Patent ID: 6502058
Filing Date: 2002-12-31
Classification: B41J

Abstract:
A thickness measuring device comprising:a substrate; a stepping motor supported on said substrate and having a rotor shaft forwardly and reversely rotatable about said rotor shaft; a translating mechanism for translating rotations of said rotor shaft into a linear movement; a pressing block formed with a projection, said pressing block being coupled to said rotor shaft through said translating mechanism for moving said projection toward and away from an object to be measured supported on a supporting plate in accordance with forward and reverse rotations of said stepping motor; a control unit for controlling a pulse rate of said stepping motor, said pulse rate controlling a pressing force applied by said pressing block, to move said projection from a predetermined fixed position to the object and then to backwardly move said projection from the object to the predetermined fixed position, and for computing a thickness of the object based on an actual amount of rotations of said stepping motor detected when said projection is moved a one-way distance between the predetermined fixed position and the object, wherein said controllable pulse rate is used to free said computed thickness from the influence of resilient deformation of said supporting plate.