US3205645A - Spinning pot of centrifugal spinning machine - Google Patents

Spinning pot of centrifugal spinning machine Download PDF

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Publication number
US3205645A
US3205645A US289573A US28957363A US3205645A US 3205645 A US3205645 A US 3205645A US 289573 A US289573 A US 289573A US 28957363 A US28957363 A US 28957363A US 3205645 A US3205645 A US 3205645A
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United States
Prior art keywords
yarn
container
pot
spinning
layers
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Expired - Lifetime
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US289573A
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English (en)
Inventor
Kato Akira
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.)
Mitsubishi Engineering and Shipbuilding Co Ltd
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Mitsubishi Engineering and Shipbuilding Co Ltd
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H7/00—Spinning or twisting arrangements
    • D01H7/02—Spinning or twisting arrangements for imparting permanent twist
    • D01H7/74—Cup or like arrangements
    • D01H7/82—Casings or guards for rotary cups or the like
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D7/00—Collecting the newly-spun products
    • D01D7/02—Collecting the newly-spun products in centrifugal spinning pots
    • 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
    • D01H1/08—Spinning or twisting machines in which the product is wound-up continuously cup, pot or disc type, in which annular masses of yarn are formed by centrifugal action

Definitions

  • This invention relates generally to centrifugal spinning machines such as spinning frames, twisting machines or the like and more particularly to a spinning pot for such a machine operative when rotating at a high speed to twist and wind a bundle of fibers such as roving or yarn on the internal peripheral surface thereof by utilizing the centrifugal force due to its rotational movement.
  • each yarn is twisted and wound on the internal peripheral surface of a spinning pot of cylindrical shape rotating at a high speed by drawing the same out from the free end of a yarn guiding tube which is vertically reciprocable within the spinning pot, along the longitudinal axis thereof.
  • the winding operation can be ceased and a rewinding tube inserted coaxially into the interior of the spinning pot. Then the roll of yarn formed on the inside of the spinning pot is rewound on the outer surface of the rewinding tube to form the finished cop which, in turn, may be removed from within the pot.
  • the angle formed between the path of ascending yarn and the subsequent path of descending yarn or the angle formed between a pair of succeeding traverse sections in the traverse motion which may be called a traverse angle should be relatively small or acute. Also the angle (spinning angle) between the internal peripheral surface of the pot and the surface formed by the upper ends of the yarn layers is preferably small.
  • the yarn may be displaced in such a direction that the inside diameter of the roll is increased, and when any small vibration displaces a portion or portions of the yarn in that direction the centrifugal force is higher on the displaced portion or portions of the yarn than the other portions thereof and promotes further displacement of the displaced portion or portions of the yarn until a small chord or chords of the yarn are formed on said displaced portion or portions.
  • the roll of yarn layers thus formed on the internal surface of the pot is rewound on a rewinding tube entanglement of the yarn frequently occurs.
  • the yarn can be wound within the pot on tilted surfaces on which the yarn can not at all be displaced in a direction such that the inside diameter of the yarn roll is increased.
  • the yarn must be wound on a completely circularly cylindrical surface.
  • the yarn fed at a uniform velocity into the cylindrical pot should have a traverse motion having a uniform speed and a predetermined fixed amplitude to thereby be wound to a uniform thickness on the cylindrical surface, and the upper ends of the wound yarn layers should be shifted gradually downward to form a surface tilted relatively to the cylindrical surface at an angle suitable for the type and size of the finished yarn with each yarn layer to be superposed 32%,545 Patented Sept. 14:, I965 "ice being always maintained on a circularly cylindrical surface.
  • the conventional type of spinning pots heretofore proposed include a right cylindrical pot comprising a hollow cylindrical member having its upper end open and its lower end closed and a conical-cylindrical pot comprising a hollow cylindrical member open at its upper end and a hollow, truncated conical member connected on its enlarged end to the cylindrical member at its lower end with the tilted angle of the conical surface approximating the required spinning angle.
  • the object of the invention is to provide .an improved spinning pot for a centrifugal spinning machine having a profile ensuring that a yarn can be wound in layers on t the internal peripheral surface of the spinning pot without any shift of the wound yarn occurring and hence that the roll of yarn formed on the internal peripheral surface of the pot can be rewound on a rewinding tube inserted within the pot without entanglement, shift and break of the yarn.
  • FIG. 1 is an elevational view, partly in longitudinal section of a spinning pot of a prior art type with the lefthand half illustrating fragmentarily the step of taking up a yarn while the righthand half illustrates fragmentarily the finished cop of yarn formed on a rewinding tube;
  • FIG. 2 is a view similar to FIG. 1 but illustrates another spinning pot of a prior art type
