目前,各校使用的电磁打点计时器,都是采用螺钉尖打点、复写纸记录、打点位置居于纸带中线的结构,使用时存在一些不足之处.对此我作了点滴改进,收到较好效果. 取下振动片,去掉打点螺钉,在距螺钉孔3～4毫米处钻一直径5～6毫米通孔,上下扩出埋头孔,用黄铜(以免日久生锈)将此孔铆死封闭,然后于此铜铆钉中心钻一直径1.8毫米通孔,最后用2毫米丝攻攻出 At present, the electromagnetic timers used in schools are all equipped with screw tips, carbon paper records, and the positions of the dots in the midline of the paper tape. There are some shortcomings in using the timers. I made some improvements and received better Effect. Remove the vibrating plate, remove the RBI screw, drill a hole diameter of 5 to 6 mm at a distance of 3 to 4 mm from the screw hole, expand the countersunk hole up and down, with brass (to avoid rusting in the course of time) Dead closed, and then drilled a diameter of 1.8 mm through the center of the copper rivet hole, and finally with 2 mm wire attack