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Патент USA US3027628

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April 3, 1962
R. w. LIST ET AL
3,02 7,619
CRIMPING TEXTILE STRANDS
Filed Nov. 27, 1956
31 53
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Unite States Patent
Patented Apr. 3, 1962
1
2
3,027,619
the respective levels of the two plates, and a crimping
tube 5 extending from above the nip of the feed rolls to
CRIMPING TEXTILE STRANDS
Ralph W. List, 35 Lexington Ave., East Lansdowne, Pa.,
and Ira Schwartz, 615 W. Arbutus St., Philadelphia,
Pa.
Filed Nov. 27, 1956, Ser. No. 624,613
10 Claims. (Cl. 28-4)
a level well above the top of the facade. Four thumb
screws 6 hold washers 16 against the front of the tube
to retain it in place against the front of the facade. A
portion of drive motor 19, which is mounted on the top
plate, in visible extending to the side from behind the
facade. Also apparent, located just below the roll nip,
are infeeding block 7 and clip 8; the block is retained
strands, concerning especially improved con?nement 10 against the facade by thumbscrew 13 threaded into the
facade through slot 23 in the lower part of the block.
thereof in the crimping chamber.
At the left side, screw 14 holds the clip against the block
The major elements of the well-known type of strand
in like manner, i.e., clip 8 is provided with a ?ange hav
crimping apparatus designated generally as “stuifer
This invention relates to stuifer-crimping of textile
crimper” include a chamber to receive and con?ne a
ing a slot through which screw 14 is threaded into the
strand, a movable (e.g., hinged or reciprocable) obstruc 15 side of block 7. The block and clip together form a
feed guide for strand entering the nip.
tion at or near the outlet end of the chamber to impede
Strand 1t), seen to pass between the block and the clip
passage of the strand, and a pair of rolls at the inlet end
and into the nip of the feed rolls, enters the yoke-like
of the chamber to feed or “stuff” the strand into the
bottom of the tube (shown in broken lines) and passes
chamber. In such devices, much of the back pressure
applied in order to con?ne the strand in the chamber 20 upward through the bore of the tube, where it is crimped.
Part of the tube is cut away in this view to reveal ac
sul?ciently to impart a crimp to it (and to its component
cumulation 20 of crimped yarn in bore 15 of the tube
?laments) is dissipated as frictional force against the
and to show shoulder 25, above which the bore enlarges,
walls of the chamber; moreover, drag imposed by the
about halfway between the level of the roll tops and the
impeding or back-pressure device on the components of
the strand when withdrawn thereagainst as a lengthwise 25 top plate. From the top of the tube, crimped strand 10'
passes about idler roll 9, through spring-tensioner 11
traveling strand, rather than as a con?ned accumulation
(shown schematically) and into the nip‘ of forwarding
or bunch of crimped material, is so great as to impair or
lessen the acquired crimp.
A primary object of the present invention is improved
rolls 12, 12'.
Visible at the left of the facade are respective upper
staffer-crimping of textile strands. An object is re 30 and lower shafts 17 and 18 carrying rotatable pulley
27 and stationary sheave 28, respectively, over both of
duction in the travel of strands while under crimping in
which passes belt 29. The right end of the upper shaft
?uence in a stulfer-crimper. A particular object is ap
protrudes at the right of the facade through adjacent bush
plication of crimping back pressure in the near vicinity
ing 37; bushing 37' surrounds the shaft adjacent the facade
of the feeding rolls of a stuifer-crimper. Other objects
of this invention, together with means and methods for 35 at me lert side of the viewer.
FIG. 2 shows the apparatus of the preceding view from
attaining the various objects, will be apparent from the
following description and the accompanying diagrams.
the right side. In addition to elements previously visible,
this view reveals motor shaft 31 extending rearward and
carrying drive pulley 32, about which belt 33 passes. This
the present invention; FIG. 2 is a side elevation of the 40 drive belt also passes about pulley 36 carried on axle 34,
which carries roll 4 at the other end. Gear 33 affixed to
apparatus of FIG. 1; FIG. 3 is a horizontal section taken
this axle meshes with a like gear on the axle (hidden in
at 3-3 of FIG. 2; and FIG. 4 is a fragmentary side
this view) for the other roll, both axles being rotatably
sectional elevation taken at 4—4 of FIG. 1.
supported in back plate 30 rising from the base plate.
In general, the objects of the present invention are ac
At the left side of FIG. 2 belt 29 can be seen passing
complished by forcibly feeding a textile strand into a
about sheave 28, whose shaft is bound in pillow block 41
crimping zone, continuously impeding, at a fixed location
retained against the back of the facade by upper and lower
relative to the crimping zone, the passage of the strand
cap bolts 42, 42'. The upper end of the belt passes behind
from the crimping zone by means of a unidirectionally
a protruding portion of toothed wheel-like element 45,
movable impeding element having an endless strand-en
50 which is affixed to shaft 17. The remaining views further
gaging peripheral surface effective to accumulate and
illustrate this element, which functions to impede passage
crimp the strand in the crimping zone, and releasing the
of the strand accumulation upward through the bore of
accumulated and crimped strand from the crimping zone
, FIG. 1 is a front elevation of apparatus (shown par
tially cut away) constructed and operated according to
the crimping tube.
FIG. 3 shows the apparatus sectioned substantially hori~
55
zontally under the top plate at 3—3 of FIG. 2. Bore 15
ment. The invention contemplates application of the im
of the crimping tube is partly obstructed by the gear-like
peding force to the unidirectionally moving strand by
strand-impeding element, which passes through opening
impeding means moving likewise. As particular appara
47 in the facade and slot 49 in the back of the crimping
tus for practicing the above process, this invention com
prehends strand-con?ning means having a bore adapted 60 tube so as to intercept the bore transversely (from the
rear); the accumulation of crimped strand is omitted from
to receive a textile strand in one end and to emit it at
this view to reveal the intercepting portion of the gear
the other end and a strand-impeding element intercepting
with the inside wall of the tube surrounding it. Axles 34,
the bore and adapted to move therealong and to retard
34' from respective feed rolls 4, 4’ extend rearward
passage of the strand therethrough.
through the facade to and through supporting back plate
FIG. l‘shows apparatus according to the present in
by directing the force of the crimped strand against the
impeding element and‘thereby moving the'impeding ele
Prominently visible
30. Axle 34' carries driven gear 38’ in mesh with drive
are base plate 1 and top plate 2 extending horizontally,
front plate or facade 3 extending vertically from the bot
tom plate to and above the top plate, a pair of feed rolls
4, 4’ located side by side .in front of the facade between
gear 38; in the interest of clarity the drive belt is omitted
vention as viewed from the front.
from‘ this view, while the driving pulley (located above
the plane of the section( appears in phantom.
FIG. 4 is a central sectional view taken (as indicated
3,027,619
4
3
at 4—4 of FIG. 1) in the same direction as FIG. 2.
The infeeding strand is visible proceeding straight upward
through the guide formed by block 7 and clip 8 to and
through the roll nip and into the bore of the crimping
tube (by which level a departure from rectilinearity of
the yarn con?guration is apparent), and then upward
through the tube. In this view the gear-like strand~im
above the impeding or obstructing location so as to assure,
prompt release of the strand from the force applied to
crimp it. This minimizes the distance through which the
strand passes compressed against the wall of the crimping
chamber, which itself preferably has a very low coef?ci
ent of friction, as may be obtained by a satiny or similar
metal ?nish of the inside wall, or—as preferred according
to this invention—by a coating of polytetra?uoroethylene
peding element is seen to intercept the bore to at least
about the depth of one tooth and approximately one-third
or the like on all or part of the wall. Furthermore, the
to one-half the bore depth. The teeth themselves are 10 crimped yarn is relieved from the impeding force quickly
and evenly while still accumulated or bunched together,
raked opposite to the direction of yarn travel. The strand
accumulation, which is compressed tightly at and below
the level of interception, loosens perceptibly at higher
eliminating the disadvantage (inherent in conventional
stutfer-crimpers) of dragging withdrawal of the crimped
strand longitudinally past an impeding element, which
levels, as is especially noticeable at and above the shoul
der of the bore. The top portion of the tube shows no 15 tends to remove the crimp, as will be apparent to one
familiar with that art.
such accumulation but only the individual crimped strand,
Various apparatus modi?cations may be made that do
which is being withdrawn lengthwise upward. In addi
not involve a departure from an embodiment of the
tion to the cap bolt extending through the pillow block
present inventive concept. Of course, as suggested above
into the back of the facade, this View also indicates in
broken lines setscrew 5t) threaded through the block and 20 for the crimping tube itself, one or more of the various
elements may be fabricated in a multiplicity of pieces for
against shaft 18 to bind the axle of the stationary sheave.
Operation of the described and illustrated apparatus is
convenience in manufacture, assembly, or maintenance;
alternatively, two or more elements (such as the facade
readily understood. The strand to be crimped, which usu
and the crimping tube, for example) may be combined into
ally is supplied from a bobbin or pirn (not shown) located
below the feed rolls, is threaded manually between the 25 a single housing or similar element. The shape of the
crimping chamber itself may be altered; for example, it
rolls, with its end inserted in the inlet of the crimping tube
may ?are outward toward the end from which the strand
directly above the nip of the feed rolls. The motor is
exits, and the shape of the opposite or intake end of the
started, whereupon the rolls rotate to feed the strand into
tube, whose side walls terminate in vertexes closely ap
the tube, which soon becomes ?lled up to the level of
the intercepting gear, whereupon the back pressure exerted 30 proaching the peripheral surfaces of the respective feed
upon the accumulated strand increases markedly. There
after, upon entering the tube, the strand bends back and
rolls, may be varied as desired for adequate “doctoring”
of the rolls, i.e., ensuring entrance of all the fed strand
into the tube; similarly, the shape of the infeeding guide,
which also enters closely toward the nip of the rolls, may
end of the tube, as is customary in previously known
stu?er-crimpers, and these various deviations of the strand 35 be varied for a like purpose. If desired, the front or one
side wall of the tube or chamber may be made of glass or
from the original rectilinear con?guration are emphasized
transparent plastic to permit observation of the crimping
to the extent of- becoming a relatively permanent crimp.
forth and from side to side as it is stuffed into the bottom
With continued operation, as, more and. more strand, is
as it occurs.
The dimensional relation between the feed~roll radius
fed upward in the crimping tube, the accumulation of
crimped strand begins to force its way on upward through 40 and the bore of the tube (or similar crimping chamber)
may be altered throughout a wide range, but for best
the tube, rotating the gear that partially obstructs the
results the level at which maximum interception of the
passage. At all times, friction of slippage between belt
bore by the gear or other strand-impeding element oc
curs is separated from the chamber inlet by a distance no
tion to provide the essential crimping impedance. Of 45 greater than a single radius of the feed rolls. Too, it is
desirable that the effective release location of the strand
course, the amount of applied impedance is adjustable, as
29 and either rotatable pulley 27 or stationary sheave 28
(whichever exerts less force on the belt) retards the rota~
by variation in the tension applied to the belt. The teeth
of the gear, being raked oppositely to the direction of ro
tation, emerge cleanly from the leading portion of the
crimped strand accumulation, which proceeds upward
through the bore of the tube free of the back pressure
previously applied to it, while the following portions of
accumulation from the crimping in?uence, as here provid
ed by increase in the size of the bore, be located similarly
closely to the strand-impeding location. Of course,
loosening of the four thumbscrews permits vertical (and
slight horizontal) adjustment of the position of the crimp
ing tube; the position of the infeeding guide with respect
to the roll nip may be varied in like manner by means of
its retaining screw. Suitable provision may be made for
pressure.
55 adjusting the location of other elements, such as the feed
rolls relative to one another and the degrees of insertion of
Upon reaching the enlargement in the bore provided by
the impeding element in the bore of the crimping cham
the inner shoulder of the tube, the accumulated strand
her.
loosens appreciably, and no further crimping force is ap
the strand accumulation below the level of the impeding
gear are subjected uniformly to the same unvarying back
The strand-impeding element (shown here in gear-like
plied from there upward. The end of the strand, which
is to be threaded through the spring-tensioner and the 60 con?guration) may be constructed otherwise with similar
effect, although the con?guration illustrated and described
forwarding rolls, now may be grasped in any suitable
above is preferred at present. Instead of having teeth,
manner and be withdrawn for that purpose, or this step
this element may be similarly wheel-like in shape and
may be deferred until the end emerges from the top of
may present an otherwise irregular, frictionally effective
the tube. Alternatively, the strand may be threaded en
tirely through the apparatus (and on to conventional 65 surface to the strand; alternatively, a chain may replace the
gear or wheel. Whatever con?guration of impeding ele
windup mechanism) preliminary to initiation of the feed
ment may be employed, its peripheral surface will be
roll drive; such threadup can be facilitated, as will be ap
movable in the direction of passage of the strand through
parent, by fabricating the crimping tube with all or part
of one side readily removable.
the bore of the crimping chamber, at a determinable rate
An important feature of this invention is concentration 70 su?iciently slow to impose considerable retarding force
of the region within which the strand is subjected to the
on the con?ned accumulation of strand._ As indicated
above, the impeding element need not occupy or obstruct
crimping in?uence. Not only is the impedance-providing
element (shown in gear form). located quite close to the
more than a minor portion of the transverse cross section
inlet of the crimping chamber (shown in tubular form),
of the bore, either widthwise ‘or depthwise, although it
but the bore of the chamber or tube enlarges immediately 75 may be set deeper if desired. More than one such e1e-'
I
8,037,619.
5
6
ment may-enter the crimping chamber oppositely, or a
strand in'the crimping zone, and releasingthe accumu
lated and crimped strand from the crimping zone by di
recting the force of the crimped strand against the im
multiplicity of such elements arranged contiguously may
constitute (for part of the passageway) the crimping
peding element to rotate the same.
chamber itself; however, use of a single strand-impeding
3. The process de?ned in claim 2, including applying
element appears preferable from the standpoint of sim
a uniform impeding force to the strand by the rotatable
plicity of construction and operation and of minimum
impeding element by applying a uniform yielding resist
interference with passage and removal of the crimped
ance to the rotation of the impeding element to crimp and
strand in undegraded condition.
accumulate the strand in the crimping zone.
The impedance offered to the passage of this strand
accumulation will depend not only upon the inset, con 10 4. A process of crimping a textile strand comprising
feeding the strand into a crimping zone, impeding the
?guration, and number of the strand-impeding ele
passage of the strand through the crimping zone by a
ment(s), but also upon the retarding force applied there
to, as by the illustrated belt arrangement. Of course, the
rotatable impeding element, and frictionally retarding the
rotation of the latter to accumulate and crimp the strand
may be inserted between the pillow block and the sup; 15 in the zone, the force of the crimped and accumulated
strand in the zone overcoming such frictional retarding
porting facade to increase the belt tension. Alternatively,
to rotate the element and release the strand from the
the relative sizes of the pulley and sheave or the sizeof
zone.
the belt may be varied. Even more simply, the illus
5. A stuffer-crimper comprising a pair of strand-feed
trated endless belt may be replaced by a length of belt
ing or the like affixed at one end to the facade, as by 20 ing rolls, a crimping tube having one end juxtaposed to
the nip of the rolls and with an opening intermediate its
one of the bolts, then passing over the pulley, and car
ends, and a gear-like strand-impeding element rotatably
rying at the other end a weight effective to force the
tighter the belt, the greater the impedance, and shims
“a
belting against the pulley and thereby retard its rotation
mounted on an axis essentially perpendicular to the axis
of the tube with its peripheral surface characterized by
retarding means, the shaft of the strand-impeding element 25 protruding teeth raked opposite to the direction of ro
to ‘the desired extent.
As yet another variation in the
may carry (instead of, or in addition to the pulley) vanes
tation, ?tting within the opening, and extending into the
inside of the tube.
whose rotation would be impeded by the surrounding air
6. The apparatus of claim 5, in which the location
or by liquid in a damping chamber, as will be apparent.
of maximum extent of the strand-impeding element into
Regardless of the design of impeding element or retard
ing means, the desired impedance and retardation will 30 the crimping tube is separated from the nip of the rolls
be dependent upon the strand as well as the apparatus;
by a distance at most equal to the roll radius.
the proper setting will be determined readily by observa
tion of the results of slight changes made therein.
tionally retarding rotation of the strand-impeding element,
7. The apparatus of claim 5, including means for fric
whereby passage of a strand fed into the tube and against
The procedure described above requires no control of
the height to which the strand accumulates above the 35 the strand-impeding element by the strand-feeding rolls
impeding element in the crimping chamber, inasmuch as
is opposed with a force independent of the feeding rate.
throughout a major part of the passage the strand is not
subjected to further external crimping influence; of course,
8. In a stulfer-crimper, the combination of a wheel
like element rotatably mounted on a ?xed axis, a pair
of strand-feeding rolls rotatably mounted on axes located
for convenience the forwarding rate will be synchronized
with the feeding rate to prevent overflow of the tube and, 40 a constant distance from and substantially perpendicular
to the axis of the wheel-like element, con?ning means
contrariwise, withdrawal of the strand directly from a
level below that of the impeding gear or similar element.
The processing rate can be controlled effectively by vary
forming an enclosed passageway between the nip of the
feed rolls and the wheel-like element and intercepting
part of the peripheral surface of the wheel-like element,
ing the retardation applied to the impeding element, as
well as by varying its size, shape, or degree of insertion 45 and means associated with the wheel-like element and
adapted to impart thereto a substantially unvarying fric~
into the bore of the chamber.
tional force effective to oppose rotation thereof by strand
The present invention is useful in the crimping of all
fed into and through the passageway.
manner of strands, whether made up of natural or syn
9. In strand-crimping apparatus having a tube-like
thetic materials, primarily those composed Wholly or in
large part of continuous ?laments, which usually are proc 50 chamber into and through which the strand to be crimped
is fed in continuous manner, the improvement compris
essed in relatively untwisted condition, although it is
ing strand-impeding means including a wheel-like element
adapted also to use with highly twisted strands and those
?xedly located with part of its peripheral surface inter
having staple components. Strands having thermoplastic
cepting the chamber and rotatably mounted to move
characteristics are usually well suited to the practice of
this invention, although it does not require any elevated 55 therein, upon contact with the strand, in the direction of
passage of the strand therethrough and a frictional re
temperature; moreover, immediate application of the in
tarding element continuously in contact with the wheel
vention to crimping of nylon multi?lament should not ob
like element and adapted to impart thereto a substantial~
1y unvarying frictional force effective to retard the ro
tion of the strand components,
The claimed invention:
60 tation thereof without altering the ‘direction of rotation
and thereby impede passage of the strand through the
1. A process of crimping a textile strand comprising
chamber.
feeding the strand into a crimping zone, continuously im
10. Apparatus comprising strand-con?ning means hav
peding, at a ?xed location relative to the crimping zone,
ing a bore adapted to receive a textile strand in one end,
the passage of the strand from the crimping zone by a
unidirectionally movable impeding element having an end 65 to accumulate it temporarily therein, and to emit it from
the other end; a ?xedly mounted wheel-like strand-im~
less strand-engaging periphery to accumulate and crimp
peding element intercepting the bore and adapted to con
the strand in the crimping zone, and releasing the accu
tact the strand therein, to impede passage of the strand
mulated and crimped strand from the crimping zone by
therethrough, and to move therealong in impeding con
directing the force of the crimped strand against the im
peding element to move the same.
70 tact with the strand in the direction of strand travel;
2. A process of crimping a textile strand comprising
friction-generating means continuously connected to the
feeding the strand into a crimping zone, continuously
strand-impeding element and adapted to impart thereto
impeding, at a ?xed location relative to the crimping zone,
a substantially unvarying frictional force effective to per
the passage of the strand from the crimping zone by a
mit movement of the strand-impeding means only upon
rotatable impeding element to accumulate and crimp the 75 su?iciently forcible contact of the strand against vthe
scure its relative independence of the chemical composi
7
3,627,619‘
strand-impeding element; and feeding means located at
‘the receiving end of the bore and adapted to feed a strand
forcibly into the bore to accumulate temporarily therein
and to contact the intercepting portion of the strand-im
peding element to move it in the direction of strand pas
sage, whereupon the strand is forced along the bore be
yond the strand-impeding element to emerge from the
opposite end thereof.
8
References Cited in, the ?le of this patent
UNITED STATES PATENTS
2,691,814
2,698,970
2,793,418
2,820,278
Tait ________________ __ Oct. 189, 1954
Wicker ______________ _._ Jan. 11, 1955'
Pfau ________________ __ May 28, 1957
Mariani et a1. ________ __ Ian. 21, 1958
UNITED STATES PATENT OFFICE
CERTIFICATE OF CORRECTION
Patent No. 3,02%619
April 3“ 1962
Ralph W. List at al.
It is hereby certified that error appears in the above 'numbered pat
ent requiring correction and that the eel d Letters Patent should read as
corrected below.
Column 2, line T‘I for "in" read —- is —-; line 68, for
"section(" read -- section) --; column 3, line 18v for "bolt"
read -- bolts -—; column 4? line 56, for "degrees" read
--
degree
-—.
Signed and sealed this 17th day of July 1962.
(SEAL)
Attest:
DAVID L. LADD
ERNEST W. SWIDER
Attesting Officer
Commissioner of Patents
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