JP2005279869A - Electric knife sharpener - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To overcome the inconvenience that the life of the knife is sometimes shortened by the conventional knife sharpener because of damaging a cutting edge of the knife or impossibility of straight sharpening of the knife under the circumstances that the sharpness of a knife has been regarded as important from old times and a conventional knife sharpener brings about easy sharpening of the knife in ordinary homes; and to provide a new knife sharpener which is for use in ordinary homes, can easily impart sharpness to the knife, and is proof against damage at the cutting edge. <P>SOLUTION: The knife sharpener has a pair of rotatable grindstones formed like a truncated cone or the like. The grindstones are arranged so as to define an angle with respect to each other to form a grinding surface, and electrically driven for rotation. The rotation speed of the grindstones under electrical rotative driving is switchable to different values. Further to cope with sharpening of a single-edged knife, the grinding surface is made single-sided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a kitchen knife sharpener for cooking mainly used in general households. It is intended to provide an electric knife sharpener that can be used by ordinary people to sharpen a sharp knife without the need for skill.

As a conventional knife sharpener of this type, the blade edge is sharpened by reciprocating between grindstones using a plurality of grindstones. Also, there are those that reciprocate on a flat grindstone at a low speed by a drive control device, and those that attach a grindstone to a motor shaft and control a rotation switch with a limit switch.

Japanese Utility Model Laid-Open No. 3-55147 Japanese Utility Model Publication No. 3007312 Japanese Utility Model Publication No. 7-20245 Japanese Utility Model Publication No. 6-36755 Japanese Utility Model Publication No. 3096573

Conventionally, as this type, there are a frame, a grindstone provided on the frame in a rotatable manner, having a truncated conical surface shape and having an angle with each other, and a sharpening blade during polishing. There has been proposed a knife sharpener comprising a guide member that steers the blade so as to be pressed against both polishing surfaces and is brought into contact with the polishing surface, and a gutter provided on the frame and surrounding a lower portion of the grindstone. In addition, there has been proposed a knife sharpener that solves the problem that, when sharpening a blade, frictional heat is generated and the blade is dulled, or polishing scraps of the blade enter into the eyes of the grindstone to cause clogging.

By sharply moving back and forth diagonally with the cutter with respect to the axial direction of the grinding wheel having a frusto-conical polishing surface, both polishing surfaces hit the cutter and both side surfaces and sharpen the blade tip as before. It can be said that the polishing can be effectively performed as compared with the above. Further, by providing a guide member that presses the cutting edge to the angle of both polishing surfaces and steers the blade so as to press to the angle of the polishing surface and contacts the polishing surface, the blade surface uniformly hits the grindstone, and the motor The blade surface can be sharpened without undulating like the method of sharpening the structure that is polished against the rotating surface of a disc-shaped grindstone rotated at. However, in these sharpening methods, since the grindstone and the blade are in close contact with each other and reciprocate, the pressing movement of the blade moves and sharpens the grindstone. For this reason, it becomes the form which grinds with a grindstone surface rather than sharpening, and it is not the system which grinds while a cutter surface slides on a grindstone as an original sharpening action.

For this reason, as shown in FIG. 1A and the opposite surface (b), the shape of the grindstone particles is reflected on the blade surface as it is on the blade surface (16), and the particle size of the grindstone is damaged. In addition, the scratch is an oblique scratch that draws a circle, not in a direction perpendicular to the blade surface. A small circle is generated when touching the inner periphery of the grinding wheel surface, and a large circle scratch is generated near the outer periphery. These scratches are repeated at the same time, and the direction of these scratches is opposite to each blade surface. For these reasons, the sharpened blade edge and the blade surface are jagged, and the blade edge is scratched and the blade edge is not evenly thick and causes a spilled state. Moreover, it becomes easy to spill a blade by these cracks at the time of use. Moreover, it has also resulted in shortening the lifetime of a blade itself from these things. Also, a grindstone having a truncated cone surface shape and an angled grinding surface is formed, and the grindstone is rotated and polished by the resistance of particles on the grinding surface with the power to reciprocate the blade itself. Therefore, it does not work when the polishing surface is only on one side, and therefore, there is no one having only the polishing surface on one side. As a result, single-edged knives and the like could not be sharpened.

Therefore, in the present invention, without crushing the blade edge, in order to sharpen the blade surface uniformly, it is rotatably provided on the frame, and has a grindstone having a truncated conical surface shape and an angled surface with each other, A guide member that steers the blade so that the blade is pressed against the two polishing surfaces during the sharpening process and contacts the polishing surface is provided, and the grindstone slides the blade surface by rotating the grindstone with a motor. The purpose of this study is to provide an electric knife sharpener that can sharpen the blade surface smoothly and reduce scratches by sharpening. In addition, a more accurate sharpening speed can be obtained by controlling an appropriate rotation speed with respect to the shape of the blade material or the knife. In addition, the water wheel spring attached to the rotating part prevents clogging of the grindstone and burning of the grindstone. In addition, a knife with a single blade can be sharpened by not using a grindstone surface on one side of the polished surfaces formed at angles to each other.

