Patent ID: 7793575

Claim:
A power tool comprising: a base portion for supporting a workpiece; a holder supported on the base portion; a cutter mechanism supported above the holder to be swingable up and down with respect to an upper surface of the base portion and including a cutting blade shaft and a cutting blade; and a laser generator unit attached to one of the holder and the cutter mechanism to form a laser light plane substantially in parallel with a surface of the cutting blade; wherein said laser generator unit comprises: a laser generator that irradiates laser light onto the workpiece; a support member for supporting the laser generator, the support member having a first side wall and a second side wall spaced by a first distance and a guide member extending in a direction substantially parallel with an axis of the cutting blade shaft; a resilient member that exerts a biasing force to the laser generator in a direction substantially perpendicular to the axis of the cutting blade shaft so that the laser generator is in contact with the guide member; a screw member extending through the first side wall in a direction substantially parallel with the axis of the cutting blade shaft of the cutter mechanism and screwingly engaged with the laser generator, the screw member being rotatable about an axis thereof without changing an axial position thereof with respect to the first side wall; and a spring disposed around the screw member and provided between the first side wall and the laser generator for maintaining an axial position of the laser generator with respect to the support member, wherein when the screw member is rotated, the laser generator is movable between the first side wall and the second side wall in contact with the guide member so that the laser light plane is maintained substantially in parallel with the surface of the cutting blade.