EP1382729A1 - Latch needle - Google Patents

Abstract

A textile mesh knitting machine has a latch-type needle (1) with a shaft (2) bearing a hook (3) in the vicinity of a slit (5). The tongue is moved through the slit by a swivel-drive with a spring (19) resting against end supports (23, 24) in the slit. The spring (19) centre section (25) is esp. wider than the outer sections (26, 27). The two ends of the needle bear tabs which rest between spring seats (23, 24)

Description

The invention relates to a latch needle with the Features of the preamble of claim 1.

DE-AS 1113537 is a latch needle for stitch-forming Machines are known whose in a tongue slot pivotally mounted tongue with one in the tongue slot arranged leaf spring is in contact. The leaf spring is used to certain pivotal positions of the Tongue to set the type of locking positions.

The tongue spring is located on the tongue slot End of the tongue. Swings his tongue, rubs the end of the tongue on the tongue feather. It happens often to the wear of the tongue and the leaf spring, where appropriate, the leaf spring gradually buried in the end of the tongue. Due to this material wear, the undefined, one-sided and in places can take place, the leaf spring tends to Tilting, which negatively affects the functionality of the latch needle.

The tongue slot usually forms a passage, to the tongue as well as to the one facing away from it Side, the back of the needle, is open. The tongue feather however, largely closes this passage. In As a result, dust and flow, especially at the processing of hairy yarns, not without More can be done out of the tongue slot. Rather, impurities like to collect above the Tongue spring in the tongue slot and affect There, finally, the proper function of the latch needle.

On this basis, it is an object of the invention, a To create a latch needle, the overall functionally reliable is.

This object is achieved with the latch needle according to claim 1 solved:

The latch needle according to the invention has a special designed tongue spring, along its.Längserstreckung at least two areas with different Has width. It is for example as a leaf spring formed with rectangular, oval or round cross section, the cross section being over the length of the tongue spring can vary as needed. The tongue spring points a broader section, which is intended in particular is to form a contact surface for the tongue. Due to the increased area of wear can be reduced be that at the tongue end and the leaf spring occurs. In addition, the leaf spring is at the tongue end a flat complex, which tilting tendencies of the tongue feather counteracts.

On the other hand, the tongue spring has at least one second section in which they formed narrower is. This creates a gap-like passage between the Tongue spring and the adjacent diaphragm wall created. Through this passage can lint and abrasion from the Exit tongue slot. This will cause clogging of the Tongue slit largely prevented.

Due to the reduced wear, as a result of avoidance one-sided and only in places material removal on the tongue and the leaf spring and thus with the Avoidance of spring tipping Or lateral spring deflections and with the avoidance of flow accumulations in the Needle slot allows the functionality of the latch needle improve. This also applies and in particular at the processing of difficult, such as hairy or otherwise dust or abrasion-emitting yarns.

In a preferred embodiment, the tongue spring stored in their ends in spring seats or from this was added. Preferably, the ends have the tongue spring a corresponding to the tongue slot Width up. As a result, the tongue spring finds at their ends a flat edition in the spring seats, the tilt of a tilt the tongue tongue counteracts. It can do that especially arrive when the cross section of the tongue spring in the area of lesser width to achieve a sufficient spring hardness is compressed laterally, i.e. when the tongue spring in this area parallel to Tongue slot wall measured has a height that so is large or larger than its width.

The inventive design of the tongue spring with at least two sections that are a different one Have width, can be applied to both embodiments in which the tongue spring is straight, i. stretched is formed, as well as in embodiments, where the tongue spring has one or more bends having. In both cases, the tongue is preferably in the Broadened area of the tongue bearing device, so that with little play between the almost flat ones Tongue slot walls sits. The tongue feather has this a good cornering, i. she is centered in that Tongue slot held. (The width of the tongue spring is across the tongue slot, i. approximately parallel to the journal bearing journal measured.)

Following the area of the tongue bearing points the tongue tongue sections with preferably reduced Width up. As a result, to both sides of the tongue bearing device in each case a large part of the cross section of the Tongue slot for the passage of lint or other Keep contaminations free. Preferably extends The narrower portion of the tongue spring from the tongue bearing device up to the spring seats.

The wider section of the tongue feather, which is about arranged centrally in the region of the tongue bearing device is preferably sized in terms of its length, that no narrower spring area with the end of the tongue can come into contact. This means that the entire area or section of the tongue spring, the can come into contact with the tongue, almost the entire Slot width occupies. As a result, on the one hand the Tongue wear and possibly also the spring wear and a tilting tendency of the tongue spring minimizes while on the other hand a possible free passage of lint, abrasion and dust through the tongue slot on the tongue feather is ensured.

