JP2000350324A - Stripping device for electric wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To strip a covering part off properly and perform twisting for a core part whose covering part has been stripped off to be exposed by an easy means. SOLUTION: This stripping device is provided with a cutter whose facing blade points approach or separate each other and which forms a cut in the covering part of an electric wire W, a cutter holder 2 rotatable around the axial line passing through the electric wire W serving as a virtual axis, and a means of reciprocating a holder 2 in the lengthwise direction of the electric wire W. The facing blade points approach each other to form a cut in the covering part of an electric wire end, in the condition of which, the cutter holder 2 moves in such a direction as to separate from the electric wire W.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire stripping device for forming a cut in a sheath of an electric wire and peeling the sheath.

[0002]

2. Description of the Related Art For example, when manufacturing a lead wire used for connection between electric components, a wire stripping device is configured to stretch a coated wire wound on a bobbin in advance and cut it to a predetermined size in a fixed size. It is used to strip off the coating on the end of the wire cut to a predetermined size. The electric wire with the end covered and the core wire exposed is sent to a downstream soldering step or the like.

[0003] In many cases, a core wire of a covered electric wire is formed by bundling a plurality of conductive wires, and a twisting process is performed on the core wire portion in order to prevent the exposed core wire from being removed by removing the covering portion. May be performed. Conventional twisting equipment is
Having opposed twisting files, making a cut in the coating at the end of the wire, separating it from the residual coating, and holding the separated coating so that it does not fall off the core, with the file in different directions Was to slide. Such an electric wire twisting apparatus is disclosed in, for example, Japanese Utility Model Laid-Open No. 5-78122.
Issue. However, this method requires two means, namely, a means for making a cut in the sheath of the electric wire and a twisting means, that is, two steps.

Further, the conventional electric wire stripping apparatus has a pair of V-shaped cutters disposed opposite to the coated electric wire, and the blade edge of the cutter is operated close to the coated electric wire. The sheath is cut off from both sides while leaving the core wire, and in this state, the cutter is moved in the length direction of the electric wire to peel off the sheath.

However, in a conventional V-shaped cutter, a pair of cutting edges are formed in a stepped shape like a so-called scissors. When the wire is moved in the length direction, the force acting on the wire differs depending on the side of each blade, and the wire is twisted during stripping of the wire (see FIG. 1), and there is a fear that the core wire may be cut.

In particular, recently, with the miniaturization, weight reduction, and integration of electric appliances, the need for ultra-fine electric wires such as AWG Nos. 36 and 38 has been increasing. In such a case, stripping of such an extremely thin electric wire would result in a broken core wire.

[0007]

SUMMARY OF THE INVENTION It is a first object of the present invention to satisfactorily peel off a covering portion and to twist the exposed core portion by a simple means. It is in.

[0008] A second object of the present invention is to provide a strip device that does not cause a core wire break even for an extremely fine electric wire, for example.

[0009]

Means for Solving the Problems In order to achieve the first object, the technical means employed by the present invention is such that opposing cutting edges can approach and separate from each other, and a cut is made in a covering portion of an electric wire. A cutter and, mounted with the cutter, are rotatable about an axis passing through the electric wire as a virtual axis,
It has a cutter holder that can reciprocate in the length direction of the electric wire, and the opposing cutting edges approach to make a cut in the covering portion of the end of the electric wire, and in this state, the cutter holder rotates, It is configured to move in a direction away from the electric wire. With the cutting edge cut into the sheath of the wire, the cutting edge moves in the length direction of the wire and in the direction away from the wire while rotating in the circumferential direction of the sheath, thereby twisting the core at the same time as stripping the sheath. Processing can be performed. This utilizes friction between the blade edge and the covering portion, and friction between the stripped covering portion and the core wire.

