JPH0471310A - Method of stripping shielded wire - Google Patents

Abstract

PURPOSE:To facilitate a stripping work by providing two pairs of long end electrothermal strippers, intruding the longer stripper in thickness of a sheath, cutting the sheath and a shielding layer by the shorter stripper, intruding it to an insulating layer, and then pulling it. CONSTITUTION:Two pairs of long and short electrothermal strippers 22A, 22B and 23A, 23B are set at arms 21A, 21B at a desired interval. The strippers 22A, 22B and 23A, 23B respectively have opposite semicircular knife edges 24A, 24B and 25A, 25B, are conducted by a temperature controller via cords 26-29, and heated. The edges 24A, 24B are formed in length to intrude in thickness of the sheath of a cable, the edges 23A, 23B are set in length to melt the sheath, to cut the shielding layer and to melt the insulating layer. The cable is inserted between the arms 21A and 21B in a predetermined length from the right side of the drawing, the arms 21A, 21B are pressed, and pulled leftward. Thus, even a fine wire can easily be stripped off without damage.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for stripping a small-diameter shielded wire using an electrothermal wire stripper.

[Conventional technology]

FIG. 3 shows a diagram of the stepped peeling structure of a general shielded wire. In the figure, a shielded wire 1 consists of a conductor 2 made of tin-plated annealed copper wire, etc., a plastic insulating layer (hereinafter simply referred to as an insulating layer) 3, a shield made of horizontally wound annealed copper wire, metal foil, etc. A layer 4 and a plastic sheath (hereinafter simply referred to as a sheath) 5 are provided.

In recent years, ultra-fine coaxial wires have been used in medical equipment, etc., and these are shielded wires with the structure shown in Figure 3, in which the conductor 2 is used as the inner conductor and the shield layer 4 is used as the outer conductor. The inner diameter of 5 is 0.1868mm
, the inner diameter of the insulating layer 3 is extremely thin, 0.0762 mm. Both the insulating layer 3 and the sheath 5 are made of a fluororesin such as FEP (tetrafluoroethylene-hexapropylene copolymer resin) or PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether resin).

When removing the sheath 5, the shield layer and the insulating layer 3 and opening the thin shielded wire 1 into a striped state as shown in FIG. 1 in order to attach a terminal to the end thereof, scissors or the like are used. Alternatively, the plastic may be separated by heating and melting using an electrically heated wire stripper, which has recently been commercially available.

[Problems to be Solved by the Invention] Particularly when the insulating layer and sheath are removed manually using scissors or the like at the ends of the thin shielded wires as described above, the internal conductor or shielding layer may be damaged. Boxwood breakage is likely to occur. Furthermore, when removing a shielded wire whose insulating layer and sheath are made of plastic with similar melting points, if an electric wire stripper such as the one described above is used, the sheath is heated to melt and removed. In some cases, even the internal insulating layer melted, making it impossible to remove the necessary steps. Furthermore, even if the plastic of the insulating layer has a higher melting point than the plastic of the sheath, the sheath and the insulating layer must be removed in one step, each with a wire stripper whose heating temperature is adjusted, and the shielding layer must be removed in one step. It was necessary to cut and remove with scissors or the like, and the extraction work was time-consuming.

[Means to solve the problem]

The present invention has been made to solve the above-mentioned problems, and the outline thereof is to provide a shielded wire consisting of a conductor, an insulating layer, a shield layer, and a sheath in order from the inside, the melting point of the insulator being higher than that of the sheath. When cutting out the end of a wire whose temperature is higher than the melting point (for example, about 20°C), there are two advantages and disadvantages.
Using an electrically heated wire stripper that is structured in stages and has two hem bars each set at an appropriate temperature, use the longer stripper to cut into the sheath thickness.
This is a method of cutting the shield layer with a short stripper, digging into the insulating layer, and pulling the shield wire as if it were peeling, removing the sheath, shield layer, and insulating layer of the shield wire at the same time, exposing the wire. .

[Effect]

The present invention is directed to the case where the insulating layer is made of plastic having a higher melting point than the plastic forming the sheath, and the present invention is used to extract a small diameter shielded wire such as the one described above. Applying the extraction method of the present invention, advantages and disadvantages 2
After adjusting the temperature of the electric heating strippers installed in each step to the melting temperature of the plastic forming the sheath and insulating layer, inserting the wire into the stripper at a predetermined position, and pressing the wire between them, the longer end The wire stripper cuts in while melting only the sheath, and the shorter wire stripper melts the sheath, cuts the shield layer, and melts the insulating layer and bites in. Therefore, by pulling the shielded wire to one side using nippers, the knife of each stripper can be used to cut out the shielded wire in a stepped strip shape.

〔Example〕

In order to carry out the marking work of the shielded wire according to the present invention, as will be explained with reference to FIG. A shielded wire was prepared, on which a shielding layer 4 was applied and a sheath 5 was extruded and coated with FEP having a melting point of about 275°C.

FIG. 2 is a schematic diagram of the head portion of an embodiment of the electrothermal wire stripper used for cutting out the above-mentioned shielded wire. In the figure, arms 218 and 2 are shown, respectively.
A pair of long electric heated strippers 228, 2 at the tip of 1rl
2B and a pair of short electric heating strippers 238, 23B are formed. The electric heating strippers 228, 22B and 23A, 2311 are configured to face each other,
Two semicircular knife cores, 241'l and 258, 25B, are formed on the contact edges of each other, and when these electric heating heads are brought into contact, the wire insertion holes will be formed when they bite into the respective predetermined thicknesses. is starting to form.

26, 27, 2B and 29 are power cords. A control device for controlling the current is connected to the other ends of these power cords. Note that the electric heat stripper and its lead wires can be molded with a heat-resistant insulating material such as ceramics.

Furthermore, if the electric heating type wire stripper used in the present invention is constructed so that it can bite into the electric wire by a spring action, for example, like a stapler, the operation can be performed more easily.

When the above-mentioned electric heating type wire stripper was used to remove the shielded wire, the sheath, shield layer, and insulating layer were removed at the same time without damaging the internal insulating layer and conductor. It can be done easily.

〔Effect of the invention〕

If the opening work is performed using the shielded wire opening method according to the present invention, the sheath, the shield layer, and the insulating layer can be easily removed over the required length at the same time, resulting in extremely efficient opening work and work efficiency. ``Go'' 2.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the terminal portion of the shielded wire with the terminal exposed; FIG. 2 is a schematic diagram showing an example of an electric heating type wire stripper used in the 10-output method for shielded wire according to the present invention;
FIG. 3 is a stepped plan view for explaining the structure of a general shielded wire. 228, 22B, 238, 23B: Karonetsu Head, 24A, 24B, 258, 25B: Naifetsuji.

Claims (1)

[Claims] 1. When stripping the terminal part of a shielded wire consisting of a conductor, a plastic insulating layer, a shield layer, and a plastic sheath from the inside in sequence, use an electric heating wire stripper with a stripper configured in two stages, long and short.
The long stripper cuts into the sheath thickness, the short stripper cuts the shield layer and cuts into the insulation layer, and the electric heating stripper is pulled toward the end of the wire to remove the sheath, shield layer, and insulation layer of the shield wire. A shielded electric wire extraction method characterized by simultaneously removing and extraction.