Adjustable photoelectric detector head for solid state limit switch
First Claim
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1. A photoelectric detector head for a solid state limit switch, said detector head comprising, in combination:
- a housing having a window in one side thereof;
photoelectric detector means within said housing comprising a photoreceiver and a light source;
said photoreceiver being fixedly mounted within said housing and having a field of view directed through said window;
said light source being pivotally mounted within said housing and directed to emit a light beam through said window to intersect said field of view outside said housing; and
adjustment means operable to pivot said light source to change the angle of convergence of said light beam with said field of view of said photoreceiver to thereby vary the distance from said housing at which said light beam intersects said field of view;
said light source comprises a cradle journaled for rotation in said housing and a light emitting device fixedly mounted to said cradle;
an indicator projecting from said cradle toward a side of said housing and providing an indication of the distance from said housing at which said light beam intersects said field of view;
window means in said housing in which said indicator may be viewed; and
indicia on said housing adjacent said window means;
said indicator means and said indicia cooperatively providing an indication of the distance from the housing at which said light beam intersects said field of view; and
whereinsaid adjustment means comprises a screw threadably received in said housing and having a portion in cooperating engagement with said cradle to pivotably move said cradle.
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Abstract
A diffuse reflective photoelectric detector head (2) for a solid state limit switch (4) having a photoreceiver with a fixed field of view (FV) and a light source (20) pivotally adjustable to cause its light beam (LB) to intersect the field of view (FV) at varying distances from the detector head, the adjustment being indicated by a mechanical indicator (26f). The head is mountable on a limit switch enclosure (8) in any of four major axis positions, with electrical connections (22a-50a, b, c) for the head being made at the junction of head (2) and enclosure (8).
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Citations
12 Claims
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1. A photoelectric detector head for a solid state limit switch, said detector head comprising, in combination:
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a housing having a window in one side thereof; photoelectric detector means within said housing comprising a photoreceiver and a light source; said photoreceiver being fixedly mounted within said housing and having a field of view directed through said window; said light source being pivotally mounted within said housing and directed to emit a light beam through said window to intersect said field of view outside said housing; and adjustment means operable to pivot said light source to change the angle of convergence of said light beam with said field of view of said photoreceiver to thereby vary the distance from said housing at which said light beam intersects said field of view; said light source comprises a cradle journaled for rotation in said housing and a light emitting device fixedly mounted to said cradle; an indicator projecting from said cradle toward a side of said housing and providing an indication of the distance from said housing at which said light beam intersects said field of view; window means in said housing in which said indicator may be viewed; and indicia on said housing adjacent said window means; said indicator means and said indicia cooperatively providing an indication of the distance from the housing at which said light beam intersects said field of view; and
whereinsaid adjustment means comprises a screw threadably received in said housing and having a portion in cooperating engagement with said cradle to pivotably move said cradle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification