JP2000030552A - Flat cable manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flat cable having a good insulation property between conductors by ensuring the adhesiveness between insulating films. SOLUTION: A plurality of linear conductors 5 are arranged between a pair of insulating films 3, 4 applied with a fused adhesive, and the insulating films 3, 4 are pinched and thermally crimped by a pair of thermocompressive bonding rolls 2 to manufacture a flat cable 1. The thermal crimp rolls 2 are constituted of an elastic roll 20 and a metal roll 21. The metal roller 21 is provided with pressing lugs 210 pressing the portions between the conductors 5 of the insulating films 3, 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat cable manufacturing apparatus for manufacturing a flat cable formed by laminating a plurality of conductors between insulating films.

[0002]

2. Description of the Related Art In recent years, as a wiring cable for electronic equipment, for example, a flat cable formed by sandwiching a plurality of linear conductors between a pair of flexible insulating films and laminating them in a laminated manner has been known. Used.

Conventionally, such a flat cable is manufactured by using a flat cable manufacturing apparatus 100 as shown in FIG.
It is manufactured by. As shown in FIG. 5, the flat cable manufacturing apparatus 100 has a thermocompression roll 102 composed of, for example, a metal roll 120 made of metal and an elastic roll 121 having an elastic surface. Here, the metal roll 120 and the elastic roll 121 have smooth crimping surfaces 120a and 121a, and both are heated to a high temperature.

[0004] A certain pressure and heat are applied to the insulating films 103 and 104 from the metal roll 120 and the elastic roll 121, whereby the insulating films 103 and 104 are heated.
The adhesive applied to the insulating film 10
The laminated flat cable 10 is laminated (laminated) with the conductor 105 sandwiched between 3, 3
6 are sequentially wound by a winding bobbin.

[0005]

However, in such a conventional flat cable manufacturing apparatus 100, the insulating film 103,
Although the adhesiveness with 104 is good, the pressing force is hardly transmitted from the metal roll 120 and the elastic roll 121 to the portions of the insulating films 103 and 104 between the conductors 105, so that the adhesiveness between the insulating films 103 and 104 is poor. As a result, there has been a problem that the formation of an air layer in this portion results in poor insulation between the conductors 105 of the insulating films 103 and 104.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems of the prior art, and an object of the present invention is to ensure the adhesion between insulating films by ensuring the insulation between conductors. It is an object of the present invention to provide a flat cable manufacturing apparatus capable of obtaining a flat cable having good performance.

[0007]

According to a first aspect of the present invention, there is provided an image forming apparatus comprising: a plurality of linear conductors arranged between a pair of insulating films provided with a fusible adhesive; A flat cable manufacturing device having a pair of thermocompression rolls for thermocompression bonding with the insulating film interposed therebetween in a state, wherein the thermocompression rolls are provided with a pressing protrusion for pressing a portion between the conductors of the insulation film. This is a flat cable manufacturing apparatus characterized in that:

In the case of the first aspect of the present invention, the portion between the conductors of the insulating film is pressed by the pressing protrusion provided on the thermocompression roll, and the distance between the insulating films is reduced at this portion. The adhesion between the conductors and the adhesive between the conductor and the fusible adhesive are also improved. As a result, according to the present invention, the air layer (unattached portion) between the conductors is significantly reduced, and thus the insulation between the conductors can be improved.

Further, according to the present invention, the alignment accuracy of the conductor can be improved by the groove formed between the pressing projections.

In this case, as in the second aspect of the present invention,
In the first aspect of the present invention, the width of the pressing projection may be smaller than the interval between the plurality of conductors.

According to the second aspect of the present invention, since the pressing protrusion surely enters between the conductors during thermocompression bonding, the insulating films between the conductors can be pressed and laminated more smoothly. It is possible to further improve the alignment accuracy of the conductor.

According to a third aspect of the present invention, in the first aspect of the present invention, the height of the pressing protrusion is adjusted to the thickness of the pair of insulating films and the thickness of the conductor. It is also effective to make it smaller than the total thickness.

