Chuck device and machine tool having the same

A machine tool comprising:

• a machine having first and second sides opposite to each other in a direction;
• a first chuck device mounted on said first side of said machine, said first chuck device including
• a first tubular housing formed with a first axial hole that has a hole axis parallel to the direction,
• a first center unit disposed fixedly in said first axial hole in said first tubular housing, extending along the hole axis, and having a first tip extending outwardly of said first tubular housing and adapted to abut against a center of an end of a workpiece,
• a first chuck unit disposed movably in said first axial hole in said first tubular housing, sleeved on said first center unit, and including a first chuck member disposed adjacent to said first tip of said first center unit, and
• a first sleeve unit disposed movably in said first axial hole in said first tubular housing, concentric with said first tubular housing and sleeved on said first chuck unit, said first sleeve unit having a first pushing end portion sleeved on and abutting against said first chuck member of said first chuck unit, said first sleeve unit being operable to move relative to said first tubular housing along the hole axis such that said first chuck member of said first chuck unit is driven by said first pushing end portion of said first sleeve unit with movement of said first sleeve unit to move away from first tubular housing and to clamp the end of the workpiece;
• and
• a second chuck device mounted on said second side of said machine, said second chuck device including
• a second tubular housing formed with a second axial hole that has the hole axis,
• a second center unit disposed movably in said second axial hole in said second tubular housing, extending along the hole axis and having a second tip, said second center unit being operable to move relative to said second tubular housing along the hole axis between a normal position, where said second tip is spaced apart from the other end of the workpiece, and an abutting position, where said second tip moves away from said second tubular housing and toward said first chuck device so as to abut against a center of the other end of the workpiece;
• a second chuck unit disposed movably in said second axial hole in said second tubular housing, sleeved on said second center unit, and including a second chuck member disposed adjacent to said second tip of said second center unit, and
• a second sleeve unit disposed movably in said second axial hole in said second tubular housing, concentric with said second tubular housing and sleeved on said second chuck unit, said second sleeve unit having a second pushing end portion sleeved on and abutting against said second chuck member of said second chuck unit, said second sleeve unit being operable to move relative to said second tubular housing along the hole axis such that said second chuck member of said second chuck unit is driven by said second pushing end portion of said second sleeve unit with movement of said second sleeve unit to move away from said second tubular housing and to clamp the other end of the workpiece.