JPH0130362B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for stripping thin plastic-coated metal wires, such as plastic-coated strands for communication cables.

For example, plastic-coated wire for communication cables is generally made by extruding a foamed or non-foamed plastic layer of several tens to hundreds of microns on copper wire with a diameter of 0.4 to 0.9 mm, but in recent years, from the perspective of material recovery, If a manufacturing defect occurs, the copper wire and plastic coating are separated and recovered even from such thin wires. The conventional method is to pass the strands between a pair of pressure rolls to make two upper and lower slits in the coating by crushing, and then to pass through a peeling die. The stripping die has a through hole approximately equal to the outer diameter of the conductor, and only the conductor is inserted through the through hole to separate the conductor and the coating. However, this method has the following problems. That is, since the coating easily peels off from the conductor, handling is rather troublesome.

Since the sheathing is divided into left and right sides by two slits at the top and bottom, it is possible to ensure close contact between each sheath and the conductor (generally,
The conductor and sheathing are not bonded with adhesive, etc.
The surface area is less than half of the outer circumference of the conductor (the area is only in close contact with the conductor), and therefore, when a force such as vibration is applied to the running wire, each of the above-mentioned coatings will be peeled off from the conductor before reaching the stripping die. It hangs down from side to side and clings to various parts of the coating stripping device, making it impossible to collect the coating at a predetermined location, and also making it troublesome to remove the clinging coating.

Difficult to apply to somewhat thick or hard coatings.

If the coating is somewhat thick or hard, there is a limit because the slit cannot be made unless the coating is crushed with considerable force. If you try to force the slit, the conductor will become flat and deformed. It may even become difficult for the conductor to pass through the stripping die.

The coating stripping method for a thin plastic coated metal wire according to the present invention can solve the above-mentioned problems. A rectangular rod-shaped presser metal fitting is arranged such that the wire is wound around the surface of the free roll at a predetermined angle, one end of which is rotatably supported by a stand, and the direction from one end to the other end is in the direction of rotation of the free roll. A slit is made in the coating by pressing the coated metal wire on the surface of the free roll from the outside at the corner and rubbing the coated metal wire at the corner of the fitting, and then the slit of the coated metal wire with the slit is made. It is characterized by squeezing the sides with a fixed bar and then separating the coating from the metal wire. The present invention will be explained below with reference to the drawings.

FIG. 1 is a front view of one embodiment of the coating stripping device used in the present invention, and FIG.
A sectional view of part I is shown. The coating stripping method according to the present invention will be explained below with reference to FIGS. 1 and 2. In the figure, w is a coated metal wire fed out from a delivery bobbin (not shown), which passes through a V-groove guide roll 1 and is wound around the outer periphery of a free roll 2 at a predetermined angle. On the outer periphery of the free roll 2, a second
As shown in the figure, a groove 22 wider than the outer diameter of the coated metal wire w is provided. Reference numeral 4 denotes a flat bar-shaped presser metal fitting, which is rotatably supported on a stand 41 by a pin 42, and a spring 43 presses its tip end corner 44 against the surface of the coated metal wire w that is being wound around the free roll 2 and advances. be done. As a result, the metal-coated wire w is rubbed, and a slit s is formed in the coating i. 45 is a bolt for adjusting the pressing force. Metal fittings 4
As shown in FIG. 1, the wire is arranged so that the direction from one end supported by the pin 42 to the tip 44 is in the direction of rotation of the free roll, that is, in the direction of movement of the coated metal wire W. There is. The pressing angle (the angle between the lower surfaces of the metal fittings that hold down the tangential direction of the coated metal wire) is generally 20 to 50 degrees, preferably 30 degrees, although it depends on the type of wire to be treated. When α is less than 20°, it is difficult to form the slit s in the coating i, and on the other hand, when α is more than 50°, there is a risk that a thin wire will break. 3 is a fixed bar for squeezing the coated metal wire w provided with the slit s from the slit side. Through this training,
The width of the slit s is increased, and the coating i becomes slightly lifted from the core wire c, making it easy to peel off. 5 is fixed bar 3
This is a wire holder provided to prevent rotation of the coated metal wire w that has been squeezed, and a pin 52 is attached to the stand 51.
A weight 53, which is rotatable around , is placed on the line w, but this may be omitted. Respective stands 11 and 2 for guide roll 1, free roll 2, fixed bar 3, and presser foot 5
1, 31, 51 and the presser stand 41 are fixed on the common bed 6. 7 is a stripping die, and a through hole is provided between the upper and lower die members 71 and 72 through which only the core wire c of the coated metal wire w can pass, and the inlet side of the wire is provided with a through hole through which only the core wire c of the coated metal wire w can pass. It is designed to have an inclined surface so that it falls smoothly downward. Note that 73 is a static electricity removal brush fixed to the lower die member 72;
It contacts the coating i separated from the core wire c, and removes the static electricity charged on the coating i. This allows the covering i
is preferable because it does not adhere to the surface of the peeling die 7 and falls smoothly. The brush 73 is made up of a large number of carbon fibers arranged in a brush shape, and is used by arranging it so that the coating i comes into contact with the tip of the brush. For example, Toretek ES manufactured by Toray Industries, Inc. may be used. The core wire c from which the coating i has been removed is wound up by a winder (not shown), and the coating i is collected in the waste box 8. The thickness of the plastic coating to which the present invention can be applied depends on the type of plastic material, but is preferably about 0.1 to 1.5 mm.

