JP2003032825A - Method and for stripping sheath of electric wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform sheath stripping of end processing, surely preventing damages of a conductor under a covering and cutting of a strand, even in the case of an electric wire whose core is eccentric or insulating covering has been deformed. SOLUTION: An inspection circuit 7 for electrically detecting that blades 4 made to cut into the covering of an electric wire (A) have touched its conductor under the covering, is added to a sheath stripping mechanism 1. Cutting-in of the blades 4 is stopped at a position where the blades have touched the conductor under the covering, and excessive cutting-in is prevented. Production of imperfect cut portions is prevented by repeating cutting at positions where the electric wire (A) and the blades 4 have been rotated relatively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stripping method and device for stripping a coating without damaging a coated lower conductor (a central conductor or a braided shield of a shielded cable) in terminal processing of a general insulated wire or a high voltage shielded cable. Regarding
In the following, the insulated wires and cables to be processed are collectively referred to as electric wires at the ends.

[0002]

2. Description of the Related Art For stripping an end of an electric wire, a fixing jig of a stripping machine holds the vicinity of the end of the electric wire at a processing center, and in this state, a pair of opposing blades (stripping blades) are cut into the electric wire. It is often done by cutting the coating (outer skin or inner insulator of shielded cable) into a sliced state and squeezing the coating cut with a closed blade.

[0003]

FIG. 6A shows a conductor a.
3 shows a general electric wire in which is covered with an insulator b. In addition, FIG.
(B) shows a shielded cable in which a conductor (a) is covered with an inner insulator (b) and the outer side thereof is covered with a braided shield wire (c) and an outer cover (d). The former peeling is performed on the insulator b, and the latter is performed on the outer cover d and the insulator b.

In these electric wires A manufactured through the steps of drawing, twisting and extruding, the concentricity between the core wire and the insulation coating depends on the alignment condition of the extruder, and the core is insulated from the insulation coating. Not a few lines are eccentric.

If the amount of eccentricity is large, the blade bites into the core wire when the electric wire is peeled off and the conductor under the coating is damaged,
If the bite is large, problems such as breakage of the conductor wire may occur.

An electric wire wound on a bobbin, a reel, or the like may be deformed due to a winding tendency to cause the insulation coating to be in the same condition as the eccentricity, and the above-mentioned problems also occur in such an electric wire.

In consideration of the eccentricity of the core wire, it is also possible to set the inner diameter of the blade to be larger than the outer diameter of the core wire to perform covering cutting. However, this method causes insufficient cutting and leaves unpeeling. Occurs. Further, even if such a method is adopted, if the eccentricity or the deformation is remarkable, the under-coated conductor may be damaged or the strands may be broken.

An object of the present invention is to enable peeling without causing the above problems.

[0009]

In order to solve the above problems, in the present invention, opposing blades are cut into an electric wire at a low speed. Then, the contact of the blade with the under-coated conductor is electrically detected, the cutting of the blade is stopped at the detection position, and the operation is repeated at a plurality of positions on the same circumference to cut the coating.

In order to carry out the method, a fixing jig for holding the electric wire at the processing center, a blade arranged oppositely for cutting the electric wire at a low speed, and a relative movement of the fixing jig and the blade in the longitudinal direction of the electric wire. Mechanism, an inspection circuit for electrically detecting that the blade contacts the under-cover conductor of the electric wire by using the under-cover conductor of the blade and the electric contact, and a stop command to the blade driving mechanism based on the contact detection signal. And a control circuit for outputting the electric wire.

This peeling device is provided with a mechanism for rotating the electric wire and the blade relative to each other, and the electric wire and the blade rotate relative to each other after the blade is cut, stopped and returned, and the blade is cut, stopped and returned at each position of relative rotation. It is preferable that a series of operations be repeated, or that a plurality of pairs of opposingly arranged blades be provided around the electric wire while changing the phase, and the coating cutting operation is sequentially performed by the blades of each group.

[0012]

According to the present invention, the contact of the blade with the under-cover conductor is detected by the presence or absence of electrical conduction, and the notch is stopped at the contact position, so that the blade is surely prevented from biting into the under-cover conductor. The lower conductor is not scratched or the strands are not broken.

