EP1775249B1 - Verfahren zum Präzisionsmessen der Länge des auf eine Spule gewickelten Fadens - Google Patents

Verfahren zum Präzisionsmessen der Länge des auf eine Spule gewickelten Fadens Download PDF

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Publication number
EP1775249B1
EP1775249B1 EP06121012A EP06121012A EP1775249B1 EP 1775249 B1 EP1775249 B1 EP 1775249B1 EP 06121012 A EP06121012 A EP 06121012A EP 06121012 A EP06121012 A EP 06121012A EP 1775249 B1 EP1775249 B1 EP 1775249B1
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EP
European Patent Office
Prior art keywords
bobbin
length
measuring
yarn
driving roll
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Not-in-force
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EP06121012A
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English (en)
French (fr)
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EP1775249A1 (de
Inventor
Roberto Badiali
Giorgio Colomberotto
Demetrio Claut
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Savio Macchine Tessili SpA
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Savio Macchine Tessili SpA
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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
    • 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
    • B65H63/08—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to delivery of a measured length of material, completion of winding of a package, or filling of a receptacle
    • 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 present invention relates to a device and process for the precision measurement of the length of thread wound onto a bobbin in an automatic bobbin-winder.
  • the invention is described herein with reference to the winding of thread onto a conical tube forming a conical bobbin, moved with a driving roll having a straight cylindrical shape, but with the notification that it can also be applied in the formation of straight cylindrical bobbins, moved in rotation on conical rolls.
  • Bobbin-winders generally consist of a series of heads or winding units aligned along the front of the machine and equipped with common service devices for their management; they are all independent of each other and consequently the bobbins in formation can have different advance degrees in their winding.
  • the bobbin 10 is held by the bobbin-holder arm 11 equipped with two dead centres 12, 13 which are engaged with the conical tube 14 at the base of the bobbin.
  • the conical bobbin in formation 10 rests on its driving roll 16, driven by a motor M.
  • Said driving roll is equipped with traversing helixes 17 which distribute the thread 18 with an axial backward and forward movement on the surface of the bobbin 10, whereas the driving roll transmits the torque necessary for its winding.
  • the number of traversing helixes situated on the driving roll 16 varies according to the yarn counts and density of the bobbin to be obtained; the driving roll generally has 1.5-2-2.5-3 helixes for each turn.
  • the pitch of the helix can be constant or variable.
  • the bobbin 10 in formation progressively increases in dimension and weight.
  • the pressure of the bobbin on its driving roll 16 has a great influence on the density of the bobbin itself.
  • the bobbin 10 is shown already close to its final dimension.
  • the length of thread wound onto each of the bobbins has a real value which significantly varies between the winding units which form the bobbin-winder. It mainly depends on the slippages between the surface of the bobbin 10 and the surface of the driving roll 16 pulling it. There are many reasons for these slippages. Firstly, there is a geometrical reason due to the conicity of the bobbin 10 which rests on the straight driving roll 16. In a single axial coordinate of the resting line of the bobbin on its driving roll, there is a "neutral" point, in which the surface of the bobbin has the same linear (or tangential) rate as the surface of the roll.
  • the axial coordinate of the "neutral" point is not constant during the whole winding period of the bobbin. Said axial coordinate can vary in both a controlled manner for the modulation of the rate of the bobbin acting on the relative axial displacement between the bobbin-holder arm and the driving roll, and also without control.
  • Cylindrical bobbins can also have slippages, even if less marked, due to the variation in the flattening of the bobbin on the driving roll or to parallelism defects between the roll and the bobbin, as well as construction imperfections or in the position between the parts, or maintenance faults. Variations in the friction coefficient between the various bobbin-winding units can occur due to variations in temperature or humidity, paraffining of the thread, variations in the flow of the bearings of the dead centres due to fouling or lubrication defects. All of these factors cause slippage between the various winding units resulting in differences in length between the bobbins contemporaneously produced which can reach 2-3%.
