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Патент USA US3076261

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Feb. 5, 1963
H. BARBER
3,076,251
YARN INSPECTION APPARATUS
Filed July 29, 1960
INVENTOR
HerberZ Barber
BY Wadi ?mxa.
TTORNEY
United States Patent 9 "PICC
3,076,251
1
2
3,076,251
Still another object of this invention is to provide a yarn
inspection device which automatically separates the mov
ing yarn from the inspection device in response to the
approach of a knot.
Other objects and advantages of this invention will be
come apparent as the following detailed description is read
YARN INSPECTION APPARATUS
vHerbert Barber, Pensacola, Fla., assignor, by mesne as
signments, to Monsanto Chemical Company, a corpo
_ ration of Delaware
'
n
Patented Feb. 5, 1963
Filed July 29, 1960, Ser. No. 46,288
8 Claims. (Cl. 28-64)
in conjunction with the accompanying drawing, in which:
The single FIGURE is a schematic view of a preferred
The present invention relates to yarn inspection appara‘
embodiment
of the invention showing the general arrange
tus and more particularly to yarn inspection apparatus
10 ment of the various elements.
permitting the passage of transfer knots therethrough.
Referring now to the drawing, there is'illustrated a
Generally, in the inspection of yarn, such as in the warp
preferred
embodiment of a yarn inspection apparatus
ing of tricot yarn, it is desirable to have 100 percent
comprising a standby bobbin 11 supplied with a yarn 12
inspection of the yarn with respect to broken ?laments,
having a head or leading end tied to the transfer tail or
slubs, loops, snarls or any other type of physical defects
end of a yarn 13 on a supply bobbin 16 by a transfer
producing a change in the yarn diameter. Hence, for
complete inspection of yarn it is quite desirable to allow
the ‘passage of transfer or tie-in knots beyond the yarn
inspection apparatus to thereby prevent snagging of the
knot and possible breakage of the yarn in the apparatus. 20
A transfer or tie-in knot is the knot made when a tail end
of yarn on one bobbin is tied to the supply end of yarn
on another bobbin.
'
'
or tie-in knot 17. This is a well-known arrangement.
The bobbins 11 and 16 are supported on a base, fragments
of which are shown supporting the various elements of
the apparatus and which are designated 18A, 18B, 18C,
and 18D.
The yarn from the supply bobbin 16 is passed through
a tension device 20 of a well-known type and to a cleaner
device 21 mounted on the base fragment 18B and, in turn,
It is well known that knots formed in the yarn should
through an eyelet of a swing arm 22 which may be pivoted
not be introduced, for example, into a constant tension 25 to raise the yarn out of the cleaner device 21.
.
yarn feeding mechanism or into a slub detection device,
The full stand-by bobbin 11 is provided to supplement
in order to eliminate the snagging or breakage of the yarn
the supply bobbin 16 whenever it becomes depleted. In
in going through these devices. However, present methods
this transfer operation, the yarn from the stand-by bob
of preventing knots from contacting yarn processing ap
bin is tied, either automatically or by manual means, to
paratus in a manner to cause yarn breakage are substan 30
the end ‘of the yarn 13 on the supply bobbin 16 by the
tially of the type where the knotted yarn is manually
transfer
or tie-in knot 17. Consequently, in the ?ow
brought through the apparatus before processing the yarn
of yarn from such a device as a frame holding a supply
through such devices, such as in a warping operation.
of yarn bobbins to the yarn processing or fabricating ma
In other types of yarn fabricating apparatus, after a knot
chine,
it is desirable to prevent the knot 17 from snagging
has been formed an appreciable amount of slack is pro
or
breaking
the yarn in its passage through the cleaner
vided therein so that by the time that the loop is drawn
device 21.
after knotting, the knot would have passed the portion of
The invention, as illustrated by the preferred embodi
‘ the apparatus which would have caused snagging or break
ment, prevents the transfer knot 17 from coming into con
ing of the yarn.
