Air-jet spinning machine and drafting system unit for spinning unit of air-jet spinning machine

Abstract

This invention relates to an air-jet spinning machine and a drafting system unit for a spinning unit of the air-jet spinning machine for producing fine yarns or rovings from a supplied fiber strip. The drafting system unit comprises: at least one front roller pair, consisting of a front top roller located on a load carrier and a driven front bottom roller located on a bottom roller carrier, forming a clamping yarn; and a bearing element arranged on the bottom roller carrier for movably supporting an air-jet spinning nozzle. To provide a drafting system unit for a spinning unit of an air-jet spinning machine and an air-jet spinning machine having a reliable pivotable air-jet spinning nozzle that can be easily released from the bottom roller carrier when necessary, the bottom roller carrier includes a bearing element with a free end through which the air-jet spinning nozzle can be received. The bearing element forms a pivot axis for pivoting the air-jet spinning nozzle between an operating position and a second position spaced apart from the operating position, wherein the bearing element is connected to a portion of the bottom roller carrier spaced apart from the free end.

Description

Technical Field

[0001] This invention relates to a drafting system unit for a spinning unit of an air-jet spinning machine for producing fine yarns or rovings from a supplied fiber strip, the drafting system unit comprising:

[0002] - At least one front roller pair, the at least one front roller pair consisting of a front top roller located on a load carrier and a driven front bottom roller located on a bottom roller carrier, forming a clamping line; and

[0003] - A bearing element arranged on the bottom roller bracket for movably supporting the air-jet spinning nozzle. Background Technology

[0004] Drafting system units for textile machines are known in various embodiments of the prior art. They are used to stretch or draft fiber strips, resulting in a reduction in fiber cross-section. During the drafting process, the fibers must be displaced relative to each other as uniformly as possible in order to obtain a fiber strip that is as uniform as possible.

[0005] To stretch the fiber strip, a drafting system unit typically has multiple pairs of rollers arranged sequentially, adjacent to each other and clamping the fiber strip extending between them. In this case, a pair of rollers typically consists of a driven bottom roller arranged on a bottom roller carrier and a bottom roller abutting against the bottom roller and arranged on a pivotable load carrier, the top roller being rotatably held by the load carrier. Drafting of the fiber strip is achieved by increasing the peripheral speed of the roller pair through the drafting system unit in the direction of transport defined by the rotational direction of the roller pairs.

[0006] In the case of air-jet spinning using a spinning machine for spinning fine yarns, the fiber strip is typically stretched according to the desired yarn fineness to be achieved by means of a drafting system unit and then fed into the air-jet spinning nozzle of the air-jet spinning device. In the air-jet spinning device, the outer fibers of the fiber strip are wound around the inner core fibers of the fiber strip by means of a vortex airflow generated by the air-jet spinning nozzle, thereby forming wrapped fibers that are crucial for the desired yarn strength. The yarn thus formed is finally drawn out through the extraction channel of the air-jet spinning device and wound onto, for example, a tube.

[0007] In known drafting system units, air-jet spinning nozzles are arranged on the bottom roller support of the drafting system unit, downstream of the front roller pair in the fiber conveying direction. To arrange the air-jet spinning nozzles on the bottom roller support, it is known to use a retainer that connects to and is adapted to the bottom roller support. The air-jet spinning nozzles are pivotally arranged on this retainer, allowing adjustment between an operating position and a maintenance position. In the operating position, the fiber strip exiting the front roller pair is fed into the air-jet spinning nozzles. In the maintenance position, for example, it is possible to easily clean the area between the spinning nozzles and the front roller pair. To completely remove the spinning nozzles from the bottom roller support, for example for maintenance work, in holders known in the prior art, the holder on which the spinning nozzles are arranged must be removed from the bottom roller support, for example by releasing the corresponding threaded connection that secures the holder to the bottom roller support. In this case, the air-jet spinning nozzle is typically pivotally mounted on the cage via two opposing support points, which also have high positional tolerances.

