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Oct. 29, 1946. ` ’ 2,410,307 J. B. RUMsEY AAPPAM'I'US FOR CONVERTING TowÀ To TÓP Filed March 18, 19.45 -2 Sheets-Shee’rl l Ä BY _ , ' INVENTOIL‘ A - ATTÜRMEZ Ott. 29, 1946. J, B~ RUMSEY 2,410,307 I APPARATUS FOR CONVERTING TOW TO TOP ' Filed March 18, 1945 2 Sheets-Sheet 2 'X ‘m . ,-ï------------- --l-H-z I, i tb. ï. l | I' §\ _' i| l | E l _L ‘ i ' | l i | “L l ' l | I î- ' | l L g ggxl| 3. . ì| a . l . u.. ‘L s l l ì. | l . N5=§ wl; à: @ä i, lI Sì' *e 4l ¿_ l|I l lu I l ~ l ' l i ‘1_ | I l I | °§_ | ' x ‘I L_ L | _ *` _ „ _ _ _ _ _ _ _ _ „ „ „ ß _ _ _ _ _ _ __I INVENTOR. A TTORNEX Patented Oct. 29, 1946 2,410,307 YUNITED snrrssA PATENT OFFICE N Joseph Bt. Rumsey, Westwood, N. J., assignor to E; I. du; Pont de Nemours- &1Company, Wil mington, Del.,` a corporation of“> Delaware Application March 18, 1943,?~Serial No. 479,55l 3 Claims. (Cl.` 1`9f-1) 2 This invention relates to an apparatus for con verting a tow to a top without destroying the con . sliverl and >parallelism `of the fibers, are’main tained. tinuity of the‘towjand sliver and the substantial parallelism ofthe fibers. Herein the expression “tow” is intended to - , In.> general, the knives are arranged on the gill bars to effect a staggeredV cutting so that the ñbersï are in staggered relationship. Theknives may be arranged in a diagonal, broken diagonal, cover' a bundle of continuous iilaments in- sub stantially parallel relationship. Also, herein, the triangular, broken’ triangular, etc., pattern as'de‘ expression “sliver” is intended to cover the‘struc ture formed when the continuous iilaments of sire'd. The knives are also disposed at predeter mined positions in the selected pattern in accord. ance'with the length ofì fiber desired.- the tow are severed into> iibers> of predetermined lengths; Also, herein, the expression “top” is The drawing frame is preferably also provided with a condenser or trumpet of either the rotary or stationary type to receive the top from»- the Prior to thisî invention, a tow was passed through a drafting frame-wherein the speed of 15 drawing'rolls‘and direct said top- to a pair'of con densing rollsA The condensing'rolls compact and the` drafting rollers was'such asf to' haphazardly flatten the top> and'deliver it to a suitable recep break the ñlaments into relatively'short, irregular taclesuch as a ñberboard can, which is given-'an lengths to form a slivencontinuous‘ with the'tòw oscillatorymovement to permit packing of the top and without destroying the, substantial paralle‘b therein. Alternatively, the can may be> station» ism of the nbers. Y In this procedure, frequently 20 ary; and-the topëdeliver'ed thereto from the draft many of the continuous iilaments .were not lng frame i may be compressed by appropriate broken and it was impossible to convert'theñla means, such'as- an intermittently acting recipro ments into nbers of predetermined lengths. eating plunger.: Optionally, a guide, such as a An object of this invention is to provide an trough, may be provided intermediate the con apparatus for directly and continuously. convert 25 ,densingrolls and receiving receptacle. In some ing a tow to a topv formed of fibers' of predeter instances Ait may be desirable to dispense,A with mined lengths without destroying the. continuity the> receiving'can and to impart a- false twist to of the sliver'andztow and the'isubstantial.parallelr the top, for instance by a rotating trumpet, and ism of the fibers; A ’ " Y intended to cover the product resultingv from drawing the sliver.v Another object of this invention is to'provide an apparatus for directly.- and continuously; converti ing a tow to atop by cutting the- towpaco’ordingto a predetermined- pattern, to form' asliiver? ci’. ñb'e'rs of predetermined lengths and 'instaggïered rela tionship, without destroyingtl're‘ continuity' offt'he sliver and tow and the substantial‘parallelism of the fibers. ' - ' > ' In general, the objects of this invention. are ob» tained by providing knives, arranged according. to directly winditup as a ball warp. i ~In order‘tomore fully explain theî invention, reference will now be had to the'accompanying vdrawings*forming a part of this specification and v whereinanfillustrative embodiment of the inven 35 .tion is shown, and wherein :V Figure‘l, isa side elevation of a gill drafting frame (with the gill bar conveyer screws and driving mechanismsomitted for clarity) embody ing the features of this invention; Figure 2 is an enlarged top plan view of the a predetermined pattern, on the gill orY faller bars 40 _apparat-usshown in- Figure l, particularly show ,of a standard gill drafting frame 4so that when the ing thekni-ves arranged in a triangular pattern; tow is fed to the gill drafting frame (provided Figures 3, 4; and 5 are partial front elevations with the knife arrangement asïhereinbïeforemeni showing diiierent` means of securing the knives tioned) the knives `wilL‘in accordance with the pattern of' the arrangement of the~ knives; ,sever the iilamentsnthroughout the length- ofthe tow to produce a sliver‘composedf of nbersoi. prede termined lengths, without destroying the’conti' A’to the gill bars; - " Figure» 6« is aY partial perspective of another means of securing the knives to the gill bars; and Figure '7 is a diagrammatic arrangement oiïth'e bars. , rIïhough. the» invention. is not. restricted to any Inuit'y'of theV tow andthe sliver andthe substan tial parallelism of the fibers. Simultaneously 50 _specific tow,` for convenience it will be described in-> connection with rayon to . f with thev cutting ofthe filaments into fiber-sof Referring now -to` the drawings; whereinlike predetermined lengths, the sliver isu drafted (elongated or drawnldown `to a, predetermined size in` »which> the » substantial. continuity, ~ofljthe reference numeralsdesignate likeparts, »the ref-- erence` numeral 2 designates a»Y plurality of»- ends o? rayonltow suppliedY from> any suitable source 2,410,307 4 , to produce the desired results. »Since the distance 1 (not shown) and which pass through a converg ing guide 4 in their passage to the gill drafting frame. The gill drafting frame comprises the usual retaining rolls which, in the form shown, between the correspondingly positioned knives _ determines the length of the staple, it is clear that any length staple may be obtained. Likewise, any degree of staggering can be obtained. comprise a driven roll 5 and a heavy or weighted Though in Figure 2 the knives are shown as iloating roll 6 cooperating therewith. The draw ing rolls comprise a driven roll 'I and a heavy or arranged in a pattern of a triangle and will pro duce staple of 4substantially uniformv lengths ar weighted floating roll v8 cooperating therewith. ranged in staggered (triangular) relationship, the The drawing rolls> 'I and 8 are driven so that the invention is not restricted to such a precise pat tern. In Figure 7, the knives are arranged in a diagonal pattern. It is to be understood that the patterns of the knives on the gill bars are not peripheral speed thereof is higher than the pe ripheral speed of the retaining rolls 5 and 6, whereby the desired draft may be obtained. In the instant invention, satisfactory results have been obtained when the ratio >of the peripheral restricted to the two illustrative embodiments shown in Figures 2 and 7, since it is obvious that the knives may be arranged to produce staple >fibers of any predetermined lengths and in ac speed of the retaining rolls to the peripheral speed’ _ of the drawing rolls is 1:3.5 or 1:4, although it is understood that any desired degree ofdraft may be obtained by adjusting the ratio of the pe cordance with any pattern desired. ` Each knife I5 comprises a body portion I5 and ripheral speed of the retaining rolls to the draw- ~ a triangular portion which is provided withY the 20 ing rolls. cutting edge Il. The‘knives may be supported ' In the space intermediate the retaining rolls onthev gill bars in various manners. As shown 5 and 6 and the drawing rolls 'I and 8, there-` is in Figure 3, each knife may be provided with a plurality of pins I8 which may bev inserted in the holes which normally receive the gill pins I2. Alternatively, each knife I5 may be providedwith provided a gill bed, generally vdesignated by the reference numeral I0( The gill bed comprises a plurality of gill bars II, each of the gill bars being vprovided with a plurality of gill pins I2. In the form shown, each gill bar II is provided with two rows of gill pins I2 arranged in stag gered relationship. It is to be understood that the invention is not restricted to this precise arrange ment and number of gill pins, since it is apparent a tongue I9 which'is inserted in a corresponding groove formed in one- of the faces of the gill bar. 30 that a >greater or lesser number of gill pins, ar ranged in either a single or plurality of rows and When the knives are madenof heavy steel,- for example that used in the manufacture of hack saw blades, they may be secured, as by soldering, to the face of the gill bar, as shown in Figure 5'. Another modification of providing the gill bars with the knives in accordance with the instant in vention is shown in Figure 6. In vthis embodiment, each knife I5 is positioned in a clip 20 which 4is provided `with rings 22 on the rear face there of and which are designed to slip over the gill veyer I4, which is driven in the usual manner pins I2. The front portion 24 of the clip 20 serves (not shown). Itis to be understood that there as a compression spring and thereby Asecurely is also provided a pair of high pitch screws, simi 40 holds each knife in position. A depression or lar to' screws I4, in a plane beneath the plane tongue 26 formed in the clip 20 cooperates with occupied bythe screws I4. Normally, the lower a hole (not shown) in the knife to more securely pair of screws are of a higher pitch than the pitch y‘hold the knife in position. ` Ä ofthe screws I4, so that the gill bars may be The height of the knives I5 Vis such that when transferred and elevated quickly to operative po a faller bar is elevated from inoperative position sition. The screws I4 are driven so that the gill Ato operative position, the knife will engage and `bars during operative position will travel at a transversely cut the tow engaged thereby. The speed slightly in excess of the peripheral speed of shape of the knives and the effective width and the retaining rolls. Usually, the speed of travel position of the cutting edgeor edges thereof rela 50 of the gill bars is approximately 10% higher than tive to the gill :pins is in part dependent‘on the the speed of the retaining rolls. size ofthe tow, the degree of drafting, and the ' The retaining rolls 5 and 6, the drawing rolls material constituting the tow, Thus, the top edge ~`I andy 8, and the gill bed IB, aswell as the appur of the knives