Mitutoyo Corporation

Tetsuya Nakadoi

Masahiko Tachikake

Shuuji Hayashida

Osamu Saito

Kouji Sasaki

Seigo Takahashi

Rie Tanaka

Masamichi Suzuki

Shingo Nishina

Yoshiaki Shiraishi

Yuichi Ichikawa

Takahiro Nakamura

Yuuzou Hashimoto

Yoshitaka Kuji

Akio Fujimaru

Masafumi Okamoto

Takahiro Otsuka

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

A measuring instrument includes a spindle ( ) provided to a body ( ), a sleeve ( ) movable in the same direction as the spindle and stoppable at a desired position, a connector ( ) for connecting the sleeve and the spindle and allowing relative movement of the sleeve and the spindle in the moving direction thereof by a predetermined stroke; a pressure spring ( ) accommodated in the sleeve for biasing the spindle in a direction for the spindle to abut to the workpiece through the connector, and a biasing force indicator ( ) for indicating the pressure spring.

Measuring instruments

A minimum value renewal holder (,) for renewing and displaying a detected value (D) detected by a displacement sensor (,) on a display (,) when a spindle is moving in an advancing direction relative to an anvil and for holding a displayed value on the display (,) when the spindle moves in a retracting direction relative to the anvil and a retraction amount thereof (D&minus;Dm) is less than a set amount (&agr;), and a minimum value hold releasing potion (,) for releasing minimum value hold status when the spindle moves in the retracting direction relative to the anvil and the retraction amount (D&minus;Dm) is not less than the set amount (&agr;) are provided. Accordingly, the displayed value can be kept even when the anvil backs unpreparedly.

Micrometer that holds displayed displacement when retraction amount is less than a set amount

A linear displacement measuring apparatus in which a spindle is disposed movably forwardly and backwardly to a measuring apparatus main body, a detector for detecting a linear displacing amount of the spindle is disposed to the inside of the measuring apparatus main body and a water-proof mechanism is disposed to a liquid intruding path in communication with the detector for preventing liquid from intruding.

Linear displacement measuring apparatus

Growing community of inventors

Higashihiroshima, Japan

Tetsuya Nakadoi