JPH0355009B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a shielded ribbon cable that is wired to electronic equipment via a printed circuit board or a conductor insertion type one-touch connector.

[Prior art]

Conventionally, as a method for manufacturing a shielded ribbon cable, a method disclosed in Japanese Patent Application Laid-open No. 124310/1983 is known. This method involves extruding a cable core in which multiple conductors and drain wires are covered with an insulation coating, then cutting the insulation coating with a heating knife to expose a portion of the drain wire; This method covers the cable core with a shield.

[Problem that the invention seeks to solve]

In the above-mentioned conventional technology, a part of the insulator near the drain wire located at the side edge of the cable core is cut with a heated cutter to expose the drain wire, which causes the following problems. be.

That is, generally the outer diameter of the drain wire of this type of cable is approximately equal to the outer diameter of the conductor, approximately 0.4 mm.
It is extremely thin, approximately 0.6 mm. In addition, the insulation coating extruded around each conductor and drain wire shrinks irregularly when cooled in a cooling water tank, so the width of the cable core is not constant and varies slightly. is occurring.

For this reason, it is extremely difficult to accurately cut a minute amount of the drain wire and the insulator located outside it with a cutter to expose a certain area of the drain wire. There are drawbacks to doing so.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a shielded ribbon cable that advantageously eliminates the above-mentioned problems.

[Means for solving problems]

To achieve the above objective, when obtaining the cable core by extruding the insulation coating, only the plurality of conductors are supplied, and only the receiving groove for the drain wire is preformed in the cable core, and the subsequent process Fit the drain wire into the groove,
Next, a shield layer is coated on the outside so as to be in direct contact with the outside.

[Effect]

The drain wire engages with the drain wire receiving groove of the cable core, which is formed in advance at a predetermined position, with its side surface exposed.

〔Example〕

1 to 3 show an embodiment of the first invention, in which a plurality of conductors 1, 1, . . . are arranged parallel to each other at a constant pitch from supply reels 10, 10, The cable cores 4 are guided into an extrusion molding machine 11 so as to be located on the same plane, and a common insulator 2, such as heat-resistant vinyl, is extruded and coated on the outside of each conductor 1 to form a cable core 4. At this time, by adjusting the die and nipple (not shown) of the extrusion molding machine, one drain wire receiving groove 3 is formed in the side edge of the insulator 2 along its longitudinal direction, parallel to the conductor, and for each conductor. It is extruded at a position that is the same pitch as the pitch P in between. Next, this cable core 4 is cooled and solidified in a cooling water tank (not shown), and then guided to a longitudinal forming machine 12.

This vertical forming machine 12 is a well-known device that laminates a flat shield tape 6, for example, a shield tape laminated with a metal foil tape such as copper foil or aluminum foil on the inside and a plastic tape such as polyester on the outside. As it progresses, the cross section gradually becomes oval or rectangular. Therefore, while the cable core 4 is being run through the longitudinal forming machine 12, the shielding tape 6 is being passed through the reel 13 of the cable core 4.
A shield layer 6 is formed around the cable core 4.

At this time, when the drain wire 5 is pulled out from the reel 14 together with the shield tape 6 and supplied while fitting into the drain wire receiving groove 3 formed in advance on the cable core 4 so that its side surface is exposed, the drain wire 5 is pulled out from the side surface of the drain wire. is fixed in the receiving groove 3 while being pressed and in contact with the shield layer 6. Further, these are sent to an extrusion molding machine 15, and a protective sheath 7, such as heat-resistant vinyl, is extrusion coated thereon.

As shown in FIG. 4, instead of extruding the protective sheath, a pair of insulating protective tapes 7A and 7B can be attached from both sides with adhesive or heat fusion. This method does not require a protective sheath extruder.

In the above example, only one drain wire receiving groove 3 is formed on the side edge of the cable core, but instead, one conductor in the center of the cable core is omitted and a drain wire receiving groove 3 is formed there. A part of the side wall of the through hole may be cut out to form a drain wire receiving groove, or one or more drain wire receiving grooves may be formed as a whole.

FIG. 5 shows a cross section of a cable manufactured by the method of the second invention.
In the case of the invention, after the same drain wire 3 is engaged with the cable core obtained by the same intermediate process as the first invention, adhesive is applied from both sides using a pair of shield tapes 6A and 6B. The protective tape, for example, heat-resistant vinyl tapes 7A and 7B, is attached to the outer side of the protective tape by heat sealing or adhesive. It is preferable that the shield tape has a two-layer structure with a metal foil such as copper or aluminum on the inside and a polyester film on the outside.

6 to 9 show an embodiment of the third invention, in which the cable core 4 is manufactured in an intermediate process like the first invention, but the drain wire receiving groove is not extruded. different. That is, in the third invention, after the cable core 4 is extruded, the cable core is cut by a cutting means 16, such as a rotating cutter or a heating cutter, to form the drain wire receiving groove 3. The subsequent steps are completely the same as in the first invention.

