Patent ID: 7715284
Filing Date: 2010-05-11
Classification: G11B

Abstract:
1. A cassette library apparatus, comprising: a picker for withdrawing a cassette from a housing and pushing such cassette into such housing, such a cassette having a recess on a bottom portion of the cassette; wherein the picker comprises: a swing frame swingable up and down about an axis, a swing arm connected to the swing frame and swingable integrally with the swing frame, an engaging part located at a tip end of the swing arm for engaging a recess of such a cassette to chuck such cassette when the swing arm is swung upward to a specific posture, a swing mechanism for swinging the swing frame and the swing arm, a stepping motor for driving the swing mechanism, a detector for detecting when the swing arm is in the specific posture and such cassette is chucked by the swing arm, and for detecting when the swing arm is in at least a second posture by counting a number of pulses to be supplied to the stepping motor when the swing arm deviates from the specific posture as driven by the stepping motor.