WO2003038172A1

WO2003038172A1 - Yarn feeding device and method for yarn feeding

Info

Publication number: WO2003038172A1
Application number: PCT/EP2002/012216
Authority: WO
Inventors: Roberto Bertolone
Original assignee: Iropa Ag
Priority date: 2001-11-02
Filing date: 2002-10-31
Publication date: 2003-05-08
Also published as: CN1582347A; EP1442167A1; DE10153856A1; CN1582347B; US20050081945A1

Abstract

The invention relates to a yarn feeding device (B) of a weaving machine (W), comprising at least two yarn feeding appliances (F1, F2) delivering the same yarn quality in a weft mixing process. Each yarn feeding appliance comprises a variable speed control system (C), a sensor arrangement (6) which supplies control signals for the size of the reel, and at least one fault sensor (Z1, Z2), by which means a fault signal (X) indicating a change in the weft mixing condition, e.g. a yarn break in the upstream from the reel, can be emitted. According to the invention, a fault signal transmission link (Q1, Q2) is provided by each yarn feeding appliance for the speed control system (C) of each other yarn feeding appliance, and an over-regulation routine (6) is provided in each speed control system (C), said routine enabling the speed to be increased before the change in the weft mixing condition, by means of the fault signal (X), independently from the control signals of the sensor arrangement (6).

Description

Thread delivery device and method for thread delivery

The invention relates to a thread delivery device of the type specified in the preamble of claim 1 and a method for thread delivery according to the preamble of claim 8.

It is e.g. known from EP 0 195 469 A to supply a weaving machine with the thread delivery device with at least two thread delivery devices the same thread quality in a mixed change. This leads to a uniform fabric quality and reduces the operational load of each thread delivery device because it has a lower working frequency and runs with lower speed variations. There is also an additional safety aspect, which leads to higher efficiency, because in the event of a thread break between the supply spool and the thread spool in the thread delivery device or when a supply spool is empty, the at least one further thread delivery device can at least temporarily take over the delivery function for the faulty delivery device. The weaving machine does not need to be switched off because of this fault. As soon as one thread delivery device takes over the delivery function of another, the delivery frequency of the receiving thread delivery device increases. If there are more than two thread delivery devices in the group for the same thread quality, then all other thread delivery devices may share the delivery function of the faulty thread delivery device. After the fault has been eliminated, the faulty thread delivery device can take over its delivery function again. This is a well-known and proven working principle.

Basically, the aim is to make the thread winding of a thread delivery device only large enough that the normal consumption can be covered by the weaving machine without drastic speed changes in the thread delivery device. An unnecessarily large size of the thread wrap could cause other malfunctions. In addition, so-called thread separations are often used in thread delivery devices, ie the thread windings in the thread winding on the storage body are separated from one another by intermediate distances so that the windings do not interfere with one another. Different thread qualities require different thread separations. When processing, for example, difficult thread material such as polypropylene with a ribbon or square cross-section on weaving machines with a large weaving width (over 5 m or more), so-called HD thread delivery devices (heavy duty) with very powerful drive motors are used for the thread material, particularly on projectile or rapier weaving machines. Such thread material is difficult to process and requires a strong thread separation on the storage body. Powerful drive motors are required to be able to accelerate and decelerate strongly in all operating conditions and to be able to overcome the possibly high and varying pulling resistance from the supply spool. The size of the thread winding on the storage body is also relatively small because of the strong thread separation, ie just enough to cover consumption when changing the mix with a low delivery frequency of each thread delivery device. The speed control is carried out in such a way that control signals are derived from the actual size of the thread winding that is being scanned, with which the drive motor is accelerated or decelerated, driven at a uniform speed, or stopped in some cases. A maximum speed is set as a threshold. The usual equipment of a thread delivery device includes at least one fault sensor, which generates a fault signal in the event of a thread break between the supply spool and the thread spool or when the supply spool is empty. This fault signal is transmitted to the control device of the weaving machine and can, if necessary, be used to switch off the weaving machine. The fault signal can also be processed in the control device of the weaving machine in such a way that the weaving machine controls the thread selector that is usually provided in such a way that it ignores the thread channel of the disturbed thread delivery device and switches over to taking over the delivery function by another thread delivery device. The receiving thread delivery device or the receiving thread delivery devices of the group is not already informed of this change in the mixed change when the fault signal is given, because each thread delivery device works autonomously and only dependent on consumption. Ie the receiving Fadeπ delivery device experiences the increased delivery frequency only by responding to its sensor arrangement. Since the thread winding can then only be relatively small, the drive motor of the thread delivery device is often no longer able to supplement the thread winding quickly enough to cover the then higher individual consumption, so that the thread winding is emptied, the thread tension increases and, in the case of a projectile weaving machine, the projectile reaches the opposite fabric edge too late. This leads to the weaving machine being switched off, although the further operation of the weaving machine itself would be ensured by the thread delivery device taking over. In other words, the yarn delivery device that takes over at least part of the delivery function of a disrupted yarn delivery device is not able to adapt to the currently increasing individual consumption quickly enough because the yarn delivery device only accelerates autonomously when its sensor arrangement emits a purely consumption-dependent control signal for acceleration. Then the accelerating power of the drive motor is not sufficient. Extreme acceleration could also tear the thread. Making the thread wrap large from the start could in turn lead to other malfunctions.

The starting point here is that the yarn delivery device taking over the delivery function of a disrupted yarn delivery device may not deliver at the time of the disruption and in principle runs at an appropriately adapted individual speed which cannot cope with a higher delivery frequency.

The invention is based on the object of specifying a thread delivery device of the type mentioned at the outset and a method for thread delivery with which malfunctions are avoided in the event of a higher delivery frequency for at least one thread delivery device.

The object is achieved with the features of claim 1 and according to the method with the features of claim 8.

In the thread delivery device, the fault signal is transmitted in real time via the signal transmission link to the variable speed control of the at least one further thread delivery device in the group, which continues to operate without interference. The fault signal is taken as an opportunity to immediately increase the speed in the receiving thread delivery device, provided, of course, that the speed is not already the maximum speed. By increasing the speed, the thread winding is immediately responding to the disturbance. tion signal increased, so that in the event of a change in the mixed change condition forcing a higher individual delivery frequency following the failure signal, the amount of thread on the storage body is sufficient to cover the higher demand without the thread winding being emptied. As a result, no such malfunction can result from the change in the mixed change condition in the thread channel of the receiving thread delivery device.

According to the method, the thread reel is preparatively enlarged with a regulating speed increase by the transmission of the fault signal in real time to the speed control of the receiving thread delivery device, so that the thread delivery device copes with the difficult transition phase from changing the mix at an individually low frequency to a higher delivery frequency without emptying the thread reel. As soon as the transition phase is over, the thread delivery device is in any case able to deliver at the higher delivery frequency, since the variable speed control has adjusted to the new situation or is set to a higher speed level if a sufficiently large one was previously in the transition phase Thread wrap was present.

The design of the thread delivery device, which makes it possible to transmit a fault signal alternately in real time between the thread delivery devices of the group, and to increase the speed in preparation, is particularly expedient if HD thread delivery devices are provided with powerful drive motors and strong thread separation, in particular on projectiles - or rapier weaving machines with a large weaving width and with difficult thread qualities. Large weave widths are to be understood as 5.0 m and more. Difficult thread material would be, for example, polypropylene with a ribbon or square character, which can generate a relatively high draw-off resistance from the supply spool.These conditions, in combination, contribute to the fact that a thread delivery device taking over the delivery function of another thread delivery device can be emptied in the transition phase and then itself goes into trouble ,

In terms of control technology, the fault sensors of the group's thread delivery devices are connected to a common interface. The interface is over a link is connected to the weaving machine control device, so that the weaving machine control device is able to use the fault signal, for example, to tune the thread selector to the change in the mixing change condition. The signal transmission path for real-time transmission of the respective fault signal of the thread delivery device to at least one further thread delivery device of the same group expediently branches off in front of the link in the interface. In this way it can be achieved that the fault signal can be used with the same intensity and meaningfulness both in the control device of the weaving machine and in the speed control of the thread delivery device concerned. The signal transmission path could alternatively run via the control device of the weaving machine.

Autonomous thread delivery devices that do not require an informative or controlling connection to the weaving machine for their delivery function, but instead only react automatically to the thread consumption, usually have a variable speed control in which the control signals of the sensor arrangement are processed, optionally alternative sensor signals for counted wound and counted wound turns and / or reference sensor signals. The speed control depends only on the information provided by the sensor arrangement and the other sensor signals mentioned about the current size of the thread winding or its size change tendency. For these reasons, the transmitted disturbance signal is taken into account in a regulating manner, i.e. other control signals are then not taken into account. The override routine can be easily installed on the software in the speed control, which is usually equipped with a programmable microprocessor.

The interference signals can be brought into the interface via opto-couplers or combined in the interface on the way to the weaving machine control device via opto-couplers.

Since the thread selector must be informed of a change in the mixed change condition in order to ignore or block the thread channel of the faulty thread delivery device, it is expedient to use the thread selector either directly in real time with the Adjust fault signal, or as before via the control device of the weaving machine.

Each group can also include more than two thread delivery devices for a thread quality. Then there are different options. Either only one of the groups is entrusted with the takeover of the thread delivery function of the faulty thread delivery device, or all other thread delivery devices share the delivery function to be taken over. Depending on the selected principle, a signal transmission path is only for one thread delivery device or signal transmission paths are provided for all thread delivery devices in the group. The same procedure is followed for multicolor mixed change weaving with several thread qualities or colors and several thread delivery device groups.

An embodiment of the subject matter of the invention is explained with reference to the drawing. Show it:

1 schematically shows a thread processing system with two thread delivery devices,

Fig. 2 in the manner of a block diagram control-side details of the thread processing system of Fig. 1, and

Fig. 3 shows two diagrams that illustrate the method based on the speed of the

Illustrate thread delivery devices over the angle of rotation of the loom or the time schematically.

The invention is explained on the basis of a projectile weaving machine W, for example with a weaving width of more than 5.0 m (FIG. 1), and a thread delivery device B, which consists of a group of two HD thread delivery devices F1, F2 with powerful drive motors M and relatively large Thread separation S exists and, for example, provides polypropylene thread material (thread Y1, Y2) of band-like or square character of only one thread quality in the change of mix. The thread delivery device B could contain more than two thread delivery devices, or even at least one further group for a different thread quality. The invention is also applicable to rapier weaving machines and possibly even to jet weaving machines. In normal operation, a mixed-change process is used, ie each thread delivery device delivers one weft thread or several weft threads in succession before another thread delivery device delivers one weft thread or several weft threads in succession. The thread delivery device B is also designed such that it is taken out of operation in the event of a fault such as a thread break upstream of its thread winding and its delivery function is taken over by at least one other thread delivery device of the same group. -

Each thread delivery device F1, F2 is assigned a thread channel K1, K2, which leads via a thread selector D to an insertion device E of the weaving machine W. The thread selector D transfers the thread Y1 or Y2 of the thread delivery device F1, F2 currently working to the entry device E, which enters this thread into the shed of the weaving machine W. The other thread channel is blocked during this time. The thread selector D is controlled, for example, via a control device CU of the weaving machine.

The respective thread delivery device F1, F2 takes the thread Y1 (or Y2) from a supply spool 1 and winds it with a driven winding element 2 into a thread winding 8 on a storage body 3. The thread turns in the thread winding 8 are spaced apart from one another in the axial direction (thread separation S ). The thread Y1 is drawn off from the thread winding 8, for example by a pull-off brake 4 and a thread-guiding element 5.

For the drive motor M, a variable speed control C (for example equipped with a microprocessor) is provided, which is connected to a sensor arrangement 6 and from which control signals, for example a minimum sensor Min and a maximum sensor Max, are used as control signals for accelerating, decelerating, driving or stopping the drive motor M. receives. The sensor arrangement 6 scans the size of the thread winding 8 on the storage body 3. Alternatively, a differently configured sensor arrangement can be used, for example a reference sensor (not shown) and / or counting sensors for wound and unwound Includes turns. The speed control C is designed in such a way that its size (number of turns) forms a thread winding 8 on the storage body 3 which is adapted to the average consumption, so that the drive motor M largely adjusts the individual consumption when changing the mixture steady speed runs lower than the set maximum speed.

In addition, at least one fault sensor Z1 or Z2 is provided, which detects, for example, whether the thread between the supply spool 1 and the thread spool 8 or in or when it emerges from the winding element 2 is broken or the supply spool 1 is emptied. In this case, the fault sensor Z1 and / or Z2 generates a fault signal which is transmitted to an interface G. The disturbance signal is indicated as a rectangular pulse X. The fault signal X is transmitted to the control device CU of the weaving machine W, which e.g. controls the thread selector D in such a way that changes in the mixing change condition are taken into account in the future and the faulty thread channel, e.g. K1, is blocked.

The second thread Y2 comes from a second thread delivery device F2 with the same equipment and training.

A signal transmission path Q2 leads to the speed control C of the thread delivery device F1, via which the fault signal X can be transmitted by the other thread delivery device F2 (by its fault sensor ZV and / or Z2 '). A speed control routine U is provided in the speed control C, which increases the speed of the drive M when the fault signal X is received, e.g. up to the maximum speed.

The thread winding 8 is preliminarily enlarged by the speed increase, so that the thread winding 8 is not emptied during the subsequent transition to a higher delivery frequency of the thread delivery device F1. After the transition phase (the duration of the speed increase can be programmed or terminated by the next response of the maximum sensor Max), the thread delivery Thanks to the enlarged thread winder 8, the remote device F1 is autonomously able to adapt itself to the now higher delivery frequency automatically and without problems.

The control device CU of the weaving machine W is assigned a switch 7, which is then actuated if a fault should also occur in the yarn delivery device F1 which is now delivering with the higher delivery frequency and which jeopardizes the consumption coverage of the weaving machine.

In Fig. 2, the two thread delivery devices F1, F2 of the thread delivery device B are schematically incorporated into a block diagram showing the interface G. In the event of a fault, the fault signal X is transmitted from the respective fault sensor Z or Z of a thread delivery device F or F2 to the interface G. From the signal transmission path to a link 13 (with optocouplers), a signal transmission connection Q1 or Q2 branches off to the speed control C of the respective other thread delivery device F1 or F2 of the delivery device B in the manner of a switch. A signal transmission path 14 leads from the link 13 to the control device CU of the weaving machine.

The override routine U of the speed control device C can, for example, be installed on the software side. Interface G contains a circuit board on which e.g. Different opto-couplers can be installed.

The method is described with reference to FIG. 3, provided that a thread break between the supply spool 1 and the thread spool 8 or an empty running of the thread spool 1 has occurred in the thread delivery device F2 and a fault signal X has been emitted.

The upper diagram in FIG. 3 shows that in mixed-change operation with the frequency of deliveries PF1 (thread Y1), motor M in thread delivery device F1 runs at an approximately uniform speed (curve 15) that covers the consumption of the delivery frequency for PF1. In the pause between two deliveries PF1, the other thread delivery device F2 (lower diagram) carries out a delivery PF2. The motor M of the second thread delivery device F2 also runs with essentially the same shaped speed, adapted to the mix change consumption with the delivery frequency for PF2 (curve 15). The respective, essentially identical speeds are lower than the respectively set maximum speed Vmax.

A fault now occurs in the thread delivery device F2, e.g. a thread break. The fault signal X is generated and transmitted to the speed control C of the thread delivery device F1. The fault signal X in the thread delivery device F1 now causes the speed of the curve 15 to be raised immediately with, for example, a predetermined speed increase R, e.g. along the curve part 16 up to the maximum speed Vmax or along the curve part 16 'while settling (at 19) finally up to a higher speed level (curve part 17) which is adapted to the higher delivery frequency for PF1 + PF2. If the maximum sensor Max in the thread delivery device F1 responds at the maximum speed Vmax, the higher speed level (curve part 17) is then reached in a steady state. The speed setting and the speed increase R take place depending on the design of the speed control and / or the sensor arrangement. The thread winding size is in any case sufficient due to the increase R to enable the speed control C of the thread delivery device F1 to adapt easily to the higher delivery frequency PF1 + PF2 and especially in the transition phase of the thread delivery device F2 from only PF1 deliveries to PF1 + PF2 - Deliveries to avoid emptying the thread package 8. Without the speed increase R with the transmitted disturbance signal X, the speed from the curve 15 would only increase after a delay to the fault (for example after the minimum sensor Min has responded), for example along the curve part 18, which could mean emptying the thread package, because then the consumption by those added Deliveries PF2 for the drive motor M is too high.

Claims

claims

1. Thread delivery device (B) of a weaving machine (W), with at least one group of at least two thread delivery devices (F1, F2) delivering the same thread quality (Y1, Y2) in a mixed change, each of which has a variable speed control (C) for one Winding element (2), a sensor arrangement (6) connected to the speed control (C) and providing control signals for the thread winding size on a storage body (3), and at least one fault sensor (Z1, Z2, Z, Z ') is provided with which a fault signal (X) indicating a change in the mixed change condition can be emitted, characterized in that each thread delivery device (F1, F2) in the group provides a real-time fault signal transmission path (Q1, Q2) for speed control (C) of at least one further thread delivery device in the group and that a speed control routine (U) is provided in each speed control device (C) with which the fault signal (X), independently of control signals from the sensor arrangement (6), the speed of the winding element (2) can be raised prematurely to change the mixed change condition.

2. Thread delivery device according to claim 1, characterized in that the thread delivery devices (F1, F2) of the group are similar HD thread delivery devices with powerful drive motors (M) and strong thread separation (S) on the storage body (3), in particular for projectile or rapier weaving machines with a wide weave.

3. Thread delivery device according to claim 1, characterized in that the fault sensors (Z1, Z2, Z, Z ') of the thread delivery devices (F1, F2) of the group are connected to a common interface (G) which are connected to a via a link (13) Loom control device (CU) is connected, and that each signal transmission path (Q1, Q2) branches in front of the link (13) for speed control (C) of at least one further thread delivery device (F1, F2) of the group.

4. Thread delivery device according to claim 1, characterized in that the override routine (U) is installed on the software side in the speed control (C).

5. Thread delivery device according to claim 3, characterized in that at least the link (13) is an opto-coupler.

6. Thread delivery device according to claim 1, characterized in that a controlled thread selector (D) is provided on the weaving machine (W), which only releases one thread channel (K1) in accordance with the mixed change condition, and that the thread channel of a faulty thread delivery device is provided by the thread selector (D ) can be blocked either by means of the fault signal (X) or via the control device (CU) of the weaving machine (W).

7. Thread delivery device according to claim 1, characterized in that the group comprises more than two thread delivery devices (F1, F2), and that the fault signal (X) of a thread delivery device to the speed control (C) of only one further thread delivery device or the speed controls (C) of all other thread delivery devices of the group is transferable.

8. Method for thread delivery into a weaving machine (W), in which the same thread qualities (Y1, Y2) are delivered by at least two thread delivery devices (F1, F2) of at least one group per itself in a mixed change, whereby to produce a consumption-covering winding size on a storage body ( 3) the speed of each thread delivery device is variably controlled, taking into account control signals derived from the thread winding size, and a fault signal (X) is generated in the event of a malfunction-related change in the mixing change condition, characterized in that the fault signal (X) of a thread delivery device (F1, F2) in Transfer in real time to a variable speed control (C) of at least one further thread delivery device (F2, F1) of the group and the speed of the further thread delivery device for the preparatory enlargement of the thread winding size for changing the mixing change condition with a speed increase up to at most a predetermined maximum speed (Vmax) is brought.