JPH09323242A - High speed, precision honing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a honing unit that is able to make up a precise and rigid cutting edge speedily. SOLUTION: In this high speed knife honing unit, the surface of a first rotary abrasive member is a circular truncated cone itself, making up a first cutting edge face with a very small groove and minute burr. A second state 8 is a new compound conical body formed by a honing wheel composed of a minute abrasive embedded in an epoxy matrix. This honing wheel hones the cutting edge produced at a first stage 7 into the form of an inverted triangle with a radius of curvature at typically several microns (μm) or yet smaller apex (cutting edge) in accordance with the hardness of knife steel. A unique cutter holding mechanism presses a knife edge down to the precisely regulated angle in regard to each of grinding (first) and honing (second) stages 7 and 8. Since yet larger grinding force is manifested in proportion to the yet thicker knife edge, the number of honing times is almost the same as a general extent ranging from a small fruit peeling knife (6 inches) to a kitchen cleaver of a large chef knife (10 inches).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sharpening device for a knife having a blade of a type using a disc-shaped sharpening member.

[0002]

BACKGROUND OF THE INVENTION In domestic and commercial knife sharpening devices, a surface speed of 200
It incorporates a high speed cylindrical grinding wheel that rotates at 0 feet per minute (US Pat. No. 2,775,075). Such sharpeners usually leave behind large burrs (ie, the metal blisters on the unpolished cutting surface that remain at the end of the blade edge) and are prone to overheating the edges. The presence of fairly large burrs is undesirable. Roughly,
It produces uneven and weak cutting edges.

US Pat. No. 4,627,194 overcomes the problem of large burrs in a special way by the addition of additional faces (typically three faces), each of which is followed by a slightly larger included angle. A sharpening device is described. Furthermore, each trailing surface is formed with finer grit until a very small grit is used for the final (third) surface. Thus, burrs do not become extensive or excessive and the effect is desirable for commercial environments, while the formation of a well-formed strong cutting edge takes more time.

Prior art sharpening devices for making large burrs require post-treatments, for example with steel rods or cloth buffing wheels, to trim the burrs. Sharpening steel and cloth wheels are time consuming and usually
A weak cutting edge that requires frequent re-sharpening.

Many of the prior art home-based sharpening devices provide poor control of the blade position and the angle of the knife cutting surface with respect to the sharpening disc. Although U.S. Pat. No. 4,627,194 describes a magnetic hold-down mechanism, it is possible for a user to forcefully resist a magnetic field. The prior art of other commercially used sharpening devices provides a complicated and unreliable mounting mechanism to ensure the correct knife position and the angle of the cutting surface of the cutlery. Users find these to be cumbersome and cumbersome to use.

Another disadvantage of many prior art sharpening devices is that they provide uncontrolled force on the grinding surface of the knife face. Therefore, the sharpening speed changes depending on the thickness of the blade. Moreover, this lack of control can cause the user to exert too much force, thus locally overheating the knife edge, reducing the edge hardness or creating a non-uniform edge.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a sharpening device capable of quickly forming a precise and durable cutting edge.

[0008]

SUMMARY OF THE INVENTION The present invention provides a unique sharpening device that is capable of quickly forming a cutting edge that is superior to the sharp razor of a wide range of common blades. This is achieved by a unique combination of one or more sharpening sharpening stages, followed by a new honing sharpening stage. Precision cone shaped abrasive coated discs can be properly modified by a soft cone shaped abrasive in the subsequent honing stage to form a very sharp and durable cutting edge , Used to form a first cutting edge having a geometric shape and a burr. The abrasive coated disc may be used on various blades, but is particularly suitable for knife blades.

Many of the disadvantages of prior art knife sharpening devices are significantly reduced by the sharpening method and apparatus of the present invention.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the sharpening device (36) of the present invention.
The sharpening device (36) includes a first sharpening sharpening section or stage (7) and a honing stage (8), as shown in FIG. The sharpening sharpening stage has a truncated cone-shaped disc (5, 5) coated with two abrasives, and the honing stage has
A frustoconical disk (1 with two abrasives embedded in it)
5, 15). The sharpening and honing stages each have a disk mounted on a slotted hub (35) mounted on and rotated by a drive shaft (9) as shown in FIG. Pin (86) that goes through the shaft (9)
This secures a hub with a slot that can slide on the shaft. A spring (6) is provided between each pair of discs to generate a drag force on the discs so that the discs are moved along the shaft while sharpening the knife edge. The pins (9) serve to position the disc correctly and to drive the hub on which it is mounted when at rest. In the sharpening sharpening stage and the honing stage, the knife blade (4) is provided along the guide surface of the knife so as to lean against the guide surface of the knife in order to keep the sharpening angle constant. A tough, anti-friction and wear-resistant edge guide (3) that allows the angle between the blade and the sharpening surface to be fixed and constant.
3) It is stably positioned and guided by the small groove cut into it. In FIG. 1, a single plastic support spring (1) provides the force to lean and hold the knife against the blade guide surface (2). When the knife is passed through the sharpening device, the cutting edge of the knife is cut into the cutting edge guide (33) so that it can be positioned stably by the cutting edge guide. In this way, the knife is perfectly fixed horizontally on the guide surface of the knife as it is passed through the sharpening stage with respect to the rotary abrasive disc (5) of FIG. By forming the groove (37) in the cutting edge guide (33), the stability in the sharpening process is further increased, but such an operation is not always essential in the present invention. Blade (4)
Is held reasonably stably only by the spring (1) as a spring member made of plastic. When used to sharpen a conventional knife, the knife is alternately passed through the left and right slots, first through the sharpening stage and then through the honing stage until a very sharp edge is obtained.

The superior cutting edge formed by the present invention is
It depends on the formation of the special cutting edge geometry of the sharpening stage or of the stage which carries out the specific honing finishing action by means of a honing disc containing an abrasive of suitable flexibility. The sharpening and honing stages use conical discs that are driven at appropriate speeds to achieve a particular function and quickly create a very sharp cutting edge. Novel means of stably positioning the blade and controlling the sharpening angle have been used in both sharpening and honing stages. The sharpening discs (5, 5) are typically made of metal about 1/16 inch thick with a frustoconical shape, the surface of which is inclined at various angles from vertical to the conical axis. ing. The conical surface is coated with a layer of abrasive-preferably diamond-that cleanly excises with little heating.

The polishing rate applied to the blade edge of the knife is controlled so as to eliminate the effect of reducing the temperature of the blade by heating. The sharpening disc (5) and the honing disc (15) are 1,3
Rotating at speeds in the range of 00 to 1,600 rpm, the blade edge of the knife contacts the disk at a radius in the range of 0.5 to 0.9 inches, preferably about 0.75 inches. In this way, the linear velocity during sharpening is well below the rate at which overheating occurs in diamond-coated sharpening discs (5) of about 1,000 feet per minute.
About 750 to 400 feet / minute.

FIG. 8 is an enlarged view of the sharpened portion showing the knife blade (4) placed between the plastic support spring (1) and the blade guide surface (2). The force of the plastic spring is sufficient to fully secure the knife while leaning against the guide surface of the knife so that the user only has to pull the knife with the sharpening device. When the knife is moved downward in the direction of the knife edge guide (33), the knife comes into contact with the hard rotary sharpening disc (5) and the knife edge surface makes physical contact with the knife edge guide (33). Until the center of the sharpening stage, the sharpening disc is moved along the axis (10) against the spring (6) as spring means. The blade edge of the knife is a small groove (3
7) is formed and is firmly fixed to the blade guide surface (2). The angle defined by the angle of the blade guide surface (2) is fixed exactly, this angle being ± 0.5 ° over the entire length of the knife blade (4) while being pulled out by the knife sharpening device (36). Maintained.

