EP1795478B1 - Textile machine - Google Patents
Textile machine Download PDFInfo
- Publication number
- EP1795478B1 EP1795478B1 EP06024231A EP06024231A EP1795478B1 EP 1795478 B1 EP1795478 B1 EP 1795478B1 EP 06024231 A EP06024231 A EP 06024231A EP 06024231 A EP06024231 A EP 06024231A EP 1795478 B1 EP1795478 B1 EP 1795478B1
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- European Patent Office
- Prior art keywords
- yarn
- thickness
- speed
- defect
- detecting device
- Prior art date
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- 239000004753 textile Substances 0.000 title claims description 8
- 230000007547 defect Effects 0.000 claims description 162
- 238000004804 winding Methods 0.000 claims description 130
- 230000000052 comparative effect Effects 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 7
- 239000008186 active pharmaceutical agent Substances 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 description 51
- 238000001514 detection method Methods 0.000 description 9
- 206010052428 Wound Diseases 0.000 description 7
- 208000027418 Wounds and injury Diseases 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 235000013351 cheese Nutrition 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000004018 waxing Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H61/00—Applications of devices for metering predetermined lengths of running material
- B65H61/005—Applications of devices for metering predetermined lengths of running material for measuring speed of running yarns
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- 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
- B65H63/06—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to presence of irregularities in running material, e.g. for severing the material at irregularities ; Control of the correct working of the yarn cleaner
- B65H63/062—Electronic slub detector
-
- 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
- This winder like the winder disclosed in the Unexamined Japanese Patent Application Publication (Tokkai-Hei) No. 62-255366 , uses a traverse drum to wind a yarn into a package.
- the rotation speed of the traverse drum is kept fixed except for the start of driving, when the speed is increased, and the end of driving, when the speed is decreased.
- the line (b) in Figure 4 shows the peripheral speed of the traverse drum instead of its rotation speed. This is because the peripheral speed of the traverse drum corresponds to the yarn speed.
- the yarn speed sensor 7 is a device that detects the traveling speed (yarn speed) of the yarn 3 in a non-contact manner.
- the yarn defect detecting device 8 comprises a yarn thickness detecting device 81 that detects the yarn thickness of the passing yarn 3, a yarn defect determining device 82 that determines whether or not the yarn thickness corresponds to a yarn defect, and a yarn cutting device 83 that cuts the yarn 3 when the yarn thickness is determined to correspond to a yarn defect.
- the yarn splicing device 9 splices a lower yarn of the supplying package 2 side and an upper yarn of the winding package 4.
- the yarn 3 is separated into an upper yarn and a lower yarn.
- the yarn splicing device 9 carries out splicing to resume rewinding the yarn around the winding package 4.
- the yarn defect determining device 82 transmits a yarn splicing instruction signal to the yarn splicing device 9 via the sequencer 12 in order to actuate the yarn splicing device 9.
- the function serving as traverse means is implemented by a groove (traverse groove) 10a which is formed in the outer peripheral surface of the traverse drum 10 and through which the yarn 3 is guided.
- This groove is formed so as to be displaced in the axial direction of the traverse drum 10 along its circumferential direction.
- the yarn 3 guided through the groove 10a is swung in the axial direction of the traverse drum 10 in conjunction with rotation of the traverse drum 10.
- a line (b) in Figure 4 shows the relationship between the traveling speed (yarn speed) of the yarn 3 and the winding diameter.
- the traverse average value of the yarn speed is indicated by a thick broken line.
- the upper and lower limits of instantaneous value of yarn speed, which varies across the average value, are indicated by thin broken lines.
- the instantaneous value of the yarn speed varies at a traverse period under the effect of traversing. This is because during traversing, the yarn 3 is swung in the axial direction of the winding package 4 to vary the path length of the yarn 3 extending from the traverse drum 10 to the winding package 4, thus expanding or contracting the yarn 3.
- the winding diameter of the winding package 4 increases as the time passes. Accordingly, the axis of abscissa in Figure 4 is generally a time axis.
- the traverse drum 10 has a fixed peripheral speed. Further, as previously described, the traverse drum 10 and the winding package 4 are in contact with each other substantially only at the driving point P.
- the fixed peripheral speed is applied to the winding package 4 at the driving point P.
- the driving point P moves toward the larger diameter side of the winding package 4 with the peripheral speed of the traverse drum 10 fixed, the outer peripheral length of the winding package 4 increases at the driving point P. This increases the time required to allow the winding package 4 to make one rotation. In other words, the displacement of the driving point P toward the larger diameter side decreases the rotation speed of the winding package 4.
- an increase in winding diameter itself uniformly increases the outer peripheral length of the winding package 4.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Quality & Reliability (AREA)
- Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
- Treatment Of Fiber Materials (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Spinning Or Twisting Of Yarns (AREA)
Description
- The present invention relates to a textile machine according to the preamble of
claim 1. - In the prior art, textile machines such as a winder (winding machine) for a spun yarn comprise a yarn defect detecting device that detects and eliminates yarn defects which are included in a yarn. Examples of the yarn defect detecting device include a photoelectric sensor that detects yarn thickness on the basis of an image of a yarn obtained by light irradiation, and a capacitance sensor that passes a yarn through electric fields to detect the capacitance of passing cross section of the yarn to determine the yarn thickness.
- The yarn defect refers to the abnormal thickness of a yarn and includes a nep or slab in which the yarn forms a mass over a portion of about several millimeters, and too thick or thin a yarn having a yarn thickness different from the average one over a portion of several centimeters or more. Determination criteria are set according to the yarn defect level such as a nep or slab.
- For example, where a yarn thickness equal to at least 150% of the average one extends at least 3 mm, the yarn is determined to have a slab. In this case, even when the yarn thickness detected by the yarn defect detecting device is at least 150% of the average one, where the defective portion extends less than 3 mm, the yarn is not determined to have a slab.
- The determination of a yarn defect requires yarn length information. The yarn length is equal to yarn traveling speed multiplied by time. Thus, information on the yarn traveling speed is to be provided to a yarn defect detecting device not having means for directly detecting the yarn length so that the yarn defect detecting device can calculate the length of a yarn defect portion having passed through the device.
