JP2011518963A - Condensing unit for drafting unit of textile machinery - Google Patents

Abstract

The present invention is for a draft unit of a textile machine comprising at least one condensing channel for already drafted fiber strands and first and second support surfaces for positioning the condensing unit on the draft unit roller. A condensing unit is disclosed. In the present invention, the condensing unit (20) is characterized by being designed as a single unit with at least the first (31) and second (32; 33) support surfaces.
[Selection] Figure 1

Description

  The present invention relates to a drafting unit for a textile machine comprising at least one condensing channel for already drafted fiber strands and first and second support surfaces for positioning the condensing unit on the drafting unit roller. Condensation unit for

  A condensing unit of the above type spanning two adjacent draft units is disclosed in Chinese utility model CN2734787Y. Two support surfaces for the bottom roller of the draft unit are provided, which are located axially separated from each other. On each support surface, a condensation channel for already drafted fiber strands is provided. The condensation unit is designed as a multi-part component. The condensing unit includes two condensing components, each of which includes a support surface. The condensing component is arranged in a movable manner on the bar, and when placed on the bottom roller of the draft unit, it self-relates to the circumference of the draft unit roller and to each other. adjust.

  The object of the present invention is to create an improved condensing unit.

  This object has been achieved in accordance with the present invention because the condensing unit is designed with at least the first and second support surfaces and one piece.

  A condensing unit having a unitary molded first and second support surface has the advantage that both support surfaces are fixed relative to each other in their position and cannot move relative to each other. Since the condensing unit is in a very stable position of the draft unit roller, it is possible to prevent the support surface from being lifted, especially in the region of the condensing channel, in the event of mechanical vibration. In the production of the condensing unit, the support surfaces are produced with the required accuracy and then do not impair their mutual adjustment. Since the first support surface is arranged in the region of the condensation channel, the condensation channel is also integrated into the condensation unit. Since the first support surface is spatially separated from the second support surface, both support surfaces are spaced from each other. Since the two support surfaces form a very stable support for the condensation unit, the condensation unit can be positioned stably and accurately on the bottom roller of the draft unit. Both support surfaces can be designed very small without sacrificing support stability, so that the production cost of the condensing unit is low.

  In addition, an unusual condensing unit is disclosed in international patent application WO 03/095723 A1, which provides a single very large support surface for the bottom roller of the draft unit. The condensation unit is arranged like a clamp on the bottom roller. The support surface of the condensing unit thereby surrounds more than half of the outer circumference of the bottom roller. The condensing unit cannot be raised from the bottom roller and does not include a condensing channel open to the support surface. In addition, the precise production of this type of large support surface involves significant expenditure.

  The term “one support surface” refers to a support surface called “one surface” in the region of the condensation channel, even if the surface is “split” into several parts by one or more condensation channels. It is understood from that. Since the condensation channel is tunnel-shaped and is open to the support surface, it effectively “divides” the support surface into two parts, which no longer contact each other. In order for the condensation channel to be able to perform its function along its entire length, one part of the support surface is on both sides of the condensation channel in order to seal the condensation channel to the peripheral surface of the draft unit roller. Must be “maintained”. Both parts of the support surface form a functional unit and are therefore referred to as “one surface”. Even if a plurality of condensation channels are arranged in the region of one support surface, the expression “one support surface” is still used. The embodiment disclosed in the German patent application DE 10356913A1 of one support surface in the region of the condensation channel has nothing to do with the second support surface according to the invention, which is located away from the condensation channel. In the German patent application DE 10356913 A1, the function of the entire area bordering the condensation channel is to form a “single support surface” that closes the condensation channel against the peripheral surface of the draft unit roller.

  A "unit" is understood literally in that it is formed by one component group even if at least two support surfaces that are separated from each other according to the invention are arranged in a single part. . The individual parts are moored to each other and need not necessarily be fixedly connected to each other so that they cannot be moved, they are also interchangeable. A “unit” is an object that can be bought and sold independently.

  Different materials are advantageous in the case of a condensing unit having first and second support surfaces formed as a single unit, or in the case of a condensing unit substrate comprising at least two support surfaces. An abrasion resistant material that can withstand long-term sliding of the support surface on the draft unit roller is advantageous. The condensing unit can be made of ceramic or steel. In order to ensure the accuracy of the support surfaces relative to each other, the support surfaces can be configured to be ground. Advantageous for the condensing unit is brass or aluminum. The condensing unit can also be designed as a die cast part. In order to increase the wear resistance, a coating, for example a hard material coating, can be applied to the support surface. It is particularly advantageous for the condensation unit to be made from a synthetic material. The condensation unit can be manufactured as an injection molded part and can be applied immediately without prior reworking in the area of the support surface and the condensation channel. Suitable plastics are PPS (polyphenylene sulfide) and PEEK (polyetheretherketone). The plastic advantageously comprises at least one additive, which can be, for example, a hard and / or antiwear additive. Plastics can include additives such as glass fibers, carbon fibers, and / or glass beads for reinforcement. The plastic advantageously comprises an antifriction additive, such as PTFE (polytetrafluoroethylene).

  At least the support surface in the region of the condensation channel is concavely curved, so that the curvature is adapted to the circumferential surface of the cylinder. The term “cylinder” means a geometric substrate. The diameter of the cylinder against which the curvature of the support surface is adapted is such that the support surface and the condensing unit are arranged very closely during operation on the draft unit roller and the tunnel-type condensing channel is arranged around the draft unit roller. It is advantageous to match the outer diameter of the draft unit roller very precisely so that it is tightly sealed to the surface. The tunnel-type condensation channel includes a guide wall that directly contacts the support surface. It is the peripheral surface of the draft unit roller that eventually closes the condensation channel relative to the closed channel. This is advantageous because the peripheral surface of the draft unit roller acts as a transport element for the fiber strands in the condensation zone.

