RECORDING MEDIUM CARTRIDGE LIBRARY APPARATUS

摘要

PURPOSE: To position a cartridge transfer body with high accuracy in a designated storing cell of a storing body without taking costs. CONSTITUTION: Each storing position 3 of a storing body is defined by a pair of side wall parts 8 and a bottom wall part 9. The transfer body has a reflecting-type photosensor moving integrally therewith. At each storing position 3, an external face of the side wall part is a first detection face 8A detectable by the photosensor when the transfer body moves in a first direction, and an external face of the bottom wall part, is a second detection face 9A detectable by the photosensor when the transfer body moves in a second direction. In this manner, external faces of the side wall parts and bottom wall part can function by themselves as an optical position marker to be detected by the photosensor.