Laser alignment device of a circular saw

A laser alignment device of a circular saw, comprising a rotary disk base, a protective cover, and a magnetic ring base, wherein:

• the rotary disk base is provided with a hollow lug protruded outward therefrom, the hollow lug has a shaft hole for passage of a drive shaft of the circular saw, multiple silicon steel plates are secured on the hollow lug, an armature coil is mounted around the hollow lug between the silicon steel plates, the rotary disk base is provided with a laser generator, the rotary disk base is formed with a light permeable hole aligned with the laser generator, the light permeable hole of the rotary disk base is in parallel with and close to a circular saw blade of the circular saw, so that a laser light emitted from the laser generator can be projected on a predetermined cutting position of the circular saw blade exactly;
• the protective cover is screwed on one side of the rotary disk base to cover and fix the rotary disk base, thereby providing a dustproof and positioning effect;
• the magnetic ring base is secured to a gear box of an end side of a motor of the circular saw, and is provided with a stator member of a magnetic ring, the stator member of the magnetic ring of the magnetic ring base is mounted around a periphery of a rotor member of the silicon steel plates of the rotary disk base, thereby forming a rotation generator mechanism between the rotor member and the stator member of the magnetic ring;
• and
• the circular saw blade and a housing can be serially mounted on the other side of the rotary disk base, the drive shaft of the circular saw can be in turn extended through the circular saw blade and the housing, and can be screwed with a bolt, thereby mounting the circular saw blade and the housing on the drive shaft of the circular saw integrally.