  Advantageously, the at least two support surfaces are concavely curved so that all curved surfaces are adapted to the peripheral surface of the common cylinder. It may also be advantageous to design the support surface in the region of the condensation channel, which is located away from the support surface, to be concave or planar. First of all, the second support surface helps to stabilize the condensing unit. If a line or point contact is provided between the second support surface and the peripheral surface of the draft unit roller, this is sufficient for this purpose. This is particularly advantageous when the support surface is supported in a non-grooved area of the draft unit roller.

  It is also advantageous to design the condensing unit so that in addition to containing condensing channels for already drafted fiber strands, there is also a guide surface for the fiber strands. It is advantageous to provide a guide surface for the fiber strands in the main draft zone of the draft unit. The guide surface is arranged upstream of the condensation channel as seen in the direction of fiber strand transport. The guide surface for the fiber strand can be a convex guide surface that can be applied to deflect the fiber strand from the draft surface. The guide surface can also be designed in a funnel shape to condense the fiber strands in the main draft zone.

  In an embodiment of the invention, the condensation unit can include at least one guide surface for the yarn. The yarn guide surface can reduce wear on the flexible cot of the top roller that contacts the condensation zone.

  The condensation zone can contain exactly two support surfaces for the draft unit roller. This embodiment is particularly advantageous for condensing units that are assigned a single draft unit.

  In order to further enhance the stability, the condensing unit is provided with at least three support surfaces, the two support surfaces are located apart from each other in the circumferential direction of the draft unit roller, and the draft unit roller is connected to the support surface. Advantageous is an embodiment of a condensing unit arranged on a draft unit roller, which can be brought into contact and is configured such that the two support surfaces are spaced apart from each other in the axial direction of the draft unit roller It is.

  It may be advantageous that the condensation unit is applicable to two adjacent draft units, and that the condensation unit comprises at least two condensation channels for already drafted fiber strands. The condensation unit includes first and second support surfaces in the region of the condensation channel. The condensing unit includes at least one additional support surface located in the circumferential direction of the draft unit roller and spaced from the first support surface and the second support surface. The first support surface is advantageously located away from the second support surface only in the axial direction of the draft unit roller which can be brought into contact with the support surface. Advantageously, the first and second support surfaces of adjacent draft unit regions are each arranged in a one-side protruding region of the condensing unit.

  The condensing unit includes three support surfaces for the draft unit roller, the first support surface being located away from the second support surface only in the axial direction of the draft unit roller that can contact the support surface The third support surface is located away from the first and second support surfaces in the circumferential direction of the draft unit roller that can be in contact with the draft unit roller, the third support surface being It may be advantageous to be arranged approximately in the middle between the first and second support surfaces as viewed in the axial direction of the draft unit roller that can be brought into contact with the support surface. This embodiment is particularly advantageous for condensing units applicable to two adjacent draft units. The three support surfaces ensure a good and stable positioning of the condensation unit.

  In an embodiment of the invention, it is advantageous that the condensing unit comprises four support surfaces for the draft unit roller, which support surfaces are located away from each other. The first support surface is located away from the second support surface only in the axial direction of the draft unit roller, and the third support surface is located away from the fourth support surface only in the axial direction. When viewed in the axial direction of the draft unit roller that can be brought into contact with the support surface, the third and fourth support surfaces are located at a distance approximately equal to the mutual distance between the first and second support surfaces. Is advantageous. The condensation unit advantageously includes guide surfaces for the fiber strands in the region of the third and fourth support surfaces. Condensing units for two adjacent draft units, including two condensing channels for ready-made fiber strands and two guide surfaces for fiber strands, can be advantageously combined with a top roller assembly, said top The roller assembly includes two twin top rollers with top rollers for adjacent draft units.

  For optimum guidance of the fiber strands of adjacent draft units, in the condensing unit, the two guide surfaces for the fiber strands are already drafted in the axial direction of the draft unit roller which can be brought into contact with the support surface. It is advantageous to have approximately the same mutual distance as the two condensation channels for the treated fiber strands.

  In a further embodiment of the invention, it is advantageous that the condensing unit comprises means for attaching the condensing unit to the top roller assembly, in particular to the substrate of the top roller assembly. The condensing unit can be lifted from the draft unit roller with the top roller assembly. Connection means move the condensing unit to the top roller assembly so that the condensing unit is not lost when the top roller assembly is lifted from the draft unit roller and can only move under controlled conditions Connect. The means for attaching the condensing unit to the top roller assembly can include a load element for generating a contact force on the support surface of the condensing unit. The load element is advantageously designed as a spring, in particular as a leaf spring. The condensing unit advantageously includes a take-up for the load element. The spring can be attached to the base of the condensing unit, and a joint element between the load element and the base is advantageous. The other end of the spring can be attached to the top roller assembly, preferably to the base body of the top roller assembly. Such an embodiment is advantageous in that the load element together with the condensing unit forms a group of components that can be applied to the top roller assembly and are also easily replaceable. The force of the load element can be adapted to the requirements of the condensation unit. The take-up for the load element on the condensing unit can also be contacted by a load element included in the top roller assembly, which transmits the load force in the area of the take-up to the condensing unit. The condensing unit alternatively or additionally includes a magnet take-up and / or a magnet as a load element.

