EP3399088B1 - Assembly and sewing machine for producing a starting upper thread with a set protrusion - Google Patents

Assembly and sewing machine for producing a starting upper thread with a set protrusion Download PDF

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Publication number
EP3399088B1
EP3399088B1 EP18167987.9A EP18167987A EP3399088B1 EP 3399088 B1 EP3399088 B1 EP 3399088B1 EP 18167987 A EP18167987 A EP 18167987A EP 3399088 B1 EP3399088 B1 EP 3399088B1
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EP
European Patent Office
Prior art keywords
upper thread
blade
thread
section
stop
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
Application number
EP18167987.9A
Other languages
German (de)
French (fr)
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EP3399088A1 (en
Inventor
Florian Schulz
Johann Enns
Frank Breder
Annelie Lückenbach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Duerkopp Adler AG
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Duerkopp Adler AG
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Publication date
Application filed by Duerkopp Adler AG filed Critical Duerkopp Adler AG
Publication of EP3399088A1 publication Critical patent/EP3399088A1/en
Application granted granted Critical
Publication of EP3399088B1 publication Critical patent/EP3399088B1/en
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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D05B65/02—Devices for severing the needle or lower thread controlled by the sewing mechanisms
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D05B65/06—Devices for severing the needle or lower thread and for disposing of the severed thread end ; Catching or wiping devices for the severed thread
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread

Definitions

  • the invention relates to an assembly for producing an upper seam beginning thread with a nominal seam overhang of at most 10 mm.
  • the invention also relates to a sewing machine with such an assembly.
  • Sewing machines are known from the EP 1 847 641 B1 , the DE 102 34 251 C1 , the DE 10 2006 019 193 A1 and the DE 101 23 075 C1 .
  • the DE 10 2015 223 194 B3 describes a method for generating an upper seam beginning thread with a short nominal seam protrusion and an assembly for carrying out the method.
  • the DE 34 34 40 874 A1 discloses a thread cutting device for a sewing machine.
  • the U.S. 6,062,152 A discloses an automatic thread cutting device for an embroidery machine.
  • the DE 38 12 092 C2 discloses a buttonhole sewing machine having a thread separating and clamping device.
  • the DE 100 63 003 B4 describes a thread cutter for a sewing machine.
  • the DE 197 19 847 A1 describes a thread trimmer of a sewing machine.
  • the DE 10 2006 059 192 A1 discloses a thread severing device of a sewing machine.
  • the DE 298 11 472 U1 discloses a thread cutting device for a sewing machine for chain stitch sewing work.
  • the DE 10 2007 056 132 A1 discloses a sewing machine having a thread cutting mechanism.
  • the DE 100 55 258 C1 discloses a thread cutter for use in a rotary hook sewing machine.
  • the CH 704 524 A1 discloses a method for cutting a lower and at least one upper thread for embroidery or sewing.
  • the DE 10 2016 102 024 A1 discloses a sewing machine having a thread cutting device for a sewing start end of a lower thread.
  • the US 2005/0178307 A1 describes a quilting machine.
  • the EP 2 206 820 A1 describes a thread cutting device for a sewing machine.
  • an upper thread detection section of an upper thread knife can be used simultaneously for clamping a seam starting upper thread and also for shearing off the seam starting upper thread in order to produce a defined short seam starting upper thread.
  • a compact assembly which on the one hand ensures a clamping and on the other hand a cutting of the upper thread, is thus made possible.
  • the counter knife can also represent the upper thread clamp. Alternatively, it is possible to design the upper thread clamp as a separate component from the counter knife.
  • the counter knife can be arranged fixed to the frame. Alternatively, it is possible that the counter knife moves relative to a frame of the sewing machine during cutting.
  • the upper thread gripping position, the upper thread clamping position and the upper thread cutting position are mutually different positions of the upper thread gripping section.
  • the upper thread clamping position can be a position of the upper thread gripping section which lies between the upper thread gripping position on the one hand and the upper thread cutting position on the other hand.
  • a displacement drive according to claim 2 is inexpensive.
  • a displacement drive according to claim 3 is precise.
  • the displacement drive can be designed as a lifting cylinder and in particular as a pneumatic lifting cylinder.
  • the displacement drive can be designed as a stepper motor.
  • This stepping motor can be controlled with a corresponding control in such a way that the three positions of the upper thread detection section correspond to corresponding stepping positions of the stepping motor. With such a stepper motor design, stops for presetting the position can be dispensed with.
  • An adjustable clamping position stop according to claim 4 simplifies the manufacture of the assembly.
  • a clamping position stop according to claim 5 is inexpensive to manufacture. Self-locking can be achieved by screwing the threaded pin into a plastic body fixed to the frame.
  • An adjustable cutting position stop according to claim 6 simplifies the manufacture of the assembly.
  • a stop body according to claim 7 enables precise adjustment of the cutting position stop, a force that is absorbed by the cutting position stop not acting in the direction of displacement of the stop body, which could lead to undesired slippage of the stop.
  • a suction device avoids undefined deposition of sections of the upper thread. This prevents undesirably cut thread remnants from collecting in the area of the sewing machine.
  • a sewing machine 1 designed in particular as a lockstitch sewing machine has a base plate 2 with a stand 3 extending upward therefrom and an angled arm 4. The latter ends in a head 5.
  • an arm shaft 6 is rotatably mounted.
  • the crank drive 7 is drivingly connected to a needle bar 9 which is mounted axially displaceably in the head 5.
  • the needle 10 can be moved up and down on a vertical axis 11 by the crank mechanism 7.
  • a Cartesian xyz coordinate system is used below.
  • the vertical axis 11 runs along the z direction of this coordinate system.
  • the x-direction runs perpendicular to the plane of the drawing Fig. 1 into this and runs parallel to a sewing direction of the sewing machine 1.
  • the y-direction runs in the Fig. 1 to the left.
  • the needle 10 guides in an eye a needle thread 13, which is also referred to as the upper thread, which is fed from a bobbin 12 via a thread tensioning device and the thread lever 8.
  • the needle thread 13 has a free upper thread starting section 13a.
  • the base plate 2 carries a support plate 14 which is fastened with screws and on which a workpiece 15 rests.
  • the support plate 14 has a recess designed for the passage of a lower material slide 17.
  • the latter has a needle hole 18 for the needle 10 to pass through.
  • a gripper 19 which has a gripper body 20 with a gripper tip 21.
  • a cup-shaped bobbin housing 22 for receiving a supply of hook thread in the form of a bobbin 22a is mounted in the hook body 20.
  • Upper edge contours on the one hand of the coil housing 22 and on the other hand of the coil 22a are shown in the schematic illustration according to FIG Fig. 2 indicated by dashed lines.
  • the looper thread is also known as the bobbin thread.
  • the gripper 19 can be rotated about a vertical gripper axis 23 running in the z direction.
  • a sewing operation direction of rotation 24 of the hook body 20 runs in FIG Fig. 3 clockwise around the gripper axis 23.
  • the gripper body 20 is firmly connected to a shaft 25 which runs coaxially to the gripper axis 23.
  • the shaft 25 is rotatably supported in a bearing block 26 screwed to the base plate 2.
  • a drive shaft 27 is mounted, which is connected to a gear mechanism arranged in the interior of the bearing block 26.
  • the gear transmission has a transmission ratio of 1: 2, so that with one revolution of the drive shaft 27, the gripper body 20 located on the shaft 25 rotates twice.
  • the drive shaft 27 is drivingly connected to the arm shaft 6 via a belt drive 28.
  • a thread-pulling knife 29 (cf. Fig. 3 ), for example from the EP 1 847 641 B1 is known.
  • the sewing machine 1 To hold and transport the workpiece 15, the sewing machine 1 also has a presser foot 30 and an upper conveyor 31, which interacts with the lower material slide 17 for transporting the workpiece.
  • the schematic Figure 2 also shows a course of the upper thread 13 from the bobbin 12 to the upper thread starting section 13a.
  • the upper thread 13 is guided to the needle 10 via a thread tensioning device 32 and the thread lever 8 and an upper thread guide clamp 33.
  • the upper thread guide clamp 33 has a tension washer 34 which is attached to a guide rod 35.
  • the tensioning disk 34 is pulled via a compression spring 36 against an abutment 37, which is fixed to the housing, of the upper thread guide clamp 33 in order to clamp the upper thread 13.
  • abutment 37 is a in the Fig. 2 attached schematically shown electromagnet 38, which is controlled via a central control device 39 of the sewing machine 1 in a manner not shown.
  • the assembly 40 is arranged on a side of this xz plane opposite the gripper 19 (cf. Fig. 1 and 3 ).
  • the assembly 40 has an upper thread catcher 41 for grasping a seam starting upper thread at the beginning of a seam to be sewn with the needle thread 13.
  • the upper thread catcher 41 has an upper thread knife 42 (see. Eg Fig. 5 ) with an upper thread gripping section 43 designed as a passage opening.
  • the upper thread catcher 41 also has a counter knife 44 which cooperates with the upper thread knife 42 to cut the needle thread 13.
  • the counter knife 44 is fixedly arranged in relation to a frame of the sewing machine 1.
  • the upper thread catcher 41 has an upper thread clamp 45.
  • the latter is designed as a U-shaped clamping spring.
  • a contact pressure of the clamping spring 45 against the needle thread knife 42 can be set via a clamping spring adjusting screw 46.
  • a knife pressure, that is to say a contact pressure of the counter knife 44 against the upper thread knife 42, can be set by means of a knife adjusting screw 47.
  • the upper thread detection position is in the Figures 4 to 6 shown.
  • the upper thread clamping position is in the Figures 7-11 shown.
  • the upper thread cutting position is in the Figures 12 to 15 shown.
  • the upper thread gripping position, the upper thread clamping position and the upper thread cutting position are mutually different positions of the upper thread gripping section 43. These three positions can be specified with the displacement drive 48, that is to say with exactly one drive.
  • a linear guide guides a displacement movement of the upper thread detection section 43 between the three aforementioned positions.
  • the linear guide comprises a guide pin 49 which runs approximately in the z-direction and is attached to a connecting piston 50 which is connected to a piston rod 51 of the lifting cylinder 48 in a tensile manner.
  • the guide pin 49 interacts with an elongated hole 52 in a mounting plate 53 of the assembly 40 to guide the displacement movement of the upper thread gripping section 43 (cf., for example, FIG Figures 4 and 5 ).
  • the upper thread knife 42 is attached to the guide pin 49.
  • the upper thread knife 42 In the upper thread detection position, the upper thread knife 42 is extended in the negative y-direction relative to the counter knife 44 so that the upper thread detection section 43 projects completely over the upper thread knife 42 and the upper thread clamp 45 and is freely accessible for the needle 10 to pass through.
  • An adjustable clamping position stop is used to preset a relative position of the upper thread knife 42 to the upper thread clamp 45 in the upper thread clamping position.
  • the clamping position stop contains a threaded pin 54 which is screwed into a plastic body 55. This results in a self-locking design of the threaded pin 54.
  • In the stop position of the clamping position stop i.e. in the upper thread clamping position after the Figures 7-11 , strikes a free end of the threaded pin 54 on the guide pin 49 and thus limits a movement of the upper thread knife 42, starting from the upper thread detection position in the positive y-direction, for example in the Fig. 7 to the left.
  • the threaded pin 54 is correspondingly rotated relative to the plastic body 55.
  • the threaded pin 54 is via a passage opening 56 (cf. Fig. 8 ) in a drive support plate 57 accessible from the outside.
  • the clamping position stop is between a particular in the Fig. 7 shown stop position and an ineffective neutral position displaceable. This neutral position is for example in the Figure 12 shown.
  • a clamping stop drive 58 which is also designed as a pneumatic lifting cylinder, is used for this displacement of the threaded pin 54 of the clamping position stop.
  • the plastic body 55 is connected to the clamping stop drive 58 via its piston rod 59.
  • the plastic body 55 is supported on the drive support plate 57 against the pretensioning force that the guide pin 49 exerts on the threaded pin 54 (cf. Fig. 7 ).
  • the clamping stop drive 58 is also mounted on the drive support plate 57.
  • the drive support plate 57 is bent into an L-shape, the upper thread gripping section displacement drive 48 being mounted on a first leg and the clamping stop drive 58 being mounted on a second leg of this L-shape.
  • a displacement movement by the clamping stop drive 58 takes place approximately perpendicular to the displacement movement by the displacement drive 48.
  • the upper thread In the upper thread clamping position, the upper thread is clamped between the upper thread clamp 45 and the upper thread knife 42. This clamping position is such that a cutting edge of the upper thread knife 42 does not yet interact with the counter knife for cutting the upper thread 13.
  • the assembly 40 also has an adjustable cutting position stop for specifying a relative position of the upper thread knife 42 to the counter knife 44 in the upper thread cutting position.
  • the cutting position stop has a stop body 60, which is supported by a stop plate (see Figures 12 and 13 ) is formed. The latter in turn interacts with the guide pin 49 of the assembly 40 in the cutting stop position of the cutting position stop.
  • a contact between the guide pin 49 and the stop plate 60 takes place in the area of an inclined wall section 61 of the stop plate 60, that is to say in the area of a Edge section, which in the plan after Fig. 13 assumes an angle to the x-axis or to the sewing direction.
  • a relative position of the stop plate 60 to the mounting plate 53 can be specified via a mounting connection which has an adjusting screw 62 which runs through an elongated hole 63 in the stop plate 60 running along the x-direction (cf. Fig. 13 ).
  • the stop plate 60 is displaced along the x direction so that a contact area between the guide pin 49 and the inclined wall section 61 in the cutting stop position moves accordingly along the y direction.
  • the stop body 60 can be displaced transversely to a cutting movement direction of the upper thread knife 42, that is to say transversely to the y direction.
  • the stop plate 60 In the stop position of the cutting position stop (cf. Fig. 13 ) the stop plate 60 is supported against the pretensioning force by the guide pin 49 on the drive carrier plate 57.
  • the cutting position stop acts when the clamping position stop has moved into the neutral position.
  • the assembly 40 also has a suction device 64 for suctioning off a section of the upper thread 13 that has been cut off with the upper thread knife 42 Upper thread knife 42 and the counter knife 44 opens out (cf. Fig. 12 ).
  • An opposite end 66 of the suction pipe 65 is connected to a vacuum source (not shown) of the suction device 64.
  • a section of the needle thread 13 is first transported from the upper side of the sewing material to a lower side of the sewing material 15 in the upper thread grasping position of the upper thread grasping section 43, the needle 10 passes through the opening of the upper thread engaging portion 43. Then the upper thread starting section 13a is pulled out with the looper 19 until the entire upper thread starting section 13a lies under the underside of the sewing material 15. After a first short stitch, when the thread lever 8 is in the region of the top dead center, the upper thread gripping section 43 is brought out of the upper thread gripping position into the drawn in upper thread clamping position by actuating the displacement drive 48.
  • the seam is then sewn with the normal stitch length.
  • a stitch length is preset with the aid of the control device 39.
  • the further seam with the participation of the upper thread 13 and the lower thread can be designed as a lockstitch seam.
  • a thread cutting operation of the upper thread 13 and the lower thread with the thread-pulling knife 29 then takes place.
  • FIG. 10 shows a seam 67 produced with the sewing assembly 40 in a seam starting section.
  • the sewing direction runs along the x-direction in the Fig. 6 to the left. Because of the upper thread section between the upper thread knife 42 and the counter knife 44, the upper thread starting section 13a at the beginning of the seam 67 is so short that a maximum seam protrusion A of 10 mm results.
  • the displacement drive 48 can also be designed as a stepping motor, the different positions of the upper thread detection section 43 then corresponding to different stepping positions of the stepping motor. These different step positions can be specified via the control device 39.

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

Description

Die Erfindung betrifft eine Baugruppe zum Erzeugen eines Naht-Anfangsoberfadens mit einem Soll-Nahtüberstand von höchstens 10mm. Ferner betrifft die Erfindung eine Nähmaschine mit einer derartigen Baugruppe.The invention relates to an assembly for producing an upper seam beginning thread with a nominal seam overhang of at most 10 mm. The invention also relates to a sewing machine with such an assembly.

Nähmaschinen sind bekannt aus der EP 1 847 641 B1 , der DE 102 34 251 C1 , der DE 10 2006 019 193 A1 und der DE 101 23 075 C1 . Die DE 10 2015 223 194 B3 beschreibt ein Verfahren zum Erzeugen eines Naht-Anfangsoberfadens mit kurzem Soll-Nahtüberstand sowie eine Baugruppe zur Durchführung des Verfahrens. Die DE 34 34 40 874 A1 offenbart eine Fadenschneidvorrichtung für eine Nähmaschine. Die US 6 062 152 A offenbart eine automatische Fadenschneideinrichtung für eine Stickmaschine. Die DE 38 12 092 C2 offenbart eine Knopflochnähmaschine mit einer Fadentrenn- und -klemmvorrichtung. Die DE 100 63 003 B4 beschreibt einen Fadenschneider für eine Nähmaschine. Die DE 197 19 847 A1 beschreibt eine Fadenabschneidevorrichtung eine Nähmaschine. Die DE 10 2006 059 192 A1 offenbart eine Fadenabtrennvorrichtung einer Nähmaschine. Die DE 298 11 472 U1 offenbart eine Fadenschneidvorrichtung für eine Nähmaschine für Kettenstichnäharbeiten. Die DE 10 2007 056 132 A1 offenbart eine Nähmaschine mit einem Fadenabschneidemechanismus. Die DE 100 55 258 C1 offenbart einen Fadenabschneider zum Einsatz in einer Nähmaschine mit rotierendem Greifer.Sewing machines are known from the EP 1 847 641 B1 , the DE 102 34 251 C1 , the DE 10 2006 019 193 A1 and the DE 101 23 075 C1 . the DE 10 2015 223 194 B3 describes a method for generating an upper seam beginning thread with a short nominal seam protrusion and an assembly for carrying out the method. the DE 34 34 40 874 A1 discloses a thread cutting device for a sewing machine. the U.S. 6,062,152 A discloses an automatic thread cutting device for an embroidery machine. the DE 38 12 092 C2 discloses a buttonhole sewing machine having a thread separating and clamping device. the DE 100 63 003 B4 describes a thread cutter for a sewing machine. the DE 197 19 847 A1 describes a thread trimmer of a sewing machine. the DE 10 2006 059 192 A1 discloses a thread severing device of a sewing machine. the DE 298 11 472 U1 discloses a thread cutting device for a sewing machine for chain stitch sewing work. the DE 10 2007 056 132 A1 discloses a sewing machine having a thread cutting mechanism. the DE 100 55 258 C1 discloses a thread cutter for use in a rotary hook sewing machine.

Die CH 704 524 A1 offenbart ein Verfahren zum Schneiden eines Unter- und mindestens eines Oberfadens zum Ansticken oder Annähen. Die DE 10 2016 102 024 A1 offenbart eine Nähmaschine mit einer Fadenschneideinrichtung für ein Nähstartende eines Unterfadens. Die US 2005/0178307 A1 beschreibt eine Steppmaschine. Die EP 2 206 820 A1 beschreibt eine Fadenschneidvorrichtung für eine Nähmaschine.the CH 704 524 A1 discloses a method for cutting a lower and at least one upper thread for embroidery or sewing. the DE 10 2016 102 024 A1 discloses a sewing machine having a thread cutting device for a sewing start end of a lower thread. the US 2005/0178307 A1 describes a quilting machine. the EP 2 206 820 A1 describes a thread cutting device for a sewing machine.

Es ist eine Aufgabe der vorliegenden Erfindung, eine Baugruppe der eingangs genannten Art derart weiterzubilden, dass ein reproduzierbarer, gewünschter kurzer Soll-Nahtüberstand erreicht wird. Gleichzeitig soll ein sicheres Annähen gewährleistet sein.It is an object of the present invention to develop an assembly of the type mentioned at the beginning in such a way that a reproducible, desired short desired seam projection is achieved. At the same time, safe sewing should be guaranteed.

Diese Aufgabe ist erfindungsgemäß gelöst durch eine Baugruppe mit den im Anspruch 1 angegebenen Merkmalen.This object is achieved according to the invention by an assembly having the features specified in claim 1.

Erfindungsgemäß wurde erkannt, dass ein Oberfaden-Erfassungsabschnitt eines Oberfadenmessers gleichzeitig zum Klemmen eines Naht-Anfangsoberfadens und auch zum Abscheren des Naht-Anfangsoberfadens zum Erzeugen eines definiert kurzen Naht-Anfangsoberfadens genutzt werden kann. Eine kompakte Baugruppe, die einerseits ein Klemmen und andererseits ein Schneiden des Anfangsoberfadens gewährleistet, ist somit ermöglicht. Das Gegenmesser kann gleichzeitig die Oberfadenklemme darstellen. Alternativ ist es möglich, die Oberfadenklemme als zum Gegenmesser separates Bauteil auszuführen. Das Gegenmesser kann rahmenfest angeordnet sein. Alternativ ist es möglich, dass sich beim Schneiden das Gegenmesser relativ zu einem Rahmen der Nähmaschine bewegt. Die Oberfaden-Erfassungsstellung, die Oberfaden-Klemmstellung und die Oberfaden-Schneidstellung sind voneinander verschiedene Stellungen des Oberfaden-Erfassungsabschnitts. Die Oberfaden-Klemmstellung kann eine Stellung des Oberfaden-Erfassungsabschnitts sein, die zwischen der Oberfaden-Erfassungsstellung einerseits und der Oberfaden-Schneidstellung andererseits liegt.According to the invention, it was recognized that an upper thread detection section of an upper thread knife can be used simultaneously for clamping a seam starting upper thread and also for shearing off the seam starting upper thread in order to produce a defined short seam starting upper thread. A compact assembly, which on the one hand ensures a clamping and on the other hand a cutting of the upper thread, is thus made possible. The counter knife can also represent the upper thread clamp. Alternatively, it is possible to design the upper thread clamp as a separate component from the counter knife. The counter knife can be arranged fixed to the frame. Alternatively, it is possible that the counter knife moves relative to a frame of the sewing machine during cutting. The upper thread gripping position, the upper thread clamping position and the upper thread cutting position are mutually different positions of the upper thread gripping section. The upper thread clamping position can be a position of the upper thread gripping section which lies between the upper thread gripping position on the one hand and the upper thread cutting position on the other hand.

Ein Verlagerungsantrieb nach Anspruch 2 ist kostengünstig.A displacement drive according to claim 2 is inexpensive.

Ein Verlagerungsantrieb nach Anspruch 3 ist präzise.A displacement drive according to claim 3 is precise.

Der Verlagerungsantrieb kann als Hubzylinder und insbesondere als pneumatischer Hubzylinder ausgeführt sein. Alternativ kann der Verlagerungsantrieb als Schrittmotor ausgeführt sein. Dieser Schrittmotor kann mit einer entsprechenden Steuerung so angesteuert sein, dass die drei Stellungen des Oberfaden-Erfassungsabschnitts entsprechenden Schrittpositionen des Schrittmotors entsprechen. Bei einer derartigen Schrittmotorgestaltung kann auf Anschläge zur Stellungsvorgabe verzichtet werden.The displacement drive can be designed as a lifting cylinder and in particular as a pneumatic lifting cylinder. Alternatively, the displacement drive can be designed as a stepper motor. This stepping motor can be controlled with a corresponding control in such a way that the three positions of the upper thread detection section correspond to corresponding stepping positions of the stepping motor. With such a stepper motor design, stops for presetting the position can be dispensed with.

Ein einstellbarer Klemmstellungsanschlag nach Anspruch 4 vereinfacht die Herstellung der Baugruppe.An adjustable clamping position stop according to claim 4 simplifies the manufacture of the assembly.

Ein Klemmstellungsanschlag nach Anspruch 5 ist kostengünstig in der Herstellung. Eine Selbsthemmung kann dadurch erreicht werden, dass der Gewindestift in einen rahmenfesten Kunststoff-Körper eingedreht ist.A clamping position stop according to claim 5 is inexpensive to manufacture. Self-locking can be achieved by screwing the threaded pin into a plastic body fixed to the frame.

Ein einstellbarer Schneidstellungsanschlag nach Anspruch 6 vereinfacht die Herstellung der Baugruppe.An adjustable cutting position stop according to claim 6 simplifies the manufacture of the assembly.

Ein Anschlagskörper nach Anspruch 7 ermöglicht eine präzise Einstellung des Schneidstellungsanschlags, wobei eine Kraft, die vom Schneidstellungsanschlag aufgenommen wird, nicht in der Verlagerungsrichtung des Anschlagskörpers wirkt, was zu einem unerwünschten Schlupf des Anschlags führen könnte.A stop body according to claim 7 enables precise adjustment of the cutting position stop, a force that is absorbed by the cutting position stop not acting in the direction of displacement of the stop body, which could lead to undesired slippage of the stop.

Eine Absaugeinrichtung nach Anspruch 8 vermeidet eine undefinierte Ablagerung von Abschnitten des Oberfadens. Hierdurch wird vermieden, dass sich unerwünscht abgeschnittene Fadenreste im Bereich der Nähmaschine ansammeln.A suction device according to claim 8 avoids undefined deposition of sections of the upper thread. This prevents undesirably cut thread remnants from collecting in the area of the sewing machine.

Die Vorteile einer Nähmaschine nach Anspruch 9 entsprechen denen, die vorstehend unter Bezugnahme auf die erfindungsgemäße Baugruppe bereits erläutert wurden.The advantages of a sewing machine according to claim 9 correspond to those which have already been explained above with reference to the assembly according to the invention.

Ausführungsbeispiele der Erfindung werden nachfolgend anhand der Zeichnung näher erläutert. In dieser zeigen:

Fig. 1
eine Vorderansicht einer Doppelsteppstichnähmaschine;
Fig. 2
eine perspektivische schematische Darstellung eines Stichbildungsbereiches der Nähmaschine;
Fig. 3
eine perspektivische Ansicht einer Grundplatte der Nähmaschine mit abgenommenen Komponenten, so dass eine Baugruppe zum Erzeugen eines Naht-Anfangsoberfadens mit vorgegebenem Soll-Nahtüberstand sichtbar ist;
Fig. 4
eine teilweise geschnittene Seitenansicht der Baugruppe zum Erzeugen des Naht-Anfangsoberfadens, wobei ein Oberfadenmesser mit einem Oberfaden-Erfassungsabschnitt in einer ganz ausgefahrenen Oberfaden-Erfassungsstellung dargestellt ist;
Fig. 5
die Baugruppe nach Fig. 4, gesehen von oben;
Fig. 6
die Baugruppe nach Fig. 4 in perspektivischer Ansicht schräg von oben;
Fig. 7
die Baugruppe nach Fig. 4 mit dem Oberfaden-Erfassungsabschnitt in einer eingezogenen Oberfaden-Klemmstellung;
Fig. 8
die Baugruppe, gesehen aus Blickrichtung VIII in Fig. 7;
Fig. 9
in einer zu Fig. 5 ähnlichen Darstellung die Baugruppe in der Stellung nach Fig. 7;
Fig. 10
in einer zu Fig. 6 ähnlichen Darstellung die Baugruppe in der Stellung nach Fig. 7;
Fig. 11
Die Baugruppe in der Stellung nach Fig. 7, gesehen perspektivisch schräg von unten;
Fig. 12
in einer zu Fig. 4 ähnlichen Darstellung die Baugruppe in einer relativ zur Oberfaden-Klemmstellung weiter eingezogenen Oberfaden-Schneidstellung des Oberfaden-Erfassungsabschnitts;
Fig. 13
einen teilweise gebrochenen Schnitt gemäß Linie XIII-XIII in Fig. 12;
Fig. 14
in einer zur Fig. 5 ähnlichen Darstellung die Baugruppe in der Stellung nach Fig. 12;
Fig. 15
die Baugruppe in einer zu Fig. 6 ähnlichen Darstellung in der Stellung nach Fig. 12; und
Fig. 16
schematisch eine Aufsicht auf eine mit der der Nähmaschine nach Fig. 1 genähte Naht zur Veranschaulichung eines erzeugten Naht-Anfangsoberfadens mit einem vorgegebenen Soll-Nahtüberstand.
Embodiments of the invention are explained in more detail below with reference to the drawing. In this show:
Fig. 1
a front view of a lockstitch sewing machine;
Fig. 2
a perspective schematic representation of a stitch formation area of the sewing machine;
Fig. 3
a perspective view of a base plate of the sewing machine with removed components, so that an assembly for generating a seam start needle thread with a predetermined desired seam projection is visible;
Fig. 4
a partially sectioned side view of the assembly for generating the seam starting needle thread, wherein an upper thread knife with an upper thread gripping portion is shown in a fully extended upper thread gripping position;
Fig. 5
the assembly according to Fig. 4 seen from above;
Fig. 6
the assembly according to Fig. 4 in a perspective view at an angle from above;
Fig. 7
the assembly according to Fig. 4 with the upper thread gripping section in a retracted upper thread clamping position;
Fig. 8
the assembly, seen from viewing direction VIII in Fig. 7 ;
Fig. 9
in one too Fig. 5 similar representation the assembly in the position according to Fig. 7 ;
Fig. 10
in one too Fig. 6 similar representation the assembly in the position according to Fig. 7 ;
Fig. 11
The assembly in the position after Fig. 7 , seen in perspective at an angle from below;
Fig. 12
in one too Fig. 4 In a similar illustration, the assembly in an upper thread cutting position of the upper thread gripping section which is further drawn in relative to the upper thread clamping position;
Fig. 13
a partially broken section along line XIII-XIII in Fig. 12 ;
Fig. 14
in one to Fig. 5 similar representation the assembly in the position according to Fig. 12 ;
Fig. 15
the assembly in one too Fig. 6 similar representation in the position after Fig. 12 ; and
Fig. 16
schematically a plan view of one with that of the sewing machine after Fig. 1 sewn seam to illustrate a generated upper seam thread with a specified nominal seam projection.

Eine insbesondere als Doppelsteppstichnähmaschine ausgeführte Nähmaschine 1 hat eine Grundplatte 2 mit einem sich davon aufwärts erstrecken den Ständer 3 und einem abgewinkelten Arm 4. Letzterer endet in einem Kopf 5. In dem Arm 4 ist eine Armwelle 6 drehbar gelagert. Diese treibt in dem Kopf 5 einen Kurbeltrieb 7 mit einem Fadenhebel 8 an. Der Kurbeltrieb 7 steht antriebsmäßig mit einer in dem Kopf 5 axial verschiebbar gelagerten Nadelstange 9 in Verbindung. Diese hat an ihrem unteren Ende eine Nadel 10. Die Nadel 10 ist durch den Kurbeltrieb 7 auf einer vertikalen Achse 11 auf- und abbewegbar.A sewing machine 1 designed in particular as a lockstitch sewing machine has a base plate 2 with a stand 3 extending upward therefrom and an angled arm 4. The latter ends in a head 5. In the arm 4, an arm shaft 6 is rotatably mounted. This drives a crank mechanism 7 with a thread lever 8 in the head 5. The crank drive 7 is drivingly connected to a needle bar 9 which is mounted axially displaceably in the head 5. This has a needle 10 at its lower end. The needle 10 can be moved up and down on a vertical axis 11 by the crank mechanism 7.

Zur Vereinfachung der Darstellung von Lagebeziehungen wird nachfolgend ein kartesisches xyz-Koordinatensystem verwendet. Die vertikale Achse 11 verläuft längs der z-Richtung dieses Koordinatensystems. Die x-Richtung verläuft senkrecht zur Zeichenebene der Fig. 1 in diese hinein und verläuft parallel zu einer Nährichtung der Nähmaschine 1. Die y-Richtung verläuft in der Fig. 1 nach links.To simplify the representation of positional relationships, a Cartesian xyz coordinate system is used below. The vertical axis 11 runs along the z direction of this coordinate system. The x-direction runs perpendicular to the plane of the drawing Fig. 1 into this and runs parallel to a sewing direction of the sewing machine 1. The y-direction runs in the Fig. 1 to the left.

Die Nadel 10 führt in einem Öhr einen von einer Spule 12 über eine Fadenspannungseinrichtung und den Fadenhebel 8 zugeführten Nadelfaden 13, der auch als Oberfaden bezeichnet ist. Der Nadelfaden 13 hat einen freien Oberfaden-Anfangsabschnitt 13a.The needle 10 guides in an eye a needle thread 13, which is also referred to as the upper thread, which is fed from a bobbin 12 via a thread tensioning device and the thread lever 8. The needle thread 13 has a free upper thread starting section 13a.

Die Grundplatte 2 trägt eine mit Schrauben befestigte Auflageplatte 14, auf der ein Nähgutteil 15 aufliegt. Die Auflageplatte 14 ist mit einer Ausnehmung für den Durchtritt eines unteren Stoffschiebers 17 ausgebildet. Letzterer hat ein Stichloch 18 für den Durchtritt der Nadel 10. Der Stoffschieber 17 befindet sich in bekannter Weise in Antriebsverbindung mit einem unterhalb der Grundplatte 2 angeordneten Schub- und Hubgetriebe.The base plate 2 carries a support plate 14 which is fastened with screws and on which a workpiece 15 rests. The support plate 14 has a recess designed for the passage of a lower material slide 17. The latter has a needle hole 18 for the needle 10 to pass through.

Unterhalb der Auflageplatte 14 befindet sich ein Greifer 19, der einen Greiferkörper 20 mit einer Greiferspitze 21 aufweist. In dem Greiferkörper 20 ist ein topfförmiges Spulengehäuse 22 zur Aufnahme eines Greiferfadenvorrats in Form einer Spule 22a gelagert. Obere Randkonturen einerseits des Spulengehäuses 22 und andererseits der Spule 22a sind in der schematischen Darstellung nach Fig. 2 gestrichelt angedeutet. Der Greiferfaden wird auch als Unterfaden bezeichnet.Below the support plate 14 there is a gripper 19 which has a gripper body 20 with a gripper tip 21. A cup-shaped bobbin housing 22 for receiving a supply of hook thread in the form of a bobbin 22a is mounted in the hook body 20. Upper edge contours on the one hand of the coil housing 22 and on the other hand of the coil 22a are shown in the schematic illustration according to FIG Fig. 2 indicated by dashed lines. The looper thread is also known as the bobbin thread.

Der Greifer 19 ist um eine vertikale, in z-Richtung verlaufende Greiferachse 23 drehbar. Eine Nähbetriebs-Drehrichtung 24 des Greiferkörpers 20 verläuft in Fig. 3 im Uhrzeigersinn um die Greiferachse 23. Der Greiferkörper 20 ist fest mit einer Welle 25 verbunden, die koaxial zur Greiferachse 23 verläuft. Die Welle 25 ist drehbar in einem mit der Grundplatte 2 verschraubten Lagerbock 26 gelagert. In diesem ist eine Antriebswelle 27 gelagert, die mit einem im Inneren des Lagerbocks 26 angeordneten Zahnradgetriebes verbunden ist. Das Zahnradgetriebe weist ein Übersetzungsverhältnis von 1 : 2 auf, so dass sich bei einer Umdrehung der Antriebswelle 27 der auf der Welle 25 befindliche Greiferkörper 20 zweimal dreht. Die Antriebswelle 27 ist über einen Riementrieb 28 antriebsmäßig mit der Armwelle 6 verbunden.The gripper 19 can be rotated about a vertical gripper axis 23 running in the z direction. A sewing operation direction of rotation 24 of the hook body 20 runs in FIG Fig. 3 clockwise around the gripper axis 23. The gripper body 20 is firmly connected to a shaft 25 which runs coaxially to the gripper axis 23. The shaft 25 is rotatably supported in a bearing block 26 screwed to the base plate 2. In this a drive shaft 27 is mounted, which is connected to a gear mechanism arranged in the interior of the bearing block 26. The gear transmission has a transmission ratio of 1: 2, so that with one revolution of the drive shaft 27, the gripper body 20 located on the shaft 25 rotates twice. The drive shaft 27 is drivingly connected to the arm shaft 6 via a belt drive 28.

Zum Abschneiden des Nadelfadens 13 und des Greiferfadens am Nahtende dient ein Fadenziehmesser 29 (vgl. Fig. 3), das beispielsweise aus der EP 1 847 641 B1 bekannt ist.A thread-pulling knife 29 (cf. Fig. 3 ), for example from the EP 1 847 641 B1 is known.

Zum Halten und zum Transport des Nähgutteils 15 weist die Nähmaschine 1 zusätzlich noch einen Drückerfuß 30 und einen oberen Transporteur 31 auf, der mit dem unteren Stoffschieber 17 zum Nähguttransport zusammenwirkt.To hold and transport the workpiece 15, the sewing machine 1 also has a presser foot 30 and an upper conveyor 31, which interacts with the lower material slide 17 for transporting the workpiece.

Die schematische Figur 2 zeigt zudem einen Verlauf des Oberfadens 13 von der Spule 12 bis zum Oberfaden-Anfangsabschnitt 13a. Der Oberfaden 13 wird ausgehend von der Spule 12 über eine Fadenspannungseinrichtung 32 und den Fadenhebel 8 und eine Oberfaden-Führungsklemme 33 hin zur Nadel 10 geführt.The schematic Figure 2 also shows a course of the upper thread 13 from the bobbin 12 to the upper thread starting section 13a. Starting from the bobbin 12, the upper thread 13 is guided to the needle 10 via a thread tensioning device 32 and the thread lever 8 and an upper thread guide clamp 33.

Die Oberfaden-Führungsklemme 33 hat eine Spannscheibe 34, die an einer Führungsstange 35 befestigt ist. Über eine Druckfeder 36 wird die Spannscheibe 34 gegen ein gehäusefestes Widerlager 37 der Oberfaden-Führungsklemme 33 zur Klemmung des Oberfadens 13 gezogen. Am Widerlager 37 ist ein in der Fig. 2 schematisch dargestellter Elektromagnet 38 angebracht, der über eine zentrale Steuereinrichtung 39 der Nähmaschine 1 in nicht näher dargestellter Weise angesteuert wird.The upper thread guide clamp 33 has a tension washer 34 which is attached to a guide rod 35. The tensioning disk 34 is pulled via a compression spring 36 against an abutment 37, which is fixed to the housing, of the upper thread guide clamp 33 in order to clamp the upper thread 13. At the abutment 37 is a in the Fig. 2 attached schematically shown electromagnet 38, which is controlled via a central control device 39 of the sewing machine 1 in a manner not shown.

Anhand der Fig. 3 bis 15 wird nachfolgend eine Ausführung einer Nähmaschinen-Baugruppe 40 zum Erzeugen eines Naht-Anfangsfadens mit einem Soll-Nahtüberstand von höchstens 10 mm beschrieben.Based on Figures 3 to 15 an embodiment of a sewing machine assembly 40 for producing a seam starting thread with a desired seam overhang of at most 10 mm is described below.

Gesehen im Verhältnis zu einer xz-Ebene, in der die Bewegungsachse 11 der Nähnadel 10 liegt, ist die Baugruppe 40 auf einer dem Greifer 19 gegenüberliegenden Seite dieser xz-Ebene angeordnet (vgl. Fig. 1 und 3).Viewed in relation to an xz plane in which the axis of movement 11 of the sewing needle 10 lies, the assembly 40 is arranged on a side of this xz plane opposite the gripper 19 (cf. Fig. 1 and 3 ).

Die Baugruppe 40 hat einen Oberfadenfänger 41 zum Erfassen eines Naht-Anfangsoberfadens zu Beginn einer mit dem Nadelfaden 13 zu nähenden Naht. Der Oberfadenfänger 41 hat ein Oberfadenmesser 42 (vgl. z.B. Fig. 5) mit einem als Durchtrittsöffnung ausgeführten Oberfaden-Erfassungsabschnitt 43. Der Oberfadenfänger 41 hat weiterhin ein Gegenmesser 44, welches mit dem Oberfadenmesser 42 zum Abschneiden des Nadelfadens 13 zusammenwirkt. Das Gegenmesser 44 ist fest zu einem Rahmen der Nähmaschine 1 angeordnet.The assembly 40 has an upper thread catcher 41 for grasping a seam starting upper thread at the beginning of a seam to be sewn with the needle thread 13. The upper thread catcher 41 has an upper thread knife 42 (see. Eg Fig. 5 ) with an upper thread gripping section 43 designed as a passage opening. The upper thread catcher 41 also has a counter knife 44 which cooperates with the upper thread knife 42 to cut the needle thread 13. The counter knife 44 is fixedly arranged in relation to a frame of the sewing machine 1.

Weiterhin hat der Oberfadenfänger 41 eine Oberfadenklemme 45. Letztere ist als U-förmig gestaltete Klemmfeder ausgeführt. Ein Anpressdruck der Klemmfeder 45 gegen das Oberfadenmesser 42 kann über eine Klemmfeder-Stellschraube 46 eingestellt werden. Ein Messerdruck, also ein Anpressdruck des Gegenmessers 44 gegen das Oberfadenmesser 42, kann mittels einer Messer-Stellschraube 47 eingestellt werden.Furthermore, the upper thread catcher 41 has an upper thread clamp 45. The latter is designed as a U-shaped clamping spring. A contact pressure of the clamping spring 45 against the needle thread knife 42 can be set via a clamping spring adjusting screw 46. A knife pressure, that is to say a contact pressure of the counter knife 44 against the upper thread knife 42, can be set by means of a knife adjusting screw 47.

Das Oberfadenmesser 42 mitsamt dem Oberfaden-Erfassungsabschnitt 43 kann mittels eines Verlagerungsantriebs 48 verlagert werden. Der Verlagerungsantrieb 48 ist als pneumatischer Hubzylinder ausgeführt. Eine Verlagerungsbewegung des Oberfaden-Erfassungsabschnitts 43 verläuft längs der y-Richtung, verläuft also linear. Über den Verlagerungsantrieb 48 kann der Oberfaden-Erfassungsabschnitt 43 zwischen drei Stellungen verlagert werden, nämlich zwischen

  • einer Oberfaden-Erfassungsstellung zum Erfassen des Naht-Anfangsoberfadens,
  • einer Oberfaden-Klemmstellung zum Klemmen des Naht-Anfangsoberfadens zwischen dem Oberfadenmesser 42 und der Oberfadenklemme 45 und
  • einer Oberfaden-Schneidstellung zum Abscheren des Naht-Anfangsoberfadens zwischen dem Oberfadenmesser 42 und dem Gegenmesser 44.
The upper thread knife 42 together with the upper thread gripping section 43 can be displaced by means of a displacement drive 48. The displacement drive 48 is designed as a pneumatic lifting cylinder. A displacement movement of the upper thread gripping section 43 runs along the y-direction, that is to say runs linearly. Via the displacement drive 48, the upper thread detection section 43 can be displaced between three positions, namely between
  • an upper thread detection position for detecting the seam start upper thread,
  • an upper thread clamping position for clamping the seam starting upper thread between the upper thread knife 42 and the upper thread clamp 45 and
  • an upper thread cutting position for shearing off the seam starting upper thread between the upper thread knife 42 and the counter knife 44.

Die Oberfaden-Erfassungsstellung ist in den Fig. 4 bis 6 dargestellt. Die Oberfaden-Klemmstellung ist in den Fig. 7 bis 11 dargestellt. Die Oberfaden-Schneidstellung ist in den Fig. 12 bis 15 dargestellt.The upper thread detection position is in the Figures 4 to 6 shown. The upper thread clamping position is in the Figures 7-11 shown. The upper thread cutting position is in the Figures 12 to 15 shown.

Die Oberfaden-Erfassungsstellung, die Oberfaden-Klemmstellung und die Oberfaden-Schneidstellung sind voneinander verschiedene Stellungen des Oberfaden-Erfassungsabschnitts 43. Diese drei Stellungen können mit dem Verlagerungsantrieb 48, also mit genau einem Antrieb, vorgegeben werden.The upper thread gripping position, the upper thread clamping position and the upper thread cutting position are mutually different positions of the upper thread gripping section 43. These three positions can be specified with the displacement drive 48, that is to say with exactly one drive.

Eine Linearführung führt eine Verlagerungsbewegung des Oberfaden-Erfassungsabschnitts 43 zwischen den drei genannten Stellungen. Die Linearführung umfasst einen Führungsstift 49, der in etwa in der z-Richtung verläuft und an einem Verbindungskolben 50 angebracht ist, der zugfest mit einer Kolbenstange 51 des Hubzylinders 48 verbunden ist. Der Führungsstift 49 wirkt zur Führung der Verlagerungsbewegung des Oberfaden-Erfassungsabschnitts 43 mit einem Langloch 52 in einer Montageplatte 53 der Baugruppe 40 zusammen (vgl. z.B. Fig. 4 und 5). An einem der Montageplatte 53 gegenüberliegenden Ende ist am Führungsstift 49 das Oberfadenmesser 42 angebracht.A linear guide guides a displacement movement of the upper thread detection section 43 between the three aforementioned positions. The linear guide comprises a guide pin 49 which runs approximately in the z-direction and is attached to a connecting piston 50 which is connected to a piston rod 51 of the lifting cylinder 48 in a tensile manner. The guide pin 49 interacts with an elongated hole 52 in a mounting plate 53 of the assembly 40 to guide the displacement movement of the upper thread gripping section 43 (cf., for example, FIG Figures 4 and 5 ). At an end opposite the mounting plate 53, the upper thread knife 42 is attached to the guide pin 49.

In der Oberfaden-Erfassungsstellung ist das Oberfadenmesser 42 gegenüber dem Gegenmesser 44 soweit in negativer y-Richtung ausgefahren, dass der Oberfaden-Erfassungsabschnitt 43 vollständig über das Oberfadenmesser 42 und die Oberfadenklemme 45 übersteht und frei zum Durchtritt der Nadel 10 zugänglich ist.In the upper thread detection position, the upper thread knife 42 is extended in the negative y-direction relative to the counter knife 44 so that the upper thread detection section 43 projects completely over the upper thread knife 42 and the upper thread clamp 45 and is freely accessible for the needle 10 to pass through.

Ein einstellbarer Klemmstellungsanschlag dient zur Vorgabe einer Relativposition des Oberfadenmessers 42 zur Oberfadenklemme 45 in der Oberfaden-Klemmstellung. Der Klemmstellungsanschlag beinhaltet einen Gewindestift 54, der in einen Kunststoffkörper 55 eingedreht ist. Hierdurch ist eine selbsthemmende Ausführung des Gewindestifts 54 gegeben. In der Anschlagstellung des Klemmstellungsanschlags, also in der Oberfaden-Klemmstellung nach den Fig. 7 bis 11, schlägt ein freies Ende des Gewindestifts 54 am Führungsstift 49 an und begrenzt somit eine Bewegung des Oberfadenmessers 42, ausgehend von der Oberfaden-Erfassungsstellung in positiver y-Richtung, also beispielsweise in der Fig. 7 nach links. Zur Einstellung einer genauen Position des Oberfaden-Erfassungsabschnitts 43 in der Oberfaden-Klemmstellung wird der Gewindestift 54 entsprechend relativ zum Kunststoffkörper 55 verdreht. Hierzu ist der Gewindestift 54 über eine Durchtrittsöffnung 56 (vgl. Fig. 8) in einer Antriebs-Trägerplatte 57 von außen her zugänglich.An adjustable clamping position stop is used to preset a relative position of the upper thread knife 42 to the upper thread clamp 45 in the upper thread clamping position. The clamping position stop contains a threaded pin 54 which is screwed into a plastic body 55. This results in a self-locking design of the threaded pin 54. In the stop position of the clamping position stop, i.e. in the upper thread clamping position after the Figures 7-11 , strikes a free end of the threaded pin 54 on the guide pin 49 and thus limits a movement of the upper thread knife 42, starting from the upper thread detection position in the positive y-direction, for example in the Fig. 7 to the left. To set an exact position of the upper thread gripping section 43 in the upper thread clamping position, the threaded pin 54 is correspondingly rotated relative to the plastic body 55. For this purpose, the threaded pin 54 is via a passage opening 56 (cf. Fig. 8 ) in a drive support plate 57 accessible from the outside.

Der Klemmstellungsanschlag ist zwischen einer insbesondere in der Fig. 7 gezeigten Anschlagstellung und einer unwirksamen Neutralstellung verlagerbar. Diese Neutralstellung ist beispielsweise in der Figur 12 dargestellt. Zu dieser Verlagerung des Gewindestifts 54 des Klemmstellungsanschlags dient ein Klemmanschlagsantrieb 58, der ebenfalls als pneumatischer Hubzylinder ausgeführt ist. Der Kunststoffkörper 55 ist mit dem Klemmanschlagsantrieb 58 über dessen Kolbenstange 59 verbunden.The clamping position stop is between a particular in the Fig. 7 shown stop position and an ineffective neutral position displaceable. This neutral position is for example in the Figure 12 shown. A clamping stop drive 58, which is also designed as a pneumatic lifting cylinder, is used for this displacement of the threaded pin 54 of the clamping position stop. The plastic body 55 is connected to the clamping stop drive 58 via its piston rod 59.

In der Anschlagstellung des Klemmstellungsanschlags stützt sich der Kunststoffkörper 55 entgegen der Vorspannkraft, die der Führungsstift 49 auf den Gewindestift 54 ausübt, an der Antriebs-Trägerplatte 57 ab (vgl. Fig. 7).In the stop position of the clamping position stop, the plastic body 55 is supported on the drive support plate 57 against the pretensioning force that the guide pin 49 exerts on the threaded pin 54 (cf. Fig. 7 ).

Auch der Klemmanschlagsantrieb 58 ist an der Antriebs-Trägerplatte 57 montiert. Die Antriebs-Trägerplatte 57 ist L-förmig gebogen, wobei der Oberfaden-Erfassungsabschnitt-Verlagerungsantrieb 48 an einem ersten Schenkel und der Klemmanschlagsantrieb 58 an einem zweiten Schenkel dieser L-Form montiert ist. Eine Verlagerungsbewegung durch den Klemmanschlagsantrieb 58 erfolgt in etwa senkrecht zur Verlagerungsbewegung durch den Verlagerungsantrieb 48.The clamping stop drive 58 is also mounted on the drive support plate 57. The drive support plate 57 is bent into an L-shape, the upper thread gripping section displacement drive 48 being mounted on a first leg and the clamping stop drive 58 being mounted on a second leg of this L-shape. A displacement movement by the clamping stop drive 58 takes place approximately perpendicular to the displacement movement by the displacement drive 48.

In der Oberfaden-Klemmstellung wird der Oberfaden zwischen der Oberfadenklemme 45 und dem Oberfadenmesser 42 geklemmt. Diese Klemmstellung ist so, dass eine Schneidkante des Oberfadenmessers 42 noch nicht mit dem Gegenmesser zum Abschneiden des Oberfadens 13 zusammenwirkt.In the upper thread clamping position, the upper thread is clamped between the upper thread clamp 45 and the upper thread knife 42. This clamping position is such that a cutting edge of the upper thread knife 42 does not yet interact with the counter knife for cutting the upper thread 13.

Die Baugruppe 40 hat weiterhin einen einstellbaren Schneidstellungsanschlag zur Vorgabe einer Relativposition des Oberfadenmessers 42 zum Gegenmesser 44 in der Oberfaden-Schneidstellung. Der Schneidstellungsanschlag hat einen Anschlagskörper 60, der durch eine Anschlagsplatte (vgl. die Fig. 12 und 13) gebildet ist. Letztere wirkt in der Schneidanschlagstellung des Schneidstellungsanschlags wiederum mit dem Führungsstift 49 der Baugruppe 40 zusammen. Ein Kontakt zwischen dem Führungsstift 49 und der Anschlagsplatte 60 erfolgt im Bereich eines schrägen Wandabschnitts 61 der Anschlagsplatte 60, also im Bereich eines Kantenabschnitts, der in der Aufsicht nach Fig. 13 einen Winkel zur x-Achse beziehungsweise zur Nährichtung einnimmt.The assembly 40 also has an adjustable cutting position stop for specifying a relative position of the upper thread knife 42 to the counter knife 44 in the upper thread cutting position. The cutting position stop has a stop body 60, which is supported by a stop plate (see Figures 12 and 13 ) is formed. The latter in turn interacts with the guide pin 49 of the assembly 40 in the cutting stop position of the cutting position stop. A contact between the guide pin 49 and the stop plate 60 takes place in the area of an inclined wall section 61 of the stop plate 60, that is to say in the area of a Edge section, which in the plan after Fig. 13 assumes an angle to the x-axis or to the sewing direction.

Zur Einstellung des Schneidstellungsanschlags kann eine Relativposition der Anschlagsplatte 60 zur Montageplatte 53 über eine Montageverbindung vorgegeben werden, die eine Einstellschraube 62 aufweist, die durch ein längs der x-Richtung verlaufendes Langloch 63 in der Anschlagsplatte 60 verläuft (vgl. Fig. 13). Zum Einstellen des Schneidstellungsanschlags wird nach entsprechendem Lösen der Einstellungsschraube 62 die Anschlagsplatte 60 längs der x-Richtung verlagert, so dass ein Kontaktbereich zwischen dem Führungsstift 49 und dem schrägen Wandabschnitt 61 in der Schneidanschlagsstellung entsprechend längs der y-Richtung wandert.To set the cutting position stop, a relative position of the stop plate 60 to the mounting plate 53 can be specified via a mounting connection which has an adjusting screw 62 which runs through an elongated hole 63 in the stop plate 60 running along the x-direction (cf. Fig. 13 ). To set the cutting position stop, after loosening the setting screw 62 accordingly, the stop plate 60 is displaced along the x direction so that a contact area between the guide pin 49 and the inclined wall section 61 in the cutting stop position moves accordingly along the y direction.

Zur Vorgabe einer Relativposition des Oberfadenmessers 42 zum Gegenmesser 44 ist der Anschlagskörper 60 quer zu einer Schneid-Bewegungsrichtung des Oberfadenmessers 42, also quer zur y-Richtung, verlagerbar.To specify a relative position of the upper thread knife 42 to the counter knife 44, the stop body 60 can be displaced transversely to a cutting movement direction of the upper thread knife 42, that is to say transversely to the y direction.

In der Anschlagstellung des Schneidstellungsanschlags (vgl. Fig. 13) stützt sich die Anschlagplatte 60 entgegen der Vorspannkraft durch den Führungsstift 49 an der Antriebs-Trägerplatte 57 ab.In the stop position of the cutting position stop (cf. Fig. 13 ) the stop plate 60 is supported against the pretensioning force by the guide pin 49 on the drive carrier plate 57.

Der Schneidstellungsanschlag wirkt dann, wenn der Klemmstellungsanschlag in die Neutralposition gefahren ist.The cutting position stop acts when the clamping position stop has moved into the neutral position.

Die Baugruppe 40 hat weiterhin eine Absaugeinrichtung 64 zum Absaugen eines mit dem Oberfadenmesser 42 abgeschnittenen Abschnitts des Oberfadens 13. Die Absaugeinrichtung 64 hat ein Absaugrohr 65 mit einem Absaugende, welches unterhalb eines Abschneidebereichs 65a zwischen dem Oberfadenmesser 42 und dem Gegenmesser 44 ausmündet (vgl. Fig. 12). Ein gegenüberliegendes Ende 66 des Absaugrohrs 65 steht mit einer nicht dargestellten Unterdruckquelle der Absaugeinrichtung 64 in Verbindung.The assembly 40 also has a suction device 64 for suctioning off a section of the upper thread 13 that has been cut off with the upper thread knife 42 Upper thread knife 42 and the counter knife 44 opens out (cf. Fig. 12 ). An opposite end 66 of the suction pipe 65 is connected to a vacuum source (not shown) of the suction device 64.

Zum Erzeugen des Naht-Anfangsoberfadens mit dem Soll-Nahtüberstand von höchstens 10mm wird in der Oberfaden-Erfassungsstellung des Oberfaden-Erfassungsabschnitts 43 zunächst ein Abschnitt des Nadelfadens 13 von einer Nähgut-Oberseite her hin zu einer Unterseite des Nähguts 15 transportiert, wobei die Nadel 10 durch die Öffnung des Oberfaden-Erfassungsabschnitts 43 hindurchtritt. Anschließend wird der Oberfaden-Anfangsabschnitt 13a mit dem Greifer 19 ausgezogen, bis der gesamte Oberfaden-Anfangsabschnitt 13a unter der Unterseite des Nähguts 15 liegt. Nach einem ersten kurzen Stich wird dann, wenn der Fadenhebel 8 im Bereich des oberen Todpunkts liegt, der Oberfaden-Erfassungsabschnitt 43 durch Betätigen des Verlagerungsantriebs 48 aus der Oberfaden-Erfassungsstellung in die eingezogene Oberfaden-Klemmstellung verbracht. Bei geklemmtem Oberfaden-Anfangsabschnitt 13a erfolgt dann ein weiterer Kurzstich, wobei die Nähnadel 10 dann nicht mehr durch den Oberfaden-Erfassungsabschnitt 43 hindurchtritt. Nach erfolgtem zweiten Kurzstich wird der Klemmanschlagsantrieb 58 betätigt und der Klemmstellungsanschlag aus der Klemmstellung in die Neutralstellung überführt, so dass nun der Oberfaden-Erfassungsabschnitt 43 und somit das Oberfadenmesser 42 in die weiter eingezogene Oberfaden-Schneidstellung überführt wird. In dieser wirkt eine Schneidkante des Oberfaden-Erfassungsabschnitts 43 mit dem Gegenmesser 44 zum Abschneiden des Oberfaden-Anfangsabschnitts 13a zusammen. Der abgeschnittene Teil des Oberfaden-Anfangsabschnitts 13a wird sodann von der Absaugeinrichtung 64 abgesaugt.In order to generate the seam starting upper thread with the desired seam protrusion of at most 10 mm, a section of the needle thread 13 is first transported from the upper side of the sewing material to a lower side of the sewing material 15 in the upper thread grasping position of the upper thread grasping section 43, the needle 10 passes through the opening of the upper thread engaging portion 43. Then the upper thread starting section 13a is pulled out with the looper 19 until the entire upper thread starting section 13a lies under the underside of the sewing material 15. After a first short stitch, when the thread lever 8 is in the region of the top dead center, the upper thread gripping section 43 is brought out of the upper thread gripping position into the drawn in upper thread clamping position by actuating the displacement drive 48. With the upper thread starting section 13a clamped, a further short stitch is then carried out, the sewing needle 10 then no longer passing through the upper thread gripping section 43. After the second short stitch has taken place, the clamping stop drive 58 is actuated and the clamping position stop is transferred from the clamping position to the neutral position, so that the upper thread gripping section 43 and thus the upper thread knife 42 are now transferred to the further drawn-in upper thread cutting position. In this, a cutting edge of the upper thread gripping section 43 cooperates with the counter knife 44 to cut off the upper thread starting section 13a. The cut part of the upper thread starting section 13a is then sucked off by the suction device 64.

Nach den beiden initialen Kurzstichen am Anfang der Naht wird die Naht dann mit normaler Stichlänge weitergenäht. Eine Stichlängen-Vorgabe erfolgt mit Hilfe der Steuereinrichtung 39.After the two initial short stitches at the beginning of the seam, the seam is then sewn with the normal stitch length. A stitch length is preset with the aid of the control device 39.

Nun kann die weitere Naht unter Beteiligung des Oberfadens 13 und des nicht näher dargestellten Unterfadens als Doppelsteppstichnaht ausgebildet werden. Am Nahtende erfolgt dann ein Fadenabschneidevorgang des Oberfadens 13 und des Unterfadens mit dem Fadenziehmesser 29.Now the further seam with the participation of the upper thread 13 and the lower thread, not shown in detail, can be designed as a lockstitch seam. At the end of the seam, a thread cutting operation of the upper thread 13 and the lower thread with the thread-pulling knife 29 then takes place.

Die Aufsicht nach Fig. 16 zeigt eine mit der Näh-Baugruppe 40 erzeugte Naht 67 in einem Naht-Anfangsabschnitt. Die Nährichtung verläuft längs der x-Richtung in der Fig. 6 nach links. Aufgrund des Oberfadenabschnitts zwischen dem Oberfadenmesser 42 und dem Gegenmesser 44 ist der Oberfaden-Anfangsabschnitt 13a am Anfang der Naht 67 so kurz, dass ein maximaler Nahtüberstand A von 10 mm resultiert.The supervision after Fig. 16 FIG. 10 shows a seam 67 produced with the sewing assembly 40 in a seam starting section. The sewing direction runs along the x-direction in the Fig. 6 to the left. Because of the upper thread section between the upper thread knife 42 and the counter knife 44, the upper thread starting section 13a at the beginning of the seam 67 is so short that a maximum seam protrusion A of 10 mm results.

Dargestellt ist in der Fig. 16 auch, dass die ersten beiden Anfangs-Stiche S1, S2 gegenüber den folgenden Stichen S3, ... Su verkürzt sind.Is shown in the Fig. 16 also that the first two initial stitches S 1 , S 2 are shortened compared to the following stitches S 3 , ... S u.

Alternativ zur vorstehend erläuterten Ausgestaltung des Verlagerungsantriebs 48 mit Anschlägen kann der Verlagerungsantrieb auch als Schrittmotor ausgeführt sein, wobei die verschiedenen Stellungen des Oberfaden-Erfassungsabschnitt 43 dann verschiedenen Schrittpositionen des Schrittmotors entsprechen. Diese verschiedenen Schrittpositionen können über die Steuereinrichtung 39 vorgegeben werden.As an alternative to the above-explained configuration of the displacement drive 48 with stops, the displacement drive can also be designed as a stepping motor, the different positions of the upper thread detection section 43 then corresponding to different stepping positions of the stepping motor. These different step positions can be specified via the control device 39.

Claims (9)

  1. An assembly (40) for generating a seam starting upper thread with a nominal seam protrusion (A) of at most 10mm
    - with an upper thread catcher (41) for taking up the seam starting upper thread, wherein the upper thread catcher (41) comprises:
    - an upper thread blade (42) with an upper thread take-up section (43),
    - a counter blade (44),
    - an upper thread clamp (45),
    - a displacement drive (48) for the upper thread take-up section (43),
    - characterized in that the upper thread take-up section (43) is displaceable by the displacement drive (48) between
    -- an upper thread take-up position for taking up the seam starting upper thread,
    -- an upper thread clamping position for clamping the seam starting upper thread between the upper thread blade (42) and the upper thread clamp (45) and
    -- an upper thread cutting position for shearing the seam starting upper thread between the upper thread blade (42) and the counter blade (44).
  2. An assembly according to claim 1, characterized in that the displacement drive (48) is designed as exactly one drive which displaces the upper thread take-up section (43) between the three positions.
  3. An assembly according to claim 1 or 2, characterized in that the displacement drive (48) is designed as a linear drive, wherein a linear guide (49, 52) guides a displacement movement of the upper thread take-up section (43) between the three positions.
  4. An assembly according to any one of claims 1 to 3, characterized by an adjustable clamping position stop (54, 49) for presetting a relative position of the upper thread blade (42) to the upper thread clamp (45) in the upper thread clamping position.
  5. An assembly according to claim 4, characterized in that the clamping position stop (54, 49) has a self-locking threaded pin (54).
  6. An assembly according to any one of claims 1 to 5, characterized by an adjustable cutting position stop (60, 49) for presetting a relative position of the upper thread blade (42) to the counter blade (44) in the upper thread cutting position.
  7. An assembly according to claim 6, characterized in that the cutting position stop (60, 49) has a stop body (60) which is displaceable transversely to a cutting movement direction of the upper thread blade (42) for presetting a relative position of the upper thread blade (42) to the counter blade (44).
  8. An assembly according to any one of claims 1 to 7, characterized by a suction device (64) for sucking off a cut-off upper thread section.
  9. A sewing machine comprising an assembly (40) according to any one of claims 1 to 8,
    - with a driven needle bar (9) with a sewing needle (10) carried thereby for guiding the upper thread (13) and
    - with a shuttle (19) for gripping the upper thread (13) for stitch formation.
EP18167987.9A 2017-05-05 2018-04-18 Assembly and sewing machine for producing a starting upper thread with a set protrusion Active EP3399088B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017207627.5A DE102017207627A1 (en) 2017-05-05 2017-05-05 Assembly for creating a seam beginning upper thread with a desired seam projection

Publications (2)

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EP3399088A1 EP3399088A1 (en) 2018-11-07
EP3399088B1 true EP3399088B1 (en) 2021-10-20

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KR (1) KR102496909B1 (en)
CN (1) CN108796855B (en)
DE (1) DE102017207627A1 (en)
TW (1) TWI788349B (en)

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DE202019102567U1 (en) * 2019-05-08 2020-08-11 Dürkopp Adler AG Sewing machine and counter-knife assembly for one machine

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TWI788349B (en) 2023-01-01
KR20180122949A (en) 2018-11-14
KR102496909B1 (en) 2023-02-06
DE102017207627A1 (en) 2018-11-08
EP3399088A1 (en) 2018-11-07
CN108796855B (en) 2022-05-10
CN108796855A (en) 2018-11-13
TW201843370A (en) 2018-12-16

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