EP0106795B1 - Sewing machine accessory - Google Patents

Sewing machine accessory Download PDF

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Publication number
EP0106795B1
EP0106795B1 EP83810343A EP83810343A EP0106795B1 EP 0106795 B1 EP0106795 B1 EP 0106795B1 EP 83810343 A EP83810343 A EP 83810343A EP 83810343 A EP83810343 A EP 83810343A EP 0106795 B1 EP0106795 B1 EP 0106795B1
Authority
EP
European Patent Office
Prior art keywords
blade
sewing machine
support
cutting
knife
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
EP83810343A
Other languages
German (de)
French (fr)
Other versions
EP0106795A1 (en
Inventor
Ernst Dreier
Jakob Rickenbach
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.)
Fritz Gegauf AG
Original Assignee
Fritz Gegauf AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fritz Gegauf AG filed Critical Fritz Gegauf AG
Priority to AT83810343T priority Critical patent/ATE20095T1/en
Publication of EP0106795A1 publication Critical patent/EP0106795A1/en
Application granted granted Critical
Publication of EP0106795B1 publication Critical patent/EP0106795B1/en
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B37/00—Devices incorporated in sewing machines for slitting, grooving, or cutting
    • D05B37/04—Cutting devices
    • D05B37/06—Cutting devices with oscillating tools
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B37/00—Devices incorporated in sewing machines for slitting, grooving, or cutting
    • D05B37/04—Cutting devices
    • D05B37/06—Cutting devices with oscillating tools
    • D05B37/063—Cutting devices with oscillating tools in synchronism with the movement of the needle bar or the work-feeding means

