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Патент USA US2410307

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Oct. 29, 1946.
Filed March 18, 19.45
-2 Sheets-Shee’rl l
Ott. 29, 1946.
2,410,307 I
Filed March 18, 1945
2 Sheets-Sheet 2
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Patented Oct. 29, 1946
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)
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
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
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
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;
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
In general, the objects of this invention. are ob»
tained by providing knives, arranged according. to
directly winditup as a ball warp.
~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
.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
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 .
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
4 ,
to produce the desired results. »Since the distance
(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
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.
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.
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
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
of the cutting edgeor edges thereof rela
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,
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,
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
and E, and Athe gill vbed I0,'which can be adjusted
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
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
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
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,
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