• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to the quality control of a yarn (1) in which length-valued diameter deviations are compared with a cleaning limit (14) arranged in a coordinate system and deviations above this cleaning limit (14) are cut out defining a bandwidth (18) for the cleaning limit (14) bearings in the coordinate system that are not considered to be error by a lower limit (15) below the diameter variations and an upper limit (16) above which any error is to be ruled out , is limited, wherein the bandwidth (18) is each varied so that the number of in the bandwidth (18) lying in the yarn (19) remaining error does not exceed a predetermined quality-dependent number per unit length.
    公开号:BE1018992A3
    申请号:E2009/0492
    申请日:2009-08-13
    公开日:2011-12-06
    发明作者:Iris Biermann；Olav Birlem；Gerhard Rienas
    申请人:Oerlikon Textile Gmbh & Co Kg；
    IPC主号:
    专利说明:

    Method for monitoring the quality of a longitudinally moving yarn at a workstation of a textile machine producing cross-wound bobbins
    The present invention relates to a method for
    Quality control of a longitudinally moving yarn at one
    Job of a cross-wound producing
    Textile machine in which error in the yarn by means of a device in terms of their longitudinal extent and
    Diameter deviation are rated and classified by comparing detected deviations with a predetermined cleaning limit.
    From EP 0 877 108 Bl a method for quality control of a longitudinally moving yarn is known. According to this method, measurable properties of the yarn are detected during production or during rewinding thereof, wherein yarn defects to be cleaned are defined by the adjustable cleaning limit, after which it is determined which yarn defects must be cleaned and which ones are not .. The method according to EP 0 877 108 Bl moreover, provides for adapting the cleaner limit to changing conditions at the workstation or the textile machine. Based on a preset cleaning limit, this is recalculated and adjusted depending on the current and virtual frequency of cutting. If, for example, the cutting frequency decreases due to the higher quality of the yarn, the cleaner limit is shifted in such a way that errors are removed that were previously tolerated. This procedure is usually at the expense of
    Productivity of the textile machine.
    Thus, the invention has for its object to provide a method which allows compliance with a selected quality of the yarn with the best possible productivity.
    The object is achieved by a method according to the characterizing part of claim 1.
    Advantageous developments of the invention can be found in the dependent claims.
    According to claim 1 it is proposed that initially a bandwidth for the position of the cleaning limit in the coordinate system is defined, which by a.
    Lower limit, below the diameter variations are not evaluated as errors and an upper limit above which any error is to be determined, is limited, and that the cleaning limit is varied within this range at the given yarn quality at the work so that the number of cleaning between the and the lower limit and therefore remaining in the yarn error does not exceed a predetermined and dependent on the desired minimum quality number per unit length of the yarn or the fabric produced later. This ensures minimum coil or manufacturing quality with the best possible productivity. Within a limit set by the upper limit and the lower limit
    Depending on the selected quality of the yarn set bandwidth, a flexible, automated adjustment of the cleaning limit to changing winding or manufacturing conditions is performed on the textile machine.
    Thus, as the number of uncorrected errors decreases, the cleaning limit may be shifted toward the upper limit while the cleaning limit is shifted toward the lower limit as the number of uncorrected errors increases. In this way, inter alia, the fact is taken into account that when using new spin agents, such as a new spinning rotor, with the same cleaning limit, the number of unrefined errors in the yarn, based on a specific yarn length or on a length or surface of a later manufactured
    Sheet is smaller than in a spinning rotor, which has already been in use over a certain period of time and thus has a corresponding wear. By shifting the cleaner limit in the direction of the upper limit, it is thus possible for defects to remain in the yarn that would have been purified from the original setting of the cleaner limit. By shifting the cleaning limit, the number of cleaner cuts is reduced, which in turn increases productivity. Conversely, with increasing wear of the spin agent, the number of remaining yarn defects will increase, thus shifting the cleaner limit toward the lower limit. As a result, the number of cleaner cuts increases without violating the quality criterion, the permissible number of uncorrected defects in the yarn.
    Preferably, the cleaning limit can be partially shifted within the bandwidth. In this case, for example, the displacement takes place along a normal, which preferably runs within the region to be displaced perpendicular to the upper or lower limit.
    As a result, errors in certain length ranges can be more hidden or allowed.
    Furthermore, the cleaning limit can be shifted within the bandwidth parallel to the lower limit and / or the upper limit, whereby always equal distances along the cleaning curve to the upper or lower limit are maintained, that is, a constant cleaning profile is generated.
    Alternatively, the cleaning limit can be shifted parallel to the abscissa.
    Similarly, the cleaning limit can be moved parallel to the ordinate.
