Patent ID: 7047109

Claim:
A machinery comprising: a movable body, which is to be damped, that moves linearly in a direction of movement with respect to a main body; and an active damper for controlling an inherent vibration of the movable body occurring in the direction of movement of the movable body, the active damper comprising: a sensor, secured to the movable body, for detecting the inherent vibration currently occurring in the direction of movement of the movable body, among one or a plurality of inherent vibrations of the movable body; an actuator, secured to the movable body, for generating a vibration in the direction of movement of the movable body; and a controller for allowing the actuator to generate the vibration having a negative phase relationship with respect to the inherent vibration detected by the sensor; and a memory for storing a relationship between information, acquired beforehand in a state where the movable body is not being moved, relating to one or a plurality of inherent vibrations of the movable body, and a control information to the actuator that is optimum for generating the vibration having the negative phase relationship with respect to the inherent vibration of the movable body, and wherein the controller acquires, from the memory, the control information for the actuator that is optimum for damping the inherent vibration in the direction of movement detected by the sensor, and allows the actuator to generate the vibration based on the acquired control information.