JP2014133266A - Cutting jig for flexible shaft body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting jig for a flexible shaft body decreasing cutting load during cutting to a flexible shaft body.SOLUTION: A cutting jig includes a pair of clipping members 110. The pair of the clipping member 110 is oppositely arranged in a vertical surface to an axis z of a flexible shaft body to be cut. The pair of the clipping members 110 is formed with clipping recessed portions 121 and 122 for sandwiching the flexible shaft body. The clipping recessed portions 121 and 122 are formed so as to deform a cross section for improving the stiffness of the flexible shaft body, in a cutting direction y.

Description

  The present invention relates to a cutting tool for a flexible shaft such as a cylindrical resin foam and a method for cutting the flexible shaft.

In general, as a method of cutting a cylindrical body, a method of cutting a blade by pressing or pushing a blade against a workpiece, a method of piercing a workpiece with a sharp blade, and a cutting edge of a rotary blade. And a method of cutting the workpiece in the circumferential direction with a planetary cutter.
In the case of an object having flexibility among the cylindrical bodies, a means for cutting in a state where the cylindrical body is held so as not to be deformed in cross section has been adopted (for example, see Patent Document 1).

  For example, the flexible tube cutting device described in Patent Document 1 is a flexible tube cutting device for cutting a flexible tube exposed by cutting off an end portion of a cover body at a predetermined position in the length direction. Cutter with a disk-shaped blade for cutting the bottom of the concave portion of the flexible tube, an insertion portion to be inserted into the end of the flexible tube, and an end surface of the flexible tube, and a diameter almost equal to that of the cover body The cutter is passed to the peripheral surface end portion of the cover body and the peripheral surface of the expanded diameter portion of the reduced diameter preventing jig on one end side of the main body portion. Two parallel rollers are provided, a gripping part is formed on the other end of the main body, and a gripping part is provided with a rotatable operating part. At the tip, with two rollers Between the object, which is constituted so as to cut the bottom of the recess of the flexible tube across the exposed flexible tube.

JP-A-9-253925

However, in the case of the flexible tube cutting device described in Patent Document 1, it is necessary to cut the cylindrical body while holding the cylindrical body so as not to be deformed in cross section, so that the cutting load required to put the cutting blade on the cylindrical surface increases.
Furthermore, when cutting a cylindrical body having extremely low rigidity, the cylindrical body is crushed by contact with the cutting blade, and therefore cannot be cut while being held so as not to be deformed in cross section. For this reason, there has been a problem that the cut surface is easily distorted, wavy and / or burred.

  The objective of this invention is providing the jig | tool for the cutting | disconnection of a flexible shaft body and the cutting method of a flexible shaft body which make small the cutting load at the time of the cutting | disconnection with respect to a flexible shaft body.

  The inventor has found that the object of the present invention can be achieved by changing the cross-section of the workpiece so that the rigidity is improved in the cutting direction at the time of cutting, and has completed the present invention.

(1)
The cutting jig according to one aspect is used when cutting a cylindrical flexible shaft. The cutting jig includes a pair of clamping members. The pair of clamping members are disposed to face each other in a vertical plane with respect to the axis of the flexible shaft to be cut. At least one of the pair of sandwiching members is formed with a sandwiching recess for sandwiching the flexible shaft. The sandwiching recess is formed so as to be deformed in cross section so that the rigidity of the flexible shaft body is improved with respect to the cutting direction.

  The flexible shaft body to be cut is sandwiched and fixed by the holding recesses, so that the flexible shaft body to be cut is deformed in cross-section so that the rigidity is improved in the cutting direction. For this reason, it is possible to easily insert the cutting blade into the flexible shaft. Therefore, even a flexible shaft body with low rigidity can be cut with high accuracy.

(2)
The cross-sectional deformation may increase the curvature of the outer peripheral surface at the cutting start point of the flexible shaft.

  By locally increasing the curvature of the outer peripheral surface of the flexible shaft, the contact area between the outer peripheral surface of the flexible shaft and the cutting edge of the cutting blade can be reduced at the start of cutting. For this reason, it is possible to easily start passing the cutting blade through the flexible shaft with a weak force.

