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本文讨论一种点画线绘制器,包括外壳、安装于外壳底部的滚轮Ⅰ、位于外壳内的运铅装置、与运铅装置相接的滚轮Ⅱ。外壳通过弹簧压住运铅装置,运铅装置侧面设有劈尖,劈尖上方设有转轴。滚轮Ⅱ外缘与转轴相接,滚轮Ⅱ侧面设有与劈尖相切的顶盘,顶盘外缘均匀设有凸起。将点画线绘制器放在纸上,推动该装置前行,滚轮Ⅱ开始滚动,铅笔芯开始画线。当滚轮Ⅱ顶盘的凸起与劈尖相接时,铅笔芯离开纸面,停止画线。随着滚轮Ⅱ转动,运铅装置在竖直方向上做往复运动,铅笔芯间歇式地与纸面接触,从而形成虚线或点画线。
This article discusses a dotted line drawer, which includes a housing, a roller I mounted on the bottom of the housing, a lead transport device in the housing and a roller II connected to the lead transport device. The shell is pressed by the spring to press the lead-transporting device, the side of the lead-transporting device is provided with a wedge tip, and the top of the wedge is provided with a rotating shaft. The outer edge of the roller II is connected with the rotating shaft. The side of the roller II is provided with a top plate which is tangent to the wedge. The outer rim of the top plate is uniformly provided with a protrusion. Put the dotted line drawer on the paper, push the device forward, the scroll wheel II starts to roll, and the pencil lead starts to draw lines. When the top of the roller II disc bump and the tip of the phase, the pencil core leaves the paper, stop drawing lines. As the wheel II rotates, the lead-transporting device reciprocates in the vertical direction, and the pencil lead intermittently contacts with the paper surface to form a dotted line or a dotted line.