JPH05281668A - Production of photographic film cartridge - Google Patents

Abstract

PURPOSE:To improve production efficiency without impairing light shieldability by placing a light shielding member oh the inside wall of a film passage and pressing the front ends of an ultrasonic horn to the four corners thereof, thereby welding these corners. CONSTITUTION:A retaining tool 2 consists of a press plate 4 formed with a pair of notches 3 at its ends and a mounting plate 6 formed with a pair of long holes 5. This retaining tool 2 is mounted via the long holes 5 to a moving mechanism and is moved in arrow directions. The press plate 4 presses teremp 7 for light shielding to the inside wall of the film passage when the ultrasonic tool 2 is lowered. The end face on the lower side of the ultrasonic horn 10 is formed to a rectangular shape corresponding to the teremp 7 and projecting parts 11 are respectively provided at the four corners on the end face on the lower side. The projecting parts 11 are pressed to the four corners of the teremp 7 protruding from the press plate 4 when the ultrasonic horn 10 is lowered. The inside walls of the film passage corresponding to the projecting parts 11 are melted when ultrasonic welding is executed in this state. Then, the teremp 7 is fixed to the inside wall by one time of the ultrasonic welding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a photographic film cartridge in which a photographic film is housed in a resin cartridge body.

[0002]

2. Description of the Related Art In a photographic film cartridge in which a photographic film is housed in a cartridge body, the photographic film is put in and taken out through a film passage formed in the body. A light-blocking member that blocks outside light from entering the inside of the film passage is fixed to the inner wall of the film passage. As this light-shielding member, a flexible member such as a telempu is used. Therefore, the taking-in and taking-out is smoothly performed, and the photographic film is not scratched.

If the cartridge body is made of resin, the light shielding member can be ultrasonically welded. In this ultrasonic welding, the resin is melted by ultrasonic waves and the light shielding member is pressed and fixed to this molten portion, so it is convenient to use no adhesive, but heat and pressure are applied to the welded portion of the light shielding member. Therefore, the light shielding member may not be restored to its original shape, which causes a problem of deteriorating the light shielding property. In order to solve such a problem, the photographic film cartridge in which the central portion of the light shielding member is not welded but the side end portions are welded is disclosed in Japanese Patent Application No. 3-287709 and Japanese Patent Application No. 4-9530. Have been described. At the time of ultrasonic welding of these photographic film cartridges, a U-shaped ultrasonic horn is used for the ultrasonic welding machine, and only the both end portions are pressed without pressing the central portion of the light shielding member.

[0004]

However, since the ultrasonic horn has a shape unsuitable for pressing the light shielding member, it moves when the ultrasonic horn is pressed against the light shielding member. If ultrasonic welding is performed in this state, both end portions of the light shielding member cannot be welded. Therefore, in the above-described conventional method for manufacturing a photographic film cartridge, the fixing force of the light shielding member may not be secured, and the light shielding member may be peeled off when the photographic film is taken in and out.

The present invention has been made in view of the above circumstances, and provides a method for manufacturing a photographic film cartridge which efficiently manufactures a photographic film cartridge in which the light shielding member is strongly fixed without impairing the light shielding property of the light shielding member. The purpose is to

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the invention according to claim 1 prevents outside light from entering an inner wall of a film passage formed in a resin cartridge main body. A light blocking member is placed, and the tips of the ultrasonic horns are pressed against the four corners of the light blocking member to fix the light blocking member to the inner wall of the film passage with one ultrasonic welding. According to the second aspect of the present invention, the light shielding member placed on the inner wall of the film passage formed in the resin cartridge body is pressed by the pressing jig, and then the pressing jig is avoided.
The ultrasonic horn is pressed against the light shielding member to perform ultrasonic welding.

According to another aspect of the ultrasonic horn of the present invention, the protrusions that are pressed along the longitudinal direction of the light shielding member and the plurality of protrusions that are alternately arranged along the protrusions and are pressed against the light shielding member. It is formed from and. In the pressing jig according to the fourth aspect, the notch is formed in the pressing portion against which the light blocking member is pressed. According to a fifth aspect of the present invention, a light-shielding member is formed on a resin cartridge main body that rotatably houses a spool around which a photographic film is wound, and is supplied to an inner wall of a film passage that sends the photographic film to a rotating portion by rotation of the spool. The member is pressed by a pressing jig so as to avoid the plurality of tips, and then the ultrasonic horn is pressed against the light shielding member so as to avoid the pressing jig to perform ultrasonic welding.

[0008]

FIG. 1 shows a first embodiment of an ultrasonic horn and a holding jig of an ultrasonic welding machine used in the method for producing a photographic film cartridge of the present invention. The pressing jig 2 includes a pressing plate 4 having a pair of notches 3 formed at the ends thereof,
The mounting plate 6 is formed with a pair of elongated holes 5. The holding jig 2 is attached to a moving mechanism (not shown) through the elongated hole 5 and moved in the direction of the arrow in the figure. When the holding jig 2 is lowered, the holding plate 4 is pressed against the shaded portion of the light-blocking telemp 7 indicated by the alternate long and short dash line in the figure, and
Is pressed against the inner wall of the film passage described later.

