DE2914924A1 - Winding control - has induction motor to alter reciprocating guide slip at each winding station - Google Patents

Abstract

The slip is altered by varying the voltage applied to the coils of the induction motor, and the coils are alternately connected to two current supplies with identical frequencies. The winding unit has a preset frequency generator, and the reciprocating guide is connected to the frequency generator by one of the two current supplies. The supply circuits have different voltages through transformers located behind the frequency generator and there is a change-over switch to connect one or other of the two circuits. This change-over switch changes the induction motor from "star" to triangle" and back. The introduction of an induction motor allows a central unit to control the constant speed of the assembly, with individual control at each winding station to ensure that the spools are wound correctly, without wobble or other irregularities.

Description

"REWINDING PITCHING"

The invention relates to a textile machine with a plurality of Spooling devices in which those produced with a constant thread running speed and / or processed threads - e.g. man-made fibers - into cross-wound bobbins be wound up. Such winding devices are particularly important during manufacture and processing of man-made fibers, but also in use for spinning. The essentials Characteristic of a wild winding is that the traversing speed in The course of the winding cycle remains essentially constant as the bobbin speed decreases. This means that the thread is always at a substantially constant angle on the Bobbin is deposited. In contrast to this is the so-called precision winding ", at which the traversing speed in the course of the winding cycle increases with the Bobbin diameter changes, so that the angle of deposit in the course of the winding cycle always becomes sharper.

With the so-called "wild winding" there is the problem of the "mirror". This problem is described, for example, in DE-OS 21 65 045. Mirrors occur if there are integral winding ratios in the course of the winding cycle - in the following also Crossing conditions called - result.

The winding or crossing ratio is defined as k = ns: DH, where n5 is the speed of the winding spindle per minute and DH is the number of back and forth traversing movements of the traversing device, i.e. the number of double strokes of the traversing device per minute is.

The so-called "mirrors" are optical on the surface of the coil visible. They lead when winding, especially at high thread speeds, as they occur today in the manufacture and processing of chemical fibers mechanical engineering Problems due to the fact that vibrations also occur in the area of the resulting mirrors. These vibrations in turn lead to damage to the thread. Otherwise cause the mirrors always have difficulties pulling the thread from the bobbin.

DE-OS 21 65 045 measures to avoid mirrors have been proposed, which, however, cannot be carried out in practice, because in today's thread production and processing machines and especially in man-made fiber technology always has a large number of on spool inrichtunqen related are for the proposed by DE-OS 21 65 045 a corresponding number of control devices is required.

A winding device is known from Ut PS 3 638 872 in which the drive motors for the bobbin or the drive roller driving the bobbin on the one hand and the traversing device, on the other hand, are three-phase motors. Both engines are controlled depending on the frequency. An adjustable frequency generator is used for control, which is assigned a plurality of winding positions.

In such textile machines, a so-called mirror malfunction becomes "Wobbelung" carried out, in which the channel speed between a blind speed and a maximum speed (wobble range) according to a predetermined law (e.g. sine, sawtooth, etc.) is changed. The wobble stroke is usually - + 1% up to f 5% of the middle i.e.

Base speed. The disadvantage of this method is that the Areas with mirror formation only briefly but with constant repetition be driven through. For example, if there is a 4th order mirror without mirror interference for a period of a minute so it can be with wobbling to one Multiplying this mirror duration can come through without the symptoms of the mirror the wobble can be significantly reduced.

The German patent application file number P 28 55 616.3 = (Ba. 1100) it is also known to perform liobbeluna in a non-periodic manner, by the turning points, in which the chanqier speed in each case its maximum or has their minimum, either at non-recurring time intervals follow, or have non-recurring values.

Even with this type of wobble, integral winding ratios are used drive through. However, it is possible to use the effects of these integer winding ratios thereby to reduce to a minimum that the law according to which the traversing speed is changed, has no periodicity and therefore also possibly repetitions of mirror states are not periodic.

