EP2975169B1 - Sewing machine - Google Patents

Sewing machine Download PDF

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Publication number
EP2975169B1
EP2975169B1 EP15175573.3A EP15175573A EP2975169B1 EP 2975169 B1 EP2975169 B1 EP 2975169B1 EP 15175573 A EP15175573 A EP 15175573A EP 2975169 B1 EP2975169 B1 EP 2975169B1
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EP
European Patent Office
Prior art keywords
cam
sewing
sewing machine
drive
pressure
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EP15175573.3A
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German (de)
French (fr)
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EP2975169A1 (en
Inventor
Christoph Heckner
Gerd Langreck
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Duerkopp Adler AG
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Duerkopp Adler AG
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B29/00—Pressers; Presser feet
    • D05B29/02—Presser-control devices

Definitions

  • the invention relates to a sewing machine.
  • Such a sewing machine is known from the EP 2 105 526 B1 .
  • the CN 202658372 U discloses a presser foot fan assembly comprising a stepper motor that interacts with other components of the fan assembly via a cam.
  • the JP 07-231 991 A discloses a sewing machine with a presser foot drive.
  • Object of the present invention is to reduce the effort in the design of the pressure-adjusting device and the fan device.
  • a common drive for the pressure adjustment device on the one hand and for the fan device on the other hand leads to a significant simplification of the sewing machine construction.
  • a drive can be saved.
  • associated control components can be saved.
  • the common drive can be designed so that this does not affect the fundamentally independent functions "foot ventilation” and "pressure adjustment”. By saving the drive, the overall construction is cheaper and more compact.
  • a specification of a cam lever position "minimum hold-down pressure" according to claim 3 enables a defined specification of the minimum hold-down pressure.
  • a fan shaft according to claim 4 makes it possible to arrange the drive away from the sewing foot.
  • a stepping motor according to claim 5 allows in particular a gradation of the predetermined hold-down pressure. This can be used to adapt to the respective sewing environment. Even a fine gradation of a fan height is advantageous. When sewing thick fabrics, a high fan height can be preset. When sewing thinner fabrics, a lower fan height can be preset.
  • An adjustment range according to claim 6 enables a fine specification of the hold-down pressure without too great demands on a positioning accuracy or step division for the drive.
  • a sewing machine 1 has a stand 2, an arm 3 and a head 4, so that together with a base plate 5, a total C-shaped structure of the sewing machine 1 results.
  • a driven via a main drive not shown arm shaft drives a needle bar 6 with a sewing needle 7 fixed thereto up and down.
  • the needle 7 passes through a stitch hole in a throat plate, which forms part of a support plate, which in turn represents the top of the base plate 5 of the sewing machine 1.
  • the sewing machine 1 has a presser foot 9 for holding down sewing material during sewing, which is also referred to as a presser foot.
  • the presser foot 9 is mounted on a presser foot rod 10.
  • a hold-down pressure exerted by the presser foot 9 while holding down on the sewing material and for releasing the presser foot is an assembly that in the Fig. 2 generally designated by the reference numeral 11.
  • the assembly 11 comprises a pressure-adjusting device for setting the hold-down pressure, a fan device for releasing the presser foot and a common drive for these two devices.
  • the pressure adjusting device and the fan device will be explained in detail below.
  • the common drive is designed as a stepper motor 12.
  • a drive shaft of the stepper motor 12 is rotatably connected to a cam 13.
  • the cam 13 cooperates with a cam lever 14 on the one hand for releasing the presser foot 9 and on the other hand for driving the pressure-adjusting device.
