Patent Publication Number: US-2023146769-A1

Title: Processing apparatus for brittle plate and processing method for brittle plate

Description:
TECHNICAL FIELD 
     The present invention relates to a processing apparatus for brittle plate, which grinds or polishes or grinds and polishes (hereinafter, referred to as processing) an outer peripheral edge of a rectangular brittle plate, for example, in the brittle plate for automobiles, for liquid crystal panels such as liquid crystal TV sets, for solar batteries, for furniture, for construction and the like and a processing method for brittle plate. 
     BACKGROUND ART 
     Conventionally, in a grinding device for a glass plate, for example, a grinding wheel is rotated by an operation of an electric motor and is brought into contact with a peripheral edge of the glass plate so as to grind the glass plate, for example. 
     CITATION LIST 
     Patent Literature 
     
         
         [Patent Literature 1] Japanese Patent Application Publication No. 2010-58265 
       
    
     SUMMARY OF INVENTION 
     Technical Problem 
     With the grinding device for a glass plate disclosed in the aforementioned Patent Literature 1, as a method for aligning a glass grinding position with a grinding wheel position at replacement of the grinding wheel or the like, a dimension from a grinding-wheel mounting surface to a reference position of grinding wheel groove is manually aligned in the grind wheel production, but with this method, a processed shape can be slightly shifted when the glass plate is processed. Thus, such a method is employed that the grinding wheel position is re-adjusted by checking the processed shape of the glass plate at first processing, which takes time to position the grinding wheel to the glass plate and lowers efficiency of the processing of the glass plate as a whole. 
     The present invention was made in view of the aforementioned problems and has an object to provide a processing apparatus for brittle plate and a processing method for brittle plate, which can reduce time and labor of manual positioning of a processing wheel with respect to the brittle plate after the replacement of the processing wheel and has high efficiency in processing of the brittle plate as a whole by automatically measuring a positional shift amount of the processing wheel before processing of the brittle plate without testing the positioning between the brittle plate and the processing wheel groove by a manual work several times, and by automatically correcting the positional shift of the processing wheel on the basis of the positional shift amount so as to cause the processing wheel whose positional shift was corrected to process the outer peripheral edge of the brittle plate. 
     Another object of the present invention is to provide a processing apparatus for brittle plate and a processing method for brittle plate, which can reduce time and labor of manual positioning of the processing wheel with respect to the brittle plate after the replacement of the processing wheel and has high efficiency in processing of the brittle plate as a whole by automatically measuring the positional shift amount of the processing wheel before the processing of the brittle plate, by automatically correcting the positional shift of the processing wheel on the basis of the positional shift amount, by alternately repeating the measurement and correction, and by automatically correcting the positional shift of the processing wheel with more accuracy so as to cause the processing wheel whose positional shift was corrected to process the outer peripheral edge of the brittle plate. 
     Solution to Problem 
     A first feature of the present invention in order to solve the aforementioned problem is characterized by that a processing apparatus for brittle plate includes a table which holds the brittle plate, a processing head having a processing wheel for processing an outer peripheral edge of the brittle plate held by the table, a measuring portion which measures a positional shift amount in an axis direction of the processing wheel with respect to the brittle plate, and a control portion which corrects a positional shift in the axis direction of the processing wheel on the basis of the positional shift amount in the axis direction of the processing wheel measured by the measuring portion and causes the processing wheel whose positional shift was corrected to process the outer peripheral edge of the brittle plate. 
     As an example of the processing apparatus for brittle plate of the present invention having the first feature, the measuring portion includes a mounting plate, a moving base provided capable of relative movement with respect to the mounting plate in a first direction orthogonal to an axis of the processing wheel, moving means for moving the moving base in the first direction, and rotating means provided on the moving base and having a shaft member including a distal end portion, in which 
     the measuring portion causes the shaft member to be rotated in a first rotating direction around a shaft thereof and causes the distal end portion to be brought into contact with the processing surface of the processing wheel, measures a first position where the distal end portion is rotated in the first rotating direction and is brought into contact with the processing surface of the processing wheel, causes the shaft member to be rotated in a second rotating direction which is a direction opposite to the first rotating direction and causes the distal end portion to be brought into contact with the processing surface of the processing wheel, and measures a second position where the distal end portion is rotated in the second rotating direction and is brought into contact with the processing surface of the processing wheel, and 
     the control portion calculates a first distance from a predetermined processing reference position to the first position in the axis direction of the processing wheel, calculates a second distance from the predetermined processing reference position to the second position in the axis direction of the processing wheel, calculates a positional shift amount in the axis direction of the processing wheel on the basis of the first distance and the second distance, corrects the positional shift in the axis direction of the processing wheel on the basis of the positional shift amount in the axis direction of the processing wheel, and causes the processing wheel whose positional shift was corrected to process an outer peripheral edge of the brittle plate. 
     As another example of the processing apparatus for brittle plate of the present invention having the first feature, the processing apparatus for brittle plate alternately repeats measurement of a first position and a second position by the measuring portion and correction of a positional shift in the axis direction of the processing wheel by the control portion several times and causes the processing wheel whose positional shift was corrected several times to process the outer peripheral edge of the brittle plate. 
     Another example of the processing apparatus for brittle plate of the present invention having the first feature is that the rotating means is a servomotor which controls a torque. 
     As another example of the processing apparatus for brittle plate of the present invention having the first feature, the measuring portion includes a mounting plate, a moving base provided capable of relative movement with respect to the mounting plate in a first direction orthogonal to the axis of the processing wheel, moving means for moving the moving base in the first direction, and laser measuring means provided on the moving base and measuring a processing surface by emitting a laser to the processing surface of the processing wheel, in which the control portion calculates a positional shift amount in the axis direction of the processing wheel from a predetermined processing reference position on the basis of a measured value measured by the laser measuring means, corrects the positional shift in the axis direction of the processing wheel on the basis of the positional shift amount from the predetermined processing reference position in the axis direction of the processing wheel, and causes the processing wheel whose positional shift was corrected to process the outer peripheral edge of the brittle plate. 
     As another example of the processing apparatus for brittle plate of the present invention having the first feature, in a state where a laser is emitted to the processing surface of the processing wheel, the laser measuring means measures the processing surface of the processing wheel by movement of at least either one of the processing wheel and the laser measuring means from one to the other in the axis direction of the processing wheel, and 
     the control portion calculates a positional shift amount in the axis direction of the processing wheel on the basis of a position where a distance from the laser measuring means to the processing surface of the processing wheel in the first direction measured by the laser measuring means becomes the maximum and the predetermined processing reference position, corrects the positional shift in the axis direction of the processing wheel on the basis of the positional shift amount in the axis direction of the processing wheel, and causes the processing wheel whose positional shift was corrected to process the outer peripheral edge of the brittle plate. 
     As another example of the processing apparatus for brittle plate of the present invention having the first feature, the laser measuring means measures the processing surface of the processing wheel by emitting a laser to a predetermined region or the entire region on the processing surface in the axis direction of the processing wheel and, and 
     the control portion calculates a positional shift amount in the axis direction of the processing wheel on the basis of a position where a distance from the laser measuring means to the processing surface of the processing wheel in the first direction measured by the laser measuring means becomes the maximum and the predetermined processing reference position, corrects the positional shift in the axis direction of the processing wheel on the basis of the positional shift amount in the axis direction of the processing wheel, and causes the processing wheel whose positional shift was corrected to process the outer peripheral edge of the brittle plate. 
     A second feature of the present invention for solving the aforementioned problem is a processing method for brittle plate using a processing apparatus for brittle plate, including a table which holds the brittle plate, a processing head having a processing wheel for processing an outer peripheral edge of the brittle plate held by the table, a measuring portion which measures a positional shift amount in an axis direction of the processing wheel with respect to the brittle plate, and a control portion which corrects a positional shift in the axis direction of the processing wheel on the basis of the positional shift amount in the axis direction of the processing wheel measured by the measuring portion and causes the processing wheel whose positional shift was corrected to process the outer peripheral edge of the brittle plate, 
     the processing method for brittle plate, including 
     a measuring process of measuring a positional shift amount in an axis direction of the processing wheel with respect to the brittle plate, 
     a correcting process of correcting a positional shift in the axis direction of the processing wheel on the basis of the positional shift amount measured in the measuring process, and 
     a processing process of causing the processing wheel whose positional shift was corrected after the correcting process to process an outer peripheral edge of the brittle plate. 
