EP0278967B1 - Sewing machine for sewing a rubber strip - Google Patents

Sewing machine for sewing a rubber strip Download PDF

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Publication number
EP0278967B1
EP0278967B1 EP87905611A EP87905611A EP0278967B1 EP 0278967 B1 EP0278967 B1 EP 0278967B1 EP 87905611 A EP87905611 A EP 87905611A EP 87905611 A EP87905611 A EP 87905611A EP 0278967 B1 EP0278967 B1 EP 0278967B1
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EP
European Patent Office
Prior art keywords
foot
presser
sewing machine
sewing
braking device
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 - Lifetime
Application number
EP87905611A
Other languages
German (de)
French (fr)
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EP0278967A1 (en
Inventor
Pantelis Bozoglou
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Individual
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Individual
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Publication of EP0278967A1 publication Critical patent/EP0278967A1/en
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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B35/00—Work-feeding or -handling elements not otherwise provided for
    • D05B35/06—Work-feeding or -handling elements not otherwise provided for for attaching bands, ribbons, strips, or tapes or for binding
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B29/00—Pressers; Presser feet
    • D05B29/06—Presser feet
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2207/00—Use of special elements
    • D05D2207/02—Pneumatic or hydraulic devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2207/00—Use of special elements
    • D05D2207/02—Pneumatic or hydraulic devices
    • D05D2207/04—Suction or blowing devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2303/00—Applied objects or articles
    • D05D2303/02—Tape
    • D05D2303/04—Tape elastic
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2305/00—Operations on the work before or after sewing
    • D05D2305/02—Folding
    • D05D2305/04—Folding longitudinally to the sewing direction
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2305/00—Operations on the work before or after sewing
    • D05D2305/08—Cutting the workpiece
    • D05D2305/12—Cutting the workpiece transversally

Definitions

  • the invention relates to a sewing machine for sewing a rubber band according to the preamble of claim 1.
  • the separating device for cutting through the rubber band is arranged in the area between the braking device and the inlet opening of the presser foot.
  • an additional braking device is also provided between the separating device and the presser foot, to which a drive is assigned. This additional braking device is during the sewing of the rubber band ineffective and only becomes effective immediately before actuation of the separating device in order to keep the cut off rear end of the rubber band under tension.
  • the invention is therefore based on the object of developing a generic sewing machine in such a way that after cutting off the rear end of the respectively sewn-on rubber band, it is not necessary to re-insert the rubber band into the inlet opening of the presser foot.
  • the sewing machine shown schematically in Fig. 1 in side view is particularly suitable for sewing a rubber band to a tubular end portion of a garment made of an elastic textile material for binding an endless, elastic waistband.
  • a base plate 10 serving as a support for the sewing material is rigidly connected to the gesture of the sewing machine.
  • a feed dog 12 for the advancement of the sewing material is movably mounted in an opening of the base plate 10.
  • the base plate 10 is also provided with an opening 14 for receiving a sewing needle 16.
  • the electrical drive for the feed dog 12 and the sewing needle 16 is designed in a known manner and is not shown in the drawing for reasons of clarity.
  • a presser foot 18 is mounted in the gesture of the sewing machine so that it can be moved up and down at right angles to the base plate 10.
  • the presser foot 18 is provided in the front area with an inlet opening 22 for a rubber band 24 which is supplied from a supply (not shown).
  • a separating device 26 for cutting the rubber band, the construction of which will be explained in more detail below.
  • the separating device 26 comprises a cylinder 30, which in a sleeve 32 is rotatably mounted.
  • the sleeve 32 is inserted in the presser foot 18 in a rotationally fixed manner and has two diametrically opposite slots 34, 36, which are aligned with an inlet opening 22 and with an outlet opening of the presser foot 18. If the presser foot 18 does not have its own outlet opening, then this is bidded by the slot 36 of the sleeve 32.
  • the cylinder 30 is penetrated by a channel 38, the walls of which are inclined like a funnel on the inlet side.
  • a cutting knife 40 is arranged in the presser foot 18, the cutting edge of which is located next to the outlet slot 36 of the sleeve 32.
  • a pneumatic cylinder 42 which is supported on the frame of the machine and whose piston rod 44 is articulated to a radially projecting arm of the cylinder 30, serves to rotate the cylinder 30 relative to the sleeve 32.
  • the piston rod 44 has a length such that the up and down movement of the presser foot 18 relative to the base plate 10 does not result in any significant rotation of the cylinder 30.
  • a braking device 48 is provided at some distance above the presser foot 18, which at the same time has the function of a guiding device.
  • the braking device 48 has two clamping bodies 50 and 52 that receive the rubber band 24 between them.
  • the one provided with an opening for feeding the rubber band 24 Clamping body 52 is designed in the manner of a double-armed lever and pivotally connected to the clamping body 50.
  • the clamping body 52 is loaded with the force of a compression spring 54 against the clamping body 50.
  • the biasing force of the compression spring 54 can be adjusted in order to be able to adapt the braking force exerted by the two clamping bodies 50 and 52 to the rubber band 24 fed between them, and thus the tension of the rubber band, to the respective requirements.
  • the free end of the movable clamping body 52 lying away from the presser foot 18 is connected in an articulated manner to the piston rod of a pneumatic cylinder 56, which in turn is supported on the clamping body 50. By pulling the piston rod into the pneumatic cylinder 56, the movable clamping body 52 can consequently be pivoted against the force of the compression spring 54 in order to release the rubber band 24 so that it can relax.
  • the clamping body 50 is pivotally connected in the feed direction of the textile material 46 behind the presser foot 18 and approximately at its height to the frame of the machine. This mounting of the clamping body 50 ensures that its free end moves substantially in the direction of the inlet opening 22 of the presser foot 19 when it is pivoted.
  • a pneumatic cylinder 58 which is supported on the frame of the machine and whose piston rod is articulated to the clamping body 50 at a distance from its pivot point, serves to pivot the clamping body 50.
  • a compressed air nozzle 60 is arranged in the base plate 10 and faces the front end of the presser foot 18 and is inclined to the underside thereof. Due to the compressed air flowing out of the nozzle 60, the front end of the rubber band 24 emerging from the raised presser foot 18 is redirected towards the rear of the feed dog 12.
  • a solenoid valve (not shown) is arranged which only releases the through foot when the presser foot 18 is in its raised position.
  • the compressed air nozzle 60 it is not necessary for the compressed air nozzle 60 to be arranged in the base plate 10 in the manner shown, but other arrangements are also possible which ensure that the free end of the rubber band is deflected backwards by the compressed air flow against the underside of the presser foot.
  • the pneumatic cylinders 20, 42, 56 and 58 are connected to a compressed air source via lines (not shown). Solenoid valves are arranged in each of these lines and can be controlled by the operator with a single foot pedal. By correspondingly actuating the foot pedal, on the one hand the solenoid valves for the pneumatic cylinders 42 and 56 can be opened and closed together and on the other hand the solenoid valves for the pneumatic cylinders 20 and 58 can be opened and closed together.
  • the arrangement is such that the pressure change in the pneumatic cylinders 42 and 58 compared to the pneumatic cylinders 56 and 20 takes place with a certain delay. This can be achieved in a simple manner by providing the lines leading to the pneumatic cylinders 42 and 58 with throttles.
  • the presser foot 18 is in its raised position, the engaged braking device 48 in the lowered position and the separating device 26 in the inactive position and that a free end of the rubber band 24 protrudes from the underside of the presser foot 18. Since the compressed air nozzle 60 is connected to the compressed air source in the raised state of the presser foot 18, this is eliminated the presser foot 18 projecting free end of the rubber band 24 is deflected backwards by the escaping compressed air against the underside of the presser foot. By corresponding actuation of the foot switch, the pneumatic cylinder 20 is then pressurized with compressed air in order to lower the presser foot 18, so that it presses the rubber band 24 against the fabric 46 lying on the base plate 10 and thus holds it there.
  • the braking device 48 Since the braking device 48 is engaged, that is to say the movable clamping body 52 is loaded with the force of the compression spring 54 against the clamping body 50, the supply of the rubber band 24 is braked and is thereby fed in a stretched state. Since the textile material 46 is the tubular end section of a piece of clothing, for example the leg section of a swimsuit or the like, an elastic waistband is created in this way. Shortly before the rubber band sewn onto the fabric with its front end overlaps the supplied rubber band, that is to say at the front end of the presser foot 18, the pneumatic cylinder 56 is acted upon by corresponding actuation of the foot switch with compressed air in order to disengage the braking device 48 so that the front one End region of the supplied rubber band 24 is de-energized.
  • the pneumatic cylinder used to actuate the separating device can be rigidly attached to a swivel arm carrying the presser foot.
  • the pneumatic cylinder makes ae movements of the swivel arm and thus of the presser foot without influencing the separating device.
  • This variation like the exemplary embodiment shown, enables the constructive advantage that the area in front of and on both sides of the presser foot remains free. The operator can therefore monitor the sewing process optically and move the fabric directly to the presser foot with his fingers. This enables a very precise sewing of the rubber band along the edge of the fabric.

