EP1847641B1 - Couteau tireur de fil pour une machine à coudre - Google Patents

Couteau tireur de fil pour une machine à coudre Download PDF

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Publication number
EP1847641B1
EP1847641B1 EP07007046A EP07007046A EP1847641B1 EP 1847641 B1 EP1847641 B1 EP 1847641B1 EP 07007046 A EP07007046 A EP 07007046A EP 07007046 A EP07007046 A EP 07007046A EP 1847641 B1 EP1847641 B1 EP 1847641B1
Authority
EP
European Patent Office
Prior art keywords
thread
pulling knife
pulling
blade
sewing machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP07007046A
Other languages
German (de)
English (en)
Other versions
EP1847641A1 (fr
Inventor
Andreas Riffel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Duerkopp Adler AG
Original Assignee
Duerkopp Adler AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE102006019193A external-priority patent/DE102006019193A1/de
Application filed by Duerkopp Adler AG filed Critical Duerkopp Adler AG
Publication of EP1847641A1 publication Critical patent/EP1847641A1/fr
Application granted granted Critical
Publication of EP1847641B1 publication Critical patent/EP1847641B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/06—Loop takers, e.g. loopers for overedge-stitch sewing machines
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/30—Driving-gear for loop takers
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/30—Driving-gear for loop takers
    • D05B57/34—Driving-gear for loop takers in overedge-stitch sewing machines
    • 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
    • D05B57/10—Shuttles
    • D05B57/14—Shuttles with rotary hooks
    • D05B57/143—Vertical axis type

Definitions

  • the invention relates to a thread-pulling knife for a sewing machine, in particular for a lockstitch sewing machine, according to the preamble of claim 1.
  • Such thread-pulling knives are known from the DE 101 17 560 C1 and the DE 101 23 075 C1 , With regard to a trouble-free yarn course of a needle fed upper thread of the sewing machine there is still room for improvement in demanding applications.
  • the extended end portion prevents in particular the needle thread is caught in the loop undesirable on the thread-pulling knife or other sewing machine components. It is also ensured that, in particular, the needle thread does not undesirably wrap around the thread-pulling knife. Overall results in a trouble-free threadline.
  • the rounded end section additionally ensures that the threadline is not disturbed by the thread-pulling knife.
  • a length of the end portion according to claim 3 has been found to ensure a trouble-free thread course particularly suitable.
  • An arcuate design of the thread-pulling knife according to claim 4 ensures that a main body of the thread-pulling knife disturbs the threadline as little as possible.
  • a lockstitch sewing machine 1 has a base plate 2 with a stand 3 extending upward therefrom and an angled arm 4. The latter ends in a head 5.
  • an arm shaft 6 is rotatably supported.
  • 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.
  • the needle 10 leads in an eye from a spool 12 via a thread tensioning device and the thread lever 8 supplied needle thread 13th
  • the base plate 2 carries a screw-mounted support plate 14, on which a workpiece 15 rests.
  • the support plate 14 is formed with a recess 16 for the passage of a 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 is mounted for receiving a looper thread supply.
  • the gripper 19 is rotatable about a vertical gripper axis 23.
  • a sewing operation direction of rotation 24 runs in Fig. 2 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 is used to cut off the looper thread.
  • the thread-pulling knife 29 is located between an in Fig. 2 illustrated basic position and a in Fig. 4 shown thread detection position about a parallel to the gripper axis 23 pivot axis 30 pivotally.
  • the thread-pulling knife 29 has one in the view Fig. 2 reminiscent of a sickle basic form, the free end in the basic position in the view after Fig. 2 extends around the coil housing 22 around.
  • the stitch hole 18 is adjacent to one Detecting groove 31 of the thread pulling knife 29 with a groove bottom side cutting edge 32.
  • the detection groove 31 is executed in a right angle to a horizontally extending base body 32a angled edge portion 32b of the thread pulling knife 29.
  • An extended free end portion 32 c of the thread-pulling knife 29 is in the plan view of the Fig. 2 and 4 executed rounded end.
  • the length of the free end portion 32c of the thread-pulling knife 29 results in that the needle thread 13 does not undesirably wrap around the thread-pulling knife during looping.
  • the rounded shape of the free end portion 32c leads to a trouble-free yarn path of the needle thread 13 and the looper thread.
  • a stationary counter knife 33 Fixed to the base plate 2 on a boom is a stationary counter knife 33, which cooperates to cut the thread when pivoting the thread pulling knife 29 of the Fadener terminates- in the basic position.
  • a holding finger 34th In the sewing operation direction of rotation 24, the spool housing 22 is secured against rotation about the gripper axis 23 by a first anti-rotation stop 35.
  • the latter is designed as an end face of a Kragarms 36 which is fixedly bolted to the base plate 2.
  • a first bobbin case counter-stop 37 At the first anti-rotation stop 35 is located to prevent rotation of the bobbin case 22, a first bobbin case counter-stop 37, which is formed by a first anti-rotation stop 35 facing surface of the retaining finger 34.
  • a second anti-rotation stop 38 In the opposite direction to the sewing operation direction of rotation 24, in the view Fig. 2 that is counterclockwise, the coil housing is secured against rotation about the gripper axis 23 by a second anti-rotation stop 38.
  • the latter is formed by a integrally formed on the free end of the thread pulling knife 29 stop surface, which represents the end face of a lower projection 39, the edge opposite to the second anti-rotation stop 38 without edges in the main body 32a of the thread pulling knife 29.
  • the second anti-rotation stop 38 is thus fixed to the thread-pulling knife 29.
  • the second anti-rotation stop 38 cooperates with a second bobbin case counter-stop 40. This is formed by the first coil housing counter-stop 37 opposite and the second anti-rotation stop 38 facing surface of the retaining finger 34 of the coil housing 22nd
  • the abutment of the first anti-rotation stopper 35 on the first bobbin case counter stop 37 prevents the bobbin case 22 from rotating with the gripper 19.
  • the gripper 19 rotates in the opposite direction, which may occur during adjustment work on the sewing machine or even when the sewing needle 10 is moved back to a top thread position after a successful thread trimming operation, a maximum clearance between the sewing needle 10 and the platen 14th to adjust for a work piece 15, the installation of the second anti-rotation stopper 38 on the second bobbin case counter-stop 40 prevents the bobbin case 22 from contacting the gripper 19 in the opposite direction co-rotate.
  • the thread-pulling knife 29 is secured in the basic position in order to receive a force exerted by the retaining finger 34 on the thread-pulling knife 29 via the stops 40, 38.
  • This securing the thread pulling knife 29 in the basic position makes a position securing device 41, the perspective in the Fig. 5 and their kinematic relationships in the 6 and 7 are shown.
  • the core of the position assurance device 41 is a deflection mechanism 42.
  • the latter has a pivot lever 43 which rotatably via a stationary mounted shaft 44 with the in Fig. 5 not shown thread-pulling knife 29 is connected.
  • the shaft 44 extends coaxially to the pivot axis 30.
  • a hinge connection 45 with the pivot axis 30 parallel hinge axis 46 of the pivot lever 43 is articulated to a locking lever 47.
  • the safety lever 47 is in shear connection with a lifting ram 48 of a thread-pulling knife drive 49.
  • the thread-pulling knife drive 49 which is designed as an electromagnet, serves for displacing, on the one hand, the thread-pulling knife 29 from the basic to the thread-detecting position and, on the other hand, for displacing the position-securing device 41 from one to the other Fig. 5 and 6 shown securing position in a in Fig. 7 shown release position in which a pivoting of the thread-pulling knife 29 is possible.
  • the safety lever 47 has a latch 50 designed as the first securing portion which is secured in the securing position of the position securing device 41 against a stationary and engaging in the first securing portion 50 second securing portion, which is designed as fixed and fixed to the base plate 2 bolt 51.
  • Fig. 7 shows the disengaged from the pin 51 pawl 50 in the release position of the position assurance device 41st
  • the safety lever 47 and the pivot lever 43 are biased in the securing position of the position assurance device 41 by a biasing spring 52.
  • the latter is designed as a leg spring, one leg 53 of the safety lever 47 and the other leg 54 rests against a pin 55 fixed to the pivot lever 43.
  • the biasing spring 52 is looped between the legs 53, 54 about a pin 55 a, which is fixed to the safety lever 47.
  • Fig. 5 is the cantilever 36 with the first anti-rotation stop 35 only slightly above the bobbin case 22 with the holding finger 34 over.
  • This makes it possible to arrange the coil housing 22 such that only a minimal gap remains between the thread-pulling knife 29 and an upper side of the coil housing 22.
  • This allows an arrangement of the cutting edge 32 very close to the stitch hole 18, so that 15 remaining thread ends are short on the underside of the workpiece 15 after the cutting process.
  • the yarn path of the looper thread and the needle thread 13 in the loop formation by the gripper 19 is improved.
  • the lockstitch sewing machine 1 operates as follows: In the normal sewing operation, the thread-pulling knife 29 is in the home position and the position securing device 41 is in the securing position. Thus, the bobbin case 22 is secured via the anti-rotation stops 35, 38 and the bobbin case counter-stops 37, 40 against rotation about the gripper axis 23 in both directions of rotation. With the help of the gripper 19 takes place in a known manner, the looping and knotting of looper thread and needle thread 13 for lockstitch.
  • the thread-pulling knife drive 49 is actuated, so that the lifting ram 48 extends.
  • the Hubstempel 48 pushes the cam 47a in the representations of 6 and 7 downward.
  • the thrust force of the Hubstempels 48 causes the locking lever 47 to the articulation 45 in the 6 and 7 is pivoted clockwise. This is done against the biasing force of the biasing spring 52, until the lifting ram 48 opposite surface of the locking lever 47 comes into contact with the pivot lever 43.
  • the pawl 50 moves out of the bolt 51 until the position of the deflection mechanism 42 after Fig. 7 is reached.
  • the disengaged position of the second securing portion 51 represents a thread detection drive position, in which a free pivoting of the thread pulling knife 29 from the basic position is possible.

Landscapes

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

Claims (3)

  1. Couteau tireur de fil (29) pour une machine à coudre (1), la machine à coudre comportant un crochet (19) pouvant tourner autour d'un axe de crochet vertical (23) dans un sens de rotation de fonctionnement de la machine à coudre et comprenant un corps de crochet (20) dans lequel est logé un boîtier de bobine (22) destiné à recevoir une réserve de fil de crochet, le couteau tireur de fil (29)
    - pouvant pivoter au-dessus du boîtier de bobine (22) entre une position de base (figure 2) et une position de détection de fil (figure 4) autour d'un axe de pivotement (30) parallèle à l'axe de crochet (23),
    - comprenant dans la zone d'une extrémité libre du couteau tireur de fil (29) s'étendant à l'opposé du sens de rotation de fonctionnement de la machine à coudre (24) une rainure de saisie de fil (31) comprenant une lame côté sol (32),
    caractérisé par une section d'extrémité libre (32c) prolongée au-delà de la rainure de saisie de fil (31) et conçue de façon arrondie dans une vue en élévation perpendiculaire au plan de déplacement du couteau tireur de fil (29).
  2. Couteau tireur de fil selon la revendication 1, caractérisé en ce que la longueur de la section d'extrémité libre (32c) peut être comparée avec la longueur de la rainure de saisie (31).
  3. Couteau tireur de fil selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que le couteau tireur de fil (29) est conçu en forme d'arc de sorte qu'il soit disposé autour du boîtier de bobine (22) dans la position de base montée.
EP07007046A 2006-04-21 2007-04-04 Couteau tireur de fil pour une machine à coudre Active EP1847641B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006019193A DE102006019193A1 (de) 2006-04-21 2006-04-21 Doppelsteppstichnähmaschine
DE202006009410U DE202006009410U1 (de) 2006-04-21 2006-06-16 Fadenziehmesser für eine Nähmaschine

Publications (2)

Publication Number Publication Date
EP1847641A1 EP1847641A1 (fr) 2007-10-24
EP1847641B1 true EP1847641B1 (fr) 2010-02-10

Family

ID=38226584

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07007046A Active EP1847641B1 (fr) 2006-04-21 2007-04-04 Couteau tireur de fil pour une machine à coudre

Country Status (5)

Country Link
EP (1) EP1847641B1 (fr)
JP (1) JP2007289692A (fr)
KR (1) KR101389651B1 (fr)
AT (1) ATE457381T1 (fr)
DE (2) DE202006009410U1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2692925A1 (fr) 2012-08-01 2014-02-05 Dürkopp Adler AG Couteau à tirer le fil pour une machine à coudre, module de coupe de fil et machine à coudre dotée d'un tel couteau à tirer le fil
DE102015223194B3 (de) * 2015-11-24 2017-02-23 Dürkopp Adler AG Verfahren zum Erzeugen eines Naht-Anfangsoberfadens mit kurzem Soll-Nahtüberstand sowie Baugruppe zur Durchführung des Verfahrens
DE102017201929A1 (de) 2017-02-08 2018-08-09 Dürkopp Adler AG Doppelsteppstich-Nähmaschine sowie Verfahren zur Erzeugung eines Naht-Anfangsoberfadens mit einem geringen Soll-Nahtüberstand
DE102017207626A1 (de) * 2017-05-05 2018-11-08 Dürkopp Adler AG Verfahren zum Erzeugen eines Naht-Endunterfadens mit vorgegebenem Soll-Nahtüberstand
DE102017207627A1 (de) * 2017-05-05 2018-11-08 Dürkopp Adler AG Baugruppe zum Erzeugen eines Naht-Anfangsoberfadens mit einem Soll-Nahtüberstand

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009004218A1 (de) * 2009-01-09 2010-07-15 Dürkopp Adler AG Fadenschneidvorrichtung für eine Nähmaschine
TWM365364U (en) 2009-03-12 2009-09-21 Chee Siang Ind Co Ltd Automatic thread-cutting device of sewing machine
DE202016104320U1 (de) 2015-10-12 2016-09-19 Xi'an Typical Europe Gmbh Nähmaschine
CN107214327B (zh) * 2017-07-14 2023-08-01 山东钢铁股份有限公司 一种连铸中间包条形气幕挡墙及其安装方法
CN109265150B (zh) * 2018-10-15 2021-06-29 郑州市瑞沃耐火材料有限公司 加热炉用预制滑轨砖

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1941794A1 (de) * 1969-08-16 1971-03-18 Pfaff Ag G M Fadenschneideinrichtung an Doppelsteppstichnaehmaschinen
DE3208159C2 (de) * 1982-03-06 1984-03-01 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Fadenschneideeinrichtung an Doppelsteppstich-Nähmaschinen
DE19722395C1 (de) * 1997-05-28 1998-08-06 Pfaff Ag G M Nähmaschine mit einer Fadenschneideinrichtung
DE10035819C1 (de) * 2000-07-22 2001-11-15 Duerkopp Adler Ag Greifer für eine Doppelsteppstich-Nähmaschine mit einer Fadenabschneidvorrichtung
DE10117560C1 (de) * 2001-04-07 2002-07-25 Duerkopp Adler Ag Doppelsteppstichnähmaschine mit einer Drehsicherung für ein Spulengehäuse
DE10123075C1 (de) * 2001-05-11 2002-10-10 Duerkopp Adler Ag Doppelsteppstichnähmaschine mit einer Fadenabschneidvorrichtung

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2692925A1 (fr) 2012-08-01 2014-02-05 Dürkopp Adler AG Couteau à tirer le fil pour une machine à coudre, module de coupe de fil et machine à coudre dotée d'un tel couteau à tirer le fil
DE102012213599A1 (de) 2012-08-01 2014-02-06 Dürkopp Adler AG Fadenziehmesser für eine Nähmaschine, Fadenabschneid-Baugruppe sowie Nähmaschine mit einem derartigen Fadenziehmesser
DE102015223194B3 (de) * 2015-11-24 2017-02-23 Dürkopp Adler AG Verfahren zum Erzeugen eines Naht-Anfangsoberfadens mit kurzem Soll-Nahtüberstand sowie Baugruppe zur Durchführung des Verfahrens
EP3176296A1 (fr) 2015-11-24 2017-06-07 Dürkopp Adler AG Procédé de production d'un fil supérieur de démarrage de couture ayant un faible rentré théorique de couture et ensemble destiné à exécuter le procédé
DE102017201929A1 (de) 2017-02-08 2018-08-09 Dürkopp Adler AG Doppelsteppstich-Nähmaschine sowie Verfahren zur Erzeugung eines Naht-Anfangsoberfadens mit einem geringen Soll-Nahtüberstand
DE102017207626A1 (de) * 2017-05-05 2018-11-08 Dürkopp Adler AG Verfahren zum Erzeugen eines Naht-Endunterfadens mit vorgegebenem Soll-Nahtüberstand
DE102017207627A1 (de) * 2017-05-05 2018-11-08 Dürkopp Adler AG Baugruppe zum Erzeugen eines Naht-Anfangsoberfadens mit einem Soll-Nahtüberstand

Also Published As

Publication number Publication date
DE202006009410U1 (de) 2007-08-30
ATE457381T1 (de) 2010-02-15
JP2007289692A (ja) 2007-11-08
KR20070104240A (ko) 2007-10-25
DE502007002792D1 (de) 2010-03-25
KR101389651B1 (ko) 2014-04-29
EP1847641A1 (fr) 2007-10-24

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