A sharpener

Abstract

This utility model discloses a knife sharpener, comprising: a base; a belt sharpening assembly mounted on the base and having an annular belt, the outer surface of which forms a grinding surface, and the belt being driven to circulate along a closed trajectory; a tool holder rotatably connected to the base and having a positioning part, the positioning part being set at an angle to the grinding surface, forming a gap for inserting a tool; and a damping mechanism disposed on the base for applying rotational damping to the tool holder; the tool is inserted into the gap, the positioning part contacts the tool to hold the tool, and the cutting edge of the tool intersects the grinding surface to form a cutting angle α. The angle between the positioning part and the grinding surface is adjusted by rotating the tool holder, thereby adjusting the cutting angle α. This invention is suitable for different tool sharpening needs, and provides good and consistent sharpening results. This utility model relates to the field of knife sharpener technology.

Description

Technical Field

[0001] This utility model relates to the field of knife sharpener technology, and more specifically to a knife sharpener. Background Technology

[0002] As home kitchens and professional catering settings increasingly demand higher levels of sharpness and durability from knives, sharpening tools that can quickly, accurately, and safely maintain knife edges are gradually becoming a market necessity.

[0003] For example, patent number CN202122004387.6 discloses an electric multi-functional fixed-angle grinder, which includes a grinding belt, an electric motor and a pulley transmission mechanism that drive the grinding belt, and a machine housing. When in use, the knife is held so that its cutting edge contacts the grinding belt to obtain grinding.

[0004] However, the above solution also has its shortcomings: it cannot adjust the angle of the knife according to the type of knife and the sharpening condition, and requires the angle to be estimated by hand based on experience, which leads to blade deviation, inconsistent sharpness, and poor sharpening effect. Utility Model Content

[0005] To address the shortcomings and defects of existing technologies, a sharpening tool is provided that is suitable for different tool sharpening needs and provides good and consistent sharpening results.

[0006] A knife sharpener, comprising: Base; A belt abrasive assembly is mounted on the base and is provided with an annular abrasive belt. The outer surface of the abrasive belt forms a grinding surface, and the abrasive belt is driven to circulate along a closed trajectory. A tool holder is rotatably connected to the base and has a positioning part. The positioning part is set at an angle to the grinding surface, forming a gap for inserting the tool. A damping mechanism, mounted on the base, is used to apply rotational damping to the tool holder; The tool is placed within the gap, and the positioning part contacts the tool to hold it, so that the cutting edge of the tool intersects the grinding surface to form a cutting angle α. The cutting edge angle α can be adjusted by rotating the tool holder to adjust the angle between the positioning part and the grinding surface.

[0007] With the above structure, the knife sharpener of this utility model has the following advantages compared with the prior art: When in use, by rotating the knife holder, the size of the cutting angle α between the cutting edge of the knife and the grinding surface can be changed, thereby meeting the grinding needs of different types of knives (e.g., Chinese cleaver, Western chef's knife, etc.). The preferred adjustment range of the cutting angle α is 15-30°. In addition, the positioning part contacts the tool to hold the tool, so that the tool is highly stable during the grinding process and maintains a consistent cutting edge angle α during the grinding process, thereby eliminating the cutting edge deviation error caused by grinding and obtaining a grinding effect with high consistency.

[0008] As an improvement of this utility model, the knife holder is rotatably supported on the base via a rotating shaft; The base is provided with an angle adjustment mechanism, including a knob and a gear transmission mechanism. The knob drives the rotating shaft to rotate through the gear transmission mechanism, thereby causing the knife holder to rotate relative to the base to adjust the included angle.

[0009] As an improvement of this utility model, the gear transmission mechanism includes a driving gear, a first intermediate gear, and a first driven gear; The driving gear is coaxial with the knob, the first driven gear is coaxial with the tool holder, and the first intermediate gear meshes between the driving gear and the first driven gear.

[0010] As an improvement of this utility model, there are two tool holders, which are symmetrically arranged on the left and right sides of the annular abrasive belt. The positioning part of each tool holder is set at an angle to the grinding surface, and each forms a gap for inserting the tool. The two tool holders are supported on the base by rotating shafts. The rotating shafts are adjusted synchronously and equally by the same knob through a synchronous transmission mechanism to achieve the same angle adjustment of the cutting angle α on both sides.

