Mitutoyo Corporation

Futoshi Doi

Nobuyoshi Fujii

Satoshi Ueda

Shigeru Ohtani

Yu Sugai

Shigemitsu Aoki

Tatsuki Nakayama

Toshihiko Kajihara

Machine for measuring surface shape and surface roughness

In a surface texture measuring instrument, a measurement arm includes: a first measurement arm that is supported by a bracket around a support shaft movably in a circular movement in a casing; and a second measurement arm having styluses that are attachably and detachably provided to an end of the first measurement arm via an attachment-detachment mechanism, the attachment-detachment mechanism being arranged in the casing. A displacement detector includes: a scale provided to the measurement arm; and a detection head provided to the bracket to face the scale. A detecting surface of the scale is on an axis of the measurement arm and on a plane of the circular movement of the measurement arm.

Surface texture measuring instrument

A surface texture measuring instrument has a pre-load leaf spring ( ) for biasing a detector ( ) having a skid ( ) at a distal end thereof, a pre-load force controller ( ) for controlling a pre-load force of the pre-load leaf spring ( ), and a stopper ( ) for restricting movement of the detector ( ) in a biasing direction when a predetermined pre-load force is applied to the detector ( ) by the pre-load force controller ( ). In conducting a skidless measurement, the detector ( ) is locked by applying the predetermined pre-load force to the detector ( ) by the pre-load force controller ( ). In conducting a skid measurement, the pre-load force less than the predetermined value is applied to the detector ( ) by the pre-load force controller ( ).

A slider holding a measuring tool moves along an approximately reverse U-shaped guide rail provided in parallel with a moving direction of the measuring tool without being rotated. Accordingly, a cross section of the guide rail can be enlarged without increasing the size of the entirety of a drive unit. As a result, high rigidity can be obtained while reducing the size and weight of the drive unit as compared to a conventional arrangement having two shafts. Further, linearity of the slider and the measuring tool moving along a reference surface of the guide rail can be attained with high accuracy. Further, since a pre-load means for biasing the slider toward a guide rail is provided, a position or orientation of the slider and the measuring tool can be stabilized, thus securely repeating movement of the measuring tool.

Drive unit

Growing community of inventors

Kawasaki, Japan

Futoshi Doi