If the cutting is stopped at the position where the blade comes into contact with the under-coated conductor, the coating cutting will be partially incomplete for the electric wire with the eccentric core wire and the electric wire with the deformed insulating coating. For this reason, cutting with a blade is performed at a plurality of locations on the same circumferential portion. In the case where the electric wire and the blade are rotated relative to each other and the case where a plurality of pairs of blades are provided, cutting at a plurality of positions can be carried out by an automated operation, and unpeeled residue due to incomplete cutting can be reliably prevented.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the peeling method and apparatus of the present invention will be described below with reference to FIGS. 1 to 5.

1 of FIG. 1 and FIG. 2 is a peeling device. This device 1 includes a positioning member 2 at the end of an electric wire shown in FIG. 2, a fixing jig 3 for centering the positioned electric wire A and holding it at the processing center, a pair of opposing blades 4, and a drive mechanism 5 for the blades. A slide mechanism 6 for relatively moving the fixing jig 3 and the blade 4 in the longitudinal direction of the electric wire, a circuit 7 for inspecting the presence or absence of contact between the lower conductor of the electric wire A and the blade 4 as electric contacts, and a driving mechanism 5. Control circuit 8 for controlling
have.

The positioning member 2 contacts the tip of the electric wire A to position it in the longitudinal direction, and at the same time supports the tip of the electric wire to center it at the processing center. When the tip of the electric wire A is abutted against the positioning member 2, an electric contact (not shown) provided on the member 2 comes into contact with the under-coated conductor of the electric wire.

Although the fixing jig 3 has been shown as the one that holds the electric wire A by the air chuck 3a, it is not limited to this.

The blade 4 is also of the rubbing type in the figure, but it may be replaced with a type of abutting blades having semi-circular blades butted at the processing center.

The drive mechanism 5 is a drive source 5 such as a servo motor.
The ball screw mechanism 5b is driven by a, and the pair of blades 4 are moved synchronously. The drive mechanism 5 can cut the blade 4 at a low speed and is sensitive to a stop command.

As the slide mechanism 6, the slider 6b guided by the linear way 6a is pushed and pulled by the actuator 6c such as an air cylinder to move the blade 4 together with the drive mechanism 5 in the longitudinal direction of the electric wire. 3 may be moved.

The inspection circuit 7 includes a power source 7a and a lamp 7b for confirming energization. When the circuit 7 is electrically conducted, a stop command is issued from the control circuit 8 to the blade drive mechanism 5. Flowing.

FIG. 3 shows a state before the blade 4 is cut into the electric wire A in peeling the shielded cable (FIG. 3A) and when the blade 4 is cut (FIG. 3B to FIG.
The state of (d)) is represented.

As shown in FIG. 3B, when the core wire of the electric wire is not eccentric with respect to the outer cover d, when it is eccentric as shown in FIG. 3C, the electric wire is as shown in FIG. 3D. Irrespective of the deformation, the circuit 7 is electrically conducted at a position where at least one of the blades 4 contacts the braided shield wire c, and the cutting is stopped. Therefore, the braided shield wire is not scratched or the strands are not broken due to excessive cuts. The same situation occurs when stripping the inner insulation of shielded cables and general electric wires.

Next, in the state of FIG. 3 (c) and FIG. 3 (d), the coating is not sufficiently cut, and if the coating is forcibly removed in this state, the uncut portion will be torn and the cut end will be cut. It may become dirty or may be left unpeeled.

Therefore, the blade is cut at a plurality of points on the same circumference to cut off the incompletely cut portion.

As a method therefor, as shown in FIG.
As shown in (b), a plurality of pairs of opposing blades 4 are provided around the electric wire A at different positions, and each pair of blades is
The method of sequentially operating the cutting, stopping, and returning operations is adopted. Alternatively, the electric wire and the blade are rotated relative to each other, and several points are cut by one set of the blade.