With the invention specified in claim 1 is a contrast technically simple winding device with control device created that the use of any of the previously known methods to prevent or disrupt the Mirroring is permitted, both periodic and non-periodic Wobbelung to mirror interference and in particular the application of the DE-OS 21 65 045 described method, according to which the winding ratio within not controlled by integer ratios and thereby preventing a mirror formation. This means that it is possible with the solution according to the invention, the traversing speed, in other words the number of double strokes per minute, to be changed as soon as an integer Aufspulverhä.ltnis or crossing ratio to be reached. It will be with the Aufspulvorrichtunq according to the invention possible, this method for off a variety of Aufspuleinrichtunven existing thread production or thread processing without a technical and economical an impracticable multiplication of the control devices becomes necessary. It can with the winding device according to the invention an individual control of each winding device take place, although the basic speeds of the winding device through a central Control device are controlled.

According to the invention, which is a central control device for a A plurality of winding devices preferably designed as a frequency transmitter, by the drive speed of the drive roller driving the bobbin surface and the drive speed of the traversing device is determined and kept constant will. The invention is based on the knowledge that also be a given frequency the speed of an asynchronous motor by changing the slip in certain Limits can be changed. The invention therefore creates the possibility that with preset central control of the assigned winding devices Change in the slip of the asynchronous motor of the traversing device for each winding device an individual interference or avoidance of mirrors can be carried out.

To change the slip, it is proposed on the one hand that the Asynchronous motors of the traversing device each alternately from star can be switched to triangle and vice versa. It is well known that a delta connection the applied torque of the synchronous motor is greater and thus the slip is less than with star connection.

To change the slip, it is also proposed that the Asynchronous motors of the traversing devices respectively for yourself a network of lower and higher voltage and vice versa can be laid. this will preferably achieved in that of the frequency-controlled main network via a Transformer a control network with higher or lower voltage is branched off.

As proposed by claim 6, the slip can be constant can be changed between a maximum and a minimum value. This kind of Change in the slip can always be the same according to the type of wobble that has been customary up to now Take place at intervals. However, non-recurring time intervals can also be introduced will. The control of the slip is preferably carried out in such a way that there are no integer Winding or Intersection conditions appear. To this end, it is proposed that each individual winding device with a scanning device for the bobbin thickness and is provided with a control device which, for certain, previously calculated Coil diameter changes the slip. This is based on the knowledge that the Speed of the winding spindle depends on the diameter. With a given traversing speed it can therefore be calculated for which coil diameters integer crossing ratios appear. Another preferred option for integer winding ratios prevent, is that the control of the slip by a vibration sensor, preferably an amplitude transducer that measures the vibrations of the winding device, in particular the winding spindle is detected and when certain predetermined values are exceeded Limit values changed the slip. Furthermore, there is the lack of integer To prevent winding conditions that with a given yarn denier and given The times in which with the occurrence of mirrors is to be expected, and that then the slip by a corresponding preset timer is controlled.

The preferred solution for avoiding mirrors provides that the Speed of the winding spindle and traversing drive are compared with each other that when reaching predetermined speed ratios in those with the occurrence of Mirroring is to be expected, control signals are generated through which the slip changes will.

In the following, embodiments of the invention are based on the Drawings described.

1 shows a winding device with the schematic representation of devices for speed control and mirror suppression; Fig. 2 shows a textile machine with the schematic representation of devices for Speed control and mirror suppression; 3 shows the block diagram means for suppressing mirrors; Fig. 4 Fig. 4a is a diagram for Representation of the speed reduction before a possible mirror formation.

In Figure 1, a single winding device is shown schematically. The winding device times the bobbin 1, which is clamped on the winding spindle 2 is. The winding spindle 2 is freely rotatable. The thread is on bobbin 1 4 wound up.

The thread 4 is passed over the length of the bobbin by a traversing device led back and forth. The traversing device consists of the reciprocating thread shaft 5 and the traversing thread guide 6 and the grooved roller 7. The traversing device is driven by the asynchronous motor 8 via drive belts 9 and 10. The coil 1 will driven on its periphery by the drive roller 11. To drive the drive roller 11 in turn is used by the synchronous motor 12.

Also an axle drive with measurement and control of a constant surface speed the coil is possible.

