JPH0640413Y2 - Tool for peeling coated wire - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] In the present invention, two wires, such as electric wires, are twisted together, and the outer skin of a covered wire (hereinafter, referred to as twisted pair wire) having an outer skin is peeled off. The present invention relates to a peeling tool used for a wire stripper.

[Conventional technology]

BACKGROUND ART Conventionally, a hand tool such as a cutter or a nipper has been used to peel off an outer skin of a covered wire material such as an electric wire (hereinafter, an electric wire will be described as an example). In addition, JP-A-62-18908
As shown in Japanese Patent Publication, there is also provided an apparatus for semi-automatically peeling an outer skin by using air pressure.

The device disclosed in the above publication is shown in FIG. This device
A base stand 1, a chuck portion 3 for chucking the electric wire 2, a tool rest 4 that is slidable in the front-rear direction, for peeling off the outer skin of the electric wire 2, and a tool rest 4 for sliding the tool rest 4 in the direction A in the figure. It has a main air cylinder 5.

The chuck portion 3 is composed of a fixed chuck member 6, a movable chuck member 7 slidably in the left-right direction, and an air cylinder 8 for sliding the movable chuck member 7. Further, on the tool rest 4, a fixed tool 9 and
A movable blade 10 which is slidable in the left-right direction and an air cylinder 11 for sliding the movable blade 10 are arranged. The main body of the main air cylinder 5 is fixed to the tool rest 4, and the tip of the rod 12 is fixed to the base stand 1.

A rod 13 is provided on the block that supports the fixed blade 9, and a positioning member 14 is provided on the rod 13 so as to be slidable in the front-rear direction. At the tip of the positioning member 14, a contact member 15 with which the tip of the electric wire 2 can abut is provided.

In such an apparatus, when the outer skin of the tip of the electric wire 2 is peeled off, the tip of the electric wire 2 is brought into contact with the contact member 15 for positioning. Then, the air cylinder 8 is operated to sandwich the electric wire 2 between the movable chuck member 7 and the fixed chuck member 6. At the same time, activate the air cylinder 11,
The movable blade 10 is slid and the outer skin 2a of the electric wire 2 is cut by the double blades 9 and 10. Next, the main air cylinder 5 is operated to move the tool rest 4 in the direction A in the figure. As a result, the outer cover body at the tip of the electric wire 2 is peeled off.

[Problems to be solved by the device]

By the way, as shown in FIG. 11, among the electric wires, there are two wires 201 and 202 twisted together to prevent noise, and a so-called twisted pair wire in which the two electric wires 201 and 202 are coated with the outer cover 2a. is there.

In this twisted pair wire, since the two electric wires 201 and 202 are twisted together, their outer dimensions are not constant. That is, when the P1-P1 cross section of FIG. 11 is taken, it becomes a vertically long elliptical shape as shown in FIG. 12A, and when the P2-P2 line cross section of FIG. 11 is taken. 12th
As shown in Figure B, it has a horizontally long elliptical shape.

When attempting to peel off the outer body of the twisted pair wire whose outer dimensions are not constant with a conventional wire stripper, when the blades 9 and 10 hit a location as shown in FIG. The electric wires 201 and 202 are cut off. When it hits a part as shown in Fig. 12B, the internal wires 201,
There is a problem that 202 will be disconnected.

Therefore, in the twisted pair wire, the outer skin cannot be automatically peeled off by the conventional wire stripper, and it is the current situation that it is done manually by a tool such as a cutter. This is very inefficient.

An object of the present invention is to provide a tool for peeling a sheath wire of a coated wire rod which has a simple structure and is capable of automatically peeling the sheath body of a twisted pair wire.

[Means for Solving the Problems]

The coated wire stripping tool for peeling a coated wire according to the present invention is used as a wire stripper for peeling a coated wire rod having two outer layers and having an outer coating on its outer periphery.

The tool has a pair of straightening units and a pair of blades. Each of the pair of straightening portions has a semicircular straightening recess, and the covered wire is sandwiched between the straightening recesses to forcibly make the outer shape circular. The pair of blades is for cutting the outer skin of the covered wire that has been straightened by the pair of straightening portions.

