EP1028185B1 - Transfer needle for stitch transfer - Google Patents

Description

The invention relates to a neck needle for stitch-forming machines for the manufacture of textiles Fabrics.

For the production of, for example, patterned knitted fabrics Circular knitting machines with cylindrical needles and disc needles serve. Individual stitches correspond to the pattern from cylinder needles to disc needles or vice versa transfer. Special needles, the stitch transmission elements, serve this purpose have and transfer needles or transfer needles to be named.

From DE 42 31 015 C2 are such, as needles trained, known needles that are one slider to open longitudinally through its shaft and closing a hook carried by the shaft. There is a shoulder spring on the side of the slide needle attached that with the needle shaft a space through which the hook and shaft of another Can pass the needle. The neck spring is only held at one end on the needle body. For the suitable Formation of the space between the neck spring and the needle shaft is provided with a recess, that cuts both the slider and the shaft.

The corresponding cut surfaces of the slide and of the shaft form a guide surface, both facilitate the penetration of another needle into the space should.

DE 1 560 996 is a stitch transfer needle or neck pin that is not known as a slide pin, but is designed as a latch needle. Corresponding it has a solid needle shaft without a slide element on. In order to effect the stitch transfer, the latch needle points a laterally cranked shaft. The one from that Part of the Shank is stepped and has a high and a low section. Starting from the low Section extends a groove over the back of the needle up to the high shaft section in which the groove extends over the Side face of the needle opens completely.

The side cranking of the shaft is in many cases not wanted.

DE 31 45 708 C2 is for flat knitting machines provided transfer needle known for stitch transfer a shoulder spring on its side ("Spread spring"). This is as a leaf spring trained and with one end fixed to the needle shaft connected. The other, free end of the leaf spring forms with the needle shaft a space into which another Needle with its hook and shaft can enter. Both the leaf spring and the needle shaft are on their respective underside with an oblique guide surface provided that the penetration of a needle in the Space between the spreading spring and the needle shaft should facilitate. The one provided on the shaft The guide surface is largely flat. It stretches from the back of the needle to the side of the needle.

In particular, the neck spring is subject to the neck needle while operating a relatively strong dynamic Burden. To take over the stitch, check and part of the shaft of another lanyard initially near the free end of the neck spring in the space on. The free end of the neck spring can already be used from the needle shaft to which the neck spring is attached is to be pushed sideways. This is done in a narrow needle guide channel, on the flank of which the neck spring can be relative to the neck spring strong local deflections result in excessive loads to lead. If this causes a broken spring, it is Lanyard no longer operational. The person in question The knitting machine must then be stopped and serviced.

A neck needle is known from DE-A-2847972, the one shaft with one held laterally on the shaft Has neck spring. On the shaft is below the Neck spring formed a side recess that inserting another needle to take over stitches should facilitate. The recess has a first, at the needle back surface section, a middle, adjoining this surface section Surface section that is approximately parallel to the flank of the shaft is aligned, and a third surface section, that borders the flank of the shaft. The first and the third surface sections close together butt Angle that opens away from the neck spring.

This configuration leads to a relatively strong one lateral pushing out of the piercing needle and in succession its a heavy load on the neck spring.

Based on this, it is an object of the invention To improve the life of such capes.

This task is done with a lanyard according to claim 1 solved:

The neck needle according to the invention has on its side surface a recess on that from a neck spring is covered. The latter is one-sided with the needle body connected and lies with a preferably tapered Tongue in a recess in the needle shaft. The The recess places a guide surface on the needle shaft stuck to the penetrating hook of another needle can slide along. The guide surface extends along the recess from the needle back to the needle side surface. In doing so, she changes her way Angle to the back of the needle. In other words, the leadership area has a border on the back of the needle, first section and a bordering side of the needle, second section, with both sections together enclose an obtuse angle. So that is Guide surface is concave. By this measure the needle shaft becomes too weak in the area the recess avoided. In doing so, it becomes possible the depth to enlarge the recess compared to conventional geometries, without excessive weakening of the needle shaft to have to put up with. Ultimately, it can the timing of the deflection of the neck spring influence positively. There may be spring breaks as they result the dynamic load on the neck spring in particular avoided in the area of their free end become. The lifespan or life expectancy of a such a cap is improved.

The neck needle according to the invention can be designed in this way that the leadership area is in the neighborhood of that Needle back a small angle against the (main) direction the movement of a penetrating cap needle. This makes a penetrating cap needle relative slowly turned sideways and comparatively gradually accelerated. Not only the neck spring, but also also protected the penetrating cap needle.

In addition, the neck needle according to the invention through the special design of the guide surface of the smooth transition from the top of the needle to the side of the needle not impaired to form the stitch support edge. The depth of the piercing space can, however, be increased become. The recess can be designed so that it ends on the side surface of the cape. The stitch support edge can thereby go through in this area without formed the recess caused profile change become. This ensures that stitches are gentle and injury free slide over this stitch support edge.

The concave shape of the guide surface can vary Way to be obtained. For example. can the guide surface first in the longitudinal direction of the cape be arched at least in sections. In addition can the guide surface with respect to one by the plunge movement of the transfer needle in certain directions arched or buckled one or more times his. The curvature can be an arc, a parabola or follow another curve. In any case but the recess can be formed deeper than before without the stitch support edge or the stability of the stitch-forming area of the neck needle is negative to influence. In embodiments, the Cut-out compared to neck needles with a straight guide surface at the level of the lower edge of the neck spring by 0.1mm be deepened. This corresponds to at least half Neck spring thickness. By deepening the recess becomes the chronological sequence of the movements of the cape needles and their parts so far positive during the transfer process influenced that the neck spring is less strong bends, which is equal to a relief of the neck spring comes. In addition, the insertion process is due to the enlargement between the neck spring and the guide surface existing space facilitated. The stabbing Lanyard now has more space.

Alternatively and with basically the same effect the guide surface has a crease line and through two essentially flat surface areas be fixed.

Appropriate angular ranges for the lower part of the Guide surface (in the vicinity of the needle back) are less than 20 ° (preferably 18 °) perpendicular to one straight line at the back of the needle. The upper part of the guide surface (adjacent to the needle side surface) preferably more than 20 ° to this perpendicular. At the The angle of the needle side surface is preferably still clear is set larger and is, for example, 25 ° or also more than 30 °. The depth of the recess can be dimensioned in this way be on the back of the needle more than half the width the cape takes. At the bottom of the Neck spring, however, the depth of the recess is preferably already less than half the shaft thickness. In at this height, a crease line can be arranged at which the slope of the guide surface changes. alternative a curvature of the guide surface can begin here or change.

Favorable geometric conditions and favorable conditions for the movement of the piercing neck pin arise when the recess on the needle back more than half the width of the cape. The transition the guide surface from a first angular orientation to another angular orientation is preferably in Essentially level with the lower edge of the neck spring established.

Fig. 1 eine Umhängenadel, in einer vereinfachten perspektivischen und ausschnittsweisen Darstellung,

Fig. 2 die Umhängenadel nach Figur 1, in einer ausschnittsweisen Seitenansicht,

Fig. 3 die Umhängenadel nach Figur 2, in einer Draufsicht und in Anlage mit der Flanke eines Nadelkanals,

Fig. 4 die Umhängenadel nach Figur 2, geschnitten an der Schnittlinie IV-IV, und

Fig. 5 bis Fig. 7 die erfindungsgemäße Umhängenadel im Vergleich zu einer konventionellen Umhängenadel, in verschiedenen Arbeitsstadien.

Advantageous details of an embodiment of the invention emerge from the drawing, the associated description and / or subclaims. Show it:

1 is a neck needle, in a simplified perspective and partial representation,

2 shows the neck needle of Figure 1, in a partial side view,

3 shows the transfer needle according to FIG. 2, in a top view and in contact with the flank of a needle channel,

Fig. 4, the neck needle of Figure 2, cut on the section line IV-IV, and

5 to 7 the neck needle according to the invention in comparison with a conventional neck needle, in different working stages.

In Figure 1 is a neck needle 1 based on her Shaft 2 and its hook 3 and the associated elements illustrates, with the needle foot in the illustration has been omitted. The shaft 2 is divided into a high section 4 and a low section 5. Both sections 4, 5 project from a common needle back 6 starting from. In the transition from the high section 4 of the shaft 2 faces the low section 5 the shaft 2 has a step 8 on its upper side 7. On The shaft 2 extends in both sides of the step 8 a longitudinal direction L cranked and straight, which with the Main direction of movement of the transfer needle 1 matches.

In the area of the transition between sections 4 and 5, i.e. about below level 3, is in the Shaft formed a recess 11 that the receiving the hook of a further transfer needle 1 'is used. This is particularly indicated in Figure 2. The recess 11 forms a lateral recess in the shaft 2 and runs thus from the needle back 6 to one between Needle back 6 and top 7 extending needle side surface 12. Between the needle side surface 12 and the top 7 is a mesh support edge 14 formed by the recess 11 is not reached.

The recess 11 is largely from a neck spring 15 covers that in the present embodiment is designed as a box spring. The neck spring 15 is a leaf spring with a flat, essentially rectangular holding section 16 which in a lateral Recess 17 of the shaft, for example by means of several impressions 18, is held. Handed out of the holding section 16 the neck spring 15 is cranked away from the shaft 2, so that another section 19 of the neck spring parallel and at a distance from the rest of the shaft 2 extends. In the corresponding section 19 adjacent The area of the shaft 2 can be somewhat thick be reduced. The shaft 2 can thus from the crimping point the shoulder spring 15 starting from a point 21 slightly be narrower than in the rest Areas.

