Cutting saw using elliptical internal gear

The present invention relates to a saw using an elliptical internal gear， wherein the saw using an elliptical internal gear is converted into a linear reciprocating feed force by one-way rotational force of a power source by a pinion gear meshed along a pitch source of an elliptical internal gear， before and after saw blades. The cutting force is output at a constant speed， and the sawing operation is performed stably， and in particular， the planetary gear assembly 10 and the internal gear assembly ( 20)， including a straight rod portion 30 is made of the main configuration.