The location of the contact point and the groove (37) that is subsequently formed by the knife edge leaning against the knife edge guide (33) varies with the thickness of the knife (4) at that edge. By forming the groove (37), the cutting edge can be fixed so as not to move further in the lateral direction. Alternatively, the groove (37) may be formed in advance.
It is important that the material used to construct the knife edge guide (33) is selected to be abrasion resistant, highly antifriction and highly tough. Surprisingly, it has been found that high molecular weight polypropylene and ultra high molecular weight polyethylene with the required lubricity and toughness do not damage the ultrafine cutting edges formed by the honing finishing method described herein. . Even more surprisingly, the material was shown to improve the edge quality slightly. Such cutting edge guides are designed to be easily upside down to expose new areas and to be easily replaced in the event of excessive wear. These cutting edge guides (33)
The finding that can be used to act as a stop and stop for the blade (4) without damaging the cutting edge is that the abrasive material on the sharpening disk can be removed from the cutting edge (rather than into the cutting edge). is important. The blade edge is pressed against the blade edge guide (33) by the force or thrust applied to the blade by the movement of the abrasive. Without these edge guides, the knife would be stuck between the disc and the guide structure unless the direction of rotation of the disc was reversed. When rotated in the opposite direction, a very rough burred cutting edge is formed in the sharpened portion, and the knife formed by such a burred cutting edge cuts and breaks the honing disc.

The sharpening force is the spring (6) in FIG.
Is a function of the thickness of the blade (4) at the point of contact with the sharpening disc (5). FIG. 8 shows that a thick blade moves the sharpening disc (5) more than a thin blade as in FIG. FIG. 7 shows a specific relationship between the displacement of the spring and the force applied to the disc. The spring is designed to have a reasonably finite force even with zero disk displacement. The preferred force range is about 0.1 to 0.15 along the shaft.
For displacing the disc by an inch, approximately 0.6 to 1.
It's four pounds.

Support Spring: The support spring (1) of FIGS. 8 and 9 is made of plastic such as methyl methacrylate polymer (eg, trademark of Lucite or Plexiglass) or sheet metal such as stainless steel. 2 is an elongated inverted U-shaped structure. The spring arm (12), which is about 30-60 mils (1 mil is 0.001 inch) thick if made of plastic, has a tip of the arm as shown by the right arm in FIGS. The part extends downward from the shoulder part (30) of the inverted U-shaped structure without the knife of the rest part of the sharpening device against the lower part of the guide surface (2) of the knife touching. When the knife is inserted between the guide surface (2) of the knife and the spring (1), the arms (12) of the spring bend along the longitudinal direction as shown in FIGS. Matches the shape of the blade surface. The thickness of the spring material is carefully chosen so that it bends reasonably to match the lower portion of the blade surface. Spring is normal (no knife inserted)
In position, the end of the spring is designed to push the guide surface (2) of the knife to generate the initial force. The spring is supported at the upper midpoint by the boss (20) of the structural support and is fixed in place by the pin (18).
More than one boss may be used along the length of the spring. The holes in the spring (1) and the clearance of the supporting boss allow for a wider range of knives of varying thickness to be utilized to accommodate the spring action and the resulting forces and the horizontal orientation of the spring to modify the compatibility of the spring with the knife surface. It can be tilted slightly in the vicinity or changed so that it can move laterally. Preferably, the spring is from the front (front side) to the back (back side) of the sharpening sharpening stage.
It is designed to have a length that extends along the longitudinal direction of the guide surface of most knives. A special form of such a spring is that it maximally covers the front and / or back part of the opening of the spring to limit accidental access of a human finger to the sharpening disc and honing finish disc areas where damage occurs. One including a guard part (31) shown in the silhouette of FIG. The spring (1) is of an initial shape such that it closely fits the guide surface of the knife when it is molded or requires that the arms be placed towards each other to accommodate the guide surface of the knife. It may be formed in any shape. The latter is preferable because it gives a larger holding force to the blade surface when the spring is inserted between the spring and the guide surface of the knife. The latter is the preferred molding shape as the applied force provides greater stability to the blade.

Plastic support spring (1)
Is bent more with a thicker blade than with a thinner blade, resulting in a greater holding force of the blade against the guide surface (2) of the knife. The support spring (1) shown in FIGS. 8, 9 and 11 is fixed to the top of the spring by a sliding fit pin (18) in a hole (19) through a support member (20) such as a boss. For thick knives, the flexible spring can also be applied to such knives because it changes its shape considerably as shown in FIGS. 8, 9 and 11. For the thickest blade (4), the spring (1) will match the face of the blade most of the way along the length of the arm, and for the thickest blade,
The shoulder portion (30) of the spring (1) comes into contact with the blade (4) to provide a portion having a supporting force. With thicker blades, the spring (1) will tilt slightly or move laterally until the midpoint opening presses firmly on the supporting boss (20). Longer springs are also included in the method to increase bearing capacity.

Knife edge formation : Due to the method of forming the knife edge used in the present invention, less than 45 seconds for knives not previously sharpened by the apparatus of the present invention and previously sharpened by the apparatus of the present invention. When the sharpened knife is re-sharpened, less than 20 hours results in a stronger cutting edge with better sharpness than known razors. This results in a very sharp cutting edge which is noticeably quicker. Specifically, a knife previously sharpened in accordance with the present invention can be sharpened again and restored to its original sharpness simply by passing it through the "honing" stage (8) of FIG. Such re-polishing is performed by the user as shown in FIG.
It can be repeated up to 5 times before feeling the need to "re-sharpen" the knife on the Sharpening Sharpening Stage (7).

Sharpening and sharpening stage: The knife edge surface is a distance of about 45-80% of the disc radius above the center line (B) of the disc, as shown along line (A) of FIGS. 4 and 20. And is preferably in contact with a conical sharpening disc. The position of the line is preferably selected so as to form a groove in the plane in a so-called unidirectional manner at an angle of 20 ° or more with respect to the cutting edge. [The microgrooves are perpendicular (90 °) to the cutting edge when contact occurs at line (B) along the diameter line of the disc. ] The knife is inserted at an angle by the sharpening sharpening stage (7) and the guide surface of the knife of Figures 1 and 8 so that the cutting edge of the knife approximately matches the upper surface of the frustoconical sharpening disc (5) part. It In this way, the abrasive-coated sharpening disk (5) creates substantially unidirectional microgrooves on the surface that extend in the direction of the cutting edge and leave fine cuts along the cutting edge. It is particularly preferable to use diamond as the abrasive because it can form fine grooves that are well aligned; other abrasives easily stain the grooves, leaving grooves with irregular shapes and intervals. Only the upper front part of the sharpening disc (FIGS. 8 and 18) contacts the knife face. This is contrary to the implications of flat disks and / or abrasive movements towards the inside of the cutting edge.