The height of section 19 of the neck spring 15 is reduced with respect to the longitudinal direction L of the shaft 2 with a level 22 approximately in the same place as in the shaft 2 can be found. This is particularly the case Figure 2 shows the neck needle 1 in side view illustrated. Starting from level 22, it narrows the neck spring 15 continues so that it ultimately turns on their end 23 ends more or less pointedly. The bend the neck spring 15 can be seen in particular in FIG. 3. The neck spring 15 extends from their offset 24 approximately parallel to the shaft 2, the tapered section with its end 23 again the shaft 2 is bent and here in a groove 25 the shaft 2 is under prestress. Between the section 19 and a subsequent tapered section 9 of the neck spring 15 and the shaft 2 is thus a lancing space 27 (space) formed because of the formation of the neck spring 15 as a so-called box spring is sometimes referred to as box room 27. The neck spring points between the crank 24 and the step 22 15 on the flat, plate-like section 19. This and / or section 9 lies on a flank F. a needle channel or can at least with this to come into a position.

The recess 11 is opposite on the top 7 one in the side surface adjoining here recess 28 formed therein, which the Guidance of stitches lying on the shaft 2 is used. The Recess 28 is opposite the recess 11, so that there is a reduction in the cross section of the shaft 2 results. To keep this as low as possible, the comparatively larger recess 11 the special, in Figure 4 illustrated form.

The recess 11 is towards the shaft 2 from one Limited guide surface 29, which is following the Needle back 6 at an acute angle to a direction V (figures 1 and 4) extends at right angles to the needle back 6 is oriented and roughly indicates the direction, in which a piercing cap needle 1 '(Fig. 3) is moved. The guide surface 29 is facing the Needle side surface 12 is concave. It shows one first surface area 31, which directly adjoins the Needle back 6 connects and at least in a middle Area is at least approximately planar. In The recess 11 runs in the longitudinal direction L on the shaft 2 preferably flat at both ends. Here can surface area 31 may be somewhat curved.

About the same height as a straight one Lower edge 32 of the neck spring 15 changes the guide surface 29 their angle of inclination. It goes at a kink line 33, for example, in a second flat area, which is again flat 34 (section) over, for example with an angle of more than 25 °, for example with 30 ° against the direction V is inclined. To illustrate the effect of this measure, is in Figure 4 with a dashed line 35 Drawn the course of a guide surface, which at would result in an angle of 25 °. Obviously it is the recess is considerably smaller. The additionally won Free space of the recess is designated 30. On the other hand would a continuous arrangement of the guide surface 29th at an angle of 18 ° cause the guide surface 29 reach the stitch support edge 14. Through the Subdivision of the guide surface 29 into two in one blunt Surface areas 31, 34 inclined at an angle to one another however, the cross-sectional area shown in black in FIG. 4 becomes of the shaft 2 for the shaft 2 and thus preserved in favor of its stability. The depth 30 of the Recess 11 is measured on the lower edge 32 of the neck spring 15, opposite a continuous guide surface significantly enlarged with the angle of 25 °. The increase the depth of the recess 11 can be more than half the thickness of the neck spring 15.

The second surface area 34 can, as in FIG indicated by a line 36, flat, i.e. within the Cutting plane are formed straight. However, it can also have a radius R, i.e. arched become. The curvature can be constant, i.e. a constant Have radius. Alternatively, the radius also change depending on the angle, so that deviating from the circular arc Curvatures are achievable.

The transfer needle 1 works as illustrated in FIG. 2:

To pass stitches on section 5 of the Shafts 2 lie, the further transfer needle 1 'sticks in the box space 27, the neck spring 15 with its End 23 abuts the shaft 2 in the groove 25. This is in particular the right, upper half of FIG. 5 remove. Here is the neck needle 1 according to the invention Comparison to a conventional cap needle 1a undivided guide surface at the beginning of the grooving process illustrated. Because of the result of the subdivision the deepening of the recess resulting in the guide surfaces 11 in the neck needle 1 according to the invention Compared to the conventional shoulder pin 1a, that highlights End 23 of the neck spring 15 not from the shaft 2 of the Lanyard 1 off.

The situation is different with the cap 1a according to the prior art, as shown in FIGS. 5 to 7 is shown on the left. It is for reference same reference numerals, supplemented with a to distinguish them Letter index "a" used. The invention Shoulder needles 1 and the conventional shoulder needles 1a are on the right and left sides in Figures 5 to 7 illustrated in the same working stage.

At the beginning of the piercing process, it becomes apparent that the Neck spring 15a of the conventional neck needle 1a the penetrating cap needle 1a 'is lifted from the shaft 2a becomes. It is against the flank F of the needle channel urged in which the cap needle 1a runs. The corresponding one Support point at which the neck spring 15a on the Edge F starts, is designated by 40 in FIG. It this results in a short lever length of the deflected section the neck spring 15a on the tapered Section 9a of the neck spring 1a. This corresponds to one high material load, like the figure on the right 5 shows in the case of the transfer needle 1 according to the invention is avoided.

The example shown in Figure 2 in side view The piercing process begins near the free end of the neck spring 15. When piercing the penetrating cap needle 1 'in the direction of obliquely upwards directional arrow 41 moves. Moved accordingly the penetrating cap needle 1 'or 1a' in the course the piercing process from the free end 23 of the neck spring 15, 15a away. The neck spring 15 is in the invention Lanyard l still in contact with the Shank 2 while still advancing with the conventional cap needle 1a, as in FIG. 6 illustrated on the left, still lifted from the shaft 2 is.

Only with the progressive piercing process as in Figure 7 is illustrated, the piercing neck needle penetrates 1 'so far into the puncture chamber 27 that they with its hook leaves the guide surface 29 and the Side surface 12 of the transfer needle 1 reached. At the same time the needle 1 'so far in the direction of arrow 42 (Figure 2) penetrated to an area sufficient Distance between the neck spring 15 and the side surface 12 reached to be able to advance without the neck spring 15 significantly deflect. The result is the piercing process the transfer needle 1 'by the according to the invention modified shape of the guide surface 29 so far optimized, that the bending load of the neck spring 15 compared decreases to the state of the art. The lifespan is increasing. In the case of a transfer needle, there is a recess in the shaft 2 11 provided, which is covered by a shoulder spring 15 becomes. The recess creates a guide surface 29 fixed with the neck spring 15 a puncture 27th for a penetrating or piercing cap 1 ' stipulates the transfer of stitches. The guide surface 29 is divided into at least two surface areas 31, 34 which blunt with each other, to the neck spring 15 Include an opening angle. The single ones Surface areas 31, 34 can each be flat or be arched. Overall, there is a concave Design of the management area, what the dynamic Loads on the neck spring 15 reduced.

Claims (11)

1. Transfer needle (1) for loop-forming machines
   with a needle body, which has an elongated blade (2) with a needle back (6) and needle side face (12),
   with a transfer spring (15), which is held on the blade (2) and defines an interstice (27) with the blade (2),
   with a lateral recess (11) belonging to the interstice (27) and provided on the blade (2), said recess being defined by a guide face (29), which extends from the needle back (6) to the needle side face (12) and has at least one section (34) adjoining the needle side face (12) and one section (31) adjoining the needle back (6), said sections together enclosing an obtuse angle,
   characterised in that
   the obtuse angle enclosed between the section (34) adjoining the needle side face (12) and the section (31) adjoining the needle back (6) opens towards the transfer spring (15) so that the guide face (29) has a concave configuration overall.
2. Transfer needle according to Claim 1, characterised in that the recess (11) maintains such a space from the needle upper side (7) opposite the needle back (6) that a continuous loop support edge (14) is formed between the needle upper side (7) and the needle side face (12) also in the region of the recess (11).
3. Transfer needle according to Claim 1, characterised in that the guide face (29) is arched relative to the longitudinal direction (L) of the transfer needle (1).
4. Transfer needle according to Claim 1, characterised in that the guide face (29) is arched at least in sections relative to the direction (V) extending from the needle back (6) to the opposite needle upper side (7) essentially at right angles to the longitudinal direction (L).
5. Transfer needle according to Claim 4, characterised in that the arching follows a circular arc.
6. Transfer needle according to Claim 4, characterised in that the arching follows a parabola.
7. Transfer needle according to Claim 1, characterised in that the guide face (29) has at least one bending line (33), which preferably extends in the longitudinal direction.
8. Transfer needle according to Claim 1, characterised in that on the needle back (6) the guide face (29) encloses an angle with the direction (V), which is smaller than 20 degrees, and that on the needle side face (12) the guide face (29) encloses an angle with the direction (V), which is greater than 20 degrees.
9. Transfer needle according to Claim 8, characterised in that on the needle side face (12) the guide face (29) encloses an angle with the direction (V), which is greater than 25 degrees, preferably greater than 30 degrees.
10. Transfer needle according to Claim 1, characterised in that the recess (11) on the needle back (6) takes up more than half the width of the transfer needle (1).
11. Transfer needle according to Claim 7, characterised in that the transition of the guide face (29) from a first angle orientation to another angle orientation, determined by the bending line (33), is essentially arranged on a level with a lower edge (32) of the transfer spring (15).

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