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EP-A-1 521 085 andEP-A2-1 249 422 disclose a device according to the preamble ofclaim 1 for contactless determining the speed of a running yarn and for determining the thickness of the yarn. Yarn thickness defects are evaluated according to predetermined cleaning limits by a quality matrix. -
EP-A-1 553 037 discloses a winding device of a spun yarn to measure the yarn length of a package as accurately as possible to be able to produce packages having the same yarn length. Measuring of the yarn length is accomplished by a spatial filter type speed detector. - To use the spatial filter method for determining the speed of a running yarn is also known from
DE 199 00 581 A . -
US 5 592 849 A1 discloses a yarn unevenness information analyzing apparatus which can perform an analysis of periodic yarn unevenness. - The Unexamined
Japanese Patent Application Publication Tokkai-Hei) No. 62-255366 -
Figure 4 shows the relationship between the peripheral speed (rotation speed) of a traverse drum and winding diameter (line (a)) and the relationship between the yarn speed and package winding diameter (line (b)) in connection with winding of cone winding packages carried out by a winder. - This winder, like the winder disclosed in the Unexamined Japanese Patent Application Publication (Tokkai-Hei)
No. 62-255366 Figure 4 shows the peripheral speed of the traverse drum instead of its rotation speed. This is because the peripheral speed of the traverse drum corresponds to the yarn speed. - However, for cone (truncated cone-like cylinder) winding packages, the yarn speed of the yarn being wound into a package is not always equal to the peripheral speed of the traverse drum. The yarn speed decreases gradually with increasing package winding diameter.
- A variation in yarn speed is caused by the displacement of a substantial contact point (driving point) between a cone winding package and the traverse drum toward a larger diameter side, which displacement occurs in keeping with increasing winding diameter of the cone winding package. The rotation speed of the traverse drum is applied to the package at the driving point. Consequently, the driving point is displaced in the axial direction of the package. Thus, even with the fixed rotation speed of the traverse drum, the rotation speed of the package varies to vary the yarn speed of the yarn being wound into a package. The displacement of the driving point toward the larger diameter side is caused by the movement of center of gravity of the package toward the larger diameter side, which movement occurs in keeping with increasing winding diameter.
- The mismatch between the drum rotation speed and the yarn speed is not limited to winders forming cone winding packages. Where wax is applied to the yarn that is to be wound into a cheese winding package, the yarn speed may be varied by slippage of the yarn in spite of the fixed drum rotation speed.
- As described above, the yarn speed (drum peripheral speed) determined from the drum rotation speed may deviate from the actual one. Where the drum peripheral speed is different from the actual yarn speed, the yarn defect detecting device cannot appropriately determine the yarn length.
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Figure 4 shows areas RA, RB in which the peripheral speed of thetraverse drum 10 deviates from the actual yarn speed. In the area RA, in which the actual yarn speed is higher than the peripheral speed of thetraverse drum 10, the yarn defect detecting device is too insensitive. In this case, the yarn defect detecting device may obtain a yarn length smaller than the actual one; the yarn defect detecting device may not determine that 3 mm of yarn has passed until 5 mm of yarn has passed. A determination criterion for a yarn defect is set for a yarn thickness (average yarn thickness) determined to correspond to the yarn defect and the length of a yarn defect portion. For example, the presence of a slab is determined where a portion with a yarn thickness equal to at least 150% of a reference value extends at least 3 mm. Then, the yarn defect detecting device determines a 3 mm slab to be a 1.8 mm (5/3 mm) abnormal-thickness portion; the yarn defect detecting device may fail to determine it to be a slab. In other words, a portion to be determined to be a yarn defect may be overlooked by the yarn defect detecting device. - On the contrary, in the area RB, in which the actual yarn speed is lower than the peripheral speed of the
traverse drum 10, the yarn defect detecting device is too sensitive. Specifically, the yarn defect detecting device may obtain a yarn length larger than the actual one; the yarn defect detecting device may erroneously determine that 7 mm of yarn has passed though 5 mm of yarn has actually passed. This causes the yarn length of the yarn defect portion to be recognized to correspond to a yarn defect more serious than the actual one. In other words, the yarn defect detecting device may recognize a portion not to be determined to be a yarn defect as a yarn defect. - That is, the problem to be solved is that when the textile machine eliminating yarn defects in a traveling yarn is configured to determine the yarn speed by utilizing the speed such as the drum rotation speed which is not proportional to the real yarn speed, it may obtain a yarn speed that deviates from the actual one, so that when determining the yarn length on the basis of this yarn speed information, the yarn defect detecting device may erroneously determine for a yarn defect.
- This problem is solved by the textile machine according to
claim 1. - The above configuration has the following advantage.
- The yarn length information required for the yarn defect detecting device can be accurately calculated on the basis of the time information obtained by the yarn defect detecting device and the yarn speed transmitted by the yarn speed detecting device.
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Claim 2 provides the textile machine according toclaim 1, wherein the yarn speed detecting device utilizes a variation in the yarn thickness of the yarn to detect the moving speed of varying portion of the yarn by means of a spatial filter method to determine the moving speed of the varying portion to be the detected value of the yarn speed. - The present invention exerts the following effects.
- According to
claim 1, even with a change in yarn speed, the yarn defect detecting device does not determine the value deviating from the actual yarn speed to be the correct yarn speed. This allows the yarn length to be accurately determined, preventing yarn defects from being erroneously determined for. -
Claim 2 not only exerts the same effect ofclaim 1 but also prevents the yarn from being subjected to a load in detecting the yarn speed. -
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Figure 1 is a diagram showing the configuration of a winding unit. -
Figure 2 is a diagram showing the configuration of a yarn defect detecting device. -
Figure 3 is a graph showing yarn thickness length varying data. -
Figure 4 is a graph showing the relationship between a drum and winding diameter (a) and the relationship between yarn speed and the winding diameter (b) which relationships are observed where the rotation speed of the drum is controlled to a fixed value. - An automatic winder will be described with reference to
Figure 1 . - This automatic winder is a device that rewinds a yarn from a supplying
package 2 produced by a spinning machine or the like to form a windingpackage 4 of a predetermined shape. The automatic winder comprises a large number of windingunits 1 each responsible for rewinding. - As shown in
Figure 1 , the supplyingpackage 2 is placed at the bottom of the windingunit 1, and a windingpackage 4 is placed at the top of the windingunit 1. The windingunit 1 has anunwinding assisting device 5, avariable tension device 6, a yarn splicing device 9, ayarn speed sensor 7, a yarndefect detecting device 8, and atraverse drum 10 arranged along a route for a yarn 3 which extends from the supplyingpackage 2 to the windingpackage 4. - The winding
unit 1 also comprises adrum driver 11 that rotationally drives thetraverse drum 10, anencoder 16 that detects the rotation speed of thetraverse drum 10, and asequencer 12 that instructs thedrum driver 11 to control rotational driving of thetraverse drum 10. - The unwinding assisting
device 5 controls an unwinding balloon that is generated when the yarn 3 is unwound from the supplyingpackage 2 in its axial direction. - The unwinding assisting
device 5 comprises an umbrella-shapedcylinder member 51 that covers abobbin 21 of the supplyingpackage 2, and adriving mechanism 52 that lowers thecylinder member 51 with a substantially fixed gap δ maintained between thecylinder member 51 and the chess portion of the supplyingpackage 2. Thecylinder member 51 is controlled to maintain a substantially fixed balloon diameter during unwinding, preventing an increase in balloon diameter in spite of progress of unwinding. - The
variable tension device 6 applies a variable winding tension to the yarn 3 being unwound from the supplyingpackage 2. - The
variable tension device 6 comprises fixedcomb teeth 61 andmovable comb teeth 62 alternately arranged opposite one another across the route for the yarn 3, and adriving mechanism 63 such as a solenoid which increases or decreases the amount of engagement between the sets of fixedcomb teeth 61 andmovable comb teeth 62. - In accordance with a control signal from the
sequencer 12, thevariable tension device 6 controls the amount of engagement of themovable comb teeth 62 with the fixedcomb teeth 61, that is, the degree of zigzag bend of the route. This make it possible to sequentially control the winding tension applied to the yarn 3. - The
yarn speed sensor 7 is a device that detects the traveling speed (yarn speed) of the yarn 3 in a non-contact manner. - According to the present embodiment, the
yarn speed sensor 7 utilizes a variation in yarn thickness to detect the moving speed of varying portion of the yarn by a spatial filter method, and theyarn speed sensor 7 then outputs the detected value. - More specifically, the
yarn speed sensor 7 comprises a plurality of optical yarn thickness detecting devices arranged along the yarn traveling direction. Theyarn speed sensor 7 detects the traveling speed of the yarn 3 using the spatial filter method on the basis of output signals from the yarn thickness detecting means, arranged at the different positions in the yarn traveling direction. - Each of the optical yarn thickness detecting devices comprises a light receiving element and a light source. The quality of light received by the light receiving element varies depending on the yarn thickness of the yarn 3 passing by the detection position of the yarn thickness detecting means. The yarn thickness detecting device then outputs an electric signal corresponding to the yarn thickness.
- In the present embodiment, the yarn 3 is a spun yarn. Thus, fluffs may vary the yarn thickness in the length direction of the yarn 3. A fluffy portion of the yarn 3 in its length direction has an apparently larger thickness. Further, in this portion, the yarn thickness varies from average value through larger value to average value. Detecting the moving speed of the yarn thickness varying portion by the spatial filter method allows the yarn speed to be detected. This is because the moving speed is equal to the yarn speed.
- To indirectly detect the yarn speed of the yarn 3, a roller (rotor) is placed so as to move in contact with and in conjunction with the yarn 3, and the rotation speed of the roller is then detected to determine the yarn speed. The yarn speed can be calculated from the rotation speed of the roller because it is proportional to the peripheral speed of the roller. In particular, the roller rotates in conjunction with traveling of the yarn 3 and in direct proportion to the yarn speed, the rotation speed of the roller accurately reflects information on the yarn speed.
- Where the roller in contact with the yarn 3 is used to indirectly detect the yarn speed, it is necessary to prevent possible slippage between the roller and the yarn 3. Thus, the roller for indirect yarn speed detection is placed on the route for the yarn 3 upstream of a waxing device (which applies wax) and an oiling device (which applies oil) in the yarn traveling direction.
- Upon detecting a yarn defect such as a slab on the yarn 3, the yarn
defect detecting device 8 cuts the yarn 3. - The yarn
defect detecting device 8 comprises a yarnthickness detecting device 81 that detects the yarn thickness of the passing yarn 3, a yarndefect determining device 82 that determines whether or not the yarn thickness corresponds to a yarn defect, and ayarn cutting device 83 that cuts the yarn 3 when the yarn thickness is determined to correspond to a yarn defect. - The yarn
thickness detecting device 81 and yarndefect determining device 82 will be described below in detail. During winding, the yarndefect determining device 82 determines for a yarn defect on the basis of information on the yarn thickness of the yarn 3 detected by the yarnthickness detecting device 81. When a yarn defect is detected, the yarndefect determining device 82 immediately instructs theyarn cutting device 83 to cut the yarn 3. This actuates theyarn cutting device 83, which forcibly cuts the yarn 3. - Simultaneously with the yarn cutting, a yarn traveling signal from the yarn
thickness detecting device 81 is turned off, and the yarndefect determining device 82 senses the yarn breakage. The yarndefect determining device 82 then transmits a stop signal for thetraverse drum 10 to thedrum driver 11 via thesequencer 12 to stop the rotation of thetraverse drum 10. - The yarn
