JPH0543749Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention relates to a device that applies rotational resistance to the circular blade in a cutter that rotatably supports the circular blade.

(Prior Art) Conventionally, as this type of circular blade rotary cutter, there is one shown in, for example, Japanese Utility Model Application Publication No. 62-202271.

In this cutter, a pressure contact part is attached to the rotation center of the circular blade so as to be able to rotate integrally with the pressure contact part, and the pressure contact part is pressed against the pressure contact part of the circular blade in a direction parallel to the side surface of the circular blade that is orthogonal to the rotation center line of the circular blade. A pressing member is movably supported on the handle.

(Problem to be solved by the invention) However, in this prior art, when the pressing member is moved by the adjustment member, the amount of operation is converted into the amount of movement of the pressing member, so the rotational resistance of the circular blade is It was very difficult to make subtle adjustments.

That is, if the pressing member is even slightly separated from the pressing portion of the circular blade, the pressing force of the pressing member is not applied to the circular blade, resulting in a problem that the rotational resistance of the circular blade becomes too small. Further, since the operating force applied to the adjusting member is directly applied to the pressing member, there is a problem in that when a large operating force is applied to the pressing member, the rotational resistance of the circular blade becomes too large. Therefore, delicate adjustments could not be made.

The purpose of the present invention is to make it easier to finely adjust the rotational resistance of the circular blade by imparting elasticity to the pressing member.

Structure of the invention (means for solving the problem) The invention described in the first claim is a circular blade rotary cutter in which a circular blade 5 is rotatably supported on a handle 1, as shown in the drawings of both embodiments described later. , the circular blade 5 is substantially perpendicular to the rotation center line A of the circular blade 5.
Elastic pressing members 10, 16 are pressed against the pressing portion 6a of the circular blade 5 in a direction B substantially parallel to the side surface 5b of the
is movably supported relative to the handle 1, and the pressing members 10, 16 are moved against the elastic force so as to adjust the pressing force of the elastic pressing members 10, 16 against the pressing portion 6a of the circular blade 5. Adjustment members 13, 18
is attached to handle 1.

As shown in FIGS. 1 to 4 of the drawings of the embodiments described later, the device described in the second claim is the device described in the first claim, in which a spring is supported in a cantilever shape with respect to the handle 1. This is an elastic pressing member 10.

(Function) In the present invention described in each claim, a frictional force is applied to the circular blade 5 in a direction B substantially parallel to the side surface 5b of the circular blade 5, which is substantially orthogonal to the rotation center line A of the circular blade 5. Rotational resistance is applied, and the circular blade 5 no longer bends due to this frictional force.

In particular, by changing the amount of deformation of the elastic pressing members 10 and 16, the pressing force of the circular blade 5 to the pressing portion 6a can be changed.

(Embodiment) First, a first embodiment of the present invention will be described with reference to FIGS. 1 to 4.

The handle 1 consists of a grip part 2 and a blade attachment part 3 formed at its front end, and a blade support hole 4 is provided through the blade attachment part 3.

The circular blade 5 is rotatably supported by a nut 6 and a bolt 7 with respect to the blade attachment part 3. Natsuto 6
consists of a head part 6a (pressure contact part) and a neck part 6b, and this neck part 6b extends from one side of the blade mounting part 3 to the blade support hole 4.
The head 6a is inserted into the blade mounting portion 3, and the head 6a is locked to one side of the blade mounting portion 3. This neck portion 6b protrudes to the other side of the blade attachment portion 3, and the circular blade 5 is locked to the end surface of this neck portion 6b on the other side of the blade attachment portion 3, so that it can rotate together with the nut 6. A bolt 7 is screwed into a female threaded hole 8 formed in this nut 6, and a circular blade 5 is sandwiched between this bolt 7 and a neck portion 6b of the nut 6.

A protective member 9 is movably fitted between the circular blade 5 and the blade attachment part 3, and this protective member 9 has two positions: an unused position where the cutting edge 5a of the circular blade 5 is prevented from being exposed, and an unused position where the cutting edge 5a of the circular blade 5 is exposed. It is designed so that it can be used in a position that allows for

The head 6 of the nut 6 is mounted on one side of the blade attachment part 3.
A round bar-shaped spring 10 (elastic pressing member) is adjacent to a.
is supported like a cantilever at one end 10a, and the other end 10b of the spring 10 is supported by the head 6a of the nut 6.
It is designed to be able to bend to the side. A locking groove 11 is formed in the entire circumferential direction on the outer periphery of the head 6a of the nut 6, and the spring 10 is engaged in this locking groove 11.

A lid 12 is attached to one side of the blade attachment part 3,
An adjustment member 13 is rotatably supported on the lid 12. This adjustment member 13 consists of a knob portion 14 that protrudes to the outside of the lid 12 and a cam portion 15 formed inside the lid 12. The spring 10 can be pressed between the pressure contact portion of the spring 10 and the other end 10b of the spring 10.

