EP2291560B1 - Condenser unit and drafting roll set for a drafting frame of a textile machine - Google Patents

Description

The invention relates to a compressor unit for a drafting system of a textile machine, with at least one compression channel for a finished distorted fiber structure. The invention also relates to a wear-resistant component for immovable attachment in a compressor unit for a drafting system of a textile machine and to a method for producing a compressor unit for a drafting system of a textile machine.

The invention further relates to a printing roll unit for a drafting system of a textile machine with a compressor unit, a base body and two pressure roller twins, which are accommodated in the base body.

A pressure roller assembly and a compressor unit of the type mentioned are from the WO 2006/005207 A1 known. The known compressor unit is formed in one piece and consists of a relatively large and complex ceramic part. The compressor unit includes a support surface for a lower roller of the drafting system. The compressor unit is arranged freely movable between two pressure rollers and is positioned on its support surface on the lower roller. In the circumferential direction of the lower roller, the compressor unit is positioned over a stop fixedly mounted on a pressure roller assembly. Due to its shape, the compressor unit is held captive between the two top rollers of the pressure roller twin, so that the compressor unit can not fall out and be lost when the pressure roller unit is lifted off the bottom roller. However, the compressor unit has no connection to the printing roll unit and can move freely with respect to the printing roll unit. The compressor unit projects beyond the covers of the upper rollers in the axial direction and has in these areas an enlarged circumferential surface of the lower roller support surface. A precise production of the complex ceramic part is very expensive, since in particular the relatively large contact surface completely must be reground to ensure a good circulation on the lower roller.

From the CN 2734787 Y a compressor unit is known which consists of several individual parts. There are two compressor components with compression channels for finished warped fiber composites. The two compressor components are movably arranged on a shaft which extends over two adjacent drafting systems. The shaft is suspended from the load carrier of the drafting system. The compressor components have a support surface for a lower roller of the drafting system. In the compressor components magnets are arranged, which pull the compressor component against the lower roller and bring the bearing surface of the compressor component with the lower roller in contact. When placing the compressor unit on the lower roller, the two compressor components each align by their contact surface on the lower roller.

In the WO 1996/016209 A1 . US_3,273,206 and the WO_2005 / 028720_A1 a mechanical compaction of a fiber structure is disclosed. The compression takes place with only a single compression element.

The DE 198 60 201 A1 discloses a pneumatic densification of a fiber strand. There is no mechanical guidance of the fiber structure for its compaction.

The WO 2003/095723 A1 describes a compressor component and a sliver leader. Both parts are attached independently. The compressor component is held on the lower roller or between two upper rollers. The sliver guide, however, is arranged on the axis of the output pressure roller.

In the EP 2 048 269 A1 , a document under Article 54 (3) EPC, discloses a multi-part compressor unit with cylinder-shell-shaped bearing surfaces. The positioning of the cylinder-shell-shaped Support surfaces to each other is achieved in that they automatically align when placed on the peripheral surface of the drafting roller. For this purpose strips are equipped with pins with which they can be clipped into a frame part.

The invention has for its object to provide an improved compressor unit and an improved pressure roller assembly.

The object is achieved with the features of the independent claim.

In the case of the printing roll unit, the object is achieved in that the printing roll unit has at least one means for fastening the compressor unit to the printing roll unit, wherein the compressor unit is movably mounted on the printing roll unit. The connecting means establish a force-transmitting connection between the compressor unit and the pressure roller assembly. The connecting means cause a defined mobility of the compressor unit.

A multi-part compressor unit has the advantage that the wear-resistant component can be made very small. The outer contour of the wear-resistant component can be substantially simplified. The wear-resistant component is thereby easier to manufacture. Due to the multi-part can be selected in different areas of the compressor unit advantageous for the function material. In different areas with different functions in each case the optimal for the function material can be selected. The compressor unit is provided at the points with a wear-resistant component, which are subject to increased wear, for example because they come into contact with the fiber structure. The immovable connection of a wear-resistant component to the holder creates a compressor unit which has a high degree of precision. A compressor unit made with sufficient accuracy can no longer lose its accuracy.

The compressor unit is understood in the sense of the word that the "unit" can be formed by an assembly consisting of several individual parts, and their items are permanently connected to each other. However, the items do not necessarily have to be immovably connected to each other and can also be disassembled. The "unit" represents an independently tradable item.

A wear-resistant component is an independently tradeable object that is necessary for the completion of a multi-part compressor unit. The wear-resistant component has a bearing surface for a drafting roller. A wear-resistant component for a compression zone of the drafting system contains a compression channel for a completely distorted fiber structure. A wear-resistant component for a main draft zone of the drafting system contains at least one guide surface for a fiber structure processed in the main drafting zone of the drafting system. In addition, the wear-resistant component has at least one receptacle for an element of the compressor unit. A wear-resistant component of this embodiment is very well adapted to the tasks to be fulfilled and yet easy to produce. The use of a wear-resistant material can be limited to those areas of the compressor unit that absolutely require wear protection. As a wear-resistant material, different materials are suitable. The wear-resistant component preferably consists of a hard metal, of ceramic or of a wear-resistant plastic, which may contain hard and / or wear-reducing additives.

A compression channel in the wear-resistant component is preferably arranged in the form of a tunnel in the region of the support surface and formed open towards the support surface. A wear-resistant component with a compression channel can also be referred to as a "compression component". A baffle of the compression channel adjoins directly to the support surface. The tunnel-shaped compression channel only becomes a closed channel through the peripheral surface of the drafting roller. This has the advantage that the peripheral surface the drafting roller serves as a transport element for the fiber structure in the compression zone. The support surface for the drafting roller is concavely curved, the curvature being adapted to the peripheral surface of a cylinder. The term cylinder denotes a geometric base. The diameter of the cylinder, to which the curvature of the support surface is adjusted, advantageously corresponds very closely to the outer diameter of the drafting roller, so that the wear-resistant component and the compressor unit are positioned very accurately on the drafting roller in the operating condition and the tunnel-shaped compression channel very well to the peripheral surface of the drafting roller is sealed.

Due to the immovable attachment of the wear-resistant component to the holder of the compressor unit, the support surface can be made very small. The holder is a component of the compressor unit and may also be referred to as the "unit of the compressor unit". On the holder several wear-resistant components are immovably mounted. The holder takes over part of the positioning of the compression channel, so that the support surface does not have to ensure the positioning alone. The support surface can thereby be greatly reduced, in particular in the circumferential direction of the drafting roller, so that simplifies the production of the wear-resistant component. Preferably, the arc length of the support surface - seen in each section perpendicular to the center line of the cylinder is smaller than 14 mm, advantageously smaller than 10 mm and particularly advantageously even smaller than 8 mm. The smaller the arc length of the support surface, the lower the manufacturing inaccuracy of a - for example made of ceramic - wear-resistant component. A usually necessary blending the support surface is thereby simplified in any case and can even be omitted with sufficient accuracy of the wear-resistant component.

In the manufacture of a compressor unit, a wear-resistant component is immovably connected to a holder. For the immobile connection of the wear-resistant component with the holder, different approaches are advantageous. It may be advantageous that a press connection between the holder and a wear-resistant component is present. A frictional press connection has the advantage that the immovable connection is fully loadable immediately after the pressing process. In particular, when the holder is designed as an injection molded part, it may be advantageous that a portion of a wear-resistant component is encapsulated by the material of the holder. Particularly advantageously, the wear-resistant component is integrally connected to the holder. A cohesive connection can preferably be produced by soldering or by gluing. A wear-resistant component can be embedded in the still soft material of the holder, an adhesive or a solder and is immovably fixed by curing.

