JPH0538881Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a simple cutting machine used mainly for on-site construction for tiles, wood, glass, plastics, etc. The present invention relates to a cutting machine in which a cutter bed is configured to rotate and tilt between a horizontal position and a 1/2 right angle position via a rotation shaft.

(Prior art) For example, when cutting tiles, etc. at a construction site, etc., the tiles are cut at right angles to the surface of the tiles, and in addition, in order to butt the corners, a predetermined frame is cut, for example, in the case of right-angled butts. The cutting process is performed at an inclined angle of 1/2 right angle (45 degrees).

As a cutting machine for such inclined machining, a cutter bed equipped with a cutter body rotates downward from its horizontal position through a rotation axis between an angular position approximately 1/2 right angle to the cutter body. It is known that the blade is configured to be inclined between a vertical position and an approximately one-half right angle (45 degrees) position.

FIG. 3 of the accompanying drawings shows the main parts of a conventional rotation mechanism in this type of cutting machine. In the same figure, reference numeral 60 is a processing table on which the workpiece W is placed, 63 is a rotation shaft for the cutter bed, and 65
70 represents the cutter bed (bearing portion), and 70 represents the blade (portion) of the cutter body.

The cutter 70 indicated by a solid line in the figure shows its vertical position, and the cutter 70 cuts a workpiece W such as a tile placed on the processing table 60 to a notch depth D3.
Cut at right angles.

In addition, in this type of cutting machine, as the blade 70 rotating at high speed moves toward the front in the drawing, a suitable plate is installed directly below the lower end 70P of the cutting edge of the blade 70 to prevent it from coming into contact with the pivot mechanism such as the rotation shaft 63. Space is provided.

However, in this conventional apparatus, when cutting a workpiece W such as a tile with a 1/2 right angle (45 degree) inclined cutting plane for right-angled butting at a corner, As shown by the dotted chain line, cutting is performed by rotating the cutter bed 65 downward via the rotating shaft 63 and tilting the blade 70 to a 1/2 right angle inclined position indicated by reference numeral 80. .

At this time, the distance between the lower end 80P of the cutting edge of the cutting tool 80 and the workpiece W at the 1/2 right angle inclined position,
In other words, the cutting depth becomes D4, which is lowered by a distance d5 compared to the lower end 70P of the blade when cutting at right angles.

This depth difference d5 is expressed by the following equation.

d5=R-R sin(90-45)...Equation (1) However, R is the lower end of the cutting edge 70P, 80P and the rotation axis 6
This is the distance from the axis of 5.

As is clear from the above formula and drawings, this conventional device has a mechanism in which the more the blade is tilted from the perpendicular position, the greater the depth of cut becomes, and the rate of increase gradually increases. .

Originally, the cutting depths D3 and D4 of the cutters 70 and 80 into the workpiece W are adjusted to the most suitable depths according to processing conditions such as the type of the cutter and the workpiece. However, in this conventional device, as mentioned above, a large shallow depth difference d5 occurs in the depth of cut due to the inclined position of the blade, and in such a case, for example, the blade does not touch the workpiece at the initial stage of machining. There were problems such as the cutting surface not being cut properly, the cutting surface being distorted, and the blade chipping.

On the other hand, in order to adjust the difference in depth of cut, the protrusion amount of the circular saw is adjusted (smaller), as in the circular saw disclosed in Japanese Utility Model Application Publication No. 191301/1983, for example. ) A device equipped with a tilting mechanism has been proposed. However, providing such a mechanism for adjusting the protrusion amount of the blade increases the size and complexity of the mechanism, leading to increased costs. Therefore, it cannot be used in a portable, small and simple cutting machine such as a tile cutter.

(Problem to be solved by the invention) This invention was proposed in view of the above-mentioned problems, and its purpose is to solve the problem by using a normal mechanism without any special mechanism. It is an object of the present invention to provide a simple cutting machine capable of obtaining a relatively uniform depth of cut of a cutter into a workpiece in both machining and inclined machining.

