EP0853695B1 - Electronically controlled thread feed - Google Patents

Electronically controlled thread feed Download PDF

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Publication number
EP0853695B1
EP0853695B1 EP19960934424 EP96934424A EP0853695B1 EP 0853695 B1 EP0853695 B1 EP 0853695B1 EP 19960934424 EP19960934424 EP 19960934424 EP 96934424 A EP96934424 A EP 96934424A EP 0853695 B1 EP0853695 B1 EP 0853695B1
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EP
European Patent Office
Prior art keywords
thread
characterised
feed according
tension
thread feed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19960934424
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German (de)
French (fr)
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EP0853695A1 (en
Inventor
Josef Fecker
Ludwig Ketterer
Eberhard Leins
Hermann Schmodde
Friedrich Weber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Memminger IRO GmbH
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Memminger IRO GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE1995137325 priority Critical patent/DE19537325C1/en
Priority to DE19537325 priority
Application filed by Memminger IRO GmbH filed Critical Memminger IRO GmbH
Priority to PCT/DE1996/001751 priority patent/WO1997013906A1/en
Publication of EP0853695A1 publication Critical patent/EP0853695A1/en
Application granted granted Critical
Publication of EP0853695B1 publication Critical patent/EP0853695B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04BKNITTING
    • D04B15/00Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/38Devices for supplying, feeding, or guiding threads to needles
    • D04B15/48Thread-feeding devices

Description

The invention relates to a thread delivery device with the features of the preamble of the claim 1, especially for the supply of elastic and non-elastic (hard) threads, tapes, strands and the like.

Thread delivery devices have in knitting and knitting machines the task of matching the appropriate knitting points each time the right time with the required Supply voltage and in the desired amount. The The constancy of the thread tension essentially determines the Uniformity of the knitted fabric obtained. Fluctuations the tension of the fed thread, in particular if they systematically stitch stitch by stitch recurring, to a significant impairment the quality of the knitted fabric. Thread tension fluctuations can temporally abruptly changing thread requirements occur. This is for example in the case of flat knitting machines when the direction is reversed of the thread guide for a short time no thread consumption is present. If the thread tension fluctuates here, there are others at the edges of the knitted fabric Mesh sizes than in the middle.

The thread tension is particularly dependent on hard yarns because of the lack of elasticity of the thread from the thread delivery quantity, which corresponds to the respective current If possible, match the time with the thread consumption should.

For applications with fluctuating thread consumption is the yarn delivery device known from DE 36 27 731 C1 developed one by one Has stepper motor driven thread wheel. This leads the over a thread brake from a thread spool pulled thread to the relevant knitting points. The thread delivered by the thread wheel runs through a end eyelet of another end pivotally mounted Lever. The eyelet represents a deflection point at which the Thread is diverted at an acute angle. For setting The swivel lever is a constant thread tension by means of a DC motor with a constant Torque applied. In addition, the swivel lever connected to a position transmitter, the Detected swivel position and the stepper motor accordingly readjusted. The swivel lever serves in cooperation with the sensor device for detecting the existing thread tension.

A controller compares the position of the swivel lever with a setpoint and accelerates or decelerates the Motor if the setpoint is exceeded or not reached. To compensate for sudden changes in demand, which the motor due to its moment of inertia the swivel jack cannot follow immediately a thread store that has a limited thread length can cache.

In the event of sudden changes in the thread requirement, the Swivel levers are accelerated. The moment of inertia the swivel lever acts on the thread tension back and affects their constancy.

DE 38 20 618 C2 describes a thread delivery device known for crimp and other fancy yarns that two counter-rotating, twist-driven yarn wheels has to the yarn to be delivered several times is looped in eight. As thread storage for temporary storage temporarily not from the knitting points removed yarn serves an end carrying an eyelet Arm that applies torque in a predetermined direction of rotation is. The yarn runs at an acute angle through its end eyelet and becomes a temporary storage on bolts arranged along a circumference of the arm or post.

On the bolt or a buffer Post and on the eyelet of the Poor friction effects affect the yarn flow on.

