Knife sharpener

Abstract

The utility model discloses a knife sharpener which is good in applicability and knife sharpening effect and comprises a base, a knife sharpening portion and a knife rest are arranged on the base, and the knife sharpening portion is used for sharpening a blade when the knife sharpening portion is in contact with the blade portion of a knife; the knife rest is rotatably arranged and is used for placing a knife, and the edge part of the knife and the knife sharpening part are arranged at an included angle a structure; the matching part is arranged on the knife rest; the positioning part is fixedly arranged in the circumferential direction; the knife rest is rotated to adjust the included angle a between one end face of the blade part and the grinding face of the knife grinding part, and the matching part rotates along with the knife rest and has a position matched with the positioning part to lock the knife rest; the utility model relates to the technical field of knife sharpeners.

Description

Technical Field

[0001] The utility model relates to the technical field of knife sharpeners, more specifically to a knife sharpener. Background Art

[0002] Existing knife sharpeners are generally divided into two types: electric knife sharpeners and non-electric knife sharpeners, both of which are used to sharpen knives such as kitchen knives or sharpen the knives.

[0003] Please refer to the electric belt sharpener disclosed in announcement number CN201483304U, which adopts the structure that a power source drives a single belt to rotate, and when used for sharpening, the blade of the tool is directly in contact with the grinding surface of the belt;

[0004] Due to the lack of a reasonable tool fixture, when sharpening a knife, the user needs to hold the knife and make the blade of the knife contact the grinding surface of the abrasive belt at a suitable angle a according to the experience of sharpening. In addition, during the sharpening process, the shaking of the knife will change the angle a between the blade and the grinding surface, and the contact area between the grinding surface and the knife will change, which will cause poor grinding consistency of the blade.

[0005] In addition, this method of sharpening knives tests the user's proficiency and is not suitable for novices. Even experienced users will encounter differences in grinding effects when grinding different knives, and the sharpener cannot meet the user's actual usage needs. Utility Model Content

[0006] In view of the shortcomings and defects of the prior art, a knife sharpener with good applicability and good knife sharpening effect is provided.

[0007] A knife sharpener, comprising:

[0008] A base, wherein a sharpening portion and a knife holder are arranged on the base, wherein the sharpening portion is used to sharpen the blade when contacting the blade of the knife;

[0009] The tool holder is rotatable and is used to place the tool, and the blade of the tool and the sharpening part are arranged at an angle a.

[0010] A matching portion, wherein the matching portion is arranged on the tool holder;

[0011] A positioning portion, the positioning portion is fixedly arranged in a circumferential direction;

[0012] The tool holder is rotated to adjust the angle a between one end surface of the blade portion and the grinding surface of the grinding portion, and the matching portion rotates with the tool holder to have a position matched with the positioning portion to lock the tool holder.

[0013] After adopting the above structure, the knife sharpener of the utility model has the following advantages compared with the prior art: when in use, according to the sharpening angle requirement of the tool, the tool holder is rotated until the angle a between the blade of the tool and the sharpening part reaches a suitable angle. At the suitable angle, the contact performance between the blade of the tool and the grinding surface of the sharpening part is good, so that the sharpening effect is improved. In addition, the adjustable setting of the angle a can be applied to different types of tool sharpening operation requirements, and the device has good applicability;

[0014] When the matching portion rotates with the tool holder to match the positioning portion and locks the tool holder, the tool holder is positioned stably, and the angle a between the blade of the tool and the sharpening portion is stable, so that the blade of the tool is ground consistently and evenly, and the sharpening effect is good.

[0015] As an improvement of the utility model, the tool holder is provided with engaging grooves at intervals along the circumferential direction, and a movable pin is provided on the base, and the movable pin enters the engaging groove to limit the rotation of the tool holder.

[0016] As an improvement of the utility model, a connecting portion is provided at the rear end of the tool holder, and the front end of the connecting portion is sleeved on the shaft body of the base through an inner hole;

[0017] A fixing frame is arranged on the shaft body, the movable pin is connected to the fixing frame, and an elastic member is arranged between the movable pin and the fixing frame, and the elastic member drives the movable pin head to move elastically forward and backward to enter the fitting groove or move out of the fitting groove.

