EP2692925B1 - 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 - Google Patents

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 Download PDF

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Publication number
EP2692925B1
EP2692925B1 EP20130177798 EP13177798A EP2692925B1 EP 2692925 B1 EP2692925 B1 EP 2692925B1 EP 20130177798 EP20130177798 EP 20130177798 EP 13177798 A EP13177798 A EP 13177798A EP 2692925 B1 EP2692925 B1 EP 2692925B1
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EP
European Patent Office
Prior art keywords
thread
blade
shuttle
sewing machine
drawing blade
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Application number
EP20130177798
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German (de)
English (en)
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EP2692925A1 (fr
Inventor
Radomir Humplik
Christoph Heckner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Duerkopp Adler AG
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Duerkopp Adler AG
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Publication of EP2692925A1 publication Critical patent/EP2692925A1/fr
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    • 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 thread-pulling knife for a sewing machine according to the preamble of claim 1. Furthermore, the invention relates to a thread trimming assembly and a sewing machine with such a thread-pulling knife.
  • a thread-pulling knife of the type mentioned is known from the EP 1 847 641 B1 , A thread trimmer for a zigzag stitch-producing sewing machine is described in U.S. Patent Nos. 4,178,055 US 4,455,957 , The US 4,879,960 discloses a thread cutting system for an inline chain stitch sewing machine.
  • Thread-pulling knives can be designed for sewing machines with grippers, which are rotatable about horizontal or vertical gripper axes.
  • the thread-pulling knife is regularly designed to cut both an upper thread and a looper thread, so that at the end of a seam formation both threads can be automatically cut off. If thick threads are to be sewn, which is often the case when sewing very resistant sewing material, the known thread-pulling knives sometimes no longer work reliably.
  • two separately arranged thread detection grooves for correspondingly separate detection of the upper thread on the one hand and the looper thread on the other hand offer the possibility of cutting both threads without the two threads converge uncontrolled when cutting and hinder each other in the worst case.
  • the separate thread detection enables a safe cutting of both threads even if thick thread types are used during sewing.
  • the thread-pulling knife pivot axis can run parallel to the gripper axis.
  • the thread detection grooves can open to the same direction.
  • the design of the thread-pulling knife for a sewing machine with a horizontally extending gripper axis is particularly suitable for a sewing machine designed for sewing heavy or durable material, for example leather or plastic plates.
  • An arrangement of the two thread-detecting grooves according to claim 2 allows due to the intermediate blade base body a compulsory separation of detection areas for the upper thread on the one hand and the looper thread on the other hand, resulting in a reliable thread detection.
  • a thread-pulling knife according to claim 3 allows a thread trimming close to a stitch pattern location, so that short thread ends remain on the fabric.
  • An arcuate design of the thread-pulling knife according to claim 4 ensures that a base body or a supporting body of the thread-pulling knife interfere with the yarn path as little as possible.
  • Staggered cutting edges of the thread-detecting grooves according to claim 5 reduce a maximum occurring cutting or shearing force when cutting the two threads.
  • Another object of the invention is to equip a sewing machine with such a thread-pulling knife.
  • the counter knife may be integrally provided with a common cutting edge which cooperates with the two bottom cutting edges of the thread detecting grooves, or may be equipped with two separately formed cutting edges each associated with the bottom cutting edge in the thread detecting groove. In the case of two separate cutting of the counter knife this can be carried out in two parts.
  • a sewing machine 1 has a base plate 2 with a stand 3 extending upward therefrom and an angled arm 4.
  • the sewing machine 1 is designed for sewing heavy or durable sewing material, for example leather or plastic plates.