DE 42 06 607 A1 describes a thread delivery device for simultaneous feeding of two threads to a knitting machine known in which a thread delivery wheel of one Disk motor is driven. At least one Thread runs from the thread delivery wheel through the longitudinal opening a conical or trumpet-shaped coil spring. At one end the coil spring can be pivoted holding bearings are a permanent magnet and a Hall sensor provided to deflect the coil spring to be able to record. Based on this, the disc rotor motor readjusted so that in stationary condition stood the target position of the coil spring. In this runs the thread laterally on the inner wall of the Coil spring attached through its opening. The coil spring serves as a spring and damping element, the one certain intermediate storage of delivered thread allowed.

Due to the moment of inertia of the disc motor The delivered thread will change the thread tension recorded by the buffer.

WO 90/09625 describes a weaving machine for multi-color weaving known, the so-called for different threads Has storage facilities. The storage operators each have a storage drum, if possible is continuously supplied with thread to it to fill. The weaving machine pulls according to its current Consumption thread from the storage drum. The machine control now only has to ensure that for the planned pattern sufficient thread on the storage drum is available. Accordingly, the storage drum becomes the middle one Thread consumption filled accordingly. The storage drum accordingly with a low constant Speed operated. This is with feeders for elastic threads not practical.

From DE-A-1585166 is a thread delivery device known for circular knitting machines, where a thread delivery wheel from a stepper motor in sync with the knitting machine is driven. To do this is the needle cylinder of the knitting machine connected to an alternator that drives the synchronous motor. The stepper motor can be controlled by program Change the thread feed, e.g. through the chain shifting device or a jacquard device to be controlled.

A detection or regulation of the thread tension does not occur, so that the thread tension corresponds to the delivery and consumption ratios accordingly uncontrolled sets.

Finally, from US-PS 38 58 416 is a thread delivery device known for knitting machines with im substantially constant thread consumption and for feeding of hard yarn is provided. The thread delivery device shows one in its speed over the applied voltage controllable electric motor, which by means of a appropriate thread wheel pulls yarn from a bobbin and a thread tension sensor of the respective Feeds knitting site. There is also a setpoint generator available, which can be switched on and off via a switch Adjustment devices with a setpoint input a controller is connected. This receives via the Switches a signal characterizing the thread tension to its actual value input and controls the motor accordingly to. In addition, the electric motor and the Knitting machine speed sensors available at a corresponding other switch position of the switch connected to the setpoint and actual value input of the controller can be. The switch allows the Switching from an operating mode with a constant regulated Thread tension in an operating mode with a defined thread delivery quantity. Every knitting point on the circular knitting machine a corresponding thread delivery device is assigned, so that the amount of thread to be supplied is only the thread consumption corresponds to a knitting point. The thread speed is accordingly low.

Measures to cache any existing excess, due to inertia or -characteristic delivered or suddenly to deliver required thread lengths have not been met. Suddenly therefore occurring changes in the thread requirement generate because of the response time of the controller and the connected one Motor thread tension peaks, which in extreme cases lead to Thread break can lead.

Based on this, it is an object of the invention to create a thread delivery device, by means of which Knitting yarns at high speeds that can change abruptly, avoiding voltage peaks can be fed with a desired thread tension are.

This task is done with a thread delivery device solved with the features of claim 1.

The thread delivery device is a feeder educated. This has an electric motor driven thread wheel, which is arranged in the thread path and wrapped around it several times. The Electric motor, preferably a disc rotor stepper motor, is controlled by a control device that adjusts to constant thread tension. To capture the Thread tension is a connected to the control device Voltage sensor provided, which is preferably a has a small measuring path. This is in the millimeter range. This ensures that the measurement of the thread tension essentially non-reactive and with high Dynamics can be made. The thread tension sensor thus does not form a thread store.

The control device is designed such that it in addition to the isc value of the thread tension and the setpoint for the thread tension can process further information, which is related to future thread needs. In order to it is possible to time before the sudden occurrence a peak demand the drive motor of the thread delivery wheel to accelerate and thread in advance, so to speak deliver. The following peak demand consumes this pre-delivered thread supply while the drive motor accelerated further to its required speed. On this way becomes the one desired for the knitting process Thread tension without the occurrence of dangerously high thread tensions reached. The risk of thread breakage or breakage can this way can be significantly reduced and at the same time is considering the quality of the knitted fabric increased to the uniformity of the mesh size.

