JP2000219527A - Glass cutter wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to form inclined, deep and perpendicular cracks by forming grooves inclined at a prescribed angle with respect to the axial central direction of a disk-shaped wheel at a prescribed edge at the blade edge ridgeline of the wheel. SOLUTION: The cutting-off faces 23a of the grooves 23 of the glass cutter wheel 25 are inclined to make the amount of cutting off nonuniform on both sides of the ridgeline 22. The groove widths from the ridgeline 22 to both sides are not equal to each other and the groove depths h1 and h2 are not equal to each other as well. This wheel is applicable in the ranges of the following values: The wheel (ϕ): 1 to 20 mm, wheel thickness (W): 0.6 to 5 mm, blade angle (2θ): 90 to 160 deg., groove part depth (h2): 1 to 20 μm, pitch: 20 to 200 μm. The generation of the horizontal cracks may be drastically decreased when scribing is executed along a deformed shape line, such as a closed curve, by using this wheel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a glass cutter wheel capable of forming an inclined vertical crack in a glass plate.

[0002]

2. Description of the Related Art In order to cut a glass sheet, the surface of the glass sheet is scribed in one direction using a glass cutter wheel to generate a crack (referred to as a vertical crack) directed downward from the surface of the glass sheet. Stress on the
The glass plate is cut by growing the vertical cracks to the lower surface of the glass plate. Here is the upper diagram in Figure 1
As shown in (A), when the area 6a of the closed curve is cut out from the glass plate 6, as shown in the side view shown in the middle drawing (B),
If the direction of the vertical crack 10 is always inclined obliquely toward the outside of the closed curve, the region 6a to be cut can be easily separated from the glass plate 6 as shown in FIG.

For this purpose, a glass cutter wheel capable of forming an inclined vertical crack is disclosed in, for example, Japanese Patent Application Laid-Open No.
No. 2,278,474. The glass cutter wheel is referred to here.

FIG. 2 shows the glass cutter wheel in front.
It is the figure seen from (scribe direction). In the glass cutter wheel 2 rotatably provided with respect to the wheel cutter 1, the left edge angle 4 with respect to the ridgeline 3 of the edge is 73 ° and the right edge angle 5 with respect to the ridge line 3 is 83 °. Using this glass cutter wheel 2,
When scribed, a vertical crack 10 inclined downward to the left in the figure and a crack 1 generated on the surface of the glass plate
1 and 12 (referred to as horizontal cracks). Since the horizontal cracks 11 and 12 do not contribute to the cutting of the glass plate 6 but merely reduce the value of the product, it is necessary to minimize the occurrence of horizontal cracks.

When FIG. 2 shows a closed curve scribe, the area 6a on the right side of the vertical crack 10 is a product. Less than,
This area is the product 6a, the area 6 on the left side of the vertical crack 10.
b is called a non-product.

[0006]

However, since the vertical crack 10 obtained here is shallow, it is difficult to cut the product 6a from the glass plate 6, and since the vertical crack 10 is shallow, it is difficult to cut the product. Horizontal cracks occurred on the surface of the glass plate, and the quality of the product 6a was degraded.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to provide a glass cutter wheel capable of forming an inclined deep vertical crack.

[0008]

Means for Solving the Problems "Glass cutter wheel" disclosed in Japanese Patent Application Laid-Open No. 9-188534 filed earlier by the present applicant.
Is shown in FIG. This glass cutter wheel 21
Is a normal cutter wheel (i.e., the edge angle θ on both sides)
1 and θ2 are equal), enlarged views A1 and B
As shown in FIG. 1, a fine protrusion 24 was formed on the ridgeline of the cutting edge by cutting off a U-shaped groove 23 ′ having a depth h at a predetermined interval p (the shape of the groove itself is not limited to this). It has dramatically improved the scribe performance.

As can be seen from the enlarged view B1, the groove 23 '
Is symmetrical on both sides of the ridge 22 and the groove 23 '
Are equal on both sides of the ridge line 22. FIG. 4 shows a cross section taken along line L1 in the enlarged view B1. The groove widths W1, W2 from the ridge line 22 to both sides are equal to each other, and the groove depths h1, h2 at both ends of the groove are also equal to each other. That is, the cut surface 23a 'of the groove 23' is in a parallel relationship with the axial direction of the glass cutter wheel 21.

