EP1620592B1 - Sewing machine - Google Patents
Sewing machine Download PDFInfo
- Publication number
- EP1620592B1 EP1620592B1 EP04730816A EP04730816A EP1620592B1 EP 1620592 B1 EP1620592 B1 EP 1620592B1 EP 04730816 A EP04730816 A EP 04730816A EP 04730816 A EP04730816 A EP 04730816A EP 1620592 B1 EP1620592 B1 EP 1620592B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piercer
- needle
- sewing machine
- needles
- axis
- 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
Links
- 238000009958 sewing Methods 0.000 title claims abstract description 62
- 239000000463 material Substances 0.000 claims description 19
- 230000001154 acute effect Effects 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 230000032258 transport Effects 0.000 claims 6
- 239000004744 fabric Substances 0.000 description 31
- 238000009941 weaving Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 4
- 206010003402 Arthropod sting Diseases 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05C—EMBROIDERING; TUFTING
- D05C7/00—Special-purpose or automatic embroidering machines
- D05C7/04—Special-purpose or automatic embroidering machines for boring or jogging
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B37/00—Devices incorporated in sewing machines for slitting, grooving, or cutting
- D05B37/02—Slitting or grooving devices
Definitions
- the invention relates to a sewing machine according to the preamble of claim 1 and a engraver for a sewing machine.
- Hemstitch sewing machines and two-needle sewing machines have been known for around a hundred years and still work on the same principle today. This is that by two needles, each associated with a gripper, two parallel juxtaposed zig-zag seam sections are generated. In order to separate the two seams from each other, the weaving threads are slightly pushed apart and a recess or a hole is formed in the sewing material with a leader. To be able to wrap around the spaced-apart woven threads at the edges of the holes with the needles, deep axial grooves are recessed in the engraver laterally. Due to the tension of the weaving threads, when the stitcher is pierced in the sewing material, a free passage for the needles remains in the grooves.
- the latter are pivotably mounted at the lower end of the common needle needle oscillating perpendicular to the needle plate. and pre-piercing bar attached and swinging. That is, a first pass is made with inwardly pivoted needles, so that their tips in the lateral grooves of the engraver led by the created in the free space of the grooves opening in the fabric down to the grippers. During piercing, the needles are so strongly applied to the grooves that they have a bend. The subsequent stitch is then carried out with swung back, that is substantially vertically penetrating into the fabric then not bent needles. In the subsequent stitch, the needles are pivoted back inwards and are bent when penetrating into the fabric and abut the grooves of the engraver. They are also bent by the grippers something aside, so that the hook tip can detect the upper thread loop.
- a device for producing hollow effects on embroidery machines in which a hole in the embroidery material is initially produced with a drill and, after the drill has been withdrawn from the embroidery material at high speed, a needle at an acute angle to the drill axis for stitch formation in the prefabricated Hole is introduced.
- Such a device can only work reliably if the embroidery material has a suitable structure and the hole produced by the drill does not close when the drill is withdrawn.
- the hole cross section can not be maintained constant.
- German patent specification DE-100 814 relates to a stub device, with which the impressions of the hollow embroidery is prevented.
- stubbing is not the edge of the hole, created by a drill hole by a sewing needle, which interacts with a gripper, bordered. Only the hole that has already been enclosed will be widened again. It is a completely different device.
- Object of the present invention is to provide a sewing machine and a engraver, which overcomes the disadvantages of the known and allows the proper production of hollow seams both loosely as well as tightly woven fabric.
- the farther apart grippers allow the use of a piercer and a piercer with much less conicity, ie with much longer tip, so that the weaving threads are pushed apart less quickly during piercing and thereby yarn breaks can be prevented. Since the two needles lying in a V-shape penetrate the piercer within the opening formed in the sewing material by the piercer, it is avoided that individual weaving threads are not looped around by the sewing threads. The always oscillating in the direction of the needle axis needles are not subject to bending forces and therefore a needle breakage can be excluded by material fatigue. In the further are the ears of the Needles perfectly accessible for the insertion of the needle thread.
- the engraver according to the invention can be fastened to a household sewing machine and makes it possible to produce hollow seams even in the private sector.
- FIGS. 1 to 5 For a better understanding of the invention and the differences from the prior art are in the FIGS. 1 to 5 the formation of a hemstitch with a conventional hemstitch sewing machine according US-A 2,093,558 illustrated and explained.