The present invention is not limited to the above embodiments. For example, the groove provided on the outer periphery of the free roll 2 is V
It may be a groove or a round groove, as long as it can restrict the lateral movement of the line w with a certain width. In addition, the presser metal fitting 4 may be a cutting tool made of cemented carbide, in which only the tip may be convertible in consideration of wear due to abrasion. Furthermore, by winding the coating i in the same manner as the core wire c without using the stripping die 7,
The covering i and the core wire c may be separated. Furthermore, a large number of lines w may be arranged in parallel and processed simultaneously. It goes without saying that the present invention is useful for stripping not only electric wires but also other plastic-coated metal wires such as vinyl-coated iron wires.

Since the method for removing the coating according to the present invention is as described above, it has the following effects and can remove the coating extremely smoothly. That is, (1) A slit is made in the coating by pressing a presser metal fitting against the coated wire that is being wound on a free roll and moving forward, and by rubbing the surface of the coated metal wire with the corner of the metal fitting. A slit can be reliably made in the coating without applying a large pressing force that would deform the core wire.

(2) Only one slit is inserted into the sheathing, and even if the slit is inserted, the sheathing will still cover almost the entire circumference of the core wire, so the sheathed metal wire will not be strained or the wire will be subject to vibrations or other forces. Even when the core wire is worked, the coating does not peel off from the core wire during the process up to the stripping die, and therefore the coating can be collected all at once at a predetermined position after the stripping die, which is favorable for work.

(3) Since the coated metal wire that has been slit with the holding metal fitting is further squeezed by the fixed bar from the slit side, the slit can be reliably inserted even if the slit is not inserted properly with the temporary holding fitting. In addition, since the coating is squeezed after making a slit in the coating, the coating can be slightly lifted from the core wire, so the coating will not be peeled off from the core wire at the stripping die section and will clog the die hole and eventually break the core wire. No such problem arises.

Further, by using the method of the above embodiment, the following effects can also be achieved.

(4) Since the wire presser is placed after the fixed bar, the advancing wire does not rotate, and therefore the fixed bar can reliably squeeze the slit side of the wire.

(5) A static electricity removal brush is placed below the stripping die to remove static electricity from the coating, which prevents the coating separated from the core wire from clinging to the surface of the stripping die, which is convenient for work. .

[Brief explanation of drawings]

FIG. 1 is a front view of one embodiment of the coating stripping device used in the present invention, and FIG. 2 is a sectional view taken along line II in FIG. 1. In the figure, w...coated metal wire, i...coated, c...core wire, s...slit,
2... Free roll, 3... Fixed bar, 4... Presser fitting, 5... Line presser, 6... Common head, 7
...Peeling die, 73...Static electricity removal brush.

Claims (1)

[Claims] 1. In a method of stripping the coating from a thin plastic coated metal wire while continuously running the coated metal wire, the coated metal wire is wound around the surface of a free roll at a predetermined angle, one end of which is rotatably supported on a stand, and one end of the coated metal wire is rotatably supported on a stand. Press the coated metal wire on the surface of the free roll from the outside with a corner of a rectangular bar-shaped presser metal fitting arranged so that the direction from one end to the other end faces the rotation direction of the free roll, and press the coated metal wire on the surface of the free roll from the outside with the corner of the metal fitting. A thin-walled plastic characterized in that a slit is made in the coating by rubbing the coated metal wire, then the slit side of the slitted coated metal wire is squeezed with a fixed bar, and then the coating is separated from the metal wire. Method for stripping coated metal wire.