The moving means of the opposed cutting edge is mechanically performed in the embodiment, but is preferably selected from other known means, for example, using an electric motor. In the embodiment, the rotation means of the holder is also performed via a plurality of transmission mechanisms, but may be directly rotated by an electric motor, for example. In the embodiment, the means for reciprocating the holder is also performed by using a cam and a spring.However, the invention is not limited to this.Electric motors, cylinders, cams, and the like can be used alone or in combination. It can be suitably selected. Further, in the embodiment, the driving means for urging the opposing cutting edges in a direction in which the cutting edges approach each other and moving the cutting edges in the separating direction is shown. May be provided with a driving means for urging them in a direction to separate them and moving them in a direction to approach them.

[0011] The second object is achieved, in particular, by the technical means according to claim 3 or 4. According to a fourth aspect, the four blades described in the third aspect are constituted by two blades, and the shape of the blade edge as a whole is substantially the same. Since the opposing cutting edges are located on the same plane, a notch can be made evenly symmetrically with respect to the covering part of the electric wire, and when moving the cutting edge with the cutting edge cut into the covering part ,
Since the force acts evenly on the electric wire, it is possible to prevent the electric wire from being twisted as much as possible. Therefore, it is possible to satisfactorily peel off the covering portion without breaking the core wire. This configuration is extremely advantageous when twisting the exposed core wire.

[0012]

Embodiments of the present invention will be described with reference to the drawings. FIG. 2 is a sectional view (partially expanded) of the strip device. The stripping device includes a cutter holder 2 on which a strip cutter unit 1 is mounted.
The holder 2 is rotatable in a horizontal direction (a direction orthogonal to the length direction of the wire W extending vertically). The holder 2 is configured to be able to reciprocate up and down (the direction in which the electric wire W extends). In the one shown,
The electric wire W is supplied to the strip device in a posture extending in the vertical direction, and the holder 2 is freely rotatable in the horizontal direction and movable in the vertical direction. If the electric wire extends in the left-right direction, the holder is configured to be rotatable in the vertical direction and movable in the left-right direction.

The holder 2 includes a cylindrical portion 3 and a cylindrical portion 3.
And a cutter mounting portion 4 integrally formed above the upper portion. The cutter mounting portion 4 has a rectangular plate-shaped horizontal portion 5 and a pair of side walls 6 formed in a rising shape facing both ends of the horizontal portion 5. The central part of the horizontal part 5 is open and communicates with the hollow part of the cylindrical part 3.

Between the opposing side walls 6, two slide pins 7 for linear sliding are provided in parallel. An insertion hole through which the pin 7 is inserted is formed in the two moving blocks 8, and the two opposing moving blocks 8 are slidable in the length direction with respect to the pin 7. Blades A, B, C, D constituting the cutter unit 1 are provided on the moving block 8.
, Which will be described later.

A spring 9 is interposed between the moving block 8 and the side wall 6, and the spring 9 acts to push out the moving block 8, so that the opposing moving blocks 8 are moved in a direction approaching each other. It is energizing. A bearing 10 is mounted below the facing surface of the moving block 8, and when the bearing 10 contacts the stopper 11, the movement of the moving block 8 in the approaching direction is restricted.

The stopper 11 has a tapered contact surface whose diameter decreases upward, and is movable up and down. Therefore, when the stopper 11 is forcibly moved downward in a state where the bearing 10 and the peripheral surface of the stopper 11 are in contact with each other, the moving blocks 8 move toward each other by the spring force of the spring 9. The means for vertically moving the stopper 11 and the fine adjustment means will be described later.

On the upper surface of the moving block 8, a shallow recess 80 extending in the moving direction of the moving block 8 (the length direction of the pin 7) is formed.
Are configured to receive the blade bodies A, B, C, and D. Blade bodies A, B, C and D have cutting edges A4, B4 and C
4 and D4 are attached to the respective moving blocks 8 such that they face each other. By moving the opposing moving blocks 8 closer to or away from each other, the distance between the opposing cutting edges changes. In the drawing, reference numeral 12 denotes a cutter clamper mounted on the upper surface of the moving block 8 so as to press the cutter unit 1 from above.

