Hole center detecting apparatus, straightness measuring...

Geometrical instruments – Gauge – Straightness – flatness – or alignment

Reexamination Certificate

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C033S552000, C156S117000

Reexamination Certificate

active

07013573

ABSTRACT:
A hole center detecting apparatus for positioning the hole of a spool and a cord accurately by determining the coordinates of two points of intersection between the inner circumference of the spool hole and a virtual straight line to compute the coordinates of the center of the hole and by moving the cord according to the computed coordinates of the hole center. A straightness measuring apparatus for measuring the curvature of a cord automatically by detecting the coordinates of three longitudinal points of the cord. A measurement apparatus for measuring a residual torsion automatically by measuring the rotation angle of the end portion of the cord before and after clamped, electrically.

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