For the generation and processing of the signal that Contains information about future thread requirements, there are several options. The signal can, for example difference between the setpoint generated in the controller input and actual value of the thread tension are applied. The Depending on the sign, the connection can be added or Subtraction from the difference generated or by other operations are performed. Another possibility lies in the signal before the difference is formed of setpoint and actual value either with the setpoint or with to link the actual value. In all cases it is achieved that at the input of the actual controller a size pending, which consists of the setpoint, actual value and the additional Signal is generated.

In simple cases, the information may suffice about the future thread requirement only on the immediate to limit upcoming thread requirements. To can the thread tension for a fixed time and / or range of travel can be predetermined.

Another variant is the temporary Suppression of the thread tension signal and the control the drive device based on the additional signal. The controller then temporarily works as a controller.

The additional signal can be in a simple Variant be a signal that only provides information about the contains imminent thread requirements. Such can be achieved with a binary signal that is in a fixed time interval before the occurrence of Thread requirement changes its value. Based on this signal the drive motor for the thread wheel can start prematurely or be stopped.

The combination of the binary signal or another Signals that provide information about the future Includes thread requirement, both with the setpoint as also with the actual value. In all cases, a Excessive thread tension (thread tension peak) and excessive weakening of the thread tension (thread tension drop) prevented.

To compensate for the required response time of the Motor due to its moment of inertia and as a result its otherwise limited maximum acceleration can the control device from the outset instead of one constant setpoint for the thread tension a setpoint profile can be specified, which corresponds to the expected Control deviations from the desired thread tension overlaid. In the simplest case it will Setpoint profile formed by a thread tension setpoint, that of flat knitting machines for the back and forth Return of the thread guide assumes different values. The setpoint profile can depend on the machine running speed be dependent so that voltage peaks and voltage drops even at different machine speeds be largely suppressed.

In a modified embodiment, the Regulator learning the required thread delivery. To for this purpose, it saves the detected thread tension, for example from. In a next cycle, the start of a signal provided by the knitting machine is displayed can be the thread delivery from the outset set that voltage peaks present in the previous cycle now reduced or not generated. This approach is particularly suitable for knitting machines on those unpatterned goods or goods with simple, yourself repeating patterns.

The controller can supply the required amount of thread also based on other parameters, such as based on the learn the impulses delivered by the drive motor.

In addition, it is possible to control the characteristic learning to determine the controller and working conditions to adapt. The above Solutions are suitable for thread delivery devices, too can be retrofitted to knitting machines, without major interventions on the knitting machines would be required. With one also for complicated ones The controller is a suitable solution for thread delivery conditions the thread delivery device to the on the knitting machine existing sample memory connected. From the to knitting patterns will be current and future required thread delivery quantity determined and the controller as additional information about the thread tension is supplied. Future demand peaks or sudden future ones Anticipating no need, the controller can moment of inertia and the Accelerate or decelerate the thread wheel in time.

If the thread path between the thread wheel and the Knitting machine is unsprung, can at hard threads thread storage effects and inertia influences be reduced, which otherwise affect the controller would. It is therefore also advantageous if the Measuring path of the thread tension sensor is very small and is preferably in the range of about one millimeter. The thread tension is thus essentially measured without influencing them, that is, without retroactive effects.

For buffering thread lengths, the one A thread store can represent temporary control deviations be provided. When using the thread delivery device for elastic yarns there can be a section between the thread wheel and the knitting machine as thread storage be trained. Due to the elasticity of the Fadens has a certain buffer effect.

High drive dynamics are achieved if the Drive device is designed as a stepper motor. Disc rotor motors and in particular disc rotor stepper motors enable a fast start-up and rapid braking of the thread wheel.

Between the thread tension sensor and the connected one A filter can be provided for the controller Suppresses interference. This can be done by blocking interference frequency ranges respectively. In addition, the voltage sensor with compensation means to suppress Interference signals should be provided.

