EP0547331B1 - Latch needle for stichforming textile machines - Google Patents

Latch needle for stichforming textile machines Download PDF

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Publication number
EP0547331B1
EP0547331B1 EP92117899A EP92117899A EP0547331B1 EP 0547331 B1 EP0547331 B1 EP 0547331B1 EP 92117899 A EP92117899 A EP 92117899A EP 92117899 A EP92117899 A EP 92117899A EP 0547331 B1 EP0547331 B1 EP 0547331B1
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EP
European Patent Office
Prior art keywords
latch
needle
tongue
opening
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
Application number
EP92117899A
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German (de)
French (fr)
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EP0547331A2 (en
EP0547331A3 (en
Inventor
Siegmund Sos
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Groz Beckert KG
Original Assignee
Theodor Groz and Soehne and Ernst Beckert Nadelfabrik KG
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Publication of EP0547331A2 publication Critical patent/EP0547331A2/en
Publication of EP0547331A3 publication Critical patent/EP0547331A3/en
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Publication of EP0547331B1 publication Critical patent/EP0547331B1/en
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B35/00—Details of, or auxiliary devices incorporated in, knitting machines, not otherwise provided for
    • D04B35/02—Knitting tools or instruments not provided for in group D04B15/00 or D04B27/00
    • D04B35/04—Latch needles

Definitions

  • the invention relates to a latch needle for stitch-forming textile machines with a needle shaft and a needle tongue which is pivotably mounted in a tongue slot of the needle shaft by means of a guer-extending axis, which at one end carries a tongue spoon which adjoins a tongue shaft and which cooperates with the needle hook in the tongue closed position and whose tongue shaft is formed with a bearing bore and has an end part extending from the region of the bearing bore to the end facing away from the tongue spoon, and with an elongated spring element which is anchored in the region of one end of the needle shaft and with its other free end in the Tongue slit protrudes and, at least when the needle tongue is in the closed position, overlaps an associated support surface on the end part of the tongue shaft, the needle tongue being able to be elastically converted into a partially open intermediate position by the spring element acting on it.
  • a latch needle with these features is known from DE-PS 37 02 019.
  • the partially open intermediate position of the needle tongue allows an unimpeded insertion of the thread into the needle hook when the knitted fabric is cast on for the first time, ie at the beginning of the knitting process or when picking up stitches, as is explained in detail in this patent specification.
  • the needle tongue is pivotally mounted with its bearing bore on the axis, which in turn is formed by a cylindrical pin rotatably inserted into corresponding bores in the needle shaft cheeks laterally delimiting the tongue slot or by essentially cylindrical shapes of the needle shaft cheeks which protrude into the bearing bore.
  • the tongue shaft Since a certain bearing play is required between the axis and the bearing bore with a view to the smooth movement of the needle tongue, the tongue shaft must be guided relatively exactly laterally in the tongue slot.
  • the contact surface also becomes small for the end of the spring element, because it must always be ensured that the bearing bore is surrounded on all sides by a sufficiently strong bearing shell.
  • the exact positioning of the end of the spring element on such a small contact surface of the needle tongue sometimes causes difficulties in mass production, which can lead to the end of the spring element missing the contact surface, which leads to defects in the knitted fabric and the latch needle immediately unusable.
  • the object of the invention is therefore to remedy this situation and to create a latch needle which, even with smaller needle sizes, ensures perfect interaction of the spring element with the latch, without placing excessive demands on the manufacturing accuracy, in particular of the latch slot.
  • the latch needle mentioned at the outset is characterized according to the invention in that the latch shaft has in the region of its end part an open-ended opening extending into the bearing bore, on the edge of which the bearing surface is arranged, and in that the latch shaft with the corresponding holes in the Tongue slot limiting needle shaft cheeks rotatably mounted axis is rigidly connected.
  • the latch and the axis form an inseparable unit, so that a lateral Tilting or deflecting the needle tongue during the pivoting movement to a harmful degree is not possible because the stub shaft of the axle, which is rotatably mounted in the holes in the needle shaft cheeks, can be fitted into the holes in a tolerated manner without great effort. Therefore, the precision of the longitudinal needle slot no longer has to be high, because it no longer needs to guide the tongue shaft laterally. In addition, because of the rigid connection between the needle tongue and the axis, the usual measures for captive securing of the axis in the needle shaft cheeks are eliminated.
  • the bearing surface for the end of the spring element can extend directly to the axis, with the result that even with small needle sizes, a sufficiently large bearing surface for the Spring element is available.
  • the idea of the invention is not limited to small needle sizes; it can be used reliably for all needle sizes.
  • latch needles are known in which the needle tongue is formed with a slot-like opening protruding into its bearing bore.
  • these latch needles are not equipped with a spring element which interacts with the needle latch.
  • the needle tongue is pivotally mounted on an axis connected to the needle shaft in a rotationally fixed manner, in one case the aim being to achieve interchangeability of the needle tongue through the open design of the so-called tongue eye, while in another case, the thin, plastically deformable tongue shaft is bent in the manner of an eyelet around the axis formed integrally on the needle shaft.
  • the opening in the region of the end part of the latch shaft is advantageously designed to widen outwards from the bearing bore, the opening angle of the opening border being approximately 60 ° in a preferred embodiment.
  • the arrangement can expediently be such that the opening is delimited by two legs of the end part of the tongue shaft, of which the leg opposite the back of the tongue shaft bears the bearing surface on its inside, while the leg opposite the bearing surface is shortened in the tongue longitudinal direction. It is advantageous if the shortened leg is rounded at the end.
  • the tongue shaft can be rigidly connected to the axis in any manner appropriate per se. Simple manufacturing relationships result when the tongue shaft on the axis in particular by means of Laser spot welding is welded on.
  • FIG. 1 to 4 show a latch needle according to the invention, illustrating four different latch positions, each in a schematic partial representation, in a side view and partially cut away.
  • the latch needle has a needle shaft 1, which optionally carries a foot (not shown) and to which a needle hook 3 is connected via a needle neck 2.
  • a needle shaft 1 which has a rectangular cross-sectional shape, a tongue slot 4 is formed which extends in the longitudinal direction of the needle shaft and which, starting from the upper side of the needle shaft, extends to the underside of the needle shaft in such a way that an opening 5 is provided on the underside of the needle shaft for lint removal.
  • a needle tongue 6 is pivotally mounted at a bearing point by means of a transverse axis 7.
  • the axis 7 is designed in the form of a cylindrical steel pin which is rotatably mounted in cylindrical bores 8, which are aligned with one another, of the needle shaft cheeks 9 which delimit the tongue slot 4 on both sides, with little bearing play.
  • the needle tongue 6 has a tongue shaft 10, which is provided at the bearing point with a transverse, continuous bearing bore 11 assigned to the axis 7 and at the end carries a tongue spoon 12 which cooperates with the needle hook 3 in the closed position, as shown in FIG. 2 is illustrated.
  • a groove-like depression 13 which extends from the top of the needle shaft and extends in the longitudinal direction of the needle shaft and in which an elongated spring element 14 is anchored at one end, which is anchored at its other end 15, is formed in the needle shaft 1 protrudes into the tongue slot 4.
  • the spring element 14, which is designed as a straight piece of spring wire in the illustrated embodiment, can also be a round, flat or square spring; as shown, it can be straight or curved or appropriately bent.
  • the end of the spring element 14 is firmly clamped at 16 by caulking.
  • the bottom 17 of the recess 13 is gently inclined toward the underside of the needle shaft in such a way that the end 15 of the spring element 14 lying in the tongue slot 4 can be freely moved up and down.
  • the tongue shaft 10 has an extended end part 18 (FIG. 3) in the area between the bearing bore 11 and the end face remote from the spoon 12, such that the needle tongue 6 forms a double-armed lever which is pivotably mounted by means of the axis 7.
  • an opening 20 opening from the end face at 19 is formed, which extends into the bearing bore 11, in such a way that the bearing shell surrounding the axis 7 on the side of the needle tongue 6 facing away from the tongue spoon 12 is removed in the region of the opening 20 is.
  • the bearing bore 11 is opened through the opening 20 over a circumferential area of approximately 120 °, as indicated at 21 in FIG. 3.
  • the opening 20 itself, starting from the bearing bore 11, is designed to widen in the shape of a wedge, the opening angle of the opening boundary indicated at 22 being approximately 60 °. It allows two legs 23, 24 to emerge in the end part 18 of the needle tongue 6, which open the opening limit and of which the leg 23 opposite the back 25 of the tongue shaft 10 carries on its inner side which forms part of the opening boundary a bearing surface 26 for the end 15 of the spring element 14.
  • the bearing surface 26 is aligned substantially flat and parallel to the front 27 of the tongue shaft 10.
  • the leg 24 opposite the support surface 26 is shortened in the tongue longitudinal direction; it is rounded at the end at 28, so that its inner surface forming part of the edge of the opening 22 is subsequently formed over a rounded region at 28 on the back 25 of the tongue shaft 10.
  • the needle tongue 6 is rigidly connected to the axis 7.
  • the tongue shaft 10 is welded to the axis 7 by means of laser spot welding.
  • the welding points are indicated at 29 in FIG. 4.
  • the assembly is carried out in such a way that after inserting the cylindrical axis 7 into the bores 8 of the needle shaft cheeks 9, the needle tongue 6 is pushed onto the axis 7 from above in a position in which its longitudinal axis is at an angle of approximately 90 with the longitudinal axis of the needle shaft ° includes, whereupon the weld at 29 is carried out from below through the opening 5 by means of a laser.
  • the needle tongue 6 thus forms an inseparable unit with the welded axis 7, which is captive via the bores 8 and the axis 7 in the tongue slot 4 and can be pivoted about the axis 7 is stored.
  • the bearing play between the cylindrical axis 7 and the cylindrical bores 8 is dimensioned appropriately, so that on the one hand easy mobility of the needle tongue 6 is ensured and on the other hand lateral tilting or deflection of the needle tongue 6 during the pivoting movement are avoided.
  • the length of the spring element 14 is selected such that it overlaps the contact surface 26 of the tongue end part 18 when the needle tongue 6 is in the closed position (FIG. 2), with the spring element 14 at the same time In the closed position of the needle tongue 6, compared to the relaxed state shown in FIG. 1, its end 15 is raised upwards somewhat and is thus prestressed.
  • the needle tongue 6 If, starting from this closed position, the needle tongue 6 is released, it can be transferred from the prestressed spring element 14 to the partially open intermediate position shown in FIG. 1, in which the longitudinal central axes of the needle tongue 6 and the needle shaft 1 form an angle of approximately 30 ° include with each other as indicated at 30.
  • the size of this angle depends on the respective needle construction; in any case, it is less than 90 °.
  • the support surface 26 extends from the end face 19 to the axis 7 directly because of the opening 20, it is sufficiently long, even with small needle sizes, for a secure engagement to ensure the end 15 of the spring element 14.
  • the needle tongue 6 is pivoted clockwise from the stitch hanging in the needle hook 3, starting from the intermediate position according to FIG. 1, in the direction of the fully open position according to FIG. 4, the support surface 26 rises from it End 15 of the spring element 14. Since the opening 20, starting from the bearing bore 11, widens towards the outside towards the funnel-shaped end face 19, and since the second leg 24, rounded at the end at 28 and opposite the support surface 26, is correspondingly short, the needle tongue 6 can be completely free Execute from the intermediate position (Fig. 1) pivotal movement towards the fully open position shown in FIG. 4, without being affected by the spring element 14.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)

Description

Die Erfindung betrifft eine Zungennadel für maschenbildende Textilmaschinen mit einem Nadelschaft und einer in einem Zungenschlitz des Nadelschaftes mittels einer guerverlaufenden Achse schwenkbar gelagerten Nadelzunge, die einenends einen an einen Zungenschaft anschließenden, in der Zungenschließstellung mit dem Nadelhaken zusammenwirkenden Zungenlöffel trägt und deren Zungenschaft mit einer Lagerbohrung ausgebildet ist und ein von dem Bereich der Lagerbohrung bis zu dem von dem Zungenlöffel abgewandten Ende sich erstreckendes Endteil aufweist, sowie mit einem länglichen Federelement, das im Bereiche seines einen Endes an dem Nadelschaft verankert ist und mit seinem anderen freien Ende in den Zungenschlitz ragt und zumindest bei in der Schließstellung stehender Nadelzunge eine zugeordnete Auflagefläche an dem Endteil des Zungenschaftes übergreift, wobei die Nadelzunge durch das an ihr angreifende Federelement elastisch in eine teilweise geöffnete Zwischenstellung überführbar ist.The invention relates to a latch needle for stitch-forming textile machines with a needle shaft and a needle tongue which is pivotably mounted in a tongue slot of the needle shaft by means of a guer-extending axis, which at one end carries a tongue spoon which adjoins a tongue shaft and which cooperates with the needle hook in the tongue closed position and whose tongue shaft is formed with a bearing bore and has an end part extending from the region of the bearing bore to the end facing away from the tongue spoon, and with an elongated spring element which is anchored in the region of one end of the needle shaft and with its other free end in the Tongue slit protrudes and, at least when the needle tongue is in the closed position, overlaps an associated support surface on the end part of the tongue shaft, the needle tongue being able to be elastically converted into a partially open intermediate position by the spring element acting on it.

Eine Zungennadel mit diesen Merkmalen ist aus der DE-PS 37 02 019 bekannt. Die teilweise geöffnete Zwischenstellung der Nadelzunge gestattet beim erstmaligen Anschlagen des Gestrickes, d.h. bei Beginn des Strickvorganges oder beim Aufnehmen von Maschen ein unbehindertes Einlegen des Fadens in den Nadelhaken, wie dies in dieser Patentschrift im einzelnen erläutert ist. Die Nadelzunge ist dabei mit ihrer Lagerbohrung auf der Achse schwenkbar gelagert, die ihrerseits durch einen in entsprechende Bohrungen in den den Zungenschlitz seitlich begrenzenden Nadelschaftwangen drehfest eingesetzten zylindrischen Stift oder von im wesentlichen zylindrischen Ausprägungen der Nadelschaftwangen gebildet ist, die in die Lagerbohrung ragen. Um eine einwandfreie Funktion der Nadelzunge zu gewährleisten, muß sichergestellt sein, daß das Ende des Federelementes sicher mit der Auflagefläche an dem Endteil der Nadelzunge zusammenwirkt. Da mit Rücksicht auf die Leichtgängigkeit der Nadelzunge zwischen der Achse und der Lagerbohrung ein gewisses Lagerspiel erforderlich ist, muß der Zungenschaft in dem Zungenschlitz verhältnismäßig genau seitlich geführt werden. Bei kleineren Nadelgrößen, die auch eine entsprechend kleinere Nadelzunge aufweisen, wird aber auch die Auflagefläche für das Ende des Federelementes klein, weil auf jeden Fall sichergestellt bleiben muß, daß die Lagerbohrung durch eine ausreichend starke Lagerschale allseitig umgeben ist. Die exakte Positionierung des Endes des Federelementes auf einer solcherart kleinen Auflagefläche der Nadelzunge bereitet in der Praxis bei der Massenfertigung gelegentlich Schwierigkeiten, die dazu führen können, daß das Federelement mit seinem Ende die Auflagefläche verfehlt, was zu Fehlern in der Maschenware führt und die Zungennadel sofort unbrauchbar macht.A latch needle with these features is known from DE-PS 37 02 019. The partially open intermediate position of the needle tongue allows an unimpeded insertion of the thread into the needle hook when the knitted fabric is cast on for the first time, ie at the beginning of the knitting process or when picking up stitches, as is explained in detail in this patent specification. The needle tongue is pivotally mounted with its bearing bore on the axis, which in turn is formed by a cylindrical pin rotatably inserted into corresponding bores in the needle shaft cheeks laterally delimiting the tongue slot or by essentially cylindrical shapes of the needle shaft cheeks which protrude into the bearing bore. In order to ensure proper functioning of the needle tongue, it must be ensured that the end of the spring element interacts securely with the bearing surface on the end part of the needle tongue. Since a certain bearing play is required between the axis and the bearing bore with a view to the smooth movement of the needle tongue, the tongue shaft must be guided relatively exactly laterally in the tongue slot. In the case of smaller needle sizes, which also have a correspondingly smaller needle tongue, the contact surface also becomes small for the end of the spring element, because it must always be ensured that the bearing bore is surrounded on all sides by a sufficiently strong bearing shell. The exact positioning of the end of the spring element on such a small contact surface of the needle tongue sometimes causes difficulties in mass production, which can lead to the end of the spring element missing the contact surface, which leads to defects in the knitted fabric and the latch needle immediately unusable.

Aufgabe der Erfindung ist es deshalb, hier abzuhelfen und eine Zungennadel zu schaffen, die auch bei kleineren Nadelgrößen ein einwandfreies Zusammenwirken des Federelementes mit der Nadelzunge gewährleistet, ohne dazu übermäßig große Anforderungen an die Herstellungsgenauigkeit insbesondere des Zungenschlitzes zu stellen.The object of the invention is therefore to remedy this situation and to create a latch needle which, even with smaller needle sizes, ensures perfect interaction of the spring element with the latch, without placing excessive demands on the manufacturing accuracy, in particular of the latch slot.

Zur Lösung dieser Aufgabe ist die eingangs genannte Zungennadel erfindungsgemäß dadurch gekennzeichnet, daß der Zungenschaft im Bereiche seines Endteiles eine bis in die Lagerbohrung reichende randoffene öffnung aufweist, auf deren Berandung die Auflagefläche angeordnet ist, und daß der Zungenschaft mit der in entsprechenden Bohrungen in den den Zungenschlitz begrenzenden Nadelschaftwangen drehbar gelagerten Achse starr verbunden ist.To achieve this object, the latch needle mentioned at the outset is characterized according to the invention in that the latch shaft has in the region of its end part an open-ended opening extending into the bearing bore, on the edge of which the bearing surface is arranged, and in that the latch shaft with the corresponding holes in the Tongue slot limiting needle shaft cheeks rotatably mounted axis is rigidly connected.

Bei dieser Zungennadel bilden die Nadelzunge und die Achse eine unlösbare Einheit, so daß ein seitliches Kippen oder Auslenken der Nadelzunge während der Schwenkbewegung in einem schädlichen Maße nicht möglich ist, weil die in den Bohrungen der Nadelschaftwangen drehbar gelagerten Stummel der Achse ohne großen Aufwand eng toleriert in die Bohrungen eingepaßt werden können. An die Präzision des Nadellängsschlitzes brauchen deshalb keine hohen Anforderungen mehr gestellt zu werden, weil dieser den Zungenschaft nicht mehr seitlich zu führen braucht. Außerdem entfallen wegen der starren Verbindung zwischen der Nadelzunge und der Achse die sonst üblichen Maßnahmen zur unverlierbaren Sicherung der Achse in den Nadelschaftwangen. Dadurch, daß durch die in dem Endteil des Zungenschaftes vorgesehene Öffnung die Lagerschale teilweise weggenommen ist, kann die Auflagefläche für das Ende des Federelementes sich unmittelbar bis zu der Achse erstrecken, mit der Folge, daß auch bei kleinen Nadelgrößen noch eine ausreichend große Auflagefläche für das Federelement zur Verfügung steht. Der erfindungsgemäße Gedanke ist aber nicht auf kleine Nadelgrößen beschränkt; er läßt sich bei allen Nadelgrößen funktionssicher anwenden.In this latch needle, the latch and the axis form an inseparable unit, so that a lateral Tilting or deflecting the needle tongue during the pivoting movement to a harmful degree is not possible because the stub shaft of the axle, which is rotatably mounted in the holes in the needle shaft cheeks, can be fitted into the holes in a tolerated manner without great effort. Therefore, the precision of the longitudinal needle slot no longer has to be high, because it no longer needs to guide the tongue shaft laterally. In addition, because of the rigid connection between the needle tongue and the axis, the usual measures for captive securing of the axis in the needle shaft cheeks are eliminated. Characterized in that the bearing shell is partially removed through the opening provided in the end part of the tongue shaft, the bearing surface for the end of the spring element can extend directly to the axis, with the result that even with small needle sizes, a sufficiently large bearing surface for the Spring element is available. The idea of the invention is not limited to small needle sizes; it can be used reliably for all needle sizes.

Beispielsweise aus der DE-PS 413 459 und der US-PS 219 012 sind Zungennadeln bekannt, bei denen die Nadelzunge mit einer in deren Lagerbohrung ragenden schlitzartigen Öffnung ausgebildet ist. Diese Zungennadeln sind aber nicht mit einem mit der Nadelzunge zusammenwirkenden Federelement ausgestattet. Die Nadelzunge ist auf einer mit dem Nadelschaft drehfest verbundenen Achse schwenkbar gelagert, wobei es im einen Fall darum geht, durch die offene Ausbildung des sogenannten Zungenöhrs eine Auswechselbarkeit der Nadelzunge zu erreichen, während im anderen Fall der dünne, plastisch verformbare Zungenschaft nach Art einer Öse um die einstückig an dem Nadelschaft angeformte Achse herumgebogen ist.For example from DE-PS 413 459 and US-PS 219 012 latch needles are known in which the needle tongue is formed with a slot-like opening protruding into its bearing bore. However, these latch needles are not equipped with a spring element which interacts with the needle latch. The needle tongue is pivotally mounted on an axis connected to the needle shaft in a rotationally fixed manner, in one case the aim being to achieve interchangeability of the needle tongue through the open design of the so-called tongue eye, while in another case, the thin, plastically deformable tongue shaft is bent in the manner of an eyelet around the axis formed integrally on the needle shaft.

Bei der neuen Zungennadel ist die öffnung im Bereiche des Endteils des Zungenschaftes von der Lagerbohrung ausgehend mit Vorteil nach außen zu sich erweiternd ausgebildet, wobei der Öffnungswinkel der öffnungsberandung in einer bevorzugten Ausführungsform ca.60° beträgt. Auf diese Weise ergeben sich sehr günstige Eingriffsverhältnisse zwischen dem Ende des Federelementes und dem Endteil der Nadelzunge, die sicherstellen, daß die Nadelzunge bei ihrer Schwenkbewegung von der Zwischenstellung aus in Richtung auf deren völlig geöffnete Stellung hin über einen großen Schwenkbereich von dem Federelement völlig abgekoppelt ist.With the new latch needle, the opening in the region of the end part of the latch shaft is advantageously designed to widen outwards from the bearing bore, the opening angle of the opening border being approximately 60 ° in a preferred embodiment. In this way, there are very favorable engagement conditions between the end of the spring element and the end part of the needle tongue, which ensure that the needle tongue is completely decoupled from the spring element during its pivoting movement from the intermediate position towards its fully open position over a large pivoting range .

Die Anordnung kann zweckmäßigerweise derart getroffen sein, daß die Öffnung durch zwei Schenkel des Endteiles des Zungenschaftes begrenzt ist, von denen der dem Rücken des Zungenschaftes gegenüberliegende Schenkel auf seiner Innenseite die Auflagefläche trägt, während der der Auflagefläche gegenüberliegende Schenkel in Zungenlängsrichtung verkürzt ist. Dabei ist es von Vorteil, wenn der verkürzte Schenkel endseitig abgerundet ist.The arrangement can expediently be such that the opening is delimited by two legs of the end part of the tongue shaft, of which the leg opposite the back of the tongue shaft bears the bearing surface on its inside, while the leg opposite the bearing surface is shortened in the tongue longitudinal direction. It is advantageous if the shortened leg is rounded at the end.

Der Zungenschaft kann mit der Achse in an sich beliebiger zweckentsprechender Weise starr verbunden sein. Einfache Herstellungsverhältnisse ergeben sich, wenn der Zungenschaft an der Achse insbesondere mittels Laser-Punktschweißen angeschweißt ist.The tongue shaft can be rigidly connected to the axis in any manner appropriate per se. Simple manufacturing relationships result when the tongue shaft on the axis in particular by means of Laser spot welding is welded on.

In der Zeichnung ist ein Ausführungsbeispiel des Gegenstandes der Erfindung dargestellt. Die Fig.1 bis 4 zeigen eine Zungennadel gemäß der Erfindung, unter Veranschaulichung von vier verschiedenen Zungenstellungen, jeweils in schematischer Teildarstellung, in einer Seitenansicht und teilweise aufgeschnitten.In the drawing, an embodiment of the object of the invention is shown. 1 to 4 show a latch needle according to the invention, illustrating four different latch positions, each in a schematic partial representation, in a side view and partially cut away.

Die Zungennadel weist einen Nadelschaft 1 auf, der gegebenenfalls einen (nicht dargestellten) Fuß trägt und an den sich über einen Nadelhals 2 ein Nadelhaken 3 anschließt. In dem eine rechteckige Querschnittsgestalt aufweisenden Nadelschaft 1 ist ein sich in Nadelschaftlängsrichtung erstreckender Zungenschlitz 4 ausgebildet, der sich, ausgehend von der Nadelschaftoberseite zu der Nadelschaftunterseite erstreckt, derart, daß auf der Nadelschaftunterseite ein der Flusenabfuhr dienender Durchbruch 5 vorhanden ist.The latch needle has a needle shaft 1, which optionally carries a foot (not shown) and to which a needle hook 3 is connected via a needle neck 2. In the needle shaft 1, which has a rectangular cross-sectional shape, a tongue slot 4 is formed which extends in the longitudinal direction of the needle shaft and which, starting from the upper side of the needle shaft, extends to the underside of the needle shaft in such a way that an opening 5 is provided on the underside of the needle shaft for lint removal.

In dem Zungenschlitz 4 ist eine Nadelzunge 6 mittels einer querverlaufenden Achse 7 an einer Lagerstelle schwenkbar gelagert. Die Achse 7 ist in Gestalt eines zylindrischen Stahlstiftes ausgebildet, der in miteinander fluchtenden zylindrischen Bohrungen 8 der den Zungenschlitz 4 beidseitig begrenzenden Nadelschaftwangen 9 mit geringem Lagerspiel drehbar gelagert ist. Die Nadelzunge 6 weist einen Zungenschaft 10 auf, der an der Lagerstelle mit einer der Achse 7 zugeordneten, querverlaufenden, durchgehenden Lagerbohrung 11 versehen ist und endseitig einen Zungenlöffel 12 trägt, welcher in der Schließstellung mit dem Nadelhaken 3 zusammenwirkt, wie dies in Fig. 2 veranschaulicht ist.In the tongue slot 4, a needle tongue 6 is pivotally mounted at a bearing point by means of a transverse axis 7. The axis 7 is designed in the form of a cylindrical steel pin which is rotatably mounted in cylindrical bores 8, which are aligned with one another, of the needle shaft cheeks 9 which delimit the tongue slot 4 on both sides, with little bearing play. The needle tongue 6 has a tongue shaft 10, which is provided at the bearing point with a transverse, continuous bearing bore 11 assigned to the axis 7 and at the end carries a tongue spoon 12 which cooperates with the needle hook 3 in the closed position, as shown in FIG. 2 is illustrated.

Anschließend an den Zungenschlitz 4 ist in dem Nadelschaft 1 eine von der Nadelschaftoberseite ausgehende nutartige Vertiefung 13 ausgebildet, die sich in Nadelschaftlängsrichtung erstreckt und in der ein längliches Federelement 14 einenends verankert ist, das mit seinem anderen Ende 15 in den Zungenschlitz 4 ragt. Das in dem dargestellten Ausführungsbeispiel als gerades Federdrahtstück ausgebildete Federelement 14 kann auch eine Rund-, Flach- oder Vierkantfeder sein; es kann, wie dargestellt, gerade oder auch gekrümmt oder zweckentsprechend abgebogen ausgeführt sein. In der Vertiefung 13 ist das Ende des Federelementes 14 durch Verstemmen bei 16 fest eingespannt. Der Boden 17 der Vertiefung 13 ist zu der Nadelschaftunterseite hin sanft geneigt derart ausgebildet, daß das in dem Zungenschlitz 4 liegende Ende 15 des Federelementes 14 unbehindert auf- und abbeweglich ist.Subsequent to the tongue slot 4, a groove-like depression 13, which extends from the top of the needle shaft and extends in the longitudinal direction of the needle shaft and in which an elongated spring element 14 is anchored at one end, which is anchored at its other end 15, is formed in the needle shaft 1 protrudes into the tongue slot 4. The spring element 14, which is designed as a straight piece of spring wire in the illustrated embodiment, can also be a round, flat or square spring; as shown, it can be straight or curved or appropriately bent. In the recess 13, the end of the spring element 14 is firmly clamped at 16 by caulking. The bottom 17 of the recess 13 is gently inclined toward the underside of the needle shaft in such a way that the end 15 of the spring element 14 lying in the tongue slot 4 can be freely moved up and down.