According to the third aspect of the present invention, since the conductor portion of the insulating film is pressed by the groove bottom portion between the pressing protrusions of the thermocompression roll, the adhesion between the insulating film and the conductor is further improved. It becomes possible to do.

Further, in order to perform the lamination with high accuracy in the present invention, in the invention according to any one of claims 1 to 3, as in the invention according to any one of claims 1 to 3, the pressing protruding portion may be provided with the pair of the pressing protrusions. Of the thermocompression bonding rolls, the one having a higher hardness, for example, a metal thermocompression bonding roll may be provided.

It is also effective that the pressing projections are arranged at the same pitch as the conductors.

According to the fifth aspect of the present invention, since the pressing protrusions can be arranged in the same positional relationship with respect to the conductors, it is possible to perform the pressing in a uniform state between the conductors. .

On the other hand, a sixth aspect of the present invention is the invention according to any one of the first to fifth aspects, wherein a pair of the thermocompression rolls having a smooth thermocompression surface are provided in front of the thermocompression roll having the press projection. Is a flat cable manufacturing apparatus characterized in that a thermocompression roll is provided.

According to the sixth aspect of the present invention, since the portions on the conductors of the insulating film are already laminated by the thermocompression roll, it is not necessary to press the insulating film with the bottom of the groove of the thermocompression roll. . For this reason,
ADVANTAGE OF THE INVENTION According to this invention, even if the thickness of a conductor changes, what is necessary is just to match the height of a press protrusion with the thickest conductor, and there exists an advantage that it is not necessary to replace a thermocompression bonding roll.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a flat cable manufacturing apparatus according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view illustrating a schematic configuration of a main part of the flat cable manufacturing apparatus according to the present embodiment. FIG. 2A is a cross-sectional view of a flat cable and a thermocompression roll before thermocompression bonding in the present embodiment.
(B) is sectional drawing of the flat cable and thermocompression roll after thermocompression bonding in this Embodiment.

As shown in FIG. 1, a flat cable manufacturing apparatus 1 of the present embodiment has a thermocompression roll 2 composed of a pair of elastic rolls 20 and a metal roll 21 which can be heated to a predetermined temperature. In this way, a pair of insulating films 3 and 4 and a plurality of conductors 5 are passed between the elastic roll 20 and the metal roll 21 so that they are laminated.

The thermocompression bonding roll 2 has an elastic roll 2
0 is arranged, and a metal roll 21 is arranged on the upper side. In this case, the rotation shafts 20a and 21a of the elastic roll 20 and the metal roll 21 are arranged to be oriented in the horizontal direction, respectively.

In the present embodiment, the elastic roll 20
For example, a metal roll is used in which a sheet made of an elastic material such as rubber is wound around a surface of a metal roll to give elasticity to a surface portion thereof.

On the other hand, as the metal roll 21, a roll made of metal such as stainless steel is used. The elastic roll 20 and the metal roll 21 are configured to rotate in the direction of arrow A or the direction of arrow B as the insulating film 3 is transported.

The elastic roll 20 and the metal roll 21 are configured to be movable up and down relatively, so that the nip pressure at the time of lamination can be finely adjusted.

On the other hand, the metal roll 21 and the elastic roll 20
Is provided with a heater (not shown), whereby the metal roll 21 and the elastic roll 20 are heated to 140 ° C.
The temperature is controlled to about the same level.

As shown in FIG. 1, an insulating film roll 3 made of resin such as polyester is provided below and above the thermocompression roll 2 on the downstream side in the film transport direction X.
0, 40 are provided, and these insulating film rolls 3 are provided.
The insulating films 3 and 4 unwound from 0 and 40 are guided between the metal roll 21 and the elastic roll 20.

In this embodiment, a large number of conductors (not shown in the drawings) unwound from a bobbin (not shown) are fed in parallel in the direction of arrow Q at a constant interval. , Elastic roll 20 and metal roll 21
Are sandwiched between the insulating films 3 and 4. The conductor 5 is, for example, a tin-plated rectangular conductor.

On the other hand, a winding bobbin 7 for winding the flat cable 6 laminated by the thermocompression roll 2 is provided downstream of the thermocompression roll 2 in the film transport direction X. Is driven to rotate in the direction of arrow C by a drive mechanism (not shown).

