EP1208055B1 - Method for controlling a yarn processing system and a yarn processing system - Google Patents

Abstract

The invention relates to a method for controlling a yarn processing system comprising a textile machine, a yarn feed device and a supply spool. According to the inventive method, the yarn feed device pulls the yarn from the supply spool with varying speed and forms and maintains a yarn intermediate supply. In addition, a rotatable supply spool (B) is turned at least by the yarn tension elicited by the winding drive (4) of the yarn feed device (F), and the yarn (Y) is tangentially removed from the supply spool (B).

Description

The invention relates to a method for controlling a thread processing system according to the preamble of claim 1 and a thread processing system according to Preamble of claim 10. "Thread" here does not only include conventional textiles or synthetic thread material, but primarily an elongated very tensile substrate, such as a tensile carbon or aramid fiber, a metal wire or the like

In the production of functional reinforcement fabrics, very tensile and possibly heavy-duty thread material processed. Also for paper and cardboard machines The filter or molded fabric used becomes a very tensile thread material processed. In the usual handling of such thread materials between the Supply spool and the thread delivery device with overhead thread take-off from the supply spool there are significant problems.

A method for controlling a thread processing system known from EP-A-863 236 omits the thread take-up resistance of the rotatable supply spool Consideration. The thread is only between the supply spool and the thread delivery device a pulley and guided by a braking device. The winding drive generates the thread tension for rotating the supply spool. With strong acceleration of the winding drive of the thread delivery device increases because the rotational resistance of the Supply spool and its inertia behavior are not taken into account, the thread tension strong. With a strong delay of the thread delivery device, however, runs the supply reel due to inertia, so that the thread tension if necessary completely collapses. From the strong increase in thread tension or Breakdown of the thread tension can result in malfunctions.

From FR-A-26 90 919 it is known to have several in parallel on a common Shaft arranged bobbins to regulate withdrawn warp threads in their thread tension.

Further prior art is contained in EP-A-396 902.

The invention has for its object a method of the type mentioned and to specify a thread processing system with which in particular tensile and extraordinarily strong thread material is easy to process.

The object is achieved with the features of claims 1 and solved the features of claim 10.

The rotational resistance of the supply spool to be overcome via the thread is actively controlled. This is an essential one Process feature and takes into account the fact that the winding drive must be accelerated relatively quickly to a high speed and thereby dragging the supply spool with it or bringing it to a standstill relatively quickly must be, whereby the supply spool could then run on. As a parameter a largely constant thread tension can be used to regulate the resistance to rotation to be used. The control is preferably carried out approximately synchronously with Changes in speed of the winding drive. Although the winding drive for the necessary rotation of the supply spool ensures it by regulating the rotational resistance the supply spool supports, if necessary by a corresponding Reduction of the resistance to rotation felt by an additional one Conveying movement of the supply spool, or when stopped by a then Increasing the resistance to rotation of the supply spool to avoid overrun.

In the system is the supply spool with a device for changing the rotational resistance fitted. The device then carries for the acceleration or that Stop the supply spool worry if the winding drive in the delivery device doesn't do this worried. This may be the case when accelerating the supply spool, but it is mainly when stopping the winding drive to stop the supply reel necessary.

The thread tension is determined favorably and the rotational resistance of the supply spool becomes regulated according to a reference thread tension. The winding drive has always a specific drive function for the supply spool. It can be the winding drive however, be supported in its drive function in a positive or negative sense, if the rotational resistance is regulated accordingly.

The resistance of the supply spool can be changed by actively turning the supply spool be reduced, but only to an extent that ensures that the winding drive always pulls and the thread is not relaxed.

The turning resistance is particularly useful when the winding drive is switched off the supply spool is increased by active braking until it stops. This will prevents the supply reel from running. To always have a certain basic thread tension to ensure it is expedient to use the switched off winding drive the braked supply spool and bring it to a standstill over the thread.

The regulation of the rotational resistance of the supply spool is either via thread sensor signals made, or by applying current to the winding drive representing run or stop signals, i.e. taking into account the current applied or the currentless state of the winding drive.

In a simple process variant, the rotational resistance of the supply coil is only changed between freewheel in their rotary position and complete standstill. The The supply spool is brought to a complete standstill as soon as it comes to a standstill of the winding drive effecting thread sensor signal occurs or the current is applied the winding drive is switched off.

