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Патент USA US2405885

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Aug- 13, .1946-
E. c'. GWALTNEY E'F- AL
YARN TENSIONING DEVICE
Filed Feb. 15, 1945
2,405,885
Patented Aug. 13, 1946
2,405,885
UNITED STATES PATENT OFFICE‘
2,405,885
YARN TENSIONING DEVICE
Eugene C. Gwaltney, Biddeford, ‘and Henry R.
Marsh, Saco, Maine, assignors to Saco-Lowell
Shops, Boston, Mass., at corporation-of Maine
1
Application February 15, 1945, Serial 'No. 578,031 I
8 Claims. (Cl. 242-449)
This invention relates to devices for applying
2
.
t are mounted, the lower plate'having an approxi
a tension or drag to a travelling yarn or thread.
mately ?at body portion with down-turned or
Such devices are commonly used in a consider
?anged ends 3'—‘3', resting on horizontal shoul
able variety of textile machinery and the ‘present
ders'5—5 atthe opposite ends of the recess. The
invention is directed more especially to the re Cl other plate 4 is similar to it but is provided with
quirements of those articles of this character in
up-turned sides extending longitudinally of it
which an exceptionally uniform degree of ten
and also with ?anged ends 6 and ‘I. These plates
sion must be maintained, and in which also a
very accurate adjustment of the degree ofv ten
sion is necessary.
For example, these requirements are extreme
have smooth ?at meeting surfaces. .
ly important in twisting machines of the so-oalled
“2 for 1” type. In them the yarn is drawn from
a supply body, usually stationary, and custom
arily is guided through that body along its axis to a ?ier revolving around said axis. From the
eye of the ?ier the yarn is fed to a stationary
tionary guide eye tends to ‘become excessive and
trolling the size of the balloon.
The present invention aims to devise a ten
sion device which will satisfy these requirements,
which can be manufactured economically, will be
exceptionally reliable in operation, and which
lower end it has a reversely curved section e,
can be quickly removed from the machine and
taken apart when necessary for any purpose as,
for example, to remove accumulations of lint and
Fig. 3, which rides in a slot 1‘ formed partly in
the lower extension I) of the body 2 and partly
in a yarn guiding bushing H3 secured in said ex—
tension by a set screw l 1i’.
fly.
The nature of the invention will be readily un
The particular tension device here shown is in
tended to ?t into the upper end of the tubular
section 8 of the yarn carrier shown in pend
derstood from the following description when
read in connection with the accompanying draw
ing, and the novel features will be particularly
pointed out in the appended claims.
In the drawing,
ing application Ser. No. 495,832, ?led July 23,
' Fig. 1 is a side elevation of a tension device -'
in Fig. 1;
Fig. 3 is a vertical, axial, sectional view of said
device, with some of the parts shown in eleva
tion; and
Figs. 4 and 5 are transverse, sectional views,
considerably enlarged, taken on the lines 6-4
and 5-5, respectively, of Fig. 3.
The construction shown in the drawing com
prises a tubular body, indicated in general at 2,
provided at one side with a recess and having
tubular yarn guiding sections, indicated at a and
b, respectively, above and below said'recess In
said recess lower and upper tension plates 3 and
the body 2, and it is clamped there by a set screw
in Figs. 2 and 4, and the flattened surface is
grooved longitudinally to receive said spring. Be
low the shank the spring passes through a radial
slot i3, Figs. 8 and 4, formed in a ?anged sec
tion 2’ of the body 2, and then through slots in
the two end ?anges 6 and ‘l of the upper plate
l-l. Between these points the spring is provided
with an inwardly bent portion or knee (1 which
bears on the upper tension plate 4, and at its
a, very accurate control of the tension between
the supply body and the flier is essential in con
Fig. 2 is a front elevation of the device shown
by providing it-with an inturned tip 0, Fig. 3, >
at its upper end, which extends into a hole pro
vided in the shank or tubular extension at of
iii threadedthrough the base of a cap l2 mount
ed on the upper end of said shank. This shank
also is ?attened on one side, as shown at a’
guide eye, usually located above and in line with
said body, and then passes to a wind-up mecha
nism. When the ?ier is run at high speeds the
balloon formed between the flier and the sta
embodying this invention;
’
Pressure is applied to the plates by a spring
8 of the leaf type and which preferably con
sists simply of a length of spring wire, suitably
bent, as will be described. It is held in place
1943, (now issued as Patent No. 2,374,085) and
to take the place of the tension device illus
trated in that application. As the yarn is drawn
from the supply body surrounding said tubu
lar section, it enters the eye g, Fig. 3, of the cap
vl2, and travels down through the tubular shank a,
through the bore of the yarn guiding bushing H3
at the lower end of said shank, passes between
the tension plates 3 and Al, and out through the
small bore of the lower yarn guiding bushing
M. It will be observed that these bushings l4
and l 55 are in axial alignment with each other and
with the yarn tube a and the eye 9.
Also, that .
this axis is in line with the flat meeting surfaces
of the two tension plates 3 and ll. Above the
tubular guiding section of the shank a, this mem
ber is enlarged somewhat to receive a body of
'55 felt 2d, or
other ?brous material, which bears
2,405,885
3
4
vice in which those factors controlling the degree
lightly on the yarn but with enough pressure to
of tension applied to the yarn are capable of very
apply a resistance sufficient to straighten out any
accurate adjustment.
loops or kinks that may be in it. Consequently,
At the same time the tension plates can be
the yarn travels freely through the entire body of
quickly removed for cleaning and replaced. The
the tension device except for the very light drag
same also is true of the cap 12 and the pre-ten
applied to its at 20 and the main resistance to
sion device 20 mounted in it.
its movement applied by the two tension plates.
While we have herein shown and described a
The part 26 is really a pre-tension element which
preferred emodiment of our invention, it will
ensures the straightening of the yarn before it
10 be evident that the invention may be embodied
passes between the tension plates 3 and 4.
in other forms without departing from the spirit
In order to adjust this tension with a high de
or scope thereof.
gree of accuracy, an annular slide or ringlB en
Having thus described our invention, what we
desire to claim as new is:
which may be tightened up to clamp the spring
firmly to the shank. At the side of the ring oppo 15 1. A yarn tension device comprising a support
ing body through which the yarn is guided, plates
site the set screw a pin I 8 passes radially through
supported in said body for pressing the yarn be
it and is ?xed in it, the inner projecting end
tween them as it passes through said body, a leaf
of this pin, as shown in Fig. 3, riding in a groove
spring pressing said plates together, said spring
formed longitudinally in the shank face a’ where
it prevents any rotative movement of the slide 20 extending in a direction generally parallel to said
circles the shank a and carries a set screw l1’
plates and means for adjusting the pressure so
exerted on the yarn comprising a slide bearing
against said spring and mounted on said body for
on the shank. Thus the screw l‘! is always held
directly over the spring 8 in all positions of ad
justment of the slide lengthwise of the spring.
Both tension plates are held in place by the
spring 3.
adjustment lengthwise of the spring.
The upper one may be slipped out of 25
its operative position merely by pressing down
2. A yarn tension device comprising a support
ing body through which the yarn is guided, plates
Wardly on one of its lateral flanges, thus caus
supported in said body for pressing the yarn be_
ing it to rotate around the spring 8 and to tip
out of place. If, then, the lower plate is lifted
tween them as it passes through said body, a
leaf spring pressing said plates together, means
be lifted out. Both plates may be returned to
their operative positions by a reversal of the op
and mounted on said body for adjustment length
wise of the spring, and means cooperating with
said spring to increase the pressure applied to
at one corner, it will also tip around the knee d 30 for adjusting the pressure so exerted on the yarn
comprising a slide bearing against said spring
and swing to one side of the recess where it may
erations just described.
I
,
From the foregoing it will be evident that the 35 the spring by the slide itself.
3. A yarn tension device comprising a support
active length of the spring 8 utilized in applying
ing body through which the yarn is guided, plates
pressure to the tension platelil is that between
supported
in said body for pressing the yarn be
the knee d and the set screw ll’. 'Also, that this
length can be adjusted accurately by the ar
rangement above described, and that the grada
tion of pressure can be made very gradual.
These are highly desirable results, particularly
when the device is used in a twister of the 2 for 1
type. While the slide alone is effective up to a
certain degree to adjust the active length of the
spring, there is a tendency, when the slide alone
is used, for the spring to bow outwardly above the
slide, and this action reduces the accuracy of
the adjustment. However, when the set screw
H is tightened up, it clamps the spring securely
to the body, thus increasing very substantially
the clamping pressure exerted by the slide itself.
This arrangement has been found highly effec
tween them as it passes through said body, a leaf
40
spring pressing said plates together, said spring
extending in a direction generally parallel to said
plates andmeans for adjusting the pressure so
exerted on the yarn comprising a slide bearing
against said spring and mounted on said body
for adjustment lengthwise of the spring, and
screw-threaded means cooperating with said slide
to clamp the spring to said body in any posi
tion of adjustment of said slide.
4. A yarn tension device comprising a support
ing body through which the yarn is guided, plates
supported in said body for pressing the yarn be
tween them as it passes through said body, a
leaf spring pressing said plates together, means
for adjusting the pressure so exerted on the yarn,
tive.
‘
Preferably the intermediate section 2’ of the 55 comprising a slide embracing a portion of said
body and disposed transversely thereof but
tension body is grooved to receive a soft rubber
mounted to slide longitudinally of said body, and
bushing 2i, somewhat larger in outside diameter
a device carried by said slide and riding on said
than the other parts of said body, so that it en
spring and adjustable relatively thereto to clamp
gages the inner surface' of the central tubular
member 8 of the carrier shown in the patent 60 the spring against said body.
5. A yarn tension device comprising a support
above referred to and provides a yielding contact
ing body through which the yarnv is guided, plates
with the bore of said member. This bushing has
supported in said body for pressing the yarn be
been omitted from Figs. 4 and 5.
tween them as it passes through said body, a leaf
Preferably, also, the upper adjacent surfaces
of the plates are slightly bevelled or grooved to 65 spring pressing said plates together, means for
form a short funnel section, as indicated at h
adjusting the pressure so exerted on the yarn,
in Fig. 5, to assist in guiding the wire customarily
used in threading up the tension device.
The capl2 may be made of any convenient
body and disposed transversely thereof but
mounted to slide longitudinally of said body, and
comprising a slide embracing a portion of said
material such, for example, as one of the molded 70 a set screw threaded into a portion of said slide
and positioned to bear on said spring, said screw
plastics, and it is releasably secured on the body
being adjustable to clamp the spring against said
2 by the set screw I ll.
body.
Fromv the foregoing it will be evident that the
_6. A yarn tension device comprising a support
invention provides a very simple and compact,
but rugged and substantial, form of tension de
75 ing body provided ‘with a'lateral- open-sided re
5
2,405,885
6
cess and with a tubular yarn guiding shank, two
opposed plates mounted in said recess to grip the
yarn between them as it travels through said
body, a leaf spring having a portion extending
along said shank and another portion bearing on
one of said plates to press them together, and
ing body provided with a lateral open-sided re
a slide mounted on said shank to engage said
spring mounted at one end on said shank and hav
spring and adjustable to vary the length of said
cess and with a tubular yarn guiding shank, two
opposed plates mounted in said recess to grip the
yarn between them as it travels through said
body, said plates having ?at, smooth-meeting
surfaces and oppositely directed ?anges, a leaf
ing a free portion extending along said shank and
spring e?ective to apply pressure to said yarn.
overlying said plates, said spring having a knee
'7. A yarn tension device according to preced 10 bearing on one of said plates to press it against
ing claim 6, in which said slide carries a set
the other, and a slide encircling a portion of said
screw to bear on said spring, and means cooper~
ating with said slide to guide it during its adjust
ing movement to maintain said set screw in posi
tion to bear on said spring at any point in its
range of adjustment.
8. A yarn tension device comprising a support
shank and overlying said spring, whereby the
slide is adjustable to vary the length of said
spring effective to press said plates together.
EUGENE C. GWALTNEY.
HENRY R. MARSH.
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