The present invention of claim 1 is a knife sharpener comprising a frame and a grindstone shaped like a truncated cone that can rotate on the frame. This is an electric knife sharpening device in which the rotation of the grindstone is electrically driven.

The present invention of claim 2 is a knife sharpener equipped with a frame and a grindstone shaped like a truncated cone that can rotate on the frame, and is a grindstone shape that does not have at least a pair of the grindstone and a polishing surface for single edge sharpening. The rotary guide plate is an electric knife sharpener having a grindstone portion that forms an angle with each other and has a combined polishing surface, and the rotation of the grindstone is electrically driven.

According to a third aspect of the present invention, the electric knife sharpener according to the first to second aspects is provided with a rotation speed switching mechanism, a control mechanism, and a control circuit capable of changing the polishing speed depending on the material of the blade. Is.

As described above, the present invention sharpens the blade of the knife without crushing by rotating a grindstone having a surface shape of a truncated cone and having a polishing surface that forms an angle with each other, as described above. As shown in Fig. 1 (c), the blade edge and blade surface are sharpened smoothly and the blade edge is less likely to spill, resulting in a longer knife life. I think this is a very useful invention for sharpening knives.
Hereinafter, embodiments of the knife sharpener of the present invention will be specifically described with reference to the drawings.

2 and 3 show an embodiment of the knife sharpener of the present invention. The knife sharpener (1) is provided with a water tank (3) attached to a frame (2), and the water tank (3) is a cover (15). The cover (15) is provided with a guide (4) for guiding the knife (7). A rotating shaft (8) supported by a bearing portion (6) passes through the water tank (3), and the rotating shaft (8) has a truncated cone surface shape and forms an angle with each other. A grindstone (5) having a polished surface is provided. The relationship between the guide plate (4) and the rotating shaft (8) is displaced at an angle of about 10 degrees from the right angle. The rotating shaft (8) transmits the power of the motor (9) by means of a gear (10), and the rotating shaft (8) is constituted by a metal rod having a square or hexagonal cross section. The motor (9) is supplied with power from the battery (18) via the switch (11) and the slide resistor (12), and is also provided with an LED lamp (13) indicating the operating state. Further, the water splash water wheel (14) applies water from the water tank (3) to the grindstone part (20). Although not shown, a dry battery (18) is used as a power source here, but a rechargeable battery or an external power source may be used. Further, although the rotation resistance of the motor (9) is controlled using the slide resistor (12), the motor rotation speed may be limited by a current limiter, a voltage regulator or the like.

FIG. 4 shows another embodiment of the present invention, a grindstone (5) having a truncated conical surface shape attached to a rotating shaft (8) and having an abrasive surface forming an angle with each other; A combination of a rotating guide plate (5a) made of, for example, plastic that has a grindstone shape without a surface is shown.

FIG. 5 shows the periphery of the power transmission portion (21) of the present invention. (A) rotates the rotating shaft (8) by the intermediate gear (10b) through the intermediate gear (10a). (B) rotates a rotating shaft (8) by a large gear (10d) through a small gear (10c). The rotation (a) of the rotating shaft (8) is at a high speed and (b) is in a low speed state. Switching from (a) to (b) indicates that the switching lever (17) can be switched by moving in the lever operating direction (17a).

An enlarged photograph of a knife that has been rotationally polished by a conventional reciprocating motion and an enlarged photograph of the same magnification polished with a sharpener of the present invention, using the same grindstone corresponding to alumina ceramic No. 400 (Japanese Industrial Standard) is there. About # 400. It is a top view of the Example of this invention. It is a top view including the partial cross section of the Example of this invention. It is a top view of the other Example of this invention. It is a top view for shifting change explanation of other examples of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Knife sharpener 2 ... Frame 3 ... Water tank 4 ... Guide 5 ... Grinding wheel 5a ... Grinding stone 6 without grinding | polishing surface ... Knife 8 ... Rotating shaft 9 ... Motor 10 ... Gear 10a ... Medium gear 10b ... Medium gear 10c ... Small gear 10d ... first gear 11 ... switch 12 ... slide resistor 13 ... LED lamp 14 ... water splash wheel 15 ... cover 16 ... blade surface 17 ... switch lever 17 ... labor operating direction 18 ... dry cell 20 ... grinding wheel 21 ... power Transmission unit

Claims (3)

In a knife sharpener equipped with a frame and a grindstone shaped like a truncated cone that can rotate on the frame, at least one pair of the grindstones is angled with respect to each other and provided with a polishing surface, and the rotation of the grindstone is electrically driven Electric knife sharpener. In a knife sharpener equipped with a frame and a grindstone shaped like a truncated cone that can rotate on the frame, at least a pair of the grindstone and a grindstone-shaped rotation guide plate having no grinding surface are angled to each other for sharpening a single blade. An electric knife sharpener having a grindstone portion with a combination piece polishing surface and electrically driven by rotation of the grindstone. 3. The electric knife sharpener according to claim 1 or 2 provided with a rotation speed switching mechanism, a control mechanism, and a control circuit capable of changing a polishing rate depending on a material of a blade.

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