US2233963A - Drawing mechanism for textile fibers - Google Patents

Drawing mechanism for textile fibers Download PDF

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Publication number
US2233963A
US2233963A US213368A US21336838A US2233963A US 2233963 A US2233963 A US 2233963A US 213368 A US213368 A US 213368A US 21336838 A US21336838 A US 21336838A US 2233963 A US2233963 A US 2233963A
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United States
Prior art keywords
rolls
roll
belt
sliver
fibers
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Expired - Lifetime
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US213368A
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English (en)
Inventor
Benjamin C Shaw
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.)
Saco Lowell Shops
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Saco Lowell Shops
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Filing date
Publication date
Priority to GB524666D priority Critical patent/GB524666A/en
Application filed by Saco Lowell Shops filed Critical Saco Lowell Shops
Priority to US213368A priority patent/US2233963A/en
Priority to DES852D priority patent/DE922997C/de
Application granted granted Critical
Publication of US2233963A publication Critical patent/US2233963A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 drafting fibrous material at various stages in its preparation for'the operation of spinning as for example in the drawing mechanisms of roving and spinning frames.
  • a typical drawing mechanism used in a spinning frame comprises several pairs of drawing rolls, usually three or four, each pair including a lower and a cooperating upper roll, and the pairs being arranged, one in advance of the other, so that they act successfully on a continuous strand of sliver guided through them. .
  • each pair is revolved at a higher speed than the pair immediately preceding it so that during the travel of the sliver the fibers of which it is composed are drawn out, the sliver is attenuated, and the fibers are brought into a more nearly parallel relationship.
  • the present invention is especially concerned with this problem, and it aims to devise a drafting mechanism in which such a control as that above described will be maintained.
  • Fig, 2 is a similar View illustrating more es pecially the'weighting mechanism and its relationship to the drafting devices.
  • the mechanism there shown comprises three sets of drawing devices arranged to act successively on a sliver S.
  • these devices include a front pair of upper and lower drawing rolls 2 and 3, respectively, an intermediate pair 4 and 5, and a back pair 6 and I.
  • a trumpet 8 mounted on a traverse bar 9 guides the sliver between the rear rolls. These three pairs of rolls are operated at the speeds necessary to produce the desired drafting action on the sliver between the bites of successive pairs.
  • the peripheralspeed of the middle rolls is in the order of perhaps 1.10 to 1.25, for example, times that of the back rolls so as to impart to the strand a pre-tension or stretch sufficient to produce a slight slippage of the fibers relatively to each other. This sometimes is referred to as a "break draft, since it serves to free the fibers somewhat from the slight degree of twist which the sliver has when it comes to the spinning frame.
  • the present invention replaces the orthodox middle rolls with a unique set, of drafting elements.
  • These devices include rolls 4 and 5, a belt or apron l running between them, a guide l2 over which the belt runs after leaving the lower roll 5, and a pulley or idler l3 for applying the necessary tension to the belt.
  • This pulley has stub shafts projecting axially from opposite ends thereof, one of which is shown in Fig.
  • bottom rolls 3, 5 and I are all positively driven in the usual 5 manner by gearing located at one end of the frame, that these rolls are customarily made of steel and are fluted, or roughened to aflord a better grip on the sliver, or in the case of the middle roll, on the belt III, and that the upper rolls 2, 4 and 6 are driven by the lower rolls, as
  • Each of these upper rolls customarily consists of a metal body provided with gudgeons for running in guides in the cap bars and usually has a covering of cork, leather, or other yielding material.
  • belt III also may be made of the same materials as those used heretofore for similar belts and aprons, leather generally being used.
  • the upper rolls are weighted, as will later be described, to hold them in suitable driving relationship to the lower. rolls and to produce the necessary grip of the successive pairs of rolls on the sliver, and the weighting and guiding are, rangement for the upper middle roll 4 is such 5 that it presses this r011 toward its cooperating lower roll 5 along the line ab, Fig. 1, connecting the axes of the two rolls.
  • the arrangement is such that thebelt 10 has an ample arc of engagement with the lower roll 5 to enable it to 30 drive the belt. Also, this driving relationship is aided by the pressure of'the upper roll 4which thus cooperates with the lower roll to gripzthe belt firmly between them, in addition to improving the driving connection between the lower 5 roll and the upper roll.
  • the drawings show aitypical arrangement for cotton sliver ation'ini fiber length must be expected.
  • the nip of the front rolls should be spaced from the point d by a distance somewhat longer than the longest fiber. Since a maximum fiber length is about one and a quarterinches in stock of the character just mentioned, this means that the two nips will-be spaced apart by, say, one and a half inches.
  • the middle and front rolls are setas close together as practical so as to bring the point g as close to the nip of the front. rolls as possible. With rolls of ordinary sizes this may mean a distance of onehalf to five-eighths of an inch.
  • This zone of retarding influence may readily be made long enough to exert a similar control on all except theshortest fibers. Those which fail to bridge the gap between. the bite of the delivery rolls and the final nip of the belt I! and roll 4 will be carried forward by the majority of the fibers that are controlled in the manner above described. Consequently, while are not as well controlled as the longer ones, nevertheless the effect of the latter on the former is beneficial ,in controlling even these shorter fibers.
  • this arc of contact is somewhat over 60.
  • the pressure throughout the greater part of this area is such that the rearward ends of-the fibers may be withdrawn by the front rolls without breaking the fibers.
  • Fig. 2 shows the cap bar I! equipped with guides l9 and IQ of any suitable construction for the top rolls 2 and 6 and with a guide l8 for the top roll 4, the latter being provided with an in clined slot or guideway, as above described.
  • these guides are mounted for adjustment toward and from the front of the machine. Such an adjustment is important in producing the desired clearance at the point g, Fig. 1.
  • Fig. 2 also illustrates a special weighting mechanism adapted for this roll organization. It will be observedthat since the common center line of the two middle rolls is not parallel with the corresponding center lines of the front and back sets of rolls, some special provision must be made to apply pressure to the top rolls along the re spective center lines so that the entire benefit of the weighting devices will be obtained.
  • the weight I8 is suspended by a Weight hook 2'! from one end of a lever 2i, the opposite end of which is pivoted on the rigid but adjustable fulcrum piece 22.