(3)
The cutting direction may be a direction perpendicular to the opposing direction of the clamping member and parallel to the vertical plane.

  Thereby, it can cut | disconnect by producing easily the cross-sectional deformation which the rigidity of a flexible shaft body improves with respect to a cutting direction.

(4)
The cross-sectional deformation may increase the curvature of the outer peripheral surface at the cutting end point of the flexible shaft.

Thereby, the rigidity of the flexible shaft body can be further improved with respect to the cutting direction.
Further, in the tubular flexible shaft body, the contact area between the flexible shaft body and the cutting blade can be reduced even at the end of cutting. For this reason, it is possible to easily pass the cutting blade until the end of cutting with a weak force.

(5)
At least one of the pair of clamping members has a meat escape portion that allows a part of the flexible shaft to escape from the clamping recess.

  Accordingly, it is possible to absorb the size error that may occur between the flexible shafts of different lots and easily cut the flexible shaft. Further, the present invention can also be applied to a flexible shaft having a size that does not fit in the holding recess when held by the holding member.

(6)
The meat escape portion may be provided on the outer peripheral surface of a part of the flexible shaft that has escaped outside the sandwiching recess so as to have a cutting start point and / or a cutting end point.

  Accordingly, the structure of the sandwiching recess and the meat escape portion is simple, and the flexible shaft body can be cut with high accuracy.

(7)
The cutting jig may further include a pair of auxiliary members. The pair of auxiliary members sandwich the flexible shaft together with the pair of sandwiching members. A predetermined gap is provided between the pair of clamping members and the pair of auxiliary members.

  Thereby, it is possible to insert and move the cutting blade between the pair of clamping members and the pair of auxiliary members. In this case, since both ends of the position to be cut of the flexible shaft body can be fixed by the holding member and the auxiliary member, cutting with higher accuracy is possible.

  By reducing the cutting load when cutting the flexible shaft, even a flexible shaft having low rigidity can be cut with high accuracy.

It is a typical appearance perspective view showing a 1st embodiment of a jig for cutting of the present invention. It is a typical front view which shows the aspect (a) at the time of unused of a pair of clamping member, and the aspect (b) at the time of use which clamped the tubular heat insulating material. It is typical sectional drawing (a)-(d) explaining that the cutting | disconnection from a cutting direction becomes easy by the cross-sectional deformation | transformation of a tubular heat insulating material. 2 (a) and 2 (b) are the same when the pair of holding members are not used (a) and the case of using a tubular heat insulating material having a larger outer diameter than the case of FIG. 2 (b). It is a typical front view showing a mode (b). It is the typical external view which looked at the mode at the time of use of the jig for cutting of Drawing 1 from the cutting start side. It is a typical front view showing the aspect (a) at the time of unused of the other examples of the jig | tool 100 for cutting in 1st embodiment, and the aspect (b) at the time of use which pinched | interposed the tubular heat insulating material. It is a typical front view showing the aspect (a) at the time of unused of the other examples of the jig | tool 100 for cutting in 1st embodiment, and the aspect (b) at the time of use which pinched | interposed the tubular heat insulating material.

[First embodiment]
Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments thereof. FIG. 1 is a schematic external perspective view showing a first embodiment of a cutting jig of the present invention. As shown in FIG. 1, the cutting jig 100 includes a pair of plate-shaped clamping members 110.

As shown in FIG. 1, the pair of plate-like holding members 110 has a shape that can naturally maintain an upright posture. In the following, for convenience of explanation, as shown in FIG. 1, a three-dimensional orthogonal coordinate system including an x-axis, a y-axis, and a z-axis is defined.
Hereinafter, each drawing will be described with reference to this three-dimensional orthogonal coordinate system. In addition, the x-axis, y-axis, and z-axis arrows in FIG. 1 indicate the positive direction of each axis (that is, the x-direction, y-direction, and z-direction), and the directions are the same in the other drawings.

[Clamping member]
FIG. 2A is a schematic front view showing a state when the pair of sandwiching members 110 is not used, and FIG. 2B is a schematic front view showing a state when used.
The pair of clamping members 110 includes a clamping member 111 and a clamping member 112. The sandwiching member 111 and the sandwiching member 112 are brought close to each other during use, and the tubular heat insulating material 200 to be cut is sandwiched between the sandwiching member 111 and the sandwiching member 112 that are close to each other.