FIG. 5 shows an example of the rotating mechanism 9 for rotating the electric wire and the blade relative to each other. This mechanism 9 is provided with a geared ring 9b supported by a guide roller 9a, the blade 4 and a drive mechanism 5 for each blade are attached to the geared ring 9b, and a geared ring 9b is attached by a geared motor 9c.
Is rotated on the processing center to shift the cutting point of the blade 4. Instead of revolving the blade 4, the fixing jig 3 may be attached to a rotating body whose rotation center is the processing center and rotated, and this also achieves the same purpose as the mechanism of FIG.
These mechanisms only need to have one set of blades, and it is easy to reduce the cost of the device. Further, the cutting position and the number of cuts of the blade can be freely set by adjusting the relative rotation angle, and the stripping of the thick electric wire, which has to cut the coating in several times, can be performed without any problem.

Since the number of cuts for reliable cutting varies depending on the wire diameter, the state of the wire, etc., a basic cutting experiment is conducted to set an appropriate number.

[0029]

As described above, in the method and apparatus of the present invention, it is detected that the blade comes into contact with the under-coated conductor and the cutting is stopped at that position. It can prevent breakage.

Further, by cutting the blades at a plurality of positions on the same circumference to eliminate the eccentricity of the core wire and the incomplete cut portion due to the deformation of the electric wire, unpeeling of the coating is prevented, and the reliability of the peeling is improved. The effect of improvement and product quality improvement can be obtained.

[Brief description of drawings]

FIG. 1 is a front view showing an example of an apparatus of the present invention.

FIG. 2 is a vertical cross-sectional view showing an outline of the same device.

FIG. 3A is a diagram showing a state before cutting a blade, and FIG. 3B is a diagram showing a state in which a blade is cut into an electric wire whose core wire is not eccentric and stopped. FIG. 3C is an electric wire whose core wire is eccentric. The figure which shows the state which the blade cut into and stopped. (D) The figure which shows the state which the blade cut into the deformed electric wire and stopped.

FIG. 4A is a diagram showing an example in which two sets of blades are provided. (B) A diagram showing an example in which three sets of blades are provided.

FIG. 5 is a front view showing an example of a blade rotation mechanism.

FIG. 6 (a) Structural diagram of a general electric wire (B) Structural diagram of shielded cable

[Explanation of symbols]

1 peeling device 2 Positioning member 3 Fixing jig 4 blades 5 Blade drive mechanism 6 Slide mechanism 7 inspection circuit 8 control circuit 9 Blade rotation mechanism A electric wire a conductor b insulator c braided shielded wire d outer skin

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshiaki Suzuki             1-7-10 Kikuzumi, Minami-ku, Nagoya-shi Stock Association             Auto Network Technology Laboratory F-term (reference) 3C024 BB02 EE04 KK01                 3C027 JJ01 JJ03 JJ09                 5G353 AB01 AB07 AC06 CA02 DA02                       DA03 EA11

Claims (4)

[Claims] 1. A method for stripping an electric wire in which a blade disposed oppositely is cut into an electric wire held at a processing center, and the coating of the end portion is cut into a circular slice by the blade to remove the electric wire, and the blade is cut at a low speed. It is possible to cut the coating by stopping the cutting of the blade at the detection position by electrically detecting that the blade has come into contact with the conductor below the coating and repeating the operation at multiple points on the same circumference. Characterizing method of stripping electric wires. 2. A fixing jig for holding an electric wire in a processing center,
The opposing blades that cut into the electric wire at low speed, the mechanism that relatively moves the fixing jig and the blade in the longitudinal direction of the electric wire, and the blade and the covered lower conductor of the electric wire serve as electrical contacts, and the blade becomes the covered lower conductor of the electric wire. An electric wire stripping device comprising: an inspection circuit that electrically detects a contact, and a control circuit that issues a stop command to a blade drive mechanism based on a contact detection signal. 3. A mechanism for rotating an electric wire and a blade relative to each other, wherein the electric wire and the blade rotate relative to each other after cutting, stopping and returning of the blade, and a series of operations of cutting, stopping and returning the blade at each position of relative rotation. The stripping device for an electric wire according to claim 2, wherein the stripping device is repeated. 4. The wire stripping device according to claim 2, wherein a plurality of blades arranged opposite to each other are provided around the electric wire with different phases, and the coating cutting operation is performed in order by the blades of each pair.