WO2011145327A1 - 布片検査装置および検査方法 - Google Patents
布片検査装置および検査方法 Download PDFInfo
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- WO2011145327A1 WO2011145327A1 PCT/JP2011/002722 JP2011002722W WO2011145327A1 WO 2011145327 A1 WO2011145327 A1 WO 2011145327A1 JP 2011002722 W JP2011002722 W JP 2011002722W WO 2011145327 A1 WO2011145327 A1 WO 2011145327A1
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- cloth
- inspection
- conveyor
- cloth piece
- piece
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Classifications
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06H—MARKING, INSPECTING, SEAMING OR SEVERING TEXTILE MATERIALS
- D06H3/00—Inspecting textile materials
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- 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
- G01N21/898—Irregularities in textured or patterned surfaces, e.g. textiles, wood
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06H—MARKING, INSPECTING, SEAMING OR SEVERING TEXTILE MATERIALS
- D06H3/00—Inspecting textile materials
- D06H3/08—Inspecting textile materials by photo-electric or television means
-
- 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
-
- 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
- G01N21/898—Irregularities in textured or patterned surfaces, e.g. textiles, wood
- G01N21/8983—Irregularities in textured or patterned surfaces, e.g. textiles, wood for testing textile webs, i.e. woven material
-
- 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
- G01N21/94—Investigating contamination, e.g. dust
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/36—Textiles
-
- 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
- G01N21/94—Investigating contamination, e.g. dust
- G01N2021/945—Liquid or solid deposits of macroscopic size on surfaces, e.g. drops, films, or clustered contaminants
Definitions
- the present invention relates to a piece inspection apparatus and an inspection method. More particularly, the present invention relates to a cloth piece inspection apparatus and an inspection method for inspecting a cloth piece such as a towel that has been washed and dried for defects such as dirt and tear.
- the cloth piece inspection apparatus there is an apparatus disclosed in Patent Document 1. As shown in FIG. 7, the apparatus is transported through a series of transport conveyors 101, a camera 104 that inspects the surface of a piece of cloth that is transported through a front-side transport unit 101A in the series of transport conveyors 101, and a back-side transport unit 101B. And a camera 105 for inspecting the back surface of the cloth piece.
- a camera 104 that inspects the surface of a piece of cloth that is transported through a front-side transport unit 101A in the series of transport conveyors 101
- a back-side transport unit 101B a camera 105 for inspecting the back surface of the cloth piece.
- an object of the present invention is to provide a cloth piece inspection device and an inspection method that can reliably distinguish between dirt and tear and have high dirt detection accuracy.
- the cloth piece inspection apparatus includes a first inspection camera for photographing the reflected light of the cloth piece and a second inspection camera for photographing the transmitted light of the cloth piece.
- the cloth inspection apparatus according to a second aspect of the present invention is the cloth inspection apparatus according to the first aspect, wherein the first inspection camera images the reflected light on the surface of the cloth, and the second inspection camera also images the reflected light on the back surface of the cloth. It is characterized by being.
- a cloth piece inspection apparatus is the cloth piece inspection apparatus according to the first or second aspect, further comprising an inspection table through which the cloth piece passes, the inspection table having a dark color portion and a translucent portion, and the first inspection camera is The cloth piece passing through the dark color part is photographed, and the second inspection camera photographs the cloth piece passing through the translucent part.
- the cloth piece inspection device includes, in the third aspect of the invention, a first conveyor to which the cloth pieces are supplied and a second conveyor connected to the first conveyor, and the inspection table includes the first conveyor and the first conveyor. The edge on the second conveyor side of the inspection table protrudes from a line connecting the rear end of the first conveyor and the front end of the second conveyor.
- the speed of the second conveyor is faster than that of one conveyor.
- the cloth piece inspection method of the fifth invention the reflected light of the cloth piece is photographed, the transmitted light of the cloth piece is photographed, and a portion where both the reflected light and the transmitted light are darker than the surroundings at the same position of the cloth piece is stained. The reflected light is determined to be darker than the surroundings and the transmitted light is determined to be broken at the same position of the cloth piece.
