US3778618A - Photodetection of non-opaque objects transported along a conveyor by use of a light blocking opaque flap - Google Patents

Photodetection of non-opaque objects transported along a conveyor by use of a light blocking opaque flap Download PDF

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Publication number
US3778618A
US3778618A US00251493A US3778618DA US3778618A US 3778618 A US3778618 A US 3778618A US 00251493 A US00251493 A US 00251493A US 3778618D A US3778618D A US 3778618DA US 3778618 A US3778618 A US 3778618A
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US
United States
Prior art keywords
conveyor
photosensor
flap
opaque
light source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00251493A
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English (en)
Inventor
K Laskowski
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Xerox Corp
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Xerox Corp
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Filing date
Publication date
Application filed by Xerox Corp filed Critical Xerox Corp
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Publication of US3778618A publication Critical patent/US3778618A/en
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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K13/00—Conveying record carriers from one station to another, e.g. from stack to punching mechanism
    • G06K13/02—Conveying record carriers from one station to another, e.g. from stack to punching mechanism the record carrier having longitudinal dimension comparable with transverse dimension, e.g. punched card
    • G06K13/06—Guiding cards; Checking correct operation of card-conveying mechanisms
    • G06K13/067—Checking presence, absence, correct position, or moving status of cards
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/10—Measuring sum, difference or ratio
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation

Definitions

  • ABSTRACT Photodetection of the passage of transparent or translucent sheets along a conveyor is effected by placing an opaque flexible flap in the path of movement of the sheets on the conveyor, The flap is engaged and moved forward by the sheets a short distance along the conveyor, into the photodetector light path.
  • the present invention relates to the photoelectric detection of articles, and more particularly to the photoelectric detection of the movement of a transparent or translucent article passed a detection point.
  • an opaque light interrupter is positioned in the path of the conveyor and is adapted to be moved into the photodetector light path by the article to be detected, to cut off the illumination of the photosensor regardless of the light transmission characteristics of the article. Accordingly, transparent or translucent articles will be detected, and any perforations or light windows in the article will not affect the photodetection process.
  • Another object of the present invention is to provide for such detection regardless of the opacity or transparency of the article.
  • FIG. 1 is a side elevation view of a'conveyor and photodetector arrangement embodying the principles of the present invention
  • FIG. 2 is a top plan view of the system shown in FIG. 1;
  • FIGS. 3A-D illustrate the step by step effect of the traverse of a sheet along the conveyor and past the photodetector of FIG. 1.
  • an endless belt conveyor'lo having a pair of end drums 11 and 12, about which run the transversely spaced endless belts 13. Also shown are a pair of feed rolls 14 for delivering sheets 15 to one end of the conveyor 10, and a pair of between the light source 21 and photosensor 22, illumination of the photosensor is interrupted, and the presence of the object is thus detected.
  • sheets 15 are transparent or translucent, operation of the photodetector 20 is ineffective or unreliable.
  • a piece of flexible opaque material 23 which may for example be a fabric or plastic sheet, is suspended from a support bar 24, and depends therefrom pastthe level of the upper flight of the conveyor 10, into the path of any oncoming objects on the conveyor.
  • the arrival of an object pushes this flap 23 into the light path from the light source 21 to the photosensor 22, thereby detecting the arrival of the object.
  • FIGS. 3A-D it will be observed in FIG. 3A that as the leading edge of a sheet 15 approaches the photodetector 20, the flap 23 hangs down from bar 24 below and between the upper flight of belts 13 of conveyor 10, leaving the light path unobstructed from light source 21 to photosensor 22.
  • a conveyor and a photodetector for detecting the passage of spaced articles along said conveyor, said photodetector comprising a photosensor on one side of said conveyor, a light source on the other side of said conveyor positioned to illuminate said photosensor, and a movable opaque element mounted above said conveyor and adjacent said photosensor and light source on the upstream side thereof in the path of articles on said conveyor, said opaque element normally lying outside the light path from said light source to said photosensor, whereby said element is moved between said light source and photosensor by the passage of each article along said conveyor past said photodetector.
  • said opaque element being a flexible flap depending from a support above said conveyor.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Control Of Conveyors (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Controlling Sheets Or Webs (AREA)
US00251493A 1972-05-08 1972-05-08 Photodetection of non-opaque objects transported along a conveyor by use of a light blocking opaque flap Expired - Lifetime US3778618A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US25149372A 1972-05-08 1972-05-08

Publications (1)