    In such a, possibly even partial displacement, the cleaning limit should only be shifted until the first reaching of a point of the cleaning limit with the upper limit or the lower limit. In this way it can be avoided that the cleaning limit is outside the range tolerable for the quality and productivity, which would lead to an unreasonable number of cleaner cuts, or the number of unrefined errors. in the yarn according to the selected quality specification.
    Furthermore, alternatively, a family of curves of cleaning limits can be stored in a memory from which, in a variation of the cleaning limit according to the invention, a different one from the one used until then is selected.
    The invention will be explained in more detail with reference to an embodiment shown in the drawings.
    Show it:
    Fig. 1 is a schematic representation of a spinning station;
    Fig. 2 to Fig. 5 different courses of a
    Cleaning limit, represented in a Cartesian coordinate system.
    The method according to the invention is explained below with reference to an open-end rotor spinning machine, but can also be used on other textile machines, of which a testing and / or monitoring device is provided for the quality control of a longitudinally moving yarn.
    In the spinning station 1 of an open-end rotor spinning machine shown in Fig. 1, a yarn 1 by a
    Garnabzugsröhrchen 2 from a spin box 3 on a
    Cheese 4 wound up. The yarn 19 passes between the take-off tube 2 and the cheese 4 a quality control serving cleaner 5, the one
    Measuring head 6, a cutting device 7 and a processor 8 includes, and then a guide eye 9. A drive drum 10 drives the cheese 4 during the winding by means of frictional engagement. A motor 11 gives the drive drum 10 the required rotational movement for the winding.
    The cleaner 5 serves to continuously monitor the quality of the running yarn 19 during the manufacturing process. For this purpose, the diameter of the running yarn 1 is measured by means of the cleaner 5 and compared with a predetermined diameter value. For the diameter or thickness measurement and the linear expansion of a measured diameter deviation of the yarn 19, a known optical and / or capacitive sensor device is used. The cleaner 5 used for this purpose comprises an integrated measuring head 6 operating on an optical and / or capacitive basis. For processing the acquired measuring data, the cleaner 5 is equipped with further devices for controlling, data storage, evaluation and control of further elements of the spinning station or the rotor spinning machine by means of a Line 12 connected.
    If the cleaner 5 detects an inadmissible undershooting or exceeding of the diameter of the yarn 1, the length of this yarn defect is detected via a control device 13. If an unacceptable yarn error is detected according to a predefinable cleaning limit 14, as shown by way of example in FIGS. 2 to 5, the sliver feed to the dissolving device in the spin box 3 is interrupted and the yarn defect is cleaned out.
    FIG. 2 shows an exemplary course of the specifiable cleaning limit 14 in a Cartesian coordinate system in which the length of the yarn 19 is plotted along the abscissa and the deviation of the diameter of the yarn 19 is plotted over the ordinate. The cleaning limit 14 runs between a predefinable lower limit 15 and a predefinable upper limit 16. Die
    Lower limit 15 represents diameter fluctuations with respect to their longitudinal extent, wherein below the lower limit 15 the deviation of the diameter is not evaluated as an error. On the other hand, above the upper limit 16, every deviation of the diameter should be eliminated as an error.
    Between the lower limit 15 and the upper limit 16, a bandwidth 18 is formed within which the course of the cleaning limit 14 can be shifted, at least in some areas, without violating a previously defined quality criterion, which is the permissible number of imperfections per unit length of the yarn or in a fabric produced later from the yarn. The partial or complete displacement of the cleaning limit 14 is effected as a function of the currently present spinning conditions at at least one spinning station 1. With a reduction in the number of required cleaner cuts due to a decreasing number of diameter fluctuations that lie between .cleaning limit 14 and lower limit 15 the cleaning limit 14 is shifted in the direction of the upper limit 16, towards a less sharp setting. This is the case, for example, if the replacement of spin agents at the spinning station 1 increases the quality of the yarn 19 produced by rotor spinning, since the number of imperfections decreases. In the opposite case, the cleaning limit 14 is shifted in the direction of the lower limit 15, if the number of remaining errors exceeds the permissible number. The variation of the cleaning limit 14 within the bandwidth 18 takes place in such a way that the lower limit 15 or the
    Upper limit 16 does not happen. In this way, it is ensured that the produced yarn 19 has the highest possible productivity of the spinning station 1 a desired minimum quality, that is, does not exceed a predetermined number of unrefined errors in the yarn or a later produced therefrom fabric.
    As indicated in FIG. 2, the cleaning limit 14 is varied in the direction of the lower limit 15 or upper limit 16 orthogonal to its course, indicated by a displacement along a straight line 17. The straight line 17 is executed in the illustrated embodiment as an angle bisector normal to the Intersection with the cleaning limit 14 runs. The displacement can take place parallel to the lower limit 15 or to the upper limit 16, or by rotating the cleaning limit 14 about the point of intersection of the straight line 17 with the cleaning limit 14.
