US3701873A - Inductively heated godet - Google Patents

Inductively heated godet Download PDF

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Publication number
US3701873A
US3701873A US73004A US3701873DA US3701873A US 3701873 A US3701873 A US 3701873A US 73004 A US73004 A US 73004A US 3701873D A US3701873D A US 3701873DA US 3701873 A US3701873 A US 3701873A
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US
United States
Prior art keywords
shell
godet
radially
recessed
axially
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.)
Expired - Lifetime
Application number
US73004A
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English (en)
Inventor
Karl Bauer
Gerhard Martens
Herbert Schiminski
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.)
Oerlikon Barmag AG
Original Assignee
Barmag Barmer Maschinenfabrik 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.)
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Publication of US3701873A publication Critical patent/US3701873A/en
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Classifications

    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J13/00—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass
    • D02J13/005—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass by contact with at least one rotating roll
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
    • D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
    • D02J1/224—Selection or control of the temperature during stretching
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/14—Tools, e.g. nozzles, rollers, calenders
    • H05B6/145—Heated rollers

Definitions

  • ABSTRACT A godet assembly in which a rotated, inductively heated cylindrical godet shell is provided on its inner wall with radially recessed openings from which there extends an axially recessed opening, preferably triangular in a longitudinal section, a non-magnetic material of high electrical conductivity such as copper being 1 advantageously filled into these recessed openings in close adherent contact with the wall surfaces of the openings, such that. the openings and preferably with the embedded non-magnetic material are arranged radially and axially to maintain a uniform temperature on the outercircumferential surface of the shell.
  • the invention generally relates to an inductively heated godet fortextile machines or the like, e. g., for
  • lnductively-heatable godets of this type are generally known.
  • US. Pat. No. 3,412,228 describes a heating drum which consists of a freely rotatable hollow roller which is mounted for rotation at the end of a driven shaft.
  • a core of laminated iron plates In the interior of the hollow roller there is fixedly arranged a core of laminated iron plates, which concentrically surrounds the drive shaft and which is arranged on a machine frame or support in such a way that it does not participate in the rotation ofthe hollow roller.
  • the core carries one or more coils consisting of numerous windings whose connecting ends orelectrical lead wires are directed outwardly and connected with an alternating current source.
  • the coil forms the primary side of atransformenwhose secondary side is the hollow roller itself.
  • the described inductive heating arrangement would be suitable for generating a substantially uniform temperature over the entire-length of theshell circumference if the heat requirement of this shell were equally great at all points.
  • thisv is not the case, since more heat'is led off at the terminal ends of the shell than in its middle portion.
  • a strong temperature drop takes place at the two ends of the shell, for example in an amount of up to 30C., according to existing operating conditions.
  • the temperature distribution over the length of the godet shell can be substantially improved by one especially advantageous embodiment in which a plurality of annular rings composed of a non-inagnetizable material of high electrical conductivity are embedded in the inner wall of the cylindrical shell in a radially recessed portion thereof extending around the entire circumference of the'shell, at least one of the embedded annular rings being profiled to profile an axial projection therefrom of smaller radial thickness extending toward the adjacent terminal end of the shell, this projection being inthe form of an annular collar-like extension of the annular ring and also being embedded in a correspondingly axially recessed extension of the radially recessed portionv of the shell, each of such rings being so disposed axially and radially of the shell as to maintain the outer circumferential surface of the shell at a substantially uniform temperature while being heated.
  • the collarlike extensions of the annular rings adjacent the terminal ends are embedded in the inner wall of the cylindrical shell in a radially recessed portion thereof extending around the entire circumference of the'shell,
  • the individual annular rings with their collar-like projections are advantageously formed in the corresponding recesses by the powder spray process, which is well known, or they may also be formed by sintering and, in either of these processes, solidly joined with the godet shell.
  • the rings with their projections are constructed directly in the recesses of the godet shell and are simultaneously joined most intimately with the shell.
  • the recesses in the shell can be turned out in a likewise conventional manner according to a predetermined shape and configuration. Through these measures, it is assured that the heat transfer. from the embedded rings to the godet shell is consistent throughout the length and circumference of the shell.
  • FIG. 1 is a partly schematic and longitudinal sectional view through the axis of rotation of a preferred embodiment of the godet assembly according to the invention.
  • FIG. 2 is a graphical representation of various temperature profiles achieved with different shell constructions of the godet. 1
  • the godet 1 consists essentially of the cylindrical shell 2 which is freely rotatably magnetizable material, such as laminated iron plates.
  • the core 7 has a U-shaped cross-section which is constructed in the illustrated embodiment such that the two radial legs or shanks 8 and 9 are of equal length and terminate in close proximity to the inner wall of the godet shell 2.
  • the core 7, with the aid of a mounting bracket 10, is rigidly joined through the intermediate support 4a to the machine frame 4, so that it does not participate in the rotation of the godet shell 2 and its drive shaft 3.
  • the core 7 further carries a coil 11 consisting of several windings, whose terminal ends or lead wires 12 and 13 are directed out of the godet through a conduit 14 and connected with a source of alternating current which is shown schematically.
  • annular or circular rings 15 and 16 are embedded in the wall of the godet shell 2.
  • These annular rings bear, in the heating zone of at least one and preferably both terminal ends 17 and 18 of the godet shell, the axially recessed collar-like projections 19 which are composed of the same material as the rings 15 and 16 and which extend around the entire circumference of the shell 2.
  • These collar-like projections preferably have a triangular cross-section, as represented in FIG. 1, and are advanced so far into the terminal ends or zones 17 and 18 of the godet shell 2 as well as decreasing in thickness that the desired uniform temperature profile is closely approximated over the entire length of the heated godet.
  • the particular shape or configuration of the core 7 as represented in FIG. 1 has thus proved to provide especially favorable results in combination with profiled rings 15 and 16.
  • This core has two equally extended legs 8 and 9 providing an outside dimension 20 which corresponds, at least approximately to the length of the heatable godet shell 2.
  • the axial and radial arrangement of the collar-like projections 19 of rings 15 and 16, whether of triangular cross-section or some other shape, should then extend into the range or in the close vicinity of the maximal outside dimension 20 of the core legs. In this manner, the magnetic flux is compelled to permeate the godet shell 2 up to-the ends of its effective length'and to generate electrical currents by induction in this location, resulting in a short-circuit heating of the godet shell in its terminal zones.
  • the illustrated U-shaped configuration of the core furthermore has the purpose of assuring that no mechanical forces of any kind are transmitted to the bearings 21 or the shaft 3, which would be the case if, for example, there were to be used in place of the illustrated core 7, an elongated core such as is shown in U.S. Pat. No. 3,412,228.
  • mechanical forces would be transmitted to the shaft 3 and thereby the bearings 21 if the shanks had different lengths, in which case the longer shank would necessarily be positioned adjacent a projection or fitted into a recess of the godet shell.
  • the "radial gap thereacross reduces gradually frorn the radially recessed opening outwardly to an apex located in the terminal zone of the shell.
  • this gap of reducing dimensions preferably-overlaps the radially positioned legs of the wound core so as to provide a sharp constriction in the thickness'of the godet shell atits terminallyheated ends.
  • the corresponding constriction or displacement of the pathsof the magnetic flux through the shell at one and preferably both ends is in itself sufficient to generate a larger amount of heatwhere it is most required so as to bring about a very substantial linearization of the temperature profile along the length of the shell.
  • FIG. 2 The effect achieved with the illustrated embodiments of the godet shell: with the required recesses or embedded rings can be readily observed in FIG. 2.
  • the horizontal axis represents the length of the godet shell in centimeters.
  • the surface temperature in degrees Centigrade of the heated godet.
  • Curve 1 shows the temperature gradient ordinarily achieved over the length of the godet, i.e. when no turned recesses are present in the godet shell so that it has a uniform wall thickness. In this case, temperature differences of 20 and more appear between the ends of the godet and its midpoint. If, according to the invention, suitably turned or formed recesses are arranged in the interior of the godet shell as illustrated in FIG.
  • the godet shells of theinvention are relatively easily.
  • the godets of the invention permit a much more uniform heat treatment of transported threads, yarns and similar materials.
  • a godet assembly having a rotatable, cylindrical, inductively-heatable shell enclosing a stationary core of a ferromagnetic material wound with an induction coil with means to supply an alternating current to said coil for heating said shell, the improvement which comprises: I a i a core having a U-shaped cross-section defined by a base member extending along the axis of the godet and oppositely disposed radial legs extending outwardlytoward the terminal zone at either end of said shell; and
  • each of said annular rings being the projections of each annular ring have a substantially triangular cross-section as taken on a section longitudinally of the shell, the radial thickness of the projection reducing gradually up to an apex located in said I terminal zone at either end of said shell.
  • a godet assembly having a rotatable, cylindrical, inductively-heatable shell enclosing a stationary core of a ferromagnetic material wound with an induction coil with means to supply an alternating current to said coil for heating said shell, the improvement which comprises:
  • a core having a U-shaped cross-section defined by a base member extending along the axis of the godet and oppositely disposed radial legs extending outwardly toward the terminal zone at either end of said shell;
  • a shell whose inner wall contains a plurality of radially recessedopenings extending around the entire circumference of the shell, including a pair of such recessed openings adjacent said terminal zones, and an axially recessed opening of smaller radial dimension. extendingfrom one side of at least one of said pair of radially recessed openings into the adjacent terminal zone of said shellwith the terminal zone being disposed radially oppositely of its corresponding core leg, each of said recessed openings being so disposed axially and radially of the shell as to maintain the outer circumferential surface of said shell at a substantially uniform temperature while being heated.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
US73004A 1969-09-25 1970-09-17 Inductively heated godet Expired - Lifetime US3701873A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1948525A DE1948525C3 (de) 1969-09-25 1969-09-25 Induktiv beheizte Galette für Textilmaschinen oder dergl

