Title of Invention	"DEVICE AT A DRAFT REGULATOR FOR FIBROUS MATERIAL FOR DIRECT DETERMINATION OF VALUES FOR THE INSERTION POINT OF AUTO LEVELLER"
Abstract	1. In a method of directly determining setting values for an application point of regulation in a draw unit for drafting sliver; the method including the steps of obtaining a plurality of measured values of a quality-characterizing magnitude of the drafted sliver; utilizing the measured values for formulating a function having a minimum constituting an optimal application point of regulation for controlling the draw unit; determining the optimal application point of regulation in a pre- operational run of the draw unit; the improvement comprising the steps of obtaining measured values of at least two quality-characterizing magnitudes based on a drafted sliver portion; combining values of the quality-characterizing magnitudes at the sliver, which correspond to one another with respect to the application point of regulation, to a quality-characterizing number QK, and forming a function based on several numbers QK; said function having a minimum corresponding to an optimal application point of regulation Ropt.

Title of Invention

"DEVICE AT A DRAFT REGULATOR FOR FIBROUS MATERIAL FOR DIRECT DETERMINATION OF VALUES FOR THE INSERTION POINT OF AUTO LEVELLER"

Abstract

1. In a method of directly determining setting values for an application point of regulation in a draw unit for drafting sliver; the method including the steps of obtaining a plurality of measured values of a quality-characterizing magnitude of the drafted sliver; utilizing the measured values for formulating a function having a minimum constituting an optimal application point of regulation for controlling the draw unit; determining the optimal application point of regulation in a pre- operational run of the draw unit; the improvement comprising the steps of obtaining measured values of at least two quality-characterizing magnitudes based on a drafted sliver portion; combining values of the quality-characterizing magnitudes at the sliver, which correspond to one another with respect to the application point of regulation, to a quality-characterizing number QK, and forming a function based on several numbers QK; said function having a minimum corresponding to an optimal application point of regulation Ropt.