[0018] As an improvement of the utility model, the tail end of the movable pin is hingedly connected to the fixed frame, and the movable pin can be deflected along the axial direction of the tool holder;

[0019] A receiving groove is provided at the tail end of the connecting part, and the arranged mating grooves are provided on the peripheral wall of the receiving groove. A first guide part is provided at the position of the tail end of the arranged mating grooves in the receiving groove, and the first guide part has an inclined first guide surface. When the tool holder rotates forward until the first guide surface is in continuous contact with the inner side surface of the movable pin, the first guide surface drives the movable pin to deflect axially outward, so that when the tool holder rotates reversely, the head of the movable pin and the arranged mating grooves are always in a disengaged position in the moving trajectory of the mating groove.

[0020] As an improvement of the utility model, the outer end opening of the accommodating groove is detachably connected with an end cover, and the end cover and the connecting part are arranged to rotate synchronously. A second guide part is provided on the end cover, and the second guide part extends into the accommodating groove and is located at the front end of the arranged matching groove. The second guide part is provided with an inclined second guide surface, and the tool holder rotates reversely until the second guide surface is in continuous contact with the outer side surface of the movable pin, and the second guide surface drives the movable pin to deflect axially inward to reset, so that when the tool holder rotates forward, the head of the movable pin and the arranged matching groove are in a position for matching in the moving trajectory of the matching groove.

[0021] As an improvement of the utility model, a first adsorption pad is provided on the end cover, the first adsorption pad is positioned relative to the first guide portion, and the first adsorption pad is used to adsorb and position the movable pin guided and deflected by the first guide portion;

[0022] A second adsorption pad is arranged in the accommodating groove. The second adsorption pad is positioned relative to the second guide portion. The second adsorption pad is used to adsorb and position the movable pin guided and deflected by the second guide portion.

[0023] As an improvement of the utility model, the grinding part adopts an abrasive belt, and an active roller and a driven roller are rotatably connected to the base. The active roller is driven to rotate by a power source, and the active roller and the driven roller are arranged laterally. The abrasive belt is sleeved between the active roller and the driven roller, and the grinding surface of the abrasive belt between the active roller and the driven roller is formed into a straight structure.

[0024] As an improvement of the utility model, the tool holder is provided with a placement end surface, one side of the tool is supported by the placement end surface, and the lower end of the placement end surface is arranged to point to the grinding surface of the straight area of ​​the abrasive belt to form a "V"-shaped structural angle arrangement. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the utility model.

[0026] Figure 2 It is a cross-sectional structural schematic diagram of the utility model.

[0027] Figure 3 This is a schematic diagram of the connection structure of the tool holder part of the utility model in the exploded state of the parts. Figure 1 .

[0028] Figure 4 This is a schematic diagram of the connection structure of the tool holder part of the utility model in the exploded state of the parts. Figure 2 .

[0029] Figure 5 It is a schematic diagram of the position structure of the tool holder connection part of the utility model.

[0030] Figure 6 It is a structural schematic diagram of the utility model after the movable pin and the fitting groove are fitted.

[0031] Figure 7 It is a schematic diagram of the position structure of the fitting groove of the utility model.

[0032] Figure 8 This is a schematic diagram of the position structure of the movable pin of the utility model after being guided by the first guide surface

[0033] Fig. 9 It is a schematic diagram of the position structure of the fixing frame and the end cover of the utility model.

[0034] Fig.10 It is a schematic diagram of the position structure of the fixing frame and the end cover of the utility model, which illustrates the extreme position of the movable pin deflected outward and the extreme position of the movable pin deflected inward.

[0035] Fig.11 It is a schematic diagram of the positions of the movable pin and the elastic member of the utility model.

[0036] Fig.12 It is a structural schematic diagram of a movable pin and a retaining frame of the utility model.

[0037] Fig.13 It is a schematic diagram of the implementation of the utility model.

[0038] Fig.14 It is a schematic diagram of the definition position of the angle a of the utility model.

