EP1897984B1 - Sewing machine - Google Patents

Sewing machine Download PDF

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Publication number
EP1897984B1
EP1897984B1 EP07013634.6A EP07013634A EP1897984B1 EP 1897984 B1 EP1897984 B1 EP 1897984B1 EP 07013634 A EP07013634 A EP 07013634A EP 1897984 B1 EP1897984 B1 EP 1897984B1
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EP
European Patent Office
Prior art keywords
sewing machine
feeder
fabric
machine according
conveyor belt
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EP07013634.6A
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German (de)
French (fr)
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EP1897984A2 (en
EP1897984A3 (en
Inventor
Johann Enns
Jan-Peter Geisler
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Duerkopp Adler AG
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Duerkopp Adler AG
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Publication of EP1897984A2 publication Critical patent/EP1897984A2/en
Publication of EP1897984A3 publication Critical patent/EP1897984A3/en
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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/10—Work-feeding means with rotary circular feed members
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/10—Work-feeding means with rotary circular feed members
    • D05B27/12—Work-feeding means with rotary circular feed members rotating continuously
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/10—Work-feeding means with rotary circular feed members
    • D05B27/16—Work-feeding means with rotary circular feed members with differential feed motions
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/24—Feed-dog lifting and lowering devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B73/00—Casings
    • D05B73/04—Lower casings
    • D05B73/08—Lower casings for column-type sewing machines

Definitions

  • the invention relates to a sewing machine according to the preamble of claim 1.
  • Such a sewing machine is known from the DE 10 2004 019 001 A1 , There, the two upper feed dog are independently driven at different speeds to specify a radius of curvature of a feed sheet for the fabric. Such a drive is expensive and also brings a high control, in particular synchronization effort with it.
  • the US 4,290,376 describes a fabric transport device with a lower feed dog and two upper feeders in the form of rollers 1 and 20, 27.
  • the roller 1 is pivotally mounted with respect to a bearing frame for the rollers 20, 27.
  • the US 2,907,291 describes a feed dog with two in the sewing direction successively arranged roles.
  • the radius of curvature of a feed sheet can also be set by specifying a slip difference between the two upper feeders.
  • an upper feed dog which is subject to slip, achieves the same effect in its feed effect as a slip-free upper feed dog with a lower transport speed.
  • the slip difference between the two upper feeders and thus the radius of curvature of the feed sheet can be varied. This way is through a mechanically adjustable with reasonable effort adjustable at least one of the two upper feed dog especially a stepless radius specification of the feed sheet possible.
  • a Raff feed can be realized with a predetermined Köselwert.
  • a stepper motor according to claim 2 allows a very accurate relative positioning of the two upper feed dog to each other, in particular a precise adjustment of one of the two upper feed dog.
  • a transmission according to claim 3 allows a very fine relative adjustment of the two upper feed dog to each other, so that the arc radius of a feed sheet can be specified exactly.
  • a toothed belt for transmission according to claim 4 is robust and low maintenance.
  • Two toothed belts as transmission elements according to claim 5 allow a good separation between the realizable by the transmission in practice functions "translation” and "path bridging".
  • a conveyor belt according to claim 6 allows an efficient and continuous mass transfer.
  • a spring preload according to claim 7 makes it possible for the displaceable upper feed dog to be able to move upwards even in a lowered feed slide position with a larger material thickness.
  • An adjustable stop according to claim 8 allows an adaptation of the sewing machine to different Nähgutdicken.
  • a sewing machine 1 has an upper arm 2, a vertical stand 3 and a lower housing, which is commonly referred to as a base plate 4.
  • the base plate 4 has an upwardly projecting column 5, for which reason the sewing machine 1 is also referred to as a column sewing machine.
  • a not shown arm shaft is rotatably mounted in the arm 2.
  • the drive of the arm shaft and thus the essential sewing components of the sewing machine 1 via a mounted in the base plate 4 drive motor 6 and a belt drive not shown in the drawing.
  • About the arm shaft and a crank mechanism is mounted vertically in the arm 2, not shown in the drawing needle bar vertically up and down driven, which carries a needle at its lower end. An approximate position of the needle bar is in the Fig. 1 indicated by dashed lines at 7.
  • a gripper is rotatably mounted in the column 5. Sewing parts to be sewn (compare the fabric part 8 in Fig. 6 ) are guided over a the needle column plate 9 forming the top of the column 5 and projecting laterally along the sewing direction over the column 5, through which the needle passes into the region of the gripper.
  • a lower feed dog assembly 10 and an upper feed dog assembly 11 are used.
  • the lower feed dog assembly 10 has two adjacent lower conveyor belts 12, 13, which are designed as polyurethane-coated timing belt.
  • the conveyor belts 12, 13 are driven by means of toothed pulleys 14 mounted in the column 5 by a common drive so that they move at the same speed relative to the throat plate 9 in the sewing direction.
  • the upper conveyor belts 15, 16 are stirred as a closed endless conveyor belts and also as a polyurethane-coated timing belt.
  • the upper conveyor belt 15 is arranged above the lower conveyor belt 12 and cooperates with this.
  • the upper conveyor belt 16 is disposed above the lower conveyor belt 13 and cooperates with this.
  • the upper conveyor belt 15 cooperates with the lower conveyor belt 12
  • the upper conveyor belt 15 is deflected by a guide roller 17.
  • the guiding and deflecting elements are supported by a support rod 18 fixed to the arm 2.
  • the upper conveyor belt 15 is driven via a toothed disk 19.
  • the latter is driven via a deflection gear 20 by a belt drive stepping motor 21.
  • the second upper conveyor belt 16 is where it interacts with the lower conveyor belt 13, deflected by a guide roller 22.
  • the latter is supported by an adjusting or pivot lever 23, which has substantially the shape of a toggle lever.
  • the adjusting lever 23 is driven to pivot about a in the Fig. 4 dashed lines indicated pivot axis 24th
  • Fig. 4 shows the adjusting lever 23 in a position in which the deflection roller 22 and thus the upper conveyor belt sixteenth is lowered at most relative to the lower conveyor belt 13. This position is also referred to below as the minimum slip position.
  • Fig. 5 shows the position at which the adjusting lever 23 and thus the guide roller 22 is driven about the pivot axis 24 driven in a maximum relative to the lower conveyor belt 13 raised position. This position is also referred to below as the maximum slip position.
  • the toothed belt 28 In the power transmission from the adjusting stepper motor 29 to the toothed wheel 25, the toothed belt 28 essentially provides for the reduction of the rotational movement of the drive shaft of the stepping motor 29 in the rotational movement of the toothed disk 25.
  • the timing belt 26 ensures the spatial bridging of the transmission path of the toothed disc 27th adjacent pulley towards the toothed disc 25th
  • the toothed wheel 31 has a larger number of teeth than the toothed disk 19, which is why, since both toothed disks 19, 31 are driven by the same belt drive stepping motor 21, the adjustable upper conveyor belt 16 rotates at a greater transport speed than the upper transport belt 15 which is not adjustable in height.
  • One of the guide roller 22 opposite lever leg 32 of the adjusting lever 23 has a stop carrier 33 which carries an adjustable stop 34 in the form of a set screw.
  • the lever arm 32 is supported on a non-rotatably connected to the toothed pulley 25 transmission lever 35 from.
  • the Verstellverschwenkung of the adjusting lever 23 from the minimum to the maximum slip position by means of driven rotation of the toothed wheel 25 is effected by transmission by means of the transmission lever 35th
  • the adjusting lever 23 is pivotable relative to the transmission lever 35 about a further pivot axis 36 which in the Fig. 4 also indicated by dashed lines. If the transmission lever 35 is moved from the minimum slip position about the pivot axis 24 into the maximum slip position, the relative pivoting of the adjustment lever 23 to the adjustment lever 35 about the pivot axis 36 due to the stop 34 is blocked. However, a free pivoting of the adjusting lever 23 about the pivot axis 36 for deflecting the guide roller 22 upwards is possible, with the stop 34 lifts off from the transmission lever 35 during this pivoting. This situation is in the Fig. 6 shown. This adjustment movement of the adjusting lever 23 relative to the transmission lever 35 with lifting of the stop 34 takes place against the bias of a tension spring 37 which is fixed at one end to the transmission lever 35 and at the other end on the lever arm 32 of the adjusting lever 23.
  • the radius of an arcuate feed for a workpiece for example, the workpiece 8 in the Fig. 6
  • the radius of an arcuate feed for a workpiece for example, the workpiece 8 in the Fig. 6
  • the in the Fig. 4 shown minimum slip position are both upper conveyor belts 15, 16 substantially slip-free on the upper fabric part. Since that is adjustable upper conveyor belt 16 moves faster than the other upper conveyor belt 15, which extends from the upper feed dog assembly 11 sewing material in an arc, the guide roller 22 is arranged inside the bow. This feed sheet has a minimum radius.
  • Fig. 5 In the maximum slip position after Fig. 5 is the adjustable upper conveyor belt 16 under slip into engagement with the transported from the upper feed dog assembly 11 sewing material.
  • the other upper conveyor belt 15 is slip-free with the work piece in engagement.
  • the slip of the adjustable upper conveyor belt 16 may, depending on the setting of the maximum slip position in particular cause the slip effect the arc effect of the upper feed dog assembly 11 due to the different transport speeds of the upper conveyor belts 15, 16 compensated exactly, so in the maximum slip position the Sewing material along the sewing direction exactly straight, so not in the bow, is transported.
  • the radius of the feed arc starting from the minimum radius at the minimum slip position, becomes larger and larger. In this way, can be on the adjustment of the adjustable upper conveyor belt 16, the radius of the feed sheet for the transported with the upper feed dog assembly 11 material pretend. In this way, for example, sleeves of different sizes can be sewn.
  • the dependence of the radius of curvature of the feed sheet of the adjustment of the guide roller 22 and thus the conveyor belt 16 can for each material position to be sewn in advance by means of a teach-in algorithm be determined.
  • a control panel then allows an operator to enter which sleeve size should be sewn.
  • a control of the sewing machine determines a radius of curvature for the feed sheet.
  • the adjustment lever 23 is pivoted about the pivot axis 24 with the aid of the adjusting stepping motor 29, so that the deflection roller 22 comes with the adjustable upper conveyor belt 16 in the position associated with this radius of curvature above the lower conveyor belt 13. Now the sleeve can be sewn in the specified size.
  • the tension spring 37 is used to bias the Vertellhebels 23 and thus the upper conveyor belt 16 in a lower feed dog position.
  • the upper feed dog 16 is pivotally mounted about the pivot axis 36 so that it can be displaced upwards against the bias of the compression spring 37, depending on the thickness of the workpiece 8.

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

Eine derartige Nähmaschine ist bekannt aus der DE 10 2004 019 001 A1 . Dort werden zur Vorgabe eines Bogenradius eines Vorschubbogens für das Nähgut die beiden oberen Stoffschieber unabhängig voneinander mit unterschiedlichen Drehzahlen angetrieben. Ein derartiger Antrieb ist teuer und bringt zudem einen hohen Steuerungs-, insbesondere Synchronisationsaufwand mit sich.Such a sewing machine is known from the DE 10 2004 019 001 A1 , There, the two upper feed dog are independently driven at different speeds to specify a radius of curvature of a feed sheet for the fabric. Such a drive is expensive and also brings a high control, in particular synchronization effort with it.

Die US 4,290,376 beschreibt eine Stoff-Transportvorrichtung mit einem unteren Stoffschieber und zwei oberen Stoffschiebern in Form von Rollen 1 und 20, 27. Die Rolle 1 ist in Bezug auf einen Lagerrahmen für die Rollen 20, 27 schwenkbar gelagert.The US 4,290,376 describes a fabric transport device with a lower feed dog and two upper feeders in the form of rollers 1 and 20, 27. The roller 1 is pivotally mounted with respect to a bearing frame for the rollers 20, 27.

Die US 2,907,291 beschreibt einen Stoffschieber mit zwei in Nährichtung hintereinander angeordneten Rollen.The US 2,907,291 describes a feed dog with two in the sewing direction successively arranged roles.

Es ist daher eine Aufgabe der vorliegenden Erfindung, eine Nähmaschine der eingangs genannten Art derart weiterzubilden, dass der Bogenradius eines Vorschubbogens für das Nähgut vorgebbar ist, ohne dass die beiden oberen Stoffschieber unabhängig voneinander angetrieben werden müssen.It is therefore an object of the present invention, a sewing machine of the type mentioned in such a way that the arc radius of a feed sheet for the fabric can be specified without the two upper feed dog to be driven independently.

Diese Aufgabe ist erfindungsgemäß gelöst durch einen Nähmaschine mit den im Kennzeichnungsteil des Anspruchs 1 angegebenen Merkmalen.This object is achieved by a sewing machine with the features specified in the characterizing part of claim 1.

Erfindungsgemäß wurde erkannt, dass sich der Bogenradius eines Vorschubbogens auch über die Vorgabe einer Schlupfdifferenz zwischen den beiden oberen Stoffschiebern einstellen lässt. Dabei wurde insbesondere erkannt, dass ein oberer Stoffschieber, der schlupfbehaftet ist, in seiner Vorschubwirkung den gleichen Effekt erzielt wie ein schlupfloser oberer Stoffschieber mit geringerer Transportgeschwindigkeit. Über die Verstellung der beiden oberen Stoffschieber relativ zueinander kann die Schlupfdifferenz zwischen den beiden oberen Stoffschiebern und damit der Bogenradius des Vorschubbogens variiert werden. Auf diese Weise ist durch eine mechanisch mit vertretbarem Aufwand realisierbare Verstellbarkeit mindestens eines der beiden oberen Stoffschieber insbesondere eine stufenlose Radiusvorgabe des Vorschubbogens möglich. Durch einen unabhängigen Antrieb der oberen Stoffschieber einerseits und der unteren Stoffschieber andererseits lässt sich insbesondere auch ein Raff-Vorschub mit vorgebbarem Kräuselwert realisieren.According to the invention, it has been recognized that the radius of curvature of a feed sheet can also be set by specifying a slip difference between the two upper feeders. In particular, it was recognized that an upper feed dog, which is subject to slip, achieves the same effect in its feed effect as a slip-free upper feed dog with a lower transport speed. About the adjustment of the two upper feed dog relative to each other, the slip difference between the two upper feeders and thus the radius of curvature of the feed sheet can be varied. This way is through a mechanically adjustable with reasonable effort adjustable at least one of the two upper feed dog especially a stepless radius specification of the feed sheet possible. By an independent drive of the upper feed dog on the one hand and the lower feed dog on the other hand, in particular, a Raff feed can be realized with a predetermined Kräuselwert.

Ein Schrittmotor nach Anspruch 2 ermöglicht eine sehr genaue Relativpositionierung der beiden oberen Stoffschieber zueinander, insbesondere eine genaue Verstellung eines der beiden oberen Stoffschieber.A stepper motor according to claim 2 allows a very accurate relative positioning of the two upper feed dog to each other, in particular a precise adjustment of one of the two upper feed dog.

Ein Getriebe nach Anspruch 3 ermöglicht eine sehr feine Relativverstellung der beiden oberen Stoffschieber zueinander, sodass der Bogenradius eines Vorschubbogens exakt vorgegeben werden kann.A transmission according to claim 3 allows a very fine relative adjustment of the two upper feed dog to each other, so that the arc radius of a feed sheet can be specified exactly.

Ein Zahnriemen zur Übertragung nach Anspruch 4 ist robust und wartungsarm.A toothed belt for transmission according to claim 4 is robust and low maintenance.

Zwei Zahnriemen als Übertragungselemente nach Anspruch 5 erlauben eine gute Trennung zwischen den durch das Getriebe in der Praxis zu realisierenden Funktionen "Übersetzung" und "Wegüberbrückung".Two toothed belts as transmission elements according to claim 5 allow a good separation between the realizable by the transmission in practice functions "translation" and "path bridging".

Ein Transportband nach Anspruch 6 erlaubt einen effizienten und kontinuierlichen Stofftransport.A conveyor belt according to claim 6 allows an efficient and continuous mass transfer.

Eine Federvorspannung nach Anspruch 7 ermöglicht, dass der verlagerbare obere Stoffschieber auch in einer abgesenkten Stoffschieber-Position bei größerer Nähgutdicke nach oben ausweichen kann.A spring preload according to claim 7 makes it possible for the displaceable upper feed dog to be able to move upwards even in a lowered feed slide position with a larger material thickness.

Ein verstellbarer Anschlag nach Anspruch 8 erlaubt eine Anpassung der Nähmaschine an unterschiedliche Nähgutdicken.An adjustable stop according to claim 8 allows an adaptation of the sewing machine to different Nähgutdicken.

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

Fig. 1
perspektivisch eine Nähmaschine, bei der zur Sichtbarmachung interner Details Gehäuseelemente abgenommen sind;
Fig. 2
perspektivisch einen Ausschnitt der Nähmaschine nach Fig. 1 mit Blickrichtung auf eine obere Stoffschieber-Baugruppe;
Fig. 3
eine perspektivische Ansicht eines nähgutseitigen Abschnitts der oberen Stoffschieber-Baugruppe, wobei ein verlagerbarer oberer Stoffschieber in einer maximal abgesenkten Position dargestellt ist, gesehen aus einer Blickrichtung, die derjenigen nach Fig. 2 in etwa entgegengesetzt ist;
Fig. 4
eine zu Fig. 3 ähnliche Darstellung, wobei ein Tragteil der oberen Stoffschieber-Baugruppe zur Sichtbarmachung dahinterliegender Details weggelassen ist;
Fig. 5
eine zu Fig. 4 ähnliche Darstellung, bei der der verlagerbare obere Stoffschieber in eine maximal angehobene Position verstellt ist; und
Fig. 6
eine zu Fig. 4 ähnliche Darstellung, bei der der verlagerbare obere Stoffschieber durch Nähgut aus der maximal nach unten verstellten Position entgegen der Vorspannung einer Feder nach oben gedrückt ist.
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 which housing elements are removed for visualization of internal details;
Fig. 2
perspective view of a section of the sewing machine Fig. 1 looking towards an upper feed dog assembly;
Fig. 3
a perspective view of a fabric-side portion of the upper feed dog assembly, wherein a displaceable upper feed dog is shown in a maximum lowered position, seen from a line of sight, that of Fig. 2 is approximately opposite;
Fig. 4
one too Fig. 3 similar view, wherein a support member of the upper feed dog assembly for visualization of underlying details is omitted;
Fig. 5
one too Fig. 4 similar view, in which the displaceable upper feed dog is moved to a maximum raised position; and
Fig. 6
one too Fig. 4 similar representation in which the displaceable upper feed dog is pressed by fabric from the maximum downwardly adjusted position against the bias of a spring upwards.

Eine Nähmaschine 1 hat einen oberen Arm 2, einen vertikalen Ständer 3 und ein unteres Gehäuse, das üblicherweise als Grundplatte 4 bezeichnet ist. Die Grundplatte 4 hat eine nach oben ragende Säule 5, weshalb die Nähmaschine 1 auch als Säulen-Nähmaschinen bezeichnet wird. Im Arm 2 ist eine nicht näher dargestellte Armwelle drehbar gelagert. Der Antrieb der Armwelle und damit der wesentlichen Nähkomponenten der Nähmaschine 1 erfolgt über einen in der Grundplatte 4 montierten Antriebsmotor 6 und einen in der Zeichnung nicht näher dargestellten Riemenantrieb. Über die Armwelle und einen Kurbeltrieb ist eine im Arm 2 vertikal gelagerte, in der Zeichnung nicht dargestellte Nadelstange vertikal auf- und abgehend antreibbar, die an ihrem unteren Ende eine Nadel trägt. Eine ungefähre Position der Nadelstange ist in der Fig. 1 gestrichelt bei 7 angedeutet. Unterhalb der Nadelstange ist in der Säule 5 ein Greifer drehantreibbar gelagert. Zu vernähende Nähgutteile (vergleiche das Nähgutteil 8 in Fig. 6) werden über eine die Oberseite der Säule 5 bildende und seitlich längs der Nährichtung über die Säule 5 überstehende Stichlochplatte 9 geführt, durch die die Nadel in den Bereich des Greifers hindurchtritt.A sewing machine 1 has an upper arm 2, a vertical stand 3 and a lower housing, which is commonly referred to as a base plate 4. The base plate 4 has an upwardly projecting column 5, for which reason the sewing machine 1 is also referred to as a column sewing machine. In the arm 2, a not shown arm shaft is rotatably mounted. The drive of the arm shaft and thus the essential sewing components of the sewing machine 1 via a mounted in the base plate 4 drive motor 6 and a belt drive not shown in the drawing. About the arm shaft and a crank mechanism is mounted vertically in the arm 2, not shown in the drawing needle bar vertically up and down driven, which carries a needle at its lower end. An approximate position of the needle bar is in the Fig. 1 indicated by dashed lines at 7. Below the needle bar a gripper is rotatably mounted in the column 5. Sewing parts to be sewn (compare the fabric part 8 in Fig. 6 ) are guided over a the needle column plate 9 forming the top of the column 5 and projecting laterally along the sewing direction over the column 5, through which the needle passes into the region of the gripper.

Zum Vorschieben der miteinander zu vernähenden Nähgutteile in Nährichtung der Nähmaschine 1 dienen eine untere Stoffschieber-Baugruppe 10 und eine obere Stoffschieber-Baugruppe 11.For advancing the workpieces to be sewn together in the sewing direction of the sewing machine 1, a lower feed dog assembly 10 and an upper feed dog assembly 11 are used.

Die untere Stoffschieber-Baugruppe 10 hat zwei nebeneinander laufende untere Transportbänder 12, 13, die als Polyurethan-beschichtete Zahnriemen ausgeführt sind. Die Transportbänder 12, 13 werden über in der Säule 5 gelagerte Zahnscheiben 14 von einem gemeinsamen Antrieb so angetrieben, dass sie sich relativ zur Stichplatte 9 in der Nährichtung mit der gleichen Geschwindigkeit bewegen.The lower feed dog assembly 10 has two adjacent lower conveyor belts 12, 13, which are designed as polyurethane-coated timing belt. The conveyor belts 12, 13 are driven by means of toothed pulleys 14 mounted in the column 5 by a common drive so that they move at the same speed relative to the throat plate 9 in the sewing direction.

Jeweils mit einem der beiden unteren Transportbänder 12, 13 zum Nähgut-Vorschub wirken zwei obere Transportbänder 15, 16 zusammen. Die oberen Transportbänder 15, 16 sind als geschlossene Endlos-Transportbänder und ebenfalls als Polyurethan-beschichtete Zahnriemen ausgerührt. Das obere Transportband 15 ist dabei oberhalb des unteren Transportbands 12 angeordnet und wirkt mit diesem zusammen. Das obere Transportband 16 ist oberhalb des unteren Transportbands 13 angeordnet und wirkt mit diesem zusammen.Each with one of the two lower conveyor belts 12, 13 for sewing material feed act two upper conveyor belts 15, 16 together. The upper conveyor belts 15, 16 are stirred as a closed endless conveyor belts and also as a polyurethane-coated timing belt. The upper conveyor belt 15 is arranged above the lower conveyor belt 12 and cooperates with this. The upper conveyor belt 16 is disposed above the lower conveyor belt 13 and cooperates with this.

Dort, wo das obere Transportband 15 mit dem unteren Transportband 12 zusammenwirkt, ist das obere Transportband 15 über eine Umlenkrolle 17 umgelenkt. Im weiteren Verlauf wird das obere Transportband 15 durch Umlenk- und Führungselemente so geführt, dass ein abwärtslaufendes Transportbandtrum benachbart zu einem aufwärtslaufenden Transportbandtrum läuft. Die Führungs- und Umlenkelemente sind getragen von einer am Arm 2 festgelegten Tragstange 18.Where the upper conveyor belt 15 cooperates with the lower conveyor belt 12, the upper conveyor belt 15 is deflected by a guide roller 17. In the course of the upper conveyor belt 15 is guided by deflection and guide elements so that a downwardly running conveyor belt run adjacent to an upwardly running conveyor belt run. The guiding and deflecting elements are supported by a support rod 18 fixed to the arm 2.

Angetrieben ist das obere Transportband 15 über eine Zahnscheibe 19. Letztere wird über ein Umlenkgetriebe 20 angetrieben von einem Bandantriebs-Schrittmotor 21.The upper conveyor belt 15 is driven via a toothed disk 19. The latter is driven via a deflection gear 20 by a belt drive stepping motor 21.

Das zweite obere Transportband 16 wird dort, wo es mit dem unteren Transportband 13 zusammenwirkt, von einer Umlenkrolle 22 umgelenkt. Letztere wird getragen von einem Verstell- beziehungsweise Schwenkhebel 23, der im Wesentlichen die Form eines Kniehebels hat. Der Verstellhebel 23 ist angetrieben verschwenkbar um eine in der Fig. 4 gestrichelt angedeutete Schwenkachse 24. Fig. 4 zeigt den Verstellhebel 23 in einer Position, in der die Umlenkrolle 22 und damit das obere Transportband 16 maximal relativ zum unteren Transportband 13 abgesenkt ist. Diese Position wird nachfolgend auch als Minimalschlupf-Position bezeichnet. Fig. 5 zeigt die Position, bei der der Verstellhebel 23 und damit die Umlenkrolle 22 um die Schwenkachse 24 angetrieben in eine maximal gegenüber dem unteren Transportband 13 angehobene Position verstellt ist. Diese Position wird nachfolgend auch als Maximalschlupf-Position bezeichnet.The second upper conveyor belt 16 is where it interacts with the lower conveyor belt 13, deflected by a guide roller 22. The latter is supported by an adjusting or pivot lever 23, which has substantially the shape of a toggle lever. The adjusting lever 23 is driven to pivot about a in the Fig. 4 dashed lines indicated pivot axis 24th Fig. 4 shows the adjusting lever 23 in a position in which the deflection roller 22 and thus the upper conveyor belt sixteenth is lowered at most relative to the lower conveyor belt 13. This position is also referred to below as the minimum slip position. Fig. 5 shows the position at which the adjusting lever 23 and thus the guide roller 22 is driven about the pivot axis 24 driven in a maximum relative to the lower conveyor belt 13 raised position. This position is also referred to below as the maximum slip position.

Der Antrieb des Verstellhebels 23 um die Schwenkachse 24 erfolgt über eine Zahnscheibe 25, einen Verstellantriebs-Zahnriemen 26, ein Paar benachbarter und auf der selben Welle gelagerter Zahnscheiben 27, einen Übertragungszahnriemen 28 und einen Verstell-Schrittmotor 29.The drive of the adjusting lever 23 about the pivot axis 24 via a toothed pulley 25, a Verstellantriebs timing belt 26, a pair of adjacent and mounted on the same shaft toothed discs 27, a transmission toothed belt 28 and an adjustment stepping motor 29th

Bei der Kraftübertragung vom Verstell-Schrittmotor 29 auf die Zahnscheibe 25 sorgt der Zahnriemen 28 im Wesentlichen für die Untersetzung des Drehbewegung der Antriebswelle des Schrittmotors 29 in die Drehbewegung der Zahnscheibe 25. Der Zahnriemen 26 sorgt für die räumliche Überbrückung des Übertragungsweges von der der Zahnscheibe 27 benachbarten Zahnscheibe hin zur Zahnscheibe 25.In the power transmission from the adjusting stepper motor 29 to the toothed wheel 25, the toothed belt 28 essentially provides for the reduction of the rotational movement of the drive shaft of the stepping motor 29 in the rotational movement of the toothed disk 25. The timing belt 26 ensures the spatial bridging of the transmission path of the toothed disc 27th adjacent pulley towards the toothed disc 25th

Der Vorschub-Antrieb des oberen Transportbandes 16 erfolgt über eine Zahnscheibe 31, die benachbart zur Zahnscheibe 19 angeordnet und auf der gleichen Welle wie diese drehfest zur Zahnscheibe 19 gelagert ist. Die Zahnscheibe 31 hat eine größere Zahnzahl als die Zahnscheibe 19, weshalb, da beide Zahnscheiben 19, 31 vom gleichen Bandantriebs-Schrittmotor 21 angetrieben sind, das verstellbare obere Transportband 16 mit größerer Transportgeschwindigkeit umläuft, als das in der Höhe nicht verstellbare obere Transportband 15.The feed drive of the upper conveyor belt 16 via a toothed wheel 31, which is adjacent to the toothed disc 19 and mounted on the same shaft as this rotatably mounted to the toothed disc 19. The toothed wheel 31 has a larger number of teeth than the toothed disk 19, which is why, since both toothed disks 19, 31 are driven by the same belt drive stepping motor 21, the adjustable upper conveyor belt 16 rotates at a greater transport speed than the upper transport belt 15 which is not adjustable in height.

Ein der Umlenkrolle 22 gegenüberliegender Hebelschenkel 32 des Verstellhebels 23 hat einen Anschlagträger 33, der einen verstellbaren Anschlag 34 in Form einer Stellschraube trägt. Über den Anschlag 34 stützt sich der Hebelschenkel 32 an einem drehfest mit der Zahnscheibe 25 verbundenen Übertragungshebel 35 ab. Die Verstellverschwenkung des Verstellhebels 23 von der Minimal- zur Maximal-Schlupfposition mittels angetriebener Drehung der Zahnscheibe 25 erfolgt durch Übertragung mittels des Übertragungshebels 35.One of the guide roller 22 opposite lever leg 32 of the adjusting lever 23 has a stop carrier 33 which carries an adjustable stop 34 in the form of a set screw. About the stop 34, the lever arm 32 is supported on a non-rotatably connected to the toothed pulley 25 transmission lever 35 from. The Verstellverschwenkung of the adjusting lever 23 from the minimum to the maximum slip position by means of driven rotation of the toothed wheel 25 is effected by transmission by means of the transmission lever 35th

Der Verstellhebel 23 ist relativ zum Übertragungshebel 35 um eine weitere Schwenkachse 36 verschwenkbar, die in der Fig. 4 ebenfalls gestrichelt angedeutet ist. Wird der Übertragungshebel 35 von der Minimal-Schlupfposition um die Schwenkachse 24 in die Maximal-Schlupfposition verstellt, ist die Relativverschwenkung des Verstellhebels 23 zum Verstellhebel 35 um die Schwenkachse 36 aufgrund des Anschlags 34 blockiert. Eine freie Verschwenkung des Verstellhebels 23 um die Schwenkachse 36 zum Ausweichen der Umlenkrolle 22 nach oben ist jedoch möglich, wobei sich bei dieser Verschwenkung der Anschlag 34 vom Übertragungshebel 35 abhebt. Diese Situation ist in der Fig. 6 dargestellt. Diese Verstellbewegung des Verstellhebels 23 relativ zum Übertragungshebel 35 mit Abheben des Anschlags 34 erfolgt entgegen der Vorspannung einer Zugfeder 37, die an einem Ende am Übertragungshebel 35 und am anderen Ende am Hebelschenkel 32 des Verstellhebels 23 festgelegt ist.The adjusting lever 23 is pivotable relative to the transmission lever 35 about a further pivot axis 36 which in the Fig. 4 also indicated by dashed lines. If the transmission lever 35 is moved from the minimum slip position about the pivot axis 24 into the maximum slip position, the relative pivoting of the adjustment lever 23 to the adjustment lever 35 about the pivot axis 36 due to the stop 34 is blocked. However, a free pivoting of the adjusting lever 23 about the pivot axis 36 for deflecting the guide roller 22 upwards is possible, with the stop 34 lifts off from the transmission lever 35 during this pivoting. This situation is in the Fig. 6 shown. This adjustment movement of the adjusting lever 23 relative to the transmission lever 35 with lifting of the stop 34 takes place against the bias of a tension spring 37 which is fixed at one end to the transmission lever 35 and at the other end on the lever arm 32 of the adjusting lever 23.

Mit Hilfe des verstellbaren oberen Transportbandes 16 kann der Radius eines bogenförmigen Vorschubs für ein Nähgutteil, zum Beispiel das Nähgutteil 8 in der Fig. 6, einstellbar vorgegeben werden. In der in der Fig. 4 gezeigten Minimal-Schlupfposition liegen beide oberen Transportbänder 15, 16 im Wesentlichen schlupffrei am oberen Nähgutteil an. Da sich das verstellbare obere Transportband 16 schneller bewegt als das andere obere Transportband 15, verläuft das von der oberen Stoffschieber-Baugruppe 11 vorgeschobene Nähgut in einem Bogen, wobei die Umlenkrolle 22 bogeninnenseitig angeordnet ist. Dieser Vorschubbogen hat einen minimalen Radius.With the aid of the adjustable upper conveyor belt 16, the radius of an arcuate feed for a workpiece, for example, the workpiece 8 in the Fig. 6 , be specified adjustable. In the in the Fig. 4 shown minimum slip position are both upper conveyor belts 15, 16 substantially slip-free on the upper fabric part. Since that is adjustable upper conveyor belt 16 moves faster than the other upper conveyor belt 15, which extends from the upper feed dog assembly 11 sewing material in an arc, the guide roller 22 is arranged inside the bow. This feed sheet has a minimum radius.

In der Maximal-Schlupfposition nach Fig. 5 steht das verstellbare obere Transportband 16 unter Schlupf in Eingriff mit dem von der oberen Stoffschieber-Baugruppe 11 transportierten Nähgut. Das andere obere Transportband 15 steht schlupffrei mit dem Nähgutteil in Eingriff. Der Schlupf des verstellbaren oberen Transportbandes 16 kann je nach Einstellung der Maximal-Schlupfposition insbesondere dazu führen, dass die Schlupfwirkung die Bogenwirkung der oberen Stoffschieber-Baugruppe 11 aufgrund der unterschiedlichen Transportgeschwindigkeiten der oberen Transportbänder 15, 16 genau kompensiert, sodass in der Maximal-Schlupfposition das Nähgutteil längs der Nährichtung exakt geradlinig, also nicht im Bogen, transportiert wird. In den Stellungen zwischen der Minimal- und der Maximal-Schlupfposition wird, je weiter sich die Umlenkrolle 22 von der Minimal-Schlupfposition entfernt, der Radius des Vorschubbogens, ausgehend vom minimalen Radius bei der Minimal-Schlupfposition, immer größer. Auf diese Weise lässt sich über die Verstellung des verstellbaren oberen Transportbandes 16 der Radius des Vorschubbogens für das mit der oberen Stoffschieber-Baugruppe 11 transportierte Nähgut vorgeben. Auf diese Weise können beispielsweise Ärmel unterschiedlicher Größen eingenäht werden.In the maximum slip position after Fig. 5 is the adjustable upper conveyor belt 16 under slip into engagement with the transported from the upper feed dog assembly 11 sewing material. The other upper conveyor belt 15 is slip-free with the work piece in engagement. The slip of the adjustable upper conveyor belt 16 may, depending on the setting of the maximum slip position in particular cause the slip effect the arc effect of the upper feed dog assembly 11 due to the different transport speeds of the upper conveyor belts 15, 16 compensated exactly, so in the maximum slip position the Sewing material along the sewing direction exactly straight, so not in the bow, is transported. In the positions between the minimum and the maximum slip position, the farther the deflection roller 22 moves away from the minimum slip position, the radius of the feed arc, starting from the minimum radius at the minimum slip position, becomes larger and larger. In this way, can be on the adjustment of the adjustable upper conveyor belt 16, the radius of the feed sheet for the transported with the upper feed dog assembly 11 material pretend. In this way, for example, sleeves of different sizes can be sewn.

Die Abhängigkeit des Bogenradius des Vorschubbogens von der Verstellposition der Umlenkrolle 22 und damit des Transportbands 16 kann für jede zu vernähende Stoffposition vorab mit Hilfe eins Teach-In-Algorithmus bestimmt werden. Über ein Bedienfeld kann dann eine Bedienperson eingeben, welche Ärmelgröße eingenäht werden soll. Je nach Ärmelgröße bestimmt eine Steuerung der Nähmaschine einen Bogenradius für den Vorschubbogen. Abhängig vom bestimmten Bogenradius wird mit Hilfe des Verstell-Schrittmotors 29 der Verstellhebel 23 um die Schwenkachse 24 verschwenkt, sodass die Umlenkrolle 22 mit dem verstellbaren oberen Transportband 16 in die diesem Bogenradius zugeordnete Position über dem unteren Transportband 13 kommt. Nun kann der Ärmel in der vorgegebenen Größe eingenäht werden.The dependence of the radius of curvature of the feed sheet of the adjustment of the guide roller 22 and thus the conveyor belt 16 can for each material position to be sewn in advance by means of a teach-in algorithm be determined. A control panel then allows an operator to enter which sleeve size should be sewn. Depending on the sleeve size, a control of the sewing machine determines a radius of curvature for the feed sheet. Depending on the specific radius of curvature, the adjustment lever 23 is pivoted about the pivot axis 24 with the aid of the adjusting stepping motor 29, so that the deflection roller 22 comes with the adjustable upper conveyor belt 16 in the position associated with this radius of curvature above the lower conveyor belt 13. Now the sleeve can be sewn in the specified size.

Aufgrund der Verlagerbarkeit des verstellbaren oberen Transportbandes 16 zwischen der Minimal- und der Maximal-Schlupfposition findet zwischen diesen beiden Positionen eine Verlagerung der beiden oberen Transportbänder 15, 16 relativ zueinander im Bezug auf ihren Abstand zu den unteren Transportbändern 12, 13 statt.Due to the displaceability of the adjustable upper conveyor belt 16 between the minimum and the maximum slip position takes place between these two positions, a displacement of the two upper conveyor belts 15, 16 relative to each other with respect to their distance from the lower conveyor belts 12, 13.

Die Zugfeder 37 dient zur Vorspannung des Vertellhebels 23 und damit des oberen Transportbandes 16 in eine untere Stoffschieber-Position. Gleichzeitig ist der obere Stoffschieber 16 um die Schwenkachse 36 schwenkbar so gelagert, dass er abhängig von der Dicke des Nähgutteils 8 gegen die Vorspannung der Druckfeder 37 nach oben hin verlagerbar ist.The tension spring 37 is used to bias the Vertellhebels 23 and thus the upper conveyor belt 16 in a lower feed dog position. At the same time the upper feed dog 16 is pivotally mounted about the pivot axis 36 so that it can be displaced upwards against the bias of the compression spring 37, depending on the thickness of the workpiece 8.

Claims (8)

  1. Sewing machine (1) for sewing two pieces of fabric, comprising
    - at least one lower feeder (12, 13) for feeding the fabric,
    - two upper feeders (15, 16) arranged next to one another for feeding the fabric,
    characterized in that at least one (16) of the two upper feeders (15, 16) is displaceable by a distance relative to the lower feeder (12, 13) in such a way that it is possible to change between at least two feeder positions in which the two upper feeders (15, 16) are displaced relative to one another with respect to their distance to the lower feeder (12, 13) for defining a curve radius of a feed curve for the fabric.
  2. Sewing machine according to claim 1, characterized in that a displacement drive for displacing the upper feeder (16) between the two feeder positions has a stepper motor (29).
  3. Sewing machine according to claim 2, characterized in that the stepper motor (29) cooperates with a gearbox (25 to 28) to drive a pivoting motion of a pivoting lever (23) of the upper feeder (16).
  4. Sewing machine according to claim 3, characterized in that the gearbox (25 to 28) has at least one toothed belt (26, 28) as transmission element.
  5. Sewing machine according to claim 4, characterized in that the gearbox (25 to 28) has two toothed belts (26, 28) as transmission elements.
  6. Sewing machine according to any one of claims 1 to 5, characterized in that at least the movable upper feeder (16) has a circulating feed band which may be positioned against the fabric.
  7. Sewing machine according to any one of claims 1 to 6, characterized in that the at least one movable upper feeder (16) is biased by a spring (37) in a lower feeder position displaced towards the fabric, the upper feeder (16) being mounted so as to be displaceable upwards against the bias of the spring (37) depending on the thickness of the fabric.
  8. Sewing machine according to claim 7, characterized in that the lower feeder position biased by the spring (37) is predetermined by an adjustable stop (34).
EP07013634.6A 2006-09-08 2007-07-12 Sewing machine Active EP1897984B1 (en)

Applications Claiming Priority (1)

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DE102006042334A DE102006042334A1 (en) 2006-09-08 2006-09-08 sewing machine

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EP1897984A2 EP1897984A2 (en) 2008-03-12
EP1897984A3 EP1897984A3 (en) 2010-01-06
EP1897984B1 true EP1897984B1 (en) 2014-01-01

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EP (1) EP1897984B1 (en)
JP (1) JP2008062054A (en)
KR (1) KR101420870B1 (en)
CN (1) CN101139783B (en)
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JP2009089833A (en) 2007-10-05 2009-04-30 Juki Corp Cloth feeder of sewing machine
DE102008030797A1 (en) 2008-06-28 2009-12-31 Dürkopp Adler AG Sewing machine and method for operating such a sewing machine
DE102011052521B4 (en) 2011-08-09 2023-02-23 Chee Siang Industrial Co., Ltd. pillar sewing machine
DE102013208409A1 (en) 2013-05-07 2014-11-13 Dürkopp Adler AG Generation method for generating sewing control data
DE102013208408A1 (en) 2013-05-07 2014-11-13 Dürkopp Adler AG A method of generating sewing control data for executing a garment size dependent sewing program
DE102013208411A1 (en) 2013-05-07 2014-11-13 Dürkopp Adler AG Operating procedure for a sewing machine for sewing workpieces
DE102015207996B3 (en) * 2015-04-30 2016-10-27 Dürkopp Adler AG 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
DE102016011557A1 (en) * 2016-09-26 2018-03-29 Pfaff Industriesysteme Und Maschinen Gmbh Sewing machine with a puller device

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IT1100713B (en) * 1978-12-13 1985-09-28 Rockwell Rimoldi Spa PERFECT AUXILIARY TRANSPORT DEVICE FOR SEWING MACHINES WITH SEPARATOR KNIFE
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DE8525308U1 (en) * 1985-09-05 1987-09-03 Dorina Nähmaschinen GmbH, 7500 Karlsruhe Feed device on a sewing machine
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JP4509491B2 (en) * 2003-04-21 2010-07-21 Ｊｕｋｉ株式会社 Differential feed sewing machine

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DE102006042334A1 (en) 2008-03-27
KR101420870B1 (en) 2014-07-17
EP1897984A2 (en) 2008-03-12
KR20080023113A (en) 2008-03-12
CN101139783A (en) 2008-03-12
CN101139783B (en) 2012-10-10
EP1897984A3 (en) 2010-01-06
JP2008062054A (en) 2008-03-21

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