JPH0617994B2 - Photo film spool - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic film spool for winding a photographic film, and more particularly to a structure for locking a photographic film base end.

[Conventional technology]

The photographic film spool for winding the photographic film is preferably such that the photographic film can be easily fixed to the winding shaft of the spool and that once it is fixed, the photographic film is not easily displaced from the winding shaft. Conventionally, various methods for fixing a photographic film of such a photographic film spool to a winding shaft have been developed, and for example, there are photographic film spools as shown in FIGS. 5 to 8. Japanese Patent Publication No. 44-10830 discloses an example of such a spool.

FIG. 5 is a front view of a spool for photographic film, FIG. 6 is a sectional view taken along the line AA in FIG. 5, FIG. 7 is a partially cutaway plan view of the same as above, and FIG. It is a front view which shows the state in the middle.

In FIG. 5, reference numeral 1 is a winding shaft, around which the photographic film 2 is wound. Flange 3,3 is provided near both ends of this reel 1 with a space slightly longer than the width of the photographic film 2.
Are formed. Also, the winding shaft 1 between the flanges 3, 3
An insertion hole 4 is formed at a substantially central portion of the photographic film 2 so as to extend in a slender shape in the axial direction.
Is to be inserted.

Locking ribs 8 and 8 are formed on one inner wall 6 of the insertion hole 4 at the same intervals as the perforations 7 and 7 formed on the base end portion 5, and on the other inner wall 9 of the other inner wall 9. A slip-off preventing rib 10 is formed substantially in the middle of the locking ribs 8, 8. As shown in FIG. 6, the locking rib 8 has a slanted portion 1 which gradually approaches the other inner wall 9 in the inserting direction B of the photographic film 2.
1 is formed, and claws 12, 12 that project from the apex of the inclined portion 11 in the insertion direction B of the photographic film 2 and that are locked by the perforations 7 are formed. The slip-out prevention rib 10
Is formed with an inclined portion 13 that gradually approaches the inner wall 6 in the insertion direction B of the photographic film 2.
From the terminal end of 3, a holding portion 14 is formed which is substantially parallel to the inner walls 6 and 9.

To fix the photographic film on the photographic film spool as described above, the base end portion 5 of the photographic film 2 is inserted into the insertion hole 4. Then, the base end portion 5 is guided by the inclined portion 11 or 13 and is further inserted while being deformed by the claws 12 and the holding portion 14 as shown in FIG. 8, and is inserted into the perforation 7 formed in the base end portion 5. The moment the nail 12 is inserted, the restoring force of the photographic film 2 restores the deformation, and the state shown in FIGS. 6 and 7 is obtained. Then, at this time, since the perforation 7 is locked to the claw 12 in a state in which the pressing portion 14 regulates the movement of the base end portion 5, the photographic film 2 is securely fixed to the photographic film spool.

[Problems to be solved by the invention]

As described above, it is the locking ribs and the slip-out prevention ribs that fix the photographic film to the spool.The locking ribs regulate the movement of the photographic film in the insertion direction. Is for controlling the movement in the direction perpendicular to and maintaining the state in which the perforation is locked to the claw. Therefore, in order to completely prevent the perforations from coming off from the nails by the slip-out prevention ribs, both ends of the slip-out prevention ribs should be brought as close as possible to the locking ribs on both sides, and the position of the holding portion should be set to the position of the photographic film. I had to make a good match.

Therefore, since the conventional slip-out preventing rib has a wide width and is formed thick, it is necessary to reduce the cycle time for improving the productivity in the injection molding process which is a production means of the photographic film spool. Attempts to make the drawing resulted in sink marks at the slip-out preventing ribs due to insufficient injection time and cooling time, and the manufacturing time could not be shortened, and thus the manufacturing cost could not be reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a photographic film spool capable of reducing the manufacturing cost without causing sink marks even if the time for one cycle is shortened without changing the method of locking the photographic film. To aim.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention has two ribs for preventing slippage.
The ribs are formed as narrow as possible to prevent sink marks.

That is, the spool for photographic film of the present invention comprises a winding shaft for winding the photographic film, and a pair of flanges formed at substantially opposite ends of the winding shaft for restricting axial movement of the photographic film wound on the winding shaft. , An axially elongated film insertion hole formed in the winding shaft into which the base end portion of the photographic film is inserted, and one inner wall of the insertion hole faces the other inner wall and gradually approaches in the photographic film insertion direction. At least two locking ribs each having an inclined portion and a claw for locking a hole formed in the base end portion at the apex of the inclined portion, and the other of the inner walls are formed in the middle of the locking rib. In the spool having the detachment prevention rib, the detachment prevention rib is constituted by at least two ribs having a narrow width.

