JP2000228812A - Stripper for electric wire covering - Google Patents

Abstract

PROBLEM TO BE SOLVED: To positively cut electric wire covering to satisfactorily strip the covering, regardless of the material of the covering and the depth of cut by an edged tool. SOLUTION: An electric wire covering stripper is provided with a drive gear 1 coupled directly with a motor 7, a main gear 2 to which driving force is transmitted from the drive gear 1, a cam gear 3 engaged with the main gear 2 by clearance fit, a rotation braking gear 4 engaged with the cam gear 3, a disk 5 secured on the cam gear 3 with set screws 20, a cutter 6 provided with a substantially circular edged tool 6a and a shaft 6b, and a stopper 13 secured on the disk 5 with a fixing screw 14. The edged tool 6a of the cutter 6 is a substantially circular plate with the end face of the circumference inclined. A notch 6aa without an edged tool is formed in an area on the end face of the circumference in the circumferential direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire coating stripping apparatus for mechanically stripping a wire coating.

[0002]

2. Description of the Related Art A known example of a conventional wire coating stripping apparatus is disclosed in, for example, JP-A-7-236215.

[0003] An electric wire covering stripping apparatus according to this known example has three cutters each provided with a substantially circular blade and arranged so as to be able to move steplessly in the core direction of the electric wire, and moves each cutter in the circumferential direction of the electric wire. The cutter is provided with a cutter entry means for causing the wire to penetrate radially toward the core of the electric wire while cutting, and penetrating into the covering of the electric wire, and a cutter rotating means for rotating each of the cutters that have penetrated the covering further along the outer periphery of the electric wire. . Then, the blades of three cutters arranged at equal intervals in the circumferential direction rotate along the outer periphery of the electric wire while cutting into the coating, thereby cutting the electric wire coating into a ring shape.

[0004]

However, the above prior art has the following problems. That is, in the above-described conventional technique, in the case of a relatively soft coating such as a vinyl chloride coating, when the blades of three cutters bite into the coating and rotate along the outer periphery of the electric wire, as shown in FIG. The blade 6a of the cutter 6 (not shown) is
Cutting line p rotated at a fixed position in the axial direction of
As shown in FIG. 8B, the blade 6a rotates with the rotation of the blade 6a.
In some cases, the axial position of “a” is gradually shifted, and the cutting tool 6 a becomes a cutting line “q” spirally entering the coating 10.

This is mainly caused when the three blades 6a are not accurately positioned at right angles to the axis of the electric wire 8 (see FIG. 8B), and the end shape of the coating cutting position becomes poor. There is also a possibility that the coating 10 may be peeled more than necessary, and further, it may not be possible to peel the coating 10 only by rotating the blade 6a.

An object of the present invention is to provide an electric wire stripping apparatus which can surely cut the coating into a ring shape and secure good peeling regardless of the material of the electric wire coating and the bite state of the blade.

[0007]

(1) In order to achieve the above object, the present invention provides at least one cutter provided with a blade portion and allowing the cutter to radially enter at least toward a core of an electric wire. Cutter entry means for cutting the blade portion into the wire coating; and cutter rotating means for rotating the cutter, which the blade portion has cut into the wire coating by the cutter entry means, along the outer periphery of the wire. Wherein the cutter is provided with an expanding means which is adjacent to the blade portion and non-incisively pushes and tears a cut of the coating formed by the blade portion biting. The cutter is made to enter the cutter in the radial direction by the cutter entry means, and the blade portion of the cutter is cut into the coating of the electric wire to form a cut in the coating. Thereafter, the cutter is rotated by the cutter rotating means so as to follow the outer periphery of the wire. At this time, in the conventional structure, for example, the entire surface of the blade tip is sharp, and the blade is further coated with the blade starting from the cut of the formed coating. Was opened in the circumferential direction. Therefore, for example, in the case of a relatively soft coating and the blade is not accurately positioned at a right angle to the axis of the wire and is inclined,
When the blade is rotated, it enters into the unopened portion of the coating obliquely, and even when rotated by a predetermined angle, the cutting line does not lead to the original coating notch and sometimes becomes spiral. In the present invention, the expanding means is provided adjacent to the blade portion of the cutter, and when the cutter is rotated along the outer periphery of the electric wire by the cutter rotating means, the cutting portion cuts out the cut of the coating formed by the blade portion. Non-incisively push open and tear. At this time, since the expanding means does not have an opening ability, even in the case described above, the oblique approach to the unopened portion of the coating as in the conventional structure is suppressed, and the diagonal expansion is performed on a certain diagonal line. Cutting can be performed. As a result, by rotating the cutter by a predetermined angle with the cutter rotating means, the cutting line that has been extended while being torn by the expanding means leads to the original coating notch after one round, and the wire coating is reliably cut into a ring shape. Can be. Thereby, good peeling of the coating can be secured.

(2) In the above (1), preferably,
The expanding means is provided forward of the blade portion in the rotation direction when the cutter rotates by the cutter rotating means.

(3) In the above (1), preferably, the cutter has a substantially circular blade as the blade portion, and cuts a part of the substantially circular blade as the expanding means. It has a notch configured to be chipped.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1A and 1A are front views showing the entire structure of an electric wire coating stripping apparatus according to this embodiment.
FIG. 1B is a side sectional view taken along the line AA. Further, FIG. 2 is an arrow view as viewed from the direction B, and FIG. 3 is an arrow view as viewed from the direction C, which shows the detailed detailed structure in FIGS.
Shown in

1 to 3, an electric wire coating stripping apparatus according to the present embodiment includes a driving gear 1 directly connected to a motor 7, a main gear 2 to which a driving force from the driving gear 1 is transmitted, and a main gear 2. A cam gear 3 fitted by a clearance fit, a rotation braking gear 4 meshing with the cam gear 3, a disk 5 screwed to the cam gear 3 with a set screw 20, and a substantially circular blade 6a (detailed structure will be described later). ) And a cutter 6 having a shaft portion 6b, and a stopper 13 fixed to the disk 5 by a fixing screw 14.

FIG. 4 is a side view and a back view showing the detailed structure of the cutter 6a of the cutter 6. As shown in FIG. As shown in FIG.
The blade 6a has a substantially disk shape with an outer peripheral end surface formed obliquely. At this time, a cutout 6aa without a blade is provided in a part of the outer peripheral end face in the circumferential direction.

In the above configuration, when the wire 8 composed of the sheath 10 and the core wire 9 is stripped, first, for example, a clamp mechanism (not shown) is used.
a and the electric gear passage hole 2a of the main gear 2 are securely fixed concentrically.

When the motor 7 is rotated in this fixed state, the drive gear 1 directly connected to the motor 7 rotates, so that the main gear 2 guided by the gear guide 22 rotates. At this time, the cam gear 3 fitted with the main gear 2 by the clearance fit meshes with the rotation braking gear 4 as described above, but does not rotate until a rotation force greater than the braking force of the rotation braking gear 4 is applied. ing. By setting the braking force of the rotary braking gear 4 to a strength at which the cutter 6 can bite into the wire coating 10 that is most difficult to bite, it is possible to adjust to the wire 8 of any material without adjustment.

At this time, on the other hand, the disk 5 is screwed to the cam gear 3 as described above, but the disk 5 is provided with a spiral groove 17 and the head of the shaft portion 6b of the cutter 6 is screwed into the spiral. It is guided by the groove 17. Shaft portion 6b of cutter 6
Has a square shape, and is fitted and guided in the slide groove 18 of the main gear 2. When the main gear 2 starts to rotate in the direction a in FIG. 1A as described above, the rotational force transmitted to the cam gear 3 at this time is smaller than the braking force of the rotational braking gear 4. Since the engaged cam gear 3 maintains the current state, only the main gear 2 rotates with respect to the cam gear 3. Therefore, the cutter 6 follows the slide groove 18 of the main gear 2 and the spiral groove 17 of the cam gear 3 and moves in the circumferential direction of the electric wire 8 toward the core wire 9 of the electric wire 8. At this time, since the bottom of the shaft portion 6b of the cutter 6 has a square shape as described above, the cutting tool portion 6ab adjacent to the notch portion 6aa of the cutting tool 6 is always kept at the most radially inner side. The cutter 6 moves while moving. That is, as viewed on the main gear 2, the cutter 6 is, as shown in FIG.
b moves only in the radial direction so as to go straight in the direction of the core wire 9 of the electric wire 8 (a 'direction). By such a movement, the biting blade portion 6ab of the cutter 6 is cut into the coating 10 of the electric wire 8, and a cut is formed in the coating 10. At this time, since the three cutters 6 are arranged at equal intervals at a pitch of 120 ° as shown in FIG. 1 (a), the escape of the wires 8 is prevented by inserting the wires 8 at three points. , Can be moved uniformly in the direction of the core.

As described above, when the main gear 2 rotates while the cutter 6 is being moved, the stopper pin 12 driven into the main gear 2 is rotated by the rotation of the main gear 2 so that the locus groove 19 formed in the cam gear 3 is formed. Figure 1 inside
(A) Move in the middle b direction. At substantially the same time when the cutter 6 reaches the radially inner end of the slide groove 18 of the main gear 2 and the radially inner end of the spiral groove 17 of the cam gear 3, the stopper pin 12 is provided near the end of the track groove 19. The stopper 13 abuts on the projected portion 13a of the stopper 13. At this time, since the stopper 13 is fixed to the disk 5 fixed to the cam gear 3 as described above, the rotational force of the main gear 2 is directly applied to the cam gear 3. This rotation force is set to be larger than the braking force of the rotation braking gear 4, whereby the rotation braking gear 4 also starts rotating, and the main gear 2, the cam gear 3, and the disk 5 rotate integrally. Start.

By the rotation of the main gear 2, the cam gear 3, and the disk 5 integrally, the cutter 6 stops moving in the center direction, and the slide groove 18 of the main gear 2 is stopped.
While maintaining the radially inner end of the blade 6a and the radially inner end of the spiral groove 17 of the cam gear 3 while maintaining the bite blade 6ab of the blade 6a always radially inward. 1 in the direction a in FIG. This corresponds to the rotation in the direction b 'in FIG. At this time, as shown in FIG.
The cutout portion 6aa is positioned forward in the rotation direction from the biting blade portion 6ab, so that the cutout of the coating formed by the biting blade portion 6ab is not cut open but pushed in a non-cutting manner. Spread and tear in the circumferential direction sequentially with rotation.

Here, the notch 6aa of the blade 6a is
Because it does not have the ability to cut open,
A relatively soft coating 10 as described above using (b).
Even when the three blades 6a are not accurately positioned at right angles to the axis of the electric wire 8, the entry into the unopened portion of the coating 10 as in the conventional structure is suppressed, and as shown in FIG. In addition, the notch 6aa moves on the oblique constant cutting line r. As a result, by rotating the cutter 6 by a predetermined angle (for example, about 120 °), the cutting line extending while being torn is connected to the notch of the cutter 6 adjacent to the front of the cutter 6 in the rotation direction, and the coating 10 of the electric wire 8 is securely formed. It can be cut into round slices. Thereby, good peeling of the coating can be secured.
Further, in order to perform the cutting more reliably, the cutter 6 may be further rotated several times.

The stopper 13 can be moved and adjusted in the track groove 13 of the cam gear 3 by loosening the fixing screw 14, and the alignment mark 15 is attached to the scale 16 at the upper part of the disk 5 as shown in FIG. By adjusting them, the movement amount of the cutter 6 can be adjusted easily and with good reproducibility. That is, the position of the stopper 13 is adjusted so that the cutter 6 bites into the coating 10 as close as possible to the core wire 9 of the electric wire 8, so that the coating 10 can be easily peeled off.

In the above configuration, the motor 7, the driving gear 1, the main gear 2, the slide groove 18, the cam gear 3,
The rotation braking gear 4, the disk 5, and the spiral groove 17 constitute cutter entry means for causing the cutter to enter at least radially toward the core of the electric wire and for cutting the blade portion into the covering of the electric wire, and the motor 7, the drive The gear 1, the main gear 2, the slide groove 18, the cam gear 3, the disk 5, the helical groove 17, the stopper 13, the protrusion 13 a, and the stopper pin 12 allow the cutter whose blade portion cuts into the electric wire coating by the cutter entry means to Cutter rotating means for rotating along the outer periphery of the electric wire is configured. Further, the notch 6aa of the cutter 6 is adjacent to the blade portion, and constitutes an expanding means for non-incisively pushing and expanding the cut of the coating formed by the bite portion being cut into the blade portion.

