Patent ID: 6974284

Claim:
A cutter driving apparatus to be incorporated into a boring machine, the cutter driving apparatus comprising: a spindle rotating around its own axis, wherein the spindle has a cutter attached thereto; a moving member moving along the axis of the spindle, wherein the spindle moves integrally with the moving member along the axis of the spindle, and wherein the moving member has an peripheral part disposed apart from the spindle; a transmission member transmitting a power to the moving member so as to move the moving member along the axis of the spindle, wherein the transmission member transmits the power to the moving member through the peripheral part; and an operation member, attached to the transmission member, wherein the operation member is operated so as to move the moving member through the transmission member, wherein the operation member is removably attached to the transmission member, wherein one of the transmission member and the operation member is a first member, and the other one of the transmission member and the operation member is a second member, wherein the first member includes a movable part, wherein, where the operation member is attached to the transmission member, the movable part moves between an engaging position where it is engaged with the second member and a non-engaging position wherein it is not engaged with the second member, wherein, when the movable part is located at the engaging position, the operation member is not disengageable from the transmission member, and therein, when the movable part is located at the non-engaging position, the operation member is disengageable from the transmission member.