JPH0568311A - Stripper for covered wire - Google Patents

Abstract

PURPOSE:To remove only a covering layer precisely by linearly moving a pair of V-shaped blades arranged on both sides of a covered wire facing each other, and rotating the blades about its core after cutting the covering leaving the core. CONSTITUTION:A pair of blade fixing tables 15 and 16 are provided on a blade unit base 10. Screw holes 17 and 18 with female screw threads incised in the opposite directions are provided in the blade fixing tables 15 and 16. The direction of the male screw of a screw rod 19 which fits the screw holes 17 and 18 is reversed in the central section. The fixing tables 15 and 16 are moved in the horizontal direction by revolving a motor 22 on the base 10. V-shaped blades 24 and 25 fitted to the fixing tables 15 and 16 are set on both sides of the covered wire 6 located at a right angle to this paper, and moved to cut the covering. The amount of movement is set in accordance with the size of the wire. Then, remaining uncut sections are cut by swaying the blade unit base 10 by 45 deg. to either side. This removes the covering precisely without damaging the core.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for removing a coating layer of a coated electric wire, and more specifically, for crimping a crimp terminal for connection to an end of a coated electric wire in which a core wire is coated with an insulating layer. In a device for removing the coating layer at the end of the electric wire which is carried out in advance, the uncut portion of the coating layer is minimized by a pair of blades (so-called skin punch blades).

[0002]

2. Description of the Related Art Conventionally, a device for cutting a coated electric wire to a predetermined size and removing the coating layers on both ends of a cutting blade portion is shown in FIG. The blade unit 5 with the blades 3 and 4 attached covers the electric wire 6
They are placed facing each other vertically or horizontally with a pinch in between. During operation, the blade unit 5 is moved closer to cut the covered electric wire 6 by the pair of upper and lower cutting blades 2, and at the same time, the covering layer 7 of the covered electric wire 6 is formed by the pair of upper and lower blades 3 and 4 on both sides.
Is cut, and the cut coated electric wires 6 are moved backward relative to each other after the cut, and the cut coating layer 7 is cut during the movement.
With the cutting blade 1 and the cutting tool 2 sandwiched between the cutting blade 1 and the cutting tool 3, respectively, the uncut core wire 8 is pulled out to remove the coating layer 7 cut from the core wire 8. There is.

The coating removing blades 3 and 4 are usually shown in FIG.
As shown in 0, it consists of V blades cut at an acute angle θ, and these V blades are arranged so as to face each other in the diametrical direction of the covered electric wire 6, and are cut into the covered electric wire 6 so as to be rubbed together. The notch is formed on the entire circumference of the coating layer 7.

[0004]

The above-mentioned V-blade rubbing type has a problem that the cutting area with respect to the coating layer cross-sectional area of the blade greatly changes depending on the size and type of the coated electric wire. For example, when the core wire size is the same and the thickness of the coating layer changes, the cut area ratio becomes smaller and the cut residual area ratio becomes larger as the coating layer becomes thinner. Specifically, in the case of a coated wire having a core wire of 0.8 mm and a coating layer thickness of 0.45 mm, the coating layer has a V-cutting area ratio of 92.2% and a remaining cutting area ratio of 7.8% with respect to the entire cross-sectional area. For coated wire with core wire 0.8 mm and coating layer thickness 0.3 mm, cut area ratio 86.8%, remaining uncut area ratio 13.2%, core wire 0.8 mm, coating layer thickness 0.2 mm The ratio of the cut area is 62.0%, and the ratio of the remaining cut area is 38%. Further, when the thickness of the coating layer is the same and the core wire size changes, the larger the core wire size, the smaller the cut area ratio and the larger the cut residual area ratio.

As described above, since the cut area greatly changes depending on the size and type of the covered electric wire, the V
It is necessary to replace the blade according to the size and type of the covered electric wire, workability is poor, and it is necessary to prepare another type of blade, which causes problems in the number of parts and part management.