[0039] As shown in the figure: 1. Base; 1.1. Shaft; 2. Sharpening part; 3. Tool holder; 3.1. Connecting part; 3.11. Accommodating groove; 3.2. Matching part; 3.3. Placement end surface; 4. Positioning part; 5. Fixing frame; 5.1. Retaining frame; 5.11. Matching groove; 5.2. Card slot; 6. Elastic member; 7. First guide part; 7.1. First guide surface; 8. End cover; 8.1. Second guide part; 8.11. Second guide surface; 9. First adsorption pad; 10. Second adsorption pad; 11. Active roller; 11.1. Assembly space; 11.2. Power source frame; 11.21. Power source; 12. Driven roller; 13. Tool; 13.1. Blade. DETAILED DESCRIPTION

[0040] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0041] See also Figure 1-14 As shown, a knife sharpener comprises:

[0042] A base 1, on which a sharpening portion 2 and a knife holder 3 are arranged, wherein the sharpening portion 2 is used to sharpen the blade 13.1 of the knife 13 when in contact with the blade 13;

[0043] The tool holder 3 is rotatable and is used to place the tool 13, and the blade 13.1 of the tool 13 is arranged at an angle a with the sharpening part 2;

[0044] A matching portion 3.2, wherein the matching portion 3.2 is arranged on the tool holder 3;

[0045] A positioning portion 4, wherein the positioning portion 4 is fixedly arranged in a circumferential direction;

[0046] The tool holder 3 is rotated to adjust the angle a between one end surface of the blade 13 . 1 and the grinding surface of the grinding part 2 , and the matching part 3 . 2 rotates with the tool holder 3 to have a position matched with the positioning part 4 to lock the tool holder 3 .

[0047] After adopting the above structure, the knife sharpener of the utility model has the following advantages compared with the prior art: when in use, according to the sharpening angle requirement of the tool 13, the tool holder 3 is rotated until the angle a between the blade 13.1 of the tool 13 and the sharpening part 2 reaches a suitable angle. At the suitable angle, the contact performance between the blade 13.1 of the tool 13 and the grinding surface of the sharpening part 2 is good, so that the sharpening effect is improved. In addition, the adjustable setting of the angle a can be applied to the sharpening operation requirements of different types of tools 13, and the device has good applicability;

[0048] When the matching portion 3.2 rotates with the tool holder 3 to match the positioning portion 4 and locks the tool holder 3, the position of the tool holder 3 is stabilized, and the angle a between the blade 13.1 of the tool 13 and the sharpening portion 2 is stable, so that the blade 13.1 of the tool 13 is polished consistently and evenly, and the sharpening effect is good.

[0049] As an improvement of the present invention, the tool holder 3 is provided with fitting grooves at intervals along the circumferential direction, and the base 1 is provided with a movable pin, which enters the fitting groove to limit the rotation of the tool holder 3. After the tool holder 3 rotates, the movable pin enters the fitting groove, and the position of the movable pin is fixed along the axial direction of the tool holder 3, so that the tool holder 3 cannot rotate, so that the tool 13 is stably supported, and when it contacts the sharpening part 2, the sharpening effect is improved.

[0050] As an improvement of the present utility model, the rear end of the tool holder 3 is provided with a connecting portion 3.1 sleeved on the shaft body 1.1 of the base 1;

[0051] A fixing frame 5 is arranged on the shaft body 1.1, the movable pin is connected to the fixing frame 5, and an elastic member 6 is arranged between the movable pin and the fixing frame 5, the elastic member 6 drives the movable pin head to move elastically forward and backward to enter the fitting groove or move out of the fitting groove.

[0052] The rear end of the tool holder 3 is provided with a connecting portion 3.1, and the inner end of the connecting portion 3.1 is provided with a through hole sleeved on the shaft body 1.1, so that the tool holder 3 can be rotatably arranged, and has the characteristics of stable and reliable operation;

[0053] The outer end of the connecting portion 3.1 is provided with a receiving groove 3.11, and the fixing frame 5 is positioned in the receiving groove 3.11 and fixed to the rear end of the shaft body 1.1;

[0054] The engaging grooves are designed as tooth groove structures and are arranged on the peripheral wall of the accommodating groove 3.11 at intervals along the circumference of the tool holder 3;

[0055] The elastic member 6 is a coil spring, which is disposed between the movable pin and the base 1 to enable the movable pin to float forward and backward;

[0056] When the tool holder 3 is rotated, the front part of the movable pin gradually contacts the top of the groove from the bottom of the groove, the movable pin moves backward, the elastic member 6 is compressed, the front part of the movable pin gradually leaves the fitting groove, and the tool holder 3 loses the limit of the movable pin;

[0057] When the tool holder 3 is rotated and the front part of the movable pin gradually contacts the bottom of the groove from the top of the groove, the movable pin moves forward, the elastic member 6 stretches, and the front part of the movable pin gradually enters the fitting groove, so that the tool holder 3 can be repositioned by the movable pin.