The sharpening disk is preferably made by electroplating diamond into a thin metal frustoconical structure having a metal thickness of about 0.030 inch. Of course, it can also be thickened. What is important is that the diamond is used as an abrasive because it is extremely hard, durable and long lasting, which keeps the shape of the diamond-plated conical disc for a very long time. Because you can. In contrast, abrasive stone, bonded alumina or bonded carborundum wheels lose their shape and bevel outline very rapidly at the point of contact with the tool during use. Such an alternative would not work in a precision sharpening device, as described herein, and the angular relationship of the sharpening angles would result in optimal work and formation of the ultra-sharp cutting edge found in this sharpening device. On the other hand, it is extremely marginal.
Such a solid grinding wheel is totally impractical for other reasons: it heats the cutting edge tremendously, lowers the overall temperature of the blade, and makes few specific grooves across the surface. The use of diamond abrasives on a hard foundation is essential to the optimum operation of this sharpener. Spring tension, which presses the diamond against the knife surface, as described here,
Care must be taken to optimize polishing speed and groove formation.

The number of microgrooves formed in the sharpening step along the first surface depends on the rotational speed of the truncated cone disk coated with the abrasive, the size of the abrasive grit, the point of contact with the disk and the user. Depends on the speed at which the knife moves across the sharpening disc. Wheel speed 1300-16
At 00 rpm, grit size 140/170, and at the point where the knife contacts the disk, the groove spacing along the cutting edge is on the order of 0.0005 to 0.005 inches, typically about 0.001 inches. The size of the burr is
It varies along the cutting edge, but is generally less than 0.002 inches and typically has a length in the range of 0.0004 to 0.001 inches.

In FIGS. 4 and 18, the trajectory (A) of the knife edge that intersects the disc surface (5) is along the chord of the frustum of the truncated cone, and the trajectory in such a conical surface is actually Is slightly parabolic in shape. The nominal trajectory is typically tilted 2-10 ° with respect to the axis of rotation reference for the sharpening disc (H), as shown in FIG. The benefit of this design is that the knife is formed at some point with the conical surface of the abrasive, or with a small line (approaching the point) that is more evenly formed than the entire length of the abrasive that contacts the blade, giving curved microgrooves. In contact.

Throughout this disclosure, the shape of the surface of the disc is referred to as a truncated cone. This is the optimum shape. This is because the curvature of the surface is small at the point where the cutting edge of the knife contacts the abrasive. The small curvature tends to create a cone with a small angle, which tends to make the contact with a small line. The greater the curvature, the smaller the line of contact until the true point contact is approached. Other curved surfaces can be used, such as large radius spheres, parabolas, oval surfaces, or special contours. The conical shape tends to match the knife guide structure well, allowing the cutting edge of the knife to come into contact with the polishing surface near the front of the sharpening device to sharpen and honed near the handle of the blade. Thus, although the cone shape is close to the optimum shape, other shapes can be used during both the sharpening or polishing steps.

During the sharpening stage, a series of microgrooves (29)
Are preferably made across a surface extending to the cutting edge, as shown for example in FIGS. 13 and 14. These grooves (2
9) is further modified and sharpened in the next honing step to retain the microgroove structure as shown in FIG. 17, but leave what the chef calls a "bite" at the cutting edge. To form a super sharp cutting edge. Here, the bite refers to a cutting edge that can easily start cutting food or other materials. The knife edge feature or "feel" can be adjusted by controlling the depth and number of grooves per inch and by the degree of subsequent polishing. 100 to 600 selected
Depending on the grit size of the number diamond, it is possible to create a cutting edge that has a substantially different "feel" when cut in various ways. The 140/170 size grit can provide the cutting edge preferred by many professional cooks. The sharpening step is designed to form a cutting edge with microgrooves 29 running down the surface, as shown in FIGS. 13-14 for the cutting edge, while at the same time the burr 11 shown in FIGS. Made. The word burr is used to describe an extension at the cutting edge that is often inconsistent in shape and that the angle of inclination of the final surface near the cutting edge deviates from the geometric extension in a cross-sectional view. . The burr 11 made at the sharpening stage is
FIG. 16 is a distorted geometrical extension of the surface (19) which is shown in the enlarged cross-section of FIG. 15 and which is finally exposed to the polishing surface. After the burr has been formed in the sharpening sharpening position (7) shown in FIG. 1, the knife is placed in the polishing position 8 shown in FIG. 1, where the burr (11) is the unique polishing disc (shown in FIG. 11). 15) will be contacted. The knife guide surface in the polishing step is set at a slightly larger (a few degrees larger) angle to the vertical than in the previous sharpening step. In the sharpening stage, each of the two knife guide surfaces is tilted about 15-25 ° from the vertical, as shown in FIG.
The specific angle V shown in is selected with reference to the subsequent sharpening in the polishing stage. Generally, the guide surfaces are inclined at 20 ° to the vertical, and the surfaces can be on either side of the cutting edge, so that two surfaces can be created that meet at about 40 ° apart at the cutting edge. In the sharpening stage, the surface of the truncated cone coated with each abrasive is tilted about 2-10 ° with respect to the normal of the cone drive shaft. Generally, they are tilted 2 °. See angle C in FIG.

Generally, the cutting edge of the knife is inclined about 3 ° with respect to the horizontal plane, as shown as angle K in FIG.
It is lower in the first half of the sharpening stage and above the horizontal in the latter half, which is more suitable for the user, and in the first half of the sharpening stage the user can rest the cutting edge moderately with the cutting edge guide. Similarly, there is a cutting edge guide behind each knife guide surface that can be used to rest and assist in the blade guide. Furthermore, during the sharpening phase, the respective horizontal axis of the knife guide surfaces (the horizontal axis used here is defined as the horizontal line lying on the surface of these guide surfaces) is relative to the normal to the drive axis of the truncated cone disk. Then, at a relative angle H, it is approximately the same as the tilt angle C in FIG. 10, and is tilted as the surface of the truncated cone (5) which is relatively perpendicular to the drive axis in FIG. The relationship of these angles is guided by the knife guide surface, so that the blade edge of the blade (4) passes through the upper front quadrant of the truncated cone disk (5) and is above the center of the disk, Pass along a line transverse to the disc somewhat parallel to the line drawn on the conical disc surface inclined at an angle K. Here, as shown in FIGS. 4 and 18, the angle K of FIG. 4 with respect to the horizontal plane is about 3 °.

The relationship between these complex angles is that the blade edge of the knife is in the front quadrant of the upper part of the disc in both steps (see FIG. 18).
And the upper right quadrant of 20) at a point along the predetermined line A which ensures contact with the conical polishing surface. The cutting edge of the knife does not contact the disc in the upper rear quadrant.
It is critical that the knife edge should contact the honing wheel only at the point where the surface of the honing wheel separates from the cutting edge, due to the ultra-sharp cutting edge obtained with this sharpening device during the polishing process. The ultra-sharp cutting edge formed will be unlucky if it contacts the wheel at any point where the abrasive moves to the cutting edge. The sharp edge sharpens the surface of the polishing disc immediately, destroying both the disc and the formed cutting edge.

Polishing Stage The polishing disc (15) is designed to bend at 14 in FIG. 12, ie at the point of contact with the burr (11). The size of the abrasive particles (13) is typically 5 microns, and when continuously contacted with the micromachine, the surface of the burr (11) left in the sharpening stage, and the disc, the burr will be It is removed, leaving a small face along the existing cutting edge. For example, FIGS. 16 (A) and 17
As shown in FIG. 2, when the both surfaces are repeatedly polished, the minute object polishes the burr to form the outer shell (16). This is typically a new small face whose beveled surface typically has a height (h) on the order of 10 microns and a radius of curvature (r) on the cutting edge of the order of a few microns. Leave things. The angle of the first large surface pre-made in the sharpening stage is smaller than the angle of the secondary micro-surface made of the polished disc surface. The angular relationship in the polishing steps described below ensures that the protruding burrs first come into contact with the polishing disc and then are selectively removed by the locally high pressure applied at the polishing surface.

