ES2410830T3 - Method and device for producing effect thread in a continuous ring spinner - Google Patents

Abstract

Method in a continuous ring spinning machine with a device for the generation of adjustable yarn with variable yarn count effect, characterized in that the variable yarn count with adjustable yarn count is averaged over the length of the generated effect yarn, from such that the fineness of the thread is reduced in the thin points with respect to a nominal value and is increased in the thick points with respect to the nominal value.

Description

Method and device for producing effect thread in a continuous ring spinner.

The invention relates to methods and devices for the generation of effect yarn with variable thread fineness in an adjustable way and / or with adjustable thread twist, as well as to devices for performing these procedures in a continuous spinning machine. rings

Continuous ring spinners known as the one described in DE 40 41 301 A1 for the generation of effect yarn start from an adjustment of the article with respect to the fineness and twist of the yarn and apply the intended effects to this basic adjustment. In such cases the calculation of the production is very complicated, since it is necessary to take into account a plurality of parameters that depend on each other.

EP 1 413 655 discloses a continuous ring spinner for the generation of effect yarn with adjustable thread fineness and adjustable thread twist adjustable by a computer that, based on the parameters introduced for initial fineness or initial torsion, the intensity of the effect, the length of the effect and the number of effects per unit of length calculates control signals with which a control device is controlled to modify the stretch in the stretch train and to adjust the feed . The control device then controls, in turn, by means of adjusting members the drives of the cylinders of the stretch train. For the determination of the theoretical fineness of the thread at the thick points the nominal fineness of the thread is multiplied by a factor and the fineness of the thread at the thin points corresponds to the nominal fineness of the thread. Therefore, the problem described above is also presented here.

The invention was proposed, therefore, in order to indicate a possibility to easily calculate the production when effect yarn is generated with fineness of the variable thread and / or with twist of the variable thread. This object is carried out by procedures with the characteristics indicated in claims 1 to 3. Devices for carrying out the procedures are the content of claims 4 to 7.

If, according to claims 1 or 4, a wire with a mass effect must be generated, that is to say with thick points, the parameters of these thick points, such as their thickness, their length and their distance from each other, can be introduced into the computer. So that these thick points do not raise the total fineness of the generated thread resulting from the model and the adjusted stretch, the computer determines for the thin points, that is for the thread sectors between the thick points, that smaller fineness for which the fineness Complete the thread including the thick stitches corresponding back to that of the initial thread. It therefore raises the stretch in the area of the thin points and thus maintains the production to the originally adjusted value.

The computer is designed so that it also controls the control members actuated by it, so that the twist in the thread can be modified in an adjustable manner. Torsion variation can be done alone. It can be achieved by changing the number of spindle revolutions. Since this modification due to the large mass of the movable spindles is carried out, however, very slowly it is preferably provided that the variation of the torsion is achieved by the variation of the feeding of the stretching train.

Generally, variations in the mass of the yarn are combined with synchronous variations in the twist thereof. Thus, the torque variations foreseen in each case can be introduced into the computer. But it is preferably provided to prepare the computer to calculate the torsion variations based on the mass variations and transmit them as control signals, so that the torsion coefficient, the so-called alpha factor, remains constant.

The effects of mass without simultaneous variation of torsion can be maintained very briefly. In case of torsion variations, it should be taken into account that they try to compensate in the thread sector in the pair of output cylinders and the spindle and also preferably go to the thin sections of the thread. Torsion only variations and mass variations with simultaneous torsion variation are therefore preferably performed gradually.

The continuous ring spinning machine provided for performing the procedure has a device for automatically modifying the stretching. For this, it is provided that the output cylinders on the one hand and the input and central cylinders on the other hand have separate drives. It is envisaged that the input and central cylinders, or also the output cylinder, have for this purpose a drive that can vary the number of revolutions in particular in the form of frequency controlled drive motors that can be driven by a control device. With adjustable frequency power supply.

For the automatic variation of the twist of the thread per unit of length, the continuous ring spinner is equipped with a drive of the stretching train that can vary the number of revolutions. When the input and central cylinder, as well as the output cylinder, have drives to modify the stretch that can already vary the number of revolutions, there is a device in the computer that allows synchronous variation of the stretch. Preferably, frequency controlled motors are also provided here. Alternatively, the variation of the twist of the yarn per unit length can also be achieved if the number of

Spindle revolutions. For this, its drive motors by means of the control device can be operated with adjustable frequency power supply.

The computer that drives the control devices contains an algorithm to average the parameters introduced in it for the initial fineness of the thread, effect intensity, the effect length and the number of effects per unit length. In addition, the feeding of the stretching train or the number of spindle revolutions may vary depending on the mass variations.

In order to achieve a random distribution of the mass variations and / or of the torsion variations, it is preferably provided to subordinate a random number generator online to the computer. In this case only limit values of the mass variations are predefined in the computer, within which the random number generator produces random values.

Examples of embodiment of the invention are shown in the figures of the drawing and the tables. They show:

Fig. 1,

scheme of the hierarchy of system components,

Fig. 2,

a fineness diagram of a thread with mass variations; Y

Fig. 3,

a fineness and twist diagram of a thread with variations in mass and twist.

