JPH09239647A - Edge finishing device of long sized cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an edge finishing device which can satisfy both the finish surface roughness of the respective edge finish surfaces, and the grinding time, when one step or plural steps of edge finish surfaces are formed on the edge front side or the rear side of various sorts of long size cutters. SOLUTION: To the grinding wheel spindles 36 and 37 of a grinding wheel device 21 for edge upper surface finishing and/or a grinding wheel device 22 for edge lower surface finishing, which are moved up and down, and forward and backward, and rotated, by a grinding wheel position regulating means 12, at least two finish grinding wheels are held concentrically, and vertically separated in a specific size. The two finish grinding wheels held separating up and down in such a way are made in grinding wheels with different grain sizes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding device for various long blades such as veneer rotary knives and slicer knives, and in particular finishes the front and back surfaces of the long blade with a predetermined angle and width. The present invention relates to a blade edge finishing device for long blades.

[0002]

2. Description of the Related Art Conventionally, a veneer rotary race for continuously cutting a veneer having a predetermined thickness by automatically feeding a blade while rotating a log fixed to a main shaft, and a blade and a material to be cut are relatively Long-sized veneer rotary knives and slicer knives are used in veneer slicers that reciprocate to cut a single plate having a predetermined thickness.

[0003] In recent years, due to lack of wood, multi-hard hard coniferous wood and the like have come to be frequently used, and the conventional single-angled blade edge is hand-finished with a hand sharpening grindstone so that it is pressed or bited. Frequently occurs, resulting in uneven thickness of the cut veneer and unevenness on the surface, resulting in poor quality veneer with poor smoothness, and due to hard parts such as knots The tip or edge of the blade will occur at an early stage,
As a result, there has been a problem that the downtime for mid-grinding or blade change is increased and work efficiency is deteriorated.

In order to solve this problem, a multi-stage sharpening blade die has been used in which a single-step or multi-step cutting surface is formed on the front surface and the back surface of the cutting edge at a predetermined angle and width, respectively. Finishing equipment has been developed. As this conventional blade finishing device, the actual cutting blade 62-
There are known cutting edge finishing devices described in JP-A-46543, JP-A-3-55151 and JP-A-7-100471.

The blade finishing device described in Japanese Utility Model Laid-Open No. 62-46543 is a grindstone capable of vertically moving, moving back and forth, and turning the blade front surface and the blade back surface of a long blade mounted and fixed on a chuck. The upper and lower surfaces of the grindstone held by the apparatus are used for finish grinding. With this cutting edge finishing device, it is possible to finish grinding the front and back surfaces of the cutting edge with one device without the need for manual manual sharpening, which makes it possible to make the cutting edge finished surface uniform over the entire length of the cutting tool. it can.

Further, the above-mentioned Japanese Patent Laid-Open No. 3-55151,
The technique disclosed in Japanese Patent Laid-Open No. 7-100741 relates to a blade edge position detecting method and a detecting device in a long blade grinder, but each publication discloses a plurality of electromagnetic chucks on a long bed. The long blade that is fixed with the blade surface as the upper surface via the main blade surface grinding wheel after the main blade surface is ground, the blade edge surface and the blade edge back surface can be vertically moved, back and forth movement, and the angle of the ground surface can be changed. Examples of a long blade grinder that performs finish grinding by a blade surface super-finishing grindstone device and a blade back super-finishing grindstone device provided in. According to this long blade grinder, even when there is a fine distortion in the blade edge of the long blade, both the front surface of the blade and the back surface of the blade are ground and removed from a higher portion, so that the straightness of the blade can be obtained. It is possible to obtain a long blade which is extremely effective for cutting.

[0007]

On the other hand, a blade edge ground by a main-grinding surface grinding wheel at a predetermined angle generally uses a grinding wheel with a grain size of 36 to 46 as the main-grinding surface grinding wheel. Due to grinding, the front and back surfaces of the cutting edge are considerably rough. On the other hand, in the finishing of the cutting edge in which one surface or a plurality of surfaces of the cutting edge are formed with a predetermined angle and width on the cutting edge front surface and the cutting edge back surface, respectively, it is required that the surface roughness be as good as lapping. The particle size of 80
No. 0 to 3,000 whetstones (sometimes grain size 8,000 whetstones) are used. And, when the cutting edge finish surface is one step, it is judged from both the finish surface roughness and the grinding time to select a grindstone with an appropriate grain size and finish the grinding.
However, when the finishing surface has a plurality of stages, as shown in FIG. 5, the initial grinding width (X) is wide, and the grinding width (Y) of the most advanced finishing surface where the angle is large is narrow, but The finished surface is required to improve the surface roughness of the finished surface as much as possible.