Definitions

  • the invention relates to an additional device for a sewing machine for trimming material edges with a fixed and a movable knife that can be driven by the needle bar of the machine and works in a scissor-like manner with the fixed knife.
  • Such additional devices which can be attached to sewing machines of all types, for trimming the material edge running against the sewing point are known in various designs.
  • the knife which is driven by the needle bar and moves essentially vertically, interacts with a counter knife fixedly connected to a part of the machine.
  • the movable knife is either attached directly to the needle bar or to a knife holder attached to the working surface of the machine (I-PS 603 617).
  • a suitably designed edge of the throat plate, a cutting edge attached to this or a counter knife carried by the additional device serves as the fixed counter knife.
  • the known additional devices are either cumbersome to handle by replacing parts of the sewing machine, or adjustment work is required to ensure the exact interaction of the two knives.
  • the presser foot must be replaced with the cutting device.
  • the direct attachment of the additional device to the presser bar has the disadvantage that the device is raised together with the presser when sewing and cutting thick material, so that the supply of sewing material and the simultaneous sewing of the material edge are at least made very difficult, if not impossible.
  • the axis of the movable knife lies directly at the cutting point and hinders the removal of the separated material.
  • Another disadvantage of the additional device mentioned is the transmission of motion over several joints, which in addition to complex production also leads to undesired wear, play and noise.
  • the immediate vicinity of the two knives should not have any elements that inhibit the flow of material and the passage space for the separated material must be large enough and free of obstacles that could lead to material jam.
  • the force transmission between the drive element arranged on the needle bar and the movable knife should take place as directly as possible and not via intermediate elements.
  • the present invention aims to provide an additional device for cutting material edges on a sewing machine, which does not have the disadvantages of the known devices of this type.
  • the axial displacement of the knife carrier and its drive parts with respect to the cutting plane of the knives is particularly advantageous, thereby creating a free passage space for the separated material.
  • the U-shaped design of the movable knife with the knife arm bridging the passage space and the knife protruding downwards, which interacts with the flat counter knife, has the great advantage that the area surrounding the knife remains free both laterally and in height, and the material flow can be done freely.
  • the free passage space should preferably be about 20 mm on the side and at least 8 mm high so that all materials that can usually be processed on a household sewing machine can be cut without any problems.
  • the movable knife is driven from the drive member of the needle bar, which is usually part of the needle holder, via a single intermediate member containing the control curve for the knife directly onto the knife carrier.
  • the knife carrier is axially movable to a small extent and is pressed together with the knife under spring pressure against the fixed counter knife. As a result, the two cutting edges are always close to one another, which leads to a self-grinding effect of the knives during operation.
  • an articulated lever mechanism 4 consisting of a drive fork 5, a drive cam carrier 6 and a knife carrier 7, is provided on a device carrier 1 with a base plate 2 and an attachment 3, an articulated lever mechanism 4, consisting of a drive fork 5, a drive cam carrier 6 and a knife carrier 7, is provided on a device carrier 1 with a base plate 2 and an attachment 3, an articulated lever mechanism 4, consisting of a drive fork 5, a drive cam carrier 6 and a knife carrier 7, is provided on a device carrier 1 with a base plate 2 and an attachment 3, an articulated lever mechanism 4, consisting of a drive fork 5, a drive cam carrier 6 and a knife carrier 7, is provided on a device carrier 1 with a base plate 2 and an attachment 3, an articulated lever mechanism 4, consisting of a drive fork 5, a drive cam carrier 6 and a knife carrier 7, is provided on a device carrier 1 with a base plate 2 and an attachment 3, an articulated lever mechanism 4, consisting of a drive fork 5, a drive cam carrier 6 and a knife carrier 7, is provided
  • a U-shaped knife 17 with a cutting blade 16 projecting downward is provided on the knife carrier 7.
  • the knife 17 is preferably fastened to the knife carrier 7 with screws 18, 19.
  • One of the screws 18 or 19 can be designed as an eccentric in order to make the knife 17 adjustable relative to the knife carrier 7.
  • a spring 12 is provided, by means of which the cutting blade 16 rests resiliently against the cutting edge 20 of a fixed knife 21 provided on the base plate 2.
  • the knife 21 is designed as a flat part that protrudes laterally from the base plate 2 and is only a few millimeters high.
  • a knurled screw 22 which, together with a centering pin 23, serves to fix the base plate 2 of the device carrier 1 on the work surface 24 of a sewing machine.
  • a bolt 25 which is usually part of the needle holder and is arranged on the needle bar 27 of the machine, engages in the opening 10 of the fork 5.
  • the knife 17 is also raised via the pin 14 engaging in the curved path 15, i. H. the two knives 17 and 21 lie opposite each other at an (opening) angle a, the edges of the knives 17 and 21 crossing at point A on the side facing the needle 28 (FIGS. 1 and 3).
  • FIG. 1 a material web 30 to be processed is inserted into the opening cutout of the two knives 17, 21 and the sewing machine is started.
  • the needle 28 is lowered, the fork 5 and with it the cam carrier 6 are rotated about the axis 9.
  • the guide pin 14 rotates the knife holder 7 about the axis 11.
  • the cutting edge 20 of the knife 17 attached to the holder 7 slides past the edge 20 of the knife 21 and separates the one lying in the opening area of the knives 17 and 21 Material while the sewing tools stitch the edge seam (Fig. 2).
  • the needle 28 With the reversal of the movement of the needle bar 27, the needle 28 is pulled out of the material web 30 and the knife 17 is raised. As soon as the needle 28 is in its upper region, the fabric pusher, not shown, of the machine pushes the material web 30 under the fabric pusher 29 by a stitch length in the direction of arrow B. A new, yet untrimmed section of the material web 30 is thereby pushed into the working area of the two knives 17 and 21, which are now opened again via the articulated lever mechanism 4.
  • cam track 15 allows both the lateral sequence and the course of the cutting speed to be determined.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Massaging Devices (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

An attachment for cutting the edge of a length of material travelling towards a sewing location is mounted on the working or operating surface of a sewing machine. A drive fork is acted upon by a needle bar and drives a movable cutter blade via a drive or control cam carrier. The movable cutter blade is arranged at a blade holder which is pivotable about a pivot axis which is laterally spaced from a cutting plane defined by the movable cutter blade and a fixed cutter blade. A large throughpassage or space for strips separated from the length of material by the cutter blades is formed between the cutting plane and the blade holder.

Description

Gegenstand der Erfindung ist eine Zusatzvorrichtung für eine Nähmaschine zum Beschneiden von Materialkanten mit einem feststehenden und einem durch die Nadelstange der Maschine antreibbaren, scherenartig mit dem feststehenden Messer zusammenarbeitenden, beweglichen Messer gemäss Oberbegriff des Patentanspruches 1.The invention relates to an additional device for a sewing machine for trimming material edges with a fixed and a movable knife that can be driven by the needle bar of the machine and works in a scissor-like manner with the fixed knife.

