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
• • 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
  • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
  • B65H2511/20—Location in space
  • B65H2511/21—Angle
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
  • B65H2511/20—Location in space
  • B65H2511/22—Distance
  • B65H2511/222—Stroke
• • 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 the formation of thread spools, in particular according to claims 16 and 17, or a method for operating a thread winding machine and a winding device according to the preamble of the first method and the first device claim.
• a to-and-fro faderi guide primarily feeds the thread onto a thread transfer roller, which can also be a tachometer roller, and deposits it on a bobbin
• the thread is dragged back and forth by the thread guide is, that is, the thread leader hurries ahead of the thread.
• This creates a so-called drag error, which depends on the speed of the thread guide, the distance between the thread guide and the thread transfer roller, the friction between the thread and the tachometer roller surface and the air friction of the thread.
• the thread transfer roller is usually a speedometer roller and is referred to as such in the following, without restricting effect.
• a step precision winding is formed, one begins with a predetermined crossing angle per step, which decreases in the course of the step, that is to say as the diameter of the bobbin increases and thus the rotational speed of the bobbin and thus the speed of the thread guide decrease.
• the speed of the thread guide is higher at the beginning of the stage than at the end of the stage, so that the following error is greater at the beginning of the stage than at the end of the stage and accordingly the bobbin width at the end of the stage is greater than at the beginning of the stage. Since such a coil is formed with several stages, the
• BESTATIGUNGSKOPIE End faces of the coil seen in cross section, an end face with a saw tooth cross section.
• This sawtooth cross-section has the disadvantage that the thread layers have a tendency to slip against the spool sleeve over the end face, so that a so-called tension thread is created, which leads to problems in further processing of the spool and is therefore undesirable.
• the invention solves the problem in that the lag error, especially jumps in the lag error, are corrected in such a way that the end faces of the coil essentially form a plane.
• the method and the device are not dependent on the type of traversing method, which means that the method or the device can be carried out or carried out with a traversing device with a grooved drum or with a wing or with a belt or with a traversing pointer.
• Grooved drum switching for example in DE 26 27 643, wing swinging in EP 0622 3-24 A.1 and pointer switching in DE 19846 138.0 and EP 0838 4-22 A.1 are shown and described.
• a further traversing device by means of which the transfer point of the thread to the tachometer roller can be changed, similarly as is possible with pointer maneuvering, is shown and described in WO 00/17082.
• two counter-rotating disks are provided, on each of which three radially advancing and retracting thread guides are arranged, which are arranged on the rotating disks so as to be radially movable and in each case in the corresponding manner Moment when the thread is taken over and moved back when the thread is dispensed.
• Figures 1, 2, 4, 8, 9 always show the same traversing device, but with variations, a figure number with an additional identifier "a” schematically showing the thread course from a central thread guide to a traversing thread guide in different positions and via a take-up roller on a spool and a figure number with the identifier "b" show the sections of the speedometer roller and spool surface touched by the thread in the development. All Figures 1, 2, 4, 9 and 10 show a semi-schematic representation of the traversing device and the differences between the figures are based on differences in the thread guide.
• FIG. 3 shows the relationship between crossing angle and following error
• FIG. 5a shows a speed and time profile of the thread guide
• FIG. 5b the depositing of the thread at the reversal point of the thread on the bobbin
• FIG. 7 shows in cross section part of an end face of a coil which was formed with a step precision winding according to FIG. 6a.
• Figure 7 shows the coil partially in cross section.
• Figure 10 is a control scheme for performing the inventive method.
• FIG. 1 shows with FIG. 1a a bobbin tube 1, on which a bobbin 2 with a thread F is formed.
• the thread F comes from any source (spinning beam or bobbin) through a central thread guide D and through a thread guide 4, which is shown here in positions CO to C.3, to illustrate how the thread runs from the central thread guide D to to coil 2.
• the thread guide stroke Hch extends from one end position C.O to the other end position C.3. It is also shown that the thread can be dragged by the thread guide in the corresponding lifting direction, that is to say that the distance Hp between two reversal points (see also FIG. 2a) of the thread on a tachometer roller 3 is smaller than the thread guide stroke Hch.
• the so-called drag length between the thread guide and a thread take-up line 6 on the tachometer roller 3 is identified as the drag length 5.
• this length is given in the direction shown, although the exact length is basically greater due to the inclined position of the thread shown in FIGS. 1a and 1b.
• FIGS. 1a and 1b are semi-schematic representation, and accordingly the point at which the thread runs up is on the Coil in Figure 1b as a projection, while this is shown in Figure 1a as a development.
• Figure 2 shows with Figure 2a the position of the thread F in the two reversal areas of the traversing thread guide 4, i.e. in position C.O and C. 3, i.e. in end positions with the corresponding following errors S, in position C4, i.e. in the neutral position without following error S and in the following positions C.5 and C.6 in the opposite direction.
• FIG. 3 shows that with a larger crossing angle ( ⁇ 2 instead of 1) the following error S is also larger.
• FIG. 5a shows the speed curve Vch as a function of the time t of a thread guide 4 during the back-and-forth stroke, but completely theoretically, since the change in the end points W only takes place with a finite deceleration or acceleration. Accordingly, as shown in FIG. 5b, the filing of the thread is not, as also shown in FIG. 2a, according to the theoretical course Wth, but according to the practical course of the thread at the end of the stroke according to Wr.
• the 2Abw mark represents the winding of the spool.
• FIG. 6 shows in the upper part the course of the crossing angle ⁇ with increasing coil radius R, that is, a course between the crossing angles ⁇ 2 and ⁇ 1 when building a step precision winding.
• the lower part of FIG. 6 shows the course of the following error S resulting from the course of the crossing angle ⁇ ( ⁇ 2 - ⁇ ), that is to say that with a decreasing crossing angle the following error also decreases, which on the other hand means that the coil width Hp increases with the same traversing stroke Hch and thereby assumes the sawtooth profile shown in Figure 7.
• the end faces of the coils are formed in cross section with a sawtooth profile without application of the invention, which is shown in FIG.
• FIGS. 8 and 9 each show a variant in order to avoid the sawtooth structure mentioned.
• FIG. 10 schematically shows a control system for implementing the invention with the aid of traversing devices, as mentioned at the beginning.
• Box 8 shows an operating data input, that is, an input 10 for the crossing angle ⁇ and an input 11 for the stroke width Hp into a correction computer 9 with a target stroke computer 13, an interpolation computer 14 and a following error table 15.
• the input 10 is made in the interpolation computer 14 and the input 11 in the target stroke computer 13.
• the interpolating computer 14 outputs its signal 12 as a following error input into the target stroke computer 13.
• This adds up the values “11” and “12” and calculates the signal 16 as the thread guide stroke width Hch and puts this width into a traversing system 17 which corresponds to one of the aforementioned traversing systems.
• the stroke width Hp and the course of the crossing angle as a function of the coil diameter are of particular importance.
• the correction calculator receives the value for the desired stroke width Hp (width or length of the coil). To do this, it adds the calculated following error and thus forms the setpoint "stroke width Ch" for the traversing system.
• the traversing system must now be able to actually maintain the setpoint "stroke width Ch". This happens depending on whether the traversing point of the thread guide, the location of the thread transfer or the towing length is changed with the traversing system, depending on a suitable aforementioned traversing system ,
• the lag error is determined experimentally offline. These values are stored in Table 15.
• the interpolation computer 14 receives the actually desired value of the crossing angle ⁇ with the associated following error S from the table, determines the correction value 12 for the target stroke computer 13, which calculates the target stroke for the stroke width 16.
• the same procedure can be based on the traversing speed instead of the crossing angle.
• the resulting coil has a constant stroke width Hp even with a changing crossing angle and thus no sawtooth structure as shown in FIGS. 7 and 8.
• This method is able to determine the associated following error without delay in the event of jumps in the crossing angle (as required, for example, with step precision winding).
• the traversing system then receives a setpoint jump for the stroke width Hch. If the traversing system can now follow this setpoint jump without delay, coils with flat end faces (no sawtooth structure) are formed.
• a bobbin can be viewed abstractly as a set of properties, such as Structure (e.g. cheese or parallel windings; wild winding, precision winding or step precision winding), diameter, thread length, density, but also shape, for example cylindrical, conical, biconical.
• Structure e.g. cheese or parallel windings; wild winding, precision winding or step precision winding
• diameter e.g., a "cylindrical" coil deviate from the ideal image because of the formation of hard shoulders or because of the so-called bulge.
• the set of properties of the coil is in itself a complex concept. He has definitely some structural properties such applications the crossing angle of the Fadenwin ⁇ , as well as properties such from the combination or the course structural properties arise. However, it can also include other properties. that express themselves in the running behavior of the spool in a specific processing environment.
• a spool is created by a winding or winding system.
• the spool system can be viewed abstractly as a set of operating parameters that are individually adjustable to affect the properties of the spool.