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

Abstract

Sewing machine for sewing a rubber strip to a tubular end-piece of a garment made from an elastic textile material in order to produce an endless elastic band. The sewing machine comprises a sewing foot (18) with an insertion opening (22) for the elastic band (24), a braking device (48) to resist the insertion movement of the elastic band and provided with two clamping elements (50, 52) which grip the band, and a cutting system (26) which can be motor-driven, in order to cut the rubber band. In order to prevent, after said cutting, the reintroduction of band (24) into the insertion opening (22) of the sewing foot (18), the cutting system (26) is arranged behind the insertion aperture (22) of the sewing foot (18) on the latter, and a drive system (56) is associated with the braking device (48) in order to increase the gap between the two clamping elements (50, 52) immediately before actuation of the cutting system (26).

Description

Die Erfindung betrifft eine Nähmaschine zum Annähen eines Gummibandes nach dem Oberbegriff des Anspruchs 1.The invention relates to a sewing machine for sewing a rubber band according to the preamble of claim 1.

Bei einer aus der DE-OS 34 10 181 hervorgehenden Nähmaschine, die bei der Bidung des Oberbegriffs des Anspruchs 1 berücksichtigt wurde, ist die Trenneinrichtung zum Durchschneiden des Gummibandes in dem Bereich zwischen der Bremseinrichtung und der Eintrittsöffnung des Drückerfußes angeordnet. Bei dieser bekannten Nähmaschine ist ferner zwischen der Trenneinrichtung und dem Drückerfuß eine zusätzliche Bremseinrichtung vorgesehen, der ein Antrieb zugeordnet ist. Diese zusätzliche Bremseinrichtung ist während des Annähens des Gummibandes unwirksam und wird erst unmittebar vor Betätigung der Trenneinrichtung wirksam, um das abgeschnittene hintere Ende des Gummibandes unter Spannung zu halten. Nach dem Annähen des abgeschnittenen hinteren Endes des Gummibandes an das Kleidungsstück ist es erforderlich, das freie vordere Ende des Gummibandes in die Eintrittsöffnung des Drückerfußes einzuführen, damit es beim nachfolgenden Absenken desselben zusammen mit dem Kleidungsstück von dem Transporteur vorwärtsbewegt wird. Der Umstand, daß nach der Bildung eines jeden endlosen, elastischen Bundes das Gummiband erneut in die Eintrittsöffnung des Drückerfußes eingeführt werden muß, stet jedoch eine erhebliche Arbeitsverzögerung dar.In a sewing machine resulting from DE-OS 34 10 181, which was taken into account in the preamble of claim 1, the separating device for cutting through the rubber band is arranged in the area between the braking device and the inlet opening of the presser foot. In this known sewing machine, an additional braking device is also provided between the separating device and the presser foot, to which a drive is assigned. This additional braking device is during the sewing of the rubber band ineffective and only becomes effective immediately before actuation of the separating device in order to keep the cut off rear end of the rubber band under tension. After sewing the cut back end of the rubber band onto the garment, it is necessary to insert the free front end of the rubber band into the inlet opening of the presser foot so that when it is subsequently lowered, it is moved forward by the feed dog together with the garment. The fact that after the formation of each endless, elastic band the rubber band has to be reinserted into the inlet opening of the presser foot, however, represents a considerable delay in work.

Der Erfindung liegt somit die Aufgabe zugrunde, eine gattungsgemäße Nähmaschine dahingehend weiterzubilden, daß nach dem Abschneiden des hinteren Endes des jeweils angenähten Gummibandes ein erneutes Einführen des Gummibandes in die Eintrittsöffnung des Drückerfußes entbehrlich ist.The invention is therefore based on the object of developing a generic sewing machine in such a way that after cutting off the rear end of the respectively sewn-on rubber band, it is not necessary to re-insert the rubber band into the inlet opening of the presser foot.

Diese Aufgabe wird bei einer Nähmaschine nach dem Oberbegriff des Anspruchs 1 durch dessen kennzeichnende Merkmale gelöst.This object is achieved in a sewing machine according to the preamble of claim 1 by the characterizing features.

Mit der Erfindung wird erreicht, daß nach dem Abschneiden des hinteren Endes des jeweils angenähten Gummibandes der vordere Endbereich des vom Vorrat kommenden Gummibandes in dem Drückerfuß verbleibt und daher nicht erneut in denselben eingeführt werden muß.With the invention it is achieved that after cutting off the rear end of the rubber band sewn on, the front end region of the rubber band coming from the supply remains in the presser foot and therefore does not have to be reinserted into the same.

Zweckmäßige und weiterhin vorteilhafte Weiterbildungen des Gegenstandes des Anspruchs 1 sind in den Unteransprüchen (Ansprüche 2 bis 9) aufgeführt.Useful and further advantageous developments of the subject matter of claim 1 are listed in the subclaims (claims 2 to 9).

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend näher erläutert. Es zeigen:

  • Fig. 1 eine schematische Darstellung der wesentlichen Bestandteile einer erfindungsgemäßen Nähmaschine und
  • Fig. 2a und 2b schematische Darstellungen der Trenneinrichtung zum Abschneiden des Gummibandes.
An embodiment of the invention is shown in the drawing and is explained in more detail below. Show it:
  • Fig. 1 is a schematic representation of the essential components of a sewing machine according to the invention and
  • 2a and 2b are schematic representations of the separating device for cutting off the rubber band.

Die in Fig. 1 in der Seitenansicht schematisch dargestellte Nähmaschine eignet sich besonders zurm Annähen eines Gummibandes an einen schauchförmigen Endabschnitt eines Kleidungsstückes aus einem elastischen textien Stoff zur Bidung eines endlosen, elastischen Bundes. Eine as Unterage für das Nähgut dienende Grundpatte 10 ist mit dem Geste der Nähmaschine starr verbunden. In einer Öffnung der Grundpatte 10 ist in bekannter Weise ein Transporteur 12 für den Vorschub des Nähgutes beweglich gelagert. Die Grundpatte 10 ist ferner mit einer Öffnung 14 zur Aufnahme einer Nähnadel 16 versehen. Der elektrische Antrieb für den Transporteur 12 und die Nähnadel 16 ist in bekannter Weise ausgestaltet und aus Gründen der Klarheit in der Zeichnung nicht dargestet. Ein Drückerfuß 18 ist in dem Geste der Nähmaschine rechtwinklig zur Grundpatte 10 auf- und abbewegbar gelagert. Zum Antrieb des Drückerfußes 18 dient ein Pneumatikzylinder 20, der am Geste der Nähmaschine befestigt ist und dessen Kobenstange mit dem Drückerfuß 18 verbunden ist. Der Drückerfuß 18 ist im vorderen Bereich mit einer Eintrittsöffnung 22 für ein Gummiband 24 versehen, das von einem (nicht gezeigten) Vorrat zugeführt wird. Im Drückerfuß 18 ist eine Trenneinrichtung 26 zum Zerschneiden des Gummibandes angeordnet, deren Konstruktion nachfolgend noch näher erläutert wird.The sewing machine shown schematically in Fig. 1 in side view is particularly suitable for sewing a rubber band to a tubular end portion of a garment made of an elastic textile material for binding an endless, elastic waistband. A base plate 10 serving as a support for the sewing material is rigidly connected to the gesture of the sewing machine. In a known manner, a feed dog 12 for the advancement of the sewing material is movably mounted in an opening of the base plate 10. The base plate 10 is also provided with an opening 14 for receiving a sewing needle 16. The electrical drive for the feed dog 12 and the sewing needle 16 is designed in a known manner and is not shown in the drawing for reasons of clarity. A presser foot 18 is mounted in the gesture of the sewing machine so that it can be moved up and down at right angles to the base plate 10. A pneumatic cylinder 20, which is attached to the gesture of the sewing machine and whose piston rod is connected to the presser foot 18, is used to drive the presser foot 18. The presser foot 18 is provided in the front area with an inlet opening 22 for a rubber band 24 which is supplied from a supply (not shown). In the presser foot 18 there is a separating device 26 for cutting the rubber band, the construction of which will be explained in more detail below.

