EP2284308B1 - Sewing machine needle with coupling tool preventing loss - Google Patents

Description

The invention relates to a knitting machine needle in the form of a Rippscheibennadel.

Especially in small circular knitting machines prevail on the Rippscheibe cramped conditions. The dial forms an annular bed for receiving the dial needles, which are also referred to as Rippnadeln. A corresponding small circular knitting machine is for example the WO 2009/013773 A1 refer to. The knitting machine described therein has a knitting cylinder with vertically arranged cylinder needles and a dial with horizontally arranged rib needles. The rib needles are moved by a needle selection mechanism located above the dial. The needle selection mechanism acts via pivotally mounted selections on the Rippnadeln.

In needle selection systems of this type, there is no firm connection between the selections and the ripple needles. The selection parts can move the Rippnadeln only radially outward. In addition, there is the danger that even a slight lateral deflection of the selection part can cause it to miss the needle butt and the needle is not operated properly. Next, the assembly of small circular knitting machine is associated with great manual effort, because the selection parts and the Rippnadeln must be handled separately.

• einen Nadelkörper, der mit einem Haken versehen ist und der an einer von dem Haken beabstandeten Stelle einen von einer Lagerfläche umschlossenen Nadel-Kupplungsausschnitt aufweist, der an seinem Umfang mit einer Lagerfläche versehen ist,
• ein Kupplungsteil, das an einem Ende einen zu dem Nadel-Kupplungsausschnitt passenden Kupplungs-Scheibenkopf aufweist, der an seinem Umfang eine Gegenlagerfläche trägt,
• wobei an dem Kupplungsteil und dem Nadelkörper zueinander passende und wenigstens zeitweilig miteinander in Anlage stehende Querlagerflächen vorgesehen sind, die quer zu den Lagerflächen und Gegenlagerflächen orientiert sind,
• wobei zumindest eine der Querlagerflächen an einer Nase vorgesehen ist, die an dem Kupplungsteil oder dem Nadelkörper angeordnet ist und
• wobei der Nase ein Schlitz zugeordnet ist, der in dem Nadelkörper oder in dem Kupplungsteil ausgebildet ist.

From the EP 1 241 287 A1 a knitting machine needle is known, which is connected to a selection or coupling part, wherein such a connection allows a pivoting movement of the selection or the coupling part. The knitting machine needle has the following:

• a needle body provided with a hook and having, at a location spaced from the hook, a needle coupling hole surrounded by a bearing surface provided with a bearing surface at its periphery;
• a coupling member having, at one end, a coupling disk head mating with the needle coupling cut-out and having an abutment surface at its periphery;
• wherein mutually matching and at least temporarily abutting each other transverse bearing surfaces are provided on the coupling part and the needle body, which are oriented transversely to the bearing surfaces and abutment surfaces,
• wherein at least one of the transverse bearing surfaces is provided on a nose, which is arranged on the coupling part or the needle body and
• wherein the nose is associated with a slot formed in the needle body or in the coupling part.

These connections are releasable connections which are preferably releasable with respect to the transverse direction to the longitudinal axis of the knitting machine needle. As a result, the assembly and disassembly of the knitting machine needle and the selection or the coupling part can be difficult.

On this basis, it is an object of the invention to provide a knitting machine needle in the form of a Rippscheibennadel, indicate in which a positive connection between the selection part and the Rippnadel is given.

• Die erfindungsgemäße Strickmaschinennadel weist einen Nadelkörper auf, der mit einem Auswahlteil verbunden ist. Das Auswahlteil kann auch als Kupplungsteil ausgebildet sein. Zur Verbindung dient eine Scharnieranordnung oder Gelenkanordnung, die in einer Ausführungsform einen an der Nadel angeordneten Kupplungsausschnitt und einen an dem Kupplungsteil angeordneten Scheibenkopf aufweist. In einer anderen Ausführungsform ist der Kupplungsausschnitt an dem Kupplungsteil vorgesehen, während der Scheibenkopf an dem Nadelkörper ausgebildet ist. In beiden Fällen ist der Scheibenkopf jeweils an seinem Umfang mit einer Lagerfläche versehen, der eine an dem Kupplungsausschnitt ausgebildete Gegenlagerfläche zugeordnet ist. Durch diese Anordnung der Lagerfläche und Gegenlagerfläche lässt sich eine präzise spielarme und leichtgängige Lagerung bewerkstelligen. Es wird eine gute Kraftübertragung von dem Kupplungsteil auf den Nadelkörper in Nadelkörperlängsrichtung sowohl in Austreibrichtung als auch in Rückzugsrichtung bewirkt.

