EP1270785A1 - Compound needle with improved slider - Google Patents

Abstract

A textile compound knitting needle (1) has a slide (8) with two springs (11, 12) with diverging tips forming a hook-shaped funnel (3) with flattened tip backs (21). The springs narrow towards their tips. This geometric arrangement ensures the needle continues to function correctly even when not fully centred. The two halves of the needle are symmetrical. The length of the flattened tip-backs is less than the length of the funnel formed by the two sides.

Description

The invention relates to a needle with a needle Slider used to open and close the thread space serves.

From DE 25 37 502 is a needle with a two-part slide known. The slider needle has an elongate body at one end goes into a hook. On one of the open side of the Hook's opposite point begins a slide slot, in which the slider is arranged. The slider has two slide springs, which lie flat against each other and together in the slot on the hook and are displaceable from this. The two slider springs are at their hooked corners from each other Bent away to form a funnel for holding the To form a hook tip.

When operating the needle must be ensured that the tip of the hook when opening and closing the thread space always safely in the funnel finds. Poke those Slide springs due to external influences or due to advanced wear on the point of the hook, it comes to malfunctions.

From DE 199 13 822 C2 is a needle known, the slide also from two slide springs consists. These form together at their free ends a funnel and are otherwise bulged away from each other bent. The lateral bulging of the slide springs serves to center them in the slide slot, so that the funnel formed by the slider springs well centered over the tip of the hook can be pushed.

A particularly high reliability in terms of the centering of the hook in the funnel is obtained if the funnel is formed as large as possible. The Magnification of the funnel, however, encounters difficulties because the funnel occurs when the slider is retracted in the slide slot. Enlarged funnels tilt here to increase the friction, which in turn wear and / or heat development can result. This in turn affects the functionality of the Slider needle in its entirety negative, and in extreme cases the slider springs are no longer with the required To move with ease.

On this basis, it is an object of the invention, a Slider needle to create, with low slider friction enables a high level of operational safety.

This task is solved with the needle, the having the features of claim 1.

The slider needle according to the invention has a Slide with two slide springs on. The slider can in one piece or from several individual pieces (slide springs, Slider body) formed with each other are detachably or permanently connected. The ends of the slide springs are trained to rejuvenate. This takes the Thickness of the slider springs in a rejuvenation area, the confined to the funnel area, to the ends of the Slide springs down continuously. This causes at given outer funnel width a larger inner Funnel width, so the safety with the the slider pushed over the hook, even under difficult Conditions and with advanced wear and tear increases. Because the outer contour of the funnel does not widen This is not caused by increased friction he buys. Conversely, the outer width of the funnel be reduced, at the same time a funnel with a Funnel width is obtained, as in conventional slide needles was encountered.

It can also be described here individually Effects are used, namely an increase in the inner width of the funnel combined with a reduction the outer width of the same. Such a needle has, compared to conventional needles, a reduced friction and improved reliability on.

It may be appropriate, only one of the slider springs to rejuvenate and the other in a conventional manner with a non-tapered end train. This is especially useful in cases in where the slide a previously known lateral stitch or other lateral force is exposed. In general, however, a symmetric (mirror image) training of the slide springs preferred, so that the accuracy of the slider and of the hook is generally increased.

The rejuvenation of the slider springs manifests itself in a decrease in the thickness of the slider spring, measured transversely to the direction of movement and at right angles to the side surfaces the slider needle. The thickness decrease is continuous. The free ends of the slide springs are preferably with a very small radius of curvature rounded. Sharp edges are at the free end of the However, slider spring preferably not present. This avoids damages or injuries of the knitted fabric and / or the thread.

The tapering area is preferably shorter than the funnel. In other words, the rejuvenation of the Slider springs is limited to the area thereof, in which they are spread apart.

It is also possible the rejuvenation on one still shorter section, for example, only one Restrict part of the funnel. This increases the stability the slider springs in their funnel area.

The slider springs can in their rejuvenation area have an approximately rectangular cross-section. This is made by a simple flattening of each other reached away curved slide springs. It is alternative possible, the rejuvenation on an example restrict the central part of the slider spring so that These on their inside then with a trough for recording of the hook, which is to the free Ends of the slide springs deepened and widened. Also this measure can change the characteristics of the needle, like stated above, with an additional increased Stability of the slide springs is achieved.

Further details of advantageous embodiments The invention will become apparent from the description which Drawing or dependent claims.