Solche an Nähmaschinen aller Art anbaubare Zusatzvorrichtungen zum Beschneiden der gegen die Nähstelle laufenden Nähgutkante sind in verschiedenen Ausführungen bekannt. Gewöhnlich wirkt das von der Nadelstange angetriebene, im wesentlichen senkrecht bewegte Messer mit einem fest mit einem Teil der Maschine verbundenen Gegenmesser zusammen. Dabei ist das bewegliche Messer entweder direkt an der Nadelstange befestigt oder an einem auf der Arbeitsfläche der Maschine befestigten Messerträger (I-PS 603 617). Als festes Gegenmesser dient entweder eine entsprechend ausgebildete Kante der Stichplatte, eine an dieser befestigte Schneidkante oder ein von der Zusatzvorrichtung getragenes Gegenmesser (DE-OS 31 22 935).Such additional devices, which can be attached to sewing machines of all types, for trimming the material edge running against the sewing point are known in various designs. Usually, the knife, which is driven by the needle bar and moves essentially vertically, interacts with a counter knife fixedly connected to a part of the machine. The movable knife is either attached directly to the needle bar or to a knife holder attached to the working surface of the machine (I-PS 603 617). Either a suitably designed edge of the throat plate, a cutting edge attached to this or a counter knife carried by the additional device (DE-OS 31 22 935) serves as the fixed counter knife.

Die bekannten Zusatzvorrichtungen sind entweder umständlich zu handhaben, indem Teile der Nähmaschine auszutauschen sind, oder es sind Justierarbeiten erforderlich, um das exakte Zusammenwirken der beiden Messer sicherzustellen. Im Falle der bereits erwähnten DE-OS 31 22 935 muss der Nähfuss gegen die Schneidvorrichtung ausgetauscht werden. Die direkte Befestigung der Zusatzvorrichtung an der Stoffdrückerstange hat den Nachteil, dass die Vorrichtung beim Nähen und Schneiden von dickem Nähgut zusammen mit dem Stoffdrücker angehoben wird, so dass die Nähgutzuführung und das gleichzeitige Umnähen der Materialkante zumindest stark erschwert,wenn nicht gar verunmöglicht werden. Ausserdem liegt die Achse des beweglichen Messers unmittelbar bei der Schneidstelle und behindert die Wegfuhr des abgetrennten Materials. Ein weiterer Nachteil der genannten Zusatzvorrichtung besteht in der Bewegungsübertragung über mehrere Gelenke, was ausser zu einer aufwendigen Herstellung auch zu unerwünschter Abnutzung, Spiel und Lärm führt.The known additional devices are either cumbersome to handle by replacing parts of the sewing machine, or adjustment work is required to ensure the exact interaction of the two knives. In the case of the aforementioned DE-OS 31 22 935, the presser foot must be replaced with the cutting device. The direct attachment of the additional device to the presser bar has the disadvantage that the device is raised together with the presser when sewing and cutting thick material, so that the supply of sewing material and the simultaneous sewing of the material edge are at least made very difficult, if not impossible. In addition, the axis of the movable knife lies directly at the cutting point and hinders the removal of the separated material. Another disadvantage of the additional device mentioned is the transmission of motion over several joints, which in addition to complex production also leads to undesired wear, play and noise.

Bei der Verarbeitung mittlerer bis dicker Materialien sollte die unmittelbare Umgebung der beiden Messer keine den Materialfluss hemmenden Elemente aufweisen und der Durchgangsraum für das abgetrennte Material muss gross genug und frei von Hindernissen sein, welche zu einem Materialstau führen könnten. Entsprechend dem aufzubringenden Schneiddruck sollte die Kraftübertragung zwischen dem an der Nadelstange angeordneten Antriebsglied und dem beweglichen Messer möglichst direkt und nicht über Zwischenglieder erfolgen.When processing medium to thick materials, the immediate vicinity of the two knives should not have any elements that inhibit the flow of material and the passage space for the separated material must be large enough and free of obstacles that could lead to material jam. In accordance with the cutting pressure to be applied, the force transmission between the drive element arranged on the needle bar and the movable knife should take place as directly as possible and not via intermediate elements.

