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Патент USA US2411126

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Nov. 12, 1946.
2,411,126
v. A. BURNHAM
TWISTER FRAME
Filed March 2, 1945
1829.1
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Nov. 12, 1946. -
V. A. BURNHAM
2,411,126
TWISTER
Filed March 2, 1945
2 Sheets~$heet 2
'
Patented Nov. 12, 1946
2,411,126
UNITED STATES PATENT OFFICE
2,411,126
TWISTER FRAME
Virgil A. Burnliam, Saco, Maine, asslgnor to Sam
Lowell Shops, Boston, Mass, a corporation of
Maine
Application March 2, 1945, Serial No.'580,657
9 Claims.
(01.57-58)
2
This invention relates to textile twisting ma
chines of the so-called “2 for 1” type.
In Patent No. 2,374,085, issued April 17, 1945,
and assigned to the assignee of the present in
to a bar or rail of a twister, or similar machine,
carries a ring H on which the motor frame 6 is
mounted, and these parts are isolated from each
vention, a novel form of twister of this type is
shown and described which represents a very im- .
other by resilient rings or bushings H.
In order to support the vertical load on the
shaft 3’, the ball bearing 1 is selected from the
type adapted to take vertical thrust, as well as
radial load, and the shaft is provided with a
shoulder cooperating with the inner race of the
portant advance in machines of this general
character. While 2 for 1 twisters have been
known for almost a century, and much effort
has been expended in an endeavor to perfect 10
bearing to transmit the load applied primarily
them and make them available for general com
to it.
mercial use, they have never become at all com
The yarn package carrier, indicated in general
mon, primarily because they are inherently dan
at 12, comprises a horizontal plate-like member
gerous machines. The application above referred
to includes a disclosure of automatic stop mech 15 and an integral central tapered sleeve 13, the
bore of which is stepped, and one of the internal
anism operating on the magnetic principle, which
shoulders so formed rests on the upper of two
makes the machine entirely safe to operate, and
that invention, therefore, overcomes the very
serious handicap which has always attended the
use of these machines.
The present invention aims further to improve
and perfect the machine shown in the patent
above identified with a view to simplifying its
construction, reducing the cost of manufacture,
making the machine more adaptable to the re
quirements of different mills and varying condi
tions, and generally improving the construction
ball bearings 14 and I5, respectively, which are
mounted on the spindle. This upper bearing
a?ords vertical support for the carrier and the
20 load transmitted through it, while both bearings
cooperate to center the carrier radially on the
axis of the spindle. They support the former for
rotative movement around the spindle or, more
properly, they permit the carrier to remain sta
tionary while the spindle revolves inside of it.
The yarn supply body I5 is removably mounted
on the carrier and yarn drawn from this body
is led upwardly to the top of a tension unit I‘!
understood from the following description when 30 which is removably supported in the upper tu
bular section 13 of the carrier. It Eomprises two
read in connection with the accompanying draw
plates
spring-pressed together, between which
ings, and the novel features will be particularly
the yarn passes downwardly in to the upper
pointed out in the appended claims.
hollow portion 3 of the spindle blade and then
In the drawings,
out through an aperture l8 in the side of the
Fig. 1 is a vertical, sectional‘ view, partly in 85 blade to the guide eye of a ?ier 20. From this
elevation, illustrating a preferred embodiment
point the yarn travels upwardly to some suitable
of my invention;
form
of wind-up mechanism.
Fig. 2 is a plan view of a ?ier included in the
At
the
lower end of the hollow yarn-guiding
machine shown in Fig. 1;
Fig. 3 is a fragmentary right-hand elevation 40 section of the spindle it is slotted laterally from
one side to the other to receive snugly a rectan
of portions of the machine shown in Fig. 1;
gular thread-guiding block 2| having a curved
Fig. 4 is a sectional view of the yarn package
and operation of that machine.
The nature of the invention will be readily
carrier, the view being taken substantially on
the line 4-4, Fig. 1; and
passage therethrough and preferably made of
porcelain, or some equivalent material o?ering
very little resistance to the travel of the yarn.
Fig. 5 is a bottom view of the switch forming 45
one element of the control mechanism shown in . This block rests on a rubber bushing b set into
Fig. 1.
