US3813865A

US3813865A - Apparatus for the pickup of thread ends from a bobbin

Info

Publication number: US3813865A
Application number: US00348046A
Authority: US
Inventors: K Hohloch
Original assignee: Zinser Textilmaschinen GmbH
Current assignee: Oerlikon Textile GmbH and Co KG
Priority date: 1972-03-04
Filing date: 1973-04-05
Publication date: 1974-06-04
Anticipated expiration: 1991-06-04
Also published as: GB1432611A; CH554803A; DE2210469A1; FR2225025A5

Abstract

What follows is a description of an improved apparatus for use in a spinning machine for the pickup of thread ends formed by thread breakage. The spinning machine includes at least one spinning station formed essentially of a rotatably mounted spindle and a spool mounted on the spindle. The spool has a thread wound thereon to form a bobbin. The apparatus associated with the spinning machine has a vacuum source, a suction mouthpiece connected to the vacuum source and positioned to lie opposite the bobbin and a drive for reversing the direction of rotation of the spindle after a thread breakage. The apparatus has been improved in order that the reverse rotation of the spindle is carried out at a sufficiently high rotational speed so that the rotational speed and the air stream resulting therefrom act on the thread end and effectively either cause or aid in causing the separation of the thread from the bobbin.

Description

Hohloch June 4,- 1974 APPARATUS FOR THE PICKUP OF THREAD ENDS FROM A BOBBIN [75] Inventor: Kurt Hohloch, Ebersbach, Germany [73] Assignee: Zinser-Textilmaschinen GmbH,

Ebersbach, Germany [22] Filed: Apr. 5, 1973 [21] Appl. No.: 348,046

52 us. (:1. 57/345 [51] int. Cl D0lh 13/14 [58] Field of Search 57/22, 34 R, 34.5, 52,

[56] References Cited UNITED STATES PATENTS 3,149,451 9/1964 Benson et a1. .1. 57/22 3,546,870 12/1970 Schewe et a1... 57/53 X 3,300,961 1/1967 Jones et al. 57/53 X 2,704,430 3/1955 Harris 57/345 X 3,738,094 6/1973 Costales 57/104 X 3,203,634 8/1965 Furst 57/345 X 2,956,389 10/1960 Berberich et al. 57/34.5

Primary Examiner-Donald E. Watkins Attorney, Agent, or Firm-Edwin E. Greigg What follows is a description of an improved apparatus for use in a spinning machine for the pickup of thread ends formed by thread breakage. The spinning machine includes at least one spinning station formed essentially of a rotatably mounted spindle and a spool mounted on the spindle. The spool has a thread wound thereon to form a bobbin. The apparatus associated with the spinning machine has a vacuum source, a suction mouthpiece connected to the vacuum source and positioned to lie opposite the bobbin and a drive for reversing the direction of rotation of the spindle after a thread breakage. The apparatus has been improved in order that the reverse rotation of the spindle is carried out at a sufficiently high rotational speed so that the rotational speed and the air stream resulting therefrom act on the thread end and effectively either cause or aid in causing the separation of the thread from the bobbin.

ABSTRACT APPARATUS FOR THE PICKUP OF THREAD ENDS FROM A BOBBIN BACKGROUND OF THE INVENTION The present invention relates to an apparatus for the pickup of thread ends formed on the bobbins of spinning machines by thread breakage. For simplicity of expression, the assembly of a spool and the wound package of thread thereon will hereinafter be denominated as a bobbin. In particular, the present invention relates to an improved for use with spinning machines having bobbins, the spools of which are mounted on rotating spindles, and a vacuum source with a suction orifice positioned opposite a respective bobbin, with each spindle being automatically reversed from a forward rotation to a reverse rotation after thread breakage so that the end of the broken thread is sucked into the suction orifice.

Such an apparatus is required for the known various embodiments of so-called thread attaching devices which serve to automatically repair thread breakage occurring in ring spinnng machines. For this purpose the thread attaching device is located on a movable carriage which can run along one or both sides of a ring spinning machine or also along the sides of several spinning machines. The thread attaching device runs systematically alongside the machines and seeks out the spinning stations (any of a plurality of rotatable spindles having bobbins mounted thereon) in which thread breakages are present. Means are provided on the carriage which can sense the presence of a thread breakage. As soon as a thread breakage is sensed, the carriage stops at the particular spinning station and the attaching device repairs the thread breakage automatically. Thereafter, the attaching device continues running until it again finds a thread breakage at a spinning station. Since such apparatuses are known per se, they will not be described in all their details in what follows.

A particular difficulty connected with such thread attaching devices is the uncertainty of thread end pickup of a broken thread from a particular bobbin so that the thread may be re-attached to the roving which passes through the drawing mechanism. The removal of such thread ends from the bobbins is difiicult in spinning machines in contrast to spooling machines oryarn machines because the end of the thread carries a leftover portion consisting of free fiber ends which adhere relatively strongly to the bobbin and are only removed with great difficulty.

It is known to pick up thread ends from a bobbin by means of a suction air stream. For this purpose a suction orifice is provided which is connected to a source of vacuum, and is brought to within a short distance opposite the particular bobbin. The spindle carrying the particular bobbin rotates at a very low speed of rotation and in a reverse direction to the normal direction of rotation of the bobbin. This slow reverse rotation of the spindle has as its only purpose to move the entire circumference of the region of the bobbin on which the thread is located, past the suction orifice. However, it has been shown that according to this procedure, even with a very strong suction, the thread ends are not picked up from the bobbin with any degree of certainty. As a result, thread breakage can often not be repaired automatically and it then becomes necessary to have personnel repair the breakage. It is furthermore necessary to have such personnel constantly on the lookout for thread breakage which is not automatically repaired.

In order to increase the certainty of thread end pickup from the bobbin, it is also known to use a rotating brush instead of suction, where the spindle also rotates slowly in the reverse direction. In this case, the brush constantly touches the region of the bobbin where the thread end to be picked up is located, and when the thread end touches the brush, it is released from the bobbin and carried away with the brush. Utilizing a brush, however, has its disadvantages. Among other things, the picked up thread may wind itself onto the brush. This also prevents the automatic repair of the thread breakage. Therefore, there is still not sufficient certainty of repairing each occurring thread breakage automatically with the brush installation.

OBJECTS AND SUMMARY OF THE INVENTION The present invention is based on the realization that sucking in of the thread ends from the bobbin into a suction orifice is of itself nore advantageous than the picking up of the thread ends by means of brushes. This is so because once a particular thread end is sucked into the suction orifice, the thread breakage can be repaired with certainty.

It is, therefore, a general object of the present invention to improve the apparatus of the aforenoted type in such a way that the broken thread ends appearing on the bobbins can bepicked up and sucked into the suction orifice with certainty.

It is a more particular object of the present invention to provide an improved apparatus for use with a spinning machine according to which the spindle of each bobbin on which a thread break is detected is rotated in a reverse direction at a sufficiently high rotational speed so that the rotational speed and the air stream re sulting there-from act on the thread end and effectively cause the separation of the thread from the bobbin.

1 It is another particular object of the present invention to provide an improved apparatus for use with a spinning machine according to which the spindle of each bobbin on which a thread break is detected is rotated in a reverse direction at a sufficiently high rotational speed so that the rotational speed and the air stream resulting therefrom act on the thread end and effectively aid in the separation of the thread from the bobbin.

These and other objects are accomplished according to the present invention in a surprisingly simple way by causing the spindle to be driven at such high rotational speeds in a reverse direction of rotation (that is, in a direction of rotation opposite to that utilized in winding thread onthe spool) by driving means, that the rotational speed and the air stream acting on the thread end effectively cause or aid in the separation of the thread end from its respective bobbin.

According to the present invention, therefore, the reverse rotational rpm of the spindle is set at a sufficiently high level that the thread end, which at first adheres to the bobbin, separates by itself or at most its separation is aided only in small measure by suction from the bobbin. The separation of the thread end is caused solely or at least substantially through the cooperation of the centrifugal force generated by the reverse rotation of the spindle and the air stream conditions prevailing at the circumference of the bobbin during the reverse rotation and acting on the thread end. In the rapid reverse rotation of the spindle, the air stream conditions are such that they tend to cause separation of the thread end from its respective bobbin.

It is essential according to the present invention, therefore, that the spindles operate with such a high reverse rotational speed that the broken thread end is automatically separated from the bobbin, or at least is influenced in such a way that the suction air stream can separate it completely without difiiculty. Since the adherence of the broken thread ends to the bobbin naturally varies within wide limits, it is necessary to pick the reverse rotational speed so high that in a not inconsiderable percentage of thread breakages the effect of the high rotational speed alone will lead to a separation of the broken thread ends from the bobbins.

During the high reverse rotational speed of the spindle, the broken thread end is sucked into the suction orifice of the suction installation with a corresponding high velocity. This suction ingress can be sensed, in a known fashion, and as soon as possible thereafter the reverse rotation is terminated and the thread pinched and cut off in a known manner.

