JPH0518045Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is suitable for a metal engraving chisel with a blade shape that has a high cutting ability and is formed by a plurality of arcuate curved surfaces with required angles and a flat polished surface. Regarding polishing machines.

[Conventional technology]

Up until now, metal engraving chisels with cutting ability were made by skilled hand-sharpening craftsmanship by a small number of engravers whose professions were separate from those of jewelers, and the techniques used were secret.

There are various shapes of chisels, but the one shown in Figure 4 is an enlarged perspective view of the blade part 1 of a single-cut chisel and a shibuki chisel, which are cutting chisels that can carve most of Western and Japanese carvings. These are side views showing the state of the shib chisel when it is used for metal engraving.The upper row shows a chisel with cutting power, and the lower row shows a carbide chisel sold by Kazu Tools Store.

The main difference between the two is the polished surfaces a, b, b shown in the upper row.
The blade has an arcuate curved surface, and the cutting force is extremely high and the life of the blade body is long, but the polished surfaces a', b', and b' shown in the lower row are formed as flat surfaces.

The carbide chisel sold at the above-mentioned Kazu Tool Shop has a flat polishing surface and is easy to polish, but has the drawback of low cutting ability and easy breakage of the cutting edge. However, although chisels with arcuate blades have high cutting ability and are useful, there is no machine that can easily sharpen them.

In addition, the polishing machine technology includes: Actual Publication No. 51-44234 (74K25) Actual Publication No. 60-15638 (B24B 3/54) Utility Model No. 55-125755 (B24B 3/36) Utsukai No. 55-17709 (B24B 3/38) etc. are disclosed.

[Problem that the invention attempts to solve]

As mentioned above, conventionally, the technique for polishing the arcuate blade of a chisel having an arcuate blade was a secret technique that required skill, and a simple and inexpensive polishing machine was required.

Furthermore, in metal engraving classes, for example, the content is the production and repair of jewelry, and the reason why there is no technical guidance on carving patterns and letters into metal using a cutting chisel is because most beginners are unfamiliar with it. This was because it was expected that a large amount of labor would have to be provided for repairing and polishing the broken chisel due to the way it was used.

In other words, the reality is that there is no polishing machine that can easily sharpen this kind of chisel.

An important objective of the present invention is to provide a polishing machine that allows even an amateur to accurately polish an arcuate blade portion.

[Means for solving problems]

In the present invention, a pair of pillars is erected with the lower end fixed to a mounting base, several vertical screw holes are provided in each of the pillars, and one end of the pair of guide rails is fixed to the screw hole and tilted. Attachment: A short pipe that slides on the guide rail or a wheel that rolls on the guide rail is installed so that it can move up and down diagonally with the rotating shaft facing the polishing direction, and a clip with a chisel fixing device attached to the rotating shaft is attached and detached. The chisel fixing tool has a substantially U-shaped clamping part to clamp and fix the chisel to be polished, and the tip of the chisel to be polished is attached to the polishing body (grinding stone) installed on the mounting table. etc)
polishing of an arc-shaped blade of a metal carving chisel, characterized in that the blade body of the metal carving chisel to be polished is polished in an arc shape by rotating the rotating shaft at a predetermined angle while moving up and down incliningly according to the guide rail; It is a machine.

A method of arc-shape polishing using the arc-shape blade polisher for a metal carving chisel according to the present invention will be explained.

In the present invention, in order to grind into an arc-shaped blade, as shown in Fig. 4 (schematic diagram A), the required displacement in the grinding direction from the α angle to the β angle, the change in the grinding angle θ, and various conditions with different conditions are used. If the permissible sliding contact distance of the chisel tip that promotes a change in the θ angle on the polishing body is l distance, then the reciprocating action of the chisel tip within the l distance is made parallel to the circular arc on the blade part 1. The structure is designed to encourage sliding movement.

The arc-shaped blade portion can be polished extremely easily by slidingly moving while rotating at an angle of θ.