may be in alignment with or above tenant driving mechanisms, are all of the stand ci Ul orbelow the tops of the gill pins. In one embodi 'ard types common in gill drafting frames. ment, satisfactory results are obtained when, in The gill bars II, as shown in Figure 2, are pro `the triangular knife shown, the angle between the vided with a plurality of knives A to J inclusive, knife edges I1 vis approximately not less than 60°, which are arranged in a triangular pattern. The such as, for example, 90°, and the tip of the knife spacing of the knives A to J inclusive relative to at the apex thereof is in alignment with or slight -each other determines the extent of the staggered GO ly below the tips of the gill pins, as in Figures 3, relationship of the staple fibers. The spacing of 4 and 5, or slightly above the tips of the gill pins, either in parallel or staggered relationship, may be used. >lilach gill bar, at each end thereof, is provided with a boss I3 which is designed to en gage a groove of a high pitch spiral screw con 'the correspondingly positioned knives A and A, Band B, etc., determines the length of the sta ple. Thus, for example, if a stable fiber of as shown in Figure 6, g ' In operation, a plurality of ends 2 of rayontow 14”' in length is desired, the distance between 65 .are fed to the gill drafting frame. As the tow is ,fed from the retaining lrolls 5and 5, each of the lthe Icorrespondingly positioned knives A and A, knives on the faller bar, which is'elevated into ‘B and B, etc., is each 4", and the extent to operative position, engages and severs the portion which the ñbers are staggered is the distance of the tow contacting therewith. In manyin. l`between the knives A and B, B and C, etc. Thus, stances, ifl the section’ of the tow is'not severed for example, if this overlap isdesired to be l/i”, v470 4upon the elevation of the' gill bars into 'operative the distance `between the knives A and B, B and position, it will be severed at some time vduring fC, etc.,- is made 1/i”. Obviously, the length of the the passage to the drawingrolls. , Simultaneously `staple fibers and the degree of staggering also with the cutting, the drawing rolls draw or‘elon ldepend on the relative speeds o_f the rolls 5, 6, 1 gate the sliver, the gill pins aiding in this opera 75 and E, and Athe gill vbed I0,'which can be adjusted 5 2,410,307 tion by imposing a retaining or holding action on the ñbers. It is >to be noted that during the operations of producing and drawing the sliver the latter is continuous with the tow and the par allel arrangement of the fibers is not destroyed. From the drawing rolls ‘l and 8, the resulting rayon top passes through a condenser or trumpet a plurality of knife holders removably disposed on said gill pins in accordance with a predeter mined pattern, and a knife positioned in and car ried by each of said knife holders. 2. An apparatus for directly converting tow to top while maintaining the substantial parallelism of the fibers and the continuity of ythe tow and 28, wherein the top is laterally compressed or sliver, which comprises a gill drafting frame hav condensed particularly to remove >the feather ing a plurality of gill bars, each of said gill bars edge obtained in the preceding operation. The 10 being provided with a plurality of gill pins, a laterally compressed top, upon leaving the trum plurality of knife holders, each of said knife hold pet, passes between a driving roll 30 and a pres ers having ears on the rear thereof to cooperate sure roll 32 constituting condensing or compact with the gill pins whereby said knife holders are ing rolls which, after compaoting and condensing removably disposed on said gill pins, each of said the top, delivers it into .the ñberboard can 34, knife holders having a clip and a knife positioned which is given an oscillatory movement in order in each of said clips, said knife holders being ar to uniformly lay the top in the can. ranged in accordance with a predetermined pat Although the invention has been described with tern. reference to an open gill drafting frame, it is An apparatus for directly converting tow to equally applicable to intersecting gill frames, in 20 top3. while maintaining the substantial parallel which case the knives may be affixed to either the ism of the fibers and the continuity of the tow lower or upper faller bars or to both. and sliver, which comprises a gill drafting frame Since it is obvious that various changes and having a plurality of gill bars, each of said gill modifications may be made in the above descrip bars being provided with a, plurality of gill pins, tion without departing from the nature or spirit a plurality of knife holders, each of Said knife thereof, this invention is not restricted thereto holders having ears on the rear thereof to coop except as set forth in the appended claims. erate with the gill pins whereby said knife hold I claim: ers are removably disposed on said gill pins, each 1. An apparatus for directly converting tow of said knife holders having a spring clip and a to top while maintaining the substantial parallel 30 knife positioned in each of said clips, said knife ism of the fibers and the continuity of the tow holders beng arranged in accordance with a pre and sliver, which comprises a gill drafting frame determined pattern. having a plurality of gill bars, each of said gill bars being provided with a plurality of gill pins, JOSEPH B. RUMSEY.