Supporting plate structure for magnetoscale
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United States of America Patent
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Jul 22, 2014
Grant Date -
Feb 23, 2012
app pub date -
Feb 23, 2010
filing date -
Apr 24, 2009
priority date (Note) -
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Abstract
The invention provides a supporting plate structure for a magnet grid ruler, including a plurality of pieces of supporting plates and at least two sections of ruler shells within which magnetic strips are provided, both ends of each section of the ruler shells are fixedly mounted on two pieces of the supporting plates respectively, and the respective pieces of supporting plates are mounted at one side of a machine guide rail pair. A magnet grid reading head is mounted at the other side of the machine guide rail pair, and is moved with respect to magnetic strips. In the invention, the supporting plate structure is designed to be a structure with a plurality of pieces, each has a smaller size, thus the supporting plates do not need to be calibrated exactly, and thus time and work are saved. Also, the supporting plates have no twisting and bending, so as to ensure the straightness of the ruler shells and magnetic strips, which are mounted on the supporting plates, thereby improving parallelism between the magnetic strips and the magnetic grid reading head and improving the measurement accuracy of the magnetic grid.
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