US2756462A - Drafting mechanism - Google Patents

Drafting mechanism Download PDF

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Publication number
US2756462A
US2756462A US319272A US31927252A US2756462A US 2756462 A US2756462 A US 2756462A US 319272 A US319272 A US 319272A US 31927252 A US31927252 A US 31927252A US 2756462 A US2756462 A US 2756462A
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US
United States
Prior art keywords
apron
roll
rolls
bar
supporting
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
US319272A
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English (en)
Inventor
George D Love
David B Hopkinson
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
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
Priority to GB740946D priority Critical patent/GB740946A/en
Application filed by Saco Lowell Shops filed Critical Saco Lowell Shops
Priority to US319272A priority patent/US2756462A/en
Application granted granted Critical
Publication of US2756462A publication Critical patent/US2756462A/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 textile fiber drafting mechanisms for spinning and roving frames and pertains more specifically to a textile drafting mechanism capable of drafting fibers of widely varying lengths and characteristics, particularly extremely long fibers as Well as mixtures of fibers of such widely varying lengths and characteristics.
  • a drafting apparatus of the apron type having between a pair of delivery rolls and a pair of back rolls a fiber control mechanism comprising an overlying roll cooperating with an endless apron to control the fibers, the endless apron generally having an apron driving roll and an apron bar as well as a suitable tensioning roll within its loop, and with the overlying roll run ning in a depressed curve of the apron and providing a control zone having a soft yielding grip on the sliver being drafted.
  • the overlying apron roll By varying the mounting and/or weighting on the overlying apron roll, it is possible to employ such an apparatus either as a single zone drafting mechanism, in which the main draft occurs between the back rolls and the delivery rolls with a slip draft between the apron and its overlying roll, or to use it as a two-zone drafting mechanism with the fibers being firmly nipped between the apron and the overlying roll.
  • the control of the fibers being drafted depends largely upon the extent of the arc of contact between the apron and the overlying roll forward of the apron driving roll. In order to provide a sufficiently long are of contact, it has been necessary to set the apron bar rather close to the apron driving roll.
  • Another object is to provide a drafting mechanism having spaced delivery rolls and holding rolls provided with a fiber control mechanism of the apron type, either a single zone drafting device or a two-zone drafting device, which provides continuous support for the fibers from the fiber control mechanism to a point adjacent the nip of the delivery rolls regardless of fiber length.
  • Another object is to provide a drafting mechanism in which the fiber control mechanism is adjustable to and from the delivery rolls without separation of the apron from the delivery rolls and without loss of control over short fibers.
  • Another object is to provide a mechanism of the type described having two apron bars which are readily removable so as to convert the device, if desired, from a long fiber to a short fiber drafting mechanism.
  • Fig. l is a vertical section of a drafting mechanism embodying the present invention.
  • Fig. 2 is a detailed vertical section of one portion of the device showing a second embodiment of the invennon.
  • the device includes a pair of delivery rolls 8 and 9 at its forward end, an intermediate pair 10 and 11, and a back pair 12 and 13 at its rearward end.
  • Lower rolls 9, 11 and 13 extend for substantially the entire length of the machine and are driven by conventional gearing (not shown) located at the end of the spinning or roving frame.
  • Lower roll 9 is mounted in bearing block 14 secured toroll stand 15 while lower holding roll 13 is mounted in hearing block 16 adjustably secured to a track 17 in the upper face of roll stand 15 by means of bolt and nut 18.
  • Upper rolls 8 and 12 are mounted in guide members 20 and 21 adjustably secured on cap bar 22.
  • Trumpet 23 mounted on bar 24 serves to guide and feed the sliver between holding rolls 12 and 13.
  • the fiber control mechanism mounted between the holding and delivery rolls includes positively driven apron driving roll 11 and apron bar 26 mounted in slots on hearing block 27, which is adjustably secured to the track of the roll stand by means of bolt and nut 28 so as to be movable to and from delivery rolls 8 and 9.
  • An auxiliary apron bar 29 is mounted on hearing block cap 19 on hearing block 14.
  • Apron 30 passes about apron driving roll 11, apron bar 26 and auxiliary apron bar 29, being held under tension by apron tensioning roll 31 engaged by arms 32 pivoted on rod 33.
  • apron roll 10 contacts the outer face of apron 30 between apron driving roll 11 and apron bar 26, this roll being supported by the outer race 35 of its anti-friction bearing resting on seat 36 of cap bar fitting 37. Accordingly roll 10 thus supported is free to move only along seat 36 to and from apron driving roll 11 so as to nip apron 3i and the sliver between the two rolls.
  • Control roll 4%) is mounted in slots 41 in guide member 42 adjustably secured to cap bar 22 disposed above auxiliary apron bar 29.
  • Control roll 4%) is urged against the top face of apron 3b as it passes over auxiliary apron bar 29 solely by its own weight, being free to slide in slot 41, so that slippage of the fibers occurs between the roll and the apron.
  • a suitable weighting arrangement for the top rolls is shown, similar to that of Rabasa U. S. Patent No. 2,381,856, in which a cartridge 45 containing a compression coil spring is mounted on main frame 46 so as to urge pusher rod 47 upwardly against lever arm 48.
  • Lever 48 is pivoted at 49 on a pivot support 50, which is threaded at its lower end and adjustably secured to frame 46 by nuts.51 51.
  • a lugSZat the opposite end of lever 48 is engaged by connectingmember-SZ whichyin turn i pivoted to floating lever 54.
  • Weight hooks 55 and 56 are in turn pivoted at opposite ends of lever 54, hook 55 resting on the arbor of top delivery roll 8 and hook 56 resting on saddle 57 which in turn bearsupon the arbors of top rolls and 12.
  • auxiliary apron bar 29 is separately mounted on bearing block 69, which is adjustably secured on track 17 of the roll stand by means of nut and bolt 61.
  • the auxiliary apron bar may readily be adjusted toand from the nip of delivery rolls 8 and 9 or may be completely removed from the device without the necessity for dis turbing the mounting of thedelivcry rolls.
  • control roll 49 bearing on apron 3% as it passes over auxiliary apron bar 29 is optional, being unnecessary in the case of certain fibers but being desirable in the case of others having different surface characteristics.
