JP6018816B2 - Hose cutting device and hose cutting method - Google Patents

Description

  The present invention provides a hose support portion that supports a hose, a disk-shaped cutter having a blade portion formed around it, and a relative displacement that causes the hose support portion and the cutter to be spaced apart from each other and to approach each other. The present invention relates to a hose cutting device and a hose cutting method.

  This type of hose cutting device is, for example, a tubular structure made of rubber material, resin material or other elastic material, and a spiral structure formed by winding a metal wire between inner and outer elastic layers, or the wire May be used for cutting a hose that is formed by interposing one or more reinforcing layers such as a blade structure by weaving, and functions to feed hydraulic oil and other fluids used in construction machines and the like.

  In using such a hose cutting device, generally, a hose as described above is supported by a hose support part, and is in a disk-like state in which the hose is rotated by applying a driving force from a motor or the like. The hose can be cut almost perpendicularly to the longitudinal direction of the cutter by bringing the hose closer to the cutter by manual operation and pressing the hose against the blade formed around the cutter. .

By the way, Patent Document 1 discloses that “a cutting object placing means and a cutting means arranged so as to be movable so as to face the placing means. And a cutting device characterized in that it comprises a workpiece mounting table configured to be capable of avoiding rotation.
And, in this “cutting device”, “the cutter is formed in a disk shape, and the blade formed on the entire circumference of the cutter is divided into a group of blades formed by a plurality of blades, and each of the divided blades is divided. It is described that it is preferable that the clam angle of each blade constituting the blade group as a whole exhibits an arrowhead shape in the rotational direction. According to this, “a rubber-like elastic body or resin Effective for cutting products, paper products, wood, etc. "

Japanese Patent Laid-Open No. 10-58387

However, in the “cutting device” described in Patent Document 1, the outer peripheral edge of the cutter provided around the cutter in order to form the “blade group formed with a plurality of blades” is provided around the cutter. As shown in the drawing, the plurality of slits that open extend along the radial direction of the cutter, or in the inner peripheral side portion rather than the outer peripheral side portion of the slit with respect to the radial direction of the cutter. When the hose formed by embedding the above reinforcing layer is cut, the slits provided around the rotationally driven cutter are There is a problem in that the wire constituting the reinforcing layer is caught on the wire, thereby causing the wire constituting the reinforcing layer to be scattered on the cut surface of the hose after cutting, leading to deterioration of the properties of the hose cut surface.
Further, due to the catching of the slit, a hose having a particularly strong reinforcing layer having a spiral structure may not be cut by the above-mentioned “cutting device”.

  An object of the present invention is to solve such problems of the prior art, and the object of the invention is a hose in which a reinforcing layer having, for example, a spiral structure is embedded. However, the present invention provides a hose cutting device and a hose cutting method that can be easily cut and that can effectively prevent deterioration of the cut surface properties of the hose after cutting.

The hose cutting device according to the present invention includes a hose support portion that supports the hose, a disk-shaped cutter that is formed with a blade portion around the hose, and that can be driven to rotate. And a relative displacement means to be used for cutting a hose having an elastic layer made of an elastic material and a reinforcing layer, and is open to the outer peripheral edge of the cutter. A plurality of slits extending toward the inner peripheral side, and each of the slits is directed to the front side in the rotation direction of the cutter at the inner peripheral side portion relative to the outer peripheral side portion of the slit with respect to the radial direction of the cutter. with tilting Te, of the slit, the angle of inclination with respect to the radial direction of the cutter, Ri Do a range of 30 ° to 80 °, a plurality of the slit, the outer periphery of the cutter Length from edge and two kinds to each other, the two types of the respective slits is shall such arranged alternately in the rotation direction of the cutter.

Hose cutting apparatus of the invention, the hose disconnect object, it is preferable that the one having a reinforcing layer composed of a wire extending in a spiral shape.

Further, the hose cutting method of the present invention is an elastic layer made of an elastic material and a hose having a reinforcing layer in a state of supporting a hose having a reinforcing layer, and rotating and rotating the disk-shaped cutter close to each other. A hose cutting method for cutting the hose by pressing a blade portion formed around the cutter against the hose, wherein the blade portion of the cutter opens to the outer peripheral edge of the cutter and is on the inner peripheral side. slit with a plurality of provided extending, each of the slits, with respect to the radial direction of the cutter, in the circumferential direction the same direction of the cutter, is inclined in the range of 30 ° to 80 °, a plurality of the slit The lengths from the outer peripheral edge of the cutter are two different types, and the two types of slits are alternately arranged in the direction of rotation of the cutter, However, the blade of the cutter is pressed against the hose while the cutter is driven to rotate in the direction toward the front side in the rotation direction of the cutter at the inner peripheral side portion relative to the outer peripheral side portion of the slit. Then, the hose is cut.

  According to the hose cutting device of the present invention, each of the plurality of slits provided in the blade portion of the cutter is rotated at the inner peripheral side portion of the slit with respect to the radial direction of the cutter. By tilting toward the front side of the direction, even a hose in which a spiral reinforcing layer, for example, is embedded, can be easily cut without being caught on the wire. Moreover, deterioration of the cut surface properties of the hose after cutting can be effectively prevented.

Here, in the hose cutting device according to the present invention, in particular, the inclination angle of the slit with respect to the radial direction of the cutter is set in the range of 30 ° to 80 °, so that the required strength of the cutter is secured and the hose is cut. In this case, it is possible to surely prevent the slit from being caught on the wire of the reinforcing layer, and thus the deterioration of the properties of the cut surface of the hose after cutting, and also to easily cut the hose having the reinforcing layer having the spiral structure. be able to.
In other words, when the angle of inclination of the slit is less than 30 °, due to the small angle of inclination, the wire of the reinforcing layer of the hose is caught in the slit when the hose is cut. The wire arrangement is disturbed at the hose cut surface, and the properties of the cut surface deteriorate. On the other hand, when the inclination angle of the slit exceeds 80 °, the slit is greatly inclined with respect to the radial direction of the cutter so that the blade blade portion of the cutter is close to the outer peripheral edge. This leads to a decrease in strength.

In addition, by using a plurality of slits having different lengths from the outer peripheral edge of the cutter, the slits of the cutter are worn as the cutter blade wears with use of the hose cutting device. Among them, since the slit having a relatively short length disappears first, it is possible to easily grasp the replacement time of the cutter before falling into a state in which cutting is impossible due to disappearance of all the slits.

Here in particular, the slits of the plurality of, and two with a length different from each other from the outer peripheral edge of the cutter, each of these two types of slits, by arranging alternately in the rotational direction of the cutter Compared to the case where three or more types of slits are provided or the case where two types of slits are not arranged alternately, the strength of the cutter blade portion is made uniform over the entire circumference of the cutter with the required size. The cutter can be used for a sufficiently long period, and the replacement time after use can be easily grasped by the disappearance of the relatively short slit.

  By the way, when the hose to be cut has a reinforcing layer composed of a wire extending in a spiral shape, the hose that may not be cut by other hose cutting devices can be reliably cut, Further, the cut surface can be made good without the wires being scattered.

  Further, according to the hose cutting method of the present invention, each of the slits provided in the blade portion of the cutter is an inner peripheral side portion with respect to the outer peripheral side portion of the slit, and faces the front side in the rotation direction of the cutter. The hose is formed by embedding a reinforcing layer having a spiral structure, for example, by cutting the hose by pressing the blade portion of the cutter against the hose while rotating the cutter. However, the slit can be easily cut without being caught on the wire, and deterioration of the cut surface property of the hose after cutting can be effectively prevented.

It is a perspective view showing one embodiment of the hose cutting device of this invention. It is a front view of the cutter removed from the hose cutting device shown in FIG. It is a front view which expands and shows a part of circumferential direction of the cutter shown in FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. It is a front view of the hose cutting device which shows the other fixed aspect of a hose in the hose cutting device of FIG. It is a graph which shows the relationship between the number of the hose cut | disconnected using each of an Example apparatus and a comparative example apparatus, and the outer diameter of a hose cut surface.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
A hose cutting device 1 illustrated in FIG. 1 includes, for example, a plate-like support base 2 and a hose support portion 3 that is formed on the support base 2 on the front side of the figure and supports a flexible hose 50. , A drive source 4 such as a motor, a disk-shaped cutter 5 that is driven to rotate based on the application of a rotational drive force from the drive source 4, and the hose support 3. And a relative displacement means 6 for separating and approaching the cutter 5 from each other.

  Here, the plate-like support base 2 is provided with a pair of leg portions 2b extending on the lower side of the figure on both sides of the flat plate-like main body portion 2a, and both the leg portions 2b are disposed on the installation surface. It is assumed that the plate-like member 2c having a substantially “T” shape disposed on the upper surface is joined by welding or the like. The support base 2 includes the hose support portion 3 and the cutter 5 described above. If it can support etc., it will not be limited to the form of illustration.

  Further, here, the hose support portion 3 includes, for example, six fixed rod-shaped fixing rods 3a, 3b, and 3c having a circular cross-section formed on the front surface of the main body portion 2a of the support base 2 in the drawing. It can comprise by arranging in 2 width direction. As shown in the figure, of the six fixed rods 3a to 3c, the two fixed rods 3a positioned on the center side in the width direction of the support base 2 are positioned outside the width direction. By arranging them at a slightly higher position on the upper side of the figure than the four fixed rods 3b and 3c, here, the fixed rods 3a on the center side and the fixed rods 3b adjacent to the outside thereof are arranged. In the meantime, as shown in the figure, the hose 50 can be sandwiched, and the hose 50 can be fixed in a state of being bent and elastically deformed in an inverted “U” shape in front view of the apparatus 1.

In this embodiment, one end side is attached to the drive source 4 so as to surround the periphery of the hose support portion 3 and the cutter 5 as a relative displacement means 6 for separating and approaching each other. The arm member is hinged to the support base 2 so as to be pivotable on the back side of the figure.
Thereby, in this hose cutting device 1, the above-described arm member 6 as the relative displacement means is manually rotated and displaced, for example, so that the cutter 5 attached to the arm member 6 via the drive source 4 is shown in FIG. 1, as indicated by an arrow, the hose support 3, more directly, a notch that is fixed to the hose support 3 as described above and provided in the upper central region of the main body portion 2 a of the support 2. The curved portion of the hose 50 located in the portion 2d can be separated and approached.

  As the relative displacement means, in addition to the arm member 6 hinged to the support base 2 as described above, for example, a piston, a rack and pinion, a ball screw, etc. (not shown) by applying a driving force can be used. The relative displacement means is not shown in the figure, but the hose support part is separated / approached to the fixed cutter, and both the hose support part and the cutter are separated / approached from each other. can do.

  Here, around the disk-shaped cutter 5 which can be formed of high-speed tool steel (SKH51 or the like), cemented carbide alloy steel or alloy tool steel or other metal material, FIG. As shown in a state removed from the blade 5, a blade portion 5 a that is pressed against the hose 50 when the hose is cut by the hose support device 1 is formed, and the blade portion 5 a opens to the outer peripheral edge E of the cutter 5. A plurality of slits 7 extending linearly, for example, along the circumferential direction of the cutter 5 are provided toward the inner peripheral side. In the present invention, each of the slits 7 is provided with respect to the radial direction of the cutter 5. The inner peripheral side portion of the slit 7 (the end of the slit 7 on the inner peripheral side of the cutter) than the outer peripheral side portion of the slit 7 (the portion of the slit 7 close to the opening to the outer peripheral edge E) In the near portion), the cutter 5, with tilting toward the front side in the rotational direction X shown by an arrow in FIG. 2, the inclination angle θ of the slit 7, in the range of 30 ° to 80 °.

  According to this, when the hose 50 having the spiral layer or the blade structure reinforcing layer is cut using the hose cutting device 1, the slit 7 of the cutter 5 driven to rotate by the drive source 4 is The hose 50 can be easily cut without being caught on the wire of the reinforcing layer 50, and the deterioration of the properties of the cut surface of the hose after cutting due to the catch of the slit 7 on the wire is effectively prevented. can do.

  Here, from the viewpoint of effectively preventing the catch of the slit 7, it is preferable to increase the inclination angle θ of the slit 7 with respect to the radial direction of the cutter 5. On the other hand, as the inclination angle θ of the slit 7 is increased, the entire slit 7 is positioned closer to the outer peripheral edge E of the cutter 5, so that the slit 7 and the outer peripheral edge of the cutter blade portion 5 a are arranged. Since the strength of the portion sandwiched by E decreases, the inclination angle θ of the slit 7 is set to 80 ° or less, preferably 40 ° or less in order to ensure the required strength of the blade portion 5a.

In measuring the inclination angle θ of the slit 7, as shown in an enlarged view in FIG. 3, the width center point of the slit 7 at the position of the outer peripheral edge E of the cutter 5 in a front view of the cutter 5. It is assumed that the inclination angle of the straight line R passing through C1 and the width center point C2 of the slit 7 on the inner peripheral side of the cutter 5 with respect to the radial direction of the cutter 5 is measured. This is not shown in the figure, but the slit is at least partially curved or extended at least at one place, or when the width changes toward the inner periphery of the cutter, etc. The same is true.
In the illustrated cutter 5, the end of the slit 7 on the inner peripheral side of the cutter is rounded and terminated, but this end of the slit 7 can be sharpened and terminated on the inner peripheral side of the cutter. .

  Further, here, in order to make the strength of the blade portion 5a of the cutter 5 uniform over the entire circumference of the cutter 5, all of the plurality of slits 7 are equally inclined as shown in FIGS. It is preferable to incline at θ.

  2 and 3, two types of slits 7a and 7b having different lengths La and Lb from the outer peripheral edge E of the cutter 5 are alternately arranged in the rotation direction X of the cutter 5. Yes. According to this, when the cutter 5 is used, the outer peripheral edge E of the cutter 5 is worn down to the position indicated by the phantom line Ev in FIG. 3, for example, and the short slit 7 b disappears. However, the cutter 5 can be used for cutting the hose 50 by the long slit 7a still remaining, and the replacement time of the cutter 5 can be easily grasped by the disappearance of the short slit 7b. Can do.

Even when the slit is made of three or more types having different lengths, it is possible to easily grasp the replacement time of the cutter, but the strength of the cutter blade portion 5a is made uniform in the circumferential direction of the cutter. From the viewpoint, it is preferable to provide the cutter blade 5a with two types of slits 7a and 7b having different lengths La and Lb as shown in the drawing.
Here, the length La of the long slit 7a can be, for example, about 6 mm to 10 mm, and the length Lb of the short slit 7b can be, for example, 3 mm to 5 mm. It is preferable that the length La of the long slit 7a is twice the length Lb of the short slit 7b.

  As described above, the lengths La and Lb of the slits 7a and 7b are, as shown in FIG. 3, the width center point C1 of the slit 7 at the outer peripheral edge E position of the cutter 5 in a front view of the cutter 5, and This means the shortest distance between the slit 7 and the width center point C2 at the end on the inner peripheral side of the cutter 5, and this is a form that extends in a curved or bent manner as described above, The same applies to a slit (not shown) such as a form in which the width changes.

  In addition, although the illustration of a plurality of slits provided in the cutter blade portion is omitted, the length from the outer peripheral edge E of the cutter 5 may be uniform. In the case where the slits have the same length, the length of the slit can be, for example, about 3 mm to 10 mm. If any of the slits has a relatively short length of, for example, 5 mm or less, the strength of the cutter 5 can be easily maintained. On the other hand, if any slit has a relatively long length, for example, more than 5 mm, the replacement frequency of the cutter 5 can be reduced, and continuous use for a long period of time becomes possible.

Here, the blade portion 5a of the cutter 5 includes, for example, a base region Ab whose slope with respect to the thickness center line T of the cutter 5 is relatively gentle, as shown in a sectional view in FIG. The gradient of the surface of the cutter 5 with respect to the thickness center line T can be constituted by a tip region Ae that is relatively steep compared to that of the base region Ab.
In this case, in the cross section shown in the figure, the acute angle α formed by the thickness center line T and the surface contour line of the cutter 5 in the base region Ab is preferably in the range of 1 ° to 10 °. The similar angle β in the tip end region Ae is preferably in the range of 5 ° to 45 °. In particular, the angle α is 2 ° and the angle β is 20 °. Also, here, the length of the blade 5a in the radial direction of the cutter 5 is 20 mm, the similar length of the tip end region Ae is 0.92 mm, the similar length of the base region Ab is 19.08 mm, The outer diameter is 200 mm.
However, the formation of the base region Ab and the tip region Ae having different gradients is not an essential configuration for the present invention.

In such a cutter 5, the number of slits 7 in the range of 50 to 120 is preferably set according to the size of the outer diameter of the cutter 5 over the entire circumference of the cutter 5 having an outer diameter of 150 mm to 500 mm. It is preferable to increase / decrease and provide at equal intervals.
When the outer diameter of the cutter 5 exceeds 500 mm, it is necessary to further increase the capacity of a drive source such as a motor that rotates the cutter 5, and when the outer diameter is less than 150 mm For example, there is a case where it is difficult to cut the hose 50 which is an object to be cut, which has an outer diameter of about 37.4 mm. More preferably, the outer diameter of the cutter 5 is set to 180 mm to 410 mm.

  Although not shown in the drawings, the cutter 5 is provided on at least one side of the outer peripheral side portion of each slit 7 provided around the blade portion 5a, preferably on the side on the rear side in the rotational direction X. By providing a tip portion that can be formed of a metal material having a hardness higher than 5, a so-called tip cutter can be obtained.

  By the way, as shown in FIG. 1, the protective cover 8 which wraps the circumference | surroundings of the blade part 5a of the cutter 5 is provided in the outer peripheral side of the cutter 5, exposing the part pressed against the hose 50 of the cutter blade part 5a. Thus, the operator can be protected from the cutter 5 that is rotationally driven at a speed of, for example, 1000 rpm or more, generally about 4300 rpm.

  The hose cutting device 1 described above is configured by braiding a wire made of a metal material between a tube-like inner elastic layer and an outer elastic layer made of, for example, a rubber material, a resin material, or other elastic material. When used for cutting the hose 50 having at least one reinforcing layer having a spiral structure in which wires are spirally extended together with at least one reinforcing layer having a blade structure or instead of the reinforcing layer having the blade structure. Such a hose 50, which may not be cut by other hose cutting devices, is particularly effective in that it can be cut easily and with a good cut surface.

  Such a hose 50 can be fixed to the hose support part 3 of the hose cutting device 1 in the mode shown in FIG. 1 according to the size of the outer diameter, as shown in a front view in FIG. Among the six fixed rods 3a to 3c, the fixed rod 3c located on the outermost side in the width direction (left and right direction in FIG. 5) of the support base 2 and the fixed rod 3b adjacent to the inner side in the width direction thereof The hose 50 can be sandwiched and fixed between the two.

  Then, when cutting the hose 50 with the hose cutting device 1, for example, a plurality of slits 7 provided in the cutter 5 are located on the inner peripheral side portion of the slit 7 on the inner peripheral side portion as shown in FIG. The cutter 5 is rotationally driven at a required speed in a direction facing the front side of the rotation direction X of the cutter indicated by the arrow, and then the cutter 5 is moved close to the hose 50 fixed as described above, and This can be done by pressing the blade portion 5a of the cutter 5 against the hose 50.

  Next, the hose cutting device according to the present invention was prototyped and its performance was evaluated.

  The embodiment apparatus 1 has the structure shown in FIGS. 1 and 2, and each of the 70 slits provided over the entire circumference of the cutter blade having an outer diameter of 200 mm has an outer periphery of the slit in the radial direction of the cutter. It was made to incline at 40 degrees in the inner peripheral side part rather than the side part toward the front side of the rotation direction of a cutter. In this embodiment apparatus 1, as shown in FIG. 2, the slits are of two types whose lengths from the outer peripheral edge of the cutter are different from each other, and the longer one of them has a length La of 10 mm, which is shorter. The slit length Lb was 5 mm.

The example apparatus 2 is provided with 24 slits of one kind having a length of 5 mm, and the example apparatus 3 is provided with 100 slits of one kind having a length of 3 mm. Thus, the configuration is the same as that of the example device 1. Example apparatus 4 was configured in the same manner as Example apparatus 1 except that 100 slits of one type having a length of 3 mm were provided over the entire circumference of the blade portion of the cutter having an outer diameter of 216 mm. The example device 5 has the same configuration as the example device 1 except that the inclination angle of each slit is set to 60 °.
On the other hand, the comparative example apparatus 1 is implemented except that the cutter blade part is not provided with slits, and the comparative example apparatus 2 is implemented except that the inclination angle of each slit provided in the blade part is 10 °. The configuration is the same as that of the example device 1.
Table 1 shows the specifications of these devices.

When the hoses of various sizes and structures were cut using each of the above devices, the comparative devices 1 and 2 had one or two reinforcing layers having a blade structure made of a metal wire and had an inner diameter of 6 mm to 25 mm. Although the hoses of each size could be cut, the arrangement of the wires was disturbed by the cut surfaces, and in particular, the comparative device 1 could not cut the hose having a spiral structure reinforcing layer made of metal wire. It was.
On the other hand, in Example apparatus 1-5, it has not only the hose of each size 6 mm-25 mm in diameter which has the reinforcement layer of the said blade structure, but four diameters of the reinforcement layer of the said spiral structure. However, even hose sizes of 12 mm to 25 mm could be cut, and the wires were not disturbed on the cut surfaces.

In addition, using each of the above-described Example apparatuses 1, 4 and 5 and Comparative Example apparatus 2, 100 hose (4W / S) having a hose outer diameter of 37.4 mm was cut at a time, and after cutting, The outer diameter of the cut surface that was crushed and expanded by cutting was measured at the most dispersed part of the embedded wire in the circumferential direction of the cut surface. The measurement results are shown in a graph in FIG. 6, and the maximum and minimum values of the cut surface outer diameter and the standard deviation of the cut surface outer diameter of 100 cut hoses are shown in Table 2.
In Example device 5, the cutting edge of the blade portion was worn after several hoses were cut, and therefore the maximum value, the minimum value, and the standard deviation thereof are not shown in Table 2.

As is apparent from the results shown in FIG. 6, the example devices 1, 4 and 5 in which the slit inclination angle is in the range of 30 ° to 80 ° are compared with the comparative example device 2 which is out of the range. Thus, it is understood that the wire arrangement disorder on the cut surface is small.
Therefore, according to the hose cutting device of the present invention, even a hose in which a reinforcing layer having a spiral structure is embedded can be easily cut, and the cut surface property of the hose after cutting is deteriorated. It was found that can be effectively prevented.

DESCRIPTION OF SYMBOLS 1 Hose cutting device 2 Support stand 2a Body part 2b Leg part 2c Plate-like member 2d Notch part 3 Hose support part 3a-3c Fixed rod 4 Drive source 5 Cutter 5a Blade part 6 Arm member (relative displacement means)
7 Slit 7a Long slit 7b Short slit 50 Hose E Cutter outer circumference Ev Cutter outer circumference after a certain amount of wear La, Lb Slit length C1, C2 Slit width center point θ Slit radius of cutter Inclination angle with respect to direction Ab Base region of the blade portion Ae Tip region of the blade portion T Thickness center line α Angle formed by the thickness center line and the surface contour of the cutter in the base region β Thickness center line in the tip region Between the cutter and the surface contour of the cutter

Claims (3)

A hose support portion for supporting the hose, a disk-shaped cutter having a blade portion formed around the hose, and a relative displacement means for separating and approaching the hose support portion and the cutter away from each other. A hose cutting device provided for cutting a hose having an elastic layer made of an elastic material and a reinforcing layer,
The blade portion of the cutter is provided with a plurality of slits that open to the outer peripheral edge of the cutter and extend to the inner peripheral side, and each of the slits is more than the outer peripheral side portion of the slit in the radial direction of the cutter. in the inner peripheral portion, together with the tilting toward the front side in the rotational direction of the cutter, of the slit, the angle of inclination with respect to the radial direction of the cutter, Ri Do a range of 30 ° to 80 °,
The slit of the plurality of, and two different lengths from each other from the outer peripheral edge of the cutter, the two types of respectively, Ru hose cutting device name arranged alternately in the rotation direction of the cutter of the slit. The hose cutting device according to claim 1, wherein the hose to be cut has a reinforcing layer composed of a wire extending in a spiral shape. In a state where an elastic layer made of an elastic material and a hose having a reinforcing layer are supported, a disk-shaped cutter that is rotationally driven and the hose are moved close to each other to form a blade portion formed around the cutter. A hose cutting method for cutting the hose by pressing against the hose,
The blade portion of the cutter is provided with a plurality of slits that open to the outer peripheral edge of the cutter and extend to the inner peripheral side, and each of the slits is the same in the circumferential direction of the cutter with respect to the radial direction of the cutter. The slits are inclined in the range of 30 ° to 80 °, and the plurality of slits are two types having different lengths from the outer peripheral edge of the cutter, and each of the two types of slits is formed on the cutter. Alternatingly arranged in the rotation direction,
Each of the slits is an inner peripheral side portion of the slit, and the cutter portion is rotated in a direction facing the front side in the rotation direction of the cutter while the blade portion of the cutter is moved to the hose. A hose cutting method in which the hose is cut against the hose.

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