SPINDLE-ORIENTED STOP MECHANISM FOR MACHINE TOOL

摘要

A stop mechanism for stopping the spindle of a machine tool in a preselected position. The drive mechanism for the spindle is deenergized by a signal from a tape-operated controller and the inertia of the drive system is permitted to drive the spindle till the energy of the system is dissipated. A second signal from the controller operates a system of electromagnetic clutches and gear trains to slowly drive the spindle till a sensing device feels a selected position of the spindle. The device then deenergizes the slow drive and the inertia of the system moves the spindle toward the selected position. A stop mechanism is operated to stop the slowly coasting mechanism and to lock the spindle in the selected position. In the event the spindle does not reach the selected position, the slow drive is again energized and the process of driving and coasting repeated till the position is secured.