[0008] In the case of air-jet spinning using a roving frame for spinning roving, a fiber sliver (i.e., a so-called drawing frame sliver) produced, for example, by a drawing frame is fed into the roving frame. The roving frame includes, for example, an air-jet spinning device as described above, wherein the size and flow conditions of the air-jet spinning device for producing roving are suitably adapted to the air-jet spinning device for producing fine yarn. The operating mode of this air-jet spinning device for a roving frame for producing roving is similar to the operating mode of the air-jet spinning device for an air-jet spinning frame for producing fine yarn. Summary of the Invention

[0009] Therefore, the object of the present invention is to provide a drafting system unit for a spinning unit of an air-jet spinning machine and an air-jet spinning machine having a reliable pivotable air-jet spinning nozzle that can be released from the bottom roller carrier in a simple manner (especially without tools) when necessary.

[0010] This invention achieves this objective through a drafting system unit and an air-jet spinning machine.

[0011] According to a preferred embodiment, the air-jet spinning machine can be a spinning machine designed to produce fine yarns that can be wound onto a spool tube to form a spool, particularly a so-called cross-wound spool.

[0012] According to another preferred embodiment, the air-jet spinning machine can be a roving machine for producing rovings, as described, for example, at the beginning. In such roving machines, the air-jet spinning device is designed such that the produced roving has a reversible protective twist. It is known that such a reversible protective twist is characterized by the fact that the roving can still be stretched for further processing, such as, for example, on a ring spinning machine, where the introduced, imparted twist can be dissolved again if necessary. The reversible protective twist is generally achieved in such a way that the fiber strip fed to the air-jet spinning device is at least partially endowed with true twist by the air-jet spinning device. This should be understood to mean that at least some fibers in the supplied fiber strip are endowed with true twist during the air-jet spinning process, i.e., by means of the rotation achieved by the airflow generated in the air-jet spinning device.

[0013] The drafting system unit according to the invention is characterized in that the bottom roller carrier includes a bearing element having a free end, through which an air-jet spinning nozzle can be received, and the bearing element forms a pivot axis for pivoting the air-jet spinning nozzle between an operating position and at least one second position spaced apart from the operating position, wherein the bearing element is connected to the bottom roller carrier by a portion spaced apart from the free end. The second position is a position farther from the front roller than the operating position, which defines the first position. For example, the second position may define a maintenance position in which maintenance activities as described by example can be performed. Alternatively, the second position may be a position different from the maintenance position. In particular, the second position may be between the operating position and the maintenance position, or a position farther from the front roller relative to the maintenance position. In the latter preferred embodiment, the second position is disposed downstream of both the operating position and the maintenance position in a direction extending from the front roller. The second position may also preferably define an end position of the pivotable air-jet spinning nozzle, in which the air-jet spinning nozzle may have the maximum possible distance to the front roller.

[0014] The portion for connection with the bottom roll carrier is preferably the end of the bearing element opposite to the free end. Therefore, the bearing element can be formed in a defined and cost-effective manner. Alternatively, this portion can be located between the free end and the other end of the bearing element opposite to that free end (particularly the free end). This facilitates the possibility of further arranging other components on the bearing element if necessary. The connection of the bearing element to the bottom roll carrier via this portion is substantially flexible. According to a preferred embodiment, the bottom roll carrier has a fastening receptacle designed to receive a portion of the bearing element. More preferably, at least the fastening receptacle or a portion of the bearing element is designed to allow the bearing element to be secured to the bottom roll carrier. This can be achieved, for example, by means of screw fastening or clamping, which is further preferably spring-loaded.