The shape of the cutting edge shown in FIGS. 13 to 17 is merely a notch of the cutting edge, a geometrical arrangement of burrs, which is produced depending on the particle size of the abrasive, the force of the disc for suppressing the spring, And other examples of modifications. The groove spacing is not regular, as shown in FIGS. 13, 14 and 17, but depends on the speed of the knife crossed during sharpening and its consistency and the irregularity of the abrasive coating. After the sharpening stage, it is not unusual to see long burrs on the cutting edge that expand along the cutting edge at the same distance as many microgrooves. With sufficient polishing, burrs are greatly removed, especially the ultra-sharp cutting edges, which retain the rest of the microgrooves aligned. FIG. 16 (A), which is an enlarged cross-sectional view, shows a burr-free cutting edge with a small microfacet created by a polishing disc below the major surface of the cutting edge.

In the honing sharpening stage, the guide surface of the knife is preferably tilted at an angle V which is a few degrees more than in the sharpening sharpening stage than vertical as in FIG. For example, if the tilt between the vertical and the sharpening sharpening stage is 20 degrees, the angle V at the honing sharpening stage will typically be about 22.5 degrees. The range of this angle depends on the choice of sharpening stage in the range of 17-27 degrees.

The polishing surface of the honing sharpening stage having a disk cut into a truncated cone forms an angle C in the range of 2 to 10 degrees shown in FIG. 10 as in the sharpening sharpening stage. However, for example, if the frusto-cone of the sharpening sharpening stage makes an angle of 2 degrees, it is rather the surface of the honing sharpening disc that makes a larger angle of about 7 degrees than the surface of the normal honing sharpening disc. Good for driving.

For the same reason, it is better to incline the knife edge at an angle K of about 3 degrees in the honing sharpening stage as in the sharpening sharpening stage.

However, the horizontal axis of each knife guide surface in the honing sharpening stage is approximately equal to the angle C, which is the angle with respect to the surface of the truncated circular cone disk, with respect to the axis of the truncated circular disk during normal operation.
It will tilt at an H of 0. As a result, the horizontal axis of each guide surface will be tilted, for example, by about 7 degrees. All that event would cause the angle H to be 2-10 degrees.

The relationship of these angles is similar to the contact point of the sharpening sharpening disc, and similarly to the contact point of the sharpening sharpening disc, a ¼ circle of the disc on the front of the upper surface is attached to the polishing surface whose knife end is conical (the quadrant on the upper right surface is shown in FIG. (Shown in Fig.) Is guaranteed.

The angle of the cutting surface of the blade in the sharpening sharpening stage is made slightly larger than the vertical angle to the angle V established by the knife guide surface. For example, if the angle of the knife guide with respect to the vertical is 20 degrees, if the angle C of the conical surface is 2 degrees and the knife guide is tilted 2 degrees with respect to the horizontal, then the angle H is
It makes an angle of 20 to 22 degrees with the cutting surface, the exact angle of which depends in particular on the position of the contact point of the knife end of the disk surface.

Similarly, in the honing sharpening stage, the above point is defined at a position of 22.5 degrees with respect to the vertical direction of the knife guide surface and an angle of 7 degrees on the conical surface, and the knife guide has an angle of 7 degrees in the vertical direction. The new small cutting face at the edge set will be between 22.5 and 29.5 degrees.

However, because of the softness of the disc, it is possible to obey the deflection of the disc and the established shaping of the cutting edge of the main part in the sharpening sharpening stage, the new small cutting edge of which becomes less defined. In this case it would be above 20 degrees in any case.

Referring to FIG. 15, after the sharpening sharpening stage, the burrs (11) remaining along the edge are bent to the outside of the central axis of the blade, and become a sharpening sharpening disk coated with abrasives. It has a bent structure that is bent away from the bottom of the blades it encounters.
(See FIG. 15) In FIG. 15, the burr (11) is bent to the right and coated with the final abrasive sharpening sharpening disc surface to reduce the left cutting edge surface of the edge structure shown in FIG. It indicates that At this time, the blade is located on the honing sharpening stage, and the burr on the left end encounters the honing sharpening disc with abrasives, passes through several discs, and reduces it on the way it passed, so that this disc has a wide range of burrs. Will begin to get rid of.

On the honing sharpening groove that passes alternately,
Another honing sharpening disc has another surface (shown on the left of FIG. 15) of the cutting surface on which the fine cutting surface is formed, which is slightly slightly larger than the original cutting surface formed by the above sharpening sharpening stage. Abrasion at an angle with a large blade. Because there is no burr on the left side of the blade in FIG. 15, there is a burr,
Therefore a new fine cutting surface will be formed by the honing sharpening disc on the left edge sooner than on the right side where more metal has to be removed.

However, in the honing and sharpening stage, the blade will be repeatedly passed through each groove, and fine cutting edge surfaces will theoretically be formed symmetrically along the cutting edges on both sides. As the honing continues, the fine cutting edge surface
First, it is formed at the back portion (of the blade) of the fine groove portion, and then the cutting edge surface is formed along the valley portion of the fine groove portion. At this point, most of the saw teeth on any edge have been removed.

FIG. 16C is a perspective view seen along the cutting edge after the honing is repeatedly performed to form a sufficiently fine cutting edge surface along the edge.

The intersecting line of the groove portions on the first cutting edge surface and the fine cutting edge surface has a vertical groove structure along the cutting edge surface. The flutes have a clear boundary that intersects the fine cutting surface,
If the flutes are to crush or distort food or material to 5-20 μm or to cut it, participate in the cutting to contact their boundaries prior to cutting. This novel fine cutting surface has an effect on sharpness and "cutting edge" cutting ability and the obvious "bite" of the blade.

The method used in the present invention precisely controls geometric polishing and allows non-experts to mold burrs to consistently produce consistently high quality sharp edges. It makes it possible. This control is achieved through the physical characteristics of the stage and the honing sharpening disc by means of geometrically precisely shaped edges or a special configuration created in the sharpening sharpening stage.

The flexible abrasive mounted discs shown in FIGS. 11 and 12 are thicker than a truncated cone that rolls down the surface past the knife edge.

The polishing surface, such as the sharpening sharpening stage, is preferably moved toward and away from the cutting edge, rather than into the cutting edge. The knife blade (4) is set between the knife guide (2) and the lowering retention spring (1), the cutting edge of which is first brought into contact with the conical sharpening sharpening disc and up to the cutting edge of the knife. A groove (37) is formed in the guide (33). See Figures 8-9.

The operation method in stage 1 is as follows.
The knife is firmly clamped against the ± 0.5 degree angle of the honing sharpening disc, successfully leading the disc across the left and right polishing edges.

The mechanical and abrasive properties of the honing sharpening disk are derived from the epoxy, which is the matrix of the composition, and the composition and particle size of the solid.

The composition of the epoxy composed of two substances is given to the ratio of the monomer given to the curing material, the temperature given at the time of curing (typically 120 ° C.) and the time (typically 4 hours). Characterized by the required flexibility.

