Position control arrangement, especially for a surveying instrument, and a surveying instrument
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United States of America Patent
Stats
-
Jul 27, 2010
Grant Date -
May 28, 2009
app pub date -
Nov 10, 2008
filing date -
Sep 20, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In a position control arrangement for controlling the rotational position of a movable unit, especially for a surveying instrument, an electric motor is arranged to rotate the movable unit around an axis of rotation, and there are controllers for enabling the motor to stop the movable unit in a desired rotational position. The motor is a direct drive motor, the shaft of which forms the axis of rotation for the movable unit, and the motor is arranged to selectively operate in either a first, normal mode for rotating the movable unit to a desired position, or in a second, friction mode for providing resistance to a forced rotation of the movable unit from a predetermined position to a new position. A control unit detects the presence of a forced rotation and automatically changes the mode of operation in response thereto.
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Cited Art Landscape
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