EP2463415A2 - Method of production of spinning rotor for an open-end spinning device and such spinning rotor - Google Patents

Method of production of spinning rotor for an open-end spinning device and such spinning rotor Download PDF

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Publication number
EP2463415A2
EP2463415A2 EP11190520A EP11190520A EP2463415A2 EP 2463415 A2 EP2463415 A2 EP 2463415A2 EP 11190520 A EP11190520 A EP 11190520A EP 11190520 A EP11190520 A EP 11190520A EP 2463415 A2 EP2463415 A2 EP 2463415A2
Authority
EP
European Patent Office
Prior art keywords
spinning
rotor shaft
spinning cup
rotor
opening
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.)
Withdrawn
Application number
EP11190520A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jirí Klimes
Milos Mládek
Josef Ludvícek
Frantisek Kríz
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.)
Rieter CZ sro
Original Assignee
Rieter CZ sro
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 Rieter CZ sro filed Critical Rieter CZ sro
Publication of EP2463415A2 publication Critical patent/EP2463415A2/en
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/04—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques imparting twist by contact of fibres with a running surface
    • D01H4/08—Rotor spinning, i.e. the running surface being provided by a rotor
    • D01H4/10—Rotors

Definitions

  • the invention relates to the method of production of spinning rotor for an open-end spinning machine, at which the spinning cup and the rotor driving shaft are produced separately, where a semi-product of a body of the spinning cup with finish allowances is produced, the finishing of this body is performed, next to this the rotor driving shaft with a central threaded opening in the face on the side designated for connection with the spinning cup and with allowances for further finishing of its outer surfaces is produced, heat treatment and finishing of the shape of this shaft are performed, at the same time the size of diameter of central cylindrical opening in the body of the spinning cup and size of diameter of respective cylindrical section of the rotor driving shaft are mutually created in specified tolerances.
  • the invention also relates to the spinning rotor of an open-end spinning machine comprising the spinning cup and rotor driving shaft, whose co-axial connection is created by a cylindrical opening in the hub of the spinning cup and the outer cylindrical surface of the rotor driving shaft and whose mutual attachment is performed by a safety screw and a thread of threaded opening in axis of the rotor driving shaft, whwreas the rotor driving shaft is provided with means for its rotatable mounting with respect to the body of the spinning device and means for coupling with the rotary drive.
  • Spinning rotor at common embodiments of open-end spinning devices is created of a spinning cup, which is arranged at the end of the rotor driving shaft with which it creates one integral unit.
  • the driving shaft is mounted in wedge gaps performed between one after another arranged pairs of rotatablymounted supporting discs.
  • the drive of the shaft is mediated through the driving belt, by which the shaft is partially embraced usually in its centre section between the pairs of supporting discs.
  • the driving shaft is mounted in a double-row ball bearing with a great spacing of ball races, whereas the inner bearing races are usually created directly in cylindrical surface of the driving shaft, which is heat treated and finished in a corresponding manner.
  • the drive of the driving shaft also in this embodiment is mediated through the driving belt, which nevertheless acts on the shaft in vicinity of its end being reverse from the spinning cup.
  • the spinning rotor is a two-piece one, at the same time the spinning cup with the driving shaft is connected in a fixed manner, mostly by a pressed interference fit. Also in cases when there is additionally used e.g. the screw joint, where the rotor cup to the driving shaft is moreover attached in axis of the shaft by means of a screw, the stiffness of the joint is realised by means of an interference of a hub of the spinning cup and the rotor driving shaft.
  • DE 4020518 A1 proposes a two-piece rotor, whose driving shaft in vicinity of the end designated for positioning of a spinning cup is provided with a wider flat collar, which is welded to the shaft, or it is forged with the shaft as one piece and similarly, a section of the shaft between the collar and the adjacent end of shaft creates a faying surface for mounting of the fitted opening of a hub of the spinning cup. After pressing-in this surface abuts with its face to the collar, after which it is axially secured towards the shaft by means of a spring washer. It is advantageous that for example one type of the shaft may be used for various types of spinning cups. After assembly, the spinning rotor is being balanced.
  • the spinning cup is fixed on a cylindrical surface of an adapter which is arranged in cavity of bearing shaft of the spinning rotor and which is at its end opposite from the spinning cup connected with axle.
  • the bearing shaft is mounted in a form of aerostatic bearing in the body of the device, while the adapter in vicinity of the spinning cup is in the body mounted by means of grease-lubricated radial sliding bearing with a great play.
  • Mutual mounting of the spinning cup and adapter seems to be insufficiently strong, the whole arrangement is very complicated and probably requires balancing of the unit spinning cup - adapter - bearing shaft.
  • the goal of the invention is to remedy or at least reduce shortcomings of the background art, to provide possibility of independent replacement of the rotor driving shaft with bearing, possibly of the spinning cup, at the same time to create a rigid and reliable connection of the spinning cup and the rotor driving shaft which would enable a safe operation of the spinning device on a long term basis.