     A third feature of the present invention for solving the aforementioned problem is a processing method for brittle plate using a processing apparatus for brittle plate, including a table which holds the brittle plate, a processing head having a processing wheel for processing an outer peripheral edge of the brittle plate held by the table, a measuring portion which measures a positional shift amount in an axis direction of the processing wheel with respect to the brittle plate, and a control portion which corrects a positional shift in the axis direction of the processing wheel on the basis of the positional shift amount in the axis direction of the processing wheel measured by the measuring portion and causes the processing wheel whose positional shift was corrected to process the outer peripheral edge of the brittle plate, the measuring portion including a mounting plate, a moving base provided capable of relative movement with respect to the mounting plate in a first direction orthogonal to the axis of the processing wheel, moving means for moving the moving base in the first direction, and rotating means provided on the moving base and having a shaft member including a distal end portion, 
     the processing method for brittle plate, including 
     a positioning process of positioning the shaft member to a predetermined position, 
     a first measuring process of bringing the distal end portion into contact with the processing surface of the processing wheel by rotating the shaft member in a first rotating direction around a shaft thereof and of measuring a first position on the processing surface of the processing wheel with which the distal end portion is brought into contact, 
     a second measuring process of bringing the distal end portion into contact with the processing surface of the processing wheel by rotating the shaft member in a second rotating direction which is a direction opposite to the first rotating direction and of measuring a second position on the processing surface of the processing wheel with which the distal end portion is brought into contact, 
     a calculating process of calculating a first distance in the axis direction of the processing wheel from a predetermined processing reference position to the first position, of calculating a second distance in the axis direction of the processing wheel from the predetermined processing reference position to the second position and of calculating a positional shift amount in the axis direction of the processing wheel on the basis of the first distance and the second distance, 
     a correcting process of correcting the positional shift in the axis direction of the processing wheel on the basis of the positional shift amount in the axis direction of the processing wheel, and 
     a processing process of causing the processing wheel whose positional shift was corrected after the correcting process to process an outer peripheral edge of the brittle plate. 
     As an example of the processing apparatus for brittle plate of the present invention having the third feature, the processing method for brittle plate repeats the first measuring process, the second measuring process, the calculating process, and the correcting process several times, and the processing wheel whose positional shift was corrected several times is caused to process the outer peripheral edge of the brittle plate. 
     A fourth feature of the present invention for solving the aforementioned problem is a processing method for brittle plate using a processing apparatus for brittle plate, including a table which holds the brittle plate, a processing head having a processing wheel for processing an outer peripheral edge of the brittle plate held by the table, a measuring portion which measures a positional shift amount in an axis direction of the processing wheel with respect to the brittle plate, and a control portion which corrects a positional shift in the axis direction of the processing wheel on the basis of the positional shift amount in the axis direction of the processing wheel measured by the measuring portion and causes the processing wheel whose positional shift was corrected to process the outer peripheral edge of the brittle plate, the measuring portion including a mounting plate, a moving base provided capable of relative movement with respect to the mounting plate in a first direction orthogonal to the axis of the processing wheel, moving means for moving the moving base in the first direction, and laser measuring means provided on the moving base and measuring a processing surface by emitting a laser to the processing surface of the processing wheel, 
     the processing method for brittle plate, including 
     a positioning process of positioning the laser measuring means to a predetermined position, 
     a measuring process of measuring the processing surface of the processing wheel by emitting the laser beam of the laser measuring means to the processing surface of the processing wheel, 
     a calculating process of calculating a positional shift amount in the axis direction of the processing wheel on the basis of a measured value measured by the laser measuring means, 
     a correcting process of correcting the positional shift in the axis direction of the processing wheel on the basis of the positional shift amount in the axis direction of the processing wheel, and 
     a processing process of causing the processing wheel whose positional shift was corrected after the correcting process to process an outer peripheral edge of the brittle plate. 
     As an example of the processing apparatus for brittle plate of the present invention having the fourth feature, 
     in the measuring process, in a state where the laser measuring means emits a laser to the processing surface of the processing wheel, the processing surface of the processing wheel is measured by movement of at least either one of the processing wheel and the laser measuring means from one to the other in the axis direction of the processing wheel, and 
     in the calculating process, a positional shift amount in the axis direction of the processing wheel is calculated on the basis of a position where a distance from the laser measuring means to the processing surface of the processing wheel in the first direction measured by the laser measuring means becomes the maximum and a predetermined processing reference position. 
     As another example of the processing apparatus for brittle plate of the present invention having the fourth feature, in the measuring process, the processing surface of the processing wheel is measured by the laser measuring means by emitting a laser to a predetermined region or the entire region on the processing surface in the axis direction of the processing wheel, and 
     in the calculating process, on the basis of the position where the distance from the laser measuring means to the processing surface of the processing wheel in the first direction measured by the laser measuring means becomes the maximum and the predetermined processing reference position, the positional shift amount in the axis direction of the processing wheel is calculated. 
     Advantageous Effect of Invention 
     According to the processing apparatus for brittle plate having the first feature, since the measuring portion measures the positional shift amount in the axis direction of the processing wheel with respect to the brittle plate, and the control portion corrects the positional shift in the axis direction of the processing wheel on the basis of the positional shift amount in the axis direction of the processing wheel measured by the measuring portion and causes the processing wheel whose positional shift was corrected to process the outer peripheral edge of the brittle plate, such a processing apparatus for brittle plate can be provided that, without a need to test the positioning by a manual work between the brittle plate and the processing wheel groove several times, the labor and time for the manual positioning of the processing wheel with respect to the brittle plate after the replacement of the processing wheel can be reduced, and efficiency of the processing of the brittle plate is high as a whole. 
     According to the one processing apparatus for brittle plate having the first feature, since the control portion calculates the first distance from the predetermined processing reference position to the first position in the axis direction of the processing wheel, calculates the second distance from the predetermined processing reference position to the second position in the axis direction of the processing wheel, calculates the positional shift amount in the axis direction of the processing wheel on the basis of the first distance and the second distance, corrects the positional shift in the axis direction of the processing wheel on the basis of the positional shift amount in the axis direction of the processing wheel, and causes the processing wheel whose positional shift was corrected to process the outer peripheral edge of the brittle plate, such a processing apparatus for brittle plate can be provided that, without a need to test the positioning by a manual work between the brittle plate and the processing wheel groove several times, the labor and time for the manual positioning of the processing wheel with respect to the brittle plate after the replacement of the processing wheel can be reduced, and efficiency of the processing of the brittle plate is high as a whole. 
     According to another processing apparatus for brittle plate having the first feature, by alternately repeating the measurement of the first position and the second position by the measuring portion and the correction of the positional shift in the axis direction of the processing wheel by the control portion several times, since the positional shift of the processing wheel is automatically corrected with more accuracy, and the processing wheel whose positional shift was corrected is caused to process the outer peripheral edge of the brittle plate, such a processing apparatus for brittle plate can be provided that, the labor and time for the manual positioning of the processing wheel with respect to the brittle plate after the replacement of the processing wheel can be reduced, and efficiency of the processing of the brittle plate is high as a whole. 
     According to another processing apparatus for brittle plate having the first feature, since the rotating means is a servomotor which controls a torque, at a position where the distal end portion of the shaft member is in contact with the processing surface, a rotation (angle) of the rotating means can be controlled and reliably stopped and thus, the positional shift amount of the processing wheel can be measured with more accuracy, and the positional shift of the processing wheel can be corrected with accuracy. 
     According to another processing apparatus for brittle plate having the first feature, since the control portion calculates the positional shift amount from the predetermined processing reference position in the axis direction of the processing wheel on the basis of the measured value measured by the laser measuring means, corrects the positional shift in the axis direction of the processing wheel on the basis of the positional shift amount from the predetermined processing reference position in the axis direction of the processing wheel, and causes the processing wheel whose positional shift was corrected to process the outer peripheral edge of the brittle plate, such a processing apparatus for brittle plate can be provided that, without a need to test the positioning by a manual work between the brittle plate and the processing wheel groove several times, the labor and time for the manual positioning of the processing wheel with respect to the brittle plate after the replacement of the processing wheel can be reduced, and efficiency of the processing of the brittle plate is high as a whole. 
     According to another processing apparatus for brittle plate having the first feature, in the state where the laser measuring means emits a laser to the processing surface of the processing wheel, the laser measuring means measures the processing surface of the processing wheel by movement of at least either one of the processing wheel and the laser measuring means from one to the other in the axis direction of the processing wheel, and the control portion calculates the positional shift amount in the axis direction of the processing wheel on the basis of the position where the distance from the laser measuring means to the processing surface of the processing wheel in the first direction measured by the laser measuring means becomes the maximum and the predetermined processing reference position, corrects the positional shift in the axis direction of the processing wheel on the basis of the positional shift amount in the axis direction of the processing wheel, and causes the processing wheel whose positional shift was corrected to process the outer peripheral edge of the brittle plate and thus, such a processing apparatus for brittle plate can be provided that, without a need to test the positioning by a manual work between the brittle plate and the processing wheel groove several times, the labor and time for the manual positioning of the processing wheel with respect to the brittle plate after the replacement of the processing wheel can be reduced, and efficiency of the processing of the brittle plate is high as a whole. 