  • FIG. 3 shows, partly in longitudinal section and partly in elevation, a spinning pot constructed in accordance with the teachings of the invention and its associated components;
  • FIGS. 4 and 5 are fragmental sectional views illustrating the manner in which cops of different shapes may be formed on rewinding tubes by using the spinning pot illustrated in FIG. 3.
  • the pot designated by the reference numeral 1 comprises a hollow, right cylindrical member open at the upper end, having a bottom plane and adapted to be rotated at a high speed.
  • a yarn guiding tube 2 Coaxially disposed in the hollow portion of the pot 1 is a yarn guiding tube 2 for vertically reciprocal movement.
  • the yarn guiding tube 2 is surrounded by a supporting tube 3 which, in turn, is surrounded by a rewinding tube 4.
  • a bundle of fibers such as a yarn 5 to be twisted and wound is fed int-o the hollow portion of the pot 1 rotating at a high speed through the free end of the yarn guiding tube 2 being reciprocally moved along the longitudinal axis of the pot 1 whereby the yarn is twisted and wound in layers on the internal peripheral surface of the h pot 1.
  • the yarn is wound on that portion of the internal wall surface of the pot. 1 positioned between an upper.
  • the yarn guiding tube 2 is designed and arranged such that the range over which the same is reciprocally moved in the vertical direction is gradually lowered as the operation proceeds. Accordingly, the upper end of the yarn wound on the internal wall surface of the pot 1 is displaced along the line AC while the lower end thereof is displaced along the line BD. Eventually, the yarn is wound in lengths from the point C through the point E to the point D and forms .a roll of yarn layers 6.
  • dv/dt represents the speed at which the yarn is fed into the pot or the yarn volume sucked into the same per unit time dh/dt the length through which the uppermost point of the vertically reciprocal stroke for the yarn is lowered per unit time, I the length of that reciprocal stroke and r the distance between the longitudinal axis of the pot and any point on a curved surface of rotation on which the yarn is wound, or the radius of that surface.
  • dv 1 m 1 where k is a constant
  • Equation 4 represents the curve AC (see FIG. 1) which is the generatrix for the curved surface formed by the adjacent upper ends of the wound yarn layers on the internal wall surface of the pot. It is apparent that the constants K and K depend upon the yarn feeding speed, the speed of the traverse motion, the radius at which the yarn is initially wound within the pot, etc.
  • the envelope surface ED for the lower end of the traverse motion of the yarn will be aifected by parameters such as the resistance of air and the like similar to those affecting the envelope surface for the upper end thereof then the curve ED has to be a mirror image of the curve AC.
  • the lower end of the initial yarn layer begins at the point B and the lower ends of the succeeding yarn layers form, a tilted surface gradually increasing in area until the same forms the surface ED.
  • any vibrational movement tends to cause shift of the yarn on the lower envelope surface due to the lower ends of the yarn layers resulting in the formation of many small chords of yarn.
  • this tendency for the yarn to form the small chords is enhanced by the upward flow of air spouted by the yarn guiding tube 2 and passing along the internal wall surface of the pot 1 as illustrated by the arrows in FIG. 1.
  • the yarn being rewound is entangled at many points thereof.
  • FIG. 2 wherein like reference numerals designate components similar to those illustrated in FIG. 1 the arrangement is similar to that shown in FIG. 1 except that the lower portion of the hollow cylindrical member is in the form of a truncated conical surface 8 with the tilted angle approximating the required spinning angle.
  • the yarn is initially wound on that portion of the internal wall surface of the pot 1 between the point A and the 1 surface such as the envelope surface ED shown in FIG. 1
  • the point E protrudes.
  • the protuberance at this point E is enhanced by the fiow of air spouted by the yarn guiding tube 2 and pass ing upwardly along the internal wall surface of the cylindrical member.
  • the point E will greatly protrude for the reason that, as the radius at which the yarn is wound decreases the yarn layer is reduced in apparent density. Consequently, a tilted surface similar to the envelope surface ED shown in FIG. 1 is locally formed in the arrangement illustrated in FIG. 2. Therefore it will be. appreciated that the cop of yarn 7 formed onthe rewinding tube 4 involves entanglement of the yarn at many points thereof.
  • Equation 4 The foregoing discussion based upon Equation 4 has been made on the assumption that the yarn layers have a constant apparent density throughout the roll. It will be appreciated that, because of both the tension of the yarn being wound and the centrifugal force applied to a particular yarn layer, the yarn being wound has a higher apparent density at a larger spinning radius that at a smaller radius.
  • a yarn spun in a spinning potrotating at an angular velocity of from 1500 to 2500 radians per second and having a spinning radius of from 2 to 7.5 centimeters has an apparent density ranging from 0.2 to 0.6 gram per cubic centimeter. Within this range of density the spun yarn can be considered to have an average density substantially directly proportional to the taking up radius.
  • the yarn layers wound on that wall surface will include formed on the lower end portion a protuberance which, in turn, makes it difficult to satisfactorily rewind the yarn on a rewinding tube. Consequently, entanglement of the yarn is likely to occur on that portion of the rewound yarn on the rewinding tube corresponding to the lower end portion of the yarn layers wound on the inside of the pot.
