EP2497852A1 - Sewing machine and method for sewing a beginning of a seam with a sewing machine of this type - Google Patents
Sewing machine and method for sewing a beginning of a seam with a sewing machine of this type Download PDFInfo
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- EP2497852A1 EP2497852A1 EP12156449A EP12156449A EP2497852A1 EP 2497852 A1 EP2497852 A1 EP 2497852A1 EP 12156449 A EP12156449 A EP 12156449A EP 12156449 A EP12156449 A EP 12156449A EP 2497852 A1 EP2497852 A1 EP 2497852A1
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- EP
- European Patent Office
- Prior art keywords
- thread
- upper thread
- lever
- gripper
- pulling device
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- 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.)
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- 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
Definitions
- the invention relates to a sewing machine according to the preamble of claim 1. Furthermore, the invention relates to a method for sewing a seam beginning with such a sewing machine.
- a generic sewing machine is known from the EP 2 028 311 A2 and from the DE 102 34 251 A ,
- a thread pulling device between the thread lever and the upper thread tensioning device leads to the possibility of withdrawing a thread excess resulting from a downward movement of the thread lever and then withdrawing the upper thread during sewing of the seam beginning so far in the sewing material by means of the thread lever that the free end of the Upper thread at the seam beginning only slightly protrudes from the fabric.
- the upper thread is thereby withdrawn by a length corresponding to the thread path difference, which is brought about by the thread pulling device.
- the free end of the upper thread representing the beginning of the upper thread can be pulled under the sewing material, so that it does not affect the appearance of the sewn sewing material.
- the upper thread tensioning means may be divided into one upper thread main tensioning device and upper thread biasing or auxiliary tensioning device.
- the upper thread main tension unit which together with the thread lever predefines an area of the upper thread course in which the thread pulling device is arranged, forms part of the upper thread main tensioning device, ie not part of the upper thread tensioning or additional tensioning device.
- a thread pulling device can be integrated with little structural effort in an upper thread guide.
- a drive for displacing the thread eyelet can be effected by means of a lifting cylinder or a lifting magnet.
- a positioning drive for the boom of the thread pulling device may comprise a stepper motor.
- An eyelet arrangement according to claim 3 optimizes the thread-pulling effect of the thread pulling device.
- the two fixed thread guide eyelets are arranged in the thread path near the pivotable thread eyelet.
- a distance between the pivotable thread eyelet in the neutral position and the two fixed thread guide eyelets fixed to the housing can be less than 2 cm and can also be less than 1 cm.
- An arrangement of the upper thread tensioning device according to claim 5 facilitates a driving sequence in operating the thread pulling device, because synchronization of an operation of the upper thread tensioning device with the operation of the thread pulling device is not required.
- a configuration with a plurality of upper thread main tension units according to claim 6 is possible.
- Such a configuration of the upper thread tensioning device leads to a secure and defined thread tension in the sewing operation.
- the thread pulling device can then be arranged between the upper thread main tension units. There is usually sufficient space to accommodate the Fadenzieh worn given.
- the advantages of a method according to claim 7 and 8 correspond to those which have already been explained above in connection with the device.
- the counter-rotation position can be reached after a rotation of the hook tip by at least 180 ° after the detection rotational position, for example after a rotation of the hook tip by 240 ° or 245 °. Due to the maintenance of the thread clamping position during at least a part of the gripper rotation after the detection of the upper thread by the gripper is achieved that the upper thread end is pulled at the beginning of the seam with the gripper through the fabric down.
- the tightening of the upper thread when changing the thread pulling device from the neutral position to the thread pulling position causes the thread lever when he raises again, with the upper thread clamp released, the upper thread at the beginning of the seam by the path difference of the upper thread, by the conversion of the thread pulling device is brought about, withdrawn predetermined length amount.
- the changeover of the thread pulling device from the neutral position to the thread pulling position can take place during the first stitch of the beginning of the seam.
- the changeover can alternatively take place during the second stitch, during the third stitch or during an even later stitch when sewing the beginning of the seam.
- the return of the thread pulling device from the thread pulling position to the neutral position can be incremental during further sewing in small steps.
- the reset can also be done at the end of the sewing process.
- the switching to the neutral position can be done for example in a final thread cutting process of the sewing machine.
- the thread pulling device pulls the upper thread from the thread lever ago and thus desirably retracts the upper thread from the fabric.
- the upper thread main tension units between the thread lever and the thread pulling device can set the upper thread under a reduced residual thread tension in comparison to the normal tension.
- the upper thread main tension units between the thread lever and the thread pulling device can be completely deactivated.
- Relieving a fabric presser according to claim 10 prevents that when pulling the upper thread through the fabric down through the gripper of the upper thread is undesirable clamped by the fabric presser.
- a sewing machine 1 has an upper arm 2 and a lower case-like base plate 3, which are interconnected by a stand 4 to a C-shaped housing.
- the arm 2 is an arm shaft 5 (see. Fig.2 ), which is driven by a motor accommodated by means of a belt drive accommodated in the stand 4.
- a central control device 6 is connected, which in the Fig. 1 is shown schematically in the upper arm 2, but also at a different location and also relative to the sewing machine 1 can be arranged externally and connected thereto, for example via a cable harness.
- a needle bar 7 is driven up and down, at the lower end of a needle 8 is mounted. Through an eye of the needle 8, an upper thread 9 (see. Fig. 2 ).
- a gripper 10 is arranged, which in a conventional manner derived from the arm shaft 5 about a vertical axis of rotation 11 (see. Fig. 2 ) is rotary drivable.
- a bobbin or thread winding housing 12 of the gripper 10 is a supply of a lower thread 13 (see. Fig. 4 ).
- Fig. 2 shows the leadership of the upper thread 9 of the sewing machine 1 in detail.
- a first upper thread clamp 14 is arranged, which has a clamping plate 15 which is displaceable relative to a base 16 of the first needle thread clamp 14.
- the first needle thread clamp 14 is in signal communication with the control device 6 and is displaceable between a thread clamping position, in which the upper thread 9 is clamped at the location of the first upper thread clamp 14, and a thread release position, in which the first upper thread clamp 14, the upper thread 9 releases.
- the upper thread 9 runs substantially vertically.
- a passage location of the upper thread 9 through the first upper thread clamp 14 can be predetermined by means of a plurality of thread passage openings 17 in the base body 16.