FIG. 5 is a plan view and a side view of the stripping blade according to the present invention, and is composed of four blades A, B, C, and D in total. The stripping blades are two blades A and B,
The cutter unit 1 is formed by superposing C and D, and the cutter unit 1 is arranged to face each other. The configuration of the blade body will be described by taking the blade body A as an example.
It has a thin-walled, short, flat plate-shaped main body having a front surface A1 and a back surface A2, and one end in the length direction is a bevel extending to 45 degrees, and the front side of the bevel is a slope A3. By doing so, the cutting edge A4 is formed. The other blade bodies B, C, and D have the same configuration, and are denoted by the same reference numerals. Here, the side on which the inclined surface forming the cutting edge is formed is referred to as a surface for convenience.

One cutter unit 1 is composed of two blades A and B. The blades A4 and B4 are perpendicular to each other, and the back surfaces A2 and B2 are in close contact with each other.
Two blades A and B so that the four blades 4 are located on the same plane.
Are formed by polymerizing. Similarly, the other cutter unit 1 is composed of two blades C and D, the blades C4 and D4 are made orthogonal to each other, the back surfaces C2 and D2 are brought into close contact with each other, and the blades C4 and D4 are flush with each other. It is formed by superimposing two blades C and D so as to be positioned above.

The stripping blade is composed of two sets of cutter units 1
Are arranged facing each other so that the opposed blade edges A4, B4, C4, and D4 are located on the same plane. When the cutter units 1 configured as described above move in a direction approaching each other, the opposed blade bodies A and C, and B and D can overlap while the back surfaces A2 and C2 and B2 and D2 are in sliding contact with each other.

The cutting edges A4, B4, C of the cutter unit 1
When 4, D4 is cut into the covering portion C of the electric wire W from a direction perpendicular to the length direction of the electric wire W, as shown in the figure, it is in a state of being cut evenly from four sides. That is, the cutting edges A4, B4, C4, D4 are respectively on the same plane, and the inclined surfaces B3, C3 of the cutting edges B4, C4 facing in parallel are lower than the cutting edges, and the cutting edges A4 facing in parallel, The inclined surfaces A3 and D3 of D4 are located above the cutting edge. In such a cut state, the cutter unit 1 is moved in the length direction of the electric wire W (for example, downward in the figure).
In this case, a more uniform force acts on the electric wire W. In particular, this configuration has a remarkable effect when the cutter unit 1 moves in the length direction of the electric wire W while rotating.

The hollow portion of the cylindrical portion 3 is provided with a release coating recovery pipe 13 extending vertically, and the upper end of the recovery pipe 13 extends to the cutter mounting portion 4 of the holder 2. , The opening at the upper end faces the lower part of the cutter unit 1. A stopper 11 is mounted on an outer peripheral surface of an upper portion of the collection pipe 13. The stopper 11 includes an upper half portion having a tapered shape and a lower half portion having a cylindrical shape. The lower half portion is located in the hollow portion of the cylindrical portion 3, and the upper half portion has a space between the opposed side walls 6. Is facing.
The lower end side of the collection pipe 13 extends below the cylindrical portion 3.

A vertically movable piston rod 14 is interposed between the inner wall surface of the cylindrical portion 3 and the outer wall surface of the collection pipe 13. The upper end of the piston rod 14 is in contact with the stopper 11 from below, and when the piston rod 14 moves up and down with respect to the collection pipe 13, the stopper 11 moves up and down and the opposed cutting edges A4 and B
4, the distance between C4 and D4 changes. A spring collar 15 is provided below the piston rod 14,
A spring 16 is interposed between the piston rod 14 and the spring collar 15. Piston rod 14
Is constantly urged upward by a spring 16. Therefore, the stopper 11 is in a state of being moved upward, and the opposing cutting edges are in a state of being further separated. In addition, the piston rod 14 is the recovery pipe 1
3, it can be moved up and down,
The recovery pipe 13 also functions as a guide support for the piston rod 14.

An air chamber 18 closed by two O-rings 17 is formed between the cylindrical portion 3 and the piston rod 14. By injecting air into the air chamber 18, the piston rod 14 is It is forcibly moved downward against the force.