thickness detecting device 81 provided in the yarndefect detecting device 8 is in principle similar to the yarn thickness detecting device provided in theyarn speed sensor 7, and the yarnthickness detecting device 81 thus comprises a light receiving element and a light source. The yarnthickness detecting device 81 outputs an electric signal corresponding to the yarn thickness. - The yarn splicing device 9 splices a lower yarn of the supplying
package 2 side and an upper yarn of the windingpackage 4. When a yarn breakage results from yarn cutting or the like carried out by yarndefect detecting device 8, the yarn 3 is separated into an upper yarn and a lower yarn. Thus, the yarn splicing device 9 carries out splicing to resume rewinding the yarn around the windingpackage 4. When the yarn traveling signal from the yarnthickness detecting device 81 is turned off, the yarndefect determining device 82 transmits a yarn splicing instruction signal to the yarn splicing device 9 via thesequencer 12 in order to actuate the yarn splicing device 9. - The yarn splicing device 9 comprises an air nozzle device 91 that uses an air current to entangle fibers of the upper yarn and lower yarn with one another for splicing, a lower
yarn sucking device 92 that sucks, catches, and guides the lower yarn to the air nozzle device 91, and an upperyarn sucking device 93 that sucks, catches, and guides the upper yarn to the air nozzle device 91. - The lower
yarn sucking device 92 comprises a main body composed of a suction pipe that sucks and catches the yarn 3, and asuction port 92a at the leading end of the suction pipe is pivotable around anaxis 92b at the trailing end of the suction pipe. Vertical pivoting of the suction pipe moves thesuction port 92a between the air nozzle device 91 and a position above the unwinding assistingdevice 5. The upperyarn sucking device 93 is similarly configured. The upperyarn sucking device 93 comprises a main body composed of a suction pipe that sucks and catches the yarn 3. Asuction port 93a at the leading end of the suction pipe is pivotable around anaxis 93b at the trailing end of the suction pipe. Vertical pivoting of the suction pipe moves thesuction port 93a between the air nozzle device 91 and a peripheral surface of the windingpackage 4. - When the yarn
defect detecting device 8 forcibly cuts the yarn 3 on the basis of detection of a yarn defect by the yarndefect detecting device 8, the upper yarn is wound around the windingpackage 4, and on the basis of the yarn splicing instruction signal, the lower yarn is caught by the loweryarn sucking device 92 having thesuction port 92a standing by above the unwinding assistingdevice 5. - Then, on the basis of the yarn splicing instruction signal, the upper yarn is caught by the upper
yarn sucking device 93 having thesuction port 93a standing by over the peripheral surface of the windingpackage 4. - The lower
yarn sucking device 92 subsequently moves thesuction port 92a upward to guide the lower yarn to the air nozzle device 91, and the upperyarn sucking device 93 moves thesuction port 93a downward to guide the upper yarn to the air nozzle device 91. The air nozzle device 91 splices the upper yarn and lower yarn together. - After the yarn splicing operation, the rotational driving of the
traverse drum 10 is resumed in accordance with an instruction from thesequencer 12, and winding is then carried out again. - The
traverse drum 10 is a device that transversely wounds the yarn 3 into the windingpackage 4. - More specifically, the
traverse drum 10 has a function (traverse means) for swinging the yarn 3 in the axial direction of the windingpackage 4 and a function (winding means) for rotating the windingpackage 4 to wind the yarn 3 on the windingpackage 4. - The function serving as winding means is implemented by forming the
traverse drum 10 into a cylindrical rotating member. Thetraverse drum 10 is placed so that its outer peripheral surface contacts with the outer peripheral surface of the windingpackage 4. In this state, rotation of thetraverse drum 10 rotates the windingpackage 4 in conjunction with thetraverse drum 10. - The function serving as traverse means is implemented by a groove (traverse groove) 10a which is formed in the outer peripheral surface of the
traverse drum 10 and through which the yarn 3 is guided. This groove is formed so as to be displaced in the axial direction of thetraverse drum 10 along its circumferential direction. The yarn 3 guided through thegroove 10a is swung in the axial direction of thetraverse drum 10 in conjunction with rotation of thetraverse drum 10. - The device that transversely wounds the yarn 3 into the winding
package 4 is not limited to thetraverse drum 10 integrally comprising the traverse means and winding means. The device serving as the traverse means may be separated from the device serving as the winding means. For example, the traverse means may be a device that swings the yarn guide in the axial direction of the windingpackage 4, whereas the winding means may be a simple cylindrical rotating member (drum) without any yarn guide groove. - Now, with reference to Table 1, a description will be given of determination criteria for yarn defects will be described.
- On data (yarn thickness time varying data DT described below) on the yarn thickness of the yarn 3 obtained in a time-oriented manner and the determination criteria for yarn defects shown in Table 1, the yarn
defect detecting device 8 determines whether or not there is a yarn defect on the yarn 3 passing by the detection position of the yarndefect detecting device 8.[Table 1] Corresponding thickness Monitored length Yarn defect level Nep At least Pn (200%) Ln (0mm) Slab At least Ps (150%) Ls (3mm) thick yarn At least Pl (110%) Ll (100cm) thin yarn At most Pt (90%) Lt (100cm) - As shown in Table 1, the determination criteria for yarn defects are classified according to the yarn defect level. The following are set for each yarn defect level: the length (monitored length) over which the yarn length is monitored and a thickness boundary value (corresponding thickness) at which the average yarn thickness within the monitored length is determined to correspond to a yarn defect. The thickness boundary value means a lower limit value at which the thickness is determined to a yarn defect in case of thick a yarn, a slab, or the like, or an upper limit value at which the thickness is determined to correspond to a yarn defect in case of thin a yarn.
- Each of the percentages (%) shown in the level column indicates the ratio of the thickness to the reference value (hereinafter referred to as a reference yarn thickness). The reference yarn thickness is such a value as obtained by averaging yarn thicknesses over a sufficiently long distance (for example, 100 m) and as considered to be the average of the yarn thickness over the entire yarn 3.
- For example, the determination criteria in Table 1 show that the yarn is determined to have a slab where the monitored length is 3 mm and where the average yarn thickness is at least 150% of the reference yarn thickness. Here, even if the yarn thickness is less than 150%, for example, 120%, of the reference value in any portion, the yarn 3 is determined to have a slab as long as the average yarn thickness exceeds 150% over the 3 mm portion. On the other hand, where the average yarn th i ckness is less than 150% within the 3 mm port i on, the yarn is not determined to have a slab.
