JPH079548Y2 - Rotating unit for wire stripping tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a rotating unit for an electric wire peeling tool for stripping the coating of a covered electric wire.

[Prior Art] There is known an electric wire peeling tool of a type in which a cutting blade is rotated around a covered electric wire to peel the electric wire covering in a spiral shape.

For example, Japanese Unexamined Utility Model Publication No. 1-147608 discloses a unit for an electric wire peeling tool that spirally peels the electric wire coating by rotating around the longitudinal axis of the electric wire.

This rotating unit includes a holding body having an insertion hole for accommodating the electric wire, and in this holding body, a cutting blade protruding into the insertion hole to cut the coating of the electric wire, and the cutting blade A cutting blade is also provided which projects toward the tip into the insertion hole and cuts the coating after cutting. Both the cutting blade and the cutting blade are slidable along an axis substantially orthogonal to the longitudinal axis of the electric wire, whereby the amount of protrusion of each blade into the insertion hole [that is, inside the insertion hole] The distance from the circumference to the inner side in the radial direction of the insertion hole] can be adjusted.

However, in this type of rotary unit, which attempts to fixedly adjust the amount of protrusion of the blade by providing the cutting blade or the cutting blade slidably, the amount of protrusion of the blade is set relatively precisely according to the thickness of the coating. What you have to do,
Further, even if the electric wire has the same outer diameter, the adjustment range of the protrusion amount of the blade is insufficient due to the change in the thickness of the coating, and further, in the snow-prevention type electric wire, which has been increasingly used in recent years, , There are formed a plurality of ridges that protrude radially outward from the outer peripheral surface of the wire and extend in the longitudinal direction of the wire, and because of these ridges, the inner peripheral surface of the insertion hole and the inner layer of the wire coating layer are Since the distance between the side surface and the side surface becomes large, it is necessary to be able to adjust the cutting blade or the amount of protrusion of the cutting blade in a larger range. There is a gap between the two, and when the rotation unit rotates around the longitudinal axis of the wire due to this gap, the center of the insertion hole and the center of the wire may be misaligned. If the amount of protrusion of the cutting blade into the insertion hole is set (Figure 8 (a)), is a place where the center of the wire insertion holes are matched there may damage the conductor of the electric wire by cutting deep cutting edge (Fig. (B)). Further, for example, in Japanese Utility Model Publication No. 50-36687, the cutting blade is pivotally attached to the rotary unit, and the cutting blade is biased by a spring so as to project into the insertion hole of the rotary unit. A stripping tool has been proposed. With this peeling tool, the cutting blade can automatically cut into the wire coating by the action of the spring,
It is not necessary to strictly adjust the amount of protrusion of the cutting blade into the insertion hole. When stripping the coating of electric wires with different diameters, attach an adapter and engage the bottom surface of the cutting blade with the end face of the notch formed in the adapter to limit the cutting depth of the cutting blade with respect to the coating layer. I have to. However, as described above, when peeling off the coating of an electric wire in which a plurality of ridges extending in the longitudinal direction are formed on the outer peripheral surface of the coating, it is assumed that the bottom surface of the cutting blade is engaged with the end surface of the notch of the adapter. Also, if the center of the insertion hole and the center of the wire are misaligned, the conductor of the wire may be damaged.

[Problems to be Solved by the Invention] In view of the problems in the prior art as described above, according to the invention of the present application, even if the wire is a snow-prevention type electric wire in which a plurality of ridges extending in the longitudinal direction are provided on the outer peripheral surface of the coating, It is an object of the present invention to provide a rotating unit for an electric wire peeling tool, which is capable of peeling off a coating without fear of being damaged.

[Means for Solving the Problem] In order to achieve the above-mentioned object, the present invention has an insertion hole for accommodating an electric wire, and rotates around the longitudinal axis of the electric wire in the insertion hole. By doing so, in the rotary unit for the electric wire peeling tool, which is configured to spirally peel off the coating of the electric wire along the longitudinal axis of the electric wire by the cutting blade protruding into the insertion hole, the cutting blade,
It is provided so as to be pivotable about an axis substantially parallel to the longitudinal axis, elastically biased in the same rotation direction as the cutting direction of the rotary unit, and provided between the rotary unit and the cutting blade. The amount of protrusion into the insertion hole is adjusted by the adjusting means, and the cutting blade is elastically biased in the same rotation direction as the cutting direction of the rotary unit at the lateral position of the cutting blade, and the projection is applied to the coating. It is characterized in that a guide is attached so as to be in contact with the cutting blade to keep the amount of bite into the coating constant.

Further, a cutting blade that extends toward the tip of the cutting blade and projects into the insertion hole is provided, and the cutting blade is configured to be pivotable about an axis substantially parallel to the longitudinal axis, and further the cutting of the rotary unit is performed. It is elastically biased in the direction of rotation opposite to the direction.

