JPS609466B2 - scissors - Google Patents

Description

[Detailed description of the invention] This invention relates to iron.

As shown in FIG. 1, in iron, a moving blade 4 consisting of a toga finger handle 5 and a blade 6 is supported on a shaft 7 so as to be openable and closable, while a stationary blade 1 consists of a ring finger handle 2 and a blade 3. The back of the blade 3a, 6 when cutting
A receives lateral pressure from the workpiece W that tries to push open the contact between the double blades 1 and 4.

When this lateral pressure increases, the workpiece W rotates and is not cut but is pinched. Therefore, a contact pressure corresponding to this lateral pressure is required for the iron to have a correct cutting action.
Therefore, as shown in Fig. 2, a hole S is provided in the iron blade backs 3a, 6a, and the elasticity of the double blades 1, 4 is used to obtain contact pressure at the cutting point Q. It forms a surface shape. Conventionally, as shown in FIGS. 2 and 3, the gap S is provided by bending the blade backs 3a and 6a together, aligning them, and slightly twisting them.

As the workpiece W is cut from the state shown in FIG. 1, the contact point P where the handles 2 and 5 intersect and the cutting point Q where the blades 3 and 6 intersect move away from each other.
As the cutting point Q moves from the state shown in FIG. 3, the double blades 1 and 4 try to approach the state shown in FIG.
is deformed so as to be stretched in a straight direction, and the elasticity caused by this deformation becomes contact pressure. In the above work, both blades 1 and 4 need to be warped to the same degree and twisted very slightly.
Moreover, if the warpage is too large, there is a risk that the two blades 1 and 4 will bite into each other and the blade will break, so it is very difficult to do so.It is very difficult for an expert to make fine adjustments one by one by listening to the sound of the two blades 1 and 4 closing. I was finishing it.

In addition, there is also a tool that does not form the above-mentioned warp and instead forms a convex portion near the shaft 7 of both handles 2 and 5 so that the engaging portions of both blades 1 and 4 are brought into pressure contact with each other. Since the double blades 1 and 4 were warped in the anti-meshing direction, there was a defect that the cutting ability deteriorated at an early stage.

Therefore, in the present invention, as shown in FIGS. 4 to 6, the warp is formed only in the blade hair 6a of the cutting edge 4, and the twist (downward direction in FIG. 4) is changed from the A position to the B position. It becomes larger toward the position, and the blade back 3a of the stationary blade 1 is made flat without forming the warp or twist.

Therefore, compared to the conventional iron in which both the blades 1 and 4 are warped, the iron of the present invention has a warp in only one of the blade diamonds 6a, so it is difficult to obtain the same contact pressure as the conventional iron. This has the effect of increasing the degree of warpage and making it much easier to adjust the amount of warpage.

Further, there is an effect that the polishing process of the flat blade back 3a can be easily automated.

[Brief explanation of drawings]

Figure 1 is a front view of the conventional iron in the open state, Figure 2 is a partially cutaway plan view of the conventional iron in the closed state, and Figure 3 is a double-edged iron in the state shown in Figure 1. FIG. 4 is a partially cutaway plan view of the iron of the present invention in the closed state, and FIG. The illustrated diagram, FIG. 6, is an explanatory diagram showing the twisted state of the iron of the present invention. Static blade...1, Back of the blade...3a, Moving blade...4,
Behind the blade.・・・． ...6a. Leopard 1 *2 Figure 3 Figure 4 Figure 5 Blinds 6

Claims (1)

[Claims] 1. The back side 6a of one of the openable and closable double blades 1 and 4.
A pair of scissors characterized in that the chisel is curved, and the back side 3a of the other blade 1 is formed flat. 2. The scissors according to claim 1, wherein a twist is also formed on the back side 6a of the curved blade 4.