Saw blade elevating device for table saw

A saw blade elevating device for use with a table saw, the saw blade elevating device comprising:

• a mounting base;
• a rotating base pivotally mounted with the mounting base and having two opposite guide slots each extending inclinedly downward and having an upper dead point and a lower dead point;
• a saw blade unit pivotally mounted with the mounting base and fastened to the rotating base;
• and
• a driving unit having a lead screw rotatably inserted in the mounting base, and a guide rod screwed to the lead screw and provided with two ends respectively inserted in the guide slots of the rotating base such that the guide rod can be driven by the rotation of the lead screw to be moveable between the upper and lower dead points of the guide slots of the rotating base for causing a pivotal movement of the rotating base relative to the mounting base to lift or lower the saw blade unit relative to the mounting base.