JP3201774U - Pipe cutting device - Google Patents

Abstract

To provide a pipe cutting device capable of easily cutting a spiral corrugated pipe in a plane perpendicular to a pipe axis with a desired cutting depth without damaging an inner insulating layer. A circular rotary blade 5 for cutting a flexible tube along an outer peripheral surface, a feed device 6 for supporting the rotary blade and moving in the radial direction of the flexible tube, and supporting the feed device And a cutter support body 4 for guiding the circumference of the flexible tube in the circumferential direction along the guide surface of the cutter guide 3, and the cutter guide is divided into at least two parts so as to form an annular body when connected. And a contact surface that forms a circular inner peripheral surface for closely contacting the outer peripheral surface of the flexible tube and a guide surface that forms a circular outer peripheral surface for guiding the cutter support when connected. The center of the guide surface is eccentric from the center of the contact surface. [Selection] Figure 1

Description

  The present invention is a pipe cutting device for cutting a metal flexible tube having a continuous spiral groove formed on the outer peripheral surface thereof. In particular, the present invention uses a special cutter guide in which the center of the circular outer guide surface is eccentric with respect to the center of the circular inner abutment surface. By reducing the amount of movement of the rotary blade, the cutting of the metal flexible tube is facilitated, and the cutting depth of the rotary blade is easily adjusted so as not to damage the contents inside the flexible tube. A pipe cutting device that can

  Generally, power cables that are buried in the ground or laid in buildings are covered with an insulating layer made of rubber, etc., and the outside is wrapped with a metal protective tube. Is done. Moreover, as a protective tube in which the power cable is accommodated, for example, in order to efficiently dissipate Joule heat generated from the core wire, or to increase flexibility in piping / wiring at the time of construction by improving flexibility, for example, Japanese Patent Application Laid-Open No. 2008-2008. In some cases, a flexible tube having a continuous spiral groove formed on the outer peripheral surface as described in JP-A-71645 (Patent Document 1) may be used.

  By the way, in the case of a power cable covered with a metal protective tube, when connecting to another power cable, etc., only the flexible tube near the tip is cut and removed for a predetermined length, and the core wire is covered. The insulating layer must be exposed without damaging the insulating layer.

  However, in the case of the flexible tube as described above, since a spiral groove having irregularities is formed on the surface of the flexible tube, for example, a pipe as described in JP 2010-115747 A (Patent Document 2). In general pipe cutting machines such as cutting devices and hand saws, the cutting blade cannot be adjusted so that the cutting depth is constant while following the uneven shape of the surface of the flexible tube, and as a result, the core wire is covered. There was a problem of damaging the insulating layer.

  Especially when the flexible tube is made of a hard material such as stainless steel, the cutting resistance of the convex portion on the surface of the flexible tube increases as the cutting depth of the cutting blade increases. There was a problem that cutting was impossible. Also, if the cutting depth of the cutting blade cannot be adjusted accurately, the cutting blade will be forced to bend by the spiral groove formed obliquely with respect to the tube axis, which will eventually generate excessive stress. As a result, there was a problem that the cutting blade was damaged.

  For this reason, in Japanese Utility Model Laid-Open No. 1-101721 (Patent Document 3), a rotationally driven cutter is attached to a main body holding a pipe so as to rotate with respect to the outer peripheral surface of the pipe, and the radius of rotation of the cutter is determined. Even if it is a metal corrugated pipe having a continuous spiral groove on the outer peripheral surface, the corrugated pipe is cut by a plane perpendicular to the pipe axis. Pipe cutting machines that can do this have been developed.

  However, in the pipe cutting machine described in Patent Document 3, if the corrugated pipe has a groove on the outer peripheral surface of the pipe formed in a plane perpendicular to the pipe axis, a constant cutting depth is obtained without damaging the inner insulating layer. Now the pipe can be cut. However, for a spiral corrugated tube having a spiral groove formed in a plane in which the groove on the outer peripheral surface of the pipe is oblique to the tube axis, a constant cutting depth is obtained without substantially damaging the inner insulating layer. There was a problem that the pipe could not be cut.

