JPH04177338A - Picture film patrone - Google Patents

Abstract

PURPOSE:To effectively transmit the rotational power of a spool at the time of rotation thereof also to the end part of a film by forming a rear end regulating part for regulating the receding of the film rear end, on the spool. CONSTITUTION:A rear end regulating part 22 for regulating the receding of a film rear end part 15a, by being abutted on the end of the film rear end part, at the time of the rotation of a spool 14 in the direction of feeding a film 15, is formed on the spool 14. When the spool 14 is rotated so as to feed the film 15, the film rear end part 15a is pushed back in the receding direction due to the load added to the film at the time of feeding, however, since the movement of the film rear end part 15a is regulated by the rear end regulating part 22 provided on the spool 14, the end by which the width of the rear end part 15a is narrowed, is not strongly pressed to the axis part of the spool 14, and a crack is not generated on that part. Even when some load is added, film feeding can be stably carried out.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a photographic film cartridge in which film is fed out of the cartridge body by rotation of a spool.

[Conventional technology]

Recently, U.S. Patent Nos. 4,832,275 and 483,430
No. 6 and others have proposed a photographic film cartridge in which the film is fed out of the cartridge body by rotating a spool in one direction. In this photographic film cartridge, when it is not in use, the leading end of the film is also rolled up inside the cartridge body. The film roll wound around the spool is prevented from loosening by a pair of rings rotatably built into the main body of the cartridge, or by an annular tongue protruding inward from the outer periphery of the spool flange. Therefore, when the spool is rotated in one direction, the rotation is directly transmitted to the film roll. During the process of rotating the film roll along with the spool, a separating claw provided at the back of the film boat scoops the leading edge of the film out of the film roll. is sent out through the outlet. By the way, the spool used in conventional photographic film cartridges for 135 film locks the rear end of the film wound around it, and even if the film is pulled out from the cartridge body all at once, the film does not come off the spool. It is designed not to. FIG. 8 shows such a conventional spool. The spool 2 is formed by integrally molding a shaft portion 3 and a pair of flanges 4, and the shaft portion 3 is formed with a slit 6 into which the rear end portion 5a of the film 5 is inserted. Inside the slit 6, a pair of locking claws 7.7 and a pull-out prevention protrusion 8 are provided, and when the rear end portion 5a of the film is inserted into the slit 6, it engages with the pair of holes 5b as shown in FIG. The retaining claw 7 enters and the retaining protrusion 8 presses the rear end portion 5a of the film to prevent the film from being withdrawn.

[The problem that the invention tries to solve! ! ! ! ] When the film is fed out by rotating the spool, as in the photographic film cartridge described in the above US patent, when the leading edge of the film passes through the film outlet, it must pass between the light-shielding telescopes affixed to that part. A large load is applied as it passes through. The load thus generated is transmitted through the film roll to the engagement portion between the rear end of the film and the spool. However, the conventional spool 2 as shown in FIG.
Although the structure of the shaft portion 3 has a function of locking the rear end of the film so that it does not come out, it does not have a structure that can reliably transmit the rotation of the spool 2 to the film 5. That is, the spool 2 is moved in the film feeding direction (
Even if it is rotated as shown by arrow F in Fig. 10,
Since the front side of the locking claw 7 has a tapered surface and the hole 5b is larger than the locking claw 7, when the load applied to the film leading end is transmitted to the film rear end 5a, the film rear end 5a is now pushed back. Then, the shoulder portion 5C (FIG. 9) on the rear end side of the film comes into contact with the shaft portion 3, and the spool 2 is rotated in the direction of arrow F, so that the film 5 is held at the shoulder as shown in FIG. The winding direction of the film 5 is reversed at the portion 5C, and strong pressure is applied from the contact portion with the shaft portion 3. For this reason,
Cracks S as shown by broken lines tend to form in this area, and in extreme cases, the rear end of the film may be cut off. [Object of the Invention] The present invention was made to solve the above-mentioned drawbacks, and when the spool is rotated in the film feeding direction, the rotational force can be effectively transmitted to the rear end of the film. The purpose of the present invention is to provide a photographic film cartridge with the following features.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a trailing edge regulating portion that comes into contact with the edge of the trailing edge of the film to prevent the trailing edge of the film from retreating when the spool is rotated in the film feeding direction. It was formed in

[Effect]

When the spool is rotated to feed the film, the load applied to the film during feeding pushes the trailing edge of the film back in the backward direction, but the trailing edge regulating section provided on the spool restricts the movement of the trailing edge of the film. Therefore, the edge that makes the rear end portion narrow is not pressed strongly against the shaft portion of the spool, and no cracks or the like occur in that portion. The invention will now be described with reference to the illustrated embodiments.