Der Zungenschaft 10 weist in dem Bereich zwischen der Lagerbohrung 11 und der dem Löffel 12 abgewandten Stirnseite einen verlängerten Endteil 18 (Fig. 3) auf, derart, daß die Nadelzunge 6 einen mittels der Achse 7 schwenkbar gelagerten doppelarmigen Hebel bildet. In dem Endteil 18 ist eine von der Stirnseite bei 19 ausgehende randoffene öffnung 20 ausgebildet, die bis in die Lagerbohrung 11 reicht, derart, daß die die Achse 7 umschließende Lagerschale auf der dem Zungenlöffel 12 abgewandten Seite der Nadelzunge 6 im Bereiche der Öffnung 20 entfernt ist. Die Lagerbohrung 11 ist durch die Öffnung 20 über einen Umfangsbereich von ca. 120° geöffnet, wie dies in Fig. 3 bei 21 angedeutet ist. Die Öffnung 20 selbst ist von der Lagerbohrung 11 ausgehend nach außen zu sich keilförmig erweiternd ausgebildet, wobei der bei 22 angedeutete Öffnungswinkel der Öffnungsberandung ca. 60° beträgt. Sie läßt in dem Endteil 18 der Nadelzunge 6 zwei Schenkel 23, 24 entstehen, die die Öffnung 20 begrenzen und von denen der dem Rücken 25 des Zungenschaftes 10 gegenüberliegende Schenkel 23 auf seiner einen Teil der Öffnungsberandung bildenden Innenseite eine Auflagefläche 26 für das Ende 15 des Federelementes 14 trägt. Die Auflagefläche 26 ist im wesentlichen eben und parallel zu der Vorderseite 27 des Zungenschaftes 10 ausgerichtet.The tongue shaft 10 has an extended end part 18 (FIG. 3) in the area between the bearing bore 11 and the end face remote from the spoon 12, such that the needle tongue 6 forms a double-armed lever which is pivotably mounted by means of the axis 7. In the end part 18 an opening 20 opening from the end face at 19 is formed, which extends into the bearing bore 11, in such a way that the bearing shell surrounding the axis 7 on the side of the needle tongue 6 facing away from the tongue spoon 12 is removed in the region of the opening 20 is. The bearing bore 11 is opened through the opening 20 over a circumferential area of approximately 120 °, as indicated at 21 in FIG. 3. The opening 20 itself, starting from the bearing bore 11, is designed to widen in the shape of a wedge, the opening angle of the opening boundary indicated at 22 being approximately 60 °. It allows two legs 23, 24 to emerge in the end part 18 of the needle tongue 6, which open the opening limit and of which the leg 23 opposite the back 25 of the tongue shaft 10 carries on its inner side which forms part of the opening boundary a bearing surface 26 for the end 15 of the spring element 14. The bearing surface 26 is aligned substantially flat and parallel to the front 27 of the tongue shaft 10.

Der der Auflagefläche 26 gegenüberliegende Schenkel 24 ist in Zungenlängsrichtung verkürzt; er ist endseitig bei 28 abgerundet, so daß seine einen Teil der Berandung der Öffnung 22 bildende Innenfläche über einen abgerundeten Bereich bei 28 an den Rücken 25 des Zungenschaftes 10 anschließend ausgebildet ist.The leg 24 opposite the support surface 26 is shortened in the tongue longitudinal direction; it is rounded at the end at 28, so that its inner surface forming part of the edge of the opening 22 is subsequently formed over a rounded region at 28 on the back 25 of the tongue shaft 10.

Die Nadelzunge 6 ist mit der Achse 7 starr verbunden. Zu diesem Zwecke ist der Zungenschaft 10 an der Achse 7 mittels Laser-Punktschweißen angeschweißt. Die Schweißpunkte sind in Fig. 4 bei 29 angedeutet.The needle tongue 6 is rigidly connected to the axis 7. For this purpose, the tongue shaft 10 is welded to the axis 7 by means of laser spot welding. The welding points are indicated at 29 in FIG. 4.

Die Montage erfolgt in der Weise, daß nach dem Einstecken der zylindrischen Achse 7 in die Bohrungen 8 der Nadelschaftwangen 9 die Nadelzunge 6 von oben her auf die Achse 7 in einer Stellung aufgesteckt wird, in der ihre Längsachse mit der Nadelschaftlängsachse etwa einen Winkel von 90° einschließt, worauf anschließend von unten her durch den Durchbruch 5 mittels Laser die Verschweißung bei 29 erfolgt. Die Nadelzunge 6 bildet so mit der angeschweißten Achse 7 eine untrennbare Einheit, die über die Bohrungen 8 und die Achse 7 in dem Zungenschlitz 4 unverlierbar sowie um die Achse 7 schwenkbar gelagert ist. Das Lagerspiel zwischen der zylindrischen Achse 7 und den zylindrischen Bohrungen 8 ist zweckentsprechend bemessen, so daß einerseits eine leichte Beweglichkeit der Nadelzunge 6 gewährleistet und andererseits ein seitliches Kippen oder Auslenken der Nadelzunge 6 während der Schwenkbewegung vermieden sind.The assembly is carried out in such a way that after inserting the cylindrical axis 7 into the bores 8 of the needle shaft cheeks 9, the needle tongue 6 is pushed onto the axis 7 from above in a position in which its longitudinal axis is at an angle of approximately 90 with the longitudinal axis of the needle shaft ° includes, whereupon the weld at 29 is carried out from below through the opening 5 by means of a laser. The needle tongue 6 thus forms an inseparable unit with the welded axis 7, which is captive via the bores 8 and the axis 7 in the tongue slot 4 and can be pivoted about the axis 7 is stored. The bearing play between the cylindrical axis 7 and the cylindrical bores 8 is dimensioned appropriately, so that on the one hand easy mobility of the needle tongue 6 is ensured and on the other hand lateral tilting or deflection of the needle tongue 6 during the pivoting movement are avoided.

Wie insbesondere aus den Fig. 1,2 zu ersehen, ist die Länge des Federelementes 14 derart gewählt, daß dieses bei in der Schließstellung (Fig. 2) stehender Nadelzunge 6 die Auflagefläche 26 des Zungenendteils 18 übergreift, wobei gleichzeitig das Federelement 14 in der Schließstellung der Nadelzunge 6 gegenüber dem in Fig. 1 dargestellten entspannten Zustand an seinem Ende 15 nach oben zu etwas angehoben und damit vorgespannt ist.As can be seen in particular from FIGS. 1, 2, the length of the spring element 14 is selected such that it overlaps the contact surface 26 of the tongue end part 18 when the needle tongue 6 is in the closed position (FIG. 2), with the spring element 14 at the same time In the closed position of the needle tongue 6, compared to the relaxed state shown in FIG. 1, its end 15 is raised upwards somewhat and is thus prestressed.

Wird, ausgehend von dieser Schließstellung, die Nadelzunge 6 freigegeben, so kann sie von dem vorgespannten Federelement 14 in die in Fig. 1 dargestellte, teilweise geöffnete Zwischenstellung überführt werden, in der die Längsmittelachsen der Nadelzunge 6 und des Nadelschaftes 1 einen Winkel von etwa 30° miteinander einschließen, wie er bei 30 angedeutet ist. Die Größe dieses Winkels hängt von der jeweiligen Nadelkonstruktion ab; sie ist aber in jedem Fall kleiner als 90°.If, starting from this closed position, the needle tongue 6 is released, it can be transferred from the prestressed spring element 14 to the partially open intermediate position shown in FIG. 1, in which the longitudinal central axes of the needle tongue 6 and the needle shaft 1 form an angle of approximately 30 ° include with each other as indicated at 30. The size of this angle depends on the respective needle construction; in any case, it is less than 90 °.

Da die Auflagefläche 26 sich wegen der Öffnung 20 von der Stirnseite 19 bis unmittelbar zu der Achse 7 hin erstreckt, ist sie auch bei kleinen Nadelgrößen ausreichend lang, um einen sicheren Eingriff des Endes 15 des Federelementes 14 zu gewährleisten.Since the support surface 26 extends from the end face 19 to the axis 7 directly because of the opening 20, it is sufficiently long, even with small needle sizes, for a secure engagement to ensure the end 15 of the spring element 14.

Wenn im Verlauf des Maschenbildungsvorganges die Nadelzunge 6 von der in dem Nadelhaken 3 hängenden Masche, ausgehend von der Zwischenstellung nach Fig. 1, im Uhrzeigersinn in Richtung auf die völlig geöffnete Stellung nach Fig. 4 hin verschwenkt wird, hebt sich die Auflagefläche 26 von dem Ende 15 des Federelementes 14 ab. Da die Öffnung 20 sich, ausgehend von der Lagerbohrung 11, zu der Stirnseite 19 hin nach außen zu trichterförmig erweitert,und da der endseitig bei 28 abgerundete, der Auflagefläche 26 gegenüberliegende zweite Schenkel 24 entsprechend kurz bemessen ist, kann die Nadelzunge 6 völlig frei ihre von der Zwischenstellung (Fig. 1) ausgehende Schwenkbewegung in Richtung auf die völlig geöffnete Stellung nach Fig. 4 ausführen, ohne daß sie dabei von dem Federelement 14 beeinflußt wäre. Erst am Ende dieser Schwenkbewegung kommt der zweite Schenkel 24 mit seinem abgerundeten Endteil 28 mit dem Ende 15 des Federelementes 14 in Eingriff, oder aber die Anordnung ist derart getroffen, daß sich die Nadelzunge 6 mit dem Rücken 25 ihres Zungenschaftes 10 sogleich auf das Federelement 14 auflegt, wie dies in Fig. 3 dargestellt ist. Bei fortgesetzter Austriebsbewegung der Zungennadel wird die Nadelzunge 6 sodann, ausgehend von der Stellung nach Fig. 3, von der auf ihr lastenden Masche nach unten gedrückt, so daß das Federelement 14 etwas durchgebogen wird, wenn die Nadelzunge 6 ihre Endstellung nach Fig. 4 erreicht.If, during the course of the stitch formation process, the needle tongue 6 is pivoted clockwise from the stitch hanging in the needle hook 3, starting from the intermediate position according to FIG. 1, in the direction of the fully open position according to FIG. 4, the support surface 26 rises from it End 15 of the spring element 14. Since the opening 20, starting from the bearing bore 11, widens towards the outside towards the funnel-shaped end face 19, and since the second leg 24, rounded at the end at 28 and opposite the support surface 26, is correspondingly short, the needle tongue 6 can be completely free Execute from the intermediate position (Fig. 1) pivotal movement towards the fully open position shown in FIG. 4, without being affected by the spring element 14. Only at the end of this pivoting movement does the second leg 24 with its rounded end part 28 engage the end 15 of the spring element 14, or the arrangement is such that the needle tongue 6 with the back 25 of its tongue shaft 10 immediately contacts the spring element 14 hangs up, as shown in Fig. 3. With continued expulsion movement of the latch needle, starting from the position shown in FIG. 3, the needle latch 6 is then pressed downward by the stitch resting on it, so that the spring element 14 is bent somewhat when the needle latch 6 reaches its end position according to FIG. 4 .