  Because the pipe cutting machine described in Patent Document 3 can move the first slide frame with the cutting blade fixed in the radial direction of the pipe, the cutting edge of the cutting blade follows the unevenness of the pipe outer peripheral surface. The pipe can be cut. However, in the pipe cutting machine described in Patent Document 3, in order to set the cutting depth by the cutting blade to a desired depth, the relative position of the blade edge with respect to the guide plate (the amount of protrusion of the blade edge from the guide plate) is set in advance. The cutting edge must follow the shape of the pipe outer peripheral surface by bringing the guide plate into contact with the outer peripheral surface of the pipe, and the guide plate has grooves formed as shown in FIG. It is because it was the structure which can be made to follow only the convex part (maximum outer peripheral surface) of a corrugated pipe outer peripheral surface.

  That is, in the pipe cutting machine described in Patent Document 3, the cutting depth of the cutting blade is set based on the convex portion of the pipe outer peripheral surface with respect to the spiral corrugated pipe in which the continuous spiral groove is formed on the outer peripheral surface. Then, since the guide plate is restrained by the convex portion of the pipe outer peripheral surface, the cutting edge does not reach the concave portion of the pipe outer peripheral surface, and on the other hand, if the cutting depth of the cutting blade is set based on the concave portion of the pipe outer peripheral surface, Since the plate is constrained by the convex portion on the outer peripheral surface of the pipe, there is a problem that the cutting edge maintains the cutting depth that reaches the concave portion even in the convex portion on the outer peripheral surface of the pipe, and damages the inner insulating layer of the spiral corrugated pipe. It was.

  Therefore, even in a metal spiral corrugated tube having a continuous spiral groove formed on the outer peripheral surface, the spiral corrugated tube is orthogonal to the tube axis at a desired cutting depth without damaging the inner insulating layer. Development of a pipe cutting device that can be easily cut on a flat surface is awaited.

JP 2008-71645 A JP 2010-115747 A Japanese Utility Model Publication No. 1-101721

  In a metal flexible tube having a continuous spiral groove formed on the outer peripheral surface, that is, a spiral corrugated tube, the spiral corrugated tube is formed with respect to the tube axis at a desired cutting depth without damaging the inner insulating layer. It is an object of the present invention to provide a pipe cutting device that can be easily cut on an orthogonal plane.

  The inventor fixed the cutter guide on the outer peripheral surface of the pipe, and as a result of earnestly examining the pipe cutting device of the type that cuts the pipe by guiding the cutter support provided with a cutting blade to the cutter guide, Uses a special cutter guide whose center of the circular outer guide surface is eccentric with respect to the center of the circular inner contact surface, and reduces the amount of movement of the rotary blade relative to the outer peripheral surface of the spiral corrugated pipe in which the spiral groove is formed As a result, it was found that the spiral corrugated tube can be easily cut along a plane perpendicular to the tube axis without damaging the insulating layer inside the spiral corrugated tube, and the present invention has been completed.

  That is, according to the present invention, there is provided a pipe cutting device for cutting a metal flexible tube (also referred to as a “spiral corrugated tube”) having a continuous spiral groove formed on an outer peripheral surface thereof. A circular rotary blade for cutting the flexible tube along the outer peripheral surface, a feed device for supporting the rotary blade and moving the rotary blade in the radial direction of the flexible tube, and a feed device supporting and supporting the feed device A cutter support for guiding the circumference of the flexible tube along the guide surface of the cutter guide in the circumferential direction, and an annular body at the time of connection for fixing to the outer peripheral surface of the flexible tube A cutter guide divided into at least two parts, wherein the cutter guide has a contact surface that forms a circular inner peripheral surface to be in close contact with the outer peripheral surface of the flexible tube when connected, and a cutter when connected. Circular perimeter for guiding the support And a guide surface forming a and the center of the guide surface pipe cutting apparatus, characterized in that eccentric to the center of the abutment surface is provided.

