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Патент USA US2117387

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May 17, 1938.
c. E. WILLIAMS ET AL
2,117,387
MULE SPINDLE
Filed Feb. 24, 1957
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Patented May 17, 1938
2,117,387
UNITED ‘STATES ‘
PATENT OFFICE
2,117,387
MULE‘ SPINDLE
Chester E. Williams, Worcester, and Arthur F.
Anderson, Auburn, Mass., assignors to John
son & Bassettylnca Worcester, Mass., 3, corpo
ration of Massachusetts
ApplicationFebruary‘M, 1937, Serial No. 127,434
4 Claims.
This invention relates to mules ‘for spinning
yarn and more particularly to the spindles used
in such machines. Mule spindles are operated
.at the relatively high speed of 2000 to 4000
R. P. M. and the present tendency is toward still
higher speeds and also toward longer bobbins
and heavier yarn packages. This increase in
speed and also in load produces a correspondingly
increasing tendency toward vibration of the spin
10 dle whenever the load is unbalanced and the axis
of the center of mass of the combined bobbin
and yarn load fails to coincide with the axis of
rotation.
It is the general object of our invention to
15 provide an improved mule spindle, so constructed
that vibration due to unbalanced load will be
with an‘inner ball race 32 which ooacts with an
outer ball race 33 and a plurality of balls 34 to
form an‘ anti-friction bearing.
The outer race 33 is mounted in an enlarged
recessed portion 35 of a spindle step 36. A shoul
der 3'! forms an abutment for the race 33 when 10
forced therein. The step 35 is furtherprovided
witha central opening 38 and a recessed portion
39, through which lubricant may be supplied to
the anti-friction bearing through any usual type
of grease connection 40.
portion '43 of the outer periphery of the cap 36.
This dust cap or cover 42 is preferably formed
from sheet metal and the construction thereof is
clearly shown in Fig. 6.
The upper end of the dust cap 42 is so posi
tioned that it just clears the under surface of
A further object of our invention is to provide
a construction by which installation and removal
of spindles is facilitated.
Our invention further relates to arrangements
and combinations of parts which will be here
inafter described and more particularly pointed
out in the appended claims.
the drawing, in which
Fig. l is a sectional side elevation of our im
proved spindle‘ and its supporting structure;
Fig. 2 is a front elevation, partly in section,
of the
Fig.
Fig.
Fig.
spindle base or stand;
3 is an edge view of a bottom plate;
4 is a plan view thereof;
5 is a sectional side elevation of a bearing
step;
Fig. 6 is a side elevation, partly in section, of
the step bearing cap or cover; and
Fig. 7 is a side elevation, partly in section, of
the upper spindle bushing.
Referring to the drawing, we have shown a
45 portion of the frame 10 of a mule carriage hav
ing a front board I I, top board l2, bottom board
l4 and collar board l5, all of which parts are se
cured to the frame ID by screws l6.
Our improved mule spindle comprises a base or
50 stand 20 adapted to‘ be secured against a beveled
under surface 2| of the collar board l5 by spaced
binding screws 22. A spindle bushing 24 of
?bre, bronze or other suitable material is forced
into anopening 25 in the base 20 and projects
65 upward therefrom, with the beveled upper por
15
A dust cap or cover 42 ?ts snugly on a reduced
To the attainment of this object, we provide a
lower or step bearing ‘fora mule spindle which
is non-rigidly mounted ‘and which permits a
30 , A preferred form of the invention is shown in
40
tion of the bushing slidably ‘?tting an inclined
opening 26 in the collar board 15.
A spindle 30 is rotatably mounted in the spin
dle bushing 24 and at its lower end is provided
substantially eliminated.
slight free transverse adjustment of the spindle
to operating and load conditions.
2
(Cl. 118-66)
the whirl 45 which is engaged by the usual spin
dle band B for driving the spindle.
The spindle base or stand 20 is provided with
a lower portion 50 mounted at the lower end of
an offset connecting or gooseneck portion 5| and
having a recess 52 therein. The recess 52 is
slightly larger than the step 36, which ?ts some
what freely therein. A bottom plate 60 is secured M 0
to the under face of the base portion 50 by a
plurality of screws 6|, and is provided with a
central opening 32 to clear the grease connec
tion 40.