- FIG. 1 is the fabric 1 can be seen in the already two hemstitch openings or holes A have been generated.
- the Vorstecher whose cross-section may be, for example, oval, has penetrated into the fabric 1.
- the engraver C located behind at a distance has also penetrated the sewing material 1.
- In the engraver C are laterally two axially extending grooves 3 can be seen (see in particular FIG. 2 ), in which in FIG. 1 already the two needles 8 and 9 are. Due to the spreading movement of the weaving threads through the penetration of a piercer twice, first of the piercer D and then of the piercer C, the weaving threads are pushed to the side and the needles 8 and 9 can penetrate into the recess A.
- FIG. 2 shows the needles 8 and 9 pivoted outwards, swinging outwards in the sewing language, and pierce outside the recess A directly into the fabric 1 a.
- the two upper threads 6 and 7 devoured with the lower threads, not shown, and when pulling out the needles 8.9 from the fabric 1, the stitches are contracted according to the set thread tension and form along the recess A forming zig -Zack seams.
- FIG. 3 shows the third puncture, in which the two needles 8 and 9 are again guided in the grooves formed by the grooves 3 of the engraver C.
- FIG. 1 ' represents the beginning of the production of a new recess A after the fabric 1 has been transported with the conveyor by one step in the direction of the arrow 5.
- the swinging of the two needles 8 and 9 is in the FIGS. 4 and 5 shown closer.
- the two needles 8 and 9 are pivotally connected to two-armed levers 10 and 11 about pivot axes 12,13.
- the two needles 8 and 9 are attached to the first lever arms 14 and 15; the second lever arms 16 and 17 are connected to drive rods 18 and 19.
- the two two-armed levers 10 and 11 are articulated at the front end of a vertically up and down movable Stecherstange 20.
- the two Needles 8,9 are on the Stecherstange 20 and the two engravers C, D, namely the Vorstecher D and the engraver C, attached.
- the engraver C, D and the two needles 8,9 are consequently moved up and down together with the piercing rod 20 perpendicular to the throat plate 21.
- the oblique needles 8,9 experience a bending towards the engraver ..
- FIG. 4 is the Stecherstange 20 with the needles 8 and 9 and the punches D and C in the highest position in which the fabric 1 can be pushed under the needles 8 and 9 and Stecher D and C, respectively.
- the two needles 8 and 9 are steady, ie their tips are close to each other and they are also (in FIG. 4 not visible) according to FIG. 1 in the lateral grooves 3 of the second engraver C.
- ie inclined needles 8 and 9 these are guided together with the punches D and C of the needle bar 20 through the fabric 1 and the needle plate 21 down.
- the two needles 8 and 9 perform a translational motion, ie their tips penetrate close to each other lying in the fabric and the further down driving (not shown) displace the two needles because of their oblique position the fabric 1 to the outside. Shortly before the Hubumledge the Stecherstange 20, the two upper thread loops of the Gripper tips of the two grippers 24 and 25 detected and engulfed with the lower thread.
- FIG. 17 shows, it can be seen that the needle axes V 1 and V 2 are at a preferably acute angle alpha to the axis of movement Y of the piercing rod 20.
- the engraver rod axis Y is perpendicular to the surface of the throat plate 21.
- the movement drive for the two needles 8.9 takes place in the two needle axes V 1 and V 2 with an independent from the drive of the engraver rod 20 but synchronous drive 22nd
- Each of these slots 27 is traversed by one of the two needles 8.9, after the engraver C has penetrated into the fabric 1 and the recess A formed and the weaving threads of the fabric 1 has gently pushed apart.
- a single recess may be provided for both needles 8,9.
- the engraver C can be formed on this oblique grooves 28 which form the passage for the needles 8.9 within the Stecherqueritess (see. Figures 15/16 ).
- the two V-shaped oscillating needles 8,9 are at an angle of preferably 60 ° to each other.
- This entangled position causes with fully inserted needles 8.9 whose tips with that in the corresponding eye 30th Guided upper threads 6,7 are not as close to each other as in the prior art, but in much greater distance.
- This gripper arrangement makes it possible further to form the engraver C much longer and thereby significantly reduce the taper of its tip 30 and thus make the spreading of the weaving threads during piercing gentler because slower and thus to prevent yarn breakage.
- the vertically encircling grippers 24, 25 allow the bobbins accommodated therein to be exchanged without lifting the material 1 from the throat plate 21. Further, such vertical grippers 24,25 seen in sewing direction 5 can be arranged behind the needles 8,9 and thus sewing technique a better stitch pattern can be obtained.
- the two preferably designed as a rotary gripper gripper 24,25 may be driven synchronously or in opposite directions.
- FIG. 11 is the point of intersection K 1 of the two needles 8,9 on the sewing material 1 on the throat plate 21.
- the tips of the needle meet 8.9 in a lateral distance x to the engraver C on the fabric 1 and penetrate this at an angle alpha. So they form the outer punctures of the formed around the hole A zig-zag seam.
- the needle axes V 1 , V 2 as in FIGS. 10 and 12 2 , the point of intersection K 2 of the needles 8, 9 shifts downward, specifically into the plane of the throat plate 21 or of the sewing material 1, which lies on the throat plate 21 (in FIGS FIGS. 9 and 10 Sewing material 1 not shown).
- the recesses A would not synchronously provided on both sides with zig-zag seams, but each offset by a recess A (see. FIG. 7 ). This also means that a hemstitch seam can be produced with only one needle if only one side of the recesses A formed is to be provided with stitches.
- a twin conveyor 31 instead of a conventional conveyor 23, which performs a translatory movement in the throat plate 21, a twin conveyor 31 according to FIG. 8 , This comprises two easily over the surface 32 of the needle plate 21 projecting or guided over this conveyor belts 33. Between the two conveyor belts 33 which are gradually driven and have a freewheel, are preferably two clamping and transport rollers 34,35. These are synchronously drivable and provided with a freewheel. is located above the one transport roller 34, attached to the presser foot, which has been omitted for the sake of clarity in the drawings, a second roller with which the fabric 1 can be kept clamped.
- the fabric is held not only the side of the needle hole 36, but also in front of and behind this as in an embroidery hoop.
- the fabric can therefore neither during stitch formation, glide uncontrolled during the feed.
- the drive of the two conveyor belts 33 and at least one of the two transport rollers 34,35 is usually carried out at every third puncture, ie after completion of a Hohlsaumausnaturalung A.
- the feed corresponds to the distance of the two axes of the engraver C, D and is about 4mm. Such a large hole spacing can not be produced with the known machines.
- FIGS. 13, 14 and FIG. 18 shows how the inventive production of a hemstitch with a piercer C, in which a passage opening 27 for the at least one needle 8 is present, can also be used on a household sewing machine N2.
- the needle 8 is fixed and pierces vertically into the fabric, the at least one engraver C is arranged at an acute angle to the needle axis V 1 . Since in a household sewing machine no drive device for a engraver C is provided and also in the area laterally the needle bar is not enough space for such a drive is present invention the engraver drive housed in a separate, attachable to the sewing machine N2 housing 51.
- the housing 51 is suitably releasably attached to the lower, rear or front side of the upper arm 53 of the sewing machine.
- a drive element such as a linear motor, a crank mechanism or the like, arranged with which the engraver C at an acute angle to the axis V 1 of the needle 8 in the fabric pierceable and retractable.
- three pinholes are made per puncture of the engraver C. This means that the engraver only needs to penetrate the needle into the material at every second puncture of the needle 8 and then has to be pulled out of it again.
- a controller can be accommodated in addition to the linear drive, which, connected to the sewing machine via a cable not visible in the figures or a plug controls the movement of the engraver C.
- a somewhat larger recess 18 must be provided in a needle sewing machine in the throat plate so that the engraver C can penetrate the needle plate 21 before piercing the needle.
- FIG. 13 the engraver C has already penetrated the throat plate 21 and also the needle 8 is driven vertically from above through the recess 27 in the engraver.
- FIG. 14 shows the engraver C and the needle 8 in optimally retracted position, for example, before the fabric is pushed under the needle 8 and the engraver C or when the fabric is advanced by the feed dog.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
- Inorganic Insulating Materials (AREA)
- Massaging Devices (AREA)
Abstract
Description
Gegenstand der Erfindung ist eine Nähmaschine gemäss Oberbegriff des Patentanspruchs 1 sowie ein Stecher für eine Nähmaschine.The invention relates to a sewing machine according to the preamble of claim 1 and a engraver for a sewing machine.
Hohlsaum-Nähmaschinen und Zweinadel-Nähmaschinen sind seit ca. hundert Jahren bekannt und arbeiten auch heute noch nach demselben Prinzip. Dieses besteht darin, dass durch zwei Nadeln, denen je ein Greifer zugeordnet ist, zwei parallel nebeneinander liegende Zick-Zack-Nahtabschnitte erzeugt werden. Um die beiden Nähte voneinander zu trennen, werden mit einem Vorstecher die Webfäden etwas auseinander geschoben und eine Ausnehmung oder ein Loch im Nähgut gebildet. Um die auseinander gedrängten Webfäden an den Rändern der Löchern mit den Nadeln umschlingen zu können, sind im Stecher seitlich tiefe axial verlaufende Nuten eingelassen. Durch die Spannung der Webfäden bleibt bei ins Nähgut eingestochenem Stecher in den Nuten ein freier Durchgang für die Nadeln. Um die Nadeln durch diese beiden einander gegenüberliegenden Durchgänge führen zu können, sind letztere schwenkbar am unteren Ende der lotrecht zur Stichplatte oszillierenden gemeinsamen Nadel- und Vorstecherstange befestigt und werden schwingend betätigt. D.h. ein erster Stich erfolgt mit nach innen geschwenkten Nadeln, so dass deren Spitzen in den seitlichen Nuten des Stechers geführt durch die im Freiraum der Nuten geschaffene Öffnung im Nähgut nach unten zu den Greifern gelangen. Während des Einstechens werden die Nadeln derart stark an die Nuten angelegt, dass sie eine Biegung aufweisen. Der nachfolgende Stich erfolgt dann mit zurückgeschwenkten, d.h. im wesentlichen vertikal in das Nähgut eindringenden dann nicht verbogenen Nadeln. Beim darauffolgenden Stich sind die Nadeln wieder nach innen geschwenkt und werden beim Eindringen in das Nähgut gebogen und liegen an den Nuten des Stechers an. Sie werden zudem auch noch von den Greifern etwas zur Seite gebogen, damit die Greiferspitze die Oberfadenschlaufe erfassen kann.Hemstitch sewing machines and two-needle sewing machines have been known for around a hundred years and still work on the same principle today. This is that by two needles, each associated with a gripper, two parallel juxtaposed zig-zag seam sections are generated. In order to separate the two seams from each other, the weaving threads are slightly pushed apart and a recess or a hole is formed in the sewing material with a leader. To be able to wrap around the spaced-apart woven threads at the edges of the holes with the needles, deep axial grooves are recessed in the engraver laterally. Due to the tension of the weaving threads, when the stitcher is pierced in the sewing material, a free passage for the needles remains in the grooves. In order to be able to guide the needles through these two opposing passages, the latter are pivotably mounted at the lower end of the common needle needle oscillating perpendicular to the needle plate. and pre-piercing bar attached and swinging. That is, a first pass is made with inwardly pivoted needles, so that their tips in the lateral grooves of the engraver led by the created in the free space of the grooves opening in the fabric down to the grippers. During piercing, the needles are so strongly applied to the grooves that they have a bend. The subsequent stitch is then carried out with swung back, that is substantially vertically penetrating into the fabric then not bent needles. In the subsequent stitch, the needles are pivoted back inwards and are bent when penetrating into the fabric and abut the grooves of the engraver. They are also bent by the grippers something aside, so that the hook tip can detect the upper thread loop.
Dieses seit einem Jahrhundert unverändert angewendete Verfahren hat den Nachteil, dass bei jedem zweiten Stich seitliche Kräfte auf die Nadel wirken und diese verbiegen. Im weiteren ist nicht sichergestellt, dass der innenliegende Stich, d.h. der Stich, bei dem die Nadeln verbogen in den Nuten des Stechers geführt werden, alle Webfäden nach aussen drücken. Oft liegen noch einzelne Webfäden innerhalb der Ausnehmung, welche das optische Bild des Hohlsaums verschlechtern, weil sie das gebildete Loch durchqueren. Ein weiterer Nachteil besteht darin, dass die Spitzen der Nadeln bei vollständigem Eingriff in das Nähgut sehr nahe beieinander liegen und folglich auch die Greiferspitzen der beiden Greifer unter der Stichplatte sehr nahe beieinander liegen müssen. Bedingt durch das nahe Beieinanderliegen der beiden Greifer kann der Stecher nicht sehr tief in das Nähgut eindringen bzw. dessen Spitze muss einen grossen Konizitätswinkel aufweisen, um genügend grosse Löcher auszubilden. Dies hat zur Folge, dass beim Spreizen der Webfäden durch das schnelle Eindringen "stumpfen" Spitze des Stechers die Webfäden reissen können. Eine solche Hohlsaum-Nähmaschine ist in der
Bei der aus dem Internationalen Recherchenbericht weiter bekannten
Die weiter genannte deutsche Patentschrift
Aufgabe der vorliegenden Erfindung ist die Schaffung einer Nähmaschine und eines Stechers, welche die Nachteile der bekannten behebt und die einwandfreie Erzeugung von Hohlsäumen sowohl an locker als auch an dicht gewebtem Nähgut ermöglicht.Object of the present invention is to provide a sewing machine and a engraver, which overcomes the disadvantages of the known and allows the proper production of hollow seams both loosely as well as tightly woven fabric.
Gelöst wird diese Aufgabe durch eine Nähmaschine mit den Merkmalen des Patentanspruchs 1 und einen Stecher für eine Nähmaschine gemäss Anspruch 10.
Vorteilhafte Ausgestaltungen der Nähmaschine sind in den abhängigen Ansprüchen definiert.This object is achieved by a sewing machine having the features of patent claim 1 and a engraver for a sewing machine according to
Advantageous embodiments of the sewing machine are defined in the dependent claims.
Es gelingt, mit der erfindungsgemässen Nähmaschine Hohlsäume mit grösseren Löchern und grösserem Abstand der Löcher zu erzeugen. Im weiteren findet keine Verbiegung der Nadeln statt, da diese beim Einstechen weder zur Seite gedrückt werden noch eine translatorische Bewegung durchführen, sondern immer exakt in der Nadelachse oszillieren. Durch die in einem spitzen Winkel zur Stecherachse oszillierenden Nadeln liegen die Nadelspitzen beim vollständigen Eindringen in das Nähgut um ein Mehrfaches weiter voneinander entfernt als bisher und es können die beiden Greifer in grösserer gegenseitiger Distanz und zudem exakt an der nähtechnisch optimalen Stelle angeordnet werden. Es können Greifer mit horizontal liegender Drehachse eingesetzt werden, so dass das Wechseln der Unterfadenspulen ohne Abheben des Nähguts von der Stichplatte möglich ist. Die weiter auseinander liegenden Greifer ermöglichen die Verwendung eines Stechers und eines Vorstechers mit wesentlich geringerer Konizität, d.h. mit wesentlich längerer Spitze, so dass die Webfäden beim Einstechen weniger schnell auseinander geschoben werden und dadurch Fadenbrüche verhindert werden können. Da die beiden in V-Form zueinander liegenden Nadeln den Stecher innerhalb der vom Stecher gebildeten öffnung im Nähgut durchdringen, wird vermieden, dass sich einzelne Webfäden von den Nähfäden nicht umschlungen werden. Die stets in Richtung der Nadelachse oszillierenden Nadeln sind keinen Biegekräften unterworfen und daher kann ein Nadelbruch durch Materialermüdung ausgeschlossen werden. Im weiteren liegen die öhre der Nadeln bestens zugänglich für das Einführen des Nadelfadens.It succeeds with the inventive sewing machine hollow seams with larger holes and greater distance of To create holes. Furthermore, there is no bending of the needles, since they are neither pressed to the side during piercing nor carry out a translatory movement, but always oscillate exactly in the needle axis. Due to the oscillating in an acute angle to the engraver needles needle tips are the full penetration of the fabric by a multiple further apart than before and it can be the two grippers in greater mutual distance and also exactly at the sewing technically optimal location. It can be used with horizontal horizontal axis of rotation gripper, so that the changing of the lower thread bobbins without lifting the material from the stitch plate is possible. The farther apart grippers allow the use of a piercer and a piercer with much less conicity, ie with much longer tip, so that the weaving threads are pushed apart less quickly during piercing and thereby yarn breaks can be prevented. Since the two needles lying in a V-shape penetrate the piercer within the opening formed in the sewing material by the piercer, it is avoided that individual weaving threads are not looped around by the sewing threads. The always oscillating in the direction of the needle axis needles are not subject to bending forces and therefore a needle breakage can be excluded by material fatigue. In the further are the ears of the Needles perfectly accessible for the insertion of the needle thread.
