JP7097005B2 - Glass plate measuring device and manufacturing method of glass plate - Google Patents

Description

The present invention relates to a glass plate measuring device for measuring the squareness of the end face of a glass plate and a method for manufacturing the glass plate.

The manufacturing process of the glass plate includes a cutting step of cutting the glass plate to a predetermined size and an end face processing step of performing a finishing process such as chamfering on the cut end face of the glass plate.

In the end face processing step, the glass plate is generally positioned with reference to the cut end face, and in various steps after the end face processing step, the glass plate is generally positioned with reference to the finished end face.

Therefore, for example, for the purpose of performing accurate positioning, a shape measurement step of measuring the shape data of the glass plate including the squareness of the end face of the glass plate may be performed after the cutting step and the end face processing step. be.

As one of the methods for measuring the squareness of the glass plate, there is a method of photographing the four sides of the glass plate from above with a camera and analyzing the captured image (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2007-205724

However, the glass plate is often transparent except for some special glasses. Therefore, as disclosed in Patent Document 1, it is difficult to accurately detect the boundary between the side of the glass plate and its background by the method for measuring the squareness of the glass plate using image analysis, and an advanced image is obtained. There is a problem that analysis is required. In particular, such a problem becomes more prominent as the glass plate becomes thinner.

An object of the present invention is to easily and surely measure the squareness of the end face of a glass plate.

The present invention, which was devised to solve the above problems, is a glass plate measuring device for measuring the right angles of the first end surface and the second end surface intersecting at the corners of a rectangular glass plate, wherein the glass plate is used. A table with a mounting portion to be mounted, a first pin in contact with the first end surface, a second pin in contact with the second end surface, and a glass plate positioned on the mounting portion by the first pin and the second pin. The feature is that it is equipped with a distance meter that measures the actual displacement of the position of the second end face with respect to the reference position where the second end face is located when the first end face and the second end face are at right angles. do.

According to such a configuration, the glass plate is positioned on the mounting portion by the first pin and the second pin, and in this positioned state, the position of the second end surface of the glass plate is referred to by the range finder. Displacement from can be measured easily and reliably. Then, the inclination of the second end surface with respect to the first end surface indicating the squareness can be easily calculated based on the measured displacement.

In the above configuration, the rangefinder measures the displacement of the position of the second end face from the reference position between the position where the second pin contacts the second end face and the position where the second end face intersects the first end face. It is preferable to measure.

By doing so, the measurement position of the rangefinder approaches the corner portion, so that the fluctuation range from the reference position of the second end surface measured by the rangefinder becomes small. As a result, the measurement range of the rangefinder can be set small to improve the resolution, and it becomes easy to accurately measure the displacement of the second end face from the reference position.

In the above configuration, for calibration of the rangefinder, a calibration jig that can contact the first pin and the second pin and has a first guarantee surface and a second guarantee surface that are at right angles to each other, and a first guarantee surface. It is preferable to have a calibration rangefinder that measures the position of the second guaranteed surface together with the rangefinder in a state where the is in contact with the first pin.

It is very difficult to accurately install the calibration jig when calibrating the rangefinder, and the work requires skill. Therefore, a rangefinder for calibration is provided as described above, and with the first guarantee surface of the calibration jig in contact with the first pin, the rangefinder for the second guarantee surface of the calibration jig and for calibration are provided. Make sure that the values on the rangefinder match, and bring the second pin into contact with the second guarantee surface of the calibration jig. By doing so, the calibration jig can be installed easily and accurately. Then, if the position of the second guaranteed surface of the calibration jig installed in this way is measured with a range finder and the reference position (zero point) is corrected, the range finder can be calibrated correctly.

In this case, it is preferable that the calibration rangefinder is configured to be retractable from the second end surface of the glass plate.

By doing so, when measuring the second end surface of the glass plate with the distance meter, the calibration distance meter can be retracted from the second end surface of the glass plate and does not interfere with the measurement of the distance meter. As a method of retracting the calibration range finder, for example, the calibration range finder may be mounted on an advancing / retreating mechanism that holds the calibration range finder so that it can be moved forward and backward between the measurement position and the retracting position, or the calibration range finder may be removed from the table. Can be mentioned.

The present invention, which was devised to solve the above problems, is a method for manufacturing a glass plate, which comprises a measuring step of measuring the squareness of the end faces intersecting at the corners of the rectangular glass plate. A step of measuring the displacement of the position of the second end surface of the glass plate from the reference position by using a measuring device appropriately provided with the above configuration, and a second step with respect to the first end surface indicating a squareness based on the measured displacement. It is characterized by comprising a step of calculating the inclination of the end face.

According to such a configuration, the same effect as the corresponding configuration described above can be enjoyed.

According to the present invention, the squareness of the end face of the glass plate can be easily and surely measured.

It is a top view which shows the glass plate measuring apparatus which concerns on embodiment of this invention. It is sectional drawing of the 1st convex part in the lateral direction. (A) to (d) are sectional views in the lateral direction showing a modification of the first convex portion. FIG. 1 is a cross-sectional view taken along the line AA of FIG. 1 and is a cross-sectional view showing an example of a contact state between a straightedge and a roller of a copying mechanism. FIG. 1 is a sectional view taken along the line BB of FIG. 1 and is a diagram showing a preparatory step for placing a glass plate on a table using a mounting jig. It is a top view of the glass plate measuring apparatus which concerns on embodiment of this invention, and is the figure which shows the straightness measuring process which measures the straightness of the end face of a glass plate. FIG. 6 is a perspective view showing a state in which a weight is supported by a support member via a glass plate in the straightness measurement step of FIG. 6 is a cross-sectional view showing an example of a contact state between a contactor of a rangefinder and an end face of a glass plate in the straightness measurement step of FIG. It is a top view of the glass plate measuring apparatus which concerns on embodiment of this invention, and is the figure which shows the dimension measuring process which measures the dimension of a glass plate. It is a top view of the glass plate measuring apparatus which concerns on embodiment of this invention, and is the figure which shows the squareness measuring process which measures the squareness of a glass plate. It is a schematic diagram for demonstrating the method of obtaining the squareness from the measured value of the range finder in the squareness measuring process of FIG. It is a top view of the glass plate measuring apparatus which concerns on embodiment of this invention, and is the figure which shows the 1st calibration process which calibrates a dimension measuring meter using a calibration jig. FIG. 12 is a cross-sectional view taken along the line DD of FIG. 12 and is a diagram showing an arrangement mode of a calibration jig in the calibration process. FIG. 12 is a sectional view taken along the line CC of FIG. 12 showing the positional relationship between the support portion of the calibration jig and the glass plate in the height direction. It is a top view of the glass plate measuring apparatus which concerns on embodiment of this invention, and is the schematic diagram which shows the state of the early stage of the 2nd calibration process which calibrates a rangefinder using a calibration jig. It is a top view of the glass plate measuring apparatus which concerns on embodiment of this invention, and is the schematic diagram which shows the state of the final stage of the 2nd calibration process which calibrates a rangefinder using a calibration jig.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Note that XYZ in the figure is a Cartesian coordinate system. The X and Y directions are horizontal, and the Z direction is vertical.