Full Text	Device at a draft regulator for fibrous material for direct determination of values for the insertion point of auto leveller. The Innovation pertains to a device at a draft regulator for fibrous material for direct determination of setting (control) values for the insertion point of draft regulator, in case of which the control of the drafting frame adjustable in the draft by the card sliver displays at least one anticipatory control, in order to change the draft of the card sliver, where with the help of drafted (stretched) card sliver several test data of a quality indicating dimension, as CV-value, are receivable and are withdrawable towards determination of a function, whose minimum results an optimal insertion point of draft regulator for the control of the draft and the optimised insertion point of draft regulator is determinate in a propulsive testing or adjusting run of the drafting (drawing frame). The insertion point of auto 1evel1er is an important setting dimension at the draft, in order to produce card sliver with a sliver high card/uniformity, that means, with a low CV-value. In a known device and in a propulsive setting (adjusting) run the card sliver between middle rolls and feed rolls (delivery roll) of the drafting system (device) are drafted and are withdrawn by Calandar rolls, at which a measuring device for the CV-value of the drafted card sliver is connected. In the propulsive adjusting run a multiple of CV test data are determined, which represent a quality indicating measure, relating to the drafted card sliver. With the help of this several test data a functional run is determined, whose minimum corresponds with that value, which promises the best matching of the regulation at the actual card sliver. The several test data, 2 which are indicated, and with which the functional run is determined, are measured at one, in each case, other adjusting value of the regulation, so that for the definition of the to be evaluated functional run a self incrementally changing parameter, for example, the insertion point of auto leveller of the "electronic memory", is to be collated/ with each of its increment value to one of the/data. Disadvantageous is, that the quality of the card sliver (feed quality) running-in in the drafting system and unstretched cannot be taken into consideration. Besides that, it is disturbing, that only a certain, that means, a similar CV-value is requisitioned. The innovation takes, therefore, the task as the basis to arrange a device of the nature described in the begining, which avoids the mentioned disadvantages and which improves especially the determination and adjustment of the optimum insertion point of auto leveller at a regulating device of the drafting system. The solution of this problem takes place by the distinguishing features of the patent claim no.l. By the measures in accordance with the innovation the optimum insertion point of auto leveller (optimum dead time) is determined by the draft itself. With the help of the CV-values measured on line of the card sliver there determines the control of the drawing frame the optimum point of insertion of the auto leveller that means, that the machine optimises 'itself. By the inclusion of different natured quality distinguishing dimensions, as CV-value; the point of insertion of the auto leveller is determined more precisely. Moreover a quicker determination of the point of insertion of the auto leveller is rendered possible. The patent claims 2-18 have advantageous further develop, ments of the innovation. The innovation is explained in detail in the followinq with the help of the examples of execution represented through/drawing. It shows : Fig.l A draft regulator with the device in accordance with the innovation in schematical lateral view, Figure la A development with a separate anticipating control. Figure 2 The main draft zone with the main draft point. Figure 3 Influence of the insertion point of auto leveller on the on line CV-value and Figure 4 Visualising of the automatic determination of the optimum insertion point of auto leveller. According to figure 1 there displays a draft 1, for example, Truetzschler draft HSR, a drafting device2,on which a drafting are device (system) inlet 3 and a drafting system outlet 4/pre supported and subsequently supported. The card sliver 5 exit from (not represented) cans coming in the sliver guide 6 and are transported along drawn by the withdrawing (take-up) rollers 7,8 at the measuring component 9. The drafting system 2 is designed as 4 -above 3 drafting system rolling mill, that means, it consists of three bottom rolls I, II, III (I - discharge-bottom roll, II - middle-bottom roll, III - entrance-bottom roll) and four top rolls 11, 12, 13, 14. In the drafting system rolling mill 2 there takes place the draft of the card sliver 5' from several card slivers 5. . The draft composes itself from pre-drafting and main drafting. The pairs of rolls 14/III and 13/II build the pre-draft area and the pairs of rolls 13/II and 11, 3 Contd P/4. 4 12/I build the main drafting area. The drafted card sliver 5 arrives in the drafting device outlet 4 a web guide 10 and are drawn with the help of the withdrawl (take-up) roller 15 and 16 by a sliver funnel 17, in which these are integrated to a card sliver 18, which is subsequently deposited in cans. With A the direction of work is designated. The take-up rolls 7, 8, the initial bottom roll III and the middle bottom roll II, which are coupled mechanically, for example, by toothed type belt, are driven by the variable speed motor 19, where a desired value is forecastable . (The pertaining top rolls 14 and 13 run along with). The discharge-bottom roll I and the take-up roll 15, 16 are driven by the main motor 20. The variable speed motor 19 and the main motor 20 each possesseses a regulator 21 and 22. The regulation (speed control) takes place in each case through a closed regulating circuit, where to the regulator 19 a tacho alternator 23 and to the main motor 20 a tacho alternator 24 is allocated. At the inlet of drafting system 3 a measure proportionate to the mass, for example, the cross section of the fed-in card sliver 5, is measured by an inlet measuring organ 9, that, for example, is known from the DE-A-44 04 326. At the outlet of drafting system 4 the cross section of the dischargedcard sliver 18 is won over by a discharge measuring organ allocated to the sliver funnel 17, which, for example, is known from the DE-A-195-37 983. A central computing unit 26 (control and regulating device), for example, micro computer with micro processor transmits an adjustment of the desired dimension for the variable speed motor 19 to the regulator 21. The measured quantity of both the measuring organs 9 and 25 are transmitted to the central computing unit 26 during the drafting process. From the measured-dimensions of the inlet measuring organ 9 and from the desired value for the cross section of the discharging card sliver 18 in the central computing unit 26 the desired value for the variable speed motor 19 is determined. The measured dimension of the outlet measuring organ 25 help the monitoring of the outcoming card Contd P/5. 