[0015] Embodiments of the drafting system unit according to the invention allow for the simple arrangement of or removal of the air-jet spinning nozzle from the bottom roller carrier. To arrange the air-jet spinning nozzle on the bottom roller carrier, it is simply pushed onto the bearing element via the free end having an opening adapted to the free end of the bearing element. Removing the air-jet spinning nozzle from the bottom roller carrier can then be achieved by simply sliding the air-jet spinning nozzle downwards from the bearing element via the free end. Thus, the bearing element being free at one end allows for simple assembly and disassembly of the air-jet spinning nozzle on the bottom roller carrier, and also provides the possibility of pivoting the air-jet spinning nozzle about a pivot axis formed by the bearing element between an operating position and a second position spaced apart therefrom. Furthermore, the single-sided bearing of the bearing element on the bottom roller carrier allows for particularly precise and clearance-free alignment of the pivot axis relative to the bottom roller carrier.

[0016] To secure the position of the air-jet spinning nozzle onto the bearing element in the advance direction of the nozzle (particularly along the pivot axis), according to a preferred embodiment of the invention, the bearing element has a stop element in the portion opposite the free end. The use of the stop element (e.g., preferably at least partially or more preferably completely surrounding the pivot axis or a shoulder or flange of the bearing element) allows for precise positioning of the air-jet spinning nozzle onto the bearing element in the advance direction, enabling the nozzle to be optimally arranged in the operating position relative to the preceding roller pair. Therefore, separate alignment is not required.

[0017] According to another preferred embodiment of the invention, the air-jet spinning nozzle is fixed to the bearing element in a position-fixed manner. Here, the position fixing of the air-jet spinning nozzle can be substantially freely chosen. In particular, to fix the position of the air-jet spinning nozzle to the bearing element, the bearing element is designed to receive a position-fixing element in the region of its free end. The use of the position-fixing element (e.g., by means of screw fastening or clamping, which is further preferably formed in a spring-loaded manner) reliably ensures that the air-jet spinning nozzle will not slip off the bearing element in an undesirable manner. For example, the position-fixing element can be a screw that can be screwed onto the free end of the bearing element, a retaining ring that can be arranged on the free end of the bearing element, or especially a spring-loaded pressure member. Spring-loaded pressure members are generally known and offer advantages over conventional clamping screws, namely, that the tip of the pressure member is designed to be movable in a spring-loaded manner. Once the spring force acting as a clamping force on the tip of the pressure member is overcome, the tip shifts or displaces into the pressure member along the direction of the pressure member, thereby displacing the component or air-jet spinning nozzle held by the spring-loaded pressure member on the bearing element. Alternatively or additionally, the bearing element and the carrier supporting the air-jet spinning nozzle that can be pushed onto the bearing element can preferably have a tongue-and-groove retaining mechanism, which acts similarly to a preferred embodiment with a spring-loaded pressure member, engaging or disengaging in the direction of propulsion of the air-jet spinning nozzle when a limiting force in the propulsion direction is overcome. In contrast to the spring-loaded pressure member, no spring-loaded pressure member, such as a tip, is provided. Further alternatively or additionally, a locking lever can be provided, arranged to rotate laterally in the direction of propulsion on the bottom roller carrier, to secure the air-jet spinning nozzle after it has been positioned on the bearing element, thereby preventing movement in the opposite direction of propulsion. The preferred use of the retaining ring as a position-fixing element is characterized by, on the one hand, ensuring reliable fixation of the air-jet spinning nozzle's position on the bearing element, and on the other hand, allowing for simple and quick removal when necessary, so that the air-jet spinning nozzle can then be easily removed from the bearing element.

