Patent ID: 6830505
Filing Date: 2004-12-14
Classification: B24B

Abstract:
A polishing machine, comprising:an upper polishing plate for polishing upper faces of work pieces; a lower polishing plate for polishing lower faces of the work pieces; means for rotating at least one of said polishing plates; a plurality of carriers being provided around a center of gravity of said upper polishing plate and sandwiched between said polishing plates, each of said carriers having a through-hole, in which the work piece is accommodated; means for independently performing circular motion or swing motion of said carriers without revolving on their own axes; and means for controlling said performing means, whereby centers of gravity of the work pieces, which are held by said carriers, are simultaneously moved close to a center of gravity of said upper polishing plate and simultaneously moved away therefrom, and moving distances of the centers of gravity of the work pieces are equal while the circular motion or the swing motion of said carriers.