EP0267620A1 - Cylindre pour le filage à friction - Google Patents

Cylindre pour le filage à friction Download PDF

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Publication number
EP0267620A1
EP0267620A1 EP87116745A EP87116745A EP0267620A1 EP 0267620 A1 EP0267620 A1 EP 0267620A1 EP 87116745 A EP87116745 A EP 87116745A EP 87116745 A EP87116745 A EP 87116745A EP 0267620 A1 EP0267620 A1 EP 0267620A1
Authority
EP
European Patent Office
Prior art keywords
friction spinning
spinning drum
sieve
support body
drum according
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Withdrawn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
EP87116745A
Other languages
German (de)
English (en)
Inventor
Herbert Stalder
Urs Keller
Werner Oeggerli
Emil Briner
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.)
Maschinenfabrik Rieter AG
Original Assignee
Maschinenfabrik Rieter 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 filed Critical Maschinenfabrik Rieter AG
Publication of EP0267620A1 publication Critical patent/EP0267620A1/fr
Withdrawn legal-status Critical Current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
    • D01H4/16—Friction spinning, i.e. the running surface being provided by a pair of closely spaced friction drums, e.g. at least one suction drum
    • D01H4/18—Friction drums, e.g. arrangement of suction holes

Definitions

  • the invention relates to a friction spinning drum in the manner of a hollow sieve drum designed for radial air passage.
  • Such friction spinning drums are used in the friction spinning process known per se, in which, as a rule, two cylindrical drums rotate close together in the same direction, at least one of the two friction spinning drums being a sieve drum.
  • the task of such a screening drum is to take up the fibers fed thereon in a manner known per se by means of an air stream and to turn them into a thread in the region of the gusset of the two drums, which is drawn off in a direction essentially perpendicular to the direction of rotation of the drums, ie essentially parallel to the axis of rotation of the screening drum.
  • the air flow required for conveying the fibers is pre-selected by means of an inside of the sieve drum suction nozzle through the holes in the sieve drum.
  • the holes of this sieve drum must have a diameter which essentially prevents too many fibers from being absorbed by these holes during storage on the sieve drum and thereby either being sucked off and lost or only at the edge of the Cut the suction nozzle mouth and thereby shorten it.
  • the energy requirement of such a system should be as small as possible, the air requirement making up a significant proportion of the energy requirement. It is therefore the aim to choose the hole diameter as large as possible from this point of view in order to obtain the lowest possible resistance for the required amount of air per unit of time.
  • the sieve drums must have their own rigidity in order not to experience any deformation during operation, which means a minimum wall thickness of these drums of at least 1.5 mm, if brass is used and, for example, if the drum diameter is 50 mm. required.
  • the object of the invention is therefore to find a sieve drum which can be manufactured inexpensively with sufficient inherent rigidity and small air resistance.
  • the invention solves this problem in that the spinning drum consists of an inner, perforated support body and an outer screen body attached to it.
  • the perforation of the support body advantageously has a larger hole cross section than the perforation of the screen body.
  • the supporting body is a rigid hollow body and the sieve body is a flexible body mounted thereon.
  • the sieve body can consist of a metal strip spirally drawn onto the support body or of a rectangular foil drawn onto the support body.
  • the screen body can be drawn onto the support body as a tubular film.
  • the perforations of the support body and of the screen body that result in the perforation can be coaxial.
  • an arrangement in which the number of perforations per unit area in the screen body is greater than the number of holes per unit area in the support body is also of great advantage.
  • the size and distribution of the holes in the support body can be selected according to the invention, taking into account the required strength of the support body, so that as many of the preferably evenly distributed perforations in the screen body offer air passage, ie are not blocked by the support body.
  • the advantages of the invention are that, on the one hand, the difficult to manufacture small hole diameters can be made in a relatively thin material, while the thick-walled support body can be provided with holes, which can have a cross-section that can be chosen according to the thicker wall more suitable for production.
  • the sieve body can be an expandable tape or film (even if the film is assembled into a tubular sieve body in a second operation), because this means that the side of the perforated film provided with the burrs as the outside of the sieve body can be selected, which offers the further advantage with a subsequent galvanic coating that the holes experience an expansion from the outside in.
  • This extension not only offers an advantage in terms of the pneumatic resistance of the individual hole, but dirt particles penetrating through the individual holes may not get stuck in the subsequent hole cross section.
  • a friction spinning drum 1 comprises a support body 2 with a screen body 3 mounted thereon, the type of which will be described later.
  • the support body 2 is designed as a hollow body and is firmly connected at one end to a stub shaft 4.
  • a shaft 5 belonging to the shaft end serves to receive a roller bearing 6, by means of which the friction spinning drum 1 is rotatably mounted.
  • a drive belt 7 engages the shaft 5 for driving the friction spinning drum.
  • the screen has body 3 sieve holes 8 and the support body 2 through holes 9.
  • a suction nozzle 10 provided at the opposite axial end of the friction spinning drum protrudes into the support body in a manner known per se and sucks air through the sieve and through-holes by means of a nozzle mouth (not shown) provided close to the cylindrical inner wall of the support body.
