Precision distance-measuring instrument

A precision distance measuring instrument comprising:

• a housing defining a measuring axis,
• a measuring spindle disposed rotatably and shiftably in the housing in such a manner that a certain rotary motion of the measuring spindle results in a corresponding shift of the measuring spindle along the measuring axis,
• a sensor device for detecting the rotary motion of the measuring spindle;
• the sensor device has a stationary sensor element which is stationary relative to the housing and a movable sensor element which is connected to the measuring spindle to rotate therewith and which is shiftable relative to the measuring spindle along the measuring axis;
• between the stationary sensor element and the movable sensor element a clearance of predetermined width is set,
• a guiding device for guiding the relative shifting motion between the movable sensor element and the measuring spindle, and
• a setting device for variable setting the width of the clearance between the stationary sensor element and the movable sensor element.
• wherein the sensor elements are supported on bearing sleeves having annular axial bearing extensions which have essentially identical outer diameters and which extend toward one another in the axial direction and contact one another with their end faces.

A precision distance measuring instrument comprising:

• a housing defining a measuring axis,
• a measuring spindle disposed rotatably and shiftablv in the housing in such a manner that a certain rotary motion of the measuring spindle results in a corresponding shift of the measuring spindle along the measuring axis,
• a sensor device for detecting the rotary motion of the measuring spindle;
• the sensor device has a stationary sensor element which is stationary relative to the housing and a movable sensor element which is connected to the measuring spindle to rotate therewith and which is shiftable relative to the measuring spindle along the measuring axis;
• between the stationary sensor element and the movable sensor element a clearance of predetermined width is set,
• a guiding device for guiding the relative shifting motion between the movable sensor element and the measuring spindle, and
• a setting device for variably setting the width of the clearance between the stationary sensor element and the movable sensor element,
• wherein the guiding device comprises a guiding sleeve connected to the movable sensor element for rotation therewith;
• the guiding sleeve has an inner groove which extends parallel to the measuring axis and a guiding member which is connected to the measuring spindle for rotation therewith and which projects shiftably into the inner groove.