- the upper thread 9 extends in the second yarn passage opening 17 from the right of a total of five arranged transversely to the yarn transport direction yarn passage openings.
- a thread lever 18 is arranged, whose up and down movement is also derived from the arm shaft 5 in a conventional manner. Between a arranged at the free end of the thread lever 18 thread lever eye 19 and the first upper thread clamp 14 of the upper thread 9 still passes through a guide eye 20, the on in the Fig. 2 upper end of the base 16 is attached.
- a needle thread main tensioning device 21 Upstream of the thread lever 18, the upper thread 9 passes through a needle thread main tensioning device 21.
- the latter has in the execution of the Fig. 1 to 7 a working in a conventional manner upper thread main tension unit in the form of a main voltage generator 22.
- the upper thread main tensioning device 21 is in signal communication with the central control device 6.
- the main voltage generator 22 sets the upper thread 9 when activated, ie when a thread tension fan cylinder drops, by the control device 6 below a predetermined thread tension.
- the yarn tension fan cylinder is not shown in the drawing.
- the main voltage generator 22 can also be used to clamp the upper thread 9 at the location of the main voltage generator 22.
- the upper thread 9 passes through another guide eye 23 which can be displaced transversely to the upper thread transport direction. Between the guide eye 23 and the upper thread main tensioning device 21, the upper thread 9 passes through a thread tension spring unit 23a.
- a thread pulling device 24 is arranged in the course of the upper thread 9.
- the thread pulling device 24 has a pivotable arm 25, which is articulated via a pivot joint 26 on a mounting plate 26 a, which in turn is attached to the arm 2.
- the thread pulling device 24 is thus mounted on the mounting plate 26a.
- the boom 25 of the thread pulling device 24 has a thread eye 27 which is deflectable transversely to the yarn path of the upper thread 9 between two attached to the mounting plate 26 a fixed to the housing guide eyelets 28.
- the boom 25 is changeable between a in the Fig. 2 shown neutral position and one in the Fig.
- the two housing-fixed guide eyelets 28 cause regardless of whether the boom 25 is in the thread-pulling position or in the neutral position, the upper thread 9 outside the course between the two housing-fixed guide eyelets 28 each takes the same course.
- the boom 25 is convertible between the neutral position and the thread pulling position by an electromagnetic drive, which in turn is in signal communication with the control device 6.
- an electromagnetic drive the boom 25 can also be driven pneumatically or by a stepping motor.
- an upper thread biasing device 29 is arranged, which also operates in a manner known per se and can be in signal communication with the control device 6.
- the upper thread main tensioning device 21 with the main tension transmitter 22 and the upper thread biasing device 29 are attached to the mounting plate 26a, which in turn is mounted on the arm 2 (see FIG. Fig. 1 ).
- the upper thread 9 passes through a thread passage opening 31, which in the mounting plate 26 a in the in Fig. 2 upper and forward by about 90 ° bent edge region is executed.
- a bobbin Upstream of the thread passage opening 31, a bobbin, not shown, is arranged as an upper thread supply.
- Fig. 2 to 7 show at a moment with the arm shaft 5 rotatably connected handwheel 32 a rotational angle scale 33 is arranged, which is a full revolution of the arm shaft 5 subdivided into 360 angular degrees increments.
- This degree of rotation angle scale 33 will be referred to in the following.
- a sewing material plane is defined by a support position of sewing material 34 (cf. Fig. 4 ) is set on a needle plate 35 of the sewing machine 1.
- Fig. 2 shows the Armwellengnagnagnagna himself 0 °.
- the needle bar 7 is at top dead center. This position is selected at the beginning of the sewing, ie at the beginning of the seam, because there is the largest passage under the needle 8 for inserting the material 34.
- the upper thread clamp 14 In position 0 °, the upper thread clamp 14 is in the thread release position.
- the upper thread main tensioning device 21 is activated.
- the thread pulling device 24 is in the neutral position.
- the upper thread biasing device 29 is activated.
- the thread lever 18 is on the way from bottom dead center to the top.
- the Fig. 3 shows the arm shaft 5 in the position 205 °.
- the needle bar 7 is a little way from its bottom dead center, which was reached at 180 °, returned again, so that in addition to the eye of the needle 8 in the Fig. 3 invisible upper thread loop has formed.
- a in the Fig. 3 also not visible gripper tip of the gripper 10 engage in the upper thread loop and then take the upper thread 9.
- the upper thread clamp 14 is activated in the thread clamping position.
- the upper thread main tensioning device 21 is activated.
- the thread pulling device 24 is in the neutral position.
- the upper thread biasing device 29 is activated.
- the thread lever 18 is located on his way to bottom dead center. The thread lever 18 is already removed from its top dead center, so that between the upper thread clamp 14 and the upper thread main tensioning device 21 results in a yarn excess, the thread there is therefore not tense, as in the Fig. 2 shown.
- This excess thread is approximately twice the distance of the thread lever eye 19 from top dead center of the thread lever 18 to in the Fig. 2 illustrated position 205 °. From position 205 ° begins the gripper 10 with his engaging in the upper thread loop hook tip to take off the upper thread.
- Fig. 5 shows the Armwellengnagnagna 1000 °.
- the thread lever eye 19 is in the area of bottom dead center.
- Oberfadenzug continued by the gripper 10.
- the upper thread 9 is pulled by the gripper 10 through the fabric down.
- the discharge of the presser foot 37 which was active between the Armwellengnadianen 205 ° and 300 °, is now so disabled again.
- the upper thread clamp 14 is now transferred to the thread release position.
- the upper thread main tensioning device 21 is activated and keeps the upper thread 9 under tension.
- the boom 25 of the thread pulling device 24 is in the neutral position.
- the upper thread biasing device 29 is activated. In the position 300 °, the free end 36 of the upper thread 9 has been pulled by the gripper 10 further down.
- the gripper 10 pulls a free end 36 of the upper thread 9 through the fabric 34 down.
- the thread lever 18 pulls the upper thread 9 in the fabric 34, as will become apparent from the following description.
- the free end 36 is then out of the sewing material 34 by a correspondingly smaller amount of the thread length.
- Fig. 6 shows at the next stitch the Armwellen ein 325 °. Opposite the position Fig. 3 has the arm shaft 5 in Näh Anlagenscardi thus rotated by 120 ° (actually 480 °) on.
- the thread lever eye 19 is in the position 325 ° in an incipient upward movement to the bottom dead center.