[Operation and Effect] The above-mentioned configuration, that is, the cutting blade is pivotable about an axis substantially parallel to the longitudinal axis of the electric wire, thereby increasing the adjustment range of the amount of protrusion of the cutting blade into the insertion hole. The tip of the cutting blade is always pressed inward in the radial direction of the wire by elastically biasing it in the same rotation direction as the cutting direction of the rotary unit, which causes the coating thickness of the wire to be increased. It is possible to automatically adjust the amount of protrusion according to the above, so there is no need to strictly adjust the amount of protrusion of the cutting blade beforehand, and the adjustment means provided between the rotary unit and the cutting blade allows the insertion hole to be inserted into the insertion hole. The amount of protrusion of the cutting blade is limited, and the guide provided at the side position of the cutting blade contacts the outer peripheral surface of the coating to limit the biting of the cutting blade into the coating, so that the center of the wire and the center of the insertion hole are In case of deviation Also, there is provided a rotary unit capable of widely responding to changes in the shape of the wire (changes in the thickness of the coating layer, presence / absence of convexity, etc.) without the risk of the cutting blade damaging the conductor of the wire.

Further, the cutting blades are arranged on the basis of the same principle as that of the above-mentioned cutting blades, so that the same effect can be obtained.

[Embodiment] As shown in FIG. 1, a rotary unit 10 for a peeling tool of the present invention includes a holder 12, a cutting unit 14 supported by the holder 12, and a holder similarly supported by the holder. Cutting unit
It consists of 16 and.

The holding body 12 has an insertion hole 18 for accommodating the electric wire inside.
Has a through hole which is hingedly connected to each other by a pin 19 to form a pair of semi-annular members.
It is defined by 20 and 21.

The cutting unit 14 meets the slot 22 by bolts 23 and 24, and the axis of the insertion hole, that is, the longitudinal axis L of the electric wire (FIG. 2).
A fixed portion 27 that is slidably fixed to the arm portion 26 of the semi-annular body 20 so that the position can be adjusted in a direction substantially orthogonal to, and a pin 28 with respect to the fixed portion 27 that is substantially parallel to the longitudinal axis ( A cutting blade support 29 pivotally mounted about an axis (longitudinal axis L which forms an angle of about 15 ° with the illustrated embodiment) and a holder fixed to this cutting blade support. 70 and a cutting blade 30 housed in the holder 70. Here, the holder 70 and the cutting blade 30 are
The cutting blade 30 is pivotable with respect to the fixed portion 27 through the pin 28, and the cutting blade 30 is pivotable relative to the holder 70.

A spring 31 is provided between the arm 26 of the semi-annular body 20 and the cutting blade support 29.
Is provided, the cutting blade support base, that is, the cutting blade 30 is biased clockwise in FIG. 1 and the tip of the cutting blade is inserted into the through hole.
It is pressing toward the center of 18. Arm 26 and cutting blade support
There is a screw-in pin 32 between 29 and this pin.
32 functions as a rotational position stopper for the cutting blade support base.
That is, the maximum depth of protrusion of the cutting blade 30 into the insertion hole 18 is determined by the screwing depth of the pin 32. Further, on one side of the holder 70, a guide 72 is provided which is located on the side of the cutting blade 30 and extends substantially horizontally and comes into contact with the outer peripheral surface of the coating 60 of the electric wire W in the insertion hole 18. (FIGS. 5, 6, and 7)
See figure). Further, between the holder 70 and the cutting blade 30, a screw 74 (see FIGS. 5 and 6) for adjusting the distance S (see FIG. 5) between the lower surface of the guide 72 and the tip of the cutting blade. Is provided. By adjusting the distance S with the screw 74, it is possible to limit the amount of cutting blade 30 that bites into the coating 60, thereby preventing the cutting blade from biting too much into the coating 60 and damaging the conductor. .

The cutting unit 16 uses the bolts 43 and 44 through the elongated holes 41 and 42 to insert the axial line of the insertion hole, that is, the longitudinal axis L of the electric wire (second
(Fig.) A fixing portion 47 slidably fixed to the arm portion 46 of the semi-annular body 20 so that the position can be adjusted in a direction substantially orthogonal to the direction,
From the cutting blade support 49 which is attached to the fixing portion 47 by a pin 48 so as to be pivotable about an axis substantially parallel to the longitudinal axis, and a cutting blade 50 fixed to the cutting blade support. It is configured.

A spring 51 is provided between the arm 46 of the semi-annular body 20 and the cutting blade support base 49.
Is provided, the cutting blade support base, that is, the cutting blade 30 is biased counterclockwise in FIG. 1 to press the tip of the cutting blade toward the center of the insertion hole 18. A screw pin 52 is provided between the arm portion 46 and the cutting blade support base 49, and this pin 52 functions as a rotation position stopper of the cutting blade support base. That is, depending on the screwing depth of the pin 52, the cutting blade 50
The maximum value of the amount of protrusion of the into the insertion hole 18 is determined.

