US2175107A - Mechanism for drawing textile rovings - Google Patents

Mechanism for drawing textile rovings Download PDF

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Publication number
US2175107A
US2175107A US203415A US20341538A US2175107A US 2175107 A US2175107 A US 2175107A US 203415 A US203415 A US 203415A US 20341538 A US20341538 A US 20341538A US 2175107 A US2175107 A US 2175107A
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United States
Prior art keywords
belts
belt
rollers
roving
nip
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Expired - Lifetime
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US203415A
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English (en)
Inventor
Casablancas Fernando
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Casablancas High Draft Co Ltd
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Casablancas High Draft Co Ltd
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/26—Drafting machines or arrangements without fallers or like pinned bars in which fibres are controlled by one or more endless aprons

Definitions

  • This invention relates to mechanisms for drawing textile rovings or slivers and more particularly to high draft mechanisms making use of one or more endless belts, and one of its chief objects is to overcome certain objections and limitations which are inherent in mechanisms of this type as at present known and used.
  • Figure 1 illustrates diagrammatically and in section a typical two-belt arrangement of the known and widely used mechanism of the socalled Casablancas system
  • Figures 2 and 3 are similar views showing this known mechanism in faulty operation
  • Figure 4 shows diagrammatically and in section an improved mechanism in accordance with the present invention
  • l Figures 5 to 10 show various modifications according to the invention.
  • the delivery nip N at the front part of the belts I and 2 is set nearer the nip of the drawing rollers 3 and 4 than is possible with a pair of rollers of a practical diameter.
  • the fibre-carrying belts are positively driven by means of a pair of rollers 5 and 6, the nip between which is set at a distance from the nip of the front drawing rollers 3 and 4 sufficiently great for the spinning of the longest cotton fibres.
  • the standard belt arrangement illustrated in Figure 1 may be said to comply with each one of the three points (a), (b) and (c) as much as is possible with this type of mechanism.
  • the closeness of the nip N to the rollers 3 and 4, the softness of the belts, and the separation of the rollers 5 and 6 from the rollers 3 and 4 are factors restricted to certain definite limits ⁇ beyond which the arrangement would begin to work in a very unsatisfactory manner. Therefore the scope and the efficiency of present belt mechanisms is directly dependent on the degree to which the three conditions (a), (b) and (c) can be achieved.
  • the two endless belts l and 2 are set almost touching the front rollers 3 and 4 as shown in Figure 1, the distance between the nip N and the 3 drawing nip of the rollers 3 and 4 being, therefore, the minimum possible with this present arrangement.
  • a nearer nip N could be obtained if the two belts were forced to bend more sharply round the arms of the tensor 1, 8 but, with belts I'10 of the usual thickness and rigidity, this would result in excessive friction against the arms of the tensor and also in excessive tightness on the bres within the nip N.
  • Thinner or otherwise softer belts would give a satisfactory nearer nip 15 N, but these cannot be used because, in practice, they would not work properly over the space between the rollers 5 and 6 and up to the nip N, that is, over the portion which is utilised for the control of the fibres. Owing to the fact that the 20 middle parts of the belts are being pushed along from the rollers 5 and 6 towards the front nip N, they will only travel straight along the desired path if each belt is sufficiently rigid and the opening between the two arms of the tensor 1, 8 is 25 I sufficiently wide.
  • the length of belt comprised between the rollers 5 and 6 and the nip N must also be sufliciently small. If this is too great, the belts too thin or soft, or the opening of the tensor too narrow, the belts will be deformed out of their straight paths in, for example, the manner shown in Figure 2 or Figure 3.
  • the distance between the delivery nip of the belts and the drawing nip of the front rollers can be smaller than heretofore.
  • the rollers carrying the belts can be set at a greater distance from the drawing rollers.
  • Figure 4 shows one such mechanism provided with endless belts in accordance with the invention.
  • the two rollers 5 and 6 each carry four and I3 and 20, 2
  • the, pair I and 20 are the only two acting on the fibres; each other additional belt is smaller than the preceding one and acts over its inner surface as a steadying and Without the collaboration of the inner belts II, I2 and I3 and 2
  • the pressure between the two working surfaces of the belts would be at its maximum under the rollers 5 and 6 but would soon decrease to nil or almost nil along most of the distance and again near the nip N.
  • thermore the pressure or grip on the libres at N is maintained practically constant over the full distance between the rollers 5 and 6 and the nip N. It may also be so arranged that the dl pressure decreases gradually and uniformly from a maximum between the rollers 5 and 6 to a minimum at N, the desired result being obtainable in diierent ways such as by the use of inner belts of varying thickness or rigidity.
  • Figure 7 represents a belt arrangement with no tensors and using instead two outside plates I8 and 2l which squeeze the belts into a very acute front nip N.
  • This particular example again clearly illustrates the part played by the inner belts II, I2 and 2
  • Figure 8 shows an arrangement with inner belts mounted inside only one of the main belts.
  • the inner belt II in the illustration presses the outer belt I0 against the bottom belt 20 and, although owing to the slack of this bottom belt the path of the roving is deflected as shown, the contact between the working surfaces of the top and bottom belts is kept rm and steady owing to the resilient action of the inner belt.
  • a fixed member I6 is shown bearing against the upper side of the belt II.
  • bottom belt 20 is held cal means such tensioning lever taut by suitable mechanias, for instance, a small pivoted 3U and weight 3l, so that the top main belt III which is provided with two inner belts II and I2 is held in contact along a substantially straight path.
  • suitable mechanias for instance, a small pivoted 3U and weight 3l
  • the application of the inner the ways described can also be carried out in the case of drawing arrangements, with only one acting belt and a stationary plate, or with one belt and one roller, or with one belt and a plate and a roller.
  • TheI single acting belt can then be provided with one or more assisting belts inside it.
  • Figure 10 shows a drawing mechanism having a fixed plate 32 and additional roller 33 which cooperate with the belt I II to guide and control the roving. Additional belts II and I2 are provided within the belt III.
  • the inner belt or belts may be narrower than the outer belts acting on the roving, and two or more narrow inner belts of the same length may be used side by side in lieu of a single wider belt.
  • the roller or rollers carrying the belts may have suitable recesses or grooves for the inner belts to fit in, so that they do not project above the surfaces of the rollers.
  • a mechanism for drawing textile roving the combination of a roller, at least two endless belts one within the other passing round the said roller and extending therefrom in the form of loops, a tensor member within the loop of the outermost of the said belts, means co-operating with one side ofthe loop of the said outermost belt to guide and control the roving being drawn, means engaging at least one of the inner belts within the loop thereof for modifying the pressure between the outermost belt and the co-operating means, and means for drawing the roving from between the said outermost belt and the said cooperating means.
  • a mechanism for drawing textile roving the combination of a roller, at least two endless belts one within the other passing round the said roller and extending therefrom in the form of loops, a tensor member within the loop of the outermost of the said belts, means co-operating with one side of the loop of the said outermost belt to guide and control the roving being drawn, means engaging the outer surface of the loop part of at least one of the inner belts for increasing the pressure between the outermost belt and the cooperating means, and means for drawing the roving from between the said outermost belt and the said co-operating means.
  • a roller an endless belt passing round said roller and forming a loop extending therefrom, means cooperating with the said belt to engage and guide the roving being drawn, at least one additional endless belt within the rst mentioned endless belt and passing round said roller, said additional endless belt being adapted to support and guide said first mentioned belt, and means for drawing the roving from between said first mentioned belt and said cooperating means.
  • a pair oi' rollers at least two endless belts, one within the other passing round each of the said rollers, each inner endless belt being adapted to support and guide its outer belt and each belt forming a loop extending from its roller, the outermost belt of one roller being adapted to engage the outermost belt of the other roller and in cooperation therewith to guide and control the roving being drawn, a pair of front rollers for drawing the roving from between the belts, and tensor means within the loop of each of the said outermost belts, said tensor means being so located relatively to the front rollers that the front nip of the said belts is closely adjacent the nip of said front rollers.
  • a mechanism for drawing textile rovings the combination of a pair of rollers, an endless belt passing round each of said rollers, each belt forming a loop extending from its roller and adapted to engage the loop of the belt of the other roller and in cooperation therewith to guide and control the roving being drawn, tensor means within each of said loops, at least'one additional endless belt within at least one of the first mentioned belts and passing round the roller thereof, said additional endless belt being adapted to support and guide said first mentioned belt, means engaging at least one inner belt to modify the pressure of its outer belt on the roving, and means for drawing the roving from the belts.
  • a mechanism for drawing textile rovings the combination of a pair of rollers, an endless belt passing round each of said rollers, each belt forming a loop extending from its roller and adapted to engage the loop of the belt of the other roller and in cooperation therewith to guide and control the roving being drawn, tensor means within each oi said loops, a plurality of additional endless belts within each of the iirst mentioned belts and passing round the rollers thereof, said additional endless belts being adapted to support and guide said iirst mentioned belts, a plurality of members, one cooperating with each o! the said additional inner belts to modify the pressure of said first mentioned outer belts on the roving, and means for drawing the roving from between the belts.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US203415A 1937-12-06 1938-04-21 Mechanism for drawing textile rovings Expired - Lifetime US2175107A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2175107X 1937-12-06

