Tiltable rotating construction laser with a grade mechanism and method for determining a position of a grade arm of the grade mechanism

摘要

Rotating construction laser device (28) with a grade mechanism (1), comprising a lens barrel (21) in which a laser optical system (20) is disposed; a frame structure (8) that is fixed to, integrated into or directly provided by a part of the structure of the lens barrel (21); a grade arm (2), which is tiltably supported on the frame structure (8) in an XZ-plane; a tilt sensor (10) which is provided at the grade arm (2) and is configured to detect a level position of the grade arm (2); a tilting mechanism (22), which is provided on the frame structure (8) and is designed to tilt the grade arm (2) relative to the XZ-plane; a position detection device for detecting a feedback position information; and a levelling mechanism (23), which supports the lens barrel (21) tiltably and is designed to tilt the lens barrel (21) in order to have the level position detected by the tilt sensor (10) and therewith to level the grade arm (2), characterised in that the position detection device is configured to detect a feedback position information, which directly depends on the position of a reference point on the grade arm (2), thus allowing to deduce a position of the grade arm (2) directly from the feedback position information, and/or to calculate a tilting angle (β, β1) of the grade arm (2) with respect to the lens barrel (21) directly from the feedback position information.