US3685267A

US3685267A - Thread clamping,releasing,and feeding mechanism for spinning apparatus

Info

Publication number: US3685267A
Application number: US718436A
Authority: US
Inventors: Hans Landwehrkamp; Franz Schreyer; Karl Handschuch
Original assignee: Schubert und Salzer Maschinenfabrik AG
Current assignee: Rieter Ingolstadt Spinnereimaschinenbau AG
Priority date: 1967-04-18
Filing date: 1968-04-03
Publication date: 1972-08-22
Anticipated expiration: 1989-08-22
Also published as: DD67334A5; CH463338A; GB1187343A; CS158216B2; BE713844A; FR1568254A; JPS543977B1; DE1685994B1; ES352656A1

Abstract

Rollers for drawing spun thread from spinning apparatus are located closely adjacent to the apparatus outlet. The mouth of an outlet tube may be shaped to terminate close to the nip of the withdrawing rollers and may be flared longitudinally of the roller axes. The withdrawing rollers are normally biased together and are movable out of engagement by a solenoid plunger reciprocated in response to a thread-sensing device to release the thread and provide access to the spinning apparatus outlet. A drive roller, which may be one of the withdrawing rollers, may simultaneously serve several spinning outlets. Individually operable sensors and plungers may disengage from the drive roller individual, drive-roller-engaging withdrawing rollers. One of the withdrawing rollers may be cantilever mounted and its free end beveled to feed automatically thread dropped into the slot formed by the bevel to a position between the pair of withdrawing rollers forming a straight thread stretch between the outlet and thread winding rollers.

Description

United States Patent Landwehrkamp et al.

[ 1 Aug. 22, 1972 THREAD CLAMPING, RELEASING,

AND FEEDING MECHANISM FOR SPINNING APPARATUS [72] Inventors: Hans Landwehrkamp; Franz Schreyer, both of Ingolstadt; Karl Handschuch, Oberhaunstadt, all of Germany [73] Assignee: Schubert & Salzer Maschinenfabrik Aktiengesellschaft, Ingolstadt, Germany [22] Filed: April 3, 1968 [21] Appl.No.: 718,436

[30] Foreign Application Priority Data April 18, 1967 Germany ..Sch 40567 [52] US. Cl ..57/34 R, 57/58.95, 57/80, 5 7/84 [51] Int. Cl......D01h l/12, D01h 13/16, D01h 15/00 [58] Field of Search ..57/34, 58.89-58.95, 57/84, 80, 78, 90

[56] References Cited UNITED STATES PATENTS 2,407,730 9/ 1946 Wethers ..57/90 7 2,952,115 9/1960 Bromley ..57/90 X 3,163,976 l/l965 Juillard ..57/58.89 3,279,667 10/1966 Scragg et al. ..57/90 X 3,354,626 11/1967 Cizek et a1 ..57/78 2,019,673 11/1935 Gow ..57/84 2,482,654 9/ 1949 Cochran et al. ..57/84 X 2,599,256 6/1952 Hartley et a1 ..57/84 3,354,631 11/1967 Elias et al. ..57/58.95

FOREIGN PATENTS OR APPLICATIONS 1,467,507 12/1966 France ..57/58.95

Primary Examiner.lohn Petrakes Attorney-Robert W. Beach 57 ABSTRACT Rollers for drawing spun thread from spinning ap-' paratus are located closely adjacent to the apparatus outlet. The mouth of an outlet tube may be shaped to terminate close-to the nip of the withdrawing rollers and may be flared longitudinally of the roller axes. The withdrawing rollers are normally biased together and are movable out of engagement by a solenoid plunger reciprocated in response to a thread-sensing device to release the thread and provide access to the spinning apparatus outlet. A drive roller, which may be one of the withdrawing rollers, may simultaneously serve several spinning outlets. Individually operable sensors and plungers may disengage from the drive roller individual, drive-roller-engaging withdrawing rollers. One of the withdrawing rollers may be cantilever mounted and its free end beveled to feed automatically thread dropped into the slot formed by the bevel to a position between the pair of withdrawing rollers forming a straight thread stretch between the outlet and thread winding rollers.

