EP0048293B1 - Procédé et dispositif pour l'exécution d'une couture surjetée au moyen d'une machine à coudre zigzag - Google Patents

Procédé et dispositif pour l'exécution d'une couture surjetée au moyen d'une machine à coudre zigzag Download PDF

Info

Publication number
EP0048293B1
EP0048293B1 EP80105642A EP80105642A EP0048293B1 EP 0048293 B1 EP0048293 B1 EP 0048293B1 EP 80105642 A EP80105642 A EP 80105642A EP 80105642 A EP80105642 A EP 80105642A EP 0048293 B1 EP0048293 B1 EP 0048293B1
Authority
EP
European Patent Office
Prior art keywords
needle
mandrel
thread
oversewing
stripper
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.)
Expired
Application number
EP80105642A
Other languages
German (de)
English (en)
Other versions
EP0048293A1 (fr
Inventor
Helmar Holl
Rolf Kessler
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.)
Dorina Nahmaschinen GmbH
Original Assignee
Dorina Nahmaschinen GmbH
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
Application filed by Dorina Nahmaschinen GmbH filed Critical Dorina Nahmaschinen GmbH
Priority to EP80105642A priority Critical patent/EP0048293B1/fr
Priority to DE8080105642T priority patent/DE3067167D1/de
Priority to JP56132220A priority patent/JPS5772690A/ja
Priority to US06/297,415 priority patent/US4391214A/en
Publication of EP0048293A1 publication Critical patent/EP0048293A1/fr
Application granted granted Critical
Publication of EP0048293B1 publication Critical patent/EP0048293B1/fr
Expired legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B93/00—Stitches; Stitch seams
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B3/00—Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing
    • D05B3/02—Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing with mechanisms for needle-bar movement
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers

Definitions

  • the method known from DE-AS 28 52 299 for forming an overlock seam with the aid of a zigzag sewing machine provides that the needle bar after forming a first loop of needle and looper thread in a first stitching position to form a further thread looping in a second stitching position changes, whereby the needle thread is placed over a sewing mandrel and thereby loosened. At least one straight stitch is then formed in the second stitching position of the needle bar, whereupon the needle thread leading from the first to the second thread looping is pulled out into a loop when the needle bar is subsequently changed into the first stitching position, the needle is presented for the stitching and then released. The needle bar is changed to the other overstitch position when the material feed is suspended.
  • the piece of thread is pulled out between the first and second thread loops while reversing the material feed direction.
  • the progressive seam formation is achieved exclusively by performing at least one straight stitch within a basic formation of the overlock seam formed from at least four stitches.
  • the feed pauses or the execution of a reverse stitch result in a not inconsiderable delay in the progressive seam formation, so that the effective feed speed and thus the sewing time are negatively influenced.
  • This method can only be carried out efficiently on zigzag sewing machines which are equipped with control means for the needle bar and the fabric pusher.
  • the overlocking mandrel which serves to loosen and pull out the needle thread leading from the first to the second thread interlacing of a basic formation of the overlock seam, is hook-shaped at its free end in order to prevent the needle thread to be pulled out from slipping off.
  • the security against slipping is not sufficient when using stiff and smooth threads. Slipping off the hook could largely prevent it from slipping off, but this would then cause difficulties when stripping the pulled-out thread loop.
  • the oversewing mandrel of the known device is moved past the front edge of a loop stripper bar attached to the presser of the sewing machine.
  • the thread stress would increase to an unacceptable degree when stripping the thread loop in the known device.
  • the object of the invention which is summarized in the claims, is to develop a method and a device for carrying it out which make it possible to produce an overlock seam much more quickly, ensure gentle thread treatment and full security against the thread loop to be pulled off slipping off the overlocking mandrel and allow it to make the overlock seam on any normal zigzag sewing machine.
  • the overlock seam can be sewn using the new method at the same feed rate as a normal zigzag seam.
  • the thread loop is placed through the details specified in claims 2 and 3 when sewing both over the sewing mandrel and over the stripper, it can therefore be lifted and released very easily and gently from the sewing mandrel.
  • the measure according to claims 2 and 3 results in a particularly simple control of the scraper derived from the axial movement of the needle bar.
  • the eyelet is opened in a very simple manner for the entry of the thread loop and closed for pulling out.
  • the device is suitable as an additional device for any normal zigzag sewing machine.
  • the presser bar 21 and needle bar 22, which are under spring action, are arranged.
  • a needle holder 23 is arranged, in which the needle 26 is fastened by means of a fastening screw 25 having a cylinder head 24 and which cooperates with a thread-guiding gripper 28 arranged under the needle plate 27 to form double lockstitches.
  • the needle bar 22 are issued in a known manner, vertical up and down movements and optionally transverse movements between the overstitch positions indicated by and II, FIGS. 1 and 2.
  • the stitch plate 27 of the sewing machine which is provided with a passage slot for the needle 26, has two longitudinal slots 29, through which the toothed webs 30 of the fabric pusher 31, which performs a square movement in the usual manner, for upward movement of the material pass.
  • the shaft 33 is fastened by means of a wing screw 34 to the lower end of the presser bar 21, which is pressed downwards by a presser spring, not shown.
  • the shaft 33 has an opening 35 through which the one bearing web (36) of a bearing bracket 38 formed with two angularly bent bearing webs 36 and 37 is carried out and in which a shaft 39 is rotatably and longitudinally displaceably mounted.
  • the bearing bracket 38 is fastened in the shaft 33 by means of a screw, not shown.
  • the shaft 39 / bearing web 36 connects the shaft 39 to all vertical movements of the presser.
  • an angle bracket 40 is fastened by means of a screw 41, FIG. 3.
  • the shaft 39 is axially secured by a feeler 42 fastened to its upper end and a snap ring 43, FIGS. 1 and 2.
  • a torsion spring 44 is arranged on the shaft 39, which has two free legs 45 and 46, of which one, 45, is supported on the bearing web 36 and the other, 46, engages on the angle bracket 40.
  • the bearing bracket 38 is fastened by screws 47 to a housing 48 which encloses the parts of the device and, for better assembly, can be constructed in several parts.
  • the feeler lever 42 has a bent-up free end 50, which projects through a recess 49 in the housing 48 and has an oblique contact surface 51, FIG. 3, which cooperates with the needle bar 22 in order to rotate the shaft 39.
  • a sewing mandrel 52 is formed on the angular support 40, which has an upwardly bent retaining lug 53 for the needle thread loop and projects through an opening in the housing 48 to the outside beyond the needle passage slot.
  • the angle bracket 40 is pressed by the torsion spring 44 with the sewing mandrel 52.
  • the end position is determined by an adjustable stop screw 55 which is arranged in a tab 54 of the bearing bracket 38 and which interacts with a shoulder 56, FIG. 3, of the feeler lever 42.
  • a stripper 58 designed as a two-armed lever for the needle thread loop is pivotably mounted on an angularly bent-up bearing web 57 of the angle support 40 about a stud screw 59, FIG. 3.
  • One arm 60 protrudes toward the needle 26. Its front end is arranged parallel to the sewing mandrel 52 and is a complement to this.
  • the other arm 61 of the scraper 58 projects obliquely upwards. Its end is bent in an L-shape and the free web 62 has an inclined contact surface 63 which, in the overstitch position I of the needle bar 22, projects into the movement path of the cylinder head 24 of the needle fastening screw 25.
  • the stripper 58 runs with the front end of its arm 60 onto a contact surface 69 of the presser sole 32, as a result of which the arm 60 and thus the holding member 65 are slightly raised, so that between the holding nose 53 and the holding member 65 Gap arises through which a needle thread loop placed over the holding member 65, the sewing mandrel 52 and the arm of the stripper 58 can enter and thus reaches behind the holding nose 53 of the sewing mandrel 52.
  • the gap for pulling out the needle thread loop - as shown in FIG. 5 - is closed by the spring 67, so that the overlocking mandrel 52 and the holding slide 65 practically form an eyelet. In the release position for the thread loop (FIG.
  • the stripper 58 is pivoted against the action of the leg spring 67 by running the cylinder head 24 of the screw 25 onto the sliding surface 63 against the action of the leg spring 67, the arm 60 of the stripper 58 reaching over the retaining lug 53 of the sewing mandrel 52 is raised and the holding member 65 is lifted off the holding lug 53.
  • the pulled-out needle thread loop can slide freely over the retaining lug 53.
  • a ruler 70 is provided on the presser sole 32 for guiding the side edge of the sewing material W. attached a downwardly angled guide web 71.
  • the shaft 39 is supported for stabilization in a bearing bracket 72, which is fastened with its foot part to the throat plate 27 of the sewing machine with the aid of a knurled screw 74 secured against being lost by a clamping ring 73.
  • the base part of the bearing bracket 72 has a rib 75 on the underside which engages in a recess 76 in the throat plate 27.
  • the needle 26 pierces the needle bar 22 to form the first interlacing of needle and looper thread NF or GF at point 1, FIG. 7, in the overstitch position I, FIGS. 1, 2 , the ends of the threads being held in place by the seamstress at the start of sewing.
  • the needle bar 22 changes to the overstitch position II by shifting the sewing material W by a stitch length through the fabric slide 31 to insert the needle 26 at point 2.
  • the overlocking mandrel 52, the arm 60 of the stripper 58 and the holding member 65 take theirs 5 a position shown, while the shaft 39 carrying the feeler lever 42 and the angle bracket 40 with the device parts follows the oscillating movement of the needle bar 22 under the action of the leg spring 44 and the needle thread NF reaching to point 1 via the holding member 65, the overlocking mandrel 52 and the arm 60 of the scraper 58 is placed so that it has a greater length than the Strekce 1-2.
  • the arm 60 of the scraper 58 runs with the free end onto the contact surface 69 of the presser sole 32, whereby the arm 60 of the scraper 58 and thus also the holding member 65 are raised somewhat, so that As shown in FIG. 4, a gap is formed between the free end of the holding slide 65 and the holding nose 53, through which the needle thread NF passes during the downward movement of the needle bar 22 and passes behind the holding nose 53.
  • the needle bar 22 changes again into the overstitch position 1, the material W being advanced by a further stitch length in the direction of the arrow V to insert the needle 26 at 3, FIG. 7, while the needle 26 is outside the sewing material W.
  • the shaft 39 is rotated with the overlocking mandrel 52 arranged thereon, the stripper 58 and the holding member 65 against the action of the torsion spring 44 via the feeler lever 42 interacting with the needle bar 22.
  • the arm 60 of the scraper 58 runs from the contact surface 69 of the presser sole 32 and the scraper 58 is pivoted counterclockwise by the leg spring 67 - with reference to FIG. 3 - about the stud screw 59, so that the gap between the retaining lug 53 and the holding member 65 is closed.
  • the needle thread NF extending from the first to the second interlacing is drawn out into a loop and presented in the overstitch position of the needle 26 for the puncture.
  • the cylinder head 24 of the needle fastening screw 25 hits the contact surface 63 of the web 61 of the scraper 58 and pivots this together with the holding member 65 - based on FIG. 3 - in Clockwise around the stud screw 59 with the upper edge of the arm 60 engaging on the thread loop up to the retaining lug 53 (see FIG. 6).
  • the thread loop can slide freely over the holding nose 53 during the so-called stitch pull-in movement of the usual thread lever of the sewing machine.
  • any normal zigzag sewing machine can be used to carry out the method using the new device.