In a preferred embodiment, the width is tongue tongue in the section of reduced width, lower as half the slot width. Preferably less than one third of the slot width. Thereby a particularly free passage is achieved.

The tongue spring is preferably with respect to her Longitudinal axis formed symmetrically. It is the narrower Section of the tongue spring by two on both flanks the tongue tongue provided recesses formed. Such a spring has a particularly low tendency to tilt on. However, it is also possible the tongue feather asymmetric form. In this case, the tongue spring respectively have only on one side a recess. The recesses in front of and behind the tongue bearing device can do this on different sides of the tongue spring be provided to balance the spring in terms of power. This embodiment has the advantage particularly continue and free dirt or flow passages for themselves.

Further details are the subject of the drawing, the description or subclaims.

Figur 1

eine Zungennadel in ausschnittsweiser, teilweise aufgeschnittener Darstellung,

Figur 2

die Zungennadel nach Figur 1 ohne Zunge in Draufsicht,

Figur 3 bis 5

abgewandelte Ausführungsformen der Zungennadel nach Figur 1 ohne Zunge in Draufsicht und

Figur 6

eine abgewandelte Ausführungsform der Zungennadel in teilweise aufgeschnittener Seitenansicht.

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

FIG. 1

a latch needle in fragmentary, partially cutaway representation,

FIG. 2

the latch needle of Figure 1 without tongue in plan view,

FIGS. 3 to 5

modified embodiments of the latch needle of Figure 1 without tongue in plan view and

FIG. 6

a modified embodiment of the latch needle in a partially cutaway side view.

In Figure 1 is a latch needle 1 with its shaft 2, her designated hook 3 and her tongue. 4 illustrated. The shaft 2 has a tongue slot 5 on whose slot walls 6, 7, as shown in Figure 2, on mutually facing flat inner surfaces 8, 9 exhibit. The tongue slot 5 forms a passage, the at both the Nadelbrust 11 and the Nadelrükken 12 opens.

The tongue 4, with her spoon 14 in a first Position against the top of the hook 3 and in one second position pivoted maximum of the hook 3 away can be extends with her tongue end 15 in the tongue slot 5 inside. Extends through this transverse to the shaft 2, a bearing pin 16, the Tongue end 15 passes through a tongue hole 17. The tongue end 15 with the tongue hole 17 and the journals 16 form a tongue bearing device 18, the serves as a pivot bearing for the tongue 4.

In the tongue slot 5 a tongue spring 19 is arranged, which bears against the tongue 4 and as a leaf spring is trained. She supports herself with both ends 21, 22 in spring seats 23, 24 from that in the tongue slot with respect to the longitudinal direction L of the shaft 2 in front and behind the tongue bearing device 18 are formed. The spring seats 23, 24 are corresponding pockets or recesses for receiving the ends 21, 22 with low axial and with little lateral play. You can, for example have the same width as the tongue slot 5th

The peculiarity of the tongue needle 1 consists in the Formation of the tongue spring 19, based on the Lengthwise L, in new, unused condition none has constant width. Rather, the width is in one first section 25, which is below the storage facility 18 is arranged larger than in at least one second section 26, 27 extending from the storage facility 18 way away. The first section 25 is the one Area that the tongue 4 during its pivoting movement reach or touch. The second section 26 or 27 is one which the tongue 4 in this embodiment can not touch in any pivotal position.

The formation of the tongue spring 19 is in particular from FIG. In this embodiment goes the tongue spring 19 of a rectangular outline, for example from a corresponding blank from a flat spring steel. It points in the area of its ends 21, 22 each have lateral edges on each side the tongue spring 19 lie on a common line. The two sides of the tongue spring 19 are parallel to each other. They are also parallel to the inner surfaces 8, 9 of the slot walls 6, 7. As can be seen from Figure 2, is the width of the tongue spring 19 is slightly smaller than that clear width of the tongue slot 5. This is the approximately centrally arranged portion 25 of the tongue spring 19 with little game held in the tongue slot 5. He can itself (in Figure 1 vertically and in Figure 2 perpendicular to Drawing plane) freely move in the tongue slot 5, without that its flanks on the inner surfaces 8, 9 of the tongue slot 5 rub. However, section 25 of the Tongue 19 shift very little laterally, i. the inner surfaces 8, 9 center or guide the tongue spring 19 in its section 25.

The ends 21, 22 preferably have the same Width on, as the section 25. They are thus also for centering the tongue spring 19 in the tongue slot 5. You are preferably sitting with some axial play in their spring seats 23, 24.

