JPH03214510A - Grounding wire and its manufacturing equipment - Google Patents

Abstract

PURPOSE:To form a casing sectionally in a crescent shape or in a flat trapezoid shape in an ideal shape after being extrusion molded around an insulated core for reducing a resin layer of the casing to the maximum allowable extent, by forming empty holes inside the casing on both sides of the insulated core. CONSTITUTION:A casing 2 sectionally in a crescent shape or in a flat trapezoid shape is provided around an insulated core 1, and empty holes 3 sectionally about in a triangular shape are formed ranging over the whole length in the longitudinal direction on both sides of the insulated core 1 of the casing 2, and the thickness of the casing 2 around these empty holes 3 is almost uniform. Thereby, the casing having an inside sectional shape of the crescent or the flat trapezoid is subjected to extrusion molding to be in the ideal shape while reducing a resin amount.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a grounding wire drawn out from various electrical devices on utility poles and an apparatus for manufacturing the same. [Prior art and its problems] As shown in Figs. 13 and 14, a grounding wire P' is pulled down from various electrical devices on a utility pole H, and the wire P' has a pipe shape or cross-section. A concave hard polyvinyl chloride (PVC) earth mold M is placed over it. In the case of a pipe shape, the electric wire P' is passed through the earth molding M and attached to the utility pole H. In the case of a concave cross section, the electric wire P' is attached to the utility pole H and grounded on top of it. A molding M was placed over the molding (Fig. 14), and the earth molding M was fastened with a steel band, etc. on both sides, and the work was complicated, and improvements were desired. For this reason, the present applicant proposed in Utility Application No. 101445/1983 that, as shown in FIG. We proposed a grounding wire P" which is provided with a protective sheath (outer covering) 2. This electric wire P'' is attached with the bottom side 2a of the cross section of the jacket 2 against the utility pole H.

However, the electric wire P rr of this invention has problems such as: ■ A large amount of resin is required to form the protective jacket 2; and ■ It is difficult to perform terminal/connection processing after peeling off the protective jacket 2. .

In addition, it is extremely difficult to extrude the wire P'' (sheath) of this invention.Specifically, the insulated core IllI1
has a circular cross section, while the outer sheath 2 has a flat trapezoidal or crescent cross-sectional shape, so the thickness of the outer sheath 2 that covers the insulated core wire 1 is equal to It is thin on both sides, and extremely thick on both sides. On the other hand, when manufacturing the electric wire P'', the conventional extrusion molding coating of the outer sheath 2 on the insulating core 11 is
As shown in Figure 2, a die 5 having a land 4 with a crescent-shaped or oblate trapezoid-shaped inner cross-section is attached to a die holder (not shown) in the crosshead (not shown) of an extrusion molding machine. , a nipple 6 is arranged in the die 5 so that a required resin flow B7 is formed between the surrounding dice 5, and the insulated core wire 1 is passed on the center line of the nipple 6, and the flow path 7 is This is done by supplying resin a.

Therefore, the difference in thickness between the upper and lower parts of the insulated core wire 1 of the outer sheath 2 and the thicknesses on both sides thereof occurs over almost the entire length of the flow path 7. In the part, the flow of resin a during outer jacket extrusion molding (inside resin flow path 7),
The degree of expansion (absolute amount) of the resin a after extrusion is extremely different, and even if the inner surface of the die land 4 is formed into the desired crescent or flat trapezoid shape, extrusion molding is not possible. In the outer sheath 2, as shown by the chain line in FIG. 11, no expansion of the resin a is observed in the vicinity of the insulated core wire 1;
! Since the thickness of the resin is large on both sides of the green core wire 10, there is a problem in that the resin a in those parts expands when released from the extrusion pressure and is not finished in a good shape. In the shape shown by the chain line in FIG. 11, the bottom surface 2a does not fit exactly along the surface of the utility pole H, which is not aesthetically pleasing, and it is also easy to tamper with by inserting a stick into the raised gap.

Therefore, in view of the above, in the present invention, the above-mentioned outer sheath having a crescent-shaped cross section or a flat trapezoidal cross section is made to have an ideal shape after extrusion molding around the insulated core wire, and the outer sheath is The objective is to reduce the amount of resin as much as possible and to provide an electric wire manufacturing device that has these advantages. [Means for Solving the Problems] In order to solve the above problems, the grounding wire according to the present invention has the following features in the wire shown in FIG.
The structure is such that holes are formed in the outer sheath on both sides of the insulated core wire.

