WO2009129988A1

WO2009129988A1 - Compressor unit for a drawing frame of a textile machine

Info

Publication number: WO2009129988A1
Application number: PCT/EP2009/002880
Authority: WO
Inventors: Gerd Stahlecker; Karlheinz Huber
Original assignee: Spindelfabrik Suessen Gmbh
Priority date: 2008-04-24
Filing date: 2009-04-21
Publication date: 2009-10-29
Also published as: BRPI0910726B1; EP2300646B1; ES2587270T3; EP2300646A1; CN102016142B; CN102016142A; EP2314743B1; CN102037170B; BRPI0910483B1; DE102008057668A1; JP2011518962A; ES2561843T3; EP2300647A1; JP5426659B2; BRPI0910772A2; DE102008057617A1; BRPI0910772B1; WO2009129986A1; CN102027164B; CN102037170A

Abstract

The invention provides a compressor unit (20) for a drawing frame of a textile machine, containing at least one compressor channel (14) for a readily drawn fiber composite. The compressor unit contains a first (131) and a second (133) contact surface for positioning the compressor unit on a drawing frame roller (3). The compressor unit, the first and the second contact surfaces are configured in one piece.

Description

COMPRESSOR UNIT FOR A TRANSFER OF A TEXTILE MACHINE

The invention relates to a compressor unit for a drafting system of a textile machine, comprising at least one compression channel for a finished warped fiber structure and a first and a second support surface for positioning the compressor unit on a drafting roller.

From CN 2734787 Y a compressor unit of the aforementioned type is known which extends over two adjacent drafting systems. There are provided two bearing surfaces for a lower roller of the drafting system, which are spaced apart in the axial direction of the drafting roller. In each bearing surface compression channels are provided for finished warped fiber composites. The compressor unit is designed in several parts. The compressor unit contains two compressor components, each containing a support surface. The compressor components are movably arranged on a rod and align themselves when placed on the lower roller of the drafting system to the peripheral surface of the drafting roller and to each other.

The invention is based on the object to provide an improved compressor unit.

The object is achieved in that the compressor unit is integrally formed at least with the first and the second bearing surface.

A compressor unit with an integrally formed first and second bearing surface has the advantage that the two bearing surfaces are fixed in position to each other and can not move to each other. The compressor unit is very safe on the drafting roller, so that even with any machine vibrations occurring lifting of the bearing surfaces, especially in the region of a compression channel, can be avoided. In the manufacture of the compressor unit, the bearing surfaces are manufactured with the necessary precision and can thereafter no longer lose their alignment with each other. The first Support surface is arranged in the region of the compression channel, so that the compression channel is integrally integrated in the compressor unit. The first bearing surface is spatially separated from the second bearing surface, so that the two bearing surfaces are spaced from each other. The two bearing surfaces form a very stable support for the compressor unit, so that the compressor unit can be positioned very well and precisely on the lower roller of the drafting system. Both bearing surfaces can be made very small without loss of support stability, so that the manufacturing cost of the compressor unit is low.

From WO 03/095 723 A1 also a non-generic compressor unit is known in which a single, extremely large bearing surface is provided for the lower roller of the drafting system. The compressor unit is placed on the lower roller in the manner of a clasp. The bearing surface on the compressor unit encloses more than half of the circumference of the lower roller. The compressor unit can not be lifted off the lower roller and contains no compression channel open to the bearing surface. In addition, the precise production of such a large contact surface is very expensive.

The term "a bearing surface" is understood to mean that the bearing surface in the region of the compression channel is referred to as "a" surface, even if it is "divided" into one or more compression channels by a plurality of compression channels is, he "cuts through" virtually the support surface in two parts that do not touch anymore. In order for the compression channel to be able to perform its full function on both sides of the compression channel, part of the support surface must "remain" to seal the compression channel to the peripheral surface of the drafting roller.The two parts of the support surface form a functional unit and are therefore considered as " a bearing surface ". Even if a plurality of compression channels are arranged in the region of a support surface, the designation remains "a support surface." A design of a support surface in the region of the compression channel known from DE 103 56 913 A1 has nothing to do with the second support surface now provided, that of the compression channel Also in DE 103 56 913 A1, the entire area adjoining the compression channel forms functionally "a bearing surface" which seals the compression channel to the circumferential surface of the drafting roller.

