Patent ID: 8272616

Claim:
A rotation mechanism for mounting and rotatably supporting a laser emitter thereon, said rotary mechanism comprising: a casing including a bottom wall and a side wall connected to the bottom wall, said casing defining therein a receiving space; and a plurality of rotation rings that are arranged layered with each other in the receiving space of the casing; said plurality of rotation rings comprising: an uppermost rotation ring in the form of a manual coarse rotation ring that is directly connected to the laser emitter so as to support the laser emitter, the manual coarse rotation ring operable to manually rotating the laser emitter to achieve a coarse angular positioning thereof; an automatic coarse rotation ring operable to rotate the laser emitter at a relatively high speed together with another of the plurality of rotation rings which is layered immediately above the automatic coarse rotation ring, the automatic coarse rotation ring having a first driving means arranged on another of the plurality of rotation rings which is layered immediately below the automatic coarse rotation ring; a manual fine rotation ring operable to slightly rotate the laser emitter manually together with another of the plurality of rotation rings which is layered immediately above the manual fine rotation ring; and an automatic fine rotation ring for rotating the laser emitter at a relatively low speed, together with another of the plurality of rotation rings which is layered immediately above the automatic fine rotation ring, the automatic fine rotation ring having a second driving means arranged on another of the plurality of rotation rings which is layered immediately below the automatic fine rotation ring; wherein the manual coarse rotation ring, the automatic coarse rotation ring, the manual fine rotation ring, and the automatic fine rotation ring are coaxially disposed in the receiving space defined by the casing.