- With reference to
Figure 2 , a detailed description will be given of configuration of the yarndefect detecting device 8 for detection of yarn defects. - The yarn
defect detecting device 8 requires yarn length information to determine for a yarn defect in accordance with the determination criteria (Table 1) set for the yarn thicknesses corresponding to the abnormal portions and the yarn lengths for the abnormal portions. The yarndefect detecting device 8 comprises no means for directly detecting the yarn length itself. Accordingly, the yarndefect detecting device 8 calculates the yarn length on the basis of time information obtained by the yarndefect detecting device 8 and information on the yarn speed transmitted by theyarn speed sensor 7, serving as an external device. - The yarn
defect detecting device 8 comprises the yarnthickness detecting device 81 and the yarndefect determining device 82. The yarndefect determining device 82 further comprises a yarnthickness storing section 82a, adata converting section 82b, a determinationcriteria storing section 82c, and a yarndefect determining section 82d. - The yarn
defect detecting device 8 converts yarn thickness time varying data DT obtained in a time-oriented manner into yarn thickness length varying data DL on the basis of the detected value of the yarn speed detected by theyarn speed sensor 7. The yarndefect determining device 8 then determines for a yarn defect on the basis of the yarn thickness length varying data DL. - The yarn thickness time varying data DT is created by the yarn
thickness storing section 82a by arranging instantaneous values of the yarn thickness in a time-oriented manner; the yarnthickness storing section 82a stores the instantaneous values of the yarn thickness detected by the yarnthickness detecting device 81. - The
data converting section 82b converts the yarn thickness time varying data DT into the yarn thickness length varying data DL on the basis of the detected value of the yarn speed detected by theyarn speed sensor 7, that is, utilizing the fact that the product of time and speed is distance. - The yarn
defect determining section 82d determines for a yarn defect on the basis of the yarn thickness length varying data DL and the determination criteria for the yarn defects. Information (yarn defect determination reference data DS) corresponding to the determination criteria for the yarn defects is stored in the determinationcriteria storing section 82c. - A further detailed description will be given of the process of determining for a yarn defect which process is executed by the yarn
defect detecting device 8. - First, while the yarn 3 is traveling, the yarn
thickness detecting device 81 constantly detects the instantaneous value of the yarn thickness and outputs the detected value (instantaneous value of the yarn thickness). - The instantaneous values of the yarn thickness output by the yarn
thickness detecting device 81 are stored in the yarnthickness storing section 82a in a time-oriented manner. The yarnthickness storing section 82a stores the yarn thickness time varying data DT as created, which comprises the instantaneous values of the yarn thickness arranged in a time-oriented manner. The yarn thickness time varying data DT in principle indicates the relationship between the detection continuation time having elapsed since the start of detection of the yarn 3 by the yarnthickness detecting device 81 and the yarn thickness varying depending on the detection continuation time. In the present embodiment, the origin of a time axis in the yarn thickness time varying data DT is not the detection continuation time but the time when the formation of a windingpackage 4 is started. - Then, the
data converting section 82b converts the yarn thickness time varying data DT into yarn thickness length varying data DL, which is then output. The yarn thickness length varying data DL in principle indicates the relationship between the yarn length over which the yarn 3 travels from the start of detecting of the yarn 3 by the yarnthickness detecting device 81 until the passage of the yarn 3 through the yarnthickness detecting device 81, and the yarn thickness varying depending on the yarn length. In the present embodiment, the yarn length in the yarn thickness length varying data DL is not the length of the yarn having passed through the yarnthickness detecting device 81 but the length of the yarn wound into the windingpackage 4. This conversion is possible because the distance from the yarnthickness detecting device 81 to the position where the yarn 3 is wound around the windingpackage 4 is clear owing to the configuration of the windingunit 1. - The
data converting section 82b converts the data DT into the data DL on the basis of the value of the yarn speed detected by theyarn speed sensor 7. The conversion utilizes the fact that the product of yarn speed and time is equal to distance (yarn length). - The determination
criteria storing section 82c pre-stores the data (yarn defect determination criteria data DS inFigure 2 ) corresponding to such determination criteria for the yarn defects as shown in Table 1. The setting contents (monitored lengths and corresponding lengths) in the yarn defect determination criteria data DS can be rewritten by operating an external input device connected to the yarndefect determining device 82. - Then, the yarn
defect determining section 82d determines for a yarn defect on the yarn 3 on the basis of the yarn thickness length varying data DL and the yarn defect determination criteria. - The yarn defect determination criteria include a plurality of yarn defect levels, and a monitored length and a thickness corresponding to the monitored length which are set for each of the yarn defect levels, as described above with reference to Table 1.
- Accordingly, the yarn
defect determining section 82d determines whether or not the average yarn thickness detected value (average yarn thickness) over each monitored length falls under the thickness corresponding to that monitored length, so as to enable the different levels of yarn defects to be simultaneously detected. This will be described below in detail. - Thus, the yarn
defect determining section 82d comprises an average yarn thickness calculating section 82dl that averages the yarn thickness detected values over the monitored length and a comparative determining section 82d2 that compares the average yarn thickness with the corresponding thickness to determine that a yarn defect has occurred where the average yarn thickness exceeds the corresponding thickness. - With reference to
Figure 3 , a detailed description will be given of the determination for a yarn defect executed by the yarndefect determining section 82d. -
Figure 3 shows the yarn thickness length varying data DL. The axis of ordinate corresponds to yarn thickness, and the axis of abscissa inFigure 3 corresponds to yarn length. The yarn length on the axis of abscissa corresponds to the entire length of the yarn 3 wound into the windingpackage 4 as previously described. - For the latest part of the yarn thickness length varying data DL, the average yarn thickness calculating section 82dl constantly averages the yarn thicknesses detected over the monitored length corresponding to each yarn defect level to calculate the average yarn thickness. Here, the latest part means that the part for which the time when the yarn 3 passes through the yarn
thickness detecting device 81 is latest. - For example, to determine for the presence of a slab, the average yarn thickness calculating section 82d1 constantly averages, for the latest part of the yarn thickness length varying data DL, the yarn thickness values detected over the monitored length Ls (for example, 3 mm) corresponding to a slab to calculate an average yarn thickness for determining slab As. The average yarn thickness for determining slab As is utilized by the comparative determining section 82d2 to determine a slab.
- To determine for the presence of a thick yarn, the average yarn thickness calculating section 82dl constantly averages, for the latest part of the yarn thickness length varying data DL, the yarn thickness values detected over the monitored length Ll (for example, 100 cm) corresponding to the thick yarn to calculate an average yarn thickness for determining thick yarn Al. The average yarn thickness for determining thick yarn Al is utilized by the comparative determining section 82d2 to determine for the thick yarn.
- For each yarn defect level such as a slab, the comparative determining section 82d2 compares the average yarn thickness calculated by the average yarn thickness calculating section 82dl with the thickness corresponding to that level. Where the average yarn thickness exceeds the corresponding thickness, the comparative determining section 82d2 determines that a yarn defect has occurred.
