Optical measuring instrument

摘要

In order to measure the cutting edge on rotating cutting tools 38, an optical measuring instrument is presented which contains a reflection sensor 110 focused on the cutting edges and a shadow-image sensor 42, which is integrated together with said reflection sensor in a measuring head 40 and forms a shadow light barrier crossing the focal region F of the reflection sensor, as well as an evaluation circuit 124 in which the instantaneous value, which is decisive for determining the cutting edge diameter, of the shadow-image sensor signal is determined in a fixed correlation with a prescribed change in measurement signal of the reflection sensor 110, which change indicates the passage of the cutting edge. <IMAGE>