(Means for Solving the Problem) That is, in the cutting machine according to this invention, the cutter bed having the cutter body on the upper part is rotated so that the upper surface of the cutter bed is moved downward from the horizontal position to a position approximately one-half perpendicular to the lower part. The blade of the cutter body is configured to tilt between a vertical position and an approximately 1/2 right angle position by rotating the cutter bed between the vertical position and the 1/4 right angle position. The lower end of the cutting edge of the cutter is arranged so as to be located directly above the axis of the rotating shaft, and the height position of the lower end of the cutting edge of the cutting tool in the horizontal position of the cutter bed and in the 1/2 right angle inclined position. This feature is characterized in that they are made to be the same.

(Function) In the cutting machine having the above configuration, the lower end of the cutting edge of the cutter at the inclined position perpendicular to one-quarter of the cutter bed is arranged so as to be located directly above the axis of the rotating shaft. From, the height of the lower end of the cutting edge of a double-edged tool at the vertical position of the blade for right-angle machining, which is most frequently used, and at the 1/2 right-angle inclined position of the blade for 1/2 right-angle inclined machining. The positions will be the same.

In other words, the vertical position of the cutter for right-angle machining and the 1/2 right-angle tilted position of the cutter for 1/2 right-angle tilt machining are 4, when the lower end of the cutting edge of the cutter is directly above the axis of the rotation axis. The blades are rotated by the same phase in opposite directions from the tilted position perpendicular to 1/2, that is, the position where the depth of cut of the blade into the workpiece is the shallowest. Therefore, the cutting depth of the cutter into the workpiece during the above two machining operations is completely the same.

In addition, with this cutting machine, as mentioned above, the inclination phase angle of the blade is small from the position where the depth of cut is the shallowest to the position where it is the deepest. Since the locus of movement of the tip of the cutting tool is a circular geometric shape, the difference in depth of cut due to the inclination of the cutting edge can be made extremely small.

(Example) Hereinafter, an example of this invention will be described according to the drawings. Figure 1 of the accompanying drawings is an overall side view of a cutting machine that is an embodiment of this invention, Figure 2 is an enlarged view of section A in Figure 1 showing the rotation mechanism, and Figure 3 is a comparison with Figure 2. FIG. 2 is an enlarged view showing a rotation mechanism in a conventional cutting machine.

As shown in FIG. 1, this cutting machine 10 is
Fixed processing table 15 on which the workpiece W is placed
, a cutter bed 30 that is tilted downward via a rotating shaft 20, and a cutter body 40 provided on the upper surface of the cutter bed 30, so that the cutter 50 of the cutter body 40 can be moved approximately from its vertical position. It can be rotated to a 1/2 right angle angle position to freely set the inclination. Reference numeral 12 in the figure represents a leg portion that supports the processing table 15.

The cutter bed 30 is attached to the processing table 15 by pivoting the side plate 16 fixed to the processing table 15 and the side plate 31 of the cutter bed 30 through the rotation shaft 20. It is configured to be tiltable. Note that the rotation shaft 20 is a cutter 50.
It is provided with an appropriate space just below the lower end 50P of.

The side plate 16 also includes an adjustment screw member 2 that guides the keyway hole 32 of the side plate 31, which is the movable side.
5 is fixedly installed, so that the inclination angle of the cutter 50 can be adjusted and set as appropriate. Number 33 in the diagram
is a scale that displays the angle of inclination.

The cutter body 40 is placed on the upper surface of the bed portion 35 of the cutter bed 30 via the slide base 41. The cutter body 40 includes the bed portion 35 and a rail member 36 provided on the bed portion.
Accordingly, the movement of the drawing in the front and back directions is guided. Reference numeral 43 in the figure is a handle for moving the cutter body.

