EP3556923B1 - Sewing machine - Google Patents
Sewing machine Download PDFInfo
- Publication number
- EP3556923B1 EP3556923B1 EP19165705.5A EP19165705A EP3556923B1 EP 3556923 B1 EP3556923 B1 EP 3556923B1 EP 19165705 A EP19165705 A EP 19165705A EP 3556923 B1 EP3556923 B1 EP 3556923B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cam
- sewing machine
- drive
- sewing
- lever
- 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.)
- Active
Links
- 238000009958 sewing Methods 0.000 title claims description 47
- 230000005540 biological transmission Effects 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 4
- 230000003993 interaction Effects 0.000 claims description 4
- 238000009423 ventilation Methods 0.000 description 15
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 241001433879 Camarea Species 0.000 description 6
- 238000010276 construction Methods 0.000 description 2
- 238000009420 retrofitting Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B29/00—Pressers; Presser feet
- D05B29/02—Presser-control devices
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B29/00—Pressers; Presser feet
- D05B29/06—Presser feet
- D05B29/08—Presser feet comprising relatively-movable parts
Definitions
- Such a sewing machine is known from the EP 2 975 169 B1 and the EP 2 105 526 B1 .
- the CN 202658372 U discloses a sewing foot fan device, comprising a stepper motor which interacts with other components of the fan device via a cam disk.
- the JP 07-231 991 A discloses a presser foot drive sewing machine.
- the EP 2 351 881 A1 discloses a multi-head embroidery machine with a gear for a presser of a presser unit.
- the US 2018/0016722 A1 discloses a sewing machine. From the DE-PS 292 059 a presser foot lifting device for sewing machines is known.
- the JP S56 31787 A discloses a presser foot assembly that cooperates with a cam having a plurality of cam sections.
- the object of the present invention is to increase the operational reliability of a common drive for a pressure setting device on the one hand and a fan device on the other hand.
- the scanning bodies can be components that are separate from the other cam lever and are firmly connected to it. Alternatively, the scanning bodies can be sections of the cam lever itself.
- the cam disc can have exactly one curve with which the two sensing elements interact. In this case, the two scanning bodies can interact with different curve sections of one and the same curve of the cam disk.
- a simultaneous interaction of the sensing element of the cam lever with the cam plate according to claim 2 can ensure a particularly secure frictional connection between the cam lever and the cam plate.
- "foot lifting" can take place in a drive area. There it can then be prevented that the cam lever undesirably loses its non-positive connection to the cam disc, for example when thick material is placed underneath, and an undefined state of the common drive can thus be avoided.
- An embodiment of a curve of the cam plate according to claim 3 leads to a particularly secure non-positive connection between the cam lever and the cam plate in a section of a total pivoting path of the cam plate.
- the two scanning bodies can encompass a region of the convex curve section. In this way, a positive locking contribution of a power transmission connection between the cam lever and the cam disc can be generated.
- the two scanning bodies can interact with the convex curve section in the manner of two intermeshing gear wheel sections.
- An embodiment of the scanning body according to claim 4 is inexpensive and reliable.
- cam disc and cam lever according to claim 5 leads to an advantageous decoupling of mechanical transmission elements for foot lifting on the one hand and for the pressure setting on the other.
- a specification of a cam lever position "minimum hold-down pressure" according to claim 6 enables a defined specification of the minimum hold-down pressure.
- a fan shaft according to claim 7 makes it possible to arrange the drive away from the presser foot. Seen in a plane perpendicular to the fan shaft, the scanning bodies can be arranged between the fan shaft and the drive shaft of the common drive. Such an arrangement can simplify curve design of the cam disk.
- a stepper motor according to claim 8 allows in particular a gradation of the hold-down pressure to be specified. This can be used to adapt to the respective sewing environment.
- a fine gradation of a fan height is also advantageous. When sewing thick fabrics, a high fan height can be preset. When sewing thinner fabrics, a lower fan height can be preset.
- An arrangement of the drive can be such that a drive shaft of the drive, in particular of the stepping motor, either towards the presser foot of the sewing machine or alternatively can be such that the drive shaft is oriented in the direction away from the presser foot.
- a drive which is compact in a critical dimension can hereby be realized.
- An adjustment range according to claim 9 enables a fine specification of the hold-down pressure without too great demands on a positioning accuracy or step division for the drive. Such a large adjustment range enables a drive with low torque and at the same time a slight slope of the curve of the cam disc.
- cam lever with two separate sensing elements and a cam plate shaped accordingly can also be used as a retrofit module.
- an already existing drive with a cam lever with exactly one scanning body can be replaced by a drive according to the invention with two scanning bodies, which leads to a correspondingly safe power transmission between the cam lever and the cam.
- a sewing machine 1 has a stand 2, an arm 3 and a head 4, so that together with a housing base plate 5 there is an overall C-shaped construction of the sewing machine 1.
- An arm shaft driven via a main drive (not shown in detail) drives a needle bar 6 with a sewing needle 7 fixed thereon up and down.
- the needle 7 passes through a stitch hole in a stitch plate, which forms part of a support plate 8, which in turn represents the top of the housing base plate 5 of the sewing machine 1.
- the sewing machine 1 has a presser foot 9, which is also referred to as a presser foot, for holding down sewing material during sewing.
- the presser foot 9 is mounted on a presser foot bar 10.
- an assembly is used in the Fig. 2 is generally designated with the reference number 11.
- the assembly 11 includes a pressure adjusting device for specifying the hold-down pressure, a fan device for lifting the presser foot and a common drive for these two devices.
- the pressure setting device and the fan device are explained in detail below.
- the common drive is designed as a stepper motor 12.
- a drive shaft 12a (see e.g. Fig. 3 ) of the stepping motor 12 is oriented away from the presser foot rod 10, so that a free end of the drive shaft 12a, that is in the opposite direction to the viewing direction III of the view of FIG Fig. 3 pointing to the viewer.
- the drive shaft of the stepper motor 12 is rotatably connected to a cam 13.
- the cam disc 13 interacts with a cam lever 14 on the one hand to lift the presser foot 9 and on the other hand to drive the pressure setting device.
- the cam lever 14 interacts with the cam plate 13 over an overall pivoting path of the cam plate 13.
- the cam lever 14 is in turn non-rotatably connected to a fan shaft 15 which runs 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.
- a fan lever 16, which cooperates with a presser foot driver 17, which is fixedly connected to the presser foot rod 10, is connected in a rotationally fixed manner to the fan shaft 15.
- the fan shaft 15 serves to transmit a changeover force from the cam lever 14 to the presser foot 9.
- the fan shaft 15 is connected in an articulated manner to a longitudinal axis of the fan shaft with a pull rod 18, which is used to press the in the Fig. 2 presser foot 9, not shown, presses from above via a sleeve 19 against the compression spring 21.
- Compression spring 21 is arranged, which partially surrounds the presser foot rod 10 in a helical shape.
- the 2 to 4 show the assembly 11 in the drive position "minimum hold-down pressure".
- a portion of a base plate of the cam lever 14 is omitted to further illustrate its interaction with the cam lever 14.
- a first scanning pin 22 of the cam lever 14, which represents a first scanning body of the cam lever 14, is inserted into a cam recess 23 of the cam disk 13, which defines the cam lever position "minimum hold-down pressure".
- the pull rod 18 exerts a minimal compressive force on the sleeve 19.
- the compression spring 21 is minimally biased.
- the force of the compression spring 21 is transmitted to the presser foot rod 10 via the presser foot driver 17, so that a corresponding, minimal hold-down pressure of the presser foot 9 results when the sewing machine 1 is in operation.
- this "minimum hold-down pressure" drive position the fan lever 16 is out of engagement with the presser foot driver 17.
- the 5 and 6 show the drive position "Maximum foot ventilation".
- the stepper motor 12 operated so that its drive shaft by about 80 ° counterclockwise from the perspective of 3 to 6 is twisted.
- a second scanning pin 24 of the cam lever 14, which represents a second scanning body of the cam lever 14, has run clockwise on the cam 13 to a cam area 25 in which the cam 13 in turn acts as a lever on the second scanning pin 24.
- the fan lever 16 presses the Presser foot driver 17 against the compressive force of the compression spring 21 in the direction of the frame-fixed sleeve 20 upwards and takes the presser foot rod 10 for lifting the presser foot 9.
- the two scanning pins 22, 24 of the cam lever 14 are arranged separately from one another.
- the two scanning bolts 22, 24 are firmly connected to the cam lever 14.
- the two scanning bolts 22, 24 are arranged such that they interact with the cam plate 13 in each case at least in a section of the total pivoting path of the cam plate 13.
- the first scanning pin 22 interacts with the cam plate 13 in the region of the curve recess 23.
- the second scanning pin 24 interacts with the cam area 25.
- the curve recess 23 on the one hand and the curve area 25 on the other hand represent two concave curve sections of the cam disk 13. Between these two concave curve sections 23, 25, the cam disk 13 has a convex curve section 26 which is designed in the form of a nose of the curve line of the cam disk 13.
- the 7 and 8 show the drive position "medium foot ventilation height” between the two drive positions described above “minimum hold-down pressure” and “maximum foot ventilation”.
- this drive position "average foot ventilation height”
- the convex cam section 26 engages between the two scanning bolts 22, 24 and thus secures the contact of the cam lever 14 on the cam disc via a positive locking contribution 13.
- the presser foot 9 and the presser foot rod 10 its contact position on the cam disk 13 remains secured.
- the cam disk 13 and the cam lever 14 thus cooperate in such a way that the sewing foot 9 is released in one direction of rotation of the cam disk and the pressure setting device is driven in an opposite direction of rotation.
- An adjustment range of the drive shaft of the stepper motor 12 between the cam lever position “minimum hold-down pressure” (cf. Fig. 3 ) and the cam lever position “maximum hold-down pressure” (cf. Fig. 9 ) is more than 180 °.
- the stepper motor 12 can be operated by an operator for foot lifting, for example, via a pedal of the sewing machine 1.
- a presetting can be made via a control device 26, which in the Fig. 1 is shown schematically.
- the control device 26 is in signal connection with the stepper motor 12 in a manner not shown in detail.
- a further embodiment of an assembly 28 for specifying a hold-down pressure and for releasing a presser foot is explained below, which can be used in the sewing machine 1 instead of the assembly 11 explained above.
- Components and functions which correspond to those which have already been explained above with reference to the assembly 11 have the same reference numerals and will not be discussed again in detail.
- the stepper motor 12 is arranged such that its drive shaft in the direction of the presser foot rod 10, that is again in the opposite direction to the viewpoint XII of the viewer of the Fig. 12 to, is oriented.
- the orientation of the drive shaft of the stepping motor 12 in relation to the push rod 10 is therefore opposite to the assembly 11 in the assembly 28.
- Fig. 11 and 12th show the drive position "minimum hold-down pressure".
- the first scanning pin 22 of the cam lever 14 comes into contact with the cam disk 13 in the cam recess 23.
- the Fig. 13 shows the drive position "Maximum foot ventilation”.
- the stepper motor 12 of the assembly 28 is operated in such a way that the cam disk 13, which is firmly connected to the drive shaft thereof, is rotated counterclockwise by approximately 180 ° from the perspective of FIG 12 and 13 , based on the drive position "minimum hold-down pressure" Fig. 12 , is twisted.
- the second scanning pin 24 plunges into a further concave curve area 25 of the cam plate 13, which corresponds to the curve area 25 of the assembly 11.
- This pivoting of the cam disc 13 causes the cam lever 14 to be pivoted counterclockwise by approximately 45 °, starting from the "minimum foot pressure” drive position.
- the fan lever 16 in turn presses the presser foot driver 17 against the pressure force of the compression spring 21 in the direction of the frame-fixed sleeve 20, as described above in connection with FIGS 5 and 6 to assembly 11 already explained.
- the Fig. 14 shows the drive position "middle foot ventilation", ie an intermediate drive position between the positions “minimum foot pressure” Fig. 12 and “Maximum foot ventilation” Fig. 13 .
- this drive position "average foot lifting height”
- the two drive bolts 22, 24 act simultaneously with the convex curve section 26 of the cam disk 13.
- Fig. 15 again shows the drive position "maximum hold-down pressure".
- the cam disk 13 of the assembly 28 is pivoted clockwise by approximately 210 °, which in turn takes place via the stepper motor 12.
- the first scanning pin 22 runs on the cam disk 13 of the assembly 28 up to the cam area 27 "maximum hold-down pressure”.
- the cam lever 14 is in this drive position "maximum hold-down pressure” compared to the drive position "minimum foot pressure" in the view according to the Fig. 12 and 15 pivoted about 90 ° clockwise.
- the cam area 27 also serves as a stop for referencing the stepper motor 12.
- the stepper motor 12 moves into the "maximum hold-down pressure" drive position until the first scanning pin 22 abuts the stop formed by the cam area 27.
- the curve region 27 designed as a stop does not require the use of further referencing sensors, which can otherwise be formed by a light barrier or an inductive switch.
- assembly 11 for example, "minimum hold-down pressure" (cf. 3 to 4 ) the two scanning pins 22 and 24 in the supervision according to the 3 and 4 seen between the fan shaft 15 and the drive shaft 12a of the stepping motor 12.
- assembly 28 for example, "maximum foot ventilation” is in the drive position (cf. Fig. 13 ) the two tracing pins 22, 24, as seen from above Fig. 13 , approximately at the level of the drive shaft 12a of the stepping motor 12.
- the 16 and 17 show the cam 13 in perspective ( Fig. 16 ) and the cam lever ( Fig. 17 ) of assembly 28.
- the cam disc 13 and the cam lever 14 of the assembly 28 can be used as a retrofitting assembly for retrofitting an existing drive assembly, the fan lever of this existing drive assembly originally having exactly one scanning pin.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Description
Eine derartige Nähmaschine ist bekannt aus der
Aufgabe der vorliegenden Erfindung ist es, die Betriebssicherheit eines gemeinsamen Antriebs für eine Andruck-Einstelleinrichtung einerseits und eine Lüftereinrichtung andererseits zu erhöhen.The object of the present invention is to increase the operational reliability of a common drive for a pressure setting device on the one hand and a fan device on the other hand.
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
Ein aus der
Ein gleichzeitiges Zusammenwirken der Abtastkörper des Kurvenhebels mit der Kurvenscheibe nach Anspruch 2 kann einen besonders sicheren Kraftschluss zwischen dem Kurvenhebel und der Kurvenscheibe gewährleisten. Bei dem Abschnitt des Gesamt-Verschwenkweges der Kurvenscheibe, in dem die zwei Abtastkörper gleichzeitig mit der Kurvenscheibe zusammenwirken, kann in einem Antriebsbereich "Fußlüften" erfolgen. Dort kann dann verhindert werden, dass der Kurvenhebel beispielsweise beim Unterlegen von dickem Nähgut unerwünscht seine kraftschlüssige Verbindung mit der Kurvenscheibe verliert und somit kann ein undefinierter Zustand des gemeinsamen Antriebs vermieden werden.A simultaneous interaction of the sensing element of the cam lever with the cam plate according to
Eine Ausgestaltung einer Kurve der Kurvenscheibe nach Anspruch 3 führt zu einer besonders sicheren kraftschlüssigen Verbindung zwischen dem Kurvenhebel und der Kurvenscheibe in einem Abschnitt eines Gesamt-Verschwenkweges der Kurvenscheibe. Die beiden Abtastkörper können bei einer derartigen Ausgestaltung einen Bereich des konvexen Kurvenabschnitts umgreifen. Hierdurch kann ein Formschlussbeitrag einer Kraftübertragungsverbindung zwischen dem Kurvenhebel und der Kurvenscheibe erzeugt werden. Die beiden Abtastkörper können mit dem konvexen Kurvenabschnitt nach Art zweier ineinandergreifender Zahnrad-Abschnitte zusammenwirken.An embodiment of a curve of the cam plate according to
Eine Ausgestaltung der Abtastkörper nach Anspruch 4 ist kostengünstig und betriebssicher.An embodiment of the scanning body according to claim 4 is inexpensive and reliable.
Ein Zusammenwirken von Kurvenscheibe und Kurvenhebel nach Anspruch 5 führt zu einer vorteilhaften Entkopplung mechanischer Übertragungselemente für das Fußlüften einerseits und für die Andruckeinstellung andererseits.An interaction of the cam disc and cam lever according to
Eine Vorgabe einer Kurvenhebelposition "Minimaler Niederhaltedruck" nach Anspruch 6 ermöglicht eine definierte Vorgabe des minimalen Niederhaltedrucks.A specification of a cam lever position "minimum hold-down pressure" according to
Eine Lüfterwelle nach Anspruch 7 ermöglicht es, den Antrieb entfernt vom Nähfuß anzuordnen. Gesehen in einer Ebene senkrecht zur Lüfterwelle können die Abtastkörper zwischen der Lüfterwelle und der Antriebswelle des gemeinsamen Antriebs angeordnet sein. Eine solche Anordnung kann eine Kurvengestaltung der Kurvenscheibe vereinfachen.A fan shaft according to
Ein Schrittmotor nach Anspruch 8 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 stepper motor according to claim 8 allows in particular a gradation of the hold-down pressure to be specified. This can be used to adapt to the respective sewing environment. A fine gradation of a fan height is also advantageous. When sewing thick fabrics, a high fan height can be preset. When sewing thinner fabrics, a lower fan height can be preset.
Eine Anordnung des Antriebs kann so sein, dass eine Antriebswelle des Antriebs, insbesondere des Schrittmotors, entweder in Richtung auf den Nähfuß der Nähmaschine zu oder kann alternativ so sein, dass die Antriebswelle in Richtung vom Nähfuß weg orientiert ist. Je nach den Bauraumerfordernissen für den Antrieb in Quer- oder Längsrichtung beispielsweise eines Nähmaschinenarms kann hierdurch ein in einer kritischen Dimension kompakter Antrieb realisiert werden.An arrangement of the drive can be such that a drive shaft of the drive, in particular of the stepping motor, either towards the presser foot of the sewing machine or alternatively can be such that the drive shaft is oriented in the direction away from the presser foot. Depending on the installation space requirements for the drive in the transverse or longitudinal direction, for example of a sewing machine arm, a drive which is compact in a critical dimension can hereby be realized.
Ein Verstellbereich nach Anspruch 9 ermöglicht eine feine Vorgabe des Niederhaltedrucks ohne zu große Anforderungen an eine Positionierungsgenauigkeit bzw. Schrittunterteilung für den Antrieb. Ein derart großer Verstellbereich ermöglicht einen drehmomentschwachen Antrieb bei gleichzeitig geringer Steigung der Kurve der Kurvenscheibe.An adjustment range according to
Es wurde zudem erkannt, dass ein Kurvenhebel mit zwei voneinander separat angeordneten Abtastkörpern und eine entsprechend hierzu geformte Kurvenscheibe auch als Umrüst-Baugruppe genutzt werden können. Hierdurch kann ein bereits existierender Antrieb mit einem Kurvenhebel mit genau einem Abtastkörper durch einen erfindungsgemäßen Antrieb mit zwei Abtastkörpern ersetzt werden, was zu einer entsprechend sicheren Kraftübertragung zwischen dem Kurvenhebel und der Kurvenscheibe führt.It was also recognized that a cam lever with two separate sensing elements and a cam plate shaped accordingly can also be used as a retrofit module. In this way, an already existing drive with a cam lever with exactly one scanning body can be replaced by a drive according to the invention with two scanning bodies, which leads to a correspondingly safe power transmission between the cam lever and the cam.
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
- die Ansicht nach
Fig. 3 , wobei ein Abschnitt einer Grundplatte eines Kurvenhebels des Antriebs weggelassen ist; - Fig. 5
- in einer zu
Fig. 3 ähnlichen Darstellung die Baugruppe in einer Position "Maximale Fußlüftung"; - Fig. 6
- die Baugruppe nach
Fig. 5 , wiederum mit abschnittsweise weggelassener Grundplatte des Kurvenhebels; - Fig. 7
- in einer zu
Fig. 3 ähnlichen Darstellung die Baugruppe in einer Position "Mittlere Fußlüftungshöhe"; - Fig. 8
- die Baugruppe nach
Fig. 7 , wiederum mit abschnittsweise weggelassener Grundplatte des Kurvenhebels; - Fig. 9
- in einer zu
Fig. 3 ähnlichen Darstellung die Baugruppe in einer Position "Maximaler Niederhaltedruck"; - Fig. 10
- die Baugruppe nach
Fig. 9 , wiederum mit abschnittsweise weggelassener Grundplatte des Kurvenhebels; - Fig. 11
- in einer zu
Fig. 2 ähnlichen Darstellung eine weitere Ausführung einer Baugruppe 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, wobei die Baugruppe nachFig. 11 anstelle der Baugruppe nachFig. 2 zum Einsatz kommen kann; - Fig. 12
- eine Aufsicht auf die Baugruppe nach
Fig. 11 , gesehen aus Blickrichtung XII, in einer Stellung "Minimaler Niederhaltedruck", wobei ähnlich wie in derFig. 4 ein Abschnitt einer Grundplatte eines Kurvenhebels des Antriebs weggelassen ist; - Fig. 13
- in einer zu
Fig. 12 ähnlichen Darstellung die Baugruppe in einer Position "Maximale Fußlüftung"; - Fig. 14
- in einer zu
Fig. 12 ähnlichen Ansicht die Baugruppe in der Position "Mittlere Fußlüftungshöhe"; - Fig. 15
- in einer zu
Fig. 12 ähnlichen Ansicht die Baugruppe in der Position "Maximaler Niederhaltedruck"; - Fig. 16
- perspektivisch eine Kurvenscheibe der Baugruppe nach
Fig. 11 ; und - Fig. 17
- perspektivisch den Kurvenhebel der Baugruppe nach
Fig. 11 .
- Fig. 1
- perspective a sewing machine in a front view;
- Fig. 2
- also a perspective of an assembly of the sewing machine
Fig. 1 with a pressure setting device for specifying a hold-down pressure which a presser foot exerts on the material when holding it down, with a fan device for lifting the presser foot and with a common drive for these devices; - Fig. 3
- supervision of the assembly
Fig. 2 , seen from viewing direction III, in a position "minimum hold-down pressure"; - Fig. 4
- the view after
Fig. 3 , wherein a portion of a base plate of a cam lever of the drive is omitted; - Fig. 5
- in one too
Fig. 3 similar representation the assembly in a position "maximum foot ventilation"; - Fig. 6
- the assembly after
Fig. 5 , again with the base plate of the cam lever omitted in sections; - Fig. 7
- in one too
Fig. 3 similar representation the assembly in a position "medium foot ventilation height"; - Fig. 8
- the assembly after
Fig. 7 , again with the base plate of the cam lever omitted in sections; - Fig. 9
- in one too
Fig. 3 similar representation the assembly in a position "maximum hold-down pressure"; - Fig. 10
- the assembly after
Fig. 9 , again with the base plate of the cam lever omitted in sections; - Fig. 11
- in one too
Fig. 2 Similar representation another embodiment of an assembly with a pressure setting device for specifying a hold-down pressure that a presser foot exerts on the material when holding it down, with a fan device for lifting the presser foot and with a common drive for these devices, the assembly according toFig. 11 instead of the assemblyFig. 2 can be used; - Fig. 12
- supervision of the assembly
Fig. 11 , seen from viewing direction XII, in a position "minimum hold-down pressure", similar to that in theFig. 4 a portion of a base plate of a cam lever of the drive is omitted; - Fig. 13
- in one too
Fig. 12 similar representation the assembly in a position "maximum foot ventilation"; - Fig. 14
- in one too
Fig. 12 similar view the assembly in the position "medium foot ventilation height"; - Fig. 15
- in one too
Fig. 12 similar view the assembly in the position "maximum hold-down pressure"; - Fig. 16
- in perspective a cam of the assembly
Fig. 11 ; and - Fig. 17
- perspective the cam lever of the assembly
Fig. 11 .
Eine Nähmaschine 1 hat einen Ständer 2, einen Arm 3 sowie einen Kopf 4, so dass sich zusammen mit einer Gehäuse-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 8 bildet, die wiederum die Oberseite der Gehäuse-Grundplatte 5 der Nähmaschine 1 darstellt.A
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
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
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. Eine Antriebswelle 12a (vgl. z. B.
Die 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 wirkt mit der Kurvenscheibe 13 über einen Gesamt-Verschwenkweg der Kurvenscheibe 13 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.The drive shaft of the
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
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 another, frame-fixed
Die
Ein erster Abtastbolzen 22 des Kurvenhebels 14, der einen ersten Abtastkörper des Kurvenhebels 14 darstellt, 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.A
Die
Die beiden Abtastbolzen 22, 24 des Kurvenhebels 14 sind voneinander separat angeordnet. Die beiden Abtastbolzen 22, 24 sind mit dem Kurvenhebel 14 fest verbunden.The two
Die beiden Abtastbolzen 22, 24 sind so angeordnet, dass sie mit der Kurvenscheibe 13 jeweils zumindest in einem Abschnitt des Gesamt-Verschwenkweges der Kurvenscheibe 13 zusammenwirken. Im Verschwenkweg-Bereich der Kurvenhebelposition "Minimaler Niederhaltedruck" (vgl. die
Die Kurvenausnehmung 23 einerseits und der Kurvenbereich 25 andererseits stellen zwei konkave Kurvenabschnitte der Kurvenscheibe 13 dar. Zwischen diesen beiden konkaven Kurvenabschnitten 23, 25 weist die Kurvenscheibe 13 einen konvexen Kurvenabschnitt 26 auf, der in Form einer Nase der Kurvenlinie der Kurvenscheibe 13 ausgebildet ist.The
Die
In einem Abschnitt des Bereichs zwischen der Antriebsposition "Minimaler Niederhaltedruck" (vgl. beispielsweise die
In dieser Stellung ist die Zugstange 18 aufgrund ihrer exzentrischen Verbindung mit der Lüfterwelle 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. Der Kurvenhebel 14 wird hierdurch im Vergleich zur Antriebsposition "Minimaler Niederhaltedruck" nach
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
Ein Verstellbereich der Antriebswelle des Schrittmotors 12 zwischen der Kurvenhebelposition "Minimaler Niederhaltedruck" (vgl.
Der Schrittmotor 12 kann beispielsweise über ein Pedal der Nähmaschine 1 von einer Bedienperson zum Fußlüften betätigt werden.The
Zur Vorgabe des Niederhaltedrucks kann eine Voreinstellung über eine Steuereinrichtung 26 erfolgen, die in der
Anhand der
Bei der Baugruppe 28 ist der Schrittmotor 12 so angeordnet, dass dessen Antriebswelle in Richtung auf die Drückerfußstange 10 zu, also wiederum in Gegenrichtung der Blickrichtung XII auf den Betrachter der
Die
Die
Die
Zwischen den beiden konkaven Kurvenbereichen 23 und 25 der Kurvenscheibe 13 der Baugruppe 28 liegt wiederum ein konvexer Kurvenabschnitt 26, der bei der Kurvenscheibe 13 der Baugruppe 28 voluminöser geformt ist als bei der Kurvenscheibe 13 der Baugruppe 11.Between the two
In dieser Stellung ist die Zugstange 18 aufgrund ihrer exzentrischen Verbindung mit der Lüfterwelle 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. Der zweite Abtastbolzen 24 ist in dieser Position "Maximaler Niederhaltedruck" außer Eingriff mit der Kurvenscheibe 13.In this position, the
Der Kurvenbereich 27 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 erste Abtastbolzen 22 am durch den Kurvenbereich 27 gebildeten Anschlag anliegt. Der als Anschlag ausgeführte Kurvenbereich 27 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
Bei der Baugruppe 11 sind beispielsweise in der Antriebsposition "Minimaler Niederhaltedruck" (vgl. die
Die
Die Kurvenscheibe 13 und der Kurvenhebel 14 der Baugruppe 28 können als Umrüst-Baugruppe zum Umrüsten einer existierenden Antriebs-Baugruppe genutzt werden, wobei der Lüfterhebel dieser existierenden Antriebs-Baugruppe ursprünglich genau einen Abtastbolzen aufweist.The
Claims (9)
- Sewing machine (1)- with at least one sewing foot (9) for holding down a piece of fabric during sewing,- with a pressure adjusting device for setting a hold-down pressure, exerted by the sewing foot (9) when holding down the piece of fabric,- with a lifting device for lifting the sewing foot,- with a common drive (12) for the pressure adjusting device and for the lifting device,- wherein a cam disc (13), which interacts 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), wherein the cam lever (14) is configured in such a way as to interact with the cam disc (13) along a total pivoting path of the cam disc (13),
characterized in that- the cam lever (14) has two cam followers (22, 24) arranged separately from one another, the cam followers (22, 24) being arranged so as to interact with the cam disc (13) in each case at least in a section of the total pivoting path of the cam disc (13). - Sewing machine as claimed in claim 1, characterized in that the two cam followers (22, 24) are arranged so as to simultaneously interact with the cam disc (13) at least in a section of the total pivoting path of the cam disc (13).
- Sewing machine as claimed in claim 2, characterized in that a cam of the cam disc (13) has a convex cam section (26) adjoined by a respective concave cam section (23, 25) on either side of the convex cam section (26), wherein the convex cam section (26) is the one via which a simultaneous interaction of the two cam followers (22, 24) with the cam disc (13) takes place.
- Sewing machine as claimed in any one of claims 1 to 3, characterized in that the two cam followers (22, 24) are configured as followers, which are rigidly connected to the cam lever (14).
- Sewing machine as claimed in any one of claims 1 to 4, characterized in that the cam disc (13) and the cam lever (14) interact in such a way that a lifting of the sewing foot (9) takes place in one rotational direction of a rotation of the cam while a driving of the pressure adjusting device takes place in a rotational direction counter thereto.
- Sewing machine as claimed in any one of claims 1 to 5, characterized in that the cam disc (13) has a cam recess (23) configuring a concave cam section of the cam disc (13) for setting a "minimum hold-down pressure" cam lever position.
- Sewing machine as claimed in any one of claims 1 to 6, characterized by a lifting shaft (15) for the transmission of a switch operation force from the cam lever (14) to the sewing foot (9).
- Sewing machine as claimed in any one of claims 1 to 7, characterized in that the drive (12) is configured as a stepper motor (12).
- Sewing machine as claimed in any one of claims 1 to 8, characterized by an adjusting range of the drive shaft of the common drive (12) between a "minimum hold-down pressure" cam lever position and a "maximum hold-down pressure" cam lever position of more than 180°.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018206088.6A DE102018206088A1 (en) | 2018-04-20 | 2018-04-20 | sewing machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3556923A1 EP3556923A1 (en) | 2019-10-23 |
EP3556923B1 true EP3556923B1 (en) | 2020-08-05 |
Family
ID=65995639
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19165705.5A Active EP3556923B1 (en) | 2018-04-20 | 2019-03-28 | Sewing machine |
Country Status (6)
Country | Link |
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EP (1) | EP3556923B1 (en) |
JP (1) | JP6821738B2 (en) |
KR (1) | KR102632181B1 (en) |
CN (1) | CN110387643B (en) |
DE (1) | DE102018206088A1 (en) |
TW (1) | TWI828678B (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CN110878450B (en) * | 2019-12-23 | 2021-11-02 | 杰克缝纫机股份有限公司 | Sewing machine trimming lifting presser foot and presser foot pressure adjusting device and sewing machine |
CN112391746A (en) * | 2020-10-30 | 2021-02-23 | 浙江广和缝纫机有限公司 | Presser foot lifting and trimming device of overedger |
CN114763636B (en) * | 2021-01-13 | 2023-06-20 | 杰克科技股份有限公司 | Joint debugging mechanism and sewing machine |
CN115074923B (en) * | 2021-03-16 | 2023-06-06 | 杰克科技股份有限公司 | Sewing machine |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE292059C (en) * | ||||
JPS5822236B2 (en) * | 1979-08-22 | 1983-05-07 | リッカ−株式会社 | sewing machine presser foot mechanism |
JP3079246B2 (en) | 1995-07-13 | 2000-08-21 | 太平洋セメント株式会社 | Slope green retaining wall |
JP2002159769A (en) * | 2000-11-24 | 2002-06-04 | Janome Sewing Mach Co Ltd | Sewing machine provided with presser bar pressure regulator and sewing machine provided with presser bar lifter |
JP2006102400A (en) * | 2004-10-08 | 2006-04-20 | Juki Corp | Sewing machine |
DE102007052876A1 (en) * | 2007-11-07 | 2009-05-20 | Dürkopp Adler AG | sewing machine |
DE102008016353A1 (en) * | 2008-03-29 | 2009-10-08 | Dürkopp Adler AG | sewing machine |
CH702470A1 (en) * | 2009-12-18 | 2011-06-30 | Laesser Ag | Embroidery machine, in particular, multi-head multi-needle embroidery machine. |
CN202658372U (en) | 2012-05-04 | 2013-01-09 | 东莞市顺机机械科技有限公司 | Middle presser foot lifting mechanism for sewing machine |
DE102014213877A1 (en) * | 2014-07-16 | 2016-01-21 | Dürkopp Adler AG | sewing machine |
JP6606929B2 (en) * | 2015-09-04 | 2019-11-20 | ブラザー工業株式会社 | sewing machine |
JP6603525B2 (en) * | 2015-09-18 | 2019-11-06 | Juki株式会社 | sewing machine |
CN206127610U (en) * | 2016-09-27 | 2017-04-26 | 台州市速普机电有限公司 | Integrative drive structure of presser foot is lifted to sewing machine trimming |
CN208293220U (en) * | 2018-02-08 | 2018-12-28 | 广州昊辰皮具有限公司 | A kind of computer car with presser feet automatic lifting mechanism |
-
2018
- 2018-04-20 DE DE102018206088.6A patent/DE102018206088A1/en not_active Withdrawn
-
2019
- 2019-03-28 EP EP19165705.5A patent/EP3556923B1/en active Active
- 2019-04-16 KR KR1020190044255A patent/KR102632181B1/en active IP Right Grant
- 2019-04-18 JP JP2019079189A patent/JP6821738B2/en active Active
- 2019-04-18 CN CN201910312803.3A patent/CN110387643B/en active Active
- 2019-04-19 TW TW108113749A patent/TWI828678B/en active
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
DE102018206088A1 (en) | 2019-10-24 |
CN110387643B (en) | 2021-11-16 |
KR102632181B1 (en) | 2024-01-31 |
KR20190122565A (en) | 2019-10-30 |
EP3556923A1 (en) | 2019-10-23 |
JP2019188142A (en) | 2019-10-31 |
JP6821738B2 (en) | 2021-01-27 |
TW201943909A (en) | 2019-11-16 |
TWI828678B (en) | 2024-01-11 |
CN110387643A (en) | 2019-10-29 |
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