JPH0736420Y2 - External conductive layer cutting mechanism and cutting device for power cable - Google Patents

Description

[Detailed description of the device]

[0001]

The present invention relates to an outer conductive layer cutting mechanism of a power cable, and an outer conductive layer mechanism of the power cable, which is suitable for cutting an outer conductive layer of a plastic insulated power cable such as a CV cable. The present invention relates to a cutting device using.

[0002]

2. Description of the Related Art For example, a conventional cutting device for cutting an outer conductive layer of a CV cable will be described with reference to FIG. 5 and below. First, the conventional cutting device 101 is as shown in FIGS. The support plates 103 and 104 are erected at both ends of the base 102 so as to face each other, and the support plates 103 and 104 are provided with large-diameter center openings 105 and 105 at their centers, respectively. A support roller 106 is provided in the vicinity of the peripheral edge of the center opening 105 inside the center opening 104.
Rotation having a plurality of concentric circles centered on 05 (four in the figure for convenience of explanation), an insertion hole 107 at the center, and a diameter larger than the diameter of the central opening 105. The plates 108 and 109 are rotatably supported by the support rollers 106, and the support plates 103 and 10
It is arranged so as to be rotatable around the center opening 105 of No. 4.

An annular chain gear (not shown) is provided on each of the rotary plates 108 and 109, and a chain is stretched between the chain gear and a separately provided driving body (not shown). The rotary plates 108 and 109 are synchronously rotated by the driving body. In addition, between these rotary plates 108, 109, these rotary plates 108, 10
In order to maintain the parallelism of 9
Multiple 0s are fixed. Also, the rotating plates 108, 1
The shafts 111 and 111 are passed between 09, and the pressing rollers 112 and 11 are respectively passed to the shafts 111 and 111.
3 is rotatably provided. Further, the shafts 111, 111 are configured to be urged toward the center of the rotating plates 108, 109 by an appropriate spring device (not shown).

Then, a rotary shaft 114 is passed between the rotary plates 108 and 109, and a cutting blade 1 having a blade on the outer circumference is provided.
15 is provided on the rotating shaft 114 and faces the above-mentioned restraining rollers 112 and 113. The rotary shaft 114 is connected to a separately provided driving body (not shown) by a flexible shaft 116, and the cutting blade 115 is rotated by this driving body. The cutting blade 115 has a total length that matches the axial length of the outer conductive layer to be cut.

Then, the power cable 117 whose outer conductive layer is cut is inserted into the respective insertion holes of the rotary plates 108 and 109 from the opposite direction to the flexible shaft 116, and the power cable 117 is supported by another object. , The pressing rollers 112, 113 are biased toward the center and pressed against the cutting blades 115 facing each other with the power cable 117 interposed therebetween, as shown in FIG. After that, the rotating plate 1
While rotating 08 and 109 to rotate (revolve) the cutting blade 115 around the power cable 117, the cutting blade 115 itself also rotates (rotates).

[0006]

By the way, generally, this kind of power cable 117 is wound around a drum for storage and transportation. Therefore, when the power cable 117 was extended, the winding curd at that time was left. Once such a curl has been attached, even if the realignment is performed to remove the curl before connecting the power cables, it is not possible to completely remove it due to the rigidity of the power cable itself. It was difficult, and a small winding curl remained as a so-called "bend".

When the outer conductive layer of the power cable in this state is cut by the above cutting device 101, the following problems occur. That is, when actually performing the cutting work, the bending of the cable is straightened by the cutting blade 115 and the restraining rollers 112 and 113 which are biased by the spring, but the rigidity of the power cable 117 is large. This cannot be completely corrected. Therefore, cutting blade 1
There was a problem that the cutting degree was not uniform even if 15 was rotated around the power cable 117.

For example, as shown in FIG. 7, in the case where the bending behavior of the power cable 117 is curved convex upward, when the cutting blade 115 is at the upper portion as shown in FIG. A large amount of the outer conductive layer is scraped off. Conversely, when the cutting blade 115 turns downward, both ends of the cutting portion of the cutting blade 115 are mainly scraped off.

On the other hand, for example, the CV cable 12
The structure of No. 1 has a conductor 122 at its center, as shown in FIG.
Are located on the outer side of the inner conductive layer 123 and the insulating layer 1
The CV cable 1 has a three-layer structure in which three layers of 24 and the outer conductive layer 125 are extruded and covered.
When performing the connection work of 21, as shown in FIGS. 9 and 10, first, the coating of the required length must be removed to expose the conductor (expose the conductor). And the outer conductive layer 12
The cutting removal of No. 5 is performed in any state after the protrusion shown in FIG. 9 or after the tapered cutting as shown in FIG. 10, that is, the so-called pencil cutting.

However, like the cutting boundary surface A of the insulating layer 124 in FIG. 9 and the cutting boundary surface B of the insulating layer 124 in FIG. 10, the respective cutting boundary surfaces A and B may be perpendicular to the cable axis. If there is no problem, this type of CV
When the above-mentioned lead-out or pencil cutting is performed on the cable, the boundary surface is not always perpendicular to the cable axis as shown in FIGS. 9 and 10, and FIGS. As shown in (4), it often has an inclination corresponding to the widths of L ₁ and L ₂ .
Therefore, in order to solve the above-mentioned problems, it must be noted that the external conductive layer can be cut without trouble by coping with such inclination.

[0011]

The present invention has been made in view of the above problems, and it is possible to uniformly cut the outer conductive layer even when the power cable has the above-described bend, and further, to make the insulating layer It is intended to solve the above-mentioned problems by providing an external conductive layer cutting mechanism and a cutting device for a power cable which can cut the external conductive layer without trouble even when the cutting boundary surface is inclined.

Therefore, first, in claim 1, as a mechanism for cutting the outer conductive layer itself of the power cable, it has a blade on the outer circumference and presses it on the outer circumference of the power cable to rotate itself while rotating around the outer circumference of the power cable. A mechanism for cutting the outer conductive layer of the power cable with the blade,
One end has a bladeless portion having the same diameter as the outer diameter of the mechanism main body, and the other end has a guide roller having a diameter smaller than the outer diameter of the mechanism rotatably coaxially with the device. Further, an outer conductive layer cutting mechanism for a power cable, characterized in that a substantially frustoconical guide portion having the coaxial axis as an axial center and tapering outward is provided at an outer end portion of the guide roller. To do.

According to a second aspect of the present invention, as a cutting device using the above cutting mechanism, a supporting plate is provided slidably along a base, and the supporting plate has a center plate through which a power cable can be inserted. Are rotatably opposed to each other, and further, a cutting mechanism for cutting the outer conductive layer of the power cable by the rotation of itself is supported on the rotating plate, and the cutting mechanism is attached to the power cable inserted into the center port. A pressing roller, which is urged against the cutting mechanism, is rotatably supported by the rotating plate and faces the cutting mechanism and is urged toward the center. The cutting mechanism has the same outer diameter as the mechanism itself at one end thereof. A non-blade portion, and a guide roller having a diameter smaller than the outer diameter of the cutting mechanism is rotatably coaxial with the device at the other end, and the outer end of the guide roller is provided. To the coaxial Characterized in that a substantially frustoconical guide portion that tapers in the axial Toshikatsu outward,
An outer conductive layer cutting device for a power cable is provided.

[0014]

According to the outer conductive layer cutting mechanism for a power cable of claim 1, the cutting mechanism itself is rotated (rotated) while pressing it against the outer periphery of the power cable, and further the entire cutting mechanism is rotated around the power cable ( When the power cable is moved to the guide roller side along the axial direction of the power cable, the blade of the cutting mechanism spirally cuts the outer conductive layer of the power cable. Since the guide roller itself has a smaller diameter than the cutting mechanism, the guide roller and the blade-free portion at the rear end of the cutting mechanism act as a stopper, so to speak, and correspond to the diameter difference (radius difference). The blade cuts the outer layer of the cable having the desired thickness, that is, the outer conductive layer.

By the way, when the outer conductive layer is cut to expose the inner insulating layer completely, it is necessary to cut a certain thickness (depth) including not only the outer conductive layer but also the inner insulating layer. According to this invention, if the diameter difference (radius difference) is set in advance so as to correspond to a constant thickness including the outer conductive layer of the power cable by the above-mentioned action, the blade is externally corresponding to the thickness. By cutting only a certain thickness including the conductive layer, the insulating layer portion is not excessively shaved, the cutting degree can be made uniform, and the internal insulating layer can be completely exposed.

Further, since the outer end portion (end portion in the traveling direction) of the guide roller is provided with a tapered conical trapezoidal guide portion, the cutting boundary surface of the power cable after tapping or pencil cutting is inclined. Even when the cutting mechanism revolves, the guide portion first contacts the cutting boundary surface and then guides the guide roller when the cutting mechanism revolves, so that the guide roller smoothly rides on the outer conductive layer (contacts the surface). Can be cut without any trouble.

According to the power cable outer conductive layer cutting device of the second aspect, the power cable to be cut is supported by another object, and the center opening of the rotary plate is inserted into the end portion of the cutting mechanism itself. When the support plate is moved in the axial direction of the power cable while being pressed (rotated) around the power cable while being rotated (rotated) and rotated (revolved) around the power, the blade of the cutting mechanism causes the power to move in the same manner as in claim 1. The outer conductive layer of the cable is spirally cut. By presetting the diameter difference (radius difference) between the guide roller and the cutting mechanism so as to correspond to a certain thickness including the outer conductive layer of the power cable, the cutting mechanism has a certain thickness including the outer conductive layer. Only the cutting is done and the insulating layer is not scraped off. Therefore, the cutting degree becomes uniform.

Further, as in the case of claim 1, since the outer end portion (the end portion in the traveling direction) of the guide roller is provided with a conical trapezoidal guide portion which is tapered, the guide roller after the tapping or the pencil cutting is formed. Even if the cutting boundary surface of the power cable is inclined, cutting can be performed smoothly by the cutting mechanism.

In both the first and second aspects, if the total length of the cutting mechanism in the axial direction is shortened, the end face of the cutting portion of each revolution of the cutting mechanism does not become a spiral non-uniform cutting surface, The surface of the power cable can be cut smoothly and uniformly by following the bending of the power cable.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view and FIG. 2 is an axial explanatory view.
Support plates 2 and 3 are provided on the base in this embodiment so as to be slidable in the longitudinal direction of the base 1 by rotating the drive shaft 4. Each support plate 2, 3 is provided with a large-diameter center opening 5, 5 at the center thereof, and inside each support plate 2, 3, a support roller 6 is provided near the periphery of the center opening 5 and Provided at multiple locations (four locations in the figure for convenience of explanation) on a concentric circle centered on the central opening 5,
Further, rotating plates 8 and 9 each having an insertion hole 7 in the center and having a diameter larger than the diameter of the center port 5 are rotatably supported by the respective support rollers 6 to center the center ports 5 of the respective support plates 2 and 3. It is arranged so that it can rotate freely.

An annular chain gear (not shown) is provided on each of the rotary plates 8 and 9, and the chain is stretched between the chain gear and a separate drive member (not shown) such as a motor. Then, the rotating plates 8 and 9 are synchronously rotated by this driving body. These rotary plates 8 and 9
In order to maintain the parallelism of the rotary plates 8 and 9 in between, a plurality of suitable connecting shafts 10 are fixed (see FIG. 1).
For convenience of description, the illustration of each of the connecting shafts 10 is omitted in FIG.

Further, a shaft 11 penetrates between the rotary plates 8 and 9, one end of which projects toward the rotary plate 9, and a pressing roller 12 is rotatably provided at the projecting end. The shaft 11 is configured to be urged toward the center of the rotary plates 8 and 9 by an appropriate spring device (not shown).

