EP1432854A1 - Dispositif de detection et d'elimination de corps etrangers sur un nontisse forme a l'aide d'une carde - Google Patents

Dispositif de detection et d'elimination de corps etrangers sur un nontisse forme a l'aide d'une carde

Info

Publication number
EP1432854A1
EP1432854A1 EP02774665A EP02774665A EP1432854A1 EP 1432854 A1 EP1432854 A1 EP 1432854A1 EP 02774665 A EP02774665 A EP 02774665A EP 02774665 A EP02774665 A EP 02774665A EP 1432854 A1 EP1432854 A1 EP 1432854A1
Authority
EP
European Patent Office
Prior art keywords
nonwoven fabric
cross
section
separating
foreign matter
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
Application number
EP02774665A
Other languages
German (de)
English (en)
Other versions
EP1432854B1 (fr
Inventor
Andreas Meyenhofer
Walter Kiechl
Christoph Schönbächler
Thomas Brose
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jossi Holding AG
Original Assignee
Maschinenfabrik Rieter AG
Jossi Holding AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Maschinenfabrik Rieter AG, Jossi Holding AG filed Critical Maschinenfabrik Rieter AG
Priority to EP02774665A priority Critical patent/EP1432854B1/fr
Publication of EP1432854A1 publication Critical patent/EP1432854A1/fr
Application granted granted Critical
Publication of EP1432854B1 publication Critical patent/EP1432854B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G31/00—Warning or safety devices, e.g. automatic fault detectors, stop motions
    • D01G31/003—Detection and removal of impurities

Definitions

  • the invention relates to a device for recognizing and eliminating foreign matter on a nonwoven fabric formed by a card according to the preamble of claim 1.
  • the separation of foreign matter from the nonwoven fabric on the card is intended to prevent it from remaining in the card sliver, where it will later only be are difficult to remove and lead to loss of quality and production interruptions in the spinning mill.
  • the foreign matter on the card's fiber fleece is easy to control from the direction of movement and is embedded in a relatively thin fiber layer.
  • EP-B 606 626 has already disclosed a device of comparable type in which disruptive particles such as e.g. Nits, shell parts, etc. on the pick-up device are torn out by an air flow directed transversely to the nonwoven fabric.
  • disruptive particles such as e.g. Nits, shell parts, etc.
  • a series of air nozzles is arranged over the entire width, which can be acted upon with compressed air via individual valves.
  • a disadvantage of the known devices is that the tearing out of the foreign matter from the nonwoven is associated with a considerable design effort and that the nonwoven is negatively influenced with regard to uniformity, evenness, etc. Also the anisotropic behavior of the nonwoven Because of the partial rectification of the fibers in the transport direction, problems arise because the fleece tears faster on a line parallel to the transport direction than transversely to the transport direction. It is therefore an object of the invention to provide a device of the type mentioned in the introduction, in which an efficient control of the air flow can be achieved with simpler means, the narrow spatial conditions at the card also being taken into account in particular.
  • the object can be achieved with a device which contains the features in claim 1.
  • An essential element here is the guide wall, in which at least one row of suction openings defining a plurality of separation cross sections is arranged over the entire width.
  • Each suction opening is adjacent to a flow channel with a venturi nozzle for generating a suction effect.
  • the suction effect can be generated with a blast of compressed air, this blast of compressed air simultaneously serving to further transport the foreign matter.
  • the separation cross sections could be defined using the flow orifices described below. In certain cases, however, it would also be conceivable to omit the flow orifices completely, so that the openings on the guide wall are permanently exposed.
  • At least one baffle can be arranged in the flow channel after the Venturi nozzle and after the suction opening.
  • the guide wall can limit the nonwoven fabric at a suitable location on the pickup roller or on the pickup device.
  • the guide wall is particularly advantageously formed by a fleece bridge on the customer device.
  • the guide wall can, however, also be formed by a section above the take-up roll which is curved concentrically to the take-off roll.
  • several rows of suction openings can be arranged one behind the other, the suction openings of the individual rows being offset with respect to the width of the guide wall.
  • the suction openings of the individual rows can overlap slightly in the feed direction.
  • the object is also achieved with a device which has the features in claim 6.
  • the at least two flow orifices which can be displaced relative to one another and each have an opening make it possible to expose a cross-section of the separation directly on the nonwoven fabric.
  • alternating cross-sections can be exposed over the entire width of the nonwoven fabric.
  • the two openings form a first cross-section in at least a first relative position, wherein a second cross-section can be exposed in at least one second position, which cross-section is arranged offset to the feed direction to the first cross-section.
  • the guide wall which contains one of the two flow orifices, supports and guides the nonwoven fabric, making it much easier to pull out the foreign matter.
  • the openings can be intersecting slots, the relative displacement of which leads to a displacement of the cutting cross-section transversely to the feed direction.
  • the separation cross-section is formed by the intersection area.
  • it can also be individual openings that are covered or exposed depending on the relative position.
  • the flow orifices can be arranged above the take-off roll and, if necessary, can be adapted to the roll curvature. However, it is also conceivable to arrange the flow orifices on the customer device, in particular on a fleece bridge. At least one of the flow orifices can be displaced in the feed direction and / or transversely to the feed direction. However, it is also conceivable to mount both flow orifices movably and, if necessary, to move them simultaneously.
  • each separation cross-section is connected to a common flow channel over the entire width of the nonwoven fabric.
  • Several flow channels have to be routed, but they serve several separation cross sections within a group.
  • the sensor device can act directly on the surface of the nonwoven fabric. These can be sensors that react to different physical parameters. However, these will preferably be light-sensitive sensors which react to certain wavelengths of light. In order to open up difficult-to-access locations for the detection, it is particularly advantageous if the signal transmission from a detection field extending across the width of the fiber fleece to the actual sensor takes place via several optical waveguides. This enables the use of a non-imaging sensor system that does not require complex lens systems. The ends of the optical fibers can be brought very close to the nonwoven fabric and they are relatively insensitive to contamination.
  • the fleece can be illuminated in incident light or in transmitted light. It is conceivable that the fleece or the detection field is also illuminated via optical fibers.
  • the detection field could easily be arranged in the area of the take-off roller.
  • FIG. 1 a schematic side view of a card
  • FIG. 2 the take-off roller of a card with sensor device and separating device with flow orifices
  • FIG. 3 a top view of a first exemplary embodiment of flow orifices
  • FIG. 4 a top view of a second exemplary embodiment of flow orifices
  • FIG. 5 shows a perspective illustration of a third exemplary embodiment of flow orifices
  • FIG. 6 a schematic side view of a doffer with a fleece bridge
  • FIG. 7 a top view of the fleece bridge according to FIG. 6,
  • FIG. 8 a perspective representation of a sensor device with optical waveguides on a freely stretched nonwoven fabric
  • Figure 9 is a perspective view of a sensor device with optical fibers on a doffer.
