JPH062191B2 - Method for manufacturing blade of pinking scissors - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a blade of pinking scissors.

[Prior Art] Conventionally, when manufacturing a blade body of this type of pinking scissors, in order to form a concave-convex cutting blade that is substantially perpendicular to the blade body, one side edge of the blade body is hobbed. With a blade,
Alternatively, one edge of a flat thin steel plate is punched out from above by a sawtooth shape and then the edge is bent so as to be substantially perpendicular to the blade body.

[Problems to be Solved by the Invention]

However, in the former method, there is a problem that it takes time to cut a tooth by a hob and inevitably increases the manufacturing cost of the blade of the pinking scissors, while in the latter method, the sliding contact surfaces of both cutting blades are Since the scissors collide when opening and closing the scissors, the smooth opening and closing operation of the pinking scissors cannot be guaranteed.

The present invention has been made in view of such problems, and an object thereof is to make it possible to manufacture a blade body of pinking scissors that ensures a smooth opening / closing operation at low cost.

[Means for Solving the Problems]

In order to achieve the above object, a method for manufacturing a blade of pinking scissors according to the present invention comprises bending a plate material into an acute angle to form a blade body and a bent portion, and then, the tip of the bent portion. The edge is punched in a direction along the body of the blade to form an uneven cutting blade, and then the blade body is bent again so that the bent body and the bent portion form a substantially right angle.

[Operation] The pressing operation of the blade body in the direction along the blade body can be easily performed without the blade body interfering with the pressing operation. As a result, a cutting blade parallel to the blade body is formed. Then, the bent portion is bent again toward the blade body side, so that the cutting blade is inclined with respect to the blade body.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, the pair of blades 1 are overlapped with each other with the spacer 2 sandwiched therebetween, and are supported by the support shaft 3 together with the spacer 2 so as to be rotatable relative to each other. In addition,
Each of these blades 1 has a thickness of about 1 mm.

As shown in FIG. 2, an outer handle 4 is fixed to the both blades 1 from the outside, and the blade 1 is fitted in a recess 4 a formed in the outer handle 4. An inner handle 5 is attached to the base end of both blades 1 from the opposite side of the outer handle 4, and the bases of both blades 1 are sandwiched between the outer and inner handles 4, 5. At the same time, the handle portions 4 and 5 are integrally welded by high-frequency welding to function as a handle.

As shown in FIGS. 1 and 2, the side portion of the blade 1 is bent at a substantially right angle, and the bent portion is used as a bent portion 1b with respect to the blade body 1a. Zigzag-shaped cutting blades 6 in which peaks and valleys are alternately continuous are formed on both bent portions 1b, and the respective slopes of these cutting blades 6 that slide with each other as the scissors open and close serve as sliding contact surfaces 7. ing. Both cutting blades 6 sequentially mesh with each other from the side of the spindle 3 as the blade body 1 is closed.

As shown in FIG. 1, each sliding contact surface 7 of the cutting blade 6 is inclined at an angle of α ° so that the height of the cutting blade 6 decreases from the inner side 6a to the outer side 6b in the opening / closing direction of the blade body 1. It forms a sloping plane.

Next, a procedure for manufacturing the above-mentioned scissors will be described.

As shown in FIGS. 3 (a) and 3 (b), a plate material P, the outer shape of which has been punched by a press in advance, is bent so as to form an L-shaped cross section with an acute angle β °, and the blade body 1a and the bent portion are formed. 1b and.

Next, as shown in FIGS. 4 (a) and 4 (b), the tip edge of the bent portion 1b is pressed from the direction of the arrow X along the blade body 1a and punched in a zigzag shape. As a result, the zigzag cutting blade 6 is formed on the bent portion 1b.

Further, as shown in FIGS. 5 (a) and 5 (b), when the plate material P is bent again so that the blade body 1a and the bent portion 1b are at a substantially right angle γ °, one blade body 1 Complete. This allows
The sliding contact surface 7 of the cutting blade 6 is not only inclined to form the above-mentioned zigzag shape, but is also orthogonal to it.
The cutting blade 6 is inclined toward the side a, that is, from the inner side 6a to the outer side 6b in the opening / closing direction of the blade 1 at an angle of α °. This α ° is an angle obtained by subtracting γ ° by the second bending from β ° by the first bending. Therefore, α ° and γ ° can be set to arbitrary angles by appropriately changing the angle of β °. In the manufacturing procedure of this embodiment, the angle α ° is set to 10 °, and the angle γ ° is set to 95 °.
The angle of ° is set to 105 °.

The other blade body 1 has a cutting blade 6 with respect to the blade body 1.
The unevenness of is shifted by a half pitch in the continuous direction and is made in the same manner as described above.

After that, the double-edged body 1 is quenched.

Next, as shown in FIG. 2, these blade bodies 1 are assembled by the support shaft 3 with the spacer 2 interposed therebetween.
In this state, both blades 1 can be opened and closed.

Then, after lapping and cleaning the both blades 1, the outer handle portion 4 and the inner handle portion 5 are attached, respectively, and the scissors are completed.

Next, the operation of the cutting blade 6 in the scissors manufactured as described above will be described.

As described above, since the sliding contact surfaces 7 of the cutting blade 6 in the scissors of this embodiment are inclined in the directions away from each other at the angle of α °, as shown in FIG. A pair of lines F1 at which the pair of sliding contact surfaces 7 forming the V and the surface F on which the mating cutting blade 6 that engages with the cutting blade 6 move are angled from the inside 6a to the outside 6b of the cutting blade 6. Expanded at θ °. That is, the valley V of the cutting edge 6 can be regarded as a shape that widens from the inner side 6a to the outer side 6b at an angle θ. On the other hand, if the sliding contact surface 7 is not inclined in this way, as shown in FIG. 7, a pair of lines formed by the pair of sliding contact surfaces 7 and the moving surface F intersecting each other. F2
Remain parallel to each other without any divergence.