Figur 1

die erfindungsgemäße Nadel mit offenem Fadenraum in perspektivischer Ansicht,

Figur 2

die erfindungsgemäße Nadel mit geschlossenem Fadenraum in perspektivischer Ansicht,

Figur 3

die Nadel nach Figur 1 und 2 ohne Schieber in Draufsicht,

Figur 4

den Schieber der Nadel nach den Figuren 1 und 2 in Draufsicht,

Figur 5

den Schieber der Nadel in einer schematisierten, vergrößerten Darstellung,

Fig. 6-8

Querschnitte der Schieberfedern gemäß Figur 5,

Figur 9

eine abgewandelte Ausführungsform des Schiebers in ausschnittsweiser Draufsicht,

Figur 10

eine weitere Ausführungsform einer Schieberfeder in ausschnittsweiser Draufsicht und

Figur 11

einen Schieber mit Schieberfedern nach Figur 10 in einer Schnittdarstellung.

In the drawings, embodiments of the invention are illustrated. Show it:

FIG. 1

the needle according to the invention with open thread space in perspective view,

FIG. 2

the needle according to the invention with closed thread space in perspective view,

FIG. 3

the needle of Figure 1 and 2 without slider in plan view,

FIG. 4

the slider of the needle according to Figures 1 and 2 in plan view,

FIG. 5

the slider of the needle in a schematic, enlarged view,

Fig. 6-8

Cross sections of the slide springs according to Figure 5,

FIG. 9

a modified embodiment of the slider in a sectional plan view,

FIG. 10

a further embodiment of a slider spring in a sectional plan view and

FIG. 11

a slider with slide springs according to Figure 10 in a sectional view.

FIG. 1 shows a slider needle 1, formed on the base body 2 at one end a hook 3 is. This points with its tip 5 on a Slider slot 4, in the transverse direction Q of two slot walls 6, 7 is limited. In the slide slot 4 is a slide 8 out, to which two slide springs 11, 12th belong. These are held on a slider body 14. The slider is in a longitudinal direction L on the hook. 3 towards and away from this displaceable. From Figure 3 is the Needle body seen in plan view. The hook 3 is flattened laterally. Its side edges 16, 17 are in Figure 3 arched in the top view arcuate inward.

The slider 8 is shown separately in FIG. Its two slide springs 11, 12 are essentially flat against each other. Optionally you can in a region 19 remote from the slider end 18 bulging outward bulging.

The slider end 18 is by two legs 21, 22nd the slide springs 11, 12 defined, away from each other are bent. Thus, the slide springs 11, 12 run in Ends 23, 24, which are spread apart and are held at a distance T to each other. The thigh 21, 22 begin at a contact point 25, in which the Slide springs 11, 12 just rest against each other and begin to diverge to form a funnel 30.

As is apparent from Figure 5, the taper Leg 21, 22 starting from a thickness D in one Rejuvenation area 29 towards their ends 23, 24 out. The Rejuvenation manifests itself in one. Decrease in width, the is to measure vertically in Figure 5 (in the transverse direction Q). It starts at the contact point 25 or at one of the Ends 23, 24 nearer point. The rejuvenation recorded in the illustrated embodiment, the total Height of the respective slider spring 11, 12 completely. This is apparent from Figures 6 to 8. In the Near their ends 23, 24 is the thickness of the slide springs 11, 12, as the section VI-VI in Figure 6 shows, relative low, wherein the cross section of each slider spring 11, 12th is approximately rectangular. At a greater distance to the ends 23, 24, the thickness of the slide springs 11, 12 something larger (see section VII-VII, Figure 7). At one of the Contact point 25 have close to the interface Slide springs 11, 12 already reached their usual thickness, as the section VIII-VIII (Figure 8) shows.

The flattening of the ends 23, 24 or legs 21, 22nd the slide springs 11, 12 leads at a given distance T of the slider spring ends 23, 24 to a larger Width W of the funnel formed by the legs 21, 22 30 reached. FIG. 5 illustrates this. In dashed Lines 26, 27 are the legs and ends of slider springs that does not rejuvenate. These ultimately only lead to a funnel width W1 which is much lower than the actual reached width W.

The needle needle 1 described so far works as follows:

In operation, the needle body 2 and the slider lead 8 with respect to each other a longitudinal movement in the longitudinal direction L off, so that one of the hook 3 and the Slide springs 11, 12 defined thread space 28 opens and closes. When closing the thread space, the one another away spread ends 23, 24 of the slide springs 11, 12 pushed over the hook 3 on both sides. there it is important that the ends 23, 24 not at the Toast hook tip 15. This is achieved by the Ends 23, 24 set the width W, the big in comparison to the width of the hook tip 5 is. At the same time, the distance T, the outer width of the slider 8 at the Ends 23, 24 defined, not or not significantly wider as the slide slot 4. As a result, the slider 8 in the slide slot 4 smoothly, too when the ends 23, 24 entered the slide slot 4 are.