[0011] As an improvement of this utility model, the synchronous transmission mechanism includes a second intermediate gear and a second driven gear; The second driven gear is coaxially arranged with the tool holder on the left side, and the second intermediate gear meshes between the first intermediate gear and the second driven gear.

[0012] As an improvement of this utility model, the belt grinding assembly further includes: The drive wheel is driven directly or indirectly by a drive motor; The driven wheel, together with the driving wheel, tensions and guides the sand belt; The outer surface of the sand belt section between the driving wheel and the driven wheel is set at an angle to the positioning part.

[0013] As an improvement of this utility model, the base is provided with a tension adjustment mechanism, including: The bracket is slidably connected to the base; The tensioning wheel is mounted on the bracket and abuts against the inside of the sanding belt between the driving wheel and the driven wheel; A cam is rotatably mounted on the base, with its cam surface abutting against the bracket. Rotating the cam can drive the bracket to slide, thereby adjusting the tension of the sanding belt. A locking structure is provided between the cam and the base to lock the cam angle after adjustment.

[0014] As an improvement of this utility model, the locking structure includes: The first end face ratchet is fixed to the base; The second end face ratchet is located on the axial end face of the cam and is positioned opposite to the first end face ratchet. The second elastic element is used to press the cam axially against the base, so that the ratchet at both ends engages, thereby locking the cam rotation; The cam rotates clockwise, driving the bracket to move outward to tighten the sanding belt. Pulling the cam forward compresses the elastic element and disengages the ratchet wheels at both ends. This allows the cam to rotate counterclockwise, moving the bracket inward to loosen the sanding belt adjustment.

[0015] As an improvement of this utility model, the damping mechanism includes a locking pin, and the knob is provided with a plurality of positioning grooves along the rotation axis. The locking pin is connected to a first elastic element and is elastically stopped in the positioning groove by the first elastic element.

[0016] As an improvement of this utility model, the positioning part is provided with a positioning surface extending along the width direction of the sanding belt, which is used to fit one side surface of the tool. The positioning surface and the grinding surface are arranged opposite each other, and the gap formed between them remains basically equidistant in the width direction of the abrasive belt to ensure that the included angle is constant.

[0017] As an improvement of this utility model, the positioning part has a magnet embedded in the position corresponding to the positioning surface, which is used to magnetically attract the tool. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the structure of this utility model after the outer shell is hidden.

[0020] Figure 3 This is a partial structural diagram of the outer shell of this utility model after it has been concealed.

[0021] Figure 4 This is a schematic diagram of the angle adjustment mechanism of this utility model.

[0022] Figure 5 This is the utility model Figure 4 A schematic diagram of the structure after the back panel is hidden.

[0023] Figure 6 This is a schematic diagram of the tension adjustment mechanism of this utility model.

[0024] Figure 7 This is the utility model Figure 6 A schematic diagram of the structure of the components in an explosive state.

[0025] Figure 8 This is a half-sectional structural diagram of the present invention.

[0026] Figure 9 This is the utility model Figure 8 Enlarged schematic diagram of the structure at point D.

[0027] Figure 10 This is a partial structural schematic diagram of the present invention.