[0018] The embodiment of the bearing element forming the pivot axis for the air-jet spinning nozzle is largely free to choose. It can also be designed as an integral part of the bottom roller carrier. According to a preferred embodiment of the invention, the bearing element is arranged on the pivot axis bracket of the bottom roller carrier. This preferred embodiment of the invention provides the possibility that, if necessary, the bearing element can be removed from the bottom roller carrier and replaced with a new bearing element, for example, to enable the use of an alternative air-jet spinning nozzle on the drafting system unit. According to a particularly preferred embodiment of the invention, the bearing element is formed by a bearing pin, which is held in a fixed manner by the pivot axis bracket and is further preferably pressed or screwed into the pivot axis bracket. In particular, the use of a pressed or screwed bearing pin ensures a high degree of positional safety with very low bearing tolerances, making it possible to ensure, in a particularly reliable manner, optimal positioning of the air-jet spinning nozzle relative to the fiber strip emerging from the front roller pair. Alternatively, the bearing pin can also be secured to the bottom roller carrier or pivot axis bracket via other types of fastening (such as, for example, via clamping or latching devices, locking pins, etc.). For the type of fastener, it is important to select a type of fastener that allows the bearing pin to be securely mounted on the bottom roller bracket or pivot bracket.

[0019] The arrangement of the bearing elements relative to the front roller pair is also largely flexible. According to a preferred embodiment of the invention, the bearing elements are arranged such that the air-jet spinning nozzle can pivot between an operating position and at least a second position along a direction of movement extending transversely to (more preferably orthogonally to) the axis of rotation of the front roller. More preferably, the bearing elements are arranged such that the air-jet spinning nozzle can pivot tangentially to the front bottom roller between the operating position and the second position. According to this further preferred embodiment of the invention, the pivot axis extends parallel to the clamping line of the front roller pair, and the pivot axis, the axis of rotation of the front bottom roller, and the axis of rotation of the front top roller lie in a common plane, i.e., across a common plane. Through a preferred or further preferred embodiment of the invention, the spinning nozzle can be displaced in the direction of movement from the operating position to at least a second position, which can be a maintenance position and / or an end position different from the operating position for pivoting the air-jet spinning nozzle, which facilitates the dissolution of thickeners in the yarn. In particular, the further preferred embodiment of tangential pivoting of the air-jet spinning nozzle relative to the front roller contributes to further improvement in the dissolution of thickeners in the yarn.

[0020] To facilitate the assembly of the air-jet spinning nozzle onto the bearing element, according to another preferred embodiment of the invention, a guide element is provided, arranged on the bottom roller carrier, having a guide surface extending parallel beyond the free end and spaced at a distance from the bearing element. The guide element acts as a stop element when the air-jet spinning nozzle is mounted on the bottom roller carrier, making it easier for the machine operator to arrange the nozzle onto the bearing element. The air-jet spinning nozzle is applied by the machine operator to the guide surface adjacent to the free end of the bearing element. Upon contact with the guide surface, the air-jet spinning nozzle can then be displaced in a direction toward the end of the bearing element opposite the free end by movement parallel to the guide surface orientation. Therefore, the spinning nozzle can be pushed onto the bearing element in a simple manner. The guide surface serves as an assembly aid that enables the air-jet spinning nozzle to be assembled onto the bottom roller carrier particularly easily and quickly.

[0021] The present invention also achieves this objective by means of an air-jet spinning machine for producing fine yarns or rovings from supplied fiber strips, the air-jet spinning machine having at least one drafting system unit according to the present invention or preferably further developed therein.

[0022] The air-jet spinning machine according to the invention has the following advantages: if necessary, the air-jet spinning nozzle can be removed from the spinning unit in a particularly simple and convenient manner. Therefore, maintenance and cleaning can be carried out conveniently in a short time, resulting in minimal downtime during maintenance. Attached Figure Description

[0023] Exemplary embodiments of the invention are explained below with reference to the accompanying drawings, wherein the same reference numerals are used for the same functional elements. In the drawings:

[0024] Figure 1 This is a schematic perspective view of a portion of the drafting system unit, in which the air-jet spinning nozzle is separated from the bearing element;

[0025] Figure 2 yes Figure 1 A schematic perspective view of a portion of the drafting system unit, in which the air jet spinning nozzle is pushed against the bearing element in the maintenance position;

[0026] Figure 3 yes Figure 1 A schematic perspective view of a portion of the drafting system unit, in which the air-jet spinning nozzles are arranged in the operating position;