The supply spool is expediently with an adjustable delay brought to a standstill to the mechanical load in the thread delivery device and also to keep low on the supply spool.

The turning resistance can be reduced when the winding drive or is switched on can even be done prematurely.

A slip rotary drive for the supply spool is able to match the winding drive Assist the removal of the thread without bringing about a complete synchronization, and also to delay the supply reel to a standstill. To do this, the Slip rotary drive can be switched between a promotional mode of operation and one braking operation.

A particularly simple embodiment of the system used as a device To change the rotational resistance of the supply spool, a controlled engagement and disengagement Brake device for the supply spool. In the disengaged state only that is Rotary resistance of the supply coil and its inertia effective. When engaging the braking device brakes the supply spool, preferably to a standstill, so that their overrun is avoided when the wicket drive stops.

A maximum signal is expediently used to engage the braking device a thread sensor, or a stop signal from the motor, or a signal that is derived from switching off the current supply.

The brake device can be disengaged as soon as a minimum size signal is delivered, which also for switching on the winding drive leads, or the running signal of the motor, the beginning of the application of current represents. However, it is possible to use the braking device much earlier disengage, namely as soon as the winding drive and also the supply reel to a standstill came.

The braking device is expediently provided with an adjustable delay indented to prevent excessive mechanical stress due to early stopping to avoid the thread while the winding drive is still running.

A brake device with a friction element that is attached to a brake element is structurally simple acts the supply spool and adjustable by a controlled drive device is. For this purpose, a pneumatic cylinder with or without spring storage, one Magnetic brake, an eddy current brake or the like can be used.

The run signal or stop signal of the motor of the winding drive is particularly expedient without galvanic connection by means of an external sensor without contact scanned, which is positioned on the housing of the thread delivery device so that it for example the application of current or the currentless state or the presence of a motor magnetic field can be scanned using the thread delivery devices insufficient external shielding for electromagnetic Fields and the like

The system is preferred for processing tensile thread material such as carbon fibers or the like. Used for functional reinforcing fabrics.

Fig. 1

schematisch eine Seitenansicht eines Fadenverarbeitungssystems,

Fig. 2

eine Detailvariante des Fadenverarbeitungssystems von Fig. 1,

Fig. 3

ein Drehmoment/Zeit-Diagramm, und

Fig. 4

ein Geschwindigkeits/Zeit-Diagramm mit zugehörigem Ein- und Ausschaltdiagramm.

Embodiments of the subject matter of the invention are explained with the aid of the drawing. Show it:

Fig. 1

schematically a side view of a thread processing system,

Fig. 2

2 shows a detailed variant of the thread processing system from FIG. 1,

Fig. 3

a torque / time diagram, and

Fig. 4

a speed / time diagram with associated switch-on and switch-off diagram.

A thread processing system S, in particular for processing tension-resistant thread material 1, such as carbon fibers or the like, has a thread Y consuming in FIG Textile machine L, for example a weaving machine, upstream of the textile machine L a yarn delivery device F, and upstream of the yarn delivery device F and structurally a supply spool B for the thread Y is separated from this. In the textile machine L a shed 1 is provided into which weft threads intermittently by means of an insertion device 2 are entered, the predetermined longitudinal sections of the thread Y are.

The thread delivery device contains a winding drive 4 with a in a housing 3 unspecified electric motor, its rotational speed, acceleration and deceleration or standstill controlled by a control device C. are transmitted to the engine run and stop signals. In the thread delivery device F at least one thread sensor 6 is provided, preferably a minimum size thread sensor and a maximum size thread sensor that measures the size of one on one Monitor body 8 formed thread supply 7 and signals to the control device C transmit as soon as the thread supply 7 the maximum size or the minimum size reached. When the maximum size is reached, the maximum thread sensor responds, by means of the signal, the control device C a stop signal outputs for the winding drive 4 that its current supply is switched off. The response of the minimum thread sensor when the minimum stock size is reached generates a signal on the basis of which the control device C sends a run signal to the Motor of the winding drive 4 outputs, by which the current supply is switched on and the winding drive 4 is accelerated. The axis of the thread delivery device F is indicated with Z and corresponds to the direction in which the thread delivery device F the Thread Y takes from the supply spool B.

