MXPA98002727A - Threaded appliance device with electronic control - Google Patents

Abstract

The present invention relates to the purposes of supplying yarn is provided a thread supply device that is developed, in particular, for knitting machines with needs very variable in time. The yarn supplying device has a wire wheel driven by a motor that directly supplies, in the local case, without intermediate incorporation of thread couplers, to the knitting machine or to its yarn guide. The yarn tension is controlled by means of a yarn tension sensor which constitutes the register of the measurement value of a regulator controlling the supply by the yarn wheel. In addition, the regulator is shaped so that it can process information about the need for future wire. In this way, the regulator can react prematurely, by means of an early cession or a cessation of the cession, when sudden changes of need of thread appear, as they occur, for example, periodically in the edges of the fabric in flat knitting machines (reversal points of the thread guide). So you can control spikes and sharp drops of tension. For this, the regulator can be developed so that it can work, temporarily, as a control. Other measures are also possible, such as circuits for regulating disturbing quantities, adapting parameters or similar

Description

HTLO ELECTRONIC CONTROLLED APPLIANCE DESCRIPTIVE MEMORY The invention relates to a yarn supply equipment with the attributes of the main concept of claim 1 of the patent, for the purpose of supplying, in particular, elastic and inelastic (hard) yarns, ribbons, ropes and the like. The thread supply apparatuses have the task, in the knitting machines and in the knitting machines, of driving the yarn with the required tension, at the right time and in the desired quantity to the corresponding knitting places. For this, the constancy of the thread tension essentially determines the uniformity of the obtained fabric. The oscillations in the tension of the supplied yarn can produce an essential desmerecimiento in the quality of the elaborated fabric, especially when they reproduce systematically in each row of meshes. The oscillations in the tension of the thread can occur abruptly with the consumption variable in the time of the consumption of thread. This is the case, for example, in flat knitting machines, when there is no yarn consumption for a short period of time in the reversal of the yarn guide. When the thread tension varies here, different meshes are obtained at the edges of the fabric.

