US2982083A - Test apparatus for textile drafting and spinning machines - Google Patents

Test apparatus for textile drafting and spinning machines Download PDF

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Publication number
US2982083A
US2982083A US591498A US59149856A US2982083A US 2982083 A US2982083 A US 2982083A US 591498 A US591498 A US 591498A US 59149856 A US59149856 A US 59149856A US 2982083 A US2982083 A US 2982083A
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Prior art keywords
roll
speed
drafting
roving
delivery
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Expired - Lifetime
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US591498A
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English (en)
Inventor
Breitenbach Karl-Heinz
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SKF GmbH
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SKF Kugellagerfabriken GmbH
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/32—Counting, measuring, recording or registering devices

Definitions

  • the present invention relates to textile machines' More particularly, the present invention relates to machines for drafting and spinning textiles. 1
  • the apparatus and process for testing such rovings preparatory to drafting and spinning thereof are exceedingly disadvantageous. It is not feasible to adjust the drafting machine itself, because such adjustments would require an extremely long period of time and constant stopping and starting of the drafting machine. It is therefore customary to test the rovings on miniature drafting machines in conjunction with the subsequent spinning apparatus, but with such miniature machines it is also necessary to stop and start the machine constantly until the desired adjustments are determined. Furthermore, it is customary to determine the uniformity of the rovings before and after the drafting thereof, and the measurement of the roving is usually made-first before the roving passes through the drafting rolls and after .the roving passes through the drafting rolls. However, because of the changes which take place in the roving during the processing thereof a comparison between the measurements made before and after the drafting machine only gives confusing results, and the proper adjustment of the machine is exceedingly ditlicult to carry out. r
  • One of the objects of the present invention is to provide a drafting and spinning machine capable'of being adjusted during its operation in orderto processing of the textiles.
  • Another object of the present invention is to provide a means for adjusting the speeds of rotation of all of the rolls of a given drafting machine in particular'combinations which will control both the predrafting; the main drafting, tthe total drafting, and the rate of delivery of provide proper yarn to the spinning part of the machine.
  • a further object of the present invention is to provide.
  • An additional object of the present invention is to pro vide a-'means for measuring the uniformity of the roving and yarn in' a manner which will simultaneously indicate, during operation .of the machine, the measure an apparatus capable of accomplishing all ofthe above objects and at the same time composed of. simple and ruggedly constructed elements which are very reliable in operation. a
  • the presentinvention mainly consists of a drafting. and spinning apparatus which includes a plurality, of drafting rolls locatedone behind the other along the drafting plane. An infinitely of the drafting machine proper.
  • variable drive is operatively connected to the rolls for changing the speeds of rotation of all of the rolls without changing their relative speeds of rotation and forindependently changing the speed of rotation of one roll with respect to the other rolls.
  • a measuring means is provided for measuring the uniformity of the roving just ahead of the entrance roll of the drafting machine and just after the delivery roll thereof, 1
  • Fig. l is a side elevational view on a relatively sm scale of a structure according to the present invention.
  • Fig. 2 is a schematicillustration of the structure. of Fig. l;
  • Fig. 3 is a schematic illustration of a measuring means according to the present invention
  • 1 v Fig. 4 is a schematic illustration of another embodiment of a measuring means according to the present inv'ention.
  • the struc; ture of the-invention includes a frame 1 which carries at a lower portion thereof a drive motor 2 connected to any suitable source of current, the frame 1 beingmade, for example, of welded sections of angle-iron.
  • the drive motor 2 drives a stepped pulley 3 which through a V- be1t 5 drives another stepped pulley 4 which is operatively connected to a drum 6 supported for rotation about its axis by suitable bearings carried by the brackets 7 which are in turn ai'fixed to the frame 1 to be carried. thereby.