~
tact with the cleaner device 21, in response to a signal
Consequently, it would appear that presently used means 40 from a transfer indicator 24 to thereby prevent snagging
for preventing the passage of transfer or tie-in knots
‘or breaking of the yarn and maintain a continuous trans
through such apparatus as a yarn tensioning and slub
fer of yarn'from the creel.
snagging devices are either semiautomatically or manually
The transfer indicator 24 is provided with a movable
operative. These techniques 'do not permit economical
contact bar 25 pivotally mounted at one end on a pin
and mass production inspection of yarn, and introduce a 45 27 attached to the base and adapted to be moved by the
high degree of human error in such inspections. Accord
yarn into contact with a curved bar 26 attached to the
ingly,.it would be desirable in a complete mechanical
base. The yarn leading from the standby bobbin 11 to
inspection of yarn to reduce the number of ‘manual steps
the supply bobbin 16 is manually positioned behind the
and eliminate possible human error by having a com
movable contact bar 25 to pivot this bar into engagement
pletely automatic yarn inspection apparatus.
50 with the curved bar 26 when the yarn supply shifts from
The present invention in its preferred form comprises
the bobbin 16 to the standby bobbin 11. The contact
an automatic means of raising the yarn out of a cleaner
bar 25 and the curved bar 26 form a switch which de
or slub detector when a transfer or tie-in knot indicator
tects the shifting of the yarn feed from the bobbin 16 to
approaches the cleaner. The yarn is raised by a solenoid
the bobbin 11.
operated guide, the solenoid being temporarily energized 65. The tension device 20 provided between the bobbin 16
when the yarn supply shifts from one bobbin to‘ another.
and the cleaner device 21 may be any conventional design,
In this manner, a device is disclosed which offers complete
such as a multiple ?exible ?nger or a pulley and'friction
inspection of the yarn while allowing the passage of trans
type. In the pulley type, the yarn is wound about a ten
fer knots through the inspection apparatus, thereby elimi
sion pulley which is retarded by a suitable braking device,
nating yarn snagging or breakage which would otherwise
such 'as a friction drag pulley, or the like. However, for
be caused by the tie-in ‘knot.
the purposes of the present invention the tension. device
An object of this invention is to provide a novel and
is only schematically shown since the operation of the
improved device for inspecting yarn.
invention is independent of the particular tension means
“ Another-object of this invention is to provide a yarn
utilized. At any rate, the tension device 20 maintains a
‘inspection device which will snag and break the yarn when 65 predetermined tension on the yarn advanced from the
a slub or the like appears but which will allow the passage
creel to the particular machine or device the yarn is trans
of tie-in knots.
‘
mitted to.
A further object of the present invention is the provi
Cleaning means, such as the cleaner device 21, are pro‘
sion of a yarn inspector which will detect broken ?laments,
vided in ‘the apparatus adiacent to the tension device’20
slubs, and the like, which may produce a change in the 70 and may be of any suitable type for removing slubs or
yarn diameter, and which'inspector will still allow the
other physical defects present in the yarn transmitted
passage of transfer or ‘tie-in knots.
‘ therethrough, In the present invention, the cleaner de~
3,076,251
4
mounted on a platform 29 secured to the base fragment
so that operation of the transfer indicator 24 by the shift
ing of the yarn path will energize the solenoid 42 and
18B and provided with a guide pin 32 to provide a straight
feeding path for the yarn through the cleaner blades.
proaching the cleaner blades 28. If desired, the dashpot
vice is provided with a pair of cleaner blades 28 vertically
actuate the attached swing arm 22 when the knot is ap
45 may be predeterminedly varied in a well-known
manner to prevent the return of the arm 22 to its lower
opening 33 therebetween so that the yarn cleaning opera~
most position for any desired period of time to permit the
tion will be performed only in the lower or narrow por~
transfer knot 17 to travel from any point in its path of
tion of the opening. The lower or narrow portion of the
travel to the region beyond the cleaner blades 28. Hence,
opening 33 is of such a width that any slubs or other such
defects in the yarn will be caught and will cause the yarn 10 the spring 40 attached to the swing arm 22, in cooperation
with the dashpot 45, will gradually return the swing arm
to break. The upper portion of the opening 33 is such a
The cleaner blades are» formed with a trumpeted or ?ared C1
width that the knot 17 will pas-s therethrough.
