WO2006039912A1

WO2006039912A1 - Method for operating a weaving and shedding machine

Info

Publication number: WO2006039912A1
Application number: PCT/DE2005/001823
Authority: WO
Inventors: Valentin Krumm; Michael Lehmann; Wolfgang Metzler
Original assignee: Lindauer Dornier Gesellschaft Mbh
Priority date: 2004-10-09
Filing date: 2005-10-07
Publication date: 2006-04-20
Also published as: JP2008516096A; EP1799899A1; DE102005046271A1; DE102005046271B4

Abstract

The invention relates to a weaving machine and a shedding machine each with at least one independent speed-adjustable electric motor drive, whereby time points or rotational angles for a speed change are fixed on the basis of certain criteria. According to the invention, computer means are provided preferably integrated in the electronic controller for the weaving and shedding machine which determine and set the control such as to give a synchronous or asynchronous speed change.

Description

Method for operating a weaving and a shedding machine

The invention relates to a method for operating a weaving and a shedding machine, the weaving and shedding machine each having at least one own variable-speed electric motor drive, wherein the loom and the shedding machine is operated at a predeterminable speed and wherein the drive in question with an electronic control signal transmitting connected.

The respective electric motor is variable in speed via suitable means. The suitable means may preferably be at least one inverter or at least one inverter. The inverter (s) for the weaving machine drive and the inverter (s) for the shingling machine drive can in this case be connected to one and the same DC link; within the meaning of the invention is still spoken by their own drives for the weaving and shedding machine, because the

Energy input for operating the weaving and shedding machine is not mechanically connected via geared and / or coupling means with the energy input system (drive) of the other machine.

DE 100 53 079 C1 and DE 102 36 095 B3 disclose methods for starting, operating and stopping web and shed forming machines, each with its own drive. In DE 100 61 717 A1 and DE 200 21 049 U1, at least one additional flywheel is proposed for the shedding machine. The additional flywheel reduces the speed fluctuations resulting from a variable moment of inertia of the shedding machine on the motor shaft. This changeable

Mass moment of inertia is in turn caused by variable gear ratios through which the masses or moments of inertia of sub-components, such as the shafts of the dobby, act on the motor shaft. The reduction of the speed variations leads to a reduction of loads in the gears, whereby higher operating speeds and / or a reduction in susceptibility to vibration is achieved. However, the at least one additional flywheel reduces the dynamics of the shedding machine speed change, on the one hand that restrictions due to the performance of the drive unit (usually expressed as a possible peak torque or potential peak current) are given and the other in that a correspondingly frequent occurring speed change leads to thermal problems of the drive unit, which may be the case even if the performance of the drive unit can perform a one-time speed change with sufficient dynamics. More powerful drive units are an unsatisfactory solution because they are expensive and sometimes cause a virtually insoluble installation space problem. Furthermore, the problem of large current peaks in the supply network is not solved, which accelerates the

Shedding machine occur. This energy can be converted into heat in a braking resistor, and the radiation area required for this purpose requires a corresponding size of the resistor and the housing possibly surrounding it, which in turn causes problems in terms of costs An alternative to the braking resistor is to feed back into the supply network, which is also a cost problem and partly space-related problem with respect to the control cabinet Another alternative is seen in DC, or countercurrent or short-circuit braking, ie in braking process, This converts the energy of the shedding machine predominantly into heating of the drive motor or of the drive motors, which requires a correspondingly large-sized motor, which in turn represents a cost and / or installation space problem.

It is an object of the invention to solve the aforementioned problems or at least minimize.

The object is achieved by the features of claim 1.

After that, at least one of the speeds required for the respective application is available

Π ₂ W _{M of} the weaving machine so in relation to the speed Π _2FB M of the _{shedding machine} that either Π _2F BM divided by Π ₂ WM or Π ₂ WM divided by Π ₂ FBM gives a natural number N greater than 1. The speeds Π _2W M _> n _2FBM are referred to as second speeds.

Let ΠI _WM , FB- _I FBM be the first speeds for which Π ^ M = Π _I FBM. A speed change from the first to the second speed of the weaving and shedding machine is asynchronous. That is, the difference Π _2FB M - Π _1FB M in the speed of the _{shedding machine} differs from the difference n _2WM - Π _1W M of loom in magnitude and / or sign.

The degree of freedom thus obtained is preferably used in that the shedding machine has to perform a much lower speed change compared to the loom, ie the amount of n _2FBM - Π _1FB M is smaller than that of n ₂ w _M - Π-IWM; most preferably, n is _2FBM _{-n 1FBM} = 0. With this reduction of or the speed change of the shedding machine two effects are achieved.

Effect 1:

The drive of the shedding machine can be designed smaller in terms of peak torque and peak power and / or is thermally relieved. That in the case of two identical shedding machine drives the asynchronous speed change between weaving and shedding machine according to the inventive method thermally less stressful than the one speed change, which takes place synchronously with the loom. If one makes use of the advantage of the method according to the invention to make the shedding machine drive smaller in terms of peak torque and peak power, this in turn generally increases the thermal load during the speed change. A technical compromise in which the shedding machine drive is reduced in terms of peak torque and peak power in a mass at which the thermal load of at least not less than that of an unimpeded shedding machine drive synchronous speed change of weaving and shedding machine, but preferably falls below, is recommended ,

Effect 2:

The speed change according to the inventive method is much more dynamic than the synchronous speed change - despite possibly one or more additional flywheel mass (s), which are effective on the shedding machine. So even in the dynamic ranges of a central common direct drive for weaving and shedding machine can be pushed forward.

A working cycle of the weaving machine ranges from a reed stop to the next reed stop and a working cycle of the shedding machine ranges from a point in which the subject is possible to the next point in which the business is possible.

The invention will be explained in more detail in the following embodiments.