【Example】

In FIG. 1, the photographic film cartridge consists of a cartridge main body 13 consisting of an upper case 11 and a lower case 12, a spool 14 rotatably housed inside the cartridge main body 13, and a film 15 wound around the spool 14 in a roll shape. Consisting of The film 15 is made of, for example, 135 type photographic film, and is wound around the shaft 16 of the spool 14, and its side edges are regulated by a pair of flanges 17, 17. As shown in FIGS. 2 and 3, a slit 18 is formed in the shaft portion 16 of the spool 14, and a rear end portion 1 of the film narrowed from the side 18a is inserted into the slit 18.
5a is inserted. A regulating wall 20 is formed on the exit 18b side of the slit 1-18 to receive and stop the terminal edge of the rear end portion 15a of the film and to regulate its movement. A locking pawl 2I is provided in the slit 18 to fit into a pair of holes 15b formed in the rear end portion 15a of the film, and the rear end portion 15a of the film is held so that the locking pawl 21 does not come out from the hole 15b. A stop protrusion 22 is provided to prevent removal. Since the length of the narrowed rear end portion 15a of the film is longer than the diameter of the shaft portion 16, when the hole 15b is locked with the locking claw 21 as shown in FIG. An edge 15c for narrowing the rear end portion 15a of the film is spaced apart from the shaft portion 16. Ring-shaped ribs 24.25 are integrally formed on the inner walls of the upper and lower cases 11.12, and abut against the outermost peripheral surface of the roll-shaped film 15 to prevent the film from becoming loose. Further, boat parts 28 and 29 are formed in the upper and lower cases 11 and 12 to form a film discharge passage and a film discharge port 26, and from the film discharge port 26 to the cartridge main body 13.
There is a telescope 30 for light shielding in the film path leading to the inside of the
is provided. A tip separation claw 32 is integrally formed at the back of the port portion 29 of the lower case 12. The tip separation claw 32 functions to scoop up the tip portion 15d of the film 15 from the surface of the film roll below it. Further, the tip portion 15d of the film 15 has a shape that protrudes the most at the portion facing the tip separation claw 32. The operation of the photographic film cartridge described above will be explained. In this photographic film cartridge, in an unused state, the film 15 is completely rolled up into the cartridge main body 13, including its leading end 15d. When the spool 14 is rotated in the film feeding direction (clockwise in Fig. 1), the rib 2
4 and 25, the rolled film 15 rotates together with the spool 14. During this rotation, the leading end 15d of the film 15 is scooped up by the leading end separating claw 32, and as the spool 14 continues to rotate, the leading end 15d is sent out toward the film discharge port 26. When the film leading end 15d reaches the telescope 30, the film feeding load increases, and this load is applied to the film trailing end 1.
It is transmitted to 5a. As a result, the rear end portion 15a of the film is
As shown in the figure, it tries to retreat downwards, but its retreat is restricted by the restriction wall 2.
0 prevents the end edge 15c from coming into contact with the shaft portion 16 of the spool 14. Therefore, when the spool 14 is further rotated against the above-mentioned load, the terminal edge of the film 15 is firmly held by the regulating wall 20, and the rotational force of the spool 14 can be transmitted to the film 15. The leading end portion 15d of the film can be sent out from the film discharge port 26 against this. Furthermore, as shown in FIG.
Even if it is reversed on the side, one of the greens forming the entrance 18a is pressed entirely against the rear end portion 15a of the film.
There are no cracks in this part. 4 and 5 show other spools for use in the present invention. The shaft portion 36 of the spool 35 has a slit 3 into which the rear end portion 37a of the film 37 is inserted.
8 is formed. Inside this slit 38, a locking pawl 21. A removal stop protrusion 22 is provided to lock the hole 37b in the rear end portion 37a of the film. The length of the rear end portion 37a of the film is shortened, and the edge 37c for narrowing the rear end portion 37a of the film is formed by the shaft portion 36.
It's inside. The slit 38 has an entrance 38a wide enough to receive the regular width of the film 37, and an exit 38b wide enough to accommodate the rear end 37a of the film. and,
A regulating wall 40 is provided approximately at the center of the slit 38. This regulating wall 40 restricts the downward movement of the edge 37c in the figure, and applies a force in the feeding direction to the film 37 via the edge 37c. According to the spool 35 configured in this way, when a force is applied to the film 37 in the backward direction during feeding of the film, the edge 37c is inside the slit 38, so that the film is not affected at this portion. Since the reversing force does not work easily and the film is held entirely in the width direction, uneven pressing force is not applied to the edge 37C.
Similar to the previous embodiment, there is no possibility that the edge 37c will be cracked. FIGS. 6 and 7 show still other examples of spools used in the present invention. A slit 49 is formed in the shaft portion 46 of the spool 45 into which the rear end portion 48a of the film 48 is inserted. In the slit 49, a locking claw 21 and a removal prevention protrusion 22 are provided as in the previous embodiment.
The hole 48b in the rear end portion 48a of the film is locked. Note that this film 48 has the same top width up to the rear end 48a. The slit 49 has the same width as the film 48 at the entrance 49a, but at the exit 49b there is a regulating wall 5 from both sides.
0 stands out. The regulating wall 50 is located at the rear end portion 48a of the film.
The rear end portion 48a of the film is prevented from moving downward in the figure by coming into contact with the edge of the rear end portion 48a, and a force in the feeding direction is applied to the film 48 via the rear end portion 48a. According to this spool 45, when a force is applied to the film 48 in the backward direction when feeding the film,
Since the edge of the rear end portion 48a of the film is held as a whole,
No uneven pressing force is applied to the rear end portion 48a, and no cracks occur at the edge of the rear end portion 48a, as in the previous embodiment.

