EP1781849B1 - Method and device for producing fancy yarn on a ring-spinning frame - Google Patents

Description

The invention relates to methods and devices for producing effect yarn with adjustable changing yarn count and / or with adjustable changing Garndrehung and means for implementing these methods on a ring spinning machine.

Known ring spinning machines like those in the DE 40 41 301 A1 for producing fancy yarn, starting from an item setting with regard to yarn count and rotation, and setting the intended effects to this basic setting. In such cases, it is very difficult to calculate the production because a large number of mutually dependent parameters must be taken into account.

The EP 1 413 655 discloses a ring spinning machine for producing fancy yarn of variably adjustable yarn count and adjustable yarn twisting having a computer which calculates control signals from input parameters for the output fineness, magnitude of the effect, length of the effect and number of effects per unit length with which it controls a control device to change the draft in the drafting system and to adjust the delivery. The control device then in turn controls the drives of the drafting rollers via actuators. To determine the nominal yarn fineness at the thick places, the nominal yarn count is multiplied by a factor and the yarn count at the thin places corresponds to the nominal yarn count. Thus, the problem already described above also occurs here.

The object of the invention was accordingly to provide a possibility for the simple calculation of the production, if fancy yarn is produced with changing yarn count and / or with changing yarn twist. It solves this task procedurally by the features specified in claims 1 to 3. Devices for carrying out the methods are subject matter of claims 4 to 7.

If, according to claims 1 and 4, a yarn with mass effect, ie to be produced with thick spots, the computer can be given the parameters of these thick places as their thickness, their length and their mutual distance. So that these thick places do not increase the total fineness of the produced yarn resulting from the original and the set delay, the computer determines for the thin places, thus for the yarn sections between the thick places, that - lower - fineness, by which the total fineness of the yarn including the Thick spots again corresponds to the starting yarn. It therefore increases the delay in the area of the thin points and thus keeps the production at the originally set value.

The computer is designed so that it also controls the control members acted upon by it so that the rotation in the yarn can be changed adjustable. The change of rotation can be done alone. It can be achieved by changing the speed of the spindles. However, since this change is very slow due to the large mass of the moving spindles, it is preferably provided to achieve the change of rotation by changing the delivery of the drafting system.

Most changes in the mass of the yarn are combined with concurrent changes in its rotation. The respective intended rotation changes can be given to the computer. However, it is preferably provided to give up the computer, to calculate the rotation changes as a function of the mass changes and to pass them on as control signals that the rotation coefficient of the yarn, the so-called alpha value, remains constant.

Mass effects without changing the rotation at the same time can be kept very short. When making changes to the rotation, it must be taken into account that they try to compensate for the yarn section between the pair of delivery rollers and the spindle and also preferentially migrate to thinner sections of yarn. Sole changes in rotation and mass changes with simultaneous rotation change therefore preferably take place gradually.

The ring spinning machine provided for carrying out the method has a device for automatically changing the delay. For this purpose, it is provided that the output rollers on the one hand and the input and center rollers on the other hand have separate drives. It is envisaged that the input and center rollers or the output roller for this purpose have a variable speed drive, in particular in the form of frequency-controlled drive motors, which can be acted upon by a control device with supply current adjustable frequency.

For automatically changing the yarn twist per unit length, the ring spinning machine is equipped with variable speed drive of the drafting system. If input and center roller and output roller for changing the delay already have variable speed drives, a device in the computer is available, the concurrent change of the delay allowed. Frequency-controlled motors are also preferably provided here. Alternatively, changing the yarn twist per unit length can also be achieved by changing the speed of the spindles. Your drive motors can be acted upon by the control device with supply current adjustable frequency.

The computer acting upon the controllers includes an algorithm for averaging the parameters for output yarn count, strength of the effect, length of the effects and number of effects per unit length given to it. In addition, he may change the delivery of the drafting or the speed of the spindles, depending on changes in mass, if necessary.

In order to achieve a random distribution of the mass changes and / or the rotation changes, it is preferably provided to underlay the computer a random number generator online. In this case, the computer is only given limit values of the mass changes within which the random number generator then generates random values.

Fig. 1

die schematische Hierarchie der Systembestandteile;

Fig. 2

ein Feinheitsdiagramm eines Garnes mit Masseänderungen;

Fig. 3

ein Feinheits- und Drehungsdiagramm eines Garnes mit Masse- und Drehungsänderungen.

In the figures of the drawing and the tables embodiments of the invention are shown. Show it

Fig. 1

the schematic hierarchy of the system components;

Fig. 2

a fineness diagram of a yarn with mass changes;

Fig. 3

a fineness and rotation diagram of a yarn with mass and rotation changes.

The abscissa of the diagrams of FIGS. 2 and 3 gives the length of the yarn, while on the ordinate the fineness ( FIG. 2 and upper line of the FIG. 3 ) or the rotation (lower line of FIG. 3 ) are worn away. The thick places are reproduced as elevations, therefore the fineness in Nm is inverse.

A higher-level computer 1 contains a communication field 2, via which it is possible to communicate with the computer. It basically contains a keypad for entering data and commands, as well as a screen displaying the set values. Its important fields in the present case are shown in Tables 1 and 2 below.

The computer, a random number generator 3 be backed online. This avoids having to create and store a large number of sequences of randomly selected control steps. The random generator automatically creates new, random control signals to subordinate control devices within preset limits.

The computer 1 is supplied with control signals via a line 4, a first downstream control device 5, which in turn acts on line 6, an actuator 7 for driving a motor 8 for driving input and middle bottom rollers 9 of a drafting system of a ring spinning machine. Via a second line 10, an actuator 11th controlled, which acts on a motor 12 of a Ausgangsunterwalze13 of the drafting system. The drives are here symbolized by only one motor 8 and 12, but it is understood that the drives can also include multiple motors.

Via a line 14, the computer 1 acts on a second control device 15, which activates at least one drive motor 17 via an actuator 16 for driven by means of a tangential belt 18, indicated by dotted lines spindles 19. The actuators 7, 11 and 16 preferably include frequency converters that allow variable-speed drive of the motors 8, 12 and 17.

In the following table, the image of the scoreboard for the example already given in the introduction is shown schematically. It is understood that the header instead of the names written in writing here can not be displayed symbols. Table 1 Yarn count / yarn twist in the thin spot Nm 13.4 480 T / m Effects per meter 3.44 items Nominal Nm Nominal rotation Step no. Length 1 mm Length 2 mm Fineness% Rotation% A 14.5 420 1 40 451 100 100 B 14.5 420 2 40 50 180 100 C 11.9 480 D 254.0 1944 e 50.8 938 F 288.0 2223 G 16.5 540 H 14.4 500

In the registered example, consider article C, which has a nominal Nm of 11.9 and an unchanged nominal rotation of 480 T / m. The Variation program has two steps, the first of which, in a length range between 40 mm (length 1) and 451 mm (length 2), should be 100% fineness and 100% rotation: In the thinnest part of step 1, there is no Change in fineness provided. In step 2, the fineness is to be increased to 180% in a length range of 40 mm and 50 mm, ie a thick point is to be generated, while the rotation should remain unchanged.

The random number generator 3 in the computer 1 selects for the step 1 in the specified length range between 40 mm and 451 mm and for the step 2 in the specified length range between 40 mm and 50 now random lengths and gives them to the computer in front. This calculates from these lengths and the intended increase in mass in step 2 the fineness in the thin point to Nm 13.4 and in the thick spot to Nm 7.4. Based on these values, the computer 1 acts in step 1, the control device 5 with corresponding signals. This controls the actuator 7 so that it reduces the rotational speed of the motor 8 of the input and center rollers 9 such that the thin-point fineness of Nm 11.9 is increased to Nm 13.4.

After passing through the intended thin-spot length, the computer 1 loads the control device 5 in such a way that it increases the speed of the input and center rollers 9 for the intended length of the mass increase via the actuator 7, so that the delay in the drafting system for outputting the fineness Nm 7, 44 and thus reducing the production of a thick spot.

The change of steps 1 and 2 is repeated continuously, with the random number generator generating a different length each time. The computer 1 is also able to calculate the number of generated effects per meter and to display in the header.

In the diagram of FIG. 2 The thickness of such a yarn produced is shown schematically. The dashed line 20 represents the predetermined fineness of Nm 11.9. From the values entered, the computer calculates 1 thick points 21 of random length and random mutual distance between the selected limits and - in the present case - the same mass change to Nm 7.4. The average fineness of the produced yarn of Nm 11,9 remains at the level of the line 20 - the areas above and below this line are the same. In the thin areas, the fineness is reduced to Nm 13.4.

If you do not use a random number generator, you must enter so many alternating steps line by line that the impression of periodicity is avoided. The number of steps to be programmed can be up to forty. The number of stored articles may be, for example, ten or even higher. Table 2 Yarn count / yarn twist in the thin spot 21,7 504 Effects per meter 0.97 items Nominal Nm Nominal rotation Step no. Length 1 mm Length 2 mm Fineness% Rotation% A 14.5 420 1 120 450 100 100 B 2 100 120 140 84 C 3 100 120 170 76 D 4 220 380 190 72 e 5 100 120 170 76 F 6 100 120 140 84 G H

In this example, according to Article A, both the fineness and the twist are changed for a yarn of nominal values Nm 14.5 and 420 T / m. Since a change in rotation is distributed over the yarn length between drafting equipment outlet and spindle, the rotation and thus also the yarn mass can only be changed in small steps.

