EP0048293B1 - Method and device for producing an overedge seam with the aid of a zigzag sewing machine - Google Patents

Method and device for producing an overedge seam with the aid of a zigzag sewing machine Download PDF

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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
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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
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German (de)
French (fr)
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EP0048293A1 (en
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 DE8080105642T priority Critical patent/DE3067167D1/en
Priority to EP80105642A priority patent/EP0048293B1/en
Priority to JP56132220A priority patent/JPS5772690A/en
Priority to US06/297,415 priority patent/US4391214A/en
Publication of EP0048293A1 publication Critical patent/EP0048293A1/en
Application granted granted Critical
Publication of EP0048293B1 publication Critical patent/EP0048293B1/en
Expired legal-status Critical Current

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    • 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.

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

Description

Das durch DE-AS 28 52 299 bekannte Verfahren zum Bilden einer Überwendlichnaht mit Hilfe einer Zickzack-Nähmaschine sieht vor, daß die Nadelstange nach dem Bilden einer ersten Verschlingung von Nadel- und Greiferfaden in einer ersten Überstichlage zum Bilden einer weiteren Fadenverschlingung in eine zweite Überstichlage wechselt, wobei der Nadelfaden über einen Übernähdorn gelegt und dadurch gelockert wird. In der zweiten Überstichlage der Nadelstange wird dann mindestens ein Geradstich gebildet, worauf der von der ersten zur zweiten Fadenverschlingung führende Nadelfaden beim folgenden Wechsel der Nadelstange in die erste Überstichlage zu einer Schleife ausgezogen, der Nadel zum Einstich dargeboten und danach freigegeben wird. Der Wechsel der Nadelstange in die jeweils andere Überstichlage erfolgt bei ausgesetztem Nähgutvorschub. Zur Erzieleung einer besonders lockeren Naht wird das Fadenstück zwischen der ersten und zweiten Fadenverschlingung unter Umkehr der Nähgutvorschubrichtung ausgezogen. Die fortschreitende Nahtbildung wird ausschließlich durch die Ausführung mindestens eines Geradstiches innerhalb einer aus mindestens vier Stichen gebildeten Grundformation der Überwendlichnaht erzielt.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. To achieve a particularly loose seam, 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.

Durch die Vorschubpausen bzw. die Ausführung eines Rückwärtsstiches entsteht eine nicht unerhebliche Verzögerung der fortschreitenden Nahtbildung, so daß die effektive Vorschubgeschwindigkeit und damit die Nähzeit negativ beeinflußt werden. Rationell läßt sich dieses Verfahren nur auf solchen Zickzack-Nähmaschinen ausführen, die mit Steuerungsmitteln für die Nadelstange und den Stoffschieber ausgerüstet sind.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.

Bei der Vorrichtung zur Durchführung des bekannten Verfahrens ist der zum Lockern und Ausziehen des von der ersten zur zweiten Fadenverschlingung einer Grundformation der Überwendlichnaht führenden Nadelfadens dienende Übernähdorn an seinem freien Ende hakenförmig ausgebildet, um ein Abrutschen des auszuziehenden Nadelfadens zu verhindern. Allerdings reicht die Sicherheit gegen das Abrutschen bei Verwendung von steifen und glatten Fäden nicht aus. Durch stärkere Aufbiegung des Hakens könnte das Abrutschen zwar weitgehend verhindert werden, jedoch ergeben sich dann Schwierigkeiten beim Abstreifen der ausgezogenen Fadenschleife. Zum Abstreifen wird nämlich der Übernähdorn der bekannten Vorrichtung mit Berührungskontakt an der Vorderkante eines auf dem Stoffdrücker der Nähmaschine befestigten Schleifenabstreifbügels vorbeibewegt. Bei Verwendung eines zur Erhöhung der Sicherheit gegen Abrutschen der Fadenschleife stärker aufgebogenen Übernähdornes würde bei der bekannten Vorrichtung die Fadenbeanspruchung beim Abstreifen der Fadenschleife in einem nicht vertretbaren Maße ansteigen.In the device for carrying out the known method, 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. However, 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. For stripping, namely, 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. When using a sewing mandrel which is more openly bent to increase the security against slipping off of the thread loop, the thread stress would increase to an unacceptable degree when stripping the thread loop in the known device.