Referring ?rst to Fig. 1, the machine there
shown includes a hollow spindle blade 3 integral
the spindle at the bottom of the slot and these
parts and the ?ier are locked in place by and
between lower and upper sleeves 22 and 23, re
with the shaft 3' of an electric motor individual 60 spectively, both encircling the spindle. The for
mer is pinned to the spindle blade at its junction
to the machine. The motor includes a rotor 4
with the shaft 3'; a pin 0 positions the ?ier with
secured rigidly to the shaft 3’, a ?eld structure
respect
to it; the latter sleeve 23 bears on the
5, and a frame 6 carrying upper and lower ball
bearings ‘I and 8, respectively, in which the shaft
is supported. A bracket l0, shaped to be bolted
flier, and all of these parts, together with the
inner races of the bearings l4 and I5 are clamped
on the spindle by a nut 24 threaded on the upper
2,411,126
3
tends into a cam slot 33 in another lever 34 ful
crumed at 35_on said bracket. If the magnet
28 is repelled, as above described, it will swing
in a clockwise direction about its fulcrum point
stationary, two magnets 21 and 21’, Figs. 1 and 4,
3| and it quickly gains momentum due to the
are mounted in the base of the carrier l2 in di
action of gravity, thus carrying the pin 32 into
ametrically opposite positions, as shown in Fig. 4,
contact with the lower surface of the slot 33
with their pole faces just inside the downwardly
where it operates to swing the lever 34 also in a
extending circumferential ?ange of the carrier.
clockwise direction. The lower end of this lever
They are held in place by a bottom plate 25
which ?ts in the space between said ?ange and 10 is arranged to engage the plunger of a switch 36,
which controls the ?ow of current to the ‘motor,
the central tube l3 of the carrier body, the plate
and it opens this switch, thus cutting on‘ power
being secured to the main body of the carrier by
to the motor. At the same time a plunger 31,
two screws 26-46, Fig. 4, and also by two ad
having a pin and slot connection 38 with the
ditional screws 29-—29 which secure the sup
plemental carrier plate or cup 39 to the carrier 15 lower end portion of the lever 34, is forced in
wardly, and the inner end of this plunger
base assembly. Preferably the carrier body is a,
carries a brake shoe 40 which engages the outer
die casting made of a non-magnetic metal com
surface of a brake drum 4| secured rigidly to
position. Also, parts 25 and 39 are non-magnetic.
the lower end of the motor shaft 3'. The re
These two magnets 21 and 21' cooperate with
sult, therefore, is to stop the rotation of both
two normally stationary magnets 28 and 28', re
the motor shaft and the spindle. While the
spectively, mounted on the motor frame and
knock-01f action is initiated mainly by the
having their poles positioned in juxtaposed rela
mutual repulsive action of the magnets 21 and
tionship to the poles of the upper magnets, but
28, the kinetic energy of the falling mass of the
located immediately under the latter and in
nearly a right-angle relationship to them. The 25 magnet 28 and its arm are relied upon chie?y to
operate the lever 34 and subsequently to set the
poles, however, are reversed so that the north
brake 31 and open the switch 36.
and south poles of each upper magnet are posi
The parts of this stop mechanism may be re
tioned close to, and in opposed relationship to,
set merely by swinging the upper end of the arm
the respective south and north poles of the lower
magnets. This relationship of the magnets 21 30 30 back into its normal position, as shown in Fig.
1, where it is held by magnetic attraction, with
and 28 is clearly shown in Fig. 3, and the other
the stop lug 30' resting against the motor frame.
magnets 21' and 28’ are similarly positioned with
Also, when the stop mechanism has been oper
reference to each other. Consequently, the mag
ated, as above described,'the weight is so re
nets of each pair exert a strong magnetic pull on
each other and both pairs cooperate to hold the 35 lated to the pivot points that the parts will re
main in their knocked-oil" position until manu
carrier l2 normally against rotation.
ally re-set.
Also, the poles of the two magnets on the car
The other magnet 28' is mounted in a ?xed po
rier are reversed circumferentially with refer
sition on an arm projecting upwardly and lateral
' ence to each other, as in the arrangement shown
ly from the motor cap 42, this cap being secured
in the application above referred to, the two
by several screws, one of which is shown at d, Fig.
north poles being diametrically opposed and the
1, to the main body 5 of the motor frame or hous
two south poles also being diametrically oppo
ing. This cap may conveniently consist of a die
site each other. Consequently, if any substan
casting made of some non-magnetic material,
tially rotative movement of the carrier I2‘, Fig.
such as an aluminum alloy, or the like, so as to
3, should occur, two poles at opposite sides of
isolate the magnets from other parts in the base
the carrier would be brought into opposed rela
tionship to two stationary poles, respectively, of '
of the machine.
The motor used preferably is of a three-phase,
the same polarities, where they would exert a
high frequency type commercially available and
repulsive action, each upon the other. More
over, due to the reversed relationship of the 50 capable of driving the spindle and ?ier at speeds
of at least 10,000 R. P. M. Fig. 5 shows a switch
poles on the carrier, if this member should be
(not of my invention) which is suitable for con
revolved through an angle of 180°, then both
trolling the motor, although other forms of
poles of the magnet 21 would be brought into
switches may be substituted for it. It comprises
opposed relationship to both poles of the magnet
28, and a very strong repulsive action then would 55 an insulating body 43' provided with stationary
contacts 44-44 adapted to be engaged by addi
be produced. Such rotation of the carrier oc
tional contacts formed on the opposite ends of
curs only when something has gone wrong in
a bar 45 mounted on a plunger 46. Another pair
the relation between the carrier and the spindle
of contacts 41-41 are similarly supported for
and when, therefore, it is absolutely essential
to the safety of those in the immediate vicinity 60 engagement with those of a second bar 48 also
mounted on said plunger. Normally a spring 50 of the machine that it be shut down.
holds the plunger in position to close the circuits
The present invention makes use of the re
of two phases through the contacts 44 and 41, but
pulsive effort created between the magnets at
when the lower end of the lever 34strikes the head
this time, together with the action of gravity, to
5| of the plunger 46 and forces it toward the left,
stop both the motor and the spindle. For this
Fig. 5, it opens both circuits. This shuts down
purpose the magnet 28, Fig. 1, is secured rigidly
the motor, regardless of the fact that the third
on the upper end of an arm or lever 30' fulcrumed
end of the blade section 3. Intermediate washers
and spacers are provided for this purpose.
In order to hold the yarn package carrier l2
at 3| on the bracket ID, the arm having a ?at
face against which the magnet 28 is clamped by
a cover plate 55 and a screw 56 passing there
circuit or phase still remains connected to the
?eld winding. As soon as the stop mechanism
70 or knock-011' mechanism is re-set, the two circuits
through and through the space between the arms
of the magnet into the rearward portion of said
arm 30. Also, the cover plate is provided with
a central boss that ?ts between the arms of the
magnet. The arm carries a pin 32 which ex 75
previously opened are closed again by the
spring 50.
It will be observed that in this machine the
magnetic gaps between the upper and the lower
sets of magnets are vertically disposed, within
2,411,126
the lateral limits of the machine base, instead
Important advantages of this invention are
of being located horizontally, as in the construc
tion shown in the application above referred to.
This arrangement is of advantage in reducing the
lateral over-all width of the entire machine very
in construction, can be manufactured more eco
reason that the supplemental carrier plate or cup
the ?ier revolves the yarn around said axis, a
that it provides a construction which is simpler
nomically, occupies less space, and is easier to
service and to operate.
substantially which, in turn, reduces the “gauge”
While I have herein shown and described a
of the machine, or, in other words, the necessary
preferred
embodiment of my invention, it will
distance between centers of spindles located in a
be evident that the invention may be embodied
line along one side of a twister frame.
Also, because the section of the yarn in which 10 in other forms without departing from the spirit
or scope thereof. Also, that the magnetic mech
the balloon is formed does not pass through the
anism for holding the carrier normally in a sta
magnetic gap, it is possible to reduce the width
tionary position, and the means associated there
of this gap and thus to produce a more e?icient
with for stopping the rotation of the spindle
operation of the magnetic apparatus. While
the ?ier 20 revolves in the plane of the magnetic 15 under emergency conditions, are also applicable
to spindles driven in other ways than by an elec
gap, the yarn is always under tension as it passes
tric motor as herein shown.
from the outlet l8 of the guide block 2| to the
Having thus described my invention, what I
eye of the ?ier, so that the width of gap required
desire to claim as new is:
merely to accommodate these parts is relatively
1. In a twister of the character described, the
narrow. In addition, the ?ier itself is made thin 20
combination of a spindle, an electric motor in
and ?at. As shown in Fig. 2, it is provided with
cluding‘a rotor associated with said spindle to
a balancing enlargement e opposite to the eye 1‘.
revolve the latter around its own axis, a normally
A further advantage of this arrangement of
stationary carrier for a yarn body, said carrier
magnets is that it permits modi?cations of the
being mounted for rotation around the axis of said
yarn package carrier necessary to support yarn
spindle, a ?ier secured to said spindle between
packages having a greater radius than that shown
said carrier and said motor, means for guiding
in Fig. 1. This frequently is highly desirable from
yarn drawn from said body to said ?ier, whereby
an operating standpoint. It is primarily for this
39, above referred to, is provided. As above 30 switch controlling the ?ow of current‘ to said
motor, a brake mechanism for stopping the rota
stated, this member is held in place by the two
tion of said spindle, means for normally holding
screws 29, but by removing them another carrier
said carrier in its stationary position including
plate, having a, greater radius, may be substituted
a magnet on said carrier and another magnet
' for it and secured in its operative position by the
replacement of the same screws 29. Such re 35 supported in a normally stationary position im
mediately below said carrier with the poles of the
moval of these screws does not disturb the other
parts in the carrier base because they are still
held in place by the screws 26—26.
As will be evident to those skilled in this art,
the yarn Y has one turn of twist put in it as it
travels from between the stationary plates of the
tension device I‘! to the outlet of the guide ‘M.
two magnets positioned to operate by mutual
attraction to maintain the carrier normally sta
tionary but to be relatively moved by the rotation
of the carrier out of said position into mutually
repelling relationship, and means operated by said
repelling action to actuate both said switch and
said brake to stop the rotation of said motor shaft
and said spindle.
2. In a twister of the character described, the
A second turn of twist is put into it between this
point and the wind-up mechanism with each rev
olution of the ?ier 20. The supply package i6 45
combination of a ‘spindle, an electric motor in
simply rests on a disk of felt 53 and is centered
cluding a rotor associated with said spindle to
by the tubular section l3 of the carrier. It is
revolve the latter around its own axis, a normally
enclosed in a removable cover 54 which protects
stationary carrier for a yarn body, said carrier
it from dust and the windage of the surrounding
being mounted for rotation around the axis of
balloon when the machine is in operation.
said spindle, a ?ier secured to said spindle be
For convenience in assembling and dis-assem
tween said carrier and said motor, means for
bling the parts, both the lower bearing 8 for the
guiding yarn drawn from said body to said ?ier,
‘motor shaft 3’ and also the brake drum are made
whereby the flier revolves the yarn around said
of a smaller radius than that of the armature
axis, a switch controlling the ?ow of current to
rotor 4. Consequently, by removing the screws
said motor, a brake mechanism for stopping the
d which secure the cap 42 to the frame 6, the
rotation of said spindle, means for normally hold
whole assembly of revolving parts, either with or
ing said carrier in its stationary position includ
without the carrier l2, may be lifted out of the
ing a magnet on said carrier and another magnet
frame for repair, servicing or replacement, and
the latter operation may be performed by a re 60 supported in a normally stationary position im
mediately below said carrier with the poles of the
versal of that just described. Because this ar
two magnets positioned to operate by mutual
rangement means that the socket for the lower
attraction to maintain the carrier normally sta—
bearing ,8 must permit the bearing holder to slide
tionary but to be relatively moved by the rotation
vertically into and out of it, a spring-pressed ball
51, Fig. 1, is provided to enter a vertical groove 65 of the carrier out of said position into mutually
repelling relationship, a pivoted arm supporting
formed in the outer surface of said holder where
it prevents rotation of the holder itself with the
bearing elements.
It may also be observed that the upper bearing
said normally stationary magnet for swinging
movement when so repelled, and connections for
transmitting motion from said arm to said switch
1 for the motor shaft sets into a circular recess 70 and said brake to open the switch and to set the
brake when said magnet is repelled.
in the cap 42 which is shouldered to limit the
3. In a twister of the character described, the
combination of a spindle, an electric motor in
bearing, and that a plate 58 is provided to clamp
cluding a rotor and a vertical shaft driven there
this race in place, the plate being secured to the
by, said spindle being associated with said shaft
cap 42 by screws.
75 for rotation around the common axis of said shaft
downward movement of ‘the outer race of the
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