EP2508665B1 - Method for cutting the lower thread and at least one upper thread and method for beginning sewing and a device for performing the method - Google Patents
Method for cutting the lower thread and at least one upper thread and method for beginning sewing and a device for performing the method Download PDFInfo
- Publication number
- EP2508665B1 EP2508665B1 EP12405005.5A EP12405005A EP2508665B1 EP 2508665 B1 EP2508665 B1 EP 2508665B1 EP 12405005 A EP12405005 A EP 12405005A EP 2508665 B1 EP2508665 B1 EP 2508665B1
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- European Patent Office
- Prior art keywords
- thread
- catcher
- needle
- sewing
- unit
- Prior art date
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- 238000009958 sewing Methods 0.000 title claims description 26
- 238000000034 method Methods 0.000 title claims description 17
- 239000000463 material Substances 0.000 claims description 5
- 238000013459 approach Methods 0.000 claims 1
- 239000004744 fabric Substances 0.000 description 20
- 238000009956 embroidering Methods 0.000 description 12
- 206010003402 Arthropod sting Diseases 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Images
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
Definitions
- the invention relates to a method for cutting the lower and at least one upper thread at the end of a sewing or embroidery process according to the preamble of patent claim 1 and an apparatus for performing the method according to claims 1 and 2 according to claim 3.
- the research report discloses a cutting device for cutting the lower and upper threads at the end of a sewing or embroidering operation ( US 4,365,568 ).
- the upper thread and the lower thread are caught with hooks at the ends of sliding sheets.
- the hooks are arranged in pairs and with a fixed blade in between.
- Upper thread and lower thread can each be caught and cut individually.
- a circulation of the gripper with adjacent lower and upper threads There is no indication to be found in this document that the threads are caught by a thread catcher and fed to a thread depot. Further, nothing is to be seen that the threads are held by a thread clamping plate before cutting to cut them stress-free and also the upper and lower thread are not cut simultaneously by a single cutting member.
- a cutting device for cutting a lower and upper thread at the end of a sewing or embroidering operation is known.
- the upper thread and the lower thread are caught with hooks at the ends of sliding sheets.
- the hooks are arranged in pairs and with a fixed blade in between.
- Upper thread and bobbin thread can be individually caught and cut.
- no CB-gripper with intersecting threads is described, but a rotation of the gripper with adjacent lower and upper threads. It is in this document neither an indication to find that the threads are caught by a thread catcher and fed to a thread depot, nor that the threads are held before cutting through a thread clamping plate to cut it stress-free. The upper and lower thread are thus not cut simultaneously by a single cutting member.
- An object of the present invention is to provide a method and apparatus for a sewing machine with a CB-gripper-type or a CB-gripper, which allow, at the end of a sewing or embroidery process, the upper and lower threads of the desired length to cut and to provide the loose ends of the upper and lower thread on the machine in an optimal position for embroidering or sewing. Another allows a rich knot in the fabric.
- the drive of the unit is done by engaging it on the main drive train by a solenoid that acts as an actuator.
- a positively driven cam mechanism provides the required kinematics.
- the distinction whether the thread trimming function or the Anstickfunktion is to be performed, is done only on the harmonic wave-dependent energization of a solenoid at the respective predetermined rotation angle of the main shaft.
- the inventive method allows thread cutting and embroidering with CB gripper systems and rotary gripper systems.
- the activation mechanism for carrying out the thread cutting and Anstickfunktionen has a very simple structure and includes a plurality of superimposed sheets with different configurations and specific functions for the ends.
- Some of these sheets are moved forward and backward together by a linear-acting drive and get to the thread ends in a to bring optimal position, depending on the feed position in engagement with additional stationarily arranged sheets with suitable recesses for temporary deflection and / or clamping of the threads.
- the drive of the activation mechanism can be triggered directly via the harmonic and carried out with a cam mechanism on the main shaft synchronous to the rotation angle of the two shafts. Alternatively, the drive could be performed by servo or stepper motors.
- FIG. 1 is a gripper and reference numeral 3 denotes a stitch plate. Between the gripper 1 and the needle plate 3 is a thread cutting and Anstickech 5 can be seen.
- the thread cutting unit 5 comprises a plurality of superimposed, partly synchronously displaceable with each other and partly fixed, movable sheets, which act as a thread catcher and Fadenaus- and thread deflector (in FIG. 10 in Exploded view). The description or functions of the individual sheets takes place partly in the individual method steps, shown in the following figures.
- FIG. 1 the basic position of the thread cutting unit 5 can be seen and none of the sheets is engaged with one of the threads (upper thread 7 or lower thread 9).
- the execution of the last stitch at the end of a sewing or stitching seam is determined by the FIGS. 1 to 14 described. It is assumed that the upper thread 7 and the lower thread 9 substantially in the in FIG. 1 lying position and form a seam. At the beginning of the last stitch at a 220 ° harmonic angle, the last stitch begins and the needle 11 keeps the upper thread taut between the stitch hole 13 in a substantially rectilinear manner; The lower thread 9 extends from its exit from the bobbin case 15 substantially straight to the stitch hole 13. Now begins a synchronous displacement of the three Fadenfticianbleche, short upper, middle and lower thread catcher 19a, 19b and 19c, a yarn tensioning plate 31 and a clamping plate 61.