The compressor unit is understood literally meaning that the "unit" can be formed by an assembly, even if it is provided according to the invention that at least two mutually spaced bearing surfaces are arranged on a single component. The Individual parts of the assembly are captively connected to each other, but need not necessarily be immovably connected to each other and can also be disassembled. The "unit" represents an independently tradable item.

For the compressor unit with a first and a second molded from a single piece support surface or for a main body of the compressor unit, which contains at least two bearing surfaces, different materials are advantageous. Advantageously, a wear-resistant material that can withstand the sliding movements of the support surface on the drafting roller for a long time. The compressor unit may be made of ceramic or steel. To ensure the precision of the bearing surfaces to each other, it can be provided that the bearing surfaces are ground. Also advantageous for the compressor unit is a brass or aluminum material. The compressor unit can then be designed as a die-cast part. To increase the wear resistance, a coating, for example a hard material layer, can be applied to the bearing surfaces. Particularly preferably, the compressor unit consists of a plastic material. The compressor unit can then be manufactured as an injection molded part and is ready for immediate use without reworking in the area of the bearing surfaces and the compression channel. Highly suitable plastic materials are PPS (polyphenylene sulfide) and PEEK (polyether ether ketone). The plastic material preferably contains at least one additive, which may be, for example, a hard and / or wear-reducing additive. For reinforcement, additives such as glass fibers, carbon fibers and / or glass beads may be included. The plastic material preferably contains friction-reducing additives, for example PTFE (polytetrafluoroethylene).

At least the bearing surface in the region of the compression channel is concavely curved, wherein the curvature is adapted to the peripheral surface of a cylinder. The term "cylinder" denotes a geometric base body. 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 support surface and the compressor unit are positioned very accurately on the drafting roller in the operating condition and sealed the tunnel-shaped compression channel very well to the peripheral surface of the drafting roller is. The tunnel-shaped compression channel has guide walls, which adjoin the bearing surface directly. Only through the peripheral surface of the drafting roller of the support surface open toward the compression channel to a closed channel. This has the advantage that the circumferential surface of the drafting roller serves as a transport element for the fiber structure in the compression zone. It is preferably provided that at least two bearing surfaces are concave, all curvatures are adapted to the peripheral surface of a common cylinder. It may also be advantageous to configure a second bearing surface, which is at a distance from the bearing surface in the region of the compression channel, convex or planar. The second bearing surface serves primarily to stabilize the compressor unit. For this purpose, it is sufficient if a line or point contact is provided between the second bearing surface and the peripheral surface of the drafting roller. This is particularly advantageous if this support surface is supported in an uneven area of the drafting roller.

It is also advantageous to configure the compressor unit so that it contains, in addition to a compression channel for a finished distorted fiber structure, a further 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 may be a convex guide surface which can be used for deflecting the fiber structure from the drafting plane. The guide surface may also be funnel-shaped to densify the fiber strand in the main draft zone.

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.

The compressor unit may have two bearing surfaces for the drafting roller. This embodiment is particularly advantageous for a compressor unit associated with a single drafting arrangement.

To further increase the stability of the compressor unit resting on the drafting roller, a configuration is advantageous in which at least three bearing surfaces are provided on the compressor unit, wherein two bearing surfaces are spaced apart in the circumferential direction of the drafting roller which can be brought into contact with the bearing surfaces, and wherein two bearing surfaces in Axial direction of the drafting roller are spaced from each other.

It can be advantageous that the compressor unit can be used for two adjacent drafting systems, wherein the compressor unit has at least two compression channels for ready-warped fiber composites of adjacent drafting systems. In the area of the compression channels, the Compressor unit on a first and a second support surface. The compressor unit may have at least one further bearing surface, which is spaced from the first bearing surface and the second bearing surface in the circumferential direction of the drafting roller. The first bearing surface is preferably spaced from the second bearing surface only in the axial direction of a drafting roller which can be brought into contact with the bearing surfaces. The first and the second bearing surface in the region of the adjacent drafting arrangements are preferably each arranged on a region of the compressor unit projecting on one side.

It may be advantageous for the compressor unit to comprise three bearing surfaces for the drafting roller, wherein the first bearing surface is spaced from the second bearing surface only in the axial direction of a drafting roller which can be brought into contact with the bearing surfaces, wherein the third bearing surface can be brought into contact with the bearing surfaces in the circumferential direction Drafting roller is spaced from the first and second bearing surface, and wherein the third bearing surface - seen in the axial direction of a contacting with the bearing surfaces drafting roller - is arranged approximately in the middle between the first and the second bearing surface. This embodiment is particularly advantageous for a compressor unit that can be used for two adjacent drafting systems. The three contact surfaces ensure a good and stable positioning of the compressor unit.

In an embodiment of the invention, it is advantageous that the compressor unit includes four bearing surfaces for the drafting roller, which are spaced from each other. Preferably, the first bearing surface is spaced apart from the second bearing surface only in the axial direction of the drafting roller and the third bearing surface is spaced from the fourth bearing surface only in the axial direction. As seen in the axial direction of the drafting roller which can be brought into contact with the bearing surfaces, the third and fourth bearing surfaces preferably have approximately the same distance from each other as the first and second bearing surfaces. The compressor unit preferably contains a guide surface for a fiber structure in the region of the third and the fourth support surface. A compressor unit for two adjacent drafting systems with two compaction channels for a finished warped fiber structure and two guide surfaces for a fiber strand can be very advantageously combined with a pressure roller assembly containing two pressure roller twins with top rollers for the adjacent drafting systems.

For optimum guidance of the fiber composites of the adjacent drafting systems, it is advantageous that at the compressor unit two guide surfaces for a fiber strand - in the axial direction seen a bringable with the support surfaces drafting roller - have about the same uprising to each other, as two compression channels for a finished warped fiber structure.

In a further embodiment of the invention, it is advantageous for the compressor unit to have means for fastening the compressor unit to a pressure roller assembly, in particular to a base body of a pressure roller assembly. The compressor unit can be lifted together with the pressure roller assembly of the drafting roller. The connecting means attach the compressor unit movable on the pressure roller assembly, so that the compressor unit is not lost even when lifting the pressure roller assembly of the drafting roller and can only move controlled. The means for securing the compressor unit to the pressure roller assembly may include 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 compressor unit preferably has a receptacle for a loading element. The spring may be attached to the holder of the compressor unit, wherein a joint is advantageous between the loading element and the holder. The other end of the spring can be fastened in the pressure roller assembly, preferably on the base body of the pressure roller assembly. 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 receptacle for a loading element on the compressor unit can also be contacted by a loading element contained in the printing roll unit, which transmits its loading force to the compressor unit in the region of the receptacle. Alternatively or additionally, the compressor unit may include a receptacle for a magnet and / or a magnet as a loading element.

In a further embodiment, it may be advantageous for the compressor unit to have 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 surfaces. 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 top rollers. The stop surface is preferably supported on a component of the pressure roller assembly. Preferably, a stop surface for positioning in the circumferential direction is arranged centrally between two bearing surfaces for the drafting roller when the compressor unit is designed for two adjacent drafting units. 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.

