PROBLEM TO BE SOLVED: To bring a retreat unit close to a drive unit smoothly by controlling driving time based on the moving speed of the retreat unit obtained by measuring the time passing through a retread sensor when the retreat unit is move to the front of the drive unit. ;SOLUTION: In the retreat unit 25, a take-in roller 31 is rotated, and the roller 31 is stopped after prescribed time has elapsed. Thus, the unit 25 is retreated, and after a prescribed time has elapsed, retreat operation is stopped, and a storage medium confirmation sensor confirms the presence of the storage medium 22. When the roller 31 takes in and holds the storage meidum normally, since the sensor 33 is in ON state as it is, the rotation of the roller 31 is re- started, is after the housing of the medium 22 is confirmed, the rotation of the roller 31 and stopped. The unit 25 re-starts the retreat again, and stops the retreat when arriving at an end terminal of a retreat position A, and the retread operation is ended. On the other hand, when the housing of the medium 12 can not be confirmed, the roller is continuedl to be rotated up to the time over, and the housing of the medium is confirmed again, but when time is over, the roller 31 is stopped, and abnorma processing if performed.;COPYRIGHT: (C)1997,JPO
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