JPH0222995B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for forming a flat terminal by attaching a flat cable connector to an insulated wire core exposed at the terminal of a multicore round cable.

[Prior art]

I/O cables are usually used for signal transmission between a computer and a printer, or between a word processor and a printer or keyboard.
A flat cable is used. In this type of flat cable, the conductor spacing is 1.27 mm, and the insulator has a number of protrusions formed at a pitch corresponding to the conductor spacing. This flat cable is cut to a required length and used by attaching a flat cable connector to its terminal.

FIG. 1 shows the flat cable connector. The flat cable connector 1 is composed of a connector body 3 and a connector cover 5. The connector body 3 has a large number of slit terminals 7 on the top surface.
are arranged at a pitch corresponding to the conductor spacing of the flat cable, and the bottom surface has many male terminal insertion holes (not shown) into which male terminals from the equipment side are inserted.
is formed. The connector cover 5 also has a groove (not shown) on the bottom surface into which the slit terminal 7 is inserted.
and a groove 9 corresponding to the protrusion of the flat cable.
is formed. Lock pieces 11 are formed on both sides of the connector cover 5, and lock tubes 13 into which the lock pieces 11 are inserted are formed on both sides of the connector body 3.
is formed.

When attaching this connector 1 to the terminal of a flat cable, fix the connector main body 3, place the terminal of the flat cable on the slit terminal 7, and place the connector cover 5 on top of it. toward the connector body 3. Then, the insulator of the flat cable is pierced by the slit terminals 7, and the conductor is pushed into the slit of each terminal 7, thereby establishing an electrical connection between the two.

Recently, multi-core round cables using insulated wire cores coated with polyethylene, polyvinyl chloride, cross-linked foamed polyethylene, Teflon, etc. have come to be used instead of the above-mentioned flat cables. This type of multi-core round cable is
The insulated wire cores can be twisted in pairs and the space factor is small. Also, since it can be covered with a block shield, it has excellent noise resistance. Even when such a round cable is used, it is necessary to attach a flat cable connector to the terminal for connection with equipment.

Conventionally, in order to attach a flat cable connector to the terminal of such a multi-core round cable, the sheath of the terminal was peeled off, the exposed insulated wires were lined up in order on a suitable jig, and then heat press was applied. After heat-sealing the core wires into a flat cable, a flat cable connector is attached to that part in the same way as in the past. However, if such a method is adopted, the end of the round cable must be fused into a flat cable and made to be the same size as a normal flat cable.
There is a problem in that the outer diameter of each insulated core of a round cable cannot be reduced to a certain level or less.

Reducing the outer diameter of the insulated core of a round cable is extremely effective in all aspects, including miniaturization of equipment, easier wiring, and cost reduction. Therefore,
A multi-core round cable is made using insulated wire cores with a small outer diameter, and the insulated wire cores are attached one by one to the slit terminals of the connector body without fusing the terminals, and then they are bundled together using a connector cover. I tried using the method of pushing it into the slit terminal. However, with this method, because the outer diameter of the insulated wire core is small, there are large variations in the insertion position (depth) of the core conductor in the slit terminal, making it impossible to obtain a uniform electrical connection for each core. It turned out that there was a problem.

In addition, we have also tried attaching a flat cable connector after welding insulated wire cores with a small outer diameter onto a plastic sheet at predetermined intervals, but this method tends to cause irregularities in the core spacing. , there is a problem that connection with the connector cannot be made smoothly.

[Purpose of the invention]

In view of the above-mentioned problems, the purpose of the present invention is to
A flat terminal of a multi-core round cable that uses a multi-core round cable with an insulated core with a small outer diameter and can obtain a good electrical connection between each core and the slit terminal of a flat cable connector. The object of the present invention is to provide a forming method.

