JPH0134761B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a rotary cutter for cutting a joint, which has a large number of cutting edges on its outer peripheral surface and is used to cut multi-stage wood joints such as sickle joints and dovetail joints.

In addition, the "rotary cutter for cutting joints" will be abbreviated as "cutter" below.

As a traditional joint in the field of wooden construction,
For example, a shape as shown in FIG. 1 has been used since ancient times. Figures a and b are both the foundations of houses;
These are male (a) and female (b) of kamatsugi used for girders, purlins, etc., and male (c) and female (d) of dovetail. Traditionally, the male (a) and female (b) of these kamatsugi and the male (c) and female (d) of anttsugi are:
As shown in Figure 2, they were cut using special cutters for males and females, respectively. That is, in FIG. 2a, the sickle male cutter C1 has a small diameter cylindrical straight blade part 1 at the head, a large diameter cylindrical straight blade part 2 at the middle part,
On the other hand, the sickle scalpel cutter C2 has a small diameter truncated conical diagonal blade part 4 at the head, and a small diameter cylindrical straight blade part 5 at the middle part.
and a large-diameter cylindrical straight blade portion 6 at the base, and the continuous blade portions 1, 2, and 3 as blade bodies, as well as the blade portions 4, 5, and 6, each have the same rotation axis P0. Of course, the side contour line M1 of the cutter C1, that is, the contour line representing the cross-sectional contour shape when cut along the plane passing through the axis P0 of the cutter C1 (hereinafter referred to as the "cross-sectional contour line"), The shape of the line representing the portion Q1 to Q2 representing the outer circumferential surface of the continuous blade portions 1, 2, and 3 on which the cutting edges are provided and which contacts the workpiece W for joint cutting, and the shape of the line representing the portion Q1 to Q2 of the cutter C2. side contour line M2,
That is, as in the cutter C1, its Q
The shape of the line representing 3 to Q4 is exactly 180 degrees rotated. That is, the side contour lines M1 and M2 are shaped to overlap each other if either one of them is rotated by two right angles.

In this way, since there is a phase difference of two right angles between the side contours M1 and M2 of the cutters C1 and C2, the overall shapes of the cutters C1 and C2 are different from each other. Next, in Figure 2b,
The cutter C3 exclusively for male ants consists of a small-diameter cylindrical straight blade part 7 at the head and a large-diameter inverted truncated conical diagonal blade part 8 at the base, while the cutter C4 exclusively for female ants consists of a small-diameter inverted truncated conical head part 8. It consists of an oblique blade part 9 and a large-diameter cylindrical straight blade part 10 at the base, and the continuous blade parts 7 and 8 as blade bodies and the blade parts 9 and 10 have the same rotation axis P0, respectively. And the side contour lines M3 and M of these cutters C3 and C4, respectively.
4, there is a phase difference of two right angles, similar to the relationship between the side contour lines M1 and M2. Therefore, the overall shapes of the cutters C3 and C4 are also different from each other. In addition, P is cutter C1, C2, C
3 and C4, showing the rotation shafts extending from the bases 3, 6, 8, and 10, respectively.

As mentioned above, conventionally, when cutting joints such as sickle joints and dovetail joints, a cutter exclusively for the male part is used for the male part of the joint, and a cutter exclusively for the female part is used for the female part. Since this was necessary, the work efficiency was extremely poor, and this was one of the factors that hindered the rationalization of joint processing.

In view of the above-mentioned defects, the present invention provides a rotary cutter for cutting a joint, which can cut each of the male and female parts of a multi-stage joint with a single cutter.

An embodiment embodying the technical idea of the present invention will be described below with reference to the drawings. Note that the same parts as in FIG. 2 are given the same reference numerals.

In FIG. 3a, C5 indicates a rotary cutter for cutting the sickle joint, and this cutter C5 has a small diameter cylindrical straight blade part 11 at the head, a large diameter cylindrical straight blade part 12 at the middle front part, and a middle rear part. It consists of a small diameter cylindrical straight blade part 13 and a large diameter cylindrical straight blade part 14 at the base, and each blade part 1
1, 12, 13, and 14 have the same rotation axis P0. The continuous blade portions 11, 12, 13, 14 of the cross-sectional contour of the cutter C5
The parts Q5 to Q6 represent the outer circumferential surface provided with cutting edges and come into contact with the workpiece W for joint cutting.
The shape of the side contour line M5 representing the same side contour line M5 is 180 degrees on a plane that includes the point O1 and passes through the axis P0, centering on the midpoint O1 that bisects the length of the same side contour line M5.
It is formed symmetrically with respect to the point O1 so that it has the same shape as when rotated by a degree.

Next, in FIG. 3b, C6 indicates a rotary cutter for dovetail cutting, and this cutter C6 has a small diameter cylindrical straight blade part 15 at the head and a large diameter inverted truncated conical diagonal blade part 16 at the middle part. , large diameter cylindrical straight blade part 17 at the base
The blade portions 15, 16, and 17 have the same rotation axis P0. The side contour line M6 is point symmetrical with respect to the midpoint O2 that equally divides the entire length of the same side contour line M6 into two, as in the case of the side contour line M5 of the cutter C5. That is, the side contour lines M6 also have a shape that overlaps each other if rotated at two right angles about the point O2.

