EP2574581B1 - Suction nozzle for a workstation of a textile machine which produces crosswound bobbins - Google Patents

Description

The invention relates to a suction nozzle for a workstation of a cross-wound textile machine according to the preamble of claim 1.

In connection with the operation of cheese-producing textile machines, in particular automatic packages, it has long been common in the case of a winding interruption, for example, at a yarn break, in a controlled cleaner cut or at a supply bobbin change over a workstation computer to activate a working-own threading automatic.

That is, the workstation computer ensures that, as in the DE 40 05 752 A1 described, first a so-called suction nozzle with its suction port is applied to the surface of a slowly rotating against the winding direction of package and subjected to negative pressure.

The suction nozzle tries to take with its suction the yarn end of the upper thread pneumatically from the surface of the package designed as a cross-wound bobbin.

After detecting the upper thread end, the suction nozzle pivots back to its original position, in which the suction opening of the suction nozzle is positioned below a yarn splicing device.

The yarn strand extending between the cross-wound bobbin and the suction nozzle is guided into an electronic thread cleaner arranged above the yarn joining device, a yarn clamping device positioned in the region of the yarn joining device and, guided by corresponding guide contours of yarn guide plates and yarn guide bars, into the scissors a thread cutting device located below the splicing device retracted.

Almost at the same time as the suction nozzle, a gripper tube positioned in a lower starting position pivots into an upper working position, bringing with it a lower thread that has been held until then, for example in a thread tensioner, drawn from the supply spool.

When swinging the gripper tube in its upper working position of the lower thread, which is also performed on corresponding Fadenleitkonturen slides in an associated, open thread clamping device and in an also open thread cutting device.

The lower and upper threads are then cut to the correct length, prepared in so-called holding and Auflöseröhrchen and connected together in the Fadensleißeinrichtung. This means that at the workstations of a cheese winder, in order, for example, to be able to continue the operation automatically after a yarn breakage, both an upper thread taken back from the cheese and a bobbin thread coming from the supply bobbin are always required.

The above-described thread connecting devices and the associated suction nozzles and gripper tubes have proven in principle in practice and have been used in the textile industry for a long time in large quantities in use.

In the known suction nozzles, however, occasionally encounter difficulties in receiving a accumulated on the surface of the cheese spool end.

Such difficulties arise, in particular, when the yarn end accumulated on the cross-wound bobbin is relatively heavily infiltrated, and / or when a somewhat difficult, for example, particularly hairy yarn is present.

In order to assist the suction nozzles in the reception of such somewhat difficult to handle thread ends, has already been proposed in the past; In the area of the intake openings of the suction nozzles, comb strips are to be arranged, at which the sucked-in thread end is to be caught.

Suction nozzles with such comb strips in the region of their intake are known and, for example in the DE 10 2006 039 735 A1 , in the DE 10 2006 020 353 A1 or in the EP 0 398 415 A1 partly described in relative detail.

By the DE 10 2006 039 735 A1 For example, a suction nozzle is known, which has a particularly advantageous intake behavior due to the special design of its suction nozzle head. This advantageous suction nozzle is additionally equipped in the region of its intake opening with a comb strip which is arranged on the cover element of the suction nozzle head and has a row of adjacently arranged, equal-length teeth.

In the DE 10 2006 020 353 A1 is described a special mouthpiece of a suction nozzle. This known mouthpiece has, in the region of a suction opening, an angled pin-shaped strip produced by embossing, which is fixed by means of a so-called corner plate by means of hot-melt adhesive strips to a guide plate of the mouthpiece.

The DE 10 2006 020 353 A1 contains no further information regarding the exact formation of the pin strip.

By the EP 0 398 415 A1 Suction nozzles are also known, which are each equipped with a comb strip in the region of their intake. In the EP 0 398 415 A1 In addition, a method is described which explains the production of such comb strips.

According to this known method, a number of base plates, which in turn are already provided with fastening bores, are cut centrally by means of a laser cutting device so that the cutting lines have a comb-like course.

The resulting by the separation of the base plates sheet metal pieces, which now have in the region of the cutting edge each have a plurality of equal teeth, are then formed by repeated bending to Kämmleisten and this chemically trimmed to completion.

The by the EP 0 398 415 A1 Known comb strips, however, are not only relatively expensive in their production, but could not completely convince in practice.

Based on the aforementioned prior art, the present invention seeks to develop a suction nozzle with a comb strip, on the one hand is inexpensive to produce, and on the other hand, it is ensured that the accumulated on the cheese package thread end can always be reliably absorbed.

This object is achieved by a suction nozzle, as described in claim 1.