In an advantageous embodiment, the wear-resistant component has a receptacle for a protruding from the holder of the compressor unit pin, in particular for a substantially cylindrical pin. The receptacle can preferably be formed by a blind hole. Such a receptacle for an element of the compressor unit has the advantage that the wear-resistant component can be very easily pushed onto the holder of the compressor unit and fixed there - for example by gluing. In order to ensure a high stability of the pin protruding from the compressor unit, the blind hole has a diameter of more than 2 mm, in particular more than 3 mm, at least in one region. For ease of manufacture, the blind hole may be conical and taper towards its base. Preferably, the center line of the blind hole extends parallel to the center line of the curved bearing surface. It is advantageous that the compression channel in the wear-resistant component - viewed in a section along the center line of the blind hole - extends below the base of the blind hole. Thus, a large diameter of the blind hole in a small wear-resistant component can accommodate.

According to an advantageous embodiment, a compressor unit is provided in which a wear-resistant component is arranged cantilevered on the holder of the compressor unit. Projecting means that the wear-resistant component is attached to the holder on only one side. Projecting also means that the attachment of the holder to a pressure roller assembly is only on one side of the compression channel. A cantilevered arrangement of the wear-resistant component on the holder is given in particular when the wear-resistant component has a receptacle for a protruding from the holder pin, wherein the center line of the receptacle extends parallel to the center line of the curved bearing surface of the wear-resistant component.

For fastening a wear-resistant component to a compressor unit, it is provided that the holder has a receptacle for a wear-resistant component. Preferably, the receptacle for the wear-resistant component by a pin, in particular a substantially cylindrical pin formed, which protrudes from the holder.

The compressor unit includes at least two wear-resistant components which are immovably connected to the holder. Two wear-resistant components, each with a bearing surface are provided for a drafting roller. In particular, when two wear-resistant components are arranged on the holder, that the two bearing surfaces are seen in the circumferential direction of the drafting roller spaced from each other, the compressor unit can be positioned better and more stable on the drafting roller. It is advantageous that the distance - seen in the circumferential direction of the drafting roller - between the bearing surfaces of the two wear-resistant components about 7 mm to 22 mm, in particular 7.5 mm to 15 mm.

The compressor unit is to be designed so that it contains, in addition to a compression channel for a finished warped fiber structure, another guide surface for a fiber structure. Preferably, a guide surface is provided for a fiber structure in the main drafting zone of the drafting system. The guide surface is - viewed in the transport direction of the fiber strand - arranged upstream of the compression channel. The guide surface for the fiber structure can be a convex guide surface, which can be used for deflecting the fiber structure from the stretching field plane. The guide surface may also be funnel-shaped to densify the fiber strand in the main draft zone. For such a configuration, the first wear-resistant component contains at least one guide surface for a fiber structure and contains the second wear-resistant component at least one compression channel for a finished warped fiber structure.

It may be advantageous that the compressor unit contains two wear-resistant components, each with a bearing surface for a drafting roller and can be used for two adjacent drafting systems, wherein the wear-resistant components are arranged on the holder, that the two bearing surfaces in the axial direction of the drafting roller seen from each other are spaced , Two bearing surfaces spaced apart in the axial direction of the drafting roller cause a particularly good and stable positioning of the compressor unit on the drafting roller.

Of course, spaced in the circumferential direction and in the axial direction of the drafting roller bearing surfaces can also be combined on a compressor unit. The compressor unit then contains three or four wear-resistant components, each with a support surface for the drafting roller.

In a compressor unit for two adjacent drafting systems, it is advantageous that the wear-resistant component has two receptacles for one of a Holder of the compressor unit has outstanding pin, so that the wear-resistant component can be used for both drafting. A wear-resistant component can be mounted on both sides of the holder through its two receptacles, so that the variety of parts of the wear-resistant components can be reduced. Preferably, the two receptacles - in particular seen in a section along the center line of the support surface - are located on opposite sides of the compression channel or the guide surface.

To enhance the stability of the compressor unit, it may be advantageous for the holder to comprise a continuous rod, for example made of steel and preferably cylindrical, which extends between two adjacent drafting systems associated wear-resistant components and whose ends protrude into the wear-resistant components. In order to ensure sufficient stability, the rod has a diameter of at least 2 mm or more, in particular 3 mm or more, in at least one region. The ends of the rod protrude as a pin out of the holder and each form a receptacle for a wear-resistant component.

In a further embodiment of the invention, it is advantageous that the compressor unit has at least one stop surface for positioning the compressor unit in the circumferential direction of a drafting roller which can be brought into contact with the bearing surface. The abutment surface for positioning in the circumferential direction causes the compressor unit is not entrained by the rotation of the drafting roller. In particular, the compression channel is precisely positioned by the abutment surface with respect to the nip lines of the pressure rollers.

In order to ensure a secure system of the compressor unit on the drafting roller, advantageously at least one receptacle for a loading element for generating a bearing force on the bearing surfaces is provided. A loading element contained in the printing roll unit contacted the compressor unit in the region of the receptacle and transmits its loading force to the compressor unit. It may also be advantageous that the compressor unit contains a loading element for generating a bearing force on the bearing surfaces, or that a loading element is attached to the compressor unit. Such an embodiment has the advantage that the loading element with the compressor unit forms an assembly which can be used in a pressure roller assembly and also easily replaceable. The strength of the loading element can be adapted to the requirements of the compressor unit. The loading element may preferably be a spring, in particular a leaf spring, which is attached to the holder. Preferably, the spring is attached via a hinge on the holder. Another advantageous loading element is a magnet. The receptacle for the loading element or the loading element itself is preferably arranged on the holder of the compressor unit. This is a further advantage of the multi-part design of the compressor unit, since the loading elements for generating the bearing force no longer have to be arranged directly on the wear-resistant component.

In an embodiment of the invention it can be provided that the compressor unit has at least one guide surface for a yarn. A guide surface for a yarn can reduce the wear of an elastic cover on the top roller bounding the compaction zone.

In the manufacture of a compressor unit having at least two wear-resistant components, a method is used in which the at least two wear-resistant components are aligned with each other and are connected in the aligned state with a holder, so that the wear-resistant components are immovably fixed to the holder. The alignment of the wear-resistant components is preferably done by placing the compressor unit on a convexly curved and the peripheral surface of a cylinder adapted surface. The diameter of the cylinder corresponds as exactly as possible to the diameter of the drafting roller, for which the compressor unit is to be used later. The alignment of the wear-resistant components is facilitated if at least one wear-resistant component has a concavely curved support surface for a drafting roller, wherein the curvature of the support surface is adapted to the peripheral surface of the cylinder, so that the support surface aligns the wear-resistant component when placed on the convexly curved surface ,

The fixation of the wear-resistant components on the holder can be done by the wear-resistant components are inserted into a mold and partially encapsulated with the material of the holder. The convexly curved surface for aligning the wear-resistant components is arranged in the region of the injection mold, so that the wear-resistant components are in exactly aligned state during encapsulation.

