JPH0570120U - External conductive layer cutting blade of power cable and cutting device - Google Patents

Abstract

(57) [Abstract] [Purpose] Even for a power cable having a bend, the surface of the power cable including the outer conductive layer is uniformly and smoothly cut. [Structure] Support plates 2 and 3 are slidably provided along a base 1, and rotary plates 8 and 9 having insertion holes through which a power cable 17 can be inserted are rotatably opposed to the support plates 2 and 3, respectively. And a cutting blade 14 that cuts the outer peripheral layer of the power cable 17 is rotatably supported by the rotary plates 8 and 9, and faces the cutting blade 14 and the cutting blade 14 between the rotary plates 8 and 9. The pressing roller 12 rotatably supported is urged in the central direction, the cutting blade 14 is provided with a blade-free portion 15, and a guide roller 16 having a diameter smaller than that of the cutting blade 14 is provided at the end on the advancing direction side. It is provided rotatably on the same axis as 14.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

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

[0002]

[Prior Art]

 For example, a conventional cutting device and a cutting blade for cutting the outer conductive layer of a CV cable will be described with reference to FIG. 4 and below. First, as shown in FIGS. The support plates 53 and 54 are erected at both ends of 52 so as to be opposed to each other, and the support plates 53 and 54 are provided with large-diameter center openings 55 and 55 at their centers. The support rollers 56 are provided at a plurality of locations in the vicinity of the peripheral edge of the center opening 55 and on a concentric circle centered on the center opening 55 (four locations are provided in FIG. 5 for convenience of explanation), and further inserted in the center. Rotating plates 58 and 59 having a hole 57 and having a size larger than the diameter of the central opening 55 are rotatably supported by the supporting rollers 56 and are rotatable about the central opening 55 of the supporting plates 53 and 54. It is arranged so that An annular chain gear (not shown) is provided on each of the rotary plates 58 and 59, and a chain is stretched between the chain gear and a drive unit (not shown) separately provided, and the chain is rotated by the drive unit. The plates 58 and 59 are adapted to rotate in synchronization with each other. A plurality of suitable connecting shafts 60 are fixed between the rotary plates 58 and 59 in order to keep the rotary plates 58 and 59 parallel to each other (in FIG. 4, for convenience of explanation, these connecting shafts 60 and 59 are connected together). The connecting shaft 60 is omitted). Shafts 61 and 61 are passed between the rotating plates 58 and 59, and restraining rollers 62 and 63 are rotatably provided on the shafts 61 and 61, respectively. Further, each of these shafts 61, 61 can be biased toward the center of the rotating plates 58, 59 by an appropriate spring device (not shown). Further, a rotary shaft 64 is passed between the rotary plates 58 and 59, and a cutting blade 65 having a spiral blade on the outer circumference is provided on the rotary shaft 64 to face the above-mentioned restraining rollers 62 and 63. .. The rotating shaft 64 is connected to a separately provided driving body (not shown) by a flexible shaft 66, and the cutting blade 65 is rotated by the driving body. The cutting blade 65 has a total length that matches the axial length of the outer conductive layer to be cut.

The power cable 67 whose outer conductive layer is to be cut is inserted into the respective insertion holes 57 of the rotary plates 58 and 59 from the opposite direction to the flexible shaft 66, and the power cable 67 is inserted by another object. While supporting and fixing, the pressing rollers 62 and 63 are biased toward the center, and as shown in FIG. 5, the power cable 67 is sandwiched and pressed against the opposing cutting blades 65. After that, while rotating (revolving) the cutting blade 65 around the power cable 67 by rotating the rotating plates 58 and 59, the cutting blade 65 itself is also rotated (rotated), so that the outer conductive layer of the power cable 67 is separated. It was supposed to be cut.

[0004]

[Problems to be solved by the device]

 By the way, generally, this kind of power cable 67 is wound around a drum and stored and transported. Therefore, when the power cable 67 is extended, the winding curl when it is wound on such a drum remains, and even if it is realigned to remove the curl before connecting the cables, it will be completely removed. It is difficult to remove it, and a minute curl remains as a bend.