[Action]

In the present invention, the chuck portion of the wire stripper is made to grip a twisted pair wire, for example. Then, when the peeling tool is operated, the twisted pair wire is sandwiched by the pair of straightening units. Since a semicircular correction concave portion is formed in each of the pair of correction portions, the twisted pair wire is clamped in the correction concave portion so that the external shape of the twisted pair wire is forced to be circular. Then, in a state where the twisted pair wire is straightened, the pair of blades approach each other to cut the outer skin of the twisted pair wire.

As a result, even when the outer shape is not a fixed size like a twisted pair wire, the outer shape is forcibly made into a circular shape by the correction section, and the outer body is automatically moved by the same operation as an ordinary circular electric wire. It can be cut and peeled.

〔Example〕

FIG. 3 to FIG. 6 are views showing a wire stripper in which the outer skin peeling tool according to one embodiment of the present invention is adopted. 3 is a perspective view of the wire stripper, FIG. 4 is a plan view thereof, FIG. 5 is a sectional front view thereof, and FIG. 6 is a sectional side view seen from the front side. It should be noted that piping is omitted in FIGS. 3 to 6, and details thereof are shown in FIG.

This wire stripper mainly consists of the base 20 and the chuck part.
21, a blade portion 22, and a main air cylinder 23 shown in FIG. 5 for moving the blade portion 22.

As shown in FIG. 4, a first solenoid valve 24, a second solenoid valve 25, and a distribution valve 26 are fixed to the side of the base 20. Further, as shown in FIG. 5, a limit valve 27 is fixed to the front portion inside the base 20 (the right side in the drawings is the front in FIGS. 4 and 5). The limit valve 27 is in an "open" state when the roller contact 27a is pressed. Distribution valve
An air compressor is connected to the inlet port of 26, and solenoid valves 24 and 25 and a limit valve 27 are connected to the outlet port. The first solenoid valve 24
Is for sliding a blade of a blade portion 22 described later in the left-right direction (vertical direction in the fourth view), and the second solenoid valve 25 is for operating the main air cylinder 23. Further, the limit valve 27 is connected to an air ejection nozzle described later via a hose. In addition, on the base plate 20a above the base table 20, the fifth
As is clear from the figures and FIG. 6, 1 extending in the front-back direction
The pair of guide rails 28a and 28b are fixed.

The chuck portion 21 has a chuck base plate 30 fixed to the rear ends of the guide rails 28a and 28b via a support block 29. A pair of chuck members 31 and 32 are arranged on the chuck base plate 30 so as to face each other. These chuck members 31, 32 are mounted on the chuck base plate 30 by shafts 33, 34 so as to be rotatable in a horizontal plane. Each chuck member 31, 32 has sandwiching surfaces 31a, 32a facing each other. The sandwiching surfaces 31a, 32a are arcuate surfaces that spread outward from the front to the rear. The center of the arc is eccentric with the centers of the shafts 33 and 34. Thereby, when the chuck members 31 and 32 are rotated so as to approach each other, the distance between the holding surfaces 31a and 32a is narrowed. Further, each of the holding surfaces 31a, 32a is formed in a sawtooth shape to prevent slippage when the electric wire is held.

As shown in an enlarged view in FIG. 9A and as apparent from FIG. 5, the lower surface of each chuck member 31, 32 is protruded downward toward the center from the center of rotation of the chuck member 31, 32 to fix the rods 35, 36. Has been done. The chuck base plate 30 has two notches 30
a and 30b are formed, and the rods 35 and 36 extend through the notch grooves 30a and 30b, respectively, and extend below the chuck base plate 30. On the other hand, locking pins 37 and 38 are provided on the lower surface of the chuck base plate 30 so as to project downward. Torsional springs 39, 40 are provided on the shafts 33, 34 of the chuck members 31, 32, one end of which is locked to the rods 35, 36 and the other end of which is locked by locking pins 37, 38. In this way, the chuck members 31 and 32 are always urged in the rotation direction (the C direction shown in 9A in the drawing) for gripping the electric wires.