- For example, to determine for the presence of a slab, the comparative determining section 82d2 compares the average yarn thickness for determining slab As calculated by the average yarn thickness calculating section 82dl with a thickness Ps corresponding to a slab. Where the average yarn thickness for determining slab As exceeds the corresponding thickness Ps, the comparative determining section 82d2 determines that a slab has occurred. To determine for the presence of a nep, the comparative determining section 82d2 compares an average yarn thickness for determining nep An calculated by the average yarn thickness calculating section 82dl with a thickness Pn corresponding to a nep. Where the average yarn thickness for determining nep An exceeds the corresponding thickness Pn, the comparative determining section 82d2 determines that a nep has occurred. For a nep, the monitored length Ln corresponding to a nep is set at, for example, 0. Consequently, immediately after the yarn
thickness detecting device 81 detects a yarn thickness exceeding the corresponding thickness An, the comparative determining section 82d2 determines that a nep has occurred. - Upon determining that a yarn defect has occurred, the yarn defect determining device (comparative determining section 82d2) instructs the
yarn cutting device 83 to cut the traveling yarn 3. - Now, a description will be given of the relationship between the yarn speed and the rotation speed of the
traverse drum 10. - The rotation speed of the
traverse drum 10 is to be controlled by thesequencer 12. Accordingly, provided that the yarn speed can be correctly calculated on the basis of the rotation speed, theyarn speed sensor 7 need not detect the yarn speed. - However, where the yarn 3 is wound into the
cone winding package 4, there is a complicated relationship between the rotation speed of thetraverse drum 10 and the yarn speed of the yarn 3 in connection with the winding of the yarn 3. It is thus very difficult to correctly calculate the yarn speed on the basis of the rotation speed. - Thus, the
yarn speed sensor 7 that can appropriately detect the yarn speed can be effectively provided in each windingunit 1. - A description will be given of the actual relationship between the rotation speed of the
traverse drum 10 and the yarn speed. - With reference to
Figure 4 , a description will be given of a variation in yarn speed which occurs where the rotation speed of thetraverse drum 10 is fixed. - A line (a) in
Figure 4 shows the relationship between the peripheral speed of thetraverse drum 10 and the winding diameter. The peripheral speed Vd is indicated by a thick solid line. The peripheral speed Vd has a fixed value. - A line (b) in
Figure 4 shows the relationship between the traveling speed (yarn speed) of the yarn 3 and the winding diameter. The traverse average value of the yarn speed is indicated by a thick broken line. The upper and lower limits of instantaneous value of yarn speed, which varies across the average value, are indicated by thin broken lines. Here, the instantaneous value of the yarn speed varies at a traverse period under the effect of traversing. This is because during traversing, the yarn 3 is swung in the axial direction of the windingpackage 4 to vary the path length of the yarn 3 extending from thetraverse drum 10 to the windingpackage 4, thus expanding or contracting the yarn 3. - The
yarn speed sensor 7 detects the instantaneous value of the yarn speed. - In
Figure 4 , the axis of abscissa is a magnitude axis indicating the winding diameter of the windingpackage 4, and the axis of ordinate is a speed axis indicating the yarn speed or peripheral speed. - In the line (a) in
Figure 4 shows the peripheral speed of thetraverse drum 10 instead of its rotation speed. This is because the speed corresponding to the yarn speed is not the rotation speed of thetraverse drum 10 but its peripheral speed. This will be described below in further detail. The peripheral speed of thetraverse drum 10 is determined by the rotation speed of thetraverse drum 10 and its diameter. - Further, the winding diameter of the winding
package 4 increases as the time passes. Accordingly, the axis of abscissa inFigure 4 is generally a time axis. - As the line (a) shown in
Figure 4 , with the fixed peripheral speed (rotation speed) of thetraverse drum 10, the yarn speed decreases gradually with increasing winding diameter of the windingpackage 4 as the line (b) inFigure 4 . - In the present embodiment, the yarn speed is higher than the peripheral speed of the
traverse drum 10, which is fixed, at the beginning of winding (smaller winding diameter), and is lower than the peripheral speed of thetraverse drum 10 at the end of winding (larger winding diameter). - That is, the yarn speed varies depending on the winding diameter of the winding
package 4. - Now, factors determining the yarn speed will be described.
- The yarn speed is generally proportional to the rotation speed of the winding
package 4. This is because the yarn 3 is wound into the windingpackage 4 and thus pulled to travel on the yarn traveling path in the windingunit 1. The only driving means for running the yarn 3 is thetraverse drum 10, which rotates the windingpackage 4. - However, where the yarn 3 is wound into the
cone winding package 4, then with the fixed rotation speed of thetraverse drum 10, the displacement of a driving point P described below varies the rotation speed of the windingpackage 4. - First, the
cone winding package 4 will be described. - The
bobbin 13 for the windingpackage 4 is shaped like a cone (truncated cone-like cylinder). The yarn 3 is wound around an outer peripheral surface of thebobbin 13 while being traversed. This makes the winding diameter of the yarn 3 uniform in the axial direction of thebobbin 13. Thus, winding the yarn around thebobbin 13 results in thecone winding package 4. - The
bobbin 13 is supported by a cradle arm (not shown in the drawings) so that the outer peripheral surface of the winding package 4 (bobbin 13) is always in contact with the outer peripheral surface of thetraverse drum 10. The position where thebobbin 13 is supported by the cradle arm varies with increasing winding diameter of the windingpackage 4 formed on thebobbin 13. - Since the winding
package 4 andbobbin 13 are each shaped like a cone, thebobbin 13 is supported by the cradle arm so that the lower end of outer peripheral surface of the winding package 4 (bobbin 13) is parallel to the upperend of outer peripheral surface of thetraverse drum 10. This makes it possible to keep the entire lower end of outer peripheral surface of the winding package 4 (bobbin 13) in contact with the entire upper end of outer peripheral surface of thetraverse drum 10. In this case, thebobbin 13 is located above thetraverse drum 10. - The driving point P (substantial contact point between the winding
package 4 and the traverse drum 10) will be described. - While the
traverse drum 10 is stationary, the entire lower end of outer peripheral surface of the winding package 4 (bobbin 13) is in contact with the entire upper end of outer peripheral surface of thetraverse drum 10. In other words, the outer peripheral surfaces of the windingpackage 4 and traversedrum 10 are in line contact with each other. - In contrast, while the
traverse drum 10 is being rotationally driven, the outer peripheral surfaces of the windingpackage 4 and traversedrum 10 are substantially in point contact with each other at one point. The position of the point contact corresponds to the driving point P. That is, the winding package 4 (bobbin 13) is provided with the rotating force of thetraverse drum 10 only at the driving point P. - The winding package 4 (bobbin 13) is provided with the rotating force only at the driving point P for the following reason.
- Since the winding package 4 (bobbin 13) is conical, its outer peripheral length varies in its axial direction. On the other hand, the peripheral speed provided by the
traverse drum 10 is the same regardless of the axial position on the winding package 4 (bobbin 13). When the winding package 4 (bobbin 13) is provided with the same peripheral speed at its different axial positions, this means that the winding package 4 (bobbin 13) is provided with different rotation speeds owing to its varying outer peripheral length. Where the winding package 4 (bobbin 13) has a stable shape, it is impossible that the rotation speed of the windingpackage 4 varies at different axial positions. Consequently, the rotating force of thetraverse drum 10 is substantially transmitted to the winding package 4 (bobbin 13) only at one axial point (driving point P) on the winding package 4 (bobbin 13). - The driving point P serves as a balancing center position of the winding package 4 (bobbin 13) in contact with the
traverse drum 10. This balancing center position is determined by a position of the center of gravity of the winding package 4 (bobbin 13) and the magnitude of the supporting force exerted by the cradle arm that exerts to support the opposite axial ends of thebobbin 13. - The position of the center of gravity of the winding package 4 (bobbin 13) is displaced toward a larger diameter side in response to an increase in winding diameter resulting from the progress of winding of the yarn 3.
- Thus, the driving point P moves toward the larger diameter side of the winding
package 4 as the winding diameter of the windingpackage 4 increases, as shown by arrow A (Figure 1 ). - The rotation speed of the winding
package 4 decreases as the driving point P is displaced toward the larger diameter side in keeping with increasing winding diameter. The reason is as follows. - At a fixed rotation speed of the
traverse drum 10, thetraverse drum 10 has a fixed peripheral speed. Further, as previously described, thetraverse drum 10 and the windingpackage 4 are in contact with each other substantially only at the driving point P. The fixed peripheral speed is applied to the windingpackage 4 at the driving point P. When the driving point P moves toward the larger diameter side of the windingpackage 4 with the peripheral speed of thetraverse drum 10 fixed, the outer peripheral length of the windingpackage 4 increases at the driving point P. This increases the time required to allow the windingpackage 4 to make one rotation. In other words, the displacement of the driving point P toward the larger diameter side decreases the rotation speed of the windingpackage 4. Moreover, an increase in winding diameter itself uniformly increases the outer peripheral length of the windingpackage 4. - Thus, with an increase in the winding diameter of the winding
package 4, the displacement of the driving point P toward the larger diameter side and the increase in winding diameter itself are combined with the increase in outer peripheral length to contribute to decreasing the rotation speed of the windingpackage 4. The line (b) inFigure 4 reflects this situation. - As described above, the yarn speed (drum peripheral speed) determined from the rotation speed of the
traverse drum 10 may deviate from the actual one. Where the drum peripheral speed is different from the actual yarn speed, the yarn defect detecting device cannot appropriately determine the yarn length. -
Figure 4 shows areas RA, RB in which the peripheral speed of thetraverse drum 10 deviates from the actual yarn speed. In the area RA, in which the actual yarn speed is higher than the peripheral speed of thetraverse drum 10, the yarn defect detecting device is too insensitive. In this case, the yarndefect detecting device 8 may obtain a yarn length smaller than the actual one; the yarndefect detecting device 8 may not determine that 3 mm of yarn has passed until 5 mm of yarn has passed. The determination criterion for a yarn defect is set for the yarn thickness (average yarn thickness) determined to correspond to the yarn defect and the length of the yarn defect portion. For example, the presence of a slab is determined when a portion with a yarn thickness equal to at least 150% of a reference value extends at least 3 mm. Then, the yarndefect detecting device 8 determines a 3 mm slab to be a 1.8 mm (5/3 mm) abnormal-thickness portion; the yarndefect detecting device 8 may fail to determine it to be a slab. In other words, a portion to be determined to be a yarn defect may be overlooked by the yarndefect detecting device 8. - On the contrary, in the area RB, in which the actual yarn speed is lower than the peripheral speed of the
traverse drum 10, the yarndefect detecting device 8 is too sensitive. Specifically, the yarndefect detecting device 8 may obtain a yarn length larger than the actual one; the yarndefect detecting device 8 may erroneously determine that 7 mm of yarn has passed though 5 mm of yarn has actually passed. This causes the yarn length of the yarn defect portion to be recognized to correspond to a yarn defect more serious than the actual one. In other words, the yarndefect detecting device 8 may determine the portion which should not be determined as a yarn defect to be a yarn defect. - As described above, the yarn
defect detecting device 8 obtains yarn length information (yarn thickness length varying data DL) on the basis of the yarn speed detected by theyarn speed sensor 7, which serves as a yarn speed detecting device. - Thus, even with a change in yarn speed, the yarn
defect detecting device 8 does not determine the value deviating from the actual yarn speed to be the correct yarn speed. This allows the yarn length to be accurately determined, preventing yarn defects from being erroneously determined for. - In traversing, the yarn speed varies depending on the traverse period. However, this variation in yarn speed can be sensed by the
yarn speed sensor 7, which detects the instantaneous value of the yarn speed. Thus, the yarn thickness length varying data DL reflects the variation in yarn speed caused by traversing; the yarn thickness length varying data DL is obtained by converting the yarn thickness time varying data DT on the basis of the yarn speed. - Where the corresponding length in the yarn defect determination criteria is shorter than the length required for one winding of the winding
package 4, the variation in yarn speed caused by traversing affects the yarn defect determination. For example, it is assumed that the length Ls corresponding to a slab is 3 mm and that the length required for one winding of the winding package 4 (length over which the yarn travels during one traverse period) is 20 cm. For a portion with a higher yarn speed within the traverse period, the slab determination is lax. For a portion with a lower yarn speed within the traverse period, the slab determination is stringent. - The yarn
defect detecting device 8 uses the instantaneous value of the yarn speed to convert the yarn thickness time varying data DT into the yarn thickness length varying data DL. The yarndefect detecting device 8 thus deals with the variation in yarn speed caused by traversing and is prevented from incorrectly determining for a yarn defect. - Strictly speaking, the instantaneous value of the yarn speed cannot be determined using the
yarn speed sensor 7. This is because the time width required to detect the yarn speed varies depending on the yarn speed. - With the spatial filter scheme, frequency, on the basis of which the yarn speed is determined, varies depending on the yarn speed. This varies the time required to detect the yarn speed. Further, with an encoder, pulsing interval, on the basis of which the yarn speed is determined, varies depending on the yarn speed. This varies the time required to detect the yarn speed.
