北京起重机器厂职工遵照毛主席关于“勤俭建国”的伟大教导,在群众性节电活动中,针对机床设备在每天正常生产中所需辅助工作,如装卸活,磨换刀,量尺寸等,此时电动机均在空转浪费电力。为限制主电机空转,加装了自动停车装置,其原理如图1。当操纵手柄置于中间位置离合器脱开时,带动装在离合器轴上偏心凸轮,在凸轮作用 Workers of Beijing Crane Factory follow Chairman Mao’s great teaching about “diligentness and nation-building”, and in the mass energy-saving activities, the auxiliary work required for daily machine tool equipment in normal production, such as loading and unloading, grinding tool change, and size measurement, etc. At this point, the motors are idling and waste electricity. In order to limit the idling of the main motor, an automatic parking device was installed. The principle is shown in Figure 1. When the joystick is placed in the middle position, the clutch disengages, the eccentric cam mounted on the clutch shaft is driven, and the cam acts