EP0486896B1 - Verfahren zum Aufspulen eines Fadens in gestufter Präzisionswicklung - Google Patents

Verfahren zum Aufspulen eines Fadens in gestufter Präzisionswicklung Download PDF

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Publication number
EP0486896B1
EP0486896B1 EP91119040A EP91119040A EP0486896B1 EP 0486896 B1 EP0486896 B1 EP 0486896B1 EP 91119040 A EP91119040 A EP 91119040A EP 91119040 A EP91119040 A EP 91119040A EP 0486896 B1 EP0486896 B1 EP 0486896B1
Authority
EP
European Patent Office
Prior art keywords
winding
turns
mirror
mirroring
thread
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91119040A
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German (de)
English (en)
French (fr)
Other versions
EP0486896A1 (de
Inventor
Heiner Kudrus
Ekkehard Schlüter
Günter Dr. Grabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEUMAG Neumuenstersche Maschinen und Anlagenbau GmbH
Original Assignee
NEUMAG Neumuenstersche Maschinen und Anlagenbau GmbH
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Filing date
Publication date
Application filed by NEUMAG Neumuenstersche Maschinen und Anlagenbau GmbH filed Critical NEUMAG Neumuenstersche Maschinen und Anlagenbau GmbH
Publication of EP0486896A1 publication Critical patent/EP0486896A1/de
Application granted granted Critical
Publication of EP0486896B1 publication Critical patent/EP0486896B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H54/00—Winding, coiling, or depositing filamentary material
    • B65H54/02—Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers
    • B65H54/38—Arrangements for preventing ribbon winding ; Arrangements for preventing irregular edge forming, e.g. edge raising or yarn falling from the edge
    • B65H54/381—Preventing ribbon winding in a precision winding apparatus, i.e. with a constant ratio between the rotational speed of the bobbin spindle and the rotational speed of the traversing device driving shaft
    • B65H54/383—Preventing ribbon winding in a precision winding apparatus, i.e. with a constant ratio between the rotational speed of the bobbin spindle and the rotational speed of the traversing device driving shaft in a stepped precision winding apparatus, i.e. with a constant wind ratio in each step
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the invention relates to a method for winding a continuously fed thread according to the preamble of patent claim 1.
  • the traversing frequency is constant in the wild winding. This results in a constant thread laying angle.
  • the number of turns ie the ratio of speed / traversing frequency, decreases continuously with increasing diameter. If the number of turns becomes an integer or assumes a value that differs from an integer by a simple fraction, such as 1 1/2 (second order), 2 2/3 (third order), 5 3/4 (fourth order) , so-called mirror windings are created.
  • the figures below for which mirror windings are created are ie the whole and the mixed numbers, referred to as "mirror values".
  • the characteristic feature of a mirror winding is that turns are placed exactly on turns previously laid. With integer number of turns, ie with mirrors of the first order, the turns of successive layers lie on top of each other. Second-order mirrors cover every other layer, etc.
  • the "layer” is the piece of thread that is placed on the spool during a double stroke, i.e. while the traversing thread guide moves from one end of the bobbin to the other and back.
  • the "thread” is the piece of thread that is put on during one revolution.
  • the number of turns i is the number of turns per layer.
  • mirror windings can cause a number of disadvantages, in particular an unstable spool structure, difficulties in unwinding the affected spool and unevenness in a subsequent coloring.
  • the traversing speed is in a fixed ratio to the speed of the coil; the number of turns therefore remains constant.
  • the traversing frequency also becomes smaller and smaller as the coil diameter increases.
  • the result is that the thread-laying angle also becomes smaller and smaller.
  • This method can therefore only be used to a limited extent. However, it has the advantage that one can avoid mirror formation by choosing the number of turns.
  • the winding is built up in several stages. In each individual stage - as with precision winding - the traversing frequency decreases proportionally with the coil speed. When the smallest still allowable placement angle has been set, the traversing frequency is increased abruptly. This creates a new, smaller number of turns. This process is repeated until the specified coil diameter is reached. With this method, it can happen that when the traversing frequency is increased, the number of turns falls to or near a mirror value. Mirror formation also occurs when the number of turns does not exactly match the mirror value, but is in an area in the closer vicinity of the mirror value. This area is referred to below as the "critical area”. The mirror formation can be much more pronounced than in the wild winding.
  • mirrors of the same atomic number can have different effects.
  • the person skilled in the art must therefore take those mirror values into account in each individual case, taking particular account of the atomic number determine, the avoidance of which is desirable considering the respective circumstances.
  • these mirror values are referred to below as "dangerous mirror values".
  • the dangerous mirror values in the sense of the invention include the whole numbers and the half-numbered intermediate values. In most practical cases, this also includes mirror values with higher atomic numbers, max. up to about the tenth order.
  • the invention is based on a method which has become known from EP-A1-0 375 043.
  • the number of turns of the individual stages is calculated using a computer.
  • the number of turns calculated in this way is compared with the dangerous mirror values. If it turns out that the distance between a number of turns falls below a predetermined minimum distance from a dangerous mirror value, then a corrected number of turns is used which maintains the minimum distance.