7 Claims, 7 Drawing Ilgures P'A'IENTED M22 1912 3 685. 26

SHEET 1 UF 3 I Fig. Iv

in I] BY I 60% 1 THREAD CLAMPING, RELEASING, AND FEEDING MECHANISM FOR SPINNING APPARATUS In continuous-spinning devices the fiber sliver is supplied to a spinning chamber which has an area for collecting fiber from the sliver and binding and twisting it to produce thread. Thread is withdrawn from the spinning apparatus by withdrawing mechanism, usually in the form of pulling rollers, exteriorly of the spinning apparatus. The withdrawing process is continuous so that the spinning apparatus must have an opening in it through which the strand can be withdrawn whether the spinning is accomplished by a cup-shaped rotary chamber such as Shown in copending application Ser.

No. 655,906 of Landwehrkamp and Schreyer, filed July 25, 1967, or by a rotating funnel to which fiber is fed electrostatically as disclosed in French Pat. No. 1,442,699, or by a chamber into which the fiber particles are carried by fiuid and collected by the free-rotating end of a thread, such as disclosed in German Pat. No. 1,062,153.

In all devices of the continuous-spinning type, when the spinning process is stopped or the thread breaks in the spinning apparatus the withdrawing rollers have continued to pull the thread from the machine or, if the rollers are stopped, the tension in the thread caused by the twist being formed in it will cause the thread to spring out of the spinning apparatus when the tension,

. spinning apparatus, the withdrawing mechanism has heretofore been spaced from the spinning apparatus outlet mouth. Consequently, there has been in conventional spinning apparatus a relatively long unguided thread stretch'between the spinning apparatus outlet and the withdrawing mechanism so that a discontinuity of the thread due to a thread break or machine shut down has frequently resulted in the trailing thread end being pulled from the spinning apparatus to dangle uncontrolled from the withdrawing mechanism. In order to start the spinning process again the free end of the thread must be fed back into the apparatus through the opening provided for its withdrawal until its end is again in a position to collect fiber fed to themachine. Effective apparatus for clamping the thread and feeding the thread end back into the spinning apparatus is disclosed in copending application Ser. No. 665,1 18, of

Landwehrkamp et al., filed Sept. 1, 1967. This apparatus, however, requires additional mechanism which makes the spinning machine more complicated mechanically and, therefore, increases theexpense in manufacture and maintenance.

It is therefore a principal of the present invention to provide clamping means for preventing removal of the free thread end from an outlet passage in a continuous spinning machine, either when the spinning machine is stopped or when the thread breaks, 'by modifying conventional spinning components and thereby to simplify the machine mechanism.

It is a further important object to provide such clamping means which substantially reduces the number and complexity of components which has been necessary for previously proposed clamping devices.

It is an incidental object to provide a spinning machine which is more compact than previously known machines.

paratus, which figure includes a diagrammatic representation of circuit controlmeans.

FIG. 4in an end elevation of a different form of clamping mechanism with parts in section.

FIG. 5 is a side elevation. of thread-withdrawing mechanism including clamping apparatus for a plurality of spinning chambers, with parts broken away.

F IG. 6 is an end elevation of still a different form of clamping apparatus.

FIG. 7 is an c'levational detail of a drawing roll which can be used with any of the structures shown in FIGS. 1 through 6.

The restraining apparatus of the present invention is shown in connection with a rotary spinning chamber 2 enclosed in a housing 1 and having a'cover 11. Fiber sliver S is fed to the spinning chamber collection channel 24 through feed rollers 5 and feed tube 51 extending through the cover 11. The spun thread is withdrawn through a withdrawal passage provided within an upright withdrawal tube 6. The thread F is pulled from the spinning chamber 2 through tube 6 by a pair of withdrawing

rollers

3,3 and is wound into a spool 9 by winding roller 8.