Yarn moving means, such as the swing arm 22, is pro
vided adjacent the exit end of the cleaner blades 28, and
is provided with a yarn eyelet 34, through which the yarn
passes. The swing arm 22 is pivotally mounted on a pin
22 and its integral eyelet 34 to the position shown in the
drawing so that the yarn again passes between the lower
portions of the cleaner blades after the knot 17 has cleared
these blades.
It will be obvious that the yarn should be
removed from the cleaner blades only long enough to
ermit the movement of the transfer knot 17 beyond the
37 attached to the base. The are of the swing arm is pre
cleaner blades so that the cleaner blades may again be
determinedly adjusted so that the eyelet 34 in its lower
operative in inspecting the yarn for any physical defects.
most position directs the yarn between the narrow por
It should be understood, of course, that the foregoing
tion in the trumpeted or ?ared opening 33 between the 20
disclosure relates to only a preferred embodiment of the
cleaner blades 28 and above the cleaner blades in its high
invention and that it is intended to cover all changes and
position as shown in the drawing. A tension spring 40 is
modi?cations of the example of the invention herein
secured to the swing arm 22 and the base fragment 18D
chosen for the purposes of the disclosure, which do not
to bias and normally maintain the swing arm in its lower
most position and to return the arm to this position after 25 constitute departures from the spirit and scope of the in
vention as set forth in the appended claims.
it has been actuated to its high position.
What is claimed is:
A solenoid 42 is connected to the swing arm 22 through
1. A yarn inspection apparatus adapted to detect
a link 43 which physically connects the end of the swing
physical defects in a yarn which produce a change in the
arm with the solenoid 42. The other end of the solenoid
is suitably connected to a dashpot 45 of a well-knewn type 30 yarn diameter, comprising cleaner means having an open
ing for the yarn to move through along a path of travel,
attached to the armature of the solenoid to predeter
means adjacent to said cleaner means for displacing the
minedly set the speed at which the swing arm 22 returns
path of travel of the yarn out of said opening, means in
to its lowermost position. A battery 44 connected to the
the path of travel of the yarn at a position in advance of
solenoid 42 and the transfer indicator 24 serves to ener
said cleaner means for detecting the transfer of yarn feed
gize the solenoid when the shifting of the yarn feed from
from one bobbin to another, and means actuated by the
the bobbin 16 to the bobbin 11 moves the contact bar 25
detecting means for operating said displacing means.
into engagement with the curved bar 26, thereby elevat
2. In a yarn inspection apparatus having yarn supply
ing the swing arm 22 and raising the yarn out of the nar
ing means, detecting means for sensing a transfer of the
row portion and into the wide portion of the opening 33.
yarn feed path from one part of the supply means to an
In the operation of the preferred embodiment of the
other, cleaner means operatively associated with said
present invention, the yarn 13 leaves the supply bobbin
detecting means for removing any physical defects pro~
16 and passes through the tensioning device 20 and, in
ducing a change in the yarn diameter, and movable means
turn, between the cleaner blades 28 and through the eye
actuated by said detecting means for predeterminedly re
let 34 for complete yarn inspection. Defects in the yarn
moving the yarn from said cleaner means to prevent the
are caught in the lower or narrow portion of the trumpeted
passing of knots therethrough.
or ?ared opening 33 between the cleaner blades 28, which
3. A device for inspecting yarn, comprising a cleaner
either removes any loose matter on the yarn or causes
having an opening through which yarn to be inspected is
a break in the yarn if any non-removable physical defects
adapted to pass along a path of travel, means adjacent to
are present which changes the cross-sectional area of the
50 the cleaner for displacing the yarn laterally to its path of
yarn beyond a predetermined limit.
travel out of the opening in the cleaner, means engaging
After a break in the yarn, the absence of tension in the
yarn is noted by a suitable stop motion means of a well
the yarn for sensing a span of yarn extending from one
bobbin to another and having a knot therein, said sensing
means being positioned so as to sense said span before
20, which causes the cessation of the operation to allow
an operator to remedy the defect by removal thereof and 55 the knot reaches the cleaner, and means interconnected
between the sensing means and the displacing means and
to tie the yarn for continuation of the operation. Gen
actuated by the knot sensing means for operating the dis
erally, the absence of tension in the yarn actuates an elec
placing means.
tric contact in the tension device 20 which, for example,
4. A device for inspecting yarn, comprising a cleaner
?ashes a suitable signal for the operator, such as a light,
60 having an opening through which the yarn is adapted to
or the like, and also causes stoppage of the‘ apparatus.
pass, said opening having a narrow portion and a wide
After the yarn on the supply bobbin 16 is substantially
portion, a member movably positioned adjacent to the
exhausted, the yarn 12 from the standby bobbin 11 is
opening and having an aperture through which the yarn
tied by a transfer or tie-in knot 17 to the end of the supply
passes, said aperture normally being positioned in align
bobbin yarn 13 by suitable automatic or manual means
for continuation of the inspection.
65 ment with the narrow portion of the opening, means
adjacent to the cleaner for sensing a change in the yarn
When the yarn on the bobbin 16 is exhausted, the yarn
feed path from one bobbin to another, means connected
will feed from the standby bobbin 11, the yarn path then
to the movably positioned member for moving said mem
being directly from the bobbin 11 to the tension device 20.
her to align the aperture therein with the wide portion
When the yarn path shifts or transfers from the bobbin 16
to the bobbin 11, the yarn adjacent to the knot 17 will 70 of the opening, and means interconnecting the sensing
means and the movably positioned member for actuating
pivot the contact bar 25 into engagement with the curved
said member when said span is sensed.
bar 26. This completes the circuit to the solenoid 42,
5. A device for inspecting yarn, comprising a slub de
which pivots the arm 22 to lift the yarn out of the ?ared
tector having an opening through which yarn to be in
opening 33 before the knot reaches the cleaner device.
The preferred embodiment is predeterminedly designed 75 spected is adapted to pass, a member movably mounted
known type (not shown) inherent in the tension'device
3,076,251
adjacent to the slub detector and having an aperture
through which the yarn passes, a switch positioned ad
jacent to the slub detector in engagement with the yarn
in such a manner that a change in the yarn feed path
from one bobbin to another closes the switch, and means
interconnecting the switch and the movably mounted
member for moving said member to displace the yarn out
of said opening when said change closes the switch.
6
mounted on the base and having an opening through
which the yarn passes, said arm being movable to move
the yarn path into or out of the opening in the slub
detector, means for moving the arm to move the yarn
path out of the opening in the slub detector, and sensing
means actuated by a shift of the yarn feed from one
bobbin to another for vactuating the arm moving means.
8. A device for inspecting yarn, comprising a base, a
slub detector mounted on the base and having an open
6. A device for inspecting yarn, comprising a base, a
slub detector mounted on the base and having an opening 10 ing for the passage of a yarn, an arm movably mounted
through which the yarn is adapted to be passed, an arm
on the base and having an opening through which the
pivotally mounted on the base and having an aperture
yarn passes, said arm being movable to shift the yarn
through which the yarn passes, said aperture normally
path into or out of the opening in the slub detector, a
being aligned with the opening in the slub detector for
solenoid connected to the arm for moving said arm to
directing the yarn therethrough, a switch positioned ad 15 shift the path of the yarn out of the opening in the slub
jacent to the yarn and adapted to be closed in response to
detector, means attached to the arm for urging said arm
a transfer in the yarn feed from one bobbin to another,
toward an operative poistion to shift the yarn path into
a solenoid connected to the switch, a battery connected to
the opening in the slub detector, a dashpot connected to
the solenoid for energizing the solenoid when the switch
the solenoid for delaying the return of the arm to the
is closed, and a link interconnecting the solenoid and the 20 operative position thereof, and means actuated by a shift
arm for pivoting the arm to move the yarn out of the
of the yarn feed from one bobbin to another for en
ergizing the solenoid to move the arm.
opening when the switch is closed in response to said
transfer.
References Cited in the ?le of this patent
7. A device for inspecting yarn, comprising a base, a 25
slub detector mounted on the base and having an open
UNITED STATES PATENTS
ing through which a yarn is to pass, an arm movably
2,844,861
Strange et a1. ________ __. July 29', 1958
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