Even when the V-blade is replaced according to the size of the electric wire, as shown in FIG. 10, as the V-groove angle .theta. On the contrary, when the V groove angle θ is increased to, for example, θ = 90 ° as shown in FIG. 11, the uncut residue R2 on both sides increases.

Further, when the coating layer is thin, a sufficient cut depth ratio cannot be obtained, so that the cut area ratio is particularly small and the cut remaining area ratio is large.

[0008] As described above, when the remaining cut area is large, the coating layer is peeled off when the coating layer is removed by pulling out the electric wire, and in the worst case, the peeling is not performed. ..

The present invention has been made in view of the above problems, and even for a coated electric wire of a type in which the thickness of the coating layer is thin and the core diameter is large, the remaining uncut area ratio is apt to increase. The area ratio is 90% or more, in other words, the remaining cut area ratio can be 10% or less, and it is possible to cut electric wires of various sizes at an area ratio of the cut area ratio or more. Has a purpose.

[0010]

In order to achieve the above object, the present invention provides a V which is arranged to face a covered electric wire.
A pair of character-shaped blades, and the pair of blades are actuated close to each other toward the coated electric wire, and linear driving means for cutting the coating layer from both sides while leaving the core wire, and cutting after cutting with the blade by the linear driving means The present invention provides a coating layer removing device for a coated electric wire, which comprises a blade rotating means for rotating the blade in this state to cut the coating layer left uncut.

The pair of blades are V blades having a cutting angle of 90 degrees and a curved portion is provided at the apex thereof, and the pair of blades are rubbed by the linear driving means to cut the coating layer. The blade rotating means is preferably configured to rotate 45 degrees in the cut state.

[0012]

As described above, by rotating the coating layer in the circumferential direction of the electric wire with the pair of V blades being cut from both sides facing each other, that is, at the position where the V blade reaches the bottom dead center. , It is possible to cut the remaining notch at the both ends of the V blade and the apex of the V groove.

As described above, since the incision is made by the rotation after the incision by the V-blade, the portion left uncut by the rotation can be cut even when the V-blade has a large number of uncut portions. Therefore, it is not necessary to replace the V-blade according to the wire size, and the V-blade can be commonly used for other types of covered electric wires.

[0014]

The present invention will now be described in detail with reference to the embodiments shown in the drawings. The coating layer removing device shown in FIG. 1 supports a blade unit base 10 by a support shaft (not shown) so as to be rotatable in the direction of the arrow in the drawing.
The gear 11 is formed by making the lower end edge of the circular arc shape. A gear 12 meshing with the gear 11 is arranged at a lower portion of the blade unit base 10, and the gear 12 is rotated by a rotation driving means (not shown), so that the blade unit base 10 can be rotated horizontally as shown in the drawing. Arrow X1 from the state
It is set to rotate 45 degrees in the direction. Moreover, in order to guide the rotation of the blade unit base 10,
An arc-shaped guide groove 13 parallel to the gear forming arc surface is bored in the blade unit base 10, a guide pin 14 is inserted into the guide groove 13, and the guide groove 13 rotates along the guide pin 14. I am trying.

On the upper surface of the blade unit base 10 which is a horizontal surface, a pair of left and right blade fixing bases 15 and 1 in the drawing are provided.
6 are attached along the guide rail 26 so as to be linearly reciprocally movable in the directions of approaching and retracting from each other. These knife fixing bases 15 and 16 have screw holes 17 and
18 are formed so as to penetrate in the moving direction, and these screw holes 17,
A screw rod 19 is screwed on the screw 18. On the outer peripheral surface of the threaded rod 19, male threads 20 and 21 are formed so as to be separated from each other at the center as shown in the drawing, and the opposite directions of the male threads 20 and 21 are formed. , It is set to move backward by rotation in the other direction.

Both sides of the screw rod 19 are rotatably supported by bearings 23 fixed to the upper surface of the blade unit base 10, while one end of the screw rod 19 is protruded from the bearing 23 so that the upper end of the blade unit base 10 can be supported. It is connected to a linear drive motor 22 fixed to the section. Therefore, the motor 2
With two rotations, the blade fixing bases 15 and 16 are linearly moved to the retracted positions in the approach direction and the reverse direction indicated by the arrows.