  As shown in FIGS. 2A and 2B, the clamping member 111 and the clamping member 112 are parallel to a vertical plane (xy plane) with respect to the axis O of the tubular heat insulating material 200 to be cut. It is formed. Furthermore, the clamping member 111 and the clamping member 112 are disposed so as to face each other along the x direction in the vertical plane (xy plane).

[Clamping recess]
In the sandwiching member 111 and the sandwiching member 112, sandwiching recesses 121 and 122 for sandwiching the tubular heat insulating material 200 are formed on opposing surfaces 131 and 132 parallel to the yz plane, respectively.
The sandwiching recesses 121 and 122 cause the tubular heat insulating material 200 to be deformed in cross section so that the rigidity is improved with respect to the cutting direction D (the reverse direction of the y direction) connecting the cutting start point Ps and the axis O.

  More specifically, as shown in FIG. 2A, the sandwiching recess 122 in a cross section obtained by cutting the sandwiching members 111 and 112 along a plane parallel to the xy plane is an outer peripheral surface of the tubular heat insulating material 200 when not sandwiched. It exists in the axial center O side rather than the virtual circle V to show, and is curved and formed so as to be concave in the x direction. The sandwiching recess 121 is formed symmetrically with the sandwiching recess 122 with respect to a line passing through the axis O and parallel to the cutting direction D (y direction).

  For example, when a point on the holding recess 122 farthest from the axis O in the x direction is a point q, the curvature at the point q is the reciprocal 1 of the radius of curvature Rq which is the distance between the point q and the center of curvature Oq at the point q. / Rq. On the other hand, when a point on the virtual circle V indicating the outer peripheral surface of the tubular heat insulating material 200 when not sandwiched is a point p, the curvature at the point p is the point p and the center of curvature at the point p (that is, the axis O). It is represented by the reciprocal 1 / R of the radius of curvature R which is the distance. In this case, the curved surface of the sandwiching recess 122 is formed such that the curvature 1 / Rq is smaller than the curvature 1 / R. For this reason, the distance between the axis O and the point q is smaller than the distance between the axis O and the point p.

Therefore, the maximum distance Wq between the sandwiching recesses 121 and 122 formed in line symmetry with each other is smaller than the diameter W of the virtual circle V.
By forming the sandwiching recesses 121 and 122 as described above, as shown in FIG. 2B, the sandwiched tubular heat insulating material 200 is an ellipse having a long axis parallel to the cutting direction D (y direction). The cross section is deformed into a shape.

[Improvement of rigidity]
FIGS. 3A to 3D are schematic cross-sectional views illustrating that the cutting in the cutting direction D is facilitated by the cross-sectional deformation of the tubular heat insulating material 200. FIG.

  For comparison, FIG. 3A shows a part of a cross section cut along a plane parallel to the xy plane of the tubular heat insulating material 200 when the tubular heat insulating material 200 is sandwiched in a state where the cross-sectional deformation does not occur.

The cross section of the tubular heat insulating material 200 in FIG. 3A is a perfect circle. For this reason, the change in the thickness in the direction (y direction) parallel to the cutting direction D in the vicinity of the cutting start point Ps is poor. That is, there is no great difference between the thickness t at the cutting start point Ps and the thickness ta in the direction (y direction) parallel to the cutting direction D in the vicinity of the cutting start point Ps. In this case, when the tubular heat insulating material 200 receives a force in the cutting direction D (the direction opposite to the y direction), the tubular heat insulating material 200 cannot resist the force, and thus the cross section of FIG. Deform as shown in b).
That is, when the tubular heat insulating material 200 is sandwiched in a state where the cross-sectional deformation does not occur, the tubular heat insulating material 200 has a small rigidity with respect to the cutting direction D (reverse direction of the y direction), and the cutting direction D (reverse direction of the y direction) Large amount of cross-sectional deformation with respect to force.
As a result, as shown in FIG. 3B, since the contact area between the cutting edge of the cutting blade 300 and the outer peripheral surface 201 of the tubular heat insulating material 200 becomes larger, the cutting resistance by the cutting blade 300 also increases, and the tubular heat insulating material. 200 becomes difficult to cut.

On the other hand, FIG. 3C shows a part of the cross section of the tubular heat insulating material 200 cut along a plane parallel to the xy plane when the same tubular heat insulating material 200 as that in FIG. Indicates.
Here, the curvature at the cutting start point Ps in FIG. 3C is represented by the reciprocal 1 / Rc of the curvature radius Rc which is the distance between the point Ps and the center of curvature Oc at the point Ps.
On the other hand, the curvature at the cutting start point Ps in the case of FIG. 3A is represented by the reciprocal 1 / R of the radius of curvature R, which is the distance between the point Ps and the center of curvature at the point Ps (that is, the axis O). .

  The cross section of the tubular heat insulating material 200 in FIG. 3C is an ellipse whose major axis is parallel to the cutting direction D, and the curvature 1 / Rc at the cutting start point Ps of the outer peripheral surface 201 is in the case of FIG. Larger than curvature 1 / R. As a result, the contact area between the cutting edge of the cutting blade 300 and the outer peripheral surface 201 of the tubular heat insulating material 200 can be reduced at and near the cutting start point Ps.

  In this case, the change in the thickness in the direction (y direction) parallel to the cutting direction D in the vicinity of the cutting start point Ps is larger than that in the case of FIG. That is, the wall thickness tc in the direction (y direction) parallel to the cutting direction D near the cutting start point Ps is significantly larger than the wall thickness t at the cutting start point Ps. For this reason, the surrounding wall thickness can be increased and the force facing the cutting start point Ps can be received at the wall thickness tc, and as a result, the rigidity of the tubular heat insulating material 200 is increased.

  Therefore, even if the tubular heat insulating material 200 receives the force in the cutting direction D (the direction opposite to the y direction) at the cutting start point Ps, the tubular heat insulating material 200 can withstand the force, and thus substantially maintains the cross section of FIG. . That is, when the tubular heat insulating material 200 is sandwiched so that the cross-sectional deformation occurs, the tubular heat insulating material 200 has a large rigidity with respect to the cutting direction D (the reverse direction of the y direction), and the force in the cutting direction D (the reverse direction of the y direction). The amount of cross-sectional deformation is small.

  As a result, a state where the contact area between the cutting edge of the cutting blade 300 and the outer peripheral surface 201 of the tubular heat insulating material 200 is small is maintained, and a state where the cutting resistance by the cutting blade 300 is also small is maintained. In the case of FIG. The tubular heat insulating material 200 can be cut even with a small force that cannot be achieved.

  The cutting blade 300 may be pushed by applying a force in the cutting direction D (reverse direction to the y direction) to the tubular heat insulating material 200, or the cutting direction D (reverse direction to the y direction) applied to the tubular heat insulating material 200. ) May be pushed and pulled by applying a force having a component force.

  Further, in the present embodiment, the same deformation as that at the cutting start point Ps occurs at the tubular heat insulating material 200 cutting end point Pe. That is, the thickness in the direction parallel to the cutting direction D (y direction) around the cutting end point Pe is remarkably increased, and the rigidity at the cutting end point Pe is increased. Therefore, even when the cutting is finished, the state where the contact area between the cutting edge of the cutting blade 300 and the tubular heat insulating material 200 is kept small, the state where the cutting resistance by the cutting blade 300 is kept small, and no cross-sectional deformation occurs. Even with a small force that cannot be cut, the tubular heat insulating material 200 can be easily cut to the end.

[Meat escape section]
As shown in FIG. 1 and FIGS. 2A and 2B, meat clamping portions 141, 142, 143, and 144 are further formed in the clamping member 111 and the clamping member 112. The meat escape portions 141, 142, 143, and 144 seem to have a cross section cut by a plane parallel to the xy plane on the opposite side of the axis O from the outer peripheral surface of the tubular heat insulating material 200 having an elliptical cross section at the time of clamping. Formed. For example, the meat escape portion 141 is provided between the sandwiching recess 121 and the facing surface 131 on the y direction side. Specifically, it is provided so as to smoothly connect between the holding recess 121 and the facing surface 131. Thereby, a part of the sandwiched tubular heat insulating material 200 can be released.
Similarly, the meat escape portion 143 is provided between the sandwiching recess 121 and the opposing surface 131 on the opposite side in the y direction. Specifically, it is provided so as to smoothly connect between the holding recess 121 and the facing surface 131.
The meat escape portions 142 and 144 are formed symmetrically with the meat escape portions 141 and 143 with respect to a line in the y direction passing through the axis O.
Therefore, the tubular heat insulating material 200 can be strongly fixed by the meat escape portions 141, 142, 143, and 144 while reducing the diameter.

  Further, the meat escape portions 141 and 142 are formed so as to have the cutting start point Ps on the outer peripheral surface of a part of the tubular heat insulating material 200 that escapes outside the sandwiching recesses 121 and 122, and the meat escape portions 143 and 144 are Since the cutting end point Pe is formed on the outer peripheral surface of a part of the tubular heat insulating material 200 that has escaped outside the sandwiching recesses 121 and 122, a curvature increasing portion for improving rigidity, and the escaped tubular The meat portion of the heat insulating material 200 is generated at the same position. For this reason, the tubular heat insulating material 200 can be cut with high accuracy while the structures of the sandwiching recesses 121 and 122 and the meat escape portions 141, 142, 143, and 144 are simple.

  FIG. 4 (a) shows a state in which the same pair of clamping members 110 as in FIGS. 2 (a) and 2 (b) is not used, and FIG. 4 (b) shows a larger outer diameter than in the case of FIG. 2 (b). It is a typical front view which shows the aspect at the time of use which clamped the tubular heat insulating material 200a.

As shown in FIG. 4A, the curved surfaces of the sandwiching recesses 121 and 122 in the cross section when the sandwiching members 111 and 112 are cut in a plane parallel to the xy plane are the outer peripheral surfaces of the tubular heat insulating material 200a when not sandwiched. Is present on the axis O side with respect to the virtual circle Va. Further, the curved surfaces of the sandwiching recesses 121 and 122 are provided so that the curvature at the point q farthest from the axis O in the x direction is smaller than the curvature at the point pa on the virtual circle Va.
For this reason, as shown in FIG. 4B, the cross section of the sandwiched tubular heat insulating material 200 a is deformed so that the rigidity is improved with respect to the cutting direction D. Further, a part of the tubular heat insulating material 200 a that does not fit in the sandwiching recesses 121 and 122 is guided to the meat escape portions 141, 142, 143, and 144. Since the meat escape portions 141, 142, 143, and 144 are smoothly connected to the surfaces of the sandwiching recesses 121 and 122 and the opposing surfaces 131 and 132, the sandwiching members 111 and 112 cause undesirable damage and damage to the tubular heat insulating material 200 a. It is possible to prevent the application of pressure marks.

[Auxiliary members]
FIG. 5 is a schematic external view of the cutting jig 100 shown in FIG. 1 when used in the y direction.
As shown in FIGS. 1 and 5, the cutting jig 100 includes a pair of plate-like auxiliary members 113 and 114.

The auxiliary member 113 is connected to the holding member 111 by a plate-like connecting member 161. The connecting member 161 extends in the z direction, and fixes the holding member 111 and the auxiliary member 113 respectively, thereby generating a predetermined interval S between the holding member 111 and the auxiliary member 113.
It does not matter whether the clamping member 112 and the auxiliary member 114 are connected to each other. For example, it may not be connected from the viewpoint of easy attachment of the cutting jig, and may be connected from the viewpoint of certainty of holding the flexible shaft.

  The auxiliary member 114 is disposed at a predetermined interval S from the holding member 112 by facing the auxiliary member 113 in a plane parallel to the opposing surface (xy plane) of the holding members 111 and 112. A cutting blade (not shown) can be inserted and moved at a predetermined distance S between the holding members 111 and 112 and the auxiliary members 113 and 114. Although the auxiliary members 113 and 114 are not essential for the cutting jig 100, the auxiliary members 113 and 114 can be cut more easily by being provided in the cutting jig 100.

  As shown in FIG. 1, sandwiching surfaces 123 and 124 and meat escape portions 145, 146 and 147 are formed on the opposing surfaces 133 and 134 of the auxiliary members 113 and 114.

As shown in FIG. 1, the meat escape portion 145, the clamping surface 123, and the meat escape portion 147 of the auxiliary member 113 are connected in this order from the opposing surface 133 in the opposite direction to the y direction. The meat escape portion 145, the sandwiching surface 123, and the meat escape portion 147 are formed in a shape in which the projection in the z direction is the same as the meat escape portion 141, the sandwiching recess 121, and the meat escape portion 143 in the sandwiching member 111.
Furthermore, a gripping surface 151 inclined in the x direction and a surface 153 parallel to the y direction are formed in this order in the direction opposite to the y direction of the clamping surface 123.

  The meat escape portion 146 and the clamping surface 124 of the auxiliary member 114 are connected in series in this order from the facing surface 134 in the direction opposite to the y direction. The meat escape portion 146 and the sandwiching surface 124 are projected in the z direction from the surface from the meat escape portion 142 of the sandwiching member 112 and the point q of the sandwiching recess 122 (see FIGS. 2A and 3A). Are formed in the same shape. Furthermore, a surface 154 parallel to the y direction is formed continuously from the clamping surface 124 in the direction opposite to the y direction.

  Furthermore, the distance between the opposing surface 133 and the opposing surface 134 and the distance between the surface 153 and the surface 154 when the auxiliary members 113 and 114 are opposed to each other are substantially the same. Thereby, when the auxiliary members 113 and 114 are abutted, the opposing surface 133 and the opposing surface 134, and the surface 153 and the surface 154 are abutted, respectively.

As described above, the meat escape portion 141 and the clamping recess 121 of the clamping member 111 and the meat relief portion 145 and the clamping surface 123 of the auxiliary member 113 have the same shape, and the meat escape portion 142 and the clamping recess 122 of the clamping member 112 The meat escape portion 146 and the clamping surface 124 of the auxiliary member 114 have the same shape.
Thereby, as shown in FIG. 5, the tubular heat insulating material 200 is stably fixed on both sides in the z direction around the cutting start point Ps. Therefore, undesired movement of the tubular heat insulating material 200 resulting from the cutting start operation can be suppressed, and cutting with high accuracy is possible.

  The materials of the holding members 111 and 112 and the auxiliary members 113 and 114 may be the same or different, and are selected from metals and resins. A person skilled in the art performs molding, for example, by performing processing such as grinding and / or molding according to the material.

[Flexible shaft]
Including the tubular heat insulating material mentioned in the first embodiment, the flexible shaft that the cutting jig of the present invention is symmetrical to cut is a low-rigidity member. The degree of rigidity is such that the contact area between the cutting blade and the outer peripheral surface of the shaft body is increased by the load of the cutting blade when cutting from the outer peripheral surface in the direction of the axial center without receiving stress that causes cross-sectional deformation. The shaft body is bent, and the cut surface is distorted and / or wavy.
A flexible shaft satisfying such low rigidity depends on its material and three-dimensional shape. A person skilled in the art can easily select a material and a three-dimensional shape of the flexible shaft from the viewpoint of satisfying the low rigidity.

The material of the tubular heat insulating material which is the flexible shaft mentioned in the first embodiment is a resin foam.
The resin that becomes the foam is not particularly limited, and is appropriately selected by those skilled in the art. For example, polyolefin, polystyrene, polyurethane, polyphenol, polyvinyl chloride, vinyl chloride copolymer, polyvinylidene chloride, polyamide, polycarbonate, polyethylene terephthalate, polyimide, acrylic resin, EVA, ABS, epoxy resin, unsaturated polyester, melamine resin, Examples include urea resins, diallyl phthalate resins, xylene resins and other thermoplastic and thermosetting resins. The resin foam may be an elastomer foam described later. The unit weight of the resin foam is, for example, 10 kg / m ² or more, 20 kg / m ² or more, or 33 kg / m ² or more.

The material of the flexible shaft may be a resin other than the above-described resin foam mentioned as the material of the tubular heat insulating agent, or a resin that is not an aspect of the foam. The resin not in the form of a foam is not particularly limited and is appropriately selected by those skilled in the art. For example, the above-mentioned resin is mentioned.
The resin that is not in the form of a foam may be an elastomer. The elastomer is not particularly limited and is appropriately selected by those skilled in the art. Examples include olefin-based, styrene-based, polyurethane-based, polyester-based, polyamide-based, fluorine-based, butadiene-based, vinyl chloride-based and other thermoplastic and thermosetting elastomers.

  The tubular heat insulating material that is the flexible shaft described in the first embodiment is tubular, but the flexible shaft may be solid or hollow. When the flexible shaft is a hollow tube having a circular cross section, the ratio of the wall thickness to the radius is not particularly limited because it may vary depending on the material. For example, in the case of a resin not in the form of a foam, it is 8% or more and 15%. In the case of the foam, it is 12% or more and 37% or less.

The outer peripheral surface of the flexible shaft may be smooth, grooves may be formed in the outer peripheral direction and / or the longitudinal direction, or embossed. Moreover, the outer surface of the flexible shaft may be coated with a film.
Furthermore, the thick wall of the flexible shaft may be composed of a plurality of layers of different materials.

[Other examples]
6 and 7 are schematic front views illustrating other examples of the cutting jig 100 according to the first embodiment. In another example, a different point from 1st embodiment is demonstrated and description is abbreviate | omitted about the same point.

The cutting jig 100b according to another example shown in FIG. 6A and FIG. 6B is a meat relief portion 141, 142 in the clamping members 111, 112 of the cutting jig 100 according to the first embodiment. , 143, 144 are not used, and 111b, 112b are used.
On the opposing surfaces 131b and 132b of the sandwiching members 111b and 112b, sandwiching recesses 121b and 122b having the same shape as the outer peripheral surface of the tubular heat insulating material 200 after cross-sectional deformation are formed, respectively.

  In the cutting jig 100c according to another example shown in FIG. 7A and FIG. 7B, the clamping recess 121 is not formed in one clamping member 111 of the cutting jig 100 according to the first embodiment. The clamping member 111c is used.

  In the other clamping member 112c, a clamping recess 122c is formed on the opposing surface 132c. The sandwiching recess 122c is formed on the axis O side with respect to the virtual circle V indicating the outer peripheral surface of the tubular heat insulating material 200 when not sandwiched, and is curved so as to be recessed in the x direction. In this example, as shown in FIG. 7A, when the point on the holding recess 122c farthest in the x direction from the axis O in the holding member 112c is a point s, the curvature 1 / Rs at the point s, There is no significant difference between the curvature 1 / R at the point p. However, the opposing surface 131c with which the tubular heat insulating material 200 is in contact with the sandwiching member 111c is located closer to the axis O than the virtual circle V, and the curvature of the surface of the opposing surface 131c is zero, compared to the curvature of the virtual circle V. Always small. For this reason, the maximum distance Ws between the opposing surface 131c and the clamping recess 122c is smaller than the diameter W of the virtual circle V. As a result, as shown in FIG. 7B, the cross section of the sandwiched tubular heat insulating material 200 is deformed into a shape with improved rigidity with respect to the cutting direction D (the direction opposite to the y direction).

[Effects produced by the embodiment]
According to the cutting jigs 100, 100b, and 100c according to the first embodiment and other examples, the following effects are exhibited.
Since the tubular heat insulating materials 200 and 200a are clamped by the clamping recesses 121, 122, 121b, 122b, and 122c, the rigidity is improved with respect to the force in the cutting direction D (the direction opposite to the y direction). It is possible to easily insert a cutting blade into For this reason, for example, the occurrence of distortion and / or undulation of the cut surface can be preferably suppressed.
Even if it is weak force by increasing the curvature of the outer peripheral surfaces 201 and 201a at the cutting start point Ps, it is possible to easily pass the cutting blade through the flexible shaft body by the cross-sectional deformation by the tubular heat insulating materials 200 and 200a. is there. For this reason, distortion of a cut surface and / or generation | occurrence | production of a wave can be suppressed more preferably.
Since the cutting direction D is parallel to the opposing surface (xy plane) of the clamping members 111, 112, 111b, 112b, 111c, and 112c and is perpendicular to the opposing direction (x direction), the cutting direction D (reverse direction of the y direction) It is possible to easily cause a cross-sectional deformation in which the rigidity of the tubular heat insulating materials 200 and 200a is improved with respect to this force.
Since the cross-sectional deformation of the tubular heat insulating materials 200 and 200a increases the curvature of the outer peripheral surfaces 201 and 201a at the cutting end point Pe, it is possible to easily pass the cutting blade until the end of cutting even with a weak force. is there. For this reason, generation | occurrence | production of the burr | flash in a cut surface can be suppressed preferably, for example.
Since the meat escape portions 141, 142, 143, 144, 145, 146, 147, 142 c, 144 c are formed in the sandwiching members 111, 112, 112 c, the size of the size that can occur between the tubular heat insulating materials 200 a of different lots It is possible to absorb the error and easily cut the tubular heat insulating material 200a. Further, the present invention can also be applied to a tubular heat insulating material 200a having a size that does not fit in the sandwiching recesses 121, 122, and 122c when sandwiched by the sandwiching members 111, 112, and 112c.
Since the cutting jig 100 further includes a pair of auxiliary members 113 and 114, the tubular heat insulating material 200 can be more stably fixed at both ends of the cutting start point Ps.
For this reason, for example, the occurrence of distortion and / or undulation of the cut surface can be further preferably suppressed.

[Correspondence Relationship Between Each Part in Embodiment and Other Examples and Each Component in Claim]
In the present invention, the tubular heat insulating materials 200 and 200a correspond to “flexible shafts”, the cutting jigs 100, 100b, and 100c correspond to “cutting jigs”, and the clamping members 111, 112, 111b, 112b, 111c, 112c corresponds to the “clamping member”, the clamping recesses 121, 122, 121b, 122b, 122c correspond to the “clamping recess”, and the meat escape portions 141, 142, 143, 144, 145, 146, 147 , 142c, and 144c correspond to “meat escape portions”, and the auxiliary members 113 and 114 correspond to “auxiliary members”.

  A preferred embodiment of the present invention is as described above, but the present invention is not limited thereto. It will be understood that various other embodiments may be made without departing from the spirit and scope of the invention. Furthermore, in this embodiment, although the effect | action and effect by the structure of this invention are described, these effect | actions and effects are examples and do not limit this invention.

100, 100b, 100c Cutting jig 111, 112, 111b, 112b, 111c, 112c Holding member 113, 114 Auxiliary member 121, 122, 121b, 122b, 122c Holding recess 141, 142, 143, 144, 145, 146 147, 142c, 144c Meat escape portion 200, 200a Tubular heat insulating material (flexible shaft)
D Cutting direction Ps Cutting start point Pe Cutting end point S Predetermined interval

Claims (7)

A cutting jig used for cutting a cylindrical flexible shaft,
A pair of clamping members disposed in a plane perpendicular to the axis of the flexible shaft to be cut;
A sandwiching recess for sandwiching the flexible shaft is formed in at least one of the pair of sandwiching members,
The clamping jig is a cutting jig whose cross section is deformed so that the rigidity of the flexible shaft body is improved in the cutting direction.   The cutting jig according to claim 1, wherein the cross-sectional deformation increases a curvature of an outer peripheral surface at a cutting start point of the flexible shaft body.   The cutting jig according to claim 1, wherein the cutting direction is a direction perpendicular to the opposing direction of the clamping member and parallel to the vertical surface.   The cutting jig according to claim 2 or 3, wherein the cross-sectional deformation increases a curvature of an outer peripheral surface at a cutting end point of the flexible shaft body.   5. The cutting jig according to claim 1, wherein at least one of the pair of sandwiching members has a meat escape portion that allows a part of the flexible shaft to escape to the outside of the sandwiching recess.   The meat relief portion is provided so as to have the cutting start point and / or the cutting end point on an outer peripheral surface of the part of the flexible shaft that has escaped out of the holding recess by the meat relief portion. Item 6. The cutting jig according to any one of Items 2 to 5. The pair of auxiliary members for holding the flexible shaft together with the pair of holding members, further comprising a predetermined interval between the pair of holding members and the pair of auxiliary members. The cutting jig according to any one of the above.

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