- a portion where both the reflected light and the transmitted light are darker than the surroundings at the same position of the cloth piece is determined to be dirty, and the reflected light is darker than the surroundings at the same position of the cloth piece, and the transmitted light is from the surroundings.
- the first inspection camera captures the reflected light on the surface of the cloth piece
- the second inspection camera captures the reflected light on the back surface of the cloth piece. Can be detected, and dirt detection accuracy is high.
- the third invention since the first inspection camera photographs the reflected light of the cloth piece that passes through the dark color portion, the cloth stain can be photographed darker than the surroundings, and the tear is set as the dark color portion color than the surroundings. It can shoot darkly.
- the second inspection camera captures the transmitted light of the cloth piece that passes through the translucent portion, the tear can be photographed brighter than the surroundings, and the dirt inside the cloth piece that cannot be recognized by the reflected light is emphasized. You can shoot darker than the surroundings.
- the speed of the second conveyor is faster than that of the first conveyor, a force for pulling the cloth piece in the vertical direction is applied, and the wrinkles of the cloth piece can be extended.
- the inspection table protrudes, the cloth pieces are rubbed on the inspection table when passing between the first conveyor and the second conveyor.
- the wrinkles of the cloth pieces can be extended. That is, since it is possible to simultaneously perform wrinkle stretching and defect inspection of the cloth piece, the entire apparatus is small and the processing speed is high.
- the fifth aspect of the invention it is determined that the portion where both the reflected light and the transmitted light are darker than the surroundings at the same position of the cloth piece is dirty, the reflected light is darker than the surroundings at the same position of the cloth piece, and the transmitted light is from the surroundings.
- the cloth piece inspection apparatus As shown in FIG. 1, the cloth piece inspection apparatus according to the first embodiment of the present invention is integrated with a cloth piece wrinkle stretching apparatus, and includes a first conveyor 11, a second conveyor 12, and a third conveyor 13. These are fixed to a frame (not shown).
- the first conveyor 11 is a conveyor on which a cloth piece T such as a towel that has been washed and dried by an operator is loaded, and the front end (the right end in FIG. 1) has a waist-like height so that the worker can easily place the cloth piece T thereon.
- the loading surface faces the worker by having an inclination.
- a second conveyor 12 is connected to the rear end (left end in FIG.
- first conveyor 11 1) of the first conveyor 11, and a third conveyor 13 is connected to the rear end of the second conveyor 12. And the rear end of the 3rd conveyor 13 is connected to the processing apparatus of the next process, for example, the conveyor C of a folding apparatus.
- the widths of the first, second and third conveyors 11, 12 and 13 are dimensioned so that the width of the cloth piece T is sufficiently accommodated.
- the speed of the second conveyor 12 is set to be higher than that of the first conveyor 11, and the speed of the third conveyor 13 is set to be higher than that of the second conveyor 12.
- the speed of the first conveyor 11 is set to 15 m / min
- the speed of the second conveyor 12 is set to 25 to 30 m / min
- the speed of the third conveyor 13 is set to 50 m / min.
- the inspection table 20 is fixed between the rear end of the second conveyor 12 and the front end of the third conveyor 13.
- the inspection table 20 is a rectangular plate in plan view having the same width as the first, second, and third conveyors 11, 12, and 13.
- the front edge of the inspection table 20 (the edge on the second conveyor 12 side) has the same height as or slightly lower than the rear end of the second conveyor 12, and the cloth piece T is in the second conveyor 12. It flows smoothly from the inspection table 20 to the inspection table 20.
- the rear edge of the inspection table 20 (the edge on the third conveyor 13 side) is set higher than the front end of the third conveyor 13. That is, the rear edge portion of the inspection table 20 protrudes from a line connecting the rear end of the second conveyor 12 and the front end of the third conveyor 13.
- Press rollers 31,..., 35 are provided above the first, second, and third conveyors 11, 12, and 13 to press the cloth pieces T against the stacking surfaces of the conveyors 11, 12, and 13.
