Library apparatus that corrects relative position displacement b

Details Library apparatus that corrects relative position displacement b Library apparatus that corrects relative position displacement b

1996-08-29

1998-08-04

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 92, G11B 1518, G11B 1568

Patent

active

057903387

ABSTRACT:
A library apparatus has a recording and reproducing unit and a storing rack having a number of shelves each adapted to store a recording medium and a carry robot is moved between shelves of the storing rack or between the recording and reproducing unit and a shelf of the storing rack to load/unload a target recording medium to/from a shelf or the recording and reproducing unit. A photosensor is mounted to the tip of a hand of the carry robot. The carry robot is moved to the target shelf in two-step control. Namely, a robot controller calculates the position of the target shelf and moves the robot to the calculated position in a coarse control. Then, a position of a framework relating to the target shelf of the storing rack is detected accurately based on the signal from the photosensor and a position recognition controller determines a displacement of an actual position of the target shelf from the calculated position to apply positional correction to the target position and causes the robot controller to position the robot hand to the actual position in a fine control. Resulting position correction information is stored in a storing rack position information memory to decrease the operation time in the second and ensuing positioning operations.

REFERENCES:
patent: 5303034 (1994-04-01), Carmichael et al.
patent: 5331232 (1994-07-01), Moy et al.
patent: 5429470 (1995-07-01), Nicol et al.

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