EP3724382A1 - Drawing frame for a spinning machine having a compacting device - Google Patents
Drawing frame for a spinning machine having a compacting deviceInfo
- Publication number
- EP3724382A1 EP3724382A1 EP18815976.8A EP18815976A EP3724382A1 EP 3724382 A1 EP3724382 A1 EP 3724382A1 EP 18815976 A EP18815976 A EP 18815976A EP 3724382 A1 EP3724382 A1 EP 3724382A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nip
- drafting system
- fiber
- point
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000009987 spinning Methods 0.000 title claims abstract description 33
- 239000000835 fiber Substances 0.000 claims abstract description 162
- 238000000034 method Methods 0.000 claims abstract description 7
- 230000006835 compression Effects 0.000 claims description 19
- 238000007906 compression Methods 0.000 claims description 19
- 238000000926 separation method Methods 0.000 claims description 14
- 239000002131 composite material Substances 0.000 claims description 10
- 238000005056 compaction Methods 0.000 claims description 7
- 238000012216 screening Methods 0.000 claims description 4
- 229920006240 drawn fiber Polymers 0.000 description 6
- 241000124008 Mammalia Species 0.000 description 5
- 239000003570 air Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 206010020112 Hirsutism Diseases 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007378 ring spinning Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
- D01H1/02—Spinning or twisting machines in which the product is wound-up continuously ring type
- D01H1/025—Spinning or twisting machines in which the product is wound-up continuously ring type with a condensing device between drafting system and spinning unit
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
- D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
- D01H5/70—Constructional features of drafting elements
- D01H5/72—Fibre-condensing guides
Definitions
- the present invention relates to a drafting system with a device for compacting drawn slivers in a spinning machine.
- Draw frames for spinning machines comprise at least two pairs of rollers between which a fiber strand is drawn due to the different speeds of rotation of the roller pairs.
- the pair of rollers after which the stretched fiber structure leaves the drafting system and is fed to a spinning device is referred to as a pair of delivery rollers.
- the output roller pair consists of an output top roller and an output bottom roller, which form a nip through which the fiber band is conveyed.
- Devices for compressing the drawn fiber composite are arranged after the pair of delivery rollers, mechanical as well as pneumatic compaction devices being used.
- the compacting device disclosed therein is of pneumatic construction and consists essentially of a suction shoe and a perforated transport. In this case, a pressure element is applied to one of the rollers of the pair of output rollers, which forms a second nip with the roller next to the nip between the output top roller and the bottom roller output.
- DE 100 50 089 A1 does not deal with an embodiment of the clamping points, nor are the conveying speeds for the fiber structure before and after the compression described further.
- a disadvantage of the proposed device is that due to the random conditions occurring in the fiber transport through the Faserbünde- zone results in an irregular compression of the fiber structure.
- a drafting system for a spinning machine is proposed, with an output roller pair formed by an output top roller and an output bottom roller. Furthermore, a fiber densification downstream of the output roller pair of the drafting system is provided for compressing a stretched fiber structure, wherein the fiber compaction zone comprises a pneumatic compacting device with a fiber bundling zone and with a suction pipe looped and sucked by a sieve element.
- the fiber-bundling zone is delimited by two clamping points with a respective length, wherein a first nip is defined by the rollers of the pair of delivery rollers and a second nip
- Clamping point is defined by the output roller and the screen element. Seen in the longitudinal direction of the fiber structure, the length of the first
- the length of a nip in the longitudinal direction of the fiber structure passing through the nip is influenced by the nature of the elements forming the nip, respectively rollers, and the compressive force with which the two elements are pressed against each other.
- the clamping point becomes longer the more elastic the elements are formed and when increasing the pressure force.
- a longer nip results in a stronger clamping of the individual fibers of the fiber structure and thus an increase in the slippage of promoting the fiber structure.
- the first clamping point which is formed by the pair of delivery rollers, must, as far as possible, achieve a slip-free transport of the fiber structure due to the stretching of the fiber structure to be achieved, and therefore has a high length.