Die vorliegende Erfindung bezweckt die Schaffung einer Zusatzvorrichtung zum Schneiden von Materialkanten auf einer Nähmaschine, welche die Nachteile der bekannten Vorrichtungen dieser Art nicht aufweist.The present invention aims to provide an additional device for cutting material edges on a sewing machine, which does not have the disadvantages of the known devices of this type.

Die erfindungsgemässe Aufgabe wird durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst. Die Unteransprüche definieren weitere vorteilhafte Merkmale der Erfindung.The object of the invention is achieved by the characterizing features of claim 1. The sub-claims define further advantageous features of the invention.

Besonders vorteilhaft ist dabei die axiale Versetzung des Messerträgers und seiner Antriebsteile gegenüber der Schneidebene der Messer, wodurch ein freier Durchgangsraum für das abgetrennte Material geschaffen wird. Die U-förmige Gestalung des beweglichen Messers mit dem den Durchgangsraum überbrückenden Messerarm und dem nach unten ragenden Messer, welches mit dem flachen Gegenmesser zusammenwirkt, hat den grossen Vorteil, dass die Umgebung der Messer sowohl seitlich als auch in der Höhe frei bleibt und der Materialfluss ungehindert erfolgen kann. Der freie Durchgangsraum sollte seitlich vorzugsweise ca. 20 mm und in der Höhe mindestens 8 mm betragen, damit alle üblicherweise auf einer Haushaltnähmaschine verarbeitbaren Materialien störungsfrei geschnitten werden können.The axial displacement of the knife carrier and its drive parts with respect to the cutting plane of the knives is particularly advantageous, thereby creating a free passage space for the separated material. The U-shaped design of the movable knife with the knife arm bridging the passage space and the knife protruding downwards, which interacts with the flat counter knife, has the great advantage that the area surrounding the knife remains free both laterally and in height, and the material flow can be done freely. The free passage space should preferably be about 20 mm on the side and at least 8 mm high so that all materials that can usually be processed on a household sewing machine can be cut without any problems.

Der Antrieb des beweglichen Messers erfolgt vom Antriebsglied der Nadelstange aus, welches üblicherweise Teil des Nadelhalters ist, über ein einziges, die Steuerkurve für das Messer enthaltendes Zwischenglied direkt auf den Messerträger.The movable knife is driven from the drive member of the needle bar, which is usually part of the needle holder, via a single intermediate member containing the control curve for the knife directly onto the knife carrier.

Dadurch ergibt sich eine äusserst kostengünstige Anordnung und die beweglichen kraftübertragenden Teile sind auf ein absolutes Minimum reduziert. Zudem ist der Messerträger in geringem Mass axial beweglich ausgebildet und wird zusammen mit dem Messer unter Federdruck gegen das feste Gegenmesser gedrückt. Dadurch liegen die beiden Schneidkanten immer dicht gegeneinander, was zu einer selbstschleifenden Wirkung der Messer im Betrieb führt.This results in an extremely inexpensive arrangement and the movable force-transmitting parts are reduced to an absolute minimum. In addition, the knife carrier is axially movable to a small extent and is pressed together with the knife under spring pressure against the fixed counter knife. As a result, the two cutting edges are always close to one another, which leads to a self-grinding effect of the knives during operation.

Anhand eines illustrierten Ausführungsbeispieles wird die Erfindung näher erläutert. Es zeigen :

  • Figur 1 eine Seitenansicht (nadelseitig) der Vorrichtung mit angehobener Nadel,
  • Figur 2 eine Seitenansicht der Nadel abgewendeten Seite der Vorrichtung mit abgesenkter Nadel,
  • Figur eine Ansicht der Vorrichtung von vorne, und
  • Figur4 eine Draufsicht auf die Vorrichtung.
The invention is explained in more detail using an illustrated exemplary embodiment. Show it :
  • FIG. 1 shows a side view (on the needle side) of the device with the needle raised,
  • FIG. 2 shows a side view of the side of the device facing away from the needle with the needle lowered,
  • Figure is a view of the device from the front, and
  • Figure4 is a plan view of the device.