  In a further embodiment, it may be advantageous for the condensing unit to comprise at least one stop surface for positioning the condensing unit in the circumferential direction of the draft unit roller that can be brought into contact with the support surface. The stop surface for positioning in the circumferential direction prevents the condensing unit from being caught by the rotation of the draft unit roller. In particular, the condensation channel is precisely positioned with respect to the nip line of the top roller by the stop surface. The stop surface is advantageously supported on a component of the top roller assembly. If the condensing unit is designed for two adjacent draft units, it is advantageous for the stop surface for circumferential positioning to be centrally located between the two support surfaces for the draft unit roller .

  These and further objects, features and advantages of the present invention will become more readily apparent when the following detailed description is considered in conjunction with the accompanying drawings. Individual features of the various embodiments shown and described may be combined at will without departing from the scope of the invention.

It is a partial cross section enlarged side view of the draft unit of the textile machine containing a top roller assembly and a condensation unit.

It is the figure seen in the direction of arrow II of the condensation unit of FIG.

It is a partial cross section enlarged side view similar to FIG. 1 of the modification of a top roller assembly and a condensation unit.

It is the figure seen in the direction of arrow IV of the condensation unit of FIG.

FIG. 5 is a cross-sectional view of the condensation channel of the condensation unit cut along VV in FIG. 3.

It is a partial cross section enlarged side view similar to FIG. 1 of the modification of a top roller assembly and a condensation unit.

It is the figure seen in the arrow VII direction of the condensation unit of FIG.

  1 to 7 show a very schematic representation of a draft unit 1 of a textile machine. Draft unit 1 is designed as a double apron draft unit. The draft unit 1 is arranged in a spinning machine, preferably a ring spinning machine. The draft unit 1 drafts the fiber strand 2 made of short fibers and fed in the transport direction A to a desired fineness by a known method. The fiber strands 2 are drafted by a plurality of roller pairs arranged back and forth in the transport direction A, and the driving speed of the roller pairs increases in the transport direction. Of the roller pair, only the front roller pair 3 and 4 are shown, and the draft of the fiber strand 2 ends at the nip line 5. The roller pair including the roller pair 3 and 4 includes a drivable bottom roller 3 and a rotatable top roller 4 pressed against the bottom roller 3. The top roller 4 comprises a cot of soft rubber material and is pressed against the bottom roller 4 so that the fiber strand 2 is nipped at the nip line between the draft rollers 3 and 4. The top roller is attached to a top weighting arm 6 that can be opened and closed by swinging. Guide aprons 7 and 8 are arranged in a known manner on the roller pair upstream of the front roller pair 3, 4. Guide aprons 7 and 8 guide the fiber strands 2 in the main draft zone of the draft unit 1 extending from the nip line (not shown) of the roller pair looped by the guide aprons 7 and 8 to the nip line 5. The top roller 4 and other top rollers (not shown) are designed as twin top rollers. The twin top rollers include two top rollers assigned to adjacent draft units 1 and 1 ′ and having a joint axle 9. In the case shown, both top rollers of the twin top roller 4 are designed as loose boss top rollers. That is, both top rollers can freely rotate on the non-rotating axle 9. The top weighting arm 6 is arranged in the center between two adjacent draft units 1 and 1 ′ and supports the two top rollers 4 on the axle 9. The bottom roller 3 is designed as a continuous draft unit roller that extends over a plurality of adjacent draft units 1, 1 ′.

  In the case of the conventional draft unit 1, the already drafted fiber strand is fed in a drawing direction B to a twisting device (not shown) immediately downstream of the nip line 5, for example, a ring spindle, and a processed yarn 10 is formed. . In order to improve the quality of the yarn 10, in particular to reduce fuzz, the already drafted fiber strand 11 is fed via a condensation zone 12 immediately downstream of the nip line 5, which condenses and densifies the fiber strand 11. Sent. Already drafted fiber strands 11 are located on the peripheral surface 13 of the bottom roller 3 and are thereby fed through the condensation zone 12. In the condensation zone 12, the fiber strands 11 are fed through a condensation channel 14. The condensation channel 14 has a tunnel-like design and opens toward the bottom roller 3. The second top roller 15 is disposed on the bottom roller 3, and the second top roller 15 forms a nip line 16 together with the bottom roller 3, and the nip line 16 terminates the condensation zone 12. Since the fiber strands are fed in a drawing direction B to a twisting device (not shown), the agglomerated fiber strands are twisted into yarn 10 just downstream of the nip line 16. The nip line 16 forms a twist stop and ensures that the fiber strand 11 remains untwisted in the condensation zone 12.

  Two adjacent draft units 1 and 1 'top roller 15 are also supported on joint axle 17 to form a twin top roller. The twin top roller 15 and the twin top roller 4 form a top roller assembly 18. The top roller assembly 18 includes a base body 19 in which the two twin top rollers 4, 15 are received in their axles 9, 17. The top roller assembly 18 forms an independent unit that is attached to the top weighting arm 6 so that it can be replaced. The twin top rollers 4 and 15 are arranged so that the top rollers of the top roller assemblies 4 and 15 are not in contact with each other and the top rollers can be arranged on the joint draft unit roller 3. Arranged in the assembly 18. The axles 9 and 17 are advantageously aligned as parallel as possible in the base body 19. The axles 9 and 17 are advantageously received in the base without play, i.e. cannot move relative to the base 19. The attachment of the top roller assembly 18 to the top waiting arm 6 is such that the top roller assembly 18 is somewhat movable and can adjust itself when placed on the draft unit roller 3. It is advantageous that The top roller assembly 18 is advantageously attached via the axle 9. The top waiting arm 6 applies a load to the twin top roller 4 at the center of the axle 9. The attachment of the top roller assembly 18 to the top waiting arm 6 advantageously allows pendulum movement of the top roller assembly 18 about two imaginary axes extending at right angles to each other. Both imaginary axes are perpendicular to the axle 9.

  The top roller assembly 18 further includes a condensation unit 20 with a condensation channel 14. The condensation unit 20 is arranged in the area between the top rollers 4 and 15.

  Condensing unit 20 is shown in the various embodiments of FIGS. 1-7, described in further detail below. To label different embodiments, a figure number associated with reference numeral 20 is added. The condensing unit of FIGS. 1 and 2 has the reference number 120, the condensing unit of FIGS. 3 to 5 has the reference number 320, and the condensing unit of FIGS. 6 and 7 has the reference number 620. The reference number 20 is used when referring to the condensing unit of all embodiments, and in all other cases the reference number of a particular embodiment is presented.

  The condensing unit 20 is attached to the top roller assembly 18 so that a defined movement is possible, and at least one means 21 for attaching the condensing unit 20 to the top roller assembly 18 is provided. Various embodiments of the connecting means 21 are advantageous. In all cases, the connecting means 21 serve to prevent the condensation unit 20 from unintentionally falling off the top roller assembly 18 and to prevent the condensation unit 20 from moving uncontrollably with the top roller assembly 18. . The connecting means 21 enables the transmission of at least one force from the top roller assembly 18 to the condensation unit 20. The means 21 for attachment is attached on the base 19 of the top roller assembly 18 or on the part of the twin top rollers 4, 15.

  In the case of an old spinning machine including a conventional draft unit, the existing top roller 4 that has been operating so far can be removed from the draft unit 1 and replaced with a top roller assembly 18. The take-up 62 on the top weighting arm 6 for the top roller 4 can be adapted to the requirements of the top roller assembly 18. The existing spinning machine can thereby be modified by the draft unit 1 with the condensation zone 12 so that the yarn 10 with improved quality can be produced after the modification.

  A leaf spring 22 can be provided to ensure that the top roller assembly 18 and in particular the top roller 15 is pressed against the bottom roller 3. The leaf spring 122 can be attached to the top waiting arm 6 as shown in FIGS. 1 and 2, and its free end is pressed against the base 19 of the top roller assembly 18. A further advantageous embodiment is shown in FIG. The leaf spring 322 is attached to the base body 19 of the top roller assembly 18, and its free end is supported by the top waiting arm 6.

  In addition to the condensation channel 14 for the already drafted fiber strand 11, it may be advantageous to provide a guide surface 23 for the fiber strand 2 in the main draft zone. The guide surface 23 can improve the quality of the drafted fiber strand 11. The guide surface 23 is arranged upstream of the condensation channel 14 in the transport direction A up to the condensation unit 20. The guide surface 23 serves to guide the fiber strand 2 downstream of the guide aprons 7, 8 and upstream of the nip line 5.

  In an advantageous embodiment, the condensation unit 20 can be configured to include a guide surface 24 for the yarn 10. A guide surface 24 is disposed downstream of the condensation channel 14 and serves to guide the yarn 10 immediately downstream of the nip line 16. The guide surface 24 has the effect of reducing the contact area between the yarn 10 and the top roller 15, which in turn reduces the wear of the top roller cot.

  1 and 2 show a first advantageous embodiment of the condensing unit 120. The condensation unit 120 is designed as a multi-part component. The condensation unit 120 extends over two adjacent draft units 1 and 1 'and includes two condensation channels 14 and 14' for the already drafted fiber strands 11 and 11 'of the adjacent draft units 1 and 1'. The condensation unit 120 includes a support surface 131 for positioning the condensation unit 120 on the draft unit roller 3, which is arranged in the region of the condensation channel 14. A second support surface 132 is provided in the region of the condensation channel 14 ′. The condensing unit 120 includes a third support surface 133 for the draft unit roller 3 that is located away from the support surface 131 and the support surface 132 in the circumferential direction C of the bottom roller 3. For easy understanding, the circumferential direction C of the bottom roller 3 and the axial direction D of the bottom roller 3 are respectively represented by double-headed arrows in FIG. The drawing shown in FIG. 1 shows a view in the axial direction D. The support surface 132 is located away from the support surface 131 only in the axial direction D. In the circumferential direction C, the support surfaces 131 and 132 are in the same position.

  The condensation unit 120 includes three support surfaces 131, 132, and 133 that are located at a distance from one another, which ensures stable surface-to-surface contact of the condensation unit 120 on the bottom roller 3. This ensures that the condensing unit 120 is firmly positioned on the bottom roller 3 and does not wobble even when vibrations occur. In the axial direction D of the draft unit roller 3 that can be brought into contact with the contact surfaces 131, 132, and 133, the third support surface 133 is disposed at the center between the first support surface 131 and the second support surface 132. The

  The condensing unit 120 is designed as a single part with three support surfaces 131, 132, 133. All three support surfaces 131, 132, 133 and the condensation channels 14, 14 ′ are integrated into the base body 25 of the condensation unit 120. In doing so, the three support surfaces 131, 132, 133 do not lose their position relative to each other.

  The support surfaces 131 and 132 in the region of the condensation channels 14 and 14 'are concavely curved, which is adapted to the circumferential surface of the cylinder. This ensures that the tunnel-like condensation channel 14 is sealed against the bottom roller 3. Advantageously, the support surface 133 is formed either flat or convex. In the region of the draft units 1 and 1 ', the bottom roller 3 is usually provided with a groove on its outer surface 13. In the region between the draft units 1 and 1 ', the bottom roller 3 can be designed smoothly without grooves. When the support surface 133 is located in the non-grooved region of the draft unit roller 3, the support surface 133 is less worn.

