A spindle apparatus for use at a machine tool, in particular a lathe, has: a spindle assembly including a workpiece spindle to receive an elongated workpiece and a spindle motor for driving spindle rotation; and a rotary guide-bush assembly axially arranged with the workpiece spindle, the rotary guide-bush assembly including a rotary guide-bush to receive the elongated workpiece and supported at the rotary guide-bush assembly to rotate with the elongated workpiece received in the workpiece spindle about the axis while enabling a movement of the elongated workpiece in the axial direction. The spindle and rotary guide-bush assemblies connect to each other by a torque transferring connection, between the spindle and rotary guide-bush assemblies along the axis to transfer driving torque during acceleration or deceleration of the spindle rotation driven by the spindle motor to the rotary guide-bush of the rotary guide-bush assembly.

A spindle apparatus for use at a machine tool, in particular a lathe, has: a spindle assembly including a workpiece spindle to receive an elongated workpiece and a spindle motor for driving spindle rotation; and a rotary guide-bush assembly axially arranged with the workpiece spindle, the rotary guide-bush assembly including a rotary guide-bush to receive the elongated workpiece and supported at the rotary guide-bush assembly to rotate with the elongated workpiece received in the workpiece spindle about the axis while enabling a movement of the elongated workpiece in the axial direction. The spindle and rotary guide-bush assemblies connect to each other by a torque transferring connection, between the spindle and rotary guide-bush assemblies along the axis to transfer driving torque during acceleration or deceleration of the spindle rotation driven by the spindle motor to the rotary guide-bush of the rotary guide-bush assembly.

An automatic lathe includes a positioning block that positions a rod material, the rod material projecting from a main spindle contacting the positioning block, and a sensor that moves in a direction intersecting with a shaft center C direction of the main spindle to detect a cut off condition of the rod material. The positioning block includes a groove that allows movement of the sensor, and moves in the same direction as a movement direction of the sensor between a position that contacts the rod material and a position that has no contact with the rod material. The sensor moves along the path in the position that has no contact with the rod material.

Provided is a machine tool capable of facilitating switching moving ranges of the moving unit. A moving-side cover provided on the moving unit covers part of a position of the driving apparatus in the moving direction. A supporting-side cover is provided in a position on a side of the first moving range of an end of the moving-side cover on a side of the second moving range in the moving direction to continuously cover the part of the position of the driving apparatus in the moving direction in cooperation with the moving-side cover in the first use state. The supporting-side cover forms a clearance in the moving direction with respect to the moving-side cover in the second use state. A slide cover is mounted on one of supporting-side cover and the moving-side cover slidably in the moving direction to close the clearance when slidably drawn out in the moving direction.

Provided is a machine tool capable of facilitating switching moving ranges of the moving unit. A moving-side cover provided on the moving unit covers part of a position of the driving apparatus in the moving direction. A supporting-side cover is provided in a position on a side of the first moving range of an end of the moving-side cover on a side of the second moving range in the moving direction to continuously cover the part of the position of the driving apparatus in the moving direction in cooperation with the moving-side cover in the first use state. The supporting-side cover forms a clearance in the moving direction with respect to the moving-side cover in the second use state. A slide cover is mounted on one of supporting-side cover and the moving-side cover slidably in the moving direction to close the clearance when slidably drawn out in the moving direction.

A machine tool includes a main spindle movably supported in an axial direction, and two gang tool posts disposed opposed to each other with an axis of the main spindle located therebetween. Each of the two gang tool posts is supported movably in X and Y directions that are perpendicular to the axial direction of the main spindle. Each of the two gang tool posts is provided with tools arranged parallel to each other in the Y direction. One of the two gang tool posts is movably disposed in a Z direction that is a same direction as the axial direction of the main spindle. Any one of the two gang tool posts is integrally provided with a turning tool base that turnably supports tools about a Y-axis along the Y direction.

Provided is a lathe capable of shortening the spindle. The lathe comprises a spindle, a spindle support which supports the spindle through a bearing on an outer side of the spindle, a collet disposed on a front end of the spindle, an inner ring holder provided on the spindle to hold a front of an inner ring of the bearing, an outer ring holder provided on the spindle support to hold a front of an outer ring of the bearing, a cap screwed into the spindle in front of the inner ring holder, and a cover detachably provided on the spindle support side. The cover has an inner circumferential surface facing an outer circumferential surface of the cap. A first air purging unit is provided between the inner circumferential surface of the cover and the outer circumferential surface of the cap.

An automatic lathe includes a positioning block that positions a rod material, the rod material projecting from a main spindle contacting the positioning block, and a sensor that moves in a direction intersecting with a shaft center C direction of the main spindle to detect a cut off condition of the rod material. The positioning block includes a groove that allows movement of the sensor, and moves in the same direction as a movement direction of the sensor between a position that contacts the rod material and a position that has no contact with the rod material. The sensor moves along the path in the position that has no contact with the rod material.

A machine tool includes a main spindle movably supported in an axial direction, and two gang tool posts disposed opposed to each other with an axis of the main spindle located therebetween. Each of the two gang tool posts is supported movably in X and Y directions that are perpendicular to the axial direction of the main spindle. Each of the two gang tool posts is provided with tools arranged parallel to each other in the Y direction. One of the two gang tool posts is movably disposed in a Z direction that is a same direction as the axial direction of the main spindle. Any one of the two gang tool posts is integrally provided with a turning tool base that turnably supports tools about a Y-axis along the Y direction.

The invention relates to a multi-spindle lathe comprising a machine frame, a spindle drum mounted on the machine frame so as to be rotatable about a spindle drum axis, workpiece spindles each arranged in a spindle position on the spindle drum and each mounted to be rotatable relative to the spindle drum about a workpiece spindle axis, said workpiece spindles being positionable by rotating the spindle drum about the spindle drum axis into different spindle stations which are arranged statically relative to the machine frame, for machining workpieces arranged in said workpiece spindles, wherein associated with each workpiece spindle is a workpiece guide bushing for guidance of a material bar held in the workpiece spindle for long turning, said material bar being arranged movably relative to the respective workpiece spindle in a direction parallel to the workpiece spindle axis.