  • the minimum distance is defined - in accordance with all dangerous mirror values - on the basis of a diagram in which the current coil diameter is plotted on the abscissa and the current placement angle is plotted on the ordinate.
  • the working point runs through a hyperbolic working line with a constant number of turns.
  • the working lines must keep a minimum distance from the prohibited lines that correspond to the dangerous mirror values.
  • the minimum distance is defined as half the distance between the two closest neighboring forbidden lines.
  • EP-A-0 401 781 state of the art according to Article 54 (3) EPC, also deals with a winding-up method in a graduated precision winding. It assumes that when using a controllable connection of the drives of the coil and traversing device, the number of turns fluctuates periodically around the desired setpoint. The coil structure is adversely affected if the number of turns passes through mirror values within the control range, even if the mirror values are very high, above 50 or even above 100. It should therefore be ensured that no mirror value can be found in the range of the control fluctuations of the respective number of turns, whose ordinal number is below a limit which depends on the control range.
  • EP-A-0 093 258 deals with winding in a wild winding.
  • the traversing frequency is changed when approaching a mirror value, so that a predetermined safety distance is maintained. This can be freely determined for the individual mirror values. It is preferably proportional to the number of turns. The proportionality factor can be changed in the course of the coil travel, it being possible to distinguish between first-order mirrors and higher-order mirrors.
  • the document does not contain any further details.
  • the mirror values are also skipped in the case of a wild winding.
  • three different oscillation frequencies are available, which enable four different frequency hops.
  • the document is not precisely defined. It can be seen from examples that the jump height, ie the safety distance, is clear for first-order mirrors than for higher-order mirrors. However, no distinctive difference depending on the atomic number is discernible between the various higher orders.
  • Every correction of the calculated number of turns in the stepped precision winding results in a restriction of the usable range of the traversing frequency and thus a reduction in the thread length that can be wound up in the relevant step. If several corrections are made when building a coil, this can increase the number of stages. However, it is desirable to keep the number of switching operations as low as possible, since each switching operation means a brief, hardly controllable disturbance. A correction should therefore only be carried out if there is actually an acute risk of mirror formation. For the same reason, the corrective intervention should be kept as small as possible. There is another reason for this:
  • a correction factor that is too large can result in the number of turns avoiding one critical area at a distance, but falling into a critical area of a different order. Did you want e.g. avoiding a first-order mirror by increasing an exactly integer number of turns by 0.2, this would result in a fifth-order mirror. This consideration shows that there is a connection between the correction of the number of turns and the largest atomic number to be considered: In order to be able to take high atomic numbers into account, the correction quantity must be limited.
  • the invention has for its object to provide a method of the type specified in the preamble of claim 1, which allows on the one hand to avoid mirror formation up to higher ordinal numbers and on the other hand to keep the number and size of corrective interventions within narrow limits.
  • Figures 1 to 4 are assigned to Examples 1 to 4.
  • Figure 5 illustrates the underlying considerations of the inventors.
  • Figure 6 shows schematically a winding device for performing the method according to the invention.
  • FIG. 7 serves to compare the invention with the prior art, FIG. 7a representing the winding process according to Example 1 and FIG. 7b a corresponding winding process according to the prior art.
  • Mirror formation is avoided according to the invention with certainty by ensuring that the thread run-up point after Z revolutions has not covered the distance M ⁇ 2H, but the smaller distance M ⁇ 2H-a; the so-called laying distance a - measured from the middle of the thread to the middle of the thread - is greater than the width of the thread lying on it.
  • the critical distance depends on three quantities in accordance with equation (2): x, i, M.
  • the quantity x is derived in accordance with equation (1) from the laying distance a. According to the invention, this is kept as small as possible; it is therefore only slightly larger than the width of the thread lying on it. On the other hand, it is recommended that the drive tolerances are not too small. Depending on the quality and other properties of the drive, a laying distance that exceeds the thread width by several times may be required. For other reasons, too, it is occasionally necessary to choose a distance that is significantly larger than the principle required by the invention. If, for example, in the course of further processing, the thread is pulled off the bobbin at high speed, thread breakage can occur if the laying distance is too small.
  • the distance between a corrected number of turns and the neighboring dangerous mirror value is determined according to equation (2) as a function of the number of turns and the order number, with a constant laying distance, at least corresponding to the thread width, being assumed during the entire winding process .
  • the invention takes advantage of the fact that the critical distances are different depending on the number of turns and atomic number.
