| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To surely and promptly release a ratchet mechanism even in the case the lock force of the ratchet mechanism is different. <P>SOLUTION: A release assist control section 52 driving a motor section 81 so as to rotate the drum in a pulling in direction of a belt when releasing and controlling the ratchet mechanism and stopping the drive of the motor section 81 when a detecting signal Ds from a rotation sensor 96 is input is arranged in the controller 50, a map 52a (a first duty map) determining the magnitude of driving current to the motor section 81 when releasing and controlling is arranged in the release assist control section 52, and the map 52a is set such that the increasing ratio of a duty ratio is raised with the lapse of the time of the releasing control. It is possible to surely and promptly release the ratchet mechanism because the rotational torque of the motor section 81 rotating the drum in the pulling in direction of the belt is increased according to the increase of the duty ratio even in the case the lock force of the ratchet mechanism is different. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
