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Sept. 30, 1947.
2,428,313
T. HINDLE
HYDRAULIC OPERATING MEANS FOR LOOM SLAYS
Filed Aug. 6, 1945
5 Sheets-Sheet 1
NYENTOR
QLMM
ATTORNEYS
Sept. 30, 1947.
2,428,313
T. HINDLE
HYDRAULIC OPERATING MEANS FOR LOOM SLAYS
Filed Aug. 6, 1945
5 Sheets-Sheet 2
INVENTOR
mm
ATTORNEYS
Sept. 30, 1947.
2,428,313
T. HINDLE
HYDRAULIC OPERATING MEANS FOR LOOM SLAYS
Filed Aug. 6, 1945 ‘
5 Sheets-Sheet 3
A I
F.
a.
INVENTOR
on
ATTORNEYS
Sept. 30, 1947.
2,428,313
T. HlNDLE
HYDRAULIC OPERATING MEANS FOR LOOM SLAYS
Filed Aug. 6, 1945
5 Sheets-Sheet 4
NV E N O
TIA. RwM
0U
3M4
(km
ATTORNEYS
Sept. 30, 1947.
2,428,313
T. HINDLE
HYDRAULIC OPERATING MEANS FOR LOOM SLAYS
Filed Aug. 6, 1945
5 Sheets-Sheet 5
Em
ATTORNEYS *
Patented Sept. 30, 1947
2,428,313
UNITED STATES PATENT OFFICE
2,428,313
HYDRAULIC OPERATING MEANS FOR LOOM
SLAYS
Thomas Hindle, Blackburn, England
Application August 6, 1945, Serial No. 609,122
In Great Britain September 11, 1944
7 Claims.
1
This invention relates to looms for weaving
and has for its object to provide means for
actuating a loom slay hydraulically, for con
trolling its oscillating or reciprocating motion
during the weaving cycle, and for synchronising
the slay movement with the other essential loom
motions, such as those for shedding and picking.
The term "weaving cycle” herein refers to com
pletion of the essential operational sequence of
the loom and its component parts contingent
(Cl. 139-190)
2
ing the loom slay under the control of a single
cam fixed on a short timing shaft.
Fig. 7A is an end elevation showing the timing
shaft, single negative cam, cam follower and
rocking shaft for controlling the several hy
draulic cylinders in the modi?cation shown by
Figs. 1A, 6A and 7.
Referring to Figs. 1 and 2 the slay l is sup
ported by and securely attached to a number of
slay swords, 2, which are pivoted at their lower
upon the insertion of one pick of weft in the
ends on pins 3 carried in the loom structure.
woven cloth, assuming that one such pick of
The solid lines show the slay I and swords 2 in
weft is provided by one passage of the shuttle
their back positions, while the dotted lines show
across the loom.
their front positions, Ia and 2a respectively.
According to the invention the movement of 15
Each sword 2 is actuated by a connecting rod
the piston or pistons actuating the slay is con
or link 5 which is pivotally connected to the
trolled by a cam or cams on a continuously rotat
sword at a point 4 intermediate in its length,
ing timing shaft, the contour of such cam or
while at its rear end the connecting rod 5 is piv
cams being such that a dwell is given to the
otally connected to a crosshead 9 attached to
slay when in its rearmost position.
20 the rod 30 of a piston H), which is adapted to
The cam or cams also preferably have a con
tour such that it or they have a forward and
back displacement of a harmonic or substan
reciprocate in the ?uid pressure cylinder H.
