US2607083A - Textile fiber drafting frame - Google Patents

Description

Aug. 19, 1952 w. F. BIRD 2,607,083

TEXTILE FIBER DRAFTING FRAME Filed Nov. 17, 1948 2 SI-IEETS-SHEET 1 INVENTOR: l'gfiworiizlfltmi, By @z a? m A TTORNEYS.

A 19, 1952 w. F. BIRD 2,607,083

7 TEXTILE FIBER DRAFTING FRAME Filed NOV. 17, 1948 2 SHEETS-SHEET 2 BY 42mm ATTORNEYS.

Patented Aug. 19, 1952 2,607,083 TEXTILE- FIBER DRAFT'ING FRAME A Whitworth ErBird', sw r hm re, P s assignorfiu Collins-8c Aikman Corporation, Philadelphia Pa.,,a. corporation of Delaware Applicaticn'November 17, 1948, Serial No. 60; 534

This mventionrelates. to textile fiberproclessin apparatus such as drafting 'jframeswhich may he used in forming rovinge'yarns and similar strands from fibers of wool, cotton, rayon, blends of the same either singly Lorin combination.

More particularly; it 'isdirected to a draftframe having the usual front drawing .ofi rollers, a'hor- :iznuntaillv adjustable driveniroll and a top roll centered forwardly of the said adjustable driven roll. The frame may and preferably does contain a nose bar positioned close behind the nip of the drawing oilrollsl An'apron mayor need not "be used and when used'p'asses over the "nose bar, the driven roll and :about a yieldingly mounted tensioning means. My improvements are useful,

however, in all cases where substantial vertical and horizontal .adjustment :of the top roll is .required so as to maintain a close relationship to the front rolls or the nose bar. It'is to be noted that in the illustrated embodiments, the bottom 5 driving .roll, by being made adjustable horizontally, admits of maintaining "bothclose positiom ing between the nose bar in all adjusted positions and considerable vertical adjustment; My improvements are highly desirable this environ 5 'ment.

'Diiliculty has been experienced in providing a convenient and accurate adjustment means for the top roll. The cap bar inclined slot arrangement as shown, for example, ,in Butler Patent .1

1,444,658 or Shaw 2,233,963, tends to obscure the vision of the operator, requires more parts and is inconvenient =ior making either a great number of adjustments-across the frame or iiustment of substantial-size.

Also a single plane surface guide operating in conjunction with an ordinary round or regular resorting to the use of securing screws and the like. This support cooperates with the top roll shaft to cause it to follow an arcuate or curved path and thus maintain 'a predetermined spaced relationship with the nose bar or front nip in any particular adj t d position of thetop roll. This accurate ad- 12; Claims. (01.19-131) result is conveniently accomplished by themevision oi an. interm di te s ppo t for the top roll shaft which support is eccen r to the bear-ins center of the shatter by curved supp r s i h without eccentrics as will be more fully explained.

As described in my prior- Uni ed ates Patent No. 2,471,057,, ranted May 24,. 1,94 he irames shown therein pr v de for adjustment f; a slip draft roll in botha hor zo tal and vertical direction. The vertical adiustm nt may; appr ximate from 1% to inchicra slip r llhavn i r closecontrol.

An object of my invention is to provide a nvement adjustment .icr the top roll. capa le of substantial vertical and horizontal adjustment into positions alon arcuate or curved path- .Anotherobiectis to provide air-adj s in mcans for a top roll of draft iramcsin-w cha ho iz tal adjustable drivin bottom r011 cooperates in several adjusted positions 'withzsaid top ra l. t drive thetoprollandlorzanran on. 7

Another object isto provide an adjust n means, for :a top roll of draft frames. inc udin an eccentric "which is conveniently a part oi the normal operating parts. 1

These and other objects of invention will be manifest from a consideration or the followi description, claims and drawings whi h;

Fig. :1 is an-elevational somewhat diagrammatic view of'my .draitirame showing an ecc ntrica-lly mounted-top roll shaft and "the usually fixed support;

Fig, 2 is .a detailed. "assembly showing the relation of parts and a "central supportin arran e- -ment for the-shaft.