This object is achieved with the Rippscheibennadel according to claim 1:

• The knitting machine needle according to the invention has a needle body which is connected to a selection part. The selection part can also be designed as a coupling part. To connect a hinge assembly or hinge assembly is used, which has an arranged on the needle coupling cutout and arranged on the coupling part disc head in one embodiment. In another embodiment, the coupling cutout is provided on the coupling part, while the disk head is formed on the needle body. In both cases, the disk head is provided in each case at its periphery with a bearing surface, which is associated with a trained on the coupling neck abutment surface. This arrangement of the bearing surface and abutment surface can accomplish a precise low-backlash and smooth-running storage. There is a good force transmission from the coupling part to the needle body in Nadelkörperlängsrichtung effected both in the expulsion and in the withdrawal direction.

A bearing surface of a coupling cutout surrounds a disk head on its circumference at least three sides and thus forms a joint arrangement. The three-sided enclosing is achieved by the bearing surface extending through an angle of more than 180 ° around the pivot axis of the joint. Thus, the disk head is secured in the cutout in all directions radially to the pivot axis.

The hinge arrangement formed by the disk head and the coupling cutout defines a pivot axis. The pivot axis is oriented in a Z-direction, which is to be understood transversely to the needle body. The longitudinal direction of the needle body is considered as the X direction. Perpendicular to both the X and Z directions is the Y direction, which is also referred to as the high direction. In at least one pivot position, the coupling part extends in this vertical direction or Y-direction. Depending on the installation situation, the coupling part may also extend in a direction that deviates from the Y direction.

Due to the design of the hinge arrangement in the form of a disk head and an associated coupling cutout, the coupling part is coupled to the needle body at least in the X direction. In order to produce captive security in the Z-direction, mutually matching and at least temporarily mutually abutting transverse bearing surfaces are provided on the coupling part and the needle body. These transverse bearing surfaces are at least then in contact with each other when the coupling part and the needle body are in such a pivotal position to each other, as it is assumed when the coupling part and the needle are to be mounted in the dial or another needle bed. For example, this is a position in which the coupling part is slightly inclined to the vertical direction. By this measure, the coupling part and the needle body are prevented from being mounted during mounting, i. when inserting into the needle bed, accidentally fall apart. The handling of the existing of the needle body and the coupling part unit is greatly facilitated.

The coupling cutout can be a C-shaped cutout be. Its edge thus follows in sections a circular arc. In the case of the U-cut is in principle a falling apart of coupling part and needle body in the Y direction possible. In the case of the C-section, the coupling between the needle body and coupling part is given in both the X and Y directions. In both cases, the coupling in the Z direction is effected by the transverse bearing surfaces.

The transverse bearing surfaces are located outside of the disk head and in the region bounded by the coupling cutout. This applies both to the arrangement of the disk head on the coupling part as well as for embodiments in which the disk head is arranged on the needle body.

• Figur 1 eine Strickmaschinennadel, in perspektivischer Darstellung mit zugeordnetem, Kupplungsteil in abschnittsweiser Darstellung,
• Figur 1a ein im Horizontalschnitt veranschaulichtes ausschnittsweises Detail aus der Strickmaschinennadel nach Figur 1
• Figur 2 die Strickmaschinennadel nach Figur 1 mit Auswahlteil, in schematischer Seitenansicht,
• Figur 3 die Strickmaschinennadel nach Figur 1, in einer ausschnittsweisen Seitenansicht, und
• Figur 4 eine abgewandelte Ausführungsform der erfindungsgemäßen Strickmaschinennadel, in ausschnittsweiser Seitenansicht.

