JPH04179007A - Manufacture of shielded cable - Google Patents

Abstract

PURPOSE:To improve reliability of shielded cable and at the same time perform the automation in manufacture of the shielded cable by retaining the both-end flat part of a flat cable in a line and forming its middle part in a rounded shape and nextly applying a braided shield to its periphery and then covering it with a sheathing tube. CONSTITUTION:The both-end flat part 1 of a flat cable 3 respectively having a flat part 1 at the end and a loose wire part 4 in the middle is retained in a line by a tension device and at the same time the middle part is taped in a rounded form. Nextly, a braided shield 13 is applied to the periphery by braiding and the manual arrangement of terminal cores is not required, so that a shielded cable without incorrect wirings is obtained. Thereby, the reliability of a cable is improved and at the same time the automation in manufacture of shielded cable may be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a shielded cable as a cable for equipment electric wires, which has flat portions at both ends and a round middle portion.

[Prior art] Between devices such as computers 3! ! As a connecting cable, a shielded cable (manufactured by Hitachi Cable Co., Ltd., MA cable) is known, in which the end of a round cable is flat-processed to enable connection to a peel-free pressure welding connector.

This shielded cable is manufactured by flattening both ends of a nine-gaple 40 having a cross section as shown in FIG.

Specifically, as shown in FIG. 9(a), first, a nine-gable cable 40 formed in advance is pulled out from the cable drum 41 and cut into a predetermined length using a cutter 42.

Next, the sheath 43 at both ends of the cut round cable 40 is
(FIG. 9(b)), and the braided shield 44 at the peeled portion is treated (FIG. 9(C)). Next, Fig. 9 (d
), a plurality of cores 45 are connected one by one to two array comb teeth 46, 46 . After arranging, these ends are placed in upper and lower molds 4 each having a heater 47° and 48°.
9,50'''C- fused, and as shown in FIGS. 6 and 8, a shielded cable 51 with flat processing applied to both ends is manufactured.In addition, in FIGS. , 52 is a fused cheese, 53 is a conductor, and 54 is an insulator.

[Problems to be Solved by the Invention] By the way, when flattening a terminal, the alignment of each core on the alignment comb teeth is done manually, which causes misalignment and lowers reliability.

Additionally, when attempting to automate the production of shielded cables, the braided shield processing process and core alignment process are obstacles to automation, so even if these processes could be automated, the equipment would be extremely expensive. Therefore, it is difficult to automate shielded cable manufacturing.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for manufacturing a shielded cable that eliminates the problems of the prior art described above, has high cable reliability, and can be easily automated.

[Means for Solving the Problems] In order to achieve the above object, a method for manufacturing a shielded cable according to the present invention includes a device for applying tension to flat portions at both ends of a flat cable having a flat portion at the terminal and a loose wire portion in the middle. While holding the shield in a straight line, the middle part is taped to form a round shape, a braided shield is then braided around the middle part, and the sheath tube is then covered with the braided shield.

Further, instead of applying the above-mentioned braided shield by braiding, a cylindrical shield braided article braided in advance to a predetermined size may be used, and the cable may be inserted into this shield braided article.

Further, as the sheath tube, a resin tube having a slit in the longitudinal direction is used, the slit part of this tube is pushed open, this is placed over the middle part of the cable, and the slit of this tube is fused. You can do it like this.

[Operation] By holding the flat parts of both ends of the co-flat cable in a straight line in the tensioning device, the cable is fixed in position, so the middle part can be formed into a round shape by taping, and the braided part can be formed into a round shape by taping. A shield and a sheath with a sheath tube are applied to produce an intermediate round shielded cable having flat portions at both ends. Therefore, it becomes unnecessary to manually arrange the terminal cores, and a shielded cable without wiring errors is manufactured, thereby increasing the reliability of the cable. Furthermore, since the work of arranging the cores is no longer necessary, it becomes easier to automate the manufacturing of the shielded cable.

In addition, the braided shield can be applied to the cable by using a cylindrical shield braided product that is pre-braided to predetermined dimensions and inserting the cable into this cylindrical braided product, which greatly improves the work efficiency. It is possible to improve.

Furthermore, the cable can be sheathed by using a resin tube with a slit, pushing open the slit part of the tube, covering the middle part of the cable, and fusing the slit of the tube. , can easily do cable sheathing. In addition, since it is only necessary to perform linear fusion in the longitudinal direction of the slit portion, the appearance of the cable after sheathing becomes almost uniform, thereby increasing the commercial value.

[Example code] Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the shielded cable manufacturing method of the present invention.

First, as shown in (a), a flat cable 3 is cut into a predetermined length using a cutting tool 2 such as a cutter or scissors so that both ends have flat portions 1. The flat cable 3
As shown in FIGS. 4 and 5, flat portions (welded portions) 1 are formed in advance at predetermined intervals with loose wire portions 4 between them. There are various types of flat cables to be used, but any type may be used, such as the twisted type or the blind type shown in Fig. 4. In Fig. 5, 6 indicates a conductor and I7 indicates an insulator.

