WO2023220840A1

WO2023220840A1 - Optimisation of settings of a yarn joining device

Info

Publication number: WO2023220840A1
Application number: PCT/CH2023/000002
Authority: WO
Inventors: Ulf Schneider; Kurt Eggimann
Original assignee: Uster Technologies Ag
Priority date: 2022-05-19
Filing date: 2023-05-17
Publication date: 2023-11-23
Also published as: CH719708A1

Abstract

In a method for optimising settings of a yarn joining device, a sample of yarn joins is produced by the yarn joining device with unchanged settings. Values of at least one parameter of the yarn joins of the sample are measured (313). A characteristic value of the sample is calculated (315) by means of a statistical evaluation of the measured parameter values and assigned to the current settings. The characteristic value is calculated (315) in a vector space spanned by the at least one parameter. A setting of the yarn joining device is changed (317). The preceding steps are repeated for at least one further sample. By comparing the characteristic values of the samples, optimum settings are determined (318). The determined optimum settings are set (319) on the yarn joining device. The method allows more robust, systematic and targeted optimisation of the settings.

Description

OPTIMIZATION OF SETTINGS OF A YARN CONNECTING DEVICE

AREA OF EXPERTISE

The present invention lies in the fields of manufacturing and quality testing of yarns. It relates to a method for optimizing settings of a gaming connection device according to the preamble of the first patent claim. It also relates to a game processing machine according to the preamble of a further independent patent claim.

STATE OF THE ART

Yarn connecting devices, also called piecing machines or splicers, are used on yarn processing machines such as spinning or dishwashers to connect two yarn ends together. In the compressed air splices commonly used for staple fiber games, the fibers of the two game ends to be connected are unbraided with the help of compressed air, mixed together over a certain overlap length and intertwined with the help of compressed air. Optionally, the yarn bonding process can be supported by supplying water and/or heat. A more detailed description of compressed air splices can be found in Carl A. Lawrence, “Fundametals of spun yam technology,” CRC Press LLC, 2003, paragraph 7.7.2. In addition to the compressed air splices, other types of yarn connection devices are known, e.g. B. mechanical splicers in which two rotatable disks twist the two game ends to be connected together.

The quality of gam compounds can be assessed according to different criteria. A first criterion is the visually perceptible geometric expansion of the yarn connection in the axial and radial directions. In particular, the thickness of the chamois compound should be as equal as possible to the thickness of the chamois. The geometric extent or game parameters that correlate with it can be from known ones Gaming monitoring devices such as: B. Gam cleaner can be measured. A second criterion is the tensile strength of the chamois compound, which should be as high as possible. In addition, further criteria can be established.

The quality of the gammon connections is influenced by settings on the gammon connection device. Depending on the type and functionality of the gaming connection device, various setting parameters can be set. The following are examples of important setting parameters for compressed air splices:

• Duration and/or pressure of the air blast emitted to untangle the game ends to be joined;

• Length along which the game ends to be joined overlap for mixing;

• Duration and/or pressure of the air burst that is expelled to intertwine the game ends to be connected.

EP-3,766,815 A1 discloses a yarn winding device and a method for estimating tensile strength. Related information relating to a tensile strength of a gammon bond produced by a gammon bonding device is acquired, e.g. B. a thickness and a length of the yarn connection. A learning model constructed in a learning phase by machine learning using the associated information as input data is saved. In an application phase, the learning model is used to estimate a value of the tensile strength of the yarn connection from the associated information. If the estimated tensile strength or dimensions of the gammon bond are insufficient, the gammon bond is cut from the gam, and settings of the gammon bonder are automatically changed. The pressure and the ejection duration of the compressed air used for the connection process are mentioned as examples of settings of the gaming connection device. The change in settings occurs due to a single insufficient gaming connection.

According to DE-10'2012'103'346 A1, a thread splicing device for connecting thread ends at a winding station of a textile machine has a control unit Control of handling elements of the thread splicing device and a device for testing the strength of the thread connections. Using the device for strength testing, a defined test tensile force can be applied to the thread. The strength testing device is connected to the control unit of the thread splicing device. Depending on the result of the strength test, optimized splicing parameters can be determined automatically, and the thread splicing device can be controlled by the control unit using the optimized splicing parameters.

WO-2015/155705 A1 discloses a method for optimizing several setting parameters for adjusting a thread connecting device for textile machines. The setting parameters are assigned predetermined initial values based on the properties of the thread to be connected. The thread ends are connected. An initial test to check the thread connection is carried out. If the first test is negative, at least one setting parameter is changed and the thread connection and the first test are carried out again. If the result of the first test is positive, the thread connection is marked as acceptable and the corresponding setting parameters are marked as optimized. Alternatively, at least a second test can be carried out.

Furthermore, DE-10'2020T25'938 Al describes a method for determining the

Thread connection quality of a thread connection produced by a thread connection unit of a textile machine as well as a textile machine with a large number of similar bobbin producing workstations for carrying out the method. The inspection unit has at least one optically, acoustically and/or capacitively acting detection means for detecting the thread geometry in the area of the thread connection. A thread strength measuring device can be downstream of the inspection unit. The thread connection can be evaluated in an evaluation unit. The evaluation unit is connected to a control unit, by means of which the thread connection can be optimized in an iterative process by repeatedly changing the textile machine parameters.

None of the above documents provide details on how to optimize the settings of the gaming connection device. The specialist article “Optimizing splicing parameters for splice aesthetics for a filament synthetic yam” by CJ Webb et al., The Journal of the Textile Institute, Vol. 100, No. 2, March 2009, pp. 141-151, describes attempts to influence this of selected setting parameters on the strength and appearance of the splice. It shows that the splice with the highest strength is generally not the splice with the best appearance. As an overall optimum, an acceptable compromise between strength and appearance must therefore be sought. Using a variance analysis, the setting parameters that have the greatest influence on the strength and appearance were determined. Based on this, optimal setting parameter values were determined. The disadvantages of this teaching are that it only takes into account the two splicing parameters strength and appearance and that determining the optimal setting parameter values is complex.

PRESENTATION OF THE INVENTION

It is an object of the present invention to provide a method for optimizing settings of a gaming connection device, which eliminates the disadvantages of the prior art and further develops its teachings. The method should in particular allow for a simpler, more robust, more systematic and more targeted optimization of the settings. It should be as generally applicable as possible and should be able to take into account as many splicing parameters as possible. Another object of the invention is to provide a chamois processing machine for carrying out the method.

These and other objects are solved by the method and the chamois processing machine as defined in the independent patent claims. Advantageous embodiments are specified in the dependent patent claims.

The method according to the invention serves to optimize the settings of a gammon connecting device. It includes the following steps: a) producing a sample of gam bonds by the gam bonding device with unchanged settings; b) measuring values of at least one parameter of the gam compounds of the sample; c) calculating a key figure of the sample by means of a statistical evaluation of the measured parameter values, the calculation of the key figure of the sample taking place in a vector space spanned by the at least one parameter, in which the parameter values of a gaming connection define a vector and the vectors of the sample define a point cloud, and assigning the metric to the current settings; d) changing a setting of the gammon connection device and repeating steps a) to c) for at least another sample of gammon connections; e) Determining optimal settings by comparing the key figures of the samples; and f) adjusting the determined optimal settings on the gaming connection device.

The calculation of the sample key figure and its assignment according to step c) can alternatively be done after instead of before changing the setting according to step d).

According to one embodiment, the yarn splicing device is a compressed air splicer, and the settings of the yarn splicing device are selected from the following set: duration of the jet of air ejected to untangle the yarn ends to be joined; Pressure of the air blast that is expelled to untangle the game ends to be joined; Length along which the game ends to be connected overlap for mixing; Duration of the burst of air that is emitted to intertwine the game ends to be connected; Pressure of the air blast that is expelled to intertwine the game ends to be connected.

The sample should statistically represent the Gam connections made with unchanged settings as well as possible. In any case, it contains more than one gam compound and can contain 30 to 3000, preferably 100 to 1000 and for example 300 gam compounds. The at least one parameter of the chamois compounds can be selected from the following set: length, diameter, diameter deviation from a nominal diameter of the chamois, shape, mass, mass deviation from a nominal mass of the chamois, hairiness, tensile strength.

