JPS61218007A - Flexible twisted flat cable and manufacturing apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a flexible twisted flat cable used for internal wiring of electronic devices or inter-device wiring, and an apparatus for manufacturing the same.

[Technical Background of the Invention] Flexible twisted flat cables have been known as cables used for internal wiring of electronic devices such as computers, communication devices, and measuring instruments, or for inter-device wiring.

The flexible twisted flat cable includes, for example, as shown in FIGS. 4 and 5, twisted portions T that are twisted in parallel in units of unit numbers (two in FIG. 5);
A plurality of flexible coated cables C in which flat portions F arranged in parallel without being twisted are alternately formed and a thermoplastic film S are heated aS. Since the coated cable C is partially twisted, it has excellent crosstalk characteristics, and the flat part has a so-called RuiDC.
Because the connector can be directly attached, there is no need for troublesome cable arrangement or wiring work, and because it has good flexibility, it can be used for wiring inside narrow devices. Conventional flexible twisted flat cables include a type in which a film S is heat-sealed to only one side of a coated cable C, as shown in FIG. There is a type in which a film S is heat-sealed on both sides of the cable C.

By the way, generally when attaching a connector to a flexible twist flat cable, the connector is attached to the flat part F.
However, when performing branching, it is better to have the length of the sheathed cable led out as long as possible, so branching is more often done from below the twist than from the flat part F.

[Problems with the Background Art] However, in the conventional flexible flat cable described above, the film S is heat-fused to the entire twisted portion T, so the twisted portion T is untwisted and connected to other wiring from this portion. If you want to create a branch, cut out the film S that is heat-fused to the twist part T with a cutter or the like, or
There is a problem in that the work is difficult because the fused portion must be peeled off.

[Object of the invention] The present invention has been made in view of the above-mentioned conventional circumstances.
In particular, the object of the present invention is to provide a flexible twisted flat cable that can extremely easily separate wires from a twisted portion, and an apparatus for manufacturing the flexible twisted flat cable.

[Summary of the Invention] That is, the present invention provides a method in which a thermoplastic film is applied to a plurality of coated cables in which twisted portions arranged in parallel and untwisted flat portions are alternately formed in units of units. The flexible twisted flat cable is heat-sealed and is characterized in that the film is partially fused to the twisted portion at a predetermined interval, and a flexible twisted flat cable is characterized in that the film is partially fused to the twisted portion at a predetermined interval, and A metal roll is formed in which a recessed part is formed, a metal block of a corresponding shape is fitted and fixed in the recessed part via a removable heat insulating material, and the metal roll rotates while the entire side surface is heated, and the metal rolls are twisted in unit numbers. This film is pressed against a thermoplastic film that is in contact with a plurality of coated cables that are supplied with twist portions that are parallel to each other and flat portions that are parallel to each other without being twisted. The apparatus for manufacturing the flexible twisted flat cable is configured to be heat-sealed to the flat part and some twisted parts of the coated cable.

[Embodiments of the invention] DESCRIPTION OF THE PREFERRED EMBODIMENTS Details of embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a plan view showing the structure of an embodiment of a flexible twisted flat cable according to the first invention.

In the figure, T indicates a twist portion in which a plurality of coated cables C are twisted in units of units and arranged in parallel, and F indicates a flat portion in which covered cables C are arranged in parallel without being twisted. A thermoplastic film S is heat-sealed to both sides of the covered cable C except for a portion T2 at the twist portion T. This pattern is alternately formed from the beginning end to the end end of the covered cable C.

Therefore, the flexible twist flat cable of this embodiment has a fused part T1 where the film S is fused to the twisted part T, and a non-fused part T1 where the film S is not fused.
2. Therefore, when splitting cables from the twisted part T, cut the required number of coated cables for one part of the unfused part T2, untwist the coated cable C, and separate the other cables from the twisted part T. When connected to a cable, branch line connection work can be performed without cutting or peeling off the film S.

In the flexible twist flat cable of this embodiment, the twist portion T is provided with two non-fused portions T2 of the film S, but the non-fused portions T2 may be provided at one or three or more locations.

Further, in the flexible twist flat cable of this embodiment, the film S is heat-sealed to both sides of the coated cable C, but the film S may be heat-sealed to only one side of the coated cable C.

FIG. 2 is a diagram showing an embodiment of the flexible twisted flat cable manufacturing apparatus according to the second invention.

In the figure, reference numeral 1 denotes a metal roll that is entirely heated by a heater 2 and has two recesses 1a formed at a predetermined interval. And the recessed part 1 of this metal roll 1
A metal block 4 having a shape corresponding to the core portion is fitted and fixed to a through a removable heat insulating material 3. Further, on the side surface of the metal roll 1, a flat part molded part t corresponding to the flat part F of the flexible twisted flat cable A shown in FIG. 1 and a twisted part molded part t1 corresponding to the twisted part T1 are formed. In order to uniformly press the entire cable C, the flat portion molded portion f is shaped to protrude slightly from the surrounding area. Two metal rolls 1 are arranged so that their side surfaces are close to each other, and each metal roll 1 rotates in the opposite direction while matching the position of the recessed part 1a on the side surface, that is, the position of the metal block 4. A covered cable C is sandwiched between two thermoplastic films S and inserted between them.

