EP0544730B1 - Process for controlling a weft thread feed and measurement device - Google Patents

Process for controlling a weft thread feed and measurement device Download PDF

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Publication number
EP0544730B1
EP0544730B1 EP91914777A EP91914777A EP0544730B1 EP 0544730 B1 EP0544730 B1 EP 0544730B1 EP 91914777 A EP91914777 A EP 91914777A EP 91914777 A EP91914777 A EP 91914777A EP 0544730 B1 EP0544730 B1 EP 0544730B1
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EP
European Patent Office
Prior art keywords
release
release time
time
signal
stop element
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Expired - Lifetime
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EP91914777A
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German (de)
French (fr)
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EP0544730A1 (en
Inventor
Pär JOSEFSSON
Joachim Fritzson
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Iro AB
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Iro AB
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
    • D03D47/363—Construction or control of the yarn retaining devices

Definitions

  • the invention relates to a method according to the preamble of patent claim 1 and to a device suitable for carrying out the method according to independent claim 17.
  • the release signal is generated at a specific point in time.
  • the stop device consisting of the stop element and an electro-magnet actuating it, has a release tolerance range that is inevitable in practice, ie the time between the release signal and the actual release can vary depending on external and internal influences.
  • the size of the release tolerance range depends on such variable influences as the contact pressure of the weft thread on the stop element, the movement resistance of the stop element under lateral load and its inertia, the size of the gap for the passage of the take-off point, the quality and the yarn number of the weft thread, the response behavior of the electro magnet and the like.
  • the target release time is a machine and / or thread-specific guideline.
  • the release signal for the stop element is generated depending on the machine cycle by a signal transmitter actuated by the jet weaving machine. Whether due to the inevitable release tolerance range the actual release time then corresponds with a target release time exactly or not is not taken into account.
  • an associated passage sensor in the drum the signals of which are used exclusively for switching on and off a counter for time signals generated by an oscillator, in order to be able to determine the time period for the removal of a complete turn.
  • the stop signal for the stop element is corrected on the time or rotational angle axis on the basis of a current arrival signal of the weft end at the opposite compartment edge.
  • the time or angle of rotation of the stop signal is only corrected in one direction or the other if the time of the current arrival signal roughly corresponds to a predetermined time.
  • the time of the stop signal is corrected as a function of the size of a time or angle difference between the time or angle of the current arrival signal and a predetermined target time.
  • the actual release time of the weft thread is not taken into account in this correction, because only the time or the angle of rotation of the release signal is also determined by a release signal setting device. With this method, the actual movement absorption of the weft thread cannot be taken into account during the insertion.
  • the point in time (angle of rotation) of the stop signal for the actuating magnet of the stop element is shifted forward or backward on the basis of a sync signal from the weaving machine, by the stop signal exactly at a predetermined point in time or angle of rotation adjust.
  • the actual release time of the weft thread is excluded be careful because only the point in time or angle of rotation at which the release signal is generated is determined. The actual release time is neither determined nor corrected.
  • the invention has for its object to provide a method of the type mentioned and a suitable device for performing the method, which works synchronously with the textile machine and manages with an inexpensive electro-magnet for the stop element.
  • the actual release time is set so that one of the next actual release times already matches the target release time.
  • the individual release tolerance range of the stop device is compensated because the actual release time is subsequently adapted to the tolerance range that actually arises during work.
  • An inexpensive electro-magnet can be used, which in itself led to a relatively large release tolerance range, because by adjusting the parameter for the release signal, not only the size of the current tolerance range can be taken into account, but also changes in the tolerance during operation. No expensive pre-fine tuning is necessary for the stop device, because the device is synchronized with the textile machine during operation.
  • the actual release time is determined by scanning.
  • An inexpensive simple magnet can be used for the stop element, because the practical release tolerance range no longer has any noticeable influence. This is also important for repairs, because every available electro magnet that meets the basic requirements can be used in exchange.
  • the device works reliably and with a reasonable amount of control technology, because it uses the clear actual state variables that actually occur in a profitable manner, namely the synchronization signal or the target release time of the textile machine and the actual release of the trigger point to correct the movement of the stop element to control.
  • Claims 2, 3 and 4 are directed to expedient process variants. According to claim 2, it is only necessary to adjust the time of the start of the release signal in order to correctly adjust the actual release time to the desired release time in the tolerance range or the response time of the stop device that is initially to be regarded as constant. According to claim 3, the response of the electro-magnet is accelerated or delayed by regulating the current application at an unchanged time of the release signal. Similarly, the response time of the stop device is lengthened or shortened in claim 4. These aforementioned process variants can also be used in combination with one another if required.
  • the synchronization signal of the textile machine is indeed usually already provided. Its time or the angular position of the signal during a 360 ° cycle is fixed by the textile machine or is set by the machine operator.
  • the synchronization signal is in a constant exact relationship, for example for opening and closing the compartment and thus for the ideal release time or desired angular value for the release of the weft thread, which is ideal for the weaving machine.
  • the weaving machine as it were requests the release of the weft at the target release time. This is taken into account by the approximation.
  • the operating time of the textile machine is understood to mean a period of time over which the textile machine works without changing basic functional parameters.
  • the target release time or target angle value for the release is known, the time or angle distance between the synchronization signal and the target release time or the angle value of the release being fixed.
  • the target release time can either be provided by the textile machine as a signal. However, it can also be set once in the weft delivery and measuring device in relation to the synchronization signal. It is also conceivable to use an intermediate link between the textile machine and the weft thread delivery and measuring device for setting and entering the desired release time.
  • each machine cycle it is also conceivable for each machine cycle to have a synchronization signal and a Generate signal for the target release time.
  • the signal for the target release time could also only be emitted once by the weaving machine (when an operating period has started) and then recorded in the control device of the delivery and measuring device.
  • the target release time for comparison and adjustment is then called up with each synchronization signal.
  • the procedure according to claim 6 is simple in terms of control technology.
  • the matching is carried out automatically. This can be done permanently, but only in the start-up phase, after downtimes or regularly during the operating period in order to relieve the control device or a microprocessor.
  • the embodiment according to claim 9 is expedient, in which the method is based on the first pass signal.
  • a distance between the stop element and the continuity sensor can already be taken into account when determining the target release time.
  • the actual release time can also be determined by a constant for the continuity signal or by back calculation based on the thread speed.
  • the method variant according to claim 11 is also simple, in which the actual release time is determined by active scanning.
  • the actual release time can be determined very precisely with one scan.
  • the method according to the invention also takes into account the experience that the release tolerance of the stop device does not change abruptly from one entry to the other, but that changes occur gradually.
  • the measure of adjusting the release signal time or an actuation parameter for the next entry or for one of the next entry processes a very precise adjustment is achieved. Significant changes can occur, for example, after changing the weft delivery and measuring device to a new weft length. However, this is taken into account by the adjustment made immediately after the start of operations.
  • the continuity signal could be used to determine the respective actual release time, in which the control device assigns an individual constant to each stop device, which depends on the angular distance between the stop device and the continuity sensor.
  • the constants are then stored in a kind of table and are called up accordingly when the stop device is actuated.
  • the advantage of inexpensive electromagnets is particularly significant since up to 24 stop devices can be distributed along the storage area.
  • the device according to claim 18 can be determined with the first pass signal at or shortly after the release of the actual release time precisely enough.
  • the difference between the actual release time and the target release time is a meaningful guide value for the extent and direction of the adjustment or change of the parameter for the release signal, so that the actual release time for or with a subsequent entry is exactly or almost exactly in the target To have release time. If the actual release time is after the target release time, then the time for the release signal is advanced or the response time is shortened. If, on the other hand, the actual release time is earlier than the target release time, then the time for the release signal is adjusted accordingly or the response time is extended. The release is thus synchronized with the textile machine with sufficient accuracy.
  • the supply current control circuit changes the function of a determined deviation between the actual release time and the target release time Energy applied to the electro-magnet, e.g. by changing the current, modulating the release signal or by means of similar electronic influences in order to lengthen or shorten the time between the start of the release signal and the actual release time. In practice, this could be done in a simple manner by changing the pull-in current for the electromagnet, while the holding current of the electromagnet is not changed.
  • the embodiment according to claim 20 is also favorable.
  • the continuity sensor finds the actual release time most accurate if it is at the circumferential position of the stop element. But also in a position of the passage sensor lying behind the stop element in the circumferential direction of the withdrawal point, a passage signal meaningful for the determination of the actual release time is generated. It is expedient for the distance between the stop element and the passage sensor to be as small as possible, but not too small, so that a clear passage signal is produced.
  • the embodiment according to claim 21 is particularly important because it produces manufacturing, setting and assembly-related advantages if the sensors and the stop device are accommodated in one and the same structural unit.
  • a further advantageous embodiment is set out in claim 22.
  • the evaluation circuit of the detection device determines the actual release time by means of the release significant change in course, eg an indentation in the course. This indentation occurs depending on the response of the stop element and the magnet when the armature is about to reach its end position and the stop element releases the trigger point.
  • This is a principle that can also be used for devices with several circumferentially distributed stop devices and a drum with a fixed diameter.
  • the embodiment of claim 25 is favorable.
  • the significant position does not necessarily have to be the fully retracted position of the stop element, but the position at which the trigger point is most likely to be released.
  • the position sensor must therefore be precisely adjusted to the respective conditions, e.g. on the thread quality or thread thickness and the gap width.
  • the embodiment according to claim 26 is also important, in which the target release time is defined either as a time on the time axis or as an angular position on a 360 ° circular arc.
  • a weft delivery and measuring device V is used to store a continuously formed, consisting of turns supply T of a weft F, which is provided for a textile machine, for example a jet weaving machine, and is used periodically in precisely dimensioned longitudinal sections.
  • the device V contains in a housing 1 a drive motor M for a winding member for the thread F consisting of a hollow shaft 3 and a tube 4 projecting obliquely therefrom, which is fed to one end of the device and wound up by the winding member 4 onto a drum-shaped storage surface 5 , which consists of individual, radially adjustable fingers 6.
  • To adjust the Finger 6 serves an adjusting disc 7.
  • the storage surface 5 is rotatably supported with bearings 10 on the extended end of the hollow shaft 3 and is prevented from rotating by magnets 9.
  • a unit B is attached to the housing 1, which extends over a limited circumferential area of the storage area 5 and, with it, delimits a gap P through which the thread F can be drawn off with a take-off point running
  • the structural unit B contains a stop device A, consisting of a stop element 11 and an electro-magnet 12, which can move back and forth radially between a stop position crossing the gap P and a release position pulled out of the gap P. Furthermore, it contains a reference sensor R and a passage sensor D.
  • the reference sensor R is located in the circumferential direction (indicated by an arrow) of the trigger point in front of the stop element 11, the passage sensor D in the circumferential direction, however, just behind the stop element 11.
  • the passage sensor D could also be arranged separately from the unit B, and expediently in an area which extends in the circumferential direction from the stop element 11 to at most the diametrically opposite position.
  • the passage sensor D could also be arranged in the same circumferential position as the stop element 11.
  • the structural unit B can be adjusted in the radial direction by means of a detachably fastened holder 13, so that the gap P is maintained depending on the radial position of the fingers 6.
  • control devices C, C1 are with the sensors R, D and the electromagnet 12 in a signal-transmitting connection. Furthermore, the control devices C, C1 are connected to the textile machine, not shown, in such a way that they are supplied at least with synchronization signals which are dependent on the cycle of the textile machine, and, if appropriate, once or permanently with a signal which determines the target release time. At this point in time, the weaving machine asks for the release of the weft thread, so to speak, as a cycle. The withdrawal speed of the thread F and other important parameters can be entered in C, C1. In the control devices C, C1 at least one microprocessor with memory is expediently provided. In addition, a keyboard or a connection for a controller can be provided for setting function parameters.
  • the winding member 4 keeps the stock at a predetermined size and monitored by the reference sensor R.
  • the thread take-off point is prevented from rotating around by the stop element 11 standing in the stop position.
  • the thread F extends from the stop element 11 to a thread eyelet (not shown) which is concentric with the hollow shaft 3 or directly to an insertion nozzle for a jet loom.
  • a synchronization signal is obtained from the textile machine. whereupon the stop element 11 is moved into its release position by the electro-magnet 12 and the thread F is drawn off with the circumferential take-off point.
  • a passage signal is generated and transmitted to the star devices.
  • the control devices C, C1 break off the release signal for the electro-magnet 12 before reaching the predetermined weft thread length, so that the withdrawal point is intercepted by the stop element 11 at the right moment. Since only one stop device B is provided, the weft thread length is set beforehand by means of the radially adjustable fingers 6 in such a way that one turn in the supply R corresponds to an integral fraction of the weft thread length.
  • the first continuity signal of the continuity sensor D is used to determine the actual release time.
  • the distance Q between the stop element 11 and the passage sensor D is known.
  • the thread take-off speed V or also as determined by empirical tests a certain time elapses between the current time of release of the thread F at the stop element 11 and the passage of the thread F under the passage sensor D.
  • the actual release time is calculated back on the basis of the first continuity signal in the control device C 1 or determined by means of a constant. If the distance Q is short, it may be ignored because it is irrelevant to the accuracy of the method.
  • the control device C 1 compares whether the actual release time lagging or leading relative to the target release time and how large the deviation is. As soon as the deviation is determined, the mentioned parameter, e.g. the time for the start of the release signal for the electromagnet 12 is adjusted accordingly, so that the actual release time coincides with the desired release time in the case of a subsequent entry.
  • FIG. 3 shows synchronization signals S1, S2, S3 from on the horizontal axis I (time axis or angular axis) the textile machine at predetermined time or angular intervals.
  • the angular distance is 360 °, for example.
  • Each synchronization signal follows with a predetermined distance a a target release point SS1, SS2, SS3.
  • Activation signals E1, E2, E3 generated for an entry nozzle (not shown) of the textile machine are indicated on axis II.
  • the entry nozzle is activated with the leading edge of the signal E1, E2, E3; it is deactivated with the rear flank.
  • the enable signals G1, G2, G3 for the electromagnet 12 are indicated on the horizontal axis III.
  • each signal G1, G2, G3 With the leading edge of each signal G1, G2, G3, the electro-magnet 12 is actuated to move the stop element 11 into the release position.
  • the electromagnet 12 is de-energized with the trailing edge of each signal G1, G2, G3.
  • the movements of the stop element 11 band of the curves N1, N2, N3 are indicated on the axis VI.
  • the stop element 11 arrives in the release position (upper limit line) with a delay in response and returns to the stop position (axis VI) with a delay.
  • the actual release times K1, K2, K3 are shown on axis IV.
  • the actual release time K1 deviates by an amount X from the target release time SS1.
  • the next release signal G2 is therefore adjusted approximately by the dimension X 'in the direction of an arrow.
  • the signal G2 is generated relative to the target release time SS2 a little later than at the target release time SS1.
  • the actual release time K2 is again determined, which deviates from the target release time SS2 by a measure Y.
  • the time for the next release signal G3 is then adjusted by approximately the dimension Y 'in the direction of the arrow.
  • the signal G3 somewhat earlier - based on the target release time SS3 - generated than at the target release time SS2.
  • the actual release time K3 then determined agrees with the target release time SS3.
  • the release signal is then no longer adjusted as long as the actual release time continues to coincide with the target release time.
  • the continuity signals L generated by the continuity sensor D are plotted on the axis V.
  • the signals L have the same spacing from one another. Their number per cycle represents the weft length. The distance between the respective target release time SS1, SS2, SS3 and the leading edge of the first pass signal L varies accordingly due to the adjustment of the release signals G1, G2, G3.
  • the actual release time is determined by direct scanning.
  • the passage sensor D is arranged at the same circumferential position as the stop element 11. It generates the first continuity signal as soon as the trigger point starts moving.
  • an optoelectronic position sensor is provided as a detection device I for the stop element 11, which generates a signal when it moves into the release position at a position of the stop element 11 that is significant for the release of the trigger point.
  • This signal could also be generated with an inductive sensor.
  • the time of occurrence of the signal is the actual release time.
  • a motion detector for the longitudinal movement of the thread is provided as the detection device I, which, e.g. is formed by a thread eyelet 15 with a piezoelectric sensor 16.
  • This motion detector can be arranged in the thread path from the storage area 5 to the textile machine at any suitable position.
  • the solid curve 17 represents the course of the signal when the stop element 11 moves.
  • the curve 17 shows a clear indentation 18.
  • the time of this indentation 18 represents the actual release time K1, Kn, K3. If the course is delayed as in the dashed curve 17 ', the indentation 18' occurs at a later point in time.
  • the difference between the curves 17, 17 'could also be generated consciously on the control side, for example by changing the current applied to the electromagnet, so that the actual release time for adjustment to the target release time can be adjusted for the start or the start signal of the release signal to postpone.
  • the textile machine 20 for example a jet weaving machine, is equipped with an operating panel 21 which is connected to a control device 22 of the Textile machine is connected.
  • the panel 21 has, for example, input keys and a display.
  • the star device 22 controls the active and passive components of the textile machine, not shown, as a function of input and already stored data.
  • From the control device 22 lead two signal lines 23, 24 to the control devices C, C1 of the weft delivery and measuring device V.
  • the target release time in the form of a signal related to the machine cycle to the star devices C. , C1 transmitted.
  • the signal line 24 is used to transmit the synchronization signal.
  • a comparator circuit 27 and a subsequent adjustment circuit 29 via a line 28 are provided in the control devices C, C1, which contain a microprocessor, not shown, with memory devices.
  • a release sensor 25 is connected to the input of the comparator circuit 27 via a line 26 which transmits the actual release time signals, e.g. the continuity sensor D or the detection device I.
  • the electro-magnet 12 of the stop element 11 is connected to the output of the adjustment circuit 29 via a line 30 which transmits the release signal. If the target release time signal is generated only once, a memory is provided for this purpose, from which the comparator circuit 27 retrieves the target release time each time a synchronization signal is received. In the other case, the target release time is in any case once for each cycle.
  • a variant is shown in the block diagram according to FIG. 10 of the control-side components for aligning the actual release time with the target release time.
  • a microprocessor 30 with memory devices, not shown, is included, which receives at least once the signal for the target release time from line 23.
  • the release sensor 25, ie the passage sensor D or the detection device I is connected to the microprocessor 30.
  • the signals representing the actual release time are transmitted via the signal line 31.
  • the microprocessor 30 is connected to a driver circuit 34 for the electromagnet 12 via two lines 32, 33.
  • a power supply line 35 is connected to the driver circuit 34.
  • the release signal is transmitted on line 32, while control signals for the current transmitted from driver circuit 34 to electromagnet 12 are provided via line 33.
  • the release signal current is then transmitted via line 36 to the magnet 12, which in turn moves the stop element.
  • the microprocessor 30 emits the release signal at the same time in each case in one machine cycle.
  • the microprocessor 30 also determines the comparison between the actual release time and the target release time. If a deviation is found, the microprocessor 30 changes, for example, the current control signal on the line 33 in order to adapt the actual release time for a subsequent entry to the desired release time.
  • the electromagnet 12 with the release signal is initially supplied with a high starting current and after a predetermined period of time with a lower holding current. By changing the starting current, the response time of the system consisting of the electromagnet and the stop element can be shortened or extended. In this way, the microprocessor 30 controls the adjustment of the actual release time to the target release time by, for example, correspondingly changing the starting current for the release signal on line 32.

Abstract

In a process for controlling a weft thread feed and measurement device for an air jet loom, a release signal is generated for a weft thread insertion, whereupon a stop element is moved into a release position and releases the weft thread at an actual release time. The actual release time is recorded at the moment of insertion and compared with a reference release time which depends on the textile machine. A parameter for the release signal which influences the actual release time is then adjusted in function of the difference detected between the actual release time and the reference release time in such a manner that on the next insertion the actual release time is approximately equal to the reference release time. A suitable device for carrying out the process has a passage sensor or a detection device (I) for determining the actual release time and a comparison and equalization circuit for comparing and adjusting a parameter for the release signal which influences the actual release time.

Description

Die Erfindung betrifft ein Verfahren gemäß dem Oberbegriff des Patentanspruchs 1 sowie eine zum Durchführen des Verfahrens geeignete Vorrichtung gemäß nebengeordnetem Anspruch 17.The invention relates to a method according to the preamble of patent claim 1 and to a device suitable for carrying out the method according to independent claim 17.

Bei einer unter der Bezeichnung IWF 8407 bzw. Comet bekannten Schußfadenliefer- und -meßvorrichtung der Fa. IRO AB wird das Freigabesignal an einem bestimmten Zeitpunkt erzeugt. Die Stopvorrichtung, bestehend aus dem Stopelement und einem dieses betätigenden Elektro-Magneten, besitzt einen in der Praxis unvermeidbaren Freigabe-Toleranzbereich, d.h. die Zeit zwischen dem Freigabesignal und der Ist-Freigabe kann in Abhängigkeit von äußeren und inneren Einflüssen variieren. Die Größe des Freigabetoleranzbereichs hängt, dabei von solchen variablen Einflüssen wie dem Anlagedruck des Schußfadens am Stopelement, dem Bewegungswiderstand des Stopelementes unter seitlicher Belastung und seiner Massenträgheit, der Größe des Spaltes für den Durchgang der Abzugsstelle, der Qualität und der Garnnummer des Schußfadens, dem Ansprechverhalten des Elektro-Magneten und dgl. ab. Für die Textilmaschine gibt es bei jedem Betriebsfall einen Soll-Freigabezeitpunkt, an dem der Schußfaden seine Bewegung aufnehmen sollte, damit die Textilmaschine optimal arbeiten kann. Der Soll-Freigabezeitpunkt ist ein maschinen- und/oder fadenspezifischer Richtwert.In the case of a weft thread delivery and measuring device from IRO AB known under the name IWF 8407 or Comet, the release signal is generated at a specific point in time. The stop device, consisting of the stop element and an electro-magnet actuating it, has a release tolerance range that is inevitable in practice, ie the time between the release signal and the actual release can vary depending on external and internal influences. The size of the release tolerance range depends on such variable influences as the contact pressure of the weft thread on the stop element, the movement resistance of the stop element under lateral load and its inertia, the size of the gap for the passage of the take-off point, the quality and the yarn number of the weft thread, the response behavior of the electro magnet and the like. For each textile machine there is a target release time at which the weft thread should start its movement so that the textile machine can work optimally. The target release time is a machine and / or thread-specific guideline.

Gerade bei modernen Düsenwebmaschinen mit bis zu 1500 Eintragvorgängen pro Minute ist es wichtig, daß die den Schußfaden messende und liefernde Vorrichtung so exakt wie möglich synchron mit der Düsenwebmaschine arbeitet. Die Freigabe des Schußfadens sollte jeweils möglichst genau am Soll-Freigabezeitpunkt stattfinden, wobei Abweichungen allenfalls bis zu ca. 3° eines Zyklusses tolerierbar sind. Die Hersteller der Düsenwebmaschinen fordern demzufolge eine hohe Synchronisationsgenauigkeit, um zwischen dem Öffnen und Schließen des Webfaches nicht durch ungenaues Ansprechen der Schußfadenliefer- und -meßvorrichtung eingeschränkt zu sein. Bei dem Toleranzbereich üblicher Stopvorrichtungen kann diese Forderung nicht zufriedenstellend erfüllt werden. Bei der bekannten Vorrichtung mit einer Stopvorrichtung und einem Durchgangssensor und radial verstellbarer Speicherfläche wird ein hochwertiger, teurer und in Versuchen ausgewählter Elektro-Magnet für das Stopelement verwendet und wird die Stopvorrichtung mit hohem Fertigungsaufwand exakt abgestimmt, um einen möglichst engen Freigabetoleranzbereich zu erhalten, der einmal auf den Soll-Freigabezeitpunkt eingestellt wird. Dies ist kostenintensiv und zeitaufwendig.Especially in modern jet weaving machines with up to 1500 insertion processes per minute, it is important that the device measuring and delivering the weft thread works as precisely as possible in synchronism with the jet weaving machine. The release of the weft thread should take place as precisely as possible at the target release time, with deviations at most of up to approx. 3 ° of a cycle being tolerable. The manufacturers of the jet weaving machines therefore require a high degree of synchronization accuracy, so as not to be restricted by the inaccurate response of the weft thread delivery and measuring device between the opening and closing of the shed. With the tolerance range of conventional stop devices, this requirement cannot be met satisfactorily. In the known device with a stop device and a passage sensor and radially adjustable storage area, a high-quality, expensive and experimentally selected electro-magnet is used for the stop element and the stop device is precisely matched with a high manufacturing effort in order to obtain the narrowest possible release tolerance range that once is set to the target release time. This is costly and time consuming.

Bei einer aus der EP-A2-01 12 555 bekannten Schußfadenliefer- und -meßvorrichtung wird das Freigabesignal für das Stopelement maschinentaktabhängig von einem von der Düsenwebmaschine betätigten Signalgeber erzeugt. Ob wegen des unvermeidlichen Freigabe-Toleranzbereiches der Ist-Freigabezeitpunkt dann mit einem Soll-Freigabezeitpunkt genau genug übereinstimmt oder nicht wird nicht berücksichtigt. In derselben Umfangsposition wie das Stopelement an der Trommel befindet sich ein zugeordneter Durchgangssensor, dessen Signale ausschließlich zum Ein- und Ausschalten eines Zählers für von einem Oszillator erzeugte Zeitsignale benutzt werden, um die Zeitdauer für den Abzug einer vollständigen Windung ermitteln zu können.In a weft thread delivery and measuring device known from EP-A2-01 12 555, the release signal for the stop element is generated depending on the machine cycle by a signal transmitter actuated by the jet weaving machine. Whether due to the inevitable release tolerance range the actual release time then corresponds with a target release time exactly or not is not taken into account. In the same circumferential position as the stop element on the There is an associated passage sensor in the drum, the signals of which are used exclusively for switching on and off a counter for time signals generated by an oscillator, in order to be able to determine the time period for the removal of a complete turn.

Bei einem aus EP-A-0 228 089 bekannten Verfahren wird das Stopsignal für das Stopelement auf der Basis eines aktuellen Ankunftssignals des Schußfadenendes am gegenüberliegenden Fachrand auf der Zeit- oder Drehwinkelachse korrigiert. Der Zeitpunkt bzw. Drehwinkel des Stopsignals wird jedoch nur dann in der einen oder anderen Richtung korrigiert, wenn der Zeitpunkt des aktuellen Ankunftssignals in etwa mit einem vorgegebenen Zeitpunkt übereinstimmt. Mit anderen Worten erfolgt die Korrektur des Zeitpunkts des Stopsignals in Abhängigkeit von der Größe einer Zeitoder Winkeldifferenz zwischen dem Zeitpunkt oder Winkel des aktuellen Ankunftssignals und einem vorgegebenen Sollzeitpunkt. Der Ist-Freigabezeitpunkt des Schußfadens bleibt bei dieser Korrektur außer Betracht, denn es wird nur der Zeitpunkt bzw. der Drehwinkel des Freigabesignals auch eine Freigabesignal-Einstellvorrichtung bestimmt. Bei diesem Verfahren läßt sich die tatsächliche Bewegungsaufnahme des Schußfadens beim Eintragen nicht berücksichtigen.In a method known from EP-A-0 228 089, the stop signal for the stop element is corrected on the time or rotational angle axis on the basis of a current arrival signal of the weft end at the opposite compartment edge. However, the time or angle of rotation of the stop signal is only corrected in one direction or the other if the time of the current arrival signal roughly corresponds to a predetermined time. In other words, the time of the stop signal is corrected as a function of the size of a time or angle difference between the time or angle of the current arrival signal and a predetermined target time. The actual release time of the weft thread is not taken into account in this correction, because only the time or the angle of rotation of the release signal is also determined by a release signal setting device. With this method, the actual movement absorption of the weft thread cannot be taken into account during the insertion.

Bei einem aus EP-A-0 196 676 bekannten Verfahren wird der Zeitpunkt (Drehwinkel) des Stopsignals für den Betätigungsmagneten des Stopelements auf der Basis eines Sync-Signals der Webmaschine vorwärts oder rückwärts verschoben, um das Stopsignal genau auf einen vorbestimmten Zeitpunkt bzw. Drehwinkel einzustellen. Der Ist-Freigabezeitpunkt des Schußfadens wird außer acht gelassen, weil nur der Zeitpunkt bzw. Drehwinkel festgelegt wird, an bzw. bei dem das Freigabesignal erzeugt wird. Der Ist-Freigabezeitpunkt wird weder ermittelt noch korrigiert.In a method known from EP-A-0 196 676, the point in time (angle of rotation) of the stop signal for the actuating magnet of the stop element is shifted forward or backward on the basis of a sync signal from the weaving machine, by the stop signal exactly at a predetermined point in time or angle of rotation adjust. The actual release time of the weft thread is excluded be careful because only the point in time or angle of rotation at which the release signal is generated is determined. The actual release time is neither determined nor corrected.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art sowie eine zum Durchführen des Verfahrens geeignete Vorrichtung anzugeben, die synchron mit der Textilmaschine arbeitet und mit einem preiswerten Elektro-Magenten für das Stopelement auskommt.The invention has for its object to provide a method of the type mentioned and a suitable device for performing the method, which works synchronously with the textile machine and manages with an inexpensive electro-magnet for the stop element.

Die gestellte Aufgabe wird mit den aus dem Verfahrensanspruch 1 und im nebengeordneten Anspruch 17 entnehmbaren Merkmalen gelöst.The stated object is achieved with the features that can be inferred from method claim 1 and in subordinate claim 17.

Der Ist-Freigabezeitpunkt wird bei einer unzulässigen Abweichung zur Synchronisation der Schußfadenliefer- und -meßvorrichtung auf die Textilmaschine so eingestellt, daß bereits einer der nächsten Ist-Freigabezeitpunkte mit dem Soll-Freigabezeitpunkt übereinstimmt. Der individuelle Freigabetoleranzbereich der Stopvorrichtung wird kompensiert, weil der Ist-Freigabezeitpunkt nachträglich an den sich beim Arbeiten tatsächlich einstellenden Toleranzbereich angepaßt wird. Es läßt sich ein preiswerter Elektro-Magnet verwenden, der an Sich zu einem relativ großen Freigabetoleranzbereich führte, denn durch die Verstellung des Parameters für das Freigabesignal werden nicht nur die Größe des aktuellen Toleranzbereiches berücksichtigbar, sondern auch Veränderungen der Toleranz im Betrieb. Für die Stopvorrichtung ist keine teure Vorabfeinabstimmung mehr nötig, weil die Vorrichtung während des Betriebes mit der Textilmaschine synchronisiert wird.In the event of an impermissible deviation for the synchronization of the weft thread delivery and measuring device on the textile machine, the actual release time is set so that one of the next actual release times already matches the target release time. The individual release tolerance range of the stop device is compensated because the actual release time is subsequently adapted to the tolerance range that actually arises during work. An inexpensive electro-magnet can be used, which in itself led to a relatively large release tolerance range, because by adjusting the parameter for the release signal, not only the size of the current tolerance range can be taken into account, but also changes in the tolerance during operation. No expensive pre-fine tuning is necessary for the stop device, because the device is synchronized with the textile machine during operation.

In der Vorrichtung gemäß Anspruch 17 wird der Ist-Freigabezeitpunkt durch Abtasten ermittelt. Es kann ein kostengünstiger einfacher Magnet für das Stopelement verwendet werden, weil der sich in der Praxis ergebende Freigabetoleranzbereich keinen spürbaren Einfluß mehr hat. Dies ist wichtig auch für Reparaturen, weil jeder die grundsätzlichen Anforderungen erfüllende erhältliche Elektro-Magnet im Austausch benutzbar ist. Die Vorrichtung arbeitet zuverlässig und mit vertretbarem steuerungstechnischen Aufwand, weil sie sich in gewinnbringender Weise tatsächlich auftretender, klarer Ist-Zustandsgrößen bedient, nämlich des Synchronisationssignals bzw. des Soll-Freigabezeitpunkts der Textilmaschine und der Ist-Freigabe der Abzugsstelle, um die Bewegung des Stopelements korrekt zu steuern.In the device according to claim 17, the actual release time is determined by scanning. An inexpensive simple magnet can be used for the stop element, because the practical release tolerance range no longer has any noticeable influence. This is also important for repairs, because every available electro magnet that meets the basic requirements can be used in exchange. The device works reliably and with a reasonable amount of control technology, because it uses the clear actual state variables that actually occur in a profitable manner, namely the synchronization signal or the target release time of the textile machine and the actual release of the trigger point to correct the movement of the stop element to control.

Die Ansprüche 2, 3 und 4 sind auf zweckmäßige Verfahrensvarianten gerichtet. Gemäß Anspruch 2 bedarf es nur der Verstellung des Zeitpunktes des Beginns des Freigabesignals, um bei dem zunächst als konstant anzusehenden Toleranzbereich bzw. der Ansprechzeit der Stopvorrichtung den Ist-Freigabezeitpunkt korrekt an den Soll-Freigabezeitpunkt anzugleichen. Gemäß Anspruch 3 wird durch Regeln der Strombeaufschlagung bei unverändertem Zeitpunkt des Freigabesignals das Ansprechen des Elektro-Magenten beschleunigt oder verzögert. Ähnlich wird bei Anspruch 4 die Ansprechdauer der Stopvorrichtung verlängert oder verkürzt. Diese vorerwähnten Verfahrensvarianten können bei Bedarf auch miteinander kombiniert eingesetzt werden.Claims 2, 3 and 4 are directed to expedient process variants. According to claim 2, it is only necessary to adjust the time of the start of the release signal in order to correctly adjust the actual release time to the desired release time in the tolerance range or the response time of the stop device that is initially to be regarded as constant. According to claim 3, the response of the electro-magnet is accelerated or delayed by regulating the current application at an unchanged time of the release signal. Similarly, the response time of the stop device is lengthened or shortened in claim 4. These aforementioned process variants can also be used in combination with one another if required.

Das Synchronisationssignal der Textilmaschine wird zwar üblicherweise schon bereitgestellt. Sein Zeitpunkt bzw. die Winkelposition des Signals während eines 360°-Zyklusses liegt durch die Textilmaschine fest bzw. wird durch den Maschinenführer eingestellt. Das Sychronisationssignal steht in gleichbleibender exakter Relation z.B. zum Öffnen und Schließen des Fachs und damit zu dem für die Webmaschine idealen Soll-Freigabezeitpunkt bzw. Soll-Winkelwert der Freigabe des Schußfadens. Die Webmaschine verlangt sozusagen die Freigabe des Schußfadens zum Soll-Freigabezeitpunkt. Dem wird durch die Angleichung Rechnung getragen.The synchronization signal of the textile machine is indeed usually already provided. Its time or the angular position of the signal during a 360 ° cycle is fixed by the textile machine or is set by the machine operator. The synchronization signal is in a constant exact relationship, for example for opening and closing the compartment and thus for the ideal release time or desired angular value for the release of the weft thread, which is ideal for the weaving machine. The weaving machine as it were requests the release of the weft at the target release time. This is taken into account by the approximation.

Selbst wenn durch sich ändernde Einflüsse der Ist-Freigabezeitpunkt variieren sollte, wird bei der Verfahrensvariante gemäß Anspruch 5 rasch eine exakte Angleichung an den Soll-Freigabezeitpunkt gewährleistet. Unter der Betriebsdauer der Textilmaschine wird dabei ein Zeitraum verstanden, über den die Textilmaschine ohne Änderung grundlegender Funktionsparameter arbeitet. In der Schußfadenliefer- und -meßvorrichtung ist der Soll-Freigabezeitpunkt bzw. Soll-Winkelwert für die Freigabe bekannt, wobei der Zeit- oder Winkelabstand zwischen dem Synchronisationssignal und dem Soll-Freigabezeitpunkt bzw. dem Winkelwert der Freigabe festbleibend ist. Der Soll-Freigabezeitpunkt kann entweder von der Textilmaschine als Signal bereitgestellt werden. Er kann aber auch in der Schußfadenliefer- und -meßvorrichtung einmal in bezug auf das Synchronisationssignal festgelegt werden. Es ist auch denkbar, zwischen der Textilmaschine und der Schußfadenliefer- und -meßvorrichtung ein Zwischenglied zum Festlegen und Engeben des Soll-Freigabezeitpunkts zu verwenden. Es ist ferner denkbar, bei jedem Maschinenzyklus ein Synchronisationssignal und ein Signal für den Soll-Freigabezeitpunkt zu erzeugen. Das Signal für den Soll-Freigabezeitpunkt könnte auch von der Webmaschine nur einmal (beim Anlaufen einer Betriebsdauer) abgegeben und dann in der Steuervorrichtung der Liefer- und Meßvorrichtung festgehalten werden. Mit jedem Synchronisationssignal wird dann der Soll-Freigabezeitpunkt zum Vergleichen und zum Angleichen abgerufen. Steuerungstechnisch einfach ist dabei die Vorgangsweise gemäß Anspruch 6.Even if the actual release time should vary due to changing influences, an exact adjustment to the desired release time is quickly ensured with the method variant according to claim 5. The operating time of the textile machine is understood to mean a period of time over which the textile machine works without changing basic functional parameters. In the weft delivery and measuring device, the target release time or target angle value for the release is known, the time or angle distance between the synchronization signal and the target release time or the angle value of the release being fixed. The target release time can either be provided by the textile machine as a signal. However, it can also be set once in the weft delivery and measuring device in relation to the synchronization signal. It is also conceivable to use an intermediate link between the textile machine and the weft thread delivery and measuring device for setting and entering the desired release time. It is also conceivable for each machine cycle to have a synchronization signal and a Generate signal for the target release time. The signal for the target release time could also only be emitted once by the weaving machine (when an operating period has started) and then recorded in the control device of the delivery and measuring device. The target release time for comparison and adjustment is then called up with each synchronization signal. The procedure according to claim 6 is simple in terms of control technology.

Bei der Verfahrensvariante gemäß Anspruch 7 wird permanent eine exakte Angleichung gewährleistet. Variationen des Toleranzbereiches treten allerdings relativ langsam ein, so daß sich das System an die Variationen leicht anzupassen vermag.In the method variant according to claim 7, an exact adjustment is permanently guaranteed. Variations in the tolerance range occur relatively slowly, however, so that the system can easily adapt to the variations.

Gemäß Anspruch 8 wird das Angleichen automatisch durchgeführt. Das kann permanent, aber auch nur in der Anlaufphase, nach Stillstandszeiten oder regelmäßig während der Betriebsdauer erfolgen, um die Steuervorrichtung oder einen Mikroprozessor zu entlasten.According to claim 8, the matching is carried out automatically. This can be done permanently, but only in the start-up phase, after downtimes or regularly during the operating period in order to relieve the control device or a microprocessor.

Zweckmäßig ist die Ausführungsform gemäß Anspruch 9, bei der sich das Verfahren nach dem ersten Durchgangssignal richtet. Ein Abstand zwischen dem Stopelement und dem Durchgangssensor kann schon bei der Festlegung des Soll-Freigabezeitpunkts berücksichtigt werden.The embodiment according to claim 9 is expedient, in which the method is based on the first pass signal. A distance between the stop element and the continuity sensor can already be taken into account when determining the target release time.

Der Ist-Freigabezeitpunkt kann ferner durch eine Konstante für das Durchgangssignal oder durch Rückrechnen auf der Basis der Fadengeschwindigkeit festgestellt werden, entsprechend Anspruch 10.The actual release time can also be determined by a constant for the continuity signal or by back calculation based on the thread speed.

Einfach ist ferner die Verfahrensvariante gemäß Anspruch 11, bei der der Ist-Freigabezeitpunkt durch aktives Abtasten ermittelt wird. Mit einer Abtastung kann der Ist-Freigabezeitpunkt nämlich sehr genau ermittelt werden.The method variant according to claim 11 is also simple, in which the actual release time is determined by active scanning. The actual release time can be determined very precisely with one scan.

Zweckmäßige Verfahren zum Abtasten gehen aus den Ansprüchen 12, 13 und 14 hervor. Bei piezo-elektrischer, opto-elektronischer, kapazitiver oder induktiver Abtastung des Schußfadens bzw. des Stopelementes wird genau der Ist-Zeitpunkt festgestellt, an dem die Abzugsstelle ihre Bewegung aufnimmt. Durch eine Überwachung des Verlaufs des Signals für den Elektro-Magneten anhand der elektromotorischen Kraft wird eine ausreichend genaue Aussage für den Ist-Freigabezeitpunkt gefunden. Im Verlauf des Signals des Elektro-Magneten tritt bei der Freigabestellung des Stopelementes eine Einbuchtung auf, die Sich gut abtasten läßt.Appropriate methods for scanning are evident from claims 12, 13 and 14. In the case of piezoelectric, optoelectronic, capacitive or inductive scanning of the weft thread or the stop element, the actual point in time at which the trigger point starts its movement is ascertained. By monitoring the course of the signal for the electromagnet based on the electromotive force, a sufficiently precise statement is found for the actual release time. In the course of the signal from the electro-magnet, when the stop element is in the release position, an indentation occurs which can be easily sensed.

Das erfindungsgemäße Verfahren berücksichtigt auch die Erfahrung, daß sich die Freigabetoleranz der Stopvorrichtung nicht sprunghaft von einem Eintrag zum anderen ändert, sondern daß Änderungen allmählich auftreten. Mit der Maßnahme, den Freigabesignalzeitpunkt oder einen Betätigungsparameter jeweils für den nächsten Eintrag oder für einen der nächsten Eintragvorgänge zu verstellen, wird eine sehr präzise Angleichung erreicht. Signifikante Änderungen können z.B. nach einer Umstellung der Schußfaden-Liefer- und -meßvorrichtung auf eine neue Schußfadenlänge auftreten. Dem wird aber durch die dann sofort vorgenommene Angleichung nach Betriebsaufnahme Rechnung getragen.The method according to the invention also takes into account the experience that the release tolerance of the stop device does not change abruptly from one entry to the other, but that changes occur gradually. With the measure of adjusting the release signal time or an actuation parameter for the next entry or for one of the next entry processes, a very precise adjustment is achieved. Significant changes can occur, for example, after changing the weft delivery and measuring device to a new weft length. However, this is taken into account by the adjustment made immediately after the start of operations.

Für die Praxis wichtige Vorgangsweisen gehen aus den Ansprüchen 15 und 16 hervor. Je nach Anwender, Maschinenhersteller oder Konzeption der Steuervorrichtungen wird entweder das Prinzip vorgezogen, die Zeitpunkte auf einer Zeitachse und die Abstände zwischen den Zeitpunkten als Zeitabstände zu verarbeiten, oder die Zeitpunkte und die Zeit-Abstände als Wege oder Winkelpositionen auf einem den Maschinenzyklus repräsentierenden Kreis (360°) zu berücksichtigen.Practical procedures that are important in practice emerge from claims 15 and 16. Depending on the user, machine manufacturer or conception of the control devices, either the principle of processing the times on a time axis and the intervals between the times as time intervals is preferred, or the times and the time intervals as paths or angular positions on a circle representing the machine cycle ( 360 °).

Das aus den Ansprüchen 17 und 18 entnehmbare Bauprinzip ist nicht nur für Vorrichtungen mit einer Stopvorrichtung und einem Durchgangssensor und radial verstellbarer Trommel brauchbar, sondern auch für Schußfadenliefer- und -meßvorrichtungen mit festem Trommeldurchmesser, einem Durchgangssensor und einer Vielzahl von in Umfangsrichtung gleichmäßig verteilten Stopvorrichtungen oder sogar mit mehreren Durchgangssensoren, wobei dann bei jeder Stopvorrichtung eine Detaktionsvorrichtung vorgesehen ist, um den Ist-Freigabezeitpunkt dieser Stopvorrichtung festzustellen. Bei mehreren Stopvorrichtungen entfällt zwar die Veränderung des Freigabetoleranzbereiches bei Umstellarbeiten zum Anpassen an die Schußfadenlänge; trotzdem kann der Ist-Freigabezeitpunkt abweichen. Bei mehreren Stopvorrichtungen und nur einem Durchgangssensor könnte das Durchgangssignal für die Ermittlung des jeweiligen Ist-Freigabezeitpunkts herangezogen werden, in dem die Steuervorrichtung jeder Stopvorrichtung sozusagen eine individuelle Konstante zuordnet, die vom Winkelabstand zwischen der Stopvorrichtung und dem Durchgangssensor abhängt. Die Konstanten sind dann in einer Art Tabelle gespeichert und werden bei Betätigung der Stopvorrichtung entsprechend abgerufen. Der Vorteil preiswerter Elektro-Magneten kommt dann besonders zum Tragen, da entlang der Speicherfläche bis zu 24 Stopvorrichtungen verteilt sein können.The construction principle which can be gathered from claims 17 and 18 is not only useful for devices with a stop device and a passage sensor and radially adjustable drum, but also for weft thread delivery and measuring devices with a fixed drum diameter, a passage sensor and a multiplicity of stop devices or evenly distributed in the circumferential direction even with several passage sensors, with a detection device being provided for each stop device in order to determine the actual release time of this stop device. With several stop devices, there is no need to change the release tolerance range when changing over to adapt to the weft thread length; nevertheless, the actual release time can differ. If there are several stop devices and only one continuity sensor, the continuity signal could be used to determine the respective actual release time, in which the control device assigns an individual constant to each stop device, which depends on the angular distance between the stop device and the continuity sensor. The constants are then stored in a kind of table and are called up accordingly when the stop device is actuated. The advantage of inexpensive electromagnets is particularly significant since up to 24 stop devices can be distributed along the storage area.

Mit der Vorrichtung gemäß Anspruch 18 läßt sich mit dem ersten Durchgangssignal bei oder kurz nach der Freigabe der Ist-Freigabezeitpunkt genau genug feststellen. Je näher der Durchgangssensor beim Stopelement angeordnet ist, desto genauer ist das Durchgangssignal für den Ist-Freigabezeitpunkt. Die Abweichung zwischen dem Ist-Freigabezeitpunkt und dem Soll-Freigabezeitpunkt ist ein aussagefähiger Richtwert für das Ausmaß und die Richtung der Verstellung oder Veränderung des Parameters für das Freigabesignal, um beim oder bei einem folgenden Eintrag den Ist-Freigabezeitpunkt genau oder fast genau im Soll-Freigabezeitpunkt zu haben. Liegt der Ist-Freigabezeitpunkt nach dem Soll-Freigabezeitpunkt, dann wird der Zeitpunkt für das Freigabesignal vorverstellt oder die Ansprechzeit verkürzt. Liegt hingegen der Ist-Freigabezeitpunkt früher als der Soll-Freigabezeitpunkt, dann wird der Zeitpunkt für das Freigabesignal entsprechend nachverstellt oder die Ansprechzeit verlängert. Die Freigabe wird so ausreichend genau mit der Textilmaschine synchronisiert.With the device according to claim 18 can be determined with the first pass signal at or shortly after the release of the actual release time precisely enough. The closer the continuity sensor is arranged to the stop element, the more precise the continuity signal is for the actual release time. The difference between the actual release time and the target release time is a meaningful guide value for the extent and direction of the adjustment or change of the parameter for the release signal, so that the actual release time for or with a subsequent entry is exactly or almost exactly in the target To have release time. If the actual release time is after the target release time, then the time for the release signal is advanced or the response time is shortened. If, on the other hand, the actual release time is earlier than the target release time, then the time for the release signal is adjusted accordingly or the response time is extended. The release is thus synchronized with the textile machine with sufficient accuracy.

Bei der Ausführungsform gemäß Anspruch 19 verändert der Versorgungsstromregelschaltkreis in Abhängigkeit von einer festgestellten Abweichung zwischen dem Ist-Freigabezeipunkt und dem Soll-Freigabezeitpunkt die Energiebeaufschlagung des Elektro-Magneten, z.B. durch Änderung der Stromstärke, Modulation des Freigabesignals oder mittels ähnlicher elektronischer Einflußnahmen, um die Zeitdauer zwischen dem Zeitpunkt des Beginns des Freigabesignals und dem Ist-Freigabezeitpunkt zu verlängern oder zu verkürzen. In der Praxis könnte dies in einfacher Weise durch eine Veränderung des Anzugsstroms für den Elektro-Magneten erfolgen, während der Haltestrom des Elektro-Magneten nicht verändert wird.In the embodiment according to claim 19, the supply current control circuit changes the function of a determined deviation between the actual release time and the target release time Energy applied to the electro-magnet, e.g. by changing the current, modulating the release signal or by means of similar electronic influences in order to lengthen or shorten the time between the start of the release signal and the actual release time. In practice, this could be done in a simple manner by changing the pull-in current for the electromagnet, while the holding current of the electromagnet is not changed.

Günstig ist ferner die Ausführungsform gemäß Anspruch 20. Der Durchgangssensor findet den Ist-Freigabezeitpunkt
am genauesten, wenn er an der Umfangsposition des Stopelements liegt. Aber auch bei einer in Umlaufrichtung der Abzugsstelle hinter dem Stopelement liegenden Position des Durchgangssensors wird ein für die Ermittlung des Ist-Freigabezeitpunktes aussagekräftiges Durchgangssignal erzeugt. Günstig ist ein möglichst geringer, aber nicht zu kleiner Abstand zwischen dem Stopelement und dem Durchgangssensor, damit ein deutliches Durchgangssignal entsteht.The embodiment according to claim 20 is also favorable. The continuity sensor finds the actual release time
most accurate if it is at the circumferential position of the stop element. But also in a position of the passage sensor lying behind the stop element in the circumferential direction of the withdrawal point, a passage signal meaningful for the determination of the actual release time is generated. It is expedient for the distance between the stop element and the passage sensor to be as small as possible, but not too small, so that a clear passage signal is produced.

Besonders wichtig ist ferner die Ausführungsform gemäß Anspruch 21, weil es herstellungs-, einstellungs- und montagetechnische Vorteile erbringt, wenn die Sensoren und die Stopvorrichtung in ein und derselben Baueinheit untergebracht sind.Furthermore, the embodiment according to claim 21 is particularly important because it produces manufacturing, setting and assembly-related advantages if the sensors and the stop device are accommodated in one and the same structural unit.

Eine weitere, vorteilhafte Ausführungsform geht aus Anspruch 22 hervor. Die Auswerteschaltung der Detektionsvorrichtung ermittelt den Ist-Freigabezeitpunkt durch die für die Freigabe signifikante Verlaufsänderung, z.B. eine Einbuchtung im Verlauf. Diese Einbuchtung tritt abhängig vom jeweiligen Ansprechverhalten des Stopelementes und des Magneten dann auf, wenn der Anker im Begriff ist, seine Endstellung zu erreichen und das Stopelement die Abzugsstelle freigibt. Dies ist ein auch für Vorrichtungen mit mehreren in Umfangsrichtung verteilten Stopvorrichtungen und einer Trommel mit festem Durchmesser brauchbares Prinzip.A further advantageous embodiment is set out in claim 22. The evaluation circuit of the detection device determines the actual release time by means of the release significant change in course, eg an indentation in the course. This indentation occurs depending on the response of the stop element and the magnet when the armature is about to reach its end position and the stop element releases the trigger point. This is a principle that can also be used for devices with several circumferentially distributed stop devices and a drum with a fixed diameter.

Zweckmäßig sind ferner die Ausführungsformen gemäß den Ansprüchen 23 und 24. Die Bewegungsaufnahme des Schußfadens wird unmittelbar festgestellt und so der Ist-Freigabezeitpunkt gefunden.The embodiments according to claims 23 and 24 are also expedient. The movement pick-up of the weft thread is determined immediately and the actual release time is thus found.

Alternativ ist auch die Ausführungsform von Anspruch 25 günstig. Die signifikante Position muß nicht notwendigerweise die vollständig eingezogene Position des Stopelementes sein, sondern die Position, bei der die Wahrscheinlichkeit der Freigabe der Abzugsstelle am größten ist. Der Positionssensor muß deshalb auf die jeweiligen Bedingungen genau einjustiert werden, z.B. auf die Fadenqualität oder Fadenstärke und die Spaltweite.Alternatively, the embodiment of claim 25 is favorable. The significant position does not necessarily have to be the fully retracted position of the stop element, but the position at which the trigger point is most likely to be released. The position sensor must therefore be precisely adjusted to the respective conditions, e.g. on the thread quality or thread thickness and the gap width.

Wichtig ist schließlich auch die Ausführungsform gemäß Anspruch 26, bei der der Soll-Freigabezeitpunkt entweder als Zeitpunkt auf der Zeitachse oder als Winkelposition auf einem 360°-Kreisbogen festgelegt ist.Finally, the embodiment according to claim 26 is also important, in which the target release time is defined either as a time on the time axis or as an angular position on a 360 ° circular arc.

Anhand der Zeichnung werden Ausführungsformen des Erfindungsgegenstandes erläutert. Es zeigen:

Fig. 1 + 2
einen Längsschnitt und eine Stirnansicht einer Schußfadenliefer- und -meßvorrichtung,
Fig. 3
ein Schaubild,
Fig. 4
ein Schema zu Fig. 2,
Fig. 5
eine geänderte Ausführungsform, ähnlich der von Fig. 4,
Fig. 6
eine weitere Ausführungform,
Fig. 7
eine weitere Ausführungsform,
Fig. 8
ein Diagramm,
Fig. 9
ein Blockschaltbild, und
Fig. 10
ein weiteres Blockschaltbild.
Embodiments of the subject matter of the invention are explained with the aid of the drawing. Show it:
Fig. 1 + 2
a longitudinal section and a Front view of a weft delivery and measuring device,
Fig. 3
a graph,
Fig. 4
2 shows a diagram of FIG.
Fig. 5
a modified embodiment, similar to that of Fig. 4,
Fig. 6
another embodiment,
Fig. 7
another embodiment,
Fig. 8
a diagram
Fig. 9
a block diagram, and
Fig. 10
another block diagram.

Eine Schußfadenliefer- und -meßvorrichtung V dient zum Speichern eines fortwährend gebildeten, aus Windungen bestehenden Vorrats T eines Schußfadens F, der für eine Textilmaschine, z.B. eine Düsenwebmaschine, bereitgestellt und taktweise in genau bemessenen Längsabschnitten verbraucht wird. Die Vorrichtung V enthält in einem Gehäuse 1 einen Antriebsmotor M für ein aus einer Hohlwelle 3 und einem schräg davon abstehenden Rohr 4 bestehendes Aufwickelorgan für den Faden F, der an einem Ende der Vorrichtung zugeführt und durch das Aufwickelorgan 4 auf eine trommelförmige Speicherfläche 5 aufgewickelt wird, die aus einzelnen, radial verstellbaren Fingern 6 besteht. Zum Verstellen der Finger 6 dient eine Stellscheibe 7. Die Speicherfläche 5 ist mit Lagern 10 auf dem verlängerten Ende der Hohlwelle 3 drehbar gelagert und wird durch Magneten 9 am Mitdrehen gehindert. Am Gehäuse 1 ist eine Baueinheit B befestigt, die sich über einen begrenzten Umfangsbereich der Speicherfläche 5 erstreckt und mit ihr einen Spalt P begrenzt, durch den der Faden F mit entlang des Abzugsrandes umlaufender Abzugsstelle abziehbar ist.A weft delivery and measuring device V is used to store a continuously formed, consisting of turns supply T of a weft F, which is provided for a textile machine, for example a jet weaving machine, and is used periodically in precisely dimensioned longitudinal sections. The device V contains in a housing 1 a drive motor M for a winding member for the thread F consisting of a hollow shaft 3 and a tube 4 projecting obliquely therefrom, which is fed to one end of the device and wound up by the winding member 4 onto a drum-shaped storage surface 5 , which consists of individual, radially adjustable fingers 6. To adjust the Finger 6 serves an adjusting disc 7. The storage surface 5 is rotatably supported with bearings 10 on the extended end of the hollow shaft 3 and is prevented from rotating by magnets 9. A unit B is attached to the housing 1, which extends over a limited circumferential area of the storage area 5 and, with it, delimits a gap P through which the thread F can be drawn off with a take-off point running around the take-off edge.

Die Baueinheit B enthält eine Stopvorrichtung A, bestehend aus einem radial zwischen einer den Spalt P durchquerenden Stopstellung und einer aus dem Spalt P herausgezogenen Freigabestellung hin- und herbeweglichen Stopelement 11 und einem Elektro-Magneten 12. Ferner enthält sie einen Referenzsensor R und einen Durchgangssensor D. Der Referenzsensor R befindet sich in Umlaufrichtung (durch einen Pfeil angedeutet) der Abzugsstelle vor dem Stopelement 11, der Durchgangssensor D in Umlaufrichtung hingegen knapp hinter dem Stopelement 11. Der Durchgangssensor D könnte auch getrennt von der Baueinheit B angeordnet sein, und zwar zweckmäßigerweise in einem Bereich, der sich in Umlaufrichtung vom Stopelement 11 bis höchstens zur diametral gegenüberliegenden Position erstreckt. Der Durchgangssensor D könnte auch in derselben Umfangsposition angeordnet sein wie das Stopelement 11.The structural unit B contains a stop device A, consisting of a stop element 11 and an electro-magnet 12, which can move back and forth radially between a stop position crossing the gap P and a release position pulled out of the gap P. Furthermore, it contains a reference sensor R and a passage sensor D. The reference sensor R is located in the circumferential direction (indicated by an arrow) of the trigger point in front of the stop element 11, the passage sensor D in the circumferential direction, however, just behind the stop element 11. The passage sensor D could also be arranged separately from the unit B, and expediently in an area which extends in the circumferential direction from the stop element 11 to at most the diametrically opposite position. The passage sensor D could also be arranged in the same circumferential position as the stop element 11.

Die Baueinheit B läßt sich mittels einer lösbar befestigten Halterung 13 in radialer Richtung verstellen, damit je nach der radialen Stellung der Finger 6 der Spalt P eingehalten wird.The structural unit B can be adjusted in the radial direction by means of a detachably fastened holder 13, so that the gap P is maintained depending on the radial position of the fingers 6.

Im oder am Gehäuse 1 ist ferner eine elektronische Hauptsteuervorrichtung C, z.B. für den Motor M, vorgesehen, der eine elektronische Steuervorrichtung C₁ zugeordnet ist. Beide Steuervorrichtungen C, C₁ stehen mit den Sensoren R, D und dem Elektro-Magneten 12 in signalübertragender Verbindung. Ferner sind die Steuervorrichtungen C, C₁ an die nicht dargestellte Textilmaschine derart angeschlossen, daß sie zumindest mit vom Zyklus der Textilmaschine abhängigen Synchronisationssignalen versorgt werden, und gegebenenfalls einmal oder permanent mit einem den Soll-Freigabezeitpunkt festlegenden Signal. An diesem Zeitpunkt fordert die Webmaschine sozusagen zyklusabhängig die Freigabe des Schußfadens zum Abzug. Die Abzugsgeschwindigkeit des Fadens F sowie weitere wichtige Parameter können in C, C₁ eingegeben werden. Bei den Steuervorrichtungen C, C₁ ist zweckmäßigerweise wenigstens ein Mikroprozessor mit Speicher vorgesehen. Zusätzlich kann eine Tastatur oder ein Anschluß für einen Controller zum Setzen von Funktionsparametern vorgesehen sein.In or on the housing 1 there is also an electronic one Main control device C, for example for the engine M, which is assigned an electronic control device C 1. Both control devices C, C₁ are with the sensors R, D and the electromagnet 12 in a signal-transmitting connection. Furthermore, the control devices C, C₁ are connected to the textile machine, not shown, in such a way that they are supplied at least with synchronization signals which are dependent on the cycle of the textile machine, and, if appropriate, once or permanently with a signal which determines the target release time. At this point in time, the weaving machine asks for the release of the weft thread, so to speak, as a cycle. The withdrawal speed of the thread F and other important parameters can be entered in C, C₁. In the control devices C, C₁ at least one microprocessor with memory is expediently provided. In addition, a keyboard or a connection for a controller can be provided for setting function parameters.

Das Aufwickelorgan 4 hält den Vorrat auf einer vorbestimmten und durch den Referenzsensor R überwachten Größe. In der in den Fig. 1 und 2 gezeigten Stellung der Stopvorrichtung A ist die Fadenabzugsstelle an ihrer Umlaufbewegung durch das in der Stopstellung stehende Stopelement 11 gehindert. Der Faden F erstreckt sich vom Stopelement 11 zu einer nicht dargestellten, zur Hohlwelle 3 konzentrischen Fadenöse oder direkt zu einer Eintragdüse für eine Düsenwebmaschine.The winding member 4 keeps the stock at a predetermined size and monitored by the reference sensor R. In the position of the stop device A shown in FIGS. 1 and 2, the thread take-off point is prevented from rotating around by the stop element 11 standing in the stop position. The thread F extends from the stop element 11 to a thread eyelet (not shown) which is concentric with the hollow shaft 3 or directly to an insertion nozzle for a jet loom.

Zum Eintragen eines Schußfadens mit vorbestimmter Länge, die der Steuervorrichtung C aufgegeben ist, wird von der Textilmaschine ein Synchronisationssignal erhalten, worauf das Stopelement 11 durch den Elektro-Magneten 12 in seine Freigabestellung bewegt und der Faden F mit umlaufender Abzugsstelle abgezogen wird. Bei jedem Durchgang der Abzugsstelle unter dem Durchgangssensor D wird ein Durchgangssignal erzeugt und den Sternervorrichtungen übermittelt. Die Steuervorrichtungen C, C₁ brechen vor Erreichen der vorbestimmten Schußfadenlänge das Freigabesignal für den Elektro-Magneten 12 ab, damit die Abzugsstelle im richtigen Moment vom Stopelement 11 abgefangen wird. Da nur eine Stopvorrichtung B vorgesehen ist, wird die Schußfadenlänge zuvor mittels der radial verstellbaren Finger 6 derart eingestellt, daß eine Windung im Vorrat R einem ganzzahligen Bruchteil der Schußfadenlänge entspricht.To enter a weft thread with a predetermined length, which is given to the control device C, a synchronization signal is obtained from the textile machine. whereupon the stop element 11 is moved into its release position by the electro-magnet 12 and the thread F is drawn off with the circumferential take-off point. Each time the trigger point passes under the passage sensor D, a passage signal is generated and transmitted to the star devices. The control devices C, C₁ break off the release signal for the electro-magnet 12 before reaching the predetermined weft thread length, so that the withdrawal point is intercepted by the stop element 11 at the right moment. Since only one stop device B is provided, the weft thread length is set beforehand by means of the radially adjustable fingers 6 in such a way that one turn in the supply R corresponds to an integral fraction of the weft thread length.

Zwischen dem Zeitpunkt des Beginns des Freigabesignals für den Elektro-Magneten 12 und dem Ist-Freigabezeitpunkt verstreicht eine bestimmte Zeitspanne, die nicht exakt vorherbestimmbar ist. Damit der Ist-Freigabezeitpunkt jedoch mit dem, z.B. auf das von der Textilmaschine gegebene Synchronisationssignal bezogenen, Soll-Freigabezeitpunkt zur Übereinstimmung kommt, wird, z.B. in der Steuervorrichtung C₁, in der Anfangsphase eines Eintragvorganges der Ist-Freigabezeitpunkt festgestellt und mit dem Soll-Freigabezeitpunkt verglichen. Liegt eine Abweichung vor, dann wird ein den Ist-Freigabezeitpunkt beeinflussender Parameter steuerungsseitig verstellt. Dies kann der Zeitpunkt des Beginns des Freigabesignals oder die Strombeaufschlagung des Elektro-Magneten 12 oder das mechanische Ansprechverhalten der Stopvorrichtung sein. Die Verstellung oder Änderung erfolgt im Hinblick daruf, daß der nächste oder ein nächster Ist-Freigabezeitpunkt nahezu vollständig mit dem Soll-Freigabezeitpunkt übereinstimmt. Eine Ungenauigkeit bis zu etwa 3° pro 360° eines Maschinezyklus wird dabei beispielsweise als noch zulässig angesehen. Dieser Zulässigkeitsbereich kann maschinenabhängig jedoch auch enger oder weiter sein.A certain period of time elapses between the time of the start of the release signal for the electromagnet 12 and the actual release time, which cannot be exactly predetermined. So that the actual release time, however, with the, for example related to the synchronization signal given by the textile machine, target release time comes to agreement, for example in the control device C 1, the actual release time is determined in the initial phase of an entry process and with the target release time compared. If there is a deviation, a parameter influencing the actual release time is adjusted on the control side. This can be the time of the start of the release signal or the current applied to the electromagnet 12 or the mechanical response of the stop device. The adjustment or change is made with a view to the next or one The next actual release time corresponds almost completely to the target release time. An inaccuracy of up to approximately 3 ° per 360 ° of a machine cycle is considered to be still permissible, for example. Depending on the machine, this permissible range can also be narrower or wider.

Bei der Ausführungsform gemäß den Fig. 1 und 2 wird zum Ermitteln des Ist-Freigabezeitpunkts das erste Durchgangssignal des Durchgangssensors D benutzt. Wie aus Fig. 4 erkennbar ist, ist der Abstand Q zwischen dem Stopelement 11 und dem Durchgangssensor D bekannt. Mit der ebenfalls bekannten Fadenabzugsgeschwindigkeit V oder auch wie durch empirische Versuche festgestellt, verstreicht zwischen dem aktuellen Freigabezeitpunkt des Fadens F am Stopelement 11 und dem Durchgang des Fadens F unter dem Durchgangssensor D eine bestimmte Zeitspanne. Der Ist-Freigabezeitpunkt wird anhand des ersten Durchgangssignals in der Steuervorrichtung C₁ zurückgerechnet oder mittels einer Konstanten festgelegt. Bei kurzem Abstand Q wird dieser gegebenenfalls ignoriert, weil er für die Genauigkeit des Verfahrens unerheblich ist. Die Steuervorrichtung C₁ vergleicht, ob der Ist-Freigabezeitpunkt relativ zum Soll-Freigabezeitpunkt nach- oder voreilt und wie groß die Abweichung ist. Sobald die Abweichung ermittelt ist, wird der erwähnte Parameter, z.B. der Zeitpunkt für den Beginn des Freigabesignals, für den Elektro-Magneten 12 entsprechend verstellt, so daß bei einem folgenden Eintrag der Ist-Freigabezeitpunkt mit dem Soll-Freigabezeitpunkt übereinstimmt.In the embodiment according to FIGS. 1 and 2, the first continuity signal of the continuity sensor D is used to determine the actual release time. As can be seen from FIG. 4, the distance Q between the stop element 11 and the passage sensor D is known. With the likewise known thread take-off speed V or also as determined by empirical tests, a certain time elapses between the current time of release of the thread F at the stop element 11 and the passage of the thread F under the passage sensor D. The actual release time is calculated back on the basis of the first continuity signal in the control device C 1 or determined by means of a constant. If the distance Q is short, it may be ignored because it is irrelevant to the accuracy of the method. The control device C 1 compares whether the actual release time lagging or leading relative to the target release time and how large the deviation is. As soon as the deviation is determined, the mentioned parameter, e.g. the time for the start of the release signal for the electromagnet 12 is adjusted accordingly, so that the actual release time coincides with the desired release time in the case of a subsequent entry.

Fig. 3 zeigt auf der horizontalen Achse I (Zeitachse oder Winkelachse) Synchronisationssignale S1, S2, S3 von der Textilmaschine in vorbestimmten Zeit- oder Winkelabständen. Der Winkelabstand beträgt z.B. jeweils 360°. Jedem Synchronisationssignal folgt mit vorbestimmtem Abstand a ein Soll-Freigabezeiptunkt SS₁, SS₂, SS₃. Auf der Achse II sind für eine nicht-gezeigte Eintragdüse der Textilmaschine erzeugte Aktivierungssignale E1, E2, E3 angedeutet. Jeweils mit der vorderen Flanke des Signals E1, E2, E3 wird die Eintragdüse aktiviert; mit der jeweils hinteren Flanke wird sie deaktiviert. Auf der horizontalen Achse III sind die Freigabesignale G1, G2, G3 für den Elektro-Magneten 12 angedeutet. Mit der vorderen Flanke jedes Signals G1, G2, G3 wird der Elektro-Magnet 12 betätigt, um das Stopelement 11 in die Freigabestellung zu bewegen. Mit der hinteren Flanke jedes Signals G1, G2, G3 wird der Elektro-Magnet 12 entregt. Auf der Achse VI sind die Bewegungen des Stopelementes 11 band der Kurven N1, N2, N3 angedeutet. Das Stopelement 11 gelangt mit einer Ansprechverzögerung in die Freigabestellung (obere Grenzlinie) und geht mit einer Verzögerung wieder in die Stopstellung (Achse VI). Auf der Achse IV sind die Ist-Freigabezeitpunkte K1, K2, K3 gezeigt. Der Ist-Freigabezeitpunkt K1 weicht um ein Maß X vom Soll-Freigabezeitpunkt SS₁ ab. Das nächste Freigabesignal G2 wird deshalb in etwa um das Maß X' in Richtung eines Pfeiles verstellt. Beim nächsten Eintrag wird dann das Signal G2 relativ zum soll-Freigabezeitpunkt SS₂ etwas später erzeugt als beim Soll-Freigabezeitpunkt SS₁. Während dieses Eintrags wird wiederum der Ist-Freigabezeitpunkt K2 ermittelt, der vom Soll-Freigabezeitpunkt SS₂ um ein Maß Y abweicht. Der Zeitpunkt für das nächste Freigabesignal G3 wird daraufhin um in etwa das Maß Y' in Pfeilrichtung verstellt. Beim nächsten Eintrag wird dann das Signal G3 etwas früher - bezogen auf den Soll-Freigabezeitpunkt SS₃ - erzeugt als beim Soll-Freigabezeitpunkt SS₂. Der dann ermittelte Ist-Freigabezeitpunkt K3 stimmt mit dem Soll-Freigabezeitpunkt SS₃ überein. Eine weitere Verstellung des Freigabesignals erfolgt dann solange nicht mehr, als der Ist-Freigabezeitpunkt weiterhin mit dem Soll-Freigabezeitpunkt übereinstimmt. Auf der Achse V sind die vom Durchgangssensor D erzeugten Durchgangssignale L aufgetragen. Die Signale L haben untereinander gleiche Abstände. Ihre Anzahl pro Zyklus repräsentiert die Schußfadenlänge. Der Abstand zwischen dem jeweiligen Soll-Freigabezeitpunkt SS₁, SS₂, SS₃ und der vorderen Flanke des jeweils ersten Durchgangssignals L variiert infolge der Verstellung der Freigabesignale G1, G2, G3 entsprechend.3 shows synchronization signals S1, S2, S3 from on the horizontal axis I (time axis or angular axis) the textile machine at predetermined time or angular intervals. The angular distance is 360 °, for example. Each synchronization signal follows with a predetermined distance a a target release point SS₁, SS₂, SS₃. Activation signals E1, E2, E3 generated for an entry nozzle (not shown) of the textile machine are indicated on axis II. The entry nozzle is activated with the leading edge of the signal E1, E2, E3; it is deactivated with the rear flank. The enable signals G1, G2, G3 for the electromagnet 12 are indicated on the horizontal axis III. With the leading edge of each signal G1, G2, G3, the electro-magnet 12 is actuated to move the stop element 11 into the release position. The electromagnet 12 is de-energized with the trailing edge of each signal G1, G2, G3. The movements of the stop element 11 band of the curves N1, N2, N3 are indicated on the axis VI. The stop element 11 arrives in the release position (upper limit line) with a delay in response and returns to the stop position (axis VI) with a delay. The actual release times K1, K2, K3 are shown on axis IV. The actual release time K1 deviates by an amount X from the target release time SS₁. The next release signal G2 is therefore adjusted approximately by the dimension X 'in the direction of an arrow. With the next entry, the signal G2 is generated relative to the target release time SS₂ a little later than at the target release time SS₁. During this entry, the actual release time K2 is again determined, which deviates from the target release time SS₂ by a measure Y. The time for the next release signal G3 is then adjusted by approximately the dimension Y 'in the direction of the arrow. With the next entry, the signal G3 somewhat earlier - based on the target release time SS₃ - generated than at the target release time SS₂. The actual release time K3 then determined agrees with the target release time SS₃. The release signal is then no longer adjusted as long as the actual release time continues to coincide with the target release time. The continuity signals L generated by the continuity sensor D are plotted on the axis V. The signals L have the same spacing from one another. Their number per cycle represents the weft length. The distance between the respective target release time SS₁, SS₂, SS₃ and the leading edge of the first pass signal L varies accordingly due to the adjustment of the release signals G1, G2, G3.

Bei der Ausführungsform gemäß Fig. 5 (Ansicht in Umlaufrichtung) wird der Ist-Freigabezeitpunkt durch direktes Abtasten ermittelt. Zu diesem Zweck ist der Durchgangssensor D an derselben Umfangsposition wie das Stopelement 11 angeordnet. Er erzeugt das erste Durchgangssignal, sobald die Abzugsstelle ihre Bewegung aufnimmt.In the embodiment according to FIG. 5 (view in the direction of rotation), the actual release time is determined by direct scanning. For this purpose, the passage sensor D is arranged at the same circumferential position as the stop element 11. It generates the first continuity signal as soon as the trigger point starts moving.

Bei der Ausführungsform gemäß Fig. 6 ist ein opto-elektronischer Positionssensor als Detektionsvorrichtung I für das Stopelement 11 vorgesehen, der bei dessen Bewegung in die Freigabestellung an einer für die Freigabe der Abzugsstelle signifikanten Position des Stopelementes 11 ein Signal erzeugt. Dieses Signal könnte auch mit einem induktiven Sensor erzeugt werden. Der Zeitpunkt des Auftretens des Signals ist der Ist-Freigabezeitpunkt.In the embodiment according to FIG. 6, an optoelectronic position sensor is provided as a detection device I for the stop element 11, which generates a signal when it moves into the release position at a position of the stop element 11 that is significant for the release of the trigger point. This signal could also be generated with an inductive sensor. The time of occurrence of the signal is the actual release time.

Bei der Ausführungsform gemäß Fig. 7 ist als Detektionsvorrichtung I ein Bewegungsmelder für die Fadenlängsbewegung vorgesehen, der, z.B. durch eine Fadenöse 15 mit einem piezo-elektrischen Sensor 16 gebildet wird. Dieser Bewegungsmelder kann im Fadenweg von der Speicherfläche 5 bis in die Textilmaschine an jeder geeigneten Position angeordnet sein.In the embodiment according to FIG. 7, a motion detector for the longitudinal movement of the thread is provided as the detection device I, which, e.g. is formed by a thread eyelet 15 with a piezoelectric sensor 16. This motion detector can be arranged in the thread path from the storage area 5 to the textile machine at any suitable position.

Fig. 8 verdeutlicht, wie durch Abtasten des Freigabesignals 17 des Elektro-Magneten 12 anhand der elektromotorischen Kraft der Ist-Freigabezeitpunkt festgestellt wird. Die ausgezogene Kurve 17 repräsentiert den Verlauf des Signals bei der Bewegung des Stopelementes 11. Wenn der Anker des Elektro-Magneten 12 seine Endstellung erreicht und das Stopelement 11 die Abzugsstelle zur Bewegung freigibt, zeigt die Kurve 17 eine deutliche Einbuchtung 18. Der Zeitpunkt dieser Einbuchtung 18 repräsentiert den Ist-Freigabezeitpunkt K1, Kn, K3. Wird der Verlauf wie in der strichlierten Kurve 17' verzögert, dann tritt die Einbuchtung 18' zu einem späteren Zeitpunkt auf. Der Unterschied zwischen den Kurven 17, 17' könnte auch steuerungsseitig bewußt, etwa durch Änderung der Strombeaufschlagung des Elektro-Magneten, erzeugt werden, um bei unverändertem Zeitpunkt für den Beginn des Freigabesignals den Ist-Freigabezeitpunkt zum Angleichen an den Soll-Freigabezeitpunkt vor- oder nachzuverlegen.8 illustrates how the actual release time is determined by sampling the release signal 17 of the electromagnet 12 based on the electromotive force. The solid curve 17 represents the course of the signal when the stop element 11 moves. When the armature of the electromagnet 12 reaches its end position and the stop element 11 releases the trigger point for movement, the curve 17 shows a clear indentation 18. The time of this indentation 18 represents the actual release time K1, Kn, K3. If the course is delayed as in the dashed curve 17 ', the indentation 18' occurs at a later point in time. The difference between the curves 17, 17 'could also be generated consciously on the control side, for example by changing the current applied to the electromagnet, so that the actual release time for adjustment to the target release time can be adjusted for the start or the start signal of the release signal to postpone.

Im Blockschaltbild von Fig. 9, das den steuerungsseitigen Aufbau in Verbindung mit dem Diagramm von Fig. 3 zeigt, ist die Textilmaschine 20, z.B. eine Düsenwebmaschine, mit einem Bedienpaneel 21 ausgestattet, das an eine Steuervorrichtung 22 der Textilmaschine angeschlossen ist. Das Paneel 21 weist z.B. Eingabetasten und ein Display auf. Die Sternervorrichtung 22 steuert die nicht-gezeigten aktiven und passiven Komponenten der Textilmaschine in Abhängigkeit von eingegebenen und schon gespeicherten Daten. Von der Steuervorrichtung 22 führen zwei Signalleitungen 23, 24 zu den Steuervorrichtungen C, C₁ der Schußfadenliefer- und -meßvorrichtung V. Auf der Leitung 23 wird zumindest einmal oder auch fortwährend der Soll-Freigabezeitpunkt in Form eines auf den Maschinenzyklus bezogenen Signals an die Sternervorrichtungen C, C₁ übertragen. Die Signalleitung 24 dient zum Übertragen des Synchronisationssignals.In the block diagram of FIG. 9, which shows the control-side structure in connection with the diagram of FIG. 3, the textile machine 20, for example a jet weaving machine, is equipped with an operating panel 21 which is connected to a control device 22 of the Textile machine is connected. The panel 21 has, for example, input keys and a display. The star device 22 controls the active and passive components of the textile machine, not shown, as a function of input and already stored data. From the control device 22 lead two signal lines 23, 24 to the control devices C, C₁ of the weft delivery and measuring device V. On the line 23, at least once or continuously, the target release time in the form of a signal related to the machine cycle to the star devices C. , C₁ transmitted. The signal line 24 is used to transmit the synchronization signal.

In den Steuervorrichtungen C, C₁, die einen nicht dargestellten Mikroprozessor mit Speichereinrichtungen enthalten, sind ein Vergleicherschaltkreis 27 und ein diesem über eine Leitung 28 nachgesetzter Angleichschaltkreis 29 vorgesehen. An den Eingang des Vergleicherschaltkreises 27 ist über eine die Ist-Freigabezeitpunkt-Signale übertragende Leitung 26 ein Freigabesensor 25 angeschlossen, z.B. der Durchgangssensor D oder die Detektionsvorrichtung I. An den Ausgang des Angleichschaltkreises 29 ist über eine das Freigabesignal übertragende Leitung 30 der Elektro-Magnet 12 des Stopelementes 11 angeschlossen. Sofern das Soll-Freigabezeitpunkt-Signal nur einmal erzeugt wird, ist dafür ein Speicher vorgesehen, aus dem der Vergleicherschaltkreis 27 den Soll-Freigabezeitpunkt jeweils bei Empfang eines Synchronisationssignals abruft. Im anderen Fall liegt der Soll-Freigabezeitpunkt ohnedies einmal bei jedem Zyklus vor.In the control devices C, C₁, which contain a microprocessor, not shown, with memory devices, a comparator circuit 27 and a subsequent adjustment circuit 29 via a line 28 are provided. A release sensor 25 is connected to the input of the comparator circuit 27 via a line 26 which transmits the actual release time signals, e.g. the continuity sensor D or the detection device I. The electro-magnet 12 of the stop element 11 is connected to the output of the adjustment circuit 29 via a line 30 which transmits the release signal. If the target release time signal is generated only once, a memory is provided for this purpose, from which the comparator circuit 27 retrieves the target release time each time a synchronization signal is received. In the other case, the target release time is in any case once for each cycle.

In dem Blockschaltbild gemäß Fig. 10 ist eine Variante der steuerungsseitigen Komponenten zum Angleichen des Ist-Freigabezeitpunktes an den Soll-Freigabezeitpunkt dargestellt. In den Steuervorrichtungen C, C₁ der Vorrichtung V ist ein Mikroprozessor 30 mit nicht-dargestellten Speichereinrichtungen enthalten, der aus der Leitung 23 zumindest einmal das Signal für den Soll-Freigabezeitpunkt erhält. Gleichzeitig ist an den Mikroprozessor 30 der Freigabesensor 25, d.h. der Durchgangssensor D oder die Detektionsvorrichtung I, angeschlossen. Über die Signalleitung 31 werden die den Ist-Freigabezeitpunkt repräsentierenden Signale übertragen. Ausgangsseitig ist der Mikroprozessor 30 über zwei Leitungen 32, 33 mit einem Treiberschaltkreis 34 für den Elektro-Magneten 12 verbunden. An den Treiberschaltkreis 34 ist eine Energieversorgungsleitung 35 angeschlossen. Auf der Leitung 32 wird jeweils das Freigabesignal übertragen, während über die Leitung 33 Steuersignale für den vom Treiberschaltkreis 34 an den Elektromagneten 12 übertragenen Strom bereitgestellt werden. Über die Leitung 36 erfolgt dann die Übertragung des Freigabesignalstroms an den Magneten 12, der seinerseits das Stopelement bewegt.A variant is shown in the block diagram according to FIG. 10 of the control-side components for aligning the actual release time with the target release time. In the control devices C, C₁ of the device V, a microprocessor 30 with memory devices, not shown, is included, which receives at least once the signal for the target release time from line 23. At the same time, the release sensor 25, ie the passage sensor D or the detection device I, is connected to the microprocessor 30. The signals representing the actual release time are transmitted via the signal line 31. On the output side, the microprocessor 30 is connected to a driver circuit 34 for the electromagnet 12 via two lines 32, 33. A power supply line 35 is connected to the driver circuit 34. The release signal is transmitted on line 32, while control signals for the current transmitted from driver circuit 34 to electromagnet 12 are provided via line 33. The release signal current is then transmitted via line 36 to the magnet 12, which in turn moves the stop element.

Dabei wird wie folgt vorgegangen:The procedure is as follows:

Der Mikroprozessor 30 gibt das Freigabesignal jeweils zum gleichen Zeitpunkt bei einem Maschinenzyklus ab. Der Mikroprozessor 30 stellt auch den Vergleich zwischen dem Ist-Freigabezeitpunkt und dem Soll-Freigabezeitpunkt fest. Wird dabei eine Abweichung festgestellt, dann verändert der Mikroprozessor 30 beispielsweise das Stromsteuersignal auf der Leitung 33, um den Ist-Freigabezeitpunkt für einen folgenden Eintrag an den Soll-Freigabezeitpunkt anzupassen. Üblicherweise wird nämlich dem Elektro-Magneten 12 mit dem Freigabesignal zunächst ein hoher Anzugsstrom und nach einer vorbestimmten Zeitdauer ein niedrigerer Haltestrom zugeführt. Durch Verändern des Anzugsstroms läßt sich wiederum die Ansprechdauer des Systems aus Elektro-Magneten und Stopelement verkürzen oder verlängern. Auf diese Weise steuert der Mikroprozessor 30 die Angleichung des Ist-Freigabezeitpunkts an den Soll-Freigabezeitpunkt, indem er bei gleichbleibendem Zeitpunkt für das Freigabesignal auf der Leitung 32 z.B. den Anzugsstrom entsprechend verändert.The microprocessor 30 emits the release signal at the same time in each case in one machine cycle. The microprocessor 30 also determines the comparison between the actual release time and the target release time. If a deviation is found, the microprocessor 30 changes, for example, the current control signal on the line 33 in order to adapt the actual release time for a subsequent entry to the desired release time. Usually namely, the electromagnet 12 with the release signal is initially supplied with a high starting current and after a predetermined period of time with a lower holding current. By changing the starting current, the response time of the system consisting of the electromagnet and the stop element can be shortened or extended. In this way, the microprocessor 30 controls the adjustment of the actual release time to the target release time by, for example, correspondingly changing the starting current for the release signal on line 32.

Claims (26)

  1. Process for the control of a weft thread feeding and measuring device (V) for a textile machine (20), particularly for a jet weaving machine, in which for a weft thread pick a release signal (Gn) for the electromagnet (12) of a stop element (11) is generated so that the stop element (11) is moved into a release position and releases the weft thread (F) at an actual release time (Kn) for drawing-off and picking, characterized in that at the pick the actual release time (Kn) is determined and compared with a desired release time (SSn) dependent on the textile machine (20) and that a parameter influencing the actual release time for the release signal (Sn) is adjusted according to an ascertained deviation between the actual release time and the desired release time in such a way that at a subsequent pick the actual release time is adapted at least approximately to the desired release time.
  2. Process according to Claim 1, characterized in that the parameter adjusted is time of the release signal.
  3. Process according to Claim 1, characterized in that the parameter changed is the power application for the electromagnet (12) of the stop element (11).
  4. Process according to Claim 1, characterized in that the parameter changed is the mechanical response behaviour of the stop element (11) and of the electromagnet (12) if required.
  5. Process according to Claim 1, characterized in that the desired release time (SSn) is determined at least once per operating period of the textile machine (20), preferably in relation to a synchronization signal (Sn) of the textile machine.
  6. Process according to Claim 5, characterized in that the desired release time (SSn) is polled when the synchronization signal (Sn) occurs in each case.
  7. Process according to Claim 1, characterized in that the adaptation of the actual release time (Kn) to the desired release time (SSn) is carried out at each pick.
  8. Process according to Claim 1, characterized in that the adaptation is carried out automatically, and preferably in selected operating phases in the course of an operating period of the textile machine.
  9. Process according to Claims 1 to 8, the take-off of the weft thread (F) which takes place with a rotary movement being monitored with the aid of weft thread feedthrough signals (L), characterized in that the actual release time (Kn) is determined on the basis of a first weft-thread passing signal (L).
  10. Process according to Claim 9, characterized in that the first passing signal (L) is generated at the actual release of the take-off point or in the rotational direction of the take-off point shortly thereafter, and that the actual release time (Kn) is determined only by determining the time of the passing signal, or by calculating back from the time of the passing signal on the basis of the thread speed, or by taking a constant into account.
  11. Process according to Claims 1 to 8, characterized in that the actual release time (Kn) is determined by active scanning.
  12. Process according to Claim 11, characterized in that the actual release time (Kn) is scanned directly at the weft thread (F) or at the stop element (11) or indirectly at the magnet (12) of the stop element (11).
  13. Process according to Claim 11, characterized in that in the course of the movement of the stop element (11) into the release position the weft thread (F) at the stop element (11) or the stop element (11) in a position significant to the release of the take-off point is scanned by opto-electronic, capacitive, inductive or piezo-electric means.
  14. Process according to Claim 11, characterized in that the course of the release signal for the electromagnet (12) of the stop element (11) is scanned on the basis of a generated electromotive force for a change in course representing the release of the take-off point.
  15. Process according to Claim 2, characterized in that the adjustment of the time of the release signal takes place on a time axis on which the desired release time is determined.
  16. Process according to Claim 2, characterized in that the adjustment of the time of the release signal is carried out in the angular dimension on an arc of a circle and that the desired release time is determined as an angular position between 0° and 360° of a revolution of the textile machine cycle.
  17. Weft thread feeding and measuring device for a textile machine, particularly for a jet weaving machine, with a storage surface for the weft thread, which can be drawn off from a supply comprising turns on the storage surface with rotating take-off point, with at least one stop device (A) which has a stop element which can be actuated by an electromagnet (12) and which moves to and fro between a stop position and a release position, the take-off point being prevented from the rotary movement in the stop position of the stop element and released for the rotary movement in the release position, and with an electronic control device (C, C₁) informed at least by periodically generated synchronization signals about the working cycles of the textile machine, to which control device at least the electromagnet is connected, characterized in that at the stop device (A) a detection device (I) connected to the control device (C, C₁) and for scanning the current actual release time of the take-off point is provided, and that the control device (C, C₁) has at least one comparing (27) and adapting (29) circuit for adjusting a parameter which influences the actual release time, e.g. the time of the start of the release signal, the power application to the electromagnet or the mechanical response behaviour of the stop device, for the release signal for the electromagnet (12) on the basis of a deviation between the actual release time and a desired release time specified by the textile machine, in order to adapt the actual release time for a subsequent pick to the desired release time.
  18. Weft thread feeding and measuring device according to Claim 17, characterized in that at least one passing sensor (D) allocated to the stop device (A) is aligned on the rotary path of the weft thread (F), which is arranged in the rotational direction of the take-off point at or behind the stop element (11) and is connected to the control device (C, C₁), and that with the comparing (27) and adapting (29) circuit in the control device (C, C₁) the actual release time (Kn) of the take-off point can be determined on the basis of a passing signal (L) of the passing sensor (D).
  19. Weft thread feeding and measuring device according to Claims 17 and 18, characterized in that a power supply control circuit (33, 34) for the release signal of the electromagnet (12) is provided at the adapting circuit (29).
  20. Weft thread feeding and measuring device according to Claim 18, characterized in that the passing sensor (D) is arranged in an area adjoining the stop element in the rotational direction of the take-off point.
  21. Weft thread feeding and measuring device according to Claims 17 to 20, characterized in that at a radial distance from the storage surface in the form of a radially adjustable drum a radially adjustable unit (B) limited in the rotational direction of the drum is provided, which contains in the centre the stop device with the stop element (11) and on both sides of the stop element (11) the passing sensor (D) as well as a reference sensor (R) for the size of the supply, and that in the unit (B) the passing sensor (D) is arranged behind the stop element (11) and the reference sensor (R) in front of the stop element (11) in the rotational direction of the take-off point.
  22. Weft thread feeding and measuring device according to Claim 17, characterized in that the detection device (I) has an evaluation circuit for the course, particularly a change of course (18), representing the release of the take-off point, of the release signal (17, 17') on the basis of the generated electromotive force of the electromagnet (12) of the stop element (11) on the release movement of the stop element (11).
  23. Weft thread feeding and measuring device according to Claim 17, characterized in that the detection device (I) has an opto-electronic, capacitive or piezo-electric thread movement indicator (15, 16).
  24. Weft thread feeding and measuring device according to Claim 17, characterized in that the detection device (I) has a thread length movement indicator along the thread path from the storage surface (5) to the textile machine.
  25. Weft thread feeding and measuring device according to Claim 17, characterized in that the detection device (I) has an opto-electronic or inductive position sensor (14) for a position of the stop element (11) representing the release of the take-off point.
  26. Weft thread feeding and measuring device according to Claims 17 to 25, characterized in that the control device (C, C₁) is connected to a signal transmitter (S, 22) providing a synchronization signal and/or a desired release time signal, either as a fixed time on a time axis or as an angular position in the course of a textile machine cycle in each case.
EP91914777A 1990-08-21 1991-08-20 Process for controlling a weft thread feed and measurement device Expired - Lifetime EP0544730B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4026434A DE4026434A1 (en) 1990-08-21 1990-08-21 METHOD FOR CONTROLLING A WIFE DELIVERY AND MEASURING DEVICE AND WIFE DELIVERY AND MEASURING DEVICE
DE4026434 1990-08-21
PCT/EP1991/001579 WO1992003604A1 (en) 1990-08-21 1991-08-20 Process for controlling a weft thread feed and measurement device

Publications (2)

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EP0544730A1 EP0544730A1 (en) 1993-06-09
EP0544730B1 true EP0544730B1 (en) 1994-12-28

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EP (1) EP0544730B1 (en)
JP (1) JPH06500365A (en)
DE (2) DE4026434A1 (en)
WO (1) WO1992003604A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19824613A1 (en) * 1998-06-02 1999-12-09 Dornier Gmbh Lindauer Process for monitoring the weft release and stopping process on winding machines for looms
CN107794627B (en) * 2017-12-08 2023-05-02 浙江三禾智能科技有限公司 Novel weft accumulator of water-jet/air-jet loom

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59125944A (en) * 1982-12-27 1984-07-20 日産自動車株式会社 Weft yarn feeder of segment loom
US4768565A (en) * 1984-09-27 1988-09-06 Aktiebolaget Iro Method for controlling a yarn storing, feeding and measuring device
JPH0733614B2 (en) * 1985-04-05 1995-04-12 津田駒工業株式会社 Horizontal insertion control method and apparatus
US4843290A (en) * 1985-12-28 1989-06-27 Tsudakoma Kogyo Kabushiki Kaisha Control system for engagement pin in durm-type weft storage unit
JPS6328944A (en) * 1986-07-14 1988-02-06 津田駒工業株式会社 Method and apparatus for setting length measuring quantity of wefting apparatus
DE3862671D1 (en) * 1987-04-08 1991-06-13 Sulzer Ag Weft thread memory for a weaving machine.

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EP0544730A1 (en) 1993-06-09
JPH06500365A (en) 1994-01-13
DE4026434A1 (en) 1992-02-27
WO1992003604A1 (en) 1992-03-05
DE59104089D1 (en) 1995-02-09

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