In a particularly advantageous manufacturing method, the wear-resistant components are fixed by gluing the holder. The holder of the compressor unit has a receptacle for each wear-resistant component, wherein an adhesive is applied in the region of each receptacle, the wear-resistant components are placed on the soft adhesive and aligned with each other, so that the wear-resistant components in the aligned state by the curing adhesive immovable on Holder to be fixed.

A production of the compressor unit according to the described method has the advantage that it is very easy to manufacture a compressor unit which rests very stably and securely on the drafting roller. A lifting of the compressor unit from the peripheral surface of the drafting roller by vibrations occurring during operation can thereby be largely prevented. In addition, the post-processing can be minimized to the bearing surface of the compressor unit. The wear-resistant components with their bearing surfaces are preferably finished before fixing to the holder, so that after fixing on the holder only a minor reworking is required at the bearing surfaces for the drafting roller. Preferably, no further post-processing is made.

An inventive printing roll unit in which the compressor unit with a connecting means is movably mounted on the printing roll unit, has the advantage that the compressor unit is not lost even when lifting the pressure roller assembly of the drafting roller and can only move controlled. In contrast to that from the WO 2006/005207 A1 Known printing roll unit can now perform the compressor unit due to the connecting means no uncontrolled movements between the pressure rollers more. The mobility is defined by the means for fixing the compressor unit. A connecting means is designed such that in at least one direction a force can be transmitted from the pressure roller assembly to the compressor unit. Depending on the embodiment, the connecting means can be attached to the main body and / or to an axis of a pressure roller twin.

The two pressure roller twins are arranged on a base body so that the upper rollers of the pressure roller twins do not touch and that the pressure roller unit can be placed on a drafting roller. Both pressure roller twins come into contact with the peripheral surface of the lower roller when placed on the lower roller of the drafting system, so that the upper rollers of the pressure roller assembly with the common lower roller form two successive clamping lines, between which the compression zone is located. The compression channel of the compressor unit is arranged on the pressure roller assembly so that the compression channel for the finished warped fiber strand is in the compression zone. The pressure roller twins are received in the base body so that the peripheral surface of the drafting roller which can be brought into contact with the pressure roller twins forms a transport element for the finished distorted fiber strand in the compression zone.

Preferably, the axes of the pressure roller twins are immovably received in the main body of the printing roll unit. The two pressure roller twins can thereby not change their position to each other, so that the pressure roller assembly when placed on the drafting roller aligns so that the axes of the upper rollers and the lower roller are parallel.

The movably arranged in the printing roll unit compressor unit also aligns when placing the pressure roller assembly on the drafting unit lower roller on the peripheral surface of the drafting roller. Preferably, the main body of the pressure roller assembly has at least one stop for positioning the compressor unit in the circumferential direction of a drafting roller which can be brought into contact with the pressure rollers. In addition, it may be advantageous to make the attachment of the pressure roller assembly to a load carrier of the drafting system so that the pressure roller assembly can perform a compensating pivotal movement about an imaginary axis perpendicular to the stretching field plane and about an imaginary axis parallel to the transport direction of the fiber structure. Preferably, the pressure roller twin forming the nip line at the end of the draft zone is movably mounted on the load carrier on its axis.

In an embodiment of the invention, it is provided that the means for securing the compressor unit on the pressure roller assembly includes a loading element for generating a bearing force on the bearing surfaces of the compressor unit. The loading element is preferably designed as a spring, in particular as a leaf spring. The spring may be fastened to the base body of the pressure roller assembly and to the holder of the compressor unit, wherein a joint is advantageous between the loading element and the holder.

In one embodiment of the invention, it is provided that a connecting means is designed as a sliding guide, via which the compressor unit is movable in the main body of the printing roll unit. A sliding guide has the advantage that the compressor unit can only perform very narrowly defined movements on the pressure roller assembly. Alternatively, it may be advantageous to arrange the compressor unit pivotably in the main body of the pressure roller unit or to mount the compressor unit on an axis of a pressure roller twin, so that the compressor unit is pivotable about the axis. A pivotally movable compressor unit ensures good positioning with respect to the top rollers while maintaining a defined range of motion.

An advantageous embodiment of the pressure roller assembly includes a pneumatically acting loading element for generating a bearing force on the bearing surfaces of the compressor unit, in particular a pneumatic pressure pad, which preferably operates without compressed air connection.

Preferably, the connecting means between compressor unit and pressure roller assembly contain a captive, so that the compressor unit when lifting the pressure roller assembly of the drafting roller can not fall out and get lost. The captive is preferably formed by a clip or directly by the loading element.

Further advantages and features of the invention will become apparent from the claims and the following description of some embodiments in conjunction with the figures. Individual features of the different embodiments shown and described can be combined in any way, without exceeding the scope of the invention.

Figur 1

eine im Schnitt und vergrößert dargestellte Seitenansicht auf ein teilweise dargestelltes Streckwerk einer Textilmaschine mit einem Druckwalzenaggregat und einer Verdichtereinheit,

Figur 2

eine Ansicht in Richtung des Pfeiles II der Figur 1 auf die Verdichtereinheit,

Figur 3

eine Ansicht ähnlich Figur 1 auf eine Variante eines Druckwalzenaggregates und einer Verdichtereinheit,

Figur 4

eine Ansicht in Richtung des Pfeiles IV der Figur 3 auf die Verdichtereinheit,

Figur 5

eine entlang der Schnittfläche V-V der Figur 3 geschnittene Ansicht eines verschleißfesten Bauteils mit Verdichtungskanal,

Figur 6

eine Ansicht ähnlich Figur 1 auf eine Variante eines Druckwalzenaggregates und einer Verdichtereinheit,

Figur 7

eine Ansicht in Richtung des Pfeiles VII der Figur 6 auf die Verdichtereinheit.

Show it:

FIG. 1

a sectional side view and enlarged on a partially illustrated drafting of a textile machine with a pressure roller assembly and a compressor unit,

FIG. 2

a view in the direction of arrow II the FIG. 1 on the compressor unit,

FIG. 3

a view similar FIG. 1 to a variant of a printing roll unit and a compressor unit,

FIG. 4

a view in the direction of the arrow IV the FIG. 3 on the compressor unit,

FIG. 5

one along the cut surface VV of FIG. 3 sectional view of a wear-resistant component with compression channel,

FIG. 6

a view similar FIG. 1 to a variant of a printing roll unit and a compressor unit,

FIG. 7

a view in the direction of arrow VII of FIG. 6 on the compressor unit.

The embodiments of the Figures 1-2 and 6-7 are not covered by the valid claims.

