Patent ID: 6260286
Filing Date: 2001-07-17
Classification: G01B

Abstract:
A micrometer comprising:a main body having an anvil at one end thereof;a spindle having a screwed portion engaging an opposite end of said main body and being displaceable in an axial direction and with respect to said anvil in conjunction with rotation of said spindle;a thimble provided on the opposite end of said main body, said thimble being rotatable about the axis of said spindle at a predetermined position in the axial direction of said spindle; andan encoder detecting an axial displacement amount of said spindle from a rotation amount of said spindle, so that a measurement value based on an output signal of said encoder is digitally displayed,wherein said thimble is formed with a guide groove parallel with the axial direction of said spindle in an inner peripheral surface thereof, andsaid spindle includes an engagement portion located in said spindle and slidably engaging with said guide groove of said thimble.