On the other hand, in the present invention, the cut surface of the groove is inclined, and the groove itself is inclined with respect to the axial direction of the glass cutter wheel, so that the cut amount of the groove is uneven on both sides of the cutting edge. I have to.

[0011]

By forming such grooves, inclined vertical cracks can be formed without impairing the scribing performance of the glass cutter wheel having the projections shown in FIG. In many experiments, it was confirmed that the occurrence of horizontal cracks in the steel can be significantly reduced. The reason why the vertical crack is inclined is considered to be that the edge of the cutting edge when scribing causes a slight shift in the groove, which results in an imbalance in the stress applied to the glass plate.

When scribing along the closed curve with the present glass cutter wheel, the occurrence of horizontal cracks in the area surrounded by the closed curve as a product can be greatly reduced, and thus it is particularly suitable for cutting the closed curve area.

[0013]

FIG. 5 is a view showing a first embodiment of the present invention, and portions corresponding to those in FIG. 3 are denoted by common reference numerals. In the present glass cutter wheel 25, as shown in enlarged views A2 and B2 of FIG. 5, the cut surface 23a of the groove 23 is inclined, and the cut amount is uneven on both sides of the ridge line 22. Note that the enlarged view A2 is a view as viewed from the arrow Z direction. Line L2 shown in the enlarged view B2
As shown in FIG. 6, the groove widths W1 and W2 from the ridge line 22 to both sides of the present glass cutter wheel 25 are not equal to each other, and the groove depths h1 and h2 at both ends of the groove are not equal to each other. . Here, the dimensions of the present glass cutter wheel 25 are shown in Table 1 as production examples, and the recommended processing data for the glass cutter wheels 25 produced in these production examples 1 and 2 are shown in Table 2.

[0014]

[Table 1]

[0015]

[Table 2]

As shown in FIG. 7, the present glass cutter wheel 25 is rotatably supported by a cutter head 46 via a suitable shaft 25b, and 46a is a stopper cap for the shaft 25b. The cutter head 46 is mounted on a known automatic glass scriber described later.

When the wheel diameter (φ) of the glass cutter wheel 25 is as small as several millimeters, the diameter of the shaft 25b inserted into the wheel 25 becomes 1 mm or less.
Axis management is not easy. Therefore, the glass cutter wheel 25 is preferably formed integrally with the shaft 25b as shown in FIG. 8A, and depending on the structure of the bearing portion of the cutter head 46, as shown in FIG. And 25b '
A pivot shaft may be adopted as shown by. Alternatively, as shown in FIG. 8C, an abacus-shaped glass cutter wheel 26 may be used, and both ends 26 'correspond to the above-mentioned pivot shaft 25b'.

FIG. 9 shows cracks on the surface of the glass plate 6 when the glass plate 6 is scribed according to the corresponding processing data in the glass cutter wheel 25 shown in Production Example 1 (almost the same result is obtained in Production Example 2). Show the pattern. The left figure shows a side view, and the glass cutter wheel 25 was set in the illustrated direction. Therefore, the upper side of the line of the edge line in the figure is the product 6a, and the lower side of the line is the non-product 6a.
b. This figure is an enlarged view by a microscope (right figure)
The size of the display does not correspond to the left figure.

FIG. 10 shows a state in which the glass plate 6 is divided by scribing in this manner, and then the divided glass pieces are put together. C1 indicates a horizontal crack generated in the product 6a, and C2 indicates a horizontal crack generated in the non-product 6b.

FIG. 11 is a cross-sectional view taken along the line XX in FIG. 9, and the vertical crack K1 is inclined downward and leftward in the figure. Table 3 shows the results of scribing the glass cutter wheels 25 according to Production Example 1 and Production Example 2 in accordance with the above-described processing data.

[0021]

[Table 3]

The inclination of the vertical crack K1 depends on the depth h of the groove.
1, h2, that is, it depends on the inclination of the groove 23 with respect to the axis of the glass cutter wheel 25.
Therefore, by adjusting the sizes of h1 and h2, it is possible to obtain a vertical crack K1 having an optimum inclination according to the processing object.