In the FIGS. 1 to 7 is very schematically shown a drafting 1 a textile machine. The drafting system 1 is designed as a double apron drafting system. The drafting system 1 is arranged on a spinning machine, preferably on a ring spinning machine. The drafting system 1 warps in a conventional manner a fed in the transport direction A fiber strand 2 of staple fibers to the desired fineness. The fiber structure 2 is warped by a plurality of roller pairs arranged one behind the other in the transport direction A, which can be driven in the transport direction A with increasing peripheral speed. Of the roller pairs, only the pair of output rollers 3, 4 is shown, at the nip line 5 of the delay of the fiber structure 2 is completed. The pairs of rollers, and also the pair of rollers 3, 4, consist of a drivable lower roller 3 and a freely rotatable, to the lower roller 3 can be pressed upper roller 4. The upper roller 4 is provided with a cover made of a rubber-elastic material and is pressed against the lower roller 3, so that the fiber structure 2 is clamped at the nip line 5 between the drafting rollers 3 and 4. The top rollers will be held in a swing-open load carrier 6. The roller pair upstream of the pair of output rollers 3, 4 are assigned guide straps 7 and 8 in a manner known per se. The guide straps 7 and 8 guide the fiber structure 2 in the main draft zone of the drafting system 1, which extends from the nip line, not shown, of the pair of guide belts 7, 8 looped roller pair to the nip line 5. The upper roller 4 and the other Öberwalzen not shown are formed as so-called Druckwalzenzwillinge. A pair of printing rolls consists of two top rollers which are assigned to adjacent drafting units 1 and 1 'and which have a common axis 9. In the case shown, the two top rollers of the pressure roller twin 4 are designed as "Loswalzen", that is, the two top rollers are freely rotatably mounted on the non-rotating axis 9. The load carrier 6 is arranged in the middle between two adjacent drafting units 1 and 1 'and holds the twin pressure roller 4 at the axis 9. The lower roller 3 is formed as a drafting roller through a plurality of adjacent drafting 1, 1' continuous.

In a conventional drafting system 1, the finally warped fiber structure after the nip line 5 directly in withdrawal direction B a twisting element, not shown, for example, a ring spindle, fed and there is the finished yarn 10. To improve the quality of the yarn 10, in particular to reduce the hairiness, It is provided that the finished warped fiber structure 11 is passed, after the nip line 5 through a compression zone 12, in which the fiber structure 11 is compacted and compacted. The finished distorted fiber structure 11 rests on the peripheral surface 13 of the lower roller 3 and is thus transported through the compression zone 12. In the compression zone 12, the fiber structure 11 is guided through a compression channel 14. The compression channel 14 is designed tunnel-shaped and open to the lower roller 3. The lower roller 3 is associated with a second upper roller 15, which forms a nip 16 with the lower roller 3, which ends the compression zone 12. In connection to the nip line 16, the compressed fiber strand is twisted into a yarn 10 by being fed in withdrawal direction B a swirl member, not shown. The nip 16 forms a spin stop and ensures that the fiber structure 11 remains free of rotation in the compression zone 12.

The top rollers 15 of two adjacent drafting systems 1 and 1 'are also mounted on a common axis 17 and form a pair of pressure rollers. The printing roll twin 15 forms together with the printing roll twin 4 a pressure roller assembly 18. The pressure roller assembly 18 includes a base body 19 in which the two pressure roller twins 4, 15 are accommodated on their axes 9, 17. The printing roll unit 18 forms its own structural unit, which is mounted replaceably on the load carrier 6. The pressure roller twins 4 and 15 are arranged in the pressure roller assembly 18 so that the top rollers of the pressure roller twins 4 and 15 do not touch each other and that the top rollers are placed on a common drafting roller 3. The axes 9 and 17 are advantageously aligned as parallel as possible in the base body 19. It is advantageous that the axes 9 and 17 are received without play in the base body 19, that is, without possibility of movement with respect to the base body 19. The attachment of the pressure roller assembly 18 on the load carrier 6 is preferably such that the pressure roller assembly 18 is movable to some extent and can align when placing on the drafting roller 3. The attachment of the pressure roller assembly 18 on the load carrier 6 preferably allows a pendulum movement of the pressure roller assembly 18 about two mutually perpendicular imaginary axes, the both are perpendicular to the axis 9.

The printing roll unit 18 also includes a compressor unit 20 containing the compression channel 14. The compressor unit 20 is arranged in the region between the top rollers 4 and 15.

The compressor unit 20 is in the FIGS. 1 to 7 illustrated in different embodiments, which will be explained in more detail below. To identify the different embodiments, the reference numeral 20 is supplemented by the figure of the corresponding figure. The compressor unit of FIGS. 1 and 2 is given the reference numeral 120, the compression unit of FIGS. 3 to 5 the reference numeral 320 and the compressor unit the FIGS. 6 and 7 reference numeral 620. If a compressor unit of all embodiments is meant, the reference numeral 20 is used, otherwise the reference numeral is referred to the specific embodiment.

The compactor unit 20 is movably mounted on the printing drum assembly 18, at least one means 21 for fixing the compactor unit 20 to the printing drum assembly 18 is provided. There are different embodiments of the connecting means 21 are advantageous. In any case, cause the means 21 for securing that the compressor unit 20 does not accidentally fall out of the pressure roller assembly 18 and does not move uncontrollably on the pressure roller assembly 18. The connecting means 21 enable the transmission of at least one force from the pressure roller assembly 18 to the compressor unit 20. The means 21 for fastening are attached to the main body 19 of the pressure roller assembly 18 or to a part of a pressure roller twin 4, 15.

In the case of an existing older spinning machine with conventional drafting, it is possible to remove the previous output top roller 4 from the drafting system 1 and replace it with a pressure roller assembly 18. In this case, the receptacle 62 for the top roller 4 can be adapted to the requirements of the pressure roller assembly 18 on the load carrier 6. The existing spinning machine can be converted to a drafting system 1 with compression zone 12, so that after the conversion, a yarn 10 with improved quality can be produced.

In order to ensure the pressure of the pressure roller assembly 18 and in particular the upper roller 15 to the lower roller 3, a leaf spring 22 may be provided. The leaf spring 122 may, as in the FIGS. 1 and 2 represented, be attached to the load carrier 6 and press with its free end on the base body 19 of the pressure roller assembly 18. Another advantageous embodiment is in FIG. 3 shown. There, the leaf spring 322 is mounted on the base body 19 of the pressure roller assembly 18 and is supported with its free end on the load carrier 6 from.

In addition to the compression channel 14 for the finished warped fiber structure 11, it may be advantageous to provide a guide surface 23 for the fiber structure 2 in the main draft zone. A guide surface 23 can improve the quality of the distorted fiber structure 11. The guide surface 23 is arranged in the transport direction A upstream of the compression channel 14 on the compressor unit 20. The guide surface 23 serves to guide the fiber structure 2 downstream of the guide straps 7, 8 and upstream of the nip line 5.

In one embodiment, it may be provided that the compressor unit 20 contains a guide surface 24 for the yarn 10. The guide surface 24 is disposed downstream of the compression channel 14 and serves to guide the yarn 10 following the nip line 16. By a guide surface 24 of the contact area of the yarn 10 can be reduced with the top roller 15, so that the wear of the cover of the upper roller 15th reduced.

In the FIGS. 1 and 2 a non-inventive embodiment of a compressor unit 120 is shown. The compressor unit 120 is designed in several parts. The compressor unit 120 includes a holder 25 and three wear-resistant components 141, 142 and 143, which are immovably connected to the holder 25. The holder 25 practically forms a base body for the compressor unit 120 to which the wear-resistant components 141, 142, 143 attached are. The compressor unit 120 extends over two adjacent drafting units 1 and 1 'and contains two compression channels 14 and 14' for the finished warped fiber assemblies 11 and 11 'of the adjacent drafting units 1 and 1'. The compressor unit 120 includes a bearing surface 131 for positioning the compressor unit 120 on the drafting roller 3, which is arranged in the region of the compression channel 14. In the region of the compression channel 14 ', a second bearing surface 132 is provided. The compressor unit 120 includes a third support surface 133 for the drafting roller 3, which is spaced in the circumferential direction C of the lower roller 3 from the support surface 131 and from the support surface 132. For clarification is in FIG. 2 the circumferential direction C of the lower roller 3 and the axial direction D of the lower roller 3 are indicated by a double arrow. The representation of Figure 1 shows a view exactly in the axial direction D. The support surface 132 is spaced from the support surface 131 only in the axial direction D. In the circumferential direction C, the bearing surfaces 131 and 132 are in the same position.

