JP2016203279A - Rotary cutter, cutting device and hose cutting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a rotary cutter that is able to cut a hose easily, a cutting device and a hose cutting structure.SOLUTION: A rotary cutter 10 is provided so as to be rotatable, and has a disc-like rotary cutter body 12 having on its peripheral edge part a blade edge 14 with inclined faces 14A on both sides such that a cross-section has a pointed shape toward radial outside, and configured to cut a hose 60 with the blade edge 14. Furthermore, in a radially inside area 12B adjacent to the blade edge 14 on both sides of the rotary cutter body 12, the rotary cutter 10 has a plurality of groove parts 16 arranged on the radially inside of the rotary cutter body 12 and at intervals in a circumferential direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotary blade, a cutting device, and a hose cutting structure.

  The following Patent Document 1 uses a cutting blade formed in a saw blade shape, and cuts the food wrap film by bringing the cutting blade into contact with the food wrap film laid in a plane so as to be substantially orthogonal. A configuration is disclosed.

  Patent Document 2 below discloses a vegetable cutting machine that includes a single-edged blade surface that is inclined toward the rotary shaft so that the cross-section of the rotating blade has a trapezoidal shape, and cuts the vegetable with the single-edged surface by the rotation of the rotary blade. Has been.

JP 2013-28351 A Utility Model Registration No. 3173013

  The cutting blade described in the above cited document 1 is used for a purpose of cutting a food wrap film, and the rotary blade described in the above-mentioned patent document 2 is used for a purpose of cutting vegetables. As described above, when cutting a cylindrical hose, it is difficult to apply the above-described cutting blade and rotating blade as they are.

  For example, when a hose is cut in a direction perpendicular to the axial direction using a rotary blade, a pressing force is generated on the blade edge from both sides of the cut portion due to the repulsive force of the hose (the restoring force of the hose itself). Furthermore, since the hose has a cylindrical shape, the more the hose is cut in the direction perpendicular to the axial direction of the hose from the outer peripheral surface of the hose, the more the area of pressing increases. For this reason, when a hose is cut using a rotary blade, the rotary blade cannot maintain its original rotation due to the large frictional force between the rotary blade and the hose, and the rotary blade may vibrate greatly. In particular, in the case of a hose having a reinforcing layer and a hose with a large diameter (thickness), the restoring force of the hose itself is large, the pressing force acting on the blade edge of the rotary blade is large, and it is difficult to cut.

  This invention is made | formed in view of the said problem, and it aims at providing the rotary blade which can cut | disconnect a hose easily, a cutting device, and a hose cutting structure.

  In order to solve the above-mentioned problems, the rotary blade according to the invention described in claim 1 is a rotary blade for cutting a hose, is provided rotatably, and has a cross section at the peripheral portion in a radially outward direction. A disk-shaped rotary blade body that includes a blade edge with inclined surfaces formed on both sides so as to have a pointed shape, and a radially inner side adjacent to the blade edge on both surfaces of the rotary blade body. And a plurality of grooves provided at intervals in the circumferential direction while being arranged radially inward of the rotary blade body.

  According to the first aspect of the present invention, the rotary blade includes a disk-shaped rotary blade body that is rotatably provided, and the cross-section of the rotary blade body has a sharp point toward the outer side in the radial direction. It has a cutting edge with inclined surfaces formed on both sides to form a shape. Furthermore, the rotary blade is provided with a plurality of groove portions that are arranged radially inward of the rotary blade body and spaced apart in the circumferential direction on the radially inner side adjacent to the cutting edge on both surfaces of the rotary blade body. I have. Thereby, a hose is cut | disconnected by the blade edge | tip of a rotary blade main body by rotating a rotary blade main body.

  Generally, when a hose is cut at the blade edge of the rotary blade body, pressing force is generated on both sides of the rotary blade body from both sides of the cut part of the hose due to the restoring force of the hose itself (the repulsive force of the hose) To do. In particular, in the case of a hose having a reinforcing layer and a hose having a large diameter (thickness), the restoring force of the hose itself is large, and the pressing force on both surfaces of the rotary blade body may be large.

  In the rotary blade of the present invention, a plurality of grooves are provided in the radially inner portion adjacent to the cutting edge on both surfaces of the rotary blade body and arranged radially inward of the rotary blade body and spaced in the circumferential direction. Therefore, the plurality of groove portions come into contact with the cut portion of the hose, and the restoring force of the hose is repelled, so that the original cutting force of the rotary blade body can be exerted. That is, when the rotary blade body rotates, the plurality of grooves come into contact with the cut portions of the hose, so that the braking action on the rotary blade body due to the restoring force of the hose is released. Moreover, it can be expected that the cutting of the hose can be assisted by the rotation of the rotary blade main body so that the plurality of groove portions come into contact with the cut portion of the hose. For this reason, the hose can be easily cut by the rotary blade.

  According to a second aspect of the present invention, in the rotary blade according to the first aspect, the groove is formed in a straight line and is disposed toward the center of the rotary blade body.

  According to the second aspect of the present invention, the plurality of grooves are formed in a straight line and are arranged toward the center of the rotary blade body. Thereby, when a some groove part contacts the site | part by which the hose was cut | disconnected by rotation of the rotary blade main body, the effect | action of the brake action with respect to the rotary blade main body by the restoring force of a hose can be cancelled | released effectively.

  According to a third aspect of the present invention, in the rotary blade according to the first or second aspect, the sum of the length along the radial direction of the groove and the length along the radial direction of the blade edge is a cutting target. It is set to be larger than the maximum outer diameter of the hose.

  According to the invention of claim 3, since the sum of the length along the radial direction of the groove and the length along the radial direction of the blade edge is set to be equal to or greater than the maximum outer diameter of the hose to be cut, Even when the hose with the maximum outer diameter is cut, the plurality of grooves contact the cut portion of the hose. For this reason, also when cut | disconnecting the hose of a different outer diameter using a rotary blade, a hose can be cut | disconnected easily.

  According to a fourth aspect of the present invention, in the rotary blade according to any one of the first to third aspects, the plurality of groove portions are arranged at different positions on both surfaces of the rotary blade body. .

  According to the fourth aspect of the present invention, since the plurality of groove portions are arranged at different positions on both surfaces of the rotary blade body, a plurality of groove portions are provided at the same position on both surfaces of the rotary blade body. As compared with the above, it is possible to suppress a decrease in strength of the rotary blade body.

  According to a fifth aspect of the present invention, there is provided a cutting device according to any one of the first to fourth aspects, a rotating device that rotates the rotating blade according to any one of claims 1 to 4, a holding portion that holds the hose, and the rotating blade. Moving means for relatively moving in a direction perpendicular to the axial direction of the hose.

  According to the invention described in claim 5, the rotating blade is rotated by the rotating device, whereby the hose held by the holding portion is cut at the cutting edge of the rotating blade body. Moreover, a hose is cut | disconnected in the direction orthogonal to an axial direction by moving a rotary blade relatively in the direction orthogonal to the axial direction of a hose with a moving means. In that case, a hose can be easily cut | disconnected because the some groove part of both surfaces of a rotary blade main body contacts the site | part by which the hose was cut | disconnected by rotation of a rotary blade main body.

  A hose cutting structure according to a sixth aspect of the invention includes the cutting device according to the fifth aspect, and the hose is cut by the rotary blade.

  According to invention of Claim 6, a hose is cut | disconnected by the rotary blade of a cutting device. When the hose is cut with the rotary blade, a pressing force is generated on both sides of the rotary blade body by the restoring force of the hose itself from both sides of the cut. In that case, a hose can be easily cut | disconnected because the some groove part of both surfaces of a rotary blade main body contacts the site | part by which the hose was cut | disconnected by rotation of a rotary blade main body.

  According to the rotary blade, the cutting device, and the hose cutting structure according to the present invention, the hose can be easily cut.

It is a front view which shows the cutting device (cover cover part omission) provided with the rotary blade which concerns on one Embodiment of this invention. It is a rear view which shows the cutting device shown in FIG. It is a longitudinal cross-sectional view which shows the cutting device shown in FIG. (A) is a front view which shows the rotary blade used for the cutting device shown in FIG. 1, (B) is sectional drawing of the rotary blade along the 4B-4B line | wire in FIG. 4 (A). FIG. 2 is an enlarged cross-sectional view showing an enlarged vicinity of a cutting edge of a rotary blade used in the cutting apparatus shown in FIG. 1 and a cross-sectional view showing a hose having a maximum outer diameter to be cut. It is sectional drawing which shows the blade edge vicinity of the rotary blade of a comparative example. It is the side view seen from the direction orthogonal to the axial direction of a hose which shows the state which cuts a hose using the rotary blade of a comparative example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a cutting device (cutting device) 30 including a rotary blade 10 according to an embodiment of the present invention in a front view in which a cover lid portion is omitted. 2 shows the cutting device 30 in a rear view, and FIG. 3 shows the cutting device 30 in a longitudinal sectional view. As shown in FIGS. 1 to 3, the cutting device 30 is disposed so as to cover the rotary blade 10 that cuts the hose 60 (also referred to as “cutting”), and the peripheral edge and one side surface of the rotary blade 10. And a cover 32. The rotary blade 10 includes a disk-shaped rotary blade main body 12 and a cutting edge 14 that is provided on the peripheral edge of the rotary blade main body 12 and cuts the hose 60. Details of the rotary blade 10 will be described later.

  The cover 32 is configured by a hollow, substantially circular member so as to cover the periphery of the rotary blade 10. More specifically, the cover 32 includes a vertical wall portion 32A along one surface of the rotary blade body 12, and the lower end portion 12A of the rotary blade body 12 is exposed at the lower portion of the vertical wall portion 32A. A concave portion 32B is formed (see FIG. 2). In the cover 32, an opening 32 </ b> D is formed in the vertical wall portion 32 </ b> C along the other surface of the rotary blade main body 12 so that the central portion and the lower side of the rotary blade main body 12 are exposed (see FIG. 3). When the cutting device 30 is used, the opening 32D of the cover 32 is covered with a cover (safety cover) (not shown), so that the periphery of the rotary blade body 12 is covered with the cover 32 and the cover, and the lower end of the rotary blade body 12 The parts other than the part 12A are almost hidden. In the present embodiment, the lid portion is omitted for easy understanding of the configuration of the rotary blade 10. In addition, the structure of the cover 32 is not limited to this embodiment, A change is possible.

  The cutting device 30 includes a rotating device 33 that rotates the rotary blade 10. The rotating device 33 includes a rotating shaft 34 attached to the central portion of the rotary blade body 12, and the rotating shaft 34 is rotatably supported at the central portion of the cover 32 via a bearing (not shown) (FIG. 1). And FIG. 3). The rotating device 33 includes a motor 36 connected to a rotating shaft 34, and the motor 36 rotates the rotary blade body 12 in a certain direction (for example, the direction of arrow A in FIG. 1).

  The cutting device 30 includes a support base 38 on the lower side of the rotary blade body 12, and a portion of the lower end portion 12 </ b> A of the rotary blade body 12 exposed from the concave portion 32 </ b> B of the cover 32 is a groove portion provided in the support base 38. 38A (see FIG. 3). A plurality of rod-shaped guide members 40 as holding portions for holding the hose 60 are arranged on the side portion of the support base 38 so as to protrude from the support base 38 in a substantially horizontal direction. The plurality of guide members 40 are disposed at a predetermined interval, and the hose 60 is disposed so as to contact the upper surfaces of the plurality of guide members 40 (see FIG. 3). Further, at the side of the support base 38, at least two guide members 42 are provided on the upper side of the hose 60 as a holding portion that protrudes in a substantially horizontal direction. The hose 60 is being fixed to the support stand 38 by 60 contacting (refer FIG. 3). The positions of the guide member 40 and the guide member 42 can be adjusted according to the outer diameter of the hose 60.

  In the present embodiment, the plurality of guide members 40 and 42 arrange the hose 60 in a substantially linear shape as viewed from the direction orthogonal to the axial direction (see FIG. 3). In addition, the structure of the holding | maintenance part holding the hose 60 is not limited to this embodiment, A change is possible. Further, the holding shape of the hose 60 viewed from the direction orthogonal to the axial direction of the hose 60 is not limited to a substantially linear shape and can be changed. For example, you may arrange | position so that the center part of the axial direction of the hose 60 may curve a little upwards.

  In the cutting device 30, the position of contact with the cutting edge 14 of the rotary blade body 12 exposed from the concave portion 32 </ b> B of the cover 32 is the cutting position of the hose 60 held by the plurality of guide members 40 and 42.

  As shown in FIGS. 2 and 3, the cutting device 30 relatively moves the rotary blade 10 (rotary blade main body 12) in a direction orthogonal to the axial direction of the hose 60 held by the plurality of guide members 40 and 42. A moving device 44 is provided as a moving means for moving. The moving device 44 includes a base 46 and an arm 50 that is supported so as to be rotatable within a predetermined range about a rotation shaft 48 provided on the base 46. An arc-shaped support portion 52 is fixed to the distal end portion of the arm 50, and the motor 36 is fixedly supported on the support portion 52. In this moving device 44, the arm 50 rotates about the rotation shaft 48 in the direction of arrow B, and the motor 36 and the rotary blade 10 move to the lower side of the cutting device 30, whereby the cutting edge 14 of the rotary blade body 12. Moves downward. That is, the blade edge 14 of the rotary blade body 12 moves in a direction orthogonal to the axial direction of the hose 60 held by the plurality of guide members 40, 42. The arm 50 is provided with a lever (not shown), and the arm 50 is rotated in the direction of the arrow B and in the direction opposite to the arrow B by operating the lever.

  In addition, the structure of the moving apparatus which moves the rotary blade 10 (rotary blade main body 12) relatively to the direction orthogonal to the axial direction of the hose 60 is not limited to this embodiment, A change is possible. For example, the moving device may be configured to include a cylinder, a cam, or the like that moves the motor 36 and the rotary blade 10 in a substantially vertical direction.

  Moreover, the cutting device 30 injects cutting fluid (cutting oil) toward the cutting position where the cutting edge 14 of the rotary blade main body 12 and the hose 60 come into contact with both sides of the lower end portion 12 </ b> A of the rotary blade main body 12. A pair of injection devices 54 are provided. The injection device 54 is fixedly supported on the base 46 by a support member (not shown), and a tube (not shown) for supplying a cutting fluid is connected to the injection device 54. The injection device 54 includes a nozzle 54A that injects cutting fluid at the tip of the cylindrical portion, and the cutting fluid is injected from the nozzle 54A, whereby the hose 60 cut by the cutting edge 14 of the rotary blade body 12 is cut. Surface lubrication and cooling of the cutting edge 14 of the rotary blade body 12 are possible.

  For example, although not shown, the hose 60 to be cut is provided with a reinforcing layer on the outer peripheral side of the inner surface layer tube, and the outer side of the reinforcing layer is covered with an outer skin. The inner surface layer tube is made of, for example, resin or rubber. As the reinforcing layer, for example, a metal wire (for example, a high-strength steel wire) is used, and the reinforcing layer is configured by braiding the wire on the outer peripheral side of the inner surface layer tube or winding it in a spiral shape. Yes. Further, the outer skin is made of, for example, resin or rubber. The reinforcing layer is not limited to a metal wire, and for example, a reinforcing layer knitted with yarn may be used. The cross-sectional configuration of the hose 60 can be changed.

  The diameter (inner diameter) of the hose 60 is preferably φ32 mm or less. The hose 60 of the present embodiment has a diameter (inner diameter) of 25 mm and an outer diameter of 37 mm, and two reinforcing layers made of metal wires are formed.

  Next, the rotary blade 10 of this embodiment will be described in detail. 4A is a front view showing the entire configuration of the rotary blade 10, and FIG. 4B is a cross-sectional view of the vicinity of the blade edge 14 of the rotary blade body 12 along the radial direction (FIG. 4). 4 (A) is a cross-sectional view taken along line 4B-4B). FIG. 5 shows an enlarged cross-sectional view of the vicinity of the blade edge 14 of the rotary blade body 12.

  As shown in FIGS. 4A, 4 </ b> B, and 5, the rotary blade 10 includes a cutting edge 14 formed at the peripheral edge of a disk-shaped rotary blade body 12. As shown in FIG. 4 (B), the blade edge 14 has inclined surfaces 14A formed on both surfaces of the rotary blade body 12 so that the cross section becomes pointed toward the outside in the radial direction (FIG. 4 (B). ) And FIG. The rotary blade 10 is disposed radially inward of the rotary blade main body 12 at a radially inner portion 12B adjacent to the blade edge 14 on both surfaces of the rotary blade main body 12 and spaced apart in the circumferential direction. A groove 16 is provided (see FIG. 1). Further, an opening 12 </ b> C through which the rotation shaft 34 (see FIG. 1) is inserted is provided at the center of the rotary blade body 12.

  In the cross-sectional view along the radial direction of the rotary blade body 12, the plurality of groove portions 16 are near the boundary between the blade edge 14 and a portion 12 </ b> B where the width of the rotary blade body 12 radially inside the blade edge 14 is substantially uniform. To a predetermined length toward the inside in the radial direction. In the present embodiment, the plurality of groove portions 16 are formed in a substantially linear shape and are disposed toward the center of the rotary blade body 12. In other words, the plurality of groove portions 16 are provided in a predetermined radial inner side adjacent to the blade edge 14 on both surfaces of the rotary blade body 12, and the extended lines of the plurality of groove portions 16 intersect at the center of the rotary blade body 12. It is like that. In the present embodiment, the outer edge in the radial direction of the groove portion 16 is connected to the inclined surface 14A of the blade edge 14 (see FIG. 5). In addition, this invention is not limited to this structure, The structure where the edge of the radial direction outer side of the groove part 16 and 14 A of inclined surfaces of the blade edge | tip 14 was separated slightly may be sufficient. Further, the plurality of groove portions 16 are arranged at substantially equal intervals in the circumferential direction of the rotary blade body 12.

  In the present embodiment, the cross-sectional shape of the groove portion 16 is a shape recessed in a substantially rectangular shape. For example, it is preferable to provide 8 to 100 groove portions 16 on both surfaces of the rotary blade main body 12, respectively. The groove width of the groove portion 16 (width in the direction orthogonal to the radial direction of the rotary blade body 12) may be changed depending on the number of the groove portions 16, but is preferably approximately 0.5 to 1.0 mm. The depth of the groove 16 is set to approximately 0.2 mm in consideration of the strength of the rotary blade body 12.

  In the present embodiment, 16 grooves 16 are provided on both surfaces of the rotary blade body 12, and the 16 grooves 16 are provided at substantially the same positions on both surfaces of the rotary blade body 12. In order to ensure the strength of the rotary blade body 12, the positions of the groove portions 16 on both surfaces of the rotary blade body 12 may be shifted.

  Further, as shown in FIG. 5, the sum L1 of the length C along the radial direction of the groove 16 and the length B along the radial direction of the blade edge 14 is the maximum outer diameter of the hose to be cut ( D) It is set above (an example of the hose 62 having the maximum outer diameter (D) is shown in FIG. 5). Accordingly, even when the hose 62 having the maximum outer diameter is cut, the plurality of groove portions 16 come into contact with the cut portions of the hose 62 by the rotation of the rotary blade body 12.

  In this embodiment, the rotary blade main body 12 is comprised with the stainless steel blade, and the radius of the rotary blade main body 12 is set to about 200 mm. Further, the length B along the radial direction of the blade edge 14 of the rotary blade body 12 is set to 15 mm, and the length C along the radial direction of the groove portion 16 of the rotary blade body 12 is set to 35 mm. Yes. In the present embodiment, the sum L1 of the length C along the radial direction of the groove 16 and the length B along the radial direction of the blade edge 14 is 50 mm, and this value is the hose 60 to be cut as described above. The outer diameter is larger than 37 mm.

  In the rotary blade 10 of this embodiment, the lengths C along the radial direction of the plurality of groove portions 16 are set to be substantially the same, but the lengths along the radial direction of the groove portions 16 are not necessarily the same. May be. For example, when the lengths along the radial direction of the plurality of groove portions 16 are different, the sum L1 of the length C along the radial direction of the shortest groove portion 16 and the length B along the radial direction of the blade edge 14 is obtained. The hose to be cut is preferably set to be equal to or larger than the maximum outer diameter (W).

  Next, the operation and effect of the cutting device 30 (hose cutting structure by the cutting device 30) provided with the rotary blade 10 of the present embodiment will be described.

  As shown in FIG. 1 and the like, in the cutting device 30, a disk-shaped rotary blade body 12 constituting the rotary blade 10 is rotatably provided, and a cutting edge 14 is provided on the peripheral edge of the rotary blade body 12. It has been. The blade edge 14 is provided with inclined surfaces 14A formed on both surfaces of the rotary blade body 12 so that the cross section becomes pointed toward the outside in the radial direction. Further, the rotary blade 10 is disposed radially inward of the rotary blade main body 12 at a radially inner portion 12B adjacent to the blade edge 14 on both surfaces of the rotary blade main body 12 and spaced apart in the circumferential direction. A groove 16 is provided.

  In the cutting device 30, the hose 60 is held (fixed) in a direction substantially orthogonal to the surface direction of the rotary blade body 12 by the plurality of guide members 40 and 42. In this state, the rotary blade body 12 is rotated and the moving device 44 relatively moves the rotary blade body 12 in the direction perpendicular to the axial direction of the hose 60, thereby causing the hose 60 to move toward the cutting edge 14 of the rotary blade body 12. Disconnect with.

  Generally, when a hose is cut at the blade edge of the rotary blade body, pressing force is generated on both sides of the rotary blade body from both sides of the cut part of the hose due to the restoring force of the hose itself (the repulsive force of the hose) To do. In particular, a hose having a reinforcing layer made of a metal wire has a large restoring force of the hose itself, and there is a possibility that a pressing force against both surfaces of the rotary blade body will be large.

  In the rotary blade 10 of the present embodiment, the rotary blade body 12 is disposed on the radially inner side portion 12B adjacent to the blade edge 14 on both surfaces of the rotary blade body 12 toward the radially inner side of the rotary blade body 12 and spaced in the circumferential direction. A plurality of groove portions 16 are provided. As a result, when the hose 60 is cut by the rotation of the rotary blade body 12, the plurality of groove portions 16 come into contact with the cut portions of the hose 60, and the restoring force of the hose 60 is repelled. The cutting force of the main body 12 can be exhibited. That is, in the rotary blade 10, the action of the braking action on the rotary blade body 12 due to the restoring force of the hose 60 is released by the rotation of the rotary blade body 12 causing the plurality of grooves 16 to contact the cut portion of the hose 60. can do. Moreover, it can be expected that the cutting of the hose 60 is assisted by the rotation of the rotary blade body 12 so that the plurality of groove portions 16 come into contact with the cut portions of the hose. For this reason, in the rotary blade 10, the hose 60 can be easily cut.

  Further, in the rotary blade 10 of the present embodiment, the plurality of groove portions 16 are formed in a straight line shape and are arranged toward the center of the rotary blade body 12. Accordingly, when the plurality of groove portions 16 come into contact with the cut portion of the hose 60 due to the rotation of the rotary blade body 12, the action of the braking action on the rotary blade body 12 by the restoring force of the hose 60 is effectively canceled. be able to.

  Furthermore, in the rotary blade 10 of the present embodiment, the sum L1 of the length C along the radial direction of the groove 16 and the length B along the radial direction of the blade edge 14 is the hose 62 (FIG. 5) to be cut. The maximum outer diameter (W) of the reference) is set. Accordingly, even when the hose 62 having the maximum outer diameter is cut, the plurality of groove portions 16 come into contact with the cut portion of the hose 62 by the rotation of the rotary blade body 12. For this reason, also when cut | disconnecting the hose 60 of a different outer diameter using the rotary blade 10, the hose 60 can be easily cut | disconnected.

  In the cutting device 30 provided with the rotary blade 10 and the hose cutting structure by the cutting device 30, the hose 60 is held (fixed) by the plurality of guide members 40 and 42, and the rotary blade 10 is hose by the moving device 44. By moving in the direction orthogonal to the axial direction of 60, the hose 60 is cut in the direction orthogonal to the axial direction by the cutting edge 14 of the rotary blade body 12. In that case, the hose 60 can be easily cut | disconnected because the some groove part 16 of both surfaces of the rotary blade main body 12 contacts the site | part by which the hose 60 was cut | disconnected. In particular, in the hose 60 having a reinforcing layer made of a metal wire, the hose 60 can be rotated by the restoring force of the hose 60 from both sides as compared with a hose without a reinforcing layer or a hose in which a reinforcing layer is knitted with yarn. The pressing force acting on both surfaces of the blade body 12 is increased. At that time, the plurality of groove portions 16 on both surfaces of the rotary blade main body 12 come into contact with the cut portions of the hose 60, so that the hose 60 can be easily formed even when the hose 60 has a reinforcing layer made of a metal wire. Can be cut into pieces.

  FIG. 6 is a sectional view showing the vicinity of the cutting edge 14 of the rotary blade 100 of the comparative example. As shown in FIG. 6, the rotary blade 100 of the comparative example includes a disk-shaped rotary blade main body 102 (in FIG. 6, only the vicinity of the peripheral edge of the rotary blade main body 102 is shown). A cutting edge 14 is provided at the peripheral edge. The blade edge 14 includes inclined surfaces 14 </ b> A formed on both surfaces of the rotary blade body 102 so that the cross section becomes pointed toward the radially outer side of the rotary blade body 102. In the rotary blade 100, the radially inner portion 102A adjacent to the blade edge 14 on both surfaces of the rotary blade body 102 is formed in a substantially planar shape. That is, in the rotary blade 100, a plurality of grooves are not provided in the radially inner portion 102A adjacent to the blade edge 14 on both surfaces of the rotary blade main body 102.

  FIG. 7 is a side view showing a state in which the hose 60 having the reinforcing layer is cut in a direction orthogonal to the axial direction using the rotary blade 100 of the comparative example. As shown in FIG. 7, when cutting the hose 60 in the direction orthogonal to the axial direction with the cutting edge 14 of the rotary blade body 102, the repulsion of the hose 60 from the portions 61 </ b> A on both sides of the cut portion 61 where the hose 60 is cut. Due to the force (the restoring force of the hose 60 itself), a large pressing force is generated in the radially inner portion 102A adjacent to the blade edge 14 (see arrow F in FIG. 7). Further, since the hose 60 has a cylindrical shape, the area of pressing increases at an accelerated rate as the hose 60 is cut from the outer peripheral surface of the hose 60 in a direction orthogonal to the axial direction. The large pressing force from both sides of the cut portion 61 of the hose 60 increases as the hose 60 progresses, and is released all at once after the hose 60 is cut.

  In particular, when the reinforcing layer is made of a metal wire, the repulsive force of the hose 60 (the restoring force of the hose 60 itself) becomes extremely large because the wire is knitted into several layers. For this reason, as the cutting of the hose 60 progresses, the frictional force between the hose 60 and the rotary blade 100 increases, the original rotation of the rotary blade 100 cannot be maintained, and the rotary blade 100 may vibrate greatly. Further, the rotary blade 100 cannot be cut into the hose 60 at once, and the rotary blade 100 is moved in a direction perpendicular to the axial direction of the hose 60 (repeatedly pulling and pushing the rotary blade 100). It is necessary to proceed with the cutting of the hose 60.

  Further, at the cutting position where the hose 60 is cut by the cutting edge 14 of the rotary blade main body 102, the cutting fluid is sprayed from both sides of the rotary blade main body 102 by an injection device (not shown). When the frictional force increases, sparks may scatter from the cut portion of the reinforcing layer (wire). Moreover, the rotary blade main body 102 becomes high temperature by the heat_generation | fever by the increase in rotational friction. For this reason, after cutting the hose 60 and before cutting the next hose, it is necessary to spray the cutting fluid near the cutting edge 14 of the rotary blade body 102 and cool the vicinity of the cutting edge 14 of the rotary blade body 102.

  On the other hand, in the rotary blade 10 according to the present embodiment, the rotary blade body 12 is disposed in the radially inner portion 12B adjacent to the blade edge 14 on both surfaces of the rotary blade body 12 toward the radially inner side of the rotary blade body 12 and in the circumferential direction. A plurality of groove portions 16 arranged at intervals are provided. Thereby, when cutting the hose 60 with the cutting edge 14 of the rotary blade body 12, the plurality of grooves 16 come into contact with the cut portion of the hose 60, and the restoring force of the hose 60 is repelled. The cutting force of the main body 12 can be exhibited. That is, when the plurality of grooves 16 come into contact with the cut portion of the hose 60, the braking action on the rotary blade body 12 by the restoring force of the hose 60 can be released. Moreover, it can be expected that the cutting of the hose 60 is assisted by the rotation of the rotary blade body 12 so that the plurality of grooves 16 come into contact with the cut portions of the hose 60. For this reason, in the rotary blade 10, the hose 60 can be easily cut.

  Moreover, in the rotary blade 10 of this embodiment, compared with the rotary blade 100 of the comparative example, the frictional force between the hose 60 and the rotary blade 10 is reduced, and heat generation of the rotary blade body 12 can be suppressed.

  Using the cutting device 30 provided with the rotary blade 10 of this embodiment, the hose 60 was cut using two types of hoses 60 that are difficult to cut. As the hose 60, two types of hose 60 having two reinforcing layers made of metal wires and having a diameter of φ19 mm and φ25 mm were used. As a result, in the rotary blade 10 of the present embodiment, the vibration of the rotary blade 10 is reduced compared to the rotary blade 100 of the comparative example, and the rotary blade 10 is divided several times by the frictional force with the hose 60. It was confirmed that the need to repeatedly pull and push was avoided, and the hose 60 could be cut smoothly.

  In the rotary blade 10 of the present embodiment, the plurality of groove portions 16 are arranged at substantially the same positions on both surfaces of the rotary blade body 12, but the present invention is not limited to this, and the plurality of groove portions. 16 may be disposed on both surfaces of the rotary blade main body 12 while being shifted in position. Thereby, compared with the structure by which the some groove part 16 is provided in the substantially same position of both surfaces of the rotary blade main body 12, the fall of the intensity | strength of the rotary blade main body 12 can be suppressed.

  Moreover, in the rotary blade 10 of this embodiment, while the some groove part 16 is formed in substantially linear form and is arrange | positioned toward the center of the rotary blade main body 12, this invention is limited to this. is not. For example, the plurality of grooves 16 may have a curved shape or a wavy shape. Further, for example, the plurality of groove portions 16 may be arranged obliquely so as to slightly intersect with a line toward the center of the rotary blade body 12.

  Moreover, in this embodiment, although the several groove part 16 was arrange | positioned at substantially equal intervals in the circumferential direction of the rotary blade main body 12, this invention is not limited to this. For example, the plurality of groove portions 16 may change the interval in the circumferential direction of the rotary blade body 12.

  Moreover, in this embodiment, although the cross-sectional shape of the groove part 16 was formed in the substantially rectangular shape, this invention is not limited to this. For example, the cross-sectional shape of the groove portion 16 may be substantially U-shaped or substantially V-shaped.

  In the present embodiment, the hose 60 to be cut has a reinforcing layer, but the present invention is not limited to this. For example, the present invention can also be applied to cutting a hose that does not have a reinforcing layer.

DESCRIPTION OF SYMBOLS 10 Rotating blade 12 Rotating blade main body 12B Radially inner part 14 Cutting edge 14A Inclined surface 16 Groove part 30 Cutting device 33 Rotating device 34 Rotating shaft (Rotating device)
36 Motor (rotating device)
40 Guide member (holding part)
42 Guide member (holding part)
44 Moving device (moving means)
60 hose

Claims (6)

A rotary blade for cutting the hose,
A disk-shaped rotary blade provided with a blade edge which is provided rotatably and has a blade edge formed with inclined surfaces on both sides so that the cross-section is pointed toward the outer side in the radial direction, and cuts the hose at the blade edge The body,
A groove provided on a radially inner side adjacent to the blade edge on both surfaces of the rotary blade body, and disposed inward in the radial direction of the rotary blade body, and a plurality of grooves provided at intervals in the circumferential direction;
A rotating blade.   The rotary blade according to claim 1, wherein the groove is formed in a straight line and is disposed toward the center of the rotary blade body.   The sum of the length along the radial direction of the groove and the length along the radial direction of the cutting edge is set to be equal to or greater than the maximum outer diameter of the hose to be cut. Rotating blade.   The rotary blade according to any one of claims 1 to 3, wherein the plurality of groove portions are arranged to be shifted on both surfaces of the rotary blade main body. A rotating device that rotates the rotary blade according to any one of claims 1 to 4,
A holding part for holding the hose;
Moving means for relatively moving the rotary blade in a direction perpendicular to the axial direction of the hose;
Cutting device having. A cutting device according to claim 5,
A hose cutting structure for cutting the hose with the rotary blade.

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