| 摘要 |
A measuring instrument having a flexible steel measuring scale mounted inside a flanged groove defined by a tubular housing includes a scanning unit, guided along the interior of the housing to scan the scale, and a magnet, mounted on the scanning unit. The magnet acts to pull the steel scale towards the scanning unit, into contact with the flanges of the groove. The spacing between the scanning unit and the flanges is precisely controlled and, therefore, the magnet provides precise control over the spacing between the scale and the scanning unit.
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