Disk-type recording and reproducing apparatus

摘要

A disc-type recording and reproducing system in which only a single motor is required for rotating the disc and for moving a magnetic head radially with respect to the disc. The system includes a continuously rotating body, a coupling rotary body rotated by the continuously rotating body, a subordinate rotary body rotated by the continuously rotated body, and a cam having a head-moving cam surface whose diameter changes in steps and engagement recesses corresponding to each diameter step rotatably holding the coupler rotary body. A head movement control mechanism is engageable with the engagement portion of the cam for controlling the rotation of the cam and allowing the subordinate rotary body to continue rotating while the head is not moving. The head control device releases control of the rotation of the cam and controls rotation of the subordinate rotary body while the head is moving.