The compressor unit 120 has three spaced bearing surfaces 131, 132 and 133, which ensure a stable support of the compressor unit 120 on the lower roller 3. It is ensured that the compressor unit 120 rests securely on the lower roller 3 even in the event of vibrations occurring and does not tilt. Viewed in the axial direction D of the drafting roller 3, which can be brought into contact with the bearing surfaces 131, 132, 133, the third bearing surface 133 is arranged approximately in the middle between the first bearing surface 131 and the second bearing surface 132.

The three bearing surfaces 131, 132, 133 are each arranged on a separate wear-resistant component 141, 142, 143. The compressor unit 120 is protected by the wear-resistant components 141, 142, 143 from premature wear on the support surfaces 131, 132, 133 by the rotating lower roller 3. The wear-resistant components 141 and 142 also each include a compression channel 14.

The bearing surfaces 131 and 132 in the region of the compression channels 14 and 14 'are concavely curved, wherein the curvature is adapted to the peripheral surface of a cylinder. As a result, the sealing of the tunnel-shaped compression channel 14 to the lower roller 3 is ensured. The support surface 133 is preferably flat or convex. Depending on the material of the holder, the wear-resistant component 143 can also be dispensed with in a not-shown embodiment, and the third support surface 133 can be arranged directly on the holder 25. The lower roller 3 is provided in the region of the drafting systems 1 and 1 'usually on its outer periphery 13 with a corrugation. In the area between the drafting units 1 and 1 ', the lower roller 3 can be made smooth and without corrugation. When the support surface 133 rests on the non-corrugated region of the drafting roller 3, the wear on the support surface 133 is lower, so that the wear-resistant component 133 can be dispensed with.

So that the wear-resistant components 141, 142, 143 do not lose their position relative to one another, they are immovably connected to the holder 25. For connection to the holder 25, each wear-resistant component 141, 142, 143 has a receptacle 45 for an element of the compressor unit 120. The holder 25 in turn has a receptacle 26 for the wear-resistant component 131. The receptacles 26 and 45 may be coordinated with each other so that a frictional press connection between the holder 25 and the wear-resistant member 131 is present. If the holder 25 is designed as an injection-molded part, it is advantageous that a portion of the wear-resistant component 131 is encapsulated by the material of the holder 25. The wear-resistant component can for this purpose be inserted into the injection mold of the holder 25, so that the liquid material flows around the receptacle 45 of the wear-resistant component 131. The receptacle 45 may then have projections and / or profiles in a configuration, not shown, in order to ensure a particularly good fixation in the material of the holder 25. The other two wear-resistant components 142 and 143 are designed analogously and fastened in the compressor unit 120.

Preferably, the three wear-resistant components 141, 142, 143 are aligned with each other and connected in the aligned state with the holder 25. For encapsulating the wear-resistant components 141, 142, 143, it is preferably provided that the injection mold for the holder 25 has a convexly curved surface which is adapted to the circumferential surface of a cylinder and onto which the wear-resistant components can be placed. The convexly curved and the peripheral surface of a cylinder adapted surface in the injection mold simulates the drafting roller 3 and ensures that the compressor unit 120 rests well on the drafting roller 3 after fixing the wear-resistant components. Each wear-resistant component 141, 142, 143 has a relatively small bearing surface 131, 132, 133, which can be produced with good accuracy even when manufacturing the wear-resistant component from a very hard material without too much manufacturing effort. By aligning the wear-resistant components 141, 142, 143 to each other can be dispensed with a post-processing of the support surfaces 131, 132, 133 after fixing the wear-resistant components on the holder 25 in most cases. If a post-processing of the bearing surfaces is provided, this may be minor.

The compressor unit 120 is movably mounted on the base body 19 of the pressure roller assembly 18 via means 21 for fastening. The fastening means 21 comprise a sliding guide 50, a loading element 27 and a captive securing device 52. The loading element 27 is a helical compression spring. The compressor unit 120 has a receptacle 28 for the helical compression spring 27. The helical compression spring 27 is seated in the receptacle 28 and is supported against the base body 19. The loading element 27 thereby generates a bearing force on the bearing surfaces 131, 132, 133. The helical compression spring 27 is arranged in the axial direction D in the middle between the bearing surfaces 131 and 132. To increase the contact force, the compressor unit 120 may include a magnet 29. If a magnet 29 is provided as a loading element can, depending on the application be dispensed with the helical compression spring 27. In another advantageous embodiment, the loading element 27 is pneumatically actuated. Instead of the helical compression spring 27 may be arranged in the receptacle 28 a pressurized air cushion-shaped element (not shown), which generates the bearing force. The cushion-shaped element is preferably designed autonomously without compressed air supply.

The sliding guide 50 as part of the connecting means 21 provides a defined mobility of the compressor unit 120. The compressor unit 120 includes a stop surface 51 for positioning compressor unit 120 in the circumferential direction C of the drafting roller 3. The compressor unit 120 has the tendency by the rotation of the drafting roller 3 in the circumferential direction C. to be taken. The stop surface 51 defines itself defined on the base body 19. The stop surface 51 is arranged centrally between the two compression channels 14 and 14 '.

The connecting means 21 comprise a clip 52, which forms a captive securing device for the compressor unit 120. The clip 52 prevents the compressor unit 120 from slipping out of the slide guide 50 when the pressure roller assembly 18 is lifted from the lower roller 3.

In an embodiment of the compressor unit 120, it may be provided that the compressor unit 120 contains at least one guide surface 23 or 23 'for the fiber structure 2. The guide surface 23 may guide the fiber structure 2 in the form of a cylindrical guide element and possibly slightly deflect it from the shortest imaginary connecting line between the outlet of the guide straps 7, 8 and the nip line 5. The fiber structure 2 then wraps around a part of the convex guide surface 23. The guide surface 23 may be arranged on a wear-resistant component, which - as indicated by the dashed lines - is attached to the holder 25. In an advantageous embodiment, not shown, the guide surface 23 for the fiber structure 2 as a tapered guide channel designed, which already causes a compression of the fiber structure 2 in the main draft zone.

Also indicated by dashed lines is an enlarged compressor unit 120, which additionally contains guide surfaces 24, 24 'for the yarn 10. The guide surfaces 24 may also be arranged on wear-resistant components which are immovably connected to the holder 25.

In the FIGS. 3 to 5 an inventive embodiment of a compressor unit 320 is shown. The compressor unit 320 can be used for two adjacent drafting units 1 and 1 '. The compressor unit 320 includes two compression channels 14, 14 'for finished warped fiber composites 11, 11'. The compressor unit 320 includes a first support surface 331 for positioning the compressor unit 320 on a drafting roller 3, which is arranged in the region of the compression channel 14.