FIGS. 12 to 14 are scribed by the glass cutter wheel 21 shown in FIG. 3, and correspond to FIGS. 9 to 11, respectively. As can be seen by comparing both figures, when scribing with the glass cutter wheel 21, the vertical crack K2 is in the vertical direction, and the product 6
a and the non-product 6b have horizontal cracks C1 and C2 evenly generated. On the other hand, according to the present invention,
, The vertical crack K1 is inclined downward toward the non-product 6b and a large horizontal crack C2 is generated on the non-product 6b, but the horizontal crack C1 generated on the product 6a is considerably small. I have. Therefore, the present glass cutter wheel 25 is suitable for cutting out a region surrounded by a closed curve.

Each of the dimensions shown in Table 1 is merely an example for a thin plate and a thick plate, and the present invention relates to a wheel (φ): 1 to 20 mm, a wheel thickness (W): 0.6 to 5 mm 2θ): 90 to 160 ° Groove depth (h2): 1 to 20 μm (depending on W, 2θ) Groove depth (h1): 2 to 2500 μm (depending on W, 2θ) Pitch (p): 20 to 200 μm ( (depending on φ).

In the first embodiment, the shape of the groove when viewed from the side is U-shaped, but another embodiment adopting another shape will be described below. In each of these embodiments, only the enlarged view of the cutting edge is shown as indicated by A2 and B2 in FIG.

In the second embodiment shown in FIG. 15, as shown in the enlarged view A3, the shape of the groove 31 viewed from the side is V-shaped, and the cut surface of the groove 31 is the same as in the above embodiment. Because of the inclination, the shape of the groove 31 viewed from above is as shown in the enlarged view B3.

In the third embodiment shown in FIG. 16, as shown in the enlarged view A4, the shape of the groove 32 as viewed from the side is inclined in one direction like a saw blade, and the shape of the groove 32 as viewed from above is The shape is as shown in the enlarged view B4.

In the third embodiment shown in FIG. 17, as shown in the enlarged view A5, the shape of the groove 33 as viewed from the side has a uniform depth, and the shape of the groove 33 as viewed from above. Is as shown in an enlarged view B5.

FIG. 18 shows the glass cutter wheel 2 shown in FIG.
1 shows an example in which one groove 23 is formed using a disk grinder 51. Here, a glass cutter wheel is shown in FIG.
By tilting as shown in FIG. 9, an inclined groove can be formed. Since the groove itself is extremely fine, the groove may be formed by using an electric discharge machine.

FIG. 20 shows a circular product 6a from the glass plate 6.
2 shows a circular scriber 35 suitable for cutting out a sliver. A cutter head 46 that rotatably holds the glass cutter wheel 25 of the present invention is attached to an arm 38 that circulates on the surface of the glass plate around a fixed shaft 37 fixed to the glass plate 6 by a suction cup 36 with a thumb screw 39. Installed. By loosening the thumb screw 39, the cutter head 46 can be moved in the arm direction. By rotating the arm 38 while applying a scribe pressure to the cutter head 46 using a biasing means (not shown) such as a spring, scribing can be performed along a circle having a radius r. At this time, the glass cutter wheel 25 is set so that the vertical cracks face the outside of the product 6a.
Thereby, the generation amount of the horizontal crack on the product 6a side can also be suppressed.

FIG. 21 shows an automatic circular scriber 80 for automatically performing the circular scribe. Base 81
A horizontal member 83 extending horizontally from the upper end of a column 82 standing upright is provided, and a vertical bearing portion 84 is provided at the other end. The rotation shaft 85 inserted into the bearing portion 85 is directly connected to the rotation shaft of the motor 86 at the upper end, and an arm 87 extending horizontally from the lower end of the rotation shaft 85 is provided. The cutter head 88 is slidably provided. A glass cutter wheel 25 of the present invention is rotatably provided below the cutter head 88 via a biasing spring (not shown) in order to obtain a predetermined scribe pressure. The motor 86 itself can be moved up and down by a guide cylinder 89, so that the cutter head 88 can also be moved up and down. By the rotation of the motor 86, the cutter head 88 moves in a circle on the glass plate 1.

FIGS. 22 and 23 are a front view and a side view of a general automatic glass scriber. A table 41 on which a glass plate is placed is rotated by a rotating table 42 in the horizontal direction by θ, and The cutter head 46, which can be moved in the Y direction by a ball screw 44 and has the lower end rotatably mounted with the glass cutter wheel 25 of the present invention, is moved along the rail 47 in the X direction (a direction perpendicular to the paper surface). ).

At the time of scribing, the table 41 is moved in the Y direction and the θ direction, and simultaneously, the cutter head 46 is moved in the X direction.
By moving in the direction, it is possible to scribe along arbitrary straight lines and curved lines. Therefore, as shown in FIG. 24 (A), by cutting the cutter head 46 along one closed line, not only a circular scribe but also a product 6a of an arbitrary shape can be cut out.
Further, as shown in FIGS. (B) and (C), the product 6a having a desired shape can be obtained by cutting off the periphery by scribing along a plurality of straight lines or curves. Also in this case, the glass cutter wheel 25 is set on the product 6a side so as to reduce the amount of horizontal cracks generated.

FIG. 25 is a view showing “glass cutting” by the present applicant.
(Japanese Utility Model Publication No. 62-23780) in which the glass cutter wheel 25 of the present invention is mounted. Reference numeral 61 denotes a cylindrical handle (handle) serving as a grip portion. A head 62 is provided below the handle, and the glass cutter wheel 25 of the present invention is rotatably mounted on the lower end of the head 62. Here, further, in order to supply oil to the glass cutter wheel 25, an oil chamber 63 provided in the hollow portion of the handle, an oil chamber cap 64, and a mechanism 6 associated therewith are provided.
5 to 73, which are not directly related to the invention of the present application and will not be described.

Finally, for reference, FIGS. 9, 11 and 1
2 and FIG. 2 show a microscope enlarged photograph (× 200) corresponding to FIG.
6, FIG. 27, FIG. 28, and FIG.

[0036]

As described above, the glass cutter wheel of the present invention is inclined by forming grooves inclined at a predetermined angle with respect to the axial direction of the wheel at a predetermined pitch in the ridgeline of the cutting edge. Vertical cracks can be formed, and when scribing along a contour line such as a closed curve or rectangle using this glass cutter wheel, set this wheel so that the vertical cracks always tilt outside the closed area. By doing so, a deep vertical crack can be obtained, and at the same time, the occurrence of horizontal cracks on the product side can be significantly reduced, and the productivity yield can be improved. In addition, since the inclination of the vertical crack can be freely changed by changing the inclination angle of the groove, it is possible to obtain a vertical crack having an optimum inclination according to a processing object.

[Brief description of the drawings]

FIG. 1 is a diagram showing a state of cutting a closed curve area;

FIG. 2 is a diagram showing a cutting method disclosed in the official gazette;

FIG. 3 is a diagram of a glass cutter wheel disclosed in the official gazette

FIG. 4 is an enlarged view of a ridgeline of the cutting edge in FIG. 3;

FIG. 5 is a view of a glass cutter wheel showing a first embodiment of the present invention.

6 is a partially enlarged sectional view of FIG.

FIG. 7 is a view showing mounting of the glass cutter wheel of the present invention on a cutter head.

FIG. 8 is a diagram in which the glass cutter wheel of the present invention is formed integrally with a shaft.

FIG. 9 is a diagram showing cracks on the glass surface when scribing with the glass cutter wheel of the present invention.

FIG. 10 is an enlarged view of a crack when glass pieces cut by the scribe in FIG. 9 are brought into contact with each other.

FIG. 11 is a view showing a vertical crack generated at the time of scribing in FIG. 9;

FIG. 12 is a diagram showing cracks on the glass surface when scribing with the glass cutter wheel of FIG. 3;

FIG. 13 is an enlarged view of a crack when pieces of glass cut by the scribe in FIG. 12 are brought into contact with each other.

FIG. 14 is a view showing a vertical crack generated at the time of scribing in FIG. 12;

FIG. 15 is a partially enlarged view of a glass cutter wheel showing a second embodiment of the present invention.

FIG. 16 is a partially enlarged view of a glass cutter wheel showing a third embodiment of the present invention.

FIG. 17 is a partially enlarged view of a glass cutter wheel showing a fourth embodiment of the present invention.

FIG. 18 is a view showing a method of forming grooves of the glass cutter wheel of FIG. 3;

FIG. 19 is a view showing a method of forming a groove of the glass cutter wheel of the present invention.

FIG. 20 is a diagram of a circular scriber to which the glass cutter wheel of the present invention is applied.

FIG. 21 is a front view of an automatic circular scriber to which the glass cutter wheel of the present invention is applied.

FIG. 22 is a front view of an automatic glass scriber to which the glass cutter wheel of the present invention is applied.

FIG. 23 is a side view of an automatic glass scriber to which the glass cutter wheel of the present invention is applied.