When the spring 10 is pressed by the cam portion 15, the spring 10 bends against the elastic force and presses against the locking groove 11 of the head 6a of the nut 6. This pressing force acts in a direction B parallel to the side surface 5b of the circular blade 5, which is perpendicular to the rotation center line A of the circular blade 5. Therefore, a frictional force corresponding to this pressure contact force is applied between the spring 10 and the head 6a of the nut 6, thereby imparting rotational resistance to the circular blade 5.

When the rotational position of the knob part 14 of the adjusting member 13 is changed, the engagement position between the cam part 15 of the adjusting member 13 and the spring 10 changes, and thereby the amount of deflection, that is, the amount of deformation of the spring 10 changes, and the nut by the spring 10 changes. The pressing force of 6 to the head 6a is adjusted. By adjusting this pressure contact force, the rotational resistance of the circular blade 5 can be adjusted.

In this embodiment, the rotation center line A of the circular blade 5
Since the frictional force is applied in the direction B parallel to the side surface 5b of the circular blade 5, which is perpendicular to the circular blade 5, the circular blade 5 will not bend. Therefore, the object to be cut is not cut in a meandering manner, and the cutting can be performed accurately.

In particular, by changing the amount of deflection of the cantilever-shaped spring 10, the pressure force applied to the head 6a of the nut 6 is changed, so by adjusting the amount of deflection, the rotational resistance of the circular blade 5 can be subtly reduced. Can be adjusted.

The second embodiment shown in FIG. 5 is a modification of the first embodiment in that the means for imparting rotational resistance to the circular blade 5 is changed, and the elastic pressing member 16 is composed of a movable pressing portion 16a and a compression coil spring 16b. . The adjustment member 18 is a support portion 17 formed on the blade attachment portion 3.
The movable part 18a is movably supported by the support part 17, and the operation nut 18b is rotatably supported by the support part 17 and screwed into the movable part 18a. A compression coil spring 16b is interposed between the spring 16a and the spring 16a. The head 6a of the nut 6 located at the center of rotation of the circular blade 5 is pressed by a pressing portion 16 due to the elastic force of the compression coil spring 16b.
a is pressed against the circular blade 5, and rotational resistance is applied to the circular blade 5 by this pressing force.

When the operating nut 18b is rotated, the movable part 1
8a moves to change the length, that is, the amount of deformation, of the compression coil spring 16b, thereby changing the pressing force of the pressing portion 16a against the head 6a of the nut 6, so that the rotational resistance of the circular blade 5 can be adjusted. In this way, also in this embodiment, the compression coil spring 16
Since the amount of deformation of b, that is, the elastic force is changed, the rotational resistance of the circular blade 5 can be finely adjusted by adjusting this elastic force.

Effects of the invention According to the invention described in each claim, the object to be cut is not cut in a meandering manner, and not only can cutting be performed accurately, but also the amount of deformation of the elastic pressing members 10 and 16 can be reduced. Through adjustment, the rotational resistance of the circular blade 5 can be finely adjusted.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway rear view of a circular blade rotary cutter showing a rotational resistance imparting device according to a first embodiment of the present invention, and FIG. 2 is a circular blade rotary cutter showing the internal structure of the rotational resistance imparting device. 3 is an enlarged sectional view taken along the - line in FIG. 1, FIG. 4 is a partially cutaway front view of the circular blade rotary cutter showing the circular blade and protective member, and FIG. 5 is the rotation resistance. FIG. 7 is a partially cutaway rear view of a circular blade rotary cutter showing a second embodiment of the applicator. 1...Handle, 3...Blade mounting part, 5...Circular blade, 6
... Nut, 6a ... Head (pressing part), 9 ... Protective member, 10 ... Spring (elastic pressing member), 11 ...
...Latching groove, 13...Adjustment member, 15...Cam part,
16...Elastic pressing member, 16a...Pressing part, 16
b... Compression coil spring, 18... Adjustment member.

Claims (1)

[Claims for Utility Model Registration] 1. In a circular blade rotary cutter in which a circular blade 5 is rotatably supported on the handle 1, the cutter is substantially parallel to the side surface 5b of the circular blade 5, which is substantially orthogonal to the rotation center line A of the circular blade 5. elastic pressing members 10 and 16 that are pressed against the pressing portion 6a of the circular blade 5 in the direction B are movably supported with respect to the handle 1;
Adjustment members 13 and 18 are attached to the handle 1 to move the elastic pressing members 10 and 16 against the elastic force so as to adjust the pressing force of the elastic pressing members 10 and 16 against the pressing portion 6a of the circular blade 5. A rotational resistance imparting device for a circular blade rotary cutter, characterized by: 2. The rotational resistance imparting device for a circular blade rotary cutter according to claim 1, wherein the elastic pressing member 10 is a spring supported in a cantilever shape with respect to the handle 1.