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Патент USA US2118046

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May 24, 1938.
2,118,046
E. G. JEGGE ET AL.
UNIFORM TENSION LOOM FEEDER
Filed June 17, 1932
4 Sheets-Sheet 1
eff/warm
3%
341% (PM '
May 24, 1938.
2,118,046
E. e. JEGGE ET AL
UNIFORM TENSION LOOM FEEDER
Filed June 17, 1932
4 Sheets-Sheet 2
M
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QN
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“(ff/oral Biff,
May 24, 1938.
E. G. JEGGE ET AL‘
I
2,118,046
UNIFORM TENSION LOOM FEEDER
Filed June 1'7, 1952
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4 Sheets-Sheet 3
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May 24, 1938-
E. G. JEGGE ET AL I
2,118,046
> UNIFORM TENSION LOOM FEEDER
‘Filed June 1'7, 1932
4 Sheets-Sheet 4
Patented May 24, 1938
2,118,046
UNITED STATES PATENT OFFICE
2,118,046
UNIFORM-TENSION LOOM FEEDER
Emil G. Jegge, Montclair, and George W. Kretz
schmar, Gar?eld, N. J.
Application June 17, 1932, Serial No. 617,900
>
24 Claims.
(Cl. 139-110)
This invention relates to a Warp feeder or let
off mechanism for looms and more particularly
to a warp feeder mechanism which may be em—
5
ployed in connection with any form of loom and
which is automatically adjustable to provide uni
form tension of a predetermined amount through
out the warp, irrespective of ?uctuations or irreg
ularities in the operation of the loom.
It is an object of this invention to provide a
let-off mechanism which will maintain a uni
form and even tension on the warp threads dur
ing the operation of a loom for any given wind-up
or draw-off from the warp beam.
Another object of the invention is to provide
a warp feeder mechanism which is adapted to
respond to very slight variations which would
otherwise change the tension on the warp threads
and which will relieve tension on the warp when
the shed opens, thereby maintaining constant ten
sion. The warp-feeder mechanism should be so
sensitive that it reacts to the slightest variation
in the length of the threads due to the wind-up,
action of the harness and reed, or stretching of
the threads by immediately changing the rate of
25 let-off without varying the tension on the threads.
Another object of the invention is to provide a
let-off or Warp feeder mechanism which is su?i
ciently delicate in making adjustments auto
matically so as to provide uniform tension, so
CO C)
that with proper reed adjustment there will be
no starting marks or “barre” in even the most
delicate fabrics. By maintaining such a con
stant‘tension at all times on the warp threads the
goods will thereby be prevented from slipping
over thewind-up roll and will provide the exact
required number of picks per inch at all times.
Another object of the invention is to provide a
warp feeder mechanism which is constructed in
such a manner that While the warp threads are
passing through the loom onto the wind-up roll,
the operation of the loom may be stopped for a
very considerable period of time, at least for sev
eral hours, without making starting marks in the
fabric produced on the loom when the mechanism
is again put into operation. In other words, the
let-off mechanism of this invention is so sensitive
in operation that it will counteract any stretching
of the threadswhilc the loom is standing, thus
doing away with any starting marks.
Another object of the invention is to provide a
warp feeder mechanism which is adapted to be
readily set for any desired tension on the warp
threads at the beginning of a run and main-
tain this tension constant during the run, so that
55 during the operation of the loom there is no
necessity for manual adjustment of weights or
springs to maintain uniformoperation.
A further object is to provide a whip roll
mounting and support that is quick-acting and
free-?oating under tension to accurately control
the let-off.
These and other objects which will be‘ appar
ent from the subsequent description are all em
braced within the scope of this invention as set
forth in the appended claims.
10
Various attempts have been made in the prior
art to provide means for maintaining a constant
tension on the warp threads during a Weaving
operation and to compensate for the varying
diameter of a Warp beam duringa run, it having 15
been realized that it is impossible to employ a
constant rate of rotation of the warp beam dur
ing the let-off, in which the diameter of the warp
beam necessarily decreases. None of these prior
art devices have been wholly satisfactory com
mercially.
As operating the warp beam at a constant rate
of rotation during the run was found not to be
feasible, proposals were made to employ friction
devices including ropes, brakes, springs, etc., on
a free running warp beam but none of these pro 25
posed devices would give a constant tension on
the threads for the entire operation. If the
brake were set for a given tension with the
beam full, this tension would increase as the 30
diameter decreased due to the diminishing radius
of the threads while the effective radius of the
brake remained constant.
Various devices have also been proposed em
ploying positive let-offs with compensating mech
anism responsive to the varying diameter of the 35
warp beam. Some of these prior art devices are
controlled by the varying diameter of the warp
beam while others depend upon rollers, whip rolls
and other tension controls. In all of these de
vices, however, it has not been possible to secure 40
an absolutely uniform tension throughout the
weaving operation as the diameter of the warp
beam decreases.
In the present invention, a positive let-off has
been provided which is so sensitively controlled
that a constant tension on the warp threads is
maintained regardless of the diameter of the
warp beam or the'position of the whip roll which
varies with the length of the warp threads be
50
tween the lease rods and the warp beam.
The present device is extremely sensitive and
quick acting. Since a textile thread is very
elastic and will stretch at the slightest pull (of
wind-upj reed or harness action) any device used 55
2,118,046 7
2
Fig. 5 is an end view showing the let-off mech- .
to feed or hold back this thread must act in
stantaneously or else the threads will suffer and
this in turn will show in thread breakage or in
the weave.
Ch
,
r
In the present invention, by the arrangement
of parts, the ratio of the levers, the position of
the whip roll to the lever fulcrum, the use of ball
anismand whip roll support with its fulcrum in
section;
‘
>
_
Fig. 6 is a side view partly in section showing
the whip roll mounting and the fulcrum of the
whip roll arm in both of which anti-friction bear- 7
ings are employed, asindioated;
'
Fig. 7 is a sectional view of the link connecting
the pivoted lever bearing a weight, and the mem 10
has been created which is'so sensitive that the I b'er connecting therends of the whip roll support
slightest variation in the length of the vthreads arms;
Fig. 8 is a perspective view of the socket in
due to the wind-up, action of the harness and
reed, or stretching of the threads, reacts imme- : ~ which the whip roll supportarms are pivoted;
diately on the whip roll which in turn moves a
_ Fig. 9_is aperspective view showing the struc
weight‘ without increasing or altering the tene ture of the whip roll support arms at their piv 15
sion and changes the rate of rotation of the‘ warp o'ted‘ends;
beam to restore the whip'roll to its normal posi
Fig. 10 is a perspective view of the shaft which
tionrwithout at any time changing the tension forms the‘pivot;
Figs. 11 and 12 are diagrammatic views show
on the threads.
'
'
'
The loom feeder or let-off of the present inven
ing the path of the threads for varying positions 20
tion is capable of wide adjustment and operates of the whip roll; and
'
Fig.>13 is a section taken through the line
equally well on heavy or lighttension, high or
low pick jobs. rWhen‘woven on a loom fed‘ by 13-13 of Fig. -5 and shows the gearing which
this ‘let-off, the cloth is free from barreand is operates the warp beam.’
Referring in detail to the drawings, the let-off
smooth and uniform which‘is not possible with
bearings and machined surfaces, a mechanism
'10
rope or spring tension devices of the 'priorjart.
.25 When adjusted at the beginning of any weaving
operation a uniform tension throughout the warp
is maintained without any re-adjustment. Per
fe'ct joinin'gs'may'be‘made, .“starting marks” are
entirely eliminated, andll5 to '20%rless breakage
is} obtained, as compared with the use of the
ordinary warp feeders resulting in a correspond
ing increase in production. There is no in
creased strain on the warp ‘when the shed opens
or loom feederis mounted on frame members .I
provided for each end of the let-off. On the
outer face of each of these frame members 7| is
a T-shaped groove 2 for mounting the frame
members upon the loom structure designated as 30
3 in Fig. 2. Any other suitable sort of mounting
may, of course, be employed to fasten the frame
members ’I to the loom ‘supports 3 or the frame
members I maybe apart of'the loom frame-it
7
self.
The frame members I preferably have
35
roll support comprising pivoted arms extends to
sockets .20 at their upper ends into which extend
whip roll support arms 22. At the end of the
whiproll support arms22 are provided openings .
23 (Fig. 9) for shafts 24 and 24a. Figs. 8, 9 and
ward the-loom, withantifriction bearings pro
rvidedat .the .pivots. Awhip roll is mounted in
'10 taken together represent an exploded view of
the pivot construction. Whiproll support arm
the tension remains constant.
‘ 35 and
. The present invention is particularly designed
for'use'with' a positive let-off warp beam. A whip
anti-friction bearings on whip roll mountings to 22 (Fig. 9) is inserted into the socketj20 (Fig. 8)
have an effective position at a mid-point of the .after which the shaft 24a (or 24) is inserted
pivoted arms. To maintain a constant tension through the openings 20a in the socket and 23
on thethreads passing. over the w ‘p roll regard
in therwhip roll support arm. The shafts 24 are
less'of shedding Orpicking, apivoted lever sup
porting a weight is connected by an adjustable
link to a member extending between the ends of
the pivoted arms. The rate of let-off is con
‘trolled by an adjustable lever fastened in a ?xed
position with respect to the pivoted‘ arm of the
whip roll support and moveable with respect to
the same pivot. A pawl reciprocably operated by
‘a going part of the loom engages a ratchet for
rotating the warp beam. ' A pawl guard is oper
ated by the ‘lever which controls the position of
55 the guard and the number of teeth engaged by
the ‘pawl and determines the raterof rotation of
the warp beam.
1 In the accompanying drawings forming a part
mounted'in'ballbearings 26, (see Fig. 5), which
slide into openings Zila provided in the sides of
sockets 20. By this arrangement the whip roll
support arms 22 are free to move about the pivot
de?ned by the shaft 24 with a minimum amount _
of friction or resistance.
. The shaft 24. where it passes through whip
roll support 22 should make a tight sliding joint.
The shaft 24a must be keyed or otherwise non
vrotatably fastened to whip roll support arm 22w.
To secure this non-rotatable relationship a key
way 260 (Figs. 5 and 9) is formed in the shaft
and opening in whip roll support arm 22a respec
tively into which a key 26| (Fig. 10) is placed.
The shaft 24a, after passing through the roller (30
of this application and illustrating a preferred ' bearings 26 and whip roll support arm 22a, is en
embodiment of the invention, like numerals are larged as shown at 262. This enlarged portion
employed todesignate like parts throughout the
same.
.
.