     According to another processing apparatus for brittle plate having the first feature, since the laser measuring means measures the processing surface of the processing wheel by emitting a laser to the predetermined region or the entire region on the processing surface in the axis direction of the processing wheel, and the control portion calculates the positional shift amount in the axis direction of the processing wheel on the basis of the position where the distance from the laser measuring means to the processing surface of the processing wheel in the first direction measured by the laser measuring means becomes the maximum and the predetermined processing reference position, corrects the positional shift in the axis direction of the processing wheel on the basis of the positional shift amount in the axis direction of the processing wheel, and causes the processing wheel whose positional shift was corrected to process the outer peripheral edge of the brittle plate, such a processing apparatus for brittle plate can be provided that, without a need to test the positioning by a manual work between the brittle plate and the processing wheel groove several times, the labor and time for the manual positioning of the processing wheel with respect to the brittle plate after the replacement of the processing wheel can be reduced, and efficiency of the processing of the brittle plate is high as a whole. 
     According to the processing method for brittle plate having the second feature, since the processing method for brittle plate includes the measuring process of measuring the positional shift amount in the axis direction of the processing wheel with respect to the brittle plate, the correcting process of correcting the positional shift in the axis direction of the processing wheel on the basis of the positional shift amount measured in the measuring process, and the processing process of causing the processing wheel whose positional shift was corrected after the correcting process to process the outer peripheral edge of the brittle plate, such a processing method for brittle plate can be provided that, without a need to test the positioning by a manual work between the brittle plate and the processing wheel groove several times, the labor and time for the manual positioning of the processing wheel with respect to the brittle plate after the replacement of the processing wheel can be reduced, and efficiency of the processing of the brittle plate is high as a whole. 
     According to the processing method for brittle plate having the third feature, since the processing method for brittle plate includes the positioning process of positioning the shaft member to the predetermined position, the first measuring process of bringing the distal end portion into contact with the processing surface of the processing wheel by rotating the shaft member in the first rotating direction around the shaft thereof and of measuring the first position on the processing surface of the processing wheel with which the distal end portion is brought into contact, the second measuring process of bringing the distal end portion into contact with the processing surface of the processing wheel by rotating the shaft member in the second rotating direction which is the direction opposite to the first rotating direction and of measuring the second position on the processing surface of the processing wheel with which the distal end portion is brought into contact, the calculating process of calculating the first distance in the axis direction of the processing wheel from the predetermined processing reference position to the first position, of calculating the second distance in the axis direction of the processing wheel from the predetermined processing reference position to the second position, and of calculating the positional shift amount in the axis direction of the processing wheel on the basis of the first distance and the second distance, the correcting process of correcting the positional shift in the axis direction of the processing wheel on the basis of the positional shift amount in the axis direction of the processing wheel, and the processing process of causing the processing wheel whose positional shift was corrected after the correcting process to process the outer peripheral edge of the brittle plate, such a processing method for brittle plate can be provided that, without a need to test the positioning by a manual work between the brittle plate and the processing wheel groove several times, the labor and time for the manual positioning of the processing wheel with respect to the brittle plate after the replacement of the processing wheel can be reduced, and efficiency of the processing of the brittle plate is high as a whole. 
     According to the one processing method for brittle plate having the third feature, since the processing method for brittle plate repeats the first measuring process, the second measuring process, the calculating process, and the correcting process several times so that the positional shift of the processing wheel can be automatically corrected with more accuracy, and the processing wheel whose positional shift was corrected several times is caused to process the outer peripheral edge of the brittle plate, such a processing method for brittle plate can be provided that the labor and time for the manual positioning of the processing wheel with respect to the brittle plate after the replacement of the processing wheel can be reduced, and efficiency of the processing of the brittle plate is high as a whole. 
     According to the processing method for brittle plate having the fourth feature, since the processing method for brittle plate includes the positioning process of positioning the laser measuring means to the predetermined position, the measuring process of measuring the processing surface of the processing wheel by emitting the laser beam of the laser measuring means to the processing surface of the processing wheel, the calculating process of calculating the positional shift amount in the axis direction of the processing wheel on the basis of the measured value measured by the laser measuring means, the correcting process of correcting the positional shift in the axis direction of the processing wheel on the basis of the positional shift amount in the axis direction of the processing wheel, and the processing process of causing the processing wheel whose positional shift was corrected after the correcting process to process the outer peripheral edge of the brittle plate, such a processing method for brittle plate can be provided that, without a need to test the positioning by a manual work between the brittle plate and the processing wheel groove several times, the labor and time for the manual positioning of the processing wheel with respect to the brittle plate after the replacement of the processing wheel can be reduced, and efficiency of the processing of the brittle plate is high as a whole. 
     According to the one processing method for brittle plate having the fourth feature, since in the measuring process, in the state where the laser measuring means emits a laser to the processing surface of the processing wheel, the processing surface of the processing wheel is measured by movement of at least either one of the processing wheel and the laser measuring means from one to the other in the axis direction of the processing wheel, and in the calculating process, the positional shift amount in the axis direction of the processing wheel is calculated on the basis of the position where the distance from the laser measuring means to the processing surface of the processing wheel in the first direction measured by the laser measuring means becomes the maximum and the predetermined processing reference position, such a processing method for brittle plate can be provided that, without a need to test the positioning by a manual work between the brittle plate and the processing wheel groove several times, the labor and time for the manual positioning of the processing wheel with respect to the brittle plate after the replacement of the processing wheel can be reduced, and efficiency of the processing of the brittle plate is high as a whole. 
     According to another processing method for brittle plate having the fourth feature, in the measuring process, the processing surface of the processing wheel is measured by the laser measuring means by emitting a laser to the predetermined region or the entire region on the processing surface in the axis direction of the processing wheel, and in the calculating process, on the basis of the position where the distance from the laser measuring means to the processing surface of the processing wheel in the first direction measured by the laser measuring means becomes the maximum and the predetermined processing reference position, the positional shift amount in the axis direction of the processing wheel is calculated, such a processing method for brittle plate can be provided that, without a need to test the positioning by a manual work between the brittle plate and the processing wheel groove several times, the labor and time for the manual positioning of the processing wheel with respect to the brittle plate after the replacement of the processing wheel can be reduced, and efficiency of the processing of the brittle plate is high as a whole. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a front view of a processing apparatus for brittle plate illustrated as an example. 
         FIG.  2    is a partially-omitted planar explanatory view of the processing apparatus for brittle plate shown in  FIG.  1   . 
         FIG.  3    is a partially-omitted left-side explanatory view of the processing apparatus for brittle plate shown in  FIG.  1   . 
         FIG.  4    are explanatory views of a processing head of the processing apparatus for brittle plate shown in  FIG.  1   . 
         FIG.  5    is a flowchart illustrating a processing method for brittle plate using the processing apparatus for brittle plate shown in  FIG.  1   . 
         FIG.  6    are explanatory views of an operation of a measuring portion of the processing apparatus for brittle plate shown in  FIG.  1   . 
         FIG.  7    are explanatory views of an operation of a shaft member of the processing apparatus for brittle plate shown in  FIG.  1   . 
         FIG.  8    are explanatory view of a measuring operation of the shaft member of the processing apparatus for brittle plate shown in  FIG.  1   . 
         FIG.  9    is a front view of a processing apparatus for brittle plate shown as another example. 
         FIG.  10    is a flowchart illustrating a processing method for brittle plate using the processing apparatus for brittle plate shown in  FIG.  9   . 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, embodiments for working the present invention will be described by referring to the drawings. In each figure, the same or corresponding signs are given to the same or corresponding constitutions, and explanation will be omitted. The present invention is not limited to these embodiments at all. 