As shown in FIGS. 2 (a) and 2 (b), a hot-melt type adhesive (fusible adhesive) 8 is applied to opposing surfaces of the insulating films 3 and 4. Note that FIG.
(A) In (b), for convenience, the flat cable 6 is used.
The elastic roll 20 and the metal roll 21 are shown apart from each other.
Numerals 1 are in close contact with the flat cables 6, respectively.

FIG. 3 is an explanatory view showing the dimensional relationship of the laminated portion of the flat cable 6 obtained according to the present embodiment. In the case of this embodiment, the insulating films 3 and 4
The thickness t1 is, for example, about 25 μm. The thickness t2 of the adhesive 8 is about 50 μm.

On the other hand, each conductor 5 has a width L of 0.8 m.
A rectangular cross section having a thickness of about m and a thickness T of about 35 μm is used. The distance D between the conductors 5 is 0.45 m
It is set to a constant value of about m. Thus, the pitch P (L + D) between the conductors 5 is set to a value of about 1.25 mm.

As shown in FIGS. 1 and 2A and 2B,
A large number of ring-shaped pressing projections 210 are provided on the surface of the metal roll 21. In the case of the present embodiment, each pressing protrusion 210 is formed to have a rectangular cross section, and each pressing protrusion 210 is formed so as to be located at the center of the adjacent conductor 5.

In the case of the present embodiment, the pitch P1 between the pressing projections 210 is configured to be equal to the pitch P between the conductors 5. Also, the width W of each pressing protrusion 210
Is set to be smaller than the interval between the conductors 5. In this case, the width W of each pressing projection 210 is not particularly limited, but from the viewpoint of adhesion, it is 0.2 to 0.2.
It is preferably 4 mm.

The height H of each pressing projection 210 is not particularly limited, either. However, from the viewpoint of ensuring the adhesion between the conductor 5 and the insulating films 3 and 4 at the portion of each conductor 5,
It is preferably set to 1.0 mm or less, more preferably 0.05 to 0.1 mm. And the metal roll 21
As a result of the provision of such pressing protrusions 210, a groove 211 is formed between each pressing protrusion 210.

In the flat cable 6 manufacturing apparatus 1 of the present embodiment having such a configuration, the insulating films 3 and 4 and the conductor 5 are unwound as in the prior art, and these are thermocompressed by the thermocompression roll 2. And laminate.

Here, in the case of the present embodiment, the portion between the conductors 5 of the insulating films 3 and 4 is pressed by the pressing protrusion 210 provided on the metal roll 21, and the insulating films 3 and 4 are pressed at this portion. Since the distance between them becomes smaller, the adhesion between the insulating films 3 and 4 is improved,
The adhesion between the conductor 5 and the adhesive 8 is also improved. As a result, according to the present embodiment, an air layer (unattached portion) between conductors 5
Is greatly reduced, whereby the insulation between the conductors 5 can be improved.

If the height H of the pressing protrusion 210 of the metal roll 21 is smaller than the sum of the thickness t1 of the insulating film 4 and the thickness T of the conductor 5 on the pressing protrusion 210 side, the height of the metal roll 21 can be reduced. Since the portion of the insulating film 4 on the conductor 5 is pressed by the bottom of the groove 211 between the pressing protrusions 210, the insulating film 4 and the conductor 5 can be securely adhered.

Further, according to the present embodiment, the alignment accuracy of the conductor 5 can be improved by the groove 211 formed between the pressing projections 210.

Furthermore, in this embodiment, since the pressing projections 210 of the metal roll 21 are arranged at the same pitch (P = P1) as the conductors 5, the pressing projections are 210 can be arranged in an equal positional relationship, so that pressing can be performed in a uniform state between the conductors 5.

FIG. 4 is a perspective view showing a schematic configuration of a main part of another embodiment of the flat cable manufacturing apparatus according to the present invention. In the following, portions corresponding to those in the above embodiment are denoted by the same reference numerals. The detailed description is omitted.

