EP0027173A1 - Method for winding yarns - Google Patents

Abstract

In a process for winding textile threads at constant speed into wild-wound packages, so-called breathing is used to avoid hard and thickened bobbin ends. In a breathing cycle (TA), the traversing stroke length (HCH) is temporarily reduced from its maximum value (HCHmax) (= winding length) to a value between this maximum value (HCHmax) and a specified minimum value (HCHmin) in a shortening cycle (TK), extended to the maximum value (HCHmax) in an extension cycle (TL) and retained unchanged in a rest cycle. The difference between the maximum stroke length (HCHmax) and the shortest traverse stroke length of a breathing cycle (TA), referred to as the breathing stroke (ΔA), is changed several times during the production of a complete coil winding, for example non-periodically according to a random number sequence. Parallel to breathing, for the purpose of the mirror disturbance known per se, the traversing speed (VS) of the traversing thread guide can be continuously accelerated and decelerated alternately between predetermined maximum and minimum speeds. Breathing and mirror disturbance can be coordinated with one another in such a way that the times of short traversing stroke lengths coincide with times of high traversing speeds - and vice versa.

Description

The invention relates to a method and a device for winding threads, in particular man-made fibers delivered at constant speed, into wildly wound cross-wound bobbins.
in which the traversing stroke length is temporarily shortened in a shortening cycle in the range of a maximum difference value, is lengthened again in an extension cycle up to the predetermined maximum value and is maintained unchanged in a rest cycle.

When winding threads into cross-wound bobbins, in particular cylindrical and biconical cross-wound bobbins in a wild winding, hard and, under certain circumstances, thickened areas arise on the end edges of the bobbins. You counter this with the so-called "breathing". The breathing stroke length is temporarily shortened during breathing. The respiratory tract or respiratory stroke (traverse stroke shortening, stroke shortening) depends on the titer. Shortenings up to 10 mm are conceivable.

It has been found that breathing according to the known method of working causes the problem of thickened and hardened areas of a cheese has not yet completely released. Rather, it is sometimes observed that hardened areas form both on the front edges of the coil and at the end of the breathing path.

To solve this problem, it is proposed according to the invention that the breathing stroke is changed several times as the difference between the maximum and the smallest traversing stroke length of a breathing cycle during the winding cycle.

Experiments have shown that even in the area of the coil ends a uniform hardness of the coils and an exactly cylindrical structure can be achieved.

The breathing path can preferably be changed continuously from one breathing cycle to another, in particular in a non-periodic manner. This is technically particularly solved so that a random number sequence generated by a random number generator z. B. specified directly or via a memory and the breathing path or breathing stroke is determined in the successive breathing cycles according to this random number sequence.

For this purpose, either the shortening speed can be changed according to the number sequence or random number sequence, whereby the duration of the shortening cycle of breathing remains constant, or with a constant shortening speed for the winding cycle, the duration of each shortening cycle or directly every breathing path can be changed according to the specified number sequence or random number sequence will.

The adjustment of the traversing stroke is carried out by separate stroke-reducing motors for adjusting a device such as that described, for. B. is shown in DE-PS 19 16 580. These stroke reduction motors are preferably operated at the same speed for shortening and lengthening the traversing stroke, so that the duration of the shortening cycle of breathing is equal to the duration of the extension cycle.

With breathing and in particular also with the type of breathing according to the invention, it has proven to be advantageous to keep the traversing stroke length constant for a certain time at its normal value. In the context of this application, this time of the constant maximum traversing stroke is referred to as the resting time TR. It can be provided within the scope of the invention that the ratio of rest time to the total operating time of a breathing cycle - as the sum of the duration of the shortening cycle and extension cycle - is kept constant for the entire winding cycle. This ratio, which is designated k in the context of this application, is preferably greater than 1/4 and less than 1/2.

It is possible to change the breathing path by changing the rest period. Here, the duration of the breathing cycle consisting of shortening cycle, extension cycle and resting cycle can remain constant over the winding cycle.

The invention is based on the further problem that a so-called mirror formation is possible when winding threads into cross-wound bobbins in a wild winding, in which two layers of threads lie directly one on top of the other. In this case, the bobbin and the threads are damaged. The problem of mirror formation is avoided by the so-called "mirror disturbance".