In the drawings show:

1 shows the course of the asynchronous speed change in independently driven web and shed forming machine,

Figure 2 shows the type of shed change in the illustrated in Figure 1

Speed change of weaving and shedding machine, FIG. 3 shows a comparatively faster comparison with FIG

Speed change of the weaving machine,

FIG. 4 shows the preferred type of shed change in the case of that shown in FIG

Speed change of the weaving machine,

Figure 5 shows a further course of the speed change of the Web and

Shedding machine,

FIG. 6 shows a preferred type of shed change in the case of that shown in FIG

Course of the speed change of weaving and shedding machine and

Figure 7 shows the course of the speed change of weaving and shedding machine with more than two weft entries per shed.

FIG. 1 shows a diagram on whose ordinate the rotational speed n of a weaving and shedding machine is indicated and on whose abscissa the time t is indicated, to which a speed change of weaving and / or shedding machine takes place. First, a range reaching up to time t11 is shown, in which the rotational speeds n11_wm of the loom and n11_fbm of the shedding machine are the same. In the range from t11 to t12 the shedding machine has the speed n12_fbm, which is equal to the speed n11_fbm, ie the speed of the shedding machine does not change between t11 and t12. It is different with the weaving machine. Their speed changes from n11_wm to n12_wm in the range from t11 to t12. Where: n11_wm: n12_wm = N; N natural and> 1. In the illustrated ramp-shaped speed change in the range of t11 to t12, this means that between the traversed from time t11 to time t12 angle ranges .DELTA.αFBM the shedding machine and .DELTA.CC _W M the weaving machine, the relationship

ΔCIFBM ^" ■ ΛαwM = (Π-IFBM + Π ₂ FBM) • (n-twM + Π ₂ WM) If N = 2, ie n12_wm is half the size of n11_wm, it means that from time t11 to Time t12 covered angle ranges ACXFBM and Δαwwich behave as follows:

Δα FBM: ΔαwM = 4: 3.

That is, when the drive shaft of the shedding machine has performed 4 revolutions of the work and the drive shaft of the weaving machine has performed 3 revolutions of the work, the positions of the drive shafts of both machines again behave as at time t11 the speed change was initiated. Assuming that at the time t11 has the operational synchronicity between the drive shaft of the weaving and shedding machine, so it is restored after the aforementioned revolutions of shearing and weaving machine. In a preferred manner, from the time t11 no shed change is performed more, ie at t11 possibly still running shed change is brought to an end; Thereafter, the shed is kept open and the next shed change is started at a time that it is completed at the earliest at time t12. In the range from t12 to t13, the change of trays takes place only minimally every N work revolutions of the drive shaft of the shedding machine, ie at N = 2, at least every second working revolution of the drive shaft.

In the range from t13 to t14, the drive of the weaving machine accelerates its drive shaft again from n12_wm to n11_wm; the speed of the shedding machine remains unchanged with n12_fbm = n11_fbm. Where: n11_wm: n12_wm = N; N of course and> 1.

In the illustrated ramp-shaped speed change in the range from t13 to t14, this means that between the angular ranges ΔCXFBM of the shed forming machine and ΔOCWM of the weaving machine from time t13 to time t14 the relation ΔCXFBM: ΔOCWM = (Π _{1 F} BM ⁺ Π ₂ FBM): (ΠIWM ⁺ Π ₂ WM) applies. If N = 2, ie n12_wm half the size of n11_wm, this means that the angular ranges ΔOIFBM and ΔCCWM traveled from time t13 to time t14 behave as follows: ΔOCFBM: ΔOCWM = 4: 3 Shedding machine 4 has performed work revolutions and the drive shaft of the weaving machine has performed 3 working revolutions, the positions of the drive shafts of both machines behave again as at time t13, when the speed change was initiated. Assuming that at time t13, the operational synchronicity between the drive shaft of the weaving and shedding machine has passed, so it is restored after the aforementioned revolutions of shearing and weaving machine. In a preferred manner, from the time t13 no shed change is performed more, ie a possibly still running at t13 shed change is brought to an end; Thereafter, the shed is kept open and the next shed change started only so that it is not completed until the time t14. From the time t14, the drive shaft of the loom again has the speed n11_wm and the drive shaft of the shedding machine has the speed n11_fbm, where n11_wm is equal to n11_fbm. FIG. 2 shows the preferred type of shed change described under FIG. Here 2.1 shows the weaving course corresponding to the speed n11_fbm of the drive shaft of the shedding machine. The period of time from one shed 2.5 to the next is designated Δt21. In the course of the rotation speed change according to the invention, no shed change is carried out from the time t11, ie a shed change which may still be taking place at t11 is brought to an end; Thereafter, the shed is kept open and the next shed change started only at a time that it is completed at the earliest at time t12. In this case, the time span from one closure to the next is designated Δt22.

If the speed change of the weaving machine is ramped from n11_wm to n12_wm, as shown in FIG. 1, then the relationship between the angular ranges ΔCXF _B M of the shed forming machine and Δα _W M of the weaving machine between time t11 and time t12 applies Δα _FBM '• Δα _WM = (n _1FB M + Π 2FBM) ^" ■ (Π-IWM ⁺ Γ ^ WM) -

In a representation as a fraction with the smallest possible natural numbers in numerator and denominator, the natural number ZN 11 forming the numerator indicates the ratio between Δt22 and Δt21; the following applies: Δt22 = ZN11 ^• Δt21. If, for example, N = 2, as already described for FIG. 1, ΔOCFBM: ΔCXWM = 4: 3. In this case, ZN11 = 4. That is to say, in this case, the time interval Δt22 is four times as long as Δt21.

In the range of t12 to t13, the shed change takes place at least only every N work revolutions of the drive shaft of the shed forming machine. In the case: Δt23 = N ^• Δt21, where Δt23 is the time span from one technical qualification to the next technical qualification, in the range from t12 to t13 or when the loom has the rotational speed n12_wm. At N = 2, the time Δt23 is twice as long as Δt21.

