close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2137252

код для вставки
Nov.’ 22, ‘1938! 4
F. J. STEVENS
'
2,137,252
' BOW STRAIGHTENING APPARATUS’
Filed- Aug; "12.v 1936
' ,
2 Sheets-Sheet 1
l'wpen?or
fit/((22%
Siwezzs
3
' 2,137,252
Patented Nov. 22, 1938
UMTED STATES2,137,252PATiENT-?i‘Fist
\
“v
now STRAIGHTENING ~A
Frank’J. Stevens, Providence,‘ R. III,‘ assignorj_t_o__ '
Cranston Print Works vCompany, Cranston,‘ '
. Application
R. 1., a. corporation‘
August 12,
of lthode'lsland"
1936, ,‘Sicrial Napalm
‘\
v 8 Claims.
(o1;"26;52f)f
~This invention‘relates to- bow straightening
line 4--4<»_of Figure 6,’ through the novel feeding
apparatus. Itiis'herein particularly shownv and
rolls;
described in‘ its application to a tentering‘ ma
1
--
>
-
1'
l,
.l
‘
_
Figure 6Pis~a»f-ront elevation taken as on line 5
chine but this is merely illustrative because it
cloth.
H
‘Figure. 5 is a plan view; and
5 may be used with any continuously moving strip
of
" ‘E
Figure; -4,.1_-is' a side-elevation, as in section on
6-6 of Figure 2.
v
~
‘
Y Referringgnow-gmore ‘particularly to the draw
i
In the weaving of fabric the» threads of the
ings andespecia'llyto Figure 1, it is highly desir
ablefor thetwoverr fabric to remain as indicated 10
at iii-with;v the-woofer ?lling threads B straight
woof, called ?lling threads, are laid or woven
straight across the warp and it is important
10 that they remain so ‘throughout the subsequent
across‘theiwarp threads C. Unfortunately this
desired.conditionds-seldom, realized and more
often‘ than not ;,the;woofj.threads become curved
processing of the goods. It is readily-appreci
ated that if these cross threads are laid straight
to form a desired pattern and" later become ’ as shown at Bland; atB2.
curved, called in the art “bowing”, serious and
15 damaging
deformity‘ of the pattern results.
Likewise with plain cloth which is to be printed
with some design, if the ?lling threads are not
straight across when the piece is printed it is
well-nigh ruinous to the design if straightening
go, of the bowing is later" attempted. ‘And even
' where the cloth is not woven or printed with any
?gurative design, being simply plain goods, itis
nevertheless highly desirable to have no bowing ,
not __only as a matter of appearance but because
\ when the goods are ?nally ‘cut to a pattern bow
" ing leads to unexpected distortion of therrcloth
when it is eventually made up ‘into a garment;
It is an object of this invention-to provide
means to straighten the bowing of the ?lling
30 threads. Cloth is Woven into long stripsgor pieces
As. previously stated
the presentinventionris,directed to the straight
ening. of suchbowing, Whether the ?lling threads
becurvcd asatBl ,. orreversely curved as at B2.
A tentering machine affords a most desirable
place in theprocessing of cloth for the employ
ment of my invention. In a tenter the ‘cloth is
stretched sidewise promptly after entering the
machinenandgthereafter travels a considerable
distance with theselvage engaged by the travel
ing clipsof-the machine. .The drawings show
the head or delivery end 101’ a tenter with my im
25
proved'lbow eliminating‘means applied thereto.
The head end ,comp-rises, side frame members I
andlcarrying a-main drive shaft 3 which may be
driven from any suitable source of power.
Splined to this shaft, and movable therealong,
arrebeveledypinions land 51. Each pinion meshes
which, during the‘ subsequent processing, ;_are with, a beveled lg'ear?, ‘I, attachedto the lower
temporarily stitched together so that the fabric end of a vertical shaft 8, 9, to the upper end of
may continue to be fed as a strip. inde?nitely.
which is secured a sprocket. gear in; II. Each
Generally speaking whenever such a continuous sprocket gear~drives an endless chain l2, l3 in 35
35 strip is being fed it is possible for the bowing to dicatedby the dotéand-dash lines in Figure 5.
occur, but it almost invariably occurs whilethe ‘This chain comprises aseries of clips I4, shown in
cloth is passing through a tentering'machine. Figure 6, those of one chain gripping one side. of
Accordingly ‘the present invention may be em
the cloth stripQAV while the. clips of the other
ployed particularly with a tentering machine, and chain grip . thev other side, of the strip. The 40
‘m such use is herein disclosed as the bestmode
chains ,extend for a considerable longitudinal
in which I have contemplated applying the prin
distance, being, guided, by chainrails l6, I‘! from
ciples of. my invention. ’ As previously noted,
this showing is to be taken as merely illustrative
for it is intended that the patent shall 'coverby
.57 suitable expression in the appended claims what
"
ever features of patentablenovelty exist in the
invention as a whole.
.