The supply spool B carries a corresponding thread supply on a bobbin 9 10. The bobbin 9 is freely rotatable in bearings 11 in this embodiment stored. The axis of the coil former 9, indicated by X, is with respect to the axis Z of the yarn delivery device arranged approximately perpendicular to the yarn Y tangentially to be able to remove from the bobbin 9. With the bobbin 9 is one in this Embodiment flange-shaped brake element 12 firmly connected to the one Friction element 14 of a device regulating the rotational resistance of the supply reel B. D is aligned. The device D in this embodiment is one between one Engagement position and a release position adjustable brake 13 with a drive 15 for the friction element 14. It can be a pneumatic cylinder, which is acted upon pneumatically in both directions, or by one in one Actuating direction preloaded by a return spring pneumatic cylinder (spring-loaded cylinder). In the example shown, the drive 15 (pneumatic cylinder) is over one Solenoid valve 16 connected to a pressure source 18, wherein a pressure adjusting device 17 can be provided. The solenoid valve 16 is between a through position and a ventilation position can be changed and sent to a control device C2 of the device D connected. In between, a delay element V ' be provided with which the signal emitted by the control device C2, for example delayed for engaging the braking device over an adjustable duration can be.

On the flange-shaped brake element 12 of the supply coil B, a sensor 17 (for example an inductive sensor) aligned, which determines whether the supply coil B turns or stands still. The sensor 17 is connected to the control device C2 in order to For example, to confirm at least the standstill of the supply reel B. Over a Signal line 18 is the control device C2, for example with the control device C of the thread delivery device connected. In this way, either signal of the thread sensors 6 to the control device C2, or the stop or the run signal for the electric drive motor of the winding drive 4.

The thread processing system S in Fig. 1 is, for example, according to the diagrams controlled in Fig. 4. The supply spool B is standing. The braking device is still engaged or already disengaged. The winding drive 4 stands. The thread supply 7 has its maximum size. The textile machine L starts to use thread Y. As soon as the thread supply 7 reaches its minimum size depending on consumption, gives the minimal thread sensor 6 a signal to the control device C, the electric drive motor the winding drive 4 transmits a running signal and its current application turns. If not earlier, the braking device is now disengaged. The winding drive 4 accelerates to supplement the thread supply 7. simultaneously is built up in thread Y retroactively up to supply spool B thread tension, so that the tangentially removed thread Y synchronizes the supply spool B with the thread speed or the speed of the winding drive 4 rotates. Reached then the size of the thread supply 7, the maximum thread sensor 6, then this gives a signal to the control device C, whereupon the latter sends a stop signal to the Drive motor transmitted. This stop signal is also in the control device C2 processed to engage the braking device. The response behavior of the Braking device and also the deceleration in the delay element V 'are set so that the supply reel B is brought to a standstill at least as quickly as the winding drive 4 would come to a standstill. Preferably, the winding drive 4 brought to a standstill by the thread tension when braking the supply reel B.

As soon as the supply reel B has stopped and the winding drive 4 has come to a standstill the brake device can be released again.

Dashed line in Fig. 1 with the control line 19 indicates that the thread Y between the supply spool B and the thread delivery device F by a tensiometer T im With regard to the thread tension is scanned. The measured thread tension can alternatively or possibly additively as a parameter for indenting or disengaging the Brake device can be used. Then there is a connection to the control device C not required. As a further alternative, a pickup P is shown in broken lines indicated, which is connected via the line 18 to the control device C2. The Sensor P detects the currentless or energized state of the drive motor and emits signals representing these conditions. The Transducer the currentless or energized state of the drive motor Determine contactlessly from outside the housing 3 of the delivery device F.

In the upper diagram in Fig. 4 is the course of the speed V of the winding drive 4 shown over time t. The curves 25 drawn in solid lines clarify that from the occurrence of a minimum size signal or run signal S1 for the drive motor starts to run and from the occurrence of a maximum size signal or stop signal for the drive motor its speed decreases to zero.

