US2664724A

US2664724A - Warp knitting machine

Info

Publication number: US2664724A
Application number: US263888A
Authority: US
Inventors: Lambach Fritz; Siegel Walter
Original assignee: ROBERT REINER Inc
Current assignee: ROBERT REINER Inc
Priority date: 1951-12-28
Filing date: 1951-12-28
Publication date: 1954-01-05
Anticipated expiration: 1971-01-05

Description

Jam 5, 1954 F. LAMBAcH ET Ax. 2,664,724

wARP KNITTING MACHINE l Filed Deo. 28, 1951 5 Sheets-#Sheet 1 La v H2 IO INVENTORS FRITZ L HMBFICH WHLTER SEGEL y/ TTORVN EY Jam5, 1954 A F. LAMBACH ET Ax. 2,664,724

WARP KNITTING MACHINE Filed Deo. 28, 1951 5 Sheets-Sheet 2 INVEN-roRs FRITZ nMBncH YwQL-VER slag-3E.

ATTORNEY Jan. 5, `1954 F. LAMBACH ETAL WARP KNITTING MACHINE Filed Dec. 28, 1951 5 Sheets-Sheet 3 VENTORS FR LFI M BQCH WALTER SIEGEI. BY

ATTORNEY Jan. 5, 1954 F. LAMBACH ET AL 2,664,724

wARP KNITTING MACHINE Filed Deo. 28, 1951 5 Sheets-Sheet 5 lNVENTORS FRITZ LFIMEFICH WF1 LT ER Sl EGEL.

1l 'f I ATTORNEY Patented jan. v,

WARP KNITTING MACHINE Fritz Lambach, Tenally, and Walter Siegel, Union City, N. J., assignors to Robert Reiner, Inc.,

Weehawken, N. J.

Application December 28, 1951, Serial No. 263,888

7 Claims. 1

This application is a continuation-in-part of our'copending application Serial No. 193,468, filed on November l, 1950, for A Warp Knitting Machine.

'.Ihe present invention relates to knitting machines, and more particularly to warp knitting machines wherein the warp beam or beams are rotated by a drive and wherein automatic controlling means are arranged for controlling the speed of rotation of the Warp beam or beams in dependence on a certain factor, for example tension in the warp yarns or decrease of the winding on the Warp beam, so as to maintain a substantially uniform circumferential speed of the winding or windings on the warp beam or beams for a substantially constant travelling speed of the warp yarns fed to the knitting implements.

At the beginning of an operation of the warp knitting machine said controlling means must be set for a predetermined speed or number of rotations of the warp beam or beams per rack (1 rack=l80 revolutions of the main cam shaft of the knitting machine) so that a fabric of a predetermined quality may be knitted with a warp yarn of a certain quality. During the operation of the warp knitting machine, while the diameter of the winding or windings on the warp beam or beams decreases, said controlling means increase automatically the speed of rotation of the warp beam or beams from the preset value at the start of the operation to a higher value at the end of the operation. Therefore, at the beginning of the next operation, said controlling means must be reset.

Heretofore, it has been necessary to compute `mathematically the speed or numbers of rotations of the warp beam or beams for causing the feeding of a predetermined length of warp yarn or Stringer in inches per rack as required .for a warp yarn of a certain quality. In other words, the presetting of the controlling means of the warp knitting machine for causing a. predetermined speed of the warp beam or beams involved time-consuming and tedious calculations, subject to costly errors.

An object of the present invention is to provide a warp knitting machine equipped with mechanical means completely eliminating the mathematical calculations, hitherto necessary for the presetting of the warp knitting machines so as to obtain the proper yarn feed by the warp beam or beams.

Another object of the present invention is to provide setting means for the presetting of the means controlling the speed of the warp beam or beams of a warp knitting machine, which setting means can Abe readily manipulated by hand.

A further object of the present invention is to improve on the art of warp knitting machines as now customarily made.

It is understood that the term Warp Beam-n used in the specification and claims indicates a single warp beam or an assembly of warp beams composed of a plurality of sectional warp beams.

Other objects and structural details of the invention will be apparent from the following description when read in conjunction with the accompanying drawings forming part of vthis specification, wherein: f

Fig. 1 isV a fragmentary side elevational view of a warp knitting machine according to the invention,

Fig. 2 is a sectional view taken on line`2-2 of Fig. 1,

Fig. 3 is a fragmentary rear elevational view of the warp knitting machine shown in Fig. 1,

Fig. Aiis an enlarged elevational view of an adjusting mechanism of the warp knitting machine shown inFig. 1, some parts being broken away,

Fig. 5 is an elevational view oi the detail shown in Fig. 4 as seen in the direction of the arrows 5-5 of Fig. 4, partly in section,

Fig. 6 is a vertical sectional view of an adjusting cam of a stepless change speed transmission of a machine shown in Fig.- 1,

Fig. 7 is a bottom plan view of the adjusting cam shown in Fig. 6,

Fig. 8 is a side elevational View, in an enlarged scale, of the mechanism for setting the adjusting cam of the stepless change speed transmission in various positions,

Fig. 9 is a side elevational view, some parts being broken away and some parts being shown in section, of the stepless change speed transmission,

Fg. 10 is a top plan view of a rst scale of the setting mechanism according to the invention,

Fig. 11 is a topf plan View of a second scale of the setting mechanism according to the invention,

Fig. 12 is a perspective view of a slider slidably mounted on the member bearing the second scale, and

Fig. 13 illustrates diagrammatically the setting of the setting mechanism according to the invention for a desired length of the yarn to be fed to the knitting implements or" the machine per rack.

The drawings illustrate only those parts cfa warp knitting machine which are necessary for an understanding of the invention.

Referring now to Figs. 1 and 3,213 generally indicates the frame of a warp knitting machine. A

xmain cam shaft 22 may be rotated .by an electric 'of the machine. Y

Warp yarns 32 fed by the upper warp beam to the knitting implements (not shovviiivofftlie warp knitting machine, are'enga`gd lwith an` upper tension rod 34 carried' by'-aimsi 35T 'rigidly connected with a shaft 38 rotatably arranged in suitable bearings of the `frame 2ll-voffthe ma chine. An arm 4D rigidly connected with said shaft 38 is under the action of a spring fwondaround a rod 44 securedto the frame of the machineaffsaid 'springf412f'being interposed between saidarm 4 f0fandan abuttingmember 43 tends to urge the shaft 38 together wit'hthe'tension rod 34::engaged fwithwthewarp vyarns 3-2 infcloclzwise direction {asviewedin'filnig.- 19g-so asj to :tension 4 speed transmission, the traction ring 314 is displaced axially by means of a cam 320 having a groove 322 engaged with the projecting end of thepin 3|'5;"t`rie 'cam 325 isrigidly" connected by sc1ews-324(see'Fig. 8)*With a`verticalshaft 326 rotatably arranged in the member 51 mounted on the casing 5| of the stepless change speed transmission 5 8. The cam 326 and its curved groove 32'2 are shown in detail in Figs. e and r1. The actuation vof said cam 320 for obtaining a change in`-`the' speed ofjtheoutput shaft |02 of the steptherwarp bya'rnsduring the operation of the *ma- The free end of another arm 46 securedto the shaft11-3-8wis pivotally connectedat 48-to"one end; @ifa-connecting rod50, the other endof which is-piyotedfat52.430afneutralizing member 55 (see Figfssl 1 and A 3 5)l rockably`- mounted' i on -al shaft 56 journalled in suitable bea-rings of -amember stepless-.change speed transmission generally indicated by 58. Said stepless change speed transmission-:initurnisattachedtothe frame 2 t" by screws 63. The purpose of said neutralizing memben54,.- and itsaction will be described fartherbelowin-detail .=;f-

- !A:.gearr82=1 eyed-to the main cam shaft 22 is in mes-hwith a--gear34 keyedto a--vertica`lshait QQ-frotatably. arrangedin `brackets `Y83- mounted on the frame 20 of the machine. Said vertical shaft-8 6 carries agear 90,for meshing engagement with a gear=94 keyed-5 to 'theinput shaft 98 of the stepless changespeedtransmission'58;

-A s.jbest showndnfFig. 9g tl'xeinput shaft S8 carries "a fxnembeiwli rigidly connected therewith. A seriesof taperedrollers -302 arerotatably carriedby said member -3 0 0,` and anothert `Yrotatablemember 304. Each of said -taperedrollers 302;;carriesV av planetaryfpinion 306 in meshing engagement :with the interior-gearing of'l a ring 303;'rotatablyfA arranged iri-` acover mountedl on the casing 6| of the steplesschange speedtransmission-V584, v'lfhe ring-gear 3 0 8 -isrigidly f connectdwith-a shaft 3 |2 Wl 1ich-through a'gearing (not-shown) is operativelyconnected with the output shaft |02 (see Figs. 1 and 3) of the stepi less change y speed transmission 58;:

The tapered rol l ers130 2-are-Y -in f rictional engagement with a non-rotatable traction ringor adjustingrbody 3|4,-whic l rcarries a pin"3|6vsl id aplyengaged with Aa nngipudinai sional s Af the casing 6|. AThus, the traction ring 3| 4 may be displacedfin a straight line parallel to the longitueziinal axis of the-st epless change speed-transmission 58. Thepin 3|6 engaged with the vslot 3 8 preventsthe traction' ring- 3| 4 -from rota-tion. It will be'lreadilyunderstood that the'speed of rotation of .the -taperedlrollers '3 0 2v 'and thus' 'oi-the shaft'3-|2'f coupledwitlrtheoutput shaft |02 Vof the stepless change speed transmission 53 de pe'Ii'dsY'on the position off the axially movable traction?ring "-3|`4lerig`ag'ed with said tapered rollers 302. "1'" *''In-'orderfto obtain a change in the speed of rotationof'tli'e' outputshaft'of the stepless chang less change-speed transmission 58 will be described hereinafter.

bestshovnin'Figs. l and 3, the output shaft |021o`f'the stepless change speed transmission 58 carries a sprocket wheel |04 connected by a chain |054 with a sprocket Wheel |03 keyed 5to a shaft H0 rotatably arranged in the frame. 2|) of the machine. v i" A gear `||2 keyed to said shaft H0 is in mesh with a gear Ils connected with the upper: beam 28 for rotating thesame.

As best shown in Figs. -1 and 2, a cam |3ilfrigidly connected with the vertical-shaft isiprovided with an eccentric groove |32 engaged with a stud idmountted on thelower surface ofian actuating element i3d-having a forkedend'ri engaged with the vertical shaft Sn.y The'other end or" said actuating element |35 ris pivotally connected at idd with theflower endg of a lever |42 swingably mounted on the shaft 55- carried by the 'member munted on-the casing ofthe stepless change speedtransmission; v v

vvill be readily understood, upon `rotation of the Verticalshat 8 5 by means of the main cam shaft '22' connected therewith through the tri 0f gea-TSY 8 2, the cam |35 `engagedwith the l'stud |3E--of the actuating element |36-,causes an'oscillation of the leverfll; about the axis of the shaft 56 as indicated by a doublearroW A in'Fig. v

' As shown in ifigs. 1 4 and 5, a rst springloadedpau'l |44 and a secondspring-loadedpawl Idd are swingably arranged on a stud |48 carried b'y said lever intermediate its ends.' ,The ist 4pavvl idd is arranged for cooperation with the'tetli'of a rst ratchet Wheel |55 rigidly connectecl" Witl theshaftf'Eby a l;ey"| 5 2.`

The second patri-|45 is arranged f or cooperation with the tethfof a second ratchetwheel i5sec`1ired4 to theshaft 55 by a ley 155.1.

Asbest shovvri in lfigs. 5 'and 8 a Worm 320 is integraly with`V or rigidly connected With the shaft 56 journalle'd in the member 57. Saidworm V328 isin mesh Withra Worm gear 3,30gloosely arranged on'the vertical shaft d20 carrying the cam 320. Thefworm gear 33d rests on a collar S32-secured to the shaftvgby a key 335|. The :lower surface of saidcollar 332 rests yon the end surface fofa bushing `335 arranged `in the member,` 57,' thus holding the vertical shaft 326 Yand lthe cam,` 320 connected therewith in its position. A disk 3 35 of frictional material resting on the upper surface ofthe Worm-fgearf330 is interposedbetvveensaid Worml gear 330 and a hand wheel or setting meansl 340 connected Wi-th'the verticalshaft 326 through a spline 342.- A spring 3M arranged between said hand Wheel 340and a collar 346 mounted on the shaft 326 tendsV 't heldI me hand' 'wheel- 340 vin frictionai e'n'ga'gement with 'the' Worm'gear 33 0'tl1rough lthe 'medi'- um of sani sisi; sae `joff"'fnctinaimaterial.

When th`e'-wor1n" gear-3 3 05i`s rotated' a rotation of the Wor'rir32`8 arranged'rfthe" shaft 56, the shaft 326 carrying the adjusting cani`3'20 of the stepless change speed transmission is 'rotated through the medium of the hand Wheel 340 frictionally engaged with the worm gear 336 and connected with said shaft 326 through the spline 342.

On the other hand, if, for the purposes of setting the mechanism in a manner to be described hereinafter, the hand Wheel 346 is rotated, it causes through the medium of the spline 342 a rotation of the shaft 326 carrying the adjusting cam 320 while, at the same time, it may be rotated relative to the Worm gear 330 held in its position by the worm 328; the spring 344 being strong enough to assure a suflicient frictional engagement between the worm gear 330 and hand Wheel 346 when the Worm gear 336 is actuated, permits on the other hand an overcoming of the frictional forces when the hand wheel 346 is actuated.

When the tension rod 34 is in a mean position, as shown in Fig. 1, during the operation of the machine, the neutralizing member 54 connected with the tension rod 34 through the medium of the connecting rod 56, arm 46, shaft 38 and arm 36, is in the position shown in full lines in Figs. 1, 4 and 5. v

If, however, due to a change in the tension of the Warp yarns, the neutralizing member 54 is swung by the tension rod 34 and connecting rod 50 either in clockwise direction or in counterclcckwise direction, the end |66 or the end |62 of the curved surface |58 is displaced to such an extent that during the oscillation of the'` lever |42 either the pawl |44 or the pawl |46 becomes disengaged from the curved surface |58 and drops into a space between teeth of the ratchet wheel |56, or the ratchet wheel |54, respectively, whereby either the ratchet wheel |56 or the ratchet wheel |54 is advanced by the associated pawl in counterclockwise or in clockwise direction. Such an advance of the ratchet wheel |56 or |54 results in a corresponding rotation of the shaft 56 and through the worm 328, worm gear 336, friction disk 338, hand Wheel 346 and shaft 326 of the adjusting cam 326 of the stepless change speed transmission 58, whereby the traction ring 3|4 of the latter is axially displaced for a change in the speed of the output shaft |62 of said transmission resulting in a change of speed of rotation of the beam 28.

` Such a change in the tension of the warp yarns occurs during the operation of the machine. When Warp yarn is fed by the warp beam 28 to the knitting implements (not shown) the diameter of the Winding on the beam decreases. This results in an increase of the tension in the warp yarns. Now, a correction of the speed of the output shaft |62 of the stepless change speed transmission 58 by means of above described automatic controlling means (tension rod 34, connecting rod 56, lever |42, one of the pawls |44, |46, shaft 56, worm 328, worm gear 336, shaft 326) takes place for an increase of the speed of the beam 28 so as to reduce the tension in the warp yarns. If during this controlling action the tension in the warp matic controlling means counter-act in reversed sense. Then, there will be again an increase of the tension in the Warp yarns calling again for an action of the automatic controlling means for a reduction of the tension in the warp yarns,.

etc. In any case, the play back and forth of said automatic controlling means will cause substantially a constant tension in the warp yarns during the operation of the machine. This means, on the other hand, that the warp yarns have a substantially constant travelling speed, which, in View of the progressively decreasing diameter of the winding on the beam, requires an increase of the speed of rotation of the Warp beam 28 speed of rotation of the output shaft |62 of the stepless change speed transmission during the operation of the machine. Thus, if at the beginning of the operation of the machine, the adjusting element or cam 326 of the stepless change speed transmission 58 was set by the hand wheel 340 for obtaining a predetermined number of revolutions of the warp beam per rack (one rack=480 revolutions of the main cam shaft of themachine), owing to the automatic control by the above described controlling means, the speed of the output shaft |62 of the stepless change speed transmission 58 will be increased for a higher number of revolutions per rack of the Warp beam 2S at the end of the operation of the machine. Consequently, it becomes necessary to reset the adjusting means 326 of the stepless change speed transmission 53 prior to the restarting of the machine, so as to obtain again the same lower number of revoluticns per rack of the Warp beam, if the same quality of warp yarns is used and the saine quality of fabric shall be obtained.

Furthermore, the problem of properly sete ting the adjusting cam 326 of the stepless change speed transmission -56 occurs each time when warp yarn of diierent quality is used and/or a fabric of diiferent quality should be obtained. ms i matter of fact, the length of warp yarn, the so called Stringer length, to be fed by a warp beam to the knitting implements and measured in inches per rack depends on the quality of yarn used, for example 55 denier or denier, on a tight or loose knitting of the fabric and on the type of pattern of the fabric., Therefore, a chart is given to the operator of,- the machine indicating to him the length of the stringer in inches per rack for a certain fabric to be knitted with a certain yarn. Now the operator is confronted with the problem to determine the proper speed of revolutions per rack of the warp beam so as to obtain the desired stringer length. This speed of the Warp beam in turn depends on the diameter of the winding on the beam.

Hitherto it was necessary to determine the speed of the warp beam by mathematical calculations which require some skill and quite often it could not be carried out by an operator of a warp knitting machine without errors. Such an error might prove to be quite costly, if for example owing to an erroneous calculation the length of warp yarn fed to the knitting implements is more than desired or else, if, owing to an insuiicent length oi Warp yarn fed to the knitting implements an inferior quality of the fabric is obtained. The number of revolutions of;

yarns is reduced slightly beyond the required"` tension in the. Warp yarns, above described auto-Y probierei thforimnaf the. warp beamperraclemay belcaloulatedbythe following formula:

s r= c wherein 'znumber of revolutions ofl` the beam per rack,

the beam as measured/is; 28.42. inches. The n revolutions per rack;t

These calculations are entirely eliminated by the following setting mechanisrnry Referring now to Figs. 8 andY 10--1- 3, '3 48 v indin cates a member inthe shape o f a sector o fj an annulus, which is xedly .mounted o n `the member 1 by means of4 screws'35- passing through bores 352- of` said member. The member 343 bears a first scale flhaving a logarithmic calibration ofthe Stringer length in 'inches perracls.

Furthermore, a -ring 3`5 3 bearing fa second scale 358 having a logarithmic calibration ofthe circumference of-` the jwinding onA the beam in inches is rigidly secured'to theupper surface cf the hand wheel 34u Aby means of' screws SEQ passing through slats. 36?; of` Saidzrixlg Moreover,l a slider generally indicated by 357,4 is slidably n iounted onthe fixed member 348 bearing the first scale 354; Said

slider

35,4; has

a window 365i with a. mark 3556 `for cooperation with the rst scale 3311. An upwardly extendf ,ing portion 368 of said slider beingbent extends vover the ring 355 on the hand wheel 340 and carriesat its end a pointer 3110er asuitable mark `for cooperation with the second'- scale offthe I,circunfrf'eren-ce off the winding on the beam.

If desireckbut not-necessarily, the sectorfmemlber 3dB-may be provided witha center mark "3752, shownin. dash. lines, andthe ring. 356:rnay be pro'- vided. with a third. scale 3.14, shown in dash lines, indicating the speed. of4V the beam in revolutions jper rack. y i.. ,.-f

Above described setting mechanism may be 'used-as fQllQWS.; .-f .Y

The Slider. 35.4 15mm/.ed 21.1.0113', th?. 559ml? mem.' ber 35.8 until the mark 366 isV opposite the cali-fbration for the length, of Stringer inI inches to -tbe fed in. inches per-ra ck to the/knitting imple'.- ments, for example the slider 364 is', set in.4 the position for 41 inchesV per rac as` shgwn in Then the hand wheel 340 carrying the ring 355 with the scale 358 is rotated untill the calibration for the value, for example 28A- 2, of the lcircumference of the windingon the beam is opposite the-pointer* 311-03, as shown in Fig. 13. As theY scales ".554v and'` 358 have logarithmic-calibrations, the ring35tand= thehand-.wheel 340. con.- nected, with thevertical: shaft;` 326iA carryingy the adjusting

cam7

32,9; of; the stepless changespeed transmissiondhave been .immediately set for the proper; Speed of the.. were. beam, .the setting 0f Saidf #WQ lggeithmic Scales. answering the unnecessary.

-Iffthe ring 356-is-` provided with` thethird scale 3.14 the` value 1.44 ofy the number of revolutions offthe` beam per rack. can be determined byshifting the slider 364 into the dash line` position shown in Fig. .13, wherein themark 365 of its windovtr'y isin alignment withthe centermark 312: anditspointer 31D isY in alignment with the calibration 1.44 of the beam speed scale 314.

Assaid; before, upon the setting of the hand wheel` 340111 the manner described above, the adjusting camy 320 ofv the stepless change speed transmission SSisin the proper position for obtaining thedesiredspeed of the Warp beam. The shapeof the curved groove 322 (see Figs. 6, 7, endg) of said adjusting cam 32,0 cooperating with, the pin 315 of the traction ringl 3M is deisrrnilfletl-l by thev logarithmic calibration. 0f the scale 358 on the ring 356 in conjunction with the characteristics of the s teplesschange,s peedtransmission 5 8, so that fora given position of the adjusting cam 324i obtained by above described setting o f the hand, wheel 341i the traction ring 3 14 is in such a position that the output shaft L52 -offthestepless changespeed transmission 58 rotates at such a speed that the warpbeam driven by s aid output shaft makes the correct number of revolutionsper rack, for example 1.44 revolutions per rack in the example given above.

l lit will be readily understoodfrom above, that the'presetting of the beam. speed by means of thesetting mechanism according to the invention'rnay. be readily carriedout without any difcultiesirrespective Ofthe position of the adjusting cam 323 andthe hand wheel 340 at the end of a knitting operation, owing to the action of the automatic controlling means during the operation, of themachine.

If;, f or example, a', diierent presetting of the beam, speed is desired, for example for feeding a, `stringe rlength of 54.7 inches per rack when the circumference of the winding on the beam amounts. 120.313 inches, it is simply necessary to set the slider 364 in position for alignment of the marl 3iiiwith. the calibration 54.7. and rotate the hand wheel 3,40 until the pointer 31E! is in register with the calibration 31.3 of the scale 358. ND.Cellatn,SIlGQeSsary.

The speed of the lower warp beam 30 (see Fig.- 1) feeding the warpyarns 6 0 to the knitting implements, 0f the` machine mayv be set in the same manner as described above byy a handwheel 3.7.5.. Connected with the adjusting cam of a stepless change speed .transmission 8l) driving the warpjbearn. 3Q. As thedriving means, controlling means and4 setting means nassociated With the lower'warp beam. 3Q are identical with the corresponding means associated with the upper warp beam 23, a detailed description thereof is We have described preferred embodiments of our invention, but it is understood that this disclosure is forv the purpose o f illustration, and thatvarious omissions or changes in shape, proportion and arrangements of parts, as well as the substitution of. equivalent elements for those herein. shown. and. described, may be made without departing fromy the spirit and scope of the invention. as set forth. inv the appended claims.

For exa-triple,l the. setting device according to the invention could be applied t0 a stepless change speed. transmission wherein the automatic controlling means moving thel adjusting means of thetransmission from al preset position atethe beginning. of the. operation to. another position at the end of the operation are responsive 9 to the reduction of the diameter of the winding on the beam rather than to a change of the tension in the warp yarns.

Moreover, the setting mechanism according to the invention could be applied to a stepless change speed transmission with adjusting means of a different construction.

What we claim is:

1. In a warp knitting machine, the combination of: a rotatable Warp beam arranged for feeding warp yarns to knitting implements of the machine, a variable speed drive including a rotatable output element arranged for rotating said warp beam, said variable speed drive including further a movable adjusting element associated with said output element for adjusting the speed of the latter, said adjusting element 'being settable in various positions, movable setting means associated with said adjusting element for setting same in a lpredetermined position, automatic controlling means associated with said adjusting element for moving same during the operation of the machine from said predetermined set position into another position so as to maintain a substantially constant circumferential speed of i said warp beam, and the curve of said camming the progressively decreasing winding of yarn on ence of the winding in inches, and said slider having a second mark for cooperation with said second scale whereby said setting means may be brought into a predetermined 'position relative to a set position of said slider so as to set said adjusting element in a predetermined position for adjusting a predetermined number of revolutions per rack of said warp beam.

2. In a warp knitting machine, the combination of a rotatable warp beam arranged for feeding warp yarns to knitting implements of the machine, a variable speed drive including a rotatable adjusting cam, a speed adjusting body displaceable in a straight line direction, rotatable transmission means operatively engaged with said speed adjusting body, and a rotatable output element connected with said transmission means, and arranged for rotating said warp beam, an engaging element on said adjusting body, said adjusting cam having a curved camming surface operatively engaged with said adjusting body whereby the latter may be displaced for adjusting the speed of said output element, said adjusting cam being settable in various positions, movable setting means associated with said adjusting cam for setting same in a predetermined position, automatic controlling means associated with said adjusting cam for moving same during the operation of the machine from said predetermined set position into another position so as to maintain a substantially constant circumferential speed of the progressively decreasing winding of yarn on said warp beam, a fixed member bearing a first scale having a logarithmic calibration of the length of warp yarn to be fed in inches per rack, and a movable slider having a first mark for cooperation with said first scale whereby said slider may be set in a predetermined position, said movable setting means bearing a second scale having a logarithmic calibration of the circumference of the surface being determined by the logarithmic calibration of said second scale in conjunction with the characteristics of said variable speed dri-ve for obtaining a predetermined speed of the output element at a predetermined position of said adjusting body.

3. In a warp knitting machine as claimed in claim 1, said setting means being in rigid connection with said adjusting element, and said automatic controlling means being in frictional engagement with said setting means.

4. In a warp knitting machine as claimed in claim 1, a rotatable shaft carrying said adjusting element, a setting element rigidly connected with said shaft, said automatic controlling means including a controlling member loosely engaged with said shaft, friction means interposed between said controlling member and said setting element, and resilient means arranged for holding said controlling member frictionally engaged with said setting element.

5. In a warp knitting machine as claimed in claim 1, said slider being slidably mounted on said fixed member bearing said first scale.

6. A device for use in conjunction with a warp knitting machine having a warp beam driven by a variable speed drive including a movable adjusting element for adjusting the speed of said warp beam, said device comprising in combination: a xed member bearing a first scale having a logarithmic calibration of the length of warp yarn to be fed in inches per rack by the warp beam, a movable setting element, said setting element being movable relative to said fixed member and being arranged for connection with said adjusting element for setting same in a predetermined position, said setting element bearing a second scale having a logarithmic calibration of the circumference of the winding on the beam in inches, and a slider movable relative to said fixed member, said slider having a first mark for cooperation with said first scale whereby said slider may be set in a predetermined position, and said slider having a second mark for cooperation with said second scale whereby said setting element may be brought into a predetermined position relative to a set position of said slider for obtaining a predetermined position of the adjusting element of the variable speed drive corresponding to a predetermined number of revolutions per rack of the warp beam.

7. In a device as claimed in claim 6, said slider being slidably mounted on said fixed member bearing the first scale.

FRITZ LAMBACH. WALTER SIEGEL.

References Cited in the file of this patent UNITED STATES PATENTS Morrison June 10, 1952