NSV@ 5, i946. ' J. E. LYNAM 2,410,668 COTTON’S PATENT AND OTHER STRAIGHT BAR KNITTING MACHINES Filed July 14, 1945 223 5 _sheets-sheet 1 Nav, 5, i946. J. E. LYNAM 2,436,668 COTTON’S PATENT AND OTHER STRAIGHT BAR’KNITTI'NG MACHINES Filed July 14, 1945 v » F/Gél. 'r ^ ',3/ ' 5 SheetS-Shéet 2 Nav. 5, 1946. ' ` v . J. E. LYNAM Eßwßëß ~ COTTON’S PATENT AND OTHER STRAIGHT YBAR.KI‘IIT’I‘ING MACHINES Filed July 14, 1945 5 Sheets-Sheet 5 o ‘g \ «Ö ì _ " u Lk «f2 ‘o @I »s P r L É 22 . g «1 t N “j . . í'oíw and Inventor Nov. 5, 1946.' ` J. E. LÍYNAM ¿masas COTTON’S PATENT AND OTHER STRAIGHT BAR KNITTING MACHINES Filed July 14, 1945 ` 5 sheets-sheet 4 o .Q m S? O @ V@ @ .I O à? (o3 ’ a E \ l* ë a :e Y?, v ‘3 „Je 3' ® V è . ` 3 -` Si a c, Si ‘vv V‘“ _n ‘0 v. ì -Inventor ¿52AM/MW Attorney Nov. 5, 1946. J. E. LYNAM coTToN’s PATENT AND OTHER STEAIGHT‘BAR KNITTING MACHINES Fiied July 14, 1945 www w mm Patented Nov. 5, 194$ UNITED STATES PATENT OFFICE 2,410,668 CQTTON-’S PATENT AND OTHER STRAIGHT ' BAR KNITTING MACHINE 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 1 2 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 and ` 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, ing 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 aiioßás 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).. *` Y ' ~» »l » Y . _ 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 At 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 end 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 2,410,668 5 . 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 plinglb. N ~ e . s ^ f - 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 operating'thelcollet.' ' . - y ; 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 chine. 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 reciprocation, a carrier movable along the line fluid-operated means for operating the friction with a variable amplitude of traverse, and adjust member. 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 member. 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 alternatively. 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 2,41o,ees 8 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. , JOHN EDWARD LYNAM.