Fig. .3. is a modification *in-wliich -theusually fixedisupport iscurved. r

:Fig. 4. is another modification :in whichthe eccentric is bodily pivotable to effect the severa adjustments. x

In Fig. 1 Ishowithe general arrangement of two iront drawing on rolls 1'0 and 1H whichform the usual front drawing 101T nip, and a pair of back feeding-rolls Hand ;I3;i Roll I3' is a stock supporting'feed roll. The use-of r011 12 is optional when the roll 19 isaratchformingroll. Positionedibetw'een th'epairsof rolls Sisa fiber control unit comprising a nose bar .l '4,.apron l5, and horizontally adjustable driving roller [6 having a shaft 11 journaled on frame I18. A top roll 19 which may be a solid, shell or slip roll with rigid collars 29 (see Fig. 2) forms an apron driving nip with the roller iii to drive the apron l5. A spring ill or other weighting means may be used to increase the apron nip pressure if its own weight is insufficient. A yieldable mounted apron tensioning roll 22 pivots about 23 on frame member (8a;

The pair of top rolls supported by a shaft 25. The shaft 25 is centrally supported, this being an old feature per se as illustrated by such patents as Stahlecker 2,246,474. I have found it highly desirable that the center of the top roll be positioned along an arcuate or curved path in its several adjusted positions in. order to maintain a proper spaced relationship between the top portion of the nose bar and the periphery of the top roll. To accomplish this I provide the shaft 25 with matched eccentrics 26. The eccentrics 28 are preferably integral with the shaft, but not necessarily so. The rolls, such as roll 21 in Fig. 2 having protective collars 2!! and slip draft portion 29 of pins or other material more fragile than the collars, turn freely on stationary shaft 25.

As will be seen from Fig. 1 the several facets 30 of polygon matched eccentrics 26 are differently spaced from the center of the shaft 25. The usually fixed support 32 is secured to the frame l8 as by bolt 33 and preferably has two inclined ledges to which the facets may be applied or slide on. It will be seen that adjustment of the frame may be accomplished as desired by positioning a pair of facets 30 on the support 32 so that the proper relationship between the nose bar and front rolls exists. The horizontally adjustable roller I6 is then moved up into apron nip forming position. By using the corresponding facets on the other side of the frame, the proper adjustment automatically results. It will be understood that my polygon may have 3, 4, or more sides and their spacingfrom the center is correlated with the inclination of the support 32.

Fig. 3 shows a modification in which there is provided a usually fixed support 40 having an arcuate surface 4i concentric or slightly eccentric to a point within and close to the tip of the nose bar. If the nose bar forms a quadrant or semicircle the centers may, but need not exactly coincide.

In this modification the shaft support block 42 has concave surfaces differently spaced from the center of the shaft 25'. The structure may result in less frequent or smaller changes of the facets than that of Fig. 1. When the curve generated by the center of the top roll is regular as in a section of a circle or ellipse this modification is quite convenient. A spring may, of course, be applied as shown in Fig. 1 and is omitted for clarity in Figs. 3 and 4 of the drawings. It will be understood that the short portions of the eccentric are not bearing portions, but merely connect the curves. More or less than 4 surfaces are contemplated.

Fig. 4 represents a third modification in which the eccentric member 50 may bodily pivot about a member 5i fixed to the frame IS. A number of pivot points 52 are spaced from the center of the shaft 25" when in operating position so as to provide about vertical changes over a adjustment range with a top roll approximately 1% inches in diameter. The pivot points may be identified according to the setting they will produce. As will be understood, the shape of the eccentric 50 will be to some extent controlled by the position of the shaft center, and may be either circular, elliptical or the like. Preferably the eccentric should be comparatively large so as to give effective leverage for weighting means such as spring 2| as shown in Fig. 1.

However, in frames using a nose bar the matter of space is important and sometimes it is necessary to keep the size of the eccentric such that it does not greatly extend beyond the outline of the top or that it be completely confined within this outline.

From a consideration of the above, it will be seen that I have provided built-in adjustment structures for top rolls having substantial vertical and horizontal adjustment. Vertical and horizontal as used herein are being used in the sense of transverse and longitudinally of the path of the stock. The frames are frequently inclined.

It will also be seen that the most desirable setting may be obtained for the stock as well as for machine relationships. The shaft for the top roll need not rotate and the eccentrics are optionally separate or integral with the shaft 25. The eccentric and shaft proper is somewhat referred to herein as an eccentrically mounted shaft assembly and the curved path recited in the claims is intended to include irregular or smooth curves. A straight line adjustment for the adjusting range is notincluded nor is it adequate for my purposes.

In all the figures, the basic parts have been given the same numerals in the interest of brevity and the parts are functionally shown for simplicity. It will be noted, however, that the nose bars, I 4, M and [4" may vary somewhat in design. The eccentric supports are in all cases positioned laterally of the apron. This may be centrally of a pair of top rolls as in Fig. 2 or outside the rolls as will be understood.

Having described my invention in separate embodiments, but wishing to be limited only by the scope of the following, I claim:

I i. In a drafting device for textile fibers a pair of front drawing off members, strand feeding means including a pair of back feed rolls, a horizontally adjustable bottom driving roll, a top roll centered forwardly of said bottom roll and in operative engagement therewith, a supporting shaft for the top roll, means for adjusting the horizontal and vertical position of said top roll relative to said front drawing off members in a plurality of positions along a curved path whereby the end of the supporting shaft defines a curved path in a vertical plane according to its adjustment movement, said adjusting means including a support mounted in a fixed position independent of the various adjustment positions of the horizontally adjustable bottom roll and positioned below the top roll shaft in supporting relationship thereto, said support having a surface disposed at an angle to the direction of adjustment of the bottom roll for supporting said top roll shaft.

2. The drafting device of claim 1 further characterized by the fact that the top roll shaft supports a pair of top rolls and that the shaft support is centrally positioned relative to said pair.

3. In a drafting device for textile fibers a pair of front drawing off members, strand supporting means including a pair of back feed rolls, intermediate fiber control means, a horizontally adjustable bottom driving roll, a nose bar, a top roll centered forwardly of said bottom roll and posi tioned in operative engagement therewith, a supporting shaft for the top roll, means for adjusting the horizontal and vertical position of said top roll relative to said nose bar in a plurality of positions along a curved path whereby the end of the supporting shaft defines a curved path in a vertical plane in accordance with its adjusted movement, said adjusting means including a support mounted in a fixed position independent of the various adjustment positions of the horizontally adjustable bottom roll and positioned below the top roll in supporting relationship thereto and having a surface disposed at an angle to the direction of adjustment of the bottom roll for supporting said top roll shaft.

4. The drafting device of claim 3 further characterized by an eccentric attached to the top roll shaft, said eccentric having a plurality of surfaces adapted to selectively engage the said surface of the fixed support,

5. The drafting device of claim 4 further characterized by weighting means operatively connected to said top roll shaft.

6. The drafting device of claim 4 further characterized by the fact that the fixed support has a surface slide and that the eccentric has three or more sides difierently spaced from the center of the top roll shaft any one of which sides may contact said surface slide.

'7. The drafting device of claim 3 further characterized by a weighting means operatively connected to the top roll shaft. 7

8. The drafting device of claim 3 further characterized by the fact that the top roll shaft supports a pair of top rolls and that said shaft is centrally positioned with respect to said pair.

9. In a drafting device for textile fibers, a pair of front drawing oif members, strand feeding means includin a pair of back feeding rolls and an endless looped apron having a strand support portion, supporting means for the apron including a nose bar close behind the front drawing 011 members, an apron tensioning roll yieldingly positioned within the apron loop, a horizontally adjustable bottom driving roll mounted within the loop of said apron, a top roll centered forwardly of said bottom roll and positioned above said apron in nip forming relation with said apron and said bottom roll, a supportingshaft' position independent of the various adjustment positions of the bottom roll and an eccentric attached to the top roll shaft, said eccentric having a plurality of operative surfaces adapted to selectively engage the fixed support.

10. In a drafting devicefor textile fibers, a pair of front drawing off members, strand feeding means including a pair of back feeding rolls and an endless looped apron having a strand supporting portion, supporting means for the apron including a nose bar close behind the front drawing off members, an apron tensioning roll yieldingly'positioned within the apron loop, a horizontally adjustable bottom driving roll mounted within the loop of said apron, a top roll centered forwardly of said bottom roll and positioned above said apron in nip forming relation with said apron and said bottom roll, a supporting shaft for the top roll, means for adjusting the horizontal and vertical position of said top roll supporting shaft relative to said nose bar in a plurality of positions above said apron along a curved path whereby the end of the supporting shaft defines a curved path in a vertical plane according to its adjustment movement, said adjusting means including an arcuate support mounted in a fixed position independent of the various adjustment positions of the bottom roll and means integral with the top roll shaft adapted to slide over the arcuate support.

11. The drafting device of claim 10 further characterized by the fact that the top rollijshaft supports a pair of rolls and that the arcuate support is centrally positioned relative to said pair. 12 The drafting device of claim 10 further characterized by the fact that the means intesgral with the top roll shaft is concave.

WHITWORTH F. BIVIRD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS I Number Name Date 1,444,658 Butler Feb.6 1923 1,554,987 Butler Sept. 29, 1925 1,586,605 Butler June 1, 1926 1,697,737 Simon Jan. 1, 1929 2,233,963 Shaw Mar. 4, 1941 FOREIGN PATENTS I, I Number Country Date 336,986 Great Britain Oct. 17, 1930

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