EP4339341A1 - Air spinning machine and drawing frame unit for a spinning station of an air spinning machine - Google Patents

Abstract

The invention relates to an air-jet spinning machine and a drafting unit for a spinning station of an air-jet spinning machine for producing a thread or roving from a supplied sliver, with at least one pair of output rollers consisting of an output upper roller on a load carrier and a driven output lower roller on a lower roller support and forming a clamping line and one on the Bearing element arranged on the lower roller carrier for movably supporting an air spinneret. In order to provide a drafting unit for a spinning station of an air-jet spinning machine and an air-jet spinning machine which has a reliable pivotable air-jet spinning nozzle, which can be easily detached from the lower roller carrier if necessary, it is provided that the lower roller carrier comprises a bearing element having a free end, via which the Air spinneret can be accommodated, wherein the bearing element forms a pivot axis for pivoting the air spinneret between an operating position and a second position spaced therefrom, wherein the bearing element is connected to the lower roller carrier with a section spaced from the free end.

Description

• mindestens einem aus einer Ausgangsoberwalze an einem Belastungsträger und einer angetriebenen Ausgangsunterwalze an einem Unterwalzenträger bestehenden und eine Klemmlinie bildenden Ausgangswalzenpaar und
• einem an dem Unterwalzenträger angeordneten Lagerelement zum beweglichen Lagern einer Luftspinndüse.

The invention relates to a drafting unit for a spinning station of an air-jet spinning machine for producing a thread or roving from a supplied sliver

• at least one pair of output rollers consisting of an output upper roller on a load carrier and a driven output lower roller on a lower roller support and forming a clamping line and
• a bearing element arranged on the lower roller carrier for movably supporting an air spinneret.

Drafting units for textile machines are known in various designs from the prior art. They serve to stretch or distort a sliver, thereby reducing the cross-section of the fiber. During the draft, the fibers must be moved against each other as evenly as possible in order to achieve a sliver that is as uniform as possible.

To stretch the sliver, the drafting unit units usually have several pairs of rollers arranged one after the other, which, arranged next to one another, clamp the sliver running between them. A pair of rollers usually consists of a driven lower roller arranged on a lower roller carrier and an upper roller resting on the lower roller and arranged on a pivotable load carrier, which is rotatably held by the load carrier. A distortion of the sliver is achieved in that in the direction of transport of the sliver through the drafting unit, which is determined by the direction of rotation of the pairs of rollers, the peripheral speed increases from pair of rollers to pair of rollers.

When air spinning using a spinning machine for spinning a thread, the sliver is typically drawn according to the yarn fineness to be achieved using the drafting unit and then fed to an air spinneret of an air spinning device. Within the air spinning device, the outer fibers of the sliver are wound around the inner core fibers of the sliver using a vortex air flow generated by the air spinneret, thereby forming the thread strength required for the sliver Thread's crucial wrapping fibers. The thread formed in this way is finally drawn off via a discharge channel of the air-jet spinning device and, for example, wound up on a sleeve.

In known drafting unit units, the air spinning nozzle is arranged downstream of the output roller pair of the drafting unit on the lower roller support of the drafting unit in the transport direction of the sliver. To arrange the air spinneret on the lower roller carrier, it is known to use holders to be connected to the lower roller carrier and adapted to this, on which the air spinneret is pivotably arranged, so that it is transported between an operating position in which the sliver emerging from the pair of output rollers is conveyed into the air spinneret and can be adjusted to a maintenance position. In the maintenance position, for example, it is possible to easily clean the area between the spinneret and the pair of output rollers. In order to completely remove the spinneret from the lower roller carrier, for example to carry out maintenance work, it is necessary with the holders known from the prior art to remove it with the spinnerets arranged thereon from the lower roller carrier, for example by loosening corresponding screw connections, which fix the holder on the lower roller carrier. The air spinneret is usually pivotably arranged on the holder via two opposite bearing points, which also have a high positional tolerance.

When air-jet spinning using a roving machine for spinning a roving, the sliver produced, for example, from a draw frame, the so-called draw sliver, is fed to the roving machine. The roving machine comprises an air-jet spinning device, as described above, for example, wherein the dimensioning and the flow conditions of the air-jet spinning device for producing the roving are suitably adapted to an air-jet spinning device for producing a thread. The operation of such an air-jet spinning device of the roving machine for producing a roving is similar to that of the air-jet spinning devices of air-jet spinning machines for producing a thread.