Wie dies insbesondere aus den Fig. 2a und 2b ersichtlich ist, umfaßt die Trenneinrichtung 26 einen Zylinder 30, der in einer Hülse 32 drehbar gelagert ist. Die Hülse 32 ist in den Drückerfuß 18 drehfest eingesetzt und weist zwei einander diametra gegenüberliegende Schlitze 34, 36 auf, die mit einer Eintrittsöffnung 22 bzw. mit einer Austrittsöffnung des Drükkerfußes 18 fluchten. Falls der Drückerfuß 18 keine eigene Austrittsöffnung aufweist, dann wird diese von dem Schlitz 36 der Hülse 32 gebidet. Der Zylinder 30 ist von einem Kana 38 durchsetzt, dessen Wände auf der Eintrittsseite trichterartig geneigt sind. Dies bedeutet, daß die Austrittsseite des Kanas 38 nur in einer bestimmten Winkelstellung des Zylinders 30 mit dem Austrittsschlitz 36 der Hülse 32 fluchtet, wogegen die Eintrittsseite des Kanas 38 infolge der konischen Erweiterung über einen größeren Winkebereich des Zylinders 30 mit dem Eintrittsschlitz 34 der Hülse 32 fluchtet. Im Drückerfuß 18 ist ein Schneidmesser 40 angeordnet, dessen Schneidkante sich neben dem Austrittsschlitz 36 der Hülse 32 befindet. Zum Verdrehen des Zylinders 30 gegenüber der Hülse 32 dient ein am Gestell der Maschine abgestützter Pneumatikzylinder 42, dessen Kolbenstange 44 mit einem radial abstehenden Arm des Zylinders 30 gelenkig verbunden ist. Die Kolbenstange 44 hat dabei eine solche Länge, daß die Auf- und Abbewegung des Drückerfußes 18 gegenüber der Grundpatte 10 keine nennenswerte Verdrehung des Zylinders 30 zur Folge hat.As can be seen in particular from FIGS. 2a and 2b, the separating device 26 comprises a cylinder 30, which in a sleeve 32 is rotatably mounted. The sleeve 32 is inserted in the presser foot 18 in a rotationally fixed manner and has two diametrically opposite slots 34, 36, which are aligned with an inlet opening 22 and with an outlet opening of the presser foot 18. If the presser foot 18 does not have its own outlet opening, then this is bidded by the slot 36 of the sleeve 32. The cylinder 30 is penetrated by a channel 38, the walls of which are inclined like a funnel on the inlet side. This means that the outlet side of the channel 38 is aligned with the outlet slot 36 of the sleeve 32 only in a certain angular position of the cylinder 30, whereas the inlet side of the channel 38 due to the conical widening over a larger angular range of the cylinder 30 with the inlet slot 34 of the sleeve 32 flees. A cutting knife 40 is arranged in the presser foot 18, the cutting edge of which is located next to the outlet slot 36 of the sleeve 32. A pneumatic cylinder 42, which is supported on the frame of the machine and whose piston rod 44 is articulated to a radially projecting arm of the cylinder 30, serves to rotate the cylinder 30 relative to the sleeve 32. The piston rod 44 has a length such that the up and down movement of the presser foot 18 relative to the base plate 10 does not result in any significant rotation of the cylinder 30.

Damit das von einem (nicht gezeigten) Vorrat zugeführte Gummiband 24 von der Nähnadel 16 an den zwischen dem Transporteur 12 und dem Drückerfuß 18 zugeführten textilen Stoff 46 angenäht werden kann, ist es erforderlich, daß das Gummiband 24 in gedehntem Zustand zugeführt wird. Zu diesem Zweck ist in einigem Abstand über dem Drückerfuß 18 eine Bremseinrichtung 48 vorgesehen, die zugleich die Funktion einer Führungseinrichtung hat. Die Bremseinrichtung 48 weist zwei das Gummiband 24 zwischen sich aufnehmende Klemmkörper 50 und 52 auf. Der mit einer Öffnung für die Zuführung des Gummibandes 24 versehene Klemmkörper 52 ist in der Art eines doppelarmigen Hebels ausgebildet und mit dem Klemmkörper 50 schwenkbar verbunden. Der Klemmkörper 52 ist mit der Kraft einer Druckfeder 54 gegen den Klemmkörper 50 belastet. Die Vorspannkraft der Druckfeder 54 ist einstellbar, um die von den beiden Klemmkörpern 50 und 52 auf das zwischen diesen zugeführte Gummiband 24 ausgeübte Bremskraft und damit die Spannung des Gummibandes den jeweiligen Erfordernisses anpassen zu können. Das vom Drückerfuß 18 abliegende freie Ende des beweglichen Klemmkörpers 52 ist mit der Kobenstange eines Pneumatikzylinders 56 gelenkig verbunden, der sich seinerseits am Klemmkörper 50 abstützt. Durch Einziehen der Kobenstange in den Pneumatikzylinder 56 kann demzufolge der bewegliche Klemmkörper 52 entgegen der Kraft der Druckfeder 54 verschwenkt werden, um das Gummiband 24 freizugeben, so daß sich dieses entspannen kann.In order for the elastic band 24 supplied from a supply (not shown) to be sewn from the sewing needle 16 onto the textile material 46 fed between the feed dog 12 and the presser foot 18, it is necessary for the elastic band 24 to be supplied in a stretched state. For this purpose, a braking device 48 is provided at some distance above the presser foot 18, which at the same time has the function of a guiding device. The braking device 48 has two clamping bodies 50 and 52 that receive the rubber band 24 between them. The one provided with an opening for feeding the rubber band 24 Clamping body 52 is designed in the manner of a double-armed lever and pivotally connected to the clamping body 50. The clamping body 52 is loaded with the force of a compression spring 54 against the clamping body 50. The biasing force of the compression spring 54 can be adjusted in order to be able to adapt the braking force exerted by the two clamping bodies 50 and 52 to the rubber band 24 fed between them, and thus the tension of the rubber band, to the respective requirements. The free end of the movable clamping body 52 lying away from the presser foot 18 is connected in an articulated manner to the piston rod of a pneumatic cylinder 56, which in turn is supported on the clamping body 50. By pulling the piston rod into the pneumatic cylinder 56, the movable clamping body 52 can consequently be pivoted against the force of the compression spring 54 in order to release the rubber band 24 so that it can relax.

Wie dies aus Fig. 1 der Zeichnung hervorgeht, ist der Klemmkörper 50 in Zuführrichtung des textilen Stoffes 46 hinter dem Drückerfuß 18 und näherungsweise auf dessen Höhe mit dem Gestell der Maschine schwenkbar verbunden. Durch diese Lagerung des Klemmkörpers 50 wird erreicht, daß sich sein freies Ende bei einer Verschwenkung desselben im wesentlichen in Richtung auf die Eintrittsöffnung 22 des Drückerfußes 19 bewegt. Zum Verschwenken des Klemmkörpers 50 dient ein Pneumatikzylinder 58, der sich am Gestell der Maschine abstützt und dessen Kobenstange mit dem Klemmkörper 50 im Abstand von dessen Drehpunkt gelenkig verbunden ist.As can be seen from Fig. 1 of the drawing, the clamping body 50 is pivotally connected in the feed direction of the textile material 46 behind the presser foot 18 and approximately at its height to the frame of the machine. This mounting of the clamping body 50 ensures that its free end moves substantially in the direction of the inlet opening 22 of the presser foot 19 when it is pivoted. A pneumatic cylinder 58, which is supported on the frame of the machine and whose piston rod is articulated to the clamping body 50 at a distance from its pivot point, serves to pivot the clamping body 50.

In der Grundpatte 10 ist eine Druckluftdüse 60 angeordnet, die dem vorderen Ende des Drückerfußes 18 zugekehrt und zur Unterseite desselben geneigt angeordnet ist. Durch die aus der Düse 60 ausströmende Druckluft so das aus dem angehobenen Drückerfuß 18 austretende vordere Ende des Gummibandes 24 nach hinten zum Transporteur 12 hin umgelenkt werden. In der die Druckluftdüse 60 mit einer Druckluftguelle verbindenden Leitung ist ein (nicht gezeigtes) Magnetventil angeordnet, das den Durchfuß nur dann freigibt, wenn sich der Drückerfuß 18 in seiner angehobenen Stellung befindet. Selbstverständlich ist es nicht erforderlich, daß die Druckluftdüse 60 in der gezeigten Weise in der Grundpatte 10 angeordnet ist, sondern es sind auch andere Anordnungen möglich, die gewährleisten, daß das freie Ende des Gummibandes vom Druckluftstrom nach hinten gegen die Unterseite des Drückerfußes umgelenkt wird.A compressed air nozzle 60 is arranged in the base plate 10 and faces the front end of the presser foot 18 and is inclined to the underside thereof. Due to the compressed air flowing out of the nozzle 60, the front end of the rubber band 24 emerging from the raised presser foot 18 is redirected towards the rear of the feed dog 12. In the Compressed air nozzle 60 with a line connecting compressed air source, a solenoid valve (not shown) is arranged which only releases the through foot when the presser foot 18 is in its raised position. Of course, it is not necessary for the compressed air nozzle 60 to be arranged in the base plate 10 in the manner shown, but other arrangements are also possible which ensure that the free end of the rubber band is deflected backwards by the compressed air flow against the underside of the presser foot.

Die Pneumatikzylinder 20, 42, 56 und 58 sind über (nicht gezeigte) Leitungen mit einer Druckluftquelle verbunden. In diesen Leitungen sind jeweils Magnetventile angeordnet, die von der Bedienungsperson mit einem einzigen Fußpedal gesteuert werden können. Durch entsprechende Betätigung des Fußpedals können einerseits die Magnetventile für die Pneumatikzylinder 42 und 56 gemeinsam geöffnet und geschossen und andererseits die Magnetventile für die Pneumatikzylinder 20 und 58 gemeinsam geöffnet und geschlossen werden. Die Anordnung ist dabei so getroffen, daß die Druckänderung in den Pneumatikzylindern 42 und 58 gegenüber den Pneumatikzylindern 56 und 20 mit einer gewissen Verzögerung erfolgt. Dies kann auf einfache Weise dadurch bewirkt werden, indem die zu den Pneumatikzylindern 42 und 58 führenden Leitungen mit Drosseln versehen sind.The pneumatic cylinders 20, 42, 56 and 58 are connected to a compressed air source via lines (not shown). Solenoid valves are arranged in each of these lines and can be controlled by the operator with a single foot pedal. By correspondingly actuating the foot pedal, on the one hand the solenoid valves for the pneumatic cylinders 42 and 56 can be opened and closed together and on the other hand the solenoid valves for the pneumatic cylinders 20 and 58 can be opened and closed together. The arrangement is such that the pressure change in the pneumatic cylinders 42 and 58 compared to the pneumatic cylinders 56 and 20 takes place with a certain delay. This can be achieved in a simple manner by providing the lines leading to the pneumatic cylinders 42 and 58 with throttles.

Nachstehend wird davon Arbeitsweise der vorstehend beschriebenen Nähmaschine näher erläutert.Operation of the sewing machine described above will be explained in more detail below.

Es wird davon ausgegangen, daß sich der Drückerfuß 18 in seiner angehobenen Stellung, die eingerückte Bremseinrichtung 48 in der abgesenkten Stellung und die Trenneinrichtung 26 in der unwirksamen Stellung befinden und daß ein freies Ende des Gummibandes 24 aus der Unterseite des Drückerfußes 18 herausragt. Da die Druckluftdüse 60 im angehobenen Zustand des Drükkerfußes 18 mit der Druckluftquelle verbunden ist, wird das aus dem Drückerfuß 18 herausragende freie Ende des Gummibandes 24 von der austretenden Druckluft nach hinten gegen die Unterseite des Drückerfußes umgelenkt. Durch entsprechende Betätigung des Fußschalters wird sodann der Pneumatikzylinder 20 mit Druckluft beaufschlagt, um den Drückerfuß 18 abzusenken, so daß dieser das Gummiband 24 an den auf der Grundpatte 10 liegenden textien Stoff 46 andrückt und somit festhält. Diese Betätigung des Fußschalters hat zur Folge, daß der Pneumatikzylinder 58 gleichfalls, aber mit einer gewissen Verzögerung mit Druckluft beaufschlagt wird, wodurch die gesamte Bremseinrichtung 48 vom Drückerfuß 18 weg nach oben verschwenkt und demzufolge der vordere Endbereich des Gummibandes 24 gespannt wird. Während diese Positionen des Drückerfußes 18 und der Bremseinrichtung 48 beibeibehalten werden, wird durch entsprechendes Betätigen des Fußschalters der Antrieb für den Transporteur 12 und für die Nähnadel 16 eingeschaltet, so daß das in gedehntem Zustand gehaltene Gummiband 24 mit dem textien Stoff 46 fortlaufend vernäht wird. Da die Bremseinrichtung 48 eingerückt, d.h. der bewegliche Klemmkörper 52 mit der Kraft der Druckfeder 54 gegen den Klemmkörper 50 belastet ist, wird die Zufuhr des Gummibandes 24 gebremst und dieses dadurch in gedehntem Zustand zugeführt. Da es sich bei dem textilen Stoff 46 um den schlauchförmigen Endabschnitt eines Kleidungsstückes, beispielsweise den Beinabschnitt eines Badeanzugs od. dgl. handelt, wird auf diese Weise ein elastischer Bund geschaffen. Kurz bevor das an dem Stoff angenähte Gummiband mit seinem vorderen Ende das zugeführte Gummiband überlappt, sich also am vorderen Ende des Drückerfußes 18 befindet, wird durch entsprechende Betätigung des Fußschalters der Pneumatikzylinder 56 mit Druckluft beaufschlagt, um die Bremseinrichtung 48 auszurücken, so daß der vordere Endbereich des zugeführten Gummibandes 24 spannungslos wird. Diese Betätigung des Fußschalters hat zur Folge, daß der Pneumatikzylinder 42 gleichfalls, aber mit einer gewissen Verzögerung mit Druckluft beaufschlagt wird, so daß der Zylinder 30 gegenüber der Hülse 32 der Trenneinrichtung 26 aus der in Fig. 2a in die in Fig. 2b gezeigte Stellung verdreht wird. Das im Kana 38 des Zylinders 30 befindliche Gummiband wird daher gegen die Kante des Schneidmessers 40 gedrückt und durchtrennt. Der spannungslose hintere Endbereich des Gummibandes 24 wird sodann mit dem Stoff 46 vernäht, wobei er den in gedehntem Zustand angenähten vorderen Endbereich überlappt. Wegen des geringen Abstandes zwischen dem Schneidmesser 40 und der Nähnadel 16, der in der Praxis unter 20 mm liegen kann, ist eine sehr kurze Uberlappung des Gummibandes und eine entsprechende Materialersparnis möglich. Der Nähvorgang ist jetzt abgeschossen, und es wurde ein endloser elastischer Bund an dem Kleidungsstück gebidet. Durch entsprechendes Betätigen des Fußschalters werden die Antriebe des Transporteurs 12 und der Nähnadel 16 abgeschaltet und die Trenneinrichtung 26 wird in die unwirksame und die Bremseinrichtung 48 in die wirksame Stellung zurückgeführt. Sodann werden durch entsprechende Betätigung des Fußschalters die Pneumatikzylinder 20 und 58 mit Druckluft beaufschlagt, wodurch der Drückerfuß 18 angehoben und die gesamte Bremseinrichtung 48 mit einer gewissen Verzögerung nach unten verschwenkt wird. Das hat zur Folge, daß der nach wie vor im Drückerfuß befindliche vordere Endbereich des Gummibandes 24 nach unten aus diesem herausgeschoben und unter dem Einfluß der jetzt aus der Düse 60 ausströmenden Druckluft nach hinten gegen die Unterseite des Drückerfußes hin umgelenkt wird. Die Nähmaschine ist jetzt zur Ausführung eines erneuten Nähvorganges zur Ausbidung eines endlosen elastischen Bundes bereit.It is assumed that the presser foot 18 is in its raised position, the engaged braking device 48 in the lowered position and the separating device 26 in the inactive position and that a free end of the rubber band 24 protrudes from the underside of the presser foot 18. Since the compressed air nozzle 60 is connected to the compressed air source in the raised state of the presser foot 18, this is eliminated the presser foot 18 projecting free end of the rubber band 24 is deflected backwards by the escaping compressed air against the underside of the presser foot. By corresponding actuation of the foot switch, the pneumatic cylinder 20 is then pressurized with compressed air in order to lower the presser foot 18, so that it presses the rubber band 24 against the fabric 46 lying on the base plate 10 and thus holds it there. This actuation of the foot switch has the consequence that the pneumatic cylinder 58 is also acted upon, but with a certain delay, by compressed air, as a result of which the entire braking device 48 is pivoted upward away from the presser foot 18 and, consequently, the front end region of the rubber band 24 is tensioned. While these positions of the presser foot 18 and the braking device 48 are maintained, the drive for the feed dog 12 and for the sewing needle 16 is switched on by corresponding actuation of the foot switch, so that the elastic band 24 held in the stretched state is sewn continuously with the textile fabric 46. Since the braking device 48 is engaged, that is to say the movable clamping body 52 is loaded with the force of the compression spring 54 against the clamping body 50, the supply of the rubber band 24 is braked and is thereby fed in a stretched state. Since the textile material 46 is the tubular end section of a piece of clothing, for example the leg section of a swimsuit or the like, an elastic waistband is created in this way. Shortly before the rubber band sewn onto the fabric with its front end overlaps the supplied rubber band, that is to say at the front end of the presser foot 18, the pneumatic cylinder 56 is acted upon by corresponding actuation of the foot switch with compressed air in order to disengage the braking device 48 so that the front one End region of the supplied rubber band 24 is de-energized. This actuation of the foot switch has the consequence that the pneumatic cylinder 42 is also pressurized with compressed air with a certain delay, so that the cylinder 30 relative to the sleeve 32 the separating device 26 is rotated from the position in FIG. 2a to the position shown in FIG. 2b. The rubber band located in the channel 38 of the cylinder 30 is therefore pressed against the edge of the cutting knife 40 and severed. The tension-free rear end region of the elastic band 24 is then sewn to the fabric 46, overlapping the front end region sewn on in the stretched state. Because of the small distance between the cutting knife 40 and the sewing needle 16, which in practice can be less than 20 mm, a very short overlap of the rubber band and a corresponding material saving is possible. Sewing is now complete and an endless elastic waistband has been attached to the garment. By appropriate actuation of the foot switch, the drives of the feed dog 12 and the sewing needle 16 are switched off and the separating device 26 is returned to the ineffective position and the braking device 48 to the active position. The pneumatic cylinders 20 and 58 are then pressurized with compressed air by appropriate actuation of the foot switch, as a result of which the presser foot 18 is raised and the entire braking device 48 is pivoted downward with a certain delay. The result of this is that the front end region of the rubber band 24, which is still located in the presser foot, is pushed downwards out of the latter and is deflected backwards under the influence of the compressed air now flowing out of the nozzle 60 toward the underside of the presser foot. The sewing machine is now ready to perform another sewing operation to form an endless elastic waistband.