  • the cam lever 14 is in turn rotatably connected to a fan shaft 15 which extends parallel to the arm shaft in the arm 3 of the sewing machine 1 and is rotatably mounted on a frame of the sewing machine 1.
  • Rotatably connected to the fan shaft 15 is a fan lever 16 which cooperates with a presser foot driver 17 which is fixedly connected to the presser foot rod 10.
  • the fan shaft 15 serves to transmit a shifting force from the cam lever 14 to the presser foot 9.
  • the fan shaft 15 is eccentrically connected to a fan shaft longitudinal axis hinged to a pull rod 18 which is used for pressing in the Fig. 2 Presser foot 9, not shown, presses from above over a sleeve 19 against the presser foot rod 10.
  • a compression spring 21 is arranged, which surrounds the presser foot rod 10 in sections helically.
  • the Fig. 1 and 2 show the assembly 11 in the drive position "minimum hold-down pressure".
  • a cam pin 22 of the cam lever 14 is engaged in a KurvenausEnglishung 23 of the cam 13, which defines the cam lever position "minimum hold-down pressure”.
  • the pull rod 18 exerts a minimum compressive force on the sleeve 19.
  • the compression spring 21 is minimally biased.
  • the force of the compression spring 21 is transmitted via the presser foot driver 17 to the presser foot rod 10, so that a corresponding, minimum hold-down pressure of the presser foot 9 during operation of the sewing machine 1 results.
  • "minimum hold-down pressure" of the fan lever 16 is disengaged from the presser foot driver 17th
  • Fig. 4 shows the drive position "Maximum foot lift". To reach this position, move from the position "Minimum Hold Down” to Fig. 3 the stepper motor 12 is operated so that its drive shaft by about 300 ° counterclockwise from the perspective of 3 and 4 is twisted.
  • the cam pin 22 has thereby run clockwise on the cam 13 to a curve portion 24 in which the cam 13 in turn acts as a lever on the cam pin 22.
  • the fan lever 16 presses the presser foot driver 17 against the pressure force of the compression spring 21 in the direction of the frame-fixed sleeve 20 upwards and takes the presser foot 10 for releasing the Presser foot 9 with.
  • the pull rod 18 is in an ineffective position.
  • Fig. 5 shows the drive position "maximum hold-down pressure".
  • the stepper motor 12 is switched so that its drive shaft, the cam 13 in comparison to the position after Fig. 3 has pivoted about 210 ° clockwise.
  • the cam pin 22 of the cam lever 14 runs counterclockwise on the cam 13 up to a curve area 25 "maximum hold-down pressure”.
  • the pull rod 18 is displaced downwardly due to its eccentric connection with the L predominantlywelle 15 and accordingly exerts a tensile force on the sleeve 19, which is pressed according to a maximum of the pull rod 18 down.
  • the compression spring 21 is biased to a maximum.
  • the cam 13 and the cam lever 14 thus act together so that in a rotational direction of a rotation of the cam airing of the presser foot 9 takes place and in an opposite direction of rotation, a drive of the pressure-adjusting device.
  • An adjustment range of the drive shaft of the stepping motor 12 between the cam lever position "minimum hold-down pressure" (see. Fig. 3 ) and the cam lever position “maximum hold-down pressure" (cf. Fig. 5 ) is more than 180 °.
  • the curve region 25 also serves as a stop for referencing the stepping motor 12.
  • the stepper motor 12 moves into the "maximum hold-down pressure” drive position until the cam bolt 22 bears against the stop formed by the curve region 25.
  • the curve area 25 designed as a stop does not require the use of further referencing sensors, which may otherwise be formed by a light barrier or an inductive switch.
  • the stepper motor 12 can be actuated, for example, via a pedal of the sewing machine 1 by an operator for foot lifting.
  • a default can be done via a control device 26, which in the Fig. 1 is shown schematically.
  • the controller 26 is in signal communication with the stepper motor 12 in a manner not shown.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Description