5 sliver 18 (discharge sliver monitoring). With the help of this regulating system the variations in the cross section of the fed-in card sliver 5 can be compensated by appropriate regulations of the draft process and a comparability of the card sliver can be achieved. With 27 a display screen, with 28 an interface, with 29 a feeding device and with 30a pressure bar is indicated. The anticipatory control can be integrated, according to figure no. 1, in a central computing unit 26. A separate anticipatory controlling device 30 can be prevalent in accordance with figure no.la, which is attached between the computing unit 26 and the regulator 21 . The computing unit 26 changes the point of insertion or auto leveller R of the anticipatory control 30. error sensing device The test data of the/ (measuring component) (unit) 9, for example, variations in thickness of the card sliver 5 are led to a memory (accumulator) 31 in the computer 26 with variable delay. By the delay it is achieved, that the change of the draft of the card sliver in the main draft zone takes place then, according to figure no.2, when the card sliver range measured earlier by the measuring component 9 prevails with the thickness deviating from the desired value in the main draft point 32. When this sliver range reaches the main draft point 32, the belonging test data is recalled from the memory 31. The distance between the measuring place of the measuring component /9 and the place of 32 draft at the main draft point/is the point of insertion of the auto leveller R. The device in accordance with the innovation renders possible the direct determination of adjusting value for the point of starting of auto 1evel1er R. With the help of the drafted (stretched) card sliver 5'' a majority of test data of the card sliver thickness of the outgoing card sliver 51" are received through the sliver funnel 17 and the measuring organ 25, and, Contd P/6. 6 in fact, by various sliver lengths, from which three CV-values CV1m' CV10cm' CV3cm) are calculated as quantity indicating dimensions. With the help of the undrafted (unstretched) card sliver 5 test data in respect of the card sliver thickness of the incoming card sliver 5 for a definite length of sliver are received by the guiding of the sliver 6 and the measuring organ 9 in an appropriate manner, from which CV-values (CV. ) as quality indicating measure are calculated. The determination of the CV-values takes place for preferably four insertion points of auto leveller R. There appropriately, in each case, two insertion points of auto leveller R of this side and two points of insertion of auto leveller R on the other side of the optimum insertion point of auto leveller R are elected. From the r opt CV-values of the unstretched card sliver 5 and of the stretched card sliver 5'', in each case, a quality code number QK is determined on the basis of calculation. Furthermore, a function between the quality code numbers QK and the corresponding insertion point of auto leveller R is calculated in the computer 26 and is represented in the display screen 27 (pls. see fig. 3 & 4). There a polynom of the second grade is determined from the four values for the insertion point of the auto leveller R and the pertaining quality code numbers QK and subsequently the minimum of the curve is calculated. The minimum of the function corresponds with the optimal insertion point of auto leveller R (pls. see fig. 4). In this manner on the basis of the drafted card sliver 5'' several measuring values of three different CV-values and on the basis of the undrafted card sliver 5 several test data of a CV-value are received, in relation to the insertion point of auto leveller R CV-values corresponding with one another for a quality code number QK are integrated and with the help of several quality code numbers QK a function is determined by calculation, whose minimum corresponds with the optimal insertion point of auto leveller Ropt Contd P/7. 7 In operation in one adjusting and test-run in a first step a first value conceived, preferably known from experience for the insertion point of auto leveller for example, R-5 is adjusted. The input can take place through the input device 29 or from a memory (accumulator). In addition, one proceeds as follows (1) The on line measured sliverquality for each adjustment of an insertion point of auto leveller is determined, in each case, by a sliver length of 250 to 300 metre. (2) The measurements for optimisation of the insertion point of auto leveller are implemented at one piece without exchange of cans, if necessary, with machines-stand-still between the individual insertion point of auto leveller. (3) The determination of the on line measured sliver quality takes place through following quality values : * Outlet (discharge) sliverquality : CV3cm' CV10cm' CVlm (SLIVER-FOCUS) * Feed sliver quality is described by : CV. (inlet measuring funnel) From this different quality values a quality code number QK is determined : QK= CV3cm, + CV10cm + CVlm - CVin With this quality code number the sliverquality is described adequately : QK high => quality bad QK low => quality good Contd P/8. 8 Conditioned by the QK-equation the natural dispersion of the individual values are reduced and outlier not over-valued. The mean value formation leads to exact prediction and under the influence of the regulation both the long as well as short wave lengths are taken into consideration. Even the influence of the feed quality card sliver 5 is taken into consideration in the calculation. The QK-values, which may be calculated from the actual CV-values of the tests, are inserted in order to be able to develop the steps 4,5,6,7,8. The quality run above the point of starting of auto leveller R is always symmetrical to the curve minimum (figure 3), that means, in case of optimal starting point of auto leveller R of 0 the CV-value worsening at -4 is exactly so large as at +4. The functional correlation is described on the ground of the symmetry by a polynom of second grade. The range between -5 and +5 should have been taken into consideration advantageously, so that the differences in quality are large enough and simultaneously the level of the insertion point of regulation remains realistic. Gradation of 3 to 4 values for the insertion point of auto leveller R supply sufficient supporting points (four piece) : -5-4-3-2-1012345 With the help of numerical solving methods now from the four values a polynom of second grade (symmetrical run) is determined for the insertion point of auto 1 evel1er R and for the QK-values belonging thereto. Subsequently, the minimum of the curve is determined with the help of numerical method. Contd P/9. 