When the outer conductive layer of the power cable in this state is cut by the above cutting device 51, the following problems occur. When actually carrying out the cutting work, the straightness of the cable bend depends on the cutting blades 65 and the restraining rollers 62 and 63 which are biased by the sprinkles, but the rigidity of the power cable 67 is large. This cannot be completely corrected. Therefore, even if the cutting blade 65 revolves around the power cable 67, the cutting degree is not uniform. That is, as shown in FIG. 6, for example, when the bending behavior of the power cable 67 is convexly curved upward, when the cutting blade 65 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 65 turns downward, both ends of the cutting portion of the cutting blade 65 are mainly scraped off. If the power cable 67, which has been cut in such a situation, is rearranged, it becomes as shown in FIG. As can be seen from FIG. 7, the outer conductive layer in the cut portion is not required to have a uniform degree of cutting, and the cut end surface of the outer conductive layer is originally required to be perpendicular to the axial direction of the power cable 67. However, in the conventional cutting device, it will be tilted as shown in the figure.

[0006]

[Means for Solving the Problems]

 The present invention has been made in view of such problems, and provides a cutting blade and a cutting device capable of uniformly cutting the outer conductive layer even when the cable has a bend.

With respect to the structure of the present invention, the cutting blade recited in claim 1 has the following structure. First, regarding the outer conductive layer cutting blade of a power cable that directly cuts the outer conductive layer, the outer conductive layer cutting blade has a spiral blade on the outer circumference and is pressed against the outer circumference of the power cable to rotate (rotate) itself and A cutting blade that rotates (revolves) around the outer circumference of the cable to cut the outer conductive layer of the power cable, and has a blade-free portion with the same outer diameter as the cutting blade itself at one end (the rear portion in the traveling direction). A guide roller having a diameter smaller than the outer diameter of the cutting blade is provided at the other end (the front portion in the traveling direction) so as to be rotatable coaxially with the cutting blade.

Further, as a device using the cutting blade having such a configuration, an external conductive layer cutting device of the following power cable can be proposed as claim 2. That is, a support plate is provided slidably along the base, and each support plate rotatably faces and supports a rotary plate having a central hole through which an electric power cable can be inserted. A cutting blade that cuts the outer conductive layer of the cable is supported by the rotating plate, and the cutting blade is urged against the power cable inserted in the center hole and faces the cutting blade and is in the center direction. A pressing roller that can be freely urged to is rotatably supported on the rotary plate, and the cutting blade has a blade-free portion having the same outer diameter as the cutting blade itself at one end thereof as in the above-mentioned claim 1. At the other end, a guide roller having a diameter smaller than the outer diameter of the cutting blade is provided so as to be rotatable coaxially with the cutting blade.

[0009]

[Action]

 According to the outer conductive layer cutting blade of the electric power cable of claim 1, while pressing the outer conductive layer cutting blade against the outer periphery of the target electric power cable and further rotating (revolving) around the electric power cable, along the axial direction of the electric power cable. As it moves to the guide roller side, the blade of the cutting blade spirally cuts the outer conductive layer of the power cable. Since the guide roller has a diameter smaller than that of the cutting blade, the guide roller and the blade-free portion at the rear end of the cutting blade on the one hand act as a stopper, and the difference in diameter (radius) The cutting blade cuts the outer layer of cable with a thickness corresponding to the difference. When the outer conductive layer is cut to expose the inner insulating layer completely, it is necessary to cut a certain thickness including not only the outer conductive layer but also the inner insulating layer. Therefore, 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, the cutting blade has only a constant thickness including the outer conductive layer. It is possible to completely expose the internal insulating layer without cutting the insulating layer excessively by cutting the inside. Moreover, the cutting surface is smooth.

According to the outer conductive layer cutting device for a power cable of claim 2, the target power cable to be cut is supported by another object, and the center hole of the rotating plate is inserted into the end portion of the power cable to cut the cutting blade itself. When the body is rotated (rotated) while being pressed against the outer circumference of the target power cable, and the support plate is slid in the axial direction of the power cable while being rotated (revolved) around the power cable, the cutting blade is the same as in claim 1 above. The blade cuts the outer conductive layer of the power cable in a spiral shape. By presetting the diameter difference (radius difference) between the guide roller and the cutting blade so as to correspond to a certain thickness including the outer conductive layer of the power cable, the cutting blade has a certain thickness including the outer conductive layer. Only the cutting is done, and the insulating layer is not scraped off.

Also, in the case of claims 1 and 2, if the total length (cutting portion) in the axial direction of the cutting blade is shortened, the end surface of the cutting portion of each revolution is spirally and unevenly cut. The surface can be cut smoothly and evenly without following the bending of the target power cable.

