JPH0656451A - Glass cutter - Google Patents

Abstract

PURPOSE:To prevent slip from a glass sheet and obtain good section by forming a streak in a direction always making definite angle to radiating direction from a shaft supporting part to the blade tip in looking wheel of a glass cutter from either one front part. CONSTITUTION:The figure shows the front view and the side view of a wheel of a glass cutter. A streak 3 is formed always in the direction of a definite angle theta to the radiating direction A from rotation center O in a blade edge 2 of the wheel 1 obtained by slantingly shaving the both side circumferential edge parts to a disk made of steel to coarsen the face of the blade edge 2. By forming the streak 3 in such way, when the wheel 1 is brought into contact with the glass sheet under pressure, the tip part of the blade edge 2 is bitten in the glass sheet, and at this time, the wheel 1 is surely engaged with the glass sheet by the streak 3 formed in the blade edge 2. When the wheel 1 is tumbled on the glass sheet at this state, slip of engagement is largely prevented by tumbling the wheel 1 to rotating direction B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel type glass cutter for cutting a scribe line for cutting on a glass plate.

[0002]

2. Description of the Related Art A glass cutter of this type is one in which a wheel made of a steel disk is shaving the circumferential edges on both sides obliquely, and a blade having an obtuse angle when viewed from the side is rotatably supported. Is. A scribe line is formed on the glass plate by rolling the wheel while the glass cutter is pressed against the glass plate.

Since the cutting edge is generally polished by a grindstone having a JIS grain size of about 800, when a crow plate is scribed along a curve, the wheel slips on the glass plate. Therefore, in the "glass creasing cutter" (Japanese Utility Model Publication No. 54-180463),
The surface of the cutting edge is roughened to prevent slipping.

[0004]

However, since the meshing with the glass plate cannot be improved so much by simply making the cutting edge rough and rough, it is not possible to completely eliminate the slip described above. In addition, when the glass was cut, the cut edge was defective, and the blade edge was worn when slipping, shortening the life of the glass cutter. The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a glass cutter that can obtain a good cut by eliminating slip with a glass plate and that can extend the life. .

[0005]

SUMMARY OF THE INVENTION According to the present invention, a wheel made of steel is rotatably rotatably supported by shaving the circumferential edges on both sides of a steel disk obliquely and forming an obtuse edge when viewed from the side. In the glass cutter formed as described above, when the wheel is viewed from one front side, the blade edge is formed by forming a striation in a direction that always forms a constant angle with respect to the radial direction from the shaft supporting portion with respect to the blade edge. Is characterized by roughening.

[0006]

According to the above construction, when the wheel is pressed against the glass plate by forming a striation on the blade edge, friction between the wheel and the glass plate increases, and when the wheel is viewed from the front side. On the cutting edge, since the streak was formed in a direction that always forms a constant angle with respect to the radial direction from the shaft supporting portion, when the wheel is rolled in one predetermined direction, Engagement is secure and wheel slip is eliminated.

[0007]

1 shows a front view and a side view of a wheel of a glass cutter of the present invention. The cutting edge 2 of the wheel 1 obtained by shaving the circumferential edge portions on both sides with respect to the steel disk is inclined at a constant angle θ with respect to the radial direction A from the rotation center O of the wheel 1. A streak 3 is formed on the surface to make the surface of the cutting edge 2 rough. In addition, although the traces 3 are drawn roughly in the drawing, they are actually engraved densely.

By forming such streaks 3,
When the wheel 1 is pressed against the glass plate, the tip of the cutting edge 2 bites into the glass plate. At that time, the striations formed on the cutting edge 2 ensure the meshing between the wheel 1 and the glass plate. When the wheel 1 rolls on the glass plate in this state, rolling in the direction of rotation B shown in FIG. 1 may result in a larger mesh as compared with the case of rolling in the opposite direction. It is possible to eliminate the slip of the wheel 1.
That is, the wheel 1 formed as described above has the same effect as that of forming a saw blade on the wheel 1 as shown in FIG.

The method of forming the scratches as shown in FIG. 1 will be described below. As shown in FIG. 3, in order to scrape the peripheral edge of the steel plate 1 ′ with respect to the flat plate grinder 4 rotating at a high speed in the direction of the arrow C to form the cutting edge 2, the steel plate 1 ′ is slanted and abutted, The steel plate 1 ′ is rotated at a low speed in the direction of arrow D so that the entire peripheral edge is polished.

A plan view in that case is shown in FIG. 4, and the black-painted portion of the steel plate 1'shows the contact portion with the grinder 4, that is, the polishing portion. The streak in this case is steel plate 1 '
Concentric striations are formed on. Further, in FIG. 3, the steel plate 1 ′ is turned in the direction E by approximately 90 °, and the polishing portion is
If it is like, the streak at that time is in the radial direction. Therefore, as shown in FIG. 5, if the direction of the steel plate 1 ′ is appropriately changed and polished, as shown in FIG. 1, a striation in the θ direction with respect to the radial direction A can be formed.

The surface roughness of the cutting edge 2 is made relatively large in order to ensure the engagement with the glass plate by the scratches on the cutting edge 2.
The grinder 4 is selected so as to be (for example, 3.2S of JISB0601 (height is 3.2 microns)). In this embodiment, the steel plate 1'was polished to obtain the wheel 1 having a desired striation, but it is also possible to form only the striation according to the present invention on a commercially available wheel. Further, although the streak is formed on the entire cutting edge 2, the streak may be formed only on the portion contacting the glass plate.

[0012]

As described above, according to the present invention, when the wheel of the glass cutter is viewed from one front side, the blade edge is always oriented at a constant angle with respect to the radial direction from the shaft support. The blade edge is roughened by forming a scratch on the glass plate, and if this wheel is rolled in one predetermined direction on the glass plate, the engagement of the blade edge with the glass plate becomes reliable, and the wheel slips Since it does not exist, slippage with the glass surface of the cutter wheel causes local wear, which slows down the cutting edge and negates the distortion of the perfect circle, which eliminates the possibility of accelerating and becoming impossible to scribe. . Also, since the meshing with the glass plate is reliable, so-called "muscle cracks" are eliminated even in the cutting method in which scribing starts from the glass surface, and even in the case of curved scribing with a small radius, the conventionally required scribing speed Easy and accurate creasing without the need for changing adjustments. That is, according to the present invention, in straight line and curved line scribing, defects such as "muscle jumping" and "new jumping off" are eliminated, the yield is improved, and the sharpness is improved and the life of the cutter wheel is greatly increased. Can be extended to.

[Brief description of drawings]

FIG. 1 is a front view and a side view of a wheel in a glass cutter of the present invention.

FIG. 2 is a diagram in which a saw blade is formed on the cutting edge of the wheel of FIG.

FIG. 3 is a diagram showing a method for forming streaks according to the present invention.

FIG. 4 is a diagram showing a polished portion in FIG.

FIG. 5 is a diagram showing a polished portion in FIG.

FIG. 6 is a diagram showing a polished portion in FIG.

[Explanation of symbols]

 1 wheel 1'steel plate 2 cutting edge 3 streak 4 grinder

Claims (1)

[Claims] 1. A glass cutter in which a wheel is rotatably rotatably supported, in which circumferential edge portions on both sides of a steel disk are cut off obliquely to form an obtuse edge when viewed from the side, When the wheel is viewed from one front side, the cutting edge is roughened by forming a striation on the cutting edge in a direction that always forms a constant angle with respect to the radial direction from the shaft support. And a glass cutter.