  • Figure 10 the take-off roller of a card with sensor device and separation device with Venturi nozzles and
  • Figure 11 a plan view of a guide wall with staggered suction openings.
  • FIG. 1 shows part of a card 1 in which cotton fibers are fed to a feed device 12 in the feed direction a) in a manner known per se. From there, the fibers reach the drum 13, where they are straightened on fixed carding elements and on the traveling lids 14.
  • the fiber fleece 2 is removed from the doffing roller 3, which runs slower than the drum, and detached from the doffing roller at the doffing device 4.
  • a doctor roll 15 is provided in the exemplary embodiment, which guides the nonwoven fabric onto a nonwoven bridge 17.
  • a pair of pull rollers 16 is provided for removal.
  • the separating device 6 can optionally be arranged in the peripheral area of the take-off roller 3 or in the area of the take-off device 4.
  • a multiple arrangement of sensor device and separation device on different sections of the feed path would also be conceivable.
  • the separating device 6 consists of two flow orifices 8 and 9 which can be displaced relative to one another.
  • the orifices are curved concentrically to the take-off roller 3 and they each have an opening which exposes a separating cross section 7 in a relative position.
  • the first diaphragm 8 is fixedly arranged, while the second diaphragm 9 lying on it can be displaced in the circumferential direction b).
  • the first screen 8 also forms a guide wall for the nonwoven fabric, or is a component of such.
  • two rows of three first openings 10a, 10b, 10c and 10d, 10e, 10f are arranged offset from one another in the first flow orifice 8 at an angle of approximately 45 ° to the feed direction.
  • two parallel rows of second openings 11a, 11b, 11c and lld, lle, llf are likewise arranged at an angle of approximately 90 ° to the feed direction. In the position shown relative to each other, all openings 10a to 10f are covered, so that no cut-out cross section is exposed.
  • the opening 11a corresponds to the opening 10a below it, the corresponding separating cross section being exposed. However, all other openings in the first flow orifice 8 remain covered.
  • the opening 11b corresponds to the opening 11b with the opening 10b underneath, while likewise all other openings remain covered.
  • the openings 10d, 10e or 10f can be exposed in the same way.
  • the flow orifices are shifted relative to one another for the selective exposure of the desired cross-section of the separation via a drive device, not shown here, e.g. via an electric motor.
  • This drive device is controlled via a control device as a function of the position and the feed rate of the foreign substance determined by the sensor device.
  • the shift does not necessarily have to be in the feed direction. Movements transverse to the feed direction are also conceivable.
  • the openings have the shape of intersecting slits, a diamond-like separation cross section 7 being exposed in the intersection area. If the second flow orifice 9 is displaced in the direction of arrow c up to the new position 11 ⁇ shown in dash-dotted lines, the separating cross section 7 obviously also shifts along the axis of the first opening 10 by the lateral distance g. In this way, a practically stepless displacement of the separating cross section 7 is possible.
  • the exemplary embodiment according to FIG. 5 differs from that according to FIG. 4 in that the slot-shaped opening 10 in the first flow orifice 8 is parallel to the central axis the take-off roller 3 extends.
  • the slot-shaped opening 11 in the second flow orifice 9, on the other hand, runs at a certain angle to the central axis or to the opening 10. In this arrangement, a displacement of the two flow orifices relative to one another also causes a displacement of the separating cross section 7 parallel to the central axis of the take-off roller 3.
  • the nonwoven fabric 2 is removed by a doctor roller 15 from the take-off roller 3 and transferred to a nonwoven bridge which is formed by a guide wall 19.
  • a plurality of suction openings 20 are arranged in the guide wall, each of which opens into an underlying flow channel 18. A blast of compressed air can be conducted through this flow channel in the direction of flow h.
  • a Venturi tube or a Venturi nozzle 21 is arranged directly in front of each opening 20. Obviously, this causes an increase in the flow velocity and a pressure drop at the narrowest cross section, which can be determined using the Bernoulli equation.
  • the detected point of the carding fleece is sucked into the flow channel 18 and fed to a collecting container 27.
  • Baffles 22 prevent the foreign substances from being returned.
  • the compressed air blasts are controlled by a sensor device, not shown here, which can be arranged in the area of the take-off roller or in the area of the fleece bridge.
  • FIGS. 8 and 9 show possibilities for optical detection on the nonwoven fabric 2 in the stretched state or also on the take-off roller 3 with the aid of optical waveguides 25.
  • the individual conductors are brought very close to the surface of the nonwoven fabric to be detected. This makes it possible to move the sensor 23 or the individual sensors relatively far away from the detection 24 to arrange.
  • the lighting can also take place via the individual optical fibers or via optical fibers guided in parallel. Illumination of the detection field is also possible in transmitted light, as shown in FIG. 8.
  • the use of optical fibers in devices of comparable generic type has already become known through Uhlmann Jürg, "Detection of Foreign Substances in Raw Cotton", Diss. ETH Zurich, 1996.
  • FIG. 10 shows an embodiment of an invention with a function similar to that according to FIG. 6.
  • the guide wall 19 is designed here as a section which is curved concentrically to the center of the take-off roller 3.
  • the guide wall could also extend over a larger sector of the take-off roller and the suction openings 20 could also be arranged elsewhere, e.g. near the fleece bridge 17.
  • the venturi nozzles 21 are arranged in the flow channel 18 directly in front of the suction openings 20, the baffles 22 preventing the foreign substances from being returned.
  • a plurality of rows of suction openings 20a, 20b and 20c could be arranged one after the other, the suction openings of the individual rows being offset relative to the width of the guide wall 19.
  • a group of suction openings it would be entirely possible for a group of suction openings to be arranged in the area of influence of a common Venturi nozzle, that is to say that a single flow channel 18 serves a group of suction openings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Abstract

