US5335790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for separating pieces of wood
Assignee: ANDRITZ-PATENTVERWALTUNGS-GESELLSCHAFT MBH A CORP OF AUSTRIA
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Filing: 1992-02-10
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Granted: 1994-08-09
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Expires: 2012-02-10
Abstract
Abstract A method and apparatus for separating pieces of wood into different qualities in a wood sorting process is characterized in that the brightness as well as the texture of the surface of the wood are measured, and the pieces of wood are separated into different quality groups according to the measurements results obtained.
Inventors
- 👤 Bertram Geiger
- 👤 Rainer Grabher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:33
CPC Classifications
B; B07; B07C; B07C5/00; B07C5/34; B07C5/342; B07C5/04; B07C5/12; B07C5/14; Y; Y10; Y10S; Y10S209/00; Y10S209/939
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
119 words
A method of separating a plurality of pieces of wood according to brightness and surface texture of said pieces of wood comprising: conveying said pieces of wood through a viewing zone, illuminating said pieces of wood and measuring brightness and determining surface texture as a function of the intensity of reflected light of each piece of wood; measuring said brightness in a plurality f measuring fields on each of said pieces of wood to obtain a plurality of measurements for each piece of wood; averaging said plurality of measurements to obtain an average measured brightness; comparing said average measured brightness with a known value; and separating said pieces of wood according to said averaged measured brightness and surface texture.
Claim 2
Independent Claim
119 words
A method of separating a plurality of pieces of wood according to brightness and surface texture of said pieces of wood comprising: conveying said pieces of wood through a viewing zone, illuminating said pieces of wood and measuring brightness and determining surface texture as a function of the intensity of reflected light of each piece of wood; measuring said brightness in a plurality f measuring fields on each of said pieces of wood to obtain a plurality of measurements for each piece of wood; averaging said plurality of measurements to obtain an average measured brightness; comparing said average measured brightness with a known value; and separating said pieces of wood according to said averaged measured brightness and surface texture.
Claim 3
Dependent Claim
36 words
The method according to claim 1, further comprising comparing said brightness of each piece of wood with a known value to obtain a comparative value and classifying said pieces of wood according to said comparative value.
Claim 4
Dependent Claim
32 words
The method according to claim 1, comprising measuring said brightness to determine an amount of bark on said pieces of wood and separating pieces of wood having a predetermined amount of bark.
Claim 5
Dependent Claim
18 words
The method according to claim 3, further comprising discarding pieces of wood having a predetermined amount of bark.
Claim 6
Dependent Claim
18 words
The method according to claim 1, further comprising vertically illuminating the pieces of wood during said measuring step.
Claim 7
Dependent Claim
28 words
The method according to claim 1, further comprising measuring the brightness of logs contacting each other, and separating data corresponding to each log in a data processing unit.
Claim 8
Dependent Claim
23 words
The method according to claim 2, further comprising adjusting said known value in relation to differences in light intensity across said viewing zone.
Claim 9
Dependent Claim
68 words
The method according to claim 1, further comprising measuring said brightness of each of said pieces of wood to obtain a measurement and to determine the length, volume and shape of said pieces, comparing said measurement with a second known value corresponding to a desired length, volume and shape of said pieces of wood and producing a second value, and separating said pieces according to said second value.
Claim 10
Dependent Claim
40 words
The method according to claim 1, further comprising passing said pieces of wood through a first apparatus prior to or after measuring said brightness of said pieces, and adjusting the operation of said first apparatus in response to said brightness.
Claim 11
Dependent Claim
59 words
The method according to claim 1, further comprising producing a first signal responsive to said measured brightness, transmitting said signal to a data processing unit and producing a control signal in response to said first signal, transmitting said control signal to a separating device and activating said separating device in response to said control signal and separating said pieces.
Claim 12
Dependent Claim
16 words
The method according to claim 1, wherein said pieces of wood are a plurality of logs.
Claim 13
Independent Claim
164 words
A method of separating a plurality of pieces of wood according to brightness and surface texture of said pieces of wood comprising: conveying said pieces of wood through a viewing zone, illuminating said pieces of wood and measuring brightness and determining surface texture as a function of the intensity of reflected light of each piece of wood; measuring said brightness in a plurality of measuring fields on each of said pieces of wood to obtain a plurality of measurements for each piece of wood; averaging said plurality of measurements to obtain an average measured brightness; comparing said average measured brightness with a known value; rotating said pieces of wood during measurement of said brightness such that each of said plurality of measuring fields defines a different area on the surface of said piece of wood, said measuring fields being arranged in a longitudinal direction and a peripheral dimension of said wood; and separating said pieces of wood according to said brightness and surface texture.