- the gripper 10 has also compared to the position Fig. 3 rotated by 240 ° (actually 960 °) about the axis of rotation 11.
- the thread lever 18 is retracted in the course of Armwellenfitung the upper thread 9 in the area of the formed stitch and that by the amount that the Upper thread 9 now takes an extended thread path course in the area of the thread pulling device 24.
- Fig. 7 shows the Armwellengnagnagnagna needle 8 °.
- the needle 8 is on the way down.
- the upper thread clamp 14 is in the release position.
- the upper thread main tensioning device 21 is activated.
- the upper thread biasing device 29 is activated.
- the thread pulling device 24 is in the thread pulling position. In the thread-pulling position, the thread pulling device 24 remains during the entire course of the seam formation.
- This increment per stitch is so small that a yarn path smaller than the stitch length is returned to the thread pulling device 24 per increment changeover operation.
- the additional thread path which was created over the detour of the upper thread 9 via the retracted into the thread pulling thread pulling device 24, returned to the movement of the thread lever 18 again, without affecting the further seam formation.
- the activation of the thread pulling device 24 in the thread pulling position at the Armwellen ein 325 ° causes the free end 36 of the upper thread 9 with the thread lever 18 by the fabric 34, in the course, retracted and thus shortened.
- the conversion of the thread pulling device 24 from the neutral position to the thread pulling position can also be done at the first stitch, at the third stitch, or at an even later stitch.
- the status information "seam beginning” in the control device 6 is converted into "running seam".
- a renewed change to "seam beginning” takes place after a thread trimming operation via the control device 6.
- This status information is queried during the further sewing process.
- the thread pulling device 24 is only actuated if the status information "seam beginning" is present.
- the thread pulling device 24 is returned to the neutral position. This can, as already mentioned above, also occur incrementally during seam formation.
- the length of the over the fabric 34 protruding free end 36 can be specified by the angular position of the boom 25 in the thread pulling position.
- a plurality of initial thread lengths can be preselected.
- the angular position of the arm 25 triggered by the control device 6 results in the thread pulling position.
- a thread-pulling length which leads to a corresponding initial thread length, can alternatively also be set via a mechanical stop for the boom 25.
- the method for sewing the seam beginning can be described as follows. First, the upper thread loop is formed. Subsequently, the upper thread loop is grasped with the looper tip of the looper 10 in a detection rotation position of the looper tip. Subsequently, the upper thread 9 with the gripper tip of the gripper 10 during one revolution of the gripper tip of the gripper 10 to the gripper housing of the gripper 10 by about 240 ° to 250 °, in particular by 245 °, until reaching the detection rotational position opposite counter-rotation position moved out. From the detection rotational position, the gripper tip of the gripper 10 rotates to the counter-rotational position so by at least half a revolution about the gripper housing of the gripper 10. After reaching the counter-rotational position of the hook tip of the gripper 10, the thread pulling device 24 is changed over from the neutral position to the thread pulling position.
- the Fadenwegdifferenz which is brought about by the conversion of the boom 25 between the neutral position and the thread pulling position, 34 can be specified depending on a thickness of the fabric.
- the thickness of the fabric 34 may be adjusted by the user or may be measured by a thickness sensor, not shown in the drawing.
- the control device 6 may also be in signal communication with the Ndozensgut-thickness sensor.
- the main voltage generator 22 can be released for a thread trimming operation at the end of the sewing process, so that there is no thread tension at the location of the main voltage generator 22. During the sewing operation, the main voltage generator 22 generates the thread tension required for sewing. In conjunction with the switching of the thread pulling device 24 from the neutral position to the thread pulling position of the main voltage generator 22 can be converted into a thread clamping position, so as to ensure that the upper thread 9 is withdrawn from the free end 36 ago. This thread clamping function of the main voltage generator 22 can be used in sewing tasks in which the upper thread 9 is exposed to high friction in the fabric.
- An upper thread main tensioning device 38 of the embodiment according to 8 to 12 has two upper thread main tension units 39, 40, which are jointly designed as a main tension generator.
- One of the two upper thread main tension units, the upper thread main tension unit 40 is arranged in the upper thread path between the thread lever 18 and the thread pulling device 24.
- This upper thread main tension unit 40 is compared with the main tension device 21 of the embodiment of FIGS Fig. 1 to 7 additionally provided.
- the other of the two upper-thread main tension units, the upper-thread main tension unit 39 is disposed where the upper-thread main tension unit 22 after the Fig. 1 to 7 is arranged.
- the residual thread tension prevents the upper thread 9 from being accelerated when the upper thread 9 is pulled with the thread pulling device 24 so that more upper thread 9 is withdrawn than results from the thread path difference of the upper thread 9 between the neutral position and the thread pulling position of the thread pulling device 24.
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Abstract
Description
Die Erfindung betrifft eine Nähmaschine nach dem Oberbegriff des Anspruchs 1. Ferner betrifft die Erfindung ein Verfahren zum Nähen eines Nahtanfangs mit einer derartigen Nähmaschine.The invention relates to a sewing machine according to the preamble of claim 1. Furthermore, the invention relates to a method for sewing a seam beginning with such a sewing machine.
Eine gattungsgemäße Nähmaschine ist bekannt aus der
Es ist daher eine Aufgabe der vorliegenden Erfindung, auf betriebssichere Weise ein kurzes am Nahtanfang aus dem Nähgut herausstehendes Oberfadenstück zu gewährleisten, wobei dies mit geringem baulichen Aufwand geschehen soll.It is therefore an object of the present invention to ensure in a reliable manner a short at the beginning of the seam protruding from the fabric upper thread piece, this being done with little structural effort.
Diese Aufgabe ist erfindungsgemäß gelöst durch eine Nähmaschine mit den im Anspruch 1 angegebenen Merkmalen.This object is achieved by a sewing machine with the features specified in claim 1.
Erfindungsgemäß wurde erkannt, dass eine Fadenzieheinrichtung zwischen dem Fadenhebel und der Oberfaden-Spannungseinrichtung zur Möglichkeit führt, einen bei einer Abwärtsbewegung des Fadenhebels entstehenden Fadenüberschuss zurückzuziehen und mithilfe des Fadenhebels den Oberfaden beim Nähen des Nahtanfangs anschließend so weit im Nähgut zurückzuziehen, dass das freie Ende des Oberfadens am Nahtanfang nur noch gering aus dem Nähgut heraussteht. Der Oberfaden wird dabei um eine Länge zurückgezogen, die der Fadenweg-Differenz, die über die Fadenzieheinrichtung herbeigeführt wird, entspricht. Zudem kann das den Beginn des Oberfadens darstellende freie Ende des Oberfadens unter das Nähgut gezogen werden, so dass es nicht die Optik des vernähten Nähguts beeinträchtigt. Es resultiert ein optisch gefälliger Nahtanfang, ohne dass die Notwendigkeit besteht, das herausstehende freie Ende des Oberfadens durch Abschneiden weiter zu verkürzen. Dies ist insbesondere bei Anwendungen von Vorteil, bei denen die optische Nahtqualität von besonderem Interesse ist, beispielsweise beim Vernähen von Leder bei Innenraumkomponenten eines Kraftfahrzeugs. Die Oberfaden-Spannungseinrichtung kann aufgeteilt sein in eine Oberfaden-Hauptspannungseinrichtung und eine Oberfaden-Vorspannungs- oder Zusatzspannungseinrichtung. Die Oberfaden-Haupt-Spannungseinheit, die gemeinsam mit dem Fadenhebel einen Bereich des Oberfadenverlaufs vorgibt, in dem die Fadenzieheinrichtung angeordnet ist, ist Bestandteil der Oberfaden-Hauptspannungseinrichtung, also nicht Bestandteil der Oberfaden-Vorspannungs- oder Zusatzspannungseinrichtung.According to the invention, it has been recognized that a thread pulling device between the thread lever and the upper thread tensioning device leads to the possibility of withdrawing a thread excess resulting from a downward movement of the thread lever and then withdrawing the upper thread during sewing of the seam beginning so far in the sewing material by means of the thread lever that the free end of the Upper thread at the seam beginning only slightly protrudes from the fabric. The upper thread is thereby withdrawn by a length corresponding to the thread path difference, which is brought about by the thread pulling device. In addition, the free end of the upper thread representing the beginning of the upper thread can be pulled under the sewing material, so that it does not affect the appearance of the sewn sewing material. The result is a visually pleasing seam beginning, without the need to further shorten the protruding free end of the upper thread by cutting. This is especially true in applications advantageous in which the optical seam quality is of particular interest, for example, when sewing leather in interior components of a motor vehicle. The upper thread tensioning means may be divided into one upper thread main tensioning device and upper thread biasing or auxiliary tensioning device. The upper thread main tension unit, which together with the thread lever predefines an area of the upper thread course in which the thread pulling device is arranged, forms part of the upper thread main tensioning device, ie not part of the upper thread tensioning or additional tensioning device.
Eine Fadenzieheinrichtung nach Anspruch 2 kann mit geringem baulichen Aufwand in eine Oberfadenführung integriert werden. Alternativ ist es möglich, die Fadenzieheinrichtung mit einer geradlinig quer zum Fadenlauf verlagerbaren Fadenöse auszubilden. Ein Antrieb zum Verlagern der Fadenöse kann mittels eines Hubzylinders oder eines Hubmagneten erfolgen. Ein Positionierantrieb für den Ausleger der Fadenzieheinrichtung kann einen Schrittmotor aufweisen.A thread pulling device according to
Eine Ösenanordnung nach Anspruch 3 optimiert die fadenziehende Wirkung der Fadenzieheinrichtung. Bevorzugt sind die beiden gehäusefesten Faden-Führungsösen im Fadenverlauf nahe der schwenkbaren Fadenöse angeordnet. Ein Abstand zwischen der schwenkbaren Fadenöse in der Neutralstellung und den beiden gehäusefesten Faden-Führungsösen kann kleiner sein als 2 cm und kann auch kleiner sein als 1 cm.An eyelet arrangement according to claim 3 optimizes the thread-pulling effect of the thread pulling device. Preferably, the two fixed thread guide eyelets are arranged in the thread path near the pivotable thread eyelet. A distance between the pivotable thread eyelet in the neutral position and the two fixed thread guide eyelets fixed to the housing can be less than 2 cm and can also be less than 1 cm.
Genau eine Oberfadenklemme führt zu einer Verringerung des baulichen Aufwandes und des Steuerungsaufwandes beim Betrieb der Nähmaschine. Eine Anordnung der Oberfaden-Spannungseinrichtung nach Anspruch 5 erleichtert eine Ansteuersequenz beim Betreiben der Fadenzieheinrichtung, da eine Synchronisierung eines Betriebs der Oberfaden-Spannungseinrichtung mit dem Betrieb der Fadenzieheinrichtung nicht erforderlich ist.Exactly an upper thread clamp leads to a reduction of the construction costs and the control effort when operating the sewing machine. An arrangement of the upper thread tensioning device according to
Alternativ ist eine Ausgestaltung mit mehreren Oberfaden-Haupt-Spannungseinheiten nach Anspruch 6 möglich. Eine solche Gestaltung der Oberfaden-Spannungseinrichtung führt zu einer sicheren und definierten Fadenspannung im Nähbetrieb. Die Fadenzieheinrichtung kann dann zwischen den Oberfaden-Haupt-Spannungseinheiten angeordnet sein. Dort ist in der Regel ein ausreichender Bauraum zur Unterbringung der Fadenzieheinrichtung gegeben.Alternatively, a configuration with a plurality of upper thread main tension units according to claim 6 is possible. Such a configuration of the upper thread tensioning device leads to a secure and defined thread tension in the sewing operation. The thread pulling device can then be arranged between the upper thread main tension units. There is usually sufficient space to accommodate the Fadenzieheinrichtung given.
Die Vorteile eines Verfahrens nach Anspruch 7 und 8 entsprechen denen, die vorstehend im Zusammenhang mit der Vorrichtung bereits erläutert wurden. Die Gegen-Drehposition kann nach einer Umdrehung der Greiferspitze um mindestens 180° nach der Erfassungs-Drehposition erreicht sein, beispielsweise nach einer Umdrehung der Greiferspitze um 240° oder 245°. Aufgrund der Beibehaltung der Fadenklemmstellung während zumindest eines Teils der Greiferdrehung nach dem Erfassen des Oberfadens durch den Greifer wird erreicht, dass das Oberfadenende am Nahtanfang mit dem Greifer durch das Nähgut nach unten gezogen wird. Das Anziehen des Oberfadens beim Umstellen der Fadenzieheinrichtung von der Neutralstellung in die Fadenziehstellung führt dazu, dass der Fadenhebel dann, wenn er sich nachfolgend wieder hebt, bei freigegebener Oberfadenklemme den Oberfaden am Nahtanfang um den durch die Wegdifferenz des Oberfadens, der durch die Umstellung der Fadenzieheinrichtung herbeigeführt wird, vorgegebenen Längenbetrag zurückzieht. Das Umstellen der Fadenzieheinrichtung von der Neutralstellung in die Fadenziehstellung kann während des ersten Stichs des Nahtanfangs erfolgen. Das Umstellen kann alternativ während des zweiten Stichs, während des dritten Stichs oder auch während eines noch späteren Stichs beim Nähen des Nahtanfangs erfolgen. Das Rückstellen der Fadenzieheinrichtung von der Fadenziehstellung in die Neutralstellung kann während des weiteren Nähens in kleinen Schritten inkrementweise erfolgen. Das Rückstellen kann auch bei Beendigung des Nähvorgangs erfolgen. Das Umstellen in die Neutralstellung kann beispielsweise bei einem abschließenden Faden-Schneidvorgang der Nähmaschine erfolgen.The advantages of a method according to
Beim Verfahren nach Anspruch 9 ist sichergestellt, dass die Fadenzieheinrichtung den Oberfaden vom Fadenhebel her zieht und damit erwünscht den Oberfaden aus dem Nähgut zurückzieht. In der Minder-Spannungsstellung kann die Oberfaden-Haupt-Spannungseinheiten zwischen dem Fadenhebel und der Fadenzieheinrichtung den Oberfaden unter eine im Vergleich zur Normalspannung reduzierte Restfadenspannung setzen. Alternativ kann beim Umstellen der Fadenzieheinrichtung von der Neutralstellung in die Fadenziehstellung die Oberfaden-Haupt-Spannungseinheiten zwischen dem Fadenhebel und der Fadenzieheinrichtung komplett deaktiviert werden.In the method according to
Ein Entlasten eines Stoffdrückers nach Anspruch 10 verhindert, dass beim Ziehen des Oberfadens durch das Nähgut nach unten durch den Greifer der Oberfaden unerwünscht vom Stoffdrücker eingeklemmt ist.Relieving a fabric presser according to claim 10 prevents that when pulling the upper thread through the fabric down through the gripper of the upper thread is undesirable clamped by the fabric presser.
Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der Zeichnung näher erläutert. In dieser zeigen:
- Fig. 1
- eine perspektivische Vorderansicht einer Nähmaschine;
- Fig. 2
- gegenüber
Fig. 1 vergrößert Details einer Oberfadenführung der Nähmaschine nachFig. 1 in einer Armwellenstellung "0° Nadelstange oberer Totpunkt"; - Fig. 3
- gegenüber
Fig. 1 vergrößert Details einer Oberfadenführung der Nähmaschine nachFig. 1 in einer Armwellenstellung "205° Schleifenhub"; - Fig. 4
- schematisch einen vertikalen Schnitt durch ein doppellagiges Nähgut längs einer durch einen Oberfaden und einen Unterfaden vorgegebenen Nahtebene, wobei ein Anfangs-Nahtabschnitt mit einem freien Oberfadenende sichtbar ist;
- Fig. 5
- gegenüber
Fig. 1 vergrößert Details einer Oberfadenführung der Nähmaschine nachFig. 1 in einer Armwellenstellung "300° Deaktivierung Oberfadenklemme und Oberfadenzug durch Greifer (Fadenhebel im unteren Totpunkt)"; - Fig. 6
- gegenüber
Fig. 1 vergrößert Details einer Oberfadenführung der Nähmaschine nachFig. 1 in einer Armwellenstellung "325° aktivierte Fadenzieheinrichtung"; - Fig. 7
- gegenüber
Fig. 1 vergrößert Details einer Oberfadenführung der Nähmaschine nachFig. 1 in einer Armwellenstellung "60° Fadenhebel oberer Totpunkt"; - Fig. 8 bis 12
- Details einer Oberfadenführung einer weiteren Ausführung der Nähmaschine mit zusätzlicher Oberfaden-Haupt-Spannungseinheit in einer den
Fig. 2 ,3 und5 bis 7 entsprechenden Sequenz von Armwellenstellungen.
- Fig. 1
- a front perspective view of a sewing machine;
- Fig. 2
- across from
Fig. 1 enlarges details of a top thread guide of the sewing machineFig. 1 in an arm shaft position "0 ° needle bar top dead center"; - Fig. 3
- across from
Fig. 1 enlarges details of a top thread guide of the sewing machineFig. 1 in an arm shaft position "205 ° loop stroke"; - Fig. 4
- schematically a vertical section through a two-ply fabric along a given by an upper thread and a lower thread sewing plane, wherein an initial seam portion is visible with a free upper thread end;
- Fig. 5
- across from
Fig. 1 enlarges details of a top thread guide of the sewing machineFig. 1 in arm arm position "300 ° deactivation Upper thread clamp and upper thread pull by gripper (thread lever at bottom dead center)"; - Fig. 6
- across from
Fig. 1 enlarges details of a top thread guide of the sewing machineFig. 1 in a arm shaft position "325 ° activated thread pulling device"; - Fig. 7
- across from
Fig. 1 enlarges details of a top thread guide of the sewing machineFig. 1 in an arm shaft position "60 ° thread lever top dead center"; - 8 to 12
- Details of an upper thread guide of another embodiment of the sewing machine with additional upper thread main tension unit in a
Fig. 2 .3 and5 to 7 corresponding sequence of arm shaft positions.
Eine Nähmaschine 1 hat einen oberen Arm 2 und eine untere gehäuseartige Grundplatte 3, die durch einen Ständer 4 zu einem C-förmigen Gehäuse miteinander verbunden sind. Im Arm 2 ist eine Armwelle 5 (vgl.
In der Grundplatte 3 ist ein Greifer 10 angeordnet, der in üblicher Weise abgeleitet von der Armwelle 5 um eine vertikale Drehachse 11 (vgl.
Ein Durchgangsort des Oberfadens 9 durch die erste Oberfadenklemme 14 kann mithilfe einer Mehrzahl von Faden-Durchgangsöffnungen 17 im Grundkörper 16 vorgegeben werden. Bei der in der Zeichnung dargestellten Ausführung verläuft der Oberfaden 9 in der zweiten Faden-Durchgangsöffnung 17 von rechts von insgesamt fünf quer zur Fadentransportrichtung angeordneten Faden-Durchgangsöffnungen.A passage location of the
Stromaufwärts der ersten Oberfadenklemme 14 ist ein Fadenhebel 18 angeordnet, dessen Auf- und Abwärtsbewegung ebenfalls von der Armwelle 5 in an sich bekannter Weise abgeleitet wird. Zwischen einer am freien Ende des Fadenhebels 18 angeordneten Fadenhebelöse 19 und der ersten Oberfadenklemme 14 verläuft der Oberfaden 9 noch durch eine Führungsöse 20, die am in der
Stromaufwärts des Fadenhebels 18 durchläuft der Oberfaden 9 eine Oberfaden-Hauptspannungseinrichtung 21. Letztere hat bei der Ausführung nach den
Zwischen der Oberfaden-Hauptspannungseinrichtung 21 und dem Fadenhebel 18 durchläuft der Oberfaden 9 eine weitere, quer zur Oberfadentransportrichtung einstellbar verlagerbare Führungsöse 23. Zwischen der Führungsöse 23 und der Oberfaden-Hauptspannungseinrichtung 21 durchläuft der Oberfaden 9 eine Faden-Zugfedereinheit 23a.Between the upper thread
Zwischen dem Fadenhebel 18 und der Oberfaden-Hauptspannungseinrichtung 21, genauer gesagt zwischen der Faden-Zugfedereinheit 23 a und der Oberfaden-Haupt-Spannungseinheit 22, ist im Verlauf des Oberfadens 9 eine Fadenzieheinrichtung 24 angeordnet. Die Fadenzieheinrichtung 24 hat einen schwenkbaren Ausleger 25, der über ein Schwenkgelenk 26 an einer Montageplatte 26a angelenkt ist, die ihrerseits am Arm 2 befestigt ist. Die Fadenzieheinrichtung 24 ist also an der Montageplatte 26a montiert. An seinem freien Ende hat der Ausleger 25 der Fadenzieheinrichtung 24 eine Fadenöse 27, die quer zum Fadenlauf des Oberfadens 9 zwischen zwei an der Montageplatte 26a angebrachten gehäusefesten Führungsösen 28 auslenkbar ist. Der Ausleger 25 ist umstellbar zwischen einer in der
Die beiden gehäusefesten Führungsösen 28 bewirken, dass unabhängig davon, ob der Ausleger 25 in der Fadenziehstellung oder in der Neutralstellung ist, der Oberfaden 9 außerhalb des Verlaufs zwischen den beiden gehäusefesten Führungsösen 28 jeweils den gleichen Verlauf nimmt.The two housing-fixed guide eyelets 28 cause regardless of whether the
Der Ausleger 25 ist zwischen der Neutralstellung und der Fadenziehstellung umstellbar durch einen elektromagnetischen Antrieb, der wiederum mit der Steuereinrichtung 6 in Signalverbindung steht. Alternativ zu einem elektromagnetischen Antrieb kann der Ausleger 25 auch pneumatisch oder durch einen Schrittmotor angetrieben sein.The
Stromaufwärts der Oberfaden-Hauptspannungseinrichtung 21 ist eine Oberfaden-Vorspannungseinrichtung 29 angeordnet, die ebenfalls in an sich bekannter Weise arbeitet und mit der Steuereinrichtung 6 in Signalverbindung stehen kann. Die Oberfaden-Hauptspannungseinrichtung 21 mit dem Hauptspannungsgeber 22 und die Oberfaden-Vorspannungseinrichtung 29 sind an der Montageplatte 26a angebracht, die wiederum am Arm 2 montiert ist (vgl.
Stromaufwärts der Oberfaden-Vorspannungseinrichtung 29 durchtritt der Oberfaden 9 eine Faden-Durchgangsöffnung 31, die in der Montageplatte 26a in einem in der
Die
Eine Nähgutebene ist durch eine Auflageposition von Nähgut 34 (vgl.
In der Stellung 0° ist die Oberfadenklemme 14 in der Fadenfreigabestellung. Die Oberfaden-Hauptspannungseinrichtung 21 ist aktiviert. Die Fadenzieheinrichtung 24 ist in der Neutralstellung. Die Oberfaden-Vorspannungseinrichtung 29 ist aktiviert. Der Fadenhebel 18 ist auf dem Weg vom unteren Totpunkt nach oben.In
Die
In der Stellung 205° erfolgt eine Aktivierung der Oberfadenklemme 14 in die Fadenklemmstellung. Die Oberfaden-Hauptspannungseinrichtung 21 ist aktiviert. Die Fadenzieheinrichtung 24 ist in der Neutralstellung. Die Oberfaden-Vorspannungseinrichtung 29 ist aktiviert. Der Fadenhebel 18 befindet sich auf seinem Weg zum unteren Totpunkt. Der Fadenhebel 18 ist schon von seinem oberen Totpunkt entfernt, so dass zwischen der Oberfadenklemme 14 und der Oberfaden-Hauptspannungseinrichtung 21 ein Fadenüberschuss resultiert, der Faden dort also nicht gespannt vorliegt, wie in der
Die Oberfadenklemme 14 ist nun in die Fadenfreigabestellung überführt. Die Oberfaden-Hauptspannungseinrichtung 21 ist aktiviert und hält den Oberfaden 9 unter Spannung. Der Ausleger 25 der Fadenzieheinrichtung 24 ist in der Neutralstellung. Die Oberfaden-Vorspannungseinrichtung 29 ist aktiviert. In der Stellung 300° ist das freie Ende 36 des Oberfadens 9 durch den Greifer 10 weiter nach unten gezogen worden.The
Auf dem Weg zwischen der Armwellenstellung 205° und der Armwellenstellung 300° zieht der Greifer 10 ein freies Ende 36 des Oberfadens 9 durch das Nähgut 34 nach unten. Im weiteren Verlauf der Armwellendrehung zieht der Fadenhebel 18 den Oberfaden 9 im Nähgut 34 zurück, wie aus der nachfolgenden Beschreibung noch deutlicher wird. Das freie Ende 36 steht dann um einen entsprechend geringeren Betrag der Fadenlänge aus dem Nähgut 34 heraus.On the way between the arm shaft position 205 ° and the
In der Stellung 325° ist die Oberfadenklemme 14 in der Fadenfreigabestellung. Die Oberfaden-Hauptspannungseinrichtung 21 ist aktiviert. Der Ausleger 25 der Fadenzieheinrichtung 24 ist nun umgestellt in die Fadenziehstellung.In position 325 °, the
Die Fadenhebelöse 19 ist in der Stellung 325° in einer beginnenden Aufwärtsbewegung nach dem unteren Totpunkt. Durch die Umstellung der Fadenzieheinrichtung 24 in die Fadenziehstellung ist der Oberfadenüberschuss, der in der Stellung nach der
In der Stellung 325° hat sich auch der Greifer 10 gegenüber der Stellung nach
Ein Betrieb der Fadenzieheinrichtung 24 beginnt in der Armwellenstellung 0° nach
Nach dem erstmaligen Umstellvorgang der Fadenzieheinrichtung 24 von der Neutralstellung in die Fadenziehstellung und zurück wird die Statusinformation "Nahtanfang" in der Steuereinrichtung 6 umgesetzt in "laufende Naht". Eine erneute Umstellung in "Nahtanfang" erfolgt nach einem Fadenabschneidvorgang über die Steuereinrichtung 6. Diese Statusinformation wird während des weiteren Nähvorgangs abgefragt. Die Fadenzieheinrichtung 24 wird nur betätigt, wenn die Statusinformation "Nahtanfang" vorliegt. Am Ende des Nähvorgangs und gegebenenfalls nach erfolgtem Fadenabschneiden wird die Fadenzieheinrichtung 24 wieder in die Neutralstellung zurückgestellt. Dies kann, wie vorstehend schon erwähnt, auch während der Nahtbildung inkrementweise geschehen.After the first switching operation of the
Die Länge des über das Nähgut 34 überstehenden freien Endes 36 kann durch die Winkelstellung des Auslegers 25 in der Fadenziehstellung vorgegeben werden. In der Steuereinrichtung 6 können insbesondere dann, wenn der Ausleger 25 über einen Schrittmotor angetrieben ist, mehrere Anfangsfadenlängen vorgewählt werden. Je nach der gewählten Anfangsfadenlänge resultiert die von der Steuereinrichtung 6 angesteuerte Winkelstellung des Auslegers 25 in der Fadenziehstellung. Eine Fadenziehlänge, die zu einer entsprechenden Anfangsfadenlänge führt, kann alternativ auch über einen mechanischen Anschlag für den Ausleger 25 eingestellt werden.The length of the over the
Der gesamte Ablauf des ersten Stichs am Nahtanfang, während dem die Fadenzieheinrichtung 24 von der Neutralstellung in die Fadenziehstellung und zurück umgestellt wird, erfolgt bei einer festgelegten Armwellendrehzahl, die gegenüber der sonstigen Betriebsdrehzahl der Armwelle 5 reduziert ist. Auch diese reduzierte Armwellendrehzahl wird von der Steuereinrichtung 6 vorgegeben.The entire sequence of the first stitch at the beginning of the seam, during which the
Mit anderen Worten kann das Verfahren zum Nähen des Nahtanfangs folgendermaßen beschrieben werden: Zunächst wird die Oberfadenschleife ausgebildet. Anschließend wird die Oberfadenschleife mit der Greiferspitze des Greifers 10 in einer Erfassungs-Drehposition der Greiferspitze erfasst. Anschließend wird der Oberfaden 9 mit der Greiferspitze des Greifers 10 während einer Umdrehung der Greiferspitze des Greifers 10 um das Greifergehäuse des Greifers 10 um etwa 240° bis 250°, insbesondere um 245°, bis zum Erreichen einer der Erfassungs-Drehposition gegenüberliegenden Gegen-Drehposition ausgezogen. Ab der Erfassungs-Drehposition dreht sich die Greiferspitze des Greifers 10 bis zur Gegen-Drehposition also um mindestens eine halbe Umdrehung um das Greifergehäuse des Greifers 10. Nach dem Erreichen der Gegen-Drehposition der Greiferspitze des Greifers 10 wird die Fadenzieheinrichtung 24 von der Neutralstellung in die Fadenziehstellung umgestellt.In other words, the method for sewing the seam beginning can be described as follows. First, the upper thread loop is formed. Subsequently, the upper thread loop is grasped with the looper tip of the
Die Fadenwegdifferenz, die durch die Umstellung des Auslegers 25 zwischen der Neutralstellung und der Fadenziehstellung herbeigeführt wird, kann abhängig von einer Dicke des Nähguts 34 vorgegeben werden. Die Dicke des Nähguts 34 kann vom Benutzer eingestellt werden oder kann von einem in der Zeichnung nicht dargestellten Dickensensor gemessen werden. Zur Verarbeitung des gemessenen Nähgutdicken-Werts und zur Weitergabe eines Fadenweg-Differenz-Sollwerts an die Fadenzieheinrichtung 24 kann die Steuereinrichtung 6 auch mit dem Nähgut-Dickensensor in Signalverbindung stehen.The Fadenwegdifferenz, which is brought about by the conversion of the
Der Hauptspannungsgeber 22 kann für einen Fadenabschneidvorgang am Ende des Nähvorgangs gelüftet werden, sodass am Ort des Hauptspannungsgebers 22 keine Fadenspannung vorliegt. Während des Nähvorgangs erzeugt der Hauptspannungsgeber 22 die zum Nähen erforderliche Fadenspannung. Im Zusammenspiel mit dem Umstellen der Fadenzieheinrichtung 24 von der Neutralstellung in die Fadenziehstellung kann der Hauptspannungsgeber 22 in eine Fadenklemmstellung überführt werden, sodass sichergestellt ist, dass der Oberfaden 9 vom freien Ende 36 her zurückgezogen wird. Diese Fadenklemm-Funktion des Hauptspannungsgebers 22 kann bei Nähaufgaben, bei denen der Oberfaden 9 im Nähgut einer hohen Reibung ausgesetzt ist, genutzt werden.The
Anhand der
Eine Oberfaden-Hauptspannungseinrichtung 38 der Ausführung nach den
Das Nähen eines Nahtanfangs, bei dem zunächst das freie Ende 36 des Oberfadens 9 durch das Nähgut 34 nach unten und dann der Fadenhebel 18 den Oberfaden 9 im Nähgut 34 aufgrund des Einsatzes der Fadenzieheinrichtung 24 zurückzieht, erfolgt bei der Ausführung nach den
Ansonsten entspricht der Betrieb der Nähmaschine mit der Oberfadenführung nach den
Claims (10)
gekennzeichnet durch
marked by
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011005198A DE102011005198A1 (en) | 2011-03-07 | 2011-03-07 | Sewing machine and method for sewing a seam beginning with such a sewing machine |
Publications (2)
Publication Number | Publication Date |
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EP2497852A1 true EP2497852A1 (en) | 2012-09-12 |
EP2497852B1 EP2497852B1 (en) | 2013-11-13 |
Family
ID=45656368
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP20120156449 Not-in-force EP2497852B1 (en) | 2011-03-07 | 2012-02-22 | Sewing machine and method for sewing a beginning of a seam with a sewing machine of this type |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2497852B1 (en) |
JP (1) | JP3175658U (en) |
KR (1) | KR200482460Y1 (en) |
CN (1) | CN202530278U (en) |
DE (1) | DE102011005198A1 (en) |
TW (1) | TWM445592U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI787232B (en) * | 2017-01-26 | 2022-12-21 | 德商都寇帕鷹股份有限公司 | Method of producing a seam beginning needle thread and sewing machine configured to implement a method of this type |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102012221060B3 (en) | 2012-11-19 | 2014-02-06 | Dürkopp Adler AG | sewing machine |
DE202012011059U1 (en) * | 2012-11-19 | 2014-02-20 | Dürkopp Adler AG | sewing machine |
DE102017206499B3 (en) * | 2017-04-18 | 2018-05-03 | Dürkopp Adler AG | sewing machine |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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FR2091594A5 (en) * | 1970-05-14 | 1972-01-14 | Union Special Machine Co | |
US5931107A (en) * | 1997-12-22 | 1999-08-03 | Mcdonnell Douglas Corporation | Advanced stitching head for making stitches in a textile article having variable thickness |
DE10234251C1 (en) | 2002-07-27 | 2003-10-09 | Duerkopp Adler Ag | Sewing machine stitching mechanism relaxes the pressure on the fabric by the presser foot, when the upper thread is clamped between the needle and thread lever on the first seam stitch, for an extended duration with a thicker fabric |
DE102008016774A1 (en) * | 2007-03-29 | 2008-10-02 | Juki Corp., Chofu | Sewing machine with pressure foot, includes coupling mechanism and regulation section moved in correspondence with vertical foot movement |
EP2028311A2 (en) | 2007-08-22 | 2009-02-25 | Dürkopp Adler Aktiengesellschaft | Sewing machine and method for sewing a beginning of a seam with such a sewing machine |
Family Cites Families (7)
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DE2815297C2 (en) * | 1978-04-08 | 1983-01-13 | Dürkoppwerke GmbH, 4800 Bielefeld | Controlled thread clamp of a sewing machine, arranged in the area between the thread lever and the eye of the needle and acting on at least one needle thread |
US4566396A (en) * | 1984-09-27 | 1986-01-28 | Tokyo Juki Industrial Co., Ltd | Thread feed mechanism in sewing machine |
DE3604299A1 (en) * | 1985-04-16 | 1986-10-16 | Kochs Adler Ag, 4800 Bielefeld | METHOD FOR PULLING THE FREE THREADING END OF A NEEDLE THREAD FROM THE TOP OF A SEWING MATERIAL ON ITS BASE AND DEVICE FOR IMPLEMENTING THE METHOD |
JPH0648196B2 (en) * | 1987-07-13 | 1994-06-22 | シャープ株式会社 | Noise reduction circuit for measuring instruments |
DE4132991C1 (en) * | 1991-10-04 | 1992-12-03 | Duerkopp Adler Ag, 4800 Bielefeld, De | Producing seam having short thread ends on bottom of workpiece - involves drawing back needle thread from underside of workpiece so that only short thread piece remains on underside |
JPH06134162A (en) * | 1992-10-28 | 1994-05-17 | Juki Corp | Upper thread supply controller for sewing machine |
KR100515898B1 (en) * | 2004-01-15 | 2005-09-21 | 코베스트 주식회사 | Rotary shuttle device for sewing machine |
-
2011
- 2011-03-07 DE DE102011005198A patent/DE102011005198A1/en not_active Withdrawn
-
2012
- 2012-02-22 EP EP20120156449 patent/EP2497852B1/en not_active Not-in-force
- 2012-03-02 JP JP2012001178U patent/JP3175658U/en not_active Expired - Fee Related
- 2012-03-06 TW TW101204006U patent/TWM445592U/en not_active IP Right Cessation
- 2012-03-07 CN CN2012200835869U patent/CN202530278U/en not_active Expired - Fee Related
- 2012-03-07 KR KR2020120001759U patent/KR200482460Y1/en active IP Right Grant
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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FR2091594A5 (en) * | 1970-05-14 | 1972-01-14 | Union Special Machine Co | |
US5931107A (en) * | 1997-12-22 | 1999-08-03 | Mcdonnell Douglas Corporation | Advanced stitching head for making stitches in a textile article having variable thickness |
DE10234251C1 (en) | 2002-07-27 | 2003-10-09 | Duerkopp Adler Ag | Sewing machine stitching mechanism relaxes the pressure on the fabric by the presser foot, when the upper thread is clamped between the needle and thread lever on the first seam stitch, for an extended duration with a thicker fabric |
DE102008016774A1 (en) * | 2007-03-29 | 2008-10-02 | Juki Corp., Chofu | Sewing machine with pressure foot, includes coupling mechanism and regulation section moved in correspondence with vertical foot movement |
EP2028311A2 (en) | 2007-08-22 | 2009-02-25 | Dürkopp Adler Aktiengesellschaft | Sewing machine and method for sewing a beginning of a seam with such a sewing machine |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI787232B (en) * | 2017-01-26 | 2022-12-21 | 德商都寇帕鷹股份有限公司 | Method of producing a seam beginning needle thread and sewing machine configured to implement a method of this type |
Also Published As
Publication number | Publication date |
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TWM445592U (en) | 2013-01-21 |
KR20120006388U (en) | 2012-09-17 |
KR200482460Y1 (en) | 2017-01-25 |
EP2497852B1 (en) | 2013-11-13 |
DE102011005198A1 (en) | 2012-09-13 |
CN202530278U (en) | 2012-11-14 |
JP3175658U (en) | 2012-05-24 |
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