In the manufacturing apparatus according to the present invention, in the above-mentioned apparatus for manufacturing grounding wires, when the nipple is attached to the die, the pair of insulated core wires and the inner surface of the die land have approximately the same gap. Resin flow suppressing blades having a triangular cross section are provided symmetrically with respect to the insulated core wire, and are configured to protrude from the front surface of the nipple toward the downstream side from the front end of the Guiland.

The above-mentioned resin flow suppressing blade may be formed with a longitudinal air supply hole opening at its tip, and the supply hole may be configured to communicate with the outside air through the nipple inner hole and the nipple holder inner hole. can.

When forming this air supply hole, the resin flow suppressing blades do not necessarily need to protrude from the die land. Further, an air supply jig communicating with the inner hole may be fitted to the rear end of the nipple holder, and an air supply source, dehumidification means, and constant pressure regulator may be attached to the jig.

A sizing die can be placed close to the downstream side of the extrusion molding die, and the sizing die has a land having the same axis and the same cross-sectional shape as the land of the extrusion molding die, and a cooling A pipe may be attached. Further, on the downstream side of the sizing die, a wire pulling machine from the sizing die and a fixed length cutting machine into which the wire from the drawing machine is continuously fed can be installed in order, and the fixed length cutting machine is It can have the following configuration.

A guide jig having a guide hole through which the electric wire from the pulling machine is fed is attached to the frame, and a cutting machine for cutting the running electric wire is provided on the frame at the latter stage of the jig in the electric wire penetration direction. , the downstream frame in the electric wire penetration direction of this cutting machine is provided with a U-shaped box rail with a downward, sideways, or sideways opening in the penetration direction, and the back surface of this box rail is aligned with the axis of the electric wire penetration direction. Along with being located above,
An electric wire retention means is provided at the opening of the box rail, and the cutting machine is provided with a means for moving the cutter in the direction of the opening of the guide jig when the electric wire passes through the through hole of the guide jig for a required length. Standard length cutting machine.

[Effect]

In the electric wire constructed in this manner, the thickness of the outer covering can be made substantially the same over the entire area due to the presence of the holes, and bulges do not occur on both sides of the insulated core wire.

Further, in the manufacturing apparatus, the pressure of the resin exiting the die is suppressed by the resin flow suppressing blades, and an electric wire having holes on both sides of the insulated core wire is manufactured. At this time, when air supply holes are formed in the resin flow suppressing blades, air smoothly flows into the holes through the holes.

In the case where a sizing die is provided, the extruded electric wire is cooled and hardened while being shaped by the die, resulting in a more ideal shape.

Further, if a pulling machine and a length cutting machine are provided, the electric wire from the sizing die is sent through the pulling machine to a guide jig of the regular length cutting machine, and advances within the box rail through the cutting machine. When the wire reaches the required length, the canoter moves and cuts the wire. At this time, since the electric wire is pushed toward the opening of the box rail, the cutting machine side of the electric wire in the box rail moves toward the opening, creating a space on the feeding axis of the electric wire. Therefore, the next wire sent in enters that space and advances while pushing the wire in front. This action is repeated, and the electric wire that has reached the opening in the box shaft strip is discharged downward from the opening.

〔Example〕

Ido Ushiko J Tomo 1N First, the grounding wire will be explained.

An example is shown in FIG. 1, in which 1 is vinyl chloride (PVC) (7)
The insulated core wire 1 is provided with a sheath 2 having a crescent-shaped cross section or a flat trapezoid shape. On both sides of the insulated core wire 1 of this jacket 2, holes 3 having a substantially triangular grafted surface are formed over the entire length, and the thickness of the jacket 2 around these holes 3 is approximately the same. It has become. Outer cover 2
Various known materials such as hard polyethylene (HDPE) and PVC can be used as the material.

This embodiment has the above-mentioned configuration, and is cut in advance to a total length of about 3.3 m in a factory, for example, and then placed in the hand of a passerby on the ground wire, which has been pulled down from the distribution line system, at the site, as in the past. Connect at a higher level than you can reach, and insulate the connection. Thereafter, the electric wire P is pulled down while applying the bottom side 2a of the sheath cross section to the surface of the telephone pole, and is tightened and fixed at appropriate intervals with a steel hand, and the lower end is connected to the ground rod.

l wisteria 1 remains 1 Next, an apparatus for manufacturing the electric wire P will be explained.