[Structure of the invention]

In order to achieve the above object, the present invention has a connector main body in which a large number of insulated wire cores exposed at the terminal of a multi-core round cable are arranged on the upper surface, and a groove in which the slit terminals are inserted on the lower surface. In the method of collectively connecting a flat cable connector with a connector cover having a connector cover to form a flat terminal, a first plastic sheet is placed on the top surface of the connector body, and the slit terminal is placed in a state in which the slit terminal protrudes from the top surface of the sheet. placing the insulated wire core exposed at the end of the round cable onto the corresponding slit terminal; placing a second plastic sheet so as to cover the wire core portion attached to the slit terminal; The present invention is characterized by comprising the steps of placing the connector cover on the second plastic sheet so as to face the connector body, and pressing it to join the connector cover to the connector body.

[Implementation row]

FIGS. 2 through 8 show one embodiment of the present invention.

First, as shown in Figure 2, the multi-core round cable 15
The sheath is peeled off to expose a large number of insulated wire cores 17, and each wire core 17 is untwisted. Further, a heat-shrinkable sleeve 19 is inserted into the sheath of the terminal portion of the round cable 15 in advance.

Next, as shown in FIG. 3, the connector body 3 of the flat cable connector is set on the workbench 21. In addition to the groove 23 in which the connector body 3 is set, the workbench 21 has a sheet holder 25 and a wire core holder 27.
A, 27B, etc. are formed. After the connector body 3 is set, a first plastic sheet 29 is placed thereon with a width that covers all the slit terminals 7 of the connector body. Thereafter, the sheet 29 is pressed onto the connector main body 3 by the sheet pressing jig 31. The sheet pressing jig 31 is the slit terminal 7
As a result of this pressing, the sheet 29 is pierced by the slit terminal 7 and placed on the connector body 3. Note that the sheet 29 has a length long enough to be placed on the sheet holder 25. The sheet 29 used is a nylon sheet and a polyethylene sheet laminated together with the latter facing upward. If this composite sheet has insufficient thermal fusion properties on the core wire (the core insulation is usually polyvinyl chloride or polyethylene), an ethylene-acrylic acid metal salt copolymer (commercial product It is best to use sheets stacked on top of each other.

Next, as shown in FIG. 4, each wire core 17 of the round cable 15 is attached to the slit terminal 7 of the connector body 3. The wire core 17 is connected to the wire core cradle 27A, 27B.
When set in accordance with a large number of grooves (not shown) formed on the upper surface of the holder, they are lined up at regular intervals. Once all the wire cores are set, the wire core 17 is press-fitted into the slit terminal 7 using the wire-core press-fitting jig 35. This wire core press-fitting jig 35 has a groove 37 on the lower surface into which the slit terminal 7 is inserted, and a number of grooves (not shown) formed at a pitch corresponding to the core spacing in a direction perpendicular to the groove 37.

Next, as shown in FIG. 5, a second plastic sheet 39 is placed to cover the wire core portion attached to the slit terminal 7, and the sheet 39 is pressed onto the wire core 17 by the sheet pressing jig 31. Due to this pressing, the slit terminal 7 penetrates the sheet 39. The width and length of the second plastic sheet 39 are the same as the first plastic sheet 29. As the second plastic sheet 39, it is preferable to use a polymer sheet having good heat-fusibility, such as a Surlyn sheet.

Next, as shown in FIG. 6, the connector cover 5 of the flat cable connector is placed over the second plastic sheet 39 so as to face the connector body 3, and is pressed by the cover pressing jig 41. It is combined with the connector main body 3.

Next, as shown in FIG. 7, the first and second plastic sheets 2 placed on the sheet pedestal 25 are
9 and 39 are fused by pressing the heating iron 43. A release sheet 45 is attached to the lower surface of the heating iron 43. Through this fusion, the wire core 1
7 and first and second plastic sheets 29,
39 will be integrated. Note that this fusion work may also be performed from the first plastic sheet 29 side by turning over the entire terminal to which the flat cable connector 1 is attached.

After this, the end with the flat cable connector 1 is removed from the workbench 21, the wire core 17 protruding from the end of the connector 1 and the first and second plastic sheets 29, 39 are trimmed, and the heat shrink sleeve is removed. 19 is placed at the mouth of the sheath of the round cable 15 and heat-shrinked, a flat terminal as shown in FIG. 8 is completed. Note that 45 is a heat-sealed portion.