'
“Fig. 1 is a side view in diagrammatic form
showing the preferred form ,of the let-off or warp
feeder mechanism of the present invention as
has longitudinal grooves
quently in connection with the positive let-off
control.
attached to a loom;
'
'
‘Fig. 2 is a view in perspective showing the 'pre-'
ferred form-of the entirelet-off mechanism in
70
detail;
'
V
'
r
Fig. 3 is a perspective View showing the whip
‘roll support and levers connecting to the weight
in this form of construction;
'
Fig. 4 is a side elevation of the whip roll and
275 positive let-off mechanism;
'
'
263 (Fig. 10) to form a
non-rotatable connection with a goose neck lever
30 the function of which will be described subse
7
.
v
The extent of the movement ofthe arms 22 is
limited by stops 4 provided on the frame mem
hers I to‘ determine downward movement and
extensions 28 provided on the whip roll support
arms 22 which when the whip roll support arms
22 are raised contact with the top of the’sockets
20; A whip roll 20!! is mountedon the whip roll
support arms 22 by means of mountings 202 pro
2,118,046
vided on each of the whip roll support arms 22.
These mountings 202 are arranged so that the
whip roll 200 has an effective position above the
3
action is overcome and forces applied to thewhip
roll do not tighten the fulcrum but it‘ is at all
pivot of the whip roll support arms 22 and be- , times free floating and therefore responsive to
small changes in the forces applied. The down
tween the pivot and the other end of the arm.
ward forces on the whip roll are communicated
The whip roll support arm 22, and whip roll
by means of the pivot on shafts 24 through the
mounting 202 may, if desired, take the form of whip
roll support arm
a bell crank lever.
22, connecting member I
The whip roll mountings 202 (Fig. 6) are pro
10 vided with openings 264 into which the whip roll
shaft 206 may slide. A recess 208 is provided in
the whip roll mounting 262 to contain ball bear
ings 2 iii. The whip roll 200 is thus free to rotate
on the ball bearings 2m and has an effective
15 position on a mid-point of the whip roll support
2I2 and link 228to the pivoted lever 240 holding
the weight 248.
>
.
~
Considered conversely, the force exerted by the
Weight 248 acts upon the pivoted lever 240 10
through the link 228 to pivoted whip roll sup
porting arms 22 which‘ carry the whip roll 200.
For any given: setting of the weight 248 a cor
The whip roll support arms 22 have a
responding force is applied by Whip roll 200 to the
downward obtuse bend about two-thirds of their
length from the pivot to place the connections
between them below the path of the threads and
20 avoid contacts with them. The non-pivoted end
threads passing over it to maintain a tension on
arms 22.
of the whip roll support arms 22 are joined by a
member 2 I 2. A practically rigid joint is obtained
by nuts 2M threaded to the member 2l2 and
tightened against both sides of each whip roll
25 support arm 22. Since the force applied to the
member M2 is at the ends and at the center, a
truss rod 2i6 is arranged between the ends of the
member 2l2. The truss rod M6 is anchored at
each end of the member 212 by means of anchors
30 2l8 provided with nuts and bolts 228 which pass
through the member 2l2. The truss rod between
the two anchors 2E8 passes over the groove 2E9
in the truss member 22| which is fastened around
the shaft as a bifurcated collar to provide room
35 between the bifurcations for a collar 222. The
truss member ZZI is held in position by set screws
224.
Pivotally mounted on the member 2l2 between
the bifurcated collar of truss member 22! is
them and this tension remains constant for any
and all positions of the whip roll between the two
extremities of its variable positions.
‘
It is thus apparent that any shortening of the
threads passing over the whip roll 200 tends to
raise the weight 248 and any lengthening of the
threads passing over the whip roll 200 lowers the
weight 248 and raises the whip‘ roll to maintain
at all times a constant uniform tension on the‘
threads. A more detailed description of the 0per-, 25
ation of this device and its effect on the rate of
let-off will be given later in connection with the
other parts of the machine.
At the end of one of the shafts 24 designated as 30
2411 .is provided an extension containing longi
tudinal surface grooves 263 or knurling. vMounted
on this extension of the shaft 2466 is a goose neck
lever 30. The goose neck lever is non-rotatably
mounted on the shaft 24a to-form a bell crank
lever with respect to whip roll support arms 22
and the longitudinal grooves thereon assist in
preventing any rotation. The opening in the
goose neck lever 30 is large enough to permit
collar 222 provided with a shouldered projection
. rotation on the knurled shaft 24a to make neces
226 (Fig. 7) to slidably engage a link or connect
ing pipe 228. Into the opposite end of the con
necting pipe 228 is inserted a threaded plug 230
provided with a shoulder 232 to limit the extent
to which the plug 280 can enter the member 228.
A threaded rod 234 passes through’ the threaded
plug 230 and is at the other end threaded into
bifurcated member 236 and held in position with
respect thereto by a lock nut 238, The length of
the link between the connecting member 2|2 and
a pivoted lever 240 may be adjusted by varying
the position of the plug 230 on the threaded rod
234. For normal operation the pivoted lever 240
should be set horizontal when the whip roll sup
port arms 22 are horizontal. The bifurcated
member 236 is attached to a pivoted lever 246 by
means of a pin 242. The pivoted lever 240 is
fulcrumed at 243 by a bifurcated member con
taining a pin 244 which passing through an open
ing in the pivoted lever 240 forms a fulcrum
therefor.
Pivoted lever 240 is provided for a considerable
part of its length with teeth 246 to hold in place
a weight 248 which acts through the pivoted
lever 240 to control the tension on the threads.
The operation of that part of the invention
thus far described is as follows: threads passing
over the whip roll 200 exert a downward force on
the whip roll which having an effective position
70 at a midpoint on support arms 22 exerts a down
ward force on the entire arm. Since the arm is
pivoted on shaft 24 and the force is applied near
the fulcrum there is a strong tendency for bind
ing at this point but by providing an anti-friction
75 mounting of ball or roller bearings this binding
’
sary adjustments. A slot 32 (Fig. 4) extending
to the opening for shaft 24a is provided in the
goose neck lever 30 at right angles to which a
nut and bolt assembly 34 passes. By means of
this nut and bolt assembly 34 the opening in the
45
slot 32 can be decreased and the connection be
tween the goose neck lever 30 and the shaft 24a
tightened.
