Patent ID: 6430823
Filing Date: 2002-08-13
Classification: G01C

Abstract:
A datum plane setting device comprising:a motor, rotary bodies which rotate in accordance with rotary driving of said motor, rotary head portions formed on the tip end portions of said rotary bodies, laser emitting portions which are accommodated inside said rotary head portions and rotate with said rotary heads as one body, a power source portion which supplies current for the motor and laser emitting portions, a casing which accommodates at least the motor, rotary bodies, the power source portion, supporting members of said casing horizontally supporting thereof, and a level confirming a horizontal level of said casing, wherein the laser emitting portions are composed so that current is supplied from the power source portion via current-supplying brushes which contact guiding paths provided to surround the rotary bodies, wherein said rotary bodies include a first rotary body fixed to a rotary axis of the motor and at least one or more second rotary bodies which rotate with the first rotary body simultaneously via a belt which is wound around a pulley formed on the rotary axis portion.