Patent ID: 7249545
Filing Date: 2007-07-31
Classification: B23Q,Y10T

Abstract:
1. A numerically controlled lathe comprising: first and second main shafts which are disposed opposite to each other and which are movable with respect to each other; first and second tool posts to which a plurality of tools are attached so as to machine works held by the first and second main shafts; and a control device which controls movements of the first and second main shafts and the first and second tool posts, wherein the first tool post is arranged integrally with the second main shaft, and is movable in a main shaft axial direction of the second main shaft and in an axial direction crossing at right angles to the main shaft axial direction in a plane, the second tool post is movable in a biaxial direction which is the same direction as that of the movement of the first tool post, and an axial direction crossing at right angles to the biaxial direction so that the second tool post moves in three directions, and when the work attached to the first main shaft is machined by the tool attached to the first tool post and the work attached to the second main shat is machined by the tool attached to the second tool post simultaneously, the control device superposes the uniaxial or biaxial movement required for the first tool post to machine the work on the uniaxial or biaxial movement required for the second tool post to machine the work, and outputs an instruction for movement to the first or second tool post, so that the machining operation of the work by the tool attached to the first tool post and that of the work by the tool attached to the second tool post are simultaneously effected.