A machine tool includes a spindle including a tool insertion portion having a shape of an opening into which a shank of a tool is inserted and configured to attach the tool thereto, a tool change unit configured to change the tool attached to the spindle while gripping the tool, an air supply unit configured to supply air to a gap between the tool insertion portion and the shank of the tool when the tool change unit changes the tool, and a controller configured to control driving of at least any one of the spindle and the tool change unit to allow the tool and the tool insertion portion to reciprocate relative to each other in a predetermined direction with the shank of the tool inserted into the tool insertion portion and with a gap provided between the tool insertion portion and the shank of the tool.

A tool changer is composed of a support shaft, a forward/backward movement drive motor moving the support shaft upward and downward, a rotation drive motor rotating the support shaft about an axis, a tool change arm having tool grippers formed at both ends thereof, and an air blow mechanism discharging compressed air to a tool and a next tool gripped by the tool grippers. In tool change using this tool changer, in a positioning operation, the tool change arm is rotated by degrees and compressed air is discharged toward the tool and the next tool by the air blow mechanism.

A tool changer includes a tool magazine, a support shaft disposed to have a center axis parallel to an axis of a tool spindle, a drive mechanism for rotating the support shaft about the center axis and moving the support shaft in the axial direction, three tool change arms fixed to the support shaft and each having a tool holding unit, a tool transfer mechanism for transferring a tool pot from the tool magazine to a standby position, and a provisional placing pot disposed at a provisional placing position. The tool changer starts a tool change operation in a state where a tool to be attached to the tool spindle, a tool to be used next, and a tool to be used after the next tool are held by the tool holding units of the tool change arms.

A machine tool includes a rotatable spindle, a spindle drive, a tool magazine, a tool changer including a rotating shaft, a rotating shaft drive motor, an angular position detector, a tool change arm having gripping units at both ends, and a controller. After interchanging a first tool mounted on the spindle and a second tool held in a tool pot, when rotating the tool change arm to an intermediate position, rotation of the spindle is started as soon as the second tool mounted on the spindle and the gripping unit are out of contact with each other.

A machine tool includes a rotatable spindle, a spindle drive, a tool magazine, a tool changer including a rotating shaft, a rotating shaft drive motor, an angular position detector, a tool change arm having gripping units at both ends, and a controller. After interchanging a first tool mounted on the spindle and a second tool held in a tool pot, when rotating the tool change arm to an intermediate position, rotation of the spindle is started as soon as the second tool mounted on the spindle and the gripping unit are out of contact with each other.

A tool changer 10 includes a tool change arm 40 having tool holding portions 42, 52 at ends thereof, a support shaft supporting the tool change arm 40, a rotation mechanism including a rotation drive motor 25 and rotating the tool change arm 40 about an axis of the support shaft, a forward/backward movement mechanism including a forward/backward movement drive motor 13 and moving the tool change arm 40 forward and backward along the support shaft, and a mount base 11 having the rotation drive motor 25, the forward/backward movement drive motor 13 and the support shaft mounted thereon. The tool changer has a restraining member 60 provided thereon which restrains movement of the tool change arm 40 in a direction along the support shaft by engaging with the tool change arm 40 positioned at an original position.

A cutting tool cover set to a cutting tool which includes a hollow shaft body and at least one insert attached to an end face of the shaft body and cuts by bringing the insert into contact with a work while rotating the shaft body. The cutting tool cover includes: a body portion fixed to a top end portion of the shaft body; and an extension portion extended outward from the circumferential edge of the body portion in the entire circumference of the top end portion of the body portion to cover the surface of the work.

A tool changer is composed of a support shaft, a forward/backward movement drive motor moving the support shaft upward and downward, a rotation drive motor rotating the support shaft about an axis, a tool change arm having tool grippers formed at both ends thereof, and an air blow mechanism discharging compressed air to a tool and a next tool gripped by the tool grippers. In tool change using this tool changer, in a positioning operation, the tool change arm is rotated by degrees and compressed air is discharged toward the tool and the next tool by the air blow mechanism.

A tool changer includes a tool magazine, a support shaft disposed to have a center axis parallel to an axis of a tool spindle, a drive mechanism for rotating the support shaft about the center axis and moving the support shaft in the axial direction, three tool change arms fixed to the support shaft and each having a tool holding unit, a tool transfer mechanism for transferring a tool pot from the tool magazine to a standby position, and a provisional placing pot disposed at a provisional placing position. The tool changer starts a tool change operation in a state where a tool to be attached to the tool spindle, a tool to be used next, and a tool to be used after the next tool are held by the tool holding units of the tool change arms.