The blade portion 22 has a slide member 41 slidably provided on the left and right guide rails 28a and 28b. The slide member 41 has a guide protrusion 41a that engages with the guide grooves of the guide rails 28a and 28b. A tool rest 42 is fixed to the upper end of the slide member 41.

The tool rest 42 is bilaterally symmetric, and a recess 42a for mounting the guide pipe 43 is provided in the center thereof. Further, slider guide portions 42b (see FIG. 5) having guide grooves are formed on both left and right sides of the tool rest 42. Blade sliders 44 and 45 are attached to the left and right slider guide portions 42b so as to be slidable in the left and right directions. The blade sliders 44 and 45 are formed in an H-shaped cross section as shown in FIG. 5, and the front end faces of the blade sliders 44 and 45 are provided with peeling tools 46 and 47 for cutting the outer skin of the wire. Is fixed by.

The peeling tools 46, 47 are, as shown in FIGS. 1 and 2A,
It is composed of a pair of blades 71, 72 and a pair of correction plates 73, 74 provided in close contact with them. Each blade 71,
Each of the 72 has a semi-circular cutter portion 71a, 72a corresponding to the diameter of the electric wire formed in the center thereof. Further, each of the correction plates 73, 74 has a semicircular correction recess 73a, 74a formed in the center thereof. This correction recess 73a, 74a
Is for straightening an electric wire, such as a twisted pair wire, whose outer diameter is not circular, into a circular shape. The inner diameters of the correction recesses 73a and 74a are formed to be slightly larger than the inner diameters of the cutter portions 71a and 72a.

Further, air cylinders 50 and 51 which are operated by the first solenoid valve 24 are fixed to the left and right ends of the tool rest 42, respectively. The rod of each air cylinder 50, 51 is
They are fixed to the blade sliders 44 and 45, respectively. Also,
A push plate 52 (see FIGS. 9A, 9B and 5) is provided on the upper surface of the slide member 41 and behind the tool rest 42. As shown in FIG. 9A, the rear end of the push plate 52 contacts the rods 35 and 36 at a position where the tool rest 42 approaches the chuck portion 21, and extends the chuck members 31 and 32 outward. It is rotated to.

In addition, a guide pipe 43 arranged at the center of the tool rest 42.
Is formed in a cylindrical shape, and a hole 43a corresponding to the diameter of the electric wire is formed in the central portion thereof. Further, it has a square flange 43b at its front end portion, and as shown in FIGS. 9A and 3, this flange 43b is a vertical notch formed at the center of the front end portion of the tool rest 42. It can be inserted into the grooves 42c and 42d.

Further, on the upper surface of the slide member 41, in front of the tool rest 42,
The cover 53 is fixed. The cover 53 has the lower guide rails 28a, 28b when the tool rest 42 is located at the rearmost position.
Is sized so that it can cover. Further, one end of the side of the cover 53 is bent upward as shown in FIG. And the tool rest 42 of this bent portion 53a
An air ejection nozzle 54 is fixed at a position adjacent to.
As mentioned above, this air jet nozzle 54 and limit valve
27 and are connected by piping. On the other hand, the other end side of the cover 53 is inclined downward.

A fixed block 55 is provided at the front end of the cover 53. A hole 55a is formed in the fixed block 55 in the front-rear direction, and a positioning rod 56 is slidably inserted into the hole 55a. The position of the positioning rod 56 is fixed by a fixing screw 57 provided above the fixing block 55. In addition, a contact portion 56a having a diameter sufficiently larger than the diameter of the electric wire is provided at the tip of the positioning rod 56. Then, as shown in FIG. 4, a scale 58 for measuring the dimension from the blades 46, 47 to the front is printed on the central portion of the cover 53.

The main air cylinder 23 is fixed inside the base 20, and an arm 60 is fixed to the tip of the rod 59 thereof. The upper end of the arm 60 is fixed to the slide member 41, and the rod 59 of the main air cylinder 23 expands and contracts so that the tool rest 42 slides in the front-rear direction along the guide rails 28a and 28b. .

Next, the sequence circuit of the apparatus of this embodiment will be described with reference to FIG.

A main switch MS is provided on the rear side wall of the base 20, as shown in FIG. 3, and a fuse F is connected in series and a pilot lamp PL is connected in parallel to the main switch MS. Also, a foot switch FS is connected to this device, and a relay coil CR is connected to this foot switch FS.
Are connected in series. In addition, in parallel with the foot switch FS, relay contacts CR1 and CR operated by the relay coil CR
2, CR3 is connected. And relay contact CR1 and first
The limit switch LS1 is connected in series, the relay contact CR2 and the first solenoid valve SOL1 (corresponding to the first solenoid valve 24 in FIG. 4 etc.) are connected in series, and the relay contact
2nd limit switch LS2 and 2nd solenoid valve SO on CR3
L2 (corresponding to the second solenoid valve 25 in FIG. 4 etc.) are connected in series.

The first limit switch LS1 is "closed" in the normal state and is provided at the front end position of the base 20 as shown in FIG. When the rod 59 of the main air cylinder 23 protrudes, the arm 60 moves the first
The limit switch LS1 is pressed to open it. The second limit switch LS2 is "closed" in the normal state, and is provided above the tool rest 42 as shown in FIG. And the blade slider
This 2nd limit switch LS2 with 45 protruding most
Press to close it.

FIG. 8 is a schematic pneumatic circuit diagram of this device.

As is clear from FIG. 8, the air compressor 61
Are connected to a first solenoid valve 24, a second solenoid valve 25, and a limit valve 27 via a distribution valve 26.
The first solenoid valve 24 is connected to the chambers 50a, 50b, 51a, 51b of the air cylinders 50, 51 for moving the blade, and the second solenoid valve 24
The solenoid valve 25 is provided in each chamber 23a, 23b of the main air cylinder 23.
It is connected to the. Further, the limit valve 27 is connected to the air ejection nozzle 54.

Next, the operation will be described with reference to the sequence circuit of FIG. 7 and the pneumatic circuit diagram of FIG.

When the main switch MS is turned on and the foot switch FS is turned off, the first and second solenoid valves 24 and
25 and the limit valve 27 are switched to the F position. Therefore, the blade sliders 44 and 45 connected to the air cylinders 50 and 51 are moved to the most retracted positions. Further, since the rod 59 of the main air cylinder 23 is also in the retracted state, the tool rest 42 is located at the rearmost position. Further, no air is blown out from the air jet nozzle 54.

Such an initial state is shown in FIG. 9A. In this initial state, since the tool rest 42 is moved to the rearmost side as described above, the chuck base plate 30 is moved from each chuck member 31, 32.
The rear end of the push plate 52 abuts on the rods 35 and 36 protruding to the lower surface, and pushes the rods 35 and 36 rearward. Therefore, the chuck members 31 and 32 rotate outwardly against the biasing forces of the torsion springs 39 and 40, and the clamping surfaces 31a and 32 thereof are rotated.
It is in the most open position during a.

In such a state, for example, the twisted pair wire 2 is passed through the hole 43a of the guide pipe 43, and the tip end thereof is brought into contact with the contact portion 56a of the positioning rod 56. The position of the positioning rod 56 in the front-rear direction is adjusted according to the size of the outer skin 2a of the twisted pair wire 2 that is peeled off with reference to the scale 58 printed on the cover 53.

After setting the twisted pair wire 2 by the above work and turning on the foot switch FS, the relay coil CR
Is excited and each relay contact CR1 to CR3 is turned on. As a result, the first solenoid valve 24 is actuated to switch from the F position to the E position as shown in FIG. Then, the air from the air compressor 61 is supplied into the clamp chambers 50a, 51a of the air cylinders 50, 51 via the distribution valve 26. Therefore, the blade sliders 44 and 45 respectively slide toward the center.