Therefore, when polishing the arcuate blade of the chisel blade body, the other end of the chisel fixture 2 is rotatable as shown in FIG.
It is possible to drive.

Furthermore, one clip 3 of the chisel polishing fixture 2 can be attached to and detached from the rotating shaft 4 with a single touch, thereby speeding up the polishing work.

We also propose that the clip 3, which can be attached and detached from the rotating shaft 4, is provided with regular polygonal column joint shafts 2b, 2b', and the polishing angle can be adjusted to a constant required angle in the direction perpendicular to the shaft.

The reciprocation of the rotary shaft 4 causes the chisel blade body portion 1 to slide in an arc on the polishing body, thereby obtaining one polishing surface a of an arcuate curved surface.

Furthermore, under the condition that the length from the rotating shaft 4 to the cutting tip of the chisel blade section 1 attached to the chisel fixture 2 is constant, the longer the traveling distance of the chisel on the flat polishing body 8, the greater the θ polishing angle. As the number increases, the degree of arcuate curvature of the polished surface of the chisel also increases.

Therefore, the moving distance of the guide rails 5, 5 of the rotating shaft 4 and the degree of arcuate curvature of the polished surface of the chisel are proportional.
The shorter the moving distance of the chisel 5, the more nearly flat the polished surface of the chisel can be.

〔Example〕

Next, embodiments will be described based on the drawings.

FIG. 1 is a perspective view showing an embodiment of the arc-shaped blade polishing machine for a metal carving chisel of this invention.

Supports 6, 6 with their lower ends fixed are erected on a mounting base 7 having a polishing body 8 on the tip side, and several vertical screw holes are provided in the supports 6, 6 to form a bearing track for the rotating shaft 4. One end of the pair of guide rails 5, 5 is fixed with a thumbscrew, and the other end is attached to a mounting base 7 so that the inclination angle can be varied.

These guide rails 5, 5 have sliding short pipes 9,
9 is provided, and a rotating shaft 4 is provided on a central shaft 11 that connects the short pipes 9, 9 to form a bridge.

The rotating shaft 4 is provided with a slight gap from the central shaft 11, and is installed to be rotatable and movable diagonally up and down in the polishing direction.

A chisel fixture 2 is detachably attached to the rotary shaft 4 with a clip 3.

The chisel fixing tool 2 has a substantially U-shaped clamping part on its tip to which a polished engraving chisel is attached, and is clamped and held with a thumb screw.

The polished engraving chisel 1 attached to the chisel fixture 2 brings its tip into sliding contact with the polishing body 8 of the mounting base 7 under its own weight, and moves the rotary shaft 4 up and down to shape the blade part 1 of the engraving chisel into an arcuate shape. Polish to.

2A and 2B are a side view and a front view of the clip 3 having hexagonal regular polygonal column joint shafts 2b and 2b' shown in FIG. 1, among which one regular polygonal column joint shaft 2b
The clip 3 is fixed with the wide side of the approximately U-shaped clamping part in the vertical position, and the other regular polygonal column joint shaft 2b' is fixed with the side surface of the approximately U-shaped clamping part in the vertical position. Fixed to.

Each of the regular polygonal column joint shafts 2b, 2b' is inserted into a polygonal receiving hole 2a provided at the rear of the chisel fixture 2, thereby making it possible to change the required polishing surface and adjust the polishing angle.

In addition, the configuration of the vertical movement of the rotary shaft 4 that moves up and down the guide rails 5, 5 is shown in FIG.
Short tubes 9 for sliding are attached to both ends of the rotary shaft 4 to allow the rotary shaft 4 to move up and down freely, but a configuration in which wheels 10 are provided at both ends of the rotary shaft 4 as shown in FIG. 5 is also proposed.

The reciprocating operation of sliding the rotary shaft 4, which rotates and moves up and down diagonally, results in a repetitive movement back and forth accompanied by an arcuate sliding movement of the contact point of the blade portion 1 on the polishing body 8.

Incidentally, as the polishing body 8, in addition to the grindstone of the embodiment, an electric belt-shaped or foil-shaped polishing body can be attached.

Next, how to use this invention having the above configuration will be explained.

First, an example of polishing a single-cut chisel based on the embodiment shown in FIG. 1 is shown. The back side of the chisel is fixed to the chisel fixture 2 upward, and the regular polygonal prism joint shaft 2b is inserted into the receiving hole 2a provided at the rear of the chisel fixture 2. After inserting and connecting, the other end clip 3 is attached to the rotating shaft 4, and the position of the polishing body (grindstone) is determined so that the α angle is 30 degrees and the β angle is 10 degrees.

Next, by holding the clip 3 by hand and sliding the rotary shaft 4 obliquely up and down, a grinding curved surface a can be obtained on the cutting edge of the single cutting chisel on the grinding body (grindstone) 8.

Next, remove and attach the regular polygonal prism joint shaft 2b, and turn the single-cutting chisel fixed to the chisel fixture 2 upside down, with the chisel side facing up and the back cutting edge of the single-cutting chisel at a γ angle of about 25 degrees. .

Holding the chisel fixing device 2 and pressing the back edge of the single-cutting chisel with your fingers, slide it back and forth over the grindstone 8 several times within a range of about 5 mm. With the added play created by the space between the rotating shaft pipe 4 and the central shaft 11, and the gap between the guide rails 5, 5 and the short tube 9, a quasi-flat grinding surface c is obtained.

This method is similar to the conventional hand-sharpening method for engraving chisels, which does not use a grinder.

Furthermore, even if the short pipes 9, 9 of the guide rails 5, 5 are fixed in a predetermined position with clips or the like to maintain the γ angle, and the grindstone 8 itself on the base is slid back and forth, a flat polished surface c can be obtained. It will be done.

Even if the polishing body 8 is a belt-shaped or foil-shaped driving body, if the γ angle is kept constant as described above, the sliding contact polishing surface of the chisel tip will be a flat polishing surface c.
become.

Regardless of the type of polishing body 8, whether it is a grindstone or a driven polishing body, polishing at an angle of θ can be achieved by sliding the rotating shaft 4 in an oblique vertical motion.
A polished curved surface can be obtained on the tip of the chisel that slides under its own weight.

For grinding the chisel, use the regular polygonal columnar joint shaft 2b', set the α angle to 25 degrees, the β angle to 10 degrees, and set the left-tilt grinding angle to 30 degrees. Obtain an arcuate curved surface on the left side surface, then replace the regular polygonal prism joint shaft 2b' with the receiving hole 2a with a right-inclined polishing angle of 30 degrees, and perform the same operation as above to obtain an arcuate polished surface b symmetrical to the left side surface on the right side. This time, using another regular polygonal prism joint shaft 2b, the same process as the above-described flat polishing (γ angle polishing) of the back cutting edge of the single-cut chisel is carried out to obtain a flat polished surface c on the back cutting edge.

When polishing a chisel with a large θ polishing angle, use several vertical rows of high-position screw holes on the pillars 6, 6 to increase the angle of the guide rail.

The back polished surface c of both the cutter chisel and the shive chisel is flat, and if the polished surface c is short and shallow, even if it is a semi-flat polished surface, the cutting power will not be lost and a metal engraving chisel with high cutting power will be obtained. be able to.

Note that the arc-shaped polished surfaces a, b, and b on the ventral surface are polished sparsely (θ angle polishing), and only the flat polished surface c on the back surface is polished (γ angle polished) with high frequency, resulting in a long and deep flat surface. If the surface becomes polished, the tip position of the chisel will be displaced and the cutting force will be lost, so it is necessary to polish both the arcuate polished surface and the flat polished surface at a well-balanced frequency.

