An electric pencil sharpener USES a toy motor as power and is composed of conic casing with tubular ends, multi-edge cutter for wooden part and a small abrasive wheel for lead core.

一种电动卷笔器，玩具电动机经齿轮减速装置与一中部为锥形，两端为空心圆筒的多刀刃卷笔刀筒机械连接。小砂轮套装在玩具电动机轴上。

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An edge cutter (3) is arranged on the seat frame (4) of the air extruding roller. The constant cutting distance improves and ensures the quality of a cutting edge after the rolls are combined.

切边刀(3)安装在挤气滚筒座架(4)上，恒定的切刀距离，提高和保证了合卷后切边的质量。

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This paper analyses the geometrical character of curve of edge of form milling cutter, and infers the mathematical equations of curve, The center coordinates of conical button-shaped are evaluated.

本文分析了成型铣刀刀刃曲线的几何性质，推导出它的数学方程，求取铣刀上圆盘刀片中心坐标，为成型铣刀的计算机辅助设计奠定了理论基础。

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