  In general, for a power cable in which an electric wire covered with rubber or resin is housed, a metal flexible tube having a continuous spiral groove formed on the outer peripheral surface is used as a protective tube. Also, the outer diameter of the metal flexible tube generally used for power cables is φ150 mm to φ250 mm. In this case, the height difference between the concave and convex portions of the spiral groove formed on the outer peripheral surface of the metal flexible tube is It is approximately 3 mm to 15 mm.

  For this reason, when the above-mentioned metal flexible tube is cut along a plane orthogonal to the tube axis, the shape of the cut surface is such that one end passes through the recess of the spiral groove and the other end is the spiral groove. As a whole, a slightly flat circular shape that is eccentric by 3 mm to 15 mm with respect to a perfect circle centered on the tube axis of the metal flexible tube is obtained. The center of the cut surface is also eccentric by 3 mm to 15 mm at the maximum with respect to the tube axis of the metal flexible tube.

  Therefore, in the present invention, in the cutter guide fixed to the outer peripheral surface of the metal flexible tube for guiding the cutter support, the center of the circular guide surface for guiding the cutter support is set at the center of the flexible tube. A cutter guide that is eccentric in advance by an amount corresponding to the amount of eccentricity expected when the flexible tube is cut is used with respect to the center of the circular contact surface for tightly contacting the outer peripheral surface. That is, it is preferable that the eccentric amount of the cutter guide eccentric in advance is 3 mm to 15 mm when the outer diameter of the flexible tube having the spiral groove is φ150 mm to φ250 mm.

  And in this invention, if the cutter guide mentioned above is fixed to the outer peripheral surface of a flexible tube so that it may become parallel to the plane orthogonal to the tube axis of a flexible tube, the circular guide surface for guiding a cutter support body The distance from the outer peripheral surface of the flexible tube, that is, the depth of cutting of the rotary blade with respect to the flexible tube is substantially constant regardless of the presence or absence of the spiral groove on the outer peripheral surface of the flexible tube. For this reason, when the cutter support is moved along the guide surface of the cutter guide attached to the flexible tube, the rotary blade supported by the feeder of the cutter support moves almost in the radial direction of the flexible tube. The flexible tube can be cut without causing it.

  As a result, according to the pipe cutting device of the present invention, a flexible tube having a spiral groove on the outer periphery is orthogonal to the tube axis at a desired cutting depth without damaging the insulating layer inside the flexible tube. Can be cut easily on a flat surface. Therefore, according to the pipe cutting device of the present invention, particularly when an electric wire covered with rubber or resin is accommodated inside the flexible tube, the insulating layer made of rubber or resin inside the flexible tube is damaged. It is possible to obtain a very advantageous effect that the flexible tube can be easily cut without any problems.

  The cutter guide of the present invention is divided into at least two parts so as to form a part of an annular body in order to facilitate fixing the flexible tube to the outer peripheral surface. For example, a cutter guide composed of two half-cracked parts having a semicircular shape. The cutter guide is attached to the flexible tube by aligning the two half-cracked parts on the outer peripheral surface of the flexible tube so as to be parallel to the plane perpendicular to the tube axis of the flexible tube, and then bolt- By connecting the half-cracked parts together by a fastening means such as a nut, the attachment is completed with a circular annular body formed on the outer peripheral surface of the flexible tube. Therefore, the cutter guide may be divided into two or more as long as the cutter guide forms a circular annular body when connected.

