Mitutoyo Corporation

Takahiro Nakamura

Osamu Saito

Shuuji Hayashida

Yuichi Ichikawa

Yuji Fujikawa

Yuuzou Hashimoto

Nobuyuki Hayashi

Kouji Sasaki

Seigo Takahashi

Masamichi Suzuki

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

A stator () is hooked in a frame body () away with a prespecified space from a spindle (), so that it is not necessary to fix the stator with a screw. The stator (), therefore, can easily be mounted, and further as it is not necessary to provide a screw hole in the frame body (), so that the need for waterproofing processing associated with a screw hole is eliminated. Further the stator () is hooked in a protrusion () of an electronic unit () inside the frame body () away with a prespecified space from the spindle (), so that a rotation thereof in the peripheral direction of the spindle due to play and rattle is small and a measurement error can be suppressed.

Digital displacement 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

Higashihiroshima, Japan

Takahiro Nakamura