[0008] However, in the above-mentioned conventional cutting edge finishing device, since only one finishing wheel is used for finishing grinding the cutting edge front surface and the cutting edge back surface, the same is true of the wide first finishing grinding and the narrow final finishing grinding. Grinding with a grindstone complicates the relative judgment of each finished surface roughness and grinding time. When importance is attached to the surface roughness of the finishing surface, a finishing grindstone with a finer grain size is selected. As a result, a large amount of time is consumed during the first finishing grinding with a wide grinding width, and the consumption of the grinding stone is also increased. In contrast,
On the other hand, when a finishing whetstone with a coarse grain size suitable for finishing the first wide finishing surface with emphasis on finishing time is selected, the finishing time will be shorter and the consumption of the grinding stone will be less, but the final finishing surface with a narrow width However, there was a problem that the finished surface was rough. Further, even if a finishing grindstone with an intermediate grain size is used, it has not been possible to satisfy both the finishing time and the surface roughness of the finished surface.

Further, in the above-mentioned conventional cutting-edge finishing device and long blade grinder, a grindstone device, or a blade surface super-finishing grindstone device or a blade back super-finishing grindstone device is made into a double type, and a blade surface and a blade back-finishing grindstone are provided. As an alternative, it is possible to provide two types of finishing grindstones with different grain sizes, but the number of control shafts for positioning the grindstone increases, which causes the problem that the entire device becomes complicated and expensive. come.

The present invention was conceived in view of the above problems of the prior art, and in the case of forming one or a plurality of steps of the cutting surface on the front surface or the back surface of the blade of various long blades, respectively. It is an object of the present invention to solve the above problems by simply and inexpensively providing a cutting edge finishing device capable of satisfying both the roughening of the finished surface and the grinding time.

[0011]

The present invention has the following means in order to solve the above technical problems. A first invention to obtain a patent is a chuck provided on a long bed so as to be able to be fixed at an arbitrary inclination angle, and a chuck for mounting and fixing a long blade on the upper surface thereof and a longitudinal direction of the long bed. On a pair of front and rear rails provided along the table, a table that is vertically opposed to the chuck and is reciprocally movable by a driving unit, and a grindstone position adjusting unit provided at a predetermined position of the table, The upper surface is a grinding surface, and a grindstone device holding a cutting edge lower surface finishing grindstone to which rotation is given by a driving means is moved up and down, moved back and forth, and swung, and the grinding surface of the cutting edge lower surface finishing grindstone is made the upper surface of the chuck. It comprises a grindstone position adjusting means for adjusting the position so as to contact the lower surface of the blade of the mounted long blade at a predetermined angle, and the lower surface of the blade of the long blade is longitudinally moved by the grinding wheel for finishing the lower surface of the blade. In a blade edge finishing device for grinding along a long blade, at least two blade edge lower surface finishing grindstones are concentrically held by a grindstone shaft of the grindstone device vertically with a predetermined distance therebetween, and an upper surface of the chuck. The grinding wheel device is rotated by the grinding wheel position adjusting means to an angle at which the grinding surface of the cutting edge lower surface finishing grindstone can come into contact with the lower surface of the blade edge of the long blade mounted at a predetermined angle at a predetermined angle, and, When the whetstone device is moved up and down and back and forth so that the blade edge of the long blade enters a predetermined amount between the whetstone bottom surface finishing whetstones that are vertically held on the whetstone shaft of the whetstone device. , A gap that can be relatively entered without collision between the upper and lower cutting edge lower surface finishing whetstones and the blade edge of the long blade is secured between the at least two cutting edge lower surface finishing whetstones. A cutting edge finishing apparatus long knives to.