  Moreover, it is preferable that the cutter guide of the present invention includes a plurality of protrusions aligned with the spiral groove of the flexible tube when the cutter guide is attached to the flexible tube on the contact surface of the cutter guide. This is because when the cutter guide has the plurality of protrusions, when the cutter guide is mounted on the flexible tube, the cutter guide is aligned with the spiral groove of the flexible tube, so that the cutter guide is This is because it can be easily mounted so as to be parallel to a plane orthogonal to the tube axis of the flexible tube without shifting (moving) on the outer peripheral surface.

  Further, in order to adapt the cutter guide to flexible tubes having a plurality of different outer diameters, a plurality of cutter guides having contact surfaces corresponding to the maximum outer diameter of the flexible tube having a spiral groove on the outer peripheral surface are prepared. Is preferred.

  The cutter support attached to the cutter guide is not particularly limited as long as it has a structure that can be rotated along the guide surface of the cutter guide after being mounted on the cutter guide. You may have. For example, a C-shaped or U-shaped frame covering at least half a circumference of the guide surface of the cutter guide, the frame including at least three or more rollers whose rotational directions are aligned on one plane, and It is preferable that at least one of the rollers is movable in the radial direction of the flexible tube. In the case of a cutter guide having such a configuration, after the two rollers are brought into contact with the guide surface of the cutter guide, the remaining rollers are moved in the radial direction of the flexible tube to come into contact with the guide surface of the cutter guide. The cutter support can be easily set so that it can be smoothly rotated along the guide surface of the cutter guide without falling off the cutter guide.

  There is no restriction | limiting in particular in the shape of a cutting blade for cut | disconnecting a flexible tube, a structure, etc., A well-known thing can be used. However, since the cutting resistance at the time of cutting the flexible tube can be reduced, it is preferable to use a rotatable circular rotary blade as the cutting blade.

  Further, the rotary blade is supported by a feed device for moving the rotary blade in the radial direction of the flexible tube, and the feed device is fixed to the cutter support. Therefore, the rotary blade can be moved in the circumferential direction around the flexible tube along the outer peripheral surface of the flexible tube by the cutter support, and the cutting depth at the time of cutting the flexible tube is finely adjusted by the feeding device. However, the flexible tube can be easily cut.

  Further, the feeding device may be provided with an elastic body made of a coil spring, a plate spring, a disc spring, or an elastic resin for biasing the rotary blade toward the flexible tube. When the feeder is provided with an elastic body for urging the rotary blade, when the cutter support is moved in the circumferential direction around the flexible tube, the feed device finely cuts the cutting depth of the rotary blade by manual operation. There is no need to adjust, and the cutting depth of the rotary blade can be adjusted semi-automatically by the biasing force of the elastic body.

  According to the pipe cutting device of the present invention, in a metal flexible tube having a continuous spiral groove formed on the outer peripheral surface, that is, a spiral corrugated tube, the spiral corrugated tube can be formed in a desired manner without damaging the inner insulating layer. With the cutting depth, it becomes possible to cut easily in a plane perpendicular to the tube axis.

It is a front view of the pipe cutting device of the present invention. It is a rear view of the pipe cutting device shown by FIG. It is a side view of the pipe cutting device shown by FIG. It is the top view and side view of a metal flexible tube which have a spiral groove in an outer peripheral surface. It is the top view and side view of a cutter guide which are shown by FIG. It is the top view and side view of a cutter support body which are shown by FIG.

  Hereinafter, a pipe cutting device according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments shown below, and various modifications can be made without departing from the technical idea of the present invention.

  1 to 3 are schematic views showing a state in which a pipe cutting device 1 according to an embodiment of the present invention is mounted on an outer peripheral surface of a metal flexible tube 2 having a continuous spiral groove. . 1 is a front view of a pipe cutting device 1 according to an embodiment of the present invention, FIG. 2 is a rear view of the pipe cutting device shown in FIG. 1, and FIG. 3 is shown in FIG. It is a side view of a pipe cutting device.

  As can be understood with reference to FIGS. 1 to 3, the pipe cutting device 1 of the present embodiment is formed on the outer peripheral surface of a metal flexible tube 2 (also referred to as “spiral corrugated tube”) having a continuous spiral groove. A cutter guide 3 to be mounted and a cutter support 4 for guiding the circumference of the flexible tube 2 in the circumferential direction along the outer peripheral surface of the cutter guide 3 are configured. The cutter support 4 includes a feeding device 6 for moving the rotary blade 5 in the radial direction of the flexible tube 2, and the feeding device 6 extends along the outer peripheral surface of the flexible tube 2. A circular rotary blade 5 for cutting is rotatably supported.

  In FIG. 4, an electric wire (not shown) covered with rubber or resin is housed inside, and a continuous spiral groove 21 is formed on the outer peripheral surface to which the pipe cutting device 1 of the present embodiment is applied. A plan view (a) and a side view (b) of the metallic flexible tube 2 are shown. The maximum outer diameter d of the flexible tube 2 shown in FIG. 2 is φ150 mm, the pitch p of the spiral groove is 23 mm, and the concave and convex portions of the spiral groove 21 formed on the outer peripheral surface of the flexible tube 2. The height difference h is 5.5 mm.

  As understood with reference to FIG. 4A, when the flexible tube 2 is cut along a plane orthogonal to the tube axis X, the shape of the cut surface is a concave portion of the spiral groove 21. And the other end passes through the convex portion of the spiral groove 21, and as a whole, it is a slightly flattened circular shape that is eccentric about 5.5 mm with respect to a perfect circle centered on the tube axis X of the flexible tube 2. It becomes the shape of. The center Y of the flat circular cut surface is also decentered by about 5.5 mm with respect to the tube axis X of the flexible tube 2.

  FIG. 5 is a plan view (a) of the cutter guide 3 used in the pipe cutting device 1 of the present embodiment with respect to the flexible tube 2 whose center of the cutting surface is eccentric with respect to the tube axis X as described above. A side view (b) is shown.

  As can be understood with reference to FIG. 5, the cutter guide 3 of the present embodiment has a semicircular shape that forms a part of an annular body in order to facilitate fixing the flexible tube 2 to the outer peripheral surface. It is divided into two half-break parts 31, 32. The cutter guide 3 is attached to the flexible tube 2 so that the two half-cracked parts 31 and 32 are parallel to a plane orthogonal to the tube axis X of the flexible tube 2. After being aligned to each other, the half-cracked parts 31 and 32 are connected to each other by the bolt-nut 33 to complete the attachment in a state where a circular annular body is formed on the outer peripheral surface of the flexible tube 2.

  Further, in the cutter guide 3 of this embodiment, when the cutter guide 3 is attached to the flexible tube 2 on the circular contact surface 36 for closely contacting the outer peripheral surface of the flexible tube 2, A plurality of protrusions 38 aligned with the spiral groove 21 are provided. Due to the plurality of projections 38, the cutter guide 3 of this embodiment can be used when the projection 38 of the cutter guide 3 is aligned with the spiral groove 21 of the flexible tube 2 when mounted on the flexible tube. Without shifting (moving) on the outer peripheral surface of the flexible tube 2, it can be easily attached so as to be parallel to a plane orthogonal to the tube axis X of the flexible tube 2.

  In the cutter guide 3 of this embodiment, when the two half-break parts 31 and 32 are connected, the center 35 of the circular guide surface 34 for guiding the cutter support 4 described later is the outer periphery of the flexible tube 2. The center 37 of the circular contact surface 36 for closely contacting the surface is designed to be decentered in advance by an amount corresponding to the amount of eccentricity L expected when the flexible tube is cut. That is, in the cutter guide 3 of the present embodiment, the preferable eccentric amount L is 5.5 mm. However, since the cutter guide 3 of the present embodiment is used by connecting the two half-breaking parts 31 and 32, the substantial eccentricity L can be finely adjusted by the connecting bolt-nut 33, so that FIG. The eccentric amount L of the cutter guide 3 shown in (a) is 3.4 mm.