The connecting rods 5 pass under the heald
frames, two of which are shown in their lowest
tially harmonic nature whereby the piston or
positions at 6.
pistons and the slay will have a movement closely 25
The fluid pressure cylinders II are mounted
synchronizing therewith.
on and attached to the loom structure at inter
The invention is illustrated in and‘will be de
vals across the width of the loom and each in
scribed with reference to the accompanying
alignment with the slay sword 2 it actuates. The
drawings in which—
cylinders are preferably mounted on the inside
Fig. l is a cross-section of a heavy loom show
faces of the loom end frames 8. and in a corre
ing one arrangement of the hydraulically ac
sponding manner on a number of intermediate
tuated slay under control of cams on a timing
frames 7, all of which extend to the front and
shaft.
back of the loom and support the front rest I2
Fig. 1A shows a modi?cation of the arrange
and back rest l3. In Fig. 2, the cylinders are
ment shown in Fig. 6.
35 omitted but the piston rods 3!! are shown at
Fig. 2 is a half-plan of a loom corresponding
tached to the crossheads 9.
to the arrangement shown in Fig. 1 including
As shown in Figs. 1 and 4 a ?oating lever M
a method of driving the timing shaft and cams.
is pivotally connected at its lower end to the
Fig. 3 is a plan of an alternative arrangement
crosshead 9 and its upper end I6 is pivotally con
of drive for the timing shaft.
40 nected to a link I‘! the other end of which is
Fig. 4 is a section (to a larger scale) of the
connected to the lower end of a lever I8 pivot
hydraulic cylinder, valve gear, positive cam and
ally mounted at l8b on the loom frame. The
timing shaft shown in Fig. 1.
lever I8 is adapted to be actuated by the cam
Fig. 5 is a similar view to Fig. 4 but shows the
I9 keyed to and revolving with the timing shaft
valve actuated jointly by a negative cam and 45 20.
either a spring or unbalanced ?uid pressure.
A piston valve 2|, which regulates the flow of
Fig. 6 is a part cross-section of a loom showing
fluid under pressure to and from both sides of the
the slay actuated by hydraulic cylinders located
piston II] in the cylinder H, is connected by the
under the front~rest of the loom, such cylinders
link 2|b to an intermediate point I5 01’ the ?oat
operating under control of cams on a timing 50 ing lever 14. Fluid under pressure, such as oil.
shaft.
enters the valve chamber at 22 and has continu
Fig. 6A shows a. modi?cation of the arrange
ous and free access to the central waist 2|c be
ment shown in Fig. 6.
tween the two collars 2N of the piston valve 2|.
Fig. 7 is a sectional-elevation of a loom show
These two collars, when the valve is in its sta
ing two of several hydraulic cylinders for actuat 55 bilized position as shown in Figs. 1 and 4, ex
2,428,313
3
4
actly cover the two ports 24, each of which com
municates with one end of cylinder II. If, how
ever, the valve be displaced slightly in either
direction from its stabilised position, the collars
sponding to completion of the forward movement
of the slay I.
Continued revolution of the timing shaft 20
then uncover the two ports 24 in such a manner
that pressure oil ?ows from 22 into one end of
and the cam I9 reverses the above forward
sequence, so that the piston I0 and sword 2 im
mediately commence and then complete their
backward stroke, which is followed by the period
cylinder Il, causing a corresponding displace
of dwell, prior to the next forward stroke.
ment of piston I0, while simultaneously oil is
‘By the use of cams-f9 having a forward and
displaced from‘ the other end of the cylinder and
is expelled through the exhaust connection 23.
10 backward displacement the nature of which is
harmonic or substantially so, the pistons and
The cam I9 shown in Figs. 1 and 4 is of the
connected slay are given a corresponding move
grooved type and a follower roller Illb mounted
ment, in veryelose vsynchronisation with the cam
on the follower lever I8 is located in the groove.
displacement.