In step 1, the length of the thin spot is set between 120 mm and 450 mm - the random number generator selects a thin spot length in this area. In step 2, in a range between 100 mm and 120 mm, the fineness is increased to 140% and the rotation is reduced to 84%, starting from the nominal Nm and the nominal rotation. In step 3, in the same length range, the fineness is increased to 170% and the rotation is reduced to 76%. Step 4 represents the actual thick point in a length range of 220 mm and 380 mm with an increase of the fineness to 190% and a decrease of the rotation to 72%. In steps 5 and 6 the increase of the mass increase is symmetrical to the thin spot of the Step 1 led back. The sequence of steps repeats itself.

The top row of the table shows the yarn count and yarn twist in the thin section, ie in the thinnest section of the yarn. The actually set values of fineness and rotation are averaged by the calculator so that it remains for the calculation of production at the nominal Nm of 14.5.

In the diagram of FIG. 3 such a yarn is shown schematically. The dashed line 23 in the upper fineness characteristic again represents the starting and final fineness of the yarn produced with Nm 14.5. The mass increase 24 'and thus the reduction in twist 25 of the thick spot is so small that the rotation reduction according to the lower rotation Characteristic can be done in one stage. In contrast, the Turn reduction 25 "at the thick place 24" so high that it must take place in several stages - here in three stages.

• Schritt 1: Nm 21,7 / 504 T/m -> Alpha 108
• Schritt 2: Nm 15,5/425 T/m -> Alpha 108
• Schritt 3: Nm 12,7 / 385 T/m -> Alpha 108
• Schritt 4: Nm 11,4 / 364 T/m -> Alpha 108
• Schritt 5: Nm 12,7 / 385 T/m -> Alpha 108
• Schritt 6: Nm 15,5 / 425 T/m -> Alpha 108

In the example shown, it has been assumed that the computer 1 has been given over an appropriate input key to calculate the rotation reduction as a function of the calculated increase in mass so that the alpha value of the yarn produced remains the same. Since the mean, nominal yarn fineness 23 is maintained and the average rotation remains the same, the production can be easily determined. The fictitious yarn of Table 2 is therefore composed of the following parts:

• Step 1: Nm 21.7 / 504 T / m -> Alpha 108
• Step 2: Nm 15.5 / 425 T / m -> Alpha 108
• Step 3: Nm 12.7 / 385 T / m -> Alpha 108
• Step 4: Nm 11.4 / 364 T / m -> Alpha 108
• Step 5: Nm 12.7 / 385 T / m -> Alpha 108
• Step 6: Nm 15.5 / 425 T / m -> Alpha 108

If it is intended to produce normal yarn without effects on the ring spinning machine, the steps in the computer can be adjusted accordingly. But it is also possible to turn off the computer - for this case, the control devices 5 and 15 are equipped with input devices, by means of their distortion and rotation can be adjusted manually.

Claims (7)

1. Method for a ring spinning machine with a device for producing effect yam with an adjustable changing yam fineness, characterised in that the adjustable changing yam fineness is averaged over the length of the effect yam produced, such that the yam fineness is reduced at thin points relative to a nominal value and is increased at thick points relative to the nominal value.
2. Method according to claim 1 for a ring spinning machine with a device for producing effect yam with adjustable changing yarn fineness and with synchronous changing yam twisting, characterised in that the adjustable changing yam twist can be assigned to the adjusted changing yarn fineness.
3. Method according to claim 2, characterised in that it can be entered into the computer (1) to assign the changing yam twist automatically to a calculated changing yam fineness, whereby the rotation coefficient (alpha value) is kept constant.
4. Ring spinning machine for producing effect yam with adjustable changing yarn fineness, wherein the ring spinning machine comprises a computer (1), which from entered parameters calculates control signals for the initial yam fineness, the intensity of the effect, the length of the effects and number of effects per unit of length of yam, which control signals are used to control at least one control device (5) for changing the draft in the drafting arrangement, which in turn charges automatic actuators (7, 11) which control the drive of at least two groups of drafting arrangement rollers, characterised in that the computer (1) is configured to average the adjustable changing yam fineness over the length of the produced effect yam such that the yarn fineness is reduced at the thin points relative to a nominal value and increased at the thick points relative to the nominal value.
5. Ring spinning machine according to claim 4 for producing effect yarn with adjustable changing yarn twist, characterised in that the ring spinning machine comprises a computer (1) which from entered parameters calculates control signals for the initial yarn twist, intensity of the effect, length of the effects and the number of effects per unit of length of yam, which control signals are used to control the control device (5) for adjusting the supply of the drafting arrangement, which in turn charges automatic actuators (7, 11) which control the drive (8, 12) of the drafting arrangement rollers (9,13).
6. Ring spinning machine according to claim 5, characterised in that the computer (1) calculates control signals from the entered parameters for the yam twist which are used to control a further control device (15) which in turn charges an automatic actuator (16) which controls the drive (17) of the spindles (19).
7. Ring spinning machine with a device for producing effect yarn with adjustable changing yarn fineness and/or adjustable changing yarn fineness according to one of the preceding claims, characterised in that a random generator (3) for randomly generating changes in mass and/or changes in rotation within predefined limits is subordinate online to the computer (1).

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