[0012]

【Example】

 FIG. 1 is a side view and FIG. 2 is an explanatory view in the axial direction. The support plates 2 and 3 on the base 1 rotate the drive shaft 4 to explain the embodiment of the present invention. It is provided so as to be slidable in the longitudinal direction of the base 1. Each support plate 2, 3 is provided with a large-diameter central 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 central opening 5 and at the center. The rotary plate 8 is provided at a plurality of locations (four locations in the figure for convenience of explanation) on a concentric circle having the mouth 5 as a center, and further has an insertion hole 7 in the center and a diameter larger than the diameter of the center mouth 5. 9 is rotatably supported by each of the support rollers 6 and is arranged so as to be rotatable about the central opening 5 of each of the support plates 2 and 3.

An annular chain gear (not shown) is provided on each of the rotary plates 8 and 9, and a chain is stretched between the chain gear and a separately provided driving body (not shown) to drive the drive. The rotating plates 8 and 9 are adapted to rotate synchronously by the body. A plurality of suitable connecting shafts 10 are fixed between the rotary plates 8 and 9 in order to maintain the parallelism of the rotary plates 8 and 9 (in FIG. 1, for the sake of convenience of explanation, these connecting shafts are connected together). The illustration of 10 is omitted). A shaft 11 penetrates between the rotary plates 8 and 9, one end of which protrudes toward the rotary plate 9 side, and a pressing roller 12 is rotatably provided at the protruding end. The shaft 11 can be urged toward the center of the rotary plates 8 and 9 by an appropriate spring device (not shown).

Further, one of the connecting shafts between the rotating plates 8 and 9 is provided with arm fittings 18 and 18, and a rotating shaft 13 is rotatably passed between the tips of the arm fittings 18 and 18. .. As shown in detail in FIG. 3, a cutting blade 14 having a spiral blade on the outer circumference is provided on the rotary shaft 13 and faces the advance suppressing roller 12. Further, as shown in FIG. 2, a spring 19 is provided between each arm fitting 18 and 18 and each rotary plate 8 and 9, and the force of this spring 19 causes the cutting blade 14 to cut the power cable 17 to be cut. Is pressed against the outer conductive layer (for convenience of explanation, the arm fitting 18 and the spring 19 are omitted in FIG. 1). A bladeless portion 15 having the same outer diameter as that of the cutting blade 14 is formed at the rear portion (left side in FIG. 3) in the traveling direction of the cutting blade 14. Of course, instead of the non-blade portion 15, an appropriate roller having the same outer diameter as the cutting blade 14 may be separately rotatably provided at the rear portion (left side in FIG. 3) of the cutting blade 14 in the traveling direction.

On the other hand, on the other side of the cutting blade 14, a guide roller 16 is provided coaxially with the cutting blade 14 rotatably and detachably with respect to the cutting blade 14. The outer diameter of the guide roller 16 is smaller than the outer diameter of the cutting blade 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. The guide roller 16 is replaceable. Further, in this embodiment, the cutting blade 14, the non-blade portion 15 of the cutting blade 14, and the peripheral edges of the end portions of the guide roller 16 are all formed into a round shape, and in particular, the guide roller side of the cutting blade 14 is a power cable. Matched to the shape required for connection work. The rotating shaft 13 is connected to a separately provided driving body (not shown) by a shaft having a spline structure, and the cutting blade 14 is rotated by this driving body.

The present embodiment is configured as described above. First, the power cable 17 for cutting the outer conductive layer is supported and fixed at a prescribed position by another object. Next, in FIG. 1, the supporting plates 2 and 3 are slid on the base 1 with respect to the power cable 17 supported and fixed as described above, and the guide roller 16 and the pressing roller 12 are attached to the tip of the power cable 17. Put it on. After that, the drive body (not shown) is operated to rotate (rotate) the rotary shaft 13 and the cutting blade 14, and the base 1 with the drive shaft 4 is rotated to slide the power cable 17 to the power cable 17 side (see FIG. 1). In the direction of →, the support plates 2 and 3 slide on the base 1), and the rotation of the rotating plates 8 and 9 causes the cutting blade 14 to rotate around the power cable 17 (revolution). The outer conductive layer is cut while rotating the outer circumference of the power cable 17. 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 17 is pressed against the opposing cutting blade 14 side. There is.