When the scissors of the present embodiment shown in FIG. 6 are operated in the closing direction, as shown in FIGS.
With respect to the valley V of the cutting edge 6, the crest of the cutting edge 6 on the other side moves in an arc shape around the support shaft 3 as shown by the arrow, but the valley V of the cutting edge 6 expands toward the outer side 6b, that is, Since the two cutting blades 6 run away from each other, the movement of both cutting blades 6 is not hindered. Therefore, the scissors can be opened and closed without the sliding contact surfaces 7 colliding with each other. On the other hand, when the scissors having the sliding contact surface 7 shown in FIG. 7 are to be operated in the closing direction, the sliding contact surfaces 7 collide with each other as shown by the phantom line S in FIG. It cannot be opened or closed.

As described above, the pinking scissors of the present embodiment can perform a simple operation of punching and bending the cutting blade 6 with a press so that the sliding contact surfaces 7 of the cutting blade 6 do not collide with each other as described above. . Therefore, it is not necessary to form the cutting edge by a laborious work such as the conventional hobbing.

Further, according to the manufacturing method of the blade body 1 of the present embodiment, as described above, pressing is performed in the direction along the blade body 1a in a state in which the blade body 1 is bent in an obtuse angle shape. As shown in, the blade body 1a does not interfere with the movement path Y of the press indicated by the phantom line as in the case where the blade body 1a is pressed at an angle, and this work is performed. There is also an advantage that it is easy to perform.

On the other hand, when the scissors are opened and closed, as shown in FIG. 8, among the pair of sliding contact surfaces 7 forming the valleys V of the respective cutting blades 6, the sliding contact surface 7 near the support shaft 3 has a corner on the inner side 6a. Only the portion 7a is in sliding contact with the sliding contact surface of the other cutting edge, and the other sliding contact surface 7 is in substantially sliding contact with the sliding contact surface of the other cutting blade. This also applies to the pair of sliding contact surfaces 7 of the opposite cutting blade 6.
Therefore, a pair of sliding contact surfaces 7 of the two blade bodies 1 that are in sliding contact with each other.
One of the corners 7a is in sliding contact with the entire surface of the other.

Since each sliding contact surface 7 repeats the sliding contact as described above with the opening and closing of the scissors, at the time of the lapping, a set of sliding contact surfaces 7 is formed.
Only one of the corners 7a is easily polished. On the other hand, since the sliding contact surface of the cutting blade formed by the hob has an arc shape that follows the locus when the scissors are opened and closed, it is necessary to wrap the entire sliding contact surface. Therefore, the scissors by the hob require about 400 opening / closing operations at the time of lapping, whereas the scissors of the present embodiment can complete the rubbing with a small number of opening / closing operations of about 200 times.

Furthermore, in order to form a cutting edge with a hob, the blade must have a certain thickness to resist the cutting resistance, which increases the material cost of the blade and requires a long time for lapping. To do However, since the blade body 1 of this embodiment forms the cutting blade 6 by pressing as described above,
It can be made of thin and inexpensive material, and can be lapped in a short time.

In the pinking scissors of this embodiment, if the sliding contact surface 7 of the cutting blade 6 is inclined so that the height of the cutting blade 6 becomes lower from the inner side 6a to the outer side 6b in the opening / closing direction of the scissors. So good
For example, a corrugated cutting blade having continuous arcs may be used.

Further, in the present embodiment, the thickness of the blade 1 is set to about 1 mm,
This thickness may be about 0.8 to 1.5 mm.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to manufacture the blade body of the pinking scissors that ensures a smooth opening / closing operation at low cost.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a cutting blade of the pinking scissors of this embodiment, FIG. 2 is an exploded perspective view of the pinking scissors, and FIG.
FIG. 3 (a) is a sectional view showing a state in which a plate material is bent at an obtuse angle, FIG.
(b) is a reduced side view thereof, FIG. 4 (a) is a sectional view showing a state in which a cutting blade is punched by a press, FIG. 4 (b) is a reduced side view thereof, and FIG. 5 (a) is a plate material. Sectional view showing a state of being bent at a right angle, FIG. 5 (b) is a reduced side view thereof, and FIG. 6 is an explanatory view showing that the valley of the cutting edge expands when the sliding contact surface is inclined, FIG. 7 is an explanatory view showing a case where the sliding contact surface is not tilted, FIG. 8 is an explanatory view showing a movement locus of the ridge of the other side cutting blade with respect to the valley of the cutting blade, and FIG. 9 is a double-edged blade when closing the blade body. FIG. 10 is a cross-sectional view showing the positional relationship of the bodies, FIG. 10 is a cross-sectional view showing the closed blade bodies, and FIG. 11 is a cross-sectional view showing the relationship between the inclination angle of the sliding contact surface and the blade body. Blade 1, blade body 1a, bent portion 1b, handle 4 (outer handle), handle 5 (inner handle), cutting blade 6.

Claims (1)

[Claims] 1. A blade body (1a) formed by bending a plate material (P) into an obtuse angle shape.
And a bent portion (1b) are formed, and then the tip edge of the bent portion (1b) is punched with a press in a direction (X) along the blade body (1a) to form an uneven cutting blade ( A method for manufacturing a blade of pinking scissors, which comprises forming 6) and then bending the blade body (1a) and the bent portion (1b) again at a substantially right angle.