JP2765488B2 - Sheet glass cutting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet glass cutting apparatus for breaking a glass plate having a cutting groove formed on one surface thereof in advance at the cutting groove.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 1-246155 discloses a sheet glass cutting apparatus for cutting a glass plate having a cutting groove formed on one surface in advance at the cutting groove.
As shown in FIG. 5, the sheet glass cutting device 100 includes a lower receiving roller 102 on which a sheet glass 101 is placed,
And a pressure roller 103 for pressing the plate glass 101 from above. The receiving roller 102 is wider than the sheet glass 101 and is made of a material having a smaller Young's modulus than the sheet glass 101. The sheet glass 101 is placed so that the cutting groove 104 is on the receiving roller 102 side. Pressure roller 10
Numeral 3 is narrower than the glass sheet 101 and presses the surface of the glass sheet 101 on the side opposite to the cutting groove 104.

[0003] A sheet glass 101 is conveyed while being sandwiched between a receiving roller 102 and a pressing roller 103, and cut by a cutting groove 10.
At the position 4, the pressing roller 103 is pressed. At this time, the elongation of the receiving roller 102 and the friction between the sheet glass 101 and the receiving roller 102 cause the sheet glass 101
In the cutting groove 104, stresses B and B 'along the axial direction of the receiving roller 102 are generated. When the receiving roller 102 is pressed by the pressing roller 103, the sheet glass 10 is pressed.
1 generate moments A and A ′. The sheet glass 101 is broken at the cutting groove 104 by these loads.

[0004]

The width w of the sheet glass 101
When the thickness w is sufficiently larger than the thickness t, the plate glass 101 can be cut by the plate glass cutting device 100 without any trouble. However, when the width w becomes 4 t or less, as shown in FIG. 6 or FIG. Crack 105 is cut groove 104
And the sheet glass 101 does not break along the cutting groove 104.

In general, a fluorescent display tube has an envelope in which plate glass is assembled in a box shape, and the plate glass constituting the envelope is formed by the above-described plate glass cutting apparatus. In recent years, since fluorescent display tubes have tended to be thin, it has been demanded that plate glass constituting the envelope, particularly a side plate, be small in height. For example, a sheet glass whose height is four times or less the sheet thickness t is required. As a specific example, if t = 2 mm, a plate glass having a height (width) of 8 mm or less, and if t = 1.5 mm, a plate glass having a height (width) of 6 mm or less is required. Sheet glass of such a size cannot be manufactured by the conventional sheet glass cutting apparatus due to the above-mentioned problems.

The inventors of the present invention have examined the causes of cracks coming off the cut grooves when breaking a sheet glass having a small width with respect to the sheet thickness from various angles, and as a result, have considered as follows. As shown in FIG. 6, if the angle θ formed between the surface of the broken portion of the plate glass 101 and the line of the upper end surface of the receiving roller 102 becomes too large, the receiving roller 102, the pressure roller 103, and the tip of the plate glass 101 , The bending moments A and A ′ applied to the glass sheet 101 become maximum. As shown in FIG. 7, the cut groove 104 in the section C has small and large cracks 10 in the lateral direction.
6 are present at the time of streaking, and these minute cracks 106
Grow due to the bending moment, and thus crack 105
May be displaced in a direction deviating from the cutting groove 104.

In the conventional sheet glass cutting apparatus 100, the interval between the receiving roller 102 and the pressure roller 103 is determined in accordance with the thickness t of the sheet glass 101 so that an appropriate pressure is applied to the sheet glass 101. Since the thickness of the sheet glass varies depending on the product, the force for pressing the sheet glass is not always constant even when the roller interval is set in this manner. Even if the roller interval is set in the best condition, if the sheet thickness changes, the pressing force of the pressing roller 103 against the sheet glass 101 also changes, and problems such as the cracked surface of the sheet glass 101 not being formed in a constant shape occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet glass cutting apparatus capable of breaking a sheet glass having a small width with respect to the sheet thickness without any trouble and coping with a change in the sheet thickness.