Proceeding from this, the invention is based on the object of providing a drafting unit for a spinning station of an air-jet spinning machine and an air-jet spinning machine which has a reliable pivotable air-jet spinning nozzle, which can be easily moved if necessary. can be detached from the lower roller carrier, in particular without tools.

The invention solves the problem by a drafting unit with the features of claim 1 and by an air-jet spinning machine with the features of claim 8. Advantageous developments of the drafting unit are specified in the dependent claims 2 to 7.

According to a preferred embodiment, the air-jet spinning machine can be a spinning machine which is designed to produce a thread which can be wound onto a package tube to form a package, in particular a so-called cheese.

According to a further preferred embodiment, the air-jet spinning machine can be a roving machine for producing a roving, for example as described at the beginning. In such a roving machine, the air-jet spinning device is designed in such a way that the roving produced has a reversible protective twist. Such a reversible protective twist is known to be characterized by the fact that the roving remains capable of being distorted for a further processing process, such as on the ring spinning machine, whereby the imparting of twist introduced can be released again if necessary. The reversible protective rotation is usually achieved in such a way that the sliver fed to the air-jet spinning device is at least partially given a real twist by the air-jet spinning device. This means that at least some of the fibers of the supplied sliver receive a real twist, i.e. a rotation, in the course of the air-spinning process, which is achieved by means of the air flow generated in the air-spinning device.

What is characteristic of the drafting unit according to the invention is that the lower roller carrier comprises a bearing element having a free end, via which the air spinneret can be received and which forms a pivot axis for pivoting the air spinneret between an operating position and at least one second position spaced therefrom, the bearing element having one of the free end spaced section is connected to the lower roller carrier. The second position is a position further away from the output roller than the operating position with respect to the operating position that defines the first position. For example, the second position can define a maintenance position in which maintenance activities, as described above by way of example, are feasible. Alternatively, the second position may be a position different from the maintenance position. In particular, the second position can be between the operating position and the maintenance position or a position further away from the output roller with respect to the maintenance position. In the latter preferred case, the second position is provided downstream of both the operating position and the maintenance position in a direction emanating from the output roller. The second position can further preferably define an end position for the pivotable air spinneret, in which the air spinneret can have a maximum acceptable distance from the output roller.

The section for connection to the lower roller carrier can preferably be an end of the bearing element opposite the free end. As a result, the bearing element is defined and can be designed cost-effectively. Alternatively, the section can be a section lying between the free end and a further, in particular free, end of the bearing element opposite it. If necessary, this favors further arrangement options for further components on the bearing element. The connection of the bearing element to the lower roller carrier via the section is fundamentally freely selectable. According to a preferred embodiment, the lower roller carrier has a fastening receptacle which is designed to receive the section of the bearing element. More preferably, at least the fastening receptacle or the section of the bearing element is designed to enable a stationary fixation of the bearing element on the lower roller carrier. This can be done, for example, via a screw fastening or clamp fixation, which is more preferably spring-loaded.

The design of the drafting unit according to the invention makes it possible to arrange the air spinneret in a simple manner on the lower roller carrier or to remove it from it. To arrange the air spinneret on the lower roller carrier, it simply needs to be pushed onto the bearing element via the free end with an opening adapted to the free end of the bearing element. The air spinneret can be removed from the lower roller carrier by simply pushing the air spinneret off the bearing element over the free end. The bearing element, which is free at one end, thus allows easy assembly and disassembly of the air spinneret on the lower roller support and also offers the possibility of pivoting the air spinneret about the pivot axis formed by the bearing element between the operating position and the second position spaced therefrom. One-sided storage of the bearing element on the lower roller carrier also allows a particularly precise and play-free alignment of the pivot axis relative to the lower roller carrier.

In order to determine the position of the air spinneret in the pushing direction of the air spinneret onto the bearing element, in particular along the pivot axis, according to a preferred embodiment of the invention it is provided that the bearing element has a stop element in a section opposite the free end. The use of a stop element, for example in the form of a shoulder or flange that preferably at least partially or more preferably completely surrounds the pivot axis or the bearing element, allows an exact positioning of the air spinneret in the direction of its push-on onto the bearing element, so that the air spinneret is optimally opposite in the operating position the pair of output rollers can be arranged. A separate alignment can therefore be dispensed with.

