• 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 detection of the shuttle thread breakage by checking for the presence of thread tension in the needle thread by a thread monitor (20) on the needle thread side, with at least one thread guide (15) deflecting the needle thread and one thread guide (15) starting from the needle eye (10) of an embroidery needle (8) during the course of the needle thread Thread bobbin (28) delivering needle thread are arranged, the thread monitor (20) being arranged in a first thread center (13a, 13b) between the needle eye (10) of the embroidery needle (8) and the thread guide (15).
    公开号:CH711530B1
    申请号:CH01053/16
    申请日:2016-08-15
    公开日:2020-10-15
    发明作者:Friedrich Gerardo；Ulmann Andreas；Hilpertshauser Adrian
    申请人:Saurer Ag；
    IPC主号:
    专利说明:

    The subject of the invention is a shuttle embroidery machine with detection of a shuttle thread breakage according to the preamble of claim 1.
    The thread run of today's shuttle embroidery machines is chosen so that an optimal mechanical-geometric arrangement is achieved between the thread-guiding elements. However, this arrangement has the result that the thread tension on the needle thread side, which the thread monitor sees, is falsified by several strong deflections. Thus, the thread tension differences in the case of a boat thread breakage are very small and difficult to recognize. As a rule, this behavior leads to very complex setting work on the machine control, which, if not carried out correctly and precisely, leads to major embroidery errors.
    Shuttle embroidery machines are usually equipped with sensors, so-called thread monitors, to ensure that the embroidery process is stopped when a shuttle or needle thread is not available. The majority of these thread monitors are located on the needle side, although there are also versions where there is an additional thread monitor on the shuttle side to monitor the shuttle thread. The latter is not always reliable, which is why the machine manufacturers have implemented a shuttle thread break detection with the thread monitor on the needle side. While this method gives better results, it is also not always reliable.
    The invention is therefore based on the object of developing a shuttle embroidery machine of the type mentioned in such a way that a break in the shuttle thread can be detected more reliably on the side of the needle thread.
    To solve the problem, the invention is characterized by the technical teaching of claim 1.
    The present invention solves the problem by changing the thread path on the needle thread side so that a significantly higher detection sensitivity to a shuttle thread breakage is achieved on the needle thread side.
    After intensive research, it has been shown that a change in the arrangement of the needle thread-side thread monitor leads to a significant improvement in detection sensitivity when the number of deflections from the stick bottom to the thread monitor is reduced. Thread tension measurements show a greater difference between the normal and faulty state, which is used in the present invention to detect the detection of the thread breakage. At the same time, this also improves the detection of the needle thread breakage.
    The feature of the invention is that, starting from the stick bottom, the thread monitor is moved into the course of the first thread center on the needle thread side. It is therefore located in a thread center next to the embroidery needle, without thread deflections recognized as undesirable - e.g. a thread guide - are arranged in this thread center in front of the thread monitor in the direction of the embroidery needle.
    The needle thread-side thread path of a shuttle embroidery machine is essentially defined by several deflection lines, starting from the embroidery needle a first thread center is defined, which goes from the embroidery needle via one or more deflection elements to the thread monitor. According to the invention, the thread monitor is accordingly switched on directly downstream of the embroidery needle - that is, directly in front of the embroidery needle - in the thread path and not - as in the prior art - in front of the thread guide. However, the term “directly in front of the embroidery needle” does not exclude the fact that guide and deflection elements are still arranged together with the thread monitor in the area of the first thread center. The thread guide should just not be arranged in this first thread center in front of the thread monitor in the direction of the embroidery needle.
    In the prior art it has been shown that if the thread monitor is moved in front of the thread guide in the direction of the thread bobbin, then several and undesirably many deflection points are given between the thread monitor and the embroidery needle, especially those of the thread guide, which the Adversely affect the detection of the thread tension decreasing in a temporal observation window.
    Each deflection, which is arranged in the prior art beyond the thread monitor in the direction of the embroidery needle, leads to a poorly detectable thread tension curve in the case of the shuttle thread breakage, which the thread monitor erroneously indicates a still existing shuttle thread.
    This is an error that could not be controlled in the prior art; the embroidery machine continued to embroider due to the incorrect display of the thread monitor, which caused large holes in the embroidery image.
    This is where the invention comes in, which now provides an improved needle thread-side thread tension detection in such a way that as few deflection points as possible between the thread monitor and the embroidery needle are arranged in the needle thread-side thread path, so that if the shuttle thread is omitted due to a break in the shuttle thread, the The thread tension on the needle thread side immediately drops to a minimum and is established as a straight line over a defined observation window.
    In the prior art, this could not be achieved because of the large number of deflection points between the thread monitor and the embroidery needle. Here, the thread tension formed an undesirable thread tension maximum when the shuttle thread broke, which the thread monitor showed that the shuttle thread was present, which in reality was no longer there.
    [0015] Accordingly, the invention results in improved detection when the shuttle thread breaks, in that the thread tension on the needle thread side can be monitored and detected more smoothly.
    In the following the invention is explained in more detail with reference to drawings showing only one embodiment. Further features and advantages of the invention that are essential to the invention emerge from the drawings and their description.
    [0017] They show:<tb> <SEP> Figure 1: Schematic representation of the thread path on the needle thread side according to the prior art<tb> <SEP> Figure 2: the modification of the needle-thread-side thread run according to the invention<tb> <SEP> FIG. 3: an illustration of the principle according to FIG. 2 with the illustration of further structural details<tb> <SEP> Figure 4: schematically shows a side view of a thread monitor<tb> <SEP> Figure 5: the top view of a constructive embodiment of the thread run on the needle thread side on a shuttle embroidery machine<tb> <SEP> Figure 6: the representation of the thread tension over the cycle time of the knot tying<tb> <SEP> FIG. 7: schematizes the principle according to the invention
    In Figures 1 and 2, the needle thread-side thread line 1 is shown, according to Figure 1 according to the prior art and according to Figure 2 according to a first preferred embodiment of the invention.
    In the area of a shuttle path 2, the shuttle 3 is driven displaceably in the directions of arrows 4 and 5 in a manner known per se, and the shuttle thread 6 is guided towards the embroidery needle 8 to form the embroidery knot 11.
    Beyond the embroidery needle 8, a throat plate 7 is arranged, and the embroidery needle 8 is arranged with its needle eye 10 in front of the throat plate 7.
    The embroidery needle 8 is guided in a known guide element 9 in the longitudinal direction; and the needle thread 12, which is supplied from a thread spool 28, passes through the guide element 9 and forms a first thread center 13, which is defined in such a way that it extends from the needle eye 10 of the embroidery needle 8 to a thread conductor 15.
    According to the prior art, the thread guide 15 is part of the first thread center 13.
    In a manner known per se, the needle thread 12 is moved forwards and backwards in oscillating thread movement directions 35, but the movement in the direction of the needle eye 10 outweighs the movements in the opposite direction.
    The thread conductor 15 is a compensating element which works with a deflection 17 and is driven displaceably in the directions of the arrows 16. Its task is to pull the needle thread 12 back again after the loop formation and to tighten the stitch knot 11.
    Beyond the deflection 17 on the thread guide 15, it is known in the prior art to form a second thread center 18 of the needle thread 12, which runs into a thread monitor 20 via a deflection element 19.
    In a known embodiment, the thread monitor 20 includes a measuring element 21 which can be raised and lowered in the arrow directions 22 due to the thread tension applied there, this measuring element 21 forming a further deflection 23 for the needle thread according to the prior art.
    After passing through the thread monitor 20, the needle thread forms a third thread center 24 which extends from the inlet of the thread monitor 20 to a deflection 26 which forms the thread feeder 25.
    A fourth thread center 27 is formed on the thread feeder 25 and extends as far as the thread spool 28.
    From the schematic figure 1 according to the prior art it becomes clear that if the shuttle thread 6 breaks due to the deflection points 19, 15, 14, 9, a lot of friction-increasing elements affect the thread-side thread path in the direction of the embroidery needle 8, so that if broken of the shuttle thread 6, a change in tension in the shuttle thread 6 is very difficult to determine.
    Due to the friction-increasing deflection points of the eye of the needle 10, guide element 9, guide element 14 and thread conductor 15 with the deflection 17 formed there and the further deflection element 19 at the inlet of the thread monitor 20, therefore, only breaks of the shuttle thread in the thread tension of the needle thread with a great delay or at all not detectable.
    [0031] It is therefore disadvantageous in the prior art that a break in the shuttle thread is only recognized uncertainly or not at all.
    This is where the invention comes in, which has recognized for the first time that the deflection points from the thread monitor 20 in the direction of the embroidery needle 8 must absolutely be minimized in order to achieve better detection of the thread tension.
    This is shown in FIG. FIG. 2 shows the same elements as in FIG. 1 according to the prior art, the same explanation also applying to the same elements.
    The decisive factor in the invention is that the thread monitor 20 is arranged in the area of the first thread center 13, that is, in the course of the needle thread 12 between the embroidery needle 8 and the thread guide 15, and no longer - as in the prior art - after the thread guide 15, as shown in FIG.
    The invention accordingly provides that the thread monitor 20 is arranged upstream of the thread guide 15 in the direction of the embroidery needle 8, so that only a few deflection points between the embroidery needle 8 and the thread monitor 20 are present in the invention. A first deflection point 23 is arranged in the thread monitor 20, and a second deflection element 30 has only a small angle of wrap, the needle thread essentially running straight over the guide element 14 and only has to pass through the guide element 9 until it enters the needle eye 10.
    The friction-increasing thread guide according to the prior art has now been removed from the thread run on the needle thread side according to the invention and is connected downstream of the thread monitor 20. This is a significant advance, because it is clear from Figure 2 that the first thread center 13 in the invention is formed by a thread center 13a, which goes from the embroidery needle 8 to the inlet of the thread monitor 20 and an identical thread center 13b from the outlet of the thread monitor 20 extends to the thread guide 15.
    It is not absolutely necessary for the solution, but it can be provided that a further deflecting element 29 is arranged at the inlet of the thread guide 15, but this does not interfere with the needle thread-side thread path 1 according to the invention because this deflection element 29 is arranged downstream of the thread guide 15 and not upstream in the direction of the embroidery needle 8.
    In this way, significant improvements in the detection of a shuttle thread breakage are achieved.
    FIG. 3 shows a structural embodiment of the invention, where the same parts are provided with the same reference numerals.
    A cover 33 is shown on which the guide element 14 and the deflecting element 30 together with the thread monitor 20 are arranged.
    Separately from the cover 33, the needle carrier 32 is fastened together with a drill 31.
    At the inlet of the thread monitor 20, the first thread center 13b is formed and leads via the deflecting element 29 to the thread guide 15. There the needle thread is deflected, as will be explained later with reference to FIG.
    At the outlet of the thread guide 15, the thread feeder 25 is arranged. The thread spool 28 is not shown in FIG.
    Figure 4 shows a preferred embodiment of a thread monitor 20, but the invention is not limited. The invention provides all possibilities of thread tension measurement, whereby in the illustrated embodiment the thread tension measurement takes place in that a measuring element 21 in the form of a measuring roller or the like is mounted displaceably in the directions of arrows 22 in the area of a guide track 34, which is inclined at an angle, and a deflection 23 forms for the needle thread.
    The higher the thread tension, the more the measuring element 21 is raised in the guide track 34, and the displacement path of this measuring element 21 is electronically detected in a contactless manner.
    The invention is not limited to such an embodiment. All known thread monitors can be used, which in particular also provide a direct thread tension measurement by scanning the needle thread, or also by evaluating the expansion of strain gauges, non-contact measuring methods and optoelectronic measuring methods.
    In particular, thread monitors are known which derive the thread tension from the deflection of a spring element.
    The embodiment of Figure 4 is shown only as a preferred embodiment, but is not intended to restrict the invention in any way.
    FIG. 5 shows a structural embodiment of the embodiment according to FIG. 2, where it can be seen that the yarn feeders 25 are arranged next to one another in a large number of modules; and only for the sake of simpler description, the third thread center 24 is shown starting from a single thread feeder 25, which is deflected with multiple deflections between a deflection 17 and a deflection element 29.
    At the outlet of the deflecting element 29, the thread center 13b is thus formed, which enters the thread monitor 20 on the inlet side (see FIG. 4), and there, via the deflection 23, leaves the thread monitor 20 as a thread center 13a.
    At the outlet of the thread monitor 20, the deflecting element 30 is arranged, which feeds the first thread center 13a to the guide element 14, from which the needle thread is fed to the embroidery needle 8 via the guide element 9.
    FIG. 6 shows, in solid lines, a typical thread tension curve over the cycle of an embroidery knot formation, it being known that with an unbroken shuttle thread, a total of two thread tension maxima result on the needle thread side.
    Starting from time t0, a first tension maximum 37 results at time t1, which is caused by the needle thread forming a half-open loop being thrown off the back of the shuttle 3. After falling from the back of the shuttle, it is de-energized at time t2. The second tension maximum 38 is generated in that the embroidery knot 11 is tightened, which takes place at time t3.
    At the point in time t4, the minimum thread tension is reached, and a new cycle then begins.
    At the point in time t3, the thread guide 15 is completely withdrawn and thus pulls the embroidery knot 11 tight.
    The voltage maximum 38 then changes to a minimum at time t4.
    The observation window 39 for the thread monitor 20 is defined in the time span approximately between the time t2 and the time t4. This window is only used to monitor a shuttle thread break, the thread monitor 20 of course also detecting needle thread breaks, which, however, are detected in a differently positioned observation window.
    It is now important that the thread tension curve 36 according to the prior art forms an error curve 40 which, disadvantageously, simulates a tension maximum 42 for the thread monitor, although the shuttle thread has already broken.
    This maximum tension 42 of the needle thread 12 arises because between the thread monitor 20 and the embroidery needle 8 according to the prior art, a number of undesired deflection points are present which increase the friction of the needle thread and therefore prevent the shuttle thread from breaking The voltage curve in the observation window drops to a minimum.
    The tension maximum 42 according to the prior art is avoided according to the invention in that, according to the invention, fewer deflection points are now arranged beyond the thread conductor 15 in the direction of the embroidery needle 8, so that the incorrect tension maximum 42 is avoided. Rather, the invention provides an error curve 41 according to the invention, which immediately falls to a minimum as a straight line and can thus be easily recognized by the thread monitor 20.
    As already stated, the thread monitor could therefore not distinguish between the faulty tension maximum 42 according to the prior art and the usually present tension maximum 38, which has led to a large number of damage patterns in the formation of the embroidery pattern.
    According to the invention, this incorrect tension maximum 42 is avoided in the invention and instead a minimized error curve 41 is achieved due to the lower number of deflections of the needle thread between the thread monitor and the embroidery needle.
    FIG. 7 shows the principle according to the invention, where it can be seen that the thread monitor 20 could be arranged somewhere in the arrow directions 43, 44 in the space between the embroidery needle 8 and the thread conductor 15.
    In certain applications it can even be provided that the thread monitor 20 is arranged in the thread guide 15 itself, and there forms a deflection point.
    It is therefore not necessary for the solution that the first thread centers 13a, 13b are necessarily formed upstream and downstream of the thread monitor 20; it can also be provided that the thread center 13b disappears completely because the thread monitor 20 coincides with the thread guide 15.
    What happens on the other side of the thread monitor 15 in the direction of the thread bobbin 28 is no longer decisive for the detection of the thread tension curve 36 according to FIG. 6.
    A number of deflections can be provided there which do not affect the thread tension curve and, above all, have no effect on the thread tension when the shuttle thread breaks.
    Drawing legend
    1 thread run (needle thread side) 2 shuttle track 3 shuttle 4 arrow direction 5 arrow direction 6 shuttle thread 7 stitch plate 8 embroidery needle 9 guide element 10 needle eye 11 embroidery knot 12 needle thread 13 thread center (first) 14 guide element 15 thread guide 16 arrow direction 17 deflection (from 15) 18 thread center ( second) 19 deflection element 20 thread monitor 21 measuring element 22 arrow direction 23 deflection (from 22) 24 thread center (third) 25 thread feeder 26 deflection 27 thread center (fourth) 28 thread spool 29 deflection element 30 deflection element 31 drill 32 needle carrier 33 cover (for needle bed) 34 guide track 35 direction of thread movement 36 Thread tension curve 37 Tension maximum (1st) 38 Tension maximum (2nd) 39 Observation window 40 Error curve (state of the art) 41 Error curve (invention) 42 Tension maximum (state of the art) 43 Direction of arrow 44 Direction of arrow
    权利要求:
    Claims (4)
    [1]
    1. Shuttle embroidery machine with detection of the shuttle thread breakage by checking for the presence of thread tension in the needle thread (12) by a thread monitor (20) on the needle thread side, with at least one needle thread starting from the needle eye (10) of an embroidery needle (8) during the course of the needle thread (12) (12) deflecting thread guide (15) and a thread bobbin (28) delivering the needle thread (12) are arranged, characterized in that the thread monitor (20) is in a first thread center (13) between the needle eye (10) of the embroidery needle (8) and the Thread guide (15) is arranged.
    [2]
    2. Shuttle embroidery machine according to claim 1, characterized in that the first thread center (13) is formed by a first partial thread center (13a) which extends from the embroidery needle (8) to the outlet from the thread monitor (20) and through a second Part of the thread center (13b), which runs from the inlet in the thread monitor (20) to the thread guide (15).
    [3]
    3. Shuttle embroidery machine according to one of claims 1 to 2, characterized in that the test for the presence of thread tension in the needle thread is carried out in that an obliquely inclined guide track (34) is arranged in the housing of the thread monitor (20), in which a measuring element (21) is mounted displaceably in the form of a measuring roller and forms a deflection (23) for the needle thread, the displacement of the measuring element (21) being detected.
    [4]
    4. Shuttle embroidery machine according to one of Claims 1 to 3, characterized in that the thread monitor (20) is arranged in the space between the embroidery needle (8) and the thread guide (15).
    类似技术:
    公开号 | 公开日 | 专利标题
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    DE19856620A1|2000-06-15|Stitch-forming machine and method for detecting malfunctions
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    CH646397A5|1984-11-30|THREAD FEEDING DEVICE FOR INTERMITTENTLY FEEDING THREAD MATERIAL UNDER TENSION.
    WO2002052082A1|2002-07-04|Device for monitored delivery of warp threads to a weaving loom or a warp knitting loom
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    DE10224079B3|2004-03-25|Method and device for successively inserting weft threads into the shed of a weaving machine
    EP1350878A1|2003-10-08|Method for monitoring the weft thread in a loom
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    同族专利:
    公开号 | 公开日
    DE102015011682A1|2017-03-09|
    CH711530A2|2017-03-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    CH357955A|1956-11-26|1961-10-31|Schmid Arthur|Thread monitor on a stitch-forming machine equipped with a large number of needles, for example an embroidery machine, quilting machine and the like|
    AT244785T|1999-11-05|2003-07-15|Laesser Franz Ag|THREAD GUARD RAIL|
    DE10130345A1|2001-06-27|2003-01-09|Zsk Stickmasch Gmbh|Depending on the thread tension controlled thread drive mechanism|
    EP1489214B1|2003-06-16|2005-09-14|Franz Lässer AG|Thread stop motion device and bar|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102015011682.7A|DE102015011682A1|2015-09-05|2015-09-05|Shuttle embroidery machine with improved detection of shuttle breakage|
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