JPH04235542A - Camera - Google Patents

Abstract

PURPOSE:To surely load a film by forming a supporting piece in an exposure frame or the inside wall of the exposure-frame side of a film take-up room. CONSTITUTION:A camera has an exposure frame 17 through which an exposure opening for restricting the photographic range of a taking lens is formed, cartridge rooms 19 which are formed at both ends of the exposure frame 17 in such a way as sandwiching the frame 17 between them and into which a photographic film cartridge 2 is put, and a film take-up room 20 provided with a take-up spool 26 around which a film 3 sent out from the photographic film cartridge 2 is wound. A supporting piece 28 for supporting the film 3 is formed in the exposure frame 17 or the inside wall of the exposure-frame side of the film take-up room 20 and has its end made to protrude into a position near the exposure frame and distant from just above the take-up spool 26 by a maximum of 5mm.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a camera that uses a photographic film cartridge that stores up to the leading edge of the film inside the cartridge body when not in use, and more specifically, the present invention relates to a camera that uses a photographic film cartridge that stores up to the leading edge of the film inside the cartridge body when not in use. This invention relates to a camera whose leading end is reliably engaged with a winding shaft.

0002

2. Description of the Related Art Current photographic film cartridges store film with the leading end protruding from the cartridge body. 35 ways to use this photo film cartridge
In mm cameras, in order to easily load film, the leading end of the film is fed into the film winding chamber by the camera's feeding mechanism, and engaged with a winding shaft rotatably provided in the center of the film winding chamber. I'm letting you do it.

0003

[Problems to be Solved by the Invention] Recently, photographic film cartridges have been developed in which the leading edge of the film can be stored in the main body of the cartridge and loaded into the camera like a cassette even when unused.
It is disclosed in each publication of No. 06 and No. 4846418. In this type of photographic film cartridge, the cartridge shaft is rotated in the feeding direction with the fork of the camera.
In order to send the leading edge of the film out of the cartridge body, ribs and flanges press down on the outermost periphery of the film roll to prevent it from loosening. For this reason, in this photographic film cartridge, the leading end of the film has a stronger curl than in the conventional case.

When the above-mentioned conventional camera feeds a film with a strong curl, the leading edge of the film 40 curls downwards along the inner wall of the film take-up chamber 41 on the exposure frame side, as shown in FIG. Moving. Therefore, film 3
The problem arises that the leading end of the film cannot be engaged with the take-up shaft 42, making it impossible to load the film. SUMMARY OF THE INVENTION An object of the present invention is to provide a camera in which the leading end of the film can be engaged with a take-up shaft and the film can be loaded reliably.

[0005]

[Means for Solving the Problems] In order to achieve the above object, in the present invention, a supporting piece is formed on the exposure frame side of the camera or on the inner wall of the exposure frame side of the film winding chamber, and its tip is directly above the winding shaft. It protrudes up to a maximum of 5 mm from the exposure frame side.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a camera according to the present invention and a photographic film cartridge loaded into the camera. This photographic film cartridge 2 includes a film 3 shown by a chain double-dashed line in the figure, a spool 4 around which the film 3 is wound in a roll, and a cartridge body 5 that stores the film 3 in a light-tight manner.
It consists of. Well-known perforations 6 are formed along the longitudinal direction at both ends of the film 3. The cartridge body 4 also includes a pair of resin casings 5a, 5.
It is formed by b. Even when this photographic film cartridge 2 is not in use, the leading end of the film 3 is wound into the cartridge main body 5 as shown in FIG.

In FIG. 2 showing the inside of the photographic film cartridge described above, the spool 4 is composed of a spool shaft 4a and a pair of flanges 4b, and the flanges 4b are formed at both ends of the spool shaft 4a. Further, ribs 7a and 7b are formed on the inner side wall of the cartridge main body 5, and the ribs 7a and 7b abut against the flange 4b and press it inward. As a result, the flange 4b
pinches both ends of the film 3 to prevent the film roll 3a from loosening. Furthermore, a pair of ring-shaped inner peripheral ribs 8a and 8b are formed on the inner periphery of the cartridge main body 5. As shown in FIG. 3, the inner circumferential ribs 8a, 8b abut against the outermost circumferential surface of the unwound film roll 3a, and prevent the winding diameter of the film roll 3a from becoming larger than the diameter of the flange 4b.