The rib for preventing slipping out of the spool for photographic film according to the present invention is composed of at least two ribs having a narrow width. This narrow width means a width that can shorten the injection time and the like without causing sink marks, and may be further narrowed as long as sufficient strength can be maintained. In addition, the position where each rib is formed is usually a position where the positions of both side end surfaces in the case of one conventional rib and the position of the outer end surface of each rib are the same, but in the present invention, it is close to the locking rib. However, since the width of the slip-out preventing rib does not become wide, it is preferable that the slip-out preventing ribs are brought as close as possible to the locking ribs in order to fix the photographic film more completely.

The inclination angle, the size, etc. of the inclined portion and the pressing portion of the slip-out preventing rib are substantially the same as those of the conventional slip-out preventing rib, and the other configurations are substantially the same as those of the conventional spool for photographic film.

[Action]

In the photographic film spool of the present invention, when the base end portion of the photographic film is inserted into the insertion hole, the base end portion is guided to substantially the center along the inclined portion of the locking rib or the slip-out preventing rib. Then, when the base end portion is further pushed in, the base end portion is pushed while deforming by pushing both side portions by the locking ribs and the substantially central portion by the disengagement prevention ribs in opposite directions. The moment the nails are inserted into the perforations, the restoring force of the photographic film restores the deformation to a flat state, and the movement of the base end in the insertion direction is restricted by the locking ribs and the movement in the right angle direction is prevented by the ribs. Regulate and secure the photographic film to prevent it from coming off easily.

Further, at the time of injection molding of the spool for photographic film, the rib for preventing slipping is narrow, so that the injection time and the cooling time are shortened without causing sink marks.

Embodiment An embodiment of the photographic film spool of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 is a front view of a photographic film spool, FIG. 2 is a front view of the same photographic film in a fixed state, FIG. 3 is a partially cutaway plan view of the same photographic film in a fixed state, and FIG. FIG. 4 is a front view showing a state in which the above photographic film is being inserted.

In FIG. 1, reference numerals 15 and 15 denote slip-off preventing ribs, and the width of the slip-off preventing rib 15 is substantially the same as that of the conventional slip-preventing rib 10.
It is formed in 1/3. The slip-out preventing ribs 15 and 15 are formed in the middle of the locking ribs 8 and 8 and the distance between the outer side surfaces thereof is substantially the same as the width of the conventional slip-out preventing rib 10. .

The slip-out preventing rib 15 has a short lateral width in a front view, and the side surfaces thereof are substantially the same as the conventional slip-out preventing rib 10 except that two ribs are formed side by side.
That is, it is the same as the conventional removal prevention rib 10 with about 1/3 of the center removed.

The other structures such as the locking rib 8 and the insertion hole 4 are substantially the same as the conventional one.

In the photographic film spool as described above, the base end portion 5 is inserted while being deformed as shown in FIG.
In the state shown in FIGS. 2 and 3, the perforation 7 is engaged with the claw 12 and the photographic film 2 is fixed to the photographic film spool.

[Advantages of the Invention] As described above, the photographic film spool of the present invention has the slip-off preventing ribs formed of two narrow ribs. Therefore, the spool can be ejected without causing sink marks in the injection molding process, which is a means for producing the spool. It is possible to shorten the time and cooling time,
Manufacturing cost can be reduced by improving productivity. Also,
By omitting the part that was a conventional product, the amount of resin material used can be reduced, and the material cost can be reduced. Therefore, a photographic film spool can be produced at low cost.

Further, the insertability and the fixability of the photographic film to the spool are good as in the conventional case.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of a photographic film spool according to the present invention, FIG. 2 is a front view of the same photographic film as fixed, and FIG. 3 is a part of the same photographic film as fixed. FIG. 4 is a cutaway plan view, and FIG. 4 is a front view showing a state in which the above photographic film is being inserted. FIG. 5 is a front view of a conventional photographic film spool, FIG.
5 is a sectional view taken along the line AA in FIG. 5, FIG. 7 is a partially cutaway plan view of the same as above, and FIG. 8 is a front view showing a state in which the above photographic film is being inserted. 1 ... Reel, 2 ... Photo film, 3 ... Flange, 4
…… Insertion hole, 5 …… Base end part, 6,9 …… Inner wall, 7 …… Drilling hole, 8 …… Locking rib, 10 …… Removal prevention rib, 11 ……
Inclined part, 12 ... claw.

Claims (1)

[Claims] 1. A winding shaft for winding a photographic film, a pair of flanges formed at substantially opposite ends of the winding shaft for restricting axial movement of the photographic film wound on the winding shaft, and the winding shaft. An axially elongated film insertion hole into which the base end portion of the photographic film is inserted, an inclined portion facing one inner wall of the insertion hole and the other inner wall, and gradually approaching in the photographic film insertion direction. At least two locking ribs each having a claw for locking a hole formed at the base end at the apex of the portion, and a slip-off preventing rib formed on the other of the inner walls and between the locking ribs. A spool for photographic film, wherein the slip-off preventing rib is constituted by at least two narrow ribs.