Patent ID: 11940086
Assignee: YAMAZAKI MAZAK CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B  F | IPC F

Claim 11:
12. A machine tool comprising:
a table on which a workpiece is placed;
a tool holding member configured to hold a tool to machine the workpiece;
a second driver configured to move the tool holding member; and
a table rotation device configured to rotate the table and comprising:
a bearing assembly comprising:
a fixed ring provided around a rotation axis;
a movable ring provided coaxially with the fixed ring to face the fixed ring; and
rolling elements provided between the fixed ring and the movable ring so that the movable ring is rotatable about the rotation axis with respect to the fixed ring;

a table support member supporting the table and connected to the movable ring so as to fix a position of the table support member relative to a position of the movable ring;
a first driver configured to rotate the table support member about the rotation axis;
a support block connected to the fixed ring so as to fix a position of the support block relative to a position of the fixed ring; and
a cooling block connected to at least one of the fixed ring and the support block such that the cooling block is in contact with both the fixed ring and the support block, the cooling block providing a cooling passage.