  • the invention contemplates the prevention of the aforesaid protuberance by forming the lower end portion of the internal wall surface of the pot into a special curved surface.
  • that portion of the internal wall surface of the spinning pot positioned below the point which the lower ends of the yarn layers wound on the surface reach at the beginning of a yarn winding operation is chosen to coincide in configuration with the surface formed by the upper ends of the yarn layers.
  • that portion of the lower internal wall surface on which the lower end portions of the yarn layers are adapted to be wound comprises a surface of rotation whose generatrix follows a curve represented by the aforesaid equation 4 or 5 or a curve somewhat modified from the same.
  • This measure permits the innermost layer of yarn being wound to be always maintained as a circularly cylindrical surface whereby, during its vertically reciprocal movement the yarn being wound has continuously applied thereto a uniform centrifugal force with the result that the yarn is wound in a close roll while preventing substantially the occurrence of the protuberance as previously described.
  • the spinning pot designated by the reference numeral 1 comprises a right cylindrical member open at the upper end and including a cup-shaped bottom. More specifically, spinning pot 1 has its internal wall in the form of a right cylindrical surface except that its lower portion between points B" which are the lower limit of taking up stroke at the beginning of the operation and points D" which are the lower limit of the same at the end of the operation is formed into a curved surface substantially equal in configuration to the curved surface A C formed by the upper ends of the yarn layers wound on the inside of the pot. In other words, the portion B"D of the internal wall surface is substantially equal in configuration to a surface of rotation whose generatrix is expressed by the aforesaid Equation 4 or 5.
  • the yarn guiding tube 2 inserted within the pot 1 along the longitudinal axis is vertically reciprocated at a uniform speed by means of a lift device (not shown) which movement has a predetermined fixed amplitude equal to the length A"B.
  • a lift device not shown
  • the yarn is first wound on that surface through lengths between the point A" and the point B" and eventually it is wound on a surface C"E"D to thereby form a roll of yarn layers 6.
  • the roll of yarn layers 6 has its exposed surface C"E"D" rectilinear and includes no protuberance.
  • annular spacing is formed between the rewinding tube 4 and the roll of yarn layers 6 formed on the inside wall of the pot 1 so as to have a uniform width throughout the entire length.
  • This annular spacing of uniform width ensures that the flow of air passing through said spacing is prevented from locally accelerating and hence from aiding in the formation of a protuberance on the lower end portion of the roll of yarn layers 6 as in the conventional type of spinning pots.
  • FIG. 4 shows a cop 7 formed on a rewinding tube 4 by rewinding on the same the roll of yarn layers 6 as shown in FIG. 3.
  • curve FGHI in FIG. 4 the cop has an outer surface whose generatrix consists of three curves FG, GH and HI merging into each other. It has been found that the cop does not involve entanglement of yarn nor disturbance of yarn layers.
  • the tension under which a yarn is being rewound depends upon the inside diameter of the yarn roll 6 wound on the internal wall surface of the pot 1, the outside diameter of the rewinding tube 4 on which a cop is to be rewound or of the cop being formed on the tube and the speed of rotation of the pot.
  • the roll of yarn layers 6 wound on the internal wall surface of the pot 1 is not abruptly changed in inside diameter thereby resulting in small variation in the tension of the yarn being rewound, which tension is normally doubled by variation in such inside diameter. This ensures that yarn breaking is minimized.
  • the rewinding tube shown in FIG. 5 is similar to that illustrated in FIG. 4 expect that its upper portion 9 is in the form of a truncated cone with the reduced end rigidly secured to the main body of the tube.
  • the purpose of this conical portion is to form a cop whose upper surface "portion F6 is vertically aligned with the middle surface portion GH.
  • a container of circular cross section rotating about its axis at a constant high speed
  • a yarn guide tube extending axially into said container for feeding a bundle of fibres into said container at a constant rate, said fibres being twisted as yarn and deposited in successive layers on the inner surface of said container by centrifugal force
  • said guide tube being reciprocated longitudinally relative to said container at a predetermined uniform speed through a stroke of constant length to distribute said spun fibres along the length of the container, the upper and lower limits of movement of said guide tube being progressively lowered relative to said container at a uniform rate as layers of said spun fibre are deposited in the container, whereby the upper ends of successive layers generate a substantially parabolic curve as viewed in an axial section through the container, the inner peripheral surface of the container in the range between initial upper and lower limits of the travel of said guide tube being cylindrical and the lower portion of the inner peripheral surface of the container in the range between the initial and final lower limits of the travel of said guide tube being substantially parabolic and cor