  The condensing unit 120 is movably attached to the base 19 of the top roller assembly 18 via the connecting means 21. The connecting means 21 includes a sliding guide 50, a load element 27 and a fixing device 52. A helical pressure spring is provided as a load element 27. The condensing unit 120 includes a take-up 28 for the helical pressure spring 27. The helical pressure spring 27 is seated in the take-up 28 and is pressed against and supported by the base body 19. The load element 27 thereby generates a contact force against the support surfaces 131, 132, 133. The helical pressure spring 27 is arranged in the center between the support surfaces 131 and 132 in the axial direction D. For the purpose of increasing the contact force, the condensing unit 120 can include a magnet 29. When the magnet 29 is provided as a load element, depending on the application, the helical pressure spring 27 can be omitted completely. In another advantageous embodiment, the load element 27 operates pneumatically. Instead of the helical pressure spring 27, a pressure pad-like element (not shown) can be arranged in the take-up 28, which creates a contact force. The pad-like element is advantageously designed autonomously without a source of compressed air.

  The sliding guide 50 as part of the connecting means 21 ensures a defined mobility of the condensing unit 120. The condensing unit 120 includes a stop surface 51 for positioning the condensing unit 120 in the circumferential direction C of the draft unit roller 3. The condensing unit 120 tends to be dragged in the circumferential direction C by the rotation of the draft unit roller 3. The stop surface 51 is arranged on the base body 19 by a predetermined method. A stop surface 51 is arranged in the middle between the two condensation channels 14 and 14 '.

  The connecting means 21 includes a fixing element 52 that forms a fixing device for the condensation unit 120. The fixing element 52 prevents the condensing unit 120 from sliding off the sliding guide 50 when the top roller assembly 18 is pulled up from the bottom roller 3.

  In one embodiment of the condensation unit 120, the condensation unit 120 may include at least one guide surface 23 or 23 ′ for the fiber strand 2. A guide surface 23 in the form of a cylindrical guide element can guide the fiber strand 2 and, if necessary, be slightly deflected from the shortest imaginary connection line between the exit of the guide aprons 7, 8 and the nip line 5. Can do. In that case, the fiber strand 2 loops the portion of the convex guide surface 23. The guide surface 23 is disposed integrally with the condensing unit and can be included in the base body 25 as indicated by a broken line. In an advantageous embodiment of the invention (not shown), the guide surface 23 for the fiber strand 2 is designed as a tapered guide channel, which already exerts the condensation effect of the fiber strand 2 in the main draft zone.

  Also shown by the broken line is an expansion condensing unit 120 including additional guide surfaces 24, 24 'for the yarn 10. The guide surface 24 can be disposed on a wear resistant component that is secured to the substrate such that it cannot move relative to the substrate 25.

  Since the contact force of the fiber strand 2 and the yarn 10 with respect to the guide surfaces 23 and 24 is often greater than the contact force of the fiber strand 11 with respect to the condensation channel 14, in an embodiment not shown, the guide surface 23 and / or the guide surface 24 is It may be advantageous to place it on a wear resistant component connected to the substrate 25.

  3 to 5 show a second embodiment of the condensing unit 320. The condensing unit 320 is applicable to two adjacent draft units 1 and 1 ′. The condensing unit 320 comprises two condensing channels 14, 14 'for the already drafted fiber strands 11, 11'. The condensation unit 320 includes a first support surface 331 for positioning the condensation unit 320 on the draft unit roller 3, which is arranged in the region of the condensation channel 14.

  As can be seen from FIG. 5, the support surface 331 is divided into two parts by the condensation channel 14 and they are no longer in contact. Despite this fact, only one support surface 331 in the region of the condensation channel 14 will be referred to in accordance with the purpose of the present invention.

  The condensation unit 320 includes a second support surface 332 for the draft unit roller 3 that is arranged in the region of the condensation channel 14 ′. The condensing unit 320 includes two further support surfaces 333 and 334 located in the circumferential direction C away from the support surfaces 331 and 332. The distance in the circumferential direction C is advantageously between 7.5 mm and 9.5 mm in order to ensure a stable support for the condensation unit 320. The first support surface 331 is located away from the second support surface 332 only in the axial direction D of the draft unit roller 3 that can be brought into contact with the support surface. The third support surface 333 is located away from the fourth support surface 334 only in the axial direction D of the draft unit roller 3. When viewed in the axial direction D, the third support surface 333 and the fourth support surface 334 are separated by the same distance as the distance of the first support surface 331 from the second support surface 332. The condensing unit 320 includes a guide surface 23 for the fiber strand 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-like condensation channels that are open to the support surfaces 333 and 334. The guide surface 23 achieves condensation of the fiber strands 2 in the main draft zone of the draft unit 1. In addition to the lateral condensation of the fiber strand 2, the guide surface 23 can also deflect the fiber strand 2 somewhat from the draft surface if necessary, as shown in the case of the guide surface 23 in FIG. Viewed in the axial direction D of the draft unit roller 3 which can be brought into contact with the support surface, both guide surfaces 23, 23 'for the fiber strands 2, 2' are already drafted fiber strands 11, 11 Are separated by approximately the same distance as the two condensation channels 14, 14 'for'.

  The support surfaces 331, 332, 333 and 334 are concavely curved and all the curvature is adapted to the circumference of the joint cylinder. The term “cylinder” here refers to a geometric substrate that substitutes for the draft unit roller 3 that exists and operates later during manufacture of the condensing unit 320.