[0009]

According to a first aspect of the present invention, there is provided a sheet glass cutting apparatus comprising: a receiving roller contacting one surface of a sheet glass provided with a cutting groove; and a receiving roller contacting the other surface of the sheet glass. And a pressure roller that sandwiches the sheet glass, and in a sheet glass cutting device that cuts the glass sheet by moving the glass sheet between the receiving roller and the pressure roller, wherein the pressure roller is disposed on the other surface of the sheet glass. It is characterized in that it has a pressurizing portion to be brought into contact with, and a deformation adjusting portion provided on both sides of the pressurizing portion coaxially with the pressurizing portion and smaller in diameter than the pressurizing portion.

A sheet glass cutting apparatus according to a second aspect of the present invention is characterized in that, in the sheet glass cutting apparatus according to the first aspect, the deformation adjusting section is capable of adjusting an axial position.

According to a third aspect of the present invention, in the sheet glass cutting apparatus according to the first aspect, the deformation adjusting section is detachably configured so as to be exchangeable with another deformation adjusting section having a different diameter. It is characterized by:

According to a fourth aspect of the present invention, in the flat glass cutting apparatus according to the first aspect, the angle between the surface of the flat glass deformed at the time of cutting and the line of the upper end surface of the receiving roller contacting the flat glass is 11 degrees. The deformation adjusting unit is configured to be less than or equal to °.

According to a fifth aspect of the present invention, there is provided a sheet glass cutting apparatus comprising: a receiving roller contacting one surface of a sheet glass provided with a cutting groove; and a pressing roller contacting the other surface of the sheet glass and holding the sheet glass together with the receiving roller. In a glass cutting device that has a pressure roller and cuts a glass plate by moving a glass plate between a receiving roller and a pressure roller, the pressure roller includes a pressing unit that contacts the other surface of the plate glass. A deformation adjustment unit provided coaxially with the pressure unit on both sides of the pressure unit and having a smaller diameter than the pressure unit, and contacting at least one of the pressure roller or the receiving roller with a sheet glass. And a biasing means for causing the biasing means to be provided.

[0014]

According to the first to fifth aspects of the present invention, since the broken sheet glass comes into contact with the deformation adjusting sections provided on both sides of the pressing section of the pressing roller, no excessive bending moment is generated in the sheet glass. . In particular, according to the invention of claim 5, since at least one of the pressure roller and the receiving roller comes into contact with the sheet glass by the urging means, the sheet glass is pressed in an optimum state even if the sheet thickness of the sheet glass varies. be able to.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sheet glass cutting apparatus 1 according to a first embodiment will be described with reference to FIGS. The sheet glass cutting device 1 has a pair of rollers for holding and breaking a sheet glass 3 having a cutting groove 2 provided on one surface in advance. The lower receiving roller 4 that is in contact with the lower surface of the plate glass 3 provided with the cutting groove 2 is rotatably supported at both ends by a support shaft 5. The length of the receiving roller 4 in the axial direction is larger than the width of the plate glass 3. The receiving roller 4 is made of a material having a lower Young's modulus than the sheet glass 3, for example, an acrylic resin. The Young's modulus of glass is 7000 kgf / mm ² , and the Young's modulus of acrylic is 340 kgf / mm ² .

A pressure roller 6 is in contact with the upper surface of the glass sheet 3. The pressure roller 6 is driven to rotate by a motor 7.
The pressure roller 6 includes a deformation adjusting roller 8 as a deformation adjusting unit.
And a pressing rim 9 as a pressing portion provided at the center of the deformation adjusting roller 8. The axial dimension of the deformation adjusting roller 8 is longer than the width w of the glass sheet 3. Width H of pressure rim 9
(Axial dimension) should be narrower, preferably H ≦ (w /
It is desired to satisfy the condition of 5), and in this embodiment, 5 m
m, 4 mm, 3 mm, and 2 mm.

The outer diameter of the pressure rim 9 is larger than the outer diameter of the deformation adjusting roller 8, and half of the difference between the two is the height of the step of the pressure rim 9 shown in FIG. When the sheet glass 3 breaks and a bending moment is generated, the step d
As shown in (b), both side edges of the broken glass sheet 3 abut against the peripheral surface of the deformation adjusting roller 8, and the angle θ formed between the generatrix of the receiving roller 4 and the surface of the broken glass sheet 3 is 11 based on experimental results described later. ° or less. Since the angle θ varies depending on the thickness and width of the glass sheet 3, the dimension of the step d is appropriately set so that the angle θ is 11 ° or less.

The entire pressure roller 6 may be made of aluminum so that the deformation adjusting roller 8 and the pressure rim 9 are integrated. Alternatively, the pressure rim 9 may be made of aluminum, the deformation adjusting roller 8 may be made of acrylic, and the two may be fitted together to be integrally combined.

Each support shaft 5 of the receiving roller 4 is supported by a spring 10 as an urging means. This spring 1
The spring constant of 0 is determined according to the thickness of the glass sheet 3 and the degree of its variation. Receiving roller 4 urged by spring 10
Presses the plate glass 3 toward the pressure roller 6, so that the plate glass 3 is always held in a fixed state between the receiving roller 4 and the pressure roller 6 irrespective of a slight variation in the plate thickness,
Therefore, a constant pressing force is always applied to the glass sheet 3.

The plate glass 3 is sandwiched between the receiving roller 4 and the pressing roller 6 so that the cut groove 2 of the plate glass 3 contacts the peripheral surface of the receiving roller 4, and the motor 7 is driven to rotate the pressing roller 6. The sheet glass 3 is conveyed while being held between the receiving roller 4 and the pressure roller 6, and a certain force is applied to the sheet glass 3 by the pressure roller 6.

As described with reference to FIG. 5, the bending moments A and A 'act on the sheet glass 3, and the stresses B and B' act on the sheet glass 3 near the cut grooves 2.
Is being broken. At this time, since the angle θ between the generatrix of the receiving roller 4 and the surface of the broken glass sheet 3 is 11 ° or less, the crack 11 generated in the glass sheet 3 advances along the cutting groove 2 and breaks as expected and becomes a good product. Sheet glass 3 can be manufactured. The problem that the crack 11 advances in the direction deviating from the cutting groove 2 and the sheet glass 3 does not break along the cutting groove 2 does not occur.

In the apparatus of this embodiment, the angle θ is variously set by changing the dimensions and the like of the pressure rim 9 to the deformation adjusting roller 8, and the plate glass 3 is cut at each angle θ. Pass / fail was judged. Here, “defective” means that the crack comes off the cut groove 2 as shown in FIG. 6 or FIG. FIG. 3 is a graph showing the relationship between the angle θ and the defect rate. As shown in this result, when the angle θ exceeds 12 °, the defective rate starts to increase sharply. As described above, in the present embodiment, since the angle θ is set to 11 ° or less, no failure occurs.

Referring to FIG. 4A, a sheet glass cutting apparatus 21 according to a second embodiment will be described. The configuration of the receiving roller 4 of this embodiment is the same as that of the first embodiment. The pressing roller 26 according to the present embodiment is a rotary shaft 2 driven by a motor (not shown).
7. At the center of the rotating shaft 27, a pressure rim 29 as a pressure portion is provided. This pressure rim 29 is
It has the same configuration as the pressure rim 9 of the embodiment.

On both sides of the pressure rim 29, there are provided deformation adjusting rollers 28 as deformation adjusting portions. Each deformation adjusting roller 28 is movable along the axial direction of the rotating shaft 27 and can be fixed at an arbitrary position. Further, the deformation adjusting roller 28 can be detached from the rotating shaft 27, and another deformation adjusting roller having a different outer diameter can be attached instead.

Deformation adjusting roller 2 attached to rotating shaft 27
8 and the distance between the pressure rim 29 and the deformation adjusting roller 28, etc., are appropriately set according to the thickness and width of the glass sheet 3, and the angle θ is 11 ° or less. So that According to this embodiment, substantially the same effects as those of the first embodiment can be obtained.

A plate glass cutting device 31 according to a third embodiment will be described with reference to FIG. Receiving roller 34 of this embodiment
Are in contact with both ends of the lower surface of the glass sheet 3 where the cut grooves 2 are formed, and support the glass sheet 3. The pressure roller 36, which is driven to rotate by the rotation shaft 37, has a pressure portion 39 that contacts the center of the upper surface of the glass sheet 3, and a tapered deformation adjusting portion 38 provided on both sides of the pressure portion 39. doing. The shape of the deformation adjusting unit 38 is set so that the angle θ between the tapered surface of the deformation adjusting unit 38 and the surface of the sheet glass 3 before deformation is 11 ° or less.

