JP3007754B2 - Flat cable manufacturing method - Google Patents

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 technique and, more particularly, to a method of manufacturing a flat cable having a parallel fusion spliced portion in a longitudinal direction.

[0002]

2. Description of the Related Art Conventionally, in a flat cable, especially a twisted flat cable, a parallel portion is heated and pressed by a mold to form a parallel fusion-bonded portion, which is once wound around a reel, and then wound off.
All the reels were subjected to the heat treatment in the thermostat in the f-line.

[0003]

In the above-described method, the degree of heat applied to the outer, middle, and inner portions of the reel wound around the cable is different, so that the variation in the pitch between conductors in the parallel fusion portion tends to be large. Was.

In addition, the pitch between conductors of the parallel fusion spliced portion changes with the passage of time depending on the waiting time until the user uses the product after the product is wound up on a reel, and sometimes the variation becomes too large to collectively connect the connectors. There was a risk that the product could be defective enough to make a connection impossible.

As described above, since the conventional heat treatment is incomplete and requires a separate process, the accuracy of the pitch between conductors of the parallel fusion joint, which is a key point of the flat cable, remains within a certain range, and the condition is satisfactory. It was not finished.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and can greatly improve the dimensional accuracy of the parallel fusion spliced portion of the flat cable, and provides a flat cable which does not change with time.
It is intended to provide a manufacturing method .

[0007]

Method of manufacturing a flat cable provided by the present invention According to an aspect of the untwisted parallel portion by a die
The insulation of each core is fused by pressing and heating.
Forming a parallel welding part to be adhered to each other;
The hot air is blown by the blower heater
Thermal stress can be removed by spraying the
It is characterized by that.

[0008]

[0009]

FIG. 1 shows an embodiment of the present invention in which a twist flat cable is manufactured.

However, the twisted flat cable 3
The twisted flat cable is made so as to repeat from the twisted portion of one twisted portion to the twisted portion-untwisted parallel portion-twisted portion, and the non-twisted parallel portion is pressed and heated by the mold 2 so that each core is heated. Is formed as a predetermined twisted flat cable by forming a parallel fused portion 4 where the insulators are fused to each other, and is pulled by a pulling machine 5.

In the process of forming the parallel fusion spliced portion 4, the insulator of the cable is subjected to rapid thermal deformation by the mold 2 to obtain a predetermined fusion structure, so that thermal stress remains on the cable. However, in order to remove the thermal stress, a blower heater 6 is arranged between the mold 2 and the take-up machine 5, and the hot air 7 obtained by the blower heater 6 is directly spread over the entire width of the ongoing twist flat cable 3. It sprays.

The blower heater 6 blows out the heated air from the air intake 6a as hot air 7 from the hot air outlet 6b. Since it is conceivable that the cable may be burned out, it is preferable to provide a waste heat outlet 6c facing the hot air outlet 6b, and to release the exhaust heat 8 during the stop. Hot air 7
The switching between the heat and the exhaust heat 8 may be achieved by adding a means for changing the flow of the wind, such as providing a switching valve at the connection between the hot air outlet 6b and the exhaust heat outlet 6c.

In the above-described embodiment, a twisted flat cable is used. However, the manufacturing method and apparatus of the present invention can be applied to a flat cable having no twisted pair and having a parallel fusion spliced portion in a longitudinal direction. Applicable.

[0014]

According to the method of manufacturing a flat cable according to the present invention as described above, the flat cable having the parallel fusion bonded portion formed by heating and pressurizing is further subjected to heat treatment by blowing hot air. Since the thermal stress in the portion is removed, the pitch between the conductors of the parallel fusion spliced portion can be made highly accurate and uniform in the longitudinal direction, and the dimensional accuracy can be guaranteed over time so that it can be stable for a long time.

[0015]

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a process of manufacturing a flat cable according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Twisted part 2 Die 3 Twist flat cable 4 Parallel fusion part 5 Pick-up machine 6 Blower heater 6a Air intake 6b Hot air outlet 6c Exhaust heat outlet 7 Hot air 8 Exhaust heat

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masaaki Aoyagi 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture Inside the Hidaka Plant of Hitachi Cable Co., Ltd. (56) References JP-A-63-292522 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01B 13/00-13/32 H01B 7/08

Claims (1)

(57) [Claims] 1. A non-twisted parallel portion is pressed by a mold and heated.
Parallel fusion where the insulators of each wire core are fused together
Part, and then placed between the mold and the take-off machine
A method for manufacturing a flat cable, comprising: removing a thermal stress by blowing hot air to the parallel fusion bonding portion with a blower heater .