  • the rolls employed may be of any conventional con struction.
  • Bottom rolls 9, 11 and 13 are of suitably fluted or roughened steel so as to grip and hold securely the fibers of the sliver or the inner face of the apron, as the case may be.
  • Top rolls 8, 10 and 12 are suitably provided with resilient bosses or covers made of cork, leather, synthetic rubber, or the like.
  • Control roll 40 is suitably a steel roll; in the case of many fibers it is beneficial to use a heavy roll at this point, the weight being just less than enough to cause cockling of the fibers.
  • Apron 30 may be made of any suitable natural or synthetic material, leather being commonlyemployed. Roll speeds will vary depending upon the draft desired, as pointed out in some detail in Shaw U. S. Patent No.
  • top roll 19 and apron 30 single-zone drafting
  • top roll 10 is weighted so .as to grip the fibers firmly (two-zone drafting)
  • back rolls 12 and '13 function as holding rolls.
  • middle rolls 1i) and 11 should be spaced from delivery rolls 8 and 9 and from back rolls 12 and 13 a distance greater than the average fiber length of the sliver.
  • supplemental control roll 40 overlying auxiliary apron bar 29 provides an additional means for/ controlling the fibers between top roll 10 and the nip of the delivery rolls.
  • This arrangement makes it possible to control long fibers during drafting by holding only the tail ends of the fibers between top roll 10 and apron 31' (as is particularly desirable in the case of long staple nylon fibers) while at the same time supporting the fibers, which would otherwise be limp, in the space between top roll 10 and the nip of delivery rolls 8 and 9.
  • this-arrangement makes it possible to provide adequate control of blends containing a mixture of short'fibers with suchlong fibers while at the same time providing for taihend ,control of the long fibers.
  • a drafting mechanism the combination of a first pair of upper and lower rolls arranged to grip and draw a sliver therebetween, a second pair of upper and lower rolls behind the first pair between which the sliver is fed on its way to the first pair of rolls, an endless apronzrunning over the lower roll of said second pair of rolls, a first apron-supporting bar disposed between said lower rolls beneath said apron, said upper roll of said second pair of rolls bearing upon said apron and depressingit between said bar and said lowerroll of said second pair of rolls, supporting means for directly supporting said first apron bar for adjustable movement toward and away from the first pair of rolls and a second apron-supporting bar disposed beneath said apron adjacent the nip of the first said pair of rolls, the second pair of rolls and the first apronesnpporting bar being supported independently ofand adjustable toward and away from the first pair of rolls independently of the second apron-supportingibar.
  • a drafting mechanism of the character described comprising a pair of delivery rolls at the forwardend and a pair of holding rolls atits oposite end, .means sup.-
  • control mechanism including an endless looped underlying sliversupporting apron, a positively driven apron-supporting r011 within the "loop of and in contact with saidapron for supporting and driving said apron, supporting means for said apron supporting roll directly supportingsaid.
  • apron supporting roll for adjustable movement toward and away from said delivery rolls a first apron bar mounted on said supporting means and disposed forwardly of said supporting roll within the loop of said apron and in contact therewith, an upper roll overlying said.
  • apron outside the loop thereof between the apron supporting roll and the apron bar, and a second apron bar disposed forwardly of the first said bar adjacent nip of the delivery rolls within the loop of the apron, said apron-supporting roll, upper roll, and first apron bar being movably adjustable toward and away from thedelivery rolls independently of said second apron bar.
  • a drafting mechanism of thecharacter described comprising a pair of delivery rolls at the forward endand a pair of holding rolls at its opposite end, means support ing said rolls to act simultaneously on portions of a sliver spaced apart by a distance greater than the average fiber length of thesliver to feed and draft it, .means for re volving said rolls, and a rotary fiber control mechanism mounted between said pairs of rolls, said .controlmechanism including an endless looped underlying sliver-sup porting apron, a positively driven apron support-ing roll within the loop of and in contact with said apron for sup- P n n ng said apron, upp rtingrncanstm aid apron supporting roll directly supporting said porting roll for adjustable movement toward and away from said delivery rolls a first apron bar mounted on said supporting means and disposed forwardly of said supporting roll within the loop of said apron and in con tact therewith, an upper roll overlying-s
  • a drafting mechanism 'of thecharacter described comprising a pair of delivery rolls at the forward end and a pair of holding rolls at its opposite end, each of said pairs of rolls comprising atop roll and a bottom roll, means supporting said rolls to act simultaneously on portions of a sliver spaced apart by a distance greater than the average fiber length of the sliver to feed and draft it, means for revolving said rolls, and a rotary fiber control mechanism mounted between said pairs of rolls, said control mechanism including an endless looped underlying sliver-supporting apron, a positively driven apron-supporting roll within the loop of and in contact with said apron for supporting and driving said apron, supporting means for said apron supporting roll directly supporting said apron supporting roll for adjustable movement toward and away from said delivery rolls a first apron bar mounted on said supporting means and disposed forwardly of said supporting roll within the loop of said apron and in contact therewith, an upper roll overlying said apron outside the
  • a drafting mechanism of the character described comprising a pair of delivery rolls at the forward end and a pair of holding rolls at its opposite end, each of said pairs of rolls comprising a top roll and a bottom roll, means supporting said rolls to act simultaneously on portions of a sliver spaced apart by a distance greater than the average fiber length of the sliver to feed and draft it, means for revolving said rolls, and a rotary fiber control mechanism mounted between said pairs of rolls, said control mechanism including an endless looped underlying sliver-supporting apron, a positively driven apronsupporting roll within the loop of and in contact with said apron for supporting and driving said apron, supporting means for said apron supporting roll directly supporting said apron supporting roll for adjustable movement toward and away from said delivery rolls a first apron bar mounted on said supporting means and disposed forwardly of said supporting roll within the loop of said apron and in contact therewith, an upper roll overlying said apron outside the loop thereof between

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US319272A 1952-11-07 1952-11-07 Drafting mechanism Expired - Lifetime US2756462A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB740946D GB740946A (enrdf_load_stackoverflow) 1952-11-07
US319272A US2756462A (en) 1952-11-07 1952-11-07 Drafting mechanism

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US2756462A true US2756462A (en) 1956-07-31

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2955330A (en) * 1956-06-25 1960-10-11 Skf Kugellagerfabriken Gmbh Double-apron drafting mechanism
DE1122885B (de) * 1958-12-05 1962-01-25 Rieter Joh Jacob & Cie Ag Unterriemchenstreckwerk fuer Spinnmaschinen
US8650718B2 (en) * 2009-03-31 2014-02-18 Ozdilek Ev Tekstil Sanayi Ve Ticaret Anonim Sirketi In yarn production, apron cladding mechanism and method to the rollers coated with elastic material and found in the drafting and guiding zone, having shift structure and pre-tensioning mechanism

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2233963A (en) * 1938-06-13 1941-03-04 Saco Lowell Shops Drawing mechanism for textile fibers
DE712800C (de) * 1936-12-09 1941-10-25 Hermann Kluftinger Dipl Ing Riemchenstreckwerk
US2426425A (en) * 1944-08-08 1947-08-26 Saco Lowell Shops Long staple drafting mechanism

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE712800C (de) * 1936-12-09 1941-10-25 Hermann Kluftinger Dipl Ing Riemchenstreckwerk
US2233963A (en) * 1938-06-13 1941-03-04 Saco Lowell Shops Drawing mechanism for textile fibers
US2426425A (en) * 1944-08-08 1947-08-26 Saco Lowell Shops Long staple drafting mechanism

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2955330A (en) * 1956-06-25 1960-10-11 Skf Kugellagerfabriken Gmbh Double-apron drafting mechanism
DE1122885B (de) * 1958-12-05 1962-01-25 Rieter Joh Jacob & Cie Ag Unterriemchenstreckwerk fuer Spinnmaschinen
US3055060A (en) * 1958-12-05 1962-09-25 Rieter Joh Jacob & Cie Ag Drafting arrangement for spinning machines
US8650718B2 (en) * 2009-03-31 2014-02-18 Ozdilek Ev Tekstil Sanayi Ve Ticaret Anonim Sirketi In yarn production, apron cladding mechanism and method to the rollers coated with elastic material and found in the drafting and guiding zone, having shift structure and pre-tensioning mechanism

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