In the course of the speed change according to the invention, from the time t13 no shed change is performed more, i. a shed change that may still be in progress at t13 will be completed; Thereafter, the shed is kept open and the next shed change is only started at a time that it is completed at the earliest at time t14. In this case, the time span from one closure to the next is designated Δt24.

If the speed change of the loom is ramped from n12_wm to n11_wm, as shown in FIG. 1, then, as stated above, between the angular ranges ΔCC _F BM covered by time t13 to time t14, the Shed forming machine and ΔOCWM of the loom the relationship ΔOCFBM: ΔαwM = 0 "IIFBM ⁺

In a representation as a fraction with the smallest possible natural numbers in numerator and denominator, the natural number ZN 12 forming the numerator indicates the ratio between Δt24 and Δt21; the following applies: Δt24 = ZN12 ^■ Δt21. If, for example, N = 2, then, as already described with reference to FIG. 1, ΔOC _FB M: ΔOCWM = 4: 3. In this case, ZN21 = 4. That is to say, in this case the time interval Δt24 is four times as long as Δt21.

Note to Figures 1 and 2: The speed change of the weaving machine can each begin with the Webblattanschlag and / or end; but this does not have to be the case.

Figure 3 shows a speed change of the weaving machine, which is faster than shown in Figure 1. That is, the relationship ΔOC _F BM: Δα _W wι> (Π-IFBM + Π ₂ FBM) applies: (ΓMWM ⁺ n _2WM ). Here, the ratio ΔCC _FB M is preferred: ΔCC _W M selected so that, for a representation as a fraction with this smallest possible integers in the numerator and denominator is the case the denominator forming natural number NN31 is less than that of natural number NN1 that in Preparation of the ratio ΔOCFBM: ΔαwM ⁼ (ΠIFBM ⁺ Π ₂ FBM): (n-iwM ⁺ Π ₂ WM) on which the smallest possible natural numbers form the denominator.

At N = 2, with speed change according to FIG. 1, yes ΔOC _F BM: ΔOC _W M = 4: 3, so NN1 = 3. In FIG. 3, the speed change of the weaving machine is carried out such that NN3 <3, eg such that NN31 = 2, where the counter is a 3. This means that the average speed of the loom in the range of speed change from 131 to t32 in relation to the speed of the shedding machine must be smaller than shown in Figure 1. If the rotational speeds n11_fbm (see FIG. 1), n12_fbm (see FIG. 1), n31_fbm and n32_fbm of the shedding machine are all assumed to be the same, the average rotational speed in the range t31 to t32 corresponds to the average rotational speed in the range t11 to t12 8: 9. The speed of the weaving machine is therefore shown in the area between the times t31 and t32 below a dashed speed curve (3.1) shown in dashed lines, which corresponds to the relationship ΔOC _F BM: ΔOC _W M = (Π _1F BM + Π ₂ FBM). : (Γ> IWM ⁺ Π ₂ WM) from Figure 1 corresponds. If NN31 = 2 and the counter is a 3, that is, if the drive shaft of the shedding machine 3 has performed work revolutions and the drive shaft of the weaving machine has performed 2 working revolutions, the positions of the drive shafts of both machines behave again as at time t31, as the speed change was initiated. Assuming that at the time t31 the operational synchronicity between the drives of the weaving and shedding machine has passed, so it is restored after the aforementioned working revolutions of the drive shaft of shedding and weaving machine. In a preferred manner, no shed change is carried out from t31 onwards, ie a shed change which may still be carried out at t31 is brought to an end; Thereafter, the shed is kept open and the next shed change is started only at a time that this is at the earliest completed at time t32.

In the range from t32 to t33, the shed change takes place at least only every N work revolutions of the drive shaft of the shedding machine, ie at N = 2, at least every second work revolution.

In the range from t33 to t34, the drive of the weaving machine accelerates its drive shaft again from n32_wm to n31_wm; the speed of the shedding machine remains unchanged with n32_fbm = n31_fbm. The speed change takes place in such a way that ΔCC _F BM: Δα _WM > (Π _1FB M + Π ₂ FBM): (n-twM + Π ₂ WM) applies. The ratio ΔOC _FB M: ΔOC _W M SO is preferably selected here, as in the speed change in the range t31 to t32, that the natural number NN32 forming the denominator is smaller in a representation as a fraction with the smallest possible natural numbers in numerator and denominator as the natural number NN1 which, when representing the ratio Δα _FBM : Δα _WM = (ΠI _F BM + Π _2FB M): (n-iwwi + Π ₂ WM) on which the figure is based, denote the smallest possible natural numbers Denominator forms.

At N = 2, with speed change according to FIG. 1, yes ΔOC _F BM: ΔOCWM = 4: 3, so NN1 = 3. In FIG. 3, the speed change of the weaving machine is carried out so that NN32 <3, eg NN32 = 2, with a 3 in the counter. This means that the average speed of the weaving machine in the range of the speed change from t33 to t34 in relation to

Speed of the shedding machine must be smaller than shown in Figure 1. If the rotational speeds n11_fbm (see FIG. 1), n12_fbm (see FIG. 1), n31_fbm and n32_fbm of the shedding machine are all assumed to be the same, then the average rotational speed in the range t33 to t34 corresponds to the average rotational speed in the range t13 to t14 8: 9. The speed of the weaving machine is therefore shown in the area between the times t33 and t34 below a dashed speed curve (3.2) shown in dashed lines, which of the relation Δα _FBM : Δα _WM = (ΠI _F BM + n _2FBM ): (Π _1W M + Π ₂ WM) from Figure 1 corresponds. If NN32 = 2 and the counter is a 3, that means when the drive shaft of the shedding machine has performed 3 working revolutions and the drive shaft of the weaving machine has performed 2 revolutions of the work, behave the positions of Drive shafts of both machines again as at time t33, when the speed change was initiated. Assuming that at the time t33 the operational synchronicity between the drives of the weaving and shedding machine has passed, so it is restored after the aforementioned revolutions of the drive shaft of shedding and loom. In a preferred manner, no shed change is carried out from t33 onwards, ie a shed change which may still be carried out at t33 is brought to an end; Thereafter, the shed is kept open and the next shed change is only started at a time that it is not completed until time t34 at the earliest. Of course, a mixture of the solutions of Figure 1 and 3 is possible, ie either the speed change of the loom from high to low speed or the speed change of the loom from low to high speed is performed according to Figure 1, the other speed change according to Figure 3.

