A bend-breaking system that bend-breaks an edge portion of a glass plate to be processed, the bend-breaking system comprising:
- 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 including:
- a bend-breaking cutter wheel that forms an end cut line on an outer side of an outline cut line formed in the edge portion of the glass plate;
- a first pressing member that is positioned in the vicinity of a radially outer side of the bend-breaking cutter wheel and presses the edge portion of the glass plate extending outside the outline cut line downward;
- a second pressing member that is positioned in the vicinity of a radially outer side of the first pressing member and presses a main body portion of the glass plate extending inside the outline cut line downward;
- a first lifting mechanism that lifts the bend-breaking cutter wheel up and down in an up-down direction;
- a second lifting mechanism that lifts the first pressing member up and down in the up-down direction;
- a third lifting mechanism that lifts the second pressing member up and down in the up-down direction;
- and a rotation mechanism that rotates the bend-breaking cutter wheel and the first and second pressing members in an axial direction, and the support device including:
- 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 lifting mechanism that lifts the second support member up and down in the up-down direction, wherein
- the bend-breaking system includes:
- a cutter wheel raising means in which, after the bend-breaking cutter wheel lowered in the up-down direction by the first lifting mechanism forms the end cut line in the edge portion of the glass plate, the bend-breaking cutter wheel is raised in the up-down direction by the first lifting mechanism;
- a rotating means in which, after the bend-breaking cutter wheel is raised by the cutter wheel raising means, the bend-breaking cutter wheel and the first and second pressing members are rotated in the axial direction by the rotation mechanism so that the first pressing member is positioned in the edge portion of the glass plate extending outside the outline cut line;
- a glass plate clamping means in which, after the bend-breaking cutter wheel and the first and second pressing members are rotated by the rotating means and the first pressing member is positioned in the edge portion of the glass plate extending outside the outline cut line, the second pressing member is lowered in the up-down direction by the third lifting mechanism and the second pressing member and the first and second support members clamp the main body portion and the edge portion of the glass plate;
- a second support member lowering means in which, after the second pressing member and the first and second support members clamp the main body portion and the edge portion by the glass plate clamping means, the second support member is lowered in the up-down direction by the fourth lifting mechanism;
- and an edge portion bend-breaking means in which the first pressing member is lowered in the up-down direction by the second lifting mechanism and presses the edge portion of the glass plate extending outside the outline cut line downward to bend-break the edge portion while maintaining clamping of the main body portion by the second pressing member and the first support member.