Arm fittings 18, 18 are provided on one of the connecting shafts between the rotating plates 8, 9 and these arm fittings 18, 1 are provided.
A rotary shaft 13 is rotatably passed between the tips of the shafts 8. Further, as shown in detail in FIG. 3, a cutting mechanism 14 having blades formed in a spiral shape on the outer periphery is provided on the rotating shaft 13 and faces the advance suppressing roller 12. In addition, as shown in FIG.
A spring 19 is provided between the rotary plate 8 and the rotary plates 8 and 9, and the force of the spring 19 causes the cutting mechanism 14 to
It is pressed against the outer conductive layer of the power cable to be cut (for convenience of explanation, the arm fitting 1 is shown in FIG. 1).
8, the spring 19 is not shown).

A bladeless portion 15 having the same outer diameter as that of the cutting mechanism 14 is formed at the rear portion (left side in FIG. 3) of the cutting mechanism 14 in the traveling direction. Of course, this bladeless part 1
Instead of 5, a suitable roller having the same outer diameter as the cutting mechanism 14 may be separately rotatably provided at the rear portion (left side in FIG. 3) of the cutting mechanism 14 in the traveling direction.

On the other hand, on the other side of the cutting mechanism 14, a guide roller 16 is provided coaxially with the cutting mechanism 14 rotatably and detachably with respect to the cutting mechanism 14. The outer diameter of the guide roller 16 is smaller than the outer diameter of the cutting mechanism 14, and the difference is set to be slightly larger than the thickness of the outer conductive layer of the power cable 17 to be cut.

Further, a guide portion 16a, which is formed in a truncated cone shape having the same axis as the axis and tapering outward, is provided on the front end surface (right side in FIG. 3) of the guide roller 16. . The relationship between the guide roller 16 having the guide portion 16a and the cutting mechanism 14 is set to have the following relationship.

[0027] That is, P: when cutting mechanism 14 one revolution around the power cable 17 (revolution) of one pitch proceeding axial length L _1: grind boundary when performing lead-out conductors of the power cable tilt surface (see FIG. 1 1) L _2: the inclination amount of the cutting boundary surface when subjected to penciling cutting power cable (see FIG. 12) theta: the slope of penciling cutting surface of the power cable (tapered portion) Angle (see FIG. 10) θ ₁ : Angle of the line connecting the corner of the cutting mechanism 14 on the side of the guide roller 16 and the corner of the guide roller 16 on the side of the guide portion 16a with respect to the axis of the power cable 17 (see FIG. 4) θ ₂ : inclination angle (with respect to the axis) of the guide portion 16a (see FIG. 4) ω: overall length of the guide roller 16 in the axial direction (see FIG. 4) W: from the overall length of the guide roller 16 in the axial direction to the guide portion 16a Long When a was, minus the length (see FIG. 4), ω> P + L 1, or _{P + L 2, θ> θ} 1> θ 2, also has a Naturally omega> W become such a relationship.

This embodiment is constructed as described above,
First, the power cable for cutting the outer conductive layer is supported and fixed at a predetermined position by another object. Next, as shown in FIG. 1, the support plates 2 and 3 are slid on the base 1 with respect to the power cable supported and fixed like a sled so that the guide roller 16 and the pressing roller 12 are connected to the power cable 17. Set at the tip of the. After that, a driving body (not shown) such as a motor is operated to rotate (rotate) the rotary shaft 13 and the cutting mechanism 14, and the drive shaft 4 is rotated to slide the base 1 toward the power cable 17 side. If (the slide of the support plates 2 and 3 on the base 1 in the direction of the arrow in FIG. 1), the cutting mechanism 14 is rotated (revolved) around the power cable 17 by the rotating plates 8 and 9 to cause the cutting mechanism 14 to rotate. 17
The outer conductive layer is cut while rotating the outer circumference of.