FIG. 4 shows the preferred type of shed change described under FIG. Here, 4.1 shows the shed course in accordance with the speed n31_fbm of the shedding machine. The period of time from one technical degree 4.5 to the next following technical qualification is denoted Δt41. In the course of the rotation speed change according to the invention, no shed change is carried out from t31 onwards, ie a shed change which may still still take place at t31 is brought to an end; Thereafter, the shed is kept open and the next shed change is started only at a time that this is at the earliest completed at time t32. In this case, the period of time from one technical degree to the next following technical qualification is designated Δt42. It applies to the speed change according to Figure 3 Δα _FB M: ΔOCWM> (ΓIIFBM + Π ₂ FBM): (ΠWM ⁺ Π ₂ WM) - In a representation as a fraction with the smallest possible natural numbers in numerator and denominator which gives the counter forming natural number ZN31 the ratio between Δt42 and Δt41; the following applies: Δt42 = ZN31 ^• Δt41. For example, if Δα _FBM : Δα _WM = 3: 2 holds as described with reference to FIG. 3, then ZN31 = 3 in this case. That is, in this case, the period Δt42 is three times as long as Δt41. In the range of t32 to t33, the shed change takes place at least only every N work revolutions of the drive shaft of the shed forming machine. In this case: Δt43 = N ^■ Δt41, where Δt43 is the time span from one technical qualification to the next technical qualification, in the range from t42 to t43 or when the loom has the rotational speed n32_wm. , At N = 2, the time Δt43 is twice as long as Δt41. In the course of the rotation speed change according to the invention, no shed change is carried out from t33, ie, a shed change which may still be performed at t33 is brought to an end; After that, the shed is kept open and the next shed change is only to a date that this is at the earliest completed at the time t41. In this case, the time span from one technical degree to the next following technical qualification is designated Δt44. It applies to the speed change according to Figure 3: ΔCXF _B M: ΔCC _W M> ( ^Π IFBM + Π ₂ FBM): (niwwι ⁺ Π ₂ WM) - In a representation as a fraction with the smallest possible natural numbers in numerator and denominator there the natural number ZN32 forming the counter indicates the ratio between Δt44 and Δt41; the following applies: Δt44 = ZN32 ^• Δt41. If, for example, ΔOCFBM: ΔOCWM = 3: 2 applies as described with reference to FIG. 3, then ZN32 = 3 in this case. That is to say, in this case the time interval Δt44 is three times as long as Δt41.

Reference to FIGS. 3 and 4:

The speed change of the weaving machine can each begin with the Webblattanschlag and / or end; but this does not have to be the case.

The diagram acc. FIG. 5 shows a speed change in which the speed of the shedding machine also changes. In the range reaching up to time t51, the speeds n51_wm of the loom and n51_fbm of the shedding machine are the same. In the range from t51 to t52, the speed of the shedding machine changes from n51_fbm to n52_fbm and the speed of the weaving machine from n51_wm to n52_wm. The following applies: n52_fbm: n52_wm = N; N course and> 1. If both the speed change of the shedding machine and the speed change of the weaving machine ramps, so applies for the between the time t51 to time t52 angle ranges Δα _FBM the shedding machine and ΔOCWM the weaving machine, the relationship ΔOC _F BM: Δα _WM = (Π ^ BM + Π ₂ FBM): (ΠIWM + Π ₂ WM) = (N + Nk): (N + k), where k = n52_fbm: n51_fbm. If N = 2, ie n52_wm is half as large as n52_fbm, this yields: ΔOCFBM: ΔαwM = (2 + 2 k): (2 + k).

The procedure to increase the speed of the shedding machine is especially interesting when the lower speed of the loom (compare n52_wm) is greater than half the higher speed of the loom (compare n51_wm). Example: n51_wm = 900min ^"1 , n52_wm = 500min ^{" 1} . With a synchronous speed change of weaving and shedding machine (so n52_fbm = n52_wm), the kinetic energy of the shedding machine would change by ΔW _kin = (9 ² - 5 ² ) units = 56 units. If the shedding machine is instead accelerated to n52_fbm = 1000min ^"1 , the kinetic energy of the shedding machine changes only by (10 ² - 9 ² ) units = 19 units solution according to the invention at the same times for accelerating and braking the shedding machine only about one-third of the acceleration and braking power required as in a synchronous speed change.

