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| Wrapper assembly including an article carrier element |
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| Measuring instrument for the optical focal spot |
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| Tube coupling for vacuum cleaners |
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| Insulated drill collar gap sub assembly for a toroidal coupled telemetry system |
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| Microwave frequency discriminator comprising an FET amplifier |
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Electro-optical presence detection scanner
| Details |
Inventors: Stratton, Richard L.;
Assignee: Dyna-Tech Corp. (Portland, OR)
Primary Examiner: Nelms; David C.
Assistant Examiner:
Attorney, Agent or Firm: Kolisch, Hartwell & Dickinson
A system for viewing a zone to detect the presence of an article carried therein on a conveyor. In one embodiment, the system includes a laser source which projects a line-beam of coherent light toward the zone, which beam is intersected, along a length thereof, by the planar field of view of a reflection detector whose view-plane contains the beam. In another embodiment, the system uses a laser source which projects a planar beam of coherent light which is intersected by the field of view of a reflection detector whose view-field has both length and breadth dimensions where it intersects the laser beam. In both embodiments, the region of intersection of the laser beam and the detector's field of view is spaced from the conveyor. |
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DETAILED DESCRIPTION OF THE INVENTION Turning now to the drawings, and referring first to FIGS.
1 and 2, indicated generally at 10 is a positioning station, or zone, in a sawmill where logs are to be positioned prior to their being fed endwise into a saw.
Provided for carrying logs endo into this station, and ultimately into a saw, is a movable carriage 12.
A log 14 is shown on the carriage in the station.
Provided on one side of the carriage is a laterally shiftable positioner including upright independently movable arms 16 which may be shifted toward and away from the carriage for the purpose of aligning a log thereon as desired.
Shown schematically at 18 in FIG.
1, as being associated with the positioner arm seen in this figure, is a rack and pinion drive which is driven by an electric motor 20.
A like drive and motor are provided for the other arm.
The motors are started and stopped through suitable conventional control apparatus, such as that represented in block form at 22.
What has been described so far is entirely conventional.
What is intended with this apparatus is that logs, such as log 14, are brought into station 10 on carriage 12 so that they may be engaged by arms 16 of the positioner.
Prior to feeding such logs endwise into a saw, it is desired that each log be positioned laterally on the carriage, whereby its side which is opposite arms 16, extends no further than a selected plane, such as that shown represented by line 24 in FIG.
1.
When a log is so positioned, it is in proper lateral alignment for feeding into the mentioned saw.
Provided according to the present invention for assisting in so positioning logs is a monitoring system including a pair of modulated laser sources 26, 27 and a pair of reflection detectors 28, 29 which are sensitive to the beams emitted by the sources.
Sources 26 and detector 28 are associated with the right-hand arm 16 in FIG.
2, and source 27 and detector 29 are associated with the left-hand arm in this figure.
The two sources are identical
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Image Analysis 
