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NSV@ 5, i946.
Filed July 14, 1945
5 _sheets-sheet 1
Nav, 5, i946.
Filed July 14, 1945
5 SheetS-Shéet 2
Nav. 5, 1946. '
Filed July 14, 1945
5 Sheets-Sheet 5
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Nov. 5, 1946.'
Filed July 14, 1945
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Nov. 5, 1946.
Fiied July 14, 1945
Patented Nov. 5, 194$
John Edward Lynam, Mapperley, England, as
signor to William Cotton Limited, Loughbor
ough, England, _a companyl
Application July 14, 1945, _Serial No. 605,115
In Great Britain February _5, 1945
In straight bar knitting machines it is cus
The coupling preferably comprises a housing,
tomary to drive the yarn carrier or each of them
a rod extending through it, >a split taper collet
through the medium of ka permanent friction
encircling the rod within the housing and co
coupling, known as a friction box or friction,
operating with a taper surface, and a piston in
which provides sufficient frictional grip to drive Ul 4the housing for operating the collet. It is further
the carrier to and fro Ibut slips when the traverse
preferred that there shall. be two opposed pistons
of the carrier in- either direction is terminated
each operating a collet.
by a stop. Thus in a common construction of
The foregoing and other features of the inven
Cotton’s Patent machine there is a friction rod
tion set out in the appended claims are incorpo
which is reciprocated with a constant ampli 10 rated inthe construction which will Anow be de
tude by .a draw cam and extends through at least
scribed, as an example of the application4 of the>
one friction box which contains a frictional sur
invention to the alternate dri-ving and locking
\ face permanentlypressed.against theirod to grip
of a carrier drivingr bar whichk is connected to
it and which is connected to'a carrier rod (or
a ‘carrier or capable of beingY mounted to any
any selectedone of several’carrier‘rodsh' The
selected one of a plurality ofrcarrîers, with ref
known arrangement readily permits the traverse
erence to the accompanying drawings in which
of the carrier to be Varied (by adjusting the
Figure lis a part-section through a coupling.
stops) as required but since the friction is ap
Figure 2 is a cross section illustrating the use
plied throughout the whole time that a given v of such a coupling for driving a reciprocatable
carrier is operative it vhas various recognized dis 20 rod and
advantages among which may be mentioned the
Figure 3. is a like View illustrating its use for
heavy impact when the carrier rod strikes a stop,
holding the rod stationary;
the power absorbed in forcing the friction rod
Figure 4 is a cross section showing thev relevant
through the box after said impact, and the heav
parts of a Cotton’s Patent or other straight bar
ily-fluctuating load thus thrown upon 'the driv N.) Ul knitting machine and illustrating the application
ing motor of the machine. A speciñc object of
of the coupling thereto;
the present invention isA a construction which
Figure 5. is a rear elevation of this machine;
avoids or minimises these disadvantages. An
other object is a ñuid-operated friction coupling
Figure 6 is an elevation, Figure '7 across sec
(i. e. a hydraulic or pneumatic clutch or brake) 30 tion, and Figure 8 a plan (all cna larger scale)
for a reciprocatable member of a Cotton’s rPat
of certain details of this machine.
ent or other straight bar knitting machine.
The coupling employed in this example is indi.
The invention provides `in a knitting machine,v
cated generally at I in Fig. 1 and consists of a
particularly a straight bar knitting machine; the
hollow housing 2 through which the carrier driv
combinationwith a member movable to and fro,
bar 3, 'of circularcross section, extends slid
of a coupling comprising two relatively-movable
ably. The housing interior terminatesv in two,
parts one of which is connectable to said mem
oppositely directed, slow tapers 4 each of which
ber, a friction member for Yconnecting them fric
accommodatesv a split taper collet or gripper 5
tionally, and fluid-operated means for operating
encircling the bar 3 so that if these collets are
said friction member.V The coupling may serve to 40 forcedl outwards they will wedge into the tapers.
drive a reciprocatable member, or to hold it sta
and so will grip the bar and couple it frictionally
tionary, or there may be a coupling for each pur
to the housing.> They are operated by fluid
pose. Specifically, thesaid member may be a
pressure means and for this lpurpose each> collet'
yarn carrier or carrier »rod and as viewed from
an important aspect the invention provides `in
a Cotton’s Patent or other straight 'bar knitting
machine having at least one carrier movable
to and fro with a variable amplitude and a re
ciprocatable driver -for driving it, a driving cou
pling comprising two relatively-reciprocatable
parts whereof one is connectable to the carrier
and the other to the driver, a >friction member
5 is attached to or integral with a piston 6 eni
circling the «bar V3, these two pistons 6. are slid
able-on` the bar and in' the housing. and one of.
them has a boss 1 vslidably received in a sleeve
8 projecting from the inner face of `the other.
To force the pist'onslî apart as in a cyli-nder'and
to cause the coupling to lock, air, oil, or` other
fluid under pressure is admitted through a union
9 in the housing 2`to the annular cavity l0, be
for connecting them, and fluid-operated> means
tween-them, surroundingthe sleeve 8. They are
for> operating -said «friction member »in> accordance
moved towards. eachother, .to withdraw. the col:
with~ the desired amplitude of travel.V
55 lets 5 and to free> theA coupling, conveniently by
spring-pressed plungers II located in the walls
of the housing, or they may be positively actuated
by other convenient means. The ñuid pressure
is controlled by valve apparatus indicated gen
erally at I2 in Fig. l (details of which are shown
in Figs. '2 ‘and 3).. *`
The application ofrsuch a, coupling to a Cot
ton’s Patent or other straight bar knitting ma
chine is illustrated in Figs. 4 and 5 which show î
needles I3, sinkers I4, jacks l5, slur cock I6, slur
bar I1 and a. sliding bar I8 reciprocated by the
draw mechanism I9 having a draw lever 20 and
valve plunger I2a to a driving position, by either'
of two operating plungers 34, 35 slidable in blocks
36, 31 (which are slidable along frame member
23 and are connected to the end stops 24 by rods
38, 38 so that their spacing is adjusted as the
stops 'are adjusted). . These plungers are ar
ranged to engage and lift a.l horizontal rod 48
connected to the rock shaft 30 by arms 4I and
at their lower ends respectively carry trucks 42,
43 for engagement by cams 44, 45 on the tie bar
or like partV I8 that reciprocates with a constant
amplitude.V These cams and trucks are oñset,
draw cam 2l, main cam shaft .22, astationary ' ' so that either truck is located in the track of
longitudinal frame member 23, and’ stops 24 ad- » ` one cam onlyd'as will readily be appreciated from
justable by stop screws 25 in the customary man
ner, carriers 25, and carrier rods’21ycaprable rlof-~ _ l»
being selectively coupled by known Ameans 28- A
to a driving block 29 which is slidable along the
frame member 23 and is connected to the driving
bar 3. Two of the couplings I are employed, a 20
driving coupling Ia for driving the carrier driv
ingîebar 3 and a lockingcoupling Ib for locking
it ina stationary position. '
~ The housing 2 of the driving coupling ia is
mounted on a bar (such for example as the slid
ing bar) I8 which is reciprocated with a con
stant amplitude by the drawY cam 2l of the ma
chine; the housing of the locking coupling Ib
is -mounted on the. frame member 23, and change
over control valve apparatus is provided for ad
mitting fluid pressure to either coupling while
simultaneously opening. thev other to exhaust.
Thus at the same time that pressure is applied
to thedrivingcoupling I a to cause it to >connect
thei carrier rdriving bar 3 .to the reciprocating
bar ¿|8, .the locking coupling VIb is opened to eX->
haust and releases the driving bar 3, and at the
same» time kthat thedriving coupling Ia is con
nected tol exhaust and ceases to drive the ydriv
ing bar 3 pressure is applied to the locking cou
pling Ib which therefore holds the drivingbar
3 stationary by locking it to frame member 23.
:For each coupling, the valve apparatus I2 con
sists Vo'f’a single plunger having a plurality of
collars' whereby- the coupling may be connected
to a pressure supply 9.or >exhaust 9'. If the
pressure 'fluid is air, the exhausts can emit di
rect to atmosphere, but if it is a liquid such as
oilv they are.desirably connected by .piping Lto
Figs. '1 and 8, and each truck is capable of being
shifted axially against the pressure of a spring
f46`~ or 4_1`byfan incline 44' or 45' at the outer end
of itswcam. This arrangement is such that in
movement of the tie bar or the like I8 from left
to right the left hand cam 44 rises the left hand
plunger 34 and towards the endl of this move
ment the right ,hand ca1n=45 >displaces the truck
43 of the right hand plunger 35 without lifting
the latter; in movement from right to left the
right hand cam 45 lifts the right hand plunger
35 and towards the end of this lmovement the
left hand cam_44 displaces the'truck 42 of the
left; handY plunger 434 without lifting thelatter.
Since, when the plunger`34, 35 andthe valve
plungers I2a, I2b are raised the valve apparatus
admits fluid pressure to the driving> coupling Ia
and connects the locking coupling lb to exhaust,
this ensures that irrespective ,of the >adjustment
of the stops 24 and of the length of» draw.- the
_ carrier 26> moves with ,av definite «lead over the
slurcock »gl-3i which lead is governed bythe po
sitioning of the ¿two-cams 44,v 45 (andthese may
be adjustable on the tie bar). Each cam is com
paratively short, and only holds up its plunger
~ fora short'iwhile.