  • a link 23 Connected to this lever by a link 23 is a weight distributing bar or floating lever 24 to one end of which the stirrup 25 for weighting the middle roll 4 is pivoted.
  • Another stirrup 26 is pivotally connected to the opposite end of the bar 24 and bears on a saddle 21, the opposite ends of which rest, respectively, on the gudgeons of the front roll 2 and the back roll 6. The distribution of weight between these two rolls is determined by the spacing of the bearing point 29 of the stirrup 26 on the saddle with reference to the rolls, considerably more pressure being applied to the front than to the back roll.
  • pivot 28 which connects the stirrup 2'5 with the end of the floating lever 24 is in the line a,-b passing through the axes of the two middle rolls 4 and 5 and that, consequently, the pull exerted on this pivot by its connections with the weight [8 is directly in the common center line of said rolls. This is desirable for the reasons above pointed out.
  • the weight applied by the saddle 21 to the front and rear rolls is exerted substantially in the common center lines of these respective sets of rolls.
  • the pivotal joint 30 between the stirrup 26 and the distributing bar 24 sllghtlyahead of a line through the bearing point 29 and parallel to the lines of pressure between the front and back sets of rolls so as to set up a component of force in the saddle 21 acting in the direction'of travel of the sliver with a tendency to hold the back roll 6 forward at all times against the front walls of its guideways where it is positioned properly with reference to its cooperating lower roll I.
  • the rearward end of the saddle 21 fits around the neck or gudgeon of the top roll.
  • the forward end of the saddle is provided with a flat surface to rest on the gudgeon of the top front roll 2.
  • the stirrup 26 may be made of resilient material, such as spring steel, of sumcient cross-sectional dimensions to accommodate all stresses imposed by weighting, while still capable of cushioning and equalizing the weighting forces against any factors disturbing the rotative movement of the rolls, so that inertia of the weight and the connecting linkage may not be affected by such factors, should they be present.
  • the stirrup 25 may likewise be made of a resilient material, but in practice it has been found that this is ordinarily not necessary since its linkage to the stirrup 26 through the equalizer bar tends to make the resiliency embodied in the latter stirrup effective for both lines of weight distribution.
  • the middle roll which is affected by and mutually affects the stirrup 25 rotates at a much lower speed than the front roll 2 and hence does not require such an instantaneous degree of interaction between itself and its weighting member.
  • the invention provides a drafting mechanism which maintains an exceptionally effective control of the fibers in the region where the main draft 'takes place, and in which such control is most needed and is most difficult to produce.
  • a mechanism for drafting cotton sliver and the like the combination of two sets of devices for gripping and feeding a sliver, said sets being arranged one in advance of the other to act successively on the sliver, the rear set of said devicescomprising a-belt and a top roll bearing on said belt, means for feeding said sliver into the bite of said top roll and said belt, means for supporting, driving, and guiding said belt comprising a guide adjacent to the front set of said devices and a lower driven roll behind it and ,over which'the belt runs, said guide and said means for so guiding said upper rear roll that it exerts its maximum pressure on said belt approximately in the plane connecting the axes of said upper and lower rear rolls.
  • a drawing mechanism including weighting mechanism acting on said rear upper roll in the direction of said plane passing approximately through the axes of the two rolls.
  • a mechanism for drafting cotton sliver and the like the combination of three pairs of upper and lower drafting rolls arranged in series to feed and draw a cotton sliver, a belt interposed between the middle rolls, means for guiding the top rolls for movement toward and from their respective bottom rolls along paths parallel tothe planes connecting the axes of therespective top and bottom rolls, said plane between the middle pair of said rolls extending at a substantial angle to the planes connecting the axes of the common to all of said rolls for pressing the top rolls against their cooperating bottom rolls in directions lying in said respective planes, said weighting mechanism including a distributing bar, a stirrup pivoted at its lower end to one end of said distributing bar, and having its upper end hooked onto the gudgeon of said top middle roll, a saddle straddling said top middle roll and having a flat forward end bearing on the gudgeon of said top front roll and a'grooved rear end embracing the gudgeon of the top rear roll, a resilient stirrup, the upper
  • a'mechanism for drafting uncombed cotton sliver the combination of a pair of upper and lower rolls arranged to grip and feed a sliver between them, a second pair of upper and lower rolls behind the first pair and between which said sliver is fed on its way to said front pair of rolls, a belt running over the lower of said rear rolls, a guide between said lower rolls over which said belt runs, said upper rear roll bearing on said belt between said guide and the lower rear roll and depressing the belt, the guide cooperating with said belt and rear rolls to cause the belt and said upper rear roll to grip the sliver between them from a releasing point closely-adjacent to the bite of the front rolls backwardly to a point somewhat beyond the rearward ends of the longest fibers simultaneously gripped by the front rolls, and means for so positioning said rolls and said guide with reference to each other that the rear ends of the longerand medium length fibers in the sliver will be yieldingly restrained between said belt and rear top roll while their forward ends
  • a mechanism for drafting uncombed cotton sliver the combination of a pair of upper and lower rolls arranged to grip and feed a sliver between them, a second pair of upper and lower rolls behind the first pair and between which said sliver is fed on its way to said front pair of rolls, a belt running over the lower of said rear rolls, a guide between said lower rolls, said guide having a rounded forward edge over which said belt runs, said upper rear roll bearing on said belt between said guide and the lower rear roll and depressing the belt, the guide cooperating with said belt and rear rolls to maintain the upper roll and belt in contact with opposite faces of the sliverfrom a position of firm bite at the lower side of said upper rear roll forwardly for a distance of atleast one half an inch and up to a releasing point within three-c arters of an inch of the bite of the front rolls, said belt leaving the upper rear roll and turning around said rounded front edge of said guide approximately at said releasing point.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US213368A 1938-06-13 1938-06-13 Drawing mechanism for textile fibers Expired - Lifetime US2233963A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB524666D GB524666A (de) 1938-06-13
US213368A US2233963A (en) 1938-06-13 1938-06-13 Drawing mechanism for textile fibers
DES852D DE922997C (de) 1938-06-13 1939-06-13 Unterriemchen-Streckwerk