According to a further preferred embodiment of the invention, the air spinneret is fixed in a secure position on the bearing element. The securing of the position of the air spinneret can in principle be freely selectable. In particular, to secure the position of the air spinneret on the bearing element, it is provided that the bearing element is designed in the region of its free end to accommodate a position securing element. The use of a position securing element, for example via a screw fastening or a clamp fixation, which can further preferably be designed to be spring-loaded, reliably ensures that the air spinneret does not slide off the bearing element in an unintentional manner. For example, the position securing element can be a screw that can be screwed onto the free end of the bearing element, a snap ring that can be arranged on the free end of the bearing element or a, in particular spring-loaded, pressure piece. Spring-loaded pressure pieces are well known and offer the advantage over a conventional clamping screw that the tip of the pressure piece is designed to be movable in a spring-loaded manner. As soon as a spring force acting on the tip of the pressure piece, which acts as a clamping force, is overcome, the tip moves in the direction of the pressure piece or into the pressure piece, whereby the component held by the spring-loaded pressure piece or the air spinneret is displaced on the bearing element can. Alternatively or additionally, the bearing element and a carrier carrying the air spinneret, which can be pushed onto the bearing element, can preferably have a tongue-and-groove locking mechanism, which works similarly to the preferred embodiment with the spring-loaded pressure piece, which runs along The pushing direction of the air spinneret then comes into engagement or disengagement when a defined force is overcome along the pushing direction. In contrast to the spring-loaded pressure piece, no spring-loaded pressure element such as the tip of the spring-loaded pressure piece is provided. Furthermore, alternatively or additionally, a locking lever can be provided, which is arranged to be rotatably movable transversely to the push-on direction on the lower roller carrier in order to secure the air spinneret after positioning on the bearing element to avoid movement against the push-on direction. The preferred use of a snap ring as a position securing element is characterized by the fact that, on the one hand, it ensures reliable positioning of the air spinneret on the bearing element and, on the other hand, enables simple and quick removal if necessary, so that the air spinneret can then be easily removed from the bearing element can.

The design of the bearing element forming the pivot axis for the air spinneret is fundamentally freely selectable. This can also be made in one piece with the lower roller carrier. According to a preferred embodiment of the invention, it is provided that the bearing element is arranged on a pivot axis carrier of the lower roller carrier. This preferred embodiment of the invention offers the possibility of removing the bearing element from the lower roller carrier if necessary and replacing it with a new bearing element, for example to enable the use of alternative air spinnerets on the drafting unit. According to a particularly preferred embodiment of the invention, it is provided that the bearing element is formed by a bearing bolt which is held in a stationary manner by the pivot axis support and is more preferably pressed or screwed into the pivot axis support. The use of a particularly pressed-in or screwed-in bearing pin ensures a high level of positional security with a very low storage tolerance, so that an optimal positioning of the air spinneret relative to the sliver emerging from the pair of output rollers can be ensured in a particularly reliable manner. Alternatively, the bearing pin can also be attached to the lower roller carrier or the pivot axis carrier via other types of fastening, such as a clamping or latching device, a bayonet lock or similar. For the type of fastening, it is essential to select the one that allows the bearing pin to be held in a stationary manner on the lower roller carrier or the pivot axis carrier.

The arrangement of the bearing element relative to the pair of output rollers is also fundamentally freely selectable. According to a preferred embodiment of the invention, it is provided that the bearing element is arranged in such a way that the air spinneret can be pivoted between the operating position and at least the second position along a direction of movement that runs transversely to the axis of rotation of the output roller, and more preferably runs orthogonally. Further preferably, the bearing element is arranged such that the air spinneret can be pivoted tangentially to the output lower roller between the operating position and the second position. According to this further preferred embodiment of the invention, the pivot axis runs parallel to the clamping line of the pair of output rollers and the pivot axis, the axis of rotation of the output lower roller and the axis of rotation of the output top roller lie in a common plane, i.e. i.e., span a common level. Due to the preferred or further preferred embodiment of the invention, the spinneret can be moved from the operating position at least into the second position, which can constitute the maintenance position and / or an end position for the pivotable air spinneret that is different from the operating position, in a direction of movement that causes the dissolution made easier by thickening in the yarn. In particular, the further preferred embodiment of the tangential pivoting of the air spinneret to the output roller contributes to the further improved resolution of thickenings in the yarn.