Next, as shown in (b), the flat portions 1 at both ends of the cut flat cable 3 are held in this state, that is, in the flat state, by a pair of gripping portions 6a, 6b of a fixing jig 6, which can be attached and detached with bolts 5, etc. grip each one and fix it. These fixing jigs 6.6 are each supported by a support part 7.7, and one of the support parts 7 is connected to a tension applying device 8.
Since the cable 3 is supported by the elastic member 9 which is a main component of the cable 3, a predetermined tension is applied to the cable 3 fixed to the fixing jigs 6, 6, and the cable 3 is held in a straight line. As a result, the cable 3 is held and positioned in a straight line, and its intermediate portion can be rolled up with the tape 10, and a braided shield and sheath can be applied thereto.

Then, the middle part of the cable 3 held in a straight line (
The loose wire portions 4) are taped to form a round shape.

Next, as shown in (c), the arm shield 13 is applied by winding the braided conductor 12 from the Is group conductor winding bobbin 11 around the taped intermediate portion using a dedicated shield braiding machine.

Next, as shown in (d), one end of the cable 3 is removed from the fixing jig 6, and a cylindrical heat-shrinkable sheath tube 14 of a predetermined size is placed over the outer periphery of the cable 3 from this one end. After coating, one end of the cable 3 is gripped and fixed by the fixing jig 6 in the same manner as described above, and the cable 3 is held in a straight line. By increasing the wall thickness of the heat-shrinkable sheath tube 13, it can serve the same role as a conventional extruded type sheath. When covering a cable with a heat-shrinkable tube, if the tube cannot be covered because of a flat part of the cable, the flat part should be rolled up before covering the tube.

Then, using the hot air generator 15, the hot air from the hot air generator 15 is evenly applied to the entire heat shrinkable tube 14, and the tube 14 is shrunk to a specified dimension. The creation of a round shield couple is completed.

In this way, since a shielded cable is created using the flat cable 3 having the flat portions 1 at both ends,
There is no need to manually arrange the comb tooth tops for arranging the terminal cores, which was necessary in the past.

This makes it possible to manufacture shielded cables with no wiring errors, which increases the reliability of the cables and leads to improved quality. Further, since the work of arranging the terminal cores is not required and the m-group shielding process is not performed, the manufacturing of the shielded cable can be easily automated and costs can be reduced.

FIG. 2 shows a shield l#Jm process different from the shield braiding process shown in FIG. 1(c) described above.

First, using a dummy wire that has almost the same shape as the round cable after taping in Figure 1(b), a long braid is preformed around it using the same shield braiding machine as described above. As shown in (a), the wire is cut to a predetermined length Ll, the dummy wire 20 is extracted, and a cylindrical braided product 21 having an inner diameter (φ) of dl and a length is made.

Next, as shown in (b), the cylindrical braided product 21 is bush-packed to create a bushy-backed braided product 21a with an inner diameter (φ) of d2 (, >a+ > and a length of 2).

Next, as shown in (c), one end flat portion 23 of the cable 22 with its intermediate portion taped is rolled up so that it can be inserted into the bush pack braided product 2ia.

Then, the push pack braided product 21. After inserting into a, (d)
The braided shield 24 to the middle portion of the cable 22 is completed by stretching the bush pack, mm item 21a, to its original length Ll, as shown in FIG.

In this way, by inserting the cable 22 into the cylindrical braided product 21, the braided shield 24 can be easily applied, so that the workability is greatly improved.

That is, the cable obtained according to the present invention has a thickness of 0.3 to 3.
Most of the products are short lengths of about 0 m, so when braiding shields using a shield braiding machine, it is necessary to attach lead wires before and after the cables and to take time for setup (time required to braid the cables). Can be omitted.

Therefore, the work efficiency of the shield braiding process is improved, and this effect is particularly noticeable for short cables of about 2.0 m or less.

FIG. 3 shows a sheath process in which a resin tube 31 having a slit 30 in the longitudinal direction is used as the sheath tube in the sheath process of FIG. 1(d).

First, as shown in (a), a resin tube 31 of a predetermined length is formed, and a slit 30 is formed along its longitudinal direction.

Next, as shown in (b), the slit 30 portion of the tube 31 is pushed open so that the cable can be inserted, and the cable 33 with the flat portions 32 at both ends identified with the fixing jig 6. Cover the outer periphery of the middle part. Covered W
After I, hot air is sequentially blown from the jet heater nozzle 36 of the hot air generator 35 into the slit 30 portion of the tube 31 from one end to the other end. The hot air generator 35 is
A heater (not shown) is installed, and the air sucked from the air hose 37 is passed through the jet heater nozzle 36.
It is configured so that hot air with a narrow spread angle is blown from the tip of the tube 31.
The slit 30 can be completely melted and sealed.

