JPH0957702A - Rotary tool attaching mechanism for cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a defective cut face caused by the eccentricity of a rotary tool from being generated, and improve the accuracy of cutting, and at the same time, reduce generation of vibration and abnormal sound in the main body of a cutter. SOLUTION: An elastic collar 11 of belleville spring form is provided between two flanges 10, 12, then a circular saw 9 is retained by the collar 11, and a bolt 13 is tightened. Consequently, the collar 11 is pressed by the flanges 10, 12 and is expanded to the outer periphery. Then the circular saw 9 is pushed to the outer periphery so that the center of the circular saw 9 coincides with the center of a drive shaft 8 to rotate the circular saw 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary tool mounting mechanism for aligning a center of a rotary shaft with a rotary shaft for transmitting power from a motor shaft.

[0002]

2. Description of the Related Art A rotary tool mounting portion of a conventional cutting machine using a rotary tool will be described with reference to FIGS. In order to attach the circular saw 9 to the main body, 2 of the flanges 10 and 12
One flange 10 is provided with a boss portion 10a for holding the circular saw 9. The flange 10 provided with the boss portion 10a is fitted to the drive shaft 8, the circular saw 9 is supported by the boss portion 10a, the remaining flange 12 is fitted to the drive shaft 8, and the bolt 13 is tightened to tighten the circular saw. This 9 was fixed and attached.

[0003]

The rotary tool mounting portion of this type has a gap between the outer diameter of the boss portion 10a of the flange 10 and the inner diameter of the circular saw 9 for facilitating attachment and detachment of the circular saw 9. 1
4 are provided. When the circular saw 9 is attached, the center of the circular saw 9 deviates from the center of the drive shaft 8 due to the gap 14. When the circular saw 9 is fixed in this state, the circular saw 9 is rotated while being eccentric. When the material 15 to be cut is cut in this state, the cutting surface 14a of the material 15 to be cut has streaks that are scratched by the circular saw 9, and the cut surface and the cutting accuracy are deteriorated.

This is a state in which the material 15 to be cut is eccentric to the circular saw 9, that is, the circular saw 9 rotates once to make the circular saw 9
The circular saw rotates at a high speed with a cycle that the outer circumference goes in and out.
This is because the process proceeds by cutting the outer circumference. As a result, the cutting resistance applied to the cutting edge 9a becomes an intermittent load during cutting. When the load becomes large due to this load fluctuation, the repulsive force from the material to be cut 15 to the cutting edge 9a becomes large. Since the circular saw 9 is formed of a thin disk, the repulsive force causes the blade tip 9a of the circular saw 9 to swing to the side surface side, affecting the cut surface of the material 15 to be cut. Further, since the center of gravity of the circular saw 9 rotates in a state of being eccentric with respect to the drive shaft 8, it causes vibration and abnormal noise to the main body.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a cutting machine having a good cutting surface and cutting accuracy.

[0006]

The above object is to have a drive shaft that transmits power from a motor shaft to rotate, and hold a rotary tool between two flanges that are detachably fitted to the drive shaft. In a cutting machine that presses the rotary tool with a fastening member to the flange and rotates the rotary tool to cut into a material to be cut, a ring-shaped elastic body is mounted between the flanges to support the rotary tool. Is achieved in.

[0007]

By tightening the fastening member, the disc spring-like elastic body provided between the two flanges is pushed by both flanges and expanded in the outer peripheral direction. The expansion of the elastic body eliminates a gap in the inner diameter portion of the rotary tool, pushes the rotary tool in the outer peripheral direction, and the center of the drive shaft coincides with the center of the rotary tool.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a sectional view of a circular saw mounting portion showing an embodiment of the present invention, FIG. 2 is an overall side view of a cutting machine, FIG. 3 is a partial sectional view showing a circular saw mounting, and FIG. 4 is a circular saw portion. FIG.

In the figure, a holder 2 is provided behind the base 1. A circular saw portion 4 having a notch handle 3 is supported on the holder 2 by a shaft 5 so as to be vertically swingable with respect to the upper surface of the base 1, and is urged upward by a spring 6. A drive shaft 8 is attached to the circular saw portion 4 by a motor 7.
A circular saw 9 that serves as a rotary tool that rotates through the is retained.

When the material 15 to be cut is cut with the circular saw 9,
First, the handle 3 is gripped and the circular saw portion 4 is swung downward to make a cut. After the material 15 to be cut is cut, if the pushing force is weakened, the circular saw portion 4 is pushed upward by the spring 6.

The circular saw mounting portion is provided with a flange 10 on the drive shaft 8.
And a collar 11 which is a disc spring-like elastic body are fitted, a circular saw 9 is held on the collar 11, a flange 12 is fitted from the outside, and a bolt 13 is screw fitted on the drive shaft 8. There is. A gap 14 is provided between the inner diameter of the circular saw 9 and the collar 11 to facilitate the attachment and detachment of the circular saw 9. When the bolt 13 which is the fastening member is tightened, the collar 11 is pressed by the flanges 10 and 12, the collar 11 becomes a flat plate, and the collar 11 is uniformly expanded in the outer peripheral direction, so that the circular saw 9 is in the outer peripheral direction. Since the center of the circular saw 9 and the center of the drive shaft 8 are pressed by the flanges 10 and 12 to press and fix the circular saw 9, the eccentricity of the circular saw 9 is eliminated.

[0012]

As described above, according to the present invention, since the rotating tool is rotated in a state where the eccentricity is eliminated, it is possible to improve the cutting surface and the cutting accuracy, and to reduce the occurrence of vibration and noise in the main body.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a circular saw attachment portion showing an embodiment of the present invention.

FIG. 2 is an overall side view of a cutting machine.

FIG. 3 is a partial cross-sectional view showing a circular saw attached.

FIG. 4 is a partial sectional front view of a circular saw portion.

FIG. 5 is a partial cross-sectional view showing a conventional circular saw attachment portion.

FIG. 6 is a cross-sectional view showing a state in which a material to be cut is being cut by a conventional cutting machine.

FIG. 7 is a perspective view showing a cut surface of a material to be cut.

[Explanation of symbols]

8 ... Drive shaft, 9 ... Circular saw, 10, 12 ... Flange, 11
... color, 13 ... bolt.

Claims (1)

[Claims] 1. A drive shaft that transmits power from a motor shaft to rotate, and holds a rotary tool between two flanges that are detachably fitted to the drive shaft. In a cutting machine which presses a rotary tool and rotates the rotary tool to cut into a material to be cut, an elastic collar formed like a disc spring between the flanges is mounted to support the rotary tool. A rotary tool attachment mechanism for a cutting machine.