JP3128435U - Sharpener for blades - Google Patents

Abstract

Disclosed is a sharpener for a blade which can prevent variation in force for pressing a blade edge against a conical surface and can perform uniform polishing.
A slit is provided to steer the blade so that the blade 31 is pressed against both the conical surfaces 6 and 7 during the sharpening process, and contact the both conical surfaces 6 and 7, and at least one of the pair of conical surfaces 6 and 7 is provided. And formed on the polished surfaces 6A and 7A. The bearing 11 includes a coil spring 22 that supports the rotary shaft 8 so as to be movable up and down and biases the rotary shaft 8 upward. When the blade 31 is pressed against the conical surfaces 6 and 7 and the polishing element 5 is pressed downward, the coil spring 22 pushes back the rotating shaft 8, and the blade 31 is pressed against the conical surfaces 6 and 7 into the slit. When moved back and forth, the side surface of the blade 31 comes into contact with the polishing surfaces 6A and 7A while being pressed substantially uniformly and is sharpened, so that uniform polishing can be performed.
[Selection] Figure 1

Description

  The present invention relates to a sharpener for a blade that sharpens a blade such as a knife or knife with a grindstone.

  Conventionally, as this kind, there are a frame, a grindstone provided on the frame in a rotatable manner, having a truncated cone surface shape and forming an angle with each other, and a sharpening blade during grinding. A knife sharpener provided with a guide member that steers the blade so as to press against both polishing surfaces and makes contact with the polishing surface, and a gutter provided on the frame and surrounding a lower portion of the grindstone (for example, Patent Document 1) Has been proposed.

  In the sharpening tool as described above, by moving back and forth obliquely with the cutter with respect to the axial direction of the grindstone having a truncated conical polishing surface, both the polishing surfaces hit the cutter and both side surfaces, and crush the cutting edge as in the conventional case. Thus, the polishing can be effectively performed as compared with the sharpening. However, even with this type of sharpener, there is a problem that, when sharpening with a blade, frictional heat is generated and the blade is dulled, or polishing scraps of the blade enter the eyes of the grindstone and cause clogging. And although the knife sharpener is provided with a ridge, the above-described problems of generation of frictional heat and clogging cannot be sufficiently solved. In addition, when clogging or dirt is caused by polishing scraps, there has been a problem that, since the grindstone is conventionally fixedly provided on the frame, the cleaning is difficult.

A blade sharpener (for example, Patent Document 2) that considers such a problem has been proposed. In this blade sharpener, a frame integrally having a gripping portion and a polishing portion is rotatable to the polishing portion. A rotating shaft that is horizontally installed obliquely with respect to the length direction of the frame, and a polishing surface that is provided at the center of the rotating shaft and has a truncated conical surface shape and forms an angle with each other. A grindstone, a guide member that steers the blade so that the blade is pressed against the two polishing surfaces during sharpening, and contacts the two polishing surfaces, and a flange provided on the polishing portion and surrounding the lower portion of the grindstone A sharpener for a cutting tool provided, wherein the height of the flange is formed higher than the lower intersection of the polishing surface, a polishing element composed of a pair of roll bodies having a conical surface, and the sharpening blade during the sharpening process Steer the blade so that it presses against the surface. A sharpener for a single-edged blade having a guide member brought into contact with both conical surfaces, wherein the one conical surface is formed on a polished surface, and the other conical surface is formed on a smooth and hard non-polished surface. A single-edged blade sharpener (for example, Patent Document 3) has been proposed in which the collar portion is provided.
Japanese Patent Laid-Open No. 62-181860 Utility Model Registration No. 3007312 Utility Model Registration No. 3010973

  In the sharpener for blades of Patent Documents 2 and 3, the blade can be polished in a state where a part of the conical surface is always in contact with the liquid in the collar over the entire length in the width direction. It has an excellent function and effect that it can cool and clean polishing scraps adhering to the polishing surface.

  By the way, in the above-mentioned patent documents 1 to 3, by moving back and forth along the guide member in a state where the blade is pressed against the conical surface, the side surface of the blade is brought into contact with the polished surface and polished. Therefore, the sharpened state differs depending on whether the blade is pressed against the blade. If the blade is pushed too hard, wrinkles may occur on the blade edge, which may reduce the sharpness before sharpening. With fine ceramic blades and fine ceramic knives, even if the polished surface was a diamond grindstone, it could not be polished satisfactorily.

  Therefore, the present invention has been made in consideration of the above points, and can provide a sharpener for a blade that can prevent variation in the force of pressing the blade edge against the conical surface and can perform uniform polishing. In addition, the object of the present invention is to provide a sharpener for a blade that can easily clean the grindstone and can effectively prevent the heat generation and clogging of the grindstone during polishing. An object of the present invention is to provide a sharpener for a blade that can be easily cleaned, and that can be easily assembled after the cleaning.

  According to a first aspect of the present invention, there is provided a frame that integrally includes a gripping portion and a polishing portion, a rotating shaft that is laterally provided on the polishing portion and that is inclined with respect to the length direction of the frame, and the polishing portion. And a polishing element provided with a pair of conical surfaces provided at the center of the rotation shaft, each having a truncated conical surface shape and forming an angle with each other, and a sharpening treatment. A sharpening tool for a cutter, comprising: a guide member that steers the cutter so that the middle cutter presses against both the conical surfaces and contacts the both conical surfaces; and at least one of the pair of conical surfaces is formed on a polished surface. The bearing includes an urging means for supporting the rotating shaft so as to move up and down and urging the rotating shaft upward.

  According to a second aspect of the present invention, the end of the rotary shaft is detachably locked to the bearing, and the bearing projects a pair of bearing arm portions that open and close elastically on the polishing portion. In addition, a bearing groove portion is formed between the bearing arm portions so as to support the end portion of the rotary shaft so as to be movable up and down and rotatable, and inward from the opposing inner edges of the pair of bearing arm portions, respectively. Are formed so that the interval between the engaging portions is slightly narrower than the diameter of the end portion of the rotating shaft, and the urging means is disposed below the bearing groove portion. is there.

  According to a third aspect of the present invention, the polishing portion is provided with a collar portion surrounding the lower portion of the polishing element.

  According to claim 4 of the present invention, the biasing means is a coil spring.

  According to a fifth aspect of the present invention, the end of the rotating shaft abuts against the coil spring and compresses the coil spring in a state where the end of the rotating shaft is locked to the bearing.

  According to claim 6 of the present invention, the biasing means is a coil spring made of stainless steel, and the lower side of the coil spring is fixed to the bearing.

  According to the first aspect of the present invention, the rotating shaft is urged upward by the urging means. Therefore, when the blade is pressed against the conical surface and the polishing element is pushed downward, the urging means is rotated. When the blade is pushed back and forth and moved back and forth along the guide member with the conical surface pressed against the conical surface, the side surface of the blade is sharply contacted and sharpened in a state of being pressed almost uniformly against the polishing surface. Polishing can be performed.

  According to the configuration of claim 2 of the present invention, the removed polishing element can be rotatably attached to the bearing groove portion of the bearing by inserting the end portion of the rotating shaft between the bearing arm portions from above the polishing portion. Since the urging means for urging the rotating shaft is disposed below the bearing groove, assembly is easy. Also, when the polishing element is lifted upward, the bearing arms can be opened by the elastic force to remove the polishing element, and in the removed state, the polishing element can be cleaned.

  According to the configuration of claim 3 of the present invention, it is possible to polish the blade with a part of both conical surfaces being in contact with the liquid in the collar, and the liquid cools the polishing element and adheres to the polishing surface. Polishing waste can be cleaned.

  According to the fourth aspect of the present invention, the rotating shaft can be urged upward by the elastic restoring force of the coil spring.

  According to the configuration of claim 5 of the present invention, since the end of the rotating shaft abuts on the coil spring and the coil spring is compressed, even if the blade is pressed down against the polishing element with a small force, the coil spring A force is obtained that pushes the polishing element up.

  According to the configuration of claim 6 of the present invention, since it is made of stainless steel, it can be used stably for a long time without rusting even when it comes into contact with the liquid in the collar, and the lower side of the coil spring is used as a bearing. Because it is fixed, even if the polishing element is removed for cleaning etc., the coil spring will not pop out and be lost, and there is no risk of the coil spring being lost, so it is easy to assemble the polishing element. Become.

  Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the embodiments described below do not limit the contents of the present invention described in the claims of utility model registration. In addition, all the configurations described below are not necessarily essential requirements of the present invention. In each embodiment, by using a new sharpener for blades different from the conventional one, an unprecedented sharpener for blades is obtained, and the sharpener for blades is described respectively.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1 to 6 show a first embodiment of the present invention, in which a frame 1 made of a synthetic resin has a grip portion 2 that is long in the left-right direction and a polishing portion provided at an end in the longitudinal direction of the grip portion 2. 3, and a separate lid 4 serving as a guide member is detachably provided on the upper portion of the polishing portion 3. A polishing element 5 made of alumina ceramics or the like is disposed in the polishing portion 3, and this polishing element 5 has a shape in which the lower parts of two top-like grindstones are combined and formed at the center. The conical surfaces 6 and 7 having a truncated cone shape are formed in a substantially V shape with an angle to each other, and further, a rotating shaft 8 is integrally provided on both sides, and the rotating shaft 8 is provided on the polishing portion 3 of the frame 1. The rotary shaft 8 is provided so as to be rotatable, and the rotary shaft 8 is inclined with respect to the length direction of the frame 1. In this example, the two conical surfaces 6 and 7 are the polishing surfaces 6A and 7A.

  Further, small diameter portions 10 which are end portions are formed on both sides of the rotating shaft 8 through stepped portions 9, and bearings 11 and 11 on which the small diameter portions 10 on both sides are detachably locked are polished. A flange 12 is formed in the portion 3 and is positioned between the bearings 11 on both sides to surround the lower portion of the polishing element 5, and the flange 12 protrudes in a ring shape from the bottom plate 13 of the polishing portion 3. It is installed. Note that 12T is the upper end of the flange 12.

  The bearing 11 protrudes from the bottom plate 13 of the polishing portion 3 and has a pair of bearing arm portions 15 and 15 projectingly opened and closed on the upper portion thereof, and the diameter between the bearing arm portions 15 and 15 is increased. A longitudinal bearing groove portion 16 that supports the small portion 10 so as to be movable up and down and rotatable is formed, and the upper portion of the bearing groove portion 16 projects inwardly from the inner edges of the pair of bearing arm portions 15 and 15 facing each other. Stop portions 17 and 17 are formed, and insertion guide portions 18 and 18 are formed between the inner edges of the locking portions 17 and 17 in an inverted C shape, and the lower ends of the insertion guide portions 18 and 18 are formed on the bearing grooves. The space H between the lower ends of the insertion guide portions 18 and 18 is formed to be slightly narrower than the diameter dimension of the small diameter portion 10.

  In the bearing arm portion 15, a vertical groove portion 21 having a substantially rectangular plane is vertically provided below the bearing groove portion 16, and a coil spring 22 as an urging means is inserted and disposed in the vertical groove portion 21. The lower part of the coil spring 22 is fixed by being press-fitted into the longitudinal groove part 21, and the upper part protrudes into the bearing groove part 16, and the small diameter part 10, between the insertion guide parts 18, 18 from above the polishing part 3. 10 is inserted, and the upper end of the coil spring 22 is a small diameter portion with the pair of bearing arm portions 15 and 15 being opened step by step and inserted into the bearing groove portions 16 and 16 below the locking portions 17 and 17. 10, the coil spring 22 is compressed.

  The lid 4 as a guide member is provided with slits 32 for guiding the blade 31 corresponding to the polishing element 5, and these slits 32 are formed orthogonal to the length direction of the frame 1, thereby When the blade 31 is inserted into the blade 32 and moved back and forth, the blade 31 is steered by the slit 32, and the blade 31 is pressed against both the polished surfaces 6A and 7A. In this example, the blade 31 is a double blade.

  Further, a disk-like permanent magnet 33 is fixed to the center of the lower surface of the frame 1, and rubber sheets 34 and 34 as anti-slip members are fixed to the lower surface on one side and the other side of the frame 1. Yes.

  Next, a method of using the blade sharpener will be described. The lid 12 is filled with a liquid 35 such as water or oil, and the lid 4 is covered. Holding the grip 2 and holding the frame 1, if it is on a metal table, the permanent magnet 33 on the lower surface is attracted to fix the frame 1, and the rubber sheets 34, 34 prevent displacement. . In this state, when the blade 31 is inserted into the slit 32 and moved back and forth, the side surface of the blade 31 comes into contact with the polishing surfaces 6A and 7A and is sharpened. At this time, when the cutting tool 31 is pressed against the polishing surfaces 6A and 7A and the polishing element 5 is pressed down, the coil spring 22 pushes back the rotating shaft 8, and the side surface of the cutting tool 31 is substantially pressed against the polishing surfaces 6A and 7A. Since the contact is sharpened while being pressed uniformly, uniform polishing can be performed.

