EP2138620B1 - Sewing machine and method for operating same - Google Patents
Sewing machine and method for operating same Download PDFInfo
- Publication number
- EP2138620B1 EP2138620B1 EP20090007123 EP09007123A EP2138620B1 EP 2138620 B1 EP2138620 B1 EP 2138620B1 EP 20090007123 EP20090007123 EP 20090007123 EP 09007123 A EP09007123 A EP 09007123A EP 2138620 B1 EP2138620 B1 EP 2138620B1
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- EP
- European Patent Office
- Prior art keywords
- pressure
- fabric
- sewing machine
- pressure bar
- servomotor
- 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.)
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- 238000009958 sewing Methods 0.000 title claims description 65
- 238000000034 method Methods 0.000 title claims description 15
- 239000004744 fabric Substances 0.000 claims description 69
- 230000005540 biological transmission Effects 0.000 claims description 33
- 230000033001 locomotion Effects 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 4
- 230000003993 interaction Effects 0.000 claims 4
- 238000011156 evaluation Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 10
- 230000001419 dependent effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000011017 operating method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 206010003402 Arthropod sting Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B27/00—Work-feeding means
- D05B27/24—Feed-dog lifting and lowering devices
Definitions
- the invention relates to a sewing machine according to the preamble of claim 1.
- pressurization for the at least one fabric presser bar via a servomotor, in particular via a stepper motor, and a transmission lever represent a surprisingly simple design variant for flexible pressure generation on the at least one fabric presser bar.
- the pressure generation on the at least one fabric presser rod is carried out according to the invention independently of the drive of the sticherzeugungsmittel. This provides new degrees of freedom in the operation of the at least one fabric presser bar during sewing operation.
- a compressed air motor can basically be used as a servomotor.
- the servomotor can be designed as a stepper motor.
- Such a stepper motor is a cost effective variant of Servomotor according to the invention.
- a standard stepper motor can be used.
- the adaptation of the required torque for generating pressure on the at least one Stoffd Wegerstange to the output torque of the motor can be done by means of a corresponding deflection of the transmission lever.
- the adaptation of the required torque can also be done by a corresponding control of the stepper motor.
- the control of the stepper motor can be done programmatically.
- a driver according to claim 2 in addition to a defined via the servo motor pressure generation on the at least one fabric presser rod also for the possibility of a defined lifting of the at least one fabric presser bar.
- This can for example be used to adapt to different Nähgutdicken or for ventilating the at least one Stoffd Wegerstange.
- at least two fabric presser rods interact with corresponding drivers, an alternating operation of the two fabric presser rods is possible.
- Two fabric presser rods according to claim 3 lead to the possibility of sewing over a controlled slip difference set an arcuate seam course. An alternating operation between the two pressure-emitting devices of the two fabric presser rods is also possible.
- both pressure generating devices according to claim 4 are designed according to the invention with a servo motor and a transmission lever, this leads to a further extension of the degrees of freedom in the operation of the sewing machine.
- Both transmission levers can with drivers interact so that both pressure-emitting devices can also be raised.
- An arrangement according to claim 5 allows an adjacent arrangement of the two fabric presser rods, so that they can interact with the fabric without major design effort at adjacent locations.
- a revolving fabric conveyor belt according to claim 6 allows a Nähgutvorschub and / or a controlled introduction of sewing material fullness.
- a central control device allows synchronization of the Stoffd Wegerstangenbet Oberist with the Sticherzeugung.
- a flexible and programmable sequence of movement of the fabric presser bars is possible.
- the control of the at least one pressure-generating device can be carried out depending on programmed or during the sewing operation measured parameters.
- a position sensor according to claim 8 allows the measurement of a currently processed with the sewing machine Nähgutdicke. This measured value can then be used to control the sewing machine, in particular for controlling the servomotors.
- a multi-unit transmission mechanism according to claim 9 allows torque adjustment over a wide range.
- Another object of the invention is to provide operating methods which are possible with the aid of the sewing machine according to the invention.
- the pressure exerted on the cloth over the fabric presser bar varies during the stitch. Pressure is applied to the fabric only if this is absolutely necessary for the stitch formation. This reduces the material load and leads to the possibility of an accelerated sewing process. In addition, rotation of the fabric during sewing can be facilitated, resulting in improved fabric handling.
- a yarn tension specification according to claim 11 leads to a particularly economical sewing operation. It is also possible to set the pressure that the at least one fabric pressing rod exerts on the fabric, depending on a predetermined or measured default value.
- a multi-length-dependent stroke specification according to claim 13 takes into account a material crimp when sewing.
- the method of claim 15 allows z. B. the specification of a curved seam course.
- a sewing machine 1 has an upper arm 2 with a machine head 3, a vertical stand not shown in the drawing and a lower housing, which is commonly referred to as a base plate 4.
- the Base 4 has an upwardly projecting column 5, which is why the sewing machine 1 is also referred to as a column sewing machine.
- the sewing machine 1 can be used as a sleeve sewing machine.
- a not shown arm shaft for up and down drive a needle bar, not shown, with needle bar axis 6 is rotatably mounted.
- the drive of the arm shaft via a mounted in the arm 2 drive motor and a belt drive, both of which are not shown in the drawing.
- the needle bar carries at its lower end a needle.
- a gripper is rotatably mounted in the column 5. Sewing parts to be sewn are guided over a stitch hole plate forming the upper side of the column 5, through which the needle passes into the area of the gripper.
- the needle on the one hand and the gripper on the other hand constitute stich generating means of the sewing machine 1.