The abscissa of the diagrams of Figures 2 and 3 reproduce the length of the thread, while in the ordinate axis the fineness (Fig. 2 and upper line of Fig. 3) or torsion (lower line of Fig. . 3). The thick points are reproduced as elevations, therefore the fineness data is in inverse Nm.

An upper computer 1 contains a communication field 2 through which communication with the computer can be established. It essentially contains a keyboard for entering data and commands, as well as a screen that shows the adjusted values. Its important fields in the present case are reproduced in the following tables 1 and 2.

A random number generator 3 can be arranged in line with the computer. This avoids that a large number of randomly selected successive control steps must be produced and stored. The random number generator always produces new random control signals within the subordinate control devices within preset limit values.

The computer 1 with its control signals through a conduit 4 drives a first subordinate control device 5 which in turn through the conduit 6 drives an adjustment member 7 to control a motor 8 for driving the lower cylinders of entry and center 9 of a stretch train of a continuous ring spinner. Through a second conduit 10 an adjustment member 10 is controlled which drives a motor 12 of a lower outlet cylinder 13 of the stretch train. The drives are here symbolized by only one respective motor 8 or 12, however, it is understood that the drives may also comprise several motors.

Through a conduit 14, the computer 1 drives a second control device 15 which controls at least one drive motor 17 for the spindles 19 driven by a tangential belt 18 and indicated by dashed lines through an adjustment member 16. The adjustment members 7, 11 and 16 preferably comprise frequency converters that allow the motors 8, 12 and 17 to be driven, and the speed can be modified.

In the following table the image of the display box is schematically represented for the example already mentioned in the introduction. It is understood that headings may present instead of written denominations symbols that are not reproduced here.

Table 1

Thinness of the thread / Thread twisting at the thin point Nm 13.4 480 T / m effects per meter 3.44

Article

Nominal Nm Nominal torque Stage No. 1 mm length Length 2 mm Fineness% Torque%

TO

14.5 420 one 40 451 100 100

B

14.5 420 2 40 fifty 180 100

C

11.9 480

D

254.0 1944

AND

50.8 938

F

288.0 2223

G

16.5 540

H

14.4 500

In the example presented, observe article C which has a nominal Nm value of 11.9 and an unmodified nominal torque of 480 T / m. The variation program has two stages, in the first one in a range of lengths between 40 mm (length 1) and 451 mm (length 2) the fineness must be 100% and the torque 100%. In the thin point of stage 1, no variation of the fineness is therefore foreseen. In stage 2 in a range of lengths of 40 mm and 50 mm the fineness rises to 180%, that is, a thin point is generated while the torsion remains unchanged.

The random number generator 3 in the computer 1 selects, for stage 1 in the indicated length range between 40 mm and 451 mm and for stage 2 in the indicated length range between 40 mm and 50 mm, random lengths and transfers You are on the computer. This calculates the fineness at the thin point at Nm 13.4 and at the thick point at Nm 7.4 from these lengths and the mass elevation envisaged in step 2. Starting from these values, the computer 1 activates the control device 5 with corresponding signals in step 1. This controls the adjustment member 7 so as to reduce the number of revolutions of the engine 8 of the inlet and center cylinders 9, such that the fineness of the thin points rises from Nm 11.9 to Nm 13.4.

After passing the lengths of the thin points provided, the computer 1 activates the control device 5, so that this through the adjustment member 7 raises the number of revolutions of the input and central cylinders 9 for the expected length of the elevation of mass, so that the stretching in the stretching train is reduced for the exit of fineness Nm 7.44 and with it for the generation of a thin point.

The change of stages 1 and 2 is repeated continuously producing the random number generator each time another length. Computer 1 can also calculate the number of effects generated per meter and display them in the header.

In the diagram of figure 2 the thickness of a thread generated in this way is schematically represented. The dashed line 20 represents the preset fineness of Nm 11.9. From the values entered, computer 1 calculates thick points 21 of random length and random separations between them between the selected limits and - in the present case - with the same mass variation at Nm 7.4. The average fineness of the generated thread of Nm 11.9 is at the height of line 20 - the surfaces above and below this line are equal. At fine points the fineness is reduced to Nm 13.4.

In the event that a random number generator is dispensed with, so many alternative steps must be introduced per line that the printing of a periodicity is avoided. The number of stages that are scheduled at discretion can be up to forty. The number of stored items can be for example ten or even more.

Table 2

Thinness of the thread / Thread twisting at the thin point 21.7 504 Effects per meter 0.97

Article

Nominal Nm Nominal torque Stage No. 1 mm length Length 2 mm Fineness% Torque%

TO

14.5 420 one 120 450 100 100

B

2 100 120 140 84

C

3 100 120 170 76

D

4 220 380 190 72

AND

5 100 120 170 76

F

6 100 120 140 84

G

H

In this example according to article A, in a thread with the nominal values Nm 14.5 and 420 T / m both fineness and twist are modified. Since a modified twist is distributed across the length of the thread between the exit of the stretch train and the spindle, a variation of the twist and thus also of the mass of the thread can only be made in small stages.