As in FIG. 5 recognizable, the support surface 331 is separated by the compression channel 14 into two parts, which no longer touch. Nevertheless, in the sense of the present patent application, only one bearing surface 331 in the region of the compression channel 14 is discussed.

The compressor unit 320 has a second bearing surface 332 for the drafting roller 3, which is arranged in the region of the compression channel 14 '. The compressor unit 320 includes two further bearing surfaces 333 and 334, which are spaced in the circumferential direction C of the bearing surfaces 331 and 332. The distance in the circumferential direction C is preferably 7.5 mm to 9.5 mm in order to ensure a stable support of the compressor unit 320. The first bearing surface 331 is spaced from the second bearing surface 332 only in the axial direction D of the drafting roller 3 which can be brought into contact with the bearing surfaces. The third bearing surface 333 is spaced apart from the fourth bearing surface 334 only in the axial direction D of the drafting roller 3. Seen in the axial direction D, the third bearing surface 333 and the fourth bearing surface The compressor unit 320 includes a guide surface 23 for a fiber structure 2 in the region of the third support surface 333 and a guide surface 23 'in the region of the fourth support surface 334. The guide surfaces 23 and 23 'are designed as tunnel-shaped compression channels, which are open to the support surface 333 and 334 out. The guide surfaces 23 effect a compression of the fiber structure 2 in the main drafting zone of the drafting system 1. In addition to a lateral compression of the fiber structure 2, the guide surfaces 23 may deflect the fiber structure 2 somewhat out of the stretching field plane, as in the guide surface 23 in FIG FIG. 1 is shown. Viewed in the axial direction D of the drafting roller 3, which can be brought into contact with the bearing surfaces 331, 332, 333, 334, the two guide surfaces 23, 23 'for the fiber structure 2, 2' are approximately the same distance apart as the two compression channels 14, 14 ' the finished warped fiber structure 11, 11 '.

The compressor unit 320 is formed in several parts and includes a holder 25 and four wear-resistant components 341, 342, 343 and 344, which are immovably connected to the holder 25. At each wear-resistant component 341, 342, 343, 344, a support surface 331, 332, 333, 334 for positioning the compressor unit 320 on the lower roller 3 is arranged. The wear-resistant components 341 and 342 have at least one compression channel 14 and 14 'for a completely warped fiber structure 11, 11'. The wear-resistant components 341 and 342 may also be referred to as compressor components. The wear-resistant components 343 and 344 each have a guide surface 23, 23 'for a fiber structure 2, 2'.

The bearing surfaces 331, 332, 333 and 334 are concavely curved, with all the bulges being adapted to the peripheral surface of a common cylinder. "Cylinder" is used here as a designation of a geometric base understood that in the production of the compressor unit 320 occupies the place of the drafting roller 3 later in the operating state.

The holder 25, which practically represents a main body of the compressor unit 320, contains a receptacle 26 for the wear-resistant component 341. The receptacle 26 is formed by a pin 53 which protrudes from the holder 25. The compressor unit 320 includes a rod 54. The rod 54 is inserted into the holder 25 and a protruding end of the rod 54 forms the pin 53rd

The wear-resistant component 341 has a receptacle 45 for the pin 53 protruding from the holder 25. The receptacle 45 is formed by a blind hole. For improved shaping of the wear-resistant component 341, the blind hole 45 may be slightly conical, for example when the wear-resistant component 341 is made of ceramic. The wear-resistant member 341 includes a second receptacle 45 '. The receptacle 45 'is also formed as a blind hole. It is located - seen in a section along the center line of the concave support surface 331 - with respect to the compression channel 14 on the opposite side as the receptacle 45. By the two receptacles 45 and 45 'can be in FIG. 5 shown wear-resistant component both as a wear-resistant component 341 and as a wear-resistant component 342 use. The variety of parts of the wear-resistant components can be reduced thereby. Will that be in FIG. 5 shown wear-resistant component used as a wear-resistant component 342, so it is attached to the receptacle 45 'to the holder 25. The blind hole 45 then remains empty.

To increase the stability of the compressor unit 320, the rod 54 from the drafting system 1 through to the drafting 1 'executed. The rod 54 is preferably made of hardened steel. The rod 54 extends between two adjacent drafting units 1 and 1 'assigned wear-resistant Components 341 and 342. The ends 53 of the rod 54 project into the wear-resistant components 341 and 342 inside.

In order to achieve a good stability of the compressor unit 320, the rod 54 has a diameter of at least 2 mm or more in at least one region. Preferably, the rod 54 has a diameter of 3 mm or more. The blind hole 45 has a diameter which is slightly larger than the diameter of the pin 53. As a result, the wear-resistant component 341 on the pin 53 can still align. The gap between pin 53 and blind hole 45 is filled by the adhesive. The arc length of the support surface 331 - seen in each section perpendicular to the center line of the support surface 331 - is less than 10 mm and preferably even less than 8 mm, to facilitate the production of the wear-resistant component 341. The center line of the support surface 331 corresponds to the center line of the cylinder, on whose peripheral surface the curvature of the support surface 331 is adjusted. The support surface 331 must be very accurate so that the tunnel-shaped compression channel 14 rests tightly on the lower roller 3 with its guide walls 46 immediately adjacent to the support surface 331. Since the required accuracy of the concave support surface 331 can be ensured in most cases only by a grinding process, the smallest possible contact surface 331 reduces the effort during grinding. The center line of the blind hole 45 extends parallel to the center line of the support surface 331. The compression channel 14 extends - seen in a section along the center line of the blind hole 45, so as in FIG. 5 At the same time, the compression channel 14 extends below the base area 47 'of the second blind hole 45'. This embodiment has the advantage that the compression channel 14 does not cross with a blind hole 45. Due to the small arc length of the support surface 331 and the associated small outer dimensions of the wear-resistant component 341 above the support surface 331 in conjunction with the large diameter of the blind hole 45 can be prevented so that the compression channel 14 is cut by a blind hole 45.

The wear-resistant components 343 and 344 are designed analogously to the wear-resistant component 341. Instead of the compression channel 14, a guide surface 23 is provided. The compressor unit 320 includes a second rod 56, the ends 55 of which protrude from the holder 25 in a pin-like manner, analogously to the rod 54, in order to receive the wear-resistant components 343 and 344 at their blind holes 45.

The wear-resistant components 341, 342, 343, 344 are arranged cantilevered on the holder 25 of the compressor unit 320, since they are attached to the compressor unit 320 only on one side. The holder 25 and its mounting area, so the receptacle 26, is - as in particular in FIG. 5 can be seen - only on one side of the compression channel 14. The along the center line of the concave support surface 331 elongated and prism-shaped wear-resistant component 341 is connected only at its end face to the holder 25. For the holder 25 thereby a preferred structural design is made possible because the space on the side facing away from the support surface 331 longitudinal side of the wear-resistant component 341 often not sufficient for attachment, which is particularly the case when the peripheral surfaces of the upper roller 4 and the top roller 15th very close to each other.

