EP2300654B1 - Procédé et dispositif de séparation du fil d'aiguille et du fil de navette de machines à coudre à double point noué et à navette tournant dans un plan horizontal - Google Patents

Procédé et dispositif de séparation du fil d'aiguille et du fil de navette de machines à coudre à double point noué et à navette tournant dans un plan horizontal Download PDF

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Publication number
EP2300654B1
EP2300654B1 EP09768933A EP09768933A EP2300654B1 EP 2300654 B1 EP2300654 B1 EP 2300654B1 EP 09768933 A EP09768933 A EP 09768933A EP 09768933 A EP09768933 A EP 09768933A EP 2300654 B1 EP2300654 B1 EP 2300654B1
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EP
European Patent Office
Prior art keywords
thread
needle
catcher
looper
stitch
Prior art date
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Active
Application number
EP09768933A
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German (de)
English (en)
Other versions
EP2300654A1 (fr
Inventor
Franz Gries
Hermann Rutz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pfaff Industriesysteme und Maschinen GmbH
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Pfaff Industriesysteme und Maschinen GmbH
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Application filed by Pfaff Industriesysteme und Maschinen GmbH filed Critical Pfaff Industriesysteme und Maschinen GmbH
Publication of EP2300654A1 publication Critical patent/EP2300654A1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • 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

Definitions

  • the invention relates to a method and a device for cutting the needle and the looper thread on lockstitch sewing machines with gripper circulating in a horizontal plane and a feed device with a needle or top conveyor by means of a thread cutting device, and a sewing machine for carrying out the method.
  • the short length of the yarn side yarn ends is achieved primarily by not only the yarn catcher is brought from a rest position to a reversal position and from there back to the rest position, but also the knife from a remote from the stitch hole rest position in a stitch hole adjacent cutting position
  • This also has a about a gripper shaft directed parallel shaft pivoting motion sensor, on its underside in the region of its front end a barb-shaped yarn thread catching part and a cutting edge part are formed.
  • the movement of the knife is movable from its rest position along a trajectory extending through the needle path center in a reversal position.
  • During the return movement of the movement knife to the rest position of the thread catching part first expands the needle thread loop formed by the gripper and then cuts through the needle and the hook thread in cooperation with a cutting blade, at the front end of a cutting edge portion is formed.
  • it is also necessary to move the cutting blade from its rest position to its cutting position before performing the cutting process.
  • the invention is therefore based on the object for lockstitch sewing machines with rotating in a horizontal plane gripper and a feed device with a needle or upper conveyor a method for severing needle and looper thread to create, in conjunction with a simple trained, a thread catcher and having a knife having thread cutting device optimally short thread-side yarn ends results, but only requires the movement of either the thread catcher or the knife.
  • the material to be moved by the feed by an amount and in this position of the material at ineffective feed device at least one further stitch (knotting stitch) to form it is first achieved that the seam formed despite the very It is very difficult to put up with short yarn ends on the thread side.
  • the further measure to move the thread catcher from a laterally located behind the needle rest position along a running between the tap hole and the side wall of the gripper trajectory in a motion reversal position in which leading to the fabric leg of the needle thread loop together with the looper thread through the on Thread catcher trained barbs are detected the ability to guide the detected threads in the field of stitch pattern and cut there.
  • a structurally favorable and space-saving solution for the movement of the thread catcher is achieved when it is pivotable about an axis parallel to the gripper shaft, and the trajectory of the catcher tip between the cam of the needle plate on the one hand and the needle hole of the feed dog on the other hand.
  • the thread catcher can be made relatively flat and move within a horizontal plane above the gripper from its rest position to the reverse position and from there back to its rest position.
  • a compact design for the thread catcher is achieved when the barbs is formed by a provided on its outer side surface incision, which is downstream of the tip of the thread catcher and the thread catcher on its upper side a tip also subordinate groove for receiving the to be separated Has threads that opens into the incision.
  • the separated areas of needle and looper thread can be taken within the groove and separated by cutting edges formed at the outlet of the groove without the aid of a movable counter knife.
  • the thread supply-side ends characterized in that they lead from the interface first to the incision and thence along the underside of the thread catcher to the respective thread supply, sufficient to form the initial stitches of the next sewing cycle sufficient length.
  • the tip-side end region of the groove is delimited by a bore passing through the thread catcher, the dividing edges of the thread catcher formed thereby can be produced relatively easily and can also be sharpened slightly.
  • a vertical mobility limiting stop is provided on the underside of the throat plate in the region of the trajectory of the yarn catcher.
  • a serving for receiving a gripper 1 of a lockstitch sewing machine housing 2 is shown, which can be used in a conventional manner in the base plate of a corresponding sewing machine.
  • the gripper 1 arranged on a (not shown) parallel to the movement path of the needle shaft, which in turn is driven via a corresponding gear from a stub shaft 4, which is in driving connection with the machine main shaft.
  • the gripper 1 works to form lockstitches with a thread-guiding needle 5, which is received by a needle bar, which is also in a corresponding drive connection with the machine main shaft.
  • the circulating in a horizontal plane gripper 1 is provided with a hook tip 6 and has in a known manner to a thread supply receiving coil 7, which is secured by means of a between two cams 8 of a housing 2 attached to the throat plate 9 stopping piece 11 against rotational movement.
  • a capsule fan 12 is provided in the housing 2 in a conventional manner, the movements of which are also derived from the stub shaft 4.
  • the sewing machine has a feed device with a needle and / or an upper transport device. Accordingly, the also driven by a corresponding gear from the stub shaft 4 feed dog 13 is provided in a conventional manner for the passage of the needle 5 with a stitch hole 13.
  • the sewing machine also has, in a manner known per se, a stopping device which makes it possible to stop the machine main shaft in certain angular positions.
  • the thread cutting device has a thread catcher 14, which is arranged on a parallel to the gripper shaft shaft 15, which also receives its drive via a corresponding gear from the main machine shaft.
  • the thread catcher 14 having a substantially "L" shape in plan view is laterally behind the needle 5 in its rest position and is in a horizontal plane from its rest position along a trajectory extending between the stitch hole 13 and the side wall 16 of the gripper 1 Moving reversible position and pivotable from this along the same trajectory back to the rest position feasible.
  • a catcher tip 17 is formed on this, which is a barb 18 downstream.
  • an incision 21 is formed on the outer side surface 19 of the suture catcher 14, which is arranged downstream of the catcher tip 17.
  • the thread catcher 14 for receiving the threads to be separated on a catcher tip 17 downstream groove 23, which opens at one end into the recess 21 and the other end in a thread catcher 14 passing through bore 24.
  • the end regions of the groove 23 merging into the bore 24 form a semicircular cutting edge 25 of the thread catcher 14.
  • a cooperating with the thread catcher 14 stationary arranged counter knife 26 is provided in the immediate area of the stitch pattern, the cutting edge 27 is directed to achieve a pulling cut at an acute angle to the feed direction of the material.
  • the counter knife 26 is arranged on the underside of the feed dog 13 of the sewing machine and firmly connected thereto.
  • a stop 28 limiting its vertical mobility arranged at the bottom of the throat plate 9 in the region of the trajectory of the yarn catcher 17 .
  • the needle thread loop is widened by the gripper during the formation of a partial stitch (cutting stitch), after which the thread catcher 14 from a laterally located behind the needle 5 rest position along a between the stitch hole 13 and the side wall 16 of the gripper extending trajectory is moved in a motion reversal position. While the needle and gripper continue to move during the penetration of the suture catcher 14 into the widened needle thread loop, however, since the needle thread loop is caught by the suture catcher 14 and passed therethrough, the initiated stitch can not be properly completed. The formation of this "stitch" thus serves only to allow the penetration of the catcher tip (17) in the expanded needle thread loop and laterally deflect both their leading to the fabric leg and extending from the gripper to the fabric portion of the looper thread.

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

Claims (11)

  1. Procédé de séparation du fil d'aiguille et du fil de navette avec formation de courtes extrémités de fil du côté du produit cousu dans des machines à coudre à double point noué et à navette tournant dans un plan horizontal et avec un dispositif d'avance avec un dispositif de transport d'aiguille ou de transport haut, ainsi qu'avec un dispositif de coupe de fil avec un capteur de fil avec une pointe de capteur formée sur celui-ci et avec une arête de coupe, qui coopère avec un couteau opposé, se composant des étapes suivantes:
    a) après exécution de la couture, le produit cousu est avancé par le dispositif d'avance d'une quantité qui est plus petite que la longueur du point avec lequel la couture est formée;
    b) dans cette position du produit cousu, on forme au moins un autre point (point de nouage) avec le dispositif d'avance inactif;
    c) en position inchangée du produit cousu, on élargit la boucle du fil d'aiguille au moyen de la navette pendant la formation d'un point partiel (point de coupe);
    d) on déplace le capteur de fil (14) d'une position de repos située latéralement derrière l'aiguille (5) le long d'un trajet s'étendant entre le trou de piqûre (13) et la paroi latérale (16) de la navette (-1) jusqu'à une position d'inversion de mouvement, dans lequel la pointe de capteur (17) pénètre dans la boucle de fil d'aiguille élargie et dévie ainsi la branche de celle-ci conduisant au produit cousu et aussi la région du fil de navette s'étendant de la navette au produit cousu;
    e) dans la position d'inversion de mouvement du capteur de fil (17), la branche de la boucle de fil d'aiguille conduisant au produit cousu et le fil de navette sont saisis par un hameçon (18) formé sur le capteur de fil (14) et conduits dans la région du trou de piqûre (13);
    f) pendant la suite du mouvement du capteur de fil (14) de la région du trou de piqûre à sa position de repos, la branche de la boucle de fil d'aiguille conduisant au produit cousu et le fil de navette sont tranchés par le couteau opposé (26) disposé dans la région du trou de piqûre (13) de la plaque d'entraînement de tissu (10) en coopération avec l'arête de coupe (25) du capteur de fil (14).
  2. Procédé de séparation du fil d'aiguille et du fil de navette selon la revendication 1, caractérisé en ce que, avant le déplacement du capteur de fil (14) dans la position d'inversion de mouvement, la plaque d'entraînement de tissu (10) est positionnée de telle manière que son trou de piqûre (13) soit situé au milieu de la trajectoire de déplacement de l'aiguille (5).
  3. Procédé de séparation du fil d'aiguille et du fil de navette selon la revendication 1, caractérisé en ce que, après la saisie du fil de navette par le capteur de fil (14), ce fil de navette est prélevé de la réserve de fil et est conduit entre les mâchoires d'un pince-fil disposé dans la trajectoire de déplacement du capteur de fil (14, ou du fil de navette).
  4. Machine à coudre pour exécuter le procédé selon la revendication 1, présentant:
    a) une barre à aiguille destinée à recevoir une aiguille de guidage de fil (5);
    b) une navette (1) tournant dans un plan horizontal et coopérant avec celle-ci pour la formation de coutures à double point noué;
    c) un dispositif pour arrêter la barre à aiguille ou la navette (1) dans des positions angulaires prédéterminables de la navette (1) ou de l'arbre principal de la machine;
    d) un dispositif d'avance avec un dispositif de transport d'aiguille et/ou de transport haut avec une plaque d'entraînement de tissu (10) présentant un trou de piqûre (13);
    e) un dispositif de coupe de fil avec un capteur de fil (14), qui est déplaçable d'une position de repos à une position d'inversion de mouvement le long d'une trajectoire de déplacement s'étendant entre le trou de piqûre (13) de la plaque d'entraînement de tissu (10) et une paroi latérale (16) de la navette (1) et présente une pointe de capteur (17), qui pénètre pendant ce déplacement dans la boucle de fil d'aiguille élargie par la navette (1);
    f) un hameçon (18) formé sur la pointe de capteur (17) qui, pendant le mouvement de retour du capteur de fil (14) dans sa position de repos, conduit les fils saisis par lui dans la région du trou de piqûre (13) de la plaque d'entraînement de tissu (10);
    g) un couteau opposé fixe (26) disposé dans cette région, qui tranche les fils en coopération avec des arêtes de coupe (26) formées sur le capteur de fil (14).
  5. Machine à coudre selon la revendication 4, caractérisée en ce que le capteur de fil (14) peut pivoter autour d'un axe orienté parallèlement à l'arbre de navette, et la trajectoire de déplacement de la pointe de capteur (17) s'étend entre les cames (8) de la plaque à aiguille (9) d'une part et le trou de piqûre (13) de la plaque d'entraînement de tissu (10) d'autre part.
  6. Machine à coudre selon la revendication 4, caractérisée en ce que l'hameçon (18) du capteur de fil (14) est formé par une entaille (21) prévue sur la surface latérale extérieure (19) de celui-ci et qui est disposée après la pointe de capteur (17).
  7. Machine à coudre selon la revendication 6, caractérisée en ce que le capteur de fil (14) présente sur son côté supérieur (22) une rainure (23) disposée après sa pointe (17), destinée à recevoir les fils à trancher et qui débouche dans l'entaille (21).
  8. Machine à coudre selon la revendication 7, caractérisée en ce que l'arête de limitation de la rainure (23) forme l'arête de coupe (25) du capteur de fil.
  9. Machine à coudre selon la revendication 4, caractérisée en ce que le couteau opposé (26) est disposé à proximité immédiate de la plaque d'entraînement de tissu (10) et son arête de coupe (27) est orientée sous un angle aigu par rapport à la direction d'avance du produit cousu.
  10. Machine à coudre selon la revendication 9, caractérisée en ce que le couteau opposé (26) est fixé sur la plaque d'entraînement de tissu (10).
  11. Machine à coudre selon la revendication 4, caractérisée en ce qu'il est prévu sur le côté inférieur de la plaque à aiguille, dans la région de la trajectoire de déplacement du capteur de fil (14), une butée (28) limitant la mobilité verticale de celui-ci.
EP09768933A 2008-06-24 2009-06-16 Procédé et dispositif de séparation du fil d'aiguille et du fil de navette de machines à coudre à double point noué et à navette tournant dans un plan horizontal Active EP2300654B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008030620A DE102008030620B3 (de) 2008-06-24 2008-06-24 Verfahren und Vorrichtung zum Durchtrennen des Nadel- und des Greiferfadens an Doppelsteppstich-Nähmaschinen mit in einer horizontalen Ebene umlaufendem Greifer
PCT/EP2009/004353 WO2009156084A1 (fr) 2008-06-24 2009-06-16 Procédé et dispositif de séparation du fil d'aiguille et du fil de navette de machines à coudre à double point noué et à navette tournant dans un plan horizontal

Publications (2)

Publication Number Publication Date
EP2300654A1 EP2300654A1 (fr) 2011-03-30
EP2300654B1 true EP2300654B1 (fr) 2012-01-04

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Application Number Title Priority Date Filing Date
EP09768933A Active EP2300654B1 (fr) 2008-06-24 2009-06-16 Procédé et dispositif de séparation du fil d'aiguille et du fil de navette de machines à coudre à double point noué et à navette tournant dans un plan horizontal

Country Status (4)

Country Link
EP (1) EP2300654B1 (fr)
AT (1) ATE540151T1 (fr)
DE (1) DE102008030620B3 (fr)
WO (1) WO2009156084A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023242171A1 (fr) 2022-06-17 2023-12-21 Pfaff Industriesysteme Und Maschinen Gmbh Installation de couture

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011102928A1 (de) 2011-05-23 2012-11-29 Pfaff Industriesysteme Und Maschinen Ag Nähmaschine mit Fadenklemmme
DE202016104320U1 (de) 2015-10-12 2016-09-19 Xi'an Typical Europe Gmbh Nähmaschine
DE102017207626A1 (de) * 2017-05-05 2018-11-08 Dürkopp Adler AG Verfahren zum Erzeugen eines Naht-Endunterfadens mit vorgegebenem Soll-Nahtüberstand

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1485265C2 (de) * 1962-09-18 1975-12-11 G. M. Pfaff Ag, 6750 Kaiserslautern Fadenschneideinrichtung an Nähmaschinen
DE1941681A1 (de) * 1969-08-16 1971-06-09 Pfaff Ag G M Fadenschneideinrichtung an Doppelsteppstichnaehmaschinen
DE1941794A1 (de) * 1969-08-16 1971-03-18 Pfaff Ag G M Fadenschneideinrichtung an Doppelsteppstichnaehmaschinen
JPH0761391B2 (ja) * 1988-07-15 1995-07-05 ジューキ株式会社 ポスト型ミシンの糸切り装置
US4879960A (en) * 1988-07-22 1989-11-14 Kansai Special Usa Corp. Thread trimmer system for in-line chain stitch sewing machine
US5289791A (en) * 1993-03-31 1994-03-01 General Motors Corporation Sewing machine with thread wiper and auxiliary cutter
DE19722395C1 (de) * 1997-05-28 1998-08-06 Pfaff Ag G M Nähmaschine mit einer Fadenschneideinrichtung
JP5042573B2 (ja) * 2006-09-15 2012-10-03 Ｊｕｋｉ株式会社 ミシン
JP2009061020A (ja) * 2007-09-05 2009-03-26 Brother Ind Ltd ミシンの糸切り装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023242171A1 (fr) 2022-06-17 2023-12-21 Pfaff Industriesysteme Und Maschinen Gmbh Installation de couture
DE102022206102A1 (de) 2022-06-17 2023-12-28 Pfaff Industriesysteme Und Maschinen Gmbh Nähanlage

Also Published As

Publication number Publication date
ATE540151T1 (de) 2012-01-15
EP2300654A1 (fr) 2011-03-30
WO2009156084A1 (fr) 2009-12-30
DE102008030620B3 (de) 2009-12-24

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