An adjusting screw 19 is provided inside the spring collar 15, and a lower half portion of the adjusting screw 19 is screwed to a screw nut 20. The spring collar 15 and the nut 20 are fixed, and when the adjusting screw 19 is rotated, the piston rod 1
4 is slightly moved up and down to finely adjust the position of the stopper 11.

Below the nut 20, a dust nozzle 21 is provided.
Are rotatably mounted, and a vacuum hose (not shown) is mounted on the dust nozzle 21. When the holder 2 rotates, the stopper 11, the collar 15, and the nut 20 rotate integrally. The piston rod 14
It has a floating shape. Since the dust nozzle 21 is rotatable, the hose is not twisted with the rotation of the holder 2.

The cylindrical portion 3 of the holder 2 is rotatably mounted on a rectangular parallelepiped housing 22. Two large and small holes 22a, 2
2b is formed. The cylindrical portion 3 of the holder 2 is rotatably mounted on one of the holes 22a via a bearing. The lower portion of the cylindrical portion 3 protrudes below the lower surface of the housing 22, and a spindle gear 23 is fitted on the protruding portion.

A hole 22a is formed in the wall of the housing 22.
An air supply hole 24 extending toward is formed.
It is in fluid communication with an air blowing hole 25 penetrating the wall of the cylindrical portion 3 of the holder. In the illustrated example, the perforated portion 2
A ring-shaped air chamber 180 is formed between the wall surface of 2 a and the outer wall of the cylindrical portion 3, and the air chambers 18 and 180 are communicated with each other through a blowing hole 25. Thus, the air introduced from the air supply hole 24 is supplied to the air chamber 18.

The other hole 22b formed in the housing 22
, A twister shaft 26 is rotatably mounted. A clutch gear 27 is mounted on the twister shaft 26 via a one-way clutch, and the clutch gear 27 and the spindle gear 23 are engaged. The lower portion of the twister shaft 26 projects below the lower surface of the housing 22, and a clutch bevel gear 28 is mounted on the projecting portion. Clutch bevel gear 2
8 is supported by a bevel gear support 280.

One side wall of the housing 22 (the side on which the twister shaft 26 is mounted) is fixed to an upper portion of a plate-like base 29 erected vertically. Base 29
A shaft 30 extending in the horizontal direction extends through a lower portion of the shaft 30. An actuator bevel gear 31 is mounted on the shaft 30. The bevel gear 28 and the bevel gear 31 are meshed so as to be able to transmit. A cam 32 is mounted on the tip of the shaft 30. The configuration of the cam 32 will be described later.

The other side wall of the housing 22 (the rear side when viewed from the front, which is shown in an unfolded manner) is fixed to a plate 33 extending vertically, and the plate 33 is mounted on a sliding unit. ing. The sliding unit includes two slide shafts 34 extending in the vertical direction, and a slide 35 that slides up and down along the slide shafts 34. A spring (not shown) is provided between the two slide shafts.
Are always urged upward. When the sliding body 35 moves up and down, the entire strip unit including the holder 2 moves up and down.

A lever 36 is swingably mounted on a fixed plate (not shown) on the electric wire processing apparatus main body side, and the cam 32 is connected to the lever 36. The cam 32 is a disk-shaped eccentric cam having a desired thickness. Lever 36
The outer peripheral surface of the cam 32, which forms the peripheral edge of the cam 32, is formed so that the diameter from the center becomes gradually larger, and is formed by connecting the starting end and the terminal end by a notched edge at one round.
The end of the shaft 30 is connected to the center of the cam 32, and when the shaft 30 rotates, the cam 32 rotates.

When the cam 32 rotates, the outer peripheral edge of the cam 32 rotates while sliding on the lever 36 mounted on the fixed plate, and the strip unit moves downward against the force of the spring. When the cam 32 makes one rotation, it reaches the notch edge of the cam 32, so that the outer edge of the cam 32 and the lever 36
And the strip unit moves upward by the force of the spring. Lever 3 for plate
The mounting portion 6 is variable, and by changing the mounting portion of the lever 36, the amount of downward movement of the strip unit can be selected. In the embodiment, since the holder 2 rotates at a constant speed, the amount of twist can be changed by changing the descending distance of the holder 2.