If you use a carbide chisel and the tip of the chisel is frequently damaged, use a diamond grindstone of about 1000 grit as shown in Figure 1, and then use a finishing whetstone of 2000 grit installed in parallel.
When using the grindstones arranged side by side, it is sufficient to shift the clip 3 that clamps the rotating shaft 4 to the left and right in the lateral direction, as shown by the arrow A in FIG.

Moreover, even if the regular polygonal column joint shafts 2b, 2b' are attached and detached, the polishing angle does not change at all.

The embodiment shown in FIG. 6 has a configuration in which the clip 3 and the chisel fixture 2 are connected by an angle adjustment connector 20 with a scale that displays the rotation angle. This is done by rotating the tool 20.

[Effect of idea]

The arc-shaped blade polishing machine for a metal carving chisel according to this invention has the above-mentioned construction and operation, and has the following unique technical effects.

Even beginners can easily sharpen a metal chisel that has the cutting power to cut minute, geometrically precise shapes without having to concentrate all their attention on their fingertips as they would when sharpening by hand.

This eliminates the need for training in polishing techniques, allowing you to easily get used to metal engraving.

Unlike cutlery such as knives and planes, most chisel widths for metal engraving are less than 1 mm, so if you use diamond whetstones installed in parallel with the rough and finishing whetstones, you can sharpen carbide chisels by manual sliding. It's easy.

Therefore, there is no need to drive the grindstone, and there is no need to worry about the rotational force acting from the side in the polishing direction, which is a drawback of rotary grindstones, causing the tip of the chisel to flow to one side, resulting in a deformed polished surface, and there is no need for a motor, etc. It also has the advantage of being inexpensive.

As described above, the arc-shaped blade polishing machine for a metal carving chisel according to the present invention objectively and facilitates the polishing of a chisel having a minute and precise arc-shaped blade portion, and has extremely practical value.

[Brief explanation of drawings]

The drawings show an embodiment of the arc-shaped blade polishing machine for a metal chisel according to the present invention. Fig. 1 is a perspective view showing the state of use, and Fig. 2 A shows a regular polygonal column joint shaft provided on a connecting member. Figure 2 (B) is a front view, and Figure 3 is an enlarged perspective view of the cutting edge of a single-cut chisel/shibu chisel, and a side view of the chisel in use. , the bottom row shows a chisel sold at a tool shop. FIG. 4 is a side view of the arcuate polished surface (A) and the planar polished surface (B), both showing chisel polishing angles facing in the polishing direction. FIG. 5 is a perspective view showing a different embodiment in use. A simple explanation of the symbols, 1... chisel blade, 2...
Chisel fixing tool, 2a... Receiving hole, 2b, 2b'... Regular polygonal column joint shaft, 3... Clip, 4... Rotating shaft, 5...
...Guide rail, 6... Support column, 7... Mounting base, 8...
... Polishing body (grindstone), 9 ... Short pipe, 10 ... Wheel,
11... Central axis, 20... Angle adjustment connector.

Claims (1)

[Scope of utility model registration request] Fix the lower end to the mounting base and set up a pair of pillars,
Each of the pillars is provided with several vertical screw holes, one end of a pair of guide rails is fixed in the screw holes and installed at an angle, and a short pipe slides on the guide rail or a wheel rolls on the guide rail. A rotary shaft is installed on the rotary shaft so that it can freely move up and down diagonally in the polishing direction, and a clip with a chisel fixing device attached thereto is detachably attached to the rotary shaft, and the chisel fixing device is provided with a substantially U-shaped clamping part. A metal carving chisel to be polished is clamped and fixed, the tip of the held metal carving chisel to be polished is brought into sliding contact with a polishing body (grinding stone, etc.) set on a mounting table, and the rotating shaft is tilted up and down according to the guide rail. An arc-shaped blade polishing machine for a metal engraving chisel, which is characterized by rotating a predetermined angle while moving the chisel and polishing the blade body of the metal chisel to be polished in an arc shape.