| 摘要 |
PROBLEM TO BE SOLVED: To take measures against shift of a mold without increasing restriction force for fixing the mold. SOLUTION: When the position of a mold 12 is determined in a drawing (a), a first detection switch 25 is placed above the mold 12 so as to leave an interval of a distance L1, and a second detection switch 35 is placed on the axial line crossing the axial line 27 of the first detection switch 25 at a right angle or at an almost angle at the position of the distance L1 from the mold 12. When the mold 12 is rotated in a drawing (b), the distance between the second detection switch 35 and the mold 12 changes to L3 (or L2) and, accordingly, the second detection switch 35 detects an abnormal state. Since a measure for stopping operation can be taken by detecting the shift of a mold, the generation of trouble such as the damage of the mold or the like can be prevented and, as a result, the restiction force for fixing the mold can be suppressed properly.
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