The tongue spring 19 has in the section 26 as well in the section 27 a smaller width than in the Section 25. In addition, the tongue spring 19 in the section 26 on both sides each with an elongated Recess 28, 29 provided, each by a straight Edge 31, 32 is limited and in one step to each subsequent section, i. the end 21 or the Area 25 passes. The edges 31, 32 are parallel to each other arranged and straight. The recesses 28, 29 thus form passages for dirt or Flus.

Corresponding recesses 33, 34 are in the tongue spring formed in the section 27. Also these recesses let, as already the recesses 28, 29, from the spring 19 are a central (central) bridge, which is bounded parallelflankig and with the inner walls 8, 9 each limited to a passage slot.

In the present embodiment, the Tongue 19 has a rectangular cross section. The perpendicular to the flat side of the tongue spring 19 in Figure 1 measured vertically and in Figure 2 perpendicular to the plane Thickness of the tongue spring 19 is both in the range of its Webs (section 26, 27) and at the ends 21, 22 as also in section 25 constant. Concentrated the bending of the tongue spring 19 on the sections 26, 27 while the section 25 rather than relatively rigid Plate can be viewed. The tongue spring 19 is however formed in one piece as a whole. To avoid Stress cracks or other damage can affect the transitions between sections 26 and 27 to the section 25 be rounded in each case.

The tongue needle 1 described so far works as follows:

In operation, the latch needle 1 leads in the direction L held back and forth movement. As part of this movement, the tongue 4 performs a pivoting movement in the course of which the tongue 4 at the top of Hook 3 comes to the plant, as well as completely pivoted in reserve becomes. In the latter, the spoon 14 has the maximum Distance from the hook 3. At times come flat spots 35, 36 of the tongue 4 with the portion 25 of the tongue spring 19 in touch to the tongue in the concerned To hold intermediate position compliant.

When swinging back and forth the tongue 4 that rubs Tongue end 15 on the tongue spring 19. It lies However, no edge of the tongue spring 19 on the tongue 4 at. Rather, the thickness of the tongue 4 is approximately equal to the width of the section 25 of the tongue spring 19 match. Even if the tongue in operation tilts slightly or pivots sideways or if the outer surface at the end of the tongue 15 the young 4 is not quite parallel to the axis of the Pin 6, the tongue spring 19 can not laterally dodge, because the area 25 centers them in the tongue slot 5th

In operation, filament fragments, dust, Abrasion or the like, can get into the tongue slot 5. He does not have to accumulate here. The at the recesses 28, 29, 33, 34 existing passages allow the dust and filaments on the tongue spring 19 over to the needle back 12 out of the tongue slot 5 be dismissed.

A modified embodiment of the latch needle. 1 has according to Figure 3, a tongue spring 19, the recesses 28, 29, 33, 34 are designed deeper, so that from the tongue spring 19 remaining webs 37, 38 narrower are as one third of the width of the tongue slot 5. Also the webs 37, 38 are not parallel-shaped here, but something waisted. The recesses 28, 29, 33, 34 are approximately trapezoidal, with their long, the Web 37, 38 bounding edge is slightly curved is. The webs 37, 38 each have their center approximately thinnest spot on. The transitions to the ends 21, 22 as well may also be rounded to the area 25.

This embodiment offers particularly large passages for fluff, dust or other impurities, which are to be discharged to the needle back 12 out.

While the tongue springs 19 of the embodiments Figures 2 and 3 respectively with respect to their longitudinal axis FIG. 4 illustrates a symmetrical design with respect to the longitudinal direction asymmetric embodiment. This is in section 26 as well as in the section 27 only one recess 29, 33 provided, these being on opposite sides of the tongue spring 19 are arranged. In the embodiment, the remaining Webs 37, 38 narrower than half the width of the Tongue slot 5. You can also use the same thickness as in section 25. If necessary the webs 37, 38 also have slightly larger thicknesses than the ends 21, 22 and section 25. The same applies for the embodiment of Figure 2 and in particular the embodiment of Figure 3. Thereby at maximum passage area in the region of the recesses 29, 33, i. with minimum width of the webs 37, 38, a high spring stiffness can be achieved. A Pivoting or tilting tendency of the tongue spring 19, however by the planar arrangement of the same with their ends 21, 22 in the spring seats 23, 24 and by the surface conditioning prevented at the end of the tongue.

