Shaft rotary grinding type knife sharpener with adjustable knife sharpening angle

Abstract

The invention discloses a shaft rotary grinding type knife sharpener with an adjustable knife sharpening angle, which comprises a handle assembly provided with a grinding component which is driven by a motor to rotate around an axis A, and a grinding area used for grinding the blade part of a knife is arranged on the circumferential surface of the grinding component; the movable seat is rotatably connected to the adapter seat through a revolute pair, the adapter seat is detachably connected with the handle assembly, and after connection is completed, a grinding gap allowing a cutting edge to be inserted is formed between the supporting face and the grinding area; the movable seat is rotated to reduce or increase the included angle B of the grinding gap, in the grinding process, the outer side face of the cutter abuts against the supporting face, the blade part of the inner side face of the cutter makes contact with the grinding area, the cutter is moved in the direction tangent to the periphery of the grinding area, and grinding is achieved when the grinding area makes contact with the blade part; wherein the tangential acting force direction E1 generated when the rotating grinding surface makes contact with the blade part tends to be parallel to the moving direction E2; the invention relates to the technical field of knife sharpeners.

Description

Technical Field

[0001] This invention relates to the field of knife sharpener technology, and more specifically to a shaft-rotary knife sharpener with adjustable sharpening angle. Background Technology

[0002] With the increasing variety of household kitchen knives and outdoor knives, users are demanding higher levels of sharpness and precision in blade angle. Currently, most electric knife sharpeners on the market are of a fixed angle type. These types of sharpeners typically use a motor to drive the abrasive belt and grinding wheel to rotate. When using them, the user holds the knife and brings the cutting edge into contact with the abrasive belt or grinding wheel to achieve sharpening. Please see Figure 10 As shown, in the prior art, a grinding machine that uses abrasive belts to grind tools has a force F1 generated when the abrasive belt contacts the tool. This force can cause the tool to move around, resulting in "tool skipping" or "deviation". This causes the cutting edge to deviate from contact with the abrasive belt, leading to uneven grinding, excessive grinding, or insufficient grinding. This damages the geometric parameters of the cutting edge and shortens the tool life. Summary of the Invention

[0003] To address the shortcomings and defects of existing technologies, a shaft-rotary grinding tool is provided that is simple to operate, adaptable to grinding needs with different cutting angles, and offers reliable and more consistent grinding results.

[0004] A shaft-driven rotary knife sharpener with adjustable sharpening angle, comprising: The handle assembly includes a motor and a grinding component that is driven by the motor to rotate about axis A, and the grinding component has a circumferential surface with a grinding area for grinding the cutting edge of a tool. The adapter and the movable seat rotatably connected to the adapter via a rotary joint, and the adapter and the handle assembly are detachably connected. The movable seat is provided with a support surface. The adapter is detachably connected to the handle assembly. After the connection is completed, a grinding gap is formed between the support surface and the grinding area for the insertion of the cutting edge; Rotate the movable seat to decrease or increase the included angle B of the grinding clearance. It also includes a locking mechanism, which is located between the movable seat and the adapter seat, and is used to lock the movable seat after it rotates; During the grinding process, the outer surface of the cutting tool rests against the supporting surface, while the cutting edge of the inner surface of the cutting tool contacts the grinding area. The tool moves along a direction tangential to the outer periphery of the grinding area, and grinding is achieved when the grinding area comes into contact with the cutting edge. The direction of the tangential force E1 generated when the rotating grinding surface comes into contact with the cutting edge tends to be parallel to the direction of movement E2.

[0005] With the above structure, the shaft-rotary grinding tool with adjustable grinding angle of the present invention has the following advantages compared with the prior art: In use, first release the lock on the movable seat through the limit mechanism to allow it to rotate. Rotating the movable seat until the included angle B between the support surface and the grinding area meets the grinding requirements of the corresponding tool, such as: meeting the grinding requirements of kitchen knives, outdoor knives, etc. with different blade angles. After rotation is complete, the movable seat is locked by a limiting mechanism, preventing it from rotating. Furthermore, by placing the cutting tool into the grinding gap and pressing the outer side of the tool against the support surface, the cutting edge on the inner side of the tool can come into contact with the grinding area to achieve grinding. Furthermore, by moving the tool along a direction tangential to the outer periphery of the grinding area, the entire cutting edge can be subjected to the grinding action of the grinding area. When the grinding area comes into contact with the cutting edge, the direction of the tangential force E1 generated tends to be parallel to the direction of the moving tool E2. It will not exert a force on the tool to cause it to move, and the tool will not "jump" or "shift" due to bouncing. Therefore, the tool can always be in close contact with the grinding area, which has the characteristics of excellent grinding effect, avoiding uneven grinding, excessive grinding, and insufficient grinding, and extending the service life of the tool.