[0058] After the above improvements, the device has the characteristics of compact structure and stable and reliable operation.

[0059] As an improvement of the utility model, the tail end of the movable pin is hingedly arranged with the fixed frame 5, and the movable pin can be deflected along the axial direction of the tool holder 3. The fixed frame 5 is connected with a retaining frame 5.1, and a matching groove 5.11 extending up and down is arranged between the retaining frame 5.1 and the end surface of the fixed frame 5. The lower part of the retaining frame 5.1 is provided with a pin shaft, and the pin shaft is placed in the matching groove 5.11, and can move up and down along the matching groove 5.11, and can be deflected along the axial direction of the tool holder 3 at any position of the pin shaft in the matching groove 5.11;

[0060] The rear end of the connecting portion 3.1 is provided with a receiving groove 3.11, and the arranged matching grooves are arranged on the peripheral wall of the receiving groove 3.11. The position of the rear end of the arranged matching grooves in the receiving groove 3.11 is provided with a first guide portion 7, and the first guide portion 7 has an inclined first guide surface 7.1. When the tool holder 3 rotates forward until the first guide surface 7.1 is in continuous contact with the inner side surface of the movable pin, the first guide surface 7.1 drives the movable pin to deflect axially outward, so that when the tool holder 3 rotates in the reverse direction, the movable pin head and the arranged matching grooves are always in a disengaged position in the moving track of the matching groove;

[0061] The outer end opening of the accommodating groove 3.11 is detachably connected with an end cover 8, and the end cover 8 is arranged to rotate synchronously with the connecting part 3.1. A second guide part 8.1 is arranged on the end cover 8, and the second guide part 8.1 extends into the accommodating groove 3.11 and is located at the front end of the arranged matching groove. The second guide part 8.1 is provided with an inclined second guide surface 8.11. The tool holder 3 rotates in the opposite direction until the second guide surface 8.11 is in continuous contact with the outer side surface of the movable pin, and the second guide surface 8.11 drives the movable pin to deflect axially inward to reset, so that when the tool holder 3 rotates forward, the head of the movable pin and the arranged matching groove are in a position for matching in the moving trajectory of the matching groove.

[0062] The fixing frame 5 is provided with a slot 5.2, and the front part of the movable pin passes through the slot 5.2. When the movable pin deflects inwardly along the axial direction of the tool holder 3, it can abut against the bottom of the slot 5.2, so that the movable pin is in an upright initial position.

[0063] The front end of the first guide surface 7.1 is close to the rear end of the fitting groove, and the rear end of the first guide surface 7.1 is far away from the fitting groove, and the structure is gradually inclined outward from the front end to the rear end. When the tool holder 3 is rotated, the front end to the rear end of the first guide surface 7.1 gradually contacts with the movable pin, which can drive the movable pin to gradually deflect outward along the axial direction of the tool holder 3; at this time, the tool holder 3 rotates, and the moving trajectory of the fitting groove cannot cooperate with the movable pin, and the tool holder 3 is in a non-positioned state.

[0064] The tail end of the second guide surface 8.11 is close to the front end of the engaging groove, and the front end of the second guide surface 8.11 is far away from the engaging groove, and the structure is gradually inclined outward from the tail end to the front end. When the tool holder 3 is rotated, the tail end to the front end of the second guide surface 8.11 gradually contacts the movable pin, which can drive the movable pin to gradually deflect inward along the axial direction of the tool holder 3 until the movable pin is restored to the initial upright state. At this time, the tool holder 3 rotates forward, and the moving trajectory of the engaging groove can cooperate with the movable pin, and the tool holder 3 is restored to a state where it can be positioned.

[0065] After the above improvement, the knife holder 3 can reciprocate and readjust the angle a between the blade portion 13.1 and the sharpening portion 2, which is convenient for users to use and has the characteristics of stable and reliable operation.