The lower end face of the ultrasonic horn 10 is formed in a rectangular shape corresponding to the telem 7 and projections 11 are provided at the four corners of the lower end face. The ultrasonic horn 10 is moved up and down by a moving mechanism (not shown).
When the ultrasonic horn 10 is lowered, the protrusion 11
Are pressed against the four corners of the telemeter 7 protruding from the pressing plate 4. When ultrasonic welding is performed in this state, the inner wall of the film passage corresponding to the protrusion 11 melts. When the melted portion cools, the telemp 7 is fixed to the inner wall of the film passage.

In FIGS. 2 and 3 showing a photographic film cartridge manufactured by the manufacturing method of the present invention, the cartridge main body 15 comprises a pair of casings 16 and 17 formed of light-shielding plastic such as polystyrene resin. A photo film 19 wound on a spool 18 is housed inside. A step 20 is formed at each of the joints of the casings 16 and 17, and the step 20 is fitted to each other to prevent outside light from entering the inside from the joints.

On one end side of the casings 16 and 17, a pair of upper and lower U-shaped first and second port portions 2 are respectively formed.
1, 22 are formed. This first and second port section 2
1, 22 are joined to each other to form the port portion 23. Inside the port portion 23, the film passage 24 for sending the photographic film 19 out of the cartridge main body 15 is formed. The teremp 7 is ultrasonically welded to the upper and lower inner walls of the film passage 24. This telem 7 prevents outside light from entering the inside from the film passage 24.

In this teremp 7, the pile yarn 30 is hung on the base fabric 31 by V with a needle loom.
Nylon yarn of 00 denier and 48 filaments is used. As the base cloth 31, a plain weave of warp yarn of nylon having 50 denier and 30 filaments and weft yarn of nylon having 70 denier and 24 filaments is used. This Telempu 7 is Mitsui Nylon Black SGL 6% O.I.
W. After being dyed black with L, it is dried and then blocked with an emulsion containing styrene / acrylic resin and styrene / butadiene resin as main components.
You can't fall out of it.

A pair of ribs 35 and 36 are integrally formed on the inside of the cartridge main body 15.
36 is in contact with the outermost peripheral surface of the film roll 19a to prevent winding looseness. As a result, the tip of the photographic film 19 can be rotated in response to the rotation of the spool 18. A tip separation claw 37 is formed at one end of the rib 35, and the tip separation claw 37 separates the tip of the photographic film 19 from the outer peripheral surface. When the spool 18 is further rotated, the leading end of the photographic film 19 passes through the film passage 24 and is sent out of the cartridge body 15.

Referring to FIG. 4 showing the manufacturing process of the photographic film cartridge, the pedestals 41a to 41d for holding the casing 17 are arranged on the rail 40 at regular intervals. These receiving bases 41a to 41d are intermittently fed on the rail 40, respectively. Move to the position of the cradle 41b in the direction of the arrow in the figure, and insert the telemeter 7 into the casing
There is provided a telemp supply arm 42 for supplying and mounting the same. After the placement, the telemp supply arm 42 is moved to the rail 40.
When retracted from above, the pressing jig 2 descends, and the telem 7 is pressed against the casing 17.

After this, when the casing 17 is moved to the position of the receiving base 41c, the holding jig 2 is also moved to the position of the receiving base 41c with the telescope 7 being pressed. The ultrasonic horn 1 is provided at the position of the receiving base 41c.
An ultrasonic welding machine having 0 is installed so that it can be raised and lowered.
When the movement of the pedestal is stopped, the ultrasonic horn 10 descends, the protrusions 11 are pressed against the telem 7 and ultrasonic welding is performed. During this time, the telem 7 is held by the holding jig 2.
Since it is pressed by, it is securely fixed to the mounting position.

After fixing, the ultrasonic horn 10 and the pressing jig 2
When is raised, the casing 17 is moved toward the position of the receiving table 42d together with the receiving table 42c. Although the shaded portion of the telem 7 is pressed by the pressing portion 4, the pile yarn 30 returns from the fallen state to the standing state because the damage caused by heat generated during ultrasonic welding is small in this portion. Therefore, the light blocking effect of the telem 7 does not deteriorate.

An ultrasonic horn 45 having the shape shown in FIG. 5 may be used as the pressing jig 2. In this ultrasonic horn 45, instead of the four protrusions 11, a pair of protrusions 46 are formed in parallel to the short sides of the lower end face to widen the area pressed against the telem 7. By doing so, a stronger fixing force can be obtained. In the ultrasonic horn 47 shown in FIG. 6, one ridge 48 parallel to the long side of the lower end face is used.
And 5 protrusions are provided. The protrusions 48 alternate with the lower end face, the three protrusions alternate with the protrusion 11, and the two protrusions 49 alternate with the protrusion 11 in the center of the lower end face. It is arranged to be. This way,
It is possible to prevent the leading end of the photographic film 19 from entering between the telem 7 and the casing 17 when the photographic film 19 is fed. Furthermore, not only the end portion of the telem 7 but also the central portion can be welded.

