Patent ID: 7895929

Claim:
A blade driving mechanism of a table saw, wherein the table saw comprises a main frame and a saw blade mounted to and driven by the blade driving mechanism, the blade driving mechanism comprising: an electrical motor mounted to the main frame, with the motor being capable of sliding with respect to the main frame substantially linearly in a horizontal direction; a belt driving system transferring the rotation of an output shaft of the motor to the saw blade; a center-distance setting means connected between the motor and the saw blade, for adjustably setting the center-to-center distance between the motor and the saw blade; and a saw-blade height adjusting device being operable to adjust the height of the saw blade and comprising: a transverse shaft being capable of rotating about a horizontal axis; a handwheel fixed to the outer end of the transverse shaft for driving the transverse shaft to rotate; a vertical screw shaft coupled with the transverse shaft by a set of bevel gears and driven by the transverse shaft to rotate about a vertical axis; a nut mounted on and engaged with the screw shaft and being capable of moving vertically along the screw shaft by the rotation of the screw shaft; and a guide connected to the nut and supporting the saw blade, the guide being capable of moving vertically with the nut; wherein the center-distance setting means comprises a motor connecting plate and a blade connecting plate, wherein the motor connecting plate is pivotably mounted onto a shaft sleeve of the motor at one end and is formed with at least two oblong holes at the other end, the end of the blade connecting plate which is proximate to the motor connecting plate is formed with screw holes corresponding to the oblong holes, the other end of the blade connecting plate is pivotably mounted onto a blade supporting member which is fixed to the guide and supports the saw blade, and setting screws inserted through the oblong holes and tightly screwed into the screw holes of the blade connecting plate, so as to fix the motor connecting plate and the blade connecting plate together.