An electric pencil sharpener USES a toy motor as power and is composed of conic casing with tubular ends, multi-edgecutter for wooden part and a small abrasive wheel for lead core.
An edgecutter (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。
3
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.