As a result, the peeling tools 46, 47 also approach each other. Since the outer diameter of the twisted pair wire 2 is a substantially elliptical shape,
For example, when chucked in the posture shown in FIG. 2A, the cutter parts 71a, 72a of the blades 71, 72 hit the upper and lower parts of the twisted pair wire 2. Also, almost at the same time,
The twisted pair wire 2 enters into the correction recesses 73a and 74a of the correction plates 73 and 74. When the blade sliders 44, 45 further approach and slide to the final position, the twisted pair wire 2 is forced to have a circular shape by the correction recesses 73a, 74a, as shown in FIG. 2B. In this state, the internal wire 20
1,202 is deformed by its elasticity, and the outer skin 2a has a circular shape, so only the outer skin 2a is cut by the circular cutter parts 71a, 72a of the blades 71, 72 without damaging the internal electric wires 201, 202. It

When the relay contact CR1 is turned on, a current is supplied to the relay coil CR via this contact CR1 and a self-holding circuit is formed. Therefore, once relay contact CR
After 1 is turned on, current is continuously supplied to the relay coil CR even if the foot switch FS is turned off.

As described above, in the blade portion 22 of the present apparatus, the outer diameter of the twisted pair wire 2 is forcibly made circular by the pair of straightening plates 73, 74, and the blades 71, 72 are moved from the left and right sides of the twisted pair wire 2 to move the outer skin. Cut 2a. Therefore, the outer body
Even when the outer diameter of 2a is not circular, only the outer cover 2a can be cut uniformly over the entire circumference without damaging the electric wires inside.

When the blade sliders 44 and 45 project and the outer skin 2a of the twisted pair wire 2 is cut by the peeling tools 46 and 47, the rear end of the blade slider 45 pushes the contact of the second limit switch LS2, and the second limit switch LS2. Turns on. Then,
As is clear from the circuit of FIG. 7, the second solenoid valve
25 is activated and the F position shown in FIG. 8 is switched to the E position. As a result, the air from the air compressor 61 passes through the distribution valve 26 and the rear chamber 23 of the main air cylinder 23.
Supplied to a. Therefore, the rod 59 of the main air cylinder 23 projects and slides the tool rest 42 forward through the arm 60 and the slide member 41.

When the slide member 41 slides forward, the push plate 52 on its upper surface moves forward. When the push plate 52 moves forward, the rear ends thereof separate from the rods 35 and 36 of the chuck members 31 and 32. As a result, the chuck members 31 and 32 are rotated by the biasing forces of the torsion springs 39 and 40, respectively, in the direction sandwiching the twisted pair wire 2 (direction C in FIG. 9A). This state is shown in FIG. 9B.

When the outer skin 2a of the twisted pair wire 2 is peeled off, the tool rest 42 moves forward, so that the twisted pair wire 2 is pulled further forward while being sandwiched between the chuck members 31 and 32. When the twisted pair wire 2 is pulled forward, this force causes the chuck members 31 and 32 to rotate in the C direction so as to further sandwich the twisted pair wire 2. Since the chuck members 31 and 32 have a shape in which the distance between the holding surfaces 31a and 32a becomes narrower as they rotate in the C direction, the twisted pair wire 2 can be gripped more firmly by the wedge effect. Becomes

Further, when the fingers are jammed, if the operator pulls his / her finger forward, the chuck members 31 and 32 rotate in such a direction that the distance between the sandwiching surfaces 31a and 32a increases. You can pull out your finger from between 31 and 32.

When the tool rest 42 moves forward while the twisted pair wire 2 is firmly gripped in this way, the outer cover 2a moves forward as shown in FIG. 9B, and the outer cover of the tip of the twisted pair 2 is moved. 2a is peeled off.

When the arm 60 slides to the front where the limit valve 27 is provided by the main air cylinder 23, the side surface of the arm 60 contacts the roller contact 27a of the limit valve 27.
As a result, the limit valve 27 is switched from the E position shown in FIG. 8 to the F position. Then the air compressor
The air from 61 is supplied to the air ejection nozzle 54 via the distribution valve 26, and the air is ejected from the air ejection nozzle 54. Due to the jet of air, the outer cover 2a that has been peeled off the twisted pair wire 2 and dropped onto the cover 53 is blown off to the side of the apparatus and is discharged into the outer cover discharge container (not shown).