     By referring to the drawings attached to  FIG.  1   , which is a front view of a processing apparatus  1  for brittle plate shown as an example and the like, details of the processing apparatus for brittle plate according to the present invention will be described as follows.  FIG.  2    is a partially-omitted planar explanatory view of the processing apparatus  1  for brittle plate,  FIG.  3    is a partially-omitted left-side explanatory view of the processing apparatus  1  for brittle plate,  FIG.  4    are explanatory views of a processing head  7  of the processing apparatus  1  for brittle plate, and  FIG.  5    is a flowchart illustrating a processing method for brittle plate using the processing apparatus  1  for brittle plate.  FIG.  6    are explanatory views of an operation of a measuring portion  8  of the processing apparatus  1  for brittle plate,  FIG.  7    are explanatory views of an operation of a shaft member  97  of the processing apparatus  1  for brittle plate,  FIG.  8    are explanatory views of a measuring operation of the shaft member  97  of the processing apparatus  1  for brittle plate, and in  FIG.  1   , illustration of an upstream side of the processing apparatus  1  for brittle plate or a carrying-in portion for brittle plate, a scribe, a folding/breaking portion and the like is omitted, for example, in  FIG.  2   , illustration of a lateral support frame  13  for a base  3 , the processing head  7  and the like is omitted, and in  FIG.  3   , illustration of a table  4 , the processing head  7  and the like is omitted. In  FIG.  1   , a conveying direction of the brittle plate  2  is shown as an X-axis direction, an up-and-down direction as a Z-axis direction, and a direction orthogonal to the X-axis direction and the Z-axis direction as a Y-axis direction. 
     In  FIGS.  1  to  3   , the processing apparatus  1  for brittle plate shown as an example includes a base  3 , 
     a table  4  provided on the base  3  and holding the rectangular flat-plate shaped brittle plate  2  having a predetermined area defined by an XY plane from a lower surface, the processing head  7  having a processing wheel  6  for processing an outer peripheral edge  5  of the brittle plate  2  held by the table  4 , the measuring portion  8  for measuring a positional shift amount Δ in an axis direction of the processing wheel  6  with respect to the brittle plate  2  and in the Z-axis direction orthogonal to the XY plane, and a control portion  9  which corrects a positional shift in the Z-axis direction of the processing wheel  6  on the basis of the positional shift amount Δ in the Z-axis direction of the processing wheel  6  measured by the measuring portion  8  and causes the processing wheel  6  whose positional shift was corrected to process the outer peripheral edge  5  of the brittle plate  2 . 
     In this embodiment, the brittle plate  2  only needs to be a plate having brittleness for an automobile, a liquid crystal panel of a liquid crystal TV and the like, a solar battery, furniture, and construction, for example, types of the brittle plate  2  are wide and diverse, and the brittle plate  2  may be a glass plate, a silicon-carbide plate, a silicone substrate and the like. 
     In this embodiment, the brittle plate  2  has a rectangular flat-plate shape, but instead of this, the brittle plate  2  may have any shape such as oval, circular, polygonal, square, rectangular and the like, and the brittle plate  2  only needs to have a predetermined area and a predetermined thickness. 
     The base  3  includes a main body  11  placed on a ground  10 , a pair of gate-shaped frames  12  stood on an upper surface of the main body  11  and on both end portions in the X-axis direction, which is a conveying direction of the brittle plate  2 , and a lateral support frame  13  extended between the pair of gate-shaped frames  12  and extending in the X-axis direction. 
     The table  4  is provided on the upper surface of the main body  11 , the measuring portion  8  is provided on a gate-shaped frame  12 A which is one of the pair of gate-shaped frames  12 , and the processing head  7  is provided on the lateral support frame  13 . 
     The table  4  includes a plurality of sucking discs  21  for adsorbing/holding from a lower surface of the brittle plate  2 , a sucking-disc base  22  on which the plurality of sucking discs  21  are placed, Y-axis moving means  23  for guiding/moving the sucking-disc base  22  in the Y-axis direction orthogonal to the X-axis direction, and a Cable Bear (Registered Trademark)  24  electrically connected to the Y-axis moving means  23 . 
     In this embodiment, the brittle plate  2  is supported by the plurality of sucking discs  21 , but instead of them, the brittle plate  2  may be supported by one sucking disc  21 . 
     The Y-axis moving means  23  includes two guide rails  25  extending in the Y-axis direction and laid in parallel with each other in the Y-axis direction, a slide block  26  attached to each of the guide rails  25  movably in the Y-axis direction and mounted on the lower surface of the sucking-disc base  22 , a feed screw  27  screwed with a nut (not shown) fixed to the lower surface of the sucking-disc base  22  and provided between the pair of guide rails  25 , and a Y-axis control motor (not shown) for rotating the feed screw  27 . 
     The sucking-disc base  22  moves in the Y-axis direction by rotation of the feed screw  27  by an operation of the Y-axis control motor. 
     The processing head  7  will be described in detail by referring to  FIGS.  4 ( a ) to  4 ( c ) , Note that  FIG.  4 ( a )  is a partially-omitted front view of the processing head  7 ,  FIG.  4 ( b )  is a partially-omitted side view of the processing head  7 , and  FIG.  4 ( c )  is a partially-omitted plan view of the processing head  7 . 
     The processing head  7  includes the pencil-edge type processing wheel  6  for processing the outer peripheral edge  5  of the brittle plate  2 , rotating means  31  in which the processing wheel  6  is attached to a lower end in the Z-axis direction and having an output rotating shaft for rotating the processing wheel  6  around an axis C1, a cut-in amount adjusting means  32  for adjusting a cut-in amount of the processing wheel  6  to the brittle plate  2 , X-axis moving means  33  for moving the processing wheel  6  in the X-axis direction, Z-axis moving means  34  for moving the processing wheel  6  in the Z-axis direction, turning means  36  having a turning shaft  35  for turning the processing wheel  6  around an axis C2, and a base  39  mounted on a turning shaft holder  38  on a lower end portion  37  of the turning shaft  35  in the turning means  36 . 
     The processing wheel  6  includes a disc-shaped main body  41  and a processing surface  42  containing diamond abrasive grains and the like. Moreover, the processing wheel  6  grinds, polishes or grinds and polishes (hereinafter, referred to as processing) the brittle plate  2  with the processing surface  42 . 
     The processing head  7  and the brittle plate  2  are numerically controlled by the control portion  9  and move on an XY-plane coordinate system, and the processing wheel  6  rotates around the outer periphery of the brittle plate  2  with an angle controlled so as to be directed to a normal direction all the time with respect to the outer peripheral edge  5  of the brittle plate  2 , and processes the outer peripheral edge  5  of the brittle plate  2 . 
     The rotating means  31  is a spindle motor having an output rotating shaft  46  in which the processing wheel  6  is mounted on a lower end  45  in the Z-axis direction and rotates the processing wheel  6  in an R1 direction around the rotation axis C1 with the rotation axis C1 of the output rotating shaft  46  as a center by driving of the spindle motor. 
     The cut-in amount adjusting means  32  includes two cut-in slides  51  mounted on the base  39 , extending in the X-axis direction, and laid in parallel with each other, an X-axis direction slide base  52  attached to each of the cut-in slides  51  and capable of relative movement in the X-axis direction, a feed screw  54  screwed with a nut  53  fixed to the X-axis direction slide base  52 , a cut-in gear  55  mounted on the feed screw  54 , and a cut-in servomotor  58  for adjusting the cut-in amount, having a cut-in gear  56  meshed with the cut-in gear  55  and mounted on the base  39  through a bracket  57 . 
     The control portion  9  operates the cut-in servomotor  58 , rotates the feed screw  54  through the cut-in gear  55  and the cut-in gear  56 , moves the X-axis direction slide base  52  in the X-axis direction, and adjusts the cut-in amount of the processing wheel  6  with respect to the brittle plate  2 . 
     The processing wheel  6  is constituted such that a peripheral end surface (processing surface  42 ) thereof matches the rotation axis C2 of the turning shaft  35  by adjustment by the cut-in amount adjusting means  32 . 
     The X-axis moving means  33  includes an X-axis moving base  61  on which the processing head  7  is mounted, a pair of guide rails  63  mounted on a side surface  62  of the lateral support frame  13  and extending in parallel in the X-axis direction, a slider (not shown) slidably fitted with the pair of guide rails  63  and fixed to a rear surface of the x-axis moving base  61 , a nut (not shown) mounted on the X-axis moving base  61 , a feed screw  64  provided between the pair of guide rails  63  and with which the nut is screwed, and an X-axis servomotor  67  having an output rotating shaft  66  with which the feed screw  64  is linked through a bearing  65 . 
     The processing head  7  is constituted so as to linearly move integrally with the X-axis moving base  61  in the X-axis direction by the X-axis moving means  33 , and the linear motion of the X-axis moving base  61  in the X-axis direction rotates the feed screw  64  through the bearing  65  by driving of the X-axis servomotor  67 , and the X-axis moving base  61  is moved in the X-axis direction. 
     The Z-axis moving means  34  includes two guide rails  71  mounted on the X-axis direction slide base  52 , extending in the Z-axis direction, and laid in parallel with each other, a Z-axis direction slide base  72  movably attached to each of the guide rails  71  and mounted capable of relative movement in the Z-axis direction with respect to the X-axis direction slide base  52 , a feed screw  74  screwed with a nut  73  fixed to the X-axis direction slide base  52 , a gear box  75  linked with the feed screw  74 , and a Z-axis servomotor  77  having an output rotating shaft  76  linked with the gear box  75  and adjusting a position in the Z-axis direction of the processing wheel  6 . 
     The control portion  9  operates the Z-axis servomotor  77 , rotates the feed screw  74 , moves the Z-axis direction slide base  72  in the Z-axis direction, and moves the processing wheel  6  in the Z-axis direction. 
     The processing wheel  6  has a positional shift in the axis direction corrected by adjustment of the Z-axis moving means  34 . 
     The turning means  36  includes a turning servomotor  81  for rotating the processing head  7  around the axis C2, a gear box  82  linked with an output rotating shaft of the turning servomotor  81 , the turning shaft  35  having a rotating gear  84  meshed with a rotating gear  83  of the gear box  82 , and a bearing case  85  rotatably holding the turning shaft  35 . 
     The turning means  36  is mounted on the X-axis moving base  61  moving in the X-axis, and the turning shaft  35  has the axis C2 thereof incorporated orthogonally to the XY-plane coordinate system, that is, an upper surface of the brittle plate  2 . 
     The processing head  7  is mounted on the turning shaft  35  of the turning means  36  through the base  39  and horizontally and rotationally moved with the axis C2 of the turning shaft  35  as the center, integrally with the turning shaft  35 , while an angle is controlled in an R2 direction around the axis C2. 
     The measuring portion  8  includes a mounting plate  91  mounted on a side surface of one frame  12 A in the pair of frames  12 , a Z-axis moving base  92  mounted movably in the Z-axis direction on the mounting plate  91 , Z-axis moving means  93  for moving the Z-axis moving base  92  in the Z-direction, an X-axis moving base  94  mounted movably in the X-axis direction with respect to the mounting plate  91 , X-axis moving means  95  for moving the X-axis moving base  94  in the X-axis direction as a first direction orthogonal to thee axis C1 of the processing wheel  6 , rotating means  98  provided on the X-axis moving base  94  and having a shaft member  97  having a distal end portion  96 , and a position measurement sensor  99  for measuring a position of the processing surface  44  of the processing wheel  6 . 
     The Z-axis moving base  92  includes a base  101 , a plate  104  mounted on the base  101  and having a flange portion  103  extending in the Y-axis direction from one end  102  in the Z-axis direction, and a plate portion  107  having a groove  106  with which a distal end portion  105  in the Y-axis direction of the flange portion  103  is fitted. 
     In the plate  104  in this embodiment, the flange portion  103  is formed integrally on the one end  102  in the Z-axis direction. 
     The Z-axis moving means  93  includes one guide rail (not shown) extending in the Z-axis direction and laid in parallel with each other, a slide block (not shown) attached to each of the guide rail (not shown) movably in the Z-axis direction and mounted on the Z-axis moving base  92 , a feed screw (not shown) screwed with a nut (not shown) fixed to the lower surface of the Z-axis moving base  92 , and a Z-axis control motor  108  for rotating the feed screw. 
     The X-axis moving base  94  is formed of a plate portion  111  having a predetermined area extending in the X-axis direction, and a Cable-Bear mounting plate  113  for mounting a Cable Bear  112  is mounted on the plate portion  111 . 
     The X-axis moving means  95  includes a rodless air cylinder  123  mounted on one surface  109  in the Y-axis direction of the plate portion  107  and having a slider  121  movable in the X-axis direction, a rodless air-cylinder connecting plate  124  connected to the slider  121  and also connected to the plate portion  111 , a guide rail  125  laid on the other surface  110  in the Y-axis direction of the plate portion  107  and extending in the X-axis direction, and a guide block  126  attached movably in the X-axis direction to the guide rail  125  and mounted on the one surface  115  in the Y-axis direction of the plate portion  111 . 
     The X-axis moving means  95  moves the plate portion  111  in the X-axis direction through the rodless air-cylinder connecting plate  124  connected to the slider  121  by driving of the rodless air cylinder  123 . 
     The rotating means  98  includes a servomotor  133  for controlling a torque, mounted on the other surface  116  in the Y-axis direction of the plate portion  111  through a bracket  131  and having an output rotating shaft  132 , a shaft member  97  having a distal end portion  96 , a coupling  134  for connecting the output rotating shaft  132  and the shaft member  97  to each other, and a bearing case  135  mounted on the other surface  116  in the Y-axis direction of the plate portion  111  and rotatably supporting the shaft member  97 . 
     In this embodiment, the axis of the shaft member  97  and the axis of the output rotating shaft  132  of the servomotor  133  are disposed on an axis C3 (coaxially). 
     The rotating means  98  rotates the shaft member  97  through the coupling  134  in an R3 direction around the axis C3 by driving of the servomotor  133 . 
     The shaft member  97  includes a shaft body  141  extending in the X-axis direction, a notched portion  143  provided on one end portion  142  of the shaft body  141  in the X-axis direction, the distal end portion  96  inserted and held by the notched portion  143 , and fixing means  144  for fixing the distal end portion  96  to the shaft body  141 . 
     The distal end portion  96  is formed of a hard material and includes a rectangular distal-end portion body  152  having a through hole  151  and a distal-end portion notched part  154  formed in an end portion  153  of the distal-end portion body  152  in the axis C3 direction. 
     The distal end portion  96  only needs to be formed of a hard material, and the distal end portion  96  is formed of a stainless hard material in this embodiment. 
     The fixing means  144  is formed of a screw body  161  in which a male thread part (not shown) is formed on an outer peripheral surface and a head portion  162  provided on one end of the screw body  161 , and in the through hole  151  of the shaft member  97 , a female thread part (not shown) formed on an inner peripheral surface defining the through hole  151  is formed, and the fixing means  144  fixes the distal end portion  96  to the shaft member  97  by penetrating the screw body  161  through the through hole  151  and by screwing the male thread part with the female thread part of the through hole. 
     The position measurement sensor  99  includes a contact sensor  172  mounted on the other surface  116  in the Y-axis direction of the plate portion  111  through a bracket  171  and a stopper  174  mounted on the other surface  116  in the Y-axis direction of the plate portion  111  through the bracket  171  and brought into contact with one side surface  173  in the Y-axis direction of the flange portion  103 . 
     Regarding the x-axis moving base  94 , in the X1 direction which is one direction in the X-axis direction by the rodless air cylinder  123 , first, the contact sensor  172  is brought into contact with the side surface  173  of the flange portion  103 , and then, the X-axis moving base  94  further moves in the X1 direction, whereby the stopper  174  is brought into contact with the side surface  173  of the flange portion  103 , and the movement in the X1 direction is stopped. 
     The X-axis moving base  94  is biased in the X1 direction by an elastic force by an air pressure by the rodless air cylinder  123  in a state where the contact sensor  172  and the stopper  174  are in contact with the side surface  173  of the flange portion  103 . 
     The contact sensor  172  is connected to the control portion  9 , and the control portion  9  moves the X-axis moving base  94  in an X2 direction by movement of the processing head  7  in the X2 direction. The control portion  9  stops the movement of the processing head  7  in the X1 direction when a movement amount set in advance in the contact sensor  172  is reached in the movement of this X-axis moving base  94  in the X2 direction. 
     The contact sensor  172  is a contact-type sensor in this embodiment, but in place of this, a digital dial gauge, a laser displacement sensor, a non-contact sensor or the like which detects displacement electrically or optically may be used, for example. 
     The stopper  174  can adjust a distance until the stopper  174  is brought into contact with the side surface  173  of the flange portion  103  by adjusting a protruding amount in the X1 direction from the bracket  171 . 
     The control portion  9  includes arithmetic processing (processing) means  181  such as a CPU (Central Processing Unit) or the like and a memory (memory) means  182  such as a flash memory or the like. For example, the control portion  9  may be a computer (computer) such as a microprocessor, or the control portion  9  may be a virtual server constructed in a cloud or a physical computer installed in a machine room or the like. Moreover, the control portion  9  may be configured by a single computer, may be configured by a plurality of computers linked with each other, or may be configured by a cloud which is a collection of computer resources. 
     The control portion  9  is connected to the table  4 , the processing head  7 , motors required for driving the measuring portion  8  and the processing apparatus  1  for brittle plate, the rodless air cylinder, the Cable Bear and the like and controls them through numerical control instructions programmed in advance. Since the control portion  9  as above is well-known, detailed description thereof is omitted. 
     The memory means  182  is a recording medium including a ROM (Read Only Memory), a RAM (Random Access Memory), a hard disk drive and the like. The memory means  182  stores a program executed by the control portion  9  in advance. The memory means  182  may be provided outside the processing apparatus  1  for brittle plate and in that case, transmission/reception of data with the control portion  9  may be performed via a network. 
     In this embodiment, each of the table  4 , the processing head  7 , and the measuring portion  8  is numerically controlled individually or each of the table  4 , the processing head  7 , and the measuring portion  8  may be numerically controlled in synchronization. 
     Subsequently, by referring to  FIGS.  5  to  8   , a processing method for brittle plate for processing the brittle plate  2  by using the processing apparatus  1  for brittle plate will be described. The following operation of the processing apparatus  1  for brittle plate is controlled by the control portion  9 . Moreover,  FIG.  5    is a flowchart illustrating the processing method for brittle plate for processing the brittle plate  2  by using the processing apparatus  1  for brittle plate in this embodiment. 
     As shown in  FIG.  5   , the processing method for brittle plate includes a positioning process S 101  of positioning the shaft member  97  to a predetermined position, a first measuring process S 102  of rotating the shaft member  97  in an R4 direction which is a first rotating direction in the R3 direction around the axis C3 so as to bring the distal end portion  96  into contact with the processing surface  42  of the processing wheel  6  and of measuring a first position A on the processing surface  42  of the processing wheel  6  with which the distal end portion  96  is in contact, a second measuring process S 103  of rotating the shaft member  97  in an R5 direction which is a second rotating direction opposite to the R4 direction which is the first rotating direction in the R3 direction around the axis C3 so as to bring the distal end portion  96  into contact with the processing surface  42  of the processing wheel  6  and of measuring a second position B on the processing surface  42  of the processing wheel  6  with which the distal end portion  96  is in contact, a calculating process S 104  of calculating a first distance D3 from a predetermined processing reference position B1 to the first position A in the Z-axis direction of the processing wheel  6 , of calculating a second distance D4 from the predetermined processing reference position B1 to the second position B in the Z-axis direction of the processing wheel  6 , and of calculating a positional shift amount Δ in the Z-axis direction of the processing wheel  6  with respect to the brittle plate  2  on the basis of the first distance D3 and the second distance D4, a correcting process S 105  of correcting a positional shift in the Z-axis direction of the processing wheel  6  on the basis of the positional shift amount Δ in the Z-axis direction of the processing wheel  6 , and a processing process S 106  of causing the processing wheel  6  after the correcting process to process the outer peripheral edge  5  of the brittle plate  2 . 
     First, as the positioning process S 101 , the brittle plate  2  to be processed is placed above the table  4  and positioned by vacuum sucking/supporting the brittle plate  2  by the sucking discs  21  of the table  4 . 
     The Z-axis moving table  92  is moved in the Z-axis direction by the Z-axis moving means  93  so that the axis C3 of the shaft member  97  is positioned to the predetermined processing reference position B1. In this embodiment, the predetermined processing reference position B1 is a position where the brittle plate  2  is divided into halves in the Z-axis direction (thickness direction of the brittle plate  2 ). 
     As shown in  FIGS.  6 ( a ) and  6 ( b ) , the X-axis moving means  95  is driven, whereby the X-axis moving base  94  is moved in the X1 direction, the shaft member  97  after the positioning to the processing reference position B1 is moved in the X1 direction, the contact sensor  172  is brought into contact with the side surface  173  of the flange portion  103 , the x-axis moving base  94  is further moved in the X1 direction, the stopper  174  is brought into contact with the side surface  173  of the flange portion  103 , and the movement of the x-axis moving base  94  in the X1 direction is stopped (limited). 
     As shown in  FIGS.  6 ( b ) and  6 ( c ) , in a state where the contact sensor  172  is in contact with the side surface  173  of the flange portion  103 , the stopper  174  is in contact with the side surface  173  of the flange portion  103 , and the movement of the X-axis moving base  94  in the X1 direction is stopped (limited), the processing wheel  6  is moved in the X2 direction by the X-axis moving means  33 , and the processing surface  42  of the processing wheel  6  is gradually brought closer to the shaft member  97 . 
     The control portion  9  gradually moves the processing wheel  6  in the X2 direction, brings the processing surface  42  of the processing wheel  6  closer to the end portion  153  of the distal-end portion body  152 , and the processing wheel  6  is further moved in the X2 direction by a countervailing force in the X2 direction opposite to a direction of the air pressure in the X1 direction of the rodless air cylinder  123 . 
     The processing wheel  6  is moved in the X2 direction in a state where the end portion  153  of the distal-end portion body  152  is in contact with the processing surface  42 . 
     The control portion  9  stops the movement of the processing wheel  6  in the X2 direction when the horizontal distance D1 by which the contact sensor  172  is moved by the processing wheel  6  from the side surface  173  of the flange portion  103  in the X2 direction reaches the movement amount set in advance in the contact sensor  172 . 
     At this time, the processing surface  42  of the processing wheel  6  and the end portion  153  of the distal-end portion body  152  maintain a contact state. The horizontal distance D1 by which the contact sensor  172  is moved in the X2 direction is equal to the horizontal distance D2 by which the processing wheel  6  is moved in the X2 direction. 
     After the movement of the processing wheel  6  in the X2 direction is stopped, the state where the processing surface  42  of the processing wheel  6  and the end portion  153  of the distal-end portion body  152  are in contact is maintained, the processing wheel  6  is moved in the X1 direction on the basis of the movement amount set in advance in the contact sensor  172 . 
     As described above, the control portion  9  measures the position where the processing surface  42  is in contact with the end portion  153  of the distal-end portion body  152  and acquires position information. 
     In order to cause the processing surface  42  of the processing wheel  6  faced to the end portion  153  of the distal-end portion body  152  with a predetermined clearance S1, the processing wheel  6  is further moved in the xl direction. 
     As shown in  FIGS.  7   , the predetermined clearance  51  may be such a degree that the end portion  153  of the distal-end portion body  152  is not in contact with the processing surface  42  of the processing wheel  6 , or the clearance S1 is preferably approximately 0.1 to 0.5 mm or more preferably it is 0.3 mm. The clearance S1 can be changed depending on a shape of the processing surface  42 . 
     The end portion  153  of the distal-end portion body  152  is located in an annular space  52  defined by an outer profile and the processing surface  42  of the processing wheel  6  in a radial direction. 
     Subsequently, a measuring operation of the shaft member  97  will be described in detail by referring to  FIG.  8   ( a   1 ) to  8 ( a   3 ) and  FIGS.  8   ( b   1 ) to  8 ( b   3 ). Note that  FIGS.  8   ( a   1 ) to  8 ( a   3 ) are partially-omitted sectional views of the shaft member  97 , and  FIGS.  8   ( b   1 ) to  8 ( b   3 ) are partially-omitted side views of the distal end portion  96 . 
     As the first measuring process S 102 , as shown in  FIGS.  8   ( a   1 ) to  8 ( a   2 ) and  FIGS.  8   ( b   1 ) to  8 ( b   2 ), the measuring portion  8  causes the shaft member  97  to be rotated in the R4 direction so that the end portion  153  of the distal-end portion body  152  is brought into contact with the processing surface  42  of the processing wheel  6  and measures a positional coordinate of the first position A where the end portion  153  of the distal-end portion body  152  is rotated in the R4 direction and is brought into contact with the processing surface  42  of the processing wheel  6 . 
     Subsequently, as shown in  FIG.  8   ( a   3 ) and  FIG.  8   ( b   3 ), as the second measuring process  103 , the measuring portion  8  causes the shaft member  97  to be rotated in the R5 direction so that the end portion  153  of the distal-end portion body  152  is brought into contact with the processing surface  42  of the processing wheel  6  and measures a positional coordinate of the second position B where the end portion  153  of the distal-end portion body  152  is rotated in the R5 direction and is brought into contact with the processing surface  42  of the processing wheel  6   
     Subsequently, as the calculating process S 104 , the control portion  9  calculates the first distance D3 in the Z-axis direction of the processing wheel  6  from the predetermined processing reference position B1 to the first position A, and calculates the second distance D4 in the Z-axis direction of the processing wheel  6  from the predetermined processing reference position B1 to the second position B. For example, the first distance D3 is calculated from an angle θ1 formed by the distal-end portion body  152  and the processing reference position B1 and a length hl in the Y-axis direction of the distal-end portion body  152 , and the second distance D4 is calculated from an angle  62  formed by the distal-end portion body  152  and the processing reference position B1 and the length hl in the Y-axis direction of the distal-end portion body  152 . Moreover, the angle θ1 and the angle θ2 may be calculated from the servomotor  133 . 
     On the basis of the first distance D3 and the second distance D4, the positional shift amount Δ in the Z-axis direction of the processing wheel  6  with respect to the brittle plate  2  is calculated. 
     The calculation of the positional shift amount Δ is executed by the arithmetic processing means  181 . In the calculation by the arithmetic processing means  181 , the positional shift amount Δ is acquired by the positional shift amount Δ (correction amount)=((D3+D4)/2-D3), in the case of D3&lt;D4, for example. 
     Subsequently, as the correcting process S 105 , the control portion  9  causes the Z-axis moving means  34  to be driven on the basis of the positional shift amount Δ by the arithmetic processing means  181 , moves the processing wheel  6  in a Z2 direction (upward) which is the other in the Z-axis direction, and corrects the positional shift (positional shift from the predetermined processing reference position B1 of the brittle plate  2  to the position B2 dividing the processing surface  42  of the processing wheel  6  into halves in the Z-axis direction) in the Z-axis direction of the processing wheel  6 . 
     Subsequently, as the processing process S 106 , the processing wheel  6  whose positional shift was corrected is caused to process the outer peripheral edge  5  of the brittle plate  2 . 
     According to the processing method for brittle plate in this embodiment, since the shaft member  97  having the distal end portion  96  of the rotating means  31  is inserted into the annular space S2 of the processing surface  42  of the processing wheel  6 , the shaft member  97  is rotated in the R4 direction and in the R5 direction, and the positional coordinates (the first position A and the second position B) where the distal end portion  96  is in contact with the processing surface  42  of the processing wheel  6  are measured, respectively, the positional shift amount Δ in the Z-axis direction of the processing wheel  6  is automatically calculated by the control portion  9  by the positional coordinates from the processing reference position B1, and the positional shift in the Z-axis direction of the processing wheel  6  can be automatically corrected, the manual positioning of the processing wheel  6  performed at each replacement of the processing wheel  6 , for example, can be automated, labor and time for the manual positioning of the processing wheel  6  with respect to the brittle plate  2  after the replacement of the processing wheel  6  can be reduced, and efficiency of the processing of the brittle plate as a whole can be made high. 
     According to another example of this embodiment, in the processing method for brittle plate, by repeating the first measuring process S 102 , the second measuring process S 103 , the calculating process S 104 , and the correcting process S 105  in order several times, the positional shift amount Δ in the Z-axis direction of the processing wheel  6  with respect to the brittle plate  2  can be brought closer to 0 as much as possible, the positional shift in the Z-axis direction of the processing wheel  6  is eliminated, the processing surface  42  of the processing wheel  6  corrected several times is brought into contact with the brittle plate  2  with accuracy, and the brittle plate  2  can be processed with high accuracy. In another example of this embodiment, in the processing method for brittle plate, each process from the first measuring process S 102  to the correcting process S 105  may be preferably repeated in order from twice to five times, or more preferably, the processes from the first measuring process S 102  to the correcting process S 105  may be repeated in order three times so that the positional shift amount Δ in the Z-axis direction of the processing wheel  6  with respect to the brittle plate  2  can be brought closer to 0 as much as possible. Moreover, in order to reduce the positional shift in the Z-axis direction of the processing wheel  6  with respect to the brittle plate  2 , the first measuring process S 102 , the second measuring process S 103 , the calculating process S 104 , and the correcting process S 105  may be further repeated in order. 
     According to another example of this embodiment, in the processing method for brittle plate, in the processing wheel  6  whose positional shift in the Z-axis direction was corrected after the correcting process S 105  or in the processing wheel  6  whose positional shift was corrected several times by repeating each process from the first measuring process S 102  to the correcting process S 105  in order several times, in a state where the control portion  9  causes the X-axis moving means  95  to be driven, causes the X-axis moving base  94  to move in the X1 direction, causes the shaft member  97  after the positioning to the processing reference position B1 to move in the X1 direction, causes the contact sensor  172  and the stopper  174  to be brought into contact with the side surface  173  of the flange portion  103 , stops (limits) the movement of the X-axis moving table  94  in the X1 direction so that the movement of the X-axis moving base  94  in the X1 direction is stopped (limited), the processing wheel  6  is moved by the X-axis moving means  33  in the X2 direction, the processing surface  42  of the processing wheel  6  is gradually brought closer (moved) to the shaft member  97 , the processing surface  42  of the processing wheel  6  is brought into contact with the end portion  153  of the distal-end portion body  152 , the processing wheel  6  is further moved in the X2 direction by the countervailing force in the X2 direction which is the direction opposite to the air pressure of the rodless air cylinder  123  in the X1 direction, and when the horizontal distance D1 by which the sensor  172  is moved in the X2 direction from the side surface  175  of the flange portion  103  of the sensor  172  reaches the movement amount set in advance in the contact sensor  172 , the movement of the processing wheel  6  in the X2 direction is stopped, and after the movement of the processing wheel  6  in the X2 direction is stopped, while the state where the processing surface  42  of the processing wheel  6  and the end portion  153  of the distal-end portion body  152  are in contact is maintained, on the basis of the movement amount set in advance in the contact sensor  172 , by moving the processing wheel  6  in the X1 direction, the control portion  9  can measure the position where the processing surface  42  of the processing wheel  6  whose positional shift in the Z-axis direction was corrected is brought into contact with the end portion  153  of the distal-end portion body  152 , acquire the position information, and cause the processing surface  42  of the processing wheel  6  to be brought into contact with the outer peripheral edge  5  of the brittle plate  2  with accuracy on the basis of this position information and valued set in the control portion  9  in advance, that is, information set in advance such as dimensions of the processing wheel  6 , the shaft member  97 , the distal end portion  96  and the like, for example, and thus, accurate cut-in can be performed in the brittle plate  2  by the processing wheel  6  whose positional shift in the Z-axis direction was corrected after the correcting process S 105  or the processing wheel  6  whose positional shift was corrected several times by repeating each process from the first measuring process S 102  to the correcting process S 105  in order several times. 
     By referring to the drawings attached to  FIG.  9    which is a front view of a processing apparatus  200  for brittle plate and the like illustrated as another example, details of the processing apparatus  200  for brittle plate according to the present invention will be described as follows.  FIG.  10    is a flowchart illustrating a processing method for brittle plate of the processing apparatus  200  for brittle plate. Moreover, the processing apparatus  200  for brittle plate shown in  FIG.  9    is different from that in  FIG.  1    in a point that, instead of the rotating means  98  and the position measurement sensor  99 , laser measuring means  201  is used. The other constitutions of this processing apparatus  200  for brittle plate are the same as those of the processing apparatus  1  for brittle plate in  FIG.  1    and thus, by giving the same signs as those in  FIG.  1    and by incorporating the explanation in  FIG.  1   , the detailed description of the other constitutions of this processing apparatus  1  for brittle plate will be omitted. 
     The laser measuring means  201  is provided on the X-axis moving base  94  and measures the processing surface  42  by emitting a laser to the processing surface  42  of the processing wheel  6 . 
     A measurement range of the laser measuring means  201  is different depending on a type of the laser measuring means  201 , but in the case of a middle-range type of CL-3000 series by KEYENCE (CL-L070/CL-P070), its measurement range is 70 mm±10 mm, in the case of the middle-range type of the LJ-G5000 series (LJ-G080), its measurement range is 80 mm±23 mm, and in the case of the highly accurate one (LJ-G030) of the LJ-G5000 series, its measurement range is 80 mm±23 mm. Moreover, the types of the laser measuring means  201  are not particularly limited to them, but they can be selected and used as appropriate in accordance with the applications. 
     Moreover, the laser measuring means  201  can conduct various measurements such as a height (peak height, bottom height, average height), a width, a position, a step, an angle, an intersection, a shape, a sectional area, shape comparison and the like, for example, can conduct momentary measurement of a predetermined region or an entire region and can measure a position where a distance in the X-axis direction from the laser measuring means  201  to the processing surface  42  of the processing wheel  6  becomes the maximum in this embodiment. 
     The control portion  9  calculates a position where the distance in the X-axis direction from the laser measuring means  201  to the processing surface  42  of the processing wheel  6  becomes the maximum by a measured value measured by the laser measuring means  201 , calculates the positional shift amount Δ in the Z-axis direction of the processing wheel  6  on the basis of the position (center B2 in the Z-axis direction of the processing wheel  6 ) where the distance from the laser measuring means  201  to the processing surface  42  of the processing wheel  6  becomes the maximum, and the processing reference position B1, corrects the positional shift in the Z-axis direction of the processing wheel  6  on the basis of the positional shift amount Δ in the Z-axis direction of the processing wheel  6 , and causes the processing wheel  6  whose positional shift was corrected to process the outer peripheral edge  5  of the brittle plate  2 . 