Figure 1 is a plan view, of several sections of a
strip of fabric, showing somewhat diagrammat
50
ically how the bowing may occur;
_
Figure 2 is a side elevation of the head or de
the cloth receiving end to the. delivery or head
end- of the tenter. Asa chain reaches its sprock
et gear the. clips are engaged by, an opening‘ ?ange 45
l8, l9 and causedv to open, therebypermitting the
cloth ito'tcovn'tinue forward 'asthe chain reverses
its direction of travel. The stretched cloth .
passes over .abar 20 to, a winder, (not shown)
50
where it is wound on itself into a roll.
All of the apparatus thus far described is old
livery end of tentering machine to which my de
in-vthe art and-is merely representative‘ of any
tenter, herein. disclosed as indicating broadly
vice has been applied;
anymeansv forhfeeding the .edges of a piece of
. ,
'
Figure 3 is a similar elevation of the same,
55 partly in section as on line 3-3 of Figure 6;
clcth_.;v Thenovelapparatus will now be described,
55
2
2,137,252
by means of which apparatus any bowing of the
?lling threads may be straightened and the cloth
delivered to the winder with these threads posi
tioned straight across the strip.
Secured to the side frames | and 2 are stand
ards 2| , 22 carrying an axle rod 23 to which is
secured arms 25, 26 between which is rotatably
supported a roll 21. These arms are so-positioned
on the rod 23 that the center of the roll 21 will
be substantially over the center line of the fabric
piece A, whose edges are indicated by dotted
lines a, a’ in Figure 5.
Beneath the cloth is
direction of the arrows, he turns hand-wheel 41
to raise shaft 48 and thereby depress the arms
4|, 25 and 26. This forces the upper roll 21
toward the lower roll 28 and where the non
cylindrical surface of the upper roll ?rmly presses
the cloth A which is between the rolls against
the lower roll, that portion of the cloth will as
sume the speed of travel of the surface of roll 28.
With the ?lling threads bowed as at Bl in
Figure 1, the variable speed device will be set so
that the roll 28 is traveling at a greater speed
than the cloth. In consequence, as the cloth is
gripped by the rolls the portion so gripped will
be speeded up and travel forward faster than
another roll 28 rotatably supported by arms 29,
30 on standards 3|, 32. The shaft 33 of this
15 lower roll 28 carries a sprocket gear 34 which is
connected by chain 35 to a variable speed control ‘ the edges of the strip. Because of the varying
device 36 of any suitable design which may, for diameter of the upper roll, the greatest pressure
example, be driven by another chain 31 running is exerted on the piece at its middle where the
diameter of the upper roll is largest and less
between gear 38 and a sprocket gear 39 on the
20
main drive shaft 3. Obviously the speed of chain pressure will be exerted progressively towards the
ends of the roll. This variation in pressure re 20
35, gear 34 and roll 28 may be di?erent from that sults
in variation in the speed imparted to the.
of gear 38 as determined by ‘the setting of the‘
variable speed controller 36. The hand-wheel 40 cloth by the rolls so that the middle portion 'of
the piece is speeded up to the greatest extent
is representative of any suitable means for de
25
termining the setting of the‘ device 36 and the
speed of roll 28.
7'
'
‘
-
At one end of the rod 23 is secured‘an arm 4|
30
which is connected by an extended link 42 with
a chain or cable 43 running through a housing
44 and around a guide wheel 45 to‘ a vertical shaft
46. The latter is provided with external threads
which are engaged by a hand-wheel nut 41 at
the upper end of a suitable support 48. By turn
, ing this hand-Wheel, shaft 46 may be raised or
lowered and, by means of chain 43 and link- 42,
the arm 4| may be turned.
This will cause the
axle rod 23 and arms 25, 26 to likewise turn and
either press roll 21 toward roll 28 or move the
rolls apart. Secured to arm 4| is a spring mem
ber 49 so arranged as to constantly urge arm 4|
upward, thus imposing a tension on the chain 43.
While it is to be understood that both roll 21
and 28 may be cylindrical rolls, I prefer that one
of them shall be non-cylindrical as shown. As
45 illustrated, roll 21 is not a true cylinder but has
its greatest diameter at the middle and its small
est diameters at the ends. Between these ex
tremes of diameter the variation may be gradual
and uniform in which case the longitudinal ele
50 ments of the roll surface are straight lines'from
the middle to each end. Or the surface may be
shaped so that the elements are curved lines,
either uniformly so or variably so with the curva
ture increasing toward the ends. As here shown,
55 the upper roll 21 has the longitudinal elements
of its surface, as straight lines while the lower
roll 28 is truly cylindrical, but these relations
might be reversed with the upper roll cylindrical
and the lower roll of varying diameter.
It is also preferable that one of the rolls 21, 28
have a surface which is somewhat yieldable so
that as the rolls are moved closer together the
extent of engagement of the cloth will be varied.
As here shown the upper roll21, represented as
65 being made of a suitable rubber composition, but
it might be provided merely with a surface cov
ering of such.’ material or other material of
yieldable nature.
.
‘
As the strip passes the bar 20 and becomes
70 visible to the operator standing beyond the
winder (not shown) in the neighborhood of the
while toward the ends of the rolls as the pressure
between them lessens the cloth is permitted grad 25
ually to slip so that its speed approaches the
speed of the edges. This leads to a complete
straightening of the bowing and restores the
WOOf threads straight across the warp.