- a suction pipe is arranged. Which is at least partially wrapped by a screen element. Between the first and the second clamping point, enclosed by the sieve element and the elements forming the first clamping point, there is a fiber-bundling zone. In this fiber-bundling zone, the stretched fiber structure leaving the first clamping point is compacted. The emerging from the pair of output roller fiber strand meets shortly before reaching the second nip on the screen element and is guided on this to the second nip. The fiber structure is bundled by the influence of an air flow.
- the second clamping point In order not to press the fiber structure apart again in the second clamping point on the one hand, and to leave a certain freedom of movement to the individual fibers for bundling on the other hand, it is advantageous to make the second clamping point shorter than the first clamping point.
- the fiber structure moves on a sieve element transversely to its running direction and thereby the fibers are pushed together
- fiber bundling only fiber parts or fiber ends protruding from the fiber structure are brought to the fiber structure without the fiber structure emerging his direction is deflected.
- the fiber ends are guided by a pneumatic suction flow to the fiber structure and applied in the second nip to the fiber structure.
- the screening element is driven and ensured by the second clamping point that the rotation of the fiber structure resulting from the subsequent spinning device does not extend beyond the second clamping point into the Fiber bundle zone propagates. Due to the friction drive of the screen element, a slight slip occurs, so that the screen element has a lower speed than the pair of output rollers. This circumstance also contributes to bundling the fiber structure.
- the sieve element circulates around the suction tube, which has a mammal opening in the area between the first and the second clamping point.
- the ambient air sucked in through the mammalian opening causes individual fibers projecting from the fiber structure to be moved towards the mammal opening, thereby bundling the fiber structure.
- the suction tube and thus the sieve are advantageously brought as close to the first nip.
- the suction tube may be formed as a proper tube or as an elongated FlohlSystem with a triangular, polygonal, elliptical or other cross-sectional shape.
- a detachment point is provided, at which the drawn and compressed fiber structure separates from the sieve element.
- a deflection point for the stretched and compacted fiber structure is arranged, over which the fiber structure is deflected and guided to the subsequent spinning device.
- an angle between a tangent to the initial upper roll at the second nip and the course of the fiber structure between the release point and the deflection point less than 90 °, preferably less than 70 ° preferred.
- the fiber structure is guided on the sieve element through the second nip. After leaving the second clamping point, the fiber composite is guided over a deflection point before the fiber structure passes from the deflection point to the spinning device.
- the deflection point can be used as a thread guide rer or be provided as a simple deflection bar. Since it is not conducive to the quality of the fiber structure if it is subjected to excessive deflections, it is advantageous to arrange the separation point on the sieve element in such a way that the most gentle course of the fiber structure is made possible.
- the position of the deflection point is given by the geometric arrangement of the spinning machine and its drafting system.
- the separation point can be influenced by the geometry of the suction tube around which the sieve rotates.
- a pressing force of the second clamping point is less than a pressing force of the first clamping point.
- a pressing force of the sieving element on the output upper roller of the second clamping point is less than a pressing force of the rolls of the pair of output rollers forming the first clamping point relative to one another.
- the different length of the clamping points can, in addition to a different pressing force, also be influenced by a different choice of material with regard to the elasticity of the two elements located opposite one another at the respective clamping point.
- the pressing force of the first nip 75 N to 125 N and the pressing force of the second nip 8 N to 20 N Due to the low pressure force in the second nip a gentle further transport of the compacted fiber structure is achieved. Due to the low pressure force, it is also achieved that there is only a slight difference in speed between the starting upper roller and the wire screen, which has a favorable effect on fiber bundling. However, the pressing force is ever large enough to prevent that a swirl issued to the fiber structure after the compression zone is transferred into the compression zone.
- a clamping length is formed between the first nip and the second nip, which is smaller than a middle Fiber stack length of the fiber structure to be compacted.
- the constant clamping of at least one fiber end prevents the fiber structure from losing or partially losing the stretch applied in the drafting device during the passage through the fiber-bundling zone.
- the clamping length is 12 mm to 20 mm.
- the protruding fiber parts are bundled into a fiber structure in such a way that they are securely bound during the subsequent spinning process.
- further fiber parts are used for substance utilization in the yarn in comparison with an uncompressed fiber structure.