[0006] As an improvement of the present invention, at least a portion of the support surface extends in a direction perpendicular to the axis A, for providing guidance and support to the outer side of the tool.

[0007] As an improvement of the present invention, two movable seats are symmetrically arranged along axis A, and both movable seats are connected to the handle assembly through their respective rotating joints, and the two support surfaces are arranged opposite to each other. One support surface is used to abut against the left side of the tool, and the other support surface is used to abut against the right side of the tool.

[0008] As an improvement of the present invention, each of the two movable seats is provided with teeth, and the teeth mesh with each other to form a gear pair; When either movable seat is rotated, the teeth drive the other movable seat to swing in the opposite direction at equal angles around its rotating joint, so that the included angle B between the two support surfaces and the grinding area changes synchronously and equally.

[0009] As an improvement of the present invention, a connecting shaft is provided on the movable seat. The adapter has a shaft hole. The shaft hole is set perpendicular to the axis A. The connecting shaft passes through the shaft hole to form the rotating pair, causing the movable seat to swing relative to the handle assembly about the axis of the shaft hole.

[0010] As an improvement of the present invention, a damping positioning mechanism is provided between the movable seat and the adapter seat. The damping positioning mechanism includes: An arc-shaped groove is provided in one of the movable seat and the handle assembly, with its center coaxial with the movable seat, and the bottom of the groove is provided with a number of positioning recesses at intervals along the circumference. An elastic positioning element is provided on the other and continuously elastically abuts against the arc-shaped groove; When the movable seat is rotated, the elastic positioning member slides within the arcuate groove and can be embedded in the positioning recess to apply a retaining force to the movable seat.

[0011] As an improvement of the present invention, the handle assembly is provided with a hollow connecting portion; The adapter is provided with a connection hole, and the connection hole and the hollow connecting part are detachably connected by a threaded pair. The front end of the grinding component passes through the connecting hole and the hollow connecting part in sequence and extends to a preset position.

[0012] As an improvement of the present invention, the locking mechanism includes a limiting screw, the shank of which passes through the movable seat and is threadedly engaged with a threaded hole on the adapter seat. Rotating the limiting screw can press its end face against or loosen the movable seat.

[0013] As an improvement of the present invention, the movable seat is provided with a coaxial track groove, through which the rod of the limiting screw passes.

[0014] As an improvement of the present invention, the movable seat is embedded with a magnetic suction component, and the suction surface of the magnetic suction component serves as a support surface or is flush with or slightly lower than the corresponding support surface, for magnetically positioning the side of the tool on the support surface. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the assembled structure of the movable seat and handle assembly of the present invention.

[0016] Figure 2 This is a schematic diagram of the structure of the movable seat and handle assembly of the present invention after disassembly.

[0017] Figure 3 This is a half-sectional view of the movable seat and handle assembly of the present invention after assembly.

[0018] Figure 4 This is a schematic diagram of the structure of the movable seat and the adapter seat of the present invention.

[0019] Figure 5 This is a schematic diagram of the structure during the grinding operation of the present invention.

[0020] Figure 6This is a partial cross-sectional structural diagram of the movable seat and adapter seat of the present invention.

[0021] Figure 7 This is the invention Figure 5 Enlarged schematic diagram of the structure at point C.

[0022] Figure 8 This is the invention Figure 4 Enlarged schematic diagram of the structure at point D.

[0023] Figure 9 This is a schematic diagram showing the tangential force E1 generated when the cutting edge of the present invention comes into contact with the grinding area, and the direction E2 of the moving tool being parallel.

[0024] Figure 10 This is a schematic diagram showing the direction of the force applied to the cutting tool when using an abrasive belt for grinding in existing technology.

[0025] Figure 11 This is a schematic diagram of the track groove on the movable seat of the present invention.

[0026] The following components are shown in the figure: 1. Handle assembly; 1.1. Hollow connecting part; 2. Grinding component; 2.1. Grinding area; 3. Movable seat; 3.1. Support surface; 3.2. Connecting shaft; 3.3. Toothed part; 3.4. Angle mark; 3.5. Track groove; 4. Damping positioning mechanism; 4.1. Arc groove; 4.11. Positioning recess; 4.2. Elastic positioning element; 5. Cutting edge; 6. Adapter seat; 6.1. Shaft hole; 6.2. Indicator; 7. Limit screw; 8. Magnetic component; 9. Sanding belt; 10. Motor. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] Please see Figure 1-11 As shown, A shaft-driven rotary knife sharpener with adjustable sharpening angle, comprising: The handle assembly 1 includes a motor 10 and a grinding component 2 driven by the motor 10 to rotate about axis A. The grinding component 2 has a circumferential surface with a grinding area 2.1 for grinding the cutting edge 5 of the tool. In some embodiments, the grinding component 2 has a cylindrical structure, and the continuous annular circumferential surface at the upper end of the cylinder serves as the grinding region 2.1. In some embodiments, the grinding component 2 is detachably connected to the handle assembly 1, and the grinding component 2 can be replaced with different grit grinding areas 2.1 to achieve a variety of grinding effects.

[0029] The adapter 6 and the movable seat 3, which is rotatably connected to the adapter 6 via a rotating joint, the movable seat 3 being provided with a support surface 3.1. The adapter 6 is detachably connected to the handle assembly 1. After the two are connected, a grinding gap is formed between the support surface 3.1 and the grinding area 2.1 for the cutting edge 5 of the tool to be inserted. The grinding gap forms an acute angle B. In this application, the grinding clearance is designed to gradually increase in width from bottom to top. Thinner cutting tools can enter the area below the grinding gap so that the cutting edge 5 contacts the grinding area 2.1. Thicker cutting tools are located in the area above the grinding gap, with their cutting edge 5 contacting the grinding area 2.1; In use, first release the lock on the movable seat 3 through the limit mechanism to allow it to rotate. Furthermore, rotating the movable seat 3 decreases or increases the included angle B of the grinding gap, thereby achieving adjustable control of the grinding angle to adapt to the grinding needs of various knives, such as kitchen knives and outdoor knives with different cutting edge angles. Specifically, when the outer side of the tool abuts against the support surface 3.1, a suitable included angle B can make the cutting edge 5 on the inner side of the tool and the grinding area 2.1 tend to be in a parallel position. Therefore, when the cutting edge 5 and the grinding area 2.1 are in contact, the cutting edge 5 will not be subjected to uneven grinding, excessive grinding, or insufficient grinding.

[0030] After rotation, the movable seat 3 is locked by the limiting mechanism, preventing it from rotating. The stable movable seat 3 provides better support for the tool, allowing the tool to move in the preset direction and maintain a reasonable angle of contact with the grinding area 2.1.

[0031] Furthermore, by moving the tool along a direction tangential to the outer periphery of the grinding area 2.1, the entire cutting edge 5 can be subjected to the grinding action of the grinding area 2.1. When the grinding area 2.1 contacts the cutting edge 5, the direction of the tangential force E1 generated tends to be parallel to the direction of the moving tool E2 (E2 is indicated by the front-back direction in this application). It will not exert a force on the tool to cause it to move, and the tool will not "jump" or "shift" due to bouncing. Therefore, the tool can always be in close contact with the grinding area 2.1, which has the characteristic of good consistency in the grinding effect, avoiding uneven grinding, excessive grinding, and insufficient grinding, and extending the service life of the tool.

[0032] In some embodiments, at least a portion of the support surface 3.1 extends in a direction perpendicular to axis A, providing better guidance and support for the tool, thereby improving the grinding effect.

[0033] Please see Figure 1 , Figure 3 , Figure 4 , Figure 6 As shown, two movable seats 3 are symmetrically arranged along axis A. Both movable seats 3 are connected to the handle assembly 1 through their respective rotating joints, and the two support surfaces 3.1 are arranged opposite to each other. The support surface 3.1 on the left movable seat 3 is used to abut against the left side of the tool, so that the right side of the tool cutting edge 5 contacts the grinding area 2.1 at the required grinding angle. The support surface 3.1 on the right movable seat 3 is used to abut against the right side of the tool, so that the left side of the tool cutting edge 5 contacts the grinding area 2.1 at the required grinding angle; The left and right movable seats 3 respectively position the cutting edges on both sides, so the user does not need to flip the tool, thus improving grinding efficiency.

[0034] In this application, the rotary joints of the two movable seats 3 are arranged parallel to each other. Each of the two movable seats 3 is provided with a toothed part 3.3, and the toothed parts 3.3 mesh with each other to form a gear pair; When any movable seat 3 is rotated, the other movable seat 3 is driven to swing in the opposite direction and at the same angle around its rotating pair through the teeth 3.3, so that the included angle B of the two support surfaces 3.1 relative to the grinding area 2.1 changes synchronously and equally, realizing the one-time adjustment of the grinding angle on both sides, and the grinding angle on both sides is consistent, which greatly reduces the occurrence of edge deviation during grinding operations and significantly improves operating efficiency and reliability.