Exemplary embodiments of the invention are shown in the drawing. Show it:

Fig. 1
a schematic representation of a flat knitting machine with a thread delivery device, which is guided by a controller on the basis of the thread tension and on the basis of a further signal which is emitted by a direction-sensing sensor device which is provided for monitoring a machine element on the knitting machine,
Fig. 2
1 in a schematic representation, a flat knitting machine with a thread delivery device according to FIG. 1 and a modified regulator which is guided by the thread tension and a state of movement of a machine element of the flat knitting machine,
Fig. 3
a knitting machine with a thread delivery device, which is controlled by a learning controller, in a schematic representation,
Fig. 4
a flat knitting machine with a thread delivery device, the controller monitors the thread tension and receives additional information about the current and future amount of thread from a sample memory of the flat knitting machine, in a schematic representation; and
Fig. 5
the time course of the thread tension during the forward and return stroke of the thread guide of a flat knitting machine in the thread delivery device according to FIG. 1 in comparison to the time profile of the thread tension with different thread delivery devices and yarns known from the prior art.

In Fig. 1 is one with a thread delivery device 1 provided flat knitting machine 2 shown schematically. The flat knitting machine 2 has at least one Row 4 of latch needles 5 arranged in a line on, in the machine cycle like a continuous Shaft driven out and drawn in. The feeder a hard, i.e. inelastic thread 6 to the needles 5 serves a thread guide 7 which in the direction of arrow 8 is driven back and forth. To drive the thread guide 7 serves a carriage 9 which runs along the row 4 runs back and forth. The carriage 9 leaves during of its run the thread guide 7 at the end of row 4 stand, reverses its direction of movement and then takes the thread guide again. This takes place in both directions of movement and reversal points.

For conveying and delivering the thread 6 to the thread guide 7, the thread delivery device 1 has a thread wheel 13 with a low moment of inertia, which in the Thread path is arranged and a few of the thread 6 Times is entwined. The thread wheel 13 is by, for example. six extending radially from a hub Wire bracket formed. These point in the axial Direction aligned thread support sections on the corners of a regular hexagon are arranged. The hub of the thread wheel 13 is one with the rotor Disc rotor stepper motor 14 firmly connected by a control device 15 is controlled and a Low inertia drive device forms.

The control device 15 is designed so that the disc rotor stepper motor 14 fully if necessary can accelerate, but it certainly will stops in safe operating areas so that the disc rotor stepper motor 14 do not fall out of step and can undesirably stop.

The control device 15 is a processor 16 for Determination of the control deviation upstream of both as analog as well as digital or computer circuit can be trained. The processor 16 has one Setpoint input 17, an actual value input 18 and one Additional input 19 on. The actual value input 18 can, if necessary be provided with a filter 20 that the screening of interference frequencies and as a band filter, Band stop, high or low pass is formed.

The setpoint input 17 is to a setpoint generator 21 connected, which has a fixed value for the Thread tension of the thread 6 specifies. The actual value input 18 is suspended from a low-vibration and dampened Thread tension sensor 22 connected to the thread tension scanned via a sensing element 23. The additional entrance 19 is attached to a provided on the flat knitting machine 2, direction-dependent sensor device 24 connected, the movement by means of a light barrier of the carriage 9 in particular in the reversal area. The sensor device 24 emits a signal when the carriage 9 a predetermined area in the direction arrow 25, i.e. towards the thread guide 7, passes through. This signal is used by processor 16 as an additional Criterion for controlling the control device 15 used. In addition, the sensor device generates 24 a the speed of the passing carriage 9 characterizing signal and delivers this to the processor 16. If necessary, on the opposite Page at the corresponding reversal point Sensor device for detecting the carriage movement be provided, which are also connected to the processor 16 is.

The processor 16 forms for determining the to Control device 15 the control deviation to be sent Difference between those at the setpoint input 17 and signals present at the actual value input 18. In the stationary State of the controller, this difference forms the control deviation. The additional input 19 now serves one To pretend control deviation to a certain extent, although the Thread tension of the thread 6 has its intended value or within a specified tolerance range lies. Thus, as can be seen from the following functional description results, the thread delivery device 1 a future sudden change in thread consumption anticipate. The sensor device 24 delivers a signal that provides information about the upcoming Includes thread consumption. It does this by passing it of the carriage 9 in the direction of the thread guide 8 too registered and reports. The thread consumption increases shortly after this message, when the carriage 9 on the Thread guide 7 strikes and this abruptly in the predetermined Accelerated direction, jumped from zero to zero an approximately constant value. The signal from the sensor device 24 now indicates that this event is immediate is imminent.

The thread delivery adapted in this way can also with hard yarns, there is no need to store thread and the The entire thread path can pass through to the sensing element 23 rigidly mounted elements 27, 28 and others not shown elements can be defined.