FIG. 24 is a diagram showing an example of scribe when the apparatus shown in FIG. 21 is used.

FIG. 25 is a diagram showing a hand-cut type of glass cutting;

FIG. 26 is an enlarged view of a micrograph corresponding to FIG. 9;

FIG. 27 is an enlarged view of a micrograph corresponding to FIG.

FIG. 28 is an enlarged view of a micrograph corresponding to FIG.

FIG. 29 is an enlarged view of a micrograph corresponding to FIG.

[Explanation of symbols]

 Reference Signs List 6 glass plate 6a product 22 blade edge 23 groove 23a cutout surface 24 projection 25,26 glass cutter wheel 25b shaft 31-33 groove 35 circular scriber 36 sucker 37 fixed shaft 38 arm 39 wing screw 41 table 42 rotary table 46 cutter head 51 disk Grinder K1 Vertical crack C1, C2 Horizontal crack

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[Procedure amendment]

[Submission date] February 15, 1999 (1999.2.1
5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

As can be seen from the enlarged view B1, the groove 23 '
Are symmetrical on both sides, and the cutout amount of the groove 23 ′ is uniform on both sides of the ridge 22. Enlarged view B
FIG. 4 shows a cross section taken along line L1 shown in FIG. The groove widths W1, W2 from the ridge line 22 to both sides are equal to each other,
The groove depths h1 and h2 at both ends of the groove are also equal to each other. That is, the cut surface 23a 'of the groove 23' is in a parallel relationship with the axial direction of the glass cutter wheel 21.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction contents]

FIG. 21 shows an automatic circular scriber 80 for automatically performing the circular scribe. Base 81
A horizontal member 83 extending horizontally from the upper end of a column 82 is provided at the other end, and a vertical bearing portion 84 is provided at the other end. The rotating shaft 85 inserted into the bearing portion 84 is directly connected to the rotating shaft of the motor 86 at the upper end, and an arm 87 extending horizontally from the lower end of the rotating shaft 85 is provided. The cutter head 88 is slidably provided. A glass cutter wheel 25 of the present invention is rotatably provided below the cutter head 88 via a biasing spring (not shown) in order to obtain a predetermined scribe pressure. The motor 86 itself can be moved up and down by a guide cylinder 89, so that the cutter head 88 can also be moved up and down. By the rotation of the motor 86, the cutter head 88 moves in a circle on the glass plate 1.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a diagram showing a state of cutting a closed curve area;

FIG. 2 is a diagram showing a cutting method disclosed in the official gazette;

FIG. 3 is a diagram of a glass cutter wheel disclosed in the official gazette

FIG. 4 is an enlarged view of a ridgeline of the cutting edge in FIG. 3;

FIG. 5 is a view of a glass cutter wheel showing a first embodiment of the present invention.

6 is a partially enlarged sectional view of FIG.

FIG. 7 is a view showing mounting of the glass cutter wheel of the present invention on a cutter head.

FIG. 8 is a diagram in which the glass cutter wheel of the present invention is formed integrally with a shaft.

FIG. 9 is a diagram showing cracks on the glass surface when scribing with the glass cutter wheel of the present invention.

FIG. 10 is an enlarged view of a crack when glass pieces cut by the scribe in FIG. 9 are brought into contact with each other.

FIG. 11 is a view showing a vertical crack generated at the time of scribing in FIG. 9;

FIG. 12 is a diagram showing cracks on the glass surface when scribing with the glass cutter wheel of FIG. 3;

FIG. 13 is an enlarged view of a crack when pieces of glass cut by the scribe in FIG. 12 are brought into contact with each other.

FIG. 14 is a view showing a vertical crack generated at the time of scribing in FIG. 12;

FIG. 15 is a partially enlarged view of a glass cutter wheel showing a second embodiment of the present invention.

FIG. 16 is a partially enlarged view of a glass cutter wheel showing a third embodiment of the present invention.

FIG. 17 is a partially enlarged view of a glass cutter wheel showing a fourth embodiment of the present invention.

FIG. 18 is a view showing a method of forming grooves of the glass cutter wheel of FIG. 3;

FIG. 19 is a view showing a method of forming a groove of the glass cutter wheel of the present invention.

FIG. 20 is a diagram of a circular scriber to which the glass cutter wheel of the present invention is applied.

FIG. 21 is a front view of an automatic circular scriber to which the glass cutter wheel of the present invention is applied.

FIG. 22 is a front view of an automatic glass scriber to which the glass cutter wheel of the present invention is applied.

FIG. 23 is a side view of an automatic glass scriber to which the glass cutter wheel of the present invention is applied.

FIG. 24 is a diagram showing an example of scribe when the apparatus shown in FIG. 22 is used.

FIG. 25 is a diagram showing a hand-cut type of glass cutting;

FIG. 26 is an enlarged view of a micrograph corresponding to FIG. 9;

FIG. 27 is an enlarged view of a micrograph corresponding to FIG.

FIG. 28 is an enlarged view of a micrograph corresponding to FIG.

FIG. 29 is an enlarged view of a micrograph corresponding to FIG.

DESCRIPTION OF SYMBOLS 6 Glass plate 6a Product 22 Blade edge 23 Groove 23a Cutout surface 24 Projection 25,26 Glass cutter wheel 25b Shaft 31-33 Groove 35 Circular scriber 36 Suction cup 37 Fixed shaft 38 Arm 39 Thumb screw 41 Table 42 Rotary table 46 Cutter head 51 Disc grinder K1 Vertical crack C1, C2 Horizontal crack

Claims (11)

[Claims] 1. A glass cutter wheel having grooves formed at a predetermined pitch on a blade edge line of a disk-shaped wheel at a predetermined angle with respect to the axial direction of the wheel. 2. The glass cutter wheel according to claim 1, wherein the pitch of the grooves is 20 to 200 μm according to the wheel diameter of 1 to 20 mm. 3. The groove depths h1 and h2 at both ends of the groove are:
3. The glass cutter wheel according to claim 1, wherein h1: 2 to 2500 [mu] m and h2: 1 to 20 [mu] m according to the wheel diameter of 1 to 20 mm. 4. The shape of the groove when viewed from the side is U-shaped.
The glass cutter wheel according to any one of claims 1 to 3, wherein the glass cutter wheel has a V-shape, a V-shape, a saw blade shape, or a concave shape. 5. The glass cutter wheel according to claim 1, wherein the glass cutter wheel is formed integrally with a shaft inserted through the glass cutter wheel. 6. A cutter head is provided at a predetermined portion of an arm provided so as to be freely rotatable on a glass plate, and the cutter head is inclined at a predetermined angle with respect to the axial direction of the wheel at a blade edge of a disk-shaped wheel. A circular scriber characterized by mounting a glass cutter wheel having grooves formed at a predetermined pitch. 7. A cutter head is provided at a predetermined portion of an arm provided so as to be freely rotatable on a glass plate, and the cutter head is inclined at a predetermined angle with respect to the axial direction of the wheel at a blade edge of a disk-shaped wheel. An automatic circular scriber comprising: a glass cutter wheel having grooves formed at a predetermined pitch; and a motor for rotating the arm. 8. An automatic glass scriber having a mechanism in which a table on which a glass plate is mounted is rotated by θ and moves in the X and Y directions relative to a cutter head, wherein a cutting edge of a disc-shaped wheel has An automatic glass scriber wherein a glass cutter wheel having grooves inclined at a predetermined angle with respect to the axial direction of the wheel at a predetermined pitch is mounted on the cutter head. 9. A glass cutter in which a glass cutter wheel is rotatably mounted on a lower end portion of a cylindrical handle serving as a grip portion, wherein the glass cutter wheel is attached to a cutting edge of a disk-shaped wheel and an axis of the wheel. A glass cutter characterized by forming grooves inclined at a predetermined angle with respect to a direction at a predetermined pitch. 10. A glass cutter wheel which forms a groove inclined at a predetermined angle with respect to the axial direction of the wheel at a predetermined pitch in a ridgeline of the cutting edge of the disk-shaped wheel, and uses a glass cutter wheel forming an inclined vertical crack. A method for cutting a region surrounded by a closed curve by setting the glass cutter wheel so that a vertical crack always faces outside the closed curve when scribing along the closed curve. 11. By forming grooves, which are inclined at a predetermined angle with respect to the axial direction of the wheel, at a predetermined pitch on the ridgeline of the cutting edge of the disc-shaped wheel, the amount of horizontal cracks generated on both sides of the scribe line is not reduced. A scribing method characterized in that the present glass cutter wheel is set and scribed using a uniform glass cutter wheel so that horizontal cracks are reduced on the product side.