For mirror interference, the traversing speed is usually changed continuously in a predetermined range of a maximum and a minimum traversing speed.

In combination of the present invention with the older method of mirror disturbance according to DE patent application 28 55 608, mirror disturbance and breathing can be coupled with one another in such a way that the times of high traversing speed and short traversing stroke length coincide. Under the same condition, the start of each breathing cycle with the start of the acceleration of the traversing speed for the purpose of mirror disturbance can be started with two or more than two alternately controlled time relays with different time constants. It has been shown to have the best results with regard to coil structure, coil hardness and coil shape can be achieved if the breathing is changed according to the invention and coupled with the mirror disorder.

The mirror disturbance and the respiration are preferably coupled to one another in such a way that the rise clock of the mirror disturbance (ie the timing for increasing the traversing speed) and the shortening clock of breathing (ie the timing for shortening the traversing stroke) are synchronous, while the sum of extension clock ( ie the timing for the extension of the traversing stroke) and the idle clock (ie the timing of the constant maximum traversing stroke) are identical in time to the descending cycle of the mirror disturbance (ie the timing of the reduction in the traversing speed).

The method set out in claims 11 to 13 can - as proposed by claim 14 - be carried out in that the acceleration amounts and the deceleration amounts of the traversing speed remain constant during each cycle of the mirror disturbance and over all cycles of the mirror disturbance of a winding trip, the amount of the delay the traversing speed in each descent cycle of the mirror disturbance is selected such that the mirror disturbance occurs by changing the traversing speed above a minimum traversing speed which is constant for the winding travel. The amount of acceleration can preferably be greater than or at most equal to the amount of deceleration of the mirror disturbance. This proposal is characterized in that the mirror disturbance stroke, as the difference between the maximum traversing speed in each case and the minimum traversing speed which is constant over the winding travel, is proportional to the respiratory path in question. The advantage of this solution is that it is technically easy to implement. The drive for the mirror disturbance remains constant during the winding cycle. There is only a switchover from acceleration of the traversing speed to deceleration or from deceleration of the traversing speed to acceleration at the start and End time of the shortening cycle of breathing predetermined by a sequence of numbers, preferably a random number sequence, with a predetermined ratio of acceleration amount: delay amount.

Such a coupling of breathing and mirror disturbance is quite sufficient for many applications. For some applications, however, there is a disadvantage in that the average traversing speed and thus also the crossing angle can only be specified very imprecisely. If such an average traversing speed is to be predeterminable, the invention can be carried out in that - as proposed according to claim 16 - the duration of the shortening cycle of breathing is continuously changed for each breathing cycle, while the traversing speed is initially above the predetermined mean value during each shortening cycle of breathing is accelerated in such a way that the mirror disturbance stroke, as the difference between the highest and lowest traversing speed during the rise cycle, is proportional to the breathing stroke.

The deceleration amounts of the traversing speed can be continuously adapted to the maximum value of the traversing speed achieved in such a way that the maximum traversing speed and the minimum traversing speed are symmetrical to the predetermined mean traversing speed in a descent cycle.

gilt (b = Beschleunigungs-V = Verzögerungswert).In practice, this can be achieved by setting the acceleration values and the deceleration values of the traversing speed in a certain relationship to one another, such that the formula for each breathing cycle

applies (b = acceleration V = deceleration value).

In the solution specified in claims 16 to 18 the acceleration values and deceleration values in the previously described predetermined ratio depending on the minimum traversing speed initiating the respective mirror disturbance stroke and the respective mirror disturbance stroke as the difference between the maximum and the minimum traversing speed of the mirror disturbance cycle. The dependence of the acceleration values is such that a maximum traversing speed which is above the predetermined mean traversing speed is achieved in each rise cycle of the mirror disturbance. It can therefore be provided for the implementation of the invention that the controller for coupling breathing and perturbation also contains a computer which calculates the acceleration value and the deceleration value for the traversing speed with a lead time before each breathing and mirror disturbance cycle.

However, it is preferred that a sequence of numbers for the change in breathing and the values for acceleration and deceleration of the traversing speed to be assigned to this sequence of numbers are stored in a memory for synchronous retrieval.

A winding device for executing the method according to the invention is characterized on the one hand by the controllable stroke reduction motor, on the other hand by means for continuously changing the traversing speed and further by a control device by means of which the stroke reducing motor and the means for changing the traversing speed are controlled according to a predetermined program.

The invention can be carried out by a large number of controls, in which case an electronics specialist must be consulted. The control is to be carried out in such a way that it must perform the mirror disturbance and breathing functions shown in FIGS. 1 and 2.

The control will generally have to be based on a block diagram according to FIG. 3.

4 and 5 show a diagram of the traversing speed and the traversing path and as a circuit diagram for a control another embodiment.

It should be mentioned in advance that the factor k = TR / TB = 1/2 in the embodiments according to FIGS. 1 and 2.

In FIGS. 1 and 2, the letter designations mean:

• Im Rahmen dieser Beschreibung kommt die "Changiergeschwindigkeit" sowohl in Verbindung mit der Atmung als auch in Verbindung mit der Spiegelstörung vor.

Regarding the term "traversing speed", the following should be noted here:

• In the context of this description, the "traversing speed" occurs both in connection with breathing and in connection with mirror disturbance.

In connection with the mirror disturbance, the traversing speed is expressed in double strokes (back and forth stroke) per minute, also briefly referred to as the "number of strokes".

For example, a traversing device can have an average speed of 100 double strokes (DH) per minute, the number of strokes being able to move between 95 and 105 DH / min to avoid mirror formation. The traversing speed changes continuously in this area.

In connection with breathing, the traversing speed is expressed in m / min. If only breathing - so none Mirror disturbance - is used, the number of strokes (DH / min) remains constant during the winding travel, and only the traversing stroke length changes during the winding travel in time intervals. Since in this case the traversing speed (m / minJ results from: double strokes per minute [1 / min] x stroke length [m], the traversing speed also changes with changing stroke lengths.

With the combination of breathing and mirror disturbance, the traversing speed is influenced by both measures. Within the scope of this invention, only the traversing speed which can be influenced by the mirror disturbance is to be regarded as relevant and therefore to be expressed in DH / min.

The essential criterion of the mirror disturbance according to FIG. 1 is that the accelerations of the oscillation, which are represented by the rise angle α, remain constant over the entire winding travel. The same applies to the delays of the oscillation, which are represented by the descent angle β. It should be noted that alpha and beta are not the same, but that beta is preferably smaller than alpha. In principle, it is also possible to provide the control in such a way that the descent angle β is greater than the ascent angle α. For breathing, the speeds for shortening and lengthening the traversing stroke, which are each represented by the angles V and cl, are constant over the entire winding cycle.

Both the acceleration and deceleration values of the mirror disturbance and the speeds of the stroke shortening can be set for the winding travel in terms of their absolute amount. This means that according to the method of this invention only the relative values in their assignment to each other are controlled.

und

die Zeitdauer für den Verlängerungstakt und den Ruhetakt der Atmung bestimmt wird.In Fig. 1, the duration of the breathing cycle TA is variably specified from one cycle to another. This can be done by using a sequence of numbers, preferably one an arbitrary, ie non-periodic sequence of numbers, either the duration TK of the shortening cycle of each respiratory cycle or the respiratory path of each respiratory cycle, and then based on the boundary conditions

and

the length of time for the extension cycle and the rest cycle of breathing is determined.

The traversing speed is then switched to its constant predetermined acceleration value or its constant predetermined deceleration value at the beginning and end of the respective shortening cycle of breathing. The delay is calculated in advance so that the traversing speed after each full breathing cycle TA again reaches its minimum traversing speed which is constant and predetermined for the winding travel. It means that

i.e. in the given example = 2. In Fig. 1 this can be read from the fact that tan α = 2 tan β.

As can be seen from FIG. 1, no average traversing speed for the winding travel can be predetermined with this solution.

In the solution according to FIG. 2, the breathing cycle for each breathing cycle TA is in turn predefined in that either the duration of the shortening cycle TK or the respective breathing path ΔA is specified according to a random number sequence programmed into a memory.