[0027] Figure 4 yes Figure 1 A schematic perspective view of a portion of the drawing system unit; and

[0028] Figure 5It is a schematic perspective view of a portion of a drafting system unit according to another embodiment, wherein the air-jet spinning nozzles are arranged in the operating position. Detailed Implementation

[0029] exist Figure 1 The perspective cross-sectional view of the drafting system unit 1, shown in the schematic diagram, illustrates the connection area of ​​the air-jet spinning nozzle 2 in the region of the front bottom roller 3 and on the bottom roller bracket 4 according to one embodiment. Figure 1 In the middle, the air-jet spinning nozzle is separated from the bottom roller bracket 4.

[0030] For placement on the bottom roller bracket 4, the air-jet spinning nozzle 2 has a bracket 13 with a bearing element receiving portion 14 extending through the bracket 13. To position the air-jet spinning nozzle 2 on the bottom roller bracket 4, the bearing element receiving portion 14 is pushed against the bearing element 5, which is designed as a bearing pin, in the direction of the bearing element bracket 10 that carries the bearing pin, until it reaches... Figure 2 The push-fit position on bearing pin 5 is shown.

[0031] exist Figure 2 In the maintenance position of the air-jet spinning nozzle 2 shown (which, according to an exemplary embodiment, is the second position), the air-jet spinning nozzle is fully pushed onto the bearing pin via the free end 6 of the bearing pin, wherein the end face of the bracket 13 facing the bearing element bracket 10 abuts against the circumferential stop element 7 of the bearing pin. To secure the air-jet spinning nozzle 2 in the pushed position on the bearing pin, a retaining ring 9 is used, which is inserted into a groove 8 extending around the bearing pin in the region of the free end 6 of the bearing pin.

[0032] To simplify the arrangement of the air-jet spinning nozzle 2 on the bottom roller bracket 4, a guide element 11 is arranged on the bottom roller bracket 4. The guide surface 12 of this guide element extends parallel to the bearing pin beyond its free end 6. For assembling the air-jet spinning nozzle 2, in... Figure 1 In the position shown, the air-jet spinning nozzle is brought into contact with the guide surface 12 via the bracket 13, and while abutting against the guide surface, it is pushed against the bearing pin via the free end 6 of the bearing pin until the bracket 13 abuts against the stop element 7 of the bearing pin with its end face facing the bearing element bracket 10 (see...). Figure 4 ).

[0033] The air jet spinning nozzle 2 can be from Figure 2 The maintenance position shown pivots about the bearing pin or about the pivot axis formed by the bearing pin. Figure 3 The operating position is shown and then returned, wherein the air-jet spinning nozzle 2 in the operating position is arranged downstream of the clamping line formed by the front bottom roller 3 and the front top roller (not shown) for receiving the supplied fiber strip in the fiber strip conveying direction.

[0034] Figure 5 Another embodiment is shown, in which, in contrast to the previous exemplary embodiment, the advance direction of the air-jet spinning nozzle 2 is reversed. A stop element 7 of the bearing pin is arranged at the right end of the bearing pin along the advance direction, thereby allowing the air-jet spinning nozzle 2 to be advanced from the left side via the free end 6 of the bearing pin arranged on the left. A guide element 11 is arranged at a corresponding position on the bottom roller bracket 4. In the pushed-in state, the bracket 13 of the air-jet spinning nozzle 2 has an end portion 15 on the side facing the free end 6 of the bearing pin, which is pushed onto the bearing pin and has a hole for receiving a pressure member 16 (particularly a spring-loaded pressure member). According to this exemplary embodiment, the pressure member 16 is screwed into the hole 15 and its tip engages in a recess formed on the bearing pin (coinciding with the tip of the pressure member 16 and not shown), wherein, according to the exemplary embodiment, this recess is formed as a circumferential groove 8 on the bearing pin. Therefore, the air-jet spinning nozzle 2 can be fixed to the bearing pin in a positionally fixed manner. To disassemble the air-jet spinning nozzle 2, the pressure member 16 is released in a defined manner in the loosening direction, resulting in the air-jet spinning nozzle 2 becoming freely movable in the advancing direction. The use of such pressure members 16 (especially spring-loaded pressure members) simplifies the assembly and disassembly of the air-jet spinning nozzle 2 from the bearing pin.

