| 摘要 |
PROBLEM TO BE SOLVED: To dispense with time required to change tools while suspending the rotation of a spindle. SOLUTION: This machine tool a spindle changing means is composed of a back and forth table 12 movable in the horizontal direction on a bed 11 and a right and left table 13 movable in the direction of intersecting the table 12 at right angles and a column 14 erected on the right and left table 13 and a column 14 turnable on a horizontal plane and a first spindle head 15 vertically movable along the column 14, a second spindle head 16 provided on a location (the location on 180-degree opposite side) different from that of the spindle head 15 and vertically movable independent of the first spindle head 15 along the column 14, a first spindle 17 and a second spindle 18 installed on the first spindle head 15 and the second spindle head 16, respectively, and a tool changing arm 22 changing a tool 21 in the second spindle 18, and a tool magazine 24 mounted or the upper part of the column 14 and housing many tools 23.
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