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US289573A 1962-12-25 1963-06-21 Spinning pot of centrifugal spinning machine Expired - Lifetime US3205645A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5867762 1962-12-25

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US3205645A true US3205645A (en) 1965-09-14

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US (1) US3205645A (en:Method)
BE (1) BE641645A (en:Method)
ES (1) ES289690A1 (en:Method)
GB (1) GB1041827A (en:Method)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4103771A1 (de) * 1991-02-08 1992-08-13 Schlafhorst & Co W Verfahren und einrichtung zum herstellen eines fadens nach dem zentrifugenspinnverfahren
US5289675A (en) * 1991-03-19 1994-03-01 W. Schlafhorst AgG & Co. Pot spinning assembly with movable pot
US5515672A (en) * 1993-07-17 1996-05-14 W. Schlafhorst Ag & Co. Transport system in a pot spinning machine
US5613355A (en) * 1994-07-29 1997-03-25 Schlafhorst Ag & Co. Method for rewinding a spinning cake in a pot spinning apparatus
US5916117A (en) * 1996-12-06 1999-06-29 W. Schlafhorst Ag & Co. Yarn guide for a pot spinning machine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR805131A (fr) * 1936-04-18 1936-11-12 Métier à filer la rayonne en employant une filière tournante
US2191583A (en) * 1937-08-11 1940-02-27 Pastor Carl Theodor Spinning device
US2313268A (en) * 1942-07-14 1943-03-09 Rubinstein Harry Making and treating rayon cakes
FR984386A (fr) * 1949-02-22 1951-07-05 Sajetfabrieken P Clos En Leemb Dispositif applicable aux machines centrifuges à filer ou à retordre
GB782614A (en) * 1954-10-13 1957-09-11 Carlos Pujol Spinning and winding device for textile fibres

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR805131A (fr) * 1936-04-18 1936-11-12 Métier à filer la rayonne en employant une filière tournante
US2191583A (en) * 1937-08-11 1940-02-27 Pastor Carl Theodor Spinning device
US2313268A (en) * 1942-07-14 1943-03-09 Rubinstein Harry Making and treating rayon cakes
FR984386A (fr) * 1949-02-22 1951-07-05 Sajetfabrieken P Clos En Leemb Dispositif applicable aux machines centrifuges à filer ou à retordre
GB782614A (en) * 1954-10-13 1957-09-11 Carlos Pujol Spinning and winding device for textile fibres

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4103771A1 (de) * 1991-02-08 1992-08-13 Schlafhorst & Co W Verfahren und einrichtung zum herstellen eines fadens nach dem zentrifugenspinnverfahren
US5289675A (en) * 1991-03-19 1994-03-01 W. Schlafhorst AgG & Co. Pot spinning assembly with movable pot
US5515672A (en) * 1993-07-17 1996-05-14 W. Schlafhorst Ag & Co. Transport system in a pot spinning machine
US5613355A (en) * 1994-07-29 1997-03-25 Schlafhorst Ag & Co. Method for rewinding a spinning cake in a pot spinning apparatus
US5916117A (en) * 1996-12-06 1999-06-29 W. Schlafhorst Ag & Co. Yarn guide for a pot spinning machine

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Publication number Publication date
BE641645A (en:Method) 1964-04-16
ES289690A1 (es) 1963-12-01
GB1041827A (en) 1966-09-07

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