| 摘要 |
PURPOSE:To prevent the eccentric revolution of a record in its play mode, by putting a record on a mobile rotary disk, moving the disk to obtain the coincidence between the center of the record and the rotary center of a turntable and then fixing the rotary disk to the turntable. CONSTITUTION:When a turntable 15 is rotated, a float-up plate rotates together with the turntable in the same direction as a record 38. The oil is supplied between a depressed part and the float-up plate to improve the lubricity of the depressed part, float-up plate, rotary shaft, etc. Thus the variance of revolution of the turntable is prevented. At the same time, the record 38 rotates with revolutions of the turntable. Then an end groove 38a has vibrations by an amount equivalent to the eccentricity to the rotary center of the turntable. This vibration of the groove 38a is detected by an eccentricity detecting part, and this detecting signal actuates a rotary solenoid 46. As a result, a driving shaft 47 and a cam 48 rotate gradually toward an arrow B. Then a roll 54 is pushed out, and the rotary disk moves on the turntable via an arm 49, a roll 51 and a ring 25. As a result, the position of the record 38 is corrected so as to obtain the coincidence between the center of the record 38 and the rotary center of the turntable 15. |