    Deviating from this, a shift of only a partial area of the cleaning boundary 14 can be achieved by laying the straight line 17 in the region to be displaced so as to cover only a partial area of the cleaning boundary 14 along the straight line 17 normal to an intersection of the straight line 17 with the cleaning boundary 14, while the remainder of the cleaning boundary 14 is not displaced, as shown in FIG.
    FIGS. 4 and 5 each show a further alternative of the displacement of the cleaning boundary 14 within the bandwidth 18 which is established between the lower limit 15 and the upper limit 16.
    According to FIG. 4, the cleaning limit 14 is shifted parallel to the abscissa. Corresponding to this, the shift takes place according to FIG. 5 parallel to the ordinate. Even in the embodiments shown in FIGS. 4 and 5, only a partial displacement of the cleaning boundary 14 is possible. All variants of the displacement of the cleaner boundary 14 have in common that with the coincidence of a point of the cleaning boundary 14 with the lower limit 15 or the upper limit 16, a further shift is not possible. The lower limit 15 or the upper limit 16 form exclusively limits with regard to the productivity and the quality of the yarn 19 to be produced or to be wound.
    权利要求:
    Claims (9)
    [1]
    1. A method for quality monitoring of a longitudinally moving yarn (1) at a workstation (1) of a cross-wound textile machine, in which errors in the yarn (19) by means of a test device (5) and an evaluation device (13) are evaluated in terms of their diameter deviation and longitudinal extent, characterized in that lengthwise diameter deviations determined are compared with a cleaning limit (14) arranged in a coordinate system having the deviations in diameter and length, and where deviations above this cleaning limit (14) are cut out, characterized in that a range (18) for the position of the cleaning limit ( 14) is defined in the coordinate system which is not bounded by a lower limit (15), below the diameter variations as an error and an upper limit (16), above which each error is to be determined, and that the cleaning limit (14) innenh the bandwidth (18) at the respective given yarn quality at the workstation (1) is varied such that the number of errors lying between the cleaning limit (14) and the lower limit (15) and therefore remaining in the yarn (19) is a specifiable quality-dependent The number per unit length of the yarn (19) or the fabric produced later does not exceed.
    [2]
    A method according to claim 1, characterized in that the cleaning limit (14) is shifted towards the upper limit (15) as the number of uncorrected errors decreases, while the cleaning limit (14) increases towards the lower limit as the number of uncorrected errors increases (16) is moved.
    [3]
    3. The method according to claim 1 or 2, characterized in that. the cleaning limit (14) is partially shifted within the bandwidth (18).
    [4]
    4. The method according to any one of claims 1 to 3, characterized in that the cleaning limit (14) within the bandwidth (18) parallel to the lower limit (15) and / or the upper limit (16) is moved.
    [5]
    5. The method according to any one of claims 1 to 3, characterized in that the cleaning limit (14) is shifted orthogonal to its course.
    [6]
    6. The method according to any one of claims 4 or 5, characterized in that the cleaning limit (14) is displaced parallel to the abscissa.
    [7]
    7. The method according to any one of claims 4 or 5, characterized in that the cleaning limit (14) is moved parallel to the ordinate.
    [8]
    8. The method according to any one of the preceding claims, characterized in that a plurality of cleaning limits (14) is stored in a memory and in each case the variation of the cleaning limit (14) by selecting a different 'cleaning limit from the memory.
    [9]
    9. The method according to any one of claims 2 to 7, characterized in that the cleaning limit (14) until the first collapse of a point of the cleaning limit (14) with the lower limit (15) or the upper limit (16) is moved.
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    同族专利:
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    引用文献:
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    EP1295835A2|2001-08-28|2003-03-26|Rieter Ingolstadt Spinnereimaschinenbau AG|Method for setting a clearing limit line in an electronic yarn clearer|
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    DE10129201A1|2001-06-18|2002-12-19|Rieter Ingolstadt Spinnerei|For a self-setting operation at a yarn processing machine, threshold values are established for a yarn thickness where a yarn break probability can be set, with measurements for variations to alter them for a second probability|
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    CN111472159B|2020-05-09|2021-09-03|苏州基列德智能制造有限公司|Fixed-length detection method and system for textile equipment and storage medium|
    法律状态:
    2014-02-28| RE| Patent lapsed|Effective date: 20130831 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102008037758|2008-08-14|
    DE102008037758.9A|DE102008037758B4|2008-08-14|2008-08-14|Method for monitoring the quality of a longitudinally moving yarn at a workstation of a textile machine producing cross-wound bobbins|
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