Patent ID: 7441994
Filing Date: 2008-10-28
Classification: B23C,B23Q,Y10T

Abstract:
1. A machine tool comprising: a machine frame including a base seat, and a hollow upright mounting frame disposed fixedly on said base seat; a worktable device including a spindle unit including an upper vertical threaded rod journalled on said upright mounting frame of said machine frame, an upper driving unit operable to rotate said upper vertical threaded rod, a spindle seat connected to said upper vertical threaded rod such that rotation of said upper vertical threaded rod results in vertical movement of said spindle seat, a main spindle journalled on said spindle seat, and a motor for rotating said main spindle; and a balancing unit including an upright guiding rod disposed fixedly in said upright mounting frame of said machine frame, a counterweight block sleeved movably on said guiding rod, a guiding wheel assembly disposed on a top end portion of said upright mounting frame, and a driving belt extending around said guiding wheel assembly and having two ends fastened respectively to said spindle seat and said counterweight block.