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EP-4735677-A1 - DEVICE FOR A TEXTILE MACHINE COMPRISING A DRAWING UNIT, AND METHOD FOR OPERATING A TEXTILE MACHINE COMPRISING THE DRAWING UNIT

EP4735677A1EP 4735677 A1EP4735677 A1EP 4735677A1EP-4735677-A1

Abstract

The invention relates to a device for a textile machine, to a method for operating a textile machine, and to a textile machine. The device has a drawing unit (1) for drawing at least one sliver (2), a nonwoven nozzle (3) which is arranged at the outlet of the drawing unit (1) for combining the drawn slivers (4), and a base frame (5), wherein the nonwoven nozzle (3) is held on the base frame (5) in a stationary manner. The drawing unit (1) has at least one inlet roller pair (14) and an outlet roller pair (18). The inlet roller pair (14) has a lower roller (16) and a pressure roller (17), and the outlet roller pair (18) has a lower roller (20), a pressure roller (21), and a deflecting roller (22). A clamping point (42) is formed between the deflecting roller (22) and the lower roller (20) of the outlet roller pair (18), and an adjustment function is provided for a path (41) between the clamping point (42) and the nonwoven nozzle (3).

Inventors

  • KRIEGLER, ALBERT
  • SCHMOLKE, WERNER
  • GRABMAIR, MARTIN

Assignees

  • Rieter AG

Dates

Publication Date
20260506
Application Date
20240620

Claims (15)

  1. 1 . Device for a textile machine, wherein the device comprises a drafting device (1) for drawing at least one fiber sliver (2), a fleece nozzle (3) arranged at the output of the drafting device (1) for gathering the drawn fiber sliver (4), and a base frame (5), wherein the fleece nozzle (3) is held stationary on the base frame (5), wherein the drafting device (1) comprises at least one input roller pair (14) and one output roller pair (18), wherein the input roller pair (14) comprises a lower roller (16) and a pressure roller (17), and wherein the output roller pair (18) comprises a lower roller (20) and a pressure roller (21) and a deflection roller (22), and wherein a clamping point (42) is formed between the deflection roller (22) and the lower roller (20) of the output roller pair (18), characterized in that an adjustment of a travel path (41) for the fiber band (2) is provided between the clamping point (42) and the fleece nozzle (3).
  2. 2. Device according to claim 1, characterized in that the drafting device (1) is fastened to a drafting device carrier (6) held on the base frame (5), wherein the adjustment of the travel path (41) is provided by setting a distance (7) between the drafting device carrier (6) and the fleece nozzle (3) by adjusting the drafting device carrier (6) relative to the base frame (5), or that the drafting device (1) is fastened to the base frame (5), wherein the deflection roller (22) of the output roller pair (18) is held via a bearing arm (43), and wherein the adjustment of the travel path (41) is provided by a rotary movement (45) of the bearing arm (43) about a rotation axis (44) of the lower roller (20) of the output roller pair (18), or that the drafting system (1) is fastened to a drafting system carrier (6) held on the base frame (5) by a pivot axis (46), wherein an adjustment of the travel path (41) is provided by a pivoting movement (47) of the drafting system carrier (6) about the pivot axis (46).
  3. 3. Device according to claim 2, characterized in that the drafting system support (6) or the base frame (5) or the rotation axis (44) of the lower roller (20) of the output roller pair (18) or the pivot axis (46) is provided with a scale (8) for indicating the position of the drafting system (1).
  4. 4. Device according to claim 2 or 3, characterized in that the drafting system support (6) to the base frame (5) or the bearing arm (43) of the deflection roller (22) to the axis of rotation (44) of the lower roller (20) or the drafting system support (6) in the pivot axis (46) have a locking device (9).
  5. 5. Device according to one or more of the preceding claims, characterized in that a manual adjustment of the travel path (41) is provided.
  6. 6. Device according to one or more of the preceding claims, characterized in that a drive (37) is provided for adjusting the travel path (41).
  7. 7. Device according to one or more of the preceding claims, characterized in that the fleece nozzle (3) is rotatably held on the base frame (5).
  8. 8. Textile machine with a device according to one or more of the preceding claims, characterized in that a control (38) is provided for the automatic adjustment of the travel path (41) between the clamping point (42) and the fleece nozzle (3) when changing the operating mode of the drafting system (1) or the properties of the fiber sliver (2).
  9. 9. Textile machine according to claim 8, characterized in that an input of at least one of the following factors is provided in the control (38): fiber material, fiber length, fiber weight, degree of parallelization of the fibers, production speed.
  10. 10. Textile machine according to claim 8 or 9, characterized in that the control (38) is connected to a monitoring of the drafting system (1) and a transmission of operating data to the control (38) is provided.
  11. 11. Textile machine according to one or more of claims 8 to 10, characterized in that the textile machine is connected to a central control and a specification of the travel path (41) is provided by the central control.
  12. 12. Method for operating a textile machine with a drafting system (1) for drawing at least one fiber sliver (2) and with a fleece nozzle (3) arranged at the output of the drafting system (1) for gathering the drawn fiber sliver (4), and with a base frame (5), wherein the fleece nozzle (3) is held stationary on the base frame (5), wherein the drafting system (1) has at least one input roller pair (14) and one output roller pair (18), wherein the input roller pair (14) has a bottom roller (16) and a pressure roller (17), and wherein the output roller pair (18) has a bottom roller (20) and a pressure roller (21) and a deflection roller (22), and wherein between the deflection roller (22) and the bottom roller roller (20) of the output roller pair (18) a clamping point (42) is formed, characterized in that a running path (41) between the clamping point (42) and the fleece nozzle (3) is adjusted.
  13. 13. Method according to claim 12, characterized in that the drafting system (1) is fastened to a drafting system carrier (6) held on the base frame (5), wherein the adjustment of the travel path (41) is carried out by adjusting the drafting system carrier (6) relative to the base frame (5), or that the drafting system (1) is fastened to the base frame (5), wherein the deflection roller (22) of the output roller pair (18) is held via a bearing arm (43), and wherein to adjust the travel path (41) the bearing arm (43) is rotated about the axis of rotation (44) of the lower roller (20) of the output roller pair (18), or that the drafting system (1) is fastened to a drafting system carrier (6) held on the base frame (5) with a pivot axis (46), wherein to adjust the travel path (41) the drafting system carrier (1) is rotated about the pivot axis (46) is pivoted.
  14. 14. Method according to claim 12 or 13, characterized in that the textile machine has a control (38) and when the production speed of the textile machine changes, the travel path (41) is automatically adjusted by the control (38).
  15. 15. Method according to one or more of claims 12 to 14, characterized in that the travel path (41) is measured with a sensor (12), compared with a specification in the control (38) and adjusted according to the specification and that in the case of a If there is a remaining deviation between the specified value and the measured path (41), an alarm is issued.