The tension of the thread depends, in particular, on hard yarns, due to its lack of elasticity, of the quantity of yarn to be supplied, which must be substantially consistent with the consumption of yarn- For the cases of application with consumption of yarn. variable yarn over time the thread supply device known through DF 36 27381 was developed, which has a wire wheel driven by a synchronous motor. Fsta conducts the thread yielded by a spinning coil, through a yarn brake, to the fabric location. The thread yielded by the yarn wheel thus runs through a terminal eye of an articulated lever at its other end. The buttonhole represents an inversion point in which the thread is deflected at an acute angle. In order to keep the thread tension constant, the articulated lever is driven by a DC motor with a constant rotary moment. In addition, the articulated lever is attached to a positioner, which registers its rotational position and feeds back the control system of the synchronous motor. The lever acts, together with the sensor device, in the determination of the acting wire tension. A regulator compares the position of the articulated lever with a real value, and accelerates or retards the motor when a certain predetermined maximum or minimum value is passed. In order to compensate for these sudden variations in yarn requirements, which can not be followed instantly by the motor, due to its moment of inertia, the articulated lever forms a wire collector, which can collect an amount in an intermediate amount. limited thread. In sudden variations of yarn requirements, the articulated lever must be accelerated. The moment of inertia of the mass of the articulated lever acts on the thread tension and influences its constancy. For twisted yarns and with other effects, the thread supply device known from DE 39 20 61 R C2 is known, which has two rotating driven wheels that rotate in the opposite direction, around which the yarn is interlaced several times in shape of eight. An arm that carries an eyelet at one end, which is requested by a rotating moment in a certain direction of rotation, acts as a thread collector for the intermediate collection of the yarn not taken at times in the weaving places. The yarn runs at an acute angle through the eyelet at its end and is collected in an intermediate manner from a bolt or pillar arranged at the periphery of the arm. In the bolts or pillars that form the intermediate supplier, as well as in the eye of the arm that forms an acute angle, friction effects are produced that influence the spinning of the yarn. DE 2 06 607 A1 discloses a yarn supplying device for the simultaneous delivery of two yarns to a knitting machine, in which a yarn supplying wheel is driven by a motor with a disk rotor. From the yarn supplying wheel, at least one thread runs through the longitudinal opening of a conical or trumpet-shaped helical spring. In an articulated support located at the end of the coil spring, a permanent magnet and a Hall sensor are provided, in order to be able to record the deviations of the helical spring. With these registers, the motor with disk rotor is controlled, in order to adjust a steady state of the pre-set position of the helical spring. In this, the thread runs laterally on the inner wall, through the opening of the helical spring - the helical spring. The helical spring acts as an elastic element and reduces it, which allows a certain intermediate assembly of the delivered wire. When the supplied wire tension varies, due to the moment of inertia of the rotor-to-disk motor, the remaining wire is absorbed by the intermediate copier. Finally, through US-PS 38 58 416 a yarn supply apparatus suitable for knitting machines with an essentially constant yarn consumption and intended for the delivery of hard yarns is known. The wire supply apparatus has an electric motor controlled at its speed by the acting voltage, which, by means of a suitable wire wheel, takes spinning of a bobbin and delivers it by means of a wire tension sensor to the corresponding place of tissue. In addition, a preset timestamp is provided which is connected to a predetermined value input of a regulator by means of a switch and selectable insertable adjustment devices. This controls the motor in correspondence with a ripple-type signal of the wire voltage received through the predetermined value input of the switch. In addition, there are speed sensors in the electric motor and the knitting machine, which can be coupled in another position of the switch circuit suitable for the input of the preset value and the actual value of the regulating device. switch allows the switching of a type of operation with a wire tension held constant to a type of operation with a defined amount of thread supply. A thread supply device is assigned to each knitting area of the circular knitting machine, so that the quantity of yarn to be supplied corresponds only to the yarn consumption of a knitting location. The yarn circulation speed is suitably reduced. Measures are not considered for intermediate stockpiling of excess lengths of yarn due to the inertia of the engine or delivered characteristically or suddenly required to be transferred. The sudden changes in yarn consumption result, due to the reaction time of the regulator and the coupling, of yarn tension peaks, which can lead, in extreme cases, to the breaking of the yarn.