- the first presser roller 31 is positioned in front of the first conveyor 11 (to the right in FIG. 1) and presses the cloth piece T loaded by the worker so that it does not fall.
- the second presser roller 32 is located at the rear end of the first conveyor 11, the third presser roller 33 is located near the center of the second conveyor 12, and the cloth pieces T are the first conveyor 11 and the second conveyor 12, respectively. It can be pushed to move according to the speed.
- the fourth presser roller 34 is located at the rear end of the second conveyor 12, the fifth presser roller 35 is located at the front end of the third conveyor 13, and the cloth pieces T of the second conveyor 12 and the third conveyor 13, respectively.
- the presser is moved so as to move according to the speed, and the cloth T is pressed so as to rub against the inspection table 20.
- the 1st conveyor and the 2nd conveyor as described in a claim are numbered for convenience, and another conveyor may be added before and after that.
- the 2nd conveyor 12 is equivalent to the 1st conveyor as described in a claim
- the 3rd conveyor 13 is equivalent to the 2nd conveyor as described in a claim.
- a vacuum box may be provided below the conveyors 11, 12, and 13, or a compression conveyor that faces and contacts the stacking surfaces of the conveyors 11, 12, and 13 may be provided.
- a first inspection camera 41 is provided on the front side (upper side in FIG. 2) of the inspection table 20 to photograph the cloth T passing through the inspection table 20 from the surface.
- a second inspection camera 42 for photographing the cloth piece T passing through the inspection table 20 from the back surface is provided (on the lower side in FIG. 2).
- Each of the first and second inspection cameras 41 and 42 is connected to an image processing device (not shown), and can output a photographed image as an electrical signal.
- the first and second inspection cameras 41 and 42 for example, line cameras that photograph the cloth piece T linearly in the width direction (the direction perpendicular to the paper surface in FIG. 2) are used.
- the surface of the cloth T that does not contact the inspection table 20 is referred to as the front surface, and the surface that contacts the surface is referred to as the back surface. Accordingly, the front and back surfaces inherent to the cloth piece T do not necessarily match. The front and back surfaces described in the claims do not necessarily match the front and back surfaces unique to the cloth piece.
- the inspection table 20 includes a black black portion 21 and a transparent transparent portion 22.
- the black portion 21 is formed in a band shape in the width direction (perpendicular to the paper surface in FIG. 2) on the second conveyor 12 side of the inspection table 20, and the transparent portion 22 is formed on the third conveyor 13 side of the inspection table 20. It is formed in a band shape in the width direction.
- the first inspection camera 41 has an imaging position on the black portion 21 and photographs the cloth piece T passing through the black portion 21 from the surface.
- the second inspection camera 42 has an imaging position on the transparent part 22, and photographs the cloth piece T passing through the transparent part 22 from the back surface through the transparent part 22.
- the black portion 21 corresponds to the dark color portion described in the claims.
- the black portion 21 may be other colors such as gray instead of black, and an optimal color may be selected for the defect determination described later.
- the transparent part 22 is corresponded to the translucent part as described in a claim.
- the transparent portion 22 may be made of a material that transmits light, such as milky white, instead of being transparent, and this may also be performed by selecting an optimum color for determining a defect described later.
- the first light source 51 and the second light source 52 are provided on the front side of the inspection table 20 and illuminate the imaging position of the first inspection camera 41.
- the third light source 53 and the fourth light source 54 are provided on the back side of the inspection table 20 and illuminate the imaging position of the second inspection camera 42. For this reason, the 1st inspection camera 41 can image
- a mirror 60 is provided in the vicinity of the second light source 52 so as to reflect the light from the second light source 52 and illuminate the imaging position of the second inspection camera 42 from the front side. For this reason, the light from the second light source 52 is transmitted through the cloth T passing therethrough from the front surface side to the back surface side, and the transmitted light can be photographed by the second inspection camera 42.