Show it:

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

FIG. 2 shows a view in the direction of the arrow II of FIG. 1 on the compressor unit,

FIG. 3 shows a view similar to FIG. 1 of a variant of a pressure roller assembly and a compressor unit,

FIG. 4 shows a view in the direction of the arrow IV of FIG. 3 of the compressor unit,

FIG. 5 shows a view of a compression channel of the compressor unit cut along the sectional surface V-V of FIG. 3,

FIG. 6 shows a view similar to FIG. 1 of a variant of a pressure roller assembly and a compressor unit,

Figure 7 is a view in the direction of arrow VII of Figure 6 on the compressor unit.

In the figures 1 to 7 a drafting 1 of a textile machine is shown very schematically. 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 pairs of rollers, only the pair of output rollers 3, 4 is shown, at its nip 5 of the delay of Fiber Association 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 are 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 upper rollers, not shown, are designed 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 in the middle between two adjacent drafting 1 and 1 'and arranged holds the pressure roller twin 4 at the axis 9. The lower roller 3 is formed as over a plurality of adjacent drafting 1, 1 'continuous drafting roller.

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 13, in particular to reduce 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. Subsequent to the nip line 16, the compressed fiber structure is twisted into a yarn 10 by being fed in withdrawal direction B to a swirl element (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 shown in Figures 1 to 7 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 Figures 1 and 2 is given the reference numeral 120, the compressor unit of Figures 3 to 5, the reference numeral 320 and the compressor unit, Figures 6 and 7, the reference numeral 620. If a compressor unit of all embodiments is meant, the reference numeral 20 is used, otherwise Numeral called the special 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 can, as shown in Figures 1 and 2, 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 shown in FIG. 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 an advantageous embodiment, it may be provided that the compressor unit 20 contains a guide surface 24 for the yarn 10. The guide surface 24 is downstream of the Compression channel 14 is arranged and serves to guide the yarn 10 following the nip line 16. By a guide surface 24, 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 15 is reduced.

FIGS. 1 and 2 show a first advantageous embodiment of a compressor unit 120. 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 clarity, in Figure 2, the circumferential direction C of the lower roller 3 and the axial direction D of the lower roller 3 is 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 compressor unit 120 is integrally formed with the three bearing surfaces 131, 132, 133. The three bearing surfaces 131, 132, 133 and the compression channels 14, 14 'are all integrated in a base body 25 of the compressor unit 120. The three support surfaces 131, 132, 133 can not lose their position to each other.

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. The lower roller 3 is usually provided in the region of the drafting units 1 and V at its outer periphery 13 with a corrugation. In the region between the drafting units 1 and 1 ", the lower roller 3 can be made smooth and without corrugation When the bearing surface 133 rests on the non-corrugated area of the drafting roller 3, the wear on the bearing surface 133 is less.

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, the helical compression spring 27 can be dispensed with, depending on the application. 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 easily deflect it from the shortest imaginary connecting line between the exit of the guide straps 7, 8 and the nip line 5. The fiber structure 2 then wraps around a portion of the convex guide surface 23. The guide surface 23 may be integrally disposed on the compressor unit, and - as indicated by the dashed lines - be contained in the main body 25. In an advantageous embodiment, not shown, the guide surface 23 is designed for the fiber structure 2 as a tapered guide channel, 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.

Since the contact forces of the fiber structure 2 and the yarn 10 with the guide surface 23 and

24 are often higher than the contact forces of the fiber structure 11 with the compression channel 14, it may be advantageous in an embodiment not shown that the guide surface 23 and / or the guide surface 24 is disposed on a wear-resistant component which is connected to the main body 25.

FIGS. 3 to 5 show a second embodiment of a compressor unit 320. 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 can be seen in Figure 5, the support surface 331 is separated by the compression channel 14 into two parts that do not 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. As seen in the axial direction D, the third support surface 333 and the fourth support surface 334 are approximately the same distance apart as the first support surface 331 and the second support surface 332. The compressor unit 320 contains a guide surface 23 for a fiber structure 2 in the area of the third support surface 333 and a guide surface 23 'in the region of the fourth bearing surface 334. The guide surfaces 23 and 23' are configured as tunnel-shaped compression channels, which are open to the bearing surface 333 and 334, respectively. The guide surfaces 23 cause 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 possibly deflect the fiber structure 2 somewhat from the stretching field plane, as shown in the guide surface 23 in Figure 1. 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 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 understood here as a designation of a geometric base body, which occupies the place of the drafting roller 3, which is later present in the operating state, during the production of the compressor unit 320.

