EP3176296B1 - Method for creating an initial upper thread of a seam with short seam width - Google Patents
Method for creating an initial upper thread of a seam with short seam width Download PDFInfo
- Publication number
- EP3176296B1 EP3176296B1 EP16197995.0A EP16197995A EP3176296B1 EP 3176296 B1 EP3176296 B1 EP 3176296B1 EP 16197995 A EP16197995 A EP 16197995A EP 3176296 B1 EP3176296 B1 EP 3176296B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- upper thread
- seam
- thread
- initial section
- catcher
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000000034 method Methods 0.000 title claims description 19
- 238000009958 sewing Methods 0.000 claims description 54
- 239000004744 fabric Substances 0.000 claims description 14
- 238000005520 cutting process Methods 0.000 claims description 13
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000009966 trimming Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000004826 seaming Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Images
Classifications
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B59/00—Applications of bobbin-winding or -changing devices; Indicating or control devices associated therewith
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B49/00—Take-up devices, e.g. levers, for the needle thread
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B47/00—Needle-thread tensioning devices; Applications of tensometers
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B57/00—Loop takers, e.g. loopers
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B57/00—Loop takers, e.g. loopers
- D05B57/08—Loop takers, e.g. loopers for lock-stitch sewing machines
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B65/00—Devices for severing the needle or lower thread
Definitions
- the invention relates to a method for producing a seam beginning upper thread with a desired seam projection of at most 10 mm.
- 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 36 04 299 A1 discloses a method for drawing a free thread end of a needle thread from an upper side of a sewing material on its underside and a device for carrying out the method.
- the US 2005/0178307 A1 discloses a multi-needle embroidery machine.
- the DE-PS 80 842 describes a lockstitch gripper sewing machine with free-running gripper.
- the DE 197 466 53 C1 describes a method for shortening a fabric-side looper thread end in sewing machines with thread cutting device.
- the EP 1 847 642 A1 describes a lockstitch sewing machine.
- the EP 2 453 050 A1 describes a sewing machine and a method for sewing a seam beginning with such a sewing machine.
- the EP 2 692 925 A1 describes a thread-pulling knife for a sewing machine, a thread trimming assembly and a sewing machine with such a thread-pulling knife.
- the top thread starting section at the beginning of the seam production not only by the fabric down, as for example from the DE 102 34 251 C1
- the generated Target seam projection can not exceed 9 mm, can not exceed 8 mm, can not exceed 7 mm and can be even smaller.
- a cutting of the upper thread starting section according to claim 2 generates the low target seam projection immediately.
- the upper thread catcher clamp may be located adjacent to the upper thread catcher.
- the upper thread catcher on the one hand and the gripper on the other hand are different sewing machine components.
- the upper thread catcher clamp can be formed by its own clamping unit, in which the upper thread starting section is controlled by means of the upper thread catcher.
- Such a clamping unit may be formed directly on the upper thread catcher.
- the clamp can be formed by two components already present in the sewing machine, between which the upper thread starting section is selectively introduced after being grasped by the upper thread catcher. These clamping components can be on the one hand a bobbin thread and on the other hand a bobbin case.
- a length specification of the upper thread starting section via an upper thread guide clamp according to claim 4 prevents the upper thread starting section from becoming undesirably too long.
- the upper thread guide clamp can ensure that the upper thread upper section is actually pulled out by the gripper and that no upper thread from a top thread run between the sewing needle and an upper thread supply is retightened.
- An adjustment of a Oberfadenauszugs or a Oberfaden arrangement according to claim 6 via a thread tensioning device provides for an adjustable specification of an upper thread guide and processing, which can be used, for example, to adapt to different fabric qualities and / or different yarn qualities.
- An adjustment of the thread tensioning device may be dependent on the design or the effect of a needle thread catcher clamp. In this way, an interaction of the thread tensioning device can be optimized with the upper thread catcher clamp.
- the advantages of such an assembly correspond to those already discussed above with reference to the production method of the invention.
- the gripper and the upper thread catcher can be one and the same component.
- the gripper and the upper thread catcher may also be formed by separate components.
- the assembly may include an upper thread knife for cutting off the detected upper thread starting portion.
- an upper thread knife allows a safe cutting of the detected upper thread starting portion.
- the upper thread cutter may be a machine component formed as a separate component from another thread-pulling knife for thread cutting at the seam end.
- the upper thread knife can also be designed as a thread-pulling knife for thread trimming at the seam end.
- the subassembly may have a suture feed dog, the top thread catcher being mounted on a carrier for the suture feed dog.
- Such an assembly of the upper thread catcher and in particular of the upper thread diameter ensures that the upper thread starting section can be guided independently of a movement of the conveyor and in particular short cut.
- the assembly may include an upper thread catcher clamp for clamping the detected upper thread starting portion.
- the advantages of such an upper thread catcher clamp correspond to those already associated with the catcher clamping step of the production process were explained.
- the upper thread catcher clamp may be located adjacent to the upper thread catcher. In this case, the upper thread catcher clamp can also be mounted on a carrier for a material feed dog.
- the upper thread catcher clamp may be formed by the cooperation of a spool and a bobbin case of the sewing machine.
- the upper thread catcher clamp may be located adjacent to the upper thread catcher. Such an arrangement of the upper thread catcher clamp facilitates controlled guidance of the upper thread starting section.
- the assembly may include an upper thread guide clamp for specifying a length of the upper thread starting portion located in the upper thread course in front of the sewing needle.
- the upper thread guide clamp and / or the thread tensioning device can be avoided in particular that the extended upper thread starting section gets so long that it undergoes a knotting with the lower thread when undressing.
- the module may have a suction device for sucking off the cut upper thread section.
- a suction device for sucking off the cut upper thread section.