Next, it is an enlarged view of section A in FIG. 1 of the rotation mechanism according to this invention. This will be explained according to FIG.

In the cutting machine 10 according to this invention, the cutter bed 30 is inclined and the cutter 50 is placed at the position shown by the solid line in FIG. In this case, the cutter body 40 and the cutter bed 30 are arranged so that the lower end 51P of the cutting edge of the cutter 51 is located directly above the axis 21 of the rotating shaft 20.

Therefore, as can be easily understood from Fig. 2,
The lower end 50P of the cutting edge of the cutting tool 50 when performing vertical processing on the workpiece W (the cutting tool position shown by the solid line in FIG. 1)
and a cutter 52 when performing 1/2 right angle inclined machining.
The lower end 52P of the cutting edge (the position of the cutting tool indicated by the two-dot chain line in FIG. 1) is at exactly the same height as the cutting depth D1 into the workpiece W.

Furthermore, although FIG. 2 is shown to the same scale as FIG. 3, as can be easily understood from the comparison between the two figures, in the cutting machine 10 of this invention, the blade is positioned half way from the vertical position 50. The shallow depth difference d2 at the lower end of the cutting edge that occurs when the blade is set to the 1 right angle inclined position 52 is much smaller than d5 of the conventional device.

This depth difference d2 is expressed as follows.

d2=R-R sin(90-22.5)...Equation (2) However, R is the distance between the lower end 50P of the cutting edge of the cutter 50 and the axis 21 of the rotating shaft 20.

From this equation (2) and the above-mentioned equation (1), the shallow depth difference d2 of the cutting depth of this invention is compared with the conventional shallow depth difference d5 as follows.

d2/d5={R-R sin(67.5)}/{R-R
sin(45)} = {1-sin(67.5)}/{1-sin(45)} =0.26 In other words, with this cutting machine, the shallow difference in cutting depth
It can be seen that d2 is only 26% of the conventional shallow depth machine difference d5.

(Effects) As shown and explained above, according to this invention,
The lower end position of the cutting edge of the cutter when performing right angle machining on the workpiece and the lower end position of the cutting edge of the cutter when performing 1/2 right angle inclined machining can be configured to be at the same height. The cutting depth of the cutter into the workpiece during the above two machining operations, which were greatly different in the apparatus, can be made completely the same. Therefore, it is possible to perform the right angle machining and the half right angle machining, which are most often used in actual construction, at an ideal depth of cut, and the usability can be greatly improved.

Furthermore, even when cutting at any angle of inclination other than 1/2 right angle, according to this invention, the difference in depth of cut of the blade is extremely small (approximately 1/4 of the conventional one). This eliminates problems such as distortion of the cutting surface or damage to the cutting tool, and allows for extremely good machining work.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of a cutting machine showing an embodiment of this invention, Fig. 2 is an enlarged view of section A in Fig. 1 showing its rotation mechanism, and Fig. 3 is a conventional cutting machine in comparison with Fig. 2. FIG. 2 is an enlarged view showing a rotation mechanism in the cutting machine. 10...cutting machine, 15...processing table, 20
... Rotation axis, 21 ... Axis center, 30 ... Cutter bed, 40 ... Cutter body, 50P ... Lower end of cutting edge, V ... Vertical line, W ... Workpiece, θ ... Blade inclination angle .

Claims (1)

[Claims for Utility Model Registration] A bed for a cutter having a cutter body on its upper part rotates its upper surface downward from a horizontal position to approximately a 1/2 right angle position via a rotating shaft, and the cutter body The cutter is configured to be inclined between a vertical position and an approximately one-half right angle position, wherein the lower end of the cutting edge of the cutter in the one-quarter right angle inclined position of the cutter bed is aligned with the rotation axis. It is characterized by being arranged so as to be located directly above the axis, so that the height position of the lower end of the cutting edge of the cutter is the same in the horizontal position of the cutter bed and in the 1/2 right angle inclined position. cutting machine.