Patent ID: 6921235

Claim:
A laser centering mechanism of a drilling machine, comprising a clamp ring fitted around a drill chunk of a drilling machine; the clamp ring having a through hole, a plurality of spaced upper flexible plates sticking upwards, and a plurality of spaced lower flexible plates sticking downwards; each of the upper flexible plates tapering towards an upper end thereof to have a sloping surface on an outer side thereof; each of the lower flexible plates tapering towards a lower end thereof to have a sloping surface on an outer side thereof; an upper knob having a central through hole, and fitted around an upper portion of the clamp ring; the upper knob having an annular sloping portion fitting, and pressed against, the sloping surfaces of the upper flexible plates; the upper knob having left-handed screw threads on an inner side thereof; a lower knob having a central through hole, and fitted around a lower portion of the clamp ring; the lower knob having an annular sloping portion fitting, and pressed against, the sloping surfaces of the lower flexible plates; the lower knob having left-handed screw threads on an inner side thereof; the upper and the lower knobs being securely screwed to each other so that the annular sloping portions thereof make corresponding flexible plates pressed against the drill chunk to fit the clamp ring around the drill chunk securely; first and second laser modules fixedly disposed adjacent to an inner edge of the lower knob; the laser modules being equipped with such lenses that laser lights emitted therefrom form respective straight light lines on a plane under them; the straight light lines intersecting each other right on a central axis of the drill chunk, and having a light point left visible at the intersection thereof in rotation of the lower knob together with the drill chunk owing to persistence of vision.