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Position detecting apparatus

  • US 4,238,828 A
  • Filed: 10/06/1978
  • Issued: 12/09/1980
  • Est. Priority Date: 10/07/1977
  • Status: Expired due to Term
First Claim
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1. A tunneling machine having a cutting head adjustably supported by a member extending from said machine, and position detecting apparatus having(a) a target attached to said member in predetermined positional relationship to said cutting head, said target having identifying means for identifying therein at least four target points in non-coplanar relationship with each other;

  • (b) a camera, having a focal plane at which images are formed, arranged to view the target so as to form on said focal plane images of at least three of said target points, said camera being adjustably positionable on a predetermined datum line and being disposed sufficiently close to said target to provide sensibly different angles to the points on said target which are being viewed by said camera; and

    (c) a computer arranged to receive signals indicative of the positions of said images on the focal plane of the camera, and for calculating from said received signals the orientation of the target points corresponding to said images in relation to a given reference plane, and for calculating thereby the position of the said cutting head as projected onto any other plane defined in relation to said given reference plane.

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