The thread delivery device 1 described so far operates as follows:
As long as the sensor device 24 does not emit a signal, the processor 16 supplies at its output the control deviation which corresponds to the difference between the thread tension determined by the thread tension sensor 22 and the target value supplied by the target value generator 21. The control deviation is implemented by the control device according to the P, PI or PID characteristic and is supplied by a control circuit contained in the control device 15 as a pulse train to the disc rotor stepper motor 14. The controller can be designed both as a continuous and as a discontinuous controller. By means of the thread wheel 13, this just conveys the amount of yarn that is required to maintain the desired thread tension and to minimize the control deviation or to make it zero. Gradual and / or minor changes in thread consumption are detected and corrected using the thread tension.

A sudden increase in thread consumption from However, zero to the maximum value is imminent if the Carriage 9 on the sensor device 24 in the direction of Arrow 25 passes. The time period depends on the occurrence of the sensor device 24 generated signals and the sudden change in Thread consumption from the distance of the switching point Sensor device 24 of the thread guide 7 and the speed of the carriage 9. The processor 16 therefore starts the disc rotor stepper motor 14, as soon as or shortly after receiving the signal from the sensor device 24 receives, and leaves the disc rotor stepper motor 14 start up at such a speed, that the thread tension first drops and in the Area between the thread wheel 13 and the thread guide 7 a certain thread reserve is present which is an occurrence prevents excessive thread tension.

This process is shown in detail in FIG. 5. The curve I marked with small circles indicates the course of the thread tension over the Time. During the carriage 9 the thread guide 7 to one Engagement time E hits, the disc rotor stepper motor 14 based on the signal of the sensor device 24 started earlier, at a starting time S. It initially runs according to a specified profile slowly on and reaches one at the time of intervention E. Speed that is lower than that for delivery of the Fadens 6 required speed. From the start time S up to the point of engagement E, the thread tension drops therefore first off, because thread delivery is already taking place, without corresponding consumption would.

At the time of engagement E, the thread consumption jumps from zero to its maximum value. In the meantime, the disc rotor stepper motor 14 is accelerated with preferably maximum possible acceleration to its expected target speed, which is reached at a point in time B. The target speed is slightly below the speed that is subsequently required to deliver the thread 6. The target speed is set at a lower level in order to allow the thread tension to rise as quickly as possible to the desired value between times S and B during the acceleration phase of the disc rotor stepper motor 14. By pre-delivering the thread 6 between the start time S and the engagement time E, however, an excessive increase in the thread tension beyond the desired value is avoided. The simultaneous monitoring of the thread tension by the thread tension sensor 22 serves to prevent the thread tension from falling due to excessive thread delivery.

However, the processor 16 and controller can 15 between times S and B also as a control regardless of the real thread tension work. If the disc rotor stepper motor 14 to the When time B reaches its target speed, the controller goes however in its regular operation and puts the desired one Thread tension exactly. So far, so to speak hidden signal of the thread tension sensor 22 now guides the processor and the control device 15.

The thread tension drops before the knitting begins a certain low value leads to no impairment the quality of the knitted fabric, because the knitting process has not started yet. On the contrary, through the Avoiding a voltage spike at the start of knitting the knitted fabric more evenly and therefore in its quality improved.

When the clock end T is reached, i.e. if the thread guide 7.an.dem remote from the thread delivery device 1 When the end of row 4 stops, the thread consumption ends abruptly. By leakage (moment of inertia) the disc rotor stepper motor 14 is still a certain Amount of yarn delivered, leading to a certain decrease the thread tension leads. Because in this state however, no stitches are knitted, this is harmless. If thread consumption occurs again when returning R of the thread guide 7 builds the thread tension immediately back on. After the thread consumption in the return is relatively small, the change that occurs is from that Can easily cope with controller so that no overshoot the thread tension occurs.

As indicated in Fig. 5 at 40 with small triangles is, the thread tension in the phase between the Clock end T and the return R also by reverse rotation of the disc rotor motor 14 are rebuilt. On similar effect as with a short rewind by prematurely stopping the disc rotor stepper motor 14 reachable. To avoid voltage peaks However, this is the variant described above preferable.