Der in den Ansprüchen zusammengefaßten Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zu dessen Durchführung zu entwickeln, die es ermöglichen, eine Überwendlichnaht wesentlich schneller herzustellen, eine schonende Fadenbehandlung und volle Sicherheit gegen das Abrutschen der auszuziehenden Fadenschleife vom Übernähdorn gewährleisten und es gestatten, die Überwendlichnaht auf jeder normalen Zickzack-Nähmaschine herzustellen.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.

Die Überwendlichnaht kann nach dem neuen Verfahren mit der gleichen Vorschubgeschwindigkeit wie eine normale Zickzacknaht genäht werden.The overlock seam can be sewn using the new method at the same feed rate as a normal zigzag seam.

Die Fadenschleife wird durch die in den Ansprüchen 2 und 3 angegebenen Einzelheiten beim Nähen sowöhl über den Übernähdorn als auch über den Abstreifer gelegt, sie kann daher sehr leicht und schonend vom Übernähdorn abgehoben und freigegeben werden. Außerdem ergibt sich durch die Maßnahme nach Anspruch 2 und 3 eine besonders einfache, von der Axialbewegung der Nadelstange abgeleitete Steuerung des Abstreifers.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. In addition, 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.

Das Abrutschen der Fadenschleife während der Ausziehbewegung des Übernähdornes wird durch die im Anspruch 4 angegebenen Merkmale wirksam verhindert, weil Halteglied und Übernähdorn praktisch eine beim Ausziehen geschlossene Öse für die Fadenschleife bilden.The slipping of the thread loop during the pull-out movement of the sewing mandrel is effectively prevented by the features specified in claim 4, because the holding member and the sewing mandrel practically form a closed eyelet for the thread loop when pulled out.

Durch die Merkmale nach Anspruch 5 wird die Öse auf sehr einfache Weise für den Eintritt der Fadenschleife geöffnet und zum Ausziehen geschlossen.Due to the features of claim 5, the eyelet is opened in a very simple manner for the entry of the thread loop and closed for pulling out.

Durch die Ausbildung und Anordnung der Vorrichtung nach Anspruch 6 und 7 folgt sie allen Vertikalbewegungen des Stoffdrückers.Due to the design and arrangement of the device according to claims 6 and 7, it follows all vertical movements of the presser.

Aufgrund aller Maßnahmen nach Anspruch 2 bis 7 zusammengenommen eignet sich die Vorrichtung als Zusatzgerät für jede normale Zick- zack-Nähmaschine.Because of all the measures according to claims 2 to 7 taken together, the device is suitable as an additional device for any normal zigzag sewing machine.

Das neue Verfahren und die Vorrichtung zu seiner Durchführung sind nachstehend anhand der beigefügten Zeichnung näher beschrieben.The new method and the device for its implementation are described below with reference to the accompanying drawings.

Es zeigen :

  • Figur 1 ein zur Befestigung am Stoffdrücker einer Zickzack-Nähmaschine bestimmtes Ausführungsbeispiel der Vorrichtung zur Durchführung des Verfahrens,
  • Figur 2 ein zur Befestigung an der Stichplatte einer Zickzack-Nähmaschine bestimmtes Ausführungsbeispiel der Vorrichtung zur Durchführung des Verfahrens,
  • Figur 3 eine schaubildliche Darstellung der den Übernähdorn und den Abstreifer für die Fadenschleife tragenden Schaltwelle in vergrößertem Maßstab,
  • Figur 4 bis 6 die freien Enden von Übernähdorn, Fadenabstreifer, Fadenhalteglied und Sohle des Stoffdrückers in drei verschiedenen Arbeitsphasen und
  • Figur 7 eine vergrößerte schaubildliche Darstellung einer nach dem neuen Verfahren hergestellten Überwendlichnaht an der Randkante eines Stoffstückes.
Show it :
  • FIG. 1 shows an embodiment of the device for carrying out the method intended for attachment to the fabric presser of a zigzag sewing machine,
  • FIG. 2 shows an exemplary embodiment of the device for carrying out the method intended for attachment to the throat plate of a zigzag sewing machine,
  • FIG. 3 shows a diagrammatic representation of the control shaft carrying the oversewing mandrel and the stripper for the thread loop on an enlarged scale,
  • Figure 4 to 6, the free ends of the sewing mandrel, thread wiper, thread holding member and sole of the presser in three different Work phases and
  • FIG. 7 shows an enlarged diagrammatic representation of an overlock seam produced by the new method on the edge of a piece of fabric.

Im Kopf 20 der Zickzack-Nähmaschine, mit deren Hilfe das Verfahren durchgeführt werden soll, sind die unter Federwirkung stehende Stoffdrückerstange 21 und Nadelstange 22 angeordnet. Am unteren Ende der Nadelstange 22 ist ein Nadelhalter 23 angeordnet, in dem mittels einer einen Zylinderkopf 24 aufweisenden Befestigungsschraube 25 die Nadel 26 befestigt ist, welche mit einem unter der Stichplatte 27 angeordneten fadenführenden Greifer 28 zur Bildung von Doppelsteppstichen zusammenarbeitet. Der Nadelstange 22 werden in bekannter Weise senkrechte Auf- und Abbewegungen und wahlweise quer dazu gerichetete Pendelbewegungen zwischen den mit und II, Fig. 1 und 2, bezeichneten Überstichlagen erteilt.In the head 20 of the zigzag sewing machine, with the aid of which the method is to be carried out, the presser bar 21 and needle bar 22, which are under spring action, are arranged. At the lower end of the needle bar 22, 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.

Die mit einem Durchtrittschlitz für die Nadel 26 versehene Stichplatte 27 der Nähmaschine weist zwei Längsschlitze 29 auf, durch die hindurch die gezahnten Stege 30 des in üblicher Weise eine Viereckbewegung ausführenden Stoffschiebers 31 zur Nähgutverschiebung nach oben durchtreten.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.

Mit den Stegen 30 des Stoffschiebers 31 arbeitet die Sohle 32 des Stoffdrückers der Nähmaschine zusammen, die an einem Schaft 33 gelenkig gelagert ist. Der Schaft 33 ist mittels einer Flügelschraube 34 am unteren Ende der Stoffdrückerstange 21 befestigt, die durch eine nicht dargestellte Stoffdrückerfeder nach abwärts beaufschlagt wird. Der Schaft 33 weist einen Durchbruch 35 auf, durch den der eine Lagersteg (36) eines mit zwei winklig abgebogenen Lagerstegen 36 und 37 ausgebildeten Lagerbügels 38 durchgeführt und in denen eine Welle 39 drehbar und längsverschiebbar gelagert ist. Der Lagerbügel 38 ist mittels einer nicht dargestellten Schraube im Schaft 33 befestigt. Durch die Verbindung Schaft 33/Lagersteg 36 folgt die Welle 39 allen vertikalen Bewegungen des Stoffdrückers.With the webs 30 of the fabric slide 31, the sole 32 of the fabric presser of the sewing machine works together, which is articulated on a shaft 33. 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.

Am unteren, durch den Lagersteg 36 ragenden Ende der Welle 39 ist ein Winkelträger 40 mittels einer Schraube 41, Fig. 3, befestigt. Die Axialsicherung der Welle 39 erfolgt durch einen auf ihrem oberen Ende befestigten Tasthebel 42 und einen Sprengring 43, Fig. 1 und 2. Zwischen dem Lagersteg 36 und dem Winkelträger 40 ist auf der Welle 39 eine Drehfeder 44 angeordnet, welche zwei freie Schenkel 45 und 46 aufweist, von denen der eine, 45, am Lagersteg 36 abgestützt ist und der andere, 46, am Winkelträger 40 angreift. Der Lagerbügel 38 ist durch Schrauben 47 an einem die Teile der Vorrichtung umschließenden Gehäuse 48 befestigt, das der besseren Montage wegen mehrteilig ausgebildet sein kann. Der Tasthebel 42 weist ein hochgebogenes, durch eine Aussparung 49 des Gehäuses 48 ragendes freies Ende 50 mit einer schrägen Anlauffläche 51, Fig. 3, auf, die mit der Nadelstange 22 zusammenarbeitet, um die Welle 39 zu verdrehen.At the lower end of the shaft 39, which projects through the bearing web 36, 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. Between the bearing web 36 and the angle bracket 40, 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.

