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Патент USA US3020631

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1785- 13, 1962
l. MOLEOD HILL
3,020,620
BOW STRAIGHTENING DEVICE
Filed NOV. 30, 1960
I
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INVENTOR:
IAN MCLEOD HILL
BY
ATTYS.
United States Patet
1
"" Ct?
3,020,620 ,
Patented Feb. 13, 1962
2
movement between the take-off and take-up mechanisms
3,026,620
BOW STRAIGHTENING DEVICE
Ian McLeod Hill, Lurgan, Donacloney, Northern Ire
land, assignor of one-half to John Dalgiish & Sons
Limited, Thorniiebank, Glasgow, Scotland, a British
company
Filed Nov. 30, 1969, Ser. No. 72,742
4 Claims. (Cl. 26—51.3)
and so disposed relative to said mechanisms as to provide
an outward path as indicated by arrow A from the take
off mechanism, and a return path as indicated by arrow
B to the take-up mechanism. The bow straightening de
vice provided at the locus of the change in direction of
fabric progressed between the take-off and take-up mecha
nisms comprises a transversely-disposed shaft 10 of sub
stantially greater length than the maximum width of fabric
This invention relates to a device for removing back 10 to be treated and two rollers 11 and 12 of equal length
mounted about said shaft and of aggregate length less
ward bow in the weft threads if woven fabrics or in
than that of the shaft 10 but greater than the maximum
width of fabric. The shaft 10 may be stationary and
the rollers 11 and 12 adapted to rotate relative to the
tively complicated in construction and operation.
15 shaft, but in the embodiment shown the shaft is mount
ed at each of its ends to rotate freely in bearings 13 and
An object of the present invention is to provide a rela
' 14 supported in a housing 15. The shaft 10 is formed
tively simple device for the purpose aforesaid.
with a longitudinal groove 'or keyway 16 extending over
According to the present invention I provide in or for
courses of knitted fabrics.
Devices for the purpose aforesaid heretofore have in
corporated bent bars and bent rollers and have been rela
apparatus including fabric take-off and take-up mecha
its entire length and each roller is formed along its in
nisms and means for progressing fabric in the direction 20 ner periphery 17 with a longitudinal rib or key 18 ex
tending over its entire length and which has a sliding
of its length between said mechanisms, a device for the
?t in the keyway 16. Thus the rollers 11 and 12 rotate
purpose aforesaid comprising a shaft disposed or adapted
with the shaft 10 when the latter rotates in its end bear
to be disposed transversely to the line of progress of the
ings 13 and 14, and can slide lengthwise of the shaft
fabric and in such relation to said mechanisms as to effect
a return bend in said line of progress, a pair of rollers 25 towards and away from one another.
The rollers are
hemispherical at their inner or directly opposing ends
mounted about said shaft and having an aggregate width
19, and at their outer or mutually remote ends 20 have
exceeding that of the fabric, and means for effecting lat
bobbin-shaped extensions comprising a median reduced
eral adjustment of said rollers along said shaft each to
diameter portion 21 ?anked by flanges 22. The ribs or
and from a median position relative to the fabric width,
the arrangement being such that if there is a backward 30 keys 18 extend through the extensions. The web W in its
progress contacts the roller peripheries and effects a re
bow in the fabric the rollers can be adjusted transversely
turn bend movement therearound, and in so doing ro
thereof each away from the median position to leave a
tates the rollers 11 and 12 and shaft 10.
gap therebetween whereby the center of the fabric travels
Any suitable known means may be provided for trans
through a shorter path than the remainder thereof in
movement through said return bend thus to remove the 35 verse adjustment of the rollers 11 and 12 along the shaft
10 each to and from the median position where they abut
how.
or substantially abut one another as shown in FIG. 3.
The shaft may be stationary or rotatable, but in either
In the embodiment of the invention illustrated (see par
case the rollers are rotatable.
ticularly FIG. 1) the means for effecting this transverse
The rollers may be adjusted lengthwise of the shaft by
any suitable means such as a right- and left-hand thread 40 adjustment of the rollers comprises a shaft 23 mounted
above and in spaced and parallel relation to the shaft 10
ed rod or shaft disposed parallel to and spaced from the
and rollers 11 and 12, the shaft 23 being externally screw
roller-mounting shaft and rotatable to displace therealong
threaded for some distance from near each end towards
towards and away from one another tapped tubes in
the center thereof. The threads ‘are of opposite hand,
threaded engagement with the opposite-handed threads
of the shaft and carrying arms terminating in yokes strad 45 that at the left-hand of the shaft as seen in FIG. 1 being
denoted 24 and being a left-hand thread and that at the
dling reduced diameter portions of said rollers adjacent
right-hand of the shaft as seen in FIG. 1 being denoted
the mutually remote ends of the latter.
25 and being a right-hand thread. Theshaft 23 is sup
An embodiment of the invention will now be described,
ported at its ends in bearings 26 and 27 and is freely
by way of example, with reference to the accompanying
50 rotatable, a hand-wheel 28 being secured on one end of
drawing in which:
the shaft for control of such rotation.
Mounted about each threaded portion of the shaft 23
and in screw-threaded engagement with the thread there
at is a short tapped tube 29 from which depends an arm
55 30 fashioned at its lower end as a yoke 31 received be
2—-2 of FIG. 1; and
tween the ?anges 22 and straddling the reduced diameter
FIGS. 3 and 4 are diagrammatic views indicating a web
portion 21 between the ?anges. It will be manifest that
of fabric passing to and from the device in conditions
if the handwheel 28 is rotated in a clockwise direction
respectively, where the fabric has no backward bow, and
the tubes 29 will move along the shaft 23 towards one
where it has a backward bow.
FIG. 1 is a front elevational view of a device for re
moving backward bow in the weft threads of woven fab
rics or in courses of knitted fabrics;
FIG. 2 is a schematic sectional view taken on the line
Webs of fabric may undergo various kinds of ?nishing
treatments and in such treatments it is usual for a web
another and the yokes 31 will simultaneously urge the
rollers 11 and 12 from the positions shown in full lines
in FIG. 1 towards the positions shown in chain-dotted
lines in FIG. 1 to bring the hemispherical ends 19 of the
of fabric to be progressed in the direction of its length
between fabric take-off and fabric take-up mechanisms,
rollers 11 and 12 into contact with one another and thus
driving means being provided for so progressing the fab
ric, which fabric take-off and fabric take-up mechanisms 65 in effect to form the equivalent of a single roller. Like
wise, counter-clockwise rotation of the hand-wheel 28
and driving means therefor may be of any preferred or
will move the rollers 11 and 12 away from one another
conventional construction forming no part of the present
leaving a gap therebetween.
In operation, if the weft threads of a web W of fabric
Referring now to the drawing, the device for remov 70 have a backward bow, as indicated diagrammatically at
33a in FIG. 4, the rollers 11 and 12 are adjusted away
ing backward bow in the weft threads of woven fabrics
from the median position along the shaft 10, thus to leave
or in courses of knitted fabrics is located in the path of
invention and, hence, are not shown in the accompanying
drawings.
3,020,620
“
i
4
3
a gap therebetween whereby the web of the fabric in its
return‘bend movement'travels ‘through a path'which be
comes increasingly shorter as the longitudinal center line
of the fabric is approached, the selvedges of the fabric
travelling about the peripheries of the rollers and the
web consequently being bowed in the transverse direction
as it effects said return bend movement.
As a result
the backward bow is corrected and the weft threads or
shaft each to and from a median position relative to the
fabric width, whereby if there is a backward bow in the
fabric the rollers can be adjusted transversely thereof each
away from the median position to leave a gap therebe
tween whereby the center of the fabric travels through
a shorter path than the remainder thereof in movement
through said return bend thus to remove the bow.
2. A device as claimed in claim 1, in which the rollers
are freely rotatable.
courses are straightened, as indicated diagrammatically
3. A device as claimed in claim 1, in which the shaft
at 33b in FIG. 4, when the web travels up to the direc 10
is freely rotatable and the rollers are keyed to the shaft
tion-changing roller 32. When there is no bow, as indi
for rotation therewith.
4. A device as claimed in claim 1, wherein said means
adjusted back to the median position to place them close
for effecting lateral adjustment of ‘said rollers along said
together and to provide in effect a single continuous roller.
Manifestly changes in details of construction can be 15 shaft comprises a right- and left-hand threaded rod dis
posed parallel to and spaced from the roller-mounting
effected without departing from the spirit and scope of
shaft, tapped tubes in threaded engagement with the op
the invention.
posite hand threads, said rod being rotatable to displace
I claim:
cated diagrammatically at 34 in FIG. 3, the rollers are
1. A device for removing backward bow in ‘the weft
therealong towards and away from one another said
threads of woven fabrics or in courses of knitted fabrics 20 tapped tubes, arms on said tubes terminating in yokes,
being progressed in a lengthwise direction, comprising a
shaft disposed transversely to the line of progress of the
fabric to effect a return bend in said line of progress,
a pair of rollers mounted on said shaft and having an
aggregate Width exceeding that of the fabric, and means
for e?ecting lateral adjustment of said rollers along said
said rollers having reduced diameter portions adjacent
the mutually remote ends thereof, said yokes straddling
said reduced diameter ‘portions.
No references cited.
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