Fig. 5 also shows the course of the thread tension in yarn delivery devices known from the prior art. The curve shown in dashed lines II gives the course of the thread tension over time a thread delivery device again, as it is from DE 36 27 731 C1 is known This thread delivery device has a thread store, which is pivoted by a Lever is formed with an end eyelet. The string runs through this eyelet at an acute angle, so that through more or less large pivoting of the lever one Thread reserve can be added or given. The Acceleration of the lever when the thread reserve is released causes tension peaks 41, 42 that lead to thread breakage being able to lead. Even when using elastic threads occur, as curve III shows, significant voltage peaks 43, 44 on.

Is with a thread delivery device with conventional Regulation of a thread reserve between the thread wheel and the knitting machine built up without mechanically moving elements solely on the inherent elasticity of a highly elastic used Yarn based, a thread tension course reached according to the curve labeled IV in FIG. 5 become. Immediately following the time of intervention E. there is an increase in thread tension, which in the Thread delivery device 1 according to FIG. 1 despite use a hard thread 6 is largely suppressed.

A modified embodiment of the thread delivery device 1 can be seen from FIG. 2. With this one instead of the sensor device 24 on the flat knitting machine 2, a sensor 51 is arranged which is connected to the additional input 19 of the processor 16 is connected. The additional entrance 19 is designed in this embodiment so that about this to the difference resulting from the signals the setpoint input 18 and the actual value input 17 a summand has been added, at least temporarily can be. The same effect is achieved when the setpoint generated by the setpoint generator 21 at movement moving away from the thread delivery device 1 of the thread guide 7 slightly lowered and / or when it runs Movement is slightly increased (feedforward control). This serves to balance different ones Frictional forces that arise in both work phases different thread speed ratios adjust, and with the correct dimensioning causes the An identical thread tension when and on return. This also disappears in FIG. 5 D is the difference between the supply and return voltage.

A time limit for the feedforward control can be used to start the disc rotor stepper motor early 14 to bring about that pre-delivers yarn.

A modified embodiment shown in Fig. 3 the thread delivery device 1 comes without intervention into the flat knitting machine 2 or sensors this one out. The thread delivery device 1 is with a Module 52 provided the time course of the thread tension signal investigated by the thread tension sensor 22 is delivered. Occur over time this signal repetitive structures determined module 52 the period and arrives on the assumption that recognized periods will repeat, one Prediction of the expected thread tension within a predefined period of time. After occurring Voltage peaks or drops with corresponding Changes in thread consumption are correlated, module 52 generates the actual thread consumption leading thread consumption signal, which instead of the sensor device 24 or the sensor 51 (FIGS. 1 and 2) emitted signals can be used.

Overlaid in a more refined embodiment the output signal of the module 52 the setpoint signal of the Setpoint generator 21 so that a setpoint profile is created. This is opposite to those that have occurred so far Control deviations, so that overall by overlay a constant thread tension is obtained.

Instead of the module 52, the processor 16 can also contain a simulation model, based on which the expected thread consumption determined and for the further Regulation is taken into account. The simulation model is a replica of the controlled system with everyone essential influencing factors.

Alternatively, as in Fig. 3 by a dashed Connection 53 is indicated, the module 52 also has characteristics control the control device 15 so that faster settling processes can be achieved.

One that is customized for each knitting process Yarn delivery is with a yarn delivery device 1 reached, which, as indicated in Fig. 4, to an in the processing unit 54 of the knitting machine 2 connected. This communicates with a sample memory 55, from whose data the current and can calculate future yarn needs. Either it stands Processing unit 54 via not shown Sensors connected to machine elements so that they the current working position of the thread guide 7 and Needles 4 detected, or the working position results directly from position values of the machine control. On a separate, intended exit 56 gives the Processing unit 54 signals at additional input 19 starting from the processor 16 in one of the above described ways are processed. You can both as part of a feedforward control, one adaptive control or processed as an additional parameter the controller then tries to change the Set the thread delivery so that both the thread tension constant as well as upcoming thread needs anticipating that sufficient thread is supplied. The The result is a compromise, which is achieved, for example may be that the processor 16 that from the thread tension sensor 22 delivered signal and / or the signal of Setpoint generator 21 with the signal of the processing unit 54 linked. The controller can be designed in this way be that he has the pending signals in the frame fuzzy logic.