- the short clamping length has the advantage that only the free fiber ends are moved and thus the fiber bundling forces only the stiffness of the individual fibers have to overcome.
- the suction tube after the second nip in the region of the separation point has a radius of less than 10 mm. This results in a sharp definition of the separation point. This has the consequence that a uniform detachment of the entire fiber structure is achieved. follows and thus a long-term maintenance of the previously performed fiber bundling can be achieved.
- the separation point is less than 10 mm on the surface of the screen element from the second nip and / or in the radial direction of the output top roller of the second nip less than 4 mm from a surface of the top roller.
- the suction tube in the radial direction of the output sub-roller is less than 2 mm away from a surface of the output sub-roller.
- the compacting device is arranged on a machine frame of the spinning machine or on the drafting system.
- the fastening is preferably arranged on a pressure arm of the drafting system.
- the pressure arm which usually also carries the upper rollers of the drafting roller pairs, not only the entire drafting system is opened, but also the compression device is raised.
- the adjuster can mittein with mechanical adjustment, as in example screws, or springs are equipped. The use of springs causes the adjuster to resiliently press the screen member and / or the suction tube against the roller of the second nip.
- a method for compacting a fiber composite in a spinning machine with a drafting system with a pair of output rollers, which is formed by an output top roller and an output bottom roller.
- the fiber structure is conveyed through the pair of delivery rollers to a downstream fiber compaction, which has a pneumatic compression device with a fiber bundling zone and with a suction pipe looped and sucked by a sieve element.
- the fiber bundling zone is delimited by two nips each having a respective length, wherein the starting upper roll and the lower discharge roll define a first nip and the output upper roll and the screen define a second nip.
- the fibers of the fiber structure are guided through the first nip to the screen element and taken over by the second nip of the screen element.
- the leadership of the fibers is determined by a greater length of the first terminal point with respect to the length of the second nip.
- Figure 1 is a schematic representation of a longitudinal section of a
- Figure 2 is a schematic representation of a longitudinal section of an inventive embodiment of the compression device of the drafting and
- FIG. 3 shows a schematic representation of a longitudinal section of another embodiment of the compression device of the drafting system according to the invention.
- Figure 1 shows a schematic representation of a longitudinal section of a spinning machine according to the prior art, in particular a ring spinning machine.
- individual components of the spinning machine are shown, namely a drafting device 2 and a spinning device 10.
- the drafting device 2 consists of three pairs of rollers, an input roller pair 3, a pair of apron rollers 4 and an output roller pair 5.
- the output roller pair 5 is formed by a pair of rollers Output top roller 6 and an output bottom roller 7.
- the two rollers of a pair of rollers are pressed against each other and form a nip at its point of contact, wherein the nip K1 is formed by the pair of output rollers 5 between the output top roller 6 and the output bottom roller 7.
- the entering into the drafting 2 fiber structure 1 is clamped between the rollers of the roller pairs 3,4 and 5 through the clamping points and conditionally stretched by the different speeds of the roller pairs 3, 4 and 5.
- the stretched fiber structure 1 is transported simultaneously through the drafting system 2.
- the drawn fiber structure 8 After leaving the drafting system 2, the drawn fiber structure 8 reaches a yarn guide 9 and is passed on to the spinning device 10.
- the spinning device 10 consists essentially of from a ring rail 14, which carries the spinning ring 12, and a spindle bank 15, on which the coil 13 is fastened.
- the fiber structure 8 reaches the bobbin 13 via a rotor 11.
- the bobbin 13 is rotated to spin the fiber composite 8, this has the consequence that the rotor 11 is also rotated by the fiber structure 8 on the ring 12 becomes. Due to the different rotational speed of the bobbin 13 and rotor 11, the fiber structure 8 is given a rotation, thereby forming a yarn which is wound on the bobbin 13 by moving the ring rail 14 up and down.
- FIG. 2 shows a schematic representation of a longitudinal section of an embodiment according to the invention of a compression device of the drafting system.
- the pair of output rollers 5, formed by the output roller 7 and the top roller 6 forms a nip K1 through which the fiber structure 1 is guided. Due to the pressing force F1 of the rollers 7 and 6 of the pair of output rollers 5, the surfaces of the rollers 6 and 7 or at least one of the surfaces of the rollers 6 or 7 are deformed, whereby the clamping point K1 extends over a length L1.