The cam I9 is preferably constructed with a dwell
The cam or cams ?xed to and revolving with
extending over an angle of approximately 120 de 15
the ‘timing shaft 20, as shown in Figs. 1, 4 and 6
grees, that is between the follower roller posi
are of the positive type but alternatively, they
tions 26 and 21, Thus while the timing shaft
maybe of the negative type as shown in Fig. 5,
20 and the cam I9 revolve at a constant speed,
in which case the follower lever I8 may be under
the follower lever I8 remains stationary during
the angle of dwell during which period the pis 20 the joint control of the negative cam I9’ and
one or more return spring 29 adapted to main
ton valve remains in its central stabilized posi
tain the follower lever or its roller in contact
tion and the piston Ill likewise remains station
with the cam pro?le or alternatively, ?uid pres
ary in its rearmost position, so that no move
sure may be used for this purpose, as shown in
ment is imparted through the connecting rod 5
the lower part of Fig. 5. Here the collars of the
to the slay sword 2 and accordingly during this
piston valve 2| are of unequal diameter, arranged
period the slay I remains stationary in its rear
so that the unbalanced oil pressure acts to dis
most position.
place the valve in the direction appropriate to
This dwell of the slay coincides with the pas
maintain the follower lever or its roller in con
sage of the'shuttle across the loom, and enables
a larger shuttle to be used than would otherwise 30 tact with the cam. pro?le. ‘In Fig.5, the unbal
anced oil pressure creates a constant force act
be practicable with a given heald lift and a given
ing to move the valve 2I to the left, and through
slay sweep or movement or alternatively, if the
the connections I5 and I6 on the ?oating lever
shuttle size is not increased, or is not fully in
I4, and 25 on the follower lever I8, to maintain
creased, the heald lift and slay movement may
be reduced owing to the said dwell permitting 35 the latter in contact with the cam~ I9.
A modified arrangement of the invention is
satisfactory operation with a smaller shed than
shown in Fig. ‘6. In this arrangement the cyl
would otherwise be essential. When the con
inders II of the-pistons Ill operating the slay
tinued rotation of the timing shaft 20 carries the
swords 2 are ‘located under the front rest I2 of
point 26 of the cam I9 beyond the follower roller
the loom. In this modi?cation the piston rod 30
Iiib the latter together with the follower lever I8
is linked to the sword 2 at 4 by the connecting
is displaced by the cam, preferably with harmonic
rod or link '5. ‘The cylinders‘ II are mounted at
motion, until follower position 28 coincides with
an angle as shown to minimise the angularity of
the follower roller I9", the angular distance be
tween the points 26 and 28 being preferably 120°.
The commencement of the displacement of the
follower lever I8 from position 25 towards posi
tion 25?‘, causes a corresponding displacement
of the top end I6 of the floating lever I4, towards
position IEa. As at such time, the crosshead 9
is stationary, forming a stationary fulcrum for
the bottom end of the ?oating lever I4, the ini
tial movement of its top end I6 under the in?u
ence of the cam I9 causes the piston valve 2i to
be displaced slightly to the right of its central or
stabilized position. As an immediate result, pres
sure oil from 22 ?ows into the right end of the
cylinder II and acts to displace the piston I9 and
cross-head 9 (including the sword 2 and slay I
connected thereto) to the left. At the same time
oil is expelled from the left end of the cylinder
I I and leaves by exhaust connection 23 as already
described. In moving to the left, however, the
piston and cross-head carry the bottom end of
the ?oating lever I4 to the left, which movement
tends to return the piston valve to its central
stabilized position, but such stabilization is pre
vented by the continued displacement of the cam
follower lever which maintains the displacement
of the piston valve 2i, until upon completion of
the cam displacement (corresponding to roller
position 28) a further slight displacement of the
piston Ill and cross-head 9 carries the piston
valve 2I to its stabilized position when the move
ment of the piston to the left is arrested, corre
the connecting link L5.
'
The floating lever I4 is connected at its top
end to the sword at -4 and at the bottom end to
a link 3|, while the piston valve 2I is ?exibly
linked to an intermediate point I5 of the ?oat
ing lever. The link 3| extends backwards under
the heald frames 6 and is linked to the follower
lever l8, which is actuated by the cam I9 on the
timing shaft 20.
The ‘method of operation is exactly as already
described in respect to the arrangement of Fig. 1.
As the timing shaft 20 revolves at ‘a constant
speed, the follower lever I4 is displaced from 25
to 25a with harmonic motion during about one
thirdof the cam’s revolution, such displacement
providing the forward movement of the slay.
During the ‘next one-third revolution or there
abouts, the follower ilever I4 is displaced in a
similar manner but in ‘the opposite direction,
providing the backward movement of the slay.
For the remaining part ofthe revolution, the
cam has -a dwell which causes the follower lever,
together with the whole of the linkage to remain
stationary'with the-slay in its back position, and
the piston valve 2| in its central stabilized posi
t on.
As shown in Fig. 2, the timing shaft 20 extends
the full width of the loom, being carried in suit
able _bearings in the loom frames as indicated at
32. For each sword 2, a cam I9 is keyed to the
timing shaft 20 for actuation of the correspond
ing follower rlever I8 which is linked to the ?oat
2,426,813
ing lever 14 in the manner shown in greater de
may be adapted for continuous running and to
.drive the timing shaft 20 through a friction
clutch ll in combination with a friction brake
tail in Figs. 1, 4 and 6. All the cams I! are
identical in pro?le and therefore all the pistons
reciprocate in unison and all the slay-actuating
42, both clutch and brake being of comparatively
small capacity due to the small power required
to drive the timing shaft and its relatively small
points are equally effective.
A further modification of the invention is
shown in Figs. 7, ‘1A and 1A. In this arrange
kinetic energy. When starting up the timing
ment a rocking shaft 33 extends the full width
shaft, the brake is first released and the clutch
of the loom and is supported in bearings 35 pro
engaged, while conversely, to bring the timing
vided in the loom end-frames 8 and in any num 10 shaft quickly to rest, the clutch is ?rst disen
ber of intermediate frames 1. The follower lever
gaged and the brake applied.
I 8 (Figs. 7 and 7A) is keyed to the rocking shaft
In either case, prompt stoppage of the timing
33, which is accordingly oscillated by the cam I!’
shaft, which has comparatively little kinetic en
mounted on and revolving with the short timing
ergy, results in the slay being brought to rest
shaft 2|]. Also keyed to the rocking shaft 33 at 15 with equal promptitude, because when movement
suitable points along its length are a number of
of the follower levers I8 is arrested, the piston
drop levers 34 which convey the oscillatory move
valves 2| are at once carried to their central
ment of the shaft 33 derived from the cam ill
stabilized positions and the pistons III are like
to the several ?oating levers I4 of the slay actu—
wise brought instantly to rest by reason of the
ating pistons ill in the cylinders ll. Fig. 1A 20 011 being sealed off on each side of each piston.
shows one such drop lever 34 linked by an ad
Any tendency for the pistons to overrun is ef
justable link 35 to the top end of the ?oating
fectively resisted because such overrun would act
lever M. Fig. 6A shows this modi?cation in re
to displace the piston valves in such a manner as
spect to the arrangement otherwise shown in
would admit pressure oil to oppose the overrun
Fig. 6. The negative cam l9’ shown in Fig. 7A 25 of the pistons.
necessitates the use of one or both of the meth
While Fig. 1 shows rollers 50 at the back of the
ods shown by Fig. 5 to maintain the follower
loom for controlling warp yarn supplied from a
roller Illb in contact with the cam pro?le.
creel, and Fig. 6 shows the warp supplied from
In a further modi?cation of the invention a.
a beam 5|, it will be understood that either sys
single slay sword or a number of slay swords 30 tem of warp supply may be used in either modi
may be actuated by a single piston controlled by
?cation of slay actuation.
a cam on a continuously rotating timing shaft
The timing shaft 20 carrying the cam or cams
in any of the ways hereinbefore described.
l9 or I 9' for controlling the hydraulically ac
In any of the forms of the invention the tim
tuated slay, or another shaft positively geared
ing shaft 20 is required to transmit very little 35 to and running at the same speed as the timing
power since it merely actuates the piston valves
shaft, may be used to drive, actuate or control
2| controlling the flow of oil into and out of the
and thus coordinate mechanisms for operations
slay actuating cylinders II. The power for ac
tuating the slay is provided by the oil supplied
under pressure from an accumulator, conse
such as those for shedding, picking and the like.