Abweichend von dem gezeigten Ausführungsbeispiel kann der zum Betätigen der Trenneinrichtung dienende Pneumatikzylinder an einem den Drückerfuß tragenden Schwenkarm starr befestigt sein. Der Pneumatikzylinder macht in diesem Fall ae Bewegungen des Schwenkarms und damit des Drückerfußes mit, ohne dabei die Trenneinrichtung zu beeinfußen.In a departure from the exemplary embodiment shown, the pneumatic cylinder used to actuate the separating device can be rigidly attached to a swivel arm carrying the presser foot. In this case, the pneumatic cylinder makes ae movements of the swivel arm and thus of the presser foot without influencing the separating device.

Diese Abwandung ermöglicht ebenso wie das gezeigte Ausführungsbeispiel den konstruktiven Vorteil, daß der Bereich vor und auf beiden Seiten des Drückerfußes frei bleibt. Die Bedienungsperson kann deshalb den Nähvorgang optisch einwandfrei überwachen und den Stoff mit den Fingern unmittebar an den Drückerfuß heranführen. Dadurch ist ein sehr genaues Annähen des Gummibandes längs des Stoffrandes möglich.This variation, like the exemplary embodiment shown, enables the constructive advantage that the area in front of and on both sides of the presser foot remains free. The operator can therefore monitor the sewing process optically and move the fabric directly to the presser foot with his fingers. This enables a very precise sewing of the rubber band along the edge of the fabric.