The ultrasonic horn shown in FIG. 7 is a modification of the ultrasonic horn shown in FIG. This ultrasonic horn 50
Has six notches 51 formed in the ridge 48. By doing so, it is possible to reduce the area pressed against the telem 7 and protect the telem 7 from damage caused by heat. For the ultrasonic horns 47 and 50, holding jigs having the shapes shown in FIGS. 8 and 9 are used. The holding jig 55 shown in FIG. 8 has five openings 57 formed in the holding portion 56, and the holding jig 58 shown in FIG. 9 has three notches 59 formed in the holding portion 4. When the pressing jigs 55 and 58 having such a shape are used, the ultrasonic horns 47 and 5 are
In the case of 0, the protrusion 48 and the protrusions 11 and 49 are pressed against the pressed telem 7 to perform ultrasonic welding.

The ultrasonic horns 10, 45, 47, 50 were manufactured by setting the diameters of the projections 11, 49 and the tip widths of the projections 46, 48 to 0.3 mm, respectively. After mounting the ultrasonic welding machine of 40 KHz, it was operated in the energy mode of 50 Joules, and the telemp 7 was actually welded to the inner wall of the film passage 24. However, none of them resulted in practical use without impairing the light shielding property. It was possible to obtain the required fixing force. Further, in the above embodiment, the present invention has been described with respect to a photographic film cartridge in which the photographic film 19 is sent out of the cartridge body 15 by the rotation of the spool 18, but the present invention is not limited to this photographic film cartridge, and the cartridge body can be It can be carried out for a photographic film cartridge formed of resin.

[0020]

As described above, in the method of manufacturing a photographic film cartridge according to the present invention, the light shielding member is fixed to the inner wall of the film passage by one ultrasonic welding, so that the manufacturing efficiency can be improved. Further, before pressing the ultrasonic horn against the light blocking member, the light blocking member is pressed against the inner wall of the film passage by the pressing jig, so that the ultrasonic horn can be pressed firmly against the light blocking member, so that good welding is possible. It can be performed.

[Brief description of drawings]

FIG. 1 is a perspective view of an ultrasonic horn and a pressing jig used in a manufacturing process of a photographic film cartridge of the present invention.

FIG. 2 is an exploded perspective view of a photographic film cartridge.

FIG. 3 is a sectional view of the photographic film cartridge shown in FIG.

FIG. 4 is a diagram showing a manufacturing process of a photographic film cartridge.

5 is a perspective view showing a first modification of the ultrasonic horn shown in FIG.

FIG. 6 is a perspective view showing a second modification of the ultrasonic horn shown in FIG.

FIG. 7 is a perspective view showing a third modification of the ultrasonic horn shown in FIG.

8 is a perspective view showing a first modified example of the holding jig shown in FIG. 1. FIG.

9 is a perspective view showing a second modified example of the holding jig shown in FIG. 1. FIG.

[Explanation of symbols]

 2,55,58 Pressing jig 3,59 Notch 4,56 Pressing plate 6 Mounting plate 7 Telemp 10,45,47,50 Ultrasonic horn 11 49 Projection 15 Patrone body 24 Film passage 46,48 Projection 57 Opening

Claims (5)

[Claims] 1. A light-blocking member for blocking the entrance of external light is placed on the inner wall of a film passage formed in a resin cartridge body, and the tips of an ultrasonic horn are pressed against the four corners of the light-blocking member. A method for producing a photographic film cartridge, characterized in that the film is fixed to the inner wall of the film passage by ultrasonic welding once. 2. The tip of an ultrasonic horn is pressed against a light-shielding member, which is placed on the inner wall of a film passage formed in a resin-made cartridge main body and which blocks the entrance of external light, by ultrasonic welding once. In the method for manufacturing a photographic film cartridge in which the light blocking member is fixed to the inner wall of the film passage, the light blocking member placed on the inner wall of the film passage is pressed by a holding jig so as to avoid the tip, and then ultrasonic waves are applied. A method of manufacturing a photographic film cartridge, wherein the tip of a horn is pressed against a light shielding member to perform ultrasonic welding. 3. The ultrasonic horn includes a protrusion that is pressed against the light shielding member along the longitudinal direction of the light shielding member, and a plurality of protrusions that are alternately arranged along the protrusion and are pressed against the light shielding member. 3. The structure according to claim 2, wherein
A method for producing the described photographic film cartridge. 4. The method of manufacturing a photographic film cartridge according to claim 2, wherein the holding jig has a notch formed in a holding portion which is pressed against the light shielding member. 5. The outside of the film passage is prevented from entering the inner wall of the film passage formed in the photographic film cartridge by feeding the photographic film stored in the resin cartridge main body to the outside by the rotation of the spool. In the method for manufacturing a photographic film cartridge, a light-shielding member is placed, and after that, the tip of the ultrasonic horn is pressed against the light-shielding member and fixed to the inner wall of the film passage by one ultrasonic welding. A photographic film, characterized in that a light-shielding member placed on the inner wall of the ultrasonic horn is pressed by a pressing jig so as to avoid the tip of the ultrasonic horn, and then ultrasonic welding is performed by the ultrasonic horn. Patrone manufacturing method.