Auf einem Vorrichtungsträger 1 mit einer Grundplatte 2 und einem Aufsatz 3 ist ein Gelenkhebelwerk 4, bestehend aus einer Antriebsgabel 5, einem Antriebskurventräger 6 und einem Messerträger 7, vorgesehen. Die Antriebsgabel 5 und der Antriebskurventräger 6 bilden vorzugsweise ein aus einem Stück bestehendes Antriebsteil 8, welches mit einer am Aufsatz 3 in herkömmlicher Weise befestigten Drehachse 9 schwenkbar verbunden ist. Die Gabel 5 mit der schlitzförmigen Oeffnung 10 liegt in einem axialen Abstand zum Antriebskurventräger 6. An der Grundplatte 2 ist der Messerträger 7 über einen Achsbolzen 11 schwenkbar und in geringem Umfang axial verschiebbar angelenkt. Die Bohrung für den Achsbolzen 11 ist in der Grundplatte 2 vorgesehen. Aus dem freien Ende 13 des Messerträgers 7 ragt ein Führungsstift 14 in eine Kurvenbahn 15 im Antriebskurventräger 6. Auf dem Messerträger 7 ist ein U-förmiges Messer 17 mit nach unten ragender Schneidklinge 16 vorgesehen. Vorzugsweise ist das Messer 17 mit Schrauben 18, 19 am Messerträger 7 befestigt. Eine der Schrauben 18 oder 19 kann als Exzenter ausgebildet sein, um das Messer 17 gegenüber dem Messerträger 7 einstellbar zu machen. Zwischen der Grundplatte 2 und dem Messerträger 7 ist eine Feder 12 vorgesehen, durch welche die Schneidklinge 16 elastisch nachgebend gegen die Schneidkante 20 eines an der Grundplatte 2 vorgesehenen feststehenden Messers 21 anliegt.On a device carrier 1 with a base plate 2 and an attachment 3, an articulated lever mechanism 4, consisting of a drive fork 5, a drive cam carrier 6 and a knife carrier 7, is provided. The drive fork 5 and the drive cam carrier 6 preferably form a one-piece drive part 8 which is pivotally connected to an axis of rotation 9 fastened to the attachment 3 in a conventional manner. The fork 5 with the slot-shaped opening 10 lies at an axial distance from the drive cam carrier 6 the base plate 2, the knife carrier 7 is pivoted via an axle pin 11 and axially displaceable to a small extent. The bore for the axle pin 11 is provided in the base plate 2. A guide pin 14 protrudes from the free end 13 of the knife carrier 7 into a curved path 15 in the drive cam carrier 6. A U-shaped knife 17 with a cutting blade 16 projecting downward is provided on the knife carrier 7. The knife 17 is preferably fastened to the knife carrier 7 with screws 18, 19. One of the screws 18 or 19 can be designed as an eccentric in order to make the knife 17 adjustable relative to the knife carrier 7. Between the base plate 2 and the knife carrier 7, a spring 12 is provided, by means of which the cutting blade 16 rests resiliently against the cutting edge 20 of a fixed knife 21 provided on the base plate 2.

Das Messer 21 ist als flaches, von der Grundplatte 2 seitlich auskragendes, nur wenige Millimeter hohes Teil ausgebildet.The knife 21 is designed as a flat part that protrudes laterally from the base plate 2 and is only a few millimeters high.

In der Grundplatte 2 ist eine Rändelschraube 22 vorgesehen, welche zusammen mit einem Zentrierstift 23 zum Fixieren der Grundplatte 2 des Vorrichtungsträgers 1 auf der Arbeitsfläche 24 einer Nähmaschine dient.Provided in the base plate 2 is a knurled screw 22 which, together with a centering pin 23, serves to fix the base plate 2 of the device carrier 1 on the work surface 24 of a sewing machine.

In der Oeffnung 10 der Gabel 5 greift, wenn der Vorrichtungsträger 1 an der Arbeitsfläche 24 einer Nähmaschine befestigt ist, ein an der Nadelstange 27 der Maschine angeordneter Bolzen 25, welcher meistens Teil des Nadelhalters ist, ein.When the device carrier 1 is fastened to the working surface 24 of a sewing machine, a bolt 25, which is usually part of the needle holder and is arranged on the needle bar 27 of the machine, engages in the opening 10 of the fork 5.