That You can either operate the drive of the shedding machine low-consumption and thermally less loaded than the synchronous speed change or the

Use the efficiency of the drive for a significantly faster speed change or compromise on the degree of reduction in consumption and thermal load on the one hand and increasing the speed of the speed change on the other hand realize. When thermal loading of the drive of the shedding machine or the drive of the weaving machine is used, the thermal loading of the at least one control cabinet, in which the means for controlled or regulated operation of the drives (motors), usually frequency converters are installed, must be taken into account , This also applies to the possibly existing at least one brake resistance and possibly existing (s) housing (s). For the relation Δα _FBM : Aa _WM = (n _1FB M ⁺ Π ₂ FBM): (Π «M + Π ₂ WM) = (N + Nk): (N + k) results in a break with the smallest possible natural Numerals in numerator and denominator while the denominator forming natural number NN51 the number of full revolutions that drives the drive shaft of the loom, while the drive shaft of the shedding machine has also covered a different number of full revolutions, ie after how many revolutions of the drive shaft of the loom Synchronism of the drive of weaving and shedding machine, as it existed at the time t51 of the beginning of the speed change, is restored (at time t52). - Is that so resulting time interval AT = t52 151, for example, from the perspective of Webmaschinenbetreibers too long, the web and / or shedding machine departing from the ramp speed curve for the drive, the relationship ΔOC _FB M provided that: ΔOC _W M in fractional representation with the smallest possible natural numbers in numerator and denominator as denominator a natural number NN52, which is correspondingly smaller than NN51 (see Figure 3). Assuming that at the time t51 has the operational synchronicity between the drive of weaving and shedding machine, so it is restored after the aforementioned revolutions of the drive shaft of shedding and weaving machine (NN51 or NN52). In a preferred manner, no shed change will take place from t51, ie a shed change which may still be taking place at t51 will be brought to an end; Thereafter, the shed is kept open and the next shed change is started only at a time that it is completed at the earliest at time t52. In the range from t52 to t53, the shed change takes place at least only every N work revolutions of the drive shaft of the shedding machine, ie, at N = 2, at least every second work revolution.

In the range from t53 to t54 the drive of the loom accelerates again from n52_wm to n51_wm; The speed of the drive of the shedding machine changes from n52_fbm to n51_fbm.

If both the speed change of the shedding machine and the speed change of the weaving machine are ramped, then the relationship ΔOC _F BM: Δα _W M = (Π1FBM + Π ₂ FBM): (ΠIWM + Π ₂ WM) = (N + Nk): (N + k), where k = n52_fbm: n51_fbm. If N = 2, ie n52_wm is half as large as n52_fbm, this yields: Δα _FBM : Δα _WM = (2 + 2 k): (2 + k). In a preferred manner, no shed change will take place from t53, ie a shed change which may still be carried out at t53 will be completed; Thereafter, the shed is kept open and the next shed change is started only at a time that this is at the earliest completed at time t54.

From t54 the weaving machine again has the speed n51_wm and the shedding machine the speed n51_fbm. For the relation ΔOC _FB M: ΔOC _W M = (N + Nk): (N + k), when represented as a fraction with the smallest possible natural numbers in numerator and denominator, the natural number NN51 forming the denominator gives the number of full working revolutions the drive shaft of the weaving machine, while the drive shaft of the shedding machine has also carried out a different number of full working revolutions, ie after how many revolutions of the drive shaft of the loom, the synchronicity of the drives of weaving and shedding machine, as it existed at the time t53 of the beginning of the speed change , restored (at time t54). If the time interval ΔT = t54-153 resulting from this is too long, for example, from the operator's point of view, then the ramp-speed curve is deviated from the ramp-speed curve if the relationship ΔCIFBM: ΔOCWM is displayed as a break with the latter having the smallest possible natural numbers in numerator and denominator as a denominator, a natural number NN53 correspondingly smaller than NN51 (see Figure 3); NN53 is preferably = NN52. Assuming that at the time t53, the operational synchronicity between the drives of weaving and shedding machine has passed, the synchronicity is after the above working revolutions of the drive shaft of shedding and weaving machine (NN51 or NN53) restored. In a preferred manner, no shed change is carried out from t53, ie a shed change that may still be required at t53 is brought to an end; Thereafter, the shed is kept open and the next shed change is only started at a time that it is completed at the earliest at time t53.

A further advantage of the method according to FIG. 5 is a relief of the supply network and, if present, a braking resistor. Because while the weaving machine brakes to the lower speed, the drive accelerates the shedding machine and vice versa, while the drive of the weaving machine speeds up the loom, the drive of the shedding machine brakes the shedding machine. In other words, a direct energy exchange can take place between the two drives if the conditions have been created for this purpose by suitable means, for example a converter intermediate circuit.

In general, the operation according to the invention of the shedding machine with N-times the speed of the weaving machine (N natural and greater 1), wherein according to the invention the shed change while doing at least only every N work revolutions of the drive shaft of the shedding machine, two more advantages:

Advantage 1:

It increases in relation to a mode of operation in which the speed of the shedding machine is only as great as the speed of the loom, the time of the open compartment or the time in which the shot can be entered. This is because the shed change at higher speed of the shedding machine is done correspondingly faster.

Example: It is known from a weft thread that this weft weaving at the same speed of weaving and shedding machine with max. 500min ^"can enter ^first is instead chosen twice as high as the speed of the weaving machine, the speed of the shedding machine according to the inventive method, it is possible, for example, the weft yarn at a speed of the loom of ^525min" write ^one, while the speed of the shedding machine 1050min ^"1. of course, the maximum permissible speed of the shedding machine must be observed. Especially with longer sections where said Weft or comparable weft threads are entered, makes this increase in speed in the achievable goods throughput clearly noticeable.

Advantage 2:

In a number of applications, the weft should not touch the commodity chain; this is e.g. in the processing of certain synthetic yarns the case, wherein the friction of the weft yarn on warp threads this particular heated the warp threads and melt phenomena occur on the warp threads. Thus, the size of the weft insertion window, i. the time to completion, considerably limited and thus usually the possible speeds.