As shown in FIG. 1, the glass plate measuring device 1 according to the present embodiment is a device for measuring shape data of a rectangular glass plate G. In the present embodiment, the glass plate measuring device 1 uses the straightness of at least one end surface Ga to Gd of the glass plate G, the vertical and horizontal dimensions (dimensions in the X direction and the dimensions in the Y direction) of the glass plate G, and the glass as shape data. The squareness of the end faces Ga to Gd intersecting at at least one corner portion G1 to G4 of the plate G is measured. That is, the glass plate measuring device 1 includes a straightness measuring device, a dimension measuring device, and a squareness measuring device.

(table)
The glass plate measuring device 1 includes a table 2 having a mounting portion 2x on which the glass plate G is mounted as a basic configuration. The glass plate G is placed on the mounting portion 2x of the table 2 so that the end faces Ga and Gb are substantially parallel to the X direction and the end faces Gc and Gd are substantially parallel to the Y direction.

Here, the thickness of the glass plate G is, for example, 0.2 to 10 mm, and the size of the glass plate G is, for example, 700 mm × 700 mm to 3000 mm × 3000 mm. The glass plate G is manufactured by a known method such as a down draw method (for example, an overflow down draw method) or a float method. The glass plate G is used, for example, as a substrate for a flat panel display such as a liquid crystal display or a cover glass for a touch panel or the like.

The mounting portion 2x may be formed from a single plane or a plurality of planes, but in the present embodiment, the first convex portion 2a and the second convex portion having a long contact portion in contact with the glass plate G are formed. A part 2b is provided.

The contact portion of the first ridge portion 2a extends along a pair of opposite end faces Ga, Gb of the glass plate G, that is, in the X direction, and the contact portion of the second ridge portion 2b faces the glass plate G. A pair of end faces Gc, Gd, that is, extending along the Y direction.

In this way, the contact portion of the first convex portion 2a becomes elongated along the X direction. Therefore, when the glass plate G is moved along the X direction, the first convex portion 2a becomes the glass plate G. On the other hand, it does not become a big resistance. Therefore, the glass plate G can be smoothly moved (sliding) in the X direction while the glass plate G is supported from below by the first convex portion 2a. Similarly, since the contact portion of the second convex portion 2b becomes elongated along the Y direction, the second convex portion 2b is larger than the glass plate G when the glass plate G is moved along the Y direction. It doesn't become a resistance. Therefore, the glass plate G can be smoothly moved (sliding) in the Y direction while the glass plate G is supported from below by the second convex portion 2b. Therefore, while the glass plate G is supported by the first convex portion 2a and the second convex portion 2b, the glass plate G can be smoothly moved in two different directions of the X direction and the Y direction for easy positioning. Can be done. Further, since the first ridge portion 2a and the second ridge portion 2b can have a smaller support area than the case where the entire surface of the glass plate G is supported by a surface, there is a case where a large-sized glass plate G is supported. However, it is possible to suppress an increase in cost due to an increase in the support area of the mounting portion 2x.

The first ridges 2a are provided at a plurality of locations in the Y direction at intervals in the X direction, and the second ridges 2b are provided at a plurality of locations in the X direction at intervals in the Y direction. There are multiple. That is, the first ridge portion 2a and the second ridge portion 2b are scattered on the table 2 at intervals so that the glass plate G can be supported in a stable posture.

The first ridge portion 2a and the second ridge portion 2b are detachably fixed to the table 2 by fasteners (not shown) such as screws. Therefore, any member of the plurality of ridges 2a and 2b can be individually replaced.

The arrangement mode of the first ridge portion 2a and the second ridge portion 2b is not particularly limited, and may be, for example, a regular arrangement such as a grid pattern or a staggered pattern. It may be a regular array. Further, the longitudinal direction of the contact portion of the first convex portion 2a and the longitudinal direction of the contact portion of the second convex portion 2b are not limited to the X direction and the Y direction, and may be different directions from each other. Further, another convex portion having a long contact portion may be further provided along a direction different from the convex portions 2a and 2b (for example, a direction formed by an angle of 45 ° with the X direction).

As shown in FIG. 2, the cross-sectional shape of the first convex portion 2a in the lateral direction (Y direction) is trapezoidal in consideration of the posture stability of the first convex portion 2a on the table 2. That is, the first ridge portion 2a has a wider bottom portion 2aa side than the upper portion 2ab side, and is fixed to the table 2 with the bottom portion 2aa grounded to the table 2. Here, the upper portion 2ab (contact portion with the glass plate G) of the first convex portion 2a may be a flat surface or a curved surface. Alternatively, the upper portion 2ab of the convex portion 2a may have a narrow width in the lateral direction to be linear. In this case, the cross-sectional shape of the first convex portion 2a in the lateral direction (Y direction) is, for example, triangular. Can be shaped. The cross-sectional shape of the first convex portion 2a in the lateral direction is not particularly limited and can be changed in various ways. For the first convex portion 2a, for example, a cross-sectional shape as shown in FIGS. 3A to 3D can be adopted. In FIG. 3A, the tip portion (glass plate G side) of the first convex portion 2a is trapezoidal, and the base end portion (table 2 side) is rectangular. In FIG. 3B, the first convex strip portion 2a has a semicircular shape whose tip portion constitutes a convex curved surface. In FIG. 3 (c), the first ridge portion 2a is a U-shape having two ridges arranged in parallel. In FIG. 3D, the first ridge portion 2a is brush-shaped, that is, the first ridge portion 2a may be composed of a brush. The cross-sectional shape of the second convex portion 2b in the lateral direction (X direction) is not particularly limited, but has the same shape as the cross-sectional shape of the first convex portion 2a in the lateral direction (Y direction). Can be adopted.

The contact portion of the first ridge portion 2a and the contact portion of the second ridge portion 2b are preferably made of a resin such as nylon. By doing so, the glass plate G becomes slippery on the ridges 2a and 2b. In this embodiment, the entire first ridge portion 2a and the second ridge portion 2b are made of resin.

The longitudinal dimension (X direction dimension) of the contact portion of the first convex portion 2a and the longitudinal dimension (Y direction dimension) of the contact portion of the second convex portion 2b shall be, for example, 0.2 to 20 mm. Is preferable. Further, the dimension of the contact portion of the first convex portion 2a in the lateral direction (dimension in the Y direction) and the dimension of the contact portion of the second convex portion 2b in the lateral direction (dimension in the X direction) are, for example, 5 to 400 mm. It is preferable to have.

As shown in FIG. 1, in the present embodiment, the mounting portion 2x further includes a plurality of columnar protrusions 2c. The protrusion 2c supports the glass plate G from below at its tip. The tip of the protrusion 2c may be provided with a float mechanism in order to facilitate the positioning of the glass plate G, but in the present embodiment, it is composed of a spherical roller. The protrusions 2c are scattered on the table 2 at intervals from each other. The arrangement of the protrusions 2c is not particularly limited, and may be, for example, a regular arrangement such as a grid pattern or a staggered arrangement, or an irregular arrangement. Further, the tip portion of the protrusion 2c may be a non-rolling body, and may have an arbitrary shape such as a convex curved surface or a flat surface.

(Straightness measuring device)
As shown in FIG. 1, the glass plate measuring device 1 has a distance meter 3, a holding mechanism 4, and a straightedge 5 as a configuration for measuring the straightness (straightness) of the end faces Ga to Gd of the glass plate G. And a copying mechanism 6 are provided on the table 2. Here, straightness means the magnitude of deviation from a geometrically correct straight line of a straight line shape.

The range finder 3 measures the distance to the end surface Ga of the glass plate G placed on the mounting portion 2x of the table 2, that is, the displacement of the end surface Ga of the glass plate G from the reference position. Here, in the present embodiment, the reference position is set to the position of both ends of the end surface Ga of the glass plate G in the X direction. That is, the rangefinder 3 is calibrated and the placement position of the glass plate G is adjusted so that the measured value of the rangefinder 3 shows zero at both ends of the end surface Ga of the glass plate G in the X direction.

The rangefinder 3 is a contact-type rangefinder (for example, a dial gauge) including a contactor 3a that comes into contact with the end face Ga to be measured and a spindle 3b that holds the contactor 3a so as to be able to move forward and backward in the Y direction. In the present embodiment, the contact 3a is a cylindrical roller and rolls while being in contact with the end surface Ga of the glass plate G (see FIG. 8 to be described later). Further, the contact 3a is urged to the end face Ga side of the measurement target, and can imitate the end face Ga of the measurement target. The contact 3a is, for example, a rolling element having a shape other than a cylindrical shape (for example, a spherical roller) or a non-rotating body sliding on the end surface Ga of the glass plate G (for example, a needle-shaped member or a cylindrical member). It may be.

The holding mechanism 4 movably holds the rangefinder 3 in the Y direction (direction away from the end surface Ga of the glass plate G) and the X direction (direction along the end surface Ga of the glass plate G).

The holding mechanism 4 has a first stage 4b that can move in the X direction along the rail 4a provided on the table 2 and a first stage 4b that can move in the Y direction along the rail 4c provided on the first stage 4b. It is equipped with two stages 4d. The first stage 4b can be manually or automatically moved in the X direction. A range finder 3 is mounted on the second stage 4d. The moving direction of the second stage 4d is parallel to the Y direction, but may have an angle with respect to the Y direction.

The holding mechanism 4 is provided on the table 2 and further includes a scale 4e indicating the position of the rangefinder 3 in the X direction. In the present embodiment, predetermined marks indicating the measurement position by the range finder 3 are attached at equal intervals on the scale 4e. The scale 4e may be arranged at any position, for example, on a straightedge 5. The scale 4e may be omitted.

The straightedge 5 is provided on the table 2 along the X direction. The straightedge of the straightedge 5 is measured and recorded in advance.

The copying mechanism 6 is a mechanism for making the rangefinder 3 attached to the holding mechanism 4 follow the straightedge 5. The copying mechanism 6 includes a pressing member 6a and a spring 6b.

The pressing member 6a has a base end portion attached to the second stage 4d so that the tip end portion comes into contact with the straightedge 5.

The spring 6b is provided straddling between the first stage 4b and the second stage 4d so as to draw the second stage 4d toward the straightedge 5. Since the pressing member 6a is pressed by the straightedge 5 by such an attractive force of the spring 6b, the position of the rangefinder 3 in the X direction is stabilized. The spring 6b may be provided so as to push the second stage 4d and bring it closer to the straightedge 5. Further, the spring 6b may be another elastic body such as rubber, or may be omitted.

As shown in FIG. 4, the pressing member 6a is provided with a cylindrical roller 6c at the tip end portion. The straightedge 5 includes a concave guide groove 5a that receives the roller 6c. That is, the roller 6c rolls on the straightedge 5 in a state of being received by the guide groove 5a. In the present embodiment, the straightness of the guide groove 5a is measured and recorded in advance as the straightedge of the straightedge 5. The tip of the pressing member 6a is, for example, a rolling element having a shape other than a cylindrical shape (for example, a spherical roller) or a non-rotating body sliding on a straightedge 5 (for example, a spherical member or a cylindrical member). There may be.

(Dimension measuring device)
As shown in FIG. 1, the glass plate measuring device 1 has a first pin 7, a second pin 8, and a first dimension measuring meter as a configuration for measuring the X-direction dimension and the Y-direction dimension of the glass plate G. 9 and a second dimension measuring meter 10 are provided on the table 2.

The first pin 7 comes into contact with the end surface Gc substantially parallel to the Y direction of the glass plate G mounted on the mounting portion 2x of the table 2. The second pin 8 comes into contact with the end surface Ga substantially parallel to the X direction of the glass plate G mounted on the mounting portion 2x of the table 2. That is, the second pin 8 comes into contact with the end face Ga that intersects the end face Gc with which the first pin 7 comes into contact at a substantially right angle.

The first dimension measuring meter 9 measures the dimension between the end faces Gc and Gd substantially parallel to the Y direction, that is, the dimension (first dimension) in the X direction of the glass plate G. The second dimension measuring meter 10 measures the dimension between the end faces Ga and Gb substantially parallel to the X direction, that is, the dimension in the Y direction (second dimension) of the glass plate G.

The first dimension measuring meter 9 is a contact type range finder (for example, a dial gauge) including a contact 9a that contacts the end face Gd and a spindle 9b that holds the contact 9a so as to be able to move forward and backward in the X direction. Similarly, the second dimension measuring meter 10 is a contact type rangefinder (for example, a dial gauge) including a contactor 10a that contacts the end face Gb and a spindle 10b that holds the contactor 10a so as to be able to move forward and backward in the Y direction. Is. In this embodiment, the contacts 9a and 10a are cylindrical non-rolling bodies. The contacts 9a and 10a may be, for example, a non-rolling body (for example, a spherical member or a needle-shaped member) having a shape other than the cylindrical shape, or a rolling body (for example, a cylindrical roller or a spherical roller).

The first dimension measuring meter 9 is provided on the first position adjusting mechanism F whose position in the X direction can be adjusted. Thereby, the position of the first dimension measuring meter 9 can be easily changed so that the glass plates G having different dimensions can be measured. Further, when measuring shape data other than the dimensions of the glass plate G, the first dimension measuring meter 9 can be retracted to a position where it does not get in the way. The first position adjusting mechanism F is not particularly limited as long as the position in the X direction of the first dimension measuring meter 9 can be adjusted, but in the present embodiment, the first rail Fa provided on the table 2 is used. , A first slider Fb that can move in the X direction along the first rail Fa. The first slider Fb can be manually or automatically moved in the X direction. A first dimension measuring meter 9 is mounted on the first slider Fb.

The second dimension measuring meter 10 is provided on the second position adjusting mechanism S whose position in the Y direction can be adjusted. Thereby, the position of the second dimension measuring meter 10 can be easily changed so that the glass plates G having different dimensions can be measured. Further, when measuring shape data other than the dimensions of the glass plate G, the second dimension measuring meter 10 can be retracted to a position where it does not get in the way. The second position adjusting mechanism S is not particularly limited as long as the position in the Y direction of the second dimension measuring meter 10 can be adjusted, but in the present embodiment, the second rail Sa provided on the table 2 and the second rail Sa. , A second slider Sb that can move in the Y direction along the second rail Sa. The second slider Sb can be manually or automatically moved in the Y direction. A second dimension measuring meter 10 is mounted on the second slider Sb.

Two sets of the first pin 7 and the first dimension measuring meter 9 are provided, and two sets of the second pin 8 and the second dimension measuring meter 10 are provided. That is, each of the X-direction dimension and the Y-direction dimension of the glass plate G is measured at two points. The X-direction dimension and the Y-direction dimension may be the average value of the two locations.

The first pin 7 and the contact 9a of the first dimension measuring instrument 9 that form a pair face each other in the X direction. That is, the first pin 7 and the contact 9a of the first dimension measuring meter 9 forming a set have substantially the same position in the Y direction. Similarly, the contacts 10a of the second pin 8 and the second dimension measuring meter 10 forming a pair face each other in the Y direction. That is, the contacts 10a of the second pin 8 and the second dimension measuring meter 10 forming the set have substantially the same position in the X direction.

The first pin 7 and the second pin 8 are detachably held on the table 2. In this embodiment, an engaging hole (not shown) for holding the pins 7 and 8 is provided on the table 2. It is preferable that the engaging holes are provided at a plurality of locations on the table 2 so that the mounting positions of the pins 7 and 8 can be adjusted when the size of the glass plate G is changed.

Either the first pin 7 and the first dimension measuring meter 9 forming a set, or the second pin 8 and the second dimension measuring meter 10 forming a set are omitted, and either the first dimension or the second dimension is omitted. It may be configured to measure only one of them. From the viewpoint of efficiently measuring the vertical and horizontal dimensions of the glass plate G, both the first pin 7 and the first dimension measuring meter 9 forming a set, and the second pin 8 and the second dimension measuring meter 10 forming a set. It is preferable to provide.

(Square angle measuring device)
As shown in FIG. 1, the glass plate measuring device 1 includes a first pin 11, a second pin 12, and a range finder 13 as a configuration for measuring the squareness of the end faces Ga to Gd of the glass plate G. Is provided on the table 2. Reference numeral 14 in the drawing is a calibration rangefinder for calibrating the rangefinder 13.

The first pin 11 comes into contact with an end surface Gc (first end surface) substantially parallel to the Y direction of the glass plate G placed on the mounting portion 2x of the table 2. The second pin 12 comes into contact with the end surface Gb (second end surface) substantially parallel to the X direction of the glass plate G placed on the mounting portion 2x of the table 2. That is, the first pin 11 and the second pin 12 are in contact with the end faces Gc and Gb intersecting at the corner portion G1 for which the squareness is to be measured, respectively.

The first pin 11 is composed of a pair of pins provided at intervals in the Y direction, and the second pin 12 is composed of a single pin provided only in the X direction. The end face Gc is held in parallel with the straight line connecting the pair of first pins 11 by coming into contact with the pair of first pins 11. That is, the end face Gc is held at a predetermined inclination set in advance. The second pin 12 comes into contact with the end face Gb while maintaining such an inclination of the end face Gc. As a result, the glass plate G is positioned by a total of three points, the pair of first pins 11 and the second pins 12.

The first pin 11 and the second pin 12 are detachably held on the table 2. In this embodiment, an engaging hole (not shown) for holding the pins 11 and 12 is provided on the table 2. It is preferable that the engaging holes are provided at a plurality of locations on the table 2 so that the mounting positions of the pins 11 and 12 can be adjusted when the size of the glass plate G is changed.