From this, it is the object of the invention to create a yarn supply device, by means of which knitting machines can be supplied with high speed yarns, which can be varied abruptly, avoiding stress peaks with a desired thread tension. This objective is solved by means of a yarn supplying device with the attributes of patent re vindication 1. The thread supply device is conformed as a supplier. This presents a wire wheel driven by an electric motor arranged in the path of the thread, by which it is wrapped several times. The electric motor, preferably a synchronous motor with disk rotor, is controlled by a regulating device that keeps a constant wire tension under control. In order to determine the wire tension, a voltage sensor coupled to the device is provided. regulation, which preferably has a short measuring distance. This is in the range of millimeter - In this way it is achieved that the measurement of the yarn tension can be carried out essentially with great dynamics and without causing subsequent effects. So the thread tension sensor does not make up a thread collector. The regulation device is developed in such a way that other information related to future yarn consumption can be processed together with the rea-value and the predetermined value of the yarn tension. In this way it is possible to accelerate the drive motor of the yarn wheel in time against a peak of sudden need, and to deliver yarn, to some extent, in advance. The next peak of need consumes this prearranged thread, while the drive motor accelerates again at its proper speed. In this way, the weaving process is achieved without dangerously high yarn tensions. Thus, the risk of breaking or breaking the yarn is markedly reduced and the quality of the obtained fabric is increased at the same time, with respect to the uniformity of the mesh size. There are different possibilities for the generation and processing of the signal containing information about the future consumption of yarn. The signal can be adjusted, for example, by the difference between the actual value and the pre-set value of the wire tension at the input of the regulator, the regulation can be carried out, according to the sign, by the addition or subtraction of the difference obtained or, also, through other operations. Another possibility is to relate the signal before the formation of the difference between the real value and the preset value, with the real value or with the predetermined value. In all cases, a magnitude generated by the real value, the preset value and the additional signal is created at the input of the real regulator. In simple cases, it may be sufficient to limit the information about the future consumption of yarn only to the consumption of wire previously mentioned. For this, the thread tension can be predefined for a predetermined value and / or travel voltage. Another variant consists in the intermittent massing of the wire tension signal and in the control of the drive device by means of the additional signal. The regulator then functions as a control. The additional signal may be, in a simple form, a signal containing only data about the immediately preceding thread consumption. This can be achieved with a binary signal, which modifies its value, in pre-set periods temporarily separated, before the appearance of a thread requirement. The drive motor of the wire wheel can be started or stopped prematurely by means of this signal. The linking of the binary signal or another signal with another value that contains information about the future consumption of yarn, can be carried out both with the real value and with the predetermined value. In all cases an excessive increase in the thread tension is prevented (upper peak of the thread tension), or an excessive decrease in the thread tension (lower peak of the thread tension). To compensate for the reaction time required by the motor due to its moment of inertia and, on the other hand, to its limited maximum acceleration, it can be given in advance to the regulation device, instead of a constant preset value for the wire tension , a profile of pre-set values, which overlaps with the respective expected deviations of the desired wire tension. In the simplest case, the profile of predetermined values is formed with a predetermined value of the yarn tension, which takes different values in the return and return movements of the yarn wheel in a knitting machine. The profile of the preset values can be related to the operating speed of the machine, so that the upper and lower voltage peaks are also suppressed at different operating speeds of the machines. In a variation of the embodiment, the regulator qualitatively determines the necessary amount of yarn to be supplied. To this end it stores, for example, the recorded thread tension. In the next work cycle, whose start can be indicated by a signal delivered by the knitting machine, the thread supply is initially adjusted so that the voltage peaks existing in the previous cycle are reduced or not generated. This procedure is particularly suitable for knitting machines, with which goods without drawings or merchandise with permanently repeated patterns are woven. The regulator can also selectively determine the required amount of yarn by other parameters, for example, by means of the pulses delivered to the drive motor. It is also possible to determine the regulation characteristic of the regulator and adapt it to the working conditions. The solutions mentioned above are suitable for yarn supply apparatuses that can be coupled later to knitting machines, without further operations being necessary on knitting machines. In a suitable solution also for complex yarn supply conditions, the regulator of the yarn supplying