Der erfindungsgemässe Stecher kann an einer Haushaltnähmaschine befestigt werden und ermöglicht es, auch im privaten Bereich Hohlsäume herzustellen.The engraver according to the invention can be fastened to a household sewing machine and makes it possible to produce hollow seams even in the private sector.
Anhand eines illustrierten Ausführungsbeispiels wird die Erfindung näher erläutert. Es zeigen
- Figur 1
- eine Aufsicht auf ein Nähgut und Horizontalschnitt durch die beiden Nadeln, geführt in den Nuten des Stechers (Nähgut angedeutet),
Figur 2- einen Horizontalschnitt über dem Nähgut in
Figur 1 , Nadel nach aussen geschwungen, Figur 3- ein Horizontalschnitt über dem Nähgut beim dritten Stich (Nadeln in Nuten des Stechers verlaufend
Figur 1' , wieFigur 1 Beginn des folgenden Hohlsaumloches), Figur 4- einen Vertikalschnitt durch eine Hohlsaum-Nähmaschine nach dem Stand der Technik im Bereich der Nadeln und Greifer mit eingeschwenkten Nadeln,
- Figur 5
- einen Vertikalschnitt durch eine Hohlsaum-Nähmaschine nach dem Stand der Technik im Bereich der Nadeln und Greifer mit ausgeschwenkten Nadeln,
- Figur 6
- eine Seitenansicht von Vorstecher und einem Stecher mit zwei vertikalen Schlitzen,
- Figur 7
- eine Seitenansicht der beiden Stecher in einer weiteren Ausgestaltung der Erfindung,
Figur 8- eine Aufsicht auf die Stichplatte mit den Transporteurriemchen,
Figur 9- einen Vertikalschnitt durch die erfindungsgemässe Hohlsaum-Nähmaschine im Bereich der Nadeln und Greifer (Einstichstelle aussen) und
Figur 10- einen Vertikalschnitt durch die erfindungsgemässe Hohlsaum-Nähmaschine im Bereich der Nadeln und Greifer (Einstichstelle innen),
Figur 11- eine vergrösserte Darstellung der Nadeln und der Ausnehmung im Stecher gemäss
und Stichstelle,Figur 9 Figur 12- eine vergrösserte Darstellung der Nadeln und der Ausnehmung im Stecher gemäss
und Stichstelle im Stichbild,Figur 10 Figur 13- einen Vertikalschnitt durch die vertikal liegende Nadel einer Haushalt-Nähmaschine und einem zur Nadel in spitzem Winkel liegenden Stecher bei eingestochener Nadel,
Figur 14- einen Vertikalschnitt durch die vertikal liegende Nadel einer Haushalt-Nähmaschine und einem zur Nadel in spitzem Winkel liegenden Stecher bei angehobener Nadel,
Figur 15- eine Ansicht eines Stechers mit seitlich liegenden Nuten,
- Figur 16
- eine Seitenansicht des Stechers gemäss
Figur 15 mit abgesenkter Nadel (in der Nut liegend), Figur 17- eine schematische Seitenansicht einer erfindungsgemässen Hohlsaum-Nähmaschine,
Figur 18- eine schematische Seitenansicht einer Haushalt-Nähmaschine mit einem erfindungsgemässen Stecher.
- FIG. 1
- a view of a fabric and horizontal section through the two needles, guided in the grooves of the engraver (sewing material indicated),
- FIG. 2
- a horizontal section above the fabric in
FIG. 1 , Needle swung outwards, - FIG. 3
- a horizontal section above the fabric at the third stitch (needles in grooves of the engraver running
FIG. 1 ' , asFIG. 1 Beginning of the following hemstitch hole), - FIG. 4
- a vertical section through a hemstitch sewing machine according to the prior art in the field of needles and grippers with pivoted needles,
- FIG. 5
- a vertical section through a hemstitch sewing machine according to the prior art in the field of needles and grippers with pivoted needles,
- FIG. 6
- a side view of Vorstecher and a engraver with two vertical slots,
- FIG. 7
- a side view of the two engravers in a further embodiment of the invention,
- FIG. 8
- a view of the throat plate with the transport straps,
- FIG. 9
- a vertical section through the inventive hemstitch sewing machine in the field of needles and grippers (puncture site outside) and
- FIG. 10
- a vertical section through the inventive hemstitch sewing machine in the field of needles and grippers (puncture site inside),
- FIG. 11
- an enlarged view of the needles and the recess in the engraver according to
FIG. 9 and sting site, - FIG. 12
- an enlarged view of the needles and the recess in the engraver according to
FIG. 10 and stitching point in the stitch image, - FIG. 13
- a vertical section through the vertical needle of a household sewing machine and a needle lying at an acute angle engraver with pierced needle,
- FIG. 14
- a vertical section through the vertical needle of a household sewing machine and a needle lying at an acute angle Engraver with raised needle,
- FIG. 15
- a view of a engraver with lateral grooves,
- FIG. 16
- a side view of the engraver according
FIG. 15 with lowered needle (lying in the groove), - FIG. 17
- a schematic side view of an inventive hemstitch sewing machine,
- FIG. 18
- a schematic side view of a household sewing machine with an inventive engraver.
Zum besseren Verständnis der Erfindung und der Unterschiede zum Stand der Technik werden in den
In
Das Schwingen der beiden Nadeln 8 und 9 wird in den
Unterhalb der Stichplatte 21 sind der Transporteur 23 und die beiden Greifer 24,25 sichtbar.Below the
In
Beim Einstich gemäss
In der schematischen Darstellungen gemäss
Beim Einstechen der Nadeln 8,9 findet keine translatorische Bewegung statt. Die Lage des Durchstichs durch das Nähgut 1 bzw. die Nähgutebene in den Löchern wird nicht verändert und es wirken während des Einstechens keine seitlichen Kräfte auf die Nadeln 8,9 und die Webfäden des Nähguts 1. Um diese sich kreuzenden Vorschubwege der Nadeln 8,9 zu ermöglichen, liegen die beiden Nadelachsen V1 und V2 in Nährichtung 5 um mindestens einen Nadeldurchmesser versetzt, d.h. die Nadeln 8,9 kreuzen sich (vgl.
In
Alternativ zu dem in
Alternatively to the in
Die Verschiebung des Kreuzungspunktes K der Nadeln 8,9 nach unten kann, wie bereits erwähnt, durch Änderung der beiden Winkel alpha zur lotrechten Achse Y oder durch eine Parallelverschiebung der Nadelachsen V1 bzw. V2 nach aussen erfolgen. Die Antriebsrichtung der Nadeln 8,9 in Achsrichtung V1 bzw. V2 bleibt aber stets erhalten. D.h. es erfolgt keine translatorische Bewegung der Nadeln 8,9 wie bei den bisherigen Verfahren gemäss
In einer bevorzugten Ausführung der Erfindung tritt anstelle eines herkömmlichen Transporteurs 23, der eine translatorische Bewegung in der Stichplatte 21 durchführt, ein Doppeltransporteur 31 gemäss
In den
In
In
Claims (9)
- A sewing machine with at least one needle (8) for creating a hemstitch in a material to be sewn (1), as well as with a transporter (31) for the transport of the material to be sewn, wherein the axis (V1) of the at least one needle (8) runs at an acute angle (α) to the axis (Y) of a piercer (C), and the needle (8) may be driven by a needle rod drive in the direction of the axis (V1) and the piercer (C) by a piercer bar drive in the direction of the axis (Y) of the piercer (C), characterised in that the at least one piercer (C), seen in the sewing direction (5), is arranged laterally of the needle, and comprises a slot (27) extending in the piercer (C) or at least one groove (28) incorporated peripherally on the piercer (C), through which slot or groove the at least one needle (8) may be led within the piercer cross section, on stitch formation with a pierced piercer (C).
- A sewing machine according to claim 1, characterised in that two needles (8, 9) are arranged axially symmetrical to the piercer (C) lying in a V-shape, and cross in the slot (27) in the piercer (C) or in the lateral grooves (28), within the piercer cross section, on stitch formation.
- A sewing machine according to claim 2, characterised in that in each case a slot (27) for one of the two needles (8, 98), or a common slot (27) for both needles (8, 9) or in each case a groove (28) for both needles (8, 9), is formed in the piercer (C).
