JPH0723161Y2 - Tool for grinding scissors blade - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a tool for grinding a blade of scissors.

(Prior Art) Conventionally, the outer surface of scissors has been ground so as to have a flat surface mainly by using a grinding tool provided with a disk-shaped grindstone.
However, the blade body whose outer surface is ground flatly has a problem that the strength of the tapered tip portion is reduced and the sharpness is reduced.

(Problems to be solved by the invention) Therefore, in order to improve the strength of the tip portion of the blade body, to give a high-quality feel to the touch, and to improve the design, the outer shape line in the width direction of the outer surface of the blade body. Scissors with rounded edges were desired. In addition, in order to improve the strength of the tip of the blade in this way, the arc shape of the outer surface is twisted from the blade base to the blade tip.
It was desired that the ratio of "the thickness of the ridge (the back of the blade)" to "becomes larger toward the tip. The grinding of the blade body is performed manually by a craftsman who relies solely on his experience and intuition to use a plate-shaped grindstone.

That is, conventionally, various grindstones and grinding tools have been proposed, but the outer shape of the outer surface of the blade in the width direction is rounded, and the arc shape of the outer surface is twisted from the blade edge to the blade tip. There was no grinding wheel or tool suitable for mechanically grinding the blade.

The present invention has been made as a result of intensive studies by the present applicant in view of the above circumstances, and an object of the present invention is to provide a blade body having an outer shape in the width direction of the outer side surface of the blade body in an arc shape. There
Twist the arc shape of the outer surface from the blade edge to the blade edge,
Therefore, it is an object of the present invention to provide a grinding tool that can easily grind a blade body in which the ratio of the thickness of the crest to the width of the blade sliding surface increases toward the tip by a machine.

(Means for Solving the Problems) In order to achieve the above object, in the tool for grinding a scissor blade according to the first aspect of the present invention, a circular arc-shaped support member is used as the cylindrical opening. A support member with a narrow flange part protruding from the inner surface of the part, and an annular sticking to the inner peripheral surface of this flange part, so that the arc shape of the outer surface is twisted from the blade edge of the scissors to the blade edge. A whetstone for grinding,
The grindstone has a narrow inner peripheral surface for grinding the outer side surface to the twisted shape and a grindstone having a proper thickness, an opening end surface of the support member, an outer side surface of the flange portion, and a grindstone It is characterized by being flush with the outer edge.

Narrow width grindstone is thick, that is, if the distance between the outer circumference and the inner circumference of the circular ring is thick, it becomes a donut-shaped thin disk and easily cracks or cracks.Thus, the thickness of the grindstone in the above means Is thin enough to prevent such chipping and cracking.

Further, in the tool for grinding scissors blades according to the second aspect of the invention, a cylindrical connecting member connected to a processing machine such as a polishing machine and an opening end of the connecting member are detachably fixed. And a cylindrical support member, and a grindstone that is attached in an annular shape to the inner peripheral surface of the support member and grinds so as to twist the arc shape of the outer surface from the blade edge to the blade edge of the scissors. It is characterized by that.

(Operation) In order to grind the blade body so that the outer shape of the outer surface of the blade body in the width direction has an arc shape by the configuration according to the above-described claim 1, the grinding tool provided with this grindstone is rotated. Then, the blade body material or the grinding tool may be driven so that the blade body material relatively moves in the length direction while bringing the outer peripheral surface of the blade body material into contact with the inner peripheral surface thereof.

At this time, the fine grindstone prevents the grindstone from contacting the blade tip from the blade tip over a wide range, so that the arc shape of the outer surface can be sequentially changed from the blade tip to the blade tip to grind while twisting. That is, it is possible to perform a grinding method such that the ratio of the “thickness of the ridge (back of the blade) to the“ width of the blade sliding surface ”becomes larger toward the tip.

Further, since the outer circumference and the inner circumference of the annular shape are close to each other, that is, the thickness is appropriate, it is difficult for the grinding stone to be chipped or cracked even if the grinding stone has a narrow width.

Moreover, by projecting the flange portion, the inner diameter of the annular grindstone can be made smaller than the inner peripheral surface of the support member even if the grindstone is thin. Therefore, even with a thin grindstone, the grinding surface of the grindstone can be kept higher than the inner peripheral surface of the support member.

Further, since the outer surface of the grindstone is flush with the end surface of the opening of the support member, the operability is not reduced by being hindered by the opening as compared with the case where the grindstone is provided inside the support member.

When creating this grinding tool, the clay-like grindstone material before thermosetting is placed on the protruding portion of the flange portion, but since it has a protruding shape, it is easy to place it, and it is a circle with a thin width and an appropriate thickness. It is also suitable for forming into an annular shape, and is suitable for simultaneously heat-curing the grindstone and adhering it to the inner peripheral surface of the flange portion by subsequent high temperature firing.