Depending on the stability requirement on the compressor unit 320, the elongated wear-resistant components 341, 342, 343, 344 which are cantilever-mounted on load, in particular in the circumferential direction C alone, may not be sufficiently stable. To increase the stability of the compressor unit 320, it may be advantageous for the compressor unit 320 to contain a stabilization component 57 shown in dashed lines (two-dot chain line). The stabilizing member 57 is not connected to the holder 25. The stabilizing component 57 designed as a kind of "yoke" connects two wear-resistant components 342 and 344 with each other. The stabilizing member 57 increases the stability of the cantilevered wear resistant components 342 and 344 at elevated loads in the circumferential direction C. The stabilizing member 57 may preferably be a correspondingly curved round profile. The stabilizing member 57 may preferably be mounted in the unused receptacles or blind holes 45 of the wear resistant members 342 and 344. Similarly, the wear-resistant components 341 and 343 can be connected to a stabilizing component, not shown.

The compressor unit 320 is preferably produced such that the wear-resistant components 341, 342, 343 and 344 are prefabricated and preferably completely finished. The holder 25 with the receptacles 26 for the wear-resistant components is also prefabricated. The receptacles 45 on the wear-resistant components 341, 342, 343, 344 are dimensionally adjusted so that they have to the recordings 26 game. The wear-resistant components are fixed by adhesive bonding on the holder 25. For the gluing process, an auxiliary device having a convexly curved surface adapted to the peripheral surface of a cylinder is used. The diameter of the cylinder corresponds as closely as possible to the diameter of the drafting roller 3. An adhesive is now applied in the region of the receptacles 26 and / or the receptacles 45. The wear-resistant components 341, 342, 343, 344 are then placed on the holder 25. The blind holes 45 are thereby pushed onto the pins 53 and 55. The compressor unit 320 with the still movable by the soft adhesive wear-resistant components 341, 342, 343, 344 is placed on the convex curved and the peripheral surface of a cylinder adapted surface of the auxiliary device. By placing the wear-resistant components 341, 342, 343, 344 adjust with their bearing surfaces 331, 332, 333, 334 to the cylindrical surface, which later corresponds to the drafting roller 3, and align the wear-resistant components to each other. The compressor unit 320 is held in this state until the adhesive hardens and fixes the wear-resistant components on the holder 25. When the adhesive has cured, the compressor unit 320 is in most cases ready for use. For certain applications, especially if a particularly high accuracy the compressor unit 320 is required, it can also be provided that the bearing surfaces 331, 332, 333, 334 are finally ground once again after fixing the wear-resistant components 341, 342, 343, 344 on the holder 25 in order to support the support of the compressor unit 320 to improve on the drafting roller 3 even further.

For fixing the compressor unit 320 on the pressure roller assembly 18, a connecting means 21 in the form of a leaf spring 58 is provided. The leaf spring 58 is at the same time a loading element for generating a bearing force on the bearing surfaces 331, 332, 333, 334. The leaf spring 58 is fastened with a screw 59 on the base body 19 of the pressure roller assembly 18. Together with the leaf spring 58, the screw 59 can also attach the leaf spring 322 to the base body 19. To increase the bearing force on the support surfaces 331, 332, 333, 334, the compressor unit 320 may include a magnet 29 shown in dashed lines.

The compressor unit 320 has a receptacle 28 for the leaf spring 58. The receptacle 28 is in the form of a hinge, which is preferably formed by a cylindrical pin 63, around which the leaf spring 58 is bent around. By the leaf spring 58 and the joint 28, the compressor unit 320 is movable and can be aligned when placing the pressure roller assembly 18 on the lower roller 3, so that the bearing surfaces 331, 332, 333 and 334 rest well on the peripheral surface 13. Due to the leaf spring 58 bent around the journal of the joint 28, the compressor unit 320 can not fall out of the pressure roller assembly 18. The captive 52 is thus formed by the loading element 58. Preferably, the assembly of the compressor unit 320 includes the loading element 58. The leaf spring 58 is thus supplied with the compressor unit 320 and may be adapted in its loading force to the requirements of this particular compressor unit 320.

For positioning the compressor unit 320 in the circumferential direction C, the compressor unit 320 has a stop surface 51, which is preferably arranged centrally between the wear-resistant components 341 and 342. In an embodiment, not shown, two spaced stop surfaces 51 may be provided, which are arranged symmetrically between the two wear-resistant components 341 and 342. The stop surface 51 is supported on the base body 19 or on the axis 17. Preferably, the surface 61 for supporting the abutment surface 51 is designed on the base body 19 such that it has a constant radius about the center line of the pressure roller axis 17. It is thereby ensured even then a correct position of the compressor unit 320 when the top rollers 4, 15, in particular the top roller 4, are reground when worn on their elastic covers.

In embodiment of the compressor unit 320, two guide surfaces 24 and 24 'for the finished yarn 10 and 10' may be provided. To accommodate the guide surfaces 24, 24 'of the holder 25 of the compressor unit 320 in dashed lines shown downstream of the compression channels 14, 14' increases. Preferably, the guide surfaces 24, 24 'can be formed by a rod 60 inserted into the holder 25. In an embodiment, not shown, it may also be advantageous, the guide surfaces 24, 24 'to be arranged on separate wear-resistant components, which are connected to the holder 25. The wear-resistant components with the guide surfaces 24, 24 'may also have bearing surfaces for the drafting roller 3, and may for example be designed and fastened analogously to the wear-resistant component 341.

In an alternative, not shown embodiment, the compressor unit 320 may also be arranged pivotably in the base body 19 of the pressure roller assembly 18. In the area where in FIG. 3 the abutment surface 51 is located, a cylindrical pin can be arranged, which fixes the compressor unit 320 on the base body 19 as a connecting means. The compressor unit 320 is pivotable about the centerline of the pin. If the compressor unit 320 is attached to a pin, it may be sufficient if the compressor unit 320 has only two bearing surfaces 331 and 332. On the support surfaces 333 and 334 in the region of the guide surfaces 23 and 23 'may then be waived if necessary. If the bearing surfaces 333 and 334 are omitted, the guide surfaces 23, 23 'can preferably be formed directly by the outer circumference of a somewhat extended rod 56. The rod 56, for example made of hardened steel, then forms a wear-resistant component attached to the holder 25. Alternatively, it can also be advantageous to mount the compressor unit 320 pivotably on the axle 17.

In the FIGS. 6 and 7 a further non-inventive embodiment of a compressor unit 620 is shown. The compressor unit 620 is associated with only one drafting device 1 and contains a compression channel 14 for a finished warped fiber structure 11. The compressor unit 620 includes a bearing surface 631 for positioning the compressor unit 620 on the drafting roller 3, which is arranged in the region of the compression channel 14. The support surface 631 is concave and adapted to the peripheral surface 13. The compressor unit 620 is designed in several parts and contains a holder 25 and a wear-resistant component 641, which is immovably connected to the holder 25. The bearing surface 631 is arranged on the wear-resistant component 641.

The compressor unit 620 includes a further bearing surface 633 for the drafting roller 3, which is spaced in the circumferential direction C of the support surface 631. The support surface 633 may be flat or convex. The bearing surface 633 is preferably arranged on a wear-resistant component 643. Alternatively, the bearing surface 633 may be arranged directly on the compressor unit 620 even without a wear-resistant component 643. The attachment of the wear-resistant components 641 and 643 is preferably carried out as has already been described in relation to the other figures.

To improve the support stability of the compressor unit 620, it may be advantageous to provide a third support surface 632 (shown in phantom), which is preferably also arranged on a wear-resistant component. The bearing surfaces 631, 632, 633 and the loading element 27 are preferably arranged to one another such that the loading element in the view of FIG. 7 is within an imaginary area, which is formed by the imaginary shortest connecting lines between the centers of the bearing surfaces 631, 632 and 633.