9 This minimum value is the optimum insertion point of auto leveller R. In case of prevailing machine adjustment and given sliver material (pls. see fig. 4). With the help of visualising (display screen 27) it is possible to represent (fig. 4) the automatic determination of the insertion point of auto leveller for the operator in a subsequently executable manner. Several different natured CV-values of different sectional (cutting length) are compared with one another, and besides the discharge quality (card sliver 5'') also the feed quality is taken into consideration as an important quality-feature. Furthermore, the main drafting point from the minimum of a polynom of second grade, that means, a symmetrical run is computed. Several different CV-values are integrated according to an algorithm for a quality code number QK. From the insertion point of auto leveller R and the corresponding quality code number a function is approximated. The minimum is calculated from the resulting functional runs. The determination takes place in the pre-operation-test or adjusting run. The optimised insertion point of auto 1evel1er Ropt is taken over before beginning of the production operation by the control 26:30 and a consistency enquiry with, in case of necessity, fault recording is implemented. In one graphic the result is represented to the operator In a subsequently performable manner. Four quality code numbers QK are determined for stipulated inserting point of auto leveller R. These four quality code numbers are deposited in an accumulator (memory) and from them a functional run is approximated. Only then the minimum from the functional run is computed. For each quality code number some meter of card slivers are required. The quality indicating dimension (CV-value) is determined both between the delivery roll and deposit (discharge), but also at the inlet measuring hopper. Contd P/10. 10 measuring hopper. The test run is conducted within a can filling. Between the four insertion points of auto leveliler R (support points) the machine is stopped. The definite four insertion points of auto leveller R display different distances. The advantages of the automatic optimisation of the insertion point of the auto leveller consist of among other things : (a) Quicker optimisation of the insertion point of auto leveller. (b) Material sparing optimisation. (c) No requirement of the laboratory and of the Uster-Tester. (d) CV-values for the optimisation are no more spoiled by effects like depositing of can, influences of climate etc. Thereby better optimisation result. (e) Realisation of the "self optimising draft (stretch)". (f) Effective utilisation of the machine control (computer 26). (g) With the help of automatic optimisation the optimal insertion point of auto leveller can even be found, when the data of the working storage and the data of the mechanical adjustment do not conform with one another. (h) Transfer of knowledge for progress during the manual optimisation to the operator drops out. By the automatic determination of the insertion point of auto leveller (main draft point) it is possible to improve not only Contd P/ll. 11 the sliver uniformity, but also in the same extent the CV-values of the thread quality. This showed spinning machine final count in case of PES/BW mixture. The innovation was explained with an example of an auto leveller 1. It is applicable similarly in case of machines, which displaya controllable drafting device 2, for example, a card for cotton spinning, combing machine or similar things. -12-WE CLAIM 1. In a method of directly determining setting values for an application point of regulation in a draw unit for drafting sliver; the method including the steps of obtaining a plurality of measured values of a quality-characterizing magnitude of the drafted sliver; utilizing the measured values for formulating a function having a minimum constituting an optimal application point of regulation for controlling the draw unit; determining the optimal application point of regulation in a pre- operational run of the draw unit; the improvement comprising the steps of obtaining measured values of at least two quality-characterizing magnitudes based on a drafted sliver portion; combining values of the quality-characterizing magnitudes at the sliver, which correspond to one another with respect to the application point of regulation, to a quality-characterizing number QK, and forming a function based on several numbers QK; said function having a minimum corresponding to an optimal application point of regulation Ropt. 2. The method as claimed in claim 1, wherein said quality-characterizing magnitude is a CV value. 3. The method as claimed in claim 1, further comprising the step of obtaining several measured values of at least one quality-characterizing magnitude measured on an un-drafted sliver portion. -13- 4. The method as claimed in claim 1, further comprising the step of establishing the function between quality-characterizing magnitudes and application points of regulation from measured values taken on the drafted sliver portion and an un-drafted sliver portion. 5. The method as claimed in claim 1, further comprising the step of maintaining an optimized application point of regulation Ropt substantially unchanged. 6. The method as claimed in claim 1, further comprising the step of obtaining two different quality-characterizing magnitudes measured at a drafted sliver portion. 7. The method as claimed in claim 1, further comprising the step of obtaining a plurality of different quality-characterizing magnitudes measured at sliver portions of different length. 8. The method as claimed in claim 1, further comprising the step of utilizing at least three measured values for formulating the function of quality-characterizing numbers. 9. The method as claimed in claim 1, further comprising the step of utilizing four measured values for formulating the function of quality- characterizing numbers. - 14- 10. The method as claimed in claim 1, further comprising the steps of storing at least three quality-characterizing numbers in a memory, formulating the function and determining the minimum of the function by calculation. 11. The method as claimed in claim 1, further comprising the steps of determining Ropt during a test run, applying Ropt to a preliminary drafting control of the draw unit prior to normal operation and performing a plausibility check. 12. The method as claimed in claim 1, wherein said draw unit has output delivery rolls; further comprising the step of measuring the quality- characterizing magnitude of the drafted sliver downstream of the delivery rolls, as viewed in a direction of sliver advance. 13. The method as claimed in claim 1, further comprising the step of obtaining the measured values during a test run of the draw unit within a time period during which one coiler can is filled with sliver as outputted by the draw unit. Dated this 20th day of August, 2001 1. In a method of directly determining setting values for an application point of regulation in a draw unit for drafting sliver; the method including the steps of obtaining a plurality of measured values of a quality-characterizing magnitude of the drafted sliver; utilizing the measured values for formulating a function having a minimum constituting an optimal application point of regulation for controlling the draw unit; determining the optimal application point of regulation in a pre- operational run of the draw unit; the improvement comprising the steps of obtaining measured values of at least two quality-characterizing magnitudes based on a drafted sliver portion; combining values of the quality-characterizing magnitudes at the sliver, which correspond to one another with respect to the application point of regulation, to a quality-characterizing number QK, and forming a function based on several numbers QK; said function having a minimum corresponding to an optimal application point of regulation Ropt.