In this embodiment, as shown in FIG. 2, an insulated core wire 1 is sent from a sub-line A to an extrusion molding machine B, coated with an outer sheath 2 to form an electric wire P, and the electric wire P is passed through a sizing die C and a cooling bath. D, pulling machine E, and fixed-length cutting machine F to manufacture a fixed-length grounding wire P, and the process is as follows:
Controlled by control panel G.

As shown in FIG. 3, the extrusion molding machine B has a die holder DH of a cross hem CH of the extrusion molding machine with an inner cross-sectional shape of a crescent shape or a flat trapezoid shape.
An extrusion molding die 31 having a land 30 with a cross section of 1N is mounted. This die 31 is aligned by adjusting the screwing amount of bolts f placed at equal intervals around the periphery.

Inside the die 31 and the die holder DH, there is a nipple 32 through which the insulated core wire 1 passes through the center, and a nipple 32 is provided around the die 31.
and the die holder DH so that a required resin flow path 33 is formed between the die holder DH and the die holder DH.

This nipple 32 is screwed and fixed to the nipple holder NH, and the tip position of the nipple 32 is adjusted by adjusting the screwing amount of the bolt f of the nipple holder NH. Therefore, the size of the resin flow path 33 can be adjusted by moving the nipple 32 back and forth as indicated by the arrow a in the figure. and set accordingly.

A pair of resin flow suppression wings 34 having a triangular cross section as shown in FIG.
It has a gap t that is almost the same as the inner surface of the insulated core wire 1 and the die slant 30, and its tip protrudes downstream from the front end of the land 30. The protrusion amount b of the suppression blade 34 is determined by the temperature of the resin a,
It is set appropriately through experiments, taking into consideration extrusion pressure, etc. This setting is achieved by fitting the resin flow suppressing blades 34 into the nipple 32.
This can be done by making the blade 34 movable in the axial direction and only moving it in the axial direction, or by moving the nipple 32, which is integral with the blade 34, in the axial direction. The resin flow suppression blade 34 is formed with a longitudinal air supply hole 39 that opens at its tip.

An air supply jig 40 is attached to the rear end of the two-sable holder NHO.
The insulated core wire 1 is airtightly inserted into the Nimple holder NH and guided downstream through the inner hole 42 of the Nipple holder NH and the inner hole 43 of the Nisopul 42. The air supply jig 40 includes a constant pressure regulator 44.
, the combinator 4 via the dehumidifying air filter 45
6 is connected to the comb saucer 46, and air passes through the air supply jig 40, the Nisoburu holder inner hole 42, and the nipple inner hole 43 as shown by the arrow, and then enters the air supply hole 39.
The air is fed into the pores 3 of the jacket 2.

On the downstream side of the extrusion molding die 31, a sizing die C is arranged close to it. This die C has a land 36 coaxial and of the same cross-sectional shape as the land 30 of the die 31, and is also provided with a cooling pipe 37. Water at an appropriate temperature is flowing through the cooling pipe 37.
The dice C are cooled by this hot water. In addition, the land 36 contains a tetrafluorinated ethylene polymer (for example,
It is coated with DuPont (trade name: Teflon) 38, and this coating layer allows the wire P to move smoothly after extrusion.

This extrusion molding machine B has the above configuration, and now the take-off machine E
As shown in FIGS. 3 and 4, the insulated core wire 1 is fed onto the central axis of the nipple 32, and the resin a is supplied to the flow path 33. Similarly, the insulated core wire 1 is covered with an outer sheath 2 having a shape that crosses the inner surface of the land 30.

At this time, the pressure of the resin a that has exited the die 31 is suppressed by the resin flow suppressing blades 34, and furthermore, the resin a (sheathing 2) that has exited the die 31 has air sent into it through the feed hole 39. At the same time, the wire is cooled and hardened while being shaped with a sizing die C to obtain an electric wire P having a desired cross-sectional shape having holes 3 on both sides of an insulated core wire 1 shown in FIG.

The extrusion molding machine B shown in FIGS. 5 and 6 has an air supply hole 39
In this case, air is supplied to the hole 3 from the inner and outer surfaces of the tip of the nipple 32 through the inner hole 43 of the nipple 32. At this time, if the outer sheath 2 with the desired cross-sectional shape can be obtained without the resin flow suppressing blades 34 reaching the sizing die C, the length of the suppressing blades 34 (projection Amount b) may be short. The same applies to the resin flow suppressing blade 34 shown in FIG. 3 above.