Am Winkelträger 40 ist ein Übernähdorn 52 ausgebildet, der eine nach oben abgebogene Haltenase 53 für die Nadelfadenschleife aufweist und durch eine Öffnung im Gehäuse 48 nach außen bis über den Nadeldurchtrittschlitz ragt. In die Endstellung wird der Winkelträger 40 mit dem Übernähdorn 52 durch die Drehfeder 44 gedrückt. Die Endstellung wird durch eine in einem Lappen 54 des Lagerbügels 38 angeordnete, einstellbare Anschlagschraube 55 bestimmt, die mit einem Ansatz 56, Fig. 3, des Tasthebels 42 zusammenwirkt.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. In the end position, 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.

An einem winklig hochgebogenen Lagersteg 57 des Winkelträgers 40 ist ein als zweiarmiger Hebel ausgebildeter Abstreifer 58 für die Nadelfadenschleife um eine Zapfenschraube 59, Fig. 3, schwenkbar gelagert. Der eine Arm 60 ragt zur Nadel 26 hin. Sein vorderes Ende ist parallel zum Übernähdorn 52 angeordnet und bildet eine Ergänzung von diesem. Der andere Arm 61 des Abstreifers 58 ragt schräg nach aufwärts. Sein Ende ist L-förmig abgebogen und der freie Steg 62 weist eine schräge Anlauffläche 63 auf, die in der Überstichlage I der Nadelstange 22 in die Bewegungsbahn des Zylinderkopfes 24 der Nadelbefestigungsschraube 25 ragt. Am Arm 60 des Abstreifers 58 ist ein winklig abgebogener Lappen 64 zur Befestigung eines aus Federdraht hergestellten Haltegliedes 65 für die Nadelfadenschleife mittels einer Schraube 66 vorgesehen. Der vordere Teil des Haltegliedes 65 ist nach unten abgebogen. Das Halteglied 65 legt sich zum Ausziehen einer Nadelfadenschleife mit dem freien Ende unter der Wirkung einer den Abstreifer 58 beaufschlagenden Schenkelfeder 67 gegen Haltenase 53 des Übernähdornes 52 (Fig. 5). In der Fadenfangstellung (Fig. 4) läuft der Abstreifer 58 mit dem vorderen Ende seines Armes 60 auf eine Anlauffläche 69 der Stoffdrückersohle 32 auf, wodurch der Arm 60 und damit das Halteglied 65 etwas angeboben werden, so daß zwischen Haltenase 53 und Halteglied 65 ein Spalt entsteht, durch den eine über das Halteglied 65, den Übernähdorn 52 und den Arm des Abstreifers 58 gelegte Nadelfadenschleife eintreten kann und so hinter die Haltenase 53 des Übernähdornes 52 gelangt. Wie erwähnt, wird der Spalt zum Ausziehen der Nadelfadenschleife - wie in Fig. 5 dargestellt - durch die Feder 67 geschlossen, so daß Übernähdorn 52 und Haltegleid 65 praktisch eine Öse bilden. In der Freigabestellung für die Fadenschleife (Fig. 6) wird der Abstreifer 58 durch Auflaufen des Zylinderkopfes 24 der Schraube 25 auf die Gleitfläche 63 um die Zapfenschraube 59 gegen die Wirkung der Schenkelfeder 67 verschwenkt, wobei der Arm 60 des Abstreifers 58 bis über die Haltenase 53 des Übernähdornes 52 angehoben und das Halteglied 65 von der Haltenase 53 abgehoben wird. Die ausgezogene Nadelfadenschleife kann so unbehindert über die Haltenase 53 abrutschen.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. On the arm 60 of the stripper 58 there is an angled tab 64 for fastening a holding member 65 made of spring wire for the needle thread loop by means of a screw 66. The front part of the holding member 65 is bent downwards. The holding member 65 lies against the holding nose 53 of the sewing mandrel 52 (FIG. 5) with the free end under the action of a leg spring 67 acting on the stripper 58 in order to pull out a needle thread loop. In the thread catching position (FIG. 4), 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. As mentioned, 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. 6), 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.