A second invention to be patented is a chuck provided on a long bed so as to be fixed at an arbitrary inclination angle, and a chuck for mounting and fixing a long blade on the upper surface thereof, and the long bed. On a pair of front and rear rails provided along the longitudinal direction, a table that is vertically opposed to the chuck and is reciprocally movable by a driving means, and a grindstone position adjusting means provided at a predetermined position of the table. Then, the lower surface is a grinding surface, and a grinding stone device holding a cutting edge upper surface finishing grindstone to which rotation is given by a driving means is vertically moved, moved back and forth, and swung, and the grinding surface of the cutting edge upper surface finishing grindstone is used as the chuck. And a grindstone position adjusting means for adjusting the position of the long blade of the long blade placed on the upper surface of the blade so that the blade is brought into contact with the upper surface of the long blade at a predetermined angle. In a blade edge finishing device for grinding and finishing along the longitudinal direction, at least two blade edge top surface finishing grindstones are concentrically held in the grindstone shaft of the grindstone device vertically apart from each other by a predetermined dimension. The grindstone device is rotated by the grindstone position adjusting means until the grinding surface of the cutting edge upper surface finishing grindstone comes into contact at a predetermined angle with the upper surface of the blade edge of the long blade mounted on the upper surface of the chuck at a predetermined angle. And, the whetstone device is moved up and down and back and forth so that the blade edge of the long cutting tool is inserted between the whetstone upper surface finishing whetstones that are vertically held on the whetstone shaft of the whetstone device. When this is done, a gap that can relatively enter without causing the upper and lower cutting edge upper surface finishing whetstones and the blade edge of the long cutting tool to collide is secured between the at least two blade edge upper surface finishing whetstones. It is edge finishing apparatus long blade characterized by.

A third invention for obtaining a patent is, in the above-mentioned first invention or second invention, a cutting edge lower surface finishing grindstone or an upper surface finishing of a cutting edge which is held on a grindstone shaft of a grindstone device vertically with a predetermined distance. 3. The blade tip finishing device according to claim 1, wherein the grindstone is a grindstone whose upper side and lower side have different grain sizes.

In the blade edge finishing device for a long blade of the present invention, at least two blade edge lower surface finishing wheels or two blade edge upper surface finishing wheels are concentrically and vertically held by the grindstone shaft of the grindstone device. Therefore, when forming one or more steps of the blade finish surface with a predetermined angle and width on the blade front surface or blade back surface of various long blades, the rough surface finish of each surface and the grinding time are By selecting each grinding wheel in consideration, efficient grinding work becomes possible.

Further, between the upper and lower finishing grindstones, the grindstone device is turned to such an angle that the grinding surface of the grindstone can come into contact with the blade edge surface of the long blade tool at a predetermined angle, and the grindstone device is moved to the blade edge of the long blade tool. Even if it is sent to one side, there is no gap between the finishing whetstone and the blade of the long blade, so that there is no fear of damaging the long blade with the other finishing whetstone during finishing grinding.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to illustrated embodiments. 1 to 3 show an embodiment of the present invention. In FIG. 1, a long blade 3 is placed and fixed on a long bed 1 via a chuck 2 that is fixedly provided at an arbitrary inclination angle. A pair of rails 4, 4 are provided on the bed 1 in the front-rear direction along the longitudinal direction,
A table 5 is provided on the rails 4, 4 so as to be reciprocally movable.

The table 5 has a grinding wheel vertical feed motor 6
Is attached with its axis vertical, and a feed screw 7 is coaxially fixed to the drive shaft of the grinding wheel vertical feed motor 6. A grinding wheel motor 9 is attached to the feed screw 7 via an internal thread portion 8 so as to be vertically movable. A grinding wheel 11 is attached to a vertical drive shaft 10 of the grinding wheel motor 9.
Is fixed, and the hoe surface 3a of the long blade 3 can be ground with the main blade surface by rotating the grinding wheel motor 9.

Further, the table 5 is provided with a grindstone position adjusting means 12 as shown in FIGS. The grindstone position adjusting means 12 includes a front-rear movement motor 13 fixed to the table 5, a bracket 14 that is moved in the front-rear direction by the front-rear movement motor 13, and the bracket 1.
4 is a vertical movement motor 15, and the bracket 1 is moved vertically by the vertical movement motor 15.
6 and a pair of finishing feed motors 17 and 18 pivotally attached to the bracket 16.