According to one embodiment, the key figure takes into account a position measure and/or a scatter measure of the point cloud. In this case, those settings are preferably determined to be optimal whose characteristic number indicates a minimum of the positional mass, a minimum of the dispersion mass or a minimum of a mathematical combination of the positional mass and the dispersion mass.

According to one embodiment, the setting of the gaming connection device to be changed can be described by a numerical setting value. Changing the setting can e.g. B. by adding or subtracting an increment to or from the current numerical setting value and / or by multiplying the current numerical setting value by a factor.

According to one embodiment, the setting of the gaming connection device is changed depending on a comparison of already calculated key figures that are assigned to different settings. If e.g. For example, if a change has already been made and resulted in a better metric, it makes more sense to make another change in the same direction rather than in the opposite direction.

According to one embodiment, the determined optimal settings are stored together with a type of yarn processed and used as initial settings when later processing yarn of essentially the same type. The type of chamois is z. B. defined by the yarn material, the yarn count, the manufacturing process, etc.

According to one embodiment, the optimal settings determined are output to an operator. According to one embodiment, the method according to the invention is a computer-implemented method. This means that all process steps are automatically controlled by a computer.

The game processing machine according to the invention includes a game connection device for producing game connections, a game monitoring device for measuring values of at least one parameter of the game connections and a control unit which is set up to carry out the following steps: a) Forming a sample of game connections which are produced by the game connection device with unchanged settings were manufactured; b) storing values measured by the gam monitoring device of the at least one parameter of the gam compounds of the sample; c) calculating a key figure of the sample by means of a statistical evaluation of the measured parameter values, the calculation of the key figure of the sample taking place in a vector space spanned by the at least one parameter, in which the parameter values of a gaming connection define a vector and the vectors of the sample define a point cloud, and assigning the metric to the current settings; d) changing a setting of the gammon connection device and repeating steps a) to c) for at least another sample of gammon connections; and e) determining optimal settings by comparing the key figures of the samples.

According to one embodiment, the control unit is additionally set up to adjust the determined optimal settings on the gaming connection device.

According to one embodiment, the gammon processing machine has a plurality of gammon processing stations, each of which is equipped with a gammon bonding device and a gammon monitoring device, and the sample is formed from gammon compounds produced by gammon bonding devices of different gammon processing stations. According to one embodiment, the yarn processing machine is a spinning machine or a dishwasher.

Thanks to the inventive consideration of samples that are as representative as possible, the settings are optimized in a more robust manner than in the prior art EP-3,766,815 Al. There, the change in settings occurs due to a single insufficient gaming connection and can therefore be triggered by random influences. By also taking several samples into account and each characterizing them by a key figure, the invention allows a systematic and targeted optimization of the settings.

Compared to the teaching of the specialist article “Optimizing splicing parameters for splice aesthetics for a filament synthetic yam” by C.J. Webb et al. the method according to the invention is simpler and more versatile. It can take any splicing parameters into account and does not require any complex variance analysis of the setting parameters. If necessary, it can therefore be designed as an automatic computer-implemented method.

LIST OF DRAWINGS

The invention is explained in detail below with reference to the drawings. Using the example of a winding station in Figures 2 and 3 is not intended to limit the generality of the invention; The invention can be applied analogously to other yarn processing machines such as spinning machines. Using the example of a compressed air splicer should not be seen as a limitation; the invention is analogously applicable to other types of yarn splicing devices such as mechanical splicers.

Figure 1 shows schematically a gaming compound.

Figure 2 shows schematically a winding unit of a dishwasher according to the invention.

Figure 3 shows a flowchart of an embodiment of the method according to the invention.

Figure 4 shows an event field with a point cloud representing parameter values of Gam connections. IMPLEMENTATION OF THE INVENTION

Figure 1 shows a Gam connection 120 in a Gam 110 with a nominal diameter 112. The Gam connection 120 can be characterized by measurable parameters 121, 122. As examples of such parameters 121, 122, a length 121 and an average diameter 122 of the yarn connection 120 are shown in FIG.

The length 121 of the GAM connection 120 can be defined as the length between certain selectable limit diameters in a transition region between the GAM 110 and the GAM connection 120; at the beginning of the Gam connection 120 a limit diameter along the Gam 110 is exceeded and at the end of the Gam connection 120 a limit diameter along the Gam 110 is undershot. To measure the length 121 of the yarn connection 120, known methods can be used, e.g. B. measuring the instantaneous speed of the chamois 110 and determining the length 121 of a chamois section by integrating the instantaneous speeds over a certain period of time. The instantaneous speed can be obtained from a groove drum signal from the yarn processing machine or from a transit time correlation method, as disclosed in EP-1,249,422 A2.

In addition to the diameter 122 or instead of the diameter 122, other parameters such as a diameter deviation of the chamois compound 120 from the nominal diameter 112 of the chamois 110, a mass of the chamois compound 120 or a mass deviation of the chamois compound 120 from a nominal mass of the chamois 110 can be measured. All of these parameters can be summarized under the term “amplitude” of the gaming connection 120. Diameter 122 or diameter deviations are preferably measured by an optical, masses or mass deviations by a capacitive Gam sensor.

Other parameters of the game compound 120 can describe its shape. “Shape” here is understood to mean a course of the diameter or the mass of the chamois compound 120 depending on the location on a longitudinal axis of the chamois 110. In Figure 1, a slight decrease in the diameter in the middle of the yarn connection 120 is indicated, see above that the shape of the gam compound 120 is reminiscent of the letter M. The person skilled in the art is able to specify suitable parameters for describing the shape, for example amplitudes and positions of local maxima and/or minima, etc.

Figure 2 shows schematically a winding unit 200 of a dishwasher according to the invention. This shows a cop 211, from which yarn 210 is unwound and wound onto a spool 212. When winding, the yarn 210 moves in the direction of an arrow 213, i.e. from bottom to top in the illustration in FIG. In the running direction 213 of the chamois 210, along a path of the chamois 210 are a chamois connecting device 220 for connecting two game ends, a speed measuring device 231 for measuring an instantaneous speed of the chamois 210, a cutting device 232 for removing unacceptable defects from the chamois 210 and a chamois monitoring device 233 for measuring of parameters of the Gams 210 arranged. These four devices 220, 231-233 are known per se and are therefore not described in more detail here.

An evaluation unit 234 is connected to the speed measuring device 231 and the video monitoring device 233 via lines 235 and 237, respectively. In particular, it calculates the length 121 of a chamois connection 120 (see FIG. 1) from the time duration of the passage of the chamois connection 120 measured in the chamois monitoring device 233 and the speed of the chamois 210 measured in the speed measuring device 231. The evaluation unit 234 is connected via a line 236 to the Cutting device 232 connected to which it can give commands to separate the chamois 210. The game monitoring device 233, the cutting device 232, the evaluation unit 234 and possibly also the speed measuring device 231 can be integrated in a measuring head 230 of an electronic game cleaner. Alternatively, the speed measuring device 231 can be integrated into the dishwasher, so that in this case the dishwasher supplies a speed signal to the evaluation unit 234.

The evaluation unit 234 is connected via a line 262 to a winding station computer 260, which in turn is connected to the yarn connecting device 220 via a line 261. The evaluation unit 234 receives information from the gaming monitoring device 233 Information about impermissible defects in the yarn 210. When such information is received, the evaluation unit 234, on the one hand, triggers a cutting of the chamois 210 by the cutting device 232, and on the other hand, it informs the winding station computer 260 about the cut that has been triggered, whereupon the winding station computer 260 rewinds a last one to the Coil 212 wound yarn section caused. The defective yarn section is cut off by scissors on the yarn joining device 220. The winding station computer 260 then triggers the two game ends to be connected by the yarn connection device 220.

A control unit 240 is connected to the evaluation unit 234 via a line 238. The control unit 240 controls and informs the evaluation unit 234 and other elements, as described below. It receives various data and/or information from the evaluation unit 234 and processes it. This includes information about cuts made by the cutting device 232; it may also include data on game quality and/or game connection quality. Preferably an output unit

241, e.g. B. a screen for inputting or outputting data and/or an input unit

242, e.g. B. a keyboard, a computer mouse or the like, connected to the control unit 240 or integrated into it. The output unit 241 and the input unit 242 can be combined in a touch screen.

A typical dishwasher has a large number of winding stations 200. The control unit 240 is preferably connected to several measuring heads 230, which are located at several different winding stations 200. It also communicates via a line 243 with a machine control unit 250 of the dishwasher. The machine control unit 250 is in turn connected to several winding station computers 260 via lines 251.

The lines 235-238, 243, 251, 261, 262 can be wired or wireless.

Figure 3 shows a flowchart of an embodiment of the method according to the invention. The execution of the method can e.g. B. essentially be controlled by the control unit 240 (see Figure 2). The method can be carried out on a single winding unit 200 or on several winding units 200 that process the same yarn type and whose gaming connection devices 220 have the same settings.

Initially, certain initial settings are set 311 on the yarn connecting device 220. Examples of important setting parameters for compressed air splices are the ejection duration and/or the pressure of the air blast for untangling the gamends, the overlap length for mixing the gamends, and the ejection duration and/or the pressure of the air blast for intertwining the gamers. In addition, there may be other setting parameters that influence the quality of the gaming connection 120. The setting 311 of the yarn connecting device 220 can be carried out at the command of the control unit 240 via the machine control unit 250 and the winding station computer 260 (see FIG. 2).

The initial settings can e.g. B. depend on the type of Gam 210 to be processed and can be taken from a database.

A sample of gam bonds 120 is produced by the gam bonding device 220. Gam 210 must always be processed with the same properties, and the settings of the Gam connection device 220 must not be changed. In detail, when producing the sample, a gam connection 120 is produced 312 by the gam connection device 220. Parameter values of the gam connection 120 are measured 313 by the gam monitoring device 233. A gam connection 120, whose parameter values do not meet predetermined quality criteria, can be removed from the gam 210 by the cutting device 232 be cut out and replaced by a new yarn connection 120 produced by the yarn connection device 220. These processes 312, 313 are repeated until the sample is complete. A sample should be as statistically representative as possible and can e.g. B. 30 to 3000, preferably 100 to 1000 and for example 300 gam compounds 120.

If there is a complete sample, at least one key figure of the sample is calculated 315 by the control unit 240. The calculation 315 of the key figure is carried out by means of a statistical evaluation of the measured parameter values in one Vector space. The key figure should be a measure of the quality of the game compounds 120 contained in the sample. Examples of the vector space and the key figures are given in Figure 4. The key figure and the current settings are assigned to each other and stored, for example in a database.

Thereafter, at least one setting of the gaming connection device 220 is changed 317. Which setting this is can be randomly selected or determined according to a predetermined scheme. If the setting to be changed can be described by a numerical setting value, the setting can be changed 317 by adding or subtracting an increment to or from the current numerical setting value and/or by multiplying the current numerical setting value by a factor. The change 317 of the setting can e.g. B. on the command of the control unit 240 via the machine control unit 250 and the winding station computer 260 (see Figure 2).

The previously described steps 312-317 are repeated with the changed settings, as illustrated in Figure 3. In this way, another sample is created with different settings, which is characterized by its own additional key figure.

A number of samples can be created, each of which is characterized by its own additional key figure. Preferably, at least three samples are produced for each setting parameter with different values of the setting parameter and characterized by key figures. With the three setting parameters mentioned above, unbundling, overlapping and intertwining, this results in at least 3 ³ = 27 samples and key figures.

If there are several already calculated key figures, the changing 317 of the setting can take place depending on a comparison of the already calculated key figures assigned to different settings. This can be particularly advantageous if a single setting parameter is to be varied. The variation or change 317 can then be made specifically in the direction (ie increase or decrease of the numerical setting value) in which a further improvement in the key figure can be expected based on the already calculated key figures. If change 317 actually leads to an improvement in the key figure, another one can be made Amendment 317 should be made in the same direction. Otherwise, a (at least local) optimum of the Gam connections index 120 was found, which is the actual goal of the variation.

If a sufficient number, and at least two, samples have been produced and their settings have each been characterized by a key figure, the optimal settings are determined 318 based on the calculated key figures, for example by the control unit 240. The determination 318 of the optimal settings depends on the definition of the key figure from, which will be discussed in more detail on the occasion of Figure 4. It can e.g. B. those settings to which the smallest or largest key figure is assigned, or those settings where the key figure assumes an at least local extremum (minimum or maximum).

The optimal settings determined can be saved together with a type of chamois processed, e.g. B. in a database. Suitable initial settings can later be found from such a database when processing yarn of essentially the same type. This has the advantage that the initial settings are close to the optimum and thus high-quality gaming connections are created right from the start.

In a final step 319, the determined optimal settings are set on the yarn connecting device 220.

According to a first alternative, the setting 319 is done manually by an operator. For this purpose, the determined optimal settings are output to the operator on the output unit 241.

According to a second alternative, the setting 319 takes place automatically on the command of the control unit 240, e.g. B. via the machine control unit 250 and the winding station computer 260. Even in this completely computer-implemented embodiment, it is advantageous to output the determined optimal settings to the operator on the output unit 241. The operator can be asked on the output unit 241 to enter the determined optimal settings on the input unit 242 to confirm or reject. Such human control of the automatically determined results can prevent obviously unsuitable or nonsensical settings being set on the yarn connecting device 220 and thus poor quality yarn 210 being produced.

Figure 4 shows a so-called event field 400, which is known per se for representing game events. The event field 400 includes a quadrant or part of a quadrant of a two-dimensional Cartesian coordinate system. Along a first axis 401, e.g. B. the abscissa is the first parameter 121 and along a second axis 402, e.g. B. the ordinate, the second parameter 122 is plotted on a gaming compound 120. As described above, e.g. B. the first parameter 121 be a length and the second parameter 122 an amplitude (i.e. diameter, mass, etc.) of a gaming compound 120. A horizontal straight line 403 in the diagram 400 can indicate a nominal amplitude 112 of the chamois 110, from which the amplitude 122 of a high-quality chamois compound 120 should deviate as little as possible.

The values of the first parameter 121 and the second parameter 122, which were measured for a Gam connection 120, are entered into the event field 400 as coordinates of the Gam connection 120. A game connection 120 is represented by a graphic symbol 421, e.g. B. a point, which is at the location that corresponds to the coordinates of the game connection 120. According to the invention, values of the parameters 121, 122 are measured for a sample of gam compounds 120. The totality of the points 421 representing the sample forms a point cloud 420.

Some possibilities are discussed below as to how the sample or the corresponding settings of the gaming connection device 220 can be characterized using a key figure, i.e. H. Step 315 in the flowchart of Figure 3. The possibilities can be applied alternatively or cumulatively.

A first possibility is that the key figure takes a position measure 422 of the point cloud 420 into account. Such a position measure can e.g. B. be a focus 422 of the point cloud. As is known, the location vector r _s of the center of gravity 422 is calculated according to the following formula: rs= ^? ₌₁ r _t , where r ₍ denotes the location vectors of points 421 and n denotes the size of the sample (number of location vectors r _t or points 421).

Alternatively, the two coordinates 401, 402 can be weighted differently for the position measure. The deviation of the amplitude 122 (ordinate 402) of the chamois connection 120 from the nominal amplitude 112 (line 403) of the chamois 110 can z. B. be weighted higher than the length 121 (abscissa 401) of the gam connection 120.

A second possibility for characterizing the sample is that the key figure takes into account a dispersion measure 423 of the point cloud 420. Such a dispersion measure 423 can e.g. B. be an empirical standard deviation of the point cloud 420. The empirical standard deviation s is z. B. calculated according to the following formula:

Other scattering measures such as the coefficient of variation or the mean absolute deviation are known to those skilled in the art.

In Figure 4, the amount of dispersion is indicated by a circle 423, the center of which is the center of gravity 422 and whose radius corresponds to the amount of dispersion. Instead of a circle, for example, an ellipse can be used for graphical representation, the two main axes of which represent two different scattering masses. When it comes to the dispersion measure, the two coordinates can also be weighted differently, with the dispersion of the amplitude 122 (ordinate 402) of the gammon connection 120 preferably being weighted higher than the dispersion of the length 121 (abscissa 401) of the gammon connection 120.

Only the position measure 422, only the dispersion measure 423 or a mathematical combination of the two measures 422, 423 can be included in the key figure. In the latter case can it is a linear combination of the position mass 422 and the scatter mass 423, whereby the two masses 422, 423 can be weighted differently. Instead of a linear combination, any other mathematical combination can be used as a key figure. In any case, the different variables can have different effects on the key figure, which can be achieved using weights and/or mathematical functions such as powers. In an embodiment with three variables, e.g. B. the amplitude 122 (first position measure) has the strongest effect, the length 121 (second position measure) has the second strongest effect and the standard deviation 423 (dispersion measure) has the least impact.