  Further, as the blade 31 moves back and forth, the polishing element 5 rotates while contacting the liquid 35 in the flange 12. Then, the liquid 35 absorbs heat generated during polishing, the blade 31 is prevented from being blunted by heat generation, and the polishing surface is cleaned so that the polishing surfaces 6A and 7A are not clogged. Retained.

  When the cutting tool 31 is pressed against the polishing element 5 in this way, the force with which the polishing element 5 hits the cutting tool 31 can be made substantially uniform by the force of the coil spring 22 pushing back, and a cutting knife having a corrugated cutting edge can also be polished. It is possible to polish fine ceramic blades and the like.

  On the other hand, the polishing element 5 is removed from the bearings 11 and 11, and the polishing element 5 and the flange 12 are cleaned. Thereafter, the polishing element 5 can be rotatably attached to the bearings 11 and 11 by inserting the small diameter portions 10 and 10 between the insertion guide portions 18 and 18 from above the polishing portion 3. When the polishing element 5 is lifted upward, the elastic force between the bearing arm portions 15 and 15 opens, and the polishing element 5 can be removed. Even if the polishing element 5 is removed, the coil spring 22 remains in the longitudinal direction of the bearing 11. Since it is fixed to the groove portion 21, it does not pop out and comes off and can be easily attached at the time of attachment.

  Thus, in this embodiment, corresponding to claim 1, the frame 1 integrally having the gripping portion 2 and the polishing portion 3, and the slanting portion with respect to the length direction of the frame 1 that is laterally provided on the polishing portion 3. The rotary shaft 8 provided, the bearing 11 provided in the polishing section 3 and provided so that the rotary shaft 8 can rotate, and the center of the rotary shaft 8 each having a truncated cone surface shape and forming an angle with each other. The polishing element 5 having a pair of conical surfaces 6 and 7 and a guide member that steers the blade 31 so that the blade 31 is pressed against both the conical surfaces 6 and 7 during the sharpening process and contacts the both conical surfaces 6 and 7. In a blade sharpener provided with a slit 32 and having at least one of a pair of conical surfaces 6 and 7 formed on a polished surface 6A, 7A, a bearing 11 supports the rotary shaft 8 so as to be movable up and down, and the rotary shaft 8 is moved upward. Since the coil spring 22 is provided as an urging means for urging the rotating shaft 8, the rotating shaft 8 is a coil. Since the blade 31 is biased upward by the pulling 22, when the blade 31 is pressed against the conical surfaces 6 and 7 and the polishing element 5 is pushed downward, the coil spring 22 pushes back the rotating shaft 8, and the blade 31 is conical. When moving back and forth along the slit 32 while being pressed against the surfaces 6 and 7, the side surface of the blade 31 comes into contact with the polishing surfaces 6A and 7A in a state of being pressed substantially uniformly and is sharpened. It can be performed.

  Thus, in this embodiment, corresponding to claim 2, the bearing 11 is detachably locked with the small-diameter portion 10 as the end of the rotating shaft 8, and the bearing 11 is elastically A pair of bearing arm portions 15, 15 that open and close are projected from the polishing portion 3, and a bearing groove portion 16 that rotatably supports the small-diameter portion 10 of the rotating shaft 8 between the bearing arm portions 15, 15. Are formed on the upper portion of the bearing groove 16 so as to protrude inward from the opposing inner edges of the pair of bearing arm portions 15 and 15, respectively, and an interval H between the engagement portions 17 and 17 is formed. Is formed to be slightly narrower than the diameter dimension of the small diameter portion 10 of the rotary shaft 8 and the coil spring 22 as the biasing means is disposed below the bearing groove portion 16, so that the removed polishing element 5 is the same as that of the polishing portion 3. A small diameter portion 10 of the rotary shaft 8 can be inserted between the bearing arm portions 15 and 15 from above and can be rotatably mounted on the bearing groove portion 16 of the bearing 11. A coil spring 22 for urging the rotary shaft 8 is easy to assemble from disposed. Further, when the polishing element 5 is lifted upward, the bearing arm portions 15 and 15 are opened by the elastic force so that the polishing element 5 can be removed, and the polishing element 5 can be cleaned in the detached state.