In addition, each of the thread delivery devices described can 1 a thread store can be provided, the between the thread wheel 13 and the flat knitting machine 2 is arranged. The thread store can act as a lever store or designed as a distance in the case of elastic yarns be within which the thread can spring sufficiently.

For the supply of hard yarns in particular a thread delivery device 1 has been provided, in particular for knitting machines 2 with strong timing fluctuating thread requirement is designed. The thread delivery device 1 has a motor-driven thread wheel 13, ideally without the interposition of thread storage devices directly to the knitting machine 2 or the thread guide 7 delivers. The thread tension will by means of a thread tension sensor 22 which monitors the Measured value acquisition for the delivery through the thread wheel 13 controlling controller 15, 16 forms. The controller 15, 16 is also designed to process signals can, the information about the future thread needs contain. This allows the controller 15, 16 in advance of upcoming drastic changes in needs, like them For example, in flat knitting machines 2 periodically on the knitted edges (Reversal points of the thread guide) occur react by advance delivery or stop of thread delivery. Thread tension peaks and excessively steep thread tension drops can thus be corrected. The regulator 15, 16 can be designed so that it as a state controller and temporarily works as a controller. Other Measures such as feedforward control, parameter adaptation or similar are possible.

Claims (23)

  1. Thread feed for feeding a thread (6) to hosiery and knitting machines (2) at as constant a tension as possible in the case of sudden fluctuations in thread consumption,
    with a thread wheel (13), which is arranged in the path of the yarn in such a manner that it is looped by the thread (6) and which serves to transport the thread (6) in a defined manner in accordance with the current thread consumption,
    with an electric drive means (14), which is fixedly coupled to the thread wheel (13),
    with a sensor (22) for detection of the thread tension, by means of which a thread tension signal may be generated for identification of the thread tension,
    with a control means (15, 16), by means of which the drive means (14) may be actuated on the basis of the thread tension signal (actual signal) to feed the thread (6) at substantially constant tension,
    characterised in that
    said control means (15, 16) is configured such that it can process at least one further signal containing the information concerning the future thread requirement either in addition to and/or temporarily instead of the thread tension signal.
  2. Thread feed according to Claim 1, characterised in that the information concerning the future thread requirement only includes details of the directly imminent thread requirement.
  3. Thread feed according to Claim 1, characterised in that a time-variable set value signal is formed from the further signal.
  4. Thread feed according to Claim 3, characterised in that before the abrupt onset of phases of high thread requirement the set value for the thread tension is briefly reduced.
  5. Thread feed according to Claim 3, characterised in that before the abrupt onset of phases of lacking thread requirement the set value for the thread tension is briefly increased.
  6. Thread feed according to Claim 1, characterised in that the drive means (14) is started temporally before onset of the thread requirement and is stopped before the end of the thread requirement.
  7. Thread feed according to Claim 1, characterised in that the set value for the thread tension corresponds to a set value profile, which is adapted to the temporally fluctuating thread requirement.
  8. Thread feed according to Claim 7, characterised in that the set value profile is dependent on the machine running speed and/or other machine parameters.
  9. Thread feed according to Claim 1, characterised in that the set value profile is a respectively constant value for the thread tension which may be switched over between forward and return movement of the thread guide in the case of flat knitting machines.
  10. Thread feed according to Claim 1, characterised in that the required thread feed is determined by the control means(15, 16, 52, Figure 3) in a learned manner.
  11. Thread feed according to Claim 1, characterised in that a signal differing from the actual thread tension, which has been changed on the basis of the course of the thread tension covered, is used as thread tension signal.
  12. Thread feed according to Claim 1, characterised in that points of time for starting and/or stopping the drive means (14) are preset by machine elements (9) of the knitting machine.
  13. Thread feed according to Claim 1, characterised in that the control characteristic of the control means (14, 15, 52, Figure 2) is determined in a learned manner and/or is adapted continuously to the current operating status of the knitting machine (2).
  14. Thread feed according to Claim 1, characterised in that the required thread feed quantity is determined on the basis of data which are filed in a pattern memory (55) for controlling the knitting machine (2).
  15. Thread feed according to Claim 1, characterised in that the thread tension sensor (22) is configured to be essentially without a measurement path so that a sensing element (23) touching the thread (6) has a low measurement stroke.
  16. Thread feed according to Claim 15, characterised in that the thread path between the thread wheel (13) and the knitting machine (2) and onto the sensing element (23) is determined by elements (27, 28) disposed in an unsprung arrangement.
  17. Thread feed according to Claim 1, characterised in that a thread storage means formed by a path section between the thread feed wheel (13) and the knitting point in which elastic thread (6) is guided in a freely stretchable manner is provided between the thread wheel (13) and the knitting machine (2).
  18. Thread feed according to Claim 1, characterised in that the drive means (14) is a stepping motor.
  19. Thread feed according to Claim 1, characterised in that the drive means (14) is a disc armature motor.
  20. Thread feed according to Claim 1, characterised in that the drive means (14) and the control means (15, 16) are configured such that the drive means (14) may be operated in two directions of rotation.
  21. Thread feed according to Claim 10, characterised in that a filter (20) is arranged between the tension sensor (22) and the control means (15, 16) connected to this.
  22. Thread feed according to Claim 21, characterised in that the filter (20) blocks noise frequency ranges.
  23. Use of the thread feed according to one of the preceding claims on a flat knitting machine.
EP19960934424 1995-10-06 1996-09-17 Electronically controlled thread feed Expired - Lifetime EP0853695B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE1995137325 DE19537325C1 (en) 1995-10-06 1995-10-06 Yarn feed tension control on flat bed knitting machine
DE19537325 1995-10-06
PCT/DE1996/001751 WO1997013906A1 (en) 1995-10-06 1996-09-17 Electronically controlled thread feed