A pair of pins 64 are ?xed in the under side 01.’
the step 36 and extend downward through open
ings 65 in the plate 60 on which the step rests.
The pins 64 are somewhat smaller than the open
ings 65 and have limited free play therein.
Having described the construction of our im
proved spindle, it will be noted that the spindle
is a close running ?t in the upper spindle bushing
24, but that the lower end of the spindle is ro
tatably mounted in a step bearing which is free
to adjust itself radially of the spindle to a limited
extent. This limited transverse free movement of
the lower or step bearing permits the spindle to
adjust its position to an unbalanced load and
enables the spindle to run at relatively high speed
and substantially without vibration even under 50
unfavorable conditions.
This in itself is a very great advantage over the
previous practice in mule spindles, but our con
struction has the further advantage that each
spindle, spindle base and associated bearings 65
2
2,117,387
forms a separate spindle unit which may be as
sembled and adjusted to satisfactory running con
dition before attachment to the mule carriage.
Each spindle unit may also be separately removed
from the carriage for repairs or adjustment.
Furthermore, when a spindle is to be thus re—
whirl, a stand for said spindle supported by and
depending from said collar board, a bearing bush
ing for said spindle mounted in the upper end of
said stand and having a portion extending upward
moved, the band B may be easily slipped over the
into an opening in said collar board, and a lower
lower end of the spindle base as soon as the base
bearing for said spindle mounted in the lower
part of said stand and having limited free trans
is loosened, thus greatly simplifying the removal
and replacement of spindles as compared with the
15
previous practice.
verse movement relative thereto.
1O
3. In a mule having a carriage with a collar
We also ?nd it to be of great advantage to omit
the separately supported upper and lower spindle
bearings previously used and which required fre
board, in combination, a spindle having a driving
whirl, a stand for said spindle supported by and
depending from said collar board, a bearing bush
quent and careful adjustment in order to keep the
ing for said spindle mounted in the upper end of 15
said stand and having a portion extending upward
spindles running free.
Moreover, a spindle ro
tating in two ?xed spaced bearings was subject
to extreme vibration under an unbalanced load,
which vibration reduced the speed and resulted
20 in uneven twist, loose winding at the nose of the
bobbin, frequent yarn breakage and excessive
wear.
Having thus described our invention and the
advantages thereof, we do not wish to be limited
25 to the details herein disclosed, otherwise than as
set forth in the claims, but what we claim is:—1. In a mule having a carriage, in combination,
a spindle having a driving whirl, a spindle stand,
an upper spindle bearing ?xed in said spindle
30 stand, and a lower step bearing for said spindle,
said upper bearing being a close running ?t for
said spindle above the spindle whirl and said
step bearing being supported by said spindle
stand but having limited free transverse move
35 ment relative thereto, and said spindle, stand and
bearings comprising a self-contained unitary
structure having a single point of attachment to
said carriage at one end of said stand and said
stand being separately removable from the mule
40
2. In a mule having a carriage with a collar
board, in combination, a spindle having a driving
carriage.
into an opening in said collar board, and a lower
bearing for said spindle mounted in the lower
part of said stand and having limited free trans
verse movement relative thereto, the upper and 20
lower portions of said stand being joined together
by an offset connecting portion disposed entirely
at the rear of said spindle.
4. In a mule having a carriage with a collar
board, in combination, a spindle having a driving 25
whirl, a spindle stand, an upper spindle bearing
?xed in said spindle stand, and a lower step bear
ing for said spindle, said upper bearing being a
close running ?t for said spindle above the spin
dle whirl and said step bearing being supported
by a depending portion of said spindle stand, and
30
said spindle, stand and bearings comprising a
self-contained unitary structure entirely support
ed by said collar board and free in its lower por 35
tions, said unitary structure being separately re
movable from said mule.
CHESTER E. WILLIAMS.
I
ARTHUR F. ANDERSON.
40
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