At about 15:20 on November 17, the operator who works at the VS-2 ass’y line OP50# Insert Muffler Plate & one way valve Machine. During this operation, in the machine auto status, operator uses hands to touch the touching sensor, but the machine didn’t work. Operator thought maybe the part of sensor didn't detect the part, thus he wanted to replace the part. However, then machine suddenly move down, that wounded his finger. His left hand index finger front was ended fracture