40
quently the timing shaft may be driven by a
motor of very small power in comparison with
the power required to drive the loom and its
I claim:
1. Hydraulic means for actuating the slay of
a loom comprising the combination with the slay
and the slay swords to which it is affixed of a
hydraulic cylinder, a piston operating therein,
various parts. The speed at which the timing
a piston rod aiiixed to said piston and projecting
shaft is driven determines the operating speed 45 beyond one end of the cylinder a connecting rod
of the loom, which therefore can be made readily
pivotally connected at one end to a slay sword,
adjustable in any convenient manner, such as
and at the other end to the piston rod, a valve
variable ratio gear interposed in the drive be
controlling the supply of hydraulic ?uid to the
tween the motor and the timing shaft, the run
said cylinder, a timing shaft rotating at a con
ning speed of the motor itself may be varied. 50 stant speed and a cam affixed on said shaft op
When the timing shaft 20 is running, the slay is
erating the valve, the contour of said cam being
actuated as described but stoppage of the timing
such that a dwell is given to the slay when the
shaft brings the slay I to rest with the several
latter is in its rearmost position, the dwell co
piston-valves in their stabilized positions.
inciding with the passage of the shuttle across
The timing shaft may be driven as shown in 55 the slay.
Fig. 2 by means of a comparatively small motor
2. Hydraulic means for actuating the slay of
36 through any suitable form or reduction gear
a loom comprising the combination with the slay
ing 31, the output shaft of which is coupled to
and the slay swords to which it is ai?xed of a
the timing shaft 20 by coupling 38 or its equiva—
hydraulic cylinder, 9. piston operating therein, a
lent.
60 piston rod a?lxed to said piston and projecting
A starting switch 33 controls the starting and
beyond one end of the cylinder 9. connecting rod
stopping of the motor 36 and the switch may be
pivotally connected at one end to a slay sword,
operated by a rod 43 which is adapted to be ac
and at the other end to the piston rod, a valve
tuated either manually by the operator or auto
controlling the supply of hydraulic fluid to the
matically to stop the timing shaft 2|! and arrest 65 said cylinder, a timing shaft rotating at a con
the slay in abnormal circumstances. When
stant speed and a cam af?xed on said shaft op
thrown to the stopping position, either by hand
erating the valve, the contour of said cam being
or automatically, the switch 39 disconnects the
such that a dwell is given to the slay when the
motor from the mains and instantly reconnects
latter is in its rearmost position, the dwell co
it thereto but for the reverse direction of rota 70 inciding with the passage of the shuttle across
tion, so that the motor and timing shaft are
the slay, and that the forward and back displace~
brought to rest practically instantaneously, upon
ment of the cam is of a substantially harmonic
which the second switch 40 ?nally disconnects the
nature and the slay will have a movement closely
motor from the mains in known manner.
Alternatively, as shown in Fig. 3, the motor 36 76
synchronizing therewith.