- an image as shown in FIG. 3 is obtained. That is, an image (A) on the surface of the cloth piece whose background is black (black portion 21) and an image (B) on the back face of the cloth piece whose background is white (light transmitted through the transparent portion 22) are obtained.
- the cloth surface image (A) with the cloth back surface image (B), it is possible to determine that the portion of the cloth T where the front and back surfaces are both darker than the surroundings is dirty. Further, at the same position of the cloth piece T, it can be determined that the front surface is darker than the surrounding and the back surface is brighter than the surrounding. Thus, by reliably discriminating between dirt and tear, the dirty cloth piece T can be reused for washing and the broken cloth piece T can be discarded. Even without washing, the processing efficiency is good.
- the cloth piece T without a defect, the cloth piece T with dirt, and the cloth piece T with a tear are carried out. Each can be sorted automatically.
- FIG. 5 When there is dirt inside the cloth piece T, an image as shown in FIG. 5 is obtained. This is the case where, for example, the pile surface on the towel surface is not soiled but the ground is soiled, and such soil does not appear on the surface, so that it is difficult to detect by photographing reflected light.
- the cloth surface image (A) the dirt inside the cloth piece is displayed darker than the surroundings.
- the cloth back image (B) since the transmitted light is photographed, the dirt inside the cloth is emphasized and displayed darker than the surroundings. For this reason, it is possible to detect dirt inside the cloth piece that cannot be detected by the reflected light, and the detection accuracy is high.
- the reflected light on the cloth surface is photographed with the first inspection camera and the reflected light on the back surface of the cloth is photographed with the second inspection camera, even a cloth piece having dirt on only one surface is detected. be able to.
- one of the front surface and the back surface can be determined to be darker than the surroundings, and the other can be determined to be a portion having the same brightness as the surroundings.
- the dirt detection accuracy is high.
- the light from the second light source 52 can be directly photographed by the second inspection camera 42 during normal times (when the cloth piece T does not pass through the inspection table 20). Therefore, it is possible to monitor the light amount level of the second light source 52 in a normal state, thereby making it possible to judge the deterioration of the light sources 51, 52, 53, and 54.
- the cloth piece inspection apparatus according to the second embodiment of the present invention is not integrated with the cloth piece wrinkle stretching apparatus, unlike the first embodiment.
- the cloth piece inspection device can be a single device.
- it can comprise so that the reflected light and transmitted light of the cloth piece T can be image
- the optimal arrangement of the cloth inspection device can be selected from the size of the entire device, processing efficiency, and the like.
- the cloth piece inspection apparatus includes a first conveyor 11, a second conveyor 12, and a third conveyor 13, and each is fixed to a frame (not shown). Further, the first inspection table 20 having only the black portion 21 between the rear end of the first conveyor 11 and the front end of the second conveyor 12 is connected between the rear end of the second conveyor 12 and the front end of the third conveyor 13. A second inspection table 20 'having only the transparent portion 22 is fixed therebetween.
- the inspection table described in the claims is not limited to a single one, but includes a concept in which a dark color part and a transparent part are separated into a plurality of parts.
- the black portion 21 may be other colors such as gray instead of black, and the transparent portion 22 may be made of a material that transmits light such as milky white instead of being transparent.
- a first inspection camera 41 is provided on the front side of the first inspection table 20 to photograph the cloth piece T passing through the black portion 21 from the surface, and passes through the transparent part 22 on the front side of the second inspection table 20 ′.
- a second inspection camera 42 for photographing the cloth piece T from the surface is provided.
- the first inspection camera 41 has an imaging position on the black portion 21, and the second inspection camera 42 has an imaging position on the transparent portion 22.
- a first light source 51 and a second light source 52 are provided on the front side of the first inspection table 20 to illuminate the imaging position of the first inspection camera 41.
- a third light source 53 and a fourth light source 54 are provided on the front side of the second inspection table 20 ′, and illuminate the imaging position of the second inspection camera 42. Therefore, both the first and second inspection cameras 41 and 42 can capture the reflected light on the cloth surface.