[0035] List of reference numerals

[0036] 1. Drafting System Unit

[0037] 2. Air jet spinning nozzle

[0038] 3. Front bottom roller

[0039] 4 Bottom roller bracket

[0040] 5. Bearing components

[0041] 6 Free end

[0042] 7. Stopping elements

[0043] 8 grooves

[0044] 9. Snap rings

[0045] 10 Bearing component bracket

[0046] 11. Guide elements

[0047] 12 guide surfaces

[0048] 13 brackets

[0049] 14 Bearing component housing

[0050] 15. End portion of the bracket

[0051] 16 Pressure components

Claims

1. A drafting system unit (1) for a spinning unit of an air-jet spinning machine, the air-jet spinning machine being used to produce fine yarn or roving from a supplied fiber strip, the drafting system unit comprising: - At least one front roller pair, said at least one front roller pair consisting of a front top roller located on a load carrier and a driven front bottom roller (3) located on a bottom roller carrier (4) and forming a clamping line; and - Bearing element (5), which is arranged on the bottom roller bracket (4) for movably supporting the air jet spinning nozzle (2). Its features are, The bottom roller support (4) includes a bearing element (5) having at least one free end (6), through which the air-jet spinning nozzle (2) can be received, wherein the bearing element (5) forms a pivot axis for pivoting the air-jet spinning nozzle (2) between an operating position and at least one second position spaced apart from the operating position, wherein the bearing element (5) is connected to a portion of the bottom roller support (4) spaced apart from the free end (6), wherein a guide element (11) is arranged on the bottom roller support (4), The guide element has a guide surface (12) that extends parallel beyond the free end (6) and is a certain distance from the bearing element (5), wherein the air-jet spinning nozzle (2) contacts the guide surface (12) via a nozzle bracket (13), and when the nozzle bracket (13) abuts against the guide surface (12), it is pushed onto the bearing element (5) via the at least one free end (6) of the bearing element (5) until the nozzle bracket (13) abuts against a portion of the bearing element (5).

2. The drawing system unit (1) according to claim 1, characterized in that, The second position is a maintenance position or a position different from the maintenance position.

3. The drawing system unit (1) according to claim 1 or 2, characterized in that, The bearing element (5) has a stop element (7) in the portion opposite to the free end (6).

4. The drawing system unit (1) according to claim 1 or 2, characterized in that, The bearing element (5) is designed in the region of the free end (6) to receive a position fixing element.

5. The drawing system unit (1) according to claim 1 or 2, characterized in that, The bearing element (5) is arranged on the pivot bracket (10) of the bottom roller bracket (4).

6. The drawing system unit (1) according to claim 5, characterized in that, The bearing element (5) is formed by a bearing pin that is held in place by the pivot bracket (10).

7. The drawing system unit (1) according to claim 1 or 2, characterized in that, The bearing element (5) is arranged such that the jet spinning nozzle (2) can pivot between the operating position and at least the second position along a direction of movement extending transversely to the rotation axis of the driven front bottom roller (3).

8. The drawing system unit (1) according to claim 5, characterized in that, The bearing element (5) is formed by a bearing pin that is pressed or screwed into the pivot bracket (10).

9. The drawing system unit (1) according to claim 1 or 2, characterized in that, The bearing element (5) is arranged such that the air-jet spinning nozzle (2) can pivot between the operating position and at least the second position along a direction of movement extending orthogonal to the rotation axis of the driven front bottom roller (3).

10. An air-jet spinning machine for producing fine yarns or rovings from a supplied fiber strip, Its features are, A spinning unit having a drafting system unit (1) according to any one of claims 1 to 9.

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