  • the average slippage which occurs on a bobbin-winder is in the order of 1.5%.
  • an average overall correction of the theoretical length established is inserted into the control unit of the machine, currently a correction factor K, which should recover the average slippage of the bobbins.
  • K which should recover the average slippage of the bobbins.
  • the corrective effect is obtained as the average of bobbins reaches the desired length, but there is a certain number of bobbins however, which, as a result of dispersion of the slippage causes, have a lesser or greater length than the average with a Gaussian-type distribution of the real length of ⁇ 2%.
  • each bobbin-winding unit the bobbin-winding is terminated when the value of the product N c M c is equal to MF.
  • the bobbins When the bobbins are finished, they are weighed or unwound and measured, comparing the effective final length value with the theoretical value MF established. Their ratio corresponds to the correction factor K to be introduced into the control unit of the machine to correct the MF for the subsequent bobbins. If the theoretical value established MF, for example, is 1 kg of yarn per bobbin and the actual average value measured on the sample bobbins is 0.984 kg, the correction factor K will be equal to 1/0.984.
  • the operation is then set for the whole bobbin-winder by inserting the final theoretical length data MF for each bobbin corrected with the correction factor K revealed.
  • the correction factor K is sample controlled, possibly adjusting it and re-establishing it on the control unit.
  • the correction factors K are revealed and catalogued for each different operation for possible re-use.
  • This length detection method does not take into account the fact that the yarn is spirally wound with an axial length component due to the traversing movement with which the thread is distributed on the bobbin.
  • An objective of the present invention is therefore to provide a device and process for measuring the length of the yarn wound onto a bobbin, which overcomes the drawbacks of the measuring systems according to the known art and gives a precise and reliable measurement.
  • the present invention is described herein with reference to its main application to the formation of conical bobbins, for illustrative purposes, as the device and process according to the present invention can find advantageous applications in the formation of cylindrical bobbins or on machines different from bobbin-winders.
  • a measuring process of length of yarn wound onto a conical tube is defined in claim 1.
  • Preferred variants or embodiments are defined in the dependent claims 2 to 6.
  • the measuring process according to the present invention is based on the following logic.
  • the real rising and winding rate of the yarn, insensitive to both slippage and flattening of the bobbin, is directly proportional to the number of revs of the bobbin multiplied by the actual diameter of the bobbin with respect to its tangential component V y .
  • V y ⁇ r ⁇ ⁇ r / 2 wherein ⁇ r indicates the angular rate of the bobbin and ⁇ r indicates the bobbin diameter revealed.
  • the transversal component of the rate V x due to the traversing, is also taken into account during the measuring.
  • V x ⁇ c T / 2 ⁇ N e
  • ⁇ c the angular rate of the roll
  • T the traversing run
  • N e the number of helixes of the roll.
  • This determination logic of the real winding thread rate is insensitive to any kind of slippage and supplies much greater precision information than that provided by the systems of the known art.
  • the measuring process of the length of yarn wound onto a bobbin is effected with the following steps.
  • m fx ⁇ ⁇ N c T / N e
  • ⁇ N c the number of revs of the driving roll in the interval
  • T the traversing run
  • N e the number of helixes of the roll.
  • the overall length of wound thread is therefore measured by integrating the partial lengths progressively recorded during the advancement of the bobbin. If the measuring intervals are sufficiently small to assume that the diameter ⁇ r does not substantially vary during each of these intervals and that the return rate of the thread is constant, the progressive length therefore faithfully corresponds to the sum of the lengths m f revealed from the beginning of the bobbin.
  • Discreet measuring intervals of the length wound can be simply equal time intervals, for example by effecting a measurement every two seconds, and then summing the lengths measured. These intervals do not necessarily have to be constant.
  • discreet measuring intervals refer not to time but to the progressive number of revs of the driving roll from the start of the bobbin, for example every hundred revs of the driving roll.
  • the partial lengths measured each time are cleared of the effects of the rotation periods at a variable rate due to interruptions in the thread and subsequent joinings, winding modulations to avoid tangling on the bobbin, or periods of transitory movement for any reason.
  • the first of the addends of the expression (g) is a fixed term which does not have to be determined each time.
  • the measurement of the real diameter of the bobbin is effected with a distance sensor 20, for example a reflection laser sensor, assembled integrally on the bobbin-holder arm 11, as shown in figure 2 , in a fixed geometrical position and oriented for measuring the distance between the surface of the bobbin and the emitter, preferably according to a straight line 22, intersecting the axis of the bobbin 21 and orthogonal thereto, in an axial coordinate having a value a.
  • a distance sensor 20 for example a reflection laser sensor, assembled integrally on the bobbin-holder arm 11, as shown in figure 2 , in a fixed geometrical position and oriented for measuring the distance between the surface of the bobbin and the emitter, preferably according to a straight line 22, intersecting the axis of the bobbin 21 and orthogonal thereto, in an axial coordinate having a value a.
  • the deformation of the surface of the bobbin in the supporting line on the cylinder does not influence the measurement of the diameter as the measuring point is suitably situated at a due distance from said line, as illustrated in figure 2 .
  • the bobbin 10 is shown in the figure in its dimension in the initial phase of its formation.
  • the axial positioning of the sensor 20 determines the axial coordinate in which the measurement of the diameter is effected and influences the value of the measurement of the ⁇ revealed in that coordinate.
  • the measurement of the diameter of the bobbin corresponding to a certain axial coordinate allows the diameter of the spiral wound in each axial coordinate of its generatrix to be calculated, according to a linear law if the cylinder has a helix cavity with a constant pitch or according to a law of weight if said helix has a variable pitch.
  • the measuring device of the length of yarn wound onto a bobbin consists of the following components:
  • the measuring device further comprises a measurer 20 of the diameter of the bobbin 10, preferably firmly positioned on the bobbin-holder arm. It can be produced with various procedures. For the direct measurement of the diameter a reflection laser can be used, which calculates the distance between the sensor and the object by means of the triangulation technique, or a so-called "flight time" laser which measures the time displacement between the ray emitted and that reflected: the greater the distance, the greater the displacement/delay will be. Alternatively, as the geometry of the bobbin-holder arm is known, the detection of the geometrical position of the arm with respect to the driving roll allows the measurement of the diameter of the bobbin to be obtained.
  • Said detection can be effected, for example, with an angular potentiometer which provides the measurement of the rising of the bobbin-holder arm with respect to the driving roll: when the geometry of the group is known, the diameter of the bobbin can be determined.
  • an angular potentiometer which provides the measurement of the rising of the bobbin-holder arm with respect to the driving roll: when the geometry of the group is known, the diameter of the bobbin can be determined.
  • the measurement of a distance of a point integral with the bobbin-holder arm with respect to a point integral with the driving roll group by means of an induction or magnetic or optical sensor allows the diameter of the bobbin in formation to be obtained.
  • Reflection laser sensors which form one of the preferred embodiments of the invention, can be easily assembled with precision on the bobbin-holder arm 11, for example with the help of positioning templates, whereby it is possible to fall within the tolerances requested for the precise measuring of the bobbin diameter with these types of sensors.
  • the measurement is insensitive to slippages, as a velocity measurement is effected directly on the bobbin, and also insensitive to the slippage variation of the bearings and to environmental factors.
  • the measurement is also insensitive to the higher or lower density of the bobbin, as the measurement of the bobbin diameter can be effected in an area which is not influenced by the flattening of the bobbin.
  • the reading is independent of the type and count of the yarn, which can be single, twisted, regular or irregular, smooth or hairy.
  • the calculation of the length is simple, it does not require a high calculating capacity or high processing rate.
  • the application of the device does not hinder the thread run and is in a protected position with respect to impact or contacts, also accidental.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Storage Of Web-Like Or Filamentary Materials (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
  • Winding Filamentary Materials (AREA)