Withdrawing rollers

3,3 are located closely adjacent to and directly above outlet 61 of the withdrawal tube. When the spinning machine is stopped for any reason, the withdrawing

rollers

3,3 also stop, but thread F is clamped between the stopped rollers and because there is no space between the withdrawing rollers and tube outlet 61, the rollers will not have pulled such thread out of the tube. Also because such rollers are so close to the tube end the thread will not spring up out of the tube when the spinning tension is released.

In order to prevent removal of the trailing end of the thread from withdrawal tube 6 when the thread breaks, a sensor is inserted in the side of such tube a considerable distance below its outlet 61. The sensor could be a photoelectric device responsive to the absence of a thread stretch between a light source on one side of the tube and a photoelectric cell diametrically opposite the light source. Alternatively, as shown in FIG. 1, a sensor 7 could be provided responsive to a decrease in tension in the thread, which would occur if the thread should break or if the speed of the spinning chamber rotation should be reduced. If the thread tension is decreased,

sensor 7 would complete a circuit with switch contact 7.1 to actuate control 72 and thereby effect deenergization of the spinning apparatus and particularly of the drive for withdrawing-

rollers

3,3. Control 72 might also actuate return mechanism for returning the broken thread end to the spinning chamber collection channel 24 and reenergize the spinning chamber and withdrawing roller drive, for example. The Sequence of operations effected by control 72 would dependon the type of spinning apparatus used, whether it is a rotary spinning chamber, or an electrostatic or pneumatic spinning device, for example. The primary function of control 72 for the purpose of the present invention, however, is immediately to deenergize or disengage the drive for

rollers

3,3 to prevent the trailing thread end from being drawn out of tube 6.

After the withdrawing rollers have been stopped, it is necessary to movethe free thread end down tube 6 until the thread end is located in the spinning chamber 2 adjacent to collection channel 24 so that fiber can again be spun continuously from the thread end. This can be accomplished by reversing the direction of rotation of

rollers

3,3, spool 9 and winding roller 8 for a short time, and then reversing such rollers and spool to rotate in their normal spinning direction when the spinning chamber has attained its normal spinning rotational speed.

To facilitate the thread return, if the thread end is close to the nip of

rollers

3,3 when they are stopped, the outlet end 61 of tube 6 can be shaped as shown in FIGS. 1 and 2. The mouth of the outlet tube is flattened so that, in cross-sectional profile perpendicular to the line of contact I(' of

rollers

3,3, such mouth is tapered inwardly or flared outwardly with the tapered tubewalls having concave curvature complemental to the curvature of the adjacent roller circumference. FIG. 2 is a cross section through tube outlet 61 parallel to roller contact line K of FIG. 1 showing that the outlet is flared outwardly in an axial plane of the tube 6 which plane is parallel to the axes of the two-withdrawing

rollers

3 and 3. Preferably, the widest portion of the flared outlet has an extent parallel to roller contact line K at least twice as great as the distance between such contact line and the rim of the outlet so that, when the end of the thread is located above the outlet rim, the thread end portion below the nip of the rollers will always be of shorter lengththan the width of the outlet opening. With such construction there is virtually no chance that the thread would catch on the outlet rim and slip outside of the withdrawal tube. This construction is particularly important when a thread break occurs too close to the rollers to prevent the thread end from passing between the rollers, or when a different type of thread is to be spun so that the previously spun thread has been pulled completely out of the machine and newstarting thread is to be supplied to the spinning chamber through the withdrawal tube.

As indicated in FIG. 5, a single spinning machine usually includes several spinning stations, each having a spinning chamber from which thread is' withdrawn through a tube 6. In such a multistation spinning machine, one of the withdrawing rollers may be a single continuous drive roller 3 which will frictionally drive individual rollers 3' for each station. Each pressure roller 3' has one end mounted in a beating carried by one end of a swingable arm 391. The other arm end is pivotally supported on a rod 39. A torsion spring 38 connected between rod 39 and arm 391 biases such arm to press its roller 3 into engagement with drive roller 3. Similarly, winding roller 8 is a continuous roller cooperating with individual thread spools 9.