  In this way, in this embodiment, since the flange portion 12 surrounding the lower portion of the polishing element 5 is provided in the polishing portion 3 in correspondence with the third aspect, a part of both conical surfaces 6 and 7 is in the flange portion 12. The blade 31 can be polished in contact with the liquid 35, and the polishing element 5 can be cooled and the polishing debris adhering to the polishing surfaces 6A and 7A can be cleaned by the liquid 35.

  In this way, in this embodiment, the urging means is the coil spring 22 corresponding to the fourth aspect, so that the rotating shaft 8 can be urged upward by the elastic restoring force of the coil spring 22.

  In this way, in this embodiment, corresponding to claim 5, the small-diameter portion 10 that is the end of the rotating shaft 8 is in the state where the small-diameter portion that is the end of the rotating shaft 8 is locked to the bearing 11. Since the coil spring 22 is pressed against the coil spring 22 and compressed, even if the blade 31 is applied to the polishing element 5 with a small force and pushed down, a force for pushing the polishing element 5 upward by the coil spring 22 can be obtained.

  In this way, in this embodiment, the biasing means is a stainless steel coil spring 22 and the lower side of the coil spring 22 is fixed to the bearing 11 in correspondence with the sixth aspect. Therefore, even if it comes into contact with the liquid 35 in the collar part 12, it can be used stably for a long time without rusting, and since the lower side of the coil spring 22 is fixed to the bearing 11, For this reason, even if the polishing element 5 is removed, the coil spring 22 does not jump out and is lost, and there is no risk of the coil spring 22 being lost, so that the polishing element 5 can be easily assembled.

  7 and 8 show a second embodiment of the present invention. The same reference numerals are given to the same portions as those in the first embodiment, and the detailed description thereof will be omitted. In this example, the polishing element 5 is The member on the conical surface 6 side is made of alumina or silicon carbide ceramics, the conical surface 6 is formed on the polished surface 6A, and the member on the other conical surface 7 made of a different material is silica. The conical surface 7 is formed as a smooth and hard non-polished surface 7B.

  Next, a method for using the blade sharpener will be described. The lid 12 is filled with a liquid 35 such as water or oil, and the lid 4 is covered. Holding the grip 2 and holding the frame 1, if it is on a metal table, the permanent magnet 33 on the lower surface is attracted to fix the frame 1, and the rubber sheets 34, 34 prevent displacement. . In this state, when the inclined surface 41 of the blade 31 is inserted into the slit 32 in accordance with the polishing surface 6A and moved back and forth, both sides of the blade edge 42 of the blade 31 come into contact with each conical surface 6 and 7 being pressed, The inclined surface 41 is polished by one polishing surface 6A, and the blade turning 43 generated on the other of the cutting edges 42 by this polishing is slid to the non-polishing surface 7B and removed.

  As described above, in this embodiment, in the blade sharpener in which at least one of the pair of conical surfaces 6 and 7 is formed on the polished surface 6A, the bearing 11 supports the rotary shaft 8 so as to be movable up and down, and the rotary shaft 8 is moved upward. Since the coil spring 22 as the biasing means for biasing is provided, the same operations and effects as the first embodiment are obtained.

  9 to 11 show a third embodiment of the present invention. The same reference numerals are given to the same parts as those in the first embodiment, and the detailed description thereof will be omitted. The frame 1 is formed by integrating a grip portion 2A that is long in the left-right direction and a polishing portion 3A provided at an end portion in the longitudinal direction of the grip portion 2, and a guide member is provided above the polishing portion 3A. A separate lid 4A is provided.

  The polishing section 3A has a substantially semi-cylindrical lower case 52 having an upper opening 51. Corresponding to the lower case, the lid body 4A is also substantially semi-cylindrical, and one side of the lid body 4A is The pivoting portion 53 is pivotally attached to the upper edge 51A on one side of the upper opening 51, whereby the lid 4A is provided on the polishing portion 3A so as to be openable and closable.

  A pair of bearing arm portions 15 and 15 that elastically open and close is provided on the bottom plate 13A of the lower case 52 of the polishing portion 3A, and bearings 11 and 11 are provided in the same manner as in the first embodiment. A polishing element 5 is provided at 11.

  In this example, a part of the lower case 52 constitutes a collar part 12A surrounding the lower part of the polishing element 5, and in the state of use, the collar part 12A of the lower case 52 has the above-mentioned upper end of the collar part 12. The liquid 35 can be filled up to the upper edge 51A.