- a fifth light source 55 is provided on the back side of the second inspection table 20 'so that the imaging position of the second inspection camera 42 is illuminated from the back side. For this reason, the light from the fifth light source 55 is transmitted through the cloth T passing therethrough from the back surface side to the front surface side, and the transmitted light can be photographed by the second inspection camera 42.
- the cloth piece T moves to the left in FIG. 6 by operation
- both dirt and tear are displayed darker than the surroundings in the image by the first inspection camera 41, and the dirt is darker than the surroundings in the image by the second inspection camera 42. Displayed, and tears appear brighter than their surroundings. For this reason, it is possible to reliably discriminate between dirt and tear, and the processing efficiency is good.
- the image obtained by the second inspection camera 42 since the transmitted light is photographed, the dirt inside the cloth piece is emphasized and displayed darker than the surroundings. For this reason, it is possible to detect dirt inside the cloth piece that cannot be detected by the reflected light, and the detection accuracy is high.
- the light level of the fifth light source 55 in the normal state can be monitored by the second inspection camera 42, and thereby the deterioration of the light sources 51, 52, 53, 54 can be determined.
- the 2nd inspection camera 42 is provided in the front side of 2nd inspection stand 20 ', the reflected light of a cloth back surface cannot be image
- even a piece of cloth having dirt only on the back surface can be detected because the dirt can be displayed darker than the surroundings by transmitted light.
- the inspection table 20 does not have to be one, and the black portion 21 and the transparent portion 22 may be divided into two.
- the second inspection camera 42 need not be provided on the back side of the inspection table 20, but may be provided on the front side. For these, the optimum arrangement can be selected based on constraints such as the size and shape of the cloth inspection apparatus.
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Abstract