- the length L1 of the terminal point K1 extends in the direction of the fiber structure 1 and corresponds to the distance on which the fiber structure 1 is clamped by the pair of output rollers 5. After leaving the exit roller pair 5, the fiber structure is stretched and continues as a drawn fiber structure.
- a suction pipe 17 is arranged.
- the suction tube 17 is wrapped by a sieve 18, which is designed as an endless belt and is guided over a deflection 24.
- the sieve element 18 forms a second nip K2 for the drawn fiber structure with the exit upper roller 6.
- the suction tube 17 with the sieve element 18 guided thereon is pressed against the output top roller 6 with the pressing force F2, as a result of which the Surface of the top roller 6 slightly deformed. This results in the length L2 of the second nip K2.
- the shape of the suction tube 17 is shown as a polygon, but there are also any other shapes such as triangle, ellipses, etc. possible.
- the drawn fiber structure runs through a fiber bundling zone 16 between the first nip K1 and the second nip K2.
- the fiber bundling zone 16 designates the space which is enclosed by the starting upper roll 6, the output lower roll 7 and the suction pipe 17.
- the suction tube 17 has a suction opening 23 in this fiber-bundling zone 16.
- the mammal opening 23 is preferably formed as a slot-shaped opening in the wall of the suction tube 17.
- the suction pipe 17 is connected to a vacuum source (not shown), this causing air to be sucked out of the fiber bundling zone 16 via the suction opening 17 and thus also through the sieve element 17 sliding over the suction opening 17.
- the drawn fiber dressing is used on the sieve element 18, with individual fibers projecting from the stretched fiber structure being conveyed to the mammal opening 23 and thus nestled against the stretched fiber structure.
- the sieve element 18 is set in motion by the output top roller 6 via the frictional force generated in the clamping point K2, whereby the stretched fiber structure from the fiber bundling zone 16 of the second
- Terminal point K2 is supplied.
- the compacted fiber structure 19 then leaves the screening element 18 at a separation point 21, which does not necessarily have to correspond to the end of the clamping point K2.
- the compacted fiber structure 19 is then fed via a deflection point 20 of the spinning device or the yarn guide arranged in front of the spinning device.
- the geometry of the suction tube 17 and the arrangement of the deflection point 20 make it possible to restore the necessary inlet geometry for proper functioning of the spinning device despite the additional arrangement of the compacting device.
- the thread guide 9 associated with the spinning device can also be used as a deflection point, whereby the additional deflection point 20 is dispensed with.
- an angle a under which the compressed fiber structure 19 leaves the screening element 18 at the detachment point 21 is smaller than 70 °.
- the angle a is 50 °.
- the angle ⁇ corresponds to the included angle between the running direction of the compressed fiber structure 19 after the detachment point 21 and a tangent 22 applied to the surface of the output upper roller 6 in the second clamping point K2.
- FIG. 3 shows a schematic illustration of a longitudinal section of another embodiment of the compression device of the drafting system according to the invention.
- the output roller pair 5, formed by the output lower roller 7 and the output upper roller 6 forms a nip K1 through which the fiber strand 1 is guided.
- a sieve element 18 After leaving the first nip K1 of the stretched fiber structure strikes a sieve element 18 which rotates about a suction pipe 17 and a deflector 24.
- the suction tube 17 is arranged to ensure a trouble-free transition of the Faserverban- from the first nip K1 to the screen element 18 with a distance C of less than 2 mm to the surface of the output sub-roller 7 net.
- the distance C is measured in the radial direction of the output sub-roller 7 from the surface of the output sub-roller 7.
- the sieve element 18 brings the stretched fiber structure to the second clamping point K2, which are formed by the output top roller 6 and the sieve element 18.
- the sieve element 18 is set in motion by the output top roller 6 via the frictional force generated in the clamping point K2, whereby the stretched fiber structure from the fiber bundling zone 16 of the second
- Terminal point K2 is supplied.
- the compressed fiber structure 19 then leaves the sieve element 18 at a separation point 21.