The compressor unit 620 is designed only for a single drafting system 1 and thereby has the advantage that possibly occurring disturbances on the drafting system 1 can not be transferred to the adjacent drafting system 1 '. However, as in the other embodiments, a pressure roller assembly 18 is provided for two adjacent drafting systems 1, 1 '. In the pressure roller assembly 18, two separate compressor units 620 and 620 'are arranged, which are preferably designed mirror-symmetrical to each other. The compressor units 620 and 620 'are mounted separately movable on the pressure roller assembly 18.

Means 21 for fastening the compressor unit 620 to the pressure roller assembly 18 are provided, which include a sliding guide 50, a clip 52 as captive and a helical compression spring 27 as a loading element for generating a bearing force on the support surface 631, 633.

In an alternative embodiment, the sliding guide 50 can also be dispensed with. The compressor unit 620 can be hung with connecting means 21 'on the axis 17 of the pressure roller twin 15 and pivotable about the axis 17, as in FIG. 6 is shown in dashed lines. Instead of a stop surface 51 as part of the sliding guide 50, a stop surface 51 'is provided for positioning the compressor unit 620 in the circumferential direction C, which is supported on the axis 17. In this case, on the bearing surface 632 are omitted, the spring 27 and the captive 52 remain as shown.

In an embodiment, the compressor unit 620 may include a guide surface 23 for the fiber structure 2 and / or a guide surface 24 for the yarn 10. The guide surfaces 23 and 24 may be designed analogously to the embodiments already described with reference to the other figures. It may also be advantageous to arrange the support surface 633 in the region of the guide surface 23, and to provide there a wear-resistant component similar to the wear-resistant component 343.

The wear-resistant member 641 is cantilevered to the compressor unit 620. The means 21 for fastening the compressor unit 620 can thereby be arranged in the region between the drafting units 1, 1 ', where the space is less cramped than between the covers of the pressure roller twins 4 and 15 on the support surface 631 opposite side of the wear-resistant component 641st

In all embodiments, the processing of a single fiber structure 2 has been described in a drafting 1 so far. However, it is possible in a manner known per se to warp several fiber composites 2, in particular two fiber composites, together in a drafting system 1. At the nip line 5 are then two spaced apart fiber bundles 11, which are finished warped and are separated from each other by the compression zone 12 out. There are then two compression channels 14 are provided in the compression zone 12, which compress the two adjacent fiber composites 11. The two separately compacted fiber composites 11 are fed to a common twist element following the nip line 16 and twisted to a false twist. The number of compression channels 14 and the guide surfaces 23 in the described compressor units 20 can of course be adapted accordingly for such a production of false twist. For the compression of a finished warped Fiber structure 11 different forms of compression channels 14 are known. The selection of the compression channel 14 and the shaping of its guide walls 46 is selected on the basis of the corresponding case of application and the type of fiber structure 2 processed in the drafting system.

It should be expressly pointed out again that the different means described 21 for attaching the compressor unit 20 on the pressure roller assembly 18 and the connection method of the wear-resistant components are of course also different combined.

Claims (11)

1. A condensing unit to be arranged in a drafting system of a textile machine, comprising at least one condensing channel for a ready drafted fibre strand (11), the condensing unit (320) being designed as a multipart component and containing a holding device (25) and at least one first and one second wear-resistant components (341, 343; 342, 344), and each of the wear-resistant components (341, 343; 342, 344) having a supporting surface (331, 333) for a drafting system roller (3), wherein the at least two wear-resistant components (341, 343; 342, 344) are fixed to the holding device (25) in a way which permits no movement in relation to said holding device (25) and are arranged on the holding device (25) in such a way that both supporting surfaces (331, 333) are at a distance to one another in circumferential direction (C) of the drafting system roller (3) when mounted and the first wear-resistant component (343; 344) comprises a guiding surface (23) for the fibre strand (2) which guiding surface (23) is designed as a tapering guiding channel and the second wear-resistant component (341; 342) comprises the condensing channel (14) for the ready drafted fibre strand (11).
2. A condensing unit according to claim 1, characterized in that the wear-resistant components (341, 343; 342, 344) are arranged in an overhanging manner on the holding device (25) of the condensing unit (320).
3. A condensing unit according to claim 1 or 2, characterized in that the holding device (25) comprises a take-up (26) for each of the wear-resistant components (341, 343; 342, 344) said take-up (26) being formed by a pin (53; 55), which projects out of the holding device (25).
4. A condensing unit according to any one of the claims 1 to 3, characterized in that the distance between the supporting surfaces (331, 333) of the two wear-resistant components (341, 343) in circumferential direction (C) of the drafting system roller (3) measures between 7 mm and 22 mm, in particular between 7.5 mm and 9.5 mm.
5. A condensing unit according to any one of the claims 1 to 4, characterized in that the condensing unit (320) comprises a stabilizing component (57) not joined to the holding device (25), said stabilizing component (57) joining said two wear-resistant components (342, 344) together.
6. A condensing unit according to any one of the claims 1 to 5, characterized in that the condensing unit (320) contains three or four wear-resistant components (341, 342, 343, 344) each having a supporting surface (331, 332, 333, 334) for a drafting system roller (3), wherein the condensing unit (320) contains one or two pairs of wear-resistant components (341, 342; 343, 344) each having a supporting surface (331, 332; 333, 334) for a drafting system roller (3) and being applicable for two adjacent drafting systems (1, 1'), wherein the wear-resistant components (341, 342) are fixed to the holding device (25) in a way which permits no movement and are arranged on the holding device (25) in such a way that both supporting surfaces (331, 332) are at a distance to one another in axial direction (D) of the drafting system roller (3).
7. A condensing unit according to claim 6, characterized in that the condensing unit (320) contains two continuous bars (54; 56) which extend between two wear-resistant components (341, 342) assigned to two adjacent drafting systems (1, 1'), and whose ends (53, 55) project into said wear-resistant components (341, 342; 343, 344), wherein particularly each bar (54) comprises at least in one area a diameter of 2 mm or more, in particular of 3 mm or more.
8. A condensing unit according to any one of the claims 1 to 7, characterized in that the condensing unit (320) contains at least one stopping surface (51) for positioning the condensing unit (320) in circumferential direction (C) of the drafting system roller (3).
9. A condensing unit according to any one of the claims 1 to 8, characterized in that the condensing unit (320) comprises at least one take-up (28) for a loading element (27; 29; 58) for generating a contact force on the supporting surfaces (331; 332; 333; 334).
10. A condensing unit according to any one of the claims 1 to 9, characterized in that the condensing unit (320) comprises at least one loading element (27; 29; 58) for generating a loading force on the supporting surfaces (331; 332; 333; 334), wherein in particular the loading element is a spring (27, 58) which is connected to the holding device (25) and/or the loading element is a magnet (29).
11. A top roller aggregate (18) for a drafting system of a textile machine comprising a condensing unit, a base body (19) and two noncontacting twin top rollers, which are taken up in the base body, characterized in that the top roller aggregate (18) comprises a condensing unit (320) according to any one of the claims 1 to 10 and at least one means (21) for connecting the condensing unit (320) to the top roller aggregate (18), wherein the condensing unit (320) is mounted to the top roller aggregate (18) in a movable way.

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