WO2001019714A1 - Verfahren und vorrichtung zur optischen kontrolle einer oberfläche einer fadenspule - Google Patents
Verfahren und vorrichtung zur optischen kontrolle einer oberfläche einer fadenspule Download PDFInfo
- Publication number
- WO2001019714A1 WO2001019714A1 PCT/EP2000/008997 EP0008997W WO0119714A1 WO 2001019714 A1 WO2001019714 A1 WO 2001019714A1 EP 0008997 W EP0008997 W EP 0008997W WO 0119714 A1 WO0119714 A1 WO 0119714A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensor
- plane
- reflex
- evaluated
- reflection
- Prior art date
Links
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
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/952—Inspecting the exterior surface of cylindrical bodies or wires
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
- B65H63/006—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package quality control of the package
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/30—Handled filamentary material
- B65H2701/31—Textiles threads or artificial strands of filaments
Definitions
- the invention relates to a method for optically checking a surface of a thread spool as well as a device for carrying out the method according to the preamble of claim 8.
- a surface of a thread spool is scanned by a light signal.
- the reflection signals caused on the surface by the light signal are projected onto a sensor.
- the projected reflection signals are evaluated by comparing the position and distance coordinates of the measuring points to an altitude of the surface.
- This method has proven itself for checking the topography of the surface of a thread spool, for example to find thread strippers on the end faces of the spools. Sections of thread are referred to as strikers which have come off the end of the spool assembly when the spool is being wound up.
- filament breaks can occur when winding up a thread consisting of a large number of individual filaments, which also represent a measure of the quality of the wound thread. Since synthetic threads are formed from a multiplicity of individual strand-like filaments, a filament break becomes noticeable in that a single filament protrudes from the thread composite. Such protruding filaments also appear when the thread is wound on the surfaces of the bobbin. Due to the very small diameter of the filaments in relation to the thread, protruding can be Do not correctly identify filaments on the surface of a thread spool by measuring the topography.
- the invention is therefore based on the object of developing the method of the type mentioned at the outset and an apparatus for carrying out the method in such a way that during the optical inspection a surface of a thread spool is to detect the protruding filaments due to filament breaks and to evaluate them as a quality feature of the thread spool.
- the invention is achieved by a method with the features according to claim 1 and by an apparatus for carrying out the method with the features according to claim 8.
- the main reflex is separated as a reflection signal from a plane of the surface (surface plane) and the secondary reflex as a reflection signal from an adjacent plane (distance plane).
- the main reflex is evaluated to determine the height of the surface and the secondary reflex to determine a light intensity. This clearly identifies the secondary reflections that appear as light flashes and evaluates them as filament breakage. All filament breaks in one plane are recorded.
- the distance plane and the surface plane each relate to the measuring point of the sensed surface, which is illuminated by the light signal.
- a minimum distance between the surface plane and the distance plane can thus be defined, so that the evaluation of the light intensity of the
- Secondary reflex is not affected by the light intensity of the main reflex.
- the main reflex and the secondary reflex are obtained from the diffusely reflected reflection signal.
- an optical system is arranged in the beam path of the diffusely reflected reflection signal, which separates the main reflex and the secondary reflex from one another.
- the method can thus be carried out independently of the beam path of the light signal, which leads to a high degree of flexibility when checking thread bobbins.
- the method can basically be carried out with one-dimensional sensors such as position-sensitive photodiodes (PSD) or with two-dimensional sensors such as area sensors (CCD).
- PSD position-sensitive photodiodes
- CCD area sensors
- the method variant according to claim 4 is proposed.
- the main reflex is projected from the optics onto one sensor and the secondary reflex onto a second sensor and evaluated separately.
- the sensors are aligned with the surface plane and the spacing plane, so that each filament in one plane is detected.
- the sensor that detects the main reflex is used to determine the height of the surface and the sensor that detects the secondary reflex to determine the filament breaks.