  In the pipe cutting device 1 according to the present embodiment, the cutter guide 3 is fixed to the outer peripheral surface of the flexible tube 2 so as to be parallel to a plane orthogonal to the tube axis X of the flexible tube 2. The distance from the circular guide surface 34 for guiding the body 4 to the outer peripheral surface of the flexible tube 2, that is, the cutting depth of the rotary blade 5 with respect to the outer peripheral surface of the flexible tube 2 is the same as that of the outer peripheral surface of the flexible tube 2. It is substantially constant regardless of the presence or absence of the spiral groove 21. For this reason, when the cutter support 4 is moved along the guide surface 34 of the cutter guide 3 attached to the flexible tube 2, the rotary blade 5 supported by the feeding device 6 of the cutter support 4 becomes flexible tube 2. The flexible tube 2 can be cut with little movement in the radial direction.

  As a result, according to the pipe cutting device 1 of the present embodiment, the flexible tube having the spiral groove 21 on the outer periphery with a desired cutting depth without damaging the insulating layer (not shown) inside the flexible tube 2. 2 can be easily cut by a plane orthogonal to the tube axis X. Therefore, according to the pipe cutting device 1 of the present embodiment, the flexible tube 2 is made of rubber or resin inside the flexible tube 2 particularly when the wire covered with rubber or resin is accommodated inside the flexible tube 2. A very advantageous effect that the flexible tube 2 can be easily cut without damaging the insulating layer can be obtained.

  Although not shown, when it is necessary to adapt the pipe cutting device 1 of this embodiment to the flexible tube 2 having a plurality of different outer diameters, the maximum of the flexible tube 2 having the spiral groove 21 on the outer peripheral surface is provided. It is preferable to prepare a plurality of cutter guides 3 having a contact surface 36 corresponding to the outer diameter.

  FIG. 6 shows a plan view (a) and a side view (b) of the cutter support 4 guided in the circumferential direction around the flexible tube 2 along the guide surface 34 of the cutter guide 3.

  As can be understood with reference to FIG. 6, the cutter support 4 of the present embodiment includes a C-shaped or U-shaped frame 41 covering at least a half circumference of the guide surface 34 of the cutter guide 3. Includes two roller adjusting devices 43 and 44 that rotatably support the two rollers 42, and a handle 45 for rotating the frame 41 on the guide surface 34 of the cutter guide 3. Further, the roller adjusting devices 43 and 44 that support the two rollers 42 are disposed at positions facing each other in the C-shaped or U-shaped frame 41.

  Among the two roller adjusting devices 43, 44, one roller adjusting device 43 includes a fixing plate 46 that supports the two rollers 42, and two threaded knobs 47 for fixing the fixing plate 46 to the frame 41. I have. The frame 41 includes two slits 48 that engage with the two threaded knobs 47, whereby the fixing plate 46 is attached to the frame 41 so as to be slidable in the radial direction of the flexible tube 2. The other roller adjusting device 44 is attached to the frame 41 via a fixed plate 46 that supports the two rollers 42 so as not to slide in the radial direction of the flexible tube 2.

  Therefore, the cutter support 4 according to this embodiment can be mounted on the cutter guide 3 without being slidable in the radial direction of the flexible tube 2 to the guide surface 34 of the cutter guide 3 mounted on the outer peripheral surface of the flexible tube 2. After the roller 42 of the roller adjusting device 44 attached to the roller is brought into contact, the roller 42 of the roller adjusting device 43 attached so as to be slidable in the radial direction of the flexible tube 2 is further moved to guide the cutter guide 3. By making contact with the surface 34, the cutter support 4 can be easily set so as to be able to smoothly rotate along the guide surface 34 of the cutter guide 3 without dropping from the cutter guide 3 (FIGS. 1 to 3). reference).

  The rotary blade 5 mounted on the cutter support 4 is supported by a feeding device 6 for moving the rotary blade 5 in the radial direction of the flexible tube 2 by screwing and retracting the bolt shaft 61. The feeding device 6 is fixed to the cutter support 4. Accordingly, the rotary blade 5 can be moved in the circumferential direction around the flexible tube 2 along the outer peripheral surface of the flexible tube 2 by the cutter support 4, and the cutting depth is finely adjusted by the feeding device 6 at the time of cutting. However, the flexible tube 2 can be easily cut.

  Although not shown in the present embodiment, the above-described feeding device 6 includes an elastic body made of a coil spring, a leaf spring, a disc spring, or an elastic resin for urging the rotary blade 5 toward the flexible tube 2. It can also be arranged. When an elastic body for urging the rotary blade 5 is provided on the feeding device 6, when the cutter support 4 is moved around the flexible tube 2 in the circumferential direction, the rotary blade 5 is manually moved by the feeding device 6. There is no need to finely adjust the cutting depth of the blade, and the cutting depth of the rotary blade can be adjusted semi-automatically by the biasing force of the elastic body.

1 ··· Pipe cutting device 2 ·····························································································・ ・ ・ ・ Cutter guides 31 and 32 ・ Semi-cracked parts 33 ・ ・ ・ ・ ・ ・ Bolts and nuts 34 ・ ・ ・ ・ ・ ・ Guide surface 35 ・ ・ ・ ・ ・ ・ Center of guide surface 36 ・ ・ ・ ・・ ・ Contact surface 37 ・ ・ ・ ・ ・ ・ Center of contact surface 38 ・ ・ ・ ・ ・ ・ Projection 4 ・ ・ ・ ・ ・ ・ Cutter support 41 ・ ・ ・ ・ ・ ・ Frame 42 ・ ・ ・ ・ ・ ・Roller 43, 44 ... Roller adjustment device 45 ... Handle 46 ... Fixing plate 47 ... Screwed knob 48 ... Slit 5 ...・ ・ Rotary blade 6 ・ ・ ・ ・ ・ ・ Feeder 61 ・ ・ ・ ・ ・ ・ Bolt shaft

Claims (6)

A pipe cutting device for cutting a metal flexible tube having a continuous spiral groove formed on the outer peripheral surface,
A circular rotary blade for cutting the flexible tube along the outer peripheral surface of the flexible tube;
A feed device for supporting the rotary blade and moving the rotary blade in a radial direction of the flexible tube;
A cutter support for supporting the feeder, guiding the feeder circumferentially around the flexible tube along the guide surface of the cutter guide, and fixing the feeder to the outer peripheral surface of the flexible tube A cutter guide configured to form an annular body at the time of connection and divided into at least two parts, wherein the cutter guide has a circular inner periphery for closely contacting the outer peripheral surface of the flexible tube at the time of connection. A contact surface that forms a surface, and a guide surface that forms a circular outer peripheral surface for guiding the cutter support when connected, and the center of the guide surface is the center of the contact surface A pipe cutting device characterized by being eccentric.   The pipe cutting device according to claim 1, wherein an electric wire covered with rubber or resin is accommodated in the flexible tube.   3. The pipe cutting device according to claim 1, wherein when the maximum outer diameter of the flexible tube is φ150 mm to φ250 mm, the eccentric amount is 3 mm to 15 mm.   2. A plurality of protrusions are formed on the contact surface of the cutter guide so as to align with a spiral groove of the flexible tube when the cutter guide is mounted on the flexible tube. 4. The pipe cutting device according to any one of 3 to 3.   The cutter support includes at least three or more rollers whose rotational directions are aligned on one plane, and at least one of the rollers is movable in the radial direction of the flexible tube. The pipe cutting device according to any one of claims 1 to 4, characterized in that:   The pipe cutting device according to any one of claims 1 to 5, wherein the feeding device includes an elastic body that urges the rotary blade toward the flexible tube.

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