The drive shafts of the finish feed motors 17 and 18 are provided with feed screws 19 and 20 which are coaxially fixed.
The grindstone devices 21 and 22 can be moved vertically in the axial direction. The grinding wheel devices 21 and 22 are composed of finishing motors 34 and 35, and grinding wheel shafts 36 and 37 rotated by the finishing motors 34 and 35.
37, a cutting edge upper surface finishing grindstone 23 and two cutting edge lower surface finishing grindstones 24a and 24b are respectively held, and finish grinding of the cutting edge upper surface and the cutting edge lower surface of the long cutting edge 3 is performed. Further, the rotation of the motor 13 for forward and backward movement is decelerated by the worm 25 and the worm wheel 26,
The rotation of the vertical movement motor 15 is also reduced by the worm and the worm wheel.

The grindstone device 21 is swung and rotated by a turning motor 27, a worm 28 and a worm wheel 29, and the grindstone device 22 is also turned by a turning motor 38 and a worm and a worm wheel (neither is shown). It is designed to be rotated. Further, rotation detectors 30, 31, 32, which are, for example, rotary encoders or proximity sensors, are attached to the drive shafts of the grinding wheel motor 9 and the finishing motors 34, 35, respectively.
The blade edge position detecting means in combination with a separately provided control device automatically detects the blade edge position height to be ground.

Next, the grinding operation in the case where automatic grinding is carried out by utilizing this cutting edge position detecting means will be described. First, when the automatic button with main blade surface blade is pressed, the table 5 moves to a predetermined blade edge detection position on the bed 1 and stops, and the blade edge position height to be ground is detected by a predetermined detection method. . When this detection ends, the table 5 is moved to one end of the bed 1, and the grinding wheel 11 is moved up and down by a predetermined correction value height,
Normal automatic grinding is performed by a grinder, and the main blade surface of the long blade 3 is attached. At this time, the cut amount, the number of cuts, and the number of spark outs per one time when the table 5 moves from one end to the other end of the bet 1 are set in advance. After finishing the cutting of the main blade surface, the grinding wheel 11 is raised, the table 5 is moved to one end of the bed 1, and the step of attaching the main blade surface is finished.

Next, the finish grinding of the upper and lower surfaces of the cutting edge will be described. Since each constant of the blade tip finishing operation is set in the control device when the blade tip finishing automatic button is pressed, the respective motors 13, 15, 17, 18, 27, 38 are activated and the respective blade tip finishing whetstones 23, 24a, 24b is tilted at a predetermined angle and then moved to a predetermined position. Next, the position of the cutting edge to be subjected to finish grinding is detected by a predetermined finishing edge position detecting method. When this detection is completed, the cutting edge finish grinding is performed according to the preset cutting amount, cutting frequency, and sparking frequency for the upper surface and lower surface of the cutting edge. When the upper surface of the cutting edge and the lower surface of the cutting edge have a plurality of finishing surfaces, the above operation is repeated for each angle of each finishing surface.

In the present embodiment, the grinding wheel shaft 37 of the grinding wheel device 22 for finishing the cutting edge lower surface holds two cutting edge lower surface finishing grinding wheels 24a, 24b whose upper surfaces are grinding surfaces, which are vertically separated from each other. The upper and lower two grindstones 24a and 24b have the cutting edge of the long blade 3 between the upper grindstone 24a and the lower grindstone 24b even when the grindstone device 22 is turned to the final finishing angle of the lower surface of the cutting edge. Grindstone 24a and lower grindstone 24
Since the upper and lower grindstones 24a and 24b are separated from each other so that they can relatively enter a predetermined amount without colliding with b, the lower surface of the cutting edge can be finished ground by the upper surface of the lower grindstone 24b. Has become.

In this embodiment, the grindstone device 2 for finishing the upper surface of the cutting edge is used.
The grinding wheel shaft 36 of No. 1 holds the finishing grindstone 23 of grain size 1,500, and the finishing grindstone 24a of grain size 800 is on the upper side of the grindstone shaft 37 of the grindstone device 22 for finishing the lower surface of the cutting edge, and on the lower side thereof. A finishing blade surface of one stage is provided on the upper surface (the blade table 3b side) of the blade of the long blade 3 that holds the finishing grindstone 24b having a grain size of 1,500 and has the blade surface 3b as the upper surface and is fixedly mounted on the chuck 2. On the lower surface of the cutting edge (on the side of the back of the blade 3c), the finishing surface of the second step is the finishing surface made of a grindstone with a grain size of 800, and the most advanced finishing surface is the finishing surface made of a grindstone with a grain size of 1,500. A finished cutting edge surface consisting of two steps was formed.

