JP2896318B2 - How to make blades for scissors - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a pair of scissors which support a pair of blades so that the blades can be opened and closed.

[0002]

2. Description of the Related Art In conventional scissors, FIGS.
After the blade 1 is formed as shown in FIG. Then, as shown in FIGS. 5 (c) and 5 (d), the blade portion 3 of the blade 1 is machined into a chamfer 6a with a small blade on the abdominal edge 3a side of the surface 6 thereof. Next, as shown in FIG.
The cutting edge 8 is formed on the abdominal edge 3a of the chamfer 6a with a small blade. Here, buffing refers to polishing a workpiece surface by rotating a soft buffing wheel such as cloth or felt having fine abrasive particles fixed or adhered to the surface.

[0003]

However, since the chamfer 6a with a small blade is formed by machining, it is troublesome to form the chamfer 6a with a small blade during the manufacturing process of the blade 1. Also, since the buff polishing is performed manually, there are problems in terms of work efficiency and manufacturing cost.

An object of the present invention is to simplify the manufacturing process of a blade by proposing a manufacturing method completely different from the conventional method.

[0005]

As shown in the drawings (FIGS. 1 to 4) of the embodiments described later, the blade of the scissors according to the present invention is manufactured by the following procedure. First, as shown in FIG. 1, a blade (1) is press-processed to form an abdominal edge (3) of a blade (3).
By bending the a) side, a chamfer with a small blade (6a) is formed on the abdominal edge (3a) side of the surface (6) at the blade portion (3).
Is molded. Next, as shown in FIG.
The back surface (7) is scraped off in a substantially flat shape,
By forming a), the thickness (T) between the chamfer (6a) with the small blade on the surface (6) and the back rake face (7a) is changed from the back edge (3b) side to the abdomen edge ( 3a) It becomes thinner toward the side. Next, as shown in FIG. 3, a cutting edge (8) is formed on the abdominal edge (3a) of the chamfer for small blades (6a).

[0006]

As described above, since the press working is used to form the chamfer (6a) with small blades, the manufacturing process of the blade (1) is simplified. For example, when barrel polishing is performed on the blade 1 of FIG. 1, the abdominal edge (3a) of the blade portion (3)
Although a dripping portion is likely to be formed, the dripping portion is shaved off by forming the back face (7a) shown in FIG. 2, so that a cutting edge (8) is formed on the abdominal edge (3a) as shown in FIG. In this case, this dripping portion does not remain, and good sharpness is obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a blade according to an embodiment of the present invention will be described below with reference to FIGS.

First, as shown in FIG. 1, the material of the blade 1 is integrally formed by press working. This blade 1 has a shaft support hole 2
The blade 3 is provided on the distal end side of the shaft support hole 2, and the handle 4 is provided on the base end side of the shaft support hole 2. In this blade portion 3, the width between the abdominal edge 3a and the back edge 3b becomes narrower toward the tip 1a of the blade 1. From the vicinity of the shaft support hole 2 to the point 1 a
The torsion inclined plate portion 5 is bent between the two. The front surface 6 and the back surface 7 between the abdominal edge 3a and the back edge 3b in the torsion inclined plate portion 5 are parallel to each other while being inclined with respect to a plane P including the center line 2a of the shaft support hole 2 and passing through the point 1a. The thickness T between the front and back surfaces 6 and 7 is the same.

Next, after performing a heat treatment on the blade 1 of FIG.
Rough finishing is performed by barrel polishing. Further, after the blade 1 is subjected to heat treatment, finishing is performed by barrel polishing. Here, barrel polishing means that a mixture of a large number of workpieces (small articles), media (particles) and a liquid is placed in a barrel (barrel) with a horizontal or near-horizontal axis and stirred for a long time. It refers to surface treatment.

Next, as shown in FIG.
Is ground by a surface grinder and ground into a flat shape to form a back surface 7a orthogonal to the plane P. The surface 6 becomes a chamfer 6a with a small blade as it is. This chamfer 6
a is a back clearance face 7 from the back edge 3b side toward the belly edge 3a side.
In the chamfer 6a, the thickness T between the chamfer 6a and the back surface 7a becomes thinner toward the abdominal edge 3a.