- the suction tube 17 is designed so that the separation point 21 is arranged in the radial direction of the réelleoberwalze 6 in the second nip K2 from a surface of the réelleoberwalze 6 with a distance B of less than 4 mm.
- a length A which the compressed fiber structure 19 travels from the second clamping point K2 to the detachment point 21 on the sieve element 18 is less than 10 mm.
- the suction pipe is designed in the region of the separation point with a radius R of less than 10 mm.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Or Twisting Of Yarns (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH01527/17A CH714444A1 (en) | 2017-12-15 | 2017-12-15 | Drafting system for a spinning machine with a compacting device. |
PCT/EP2018/083319 WO2019115267A1 (en) | 2017-12-15 | 2018-12-03 | Drawing frame for a spinning machine having a compacting device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3724382A1 true EP3724382A1 (en) | 2020-10-21 |
EP3724382B1 EP3724382B1 (en) | 2023-01-25 |
Family
ID=64664247
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18815976.8A Active EP3724382B1 (en) | 2017-12-15 | 2018-12-03 | Drafting unit for a spinning machine having a compacting device |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3724382B1 (en) |
CN (2) | CN111448344A (en) |
CH (1) | CH714444A1 (en) |
WO (1) | WO2019115267A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH714444A1 (en) * | 2017-12-15 | 2019-06-28 | Rieter Ag Maschf | Drafting system for a spinning machine with a compacting device. |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10050089C2 (en) | 2000-03-08 | 2002-06-27 | Zinser Textilmaschinen Gmbh | Drafting system for a spinning machine |
US4976096A (en) * | 1989-06-15 | 1990-12-11 | The United States Of America As Represented By The Secretary Of Agriculture | System for producing core/wrap yarn |
DE19838762B4 (en) * | 1998-08-26 | 2009-04-16 | Maschinenfabrik Rieter Ag | Spinning machine with a variety of spinning stations |
DE19922861A1 (en) * | 1999-05-19 | 2000-11-23 | Stahlecker Fritz | System to condense a drawn sliver maintains a clamping action on a significant portion of the sliver fibers at the end of the drawing unit during the condensing action to prevent clogging the transport belt |
EP1134309B1 (en) * | 2000-03-08 | 2003-12-17 | Zinser Textilmaschinen GmbH | Drawing frame with following condensing zone for a spinning machine |
DE10019436A1 (en) * | 2000-04-19 | 2001-10-25 | Zinser Textilmaschinen Gmbh | Sliver drawing unit has a condensing action between two defined sliver clamping points with a lateral reciprocating movement across the sliver travel line to reduce wear for a consistent spun yarn quality |
DE10053698A1 (en) * | 2000-10-23 | 2002-05-02 | Stahlecker Fritz | Device on a spinning machine for compacting a fiber structure |
DE10343316A1 (en) * | 2003-09-10 | 2005-04-14 | Wilhelm Stahlecker Gmbh | Fiber strand focussing apparatus of spinning machine, has tension roller that arranged at down stream side of deflection roller, enables deflection roller to deflect transport belt at specific angle |
DE102007006282A1 (en) * | 2007-02-01 | 2008-08-07 | Wilhelm Stahlecker Gmbh | Drawframe with compression zone |
CH714444A1 (en) * | 2017-12-15 | 2019-06-28 | Rieter Ag Maschf | Drafting system for a spinning machine with a compacting device. |
-
2017
- 2017-12-15 CH CH01527/17A patent/CH714444A1/en not_active Application Discontinuation
-
2018
- 2018-12-03 EP EP18815976.8A patent/EP3724382B1/en active Active
- 2018-12-03 CN CN201880080017.9A patent/CN111448344A/en active Pending
- 2018-12-03 WO PCT/EP2018/083319 patent/WO2019115267A1/en unknown
- 2018-12-12 CN CN201822089459.XU patent/CN209652486U/en active Active
Also Published As
Publication number | Publication date |
---|---|
WO2019115267A1 (en) | 2019-06-20 |
EP3724382B1 (en) | 2023-01-25 |
CN111448344A (en) | 2020-07-24 |
CH714444A1 (en) | 2019-06-28 |
CN209652486U (en) | 2019-11-19 |
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