When male and female kamatsugi and dovetail joints are respectively cut using the cutters C5 and C6 configured as described above, male (E) and female kamatsugi as shown in Fig. 4 a and b are obtained. (F) and male (G) and female (C) ants are engraved in relief and intaglio. That is, the side contour lines M5 and M6 of the cutters C5 and C6 are formed to be point symmetrical with respect to the points O1 and O2 that equally divide the entire length of the same side contour lines M5 and M6. ,C
Of the lines representing the planar contours of the male sickle (E) and the male dovetail (G) engraved by 6, the contour shape of the side surface portion that was in contact with the cutters C5, C6 during cutting is the same as that of the cutters C5, C6. Side contour line M5, M of C6
6 is the same as the shape obtained by moving two orthogonal rotations, and on the other hand, the contour shapes of the sickle scalpel (F) and dovetail knife (J) carved by the same cutters C5 and C6 are naturally the same as those of the same cutter C5. , C6 (see FIGS. 3a and 3b).

Therefore, the sickle male (E) and female (H) and the ant male (G) and female cut by one cutter C5 and C6.
(H) match each other and can be fitted. However, the sickle male cut by these cutters C5 and C6
(E)/Female (F) and male (G)/female (C) ants are shown in Figure 1a.
，
Traditional sickle female (a), female (b) and ant male shown in b
The shape is slightly different from (c) and female (d).

Figures 5a and 5b show another embodiment of the present invention, in which the cutters C7 and C8 are so-called
5, C6 two-stage type. Therefore, also in these cutters C5 and C6, the side contour lines M7 and M
8 is point symmetrical with respect to intermediate points O3 and O4, so one cutter can cut both male and female sickles and male and female ants. The same applies to a three-stage rotary cutter.

Furthermore, the present invention is not limited to the above embodiments,
For example, in order to cut a joint of a special shape, a cutter of a special shape having a curved surface part may be used.
However, even in this case, the side contour line representing the outer peripheral surface portion of the cutter where the cutting edge is provided and which comes into contact with the workpiece W for joint cutting is the same side adjacent contour line. Point symmetry is required at the point that bisects the length of the line.

In this way, the cutter according to the present invention eliminates the need to prepare two cutters, one for male use and the other for female use, as in the past, and can be used for the foundations, girders, main buildings, etc. of houses with a single cutter. It is possible to cut both the male and female parts of a joint formed in multiple stages, such as the one shown in the figure, and it goes without saying that the work efficiency is improved. There is no misfit between male and female due to dimensional changes due to correction polishing.

[Brief explanation of drawings]

Figures 1 a and b show a traditional sickle joint and dovetail joint, and Figures 2 a and b illustrate the side view and cutting state of a conventional rotary cutter for cutting the sickle joint and dovetail joint. It is a diagram. FIGS. 3a and 3b are diagrams explaining the side surface and cutting state of a rotary cutter for cutting sickle joints and dovetail joints, which is an embodiment of the present invention, and FIGS. It is a figure which shows the sickle joint and the dovetail joint which were cut. FIGS. 5a and 5b are diagrams showing a cutter according to another embodiment of the present invention. Cutters...C5, C6, C7, C8, Side contour line...M5, M6, M7, M8, Point that divides the length of the side contour line into two equal parts...O1, O2, O3, O
4. Rotation axis...P, Rotation axis...P0, Work material...
...W, blade body...11, 12, 13, 14, 1
5, 16, 17, the contact area between the cutting edge and the work material...
Q5-Q6.

Claims (1)

[Claims] 1. Blades 11, 12, 13 in the shape of a rotating body, such as a cylindrical shape or a truncated cone shape, with a large number of cutting edges on the outer peripheral surface.
14, 15, 16, 17 are the respective rotational axes P
0 is the same with respect to the rotation axis P.
In the multi-stage joint cutting rotary cutters C5, C6, C7, and C8, which are continuously formed in the 0 direction, the multi-stage joint cutting rotary cutters C5, C
The continuous blade bodies 11, 12, 13, 14, 1 among the contour lines representing the cross-sectional contour shape when cut along the plane passing through the axis P0 of 6, C7, and C8.
Side contour lines M5, M6, M representing portions Q5 to Q6 that represent the outer peripheral surface provided with cutting edges No. 5, 16, and 17 and that contact the workpiece W for joint cutting.
Points O1, O2, which divide the length of the side contour lines M5, M6, M7, M8 into two equal parts for the shape of 7, M8 on either the left or right side contour lines M5, M6, M7, M8, Point O centering on O3 and O4
1. Formed point-symmetrically with respect to the points O1, O2, O3, and O4 so that the shape is the same as when rotated 180 degrees on a plane that includes O2, O3, and O4 and passes through the axis P0. Rotary cutter for cutting joints.