Next, with reference to FIG. 3 and FIG. 4, the operation of peeling the coating of the electric wire by the electric wire peeling tool unit of the present invention will be described.

In FIGS. 3 and 4, details of the rotary unit are omitted, and only the two semi-annular bodies 20, 21, the cutting blade 30, and the cutting blade 50 are accommodated in a state where the electric wire W is accommodated in the insertion hole. It is shown schematically.

After the semi-annular body 21 is pivoted to accommodate the electric wire W in the insertion hole 18, the semi-annular body 21 is returned and fixed at a position shown in FIG. 3 by an appropriate locking means (not shown).

Next, the rotating unit is rotated in a direction indicated by an arrow R in FIG. 3 (clockwise direction: defined as a cutting direction in the present specification to mean a direction in which the coating is peeled), and the coating 60 of the electric wire is shown by the cutting blade 30. To peel off. At this time, since the cutting blade 30 is biased in the cutting direction as described above, the cutting blade overcomes the resistance of the coating and peels off.

When the peeling of the coating for a predetermined distance is completed, the rotating unit is rotated in the direction of arrow L, that is, in the counterclockwise direction which is the rotating direction opposite to the cutting direction, as shown in FIG. As described above, since the cutting blade 50 is biased in the rotation direction opposite to the cutting direction of the rotary unit, the cutting blade 50 cuts the coating while being pressed by the coating layer.

When stripping the coating of the wire W, that is, when stripping the coating by flipping it up (see FIG. 3), the screw
The distance S between the lower surface of the guide 72 and the tip of the cutting blade 30 is adjusted to approximately the thickness of the coating by the 74, and the lower surface of the guide 72 covers the wire W as shown in FIG. It is in constant contact with the 60 and maintains a constant distance from the cutting blade 30. Therefore, even if the center of the insertion hole 18 and the center of the electric wire W deviate from each other, the cutting blade 30 is bitten by the guide 72 by about the thickness of the coating 60, so that the conductor 60 is not damaged. Peel off (turn up and peel off)
be able to. Here, in the case where the guide 72 is not provided, as shown in FIG. 8A, the cutting depth of the cutting blade 30 is set with the center of the insertion hole 18 and the center of the electric wire W deviated. Then, even if the amount of protrusion of the cutting blade 30 into the insertion hole 18 is set by the pin 32, as shown in FIG. May be injured.

[Brief description of drawings]

FIG. 1 is a front view of a rotary unit for an electric wire peeling tool of the present invention, FIG. 2 is a plan view of FIG. 1, and FIGS. 3 and 4 are guides of the action of the rotary unit of the present invention. 5 is a schematic side view for explaining the relationship between the cutting blade and the guide, FIG. 6 is a front view for explaining the same, and FIG. 7 is a front view for explaining the action of the guide. 8A and 8B are explanatory side views in which parts are omitted, and FIGS. 8A and 8B are reference side views for explaining the operation of the rotating unit when the guide is not provided. 10: Rotating unit, 14: Cutting unit, 16: Cutting unit, 18: Insertion hole, 30: Cutting blade, 50: Cutting blade, 32: Adjusting means (screw pin), 60: Cover, 70: Holder, 72: guide.

Claims (2)

[Scope of utility model registration request] 1. An insertion hole 18 for accommodating an electric wire W,
By rotating around the longitudinal axis L of the electric wire W in the insertion hole 18, the cutting blade 30 protruding into the insertion hole 18
The coating of the wire W along the longitudinal axis L of the wire W by
In a rotary unit for an electric wire peeling tool, which is configured to spirally separate 60, the cutting blade 30 is pivotable around an axis substantially parallel to the longitudinal axis L, and the cutting direction of the rotary unit is Is elastically biased in the same rotation direction as, and the amount of protrusion to the insertion hole 18 is adjusted by the adjusting means 32 provided between the rotating unit and the cutting blade 30, and the cutting blade 30 A guide 72, which is pivotable relative to the cutting blade 30 and is in contact with the coating 60 to keep a constant amount of the cutting blade 30 biting into the coating 60, is provided at a lateral position. Rotating unit for electric wire peeling tools. 2. The electric wire peeling tool rotating unit according to claim 1, further comprising a cutting blade 50 extending toward the tip of the cutting blade 30 and projecting into the insertion hole 18.
The stripping of the electric wire is characterized in that 50 is pivotable about an axis substantially parallel to the longitudinal axis L and is elastically biased in a rotation direction opposite to the cutting direction of the rotary unit. Rotating unit for tools.