  • the goal of the invention has been achieved by the method of production of the spinning rotor for an open-end spinning machine, at which the spinning cup and rotor shaft are produced separately, whose principle consists in that, the spinning cup and rotor shaft are at first separately dynamically balanced, after then the spinning cup is installed through the central opening on the corresponding cylindrical section of rotor shaft, then both sections are mutually secured by screwing-in the safety screw into a central threaded opening in the face of rotor shaft, at the same time the tolerance in size of diameter of the central cylindrical opening in a body of the spinning cup and of diameter of the respective cylindrical section of the rotor shaft are within the range of transition fit.
  • the created connected unit is not balanced any more. If one of these parts is damaged, this part can be replaced while the undamaged part may be used, and the assembled unit is already dynamically balanced.
  • the bonding cement is applied on mating surface of the central cylindrical opening in body of the spinning cup and/or on a mating surface of outer cylindrical surface of rotor shaft.
  • the joint is a fixed one also in a case that the transition fit is performed with radial play.
  • the goal of the invention has also been achieved through the spinning rotor of an open-end spinning machine whose principle consists in that, the rotor shaft and the spinning cup are formed of independently dynamically balanced bodies, which after assembly represent a dynamically balanced unit. Upon damage of one of the parts of the spinning rotor this arrangement enables to replace this part only and to further use the undamaged part.
  • Exemplary embodiment of the spinning rotor with bearing of the rotor driving shaft according to the invention is schematically represented in figure in a side view with partial axial section.
  • Spinning rotor 1 for an open-end spinning device comprises two parts, which are the spinning cup 11 and rotor shaft 12 and which are together axially connected in a fixed manner.
  • the spinning cavity 111 of the spinning cup 11 from the face side is provided with the face opening 112 , whereas the greatest diameter of the spinning cavity 111 creates the known collecting groove 113 of fibres.
  • countersink 114 which is connected with exterior of the spinning cup 11 by the known ventilation openings 115 .
  • the spinning cup 11 is without ventilation openings 115.
  • the spinning cavity 111 continues into a short counterbore 116 which is finished with a circumferential protrusion 117. From the back side in the face of the spinning cup 11 towards the protrusion 117 a cylindrical opening 118 is performed.
  • the rotor shaft 12 is in a known manner rotatably mounted in the not represented body of the spinning device, at the same time it itself creates the inner part of double-row rolling ball bearing 2.
  • the surface of rotor shaft 12 is in a known manner provided with two in a greater spacing arranged inner circumferential ball races 123, while the outer ball races are performed in a bushing 21 of the bearing 2.
  • the balls 22 are running in cages 23 and the inner space of the bearing 12 is closed with seals 24, while bushing 21 of the bearing 2 is provided with a not represented opening for refilling of the grease.
  • the end 124 of rotor shaft 12 extending from bushing 21 of the bearing 2 on the side opposite from the spinning cup 11 creates a surface for embracement with a not represented driving belt 4.
  • Production method of the spinning rotor 1 according to the invention also comprises known steps for production of semi-product of the spinning cup 11, machining of its outer shape, possibly of ventilation openings 115 , counterbore 116 and of axial cylindrical opening 118 .
  • the diameter of axial cylindrical opening 118 is produced in tolerance specified for transition fit.
  • the known steps for production of the rotor shaft 12 comprise a rough machining of its outer shape and of threaded opening 121 . After then the corresponding heat treatment of produced semi-product and the finishing operations of machining follow, at the same time the diameter of outer cylindrical surface 122 is produced in tolerance specified for transition fit.
  • the diameters of the cylindrical opening 118 in the spinning cup 11 and of the outer cylindrical surface 122 of rotor shaft 12 are measured using respective known measuring instruments.
  • the safety screw 3 is tightened by a specified tightening torque, and/or the securing bonding cement possibly special glue for threaded joints is applied on the thread.
  • the securing bonding cement possibly special glue for threaded joints is applied on the thread.
  • the spinning cup 11 may be heated to the temperature of 80 to 100°C.
  • the production tolerances may be preferably reduced so that in all cases the transition fit with this reduced tolerances will show the necessary interference.
  • Possible replacement of one of the parts of the assembly pair spinning cup 11 - rotor shaft 12 is conditioned by the fact, that there is preserved quality of mating surface of the part which will be further operated. This has been achieved through the mentioned structure of safe connection of two surfaces which may be mutually separated without deteriorating damage of the mating surfaces.
  • the disassembly may usually be performed under cold conditions using a puller when exerting a relatively small force with respect to a small interference in mounting.
  • removal of the spinning cup may further be facilitated through its warming approximately to the temperature of 80 to 100°C and thus practically eliminating the possibility that the mating surfaces are damaged. Further condition is preserving of a dynamic balancing of the assembled assembly pair spinning cup 11 - rotor shaft 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP11190520A 2010-12-10 2011-11-24 Method of production of spinning rotor for an open-end spinning device and such spinning rotor Withdrawn EP2463415A2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CZ20100921A CZ2010921A3 (cs) 2010-12-10 2010-12-10 Zpusob výroby sprádacího rotoru pro bezvretenové doprádací zarízení a sprádací rotor