The arc length of the support surface 331 - seen in each section perpendicular to the centerline of the support surface 331 - is less than 10 mm and preferably even less than 8 mm in order to simplify the production. 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. If the required accuracy of the concave bearing surface 331 is ensured by a grinding process, the smallest possible contact surface 331 reduces the effort during grinding. The remaining bearing surfaces 332, 333 and 334 are analogous to Support surface 331 designed. Instead of the compression channel 14, a guide surface 23 is provided in the region of the bearing surfaces 333 and 334.

The main body 25 of the compressor unit 320 includes four unilaterally projecting portions 341, 342, 343, 344, in which the bearing surfaces 331, 332, 333, 334 are located. Each projecting portion 341, 342, 343, 344 includes a compression channel 14, 14 'or a guide surface 23, 23'. Depending on the stability requirement on the compressor unit 320, it may be that the unilaterally projecting regions 341, 342, 343, 344 of the main body 25 are not sufficiently stable under load, in particular in the circumferential direction C alone. In order to increase the stability of the compressor unit 320, it may be advantageous for the compressor unit 320 to include a "yoke" or stabilization component 57 shown in broken lines (two-dot chain line), which connects the projecting regions 342 and 344 with one another. Similarly, the projecting portions 341 and 343 can be connected to a "yoke" or stabilizing member, not shown.

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 bearing surfaces 331 and 332. In an embodiment, not shown, two spaced abutment surfaces 51 may be provided which are arranged symmetrically between the two bearing surfaces 331 and 332. 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. For receiving the guide surfaces 24, 24 ', the main body 25 of the compressor unit 320 in dashed lines downstream of the compression channels 14, 14' increases. Preferably, the guide surfaces 24, 24 'can be formed by a rod 60 inserted into the base body 25. The rod 60 extends over the adjacent drafting units 1 and 1 '. The rod 60 is advantageously made of hardened steel. In an embodiment not shown, however, it may also be advantageous to integrate the guide surfaces 24, 24 'in one piece into the main body 25. The regions with the guide surfaces 24, 24 'can likewise have bearing surfaces for the drafting roller 3, and can be configured analogously to the projecting regions 343, 344, for example.

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 region in which the abutment surface 51 is located in FIG. 3, a cylindrical pin can be arranged which fixes the compressor unit 320 to the main 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 rod, which is inserted into the base body 25 analogously to the rod 60. Alternatively, it can also be advantageous to pivot the compressor unit 320 to be suspended from the axle 17. FIGS. 6 and 7 show a third embodiment of a compressor unit 620. 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 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 arranged on the main body 25 of the compressor unit 620.

To improve the support stability of the compressor unit 620, it may be advantageous to provide a third support surface 632 (shown in dashed lines). The bearing surfaces 631, 632, 633 and the loading element 27 are preferably arranged relative to one another such that the loading element in the view of FIG. 7 lies within an imaginary surface 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 any interference occurring on the drafting system 1 can not be transferred to the adjacent drafting system 1 ¹ . However, it is, as in the other embodiments, a pressure roller assembly 18 for two adjacent drafting 1, 1 'is provided. Two separate compressor units 620 and 620 ", which are preferably designed mirror-symmetrically to one another, are arranged in the pressure roller assembly 18. 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 may be provided with connecting means 21 "on the axis 17 of the pressure roller twin 15 and be pivotable about the axis 17, as shown in dashed lines in Figure 6. 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, can be dispensed with the support surface 632, the spring 27 and the captive 52 remain, however, 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.

The main body 25 of the compressor unit 620 contains at least one unilaterally projecting region 641, in which the bearing surface 631 is located. The projecting region 641 contains the compression channel 14. For the guide surface 23, a second projecting region 643 may be provided. 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 projecting portion 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 compaction of a finished distorted 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 are of course also different combined.

Claims

claims

Compressor unit for a drafting of a textile machine, comprising at least one compression channel for a finished warped fiber structure and a first and a second support surface for positioning the compressor unit on a drafting roller, characterized in that the compressor unit (20) at least with the first (31) and the second (32; 33) bearing surface is integrally formed.

2. Compressor unit according to claim 1, characterized in that the compressor unit (20) comprises at least one guide surface (23) for a fiber structure (2).

3. Compressor unit according to claim 1 or 2, characterized in that the compressor unit (120, 320) has at least two compression channels (14, 14 ') for finished warped slivers (11, 11') of adjacent drafting arrangements (1, 1 '), and the compressor unit (120; 320) has a first (131; 331) and a second (132; 332) bearing surface in the region of the compression channels (14; 14 ').

4. Compressor unit according to one of claims 1 to 3, characterized in that the compressor unit (20) at least one further bearing surface (33) for the drafting roller (3) which integrally formed with the compressor unit (20) and from the first (31) and the second (32) bearing surface is spaced.

5. Compressor unit according to claim 4, characterized in that the compressor unit (20) at least three bearing surface (31, 32, 33), wherein two bearing surfaces (31, 33) in the circumferential direction (C) one with the bearing surfaces (31, 32, 33) can be brought into contact with the drafting roller (3) are spaced from each other, and wherein two bearing surfaces (31, 32) in the axial direction (D) with the bearing surfaces (31, 32, 33) brought into contact with drafting roller (3) are spaced from each other.

6. Compressor unit according to claim 4 or 5, characterized in that the compressor unit (120, 320) has at least two compression channels (14, 14 ') for finished warped fiber composites (11, 11') of adjacent drafting arrangements (1, 1 ') the compressor unit (120; 320) has a first (131; 331) and a second (132; 332) bearing surface in the region of the compression channels (14, 14 ') and in that the compressor unit (120; 320) has at least one further bearing surface (133; 333 334) extending in the circumferential direction (C) the drafting roller (3) is spaced from the first (131; 331) and second (132; 332) bearing surfaces.

7. compressor unit according to one of claims 4 to 6, characterized in that the compressor unit (120) comprises three bearing surfaces (131, 132, 133) for the drafting roller (3), wherein the first bearing surface (131) only in the axial direction (D) a drafting roller (3) which can be brought into contact with the bearing surfaces (131, 132, 133) is spaced from the second bearing surface (132), wherein the third bearing surface (133) is arranged in the circumferential direction (C) with one of the bearing surfaces (131, 132, 133 ) contacting the drafting roller (3) from the first and second bearing surfaces (131, 132), and wherein the third bearing surface (133) - in the axial direction (D) of a contact with the bearing surfaces (131, 132, 133) in contact Drawing drafting roller (3) seen - is arranged approximately in the middle between the first (131) and the second (132) bearing surface.

8. Compressor unit according to one of claims 4 to 6, characterized in that the compressor unit (320) comprises four bearing surfaces (331, 332, 333, 334) for the drafting roller (3), which are spaced apart.

9. compressor unit according to claim 8, characterized in that the first bearing surface (331) only in the axial direction (D) of the bearing surfaces (331, 332, 333, 334) can be brought into contact with drafting roller (3) of the second bearing surface (332) is spaced, and that the third bearing surface (33) only in the axial direction (D) with the bearing surfaces (331, 332, 333, 334) contacting the drafting roller (3) from the fourth bearing surface (334) is spaced, wherein - in the axial direction (D) seen with the support surfaces (331, 332, 333, 334) in contact with a drafting roller (3) - the third (333) and fourth (334) support surface about the same distance from each other as the first (331) and the second (332) bearing surface.

10. Compressor unit according to claim 8 or 9, characterized in that the compressor unit (320) at least one guide surface (23) for a fiber structure (2) in the region of the third and fourth bearing surface (333, 334).

11. Compressor unit according to one of claims 4 to 10, characterized in that the compressor unit (120; 320) two compression channels (14, 14 ") for a finished warped fiber structure (11, 11 ') and two guide surfaces (23, 23') for a fiber structure (2, 2 ') contains.

12. Compressor unit according to claim 11, characterized in that two guide surfaces (23, 23 ') for a fiber structure (2, 2') - in the axial direction (D) one with the bearing surfaces (331, 332, 333, 334) can be brought into contact Drawing drafting roller (3) - have approximately the same distance to each other as two compression channels (14, 14 ') for a finished warped fiber strand (11, 1 V).

13. Compressor unit according to one of claims 1 to 12, characterized in that a bearing surface (31) is concave, wherein the curvature is adapted to the Umfangsf laugh a cylinder.

14. Compressor unit according to claim 13, characterized in that at least two bearing surfaces (31, 33) are concavely arched, wherein all curvatures are adapted to the peripheral surface of a common cylinder.

15. Compressor unit according to one of claims 1 to 14, characterized in that the compressor unit (20) at least one stop surface (51) for positioning the compressor unit (20) in the circumferential direction (C) one with the bearing surfaces (31, 33) can be brought into contact Drafting roller (3).

16. Compressor unit according to one of claims 1 to 15, characterized in that the compressor unit (20) at least one receptacle (28) for a loading element (27; 29; 58) for generating a bearing force on the bearing surfaces (31, 33).

17. Compressor unit according to one of claims 1 to 16, characterized in that the compressor unit (20) at least one loading element (29, 58) for generating a bearing force on the bearing surfaces (31, 33).

A compressor unit according to claim 17, characterized in that the loading element is a spring (58) fixed to the compressor unit (320).

19. compressor unit according to claim 17 or 18, characterized in that the Beiastungseiement is a magnet (29).

20. Compressor unit according to one of claims 1 to 19, characterized in that the distance between two circumferentially (C) spaced bearing surfaces (31, 33) is more than 5 mm, in particular about 7.5 mm to 9.5 mm.

21. Compressor unit according to one of claims 1 to 20, characterized in that a bearing surface (31, 33) of the compressor unit (20) has a length in the circumferential direction (C) of the bearing surfaces (31, 33) can be brought into contact with drafting roller (3). less than 14 mm, in particular less than 8 mm.

22. Compressor unit according to one of claims 1 to 21, characterized in that a concave bearing surface (31) of the compressor unit (20) has an arc length - seen in each section perpendicular to the center line of the concave support surface (31) - of less than 14 mm, in particular less than 8 mm.

23. Compressor unit according to one of claims 1 to 22, characterized in that the compressor unit (20) comprises means (21) for fastening the compressor unit (20) on a pressure roller assembly (18), in particular on a base body (19) of the pressure roller assembly (18). , having.

24. Compressor unit according to one of claims 1 to 23, characterized in that the compressor unit (20) comprises a base body (25) which contains at least two bearing surfaces (31; 32; 33).

25. Compressor unit according to one of claims 1 to 24, characterized in that the compressor unit (20) and / or the base body (25) consists of a die-cast or injection-molded part.

26. Compressor unit according to one of claims 1 to 25, characterized in that the compressor unit (20) and / or the base body (25) consists of a plastic material.

27, pressure roller assembly for a drafting of a textile machine with a base body and two pressure roller twins, which are received in the body, characterized in that the pressure roller assembly (18) at least one compressor unit (20) according to one of claims 1 to 26, wherein the compressor unit (20) is movably mounted on the pressure roller assembly (18).