As described above, according to the present embodiment, it is possible to reliably cut the coating 10 into a ring-shaped shape for the electric wires 8 made of various coating materials, regardless of the bite form of the blade 6a. .

In the above embodiment, one blade 6a is used.
Although only one cutout portion 6aa is provided in the present embodiment, the present invention is not limited to this. FIG. 7 shows such a modification. In FIG. 7, first, the notch 6a on the opposite side of the notch 6aa in the structure of FIG.
ac is provided. This additional notch 6ac
Is for preventing the three cutter blades 6a from interfering with each other at the time of cutting the small-diameter electric wire as shown in FIG. Corresponding to this, the cutout portion 6aa is also formed to be cut deeper than the structure of FIG. Thereby, it is possible to cope with an electric wire having an extremely small outer diameter. In FIG. 7, notches 6aa 'and 6ac' are provided on the opposite side of the notches 6aa and 6ac of the cutter 6a, respectively, in line symmetry with the axis of the cutter 6a. Thereby, even if one notch 6aa of the blade 6a is worn, the blade 6a is
By changing the direction and using the notch 6aa ', two blades can be used with one blade 6a.

[0023]

According to the present invention, it is possible to reliably cut the electric wire in a ring-shape without being limited by the material of the coating or the bite form of the blade. Therefore, it is particularly effective in a market that handles a wide variety of electric wires.

[Brief description of the drawings]

FIG. 1 is a front view and a side cross-sectional view illustrating an entire structure of an electric wire coating stripping apparatus according to an embodiment of the present invention.

FIG. 2 is an arrow view showing a partial detailed structure in FIG. 1 as viewed from a direction B.

FIG. 3 is an arrow view showing a partial detailed structure in FIG. 1 viewed from a direction C.

FIG. 4 is a side view and a rear view showing a detailed structure of a blade of the cutter shown in FIG. 1;

FIG. 5 is an explanatory diagram showing the movement of a cutter as viewed on a main gear.

FIG. 6 is a diagram illustrating a state in which a notch illustrated in FIG. 4 advances on a constant oblique cutting line r.

FIG. 7 is a view showing a modification in which a plurality of notches are provided.

FIG. 8 is a diagram for explaining a problem of a conventional structure in which a blade enters a coating spirally.

[Explanation of symbols]

Reference Signs List 1 drive gear (cutter entry means, cutter rotation means) 2 main gear (cutter entry means, cutter rotation means) 3 cam gear (cutter entry means, cutter rotation means) 4 rotation braking gear (cutter entry means) 5 disk (cutter entry means) , Cutter rotating means) 6 cutter 6a blade 6aa notch (expanding means) 7 motor (cutter entering means, cutter rotating means) 12 stopper pin (cutter rotating means) 13 stopper (cutter rotating means) 13a protrusion (cutter rotating) Means) 17 Spiral groove (cutter entry means, cutter rotation means) 18 Slide groove (cutter entry means, cutter rotation means)

Claims (3)

[Claims] At least one cutter having a blade portion, cutter entry means for radially entering the cutter toward at least a core of the electric wire, and cutting the blade portion into a coating of the electric wire, and the cutter An electric wire coating stripping device comprising: a cutter rotating unit configured to rotate the cutter, which has been cut into the coating of the electric wire by the blade portion by an entry unit, so as to rotate along the outer periphery of the electric wire. The cutter is adjacent to the blade portion. An electric wire coating stripping device, comprising: an expanding means for non-incisively expanding and tearing a cut of the coating formed by the blade portion biting. 2. The electric wire coating stripping apparatus according to claim 1, wherein the expanding means is provided forward of the blade portion in a rotation direction when the cutter is rotated by the cutter rotating means. An electric wire coating stripping apparatus. 3. The apparatus according to claim 1, wherein said cutter has a substantially circular blade as said blade portion, and cuts a part of said substantially circular blade as said expanding means. An electric wire coating stripping device, comprising: a notch configured to be chipped.