It follows from this that in each respiratory and mirror disturbance cycle the respiratory path ΔA and the mirror disturbance stroke ΔS remain proportional to one another.

At the beginning of the shortening cycle, the oscillation is accelerated in such a way that, at the end of the shortening cycle TK and the rising cycle TAN, it is greater than the mean oscillating speed VSmittel, which is predetermined as constant for the winding cycle. The acceleration of the oscillation is therefore dependent on the minimum oscillation speed achieved at the beginning of the rise cycle and on the other hand on the length of the specified increase cycle or shortening cycle of the breathing cycle. This acceleration value of the traversing speed can either be specified with a short lead time before each shortening cycle by a computer connected to the control, which detects the minimum traversing speed at the beginning and the duration of the rise cycle. It is technically simpler, however, to calculate and store the required acceleration values of the traversing speed, which satisfy the above-mentioned condition, for the number sequence entered into a memory, which determines the shortening cycles of breathing for the entire duration of the winding travel, and also to store it with each number of the random number sequence from the Memory.

ermittelt.The deceleration values of the oscillation, which are represented by the angle, are chosen for each descent cycle of the mirror disturbance so that the maximum traversing speed and the minimum traversing speed of this descent cycle are symmetrical to the average traversing speed indicated for the winding travel. In order to achieve this, a prediction of the delay value, which is represented by the Tan gene, is again required. Again, this can also be done by a computer which, on the one hand, records the maximum traversing speed of the mirror disturbance clock as well as the time period TK or TAN of the rise clock and therefrom

determined.

Corresponding values can, however, also be calculated in advance and then again entered into a memory with the corresponding acceleration values and specified for the mirror disturbance with each descent cycle of the control device.

This ensures that the traversing speed always oscillates around an average value, so that the coil is to be built up with a pre-calculated average crossing angle.

In the block diagram according to FIG. 3, the frequency generator 1 and the counter 2 generate an actual time signal which is given to the changeover switch 3. A set time signal is generated by the time preset memory 4 and is likewise given to the changeover switch 3. In accordance with the actual time signal, the breathing control 6 is first switched to shortening and then to an extension of the traversing stroke and then to a constant traversing stroke. The duration of the shortening cycle TK, extension cycle TL and rest cycle TR can be stored directly in the time preset memory 4.

The output signal of the changeover switch 3 is simultaneously given to a timer 5 which, via the converter 7, gives a positive or negative voltage signal to the control device 8 for the mirror disturbance in alternating sequence if the target time signal and the actual time signal match. The amplitude of the mirror interference can be influenced by the additional control device 9.

In this form, the control device can be used for the embodiment of the invention described with reference to FIG. 1.

In order to carry out the invention according to FIG. 2, the control is to be supplemented by a memory device 10, which converts the output signal of the converter 7 in such a way that the mirror interference is operated with the precalculated acceleration and deceleration values.

In FIG. 4, the traversing speed between the maximum value VSmax and the minimum value of the traversing speed VSmin is continuously changed in constant time cycles TS for the purpose of mirror interference. For this purpose, the drive motor receives an additional control pulse during the time period TAN for the purpose of its acceleration on a control line 15 (FIG. 5), which is eliminated during the deceleration phase TAB.

The breathing cycle is identical to the mirror disturbance cycle. In the exemplary embodiment, the breathing path is continuously changed in four stages between a maximum breathing path HCHmax and a minimum breathing path HCHmin. This is done by starting each breathing cycle with a rest period TRA, for which four different values are preprogrammed. Otherwise, the motor, which causes the change in the traversing stroke, is switched so that it changes its direction of rotation due to the loss of the pulse on the control line 15 and thus increases the traversing path again until it reaches a limit switch 43 (FIG. 5) drives, which puts the lifting motor out of operation again. It then remains out of operation for the time period TRE until the next breathing cycle is started with another of the preprogrammed resting times TRA.

This breathing with a changed breathing path and its synchronization with the mirror disturbance is carried out by a circuit according to FIG. 5. The heart of this circuit is the timing relays 11, 12, 13 and 14, to which different time constants are programmed. These time constants correspond to the initial rest periods TRA1, TRA2, TRA 3, TRA4. These time relays 11 to 14 are controlled by the so-called step-up relays 16 and 17 as a function of the pulse on the control line 15.

