| 摘要 |
PURPOSE:To improve accuracy of a product, by maintaining stabilized accuracy of a main spindle bearing always by the controller of a chuck. CONSTITUTION:While one side of two levels 10 and 12 is working for releasing a holding operation of a collet 5 through hinging movement in directions of the two levers 10 and 12 opposing with each other, one end of the other lever is connected so as to absorb a load in an axial direction of a main spindle working through the holding operation. With this, the load in the axial direction of a main spindle bearing is removed, not only the backlash of the main spindle but also the generated heat of the main spindle are removed and accuracy of the work can be improved through stabilized revolution of the main spindle. |