FIG. 3 illustrates a withdrawing roller mounting and thread return mechanism which are simple in construction and operation and which eliminate the necessity for reversing mechanism for the drawing rollers and for winding roller 8 and spool 9. As in FIG. 1, the nip of withdrawing rollers 31, 31' is perpendicular to the axis of withdrawal tube 6 and the rollers are located directly above and close to the tube outlet. Roller 31 is preferably positively driven. Roller 31 is driven by frictional' engagement with roller 31 and is mounted in floating bearings so that such roller can be moved into and out of engagement with roller 31 by reciprocation of the plunger of solenoid 32.

' Thread take-up mechanism is provided in the form of a swingable arm 35 which is normally held in the raised full-line position by an electromagnet 36 attracting an armatureswingable with the arm so that thread F is guided between the

rollers

31,31 and winding roller 8 in an angular path displaced laterally from a straight line joining such drawing rollers and winding roller 8. When sensor 7' engages switch contact 71 to actuate control 72, such control first effects deenergization of

rollers

31,31 and then, after a preset time interval, deenergizes solenoid 32 so that its plunger and roller 31' are moved to the right to release the thread previously clamped between the two withdrawing rollers. Simultaneously or subsequently, electromagnet 36 is 'deenergized by control 72 to release the armature of arm 35- so that such arm will swing down into the broken line position and the thread will assume the straight line position indicated in broken lines in FIG. 3 to provide sufficient reserve thread to return the thread end to the collection channel of the spinning chamber.

When spinning is resumed, solenoid 32 isagain energized to press roller 31 into engagement with roller 31. Mechanism for gradually swinging arm 35 upward againinto its raised position may be provided, or the withdrawing rollers may be started slightly ahead of the winding roller 8 and spool 9 to provide slack to be taken up by swinging arm 35 back into the solid line position.

As in FIG. 5, roller 31 may be a continuous drive roller fora plurality of spinning stations and individual pressure rollers 31', solenoids 32, take-up arms 35 and sensors 7 can be provided for each station so as to be responsive to individual thread breaks and thereby avoid interrupting several spinning stations in response to a break at one station.

It has been found that the withdrawing rollers can be spaced from the withdrawaltube while satisfactorily preventing removal of the thread from the tube without the necessity of providing take-up mechanism between the tube outlet and the withdrawing rollers if the distance between the tube outlet tip and the withdrawing roller contact line K is no more than one-third of the'length of withdrawal tube 6. If the withdrawing rollers are offset slightly from the axis of tube 6, the spinning operation can be more readily observed by an operator. In addition, accessibility to the outlet of the withdrawal tube, such as for machine service, is facilitated if at least one of the rollers is mounted in floating bearings so that it can be moved away from the withdrawal tube, such as shown in FIG. 3.

In FIG. 4 mechanism is shown whereby both withdrawing

rollers

311 and 311 can be moved away from the withdrawal tube 6. Withdrawing roller 311 is mounted on one end of a swinging arm 393, the opposite end of such arm being pivotably mounted by a pin 39' to the machine frame. Roller 311 is mounted on a swinging arm 392, the opposite end of which arm is also mounted on pivot pin 39'. A tension spring 37 connected between swinging

arms

392 and 393 normally biases the rollers into engagement. Withdrawing roller3ll is biased into engagement with a separate fixed drive roller 310, which may drive the withdrawing rollers of several spinning stations, by a tension spring 34 connected between arm 393 and the machine frame. Instead of a pin 39,.a common rod may mount several swinging arm pairs, similar to rod 39 in FIG. 5.

The withdrawing rollers are stopped without stopping roller 310 by disengaging roller 311 from drive roller 310. Such disengagement is effected by a lifting element 33, which may be a solenoid plunger or a fluid-actuated plunger for example. The plunger presses against arm 392, mounting roller 311', to pivot such arm about pivot pin 39'. If arm 392 is swung in a clockwise direction as seen in FIG. 4, spring 37 will pull arm 393 along with arm 392 so that roller 311 is lifted off drive roller 310. As the plunger is further extended to the upper left of FIG. 4, a projection 394 on arm 393 will engage a stop 395 so that continued extension of the plunger will swing arm 392 away from arm 393 to disengage roller 31 1 from roller 311 and thereby release thread clamped by the withdrawing rollers for returning a thread end to the spinning chamber.

In some spinning machines it may not be desirable for the withdrawing roller axes to extend parallel to the axis of a continuous drive roller. For example, it may be desirable to have two or more rows of spinning stations on opposite sides of a single drive mechanism for all-of the withdrawing rollers. F IG. 6 discloses drawing mechanism which would be suitable for spinning stations which are offset from the single drive mechanism. The shaft of one of the pair of rollers 312 is mounted in a fixed bearing and such shaft carries a gear 313 driven by a worm 314 rotated by shaft 310. Consequently, the contact line K of the withdrawing rollers is perpendicular to the axis of drive roller 310. Such an arrangement of the withdrawing rollers also provides better accessibility to the withdrawal tube 6 and its spinning chamber because the withdrawing rollers and their drive mechanism are offset to one side of the station so that the remaining three sides are unobstructed.

When a spinning machine is to be started with a different color or texture of fiber, for example, a starting thread must be supplied through withdrawal tube 6 to the spinning chamber. If each spinning station is provided with at least one withdrawing roller 3 mounted on a cantilever shaft, such as shown in FIG. 5, the starting thread can simply be pulled across the end of the roller into engagement with the drive roller 3 and then pulled axially along the drive roller until the thread is engaged between the two rollers. The thread must usually be pulled in the axial direction until the thread stretch between spool 9 and withdrawal tube 6 assumes a straight line. This starting procedure is facilitated if the straight line position of thread F, as shown in FIG. 5, intersectsthe contact line K of the withdrawing rollers near the free end of a cantilever roller 3' to shorten the axial distance along which the machine operator each withdrawing roller may have a beveled circumferential end to provide a deeper slot.

Alternatively, the thread stretch F spanning from the I winding roller 8 to the outlet of withdrawal tube 6 may be located in the desired spinning position between the rollers .of the withdrawing roller pair by providing means for reciprocating a cantilever withdrawing roller lengthwise of its axis. In the construction in FIG. 5, for

example, arms 391 mounting rollers 3' may be slidable along rod 39 to the left from the positions shown so that the free ends of the rollers would be at-the left of the thread line F.- In supplying a-starting thread to the withdrawal tube, therefore, the operator can simply drop the thread into the tube. Such thread would auto matically assume the position indicated by the broken line F. Cantilever pressure roller 3 would then be shifted axially along rod 39 to the right into the position shown in'FIG. 3. If desired the rollers 3' at all of the stations could be shifted simultaneously by moving rod 39 lengthwise. In the constructions of FIGS. 4 and 6 in which both drawings rollers are cantilever mounted, either one or both of the withdrawing rollers may be axiallyshiftable to locate the thread between the rollers. Preferably the withdrawing rollers are in their spaced thread-releasing positions during such lengthwise shifting. (Further reciprocating lengthwise shifting of the drawing rollers while the thread withdrawal operation may be provided for elimination of extreme wear of a single circumferential line of the withdrawing rollers).

The withdrawing mechanism shown in FIG. 6 further facilitates the starting operation because in this construction the operator need only drop the thread end into tube 6 and lay a stretch of the thread in the flaring groove between the free ends of rollers 312. The axes of the withdrawing rollers are arranged so that the contact line K between them is perpendicular to the common tangent to winding roller 8, spool 9, a thread guide element which may be a roller 81 spaced from roller 8 and'the withdrawing rollers. Such tangent preferably intersects the axis of withdrawal tube 6 at the outlet inclined from their free ends. The withdrawing roller arrangement of the present invention provides a simple construction for clamping thread and thereby maintaining the thread in the withdrawal tube of an open-end spinning machine and can also effect return of the thread toward the spinning chamber in some instances without additional clamping devices. In addition, the arrangement of the present invention is considerably more compact than withdrawing and thread-clamping mechanism which has been provided previously. The mechanism disclosed herein can be readily and effectively used with all open-end spinning machines.