At this time, since the pressing roller 12 is biased toward the center, the center position of the power cable 17 and the support plates 2 and 3 is prevented from being displaced, and the power cable 1 is prevented.
7 is pressed against the opposing cutting mechanism 14 side. Then, the cutting mechanism 14 spirally cuts the outer conductive layer of the power cable 17, and the guide roller 16 having a radius difference slightly larger than the thickness of the outer conductive layer at the end of the cutting mechanism 14 in the traveling direction. Is provided, while the cutting mechanism 1
Since the blade-free portion 15 is provided at the rear end portion in the traveling direction of 4, the cutting mechanism 14 cuts only a certain thickness including the outer conductive layer and does not scrape extra. .

Further, unlike a conventional cutting blade having a total length corresponding to the length to be precut, a method of shortening the length of the cutting mechanism 14 and rotating the cutting mechanism 14 around the power cable 17 is used. Since this is adopted, the outer conductive layer can be uniformly cut following the bending of the power cable 17.

Moreover, as shown in FIGS. 1 and 3, at the end of the cutting operation, the sliding of the power cable of the cutting mechanism 14 in the axial direction is stopped, and the cutting mechanism 14 is rotated at the same point on the circumference of the power cable 17. By revolving along the axis, the cut end surface of the outer conductive layer can also be made perpendicular to the axial direction. The cutting chips generated during cutting are guided by the guide rollers 16 located at the front and rear ends of the cutting mechanism 14.
In addition, since it is removed by the rotation of the blade-free portion 15, the cutting waste does not act as a barrier to the cutting itself.

Further, since the guide roller 16 is provided with a guide portion 16a formed in a tapered truncated cone shape at the end portion in the traveling direction of the guide roller 16, the power cable 17 to be cut is shown in FIGS. Even if the cutting boundary surface is inclined as described above, when the cutting mechanism 14 revolves, the guide portion 16a first comes into contact with the cutting boundary surface and guides the guide roller 16 thereafter. You can ride on a layer (contact the surface) and perform subsequent cutting without any problems.

In this respect, for example, if the guide roller 16 only has no guide portion 16a, the end portion of the guide roller 16 in the traveling direction is caught on the cutting boundary surface, and the subsequent cutting is smoothly performed. You may not be able to do it. However, since the slanted tapered guide portion 16a is provided as in the present invention, such a catch does not occur.

Moreover, in this embodiment, as described above, ω> P
Since it has a relationship of + L ₁ or P + L ₂ , ω> P +
In case of L ₁ , the power cable in the case of FIG.
When> P + L ₂ , the subsequent cutting can be performed without trouble by merely placing the guide portions 16a on arbitrary points on the cutting boundary surface of the power cable in the case of FIG. Further, in the present embodiment, since the relation of θ> θ ₁ > θ ₂ is also provided, when cutting the outer conductive layer of the power cable after the completion of the pencil cutting, the cutting mechanism 14 advances at the beginning of cutting. It is possible to prevent a situation in which the directional corner portion cuts off the slope portion of the power cable and interferes with subsequent cutting.

Since the guide roller 16 is detachable, it can be replaced with another guide roller having a diameter corresponding to the thickness of the outer conductive layer of the target power cable, so that the guide roller 16 can have various sizes and the like. It can be applied to power cables.

[0036]

According to the first aspect of the present invention, the cutting mechanism is pressed against the outer periphery of the power cable while rotating (spinning) to further rotate (revolve) the cutting mechanism around the power cable, and the axial direction of the power cable. Slide along, the blade of the cutting mechanism will spirally cut the outer conductive layer of the power cable, and the degree of cutting at that time will depend on the diameter difference between the cutting mechanism and the guide roller. Since only the sand layer is cut, the outer conductive layer is not scraped off more than intended. Therefore, it is possible to cut only a certain thickness including the outer conductive layer. Further, since the guide roller that exerts such a high action is provided with a guide portion that is formed into a tapered truncated cone shape,
Even if the cutting boundary surface of the electric power cable is inclined after the lead-out or the pencil cutting, the cutting work can be performed smoothly from the cutting. Moreover, unlike the past,
Since it is possible to shorten the axial length of the cutting mechanism and revolve around the power cable while rotating it, it is possible to cut the outer conductive layer uniformly following the bending of the power cable. It is possible.