  • a spindle driving band 8 is driven by the drum 6 and passes about the spindle 9 to drive the latter, and the band 8 is maintained tensioned by a roller pressing against the same andturnably carried by a bell crank 10 pivotally carried by a suitable support on the frame 1, the lower arm of this bell crank carrying at its left end, as viewed in Fig. 1, a weight which causes the roller to press against the band 8 to maintain the latter under ten- SlOl'l.
  • the frame 1 additionally carries suitable support beams 11, which carry the drives 12 and 13, a third drive 14 being carried by an upper portion of the frame 1.
  • This upper portion of the frame also carries a creel 15 and another smaller frame 16 which supports the lower rolls
  • the frame 16 turnably supports the lower entrance roll 17, the lower intermediate roll 18, and the lower delivery roll 19, these rollsbeing supported in a known way for rotation about their axes, respectively, and cooperating with unillustrated top r0118, respectively, which are supported in a conventional manner by a top rolls carrying arm which is pivotally supported adjacent its rear end by the frame 16.
  • sprocket wheels 20and 22 andchain 21 may be in the 'form of pulleys and a belt, respectively.
  • the drive 12 includes in addition to its input shaft which is fixed to the sprocket wheel 22 anoutput shaft which fixedly carries a sprocket wheel 25, and the speed of rotation of the output-shaftof the drive 12 can be manually regulated infinitely by 3 l turning the hand wheel 23 which is fixed to a shaft supported for rotation about its axis by suitable bearings on the frame 1 and which is fixed to a sprocket wheel 24 which drives a sprocket chain connected to another sprocket wheel which turns a screw which extends into the driving mechanism 12 for infinitely varying, in a manner well known in the art, the drive to the output shaft in a completely stepless fashion.
  • the sprocket wheel 25 cooperates with a sprocket chain 26 which drives a sprocket wheel 27 fixed to the delivery roll 19 of the drafting mechanism, so that by actuation of the hand wheel 23 the speed of rotation of the delivery roll 19 may be steplessly regulated.
  • the output shaft of the drive means 12 fixedly carries a sprocket wheel 28 which cooperates with a chain 29 which in turn drives a sprocket wheel 30 fixed to the input shaft of the drive means 13. In this way a drive is transmitted from the drive means 12 to the drive means 13.
  • This drive means 13 also includes an output shaft,
  • this output shaft may be 2 infinitely varied by a manual actuation of the hand wheel '31 which turns a shaft supported for rotation about its axis by bearings on the frame 1 and which operates a sprocket chain 32 through a suitable sprocket wheel for turning a friction transmission device capable of providing an infinitely variable speed for the output shaft of the drive means 13, in the same way that actuation of the hand wheel 23 provides an infinitely variable speed for the output shaft of the drive means 12.
  • the output shaft of the drive means 13 fixedly carries a sprocket wheel 33 which drives a sprocket chain 34 which in turn drives a sprocket'wheel 35 fixed to the entrance roll 17 of the drafting machine, so that the actuation of the hand wheel 31 can control the speed of rotation of the entrance roll 17 in a stepless fashion. Furthermore, the output shaft of the drive means 31 fixedly carries another sprocket wheel 36 which drives a sprocket chain 37 operatively connected to another sprocket wheel 38 fixed to the input shaft of the drive means 14, so that in this way the drive is transmitted from the drive means 13 to the drive means 14.
  • the output shaft of the drive means 14 may have its speed infinitely varied by actuation of a hand wheel 39 fixed to a shaft supported for rotation about its axis by suitable bearings on the frame 1 and connected to a sprocket wheel which operates a chain 40 connected to another sprocket wheel which is connected to a screw for shifting a friction transmission member to provide a stepless variation in the speed of the output shaft of the drive means 14, in the manner described above.
  • This output shaft of the drive means 14 fixedly carries a sprocket wheel 41 which drives a chain 42 which in turn cooperates with a sprocket wheel 43 fixed to the intermediate roll 18 of the drafting mechanism, so that by actuation of the hand wheel 39, the speed of rotation of the intermediate roll 18 can be regulated.
  • Fig. l The above described structure of Fig. l is shown diagrammatically in Fig. 2 in a manner which clearly illustrates the arrangement of the infinitely variable drive means for transmitting the drive from the motor 2 to the several rolls of the drafting machine.
  • handwhecl 31 is shown at the left side of the apparatus for the sake of convenience. It is actually positioned as shown in Fig. 1.
  • the speed of rotation of the delivery roll 19 can be infinitely varied so as to increase or decrease the rate of delivery.
  • more or less yarn is delivered from the delivery roll 19 to the spindle 9.
  • the speed of rotation of the spindle 9 does not change, the twist of the yarn increases or decreases in accordance with the rate of delivery.
  • adjustment of the speed of rotation of the delivery The reason for this is that the drive means 12 which drives the roll 19 also transmits the drive to the drive means 13 which drives the roll 17, and from the drive means 13 the drive is transmitted to the drive means 14 which drives the intermediate roll 18. Therefore, when the speed of rotation of the delivery roll 19 is adjusted, the speeds of rotation of the rolls 17 and 18 are also adjusted and the relative rotations of the rolls does not change so that the draft remains unchanged and only the rate of delivery is regulated.
  • the speed of rotation of the entrance roll 17 is regulated, and inasmuch as the drive means 13 transmits the drive to the drive means 14, the speed of rotation of the intermediate roll 18 also changes. However, the speed of rotation of the roll 19 does not change.
  • the main draft which takes place between the rolls 18 and 19 can be regulated.
  • the predraft which takes place between the rolls 17 and 18 does not change, however, because the relative speeds of rotation of these rolls remains unchanged.
  • the predraft does not change, the main draft does change, and therefore the total draft changes in accordance with the change in the main draft.
  • the hand wheel 39 is actuated, only the speed of rotation of the intermediate roll 18 can be changed in a stepless fashion.
  • the speeds of rotation of the rolls 17 and 19 remain unchanged, so that the total draft remains unchanged.
  • the speed of rotation of the roll 18 is changed so as to decrease the predraft, then the main draft will increase, and on the other hand if the speed of rotation of the roll 18 is regulated so as to decrease the main draft, then the predraft will increase.
  • the drive means 13 including the hand wheel 31 constitute therefore adjustment means for adjusting the main draft and the drive means 14 together with the hand wheel 39 constitute further adjustment means for adjusting the predraft together with the main draft.
  • Fig. 3 shows schematically a means for measuring the uniformity of the roving as it is treated by the drafting o mechanism, as well as a means for indicating the measurements and a means for transmitting the measurements from the measuring means to the indicating means.
  • the measuring means has a pair of stations respectively located before and after the drawing mechanism, and with the measuring means and indicating means it is possible to indicate simultaneously the condition of a portion of the yarn just before it enters the drawing mechanism and the condition of the same portion of the yarn after it' leaves the drawing mechanism.
  • a spool 44 carrying the roving 45 is located on the creel 15.
  • An unillustrated frame fixedly carries a bar 46 which supports the drafting mechanism in a known way.
  • This drafting mechanism includes a top rolls carrying arm 47 which carries in a 5 known way the upper pairs of rolls 48, 49, and 50, and
  • the capacitors I59 and 60 are respectively connected to apair-of transmitters 61 and 62, and each transmitter includes a frequency modulating electron tube transmitter with simultaneous high frequency rectification.
  • the low frequency signal which is produced by the rectification is transmitted from the transmitters 61- and 62 respectively to a pair of recording and reproducing ampli tiers 63 and 64."
  • each of these ampli bombs is actually a pair of amplifiers 'one of which is capable of amplifying signals to be recorded and the other of which is capable of amplifying signals to be reproduced, the transmitters 61 and 62 being electrically connected to the recording channel of the amplifiers 63 and 64.
  • the recording channels of these amplifiers are electrically connected respectively to a pair of recording heads 65 and66 which cooperate with a magnetic recording tape 67 having a pair of tracks respectively cooperating with these recording heads which record on the-tracks lack of uniformity in the roving or yarn which produces frequencies greater than 20 cycles.
  • the recording heads 65 and 66 are displaced from each other, as shown in Fig. 3. a Y
  • the speeed ofmovement of the tape 67 may be made infinitelyvariable, while the distance between the recording heads 65 and 66 remain unchanged, or if the speed of movement of the tape 67 is fixed then suitable means may be providedfor regulating the distance between the recording heads 65 and 66;
  • the speed of movement of the tape 67 may be varied by driving the roll 80 overwhich the tape 64 is guided by a motor 81 and by arranging a variable speed drive 82'of any well known construction in the transmission between motor 81 and roll 80 as schematically illustrated in Fig.
  • a pair of reproducing heads 68 and 69 are located beside each other and pick up the frequencies recorded on the two tracks by the recording heads 65 and 66 and transmit these frequencies to the reproducing channels of the amplifiers 63 and 64 respectively, from which these frequencies are transmitted to a pair of meters 70 and 71 which indicate the frequencies, or the frequency may be transmitted withor without the meters 70 and 71 to a pair of curve marking means 72 and 73 which are capable, in a known way, of marking curves on the moving strip 74, as indicated in Fig. 3.
  • the capacitors 59 and 60 cooperate with the transmitters 61 and 62 which in turn cooperate with the amplifiers 75 and 76 to actuate atpair of curve marking means 77 and 78 which are displaced from each other along the moving strip 79, as indic atedin Fig. 4.
  • a recording tape is not necessary with the embodiment of Fig. 4.
  • either the speed of movement of the strip 79 is regulated sothat the'distance between a point marked with) the marking means 77 anda point marked with the marking means '78, along the length of the strip 79, corresponds to the distance between the capacitors 59 and 60 with respect to the movement of a portion of the yarn.
  • the portion of the yarnwhich is located between the plates of the capacitor 60 to actuate the recording means 78 provides a mark on the strip 79 which is located beside a mark on this strip previously provided by the marking means 77 when the same-p01"- eesaoss 6 tion of the yarn 'was in the form of airoving part located between the plates of the capacitor 59.
  • Themeans of regulating the speed "of movement of the strip 79" may be constituted bya motor 83 driving, over a variable'speed drive 84 of any well known construction, the roll 85 whichengages the strip 79 to -move the latter in the direction of thear'row.
  • the invention is also applicable to drafting-arrangements'where there is only one drafting zone andonly entrance and delivery rolls, but nointermediate rolls.
  • the' infinitely variable drivemeans is capable of varying the speed of rotationof the delivery rolls together with the entrance rolls without varying their relative speeds of rotation
  • theinfinitelyvariable drive means is capable of varying the speed of rotation of the "entrance rolls with respect to the delivery rolls.
  • the invention is applicable to drafting arrangements where a pair of intermediate rolls are located betweenthe entrance and the delivery rolls. With such an arrangement, the entrance and deliveryrolls are controlled in the manner described.
  • a fourth drive means is provided to vary the speed of rotation ofone of the intermediate rolls with respect'to the other of the intermediate rolls.
  • a drive which is infinitely variable cooperateswith the condensing rolls for varyingthe speeds of all of these rolls without varying their relative speeds, so that the rate of movement of the yarn through the condensing rolls may be regulated but no draft is provided in these rolls.
  • suitable erasing heads are provided to cooperate with the tape 67 before the recording head or after the reproducing heads 68and 69.
  • adjusting means operatively connected to said entrance roll means for changing the speed thereof with respect to said delivery roll means for thus adjusting the drafting speed; first measuring means located along the path of movement of a roving to said entrance roll means for measuring the uniformity of the roving to be drafted; second measuring means located along the path of movement of the roving from the delivery roll means for measuring the uniformity of the drafted roving; and adjustable indicating means for simultaneously indicating the uniformity of a portion of the roving to be drafted and the uniformity of the same portion of roving after being drafted regardless of the speed of said roll means.
  • a textile drafting machine in combination, entrance roll means and delivery roll means; infinitely variable drive means operatively connected to both of said roll means for changing the speed thereof without changing their relative speeds for thus adjusting the rate of delivery; adjusting means operatively connected to said entrance roll means for changing the speed thereof with respect to said delivery roll means for thus adjusting the drafting speed; first measuring means located along the path of movement of a roving to said entrance roll means for measuring the uniformity of the roving to be drafted; second measuring means located along the path of movement of the roving from the delivery roll means for measuring the uniformity of the drafted roving; and adjustable indicating means for simultaneously indicating the uniformity of a portion of the roving to be drafted and the uniformity of the same portion of roving after being drafted regardless of the speed of said roll means, said adjustable indicating means including a pair of indicating instruments, and magnetc recording tape means for receiving the measurements from said measuring means and for transmitting the same to said indicating instruments, respectively.
  • a textile drafting machine in combination, entrance roll means and delivery roll means; infinitely variable drive means operatively connected to both of said roll means for changing the speed thereof without changing their relative speeds for thus adjusting the rate of delivery; adjusting means operatively connected to said entrance roll means for changing the speed thereof with respect to said delivery roll means for thus adjusting the drafting speed; first measuring means located along the path of'movement of a roving to said entrance roll means for measuring the uniformity of the roving to be drafted; second measuring means located along the path of movement of the roving from the delivery roll means for measuring the uniformity of the drafted rving; and adjustable indicating means for simultaneously indicating the uniformity of a portion of the roving to be drafted and the uniformity of the same portion of roving after being drafted regardless of the speed of said roll means, said adjustable indicating means including a pair of indicating instruments, magnetic recording tape means for receiving the measurements from said measuring means and for transmitting the same to said indicating instruments, respectively, and means for changing the speed of said magnetic
  • a textile drafting machine in combination, entrance roll means and delivery roll means; infinitely variable drive means operatively connected to both of said roll means for changing the speed thereof without changing their relative speeds for thus adjusting the rate of delivery; adjusting means operatively connected to said entrance roll means for changing the speed thereof with respect to said delivery roll means for thus adjusting the drafting speed; first measuring means located along the path of movement of a roving to said entrance roll means for measuring the uniformity of the roving to be drafted; second measuring means located along the path of movement of the roving from the delivery roll means for measuring the uniformity of the drafted roving; and adjustable indicating means for simultaneously indicating the uniformity of a portion of the roving to be drafted and the uniformity of the same portion of roving after being drafted regardless of the speed of said roll means, said adjustable indicating means including a pair of indicating instruments, magnetic record-v ing tape means including a pair of recording heads spaced an adjustable distance from each other along the tape of said magnetic recording tape means for respectively recording the measurements
  • a textile drafting machine in combination, entrance roll means and delivery roll means; infinitely variable drive means operatively connected to both of said roll means for changing the speed thereof without changing their relative speeds for thus adjusting the rate of delivery; adjusting means operatively connected to said entrance roll means for changing the speed thereof with respect to said delivery roll means for thus ad'- justing the drafting speed; first measuring means located along the path of movement of a roving to said entrance roll means for measuring the uniformity of the roving to be drafted; second measuring means located along the path of movement of the roving from the delivery,
  • roll means for measuring the uniformity of the drafted roving; and adjustable indicating means for simultaneously indicating the uniformity of a portion of the roving to be drafted and the uniformity of the same portion of roving after being drafted regardless of the speed of said roll means, said indicating means including a moving strip of sheet material, a pair of automatic marking means displaced along said strip in direction of its movement for respectively marking on said moving strip curves corresponding to said measurements taken by said measuring means, respectively, and means for regulating the speed of movement of said strip.
  • delivery roll means in combination, delivery roll means; entrance roll means; intermediate roll means located between said delivery and entrance roll means; variable drive means operatively, connected to said roll means for driving the same and for changing the speed of all of said roll means without changing their relative speed for thus adjusting the rate of delivery; adjustment means for changing the speeds of said entrance and intermediate roll means with respect to said delivery roll means while maintaining the relative speeds of rotation between said entrance and intermediate roll means for thus adjusting the main draft and further ad-. justment means for changing the speed of said intermedi-.
  • first measuring means located along the path of movement of a roving to said entrance roll means for measuring the uniformity.
  • infinitely variable drive means operatively connected to all of the roll means for changing the speed of.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US591498A 1955-06-15 1956-06-14 Test apparatus for textile drafting and spinning machines Expired - Lifetime US2982083A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES44354A DE1011331B (de) 1955-06-15 1955-06-15 Versuchs-Feinspinnmaschine zum raschen Ermitteln optimaler Spinnverhaeltnisse

