速度调节器(52、105)确定电动机的目标旋转速度，该目标旋转速度相应于膜的预定基准输送速度。
A speed adjuster (52, 105) determines a target rotational speed of the motor corresponding to a predetermined reference transport speed of the film.
ECU(20)根据传感器信号在预定时间内计算出曲轴(17)的旋转速度。
The ECU (20) calculates a rotation speed of a crankshaft (17) in a predetermined period based on the sensor signal.
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