JPH02153833A - Method for cutting flat glass and apparatus therefor - Google Patents

Abstract

PURPOSE:To enable cutting of a narrow glass plate by flawing one surface of the glass plate, pushing and moving the glass plate using a desired cutting position of the other surface of the flawed glass as an axial line. CONSTITUTION:One surface (1b) of a glass plate 1 engaged with a nipping groove 3 is located at a position facing to an edge (3a) of the groove 3. The position of the glass facing to the edge (3a) is a desired cutting position (2a). A supporting member 5 is then brought into contact with one surface (1a) of the bisected glass plate 1 to push and move the other piece (1B) of the glass plate 1 nipped with the groove 3 in the direction of an arrow (a). Thereby, the desired cutting position (2a) of the glass plate 1 is brought into contact with the edge (3a). If the glass plate 1 is subsequently pushed and moved, tensile stress is applied to the one glass surface (1a) using the desired cutting position (2a) in contact with the edge (3a) as an axial line. When the tensile stress attains the limit, the glass plate 1 is bisected into pieces (1A) and (1Ba) from a line (L) connecting the flaw 2 to the desired cutting position (2a) as a cutting line.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for cutting a plate glass containing plate-shaped ceramics, and a plate glass cutting apparatus suitable for carrying out this method.

(Prior art) A method for mechanically cutting plate glass is to make use of the property of glass, which is weak against tension, to scratch its surface and cut it by applying tensile stress to the scratched area. There is. As means for scratching the glass surface, there are known methods for scratching the glass surface with a diamond cutter and scratching the glass surface by moving a carbide rotary blade while pressing it against the glass surface. The plate glass that has only been scratched will still remain in a plate shape, but when pressure is applied to the desired cutting position on the opposite side of the glass surface from the scratched image, tensile stress is applied to the scratched area. The part is then cut along a line connecting the wound and the desired cutting position.

Plate glass cutting equipment! ! (Player) is a cutter that places a scratched plate glass on a support made of an elastic material, and then presses a roller made of relatively hard rubber or the like to the desired cutting position. Those that generate tensile stress are known.

(Problem to be Solved by the Invention) When obtaining a narrow plate glass from a large plate glass, in order to cut out as many narrow glass pieces as possible, it is necessary to reduce the number of glass pieces by reducing unnecessary parts. It is necessary to reduce the cost per unit. Also.

During the process of completing the desired device by applying some kind of treatment to the glass surface, the necessary glass part is
It may become unnecessary after completion, and it is necessary to cut off this unnecessary part. In this case as well, it is desirable that the removed portion be as small as possible.

The above-described conventional glass plate cutting method and apparatus have a limitation in that one piece of the glass plate to be cut must have a width that is at least 5 to 6 times the thickness of the glass. In other words, when it is desired to cut off a narrow piece of glass that is less than 5 to 6 times the thickness of the plate, there is a problem in that the conventional sheet glass cutting techniques cannot meet the desired requirement.

An object of the present invention is to provide a plate glass cutting method and an apparatus therefor that can solve the above-mentioned 1SF1 problem and cut glass with a narrow radius.

(Means for Solving the Problems) The present invention provides a sheet glass cutting method in which temporary glass is mechanically cut by scratching one surface of a sheet glass and applying tensile stress to the scratched portion. Cut the glass plate by holding at least one piece of the glass plate to be separated and pushing the glass plate with the desired cutting position on the other side of the scratched plate glass as the axis to apply tensile stress to the scratched area. a holding means for holding at least one piece of the plate glass that is cut by the scratched part; an axis-forming member that is brought into contact; a support means that is in contact with the scratched surface of the glass sheet and supports the other piece of the glass sheet that is to be separated; and the clamping member and the support member that are centered around the axis-forming member. and a drive means for applying tensile stress to the scratches on the glass plate by relatively moving the glass plate.

(Function) At least one piece of the temporary glass that is cut by the scratch is held by the clamping means, and the other surface of the glass sheet is cut with the desired cutting position on the other surface of the glass sheet that has been scratched as the axis. When the glass plate is pushed to apply tensile stress to the scratched portion, the plate glass is cut along a line connecting the scratch and the desired cutting position.