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US2982083A true US2982083A (en) 1961-05-02

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US (1) US2982083A (fr)
DE (1) DE1011331B (fr)
FR (1) FR1154870A (fr)
GB (1) GB808857A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3869759A (en) * 1973-10-24 1975-03-11 Saco Lowell Corp Drive means for textile sliver drafting assembly
US3877210A (en) * 1972-09-15 1975-04-15 Elitex Zavody Textilniho System for measuring the count and twist of spun yarn in open-end spinning
US3877209A (en) * 1972-09-15 1975-04-15 Elitex Zavody Textilniho System for measuring the draft of open-end spinning machines
US3878671A (en) * 1972-09-15 1975-04-22 Elitex Zavody Textilniho System for measuring the twist of spun yarn in open-end spinning
US4977737A (en) * 1989-04-07 1990-12-18 Howa Machinery, Ltd. Method of controlling the driving of a ring spinning frame

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19625371B4 (de) * 1995-10-11 2008-12-24 Maschinenfabrik Rieter Ag Spinnmaschine mit zentralem Antrieb

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1912946A (en) * 1930-11-26 1933-06-06 Litty Paul Drawing mechanisms in textile machines
US2168449A (en) * 1937-04-16 1939-08-08 Gessner Ernst Ag Ring spinning frame
US2516768A (en) * 1946-04-29 1950-07-25 Zellweger Uster Ag Apparatus for gauging textiles, particularly yarns and sliver
US2671199A (en) * 1950-07-01 1954-03-02 American Viscose Corp Yarn unevenness tester
US2705423A (en) * 1952-06-11 1955-04-05 West Point Mfg Co Strand drafting and tension measuring apparatus

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Publication number Priority date Publication date Assignee Title
DE513177C (de) * 1930-11-22 Siemens Schuckertwerke Akt Ges Vorrichtung zum Anzeigen von Abweichungen in der Fadenspannung fuer Spinn-, Zwirn- oder Spulmaschinen
DE690286C (de) * 1936-06-14 1940-04-20 Paul Litty faehigkeit eines Faserstoffes und zur Herstellung eines Prueffadens
DE689667C (de) * 1937-04-17 1940-03-30 Ernst Gessner Akt Ges Streichgarn-Ringspinnmaschine
DE720200C (de) * 1938-07-01 1942-04-28 Aeg Vorrichtung an Strecken zur Regelung des Verzuges
US2361217A (en) * 1941-01-02 1944-10-24 Us Rubber Co Apparatus for producing highly uniform sliver
US2527208A (en) * 1944-07-27 1950-10-24 Gen Electric Supersonic testing apparatus
CH263324A (fr) * 1947-09-23 1949-08-31 Thorens Hermann Sa Dispositif d'équilibrage des disques de réserve d'un changeur automatique de disques.
DE831378C (de) * 1950-08-22 1952-02-14 Deutscher Spinnereimaschb Ingo Vorrichtung zur Vergleichmaessigung fertiger Wickelwatten
DE900669C (de) * 1951-08-19 1953-12-28 Masing & Co Kommanditgesellsch Verfahren und Einrichtung zum Herstellen eines gleichmaessigen Kardenbandes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1912946A (en) * 1930-11-26 1933-06-06 Litty Paul Drawing mechanisms in textile machines
US2168449A (en) * 1937-04-16 1939-08-08 Gessner Ernst Ag Ring spinning frame
US2516768A (en) * 1946-04-29 1950-07-25 Zellweger Uster Ag Apparatus for gauging textiles, particularly yarns and sliver
US2671199A (en) * 1950-07-01 1954-03-02 American Viscose Corp Yarn unevenness tester
US2705423A (en) * 1952-06-11 1955-04-05 West Point Mfg Co Strand drafting and tension measuring apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877210A (en) * 1972-09-15 1975-04-15 Elitex Zavody Textilniho System for measuring the count and twist of spun yarn in open-end spinning
US3877209A (en) * 1972-09-15 1975-04-15 Elitex Zavody Textilniho System for measuring the draft of open-end spinning machines
US3878671A (en) * 1972-09-15 1975-04-22 Elitex Zavody Textilniho System for measuring the twist of spun yarn in open-end spinning
US3869759A (en) * 1973-10-24 1975-03-11 Saco Lowell Corp Drive means for textile sliver drafting assembly
US4977737A (en) * 1989-04-07 1990-12-18 Howa Machinery, Ltd. Method of controlling the driving of a ring spinning frame

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Publication number Publication date
DE1011331B (de) 1957-06-27
FR1154870A (fr) 1958-04-17
GB808857A (en) 1959-02-11

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