‘
_
The goose neck lever 30 extends downwardly
around the shaft 36 and at its end below the
shaft 36 is provided with a- ?anged bolt 38 which 50
is adapted to slide within a slot 300 provided in
an extension of a pawl guard 362 Which is rotat
ably mounted on the shaft 36. Movements of the
goose neck lever vary the position of the pawl
55
guard 302. Also rotatably mounted on the shaft
36 is a pawl lever 304. The pawl lever 304 has
pivoted thereon by means of a bolt 306 a pawl
308. The pawl 388 is urged ‘against a ratchet
Wheel 3|0 by means of a spring 3l2 which is con
tained in a recess 344 in the pawl lever 304. The
pawl 363 is provided with a relatively sharp point
3l6 to engage the ratchet teeth 3i 8. Near the
point of the pawl 3H5, is an opening for axle 320
on which axle is mounted a wheel 322 to rotate on
ball bearings 324. The wheel 322 is arranged to 65
ride upon the pawl guard 302 and thereby lift the
point 3| 6 out of contact with the ratchet teeth
3H3 when the pawl guard is in certain positions.
The ratchet wheel 3I0 is keyed to the shaft 36 70
so that rotation imparted to the ratchet wheel
3| 0 will rotate the shaft 36. Also keyed to the
shaft 36 is a collar 326 which keeps the pawl lever
364 in position on the shaft against the ratchet
wheel 3|0. The collar is ?xed to the shaft by 75
4:
2,113,046:
V
is turned bypmeans of the-crank until the threads
passing‘ over the whip roll will'draw taut and
the whip roll'is-depressed until the mainv partof
the whip roll support arm~22 is substantially hori
a"rivet‘.321' and isprovided withprojections 328
to; engage with teeth in the collar of a crank 330.
The :crank 330 is rotatably mounted on the shaft
36 tojpermit manual operation. of vthe warp beam
when? necessary by engaging the collar 326 and
zontal as shown in Fig; 1.
With the whip roll
in this position the weight 248v is adjusted on piv-'
oted lever->240 by moving it'along the teeth 246.
is held on the shaft by means of a bolt 332 and
If a high tension is desired on the warp threads
washer.334.
.
'
_
,
.
, The ‘ratchet lever 304 is pivotally' connected
"with a rod 336 reciprocally operated‘ by a going
partiofjtheloom-thus causing a reciprocal motion
10 of the pawl which engages and rotates the ratchet.
Connection‘ between the reciprocating rod 336
and the pawl lever 304 issecured by a member
338' which surrounds the rod 336 and is held. in
position thereon by nuts 34 and 342. The mem
ber 338~is pivoted to the pawl lever 304 by means
of a'bolt 344.
I
.
.
7
Also mounted on the frame members I is a warp
beam 40._ At one end of'the'warp beam 40 'is
providedia worm gear 400. The worm gear 403
v20 is rotated by a worm 462'on a shaft 406 which
shaft is rotated by the" shaft 36 through bevel
gears 408. The gearing including the beveled
the'weight 248' is moved" toward the end of the
pivoted lever 240 away'from the fulcrum. If a 10
lower tension is desired the weight is moved to
ward the fulcrum. It should 7 be realized, of
course, that the size of the weight and its position
on the pivoted lever 240 can be varied within very
wide limits according to the tension desired upon 15
the threads.
-
'
V
'
‘ Figs. 11 and 12 illustrate the operation of the
whip roll in maintaining a uniform tension on
the threads at all times. When the loom is first ‘ 110
started after the adjustments above described the
whip ro-ll might be in the position indicated at
A in Fig. 11 and the threads between the warp
beam 40 and the lease rod 55 will have a length
equal to the distance along the path X—-Y—-Z.
Due to the weight 248 operating to keep the whip
roll in position against the warp threads, a ten
25 housing 42 which is held in place by bolts 44pass
ing through a ?ange 46 provided on one of the sion, dependingupon the size and position of the
weight, will be imposed upon the‘threads. After
frame members I.
.
To adjust the let-off the whip roll support arms the loom has operated the shedding, picking,
22' are-raised to their highest position when the . draw off, etc., will tend to shorten the distance 30
projections
'28'contact with the top of socket 20. between the warp beam 43 and the lease rod 50
30
as shown in Fig. 12. This will tend to cause the
. With the whip roll in this position as shown in
Fig. 4 the goose neck lever 30 is fastened to shaft whip roll .to assume/the position B in Fig. 12;
gears, worm and worm gears are covered by a
a
24a in arposition‘which permits about one eighth
inch clearance betweenzthe neck of the lever and
the spacer 3'! which separates therpawl guard
0: Cl
302 and the housing 42 on the shaft 36.
However, the tension on the threads will be ex
actly what it was at the time the whip roll was 35
This
adjustment when once madeis permanent and
need not be repeated. To adjust the feed the
lay sword 506 is opened to the position shown in
dotted lines on Fig. 1.
The goose neck lever is maintained in the po
'40
sition described in the preceding paragraph, that
is with a small amount of clearance between it
and the spacer 31 on the shaft 36 and with the
45
whip roll support at its upper extremity. The
length of the rod 336 between the pawl lever 304
and the lay sword 506 is then adjusted so that
the pawl 308 has its point 3“; almost to the end
of the pawl guard in the manner shown in Fig. 4.
Fig. 4 shows the position of the parts to complete
the adjustment if the lay sword which is con
nected to rod 336 is open.
,
~
' To operate the let-off in connection with a loom
a warp beam containing the warp threads wound
thereon is placed in position on the shaft 342‘: and
the warp threads are passed over the whip- roll
200 around lease rods 50 and 5| to the harness
52 continuing through the reed 53 and over the
lay 54. At this point they have been woven into
cloth and the cloth continues over the breast
60 beam 55 around the roller 56 to the draw off roll
51. Rollers 58 and 59 assist in keeping the cloth
in contact with the draw o? roll from which it
passes to the wind up roll 500. The draw off roll
operated by a’
65 51 is rotated by a pick wheel 502
pawl 504 set in motion by a going part of the
loom. The lay sword 506 is operated by a going
part’ of the loom such as a crank motion 508'
through a connecting rod 501.
When the let-off or loom feeder has been set as
70
75
in position A due to the weight operating on the‘
whip roll. It will therefore be evident that until
the whip roll has been so depressed that the whip
roll support arm 22 has contacted with the stop
4 (Fig. 4) the tension on the threads will always 40
remain constant. In operation, however, the’
whip roll support arm 22 would not come into
contact with the stop 4 because as the whip roll
is depressed it operates to increase the rate of
let-off.
_
V
r
;
‘
As shown in Fig. 4 when the whip roll support
arm 22 has been raised to its upper extremity
reciprocal movement of the rod 336 would cause
the pawl lever 304 to oscillate, but during these
oscillations the pawl 308. would not operate the ‘
ratchet 310 because the wheel 322 would ride
upon the pawl guard 32.
When the whip roll support arm 22 assumes a
horizontal position, as shown in Fig. 1, the goose
neck lever 30 is moved causing the pawl guard 55
302 to move back on the ratchet wheel 3|
and
permitting the pawl 308 to engage the teeth 318
of ratchet wheel 3"! for a portion of its stroke.
When the warp beam is full the whip roll sup 60
port arm 22 tends to assume a position slightly
‘above the horizontal and at each stroke’ of the
reciprocating rod 336 only a few teeth are then
engaged in the ratchet wheel 3I0.
As the warp beam decreases in diameter, it is 65
necessary for the ratchet 73|0 to rotate more
rapidly to allow a constant let-off. If the let
on is not su?iciently rapid the threads between
the warp beam and the lease rod 50 tend to short- 7
'en and in so doing depress the whip roll 200 and
above described and the threads arranged'in the
the whip roll support arm 22. When this occurs
the whip roll support arm 22 may be forced to a
manner indicated, the loom and loom feeder
position below the horizontal and accordingly
should be adjusted for ‘the particular work at
the goose neck lever 30 moves the pawl guard
hand.
farther back on the ratchetr3l0 permittingthe
'
The draw off rollis rotated or the warp beam
25
2,118,046
pawl 308 to engage more teeth on each stroke of
the reciprocating rod 336.
should be located may be readily determined in
view of 'the particular conditions or dimensions
of the particular device by anyone skilled in the
In this way the let-o? from the warp beam is
so controlled that regardless of the diameter of
warp beam, the amount of thread let oiT is
always su?icient to take care of that wound on
the draw off roll.
At all times during the operation the whip roll
is urged against the threads with a constant
art.
force, and, therefore, the tension on the threads
is constant throughout the weaving operation
regardless of the position of the whip roll between
the two extremities of its position.
It will be appreciated that due to shedding, lay
ing and picking, the whip roll support arm 22 may
be caused to vibrate rather rapidly within a
small distance but the average position during
these vibrations determines the rate of let off
and at all times the tension of the threads is
.10
mechanism this angle remains obtuse, so that
in the form of construction shown in the‘ draw
'
whip roll oscillates about its pivot in
15
constant.
Referring to the drawings, particularly Figs.
20
1 and 4, it will be
length of the whip roll arm to the whip roll sup
port arm 22, or weight arm about the pivot 24a, is
approximately one to three, which has been
found to give the smoothest and most rapid com
pensation in operation of the let-01f mechanism.
Referring more particularly to the drawings,
it will also be noted that the whip roll support
30 comprises a lever of the second class, preferably
25
accompanying claims.
We claim :
1. In a let-01f for a loom, the combination of a
positive let-off warp beam, a whip roll support
a bell crank lever, in which the arms of each
30
lever, comprising the short whip roll mounting
arm 202 and the longer whip roll support arm 22
thereof extend during operation of the let-01f
mechanism toward the loom
40
'
each other at a small angle, which in the pre
ferred embodiment of the invention as shown in
the drawings is an angle of about 45°.
It will be apparent from the drawings, refer
35
ring particularly to Figs. 1 and 2, that the whip
roll is preferably mounted on a bell crank lever
which is pivoted in such a position that oscilla
tion or movement of the whip roll is in substan
40
tially the median plane between the threads pass
45 ing to and from the whip. roll, or in other words,
the movement of the whip roll about the pivot
24, 24a of the arm is in substantially the plane of
the resultant of the forces of tension in the warp
50
45
threads.
It will be obvious, however, that oscillation or
movement of the whip roll is in an arc each point
of which, through the small arc of movement,
will coincide substantially with a corresponding
point on the line representing the resultant of
55 forces in the warp passing over the whip roll as
engaged by the pawl.
'
'
50
2. In a let-01f for a loom, the combination of a
positive let-off warp beam, a whip roll support
comprising pivoted arms extending toward the
determined substantially by the instantaneous bi
sector of the angle determined by the plane of the loom, anti-friction bearings at the pivots, a rigid 55
warp threads passing to the Whip roll and the member connecting the ends of the pivoted arms,
mounting having an effective position
plane of those passing from the whip roll.
60
It will be obvious that in a given construction
the position in which the whip roll and its sup
60
port should be pivoted may be readily determined
graphically, with a whip roll of given diameter,
by indicating the positions of the warp thread supporting a weight to maintain a constant ten
65 sections passing to and from the whip roll and
sion on the threads passing over the whip roll
bisecting the angle between the warp sections regardless of shedding or picking, an adjustable 65
passing to and from the whip roll, which bisector link connecting the rigid member between the
represents the plane of the resultant of the forces ends of the pivoted arms and said pivoted lever
of’ tension in the warp thread sections passing » at a point opposite the weight, and means respon
70 to and from‘ the whip roll. By drawing a line
sive to the position of the whip roll lever for con
from the center or axis of the whip roll at right trolling the rate of rotation of the Warp beam.
3. In a let-off mechanism for a loom, in com
angles to this resultant or bisector of the angle,
the line so drawn is the locus of points along bination with a warp beam, a pair of Whip roll
supporting arms, anti-friction bearing means for.
which the said pivot should be located. The par
.75 ticular point along this line at which the pivot pivoting the outer ends of said arms, a heavy
cross member rigidly connecting the inner ends
75
anaoec
6
of said arms, whip roll bearing meanson' said
supporting arms positioned ‘between the ends
thereof, thereby forming a lever of the second
class which the warp threads when shortened
5~ tendto force‘downwardly at the end carrying the
cross-member, a whip roll supported on said whip
porting arms thereby forming levers of the second
class, the said whip roll being so- positioned with
respect to the said pivots andrto the warp beam
thatv the threads passing from the warp beam
during operation pass over the whip roll forming
roll bearing means, and adjustable means en
gageable with said cross member substantially at
the middle thereof for exerting an upward force
an obtuse angle so that the whip roll oscillates
normally in a small are substantially coinciding
with the plane of the resultant of the tensions in
the warp threads or in other words substantially
in a" plane midway between the warp threads
7 10. for balancing the downward force exerted by the
cross member.
7
4. In a let-off mechanism for a loom, incom
bination with a warp beam, a pair of whip roll
passing to and from the whip roll, anti-friction
bearings for the ‘pivoted ends of said arms, means
rigidly connecting'the inner ends of the support
supporting arms, each pivoted at its outer‘ end in
15 anti¢friction bearings, the inner ends of the arms
being’ connected by a heavy rigid cross-member
ing arms and forming therewith a rigid frame
means engageable with said frame to counter
for forming with the arms a substantially rigid
whip-roll frame, a whip roll rotatably mounted
on said arms, and means for applying substan
the threads passing over the whip roll, means
operated by a going part of the loom for posi
20 'tially at the middle of said cross-member a con
' trollable-upward force for balancing the ‘said
tively rotating the warp beam and means re
sponsive to the position of the whip, roll for con
trolling the'rate of rotation.
frame, whereby a singlev force-applying means
controls said frame and applies a uniform tension
to the warp.
25 e
7
‘Y
a Warp beam, a whip roll, lever means for mount; .
tionary pivot so that during operation of. said 25
7
5. In a let-off mechanism for a loom, in com
arms being connected by a heavy rigid cross—
30 member for forming with the arms a substantially
rigid whip roll frame, a whip roll rotatably
mechanism the whip roll may oscillate in a plane
passing through the axis of the whip roll' and’
substantially midway between the warp threads
passing to and from the whip roll, whereby
counterbalancing forces operate to maintain or 30
mounted onsaid arms, andmeans comprising a
weight-controlled lever having an adjustable
weight thereon for applying substantially at the
35' middle of said- cross-member an upward force for
balancing the said frame, said weight controlled
lever being a lever of the ?rst class, having its
fulcrum supported at the base of the machine,
whereby a single adjustable weight means on the
40 power arm of said lever controls the whip roll
frame.’
6. In a let-off mechanism for a loom, in com
bination with the warp beam and its support, a
whip roll supporting frame comprising a pair of
arms, the outer end of each arm being rigid with
two stub shafts respectively, anti-friction bear
ings on which said stub‘shafts are journaled, a
ratchet controlling arm for the warp beam
ratchet. rigidly, secured on one of said stub shafts,
50 a heavy cross-member secured to the inner ends
of the saidrarms for completing a substantially
rigid whip-roll frame, and bearing means for the
whip-roll on said arms.
7'7. In a let-off mechanism for a loom, in com
bination with the warp beam and its support, a
55 whip-roll supporting frame comprising a pair of
arms, the outer end of each arm being rigid with
two stub shafts respectively, anti-friction bear
ings on which said stub shafts are journaled, a
ratchet controlling arm for the warp beam
ratchet rigidly secured on one of said stub shafts,
a heavy cross member secured to the inner ends
of the said arms for completing a substantially
rigid whip-roll frame, anti-friction bearing means
5. for the whip roll on said arms and means com
prising a weighted lever of the ?rst class opera
tively connected to‘ the middle of said cross‘mem
ber, whereby a single adjustable weight means is
used for balancing the whip-roll frame.