  • the dependence on the atomic number is particularly important. According to the width of the critical areas, the higher the atomic number, the lower the probability that the number of turns happens to fall into a certain critical area of higher order. This enables the higher orders to be taken into account without the number of necessary corrections increasing excessively.
  • the laying distance is chosen not greater than twice the thread width.
  • the critical distance is in the range of large numbers of turns, i.e. at the beginning of a coil trip, larger than in the area of low number of turns, i.e. at the end of the coil trip. This is used according to claim 3 by taking higher ordinal numbers into account at the end of the coil travel than at the beginning.
  • mirror values up to at least the fifth order are taken into account in at least one stage.
  • the mirror values can be avoided right up to an atomic number sufficient for the entire coil trip; in such cases, the maximum atomic number up to which the corrections are carried out is kept constant during the entire coil travel.
  • all mirror values are taken into account at least up to the third, preferably at least up to the fourth order.
  • the calculation of the number of turns for the individual stages is carried out using a computer.
  • the basic parameters are entered into the computer. This includes the thread speed, the stroke length, the start and end diameter of the bobbin, the minimum and maximum lay-off angle (or instead the minimum and maximum traversing frequency), the thread laying distance and in particular the dangerous mirror values.
  • the computer determines the number of turns from level to level. It calculates the number of turns i belonging to the maximum frequency of the stage and compares it with the dangerous mirror values. These generally have the form iganz + N M For all dangerous mirror values, the computer has to determine whether the calculated i falls within its critical range, ie whether the distance is smaller than the critical distance given by equation (2): If no, the calculated number of turns i is used. If the inequality (3) is for a certain mirror value all + N ' M ' is satisfied, a corrected number of turns determined. With the corrected number of turns, it becomes the mirror value all + N ' M ' belonging mirror winding avoided with certainty.
  • Two coils 1 are driven by a drive roller 2 on the circumference.
  • the drive roller 2 is rotated by a motor 3.
  • An inverter 4 keeps the motor speed constant at a predetermined value.
  • the coil speed falling in accordance with the increasing diameter of the coils 1 is detected by a speed sensor 5.
  • a corresponding signal is fed to a computer 6.
  • the computer 6 controls the speed of the drive motor 8 of a traversing device 9 via an inverter 7.
  • Examples 1 to 4 serve to further illustrate the mode of operation of the invention. It is understood that relatively simple cases have been selected for this purpose. This should on the one hand clarify the effects and on the other hand avoid overloading the examples and the drawings with confusing details. For this reason, values were used for the laying distance a, which are in the upper edge area of the spectrum customary in practice. Only relatively low atomic numbers were taken into account, although the actual advantages of the invention come into play in many practical cases, especially when considering higher atomic numbers.
  • the coil travel has been chosen to be relatively short in the examples, so that it only comprises 6 to 7 stages. In many practical cases, it comprises about 15-30 levels. The number of turns used and the laying angle are representative of normal practice.
  • the mirrors up to the third order have been taken into account.
  • the size x was chosen to be even larger than in the other examples.
  • the critical areas are particularly wide and the spaces between them are correspondingly narrow.
  • the fourth order was also taken into account - as can be seen from a few dashed fourth-order critical areas - overlaps and bottlenecks would occur.
  • the example illustrates that the avoidance of higher-order mirrors becomes difficult or impossible under unfavorable boundary conditions.
  • the invention still allows the avoidance of mirror windings up to the third order even under the assumed extremely unfavorable conditions.
  • FIG. 7a symbolizes the coil travel according to example 1 in a different representation, in which the current deposit angle is entered on the ordinate.
  • the critical areas of the mirror values are again highlighted by hatching. Their different widths are clearly recognizable.
  • the sawtooth-like working curve drawn with strong, solid lines has a total of six hyperbolic sections, which illustrate the path of the working point in the six stages of the winding process. They run in the spaces between the different critical areas, so that a mirror-free winding is guaranteed without correction.
  • FIG. 7b illustrates a winding process according to the prior art that starts from the same boundary conditions.
  • the width of the forbidden areas with hatching is given by the distance between the mirror values 4 and 4.5. It is the same size for all mirror values.
  • the working curve up to the fourth stage almost coincides with the working curve according to FIG. 7a.
  • the sixth stage begins much earlier than in FIG. 7a.
  • an additional seventh stage is required.
  • a further correction is made to avoid the prohibited area.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Winding Filamentary Materials (AREA)
EP91119040A 1990-11-23 1991-11-08 Verfahren zum Aufspulen eines Fadens in gestufter Präzisionswicklung Expired - Lifetime EP0486896B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4037278A DE4037278A1 (de) 1990-11-23 1990-11-23 Verfahren zum aufspulen eines fadens in gestufter praezisionswicklung
DE4037278 1990-11-23