- the lower thread 9 is dropped from the control edges 17a, 17b and slides into a thread depot 21 in a stationary Fadenleitblech 33rd
- a harmonic angle of 320 ° the tip of the needle 11 has crossed the needle plate 3 and after another 50 °, the hook tip 23 has detected the upper thread loop 25 and the upper thread 7 deflected to the left between the needle hole 13 and the hook tip 23 ( Fig. 5 ).
- the needle 7 has already left the needle plate 3 back up and the needle thread loop 25 is further spread by the edges 17e and 17d of the thread catcher 19a and 19b.
- the upper thread loop 25 is almost completely spread.
- the needle thread 7a is caught by the edge 17c.
- the upper and the middle thread catcher 19a and 19b draw the lower thread 9 between the stitch hole 13 and the thread depot 21 to the left so that it runs approximately in the direction of the needle 11 between the stitch hole 13 and the thread catcher 19a ( FIG. 7 ).
- the upper thread loop 25 has exceeded the lower vertex of the gripper 1 and is in the discharge position.
- the lower thread 9 will continue from the retracted thread catchers 19a, 19b further deflected to the left and now runs above the upper thread catcher 19a at an acute angle to the tap hole 13.
- the needle thread 7a is braked or decoupled ( Fig.
- the thread catcher 19 After a further rotation of the harmonic to 185 ° angle, the thread catcher 19 have reached their starting position. The upper thread 7 is pulled out of the thread catchers 19 by the thread lever (not shown). The lower thread 9 is now in a defined position C ( FIG. 12 ) and on the yarn guide plate 33 and is held there in position. At a harmonic angle of 220 °, the cycle is completed. The presser foot (not shown) is raised and the fabric (not shown) can be removed. The upper thread 7 and the lower thread 9 are separated from the fabric and pulled forward to the required length ( FIG. 14 ).
- the upper thread 7 and the lower thread 9 are no longer stretched from the needle 11 to the embroidery hole 13 or from the bobbin case 15 to the stitch hole 13.
- the at least one upper thread 7 is Loose and the lower thread 9 is positioned by the thread cutting unit 5. You are now in an optimal starting position for embroidering or sewing on a new seam.
- both the upper thread 7 and the lower thread 9 at the end of a sewing or stitching seam are in an optimal position for the embroidering by the thread cutting and embroidering unit 5 (see. FIG. 15 ), there is a new embroidering or sewing at the harmonic angle of 220 °.
- a loop 63 is formed in the lower thread 9, which extends from the exit of the lower thread 9 from the bobbin case 15 to the right and from there back towards the stitch hole 13.
- the loop 63 is now positioned, but not held. After the puncture of the needle in the fabric at a harmonic angle 30 °, the gripper 1 has detected the needle thread loop; the loop 63 of the lower thread 9 has not been changed.
- FIG. 17 At a harmonic angle of 60 ° ( FIG. 17 ), the upper thread loop is guided counterclockwise to the left around the gripper 1 and the thread cutting and embroidering unit 5 moves to the right after a predetermined movement, driven by the main shaft or by a motor. After another 20 ° rotation of the harmonic ( FIG. 18 ), the loose fabric thread 7b of the upper thread 7 are detected by cuts 45 and the needle thread 7a of the upper thread 7 of corresponding exceptions or incisions on the thread catchers 19a, 19b, 19c, wherein the free end of the fabric thread 7b is pulled under the throat plate 3.
- FIG. 19 now shows the fabric thread below the stitch plate 3 and in enlarged Presentation in FIG.
- FIGS. 33a and 33b in turn, essentially show the thread cutting unit 5, as already in FIG.
- FIGS. 33c, d and e is shown enlarged, as the thread passes into the thread depot 21.
- Reference numeral 45a denotes a thread contour on the thread catcher 19a and the contour 45b on the thread catcher 19b are in FIG. 33 not active.
- the thread is guided by the two V-shaped contours 47a and 47b at the front ends of the thread catcher 19a and 19b over the contour 47c on the thread catcher 19c into the thread depot 21.
- the two-armed wiper lever 51 carries on the first of its arms a parallel to the axis of rotation of the wiper lever 51 lying bolt 53, which is pushed by the lower thread catcher 19c (contour 17f) to the side.
- the cut thread ends are pushed to the side and are then in optimal Ansticklage or Annählage.
- FIGS. 33a and 33b are again the mutual arrangements of the thread catcher 19a-19c and the spring plate 31 with respect to the fixed thread wiper unit 37 in the rest position visible.
- FIG. 33b are the Thread catcher 19a-19c and the spring plate 31 and the yarn guide plate 33, which are mutually connected to each other, moved to the right and overlap with the thread wiper unit 37 significantly more.
- the positions of the thread are visible during the different phases.