- However, the time width required to detect the yarn speed corresponds to the time required for a given point on the yarn 3 to have passed by the
yarn speed sensor 7. The time width is thus much shorter than the traverse period. Consequently, in connection with the traverse period, the yarn speed detected by theyarn speed sensor 7 can be considered to be the instantaneous value of the yarn speed.
Claims (2)
- A textile machine comprising:a yarn speed detecting device (7) that directly detects a yarn speed of a travelling yarn or indirectly detects the yarn speed by detecting a rotation speed of a rotor rotating in direct proportion to the yarn speed, to output the detected value,a yarn defect detecting device (8) that detects a yarn defect in the travelling yarn,a winding device that winds the yarn having passed through the yarn speed detecting device (7) and the yarn defect detecting device (8),characterized in that:the yarn defect detecting device (8) comprisesa yarn thickness detecting device (81) that detects the yarn thickness of the passing yarn anda yarn defect determining device (82) that determines whether or not the yarn thickness corresponds to a yarn defect anda yarn cutting means (83) that cuts the yarn when the yarn thickness is determined to correspond to a yarn defect,
and wherein the yarn defect determining device (82) comprises a yarn thickness storing section (82a), a data converting section (82b), a determination criteria storing section (82c), and a yarn defect determining section (82d),wherein the yarn defect detecting device (8) converts yarn thickness time varying data (DT) obtained in a time-oriented manner into yarn thickness length varying data (DL) on the basis of the detected value of the yarn speed, to determine for a yarn defect on the basis of the yarn thickness length varying data, and whereby the yarn thickness time varying data (DT) is created by the yarn thickness storing section (82a) by arranging instantaneous values of the yarn thickness in a time-oriented manner, the yarn thickness storing section (82a) stores the instantaneous values of the yarn thickness detected by the yarn thickness detecting device (81),the data converting section (82b) converts the yarn thickness time varying data (DT) into the yarn thickness length varying data (DL) on the basis of the detected value of the yarn speed detected by the yarn speed sensor (7) utilizing the fact that the product of time and speed is distance, andthe yarn defect determining section (82d) determines a yarn defect on the basis of the yarn thickness length varying data (DL) and yarn defect determination criteria (DS) pre-stored in the determination criteria storing section (82c), the yarn defect determination criteria (DS) including a plurality of yarn defect levels, and a monitored length and a thickness corresponding to the monitored length which are set for each of the yarn defect levels andthe yarn defect determining section (82d) comprises an average yarn thickness calculating section (82d1) that averages the yarn thickness detected values over the monitored length and a comparative determining section (82d2) that compares the average yarn thickness with the corresponding thickness to determine that a yarn defect has occurred where the average yarn thickness exceeds the corresponding thickness,wherein the average yarn thickness calculating section (82d1) averages for the latest part of the yarn thickness length varying data (DL) constantly the yarn thickness detected over the monitored length corresponding to each defect level to calculate the average thickness, andthe comparative determining section (82d2) compares for each yarn defect level the average yarn thickness calculated by the average yarn thickness calculating section (82d1) with the thickness corresponding to that level and where the average yarn thickness exceeds the corresponding thickness, the comparative determining section (82d2) determines that a yarn defect has occurred. - A textile machine according to claim 1,
characterized in that
the yarn speed detecting device (7) utilizes a variation in the yarn thickness of the yarn to detect the moving speed of a varying portion of the yarn by means of a spatial filter method to determine the moving speed of the varying portion to be the detected value of the yarn speed.
Applications Claiming Priority (1)
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JP2005355302A JP2007153607A (en) | 2005-12-08 | 2005-12-08 | Textile machine |
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EP1795478B1 true EP1795478B1 (en) | 2011-03-30 |
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JP5126590B2 (en) * | 2008-02-14 | 2013-01-23 | 村田機械株式会社 | Yarn quality measuring instrument and yarn winding machine |
JP2013227155A (en) * | 2012-03-28 | 2013-11-07 | Murata Machinery Ltd | Yarn defect classifying apparatus and yarn winding machine |
TR201904577T4 (en) | 2013-06-10 | 2019-04-22 | Rieter Ag Maschf | Method and winding station for improving the winding process of a textile machine. |
EP3549892B1 (en) * | 2016-12-02 | 2021-06-16 | Murata Machinery, Ltd. | Yarn winding machine |
CZ2019196A3 (en) * | 2019-03-29 | 2020-10-07 | Rieter Cz S.R.O. | Non-contact optical detection method of yarn at the textile machine workplace for yarn production, optical yarn sensor and textile machine |
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DE19900581A1 (en) * | 1999-01-09 | 2000-07-27 | Univ Dresden Tech | Non-contact measurement of yarn speed or running length uses grid rods in a structured electrode array to give signals from the yarn electrostatic charge to be processed to display the speed/length values |
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JPS4841089B1 (en) * | 1970-10-20 | 1973-12-04 | ||
CH636323A5 (en) * | 1978-09-13 | 1983-05-31 | Zellweger Uster Ag | Process and device for obtaining electrical signals which correspond to the cross-section of spun yarns and are independent of the velocity thereof |
JPS62255366A (en) * | 1986-04-25 | 1987-11-07 | Murata Mach Ltd | Yarn defect detecting method |
CH675132A5 (en) * | 1987-09-01 | 1990-08-31 | Zellweger Uster Ag | |
JP2611611B2 (en) | 1992-10-16 | 1997-05-21 | 村田機械株式会社 | Yarn unevenness information analyzer |
DE10118660A1 (en) | 2001-04-14 | 2002-10-17 | Schlafhorst & Co W | Yarn cleaning device at the winding unit of a textile machine |
DE10342383A1 (en) | 2003-09-13 | 2005-05-25 | Saurer Gmbh & Co. Kg | Method and device for non-contact determination of the speed of a running thread |
JP4045444B2 (en) | 2004-01-06 | 2008-02-13 | 村田機械株式会社 | Spinning yarn winding device |
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2005
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DE19900581A1 (en) * | 1999-01-09 | 2000-07-27 | Univ Dresden Tech | Non-contact measurement of yarn speed or running length uses grid rods in a structured electrode array to give signals from the yarn electrostatic charge to be processed to display the speed/length values |
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