Next, another embodiment will be described. In FIG. 4, two grindstone upper surface finishing grindstones 23a having a lower surface as a grinding surface are provided on the grindstone shaft 36 of the grindstone device 21 for finishing the upper surface of the cutting edge.
23b are held up and down, and the grinding wheel shaft 37 of the grinding wheel device 22 for finishing the lower surface of the cutting edge holds two grinding wheels 24a, 24b for finishing the lower cutting edge whose upper surface is a grinding surface as in the above embodiment. ing. The upper and lower whetstones, respectively, even when the respective whetstone devices 21 and 22 are turned to the final finishing angles of the upper and lower surfaces of the cutting edge, the cutting edges of the long blade 3 collide between the respective upper and lower grinding wheels. The upper and lower sides are separated from each other so as to secure a gap that can relatively enter a predetermined amount.

In this embodiment, the grindstone device 2 for finishing the upper surface of the cutting edge is used.
The grindstone 23a with a grain size of 800 is on the upper side of the grindstone shaft 36 of No. 1
However, a grindstone 23b having a grain size of 1,500 is held below the grindstone shaft 3 of the grindstone device 22 for finishing the lower surface of the cutting edge.
7, a grindstone 24a with a grain size of 1,500 is held, and a grindstone 24b with a grain size of 3,000 is held on the lower side. Then, the long blade 3 having the main blade surface previously grinded by the main blade surface grinding wheel is placed and fixed on the chuck 2 with the back 3c side as the upper surface, and the blade tip upper surface of the long blade 3 (the back 3c side). Has a two-step finishing edge surface formed by the blade upper surface finishing whetstones 23a and 23b, and two steps of the blade lower surface finishing blades 24a, 24b form a two-step finishing edge surface on the blade lower surface (on the blade table 3b side).

Although the grain sizes of the grindstones are specifically shown and described in the above-mentioned two embodiments, the grain size of each grindstone may be appropriately selected depending on the material and hardness of the tool to be ground, and the grinding time and the grinding time, respectively. It is determined by relatively determining the required surface roughness of the finished surface, and is not limited to the above-mentioned grindstone grain size. Further, the upper and lower finishing grindstones may have the same grindstone diameter, or different finishing grindstones may be appropriately used. Further, the number of upper and lower finishing whetstones is not limited to two, and it is possible to hold three upper and lower finishing whetstones.

Further, even when the finishing surface of the cutting edge is one step, pre-grinding is first carried out in a short time by the rougher one of the upper and lower finishing grindstones, and thereafter the surface finishing roughness is increased by the other fine finishing grindstone. It is also possible to carry out, and even in the case of one-step finishing, it is possible to perform the cutting edge finishing grinding which can satisfy both the grinding time and the surface roughness. Also, the grindstone shafts 36, 3
It is also possible to hold the finishing grindstones of the same grain size above and below 7, and double the time until the finishing grindstone is replaced to improve work efficiency.

[0029]

As described above, according to the cutting edge finishing apparatus of the first invention, the second invention and the third invention, one set of grindstone devices is provided for one finishing grindstone, and as a result, for finishing grindstone positioning. The number of control axes was increased, and multiple finishing whetstones were provided on the whetstone shaft of each whetstone device without making it a complicated and expensive cutting edge finishing device, so it was ground at a predetermined angle by the main cutting edge grinding wheel. Considering the rough surface finish and the grinding time of each finished surface to form one or multiple steps of the finished surface of the cutting edge at a predetermined angle and width on the front surface and the back surface of the cutting edge, respectively. By selecting and holding a grinding stone with the optimum grain size for each of the finishing wheels for finishing the upper surface of the cutting edge or for finishing the lower surface of the cutting edge, efficient finishing grinding work becomes possible, and the finishing surface can be finished in a shorter time than before. The surface roughness of It is possible to the surface roughness. Further, it is possible to reduce the consumption of the grinding stone by grinding the finishing grinding of the wide portion and the final finishing grinding of the narrow width with the finishing grinding stones having different grain sizes.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a long blade grinder provided with a blade finishing device according to the present invention.

FIG. 2 is a side view showing a cutting edge finishing device section.

FIG. 3 is an enlarged view of a main part of a cutting edge finishing device section.

FIG. 4 is a side view of a main part of a cutting edge finishing device according to another embodiment.

FIG. 5 is an enlarged view showing an example of a finish shape of a long blade.