Claims (6)

  1. Latch needle for loop-forming textile machines, with a needle shank (l) and a needle latch (6), which is pivoted in a sawslot (4) of the needle shank (1) by means of a transversely extending axis (7) and which at one end supports a latch spoon (12) adjoining a latch blade (10) and cooperating with the needle head (3) when the latch is in closed position, its latch blade (10) being constructed with a bearing bore (11), and has an end portion (27) extending from the area of the bearing bore (11) to the end remote from the latch spoon (12), and with an elongated spring element (14), which is anchored to the needle shank (1) in the area of its one end and projects into the sawslot with its other free end and overlaps an allocated support surface (26) on the end portion (27) of the latch blade at least when the needle latch (6) is located in the closed position, said needle latch (6) being resiliently transferable into an intermediate partially open position by the spring element (14) engaging on said needle latch, characterised in that in the area of its end portion (18), the latch blade (10) has an open-ended opening (20) extending into the bearing bore (11) with the support surface (26) arranged on the edges of said opening; and that the latch blade (10) is rigidly connected to the axis (7) rotatably mounted in corresponding bores (8) in the needle shank cheeks (9) defining the sawslot (4).
  2. Latch needle according to Claim 1, characterised in that the opening (20) is constructed to widen outwards from the bearing bore (11).
  3. Latch needle according to Claim 2, characterised in that the opening angle (22) of the edges of the opening is approximately 60°.
  4. Latch needle according to one of the preceding claims, characterised in that the opening (20) is defined by two legs (23, 24) of the end portion (18) of the latch blade (10), the leg (23) opposite the back (25) of the latch blade bearing the support surface (26) on its inside; and that the leg (24) opposite the support surface (26) is shorter in the longitudinal direction of the latch.
  5. Latch needle according to one of the preceding claims, characterised in that the latch blade (10) is welded onto the axis (7).
  6. Latch needle according to Claim 5, characterised in that the latch blade (10) is welded on the axis (7) by means of laser spot welding.
EP92117899A 1991-12-19 1992-10-20 Latch needle for stichforming textile machines Expired - Lifetime EP0547331B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4142003A DE4142003C1 (en) 1991-12-19 1991-12-19
DE4142003 1991-12-19

Publications (3)

Publication Number Publication Date
EP0547331A2 EP0547331A2 (en) 1993-06-23
EP0547331A3 EP0547331A3 (en) 1993-06-30
EP0547331B1 true EP0547331B1 (en) 1996-01-10

Family

ID=6447514

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92117899A Expired - Lifetime EP0547331B1 (en) 1991-12-19 1992-10-20 Latch needle for stichforming textile machines

Country Status (6)

Country Link
US (1) US5239844A (en)
EP (1) EP0547331B1 (en)
JP (1) JP2589038B2 (en)
CA (1) CA2084362C (en)
DE (2) DE4142003C1 (en)
ES (1) ES2082324T3 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19712124C2 (en) 1997-03-22 1999-07-01 Groz Beckert Kg Latch needle for stitch-forming textile machines
DE10051029C1 (en) * 2000-10-14 2002-07-11 Groz Beckert Kg Latch needle with resilient tongue support
DE10106989C2 (en) * 2001-02-15 2003-04-24 Groz Beckert Kg Latch with fixed spring
DE10341630B4 (en) * 2003-09-10 2006-11-16 Groz-Beckert Kg latch needle
US7757516B1 (en) 2005-11-21 2010-07-20 Hbi Branded Apparel Enterprises, Llc Abrasive knitting needle and sinker
US7634922B2 (en) * 2005-11-21 2009-12-22 Hbi Branded Apparel Enterprises, Llc Knitting needle for knitting sueded fabrics and methods of knitting sueded fabrics
US7757515B1 (en) 2009-03-11 2010-07-20 Hbi Branded Apparel Enterprises, Llc Cut pile fabric and method of making same
EP3604651A1 (en) 2018-08-03 2020-02-05 Groz-Beckert KG Latch needle

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US219012A (en) * 1879-08-26 Improvement in knitting-machine needles
DE271699C (en) *
DD25292A (en) *
US1032613A (en) * 1911-06-24 1912-07-16 John J Tuller Latch knitting-needle.
US1163296A (en) * 1914-02-13 1915-12-07 Louis N D Williams Knitting-machine.
DE413459C (en) * 1924-06-27 1925-05-14 Christian Speidel Latch needle with exchangeable tongue for knitting machines u. like
GB229204A (en) * 1924-08-12 1925-02-19 Christian Speidel Latch needle with interchangeable latch for knitting machines and the like
CH165483A (en) * 1933-03-06 1933-11-30 Agula Sa Pallet needle for knitting machines.
FR862825A (en) * 1940-01-10 1941-03-17 Device for knotting threads
US2711218A (en) * 1950-09-21 1955-06-21 Vitoux Marcel Method of mounting pivoted latches on self-acting needles for knitting and relooping machines
DE1166919B (en) * 1962-11-02 1964-04-02 Siemens Ag Bandaging needle for the winding heads of electrical machines
DE3702019C1 (en) * 1987-01-24 1987-09-24 Groz & Soehne Theodor Latch needle for stitch-forming textile machines
JPH0223619A (en) * 1988-07-12 1990-01-25 Seiko Epson Corp Manufacture of semiconductor device

Also Published As

Publication number Publication date
EP0547331A2 (en) 1993-06-23
CA2084362A1 (en) 1993-06-20
JPH0657606A (en) 1994-03-01
ES2082324T3 (en) 1996-03-16
EP0547331A3 (en) 1993-06-30
DE59205016D1 (en) 1996-02-22
JP2589038B2 (en) 1997-03-12
US5239844A (en) 1993-08-31
DE4142003C1 (en) 1993-07-22
CA2084362C (en) 1995-02-07

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