V-shaped blades (hereinafter referred to as V blades) 24, 25 for removing a metal coating layer are provided on the blade fixing bases 15, 16 so as to project from upper wall surfaces facing each other. These V blades 24, 25 are positioned so as to rub against each other when the motor 22 is driven to move in a straight line.

Further, as shown in FIG. 2, the V blades 24 and 25 have the cutting angle θ of the V grooves 24a and 25a set to 90 degrees,
Moreover, the rounded portions 24b and 25b are provided at the tops of the grooves.

Further, the detection electrode 28 is connected to the one V blade 24 and attached to the blade fixing base 15, the detection electrode 28 is connected to a control device (not shown), and the V blade 24 is covered with an electric wire. When it cuts into the coating layer 7 of 6 and comes into contact with the core wire 8 made of a conductor, it is detected by the detection electrode 28, and this detection signal is output to the control device, and the control device stops the motor 22 to stop the linear movement. At the same time, the gear unit 12 is rotated to rotate the blade unit base 10.

Although not shown in FIG. 1, V
A cutting blade and a V blade for removing the coating layer having the same shape are provided on the same plane as the blades 24 and 25. That is, as in the case of FIG. 9, V blades, which are blades for removing the coating layer, are attached on both sides of the cutting blade. In addition, the V blades 24 arranged to face
A holding tool for holding both sides of the covered electric wire 6 in the longitudinal direction so that the covered electric wire 6 is located at the center of 25, and a means for pulling the coated electric wires 6 cut after the covered electric wire in a direction of retreating each other. It is provided.

Next, the operation of the above apparatus will be described with reference to FIG. First, as shown in FIG. 1, in the initial state in which the upper surface of the blade unit base 10 is held in a horizontal plane, the motor 22 is rotationally driven to rotate the screw rod 19 to move the blade fixing bases 15 and 16. Move linearly toward each other. Therefore, the V blades 24 and 25 attached to the tool fixing bases 15 and 16 are attached to the covered electric wire 6 as shown in FIG. Cut in.

The cut by the above linear movement is shown in FIG.
As shown in (b), the entire circumference of the coating layer 7 of the coated electric wire 6 is cut from both sides facing each other in the diametrical direction by rubbing the V blades 24 and 25 together. At that time, as shown in FIG.
Since the V blades 24 and 25 are 90 ° V blades, and the rounded portions 24b and 25b are provided at the tops of the V grooves, the cutting depth can be set to be large. Therefore, in the drawing, the V groove tops of the V grooves are shown. It is possible to reduce the cross-sectional area of the uncut portion R1 and the uncut portion R2 on both sides of the V blade.

The V blades 24 and 25 cut into the coating layer 7,
When the core wire 8 is brought into contact with the core wire 8, a current flows through the core wire 8 in advance, so that a current flows through the V-blade 24 and the detection electrode 28 detects it. By this detection operation, the motor 22 is stopped,
The V blades 24, 25 are stopped at the bottom dead center where they are closest to each other. Simultaneously with the stop of the motor 22, the gear 12 is rotated to rotate the blade unit base 10 by 45 ° in the arrow X1 direction.

When the blade unit base 10 is rotated, the blade fixing bases 15 and 16 and the V blades 24 and 25 are integrally formed as shown in FIG.
It rotates to the position shown by the dotted line. With this rotation,
As shown in (b), the V blades 24 and 25 rotate in the circumferential direction of the covered electric wire 6 to cut the uncut portions R1 and R2. Due to this rotary cut, the uncut portions R1 and R2 are almost completely cut in,
The portion of R3 shown in the figure is left slightly left.
That is, the uncut sectional area can be minimized.

The cut of the covered electric wire by the apparatus of the above-mentioned embodiment and the cut of the case where only the linear cut is made by using the same V blade (rounded at 90 °) and the rotary cut is not made The cross-sectional areas were compared.