As shown in FIG. 4, in the present embodiment, another pair of thermocompression rolls having a smaller diameter than the thermocompression roll 2A is provided downstream of the thermocompression roll 2A, that is, downstream of the film transport direction P. 2B is provided. Here, the thermocompression roll 2B is composed of an elastic roll 20B and a metal roll 21B similarly to the thermocompression roll 2B, and the metal roll 20B is provided with a pressing protrusion 21 similar to the above embodiment.
0B and a groove 211B are provided. The elastic roll 20B and the metal roll 21B are configured to be heated to a predetermined temperature similar to that of the thermocompression bonding roll 2 described above.

On the other hand, the thermocompression roll 2A at the former stage comprises an elastic roll 20A similar to the above embodiment and a metal roll 21A having a smooth compression surface similar to the prior art. It is configured so that the same temperature as that of the thermocompression roll 2 can be heated to a predetermined temperature.

According to the present embodiment, the insulating film 3
4 is already laminated by the elastic roll 20A and the metal roll 21A, there is no need to press the insulating film 4 with the bottom of the groove 211B of the metal roll 21A. Therefore, according to the present embodiment, there is an advantage that a flat cable excellent in adhesive strength, insulation between conductors, and dimensional accuracy between conductors can be stably produced. Other configurations and operational effects are the same as those of the above-described embodiment, and thus detailed description thereof will be omitted.

It should be noted that the present invention is not limited to the above-described embodiment, and various changes can be made. For example,
The pressing protrusion of the metal roll constituting the thermocompression bonding roll can be provided integrally by processing the metal roll to form a groove, or a ring-shaped member can be fitted to a smooth metal roll. It is also possible to provide by combining.

Further, the shape of the pressing surface of the pressing protrusion may be not only a planar shape but also a convex curved surface shape, for example.

[0046]

As described above, according to the present invention, the adhesion between the insulating films and the adhesion between the conductor and the fusible adhesive can be improved, thereby improving the insulation between the conductors. Flat cable can be manufactured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of a main part of an embodiment of a flat cable manufacturing apparatus according to the present invention.

FIG. 2A is a cross-sectional view of a flat cable and a thermocompression roll before thermocompression bonding in the embodiment. (B): Sectional drawing of the flat cable and thermocompression roll after thermocompression bonding in the embodiment.

FIG. 3 is an explanatory diagram showing a dimensional relationship of a laminated portion of the flat cable obtained by the embodiment.

FIG. 4 is a perspective view showing a schematic configuration of a main part of another embodiment of the flat cable manufacturing apparatus according to the present invention.

FIG. 5 is a perspective view showing a schematic configuration of a main part of a conventional flat cable manufacturing device.

[Explanation of symbols]

 2 Thermo-compression roll 3, 4 Insulating film 5 Conductor 6 Flat cable 20 Elastic roll (thermo-compression roll) 21 Metal roll (thermo-compression roll) 210 Press projection 211 Groove

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshimasa Taniguchi 12-3 Satsuki-cho, Kanuma-shi, Tochigi Pref.

Claims (6)

[Claims] 1. A flat cable manufacturing method comprising: a pair of thermocompression rolls for thermocompression bonding with a plurality of linear conductors arranged between a pair of insulation films to which a fusible adhesive is applied and sandwiching the insulation film. A flat cable manufacturing apparatus, wherein a pressing protrusion for pressing a portion between the conductors of the insulating film is provided on the thermocompression roll. 2. The flat cable manufacturing apparatus according to claim 1, wherein the width of the pressing protrusion is smaller than the interval between the plurality of conductors. 3. The flat cable according to claim 1, wherein the height of the pressing projection is smaller than the sum of the thickness of the pair of insulating films and the thickness of the conductor. manufacturing device. 4. The thermocompression bonding roll according to claim 1, wherein said pressing projection is provided on a thermocompression bonding roll having a higher hardness among said pair of thermocompression bonding rolls. Flat cable manufacturing equipment. 5. The flat cable manufacturing apparatus according to claim 1, wherein the pressing projections are arranged at the same pitch as the conductor. 6. A thermo-compression roll having a smooth thermo-compression surface is provided in front of the thermo-compression roll having the pressing protrusion. Item.