To facilitate the assembly of the air spinneret on the bearing element, according to a further preferred embodiment of the invention, a guide element arranged on the lower roller carrier is provided with a guide surface which extends parallel beyond the free end and at a distance from the bearing element. When mounting the air spinneret on the lower roller support, the guide element serves as a stop element, which makes it easier for the machine operator to arrange the air spinneret on the bearing element. The air spinneret is placed on the guide surface adjacent to the free end of the bearing element by the machine operator. When in contact with the guide surface, the air spinneret can then be displaced by a movement aligned parallel to the guide surface in the direction of the end of the bearing element opposite the free end of the bearing element. The spinneret can therefore be easily pushed onto the bearing element. The guide surface serves as an assembly aid, which enables particularly simple and quick assembly of the air spinneret on the lower roller support.

The invention further solves the problem by means of an air-jet spinning machine for producing a thread or roving from a supplied sliver, which has at least one drafting unit according to the invention or preferably further developed as described above.

The air-jet spinning machine according to the invention has the advantage that, if necessary, the air-jet spinning nozzle can be removed from the spinning position in a particularly simple and convenient manner. Maintenance and cleaning work can therefore be carried out conveniently in a short amount of time, meaning that there is only minimal downtime in the event of maintenance work.

Fig. 1

in schematischer Darstellung eine perspektivische Ansicht eines Teilbereichs einer Streckwerkeinheit mit einer von einem Lagerelement getrennten Luftspinndüse;

Fig. 2

in schematischer Darstellung eine perspektivische Ansicht eines Teilbereichs der Streckwerkeinheit von Fig. 1 mit der auf das Lagerelement aufgeschobenen Luftspinndüse in einer Wartungsposition;

Fig. 3

in schematischer Darstellung eine perspektivische Ansicht eines Teilbereichs der Streckwerkeinheit von Fig. 1 mit der in einer Betriebsposition angeordneten Luftspinndüse,

Fig. 4

in schematischer Darstellung eine perspektivische Ansicht eines Teilbereichs der Streckwerkeinheit von Fig. 1, und

Fig. 5

in schematischer Darstellung eine perspektivische Ansicht eines Teilbereichs einer Streckwerkeinheit mit der in einer Betriebsposition angeordneten Luftspinndüse nach einem weiteren Ausführungsbeispiel.

Embodiments of the invention are explained below with reference to the drawings, where the same reference numerals are used for the same functional elements. In the drawings show:

Fig. 1

a schematic representation of a perspective view of a portion of a drafting unit with an air spinneret separated from a bearing element;

Fig. 2

a schematic representation of a perspective view of a portion of the drafting unit from Fig. 1 with the air spinneret pushed onto the bearing element in a maintenance position;

Fig. 3

a schematic representation of a perspective view of a portion of the drafting unit from Fig. 1 with the air spinneret arranged in an operating position,

Fig. 4

a schematic representation of a perspective view of a portion of the drafting unit from Fig. 1 , and

Fig. 5

a schematic representation of a perspective view of a portion of a drafting unit with the air spinneret arranged in an operating position according to a further exemplary embodiment.

An in Figure 1 A perspective detail of a drafting unit 1 shown in a schematic representation shows the connection area of an air spinneret 2 in the area of an output lower roller 3 on a lower roller carrier 4 according to an exemplary embodiment. In Figure 1 the air spinneret is separated from the lower roller carrier 4.

The air spinneret 2 has a carrier 13 for arrangement on the lower roller carrier 4 with a bearing element receptacle 14 extending through the carrier 13. To Arrangement of the air spinneret 2 on the lower roller carrier 4, the bearing element holder 14 is placed on a bearing element 5 designed as a bearing pin in the direction of a bearing element carrier 10 carrying the bearing pin up to the in Figure 2 pushed position shown pushed onto the bearing pin 5.

In the in Figure 2 In the maintenance position of the air spinneret 2 shown, according to an exemplary embodiment, which constitutes a second position, it is pushed completely onto the bearing pin via a free end 6 of the bearing pin, with an end face of the carrier 13 facing the bearing element carrier 10 resting against a circumferential stop element 7 of the bearing pin. To secure the pushed-on position of the air spinneret 2 on the bearing pin, a snap ring 9 is used, which is inserted into a groove 8 surrounding the bearing pin in the area of the free end 6 of the bearing pin.

To simplify the arrangement of the air spinneret 2 on the lower roller carrier 4, a guide element 11 is arranged on the lower roller carrier 4, the guide surface 12 of which extends parallel to the bearing pin beyond its free end 6. To assemble the air spinneret 2, it is placed in the in Figure 1 shown position with the carrier 13 brought into contact with the guide surface 12 and pushed onto the guide surface 12 via the free end 6 of the bearing bolt until the carrier 13 rests with its end face facing the bearing element carrier 10 on the stop element 7 of the bearing bolt (cf. Figure 4 ).