FIG. 10 shows a cross section of a cable manufactured according to the fourth invention, and in the case of this fourth invention, it is obtained by the same intermediate process as the intermediate process of the third invention. The third cable core 4 is also
After the drain wire 5 is engaged with the drain wire receiving groove 3 in the same way as in the invention of
a pair of shielding tapes 6 from the outside of the cable core and drain wire in contact with the
A and 6B are sandwiched together in a sandwich shape through an adhesive, and furthermore, a protective tape such as heat-resistant vinyl tape 7A and 7B is integrally coated on the outside with an adhesive or heat fusion. . Note that the structure of the shield tape is preferably the same as that explained in the second invention.

〔Effect of the invention〕

According to this invention, a drain wire receiving groove is formed in advance at a predetermined position of the cable core, the drain wire is engaged with the groove in a subsequent process, and then the shield layer is coated so as to directly contact the drain wire. (1)
There is no need to remove the insulation coating of the drain wire, (2) the drain wire can be placed accurately at the intended predetermined position, and (3) the drain wire and the shield layer are configured to be in direct contact with each other. There are effects such as being able to obtain a shielded ribbon cable with good shielding effect.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the implementation status of the first invention;
FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, FIG. 3 is a cross-sectional view taken along line B-B in FIG. 1, and FIG. 4 is a cross-sectional view of a cable obtained by another embodiment of the first invention. FIG. 5 is a cross-sectional view of a cable obtained by the second invention, FIG. 6 is an explanatory diagram showing the implementation status of the third invention, and FIG. 7 is a cross-sectional view of the cable obtained by the second invention.
C sectional view, FIG. 8 is a DD sectional view in FIG. 6, FIG. 9 is an E-E sectional view in FIG.
FIG. 0 is a cross-sectional view of a cable obtained according to the fourth invention. In the figure, 1 is a conductor, 2 is an insulator, 3 is a drain wire receiving groove, 4 is a cable core, 5 is a drain wire, 6 is a shield layer, 7 is a protective sheath,
6A and 6B are shield tapes, 7A and 7
B is a protective tape.

Claims (1)

[Claims] 1. A plurality of conductors 1, 1, ... are extruded and coated with a common insulator 2 such that they are located parallel to each other at a constant pitch and on the same plane, and at the same time, this insulator 2 While running the cable core 4 having at least one drain wire receiving groove 3 extruded in parallel with the conductor along its longitudinal direction, the drain wire 5 is fitted into the drain wire receiving groove 3, and then the cable core 4 is fitted into the drain wire receiving groove 3. A method for manufacturing a shielded ribbon cable, comprising: coating the outside of the shield layer 6 with a shield layer 6, bringing the shield layer into contact with the drain wire, and further covering the entire outer circumference with a protective sheath 7. 2. The method of manufacturing a shielded ribbon cable according to claim 1, wherein the shield layer 6 is coated vertically. 3. The method of manufacturing a shielded ribbon cable according to claim 1, wherein the shield layer 6 is wound and coated. 4. The method of manufacturing a shielded ribbon cable according to claim 1, wherein the protective sheath 7 is extrusion coated. 5 The protective sheath 7 includes a pair of insulating protective tapes 7
The method for manufacturing a shielded ribbon cable according to claim 1, characterized in that the shielded ribbon cable is constructed by coating A and 7B. 6 A plurality of conductors 1, 1, ... are extruded and coated with a common insulator 2 so as to be located parallel to each other at a constant pitch and on the same plane, and at the same time, a common insulator 2 is coated with a common insulator 2 along its longitudinal direction. While running a cable core 4 having at least one drain wire receiving groove 3 extruded in parallel with the conductor, a drain wire 5 is fitted into the drain wire receiving groove 3 and then brought into contact with the drain wire. A pair of shield tapes 6A, 6B and a pair of protective tapes 7A, 7 are placed on both sides of these.
A method for manufacturing a shielded ribbon cable, characterized by laminating B. 7. The method of manufacturing a shielded ribbon cable according to claim 6, wherein the shield tape 6A and the protective tape 7A and the shield tape 6B and the protective tape 7B are respectively laminated integrally in advance. 8 A cable core 4 extruded and coated with a common insulator 2 is run so that a plurality of conductors 1, 1, ... are located parallel to each other at a constant pitch and on the same plane, and the cable core 4 is extruded and covered with a common insulator 2. At least one drain wire receiving groove 3 is carved in the insulator 2 along its longitudinal direction, and then, while a drain wire 5 is fitted into the drain wire receiving groove 3, a shield layer 6 is coated on the outside of the drain wire 5. A method for manufacturing a shielded ribbon cable, which comprises bringing it into contact with a drain wire and further covering the outside with a protective sheath 7. 9 A cable core 4 covered with a common insulator 2 is run so that a plurality of conductors 1, 1, ... are located parallel to each other at a constant pitch and on the same plane, and the insulation of this cable core is body 2
At least one drain wire receiving groove 3 is carved along the longitudinal direction of the drain wire receiving groove 3, and then, after fitting the drain wire 5 into the drain wire receiving groove 3, a pair of drain wire receiving grooves 3 are formed on both sides of the drain wire so as to be in contact with the drain wire. A method for manufacturing a shielded ribbon cable, comprising laminating shield tapes 6A, 6B and protective tapes 7A, 7B, respectively.