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上班、下班、上课、下课都要按时响铃。一般由专人按铃,比较费事。这里我们介绍一种使响铃自动化的简易方法。方法是在时钟(如“三五”牌)上装一套机构。通过这套机构,时钟就可以按时接通电铃,实现自动报时了。这套机构是由木质圆筒、木质弓、铜触针、滑杆等部件构成的(图1)。木质圆筒:用长50毫米,直径25毫米的轻木材,制成壁厚2毫米的圆筒。在圆筒的首端,装上一块厚约1.5毫米的圆形木片作成的挡板。木片中心钻一孔,孔的大小刚好套在时钟分针轴上。在圆筒末端截面上,钉一块铜片(图2)。
Work, work, class, and class must ring on time. Generally speaking, a bell is called by a person and it is more troublesome. Here we introduce an easy way to automate the ring. The method is to put a set of institutions on the clock (such as “35” cards). Through this set of institutions, the clock can be connected to the bell on time to achieve automatic timekeeping. This set of bodies consists of wooden cylinders, wooden bows, copper stylus, sliders and other components (Figure 1). Wooden cylinder: A cylinder with a wall thickness of 2 mm is made of light wood with a length of 50 mm and a diameter of 25 mm. At the beginning of the cylinder, a bezel of round wood chips about 1.5 mm thick was installed. A hole is drilled in the center of the wood chip, and the size of the hole is just set on the clock minute hand shaft. At the end of the cylinder, a piece of copper is nailed (Figure 2).