A description will now be given of an electric wire stripping process performed by the stripping apparatus configured as described above. The strip device is employed, for example, as one step of an electric wire processing device. In the upstream process of the electric wire processing device, the electric wire is cut into a predetermined size, and the cut electric wire holds the intermediate portion by the gripping arm 37.
Is supplied between the opposed cutting edges in a state of being gripped by the blade.

When air is blown into the air chamber 18, the piston rod 14 is pushed downward by the air, and the cutting edges A4, B4 and C4, D4 approach each other, and the electric wire W
A cut is made in the coating part C of the above. When the shaft 30 is rotated by an actuator (not shown), the bevel gear 3
1, bevel gear 28, shaft 26, clutch gear 2
7. The holder 2 rotates via the gear 23.

When the cutting edge A4, B4 and C4, D4 are cut into the coating portion C and the coating portion C is rotated by a predetermined angle (for example, 90 degrees) in the circumferential direction, the holder 2 further moves downward while rotating. I do. By lowering while rotating while the cutting edge is cut into the covering portion C, the covering portion C can be peeled off and the core wire can be twisted at the same time.

The downward movement of the holder 2 is performed by a cam 32. That is, when the shaft 30 rotates, the cam 32 rotates and the lever 36 engaged with the cam 32 rotates.
The entire strip unit including the holder 2, the transmission mechanism and the like is pushed down against the spring through the spring. Cam 3
2 rotates and the holder 2 descends by a predetermined amount.
The engagement between the lever 2 and the lever 36 is released, and the strip unit including the holder 2 is moved upward by the spring.

When the holder 2 returns to the original position, the air in the air chamber 18 is evacuated, the piston 16 moves upward by the spring 16, and the cutting edges move in directions away from each other. The electric wire with the core wire exposed by stripping off the covering portion at the end is inherited and transported from the state where it is gripped by the gripping arm 37 to a downstream process (for example, a soldering process).

The present invention has been described with reference to the drawings.
Other configurations can be easily selected by those skilled in the art for the configuration for moving the cutter blades closer to and away from each other, the configuration for rotating the cutter holder, and the configuration for reciprocating the cutter holder in the length direction of the electric wire. Some examples of such other means are as follows.

In the configuration shown in the drawing, the opposing cutting edges are approached or separated from each other by a spring, and the opposing cutting edges are urged in the approach direction by a spring, and the stopper is normally urged upward by a spring force. The opposing cutting edges are spaced apart. By injecting air from this state and moving the stopper downward by the force of the air, the opposing blade edges come close to each other by the force of the spring. Conversely, by moving the stopper upward by the force of air, the opposing blades may be separated from each other, and the spring force of the spring biasing the opposing blades in the approaching direction may be increased. In this case, the spring for urging the stopper upward can be omitted.

Regarding the configuration for rotating the cutter holder, instead of the bevel gears 28 and 31, a pinion gear,
A rack may be used. Alternatively, the spindle gear 23 may be directly rotated by an electric motor or the like. Bevel gear 31
Also, a pinion gear may be provided on the shaft 30 of the bevel gear 31, and the shaft 30 may be rotated by moving the rack by a linear motion cylinder.

As for the structure in which the cutter holder is moved up and down, the housing may be moved up and down directly by an electric motor or an air cylinder. In a configuration in which the housing is constantly urged upward, the configuration for moving the housing downward is not limited to the illustrated cam mechanism.For example, an inclined cam that can be moved in the horizontal direction by a linear motion cylinder is provided. The housing may move downward by moving the cam in a horizontal direction while maintaining the inclined shape along a cam follower separately provided in the main body.

[0043]

According to the first and second aspects of the present invention, the stripping of the covering portion of the electric wire and the twisting of the exposed core wire can be performed in one step. In particular, by employing the cutter described in the third and fourth aspects, it is possible to cut the covering portion and twist the exposed core wire satisfactorily without causing the core wire to break. In particular, such a configuration of the cutting edge is advantageous for twisting the core wire without causing the core wire to break.