- the method variant according to claim 5 is advantageously used.
- the main reflex and the secondary reflex are projected together on one sensor.
- the light signal is generated by a laser according to a particularly advantageous method variant.
- the laser also has the advantage that there is a bundled light beam for scanning the surface.
- the secondary reflex is evaluated to determine an altitude. In this way, a predetermined minimum distance between the distance plane and the surface plane can be maintained at every measuring point on the surface.
- a device in which the reflection signal diffusely reflected from the surface is projected onto a sensor by optics.
- the lens system is designed in such a way that it reflects diffusely Reflection signal is separated into the main reflex and the secondary reflex. This makes it possible to use and evaluate both reflection signals to check the surface of the thread spool.
- two sensors are assigned to the optics, the main reflex being projected onto one of the sensors, which is designed, for example, as a PSD sensor, and the secondary reflex being projected onto the second sensor, which can be designed, for example, as a photodiode.
- This arrangement ensures the optical separation of two reflections, the filaments being detectable in the distance plane.
- the device can advantageously be developed in such a way that the light source is continuously readjusted depending on the height profile of the surface in order to be used for the at different altitudes To ensure the required distance between the surface plane and the distance plane. It is particularly advantageous here if the height profile of the surface to be sensed is recorded in a first measurement cycle and a controller is given, which specifies the adjustment of the light source for recording the filament breaks in the second measurement cycle.
- photodiodes are preferably used when two sensors are used.
- the useful signal is digitized and displayed in a graphic.
- the filament breaks appear as more or less large points of light. After evaluation using a size criterion, they are counted using a counting algorithm. This numerical information represents a measure of the quality of the surface of the filament coil. Practical testing has shown that individual, very fine filament breaks from 0.5 mm in length can be detected.
- a surface sensor - for example a CCD sensor or a diode sensor - is assigned to the optics, the main reflex and the secondary reflex being projected together onto the surface sensor.
- the CCD sensor maps the natural topography of the coil line by line.
- This line is shown curved on the sensor based on the height information.
- the vertical coordinate of the sensor represents the position of the measuring point and the horizontal coordinate the distance to the sensor.
- the separate light points appearing on the horizontal coordinate can thus be identified as filament breaks.
- a complete height profile of the sensed surface is first recorded. This height profile is shown as an image. Each point on the contour line lies on a surface plane. Separate light spots from a filament break are thus searched for for each point within a predetermined tolerance band.
- the tolerance band is defined by the minimum distance between the surface level and the distance level. This means that no evaluations of the light points are carried out in the space between the surface plane and the distance plane of a measuring point.
- the detection and evaluation of the light spots is carried out according to size criteria using a counting algorithm and leads to numerical information about the quality of the coil.
- two surface sensors are provided, one of the sensors being assigned in each case in the surface plane and the adjacent distance plane.
- the laser / sensor combination that is assigned to the surface plane forms a smaller beam angle between them than the laser / sensor combination of the distance plane.
- Fig. 1 shows schematically a first embodiment of the Invention
- a filament 18 protrudes from the surface 6 of the thread spool 5 due to a filament break.
- a light source 1 is arranged in a measuring plane which is essentially vertical to the surface 2.
- Two sensors 2 and 13 are arranged at a distance from the surface 6 in the measuring plane at a distance from the light source 1.
- the sensors 2 and 13 and the light source 1 form a triangle with a measuring point 19 on the surface 6.
- Optics 4 are arranged directly in front of sensors 2 and 13.
- the optics 4 consists of several lenses 3.1 and 3.2, which projects a reflection signal reflected by the surface 6 onto the sensors 2 and 13.
- Sensor 2 is connected to evaluation electronics 14.
- the sensor 13 is coupled to the evaluation electronics 15.
- a filament 18 protruding into the beam path of the light signal 7 and protruding from the surface 6 is also composed by the light signal 7.
- the light signal 7 strikes the filament 18 in a spacing plane 12.