Full Text

Device at a draft regulator for fibrous material for direct determination of values for the insertion point of auto leveller.
The Innovation pertains to a device at a draft regulator for fibrous material for direct determination of setting (control) values for the insertion point of draft regulator, in case of which the control of the drafting frame adjustable in the draft by the card sliver displays at least one anticipatory control, in order to change the draft of the card sliver, where with the help of drafted (stretched) card sliver several test data of a quality indicating dimension, as CV-value, are receivable and are withdrawable towards determination of a function, whose minimum results an optimal insertion point of draft regulator for the control of the draft and the optimised insertion point of draft regulator is determinate in a propulsive testing or adjusting run of the drafting (drawing frame).
The insertion point of auto 1evel1er is an important setting
dimension at the draft, in order to produce card sliver with a
sliver high card/uniformity, that means, with a low CV-value.
In a known device and in a propulsive setting (adjusting) run the card sliver between middle rolls and feed rolls (delivery roll) of the drafting system (device) are drafted and are withdrawn by Calandar rolls, at which a measuring device for the CV-value of the drafted card sliver is connected. In the propulsive adjusting run a multiple of CV test data are determined, which represent a quality indicating measure, relating to the drafted card sliver. With the help of this several test data a functional run is determined, whose minimum corresponds with that value, which promises the best matching of the regulation at the actual card sliver. The several test data,
2
which are indicated, and with which the functional run is determined, are measured at one, in each case, other adjusting value of the regulation, so that for the definition of the to be evaluated functional run a self incrementally changing parameter, for example, the insertion point of auto leveller of the "electronic memory", is to be collated/ with each of its increment value to one of the/data. Disadvantageous is, that the quality of the card sliver (feed quality) running-in in the drafting system and unstretched cannot be taken into consideration. Besides that, it is disturbing, that only a certain, that means, a similar CV-value is requisitioned.
The innovation takes, therefore, the task as the basis to arrange a device of the nature described in the begining, which avoids the mentioned disadvantages and which improves especially the determination and adjustment of the optimum insertion point of auto leveller at a regulating device of the drafting system.
The solution of this problem takes place by the distinguishing features of the patent claim no.l.
By the measures in accordance with the innovation the optimum insertion point of auto leveller (optimum dead time) is determined by the draft itself. With the help of the CV-values measured on line of the card sliver there determines the control of the drawing frame the optimum point of insertion of the auto leveller that means, that the machine optimises 'itself. By the inclusion of different natured quality distinguishing dimensions, as CV-value; the point of insertion of the auto leveller is determined more precisely. Moreover a quicker determination of the point of insertion of the auto leveller is rendered possible.
The patent claims 2-18 have advantageous further develop, ments of the innovation.
The innovation is explained in detail in the followinq with the help of the examples of execution represented through/drawing.
It shows :
Fig.l A draft regulator with the device in accordance with the innovation in schematical lateral view,
Figure la A development with a separate anticipating control.
Figure 2 The main draft zone with the main draft point.
Figure 3 Influence of the insertion point of auto leveller on the on line CV-value and
Figure 4 Visualising of the automatic determination of the optimum insertion point of auto leveller.
According to figure 1 there displays a draft 1, for example, Truetzschler draft HSR, a drafting device2,on which a drafting
are
device (system) inlet 3 and a drafting system outlet 4/pre supported and subsequently supported. The card sliver 5 exit from (not represented) cans coming in the sliver guide 6 and are transported along drawn by the withdrawing (take-up) rollers 7,8 at the measuring component 9. The drafting system 2 is designed as 4 -above 3 drafting system rolling mill, that means, it consists of three bottom rolls I, II, III (I - discharge-bottom roll, II - middle-bottom roll, III - entrance-bottom roll) and four top rolls 11, 12, 13, 14. In the drafting system rolling mill 2 there takes place the draft of the card sliver 5' from several card slivers 5. . The draft composes itself from pre-drafting and main drafting. The pairs of rolls 14/III and 13/II build the pre-draft area and the pairs of rolls 13/II and 11,
3
Contd P/4.
4
12/I build the main drafting area. The drafted card sliver 5 arrives in the drafting device outlet 4 a web guide 10 and are drawn with the help of the withdrawl (take-up) roller 15 and 16 by a sliver funnel 17, in which these are integrated to a card sliver 18, which is subsequently deposited in cans. With A the direction of work is designated.