If, in accordance with the method according to the invention, the speed of the shedding machine is selected to be at least twice as high as the speed of the weaving machine, the shed change takes place correspondingly faster, as already shown in Advantage 1. This means that the weft insertion window becomes larger in time; It can be woven at a higher speed, because the weft insertion window is still in time as large as speed-synchronous operation of the drives of weaving and shedding machine at there correspondingly lower speed. In weaving machines with mechanical weft insertion this advantage is of particular relevance. These mechanical weft insertion means usually include gripper bands or gripper bars and eccentric and roller levers through which the movement of the gripper bands or gripper bars, but also, for example, shooters done. Since the weft insertion in the shed must be done very quickly while avoiding touching the chain of goods, the flow curves of the eccentric are very steep, ie the force or moment load is very high even at relatively low speeds. By the described temporal enlargement of the weft insertion window by application of the method according to the invention either the discharge curves of the eccentric can now be chosen correspondingly flatter; For the gripper bars or gripper bands, a cheaper material can be used. Under certain circumstances, it is possible to resort to standard gearbox solutions of other weaving machines, thus saving considerably on costs. Furthermore, the flow curves of the eccentric can be flattened only to a certain extent. The corresponding relief of the gear means higher speeds can be driven. It is conceivable to realize a compromise between the two procedures, namely gear modification on the one hand and higher speed on the other hand. The consideration of the energy change in the process design of Figure 5 shows that it depends on the value of the higher and lower speed, whether the method of Figure 5 is performed or whether a synchronous speed change of weaving and shedding machine is preferable. In the description of FIG. 5, the higher rotational speed n51_wm = 900min ^"1 and the lower rotational speed n52_wm = 500min ^{" 1 were} calculated. Instead, now for the weaving machine is a higher speed of 700min ^"1 and a lower speed of 500min ^{" 1} basis. In the method according to Figure 5, the shed-forming machine then runs at 1000 min ^-1 or greater natural number-multiples of the speed of the loom; 1000 min ^{-1 are} selected. The change in the kinetic energy in the asynchronous speed change of Web and shedding machine drives is then ΔW _kin = (10 ² - 7 ² ) units = 51 units. In contrast, changes the kinetic energy of the shedding machine synchronous speed change of the drives of weaving and shedding machine, ie if the shedding machine such as the loom between 700min ^"1 and 500min ^{" 1} changes, only by (7 ² - 5 ² ) units = 24 units , That is, in this case with the synchronous speed change either the drive of the shedding machine low-consumption and thermally less burdened than use in the inventive speed change or the performance of the drive for a much faster speed change or a compromise on the degree of reduction in consumption and thermal stress on the one hand and to increase the speed of the speed change on the other hand realize.

In a preferred embodiment of the solution according to the invention, both the asynchronous speed change of the drives of weaving and shedding machine as well as the synchronous speed change can be provided. In a further preferred embodiment suitable computer means are provided which are preferably integrated in the control of the weaving and / or shed forming machine in order to use at least one of the following criteria:

a) thermal load on the shingraft drive b) thermal load on the weaving machine drive c) achievable fabric output per time (see also "Advantage 2") d) load on the electrical supply network in peak and / or consumption e) air consumption of the air jet loom

optionally the asynchronous or the synchronous speed change, depending on the determined result of the computer means execute. The inventive method is in at least one of its embodiments as a work base the aforementioned computer means known.

On the air consumption is mainly influenced by the inventive method in such a way that according to the inventive method, the speed of the shedding machine at least twice as high as the speed of the loom can be selected and the shed change, as already shown in Advantage 1, completed correspondingly faster can be. This means that the weft insertion window becomes larger in time; it opens up the possibility to enter the weft slower and with less air requirement.

FIG. 6 shows the preferred type of shed change described under FIG. Here, 6.1 shows the shed change according to speed n51_fbm. The time span from one closure 6.5 to the next is designated Δt61. In the course of the rotation speed change according to the invention, no shed change is carried out from the time t51, ie a shed change which may still still be carried out at t51 is brought to an end; Thereafter, the subject is kept open and the next shed change is started only at a time that it is at the earliest completed at time t52. In this case, the time span from one technical degree to the next following technical qualification is designated Δt62. Takes place both of the speed change of the shedding machine as well as the speed change of the weaving machine, as shown, ramp-shaped, the shedding machine and ΔαWM the loom applies to the to the time t52 covered between the time t51 angle ranges ΔαFBM the relationship ΔαFBM: ΔOCWM = (Π _1FB M ⁺ ΓI2FBM) ■ ( ^Π IWM ⁺ Π ₂ WM) = (N + Nk): (N + k), where k = n52_fbm: n51_fbm. For this relationship Δα _FBM : ΔOC _W M = (N + Nk): (N + k) gives the ratio between Δt62 and Δt61 when represented as a fraction with the smallest possible natural numbers in numerator and denominator, the natural number ZN51 forming the counter at; the following applies: Δt62 = ZN51 Δt61. If the time interval AT = t52 - 151, for example, from the perspective of the operator of the loom too long, the drive of the Web and / or shedding machine departing from the ramp-speed curve, so that the relationship ΔCC _F BM ■ "Δα _{World Cup} when plotted as Fraction with the least possible natural numerals in numerator and denominator as a denominator has a natural number NN52 which is correspondingly smaller than NN51 (see Figure 5) and as counter ZN52, then: Δt62 = ZN52 ^• Δt61 In the range from t52 to t53 the shed change takes place at least only all N

Working revolutions of the drive shaft of the shedding machine. For this case: Δt63 = N ^• Δt61, Δt63 wherein the period of time from a shed closing for the next shed closing is indeed to t63, or when the loom, the rotational speed has n52_wm and in the area t52.