In stage 1 the length of the thin point is set between 120 mm and 450 mm - the random number generator selects a thin point length in this range. In stage 2, in a range between 100 mm and 120 mm, the fineness is raised to 140% and the torque is reduced to 84% - starting respectively with the nominal Nm and the nominal torque. In stage 3 in the same range of lengths the fineness is raised to 170% and the torque is reduced to 76%. Stage 4 represents the actual thick point in a range of lengths of 220 mm and 380 mm with an elevation of fineness to 190% and a reduction of torsion to 72%. In stages 5 and 6 the increase in mass elevation is reduced symmetrically at the thin point of stage 1. The sequence of the stages is repeated.

In the heading of the tables you can see the fineness of the thread and the twisting of the thread at the thin point, this is in the thinnest sector of the thread. The adjusted fineness and torsion values are actually averaged by the computer, so that for the production calculation it is at the nominal Nm of 14.5.

A wire of this type is schematically represented in the diagram of Fig. 3. The dashed line 23 on the upper characteristic line of the fineness again represents the initial and final fineness of the thread generated with Nm 14.5. The mass rise 24 ’and with it the reduction of the torsion 25 of the thin point is so small that the reduction of the torsion according to the characteristic line of the lower torsion can be performed in one step. On the contrary, the reduction of torsion 25 ’’ in thin point 24 ’’ is so high that it must be done here in three stages.

In the example shown, it is assumed that the computer has been prepared with a corresponding input key to calculate the reduction in torsion based on the calculated mass elevation, so that the alpha value of the generated wire remains the same. Since the average nominal fineness 23 of the yarn is maintained and also the average twist remains the same, the production can easily be determined. The fictitious thread of table 2 is therefore composed of the following fragments:

Stage 1: Nm 21.7 / 504 T / m -> Alfa 108

Stage 2: Nm 15.5 / 425 T / m -> Alfa 108

Stage 3: Nm 12.7 / 385 T / m -> Alfa 108

Stage 4: Nm 11.4 / 364 T / m -> Alfa 108

Stage 5: Nm 12.7 / 385 T / m -> Alfa 108

Stage 6: Nm 15.5 / 425 T / m -> Alfa 108

If it is planned to produce in the continuous ring spinner normal thread without effects, the stages in the computer can be adjusted accordingly. However, it is also possible to disconnect the computer - in this case the control devices 5 and 15 are provided with input devices by which their stretching and torsion can be adjusted manually.

Claims (7)

one.

Procedure in a continuous ring spinner with a device for the generation of effect thread with adjustable thread fineness in an adjustable way, characterized in that the adjustable thread fineness is averaged across the length of the generated effect thread, in such a way that the fineness of the thread is reduced in the thin points with respect to a nominal value and is increased in the thick points with respect to the nominal value.

2.

 Method according to claim 1 in a continuous ring spinner with a device for generating effect thread with adjustable thread fineness and with variable thread torsion synchronously, characterized in that the fineness of the adjusted variable thread can be assigned a twist of the variable thread in an adjustable way.

3.

 Method according to claim 2, characterized in that the computer (1) can be prepared to automatically assign a twist of the variable thread to a fineness of the calculated variable thread for which the twist coefficient (alpha value) is kept constant.

Four.

Continuous ring spinner for the generation of effect thread with variable thread fineness in an adjustable way, in which the continuous ring spinner presents a computer (1) that from the parameters introduced for the initial fineness of the thread, the intensity of the effect, the length of the effects and the number of effects per unit of thread length calculates control signals with which at least one control device (5) controls to modify the stretching in the stretching train which in turn drives automatic adjusting members (7, 11) that control the operation of at least two groups of cylinders of the stretch train, characterized in that the computer (1) is configured to average the fineness of the variable thread in an adjustable way across the length of the generated effect thread, so that the fineness of the thread is reduced in the thin points with respect to a nominal value and increased in the thick points with respect to the nominal value.

5.

Continuous ring spinning machine according to claim 4 for the generation of adjustable yarn with adjustable thread twist, characterized in that the continuous ring spinner has a computer (1) which, based on the parameters introduced for the initial twisting of the thread, the intensity of the effect, the length of the effects and the number of effects per unit of thread length calculates control signals with which the control device (5) controls to adjust the feed of the stretch train which in turn operates automatic adjustment members (7, 11) that control the drive (8, 12) of the cylinders (9, 13) of the stretch train.

6.

 Continuous ring spinner according to claim 5, characterized in that the computer (1) from the parameters introduced for twisting the wire calculates control signals with which it controls another control device (15) which in turn drives a member automatic adjustment (16) that controls the drive (17) of the spindles (19).

7.

Continuous ring spinner with a device for the generation of effect thread with variable thread fineness in an adjustable way and / or with adjustable thread twist according to one of the preceding claims, characterized in that a random number generator (3 ) is subordinated online to the computer (1) to randomly generate mass variations and / or torsion variations within predefined limits.