JP2801701B2 - Photo film patrone - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a patrone for a photographic film, and more particularly to an improvement in a patrone in which a film is fed by rotation of a spool.

[Conventional technology]

2. Description of the Related Art Photo film patrones currently in widespread use are such that a leading end of the film is drawn out of the patrone in advance, and the leading end portion is engaged with a feed mechanism of a camera to perform an initial feed of the film. In recent years, however, there has been proposed a type in which the entire film is stored in the patrone and the film is fed out by rotating a spool for reasons such as simplification of patrone loading.

In such a patrone, it is necessary to reliably transmit the rotation of the spool to the film in order to reliably feed the film. For this reason, the unevenness is formed on the side surface of the film and the spool, and these are engaged with each other (Japanese Patent Application Laid-Open No. 53-13918), and a material having cushioning and elasticity is provided on the outer periphery of the spool. hand,
Higher friction between spool and film (62-16
No. 4343) has been proposed.

Further, in order to prevent the film from being loosened, two rings are arranged around both ends of the film wound around the spool (US Pat. No. 4,832,275), and a rib formed on the flange of the spool (US Pat. 4834306,4848693
And the spool is composed of two parts that can slide in the axial direction, and the film is sandwiched between the flanges of these two spools (US Pat. No. 4,846,418).

[Problems to be solved by the invention]

However, when uneven portions are formed on the side surface of the film and the spool, there is a problem that the shapes of the film and the spool become complicated, and the production cost increases.

In other cases, loosening of the outer periphery of the film is prevented.However, a space is formed near the core of the spool due to loosening, and the film is reversed in the space and bent, and the rotational force of the spool is not transmitted to the film. However, there is a disadvantage that the film cannot be sent out.

[Object of the invention]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a photographic film cartridge capable of reliably transmitting the rotational force of a spool to a film with a simple configuration.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a flip-up section which contacts the innermost circumference of the wound film on the spool, and interlocks with the rotation of the spool in the feeding direction, so that the flip-up section is By pressing the innermost periphery of the film outward, the entire film is pressed outward.

[Action]

According to the present invention configured as described above, when the spool is rotated in the film feeding direction, the film is pressed outward by the flip-up portion, so that the films wound in multiple layers come into close contact with each other. The rigidity is increased, and the feeding force of the spool is reliably transmitted to the entire film.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 shows the configuration of the patrone according to the present embodiment. This patrone 10 has a patrone body 12,
It comprises a spool 16 around which the photo film 14 is wound, and two side plates 18 and 20 for sealing the patrone body 12.

The patrone body 12 is formed in a cylindrical shape, and a port portion 21 serving as an entrance and exit of the film 14 is formed in a part of the outer periphery. Further, a light-shielding telem 22 is provided on an inner surface of the port portion 21.

The photo film 14 is a 35 mm film, one end of which is locked to the spool 16, and the entirety of the photo film 14 up to the leader portion 14a at the other end is housed in the cartridge body 12.

The spool 16 has flanges 24, 25 formed at both ends of a core 26, and rotates in both forward and reverse directions to feed and wind the film 14.

The side plates 18 and 20 are formed with bearing openings 18a and 20a through which the spool core 26 is rotatably inserted.

FIG. 1 shows the configuration of the spool 16 according to the embodiment, and FIG. 3 shows the internal configuration of the cartridge 10. In the drawing, two pressing members 28 and 30 are provided at both ends of the core 26 of the spool 16 so as to be rotatable, respectively.

The pressing members 28 and 30 are, as shown in FIG.
Cut off a part of the thick cylindrical bases 32, 34 and flip up the part 32
a, 32a are formed. Then, the flip-up portions 32a, 3
4a is a projection 26a formed on a part of the outer periphery of the core 26 when the spool 16 is rotated in the film feeding direction (clockwise).
Can be jumped up. The outer peripheral surfaces of the pressing members 28 and 30 are treated so that the film 14 does not slip by increasing the coefficient of friction.

Also, a rib 40 is provided inside the patrone main body 12, so that the friction between the outer periphery of the film 14 and the inner perimeter of the patrone main body 12 is reduced, so that the film 14 can be smoothly fed.

With the above configuration, when the spool 16 rotates in the film feeding direction (clockwise), the flip-up portions 32a and 34a in the initial state as shown in FIG. Is pushed upward by the projection 26a. These flip-up portions 32a and 34a press the inside of the innermost circumference of the roll of the film 14 wound around the spool 16 outward, so that the entire roll of the film 14 is pressed outward. As a result, the film 14 wound on the spool 16
Adhere to each other, and the rigidity of the film 14 is increased. Accordingly, the rotational force of the spool 16 is reliably transmitted to the film 14, and the film 14 is reliably sent out from the port 21 of the cartridge 10.

〔The invention's effect〕

As described above, according to the present invention, the spool is provided with a flip-up section which comes into contact with the innermost circumference of the wound film, and the flip-up section is linked to the rotation of the spool in the film feeding direction. Because the film is pressed outward by pressing the innermost periphery outward,
There is an effect that the rotational force of the spool can be reliably transmitted to the film with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a perspective view (partial cross section) showing a configuration of a patrone according to an embodiment. FIG. 2 is a perspective view showing the configuration of the patrone according to the embodiment. FIG. 3A is a cross-sectional view showing an internal configuration of the patrone in an initial state. FIG. 3B is a cross-sectional view showing an internal configuration of the cartridge in a spool driving state. 10 ... Patrone 14 ... Photo film 14a ... Film leader 16 ... Spool 26 ... Core 28,30 ... Pressing members 32a, 34a ...

Claims (1)

(57) [Claims] 1. A photographic film cartridge in which one end is locked to a spool and the leading end of a film wound and stored on the spool is sent out to the outside by rotation of the spool. A flip-up portion that contacts the periphery is provided on the spool, and in conjunction with the rotation of the spool in the film feeding direction, the flip-up portion presses the innermost circumference of the film outward, thereby pressing the entire film outward. Photo film patrone characterized by doing.