JPS5811528Y2 - Rotary cutter for boring - Google Patents

Description

[Detailed description of the invention] This invention relates to a rotary cutter for boring in woodworking.

Conventionally, boring of bowls has generally been done by hand using a potter's wheel, which has the disadvantage of being inefficient and requiring sufficient skill.

Therefore, in order to automate this process, a single upright rotary blade 4' has been devised in which the workpiece is fixed and blades 5', 5' are provided on both sides as shown in Fig. 5. Due to its structure, it is difficult to make the blade angle acute, so the cutting resistance is large and the cutting quality is poor.In addition, the load on the cutting edge is large because the entire inner peripheral surface of the workpiece material is cut at the same time. Since it is difficult to discharge the cutting waste, the cutting waste tends to get stuck at the bottom of the blade, making it impractical.

On the other hand, this invention has a structure in which the cutting chips are naturally directed upward so that they can be easily discharged to the outside of the blade body.
In the figures and FIG. 2, reference numeral 1 denotes a mounting plate formed in the form of a ring-shaped disc, whose upper surface can be superimposed and fixed on a predetermined rotating shaft 2.

As shown in FIG. 2, this mounting plate 1 usually has a cylindrical rotary shaft fitting tube 3 attached to its upper surface.

Next, reference numeral 4, 4 denotes a split blade body whose upper edge is fixed to the lower surface of the mounting plate 1 and is integrally formed, and is a circular container, that is, a hemispherical container body that fits the required concave cutting surface to be cut. It is made by dividing it vertically into four equal parts through the center and combining the two opposing parts.

And several blade metals 5 are placed on each side edge of the outer surface.
・are planted in a row along the side edges.

This divided blade body 4.4 is attached to the mounting plate 1 with screws 6 and is removable for convenient purposes such as polishing the blade 5.

The shape of the divided blade bodies 4, 4 can be made into any shape such as an inverted conical shape or a stepped hemispherical shape as shown in FIGS. 3A and 3B depending on the shape of the recessed hole to be cut. 6... can also be removed and replaced with the mounting plate 1.

With the above-mentioned structure, this invention allows the mounting plate 1 to be fixed to the rotating shaft 2 and rotated, and to cut the required recesses on the wood surface through the blades 5. The cutting waste that comes out in the form of small pieces from the blade 5 divided into several parts enters the inside between the two divided blade bodies 4, 4, and is Since the rotary blade is rolled up by the centripetal force caused by rotation and discharged to the outside, there is no fear that the rotary blade body becomes a stirring blade for the cutting waste, unlike the conventional blade shown in FIG. 5.

Note that it is even more effective to use a hollow shaft as the rotating shaft 2 and vacuum suction from above.

FIG. 4 shows a modification of FIG. 1, in which each part is designated by the same reference numeral as in FIG.

In this case, one side edge of the divided blade bodies 4, 4 is formed in a spiral shape to improve the contact between the blades and to increase the force for hoisting up the cutting material.

[Brief explanation of the drawing]

Figure 1A is a cross-sectional side view of this device, Figure B is a view from below, Figure 2 is an exploded perspective view of each part, and Figure 3A.
, B are views showing each side of the cross-sectional shape, FIGS. 4A and B are cross-sectional side views and bottom views showing modifications of FIG. 1, and FIG.
The figure is a perspective view showing an example of a conventional device. Codes in the diagram: 1 is the mounting plate, 2 is the rotating shaft, 4 is the split blade body,
5 indicates a blade, and 6 indicates a screw.

Claims (1)

[Scope of utility model registration request] On the lower surface of a ring-shaped mounting plate 1 whose upper surface overlaps and is fastened to the tip of a predetermined rotating shaft, a circular container that fits the required cutting surface is vertically divided into approximately four equal parts, and two of these are placed facing each other. A set of two divided blade bodies 4 having a shape in which one part is left and the other part is removed, and several blade parts 5 are implanted on each side edge.
, 4 are removably fixed and integrated into a rotary cutter for boring.