STAR MICRONICS CO., LTD.

An NC lathe including a first spindle, a second spindle capable of holding a cut-off workpiece delivered from the first spindle, a second tool post on which a plurality of tools are attachable to machine the workpiece held by the second spindle, a product receiver provided on the second tool post, a Y2-axis motor capable of moving at least one of the second tool post and the second spindle in a Y2-axis direction, and an X2-axis motor capable of moving at least one of the second tool post and the second spindle in an X2-axis direction. The second tool post has a plurality of tool mounting parts where the tools are attachable. The tool mounting parts are aligned at intervals in the Y2-axis direction. At least one of the tool mounting parts is arranged in a position overlapping the product receiver with respect to the X2-axis direction.

A machine tool system capable of decreasing the operator's burden in setting the parameters. A machine tool system includes a working machine capable of machining a bar and a bar feeder capable of delivering the bar to the working machine according to the machining of the bar. The bar feeder delivers the bar in accordance with a set parameter. The bar feeder updates the parameter according to parameter information transmitted from the working machine.

A machine tool system of the present invention includes a rotatable spindle capable of releasably gripping a bar, a pusher that biases the bar from a rear end thereof toward a front end thereof to be movable together with the bar in a Z1-axis direction thereof, and an abnormality determining unit that determines whether an abnormality occurs by monitoring movement of the pusher in the Z1-axis direction. The spindle is movable in the Z1-axis direction, and the abnormality determining unit determines that a first abnormality occurs when the moving distance of the spindle differs from the moving distance of the pusher in a state that the spindle grips the bar.

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.

Provided is a machine tool and a method for controlling the machine tool capable of precisely determine a success or a failure of a cut-off. An NC lathe performs a cut-off of a workpiece gripped by a first spindle and a second spindle and then performs a separation movement of the second spindle in a direction separating from the first spindle. The NC lathe includes a movement controlling unit adapted to perform a stop control of the first spindle at a command position of the first spindle during the separation movement of the second spindle and a cut-off success or failure determining unit adapted to monitor a positional deviation of the first spindle during the separation movement of the second spindle to determine a success or a failure of the cut-off, the positional deviation being a difference between the command position and an actual position of the first spindle.

A machine tool capable of facilitating the setting of the vibration cutting conditions. A control unit acquires a feed speed of a object to be fed without a vibration (Fa), a number of rotations of a spindle required for a single cycle of the vibration (K), and a returning amount (R) representing a distance of a returning feed per the single cycle of the vibration. According to the acquired parameters, the control unit decides at least one parameter among a cutting amount (D) representing a distance of a change in a position of the object per the single cycle of the vibration, a cutting feed speed (F) of the object, and a returning feed speed (B) of the object. The control unit controls the position of the object to be fed with the vibration at least according to the decided parameter.

The machine tool includes a second spindle rotatable about a second spindle axis while gripping a cut-off portion of a workpiece, a second tool post to which a rotary tool that machines the cut-off portion of the workpiece gripped by the second spindle is attached, and a second tool post base that supports the second tool post, in which the second tool post includes a power transmission mechanism that transmits a driving force for rotationally driving the rotary tool, a base table, and a tool mounting member to which the rotary tool is attached, the power transmission mechanism is disposed between the base table and the tool mounting member, a back side of the base table faces the second tool post base and the tool mounting member is disposed on a front side of the base table, and the tool mounting member is detachably attached to the base table.

A machine tool capable of preventing production of a defective product. The processing unit determines whether the workpiece exists in the predetermined area. In the event that the workpiece exist in the area, the processing unit execute the top cut process. In the event that the workpiece does not exist in the area, the processing unit determines that the workpiece is in the abnormal position.

A drawer control apparatus capable of precisely discriminating whether the drawer open state is triggered by the drawer open command process or otherwise. The drawer control apparatus includes a command receiving unit, a drawer connection detecting unit, a command processing unit, a drawer open/closed signal receiving unit, and an open trigger discriminating unit. The command processing unit executes a drawer open command process upon receiving a drawer open command. The drawer open command process includes sending a drawer open signal and setting a process execution flag upon detecting presence of drawer connection. The drawer open command process ends upon detecting absence of drawer connection. The open trigger discriminating unit discriminates whether the drawer open state is triggered by the drawer open command process or otherwise according to a set state of the process execution flag upon receiving a signal representing the drawer open state.

A printer provided with a storing space for a paper roll having a core hole in the center includes a paper roll holder having a protrusion adapted to fit into the core hole of the paper roll. The paper roll holder is switchable between a protruded state that the protrusion protrudes into the storing space and a retracted state that the protrusion retracts from the storing space. The printer further includes a stopper adapted to engage with the paper roll holder while the paper roll holder is in the protruded state to prevent the protrusion from turning to a predetermined direction. The paper roll holder moves when pushed by the paper roll that is being set into the storing space. Movement of the paper roll holder releases the engagement with the stopper to allow the protrusion to turn to the predetermined direction.