Advantageous embodiments of the suction nozzle according to the invention are the subject of the dependent claims.

The inventive production and training of the comb strip of a suction nozzle with an alternating arrangement of large and small teeth has the particular advantage that due to the set back arrangement of the small teeth accumulated on the surface of the cheese spool end of the upper thread initially detected only by the large teeth, relatively gentle is raised and then transferred over the legs of these large teeth to one of the small teeth.

The small, relatively sharp tooth grasps the thread end or the fibers projecting from the thread end and fixes the thread immediately.

The fixed in this way thread can then be easily handled by the slowly rotating in the unwinding cheese.

The inventive arrangement and design of the teeth, in particular the recessed arrangement of a small tooth between two large teeth, also has the advantage that the small teeth are in a largely protected from mechanical influences installation position, with the result that these teeth are very filigree could be.

Furthermore, it is ensured by the compared with Kämmleisten with equal teeth high tooth spacing between the large teeth that such a comb strip less quickly polluted than the usual comb strips.

As an advantageous method for producing the comb strips according to the invention, especially for the production of fine tooth geometry, the photochemical etching has been found.

In this known method photochemical processes are triggered with short-wave radiation, which lead to a very precise material removal at the exposed areas of a master material.

As set forth in claim 2, it is provided in an advantageous embodiment that the large teeth are arranged at a distance to each other which is between 0.5 and 1.0 mm, for example 0.7 mm.

Such a distance of the large teeth prevents on the one hand, that the comb strip can dirty too quickly, on the other hand is ensured by such a distance that the thread end can be reliably absorbed by the surface of the cheese.

With regard to the height of the teeth, advantageous conditions exist when the large teeth have a height between 0.5 and 0.8 mm, for example 0.7 mm, and the height of the small teeth is between 0.2 and 0.4 mm ( Anspr.3).

That is, according to experiments have shown that almost optimal conditions are given when the height of the small teeth is about half the height of the large teeth and the distance of the large teeth corresponds approximately to their height.

As described in claim 4, it is provided in a further advantageous embodiment that the acute angle of the small teeth is in each case between 10 ° and 30 °, preferably about 20 °.

Through such slender, small teeth especially difficult yarns, which are usually relatively hairy, are reliably detected.

As stated in claim 5, it is also provided in an advantageous embodiment that the comb strip is preferably made of a spring steel having a thickness of 0.2 to 0.5 mm.

Such a proven and commercially available spring steel is not only a proven, inexpensive material, but also has a sufficiently high strength even at low thickness.

The described in the claims of the invention Kammleiste a suction nozzle not only the performance of the suction nozzle is improved at the Fadenendaufnahme, but the comb strip according to the invention also ensures when swinging back the suction nozzle that, for example, loops that possibly present in the recorded thread are combed out, so that it is ensured that there is always only a single thread during the subsequent thread connection process.

The invention will be explained in more detail with reference to an embodiment shown in the drawings.

Fig. 1

schematisch eine Spulstelle einer Kreuzspulen herstellenden Textilmaschine, im Ausführungsbeispiel eines Kreuzspulautomaten, mit einer Saugdüse, die eine erfindungsgemäße Kammleiste aufweist,

Fig. 2

eine perspektivische Ansicht des Saugdüsenkopfes einer Saugdüse, die mit einer erfindungsgemäßen Kammleiste ausgestattet ist,

Fig. 3

eine Saugdüse mit einer erfindungsgemäßen Kammleiste in Vorderansicht,

Fig. 4

in einem größeren Maßstab eine Teilansicht auf die Zahnreihe einer erfindungsgemäßen Kammleiste.

It shows:

Fig. 1

schematically a winding unit of a cross-wound producing textile machine, in the embodiment of a cheese, with a suction nozzle having a comb strip according to the invention,

Fig. 2

a perspective view of the Saugdüsenkopfes a suction nozzle, which is equipped with a comb strip according to the invention,

Fig. 3

a suction nozzle with a comb strip according to the invention in front view,

Fig. 4

on a larger scale, a partial view of the row of teeth of a comb strip according to the invention.

In Fig. 1 is a side view schematically a job 2 of a cheese-producing textile machine, in the embodiment of a so-called cross-winding machine 1, shown. Such automatic packages 1 usually have a plurality of such, in series juxtaposed, identical jobs 2.

As is known and therefore not explained in detail, spinning workpieces 3 produced on ring spinning machines are rewound on workstations 2 into large-volume cheeses 5.

The cheeses 5 are after their completion by means of a (not shown) automatically operating service unit, preferably a cheese changer, handed over to a machine-length cheese package transport means 7 and transported to a machine end side Spulenverladestation or the like.

As shown in the exemplary embodiment, such automatic packages 1 often have a logistics device in the form of a package and tube transport system 6, in which spin cops 3 or empty tubes circulate on transport plates 11.

From this coil and sleeve transport system 6 are in the Fig. 1 only the Kopszuführstrecke 24, the reversibly driven storage section 25, one of the leading to the winding units 2 transverse transport sections 26 and the sleeve return path 27 shown.

Each job 2 of the automatic winder 1 also has various other, known per se and therefore not explained in more detail facilities that are necessary for proper operation of the jobs 2.

Each workstation 2 has, for example, a workstation computer 28, which is connected via a bus connection 29 to a central control unit 30 of the automatic cheese winder 1, and via a winding device 4, which has a coil frame 8 movably mounted about a pivot axis 12. As in Fig. 1 indicated lies during the winding operation in the creel 8 freely rotatably supported cheeses 5 with its surface on a support and drive roller 9, which is acted upon for example by an electric motor 33. The electric motor 33 is connected via a control line 35 to the workstation computer 28.

For traversing the thread 16 during the winding process a Fadenchangiereinrichtung 10 is provided, for example a finger thread guide 13 which, acted upon by an electric motor drive 14, traversing the thread 16 running on the cheese 5 between the end faces of the cheese 5 traversed. The yarn guide drive 14 is connected via a control line 15 to the workstation computer 28 in operative connection.

Such jobs 2 also have a thread connecting device 42, preferably a pneumatic splicing device, a gripper tube 43 for handling the lower thread and a suction nozzle 17, with a recorded after a Spulunterbrechung on the surface of the cheese 5 added thread end and inserted into the thread connecting device 42 can.

The suction nozzle 17 has, as for example with reference to FIG Figures 2 and 3 it can be seen, in the region of its suction nozzle head 18, a suction opening 23, which is equipped with a comb strip 19 according to the invention.

The exact design of the comb strip 19 according to the invention will be described below with reference to FIG FIGS. 3 and 4 explained in more detail.

The Figure 3 shows a front view of the suction head 18 of a suction nozzle 17th

The suction head 18 has a suction opening 23, in the upper region of which a comb strip 19 according to the invention is positioned. The comb strip 19 has a number of large teeth (20) and a number of small teeth (21).

That is, a small tooth (21) is positioned between each two spaced large teeth (20).

As in Figure 4 illustrated on an enlarged scale, the large teeth (20), the height (H) between 0.5 and 0.8 mm, preferably 0.7 mm, arranged at a distance (a) to each other, which is between 0.5 and 1.0 mm.

The small teeth (21) each arranged between two large teeth (20) have only a height (h) between 0.2 and 0.4 mm and an acute angle (α) which is between 10 ° and 30 °, preferably 20 °, lies.

This means that the tooth tips (31) of the small teeth (21) are set back clearly with respect to the tooth tips (22) of the large teeth (20) and are approximately halfway up the tooth base.

The comb strip (19) according to the invention is preferably made of a spring steel sheet having a thickness (t) between 0.2 and 0.5 mm.

As an advantageous manufacturing method for producing the comb strips according to the invention, the photochemical etching has been found.

With such a manufacturing method in which short-wave radiation photochemical processes are triggered, which lead to a very precise material removal at the exposed areas of the thin spring steel, especially fine tooth geometries can be produced inexpensively.

Claims (5)

1. Suction nozzle for a workstation of a textile machine producing cross-wound bobbins with a suction opening to pneumatically pick up a thread end that has run onto the surface of a cross-wound bobbin after a thread break or a controlled thread cut, the suction opening being equipped with a comb bar to fix the thread end that has been sucked up, characterised in that the comb bar (19) is produced by a photochemical etching method and has teeth (20 and 21), which have different heights, large teeth (20) with a height (H) alternating with small teeth (21) with a height (h).
2. Suction nozzle according to claim 1, characterised in that the large teeth (20) are in each case arranged at a spacing (a) with respect to one another, which is between 0.5 and 1.0 mm.
3. Suction nozzle according to claim 1, characterised in that the height (H) of the large teeth (20) is between 0.5 and 0.8 mm and the height (h) of the small teeth (21) is between 0.2 and 0.4 mm.
4. Suction nozzle according to claim 1, characterised in that the small teeth (21) have an acute angle (α), which is between 10° and 30°.
5. Suction nozzle according to claim 1, characterised in that the comb bar (19) is produced from spring steel, which has a thickness (t) of 0.2 to 0.5 mm.

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