Patent ID: 9296099
Filing Date: 2016-03-29
CPC Classification: B23B,B24B,B25F,H02K

Claim Text:
1. A small machine tool, comprising: a hollow housing including a holding portion and an aperture run through by a tool head; a holder including a coupling portion which is connected to the holding portion and restricted a movement thereof by the holding portion, a hollow shaft tube shared an axis with the aperture, an ancillary support member located in the hollow shaft tube and a plurality of ancillary rotary members located in the hollow shaft tube, wherein the ancillary support member and the plurality of ancillary rotary members are located at two different sides of the coupling portion; and a driving unit including a stator coupled with the hollow shaft tube to receive electricity to generate a magnetic force, a spindle, which is coaxial with the aperture, running through the hollow shaft tube, the ancillary support member and the plurality of ancillary rotary members, and a rotor suspended located outside the stator and driven by the magnetic force to rotate, wherein the rotor is supported only by the spindle; wherein the spindle has a first end which runs through the ancillary support member and is braced by the ancillary support member, and a second end which runs through the plurality of ancillary rotary members and is braced by the plurality of ancillary rotary members, the first end of the spindle is directly coupled to and coaxial with the tool head, the second end of the spindle is coupled with the rotor and braces the rotor; and wherein the spindle is driven by the rotor and is supported by the ancillary support member and the plurality of ancillary rotary members to spin steadily after the stator has received electricity to drive the rotor to rotate.