• Such operating parameters include the speed of the dome, the contact pressure of the contact roller, the thread guide speed, etc.
• An important operating parameter of the known winding systems is the stroke width of the thread guide. This stroke width is related to the stroke width of the spool, but not the same.
• winding systems in particular traversing of the winding systems, have become known which simplify the adjustability of the stroke width of the thread guide.
• PCT / CH 00/00552 we therefore point out the importance of the setpoints for the reversal points of the movements of the thread guide as adjustable operating parameters. These setpoints define (for the traversing or for the thread guide) a “virtual” stroke width that can be changed in order to be able to influence the effective (“real”) stroke width.
• the complete description of PCT / CH 00/00552 is hereby integrated into the present description.
• a concrete application of the invention according to claim 16 is provided in the formation of coils by means of the so-called step precision winding.
• This method can be seen, for example, from EP-A-629174 together with the prior art mentioned therein.
• An essential feature of the method is the targeted, repeated, abrupt change in the crossing angle in the course of the winding travel (cf. FIG. 6 from EP-A-629174).
• This change in the crossing angle which is essential for the formation of a step precision winding, has an undesirable side effect (disturbing effect) on the coil shape, as was explained above with reference to FIG. 7.
• it is now provided to change the operating parameter "setpoint for the set reversal point of the thread guide" at selected points within the winding cycle.
• This operating parameter can advantageously be used to compensate for the disturbing effects of (in itself) changes in some other operating parameters, provided that these disturbing effects are expressed in a change in the stroke width (and the spool), since a change in the set reversal points of the thread guide is practically exclusive printed out in a change in the stroke width on the coil.
• stroke shortening is to be calculated - meaning the shortening of the stroke width of the thread layers (bobbin property), which arises from the so-called drag error.
• the path curve of the thread guide (operating parameters of the winding system) and the deposit point of the thread are also to be determined. On the basis of these calculations, it should be possible to optimize any desired coil structure.
• the calculation of the stroke shortening can only be carried out by means of a model calculation, since no sensors are available today, with which the effective drop point (or the effective stroke shortening) can be determined. For this reason, it is a preferred feature of the present invention that the changes in the correction quantity are carried out in a controlled manner (not regulated), specifically on the basis of empirical determinations which lead to the definition of predetermined corrective measures in the control program.
• the invention thus comprises a control program for winding a thread into a bobbin (package) by means of a bobbin system with operating parameters that can be adjusted in a controlled manner, wherein at least one parameter is changed during the bobbin travel to influence a property of the bobbin, characterized in that a second operating parameter (“correction quantity "or” compensation or compensation variable ”) can also be changed in a controlled manner during the winding cycle in order to counteract a disruptive effect of the change in the first-mentioned operating parameter.
• the invention naturally also includes a corresponding control or a winding system with such a control program.
• EP-A-1070676 deals with the "stroke shortening". However, this size is complex in the sense that it represents the sum of various individual disturbing effects. The main disturbing effect is generated by changing the crossing angle or traversing speed. Others Interferences can arise from the fact that the distance between the contact roller and the coil (see, for example, EP-B-94483; EP-B-654550 or EP-B-618165) or the contact pressure of the contact roller on the coil is changed.
• the invention according to claim 17 thus also includes a control program for winding a thread into a bobbin (pack) by means of a bobbin system, which results in a shorter stroke, characterized in that the stroke width of the traversing movement is changed by changing the reversal points of the thread guide during the winding travel can counteract the stroke shortening.
• the invention naturally includes a corresponding control or a winding system with such a control program.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Winding Filamentary Materials (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

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Cited By (3)

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Citations (5)

• 2002
  • 2002-04-17 EP EP02713988A patent/EP1379462B1/de not_active Expired - Lifetime
  • 2002-04-17 JP JP2002581304A patent/JP2004521048A/ja not_active Withdrawn
  • 2002-04-17 DE DE50208951T patent/DE50208951D1/de not_active Expired - Fee Related
  • 2002-04-17 WO PCT/CH2002/000213 patent/WO2002083538A1/de not_active Application Discontinuation
  • 2002-04-17 CN CNB028021185A patent/CN1315710C/zh not_active Expired - Fee Related

Patent Citations (5)

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