When a flat terminal is formed as described above,
The core of a round cable is sandwiched between the connector body and the connector cover with plastic sheets applied to the top and bottom, so even if the outer diameter is small, the core of the round cable is held between the top and bottom plastic sheets. The insertion site of the core conductor within the slit terminal is regulated and becomes constant. Therefore, a uniform electrical connection state can be obtained for all the wire cores. The thickness of the first and second plastic sheets may be determined according to the outer diameter of the wire core, for example, if the outer diameter of the wire core is 0.6
mm, the thickness of the first plastic sheet is
0.3~0.4mm, the thickness of the second plastic sheet is
Approximately 0.2mm is appropriate. By the way, even when the above-mentioned terminal was subjected to vibration tests with an amplitude of 1.5 mm and a frequency of 50 Hz for 6 hours each in the vertical, horizontal, and front-back directions, no change in contact resistance at the slit terminal was observed. Furthermore, in the above embodiment, since the first and second plastic sheets are heat-sealed at the part on the round cable side of the flat cable connector, many wire cores are integrated at this part, and some Even if force is applied to the wire core, it is no longer directly transmitted to the slit terminal portion, making it possible to obtain a mechanically extremely stable flat terminal.

The above is an example of the present invention, and the present invention is not limited thereto.

For example, in the above embodiment, the wire core was pushed into the slit terminal and then covered with the second plastic sheet. It may also be done together with the sheet.

Further, in the above embodiment, the first and second plastic sheets are pierced by the slit terminal, but a cut through which the slit terminal can be passed may be previously formed in one or both of the sheets.

Further, in the above embodiment, the first and second plastic sheets are fused together, but this fusion can be done as needed. The core wires may be integrated by the above method.

〔Effect of the invention〕

As explained above, according to the present invention, after placing the first plastic sheet on the connector body, the insulated wire core is attached to the slit terminal, and then the second plastic sheet is placed on top of the insulated wire core. Since the connector cover is crimped from the inside, even if the outer diameter of the insulated wire core of a round cable is small, each wire core can be inserted into the slit terminal by the first and second plastic sheets. There is an advantage that the electrical connection state is made constant and a uniform electrical connection state is obtained for all the wire cores.

[Brief explanation of drawings]

Fig. 1 is a front view showing a flat cable connector, Fig. 2 is a side view showing the terminal of a multi-core round cable, and Figs. FIG. 8 is a side view showing the process, and a plan view showing a flat end of a multi-core round cable formed by the same method. DESCRIPTION OF SYMBOLS 1... Flat cable connector, 3... Connector body, 5... Connector cover, 7... Slit terminal, 15... Round cable, 17... Insulated wire core, 29... First plastic sheet, 39 …
...Second plastic sheet, 47...Fusion part.

Claims (1)

[Scope of Claims] 1. A connector cover having a large number of insulated wire cores exposed at the terminals of a multi-core round cable, a connector main body with a large number of slit terminals arranged on the upper surface, and a groove on the lower surface into which the slit terminals are inserted. In a method of forming a flat terminal by collectively connecting a flat cable connector consisting of a first plastic sheet, a first plastic sheet is placed on the top surface of the connector body in such a manner that the slit terminal protrudes from the top surface of the sheet. a step of attaching the insulated wire core exposed at the end of the round cable to the corresponding slit terminal; placing a second plastic sheet so as to cover the insulated wire core portion attached to the slit terminal; A flat terminal of a multicore round cable, comprising: a step of facing the connector cover from above the second plastic sheet to the connector body and pressing it to join the connector cover to the connector body. Formation method. 2. The method according to claim 1, comprising:
The insulated wire core is pushed into the slit terminal before the second plastic sheet is placed. 3. The method according to claim 1, comprising:
The insulated wire core is pushed into the slit terminal after the second plastic sheet is placed thereon. 4. The method according to claim 1, comprising:
The method includes the step of welding the first and second plastic sheets together at a location on the round cable side of the flat cable connector. 5. The method according to claim 1, comprising:
A cut is previously formed in one or both of the first and second plastic sheets to allow the slit terminal to pass through.