Zur Führung der Seitenkante des Nähgutes W ist auf der Stoffdrückersohle 32 ein Lineal 70 mit einem nach unten abgewinkelten Führungssteg 71 befestigt.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.

Beim zweiten Ausführungsbeispiel der Vorrichtung ist die Welle 39 zur Stabilisierung in einem Lagerwinkel 72 gelagert, der mit seinem Fußteil mit Hilfe einer durch einen Klemmring 73 gegen Verlorengehen gesicherten Rändelschraube 74 auf der Stichplatte 27 der Nähmaschine befestigt ist. Zur Lagesicherung weist der Fußteil des Lagerwinkels 72 an der Unterseite eine Rippe 75 auf, die in eine Aussparung 76 in der Stichplatte 27 eingreift.In the second embodiment of the device, 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. To secure the position, 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.

Durchführung der Verfahrens und Arbeitsweise der Vorrichtung.Implementation of the method and operation of the device.

Es wird davon ausgegangen, daß das Nähgut W mit der zu benähenden Kante an den Führungssteg 71 des Lineals 70 anstoßend auf der Stichplatte 27 aufliegt, an die es durch die übliche Stoffdrückerstangenfeder über die am Schaft 33 angeordnete Stoffdrückersohle 32 angedrückt wird, die zur Ausführung von Zick-Zack-Stichen eingestellte Nähmaschine in Nadelhochstellung stillgesetzt ist und noch keine Fadenverschlingung erfolgt ist.It is assumed that the sewing material W rests with the edge to be sewn abutting the guide web 71 of the ruler 70 on the needle plate 27, to which it is pressed by the usual presser bar spring via the presser sole 32 arranged on the shaft 33, which is used to execute Zigzag stitches set sewing machine is stopped in the needle up position and thread has not yet been twisted.

Wird davon ausgehend die Nähmaschine eingeschaltet, dann sticht die Nadel 26 zum Bilden der ersten Verschlingung von Nadel- und Greiferfaden NF bzw. GF zuerst im Punkt 1, Fig. 7, in der Überstichlage I, Fig. 1, 2, der Nadelstange 22 ein, wobei die Enden der Fäden bei Nähbeginn von der Näherin in festgehalten werden. Zum Bilden der Überwendlichnaht wechselt die Nadelstange 22 in die Überstichlage II unter Verschiebung des Nähgutes W um eine Stichlänge durch den Stoffschieber 31 zum Einstich der Nadel 26 im Punkt 2. Dabei nehmen der Übernähdorn 52, der Arm 60 des Abstreifers 58 und das Halteglied 65 ihre in Fig. 5 gezeigte Stellung ein, während die den Tasthebel 42 und den Winkelträger 40 mit den Vorrichtungsteilen tragende Welle 39 der Pendelbewegung der Nadelstange 22 unter der Wirkung der Schenkelfeder 44 folgt und der zum Punkt 1 reichende Nadelfaden NF über das Halteglied 65, den Übernähdorn 52 und den Arm 60 des Abstreifers 58 gelegt wird, so daß er eine größere Länge als die Strekce 1-2 hat. Kurz bevor die Nadelstange 22 die Überstichlage 11 erreicht hat, läuft der Arm 60 des Abstreifers 58 mit dem freien Ende auf die Anlauffläche 69 der Stoffdrückersohle 32 auf, wodurch der Arm 60 des Abstreifers 58 und damit auch das Halteglied 65 etwas angehoben werden, so daß zwischen dem freien Ende des Haltegleides 65 und der Haltenase 53 ein Spalt entsteht, wie in Fig. 4 gezeigt, durch den der Nadelfaden NF bei der Abwärtsbewegung der Nadelstange 22 durchtritt und hinter die Haltenase 53 gelangt. Nach erfolgter Verschlingung von Nadel- und Greiferfaden durch den Greifer 28 wechselt die Nadelstange 22 wieder in die Überstichlage 1, wobei das Nähgut W um eine weitere Stichlänge in Richtung des Pfeiles V zum Einstich der Nadel 26 bei 3, Fig. 7, vorgeschoben wird, während sich die Nadel 26 außerhalb des Nähgutes W befindet.If the sewing machine is switched on as a starting point, then 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. To form the overlock seam, 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. Shortly before the needle bar 22 has reached the overstitch position 11, 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. After the needle and looper thread have been entangled by the looper 28, 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.

