JPH10301238A - Spool for brownie film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spool capable of surely locking a light shielding paper to a spool shaft with weak force. SOLUTION: A slit 14 is formed on the spool shaft 11 in a shaft direction. A catch 15 is integrally elastically provided to face oppositely to one inside wall 14a of the slit 14 in a vertical direction on the shaft 11 on one aperture 17 side of the slit 14. A gap (b) between the catch 15 and the wall 14a is smaller than the thickness of the paper 2. When the leading end part 5 of the paper 2 is inserted in the slit 14, the catch 15 is deformed to allow the insertion, so that the part 5 can be inserted with the weak force. The locking of the part 5 is performed only by pressing the part 5 against the wall 14a by the repulsive force of the catch 15, so that the part 5 can be easily withdrawn from the slit 14 in the case of being pulled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brownie film spool for winding a brownie film in a roll.

[0002]

2. Description of the Related Art A brownie film mainly used for a medium format camera is constituted by providing a light-shielding paper at least at both ends of a film strip having a width of 6 cm, and is wound around a spool shaft of a spool to form a roll. Have been. There are two types of brownie films, 120 type and 220 type. A 120-type brownie film is provided with light-shielding paper longer than the film strip so as to cover the entire base surface of the film strip. The 220 type brownie film is configured by providing light-shielding paper only at both ends of the film strip,
Compared to the 120 type, the number of frames that can be shot using a long film strip is increased because the light-shielding paper is omitted.

[0003] Spools for brownie films are ISO
732-1982, ANSI PHI 21-198
0, standardized by JIS K7512-1985 and the like. A slit is formed in the spool along the axial direction of the spool shaft. At both ends of the spool shaft, a pair of flanges for regulating both end surfaces of the light-shielding paper and covering both end surfaces of the film strip to shield light are formed.

In manufacturing a brownie film, the rear end of the light-shielding paper is inserted into a slit of a spool shaft, and then the spool is rotated and wound around the spool shaft in a roll form.

When setting a brownie film on a medium format camera, the back cover is opened and an empty spool is set in a film winding chamber of the medium format camera for winding.
Next, the new brownie film is set in the film loading chamber so as not to be loosened. Then, after inserting the leading end of the light-shielding paper into the slit of the take-up spool, the take-up spool is rotated. The back cover is closed after the leading end side of the light-shielding paper is wound around the spool shaft several times and the leading end portion is locked on the spool shaft.

[0006] The take-up lever is operated every time a photograph is taken, and the photographed film strip is taken up on the take-up spool. By continuing the winding operation even after all the photographing is completed, the rear end of the light-shielding paper comes out of the slit.

In the above-mentioned brownie film, the slits are made thicker than the thickness of the light-shielding paper so that the winding operation after the completion of the entire photographing operation allows the rear end of the light-shielding paper to be wound around the spool shaft. The rear end side of the paper is made to easily come out of the slit. Therefore,
When the film is loaded, the leading end side of the light-shielding paper slips and easily slips out of the slit, and it takes time and effort to securely lock the leading end side. Therefore, various inventions have been proposed in which a protrusion is provided on one inner wall in the vertical direction of the slit, and when the light-shielding paper is inserted into the slit, the light-shielding paper is interposed and locked between the protrusion and the other inner wall.

[0008]

However, in the above-described configuration, the gap between the projection and the inner wall is made smaller than the thickness of the light-shielding paper in order to sandwich the light-shielding paper between the protrusion and the inner wall. In some cases, the tip of the light-shielding paper hit the projection and was bent. Further, a strong force is required to insert the light-shielding paper, and the locking is troublesome.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a spool for a brownie film capable of securely locking a light-shielding paper to a spool shaft with a small force. It is assumed that.

[0010]

In order to achieve the above object, according to the first aspect of the present invention, a slit for inserting a light-shielding paper into a spool shaft provided with a pair of flanges for regulating both ends of a brownie film is provided. A locking claw that presses and locks the light-shielding paper inserted into the slit against the inner wall in the vertical direction of the slit and is elastically integrally formed with the spool shaft, and the light-shielding paper is formed on the slit. When inserted, the locking claw is elastically deformed and its insertion is allowed. In the invention according to claim 2, the gap between the locking claw and the inner wall is formed to be less than the thickness of the light shielding paper. According to the third aspect of the present invention, a concave portion is provided on a part of the inner wall so as to face the locking claw, so that when the light shielding paper is inserted into the slit, a part of the light shielding paper pressed by the locking claw can enter. It was done.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 3, a brownie film 1 of a 120 type comprises a film strip 3 and
The light-shielding paper 2 is longer than the film strip 3 provided to cover the entire base surface. In order to make it easy to understand the positional relationship between the light-shielding paper 2, the film strip 3, and the adhesive tape 4, the film strip 3 and the adhesive tape 4 are indicated by a dashed line and a two-dot chain line, respectively. Shading paper 2
In the front end 5 and the rear end 6, the edges of both sides are narrowed in a tapered shape, and the width is narrower toward the end. The brownie film 1 is configured by being wound in a roll around a spool shaft 11 of a spool 10 shown in FIG.