  As described above, in this embodiment, in the blade sharpener in which at least one of the pair of conical surfaces 6 and 7 is formed on the polished surface 6A, the bearing 11 supports the rotary shaft 8 so as to be movable up and down, and the rotary shaft 8 is moved upward. Since the coil spring 22 is provided as an urging means for urging the lens, the same operations and effects as the above-described embodiments are achieved.

  Further, as an effect on the embodiment, the height of the flange portion 12A is formed higher than the lower intersection K of the conical surfaces 6 and 7, and a part of both conical surfaces 6 and 7 extends over the entire length in the width direction. The blade 31 can be polished while being in contact with the liquid 35 in the collar 12 at all times. The liquid 35 cools the polishing element 5 and cleans the polishing debris adhering to the polishing surface 6A, 7A or the non-polishing surface 7B. It can be performed.

  The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the gist of the present invention. For example, in order to fix the lower part of the coil spring 22 to the bearing, various means such as fitting and adhesion can be used. With the polishing element removed from the bearing, the coil spring 22 is detached by turning the bearing upside down. It only has to be fixed to a certain extent. Further, the number of polishing elements provided in the polishing portion may be two or more. Furthermore, in claim 1, the urging means may be a leaf spring or the like.

It is sectional drawing which shows the attachment state of the grinding | polishing element which shows Example 1 of this invention, FIG. 1 (A) is a state before pressing a cutter, FIG.1 (B) is pressing a cutter which is not illustrated, and polishing element. Indicates a lowered state. FIG. 2 is a longitudinal sectional view of the polishing element. FIG. 2 is a longitudinal sectional view of the polishing element. FIG. 2 is a plan view around the polishing element. It is a top view same as the above. It is a side view same as the above. FIGS. 6A and 6B are cross-sectional views showing a mounting state of a polishing element according to a second embodiment of the present invention, FIG. 6A is a state before pressing a blade, and FIG. 6B is a polishing element pressed against a blade (not shown). Indicates a lowered state. It is sectional drawing of the blade edge | tip of a cutter same as the above. It is a top view which shows Example 3 of this invention. It is a side view same as the above. FIG. 9 is a cross-sectional view taken along line AA of FIG.

Explanation of symbols

1 Frame 2, 2A Grasping part 3, 3A Polishing part 5 Polishing element 6 Conical surface 6A Polishing surface 7 Conical surface 7A Polishing surface 7B Non-polishing surface 8 Rotating shaft
10 Small diameter part (end)
11 Bearing
12, 12A Isobe
15 Bearing arm
16 Bearing groove
17 Locking part
22 Coil spring (biasing means)
31 Cutlery
32 Slit (guide member)
35 Liquid 7B Non-polished surface

Claims (6)

A frame integrally having a gripping part and a polishing part, a rotating shaft provided laterally on the polishing part and inclined with respect to the length direction of the frame, and provided on the polishing part so that the rotating shaft can rotate. A bearing provided, a polishing element provided at the center of the rotating shaft and having a pair of conical surfaces each having a truncated cone surface shape and forming an angle with each other; A sharpening tool for cutting the blade so as to press and contact the both conical surfaces, and a sharpener for a blade in which at least one of the pair of conical surfaces is formed on a polished surface. A sharpening tool for a blade, which is provided with urging means for supporting the rotative shaft upward so as to be movable up and down. The end of the rotating shaft is detachably locked to the bearing, and the bearing has a pair of bearing arms that open and close in a protruding manner on the polishing portion, and between the bearing arms. A bearing groove that supports the end of the rotating shaft so as to be movable up and down and rotatably is formed, and a locking portion that protrudes inward from the inner edges of the pair of bearing arms is formed at the top of the bearing groove. The space between the engaging portions is formed to be slightly narrower than the diameter dimension of the end portion of the rotating shaft, and the urging means is disposed below the bearing groove portion. Sharpener for blades. The sharpener for a blade according to claim 1 or 2, wherein a flange portion surrounding the lower portion of the polishing element is provided in the polishing portion. The sharpening tool for a blade according to any one of claims 1 to 3, wherein the biasing means is a coil spring. 5. The sharpener for a blade according to claim 4, wherein the end of the rotating shaft abuts on the coil spring and compresses the coil spring in a state where the end of the rotating shaft is engaged with the bearing. 6. A sharpener for a blade according to claim 2, 3 or 5, wherein the biasing means is a coil spring made of stainless steel, and a lower side of the coil spring is fixed to the bearing.

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