patrone chamber 7 ... Patrone fork 8 ... Take-up spool 9 ... Spool chamber 10 ... Film transfer roller 11 ... Film pressure plate 11a ... Base portion 11a 11aa ... Film guide surface 11b, 11c, 11f, 11g ... Film guide surface 11d ... Opening portion (insertion port) 11e ... Opening portion (discharge port) 12 ... Pressure spring 15 ... Back cover 16 ... Film cartridge 16a ... Film delivery port 17 ... Film 21 ... Communication guide section

Claims (1)

[Claims] 1. A film feeding mechanism of a camera for feeding a film from an opening portion of the film cartridge by rotating a take-up shaft in the film cartridge containing the film, wherein the film is provided above and below the photographing opening portion. A film guide rail that is arranged parallel to the feed-out direction and regulates the position of the film in the thickness direction, and a rail that is outside the film guide rail and is parallel to the film feed-out direction and higher than the film guide rail. And a film guide rail that regulates the upper and lower edge positions of the film, and a film that is installed by being pressed by the contact surface of the film guide rail and that forms a space through which the film passes between the film guide rail and the film guide rail. The pressure plate, the opening of the film cartridge, and the film guide A communication guide portion that is provided between the rail and the space formed by the film pressure plate and that guides the film sent out from the film cartridge into the space; and the communication guide portion on the film cartridge side. The opening size is increased by a predetermined amount in the thickness direction of the film with respect to the opening of the film cartridge, and in the opening on the film pressure plate side, the surface on the film pressure plate side is substantially flush with the film guide rail. A film feeding mechanism for a camera, wherein a surface on the photographing opening side is formed a predetermined amount forward of the film guide rail surface.