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Publication numberUS3854586 A
Publication typeGrant
Publication dateDec 17, 1974
Filing dateMay 15, 1973
Priority dateMay 15, 1973
Also published asCA998645A1, DE2415752A1, DE2415752C2
Publication numberUS 3854586 A, US 3854586A, US-A-3854586, US3854586 A, US3854586A
InventorsPerkins J
Original AssigneeAmf Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Automatic grader for sorting objects according to brightness and color tones
US 3854586 A
Abstract
A system and apparatus for grading and sorting tobacco leaves and other objects according to brightness and two color tones are provided. The tobacco leaves or objects are caused to traverse a background plate of known color and both are impinged by polychromatic light. The light reflected therefrom in three distinct spectral bands is detected and analyzed according to a predetermined mathematical relationship to compare the brightness and two color tones of the said leaves or objects to standards which are selectively dialed in to the apparatus. Logic circuitry is provided to constrain acceptance or rejection of the leaves or objects by the system in response to a determination that at least one of the characteristics of brightness and two color tones exceeds a predetermined deviation from the preset standards. One of the spectral bands is chosen to provide uniform reflectivity from the series of leaves or objects being sorted to normalize the size of the various objects to that of the background surface.
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Description  (OCR text may contain errors)

limited States Patent Perkins, 1H

[ Dec. 17, 1974 AUTOMATIC GRADER FOR SORTING Inventor:

Assignee:

Filed:

Appl. No.:

Joseph R. Perkins, III, Burke, Va.

AMF Incorporated, White Plains,

May 15, 1973 U.S. Cl 209/111.6, 209/1 15, 356/221,

Int. Cl. B07c 5/342 Field of Search 356/51, 221, 222, 229,

References Cited UNITED STATES PATENTS Primary ExaminerAllen N. Knowles Attorney, Agent, or Firm-George W. Price; Charles J. Worth [5 7 ABSTRACT A system and apparatus for grading and sorting to bacco leaves and other objects according to brightness and two color tones are provided. The tobacco leaves or objects are caused to traverse a background plate of known color and both are impinged by polychromatic light. The light reflected therefrom in three distinct spectral bands is detected and analyzed according to a predetermined mathematical relationship to compare the brightness and two color tones of the said leaves or objects to standards which are selectively dialed in to the apparatus. Logic circuitry is provided to constrain acceptance or rejection of the leaves or objects by the system in response to a determination that at least one of the characteristics of brightness and two color tones exceeds a predetermined deviation from the preset standards. One of the spectral bands is chosen to provide uniform reflectivity from the series of leaves or objects being sorted to normalize the size of the various objects to that of the background surface.

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Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3066797 *Nov 13, 1958Dec 4, 1962R W Gunson Seeds LtdColour sorting machines
US3373870 *Jul 8, 1966Mar 19, 1968American Tobacco CoCigar classification apparatus
US3737239 *Jul 16, 1971Jun 5, 1973Hoffmann La RocheMachine color recognition
US3744919 *Jul 16, 1971Jul 10, 1973Hanscom GColor measuring with memory
US3750883 *May 3, 1972Aug 7, 1973Fmc CorpCircuitry for sorting fruit according to color
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4222731 *Dec 12, 1978Sep 16, 1980Leo EnriettiMolding press for plastic materials
US4609108 *Jan 27, 1984Sep 2, 1986Institute Po Technicheska Kibernetika I RobotikaTobacco sorting method and apparatus
US4634881 *Jun 28, 1985Jan 6, 1987Supernova Systems, Inc.Apparatus for detecting impurities in translucent bodies
US4940850 *Dec 7, 1987Jul 10, 1990Satake Engineering Co., Ltd.Color sorting apparatus
US5265732 *Jan 21, 1993Nov 30, 1993Esm International, Inc.Variable background for a sorting machine
US6646218 *Mar 29, 2000Nov 11, 2003Key Technology, Inc.Multi-band spectral sorting system for light-weight articles
US7383840Mar 14, 2005Jun 10, 2008Universal Leaf Tobacco Company, Inc.Apparatus for scanning and sorting tobacco leaves
US8281931Sep 18, 2009Oct 9, 2012Key Technology, Inc.Apparatus and method for post-threshing inspection and sorting of tobacco lamina
US20050199252 *Mar 14, 2005Sep 15, 2005Universal Leaf Tobacco Company, Inc.Apparatus and method for scanning and sorting tobacco leaves
US20130065250 *Mar 18, 2011Mar 14, 2013Michael James HubbardKit and Method for Detecting Porous Dental Hydroxyapatite
CN102871211A *Sep 13, 2012Jan 16, 2013红云红河烟草(集团)有限责任公司Method for increasing sheeting rate of redried finished tobacco sheets
DE3428966A1 *Aug 6, 1984Feb 6, 1986Inst Tekh Kib I RobotikaMethod and apparatus for sorting tobacco leaves
DE3490661C2 *Feb 21, 1984Feb 13, 1992Aleksandr ZamotaevOptisches Verfahren zum Fruchtsortieren nach Fruchtqualit{t und Vorrichtung zur Durchf}hrung dieses Verfahrens
EP1173292A1 *Mar 29, 2000Jan 23, 2002SRC Vision, Inc.Multi-band spectral sorting system for light-weight articles
EP2107361A1 *Apr 2, 2008Oct 7, 2009Unilever PLCProcess and Apparatus for Analysing Plant Material
WO2000058035A1 *Mar 29, 2000Oct 5, 2000Src Vision IncMulti-band spectral sorting system for light-weight articles
Classifications
U.S. Classification209/565, 131/280, 356/229, 209/581, 356/407, 356/421, 356/221
International ClassificationA24B3/00, B07C5/342, B03B13/00, G01J3/51, A24B1/00, A24B1/04, A24B3/16, B03B13/02
Cooperative ClassificationB03B13/02, A24B1/04, B07C5/342, B07C5/366
European ClassificationB07C5/36C1A, A24B1/04, B07C5/342, B03B13/02