A spool 10 shown in FIG. 1 comprises a cylindrical spool shaft 11 and a pair of flanges 12 formed at both ends thereof. The flange 12 regulates both end faces of the light-shielding paper 2 and also controls the film strip 3.
From both ends to shield light. Each flange 12 is formed with a key groove 13 which is engaged with a key shaft provided in a film loading chamber or a film winding chamber of the camera.

A slit 14 for inserting the light shielding paper 2 is formed in the axial direction of the spool shaft 11. Slit 14
A resilient locking claw 15 is formed integrally with the spool shaft 11 on the opening 17 side so as to face one of the inner walls 14a in the vertical direction. The gap b between the locking claw 15 and the inner wall 14a is
Is less than the width. The locking claw 15 elastically deforms when the light-shielding paper 2 is inserted into the slit 14 to allow the light-shielding paper 2 to be inserted, and presses the light-shielding paper 2 against the inner wall 14a by a repulsive force due to the deformation, thereby forming a gap between the inner wall 14a. It locks with.

The value of the width a of the locking claw 15 is preferably 1 to 15 mm, more preferably 3 to 10 mm. The value of the gap b between the locking claw 15 and the inner wall 14a is preferably 0.03 to 0.12 mm, more preferably 0.06 to 0.12 mm.

The spool 10 is manufactured by plastic molding, and suitable materials include high impact polystyrene, polypropylene, polyethylene, and polycarbonate.

At the time of manufacture of the brownie film 1, the spool 10 is rotated after the rear end 6 of the light-shielding paper 2 is inserted between the locking claw 15 and the inner wall surface 14a through the opening 17 of the slit 14 in a dark room at the time of manufacture. Then, it is wound in a roll shape around the spool shaft 11. Rear end 6 inserted in slit 14
Is pressed against the inner wall 14a by the elasticity of the locking claw 15 and is caught and locked between the locking claw 15 and the inner wall 14a. After this winding is completed, the leading end portion 5 is slightly bent so that the winding is not loosened, and is attached with an adhesive tape.

When using the brownie film 1,
An empty spool 10 of the same shape is set in advance as a winding shaft in a film winding chamber of a medium format camera.
The rotation angle of the spool 10 is adjusted so that the distal end portion 5 is easily inserted, and the opening 18 of the slit 14 is directed toward the rear side of the medium format camera. The adhesive tape is peeled off while holding the brownie film 1 with a finger so that the brownie film 1 is not loosened. Flange 1
The second key groove 13 is engaged with the key groove provided in the film loading chamber, and the brownie film 1 is set in the film loading chamber.

The tip 5 of the light-shielding paper 2 is picked out with a finger and pulled out. The tip 5 is moved from the opening 18 of the slit 14 to the locking claw 1
5 between the inner wall 14a and the inner wall 14a. The tip of the locking claw 15 is formed in a tapered shape so that the gap with the inner wall 14a becomes wider toward the opening 18 (see FIG. 1).
Since the elastic member 5 is elastically deformed and allows the insertion, the distal end portion 5 can be easily inserted between the locking claw 15 and the inner wall 14a with a small force. The locking claw 15 presses the distal end portion 5 against the inner wall 14a by a repulsive force due to elastic deformation, and the locking claw 15 and the inner wall 14a
And lock the front end portion 5 therebetween.

Next, the distal end portion 5 protruding from the opening 17 is bent so that the locking claw 15 is hidden as shown by a dashed line. The spool 10 is rotated by operating the winding lever, and the light-shielding paper 2 is wound around the spool shaft 11 as shown by a two-dot chain line. Tip 5 inserted into slit 14
Are locked between the locking claw 15 and the inner wall 14a by the repulsive force due to the elastic deformation of the locking claw 15, so that the spool 10 does not come off when the spool 10 rotates.

The back cover is closed after the arrow printed on the outer surface of the light-shielding paper 2 is aligned with the start mark provided in the film passage. When the winding operation is further continued, the first frame is set in the aperture, the shutter is charged, and then the winding lever is locked. The shutter button is pressed down to perform a winding operation for each shooting. As a result, the film strip 3 is wound around the spool 10 of the film winding chamber one frame at a time.

The film strip 3 is wound up,
When all shooting is completed, the winding lever is continuously operated to continue the winding operation. The locking of the rear end portion 6 is merely sandwiched between the locking claw 15 and the inner wall 14, so that when the rear end portion 6 is pulled along with the winding operation, the rear end portion 6 is easily pulled out of the slit 14 and spooled. It is wound around the shaft 11.

Then, open the back cover of the camera and hold down the rear end 6 from above so as not to loosen the spool.
The brownie film 1 wound around 1 is taken out of the film winding chamber. After attaching the attached adhesive tape to the rear end portion 6 so as to prevent winding and loosening, the photographed brownie film 1 is submitted to a developing dealer.

In FIG. 2 showing a spool having a shape different from that shown in FIG. 1, two resilient locking claws 26 and 27 are arranged side by side on the spool 25 so as to face the inner wall 29a of the slit 29. Has been established. Concave portions 32 and 33 are provided on the inner wall 29 a so as to face the locking claws 26 and 27, respectively.
6, 27 and the inner wall 29a. The value of the distance c connecting the central portions of the locking claws 26 and 27 is preferably 1 to 15 mm, more preferably 3 to 10 mm. The value of the gap d between the inner wall 29a of the slit 29 and the locking claws 26, 27 is preferably 0 to 0.12 mm,
0.1 mm is more preferable.

In the above-described configuration, for example, when the tip 5 is inserted into the slit 29, the tip 5 is
7 presses against the inner wall 29a and is locked. The portion of the tip 5 pressed by the locking claws 26, 27 is
Since they do not enter the inner walls 29 and 33 and abut against the inner wall 29a, the insertion resistance is low. Therefore, the distal end portion 5 can be inserted with a smaller force than that shown in FIG. Further, even when the locking claws 26, 27 have entered the recesses 32, 33 due to molding errors, the tip 5 can be inserted. The same effect can be obtained when the rear end 6 is inserted.

In the above, the number of locking claws is one or two.
It is not limited to one. The present invention provides a 220-type brownie in which the number of frames that can be photographed using a long film strip is increased by providing light-shielding paper only at the leading end and the rear end of the film strip and omitting the light-shielding paper as compared with the 120 type. It can also be used for film spools.

[0026]

As described above, according to the spool for a brownie film of the present invention, a slit for inserting a light-shielding paper is formed on a spool shaft provided with a pair of flanges for regulating both ends of the brownie film. When the light-shielding paper inserted into the slit is pressed against the inner wall and locked to the inner wall in the vertical direction of the slit, the locking claw is elastically formed integrally with the spool shaft, and when the light-shielding paper is inserted into the slit. Since the locking claw is elastically deformed and its insertion is permitted, the insertion resistance of the light-shielding paper is small and the locking claw can be easily locked with a weak force. A recess is provided in a part of the inner wall so as to face the locking claw, so that when the light shielding paper is inserted into the slit, a part of the light shielding paper pressed by the locking claw can enter. The light-shielding paper can be locked with a smaller force since the light-shielding paper is not caught between the locking claw and the locking claw.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a brownie film spool of the present invention.

FIG. 2 is an explanatory view of another brownie film spool.

FIG. 3 shows a 120-type brownie film in which the entire base surface of a film strip is covered with light-shielding paper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Brownie film 2 Shielding paper 10 Spool 11 Spool shaft 14 Slit 14a Inner wall 15 Locking claw

Claims (3)

[Claims] 1. A brownie spool for winding a brownie film having light-shielding paper provided on at least both ends of a film strip. A locking claw is formed on the spool shaft to elastically and flexibly engage a light-shielding paper inserted into the slit against the inner wall in opposition to one of the inner walls in the vertical direction of the slit. A locking claw is elastically deformed when the slit is inserted into the slit, so that the insertion is permitted. A spool for a brownie film. 2. The spool for a brownie film according to claim 1, wherein a gap between the locking claw and the inner wall is formed to be less than a thickness of the light shielding paper. 3. A part of the inner wall is provided with a concave portion facing the locking claw, so that when the light shielding paper is inserted into the slit, a part of the light shielding paper pressed by the locking claw can enter. The spool for a brownie film according to claim 1, wherein: