EP0445157B1 - Stichbildende maschine mit einem messwertaufnehmer und einer steuervorrichtung - Google Patents

Stichbildende maschine mit einem messwertaufnehmer und einer steuervorrichtung Download PDF

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Publication number
EP0445157B1
EP0445157B1 EP89912950A EP89912950A EP0445157B1 EP 0445157 B1 EP0445157 B1 EP 0445157B1 EP 89912950 A EP89912950 A EP 89912950A EP 89912950 A EP89912950 A EP 89912950A EP 0445157 B1 EP0445157 B1 EP 0445157B1
Authority
EP
European Patent Office
Prior art keywords
tension
stitch
thread
peak
transducer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89912950A
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German (de)
English (en)
French (fr)
Other versions
EP0445157A1 (de
Inventor
Erich Willenbacher
Bernhard Mertel
Rainer Spickermann
Walter Sinn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GM Pfaff AG
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GM Pfaff AG
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Filing date
Publication date
Application filed by GM Pfaff AG filed Critical GM Pfaff AG
Publication of EP0445157A1 publication Critical patent/EP0445157A1/de
Application granted granted Critical
Publication of EP0445157B1 publication Critical patent/EP0445157B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B51/00—Applications of needle-thread guards; Thread-break detectors
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B47/00—Needle-thread tensioning devices; Applications of tensometers
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B47/00—Needle-thread tensioning devices; Applications of tensometers
    • D05B47/06—Applications of tensometers
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2205/00—Interface between the operator and the machine
    • D05D2205/12—Machine to the operator; Alarms
    • D05D2205/16—Display arrangements

Definitions

  • the invention relates to a thread monitor according to the preamble of claim 1.
  • the thread monitor for displaying missing stitches is known.
  • the thread monitor arranged on a sewing machine in the path of the needle thread has a measuring sensor with a spring clip, to which a strain gauge element, hereinafter referred to as strain gauge element, is attached.
  • the strain gauge element generates an electrical voltage that is proportional to its mechanical deformation caused by the deflection movement of the spring clip.
  • the electrical voltage is fed to evaluation electronics connected downstream of the measuring sensor.
  • a first smaller voltage level is generated when the needle thread loop is widened and a second larger voltage level is generated during the knotting.
  • the voltage levels are monitored in measuring windows, the positioning and size of which are specified by two signal transmitters that monitor the position of the arm shaft.
  • a plurality of actual values is determined from the smaller voltage level and compared with a threshold value, the amount of which depends on the maximum value of the larger voltage level formed in the previous stitch. If all actual values fall below this threshold value, the evaluation electronics issue a warning signal to indicate a missing stitch.
  • the threshold value Since the maximum value of the larger voltage level for each stitch can differ from the corresponding value of the previous stitch and the threshold value depends on this maximum value, the threshold value must be determined anew for each stitch. Such an evaluation of signals is problematic in particular at high sewing speeds and requires complex evaluation electronics.
  • the invention specified in claim 1 or 2 is based on the object of designing the control device of a stitch-forming machine having a transducer in such a way that the measured values supplied by the transducer are used to detect a plurality of different ones from the first stitch with a proper voltage profile, with little circuitry complexity Skipped stitches and thread disturbances on the monitored thread and on the threads to be linked to it via stitch formation can be evaluated.
  • Monitoring the voltage peaks by the comparison device according to claim 1 or 2 is advantageous if at least one of the saving levels has a plurality of voltage peaks. Since not all of these voltage peaks are usually suitable for the detection of a malfunction, only those are identified by which a malfunction can be identified. As a result, the monitoring time can be reduced to a minimum.
  • the display element which can be switched via the switching device can be designed to be optically or acoustically warning.
  • the voltage peaks can be monitored as soon as the first stitch is carried out with a proper voltage profile, since each voltage peak can immediately be assigned the corresponding limit voltage by the comparison device .
  • the value of the voltage below which a malfunction can be identified can be individually adapted to the maximum of the voltage peak, so that a malfunction can be indicated as quickly as possible after its occurrence, however Variations in the voltage peaks caused by sewing do not cause a switching operation.
  • a common limit voltage is set for all voltage peaks regardless of their magnitude, in order to simplify the circuit design.
  • the second piece of information requires the stitch formation phase of the machine, which is fed to the comparison device as a signal.
  • the drop in a voltage peak below the limit voltage serves to demonstrate a malfunction, while the type of malfunction can be determined by the phase of the stitch formation associated with the voltage peak.
  • Claim 3 specifies a particularly advantageous application of the control device according to the invention, after which different missing stitches as a result of a pick-up or a parting-off error and breakage or end of the needle and the looper thread can be identified by monitoring the tension peaks which indicate the corresponding information.
  • the spring element Due to the measure according to claim 5, the spring element has the lowest possible mass at a predetermined bending strength. As a result, the effect of the natural vibrations of the spring element on the values of the thread tension supplied to the control device is negligible even at high sewing speeds.
  • the measure according to claim 6 reduces the vibrations transmitted from the machine to the transducer to a negligibly small extent, so that the values of the thread tension are not falsified by these vibrations.
  • the measure according to claim 7 causes fluctuations in the voltage generated by the stitch formation distortion of the thread tension transmitted to the control device could be reduced to a minimum.
  • a tensioning device (2) for the needle thread coming from a thread supply (not shown) is arranged on the stand (1) of the two-thread chainstitch sewing machine shown in FIG. 1, a tensioning device (2) for the needle thread coming from a thread supply (not shown) is arranged.
  • a sensor (3) which is attached to the sewing machine via a damping element (4) (Fig. 2), for example made of rubber.
  • the transducer (3) has a bending beam (5), the width of which is reduced from the clamping point to the free end. At its free end, the bending beam (5) is formed on the underside with an eyelet (6) receiving the needle thread.
  • strain gauge elements in the following called strain gauge elements, are provided.
  • a first strain gauge element (7) is fastened on the top side and a second strain gauge element (8) on the bottom side of the bending beam (5) close to its clamping point.
  • the strain gauge elements (7 and 8) are applied to a voltage source (Fig. 3) and connected to a half bridge (9) which is connected to an amplifier (10).
  • the output of the amplifier (10) is at one Tension meter (11) with a display (12) and connected to a comparator (13) with an adjusting device (14) serving to set its switching threshold.
  • the output of the comparator (13) is connected to an input of AND gates (15, 16), the second input of which is connected to a position sensor (18) which determines the revolutions of the main shaft (17).
  • This has a light-emitting diode (19) connected to the positive pole of a regulated voltage source, which is connected to ground via a resistor (20) and a photodetector (21) also connected to the positive pole and designed as a phototransistor, which is connected to ground via a resistor (22) is laid on.
  • the position transmitter (18) has a light-emitting diode (23) connected to the positive pole of the voltage source, which is connected to ground via a resistor (24) and a photodetector (25) also connected to the positive pole and designed as a phototransistor Resistor (26) is connected to ground.
  • the output of the AND gate (15) is connected to the set input (S) of a flip-flop memory (30) and that of the AND gate (16) to the set input (S) of a flip-flop memory (31).
  • the AND gates (15 and 16) together with the memories (30 and 31) form a switching device (32).
  • the output (Q) of the memory (30) is connected to a display element (33) which is connected to ground via a resistor (34), while a display element (35) is connected to the output (Q) of the memory (31) which is connected to ground via a resistor (36).
  • a switch (37) is also connected to the outputs (Q) of the memories (30 and 31) and is connected to a shutdown device (38) of a drive motor (39).
  • the drive motor (39) drives the main shaft (17) via a V-belt.
  • the elements (10 to 37) form a control device (40) which is provided for evaluating the thread tension (U F ) measured by the sensor (3).
  • a first thread guide element (42) is attached to the arm (41) of the sewing machine in the thread take-off direction behind the measured value sensor (3) (FIG. 1) and a second thread guide element (44) is attached to the head (43).
  • the needle thread is fed from the thread guide element (44) to the needle (48) via a thread lever (45) and further thread guide elements (not shown) and an eyelet (47) formed on the needle bar (46).
  • a chain stitch gripper (51) is arranged below the needle plate (50) accommodated in the base plate (49).
  • the hook thread is fed to the hook (51) via a tensioning device (52) attached to the stand (1) and via thread guide elements (not shown).
  • the elements (45, 46, 48 and 51) are referred to below as stitch-forming elements (53).
  • the device works as follows:
  • the needle and looper threads are drawn from the thread supply, the tension of the threads changing depending on the movement of the stitch-forming elements (53). Since the needle and looper threads are to be linked in terms of tension by the stitch formation, a sensor (3) in the path of the needle thread is sufficient to determine the course of the thread tension (U F ) formed from the tensions of all threads.
  • the first voltage level (U P1 ) reaches its voltage peak (U1) at the time (t1).
  • the second voltage level (U p2 ) is formed when the thread lever 45 executes an upward movement to tighten the interlacing formed by the needle thread and the hook thread.
  • the voltage level (U P2 ) has two voltage peaks (U 2.1 and U 2.2 ) at times (t2 and t3), the value of the first voltage peak (U 2.1 ) being that of the second voltage peak (U 2, 2 ) exceeds.
  • the gripper (51) misses the needle thread loop, there is a pick-up error.
  • the course of the thread tension (U F ) changes according to FIG. 4b.
  • the first voltage level (U P1 ) takes on the amount of the normal voltage (U N ) or even drops below it, while the second voltage level (U P2 ) is only designed with a voltage peak (U2).
  • the needle (48) misses the loop formed by the hook thread after penetration of the sewing material, there is a parting error. Like a break of the hook thread in the thread pulling direction behind the tensioning device (52), this is indicated by a change in the course of the thread tension (U F ) according to FIG. 4c.
  • the first voltage level (U P1 ) like the first voltage peak (U 2.1 ) of the second voltage level (U P2 ), remains almost unchanged, while the amount of the second voltage peak (U 2.2 ) is greatly reduced.
  • the transducer (9) (Fig. 1) is arranged between the tensioning device (2) and the thread guide element (42) in such a way that the needle thread passes through the eyelet (6) is deflected. This creates a force perpendicular to the direction of extension of the bending beam (5), by means of which the latter is deflected downward.
  • the strain gauge element (7) on the upper side of the bending beam (5) is subjected to tension and the strain gauge element (8) on the underside thereof is subjected to pressure, so that both strain gauge elements (7, 8) change their electrical resistance.
  • the differential voltage (U D ) is fed to the voltmeter (11) indicating its value and to the comparator (13).
  • the switching threshold of the comparator (13) can be adjusted by the adjusting device (14), so that its sensitivity is adapted to the tension of the needle thread.
  • the switching threshold is selected so that it only drops below one of the voltage peaks (U 1, U 2.2 ) when a malfunction, such as a missing stitch or thread break, has occurred.
  • the voltage corresponding to the switching threshold is referred to below as the limit voltage (U G ), which is shown in FIGS. 4a to 4c.
  • the comparator (13) is switched on as long as the differential voltage (U D ) at its input is less than the limit voltage (U G ) and is switched off as soon as the differential voltage (U D ) assumes or exceeds the value of the limit voltage (U G ) .
  • 4d shows the profile of the output voltage (U K ) of the Comparator (13) as a function of the differential voltage (U D ) according to FIG. 4a, while the course of (U K ) according to FIG. 4e follows that of (U D ) according to FIG. 4b and the course of (U K ) according to Fig. 4f which is assigned by (U D ) according to Fig. 4c.
  • the comparator voltage (U K ) is only present at the input of the AND gates (15 and 16) if none of the pulses (I 1 or I 2) shown in Fig. 4g, delivered by the position transmitter (13) ) arrives. This means that no signal can leave the AND gates (15 and 16).
  • the pulse (I1) of the position transmitter (13) from the photodetector (21) arrives at an input of the AND gate (15) when the comparator voltage (U K ) is present. Then a signal is emitted at the output of the AND gate (15) and fed to the set input (S) of the memory (30).
  • the pulse causes the memory (30) to switch on the display element (33) via its output (Q), which indicates a recording error or the breakage of the needle thread.
  • the switch-off device (38) which, depending on the version, switches off the drive motor (39) immediately or prevents it from restarting after the next stopping process.
  • the photodetector (25) of the position transmitter (18) delivers a pulse (12) to one input of the AND gate (16) at the time (t3), while the comparator voltage (U K ) is present.
  • the AND gate (16) is switched through and emits a signal at its output to the set input (S) of the memory (31), so that this switches on the display element (35) via its output (Q), which indicates a cut-off error or indicates the breakage of the hook thread.
  • the output (Q) of the memory (31) like that of the memory (30), simultaneously controls the switch-off device (38) of the drive motor (39) when the switch (37) is closed.
  • the display element (35) is switched off by an electrical pulse on the reset input (R) of the memory (31) and the drive motor (39) is released.
  • FIG. 5 shows a second embodiment of the measuring sensor (3).
  • a permanent magnet (54) is attached to the top of the free end of the bending beam (5).
  • a Hall sensor (56) is attached to the free end of a support arm (55), facing the permanent magnet (54).
  • the distance between the permanent magnet (54) and the Hall sensor (56) is increased, as a result of which the magnetic flux density and thus the Hall voltage of the Hall sensor (56) corresponding to the deflection of the bending beam ( 5) reduced.
  • the Hall voltage is fed to the control device (40) and evaluated.
  • FIG. 6 shows a second embodiment of the control device (40).
  • the output of the amplifier (10) is connected to the voltmeter (11) and, via an A / D converter (57), to the input (E1) of a microprocessor (58).
  • An input device (59) is connected to a second input (E2) of the microprocessor (58).
  • the microprocessor (58) has outputs (A1 and A2), of which the output (A1) with the set input (S) of a flip-flop memory (60) and the output (A2) with the set input (S) of a flip-flop memory (61) is connected.
  • the memories (60 and 61) form a switching device (62).
  • the output (Q) of the memory (60) is connected to the display element (33), that of the memory (61) to the display element (35). Both outputs (Q) are also connected via the switch (37) to the shutdown device (38) of the drive motor (39).
  • the second embodiment of the control device (40) works as follows:
  • the differential voltage (U D ) (Fig. 7) is fed to the A / D converter (57).
  • a digital voltage is present at the output of the A / D converter (57), which is proportional to the differential voltage (U D ) present at its input.
  • the microprocessor (58) converts the digital voltage recorded at input (E1) only into the Time intervals are evaluated in which the voltage levels (U P1 and U P2 ) are formed.
  • the microprocessor (58) determines the value of all digital voltages assigned to the first voltage level (U p1 ) and forms the maximum value (U M1 ) from these values.
  • the maximum value (U M1 ) is compared with a first threshold value which is assigned to a first limit voltage (U G1 ) (FIG. 7).
  • the limit voltage (U G1 ) is to be preselected as a function of the setting of the tensioning device (2) on the input device (59) and is fed to the microprocessor (58) via its input (E2).
  • the microprocessor (58) outputs a pulse to the memory (60) at the output (A1), as a result of which it is switched over and via its output (Q) controls the display element (33) and, when the switch (37) is closed, the shutdown device (38) of the drive motor (39).
  • the maximum value (U M2 ) is formed from the values of the digital voltages assigned to the second voltage peak (U 2.2 ) of the voltage level (U P2 ) and compared with a second threshold value that corresponds to a second limit voltage (U G2 ) (FIG. 7) assigned. Like the first limit voltage (U G1 ), this is to be preselected as a function of the setting of the tensioning device (2) on the input device (59).
  • the microprocessor (58) If the maximum value (U M2 ) corresponds to or exceeds the second threshold value, there is no signal output by the microprocessor (58). If, on the other hand, the maximum value (U M2 ) falls below the second threshold value as a result of a parting error or a fault on the hook thread, the microprocessor (58) outputs a pulse to the memory (61) at the output (A2). This switches it over and controls the display element (35) and the shutdown device (38) of the drive motor (39) via its output (Q).
  • the memories (60 and 61) can each be switched to their initial position via an electrical signal to the reset input (R).
  • the respective threshold value can be optimally adapted to the corresponding maximum value.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP89912950A 1988-11-24 1989-11-17 Stichbildende maschine mit einem messwertaufnehmer und einer steuervorrichtung Expired - Lifetime EP0445157B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3839733 1988-11-24
DE3839733A DE3839733C2 (de) 1988-11-24 1988-11-24 Stichbildende Maschine mit einem Meßwertaufnehmer

Publications (2)

Publication Number Publication Date
EP0445157A1 EP0445157A1 (de) 1991-09-11
EP0445157B1 true EP0445157B1 (de) 1992-08-05

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ID=6367828

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89912950A Expired - Lifetime EP0445157B1 (de) 1988-11-24 1989-11-17 Stichbildende maschine mit einem messwertaufnehmer und einer steuervorrichtung

Country Status (6)

Country Link
US (1) US5237944A (ja)
EP (1) EP0445157B1 (ja)
JP (1) JP2741952B2 (ja)
KR (1) KR900702114A (ja)
DE (1) DE3839733C2 (ja)
WO (1) WO1990005804A1 (ja)

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IT1229189B (it) * 1988-04-27 1991-07-23 Barudan Co Ltd Apparecchiatura per rilevare il filo in una macchina per cucire
DE4030420A1 (de) * 1990-09-26 1992-04-02 Pfaff Ag G M Verfahren und anordnung zur erkennung von fehlstichen beim betrieb einer naehmaschine
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US5647291A (en) * 1995-03-22 1997-07-15 G.M. Pfaff Aktiengesellschaft Catch thread device for sewing machines
DE19856620A1 (de) * 1998-12-08 2000-06-15 Ksm Kaiserslautern Stickmaschi Stichbildende Maschine und Verfahren zum Erkennen von Fehlfunktionen
US6163733A (en) 1999-04-06 2000-12-19 Rubel; Laurence P. Monitor and malfunction predictor for textile machines
DE19921516C2 (de) * 1999-05-10 2001-12-06 G M Pfaff Ag I I Näh- oder Stickmaschine
EP1284230B1 (en) * 2000-04-27 2006-04-12 Teijin Limited Device and method for fiber processing control
DE10130345A1 (de) * 2001-06-27 2003-01-09 Zsk Stickmasch Gmbh In Abhängigkeit von der Fadenspannung angesteuerter Fadenantriebsmechanismus
US7308333B2 (en) * 2002-01-31 2007-12-11 Melco Industries, Inc. Computerized stitching including embroidering
US6823807B2 (en) * 2002-01-31 2004-11-30 Melco Industries, Inc. Computerized stitching including embroidering
DE10312602A1 (de) * 2003-03-21 2004-09-30 Dürkopp Adler AG Nähmaschine
KR20130071001A (ko) * 2011-12-20 2013-06-28 주식회사 썬스타 실 장력 조절 장치의 기준 작동값 설정 방법 및 재봉기의 실장력 표시 방법
CN103541158B (zh) * 2013-11-06 2015-11-18 绵阳市维博电子有限责任公司 一种圆扣眼锁眼机面线张力检测控制方法及装置
DE102013112623A1 (de) * 2013-11-15 2015-05-21 Jenoptik Optical Systems Gmbh Vorrichtung zum Abblenden eines Strahlenbündels mit kleiner Apertur
JP6286208B2 (ja) * 2014-01-06 2018-02-28 ユニ・チャーム株式会社 タンポンの製造装置、及び、タンポンの製造方法
CN104264382A (zh) * 2014-09-30 2015-01-07 浙江理工大学 一种缝纫机缝线动态张力测试装置及测试方法
CN104630996A (zh) * 2015-01-29 2015-05-20 苏州巨康缝制机器人有限公司 一种防皱缝纫机
DE102015008675A1 (de) * 2015-07-04 2017-01-05 Saurer Ag Schiffchenstickmaschine mit Messvorrichtung zur Überwachung der Fadenspannung des Nadelfadens und Verfahren hierzu
JP7293581B2 (ja) * 2018-02-28 2023-06-20 ブラザー工業株式会社 ミシン
JP7183824B2 (ja) * 2019-01-29 2022-12-06 ブラザー工業株式会社 ミシン

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Also Published As

Publication number Publication date
WO1990005804A1 (de) 1990-05-31
JPH05505113A (ja) 1993-08-05
DE3839733C2 (de) 1993-12-09
EP0445157A1 (de) 1991-09-11
JP2741952B2 (ja) 1998-04-22
KR900702114A (ko) 1990-12-05
US5237944A (en) 1993-08-24
DE3839733A1 (de) 1990-05-31

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