Drawing Compasses for Drawing Circle by Holding and Pushing with One Finger

Abstract

In the present study, a new drawing compasses required for drawing a precise circle with uniform thickness and even application of dark line was developed. The performance of the new drawing compasses was evaluated. In the developed drawing compasses, by holding with one finger, a lead is set up, and a constant writing pressure is put on the lead. By pushing with same one finger, a pushing force is acted to the developed drawing compasses in only one direction, and the circle is drawn. In this paper, a structure, a mechanism and form changes about the developed drawing compasses were shown. An analytical model was generated for analyzing the pushing force and the writing pressure. The drawing compasses was created actually. The validity of the analytical model was checked from a comparison between the created drawing compasses and the analytical model. The circle was drawn actually using the created drawing compasses. From analysis results using the analytical model, effects on drawing the precise circle with uniform thickness and even application of dark line to the plane of the paper using the developed drawing compasses were shown.