If the bowing is in the reverse direction, as at 30
B2 in Figure 1, the speed of the roll 28 will be
adjusted to less than that of the cloth and as a
result the middle portion of the strip will be most
retarded with less retardation toward the ends
of the rolls. Again the bowing will be eliminated.
It is evident that if the bowing is not too great,
the necessary variation in speed to be imparted
by the rolls can be controlled almost entirely by
the hand-wheel 41, but if the bowing should be
unusually large, then it is desirable to change the
speed of the rolls by means of the variable speed
device 36. Such changes are readily-made by
the operator while the strip is continuing to
travel and as a result the cloth is presented to
the winder and wound up thereon with the bow
ing eliminated.
pressure roll it is to be understood that this roll
might also be positively driven, in which event
the lower roll could be a pressure roll or driven
as shown. Also, the lower roll might be arranged
to be moved toward or from the upper roll, but I
prefer the arrangement shown.
I claim:
1. Apparatus for eliminating bowing in a piece
of cloth comprising, in combination, feeding
55
means engaging the edges of said piece and capa
ble of positively moving each edge at a predeter
mined speed and means for simultaneously en
gaging the piece intermediate of its edges and
capable of positively moving said piece interme
diate of its edges at a speed different from that
of the said edges; the said piece being moved
in its own plane by the said engaging means.
2. Apparatus for eliminating bowing in a piece 65
of cloth comprising, in combination, feeding
means engaging the edges of said piece and ca
pable of positively moving each edge at a prede
termined speed and means for simultaneously
engaging the piece intermediate of its edges and
hand-wheel 41, he can readily determine wheth
capable of positively moving said piece interme
er or not any bowing is present in the cloth. If
he ?nds that the cross threads are curved as at
diate of its edges at a speed different from that
of the said edges; the said piece being moved in
75 Bl in Figure 1, and the cloth is moving in the
45
~
While I have shown the upper roll 21 as a
its own plane by the said engaging means so as
to impart the greatest difference in speed to
75
3
2,137,252
that portion of the piece where the bowing is
greatest and to impart less difference in speed
from said portion toward the edges of the piece.v '
3. Apparatus for eliminating bowing in a piece
of cloth comprising, in combination,, feeding
means engaging the edges of said piece and ca
pable of positively moving each edge at a prede
termined speed and means for simultaneously
feeding the piece intermediate of its edges at a
10 speed different from that of the said edges; the
last said means comprising a pair of rolls engag
ing the piece intermediate of its said edges.
4. Apparatus for eliminating bowing in a piece
of cloth comprising, in combination, feeding
15 means engaging the edges of said piece and ca
pable of positively moving each edge at a pre
determined speed and means for simultaneously
feeding the piece intermediate of its edges at a
speed different from that of the said edges; the
last said means including a cylindrical roll and
a non-cylindrical roll having its greatest diam
eter substantially at the center line of said piece;
one of said rolls having a yieldable surface and
there being means for moving said rolls relatively
to one another to engage the piece between them. 10'
'7. Apparatus for eliminating bowing in a piece
of cloth comprising, in combination, feeding
means engaging the edges of said piece and ca
pable of positively moving each edge at a pre
determined speed and means for simultaneously
feeding the piece intermediate of its edges at a
speed different from that of the said edges; the
lastsaid means comprising a'pair of rolls en
gaging the piece between them; and means for
changing the speed of said rolls to vary the rela 20
tive speed of said edges and the piece intermedi
pable of positively moving each edge at a pre
determined speed and means for simultaneously
feeding the piece intermediate of its edges at a
speed different from that of the said edges; the
20 last said means comprising a cylindrical roll and
a non-cylindrical roll constructed and arranged
its edges.
_
to engage the piece intermediate of its said edges. ate8. ofApparatus
for eliminating bowing in a piece
5. Apparatus for eliminating bowing in a piece
cloth comprising, in combination, feeding
of cloth comprising, in combination, feeding ‘of
means engaging the edges of said piece and capa 25'
ble of positively moving each edge at a prede
25 means engaging the edges of said piece and ca
pable of positively moving each edge at a prede
termined speed and means for simultaneously
termined speed and means for simultaneously ' feeding the piece intermediate of its edges at a
feeding the piece intermediate of its edges at a speed different from that of the said edges; the
speed different from that of the said edges; the last said means comprising a cylindrical roll and 30
30 last said means comprising a cylindrical roll and a non-cylindrical roll constructed and arranged
a non-cylindrical roll constructed and arranged to engage the piece intermediate of its said
to engage the piece intermediate of its said edges; the non-cylindrical roll being made of
edges; one of said rolls having a yieldable surface yieldable material; and means for moving said
and there being means to control the relation of non-cylindrical roll toward or from the other 35
35 said rolls to one another to vary the extent of roll to vary the extent of their engagement with
engagement of the piece between them.
6. Apparatus for eliminating bowing in a piece
of cloth comprising, in combination, feeding
means engaging the edges of said piece and ca
the piece.
'
FRANK J. STEVENS.
Документ
Категория
Без категории
Просмотров
0
Размер файла
588 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа