Bend-breaking system and bend-breaking processing method

A bend-breaking processing method for bend-breaking an edge portion of a glass plate to be processed,

• wherein the bend-breaking processing method uses a bend-breaking device that is positioned on a side of an upper surface of the glass plate and bend-breaks the edge portion of the glass plate, and a support device that is positioned on a side of a lower surface of the glass plate and supports the glass plate,
• the bend-breaking device includes a bend-breaking cutter wheel that forms an end cutting line on an outer side of a contour cutting line formed at the edge portion of the glass plate, a first pressing member that presses a main body portion of the glass plate extending to an inner side of the contour cutting line downward, a second pressing member that presses the edge portion of the glass plate extending to the outer side of the contour cutting line downward, a first raising/lowering mechanism that raises and lowers the bend-breaking cutter wheel in an up-down direction, a second raising/lowering mechanism that raises and lowers the first pressing member in the up-down direction, and a third raising/lowering mechanism that raises and lowers the second pressing member in the up-down direction,
• the support device includes a first support member that supports the main body portion of the glass plate, a second support member that supports the edge portion of the glass plate, and a fourth raising/lowering mechanism that raises and lowers the second support member in the up-down direction, and
• the bend-breaking processing method includes a cutter wheel raising step of raising the bend-breaking cutter wheel in the up-down direction by the first raising/lowering mechanism after the bend-breaking cutter wheel lowered in the up-down direction by the first raising/lowering mechanism forms an end cutting line at the edge portion of the glass plate, a glass plate sandwiching step of lowering the first pressing member in the up-down direction by the second raising/lowering mechanism so that the first pressing member and the first and second support members sandwich the main body portion and the edge portion of the glass plate, a second support member lowering step of lowering the second support member in the up-down direction by the fourth raising/lowering mechanism after the first pressing member and the first and second support members sandwich the main body portion and the edge portion by the glass plate sandwiching step, and an edge portion bend-breaking step of lowering the second pressing member in the up-down direction by the third raising/lowering mechanism and presses the edge portion of the glass plate extending to the outer side of the contour cutting line downward while maintaining the sandwiching of the main body portion by the first pressing member and the first support member and bend-breaks the edge portion of the glass plate.