Apparatus for operating main shaft of machine tool

An apparatus for operating a main shaft of a machine tool, the apparatus comprising:

• an input unit configured to transmit power for operating the main shaft;
• an output unit disposed in parallel with the input unit and configured to operate the main shaft with the power from the input unit;
• and
• a transmission unit disposed in parallel with the input unit and the output unit so as to be capable of rectilinearly reciprocating between the input unit and the output unit and configured to transmit the power from the input unit to the output unit,
• wherein,
• the main shaft is capable of operating in a high-speed mode, a low-speed mode, and a C-axis mode in accordance with the rectilinear reciprocation of the transmission unit,
• the input unit and the transmission unit operate at the same time by gear engagement, and the transmission unit and the output unit operate at the same time by gear engagement, and
• a rectilinear reciprocation distance of the transmission unit is changed in accordance with the high-speed mode, the low-speed mode, or the C-axis mode of the main shaft, and the arrangement of the gear engagement between the transmission unit and the input unit and the arrangement of the gear engagement between the transmission unit and the output unit are changed in accordance with the change in rectilinear reciprocation distance of the transmission unit.