Die Erfindung betrifft eine Nähmaschine.The invention relates to a sewing machine.

Eine derartige Nähmaschine ist bekannt aus der EP 2 105 526 B1 . Die CN 202658372 U offenbart eine Nähfuß-Lüftereinrichtung, aufweisend einen Schrittmotor, der über eine Kurvenscheibe mit weiteren Komponenten der Lüftereinrichtung zusammenwirkt. Die JP 07-231 991 A offenbart eine Nähmaschine mit einem Drückerfußantrieb.Such a sewing machine is known from the EP 2 105 526 B1 , The CN 202658372 U discloses a presser foot fan assembly comprising a stepper motor that interacts with other components of the fan assembly via a cam. The JP 07-231 991 A discloses a sewing machine with a presser foot drive.

Aufgabe der vorliegenden Erfindung ist es, den Aufwand bei der Konstruktion der Andruck-Einstelleinrichtung und der Lüftereinrichtung zu reduzieren.Object of the present invention is to reduce the effort in the design of the pressure-adjusting device and the fan device.

Diese Aufgabe wird 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 ein gemeinsamer Antrieb für die Andruck-Einstelleinrichtung einerseits und für die Lüftereinrichtung andererseits zu einer deutlichen Vereinfachung der Nähmaschinenkonstruktion führt. Ein Antrieb kann eingespart werden. Auch zugehörige Steuerbauteile können eingespart werden. Der gemeinsame Antrieb kann so ausgeführt sein, dass dies nicht zu Beeinträchtigungen der grundsätzlich unabhängigen Funktionen "Fußlüften" und "Andruckeinstellung" führt. Durch das Sparen des Antriebs wird die Konstruktion insgesamt kostengünstiger und kompakter.According to the invention, it has been recognized that a common drive for the pressure adjustment device on the one hand and for the fan device on the other hand leads to a significant simplification of the sewing machine construction. A drive can be saved. Also associated control components can be saved. The common drive can be designed so that this does not affect the fundamentally independent functions "foot ventilation" and "pressure adjustment". By saving the drive, the overall construction is cheaper and more compact.

Ein Zusammenwirken von Kurvenscheibe und Kurvenhebel nach Anspruch 2 führt zu einer vorteilhaften Entkopplung mechanischer Übertragungselemente für das Fußlüften einerseits und für die Andruckeinstellung andererseits.An interaction of cam and cam lever according to claim 2 leads to an advantageous decoupling of mechanical transmission elements for foot ventilation on the one hand and for the Andruckeinstellung on the other.

Eine Vorgabe einer Kurvenhebelposition "Minimaler Niederhaltedruck" nach Anspruch 3 ermöglicht eine definierte Vorgabe des minimalen Niederhaltedrucks.A specification of a cam lever position "minimum hold-down pressure" according to claim 3 enables a defined specification of the minimum hold-down pressure.

Eine Lüfterwelle nach Anspruch 4 ermöglicht es, den Antrieb entfernt vom Nähfuß anzuordnen.A fan shaft according to claim 4 makes it possible to arrange the drive away from the sewing foot.

Ein Schrittmotor nach Anspruch 5 ermöglicht insbesondere eine Abstufung des vorzugebenden Niederhaltedrucks. Dies kann zur Anpassung an das jeweilige Nähumfeld genutzt werden. Auch eine feine Abstufung einer Lüfterhöhe ist vorteilhaft. Beim Vernähen dicker Stoffe kann eine hohe Lüfterhöhe voreingestellt werden. Beim Vernähen dünnerer Stoffe kann eine geringere Lüfterhöhe voreingestellt werden.A stepping motor according to claim 5 allows in particular a gradation of the predetermined hold-down pressure. This can be used to adapt to the respective sewing environment. Even a fine gradation of a fan height is advantageous. When sewing thick fabrics, a high fan height can be preset. When sewing thinner fabrics, a lower fan height can be preset.

Ein Verstellbereich nach Anspruch 6 ermöglicht eine feine Vorgabe des Niederhaltedrucks ohne zu große Anforderungen an eine Positionierungsgenauigkeit bzw. Schrittunterteilung für den Antrieb.An adjustment range according to claim 6 enables a fine specification of the hold-down pressure without too great demands on a positioning accuracy or step division for the drive.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der Zeichnung näher erläutert. In dieser zeigen:

Fig. 1
perspektivisch eine Nähmaschine in einer Vorderansicht;
Fig. 2
ebenfalls perspektivisch eine Baugruppe der Nähmaschine nach Fig. 1 mit einer Andruck-Einstelleinrichtung zur Vorgabe eines Niederhaltedrucks, den ein Nähfuß beim Niederhalten auf Nähgut ausübt, mit einer Lüftereinrichtung zum Lüften des Nähfußes und mit einem gemeinsamen Antrieb für diese Einrichtungen;
Fig. 3
eine Aufsicht auf die Baugruppe nach Fig. 2, gesehen aus Blickrichtung III, in einer Stellung "Minimaler Niederhaltedruck";
Fig. 4
in einer zu Fig. 3 ähnlichen Darstellung die Baugruppe in einer Position "Maximale Fußlüftung"; und
Fig. 5
in einer zu Fig. 3 ähnlichen Ansicht die Baugruppe in der Position "Maximaler Niederhaltedruck".
An embodiment of the invention will be explained in more detail with reference to the drawing. In this show:
Fig. 1
in perspective, a sewing machine in a front view;
Fig. 2
also in perspective an assembly of the sewing machine Fig. 1 with a pressure-adjusting device for specifying a hold-down pressure, which exerts a presser foot when holding down on sewing material, with a fan device for ventilation the presser foot and a common drive for these devices;
Fig. 3
a view of the assembly after Fig. 2 , seen from viewing direction III, in a position "minimal hold-down pressure";
Fig. 4
in one too Fig. 3 similar representation of the assembly in a position "maximum foot lift"; and
Fig. 5
in one too Fig. 3 similar view of the assembly in the position "maximum hold pressure".

Eine Nähmaschine 1 hat einen Ständer 2, einen Arm 3 sowie einen Kopf 4, so dass sich zusammen mit einer Grundplatte 5 ein insgesamt C-förmiger Aufbau der Nähmaschine 1 ergibt. Eine über einen nicht näher dargestellten Hauptantrieb angetriebene Armwelle treibt eine Nadelstange 6 mit einer hieran festgelegten Nähnadel 7 auf- und abgehend an. Die Nadel 7 durchtritt dabei ein Stichloch in einer Stichplatte, die Teil einer Auflageplatte bildet, die wiederum die Oberseite der Grundplatte 5 der Nähmaschine 1 darstellt.A sewing machine 1 has a stand 2, an arm 3 and a head 4, so that together with a base plate 5, a total C-shaped structure of the sewing machine 1 results. A driven via a main drive not shown arm shaft drives a needle bar 6 with a sewing needle 7 fixed thereto up and down. The needle 7 passes through a stitch hole in a throat plate, which forms part of a support plate, which in turn represents the top of the base plate 5 of the sewing machine 1.

Die Nähmaschine 1 hat zum Niederhalten von Nähgut während des Nähens einen Nähfuß 9, der auch als Drückerfuß bezeichnet ist. Der Nähfuß 9 ist an einer Drückerfußstange 10 montiert.The sewing machine 1 has a presser foot 9 for holding down sewing material during sewing, which is also referred to as a presser foot. The presser foot 9 is mounted on a presser foot rod 10.

Zur Vorgabe eines Niederhaltedrucks, den der Nähfuß 9 beim Niederhalten auf das Nähgut ausübt und zum Lüften des Nähfußes dient eine Baugruppe, die in der Fig. 2 insgesamt mit der Bezugsziffer 11 bezeichnet ist.To specify a hold-down pressure exerted by the presser foot 9 while holding down on the sewing material and for releasing the presser foot is an assembly that in the Fig. 2 generally designated by the reference numeral 11.

Die Baugruppe 11 umfasst eine Andruck-Anstelleinrichtung zur Vorgabe des Niederhaltedrucks, eine Lüftereinrichtung zum Lüften des Nähfußes sowie einen gemeinsamen Antrieb für diese beiden Einrichtungen. Die Andruck-Einstelleinrichtung und die Lüftereinrichtung werden nachfolgend noch im Detail erläutert. Der gemeinsame Antrieb ist als Schrittmotor 12 ausgeführt.The assembly 11 comprises a pressure-adjusting device for setting the hold-down pressure, a fan device for releasing the presser foot and a common drive for these two devices. The pressure adjusting device and the fan device will be explained in detail below. The common drive is designed as a stepper motor 12.

Eine Antriebswelle des Schrittmotors 12 ist drehfest mit einer Kurvenscheibe 13 verbunden. Die Kurvenscheibe 13 wirkt mit einem Kurvenhebel 14 einerseits zum Lüften des Nähfußes 9 und andererseits zum Antrieb der Andruck-Einstelleinrichtung zusammen. Der Kurvenhebel 14 ist wiederum drehfest mit einer Lüfterwelle 15 verbunden, die parallel zur Armwelle im Arm 3 der Nähmaschine 1 verläuft und drehbar an einem Rahmen der Nähmaschine 1 gelagert ist. Drehfest mit der Lüfterwelle 15 verbunden ist ein Lüfterhebel 16, der mit einem Drückerfuß-Mitnehmer 17 zusammenwirkt, der fest mit der Drückerfußstange 10 verbunden ist. Die Lüfterwelle 15 dient zur Übertragung einer Umstellkraft vom Kurvenhebel 14 auf den Nähfuß 9.A drive shaft of the stepper motor 12 is rotatably connected to a cam 13. The cam 13 cooperates with a cam lever 14 on the one hand for releasing the presser foot 9 and on the other hand for driving the pressure-adjusting device. The cam lever 14 is in turn rotatably connected to a fan shaft 15 which extends parallel to the arm shaft in the arm 3 of the sewing machine 1 and is rotatably mounted on a frame of the sewing machine 1. Rotatably connected to the fan shaft 15 is a fan lever 16 which cooperates with a presser foot driver 17 which is fixedly connected to the presser foot rod 10. The fan shaft 15 serves to transmit a shifting force from the cam lever 14 to the presser foot 9.

Am dem Kurvenhebel 14 gegenüberliegenden Ende ist die Lüfterwelle 15 exzentrisch zu einer Lüfterwelle-Längsachse gelenkig mit einer Zugstange 18 verbunden, die zum Andrücken des in der Fig. 2 nicht dargestellten Nähfußes 9 von oben her über eine Hülse 19 gegen die Drückerfußstange 10 drückt.At the opposite end of the cam lever 14, the fan shaft 15 is eccentrically connected to a fan shaft longitudinal axis hinged to a pull rod 18 which is used for pressing in the Fig. 2 Presser foot 9, not shown, presses from above over a sleeve 19 against the presser foot rod 10.

Zwischen einer weiteren, rahmenfesten Hülse 20, die von der Drückerfußstange 10 durchtreten wird, und dem Drückerfuß-Mitnehmer 17 ist eine Druckfeder 21 angeordnet, die die Drückerfußstange 10 abschnittsweise wendelförmig umgibt.Between a further, frame-fixed sleeve 20, which is penetrated by the presser foot rod 10, and the presser foot driver 17, a compression spring 21 is arranged, which surrounds the presser foot rod 10 in sections helically.

Die Fig. 1 und 2 zeigen die Baugruppe 11 in der Antriebsposition "Minimaler Niederhaltedruck". Ein Kurvenbolzen 22 des Kurvenhebels 14 ist in eine Kurvenausnehmung 23 der Kurvenscheibe 13 eingerückt, die die Kurvenhebelposition "Minimaler Niederhaltedruck" definiert. In der zugeordneten Schwenkposition der Lüfterwelle 15 übt die Zugstange 18 eine minimale Druckkraft auf die Hülse 19 aus. Die Druckfeder 21 ist minimal vorgespannt. Die Kraft der Druckfeder 21 wird über den Drückerfuß-Mitnehmer 17 auf die Drückerfußstange 10 übertragen, so dass ein entsprechender, minimaler Niederhaltedruck des Nähfußes 9 im Betrieb der Nähmaschine 1 resultiert. In dieser Antriebsposition "Minimaler Niederhaltedruck" ist der Lüfterhebel 16 außer Eingriff mit dem Drückerfuß-Mitnehmer 17.The Fig. 1 and 2 show the assembly 11 in the drive position "minimum hold-down pressure". A cam pin 22 of the cam lever 14 is engaged in a Kurvenausnehmung 23 of the cam 13, which defines the cam lever position "minimum hold-down pressure". In the associated pivot position of the fan shaft 15, the pull rod 18 exerts a minimum compressive force on the sleeve 19. The compression spring 21 is minimally biased. The force of the compression spring 21 is transmitted via the presser foot driver 17 to the presser foot rod 10, so that a corresponding, minimum hold-down pressure of the presser foot 9 during operation of the sewing machine 1 results. In this drive position "minimum hold-down pressure" of the fan lever 16 is disengaged from the presser foot driver 17th

Fig. 4 zeigt die Antriebsposition "Maximale Fußlüftung". Zum Erreichen dieser Position ist ausgehend von der Position "Minimaler Niederhaltedruck" nach Fig. 3 der Schrittmotor 12 so betrieben, dass dessen Antriebswelle um etwa 300° entgegen dem Uhrzeigersinn aus Sicht der Fig. 3 und 4 verdreht ist. Der Kurvenbolzen 22 ist hierdurch im Uhrzeigersinn an der Kurvenscheibe 13 bis zu einem Kurvenbereich 24 gelaufen, in dem die Kurvenscheibe 13 ihrerseits als Hebel auf dem Kurvenbolzen 22 wirkt. In dieser Position drückt der Lüfterhebel 16 den Drückerfuß-Mitnehmer 17 entgegen der Druckkraft der Druckfeder 21 in Richtung der rahmenfesten Hülse 20 nach oben und nimmt die Drückerfußstange 10 zum Lüften des Nähfußes 9 mit. Gleichzeitig ist die Zugstange 18 in einer wirkungslosen Stellung. Fig. 4 shows the drive position "Maximum foot lift". To reach this position, move from the position "Minimum Hold Down" to Fig. 3 the stepper motor 12 is operated so that its drive shaft by about 300 ° counterclockwise from the perspective of 3 and 4 is twisted. The cam pin 22 has thereby run clockwise on the cam 13 to a curve portion 24 in which the cam 13 in turn acts as a lever on the cam pin 22. In this position, the fan lever 16 presses the presser foot driver 17 against the pressure force of the compression spring 21 in the direction of the frame-fixed sleeve 20 upwards and takes the presser foot 10 for releasing the Presser foot 9 with. At the same time, the pull rod 18 is in an ineffective position.

Fig. 5 zeigt die Antriebsposition "Maximaler Niederhaltedruck". Im Vergleich zur Fig. 3 ist hierbei der Schrittmotor 12 so umgestellt, dass dessen Antriebswelle die Kurvenscheibe 13 im Vergleich zur Position nach Fig. 3 um etwa 210° im Uhrzeigersinn verschwenkt hat. Der Kurvenbolzen 22 des Kurvenhebels 14 läuft dabei entgegen dem Uhrzeigersinn an der Kurvenscheibe 13 bis zu einem Kurvenbereich 25 "Maximaler Niederhaltedruck". In dieser Stellung ist die Zugstange 18 aufgrund ihrer exzentrischen Verbindung mit der Lüftwelle 15 nach unten verlagert und übt entsprechend eine Zugkraft auf die Hülse 19 aus, die entsprechend maximal von der Zugstange 18 nach unten gedrückt wird. Dadurch wird die Druckfeder 21 maximal vorgespannt. Es resultiert der maximale Niederhaltedruck, den die Drückerfußstange 10 und damit der Nähfuß 9 im Betrieb der Nähmaschine 1 auf das Nähgut ausübt. In der Position "Maximaler Niederhaltedruck" ist der Lüfterhebel 16 wiederum außer Eingriff mit dem Drückerfuß-Mitnehmer 17. Fig. 5 shows the drive position "maximum hold-down pressure". In comparison to Fig. 3 In this case, the stepper motor 12 is switched so that its drive shaft, the cam 13 in comparison to the position after Fig. 3 has pivoted about 210 ° clockwise. The cam pin 22 of the cam lever 14 runs counterclockwise on the cam 13 up to a curve area 25 "maximum hold-down pressure". In this position, the pull rod 18 is displaced downwardly due to its eccentric connection with the Lüftwelle 15 and accordingly exerts a tensile force on the sleeve 19, which is pressed according to a maximum of the pull rod 18 down. As a result, the compression spring 21 is biased to a maximum. The result is the maximum hold-down pressure, which the presser foot rod 10 and thus the presser foot 9 exerts on the sewing material during operation of the sewing machine 1. In the position "maximum hold-down pressure", the fan lever 16 is again out of engagement with the presser foot driver 17.

Die Kurvenscheibe 13 und der Kurvenhebel 14 wirken also so zusammen, dass in einer Drehrichtung einer Drehung der Kurvenscheibe ein Lüften des Nähfußes 9 erfolgt und in einer entgegengesetzten Drehrichtung ein Antrieb der Andruck-Einstelleinrichtung.The cam 13 and the cam lever 14 thus act together so that in a rotational direction of a rotation of the cam airing of the presser foot 9 takes place and in an opposite direction of rotation, a drive of the pressure-adjusting device.

Ein Verstellbereich der Antriebswelle des Schrittmotors 12 zwischen der Kurvenhebelposition "Minimaler Niederhaltedruck" (vgl. Fig. 3) und der Kurvenhebelposition "Maximaler Niederhaltedruck" (vgl. Fig. 5) beträgt mehr als 180°.An adjustment range of the drive shaft of the stepping motor 12 between the cam lever position "minimum hold-down pressure" (see. Fig. 3 ) and the cam lever position "maximum hold-down pressure" (cf. Fig. 5 ) is more than 180 °.

Der Kurvenbereich 25 dient in der Stellung "maximaler Niederhaltedruck" zudem als Anschlag für ein Referenzieren des Schrittmotors 12. Hierzu fährt der Schrittmotor 12 in die Antriebsposition "maximaler Niederhaltedruck", bis der Kurvenbolzen 22 am durch den Kurvenbereich 25 gebildeten Anschlag anliegt. Der als Anschlag ausgeführte Kurvenbereich 25 erfordert keinen Einsatz weiterer Referenzierungs-Sensoren, die ansonsten durch eine Lichtschranke oder einen Induktivschalter gebildet sein können.In the "maximum hold-down pressure" position, the curve region 25 also serves as a stop for referencing the stepping motor 12. For this purpose, the stepper motor 12 moves into the "maximum hold-down pressure" drive position until the cam bolt 22 bears against the stop formed by the curve region 25. The curve area 25 designed as a stop does not require the use of further referencing sensors, which may otherwise be formed by a light barrier or an inductive switch.

Der Schrittmotor 12 kann beispielsweise über ein Pedal der Nähmaschine 1 von einer Bedienperson zum Fußlüften betätigt werden.The stepper motor 12 can be actuated, for example, via a pedal of the sewing machine 1 by an operator for foot lifting.

Zur Vorgabe des Niederhaltedrucks kann eine Voreinstellung über eine Steuereinrichtung 26 erfolgen, die in der Fig. 1 schematisch dargestellt ist. Die Steuereinrichtung 26 steht mit dem Schrittmotor 12 in nicht näher dargestellter Weise in Signalverbindung.To specify the hold-down pressure, a default can be done via a control device 26, which in the Fig. 1 is shown schematically. The controller 26 is in signal communication with the stepper motor 12 in a manner not shown.

Claims (6)

  1. Sewing machine (1)
    - with at least one sewing foot (9) for holding down material to be sewn during sewing,
    - with a pressure adjusting device for presetting a holding-down pressure, which the sewing foot (9) exerts on the material to be sewn when holding it down,
    - with a lifting device for lifting the sewing foot (9),
    characterised in that
    - a common drive (12) for the pressure adjusting device and for the lifting device is provided,
    - a cam disc (13), which cooperates with a cam lever (14), on the one hand, to lift the sewing foot (9) and, on the other hand, to drive the pressure adjusting device, is non-rotatably arranged on a drive shaft of the common drive (12).
  2. Sewing machine according to claim 1, characterised in that the cam disc (13) and the cam lever (14) cooperate in such a way that lifting of the sewing foot (9) takes place in one rotational direction of a rotation of the cam disc (13) and a drive of the pressure adjusting device takes place in an opposite rotational direction of the rotation of the cam disc (13).
  3. Sewing machine according to claim 1 or 2, characterised in that the cam disc (13) has a cam recess (23) for presetting a cam lever position "minimum holding-down pressure".
  4. Sewing machine according to any one of claims 1 to 3, characterised by a lifting shaft (15) for transmitting a switch operation force from the cam lever (13) to the sewing foot (9).
  5. Sewing machine according to any one of claims 1 to 4, characterised in that the drive (12) is formed by a stepping motor.
  6. Sewing machine according to any one of claims 1 to 5, characterised by an adjusting range of the drive shaft of the common drive (12) between a cam lever position "minimum holding-down pressure" and a cam lever position "maximum holding-down pressure" of more than 180°.
EP15175573.3A 2014-07-16 2015-07-07 Sewing machine Active EP2975169B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014213877.9A DE102014213877A1 (en) 2014-07-16 2014-07-16 sewing machine

Publications (2)

Publication Number Publication Date
EP2975169A1 EP2975169A1 (en) 2016-01-20
EP2975169B1 true EP2975169B1 (en) 2017-11-29

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EP15175573.3A Active EP2975169B1 (en) 2014-07-16 2015-07-07 Sewing machine

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JP (1) JP6518534B2 (en)
KR (1) KR20160009497A (en)
CN (1) CN105274739B (en)
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TW (1) TWI681091B (en)

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CN112226929B (en) * 2020-10-07 2022-11-11 浙江杜马缝纫机股份有限公司 Flush joint machine

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CN105274739B (en) 2019-07-19
KR20160009497A (en) 2016-01-26
TW201612377A (en) 2016-04-01
JP6518534B2 (en) 2019-05-22
JP2016022382A (en) 2016-02-08
CN105274739A (en) 2016-01-27
DE102014213877A1 (en) 2016-01-21
TWI681091B (en) 2020-01-01
EP2975169A1 (en) 2016-01-20

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