Further details of advantageous embodiments of the invention are the subject of the drawing, the description or claims. The description is limited to essential aspects of the invention and other conditions. The drawing should be used as a supplement: It shows:

• FIG. 1 a knitting machine needle, in perspective view with associated, coupling part in sections,
• FIG. 1a a detail of the knitting machine needle illustrated in horizontal section FIG. 1
• FIG. 2 the knitting machine needle behind FIG. 1 with selection part, in schematic side view,
• FIG. 3 the knitting machine needle behind FIG. 1 in a fragmentary side view, and
• FIG. 4 a modified embodiment of the knitting machine needle according to the invention, in a sectional side view.

In FIG. 1 is a knitting machine needle 1 illustrated, which is prepared for use in a dial and thus can be referred to as Ripple needle or Rippnadel. However, the invention is not limited to Rippnadeln, but can also apply to knitting machine needles that are not used in dials.

To the knitting machine needle 1 include a needle body 2 and a coupling part 3. The needle body 2 is preferably formed as an elongated flat part. At one end it is provided with a hook 4, which serves the stitch formation. The hook 4 may be associated with other elements, such as a pivotally mounted in the vicinity of the hook 4 tongue 5. This is pivotally mounted in a tongue slot 6 so that its end 7 cover the tip of the hook 4 and thus close the hook 4 or can also go in reserve in a position remote from the hook 4, to release the hook 4.

On a flank 8 of the needle body 2, a cap spring 9 may be provided, which is held at one end 10 fixed to the needle body 2. Its tip 11 may rest against the flank 8 or the bottom of a depression located there. Between the cap spring 9 and the flank 8 of the needle body 2, a puncture chamber 12 is preferably defined, through which another needle for stitch transfer can pierce.

From the cap spring 9, the needle body 2 extends to a remote from the hook 4 end 13. Between the end 13 and the cap spring 9 is a hinge assembly 14 for pivotally mounting the coupling part 3 formed on the needle body 2. This hinge assembly 14 defines a pivot axis that coincides with the Z direction coincides and is thus oriented parallel to the pivot axis of the tongue 5. For clarity, in FIG. 1 the directions X, Y and Z are entered. The X direction coincides with the longitudinal direction of the needle body 2. The Z direction is the associated transverse direction and the Y direction is the associated vertical direction. For additional understanding is on FIG. 2 which shows a simplified isometric side view with the associated coordinate directions X and Y.

To the hinge assembly 14 includes a disk head 15 and a matching coupling cutout 16. The disk head 15 is attached to the coupling part 3 and is therefore referred to as a clutch disk head 15. The coupling cutout 16 is attached to the needle body 2 and is therefore referred to as a needle coupling cutout 16. The disk head 15 is preferably a circular disk. In other words, its edge follows more than 180 ° in a circular arc. It is possible that this arc is interrupted by recesses (not shown). The coupling cutout 16 is a C-shaped cutout. Its edge follows a circular arc whose radius is only slightly larger than the radius of the edge of the disk head 15. The disk head 15 has flat sides in the Z direction whose distance from one another determines the thickness D1 of the disk head 15. The section of the needle body 2 which surrounds the coupling cutout 16 likewise has flat sides whose spacing determines the thickness D2 of the needle body in this area. This thickness D2 coincides with the aforementioned thickness D1. For clarification is on FIG. 1a referenced, the a horizontal section through the knitting machine needle 1 after FIG. 1 approximately at the level of the dashed line 17 illustrated. The thickness ratios are also comparable below this line 17 approximately at the height of the line 30.

The coupling disk head 15 is provided on its outer circumference with an abutment surface 18. This follows a circular arc and is thus cylindrical or partially cylindrical. However, it can also be formed spherical or slightly conical.

The associated needle coupling cutout 16 has a bearing surface 19 which encloses the abutment surface 18 ( FIG. 3 ). As a result, the coupling disk head is mounted pivotably in the needle coupling cutout 16 with little play. During a pivoting movement of the coupling part 3, the abutment surface 18 is guided by the bearing surface 19. On the hinge assembly 14 or in the vicinity thereof, a transverse securing means 20 is arranged. This serves to keep the clutch disk head 15 captive in the needle coupling recess 16 when the knitting machine needle 1 is removed from the needle bed, ie, for example, the dial. In the present exemplary embodiment, the transverse securing means 20 comprises a nose 21 formed on the coupling part 3 whose thickness to be measured in the Z direction is smaller than the thickness D1 of the coupling part 3 to be measured in the same direction. The nose 21 is here, for example, on the needle body 2 formed recess in the form of a slot 22, which is adapted to receive the nose 21. For further clarification is in this context also on FIG. 1a directed. The slot 22 may be disposed adjacent to or in direct connection with the needle coupling recess 16. The spatial assignment is preferably made such that the nose 21 is in the slot 22 when the coupling part 3 in an assembly, disassembly position starting from the position to FIG. 2 slightly to the left, that is inclined towards the hook 4. The nose 21 preferably has two flat transverse bearing surfaces 21a, 21b arranged parallel to each other are. The slot 22 is preferably bounded by two mutually parallel transverse bearing surfaces 22a, 22b. When the nose 21 is in the slot 22, the transverse bearing surfaces 21a, 21b are supported on the transverse bearing surfaces 22a, 22b in the Z-direction.

Preferably, the nose 21 and the slot 22 with respect to the needle body 2 and the coupling part 3 are centered and arranged symmetrically to the center plane extending in the X and Y direction.

The dimensions of the nose 21 and its associated slot 22 are made such that in the assembly, disassembly position between the transverse bearing surface 21 a, 21 b of the nose 21 and its associated transverse bearing surface 22 a, 22 b of the slot 22 creates a frictional engagement and thus the coupling part is frictionally connected with the needle body 2. For this purpose, it is possible that the transverse bearing surfaces 21a and 21b are arranged conically, converging at an acute angle and thus decreases the thickness of the nose 21 in the direction of its tip. The slot 22 may then be formed congruent to the nose 21, wherein the opening of its nose 21 associated with the tip has a greater width than the slot bottom. As a result, the nose 21 can be easily inserted into the slot 22. In order to influence the frictional engagement between the needle 21 and the slot 22, the conicity of the nose 21 and the slot 22 may differ from each other and be formed differently strong.

During operation of the knitting machine needle 1, this can be reciprocated by a corresponding movement of the coupling part in the X direction. The coupling part 3 can perform a pivoting movement to the needle body 1 to effect the knitting operation in the X direction move forward or backward. In this case, the clutch disk head 15 performs a limited rotational movement within the needle coupling section 16. The conditions can be such that the lug 21 is permanently inside the slot 22. However, it is also permissible that the nose 21 leaves the slot 22. Within the needle bed, ie the dial, the coupling part 3 and the needle body 2 are held together by the flanks of the respective needle channel, provided it is ensured that the hinge assembly 14 does not leave the needle channel.

In contrast, when the hinge assembly 14 leaves the needle channel, the nose 21 is previously dipped in the slot 22, thus ensuring the connection between the coupling part 3 and the needle body 2 in the Z direction. This connection is also given when the needle body 2 and the coupling part 3 are removed, for example, for disassembly of the dial.

Unlike in Figure 1 to 3 illustrated, the nose 21 may also be part of the needle body 2, while then the slot 22 is attached to the coupling part 3. It is both possible to arrange the combination of nose 21 and slot 22 on the hook 4 side facing the coupling part 3, similar to in FIG. 1 shown, as well as, at the rear, the end 13 facing side. Also, two lugs 21, one on the hook 4 side facing and on the opposite side facing the end 13 may be provided on the coupling part 3, then corresponding slots 22 may be provided on both sides of the hinge assembly 14 to the respective Nose 21 record. Also, on both sides of the hinge assembly 14 may be arranged on the needle body 2 lugs 21, which engage in corresponding slots 22 of the coupling part 3 grasp.

FIG. 4 illustrates a further modified embodiment of the knitting machine needle according to the invention 1. This embodiment differs by the formation of the hinge assembly 14. The disk head is now associated with the needle body 2, which is why it is referred to here as a needle-disk head 23. The coupling cutout is here associated with the coupling part 3, which is why it is referred to here as coupling part coupling cutout 24. With regard to all other features and variations, in particular with regard to the abutment surface 18, the bearing surface 19, the nose 21 and the associated slot 22, the above description applies accordingly.