Description
ランドリー工場においては布片を洗濯・乾燥した後、汚れや破れ等の欠陥がないか検査した後に、欠陥がない布片のみを折畳み機で折畳む作業が行なわれる。
布片の検査を作業員が目視で行う場合、作業員によって良否の判定が異なる場合があるので、近年ではこの作業は布片検査装置によって行われている。
図7に示すように、本装置は一連の搬送コンベア101と、一連の搬送コンベア101における表向き搬送部101Aを搬送される布片の表面を検査するカメラ104と、裏向き搬送部101Bを搬送される布片の裏面を検査するカメラ105とを備えている。
布片を表向き搬送部101Aおよび裏向き搬送部101Bに搬送し、カメラ104,105で撮影することで、表裏両面の検査が可能となっている。
また、例えばタオル表面のパイル地は汚れていないが下地が汚れているような場合には汚れの検出が難しいため、このような汚れの検出精度の向上が望まれていた。
第2発明の布片検査装置は、第1発明において、前記第1検査カメラは前記布片表面の反射光を撮影し、前記第2検査カメラは前記布片裏面の反射光も撮影するものであることを特徴とする。
第3発明の布片検査装置は、第1または第2発明において、前記布片が通過する検査台を備え、該検査台は暗色部と透光部とを有し、前記第1検査カメラは前記暗色部を通過する布片を撮影し、前記第2検査カメラは前記透光部を通過する布片を撮影するものであることを特徴とする。
第4発明の布片検査装置は、第3発明において、前記布片が供給される第1コンベアと、該第1コンベアに接続する第2コンベアとを備え、前記検査台は前記第1コンベアと前記第2コンベアとの間に位置し、前記検査台の前記第2コンベア側の縁部が、前記第1コンベアの後端と前記第2コンベアの前端とを結ぶ線より突出しており、前記第1コンベアに比べて前記第2コンベアの方が速度が速いことを特徴とする。
第5発明の布片検査方法は、布片の反射光を撮影し、前記布片の透過光を撮影し、前記布片の同位置において反射光と透過光が共に周囲よりも暗い部分を汚れと判断し、前記布片の同位置において反射光は周囲よりも暗く、透過光は周囲よりも明るい部分を破れと判断することを特徴とする。
第2発明によれば、第1検査カメラで布片表面の反射光を撮影するとともに、第2検査カメラで布片裏面の反射光を撮影することにより、片方の面にのみ汚れがある布片であっても検出することができ、汚れの検出精度が高い。
第3発明によれば、第1検査カメラは暗色部を通過する布片の反射光を撮影するので、布片の汚れを周囲よりも暗く撮影できると共に、破れを暗色部の色として周囲よりも暗く撮影することができる。また、第2検査カメラは透光部を通過する布片の透過光を撮影するので、破れを周囲よりも明るく撮影することができると共に、反射光では分からない布片内部の汚れを強調して周囲よりも暗く撮影できる。
第4発明によれば、第1コンベアに比べて第2コンベアの方が速度が速いので、布片に縦方向に引っ張る力が加わり、布片のシワを伸ばすことができる。検査台が突出しているので、布片は第1コンベアと第2コンベアとの間を通過する際に検査台で擦られる。布片を第1コンベアと第2コンベアで引っ張りながら検査台で擦ることにより、布片のシワを伸ばすことができる。すなわち、布片のシワ伸ばしと欠陥の検査を同時に行うことができるので、装置全体が小さく、処理速度が速い。
第5発明によれば、布片の同位置において反射光と透過光が共に周囲よりも暗い部分を汚れと判断し、布片の同位置において反射光は周囲よりも暗く、透過光は周囲よりも明るい部分を破れと判断することで、汚れと破れを確実に判別することができる。そのため、汚れのある布片は再度洗濯に回し、破れのある布片は破棄することができ、破れのある布片を何度も洗濯することがなく、処理効率が良い。
(第1実施形態)
図1に示すように、本発明の第1実施形態に係る布片検査装置は、布片シワ伸ばし装置と一体となっており、第1コンベア11、第2コンベア12、第3コンベア13を備え、それぞれ図示しないフレームに固定されている。
第1コンベア11は、作業員が洗濯・乾燥済みのタオル等の布片Tを積載するコンベアであり、作業員が布片Tを載せやすいように前端(図1における右端)が腰程度の高さとなっており、傾斜を有すことにより積載面が作業員に対面するようになっている。第1コンベア11の後端(図1における左端)には第2コンベア12が接続されており、第2コンベア12の後端には第3コンベア13が接続されている。そして、第3コンベア13の後端には次工程の処理装置、例えば折畳み装置のコンベアCに接続されている。
これら第1,第2,第3コンベア11,12,13の横幅は、布片Tの横幅が十分に収まるような寸法になっている。
また、押えローラ31,・・・,35に代えて、他の押え機構を設ける実施形態としてもよい。例えば、コンベア11,12,13の下方にバキュームボックスを設けてもよいし、コンベア11,12,13の積載面に対面し接触する圧迫コンベアを設けてもよい。
このように、布片のシワ伸ばしと、後述の欠陥の検査を同時に行うことができるので、装置全体が小さく、処理速度が速い。
