WO2006021292A1

WO2006021292A1 - Method and device for producing fancy yarn on a ring-spinning frame

Info

Publication number: WO2006021292A1
Application number: PCT/EP2005/008350
Authority: WO
Inventors: Reinhard Grauli; Gerhard Stähle
Original assignee: Saurer Gmbh & Co. Kg
Priority date: 2004-08-24
Filing date: 2005-08-02
Publication date: 2006-03-02
Also published as: JP4653171B2; CN100564625C; ES2410830T3; JP2008510895A; EP1781849B1; CN101006216A; DE102004041096A1; EP1781849A1; DE102004041096B4

Abstract

The aim of the invention is to simplify, in particular, the calculation of the production when making fancy yarn in ring-spinning frames with changes in mass and/or twist. To this end, the invention provides that control signal serve to alter the drafting and/or the ratio of the supply of yarn to the twisting of yarn by means of a computer (1) into which an algorithm is input by means of which the computer outputs control signals to downstream control devices (5, 15). The predetermined fineness is maintained by these control signals with regard to the change in mass due to the fact that the fineness in the area of the thin locations between the thick locations is reduced according to the produced thick locations. To this end, the control devices (5, 15) are designed for varying the rotational speed of the drives (8, 12) of the drafting assembly rolls (9, 13) and of the drive (17) of the spindles (19). In addition, the algorithm of the computer (1) is configured in such a manner that it allows the twist in the yarn to change according to the fineness in the yarn sections with varying mass so that the alpha value of the yarn remains the same.

Description

Method and device for producing effect yarn on a ring spinning machine

The invention relates to methods and devices for the production of Effelctgarn with adjustable changing Gamfeinheit and / or with adjustable changing Garndrehung and means for implementing these methods on a ring spinning machine.

Known Ringspinnmascliinen as described in DE 40 41 301 Al for producing effect yarn assume an article setting with respect to Gamfeinheit and rotation and put the intended effects on this basic setting. In such cases, a calculation of production is very difficult, because a variety of mutually dependent

Parameters are to be considered.

The invention was accordingly the object of a possibility for easy

Specify calculation of production if fancy yarn is produced with changing yarn count and / or with changing yarn twist. It solves this problem 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. In order that these thick places do not increase the overall fineness of the generated game resulting from the original and the set delay, the computer determines for the thin places, thus for the yarn sections between the thick places, the - lower - fineness by which the total fineness of the game 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 in rotation by changing the delivery of the drafting.

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 these try to compensate for the yarn section between the pair of outfeed rollers and the spindle and also preferentially migrate into thinner yarn sections. 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 a 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. When input and

Have center roller and output roller for changing the delay already 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 Reebner acting on 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 of length. 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.

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

Fig. 1 is the schematic hierarchy of the system components; Fig. 2 is a fineness diagram of a yarn with mass changes;

Fig. 3 is a fineness and rotation diagram of a yarn with mass and

Rotation changes.

The abscissa of the diagrams of Figures 2 and 3 shows the length of the yarn, while on the ordinate the fineness (Figure 2 and upper line of Figure 3) and the rotation (lower line of Figure 3) are removed. 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. Within random limits, the random generator automatically creates new, random control signals to downstream control devices.

The computer 1 is supplied with control signals via a line 4, a first downstream control device 5, which in turn applied via line 6, an actuator 7 for driving a motor 8 for driving input and middle sub-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 an output sub-roller 13 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 controls 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 the 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

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 mm 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 point 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 acts on the control device 5 so that it increases the speed of the input and center rollers 9 for the intended length of the mass increase via the actuator 7, 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 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 Figure 2, the thickness of such a generated game is shown schematically dar¬. 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 this 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 have to do so many alternating lines

Steps are entered 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

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 changed rotation is distributed over the yarn length between the drafting equipment outlet and the spindle, the rotation and thus also the gammage 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 in the fineness to 190% and a turning of the rotation to 72%. In steps 5 and 6, the increase in mass increase is symmetrical to the thin point of the Step 1 led back. The sequence of steps repeats itself.

From the header of the table Gamfeinheit and Garndrehung in the thin point, ie in the thinnest section of the yarn can be seen. 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 Figure 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 Twist reduction 25 "at the thick place 24" so high that it must be done in several stages - here in three stages.

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 subsections: 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

claims

1. A process on a ring spinning machine with a device for producing effect yarn with adjustable changing yarn count, characterized in that the adjustable changing yarn count over the length of the produced effect yarn is averaged such that the yarn count decreases at the thin points compared to a nominal value and the Thick areas compared to the nominal value is increased.

2. The method of claim 1 on a ring spinning machine with a device for producing Effelctgarn with adjustable changing yarn count and with concurrent, changing Garndrehung, characterized in that the set changing Garnfeinheit an adjustable changing Garndrehung can be assigned.

3. The method according to claim 2, characterized in that the computer (1) can be set to automatically assign a changing yarn count a changing yarn rotation by which the rotation coefficient (alpha value) is kept constant.

4. ring spinning machine for producing effect yarn with adjustable changing yarn count, characterized in that the ring spinning machine has a computer (1), from input parameters for output yarn count, strength of the effect, length of the effects and number of effects per unit length of the game control signals calculated, with which it controls at least one control device (5) for changing the delay in the drafting system, which in turn acts on automatic actuators (8, 10) which control the drive of at least two groups of drafting rollers.

5. Ring spinning machine for producing effect yarn with adjustable changing

Garment rotation, characterized in that the ring spinning machine comprises a computer (1) which calculates control signals from input parameters for output Gamdrehung, strength of the effect, length of the effects and number of effects per unit length of the yarn, with which he controls the control device (5) for adjusting the delivery of the drafting system, which in turn acts on automatic actuators (7, 11) which control the drive (8, 12) of the drafting rollers (9, 13).

6. ring spinning machine according spoke 5, characterized in that the calculator (1) from the input parameters for the Gamdrehung calculated control signals, with which he controls a further control device (15), in turn, an automatic actuator (16) acts upon the drive (17) controls the spindles (19).

7. ring spinning machine with a device for producing effect yarn with adjustable changing Garnfeinheit and / or with adjustable changing Gamdrehung according to any one of the preceding claims, characterized in that the computer (1) a random generator (3) for randomly generating mass changes and / or rotation changes is subordinated online within predefinable limits.