However, according to the apparatus of this embodiment, the side surface of the metal roll 1 is heated to a high temperature, but the metal block 4 that exists through the heat insulating material 3 has a lower temperature than the surroundings, so that the metal roll 1 is continuously heated. When the film S is pressed into contact with the metal block 4, the portion of the film S that comes into contact with the metal block 4 is not fused to the coated cable C.
Since the other portions are fused, it is possible to continuously manufacture a flexible twisted flat cable having a fused portion T1 and a non-fused portion T2 in the twisted portion T as shown in FIG.

Furthermore, in the apparatus of this embodiment, if the metal block 4 is directly fitted and fixed into the concave portion 1a of the metal roll 1 without inserting the heat insulating material 3, the metal block 4 will also be heated to a high temperature. The non-fused portion T2 can be made into the fused portion T1.

Note that in the device of this embodiment, the metal O-ru 1 has two concave portions 1a.
Although the metal block 4 is fitted and fixed at several locations, the recessed portion 1a may be provided at one location or at three or more locations. That is, the number of concave portions 1a may be determined depending on the number of unfused portions T2 desired to be provided in the twisted portion T of the flexible twisted flat cable to be manufactured.

FIG. 3 is a diagram showing the configuration of another embodiment of the second invention. The apparatus of the above-mentioned embodiment is an apparatus for manufacturing a flexible twisted flat cable in which the film S is heat-sealed to the coated cable C from both sides, but the apparatus of this embodiment is a machine for manufacturing a flexible twisted flat cable in which the film S is heat-sealed to the coated cable C from both sides. This is an apparatus for manufacturing a flexible twisted flat cable to which a film S is fused.

The apparatus of this embodiment also uses a metal roll 1 having the same configuration as in the previous embodiment, but a mere guide roller is disposed adjacent to the metal roll 1. That is, in this embodiment, the heater 2 of the metal roll 1 of either one of the embodiments described above is used.
It exhibits the same operation as when it is turned OFF, and is used when the film S is fused to only one side of the covered cable C.

Note that the guide roller 5 is not necessarily essential;
If the coated cable C and the film S are moved in a circular arc trajectory in the direction of the metal roll 1, the film S will be pressed against the metal roll 1, so that a similar flexible twisted flat cable can be manufactured.

[Effects of the Invention] As explained above, the flexible twisted flat cable of the first aspect of the present invention has a portion where the film is fused and a portion where the film is not fused at the twist portion. If you draw a dividing line on the part that is not fused,
There is no need to cut out or peel off the film, greatly improving work efficiency. Furthermore, according to the apparatus of the second aspect of the present invention, the flexible twisted flat cable of the first aspect of the present invention can be easily manufactured to meet various orders.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the configuration of an embodiment of the first invention;
FIG. 2 is a side view showing the configuration of an embodiment of the second invention;
FIG. 3 is a side view showing the configuration of another embodiment of the second invention, FIGS. 4 and 5 are plan views showing the configuration of a conventional flexible twisted flat cable, and FIGS. 6 and 7 are
The figure is a cross-sectional view showing a film fused state of a conventional flexible twisted flat cable. C・・・・・・・・・・・・Sheathed cable S・・・・・・
・・・・・・Film T・・・・・・・・・Twist part T1・・・・・・
...Fused part T2...Non-fused part F...Flat part 1...
・・・・・・Metal roll 1a・・・・・・Concave part

Claims (3)

[Claims] (1) A flexible cable made by heat-sealing a thermoplastic film to a plurality of coated cables, which are alternately formed with twist sections that are twisted in parallel in units of units and flat sections that are parallel without being twisted. A flexible twisted flat cable, characterized in that the film is partially fused to the twisted portion at a predetermined interval. (2) A plurality of recesses are formed at predetermined intervals on the side surface, and a metal block of a corresponding shape is fitted and fixed into the recesses via a removable heat insulating material, and the entire side surface is heated and rotated. The metal rolls are supplied while being in contact with a plurality of coated cables, which are supplied with twisted parts arranged in parallel and untwisted flat parts arranged in parallel in units of units. 1. An apparatus for manufacturing a flexible twisted flat cable, characterized in that the apparatus is configured to press the flexible twisted flat cable into contact with a thermoplastic film and heat-seal the film to the flat part and some twisted parts of the covered cable. (3) Two metal rolls are arranged with their side surfaces close to each other, and these metal rolls rotate while matching the positions of the recessed parts,
3. The flexible twisted flat cable manufacturing apparatus according to claim 2, wherein the coated cable is inserted between these metal rolls while being sandwiched between two films.