[0066] As an improvement of the utility model, a first adsorption pad 9 is provided on the end cover 8, and the first adsorption pad 9 is positioned relative to the first guide portion 7, and the first adsorption pad 9 is used to adsorb and position the movable pin guided and deflected by the first guide portion 7;

[0067] The second adsorption pad 10 is arranged in the receiving groove 3.11. The second adsorption pad 10 is arranged relative to the second guide part 8.1. The second adsorption pad 10 is used to adsorb and position the movable pin guided and deflected by the second guide part 8.1. After the above improvement, when the movable pin guided by the guide part approaches the adsorption pad, it is adsorbed and positioned by the adsorption pad, so that the movable pin is stably in the guided position state, avoiding the device from getting stuck, and further improving the stability and reliability of the device operation.

[0068] As an improvement of the utility model, the grinding part 2 adopts an abrasive belt, and the base 1 is rotatably connected with an active roller 11 and a driven roller 12, the active roller 11 is driven to rotate by a power source 11.21, the active roller 11 and the driven roller 12 are arranged in a transverse arrangement, the abrasive belt is sleeved between the active roller 11 and the driven roller 12, and the grinding surface of the abrasive belt between the active roller 11 and the driven roller 12 is formed into a straight structure. After the above improvement, the abrasive belt is adopted as the grinding part 2, and the abrasive belt is driven to rotate when the power source 11.21 drives the active roller 11 to rotate, and when the abrasive belt contacts the blade 13.1, the blade 13.1 can be efficiently ground.

[0069] The power source 11.21 may be a motor or a mechanism that outputs a rotational torque.

[0070] As an improvement of the present invention, the tool holder 3 is provided with a placement end surface 3.3, one side of the tool 13 is supported by the placement end surface 3.3, and the lower end of the placement end surface 3.3 is arranged to point to the grinding surface of the straight area of ​​the abrasive belt, so as to form a "V"-shaped structural angle arrangement. When sharpening the tool, the user presses one side of the tool 13 onto the placement end surface 3.3, the blade 13.1 exceeds the placement end surface 3.3 and contacts the grinding surface of the abrasive belt, and the user can move the tool 13 forward and backward, or hold the tool 13 firmly so that the abrasive belt can grind the blade 13.1;

[0071] The placement end surface 3.3 is arranged at an angle in a "V" shape. When the tool holder 3 rotates, the angle a between the placement end surface 3.3 and the grinding surface of the abrasive belt is adjusted, thereby adjusting the angle a between the blade 13.1 of the tool 13 on the placement end surface 3.3 and the grinding surface;

[0072] After the above improvements, the device has the characteristics of simple structure, reliable operation and convenient use by users.

[0073] As an improvement of the present invention, the active roller 11 has a hollow assembly space 11.1 inside, a power source frame 11.2 is arranged inside the assembly space 11.1, the power source 11.21 is assembled inside the power source frame 11.2, the output end of the power source 11.21 extends out of the power source frame 11.2 and is coaxially connected to the active roller 11. After the above improvement, the power source 11.21 and the power source frame 11.2 are integrated and assembled in the assembly space 11.1 inside the active roller 11, which reduces the space occupied, makes the device structure more integrated and compact, and is conducive to miniaturization.

[0074] As an improvement of the present invention, a coaxial transmission member is provided at one end of the active roller 11, and one end of the transmission member passes through the base 1, the fixing frame 5, the connecting portion 3.1, and the outer side of the end cover 8 and is connected to a grinding component. After the above improvement, the grinding component rotates synchronously with the active roller 11, and can be used for rough grinding, sharpening, etc. of the blade 13.1, further improving the functionality of the device and facilitating the use of users.

[0075] The grinding component may be a grinding wheel, a wool wheel or other sharpening element.

[0076] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims

1. A knife sharpener, characterized in that: include: A base (1), wherein a knife sharpening portion (2) and a knife holder (3) are arranged on the base (1), wherein the knife sharpening portion (2) is used to sharpen the blade (13.1) of the knife (13) when contacting the blade portion (13.1); The tool holder (3) is rotatably arranged, and is used to place a tool (13), and the blade portion (13.1) of the tool (13) is arranged at an angle a with the sharpening portion (2); A matching portion (3.2), wherein the matching portion (3.2) is arranged on the tool holder (3); A positioning portion (4), wherein the positioning portion (4) is fixedly arranged in a circumferential direction; The tool holder (3) is rotated to adjust the included angle a between one end surface of the blade portion (13.1) and the grinding surface of the grinding portion (2), and the matching portion (3.2) rotates with the tool holder (3) to have a position matching with the positioning portion (4) to lock the tool holder (3).