'
ing said whip roll for movement about a sta
supporting arms, each pivoted at itsouter end
in anti-friction bearings, the inner ends ofthe
' '
20'
9. A let-o? mechanism for a loom comprising
‘binationv with a warp beam, a pair of whip roll
4
15
balance it and maintain a uniform tension on
'
8. A let-off mechanism for a loom comprising
70
in- combination a warp beam, a whip roll support
including supporting arms pivoted above the warp
beam and extending toward the loom from their
pivots,"a whip roll supported by said arms be
'15‘v tween the pivots and the inner ends of the sup
shift the position of the whip roll in substantially
said plane with a turning moment about said
stationary pivot, anti-friction bearings at the said
stationary pivot serving to float the said whip
roll without appreciable friction, means con 35
nected to said lever means operating to shift the
position of the whip roll in response to changes
in the length’ of warp threads passing from the
whip roll, meansv for rotating the said Warp beam
and means operatively connected to the whip roll 40
to, control the rate of let-off from said warp
am.
10. A let-off mechanism for a loom comprising
a warp beam, a whip roll, lever means of the
second class for mounting said whip roll for move 45
ment about a. stationary pivot, said lever having
a whip'roll arm substantially one third of the
other arm, and so positioned that the whip roll
may oscillate in substantially the plane passing
midway between the angle formed by the warp 501..
threads passing to and from the whip roll, force
applying means connected’ to said other arm.‘
to maintain the whip roll in contact with the
warp threads to produce a predetermined ten
sion in the said threads, anti-friction bearings
at the saidstationary pivot serving to ?oat the
said whip roll without appreciable friction,
means for rotating the said warp beam and means
operatively connected to the whip roll to control
the rate of leteoff from said warp beam in ac
cordance with oscillating movements of the whip
roll.
'
II. In a let-off mechanism for a loom, the’
combination'of a warp beam, a whip roll mount
ing comprising a lever pivoted, at its fulcrum
in anti-friction bearings, a whip roll mounted
on ‘said lever in anti-friction bearings in a posi
tion so that during operation of the mechanism
the thread sections passing from the warp beam
to the whip‘ roll, and those passing from thence
tol'the loom make and maintain an obtuse‘ angle
at’ the whip roll whereby the resultant of the
forces ‘ofptension in the thread sections operates
directly on the whip roll in a direction to cause
a turning moment about the fulcrum without
2,118,046
substantial friction losses due to force or a com
ponent thereof acting on the pivot, means to
urge the whip roll against the warp threads with
a substantially constant force, means for rotating
or pull on the said pivot, ‘means for rotating the
said warp beam, and means operating with
changes in the position of the whip roll to con
trol the rate of let-01f from said warp beam.
15. A let-o? mechanism for a loom, comprising
a warp beam, a whip roll, lever means of the
second class for mounting said whip roll from a
the warp beam and means responsive to the po
sition of the whip roll for controlling the rate
of let-off from the warp beam.
12. In a let-oiT mechanism for a loom, the
combination of a warp beam, a pivoted whip roll
10 support having arms extending in the direction
stationary pivot or fulcrum, the said whip roll
of the loom, anti-friction bearings at the pivot
being so positioned with respect to its pivot that 10
in its normal position during operation a line
drawn from the axis of the whip roll at right
angles to the resultant ‘of the forces of tension
in the warp threads passing over the whip roll
would pass through said pivot, anti-friction bear 15
of said support, a whip roll mounted on one of
said arms of said whip roll support, force-apply
ing means operating on the other of said arms
15 so as to move the whip roll into successive posi—
tions to maintain uniform tension on the threads
passing over the whip roll regardless of variations
ings at the said stationary pivot, means operating
due to shedding or picking, said whip roll being
on said lever to shift the position of the whip roll
to maintain the tension on the warp threads con
stant during operation of the mechanism, means
for rotating the said warp beam and means op 20
mounted on the whip roll support in a position
intermediate between said pivot and said operat
ing means so as to maintain an angle substan
tially greater than a right angle between the
threads passing to and from the whip roll, said
pivot being positioned with respect to said whip
erated by oscillating movement of the whip roll
to control the let-oil’ from the warp beam.
16. A let-01f mechanism for a loom comprising
a warp beam, a whip roll, lever means for mount
ing said whip roll for movement about a station 25
25 roll during the operation of the mechanism so
as to cause oscillation of the whip roll in sub
stantially the median plane between the said
ary pivot including a whip roll arm and a sup
threads, or in other words in an arc substan
porting arm, said arms having respective lengths
tially tangent to the median of said angle, means
30 for rotating the said warp beam to permit let
o? of the warp threads and means operating
with changes in the position of the whip roll
for controlling the rotation of the warp beam.
13. In a let-off mechanism for a loom, the
35 combination of a warp beam, a whip roll, a piv
oted whip roll support, anti-friction bearings at
the pivot of said support, said support including
a bell crank lever having a relatively short whip
roll arm and a longer control arm, the bell crank
lever being mounted with the arms extending in
a direction toward the loom during operation,
with the whip roll arm diverging upwardly from
the other arm at a relatively small angle, the
length of the whip roll arm being substantially
45 one third that of the other arm, force applying
means connected to said other arm to maintain
constant tension on the threads passing over the
whip roll, the said whip roll being so mounted
with respect to said pivot and to the warp beam
50 that movement of the whip roll is in substantial
ly the median plane between the threads passing
to and from the whip roll thereby substantially
eliminating friction losses due to thrust or pull
on the said pivot, means for rotating the said
55 warp beam, and means operating with changes
in the position of the whip roll to control the
rate of let-off from said warp beam.