第1,第2検査カメラ41,42としては、例えば布片Tをその幅方向(図2における紙面に対して垂直方向)に直線状に撮影するラインカメラが用いられる。
なお、説明の便宜のため布片Tの検査台20に接しない方の面を表面とし、接する方の面を裏面とする。したがって、布片T固有の表面、裏面とは必ずしも一致しない。特許請求の範囲に記載の表面、裏面も、布片固有の表面、裏面とは必ずしも一致しない。
第1検査カメラ41は黒色部21上に撮像位置があり、黒色部21を通過する布片Tを表面から撮影する。一方、第2検査カメラ42は透明部22上に撮像位置があり、透明部22を通過する布片Tを透明部22を介して裏面から撮影する。
なお、黒色部21は特許請求の範囲に記載の暗色部に相当する。黒色部21は黒色に代えて灰色など他の色としてもよく、後述の欠陥の判断に最適な色を選択すればよい。また、透明部22は特許請求の範囲に記載の透光部に相当する。透明部22は透明に代えて乳白色など光が透過する材質であればよく、これも後述の欠陥の判断に最適な色を選択すればよい。
布片表面画像(A)においては汚れと破れは共に周囲(布片の色)よりも暗く表示される。これは、汚れている部分は汚れそのものの色により暗くなり、破れている部分は破れた穴から見える黒色部21の色により暗くなるためである。一方、布片裏面画像(B)においては汚れは周囲よりも暗く表示され、破れは周囲よりも明るく表示される。これは、汚れている部分は汚れそのものの色により暗くなり、破れている部分は破れた穴から第2光源52の光が直接届くので明るくなるためである。
このように、汚れと破れを確実に判別することで、汚れのある布片Tは再度洗濯に回し、破れのある布片Tは破棄することができるので、破れのある布片Tを何度も洗濯することがなく、処理効率が良い。
これは、例えばタオル表面のパイル地は汚れていないが下地が汚れているような場合であって、このような汚れは表面に現れないので反射光の撮影では検出が困難である。
図5に示すように、布片表面画像(A)においては布片内部の汚れは周囲よりもうす暗く表示される。一方、布片裏面画像(B)においては、透過光を撮影するので布片内部の汚れが強調され、周囲よりも暗く表示される。
そのため、反射光では分からない布片内部の汚れも検出することができ、検出精度が高い。
具体的には、布片Tの同位置において表面か裏面の一方は周囲よりも暗く、他方は周囲と同程度の明るさの部分も汚れと判断することができる。これにより、片方の面にのみ汚れがある布片であっても検出することができ、汚れの検出精度が高い。
図6に示すように、本発明の第2実施形態に係る布片検査装置は、第1実施形態と異なり布片シワ伸ばし装置と一体となっていない。このように、布片検査装置を単独の装置とできるのは言うまでもない。また、布片Tの反射光と透過光を撮影するように構成できれば、布片シワ伸ばし装置以外の他の装置と一体とすることも可能である。装置全体の大きさや処理効率等から最適な布片検査装置の配置を選択することができる。
特許請求の範囲に記載の検査台とは単一のものに限られず、暗色部と透明部とで複数に分離したものも含む概念である。
なお、黒色部21は黒色に代えて灰色など他の色としてもよく、透明部22は透明に代えて乳白色などの光が透過する材質としてもよい。
第1検査カメラ41は黒色部21上に撮像位置があり、第2検査カメラ42は透明部22上に撮像位置がある。
20 検査台
21 黒色部
22 透明部
41 第1検査カメラ
42 第2検査カメラ
51,52,53,54,55 光源
60 鏡
Claims (5)
- 布片の反射光を撮影する第1検査カメラと、
前記布片の透過光を撮影する第2検査カメラとを備える
ことを特徴とする布片検査装置。 - 前記第1検査カメラは前記布片表面の反射光を撮影し、
前記第2検査カメラは前記布片裏面の反射光も撮影するものである
ことを特徴とする請求項1記載の布片検査装置。 - 前記布片が通過する検査台を備え、
該検査台は暗色部と透光部とを有し、
前記第1検査カメラは前記暗色部を通過する布片を撮影し、
前記第2検査カメラは前記透光部を通過する布片を撮影するものである
ことを特徴とする請求項1または2記載の布片検査装置。 - 前記布片が供給される第1コンベアと、該第1コンベアに接続する第2コンベアとを備え、
前記検査台は前記第1コンベアと前記第2コンベアとの間に位置し、
前記検査台の前記第2コンベア側の縁部が、前記第1コンベアの後端と前記第2コンベアの前端とを結ぶ線より突出しており、
前記第1コンベアに比べて前記第2コンベアの方が速度が速い
ことを特徴とする請求項3記載の布片検査装置。 - 布片の反射光を撮影し、
前記布片の透過光を撮影し、
前記布片の同位置において反射光と透過光が共に周囲よりも暗い部分を汚れと判断し、
前記布片の同位置において反射光は周囲よりも暗く、透過光は周囲よりも明るい部分を破れと判断する
ことを特徴とする布片検査方法。
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