- the measuring point 19 on the surface 6 is located in a surface plane 11.
- the surface plane 11 and the spacing plane 12 are separated from one another by a distance A.
- the light signal 7 is reflected at the measuring point 19 on the surface 6 and on the filament 18. This creates diffuse reflection signals on the surface 6 and on the filament 18.
- the reflection signal emanating from the measuring point 19 is referred to here as the main reflex 10.
- the reflex emanating from the filament 18 is referred to as a secondary reflex 9.
- the optics 4 are arranged such that the diffusely reflected light signals of the main reflex and the secondary reflex are received by the optics 4.
- the main reflex and the secondary reflex are separated by the lens system in the optics 4 and then projected onto the sensors 2 and 13.
- the sensor 2 which is designed, for example, as a PSD sensor, receives the main reflex 10, which is then evaluated via the evaluation electronics 14 to a height of the measuring point 19.
- the secondary reflex 9 is projected via the optics 4 onto the sensor 13, which evaluates the light intensity 15 by means of the evaluation electronics 15. Since a secondary reflex 9 can only occur if a filament 18 is hit by the light signal 7 in the spacing plane 12, a light intensity is only registered if a filament is present. A light / dark image can thus be produced by a photodiode as sensor 13, in which the light spots can be identified directly as filament breaks.
- the device shown in FIG. 1 depends on the distance A between the surface plane 11 and the distance plane 12 being maintained. At the
- any flat in the coil can be measured Detect the filament break located at distance 12.
- the device shown in FIG. 1 is advantageously supplemented with the device parts shown in broken lines.
- the altitude of the measuring point 9 is fed to a controller 20 via the evaluation electronics 14.
- a zero position which characterizes the surface plane 11 is stored in the controller 20.
- the controller 20 will generate a signal which is given to an actuator 21.
- the actuator 21 is coupled to the light source 1 and causes a change in the angle of incidence of the light signal 7.
- FIG. 2 shows a further exemplary embodiment of a device according to the invention for carrying out the method for the optical control of a
- the device is with its light source
- the lens system of the optics 4 is set such that both reflection signals (the main reflex 10 and the secondary reflex 9) are projected onto a sensor 16 together.
- the 16 is designed as a surface sensor, for example as a matrix-shaped CCD sensor, which consists of many individual flat CCD elements arranged next to and above one another.
- the sensor 16 is connected to the evaluation electronics 17.
- the light signal 7 is generated by the light source 1, preferably a laser.
- the light signal 7 strikes the filament 18 in the distance plane 12 and the measuring point 19 of the surface 6 in the surface plane 11. From the surface 6 in the measuring point 19 and from the filament 18, the diffusely reflected signals are reflected beam path reflected and recorded by the optics 4.
- the optics 4 has a plurality of lenses 3.3 and 3.4 which are combined to form a lens system. The number of lenses is given here as an example.
- the optics 4 can also consist of three, four or five lenses.
- the lens system of the optics 4 must be set such that the main reflex 10 and the secondary reflex 9 are separated and projected together onto the surface sensor 16.
- the height information of the coil is shown in a line shape on the surface sensor.
- the reflection signals from a measuring point at which a separate secondary reflection occurs can thus be represented as points on a line.
- the surface is divided into numerous measuring points, which are measured one after the other. This results in a height per fill line, which is shown diagrammatically in the evaluation electronics 17 as an example.
- the light spots depicted in the vicinity of the height profile set up evaluated secondary reflections 9, which were generated due to filament breaks.
- the received measurement signals are digitized and displayed in pictures.
- the filament breaks appear as more or less large light spots next to the contour line.
- the light spots are counted according to a counting algorithm and made available as numerical information for determining the quality of the coil.
- the distance between the surface plane 11 and the distance plane 12 is characterized by a minimum distance A mi .n.
