| 摘要 |
A device for correcting audio record's groove eccentricity consists of an arm mounted on one end on a base and having on the opposite end a pin-like device which can track the audio record grooves. On this later end of the arm also mounts an extension arm. A monitoring device which has parallel marking lines on its top is placed under the free end of the extension arm. When the groove tracking device starts tracking the record grooves the eccentric rotation of the record grooves causes a left-right motion of the groove tracking means. This motion is then enlarged by the extension arm and displayed in relation to the parallel marking lines on the stationary monitoring device. Once the direction and amount of the eccentricity is depicted the turntable should be brought to a stop. To correct the eccentricity the record should be moved across its horizontal platter surface in the opposite direction where the maximum eccentricity was detected. To allow such movement of the record a reemer-type device can be used to enlarge the center hole of the record. Enlarging the record's central hole has two advantages: firstly, it allows a complete center error correction, secondly, the contact between the spindle and the record is thereby avoided and this causes the noises and vibrations which are ordinarily transmitted to the record through its contact with the spindle shaft to be eliminated.
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