JPH0779880B2 - Scissors blade and manufacturing method thereof - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scissor blade and a method for manufacturing the same, and more specifically, a contour line in a width direction of an outer side surface is an arc shape, and the outer side surface. The present invention relates to a blade body of scissors ground in a spiral shape twisted in the length direction and a method for manufacturing the same.

(Prior Art) Conventional scissors have a blade body whose outer surface is mainly ground by a disc-shaped grindstone, so that the strength of the tapered tip of the blade body is low and There was a problem that the sharpness would be poor unless a wide area was formed. In particular,
In a ceramic blade that is brittle and easily broken, it is necessary to increase the strength of the tapered tip portion.

Therefore, in order to improve the strength of the tip of the blade, to give a high-quality feel to the touch, and to improve the design, scissors with the outer shape of the outer surface of the blade rounded in the width direction are used. Although desired, grinding of the blade body is performed by hand only by a craftsman who relies on experience and intuition using a plate-shaped grindstone, and in reality, is hardly manufactured.

(Problems to be solved by the invention) In the blade body that is manually ground by the conventional scissors, it is advantageous in terms of strength as compared with a blade body that is ground in a flat shape, but the outer surface is accurately ground. However, the sharpness may vary depending on each blade as it is,
There is a problem that the blade of the blade body needs to be ground again in order to provide a blade body having a uniform sharpness.

Further, there is a problem that a great labor is required to grind a very hard ceramic blade body by hand.

Therefore, the invention according to claim 1 has been made as a result of earnest studies by the present applicant in view of the above circumstances,
The object of the present invention is a scissor blade whose outer shape in the width direction of the outer surface is arcuate, and this arcuate shape is ground while twisting from the base end to the tip end of the blade, resulting in strength and a high-class feeling. It is to provide a blade of scissors excellent in the above.

Further, the invention according to claim 2 is to provide a method of manufacturing a scissor blade capable of easily and accurately manufacturing a blade excellent in strength and high quality.

(Means for Solving the Problem) In order to achieve the above object, in the scissors blade according to claim 1, the scissors blade has an outer side surface having an arcuate outer shape in the width direction. , The blade edge angle of the blade body is gradually increased from the base end portion of the blade body to the tip portion, the arc shape is ground while twisting from the base end portion of the blade body to the tip portion. .

Further, in the method for manufacturing a scissor blade according to claim 2,
The annular grindstone is rotationally driven in the axial direction, the length direction of the long plate-shaped blade material is substantially parallel to the axial direction,
While abutting the outer surface of the blade material on the inner circumference of the grindstone,
By relatively moving the blade body material in the length direction with respect to the grindstone, at that time, by rotating the blade body material relative to the grindstone on the rotating shaft in the length direction, the cutting edge angle is It is characterized by grinding while twisting little by little so that it gradually increases from the base end to the tip of the blade material.

(Operation) The operation of the above-described structure according to claim 1 will be described with reference to FIG. 3 of the embodiment.

First, in the blade body of the scissors, the blade angle is gradually increased from the base end portion to the tip end portion of the blade body. That is, the cutting edge angle is an angle formed by "line bc" and "tangential line of arc ab at point b" on the base end side, and "line ef" and "point e on the tip side". Angle formed by the tangent line of the arc d-e of.

By doing this, the thickness of the ridge on the tip side (the distance between the line ef and the point d) becomes thicker than the thickness of the ridge (the distance between the line ef and the point a) when it is assumed that no twist occurs. Therefore, the strength of the tip portion is maintained high, the elasticity is improved, and the sharpness is excellent. In addition, the peak means "a thick portion (from" Koteizumi ") on the side opposite to the blade of a single-edged knife.

Further, according to the configuration described in claim 2, the blade body material that abuts on the inner circumference of the circular grindstone can change the angle formed with the inner circumferential surface of the grindstone at each position in the lengthwise direction of the blade body material. it can. At this time, if the abutment is made such that the angle formed by the blade body material with the inner peripheral surface of the grindstone is gradually increased from the base end portion to the tip end portion of the blade body, the “outer side surface width direction A scissors blade having an outer shape of an arc shape, wherein the blade edge angle of the blade body is gradually increased from the base end portion to the tip end portion of the blade body so that the arc shape is the base end portion of the blade body. It is possible to manufacture a scissors blade body characterized by being ground while twisting from the end to the tip.

(Example) Next, an example of a scissor blade embodying the present invention according to claim 1 will be described with reference to the drawings.

As shown in FIGS. 1 to 4, the blade body (11) of the scissors (10) of the present embodiment is a blade body of scissors in which the widthwise outline of the outer side surface (F) is an arc shape from the cutting edge. The arcuate shape is ground while twisting from the base end portion to the tip end portion of the blade body so that the blade edge angle of the blade body gradually increases from the base end portion to the tip end portion of the blade body.

In the scissors (10) including the blade body (11) having the complicated shape, the strength of the tip portion of the blade body (11) is maintained high, the elasticity is improved, and the sharpness is excellent. Therefore, the blade (1
1) may be made of a brittle and easily broken ceramic material.

Further, the scissors (10) made of this blade body (11) not only has an excellent feel to the touch, but also have an improved design.

Next, the method for manufacturing the blade body (11) of the scissors (10) and the scissors (1
The action of the blade body (11) of (0) will be described.