Publication Number Publication Date
US3778618A true US3778618A (en) 1973-12-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00251493A Expired - Lifetime US3778618A (en) 1972-05-08 1972-05-08 Photodetection of non-opaque objects transported along a conveyor by use of a light blocking opaque flap

Country Status (4)

Country Link
US (1) US3778618A (en))
JP (1) JPS4942050A (en))
GB (1) GB1406170A (en))
NL (1) NL7306192A (en))

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2937919A1 (de) * 1978-09-21 1980-04-10 Cii Honeywell Bull Aufnahmefach fuer dokumente mit einem detektionssystem zur ermittlung einer ueberfuellung mit blaettern
US4523523A (en) * 1982-12-08 1985-06-18 Pitney Bowes Inc. Mailing machine with envelope insertion sensing apparatus
US5130557A (en) * 1989-11-28 1992-07-14 Grafotec Kotterer Gmbh Photoelectric web tension detector for signaling web break
US5451795A (en) * 1994-04-28 1995-09-19 Crathern & Smith, Inc. Apparatus for spotting labels onto a surface having a transparent conveyor means
US5955740A (en) * 1997-12-16 1999-09-21 Eastman Kodak Company Inspection method and apparatus for determining the side-up orientation of an object resting on a flat surface
US6046462A (en) * 1997-12-16 2000-04-04 Eastman Kodak Company Method and apparatus for determining orientation of parts resting on a flat surface

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5075654U (en)) * 1973-11-13 1975-07-02
JPS51101556A (en)) * 1975-03-05 1976-09-08 Hitachi Ltd
JPS5322712A (en) * 1976-08-16 1978-03-02 Teac Corp Cassette magnetic recorder*reproducer
JPS5734594Y2 (en)) * 1976-11-26 1982-07-30
SE448667B (sv) * 1985-06-26 1987-03-16 Frigoscandia Contracting Ab Sett att styra flodet av ett livsmedel in i en apparat for overforing av livsmedlet till fast tillstand samt apparat for settets genomforande
CN107934449B (zh) * 2017-10-13 2020-04-07 弗埃斯工业技术（苏州）有限公司 自动分辨不规则镂空料件两端的装置
CN113501282B (zh) * 2021-09-13 2021-11-30 山东金科星机电股份有限公司 一种基于图像数据处理的存储器管理系统及使用方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1946980A (en) * 1931-12-28 1934-02-13 Loomis Lowell Apparatus for segregating eggs
US2171362A (en) * 1938-05-06 1939-08-29 Westinghouse Electric & Mfg Co Photocell system to control spacing of traveling articles
US3105152A (en) * 1959-01-12 1963-09-24 Nash Paul Inspection of sheet materials by photoelectric means
US3334239A (en) * 1962-06-22 1967-08-01 Nash Paul Pivotal light-gate for detecting surface elevations in sheet materials

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1946980A (en) * 1931-12-28 1934-02-13 Loomis Lowell Apparatus for segregating eggs
US2171362A (en) * 1938-05-06 1939-08-29 Westinghouse Electric & Mfg Co Photocell system to control spacing of traveling articles
US3105152A (en) * 1959-01-12 1963-09-24 Nash Paul Inspection of sheet materials by photoelectric means
US3334239A (en) * 1962-06-22 1967-08-01 Nash Paul Pivotal light-gate for detecting surface elevations in sheet materials

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2937919A1 (de) * 1978-09-21 1980-04-10 Cii Honeywell Bull Aufnahmefach fuer dokumente mit einem detektionssystem zur ermittlung einer ueberfuellung mit blaettern
US4523523A (en) * 1982-12-08 1985-06-18 Pitney Bowes Inc. Mailing machine with envelope insertion sensing apparatus
US5130557A (en) * 1989-11-28 1992-07-14 Grafotec Kotterer Gmbh Photoelectric web tension detector for signaling web break
US5451795A (en) * 1994-04-28 1995-09-19 Crathern & Smith, Inc. Apparatus for spotting labels onto a surface having a transparent conveyor means
WO1995030141A1 (en) * 1994-04-28 1995-11-09 Crathern & Smith, Inc. Improved apparatus for spotting labels on to a surface
US5955740A (en) * 1997-12-16 1999-09-21 Eastman Kodak Company Inspection method and apparatus for determining the side-up orientation of an object resting on a flat surface
US6046462A (en) * 1997-12-16 2000-04-04 Eastman Kodak Company Method and apparatus for determining orientation of parts resting on a flat surface

Also Published As

Publication number Publication date
NL7306192A (en)) 1973-07-25
JPS4942050A (en)) 1974-04-20
GB1406170A (en) 1975-09-17

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