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Патент USA US2127606

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Aug. 23, 1938.
- w_ G, LEA
_
2,127,606
GUIDING LONG FLEXIBLE BODIES
Filed Jan. 7, 1957
~
-
INVENTOR
I/V/W/OW? Georye Lea
I
(‘WM
‘
ATTORNEYS
Patented Aug. 23, 1938
2,127,606 I
UNITED STATES PATENT OFFICE
2,127,606
GUIDING LONG FLEXIBLE ,nonms'
William George Lea, Rome, Ga., assignor to Tub
ize Chatillon Corporation, New York, N. Y., a
corporation of Delaware
Application January '7, 1937, Serial No. 119,389
1 Claim. (Cl. 2424-18)
This invention relates to rayon manufacture,
and is concerned primarily with maintaining
variability in its abilityto take up certain dye
stuffs.
uniform tension, on rayon strand as it passes
from a spinnerette to a spool on which it is
As a result of my investigations, I have dis
covered that uneven strain in cross-winding with
5 wound.
In the manufacture of rayon by the bobbin
process, a viscous dispersion of a cellulose de
rivative or other suitable compound is extruded
from a spinnerette into a coagulating or setting
ll-medium, whence it passes to a revolving spool
on which it is cross-wound. In its travel the
- strand passes through a guide, which is mounted
upon a traverse, and it is thereby caused to re
ciprocate in a plane parallel to the axis of the
Brotating spool. In modern practice, it is cus
tomary to cross-wind the freshly spun rayon by
the "quick-traverse” method, which means that
the reciprocating motion is comparatively rapid
with respect to the number of revolutions made
DVD-by the spool in‘unit ‘time, the object being to
produce an open wind, characterized by inter
stices which facilitate the passage of vliquids
through the yarn cake during subsequent wet
processing steps.
35
'
Several kinds of‘ traverse motion are known.
Amongst theseis the type conventionally known
as the “oscillating'lpendulumh It is this type
with whichimy invention is particularly con
cerned although it
be evident to those skilled
'0 in the art ‘that the principle of my invention is
equally applicable‘ ineonnection with the type
of traverseknown as the ,'‘horizontal traverse".
In the pendulum-type the thread guide is
amxed at or near'the end of the pendulum arm,
3‘ which is suspended from a rocking shaft, and by
virtue of the oscillatory motion, it describes an
arc of a circle.
As the‘ traverse guide moves
back and forth, the distance between it and the
‘ spinnerette constantly changes, being at a maxi
‘0 mum when the guide is swung to. a position oppo
' site the ends of the spool, and at a minimum
when in its passage it occupies a position mid
way between these extremes.
Freshly spun rayon is still substantially plastic
at the instant that it reaches the traverse guide,
because it is not practical in modern rayon man
ufacture to attempt to provide conditions where
by the ?laments are completely solidi?ed during
the brief moment of their passage from spinner
ette to bobbin. A constantly changing tension
or strain is exerted on the strand, which is re
?ected in a periodic andunequal deformation
throughout its length. This is eventually mani
fested in the finished yarn by a corresponding
the aforementioned resultant defects in the 5
wound product may be largely eliminated if the
distance between the reciprocating or traverse
guide and the spinnerette is kept substantially
constant during the traverse stroke, and I have
developed an improved apparatus in which this 10
constant relationship is maintained.
In accordance with my invention, the distance
between the rocking shaft and the traverse guide
is caused to change as the pendulum is swung
back and forth, instead of causing the distance 15
between the spinnerette and traverse guide to
change as is true of existing pendulum traverse
motions. This is done by placing the traverse
guide on an extension of the pendulum, the ex:
tension being slidable along the pendulum on a
line substantially perpendicular to the major axis
of the rocking shaft. The extension of the pen
dulum is provided with a rider which is adapted
to slide in a track lying transversely to the ex
tension and parallel to the plane which the pen
dulum describes while swinging.
25'
The track
should be so curved that the rate at which the
pendulum extension slides on the pendulum when
the'latter is swung back and forth is such as to
keep substantially constant the distance between
the traverse and the stationary guide.
My invention is also applicable to that type of
traverse mechanism in which the pendulum is
replaced by an arm which does not swing but
instead is oscillated uniformly throughout its
length.
‘
'These and otheraspects 'of my invention will
be more thoroughly understood in the light of
the following detailed description taken in con— 40
l'unction with the accompanying drawing, in
which
Fig. 1 is a, diagrammatic sectional front eleva
tion of a presently preferred form of the appa
ratus of my invention, and
5
Fig. 2 is a diagrammatic sectional side eleva- 4
tion of the apparatus of Fig. 1.
_
I
Referring to the drawing it will be seen that
a conventional type of bobbin I is rotatably
mounted on a base 2 by means of a'concentrically 5o _
disposed spindle 3 and ‘a journal 4 fastened to
the base and through which the spindle passes.
A conventional driving means (not shown) is
provided for rotating the spindle and the at
tached' bobbin.
.
.
.
55
2
_
2,127,606
A stationary aperture which may be ring guide‘
the yarn. Kit is desired to form a yarn cake
5 (or a spinnerette, not shown) is mounted at a
considerable ‘distance from the bobbin in an
having bevelled ends the angle through which the
shaft is rocked is progressively decreased during
the winding of a cake, by any of the several
known mechanisms for effecting this result.
imaginary plane passing perpendicular to the
K longitudinal axis of the bobbin and the spindle
at about the center of the bobbin.
A traverse guide 6 such as a ring is disposed ad
As the pendulum is swung back and forth its
effective length, i. e. the distance from the center
of the rocking shaft cross-section to the traverse
jacent the bobbin and is adapted to reciprocate
in a second imaginary plane substantially parallel
10 to the longitudinal axis of the bobbin, said plane
is changed in periodic progression. At the outer
passing through the stationary guide.
A rocking shaft 8, such as a pipe, is disposed on
the pendulum is greater than at the center of
termination of each stroke the effective length of 10
each stroke because the sliders riding in the tracks
pull the extension and cause it to slide upon the
guide and spaced at a considerable distance from pendulum. In other words, as the pendulum is
15 the bobbin. The rocking shaft lies with its lon
swung back and forth, the pendulum reciprocates 15
gitudinal axis in the aforementioned second plane > in the cavity in the extension of the pendulum.
and at right angles to the longitudinal axis of the The are through which the traverse reciprocates
.bobbin. Conventionalmeans (not shown) are is, therefore, dependent upon the curvature of the
provided for rocking the shaft through a rela
20 tively small angle, the size of which is determined
In the case illustrated the arc described by the
by the length of the bobbin and the distance from traverse is a circular one having its center at'the
the side of the bobbin opposite to the stationary
tracks.
the bobbin to the rocking shaft.
Fastened around the rocking shaft by a pair of
bolts 9, I0 is a split collar II. The collar half I!
25 nearer to the bobbin is provided with a cylindrical
boss l3 formed integrally therewith and provided
with a concentric hole into which is ?tted rigidly
the end of a pendulum l4. One end of the pendu
lum is held in the boss by a pin l5 passing through
80 the pendulum and the wall of the boss. The op
pos'ite end of the pendulum is formed integrally
as a cylindrical rod 14a which ?ts slidably into a
cylindrical cavity running lengthwise in an end of
an elongated extension it of the pendulum. The
other end of the extension is attached to the
traverse. The wallof the cavity in the extension
is slotted longitudinally on both sides. A guide
pin i1 is fastened in the pendulum and passes
into the slots on both sides of the extension so
5- that the extension and the pendulum will not ro
tate with respect to each other, but are free to
slide one within the other.
About midway on the extension and on each
side are respectively rotatably mounted two riders
l8, l9 by means of a pin 20 passing through the
extension and the approximate centers of the
riders. These riders are shaped like short seg
ments cut from a ring of rectangular cross section
and are free to turn on the pin. A cylindrical pin
50 mounted rider may also be used.
.
Each rider is mounted respectively in tracks 2|,
22 each comprising a pair of arc-shaped rails 2 l A,
ZIB, ,22A, 223, which are curved to ?t the slider.
The/tracks in turn are fastened to the face of rigid
arms 23, 24 mounted on the base.
'
' -'
The tracks extend in a plane parallel to the axis
of the bobbin and parallel to the plane of swing
of the pendulum. They are curved about a point
lying on an imaginary line (drawn from the
60 center of the rocking shaft cross-section to the
stationary guide) between the tracks and the sta
tionary guide. The radii of curvature of the
tracks are such that, as the pendulum is swung
back and forth by the rocking shaft the end of
65 the pendulum extension carrying the traverse de
scribes a circular are having its center at the sta
tionary guide.
>
In the operation of the mechanism illustrated,
freshly spun yarn 25 is passed through the sta
70 tionary guide and then through the reciprocating
traverse guide to be wound on the rotating bobbin.
Force is simultaneously applied to rock the rock
ing shaft through an angle such that the trav
erse‘stroke is equal to that portion of the length
75 of the bobbin on which it is desired to build up
_
.
ring guide, for the reason that in such case the
yarn between stationary guide and traverse is
subjected to uniform tension. If, however, for
25
any reason it should be desired to move the trav
erse through an arc of any other shape or radii o'r ‘
even through a straight line, this can be accom
plished by making the tracks with an appropriate
curvature in accordance with well-known geomet
rical principles.
,
The invention has been described in detail as
applied to a pendulum type of traverse mecha
nism. However, it is equally applicable to the
type of mechanism in which the pendulum is re
ciprocated transversely to its length instead of
being swung, as will be immediately apparent.
Thus the apparatus of Figs. 1 and 2 may be
arranged so that the rocking shaft 8 is not rocked
but instead is reciprocated transversely to its
major axis in a plane perpendicular to the pendu
lum. This may be accomplished by a number of
known mechanisms (not shown) employed in the
textile industry.
.
Inasmuch as the pendulum I4 is clamped to
the shaft which is reciprocated laterally instead
of being rocked, the pendulum is reciprocated as
distinguished from being swung. However, the
lateral reciprocation will result in changing the
distance between the movable guide 6 and the
stationary guide 5 unless some'means are pro
vided for changing the combined effective length
of the members I4, “A. This is ‘accomplished by
the same means as in the pendulum type of trav
erse mechanism described herebeiore, except that 55
the curvature of the slider and the tracks is
changed.
'
I claim:
In apparatus for guiding an elongated plastic
?exible body of uniform cross section having a. 60
pair of neighboring guides through which said
body is passed in _a relatively taut condition, one
of said guides being stationary and means being
provided for reciprocating the other guide trans
versely to the ‘direction of passage of the body, the 65
improvement which comprises means for main
taining substantially comtant the distance be
tween said guides during reciprocation of the re
ciprocable guide, said means including an elon
gated arm oscillatable in a direction transverse 70
to its major axis and to the direction of passage
of said body, an elongated extension mounted
slidably on said arm and bearing the recipro
cable guide, a track disposed in a direction trans
verse to the major axis of the arm and to the
2,127,606
'
3
direction of passage of the body, and a rider and maintaining the distance between the guides
slidably mounted on said track and. attached to substantially constant, so that the plastic body
the extension, .the curvature of the track being‘ is subjected to substantially- uniform tension as
it passes through the guides and. remains sub
such that the extension periodically slides longi
stantially uniform in cross section.
tudinally on the arm during oscillation of the
latter, thus changing the effective vcombined
WILLIAM GEORGE LEA.
length of the arm and the extension periodically
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