Bei der Pendelbewegung der Nadelstange 22 wird die Welle 39 mit dem an ihr angeordneten Übernähdorn 52, dem Abstreifer 58 und dem Halteglied 65 über den mit der Nadelstange 22 zusammenwirkenden Tasthebel 42 entgegen der Wirkung der Drehfeder 44 verdreht. Dabei läuft zunächst der Arm 60 des Abstreifers 58 von der Anlauffläche 69 der Stoffdrückersohle 32 ab und der Abstreifer 58 wird durch die Schenkelfeder 67 - bezogen auf Fig. 3 - entgegen dem Uhrzeigersinn um die Zapfenschraube 59 verschwenkt, so daß der Spalt zwischen der Haltenase 53 und dem Halteglied 65 geschlossen wird. Bei der weiteren Drehbewegung der Welle 39 wird der von der ersten zur zweiten Verschlingung reichende Nadelfaden NF zu einer Schleife ausgezogen und in der Überstichlage der Nadel 26 zum Einstich dargeboten. Sobald die Nadel 26 bei 3, Fig. 7, in diese Fadenschleife eingetreten ist, trifft der Zylinderkopf 24 der Nadelbefestigungsschraube 25 auf die Anlauffläche 63 des Steges 61 des Abstreifers 58 und verschwenkt diesen zusammen mit dem Halteglied 65 - bezogen auf Fig. 3 - im Uhrzeigersinn um die Zapfenschraube 59 mit der an der Fadenschleife angreifenden Oberkante des Armes 60 bis über die Haltenase 53 (vergleiche Fig. 6). Die Fadenschleife kann bei der sogenannten Sticheinzugsbewegung des üblichen Fadenhebels der Nähmaschine unbehindert über die Haltenase 53 abrutschen. Sie ist an der Stoffaußenkante bei Punkt 3 durch den Greiferfaden GF abgebunden. Mit Vollendung dieser Verschlingung von Nadel- und Greiferfaden ist eine Grundformation der Überwendlichnaht gebildet. Die Ziffern 4 bis 6 in Fig. 7 bezeichnen die weitere Stichfolge bei der fortschreitenden Bildung der Überwendlichnaht, wobei das Nähgut W zwischen jeweils zwei Stichbildungen um eine Stichlänge in Vorschubrichtung, Pfeil V, Fig. 7, verschoben wird. Die Überwendlichnaht wird also mit der gleichen Vorschubgeschwindigkeit wie eine normale Zickzacknaht genäht.During the oscillating movement of the needle bar 22, 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. First, 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. With the further rotation of the shaft 39, 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. As soon as the needle 26 has entered this thread loop at 3, FIG. 7, 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. It is tied on the outer edge of the fabric at point 3 by the looper thread GF. With the completion of this interlacing of needle and looper thread, a basic formation of the overlock seam is formed. Numbers 4 to 6 in FIG. 7 denote the further sequence of stitches as the overcast seam is formed, the material W being shifted by two stitches in the feed direction, arrow V, FIG. 7, between two stitch formations. The overlock seam is sewn at the same feed rate as a normal zigzag seam.

Da zur Steuerung der Vorrichtung die Pendelbewegungen der Nadelstange ausreichen, kann jede normale Zickzacknähmaschine zur Durchführung des Verfahrens unter Benutzung der neuen Vorrichtung verwendet werden.Since the pendulum movements of the needle bar are sufficient to control the device, any normal zigzag sewing machine can be used to carry out the method using the new device.

Claims (7)

1. A method of producing an overedge seam with the aid of a zigzag sewing machine (20), in which after the formation of a first interlacing of the needle and hook threads (NF and GF respectively) in a first overstitch position (I) of the needle bar (22) and after changing the needle bar (22) into a second overstitch position (II) while loosening the needle thread (NF) a further thread interlacing is performed, after which the needle thread (NF) leading from the first to the second thread interlacing is drawn into the first overstitch position (I) while forming a loop, the loop of the needle (26) is presented to the next penetration and is then released, characterized in that the change of the needle bar (22) into the other overstitch position in each case is carried out while displacing the sewn material (W) in the feed direction (arrow V) by the length of a stitch in each case.
2. An apparatus for performing the method according to Claim 1 with an oversewing mandrel (52) performing two successive movement phases and a stripper (58) for the thread loop, characterized in that in one overstitch position (II) the stripper (58) is disposed parallel and directly adjacent to the oversewing mandrel (52) and forms an extension of the oversewing mandrel (52) and in the other overstitch position (I) it may be moved into a thread-stripping position by the needle bar (22).
3. An apparatus according to Claim 2, characterized in that the stripper (58) is pivotably mounted on the oversewing mandrel (52) and is in the form of a two-armed lever (60, 61), one arm (60) of which forms the extension of the oversewing mandrel (52) and the other arm (61) of which in one overstitch position (1) projects into the path of movement of the needle bar (22).
4. An apparatus according to Claims 2 and 3, characterized in that the first arm (60) of the stripper (58) supports a holding member (65) for the thread loop, which [holding member] may be moved by its free end to bear against the oversewing mandrel (52).
5. An apparatus according to Claims 2 to 4, characterized in that the free end of the holding member (65) in the second overstitch position (II) of the needle bar (22) may be raised by running the stripper (58) up on a sliding surface (69) of the pressure bar (32) from the oversewing mandrel (52).
6. An apparatus according to Claims 2 to 5, characterized in that it is disposed in its own casing (48) connected to the pressure bar (32) of the sewing machine (20).
7. An apparatus according to Claims 2 to 6 having a shaft (39) supporting the oversewing mandrel (52), characterized in that the shaft (39) is disposed in a bearing bracket (38) disposed on the needle plate (27) of the sewing machine (20) and projecting into the casing (48), and together with the casing (48) is connected to the pressure bar (32/33) by way of an entraining member.
EP80105642A 1980-09-19 1980-09-19 Method and device for producing an overedge seam with the aid of a zigzag sewing machine Expired EP0048293B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
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
EP80105642A EP0048293B1 (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 (en) 1980-09-19 1980-09-19 Method and device for producing an overedge seam with the aid of a zigzag sewing machine

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EP0048293A1 EP0048293A1 (en) 1982-03-31
EP0048293B1 true EP0048293B1 (en) 1984-03-21

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EP80105642A Expired EP0048293B1 (en) 1980-09-19 1980-09-19 Method and device for producing an overedge seam with the aid of a zigzag sewing machine

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US (1) US4391214A (en)
EP (1) EP0048293B1 (en)
JP (1) JPS5772690A (en)
DE (1) DE3067167D1 (en)

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Publication number Priority date Publication date Assignee Title
JPH0230596U (en) * 1988-08-18 1990-02-27
CH712437A1 (en) 2016-05-06 2017-11-15 Bernina Int Ag Sewing machine comprising a device for manually changing a transporter.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2811455A1 (en) * 1977-03-14 1978-09-21 Mefina Sa METHOD FOR MAKING A SEAM CLOSE TO THE EDGE OF A FABRIC TO PREVENT ITS FIBRATION
EP0011689A1 (en) * 1978-12-02 1980-06-11 Dorina Nähmaschinen GmbH Method and device for overedge seaming with the aid of a zig-zag sewing machine

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 (en) * 1977-03-14 1978-09-21 Mefina Sa METHOD FOR MAKING A SEAM CLOSE TO THE EDGE OF A FABRIC TO PREVENT ITS FIBRATION
EP0011689A1 (en) * 1978-12-02 1980-06-11 Dorina Nähmaschinen GmbH Method and device for overedge seaming with the aid of a zig-zag sewing machine

Also Published As

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

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