Bewegt sich die Nadel 28 mit der Nadelstange 27 in ihre obere Lage, wird das Messer 17 ebenfalls über den in die Kurvenbahn 15 eingreifenden Stift 14 angehoben, d. h. die beiden Messer 17 und 21 liegen in einem (Oeffnungs-) Winkel a einander gegenüber, wobei sich die Kanten der Messer 17 und 21 auf der die Nadel 28 zugewendeten Seite im Punkt A kreuzen (Figuren 1 und 3).If the needle 28 moves with the needle bar 27 into its upper position, the knife 17 is also raised via the pin 14 engaging in the curved path 15, i. H. the two knives 17 and 21 lie opposite each other at an (opening) angle a, the edges of the knives 17 and 21 crossing at point A on the side facing the needle 28 (FIGS. 1 and 3).

Bei abgesenkter Nadel 28 kommt das bewegliche Messer 17, von der Kurvenbahn 15 angetrieben, in seiner ganzen Länge in Anlage mit dem feststehenden Messer 21 und liegt im wesentlichen parallel zu diesem (Fig. 2).When the needle 28 is lowered, the movable knife 17, driven by the cam track 15, comes into contact with the fixed knife 21 over its entire length and lies essentially parallel to the latter (FIG. 2).

Die beschriebene Vorrichtung arbeitet wie folgt :

  • Der Vorrichtungsträger 1 wird mit Hilfe der Schraube 22 und des Zentrierstiftes 23 in den genormten Gewindebohrungen der Arbeitsfläche 24 der Nähmaschine befestigt, wobei der Bolzen 25 an der Nadelstange 27 in Eingriff mit der Gabel 5 gelangt. Ist die Nadel 28 angehoben, so liegen die beiden Messer 17 und 21 in maximalen Oeffnungswinkel a zueinander. An der Nähmaschine sind keine weiteren Aenderungen vorzunehmen.
The described device works as follows:
  • The device carrier 1 is fastened by means of the screw 22 and the centering pin 23 in the standardized threaded bores of the working surface 24 of the sewing machine, the bolt 25 coming into engagement with the fork 5 on the needle bar 27. If the needle 28 is raised, the two knives 17 and 21 are at a maximum opening angle a to one another. No further changes need to be made to the sewing machine.

In Figur 1 wird eine zu bearbeitende Materialbahn 30 in den Oeffnungsausschnitt der beiden Messer 17, 21 eingeführt und die Nähmaschine in Gang gesetzt. Beim Absenken der Nadel 28 wird die Gabel 5 und mit dieser der Kurventräger 6 um die Achse 9 gedreht. Von der bogenförmigen Kurvenbahn 15 geführt, dreht der Führungsstift 14 dem Messerträger 7 um die Achse 11. Die Schneidkante 20 des am Träger 7 befestigten Messers 17 gleitet dabei an der Kante 20 des Messers 21 vorbei und trennt das im Oeffnungsbereich der Messer 17 und 21 liegende Material, während die Nähwerkzeuge einen Stich der Kantennaht bilden (Fig. 2).In FIG. 1, a material web 30 to be processed is inserted into the opening cutout of the two knives 17, 21 and the sewing machine is started. When the needle 28 is lowered, the fork 5 and with it the cam carrier 6 are rotated about the axis 9. Guided by the curved cam track 15, the guide pin 14 rotates the knife holder 7 about the axis 11. The cutting edge 20 of the knife 17 attached to the holder 7 slides past the edge 20 of the knife 21 and separates the one lying in the opening area of the knives 17 and 21 Material while the sewing tools stitch the edge seam (Fig. 2).