Further, the hot air generator 35 is attached to the pole screw 38 so that its feed rate is accurately controlled.

As a result, the pole screw 38 is driven by the motor 39.
When the hot air generator 35 is moved through the jet heater nozzle 36, the hot air from the jet heater nozzle 36 is blown in a straight line. Thus, since the tube 31 (cable 33) is held in a straight line by the fixing jig 6, 6, etc., hot air can be blown from one end of the slit 30 portion to the other end.

Therefore, by blowing hot air onto the slit 30 portion, the slit 30 is completely melted and sealed, and the sheathing of the cable 33 with the resin tube 31 is completed.

In this way, by using the tube 31 with the slit 30 and pushing open the slit 30 portion of the tube 31, the tube 31 can be placed over the cable 33, reducing the trouble of removing the cable 33 from the fixing jigs 6, 6. This eliminates the trouble of reattaching it after removing it. In addition, in order to complete the sheathing of the tube 31 placed over the cable 33, it is only necessary to perform linear welding in the longitudinal direction of the slit 30 portion of the tube 31 whose outer diameter, surface condition, etc. are controlled in advance. , Cable 3 for other places
3. Since the tube 31 is the same as the controlled tube 31 before installation and is not subjected to hot air treatment, a uniform coating appearance is ensured. Therefore, the appearance of the cable after sheathing becomes almost uniform, increasing its commercial value. Furthermore, since cable sheathing can be easily performed with both ends 32 of cable 33 fixed to fixing jig 6.6, shielded cable production can be automated even more easily by using this sheathing process.

The present invention is not limited to the above-mentioned embodiments. First, instead of the shield braid, a single-sided aluminum laminated polyester tape is used, and if this tape is used as a tape to wrap the middle part of the cable, the shield braid process can be omitted. I can do it. Furthermore, as a method for sheathing the intermediate portion of the cable shown in FIG. 1(d), an injection molding method may be used instead of the method using a tube.

[Effects of the Invention 1 In summary, according to the present invention, the following excellent effects are exhibited.

(1) The flat parts at both ends of the flat cable are held in a straight line, the middle part is formed into a round shape, and then a braided shield is applied around this, and then a sheath tube is coated on this, so there is no possibility of incorrect wiring. This makes it possible to manufacture shielded cables with high reliability, and facilitates self-recommendation of shielded cable manufacturing.

(2) By using a cylindrical shield braided product that is pre-braided to a predetermined size, the braided shield for the cable can be easily worked.

(3) By using a resin tube with slits, the cable can be easily sheathed, and the appearance of the cable after sheathing becomes almost uniform, increasing the commercial value.

[Brief explanation of drawings]

FIG. 1 is a diagram showing one embodiment of the shielded cable manufacturing method of the present invention, FIG. 2 is a diagram showing another embodiment of the process of applying a braided shield in the shielded cable manufacturing method of the present invention, and FIG. 4 is a side view showing an example of a flat cable, and FIG. 5 is a view taken from the v-vsa arrow in FIG. 4. 6 is a diagram showing an example of a shielded cable, FIG. 7 is a sectional view taken along the line ■-■ in FIG. 6, and FIG. 8 is a cross-sectional view taken along the line ■-■ in FIG. The figure shows a tooth showing a conventional example. In the figure, 1 is a flat part, 3 is a flat cable, 4 is a loose wire part, 8 is a tensioning device, 13 is a braided shield, 14 is a sheath tube, 21 is a shield braided product, 3
0 indicates a slit, and 31 indicates a resin tube. Patent applicant: Hitachi Cable Co., Ltd. Patent attorney Nobuo Kinutani 74 ・Sheath suspension +, -7 (C) 7 (d) Figure 1 (a) 2. ...
shi・shi1゛cloudy sushi 1bo 1-(d) Figure 2 Figure 4 Figure 7 (a) (C) (d) Figure 9

Claims (1)

[Claims] 1. While holding the flat portions at both ends of a flat cable having a flat portion at the end and a loose wire portion in the middle in a straight line in a tensioning device, tape the intermediate portion to make it into a round shape. 1. A method for manufacturing a shielded cable, comprising: forming a shielded cable, then applying a braided shield around the shielded cable by braiding, and then covering the sheathed tube with a sheath tube. 2. Instead of applying the braided shield according to claim 1 by braiding, the shield according to claim 1 is obtained by using a cylindrical shield braided product that has been braided in advance to a predetermined size, and inserting a cable into this shield braided product. Cable manufacturing method. 3. As the sheath tube, a resin tube having a slit in the longitudinal direction is used, the slit part of this tube is pushed open, this is placed over the middle part of the cable, and the slit of the tube is fused. A method for manufacturing a shielded cable according to claim 1 or 2.