Further, according to the configuration of claim 2, in order to grind the blade body so that the outer shape of the outer side surface of the blade body in the width direction has an arc shape,
The connecting member to which the support member is fixed is connected to a processing machine such as a grinder, and a grinding tool equipped with this grindstone is rotated to bring the outer peripheral surface of the blade material into contact with the inner peripheral surface of the blade material. The blade material or the grinding tool may be driven so that the blades move relative to each other in the length direction.

When grinding a long blade, remove the supporting member from the connecting member, fix another long connecting member, and then connect the connecting member to which this supporting member is fixed again to a processing machine such as a polishing machine. Good.

(Example) Next, an example of a tool for grinding a blade of scissors embodying the present invention will be described with reference to the drawings.

As shown in FIG. 1, FIG. 2 and FIG. 3, the grinding tool (10) of this embodiment comprises a cylindrical connecting member (20) connected to a processing machine such as a polishing machine, and the connecting member. A cylindrical support member (30) removably fixed to the open end of (20), and a grindstone (40) attached in an annular shape to the inner peripheral surface of the support member (30). ing.

And, this grindstone (40) has an inner peripheral surface having a predetermined width,
The metal support member (30) is attached to the inner peripheral surface of a flange portion (31) projecting from the inner surface of the opening. Whetstone (4
0) is appropriately selected such as zirconia abrasive grains, cubic boron nitride abrasive grains, or diamond abrasive grains as a main component.

The support member (30) is detachably fixed to the open end of the cylindrical connecting member (20) with a bolt (32). The connecting member (20) is connected to a processing machine such as a polishing machine by a screw hole (23) provided in the bottom portion (22).

Also, when making this grinding tool, clay-like grindstone material before thermosetting is put on the protruding part of the flange part and molded, and then by high temperature firing, the grindstone is thermoset and adhered to the inner peripheral surface of the flange part. At the same time. Since the support member can be removed, it is possible to bake the support member together. At that time, the protrusion shape of the flange portion makes it easy to deposit the grindstone material, and is suitable for forming an annular shape having a narrow width and an appropriate thickness. Regarding this point, I made a grindstone first,
If it is adhered after that, the thin grindstone is easily broken and the adhesion is difficult, but such a problem can be solved.

In addition, in this embodiment, the width of the inner peripheral surface of the grindstone (40) is 5 mm.
Although it is thin, the grindstone (40) has a suitable thickness of 3 mm, so it will not easily chip. The inner diameter of this grindstone (40) is 70mm, and the grindstone (4
The length from the outer end surface of (0) to the inner surface of the bottom portion (22) of the connecting member (20) is 85 mm. The length from the outer end surface of the grindstone (40) to the inner surface of the bottom portion (22) of the connecting member (20) is different from that of the connecting member (20) having a different length according to the length of the blade material of the scissors to be ground. It will be changed as appropriate by exchanging.

Next, the operation of the grinding tool (10) will be described according to the procedure for grinding the blade material (51) of the scissors (50) shown in FIG.

First, the cylindrical support member (30) to which the grindstone (40) is adhered is fixed to the connecting member (20) with the bolt (32), and the bottom portion (22) of the connecting member (20) is ground. Connect to the rotating shaft of processing machines such as machines. Then, the grindstone (40) is rotationally driven in the axial direction.

On the other hand, the blade material (51) before being ground is fixed to an elongated processing table (60). Then, as shown in FIG. 2, the machining base (6) of the blade material (51) is so arranged that the blade material (51) inclines in the width direction and relatively moves in the length direction as shown in FIG.
1) Alternatively, the outer surface (F) of the blade material (51) is brought into contact with the inner circumference of the grindstone (40) while controlling and driving the grinding tool (10).

At that time, since the outer end surface of the grindstone is flush with the end surface of the opening of the support member or the like, even when the blade material (51) is brought into contact with the grindstone, the position can be easily confirmed without being obstructed by the opening. Also, it becomes easy to spray water on the ground.

By doing the above, the outer shape of the outer side surface (F) in the width direction has an arc shape, and grinding can be performed while sequentially changing the center of the arc of the outer side surface from the blade base to the cutting edge, that is, the "blade body sliding surface". It is possible to provide a ground blade body (52) such that the ratio of the "thickness (the back of the blade body)" to the "width" of the blade becomes larger toward the tip.

The cross-sectional shape of the blade body (52) of the scissors (50) will be described in more detail. The cross section of the base end portion (line AA in FIG. 4) of the blade body (52) is shown in FIGS. 5 and 6. As shown in, the shape has points a, b, and c. Then, the cross section of the tip portion of the blade body (line BB in FIG. 4) has a shape consisting of points b, e, and f (the blade body shape shown by the solid line in FIG. 6).
If the blade body material (51) is not tilted in its width direction but is driven straight in the length direction and the outer surface of the blade body (52) is not ground into a spiral shape twisted in the length direction, the blade body (52) As shown in FIG. 5, the cross section of the tip end of is a thin shape consisting of points a, e, and f (the blade shape shown by the chain line in FIG. 6).

Therefore, in the grinding tool (10) including the grindstone (40), the scissors (50) including the blade body (52) ground into the complicated shape can be easily manufactured by machining. . Further, unlike the manual grinding, the blade material (51) is precisely machined, so that it is not necessary to re-grind the cutting edge later, and the blade body (52) can quickly and sharply cut. ) Can be manufactured.
Further, in the scissors (50) including the blade body (52) ground by the grinding tool (10) including the grindstone (40), the outer shape (F) of the blade body (52) in the width direction. Since the line has an arc shape, the strength of the tip portion is maintained high, the elasticity is improved, and the sharpness is excellent. According to this whetstone (40), it is also possible to provide scissors having a ceramic blade that is brittle and easily broken. Further, the scissors (50) including the blade body (52) ground by the grinding tool (10) not only has an excellent feel to the touch, but also have an improved design.

Further, the supporting member (30) is removed from the connecting member (20) according to the length of the blade material (51) to be ground, and the supporting member (30) is bolted to another long connecting member (20). If fixed by, the blade body materials (51) having different lengths can be ground.

The invention is not limited to the above embodiment,
The grinding stone (40) is attached to the inner peripheral surface of the opening of the support member (30) integrally provided with the connecting member (20), or the grinding stone (40) is used.
The cross-sectional shape and the like may be appropriately changed and implemented without departing from the spirit of the present invention.

Further, this grinding tool may be used when grinding the outer surface of the blade with a grindstone without making the outer surface into a spiral shape.

(Effects of the Invention) As described in detail above, in the scissors grinding tool of the invention described in claim 1, the ratio of the thickness of the ridge to the width of the sliding surface of the blade body is increased toward the tip. That is, it is possible to grind while twisting the arc shape of the outer side surface from the blade edge to the blade edge. Therefore, there is an excellent effect that scissors including a blade having a complicated shape excellent in strength and sharpness can be easily manufactured by machining.

And such grinding is possible because the grindstone is thin, and it is difficult to chip due to the appropriate thickness.Even with such an annular shape, it is easy to form with the narrow flange part that is protrudingly formed. A grindstone can be attached by firing.

Further, in the scissors grinding tool of the invention as set forth in claim 2, by removing the support member from the connecting member according to the length of the blade material to be ground, and fixing the supporting member to another long connecting member. The excellent effect that blade materials having different lengths can be ground is obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a tool for grinding a scissors blade body embodying the present invention and a blade material, and FIG. 2 is a front view of a grinding tool for grinding a scissors blade body material. Fig. 3 is a sectional view of a tool for grinding a scissor blade, Fig. 4 is a plan view of scissors having a blade ground by this grinding tool, and Fig. 5 is a sectional view of a different part of the blade. FIG. 6 is an enlarged cross-sectional view of the blade body showing comparative sectional shapes, and FIG. 6 is an enlarged cross-sectional view of the blade body taken along the line BB in FIG. Explanation of code 10 …… Tool for grinding scissors blade, 20 …… Coupling member, 30 ……
Support member, 40 …… Whetstone, 50 …… Scissors, 51 …… Blade material, 52
…… Blade, F …… Outside surface.

Claims (2)

[Scope of utility model registration request] 1. A support member having a cylindrical shape, the support member having a narrow flange portion projectingly formed on the inner surface of the cylindrical opening portion, and a ring-shaped attachment member on the inner peripheral surface of the flange portion. A grindstone worn to grind the circular arc shape of the outer surface from the blade edge of the scissors to the blade edge, and the grindstone is suitable as a narrow inner peripheral surface for grinding the outer surface into the twisted shape. A grinding tool for a scissors blade, characterized by comprising: a thin grindstone, wherein an end surface of the opening of the support member, an outer surface of the flange portion, and an outer end surface of the grindstone are flush with each other. . 2. A cylindrical connecting member connected to a processing machine such as a polishing machine, a cylindrical supporting member detachably fixed to an opening end of the connecting member, and an inner peripheral surface of the supporting member. On the other hand, a tool for grinding a scissor blade body, which is equipped with a grindstone that is attached in an annular shape and that grinds so as to twist the arc shape of the outer surface from the blade edge to the blade edge.