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| Miniature flashlight |
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Alignment laser with over-flooded aperture system and dual-mode self-centering target
| Details |
Inventors: Hamar, Martin R.;
Assignee: Hamar Laser Instruments, Inc. (Wilton, CT)
Primary Examiner: Turner; Samuel A.
Assistant Examiner:
Attorney, Agent or Firm: Casella; Anthony J., Hespos; Gerald E.
A device for aligning and measuring a hollow, rotatable bore includes a laser beam source within a housing having an aperture in its front face for passing the beam. The housing is mounted at one end of the extruder bore to project the beam through the bore to be detected by a target at the opposite end. The diameters of the aperture and bore are concentric and the laser beam defines an axis that is alignable with the axis of rotation of the rotatable member, using target signals, by vertical and horizontal displacement with micrometers disposed on the rear face of the laser housing. Various arrangements for mounting the housing on the extruder are disclosed. The target includes a sensing cell in a housing mounted in an adapter with four balls disposed on its periphery 90.degree. apart. The housing orients the cell plane coincident with the plane of the four balls and the diameter at the four balls is dimensioned to exceed that of the bore to be measured so that the target member when tilted and inserted into the bore will jam into place at an angle. The four balls can be urged into contact with the inside diameter of the bore, resulting in a target that is self-centered. In another mode, the housing may be moved so that the cell plane is perpendicular to the axis of the bore to permit the diameter of the bore to be checked. |
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DETAILED DESCRIPTION The present invention involves a laser metrology system for properly aligning machine parts and, in a preferred embodiment, for correcting the alignment of a machine member having at least one axial passageway, such as a spindle, a turbine, or an extruder barrel or bore.
Accordingly, a laser source is disposed within a housing, readily mountable at one end of the passageway, and its beam is projected through the passageway for detection by a target disposed in its own housing and mountable at another location in the passageway or in a separate bore adjustably alignable with the passageway.
The laser housing has a front face with an aperture through which the laser beam is directed.
The aperture is smaller than the cross-section of the laser beam, and hence is "over-flooded" by the laser beam.
Additionally the center of the aperture is disposed concentrically with the axis of the passageway.
The laser beam defines an axis that is to be aligned with the axis of the passageway.
Alignment of the laser beam with the axis of the passageway is measured by signals from the target.
Micrometer components accessible through the rear face of the laser housing rotate an optical component within the laser housing for shifting the laser beam horizontally and/or vertically into alignment with the axis of the passageway.
Various structures may be used to mount the laser housing at the passageway, e.
g.
, magnets, or a flange, or a turning, that are disposed to hold the housing arrangement on the end member being aligned.
The target assembly includes a photosensitive cell capable of generating electrical signals indicative of the location at which a laser beam impinges.
The cell may be secured in a target housing which, in turn, may be mounted on an adapter with four balls disposed on its outer periphery 90.
degree.
apart with their centers disposed in a common plane.
The target housing and the adapter may be oriented to position the center of the cell plane in the plane of the four balls and at the center of the diameters connecting opposed balls
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