- a main sewing direction 7 (cf. Fig. 3 ) of the sewing machine 1 serve a lower feed dog assembly 8 and an upper feed slide assembly 9. Also, a feed of the workpieces in a direction opposite to the main sewing direction 7, so in particular a reverse sewing, is possible.
- the lower feed dog assembly 8 has two adjacent lower conveyor belts 10, 11, which are designed as polyurethane-coated timing belt.
- the toothed belts can also be made of an elastomer.
- the conveyor belts 10, 11 are so driven by mounted in the column 5 toothed disks 12 by a common drive 12a, that they move relative to the needle plate in the sewing direction 7 at the same speed.
- This drive 12a of the two lower conveyor belts 10, 11 is for example in the Fig. 1 shown.
- the drive 12a is a servomotor.
- an upper conveyor belt 13, 13a cooperates in each case.
- the lower conveyor belt 10 associated upper conveyor belt 13 is made wider than the lower conveyor belt 11 associated upper conveyor belt 13 a.
- the upper conveyor belts 13, 13a are each designed as a closed endless conveyor belt and also as a polyurethane-coated toothed belt or elastomeric timing belt.
- the upper conveyor belt 13 is deflected via a mounted on a presser foot 14 guide roller.
- the presser foot 14 is a pressure-emitting device of the sewing machine 1, which cooperates via the upper conveyor belt 13 with the workpieces to be sewn, ie with the material to be sewn.
- the upper conveyor belt 13 is driven via a toothed disc 16. This is driven by a belt drive servomotor 17, which is designed as a stepper motor.
- the presser foot 14 is mounted on a first, head-side presser bar 18. This is axially guided in a Stoffstangenbuchse 19, the Machine head 3 is fixed. The presser foot 14 is fixed to the end of the first fabric presser rod 18 at the fabric side. At the opposite, machine-head-side end, the first fabric pressing rod 18 cooperates with a first pressure-generating device 20.
- This has a stepping motor designed as a servomotor 21 and as a transmission mechanism, a transmission lever 22 (see. Fig. 2 and 6 ), which is non-rotatably connected to a motor shaft 23 of the servomotor 21. Radially spaced from the motor shaft 23, the transmission lever 22 is in thrust communication with the machine head end of the first fabric presser bar 18.
- the servomotors 21 may be, in particular, standard stepper motors.
- the transmission lever 22 is a multi-part.
- a first transmission member 24 is rotatably connected to the motor shaft 23.
- the end of the radially extending transmission member 24 is articulated via a connecting joint 25 to a further transmission member 26 of the transmission lever 22.
- the further transmission member 26 is pivotable about a fixedly connected to the machine head 3 pivot joint 27.
- the connection joint 25 opposite end of the transmission member 26 is connected to a driving pin 28, which in turn is set at the machine head end of the first fabric presser rod 18.
- the driving pin 28 ensures that the first presser rod 18 is connected to the pressure-generating device 20 not only in push but also in train connection.
- a further, presser foot 29 on the side of the stand acts on the associated upper conveyor belt 13a to feed intermediate sewing material in the sewing direction 7.
- Different transport speeds of the conveyor belts 13, 13a can by use are achieved by individual toothed pulleys at the location of the toothed disc 16 with different diameters, in which case each of the upper conveyor belts 13, 13a associated with one of these individual toothed pulleys.
- the further presser foot 29 represents the end of the sewing material another, arm-side presser rod 30 is a machine-side end of the further fabric presser rod 30 is connected to another pressure-generating device 31 in push and pull connection.
- Dashed lines indicated symmetry plane 32 corresponds to the structure of the further pressure-generating device 31 mirror-symmetrically substantially the structure of the first pressure-generating device 20, so that only those details are explained below, in which this structure deviates from the mirror symmetry.
- the transmission member 26 of the other pressure generating means 31 is compared with the transmission member 26 of the first pressure generating device 20 with respect to the motor shaft 23 axially offset towards the interior of the machine head 3, so that the two transmission members 26 of the pressure generating means 20, 31 do not interfere with each other ,
- the transfer members 26 provide translation of the torque generated by the transfer members 24 to the cloth presser bars 18, 30.
- the second fabric pressing rod 30 is guided in a cloth bushing 19 in its axial movement.
- the two fabric presser rods 18, 30 and thus also their two machine-head-side ends are arranged directly adjacent to each other.
- the control device 33 is also in signal connection with the servomotor 12a.
- the controller 33 is connected to a in the Fig. 3 schematically indicated position sensor 34 for evaluating a current position of the arm shaft in signal connection.
- the control device 33 is in the servomotors 21 of the pressure-generating devices 20, 31 respectively integrated position sensors for evaluating a current position of the motor shafts 33 in signal communication.
- the two pressure-generating devices 20, 31 can be controlled independently of one another by the control device 33.
- a lifting movement of the driving pins 28 due to the actuation of the pressure-generating devices 20, 31 is guided via a fixed to the machine head 3 slot plate 35.
- the conveyor belts 10, 11 and 13, 13a synchronized with one another provide for advancing the workpieces in the sewing direction 7.
- the two pressure-generating devices 20 and 31 can slip between the conveyor belts 10 and 13 on the one hand and between the conveyor belts 11 and 13a, on the other hand.
- a curvature contribution can be added to the feed in the sewing direction 7, so that a curved in the plane of the fabric seam can be sewn with a dependent on the slip ratio radius of curvature.
- a Köselêt be specified.
- the pressure generating means 20, 31 on the fabric presser bars 18, 30 exercise, ie at a given torque of the servomotors 21, an associated rotational position of the motor shafts 23, which can be detected by the integrated position sensors of the servomotors 21.
- the control device 33 for example, to specify a stitch length or a feed transport speed or a thread tension.