[Description of sign]

 1 Bed 2 Chuck 3 Long Blade 5 Table 6 Grinding Wheel Up / Down Feed Motor 9 Grinding Wheel Motor 10 Drive Shaft 11 Grinding Wheel 12 Grinding Wheel Position Adjusting Means 13 Forward / Backward Motor 15 Vertical Moving Motor 17 Finishing Feed Motor 18 Finishing Feed Motor 21 Grinding Wheel Device 22 Grinding Wheel Device 23 Cutting Edge Top Finishing Grinding Wheel 24 Cutting Edge Bottom Finishing Grinding Wheel 34 Finishing Motor 35 Finishing Motor

Claims (3)

[Claims] 1. A chuck that is fixed to a long bed at an arbitrary inclination angle and that mounts and fixes a long blade on its upper surface, and a front and rear provided along the longitudinal direction of the long bed. On a pair of rails, a table which is vertically opposed to the chuck and is reciprocally movable by a driving means, and a grindstone position adjusting means provided at a predetermined position of the table, the upper surface of which is a grinding surface, A grindstone device holding a cutting edge lower surface finishing grindstone to which rotation is given by a driving means is vertically moved, moved back and forth, and swung, and a grinding surface of the cutting edge lower surface finishing grindstone is placed on the upper surface of the chuck. It consists of a grindstone position adjusting means for adjusting the position so as to contact the lower surface of the blade of the long blade at a predetermined angle, and finishes the lower surface of the blade of the long blade along the longitudinal direction by the grinding wheel for finishing the lower surface of the blade. In a blade edge finishing device for long blades, at least two blade edge bottom surface finishing grindstones are concentrically and vertically held by a grindstone shaft of the grindstone device, and are held at a predetermined angle on the upper surface of the chuck. The grindstone device is rotated by the grindstone position adjusting means to an angle at which the grinding surface of the blade lower surface finishing grindstone can come into contact with the lower surface of the blade of the long blade placed at a predetermined angle, and When the whetstone device is moved up and down and back and forth so that the blade edge of the long blade enters a predetermined amount between the whetstone bottom surface finishing whetstones that are held vertically apart from each other on the whetstone shaft, A long blade characterized in that a gap is relatively secured between the at least two cutting edge lower surface finishing wheels without collision between the blade lower surface finishing wheel and the blade edge of the long blade. Cutting edge Above apparatus. 2. A chuck provided on a long bed so as to be fixed at an arbitrary inclination angle, and a chuck for mounting and fixing a long blade on the upper surface thereof, and a front and rear provided along the longitudinal direction of the long bed. On a pair of rails, a table, which is vertically opposed to the chuck and is reciprocally movable by a driving means, and a grindstone position adjusting means provided at a predetermined position of the table, the lower surface being a grinding surface, A grindstone device holding a cutting edge upper surface finishing grindstone to which rotation is given by a driving means is vertically moved, moved back and forth, and swung, and a grinding surface of the cutting edge upper surface finishing grindstone is placed on the upper surface of the chuck. It consists of a grindstone position adjusting means for adjusting the position so as to make contact with the upper surface of the blade of the knives at a predetermined angle, and finishes the upper surface of the blade of the long blade along the longitudinal direction by the grinding wheel for finishing the upper surface of the blade. In the blade edge finishing device for long blades, at least two blade edge top surface finishing grindstones are concentrically and vertically held by a grindstone shaft of the grindstone device, and are held at a predetermined angle on the upper surface of the chuck. The grindstone device is rotated by the grindstone position adjusting means to an angle at which the grinding surface of the blade upper surface finishing grindstone can come into contact with the upper surface of the blade of the long blade mounted at a predetermined angle, and When the whetstone device is moved up and down and back and forth so that the blade edge of the long blade enters a predetermined amount between the upper surface finishing whetstones that are held vertically apart from each other on the whetstone shaft, A long blade characterized in that a gap is relatively secured between the at least two cutting edge upper surface finishing whetstones without collision between the blade edge upper surface finishing whetstone and the blade edge of the long blade. Cutting edge Above apparatus. 3. A cutting edge lower surface finishing grindstone or a cutting edge upper surface finishing grindstone vertically and vertically held by a grindstone shaft of a grindstone device, wherein the upper side and the lower side have different grain sizes. The blade edge finishing device according to claim 1 or 2.