In the course of the rotation speed change according to the invention, no shed change is carried out from t53, ie a shed change which may still be present at t53 is brought to an end; Thereafter, the shed is kept open and the next shed change is started only at a time that this is at the earliest completed at time t54. In this case, the time span from the technical closure at time t53 to the next following technical conclusion at time t54 is designated Δt64. If both the speed change of the shedding machine and the speed change of the weaving machine ramps, so applies for the between the time t53 to time t54 angle ranges ΔOC _FB M the shedding machine and Δα _{WM of} the weaving machine, the relationship ΔOCFBM: Δα _WM = (Π _1FB M + Π ₂ FBM): (ΠIWM + Π ₂ WM) = (N + Nk): (N + k), where k = n52_fbm: n51_fbm. For this relationship ΔOCFBM: ΔOCWM = (N + Nk): (N + k) gives the ratio between Δt62 and Δt61 when calculated as a fraction with the smallest possible natural numbers in numerator and denominator, thereby forming the numerator natural number ZN51; the following applies: Δt62 = ZN51 - Δt61. If the time interval ΔT = t54-153 is too long, for example, from the point of view of the operator of the weaving machine, then the ramp-shaped speed curve for the weaving and / or weaving machine will be used

Deviated imaging machine, so that the relationship ΔOC _FB M: Δα _W wι when represented as a fraction with the smallest possible natural numbers in numerator and denominator denominator a natural number NN53, which is correspondingly smaller than NN51 (see Figure 5) and as a counter ZN53. Then: Δt62 = ZN53 ^• Δt61.

Reference to FIGS. 5 and 6:

The ramp-shaped speed change of the drive of the loom can each with the

Leaf start and / or end; but this does not have to be the case.

FIG. 7 shows an example of the method according to the invention, in which the speed n71_wm of the weaving machine and the speed n71_fbm of the shedding machine are the same until the time t71.

In the range from t71 to t72, the speed of the shedding machine changes from n71_fbm to n72_fbm and the speed of the weaving machine from n71_wm to n72_wm. The following applies: n72_wm: n72_fbm = N; N of course and> 1. In the range from t72 to t73, the shed change takes place at least only every N work revolutions of the drive shaft of the weaving machine, ie at N = 2 at least every second work revolution.

The application of the method according to the invention according to FIG. 7 can then make sense if 2 or more shots per compartment have to be entered. In the range of t73 to t74, the weaving machine again reduces its speed from n72_wm to n71_wm; the speed of the shedding machine increases from n72_fbm to n71_fbm. The speed changes of the weaving machine in the range of t71 to t72 and in the range of t73 to t74 are each shown in a ramp; they can also have other forms of progression, cf. Description of Figure 3.

The process of the invention was shown except for the comments on Advantage 1 and Advantage 2 of application examples in which weaving and / or shedding machine perform a first speed change and hereafter return to its first speed with a second D rehzahl change. The method according to the invention is separately applicable for any necessary speed change of weaving and / or shedding machine, i. Of course, it can also be used if a third speed constellation is changed during a subsequent speed change.

Example 1:

Phase 1 until time t81 n81_wm = 900min-1 n81_fbm = n81_wm = 900min-1 phase 2 (speed change) from time tδ1 to time tδ2 Weaving machine: from nδ1_wm to nδ2_wm; nδ2_wm = 500min-1

Shuffle engine: from nδ1_fbm to nδ2_fbm; nδ2_fbm = 1000min-1 phase 3 from time tδ2 to time tδ3 nδ2_wm = 500min-1 nδ2_fbm = 1000min-1 phase 4 (speed change) from time tδ3 to time tδ4

Weaving machine: from nδ2_wm to nδ3_wm; nδ3__wm = δ50min-1

Computing Machine: from n32_fbm to n83_fbm; nδ3_fbm = 350min-1

Example 2: Phase 1 until time t91 n91 wm = 900min-1 n91_fbm = n91_wm = 900min-1 Phase 2 (speed change) from time t91 to time t92

Weaving machine: from n91_wm to n92_wm; n92_wm = 500min-1

Computing Machine: from n91_fbm to n92_fbm; n92_fbm = 1000min-1 Phase 3 from time t92 to time t93 n92_wm = 500min ^"1 n92_fbm = 1000min ^{" 1} Phase 4 (speed change) from time t93 to time t94

Weaving machine: from n92_wm to n93_wm; n93_wm = 400min ^"1 shedding machine: from n92_fbm to n93_fbm; n93_fbm = 800min ^{" 1}

Example 3:

Phase 1 until time t101 n101_wm = 900min ^"1 n101_fbm = n101_wm = 900min ^{" 1}

Phase 2 (speed change) from time t101 to time t102 loom: from n101_wm to n102_wm; n102_wm = 500min ^"1

Computing Machine: from n101_fbm to n102_fbm; n102_fbm = 1000min ^"1 Phase 3 from time t102 to time t103 n102_wm = 500min ^{" 1} n102_fbm = 1000min ^"1 Phase 4 (speed change) from time t103 to time t104

Weaving machine: from n102_wm to n103_wm; n103_wm = 350min ^"1

Computing Machine: from n102_fbm to n103_fbm; n103_fbm = 1050min ^"1

That the speed of the shedding machine is from the time t104 three times as high as the speed of the loom.

It should also be noted that the method according to the invention is also applicable when the shed forming means, e.g. the shafts in dobby and the boards in the jacquard machine, single drives own.

It should also be noted at this point in general on the fact known in the art that both the loom and the shedding machine have components that are moved non-uniformly in most cases via gear means. These non-uniform movements may correspond to a drive shaft

Cause fluctuations in the mass moment of inertia related to this shaft. ever Depending on the size of the drive unit and depending on how these operations, it comes to more or less strong speed fluctuations on this drive shaft; This too is known from the prior art. These speed variations are not the subject of the present invention, ie when it is said that the speeds of weaving and shedding machine are the same, it is well known that there may be some deviations of the instantaneous values of the speeds of weaving and shedding machine by aforementioned speed fluctuations , Also, the speed changes treated in the present invention do not necessarily mean these speed variations; These fluctuations in speed characterize the real speed curve, even with a change in speed while; But meant by the operator of the loom required speed changes, which are in no causal and / or mandatory given relationship to the specified speed fluctuations.