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US922997XA 1938-06-13 1938-06-13
US213368A US2233963A (en) 1938-06-13 1938-06-13 Drawing mechanism for textile fibers

Publications (1)

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US2233963A true US2233963A (en) 1941-03-04

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DE (1) DE922997C (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2435157A (en) * 1945-08-29 1948-01-27 Pacific Mills Drawing mechanism for textile fibres
US2471057A (en) * 1945-12-18 1949-05-24 Collins & Aikman Corp Method and apparatus for drafting textile fibers
US2588420A (en) * 1948-08-18 1952-03-11 Saco Lowell Shops Textile drafting mechanism
US2607083A (en) * 1948-11-17 1952-08-19 Collins & Aikman Corp Textile fiber drafting frame
US2756462A (en) * 1952-11-07 1956-07-31 Saco Lowell Shops Drafting mechanism
DE960072C (de) * 1951-06-11 1957-03-14 Saco Lowell Shops Unterriemchen-Streckwerk fuer Spinn- und Vorspinnmaschinen

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1122885B (de) * 1958-12-05 1962-01-25 Rieter Joh Jacob & Cie Ag Unterriemchenstreckwerk fuer Spinnmaschinen

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE489510C (de) * 1930-01-17 Hannoversche Maschb Akt Ges Vo Brennstoffnadelventil mit austauschbarer Duesenplatte
DE556019C (de) * 1932-08-04 Filatura Di Tollegno Durchzugsstreckwerk
FR334278A (fr) * 1903-07-30 1903-12-17 Antoine Paillac Appareil étireur de mèches de préparation pour la filature
DE500050C (de) * 1928-04-03 1930-06-17 Arnold Aeberli Durchzugsstreckwerk fuer Spinnmaschinen und Strecken
FR742600A (de) * 1931-12-17 1933-03-10
DE662063C (de) * 1934-08-31 1938-07-04 Baumwollspinnerei Gronau Durchzugstreckwerk

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2435157A (en) * 1945-08-29 1948-01-27 Pacific Mills Drawing mechanism for textile fibres
US2471057A (en) * 1945-12-18 1949-05-24 Collins & Aikman Corp Method and apparatus for drafting textile fibers
US2588420A (en) * 1948-08-18 1952-03-11 Saco Lowell Shops Textile drafting mechanism
US2607083A (en) * 1948-11-17 1952-08-19 Collins & Aikman Corp Textile fiber drafting frame
DE960072C (de) * 1951-06-11 1957-03-14 Saco Lowell Shops Unterriemchen-Streckwerk fuer Spinn- und Vorspinnmaschinen
US2756462A (en) * 1952-11-07 1956-07-31 Saco Lowell Shops Drafting mechanism

Also Published As

Publication number Publication date
DE922997C (de) 1955-01-31

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