| 摘要 |
<p>A headstock for machines or automatic lathes comprises a housing (1) with a hollow main spindle (2), whereby an electric motor and/or a pulley (3) for an electrically powered belt drive is/are mounted on said main spindle. A hollow pull-push rod (5) is arranged in the main spindle for the control of the jaws (7a, 7b) of a collet chuck or a draw-in chuck (7) mounted on the front end (2a) of said main spindle. This pulley or electric motor is mounted at the read end (2b) of the main spindle. A clamping cylinder (13) built of two or more members (10, 11, 12) is mounted on the pulley (3) and/or the rearward surface (9 and 2c, respectively) of the main spindle (2), said clamping cylinder rotating together with said pulley (3) and/or said main spindle (2). As a result, a fast engaging and disengaging is allowed of a rod-shaped material passing through the hollow main spindle by means of the collet chuck or the draw-in chuck while said main spindle rotates at speeds exceeding 6,000 rpm, and without the rotating members running hot and without reducing the processing accuracy of the machine.</p> |