According to the plate glass cutting apparatus 31 of this embodiment, the angle of bending of the sheet glass 3 is determined by the tapered surface of the deformation adjusting section 38, and the bent sheet glass 3 is stably supported by the tapered surface of the deformation adjusting section 38. Therefore, the sheet glass can be accurately bent at a predetermined bending angle and broken. The receiving roller 34 is a sheet glass 3
, The plate glass 3 pressed by the pressing portion 39 is easily broken.

In each of the embodiments described above, the receiving roller 4
Is urged toward the pressure rollers 6 and 26 by the spring 10, but the urging means is not limited to the spring. Further, the pressure roller 6,
26 may be urged toward the receiving roller 4 by the urging means. Further, urging means may be provided for each of the pressure rollers 6, 26 and the receiving roller 4, and both rollers may be urged in directions approaching each other to hold the glass sheet 3 with a predetermined force.

[0029]

According to the sheet glass cutting device of the present invention, the broken sheet glass comes into contact with the deformation adjusting portions provided on both sides of the pressing portion of the pressing roller, so that an excessive bending moment is generated in the sheet glass. Absent. Therefore, even a sheet glass having a width smaller than the sheet thickness, for example, a sheet glass having a width of 4 t or less with respect to the sheet thickness t can be split along the cut groove.

According to the plate glass cutting apparatus of the present invention, at least one of the pressure roller and the receiving roller comes into contact with the plate glass by the urging means, so that the plate glass can be optimized even if the thickness of the plate glass varies. Can be pressed in a proper state. Therefore, the sheet glass can be always broken under a constant condition, and the shape of the cut surface of the cut sheet glass is always constant.

[Brief description of the drawings]

FIG. 1A is a front view showing a structure of a first embodiment,
(B) is a front view showing an operation in the first embodiment.

FIG. 2 is a cross-sectional view taken along line AA of FIG. 1 (b).

FIG. 3 is a graph showing a relationship between an angle θ between a generating line of a receiving roller and a surface of a broken sheet glass and a defective rate of the cut sheet glass.

FIG. 4A is a front view showing a structure of a second embodiment, and FIG. 4B is a front view showing a structure of a third embodiment.

FIG. 5 is a front view showing the structure of a conventional sheet glass cutting apparatus.

FIG. 6 is a perspective view showing a problem in a conventional sheet glass cutting apparatus.

FIG. 7 is an enlarged perspective view of a sheet glass showing a conventional problem.

[Explanation of symbols]

 1,21,31 Sheet glass cutting device 2 Cutting groove 3 Sheet glass 4,34 Receiving roller 6,26,36 Pressure roller 8,28 Deformation adjustment roller 9,28 as deformation adjustment part With pressure rim 10 as pressure part Spring as urging means 38 Deformation adjusting unit 39 Pressing unit

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) C03B 33/033

Claims (5)

(57) [Claims] 1. A receiving roller which contacts one surface of a sheet glass provided with a cutting groove, and a pressure roller which contacts the other surface of the sheet glass and sandwiches the sheet glass together with the receiving roller. In a sheet glass cutting device that cuts a glass sheet by moving a glass sheet between pressure rollers, the pressure roller presses coaxially with the pressure unit that abuts on the other surface of the sheet glass. A plate glass cutting device, comprising: a deformation adjusting unit provided on both sides of the unit and having a smaller diameter than the pressing unit. 2. The sheet glass cutting apparatus according to claim 1, wherein the deformation adjusting unit is configured to adjust an axial position. 3. The sheet glass cutting apparatus according to claim 1, wherein the deformation adjusting section is detachably configured so as to be exchangeable with another deformation adjusting section having a different diameter. 4. The glass sheet cutting apparatus according to claim 1, wherein the deformation adjusting section is configured such that an angle formed between a surface of the glass sheet deformed at the time of cutting and a line of an upper end surface of the receiving roller contacting the glass sheet is 11 ° or less. apparatus. 5. A receiving roller which abuts on one surface of a sheet glass provided with a cutting groove, and a pressure roller which abuts on the other surface of the sheet glass and sandwiches the sheet glass together with the receiving roller. In a glass cutting apparatus for moving a glass sheet between pressure rollers to cut the glass sheet, the pressure roller is pressed coaxially with the pressure section, which is in contact with the other surface of the sheet glass. Provided on both sides of the unit, having a deformation adjusting unit having a smaller diameter than the pressing unit, and providing urging means for bringing at least one of the pressing roller and the receiving roller into contact with the sheet glass. Characteristic plate glass cutting equipment.