The distance meter 13 refers to a reference position (shown by a chain line in FIG. 11) at which the end face Gb is located when the end face Gc and the end face Gb are at right angles to the glass plate G positioned by the first pin 11 and the second pin 12. The displacement of the position of the actual end face Gb (the deviation in the Y direction from the reference position) with respect to the position) is measured.

The range finder 13 is a contact-type range finder (for example, a dial gauge) including a contactor 13a that comes into contact with the end face Gb and a spindle 13b that holds the contactor 13a so as to be able to move forward and backward in the Y direction. In this embodiment, the contactor 13a is a cylindrical non-rolling body. The contact 13a may be, for example, a non-rolling body (for example, a spherical member or a needle-shaped member) having a shape other than the cylindrical shape, or a rolling body (for example, a cylindrical roller or a spherical roller).

The range finder 13 is adapted to come into contact with the end face Gb at a position different from the position where the second pin 12 comes into contact with the end face Gb. In the present embodiment, the rangefinder 13 is adapted to come into contact with the end face Gb between the position where the second pin 12 contacts the end face Gb and the position where the end face Gb intersects the end face Gc.

Like the rangefinder 13, the calibration rangefinder 14 also has a contact type distance meter (for example, a contactor 14a that contacts the end face Gb and a spindle 14b that holds the contactor 14a so as to be able to move forward and backward in the Y direction). Dial gauge).

The calibration range finder 14 is adapted to come into contact with the end face Gb at a position different from the position where the second pin 12 and the range finder 13 come into contact with the end face Gb. In the present embodiment, the calibration range finder 14 is adapted to come into contact with the end face Gb between the position where the second pin 12 contacts the end face Gb and the position where the range finder 13 comes into contact with the end face Gb. ..

The rangefinders 13 and 14 are movably held in the Y direction by a holding mechanism (for example, a slide mechanism). As a result, the rangefinders 13 and 14 can be retracted to a position where they do not get in the way when measuring shape data other than the squareness of the glass plate G. Further, when the size of the glass plate G is changed, the positions of the rangefinders 13 and 14 can be easily adjusted.

(Mounting jig)
As shown in FIG. 1, the glass plate measuring device 1 includes a mounting jig 15 that supports the glass plate G from below as a configuration for mounting the glass plate G on the mounting portion 2x of the table 2. There is. The mounting jig 15 is a ladder-shaped member provided with an opening 15a through which the protrusions 2a and 2b and the protrusions 2c of the table 2 can be inserted. The mounting jig 15 is mounted on the table 2 after the glass plate G is replaced from the mounting jig 15 with the protrusions 2a and 2b and the protrusions 2c. The ridges 2a, 2b and / or the protrusions 2c may be provided on the outside of the opening 15a in addition to the inside of the opening 15a as long as they do not interfere with the mounting jig 15. The mounting jig 15 may be, for example, a grid-like member, and may have an arbitrary shape having an opening through which the protrusions 2a and 2b and the protrusions 2c can be inserted.

Next, a glass plate measuring method using the glass plate measuring device 1 configured as described above will be described.

The glass plate measuring method according to the present embodiment includes a preparatory step of placing the glass plate G on the mounting portion 2x of the table 2, a straightness measuring step of measuring the straightness of the end face of the glass plate G, and a glass plate G. A dimension measuring step for measuring the vertical and horizontal dimensions of the glass plate G and a squareness measuring step for measuring the squareness of the end face of the glass plate G are provided in this order. The order of these steps after the preparation step may be changed, for example, the dimension measurement step, the straightness measurement step, and the squareness measurement step are performed in this order.

(Preparation process)
As shown in FIG. 5, in the preparation step, first, the glass plate G is carried to the upper position of the table 2 in a state of being placed on the mounting jig 15 (the state shown by the chain line in the figure). Next, the mounting jig 15 is lowered from this state, and the protrusions 2a and 2b and the protrusions (spherical rollers) 2c of the mounting portion 2x of the table 2 are inserted into the opening 15a of the mounting jig 15. Let me. In this process, the glass plate G mounted on the mounting jig 15 is pushed up by the protrusions 2a, 2b and the protrusions 2c, and the glass plate G is pushed up from the mounting jig 15 to the protrusions 2a, 2b and protrusions. It is replaced with the part 2c. The mounting jig 15 is lower than the ridges 2a and 2b and the protrusions 2c when mounted on the table 2. Therefore, after the glass plate G is replaced from the mounting jig 15 to the protrusions 2a and 2b and the protrusions 2c, the mounting jig 15 can be mounted and accommodated on the table 2.

(Straightness measurement process)
As shown in FIG. 6, in the straightness measuring step, first, the glass plate G supported by the mounting portion 2x is positioned. In the present embodiment, the glass plate G is positioned so that one end in the X direction and the other end in the X direction of the end surface Ga of the glass plate G come to a predetermined reference position. Specifically, at the first position P1 and the second position P2 for measuring both ends of the end face Ga in the X direction, the glass plate G is provided so that the displacement from the reference position measured by the rangefinder 3 becomes zero. Position. In such positioning work of the glass plate G, when the rangefinder 3 is moved between the first position P1 and the second position P2, the contactor is used to prevent the contactor 3a of the rangefinder 3 from being worn. It is preferable that the 3a is retracted from the end surface Ga of the glass plate G. Next, with the glass plate G positioned, the weight 16 is placed on the glass plate G so that the glass plate G does not move. After that, the distance meter 3 is moved by a predetermined distance in the X direction by the holding mechanism 4 while confirming the position on the scale 4e, and the straightness of the end surface Ga of the glass plate G is measured. The weight 16 is removed from the top of the glass plate G when the straightness measuring step is completed.

As shown in FIG. 7, in the present embodiment, the weight 16 placed on the glass plate G is arranged near the end surface Ga of the glass plate G and along the end surface Ga (that is, a straightedge 5). On the table 2, a support member 17 that extends along the end surface Ga (that is, a straightedge 5) and supports the weight 16 via the glass plate G is arranged in the vicinity of the end surface Ga of the glass plate G. This prevents the vicinity of the end surface Ga of the glass plate G for measuring straightness from bending downward due to the load of the weight 16.