[Brief description of the drawings]

FIG. 1 is a view showing a state in which a conventional cutter cuts into a covering portion of an electric wire.

FIG. 2 is a cross-sectional view (partially expanded) of the electric wire strip device according to the present invention.

FIG. 3 is a front view of the cutter holder.

FIG. 4A is a plan view of a holder. (B) is a top view of the holder which shows the state in which the cutter was mounted.

FIG. 5 is a plan view and a side view of the cutter according to the present invention.

FIG. 6 is a sectional view of a blade for explaining a blade constituting the cutter;
It is the top view which showed the blade body facing.

FIG. 7A is a plan view and a side view showing a state in which a cutter unit is in proximity. (B) It is a figure showing the state where the cutter concerning the present invention cut into the covering part of the electric wire.

FIG. 8 is a plan view showing a state where an electric wire is supplied by a grip arm.

FIG. 9 is a diagram showing engagement between a cam and a lever.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutter unit 2 Cutter holder A, B, C, D Blade body W Electric wire

Claims (8)

[Claims] An opposing blade edge is freely approachable / separable, a cutter for making a cut in a covering portion of an electric wire, and the cutter is mounted and rotatable about an axis passing through the electric wire as a virtual axis. A cutter holder that is reciprocally movable in the length direction of the electric wire, and the opposing cutting edges approach to make a cut in the covering portion of the end of the electric wire. In this state, the cutter holder rotates while rotating. And a wire stripping device configured to move in a direction away from the wire. 2. The electric wire according to claim 1, wherein the core of the electric wire is composed of a plurality of conductors, and when the cutter holder is moved in a direction away from the electric wire while rotating, the cutting edge of the electric wire is connected to the plurality of conductors. An electric wire strip device characterized by being configured to remove the covering portion while twisting. 3. The cutter according to claim 1, wherein one end of a flat body having a front surface and a back surface is formed as a bevel, and the front surface of the bevel is formed as a bevel. It is composed of four blades that form a blade, the blades are perpendicular to each other, the back surfaces are in close contact, and two blades are superimposed so that the blades are located on the same plane. Two sets of cutter units are formed, and the two sets of cutter units are disposed so as to face each other so that the opposing cutting edges are located on the same plane, and the opposing cutting edges are orthogonal to the length of the electric wire. An electric wire stripping device characterized by approaching. 4. The cutter according to claim 1, wherein the cutter has a pair of opposed V-shaped cutting edges, and the V-shaped cutting edges have a first cutting edge and a second cutting edge which are orthogonal to each other. The inclined surfaces forming the first and second cutting edges are formed on different sides of the blade body, and the side opposite to the inclined surface is formed on a horizontal plane, and the blade body is , So that the inclined surfaces of the cutting edges facing in parallel are on the same side,
An electric wire strip device, wherein four cutting edges are arranged on the same plane, and the opposing cutting edges approach orthogonally to the length of the electric wire. 5. An apparatus according to claim 1, wherein the opposing cutters are respectively held by moving blocks arranged opposite to the holder.
An electric wire strip device, which is capable of approaching / separating in a direction perpendicular to the length direction of the electric wire. 6. The moving block according to claim 5, wherein the moving block is urged in a direction approaching each other and has a cam follower, and a stopper is provided at a moving path of the moving block. The stopper is capable of reciprocating in the length direction of the electric wire and has a tapered cam surface, and the cam follower of the moving block comes into contact with the cam surface of the stopper to change the position of the cam surface. Wherein the distance between the opposite cutting edges is variable. 7. The holder according to claim 1, wherein the holder comprises a cylindrical portion extending in a length direction of the electric wire, and a cutter mounting portion integrally formed above the cylindrical portion. The strip device, wherein an opening is formed in a central portion of the plate-shaped portion, and the opening communicates with a cavity of the cylindrical portion. 8. A stripping apparatus according to claim 7, wherein a piston rod is provided inside said cylindrical portion so as to be movable up and down, and said stopper is provided at an end of said piston rod. .