[0028] The figure shows: 1. Base; 2. Belt sander assembly; 2.1. Sanding belt; 2.2. Drive wheel; 2.3. Driven wheel; 3. Tool holder; 3.1. Positioning part; 3.11. Clearance; 3.12. Positioning surface; 3.13. Magnet; 3.2. Shaft; 4. Damping mechanism; 4.1. Locking pin; 4.2. First elastic element; 5. Knob; 5.1. Positioning groove; 6. Gear transmission mechanism; 6.1. Drive gear; 6.2. First intermediate gear; 6.3. 7. Driven gear; 8. Bracket; 7.1. Tensioner; 9. Cam; 8.1. Cam surface; 10. Drive motor; 11. Chip collection box; 12. Pulley; 13. Second intermediate gear; 14. Second driven gear; 15. Locking structure; 16.1. First end face ratchet; 17.2. Second end face ratchet; 18.3. Second elastic element; 19. Top cover; 10. First mounting base; 11.1. Grinding component; 12. Second mounting base; 13.1. Support platform. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0030] Please see Figure 1-9 As shown, A knife sharpener, comprising: Base 1; The grinding assembly 2 is mounted on the base 1 and is provided with an annular abrasive belt 2.1. The outer surface of the abrasive belt 2.1 forms the grinding surface, and the abrasive belt 2.1 is driven to circulate along a closed trajectory. The tool holder 3 is rotatably connected to the base 1 and is provided with a positioning part 3.1. The positioning part 3.1 is set at an angle to the grinding surface, forming a gap 3.11 for tool insertion. Damping mechanism 4, mounted on base 1, is used to apply rotational damping to knife holder 3; The tool is placed within the clearance 3.11, and the positioning part 3.1 contacts the tool to hold it, so that the cutting edge of the tool intersects with the grinding surface to form a cutting angle α. The cutting angle α refers to the angle between one side of the cutting edge of the tool and the grinding surface. The angle between the positioning part 3.1 and the grinding surface is adjusted by rotating the tool holder 3, thereby adjusting the cutting edge angle α.

[0031] In use, by rotating the knife holder 3, the cutting angle α between the cutting edge and the grinding surface can be changed, thereby meeting the grinding needs of different types of knives (e.g., Chinese cleaver, Western chef's knife, etc.). The preferred adjustment range of the cutting angle α is 15-30°. In addition, the positioning part 3.1 contacts the tool to hold the tool, so that the tool is highly stable during the grinding process and maintains a consistent cutting edge angle α during the grinding process, thereby eliminating the cutting edge offset error caused by grinding and obtaining a grinding effect with high consistency.

[0032] Please see Figure 4 As shown, the tool holder 3 is connected to the base 1 via shaft 3.2; An angle adjustment mechanism is provided on the base 1. The angle adjustment mechanism includes a knob 5. The knob 5 is connected to the shaft 3.2 via a gear transmission mechanism 6. When the knob 5 rotates, it drives the base 1 to rotate along the axis B.

[0033] Users can rotate knob 5, which, through gear transmission mechanism 6, is connected to shaft 3.2, thereby driving base 1 to rotate along axis B. It features simple operation and ease of use.

[0034] The gear transmission mechanism 6 includes a driving gear 6.1, a first intermediate gear 6.2, and a first driven gear 6.3; The drive gear 6.1 is coaxial with the knob 5, and the first driven gear 6.3 is coaxial with the tool holder 3 on the right. The first intermediate gear 6.2 can be a sector gear. The first intermediate gear 6.2 meshes between the drive gear 6.1 and the first driven gear 6.3. Through the transmission of torque by the gears, the user can operate the rotation of the tool holder 3 with a small amount of force, which has the characteristics of saving effort and convenient operation.

[0035] Please see Figure 1 , Figure 4 As shown, there are two tool holders 3, which are rotatable. The two tool holders 3 are symmetrically arranged on the left and right sides of the annular abrasive belt 2.1. The positioning part 3.1 of each tool holder 3 is set at an angle to the grinding surface, and each forms a gap 3.11 for inserting the tool. The two tool holders 3 are rotatably supported on the base 1 via rotating shafts 3.2. The rotating shafts 3.2 are adjusted synchronously and equally by the same knob 5 through a synchronous transmission mechanism to achieve the same angle adjustment of the cutting edges a on both sides.

[0036] During sharpening, the tool is inserted from the front into the gap 3.11 between the tool holder 3 on the right side and the grinding surface. The positioning part 3.1 of the tool holder 3 supports the right side of the tool, so that the left side of the tool contacts the grinding surface. Furthermore, the tool is inserted from the front into the gap 3.11 between the tool holder 3 on the left side and the grinding surface. The positioning part 3.1 of the tool holder 3 supports the left side of the tool, so that the right side of the tool contacts the grinding surface. The above operation can achieve grinding on both sides of the cutting edge, and the two tool holders 3 rotate synchronously in opposite directions to achieve synchronous equal angle adjustment of the cutting edge angle α on both sides, thereby making the grinding effect on both sides of the cutting edge consistent during the grinding operation.

[0037] The synchronous transmission mechanism includes a second intermediate gear 12 and a second driven gear 13; The second driven gear 13 is coaxially arranged with the tool holder 3 on the left side, and the second intermediate gear 12 meshes between the first intermediate gear 6.2 and the second driven gear 13.

[0038] After the above improvements, the gear transmission mechanism 6 is used to realize the synchronous and opposite angle adjustment of the two tool holders 3, which has the characteristics of simple structure and stable and reliable operation.

[0039] Please see Figure 2 , Figure 3 , Figure 5 As shown, the sharpening assembly 2 also includes: The drive wheel 2.2 is driven directly or indirectly by the drive motor 9; Driven wheel 2.3, together with driving wheel 2.2, tensions and guides sand belt 2.1; Among them, the outer surface of the sand belt 2.1 section between the driving wheel 2.2 and the driven wheel 2.3 is set at an angle to the positioning part 3.1.

[0040] By driving the abrasive belt 2.1 to circulate along a closed trajectory in the above manner, the blade can be polished efficiently.

[0041] In some embodiments, there are two driven wheels 2.3, which are spaced apart in the horizontal direction, and the driving wheel 2.2 is located below the gap between the two driven wheels 2.3 to define a triangular closed trajectory.

[0042] Please see Figure 6-9 As shown, to prevent the abrasive belt 2.1 from loosening during use and thus reducing the grinding effect on the cutting edge, the base 1 is equipped with a tension adjustment mechanism, including: Support 7 is slidably connected to base 1; The tensioning wheel 7.1 is mounted on the bracket 7 and abuts against the inner side of the sanding belt 2.1 between the driving wheel 2.2 and the driven wheel 2.3; Cam 8 is rotatably mounted on base 1, and its cam 8 surface abuts against bracket 7. By rotating cam 8, bracket 7 can be driven to slide, thereby adjusting the tension of sanding belt 2.1. The bracket 7 is connected to a spring, which is used to pull the bracket 7 inward so that the inner end of the bracket 7 remains in contact with the surface of the cam 8. A locking structure 14 is provided between the cam 8 and the base 1 to lock the angle of the cam 8 after adjustment. When the sanding belt 2.1 is slack, the rotating cam 8 drives the bracket 7 to move the tensioning wheel 7.1 outward, so as to tighten the sanding belt 2.1; When the sanding belt 2.1 is too taut, the tensioning wheel 7.1 can be moved inward by the bracket 7 to loosen the sanding belt 2.1.

[0043] In some embodiments, symmetrical supports 7 and tensioning rollers 7.1 may be provided between the left and right sanding belts 2.1. Cam 8 is located between the inner ends of the two supports 7. The cam 8 has two rotationally symmetrical cam surfaces, each of which independently abuts against the inner end of the bracket 7. During rotation, the two cam surfaces, with the same diameter, contact the inner end of the bracket 7. This causes the two supports 7 and the tensioning wheel 7.1 to move outward or inward in sync, so as to adjust the tension of the sand belts 2.1 on both sides in sync.

[0044] In this embodiment, the driving wheel 2.2 and the driven wheel 2.3 are respectively provided with pulleys 11, and the pulleys 11 are all fitted with the same belt to prevent the sand belt 2.1 from slipping.

[0045] In some embodiments, the locking structure 14 includes: The first end face ratchet 14.1 is fixed to the base 1; The second end face ratchet 14.2 is disposed on the axial end face of the cam 8 and is positioned opposite to the first end face ratchet 14.1. The second elastic element 14.3 is used to press the cam 8 axially against the base 1 so that the ratchet at both ends engages, thereby locking the rotation of the cam 8. The cam 8 rotates clockwise, driving the bracket 7 to move outward to tighten the sanding belt 2.1. Pulling the cam 8 forward compresses the elastic element and disengages the ratchet wheels at both ends, allowing the cam 8 to rotate counterclockwise and the bracket 7 to move inward to loosen the sanding belt 2.1.

