Measuring system for measurement on tools in a machine tool

A contactlessly measuring system having a measuring measuring device comprising:

• a light transmitter portion and a light receiver portion to determine a position of a tool or to determine a longest cutting edge of a rotating tool in a tool machine,
• wherein a light barrier system is formed by the light transmitter portion and the light receiver portion, the light transmitter portion and the light receive portion each being associated with a leg of an essentially U-shaped support structure of the measuring device, the light barrier system having:
• a fluid blowing device, associated with the measuring device, for cleaning a tool to be measured, and/or
• a sealing air feed in an area of a measuring beam of the measuring device designed as a light barrier measuring system, and/or
• a protective/closing device at the light transmitter portion and/or the light receiver portion of the measuring device designed as a light barrier measuring device,
• wherein the protective/closing device includes a displaceable closure piston and is detachably connected to the light barrier measuring device,
• wherein the displaceable closure piston is arranged in an attachment disposed at the light transmitter portion and an attachment disposed at the light receiver portion and includes a light beam through opening, and
• wherein each attachment has a wall which in a mounted state of each attachment at the light barrier measuring system is closer to a free, upper end of the corresponding leg of the U-shaped support structure than to a lower end of the corresponding leg of the U-shaped support structure, and
• wherein the wall is sloped with respect to a light beam from the light transmitter portion to the light receiver portion such that each attachment to the opposite leg of the U-shaped support structure is tapered.