| 摘要 |
PROBLEM TO BE SOLVED: To suppress resonance even when a resonance frequency to which a housing resonates is changed due to a placed object or an installation object, for example.SOLUTION: A printer 1 includes motors M1 and M2 in a casing 2, a mark sensor 8 that outputs a detection signal SG1 according to fluctuations in a resonance frequency to which the casing resonates, and a controller 30. When the controller determines that the resonance frequency of the casing fluctuated from a reference value on the basis of the detection signal SG1, it changes rotation speed of the motors M1 and M2, and performs changing processing for separating a frequency of an exciting force applied to the casing by the rotation of the motors M1 and M2 from the resonance frequency after the fluctuation. |