[0035] In some embodiments, the movable seat 3 is provided with a connecting shaft 3.2. A shaft hole 6.1 is provided on the adapter 6. The shaft hole 6.1 is set perpendicular to axis A. The connecting shaft 3.2 passes through the shaft hole 6.1 to form a rotating pair, so that the movable seat 3 swings relative to the handle assembly 1 around the axis of the shaft hole 6.1. The rotating pair has the characteristics of high accuracy of angle adjustment and high stability, and its structure is simple, with good manufacturability and maintainability.

[0036] Please see Figure 4 , Figure 8 As shown, a damping positioning mechanism 4 is provided between the movable seat 3 and the adapter seat 6. Damping positioning mechanism 4 includes: An arc-shaped groove 4.1 is provided in one of the movable seat 3 and the handle assembly 1, the center of which is coaxial with the movable seat 3, and the bottom of the groove is provided with a number of positioning recesses 4.11 at intervals along the circumference. The elastic positioning element 4.2 is provided on the other and continuously elastically abuts against the arc-shaped groove 4.1; When the movable seat 3 is rotated, the elastic positioning element 4.2 slides in the arc-shaped groove 4.1 and can be embedded in the positioning recess 4.11 to apply a holding force to the movable seat 3.

[0037] In this application, the elastic positioning element 4.2 is a steel ball, which is disposed in a blind hole on the movable seat 3, and a spring is provided between the steel ball and the bottom of the blind hole; The arc-shaped groove 4.1 is provided on the connecting seat, and the steel ball is pre-tensioned by the spring to press against the bottom of the arc-shaped groove 4.1. In some embodiments, the arc-shaped groove 4.1 can be arranged with 5 positioning recesses 4.11, corresponding to the commonly used cutting edge angle range of 12°~24°, with each increment of 3°, satisfying full coverage of Chinese, Western, and Japanese cutting tools. A mark corresponding to the rotation angle of the movable seat 3 is set on the movable seat 3, and a corresponding indicator 6.2 is set on the connecting seat; The elastic positioning element 4.2 achieves instantaneous locking each time it slides into a positioning recess 4.11, so that the movable seat 3 is pre-positioned in the position after rotation, thereby improving the reliability of angle adjustment; In addition, the elastic positioning element 4.2 makes a "click" sound and provides obvious tactile feedback when it enters and exits the positioning recess 4.11. Without increasing extra space and cost, the present invention gives the movable seat 3 clear position feedback and positioning capability, thus improving the user experience.

[0038] Please see Figure 1 , Figure 2 , Figure 3 As shown, the handle assembly 1 is provided with a hollow connecting part 1.1; The adapter 6 is provided with a connection hole, and the connection hole and the hollow connection part 1.1 are detachably connected by a threaded pair. The structure is simple, easy to produce and manufacture, and easy to disassemble and maintain. The front end of the grinding component 2 passes through the connecting hole and the hollow connecting part 1.1 in sequence and extends to the preset position.

[0039] Please see Figure 2 , Figure 4 , Figure 11 As shown, the locking mechanism includes a limit screw 7, the rod of which passes through the movable seat 3 and is threaded into the threaded hole on the adapter seat 6. The rotating limit screw 7 can press its end face against the movable seat 3, restricting the movable seat 3 to the position after rotation, or loosen the movable seat 3 to allow it to rotate. It has the characteristics of simple structure and convenient operation.

[0040] In some embodiments, the movable seat 3 is provided with a coaxial track groove 3.5, through which the rod portion of the limiting screw 7 passes; After the above improvements, when releasing the movable seat 3, it is only necessary to rotate to loosen the limit screw 7, without having to completely disassemble the limit screw 7, which is convenient to operate.

[0041] Please see Figure 7 As shown, the movable seat 3 is embedded with a magnetic component 8. The adsorption surface of the magnetic component 8 serves as a support surface 3.1, or is flush with or slightly lower than the corresponding support surface 3.1. This is used to magnetically position the side of the tool on the support surface 3.1, effectively preventing the tool from shifting or lifting during grinding, maintaining a constant grinding angle, and improving the grinding effect.

[0042] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A shaft-driven rotary sharpening tool with adjustable sharpening angle, characterized in that, include: The handle assembly (1) is provided with a motor (10) and a grinding component (2) driven by the motor (10) to rotate about axis A, and the grinding component (2) has a circumferential surface with a grinding area (2.1) for grinding the cutting edge (5) of the tool. The adapter (6) and the movable seat (3) rotatably connected to the adapter (6) via a rotating joint, the movable seat (3) being provided with a support surface (3.1). The adapter (6) is detachably connected to the handle assembly (1). Upon completion of the connection, a grinding gap is formed between the support surface (3.1) and the grinding area (2.1) for the insertion of the cutting edge (5); Rotate the movable seat (3) to decrease or increase the included angle B of the grinding clearance. It also includes a locking mechanism, which is set between the movable seat (3) and the adapter seat (6) for locking the movable seat (3) after it rotates; During the grinding process, the outer surface of the tool abuts against the support surface (3.1), and the cutting edge (5) on the inner surface of the tool contacts the grinding area (2.1). The tool moves along a direction tangential to the outer periphery of the grinding area (2.1), and grinding is achieved when the grinding area (2.1) contacts the cutting edge (5). The direction of the tangential force E1 generated when the rotating grinding surface contacts the cutting edge (5) tends to be parallel to the moving direction E2.

2. The shaft-rotary grinding tool with adjustable grinding angle according to claim 1, characterized in that: At least a portion of the support surface (3.1) extends in a direction perpendicular to the axis A, for providing guidance and support to the outer side of the tool.

3. The shaft-rotary grinding tool with adjustable grinding angle according to claim 1, characterized in that: Two movable seats (3) are symmetrically arranged along axis A. Both movable seats (3) are connected to the handle assembly (1) through their respective rotating joints, and the two support surfaces (3.1) are arranged opposite to each other. One of the support surfaces (3.1) is used to abut against the left side of the tool, and the other support surface (3.1) is used to abut against the right side of the tool.

4. The shaft-rotary grinding tool with adjustable grinding angle according to claim 2, characterized in that: Each of the two movable seats (3) is provided with teeth (3.3), and the teeth (3.3) mesh with each other to form a gear pair; When any movable seat (3) is rotated, the other movable seat (3) is driven to swing in the opposite direction and at equal angles around its rotation pair through the teeth (3.3), so that the included angle B between the two support surfaces (3.1) and the grinding area (2.1) changes synchronously and equally.

5. The shaft-rotary grinding tool with adjustable grinding angle according to claim 1, characterized in that: The movable seat (3) is provided with a connecting shaft (3.2). A shaft hole (6.1) is provided on the adapter (6). The shaft hole (6.1) is provided perpendicular to the axis A. The connecting shaft (3.2) passes through the shaft hole (6.1) to form the rotating pair, so that the movable seat (3) swings about the axis of the shaft hole (6.1) relative to the handle assembly (1).

6. The shaft-rotary grinding tool with adjustable grinding angle according to claim 1, characterized in that: A damping positioning mechanism (4) is provided between the movable seat (3) and the adapter seat (6). The damping positioning mechanism (4) includes: An arc-shaped groove (4.1) is provided in one of the movable seat (3) and the handle assembly (1), with its center coaxial with the movable seat (3), and a number of positioning recesses (4.11) are provided at intervals along the circumference of the bottom of the groove. An elastic positioning element (4.2) is provided on the other and continuously elastically abuts against the arcuate groove (4.1). When the movable seat (3) is rotated, the elastic positioning element (4.2) slides in the arc groove (4.1) and can be embedded in the positioning recess (4.11) to apply a holding force to the movable seat (3).

7. The shaft-rotary grinding tool with adjustable grinding angle according to claim 1, characterized in that: The handle assembly (1) is provided with a hollow connecting part (1.1). The adapter (6) is provided with a connection hole, and the connection hole and the hollow connecting part (1.1) are detachably connected by a threaded pair; The front end of the grinding component (2) passes through the connecting hole and the hollow connecting part (1.1) in sequence and extends to a preset position.

8. A shaft-type knife sharpener with adjustable sharpening angle according to claim 2, characterized in that: The locking mechanism includes a limiting screw (7), the rod of which passes through the movable seat (3) and is threadedly engaged with the threaded hole on the adapter seat (6). Rotating the limiting screw (7) can press its end face against or loosen the movable seat (3).

9. A shaft-rotary grinding tool with adjustable grinding angle according to claim 8, characterized in that: The movable seat (3) is provided with a coaxial track groove (3.5), through which the rod of the limiting screw (7) passes.

10. A shaft-rotary grinding tool with adjustable grinding angle according to claim 1, characterized in that: The movable seat (3) is embedded with a magnetic suction component (8). The adsorption surface of the magnetic suction component (8) serves as a support surface (3.1) or is flush with or slightly lower than the corresponding support surface (3.1) to magnetically position the side of the tool on the support surface (3.1).

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