The solids content (74 wt% aluminum oxide standard with a standard particle size of 5 μm) and the physical properties of the hardener and the adaptability of the epoxy composition will determine the polishing rate and the final edge quality.

It is important to the precisely controlled flexibility of the conical honing sharpening disc, that it is geometrically stationary and sufficient to create the configuration of the cutting surface and the soft saw blade edge. Sufficient stiffness is premade by stage 1 to remain flexible.

As shown in FIGS. 16A and 17, this coincidence ensures that the root of the burr is polished to remove the burr by the gentle action of the abrasive. The honing process also sharpens the upper edge of the saw blade along the edge.

Honing Disc Construction and Properties The honing disc (15) is essential to the successful creation of ultra-sharp edges with higher and unique physical properties as described therein. This disc should only be polished so that it is not too strong, avoiding excessive polishing and breaking of the fine grooves created by sharp edges and sharp sharpening sharpening stages.

The disc is sufficiently polished at a reasonable speed to remove any burrs previously formed by the sharpening stage, for example, the portion that requires honing is preferably finished by pulling the honing disc left and right only a few times. In addition, the disks are assembled so that they will not deposit too much on their surface with high purity metal debris away from the chip-abrasive knife.

It is also important that the physical properties are adequately maintained so that the disc does not overheat, as it does not become too soft by the sharpening heat. It is desirable to retain their physical properties for many years by preventing them from being contaminated and oxidized by organics or from continuing to interact and exceed their reasonable lifetime and overpolymerize. If the honing discs become stiffer, they will damage the cutting edge.

The grit size must be carefully selected. The grid size is about 25 microns (μ
m) has already been shown as well as aggressively scratching the edges. As a result, successful honing of the invention as described herein may include organic matter selection of the adherent, abrasive material, abrasive size, ratio of abrasive to incorporated organic matter, disk size, speed and speed and sharpening. Careful selection of the pressure opposite the edge of the knife inside is required.

Suitable physical properties of the disk required for successful honing are flexibility, elasticity, hardness, proper abrasivity, which is sufficient to remove metal, thermal properties (heat generation). However, the rate of metal removal not too high is to not aged its properties a little.

Attempts with a convenient sharpening rod represent an improvement in the formation of edges that have been proven unsuccessful by Stage 1. The fabric wheel and the fiber wheel on the edges in this operation tend to be extremely non-uniform. These must be manually coated to provide frequently adhered abrasives and are impractical to implement as a commercial sharpener.

This construction has shown that the cloth and fiber wheels produce non-uniform structures and non-uniform abrasive movements, which are totally unpredictable and that they are regularly formed with sharp edges that are preferably formed. It has the major drawback of being inconsistent due to its destruction. Wheels made of leather products and breathable polyurethane materials (such as corfram) are not practical because their shavings "stick". The workmanship here is also unpredictable and inconsistently torn and unsatisfactory as a commercial sharpener.

A major advantage of the optimum configuration for the honing disk described herein is that it is uniform and fiber-free, and therefore the composition and physical properties are very uniform throughout the disk. They are predictable by allowing precise honing angles at precise and consistent optimal angles with sharpening sharpening stages and predictable angles due to the relationship to the cutting surface,
It provides consistent, smooth, and uninterrupted operation.

The magnitude of the pressure and the effect of the honing disc's polishing action must provide consistently well-formed fine cutting edges and ultra-sharp edges that are placed on the same day and removed on the same day. It has a construction that is extremely free of scraping and damaging edges, or the risk of excess and failure to scrape a surface quickly.

In the sharpening and sharpening stage for removing burrs by forming a small minute surface along the cutting edge, the physical characteristics of the disk must be lowered within a narrow range in order to ensure optimum conditions. A wide variety of organic materials were each evaluated by weight for abrasive particle size and content range. Rubber-based wheels are impractical in that they quickly and completely fill when a small amount of abrasive is added and also wear quickly. When a large amount of abrasive is used, it damages the cutting edge or wears the cutting edge faster. Focusing on polyurethane because it is robust,
It is too stiff and cannot be removed enough to expose a new polishing surface.

A wide variety of epoxy resins have been extensively evaluated for different abrasives of different particle sizes. The only class of epoxies proved to be sufficient. The vast majority of ordinary epoxies that are normally useful have been found to be impractical. Because they are all extremely brittle, extremely easy to bury, their debris are sharp, the surface is glossy, their properties tend to change over time, they become extremely soft due to the heat during polishing, and they also have elasticity. This is because the flexibility is insufficient.

The optimal epoxy compound was obtained from Masterbond. It is composed mostly of polyoxypropylene amines, which consist of primary, secondary and tertiary aliphatic polyethers derived from propylene oxide with diols and triols added. . In this, the above chemical substance is made by mixing two systems. This substance is a product formed by putting a proper amount of an abrasive in a forming mold and having essentially no deformation and small shrinkage.

A special formulation, 37-3EC, is specifically formulated for the present invention. This gives you the flexibility, durability and hardness you need, and more importantly,
This formulation avoids embedding when a proper amount of abrasive is blended, ablate fast enough to keep the abrasive surface exposed and fresh, and reduce disk life It should not ablate as quickly.

The type of abrasive was tested. It has been determined that carborundum is less effective than metal-free aluminum oxide (alumina). Although effective, diamond is expensive. The optimum particle size is in the range of 5-12 microns (μm) for aluminum oxide. A sufficient weight ratio of alumina to epoxy is 1 part by weight epoxy to 1 to 4 parts by weight alumina. If the concentration of the abrasive is low, polishing will be slow and not practical. If the adhesive strength of the epoxy is high, cracks may occur during use, resulting in improper results.
Aluminum oxide and diamond are the preferred abrasives.

As the optimum construction of the epoxy resin having the abrasive embedded therein, the optimum disk thickness is about 0.08 inch to 0.1 at the edge portion of the disk having a diameter of 2 inches.
The range was 25 inches. This thickness provides good flexibility and conformability while maintaining the essential abrasiveness, strength, and durability, and provides rubber-like properties that maintain its shape over long-term use. . The disc becomes slightly softer as it warms up with use, but this does not interfere with the effectiveness of the disc.

The optimum curing rate of the epoxy resin in which the abrasive is embedded is common sense and practical. The mixed abrasive and epoxy resin reach final properties at 212 ° F for 1-2 hours. However, when cured at 220-230 ° F for 4 hours, it shows the same characteristics for the next 3 years. This proves to be impractical for the present invention, for example, mixtures of other epoxy resins that slowly cure over a period of several days or more, whose properties will continue to change for more years.

The physical properties of this optimum mixture of abrasive and epoxy are difficult to measure with standard processing. This is because it has a unique combination of hardness, compressibility and elasticity, but it can be characterized with a commonly used Wilson Rockwell hardness tester. The method of measuring the properties of this unique material is as follows.

As the test means, a standard Wilson Rockwell hardness tester is used. This hardness tester has 7/8
An inch diameter steel ball is provided with a 2x2 inch and 3/8 inch thick sample of this material compressed under the ball. Then, first compress with a reference weight of 10 kilograms and then with a test weight of 60 kilograms. The ball is sunk from the top to the bottom of the sample by the initial weighting, resulting in the ball's first remaining height of 0 points. A test load is then applied to the ball and the distance (converted to height) that the ball sunk below 0 points is D1. The test weight changes while the test weight remains and while the amount of subduction is restored. The amount of subduction below that first 0 point is recorded as D2. In this procedure, a sample of the material of the invention is compressed to 229 graduations (0.0183 inches) on a Rockwell hardness tester within 30 seconds when a standard load is applied. This is D1. The amount of subsidence D2 when the test load changes is 14
The scale is 0 (0.0112 inch). Recovery R is (D1-D2) /D1=0.39 or 3
9%. When all weights are removed, this material
Recovers to over 98% of the original thickness within 0 minutes. The mixture with the lighter abrasive embedded recovered more quickly to the original thickness after this test. The recovery R defined above and the subsequent recovery of the disk to its original shape are very important properties for optimum performance of these disks.

A typical sample of a satisfactory mixture for an abrasive-embedded disk was tested as shown below. Sample # Epoxy 37-3EC R D2% Solid% Recovery in Residual Subsidence (at 10 Kg) Scale 1 78% 31 155 2 74% 39 140 3 50% 75 1 Scale corresponds to subduction 0.00008 inches These are properties in a relatively narrow range and give satisfactory performance when using 5 μm grit. The optimal mixture is a narrower range of 65-75% with 5 μm grit. This is an indication of the criticality and physical properties of the mixture.

Typical values have been stated herein as producing satisfactory sharpness and the sharpness required by professional cook lengths.

A satisfactory cutting edge is about 40% to 80% by weight
Produced by a honing disk made by adding abrasive particles with a size in the range of 1-20 μm with a mixture of epoxies. Within these ranges, it is preferable to use small particles in the upper limit of the range for embedding the abrasive.

When the solid content of the abrasive exceeds the upper limit,
The edge of the honing sharpening disc is too hard, so the cutting edge is less sharp than desired, while in the case of a disc softer than the lower limit, the time required to obtain a satisfactory cutting edge increases, and the disc wears during use. It tends to be glossy and shiny.

This range of solids and fineness of honing discs can be used to cover a variety of applications from heavy honing mill tools to sharp craft knives. It has been found that the exemplary range shown in this application produces a surprisingly sharp knife edge, which, due to its precise edge geometry, will leave the edge sharper for longer periods of use. Other conventional methods either leave a brittle edge along the cutting edge or create a blunt cutting edge. The unique design that combines the sharpening and honing stages creates a uniquely sharp and long-lasting cutting edge.

Others Another object of the present invention is to make the sharpening section 24 (including the sharpening sharpening stage and the honing sharpening stage) of the present apparatus easily and quickly removable for maintenance, thereby making it possible to clean a kitchen for business use. It is to provide a unique multi-stage sharpening device that can meet the conditions. FIG. 1 shows how this is achieved. Sharpening part 2
4 is the release button 2 as shown in the silhouette
6 (FIGS. 3 and 6) to slide the sharpening section 24 away from the motor drive section 25,
Can be separated from 5. An automatically coupling / uncoupling joint 23 of suitable construction can be used, partly attached to the motor drive 25 and partly attached to the sharpening part 24, for example by spline rubber connecting sleeves. . A flexible spline joint of this kind compensates for a misalignment of about 1/16 inch between the sharpening portion 24 and the motor driving portion 25. As shown in FIG. 5, a flexible joint 23,
The motor drive shaft and the spline 22 attached to both the shaft of the sharpening portion 24 are slidably coupled and disengaged. As shown in FIG. 6, the release button 26 is spring-biased and is engaged / disengaged by the pawl 21. Since both the sharpening and honing sharpening discs and the knife blade guide are mounted on a common rigid support structure within the entire sharpening section 24, the relationship between the two is for regular maintenance of the sharpening section. It is not disturbed even if it is removed and then returned to the original position of the motor drive.

Although the present invention has been described above with particular reference to one sharpening and one honing sharp, the present invention is, of course, practiced with more than one sharpening and / or honing sharp. It is possible. For example, FIG. 22 shows a sharpening device having two sharpening sharpening parts 7 and one honing sharpening part 8. When using two or more sharpening parts, the angle from one sharpening part to another sharpening part must be gradually increased.

The above-described embodiment is described for facilitating the understanding of the present invention and is not described for limiting the present invention. Each element disclosed in the embodiment is intended to include all design changes and equivalents within the technical scope of the present invention.

[0077]

As described above, according to the present invention, it is possible to form a precise and durable cutting edge which is superior to a sharp razor over a wide range of the blade. Moreover, sharpening work can be performed quickly and easily.

[Brief description of drawings]

FIG. 1 is a side view of a sharpening device according to the present invention, showing a portion for sharpening and honing a blade in both attached and detached states.

2 is a plan view of the sharpening device of FIG. 1. FIG.

3 is an end elevational view of the sharpening device of FIGS. 1 and 2. FIG.

FIG. 4 is a sectional view taken along line 4-4 in FIG. 1;

5 is a cross-sectional view taken along line 5-5 of FIG.

FIG. 6 is a sectional view taken along line 6-6 in FIG. 2;

FIG. 7 is a graph showing the relationship between spring length and force on a disc.

FIG. 8 is a side view showing a state where a large knife is sharpened at the sharpening portion of the apparatus of FIGS.

FIG. 9 is a view similar to FIG. 8 showing the state where the small knife is sharpened.

10 is a sectional view taken along the line 10-10 of FIG.

11 is a sectional view similar to FIG. 8, showing a large knife in the honing part of the device of the present invention.

FIG. 12 is an enlarged cross-sectional view of a honing portion showing a state where burrs are removed from a knife.

FIG. 13 is an enlarged side view showing a cutting edge surface of a blade as a result of utilizing a sharpened portion of the device of the present invention.

FIG. 14 is an end elevational view of the blade of FIG.

15 is a sectional view taken along line 15-15 of FIG.

16A is a sectional view taken along line 16-16 of FIG. 17, FIG. 16B is an end elevational view showing a honing-finished blade according to the present invention device, and FIG. It is a fracture | rupture perspective view which shows the cutting edge of the blade by which such honing finishing was carried out.

FIG. 17 is an end elevational view showing the cutting edge deburred and re-polished from the knife after it has been honed in the honing portion of the device of the present invention.

FIG. 18 is a left end side elevational view of a sharpening disc used in the device of the present invention.

19 is a cross-sectional view taken along the line 19-19 of FIG.

FIG. 20 is a left end side elevational view of a honing disc used in the device of the present invention, also showing the operation path of the knife.

21 is a cross-sectional view taken along the line 21-21 of FIG.

FIG. 22 is a side view of a modified example of the device according to the present invention, showing a plurality of sharpening parts.

