Cutting tool feeding and rotating device for a machine tool

A cutting tool feeding and rotating device for a machine tool, comprising:

• a first mounting frame including a slide way which extends in an axial direction and which has front and rear ends opposite to each other in the axial direction;
• a tubular housing defining a first axis in the axial direction, including front and rear surrounding portions opposite to each other along the first axis, and having an inner tubular wall surface that confines a through hole which extends along the first axis, said tubular housing being mounted on and being slidable relative to said slide way along the first axis such that said rear surrounding portion extends rearwardly of said rear end;
• a spindle received in said through hole, and rotatable relative to said inner tubular wall surface, said spindle including a front segment which is adapted to grip a cutting tool and which is disposed proximate to said front surrounding portion, and a rear segment which is opposite to said front segment along the first axis and which extends rearwardly and outwardly of said rear surrounding portion;
• a second mounting frame connected to said rear surrounding portion;
• a drive member mounted on said second mounting frame, and disposed to drive said rear segment of said spindle to rotate about the first axis relative to said inner tubular wall surface;
• a servomotor mounted on said first mounting frame, and having an output shaft extending along a second axis in the axial direction;
• and
• a drive transmission member disposed to convert a rotation force delivered by said output shaft to a translation force which is exerted on said second mounting frame such that said tubular housing together with said second mounting frame is forced to perform linear displacement along the first axis.