光干渉法のねじのよろめき測定への応用

抄録

A rapid, interferometric method for measuring the drunkenness of thread on a lead screw that involves no mechanical contact with the thread is described. The moving plane mirror of a Michelson interferometer is set on the axis of the lead screw. The lead screw is mounted on the carriage of a machine which moves it parallel to its axis. Fringes produced through the Michelson interferometer are changed into a train of electric pulses. These pulses drive a pulse motor which rotates the lead screw such as to move it in the opposite direction to the carriage movement, through a suitable reduction gear train. The movement of thread images is sensed by photoelectric microscopes with a deflecting glass plane and the lead errors and drunkenness are recorded by an associated electric circuit. The performance of the apparatus is persented.