  In order to simplify the manufacture, the curved length of the support surface 331 is advantageously less than 10 mm and even less than 8 mm when viewed in all cross sections perpendicular to the center line of the support surface 331. The center line of the support surface 331 corresponds to the center line of the cylinder in which the curvature of the support surface 331 is adapted to its peripheral surface. The support surface 331 must be very precise so that the tunnel-like condensation channel 14 with the guide wall 46 directly in contact with the support surface 331 is in close contact with the bottom roller 3. If the required accuracy of the concave support surface 331 is ensured by the grinding process, the smallest possible support surface 331 reduces the cost of such a process. The remaining surfaces 332, 333, and 334 are designed similarly to the support surface 331. Instead of the condensation channel 14, a guide surface 23 is provided in the region of the support surfaces 333 and 334.

  The base body 25 of the condensing unit 320 includes four regions 341, 342, 343, and 344 protruding to one side, and support surfaces 331, 332, 333, and 334 are disposed therein. Each protruding region 341, 342, 343, 344 includes a condensation channel 14, 14 'or a guide surface 23, 23'. Depending on the stability requirements of the condensing unit 320, only the regions 341, 342, 343, 344 protruding to one side of the substrate 25 may not be sufficiently stable when subjected to a load, particularly when subjected to a load in the circumferential direction C. . To increase the stability of the condensing unit 320, the condensing unit 320 advantageously includes a “brace” or stabilizing component 57 represented by a dashed line (two-dot chain line) that interconnects the protruding regions 342 and 344. Can be. Protruding regions 341 and 343 can similarly be connected to “braces” or stabilizing components (not shown).

  In order to attach the condensing unit 320 to the top roller assembly, a connection means 21 in the form of a leaf spring 58 is provided. The leaf spring 58 is simultaneously a load element for generating a contact force on the support surfaces 331, 332, 333 and 334. The leaf spring 58 is fixed to the base 19 of the top roller assembly 18 by screws 59. The screw 59 can also fix the leaf spring 58 and the leaf spring 322 to the base body 19 together. In order to increase the contact pressure on the support surfaces 331, 332, 333, 334, the condensing unit 320 can include a magnet 29 represented by a broken line.

  The condensing unit 320 includes a take-up 28 for the leaf spring 58. The take-up 28 is preferably designed in the shape of a joint formed by a cylindrical pin 63 around which a leaf spring is curved. The leaf spring 58 and the joint 28 move the condensing unit 320 so that the support surfaces 331, 332, 333, and 334 are reliably positioned on the peripheral surface 13 when the top roller assembly 18 is placed on the bottom roller 3. Can be adjusted. A leaf spring 58 curved around the pin of the joint 28 prevents the condensing unit 320 from falling from the top roller assembly 18. As a result, the fixing device 52 is formed by the load element 58. Advantageously, the components of the condensation unit 320 include a load element 58. Thus, the leaf spring 58 is supplied with the condensing unit 320 and its loading force can be adjusted to the requirements of this particular condensing unit 320.

  The condensing unit 320 includes a stop surface 51 for positioning the condensing unit 320 in the circumferential direction C, and the stop surface 51 is advantageously arranged in the center between the support surfaces 331 and 332. In an embodiment not shown, it is possible to provide two stop surfaces 51 spaced apart from each other, which are arranged symmetrically between the two support surfaces 331 and 332. The stop surface 51 is supported by the base body 19 or the axle 17. The surface 61 for supporting the stop surface 51 on the base body 19 is designed such that it includes a constant radius around the centerline of the top roller axle 17. This consequently ensures a more accurate positioning of the condensing unit 320 when the top rollers 4, 15 and in particular the cot of the top roller 4 are reground if reground.

  In the embodiment of the condensing unit 320, two guide surfaces 24 and 24 'can be provided for the working yarns 10 and 10'. The holding device 25 of the condensing unit 320 is enlarged downstream of the condensing channels 14, 14 ′ for the purpose of receiving the guide surfaces 24, 24 ′, as indicated by broken lines. The guide surfaces 24, 24 ′ can be advantageously formed by bars 60 inserted in the base body 25. Bar 60 extends along adjacent draft units 1 and 1 '. The bar 60 is advantageously made from hardened steel. In an embodiment not shown, it may be advantageous to integrate the guide surfaces 24, 24 ′ into a single substrate 25. The region with the guide surfaces 24, 24 'can also include a support surface for the draft unit roller 3, and can be designed, for example, similar to the projecting regions 343,344.

  In an alternative embodiment not shown, the condensing unit 320 can be arranged to pivot on the base 19 of the top roller assembly 18. In FIG. 3, a cylinder pin for connecting the condensing unit 320 to the base 19 can be arranged as a connecting means in the area where the stop surface 51 is arranged. The condensation unit 320 can swivel around the center line of the pin. If the condensation unit 320 is secured to a pin, it may be sufficient for the condensation unit 320 to include only two support surfaces 331 and 332. The contact surfaces 333 and 334 in the area of the guide surfaces 23 and 23 'can be omitted if necessary. If the contact surfaces 333 and 334 are omitted, the guide surfaces 23 and 23 'can be advantageously formed directly by the outer circumference of the extended bar 56 applied in the same way as the bar 60 of the substrate 25. In that case, the hardened steel bar 56 forms a wear-resistant component attached to the holding device 25, for example. Alternatively, it may be advantageous to pivot the condensation unit 320 on the axle 17.