Publications (2)

Publication Number Publication Date
EP0853695A1 EP0853695A1 (en) 1998-07-22
EP0853695B1 true EP0853695B1 (en) 2001-07-25

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EP19960934424 Expired - Lifetime EP0853695B1 (en) 1995-10-06 1996-09-17 Electronically controlled thread feed

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US (1) US6010052A (en)
EP (1) EP0853695B1 (en)
JP (1) JPH11500500A (en)
KR (1) KR100275240B1 (en)
CN (1) CN1079856C (en)
AR (1) AR003797A1 (en)
AU (1) AU7278796A (en)
BR (1) BR9610841A (en)
CA (1) CA2233990C (en)
CO (1) CO4520141A1 (en)
CZ (1) CZ287733B6 (en)
DE (1) DE19537325C1 (en)
EA (1) EA000754B1 (en)
ES (1) ES2159046T3 (en)
GR (1) GR3036527T3 (en)
HK (1) HK1015834A1 (en)
IL (1) IL123954A (en)
IN (1) IN187802B (en)
TR (1) TR199800625T2 (en)
TW (1) TW353685B (en)
WO (1) WO1997013906A1 (en)

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EP1674600A4 (en) * 2003-10-17 2009-11-25 Shima Seiki Mfg Yarn feeding device of weft knitting machine
EP1837427A1 (en) * 2004-12-16 2007-09-26 Shima Seiki Mfg., Ltd Yarn feeder of weft knitting machine
EP1837427A4 (en) * 2004-12-16 2009-11-25 Shima Seiki Mfg Yarn feeder of weft knitting machine

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KR100275240B1 (en) 2000-12-15
CN1079856C (en) 2002-02-27
JPH11500500A (en) 1999-01-12
KR19990064040A (en) 1999-07-26
US6010052A (en) 2000-01-04
WO1997013906A1 (en) 1997-04-17
CO4520141A1 (en) 1997-10-15
CZ102298A3 (en) 1998-10-14
EA000754B1 (en) 2000-04-24
GR3036527T3 (en) 2001-12-31
TW353685B (en) 1999-03-01
CA2233990C (en) 2002-04-09
BR9610841A (en) 1999-07-13
CA2233990A1 (en) 1997-04-17
ES2159046T3 (en) 2001-09-16
CZ287733B6 (en) 2001-01-17
TR199800625T2 (en) 1998-07-21
EP0853695A1 (en) 1998-07-22
AR003797A1 (en) 1998-09-09
IN187802B (en) 2002-06-29
HK1015834A1 (en) 2002-10-18
DE19537325C1 (en) 1996-11-28
IL123954A (en) 2003-05-29
AU7278796A (en) 1997-04-30
EA199800270A1 (en) 1998-10-29
CN1202939A (en) 1998-12-23

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