• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Shuttle embroidery machine with a measuring device for monitoring the thread tension of the needle thread (2), wherein the needle thread (2) spans the free end of a measuring lever forming a thread loop (19), the deflection of which can be detected metrologically in the manner of analog measured values.
    公开号:CH711314A2
    申请号:CH00794/16
    申请日:2016-06-22
    公开日:2017-01-13
    发明作者:Ulmann Andreas；Vanoni Gerardo；Friedrich Gerardo
    申请人:Saurer Ag；
    IPC主号:
    专利说明:

    The invention relates to a shuttle embroidery machine with a measuring device for monitoring the thread tension of the needle thread and a method for operating the measuring device for monitoring the thread tension.
    From the going back to the same applicant DE 3 421 024 C2, only a thread tensioning device with a thread monitor has become known, the occurring at each monofilament overvoltages, but also undervoltage detected. This takes place in that in each case lamellae contact touching the needle threads, which are pivotally mounted on one side, but are not bendable, and are deflected at an undervoltage or a thread break by a certain pivot angle, wherein the pivot angle depends on the thread tension.
    It is therefore given only a status display, but no measuring device, because only the states of the undervoltage, the normal operation and an overvoltage of the thread are displayed. However, no analog or digital measurements can be derived.
    A similar technique has become known with the subject matter of DE 3 406 761 C2. There, the needle thread is guided starting from a yarn delivery via a bent wire bow, which is designed as a one-armed lever which is pivotally mounted in a pivot bearing.
    The pivotal position of the scanning lever varies depending on the thread tension, wherein the pivoting movement is converted into the rotational movement of a switching cam, the spring-loaded pivoted in a certain position and thus closes an electrical contact via a contact tongue. Thus, only one thread undervoltage is displayed.
    In this known device, the disadvantage is that only a single value is detected, namely a threshold value for the needle thread undervoltage.
    An identical prior art results from the subject matter of DE 2 310 262 A1 and the local FIG. 2. The needle thread is spring loaded a bracket, the pivoting movement of the tension of the needle thread is dependent and detects the only value of an undervoltage.
    In shuttle embroidery machines today each embroidery point is monitored for thread breaks, this is an electrical monitoring device of the needle threads, the so-called thread monitor. However, only two states can be detected: thread in order / thread broken. Thus, only these two states can be detected or displayed, and only after a few stitches after the thread break has already happened. A display is made sector by sector via signal lamps or on the control unit or on Pentamat machines at the thread monitor via LEDs, but in all cases only on the needle side.
    Prior art (prior art)
    In a yarn breakage of the needle and shuttle thread an electrical contact is made, a visual indicator lights, an audible signal is triggered and the machines shut down. The optical display shows in which machine area the thread break has occurred. While the needle thread is being monitored directly, a shuttle thread break will not be registered and displayed until no more entanglement occurs and the needle thread loosens. This monitoring works digitally, that is, it recognizes only "thread there" or "thread broken".
    The invention is therefore the object of developing a shuttle embroidery machine with measuring device so that not only the thread tension is monitored, but that a real measurement of the thread tension takes place.
    To solve the problem, the invention is characterized by the technical features of the current claim 1.
    A method suitable for this purpose is also claimed.
    In the invention, the thread tension of the respective needle thread can be measured at each embroidery point. Thus, it is possible to detect not only a digital signal ("thread there" / "thread broken"), but to measure the entire thread tension course over the embroidery process.
    In the present concept, in a first preferred embodiment, the needle thread is guided by 180 ° about a soft bending lamella, on this lamella is a permanent magnet, with respect to this magnet, a Hall sensor. A change in the thread tension causes the lamella to bend, thus changing the distance between the permanent magnet and the Hall sensor. This change in distance causes a magnetic field change, which can now be converted into a thread tension change.
    Resulting advantages / novelties over the state of the art
    [0015]The thread tension of the needle thread is measured.The thread tension measurement takes place at each embroidery point.The thread tension measurement takes place via a spiral spring (lamella).The thread tension can be measured throughout the embroidery process.It can be predicted in advance a possible thread break (increasing thread tension).With the currently measured thread tension can be intervened directly in the embroidery process.By comparing the current with a stored example in a library thread tension could be intervened in the embroidery process to prevent yarn breaks or to influence the embroidery image.
    Characteristic of the present invention is therefore a measuring method which performs a non-contact measurement of the thread tension on the needle thread side.
    For this purpose, various devices are claimed, all falling within the scope of the present invention.
    In a first embodiment of the invention, it is contemplated that the needle thread wraps around a cantilevered bending beam to form a thread loop, namely the upper free bendable end, so as to achieve a deflection of cantilevered bending beam according to the thread tension.
    The deflection of the cantilevered cantilever is preferably detected by a non-contact measuring method, wherein a known Hall sensor is used. Such a Hall sensor consists of a proximity sensor, which is arranged on the measurement side in the vicinity or on the machine frame, and of a magnet, which is arranged on the bending beam at the free bendable end.
    Instead of such a Hall sensor, other known, non-contact sensors may be used, such as optical sensors that perform a distance measurement with LED or laser, capacitive sensors, ultrasonic sensors, inductive sensors and the like.
    The measuring arrangement should be suitable to detect changes in the bending of the bending beam in the range of a few millimeters.
    However, it is suitable to detect deflections in the range of hundredths of a millimeter in order to achieve the most accurate measurement of the thread tension.
    In addition to the aforementioned non-contact, working with electronic or electrical sensors arrangements so-called air gap measuring devices are provided in the context of the present invention, which detect the position of a thread in an air gap in dependence on the strength of the air flow.
    The strength of the air flow is therefore a measure of the deflection of the bending beam.
    In addition to the non-contact measuring devices are of course provided in the context of the present invention, all touching working measuring devices, such as slide potentiometer, rotary potentiometer, scanning. In this category also include pressure measuring elements, such as piezoelectric pressure sensors or the like, which detect a pressure on a fixed bending beam - preferably at the clamping point - to achieve such a statement about the thread tension.
    The present invention is not limited to cantilever bending beam whose deflection is detected against the spring force of the bending beam, but also to rigid pivoting lever, which are designed as a measuring lever. Here, there is the possibility of a rigid, non-deflectable lever spring-loaded in a pivot bearing to arrange on one side pivotally, and to detect the deflection of the measuring lever against an elastomeric element or a force accumulator.
    Instead of a one-armed rigid measuring lever and a two-armed measuring lever can be used, whose central axis is designed as a pivot bearing.
    The use of a two-armed lever has the advantage that a greater sensitivity of the measuring arrangement can be achieved, because according to the law of levers a very small pivoting of a lever arm can be converted into a large pivoting of the other lever arm at the opposite end, whereby the sensitivity the measuring arrangement is significantly increased.
    Important in the invention is that the detected measurement result is used for the diagnosis of operating conditions. Of particular advantage is that although the measurement takes place on the needle thread side, but that can be closed by the detection of the thread tension on the needle thread side on the state on the opposite side (shuttle thread).
    This can be made with a single measurement on the needle thread side a comprehensive diagnosis of the respective embroidery site.
    It is preferred if the inventive measuring device is arranged per embroidery site. However, the invention is not limited thereto. It can also be provided that only every tenth or twentieth embroidery point is equipped with such a measuring device.
    In some applications, it may also be sufficient to equip even a single embroidery point for a large industrial embroidery machine with an inventive measuring device for detecting the needle thread tension.
    In a preferred embodiment of the invention it is provided that a Referenzstickstelle with the inventive measuring device is arranged on the embroidery machine, but that the other embroidery sites are equipped only with the conventional thread guards.
    This has the advantage that one obtains a statement about all Nadelfadenzustände only about a single Referenzstickstelle because all other embroidery sites are equipped with the same needle threads and it is sufficient to allow the measurement at a single embroidery point.
    However, the invention is not limited thereto. It remains completely open whether each embroidery site or any number of embroidery sites or only a single be equipped with the inventive measuring device.
    With the detection of the thread tension on the needle thread side different operating states of the embroidery point can be detected, namely
    1. Detection of the maximum thread tension, which depends on the thread delivery. Thus, over the detection of the first maximum of the yarn tension curve over time, the yarn delivery can be monitored and also regulated. According to this detected measured value of the maximum, from the position of which the time of loop read-out can be determined, the yarn delivery can thus be regulated.
    2. In the thread tension measurement as a function of time results after paragraph 1, a second maximum of the yarn tension curve on the needle thread side, which maximum is characterized by the thread tension at the time of the thread suit.
    The thread suit is the point when the looping is completed on the fabric, so as to form a fixed stitch node.
    If the measured value of the second maximum is disturbed, for example, if it is too high or too low, this can be explained by the quality of the embroidery knot on the fabric bottom.
    Likewise, the advantage achieved by the inventive measurement of the thread tension on the needle thread side, that the time interval between the first yarn tension maximum and the second yarn tension maximum for diagnostic purposes at the embroidery point is used.
    That is, if the first yarn tension maximum shifts to the left in the direction of the intersection of the coordinate system, this means that the boat will pick up the loop too early.
    If the first yarn tension maximum shifts to the right, towards higher time values, this means that the boat is reading the loop too late.
    The same applies to a time diagnosis with respect to the displacement of the second yarn tension maximum.
    If this second yarn tension maximum shifts in the direction of lower time values, this means that the yarn guide performs the suit of the embroidery thread on the embroidery floor too early, while when the time of the second maximum shifts in the direction of higher times, this is an indication this is because the thread guide makes the embroidery knot late on the embroidery floor.
    3. In one embodiment of the invention, it is provided to control the shape of the yarn tension curve on the needle thread side and monitor. If it turns out that the first maximum is not reached, but remains in the form of a flattened curve far below the maximum value, this means a fallen stitch, which means that the boat has not passed through the loop.
    Likewise, with the invention, a shuttle thread break can be found on the needle thread side, namely, if the second maximum thread tension fails and instead a flat sloping curve is detected, this means that on the shuttle side no thread is present.
    4. Furthermore, the invention can of course also recognize a thread break, because then the thread tension is zero and can no longer be detected.
    5. Furthermore, it can be determined in the case of an elevation of the first maximum that this represents an interference curve of the needle thread tension.
    If such a disturbance curve detected, this means a risk for the embroidery point, because with repeated detection must be assumed that the needle thread breaks in the near future.
    With the monitoring of the maximum thread tension and / or the detection of a possible increase in the thread tension, which is undesirable, trends can also be determined. This means that if increasing peaks of the first maximum are detected in ascending order, soon, for example after ten stitches or more, a thread break can be expected.
    If such trends or measurement results go beyond the intended course, an associated control is used to avoid overvoltages at the embroidery sites concerned.
    Accordingly, the Schiffchenzeit (that is the position of the shuttle in the Schiffchenlaufbahn) is regulated.
    The Schiffchenzeit is the lead or lag the shuttle with respect to a desired position.
    This also applies to the thread guide, which can be controlled in the same manner in its movement, in dependence on the thread tension.
    Likewise, the thread delivery can be regulated in dependence on the thread tension.
    The term "control" is always understood that the measured value of the thread tension detected here is detected according to the timing diagram to be described later at a certain point, and is compared with a target value. The detected value of the thread tension is fed as an actual value in a control, so as to achieve a controlled state of the respective element in the context of a controlled system.
    The subject of the present invention results not only from the subject matter of the individual claims, but also from the combination of the individual claims with each other.
    All in the documents, including the summary disclosed disclosures and features, in particular the spatial design shown in the drawings, are claimed as essential to the invention, as far as they are new individually or in combination over the prior art.
    As far as individual items are designated as "essential to the invention" or "important", this does not mean that these items necessarily have to form the subject of an independent claim. This is determined solely by the current version of the independent claim.
    In the following the invention will be explained in more detail with reference to drawings showing only one embodiment. Here are from the drawings and their description further features essential to the invention and advantages of the invention.
    In the drawings:<Tb> FIG. 1: <SEP> schematizes the representation of the thread guide on the needle thread side<Tb> FIG. 2: <SEP> the perspective view of a measuring module with a number of measuring devices arranged thereon<Tb> FIG. 3: <SEP> is a side view of a preferred embodiment of the measuring device<Tb> FIG. 4: <SEP> schematizes the front view of the bending blade used in FIG<Tb> FIG. 5: <SEP> an embodiment with respect to FIGS. 3 and 4 modified with a non-bendable measuring lever<Tb> FIG. 6: <SEP> an embodiment modified in comparison to FIG. 5<Tb> FIG. 7: <SEP> an embodiment with respect to FIGS. 5 and 6 modified<Tb> FIG. 8: <SEP> the thread tension diagram on the needle thread side in a time chart
    Fig. 1 shows schematically the needle side 1 of a shuttle embroidery machine, such shuttle embroidery machines are described in a variety of going back to the same applicant patent applications. Reference is made to the descriptions of these prior art patent applications.
    The needle side 1 consists essentially of a needle thread 2, which is received in the direction of arrow 3 by a yarn package via a yarn feeder 4.
    The yarn feeder 4 consists of a drive wheel 5, which is opposite to a non-driven counter wheel 6, wherein the needle thread 2 is conveyed through the gap between the two wheels 5, 6.
    The counter-wheel 6 is formed as a one-sided pivotable lever and pivotally mounted in a housing 7, so that it can be easily lifted from the drive wheel 5.
    Below the housing 7, a holder 14 is provided which is fixedly connected to the machine frame, and which also has a holding plate 13, among other things.
    The supplied by the yarn feeder 4 in the direction of the needle 22 needle thread 2 first passes as a thread section 2a to the inventive measuring device 11, where it is deflected as a thread loop 19 by 180 degrees, and as a thread line 2b back in the direction of arrow 17 to a Thread guide 8 is guided.
    The initial needle thread 2 is thus first supplied in the direction of arrow 16 of the measuring device 11, where it forms a thread loop 19 in the measuring device 11, which leads to a deflection or pivoting of the measuring element or to a pressurization or to a displacement, then after formation the thread loop 19 as a thread path 2b in the direction of arrow 17 to arrive at a thread guide 8 which is received in a pivot bearing 9 and which forms an eyelet 10 at its upper free end, about which the needle thread is again guided around 180 degrees to form a loop, and as the yarn path 2c now passes in the direction of arrow 18 on the measuring device 11, and the needle 22 is fed in the direction of arrow 18.
    Beyond the measuring device 11, a thread guide 26 is still provided according to FIG. 2, which serves to align the thread section 2 c of the needle thread 2. In the area of this thread guide 26 an additional thread breakage monitoring could take place.
    According to FIG. 2, the measuring device 11 is covered on the upper side by a cover 12.
    On the needle side, the needle 22 is replaceably mounted in a needle carrier 21, which in turn is received in a needle holder 20.
    Below and parallel to the needle 22, a drill 24 is arranged.
    Incidentally, the needle 22 forms a needle eye 23, through which the needle thread 2 is guided in a manner known per se.
    According to FIG. 2, the measuring device according to the invention is designed as a measuring module 25, wherein in the exemplary embodiment shown, each measuring point 11 is associated with such a measuring device 11. These are arranged parallel to each other on a beam-like support and at a mutual distance from one another, and only a simplified course of a needle thread is shown for the purpose of simplifying the drawing.
    It is also stated that in the intermediate space between the measuring device 11 and the eyelet 10 of the thread guide 8, a thread bundle 15 is guided, which - according to the above description - consists of the thread sections 2a, 2b and 2c of the needle thread 2.
    Figs. 3 and 4 show a preferred embodiment of a measuring device 11 according to the invention. This consists essentially of a housing 32 which is machine-fixed to the housing of the embroidery machine, and which carries in its lower region a retaining screw 31, whose head is clamped against the lower free end of a flexible blade 28.
    The retaining screw 31 is provided on the opposite side with a clamping nut 33 and so firmly connected to the housing 32, wherein in the space with spacing a spacer 34 is clamped, which consists essentially of a hammerhead-shaped end, the front and top free End is designed as a stop 35 for the flexible blade 28.
    Opposite to the stop 35, a centering 36 is provided, which is accommodated in the housing 32.
    At the upper end of the housing 32, a measuring sensor 62 is arranged, which preferably detects without contact the measuring distance 38 between an opposing counter-element 37, which is arranged at the free bendable end of the blade 28.
    Fig. 3 shows in dashed lines the deflection of the blade 28, which is thus clamped with its lower end in a clamping point 30, wherein the clamping point 30 is formed by the retaining screw 31.
    According to FIG. 3, the needle thread 2 is guided in the region of its thread section 2a, 2b as a thread loop 19 which deflects by 180 degrees about a constriction 29 at the upper free end of the lamella 28, wherein the lamella head 27 indicated there consists of the material of the lamella 28, and in this embodiment, a deflection is provided with the application of friction.
    This means that the lamella head 27 - because it is made of the same material as the remaining material of the blade 28 - is particularly light, and is well deflected.
    The natural frequency of the bending of the blade 28 should deviate as far as possible from the frequency of the needle thread tension, in order to obtain no superpositions of both frequencies. For this reason, the fin head 27 is particularly lightweight.
    In another embodiment of the invention may of course be provided that instead of the friction deflection and rolling elements for the deflection of the thread loop 19 are provided. Likewise, it is provided that the constriction 29 or overall the lamella head 27 is provided with friction-reduced coatings, such as ceramic coatings and the like.
    5 to 7 show modifications of the measuring principle according to FIGS. 3 and 4, wherein in FIG. 5 as a first example, a non-flexible measuring lever 39 is indicated as a one-armed lever, which is accommodated in a pivot bearing 40. He is therefore pivotally mounted in the pivoting direction 41 in the pivot bearing and is held by a spring member not shown in detail spring-loaded in its rest position. Such a biasing member may be an elastomeric spring, a coil spring, a leg spring or any other energy storage.
    In the embodiment shown, therefore, the measuring lever 39 is pivoted into the position of the measuring lever 39, and thus the counter-element 37 is pivoted about the measuring distance 38 on the measuring sensor 62 arranged opposite.
    A similar principle shows the principle of FIG. 6, where instead of a one-armed measuring lever, a two-armed measuring lever 39a, 39b is used, which is pivotable about a pivot bearing 40.
    One measuring lever part 39a serves to form the thread loop 19 for the needle thread 2, while the counter element 37, which cooperates with the measuring sensor 62 (not shown), is arranged on the opposite measuring lever 39b.
    The use of such a two-armed measuring lever has the advantage that a relatively small deflection on the side of the thread loop 19 in a larger deflection of the counter-element 37 can be implemented according to the lever ratios.
    5 shows that the spring load can not only be present in the pivot bearing 40, but also by a separate spring 42 is formed, which extends with its other end to the retaining plate 13 or another machine-fixed part is supported.
    Of course, any other known energy storage can be used instead of the spring 42.
    FIG. 8 now shows a typical yarn tension curve over time, wherein the ordinate represents the yarn tension and the time axis indicates a time in milliseconds.
    In the region of the repetition point 50, the entire course of the thread tension is repeated, it being assumed that a speed of the embroidery machine of 600 revolutions per minute.
    It goes without saying that according to the speed of the embroidery machine, the repetition point 50 shifts by a certain period.
    The specified repetition point with a time of 100 milliseconds is therefore to be understood as exemplary only and does not limit the invention in any way.
    Starting from the zero point of the coordinate system thus begins the thread tension at position 43 with a certain initial value and thus passes through the Kurvenast 44 in the formation of the thread loop.
    The cam follower 44 rises as a steeply rising curve up to a first maximum 45 and drops sharply there in the direction of the arrow in the manner of the indicated curve branch 46.
    In the first maximum 45 thus the maximum thread tension is reached, which then sets when the loop is picked up by the shuttle.
    If this first maximum changes in the direction of maximum values, as entered with the curve branch 56, then this means an interference curve, because then the needle thread tension is too high.
    If such an excessive curved load 56 occurs, it is thus possible to intervene as the actual value in a control for the yarn feeder 4 with this measured value thus acquired.
    Likewise, the thread guide 8 can be controlled with such a measured value as the desired value.
    After passing through the descending curve branch 46, the normal thread tension curve, forming a turning eyelet 47, reaches a second maximum 48, which describes the thread tension at the time of the thread take-up.
    The thread suit is the thread tension required to attract the embroidery knit at the embroidery bottom.
    If at this second maximum 48 an elevation of this second maximum in the direction of excessive maximum values occurs, this is an indication that the thread tightening is too strong.
    Thus, the embroidery image is changed disadvantageously.
    Also, this measured value in the second maximum 48 is thus used for a control of the associated units, such as the control and / or control of the yarn feeder 4 and / or the thread guide. 8
    After overcoming the second maximum 48, the thread tension passes into a sloping curve branch 49 and then passes to the repetition point 50, from which the entire yarn tension diagram according to FIG. 8 is repeated.
    In the following, some further disturbance curves are described, which can arise during the detection of the thread tension on the needle thread side and which can be avoided with the method according to the invention.
    It may happen that the first maximum 45 is not reached and instead a flattened maximum 45a is traversed, which speaks for an erroneous reading of the loops.
    When such a curve 45a is detected, a suitable countermeasure is taken.
    Thus, there is a first curve branch 51 which generates the unwanted low maximum value 45a as a disturbance curve, and this curve branch 51 then re-branches into the normal turning branch 47 in a branch 53, so that the detection of the disturbance curve 51 will diagnose an erroneous loop read-out can be.
    There is another accident that is expressed in the course of the curve branch 44. Starting from the branch 53, the normal turning branch 47 is not traversed, but instead a downwardly directed curved branch 54 is formed, which points to a shuttle breaking.
    In this way it is shown that with the detection of the thread tension on the needle thread side beyond the state of the shuttle thread can be monitored.
    Finally, the cam branch 55 running on the zero line points to a complete needle thread breakage, which likewise represents an interference curve.
    The time conditions for the various thread tension parameters will now be described.
    Namely, if the first maximum 45 is not reached in the time axis 57 at the time t1, it may happen that the time t1 is shifted to the left in the arrow direction 58, which refers to too early movement of the shuttle in the direction of the thread loop ,
    Likewise, as a further disturbance curve, the time characteristic of the time t1 is to be evaluated, which is shifted to the right in the direction of longer times in the direction of arrow 59, which indicates too late movement of the shuttle in the direction of the thread loop.
    Similarly, it is indicated with respect to the second maximum 48, that at time t2, a left shift of this time in the direction of arrow 60 indicates a too early threadline, while a rightward shift in the direction of arrow 61 indicates a delayed movement initiation of the thread guide 8.
    The invention is not limited to arranging the measuring device at the described and drawn locations on the embroidery machine, but this measuring device can be located somewhere in the threadline (2). That the measuring device could also be arranged in a different yarn path outside the yarn path (2a, 2b, 2c).
    Overall, therefore, with the inventive measuring device and the associated method, a comprehensive diagnosis of the thread tension on the needle thread side, but also the state parameter on the Schiffchenseite be detected, which was not the case in the prior art.
    drawing Legend
    [0122]<Tb> 1 <September> needle side<Tb> 2 <September> needle thread<Tb> 2 <September> string line<Tb> 2b <September> string line<Tb> 2c <September> string line<Tb> 3 <September> arrow<Tb> 4 <September> feeders<Tb> 5 <September> Sprockets<Tb> 6 <September> mating<tb> 7 <SEP> Case (for 6)<Tb> 8 <September> thread guide<Tb> 9 <September> pivot bearings<Tb> 10 <September> eyelet<Tb> 11 <September> measuring device<Tb> 12 <September> cover<Tb> 13 <September> Halteblech<Tb> 14 <September> Holder<Tb> 15 <September> thread bundle<Tb> 16 <September> arrow<Tb> 17 <September> arrow<Tb> 18 <September> arrow<Tb> 19 <September> thread loop<Tb> 20 <September> needle holder<Tb> 21 <September> needle carrier<Tb> 22 <September> Needle<Tb> 23 <September> needle eye<Tb> 24 <September> Drills<Tb> 25 <September> measuring module<Tb> 26 <September> thread guide<Tb> 27 <September> fins head<tb> 28 <SEP> Slat 28<Tb> 29 <September> constriction<Tb> 30 <September> clamping<Tb> 31 <September> retaining screw<Tb> 32 <September> Housing<Tb> 33 <September> clamping nut<Tb> 34 <September> spacer<tb> 35 <SEP> stroke (of 34)<Tb> 36 <September> centering<tb> 37 <SEP> counter element 37<Tb> 38 <September> measuring distance<tb> 39 <SEP> Lever 39, 39a, 39b<Tb> 40 <September> pivot bearings<Tb> 41 <September> arrow<Tb> 42 <September> Spring<Tb> 43 <September> Position<Tb> 44 <September> curve branch<tb> 45 <SEP> first maximum (loop read)<Tb> 46 <September> curve branch<Tb> 47 <September> Wend East<tb> 48 <SEP> second maximum (threading)<Tb> 49 <September> curve branch<Tb> 50 <September> repeating point<tb> 51 <SEP> Curve branch (disturbance curve)<Tb> 52 <September><Tb> 53 <September> branch<tb> 54 <SEP> Curve branch (shuttle breakage)<tb> 55 <SEP> Cam Branch (Needle Thread Break)<tb> 56 <SEP> Curve load (distortion curve needle thread tension too high)<Tb> 57 <September> Timeline<tb> 58 <SEP> Direction of arrow (boat too early)<tb> 59 <SEP> Arrow direction (boat too late)<tb> 60 <SEP> Arrow direction (thread guide too early)<tb> 61 <SEP> arrow direction (thread guide too late)<Tb> 62 <September> measuring sensor
    权利要求:
    Claims (10)
    [1]
    1. shuttle embroidery machine with a measuring device for monitoring the thread tension of the needle thread (2), characterized in that the needle thread (2) to form a thread loop (19) spans the free end of a measuring lever (28, 39), the deflection of the type analogous Measurements can be detected metrologically.
    [2]
    2. shuttle embroidery machine according to claim 1, characterized in that the measuring lever is designed as a flexurally soft, one-sided clamped blade (28).
    [3]
    3. shuttle embroidery machine according to claim 1, characterized in that the measuring lever (39) is designed as a spring-loaded, pivotally mounted one or two-armed lever.
    [4]
    4. shuttle embroidery machine according to one of claims 1 to 3, characterized in that the thread tension-induced deflection of the measuring lever (28, 39) is detected without contact.
    [5]
    5. shuttle embroidery machine according to one of claims 1 to 3, characterized in that the thread tension-induced deflection of the measuring lever (28, 39) with a touching working measuring device, e.g. Pressure measuring devices, is detectable.
    [6]
    6. A method for operating a measuring device on a shuttle embroidery machine with a detection of the needle thread tension, characterized in that the detected measurement result for the diagnosis of operating conditions of the embroidery point on the needle thread side and / or the shuttle thread side is used.
    [7]
    7. The method according to claim 6, characterized in that in response to the detection of the needle thread tension at a certain time of stitch formation of at least one of the following parameters is detected:a) detection of the maximum thread tension in the first maximum of the course of the thread tension over the time of stitch formationand orb) detection of the maximum thread tension in the second maximum of the course of the thread tension over the time of stitch formationand orc) detecting the time interval between the first yarn tension maximum and the second yarn tension maximumand ord) detection of the shape of the yarn tension curve
    [8]
    8. The method according to claim 7, characterized in that in the detection of the shape of the yarn tension curve in the first yarn tension maximum a fault diagnosis (fallen stitch) takes place upon detection of a flattened curve.
    [9]
    9. The method of claim 7 or 8, characterized in that when detecting the shape of the yarn tension curve in the second yarn tension maximum a fault diagnosis (shuttle thread break) takes place upon detection of a flattened curve.
    [10]
    10. The method according to any one of claims 7 to 9, characterized in that in the detection of the thread tension with the value 0 or almost 0, a needle thread break is diagnosed.
    类似技术:
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    同族专利:
    公开号 | 公开日
    DE102015008675A1|2017-01-05|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    CH165790A|1932-11-09|1933-12-15|Reichenbach & Co S A|Thread roller for shuttle embroidery machines.|
    DE2310262A1|1972-03-03|1973-09-06|Matalmeccanica S P A|Determination of thread breakage - partic for embroidering machine with automatic colour change|
    DD213705A1|1983-02-23|1984-09-19|Plauener Spitze Veb|THREAD TENSIONING AND WEARING DEVICE FOR EMBROIDERY MACHINES|
    CH658477A5|1983-03-21|1986-11-14|Saurer Ag Adolph|NEEDLE THREAD FOR EMBROIDERY MACHINES.|
    DE3839733C2|1988-11-24|1993-12-09|Pfaff Ag G M|Stitch-forming machine with a sensor|
    DE10130345A1|2001-06-27|2003-01-09|Zsk Stickmasch Gmbh|Depending on the thread tension controlled thread drive mechanism|
    法律状态:
    2018-05-31| PK| Correction|Free format text: BERICHTIGUNG INHABER Free format text: BERICHTIGUNG ERFINDER |
    2020-05-29| AZW| Rejection (application)|
    优先权:
    申请号 | 申请日 | 专利标题
    DE102015008675.8A|DE102015008675A1|2015-07-04|2015-07-04|Shuttle embroidery machine with measuring device for monitoring the thread tension of the needle thread and method therefor|
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