- This minimum distance A jn is specified in order to obtain a clear separation between the light spot and the height profile during the evaluation. All secondary reflection signals reflected outside the planes due to filament breaks can be detected. The area depends solely on the intensity of the registered light spots.
- FIG. 3 shows a further exemplary embodiment of a device according to the invention for carrying out the method for the optical control of a Surface of a bobbin shown.
- the device has two laser sensor combinations, each of which is arranged with a measuring point 19 on the surface 6 of the thread spool 5 to form a triangle.
- the laser sensor combination with the laser 1 and the sensor 16 is provided for detecting the filament breaks on the surface 6 of the thread spool 5.
- This arrangement is constructed in accordance with the device shown in FIG. 2. In this respect, reference is made to the preceding description.
- the laser sensor combination with the laser 1 and the sensor 2 is provided exclusively for detecting the height profile of the surface 6 of the thread spool 5.
- the device thus has only one laser 1, which projects a light signal 7 onto the surface 6 of the bobbin 5.
- the reflection signal 8 generated on the surface 6 in the measuring point 19 is projected from the lens 3 onto the sensor 2.
- a form is formed between the light signal 7 and the reflection signal 8
- the beam angle ⁇ l is in the range from 15 ° to 45 °.
- the sensor 2 is connected to the evaluation electronics 14. In the
- the evaluation electronics 14 evaluate the recorded reflection signals 8 to a height of the surface of the thread spool or, in the case of several measurements, to a height profile of the surface 6 of the thread spool 5.
- the arrangement is particularly suitable for capturing the geometry of the surface with high optical resolution.
- the reflection signals of the light signal 7 which are brought about in the same measuring point 19 are recorded by the optics 4.
- a filament 18 detected by the light signal 7 could be measured at the same time.
- the main reflex 10 and secondary reflex 9 generated in the measuring point 19 of the surface 6 and a filament 18 are recorded by the optics 4 and projected onto the surface sensor 16.
- the area sensor 16 is coupled to the evaluation electronics 17, which the signals with respect to a Analyzes filament breakage. In this case, between the
- Beam angle ⁇ 2 is larger than the beam angle ⁇ l and is in the range from 70 ° to 120 °. It is thereby achieved that the reflection signals generated by a filament 18 and by the surface 6 are at a sufficiently large distance to separate and evaluate the reflection signals separately.
- the method according to the invention is particularly suitable for detecting the finest filament breaks, lint and loops with the smallest length. It can hereby filaments having a Filamentquerschmtt of 2 ⁇ m unc j e j ner Len gth of about 0.5 mm can be detected.
- the method is an advantageous addition to determine all the errors that occur during the bobbin inspection and thus to assign them as quality parameters to the thread bobbin being checked in each case.
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- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0900300A AT411110B (de) | 1999-09-15 | 2000-09-14 | Verfahren und vorrichtung zur optischen kontrolle einer oberfläche einer fadenspule |
DE10082757T DE10082757D2 (de) | 1999-09-15 | 2000-09-14 | Verfahren und Vorrichtung zur optischen Kontrolle einer Oberfläche einer Fadenspule |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19944230.4 | 1999-09-15 | ||
DE19944230 | 1999-09-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001019714A1 true WO2001019714A1 (de) | 2001-03-22 |
Family
ID=7922131
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2000/008997 WO2001019714A1 (de) | 1999-09-15 | 2000-09-14 | Verfahren und vorrichtung zur optischen kontrolle einer oberfläche einer fadenspule |
Country Status (3)
Country | Link |
---|---|
AT (1) | AT411110B (de) |
DE (1) | DE10082757D2 (de) |
WO (1) | WO2001019714A1 (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007058790A1 (en) * | 2005-11-10 | 2007-05-24 | Eastman Kodak Company | Roll sidewall quality |
CN103482420A (zh) * | 2013-08-19 | 2014-01-01 | 苏州三和开泰花线织造有限公司 | 一种带丝线检测功能的络丝机 |
CN106093052A (zh) * | 2016-06-03 | 2016-11-09 | 南京航空航天大学 | 一种断纱检测方法 |
CN109959406A (zh) * | 2019-04-17 | 2019-07-02 | 福州大学 | 轮式旋转悬臂水下桥墩检测装置及其工作方法 |
CN113584652A (zh) * | 2021-08-09 | 2021-11-02 | 杨峰 | 一种并条机自动化作业***及方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61119731A (ja) * | 1984-11-14 | 1986-06-06 | Murata Mach Ltd | 巻糸パツケ−ジの巻形検査方法 |
DE3630668A1 (de) * | 1985-09-10 | 1987-04-23 | Murata Machinery Ltd | Aufspulform-pruefvorrichtung fuer bewickelte fadenspulen |
JPH051998A (ja) * | 1991-06-27 | 1993-01-08 | Fuji Electric Co Ltd | 毛羽検出装置 |
DE4323546A1 (de) * | 1992-07-14 | 1994-01-27 | Murata Machinery Ltd | Spulenprüfvorrichtung |
EP0693451A1 (de) * | 1994-07-11 | 1996-01-24 | B a r m a g AG | Verfahren zur optischen Vermessung der Spulenoberfläche von Fadenspulen |
-
2000
- 2000-09-14 DE DE10082757T patent/DE10082757D2/de not_active Expired - Fee Related
- 2000-09-14 AT AT0900300A patent/AT411110B/de not_active IP Right Cessation
- 2000-09-14 WO PCT/EP2000/008997 patent/WO2001019714A1/de active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61119731A (ja) * | 1984-11-14 | 1986-06-06 | Murata Mach Ltd | 巻糸パツケ−ジの巻形検査方法 |
DE3630668A1 (de) * | 1985-09-10 | 1987-04-23 | Murata Machinery Ltd | Aufspulform-pruefvorrichtung fuer bewickelte fadenspulen |
JPH051998A (ja) * | 1991-06-27 | 1993-01-08 | Fuji Electric Co Ltd | 毛羽検出装置 |
DE4323546A1 (de) * | 1992-07-14 | 1994-01-27 | Murata Machinery Ltd | Spulenprüfvorrichtung |
EP0693451A1 (de) * | 1994-07-11 | 1996-01-24 | B a r m a g AG | Verfahren zur optischen Vermessung der Spulenoberfläche von Fadenspulen |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 010, no. 310 (C - 379) 22 October 1986 (1986-10-22) * |
PATENT ABSTRACTS OF JAPAN vol. 017, no. 258 (P - 1540) 20 May 1993 (1993-05-20) * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007058790A1 (en) * | 2005-11-10 | 2007-05-24 | Eastman Kodak Company | Roll sidewall quality |
CN103482420A (zh) * | 2013-08-19 | 2014-01-01 | 苏州三和开泰花线织造有限公司 | 一种带丝线检测功能的络丝机 |
CN103482420B (zh) * | 2013-08-19 | 2018-11-13 | 苏州三和开泰花线织造有限公司 | 一种带丝线检测功能的络丝机 |
CN106093052A (zh) * | 2016-06-03 | 2016-11-09 | 南京航空航天大学 | 一种断纱检测方法 |
CN109959406A (zh) * | 2019-04-17 | 2019-07-02 | 福州大学 | 轮式旋转悬臂水下桥墩检测装置及其工作方法 |
CN109959406B (zh) * | 2019-04-17 | 2024-02-02 | 福州大学 | 轮式旋转悬臂水下桥墩检测装置及其工作方法 |
CN113584652A (zh) * | 2021-08-09 | 2021-11-02 | 杨峰 | 一种并条机自动化作业***及方法 |
Also Published As
Publication number | Publication date |
---|---|
DE10082757D2 (de) | 2002-02-28 |
ATA90032000A (de) | 2003-02-15 |
AT411110B (de) | 2003-09-25 |
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