| 摘要 |
PROBLEM TO BE SOLVED: To efficiently change a die by inputting a skip command and a jump command in statements which are actually executed, and preparing the die in advance to a die change preparing position before executing the die change command. SOLUTION: A work program reading part 41 reads all work programs, and a die change schedule preparation part 43 prepares a die change schedule based on branch information such as the dies which are successively used in the read work program, the jump command and the skip command, and stores the schedule in a second memory part 45. A die change control unit 25A moves the die to the die change preparation position A based on the die change schedule. When a user inputs the branch change command from a branch change command input part 49 during the working, a branch change command part 51 gives a command to the die change control unit 25A to return the die before the change to an original one, and to reprepare a correct die.
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