Next, as shown in FIG. 3, a cutting edge 8 is formed on the abdominal edge 3a of the chamfer 6a with a small blade. Next, as shown in FIG. 4, the two blades 1 are overlapped with each other by sliding the back rake faces 7 a to each other, and the two blades 1 are attached to the shaft support holes 2 of the both blades 1 through the opening / closing center shaft 9.

In particular, in this embodiment, since the press working is used for forming the chamfer 6a with a small blade, the manufacturing process of the blade 1 can be simplified. In addition, barrel polishing is more efficient in operation than buff polishing and is advantageous in reducing manufacturing costs. When this barrel polishing is performed, a dripping portion is likely to be formed on the abdominal edge 3a of the blade portion 3 in the blade 1 of FIG. 1, but this dripping portion is scraped off by grinding for forming the back rake face 7a shown in FIG. As shown in FIG. 3, when the cutting edge 8 is formed on the abdominal edge 3a, the dripping portion does not remain, and good sharpness can be obtained.

In the above embodiment, the chamfer 6a with a small blade is provided over the entire area between the abdominal edge 3a and the back edge 3b of the blade portion 3. It may be provided.

Considering the above embodiment, it can be understood as the following technical idea. (A) In the first aspect, after the blade 1 is pressed, the blade 1 is barrel-polished, and then the back surface 7 of the blade portion 3 is scraped into a substantially flat shape to form a back rake face 7a.

[0015]

According to the method for manufacturing the blade of the scissors according to the present invention, since the press processing is used for forming the chamfer 6a with a small blade, the manufacturing process of the blade 1 can be simplified. For example, even if the blade 1 is subjected to barrel polishing, which has good work efficiency but easily causes a dripping portion, the dripping portion is shaved off by forming the back rake face 7a.
When the cutting edge 8 is formed on the cutting edge, this dripping portion does not remain, and good sharpness can be obtained.

[Brief description of the drawings]

FIG. 1A is a plan view showing a blade formed with a chamfer with a small blade in a method for manufacturing a blade of scissors according to the present embodiment, and FIG. 1B is a partially enlarged front view of FIG. (C) is an enlarged sectional view taken along line AA of (a).

FIG. 2 (a) is a bottom view showing the blade of FIG. 1 in which the back surface is polished into a flat surface to form a back surface, and FIG.
(A) is a partially enlarged front view of (a), and (c) is B of (a).
FIG. 4 is an enlarged cross-sectional view taken along line B.

FIG. 3 is an enlarged cross-sectional view showing the blade shown in FIG.

FIG. 4 is a plan view showing scissors using a blade according to the present embodiment.

FIG. 5 (a) is a plan view showing a blade before forming a bevel with a small blade in a conventional blade manufacturing method for scissors,
(B) is an enlarged sectional view taken along the line CC of (a), (c) is a plan view showing a blade having a chamfer with a small blade formed on the blade of (a), and (d) is a plan view of (c). (E) is an enlarged sectional view showing the blade shown in (c) and (d) with a cutting edge.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... blade, 3 ... blade part, 3a ... belly edge, 3b ... back edge, 6a ...
Chamfer for small blades, 7a ... Back face, 8 ... Cutting edge.

Claims (1)

(57) [Claims] 1. The blade (3) is pressed to bend the flank (3a) side of the blade (3) so that the blade (3) has a flank (3a) of the surface (6) at the blade (3). ) Side, a chamfer (6a) with a small blade is formed. Next, the back surface (7) of the blade portion (3) is scraped into a substantially flat shape to form a back rake surface (7a). (6) The thickness (T) between the upper chamfer with small blades (6a) and the back surface (7a) is made thinner from the back edge (3b) toward the abdominal edge (3a). And a cutting edge (8) formed on the abdominal edge (3a) of the chamfer (6a) with small blades.