Claims (6)

  1. Prozess zum Messen der Länge eines Garns (18) oder Fadens, das bzw. der auf ein konisches Rohr (14) gewickelt ist, das eine konische Haspel (10) bildet, wobei die Haspel durch einen Haspelhalterarm (11) gehalten wird, der mit zwei Totpunkten (12, 13) versehen ist, die mit dem konischen Rohr (14) an beiden Ende in Eingriff sind, wobei die Haspel auf einer geradlinigen Antriebsrolle (16) aufliegt, die durch einen Motor (M) angetrieben wird und mit quer verlaufenden Schraubenlinien (17) versehen ist, die das Garn auf der Oberfläche der Haspel mit axial rückwärts und vorwärts sich bewegendem Querlauf verteilen, wobei der Prozess durch die Folge der folgenden Schritte ausgeführt wird, die in diskreten Messintervallen der Wicklung und für jedes Intervall ausgeführt werden:
    - Bestimmen der Länge des Garns mfy, das in einer tangentialen Richtung gewickelt wird, anhand der Messung der Anzahl ΔNr der Umdrehungen der Haspel in dem Intervall und des Haspeldurchmessers Φr, der während desselben Intervalls freigegeben wird, gemäß der folgenden Formel: m fy = ΔN r π Φ r
    Figure imgb0014
    - Bestimmen der Länge des Garns mfx, das im selben Intervall in einer axialen Richtung gewickelt wird, anhand der Messung der Anzahl ΔNc der Umdrehungen der Antriebsrolle (16) in diesem Intervall gemäß der folgenden Formel: m fx = ΔN c T / Ne
    Figure imgb0015
    wobei T der Querlauf ist und Ne die Anzahl von Schraubenlinienwindungen (17) der Antriebsrolle (16) ist,
    - Zusammensetzen der tangentialen und axialen Komponenten, um in jedem progressiv angegebenen Intervall die Teillänge mf, die schraubenlinienartig auf die Haspel gewickelt ist, gemäß der folgenden Formel zu erhalten: m f = ΔN c T / Ne 2 + ΔN r π Φ r 2 1 / 2
    Figure imgb0016
    - Integrieren der Teillängen mf, die während der Bildung der Haspel progressiv angegeben werden, um die progressiv gewickelte Länge zu erhalten.
  2. Prozess zum Messen der Länge eines Garns nach Anspruch 1, dadurch gekennzeichnet, dass die diskreten Messintervalle auf die progressive Anzahl der Umdrehungen der Antriebrolle (16) beginnend beim Start der Haspel bezogen sind.
  3. Prozess zum Messen der Länge eines Garns nach Anspruch 2, dadurch gekennzeichnet, dass die Messung des Durchmessers Φr der Haspel (10) mit einem Abstandssensor (20) ausgeführt wird, der einteilig an dem Haspelhalterarm (11) angebracht ist.
  4. Prozess zum Messen der Länge eines Garns nach Anspruch 3, dadurch gekennzeichnet, dass der Abstandssensor (20) ein mit Reflexion arbeitender Lasersensor ist.
  5. Prozess zum Messen der Länge eines Garns nach Anspruch 1, dadurch gekennzeichnet, dass die Messung des Durchmessers Φr der Haspel (10) durch Detektieren der geometrischen Position des Haspelhalterarms (11) in Bezug auf die Antriebsrolle (16) ausgeführt wird.
  6. Prozess zum Messen der Länge eines Garns nach Anspruch 5, dadurch gekennzeichnet, dass die Detektion der geometrischen Position des Haspelhalterarms in Bezug auf die Antriebsrolle (16) mit einem Winkel-Potentiometer ausgeführt wird, das die Messung des Anstiegs des Haspelhalterarms (11) in Bezug auf die Antriebsrolle (16) ergibt.
EP06121012A 2005-10-13 2006-09-21 Verfahren zum Präzisionsmessen der Länge des auf eine Spule gewickelten Fadens Not-in-force EP1775249B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT001929A ITMI20051929A1 (it) 2005-10-13 2005-10-13 Dispositivo e procedimento per la misurazione di precisioni della metratura del filo avvolto su una rocca

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EP1775249A1 EP1775249A1 (de) 2007-04-18
EP1775249B1 true EP1775249B1 (de) 2010-04-14

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US (1) US20070084957A1 (de)
EP (1) EP1775249B1 (de)
CN (1) CN1948109B (de)
AT (1) ATE464264T1 (de)
DE (1) DE602006013563D1 (de)
IT (1) ITMI20051929A1 (de)

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US20110165129A1 (en) * 2008-05-06 2011-07-07 Arnold Kriegstein Ameliorating Nervous Systems Disorders
CN102954778B (zh) * 2011-08-30 2015-11-25 苏州迪盛织造整理有限公司 一种织轴经丝长度测算的方法
CN105540325A (zh) * 2013-11-28 2016-05-04 刘伟华 适合在野外施工的电缆铺设辅助装置
CN105712124A (zh) * 2013-11-28 2016-06-29 刘伟华 电力系统专用铺线器
EP2907906B1 (de) * 2014-02-13 2016-05-25 L.G.L. Electronics S.p.A. Bestandskontrollverfahren für einen Speichergarnzuführer mit Drehtrommel
CN104058300A (zh) * 2014-06-13 2014-09-24 中山市宏图精密机械制造有限公司 一种测量空气包覆纱机卷筒直径及卷筒上纱线厚度的方法
CN106743936B (zh) * 2017-01-09 2018-03-23 龙岩烟草工业有限责任公司 水松纸片长度检测装置、方法和卷接机
US10207890B2 (en) * 2017-05-19 2019-02-19 Reelex Packaging Solutions, Inc. Apparatus and method for winding coil
CN107525473A (zh) * 2017-06-22 2017-12-29 卡尔迈耶（中国）有限公司 测量经编机送经长度的方法
CN114717741B (zh) * 2022-04-28 2023-03-28 南京航空航天大学 一种三维编织机的携纱器上的自动分纱系统及方法

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Publication number Publication date
ITMI20051929A1 (it) 2007-04-14
EP1775249A1 (de) 2007-04-18
CN1948109B (zh) 2011-05-18
DE602006013563D1 (de) 2010-05-27
CN1948109A (zh) 2007-04-18
US20070084957A1 (en) 2007-04-19
ATE464264T1 (de) 2010-04-15

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