In man-made fiber technology in particular, it is important that the Threads are produced or processed at a constant speed. To achieve the constant speed of the drive roller 11 is used by the frequency generator 15, which is adjustable. The line network branching off from the frequency generator 18 accordingly leads on the one hand to the synchronous motor 12 and on the other hand to the asynchronous motor 8. However, a switching device 16 is connected upstream of the asynchronous motor 8, which serves the purpose of changing the slip of the asynchronous motor. This can be done by switching the asynchronous motor from star to delta (see e.g. Bergtold, The great electrical book, a.a.o.

Page 342).

The voltage converter 16 is switched over by the control device 17. The control device 17 can either be a repetitive, i. generate periodically or non-periodically repeating signal, so that the speed of the traversing devices 5 to 7 by the predetermined by the frequency generator 15 mean speed is constantly changed around the range of the slip. It all speed curves from the state of the art can be driven have become known for mirror disorder.

However, the control is preferably carried out in such a way that there are no integers Winding ratios are passed through.

In Fig. 4, 4a, an advantageous type of this control is based on the Shown in the diagram. In this diagram, curve 19 shows the course of the speed the winding spindle About the winding cycle.

As a result of the constant speed of the drive roller 11 and as a result the growing reel diameter of the coil 1 increases rotational speed the winding spindle 2 after curve 19 from. The family of straight lines 20, 21, 22, 23, 24 shows with the straight line 20 the speed of the traversing device or a corresponding one Size such as the number of double strokes per minute and with the straight lines 21, 22, 23, 24 the whole multiple of this size 1: 2 (straight line 21); 1: 3 (straight line 22); 1: 4 (Straight line 23); 1: 5 (straight 24). As shown in Fig. 4, there is in the course of So first of all there is the danger that a mirror of the fifth order will be reached, that a winding ratio of 1: 5 is passed through. As shown in Fig. 4a, when reaching hazardous area A, i.e. when the winding ratio is e.g. Assumes value 1: 5.1, the speed is reduced by increasing the slip.

The speed on line 24 is (nO - S1), where nO is synchronous Speed of the asynchronous motor 8 and S1 the normal Schl-pf of the asynchronous motor 8 is. The reduced speed on line 24.1 is (nO - S2) where S2 is the increased Slip is. As soon as the winding spindle speed exceeds the hazardous area at a given Value such as the winding ratio 1: 4.9 leaves, the slip S2 is back to the Normal value S1 reduced. As soon as the winding ratio has reached the hazard area of the mirror of the fourth order, e.g. reaches the value 1: 4.1, takes place again a Verrrrößerunq of the slip and when leaving this danger area E.g. when reaching the winding ratio 1: 3.9 a reduction to the normal value of the slip.

A suitable block diagram is shown in FIG.

With the tachometer 25, the speed of the winding spindle is used as a frequency recorded. It can be an inductive rotary encoder, which a magnetic asymmetry of the winding spindle is detected and thereby a pulsating one Generates a signal, the frequency of which depends on the speed. That Output signal of the speed sensor 25 is amplified in the amplifier 26 and then in the frequency / voltage converter 27 converted into a voltage which represents the speed of the winding spindle. The frequency / voltage converter is connected to an adapter device 28 at the same time. Through this adapter, the preset traversing speed is the Output signal of the frequency / voltage converter 27 impressed by the fact that the Ausqangssmannunq of the converter 27 or the following amplifier 29 to one certain value is set. If, for example, the number of double strokes per minute is due to the setting of the traversing speed 1000 rpm. and the initial speed the winding spindle by setting the synchronous motor 12 12,000 rpm. amounts to so can adjust the output voltage of the converter 27 or amplifier 29 by means of an adapter 28 can be set to the value 12 volts. This output voltage is then the so-called window discriminators 30 to 37 abandoned. The window discriminators have the task of working in the danger areas for mirrors, i.e. in certain to generate an output signal which is specified via the Or link 38 and amplifier 39 as the output signal of the switching device is abandoned for the slip. As critical winding conditions are shown in If the winding ratios 1: 8, 1: 7, 1: 6, 1: 5, 1: 4, 1: 3, 1: 2 and 1: 1 are recognized. Of the Window discriminator 30 now gives when the endangered area of the winding ratio is reached 1: 8, i.e. when the output voltage of the converter 27 or amplifier 29 denotes A value of e.g. 8.1 volts is reached, an output signal to the OR element 38 and the Amplifier 39 for actuating the switching device to increase the slip. The output signal of the window discriminator 30 drops again when the hazard area is left, i.e.

if the output voltage from converter 27 or amplifier 29 e.g. has dropped to the value of 7.9 volts.