The diagram below in Fig. 4 represents the control signals for the Braking device, namely an ON signal 26 and an OFF signal 28, for example can be formed by appropriate voltage levels. In the lower diagram is initially indicated that the control signal for the braking device from ON signal 28 is switched to the OFF signal 26 as soon as the run signal S1 occurs. Then when the stop signal S2 for the drive motor occurs again on Switched ON signal 28, but expediently with a delay V ' stop the supply spool B so that it just comes to a stop before the Winding drive would come to a standstill on its own. Dashed lines indicate 27 that the switch to the OFF signal 26 for the braking device already after occurs again shortly before the new run signal S1 occurs. This expediently takes place when the supply spool and the winding drive are reliable have come to a standstill. If necessary, it is also sufficient that Switching to the OFF signal 26 only when the running signal S1 occurs make. The renewed switchover from the OFF signal 26 to the ON signal 28 for the braking device occurs when the stop signal S 2 occurs for the drive motor, or with the then again effective delay V '.

The detail variant in FIG. 2 differs from that of FIG. 1 in that the Device D of the supply coil B is designed so that it has the rotational resistance of the Supply spool B, the winding drive 4 for the tangential removal of the thread Y has to be overcome, is variable in a positive and / or negative sense. To this The device D is designed as a slip rotary drive for the supply reel B, for example by means of a reversible rotary drive 5, a friction roller 20, and the flange-like brake element 12, which here as a drive and brake element acts. The device D assists the winding drive 4. For example, a limited torque is applied to the supply reel B in the conveying direction, so that the winding drive 4 does not do the whole, for turning and / or accelerating the supply reel B has to apply the required torque alone. It can Delivery torque of the device D kept constant at a certain level or to the speed profile or torque profile of the winding drive 4 be adjusted when operating the thread delivery device F. For braking the supply spool B, the rotary drive 5 is stopped, or the direction of rotation reversed, and the supply reel B is decelerated or braked or even braked to a standstill. The control device C can either via the control line 18 with the Control device C or the sensor P or connected to the tensiometer T. his. In this way, for example, a relatively uniform thread tension profile can be achieved generate and relieve the winding drive 4.

In the diagram of FIG. 3, the solid curve 21 shows the torque curve in Yarn feeder. Dashed curve 22 indicates that device D is the supply spool B accelerates to a certain torque level, then this maintains, and only when the stop signal S2 occurs for the drive motor of the winding drive the torque is reduced and even a braking torque 24 is applied. The dash-dotted curve 23 shows that the torque curve of the Device D is adapted to the torque curve of curve 21, however, that a certain thread tension is always generated by the winding drive 4 must, which expediently never goes to zero. It is also possible to change the speed and the acceleration and deceleration of the supply reel B exactly the speed, acceleration and deceleration of the winding drive 4 to adapt, but always with a slight difference to always one to maintain certain minimum thread tension and the thread at no time to relax completely. In principle, preference is given to an arrangement in which the axis X is substantially perpendicular to the axis Z. If the thread Y something is deflected between the supply spool B and the thread delivery device F are other relative positions of the respective axes are also possible, but this is always ensured must be that the thread Y is tangentially removed from the supply spool B. becomes.

Claims (17)

1. Method for controlling a yarn processing system (S), comprising a yarn consuming textile machine (L), a yarn feeding device (F) upstream of the textile machine, and a supply spool (B) upstream of the yarn feeding device, said yarn feeding device pulling off a yarn (Y) from said supply spool with varying speed to form and maintain a yarn intermediate store in said yarn feeding device by means of a controlled winding drive (14) which yarn intermediate store serves to cover the yarn consumption demand of the textile machine at any time, the rotatable supply spool (B) being rotated by the yarn (Y) during pulling-off at least by the yarn tension generated by the winding drive (4), such that the yam (Y) is taken off tangentially from the supply spool (B) characterized in that the rotational resistance of the supply spool (B) which has to be overcome via the yarn (Y) by the winding drive (4) is actively regulated substantially in synchronism with controlled speed variations of the winding drive (4) in view to a widely constant yarn tension.
2. Method as in claim 1, characterized in that the yarn tension is determined and that the rotational resistance of the supply spool (B) is regulated according to a set reference yarn tension.
3. Method as in claim 1, characterized in that the rotational resistance of said supply spool (B) which is to be overcome by the winding drive (4) is regulated by actively rotating the supply spool in conveying direction, preferably, however only in part.
4. Method as in claim 1, characterized in that, when the winding drive (4) is switched off, the rotational resistance of said supply spool (B) is increased by actively braking the supply spool to standstill.
5. Method as in claim 4, characterized in that the switched off winding drive (4) is brought to standstill via the yarn (Y) by the braked supply spool (B).
6. Method as in claim 1, characterized in that the current supply of the winding drive (4) in the yarn feeding device (F) is controlled with the help of yarn sensor signals monitoring a predetermined size range of the intermediate yarn store in the yarn feeding device (F), and that the rotational resistance of the supply spool is regulated on the basis of the yarn sensor signals or of run signals or of stop signals (S1, S2) representing the current supply.
7. Method as in claim 1, characterized in that the rotational resistance of the supply spool (B) only is varied between a free running condition and a complete standstill, and that until the standstill of the supply spool occurs the rotational resistance is increased on the basis of a yarn sensor signal or of the stop signal (S2) or of a currentless condition of the drive motor, respectively, each effecting a standstill of the winding drive.
8. Method as in claim 7, characterized in that the rotational resistance of the supply spool (B) is increased until the standstill of the supply spool is effected with an adjustable delay (V') in relation to the occurrence of the yarn sensor signal or of the stop signal (S2), respectively, or with an adjustable ramp function.
9. Method as in claim 1, characterized in that the rotational resistance of said supply spool (B) is decreased at or in advance of the occurrence of the yarn sensor signal or of the run signal (S1) as generated for accelerating the winding drive (4).
10. Yam processing system (S) comprising a yam consuming textile machine (L), a yarn feeding device (F) arranged upstream of the textile machine, and a supply spool (B) arranged upstream of the yam feeding device (F), the yarn feeding device (F) having a winding drive (4) monitored by a control device (C) for the formation of a yarn store (7) in the yarn feeding device which yarn store (7) covers the consumption at any time but varies in size according to the consumption, the supply spool (B) being rotatable and being positioned relative to the yarn feeding device for a tangential yarn take-off, and the winding drive (4) via the generated yarn tension also constituting a rotational drive for the supply spool (B) characterized in that a device (D) is provided for varying the rotational resistance of the supply spool (B).
11. Yarn processing system as in claim 10, characterized in that the device (D) comprises a rotational slip drive (5, 20) for the supply spool (B) which rotational slip drive (5, 20) is adjustable between a conveying operation mode generating a driving torque lower than the torque generated by the yarn tension, and a braking operation mode, preferably up to the generation of a braking torque (24) for stopping the supply spool (B).
12. Yarn processing system as in claim 10, characterized in that the device (D) is a braking device (12, 14, 15) for the supply spool (B) which braking device can be engaged and disengaged in controlled fashion.
13. Yarn processing system as in claim 12, characterized in that a signal generating yarn sensor (6) is provided in the yarn feeding device for monitoring at least the maximum size of the yarn store (7), the yarn sensor (6) co-operating with the control device (C) of the winding drive (4) for switching off the current supply of the drive motor, and that the braking device at least is engageable with the occurrence of the signal of the maximum sensor or with the occurrence of the stop signal (S2) of the said drive motor.
14. Yarn processing system as in claim 12, characterized in that a yarn sensor (6) is provided in the yarn feeding device (F) for monitoring the minimum size of the yarn store, the yarn sensor (6) co-operating with the control device (C) for supplying the drive motor of the winding drive (4) with current, and that the braking device is disengageable with the occurrence of the signal of the minimum yarn sensor (6) or of the run signal (S1) of the motor, respectively.
15. Yarn processing system as in claim 13, characterized in that the braking device (D) is engageable with an adjustable delay (V') after the occurrence of the signal of the maximum yarn sensor (6) or of the stop signal (S2) of the motor.
16. Yarn processing system as in claim 12, characterized in that the braking device comprises a friction element (14) acting on a braking element (12) of the supply spool (B), the friction element (14) being displaceable between engagement and disengagement or release positions by a controlled driving device (15), preferably by a pneumatic cylinder or by a spring loaded cylinder.
17. Yarn processing system as in at least one of claims 13 or 14, characterized in that the run signal or the stop signal is detected at said yarn feeding device contactlessly and without a galvanic connection by means of an external pick-up (P).

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