Mitutoyo Corporation

Yuuzou Hashimoto

Osamu Saito

Shuuji Hayashida

Yuichi Ichikawa

Takahiro Nakamura

Nobuyuki Hayashi

Kouji Sasaki

Seigo Takahashi

Masamichi Suzuki

Yuji Fujikawa

Masahiko Tachikake

Tetsuya Nakadoi

Tomio Omori

Masafumi Okamoto

A measuring instrument that includes a tubehaving a female threadand a spindlehaving a lead screwscrewing with the female threadand capable of being advanced and retracted in an axial direction along with rotation around the axial center, and measures dimensions etc. of a workpiece according to displacement in an axial direction of the spindlebased on a rotation amount of the spindleAccording to this measuring instrument, a pitch P of the lead screwis twice as large or more than the difference between an external diameter R and a core diameter r thereof, and the difference between the external diameter R and the core diameter r is one-fifth or less of the external diameter R. Because of the lead screwwith the large pitch, the spindlecan be moved at high speed, thus enhancing operational performance of the measuring instrument.

Measuring instrument

Provided is a measuring devicefor measuring the size of an object comprising a body, and a spindlewhich is screwed into the bodyand axially advances and retracts by screwing with respect to the body, the measurement being based on the axial displacement of the spindleeffected by the revolution of the spindle, wherein the spindle is screwed into the bodyvia a multiple-start thread. Therefore, it is possible to displace the spindleat a high speed, which improves the operability of the measuring device.

Measuring device using multi-start threaded spindle

Growing community of inventors

Kure, Japan

Yuuzou Hashimoto