Publications (2)

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EP0486896A1 EP0486896A1 (de) 1992-05-27
EP0486896B1 true EP0486896B1 (de) 1995-05-24

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EP91119040A Expired - Lifetime EP0486896B1 (de) 1990-11-23 1991-11-08 Verfahren zum Aufspulen eines Fadens in gestufter Präzisionswicklung

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ300399B6 (cs) * 2000-04-20 2009-05-13 W. Schlafhorst Ag & Co. Zpusob výroby krížem vinuté cívky a krížem vinutá cívka
DE10033015B4 (de) * 2000-04-20 2011-01-13 Oerlikon Textile Gmbh & Co. Kg Verfahren zum Herstellen einer Kreuzspule und Kreuzspule

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4223271C1 (pt) * 1992-07-17 1993-06-24 Neumag - Neumuenstersche Maschinen- Und Anlagenbau Gmbh, 2350 Neumuenster, De
DE10015933B4 (de) 2000-03-30 2015-09-03 Saurer Germany Gmbh & Co. Kg Verfahren zum Herstellen einer Stufenpräzisionswicklung
DE10018808A1 (de) * 2000-04-15 2001-10-25 Schlafhorst & Co W Verfahren zum Herstellen von Kreuzspulen
DE102010055575A1 (de) * 2010-12-21 2012-06-21 Oerlikon Textile Gmbh & Co. Kg Verfahren zur Herstellung einer Färbespule

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0093258B1 (de) * 1982-05-03 1986-12-10 b a r m a g Barmer Maschinenfabrik Aktiengesellschaft Verfahren zur Spiegelstörung beim Aufwickeln eines Fadens in wilder Wicklung
DE3521120A1 (de) * 1985-06-13 1987-01-02 Maag Fritjof Spulmaschine und verfahren zum vermeiden von spiegeln beim aufspulen
JPS62290682A (ja) * 1986-06-03 1987-12-17 Teijin Seiki Co Ltd トラバ−ス装置
IT1227912B (it) * 1988-12-23 1991-05-14 Savio Spa Procedimento ed apparecchio per pilotare la distribuzione del filo sull'impacco in formazione in un gruppo di raccolta per fili sintetici
DE3918846A1 (de) * 1989-06-09 1990-12-13 Maag Fritjof Praezisionskreuzspule, verfahren zu deren herstellung und spuleinrichtung dafuer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ300399B6 (cs) * 2000-04-20 2009-05-13 W. Schlafhorst Ag & Co. Zpusob výroby krížem vinuté cívky a krížem vinutá cívka
DE10033015B4 (de) * 2000-04-20 2011-01-13 Oerlikon Textile Gmbh & Co. Kg Verfahren zum Herstellen einer Kreuzspule und Kreuzspule

Also Published As

Publication number Publication date
EP0486896A1 (de) 1992-05-27
DE4037278C2 (pt) 1992-10-01
DE4037278A1 (de) 1992-05-27
DE59105578D1 (de) 1995-06-29

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