To prevent a punch and a die from being stopped while biting paper by forming the drive pattern of a punch drive pulse motor with a trapezoidal drive corresponding to one rotation of a punching means and a prescribed low-speed pulse succeeding it, and stopping the drive when a home position is detected.
The rear end of paper being conveyed is detected (S1), a trapezoidal drive pattern corresponding to one rotation of a punching drive pulse motor is implemented after the detection (S2), and the whole device is stopped for a jam process after the completion of the implementation is confirmed (S3). When the prescribed pattern is not completed (S3), the home position of a punch is detected (S5), the drive is stopped after the detection (S6), and the process to detect the rear end of the paper is resumed (S1). When the home position of the punch is not detected (S5), the trapezoidal pattern corresponding to one rotation of the punching drive pulse motor is again implemented (S2).
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OKAMOTO KIYOSHI
MORIYAMA TAKESHI