Claim 14
Independent Claim
164 words
A method of separating a plurality of pieces of wood according to brightness and surface texture of said pieces of wood comprising: conveying said pieces of wood through a viewing zone, illuminating said pieces of wood and measuring brightness and determining surface texture as a function of the intensity of reflected light of each piece of wood; measuring said brightness in a plurality of measuring fields on each of said pieces of wood to obtain a plurality of measurements for each piece of wood; averaging said plurality of measurements to obtain an average measured brightness; comparing said average measured brightness with a known value; rotating said pieces of wood during measurement of said brightness such that each of said plurality of measuring fields defines a different area on the surface of said piece of wood, said measuring fields being arranged in a longitudinal direction and a peripheral dimension of said wood; and separating said pieces of wood according to said brightness and surface texture.
Claim 15
Independent Claim
215 words
An apparatus for separating pieces of wood comprising: a first feed conveyor for carrying a plurality of pieces of wood having a longitudinal dimension; a second conveyor receiving said pieces of wood from said first feed conveyor and conveying said pieces through a viewing zone, said pieces having said longitudinal dimension and being oriented on said second conveyor transverse to a direction of travel of said pieces; said second conveyor comprising a rolling surface for rotating said pieces while being conveyed, said rolling surface comprising a black, wear-resistant surface of a plastic material; camera means in said viewing zone for viewing at least one measuring field on said pieces and measuring brightness and texture of each of said pieces of wood as a function of the intensity of reflected light and producing a first signal responsive to a measured brightness, said camera means being capable of viewing a plurality of measuring fields on a peripheral and longitudinal dimension of said pieces while said pieces are rotating; data processing means receiving said first signal and producing a control signal in response to said measured brightness and texture; and separating means receiving said control signal and being actuated by said control signal for selectively discharging said pieces of wood to one of at least two discharge conveyors.
Claim 16
Independent Claim
215 words
An apparatus for separating pieces of wood comprising: a first feed conveyor for carrying a plurality of pieces of wood having a longitudinal dimension; a second conveyor receiving said pieces of wood from said first feed conveyor and conveying said pieces through a viewing zone, said pieces having said longitudinal dimension and being oriented on said second conveyor transverse to a direction of travel of said pieces; said second conveyor comprising a rolling surface for rotating said pieces while being conveyed, said rolling surface comprising a black, wear-resistant surface of a plastic material; camera means in said viewing zone for viewing at least one measuring field on said pieces and measuring brightness and texture of each of said pieces of wood as a function of the intensity of reflected light and producing a first signal responsive to a measured brightness, said camera means being capable of viewing a plurality of measuring fields on a peripheral and longitudinal dimension of said pieces while said pieces are rotating; data processing means receiving said first signal and producing a control signal in response to said measured brightness and texture; and separating means receiving said control signal and being actuated by said control signal for selectively discharging said pieces of wood to one of at least two discharge conveyors.
Claim 17
Independent Claim
82 words
A method of separating a plurality of pieces of wood according to brightness and surface texture of said pieces of wood comprising: conveying said pieces of wood through a viewing zone, illuminating said pieces of wood and measuring brightness and determining surface texture as a function of the intensity of reflected light of each piece of wood; said viewing zone including a rolling surface having a black wear-resistant surface; and separating said pieces of wood according to said brightness and surface texture.
Claim 18
Independent Claim
82 words
A method of separating a plurality of pieces of wood according to brightness and surface texture of said pieces of wood comprising: conveying said pieces of wood through a viewing zone, illuminating said pieces of wood and measuring brightness and determining surface texture as a function of the intensity of reflected light of each piece of wood; said viewing zone including a rolling surface having a black wear-resistant surface; and separating said pieces of wood according to said brightness and surface texture.
Claim 19
Independent Claim
122 words
A method of separating logs according to brightness of a surface of said logs comprising: conveying and rotating said logs through a viewing zone; said viewing zone including a rolling surface having a black wear-resistant surface; illuminating said logs in said viewing zone; measuring brightness of each of said logs by at least one camera means, said camera means producing a first signal responsive to said brightness as a function of the intensity of reflected light, and transmitting said first signal to data processing means; comparing said first signal with a known value and producing a control signal in response to said comparison; and transmitting said control signal to a separating means and separating said logs in response to said control signal.
Claim 20
Independent Claim
122 words
A method of separating logs according to brightness of a surface of said logs comprising: conveying and rotating said logs through a viewing zone; said viewing zone including a rolling surface having a black wear-resistant surface; illuminating said logs in said viewing zone; measuring brightness of each of said logs by at least one camera means, said camera means producing a first signal responsive to said brightness as a function of the intensity of reflected light, and transmitting said first signal to data processing means; comparing said first signal with a known value and producing a control signal in response to said comparison; and transmitting said control signal to a separating means and separating said logs in response to said control signal.
References Cited (Backward Citations)
US3456700A
Cited
US3642041A
Cited
US3812965A
Cited
US4185672A
Cited
DE3039979A1
Cited
DE3211344A1
Cited
US4679075A
Cited
US4992949A
Cited
US4924088A
Cited
DE3910378A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-08-08 | 1998-02-07 | 1998-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-08 | 2002-02-07 | 2002-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-08 | 2006-02-07 | 2006-08-09 | $7700.00 | Window Closed / Lapsed |