As shown in FIG. 3, a tip separation claw 9 is formed on the inner circumferential ribs 8a, 8b. The film contacts the tip, peels off the film from the outermost circumferential surface, and sends it out of the cartridge main body 5 through the film delivery port 11 formed in the port portion 10. In the photographic film cartridge 2 configured as described above, when the spool 4 is rotated in the feeding direction, the film roll 3a is rotated in the feeding direction. The leading edge of the film 3 comes into contact with the leading edge separation claw 9 and is peeled off from the outermost peripheral surface, and then passes through the film delivery port 11.
sent in the direction. As shown in FIG. 2, the leading end of the film 3 is sent out from the cartridge body 5 through the film delivery port 11. In this way, the beginning of the film 3 is located.

As shown in FIG. 1, an exposure frame 17 having an exposure opening 16 is provided in the center of the camera body 15 with the back cover 14 open. A photographing lens 18 provided below the exposure frame 17 can be viewed through this opening 16. The optical axis 18a of this photographic lens 18 is indicated by a chain line in the figure. A cartridge chamber 19 into which the photographic film cartridge 2 is loaded and a winding chamber 20 which winds the film 3 sent out from inside the cartridge main body 5 are formed at both ends of the camera body 15 so as to sandwich the exposure frame 17 therebetween. ing. A pair of film rails 21 and 22 are provided in the exposure frame 17 between the cartridge chamber 19 and the take-up chamber 20 so as to sandwich the opening 16 therebetween. Further, the exposure frame 17 is provided with a reflection type photosensor 23, which detects the perforations 6 and detects the feeding amount of the film 3.

A winding shaft 26 for winding the film 3 is provided at the center of the winding chamber 20 and is driven by a motor (not shown). The outer periphery of the winding shaft 26 has a plurality of locking claws 2 that engage with the perforations 6 so that the film 3 can be easily wound when the photographic film cartridge 2 is loaded.
7 is formed. Moreover, the frontage of this winding chamber 20 is
It is narrowed by a film support piece 28 formed on the exposure frame 17, as shown in FIG. This film support piece 28 has its tip parallel to the optical axis 18a and the winding axis 2
It protrudes so that the distance D between it and the straight line L that intersects the axis of No. 6 is 5 mm. In this embodiment, the distance D is 5 mm, but it may be as long as it is 5 mm or less. Note that if the film support piece 28 is lengthened so that its tip exceeds the straight line L,
The distance D may be 5 mm or more. Therefore, the leading end of the film 3 sliding on the film rails 21 and 22 does not get between the inner wall of the winding chamber 20 on the exposure frame 17 side and the winding shaft 26. Further, in this embodiment, the film supporting piece 28 is integrally formed with the exposure frame 17 on the winding chamber 20 side, but as shown in FIG.
A film-like tongue piece 29 may be attached to 7 to support the film 3. Furthermore, in the above description, the film supporting piece 28 is formed or attached to the exposure frame 17, but it may be provided on the inner wall of the winding chamber 20 on the side of the exposure frame 17.

A cartridge loading port 30 is formed on the lower side of the camera body 15, and the photographic film cartridge 2 is loaded into the cartridge chamber 19 through the cartridge loading port 30. A fork 31 that engages with the spool 4 is formed on the back side of the patrone chamber 19. A protrusion 32 is formed on the inner wall of the cartridge chamber 19 to abut below the port section 10 and position the cartridge main body 5. The fork 31 is rotated in both directions by the aforementioned motor, and feeds and winds in the film 3. A cartridge detection switch 33 for detecting the photographic film cartridge 2 is provided near the fork 31.

The back cover 14 is provided with a well-known pressure plate 35 and a film presser 36 for pressing the fed film 3 against the take-up shaft 26. Further, a bottom cover 37 is attached to the back cover 14 to shield the cartridge loading opening 30 from light. This opening/closing of the back cover 14 is detected by a back cover switch 38 provided near the cartridge chamber 19. A release button 39 is provided at the top of the camera body 15, and each time a photograph is completed by operating the release button 39, the film 3 is automatically moved to the take-up shaft 2.
It is rolled up by 6.

The operation of the camera of the present invention constructed as described above will be explained. When the photographic film cartridge 2 is inserted into the cartridge chamber 19 and the back cover 14 is closed, the lower side of the port section 10 comes into contact with the protrusion 32. As a result, in the cartridge body 5, the film feed port 11 is connected to the film rail 21.
, 22 in the cartridge chamber 19. Furthermore, when the cartridge detection switch 33 and the back cover switch 38 are turned on, the fork 31 and the winding shaft 26 rotate in the winding direction, respectively. When the fork 31 rotates in the winding direction, the spool 4 is rotated in the feeding direction, and the leading end of the film 3 is fed out from the film feeding port 11. When the film 3 is further fed out, its leading end slides on the film rails 21 and 22 formed on the exposure frame 17 and the film support piece 28, and reaches the take-up chamber 2.
sent to 0. Incidentally, since the pressure plate 35 and the film presser 36 are opposed to each other above the film rails 21 and 22, curling of the leading end of the film 3 is corrected. Therefore, the film 3 will not get jammed during the slide.

When the leading edge of the film 3 is fed into the winding chamber 20, it curls downward due to the winding curl, but at this time, the leading edge reaches the outer peripheral surface of the rotating winding shaft 26, which is downward to the right. There is. Thereafter, the film 3 is pressed against the take-up shaft 26 by the film presser 36, and the locking claws 27 are fitted into the perforations 6. As a result, the film 3 is reliably wound around the take-up shaft 26, and the film 3 is securely wound around the take-up shaft 26.
The film is wound until the frame is set.

When the release button 39 is pressed to take a picture, the take-up shaft 26 rotates again, the film 3 is wound up, and the second frame is set in the opening 16. In this way, the photographing is repeated until the prescribed photographing is completed, and the winding shaft 2
When the load on the winding shaft 6 increases, a clutch (not shown) is activated, and the winding shaft 26 becomes free and stops rotating. Thereafter, when the fork 31 is rotated in the unwinding direction, the spool 4 is rotated in the winding direction. This rotation causes
The film 3 wound around the take-up shaft 26 is wound into the cartridge main body 5 up to its tip. Thereafter, the back cover 14 of the photographic film cartridge 2 is opened and taken out.

The present invention has been described above with respect to a type of camera in which a photographic film cartridge is loaded by exposing the cartridge chamber and take-up chamber by opening the back cover when loading the film. The camera disclosed in the publication, for example, exposes only the patrone room,
The present invention can also be applied to a camera loaded with a photographic film cartridge.

[0017]

As described above in detail, in the camera of the present invention, a support piece is formed on the exposure frame or the inner wall of the exposure frame side of the film take-up chamber, and the tip thereof is placed at a distance of up to 5 mm from directly above the take-up shaft. Since the film protrudes to a position closer to the exposure frame side, even if the film has a strong winding curl at the leading end, it can be engaged with the take-up shaft, so that the film can be loaded reliably.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a camera of the present invention and a photographic film cartridge loaded into the camera.

FIG. 2 is a cross-sectional view of the photographic film cartridge shown in FIG. 1 taken along the spool.

3 is an internal sectional view of the photographic film cartridge shown in FIG. 1. FIG.

FIG. 4 is a sectional view showing essential parts of the camera of the present invention.

FIG. 5 is a sectional view showing essential parts of another embodiment of the present invention.

FIG. 6 is a sectional view showing a conventional film winding chamber.

[Explanation of symbols]

2 Photo film patrone 3 Film 4 Spool 15 Camera body 17 Exposure frame 19 Patrone room 20 Winding room

Claims (1)

[Claims] Claims: 1. An exposure frame having an exposure aperture defining the photographing range of the photographic lens; a cartridge chamber formed at both ends of the exposure frame to sandwich the photographic film cartridge; In the camera, a support piece for supporting the film is formed on the inner wall of the exposure frame or the film take-up chamber on the exposure frame side, and its tip is connected to the film winding chamber. A camera characterized by protruding from directly above the take-up shaft to a position closer to the exposure frame side by a maximum of 5 mm.