The event field 400 can be divided into several classes 410. In the example of Figure 4, the classes 410 are adjacent rectangles. The rectangles 410 are delimited from one another by straight class boundaries 411, 412, which are parallel to the first axis 401 and the second axis 402, respectively. In the exemplary embodiment of Figure 4 there are 4x5 = 20 classes 410; other subdivisions with different shapes and/or a different number of classes 410 are possible. A gaming connection 120 is classified into one of the classes 410 if the coordinates (point 421) of the gaming connection 120 lie in the relevant rectangle 410.

The game compounds 120 or points 421 lying in one or more classes 410 can be counted. Their number also characterizes the sample and can therefore be used to calculate the key figure. For this purpose, the ratio of the gam compounds 120 in the relevant class 410 to the total number of gam compounds 120 in the sample (point cloud 420) is preferably specified. As a key figure, for example: B. the proportion of gam compounds 120 can be used in a single, specific class 410. Alternatively, e.g. B. a linear combination of the proportions of gaming compounds 120 in several different, specific classes 410 serve as a key figure, whereby the different classes 410 can be weighted differently.

In the mathematical expression familiar to those skilled in the art, it can be said that the event field 400 represents a vector space spanned by the first parameter 121 and the second parameter 122. Therein, the parameter values of a Gam connection 120 (ie the coordinates of the corresponding point 421) define a vector. The vectors of the sample define the point cloud 420. In this view, it is particularly easy to see that the invention is not limited to two parameters 121, 122 of the gaming connection 120, but can be generalized to any number of parameters. The number of parameters corresponds to the dimension of the vector space. So a single parameter, e.g. B. the amplitude 122 of the gaming connection 120 can be used to calculate the key figure. In another embodiment, three parameters can be included in the calculation of the key figure, e.g. B. the length 121, the amplitude 122 and a hairiness of the chamois connection 120. A tensile strength of the chamois connection 120 is also a parameter that can be taken into account when calculating the key figure.

A graphical representation of the event field 400 with the point cloud 420 and possibly further elements such as the position measure 422 and/or the scatter measure 423 can be output to an operator on the output unit 241. Likewise, the numbers of game compounds 120 belonging to each class 410 and/or their proportions can be output to an operator instead of or in addition to the graphical representation of the event field 400 on the output unit 241. These outputs can occur for all samples, for some selected samples, or only for the sample assigned to the optimal settings. They can support the operator in deciding whether or not to set the determined optimal settings on the gaming connection device. They therefore represent advantageous embodiments of the invention.

Of course, the present invention is not limited to the embodiments discussed above. With knowledge of the invention, the person skilled in the art will be able to derive further variants which are also part of the subject matter of the present invention. REFERENCE SYMBOL LIST

110 gams

112 nominal diameter of the chamois

120 gam compound

121 Length of the gam connection

122 mean diameter of the chamfer connection

200 winding position of a dishwasher

210 yarn

211 cops

212 coil

213 direction of the chamois

220 Gam connection device

230 measuring head of a chamois cleaner

231 Speed measuring device

232 cutting device

233 Gam Monitoring Device

234 evaluation unit

235-238 lines

240 control unit

241 output unit

242 input unit

243 line

250 machine control unit

251 line

260 winding station calculator

261, 262 lines

311 Set initial settings on game connection device

312 Establish game connection

313 Measure parameter values of the Gam connection

314 Is the sample complete?

315 Calculate key figure of the sample

316 Are further settings planned?

317 Change the setting of the game connection device

318 determine optimal settings

319 Set optimal settings on the game connection device

400 event field

401 abscissa

402 ordinates

403 horizontal straight line

410 class

411, 412 class boundaries

420 point cloud

421 point

422 location measure of the point cloud

423 scattering measure of the point cloud

Claims

PATENT CLAIMS

1. A method for optimizing settings of a gaming connection device (220), comprising the following steps: a) producing a sample of gaming connections (120) by the gaming connection device (220) with unchanged settings; b) measuring (313) values of at least one parameter (121, 122) of the gam compounds (120) of the sample; c) calculating (315) a key figure of the sample by means of a statistical evaluation of the measured parameter values, the calculation (315) of the key figure of the sample taking place in a vector space spanned by the at least one parameter (121, 122), in which the parameter values of a game connection (120) defining a vector and the vectors of the sample a point cloud (420), and assigning the key figure to the current settings; d) changing (317) a setting of the gammon connection device (220) and repeating steps a) to c) for at least one further sample of gammon connections (120); e) determining (318) optimal settings by comparing the key figures of the samples; and f) adjusting (319) the determined optimal settings on the gaming connecting device (220). . The method of claim 1, wherein the yarn splicer (220) is a pneumatic splicer and the settings of the yarn splicer (220) are selected from the following set: duration of the blast of air ejected to disentangle the ends to be spliced; Pressure of the air blast that is expelled to untangle the game ends to be joined; Length along which the game ends to be connected overlap for mixing; Duration of the burst of air that is emitted to intertwine the game ends to be connected; Pressure of the air blast that is expelled to intertwine the game ends to be connected.

3. Method according to one of the preceding claims, wherein the sample contains 30 to 3000, preferably 100 to 1000 and for example 300 gam compounds (120).

4. The method according to any one of the preceding claims, wherein the at least one parameter (121, 122) of the chamois compounds (120) is selected from the following set: length (121), diameter (122), diameter deviation from a nominal diameter of the chamois, shape, Mass, mass deviation from a nominal mass of the chamois, hairiness, tensile strength.

5. Method according to one of the preceding claims, wherein the key figure takes into account a position measure (422) and/or a dispersion measure (423) of the point cloud (420).

6. The method according to claim 5, wherein those settings are determined to be optimal whose characteristic number is at a minimum of the positional measure (422), at a minimum of the dispersion mass (423) or at a minimum of a mathematical combination of the positional measure (422) and the dispersion mass ( 423).

7. The method according to any one of the preceding claims, wherein the setting of the gaming connecting device (220) to be changed can be described by a numerical setting value. . Method according to claim 7, wherein changing (317) the setting is carried out by adding or subtracting an increment to or from the current numerical setting value and/or by multiplying the current numerical setting value by a factor. . Method according to one of the preceding claims, wherein the changing (317) of the setting takes place depending on a comparison of already calculated key figures that are assigned to different settings. 0. Method according to one of the preceding claims, wherein the determined optimal settings together with a type of processed chamois (110, 210) can be saved and used as initial settings when later processing yarn (110, 210) of essentially the same type.

11. The method according to any one of the preceding claims, wherein the determined optimal settings are output to an operator.

12. The method according to any one of the preceding claims, wherein the method is a computer-implemented method.

13. Gam processing machine with a Gam connection device (220) for producing Gam connections (120), a Gam monitoring device (233) for measuring values of at least one parameter (121, 122) of the Gam connections (120) and a control unit (240) which is used to carry out the the following steps are set up: a) forming a sample of gam compounds (120) from the

Gam connection device (220) was manufactured (312) with unchanged settings; b) storing values measured (313) by the gaming monitoring device (233) of the at least one parameter (121, 122) of the gaming compounds (120) of the sample; c) calculating (315) a key figure of the sample by means of a statistical evaluation of the measured parameter values, the calculation (315) of the key figure of the sample taking place in a vector space spanned by the at least one parameter (121, 122), in which the parameter values of a game connection (120) defining a vector and the vectors of the sample a point cloud (420), and assigning the key figure to the current settings; d) changing (317) a setting of the gammon connection device (220) and repeating steps a) to c) for at least one further sample of gammon connections (120); and e) determining (318) optimal settings by comparing the key figures of the samples. Chamois processing machine according to claim 13, wherein the control unit (240) is additionally set up for adjusting (19) the determined optimal settings on the chamois connecting device (220). A chamois processing machine according to claim 13 or 14, wherein the chamois processing machine comprises a plurality of chamois processing stations (200), each of which is equipped with a chamois compounding device (220) and a chamois monitoring device (233), and the sample is formed from chamois compounds (120) obtained from Gam connecting devices (220) from various Gam processing locations (200) were manufactured. A yarn processing machine according to any one of claims 13-15, which yarn processing machine is a spinning machine or a dishwasher.