3. Hydraulic means for actuating the slay oi’
‘h:
8.
a‘. loom“ comprising the combination» with» the
slay. and the slam swordsc tou'wl?oldiiti 191 a?ioledi
oil a plurality 0t: hydraulic‘ cylinders; ave-piston
rallty~ of connecting rods» each pivotally com
neotediatl one end to a; slay sword and‘ at the
otherend-to a piston rod, a series‘ of valves equal
opesatinglin» ealcla-cymmdergv aipi'siion rrotli attached -
in number to the number of cylinders; each valve
m,eacl;i_ piston and: projcctinge laéyondc the and! 5- controlling the supply‘ of hydraulic fluid to one
0B1 the cylinder" in which the; piston
a
cylinder, a- timing shaft rotating at a constant
plurality o?-connectings rodseeaeh picoilallyrcone
speed,» a plurality of cams affixed on the timing
nectedi at one
to.’ 21.813.311‘SW01’G21 andnat, 121w
shaft; each cam: controlling one of the valves;
otheli-endsto apiston rod; a, seriesio?iva-lwesl‘eeuali
the-contour of the said cams being such that
in- numberto theimimbemof calindnrsteanhwalvw 1ol dwelilistgiven to the slay when the latter is in
controlling the supply. o?rlzwdsaulic ?mdi to roost
itsar'earmost position. the dwell coinciding with
cylinder, a. timing: shait rotatimgxatz a-.~comstant
the passage'of the‘ shuttle across the slay and
speed=anci: a plurality oil‘ cams affixedbomthe
that the backward and forward movement of
timing: shaft; eachcam controlling onewo? the.
theicam is] of a substantially harmonic nature,
valves, the contour‘ o?etlire saiducams-ihelngpauch» 155a‘ plurality: or pivoted follower levers, each- oi‘
that aldwell is-egivenetoi-the slayewhenntllzel lattice"
whichvis oscillated by one of the aforesaid cams;
isiinq itslreanmost position, the; dmelidcoi‘ncielings
a pluralii'ryz of ?oating levers each of which is
with the passageo? thelshuttle acnossiitheslaye
DWOU?JiIY connected‘at-one end‘ to one of the
‘la Hydraulic-means: for» actuating‘ the} slay ‘oil,
piston: rods, aplurality of links each of which»
a loomJ comprisingthe comblnailionnwithethewlayi 2°:-_is~:pivotally, connected; at one end to a follower
and) the .slayi. swordsto whichs itcis *a?ixedeof': al .
lever and“; at the: other end to the opposite end‘
plimaljltyiof hydraulic-cylinders; alpismn'ioperams
of one‘of the floating levers to that to which the‘
ma,- i111: each cylinder; a, piston; rod saiztaohemi to.»
piston rodilisscon-nec'ted and. a plurality of links
each, piston. andcplgojectimg beyond; t?impcndalobr
one endgro? each'iof which is pivotally connected
the cylinder in which the piston openamsaa pin-,
to~.a valverandtthe- other end. to an- intermediate
rality of connecting.- rods each: pivoiiallyconneeted
point‘ omonel. of; the ?oating levers.
at;onc,-en<i-rho.a slam:swordeandraiirtbeuothen end;
'7,‘ Hydraulic means. for actuating the sla-y of”
to‘ a» piston rod; ayserries; of :values ozone; inmmm
a loom comprising the combination with the slay
beriyto the.:numbenofroylindecs, anthems sham ,
amd'the' slay swords to, which it is a?ixed'of a
rotating at at constant: speed: a iplintalitrysofl cams, ramplurality of‘ hydraulic cylinders. a piston operat
af?xed on the timing shaflngeaohlicamccontroliingi
ingin each cylinder, a piston rod attached to
on?iof; thelvalves, the con-tour ofs theisairiacams
each‘, piston: and: projecting beyond the end- of
being such, that a; dwelh is‘ given; lJ?rthBz-Sldg when,
the cylinder ‘in which, the piston operates, a plu
the-Jewel" is in; its rear-.InOst-mnsition, the; dwell:
rality of: connectinglrods each pivotally connected
coinciding with thepassage ofuthe shuntleacnoss =35 at one end’ to‘a slay sword and at the other end,
th§,s_l-ay,_and that the fonwandaan'dubank disnlacea
tone, pistonrod, a series of valves equal in! number'
mentuof- the cam, is of: arsiubstantiallmharmonm.
totthe number of' cylinders, each-valve controlling:v
nature andithe slay,‘ wj;l1.h?4‘l'.eiae'm?lleme'mmlns?ly ‘
synchronizing therewith.