Window discriminators are commercially available components in electronics.

A NAND link, for example, can be used as an OR element.

If the output signal of the frequency / voltage converter 27 resp.

Amplifier 29 now reaches the hazard area in the winding ratio 1: 7, So if the output signal assumes the value 7.1, for example, the window discriminator gives 31 an output signal to increase the slip and this output signal falls again when the output match of frequency / voltage converter 27 or amplifier 39 drops to the value of e.g. 6.9.

The same applies to the further window discriminators 32 to 37.

In Fig. 2, a plurality of spooling devices 58 is shown, only the winding spindles 59 with bobbins 60 and the drive motor 41 for the traversing device are shown. This can be, for example, the winding devices in a spinning machine act for man-made fibers. The winding devices are otherwise as in FIG. 1 shown constructed.

The spinning machine is supplied with energy via the three-phase network 42 and the adjustable frequency generator 43. The frequency generator 43 sets the frequency of the three-phase network 42 f1 into the adjustable frequency f2 of the machine network 44 changed. A transformer 45 is connected downstream of the frequency generator 43. This Transformer 45 has AusgAnoe for the two supply networks 46 and 47. This Supply networks lead through a corresponding pre-setting on the transformer 45 different voltages. The asynchronous motors 41 can through the switching devices 48 alternately connected to one or the other supply line 46 or 47 will.

The switches 48 are operated by relays 49. Through tachometer 25, SteuereiErAchtu, nF 50 And adapter 28 will the Relay 49 activated by output signal 40.

The control device 50 consists of those in connection with Fig. 3 described components 26 to 39. The control device 50 is shown in Fig. 3 provided with a dashed border. From Fig. 2 it can be seen that the tachometer 25 and the entire control device 50 are assigned to each individual winding device are. The wetting device 28, however, can be used for a variety of winding devices be operated, as the traversing speed is also controlled by the winding devices common frequency converter 43 is fixed.

It should be noted in connection with Fig. 2 that the element 25 e.g. can also be a vibration meter that detects the vibrations of the winding spindle. In this case, the relays 49 are actuated when certain limit values are exceeded. The element 25 can also be a distance meter through which the coil thickness is detected. The relays 49 are then given when they are reached Actuated coil diameters which have previously been determined to be at risk of mirroring.

It should also be mentioned that the adaptation device 28 in FIG can also be replaced by a tachometer for the traversing device, then the output signal of the frequency / voltage converter 27 by the speed signal the traversing device is corrected.

In the block diagram of Fig. 3, the descriptions of the following can be found Components are taken - frequency / voltage converter 27 in the prospectus of the company Burr-Brown, Tucson, Arizona for "Voltage to Frequency Converter" VFC 3Z amplifiers 29: Siemens data book 1979/80 for linear circuits; Page 75 ff .: operational amplifiers TBA - Window discriminator 30 to 37: Siemens a.a.o page 194 ff.

- Or-Cied 38: CMOS Databook National Semiconductor; Page 1 to 13: MM 74 C30, 8-input NAND gate.

REFERENCE SIGNS 1 bobbin 2 winding spindle 3 traversing slide 4 thread 5 reciprocating thread shaft 6 traversing thread guide 7 grooved roller 8 drive for traversing device (asynchronous motor) 9 drive belt 10 drive belt 11 drive roller 12 drive motor for drive roller (synchronous motor) 13 carriage guide 14 three-phase network 15 frequency converter (voltage converter) 16 changeover device 17 Control device 18 Line network 19 Spindle speed 20 Traversing speed 21 22 23 24 Integer multiples of the traversing speed 25 Tachometer 26 Amplifier 27 Frequency / voltage converter 28 Adaptation device (presetting for traversing speed) 29 Amplifiers 30 to 37 Comparison devices (window discriminators) 38 (8-fold) Or link 39 Amplifier 40 Signal output to the switching device 41 Drive motor 42 Three-phase network 43 Frequency converter (frequency converter) 44 Machine network 45 Transformer 46 Supply network (three-phase network) 47 Supply network (three-phase network) 48 Switching device 49 Relay 50 Control device 5 Winding device 59 Winding spindle 60 Spool empty side