     Subsequently, by referring to  FIG.  10   , a processing method for brittle plate for processing the brittle plate  2  by the processing apparatus  200  for brittle plate in this embodiment will be described. The following operations of the processing apparatus  200  for brittle plate are controlled by the control portion  9 . Moreover,  FIG.  10    is a flowchart illustrating the processing method for brittle plate for processing the brittle plate  2  by using the processing apparatus  200  for brittle plate in this embodiment. 
     As shown in  FIG.  10   , the processing method for brittle plate includes a positioning process  8201  of positioning the laser measuring means  201  to a predetermined position, a measuring process  8202  of measuring the processing surface  42  of the processing wheel  6  by emitting a laser beam of the laser measuring means  201  to the processing surface  42  of the processing wheel  6 , a calculating process s 203  of calculating the positional shift amount Δ in the Z-axis direction of the processing wheel  6  on the basis of a measured value measured by the laser measuring means  201 , a correcting process S 204  of correcting the positional shift in the Z-axis direction of the processing wheel  6  on the basis of the positional shift amount Δ in the Z-axis direction of the processing wheel  6 , and a processing process s 205  of causing the processing wheel  6  after the correcting process to process the outer peripheral edge  5  of the brittle plate  2 . 
     First, as the positioning process S 201 , the brittle plate  2  to be processed is placed above the table  4  and positioned by vacuum sucking/supporting the brittle plate  2  by the sucking discs  21  of the table  4 . 
     In order to dispose the processing surface  42  of the processing wheel  6  in a range where measurement can be made by the laser measuring means  201 , the Z-axis moving means  93  is driven, the position in the Z-axis direction of the Z-axis moving base  92  is adjusted, the X-axis moving means  95  is driven, the X-axis moving base  94  is moved in the X1 direction, and the laser measuring means  201  is brought closer to the processing wheel  6  in the measurement range of the laser measuring means  201 . 
     Subsequently, as the measuring process S 202 , the laser measuring means  201  measures the processing surface  42  of the processing wheel  6  by emitting a laser beam to the processing surface  42  of the processing wheel  6 . 
     Subsequently, as the calculating process s 203 , the control portion  9  calculates the positional shift amount Δ in the Z-axis direction of the processing wheel  6  on the basis of the measured value measured by the laser measuring means  201 . 
     The calculation of the positional shift amount Δ is performed by the arithmetic processing means  181 . 
     Subsequently, as the correcting process s 204 , the control portion  9  causes the Z-axis moving means  34  to be driven on the basis of the positional shift amount Δ by the arithmetic processing means  181  so as to correct the positional shift in the Z-axis direction of the processing wheel  6 . 
     Subsequently, as the processing process s 205 , the processing wheel  6  whose Z-positional shift was corrected is caused to process the outer peripheral edge  5  of the brittle plate  2 . 
     According to the processing method for brittle plate of an example of this another embodiment, since the positional shift in the Z-axis direction of the processing wheel  6  can be automatically corrected by automatically calculating the positional shift amount Δ in the Z-axis direction of the processing wheel  6  by the laser measuring means  201  easily, for example, the manual positioning of the processing wheel  6  performed at each replacement of the processing wheel  6  can be automated, labor and time for the manual positioning of the processing wheel  6  with respect to the brittle plate  2  after the replacement of the processing wheel  6  can be reduced, and efficiency of the processing of the brittle plate as a whole can be made high. 
     According to an example of this another embodiment, in the measuring process s 202 , in the state where the laser measuring means  201  emits the laser to the processing surface  42  of the processing wheel  6 , time for measurement of the processing surface  42  of the processing wheel  6  can be reduced by relative movement of at least either one of the processing wheel  6  and the laser measuring means  201  from one to the other in the Z-axis direction and thus, for example, the manual positioning of the processing wheel  6  with respect to the brittle plate  2  performed at each replacement of the processing wheel  6  can be automated, and time for the positioning of the processing wheel  6  with respect to the brittle plate  2  can be drastically reduced. 
     According to another example of this another embodiment, in the measuring process s 202 , since the laser measuring means  201  can measure the processing surface  42  of the processing wheel  6  by emitting the laser to at least one predetermined region, a plurality of predetermined regions or the entire region on the processing surface  42  of the processing wheel  6  in the Z-axis direction, time for measurement of the processing surface  42  of the processing wheel  6  can be reduced, for example, the manual positioning of the processing wheel  6  performed at each replacement of the processing wheel  6  can be automated, and time for the positioning of the processing wheel  6  can be drastically reduced. The predetermined region only needs to have an irradiation width of the laser to the processing surface  42  of the processing wheel  6  in the Z-axis direction, and it may be a region having one width or a region having a plurality of widths. 
     According to another example of this another embodiment, in the measuring process s 202 , the processing surface  42  of the processing wheel  6  can be measured at the same time by emitting the laser at the same time to a predetermined region on the processing surface  42  of the processing wheel  6  in the Z-axis direction or arbitrary  8  spots on the processing surface  42  of the processing wheel  6  in the Z-axis direction, for example, and moreover, in the measuring process s 202 , the processing surface  42  of the processing wheel  6  can be measured at the same time by emitting the laser at the same time to the entire region on the processing surface  42  of the processing wheel  6  in the Z-axis direction. 
     In the examples of the processing apparatus  1  for brittle plate and the processing apparatus  200  for brittle plate, the measuring portion  8  is constituted to include the Z-axis moving base  92  mounted movably in the Z-axis direction on the mounting plate  91  and the Z-axis moving means  93  for moving the Z-axis moving base  92  in the Z-direction, but instead of this, the measuring portion  8  may be mounted immovably in the Z-axis direction in a state positioned to the frame  12 A in the Z-axis direction without including the Z-axis moving base  92  and the Z-axis moving means  93 . 
     REFERENCE SIGNS LIST 
     
         
           1  Processing apparatus for brittle plate 
           2  Brittle plate 
           3  Base 
           4  Table 
           5  Outer peripheral edge 
           6  Processing wheel 
           7  Processing head 
           8  Measuring portion 
           9  Control portion 
           10  Ground 
           11  Main body 
           12  Frame 
           12 A Frame 
           13  Lateral support frame 
           21  Sucking disc 
           22  Sucking-disc base 
           23  Y-axis moving means 
           24  Cable Bear 
           25  Guide rail 
           26  Slide block 
           27  Feed screw 
           31  Rotating means 
           32  Cut-in amount adjusting means 
           33  X-axis moving means 
           34  Z-axis moving means 
           35  Turning shaft 
           36  Turning means 
           37  Lower end portion 
           38  Turning holder 
           39  Base 
           41  Main body 
           42  Processing surface 
           45  lower end 
           46  Output rotating shaft 
           51  Cut-in slide 
           52  X-axis direction slide base 
           53  Nut 
           54  Feed screw 
           55  Cut-in gear 
           56  Cut-in gear 
           57  Bracket 
           58  Cut-in servomotor 
           61  X-axis moving base 
           62  Side surface 
           63  Guide rail 
           64  Feed screw 
           65  Bearing 
           66  Output rotating shaft 
           67  X-axis servomotor 
           71  Guide rail 
           72  Z-axis direction slide base 
           73  Nut 
           74  Feed screw 
           75  Gear box 
           76  Output rotating shaft 
           77  Z-axis servomotor 
           81  Turning servomotor 
           82  Gear box 
           83  Rotating gear 
           84  Rotating gear 
           85  Bearing case 
           91  Mounting base 
           92  Z-axis moving base 
           93  Z-axis moving means 
           94  X-axis moving base 
           95  X-axis moving means 
           96  Distal end portion 
           97  Shaft member 
           98  Rotating means 
           99  Position measurement sensor 
           101  Base 
           102  One end 
           103  Flange portion 
           104  Plate 
           105  Distal end portion 
           106  Groove 
           107  Plate portion 
           108  Z-axis control motor 
           109  Surface 
           110  Surface 
           111  Plate portion 
           112  Cable Bear 
           113  Cable-Bear mounting plate 
           115  Surface 
           116  Surface 
           121  Slider 
           123  Rodless air cylinder 
           124  Rodless air-cylinder connecting plate 
           125  Guide rail 
           126  Guide block 
           131  Bracket 
           132  output rotating shaft 
           133  Servomotor 
           134  Coupling 
           135  Bearing case 
           141  Shaft body 
           142  End portion 
           143  notched portion 
           144  Fixing means 
           151  Through hole 
           152  Distal-end portion body 
           153  End portion 
           154  Distal-end portion notched part 
           161  Screw body 
           162  Head portion 
           171  Bracket 
           172  Contact sensor 
           173  Side surface 
           174  Stopper 
           181  Arithmetic processing means 
           182  Memory means 
           200  Processing apparatus for brittle plate 
           201  Laser measuring means