14. In a let-off mechanism for a loom, the
combination of a warp beam, a whip roll, a pivoted
60 whip roll support, anti-friction bearings at the
pivot of said support, the said whip roll being
mounted on said whip roll support by means of
a bell crank lever the arms of which are in a
one to three ratio and diverge from each other
at an angle of about 45°, the length of the whip
roll arm being substantially one third that of
the other arm, force applying means connected to
said other arm to maintain constant tension on
the threads passing over the whip roll, the said
whip roll being so mounted with respect to said
pivot and to the warp beam that movement of
the whip roll is in substantially the median plane
between the threads passing to and from the Whip
roll whereby movement about its pivot is in sub
75 stantially the plane of the resultant of the forces
7
of tension in the warp threads thereby substan
tially eliminating friction losses due to thrust
of substantially a one to three ratio, said lever
means being mounted so that during operation of
said mechanism the said whip roll may oscillate 30
substantially midway between the portions of the
warp threads passing to and from the whip roll,
anti-friction bearings at the said stationary pivot,
means connected to said
ating to shift the position of the whip roll in re 35
sponse to changes in the length of the Warp
threads passing over the whip roll, means for ro
tating the said warp beam and means operative
ly connected to the whip roll to control the rate
40
of let-oile from the said warp beam. '
17. A let-off mechanism for a loom comprising
a warp beam, a whip roll, a pivoted whip roll
support comprising a bell crank lever having a
relatively short whip roll arm, and a relatively
45
50
during operation of the let-off mechanism with
constant tension on the Warp threads passing
over the whip roll, the position of the whip roll
with respect to its pivot during operation being
such that the whip roll movement is in substan
'
55
median plane between the sections of
threads passing to and those passing
whip roll, means for rotating the warp
beam, and means operating with changes in the
position of the whip roll to control the rate of 60
let-off from said warp beam.
18. A let-off mechanism for a loom comprising
a warp beam, a whip roll, means for mounting
said whip roll for oscillating movement about a
stationary pivot, anti-friction bearings at said
stationary pivot, the said stationary pivot being
65
so positioned in the said mechanism with respect
to the warp beam and the warp threads passing
to and from the whip roll that the arc of oscilla
tion of the whip roll is substantially tangent to 70
the median plane between the warp threads pass
ing to and from the whip roll, force applying
means operating to shift the position of the whip
roll to maintain substantially constant tension on 75
£2,118,046’
8
the-warp» threads during operation of the mecha
nism, means for rotating the warp beamand
in the position of r
means operating with changes
_
the whip roll to control the rate of let-off ‘from
' said warp beam.
19. In- a let-off mechanism for a loom, the com
of a warp beam, a whip roll, means for
. bination
mounting the said whip .roll comprising a bell
crank lever the arms of which extend at an angle
of about 45° to each other, the length of the whip
roll arm being substantially. one third that of
the weight arm, the said whip roll being mounted
in a position so that movement of the whip roll
about its pivot is in substantially the plane of
the resultant of the tension in the warp threads
passing to and from the whip roll and weight
mounting the warp beam for rotation’ in fixed
position, a whip- roll, and means for mounting
the said whip roll for limited oscillation in pres
sure engagement with the threads passing from
the warp beam over‘ the whiplroll to the loom so
that the axis of the whip roll will move in substan
tially the plane of the bisector of the angle be
tween the threads passing to and from the whip
roll.
23. A let-off mechanism for a loom compris
ing a warp beam, awhip roll, anti-friction bear
ings for said whip roll, lever means of the second
class for mounting said whip roll- from a station
ary pivot or fulcrum, anti-friction bearings at
means for maintaining a substantially constant
pressure of the said Whip roll on the warp threads
passing thereover.
V
20. A let-off mechanism for a loom comprising
a warp beam, a whip roll, lever means for mount
ing said whip roll for movement about a station
ary pivot so as to oscillate in substantially the
medianv plane between
the warp threads passing .
to and from the whip roll, anti-friction bearings
the said stationary pivot, force-applying means
operating to maintain the position of the whip
roll in substantially the plane of the resultants
of the tension on the warp threads passing to and
from the whip roll, movement thereof being in a
direction to maintain substantially constant ten 20
sion on the warp threads during operation of said
mechanism, said force-applying means including
a lever ,member mounted’ on a stationary ful
crum and operatively connected to said lever
means to maintain the said whip roll in hori
25
zontal position during said operation, means for
rotating the warp beam and means operated by
at the said stationary pivot, means operating to
shift the position of the whip roll in‘ response to movements of the whip roll to control the let-off
changes in the length of the Warp threads to
said warp beam.
maintain substantially constant tension, means , from
24. In a let-off mechanismfor a loom the sub
for rotating the warp beam and means operating combination comprising a warp beam, means for
with changes in the position of the Whip roll_for ' mounting the warp beam for rotation in a ?xed
controlling the rate of rotation of the warp beam.
21. A let-o? mechanism for a loom comprising
a Warp beam, a whip roll, a draw off roll, lever
’ i means for mounting said whip roll for oscilla
tion from a stationary pivot in substantially the
plane of the resultant of the tensions in the warp
passing to and from the whip roll, means operat
ing to shift the position of the whip roll to com
~ pensate for changes in the length of the warp
threads passing to the draw off' roll, means for
rotating the warp beam and means responsive
to the position of the whip roll for controlling the 7
rate of rotation of the warp beam.
22. In a let-off mechanism for a loom the sub
combination comprising a warp' beam, means for
position, a whip roll, means for mounting the said
whip roll for limited oscillation in pressure en
gagement with the threads passing from the
35
warp beam over the whip roll to the loom so that
the axis of the whip roll will operate within a
limited space in a wide are substantially tangent
to the bisector of the angle between the threads
passing to the whip roll and those passing there 40
from and anti-friction bearing meansv for facili
tating movements of the said whip roll in both
its oscillating and turning movements.
EMIL G. JEGGE.
GEORGE W. KRETZSCHMAR.
45
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