【Effect of the invention】

As described above, in the photographic film cartridge of the present invention, a regulating part is formed on the shaft of the spool to regulate the movement of the trailing edge of the film, and when the spool is rotated in the film feeding direction, Since the trailing edge of the film is prevented from moving in the backward direction, the edge for narrowing the trailing edge of the film may locally come into contact with the shaft of the spool, causing cracks, etc. Even if some load is applied to the leading edge of the film when it passes between the telescopes, the film can be fed out stably.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a photographic film cartridge using the present invention. FIG. 2 is a longitudinal sectional view of the spool shown in FIG. 1. FIG. 3 is a cross-sectional view of the spool shown in FIG. 1 taken along line X--X. FIG. 4 is a longitudinal sectional view showing another example of the spool used in the present invention. FIG. 5 is a cross-sectional view of the spool shown in FIG. 4 taken along line Y-Y. FIG. 6 is a longitudinal sectional view showing still another example of the spool used in the present invention. FIG. 7 is a cross-sectional view of the spool shown in FIG. 6 taken along the z-X line. FIG. 8 is a perspective view showing a conventional spool. FIG. 9 is a longitudinal sectional view of the spool shown in FIG. 8. FIG. 10 is a cross-sectional view of the spool shown in FIG. 8. 2.14, 35.45...Spool 3.16, 36.46...Shaft 5.15, 37.48...Film 5a, 15a, 37a, 48a...Film rear end 6.
18.38.49...Slit 7...Latching claw 8...Removal prevention protrusion 13...Patrone body Figure 2 Figure 3 Figure 4 [" Figure 5 7a Procedural amendment form

Claims (1)

[Claims] (1) In a photographic film cartridge where the leading edge of the film is fed out of the cartridge body by rotating the spool, when the spool is rotated in the film feeding direction, it comes into contact with the edge of the trailing edge of the film and the trailing edge of the film retreats. A photographic film cartridge, characterized in that the spool is provided with a trailing edge regulating portion for regulating the spool.