| 摘要 |
An apparatus for bringing a rotary grinding tool into mesh with a workpiece while minimizing a grinding resistance by the workpiece when the workpiece is to be ground by the rotary grinding tool. An electric power detector is associated with the rotary tool and a sensor is associated with the workpiece. A gate is opened by a peak current detected by the power detector when the workpiece and the grinding tool engage each other and a pulse signal from the sensor, engaging a clutch to connect the workpiece directly to a drive source in response to a signal supplied upon elapse of a prescribed interval of time through a delay circuit. |