Claims (19)

Ansl? Rüche 1. Spooling device in which at constant speed approaching threads are wound into cross-wound bobbins in a wild winding, with the features: 1.1 a drive device for a winding spindle for driving the winding spindle with constant surface speed of the bobbin; 1.2 one the thread over the winding area reciprocating traversing device driven by an asynchronous motor as well as 1.3 a device for disturbing the mirror by changing the drive speed the traversing device; Characteristics: 1.4 the mirror disturbance occurs through change the slip of the asynchronous motor driving the traversing device (5, 6, 7) (8, 41). 2. Spooling device according to claim 1, characterized: the change the slip occurs by changing the on the windings of the asynchronous motor (8, 41) applied voltage. 3. On winding device according to claim 2, characterized: the windings of the asynchronous motor (8, 41) are alternated with two identical in frequency, the voltage but connected to different supply networks (46, 47). 4. Aufspuleinrichtunq according to claim 3, characteristics: 4.1 of the winding device a preset frequency generator (15, 43) is assigned; 4.2 the traversing device (5, 6, 7) of the winding device is connected to the frequency generator (15, 43) via a first Supply network (46) or second supply network (47) connected; 40 9 the supply networks (46, 47) have a transformer connected downstream of the frequency generator (15, 43) (45) a different voltage; 4.4 by a controlled switching device (16, 17; 48, 49) is the supply voltage for the first (46) or second supply network (47). 5. Spooling device according to one of claims 1 to 3, features: a switching device (16) for switching the asynchronous motor (8, 41) from "star" to "triangle" and vice versa. 6. Spooling device according to claim 1 or claim 2, features: the slip is repeatedly changed between a maximum and a minimum value. 7. Spooling device according to claim 6, characteristics: the time intervals between the times of the slip change have non-recurring values. 8. On winding device according to one or more of the preceding Claims 1 to 5, characteristic: the slip of the asynchronous motor (8, 41) is changed, when the winding ratio becomes an integer. 9. Take-up device according to claim 8, characterized in: a scanning device for the coil thickness to control the slip. 10. Spooling device according to claim 9, characteristic: a vibration sensor, preferably the winding spindle (2, 59) associated amplitude measuring transducer for control of the slip. 11. Take-up device according to claim 8, characterized in: a timer to change the slip. 12. On winding device according to claim 8, features: 12.1 comparison devices (30 to 37) to compare the speed of the winding spindle (2, 59) and traversing drive; 12.2 the comparison devices (30 to 37) give in the areas previously determined Speed ratios of the winding spindle (2, 59) and traversing drive an output signal; 12.3 a switching device (48, 49) for switching the slip is dependent controlled by the output signal. 13. On winding device according to claim 12, characteristic: the speed the traversing device (5, 6, 7) is the comparison device (30 to 37) as Fixed value specified. 14. Spooling device according to claim 11 or 12, characterized by: the Comparison institutions are window discriminators (30 to 37). 15. Spooling device according to one or more of the preceding Claims, characteristics: the winding ratios 1: 8 to 1: 1 are mirrored Changes in the slip before reaching and after leaving these winding ratios avoided. 16. Textile machine with a variety of winding devices, which are controlled according to one or more of claims 1 to 15, identifier: one A plurality of winding devices (1 to 12; 58) is a frequency generator (15, 43) assigned; each winding device (1 to 12; 58) is a control device (17, 50) to reduce the slip. 17. Textile machine according to claim 16, characterized in: each winding device A changeover switch (16) for star-delta connection is assigned to (1 to 12). 18. Textile machine according to claim 16, identifier: the Freouenzgeber (43) a transformer (45) is assigned to the second supply network (47) with a voltage which is derived from the voltage of a first supply network (46) is different; each winder (58) is a control device (50) assigned for switching from one (46) to the other supply network (47). 19. Textile machine according to claim 18, character: 19.1 of each plurality of winding devices (58) is a device (28) for specifying the number of double strokes assigned to representing signal; 19.2 the establishment is with that of each individual Spool spindle (59) associated with speed measuring devices (25) connected.