(Example) Hereinafter, the present invention will be described in detail based on the illustrated example.

First, referring to FIG. 1, the principle of the plate glass cutting method of the present invention and points to be kept in mind when carrying out the method will be explained. A scratch 2 (scribe line) is made on one side 1a of the glass plate 1 to be separated by a suitable glass scriber (see FIG. 2), and the glass plate 1 is held between holding means 4 having holding grooves 3. ing. The length of the clamping groove 3 is in the longitudinal direction of the glass plate 1 (perpendicular to the paper surface).
It is formed to have a length greater than the length of the glass.

The width thereof is formed to be slightly larger than the thickness of the plate glass 1. In this case, one piece IA of the glass plate 1 that is damaged by the scratch 2 is engaged with the clamping groove 3 and clamped. The depth of the holding groove 3 is set to be equal to the width of the piece IA to be cut. Therefore, the other surface 1b of the glass plate 1 engaged with the holding groove 3 is placed at a position facing the edge 3a of the groove 3. The position of the glass facing the edge 3a is the desired cutting position 2a. Then, as shown in FIG. 1, the support member 5 is brought into contact with one surface 1a of the glass plate l to be separated, and the glass plate 1 held in the holding grooves 3 is held in place.
When the other piece IB of is pushed in the direction of arrow a, plate glass 1
The desired cutting position 2a is brought into contact with the edge 3a.

When the plate glass 1 is continued to be pushed, one glass surface 1a
A tensile stress acts on the edge 3a with the axis of the desired cutting position 2a in contact with the edge 3a, and when this reaches its limit, the plate glass 1 is cut with the line connecting the scratch 2 and the desired cutting position 2a as the cutting line. It is divided into IA and one part IBa. The support member 5 is moved by a drive means (not shown) and is adapted to hold the other divided piece IBa.

The edge 3a constitutes an axis forming member that forms the axis of the glass by bringing the desired cutting position 2a into contact with the edge 3a when generating tensile stress in the glass plate 1.

This edge 3a is required to uniformly contact the desired cutting position 2a on the other surface 1b of the temporary glass 1, and therefore requires highly accurate straightness. but.

If the flatness of the glass plate 1 is low or if a conductive layer or the like is formed on the glass surface, a desirable contact state cannot be obtained even if the straightness of the edge is highly accurate. Therefore, it is preferable to provide a thin film of soft material on at least one of the edge 3a as the axis forming member or the desired cutting position 2a. Examples of the soft material include tape and film, which can be attached to the edge, for example. .

Although the holding groove 3 shown in FIG. 1 is formed to have a fixed depth, it is of course possible to have a structure in which the depth of the groove can be changed depending on the width of one piece IA. be. Also, the second
As shown in the figure, the plate glass 1 that is pushed during cutting is tilted slightly within the groove 3, so strictly speaking, the depth of the groove 3 and the width of the piece IA are not equal. The depth and width of the groove 3 are set so that the desired cutting position 2a corresponding to the cutting position 2a and the edge 3a always come into contact at a predetermined position. Further, it is desirable that the support member 5 that contacts the surface 1a of the glass plate 1 with the scratches 2 contact the entire glass surface as uniformly as possible. If they contact unevenly, the contact pressure between the desired cutting position 2a and the edge 3a will become uneven, which will cause the cutting line to become disordered. Therefore, it is desirable to install a soft material on the pressing surface 5a of the support member 5.In addition to the above-mentioned tapes and films, general flexible materials such as a thin layer of flocked hair, felt, and sponge can be used as the soft material to be provided on the support member. That's fine.

In FIG. 3 a first example of a device suitable for carrying out the method described above is illustrated. In the same figure, reference numeral 40 denotes a holding groove 30a that holds one piece IA of the glass plate to be separated.
. . . shows a clamping means formed with... Clamping means 4
0 is provided to be rotatable and vertically movable around the support shaft 40a. The clamping means 40 is rotated in the direction of arrow d by a rotary drive means (not shown), and
It is moved in the direction of the arrow by a lifting mechanism (not shown).

Each holding groove 30a... is formed to have a depth approximately equal to the width of the piece IA to be cut. Furthermore, the edges 30a of the clamping grooves 30a, which come into contact with the desired cutting position of the plate, are formed with a predetermined straightness accuracy in the longitudinal direction of the glass (direction perpendicular to the plane of the paper), and material is pasted. On the other hand, there are scratches 2 on the sides of the holding means 40.
A support member 50 that supports the glass plate 1 with the attached glass plate 1 is movably disposed. This support member 50 is configured to be at a fixed position in the height direction and to be moved in the horizontal direction. The glass support surface 50a of the support member 50 is provided with a mechanism (not shown) for detachably holding the plate glass as well as measures to prevent the glass surface from being damaged. The support member 50 shown in FIG. 3 supports a plate glass in which a pattern such as a conductor layer is formed on the glass 1b, and the scratches 2 are made on the surface 1a.

The clamping means 40 shown in FIG.
It is stopped towards 0. In this state, when the supporting member 50 supporting the glass surface 1a with the scratch 2 facing downward moves in the direction of arrow C, the glass 1
inserts the piece IA into the holding groove 30a. Clamping means 4
The scratch 2 on the plate glass 1 that is held between the gripping grooves 30a
It is essential that it be located outside of the In other words, the depth of the clamping groove 30a... is the width of the piece IA to be cut out,
Strictly speaking, it is set according to the position of the scratch 2 made.

When the plate glass 1 is engaged with the clamping groove 30a, the clamping means 4
0 rises in the direction of the arrow while rotating in the direction of the arrow d.

In other words, the clamping means 40 is moved relative to the supporting means 50. When the clamping means 40 rotates and rises, tensile stress is applied to the surface 1a of the plate glass 1 where the scratch 2 has been made, and the cutting is performed between the scratch 2 and the edge 30aa that abuts the desired cutting position on the opposite surface 1b. 1iL(
As shown in FIG. 4, the clamping means 40, which rotates zero and is cut at the position (see FIG. 2), moves the clamping groove 30b to the next clamping position.

The rotation of the rotary drive means and the lifting action of the lifting mechanism are stopped,
The clamping groove 30a located at the lowest point releases the cut piece IA and allows it to fall by gravity. Thereafter, the support member 50 supporting the piece IB retreats in the direction of the arrow ac force in order to replace the piece IB with the glass plate 1 to be cut next. On the other hand, the holding means 40
is lowered in the direction of the arrow bb force by the action of the elevating means to return to the home position shown in FIG. In the embodiment shown in FIG. 3, it is possible to cut the glass by fixing the supporting member 50 and moving only the glass plate 1 by appropriate means, but the scratches 2 and edges In order to secure the relative position of the pattern, it is desirable to install a holding means that does not damage the pattern on one surface lb.

The embodiment shown in Part 3 is an apparatus for cutting a plate glass having a pattern formed on its upper surface 1b and scratches 2 on its lower surface 1a. An example of a device for cutting, that is, a second example of the device will be described.

In FIG. 5, a pattern such as a conductive layer (not shown) is formed on the surface 1b of the plate glass 1, and this surface 1
There is also scratch 2 on b. This plate glass 1 is placed on the upper surface of the support member 50A with its pattern surface 1b facing upward. Above the fixed support member 50A,
A pressing member 50B, which forms a pair with the supporting member and constitutes supporting means for supporting the glass piece, is arranged to be vertically movable. The aforementioned soft material is provided on the lower surface 50Ba of this holding member 50B so as not to damage the pattern on the surface 1b of the plate glass. On the other hand, the holding means 40 is rotated in the direction of the arrow d by a rotation drive mechanism (not shown), and is lowered and raised in the direction indicated by the arrow by an elevating mechanism (also not shown).

The operation of this embodiment will be explained based on FIGS. 5 to 7. The clamping means 40 is as shown in FIG.

When the holding member 50B is stopped and waiting at a position where the holding groove 30a is directed toward the upper surface side of the support member 50A, the holding member 50B
It is placed in an elevated position as shown in the figure.

In this state, the plate glass 1 is moved on the support member in the direction of arrow C with the surface 1b where the scratch 2 is made facing upward, and one piece IA thereof is brought into engagement with the clamping groove 30a. The depth of the groove 30a is such that the engaged MI2 of the glass is located outside the groove. When the movement of the glass plate 1 is finished, the holding member 50B moves in the direction of arrow e to press and support the other piece IB of the glass plate against the support member 50A. After supporting the glass plate 1, the holding means 40 moves in the direction of arrow B while rotating in the direction of arrow d. Clamping means 4
By this movement relative to the support means of 0, the glass sheet 1 is subjected to a tensile stress on its surface 1b. If this tensile stress exceeds a predetermined limit, the glass plate 1 will be damaged by scratches 2.
It is broken along a cutting line (see reference numerals in FIG. 2) connecting the desired cutting position where the edge 30aa abuts, and is divided into pieces IA and IB.

When the piece IA is cut, the clamping means 40 turns upward in the force direction of arrow bb while continuing to rotate. On the other hand, the pressing member 50
B rises in the direction of the force indicated by arrow ee and releases the support of the piece of glass IB. The piece IA of the plate glass whose support has been released is moved in the direction of the arrow QC and removed from the support member 50A. When the clamping means 40 returns to the home position (in the ascending and descending direction) shown in FIG. 5, its rotation is stopped and it stands by in preparation for cutting the next plate glass. Cut piece IA
falls due to gravity when the clamping means 40 rotates and its clamping groove 30a reaches the lowest position as shown in FIG.

The timing for removing this piece IA from the clamping means 40 may be determined by rotating the clamping means 270 degrees from the home position and dropping it every time it is cut, or by removing the piece IA of the same width from the clamping means 40.
If the piece is to be cut continuously, the holding means 40 should be rotated 90 degrees each time the piece is cut, and when the groove holding the piece being cut reaches its lowest position, You can also release it.

Although the clamping grooves formed in the clamping means 40 of the embodiment described above have the same depth, the depths of the grooves 30a, 30b, etc. are changed depending on the width of the glass piece to be cut. Accordingly, it is also possible to construct a structure that allows cutting of glass pieces of different widths. Moreover, it is of course applicable to cutting not only plate glass but also plate-shaped ceramics.

(Effects of the Invention) As described above, according to the sheet glass cutting method of the present invention, at least one side (area) of the sheet glass that is damaged by scratches.

This method applies tensile stress to the scratched part centered on the desired cutting position on the opposite side of the scratched glass piece. This can also be cut reliably.

Further, according to the plate glass cutting device of the present invention, the scratched plate glass is held by the holding means and the supporting means, and the both are moved relative to each other to apply tensile stress to the scratched portion. A uniform stress is applied along the scratch, making it possible to cut a glass piece of small area and width, and the cutting line becomes smooth.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram illustrating the basic structure for implementing the plate glass cutting method of the present invention, Fig. 2 is a partially enlarged view of Fig. 1, and Fig. 3 is an implementation of the plate glass cutting apparatus of the present invention. FIG. 4 is a front view showing an example, FIG. 4 is an operational view of FIG. 3, FIG. 5 is a front view showing a second embodiment of the present invention, FIG. 6 is an operational view of FIG. It is a time chart showing the effect of the second embodiment. 1... Plate glass, 2... Scratch, IA... One side,
IB...other surface, 4, 40... clamping means. 3a, 30aa...edge as an axis forming member, 5
0, 50A, 50B...Support means. Fig. 1 Fig. 2 Fig. 5 Fig. 6 Fig. IA Fig. 7 Comfortable holding means #dosha offing

Claims (1)

[Scope of Claims] 1. In a plate glass cutting method in which a plate glass is mechanically cut by making a scratch on one side of the plate glass and applying tensile stress to the scratched part, at least A method for cutting plate glass in which one piece is held between the two sides and the plate glass is pushed around the desired cutting position on the other surface of the scratched plate glass as an axis to apply tensile stress to the scratched part to cut the plate glass. 2. A clamping means that clamps at least one piece of the plate glass that is divided into two parts by the scratched part, and an axis forming that is brought into contact with the desired cutting position on the opposite side of the scratched surface of the plate glass. a member, a support means that is in contact with the scratched surface of the glass plate and supports the other piece of the glass plate that is divided into two parts, and a support means that holds the holding member and the support member relative to each other about the axis forming member. A plate glass cutting device comprising a driving means for moving and applying tensile stress to scratches on the plate glass.