We claim:

1. Thread control mechanism for spinning machines including a thread withdrawal passage for withdrawing thread out of a continuous ringless spinning mechanism and a pair of withdrawing rollers contacting along a line for withdrawing thread through such thread withdrawal passage, wherein the improvement comprises means mounting at least one of the withdrawing rollers in cantilever fashion by one axial end to leave the opposite axial end of such roller free, and the rollers being disposed so that the thread withdrawal passage axis intersects the contact line of the withdrawing rollers for movement of a stretch of thread, extending from the thread withdrawal passage, in a direction transversely of its length past said free axial end of said cantilevermounted roller into position between the withdrawing rollers.

2. The thread control mechanism defined in claim 1, in which the mounting means mounts a cantilevermounted roller with its axis inclined at an acute angle to the axis of the thread withdrawal passage and the axis of the thread withdrawal passage intersects the contact lines of the withdrawing rollers at a location ad.- jacent to the free axial end of such cantilever-mounted roller.

3. Thread control mechanism for spinning machines having a plurality of spinning stations, each station including a thread withdrawal passage for withdrawing thread out of a continuous ringless spinning mechanism and a pair of withdrawing rollers located closely adjacent to such thread withdrawal passage for withdrawing thread therethrough, a drive shaft common to said plurality of spinning stations and driving one withdrawing roller of each pair, the other withdrawing roller of each pair being a pressure roller engageable with the withdrawing roller driven by said drive shaft, and separate disengaging means for each station operable individually initially to withdraw conjointly both of said withdrawing rollers of the pair of withdrawing rollers at a selected spinning station from said drive shaft independently of the withdrawing rollers at the other spinning stations and thereafter to disengage from each other said withdrawing rollers of the withdrawing roller pair at such selected spinning station.

4. Thread control mechanism for spinning machines comprising a plurality of spinning stations, each station including a thread winding means having a thread spool and a winding. roller engageablev with such spool, a

thread withdrawal passage for withdrawing thread out a of a continuous ringless spinning mechanism, a pair of withdrawing rollers contacting along a line and located closely adjacent to said thread withdrawal passage for withdrawing thread therethrough, a thread guide element located between said withdrawing rollers and said thread winding means so that a line connecting said thread withdrawal passage and said thread guide element intersects the roll-contacting line, one of said alill h all ilfill fiiig sfifg eisillil iir 'ii iilfi 3%; fashion by one axial end to leave the opposite axial end thereof free for movement of a stretch of thread in a direction transversely of its length past said free axial end of said cantilever-mounted roller into position between said withdrawing .rollers, and a drive shaft common to said pairs of withdrawing rollers of said plurality of spinning stations, the axes of said withdrawing rollers being perpendicular to the axis of said common drive shaft.

5. The thread control mechanism defined in claim 4, in which .the free axial end of each cantilever-mounted pressure roller has a beveled circumference to facilitate entrance of a thread between such cantilever-mounted pressure roller and the other roller of the pair of withdrawing rollers.

6.- Thread control mechanism for spinning machines comprising a thread withdrawalpassage for withdrawing thread out of a continuous ringless spinning mechanism, and a pair of withdrawing rollers located closely adjacent to the thread withdrawal passage mouth, the mouth of said thread withdrawal passage adjacent to said withdrawing rollers being flared outwardly only in that axial plane of said thread withdrawal passage which is parallel to the axes of said withdrawing rollers and said thread withdrawal passage mouth is not flared in the axial plane of said thread withdrawal passage perpendicular to the axes of said withdrawing rollers.

7. Thread control mechanism for spinning machines comprising a thread withdrawal tube having a passage for withdrawing thread out of a continuous ringless spinning mechanism, and a pair of withdrawing rollers located closely adjacent to said thread withdrawal passage, said thread-withdrawal tube having an end adjacent to said withdrawing rollers located between and conforming to the rounding of the rollers of said pair of withdrawing rollers, said passage being of substantially uniform width throughout its entire length in the axial plane of saidftube perpendicular to the axes of said withdrawing rollers to locate the end of said passage close to the nip of said rollers.