Claims (9)

1. A sewing machine for sewing a rubber tape on a tubular end-portion of an article of clothing, made of an elastic, textile material, in order to produce an endless, elastic band, this machine having a sewing needle, a presser-foot which presses the material to be sewn against a base plate, has an entry opening for the rubber tape and can be raised and lowered, by a motor, in relation to the base plate, a feed which is arranged in the base plate and is to feed the material to be sewn, a guiding device conveying the rubber tape to the presser-foot, a braking device working against the advancing movement of the rubber tape and having two clamping elements between which the rubber tape is gripped, and a detaching device which can be motor-driven, is arranged between the braking device and the sewing needle and is for the purpose of cutting through the rubber tape, characterized in that the detaching device (26) is arranged after the entry opening (22) in the presser-foot (18) and in the latter, and in that a drive (56) is associated with the braking device (48) in order to increase the spacing between the two clamping elements (50, 52) directly before actuation of the detaching device (26).
2. A sewing machine in accordance with Claim 1, characterized in that the detaching device (26) arranged in the presser-foot (18) is composed of both a cylinder (30) which is rotatably mounted in the presser-foot (18) and has a diagonal guiding slit (38) and a cutting knife (40) which is arranged on the presser-foot (18) in a stationary manner, and the detaching device has a drive (42) for rotational movement of the cylinder (30).
3. A sewing machine in accordance with Claim 1 or 2, characterized in that a compressed-air nozzle (60) is provided which is directed in the conveying direction of the rubber tape (24) and towards the lower side of the presser-foot (18).
4. A sewing machine in accordance with any one of Claims 1 to 3, characterized in that the drives (42, 56) serving to operate the detaching device (26) and to engage and disengage the braking device (48) are jointly controllable.
5. A sewing machine in accordance with Claim 4, characterized in that the drives (42, 56) are controllable by means of a foot switch.
6. A sewing machine in accordance with any one of Claims 1 to 5, characterized in that the braking device (48) is arranged so that its distance from the presser-foot (18) is variable, and in that a second drive (58) is associated with the braking device (48), which drive induces the latter to approach or move away from the presser-foot (18).
7. A sewing machine in accordance with Claim 6, characterized in that control means are provided so that the movement of the braking device (48) has a time lag in relation to the movement of the presser-foot (18).
8. A sewing machine in accordance with Claim 6 or 7, characterized in that the drives (20, 58) serving to raise and lower the presser-foot (18) and to move the braking device (48) to-and-fro are jointly controllable.
9. A sewing machine in accordance with Claim 8, characterized in that the drives (20, 58) are controllable by means of a foot switch.
EP87905611A 1986-08-25 1987-08-25 Sewing machine for sewing a rubber strip Expired - Lifetime EP0278967B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3628829 1986-08-25
DE3628829A DE3628829C1 (en) 1986-08-25 1986-08-25 Sewing machine for sewing on a rubber band

Publications (2)

Publication Number Publication Date
EP0278967A1 EP0278967A1 (en) 1988-08-24
EP0278967B1 true EP0278967B1 (en) 1991-05-29

Family

ID=6308127

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Application Number Title Priority Date Filing Date
EP87905611A Expired - Lifetime EP0278967B1 (en) 1986-08-25 1987-08-25 Sewing machine for sewing a rubber strip

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US (1) US4909165A (en)
EP (1) EP0278967B1 (en)
JP (1) JPH01500644A (en)
DE (1) DE3628829C1 (en)
WO (1) WO1988001660A2 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3706996C1 (en) * 1986-10-22 1988-07-21 Union Speical Gmbh Cutting device on a sewing machine
DE3642863A1 (en) * 1986-12-16 1988-06-30 Daimler Benz Ag Accessory device for sewing machines
IT1231885B (en) * 1987-10-09 1992-01-15 Rockwell Rimoldi Spa MULTI-PURPOSE SEWING MACHINE.
US5202311A (en) * 1988-08-19 1993-04-13 Children's Medical Center Corporation Stabilized fgf composition
JPH08332291A (en) * 1995-06-07 1996-12-17 Singer Nikko Kk Presser device for sewing machine
DE10023537A1 (en) * 2000-05-13 2001-11-22 Schips Ag Naehautomation Tueba Sewing machine for stitching an elastic band has a supply and a feed/cutter unit which moves in and out of the stitching zone to feed the band to the presser foot and cut the stitched band
JP2014087441A (en) * 2012-10-30 2014-05-15 Brother Ind Ltd Sewing machine
CN106048915A (en) * 2016-08-09 2016-10-26 厦门市宏迪机电设备有限公司 Rotating and turning structure of elastic ribbon sewing machine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3094089A (en) * 1960-11-03 1963-06-18 Shuman Abraham Presser foot
US3149589A (en) * 1961-08-03 1964-09-22 Sr Gilbert Fowler Combination sewing machine ribbon cutter and cloth trimming attachment
US3468269A (en) * 1967-05-01 1969-09-23 Frederic P Worthen Method and apparatus for cutting tape in sewing machine
US3847099A (en) * 1972-08-18 1974-11-12 Pfaff Ind Masch Ribbon feeding attachment for sewing machines
IT1002361B (en) * 1973-12-27 1976-05-20 Rimoldi Virginio E C Spa DEVICE FOR CUTTING AND INSERTING A SLING UNDER THE FEET NO PRESSER OF A SEWING MACHINE
DE3410181C2 (en) * 1984-03-20 1986-07-17 Helmut Tübach Schips sewing machine

Also Published As

Publication number Publication date
US4909165A (en) 1990-03-20
EP0278967A1 (en) 1988-08-24
DE3628829C1 (en) 1988-02-11
JPH01500644A (en) 1989-03-09
WO1988001660A2 (en) 1988-03-10

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