WO2008058605A1

WO2008058605A1 - Cross-winding device for a textile machine which produces cross-wound bobbins

Info

Publication number: WO2008058605A1
Application number: PCT/EP2007/009074
Authority: WO
Inventors: Sven Butschko
Original assignee: Oerlikon Textile Gmbh & Co. Kg
Priority date: 2006-11-11
Filing date: 2007-10-19
Publication date: 2008-05-22
Also published as: EP2106378B1; CN101535159B; ATE467600T1; DE502007003806D1; DE102006053135A1; EP2106378A1; CN101535159A

Abstract

The invention relates to a cross-winding device (20) for a textile machine (1) which produces cross-wound bobbins and which has numerous operating positions (4), and which has a thread carrier rod (13) extending in a longitudinal direction relative to the machine and actuated in a traverse direction and on which cross-winding thread guides (12) are fixed. The cross-winding device (20) is also equipped with a so-called edge transferring device (18) which ensures that the cross-winding thread guides (12) run up to both inner (21) and outer (22) reversal points. In addition, the cross-winding device (20) has at least one energy storage unit (30) which supports the change of direction of the thread carrier rod (13) in the area of the reversal points (21, 22). According to the invention, it is provided that driver elements (31) are arranged on the thread carrier rod (13) which work together alternately in the cross-winding end areas thereof with a mechanical stop (32) of a spring system (33) which is formed as an energy storing unit (30). Said spring system (33) has at least two prestressed spring elements (34A, 34B) which lie on opposite sides of the mechanical stop (32) and which are formed and positioned such that the spring system (33), originating from a fulcrum (M) and going toward both sides, has for each side a decreasing spring characteristic (45, 46).

Description

Description :

Fadenchangiervorrichtung for a cross-wound producing textile machine

The invention relates to a Fadenchangiervorrichtung for a cross-wound producing textile machine according to the preamble of claim 1.

Especially in the context of open-end rotor spinning machines Fadenchangiervorrichtungen with traversing yarn guides, which are fixed to machine-length yarn guide rods, has long been known and described in detail in numerous patents, such as US Patent 6,027,065, as well as in various manuals of textile machinery manufacturers. Such, for example, also described in the manual AUTOCORO Fa. Schlafhörst on page 1.2.5 Fadenchangiervorrichtungen usually have a machine end side arranged traversing gear, for example in the form of a grooved cylinder roller, which is rotated by an electric motor drive.

To this cylinder roller machine-length thread guide rods are connected via corresponding lever linkage so that each time the cylinder cam turns the thread guide rods each perform a double stroke.

In such trained Fadenchangiervorrichtungen occur in the reversal of the direction of movement of the yarn guide rods each highest tensile and compressive loads, which lead to delays in reversing the direction of movement and shifts of the reversal points, especially in long textile machines on the side facing away from the traversing drive. It has therefore been proposed to arrange additional energy storage on the yarn guide rods of such Fadenchangiervorrichtungen that support the direction of movement reversal of the yarn guide rods.

In the US-PS 6 027 065 or in DE 21 30 718 A Fadenchangiervorrichtungen are described, the yarn guide rods are equipped at their opposite end of the traversing drive each with a defined controllable, pneumatic energy storage. The Fadenchangiervorrichtung according to US-PS 6,027,065 can be equipped in addition to the pneumatic energy storage with a mechanical energy storage in the form of spring elements acting as impact springs against which the yarn guide rod starts.

Since the yarn guides are initially delayed in the region of their reversal points, that is to say in the area of the coil edges of the cheese and accelerated again after the reversal of the direction of movement, the yarn is not deflected in a sharp-edged manner, but instead a more or less flat reversal arc of the deposited yarn results.

This reverse bend leads in the edge zones of the cheeses, if no special measures are taken, to accumulations of material that significantly affect, for example, the flow behavior of such cheeses.

Also, in other subsequent operations, for example, when dyeing such coils, such material accumulations would have the most negative impact.

To avoid such accumulations of material in the edge zones of a cross-wound bobbin, it is therefore customary to work with a so-called edge-laying device. In such an edge-laying device, the traversing movement of the yarn guide rods is superimposed with a second movement, as described for example in the manual AUTOCORO Fa. Schlafhörst on page 1.2.12.