- the pressure exerted by the pressure-generating devices 20, 31 and thus the fabric presser bars 18, 30 on the sewing material can, controlled by the control device 33, during the execution of a stitch according to a pressure default curve, the servomotors 21 via the transmission lever 22 on the fabric presser bars 18, 30 exert to be varied.
- the foot pressure on the two fabric presser rods 18, 30 can be variably specified during a stitch. Since the servomotors 21 operate independently of the arm shaft drive, this pressure default curve can be processed synchronized to the generation of jams, but this is not mandatory. For example, at every other stitch, a pressure according to another pressure default curve or, as far as the stroke of the fabric presser bars 18, 30 is included, be exercised according to a different pressure and motion profile.
- a yarn tension of a sewing thread of the sewing machine 1 may be controlled by the controller 33, depending on the pressure exerted by the pressure generating means 20, 31. Also a pressure specification depending on a default value, in particular of the Armwellenburniere, depending on the stitch length or individually during different stitch segments is possible.
- the pressure-generating devices 20, 31 can also be a stroke of the fabric presser bars 18, 30 during sewing and in particular during a stitch, individually according to a stroke-default curve, the servo motors 21 via the transmission lever 22 convey the fabric presser bars 18, 30 can be varied.
- This hub can, for. Example, to specify a via the conveyor belts 10, 11 and 13 to be created substance fullness in particular dependent on a default value can be set variably.
- the thread tension can be specified. It is also possible to set the stroke dependent on the arm shaft speed.
- the servomotors 21 can also exert a pulling action on the fabric pressing rods 18, 30 via the driving pins 28, a ventilation of the two presser feet 14, 29 is also possible.
- the control device 33 can process previously programmed processes with pressure and stroke default curves.
- control device 33 By means of a corresponding specification by the control device 33, a rapid adjustment of the lifting height which the fabric presser rods 18, 30 carry out during the sewing operation is possible.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
Description
Die Erfindung betrifft eine Nähmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to a sewing machine according to the preamble of claim 1.
Derartige Nähmaschinen sind bekannt aus der
Derartige Nähmaschinen sind hinsichtlich ihrer Betriebsflexibilität und/oder hinsichtlich ihres konstruktivem Aufwandes noch verbesserungsbedürftig.Such sewing machines are still in need of improvement in terms of their operational flexibility and / or in terms of their design effort.
Es ist eine Aufgabe der vorliegenden Erfindung, eine Nähmaschine der eingangs genannten Art derart weiterzubilden, dass ihre Betriebsflexibilität bei vergleichsweise niedrigem konstruktivem Aufwand erhöht ist.It is an object of the present invention, a sewing machine of the type mentioned in such a way that their operational flexibility is increased at a comparatively low design 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 Druckerzeugung für die mindestens eine Stoffdrückerstange über einen Servomotor, insbesondere über einen Schrittmotor, und einen Übertragungshebel eine überraschend einfache konstruktive Variante zur flexiblen Druckerzeugung auf die mindestens eine Stoffdrückerstange darstellt. Die Druckerzeugung auf die mindestens eine Stoffdrückerstange erfolgt erfindungsgemäß unabhängig vom Antrieb der Sticherzeugungsmittel. Dies schafft neue Freiheitsgrade hinsichtlich der Betätigung der mindestens einen Stoffdrückerstange während des Nähbetriebs. Auch ein Druckluftmotor kann grundsätzlich als Servomotor zum Einsatz kommen. Der Servomotor kann als Schrittmotor ausgebildet sein. Ein derartiger Schrittmotor ist eine kostengünstige Variante des erfindungsgemäßen Servomotors. Es kann ein Standard-Schrittmotor eingesetzt werden. Die Anpassung des benötigten Drehmoments zur Druckerzeugung auf die mindestens eine Stoffdrückerstange an das abgegebene Drehmoment des Motors kann mit Hilfe einer entsprechenden Umlenkung des Übertragungshebels erfolgen. Die Anpassung des benötigten Drehmoments kann auch durch eine entsprechende Ansteuerung des Schrittmotors erfolgen. Die Ansteuerung des Schrittmotors kann programmgesteuert erfolgen.According to the invention, it has been recognized that pressurization for the at least one fabric presser bar via a servomotor, in particular via a stepper motor, and a transmission lever represent a surprisingly simple design variant for flexible pressure generation on the at least one fabric presser bar. The pressure generation on the at least one fabric presser rod is carried out according to the invention independently of the drive of the sticherzeugungsmittel. This provides new degrees of freedom in the operation of the at least one fabric presser bar during sewing operation. A compressed air motor can basically be used as a servomotor. The servomotor can be designed as a stepper motor. Such a stepper motor is a cost effective variant of Servomotor according to the invention. A standard stepper motor can be used. The adaptation of the required torque for generating pressure on the at least one Stoffdrückerstange to the output torque of the motor can be done by means of a corresponding deflection of the transmission lever. The adaptation of the required torque can also be done by a corresponding control of the stepper motor. The control of the stepper motor can be done programmatically.
Ein Mitnehmer nach Anspruch 2 führt neben einer über den Servomotor definierten Druckerzeugung auf die mindestens eine Stoffdrückerstange auch zur Möglichkeit eines definierten Anhebens der mindestens einen Stoffdrückerstange. Dies kann beispielsweise zur Anpassung an unterschiedliche Nähgutdicken oder auch zum Lüften der mindestens einen Stoffdrückerstange genutzt werden. Soweit mindestens zwei Stoffdrückerstangen mit entsprechenden Mitnehmern zusammenwirken, ist auch ein alternierender Betrieb der beiden Stoffdrückerstangen möglich.A driver according to
Zwei Stoffdrückerstangen nach Anspruch 3 führen zur Möglichkeit, über eine kontrolliert eingestellte Schlupfdifferenz einen bogenförmigen Nahtverlauf zu nähen. Auch ein alternierender Betrieb zwischen den beiden druckabgebenden Einrichtungen der beiden Stoffdrückerstangen ist möglich.Two fabric presser rods according to
Wenn beide druckerzeugenden Einrichtungen nach Anspruch 4 erfindungsgemäß mit einem Servomotor und einem Übertragungshebel ausgeführt sind, führt dies zu einer nochmaligen Erweiterung der Freiheitsgrade beim Betrieb der Nähmaschine. Beide Übertragungshebel können mit Mitnehmern zusammenwirken, so dass beide druckabgebenden Einrichtungen auch angehoben werden können.If both pressure generating devices according to
Eine Anordnung nach Anspruch 5 ermöglicht eine benachbarte Anordnung der beiden Stoffdrückerstangen, so dass diese ohne größeren konstruktiven Aufwand an benachbarten Stellen mit dem Stoff zusammenwirken können.An arrangement according to
Ein umlaufendes Stoff-Transportband nach Anspruch 6 ermöglicht einen Nähgutvorschub und/oder ein kontrolliertes Einbringen von Nähgut-Mehrweite.A revolving fabric conveyor belt according to
Eine zentrale Steuereinrichtung nach Anspruch 7 ermöglicht eine Synchronisation der Stoffdrückerstangenbetätigung mit der Sticherzeugung. Insbesondere ist ein flexibler und programmierbarer Ablauf der Bewegung der Stoffdrückerstangen möglich. Die Ansteuerung der mindestens einen druckerzeugenden Einrichtung kann abhängig von programmierten oder während des Nähbetriebs gemessenen Parametern erfolgen.A central control device according to
Ein Positionsgeber nach Anspruch 8 ermöglicht die Messung einer momentan mit der Nähmaschine verarbeiteten Nähgutdicke. Dieser Messwert kann dann zur Ansteuerung der Nähmaschine, insbesondere zur Ansteuerung der Servomotoren, genutzt werden.A position sensor according to
Ein mehrgliedriger Übertragungsmechanismus nach Anspruch 9 ermöglicht eine Drehmomentanpassung über einen weiten Bereich.A multi-unit transmission mechanism according to
Eine weitere Aufgabe der Erfindung ist es, Betriebsverfahren anzugeben, die mit Hilfe der erfindungsgemäßen Nähmaschine möglich sind.Another object of the invention is to provide operating methods which are possible with the aid of the sewing machine according to the invention.
Diese Aufgabe ist erfindungsgemäß gelöst durch die Betriebsverfahren mit den Merkmalen nach den Ansprüchen 10, 12 und 15. Mit diesen Betriebsverfahren ist ein verbessertes Nähguthandling bzw. ein qualitativ hochwertiges Nähergebnis erreichbar. Über die Ansteuerung der mindestens einen Stoffdrückerstange über den mindestens einen Servomotor ist einerseits eine Positionierung der druckabgebenden Einrichtungen möglich. Andererseits ist über die Ansteuerung der Stoffdrückerstangen auch beispielsweise eine Federcharakteristik des zeitlichen Druckverlaufs, den die druckabgebenden Einrichtungen auf den Stoff ausüben, einstellbar.This object is achieved by the operating method with the features according to
Beim Betriebsverfahren nach Anspruch 10 wird der Druck, der über die Stoffdrückerstange auf den Stoff ausgeübt wird, während des Stichs variiert. Druck wird auf den Stoff nur dann ausgeübt, wenn dies für die Stichbildung unbedingt erforderlich ist. Dies vermindert die Stoffbelastung und führt zur Möglichkeit eines beschleunigten Nähvorgangs. Zudem kann ein Drehen des Stoffes während des Nähens erleichtert werden, was zu einem verbesserten Nähguthandling führt.In the method of operation of
Eine Fadenspannungsvorgabe nach Anspruch 11 führt zu einem besonders wirtschaftlichen Nähbetrieb. Es ist auch möglich, den Druck, den die mindestens eine Stoffdrückerstange auf den Stoff ausübt, abhängig von einem vorgegebenen oder gemessenen Vorgabewert einzustellen.A yarn tension specification according to
Entsprechende Vorteile hat das Verfahren nach Anspruch 12.Corresponding advantages of the method according to
Eine mehrweitenabhängige Hubvorgabe nach Anspruch 13 berücksichtigt eine Stoffkräuselung beim Nähen.A multi-length-dependent stroke specification according to
Die Vorteile des Verfahrens nach Anspruch 14 entsprechen denen des Verfahrens nach Anspruch 11.The advantages of the method according to
Das Verfahren nach Anspruch 15 ermöglicht z. B. die Vorgabe eines gebogenen Nahtverlaufs.The method of
Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der Zeichnung näher erläutert. In dieser zeigen:
- Fig. 1
- perspektivisch einen Ausschnitt einer Nähmaschine, bei der zur Sichtbarmachung interner Details Gehäuseelemente ab- genommen sowie Komponenten abmontiert sind;
- Fig. 2
- eine bedienerseitige Ansicht des Ausschnitts der Nähmaschi- ne nach
Fig. 1 ; - Fig. 3
- eine Ansicht gemäß Blickrichtung III in
Fig. 2 ; - Fig. 4
- eine Ansicht gemäß Blickrichtung IV in
Fig. 3 ; - Fig. 5
- eine Aufsicht gemäß Blickrichtung V in
Fig. 2 ; und - Fig. 6
- perspektivisch zwei Stoffdrückerstangen der Nähmaschine nach den
Fig. 1 bis 5 mit zwei druckerzeugenden Einrichtun- gen.
- Fig. 1
- perspective view of a section of a sewing machine in which housing elements are removed for the visualization of internal details and components are removed;
- Fig. 2
- a user-side view of the section of the sewing machine after
Fig. 1 ; - Fig. 3
- a view according to viewing direction III in
Fig. 2 ; - Fig. 4
- a view according to viewing direction IV in
Fig. 3 ; - Fig. 5
- a view according to the direction V in
Fig. 2 ; and - Fig. 6
- in perspective, two fabric presser rods of the sewing machine after the
Fig. 1 to 5 with two pressure-generating devices.
Eine Nähmaschine 1 hat einen oberen Arm 2 mit einem Maschinenkopf 3, einen in der Zeichnung nicht dargestellten vertikalen Ständer und ein unteres Gehäuse, das üblicherweise als Grundplatte 4 bezeichnet wird. Die Grundplatte 4 hat eine nach oben ragende Säule 5, weshalb die Nähmaschine 1 auch als Säulen-Nähmaschine bezeichnet wird. Die Nähmaschine 1 kann als Ärmeleinnähmaschine eingesetzt werden.A sewing machine 1 has an
Im Arm 2 ist eine nicht näher dargestellte Armwelle zum auf- und abgehenden Antrieb einer nicht dargestellten Nadelstange mit Nadelstangenachse 6 drehbar gelagert. Der Antrieb der Armwelle erfolgt über einen im Arm 2 montierten Antriebsmotor und einen Riemenantrieb, die beide in der Zeichnung nicht dargestellt sind. Über die Armwelle und einen ebenfalls nicht dargestellten Kurbeltrieb ist die im Arm 2 vertikal gelagerte Nadelstange vertikal auf- und abgehend antreibbar, wobei die Nadelstange an ihrem unteren Ende eine Nadel trägt. Unterhalb der Nadelstange ist in der Säule 5 ein Greifer drehantreibbar gelagert. Zu vernähende Nähgutteile werden über eine die Oberseite der Säule 5 bildende Stichlochplatte geführt, durch die die Nadel in den Bereich des Greifers hindurchtritt. Die Nadel einerseits und der Greifer andererseits stellen Sticherzeugungsmittel der Nähmaschine 1 dar.In
Zum Vorschieben der miteinander zu vernähenden Nähgutteile in einer Haupt-Nährichtung 7 (vgl.
Die untere Stoffschieber-Baugruppe 8 hat zwei nebeneinander laufende untere Transportbänder 10, 11, die als Polyurethan-beschichtete Zahnriemen ausgeführt sind. Die Zahnriemen können auch aus einem Elastomer hergestellt sein. Die Transportbänder 10, 11 werden über in der Säule 5 gelagerte Zahnscheiben 12 von einem gemeinsamen Antrieb 12a so angetrieben, dass sie sich relativ zur Stichplatte in der Nährichtung 7 mit der gleichen Geschwindigkeit bewegen. Dieser Antrieb 12a der beiden unteren Transportbänder 10, 11 ist beispielsweise in der
Mit dem in der
Dort, wo das obere Transportband 13 mit dem unteren Transportband 10 zum Nähgutvorschub zwischenliegender Nähgutteile zusammenwirkt, ist das obere Transportband 13 über eine an einem Drückerfuß 14 gelagerte Umlenkrolle umgelenkt. Der Drückerfuß 14 stellt eine druckabgebende Einrichtung der Nähmaschine 1 dar, die über das obere Transportband 13 mit den zu vernähenden Nähgutteilen, also mit dem zu vernähenden Stoff, zusammenwirkt. Eine weitere Umlenkung des oberen Transportbandes 13 erfolgt über einen am Maschinenkopf 3 festgelegten Ausleger 15. Angetrieben ist das obere Transportband 13 über eine Zahnscheibe 16. Diese wird von einem Bandantriebs-Servomotor 17 angetrieben, der als Schritt-motor ausgeführt ist.There, where the
Der Drückerfuß 14 ist an einer ersten, kopfseitigen Stoffdrückerstange 18 montiert. Diese ist in einer Stoffstangenbuchse 19 axial geführt, die am Maschinenkopf 3 festgelegt ist. Der Drückerfuß 14 ist am nähgutseitigen Ende der ersten Stoffdrückerstange 18 festgelegt. Am gegenüberliegenden, maschinenkopfseitigen Ende wirkt die erste Stoffdrückerstange 18 mit einer ersten druckerzeugenden Einrichtung 20 zusammen. Diese hat einen als Schrittmotor ausgeführten Servomotor 21 und als Übertragungsmechanismus einen Übertragungshebel 22 (vgl.
Wie insbesondere der
Auch die zweite Stoffdrückerstange 30 ist in einer Stoffstangenbuchse 19 in ihrer Axialbewegung geführt.The second
Die beiden Stoffdrückerstangen 18, 30 und damit auch ihre beiden maschinenkopfseitigen Enden sind einander direkt benachbart angeordnet.The two
Über entsprechende Signalverbindungen, die in der Zeichnung nicht dargestellt sind, stehen die beiden Servomotoren 21 der beiden druckerzeugenden Einrichtungen 20, 31, der Bandantriebs-Servomotor 17 und der Antrieb für die Armwelle der Nähmaschine 1 mit einer zentralen Steuereinrichtung 33 (vgl.
Eine Hubbewegung der Mitnehmerbolzen 28 aufgrund der Betätigung der druckerzeugenden Einrichtungen 20, 31 ist über eine am Maschinenkopf 3 festgelegte Langlochplatte 35 geführt.A lifting movement of the driving pins 28 due to the actuation of the pressure-generating
Beim Betrieb der Nähmaschine 1 sorgen die synchronisiert miteinander laufenden Transportbänder 10, 11 und 13, 13a für einen Vorschub der Nähgutteile in der Nährichtung 7. Über die beiden druckerzeugenden Einrichtungen 20 und 31 kann ein Schlupf zwischen den Transportbändern 10 und 13 einerseits und zwischen den Transportbändern 11 und 13a andererseits vorgegeben werden. Je nach dem relativen Schlupf zwischen den Transportbändern 10 und 13 einerseits und den Transportbändern 11 und 13a andererseits kann dem Vorschub in der Nährichtung 7 ein Krümmungsbeitrag hinzugefügt werden, so dass eine in der Ebene des Nähguts gekrümmte Naht mit vom Schlupfverhältnis abhängigem Krümmungsradius genäht werden kann. Über das Verhältnis der Bandlaufgeschwindigkeiten der Bänder 10 und 13 kann zudem, falls gewünscht, ein Kräuselmaß vorgegeben werden.During operation of the sewing machine 1, the
Je nach der Dicke der Nähgutteile zwischen den Transportbändern 10, 13 einerseits und zwischen den Transportbändern 11, 13a andererseits ergibt sich bei gegebenem Druck, den die druckerzeugenden Einrichtungen 20, 31 auf die Stoffdrückerstangen 18, 30 ausüben, also bei gegebenem Drehmoment der Servomotoren 21, eine zugehörige Drehposition der Motorwellen 23, die von den integrierten Positionsgebern der Servomotoren 21 erfasst werden kann. Über die Positionsgeber ist daher eine Messung der momentanen Dicke des Nähgutes möglich. Diese Dickenmessung kann von der Steuereinrichtung 33 beispielsweise zur Vorgabe einer Stichlänge oder einer Vorschub-Transportgeschwindigkeit oder einer Fadenspannung genutzt werden.Depending on the thickness of the workpieces between the
Der Druck, den die druckerzeugenden Einrichtungen 20, 31 und damit die Stoffdrückerstangen 18, 30 auf das Nähgut ausüben, kann, gesteuert durch die Steuereinrichtung 33, während der Durchführung eines Stichs gemäß einer Druck-Vorgabekurve, den die Servomotoren 21 über die Übertragungshebel 22 auf die Stoffdrückerstangen 18, 30 ausüben, variiert werden. Insbesondere kann der Fußdruck über die beiden Stoffdrückerstangen 18, 30 variabel während eines Stichs vorgegeben werden. Da die Servomotoren 21 unabhängig vom Armwellenantrieb arbeiten, kann diese Druck-Vorgabekurve synchronisiert zur Sticherzeugung abgearbeitet werden, dies ist jedoch nicht zwingend. Beispielsweise kann bei jedem zweiten Stich ein Druck gemäß einer anderen Druck-Vorgabekurve oder, soweit auch der Hub der Stoffdrückerstangen 18, 30 einbezogen wird, gemäß einem anderen Druck- und Bewegungsprofil ausgeübt werden.The pressure exerted by the pressure-generating
Eine Fadenspannung eines Nähfadens der Nähmaschine 1 kann abhängig vom Druck, der über die druckerzeugenden Einrichtungen 20, 31 ausgeübt wird, gesteuert über die Steuereinrichtung 33 vorgegeben werden. Auch eine Druckvorgabe abhängig von einem Vorgabewert, insbesondere von der Armwellendrehzahl, abhängig von der Stichlänge oder individuell während verschiedener Stichsegmente ist möglich. Mit den druckerzeugenden Einrichtungen 20, 31 kann zudem ein Hub der Stoffdrückerstangen 18, 30 während des Nähbetriebs und insbesondere während eines Stichs, individuell gemäß einer Hub-Vorgabekurve, den die Servomotoren 21 über die Übertragungshebel 22 den Stoffdrückerstangen 18, 30 vermitteln, variiert werden. Auch dieser Hub kann, z. B. zur Vorgabe einer über die Transportbänder 10, 11 und 13 zu erzeugenden Stoff-Mehrweite insbesondere abhängig von einem Vorgabewert variabel vorgegeben werden. Abhängig von diesem Hub kann beispielsweise auch die Fadenspannung vorgegeben werden. Auch eine Hubvorgabe abhängig von der Armwellendrehzahl ist möglich.A yarn tension of a sewing thread of the sewing machine 1 may be controlled by the
Aufgrund der individuellen Ansteuerbarkeit der beiden Servomotoren 21 ist eine Alternierung des Betriebs der beiden Stoffdrückerstangen 18, 30 möglich.Due to the individual controllability of the two
Da über die Mitnehmerbolzen 28 die Servomotoren 21 auch eine Zugwirkung auf die Stoffdrückerstangen 18, 30 ausüben können, ist hierüber auch eine Lüftung der beiden Drückerfüße 14, 29 möglich.Since the
Die Steuereinrichtung 33 kann vorab programmierte Abläufe mit Druck-und Hub-Vorgabekurven abarbeiten.The
Über eine entsprechende Vorgabe durch die Steuereinrichtung 33 ist eine Schnellverstellung der Hubhöhe, die die Stoffdrückerstangen 18, 30 während des Nähbetriebs vollführen, möglich.By means of a corresponding specification by the
Claims (15)
- Sewing machine (1) comprising- a machine head (3);- at least one pressure bar (18, 30) comprising-- a fabric end, located near a fabric to be sewn, where the pressure bar (18, 30) is connected to a pressure-applying device (14, 29) which is designed for interaction with the fabric;-- a machine end, located near the machine head (3), where the pressure bar (18, 30) interacts with a pressure-generating device (20, 31),characterized in that the pressure-generating device (20, 31) comprises- a servomotor (21);- a transmission lever (22) which is mounted to a motor shaft (23) of the servomotor (21) in a torque-proof manner and which is in push connection at a radial distance from the motor shaft (23) with the machine end of the pressure bar (18, 30).
- Sewing machine according to claim 1, characterized in that the machine end of the at least one pressure bar (18, 30) interacts with an entrainer (28) in such a way that the transmission lever (22) is also in pull connection at a radial distance from the motor shaft (23) with the machine end of the pressure bar (18, 30).
- Sewing machine according to claim 1 or 2, characterized by two pressure bars (18, 30) comprising- in each case one fabric end, located near the fabric, where the pressure bar (18, 30) is connected to a pressure-applying device (14, 29) which is designed for interaction with the fabric;- in each case one machine end, located near the machine head (3), where the pressure bar (18, 30) interacts with in each case one pressure-generating device (20, 31).
- Sewing machine according to claim 3, characterized in that each of the two pressure-generating devices comprises- a servomotor (21);- a transmission lever (22) which is mounted to a motor shaft (23) of the servomotor (21) in a torque-proof manner and which is in push connection at a radial distance from the motor shaft (23) with the machine end of the pressure bar (18, 30).
- Sewing machine according to claim 3 or 4, characterized in that the two pressure-generating devices (20, 31) are arranged in such a way that the portions of the two transmission levers (22), which are in push connection with the machine ends of the pressure bars (18, 30), are directly adjacent to each other.
- Sewing machine according to one of claims 1 to 5, characterized in that the pressure-applying device (14, 29) interacting with the at least one pressure bar (18, 3 0) interacts with a rotating fabric feed belt (13, 13a).
- Sewing machine according to one of claims 1 to 6, characterized in that the at least one servomotor (21) is signally connected with a central control device (33) of the sewing machine (1), with the central control device (33) in turn being signally connected with a sewing machine drive for controlled movement of stitch formation means of the sewing machine.
- Sewing machine according to claim 7, characterized in that the control device (33) is signally connected with a position transducer of the servomotor (21) for evaluation of a current position of the motor shaft (23).
- Sewing machine according to one of claims 1 to 8, characterized in that the transmission lever (22) is designed as a multi-component transmission mechanism and comprises in particular at least two transmission members (24, 26) which are articulated to each other.
- Method of operating a sewing machine comprising- a machine head (3);- at least one pressure bar (18, 30) comprising-- a fabric end, located near a fabric to be sewn, where the pressure bar (18, 30) is connected to a pressure-applying device (14, 29) which is designed for interaction with the fabric;-- a machine end, located near the machine head (3), where the pressure bar (18, 30) interacts with a pressure-generating device (20, 31),- wherein the pressure-generating device (20, 31) comprises-- a servomotor (21);-- a transmission lever (22) which is mounted to a motor shaft (23) of the servomotor (21) in a torque-proof manner and which is in push connection at a radial distance from the motor shaft (23) with the machine end of the pressure bar (18, 30), characterized in that the pressure exerted on the fabric by the pressure bar (18, 30) varies during the formation of a stitch with respect to a set pressure curve exerted on the pressure bar (18, 30) by means of the servomotor (21) via the transmission lever (22).
- Method according to claim 10, characterized in that a thread tension is specified depending on a pressure exerted on the fabric by the at least one pressure bar (18, 30).
- Method of operating a sewing machine according to one of claims 1 to 9, characterized in that the stroke performed by the pressure bar (18, 30) during a stitch varies with respect to a set stroke curve transmitted to the pressure bar (18, 30) by the stroke motor (21) via the transmission lever (22).
- Method according to claim 12 with reference to claim 6, characterized in that the fabric feed belt (13, 13a) interacts with a fabric feed belt (10, 11) designed for supporting the fabric from the other side, with the stroke being variably specified depending on an extra fabric width to be generated by means of the fabric feed belts (10, 13; 11, 13a).
- Method according to claim 12 or 13, characterized in that the stroke is specified depending on a given and measured thread tension or a speed of an arm shaft of the sewing machine (1).
- Method of operating a sewing machine, comprising- a machine head (3);- two pressure bars (18, 30) comprising-- in each case one fabric end, located near the fabric, where the pressure bar (18, 30) is connected to a pressure-applying device (14, 29) which is designed for interaction with the fabric;-- in each case one machine end, located near the machine head (3), where the pressure bar (18, 30) interacts with in each case one pressure-generating device (20, 31)
each of the pressure-generating device comprising:-- a servomotor (21);-- a transmission lever (22) which is mounted to a motor shaft (23) of the servomotor (21) in a torque-proof manner and which is in push connection at a radial distance from the motor shaft (23) with the machine end of the pressure bar (18, 30),wherein the pressure-applying device (14, 29), with which the at least one pressure bar (18, 30) interacts, interacts with a rotating fabric feed belt (13, 13 a),
characterized in that- the pressure, which is exerted on the fabric by the pressure bars (18, 30) varies during the formation of a stitch with respect to a set pressure curve exerted on the pressure bars (18, 30) by the servomotors (21) via the transmission levers (22); and- the stroke, which is exerted by the pressure bars (18, 30) during a stitch, varies with respect to a set stroke curve transmitted to the pressure bars (18, 30) by the servomotors (21) via the transmission levers (22);- with the pressure and stroke variation being specified depending on a straight or curved seam pattern to be specified by means of the fabric feed belts (10, 11; 13, 13a).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008030797A DE102008030797A1 (en) | 2008-06-28 | 2008-06-28 | Sewing machine and method for operating such a sewing machine |
Publications (2)
Publication Number | Publication Date |
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EP2138620A1 EP2138620A1 (en) | 2009-12-30 |
EP2138620B1 true EP2138620B1 (en) | 2012-05-16 |
Family
ID=41105232
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP20090007123 Active EP2138620B1 (en) | 2008-06-28 | 2009-05-28 | Sewing machine and method for operating same |
Country Status (5)
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EP (1) | EP2138620B1 (en) |
JP (1) | JP5286172B2 (en) |
KR (1) | KR101532097B1 (en) |
CN (1) | CN101613912B (en) |
DE (1) | DE102008030797A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014213457A1 (en) | 2014-07-10 | 2016-01-14 | Dürkopp Adler AG | Method for processing a sewing program for sewing sewing material and the sewing machine therefor |
Families Citing this family (10)
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CN102953244B (en) * | 2012-11-06 | 2015-06-17 | 贺欣机械厂股份有限公司 | Method and device for controlling synchronous operating of sewing equipment stitching and feeding motors |
CN103668798A (en) * | 2013-12-19 | 2014-03-26 | 吴江市菀坪宝得利缝制设备机械厂 | Vertical feeding mechanism of sewing machine |
CN105316876A (en) * | 2014-09-02 | 2016-02-10 | 保定泽泰服装机械制造有限公司 | A synchronous belt cloth feeding mechanism of a sewing machine |
CN105063899B (en) * | 2015-08-04 | 2018-01-30 | 江苏天淼软件开发有限公司 | A kind of cloth-rolling device on braid automatic sewing machine |
CN107488942B (en) * | 2016-06-10 | 2022-01-07 | Juki株式会社 | Flat-seam sewing machine |
CN105887348B (en) * | 2016-06-23 | 2018-07-31 | 钟治超 | A kind of sewing machine feeding mechanism |
DE102016011557A1 (en) * | 2016-09-26 | 2018-03-29 | Pfaff Industriesysteme Und Maschinen Gmbh | Sewing machine with a puller device |
CN107099940B (en) * | 2017-05-25 | 2020-03-06 | 杰克缝纫机股份有限公司 | Sewing machine |
CN107099941B (en) * | 2017-05-25 | 2020-04-17 | 杰克缝纫机股份有限公司 | Sewing machine |
CN111379083A (en) * | 2018-12-30 | 2020-07-07 | 浙江中捷缝纫科技有限公司 | Presser foot lifting device, sewing machine and control method of presser foot lifting device |
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JPH05192464A (en) * | 1992-01-20 | 1993-08-03 | Tokai Ind Sewing Mach Co Ltd | Fabric holder driving device of sewing machine |
JP2001198373A (en) * | 2000-01-20 | 2001-07-24 | Hirose Mfg Co Ltd | Feed mechanism in sewing machine |
DE10216810A1 (en) * | 2002-04-16 | 2003-11-06 | Duerkopp Adler Ag | Buttonhole sewing machine |
DE10233017B4 (en) * | 2002-07-20 | 2004-09-30 | Dürkopp Adler AG | Eye buttonhole sewing machine |
JP3903011B2 (en) * | 2003-01-23 | 2007-04-11 | 株式会社廣瀬製作所 | Leading roller |
JP4509491B2 (en) * | 2003-04-21 | 2010-07-21 | Juki株式会社 | Differential feed sewing machine |
JP2005192620A (en) * | 2003-12-26 | 2005-07-21 | Juki Corp | Cloth feeding mechanism of sewing machine |
DE102005049771A1 (en) * | 2005-10-18 | 2007-04-19 | Dürkopp Adler AG | Sewing machine comprises a presser foot position sensor, a material thickness sensor and a control unit for controlling the sewing machine in response to signals from the sensors |
DE102006042332A1 (en) | 2006-09-08 | 2008-03-27 | Dürkopp Adler AG | Sewing machine for sewing two pieces of sewing material while incorporating fullness |
DE102006042334A1 (en) | 2006-09-08 | 2008-03-27 | Dürkopp Adler AG | sewing machine |
DE102007026651A1 (en) * | 2007-06-08 | 2008-12-18 | Dürkopp Adler AG | Sewing machine and operating method for such a sewing machine |
JP2009089833A (en) * | 2007-10-05 | 2009-04-30 | Juki Corp | Cloth feeder of sewing machine |
-
2008
- 2008-06-28 DE DE102008030797A patent/DE102008030797A1/en not_active Withdrawn
-
2009
- 2009-05-28 EP EP20090007123 patent/EP2138620B1/en active Active
- 2009-06-24 JP JP2009149852A patent/JP5286172B2/en active Active
- 2009-06-24 KR KR1020090056429A patent/KR101532097B1/en active IP Right Grant
- 2009-06-26 CN CN200910149196XA patent/CN101613912B/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014213457A1 (en) | 2014-07-10 | 2016-01-14 | Dürkopp Adler AG | Method for processing a sewing program for sewing sewing material and the sewing machine therefor |
Also Published As
Publication number | Publication date |
---|---|
CN101613912A (en) | 2009-12-30 |
CN101613912B (en) | 2012-11-21 |
JP2010005403A (en) | 2010-01-14 |
EP2138620A1 (en) | 2009-12-30 |
KR20100002168A (en) | 2010-01-06 |
JP5286172B2 (en) | 2013-09-11 |
DE102008030797A1 (en) | 2009-12-31 |
KR101532097B1 (en) | 2015-06-26 |
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