Claims

1. Thread-control mechanism for spinning machines including a thread-withdrawal passage for withdrawing thread out of a continuous ringless spinning mechanism and a pair of withdrawing rollers contacting along a line for withdrawing thread through such thread-withdrawal passage, wherein the improvement comprises means mounting at least one of the withdrawing rollers in cantilever fashion by one axial end to leave the opposite axial end of such roller free, and the rollers being disposed so that the thread-withdrawal passage axis intersects the contact line of the withdrawing rollers for movement of a stretch of thread, extending from the thread-withdrawal passage, in a direction transversely of its length past said free axial end of said cantilever-mounted roller into position between the withdrawing rollers.

2. The thread-control mechanism defined in claim 1, in which the mounting means mounts a cantilever-moUnted roller with its axis inclined at an acute angle to the axis of the thread-withdrawal passage and the axis of the thread-withdrawal passage intersects the contact lines of the withdrawing rollers at a location adjacent to the free axial end of such cantilever-mounted roller.

3. Thread-control mechanism for spinning machines having a plurality of spinning stations, each station including a thread-withdrawal passage for withdrawing thread out of a continuous ringless spinning mechanism and a pair of withdrawing rollers located closely adjacent to such thread-withdrawal passage for withdrawing thread therethrough, a drive shaft common to said plurality of spinning stations and driving one withdrawing roller of each pair, the other withdrawing roller of each pair being a pressure roller engageable with the withdrawing roller driven by said drive shaft, thread-withdrawal disengaging means for each station operable individually initially to withdraw conjointly both of said withdrawing rollers of the pair of withdrawing rollers at a selected spinning station from said drive shaft independently of the withdrawing rollers at the other spinning stations and thereafter to disengage from each other said withdrawing rollers of the withdrawing roller pair at such selected spinning station.

4. Thread-control mechanism for spinning machines comprising a plurality of spinning stations, each station including a thread-winding means having a thread spool and a winding roller engageable with such spool, a thread-withdrawal passage for withdrawing thread out of a continuous ringless spinning mechanism, a pair of withdrawing rollers contacting along a line and located closely adjacent to said thread-withdrawal passage for withdrawing thread therethrough, a thread-guide element located between said withdrawing rollers and said thread-winding means so that a line connecting said thread-withdrawal passage and said thread-guide element intersects the roll-contacting line, one of said withdrawing rollers of each pair being a pressure roller, and means mounting said pressure roller in cantilever fashion by one axial end to leave the opposite axial end thereof free for movement of a stretch of thread in a direction transversely of its length past said free axial end of said cantilever-mounted roller into position between said withdrawing rollers, and a drive shaft common to said pairs of withdrawing rollers of said plurality of spinning stations, the axes of said withdrawing rollers being perpendicular to the axis of said common drive shaft.

5. The thread-control mechanism defined in claim 4, in which the free axial end of each cantilever-mounted pressure roller has a beveled circumference to facilitate entrance of a thread between such cantilever-mounted pressure roller and the other roller of the pair of withdrawing rollers.

6. Thread-control mechanism for spinning machines comprising a thread-withdrawal passage for withdrawing thread out of a continuous ringless spinning mechanism, and a pair of withdrawing rollers located closely adjacent to the thread-withdrawal passage mouth, the mouth of said thread-withdrawal passage adjacent to said withdrawing rollers being flared outwardly only in that axial plane of said thread-withdrawal passage which is parallel to the axes of said withdrawing rollers and said thread-withdrawal passage mouth is not flared in the axial plane of said thread-withdrawal passage perpendicular to the axes of said withdrawing rollers.

7. Thread-control mechanism for spinning machines comprising a thread-withdrawal tube having a passage for withdrawing thread out of a continuous ringless spinning mechanism, and a pair of withdrawing rollers located closely adjacent to said thread-withdrawal passage, said thread-withdrawal tube having an end adjacent to said withdrawing rollers located between and conforming to the rounding of the rollers of said pair of withdrawing rollers, said passage being of substantially uniform width throughout its entire length in the axial plane of said tube perpendicular to the axes of said withdrawing rollers to locate the end of said passage close to the nip of said rollers.