Publications (1)

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US3701873A true US3701873A (en) 1972-10-31

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US73004A Expired - Lifetime US3701873A (en) 1969-09-25 1970-09-17 Inductively heated godet

Country Status (4)

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US (1) US3701873A (de)
CH (1) CH524778A (de)
DE (1) DE1948525C3 (de)
GB (1) GB1298483A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3790736A (en) * 1972-10-21 1974-02-05 Koshei Arita Heating rollers
US4208560A (en) * 1974-10-16 1980-06-17 Barmag Barmer Maschinenfabrik Ag Inductively heated godet
US4304975A (en) * 1976-10-21 1981-12-08 Barmag Barmer Machinenfabrik Ag Inductively heatable godet
US5254070A (en) * 1991-02-26 1993-10-19 Barmag Ag Godet
US5665043A (en) * 1994-11-10 1997-09-09 Barmag Ag Godet for heating and advancing yarns
US5763859A (en) * 1993-06-04 1998-06-09 Maschinenfabrik Rieter Ag Induction heating draw roller with vibration damping
WO2002095104A1 (de) * 2001-05-25 2002-11-28 Barmag Ag Galette
US6544157B1 (en) * 1999-06-29 2003-04-08 G. D S.P.A. Device for driving rollers in automatic machines
US20050092738A1 (en) * 2003-10-31 2005-05-05 Ring Edmund J. Inductive heating device including an inductive coupling assembly

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2952271C2 (de) * 1979-12-24 1982-12-23 Eberle Anlagen KG, 8500 Nürnberg Verfahren zur Montage und gleichzeitigen Einstellung des Kontaktnachlaufs bei einem Klappankerrelais
EP0235505B1 (de) * 1986-03-03 1990-07-18 TEIJIN SEIKI CO. Ltd. Kühlvorrichtung für die Lager einer Heizrolle
CH671243A5 (de) * 1986-08-18 1989-08-15 Mettler Soehne Maschf
DE4107719A1 (de) * 1991-03-11 1992-09-17 Barmag Barmer Maschf Lange galette

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3412228A (en) * 1964-11-21 1968-11-19 Tokushu Denki Kabushikikaisha Heating rotary drum apparatus
GB1172586A (en) * 1966-11-22 1969-12-03 Barmag Barmer Maschf Improvements relating to an Electrically Heated Godet

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3412228A (en) * 1964-11-21 1968-11-19 Tokushu Denki Kabushikikaisha Heating rotary drum apparatus
GB1172586A (en) * 1966-11-22 1969-12-03 Barmag Barmer Maschf Improvements relating to an Electrically Heated Godet

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3790736A (en) * 1972-10-21 1974-02-05 Koshei Arita Heating rollers
US4208560A (en) * 1974-10-16 1980-06-17 Barmag Barmer Maschinenfabrik Ag Inductively heated godet
US4304975A (en) * 1976-10-21 1981-12-08 Barmag Barmer Machinenfabrik Ag Inductively heatable godet
US5254070A (en) * 1991-02-26 1993-10-19 Barmag Ag Godet
US5763859A (en) * 1993-06-04 1998-06-09 Maschinenfabrik Rieter Ag Induction heating draw roller with vibration damping
US5665043A (en) * 1994-11-10 1997-09-09 Barmag Ag Godet for heating and advancing yarns
US6544157B1 (en) * 1999-06-29 2003-04-08 G. D S.P.A. Device for driving rollers in automatic machines
WO2002095104A1 (de) * 2001-05-25 2002-11-28 Barmag Ag Galette
US20050092738A1 (en) * 2003-10-31 2005-05-05 Ring Edmund J. Inductive heating device including an inductive coupling assembly

Also Published As

Publication number Publication date
CH524778A (de) 1972-06-30
DE1948525A1 (de) 1971-04-01
DE1948525C3 (de) 1975-09-25
DE1948525B2 (de) 1975-02-06
GB1298483A (en) 1972-12-06

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