That is, as shown in FIGS. 5 (a), 5 (b), 5 (c) and 5 (d), the coating layer 7 has a constant thickness of 0.3 mm and the core wire 8 has a size (a). 0.8mm, (b) 1.0mm, (c) 1.2mm, (d)
Conducted a comparative test on four types of coated electric wire 6 having a size of 1.5 mm.

The results of the above test are shown in the table of FIG. 6. When the rotary cut of the present invention is added, as shown by the line (I), the remaining cut is about 5% even in the worst condition (d). Met. On the other hand, as shown by the line (II) when only the conventional straight line is cut and no rotation is applied, as shown in the line (II), in the bad condition (d), the remaining cut reaches nearly 30%.

The cut area is a portion Y shown by hatching in FIG. 7, and the uncut area is a portion Z without hatching. In the figure, the core wire 8 is shown by a cross diagonal line.

The coating layer removing device according to the present invention is not limited to the embodiment shown in FIG. 1, but as shown in FIG.
The blade unit bases 10 'and 10' are fixed to the blades 5 and 16, respectively, and are divided into respective blade unit bases 10 'and 10'.
May be rotated by gears 11 ', 11'.
Since the other structure is the same as that of the apparatus in FIG. 1, the description is omitted.

[0030]

As is apparent from the above description, according to the coating layer removing apparatus of the present invention, the V blades are moved in a straight line so that the V blades are rubbed together, and then the V blades are rotated in this cut state. Then, since the portion left uncut by the above-mentioned linear movement is cut, it is not necessary to replace the V blade according to the size of the electric wire. Therefore, it is possible to improve workability and reduce the number of parts.

When a rotary cut is made by the present apparatus, the cut cross-sectional area can be averaged to 90% or more of the cross-sectional area of the entire coating layer. On the other hand, in the case where the conventional V-shaped blade shown in FIG. 10 is used for linear cutting, the average is 69.8%, and when 90 ° blade is linearly moved, the average is 78.1%. Is. in this way,
With this device, the cross-sectional area of cut can be greatly improved. In particular, when the most preferable 90 ° blade and a rotary cut with a radius are added, it becomes 95.6%, and the cut cross-sectional area can be dramatically improved.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a coating layer removing apparatus according to the present invention.

FIG. 2 is an enlarged view of a main part of a V blade in FIG.

3 (a), (b) and (c) are drawings showing an operation process of a V-blade.

4 (a) and 4 (b) are drawings showing a cutting operation for a covered electric wire.

5 (a), (b), (c), and (d) are cross-sectional views showing a covered electric wire used in a test.

FIG. 6 is a diagram showing test results.

FIG. 7 is a cross-sectional view showing a cut cross-sectional area and an uncut cross-sectional area of the coating layer of FIG.

FIG. 8 is a schematic front view showing another embodiment of the device according to the present invention.

FIG. 9 is a schematic front view of a conventional coating layer removing device for a coated electric wire.

FIG. 10 is a cross-sectional view showing an example of cutting with a conventional blade for removing a coating layer.

FIG. 11 Same as above

[Explanation of symbols]

 6 Coated Electric Wire 7 Coated Layer 8 Core Wire 10 Blade Unit / Base 11 Gear 12 Gears 15, 16 Blade Fixing Stand 17,18 Screw Hole 19 Screw Rod 22 Motor 24, 25 Coating Layer Removal Blade (V Blade)

Claims (2)

[Claims] 1. A V arranged to face a covered electric wire.
A pair of character-shaped blades, the pair of blades are operated in close proximity to each other toward the coated electric wire, linear driving means for cutting the coating layer from both sides leaving the core wire, and cutting after cutting with the blade by the driving means. A coating layer removing device for a coated electric wire, comprising: a blade rotating means for rotating the blade as it is to cut an insulating layer left uncut. 2. The pair of blades are V blades having a cutting angle of 90 degrees, and a curved portion is provided at the apex thereof, and the pair of blades are rubbed by the linear driving means to cut the coating layer. The coating layer removing apparatus according to claim 1, wherein the blade rotating means is configured to rotate 45 degrees in the cut state.