[Explanation of symbols]

 1 ... Spring (spring member), 2 ... Guide surface, 4 ... Blade, 5, 15 ... Disk, 6 ... Spring (spring means), 7 ... Sharpening sharpening stage, 8 ... Honing sharpening stage, 9 ... Shaft (axis) , 33 ... Blade guide, 36 ... Sharpening device, 37 ... Groove.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Robert P. Bigeano, Delaware, USA 19810, Wilmington, Narman's Road 3120

Claims (46)

[Claims] 1. A blade sharpening device having a distracted cutting edge and a cutting surface that hangs on each side of the cutting edge, comprising at least one disk having an exposed abrasive coating surface, The disk, when the blade moves to contact the surface,
In order to move the abrasive coating surface toward and away from the cutting edge, it is provided on a shaft that rotates around a horizontal axis, the blade guide surface is juxtaposed to the disk, and the blade guide surface is the disk. Having a predetermined vertical angle with respect to a vertical line orthogonal to the rotation axis of, the blade guide surface, the blade abutting against the guide surface to put the blade in contact with the abrasive coating surface In order to function as an inclined guide of the blade when positioned, it is in a plane that intersects with the abrasive coating surface, a blade guide is provided on the disk, and the blade guide moves the blade to move the abrasive coating surface. There is provided a portion that comes into contact with the blade when it comes into contact with the blade, the contact portion is in front of the abrasive coating surface, and the blade guide guides the blade to the abrasive coating. Of the cutting edge guide to cooperate with the tilt guide to provide a guide track to the cutting edge of the blade as the blade moves across the rotating abrasive coating surface for placement in a regular position to abut the surface. A sharpening device having an exposed surface for use at the contact point, which is formed of an abrasion resistant material capable of forming a blade tip of a blade provided across and a groove for receiving both cutting blade surfaces. 2. The sharpening device according to claim 1, wherein the two disks are juxtaposed and rotationally driven by a motor drive assembly, and the abrasive coating surface of each of the disks has a truncated cone shape. 3. The blade guide surface is 0.5 to 0. .0 from the shaft so that the blade contacts the abrasive coating surface.
The sharpening device of claim 2, wherein the motor drive assembly is arranged at radial distances in the range of 9 inches and is capable of imparting a linear velocity to the abrasive coating surface of approximately 450 to 700 feet per minute. 4. The cutting edge guides are provided on both of the side-by-side discs, and contact points are provided by the same cutting edge guide so that the blades contact any of the discs. The sharpening device described. 5. The sharpening device according to claim 1, further comprising a rear cutting edge guide disposed apart from the cutting edge guide to provide a contact surface behind the abrasive coating surface. 6. The sharpening device according to claim 1, wherein the cutting edge guide is made of a material having a toughness and a low friction coefficient. 7. The sharpening device according to claim 6, wherein the cutting edge guide is made of a polypropylene material. 8. The sharpening device according to claim 6, wherein the cutting edge guide is made of a polyethylene material. 9. The tilt guide and the cutting edge guide are
To ensure sharpening sharpening of the blade proximate to the blade handle, cooperate to position the cutting edge in contact with the disc in the upper front quadrant near the front end of the disc. The sharpening device according to claim 1, wherein 10. The sharpening device according to claim 1, wherein the abrasive on the abrasive-coated surface has a grit size in the range of approximately 100 to 600. 11. Two of the disks are provided on the shaft, the shafts are separated from each other by a spring means that urges the disks to move away from each other, and the spring member extends along the shaft. The sharpening device of claim 1 wherein a force in the range of 0.6 to 1.4 pounds is applied for each 0.1 to 0.15 inch movement of the disk. 12. The disc is a hard disc in a sharpening sharpening part of a sharpening device, the sharpening device further has a honing sharpening part, and the honing sharpening part is provided with at least a shaft rotating about a horizontal axis. One soft disk is provided, the soft disk has an exposed abrasive coating surface, and the blade guide surface of the honing sharpening portion has a predetermined vertical angle with respect to a vertical line orthogonal to the rotation axis of the disk. 12. A second cutting edge guide is provided on the soft disk of the honing sharpening portion, and one of the double cutting edge guides is provided for each of the sharpening sharpening portion and the honing sharpening portion. Sharpening device. 13. The sharpening sharpening section is provided with a set of two hard disks arranged side by side, and the honing sharpening section is provided with a set of two soft disks arranged side by side, wherein the sharpening sharpening section is provided. And at least one of the honing sharpening portions is provided with an inverted U-shaped spring member, and the spring member has a cantilevered elastic arm and a connecting portion in the middle thereof, and the connecting portion is above the assembled disc. 13. The sharpening device according to claim 12, wherein the arm of each of the spring members extends downward so as to substantially follow a part of each of the disks. 14. The sharpening device according to claim 13, wherein the spring member is provided above the disks of each set for each of the sharpening sharpening portion and the honing sharpening portion. 15. A blade sharpening device having a distracted blade edge and a cutting edge surface that hangs on each side of the blade edge, comprising at least one frustoconical disk having an abrasive coating surface. However, the disk, when the blade moves to contact the surface,
In order to move the abrasive coating surface toward and away from the cutting edge, it is provided on a shaft that rotates around a horizontal axis, the blade guide surface is juxtaposed to the disk, and the blade guide surface is the disk. Of the vertical axis perpendicular to the axis of rotation of the predetermined vertical, the disk has a dynamic region for contact with the blade, the disk, when contacting the jagged edges of the blade The disk is soft in the dynamic region to allow the disk to flex and bend under repeated loading and flex at the contact point, and the abrasive coated surface is an epoxy-based material containing an abrasive. A sharpening device made of resin. 16. The soft disk is provided in a honing sharpening section of the sharpening device, the sharpening device further having a sharpening sharpening part, the sharpening sharpening part having at least one hard surface having an abrasive coating surface. A hard disc, the hard disc facing the abrasive coating surface toward and away from the cutting edge when the blade is moved to contact the abrasive coating surface that creates microgrooves along the cutting edge. A soft disk of the honing sharpening portion, provided on a shaft which rotates about a horizontal axis for displacing and moving, comprises microgrooves along the cutting edge and means for correcting the resulting indentations.
The sharpening device according to item 5. 17. The sharpening device according to claim 15, wherein the two discs are arranged side by side and are rotationally driven by a motor drive assembly, and the abrasive coating surface of each of the discs has a truncated cone shape. 18. The blade guide surface is 0.5 from the axis so that the contact point of the blade comes to the abrasive coating surface.
18. A sharpening device according to claim 17, disposed at radial distances in the range of .about.0.9 inches, the motor drive assembly being capable of imparting a linear velocity of approximately 450 to 700 feet per minute to the abrasive coating surface. . 19. The sharpening device of claim 15 wherein said disc has a thickness on its outer periphery in the range of approximately 0.08 to 0.125 inches. 20. The sharpening device according to claim 15, wherein the epoxy resin is based on polyoxypropylene amine. 21. The soft disc is 30-60% as measured on a Wilson Rockwell hardness tester using a steel ball 7/8 inch diameter with a reference load of 10 kilograms and a test load of 60 kilograms. 2. A material which recovers within the range to leave a hollow of 50 to 155 scale.
The sharpening device according to item 5. 22. The abrasive-coated surface is made of a soft polymer material that is sufficiently worn during use and has a weight ratio of 50-7.
A method comprising 0% of abrasive particles, wherein the abrasive particles are exposed and remain on the cutting edge, and the abrasive coating surface is prevented from being covered with a metal powder that is removed during sharpening. The sharpening device according to item 15. 23. The abrasive coated surface contains abrasive grains in an epoxy resin in a range of 50 to 70% by weight, and the epoxy resin comprises a polypropylene oxide adduct of diol and triol. 16. The sharpening device according to claim 15, which is derived from aliphatic polyether primary, secondary and tertiary amines. 24. The sharpening device of claim 15 wherein said abrasive coated surface comprises abrasive particles sized 1-25 microns embedded in a soft polymeric material. 25. A cutting edge guide is disposed on the disk, and the cutting edge guide provides a contact point with the blade when the blade moves and comes into contact with the abrasive coating surface, and the contact point is the abrasive coating. In front of the surface, the cutting edge guide being provided transversely within the cutting edge guide to provide a guide track for the cutting edge as the blade crosses the rotating abrasive coating surface. The sharpening device according to claim 15, further comprising an exposed surface used for the contact portion, which is made of an abrasion resistant material capable of forming a groove for receiving the surface. 26. The soft disc is located in a honing sharpening section of the sharpening device, the sharpening device comprising a sharpening sharpening part, a hard disc mounted on the sharpening sharpening part and having an abrasive coating surface, A sharpening sharpening portion and a blade guide surface that is on a plane that intersects with the abrasive coating surface of the hard disk, the blade guide surface contacting a blade with the abrasive coating surface of the hard disk. 26. A sharpening device according to claim 25, which acts as a guide for the blade when the blade is placed in contact with the blade guide surface for placement. 27. The sharpening sharpening section has a set of two hard disks lined up, and the honing sharpening section has a set of two soft disks lined up to form the sharpening sharpening section and At least one of the honing sharpening parts has an inverted U-shaped spring member, which is composed of a cantilever elastic arm and a connecting part in the middle thereof, and the connecting part is provided above the assembly disc. ,
The arm of each of the spring members extends downward generally along a portion of each of the disks.
The sharpening device according to item 6. 28. The sharpening device according to claim 27, wherein each of the sharpening sharpening portion and the honing sharpening portion is provided with one of the spring members. 29. A blade sharpening device having a distracted cutting edge, the sharpening device comprising an upright sharpening assembly having polishing surfaces on both sides thereof, and a blade juxtaposed to each of the polishing surfaces along the polishing surface. With a distracting blade guide surface for guiding and contacting, the improvement is in a spring assembly, the spring assembly having a distracting inverted U-shaped spring member, the spring member having a downwardly extending cantilever. Elastic arm connected to an upper intermediate connection, which connection is directly above the sharpening assembly, the arms extending generally along a portion of the sharpening assembly on opposite sides of the sharpening assembly. Extending downwardly, the arms each extend downwardly between one of the blade guide surfaces and the sharpening assembly to provide a sharpening force between the arm and the blade guide surface juxtaposed to the blade guide surface. Forming an elastic diagonal slot towards the polishing surface, each arm contacting the arm and the blade guide surface as the blade moves within the slot to contact the polishing surface To ensure that the sharpening device has a length and shape sufficient to be sufficiently close to the blade guide surface when the blade is not in the slot. 30. The arm extends substantially the entire length of the guide surface, and the arm is in contact with the blade guide surface when the blade is not in the slot.
The sharpening device according to item 9. 31. A guard member extending downwardly from the connection substantially perpendicular to the arm to limit access to the sharpening assembly when not in use.
The sharpening device according to item 9. 32. Mounting means for providing said spring member, said mounting means laterally moving or angularly pivoting about said mounting means for accommodating the contour of the blade being sharpened. 30. The sharpening device according to claim 29, which permits to do. 33. A support structure, a motor drive assembly,
And a blade sharpening device having a sharpening module attached to the support structure, the sharpening module having a plurality of abrasive coating disks, the disks for rotating about a shaft assembly within the module. Mounted on the axis of the assembly, the motor drive assembly is external to the module, the motor drive assembly having an axially rotatable rotary shaft driven by a motor, The motor driven rotary shaft is releasably connected to the shaft assembly by a coupling unit for selectively rotating the disc, the joint unit selecting the motor driven rotary shaft for the shaft assembly by a manually operated actuating member. To connect And the manually operated actuating member has a first position that physically restricts relative movement between the motor drive assembly and the module to prevent the module from leaving the motor drive assembly. And the manually operated actuating member provides free separation of the module from the motor drive assembly for disconnecting the module from the motor drive assembly so that the module can be independently serviced separately from the motor drive assembly. The sharpening device having a second position that allows for free removal of the module from the motor drive assembly to allow removal of the module from the support structure. 34. The sharpening device according to claim 33, wherein the joint unit is a spline joint. 35. A sharpening device according to claim 34, wherein the manually operated actuating member is a spring-biased pawl. 36. The sharpening module has a sharpening sharpening portion and a honing sharpening portion, the sharpening sharpening portion having a pair of abrasive coating disks, and the honing sharpening portion having a pair of abrasive coating disks. The sharpening device according to claim 33, further comprising: 37. The sharpening device according to claim 36, wherein the disc of the sharpening sharpening portion is a hard disc, and the disc of the honing sharpening portion is a soft disc. 38. Each of the sharpening sharpening portion and the honing sharpening portion is provided with a blade guide surface disposed at a predetermined vertical angle with respect to a vertical line perpendicular to a rotation axis of the disc. At least one of the sharpening sharpening portion and the honing sharpening portion is provided with a cutting edge guide having a contact point in front of the disk, and the cutting edge guide is a blade when the blade crosses the abrasive coating disk. 38. A sharpening device according to claim 37, having a blade contact surface made of an abrasion resistant material in which a groove for receiving the cutting edge of the blade is formed to provide the guide track of the above. 39. The sharpening device according to claim 38, wherein each of the sharpening sharpening portion and the honing sharpening portion is provided with the cutting edge guide on the disc. 40. An inverted U-shaped extended spring member is provided on at least one of the sharpening sharpening portion and the honing sharpening portion, and the spring member has a cantilevered elastic arm extending downward. Connected to a connecting portion of the disk, the connecting portion being disposed directly above the disc, the arms each extending downward substantially along a portion of each of the discs, the arms each extending from the arm 39. A sharpening device according to claim 38, wherein said sharpening device extends downwardly between said blade guide surface and a disk adjacent thereto to form a resilient diagonal slot with said blade guide surface. 41. The sharpening device according to claim 40, wherein each of the sharpening sharpening portion and the honing sharpening portion is provided with the spring member. 42. The sharpening device according to claim 41, wherein each of the sharpening sharpening portion and the honing sharpening portion is provided with the cutting edge guide. 43. The module has a sharpening sharpening portion and a honing sharpening portion, each of the sharpening sharpening portion and the honing sharpening portion having a pair of abrasive coating discs, wherein the sharpening sharpening portion is 34. The sharpening device according to claim 33, wherein the disc is hard and the disc of the honing sharpening portion is soft. 44. Each of the discs of the sharpening sharpening portion and the honing sharpening portion is provided with a blade guide surface arranged at a predetermined vertical angle with respect to a vertical line perpendicular to a rotation axis of the disc. The disc of at least one of the sharpening sharpening portion and the honing sharpening portion is provided with a cutting edge guide having a contact point in front of the disc, and the cutting edge guide is a blade when the blade crosses the abrasive coating disk. 44. A sharpening device according to claim 43, having a blade contact surface made of an abrasion resistant material in which a groove for receiving the blade edge of the blade is formed so as to provide the guide track. 45. An inverted U-shaped extended spring member is provided on at least one of the sharpening sharpening portion and the honing sharpening portion, and the spring member has a cantilever elastic arm extending downward. Connected to a connecting part of the disk, the connecting part being located directly above the disc, the arms each extending downward substantially along a part of the disc, and each of the arms includes the arm and the blade guide. 45. A sharpening device according to claim 44, wherein said sharpening device extends downwardly between said blade guide surface and an adjacent disk to form an elastic diagonal slot with the surface. 46. The sharpening device according to claim 45, wherein each of the sharpening sharpening portion and the honing sharpening portion is provided with the spring member.