- FIG. 34 are reproduced in an exploded view parts of the thread cutting unit 5 for better understanding.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Description
Gegenstand der Erfindung ist ein Verfahren zum Schneiden des Unter- und mindestens eines Oberfadens am Ende eines Näh- oder Stickvorgangs gemäss Oberbegriff des Patentanspruchs 1 sowie eine Vorrichtung zur Durchführung der Verfahren nach den Patentansprüchen 1 und 2 gemäss Patentanspruch 3.The invention relates to a method for cutting the lower and at least one upper thread at the end of a sewing or embroidery process according to the preamble of
Ein einwandfreies Beginnen einer Näh- oder Sticknaht setzt stets voraus, dass der Ober- und der Unterfaden eine geeignete Länge und wenn möglich Lage bezüglich des Näh- oder Stickguts aufweisen. Diese Voraussetzung liegt meist jedoch nicht vor, wenn ein Näh- oder Stickvorgang in der üblichen Weise beendet wird. Liegen die Fäden nicht in definierter guter Lage, so wird kein optimaler erster Stich, bzw. erster Knoten erreicht. Dies kann zu Problemen bei der Weiterverarbeitung des Näh- oder Stickguts führen und ist insbesondere aus ästhetischer und funktioneller Sicht nicht erwünscht.A perfect start of sewing or stitching always requires that the upper and lower thread have a suitable length and, if possible, a position relative to the sewing or embroidery material. However, this condition is usually not present when a sewing or embroidery process is terminated in the usual way. If the threads are not in a defined good position, then no optimal first stitch, or first node is achieved. This can lead to problems in the further processing of the sewing or embroidery material and is not desirable in particular from an aesthetic and functional point of view.
Aus dem Recherchenbericht ist eine Schneidvorrichtung zum Schneiden des Unter- und Oberfadens am Ende eines Näh- oder Stickvorgangs bekannt (
Aus der
Eine Aufgabe der vorliegenden Erfindung besteht nun darin, für eine Nähmaschine mit einem CB-greiferartigen oder einem CB-Greifer ein Verfahren und eine Vorrichtung zu schaffen, welche es erlauben, am Ende eines Näh- oder Stickvorgangs den Ober- und den Unterfaden in gewünschter Länge abzuschneiden und die losen Enden des Ober- und des Unterfadens an der Maschine in optimaler Lage für das Ansticken, bzw. Annähen bereitzustellen. Eine weitere ermöglicht einen satten Knoten im Stoff. Der Antrieb des Aggregats erfolgt durch Einkuppeln desselben am Hauptantriebsstrang durch einen Hubmagneten, der als Stellglied fungiert. Ein zwangsgeführtes Kurvengetriebe stellt die erforderliche Kinematik zur Verfügung. Die Unterscheidung, ob die Fadenschneidfunktion oder die Anstickfunktion ausgeführt werden soll, geschieht einzig über die oberwellenabhängige Bestromung eines Hubmagneten bei dem jeweilig vorgegebenen Drehwinkel der Hauptwelle. In vorteilhafter Weise gelingt es, die Schnittgeschwindigkeit zu erhöhen oder die Schnittzeit zu reduzieren und eine hohe Anstickqualität zu erlangen. Es kann das Risiko des Verklemmens des Faden in der Greiferbahn minimiert werden. Auch ist eine seitliche Verstellung der Nadel für, bzw. bei der Fadenschneidfunktion nicht notwendig. Im Weiteren erlaubt das erfindungsgemässe Verfahren das Fadenschneiden und Ansticken mit CB-Greifersystemen sowie Rundlauf-Greifersystemen.
Die Aktivierungsmechanik für die Durchführung der Fadenschneid- und Anstickfunktionen weist einen sehr einfachen Aufbau auf und umfasst eine Mehrzahl übereinanderliegender Bleche mit unterschiedlichen Ausbildungen und für die Funktionen spezifisch ausgebildeten Enden. Einige dieser Bleche werden von einem linear wirkenden Antrieb gemeinsam vor- und rückwärts verschoben und gelangen, um die Fadenenden in eine optimale Lage zu bringen, je nach Vorschubposition in Eingriff mit zusätzlichen stationär angeordneten Blechen mit geeigneten Ausnehmungen zum zeitweiligen Auslenken und/oder Klemmen der Fäden. Der Antrieb der Aktivierungsmechanik kann direkt über die Oberwelle ausgelöst und mit einer Kurvenmechanik auf der Hauptwelle synchron zum Drehwinkel der beiden Wellen erfolgen. Alternativ könnte der Antrieb durch Servo- oder Schrittmotoren durchgeführt werden.An object of the present invention is to provide a method and apparatus for a sewing machine with a CB-gripper-type or a CB-gripper, which allow, at the end of a sewing or embroidery process, the upper and lower threads of the desired length to cut and to provide the loose ends of the upper and lower thread on the machine in an optimal position for embroidering or sewing. Another allows a rich knot in the fabric. The drive of the unit is done by engaging it on the main drive train by a solenoid that acts as an actuator. A positively driven cam mechanism provides the required kinematics. The distinction whether the thread trimming function or the Anstickfunktion is to be performed, is done only on the harmonic wave-dependent energization of a solenoid at the respective predetermined rotation angle of the main shaft. Advantageously, it is possible to increase the cutting speed or reduce the cutting time and obtain a high Anstickqualität. The risk of jamming of the thread in the hook path can be minimized. Also, a lateral adjustment of the needle for, or at the thread cutting function is not necessary. Furthermore, the inventive method allows thread cutting and embroidering with CB gripper systems and rotary gripper systems.