L'invention concerne un dispositif d'élimination (6), commandé par un dispositif de détection (5) et installé dans la zone du peigneur (3) ou bien du dispositif (4) peigneur d'une carde. Ce dispositif d'élimination présente au moins une paroi de guidage (19) pour le nontissé (2), dans laquelle au moins une série d'orifices d'aspiration (20) est formée sur toute la largeur de ladite paroi. Chaque orifice d'aspiration est contigu à un canal d'écoulement pourvu d'une tuyère Venturi destinée à produire un effet d'aspiration.
EP02774665A 2001-10-05 2002-09-28 Dispositif de detection et d'elimination de corps etrangers sur un nontisse forme a l'aide d'une carde Expired - Lifetime EP1432854B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02774665A EP1432854B1 (fr) 2001-10-05 2002-09-28 Dispositif de detection et d'elimination de corps etrangers sur un nontisse forme a l'aide d'une carde

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP01810972 2001-10-05
EP01810972A EP1300493A1 (fr) 2001-10-05 2001-10-05 Appareil pour détecter et éliminer des corps étrangers dans une nappe de fibres cardée
EP02774665A EP1432854B1 (fr) 2001-10-05 2002-09-28 Dispositif de detection et d'elimination de corps etrangers sur un nontisse forme a l'aide d'une carde
PCT/EP2002/010924 WO2003031697A1 (fr) 2001-10-05 2002-09-28 Dispositif de detection et d'elimination de corps etrangers sur un nontisse forme a l'aide d'une carde

Publications (2)

Publication Number Publication Date
EP1432854A1 true EP1432854A1 (fr) 2004-06-30
EP1432854B1 EP1432854B1 (fr) 2006-02-01

Family

ID=8184178

Family Applications (2)

Application Number Title Priority Date Filing Date
EP01810972A Withdrawn EP1300493A1 (fr) 2001-10-05 2001-10-05 Appareil pour détecter et éliminer des corps étrangers dans une nappe de fibres cardée
EP02774665A Expired - Lifetime EP1432854B1 (fr) 2001-10-05 2002-09-28 Dispositif de detection et d'elimination de corps etrangers sur un nontisse forme a l'aide d'une carde

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP01810972A Withdrawn EP1300493A1 (fr) 2001-10-05 2001-10-05 Appareil pour détecter et éliminer des corps étrangers dans une nappe de fibres cardée

Country Status (3)

Country Link
EP (2) EP1300493A1 (fr)
DE (1) DE50205759D1 (fr)
WO (1) WO2003031697A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10347006B4 (de) * 2003-10-07 2020-10-15 Hubert Hergeth Trichterabsaugung bei Fremdteilen
DE102007026464A1 (de) * 2007-06-05 2008-12-11 TRüTZSCHLER GMBH & CO. KG Vorrichtung zum Erkennen von störenden Partikeln, insbesondere Trashteilen, Nissen, Schalennissen, Noppen u. dgl., in textilem Fasergut, z.B. Baumwolle, Chemiefasern u.dgl., namentlich an Spinnereivorbereitungsmaschinen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE103069T1 (de) * 1988-10-11 1994-04-15 Rieter Ag Maschf Erkennung von fremdgut in textilfasern.
US5383135A (en) * 1992-12-31 1995-01-17 Zellweger Uster, Inc. Acquisition, measurement and control of thin webs on in-process textile materials
WO1996035831A1 (fr) * 1995-05-12 1996-11-14 Jossi Ag Procede et dispositif permettant d'identifier et de separer des corps etrangers contenus dans un materiau fibreux
CH689600A5 (de) * 1995-09-25 1999-06-30 H J Scheinhuette Entwicklungen Karde mit Vorrichtung zum Ausscheiden von Fremdfasern.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03031697A1 *

Also Published As

Publication number Publication date
WO2003031697A1 (fr) 2003-04-17
DE50205759D1 (de) 2006-04-13
EP1300493A1 (fr) 2003-04-09
EP1432854B1 (fr) 2006-02-01

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