The electric wire P formed by the extrusion molding machine B and the sizing die C as described above passes through the cooling tank D and is taken off by the take-off machine. That is, this drawing machine E has a well-known structure, and as mentioned above, by this drawing action, the insulated core wire 1 is fed from the supply A onto the central axis of the nino pull 32 of the extrusion molding machine B, and the insulated core wire 1 is fed into the extrusion molding machine B as described above. Molding is done.

The electric wire P pulled off by the pulling machine E is sent to a fixed length cutting machine F downstream. As shown in FIG. 8, this fixed length cutting machine F is provided with a rectangular box column 12 at one end of a machine base (equipment frame) 11 with an open outlet and inlet for the electric wire P, and an open portion of this rectangular box column 12. A cutting box 13 is attached to the base 12b on the inner surface of 12a.
is provided so as to be able to slide back and forth with respect to the path of the electric wire P (in the direction of the arrow).

A blade receiver 15 serving as a guide jig for receiving the electric wire P is fitted into the cutting box 13 on the upstream side of the path of the electric wire P so that the blade receiver 15 can be adjusted forward and backward by a clearance adjustment nut 18. still,
18a is a washer, 18b is a lock nut, and after adjusting the clearance between the blade 17 and the blade rest 15, which will be described later, the blade rest 15 is fixed with the lock nut 18b.

A square hole 13a is formed in the vertical direction of the center of the cutting box 13 to receive the blade support rod 14 in a slidable manner.

The blade support rod 14 has a shape shown in FIG. 10, and is fitted from the lower part of the square hole 13a, so that the lower protrusion 14a hits the lower surface of the cutting box 13 to prevent it from passing through.

When the blade support rod 14 is inserted into the cutting box 13, the bottle 19a is inserted into the pin hole 14b of the blade support rod 14, and the bottle 19a is inserted into the pin hole 14b of the blade support rod 14.
A toshigon spring 19 is interposed between both protruding ends of the cutting box 13 and the upper surface of the cutting box 13, and the blade support rod 14 is pulled up. A dovetail groove 14C is provided on the surface of the blade support rod 14 facing the blade receiver 15.
A blade 17 is fitted with a dovetail-shaped outer shape.

Note that 16 is an anvil.

On the downstream side of the cutting box 13, wire guide box rails 22 (hereinafter referred to as box rails) with a U-shaped cross section are installed in series, and the wires P are guided into the box rails 22 at appropriate intervals in the length direction. A spring 27 for retention is installed so as to sandwich the opening of the box rail 22. As shown in FIG. 9(a), on one end side of the inner surface of this box rail 22 (the side of the blade receiver 15 on the right side of FIG. 8), there is a distance r of the thickness of the electric wire P (see FIG. 1) from the back surface, as shown in FIG. 9(a). A rib 26 is provided, and this rib 26 allows
The electric wire P is prevented from returning upward when it is lowered by a blade 17, which will be described later. Further, a cutting length setting piece 25 is provided on the other end side of the box rail 22 so as to be movable and fixed in the length direction. When it is fed in and its tip hits the setting piece 25,
As the electric wire P advances, the box rail 22 and the cutting box 13 move. Note that 23 in the figure is a support roller for the box rail 22.

A cross stroke mechanism 21 is provided at the upper part of the square box column 12, and the hammer 20 is constantly reciprocated up and down by this mechanism 21. In the cross-stroke mechanism 21, an eccentric shaft 21C fixed to the central shaft 21a of the flywheel W which is constantly rotating is fitted into a hole in the slider 21b in the block 20a of the hammer 20, and the rotation of the eccentric shaft 21C As a result, the slider 21b moves laterally as shown by the chain line in FIG. 8, and also moves vertically to push down the block 20a, that is, the hammer 20. Therefore, when the upper surface of the anvil 16 faces below the hammer 20 (
8), its upper surface is struck by the hammer 20, the anvil 16, that is, the blade support rod 14 is lowered, and the electric wire P is cut.

This length cutting machine F has the above-mentioned configuration, and when starting work, first, as shown in FIGS. 9(a) and 9(b), electric wires P cut to a length in advance are filled in the box rail 22 and retained therein. This prevents the wire from being bent when the tip of the wire P to be fed next hits the cutting length setting piece 25.

From this state, the electric wire P is now transferred from the pulling machine E to the blade receiver 15.
When the electric wire P enters the box rail 22 and hits the cutting strip length setting piece 25, the wire P moves against the spring 24 through the setting piece 25 to move the box rail 22 and the cutting box 13 to the eighth
Move the figure to the left.

This movement is performed without bending the electric wire P because the outer sheath 2 is made of a hard resin. The amount of movement is a certain amount, i.e.
For example, when the length of the feed from the blade 17 is 3.3 m, the anvil 16 is positioned below the hammer 20 and is struck as shown by the chain line in the figure, the blade support rod 14 is pressed down, and the blade 17 and the blade holder are struck. 15, the electric wire P is cut to a regular length.

During this cutting, the blade 17 pushes the electric wire P downward, so that the cutting box 13 side of the electric wire P in the box rail 22 is lowered, and this state is maintained by the ribs 26, as shown in FIG. 9(a). A space S is created at the feeding level of the electric wire P. Therefore, after cutting, the spring 24 holds the box rail 22 and the cut box 13.
is restored, but at the same time the next electric wire P
enters the space S (shape ti of line tJ in Fig. 9(a)) and advances while pushing down the electric wire P in front. When this action is repeated, the electric wire P facing the lower opening of the box rail 22 is exposed to the claw 2 of the spring 27 from the opening. A is pushed open and the pieces are dispensed one by one into the machine stand 11 (the state shown by the chain line in Fig. 9).

In this fixed length cutting machine F, the cross stroke mechanism 21
Instead, a reciprocating drive machine such as an air cylinder or an electromagnetic plunger can be used.

Further, when the electric wire P is extruded with its long sides vertical (up and down), the length cutting machine F is set horizontally, the cross stroke mechanism 21 is set horizontally, and the opening of the box rail 22 is set horizontally. [Effects of the Invention] Since the grounding wire according to the present invention is constructed as described above and has holes formed in the outer sheath, its shape can be made to fit exactly along the utility pole. Therefore, it has a good appearance and is difficult to be tampered with. Furthermore, since there are pores, there is an effect of saving resin for the outer covering.

Moreover, the manufacturing apparatus according to the present invention has the advantage of being able to manufacture electric wires having such preferable shapes smoothly and without deformation.

Furthermore, if a pulling machine and a fixed-length cutting machine are installed, the wire can be cut to a fixed length.In this case, if the fixed-length cutting machine has a box rail, etc., the wire can be cut within the box rail. This means that the wires that have been removed are supported and removed as appropriate, and there is no need for people to be on hand all the time, resulting in cost reductions.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the grounding wire according to the present invention, FIG. 2 is a schematic diagram of an embodiment of the manufacturing apparatus of the same embodiment, and FIG. 3 is the extrusion molding machine of FIG. 2. , FIG. 4 is a perspective view of the Nisobl shown in FIG. 3, FIGS. 5 and 7 are schematic sectional views of other examples of the extrusion molding machine shown in FIG. 2, and FIG. FIG. 8 is a cutaway front view of essential parts of the fixed length cutting machine shown in FIG. 2, and FIG. 9 is a cutaway right side view of FIG. 8.
The same figure (a) is the A-A cross section, the same figure (b) is the B-B cross section, a main part sectional view of the conventional example of No. FIG. 14 is a sectional view taken along the line xx in FIG. 13. P: Grounding cable, M: Earth mall, H: Telephone pole, A
......Sublay, B...Extrusion machine, C...Sizing die, D...Cooling tank, E...Take-up machine,
F: Fixed length cutting machine, G: Control panel,
CH...Crosshead, DH...Dice holder NH...Nipple holder 1...Insulated core wire, 1a...Conductor, 1b... ...Insulating coating, 2...Outer covering,
2b...Retaining rib, 3...Vacancy, 4
...Dice land, 5...Dice, 6
...... Nipple, 11... Frame, 12... Square box pillar, 13... Cutting box, 14... Blade support rod, 15・・・・・・
Blade holder, 16...Anvil, 17...
...Blade, 18...Adjusting nut, 19...Torsion spring, 20...
... Hammer 21 ... Cross stroke mechanism, 22 ...
・・Box rail, 24・・・・Spring, 25・
...cutting length setting piece, 26...rib, 27...spring, 2? a...nail, 30...
・Dice land, 31...Dice, 32
... Nipple, 33 ... Resin flow path,
34...Resin flow suppression blade, 36...Sizing die land, 37...Cooling pipe, 39...Air supply hole, 40... ...Air supply jig, 42...Nipple holder inner hole, 43...
... Nipple inner hole, 44 ... Constant pressure regulator, 45 ... Dehumidifying air filter 46 ...
・Compressor 38...Coating,