Publications (1)

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US2175107A true US2175107A (en) 1939-10-03

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US203415A Expired - Lifetime US2175107A (en) 1937-12-06 1938-04-21 Mechanism for drawing textile rovings

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US (1) US2175107A (es)
FR (1) FR841939A (es)
GB (1) GB493180A (es)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2686938A (en) * 1949-02-02 1954-08-24 Noguera
US3636591A (en) * 1968-11-28 1972-01-25 Schlumberger Cie N Drafting device for textile machines
WO2014018645A1 (en) 2012-07-25 2014-01-30 R. J. Reynolds Tobacco Company Mixed fiber sliver for use in the manufacture of cigarette filter elements
US10524500B2 (en) 2016-06-10 2020-01-07 R.J. Reynolds Tobacco Company Staple fiber blend for use in the manufacture of cigarette filter elements

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2686938A (en) * 1949-02-02 1954-08-24 Noguera
US3636591A (en) * 1968-11-28 1972-01-25 Schlumberger Cie N Drafting device for textile machines
WO2014018645A1 (en) 2012-07-25 2014-01-30 R. J. Reynolds Tobacco Company Mixed fiber sliver for use in the manufacture of cigarette filter elements
US9179709B2 (en) 2012-07-25 2015-11-10 R. J. Reynolds Tobacco Company Mixed fiber sliver for use in the manufacture of cigarette filter elements
US9833017B2 (en) 2012-07-25 2017-12-05 R.J. Reynolds Tobacco Company Mixed fiber sliver for use in the manufacture of cigarette filter elements
US10524500B2 (en) 2016-06-10 2020-01-07 R.J. Reynolds Tobacco Company Staple fiber blend for use in the manufacture of cigarette filter elements

Also Published As

Publication number Publication date
GB493180A (es)
FR841939A (es)

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