The activation mechanism for carrying out the thread cutting and Anstickfunktionen has a very simple structure and includes a plurality of superimposed sheets with different configurations and specific functions for the ends. Some of these sheets are moved forward and backward together by a linear-acting drive and get to the thread ends in a to bring optimal position, depending on the feed position in engagement with additional stationarily arranged sheets with suitable recesses for temporary deflection and / or clamping of the threads. The drive of the activation mechanism can be triggered directly via the harmonic and carried out with a cam mechanism on the main shaft synchronous to the rotation angle of the two shafts. Alternatively, the drive could be performed by servo or stepper motors.
Anhand illustrierter Ausführungsbeispiele wird die Erfindung näher erläutert. Es zeigen
Figur 1- Eine perspektivische ausschnittsweise Darstellung der Stichplatte und dem darunter liegenden Greifer sowie eine Fadenschneid- und Anstickmechanik am Beginn des ersten Stiches, Oberwellenposition 220°,
- Figur 2
- eine Anordnung wie in
nach einer Oberwellendrehung von 50°, ein Fadenfänger beginnt sich in X-Richtung zu bewegen und erfasst den Unterfaden mit einer Unterfadenfangkante,Figur 1 Figur 3- eine Darstellung bei einem Drehwinkel von 290°; der Unterfaden ist von der Unterfadenkante abgeworfen und in einem Fadendepot gehalten; die Nadel sticht in den Stoff ein,
- Figur 4
- die Situation bei 320°, der Fadenfänger erreicht seine Endlage, der Unterfaden ist maximal ausgelenkt,
Figur 5- Situation nach einer Drehung von 190° bei 50°, die Greiferspitze erfasst den Oberfaden,
- Figur 6
- der Nadelfaden und der Stofffaden werden aufgespreizt (80°),
Figur 7- Situation bei 110°, der Nadel- und Stofffaden sind maximal gespreizt, der Fadenfänger beginnt sich in X-Richtung zu bewegen,
- Figur 8
- Situation bei 140°, der Fadenfänger erfasst den Nadel- und den Stofffaden mit separaten Fangkonturen,
Figur 9- Situation bei 175°, der Nadelfaden ist vom Fadenhebel auf die erforderliche Länge vorgezogen und der Oberfaden und der Unterfaden liegen in der Position kurz vor deren Durchtrennung,
- Figur 10
- eine perspektivische Darstellung der Freischneidanordnung, umfassend mehrere übereinanderliegende und gegenseitig verschiebbare Bleche,
Figur 11- eine vergrösserte perspektivische Darstellung der Trennvorrichtung in
Figur 10 im Trennmoment (abgebildet ist der Unterfaden), - Figur 12
- wie
, unmittelbar nach dem Trennen,Figur 11 Figur 13- eine Situation bei 185°, der Fadenfänger erreicht seine Ausgangsstellung, der Oberfaden wird durch den Fadenhebel aus der Fadenfängermechanik gezogen, der Unterfaden liegt in definierter Lage auf dem Fadenleitblech und wird dort in Position gehalten,
- Figur 14
- eine Situation bei 220°, der erste Zyklus ist abgeschlossen, der mindestens eine Ober- und der Unterfaden ist getrennt und auf die erforderliche Länge vorgezogen, bereit für das Annähen oder das Ansticken, die Maschine stoppt, ein neues Werkstück kann eingelegt werden,
Figur 15- die Maschine beginnt den ersten Stich zu generieren bei Oberwellenwinkel 220°,
- Figur 16
- Situation bei 30°, Oberfaden-Schlinge wurde erstellt und der Greifer erfasst die Oberfadenschlinge,
- Figur 17
- Situation bei 60°, der Fadenfänger beginnt sich nach rechts zu verschieben,
- Figur 18
- Situation bei 80°, vom Oberfadenschlauf werden der Stofffaden sowie der Nadelfaden in entsprechend angeordneten Ausnahmen am Fadenfänger erfasst,
Figur 19- Situation bei 90°, der Stofffaden ist vom Fadenfänger unter die Stichplatte gezogen worden,
Figur 20- einen vergrösserten Ausschnitt in
,Figur 19 Figur 21- Situation bei 95°, das Fadenbremsblech wird durch die Fadenfängermechanik an der markierten Stelle A geöffnet und der Fadenwischer wird durch den mittleren Fadenfänger betätigt,
- Figur 22
- Situation bei 100°, das Fadenbremsblech schliesst sich für einen kurzen Augenblick (die Fäden liegen analog zu Anordnung in
Figur 21 ), Figur 23- Situation bei 120°, der Fadenhebel erreicht die Endstellung und zieht den vorhandenen Faden durch das geöffnete reibungsarme Fadenbremsblech auf die gewünschte Länge aus, der erste Stich ist beendet,
- Figur 24
- Situation bei 240°, der zweite Stich beginnt und das Fadenbremsblech schliesst sich für einen kurzen Augenblick und fungiert als temporäre Fadenbremse, die mit erhöhter Kraft belastet ist,
Figur 25- Situation bei 255°, der Fadenfänger wird in die Ausgangsstellung zurückgefahren und der Oberfaden wird nun vom Fadenbremsblech mit definierter Haltekraft zurückgehalten, es entsteht ein satter Knoten und der Fadenwischer wischt den mindestens einen Oberfaden und den Unterfaden in eine definierte Lage,
- Figur 26
- Situation bei 265°, entspricht vergrösserter Darstellung eines Ausschnitts in
,Figur 25 - Figur 27
- Situation bei 30°, der zweite Stich wird generiert,
- Figur 28
- Situation bei 50°, der Greifer zieht den Fadenschlauf von der Nadel weg,
Figur 29- Situation bei 150°, der Fadenhebel zieht den Oberfaden zurück,
- Figur 30
- Situation bei 170°, der Nadelfaden liegt knapp unter der Stichplatte,
Figur 31- Situation bei 190°, der Unterfaden wird vom Oberfaden erfasst und der Fadenhebel zieht den Knoten an die Stoffunterseite und
Figur 32- Situation bei 220°, der Fadenhebel hat den Oberfadenschlauf mit dem erfassten Unterfaden an die Stoffunterseite gezogen und ein satter Knoten ist vollendet,
- Figur 33a
- eine vergrösserte Darstellung der Fadenschneid- und Anstickeinheit in der Ausgangsstellung,
- Figur 33b
- eine vergrösserte Darstellung der Fadenschneid- und Anstickeinheit in der Ausgangsstellung, jedoch in der Endstellung,
- Figur 33c
- eine Detailansicht der Fadenschneideinheit von oben nach dem Fangen des Oberfadens,
- Figur 33d
- die Fadenschneideinheit nach einem weiteren Schritt,
- Figur 33e
- die Fadenschneideinheit nach einem weiteren Schritt, Faden in Fadendepot,
- Figur 34
- eine Explosionsdarstellung der Fadenschneid- und Anstickvorrichtung,
- Figur 34a
- je eine Situation der Fadenlage,
- Figur 35
- eine perspektivische Darstellung der Fadenwischer- und Fadenbremseinheit.
- FIG. 1
- A perspective partial view of the needle plate and the underlying gripper and a thread cutting and Anstickmechanik at the beginning of the first stitch, harmonic position 220 °,
- FIG. 2
- an arrangement as in
FIG. 1 after a harmonic rotation of 50 °, a thread catcher begins to move in the X direction and detects the lower thread with a lower thread catching edge, - FIG. 3
- a representation at a rotation angle of 290 °; the lower thread is dropped from the lower thread edge and in one Thread store held; the needle pierces the fabric,
- FIG. 4
- the situation at 320 °, the thread catcher reaches its end position, the bobbin thread is maximally deflected,
- FIG. 5
- Situation after a rotation of 190 ° at 50 °, the hook tip grasps the upper thread,
- FIG. 6
- the needle thread and the fabric thread are spread open (80 °),
- FIG. 7
- Situation at 110 °, the needle and fabric threads are maximally spread, the thread catcher begins to move in the X-direction,
- FIG. 8
- Situation at 140 °, the thread catcher detects the needle and the fabric thread with separate catch contours,
- FIG. 9
- Situation at 175 °, the needle thread is pulled from the thread lever to the required length and the upper thread and the lower thread are in the position just before the severance,
- FIG. 10
- 3 is a perspective view of the brush cutter assembly comprising a plurality of superimposed and mutually displaceable sheets,
- FIG. 11
- an enlarged perspective view of the separation device in
FIG. 10 in the separation moment (shown is the bobbin thread), - FIG. 12
- as
FIG. 11 , immediately after disconnecting, - FIG. 13
- a situation at 185 °, the thread catcher reaches its starting position, the upper thread is pulled by the thread lever from the thread catcher mechanism, the lower thread is in a defined position on the thread guide plate and is held in position there,
- FIG. 14
- a situation at 220 °, the first cycle is completed, the at least one upper and the lower thread is separated and pulled forward to the required length, ready for sewing or embroidering, the machine stops, a new workpiece can be inserted,
- FIG. 15
- the machine starts to generate the first stitch at a 220 ° harmonic angle,
- FIG. 16
- Situation at 30 °, upper thread loop has been created and the gripper grasps the upper thread loop,
- FIG. 17
- Situation at 60 °, the thread catcher begins to shift to the right,
- FIG. 18
- Situation at 80 °, from the upper thread loop the fabric thread and the needle thread are detected in correspondingly arranged exceptions on the thread catcher,
- FIG. 19
- Situation at 90 °, the fabric thread has been pulled by the thread catcher under the needle plate,
- FIG. 20
- an enlarged section in
FIG. 19 . - FIG. 21
- Situation at 95 °, the thread brake plate is opened by the thread catcher mechanism at the marked point A and the thread wiper is actuated by the middle thread catcher,
- FIG. 22
- Situation at 100 °, the thread brake plate closes for a short moment (the threads are similar to the arrangement in
FIG. 21 ) - FIG. 23
- Situation at 120 °, the thread lever reaches the end position and pulls the existing thread through the open low-friction thread brake plate to the desired length, the first stitch is completed,
- FIG. 24
- Situation at 240 °, the second stitch begins and the thread brake plate closes for a brief moment and acts as a temporary thread brake, which is loaded with increased force,
- FIG. 25
- Situation at 255 °, the thread catcher is returned to the starting position and the upper thread is now retained by the yarn brake plate with a defined holding force, it creates a rich knot and the thread wiper wipes the at least one upper thread and the lower thread in a defined position,
- FIG. 26
- Situation at 265 °, corresponds to enlarged representation of a detail in
FIG. 25 . - FIG. 27
- Situation at 30 °, the second stitch is generated
- FIG. 28
- Situation at 50 °, the gripper pulls the thread loop away from the needle,
- FIG. 29
- Situation at 150 °, the thread lever pulls back the upper thread,
- FIG. 30
- Situation at 170 °, the needle thread is just below the needle plate,
- FIG. 31
- Situation at 190 °, the bobbin thread is caught by the upper thread and the thread lever pulls the knot to the cloth base and
- FIG. 32
- Situation at 220 °, the thread lever has pulled the upper thread loop with the detected bobbin thread on the underside of the fabric and a full knot is completed,
- FIG. 33a
- an enlarged view of the thread cutting and embroidering unit in the starting position,
- FIG. 33b
- an enlarged view of the thread cutting and embroidering unit in the starting position, but in the end position,
- Figure 33c
- a detailed view of the thread cutting unit from above after catching the upper thread,
- Figure 33d
- the thread cutting unit after a further step,
- FIG. 33e
- the thread cutting unit after a further step, thread in thread depot,
- FIG. 34
- an exploded view of the thread cutting and Anstickvorrichtung,
- Figure 34a
- ever a situation of the thread layer,
- FIG. 35
- a perspective view of the thread wiper and yarn brake unit.
In der Darstellung gemäss
In
Bei einem Oberwellenwinkel von 320° hat die Spitze der Nadel 11 die Stichplatte 3 durchquert und nach weiteren 50° hat die Greiferspitze 23 die Oberfadenschlaufe 25 erfasst und den Oberfaden 7 nach links zwischen dem Stichloch 13 und der Greiferspitze 23 ausgelenkt (
In
Beim Oberwellenkinkel 175° werden der Stofffaden 7b des Oberfadens 7 und der Unterfaden 9 geschnitten bzw. durchgetrennt (
Das Trennen erfolgt, wie in
Nach einer weiteren Drehung der Oberwelle bis zum Winkel 185° haben die Fadenfänger 19 ihre Ausgangsstellung erreicht. Der Oberfaden 7 wird durch den Fadenhebel (nicht dargestellt) aus den Fadenfängern 19 herausgezogen. Der Unterfaden 9 liegt nun in definierter Lage C (
Bei einem Oberwellenwinkel von 220° ist der Zyklus abgeschlossen. Der Nähfuss (nicht dargestellt) wird angehoben und das Nähgut (nicht dargestellt) kann entnommen werden. Der Oberfaden 7 und der Unterfaden 9 sind vom Nähgut getrennt und auf die erforderliche Länge vorgezogen (
Im Gegensatz zum Oberwellenwinkel 220° zu Beginn des letzten Stiches am Ende einer Naht liegen nun der Oberfaden 7 und der Unterfaden 9 nicht mehr gestreckt von der Nadel 11 zum Stickloch 13 bzw. von der Spulenkapsel 15 zum Stichloch 13. Der mindestens eine Oberfaden 7 ist lose und der Unterfaden 9 wird durch die Fadenschneideinheit 5 positioniert. Sie befinden sich nun in einer optimalen Ausgangslage für das Ansticken bzw. Annähen einer neuen Naht.In the illustration according to
In
At a harmonic angle of 320 °, the tip of the
In
At the
The separation takes place as in
After a further rotation of the harmonic to 185 ° angle, the
At a harmonic angle of 220 °, the cycle is completed. The presser foot (not shown) is raised and the fabric (not shown) can be removed. The
In contrast to the harmonic angle 220 ° at the beginning of the last stitch at the end of a seam, the
Nachdem nun durch die Fadenschneid- und Anstickeinheit 5 sowohl der Oberfaden 7 als auch der Unterfaden 9 am Ende einer Näh- oder Sticknaht in einer optimalen Position für das Ansticken liegen (vgl.
Bei 120° Oberwellenwinkel ist die momentane Endstellung erreicht und das Fadenbremsblech 65 ist wieder geöffnet. Der Fadenhebel zieht den vorhandenen Oberfaden 7 durch das geöffnete reibungsarme Fadenbremsblech auf die erforderliche Länge nach. Bei Oberwellenwinkel 240°, d.h. nach Vollendung einer vollständigen Maschinendrehung um 360°, schliesst das Fadenbremsblech 65 kurzfristig. Dies ergibt eine zusätzliche wichtige Prozesssicherheit, da der lose Oberfaden 7 nicht mit dem Fadenfänger 19 aus dem Fadenbremsblech 65 mitgezogen werden kann (Stelle D). Bei 255° fahren die Fadenfänger 19a-19c in die Ausgangsstellung zurück und der Oberfaden 7 wird vom Fadenklemmblech 65 mit einer definierten Haltekraft zurückgehalten, damit ein satter Knoten entstehen kann und damit zudem der lose Oberfadenschlauf nicht durch das Loch im Stoff nachgezogen werden kann (
Bei 220° ist die Anstickfunktion nach zwei Stichen erfolgreich abgeschlossen und die nächsten Stiche können erfolgen. Die
In den
Die Wischereinheit 37 ist ortsfest im Unterarm der Nähmaschine angeordnet. Auf der Wischer- und Fadenbremseinheit 37 sind zwei schwenkbare und federbelastete Hebel, nämlich das Fadenbremsblech 65 und ein Wischerhebel 51 gelagert. Der zweiarmige Wischerhebel 51 trägt dazu auf dem ersten seiner Arme einen parallel zur Drehachse des Wischerhebels 51 liegenden Bolzen 53, der vom unteren Fadenfänger 19c (Kontur 17f) zur Seite geschoben wird. Beim Schwenken des Wischerhebels 51 werden die abgeschnittenen Fadenenden zur Seite geschoben und liegen dann in optimaler Ansticklage bzw. Annählage.Now that both the
At 120 ° harmonic angle, the current end position is reached and the
At 220 ° the attack function is successfully completed after two stitches and the next stitches can be made. The
In the
The
In den
In den
In the
In der
Claims (6)
- A method for cutting the lower and at least one upper thread at the end of a sewing or stitching procedure, on a sewing machine with a CB-gripper-type gripper or a CB gripper, which has a gripper tip, characterized by the following method steps:a) after creation of the final stitch of a seam, a needle (11) approaches the surface of the material and of a stitch plate (3),b) a lower thread (9) is deflected by at least one control edge (17a, 17b) of a thread catcher (19) between a thread exit opening on a bobbin case (15) and a stitch hole (13),c) the lower thread (9) is ejected from the at least one control edge (17a, 17b) and slides into a thread deposit (21) on the thread catcher (19) while the needle (11) pierces the material,d) the thread catcher (19) reaches its end position and the needle (11) reaches the lower end position,e) an upper thread (7) is captured by the gripper tip, and a needle thread (7a) and a material thread (7b) are forced apart,f) while the needle (11) again travels upwards, the thread catcher (19) moves backwards and moves back the lower thread (9) captured in the thread deposit (21) and also the upper thread (7) also captured now by the thread catcher (19),g) at the same time, the needle thread (7a) is pulled forward by a thread lever and then the upper (7) and lower thread (9) are cut together,h) the thread catcher (19) reaches the initial position and the loose end of the upper thread (7) is pulled out by the thread lever from a thread cutting unit (5),i) the cycle is completed and the upper (7) and lower thread (9) are pulled forward through to the desired thread length for sewing or stitching on.
- The method according to claim 1, characterized in that the loose end of the lower thread (9) is positioned by a thread wiper (37) in such a manner that, when it is sewn or stitched on, the end cannot be sewn in.
- A device for a sewing machine, comprising a thread cutting unit (5) and a piercing and sewing on unit, a CB gripper (1) containing a gripper tip (23), a bobbin case (15) for holding a lower thread bobbin, a needle (11) for an upper thread (7) and a thread lever, for implementing the method according to claim 1 or claim 2,
characterized by
an upper (19a), a middle (19b) and a lower thread catcher (19c), a thread tensioning plate (31) above the upper thread catcher (19a) and a clamping plate (61) below the lower thread catcher (19c), a control and separating edge (17a) on the upper thread catcher (19a), a control and separating edge (17b) on the middle thread catcher (19b), a thread deposit (21) in a stationary thread guidance plate (33) between the middle thread catcher (19b) and the lower thread catcher (19c), a blade (29) arranged in a fixed position, which is inserted between the middle thread catcher (19b) and the upper thread catcher (19a), further comprising spreading edges (17e and 17d) on the thread catchers (19a and 19b) and means for moving the thread catchers (19a-19c) and the thread plate (31) and the clamping plate (61) relative to the blade (29) which is arranged in a fixed manner on the sewing machine. - The device according to claim 3, characterized in that, opposite the ends of the thread cutting unit (5) - and of the stitching and sewing on unit - and interacting with the latter unit when moving the thread cutting unit (5) and the stitching and sewing on unit, a wiper unit (37) is arranged in a fixed position.
- The device according to claim 4, characterized in that, on the wiper unit (37), a two-arm wiper lever (51) is supported in such a manner that it can be pivoted, and, when the thread cutting unit (5) is moved, an arm on the middle thread catcher (19b) can be pivoted out to transfer the end of the lower thread (9).
- The device according to any one of claims 3 to 5, characterized in that, when the thread cutting unit (5) is moved, the lower thread (9) captured by the thread catchers (19a-19c) and/or the at least one upper thread (7) can be separated on the blade (29) in a tension-free state held by the clamping plate (31).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH00339/11A CH704524A1 (en) | 2011-02-28 | 2011-02-28 | The method for cutting the bottom and at least one upper thread and a method for embroidering and a device for carrying out the method. |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2508665A2 EP2508665A2 (en) | 2012-10-10 |
EP2508665A3 EP2508665A3 (en) | 2014-12-17 |
EP2508665B1 true EP2508665B1 (en) | 2018-03-14 |
Family
ID=46750679
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12405005.5A Active EP2508665B1 (en) | 2011-02-28 | 2012-01-09 | Method for cutting the lower thread and at least one upper thread and method for beginning sewing and a device for performing the method |
Country Status (3)
Country | Link |
---|---|
US (1) | US8640639B2 (en) |
EP (1) | EP2508665B1 (en) |
CH (1) | CH704524A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH704524A1 (en) * | 2011-02-28 | 2012-08-31 | Bernina Int Ag | The method for cutting the bottom and at least one upper thread and a method for embroidering and a device for carrying out the method. |
CH704599A1 (en) * | 2011-03-14 | 2012-09-14 | Bernina Int Ag | Activation device for path and time-dependent movement of a thread cutting and Anstickeinheit and a yarn brake. |
JP6374745B2 (en) * | 2014-09-29 | 2018-08-15 | Juki株式会社 | sewing machine |
DE102017207627A1 (en) * | 2017-05-05 | 2018-11-08 | Dürkopp Adler AG | Assembly for creating a seam beginning upper thread with a desired seam projection |
CN111020903B (en) * | 2019-12-17 | 2021-08-24 | 杰克缝纫机股份有限公司 | Seam-making thread trimming mechanism and method thereof |
CN113235242B (en) * | 2021-04-27 | 2023-03-31 | 诸暨兴大豪科技开发有限公司 | Thread cutting control method and device for embroidery equipment and equipment |
CN113604994B (en) * | 2021-06-16 | 2022-09-09 | 浙江信胜科技股份有限公司 | Small towel embroidering device capable of realizing multidirectional work and embroidery machine |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
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DE1968920U (en) * | 1967-07-08 | 1967-09-21 | Pfaff Ag G M | THREAD CUTTER FOR ZIG-ZAG SEWING MACHINES. |
US4365568A (en) * | 1980-05-15 | 1982-12-28 | The Singer Company | Underbed thread trimmer and controlled single-operation cam mechanism therefor |
DE3715603C1 (en) * | 1987-05-09 | 1988-06-23 | Pfaff Ind Masch | Thread cutting device for zigzag sewing machines |
JP2671478B2 (en) * | 1989-02-10 | 1997-10-29 | ブラザー工業株式会社 | Needle thread clamp device for sewing machine |
JP2566199Y2 (en) * | 1992-07-27 | 1998-03-25 | ブラザー工業株式会社 | Sewing machine automatic thread trimmer |
SE512359C2 (en) * | 1998-07-09 | 2000-03-06 | Viking Sewing Machines Ab | Arrangement of thread cutting in a sewing machine and use of the upper thread cutting device |
JP4047624B2 (en) * | 2002-05-14 | 2008-02-13 | Juki株式会社 | sewing machine |
JP4030864B2 (en) * | 2002-12-10 | 2008-01-09 | Juki株式会社 | Upper thread holding device for sewing machine |
US6814018B1 (en) * | 2003-10-29 | 2004-11-09 | Shing Ray Sewing Machine Co., Ltd. | Automatic thread cutting apparatus for sewing machines |
US7603957B2 (en) * | 2006-10-03 | 2009-10-20 | Juki Corporation | Thread cutting device of sewing machine |
JP2008259753A (en) * | 2007-04-13 | 2008-10-30 | Juki Corp | Thread cutter of sewing machine |
JP2009061102A (en) * | 2007-09-06 | 2009-03-26 | Juki Corp | Thread cutter for sewing machine |
JP2009195464A (en) * | 2008-02-21 | 2009-09-03 | Juki Corp | Thread cutter of sewing machine |
CH704524A1 (en) * | 2011-02-28 | 2012-08-31 | Bernina Int Ag | The method for cutting the bottom and at least one upper thread and a method for embroidering and a device for carrying out the method. |
-
2011
- 2011-02-28 CH CH00339/11A patent/CH704524A1/en not_active Application Discontinuation
-
2012
- 2012-01-09 EP EP12405005.5A patent/EP2508665B1/en active Active
- 2012-02-28 US US13/406,855 patent/US8640639B2/en active Active
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
US8640639B2 (en) | 2014-02-04 |
EP2508665A3 (en) | 2014-12-17 |
EP2508665A2 (en) | 2012-10-10 |
CH704524A1 (en) | 2012-08-31 |
US20130055940A1 (en) | 2013-03-07 |
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