| 摘要 |
A multiple spindle machine wherein the front portion of the spindle carrier is rotatable in two axial antifriction bearings and a radial antifriction bearing. The front axial bearing is adjacent to an abutment of the machine frame and the rear axial bearing is separated from the front axial bearing by a flange of the spindle carrier. The radial bearing surrounds the spindle carrier behind the rear axial bearing and is surrounded by an axially compressible clamping ring which can be biased by one or more cylinder and piston assemblies to bear against the rear axial bearing and to thereby undergo radial expansion. The rear axial bearing causes the flange to press the front axial bearing against the abutment to thus maintain the front portion of the spindle carrier in a predetermined axial position. The radially expanding clamping ring bears against a cylindrical internal surfae of the frame and at least indirectly against the front portion of the spindle carrier so that the latter is accurately centered in the frame. A ring gear on the spindle carrier is engaged by a second gear which serves to rotate the spindle carrier between successive working positions. The ring gear can also be engaged by a gear segment which is movable radially of the spindle carrier by a cylinder and piston assembly and serves to lock the spindle carrier in an accurately determined position while the workpieces which are rotated by the work spindles in the carrier undergo treatment by one or more tools. |
