PURPOSE: To enable a curve to be drawn easily by a simple operation by installing a driven gear molting metal on a lateral lever and further, mounting a pen attaching metal on a drive lever which rotates by rotation of a driven gear shaft, at an installation position which is freely adjusted.

CONSTITUTION: A main drive gear 17 is set to engage with one of racks 9 and a driven gear 22 is set to engage width the main drive gear 17. Next, both lower lever 30 and upper lever 25 are fixed after selecting between distances between the lower lever 30 and the upper lever 25, and a pen 35 is lowered to the surface of a sheet. If a handle 7 is turned, a vertical lever 14 moves laterally and at the same time, the main drive gear 17 which is engaged with rack 9 rotates, and the driven gear 22 rotates in a reverse direction to the main drive gear 17 and at a different rotating speed from the par 17. As the driven gear 22 allows a driven gear shaft 23 in the same direction and at the same rotating speed, a drive lever 28 is caused to rotate through an upper connecting shaft 26 and the upper lever 25. Subsequently, a pen attaching metal 33 also rotates through the lower lever 30 connected to the drive lever 28 to draw a curve. Thus it is possible to draw a variety of curves easily.