- A sewing machine according to one of the claims 1 to 3, characterised in that the needle axis (V1, V2) with the at least one needle (8, 9) is pivotally or slidably mounted for changing the stitch insert location.
- A sewing machine according to one of the claims 1 to 4, characterised in that the angle (α) between the axis (V1, V2) of the needle (8, 9) and the axis of the piercer (C) is approx. 30°.
- A sewing machine according to one of the claims 1 to 5, characterised in that the transporter (31) comprises two drivable transport belts (33) which revolve in parallel and whose belt face lying at the top projects beyond the * (21) and/or that at least one drivable transport wheel (34, 35) is arranged, which cooperates with a counter holding wheel on the presser foot on sewing, and in a clamped manner, transports the material to be sewn.
- A sewing machine according to claim 6, characterised in that the transport belts (33) and/or the at least one transport wheel (34, 35) have a freewheel.
- A sewing machine according to one of the claims 2 to 7, characterised in that the two grippers (24, 25) revolve or oscillate on rotation axes arrange parallel to the * (21), and that the rotation axes (28, 29) lie parallel to the sewing direction (5).
- A piercer for a sewing machine according to one of the preceding claims, characterised in that the drive element for the at least one piercer (C) is accommodated in a separate housing which may be fastened on the sewing machine, and is connectable to the control and feed of the sewing machine, and that the piercer axis (Y) lies at an acute angle to the * (21) of the sewing machine, and may be driven in coordination with the needle drive.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH7822003 | 2003-05-05 | ||
PCT/CH2004/000267 WO2004099481A1 (en) | 2003-05-05 | 2004-05-03 | Sewing machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1620592A1 EP1620592A1 (en) | 2006-02-01 |
EP1620592B1 true EP1620592B1 (en) | 2008-07-16 |
Family
ID=33426267
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04730816A Expired - Lifetime EP1620592B1 (en) | 2003-05-05 | 2004-05-03 | Sewing machine |
Country Status (5)
Country | Link |
---|---|
US (1) | US7353761B2 (en) |
EP (1) | EP1620592B1 (en) |
AT (1) | ATE401444T1 (en) |
DE (1) | DE502004007615D1 (en) |
WO (1) | WO2004099481A1 (en) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE109522C (en) * | ||||
DE100814C (en) * | ||||
NL24612C (en) * | 1928-03-12 | |||
DE596947C (en) * | 1931-11-19 | 1934-05-14 | Wuerker G M B H | Decorative stitch device for sewing machines |
US1920784A (en) * | 1932-04-23 | 1933-08-01 | Singer Mfg Co | Hemstitch and embroidery seam |
US2093558A (en) * | 1935-02-07 | 1937-09-21 | Anciens Ets R Cornely & Cie | Hemstitching machine |
US2491457A (en) * | 1945-02-06 | 1949-12-13 | Man Sew Corp | Multiple needle stitching mechanism |
DE7927132U1 (en) * | 1979-09-25 | 1979-12-13 | Maschinenfabrik Carl Zangs Ag, 4150 Krefeld | EMBROIDERY MACHINE WITH SEVERAL SINGLE-NEEDLE EMBROIDERY HEADS |
AT395728B (en) * | 1982-03-29 | 1993-02-25 | August Heinzle | SHIP EMBROIDERY MACHINE |
DE102004012822B3 (en) * | 2004-03-16 | 2005-06-16 | Ksa Gmbh & Co. Kg | Sewing machine needle chain stitch mechanism has thread trap operating in conjunction with powered thread puller |
-
2004
- 2004-05-03 AT AT04730816T patent/ATE401444T1/en not_active IP Right Cessation
- 2004-05-03 DE DE502004007615T patent/DE502004007615D1/en not_active Expired - Lifetime
- 2004-05-03 US US10/554,646 patent/US7353761B2/en not_active Expired - Fee Related
- 2004-05-03 WO PCT/CH2004/000267 patent/WO2004099481A1/en active IP Right Grant
- 2004-05-03 EP EP04730816A patent/EP1620592B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
WO2004099481A1 (en) | 2004-11-18 |
US20060278144A1 (en) | 2006-12-14 |
ATE401444T1 (en) | 2008-08-15 |
DE502004007615D1 (en) | 2008-08-28 |
EP1620592A1 (en) | 2006-02-01 |
US7353761B2 (en) | 2008-04-08 |
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