Step-by-step relays are commercially available components that assume a predetermined switching position due to an input pulse and which are retained even when the pulse is removed.

The switching relays 22 to 25 are controlled by the switching relays 16 and 17 via the switches 18 to 21. Relays operate the switches

These switches 26 to 33 are connected in series upstream of the time relays in pairs. The lines 34 to 37 come from a control transformer, not shown. The impulses on the control line 15 determine the start of the cycle for the mirror disturbance and breathing and, in addition, also the changeover time for the delay of the mirror disturbance and the extension of the traversing path.

Due to the continuous series of pulses, the relays and timing relays are operated as follows:

Impulse actuates the relays and the timing relay

The time relays 11 to 14 control corresponding switches 11-14 after the preset claim time TRA1 to TRA4 has elapsed. These switches set the lifting motor (breathing motor) 38 in the direction of rotation 39 for reducing the traversing stroke by means of the relay 40 and the switch 41 when or since the switch 42 is closed by the control pulse on the line 15. As soon as the pulse on the line 15 drops, the switch 42 is opened, but since the lifting motor 38 has now moved away from the limit switch 43, the lifting motor 38 with the direction of rotation 46 is now used via the relay 44 and the switch 45 to increase the traversing stroke switched. The lifting motor 38 remains in operation until it opens the limit switch 43 again. He will put back into operation when another time relay is activated and the control pulse on line 15 reappears. The lines 47 and 48, via which the lifting motor 38 is controlled on the one hand by the time relays and on the other hand by the limit switch, are interlocked with one another by the already described relays 40 and 44 and the switches 49, 50.

It has been found that the change in the breathing path between two, three, four or another limited plurality of values in many areas of application - such as e.g. B. when winding textured by false twisting man-made fibers - can achieve a very good winding structure without thickened edges, running difficulties or damage to the thread.

In other areas of application of the invention - such as. B. when winding up smooth man-made fibers - a continuous and possibly non-periodically repeating change of the respiratory tract is preferable, the required technical effort being adapted to the requirements of the winding process.

List of reference symbols

• 1 frequency transmitter
• 2 counters
• 3 switches
• 4 time memory
• 5 timers
• 6 breath control
• 7 converters
• 8 control device
• 9 Additional control device
• 10 storage device
• 11 time relays
• 12 time relays
• 13 time relays
• 14 time relays
• 15 control line
• 16 switching relays
• 17 step relay
• 18 switches
• 19 switches
• 20 switches
• 21 switches
• 22 switching relays
• 23 switching relays
• 24 switching relays
• 25 switching relays
• 26 switches
• 27 switches
• 28 switches
• 29 switches
• 30 switches
• 31 switches
• 32 switches
• 33 switches
• 34 lines
• 35 lines
• 36 lines
• 37 lines
• 38 breathing motor, lifting motor
• 39 Direction of rotation for traverse stroke reduction
• 40 relays
• 41 switches
• 42 switches
• 43 limit switches
• 44 relays
• 45 switches
• 46 Direction of rotation for increasing the traverse stroke
• 47 line
• 48 line
• 49 switches
• 50 switches

Claims (20)

1. Method for winding threads, in particular man-made fibers delivered at a constant speed, to wild-wound packages,
in which the traversing stroke length is temporarily shortened in a shortening cycle in the range of a maximum difference value,
is extended to the specified maximum value in an extension cycle and is maintained unchanged in a rest cycle (breathing),
characterized,
that the breathing stroke (4A) as the difference between the maximum and the smallest traversing stroke length of a breathing cycle (TA) is changed several times during the winding cycle. 2. The method according to claim 1,
characterized,
that the breathing stroke (AA) is continuously changed from one breathing cycle (TA) to the other. 3. The method according to claim 1 or 2,
characterized,
that the breathing stroke (ΔA) is changed periodically. 4. The method according to any one of claims 1 to 3,
characterized,
that the change in the breathing stroke (ΔA) takes place by changing the rate of shortening with a constant rate of shortening cycle (TK). 5. The method according to any one of claims 1 to 3,
characterized,
that the change in the breath (AA) takes place by changing the shortening cycle time (TK) at a constant shortening rate. 6. The method according to one or more of the preceding claims,
characterized,
that for breathing the duration of the shortening cycle (TK) is equal to the duration of the extension cycle (TL). 7. The method according to one or more of the preceding claims,
characterized,
that each breathing cycle (TA) consists of a shortening cycle with the time period TK, a lengthening cycle of the same time period TL = TK and a rest cycle with the time period TR, with the ratio for the entire winding cycle being the ratio

is kept constant. 8. The method according to claim 6,
characterized,
that applies:

9. The method according to any one of claims 1 to 3,
characterized,
that the change in the breathing stroke (ΔA) takes place by changing the rest cycle duration (TR). 10. The method according to claim 9,
characterized,
that the duration of the breathing cycle (TA) consisting of shortening cycle (TK), extension cycle (TL) and resting cycle (TR) remains constant over the winding cycle. 11. The method according to one or more of the preceding claims 1 to 10,
characterized,
that the traversing speed (VS) accelerates - in order to prevent mirror formation - in the range between a maximum value (VSmax) and a minimum value (VSmin) in a constantly recurring sequence in a rising cycle (TAN)
and is delayed in a descent cycle (TAB),
and that mirror disturbance and breathing are coupled with one another in such a way that the times of high traversing speed (VS) and short traversing stroke length (HCH) coincide. 12. The method according to claim 10 or 11,
characterized,
that the start of each breathing cycle (TA) with the start of acceleration of the traversing speed (VS) for the purpose of mirror disturbance via two or more alternately controlled time relays (11, 12, 13, 14) with differently controlled time constants
is started,
mirror disturbance and breathing are coupled in such a way that the times
high traversing speed (VS) and short traversing stroke length (HCH) coincide. 13. The method according to claim 4,
characterized,
that the rise clock (TAN) of the mirror disturbance and the shortening stroke (TK) of the breathing take place synchronously, and that the extension stroke (TL) and the rest stroke (TR) of the respiration are temporally in the descent stroke (TAB) of the mirror disturbance. 14. The method according to claim 11 or 13,
characterized,
that the acceleration amounts and the deceleration amounts of the traversing speed (VS)
are constant during each cycle (TS) and over all cycles (TS) of the mirror disturbance,
and that the amount of deceleration of the traversing speed (VS) is chosen in each descent cycle (TAB) of the mirror disturbance,
that the mirror disorder due to change
the traversing speed (VS) takes place above a minimum traversing speed which is constant for the winding travel. 15. The method according to claim 11,
characterized,
that the acceleration amount is greater than or equal to the deceleration amount of the mirror disturbance. 16. The method according to any one of claims 11 or 13, characterized in
that the duration (TK) of the shortening cycle of breathing is changed for each breathing cycle (TA), and that the traversing speed (VS) during the shortening cycle (TK) of breathing is accelerated beyond a predetermined mean value such that the mirror disturbance stroke (ΔS) as Difference between the highest and lowest traversing speed (VS) during a rise cycle (TAN) proportional to the breathing path (AA) as a difference between the largest and smallest medium length (traverse stroke) during the synchronous shortening cycle. 17. The method according to claim 16,
characterized,
that the deceleration values of the traversing speed (VS) are controlled in such a way
that the maximum values and minimum values of the traversing speed (VS) in the descent cycle (TAB) are symmetrical to the predetermined mean traversing speed. 18. The method according to claim 17,
characterized,
that the duration (TK) of the shortening cycle is controlled by a memory with a stored sequence of numbers,
and that the control of the acceleration or deceleration values for the traversing speed (VS) as a function of the difference
the sequence of numbers determining the respective shortening cycle (TK). 19. Device for performing the method
according to claim 1 and one or more of the preceding claims,
characterized,
that the winding device has a stroke reducing motor which controls the stroke length (HCH) independently of the operation of the traversing device and devices for changing the traversing speed (VS) in the range of a predetermined maximum (VSmax) and minimum value (VSmin) as well as control devices by which the stroke reducing motor and the establishment
to change the traversing speed (VS) can be controlled according to a predetermined program.

Images