  A third embodiment of the condensing unit 620 is shown in FIGS. The condensation unit 620 includes a condensation channel for the already drafted fiber strand 11 assigned to only one draft unit 1. The condensation unit 620 includes a support surface 631 for positioning the condensation unit 620 on the draft unit roller 3 disposed in the region of the condensation channel 14. The support surface 631 is concavely curved and is fitted to the peripheral surface 13.

  The condensing unit 620 includes a further support surface 633 for the draft unit roller 3 located in the circumferential direction C away from the support surface 631. The support surface 633 can be flat or convex. The support surface 633 is disposed on the base body 25 of the condensation unit 620.

  In order to improve the bearing stability of the condensation unit 620, it may be advantageous to provide a third support surface 632 (shown in broken lines). The support surfaces 631, 632, 633 and the load element 27 are positioned so that the load element is within the virtual region of FIG. 7 formed by the shortest possible connection line between the center points of the support surfaces 631, 632, and 633. It is advantageous to arrange them relative to each other.

  The condensing unit 620 is designed for a single draft unit 1 only and as a result has the advantage that any faults occurring in the draft unit 1 are not transmitted to the adjacent draft unit 1 ′. However, as in the other embodiments, a top roller assembly 18 for two adjacent draft units 1, 1 'is provided. The top roller assembly 18 is arranged with two separate condensing units 620 and 620 ′, which are advantageously designed to be mirror-symmetric with respect to each other. Condensing units 620 and 620 'are disposed on top roller assembly 18 such that each is independently movable.

  Means 21 are provided for attaching the condensing unit 620 to the top roller assembly 18, which is as a sliding guide 50, a fixing element 52 as a fixing device, and a load element for generating contact forces against the support surfaces 631, 633. A helical compression spring 27 is included.

  In an alternative embodiment, the sliding guide 50 can be omitted. The condensing unit 620 is attached to the axle 17 of the twin top roller 15 by connecting means 21 'and can be swung around the axle 17 as shown by the broken line in FIG. Instead of the stop surface 51 as a part of the sliding guide 50, a stop surface 51 ′ is provided for positioning the condensation unit 620 in the circumferential direction C, and the outer stop surface 51 ′ is supported by the axle 17. In this case, the support surface 632 can be omitted, but the spring 27 and the securing device 52 are maintained as shown.

  In one embodiment, the condensing unit 620 can include a guide surface 23 for the fiber strand 2 and / or a guide surface 24 for the yarn 10. The guide surfaces 23 and 24 can be designed similarly to the embodiments described above in connection with other figures. It may also be advantageous to arrange the support surface 633 in the region of the guide surface 23.

  The base body 25 of the condensing unit 620 includes at least one region 641 protruding to one side, and a support surface 631 is disposed there. The protruding region 641 includes the condensation channel 14. A further protruding region 643 can be provided for the guide surface 23a. In doing so, the condensing unit 620 is located in the region between the draft units 1, 1 ′ where there is a larger space between the cots of the twin top rollers 4 and 15 on the opposite side of the protruding region 641 from the support surface 631. Means 21 for attaching can be arranged.

  In all the previous embodiments, the treatment of a single fiber strand 2 in one draft unit 1 has been described. However, it is possible in a known manner to draft a plurality of fiber strands, in particular two fiber strands, together in one draft unit 1. In the nip line 5 there are two fiber strands 11 that are already drafted and guided separately through the condensation zone 12 apart from each other. In that case, two condensation channels 14 that condense two adjacent fiber strands 11 are provided in the condensation zone 12. The two separately condensed fiber strands 11 are fed to a joint twisting device immediately downstream of the nip line 16 and twisted into a double spin twisted yarn. The number of condensing channels 14 and guide surfaces 23 in the described condensing unit 20 can of course be adapted to the production of such double spin twist yarns. Various forms of condensation channels 14 are known for the condensation of already drafted fiber strands 11. The selection of the shape of the condensation channel 14 and its guide wall 46 is made according to the application and the type of fiber strands to be treated in the draft unit.

It is stated that the various means 21 described above for attaching the condensing unit 20 to the top roller assembly 18 can of course be combined as required.

Claims (27)

  In a condensing unit for a drafting unit of a textile machine, comprising at least one condensing channel for already drafted fiber strands and first and second support surfaces for positioning the condensing unit on the drafting unit roller The condensation unit (20) is designed as a single unit with at least the first (31) and second (32; 33) support surfaces.   Condensing unit according to claim 1, wherein the condensing unit (20) comprises at least one guide surface (23) for the fiber strand (2).   The condensation unit (120; 320) comprises at least two condensation channels (14, 14 ') for the already drafted fiber strands (11, 11') of the adjacent draft unit (1, 1 ') The condensation unit according to claim 1 or 2, wherein the unit (120; 320) comprises first (131; 331) and second (132; 332) support surfaces in the region of the condensation channel (14, 14 ').   The condensing unit (20) comprises at least one further support surface (33) for the draft unit roller (3), said support surface (33) being formed unitarily with the condensing channel (20) and The condensation unit according to any one of claims 1 to 3, which is located away from the first (31) and second (32) support surfaces.   The condensation unit (20) includes at least three support surfaces (31, 32, 33), and the two support surfaces (31, 33) are separated from each other in the circumferential direction (C) of the draft unit roller (3). The draft unit roller (3) can be in contact with the support surfaces (31, 32, 33) and the two support surfaces (31, 32) of the draft unit roller (3) 5. Condensing unit according to claim 4, wherein the condensing units are located apart from each other in the axial direction (D) and whose draft unit rollers (3) can come into contact with the support surfaces (31, 32, 33).   The condensation unit (120; 320) comprises at least two condensation channels (14, 14 ') for the already drafted fiber strands (11, 11') of the adjacent draft unit (1, 1 ') The unit (120; 320) includes first (131; 331) and second (132; 332) support surfaces in the region of the condensation channel (14, 14 '), and the condensation unit (120; 320) is a draft unit. -Including at least one further support surface (133; 333; 334) located away from the first (131; 331) and second (132; 332) support surfaces in the circumferential direction (C) of the roller (3) The condensing unit according to claim 4 or 5.   The condensing unit (120) includes three support surfaces (131; 132; 133) for the draft unit roller (3), the first support surface (131) being the support surfaces (131, 132, 133) and Only the axial direction (D) of the draft unit roller (3) that can be contacted is located away from the second support surface (132), and the third support surface (133) is supported by the support surfaces (131, 132, 133) is located away from the first and second support surfaces (131, 132) in the circumferential direction (C) of the draft unit roller (3) that can be in contact with the third support surface (133), When viewed in the axial direction (D) of the draft unit roller (3) that can be brought into contact with the support surfaces (131, 132, 133), it is approximately in the middle between the first (131) and second (132) support surfaces. Placed in the Condensing unit as claimed in any one of Motomeko 4-6.   Condensing unit according to any of claims 4 to 6, wherein the condensing unit (320) comprises four support surfaces (331, 332, 333, 334), the support surfaces being located apart from each other.   The first support surface (331) can be brought into contact with the support surfaces (331, 332, 333, 334) only from the second support surface (332) in the axial direction (D) of the draft unit roller (3). A fourth support is provided only in the axial direction (D) of the draft unit roller (3), which is located apart and the third support surface (33) can contact the support surfaces (331, 332, 333, 334). A third (333) and a third (333) when viewed in the axial direction (D) of the draft unit roller (3) located away from the surface (334) and in contact with the support surface (331, 332, 333, 334) 9. The condensing unit according to claim 8, wherein the fourth (334) support surfaces are located at approximately the same distance from one another as the first (331) and second (332) support surfaces.   Condensing unit according to claim 8 or 9, wherein the condensing unit (320) comprises at least one guide surface (23) for the fiber strand (2) in the region of the third and fourth support surfaces (333, 334). .   The condensing unit (120; 320) has two condensing channels (14, 14 ') for the already drafted fiber strands (11, 11') and two guide surfaces for the fiber strands (2, 2 ') The condensing unit according to any one of claims 4 to 10, comprising (23, 23 ').   The axis of the draft unit roller (3) in which the two guide surfaces (23, 23 ') for the fiber strands (2, 2') can be brought into contact with the support surfaces (331, 332, 333, 334) 12. Condensing unit according to claim 11, wherein the condensing unit has approximately the same distance between the two condensing channels (14, 14 ') for the already drafted fiber strands (11, 11') in the direction (D).   Condensing unit according to any of the preceding claims, wherein the support surface (31) is concavely curved, whereby the curvature is adapted to the circumferential surface of the cylinder.   14. Condensing unit according to claim 13, wherein at least two support surfaces (31, 33) are concavely curved, whereby all the curvatures are adapted to the peripheral surface of the common cylinder.   Stop surface (51) for positioning the condensing unit (20) in the circumferential direction (C) of the draft unit roller (3) with which the condensing unit (20) can come into contact with the support surfaces (31, 33) The condensing unit according to claim 1, comprising:   16. The condensing unit (20) according to any of the preceding claims, wherein the condensing unit (20) comprises at least one take-up (28) for a load element (27; 29; 58) that creates a contact force on the support surface (31; 32). Condensation unit according to crab.   Condensing unit according to any of the preceding claims, wherein the condensing unit (20) comprises at least one load element (29:58) that produces a contact force on the support surfaces (31, 33).   18. Condensing unit according to claim 17, wherein the load element is a spring (58) attached to the condensing unit (320).   19. Condensing unit according to claim 17 or 18, wherein the load element is a magnet (29).   The condensation unit according to any of the preceding claims, wherein the distance in the circumferential direction (C) between the two support surfaces (31, 33) is greater than 5 mm, in particular 7.5 mm to 9.5 mm.   Circumferential direction (C) of the draft unit roller (3) in which the support surface (31, 33) of the condensation unit (20) can be in contact with the support surface (31, 33) of less than 14 mm, in particular less than 8 mm The condensing unit according to claim 1, having a length of   The concave support surface (31) of the condensing unit (20) is less than 14 mm, in particular less than 8 mm, when viewed in a cross section perpendicular to the center line of the concave support surface (31). Condensation unit according to crab.   23. The condensation unit (20) comprises means (21) for attaching the condensation unit (20) to a top roller assembly (18), in particular a substrate (19) of the top roller assembly (18). The condensation unit according to any one of the above.   24. Condensing unit according to any of the preceding claims, wherein the condensing unit (20) comprises a substrate (25), the substrate (25) comprising at least two support surfaces (31; 32; 33).   25. Condensing unit according to any of the preceding claims, wherein the condensing unit (20) and / or the substrate (25) consists of a die cast or injection molded part.   26. Condensing unit according to any of the preceding claims, wherein the condensing unit (20) and / or the substrate (25) is made of a synthetic material. 27. A top roller assembly for a drafting unit of a textile machine comprising a substrate and two twin top rollers received in the substrate, wherein the top roller assembly (18) is any of claims 1 to 26. A top roller assembly comprising at least one condensation unit (20) according to claim 1, wherein the condensation unit (20) is mounted to the top roller assembly (18) in a movable manner.

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