| 摘要 |
A polishing head comprises first tool-holding shafts (9) rotating in a first rotating direction (L) and associated with first transmission means (21, 26, 50), and second tool-holding shafts (20) rotating in a second rotating direction (M) opposite said first rotating direction (L) and associated with second transmission means (18, 30, 51), said first transmission means (21, 26, 50) and said second transmission means (18, 30, 51) being such that said first tool-holding shafts (9) and said second tool-holding shafts (20) have cutting speeds that are not too different from one another as absolute values. |