In all the embodiments described above, the transverse securing means 20 is disposed outside of the hinge assembly 14.

The coupling between the coupling part 3 and the needle body 2 is provided in all the embodiments described above in that the bearing surface 19 extends through more than 180 ° about the respective disk head 15 and 23 around, so a C-shaped coupling cut is formed.

To simplify the handling of knitting machine needles and associated coupling parts, especially in the assembly of dials, a knitting machine needle is provided with pivotally mounted on this coupling part. For lateral securing of the coupling part 3 on the needle body are transverse bearing surfaces 21a and b and 22a and b, which are at least temporarily in contact with each other.

reference numeral

1

Knitting machine needle

2

needle body

3

coupling part

4

hook

5

tongue

6

latch slot

7

The End

8th

flank

9

transfer spring

10

The End

11

top

12

Einstechraum

13

The End

14

hinge assembly

15

Clutch wheel head

15a, 15b

head halves

16, 16 '

Needle clutch cutout

17, 30

line

18

Thrust face

19

storage area

20

Cross-securing means

21

nose

21a, 21b

Cross bearing surfaces

22

slot

22a, 22b

Cross bearing surfaces

23

Needle wheel head

24

Coupling part coupling cutout

Claims (9)

1. Rib dial needle (1),
   with a needle body (2) which is provided with a hook (4) and, at a location spaced from the hook (4), has a needle coupling recess (16) surrounded by a bearing face (19) or alternatively a needle dial head (23) provided with a bearing face (19) on its periphery,
   with a coupling part (3) which at one end has a coupling dial head (15) adapted to the needle coupling recess (16) and carrying a counter bearing face (18) on its periphery, or alternatively a coupling part coupling recess (24) surrounded on three sides by bearing face (19) and adapted to the needle dial head (23),
   wherein on the coupling part (3) and the needle body (2), mutually adapted transverse bearing faces (21a, 21b, 22a, 22b) are provided which are in contact with each other for at least some of the time and are oriented transversely to the bearing faces (19) and counter bearing faces (18),
   wherein at least one of the transverse bearing faces (21a, 21b, 22a, 22b) is provided on a lug (21) which is arranged on the coupling part (3) or the needle body (2), and wherein a slot (22), which is formed in the needle body (2) or in the coupling part (3), is assigned to the lug (21),
   wherein the dimensions of the lug (21) and its assigned slot (22) are selected such that in the mounting and removal position, a friction connection occurs between the transverse bearing face (21a, 21b) of the lug (21) and its assigned transverse bearing face (22a, 22b) of the slot (22), and thus the coupling part (3) is connected to the needle body (2) by friction fit.
2. Rib dial needle according to claim 1, characterised in that the needle coupling recess (16) is a C- or U-shaped recess.
3. Rib dial needle according to claim 1, characterised in that the coupling dial head (15) is a circular dial head.
4. Rib dial needle according to claim 1, characterised in that the coupling part coupling recess (24) is a C- or U-shaped recess.
5. Rib dial needle according to claim 1, characterised in that the needle dial head (23) is a circular dial head.
6. Rib dial needle according to claim 1, characterised in that the needle coupling recess (16) together with the coupling dial head (15), or alternatively a coupling part coupling recess (24) together with the needle dial head (23), forms a hinge arrangement (14) with a pivot axis which is oriented transversely to the knitting machine needle (1).
7. Rib dial needle according to claim 1, characterised in that at least one of the transverse bearing faces (21a, 21b, 22a, 22b) is arranged on a region surrounded by the needle coupling recess (16) or by the coupling part coupling recess (24).
8. Rib dial needle according to claim 1, characterised in that at least one of the transverse bearing faces (21a, 21b, 22a, 22b) is arranged outside a region surrounded by the needle coupling recess (16) or by the coupling part coupling recess (24).
9. Rib dial needle according to claim 1, characterised in that the dial head (15), the coupling part (13) and the needle body (2) have a uniform, mutually corresponding thickness (d1, d2).

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