;
the-supply: of- hydraulic ?uid to one cylinder, a
timing‘ shaft rotating at a constant ‘speed, a cam!
59 Hydraulic means rfori-actuaiinevthe-ssleu of 40 a?liied: on‘the timing shalt, a pivoted, follower‘
a loqmicorriorisingg the cembinaiipmwitlmherslay ‘
lever; oscillated by the‘ cam, a shaft receiving: a
and :the-slev: Swords to, whichritoia», a?ixecroi rat,
rockingimotion from the follower lever, a plu
plutaliirofg hydraulic {chimera-ammo ODE-Babe:
rality=of; arms, a?ixcdi on the rocking shaft; a
want each cylinder», a; vision a mdeattecheatq ,
Dluralitsi of'?oatingrlevers eaclrof which is pivot;
each, piston and projecting}beypndptlieqendnofr 45-, ally: connected at one end; to one of‘ the piston?
the. cylinder in which thozpiatnerommios. aiplw
rod‘sya plurality of linkseach of which is pivotally
ralltapf connecting:r0daeeohiiilvotallwcennoetem
connected atone end-to an‘ arm on the rocking‘
at (meendi to a slay, sword‘ endret, thevqihemnendv
to .al piston [rod-i :alserios' of! velaeae?llalsim number»:
shaft and'at the‘other end‘ to the-oppositeend
of onoV-of'the ?oating levers to that to which the‘
tome number of qvlindera- will valveicoetmllina -505v piston rod’: is connected and a plurality of links
thelsup la of; hydraulia?uidaio oneicrlindec: 3':
one end] of‘ eaoh‘of: which is: pivotally connected
to‘a' valveand'theother end to an intermediate
point on one of’ the’ ?oating levers, the contour
ralitv of, mm affixed- Im mawiminenshafkeactr
cam, controlling one of thewalveaf the-contour,»
of the (3311115011 the continuously rotating shaft"
of the said cams being such that a dwell is-gipenl 455, beingfsuchzthat a dwell is given to the follower
tirnioer?wit rotatinaat acmsbantsiqeedna; p131?‘
to._the slay whentthe, latterdsin its,~.r,earmost
position, the dwell coincidlngrwith ,the-passagaof;
lever- andv consequently to the slay when the
latter is in ‘its rearmos-t position and that the
forwarrland backward movement of: the follower
leverrlsof a substantially harmonic nature.
THOMAS HINDLE.
the shuttle, across theslamandthat the back»
ward I and, forward movement, oif,the,-§camvis;~o§=
a substantially, harmonic'rnammr a--pl_tu'aiity< of-v
pivoted ,follo-wler levers, eachoi-whichlia osaillahed
by oneof the aforesaidlcams andmeansconneotl
REFERENCES CITED’
ingv eachiollower, lever; to oneaQf. theivalves con-v
trolling thosupply of hydiaaulic ?uidtmthacylinrh
ders.
The following references are of record in the
65 file of this patent:
6. Hydraulic means for actuatingwtherslay ‘of
a loom comprlslngvthe combination,withmhefslay
and the slay swords to,which; it. is a?ixed of,
a plurality of hydraulic cylinders, a piston- op-
crating in each cylinder, amiston-rodlattached 70
to each piston and projecting beyondithesendrof
the cylinder in which the piston-operates; again-v
UNITED STATES PATENTS
Number
Name
Date
811,012,
924,142:
Wcissenborn ______ __ Jan. 30, 1906=
Burrows __________ __ June 8; 1909
1,790,335 ‘
Weissenborn ______ __ Jan. 27, 1931‘
2,054,150:
Watson __________ __ Sept‘ 15, 1936‘
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