The take-up rolls 7, 8, the initial bottom roll III and the middle bottom roll II, which are coupled mechanically, for example, by toothed type belt, are driven by the variable speed motor 19, where a desired value is forecastable . (The pertaining top rolls 14 and 13 run along with). The discharge-bottom roll I and the take-up roll 15, 16 are driven by the main motor 20. The variable speed motor 19 and the main motor 20 each possesseses a regulator 21 and 22. The regulation (speed control) takes place in each case through a closed regulating circuit, where to the regulator 19 a tacho alternator 23 and to the main motor 20 a tacho alternator 24 is allocated. At the inlet of drafting system 3 a measure proportionate to the mass, for example, the cross section of the fed-in card sliver 5, is measured by an inlet measuring organ 9, that, for example, is known from the DE-A-44 04 326. At the outlet of drafting system 4 the cross section of the dischargedcard sliver 18 is won over by a discharge measuring organ allocated to the sliver funnel 17, which, for example, is known from the DE-A-195-37 983. A central computing unit 26 (control and regulating device), for example, micro computer with micro processor transmits an adjustment of the desired dimension for the variable speed motor 19 to the regulator 21. The measured quantity of both the measuring organs 9 and 25 are transmitted to the central computing unit 26 during the drafting process. From the measured-dimensions of the inlet measuring organ 9 and from the desired value for the cross section of the discharging card sliver 18 in the central computing unit 26 the desired value for the variable speed motor 19 is determined. The measured dimension of the outlet measuring organ 25 help the monitoring of the outcoming card
Contd P/5.
5
sliver 18 (discharge sliver monitoring). With the help of this regulating system the variations in the cross section of the fed-in card sliver 5 can be compensated by appropriate regulations of the draft process and a comparability of the card sliver can be achieved. With 27 a display screen, with 28 an interface, with 29 a feeding device and with 30a pressure bar is indicated.
The anticipatory control can be integrated, according to figure no. 1, in a central computing unit 26. A separate anticipatory controlling device 30 can be prevalent in accordance with figure no.la, which is attached between the computing unit 26 and the regulator 21 . The computing unit 26 changes the point of insertion or auto leveller R of the anticipatory control 30.
error sensing device The test data of the/ (measuring component) (unit) 9, for example,
variations in thickness of the card sliver 5 are led to a memory (accumulator) 31 in the computer 26 with variable delay. By the delay it is achieved, that the change of the draft of the card sliver in the main draft zone takes place then, according to figure no.2, when the card sliver range measured earlier by the measuring component 9 prevails with the thickness deviating from the desired value in the main draft point 32. When this sliver range reaches the main draft point 32, the belonging test data is recalled from the memory 31. The distance between the
measuring place of the measuring component /9 and the place of
32 draft at the main draft point/is the point of insertion of the
auto leveller R.
The device in accordance with the innovation renders possible the direct determination of adjusting value for the point of starting of auto 1evel1er R. With the help of the drafted (stretched) card sliver 5'' a majority of test data of the card sliver thickness of the outgoing card sliver 51" are received through the sliver funnel 17 and the measuring organ 25, and,
Contd P/6.
6
in fact, by various sliver lengths, from which three CV-values CV1m' CV10cm' CV3cm) are calculated as quantity indicating dimensions.
With the help of the undrafted (unstretched) card sliver 5 test data in respect of the card sliver thickness of the incoming card sliver 5 for a definite length of sliver are received by the guiding of the sliver 6 and the measuring organ 9 in an appropriate manner, from which CV-values (CV. ) as quality indicating measure are calculated. The determination of the CV-values takes place for preferably four insertion points of auto leveller R. There appropriately, in each case, two insertion points of auto leveller R of this side and two points of insertion of auto leveller R on the other side of the optimum
insertion point of auto leveller R are elected. From the
r opt
CV-values of the unstretched card sliver 5 and of the stretched card sliver 5'', in each case, a quality code number QK is determined on the basis of calculation. Furthermore, a function between the quality code numbers QK and the corresponding insertion point of auto leveller R is calculated in the computer 26 and is represented in the display screen 27 (pls. see fig. 3 & 4). There a polynom of the second grade is determined from the four values for the insertion point of the auto leveller R and the pertaining quality code numbers QK and subsequently the minimum of the curve is calculated. The minimum of the function corresponds with the optimal insertion point of auto leveller R (pls. see fig. 4). In this manner on the basis of the drafted card sliver 5'' several measuring values of three different CV-values and on the basis of the undrafted card sliver 5 several test data of a CV-value are received, in relation to the insertion point of auto leveller R CV-values corresponding with one another for a quality code number QK are integrated and with the help of several quality code numbers QK a function is determined by calculation, whose minimum corresponds with the optimal insertion point of auto leveller Ropt
Contd P/7.
7
In operation in one adjusting and test-run in a first step a first value conceived, preferably known from experience for the insertion point of auto leveller for example, R-5 is adjusted. The input can take place through the input device 29 or from a memory (accumulator). In addition, one proceeds as follows
(1) The on line measured sliverquality for each adjustment of
an insertion point of auto leveller is determined, in each
case, by a sliver length of 250 to 300 metre.
(2) The measurements for optimisation of the insertion point
of auto leveller are implemented at one piece without
exchange of cans, if necessary, with machines-stand-still
between the individual insertion point of auto leveller.
(3) The determination of the on line measured sliver quality
takes place through following quality values :

* Outlet (discharge) sliverquality : CV3cm' CV10cm' CVlm
(SLIVER-FOCUS)
* Feed sliver quality is described by : CV. (inlet
measuring funnel)
From this different quality values a quality code number QK is determined :
QK= CV3cm, + CV10cm + CVlm - CVin
With this quality code number the sliverquality is described adequately :
QK high => quality bad QK low => quality good
Contd P/8.
8
Conditioned by the QK-equation the natural dispersion of the individual values are reduced and outlier not over-valued. The mean value formation leads to exact prediction and under the influence of the regulation both the long as well as short wave lengths are taken into consideration. Even the influence of the feed quality card sliver 5 is taken into consideration in the calculation.
The QK-values, which may be calculated from the actual CV-values of the tests, are inserted in order to be able to develop the steps 4,5,6,7,8.
The quality run above the point of starting of auto leveller R is always symmetrical to the curve minimum (figure 3), that means, in case of optimal starting point of auto leveller R of 0 the CV-value worsening at -4 is exactly so large as at +4. The functional correlation is described on the ground of the symmetry by a polynom of second grade.
The range between -5 and +5 should have been taken into consideration advantageously, so that the differences in quality are large enough and simultaneously the level of the insertion point of regulation remains realistic.
Gradation of 3 to 4 values for the insertion point of auto leveller R supply sufficient supporting points (four piece) : -5-4-3-2-1012345
With the help of numerical solving methods now from the four values a polynom of second grade (symmetrical run) is determined for the insertion point of auto 1 evel1er R and for the QK-values belonging thereto.
Subsequently, the minimum of the curve is determined with the help of numerical method.
Contd P/9.
9
This minimum value is the optimum insertion point of auto leveller R. In case of prevailing machine adjustment and given sliver material (pls. see fig. 4).
With the help of visualising (display screen 27) it is possible to represent (fig. 4) the automatic determination of the insertion point of auto leveller for the operator in a subsequently executable manner.
Several different natured CV-values of different sectional (cutting length) are compared with one another, and besides the discharge quality (card sliver 5'') also the feed quality is taken into consideration as an important quality-feature. Furthermore, the main drafting point from the minimum of a polynom of second grade, that means, a symmetrical run is computed. Several different CV-values are integrated according to an algorithm for a quality code number QK. From the insertion point of auto leveller R and the corresponding quality code number a function is approximated. The minimum is calculated from the resulting functional runs. The determination takes place in the pre-operation-test or adjusting run. The optimised insertion point of auto 1evel1er Ropt is taken over before beginning of the production operation by the control 26:30 and a consistency enquiry with, in case of necessity, fault recording is implemented. In one graphic the result is represented to the operator In a subsequently performable manner. Four quality code numbers QK are determined for stipulated inserting point of auto leveller R. These four quality code numbers are deposited in an accumulator (memory) and from them a functional run is approximated. Only then the minimum from the functional run is computed. For each quality code number some meter of card slivers are required. The quality indicating dimension (CV-value) is determined both between the delivery roll and deposit (discharge), but also at the inlet measuring hopper.
Contd P/10.
10
measuring hopper. The test run is conducted within a can filling. Between the four insertion points of auto leveliler R (support points) the machine is stopped. The definite four insertion points of auto leveller R display different distances.
The advantages of the automatic optimisation of the insertion point of the auto leveller consist of among other things :
(a) Quicker optimisation of the insertion point of auto
leveller.
(b) Material sparing optimisation.
(c) No requirement of the laboratory and of the Uster-Tester.
(d) CV-values for the optimisation are no more spoiled by
effects like depositing of can, influences of climate etc.
Thereby better optimisation result.
(e) Realisation of the "self optimising draft (stretch)".
(f) Effective utilisation of the machine control (computer
26).
(g) With the help of automatic optimisation the optimal
insertion point of auto leveller can even be found, when
the data of the working storage and the data of the
mechanical adjustment do not conform with one another.
(h) Transfer of knowledge for progress during the manual optimisation to the operator drops out.
By the automatic determination of the insertion point of auto leveller (main draft point) it is possible to improve not only
Contd P/ll.
11
the sliver uniformity, but also in the same extent the CV-values of the thread quality. This showed spinning machine final count in case of PES/BW mixture.
The innovation was explained with an example of an auto leveller
1. It is applicable similarly in case of machines, which
displaya controllable drafting device 2, for example, a card for cotton spinning, combing machine or similar things.
-12-WE CLAIM
1. In a method of directly determining setting values for an application
point of regulation in a draw unit for drafting sliver; the method including
the steps of
obtaining a plurality of measured values of a quality-characterizing
magnitude of the drafted sliver;
utilizing the measured values for formulating a function having a
minimum constituting an optimal application point of regulation for
controlling the draw unit;
determining the optimal application point of regulation in a pre-
operational run of the draw unit;
the improvement comprising the steps of obtaining measured values
of at least two quality-characterizing magnitudes based on a drafted
sliver portion; combining values of the quality-characterizing
magnitudes at the sliver, which correspond to one another with respect
to the application point of regulation, to a quality-characterizing
number QK, and forming a function based on several numbers QK;
said function having a minimum corresponding to an optimal
application point of regulation Ropt.
2. The method as claimed in claim 1, wherein said quality-characterizing
magnitude is a CV value.
3. The method as claimed in claim 1, further comprising the step of
obtaining several measured values of at least one quality-characterizing
magnitude measured on an un-drafted sliver portion.
-13-
4. The method as claimed in claim 1, further comprising the step of
establishing the function between quality-characterizing magnitudes and
application points of regulation from measured values taken on the drafted
sliver portion and an un-drafted sliver portion.
5. The method as claimed in claim 1, further comprising the step of
maintaining an optimized application point of regulation Ropt substantially
unchanged.
6. The method as claimed in claim 1, further comprising the step of
obtaining two different quality-characterizing magnitudes measured at a
drafted sliver portion.
7. The method as claimed in claim 1, further comprising the step of
obtaining a plurality of different quality-characterizing magnitudes measured
at sliver portions of different length.
8. The method as claimed in claim 1, further comprising the step of
utilizing at least three measured values for formulating the function of
quality-characterizing numbers.
9. The method as claimed in claim 1, further comprising the step of
utilizing four measured values for formulating the function of quality-
characterizing numbers.
- 14-
10. The method as claimed in claim 1, further comprising the steps of
storing at least three quality-characterizing numbers in a memory,
formulating the function and determining the minimum of the function by
calculation.
11. The method as claimed in claim 1, further comprising the steps of
determining Ropt during a test run, applying Ropt to a preliminary drafting
control of the draw unit prior to normal operation and performing a
plausibility check.
12. The method as claimed in claim 1, wherein said draw unit has output
delivery rolls; further comprising the step of measuring the quality-
characterizing magnitude of the drafted sliver downstream of the delivery
rolls, as viewed in a direction of sliver advance.
13. The method as claimed in claim 1, further comprising the step of
obtaining the measured values during a test run of the draw unit within a
time period during which one coiler can is filled with sliver as outputted by
the draw unit.
Dated this 20th day of August, 2001

1. In a method of directly determining setting values for an application point of regulation in a draw unit for drafting sliver; the method including the steps of
obtaining a plurality of measured values of a quality-characterizing
magnitude of the drafted sliver;
utilizing the measured values for formulating a function having a
minimum constituting an optimal application point of regulation for
controlling the draw unit;
determining the optimal application point of regulation in a pre-
operational run of the draw unit;
the improvement comprising the steps of obtaining measured values
of at least two quality-characterizing magnitudes based on a drafted
sliver portion; combining values of the quality-characterizing
magnitudes at the sliver, which correspond to one another with respect
to the application point of regulation, to a quality-characterizing
number QK, and forming a function based on several numbers QK;
said function having a minimum corresponding to an optimal
application point of regulation Ropt.

Documents:

« Previous Patent

Next Patent »

Patent Number

209235

Indian Patent Application Number

00456/CAL/2001

PG Journal Number

34/2007

Publication Date

24-Aug-2007

Grant Date

23-Aug-2007

Date of Filing

20-Aug-2001

Name of Patentee

TRUTZSCHLER GMBH & CO. KG,

Applicant Address

DUVENSTRASSE 82-92, D-41199, MONCHENGLADBACH,

Inventors:

#	Inventor's Name	Inventor's Address
1	HERR, BREUER JOACHIM	IM MITTELFELD 22, D-52074 AACHEN,
2	HERR HARTUNG REINHARD	GRASFEED 9, D-41065, MONCHENGLADBACH, GERMANY

PCT International Classification Number

D01H 5/32

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	10041894.5	2000-08-25	Germany