  • the arm 4 ends in a head 5.
  • arm shaft 6 rotatably mounted.
  • This drives in the head 5, which is not set forth, a crank mechanism with a thread lever.
  • the crank mechanism is drivingly connected to a needle bar 9 axially slidably mounted in the head 5 in connection, of which in the Fig. 1 only a lower section is shown.
  • This has at its lower end a needle 10.
  • the needle 10 is moved up and down by the crank mechanism on a vertical axis 9a.
  • the needle 10 leads in an eye from a spool via a thread tensioning device and the thread lever supplied needle thread or upper thread 11, which is also shown only in sections in the drawing.
  • a gripper 12 having a gripper body with a gripper tip 12a.
  • the gripper 12 is designed as a Barell gripper.
  • a cylindrical storage housing 12b is mounted for receiving a looper thread supply.
  • a cylinder axis of the storage housing 12b is perpendicular to a rotational axis of the gripper 12.
  • the storage housing 12b is designed to receive a bobbin.
  • the storage housing 12b is therefore also referred to as a coil housing.
  • the gripper 12 is rotatable about a horizontal gripper axis 13.
  • a gripper or lower thread 14 serves a Fadenabschneid assembly 15, which in the Fig. 2 in a thread trimming position and in the Fig. 3 is shown in a basic position.
  • the two threads 11, 14 have in the sewing of durable fabric a considerable thickness, which may be, for example, 1 mm and more.
  • the Fadenabschneid assembly 15 has a movable between the Fadenabschneid too and the basic position thread-pulling knife 16 and a fixed to a frame, so for example the base plate 2, the sewing machine 1 connected counter knife 17. Between the basic position and the Fadenabschneid ein is a thread detection position of the thread pulling knife 16. Das The thread-pulling knife 16 is pivotable adjacent to the gripper 12 and to the spool housing 12b.
  • the thread-pulling knife 16 is arcuately executed about a pivot axis 18 about which the thread-pulling knife 16 of the displacement between the basic position and the Fadenabschneid ein is pivotable.
  • the thread-pulling knife 16 has an arc-shaped carrier body 19, with which a likewise curved knife body 20 of the thread-pulling knife 16 is screwed by means of a mounting bracket 21.
  • the carrier body 19 is arcuately formed so that it is arranged in the assembled basic position around the gripper 12 around.
  • the thread-pulling knife carrier body 19 is rotatably connected to a blade shaft 22 which extends along the pivot axis 18 in the base plate 2 parallel to the arm shaft 6.
  • a pivot axis of the thread-pulling knife carrier body 19 extends parallel to the gripper axis 13.
  • the gripper axis is vertical.
  • the pivot axis of the thread-pulling knife carrier body is vertical.
  • the arrangement of the thread-pulling knife 16 and the counter knife 17 is rotated in the case of a vertical gripper axis by 90 ° so that the cutting edges of the thread-pulling knife 16 and the counter blade 17 cooperating with each other during thread cutting are substantially vertical in this alternative embodiment.
  • the blade shaft 22 is mechanically coupled to a blade drive shaft 24, which is also housed parallel to the arm shaft 6, at the transition between the stator 3 and the arm 4.
  • a drive movement of the knife drive shaft 24 is derived from the arm shaft 6 via a cam 24 a, which is rotatably connected to the arm shaft 6.
  • a lift cylinder 24b provides controlled displacement of the thread trimmer mechanism between a neutral position, in which the cam disc 24a remains ineffective, and a thread trimmer operating position in which the cam plate 24a acts to drive a cutting movement of the thread pulling knife 16.
  • the thread-pulling knife 16 has two separately arranged thread-detecting grooves 25, 26, each having a cutting edge with respective cutting edge 26a.
  • the cutting edges 26a represent edge transitions between the thread-detecting grooves 25 and 26 on the one hand and an upper side of the thread-pulling knife 16 on the other hand Fig. 3
  • Thread detection groove 26 shown above is used to detect the upper thread 11 and in the Fig. 3
  • the thread detection groove 25 shown below is used to detect the lower thread 14.
  • the two thread detection grooves 25, 26 are arranged on both sides of a knife base 27 of the thread pulling knife 16.
  • the two thread-detecting grooves 25 and 26 open to the same direction, namely, as seen from a free end of the thread pulling knife 16 in the basic position, in the direction of movement of the thread pulling knife 16 for thread detection position and the cutting position.
  • the counter-blade 17 is adjustably screwed in position with a bearing block 28, which in turn is bolted to the frame of the sewing machine 1.
  • the thread clamp 29 clamps the bobbin-side lower thread 14, which is pulled around the thread pulling knife 16 during cutting, after cutting, so that its position remains defined after deposition. This facilitates sewing and prevents a loose end of the lower thread 14 from entering a later trajectory of the gripper.
  • FIG. 5 The exploded view after Fig. 5 further shows a screw 30 with countersunk head for attachment of the counter blade 17 to an upper bearing surface 31 of the bearing block 28.
  • the screw 30 is screwed for this purpose in a thread 32, which is executed in the contact surface 31.
  • a ball cap 33 is arranged, which is designed to match a conical socket 34 in a screw passage opening 35 of the counter blade 17.
  • a threaded pin 36 is arranged for adjusting the counter blade 17.
  • a cutting relative position of a cutting edge 38 of the counter blade 17 to the cutting edges 26a of the thread pulling knife 16 can be specified.
  • a cutting pressure during the thread cutting between the cutting edges 26a and 38 is generated by a radius of the knife main body 27 rising to the cutting point in the region of the thread-detecting grooves 25, 26.
  • the sewing machine 1 operates as follows: In the normal sewing operation, the thread-pulling knife 16 is in the home position. With the help of the gripper and the needle 10 in a known manner looping and knotting of looper thread 14 and needle thread 11 for seam formation. At the end of the seaming operation, a thread trimming operation is initiated for both threads 11, 14. For this purpose, a knife drive is actuated, via the knife drive shaft 24, the pull rod 23, the knife shaft 22, a pivoting of the thread pulling knife 16 from the basic position in the Thread trimming position causes. Here, the thread-pulling knife 16 passes through the thread-detecting position, in which the thread-detecting groove 25, the upper thread 11 and the thread-detecting groove 26 detects the lower thread 14.
  • the counter knife 17 With covered in the grooves 25, 26 threads 11, 14, the counter knife 17 then reaches the Fadenabschneidleton in which the threads 11, 14 between the cutting edges 26a of the thread pulling knife 16 and the cutting edge 38 of the counter blade 17 are sheared.
  • the thread-pulling knife 16 then returns, again driven by the components 22 to 24, in the normal position.
  • FIGS. 7 and 8 Two further embodiments of a thread trimming assembly with a thread-pulling knife and a counter knife are explained below. Components corresponding to those described above with reference to the thread trimming assembly according to the Fig. 1 to 6 already described, bear the same reference numbers and will not be discussed again in detail.
  • the cutting edge 38 of the counter blade 17 is inclined relative to a connecting line 39 between the two cutting edges 26a of the thread-detecting grooves 25, 26.
  • the counter knife cutting edge 38 encloses an angle ⁇ of 8 ° with the connecting line 39 in the area of the thread cutting position.
  • the execution after Fig. 7 closes the cutting edge 38 of the counter blade 17 with a movement direction 40 of Fadenabschneid movement of the thread-pulling knife 16 relative to the counter blade 17 a right angle.
  • the oblique course of the counter knife cutting edge 38 to the connecting line 39 of the two cutting edges 26a is thus due to the fact that the two cutting edges 26a of the thread detection grooves 25, 26 are arranged offset in the direction of movement 40 to each other. In absolute terms, this offset can be, for example, in the range of 1 mm to 2 mm.
  • the counter-blade cutting edge 38 is not perpendicular to the direction of movement 40 of the thread-pulling knife 16, but takes this to a minimum angle ⁇ , which is smaller than 88 ° and in the illustrated embodiment is about 78 °.
  • the thread-pulling knife 16 is in the execution after Fig. 8 also with regard to the arrangement of the cutting edges 26 a executed exactly as the thread-pulling knife 16 after Fig. 6 , The cutting edges 26a are after the thread-pulling knife 16 after Fig. 8 in the direction of movement 40 so not offset from each other.

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

Claims (9)

  1. Couteau à tirer le fil (16), destiné à une machine à coudre (1), la machine à coudre (1) comprenant une arrivée de fil supérieur et une griffe (12) pouvant être mise en rotation autour d'un axe (13) de griffe, griffe qui présente un corps de griffe, qui porte un magasin de réserve (12b) pour l'admission d'une réserve de fil pour la griffe,
    caractérisé en ce que
    - le couteau à tirer le fil (16) peut être pivoté autour d'un axe de pivotement (18) entre une position de base et une position de capture du fil,
    - le couteau à tirer le fil (16) présente deux languettes de capture de fil (25, 26) agencées séparées l'une de l'autre, comprenant chacune un bord coupant (26a), notamment, une languette de capture du fil (26) pour la saisie du fil supérieur (11) et une languette de capture de fil (25) pour la saisie du fil de la griffe (14),
    - le couteau à tirer le fil (16) est conçu pour une machine à coudre (1) comportant un axe (13) de griffe s'étendant horizontalement.
  2. Couteau à tirer le fil selon la revendication 1, caractérisé en ce que les deux languettes de capture du fil (25, 26) sont disposées des deux côtés d'un corps de base de couteau (27) du couteau à tirer le fil (16).
  3. Couteau à tirer le fil selon les revendications 1 ou 2, caractérisé par une conception telle que le couteau à tirer le fil (16) peut être pivoté au voisinage de la griffe (12).
  4. Couteau à tirer le fil selon l'une des revendications 1 à 3, caractérisé en ce que le couteau à tirer le fil (12) est conçu sous la forme d'un arc de cercle de sorte qu'il est agencé autour de la griffe (12) dans la position de base montée.
  5. Couteau à tirer le fil selon l'une des revendications 1 à 4, caractérisé en ce que les bords coupants (26a) des deux languettes de capture de fil (25, 26) sont agencées espacées l'une de l'autre dans la direction de déplacement (40) du couteau à tirer le fil (16).
  6. Module de coupe de fil destiné à une machine à coudre (1) comprenant un couteau à tirer le fil (16) selon l'une des revendications 1 à 5 et comprenant un couteau complémentaire (17) disposé fixé au châssis, agissant conjointement avec le couteau à tirer le fil (16).
  7. Module de coupe de fil selon la revendication 6, caractérisé en ce qu'un bord de coupe (38) du couteau complémentaire (17) s'étend oblique par rapport à une ligne de liaison (39) entre les deux bords coupants (26a) des languettes de capture de fil (25, 26).
  8. Module de coupe de fil selon les revendications 6 ou 7, caractérisé en ce que le bord de coupe (38) du couteau complémentaire (17) décrit un angle (α) le plus petit, qui est inférieur à 88 °, pour la direction du déplacement (40) du couteau à tirer le fil (16).
  9. Machine à coudre (1)
    - comprenant un châssis,
    - comprenant une arrivée de fil supérieur,
    - comprenant une griffe (12), pouvant être mise en rotation autour d'une axe (13) de griffe, griffe qui présente un corps de griffe dans lequel est logé un magasin de réserve (12b) pour l'admission d'une réserve de fil pour la griffe, caractérisée par un module de coupe de fil selon l'une des revendications 6 à 8.
EP20130177798 2012-08-01 2013-07-24 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 Active EP2692925B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012213599.5A DE102012213599A1 (de) 2012-08-01 2012-08-01 Fadenziehmesser für eine Nähmaschine, Fadenabschneid-Baugruppe sowie Nähmaschine mit einem derartigen Fadenziehmesser

Publications (2)

Publication Number Publication Date
EP2692925A1 EP2692925A1 (fr) 2014-02-05
EP2692925B1 true EP2692925B1 (fr) 2014-11-12

Family

ID=48875560

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20130177798 Active EP2692925B1 (fr) 2012-08-01 2013-07-24 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

Country Status (6)

Country Link
EP (1) EP2692925B1 (fr)
JP (1) JP3186538U (fr)
KR (1) KR200486535Y1 (fr)
CN (1) CN203546369U (fr)
DE (1) DE102012213599A1 (fr)
TW (1) TWM481936U (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN109695105B (zh) * 2019-01-25 2024-03-22 林泽贤 剪线组件、剪线装置及缝纫机
DE202019102567U1 (de) 2019-05-08 2020-08-11 Dürkopp Adler AG Nähmaschine sowie Gegenmesser-Baugruppe für eine Maschine
CN112877930B (zh) * 2021-01-13 2022-09-09 徐州力达缝纫设备制造有限公司 一种缝纫机剪线抬压脚结构及缝纫机

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2070029A (en) * 1935-10-04 1937-02-09 Singer Mfg Co Thread-cutter for sewing machines
DE3124795C1 (de) * 1981-06-24 1982-11-04 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Fadenabschneidvorrichtung fuer Zickzack-Naehmaschinen
US4566395A (en) * 1984-11-05 1986-01-28 Clinton Industries, Inc. Sewing machine needle thread capturing and severing mechanism
JPS62298393A (ja) * 1986-06-19 1987-12-25 ペガサスミシン製造株式会社 シリンダ−ミシンの糸切断装置
US4879960A (en) * 1988-07-22 1989-11-14 Kansai Special Usa Corp. Thread trimmer system for in-line chain stitch sewing machine
JP2584981Y2 (ja) * 1992-06-30 1998-11-11 ジューキ株式会社 ミシンの糸切り装置
US5333565A (en) * 1992-10-30 1994-08-02 Mim Industries, Inc. Thread cutting via reciprocating arm with pockets and a trimming plate
TW309026U (en) * 1996-12-27 1997-06-21 Kaulin Mfg Co Ltd Adjustable fan-swinging structure
DE202006009410U1 (de) 2006-04-21 2007-08-30 Dürkopp Adler AG Fadenziehmesser für eine Nähmaschine

Also Published As

Publication number Publication date
DE102012213599A1 (de) 2014-02-06
EP2692925A1 (fr) 2014-02-05
TWM481936U (zh) 2014-07-11
KR200486535Y1 (ko) 2018-05-31
KR20140000955U (ko) 2014-02-11
JP3186538U (ja) 2013-10-10
CN203546369U (zh) 2014-04-16

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