  • a suction arrangement is known per se from the friction spinning process and is therefore not described further.
  • the sieve holes 8 and the through holes 9 are provided in the support body 2 and in the sieve body 3 within a perforated area a marked with dash-dotted lines.
  • FIG. 2 shows a section of the support body 2 and the screen body 3 marked A in FIG. 1, in which the wall thickness of the support body 2 is marked with a W and the wall thickness of the screen body 3 with a V.
  • the manufacturing ridges 11, which are exaggerated for clarification, are directed against the outside of the friction spinning drum.
  • the screen body is coated on its cylindrical outer surface with a galvanic layer 12, for example by hard chromium plating, possibly with Cu or Ni intermediate layers, which for physical reasons builds up around the manufacturing burrs more than in the adjacent parts.
  • the galvanic layer also builds up in a preselected layer thickness with respect to the wall thickness V of the screen body 3 Kind in the depth of the sieve holes, as shown in Fig. 2, so that the sieve holes take a diffuser-like shape.
  • Another advantage of the reinforced structure of the galvanic layer around the manufacturing ridge is that a small ring-shaped elevation is created around each sieve hole, which improves the frictional relationships of the surface of the sieve body 3.
  • the wall thickness W of a support body made of brass shown in FIG. 2 can be 1.5 to 2 mm
  • the wall thickness V of a screen body made of a nickel-chromium alloy can be 0.5 to 0.8 mm.
  • the thickness of the galvanic layer in the surface parts between the ring-shaped elevations is approximately 0.2 mm.
  • the through holes 9 have a larger cross section than the smallest cross section of a sieve hole.
  • the smallest cross section of the sieve hole can have a diameter of 0.5 mm and the diameter of the through hole can be 0.8 or 1.0 mm, depending on the hole spacing, so that the supporting body still has enough material between the through holes so that it fulfills its task from the standpoint of strength can.
  • the sieve holes are arranged coaxially with the through holes, but this is not absolutely necessary. There is definitely the possibility of providing significantly larger through holes which do not have the same pitch as the sieve holes, whereby the spacing of the hole centers is to be understood as the pitch. Such embodiments will be described later in connection with FIG. 8.
  • the sum of all cross sections of the perforations 9 of the support body 2 which result in the perforation has a larger proportion of the total area of the perforated area a than the sum of all cross sections of the holes 8 of the sieve body 3.
  • the screen holes do not necessarily have to have a round cross section, but that other shapes are possible, in particular if the manufacturing process is a stamping process. 4 shows square sieve holes, but could also be holes with other shapes. The same applies to the through holes if a different method is used instead of the drilling method to obtain the through holes in the support body 2, for example an injection molding process.
  • FIGS. 5, 6 and 7 show different types of how the screen body 3 can be shaped and fitted onto the support body 2.
  • Fig. 5 has a band-shaped sieve body 3a, which is wound spirally on the support body and connected to it by any type of connection.
  • the type of connection can be gluing, for example, by gluing the beginning and the end in the zones outside the perforated area a to the supporting body.
  • the spiral winding is carried out in such a way that the band body windings touch each other in order to avoid air passage at this contact point 13.
  • the sieve body 3b consists of a rectangular film, which, when placed on the support body 2, rests tightly thereon without forming a substantial distance in the connecting joint 14.
  • the joint can also be welded with a laser beam.
  • the sieve body 3c consists of a hollow body which is made of a material which has a smaller coefficient of expansion than the support body, ie the support body is selected from a material since the selection of the material for the sieve body has first priority, which has a larger coefficient of expansion than the screen body 3c.
  • the latter and the support body 2 are cooled to a temperature which is substantially below the normal ambient temperature, so that the support body 2 shrinks more when cooling than the screen body 3c, which enables the screen body 3c to be pushed onto the support body 2 without any problems .
  • the outer diameter of the support body 2 is selected in comparison to the inner diameter of the screen body 3c such that when heated to normal temperature (not yet operating temperature), the screen body 3c lies snugly and without rotation on the support body 2. When heated to operating temperature, a precalculated tension is created in the screen body 3c.
  • the holes 9 a much larger opening cross section than the perforations 8 in the supporting body 2 in the sieve body 3 so that a large number of perforations 8 come to lie above each through hole 9.
  • the perforations have a cross-sectional widening in the radially inward direction, so that blockage of these holes can be effectively avoided.
  • a galvanic coating of the holes in the screen body is also provided here, but is not shown for the sake of illustration.
  • a plasma coating could also be applied to the galvanic coating here, a coating of aluminum oxide or nickel diamond being preferred as the plasma coating.
  • the holes in the support body can be formed by mutually intersecting longitudinal grooves and circumferential grooves, the longitudinal grooves preferably being formed in the interior of the cylindrical hollow body forming the support body and the circumferential grooves being present in the outer surface of the hollow body.
  • the circumferential grooves can advantageously have the shape of a thread.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Filtering Materials (AREA)
EP87116745A 1986-11-13 1987-11-12 Cylindre pour le filage à friction Withdrawn EP0267620A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH454286 1986-11-13
CH4542/86 1986-11-13

Publications (1)

Publication Number Publication Date
EP0267620A1 true EP0267620A1 (fr) 1988-05-18

Family

ID=4278025

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87116745A Withdrawn EP0267620A1 (fr) 1986-11-13 1987-11-12 Cylindre pour le filage à friction

Country Status (4)

Country Link
US (1) US4848079A (fr)
EP (1) EP0267620A1 (fr)
JP (1) JPS63135525A (fr)
IN (1) IN169975B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104726973A (zh) * 2015-01-28 2015-06-24 南通新源特种纤维有限公司 摩擦纺纱机用筛网

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104651989A (zh) * 2015-01-28 2015-05-27 南通新源特种纤维有限公司 纺纱辊

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2943063A1 (de) * 1978-10-26 1980-05-08 Platt Saco Lowell Ltd Offen-end-spinnvorrichtung
GB2074201A (en) * 1980-04-19 1981-10-28 Platt Saco Lowell Ltd Friction Spinning Rollers

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS209209B1 (en) * 1978-05-17 1981-11-30 Stanislav Didek Method of yarn friction spinning based on spinning with open end and apparatus used for execution of the said method
US4358922A (en) * 1980-04-10 1982-11-16 Surface Technology, Inc. Metallic articles having dual layers of electroless metal coatings incorporating particulate matter
US4358923A (en) * 1980-04-10 1982-11-16 Surface Technology, Inc. Composite coatings for open-end machinery parts
DE3114093C2 (de) * 1980-04-19 1986-06-05 Hollingsworth (U.K.) Ltd., Accrington, Lancashire Walze für eine Friktionsspinnvorrichtung
EP0098380B1 (fr) * 1981-02-21 1987-07-15 Hollingsworth (U.K.) Limited Dispositif de filage par friction
EP0109236B2 (fr) * 1982-11-09 1988-07-06 Hollingsworth (U.K.) Limited Cylindres avec aspérités pour machine à filer à friction
DE3315777A1 (de) * 1983-04-30 1984-11-29 W. Schlafhorst & Co, 4050 Mönchengladbach Spinnvorrichtung
DE3527212A1 (de) * 1985-07-30 1987-02-12 Schubert & Salzer Maschinen Verfahren und vorrichtung zum offenend-friktionsspinnen
JPH06147080A (ja) * 1992-11-04 1994-05-27 Suzuki Motor Corp Ａｔ車用点火時期制御装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2943063A1 (de) * 1978-10-26 1980-05-08 Platt Saco Lowell Ltd Offen-end-spinnvorrichtung
GB2074201A (en) * 1980-04-19 1981-10-28 Platt Saco Lowell Ltd Friction Spinning Rollers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104726973A (zh) * 2015-01-28 2015-06-24 南通新源特种纤维有限公司 摩擦纺纱机用筛网
CN104726973B (zh) * 2015-01-28 2017-07-25 南通新源特种纤维有限公司 摩擦纺纱机用筛网

Also Published As

Publication number Publication date
US4848079A (en) 1989-07-18
IN169975B (fr) 1992-01-18
JPS63135525A (ja) 1988-06-07

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Inventor name: OEGGERLI, WERNER

Inventor name: STALDER, HERBERT

Inventor name: KELLER, URS

Inventor name: BRINER, EMIL