- a lockstitch sewing machine 1 has a base plate 2 with an upwardly extending therefrom the stand 3 and an angled arm 4. The latter ends in a head 5.
- an arm shaft 6 is rotatably mounted.
- This drives in the head 5 a crank mechanism 7 with a thread lever 8 at.
- the crank mechanism 7 is drivingly connected to a needle bar 9 mounted axially displaceably in the head 5. This has at its lower end a needle 10.
- the needle 10 is moved up and down by the crank mechanism 7 on a vertical axis 11.
- a Cartesian xyz coordinate system is used below.
- the vertical axis 11 extends along the z-direction of this coordinate system.
- the x-direction is perpendicular to the plane of the Fig. 1 into it 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 leads in an eye of a coil 12 via a thread tensioning device and the thread lever 8 supplied needle thread 13, which is also referred to as needle thread.
- the needle thread 13 has a free upper thread starting section 13a.
- the base plate 2 carries a screw-mounted support plate 14, on which a workpiece 15 rests.
- the support plate 14 is provided with a recess formed for the passage of a lower feed dog 17.
- the latter has a tap hole 18 for the passage of the needle 10.
- the feed dog 17 is in a known manner in drive connection with a arranged below the base plate 2 thrust and screw jack.
- a gripper 19 having a gripper body 20 with a gripper tip 21.
- a cup-shaped coil housing 22 for receiving a looper thread supply in the form of a coil 22a is mounted in the gripper body 20 in the gripper body 20, a cup-shaped coil housing 22 for receiving a looper thread supply in the form of a coil 22a is mounted in the gripper body 20, a cup-shaped coil housing 22 for receiving a looper thread supply in the form of a coil 22a is mounted.
- Upper edge contours on the one hand of the coil housing 22 and on the other hand of the coil 22a are in the schematic representation after Fig. 2 indicated by dashed lines.
- the looper thread is also called bobbin thread.
- the gripper 19 is rotatable about a vertical, in the z-direction gripper axis 23.
- a sewing operation direction of rotation 24 of the gripper body 20 extends in Fig. 3 clockwise about the gripper axis 23.
- the gripper body 20 is fixedly connected to a shaft 25 which is coaxial with the gripper axis 23.
- the shaft 25 is rotatably mounted in a bearing block 26 screwed to the base plate 2.
- a drive shaft 27 is mounted, which is connected to a arranged in the interior of the bearing block 26 gear transmission.
- the gear transmission has a gear ratio of 1: 2, so that in one revolution of the drive shaft 27 located on the shaft 25 gripper body 20 rotates twice.
- the drive shaft 27 is drivingly connected to the arm shaft 6 via a belt drive 28.
- a thread-pulling knife 29 for example, from the EP 1 847 641 B1 is known.
- the sewing machine 1 For holding and transporting the workpiece part 15, the sewing machine 1 additionally has a presser foot 30 and an upper feed dog 31, which cooperates with the lower feed dog 17 for the material to be transported.
- the schematic FIG. 2 also shows a course of the upper thread 13 from the spool 12 to the upper thread starting portion 13 a.
- the upper thread 13 is guided starting from the spool 12 via a thread tensioning device 32 and the thread lever 8 and an upper thread guide clamp 33 toward the needle 10.
- the upper thread guide clamp 33 has a tension pulley 34 which is fixed to a guide rod 35. Via a compression spring 36, the clamping plate 34 is pulled against a housing-fixed abutment 37 of the upper thread guide clamp 33 for clamping the upper thread 13.
- abutment 37 At the abutment 37 is an in the Fig. 2 schematically illustrated solenoid 38 attached, which is controlled via a central control device 39 of the sewing machine 1 in a manner not shown.
- This sewing machine assembly has a top thread catcher 40 for detecting the upper thread 13.
- the upper thread catcher 40 has at its free end a catch eyelet 41 (see also Fig. 5 ), which also serves as a movable upper thread knife.
- the free end of the upper thread catcher 40 extends in the in the Fig. 3 shown starting position under the lower feed dog 17, wherein the catch eyelet 41 is aligned with the stitch hole 18.
- the upper thread catcher 40 has an L-shaped bent base body 42 and is mounted on a pivot bearing 43.
- the pivot bearing 43 may be fixed to the housing or may alternatively be firmly connected to a feed dog carrier 44 of the lower feed dog 17.
- the base body 42 of the upper thread catcher 40 By means of the pivot bearing 43, the base body 42 of the upper thread catcher 40 about a pivot axis 45 between the starting position to Fig. 3 and a cutoff end position.
- Fig. 5 shows an intermediate position of the body 42 between the starting position and the cutting end position.
- the pivot axis 45 is parallel to the z-direction.
- the upper thread catcher 40 is actuated by a pneumatic drive, which is not shown in the drawing and which engages an actuating eye 46 in the base body 42, which is spaced from the pivot axis 45 in the base body 42 executed.
- the Fig. 3 shows the stitch forming tools of the sewing machine 1 in a loop stroke position.
- the sewing needle 10 has left its bottom dead center and is displaced upward again in the direction of the positive z-axis so far that a needle thread loop 47 has formed.
- the hook tip 21 engages in the instantaneous position Fig. 3 on.
- the upper thread catcher 40 is in the starting position, wherein the upper thread loop 47 has formed below the catching eye 41 of the upper thread catcher 40.
- the upper thread loop 47 represents an upper thread section, which is transported with the sewing needle 10 through the workpiece 15 from the upper side to the lower side thereof.
- the catch lug 41 is arranged at a very short distance below the lower feed dog 17. This distance is less than 1 mm.
- the Fig. 2 shows a momentary position of the gripper circulation shortly after the position Fig. 3 ,
- Fig. 4 shows the current position of the stitch forming tools after a gripper cycle of more than 180 ° compared to Fig. 3 ,
- the hook tip 21 has pulled the top thread starting portion 13a through the fabric part 15 completely down in this cycle.
- the upper thread starting section 13a has also the stitch hole 18 and the catch eyelet 41 to pass down.
- the upper thread 13 extends between the hook tip 21 and the needle hole 18 above the gripper 19 and below the thread pulling knife 29 and passes from below to the fabric initially the catch eyelet 41 and then the stitch hole 18 in the lower feed dog 17.
- the upper thread starting portion 13a with the gripper 19 so pulled out until the entire upper thread-starting portion 13a is below the fabric underside.
- the upper thread catcher clamp 33 is closed, so that no upper thread 13 can be tightened from the upper thread supply in the upper thread run before the upper thread catcher clamp 33.
- the upper thread guide clamp 33 opens.
- Fig. 5 shows an intermediate position of the main body 42 of the upper thread catcher 40 between the starting position after the Fig. 3 and 4 and the cut-off end position immediately before the cutting of the upper thread starting portion 13a.
- the upper thread catcher 40 grasps the upper thread 13 via the catch lug 41 for shortening the upper thread starting section 13a.
- a peripheral edge of the catch 41 acts as a needle thread knife with a housing-fixed counter blade 48 of the assembly for cutting the upper thread 13 together.
- the needle 10 has left the stitch hole 18 upwards.
- the upper thread 13 is shortened defined.
- a free end of the upper thread starting portion 13a is provided on the workpiece 15 at the seam beginning with a length of at most 10 mm.
- This residual length of the upper thread starting portion 13a may be smaller than 10 mm and may be 9 mm, 8 mm or even 7 mm and may be even smaller.
- the cutting of the upper thread 13 with the upper thread knife 41 on the counter knife 48 is the end result of guiding the detected upper thread starting portion 13a with the upper thread catcher 40, and presents processing of the upper thread starting portion 13a such that the desired seam projection of the upper thread starting portion 13a is at most 10 mm results.
- Fig. 6 shows the with the sewing assembly after the Fig. 3 to 5 created seam 48a in a seam beginning section.
- the sewing direction runs along the x-direction in the Fig. 6 , to the left. Due to the upper thread portion between the upper thread knife 41 and the counter knife 48, the upper thread starting portion 13a at the beginning of the seam 48a is so short that a maximum seam protrusion A of 10 mm results.
- the module after Fig. 7 has in addition to the one after the Fig. 1 to 5 one in the Fig. 6 shown lifting device 49.
- the lifting device 49 may be designed as a pneumatic cylinder.
- the lifting device 49 can be controlled via the central control device 39.
- the lifting device 49 is disposed between a bottom of the bobbin case 22 and a lower bottom wall of the bobbin 22a.
- About the lifting device 49 can be a stroke displacement of the coil 22a relative to the coil housing 22 along a displacement path 50 reach, in the Fig. 2 is indicated.
- a cover wall 51 of the coil 22a projects beyond one of these facing coil receptacles 52 in an upper side of the coil housing 22 by more than 0.5 mm, for example by more than 1 mm.
- the assembly works Fig. 7 as follows: With regard to the formation of the needle thread loop 47 and the detection of this with the hook tip 21, the assembly operates after Fig. 7 first, as above in connection with the Fig. 1 to 3 described.
- the lifting device 49 When reaching the current position accordingly Fig. 3 the lifting device 49 is actuated, so that the coil 22a projects beyond the upper edge of the coil housing 22.
- the hook tip 21 then pulls out the upper thread 13 and pulls the upper thread starting portion 13 a through the workpiece 15 down according to what above in connection with the execution of the Fig. 1 to 5 was explained.
- the upper thread starting section 13a comes over the bobbin case 22 due to the projection of the lid wall 51 of the bobbin 22a lie between this top wall 51 and the coil housing 22, as in the Fig. 7 shown. In one section, the upper thread 13 is then inside the spool 22a.
- the lifting device 49 In the instantaneous position of the hook tip 21 after Fig. 7 or in a circulating position of the hook point 21 which is still advanced by about 45 °, the lifting device 49 is transferred to its starting position, so that the coil 22a is lowered again into its normal position in the coil housing 22.
- the upper thread starting section 13a is then clamped between the spool 22a and the spool housing 22. Through the coil 22a and the coil housing 22, a needle thread catcher clamp is then formed.
- the upper thread starting portion 13a is progressively pulled out as the seam progresses from the upper thread catcher clamp 22a, 22, wherein the upper thread starting portion 13a as well as that of the Nähgutteil 15 through the stitch hole 18th
- the upper thread section which has been guided directly from above, is looped around by the lower thread and knotted during seaming.
- the free beginning of the upper thread starting section 13a may then have a length in the region of the length of a stitch. If the stitch length is set to at most 10 mm, the desired target seam projection of at most 10 mm may result from the upper thread starting portion 13a.
- Fig. 8 shows a seam 48b, which with the sewing assembly after Fig. 7 is produced.
- the upper thread starting section 13a is not at the seam beginning of the seam 48b away at the seam 48b, but only between the stitches S i and Si + i. How big i is depends on the length of the upper thread starting portion 13a pulled out from the fabric part 15, which is gradually pulled out of the nip between the bobbin 22a and the bobbin case 22 during sewing. i can be in the range between 4 and 10, for example. Even at the seam 48b, the seam projection A of the upper thread starting portion 13a is at most 10 mm.
- the upper thread guide clamp 33 can be omitted.
- a desired ratio of a length dimension of the upper thread 13 drawn from the upper thread starting portion 13a and one of the upper thread running becomes when the upper thread starting portion 13a is extended and / or guided before the sewing needle 10 pulled length measure of the upper thread 13 results.
- the more the thread tension is adjusted the larger the proportion of the length dimension drawn from the upper thread starting section 13a in comparison with the length dimension of the upper thread 13 provided by the thread tensioning device 32.
- the sewing assembly can also have one in the Fig. 5 schematically indicated suction device 53 for sucking off the cut with the upper thread cutter 41 upper thread portion.
- the suction device 53 is arranged adjacent to the cutting edge of the counter blade 48.
- the suction device 53 is connected to a vacuum source.
- the upper thread catcher 40 with the catch eyelet 41 can in a further variant of a sewing assembly for producing a seam beginning upper thread with a nominal seam projection of at most 10 mm even without a counter knife are used.
- the upper thread catcher 40 then cooperates with an upper thread catcher clamp in the manner of the above-described clamping between the coil 22a and the coil housing 22 together.
- This upper thread catcher clamp may be disposed adjacent to the upper thread catcher 40.
- the upper thread starting portion 13a is not cut off but sewed in a controlled manner with the seam starting portion sewn, as described above in connection with FIGS. 7 and 8 already explained.
- this sewing operation it can be achieved by synchronously moving the catching eyelet 41 for seaming in the +/- y direction that the upper thread starting section 13a is gradually pulled out of the upper thread catcher clip to the right (-y direction) and to the left ( + y-direction) is placed in the stitch hole so that it is always placed under the respective stitch and sewn under.
- the side of the stitch hole 18, over which the upper thread starting section 13a is guided during sewing of the initial seam section can be designed to be straight, ie not curved his.
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- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Description
Die Erfindung betrifft ein Verfahren zum Erzeugen eines Naht-Anfangsoberfadens mit einem Soll-Nahtüberstand von höchstens 10 mm. Nähmaschinen sind bekannt aus der
Die
Es ist eine Aufgabe der vorliegenden Erfindung, ein Verfahren anzugeben, mit dem ein Naht-Anfangsoberfaden mit dem gewünschten, kurzen Soll-Nahtüberstand erreicht wird. Mit einem solchen Verfahren soll erreicht werden, dass mit größtmöglicher Sicherheit vermieden ist, dass ein Anfangsfaden von der Sichtseite eines vernähten Nähgutteils her über einen Rand des Nähgutteils überstehend sichtbar ist.It is an object of the present invention to provide a method by which a suture top thread is achieved with the desired, short target seam overhang. With such a procedure should be achieved be that with the greatest possible certainty is avoided that a starting thread from the visible side of a sewn workpiece material forth over an edge of the workpiece is protruding visible.
Die Aufgabe ist erfindungsgemäß gelöst durch ein Verfahren mit den im Anspruch 1 angegebenen Merkmalen.The object is achieved by a method having the features specified in
Erfindungsgemäß wurde erkannt, dass es möglich ist, den Oberfaden-Anfangsabschnitt zu Beginn der Nahterzeugung nicht nur durch das Nähgut nach unten zu ziehen, wie dies beispielsweise aus der
Ein Abschneiden des Oberfaden-Anfangsabschnitts nach Anspruch 2 erzeugt den geringen Soll-Nahtüberstand unmittelbar.A cutting of the upper thread starting section according to
Ein Klemmen des erfassten Oberfaden-Anfangsabschnitts nach Anspruch 3 gewährleistet, dass ein an sich längerer Oberfaden-Anfangsabschnitt beim Durchführen der ersten Stiche am Anfang der zu erzeugenden Naht kontrolliert längs der Naht positioniert wird, wobei dann ein Anfang des Oberfaden-Anfangsabschnitts mit einer maximalen Länge von einer Stichlänge über die Naht übersteht. Soweit in diesem Naht-Anfangsabschnitt eine Stichlänge von höchstens 10 mm gewährleistet ist, führt dies automatisch zum Erreichen des gewünschten, geringen Soll-Nahtüberstandes des Oberfadens. Die Oberfaden-Fängerklemme kann benachbart zum Oberfadenfänger angeordnet sein. Der Oberfadenfänger einerseits und der Greifer andererseits sind verschiedene Nähmaschinen-Komponenten. Die Oberfaden-Fängerklemme kann durch eine eigene Klemmeinheit gebildet werden, in die der Oberfaden-Anfangsabschnitt mit Hilfe des Oberfadenfängers kontrolliert überführt wird. Eine derartige Klemmeinheit kann direkt am Oberfadenfänger ausgebildet sein. Alternativ hierzu kann die Klemme durch zwei bei der Nähmaschine ohnehin vorhandene Bauteile gebildet werden, zwischen die der Oberfaden-Anfangsabschnitt nach dem Erfassen durch den Oberfadenfänger gezielt eingeführt wird. Bei diesen Klemm-Bauteilen kann es sich einerseits um eine Unterfaden-Spule und andererseits um ein Unterfaden-Spulengehäuse handeln.Clamping of the detected upper thread starting portion according to
Eine Längenvorgabe des Oberfaden-Anfangsabschnitts über eine Oberfaden-Führungsklemme nach Anspruch 4 verhindert, dass der Oberfaden-Anfangsabschnitt unerwünscht zu lang gerät. Die Oberfaden-Führungsklemme kann zudem dafür sorgen, dass durch den Greifer tatsächlich der Oberfaden-Anfangsabschnitt ausgezogen wird und nicht Oberfaden aus einem Oberfadenlauf zwischen der Nähnadel und einem Oberfadenvorrat nachgezogen wird.A length specification of the upper thread starting section via an upper thread guide clamp according to
Eine geringere Anfangs-Stichlänge nach Anspruch 5, zum Beispiel ein kurzer Anfangsstich, zwei kurze Anfangsstiche oder drei kurze Anfangsstiche, vermeidet, dass der Oberfaden-Anfangsabschnitt beim Führen und Bearbeiten unerwünscht mit dem Transporteur mitgenommen wird, was unerwünscht dazu führen würde, dass der Oberfaden zwischen dem Nähgut und dem Austritt aus dem Stichloch einen verlängerten Weg hat.A lower initial stitch length according to claim 5, for example a short initial stitch, two short initial stitches or three short initial stitches, avoids that the upper thread starting portion is undesirably entrained with the feed dog during guiding and processing, which would undesirably lead to the upper thread between the fabric and the exit from the stitch hole has an extended path.
Eine Einstellung eines Oberfadenauszugs bzw. einer Oberfadenführung nach Anspruch 6 über eine Fadenspannungseinrichtung sorgt für eine einstellbare Vorgabe einer Oberfadenführung und -bearbeitung, was zum Beispiel zur Anpassung an verschiedene Stoffqualitäten und/oder verschiedene Fadenqualitäten genutzt werden kann. Eine Einstellung der Fadenspannungseinrichtung kann abhängig von der Ausführung bzw. der Wirkung einer Oberfaden-Fängerklemme sein. Auf diese Weise kann ein Zusammenwirken der Fadenspannungseinrichtung mit der Oberfaden-Fängerklemme optimiert werden.An adjustment of a Oberfadenauszugs or a Oberfadenführung according to claim 6 via a thread tensioning device provides for an adjustable specification of an upper thread guide and processing, which can be used, for example, to adapt to different fabric qualities and / or different yarn qualities. An adjustment of the thread tensioning device may be dependent on the design or the effect of a needle thread catcher clamp. In this way, an interaction of the thread tensioning device can be optimized with the upper thread catcher clamp.
Zur Durchführung des Verfahrens kann eine Baugruppe dienen
- mit einer angetriebenen Nadelstange mit einer hiervon getragenen Nähnadel zur Führung eines Oberfadens,
- mit einem Greifer,
- mit einem Oberfadenfänger zum Erfassen des Oberfadens.
- with a driven needle bar with a sewing needle carried therefrom for guiding an upper thread,
- with a gripper,
- with a top thread catcher for grasping the upper thread.
Die Vorteile einer derartigen Baugruppe entsprechen denjenigen, die vorstehend unter Bezugnahme auf das erfindungsgemäße Erzeugungsverfahren bereits diskutiert wurden. Der Greifer und der Oberfadenfänger können ein und dieselbe Komponente sein. Alternativ können der Greifer und der Oberfadenfänger auch durch voneinander separate Komponenten gebildet sein.The advantages of such an assembly correspond to those already discussed above with reference to the production method of the invention. The gripper and the upper thread catcher can be one and the same component. Alternatively, the gripper and the upper thread catcher may also be formed by separate components.
Die Baugruppe kann ein Oberfadenmesser zum Abschneiden des erfassten Oberfaden-Anfangsabschnitts aufweisen. Ein derartiges Oberfadenmesser ermöglicht ein sicheres Abschneiden des erfassten Oberfaden-Anfangsabschnitts. Das Oberfadenmesser kann eine Maschinenkomponente sein, die als von einem weiteren Fadenziehmesser zum Fadenabschneiden am Nahtende separate Komponente gebildet ist. Alternativ kann das Oberfadenmesser gleichzeitig als Fadenziehmesser zum Fadenabschneiden am Nahtende ausgeführt sein.The assembly may include an upper thread knife for cutting off the detected upper thread starting portion. Such an upper thread knife allows a safe cutting of the detected upper thread starting portion. The upper thread cutter may be a machine component formed as a separate component from another thread-pulling knife for thread cutting at the seam end. Alternatively, the upper thread knife can also be designed as a thread-pulling knife for thread trimming at the seam end.
Die Baugruppe kann einen Nähgut-Transporteur aufweisen, wobei der Oberfadenfänger an einen Träger für den Nähgut-Transporteur montiert ist. Eine derartige Montage des Oberfadenfängers und insbesondere des Oberfadenmessers sorgt dafür, dass der Oberfaden-Anfangsabschnitt unabhängig von einer Bewegung des Transporteurs geführt und insbesondere kurz abgeschnitten werden kann.The subassembly may have a suture feed dog, the top thread catcher being mounted on a carrier for the suture feed dog. Such an assembly of the upper thread catcher and in particular of the upper thread diameter ensures that the upper thread starting section can be guided independently of a movement of the conveyor and in particular short cut.
Die Baugruppe kann eine Oberfaden-Fängerklemme zum Klemmen des erfassten Oberfaden-Anfangsabschnitts aufweisen. Die Vorteile einer derartigen Oberfaden-Fängerklemme entsprechen denjenigen, die im Zusammenhang mit dem Fängerklemmschritt des Erzeugungsverfahrens bereits erläutert wurden. Die Oberfaden-Fängerklemme kann benachbart zum Oberfadenfänger angeordnet sein. In diesem Fall kann die Oberfaden-Fängerklemme ebenfalls an einem Träger für einen Nähgut-Transporteur montiert sein. Die Oberfaden-Fängerklemme kann gebildet sein durch das Zusammenwirken einer Spule und eines Spulengehäuses der Nähmaschine.The assembly may include an upper thread catcher clamp for clamping the detected upper thread starting portion. The advantages of such an upper thread catcher clamp correspond to those already associated with the catcher clamping step of the production process were explained. The upper thread catcher clamp may be located adjacent to the upper thread catcher. In this case, the upper thread catcher clamp can also be mounted on a carrier for a material feed dog. The upper thread catcher clamp may be formed by the cooperation of a spool and a bobbin case of the sewing machine.
Die Oberfaden-Fängerklemme kann benachbart zum Oberfadenfänger angeordnet sein. Eine derartige Anordnung der Oberfaden-Fängerklemme vereinfacht eine kontrollierte Führung des Oberfaden-Anfangsabschnitts.The upper thread catcher clamp may be located adjacent to the upper thread catcher. Such an arrangement of the upper thread catcher clamp facilitates controlled guidance of the upper thread starting section.
Die Baugruppe kann eine Oberfaden-Führungsklemme zur Vorgabe einer Länge des Oberfaden-Anfangabschnitts aufweisen, die sich im Oberfadenlauf vor der Nähnadel befindet. Die Vorteile einer derartigen Oberfaden-Fängerklemme entsprechen denjenigen, die vorstehend mit dem Führungsklemmschritt beim Erzeugungsverfahren bereits erläutert wurden.The assembly may include an upper thread guide clamp for specifying a length of the upper thread starting portion located in the upper thread course in front of the sewing needle. The advantages of such an upper thread catcher clamp correspond to those which have already been explained above with the guide clamping step in the production process.
Entsprechendes gilt für eine einstellbare Fadenspannungseinrichtung im Oberfadenlauf vor der Nähnadel.The same applies to an adjustable thread tensioning device in the upper thread running in front of the sewing needle.
Durch eine entsprechende Vorgabe durch die Oberfaden-Führungsklemme und/oder die Fadenspannungseinrichtung kann insbesondere vermieden werden, dass der ausgezogene Oberfaden-Anfangsabschnitt so lang gerät, dass dieser beim Ausziehen eine Verknotung mit dem Unterfaden erfährt.By an appropriate specification by the upper thread guide clamp and / or the thread tensioning device can be avoided in particular that the extended upper thread starting section gets so long that it undergoes a knotting with the lower thread when undressing.
Die Baugruppe kann eine Absaufeinrichtung zum Absaugen des abgeschnittenen Oberfadenabschnitts aufweisen. Eine derartige Absaugeinrichtung vermeidet, dass sich unerwünscht abgeschnittene Fadenreste im Bereich der Nähmaschine ansammeln.The module may have a suction device for sucking off the cut upper thread section. Such a suction device avoids that undesirable cut thread remnants accumulate in the sewing machine.
Die Vorteile einer Nähmaschine mit einer derartigen Baugruppe entsprechen denjenigen, die vorstehend unter Bezugnahme auf das Erzeugungsverfahren und die Näh-Baugruppe bereits erläutert wurden.The advantages of a sewing machine having such an assembly correspond to those already explained above with reference to the production method and the sewing assembly.
Ausführungsbeispiele der Erfindung werden nachfolgend anhand der Zeichnung näher erläutert. In dieser zeigen:
- Fig. 1
- eine Vorderansicht einer Doppelsteppstichnähmaschine, wobei Details der Erfindung nicht dargestellt sind;
- Fig. 2
- eine perspektivische schematische Darstellung eines Stichbildungsbereiches der Nähmaschine, wobei Details der Erfindung nicht dargestellt sind;
- Fig. 3
- eine Draufsicht auf einen Ausschnitt der Nähmaschine in vergrößertem Maßstab entsprechend dem Sichtpfeil III in
Fig. 1 , wobei die Stichbildungswerkzeuge in einer Schleifenhubstellung beim Erfassen einer Oberfadenschleife durch eine Greiferspitze gezeigt sind; - Fig. 4
- in einer zu
Fig. 3 ähnlichen Darstellung die Stichbildungswerkzeuge in einer der Stellung nachFig. 3 nachfolgenden Momentanposition, bei der die Greiferspitze einen freien Oberfadenanfang aus dem Nähgut vollständig herausgezogen hat; - Fig. 5
- in einer zur
Fig. 3 ähnlichen Darstellung eine auf die Stellung nachFig. 4 folgende Momentanposition, bei der das freie Ende des Oberfadens durch Zusammenwirken eines Oberfadenfängers mit einem Oberfaden-Gegenmesser abgeschnitten wird; - Fig. 6
- schematisch eine Aufsicht auf eine mit der der NähBaugruppe nach den
Fig. 3 bis 5 genähte Naht zur Veranschaulichung eines erzeugten Naht-Anfangsoberfadens mit einem vorgegebenen Soll-Nahtüberstand; - Fig. 7
- in einer zu den
Fig. 3 bis 5 ähnlichen Darstellung eine weitere, nicht erfindungsgemäße Ausführung zum kontrollierten Führen eines erfassten Oberfaden-Anfangsabschnitts, bei dem dieser Oberfaden-Anfangsabschnitt zwischen einem Spulendeckel einer Unterfadenspule und einem Spulengehäuse geklemmt wird; und - Fig. 8
- schematisch eine Aufsicht auf eine mit der der Näh-Baugruppe nach
Fig. 7 genähte Naht zur Veranschaulichung eines erzeugten Naht-Anfangsoberfadens mit einem vorgegebenen Soll-Nahtüberstand.
- Fig. 1
- a front view of a lockstitch sewing machine, details of the invention are not shown;
- Fig. 2
- a perspective schematic representation of a stitch formation region of the sewing machine, with details of the invention are not shown;
- Fig. 3
- a plan view of a section of the sewing machine in an enlarged scale corresponding to the viewing arrow III in
Fig. 1 wherein the stitch forming tools are shown in a loop stroke position in detecting a needle thread loop by a hook tip; - Fig. 4
- in one too
Fig. 3 similar representation the stitching tools in one of the positionFig. 3 subsequent instantaneous position in which the hook tip has completely pulled out a free upper thread from the sewing material; - Fig. 5
- in a to
Fig. 3 similar representation one in the positionFig. 4 the following instantaneous position, in which the free end of the upper thread is cut off by the interaction of a top thread catcher with an upper thread counter knife; - Fig. 6
- schematically a plan view of one with the NähBaugruppe after the
Fig. 3 to 5 stitched seam to illustrate a generated suture start upper thread with a predetermined target seam projection; - Fig. 7
- in one of the
Fig. 3 to 5 similar illustration of another, non-inventive embodiment for controlled guiding a detected upper thread starting portion, in which this upper thread starting portion is clamped between a bobbin lid of a bobbin and a bobbin case; and - Fig. 8
- schematically a plan view of one with the sewing assembly according to
Fig. 7 stitched seam to illustrate a generated seam beginning upper thread with a predetermined target seam projection.
Eine Doppelsteppstichnähmaschine 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
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
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
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
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
Der Greifer 19 ist um eine vertikale, in z-Richtung verlaufende Greiferachse 23 drehbar. Eine Nähbetriebs-Drehrichtung 24 des Greiferkörpers 20 verläuft in
Zum Abschneiden des Nadelfadens 13 und des Greiferfadens am Nahtende dient ein Fadenziehmesser 29, das beispielsweise aus der
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.For holding and transporting the
Die schematische
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
Anhand der
Diese Nähmaschinen-Baugruppe hat einen Oberfadenfänger 40 zum Erfassen des Oberfadens 13. Der Oberfadenfänger 40 hat an seinem freien Ende eine Fangöse 41 (vgl. auch
Anhand der
Die
Die Fangöse 41 ist in sehr geringem Abstand unterhalb des unteren Stoffschiebers 17 angeordnet. Dieser Abstand ist kleiner als 1 mm.The
Der freie Oberfaden-Anfangsabschnitt 13a ragt in dieser Momentanstellung nach
Die
Während des Ausziehens des Oberfaden-Anfangsabschnitts 13a durch die Greiferspitze 21 ist die Oberfaden-Fängerklemme 33 geschlossen, sodass kein Oberfaden 13 aus dem Oberfadenvorrat im Oberfadenlauf vor der Oberfaden-Fängerklemme 33 nachgezogen werden kann. Nach dem Ausziehen des Oberfaden-Anfangsabschnitts 13a durch die Greiferspitze 21 öffnet die Oberfaden-Führungsklemme 33.During the extraction of the upper
Als Resultat dieses Abschneidevorgangs ist der Oberfaden 13 definiert gekürzt. Ein freies Ende des Oberfaden-Anfangsabschnitts 13a liegt auf dem Nähgutteil 15 am Nahtanfang mit einer Länge vor, die höchstens 10 mm beträgt. Diese Restlänge des Oberfaden-Anfangsabschnitts 13a kann kleiner sein als 10 mm und kann 9 mm, 8 mm oder auch 7 mm betragen und kann auch noch kleiner sein.As a result of this clipping process, the
Das Abschneiden des Oberfadens 13 mit dem Oberfadenmesser 41 am Gegenmesser 48 ist das Endresultat eines Führens des erfassten Oberfaden-Anfangsabschnitts 13a mit dem Oberfadenfänger 40 und stellt ein Bearbeiten des Oberfaden-Anfangsabschnitts 13a so dar, dass der gewünschte Nahtüberstand des Oberfaden-Anfangsabschnitts 13a von höchstens 10 mm resultiert.The cutting of the
Nun kann die Naht unter Beteiligung des Oberfadens 13 und des in den
Mit Hilfe der Steuereinrichtung 39 kann eine Stichlänge während des Annähvorgangs und insbesondere während des Abschneidens des Oberfaden-Anfangsabschnitts 13a gemäß der Sequenz in den
Die Aufsicht nach
Dargestellt ist in der
Anhand der
Die Baugruppe nach
Zum kontrollierten Führen und Bearbeiten des mit der Greiferspitze 21, die den Oberfadenfänger darstellt, erfassten Oberfaden-Anfangsabschnitts 13a, sodass der gewünschte Soll-Nahtüberstand von höchstens 10 mm resultiert, arbeitet die Baugruppe nach
Hinsichtlich der Ausbildung der Oberfadenschlinge 47 und der Erfassung von dieser mit der Greiferspitze 21 arbeitet die Baugruppe nach
With regard to the formation of the
Bei Erreichen der Momentanposition entsprechend
In der Momentanposition der Greiferspitze 21 nach
Wenn in der Folge der Momentanposition nach
Bei einer Variante der Näh-Baugruppe kann die Oberfaden-Führungsklemme 33 entfallen. Durch Einstellen einer Fadenspannung, die über die Fadenspannungseinrichtung 32 auf den Oberfaden 13 ausgeübt wird, wird dann beim Ausziehen und/oder beim Führen des Oberfaden-Anfangsabschnitts 13a ein gewünschtes Verhältnis aus einem vom Oberfaden-Anfangsabschnitt 13a hergezogenen Längenmaß des Oberfadens 13 und einem vom Oberfadenlauf vor der Nähnadel 10 hergezogenen Längenmaß des Oberfadens 13 resultiert. Je stärker die Fadenspannung eingestellt wird, desto größer ist der Anteil des vom Oberfaden-Anfangsabschnitts 13a hergezogenen Längenmaßes im Vergleich zum von der Fadenspannungseinrichtung 32 zur Verfügung gestellten Längenmaß des Oberfadens 13.In a variant of the sewing assembly, the upper
Die Näh-Baugruppe kann zusätzlich noch eine in der
Der Oberfadenfänger 40 mit der Fangöse 41 kann bei einer weiteren Variante einer Näh-Baugruppe zum Erzeugen eines Naht-Anfangsoberfadens mit einem Soll-Nahtüberstand von höchstens 10 mm auch ohne ein Gegenmesser zum Einsatz kommen. Der Oberfadenfänger 40 arbeitet dann mit einer Oberfaden-Fängerklemme nach Art der vorstehend beschriebenen Klemmung zwischen Spule 22a und Spulengehäuse 22 zusammen. Diese Oberfaden-Fängerklemme kann benachbart zum Oberfadenfänger 40 angeordnet sein.The
Bei dieser Variante der Näh-Baugruppe wird der Oberfaden-Anfangsabschnitt 13a nicht abgeschnitten, sondern kontrolliert geführt mit dem Naht-Anfangsabschnitt vernäht, wie vorstehend im Zusammenhang mit den
Claims (6)
- Method of creating a seam initial upper thread with a nominal excess seam length (A) of at most 10 mm, the method comprising the following steps:- moving an upper thread section (47) by means of a sewing needle (10) through a piece of fabric (15) from a fabric upper side to a fabric lower side,- drawing out an upper thread initial section (13a) by means of a looper (19) until the entire upper thread initial section (13a) is disposed below the fabric lower side,- grasping the upper thread initial section (13a) by means of an upper thread catcher (40),- guiding the upper thread initial section (13a) by means of the upper thread catcher (40) and processing the upper thread initial section (13a) in such a way that the excess seam length (A) is obtained,- wherein the upper thread catcher (40) on the one hand and the looper (19) on the other are configured as different components of a sewing machine.
- Method as claimed in claim 1, characterized by a cutting off of the grasped upper thread initial section (13a) by means of an upper thread cutter (41) to create the excess seam length (A).
- Method as claimed in claim 1, characterized by a clamping of the grasped upper thread initial section (13a) by means of an upper thread catcher clamp (22a, 22) to create the excess seam length (A).
- Method as claimed in any one of claims 1 to 3, characterized in that a length of the upper thread initial section (13a) is predefined by an upper thread guide clamp (33) disposed in the upper thread path in front of the sewing needle (10).
- Method as claimed in any one of claims 1 to 4, characterized in that after being fed through the piece of fabric (15), the upper thread initial section (13a) is guided through a stitch hole (18) of a fabric feed dog (17), wherein said creation process is carried out with an initial stitch length (S1, S2) that is smaller than a regular stitch length (S3) during seam formation.
- Method as claimed in any one of claims 1 to 5, characterized by a setting of a thread tensioning device (32) in the upper thread path in front of the sewing needle (10) such that when drawing out and/or when guiding the upper thread initial section (13a), a desired relationship of- a linear dimension of the upper thread (13) drawn from the upper thread initial section (13a) and- a linear dimension of the upper thread (13) drawn from the upper thread path in front of the sewing needle (10)is obtained.
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DE102015223194.1A DE102015223194B3 (en) | 2015-11-24 | 2015-11-24 | A method for creating a seam beginning upper thread with short target seam projection and assembly for performing the method |
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DE102017207627A1 (en) * | 2017-05-05 | 2018-11-08 | Dürkopp Adler AG | Assembly for creating a seam beginning upper thread with a desired seam projection |
DE102017207626A1 (en) * | 2017-05-05 | 2018-11-08 | Dürkopp Adler AG | Method for producing a seam end lower thread with a predetermined desired seam protrusion |
CN109402885A (en) * | 2018-11-28 | 2019-03-01 | 杰克缝纫机股份有限公司 | The Yarn taking-up mechanism and sewing machine of use in sewing machine |
CN109457409A (en) * | 2018-11-28 | 2019-03-12 | 杰克缝纫机股份有限公司 | The Yarn taking-up mechanism and sewing machine of use in sewing machine |
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DE19746653C1 (en) * | 1997-10-22 | 1998-11-12 | Pfaff Ag G M | Sewing machine thread cutting |
JP2002113278A (en) * | 2000-10-10 | 2002-04-16 | Juki Corp | Thread-breaking device of sewing machine |
DE10123075C1 (en) * | 2001-05-11 | 2002-10-10 | Duerkopp Adler Ag | Thread cutter, at a double lockstitch sewing machine, has a thread drawing blade positioned very close to the fabric support surface, to leave a very short cut end when the thread is severed |
US7143705B2 (en) * | 2002-03-06 | 2006-12-05 | L & P Property Management Company | Multiple horizontal needle quilting machine and method |
JP4037151B2 (en) * | 2002-04-10 | 2008-01-23 | Juki株式会社 | Upper thread holding device for sewing machine |
DE10234251C1 (en) * | 2002-07-27 | 2003-10-09 | Duerkopp Adler Ag | Sewing machine stitching mechanism relaxes the pressure on the fabric by the presser foot, when the upper thread is clamped between the needle and thread lever on the first seam stitch, for an extended duration with a thicker fabric |
DE102006019193A1 (en) * | 2006-04-21 | 2007-10-25 | Dürkopp Adler AG | Lockstitch sewing machine |
DE202006009410U1 (en) * | 2006-04-21 | 2007-08-30 | Dürkopp Adler AG | Thread-pulling knife for a sewing machine |
EP2360305B1 (en) * | 2010-02-17 | 2013-05-08 | Nähmaschinenfabrik Emil Stutznäcker GmbH & Co. KG | Method for operating a sewing machine and sewing machine |
DE102010043906A1 (en) * | 2010-11-15 | 2012-05-16 | Dürkopp Adler AG | Sewing machine and method for sewing a seam beginning with such a sewing machine |
JP5885018B2 (en) * | 2011-09-13 | 2016-03-15 | ヤマトミシン製造株式会社 | Fraying prevention method for double chain stitch seams and fraying prevention device for double chain stitch sewing machine |
DE102012213599A1 (en) * | 2012-08-01 | 2014-02-06 | Dürkopp Adler AG | Thread-pulling knife for a sewing machine, thread trimming assembly and sewing machine with such a thread-pulling knife |
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