According to the second aspect of the present invention, since the cutting device employs the cutting mechanism of the first aspect, it is possible to cut only a certain thickness including the outer conductive layer, as in the first aspect. It is possible, and even if the cutting boundary surface of the power cable is inclined after the end of the lead-out or the pencil cutting, the cutting work can be performed smoothly from the cut-out. Further, since the outer conductive layer is cut in a spiral shape, it is possible to uniformly cut the outer conductive layer following the bending of the power cable. Moreover, by appropriately changing the moving speed in the axial direction, the surface can be smoothly cut, and the cutting end face can be made perpendicular to the axial direction.

[Brief description of drawings]

FIG. 1 is a side view of a cutting device according to an embodiment of the present invention.

FIG. 2 is an axial direction explanatory view of a main part of the cutting device according to the embodiment of the present invention.

FIG. 3 is an explanatory view showing a state in which the outer conductive layer of the power cable is cut by the cutting mechanism according to the embodiment of the present invention.

FIG. 4 is a side view of the cutting mechanism according to the embodiment of the present invention.

FIG. 5 is a side view of a cutting device according to a conventional technique.

6 is a cross-sectional view taken along the line AA in FIG.

FIG. 7 is an explanatory diagram showing a state in which an outer conductive layer of a power cable is being cut by a cutting blade according to a conventional technique.

FIG. 8 is an axial sectional view of a CV cable.

FIG. 9 is a side view showing how the conductor of the CV cable is exposed.

FIG. 10 is an explanatory diagram showing a situation in which a CV cable has been subjected to pencil cutting.

FIG. 11 is a side view showing a state in which a cut boundary surface of a CV cable in which a conductor is exposed is inclined.

FIG. 12 is a side view showing a state in which the cutting boundary surface of the CV cable subjected to the pencil cutting is inclined.

[Explanation of symbols]

 1 Base 2, 3 Support Plate 4 Drive Shaft 5 Center Port 6 Support Roller 7 Insertion Hole 8, 9 Rotating Plate 10 Connecting Shaft 11 Shaft 12 Holding Roller 13 Rotating Shaft 14 Cutting Mechanism 15 Bladeless Part 16 Bladeless Part 16a Guide Part 17 power cable

Claims (2)

[Scope of utility model registration request] 1. A mechanism having a blade on the outer periphery, which is pressed against the outer periphery of the power cable to rotate itself while rotating around the outer periphery of the power cable to cut the outer conductive layer of the power cable with the blade. Has a non-blade part having the same diameter as the outer diameter of the mechanism body at one end, and a guide roller having a diameter smaller than the outer diameter of the mechanism at the other end rotatably coaxially with the device. Further, an outer conductive layer cutting mechanism for a power cable, characterized in that a guide portion of a substantially frustoconical shape having the coaxial axis as an axial center and tapering outward is provided at an outer end portion of the guide roller. . 2. A support plate is slidably provided along a base, and the support plates are rotatably opposed to and supported by rotating plates each having a central port through which an electric power cable can be inserted, and further, the rotation of itself. A cutting mechanism for cutting the outer conductive layer of the power cable is supported by the rotating plate, and the cutting mechanism is urged against the power cable inserted into the center opening, and faces the cutting mechanism and has a center. The pressing mechanism rotatably supports the pressing plate rotatably on the rotating plate, and the cutting mechanism has a blade-free portion having the same diameter as the outer diameter of the mechanism itself at one end thereof. The end portion has a guide roller having a diameter smaller than the outer diameter of the cutting mechanism so as to be rotatable coaxially with the device, and the outer end portion of the guide roller has the same axis as the shaft center and the outer side. The shape of the truncated cone that tapers to the side An outer conductive layer cutting device for a power cable, characterized in that a guide portion is provided.