EP0872585B1 - Loom with dobby and method for controlling such a loom - Google Patents

Description

The invention relates to a dobby loom and a Method for controlling a dobby loom according to the Preamble of the respective independent patent claim.

Known dobby looms include a loom for Entry of a weft as well as a dobby as Device for forming the shed. The weaving machine and the dobby are usually about one Transmission device, for example via a Coupling and a gearbox, can be coupled and have a common in the coupled state Powertrain on. This common driveline will by means of a drive - usually by means of a Motors - in turn drives and drives both Loom as well as the dobby.

Shaft weaving machines of this type have the disadvantage that that an engine with high power output is required is, especially when driving a large one Dobby (e.g. due to a large number heavy heald frames or through a large weave width). Furthermore varies both in the weaving machine as well with the dobby the freewheel required Torque, depending on the angle of rotation (current circulation position). Most of all, this will be caused by various oscillating mass-related components of the individual machines. With increasing size of the dobby and with the increasing speed of the weaving machine increases this induced load on the entire drive train, especially between the loom and Part of the drive train arranged in a dobby, but also the load on the engine. In addition comes that the required torque is additional depends on other operating parameters, e.g. of the Speed, of the type of fabric or of the fabricated Template.

Especially those that occur when the machine is started Torques as well as those due to fluctuations in the Speed-induced torque fluctuations the performance of the engine and / or the permissible Drive train load exceed, at least shorten its lifespan considerably. Then it is not only necessary a more powerful engine to provide, but the entire drive train must be reinforced in such cases - so it must stronger shafts, gears, couplings, bearings etc. be provided, which is a significant technical Effort means and the machine is significantly more expensive.

In the field of jacquard weaving machines it is from the EP-A-0 736 622 known, one of the drive of the Auxiliary motor for the weaving machine Jacquard device and provide the drive shaft the loom with the drive shaft of the Jacquard device via a synchronization wave couple. The drive shaft is by means of this auxiliary motor the jacquard device can also be driven. The Auxiliary motor is used - with appropriate control Relief of the drive of the weaving machine, as well as Relief of the entire drive train. At the same time provides the synchronization wave for a more or less good synchronization of weaving machine and Jacquard facility. Now to determine which one Torque to relieve the drive of the weaving machine or to relieve the drive train from the Auxiliary motor must be applied is an angle encoder provided that the respective circulation position of the The drive shaft of the jacquard device is detected and feeds a controller. The controller then determines-in Knowledge of the desired weaving pattern and knowledge the torques required at the respective angle of rotation (The required torques must therefore be the control for every angle of rotation before the machine starts be known) - that to be applied by the auxiliary engine Torque to drive the loom as well relieve the entire drive train.

Those described in said EP-A-0 736 622 Jacquard weaving machines are basically functional. However, the suggested course of action is for Doom looms, especially for large ones Doom looms with heavy shafts, not easy applicable. Because of the large oscillating Masses and by speed fluctuations and others Torque fluctuations caused by operating parameters is the connection between that actually torque applied along the drive train and the respective rotational position of the drive shaft Dobby especially for large dobby in not constant in practice and therefore not or at best, only very inaccurately predictable. An exact Prediction of what will occur along the drive train Torque depending on the particular In any case, circulation position is not in practice possible. Therefore, along the Powertrain, especially in the between dobby and loom arranged part of the drive train, very high torques occur. To a high degree Reliability or availability of the machine too guarantee, would have to take similarly complex measures with regard to the dimensioning of the drives and Drive train are taken as described above.

Furthermore, from EP-A-0 743 383 Doom loom known according to the preamble of claim 1, according to a similar Principle works like the one already explained above Jacquard weaving machine. This machine also has a Main motor for driving the loom, with a mechanical transmission device a dobby (or alternatively with a Jacquard device) is coupled. Furthermore, a Auxiliary motor provided on the dobby, the Main engine or the drive train relieved. Also the Type of control of the auxiliary motor described here sets assumes that this is for driving the dobby a certain speed required torque for every rotation angle (rotation position) before the start of the Machine control is already known, be it now by one before the machine started "Theoretical" determination of the required Torque or through values determined during test runs for the torque. Because of the large oscillating masses, especially with large ones Dobby with heavy stems, and because of the due to speed fluctuations and other operating parameters caused torque fluctuations, however, that is actually abutting the powertrain Torque depending on the rotating position in the Practice not or at best only very imprecisely predictable. Especially in the between loom and dobby arranged part of the drive train large torques can still occur. Therefore correspondingly complex measures would also be required here with regard to the dimensioning of the drives and Powertrain to be taken to a high level Reliability and availability of the machine too guarantee.

It is therefore an object of the invention to Propose dobby loom in which this large Effort - namely a more powerful engine to provide and all parts of the drive train to reinforce - can be avoided, especially for the case of large dobby machines with heavy ones Shafts and high speed. At the same time a economical and reliable operation of such Doom loom can be guaranteed.

This task is solved with a dobby loom according to claim 1. Further advantageous Embodiments of the dobby loom according to the invention result from the dependent patent claims. The The task is solved procedurally according to the independent procedural claim.

According to the invention, at least in the shaft loom a sensor in the area between the weaving machine and the Dobby or in each case to this area adjacent end area of the weaving machine or the Dobby arranged. The sensor located there (several sensors can also be provided for this) detects what is actually on the drive train Torque. Usually occur in the area mentioned the largest caused by the torque Changes (e.g. the greatest torsion of the Drive shaft) because the torque fluctuations completely much of the large oscillating masses in the Dobby and the loom are caused. The changes caused by this are in the area mentioned is particularly easy to grasp. The sensor is connected to a control, which the auxiliary drive (e.g. an auxiliary motor) so that fluctuations the area between the weaving machine and the Dobby torque and / or Fluctuations in the speed can be reduced. To this Relief of the main drive and the entire powertrain so that it is possible Standard motors as the main drive, as well Standard drive shafts, couplings and bearings also for heavy dobby use what the effort significantly reduced. A reinforcement of individual or all parts of the drive train and replacing the Standard drive motor by a more powerful this makes it obsolete.

In an advantageous embodiment of the The shaft loom according to the invention is the sensor or Parts of it (e.g. a strain gauge arrangement) arranged the drive train. In this way, the representative size for that at the respective time torque applied directly on the drive train are and will not be falsified. Furthermore the torque does not have to be on any elaborate detours can be determined.

A sensor that comes into question in particular is the an electrical signal in function of the actually torque applied, so for example a Sensor comprising a strain gauge assembly. The strain gauge arrangement is directly on arranged the drive train. Of course the sensor has to also a suitable transmission element (a Transmitter) for transmitting the signal from the in operation rotating drive train to one in operation have fixed machine parts. A Strain gauge assembly located on the drive train is arranged, is therefore particularly suitable to detect the torque because its output signal is directly proportional to the torque applied (Alternatively, sensors are also suitable for measuring Shear stresses). The applied torque can thus quickly and unadulterated from the sensor signal be won.

Sensors that act as angle encoders can also be used trained and in the longitudinal direction of the drive train considered offset from each other. The Angle encoders record the current position of each Part of the drive train. Because every part of the Drivetrain is elastic to a certain extent can - when torque is applied and when sufficient good resolution of the sensors - between two different positions of the drive train Angular difference can be recorded. This angular difference is a measure of the applied torque, since the Angular difference caused by the torque. So the signal from a single sensor is in it Case not representative of the torque, but it is it is the named angle difference. In addition, with this type and arrangement of sensors also the Monitor the current speed in each case.

Furthermore, a sensor is also possible, which as Force sensor is designed and arranged so that it captures reaction forces from the applied Torque on a part of the Dobby looms, e.g. on one Bearings or on a gear box. The sensor signal is then a direct measure of the torque applied.

Another advantageous embodiment of the The dobby loom according to the invention also has Main drive and another for the auxiliary drive the part of the Drive train connectable drive. This additional drive, typically a motor and includes a creeper gear comes in looms used for example in the search for a shot to Shed can be opened independently of the main drive. The Auxiliary drive provided according to the invention is now in the Able to drive this additional (creeper) to relieve considerably. The auxiliary drive is corresponding precisely controllable, it is in principle possible that the Auxiliary drive the function of the (creeper) drive takes over and thereby the additional mentioned here (Creeper) drive is not required. At least but can the additional (creeper) drive from the Auxiliary drive provided according to the invention considerably be relieved.

In the method according to the invention, at least one sensor between the loom and the dobby or in this area adjacent end regions of the weaving machine and the Dobby is arranged on the drive train applied torque and a corresponding Signal fed to a regulation. Because of this signal the auxiliary drive is controlled by the control that fluctuations in between the weaving machine and the Torque applied to the dobby. This eliminates the effort already mentioned above reinforcement of the main drive and parts of the Drive train, especially of shafts, bearings, Gearboxes and clutches avoided.

Fig. 1

ein Ausführungsbeispiel einer erfindungsgemässen Schaftwebmaschine,

Fig. 2

einen Ausschnitt des Antriebsstrangs, auf welchem eine Dehnungsmessstreifenanordnung befestigt ist,

Fig. 3

einen Ausschnitt des Antriebsstrangs mit zwei in Längsrichtung des Antriebsstrangs versetzt angeordneten Winkelgebern,

Fig. 4

ein Ausführungsbeispiel eines Getriebes mit Lagern, an welchen durch das Drehmoment Kräfte hervorgerufen werden,

Fig. 5

ein weiteres Ausführungsbeispiel eines Getriebes mit Lagern

und

Fig. 6

eine vergrösserte Darstellung eines Lagers mit einem Kraftaufnahme-Sensor.

The invention is explained in more detail below with reference to the drawing. In a schematic representation:

Fig. 1

an embodiment of a dobby loom according to the invention,

Fig. 2

a section of the drive train on which a strain gauge arrangement is attached,

Fig. 3

a section of the drive train with two angular sensors arranged offset in the longitudinal direction of the drive train,

Fig. 4

an embodiment of a transmission with bearings, on which forces are caused by the torque,

Fig. 5

another embodiment of a transmission with bearings

and

Fig. 6

an enlarged view of a bearing with a force sensor.

The embodiment shown in Fig. 1 Dobby loom according to the invention comprises a Weaving machine 1 and a dobby 2. The weaving machine 1 and the dobby 2 are by means of a mechanical transmission device, which a Coupling 3 includes, can be coupled to each other, so that they in coupled state a common drive train have, of which only the Part 4 between loom 1 and dobby 2 is shown. The shaft loom also includes a arranged on the loom 1 main drive in Shape of a motor 5 (usually an electric motor) and one arranged on the dobby 2 Auxiliary drive in the form of the motor 6 (usually also an electric motor). It also includes shown embodiment of the dobby loom still Sensors 7 and 8, each using signal lines a regulation 9 are connected. Regulation 9 in turn is connected to the engine by means of a signal line 6, so connected to the auxiliary drive. Finally is in Fig. 1 still another (additional) drive ZA (Creeper gear) provided, which has a corresponding ZG gearbox can be coupled to the drive train and can be used especially when searching for a shot, either alone (then he has to be dimensioned so that he is able to To drive the dobby alone in the creeper gear) or but together with the engine 6.

In operation, the motor 5 drives the loom 1 and due to the coupling of weaving machine 1 and Dobby 2 also the dobby 2. It can in particular on the part 4 shown Powertrain due to the large oscillating mass components in the weaving machine 1 and Dobby 2 have a very high torque, which becomes the one for the movement of the heald frames required drive torque is added. This in this Area actually adjacent to the drive train Torque is either generated using only one of the two Sensors 7 or 8 or by means of both sensors detected. Whether the torque using only one of the sensors 7,8 or by means of both sensors 7 and 8 depends on how many sensors actually are provided and above all it depends on which one Type of sensor is used. To the different Types of sensors will be discussed in more detail below received. The output signal of sensors 7 and 8 is fed to control 9 by means of signal lines, which in turn the motor 6 via a signal line 10, that is, the auxiliary drive. The control of the Motor 6 through the control 9 takes place so that Fluctuations in between the weaving machine 1 and the Dobby 2 applied torque and / or Fluctuations in the speed can be reduced.

a) Begrenzung des positiven oder negativen Drehmoments auf einen zulässigen Maximalwert

b) Reduktion des Drehmoments um einen konstanten Faktor oder entsprechend einer vorgebbaren mathematischen Gesetzmässigkeit

c) Begrenzung oder Reduktion der Drehmomentveränderung in Funktion der Zeit

d) Sowohl eine Begrenzung des maximal anliegenden Drehmoments als auch zugleich eine Reduktion des Drehmoments

e) Begrenzung des Drehmoments auf einen minimalen, gegen null strebenden Wert.

Different control strategies such as are suitable for regulating the torque

a) Limiting the positive or negative torque to a permissible maximum value

b) Reduction of the torque by a constant factor or according to a predeterminable mathematical law

c) Limiting or reducing the torque change as a function of time

d) Both a limitation of the maximum torque applied and at the same time a reduction of the torque

e) Limiting the torque to a minimum, towards zero value.

For explanation, consider a case where the Weaving machine 1 and the dobby 2 a counter-rotating Strive for movement, which means that one machine an increasing in relation to the increasing angle of rotation Torque, the other machine, however, in terms of torque decreasing the increasing angle of rotation requires (one machine practically braking, the other however, has a driving effect). This calls in clutch 3 and in the between loom 1 and dobby 2 arranged part 4 of the drive train a large Torque. This great torque is from the Sensors 7 and 8 (or, depending on the sensor type, only from one of the two) recorded and in the form of an electrical Signal passed to the control 9. Regulation 9 accordingly controls the auxiliary drive, ie the motor 6, so indicates that this torque will be reduced. This will the drive train is relieved, but so is the main drive, so the motor 5, otherwise this torque alone should apply (if it is designed for this).

However, the solution according to the invention is also regarding of the total energy consumption (this is the one to be used Total power required for the generation of the Torque is required), cheap. This depends causally related to the mechanical coupling. At a dobby loom with mechanically separated Drives for the dobby and the weaving machine, so without connecting elements, the energy would have to Synchronization of the two machines completely from the Drives of the machines are provided (at opposing movement tendencies would have to be Driving motor braking, the other driving act), which with corresponding implementation losses (at the motors). With a mechanical Coupling, however, are the same Movement tendencies at least partially over the mechanical coupling of loom and dobby from (which manifests itself e.g. in a torsion). A Doom loom with mechanical coupling between So loom and dobby is in this case cheaper than a shaft loom without mechanical Coupling.

a) Begrenzung der Drehzahl auf einen zulässigen Maximalwert

b) Begrenzung der Spitzenwerte der Drehzahlveränderung

c) Reduktion der Drehzahlschwankungen auf einen gegen null strebenden Wert.

With regard to the control of the speed, different control strategies are available such as

a) Limiting the speed to a permissible maximum value

b) Limiting the peak values of the speed change

c) Reduction of the fluctuations in the speed to a value that tends towards zero.

As an example, consider a case in which the Weaving machine 1 and dobby 2 are both one Aim for concurrent movement, with both machines one decreasing in relation to the increasing angle of rotation Require torque (that is, they tend toward one higher speed). A corresponding signal is from the sensors 7 and 8 forwarded to the controller 9. The controller 9 then controls the motor 6 so that it has a braking effect on the drive train, otherwise the Speed would increase (and the main drive alone should have a braking effect on the drive train).

Furthermore, consider a case in which the Weaving machine 1 and dobby 2 also one strive for concurrent movement, but in such a way that both machines in terms of increasing angle of rotation require increasing torque (that is, they tend towards a lower speed). On corresponding signal is from sensors 7 and 8 regulation 9 forwarded. Regulation 9 controls then the motor 6 so that it drives the Powertrain works, otherwise the speed will decrease would or the main drive the total drive power would have to muster. But this would be a higher burden of the main drive mean the required Acceleration torque would have to apply alone.

Of course, mixed control strategies are also conceivable, So those strategies where there are fluctuations from case to case of the torque or fluctuations in the speed regulated become. For example, it can be a strategy that a) if the torque is increasing in relation to the Angle of rotation changes in the same direction, i.e. usually Rule one small torque between the weaving machine 1 and the Dobby 2 is present, the speed is controlled b) when the torque with respect to the increasing Angle of rotation changes in opposite directions, i.e. usually Rule one great torque between the weaving machine 1 and the Dobby 2 is present, the torque is regulated, such that the between loom 1 and Dobby 2 arranged part of the drive train 4th and the clutch 3 are relieved. Such Strategy is also about overall efficiency Cheap.

For the detection of the torque between the weaving machine 1 and dobby 2 on the drive train, can on a sensor applied to part 4 of the drive train that includes a strain gauge assembly. On such a sensor is shown in principle in FIG. 2 (greatly enlarged). You can see one there Strain gauge assembly 80, which due to a Torsion of part 4 of the drivetrain by the applied torque is caused from their Rest position 80a is deflected. The rest position 80a is included shown in dashed lines in Fig. 2. The output signal of the Strain gauge assembly 80 is a measure of that Torsion of part 4 of the drive train and the torsion part 4 of the drive train is again a measure of the applied torque. So that's the thing Torque the only variable to be regulated is sufficient in Basically a single such sensor 80. It is of course, that such a sensor 80 too has a suitable transmission element (e.g. a suitable transducer, in Fig. 2 from the drawing Reasons not shown), which in operation the Output signal of the strain gauge arrangement from the rotating drive train to a fixed Transmits machine part.

Another exemplary embodiment, which is shown in FIG is shown, has two sensors, which as Angle encoder 71 and 81 formed and in the longitudinal direction the drive train considered offset from each other are arranged. As part 4 of the Drivetrain due to an applied torque twisted, the angle sensor 71 is out of its rest position 71a, which is indicated by dashed lines, deflected. To the Determining the deflection is of course necessary corresponding detectors along the circumference of the Drive train are arranged. This is shown in Fig. 3 the dashed lines 71b and 81b schematically indicated. The degree of deflection in relation to the Rest position is a measure of the torsion of part 4 of the Powertrain and this in turn is a measure of that applied torque. But angle encoders also have that Advantage that with their help, not only the problem Torque, but also the current speed can be determined.

4, 5 and 6 are finally such Illustrated embodiments in which the applied torque by means of force absorption sensors is recorded, the forces on during operation fixed parts, e.g. on bearings. In Fig. 4, an angular gear 14 is provided, as is e.g. between the weaving machine 1 and the part 4 (FIG. 1) of the drive train can be provided. The two Parts of the drivetrain are only excerpts here indicated, one recognizes an end piece 10 of the Weaving machine 1 coming part of the drive train and a End piece 40 of between loom 1 and dobby 2 provided part 4 of the drive train. The two mutually facing end pieces are in bearings 11 and 41 guided and by means of the bevel gears 12 and 42 mechanically coupled. Now becomes a force or a torque from the bevel gear 12 on the Transfer bevel gear 42, so part 4 of the Want to evade the drivetrain, but is from bearing 41 prevented from doing so. As a result, a corresponding one works Force on the bearing 41, which by a corresponding Force absorption sensor (see Fig. 6) is detected.

5 shows another gear 14a, such as it also between the weaving machine 1 and the part 4 of the drive train can be provided. The two Parts of the drivetrain are only excerpts here indicated, one recognizes an end piece 10a of the Weaving machine 1 coming part of the drive train and a End piece 40a of between loom 1 and Dobby 2 provided part 4 of the drive train. The two end pieces are again in bearings 11a and 41a guided and by means of the radially interlocking Gears 12a and 42a mechanically coupled together. Now a force or a torque from the gear 12a transferred to the gear 42a, so the part 4 of the Want to dodge drivetrain, but from the camp 41a prevented. As a result, one works corresponding force on the bearing 41a, which by a corresponding force absorption sensor (see Fig. 6) is detected, similar to that with reference to FIG. 4 described embodiment.

6 finally shows schematically a sensor 72, which, for example, on bearings 11 and 11a (Fig. 4, Fig. 5) can be provided. As already with reference to Fig. 4 and 5 explains, acts when transmitting a force or a torque on part 4 of the drive train Force on the bearing 41 or 41a, since the drive train in the camp is led and can not evade. Here the forces acting on the bearing 41a can be directed in the direction of arrows F1 and F2 detected by sensor 72 and open this way determines the force or torque be the corresponding force on the bearing caused.

The dobby weaving machine comprises one weaving machine and one Dobby, which has a mechanical Transmission device can be coupled together and in the coupled state, a common drive train have which can be driven by a main drive. she further includes an auxiliary drive that is at least on the the shaft driving part of the drive train is arranged acting. The dobby loom includes Furthermore, at least one sensor that actually on Drive train applied torque recorded and the in Area between the loom and the dobby or in the end area adjacent to this area the weaving machine or the dobby along the Drive train is arranged. This sensor is with a control connected, so the auxiliary drive controls that fluctuations between the weaving machine and the torque applied to the dobby and / or Fluctuations in the speed can be reduced.

Claims (7)

1. Heald loom comprising a weaving machine (1) and a dobby (2) which can be coupled to one another via a mechanical transmission apparatus (3) and have a common drive train in the coupled state which can be driven by a main drive (5), and also comprising an auxiliary drive (6) which is arranged to act at least on the part of the drive train driving the dobby, characterised in that at least one sensor (7, 8) which measures the torque actually present at the drive train is arranged along the drive train in the region between the weaving machine (1) and the dobby (2) or in the end region of the weaving machine (1) or the dobby (2) respectively bordering on this region; and in that this sensor (7, 8) is connected to a control system (9) which actuates the auxiliary drive (6) in such a manner that the torque and/or fluctuations in the speed of rotation present between the weaving machine (1) and the dobby (2) are reduced.
2. Heald loom in accordance with claim 1 characterised in that the sensor (7, 8) or parts thereof is/are arranged on the drive train.
3. Heald loom in accordance with claim 2 characterised in that the sensor comprises a strain gauge arrangement (80) and a suitable transmission element for the transmission of the signal from the drive train to a part of the machine which is fixed during operation.
4. Heald loom in accordance with claim 1 or claim 2 characterised in that at least two sensors are provided which are executed as angle sensors (71, 81) and are arranged to be mutually displaced when viewed in the longitudinal direction of the drive train.
5. Heald loom in accordance with claim 1 characterised in that the sensor is executed as a force pick-up sensor (72) and is arranged in such a manner that it measures, at a part (41, 41a) of the heald loom which is fixed during operation, the reaction forces that are produced by the torque which is present.
6. Heald loom in accordance with one of the claims 1 to 5 characterised in that it has, in addition to the main drive (5) and the auxiliary drive (6), a further drive (ZA) which can be coupled to the part of the drive train driving the dobby.
7. Method for the regulation of a heald loom which comprises a weaving machine (1) and a dobby (2) which can be coupled to one another via a mechanical transmission apparatus (3) and have a common drive train in the coupled state which is driven by a main drive (5) during operation, and which also comprises an auxiliary drive (6) which is arranged to act at least on the part of the drive train driving the dobby, characterised in that the torque actually present at the drive train is measured by at least one sensor (7, 8) which is arranged along the drive train in the region between the weaving machine (1) and the dobby (2), or in the end region of the weaving machine (1) or the dobby (2) respectively bordering on this region, and in that a corresponding signal is supplied to a control system (9) as a result of which the auxiliary drive (6) is actuated in such a manner by the control system (9) that the torque and/or fluctuations in the speed of rotation present between the weaving machine (1) and the dobby (2) are reduced.

Images