In the straightness measuring step, it is preferable that the pins 7, 8, 11 and 12 are removed from the table 2 and the dimension measuring meters 9 and 10 and the rangefinders 13 and 14 are retracted to a position where they do not get in the way. As a method of retracting the dimension measuring meters 9 and 10 and the rangefinders 13 and 14, for example, a method of retracting the entire dimension measuring meters 9 and 10 and the rangefinders 13 and 14 to the retracted position, and contacts 9a and 10a. , 13a, 14a alone can be retracted to the retracted position (state in FIG. 6).

As shown in FIG. 8, the contactor 3a of the rangefinder 3 is a cylindrical roller, and rolls while being in contact with the end surface Ga of the glass plate G. By doing so, as the contact 3a rotates, the portion of the contact 3a that comes into contact with the end surface Ga of the glass plate G changes in order, so that the wear of the contact 3a can be suppressed. Further, since the contact 3a is cylindrical, the displacement of the most protruding portion of the end surface Ga is always measured even when the end surface Ga of the glass plate G is inclined. Therefore, the measurement error of straightness by the rangefinder 3 becomes small. The rotation axis of the contact 3a is substantially parallel to the thickness direction (Z direction) of the glass plate G.

As shown in FIG. 6, since the position of the distance meter 3 in the Y direction is determined with reference to the straightedge 5, the displacement (straightness) of the end surface Ga of the glass plate G measured by the distance meter 3 is straight. Affected by the straightedge of ruler 5. Therefore, the difference (S1-S2) between the measured straightness S1 of the end surface Ga of the glass plate G and the straightness S2 of the known straightedge 5 is recorded as the final straightness of the end surface Ga of the glass plate G. Will be done.

After measuring the straightness of the end surface Ga of the glass plate G, it is preferable to measure the end surface Ga of the glass plate G again with the distance meter 3 at the positions P1 and P2 to confirm the presence or absence of the positional deviation of the glass plate G. That is, if the displacement from the reference position measured by the rangefinder 3 at both positions P1 and P2 is zero, it can be confirmed that there is no positional deviation in the glass plate G before and after the measurement.

In the above, the case of measuring the straightness of the end face Ga of the glass plate G has been illustrated, but it is preferable to measure the straightness of each of the four end faces Ga to Gd of the glass plate G. In this case, after measuring the straightness of the end face Ga of the glass plate G, the orientation of the glass plate G with respect to the table 2 is changed by the mounting jig 15 or other means, and the straightness of the remaining end faces Gb to Gd is determined. Measure in the same procedure. If the straightness of each of the four end faces Ga to Gd of the glass plate G is measured, for example, in the end face processing step included in the manufacturing process of the glass plate G, it is based on the straightness of each end face Ga to Gd of the glass plate G. The position of the machining tool can be adjusted accurately. Therefore, it becomes easy to process each end surface Ga to Gd of the glass plate G with a constant grinding amount. It should be noted that such a method of adjusting the position of the machining tool based on the straightness can also be applied to the case of performing constant pressure grinding.

(Dimension measurement process)
As shown in FIG. 9, in the dimension measurement step, first, the first pin 7 and the second pin 8 are brought into contact with the end faces Ga and Gc of the glass plate G, and the glass plate G supported by the mounting portion 2x is positioned. .. In this state, the contacts 9a and 10a of the dimension measuring meters 9 and 10 are brought into contact with the end faces Gb and Gd of the glass plate G, and the X-direction dimension and the Y-direction dimension of the glass plate G are measured. Since the contacts 9a and 10a of the dimension meters 9 and 10 are cylindrical, the positions of the most protruding portions of the end faces Gb and Gd of the glass plate G are measured in the same manner as the contacts 3a of the rangefinder 3.

The X-direction dimension and the Y-direction dimension of the glass plate G may be measured at the same time or separately. In the case of measuring separately, for example, the first pin 7 is brought into contact with the end face Gc of the glass plate G, the dimension of the glass plate G in the X direction is measured by the first dimension measuring meter 9, and then the first pin 7 is measured. The contact between the first dimension measuring meter 9 and the glass plate G is released, and the second pin 8 is brought into contact with the end face Ga of the glass plate G, and the dimension in the Y direction of the glass plate G is measured by the second dimension measuring meter 10. To measure.

In the present embodiment, each of the X-direction dimension and the Y-direction dimension is measured at two points, but the number of sets of the pin and the dimension measuring meter facing the pin can be changed as appropriate. That is, each of the X-direction dimension and the Y-direction dimension may be measured at only one point, or may be measured at three or more points.

In the dimension measurement step, it is preferable to retract the rangefinders 3, 13 and 14 to a position where they do not get in the way. As a method of retracting the rangefinders 3, 13 and 14, for example, a method of retracting the entire rangefinders 3, 13 and 14 to the retracted position, or a method of retracting only the contacts 3a, 13a and 14a to the retracted position. (The state of FIG. 9) and the like.

(Square angle measurement process)
As shown in FIG. 10, in the squareness measuring step, first, the first pin 11 and the second pin 12 are brought into contact with the end faces Gb and Gc of the glass plate G, and the glass plate G supported by the mounting portion 2x is positioned. do. In this state, the contactor 13a of the rangefinder 13 is brought into contact with the end surface Gb of the glass plate G, and the displacement of the end surface Gb from the reference position (displacement in the Y direction) is measured. Since the contactor 13a of the rangefinder 13 has a cylindrical shape, the position of the most protruding portion of the end surface Ga of the glass plate G is measured in the same manner as the contactor 3a of the rangefinder 3.

The displacement measured by the rangefinder 13 is converted into the inclination of the end surface Gb with respect to the vertical surface of the end surface Gc, and this inclination indicates the squareness. As shown in FIG. 11, the inclination (squareness) of the end face Gb with respect to the vertical plane of the end face Gc is, for example, Y from the position where the end face Gc and the end face Gb intersect to the position where the end face Gb and the end face Gb intersect. It is represented by the displacement M in the direction (= d1 × d3 / d2) or the angle θ (= tan ^-1 (d1 / d2)) formed by the vertical plane of the end face Gc and the end face Gb. Here, d1 is the displacement in the Y direction measured by the rangefinder 13, d2 is the X-direction distance between the known rangefinder 13 and the second pin 12, and d3 is the X-direction dimension of the known glass plate G. (Design value). The inclination of the end surface Gb with respect to the vertical surface of the end surface Gc may be automatically calculated by a calculation device from the displacement measured by the distance meter 13, or the displacement measured by the distance meter 13 may be converted into an inclination. A table may be created in advance and read from the conversion table.

By measuring the squareness in this way and controlling the squareness of the manufactured glass plate G, for example, alignment of the glass plate G (including the process of the delivery destination) such as processing, cleaning, and inspection (including the process of the delivery destination) ( It is possible to prevent misalignment of positioning).

In the above, the case of measuring the squareness of the end faces intersecting at the corners G1 of the glass plate G is illustrated, but all the squareness of the end faces intersecting at each of the four corners G1 to G4 of the glass plate G should be measured. You may do it. In this case, after measuring the squareness of the end faces intersecting at the corners G1 of the glass plate G, the orientation of the glass plate G with respect to the table 2 is changed by the mounting jig 15 or other means, and the remaining corners G2. The squareness of the end faces intersecting at G4 is measured by the same procedure.

In the squareness measuring step, it is preferable that the pins 7 and 8 are removed from the table 2 and the rangefinders 3 and 14 and the dimension measuring meters 9 and 10 are retracted to a position where they do not get in the way. As a method of retracting the rangefinders 3 and 14 and the dimension measuring meters 9 and 10, for example, a method of retracting the entire rangefinders 3 and 14 and the dimension measuring meters 9 and 10 to the retracting position, and contacts 3a and 9a. , 10a, 14a only, a method of retracting to the retracted position (state in FIG. 10) and the like can be mentioned.

(Calibration process)
In the glass plate measuring method according to the present embodiment, the first calibration step of calibrating the dimension measuring meters 9 and 10 used in the dimension measuring step and the distance meter 13 used in the squareness measurement are calibrated before the preparation step. It further includes a second calibration step. These calibration steps may be performed every time the glass plate G is measured, or may be performed after the glass plate G is measured a predetermined number of times or for a predetermined time. Further, it may be carried out when the size of the glass plate G to be measured changes. Of course, only the first calibration step may be carried out, or only the second calibration step may be carried out.

As shown in FIGS. 12 and 13, in the first calibration step, the rod-shaped first calibration jig 18 is used to calibrate the first dimension measuring meter 9, and the rod-shaped second calibration jig 19 is used to calibrate the second. Calibrate the dimensional meter 10. FIG. 12 shows a state in which the first dimension measuring meter 9 is calibrated using the first calibration jig 18 with a solid line, and a state in which the second dimension measuring meter 10 is calibrated using the second calibration jig 19 with a chain line. Shows. The calibration of the first dimension measuring meter 9 and the calibration of the second dimension measuring meter 10 are performed separately.

The lengths of the first calibration jig 18 and the second calibration jig 19 are known. In the present embodiment, the length of the first calibration jig 18 is set to the reference dimension (design dimension) of the X-direction dimension of the glass plate G, and the length of the second calibration jig 19 is the glass plate G. It is set to the standard dimension (design dimension) of the dimension in the Y direction. It is preferable to calibrate the calibration jigs 18 and 19 themselves on a regular basis (for example, about once a year).

When calibrating the first dimension measuring instrument 9, one end of the first calibration jig 18 is brought into contact with the first pin 7, and the other end of the first calibration jig 18 is brought into contact with the contact 9a of the first dimension measuring instrument 9. Let me. When calibrating the second dimension measuring instrument 10, one end of the second calibration jig 19 is brought into contact with the second pin 8, and the other end of the second calibration jig 19 is brought into contact with the contactor 10a of the second dimension measuring instrument 10. Let me.

The reference position (for example, zero point) of the first dimension measuring meter 9 is calibrated at the position where the contact 9a comes into contact with the first calibration jig 18, and the reference position (for example, zero point) of the second dimension measuring meter 10 is the contact. 10a is calibrated at a position where it comes into contact with the second calibration jig 19.

In the present embodiment, the first dimension measuring meter 9 measures the displacement of the end face Gd of the glass plate G from the reference position, and the second dimension measuring meter 10 measures the displacement of the end face Gb of the glass plate G from the reference position. Measure. That is, the sum of the reference dimension in each direction and the measured displacement (negative displacement when shorter than the reference dimension, positive displacement when longer than the reference dimension) is the X-direction dimension and the Y-direction of the glass plate G. Recorded as a dimension. Therefore, if the reference positions of the dimension measuring meters 9 and 10 are calibrated as described above, the measurement accuracy of the X-direction dimension and the Y-direction dimension is improved.

The first calibration jig 18 includes a small diameter portion 18a and a large diameter portion 18b having a diameter larger than that of the small diameter portion 18a. Similarly, the second calibration jig 19 includes a small diameter portion 19a and a large diameter portion 19b having a diameter larger than that of the small diameter portion 19a. The materials of the small diameter portions 18a, 19a and the large diameter portions 18b, 19b are not particularly limited, but in the present embodiment, the small diameter portions 18a, 19a are made of metal, and the large diameter portions 18b, 19b are rubber. Is formed of.

On the table 2, a first support portion 20 that supports the large diameter portion 18b of the first calibration jig 18 and a second support portion 21 that supports the large diameter portion 19b of the second calibration jig 19 are provided. There is. Semi-cylindrical concave grooves are formed on the upper surfaces of the support portions 20 and 21 to support the cylindrical large diameter portions 18b and 19b. By supporting the large diameter portions 18b and 19b of the calibration jigs 18 and 19 with the support portions 20 and 21, the heights of the calibration jigs 18 and 19 are automatically adjusted. Therefore, the calibration work of the dimension measuring meters 9 and 10 becomes easy.

The first support portion 20 and the second support portion 21 are lower than the mounting portion 2x of the table 2, that is, the protrusion portions 2a and 2b and the protrusion portion 2c. As a result, as shown in FIG. 14, these support portions 20 and 21 do not come into contact with the glass plate G mounted on the mounting portion 2x when the calibration work is not performed.

As shown in FIGS. 15 and 16, in the second calibration step, calibration having a first guarantee surface 22a and a second guarantee surface 22b that are in contact with the first pin 11 and the second pin 12 and are orthogonal to each other. A calibration distance meter 14 that measures the displacement of the position of the second guaranteed surface 22b from the reference position with the jig (for example, square) 22 and the first guaranteed surface 22a in contact with the first pin 11. Is used to calibrate the distance meter 13. It is preferable to calibrate the calibration jig 22 itself on a regular basis (for example, about once a year).