[0046] Please see Figure 4 , Figure 8As shown, the damping mechanism 4 includes a locking pin 4.1, and the knob 5 is provided with a number of positioning grooves 5.1 along the rotation axis 3.2. The positioning grooves 5.1 can be spherical grooves, and each positioning groove 5.1 can correspond to an angle of a cutting edge α. The knob 5 is also provided with corresponding indicator marks so that the user can clearly know the angle of the cutting edge α. Furthermore, the locking pin 4.1 is connected to a first elastic element 4.2, and through the elastic action of the first elastic element 4.2, the spherical head is stopped in the positioning groove 5.1. Once the head of the locking pin 4.1 enters the corresponding positioning groove 5.1, the rotational damping of the knob 5 can be increased, causing it to drive the tool holder 3 to remain in the required position. Since the locking pin 4.1 can flexibly move in and out of the positioning groove 5.1, it will not affect the normal operation of the knob 5.

[0047] Please see Figure 4 As shown, the positioning part 3.1 is provided with a positioning surface 3.12 extending along the width direction of the sanding belt 2.1, which is used to fit one side surface of the tool; The positioning surface 3.12 is set opposite to the grinding surface, and the gap 3.11 formed between them is kept basically equidistant in the width direction of the abrasive belt 2.1 to ensure that the included angle is constant.

[0048] The positioning surface 3.12 and the grinding surface are set at equal intervals in the width direction, so that the entire length of the cutting edge always falls on the same geometric plane, and there will be no offset error during grinding (e.g., small entry angle and large exit angle).

[0049] The positioning part 3.1 has a magnet 3.13 embedded at the position corresponding to the positioning surface 3.12, which is used to magnetically attract the tool. Preferably, the magnet 3.13 can be a soft magnet 3.13, which has a weak magnetic attraction force on the tool and only plays a holding role, which can reduce the possibility of the tool deviating during movement.

[0050] Please see Figure 1 As shown, the base 1 has a detachable chip collection box 10 at the bottom. The chip collection box 10 is located below the abrasive belt 2.1 and is used to collect the chips generated during the grinding process.

[0051] Please see Figure 10 As shown, in some embodiments, the abrasive belt 2.1 between the two laterally arranged driven wheels 2.3 forms a straight, exposed grinding surface. A removable top cover 15 is provided above this grinding surface on the base 1. When the top cover is removed, This allows the cutting tool to contact the flat grinding surface for surface grinding. In some embodiments, the base 1 is provided with a rotatable first mounting seat 16 on the outer side of the corresponding right-side knife holder 3. A grinding component 16.1 (e.g., a grinding component 16.1 for grinding scissors or a grinding component 16.1 for grinding screwdriver heads) can be provided on the first mounting seat. The required grinding component can be exposed for use by rotating the first mounting seat 16. In some embodiments, the base 1 is provided with a rotatable second mounting base 17 at a position outside the corresponding left-side tool holder 3. The second mounting base 17 has a support platform 17.1. By rotating the second mounting base 17, the support platform 17.1 can form a nearly perpendicular angle with the outer surface of the left-side sanding belt 2.1 to accommodate the grinding needs of more types of tools.

[0052] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. A knife sharpener, characterized in that, include: Base (1); The grinding assembly (2) is mounted on the base (1) and is provided with an annular abrasive belt (2.1). The outer surface of the abrasive belt (2.1) forms a grinding surface, and the abrasive belt (2.1) is driven to circulate along a closed trajectory. The tool holder (3) is rotatably connected to the base (1) and is provided with a positioning part (3.1). The positioning part (3.1) is set at an angle with the grinding surface and forms a gap (3.11) for inserting the tool. The damping mechanism (4) is set on the base (1) and is used to apply rotational damping to the knife holder (3); The tool is placed in the gap (3.11), and the positioning part (3.1) contacts the tool to hold it, so that the cutting edge of the tool intersects with the grinding surface to form a cutting angle α. The cutting edge angle a can be adjusted by rotating the tool holder (3) to adjust the angle between the positioning part (3.1) and the grinding surface.

2. The knife sharpener according to claim 1, characterized in that: The knife holder (3) is rotatably supported on the base (1) via a rotating shaft (3.2); The base (1) is provided with an angle adjustment mechanism, including a knob (5) and a gear transmission mechanism (6). The knob (5) drives the rotating shaft (3.2) to rotate through the gear transmission mechanism (6), thereby causing the knife holder (3) to rotate relative to the base (1) to adjust the included angle.