Occurs with increasing duration of use of the needle 1 wear on and / or subject to the slider. 8 a lateral pull, the funnel 30 through the existing play and / or elastic deformation of the Move slide springs 11, 12 sideways slightly. He is thus no longer completely centered to the needle tip 5. Due to the large width W of the opening of the funnel 30 finds the hook tip 5 but also at worst Conditions between the legs 21, 22, without the End 23, 24 to push. The needle 1 is therefore wear-resistant and under unfavorable conditions reliable. The operational safety is not through an increase in the friction of the legs 21, 22 in the Pusher slot 4 bought, because the distance T is despite Enlargement of the width W compared to the conventional one Funnel width W1 not enlarged. At only moderate Enlarging the width W, the distance T can even be reduced.

FIG. 9 illustrates a modified embodiment of the slider 8. The legs 21, 22 of the slide springs 11, 12 are only at their ends in the Rejuvenation area 29 flattened. The rejuvenation area 29 is shorter than the length of the legs 21, 22, about begin at the contact point 25. The flattening in the Rejuvenation area 29 may be formed as a flat surface be.

It is also possible, the flattening not as to form flat surface. This is in Figures 10 and 11 illustrates. Figure 10 shows the leg 22, the contains a well 31 in its center. Like FIG. 11 illustrating a cross-section through the leg 22 at the point XI-XI and a corresponding cross section through the symmetrical leg 21 shows, the taper is on the area of the trough 31 limited, which deepens towards the end 23 and 24, respectively (Figure 10). The trough 31 is arranged at a height, which corresponds to the height of the hook tip 5. Furthermore their direction coincides with the direction of the hook 3.

At the end 23, 24, the slider spring 11, 12, runs, as well as the slide springs 11, 12 of the above-described Embodiments, in a blunt edge 32nd out. Their rounding prevents thread damage.

In a slider needle 1 is a slide 8 with two slide springs 11, 12 are provided, the ends of a form open to the hook 3 indicative funnel. The the funnel forming ends or legs 21, 22 are flattened. The material thickness of the slide springs 11, 12th thus assumes, starting from an initial location, in the Tapering portion 29 to the ends of the slide springs 11, 12 down. This will ensure proper functioning of the Slider needle also achieved when the slide. 8 not completely centered. In addition, the Smooth movement of the slider 8 in the slide slot be improved by the of the legs 21, 22nd formed funnel narrower at constant width can be trained as without rejuvenation of the slide springs 11, 12.

LIST OF REFERENCE NUMBERS

1

needle

2

body

3

hook

4

vane slot

5

hook tip

6, 7

Diaphragm walls

8th

pusher

11, 12

slider springs

14

slider body

16, 17

side flanks

18

spool end

19

Area

21, 22

leg

23, 24

end up

25

contact point

26, 27

lines

28

thread space

29

tapering region

30

funnel

31

trough

32

edge

T

distance

W

width

W1

hopper width

Q

transversely

L

longitudinal direction

Claims (7)

Sliding needle (1), in particular for stitch-forming textile machines,
with a needle body (2) whose shaft carries at one end a hook (3) with a point (5),
with two slot walls (6, 7) parallel to one another and delimiting a slide slot (4) between them,
with a slide (8) which is displaceably arranged in the slide slot (4) and which has at least two slide springs (11, 12), a. with their free, on the hooks (3) to be pointed legs (21, 22) are bent away from each other, so that their ends (23, 24) do not touch, starting from a contact point (25) on the hook ( 3) to form open funnel (30), and b. their limbs (21, 22) to be pointed on the hook (3) taper in a tapering region (29) towards the respective end (23, 24). Slide needle according to claim 1, characterized in that the slide springs (11, 12) are symmetrical to each other at least in a front functional area, which serves the mesh transfer. A slider needle according to claim 1, characterized in that, for the tapering of the legs (21, 22), the thickness of the legs (21, 22) measured in the transverse direction (Q) decreases toward the ends (23, 24). A slider needle according to claim 1, characterized in that the tapering region (29) measured in the longitudinal direction (L) of the slider (8) is shorter than the funnel (30) measured. A slider needle according to claim 1, characterized in that the slide springs (1) are delimited rectilinearly over their entire height at each point of their tapering region (29). A slider needle according to claim 1, characterized in that the slide springs (11, 12) on in the tapering region (29) at least on its inner side a longitudinally arranged trough (31). A slider needle according to claim 1, characterized in that the slide springs (11, 12) have at their ends (23, 24) an edge (32) whose radius of curvature is less than half the thickness (D) of the slider spring (11, 12). ,

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