It is very difficult to accurately install the calibration jig 22 when calibrating the rangefinder 13, and the work requires skill. Therefore, with the first guarantee surface 22a of the calibration jig 22 in contact with the pair of first pins 11, the distance meter 13 and the calibration distance meter 14 with respect to the second guarantee surface 22b of the calibration jig 22. While confirming that the numerical values match, the calibration jig 22 is moved to the second pin 12 side (Y direction). By doing so, the second guarantee surface 22b of the calibration jig 22 can be brought into contact with the second pin 12 while the calibration jig 22 is maintained in the correct posture. As a result, the calibration jig 22 can be installed easily and accurately. Then, if the position of the second guaranteed surface 22b of the calibration jig 22 installed in this way is measured by the distance meter 13 and the reference position (zero point) is corrected, the distance meter 13 can be calibrated correctly.

After the second calibration step is completed, it is preferable that the calibration distance meter 14 is retracted to a position where it does not come into contact with the end surface Gb of the glass plate G. In this way, when the end face Gb of the glass plate G is measured by the range finder 13, the calibration range finder 14 does not interfere with the measurement of the range finder 13. At this time, the calibration distance meter 14 may be removed from the table 2 and retracted, in addition to the retracting by the method described above.

Here, the glass plate measuring method according to the present embodiment is carried out, for example, in the glass plate manufacturing process. The glass plate manufacturing process includes a molding process for forming a glass plate, a cutting process for cutting the formed glass plate to a predetermined size, and an end face processing process for performing a finishing process such as chamfering on the cut end face of the glass plate. And include. The glass plate measuring method is carried out, for example, after the cutting step and / or the end face processing step. In this case, as a measurement sample of the glass plate measuring method, one or a plurality of glass plates are extracted from the glass plates in the process of being manufactured. The extracted glass plate (measurement sample) is discarded after measuring the shape data, and is reused as, for example, a cullet.

As described above, according to the glass plate measuring device 1 according to the present embodiment, shape data including the straightness of the end face of the glass plate G, the vertical and horizontal dimensions, and the squareness of the end face can be obtained without using advanced image processing or the like. Easy and reliable measurement. Further, since all of these shape data of the glass plate G can be measured on the mounting portion 2x, space can be saved. Further, since the glass plate G is supported by the protrusions 2a and 2b and the protrusions 2c, even if the glass plate G has a large size, its positioning can be realized easily and at low cost.

The present invention is not limited to the above-described embodiment, and may be further implemented in various forms without departing from the gist of the present invention.

In the above embodiment, the case where the mounting portion 2x of the table 2 includes the convex portions 2a and 2b and the protruding portion 2c made of a spherical roller has been described, but the configuration of the mounting portion 2x is particularly high. The configuration is not limited, and the configuration may include only one of the protrusions 2a and 2b and the protrusions 2c.

In the above embodiment, the case where the straightness of the end face of the glass plate G is measured intermittently at a plurality of points on the end face has been described, but the straightness of the end face may be continuously measured. Similarly, the case where the dimensions of the glass plate G are measured at two points on one end face has been described, but the dimensions of the glass plate G may be measured at one point on the end face, three or more points, or along the end face. It may be measured continuously.

In the above embodiment, the case of measuring straightness, dimension, and squareness as the shape data of the glass plate G has been described, but the shape data is not limited to this. For example, the shape data may be squareness only and may include straightness or dimensions in addition to squareness. Further, other data such as the thickness and warpage of the glass plate G may be included.

In the above embodiment, the rangefinders 3, 13 and 14 and the dimension measuring meters 9 and 10 may be non-contact type rangefinders such as an optical type (for example, a laser rangefinder).

1 Glass plate measuring device 2 Table 2x Mounting part 2a First ridge part 2b Second ridge part 2c Protrusion part (spherical roller)
3 Rangefinder (for straightness measurement)
4 Holding mechanism 5 Straightedge 6 Copying mechanism 7 First pin (for dimension measurement)
8 Second pin (for dimension measurement)
9 First dimension measuring meter 10 Second dimension measuring meter 11 First pin (for squareness measurement)
12 Second pin (for squareness measurement)
13 Rangefinder (for squareness measurement)
14 Rangefinder for calibration 15 Mounting jig 16 Weight 17 Support member 18 First calibration jig (for dimension measurement)
19 Second calibration jig (for dimensional measurement)
20 First support part 21 Second support part 22 Calibration jig (for squareness measurement)
G Glass plate Ga to Gd End faces G1 to G4 Corner F First position adjustment mechanism S Second position adjustment mechanism

Claims (4)

A glass plate measuring device that measures the squareness of the first end surface and the second end surface that intersect at the corners of a rectangular glass plate.
A table having a mounting portion on which the glass plate is mounted,
The first pin in contact with the first end surface and
The second pin in contact with the second end surface and
With respect to the glass plate positioned on the above-mentioned mounting portion by the first pin and the second pin, with respect to the reference position where the second end surface is located when the first end surface and the second end surface are at right angles. A distance meter, which measures the actual displacement of the position of the second end face, is provided .
The rangefinder is located between the position where the second pin contacts the second end surface and the position where the second end surface intersects the first end surface, from the reference position of the position of the second end surface. A glass plate measuring device characterized by measuring displacement . For calibration of the rangefinder
A calibration jig that is in contact with the first pin and the second pin and has a first guarantee surface and a second guarantee surface that are at right angles to each other.
The first aspect of the present invention is characterized in that the calibration distance meter for measuring the position of the second guarantee surface together with the distance meter in a state where the first guarantee surface is in contact with the first pin is provided. The glass plate measuring device described. The glass plate measuring device according to claim 2 , wherein the calibration range finder is configured to be retractable from the second end surface of the glass plate. A method for manufacturing a glass plate, which comprises a measuring step of measuring the squareness of a first end surface and a second end surface intersecting at a corner of a rectangular glass plate.
The measuring step includes a step of measuring the displacement of the position of the second end surface from the reference position by using the measuring device according to any one of claims 1 to 3, and the measured displacement. A method for manufacturing a glass plate, comprising: a step of calculating an inclination of the second end surface with respect to the first end surface indicating the squareness based on the above.

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