Patent ID: 7877894

Claim:
A digital displacement measuring instrument, comprising: a body; a spindle screwed into the body to be axially advanced and retracted; and an encoder that detects a displacement of the spindle, wherein the encoder comprises a rotor rotating in a circumferential direction of the spindle and a stator disposed opposite to the rotor with an interposition of a predetermined gap and provided on the body, the rotor is supported by a rotor holder fitted to an outer circumference of the spindle to be displaceable in an axial direction of the spindle, the rotor being disposed opposite to the stator with the interposition of the predetermined gap, the rotor holder includes an engaging key engageable with a key groove axially provided on the outer circumference of the spindle and is displaceable in the axial direction of the spindle by a position adjusting screw, the position adjusting screw covers the outer circumference of the spindle opposite to the stator across the rotor holder and is screwed into the body to be displaceable in the axial direction of the spindle, and the stator is fixed to the body via a stator holder in a vicinity of the spindle so as not to be displaceable in the axial direction of the spindle.