Claims (7)

1. Procédé pour la formation d'un surjet au moyen d'une machine à coudre en zigzags (20) dans laquelle, après la formation d'un premier noeud des fils d'aiguille et de boucleur (NF et GF) dans une première position de surjet (I) de la barre à aiguille (22) et après un déplacement, associé à un relâchement du fil d'aiguille (NF), de la barre à aiguille (22) dans une deuxième position de surjet (II), il y a formation d'un autre noeud de fils, le fil d'aiguille (NF) qui va du premier au deuxième noeud étant tiré, en formant une boucle, dans la première position de surjet (I), cette boucle se présentant de manière que l'aiguille (26) y pénètre pour le point suivant et étant ensuite libérée, caractérisé en ce que tout passage de la barre à aiguille (22) d'une position de surjet s'accompagne d'un déplacement de la pièce à coudre (W) dans le sens de l'avance (flèche 5) d'une quantité égale à la longueur d'un point.
2. Dispositif pour la mise en oeuvre du procédé selon la revendication 1, comportant un mandrin de surjet (52) qui effectue deux mouvements successifs et un organe de dégagement (58) de la boucle de fil, caractérisé en ce que l'organe de dégagement (58) est dans l'une des positions de surjet (II), placé parallèlement et à proximité immédiate du mandrin de surjet (52) et constitue un complément de ce mandrin de surjet (52) et, dans l'autre position de surjet (I), se place, sous l'action de la barre d'aiguille (22) dans une position de dégagement du fil.
3. Dispositif selon la revendication 2, caractérisé en ce que l'organe de dégagement (58) est monté de manière à pouvoir pivoter sur le mandrin de surjet (52) et a la forme d'un levier à deux bras (60, 61) dont l'un des bras (60) constitue le complément du mandrin de surjet (52) et dont l'autre bras (61) se place, dans l'une des positions de surjet (I), sur le trajet de la barre à aiguille (22).
4. Dispositif selon les revendications 2 et 3, caractérisé en ce que le premier bras (60) de l'organe de dégagement (58) comporte une pièce de maintien (55) de la boucle de fil, qui peut se déplacer de manière que son extrémité libre reste au contact du mandrin de surjet (52).
5. Dispositif selon les revendications 2 à 4, caractérisé en ce que l'extrémité libre de l'organe de maintien (65) peut se soulever en s'écartant du mandrin de surjet (52), dans la deuxième position de surjet (II) de la barre à aiguille (22), du fait que l'organe de dégagement (58) se déplace sur une surface de glissement (69) du pied presseur (32).
6. Dispositif selon les revendications 2 et 5, caractérisé en ce qu'il est logé dans une enveloppe (48) qui lui est propre et est relié au pied presseur d'étoffe (32).
7. Dispositif selon les revendications 2 à 6, comportant un arbre (39) portant un mandrin de surjet (52), caractérisé en ce que cet arbre (39) est monté dans un étrier (38) faisant saillie dans l'enveloppe (48) et placé sur la plaque de couture (27) de la machine à coudre (20) et est relié, en même temps que l'enveloppe (48), par l'intermédiaire d'une pièce d'entraînement (36), au pied presseur (32/33).
EP80105642A 1980-09-19 1980-09-19 Procédé et dispositif pour l'exécution d'une couture surjetée au moyen d'une machine à coudre zigzag Expired EP0048293B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP80105642A EP0048293B1 (fr) 1980-09-19 1980-09-19 Procédé et dispositif pour l'exécution d'une couture surjetée au moyen d'une machine à coudre zigzag
DE8080105642T DE3067167D1 (en) 1980-09-19 1980-09-19 Method and device for producing an overedge seam with the aid of a zigzag sewing machine
JP56132220A JPS5772690A (en) 1980-09-19 1981-08-25 Method and apparatus for forming overhang stitch by zigzag sewing machine
US06/297,415 US4391214A (en) 1980-09-19 1981-08-28 Method and device for forming an overcast seam by means of a zigzag sewing machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP80105642A EP0048293B1 (fr) 1980-09-19 1980-09-19 Procédé et dispositif pour l'exécution d'une couture surjetée au moyen d'une machine à coudre zigzag

Publications (2)

Publication Number Publication Date
EP0048293A1 EP0048293A1 (fr) 1982-03-31
EP0048293B1 true EP0048293B1 (fr) 1984-03-21

Family

ID=8186804

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80105642A Expired EP0048293B1 (fr) 1980-09-19 1980-09-19 Procédé et dispositif pour l'exécution d'une couture surjetée au moyen d'une machine à coudre zigzag

Country Status (4)

Country Link
US (1) US4391214A (fr)
EP (1) EP0048293B1 (fr)
JP (1) JPS5772690A (fr)
DE (1) DE3067167D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0230596U (fr) * 1988-08-18 1990-02-27
CH712437A1 (de) * 2016-05-06 2017-11-15 Bernina Int Ag Nähmaschine umfassend eine Vorrichtung zum manuellen Wechseln eines Transporteurs.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2811455A1 (de) * 1977-03-14 1978-09-21 Mefina Sa Verfahren zur anfertigung einer naht nahe beim rand eines gewebes zur verhinderung seiner ausfaserung
EP0011689A1 (fr) * 1978-12-02 1980-06-11 Dorina Nähmaschinen GmbH Procédé et dispositif pour l'exécution d'un surjet au moyen d'une machine à coudre zig-zag

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1509111A (en) * 1922-06-21 1924-09-23 Roger N Saleeby Seam
US2973731A (en) * 1955-05-31 1961-03-07 Man Sew Corp Compound stitching device
US2849976A (en) * 1957-06-19 1958-09-02 Sanseverinati Joseph Sewing method and apparatus
US3126850A (en) * 1961-05-08 1964-03-31 Safety stitch sewing machines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2811455A1 (de) * 1977-03-14 1978-09-21 Mefina Sa Verfahren zur anfertigung einer naht nahe beim rand eines gewebes zur verhinderung seiner ausfaserung
EP0011689A1 (fr) * 1978-12-02 1980-06-11 Dorina Nähmaschinen GmbH Procédé et dispositif pour l'exécution d'un surjet au moyen d'une machine à coudre zig-zag

Also Published As

Publication number Publication date
JPS6225395B2 (fr) 1987-06-02
JPS5772690A (en) 1982-05-07
DE3067167D1 (en) 1984-04-26
US4391214A (en) 1983-07-05
EP0048293A1 (fr) 1982-03-31

Similar Documents

Publication Publication Date Title
DE3124795C1 (de) Fadenabschneidvorrichtung fuer Zickzack-Naehmaschinen
DE3116931A1 (de) Vorrichtung zum ausziehen und abschneiden der faeden an einer naehmaschine
EP0048293B1 (fr) Procédé et dispositif pour l'exécution d'une couture surjetée au moyen d'une machine à coudre zigzag
DE2852299C2 (de) Verfahren und Vorrichtung zur Bildung einer Überwendlichnaht mit Hilfe einer Zickzack-Nähmaschine
DE4009203C2 (fr)
DE3419950C2 (de) Stichtyp und Verfahren und Vorrichtung zu seiner Herstellung
DE3309607C1 (de) Vorrichtung zum Zufuehren und Annaehen eines Besatzbandes an Randbereiche von Bekleidungsteilen aus Maschenmaterial
DE2805280C2 (de) Halbautomatisch arbeitende Vorrichtung zum Annähen von Knöpfen
DE4438240A1 (de) Fadenhandhabungsvorrichtung
DE3916265A1 (de) Zwei-nadel-naehmaschine mit zeitweiliger unterbrechung der naehfunktion einer der nadeln
DE832837C (de) Stoffvorschubeinrichtung fuer Naehmaschinen
DE294974C (fr)
DE3522860A1 (de) Vorrichtung zum abschneiden von faeden fuer naehmaschinen
DE699972C (de) Fadensteuervorrichtung fuer Naehmaschinen
DE2713491C2 (de) Nähautomat zur Bildung einer Kettenstich-Naht
DE10001611C2 (de) Verfahren und Vorrichtung zum maschinellen Verriegeln einer Kettenstichnaht
DE868827C (de) Vorschubkessel-Naehmaschine
DE280813C (fr)
DE166735C (fr)
DE647476C (de) Greifer- und Spulengehaeusevorrichtung fuer Naehmaschinen
WO2003008692A1 (fr) Machine a coudre a point de chainette permettant de coudre des points a couture recouverte
DE1660936A1 (de) Naehmaschine
DE307844C (fr)
DE1485424C (de) Fadenabschneideinrichtung für Doppelkettenstichnähmaschinen
DE151368C (fr)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19811109

AK Designated contracting states

Designated state(s): CH DE FR GB IT SE

ITF It: translation for a ep patent filed

Owner name: JACOBACCI & PERANI S.P.A.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Designated state(s): CH DE FR GB IT LI SE

REF Corresponds to:

Ref document number: 3067167

Country of ref document: DE

Date of ref document: 19840426

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19910816

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19910906

Year of fee payment: 12

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19911017

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19920919

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19920919

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19930528

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19930602

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19930916

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19931026

Year of fee payment: 14

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19940920

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19940930

Ref country code: CH

Effective date: 19940930

EAL Se: european patent in force in sweden

Ref document number: 80105642.5

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

EUG Se: european patent has lapsed

Ref document number: 80105642.5