Therefore a latch is provided
for retaining the aforesaid> rod 40 inthe raised
position, together with means for tripping the
latch to release, the'rod when the carrier rod 21
strikes a stop 2,4 so that the valve plungers I2a,
I2b then moveto the locking position. The latch
consistsV ,of> an arm 48 pivoted at 49 on a ñxed
part 58; it pis connected by'pins 5I to a hori
zontallyslidable trip bar 52 which is spring biassed
to a central position in which the end 48' of latch
a sump. The respective valve plungers are in 50 arm 48 ñtsj under one (4I') of thelevers sup
porting> the horizontal‘rod 4U ‘so that assoon as
dicated at I2a. and I2b in Figs. 2 and 3 and it Will
one of the plungers34, 35 raisessaid rod 40 the
be seen that when they are both raised the driv
latch arm 48 moves into position and holds it up.
ing ‘coupling Ia is connected to the pressure sup
each end, Anear the adjustable blocks 36„ 31
ply-land` the locking coupling Ib to exhaust and
carrying the'operating plungers 34, 35 the trip
when they areboth lowered the driving coupling
bar 52 has a rack of ratchet teeth 53, 54 the two
is connected to exhaust and the locking coupling
racks being oppositely directed, and on each block
to the pressure supply. This valve apparatus is
36,V 31 there Visa short lever 55 or 56 carrying
. operated by valve-operating apparatus in accord
ance with the desired length of travel of the se
a pawl 51 or 58 for engaging the associated rack
lected carrier 2B, and conveniently the adjust 60 and constituting ’a release device.` Each‘pawl has
aV projecting finger 51a or 58a which, when struck,
ment of the usual carrier stops 24 is employed
ñrst carries the pawl into engagement with its
to adjust the valve timing so that the change
rack and then displacesI the pawl-carrying 1e
over> from driving to >locking is effected as the
ver so that the pawl makes a stroke «whichshogs
selected carrier. rod 21 strikes a stop 24.
Forthis purpose the following construction is 65 the trip bar 52 and removes or trips the latch
adopted. i* The valve plungers ,I2a, I2b are con
nected to a horizontal rock shaft 38 so as to be
48^frorni beneaththe lever 4I' of horizontal bar
4D. «The fingers 51a, 58a are struck, one at each
of the traverse ofV the carrier rod v21V, by a
raised or lowered simultaneously, the plunger I2a
striker 59 which travels between ‘them’ and is
of the driving coupling I a being free to slide, as
said coupling travels to and iro, along a hori 70 mounted on the carrier rod ora -rod coupled to
it, _the 'striking faces-„of the striker being pref
zontal rod 3I supported from said rock shaft by
erably provided by adjustment screws 50.1,Thus
levers 32. The rock shaft 38 is biassed by spring
irrespective of the length of traverse as deter-¿_
33 to a position in which` the driving coupling Ia
mined bythe'setting ofi-«ther açljustable> end stops
is released and the locking coupling Ib is» opera
tiv’e' and lis -arrangedv toghe rocked, .to ,move the'. 75. 24, each time. .a-„çarrier rod; 21 .Strikesa .Step ,the
latch [i8 is released and the rod [lil descendsun
der` the influence ofispring- 33 to lower the 'valve
plungers l2a, I2?) and therebytorelease the. driv
ing' coupling la. and'to apply the locking cou
- This meansfor biassing the rack bar r52 .and the
latch'48 tothe centralposition may .consist of
a pair of scissor' fingers El, pivoted at Sion the
fixed part 5t. of 'themacliina which are drawn
together by spring 63 to grip a pair of pins 5d
on the bar 52.
The fluid under pressure is supplied by a suit
able source of supply (e. g. a pump or compres
sor) needing no illustration; air is preferred be
members together, comprising ,a housing, la; rod
extending slidablyv through it,: ai taper -. surface; in
the> housingpïa split taper'.y -col1et1:.en'circling the
rod within-the housing andrea-,operating >with
said surface, and za. piston in the .housing for
9.5, Apparatus according Ato claimßyhavingtwo
opposedataper surfaces Vin the.~housing, a `collet
for v`each-surface, and‘ two. opposed ¿pistonslfor
displacing the collets.
