Dmg Mori Seiki Co., Ltd.

Mori Seiki Co., Ltd.

Kazuya Fujioka

Kaoru Yasumatsuya

Katsuhito Miyahara

Yohei Shinkai

Akihiro Mochizuki

Hidenori Saraie

Takahiro Nishiki

A machine tool having a turning function and a milling function includes a spindle, a spindle housing supporting the spindle in a rotatable manner, a main clamp provided at the spindle, an auxiliary clamp provided at the spindle housing, and a double arm with a first gripper and a second gripper. The auxiliary clamp clamps a tool holder together with the main clamp during fixing a fixed tool. The double arm exchanges a tool holder grasped at the first gripper for another tool holder grasped at the second gripper by rotating and sliding movements. The auxiliary clamp is arranged at a position not interfering with the double arm that moves during exchanging tool holders. By such a configuration, a machine tool achieving a clamping force sufficient to withstand the load during a turning process, and that allows tool exchange in a short period of time, and a tool holder employed in such a machine tool, can be provided.

Machine tool and tool holder

A bearing unit capable of withstanding a large axial force based on a simple structure including: a bearinghaving an internal ringfitted to an inside member, an outer ringfitted to an outside member, lots of rolling elementsdisposed between the outer ringand the inner ring; and a transmitting direction shifting means A transmitting an axial force F from the inner ringto the outside memberwhen the axial force F transmitted from the inside memberto the internal ringexceeds a predetermined value or above, and a main spindle device of a machine tool, which is provided with the bearing unit, are provided.

Bearing unit and main spindle device of machine tool provided with bearing unit

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Yamatokoriyama, Japan

Kazuya Fujioka