EP1460160B1 - Sewing machine - Google Patents
Sewing machine Download PDFInfo
- Publication number
- EP1460160B1 EP1460160B1 EP04005374A EP04005374A EP1460160B1 EP 1460160 B1 EP1460160 B1 EP 1460160B1 EP 04005374 A EP04005374 A EP 04005374A EP 04005374 A EP04005374 A EP 04005374A EP 1460160 B1 EP1460160 B1 EP 1460160B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- thread
- sewing machine
- sewing
- tightening
- speed
- 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
Links
- 238000009958 sewing Methods 0.000 title claims abstract description 53
- KJLPSBMDOIVXSN-UHFFFAOYSA-N 4-[4-[2-[4-(3,4-dicarboxyphenoxy)phenyl]propan-2-yl]phenoxy]phthalic acid Chemical compound C=1C=C(OC=2C=C(C(C(O)=O)=CC=2)C(O)=O)C=CC=1C(C)(C)C(C=C1)=CC=C1OC1=CC=C(C(O)=O)C(C(O)=O)=C1 KJLPSBMDOIVXSN-UHFFFAOYSA-N 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000005452 bending Methods 0.000 description 6
- 239000004744 fabric Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000005291 magnetic effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000007619 statistical method Methods 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B19/00—Programme-controlled sewing machines
-
- 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
- D05B47/04—Automatically-controlled tensioning devices
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B47/00—Needle-thread tensioning devices; Applications of tensometers
- D05B47/06—Applications of tensometers
Definitions
- the invention relates to a sewing machine for stitching together at least two pieces of fabric by means of an upper thread fed to the workpieces in an upper thread running direction and a lower thread to form a knot of upper thread and lower thread according to the preamble of claim 1.
- a sewing machine is known in which, with regard to a predetermined sewing section, the most accurate tracking of the thread tension is to take place.
- a transducer is designed such that the corresponding thread acts directly on an independent of the thread-tensioning device actuator of the transducer.
- An evaluation and control device is designed such that it is within a predetermined Nähabitess for each of the Sewing machine detected the maximum occurring thread tension and stores these values in a corresponding memory. From these maximum values of the thread tension, a characteristic value is determined with the aid of a statistical analysis method and compared with a predefined setpoint value.
- a manipulated variable for controlling the thread tensioning device is determined and the setting of the thread tensioning device is changed accordingly. It is therefore not from stitch to stitch a target-actual-value comparison between each measured thread tension and the setpoint, but it will first be measured for several stitches the corresponding thread tension values from which then using a statistical analysis method calculates a characteristic value and this characteristic the predetermined setpoint is compared.
- Working with the loop-guided thread tensioning device requires almost constant sewing conditions; During sewing operations with strongly fluctuating sewing conditions, the controller is exposed to too many disturbing variables, so that fluctuations in the sewing quality are to be expected.
- the thread-tensioning device operates at an independent of the speed, ie the operating speed of the sewing machine thread tension, so that changes in the stitch quality can be noticeable at strongly changing speeds.
- the invention is based on the object, a sewing machine of the generic type in such a way that the quality of the producible seams is improved.
- the thread tensioning device can be operated in a control mode or in a control mode.
- a control mode is selected, for example, when the actual sewing conditions are frequent, e.g. B. every two to three stitches, change. Such sewing conditions would expose the controller to a plethora of disturbances, so that favorable guidance of the thread tension force would not be possible.
- the control mode is selected when the actual sewing conditions are almost unchanged over longer seam distances. Due to the curves stored in the microprocessor, it is achieved that the thread tensioning force parameters can each be stored as a program and recalled depending on the sewing operation.
- the embodiment according to claim 2 leads to a user-friendly design, since it allows comfortable working.
- the only one turn-push-button can be rotated without rotation limitation in a clockwise or counterclockwise direction and additionally pressed axially against a spring force. Turning sets values that are saved by pressing the button. For example, this can be set and called up the number of a thread tension program, an operating mode, namely a control mode or a control mode, a thread tensioning force associated with a low speed, the thread tensioning force associated with a higher speed and a thread tension characteristic increasing value.
- the in Fig. 1 shown Näharbeitsplatz has a configured in its basic structure in a conventional manner sewing machine 1, which is arranged on a frame 2 only indicated.
- the sewing machine 1 has in the usual way a lower part 3, a so-called base plate, an upper part 4, a so-called arm, and a lower part 3 and the upper part 4 connecting stand 5, so that it has the overall shape of a C.
- an arm shaft 6 is rotatably mounted, by means of which a needle bar 7 with a needle 8 up and out is driven. Of the arm shaft 6 is mounted in the lower part 3, the needle 8 associated gripper 9 is driven.
- a presser foot 10 is arranged in the upper part 4 .
- the upper side 11 of the lower part 3 is flush with a frame 2 belonging to the support plate 12th
- the arm shaft 6 and thus the entire sewing machine 1 is driven by means of a mounted in the frame 2 drive motor 13 via a belt drive 14.
- a motor control 15 mounted on the drive motor 13 is provided, for the actuation of which an operator-actuatable, only indicated operating switch 16 is provided.
- On the sewing machine 1 is further coupled to the arm shaft 6 position encoder 17 attached, which is connected via a line 18 to a control unit 19, which in turn is connected via a line 20 to the controller 15.
- the operating part 19 and the motor controller 15 together form a sewing machine control device.
- the position encoder 17 are via the line 18 at predetermined angular intervals, the rotational position of the arm shaft 6 representing signals to the controller 15. Usual are 512 signals per revolution of the arm shaft 6. From these signals, inter alia, the speed of the arm shaft 6 and the respective position the needle 8 are derived.
- a first fabric part 24 and a second fabric part 25, sewn together wherein formed in the double-lockstitch sewing machine 1 between the upper thread 23 and a designated in practice as a looper thread lower thread 26 by means of the gripper 9, a node 27 is, if possible, in the joint area 28 of the fabric parts 24, 25, so in the middle of the sewn together sewing material 24, 25, should lie so that it is not visible from any side, as in Fig. 6 is shown.
- the sewing machine 1 described so far is generally known as an industrial sewing machine and millions of times in practice in use.
- the sewing head 21 is an in Fig. 2 and 3 Thread tensioner 29 shown in detail attached.
- This has a means of screws 30 on the sewing head 21 mounted support plate 31.
- a thread-tensioning device 32 is mounted, which has an electric magnet 34 provided with a magnetic coil 33 formed by a wire winding, which is arranged on the rear side of the support plate 31 in a matching recess 35 of the sewing head 21 , Centrally within the coil 33, a bolt 36 is slidably disposed, on which a electro-magnet 34 substantially covering, serving as a magnet armature disc 37 of ferromagnetic material, usually iron, is fixedly arranged, which of the electric magnet 34th is attracted when the coil 33 is traversed by current.
- the force with which the disc 37 is tightened depends on the magnitude of the current flowing through the coil 33.
- the bolt 36 passes through the support plate 31.
- At its front 38 of the support plate 31 facing the end of a clamping plate 39 is fixed by means of a self-locking nut 40.
- the clamping plate 39 can move with the bolt 36 and the disk 37 mounted on it in the longitudinal direction of the bolt 36; but it is secured by means of a pin 41 against rotation.
- the displaceable clamping disk 39 is associated with a fixed on the front side 38 of the support plate 31, stationary clamping disk 42. Between the clamping discs 39, 42, a gap 43 for receiving the upper thread 23 is arranged.
- the clamping discs 39 and 42 thus form two cooperating pressure elements or thread tensioning elements.
- a loop-shaped thread guide 45th and designed as a bolt thread guide 46 is provided on the support plate 31 - based on the upper thread running direction 44 - in front of the thread tensioning device 32.
- a thread guide 45th and designed as a bolt thread guide 46 is provided in the direction 44 behind the device 32 in the direction 44 behind the device 32.
- the thread guide 46 similarly designed thread guide 47 is arranged.
- the upper thread 23 is guided by the thread supply, not shown, through the thread guide 45 and the thread guide 46 to the device 32.
- the upper thread 23 is guided through the gap 43 above the bolt 36 and then to the yarn guide 47. From there, it is guided back to the device 32, specifically below the bolt 36, through the gap 43.
- the displaceable tensioning disk 39 thus presses the upper thread 23 on both sides of the bolt 36 against the stationary tensioning disk 42, so that no tilting of the bolt 36 can occur.
- the upper thread 23 is guided over a conventional compensating spring 48 to the thread lever 22.
- the compensating spring 48 serves to compensate for the small inaccuracies in the guidance of the upper thread 23 via the thread lever 22.
- a control device 49 for the thread tensioning device 32 is further attached.
- This has on the one hand a one-button operating unit 50 and a display unit 51.
- the operating unit 50 has a rotary-pressure knob 52 which is infinitely rotatable in both directions of rotation. It is coupled to a rotary pulse generator 53, which in the usual way has a light barrier 54 with a slot disk 55 arranged inside it.
- the rotation of the knob 52 causes pulses to be output, and in the usual way, each slot of the slot disc 55 will trigger a signal as it passes through the light barrier 54.
- the pulses are forwarded via a line 56 to a microprocessor 57.
- the rotary-pressure button 52 is further connected to a push-button switch 58, which is closed at a depression of the knob 52 in the direction of the support plate 31 and thereby gives a signal via a line 59 to the microprocessor 57.
- the depression of the button 52 takes place against a pressure spring 60.
- the display unit 51 has five display panels 61 to 65.
- the display field 61 marked with # digitally displays a 2-digit, ie from 00 to 99, adjustable sewing program number.
- the display field 62 labeled M indicates the operating mode, ie the control or regulation mode, in 1-digit fashion.
- the designated F1 display panel 63 indicates a n1 associated thread tension force 2-digit.
- the display field 64 denoted by F2 also indicates a two-digit speed associated with a rotational speed n2 yarn tension.
- the display field 65 denoted by F> indicates in 2 digits a characteristic increase value, that is to say a value by which an increase of the F value can be made in case of thickening of the workpiece parts 24, 25.
- the display unit 51 is connected via a line 66 to the microprocessor 57.
- a thread clamping force measuring device 67 is further provided, the structure of the Fig. 2 and 4 evident.
- This measuring device 67 has a fixed to the support plate 31 foot part 68, in which a flexible bending wire 69 on one side, so cantilever-like, is clamped.
- a permanent magnet 70 is mounted, which acts on a Hall sensor 71.
- the upper thread 23 is guided by two thread guides 72, 73, which are the bending wire 69 upstream or downstream.
- the upper thread 23 is guided around the bending wire 69, wherein it is clearly deflected from its straight course between the thread guides 72, 73, such as Fig. 4 is removable.
- the memory 77 having a microprocessor 57 via the line 18 and an input 78, the output at equal angular intervals angular momentum of the position sensor 17 is supplied.
- Via a further input 79 the position or reference signal is supplied.
- Via a further input 80 a switching command is supplied to the microprocessor 57 as soon as the sewing machine 1 is driven by the drive motor 13.
- Via an input 81 the microprocessor 57 is given a switching command, for example via a knee-operated switch 82 actuated by the operator.
- Via further input 83 a signal for a thread trimming process is supplied.
- the microprocessor 57 is followed by a pulse width modulator 84, which in turn is connected via an amplifier 85 to the magnetic coil 33 of the electric magnet 34.
- the magnetic coil 33 is guided via a measuring resistor 86 to ground 87. Furthermore, it is guided to a current regulator 88, which in turn is fed back to the amplifier 85.
- the working method is as follows:
- the digital display fields 61 to 65 light up, with first the first display field 61, ie the 2-digit display of the display of a program number # display panel is displayed with an underscore serving as a cursor 89.
- This cursor 89 indicates which digit can be influenced.
- the desired digit located above the cursor 89 is increased by turning the rotary-push-button 52 clockwise or lowered in the counterclockwise direction.
- the rotary pushbutton 52 is depressed, thereby giving, via the tactile switch 58, a pulse which, on the one hand, defines the mentioned digit stored in the memory 77 and, on the other hand, the cursor 89 among the jumps to the next possible digit.
- the 1-digit number of the program number can now be selected. After appropriate selection of this point by turning the knob 52, this in turn is determined by pressing the button 52. This selects and sets the sewing program; the cursor 89 jumps into the second display field 62. Now the display field 62 is activated for the operating mode M, wherein by turning the knob 52 either by a control mode 1 or by a control mode 2 is selected.
- a Lemvorgang is as follows:
- a Lemvorgang is executed in the control mode.
- several test seams are sewn, each having a sufficient number of stitches, z. B. more than ten stitches, must have.
- the maximum value of the necessary thread tension force which has been measured in a stitch cycle by the thread tension measuring device 67 - as described below - is further utilized .
- the voltage profile output by the thread tension measuring device 67 becomes a desired value for the regulator formed by this measuring device 67, the amplifier 75, the analog-to-digital converter 76, the microprocessor 57 and the thread tensioning device 32 determined.
- a pressure on the button 52 of the last determined such desired value of the voltage curve for the controller and the set current value for the thread tensioning device 32 is stored in the memory 77. This completes the learning phase for the adjustment of a value for the thread tensioning force F1.
- a second learning phase for the thread tension F2 for a speed n ⁇ n2, for example, for a speed n2 2000 min.- 1 , is carried out in the same way, again for this purpose an empirical value for F2 is set and then sewing on numerous test seams with the increased speed F2 is detected for such a speed, in turn, a setpoint for the controller is determined from the voltage curve. With a pressure on the button 52, the last determined setpoint value for the controller and the set current value for the controller are taken over and stored. This also completes the adjustment of the value F2.
- the thread tension force values F are extrapolated linearly. Between n1 and n2, this results in a straight line with increasing speed, which can be sloping, rising or horizontal. Below n1 and above n2, the thread tension force values are kept constant.
- the thread tension force is constantly determined by the thread tension measuring device 67 and reported to the microprocessor 57 and compared there with the stored value, which in turn - if necessary - a readjustment takes place.
- the control mode as the operating mode is caused that the other control variables F1, F2 and F> are placed in a non-variable, ie equally frozen state, so are not changeable.
- thread-tensioning device 32 may also be a thread-tensioning device after the DE 41 41 945 C1 (Corr. U.S. Patent 5,363,786 ) are used, in which the upper thread is guided over a wheel which is braked by means of an electric magnet.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
- Inorganic Insulating Materials (AREA)
- Massaging Devices (AREA)
Abstract
Description
Die Erfindung betrifft eine Nähmaschine zum Zusammennähen von mindestens zwei Nähgutteilen mittels eines den Nähgutteilen in einer Oberfaden-Laufrichtung zugeführten Oberfadens und eines Unterfadens unter Bildung eines Knotens von Oberfaden und Unterfaden nach dem Oberbegriff des Anspruches 1.The invention relates to a sewing machine for stitching together at least two pieces of fabric by means of an upper thread fed to the workpieces in an upper thread running direction and a lower thread to form a knot of upper thread and lower thread according to the preamble of
Aus der
Aus der
Aus der
Der Erfindung liegt die Aufgabe zu Grunde, eine Nähmaschine der gattungsgemäßen Art so auszugestalten, dass die Qualität der erzeugbaren Nähte verbessert wird.The invention is based on the object, a sewing machine of the generic type in such a way that the quality of the producible seams is improved.
Diese Aufgabe wird erfindungsgemäß durch die Merkmale im Kennzeichnungsteil des Anspruches 1 gelöst. Je nach Nähbedingungen kann die Faden-Spann-Vorrichtung in einem Steuerungs-Modus oder in einem Regelungs-Modus betrieben werden. Ein Steuerungs-Modus wird beispielsweise dann gewählt, wenn die tatsächlichen Nähbedingungen sich häufig, z. B. alle zwei bis drei Stiche, ändern. Derartige Nähbedingungen würden den Regler einer Fülle von Störgrößen aussetzen, sodass eine günstige Führung der Fadenspannkraft nicht möglich wäre. Der Regelungs-Modus wird dann gewählt, wenn die tatsächlichen Nähbedingungen über längere Nahtstrecken nahezu unverändert sind. Durch die im Mikroprozessor abgespeicherten Kurven wird erreicht, dass die Fadenspannkraft-Parameter jeweils als Programm abspeicherbar und je nach Nähoperation wieder aufrufbar sind.This object is achieved by the features in the characterizing part of
Die Ausgestaltung nach Anspruch 2 führt zu einer bedienerfreundlichen Ausgestaltung, da sie ein komfortables Arbeiten ermöglicht. Der nur eine Dreh-Druck-Knopf kann ohne Drehbegrenzung im Uhrzeigersinn oder entgegen dem Uhrzeigersinn gedreht werden und zusätzlich gegen eine Federkraft axial gedrückt werden. Durch Drehen werden jeweils Werte vorgegeben, die durch Drücken des Knopfes gespeichert werden. Beispielsweise können hiermit eingestellt und aufgerufen werden die Nummer eines Fadenspannkraft-Programms,
ein Betriebs-Modus, nämlich ein Steuerungs-Modus oder ein Regelungs-Modus,
eine einer niedrigen Drehzahl zugeordnete Fadenspannkraft,
die einer höheren Drehzahl zugeordnete Fadenspannkraft und
ein Fadenspannkraft-Kennlinien-Erhöhungswert.The embodiment according to
an operating mode, namely a control mode or a control mode,
a thread tensioning force associated with a low speed,
the thread tensioning force associated with a higher speed and
a thread tension characteristic increasing value.
Die weiteren Unteransprüche geben weitere vorteilhafte Ausgestaltungen wieder.The further subclaims give further advantageous embodiments again.
Die Erfindung wird nachfolgend an Hand eines Ausführungsbeispieles unter Bezugnahme auf die Zeichnung näher erläutert. Es zeigt
- Fig. 1
- einen Näharbeitsplatz in schematisierter Darstellung,
- Fig. 2
- eine Draufsicht auf eine Faden-Spann-Vorrichtung in gegenüber
Fig. 1 vergrößerter Darstellung, - Fig. 3
- einen Querschnitt durch die Faden-Spann-Vorrichtung entsprechend der Schnittlinie III-III in
Fig. 2 , - Fig. 4
- eine Ansicht einer Faden-Spannkraft-Messeinrichtung entsprechend dem Sichtpfeil IV in
Fig. 2 , - Fig. 5
- ein Block-Schaltbild der Steuerung des Stroms der Faden-Spann-Vorrichtung,
- Fig. 6
- zwei mittels einer Doppel-Steppstich-Naht miteinander vernähte Nähgutteile,
- Fig. 7
- zwei mittels einer Doppel-Steppstich-Naht miteinander vernähte Nähgutteile, in die ein Verstärkungsstreifen eingelegt ist und
- Fig. 8
- ein den Verlauf der Fadenspannkraft über der Drehzahl wiedergebendes Diagramm.
- Fig. 1
- a sewing workplace in a schematic representation,
- Fig. 2
- a plan view of a thread-tensioning device in opposite
Fig. 1 enlarged view, - Fig. 3
- a cross section through the thread-tensioning device according to the section line III-III in
Fig. 2 . - Fig. 4
- a view of a thread clamping force measuring device according to the viewing arrow IV in
Fig. 2 . - Fig. 5
- a block diagram of the control of the current of the thread tensioning device,
- Fig. 6
- two sewing parts sewn together by means of a double lockstitch seam,
- Fig. 7
- two by means of a double-lockstitch seam sewn together sewing material parts, in which a reinforcing strip is inserted and
- Fig. 8
- a diagram showing the course of the thread tension force over the speed.
Der in
Die Armwelle 6 und damit die gesamte Nähmaschine 1 wird mittels eines im Gestell 2 angebrachten Antriebsmotors 13 über einen Riementrieb 14 angetrieben. Zur Steuerung des Antriebsmotors 13 und damit der Nähmaschine 1 ist eine am Antriebsmotor 13 angebrachte Motor-Steuerung 15 vorgesehen, zu deren Betätigung ein von der Bedienungsperson betätigbarer, nur angedeuteter Bedienungs-Schalter 16 vorgesehen ist. An der Nähmaschine 1 ist weiterhin ein mit der Armwelle 6 gekoppelter Positions-Geber 17 angebracht, der über eine Leitung 18 mit einem Bedienteil 19 verbunden ist, welcher wiederum über eine Leitung 20 mit der Steuerung 15 verbunden ist. Der Bedienteil 19 und die Motor-Steuerung 15 bilden gemeinsam eine Nähmaschinen-Steuer-Einrichtung.The
Der Positions-Geber 17 gibt über die Leitung 18 in vorgegebenen Winkelabständen die Drehstellung der Armwelle 6 repräsentierende Signale an die Steuerung 15. Üblich sind 512 Signale pro Umdrehung der Armwelle 6. Aus diesen Signalen kann unter anderem die Drehzahl der Armwelle 6 und die jeweilige Position der Nadel 8 abgeleitet werden. Außerdem gibt der Positions-Geber 17, der auch als Drehimpulsgeber bezeichnet wird, bei jeder Umdrehung ein eine Null-Stellung repräsentierendes Referenz-Signal ab.The position encoder 17 are via the
Am Nähkopf 21 des Oberteils 4 ist - zugeordnet zur Nadelstange 7 - ein ebenfalls von der Armwelle 6 angetriebener Fadenhebel 22 vorgesehen, durch den ein von einem nicht dargestellten Fadenvorrat geführter Oberfaden 23, der in der Praxis auch als Nadelfaden bezeichnet wird, zur Nadel 8 geführt wird. Auf der Nähmaschine 1 werden Nähgutteile, im insbesondere in
Um die vorstehend geschilderte gewünschte Lage des Knotens 27 zu erreichen, ist am Nähkopf 21 eine in
Auf der Tragplatte 31 sind - bezogen auf die Oberfaden-Laufrichtung 44 - vor der Faden-Spann-Vorrichtung 32 eine ösenförmige Fadenführung 45 und eine als Bolzen ausgebildete Fadenführung 46 vorgesehen. In Laufrichtung 44 hinter der Vorrichtung 32 ist eine weitere, mit der Fadenführung 46 gleichartig ausgebildete Fadenführung 47 angeordnet. Wie
An der Tragplatte 31 ist weiterhin eine Bedien-Einrichtung 49 für die Faden-Spann-Vorrichtung 32 angebracht. Diese weist einerseits eine Ein-Knopf-Bedien-Einheit 50 und eine Anzeige-Einheit 51 auf. Die BedienEinheit 50 weist einen Dreh-Druck-Knopf 52 auf, der unbegrenzt in beiden Drehrichtungen verdrehbar ist. Er ist mit einem Dreh-Impuls-Geber 53 gekoppelt, der in üblicher Weise eine Lichtschranke 54 mit einer innerhalb dieser angeordneten Schlitz-Scheibe 55 aufweist. Das Drehen des Knopfes 52 bewirkt eine Ausgabe von Impulsen, wobei in üblicher Weise jeder Schlitz der Schlitz-Scheibe 55 beim Durchlauf durch die Lichtschranke 54 ein Signal auslöst. Die Impulse werden über eine Leitung 56 auf einen Mikroprozessor 57 weitergeleitet. Das Drehen des Knopfes 52 in einer Drehrichtung bewirkt ein Aufwärtszählen der Impulse im Mikroprozessor, während ein Drehen in der entgegengesetzten Richtung ein Abwärtszählen bewirkt. Der Dreh-Druck-Knopf 52 ist weiterhin mit einem Tast-Schalter 58 verbunden, der bei einem Eindrücken des Knopfes 52 in Richtung der Tragplatte 31 geschlossen wird und hierbei ein Signal über eine Leitung 59 auf den Mikroprozessor 57 gibt. Das Eindrücken des Knopfes 52 erfolgt gegen eine Druck-Feder 60.On the
Die Anzeige-Einheit 51 weist fünf Anzeigefelder 61 bis 65 auf. Das mit # gekennzeichnete Anzeigefeld 61 zeigt digital eine 2-stellig, also von 00 bis 99, einstellbare Näh-Programm-Nummer an. Das mit M bezeichnete Anzeigefeld 62 zeigt 1-stellig den Betriebsmodus, also den Steuerungs- oder Regelungs-Modus, an. Das mit F1 bezeichnete Anzeigefeld 63 zeigt eine einer Drehzahl n1 zugeordnete Fadenspannkraft 2-stellig an. Das mit F2 bezeichnete Anzeigefeld 64 zeigt ebenfalls 2-stellig eine einer Drehzahl n2 zugeordnete Fadenspannkraft an. Das mit F> bezeichnete Anzeigefeld 65 zeigt 2-stellig einen Kennlinien-Erhöhungswert an, also einen Wert, um den bei Verdickungen der Nähgutteile 24, 25 ein F-Wert erhöht werden kann. Auch die Anzeige-Einheit 51 ist über eine Leitung 66 mit dem Mikroprozessor 57 verbunden.The
Auf der Tragplatte 31 ist weiterhin eine Faden-Spannkraft-Messeinrichtung 67 vorgesehen, deren Aufbau aus den
Wie
Dem Mikroprozessor 57 ist ein Pulsweiten-Modulator 84 nachgeordnet, der wiederum über einen Verstärker 85 auf die Magnet-Spule 33 des Elektro-Magneten 34 geschaltet ist. Die Magnet-Spule 33 ist über einen Messwiderstand 86 gegen Masse 87 geführt. Weiterhin ist sie auf einen Stromregler 88 geführt, der wiederum auf den Verstärker 85 zurückgeführt ist.The
Mit dem Einschalten der Maschine 1 leuchten die Digital-Anzeigefelder 61 bis 65 auf, wobei zuerst das erste Anzeigefeld 61, also die 2-stellige Anzeige des eine Programm-Nummer # anzeigenden Anzeigefeldes, mit einem als Cursor 89 dienenden Unterstrich angezeigt wird. Dieser Cursor 89 zeigt an, welche Ziffer beeinflussbar ist. Die über dem Cursor 89 befindliche, gewünschte Ziffer wird durch Drehen des Dreh-Druck-Knopfes 52 im Uhrzeigersinn erhöht bzw. im Gegenuhrzeigersinn erniedrigt. Wenn die gewünschte Ziffer angezeigt wird, wird der Dreh-Druck-Knopf 52 gedrückt, wodurch über den Tast-Schalter 58 ein Impuls gegeben wird, der einerseits die erwähnte Ziffer festlegt, die im Speicher 77 gespeichert wird, und andererseits den Cursor 89 unter die nächstmögliche Ziffer springen lässt. Im erwähnten Beispiel kann nunmehr die 1er-Stelle der Programm-Nummer gewählt werden. Nach entsprechender Wahl dieser Stelle durch Drehen des Knopfes 52 wird diese wiederum durch Drücken des Knopfes 52 festgelegt. Damit ist das Näh-Programm gewählt und festgelegt; der Cursor 89 springt in das zweite Anzeigefeld 62. Nunmehr ist das Anzeigefeld 62 für den Betriebs-Modus M aktiviert, wobei durch entsprechendes Drehen des Knopfes 52 entweder über eine 1 der Regelungs-Modus oder über eine 2 der Steuerungs-Modus ausgewählt wird.When the
Ein Lemvorgang wird im Steuerungs-Modus ausgeführt. Hierbei werden mehrere Testnähte genäht, die jeweils eine ausreichende Anzahl von Stichen, z. B. mehr als zehn Stiche, aufweisen müssen. Nach der empirischen Ermittlung einer qualitativ akzeptablen Naht, wie sie oben bereits beschrieben wurde, wird der maximale Wert der notwendigen Fadenspannkraft, der in einem Stichbilde-Zyklus von der Faden-Spannkraft-Messeinrichtung 67 gemessen worden ist - wie nachfolgend beschrieben wird -, weiter verwertet.A Lemvorgang is executed in the control mode. In this case, several test seams are sewn, each having a sufficient number of stitches, z. B. more than ten stitches, must have. After the empirical determination of a qualitatively acceptable seam as already described above, the maximum value of the necessary thread tension force which has been measured in a stitch cycle by the thread tension measuring device 67 - as described below - is further utilized ,
Zur Einjustierung der Faden-Spann-Vorrichtung 32 stellt die Bedienungsperson zunächst Erfahrungsgrößen für die Stellgrößen F1, F2 und F> ein. Jedem F-Wert entspricht ein bestimmter Wert für einen Strom, mit dem die Spule 33 beaufschlagt wird. Anschließend wird für eine erste Lemphase für die Armwellendrehzahl n ≤ n1, beispielsweise für n1 = 1000 min.-1, eine erste Testnaht genäht. Soweit das Nähergebnis noch nicht zufriedenstellend ist, verändert die Bedienungsperson den Wert für F1 in der geschilderten Weise und näht eine weitere Testnaht. Dies wird so oft wiederholt, bis das Nähergebnis den Qualitätsanforderungen genügt. Während des Nähens der Testnaht wird aus dem von der Faden-Spannkraft-Messeinrichtung 67 abgegebenen Spannungsverlauf ein Sollwert für den durch diese Messeinrichtung 67, den Verstärker 75, den Analog-Digital-Wandler 76, den Mikroprozessor 57 und die Fadenspann-Vorrichtung 32 gebildeten Regler ermittelt. Mit einem Druck auf den Knopf 52 wird der zuletzt ermittelte derartige Sollwert des Spannungsverlaufs für den Regler und der eingestellte Stromwert für die Faden-Spann-Vorrichtung 32 im Speicher 77 gespeichert. Damit ist die Lernphase für die Einjustierung eines Wertes für die Fadenspannkraft F1 beendet.To adjust the
Eine zweite Lernphase für die Fadenspannkraft F2 für eine Drehzahl n ≥ n2, beispielsweise für eine Drehzahl n2 = 2000 min.-1, erfolgt in gleicher Weise, wobei wiederum hierfür zuerst ein Erfahrungswert für F2 eingestellt wird und dann über das Nähen zahlreicher Testnähte mit der erhöhten Drehzahl F2 für eine solche Drehzahl erfasst wird, wobei wiederum aus dem Spannungsverlauf ein Sollwert für den Regler ermittelt wird. Mit einem Druck auf den Knopf 52 wird der zuletzt ermittelte Sollwert für den Regler und der eingestellte Stromwert für die Steuerung übernommen und gespeichert. Damit ist auch die Einjustierung des Wertes F2 beendet.A second learning phase for the thread tension F2 for a speed n ≥ n2, for example, for a speed n2 = 2000 min.- 1 , is carried out in the same way, again for this purpose an empirical value for F2 is set and then sewing on numerous test seams with the increased speed F2 is detected for such a speed, in turn, a setpoint for the controller is determined from the voltage curve. With a pressure on the
In einer Lemphase für F> wird in gleicher Weise vorgegangen. Ein solcher Kennlinien-Erhöhungswert F>, der bei Verdickung des Nähgutes benötigt wird, ist z. B. dann erforderlich, wenn entsprechend
Wie sich aus dem Diagramm in
Die Errechnung dieser Werte erfolgt im Mikroprozessor 57.The calculation of these values takes place in the
Wenn im anschließenden Nähvorgang im Steuerungs-Modus gefahren wird, dann wird nur die Drehzahl der Nähmaschine 1 erfasst und die Magnet-Spule 33 der Faden-Spann-Vorrichtung 32 mit dem für die Drehzahl ermittelten und gespeicherten Strom beaufschlagt. Es erfolgt keine Rückmeldung und Nachregelung.When driving in the subsequent sewing in the control mode, then only the speed of the
Wenn dagegen im Regelungs-Modus gefahren wird, dann wird ständig die Fadenspannkraft von der Faden-Spannkraft-Messeinrichtung 67 ermittelt und an den Mikroprozessor 57 gemeldet und dort mit dem gespeicherten Wert verglichen, wodurch wiederum - soweit notwendig - eine Nachregelung erfolgt. Mit der Auswahl des Regelungs-Modus als Betriebs-Modus wird veranlasst, dass die weiteren Stellgrößen F1, F2 und F> in einen nichtveränderbaren, also gleichermaßen eingefrorenen, Zustand versetzt werden, also nichtveränderbar sind.If, on the other hand, driving in the control mode, then the thread tension force is constantly determined by the thread
Anstelle der Ausgestaltung der Faden-Spann-Vorrichtung 32 mit den beiden Spannscheiben 39, 42 kann auch eine Faden-Spann-Vorrichtung nach der
Claims (5)
- A sewing machine (1) for sewing together at least two work pieces (24, 25) by means of an upper thread (23) that is fed to the work pieces (24, 25) in an upper-thread feed direction (44) and an under thread (26), with a knot (27) being formed by the upper thread (23) and under thread (26), comprising- an arm shaft (6);- a driving motor (13) which drives the arm shaft (6) at a variable speed (n);- a sewing-machine control (15);- a needle bar (7) with a needle (8), the needle bar (7) being drivable by the arm shaft (6);- a thread-tightening arrangement (29),-- which comprises a thread tightener (32) that is in contact with the upper thread (23), and-- which produces a thread-tightening power (F) in the upper thread (23) by means of a solenoid (34) through which current flows,--- the current being modified in dependence on the speed (n) of the arm shaft (6) according to a determined curve of the thread-tightening power (F) over the speed (n) such that the knot (27) of the upper thread (23) and under thread (26) lies substantially between the work pieces (24, 25); and- an operating device (49) for the thread tightener (32);characterized in that
the thread-tightener (32) is operated optionally in an open-loop control mode or in a closed-loop control mode, wherein- a microprocessor (57) is provided, having a memory (77) where curves of the thread-tightening power (F) over the speed (n) are storable and recallable depending on the sewing operation,- the thread tightener (32) comprises a thread-tightening-power measuring device (67) which is connected to the microprocessor (57) for transmission of a determined thread-tightening power (F). - A sewing machine (1) according to claim 1, characterized in that a single-knob control (50) is provided for the closed-loop control mode and the open-loop control mode.
- A sewing machine (1) according to claim 2, characterized in that the single-knob control (50) comprises a lock-down button (52) for manual rotary operation of a moment of momentum transmitter and for pressure operation of a push button (58).
- A sewing machine (1) according to one of claims 1 to 3, characterized in that the operating device (49) comprises a display (51) with several display areas (61 to 65) for display of a program identification (#), an operating mode (M) and at least two thread-tightening-power values (F1, F2) that are allocated to a respective speed (n1, n2).
- A sewing machine (1) according to claim 4, characterized in that the display (51) comprises another display area (65) for a thread-tightening-power increase value (F>).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10312602A DE10312602A1 (en) | 2003-03-21 | 2003-03-21 | sewing machine |
DE10312602 | 2003-03-21 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1460160A1 EP1460160A1 (en) | 2004-09-22 |
EP1460160B1 true EP1460160B1 (en) | 2010-10-06 |
Family
ID=32798015
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP04005374A Expired - Lifetime EP1460160B1 (en) | 2003-03-21 | 2004-03-06 | Sewing machine |
Country Status (7)
Country | Link |
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EP (1) | EP1460160B1 (en) |
JP (1) | JP2004283582A (en) |
KR (1) | KR20040083367A (en) |
CN (1) | CN1532322A (en) |
AT (1) | ATE483840T1 (en) |
DE (2) | DE10312602A1 (en) |
TW (1) | TW200422464A (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5408949B2 (en) * | 2008-10-03 | 2014-02-05 | Juki株式会社 | sewing machine |
WO2012014610A1 (en) * | 2010-07-28 | 2012-02-02 | エヌエスディ株式会社 | Sewing machine |
DE202012011059U1 (en) * | 2012-11-19 | 2014-02-20 | Dürkopp Adler AG | sewing machine |
CH709666A1 (en) * | 2014-05-16 | 2015-11-30 | Bernina Int Ag | Apparatus and method for influencing a position of nodes between the upper and lower threads for sewing with a sewing machine. |
TWI625440B (en) * | 2017-01-26 | 2018-06-01 | Zeng Hsing Industrial Co Ltd | Sewing machine with free seam function |
CN107354610B (en) * | 2017-09-11 | 2023-07-25 | 广东溢达纺织有限公司 | Electronic wire clamp device and sewing mechanism |
CN110205753B (en) * | 2018-02-28 | 2022-02-08 | 兄弟工业株式会社 | Sewing machine and thread tension detection device |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6185985A (en) * | 1984-10-03 | 1986-05-01 | 蛇の目ミシン工業株式会社 | Automatic tension sewing machine |
DE3839733C2 (en) * | 1988-11-24 | 1993-12-09 | Pfaff Ag G M | Stitch-forming machine with a sensor |
DE3843373A1 (en) * | 1988-12-23 | 1990-06-28 | Kochs Adler Ag | Sewing machine thread tensioner |
DE19921516C2 (en) * | 1999-05-10 | 2001-12-06 | G M Pfaff Ag I I | Sewing or embroidery machine |
DE10113945C1 (en) * | 2001-03-22 | 2002-06-13 | Duerkopp Adler Ag | Sewing machine has electro-magnetically controlled thread tensioning unit, operated on the basis of empirical experience |
-
2003
- 2003-03-21 DE DE10312602A patent/DE10312602A1/en not_active Withdrawn
-
2004
- 2004-03-06 DE DE502004011715T patent/DE502004011715D1/en not_active Expired - Lifetime
- 2004-03-06 AT AT04005374T patent/ATE483840T1/en active
- 2004-03-06 EP EP04005374A patent/EP1460160B1/en not_active Expired - Lifetime
- 2004-03-09 TW TW093106179A patent/TW200422464A/en unknown
- 2004-03-17 KR KR1020040017939A patent/KR20040083367A/en not_active Application Discontinuation
- 2004-03-18 JP JP2004077912A patent/JP2004283582A/en active Pending
- 2004-03-19 CN CNA2004100294976A patent/CN1532322A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
KR20040083367A (en) | 2004-10-01 |
EP1460160A1 (en) | 2004-09-22 |
CN1532322A (en) | 2004-09-29 |
JP2004283582A (en) | 2004-10-14 |
DE10312602A1 (en) | 2004-09-30 |
DE502004011715D1 (en) | 2010-11-18 |
ATE483840T1 (en) | 2010-10-15 |
TW200422464A (en) | 2004-11-01 |
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