device is coupled to the pattern memory existing in the knitting machine. From the drawing to be knitted, the current and future quantity of yarn to be supplied is determined, and it is sent to the regulator as additional information for the yarn tension. Since future peaks of need or sudden requirements can be suppressed in advance, the regulator can accelerate or delay in time the drive device requested by a moment of inertia. When the thread travel between the yarn wheel and the knitting machine is formed without springs, the effects of yarn supply and influences of the moment of inertia can be reduced, which could otherwise affect the regulator. For this reason, it is also convenient that the measuring stroke of the yarn tension sensor is very small and is preferably in the range of approximately one millimeter. The measurement of the thread tension then proceeds essentially without influence of the same, that is to say, without repercussions. For the intermediate damping of yarn lengths, which represent a temporary normal deviation, an intermediate harvester may be provided. The use of the yarn supply apparatus for elastic yarns can be formed as a yarn collector or a path between the yarn wheel and the knitting machine. Thanks to the elasticity of the yarn, a certain effect is obtained from the master and the guard. A large drive dynamic is achieved when the drive device is designed as a synchronous motor. Motors with disk rotor, in particular, synchronous motors with disk rotor, they allow a fast advance and a fast braking of the wheel of thread. A filter that suppresses disturbances can be provided between the wire tension sensor and the coupled regulator. This can proceed by blocking the disturbing frequency ranges. In addition, the voltage sensor may be provided with compensation means for the purpose of suppressing disturbing signals. Embodiments of the invention are shown in the drawing. There they show: Fig, 1- in a schematic representation, a flat knitting machine with a thread supply device, which is driven by a regulator, as well as by another signal delivered by a sensor device that records the intended direction for the control of an element of the knitting machine, Fig. 2- in a schematic representation, a flat knitting machine with a wire supply apparatus according to fig. 1 and a modified regulator, which is driven by the yarn tension and by a state of movement of an element of the knitting machine pl no, Fig. 3- in a schematic representation, a knitting machine with a yarn supplying device, which is controlled by a qualified regulator, Fig. 4- in a schematic representation, a flat knitting machine with a yarn supplying device whose regulator controls the yarn tension and receives information about the yarn current and future quantity of thread required from a drawing memory of the flat knitting machine, and Fig. 5- the time course of the thread tension in the return and return movements of the thread guide of a machine of flat knitted fabric in the yarn supplying device according to fig. 1 compared to the current time course of the yarn tension in different yarn supplying devices known in the current state of the art. Fn the fig. 1 a flat knitting machine 2 with a yarn supplying device 1 is shown schematically. The flat knitting machine has at least one row 4 of knitting needles 5 arranged in a line, which exit and retract in the form of a continuous wave according to the rhythm of the machine. In the delivery of a hard thread, ie an inelastic thread 6, to the needles 5, a thread guide 7 acts, which is driven back and forth in the direction of the arrow 8. To operate the thread guide 7 a carriage 9 acts, which goes and comes along the row 4. During its tl, the carriage 9 stops the thread guide 7 at the end of the row 4, reverses its direction of tl and returns to carry the thread guide 7. This proceeds in both directions of displacement and reversal points. For the purpose of transporting and supplying the yarn 6 to the yarn guide 7, the yarn supply device has a yarn wheel 13 with a moment of inertia of its reduced mass, which is arranged in the course of the yarn and by the yarn. which is involved several times. The wire wheel 13 is constituted, for example, by six wire arms extending radially outwardly from a bushing. These have axially oriented support sections of the wire that are arranged in the corners of a regular hexahedron. The hub of the wire wheel 13 is connected to the slider of a motor with disk rotor 14, which is controlled by a regulating device 15 and forms a drive device with a reduced moment of inertia. For this purpose, the regulating device 15 is developed so that it can fully accelerate the rotor motor to disk 14, according to the needs, with which it can, however, safely maintain it in safe working ranges, so that the synchronous motor with disk rotor does not get out of its rhythm and stops unwanted. The regulation device 15 is a processor 16 for the determination of normal deviations, which can be conformed as analog, digital or computer circuit. The processor has a predetermined value input 17, an actual value input 18 and an additional input 19. the actual value input 18 may be provided with a filter 20, which acts by filtering the disturbing frequencies and is formed as a band filter, band blocker, or high or low passage. The preset value input 17 is connected to a predetermined value generator 21, which presets a fixed value for the wire tension 6. The actual value input 18 is connected to a yarn tension sensor 22 suspended against vibrations and damped, which registers the thread tension by means of a pick-up element 23. The additional input 19 is connected to a sensor device 24, dependent on the direction, provided in