From the in the Figure 2 In the maintenance position shown, the air spinneret 2 can move around the bearing pin or around the pivot axis formed by the bearing pin into the in Figure 3 shown operating position and pivoted back again, with the air spinneret 2 in the operating position in the sliver transport direction being arranged downstream of a clamping line formed by the output lower roller 3 and the output upper roller (not shown here) for receiving the supplied sliver.

Figure 5 shows a further exemplary embodiment, in which, in contrast to the previous exemplary embodiment, the pushing direction of the air spinneret 2 is reversed. The stop element 7 of the bearing pin is arranged along the push-on direction at the right end of the bearing pin, so that the air spinneret 2 can be pushed from the left over the free end 6 of the bearing pin located on the left. The guide element 11 is arranged at a corresponding position on the lower roller carrier 4. The carrier 13 of the air spinneret 2 points pushed-on state of the air spinneret 2 on the side facing the free end 6 of the bearing pin an end section 15 pushed onto the bearing pin, which has a bore for receiving a pressure piece 16, in particular a spring-loaded pressure piece. According to this exemplary embodiment, the pressure piece 16 is screwed into the bore 15 and engages with its tip in a recess, not shown, which is congruent on the bearing pin with the tip of the pressure piece 16, the recess being designed as a circumferential groove 8 on the bearing pin according to an exemplary embodiment . This allows the air spinneret 2 to be securely fixed on the bearing pin. To dismantle the air spinneret 2, the pressure piece 16 must be loosened in a defined manner in the unscrewing direction, whereby the air spinneret 2 becomes freely movable along the push-on direction. The use of such a pressure piece 16, in particular a spring-loaded pressure piece, simplifies the assembly and disassembly of the air spinneret 2 on or from the bearing pin.

Reference symbol list

1

Drafting unit

2

Air spinneret

3

Output bottom roller

4

Lower roller carrier

5

Bearing element

6

free ending

7

stop element

8th

Nut

9

snap ring

10

Bearing element carrier

11

Leadership element

12

Guide surface

13

carrier

14

Bearing element holder

15

End section of the beam

16

Pressure piece

Claims (9)

Drafting unit (1) for a spinning station of an air-jet spinning machine for producing a thread or roving from a supplied sliver, with - at least one pair of output rollers consisting of an output upper roller on a load carrier and a driven output lower roller (3) on a lower roller support (4) and forming a clamping line and - a bearing element (5) arranged on the lower roller carrier (4) for movably supporting an air spinneret (2), characterized in that
the lower roller support (4) comprises a bearing element (5) having at least one free end (6), via which the air spinneret (2) can be received, the bearing element (5) having a pivot axis for pivoting the air spinneret (2) between an operating position and at least a second position spaced therefrom, wherein the bearing element (5) is connected to the lower roller carrier (4) with a section spaced from the free end (6). Drafting unit (1) according to claim 1, characterized in that the second position is a maintenance position or a position different therefrom. Drafting unit (1) according to claim 1 or 2, characterized in that the bearing element (5) has a stop element (7) in a section opposite the free end (6). Drafting unit (1) according to one or more of the preceding claims, characterized in that the bearing element (5) in the area of the free end (6) is designed to accommodate a position securing element. Drafting unit (1) according to one or more of the preceding claims, characterized in that the bearing element (5) is arranged on a pivot axis support (10) of the lower roller support (4). Drafting unit (1) according to claim 5, characterized in that the bearing element (5) is held stationary by the pivot axis support (10), in particular in the pivot axis support (10) is formed by a bearing pin pressed or screwed in. Drafting unit (1) according to one or more of the preceding claims, characterized in that the bearing element (5) is arranged such that the air spinneret (2) runs along a direction of movement that runs transversely, in particular orthogonally, to the axis of rotation of the output roller (3). Operating position and at least the second position can be pivoted. Drafting unit (1) according to one or more of the preceding claims, characterized by a guide element (11) arranged on the lower roller carrier (4) with a guide surface (12) extending parallel beyond the free end (6) and at a distance from the bearing element (5). ). Air-jet spinning machine (1) for producing a thread or roving from a supplied sliver,
marked by
a spinning station with a drafting unit (1) according to one or more of claims 1 to 8.

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