2. A knife sharpener according to claim 1, characterized in that: The matching portion (3.2) is a fitting groove arranged at intervals along the circumferential direction on the tool holder (3), and the positioning portion (4) is a movable pin arranged on the base (1), and the movable pin can move forward and backward. The movable pin moves forward to the front and enters the fitting groove to limit the rotation of the tool holder (3).

3. A knife sharpener according to claim 2, characterized in that: The rear end of the tool holder (3) is provided with a connecting portion (3.1), and the front end of the connecting portion (3.1) is sleeved on the shaft (1.1) of the base (1) through an inner hole; A fixing frame (5) is arranged on the shaft body (1.1), the movable pin is connected to the fixing frame (5), and an elastic member (6) is arranged between the movable pin and the fixing frame (5), and the elastic member (6) drives the head of the movable pin to move elastically forward and backward to enter the fitting groove or move out of the fitting groove.

4. A knife sharpener according to claim 3, characterized in that: The tail end of the movable pin is hingedly connected to the fixed frame (5), and the movable pin can be deflected along the axial direction of the tool holder (3); A receiving groove (3.11) is arranged at the tail end of the connecting portion (3.1), and the arranged matching grooves are arranged on the peripheral wall of the receiving groove (3.11). A first guide portion (7) is arranged at a position corresponding to the tail end of the arranged matching grooves in the receiving groove (3.11), and the first guide portion (7) has an inclined first guide surface (7.1). When the tool holder (3) rotates forward until the first guide surface (7.1) is in continuous contact with the inner side surface of the movable pin, the first guide surface (7.1) drives the movable pin to deflect axially outward, so that when the tool holder (3) rotates reversely, the head of the movable pin and the arranged matching grooves are always in a disengaged position in the moving trajectory of the matching groove.

5. A knife sharpener according to claim 4, characterized in that: The outer end opening of the accommodating groove (3.11) is detachably connected to an end cover (8), and the end cover (8) and the connecting part (3.1) are arranged to rotate synchronously. A second guide part (8.1) is arranged on the end cover (8), and the second guide part (8.1) extends into the accommodating groove (3.11) and is located at the front end of the arranged matching grooves. The second guide part (8.1) is provided with an inclined second guide surface (8.11). The tool holder (3) rotates in the reverse direction until the second guide surface (8.11) is in continuous contact with the outer side surface of the movable pin, and the second guide surface (8.11) drives the movable pin to deflect axially inward to reset, so that when the tool holder (3) rotates forward, the movable pin head and the arranged matching grooves are in a position that can be matched in the moving trajectory of the matching groove.

6. A knife sharpener according to claim 5, characterized in that: The end cover (8) is provided with a first adsorption pad (9), the first adsorption pad (9) is arranged relative to the first guide portion (7), and the first adsorption pad (9) is used to adsorb and position the movable pin guided and deflected by the first guide portion (7); A second adsorption pad (10) is arranged in the accommodating groove (3.11), and the second adsorption pad (10) is arranged relative to the second guide portion (8.1). The second adsorption pad (10) is used to adsorb and position the movable pin that is guided and deflected by the second guide portion (8.1).

7. A knife sharpener according to claim 1, characterized in that: The grinding part (2) uses an abrasive belt. A driving roller (11) and a driven roller (12) are rotatably connected to the base (1). The driving roller (11) is driven to rotate by a power source (11.21). The driving roller (11) and the driven roller (12) are arranged in a transverse arrangement. The abrasive belt is sleeved between the driving roller (11) and the driven roller (12). The grinding surface of the abrasive belt between the driving roller (11) and the driven roller (12) is formed into a straight structure.

8. A knife sharpener according to claim 7, characterized in that: The tool holder (3) is provided with a placement end surface (3.3), one side of the tool (13) is supported by the placement end surface (3.3), and the lower end of the placement end surface (3.3) is arranged to point to the grinding surface of the straight area of ​​the abrasive belt to form a "V"-shaped structural angle arrangement.

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