Mit der Bewegungsumkehr der Nadelstange 27 wird die Nadel 28 aus der Materialbahn 30 herausgezogen und das Messer 17 wird angehoben. Sobald sich die Nadel 28 in ihrem oberen Bereich befindet, schiebt der nicht gezeigte Stoffschieber der Maschine die Materialbahn 30 unter dem Stoffdrücker 29 um eine Stichlänge in Richtung des Pfeiles B weiter. Ein neuer, noch unbeschnittener Abschnitt der Materialbahn 30 wird dadurch in den Arbeitsbereich der beiden, nun über das Gelenkhebelwerk 4 wieder geöffneten Messer 17 und 21 geschoben.With the reversal of the movement of the needle bar 27, the needle 28 is pulled out of the material web 30 and the knife 17 is raised. As soon as the needle 28 is in its upper region, the fabric pusher, not shown, of the machine pushes the material web 30 under the fabric pusher 29 by a stitch length in the direction of arrow B. A new, yet untrimmed section of the material web 30 is thereby pushed into the working area of the two knives 17 and 21, which are now opened again via the articulated lever mechanism 4.

Durch die Ausgestaltung der Kurvenbahn 15 kann sowohl der seitliche Ablauf als auch der Verlauf der Schnittgeschwindigkeit bestimmt werden.The design of the cam track 15 allows both the lateral sequence and the course of the cutting speed to be determined.

Claims (4)

1. Additional attachment for a sewing machine for cutting edges of material, having a stationary blade and a movable blade, which is drivable by the needle bar of the machine and co-operates in a scissor-like manner with the stationary blade, said movable blade being in driving connection with the needle clamping screw of the needle bar via a pivotal lever mechanism, and the stationary and movable blades together forming a cutting plane, characterised in that the pivotal lever mechanism comprises a drive cam support (6), which is provided with a bifurcated driver (5), and a blade support (7) which supports the movable blade (17) and engages in the drive cam support (6), the drive cam support (6) being pivotably mounted in one particular plane on a first rotary axle (9), and the blade support (7) being pivotably mounted in another particular plane on a second rotary axle (axle pin 11), said planes being disposed at an axial spacing from the cutting plane and forming a clearance for the portion of material to pass between the cutting plane of the two blades (17, 21) and the pivotal planes of the drive cam support (6) and the blade support (7).
2. Additional attachment for a sewing machine according to claim 1, characterised in that the blade (17) has a U-shaped configuration, the first leg forming the cutting portion (16) and being held by a connection-piece, which supports the first leg, at a spacing from the pivotal plane of the blade support (7) which is formed by the second leg.
3. Additional attachment for a sewing machine according to claim 1, characterised in that the blade (17) is adjustably mounted on the blade support (7).
4. Additional attachment for a sewing machine according to claim 1, characterised in that the blade (17), together with the blade support (7), abuts resiliently against the cutting edge (20) of the stationary blade (21).
EP83810343A 1982-09-15 1983-07-29 Sewing machine accessory Expired EP0106795B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83810343T ATE20095T1 (en) 1982-09-15 1983-07-29 ADDITIONAL DEVICE FOR SEWING MACHINE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH545382 1982-09-15
CH5453/82 1982-09-15

Publications (2)

Publication Number Publication Date
EP0106795A1 EP0106795A1 (en) 1984-04-25
EP0106795B1 true EP0106795B1 (en) 1986-05-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP83810343A Expired EP0106795B1 (en) 1982-09-15 1983-07-29 Sewing machine accessory

Country Status (9)

Country Link
US (1) US4463693A (en)
EP (1) EP0106795B1 (en)
JP (1) JPS5964095A (en)
KR (1) KR860001538B1 (en)
AT (1) ATE20095T1 (en)
AU (1) AU556409B2 (en)
DE (1) DE3363753D1 (en)
NZ (1) NZ205211A (en)
ZA (1) ZA836143B (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4625663A (en) * 1985-02-05 1986-12-02 Mikio Mori Work cutting attachment for zigzag sewing machines
DE10066310B4 (en) * 1999-12-16 2018-01-04 Juki Corp. Thread cutter for a sewing machine
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ATE20095T1 (en) 1986-06-15
ZA836143B (en) 1984-04-25
DE3363753D1 (en) 1986-07-03
EP0106795A1 (en) 1984-04-25
AU1807883A (en) 1984-03-22
JPS5964095A (en) 1984-04-11
KR840006028A (en) 1984-11-21
KR860001538B1 (en) 1986-10-02
AU556409B2 (en) 1986-10-30
NZ205211A (en) 1985-08-30
US4463693A (en) 1984-08-07

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