Claims (9)

[Claims] (1) In a grounding wire P which is provided with a synthetic resin sheath 2 on an insulated core wire 1 and is arranged along the length direction of the surface of a utility pole H, the cross section of the sheath 2 is A grounding wire having a crescent or flattened trapezoid shape, the base 2a of which has an arc shape along the circumferential arc of the cross section of the utility pole H, and holes 3 formed on both sides of the insulated core wire 1. (2) Attach an extrusion molding die 31 having a land 30 with a crescent-shaped or flat trapezoid-shaped inner surface transverse shape to the crosshead CH of the extrusion molding machine B, and place the insulated core wire in the center inside the die 31. A nipple 32 through which the insulated core wire 1 passes is arranged so that a required resin flow path 33 is formed between the surrounding dice 31, and the nipple 32 has a nipple 32 that is substantially the same as the inner surface of the insulated core wire 1 and the die land 30. A pair of resin flow suppressing blades 34 having a triangular cross section with a gap t are attached to the insulated core wire 1.
2, and the resin flow suppressing blades 34 protrude downstream from the front end of the die land 30 from the front surface of the nipple 32. (3) Attach an extrusion molding die 31 having a land 30 with a crescent-shaped or flat trapezoid-shaped inner surface transverse shape to the crosshead CH of the extrusion molding machine B, and place the insulated core wire in the center inside the die 31. A nipple 32 through which the insulated core wire 1 passes is arranged so that a required resin flow path 33 is formed between the surrounding dice 31, and the nipple 32 has a nipple 32 that is substantially the same as the inner surface of the insulated core wire 1 and the die land 30. A pair of resin flow suppressing blades 34 having a triangular cross section with a gap t are attached to the insulated core wire 1.
A longitudinal air supply hole 39 is formed in the resin flow suppressing blade 34 and opens at its tip, and the air supply hole 39 is connected to the nipple inner hole 43 and the nipple holder inner hole 42. A manufacturing device for a grounding wire, which is characterized by being connected to the outside air through a wire. (4) The apparatus for producing an electric wire for grounding and pulling down according to claim (3), characterized in that resin flow suppressing wings 34 protrude from the front surface of the nipple 32 to the downstream side from the front end of the die land 30. Electric wire manufacturing equipment. (5) In the apparatus for manufacturing a grounding wire according to any one of claims (2) to (4), an air supply jig 40 that communicates with the inner hole 42 is attached to the rear end of the nipple holder NH. This jig 40 is equipped with an air supply source 46 and a dehumidifying means 4.
5 and a constant pressure regulator 44. (6) In the apparatus for manufacturing a grounding wire according to any one of claims (2) to (5), a sizing die C is disposed adjacent to the downstream side of the extrusion molding die 31; The sizing die C has a land 36 having the same axis and the same cross-sectional shape as the land 30 of the die 31, and a cooling pipe 37 is attached to the sizing die C. (7) The apparatus for manufacturing a grounding wire as claimed in claim (6), wherein the resin flow suppressing blade 34 extends into the land 36 of the sizing die C. (8) In the manufacturing apparatus according to claim (6) or (7), on the downstream side of the sizing die C, there is an electric wire pulling machine E from the sizing die C, and an electric wire P from the pulling machine E.
A manufacturing device for a grounding wire, which is equipped with a fixed length cutting machine F in which wires are continuously fed. (9) The apparatus for manufacturing a fixed length cutting machine for grounding wires according to claim (2), wherein the fixed length cutting machine F has the following configuration. A guide jig having a guide hole through which the electric wire P from the above-mentioned pulling machine E is fed is attached to the frame 11, and the running electric wire P is cut on the frame 11 at the latter stage of the electric wire passing direction of this jig. A cutting machine is provided, and the downstream frame 11 in the electrical wire penetration direction of this cutting machine is provided with a U-shaped box rail 22 in the penetration direction with a downward or sideways opening in cross section,
The back surface of this box rail 22 is located on the axis in the electric wire penetration direction, and the opening of the box rail 22 is provided with a retention means for the electric wire, and the cutting machine is provided with a through hole of the guide jig. When the wire passes through the required length, the cutter 17 is cut into the box rail 22.
A fixed length cutting machine comprising means for moving in the opening direction of the cutter.