Claims

claims

1. A method for operating a weaving and a shedding machine, the weaving and shedding machine each having at least one own variable-speed electric motor drive, wherein the weaving machine and the shedding machine is operated at a predetermined speed and wherein the respective drive of weaving and shedding machine is connected to an electronic control signal transmitting, characterized in that either the speed of the shedding machine Π _F BM divided by the speed of the weaving machine ΠWM or the speed nwwi divided by the speed Π _F BM gives a natural number N greater than 1, wherein the speed the loom is the speed of a real or virtual wave, which performs a full revolution per cycle of the loom, and wherein the

Speed of the shedding machine is the speed of a real or virtual wave, which performs a full revolution per working cycle of the shedding machine.

2. The method according to claim 1, characterized in that at least one speed change of weaving and shedding machine takes place asynchronously.

3. A method for operating a weaving and a shedding machine, wherein the weaving and shedding machine each has at least one own variable-speed electric motor drive, wherein the weaving machine and the shedding machine is operated at a predetermined speed and wherein the respective drive of weaving and shedding machine is connected to an electronic control signal transmitting, characterized in that at least one transition from a first operation with the speeds Π _I FBM for the shedding machine and II _I WM for the weaving machine on a second operation with the speeds Π ₂ FBM and Π ₂ WM done , where for the first

Operation and / or for the second operation that either the speed of the shedding machine divided by the speed of the weaving machine or the speed of the loom divided by the speed of the shedding machine results in a natural number N greater than 1, wherein the speed of the loom, the speed of a real or virtual wave, which per working cycle of the weaving machine a full

Rotation, and wherein the speed of the shedding machine, the speed of a real or virtual wave, which per cycle of the shedding machine a full turn.

4. The method according to claim 3, characterized in that the transition from the first operation with the rotational speeds Π _1W M and Π _1F BM, with Π _1W M = Π _1F BM. on the second operation with the speeds Π ₂ WM and n _2FBM . where Π ₂ FBM divided by Π ₂ WM gives a natural number N greater than 1, it follows that the angle ranges ΔCC _W M and ΔCXF _B M of the real or virtual waves of the weaving and shedding machine which have passed through in the transition phase are at the end of the transitional phase to each other such that ΔOCFBM - Δα _WM = k ^• 360 °, where k is natural and k is greater than or equal to 1.

5. The method according to claim 3, characterized in that the transition from the first operation with the speeds Π _1W M and Π _1FB M, where Π _1W M = Π ^ _B M, on the second operation with the speeds Π _2W M and Π ₂ FBM. where Π _2W M divided by Π _2F BM gives a natural number N greater than 1, it follows that the angular ranges Δα _WM and ΔCC _FB M of the real or virtual waves of the weaving and shedding machine in the transition phase are such at the end of the transition phase to each other, that ΔCXWM - ΔOCF _B M ⁼ k ^• 360 °, where k is natural and k is greater than or equal to 1.

6. The method according to claim 3, characterized in that the transition from the second operation with the speeds n ₂ wwι and n _2FBM , on the first operation with the speeds Π _1V VM and n _1FBM , so carried out that the angle _{ranges covered} in the transition _phase Δαwiw and Δα _{FBM of} the real or virtual waves of weaving and shedding machine behave towards each other at the end of the transition phase such that ΔCC _FB M - ΔOCWM = k ^■ 360 °, where k is natural and k is greater than or equal to 1.

7. The method according to claim 3, characterized in that the transition from the second operation with the speeds n _2WM and n _2FB wι on the first operation with the

_Speeds Π _1W M and n _{1FBM are} such that the angle ranges ΔOCWM and ΔOCFBM of the real or virtual waves of the weaving and _{shedding machine} , which are covered in the transition phase, behave towards each other at the end of the transition phase such that ΔCC _W M - ΔCCFBM = k ^■ 360 ° where k is natural and k is greater than or equal to 1.

8. The method according to at least one of claims 4 or 6, characterized in that between Δα _FBM and Δαwwi the relationship ΔOCFBM: ΔOCWM =

(niFBM ⁺ Π ₂ FBM) ^" ■ (niwM + Π ₂ WM).

9. The method according to at least one of claims 5 or 7, characterized in that between ΔOG _W M and ΔCCF _B M the relationship ΔOCWM: ΔOCF _B M = (Π-IWM ⁺ Π ₂ WM): (ΠIFBM + Π ₂ FBM) applies ,

10. The method according to any one of claims 3 to 9, characterized in that n- | _FBM

= n ₂ FBM applies.

11. The method according to any one of claims 3 to 9, characterized in that n _1WM

12. The method according to claim 1, characterized in that Π _F BM divided by Π _W M = Ni, and that a shed change takes place at least every Nj working cycles of the shedding machine.

13. The method according to at least one of claims 2 to 12, characterized in that during the speed change of the weaving and / or the shedding machine a shed change is omitted.

14. The method according to any one of claims 2 to 11, characterized in that a speed change of weaving and / or shedding machine starts at a given for the real or virtual waves of the weaving and shedding machine Winkelpositions- or time value, wherein the for the Beginning of a speed change given Winkelpositions- or time value for the real or virtual wave of the loom and the predetermined for the beginning of this speed change Winkelpositions- or time value for the real or virtual wave of

Shedding machine may be different from each other, wherein also be predetermined for the end of a speed change Winkelpositions- or time value for the real or virtual wave of the loom and the predefined for the end of this speed change Winkelpositions- or time value for the real or virtual wave of the shedding machine from each other can.

15. The method according to claim 14, characterized in that Π ₂ WM ⁼ O is.

16. The method according to any one of claims 3 to 13, characterized in that the speed change of weaving and shedding machine either takes place either asynchronously or synchronously.

17. The method according to claim 16, characterized in that the electronic control is performed manually or automatically based on a calculation performed by a computer unit, whether the speed change is to be asynchronous or synchronous, wherein in the calculation of at least one of the following

Criteria are taken into account on the basis of the respective type of speed change: a) thermal load on the sheave drive b) thermal load on the loom drive c) achievable tissue output per unit time d) load on the electrical supply network in peak and / or consumption e) air consumption in airjet looms.