US2695098A - Method and apparatus for inspecting sheets - Google Patents

Method and apparatus for inspecting sheets Download PDF

Info

Publication number
US2695098A
US2695098A US277319A US27731952A US2695098A US 2695098 A US2695098 A US 2695098A US 277319 A US277319 A US 277319A US 27731952 A US27731952 A US 27731952A US 2695098 A US2695098 A US 2695098A
Authority
US
United States
Prior art keywords
sheets
piler
sheet
belt
deflector
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
US277319A
Other languages
English (en)
Inventor
George H Rendel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
United States Steel Corp
Original Assignee
United States Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to BE516602D priority Critical patent/BE516602A/xx
Application filed by United States Steel Corp filed Critical United States Steel Corp
Priority to US277319A priority patent/US2695098A/en
Priority to GB31759/52A priority patent/GB727927A/en
Application granted granted Critical
Publication of US2695098A publication Critical patent/US2695098A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
    • G01N21/894—Pinholes

Definitions

  • This invention relates to a method and apparatus for inspecting sheets, particularly sheets of tin plate. It is common practice to inspect tin plate for pin holes which are small perforations passing through the sheets. This is done by passing sheets between a highly concentrated light source and a photoelectric detector. -When material containing a perforation passes through the detector, light is transmitted through the perforation onto the photoelectric detector causing an electrical impulse. I have found that; these perforations are often angular and occasionally conical and that many holes are more plainly visible and more easily detected when viewed from one side of the sheet than when viewed from the other side.
  • Another object is to provide apparatus for turning sheets end to end and upside down.
  • the reference numeral 2 indicates a piler for sheets S to be inspected.
  • the sheets may be removed one by one from the piler 2 either manuallv or by means of a sheet feeder 4 such as the well known Dexter feeder.
  • a conveyor 6 is located adjacent the piler 2 and feeds the sheets to a second conveyor 8.
  • a pin hole detector comprising a light source 10 and ph tocell 12 is located between the convevors 6 and 8.
  • the photocell 12 operates a control 14 which when energized will raise a deflector 16 at the end of conveyor 8 so as to direct the erforated sheet into the pile 18.
  • a pin hole detector suitable for this purpose is shown in the copending application to Coleman and Rendel, Serial No.
  • Apparatus 32 consists of spaced apart pulleys 34 and 36 around which passes an endless belt 38.
  • One of the pulleys is driven by any suitable 2,695,098 Pa ented N v- 23, 1954 ice power means to rotate the belt 38.
  • Magnets 40 are provided beneath the belt on its upper run to hold sheets S tightly against the belt.
  • Electromagnets 42 are provided for holding sheets against the lower run of the belt.
  • An endless belt 44 surrounds the belt 38 over a substantial part of its arc of contact with the pulley 36. The belt 44 passes around pulleys 46, 38 and 50.
  • a photocell or trigger actuated switch 52 is provided adjacent the magnets 42 and actuates a control 54 for de-energizing the magnets '42 in the proper sequence to permit the sheet S to drop onto a conveyor 56 located beneath the magnets 42.
  • Conveyors 58, 60 and 62 are arranged in tandem adjacent the conveyor 56.
  • a light source 64 is provided between the conveyors 56 and 58 and a photocell 66 is located thercabove for actuating a control 68 similar to control 14.
  • the control 68 operates a deflector 70 between the conveyor 58 and 60 to deflect sheets downwardly into a perforated sheet piler 72.
  • a deflector 74 is located between the conveyor 60 and 62 and is actuated by a control 76 to deflect sheets downwardly into a pile 78.
  • a prime sheet piler 80 is located at the end of conveyor 62.
  • Sheets S are fed from the pile 2 and pass successively over the cone veyors 6 and 8. If a pin hole is detected in one of these sheets it is deflected downwardly into the pile 18. If a pin hole is not detected in the sheet but if it is off gauge as determined by the gauge 20 the deflector 28 will rise to deflect the sheet into the oil? weight pile 26. If no pin hole is detected and the sheet is the correct weight it will pass to the reversing apparatus 32 and Will be carried by the belt 38 around the pulley 36 where it is held in close engagement with the belt 38 by means of the belt 44.
  • the method of inspecting elongated sheets comprising passing sheets past a pin hole detector to detect pin holes therein from one side thereof, said sheets having a greater length on their front end than on their trailing end that will not be inspected by the detector, directing sheets with pin holes therein to a reject piler, turning the sheets end to end, then passing the sheets past a pin hole detector to detect pin holes therein from the opposite side thereof, and directing sheets with pin holes therein to a reject piler.
  • the method of inspecting elongated sheets comprising passing sheets past a pin hole detector to detect pin holes therein from one side thereof, said sheets having a greater length on their front end than on their trailing end that Will not be inspected by the detector, directing sheets with pin holes therein to a reject piler, gauging the thickness of said sheets, directing off gauge sheets to an off gauge piler, turning the sheets end to end, then passing the sheets past a pin hole detector to detect pin holes therein from the opposite side thereof, and directing sheets with pin holes therein to a reject piler.
  • the method of inspecting elongated sheets comprising passing sheets past a pin hole detector to detect pin holes therein from one side thereof, said sheets having a greater length on their front end than on their trailing end that will not be inspected by the detector, directing sheets with pin holes therein to a reject piler, turning the sheets end to end and upside down, then passing the sheets past a pin hole detector to detect pin holes therein from the opposite side thereof, directing sheets with pin holes therein to a reject piler, inspecting both sides of said sheets for surface defects, and directing sheets with defects therein to a reject piler.
  • the method of inspecting elongated sheets comprising passing sheets past a pin hole detector to detect pin holes therein from one side thereof, said sheets having a greater length on their front end than on their trailing end that will not be inspected by the detector, directing sheets with pin holes therein to a reject piler, gauging the thickness of said sheets, directing off gauge sheets to an ofi gauge piler, turning the sheets end to end and upside down, passing the turned sheets past a pin hole detector to detect pin holes therein from the opposite side thereof, directing sheets with pin holes therein to a reject piler, inspecting both sides of said sheets for surface defects, and directing sheets with defects therein to a reject piler.
  • Apparatus for inspecting elongated sheets comprising a group of conveyors over which the sheets pass, a pin hole detector adjacent the path of travel of said sheets, said sheets having a greater length on their front end than on their trailing end that will not be inspected by the detector, a deflector between two of said conveyors, a reject piler beneath said deflector, means operable by said pin hole detector to operate said deflector to direct sheets I with pin holes therein to said reject piler, a second group of conveyors over which the sheets pass, means between the two groups of conveyors for turning the sheets end to end, a second pin hole detector adjacent the path of travel of said sheets over said second group of conveyors, adeflector between two of said second group of conveyors, a reject piler beneath said second deflector, and means operable by said second pin hole detector to operate said second deflector to direct sheets with pin holes therein to said second reject piler.
  • Apparatus for inspecting elongated sheets including a thickness gauge for said sheets, a deflector between two of said conveyors, an off gauge piler beneath said last named deflector, and means operable by said gauge for operating said last named deflector to direct otf gauge sheets to said 01f gauge piler.
  • the sheet turning means comprises a pair of spaced apartpulleys, a belt passing around said pulleys, means for rotating said belt, electro-magnetic means for holding sheets against the lower run of said belt, means for demagnetizing said electro-magnetic means, and a second belt surrounding said first belt over a substantial part of its arc of contact with one of said pulleys.
  • Apparatus for inspecting elongated sheets according to claim 7 including a thickness gauge for said sheets, a deflector between two of said conveyors, an off gauge piler beneath said last named deflector, and means operable by said gauge for operating said last named deflector to direct 011 gauge sheets to said off gauge piler.
  • Apparatus for turning elongated sheets end to end and upside down comprising a pair of spaced apart pulleys located in different vertical planes, a belt passing around said pulleys, means for rotating said belt, means for feeding sheets to the top run of said belt, electro-magnetic means for holding sheets against the lower run of said belt, means for demagnetizing said electro-magnetic means to release said sheets, and a second belt surrounding said first belt over a substantial part of its arc of contact with the pulley toward which the upper run of said first belt moves.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Sorting Of Articles (AREA)
  • Controlling Sheets Or Webs (AREA)
US277319A 1952-03-18 1952-03-18 Method and apparatus for inspecting sheets Expired - Lifetime US2695098A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE516602D BE516602A (fr) 1952-03-18
US277319A US2695098A (en) 1952-03-18 1952-03-18 Method and apparatus for inspecting sheets
GB31759/52A GB727927A (en) 1952-03-18 1952-12-15 Pin-hole detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US277319A US2695098A (en) 1952-03-18 1952-03-18 Method and apparatus for inspecting sheets

Publications (1)

Publication Number Publication Date
US2695098A true US2695098A (en) 1954-11-23

Family

ID=23060336

Family Applications (1)

Application Number Title Priority Date Filing Date
US277319A Expired - Lifetime US2695098A (en) 1952-03-18 1952-03-18 Method and apparatus for inspecting sheets

Country Status (3)

Country Link
US (1) US2695098A (fr)
BE (1) BE516602A (fr)
GB (1) GB727927A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2970691A (en) * 1954-05-12 1961-02-07 Ungerer Fritz Plant for sorting strips of material differing from one or more reference characteristics
US3065850A (en) * 1958-08-29 1962-11-27 Billie B Nixon Automatic mail facing and sorting machine
US3074550A (en) * 1959-03-20 1963-01-22 Continental Can Co Photoelectric inspection of glassware
US3156173A (en) * 1961-10-16 1964-11-10 James R Meyer Magnetic conveyance and transfer system for photographic processing
US3227444A (en) * 1963-08-30 1966-01-04 Eastman Kodak Co Reversal unit for document copying apparatus
US3247963A (en) * 1964-10-23 1966-04-26 Lumbermatic Inc Automatic green chain
US4968014A (en) * 1987-08-21 1990-11-06 Minolta Camera Kabushiki Kaisha Sheet transport apparatus feeding to a plurality of trays in accordance with the sheet size of the transported media
US4999578A (en) * 1988-01-20 1991-03-12 Nec Home Electronics Ltd. Function inspecting system

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1358061A (en) * 1919-07-25 1920-11-09 Horatio F Davidson Fruit-grading machine
US1385000A (en) * 1920-06-30 1921-07-19 Griffin Button Company Machine for reversing small articles
US1873860A (en) * 1926-02-15 1932-08-23 American Can Co Tin plate sorting machine
US2063485A (en) * 1933-10-16 1936-12-08 Button Machine Company Apparatus for selecting pearl buttons
US2070339A (en) * 1934-08-28 1937-02-09 Mark E Moore Can end inspector
GB468692A (en) * 1936-01-06 1937-07-06 Leonard Joseph Blumenthal Improvements in and relating to conveyers
US2312357A (en) * 1940-03-02 1943-03-02 American Can Co Sorting machine
US2527911A (en) * 1946-03-19 1950-10-31 Buccicone Dario Magnetic sheet piling
US2540766A (en) * 1947-07-21 1951-02-06 Fmc Corp Rotary box dump
US2570288A (en) * 1949-05-03 1951-10-09 Howard Paper Mills Inc Photoelectric inspection of sheet materials

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1358061A (en) * 1919-07-25 1920-11-09 Horatio F Davidson Fruit-grading machine
US1385000A (en) * 1920-06-30 1921-07-19 Griffin Button Company Machine for reversing small articles
US1873860A (en) * 1926-02-15 1932-08-23 American Can Co Tin plate sorting machine
US2063485A (en) * 1933-10-16 1936-12-08 Button Machine Company Apparatus for selecting pearl buttons
US2070339A (en) * 1934-08-28 1937-02-09 Mark E Moore Can end inspector
GB468692A (en) * 1936-01-06 1937-07-06 Leonard Joseph Blumenthal Improvements in and relating to conveyers
US2312357A (en) * 1940-03-02 1943-03-02 American Can Co Sorting machine
US2527911A (en) * 1946-03-19 1950-10-31 Buccicone Dario Magnetic sheet piling
US2540766A (en) * 1947-07-21 1951-02-06 Fmc Corp Rotary box dump
US2570288A (en) * 1949-05-03 1951-10-09 Howard Paper Mills Inc Photoelectric inspection of sheet materials

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2970691A (en) * 1954-05-12 1961-02-07 Ungerer Fritz Plant for sorting strips of material differing from one or more reference characteristics
US3065850A (en) * 1958-08-29 1962-11-27 Billie B Nixon Automatic mail facing and sorting machine
US3074550A (en) * 1959-03-20 1963-01-22 Continental Can Co Photoelectric inspection of glassware
US3156173A (en) * 1961-10-16 1964-11-10 James R Meyer Magnetic conveyance and transfer system for photographic processing
US3227444A (en) * 1963-08-30 1966-01-04 Eastman Kodak Co Reversal unit for document copying apparatus
US3247963A (en) * 1964-10-23 1966-04-26 Lumbermatic Inc Automatic green chain
US4968014A (en) * 1987-08-21 1990-11-06 Minolta Camera Kabushiki Kaisha Sheet transport apparatus feeding to a plurality of trays in accordance with the sheet size of the transported media
US4999578A (en) * 1988-01-20 1991-03-12 Nec Home Electronics Ltd. Function inspecting system

Also Published As

Publication number Publication date
BE516602A (fr)
GB727927A (en) 1955-04-13

Similar Documents

Publication Publication Date Title
US2138645A (en) Sorting machine
US3529169A (en) Photoelectric apparatus for detecting shape of bottles
US3023900A (en) Apparatus for detecting imperfections in sheet material
US2176784A (en) Method of and apparatus for grading magnetic sheet material
JPS62249850A (ja) シート状の紙の自動選別装置
US2497149A (en) Apparatus for handling sheets during inspection
US2374174A (en) Apparatus for piling metallic sheets
US2695098A (en) Method and apparatus for inspecting sheets
US5366096A (en) Apparatus for and method of automatically detecting and eliminating cigarettes with visual defects during cigarette manufacture
US3044508A (en) Mark sensing lumber defect cutter
GB885278A (en) Inspection and sorting of sheet materials by photoelectric means
US2730233A (en) Apparatus for inspecting and classifying flat steel products
US2636603A (en) Apparatus for continuously gauging and classifying sheet material for flatness
ATE29247T1 (de) Vorrichtung zum handhaben von papierblaettern.
US5626237A (en) Process for the rapid recognition and filtering out of differently colored foreign bodies in fiber processing lines
US2563274A (en) Method and apparatus for testing pinhole detectors
US2814398A (en) Apparatus for conveying magnetizable sheets
JPH10194585A (ja) 平判枚葉自動選別装置
US3271023A (en) Sheet collating apparatus
US3218066A (en) Process and apparatus for handling sheets
US3712466A (en) Inspection and transfer mechanism
US2636602A (en) Apparatus for detecting the presence of foreign bodies on the bottoms of transparent vessels
US2541752A (en) Apparatus for inspecting sheets
US2740521A (en) Gage
US1946980A (en) Apparatus for segregating eggs