10. In a straight bar knitting machine, a yarn
carrier, adjustable stops for determining the
length of its traverse, a reciprocatable driver for
the carrier, a fluid-pressure operated coupling
for driving the carrier from the driver, and valve
means for rendering the coupling operative at a
predetermined stage in each traverse of the driver
I claim:
and for rendering it inoperative when the lcarrier
1. In a knitting machine, the combination with
traverse is determined by a stop.
a member movable to and fro, of a coupling com 20
11. In a straight bar knitting machine of the
prising two relatively-movable parts one of which
kind having a line of needles, a slur cock travel
is connectable to said member, a friction mem
ling therealong with a constant amplitude of
ber for connecting said parts friotionally, and
a carrier movable along the line
fluid-operated means for operating the friction
amplitude of traverse, and adjust
25 able stops for determining the carrier traverse,
2. In a knitting machine having two relatively
the combination of a driver for the carrier mov
movable members, a, fluid-pressure operated cou
able tov and fro with a constant amplitude, >a
pling for releasably connecting them comprising
releasable fluid-pressure operated coupling for
two relatively-movable parts resp-ectively con
driving the carrier from the driver, and valve
nested to said members, a gripper for gripping L_ means for rendering the coupling operative to
the two parts together, and fluid-operated means
drive the carrier with a predetermined lead over
for actuating the gripper.
the slurcock and for rendering it inoperative
3. In a straight bar knitting machine, a recip
when the carrier traverse is terminated by a stop.
rocatable .memben a driver therefor, and a
12. A machine according to claim 11, including
releasable driving coupling for connecting the
two valve-operating devices adjustable for spac
reciprocatable member to the driver comprisingv
ing with the stops, cam means travelling with
two relatively-movable parts connectable respec
the slur cock for operating through one or other
tively to said member and driver, a friction mem-`
of said devices during travel in either direction to
ber for connecting said parts frictionally to
render the coupling operative, release devices, for
gether, and fluid-pressure means for operating 40 rendering the coupling inoperative, adjustable
the friction member.
for spacing with the stops, and a striker travel
4. In a straight bar knitting machine, a, recip
ling with the carrier for operating a release
rocatable member, a stationary member, and a
device at each end of the carrier travel.
releasable locking coupling for hol-ding the re
i3. In a knitting machine, the combination of
cause such leakage thereof as may occur will
cause less trouble than oil in a knitting ma
ciprocatable member stationary by locking it to
.the stationary member, comprising «two rela
tively-movable parts connectable respectively to
' a member movable to and fro, a driver therefor
also movable to and fro, a stationary member,
a huid-pressure operated driving coupling for
said member and driver, a friction member for
driving the ñrst member from the driver, a ñuid
connecting said parts friotionally together, and
pressure operated locking coupling for locking the
fluid-pressure means for operating the friction 50 first member to the stationary member, valve
means controlling said couplings, two spaced
5. In a straight bar knitting machine, the com
valve-operating devices for operating the valve
bination with a driver, a reciprocatable member,
and a stationary member, of a fluid-pressure
operated driving coupling for driving the recip
rocatable member from the driver and a fluid
pressure operated locking coupling for holding
the reciprocatable member stationary by locking
it to the stationary member, and control valve
means for rendering said couplingsl operative 60
6. A machine according to claim 5, wherein the
reciprocatable member is a yarn carrier.
7. In a straight bar knitting machine having
means to render one coupling operative and the
other inoperative, cam means travelling with the
driver for operating the devices alternately one
at the commencement of each traverse of the
driver, two spaced release devices for rendering
the one coupling inoperative and the other oper
ative, means travelling to and fro with the mov
able member for operating said release devices
alternately, and means for varyingV the length of
travel of the movable member by adjusting the '
spacing between the two-valve operating devices
and between the two release devices.
at least one carrier movable to and fro with a 65
14. A machine according to claim 13, wherein
variable amplitude and a, reciprocatable driver
Vthe said movable member is a carrier, having i
'for driving it, a driving coupling comprising two
adjustable carrier stops and means for adjusting
Yrelatively-reciprocatable parts whereof one is
said operating devices and release devices with
connectable to the carrier and the other to the
said stops.
driver, a friction member for connecting them, 70
15. A machine according to claim 13, h‘aving
and fluid-operated means for operating said fric
the valve means movable between two alterna
tion member in accordance with the desired
tive positions in one of which the driving cou
amplitude of travel.
8. In a knitting machine, a releasable fluid
pling is operative and the locking coupling is
inoperative and in the other of which the driv
pressure operated coupling for connecting two 75 ing coupling is inoperative and the locking cou
pling is operative, a latch for locking said means
-sure operated locking coupling for locking the
in- one of these positions upon operation of either
of the 'valve-operating devices, and meansk in
the release devices for tripping the latch.
,16; In a straight bar knitting machine, the
operative during a' portion of each traverse of
the driver and for rendering the locking coupling'
combination of a yarn carrier, a reciprocatable
driver therefor, a huid-pressure operated fric
tion driving coupling for connecting the carrier
to the driver, a stationary member,- a fluid-pres
carrier to the stationary member, and valve
mechanism for rendering the driving coupling
operative during the remainder whereby the oar
rier is held stationary during the initial and ter
minal portion of each driver traverse.
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