Description

DEVICE FOR A TEXTILE MACHINE WITH A DRAWING SYSTEM AND METHOD FOR OPERATING A TEXTILE MACHINE WITH THE DRAWING SYSTEM The present invention relates to a device for a textile machine with a drafting system for drawing at least one fiber sliver and with a fleece nozzle arranged at the outlet of the drafting system for gathering the drawn fiber sliver, as well as a textile machine and a method for operating a textile machine. Such drafting systems are used in a wide variety of textile machines. For example, they are used in combing machines to draw the combed fiber slivers from the individual combing points together and thereby form a single fiber sliver. Drafting systems are also used in drawing machines for doubling and mixing a large number of fiber slivers. Another example of the use of drafting systems is cards, in which drafting systems are used to even out the fiber slivers formed in the cards. The drafting system has, for example, a drafting zone in which the fiber sliver is drawn or stretched. The drafting zone also has, for example, at least two pairs of rollers. The fiber sliver is guided between the rollers of the pairs of rollers. By means of a different rotation speed of the two pairs of rollers, the fiber sliver is drawn onto a spread-out fiber sliver arranged at an exit of the drafting system. Furthermore, several individual fiber slivers can be combined and drawn with the help of the drafting system, so that the homogeneity of the fiber sliver is increased. The sliver leaves the drafting system as a spread-out sliver, i.e. it has a small thickness compared to its width. At the exit of the drafting system, a fleece nozzle is arranged to gather the fiber sliver. The fleece nozzle is arranged after the drafting system in order to gather the spread fiber sliver so that a strand-shaped fiber band leaves the fleece nozzle. The fleece nozzle has an inlet side at which the spread fiber band enters the fleece nozzle. The fleece nozzle also has an outlet side at which the combined fiber band leaves the fleece nozzle. When the fiber band leaves the fleece nozzle, it has an essentially circular cross-section. This means that the fiber band can be deposited in a can, for example. In order to achieve a trouble-free gathering of the spread fiber sliver in the fleece nozzle, it is very important that the spread fiber sliver hits the input side of the fleece nozzle. The position of the drafting system in relation to the fleece nozzle is crucial here, apart from the design of the fleece nozzle itself. The position of the drafting system determines a path between a last clamping point of the last roller pair of the drafting system and the fleece nozzle. A clamping point is a point between two opposite rollers of a roller pair at which the rollers are closest to each other and the fiber sliver is clamped. The ideal position of the drafting system in relation to the fleece nozzle depends, among other things, on the delivery speed of the drafting system and the materials of the fiber sliver(s) that pass through the drafting system. A fiber impact zone in the fleece nozzle is crucial for the best uniformity values in the fiber sliver and for optimal running behavior. The fibers of the spread fiber band ideally hit the fleece nozzle in such a way that a controlled folding of the lateral partial fleeces towards the center takes place without preventing middle fleece streams from flowing through the fleece nozzle. Improvements could be achieved by geometric adjustments in the drafting system, as disclosed for example in DE 10 2015 101 704 A1 or DE 10 2015 106 808 A1. However, the distance between the drafting system and the fleece nozzle represents a compromise, which can be achieved by various structural designs or arrangement of guide elements in the Nonwoven nozzle should be improved. However, if the fibers land too close to a nozzle front wall or directly on a wall, then a controlled fiber flow is disrupted and jams occur in the nonwoven nozzle and a production process is interrupted. If the fibers land too far in front of the front wall, folding is also disrupted. The uniformity values in the fiber sliver become significantly worse or the sliver breaks. DE 10 2018 118 923 A1 discloses a drafting system in which an attempt is made to select the nonwoven nozzle from a large number of different nonwoven nozzles depending on at least one sliver property of the spread out fiber sliver. There are therefore several different nonwoven nozzles to choose from, from which the most suitable is selected so that the quality of the fiber sliver emerging from the nonwoven nozzle is the best or most advantageous. Different geometries, shapes, designs and/or materials of the nonwoven nozzle can lead to different qualities of the fiber sliver emerging from the nonwoven nozzle, whereby it is advantageous if the nonwoven nozzle is selected that leads to the best quality of the fiber sliver emerging from the nonwoven nozzle. Tuning t