3. A knife sharpener according to claim 2, characterized in that: The gear transmission mechanism (6) includes a driving gear (6.1), a first intermediate gear (6.2), and a first driven gear (6.3). The driving gear (6.1) is coaxial with the knob (5), the first driven gear (6.3) is coaxial with the tool holder (3), and the first intermediate gear (6.2) meshes between the driving gear (6.1) and the first driven gear (6.3).

4. A knife sharpener according to claim 3, characterized in that: There are two tool holders (3), which are symmetrically arranged on the left and right sides of the annular abrasive belt (2.1). The positioning part (3.1) of each tool holder (3) is set at an angle to the grinding surface, and each forms a gap (3.11) for inserting the tool. The two tool holders (3) are rotatably supported on the base (1) via the rotating shaft (3.2). The rotating shaft (3.2) is adjusted synchronously and equally by the same knob (5) through the synchronous transmission mechanism to achieve the same angle adjustment of the cutting angles a on both sides.

5. A knife sharpener according to claim 4, characterized in that: The synchronous transmission mechanism includes a second intermediate gear (12) and a second driven gear (13). The second driven gear (13) is coaxially arranged with the tool holder (3) on the left side, and the second intermediate gear (12) meshes between the first intermediate gear (6.2) and the second driven gear (13).

6. A knife sharpener according to claim 1, characterized in that: The sharpening assembly (2) also includes: The drive wheel (2.2) is driven directly or indirectly by the drive motor (9); The driven wheel (2.3) and the driving wheel (2.2) together tension and guide the sand belt (2.1); The outer surface of the sand belt (2.1) section between the driving wheel (2.2) and the driven wheel (2.3) is set at an angle to the positioning part (3.1).

7. A knife sharpener according to claim 6, characterized in that: The base (1) is provided with a tension adjustment mechanism, including: The bracket (7) is slidably connected to the base (1); The tensioning wheel (7.1) is mounted on the bracket (7) and abuts against the inside of the sanding belt (2.1) between the driving wheel (2.2) and the driven wheel (2.3); The cam (8) is rotatably mounted on the base (1), and its cam (8) surface abuts against the bracket (7). By rotating the cam (8), the bracket (7) can be driven to slide, thereby adjusting the tension of the sand belt (2.1). The cam (8) is provided with a locking structure (14) between it and the base (1) to lock the angle of the cam (8) after adjustment.

8. A knife sharpener according to claim 7, characterized in that: The locking structure (14) includes: The first end face ratchet (14.1) is fixed to the base (1); The second end face ratchet (14.2) is disposed on the axial end face of the cam (8) and is positioned opposite to the first end face ratchet (14.1); The second elastic element (14.3) is used to press the cam (8) axially against the base (1) so that the ratchet at both ends engages, thereby locking the rotation of the cam (8); The cam (8) rotates clockwise, driving the bracket (7) to move outward to tighten the sanding belt (2.1). Pulling the cam (8) forward compresses the elastic element and disengages the ratchet at both ends, allowing the cam (8) to rotate counterclockwise and the bracket (7) to move inward to loosen the sanding belt (2.1) for adjustment.

9. A knife sharpener according to claim 2, characterized in that: The damping mechanism (4) includes a locking pin (4.1). The knob (5) is provided with a plurality of positioning grooves (5.1) along the rotation axis (3.2). The locking pin (4.1) is connected to a first elastic element (4.2) and is elastically stopped in the positioning groove (5.1) by the first elastic element (4.2).

10. A knife sharpener according to claim 1, characterized in that: The positioning part (3.1) is provided with a positioning surface (3.12) extending along the width direction of the abrasive belt (2.1) for fitting one side surface of the tool; The positioning surface (3.12) is positioned opposite to the grinding surface, and the gap (3.11) formed between them remains basically equidistant in the width direction of the abrasive belt (2.1) to ensure that the included angle is constant.

11. A knife sharpener according to claim 10, characterized in that: The positioning part (3.1) has a magnet (3.13) embedded in the corresponding positioning surface (3.12) to magnetically attract the tool.

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