First, in order to manufacture the blade body (11) of this scissors (10),
As shown in the figure, a grindstone (20) having an annular inner surface having a predetermined width is prepared. This grindstone (20) is appropriately selected such as one mainly composed of zirconia abrasive grains, cubic boron nitride abrasive grains, or diamond abrasive grains.
The grindstone (20) is attached to the inner peripheral surface of the opening of the metallic cylindrical support member (30) as shown in FIGS. 5 and 6.

Next, the support member (30) is connected to a rotary shaft of a grinder or the like, and the grindstone (20) is rotationally driven in the axial direction.

On the other hand, the blade material (12) before being ground is fixed to an elongated processing table (40). Then, as shown in FIG. 1, the lengthwise direction of the long plate-shaped blade body material (12) is made substantially parallel to the axial center direction, and the blade body material ( The blade material (12) is moved in the longitudinal direction relative to the grindstone (20) while the outer surface of the blade body (12) is being abutted, while the blade material (12) is rotated in the longitudinal direction. By rotating the shaft relative to the grindstone (20), grinding is performed while twisting little by little so that the blade edge angle gradually increases from the base end portion to the tip end portion of the blade body material (12). At this time, it goes without saying that the grindstone (20) is cooled with a grinding liquid such as water. The cutting table (40) for the blade material (12) and the grindstone (2)
0) may be controlled and driven at the same time.

Then, the widthwise outline of the outer side surface (F) is a scissor blade (11) having an arc shape, and the blade edge angle of the blade extends from the base end to the tip of the blade (11). It is possible to easily provide the blade body (11) whose arcuate shape is ground while twisting from the base end portion to the tip end portion of the blade body (11) so as to be gradually increased.

The cross-sectional shape of the blade body (11) will be described in more detail. A cross section of the blade body (11) on the base end side (A in FIG. 2).
-A line) indicates a point a-b- as shown in FIGS. 3 and 4.
The shape is c. Then, the cross section (line BB in FIG. 2) on the tip end side of the blade body (11) has a shape of points d-e-f (the shape of the blade body shown by the solid line in FIG. 4).

Comparing these two shapes in FIG. 3, the thickness of the ridge (distance between ef of the line and point d) on the tip side of the blade (11) (line BB in FIG. 2) is , Which is thicker than the ridge thickness (distance between the line ef and the point a) on the assumption that no twist is generated, and accordingly, the strength of the tip portion is maintained high, the elasticity is improved, and the sharpness is excellent. Become.

Further, unlike the manual grinding, the blade body material (12) is precisely machined, so that it is not necessary to grind the cutting edge later, and the blade body (11) can be cut quickly and with good sharpness. ) Can be manufactured.

The present invention is not limited to the above embodiment,
The cutting edge may be ground again later, or the cross-sectional shape of the blade may be changed as appropriate without departing from the spirit of the present invention.

(Effect of the invention) As described above in detail, in the scissors blade of the invention described in claim 1, the outer shape of the outer surface of the blade in the width direction has an arc shape, and the cutting edge angle of this blade is , So as to gradually increase from the base end portion to the tip end portion of the blade body, since the arc shape has a twisted shape from the base end portion to the tip end portion of the blade body,
The strength of the tip portion is maintained high, the elasticity is improved, and the sharpness is excellent. further,
The scissors provided with this blade not only have a high-quality feel to the touch, but also have an improved design.

Further, in the method for manufacturing a scissor blade according to claim 2,
The outer shape of the outer surface in the width direction is a scissor blade having an arc shape, and the blade edge angle of the blade body is gradually increased from the base end portion to the tip end portion of the blade body so that the arc shape is This has an excellent effect that a blade body that is ground while being twisted from the base end portion to the tip end portion of the blade body can be easily provided. In addition, unlike the manual grinding, grinding of the blade material by this manufacturing method is performed accurately by the machine, so there is no need to re-grind the cutting edge later, and a sharp blade can be manufactured quickly. It has an excellent effect that it can.

[Brief description of drawings]

FIG. 1 is a perspective view of a grindstone and a blade material showing a state of manufacturing an embodiment of a scissor blade body embodying the invention of claim 1, and FIG. 2 is a perspective view of the invention of claim 1. FIG. 3 is a plan view of scissors provided with the embodied blade, and FIG. 3 is an enlarged cross-sectional view of the blade showing a state in which two cross-sectional shapes on the base end side and the tip end side of the blade are overlapped and compared with each other. The figure is an enlarged cross-sectional view of the blade body cut along the line BB in FIG. 2, FIG. 5 is a front view of a grindstone grinding the blade body material, and FIG. 6 is a grindstone used for grinding the scissor blade body. FIG. Explanation of symbols 10 …… Scissors, 11 …… Blade, 12 …… Blade material, 20 …… Whetstone,
30 …… Supporting member, 40 …… Processing table, F …… Outside surface.

Claims (2)

[Claims] 1. A scissor blade having an outer shape in the width direction of which an arcuate outer shape has an arc shape, wherein a blade angle of the blade gradually increases from a base end portion to a tip end portion of the blade body. A blade body of scissors, wherein the arc shape is ground while twisting from a base end portion to a tip end portion of the blade body. 2. An annular grindstone is rotationally driven in the axial direction thereof so that the lengthwise direction of the long plate-shaped blade material is substantially parallel to the axial center direction, and the blade is provided on the inner circumference of the grindstone. While abutting the outer surface of the body material, the blade body material is relatively moved in the length direction with respect to the grindstone. A method of manufacturing a scissor blade body, which comprises twisting and grinding while gradually twisting so that the blade edge angle gradually increases from the base end portion to the tip end portion of the blade body material.