When the rod 59 of the main air cylinder 23 protrudes to the most front position, the first limit switch LS
Press the 1 contact. As a result, the first limit switch LS1
Is "open" (off). As is clear from FIG.
When the first limit switch LS1 is turned off, the relay coil CR is no longer excited, so its relay contacts CR1 to CR3
Is turned off. As a result, the first solenoid valve 24 and the second solenoid valve 25 are switched to the F position as shown in FIG.

Therefore, the unclamp chambers 50b, 5 of the air cylinders 50, 51
Air is supplied to 1b and air is supplied to the front chamber 23b of the main air cylinder 23. This allows the turret 24
The tool sliders 44 and 45 of the tool slide outward, respectively, and the tool rest 42 itself also slides rearward to the initial state as shown in FIG. 9A.

Further, as the rod 59 of the main air cylinder 23 retracts, the roller contact 27a of the limit valve 27 also turns off, the limit valve 27 is switched from the E position to the F position, and air ejection from the air ejection nozzle 54 is also stopped. To do.

[Other Examples]

(A) In the above embodiment, the blades 71 and 72 and the straightening plates 73 and 74
Although and are configured as separate bodies, they may be configured as one body.

(B) In the above-described embodiment, the chuck portion 21 is fixed to the base 20, and the blade portion 22 is slidable in the front-back direction. On the contrary, the blade portion 22 is fixed to the base 20, The chuck portion 21 may be slidable in the front-back direction.

(C) In the above embodiment, the present invention is applied to a device in which both peeling tools 46 and 47 slide, but the peeling tool of the present invention is applied to a conventional device in which one is fixed and the other slides. Can also be applied.

(D) In the peeling tool, the positional relationship between the blade and the straightening plate in the front and rear is not limited to that in the above embodiment, but may be reversed. However, if the pinching traces of the straightening plate affect the quality, it is necessary to dispose the straightening plate in front.

[Effect of device]

As described above, in the present invention, the outer shape of the wire rod is forcibly made circular by the straightening unit, and the outer body is cut in the state of being straightened to this circle. The outer skin can be peeled off. Also,
The straightening portion can be made of a plate material in which a semicircular straightening concave portion is formed, and its configuration is also very simple.

[Brief description of drawings]

FIG. 1 is a plan view of an outer skin peeling tool according to an embodiment of the present invention, and FIGS. 2A and 2B are views for explaining the operation of peeling the outer skin of a twisted pair wire using the tool, FIG. Three
FIG. 4 is an overall perspective view of a wire stripper using the above tool, FIG. 4 is its plan view, FIG. 5 is its sectional front view, FIG. 6 is its sectional side view, and FIG. 7 is the sequence of said wire stripper. Circuit diagram, FIG. 8 is its pneumatic circuit diagram, FIGS. 9A and 9B are diagrams for explaining the operation of the wire stripper, FIG. 10 is a diagram showing a conventional wire stripper, and FIG. Is an external view of the twisted pair wire, Fig. 12A is the 11th view
12 is a sectional view taken along the line P2-P2 of FIG. 11. FIG. 12B is a sectional view taken along the line P1-P1 of FIG. 2 ... Twisted pair wire, 2a ... Outer skin, 46, 47 ... Peeling tool, 71, 72 ... Blade, 71a, 72a ... Cutter part, 73, 74 ... Straightening plate, 73a, 74a ... Straightening recess.

Claims (1)

[Scope of utility model registration request] 1. A tool for peeling an outer skin body, which is used for a wire stripper for peeling off an outer skin body of a coated wire material having two outer wire bodies twisted together and having an outer skin body on the outer periphery, each of which is a semicircular correction recess. And a pair of straightening portions for sandwiching the covered wire rod in the straightening recess to forcibly make the outer shape circular, and a coated wire rod rounded by the pair of straightening portions. A tool for peeling a sheath of a covered wire rod, comprising a pair of blades for cutting the sheath.