Then, the cutting blade 14 spirally cuts the outer conductive layer of the power cable 17, and at the end of the cutting blade 14 in the traveling direction, the radius difference is slightly larger than the thickness of the outer conductive layer. Is provided with a guide roller 16 and the cutting blade 14 is provided with a non-blade portion 15 at the rear end thereof in the advancing direction of the cutting blade 14. Therefore, the cutting blade 14 includes an outer conductive layer and cuts only a certain thickness. I will not scrape it off.

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 blade 14 and revolving it around the electric power cable 17 is used. Since it is adopted, the outer conductive layer can be uniformly cut following the bending of the power cable. Moreover, as shown in FIGS. 1 and 3, at the end of the cutting operation, the cutting blade 14 is stopped from sliding in the axial direction of the power cable 17, and the cutting blade 14 is circumscribed at the same point on 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.

Since the guide roller 16 has a detachable structure, it can be adapted to each power cable by appropriately replacing it with another guide roller having a diameter corresponding to the thickness of the outer conductive layer of the target power cable. You can

[0020]

[Effect of the device]

 According to claim 1, while rotating (spinning), pressing against the outer periphery of the target power cable and further rotating (revolving) around the power cable, it moves to the guide roller side along the axial direction of the power cable. By doing so, the outer conductive layer of the power cable can be spirally cut by the blade of the cutting blade, and the cutting blade only cuts the layer according to the diameter difference from the guide roller, depending on the intended purpose. However, it is not scraped off. Therefore, it is possible to cut only a certain thickness including the outer conductive layer. Moreover, the surface can be cut smoothly. Also, unlike the conventional method, the cutting blade can be shortened and rotated around it to revolve around the power cable in a spiral, so that the external conductivity of the power cable can be evenly followed by the bending of the power cable. The layer can be cut. In addition, it is structurally simple and easy to handle.

According to the second aspect, since the cutting device uses the cutting edge according to the first aspect, the cutting edge cuts only the layer corresponding to the diameter difference from the guide roller as in the first aspect. Therefore, it will not be scraped off more than intended. Therefore, it is possible to cut only a certain thickness including the outer conductive layer. The cutting surface is also smooth. Moreover, since the system revolves around the power cable in a spiral shape, it is possible to follow the bend of the power cable and evenly cut the outer circumference. Further, the cutting end face can also be 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 a side view of a cutting blade according to an embodiment of the present invention.

FIG. 4 is a side view of a cutting device according to a conventional technique.

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

FIG. 6 is an explanatory diagram showing a situation in which an outer conductive layer of a power cable is being cut by a cutting blade according to a conventional technique.

FIG. 7 is a side view of a power cable in which an outer conductive layer is cut by a cutting blade according to a conventional technique.

[Explanation of symbols]

 1 Base 2 Support Plate 3 Support Plate 4 Spline Shaft 5 Center Port 6 Support Roller 7 Insertion Hole 8 Rotating Plate 9 Rotating Plate 10 Connecting Shaft 11 Shaft 12 Holding Roller 13 Rotating Shaft 14 Cutting Blade 15 Bladeless Part 16 Guide Roller 17 Electric Power cable

Claims (2)

[Scope of utility model registration request] 1. A cutting blade which has a spiral blade on its outer circumference and presses against the outer circumference of a power cable to rotate itself and to rotate around the outer circumference of the power cable to cut the outer conductive layer of the power cable. And a guide roller with a diameter smaller than the outer diameter of the cutting blade is provided on one end, and a guide roller with the same diameter as the outer diameter of the cutting blade itself is rotatable on the other end coaxially with the cutting blade. An outer conductive layer cutting blade of a power cable, characterized in that 2. A supporting plate is slidably provided along a base, and rotating plates each having a central hole through which a power cable can be inserted are rotatably opposed to each other and supported by the supporting plate. A cutting blade for cutting the outer conductive layer of the power cable is supported by the rotating plate, and the cutting blade is biased to the power cable inserted into the center hole, facing the cutting blade and in the center direction. An urging restraining roller is rotatably supported on the above-mentioned rotary plate, and the cutting blade has a blade-free portion having the same outer diameter as the cutting blade itself at one end and the cutting blade at the other end. An outer conductive layer cutting device having a guide roller having a diameter smaller than the outer diameter of the cutting roller so as to be rotatable coaxially with the cutting blade.