As described, for example, in DE 100 21 963 A1, the edge laying results in the thread running onto the surface of the cross-wound bobbin being distributed over a wider area, ie, at and between the inner and outer, when the direction of movement of the thread guide is reversed Reversal points is filed.

The inner and outer reversal points of the thread guide can be, for example, 5 mm apart.

Based on the aforementioned prior art, the present invention seeks to provide a Fadenchangiervorrichtung, which makes it possible to minimize the thread tension rods occurring at each direction of movement reversal high tensile and compressive loads cost-effectively and reliably.

This object is achieved by a Fadenchangiervorrichtung having the features described in claim 1.

Advantageous embodiments of the invention are the subject of the dependent claims.

The embodiment of the invention, in which are arranged on the yarn guide rod of Fadenchangiervorrichtung drivers, which correspond to a designed as an energy storage spring system, wherein the spring system has at least two prestressed spring elements and a stop disposed therebetween, provides in a simple way Possibility to sufficiently compensate for the kinetic energy of the yarn guide rod both in the area of the inner and in the area of the outer reversal points, that is to immediately convert the braking energy into acceleration energy. The inventive design of the spring system with a degressive spring characteristic ensures that on the one hand in the region of the inner reversal points already sufficient compensation of the kinetic energy of the yarn guide rod is ensured and that on the other hand in the area of the outer reversal points ensures that no overcompensation of the kinetic energy of the yarn guide rod takes place.

That is, in a deflection of the stopper by one of the arranged on the thread guide rod driver automatically comes to a discharge of one of the prestressed spring elements and a greater load on the opposite spring element with the result that the spring stiffness of the spring system to a point at one of the spring element is completely relaxed again, first doubled.

Following this, only the other spring element is acted upon and further tensioned.

The spring stiffness of the spring system then corresponds to the spring stiffness of the coil spring used, with the result that the spring characteristic of the spring system now runs much flatter.

As described in claim 2, it is provided in an advantageous embodiment of the invention that the spring elements of the spring system are designed as helical compression springs. Such helical compression springs are proven and cost-effective mass-produced components whose exact dimensions and properties, for example, DIN 2098 can be removed. Such helical compression springs have, inter alia, the advantages that they build relatively small and that with them a sufficiently long travel is to be realized.

In addition, the internal friction of these components is relatively low, so that such helical compression springs release a large part of the absorbed energy again.

As explained in claims 3-5, the spring system constructed as an energy store has an overall degressive spring characteristic with a first linearly steeper section and a second linearly flatter section (claim 3).

That is, the spring system has a first section in which the spring characteristic initially rises relatively steep and a subsequent, second section with a likewise linear, but much less sharply rising spring characteristic.

Preferably, the spring characteristic on the first portion extends at an angle which is about twice as large as the angle of the spring characteristic on the second portion of the spring characteristic of the spring system.

The transition point between the steeper and the flatter

Section of the spring characteristic of the spring system is there, as in

Claim 4, arranged so that it corresponds to the position of the arranged on the thread guide rod traversing yarn guide at the inner reversal point.

This ensures that, on the one hand, already in the

Range of inner reversal points sufficient kinetic energy can be compensated and on the other hand is avoided in the

Area between the inner and outer reversal points takes place too much compensation of kinetic energy. The exact slope of the spring characteristic and thus the strength of the compensation of the kinetic energy in the area at and between the inner and outer reversal points can be adjusted by the size and design of the helical compression springs and the bias of the spring elements during assembly of the energy storage.

As described in claim 5, the transition point of the spring characteristics of the spring system on the bias of these spring elements is adjustable in a relatively simple manner. As already explained above, the slope of the spring characteristic of the spring system before the transition point is about twice as high as the steepness of the spring characteristic of the spring system behind the transition point in an advantageous embodiment due to the bias of the spring elements.

As described in claim 6, it is provided in an advantageous embodiment of the Fadenchangiervorrichtung that designed as an energy storage spring system has a holder for setting a in the installed state of the energy storage parallel to the yarn guide rod arranged guide pin. At this guide pin, a guide slide is slidably mounted, which has a stop for the arranged on the thread guide rod driver.

In addition, on this guide pin, the biased spring elements are arranged, which are positioned so that the stop, when it is not acted upon by the driver, is centered in a central position of the spring system. That is, without additional external loading, the preloaded spring elements first neutralize in the middle of the spring system. Such a trained spring system allows in conjunction with the arranged on the thread guide rod drivers in a cost-effective manner, a compensation of the kinetic energy occurring during the thread laying in the region of the reversal points on the yarn guide rod.

In particular, the arrangement of prestressed spring elements ensures that in the area of the inner reversal points, in the area between the reversal points and in the area of the outer reversal points, helpful compensating forces of comparable magnitude become effective.

As described in claim 7, preferably, each textile machine on more of the spring systems according to the invention, each of which can optionally be put into operation. That is, depending on the respective traversing speed of the yarn guide rods, which may arise, for example, from the material to be processed, either all spring systems of the textile machine or even a part of the spring systems can be used simultaneously. Due to the number of spring systems used, an optimal adaptation of the strength of the compensation of the kinetic energy in the direction reversal of the yarn guide rod can be realized in a simple manner.

According to claim 8, the spring systems according to the invention are preferably each in the region of the section boundaries of

Textile machine arranged.

That is, the textile machine has each according to their

Machine length a certain number of spring systems.

With such a design, it is ensured that the number of existing spring systems is adapted to the length of the textile machine and thus to the length of the thread guide rod, from which the size of the kinetic energy to be compensated results. By such an advantageous embodiment it is achieved that even with very long textile machines with the high traversing speed of the thread guide can be worked, which has a positive effect on the efficiency of such cheesemakers producing textile machine.

As set forth in claims 9 and 10, the spring systems are preferably designed so that either the holder of the spring system is pivotally mounted, so that the spring system can be taken in total out of the range of action arranged on the thread guide rod driver, or between the prestressed spring elements positioned stop is limited rotatably mounted and can be pivoted out of the work area of the driver.

In both cases it is very easy to switch on a spring system or to take it out of service.

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

Show it:

Fig.l in front view a cheesemaking producing

Textile machine with a plurality of workstations and a Fadenchangiervorrichtung, which is equipped with the spring systems according to the invention,

2 shows in front view and on a larger scale a spring system according to the invention, which is arranged in the region of a section boundary of the textile machine,

3 is a perspective view of a spring system according to the invention, 4 shows a diagram with the course of the spring force of the spring system according to the invention in relation to the spring travel.

FIG. 1 shows a front view of a textile machine producing cross-cheeses, in the exemplary embodiment an open-end rotor spinning machine 1. Such textile machines 1 usually have end frames 2, 3 and a plurality of jobs 4, which are arranged between these end frames 2, 3. The individual workstations 4 are arranged in sections, that is, for example, twenty-four workstations 4 (twelve on the machine front and twelve on the back of the machine) form a machine section 24. The machine sections 24 are each mounted in the region of their section boundaries 23 on machine stands 39.

Each of the jobs 4 has an open-end spinning device 6 and a winding device 5, wherein in the spinning device 6, a sliver 8, which is held in sliver cans 7, is converted into a thread 9, which is then wound on the winding device 5 to form a cheese 10 becomes.

The cross-wound bobbin 10 is rotatably supported in a (not shown) creel and is rotated by means of a drive roller 11, which acts on the cross-wound bobbin 10 frictionally.

The thread 9 is also traversed by a traversing yarn guide 12 during emergence on the cheese 10, that is, the thread 9 is placed in intersecting layers on the cheese 10.

The traversing thread guides 12 of all jobs 5 a machine side of the textile machine are doing to one set common thread guide rod 13 which is supported in the area of jobs 4 in (not shown) storage facilities and machine end side is connected to a traction drive 14.

The integrated, for example, in the end frame 2 traversing drive 14 has, for example, a grooved drum 15, which is rotatable by means of an electric motor 16.

To the grooved drum 15, the thread guide rods 13 of the two sides of the machine are connected via corresponding lever linkage.

Furthermore, a (schematically indicated) edge laying device 18 is arranged in the end frame 2, which ensures that accumulation of material in the area of the cross-coil edges can not occur during the winding process. As further illustrated in FIG. 1, in the region of the section boundaries 23 of the open-end spinning machine 1 energy stores 30 are also arranged, which according to the invention are designed as spring systems 33 and are explained in more detail below, in particular with reference to FIGS. 2 to 4.

FIG. 2 shows, in a front view and on a larger scale, two work stations 4 arranged in the region of a section boundary 23, each of which belongs to adjacent machine sections 24 of the textile machine 1.

As indicated in FIG. 2, each of the work stations 4 has an open-end spinning device 6, which processes a sliver 8 into a yarn 9, which is then wound on a winding device 5 to form a cross-wound bobbin 10. The cheese 10 is rotated for this purpose by a rotating in the direction of arrow R drive roller 11 via frictional engagement and trailing yarn 9 traversed by the total designated by the reference numeral 20 Fadenchangiereinrichtung in the direction of the double arrow VZ. As can be seen, the individual traversing thread guides 12 of the thread-changing device 20 are connected to a common, machine-length thread guide rod 13, which is acted upon by a traversing mechanism 14 and a per se known and in Fig. 1 only schematically indicated edge laying device 18.

That is, during the spool travel, the traversing yarn guides 12 are constantly traversed between the flanks of the cheese 5, as is strongly indicated in Fig. 2 by means of a curve 51.

The reversal of movement of the traversing yarn guide 12 takes place, as is known, alternately at inner or outer reversal points or the direction of movement reversal takes place alternately in the lying between the inner and outer reversal points areas.

As shown in Fig. 2, the outer reversal points (22) are in the region of the cheese spider edges, while the inner reversal points (21) are offset slightly to the coil center.

In the region of the section boundaries 23, in each case mechanical energy stores 30 are arranged on machine stands 39, for example, limitedly movable about a pivot axis 40. These energy stores 30 are, as shown particularly in FIG. 3, preferably designed as a spring system 33. That is, each energy storage 30 each consists of a holder 36 in which a guide pin 37 is fixed, which is arranged in the assembled state of the energy storage 30 parallel to the yarn guide rod 13 of the textile machine 1.

On the guide pin 37, a guide slide 38 is axially displaceably guided, which is equipped with a stop 32. The guide carriage 38 is biased on both sides by biased spring elements 34A and 34B, which are also mounted on the guide pin 37.

Without additional external loading position the spring elements 34 A, 34 B, which are supported on vertical wall portions of the holder 36, the stop 32 in a neutral center position M of the spring system 33rd

During the winding operation, the stopper 32 is alternately acted upon by drivers 31 which are fixed on the yarn guide rod 13.

That is, when the traversing yarn guide 12 comes on the way to the spool edge in the region of an inner reversal point 21, one of the arranged on the thread guide rod 13 driver 31 abuts against the stop 32 of the spring system 33.

The arranged on the guide carriage 38 stop 32 is displaced axially on the guide pin 37, resulting in that one of the prestressed spring elements, for example, the spring element 34A is compressed, while the other spring element 34B expands simultaneously.

The arrangement and design of the spring elements 34A, 34B of the spring system 33 are chosen so that the spring system 33, as indicated in Fig. 4 by a diagram, a total of a degressive spring characteristic, which is formed by the spring characteristic sections 45 and 46. In Fig. 4 are on the abscissa of the spring travel W of the spring element 34A, 34B registered on the ordinate by the spring element 34A, 34B on the stop 32 and on the driver (31) acting on the yarn guide rod spring force F.

As indicated in the diagram of Fig. 4, keep the neutralizing spring forces of the prestressed, against each other acting spring elements 34A, 34B, the stop 32 in the middle M of the spring system.

The spring travel of the prestressed spring elements 34A, 34B is in

Points M each a.

When the stop 32 is displaced, for example in the direction of the spring element 34A, the spring element 34A is continuously tensioned while at the same time the spring element 34B is continuously being relaxed.

The arrangement of the spring elements 34A and 34B is chosen so that when the traversing yarn guide 12 the inner

Reversal point 21 has reached, the spring element 34 B is completely relaxed and the spring element 34 A in addition to the

Travel b was compressed.

The at this displacement of the stop 32 in the spring system

33 between the points M and 21 (= travel b) resulting

Power / travel ratios are shown in Figure 4 by the spring characteristic 45.

In the further displacement of the stop 32 to the outside, that is, on the way forward of the traversing yarn guide 12 to an outer reversal point 22, the stopper 32 is then acted upon only by the spring force of the spring element 34A, as shown in FIG Spring characteristic 46 is illustrated. The spring travel of the spring element 34A in this area is indicated by c.

The transition point between the spring characteristic sections 45, 46 is indicated by reference numeral 50; this transition point 46 is in the range of the inner turning points 21. As further seen, the portion 46 of the spring characteristic of the spring system 33, the steepness of which results from the design of the helical compression spring used, in the region of the spring travel c, ie between the inner reversal point 21 and the outer reversal point 22 of the traversing yarn guide 12 a significantly flatter course, as the section 45 of Spring characteristic in the region between the center position M of the stop 32 and the transition point 50.

The spring system 33 according to the invention therefore has a total of the degressive course of the spring characteristic 45, 46 shown in FIG. 4.

That is, to the inner reversal points 21 of the traversing yarn guide 12 towards the spring force, which is necessary to compensate for the kinetic energy of the yarn guide rod 13 in connection with the direction reversal of this component, initially relatively strong, then to the outer reversal points 22 out only to increase less.

Such a degressive course of the spring characteristic curve 45, 46 of the spring system 33 according to the invention has the result that conditions are present both in the area of the inner reversal points 21 and the outer reversal points 22 and in the areas lying between the reversal points with respect to the spring forces of the energy accumulator 30, which ensure at each point a good compensation of the kinetic energy of the yarn guide rod 13 in the direction of movement reversal.

Claims

Claims:

A thread-feeding device (20) for a cross-wound textile machine (1) having a plurality of jobs (4), with a machine-longitudinal direction, traversing driven yarn guide rod (13) are fixed to the traversing yarn guide (12), with a so-called edge-laying device (18), which ensures that the traversing yarn guides (12) start both inner (21) and outer (22) reversal points and with at least one energy store (30), the change in direction of the yarn guide rod (13) in the region of Reversal points (21, 22) supported,

characterized,

that on the thread guide rod (13) drivers (31) are arranged, which interact alternately in the traversing areas with a stop (32) designed as an energy storage (30) spring system (33) that the spring system (33) at least two prestressed spring elements (34A , 34B), which rest on opposite sides on the stop (32) whereby the spring system (33) starting from a rest point (M) on both sides in each case a degressive spring characteristic (45, 46).

2. Fadenchangiervorrichtung according to claim 1, characterized in that the spring elements (34 A, 34 B) are formed as helical compression springs.

3. Fadenchangiervorrichtung according to claim 1, characterized in that the degressive spring characteristic of the spring system (33) each consist of a linearly steeper portion (45) and a subsequent linear flatter section (46).

4. Fadenchangiervorrichtung according to claim 3, characterized in that the transition point (50) between steeper and flatter spring characteristic (45, 46) is arranged so that it the position of the thread guide rod (13) arranged traversing yarn guide (12) at the inner reversal point ( 21).

5. Fadenchangiervorrichtung according to claim 3 or 4, characterized in that the transition point (50) between steeper and flatter spring characteristic (45, 46) by changing the bias of the spring elements (34A, 34B) is adjustable.

6. Fadenchangiervorrichtung according to claim 1, characterized in that the spring system (33) has a holder (36) for receiving a parallel to the yarn guide rod in the operating state (13) guide pin (37), one on the guide pin (37) slidably guided, with the Stop (32) equipped guide carriage (38) and on both sides of the stop (32) on the guide pin (37) arranged, prestressed spring elements (34A, 34B).

7. Fadenchangiervorrichtung according to claim 1, characterized in that the textile machine (1) along the yarn guide rod (13) is equipped with a plurality of spring systems (33), wherein the individual spring systems (33) are selectively connectable.

8. Fadenchangiervorrichtung according to claim 7, characterized in that the spring systems (33) respectively in the region of the section boundaries (23) of the machine sections (24) of the cheese-producing textile machine (1) are arranged.

9. Fadenchangiervorrichtung according to claim 6 and 7, characterized in that the holder (36) of the respective spring system (33) via a pivot axis (40) limited rotatably on one of the in the region of the section boundaries (23) arranged machine frame stand (39) of the textile machine ( 1) is set so that the spring system (33) in total from the range of action of the driver (31) can be swung out.

10. Fadenchangiervorrichtung according to claim 6 and 7, characterized in that the stop (32) of the spring system (33) is pivotally mounted on the guide pin (37), that the stop (32) from the area of action of the driver (31) is swung out.