Publications (1)

Publication Number Publication Date
EP2463415A2 true EP2463415A2 (en) 2012-06-13

Family

ID=45421833

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11190520A Withdrawn EP2463415A2 (en) 2010-12-10 2011-11-24 Method of production of spinning rotor for an open-end spinning device and such spinning rotor

Country Status (2)

Country Link
EP (1) EP2463415A2 (cs)
CZ (1) CZ2010921A3 (cs)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2832903A1 (de) * 2013-07-31 2015-02-04 Maschinenfabrik Rieter Ag Offenend-Spinnrotor mit einer Rotortasse, einem Rotorschaft sowie einer Kupplungsvorrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4020518A1 (de) 1990-06-28 1992-01-02 Schubert & Salzer Maschinen Offenend-spinnrotor
DE10022736A1 (de) 2000-05-10 2001-11-15 Schlafhorst & Co W Magnetlageranordnung für eine Offenend-Spinnvorrichtung
CZ289599B6 (cs) 1994-11-29 2002-03-13 Gerhard Wanger Vřeteno pro loľisko mazané plynem rychle se otáčejícího nástroje

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4020518A1 (de) 1990-06-28 1992-01-02 Schubert & Salzer Maschinen Offenend-spinnrotor
CZ289599B6 (cs) 1994-11-29 2002-03-13 Gerhard Wanger Vřeteno pro loľisko mazané plynem rychle se otáčejícího nástroje
DE10022736A1 (de) 2000-05-10 2001-11-15 Schlafhorst & Co W Magnetlageranordnung für eine Offenend-Spinnvorrichtung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2832903A1 (de) * 2013-07-31 2015-02-04 Maschinenfabrik Rieter Ag Offenend-Spinnrotor mit einer Rotortasse, einem Rotorschaft sowie einer Kupplungsvorrichtung
EP3153611A1 (de) * 2013-07-31 2017-04-12 Maschinenfabrik Rieter Ag Rotortasse für einen offenend-spinnrotor mit einer kupplungsvorrichtung
US9689090B2 (en) 2013-07-31 2017-06-27 Maschinenfabrik Rieter Ag Open-end spinning rotor with a rotor cup, a rotor shaft and a coupling device

Also Published As

Publication number Publication date
CZ2010921A3 (cs) 2012-06-20

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