Sodick Co., Ltd.

Takahiro Nakamura

Kenji Yamada

Shinichi Murayama

A locking device ( ) for an indexable spindle ( ) to which a tool electrode is attached, comprises a brake disk ( ) fixed to the spindle, an annular upper brake member ( ) movable in the axial direction of the spindle between a first position and a second position closer to the brake disk than the first position, a annular lower brake member ( ) movable in the axial direction of the spindle between a third position and a fourth position closer to the brake disk than the third position, an upper disk ( ) arranged facing upper surface of the brake disk across a minimum gap when the upper brake member is at the first position, a lower disk ( ) arranged facing lower surface of the brake disk across a minimum gap when the lower brake member is at the third position, and drive means for moving the upper and lower brake members in the axial direction of the spindle. When the upper brake member is at the second position and the lower brake member is at the fourth position, the upper and lower brake members press the upper and lower disks against the brake disk to lock the spindle.

Indexable spindle locking device

The main spindle ( A) for the main spindle device of a diesinker electric discharge machine is connected to a high rotor inertia, high output servo motor ( ) without passing through a speed reducer; the servo motor ( ) is equipped with a high resolution encoder ( ). A main spindle rotation speed detection signal is detected by the encoder ( ) when the main spindle ( A) is rotating in the high speed mode, and a main spindle angle position and rotation speed detection signal are detected when the main spindle ( A) is being angle divided, and these signals are fed back to the servo motor ( ) motor driver ( ). High speed rotational control and angle position precision angle division control are accomplished by a single servo motor and a single encoder.

Growing community of inventors

Fukui, Japan

Takahiro Nakamura