the flat knitting machine 2, which registers the displacement of the carriage 9 , in particular, in the investment sector, by means of a light barrier. For this, the sensor device 24 delivers a signal when the channel 9 travels a predetermined section in the direction of the arrow 25, that is to say, towards the wire guide 7. This signal is taken by the processor 16 as an additional criterion for the command of the control device 15. Furthermore, the sensor device 24 generates a curling signal of the speed of the carriage 9 passing in front of it, and the delivery to the processor 24. According to the needs, in the opposite parts in the respective The reversing point may be provided with another sensor device for registering the displacement of the carriage 9, which in turn is also connected to the processor 16. For the determination of the normal deviation to be delivered to the sensor device 15, the processor 16 forms the difference between the signals corresponding to the inputs of the preset value 17 and the actual value 18. In the stationary state of the regulator, this difference forms the normal deviation. The input 19 then acts to simulate, to some extent, a normal deviation, although the thread tension 6 has its predetermined value or is within a predetermined tolerance range. In this way, the yarn supplying device 1 can control in advance, as seen in the following description of the operation, a future sudden variation of yarn consumption. The sensor device 24 delivers a signal containing information about the previous yarn consumption. It does so, because it registers and informs the passage of the carriage 9 in the direction of the thread guide 7. The thread consumption increases shortly after this information, when the carriage 9 encounters the thread guide 7 and accelerates it abruptly in the predetermined direction, in a jump from the zero value to an approximately constant value, the signal of the sensor device 24 then indicates that this event will occur immediately. With a hard yarn, in the yarn supply set in this way the thread collector can be dispensed with, and the total yarn run can be defined up to the element 23 by fixed elements 27, 28, as well as with other elements not shown. In its details, the thread supply device 1 described hitherto works in the following manner: Fn both the sensor device 24 does not deliver a signal, the processor 16 supplies at its output a normal deviation signal, which corresponds to the difference between the wire tension determined by the wire tension sensor 22 and the predetermined value supplied by the predetermined voltage value generator 21. The normal deviation is transformed by the regulation device according to the characteristics P, Pl or PTD , and supplied as a succession of pulses to the synchronous motor with disk rotor 14 by a control circuit contained in the control device 15. The regulator can be formed as a permanent or non-permanent regulator. This transport, by means of its wire wheel 13, the exact amount of yarn that is necessary to maintain the desired yarn tension and minimize the normal deviation or make it equal to zero. The gradual and / or small variations of yarn consumption are recorded and controlled by means of the yarn tension. A sudden increase in yarn consumption from zero to maximum value occurs when carriage 9 passes before sensor device 24 in the direction of arrow 25. Here, the time lapse between the appearance of the signal generated by the sensor device 24 and 1 at sudden variation of the wire consumption depends on the distance between the connection point of the sensor device 24 and 1 to wire wheel 7, and of the carriage speed 9. The processor 16 then starts the synchronous motor with disk rotor 14 as soon as it receives the signal from the sensor device 24, or shortly thereafter, and leaves the synchronous motor with rotor to disk 14 running. a speed such that the yarn tension decreases initially and there is a certain reserve of yarn in the sector located between the yarn wheel 13 and the yarn guide 7 which prevents the appearance of excessive yarn tension. This step is shown in detail in fig. 5. For this, the curve T, marked with small circles, characterizes the behavior of the thread tension in time. While the carriage 9 encounters the thread guide 7 at the engagement point F, the synchronous motor with disk rotor 14 is started in advance at an instant S, by means of the signal from the sensor device 24- According to a pre-set profile, it initially starts slowly and reaches a gear point F which is lower than the speed required to supply the thread 6. From the starting point S to the meshing point E , the thread tension initially falls, because a thread supply proceeds without the corresponding consumption. At the mesh point F, the yarn consumption jumps from zero to a maximum value. Meanwhile, the synchronous motor with disk rotor 14 is accelerated, preferably with its maximum possible acceleration, up to the expected speed of rotation, which is reached at time B. The expected speed of rotation is then somewhat lower than the speed of rotation. The following rotational speed is required for the supply of the thread 6. The setting of a lower speed of rotation is carried out for the purpose of preserving the thread tension rapidly, as far as possible, up to its predetermined value, during the acceleration phase of the synchronous motor with disk rotor 14 between the instants S and B. However, by anticipating supply of the yarn 6 between the initial instant S and the instant of engagement F, a value of the yarn tension is avoided. Simultaneous control of the yarn tension by the sensor device 22 acts to suppress the decrease in yarn tension caused by the excess supply of yarn.

However, the processor 16 and the regulating device 15 can also work as a control between the instants S and B, without taking into account the actual wire tension. However, when the synchronous motor with disk rotor 14 reaches its rotational speed at time B, the regulator switches to its regulating function and exactly adjusts the tension of the wire. The signal from the yarn tension sensor 22, which until now was, to some extent, masked, now leads to the processor 16 and the regulating device 15. The decrease in a certain value of the yarn tension before the start of the fabric does not lead to any detriment in the quality of the fabric, since the weaving process has not yet begun. On the contrary, due to the fact of avoiding the peaks of tension at the beginning of the process, the fabric is more uniform and then improves its quality. When the end of cycle T is reached, ie when the thread guide 7 is stopped at the far end of row 4 of thread supply device 1, the thread consumption ends abruptly. Due to the continuation of the movement (moment of inertia) of the synchronous motor with disk rotor 14, a certain amount of spinning is supplied, which leads to a decrease in the thread tension. As in these circumstances no mesh is woven, this is not harmful. With a new appearance of yarn consumption during the retraction R of the yarn guide 7, the yarn tension increases again. Because the yarn consumption in the recoil is reduced, the variation of the regulator that occurs can be absorbed without major problem, so that there is no overshoot of the yarn tension. As indicated in fig. 5 with 40 and small triangles, the wire tension in the phase between the end of the cycle T and the return R can also be recirculated by means of a backward rotation of the synchronous motor with rotor to disk 14. An effect similar, as with a short duration recoil, can be achieved with an anticipated stop of the synchronous motor with disk rotor 14. However, to prevent voltage peaks, the variant described above is preferable. Fig. 5 shows, in addition, the behavior of the yarn tension in the known yarn supplying devices, according to the current state of the art. The TI curve, represented by a cut line, reproduces the time behavior of the yarn tension in a known yarn supplying device by means of DE 36 27 731 Cl. This yarn supply device has a thread collector formed by an articulated lever with an eyelet at one of its ends. The thread runs through this eyelet forming an acute angle, so that through greater or lesser movements of the lever can be collected or yield a reserve of thread, the acceleration of the lever to yield r the reserve of wire produces voltage peaks 41, 42 that can cause the thread to break. Notorious tension peaks 43, 44 are produced even when elastic threads are used, as shown in fig. Til. When a yarn reserve is created between the yarn wheel and the knitting machine with a current yarn supplying device, which rests only on the elasticity of the highly elastic yarn employed and does not have movable mechanical elements, a The behavior of the wire tension according to the TV curve of FIG. 5. Immediately after the engagement point F, a peak of the yarn tension is produced, which is largely suppressed, despite the use of a hard yarn 6, in the yarn supplying device 1 according to fig. 1. A modification of the embodiment of the yarn supplying device 1 can be seen in fig. 2. Fn this is arranged in the flat knitting machine 2, instead of the sensor device 24, a sensor 51 which is connected to the additional input 19 of the processor 16. the additional input 19 is developed, in this embodiment, so that the difference that is formed from the signals in the inputs of the pre-set value 17 and of the actual value 18 can be incorporated, at least temporarily, a summing-up. effect when the predetermined value generated in the preset valuedler 21 is reduced a little during the distance of the yarn guide 7 from the yarn supplying device 1 and / or is increased a little during the approach of the yarn guide 7 of the provider device ?? of wire 1 (regulation circuit of disturbing magnitudes). This acts in the compensation of the different frictional forces that are generated in the two work phases that are established due to the different relationships of the yarn speeds, and produces, with an adequate sizing of the yarn tension increase, a identical yarn tension both on the way out and on the return. Therefore, the difference between the supply voltage and the return voltage, indicated in fig. 5 with D. A temporary limitation of the circuit of regulation of disturbing quantities can be used for the purpose of achieving an advance advance of the synchronous motor with rotor to disk 14, which, therefore, carries out an anticipated yarn delivery. A modified embodiment of the yarn supplying device 