As Figure 5 illustrated, in another Embodiment of the tongue spring 19 also on a wide Training their ends 21, 22 are omitted. It is possible, the webs 37, 38 with the same width let the ends 21, 22 leak out. In this embodiment the spring seats 23, 24 have a narrowed Taper on so that the ends 21, 22 are centered here are held. The central centering of the tongue spring 19th again, in turn, results from the wide education the tongue spring 19 in the section 25th

The section 25 is preferably a central section, the tongue spring 19, which at both ends 21,22 is stored. Its length is preferably slightly larger as the area in contact with the tongue 4. This also applies to the exemplary embodiment according to FIG. 6, in which the tongue spring 19 in contrast to the embodiment is formed cranked according to FIG. in the Section 25 of the tongue support device 18 has the Tongue 19 has such a width that it transversely extends through the entire tongue slot 5 and in the tongue slot 5 can move without jamming. Outside However, in Section 25, it is rejuvenated or through corresponding recesses of Figure 2 to 5 narrower designed. In this embodiment (Figure 6) it can be advantageous, the area 26 or the area 27th or divide both areas 26, 27. Within the Recesses 28, 29, 33, 34 (Fig. 2) are then on the Tongue spring 19 extending to the inner surfaces 8, 9 Developed extensions that can serve the centering or form a support for the tongue 4.

As far as the embodiments of Figure 3 to 6 no separate instructions are given, the description applies the latch needle 1 according to Figures 1 and 2 based on the same reference numerals.

A latch needle 1 has a tongue spring 19, the near the tongue bearing 18 the width of the tongue slot 5 occupies. On both sides of this section 25, the tongue spring 19 is formed narrower. This is on the one hand a premature tongues or Spring wear in the area of the tongue bearing device 18 as well as a blockage of the tongue slot 5 counteracted by dust or dirt. The narrower ones Sections 26, 27 of the tongue spring 19 limit with the inside 8, 9 of the slot walls 6, 7 a passage, through the foreign body such as fiber remnants, dust or the like from the needle top 11 to the needle back 12 can be promoted. Needles 1 of this type have a reduced compared to conventional latch needles Wear, a reduced susceptibility to soiling and thus increased reliability.

LIST OF REFERENCE NUMBERS

1

latch needle

2

shaft

3

hook

4

tongue

5

latch slot

6, 7

Diaphragm walls

8, 9

inner surfaces

11

needle breast

12

needle back

14

spoon

15

Latch shank end

16

pivot

17

latch hole

18

Tongue storage facility

19

latch spring

21, 22

end up

23, 24

spring seat

25, 26, 27

Area

28, 29

recess

31, 32

edge

33, 34

recesses

35, 36

flats

37, 38

Stege

L

longitudinal direction

Claims (15)

Latch needle (1) for meshing machines,
with a shaft (2) carrying a hook (3) in the vicinity of which a tongue slot (5) is formed,
with a tongue (4) which is pivotally mounted in the tongue slot (5) on a tongue bearing device (18),
with a tongue spring (19) which is arranged in the tongue slot (5) and held on spring seats (23, 24),
characterized in that the tongue spring (19) in a first portion (25) has a width which is greater than in a second portion (26 or 27). Latch needle according to claim 1, characterized in that the tongue spring (19) is mounted at its two ends (21, 22) in spring seats (23, 24). Latch needle according to claim 1, characterized in that the tongue spring (19) is straight. Latch needle according to claim 1, characterized in that the tongue spring (19) is formed cranked. Latch needle according to claim 1, characterized in that the first portion (25) on the tongue bearing means (18) is arranged. Latch needle according to claim 1, characterized in that the second portion (26 or 27) is arranged at a location spaced from the tongue bearing means (18). Latch needle according to claim 1, characterized in that in the spring longitudinal direction (L) measured length of the first portion (25) detects the entire with the tongue (4) coming into contact region of the reed spring (19). Latch needle according to Claim 1, characterized in that the length of the second section (26) measured in the spring longitudinal direction (L) occupies the entire area (26) present between the latching device (18) and the spring seat (23, 24). Latch needle according to claim 1, characterized in that the tongue spring (19) is symmetrical. Latch needle according to claim 1, characterized in that the tongue spring (19) is asymmetrical. Latch needle according to claim 1, characterized in that the width of the tongue spring (19) in its first portion (25) is at least as large as the width of the tongue (4). Latch needle according to claim 1, characterized in that the width of the tongue spring. (19) in its second section (26) is less than half the width of the tongue slot (5) Latch needle according to claim 1, characterized in that the width of the tongue spring (19) in its second portion (26) is less than one third of the width of the tongue slot (5). Latch needle according to claim 1, characterized in that with respect to the longitudinal direction (L) of the tongue spring (19) on both sides of the tongue bearing (18) second portions (26, 27) are present, in which the tongue spring (19) is formed with a smaller width as in the first portion (25) disposed on the tongue bearing means (18). Latch needle according to claim 1, characterized in that with respect to the longitudinal direction (L) of the tongue spring (19) on at least one side of the tongue bearing (18) a divided second portion (26 or 27) is present.

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