1, shown in FIG. 3, is carried out without engagement of the flat knitting machine 2 or sensors thereto. The yarn supplying device 1 is provided with a module 52, which investigates the time behavior of the yarn tension signal, which is yielded by the yarn tension sensor 7? . If repetitive structures appear during the course of this signal, the module 52 determines its period and issues an accurate prediction of the expected thread tension within a preset time period, under the assumption that the recognized periods are repeated again. After correlating the spikes or yarn tension decreases with the respective variations in yarn consumption, the module 52 generates a yarn consumption signal of the real yarn consumption, which can be used in place of the signals delivered by the device sensor 24 or sensor 51 (Fig. 1 and Fig. 2). In a refined embodiment, the output signal of the module 52 is superimposed on the predetermined value signal of the predetermined value generator 21, so that a profile of predetermined values is created. This is the opposite of the normal deviations that have occurred up to now, so that, in total, a constant wire tension is obtained by superposition. The processor 16 may contain, in addition to the module 52, a simulation model, by means of which the expected wire consumption is determined, which is taken into account in the other regulations. The simulation model is a reproduction of the normal route, including all its essential influence factors. Alternatively, the module 52 can also control characteristics of the regulation device 15, as indicated in FIG. 3 with a cut line, in order to achieve faster pulse stages - One of the most suitable supplies for each weaving stage is achieved with a yarn supplying device 1 which, as indicated in fig. 4, is coupled to a processing unit 54 existing in the knitting machine 2. This communicates with a memory of drawings 55, from whose data the current and future need for yarn can be calculated. The processing unit 54 is connected to sensors or elements of the machine, not shown in greater detail in the drawing, in order to record the current working position of the wire guide 7 and the needles 4, or, in other way , the work position is obtained directly from the position values of the machine control. In a special output 56 provided for this, the processing unit 54 delivers signals to the additional input 19, which is processed in the ways described above by the processor 16. They can be processed within the framework of a magnitude regulation circuit. disturbances, in an adaptive regulation or as an additional parameter, whereby the regulator then tries to adjust the supply of yarn in order to supply the sufficient quantity of yarn, to maintain the constant yarn tension, as well as to anticipate the future need Of thread. The result is a commitment that can be achieved, for example, because the processor 16 links the signal delivered by the yarn tension sensor 22 and / or the signal of the predetermined value generator 21 to the signal of the processing unit 54. For this, the regulator can be made up of way to process the incoming signals in the framework of a Fuzzy logic. Additionally, in each of the yarn supplying devices 1, a yarn collector can be provided, which is arranged between the yarn wheel 13 and the flat knitting machine 2. The yarn retriever can be formed as a yarn collector. lever or, in elastic yarns, as a stretch of travel, in which the thread can be stretched sufficiently. In order to supply, in particular, hard yarns, there is provided a yarn supplying device 1, developed especially for knitting machines 2 with a yarn consumption with variations that are strongly time-dependent. The yarn supplying device 1 has a yarn wheel 13 driven by a motor which, in the ideal case, supplies directly, without the intermediate incorporation of yarn gathering devices, to the knitting machine 2 or to the yarn guide 7. The yarn tension is controlled by means of a yarn tension sensor 22, which records the measured value for a yarn regulator 15, 16 to be supplied by the yarn wheel 13. The regulator 15, 16 is shaped in a manner that can process signals that contain information about future yarn consumption. In this way, the regulator 15, 16 can react in advance, by means of an early cession or a cessation of the cession, when sudden changes of need of thread appear, as they occur, for example, periodically in the edges of the fabric in weaving machines. flat point 2 (reversal points of the thread guide). So it is possible to control spikes and sharp drops of tension. For this, the regulator 15, 16 can be developed so that it can work as a status regulator or, temporarily, as a control. Other measures are also possible, such as circuits for regulating disturbing quantities, adapting parameters or the like.

Claims (22)

NOVELTY OF THE INVENTION CLAIMS

1 - . 1 - A yarn supply device for the supply of yarn to knitting machines and knitting machines with constant tension as far as possible, with variable consumption abruptly in time, in particular, flat knitting machines ( 2), with a wire wheel, which is arranged in the path of the thread so that it can be wrapped by it, and acting on the defined advance of the thread, with an electric drive device, which is coupled together with the wheel, with a sensor for recording the wire tension, by means of which a wire tension signal that characterizes the wire tension can be generated, with a regulator, by means of which the drive device can be controlled with the wire tension signal (real signal), for the wire supply with continuously constant voltage, characterized in that the regulator (15, 16) is shaped so that it can process, together with and / or instead of the wire tension signal, at least one other signal containing information about the need for future wire.

2- A yarn supplying device according to claim 1, characterized in that the information about the need for future yarn contains only data referring to the need for immediately preceding yarn.

3- A yarn supply device according to claim 1, characterized in that from the other signal a signal with a variable predetermined value is formed in time.

4- A yarn supply device according to claim 3, characterized in that, in front of the abrupt appearance of phases with high need for yarn, the predetermined value of the yarn tension is reduced for a short time.

5- A yarn supplying device according to claim 3, characterized in that, in front of the abrupt appearance of phases with no need for yarn, the predetermined value of the yarn tension is increased for a short time.

6- A yarn supply device according to claim 1, characterized in that the drive device (14) is started before the beginning of the need for yarn, and is stopped before the end of the need for yarn.

7- A yarn supply device according to claim 1, characterized in that the predetermined value of the yarn tension corresponds to a yarn tension profile that adapts to the need for yarn variable in time.

8- A yarn supply device according to claim 7, characterized in that the profile of predetermined values is a function of the speed of operation of the machine and / or other parameters of the machine. 9. A yarn supply device according to claim 1, characterized in that the profile of predetermined values is an always constant switchable value of the yarn tension between the return and the return of the yarn guide. 10. A wire supply device according to claim 1, characterized in that the supply required by the regulator (15, 16, 52, Fig. 3) is determined cali fi etely. 11- A yarn supply device according to claim 1, characterized in that a signal that deviates from the true yarn tension signal, which was derived by means of the previous course of tension, is used as a yarn tension signal. Of thread. 12- A yarn supply device according to claim 1, characterized in that starting and stopping points of the drive device (14) are prefixed with elements (9) of the knitting machine. 13- A yarn supply device according to claim 1, characterized in that the regulation characteristic of the regulator (14, 15, 52, Fig. 2) is qualified and / or continuously adapted to the current operating conditions of the knitting machine (2). 14- A yarn supply device according to claim 1, characterized in that the required amount of yarn is determined by means of data that are stored in a pattern memory (55) for the control of the knitting machine (2). 15- A yarn supply device according to claim 1, characterized in that the yarn tension sensor (22) is essentially formed as a free path, so that a sensor element (23) put in contact with the yarn ( 6) present a reduced measuring ca rere. 16- A yarn supply device according to claim 15, characterized in that the path of the yarn between the yarn wheel (13) and the knitting machine (2) is determined by inelastic elements (27, 28), except the sensor element. 17- A yarn supply device according to claim 1, characterized in that between the yarn wheel (13) and the knitting machine (2) is provided a yarn collector, which is constituted by a sector of travel located between the wire wheel (13) and the weaving place, in which the elastic thread is guided in freely elongated form. 18. A wire supply device according to claim 1, characterized in that the drive device (14) is a synchronous motor. 19. A wire supply device according to claim 1, characterized in that the drive device (14) is a motor with disk rotor. 20- A yarn supply device according to claim 1, characterized in that the drive device (14) and the regulator (15, 16) are developed so that the drive device (14) can be operated in two directions of turn. 21. A wire supply device according to claim 10, characterized in that a filter (20) is arranged between the voltage sensor (22) and the regulator (15, 16) coupled to it. 22- A wire supply device according to claim 21, catered because the filter (20) blocks the disturbing frequency ranges.