According to the invention, the length of the thread end to be cut is much greater than it is in the described known installations because of the high thread velocity. This disadvantage is far out-weighed, however, by the practically complete certainty of achieving thread breakage repair. One should also consider that thread breakages at individual spinning stations occur only rarely so that thread waste, which is greater in the case of the invention, has pracically no importance when compared to the achieved advantages of, for example, repair certainty. In general, it is even desirable, after thread breakage, to separate a relatively long piece of thread (as was always done in the past by female spinners) because the causes of thread breakage can lie in a deterioration of the thread itself. This deterioration may extend up to several meters (as calculated from the broken thread end). For example, thread breakage can be due to an undesirably lengthy thin portion in the thread. If this is the case, then the necessity of cutting off a longer piece of thread, which cannot be avoided in the invention, is even desirable in known installations of this kind and is achieved without mentionable loss of time. This is so because of the high circumferential velocity of the bobbin at the time of separation of the broken thread end. If this procedure were to be utilized in known installations, an undesirable loss of time would result because of the very low rotational speed of the spindle. As a result, the reverse rotational speed of the spindle would have to be maintained for some time after the separation of the thread. Such a result is clearly undesirable as it leads, as stated above, to loss of time.

The magnitude of the reverse rotational speed of the spindle, which is required according to the present invention can be easily determined on a case by case basis by simply testing each case. In every case, therefore, it is possible to determine a suitable rotational reverse speed for which the separation of the broken thread end and the sucking in of the broken thread end into the suction orifice occurs with the required certainty. For example, in experiments, reverse rotational speed values of 1,500 3,000 rpm, preferably approximately 2,000 rpm, have been found to be particularly suitable to achieve the required degree of certainty.

Depending on the circumstances, however, lower or higher rotational speeds than those specified above can be provided. In some cases, one can even provide with satisfactory results a reverse rotational speed which is equal to the normal forward rotational speed (operational rpm) of the spindle.

In each case, the suction air stream is adjusted to be sufficiently strong so that the separated thread is sucked into the suction orifice with the requisite velocity.

The invention is intended preferentially for ring spinning machines, but it can, depending on circumstances, also be utilized in other types of spinning machines.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates a side elevational view partly in cross section of one station of a spinning machine having a spindle and a bobbin mounted thereon, and a carriage, schematically illustrated by the dashed line, of a thread attaching device positioned opposite the spindle station. The carriage has a spindle drive and thread suction device installed thereon.

FIG. 2 is a top view schematically illustrating one embodiment of a spindle drive according to the present invention.

FIG. 3 is a top view schematically illustrating another embodiment of a spindle drive according to the present invention.

FIG. 4 is a top view schematically illustrating still another embodiment of a spindle drive according to the present invention according to which the reverse drive of the spindle is achieved by means of a tangential belt which also drives the spindle in its normal operation.

FIG. 5 is a top view schematically illustrating yet another embodiment of a spindle drive according to the present invention according to which the reverse drive of the spindle is achieved by a tangential belt which also drives the spindle in its normal operation.

FIG. 6 is an elevational view partly in cross section illustrating further details of the embodiment according to FIG. 5.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Before turning to a specific consideration of the illustrated exemplary embodiments of the present invention, it should be noted that only those portions of the thread attaching devices necessary for demonstrating the present invention are shown. The remaining portions of the thread attaching devices are of a known construction and are not illustrated in order to ensure that the true inventive contribution is not obscured.

FIG. 1 shows one of a plurality of spindle stations of a ring spinning machine, each having a typically constructed spindle 10. Preferably, the plurality of spindle stations are aligned in a row, one next to the other. Each spindle I0 is mounted through a whorl l2 and a bearing housing 13 to a spindle rail 14 in a known manner. All the spindles 10 or a group of the spindles are jointly driven by a tangential belt 11 which adheres to the cylindrical whorls 12 which, in turn, are each mounted for rotation by a journal bearing 57. The bearing housing 13 of each spindle 10 is fixedly installed in the usual fashion in the spindle rail 14. The ring spinning machine, which is not shown in further detail, can be of any known construction. On each spindle 10 there is removably installed a spool 15 and a somewhat more than half-finished wound package of thread 16. For convenience, the spool and wound package of thread 16 will be denominated as a bobbin 16.

In a known manner, the thread is wound on the bobbin 16 by a traveler 18 which revolves on a ring 17. The ring 17, in turn, is mounted on a reciprocating ring bank 20.

Let it be supposed that a thread breakage has occurred at the spinning station shown. The thread which was to have been wound onto the bobbin 16 by means of the traveler 18 revolving on the ring rail 17 is therefore broken and the thread end now lies somewhere on the upper conical region 19 of the bobbin 16 and adheres to the bobbin 16 relatively tightly because of its fiber tuft.

Along one side of the spinning machine a carriage 21 travels in a known fashion. The carriage 21 has a selfactuating thread attaching device of known construction, which is not shown in all its details. In order to catch the broken thread after its separation from the bobbin, the carriage 21 is equipped with a vertically and horizontally adjustable suction mouthpiece 22. The suction mouthpiece 22 is connected to a vacuum source 24 by a schematically indicated line 23. Upstream of the vacuum source 24 there is disposed a'filter 25. Before proceeding further, it should be noted that the up-and-down strokes of the ring bank are, of course, not interrupted during the separation and suction of the broken thread from the bobbin 16 because the other spinning stations still are operating normally. The spindle rail 14, however, is in general stationary with respect to the remainder of the spinning machine.

First, the carriage 21 is arrested, and thereafter the suction mouthpiece 22 is at first moved horizontally to the vicinity of the spindle 10 and is then moved from the top downward into the position shown in which its obliquely inclined slit-like suction orifice 26 lies opposite the conical region 19 of the bobbin 16. The orifice 26 extends over the full height of the conical region 19 and at a small distance from the outer surface thereof.

At least in come cases, it is conceivable to make the suction orifice 26 shorter than the length of the conical region l9'of the bobbin 16, whereby, however, the suction mouthpiece must be moved obliquely up and down, parallel to the conical region of the bobbin, in order to achieve with certainty the sucking in of the broken thread end. Preferably, however, the shown embodiment of the suction orifice 26 is provided.

In order to separate the thread end from the bobbin 16 with certainty, the carriage 21 carries a driven driving roller 27 (friction roller), which is disposed rotatingly on a horizontally displaceable carrier arm 29. The carrier arm 29 is moved to the left in FIG. 1 as far as is necessary until the driving roller 27, which is coated with an elastic coating of rubber or synthetic material, is pressed firmly against the whorl 12 of the spindle l0 and drives this whorl 12 opposite to its normal direction of rotation, i.e. in a reverse direction of rotation from that necessary to wind thread on the bobbin 16.

In this exemplary embodiment, the tangential belt 11 is not lifted or displaced away from the whorl 12 during the reverse driving of the spindle 10, but rather continues to glide further along this whorl. The pressure of the driving roller 27 on the whorl 12, however, is so great that the turning moment imparted to the whorl 12 by the driving roller 27 is considerably higher than the turning moment which the tangential belt 11 imparts to the whorl 12, so that the spindle 10 is driven with the intended reverse rotational speed. This reverse rotational speed is so high, preferably approximately 1,500 3,000 rpm, that the thread end is lifted somewhat from the bobbin 16 by the centrifugal force acting upon it and by the air stream resulting from the high reverse rotation, and thus can be sucked pneumatically into the suction orifice 26 with certainty. This lifting occurs with a wind-off thread velocity which is a function of r the rotational speed.

As shown, the suction mouthpiece 22 has a bent configuration. On its upper side it has a narrow, longitudinal slit 30 which begins at the open end of the suction orifice 26 and extends to the location 31. As a result, the thread end has passed the bend in the direction of the vacuum source, it then runs in the direction shown by the dotted line 32 and in this position a region 33 of the thread extends upwardly from the suction mouthpiece 22. A sensor 34 senses this extension of the thread from the suction mouthpiece 22 in a known manner and triggers an automatic mechanism which can be of a known kind to effect the further repair of the thread breakage. First, a pinch-and-cutting device 35, which is located next to the sensor 34, is activated for pinching and cutting of the thread in a known manner. The thread is cut in close proximity behind the place where it is pinched. It can be provided that simultaneously the driving roller 27 is lifted from the whorl 12 by an appropriate motion of its carrier arm 29 so that the reverse driving of the spindle l0 ceases and the tangential belt 11 at first brakes the spindle 10 very quickly to a standstill, and then drives it again in the normal forward direction. Under the control of an automatic mechanism (not shown), the thread is led to the roving which passes through the drawing mechanism (also not shown) and is re-attached so that the thread breakage has been automatically repaired. After the repair of the thread breakage, the automatic mechanism, which is located on the carriage 21, terminates this functional process and the carriage 21 then again automatically runs alongside the ring spinning machine until such time as the sensing device, which is installed on the carriage for the sensing of the occurrence of a thread breakage, again senses a new thread breakage and stops the carriage 21, at which time the same process is repeated at that particular spinning station.

In the event that the time interval which passes between the activation of the sensor 34 and the reattachment of the thread onto the roving is relatively long, it is suitable not to drive the spindle 10 again immediately in the normal forward direction, but rather at first to wait until the attachment of the thread to the roving, which passes through the drawing mechanism, is imminent. This can be achieved, for example, by not immediately lifting the driving roller 27 from the whorl 12, but rather braking it to a standstill and holding it pressed against the whorl 12 so that the spindle 10 is arrested to a standstill and stays in the stationary condition until after a predetermined time interval, or until after a signal is released in some other way by the automatic mechanism. Thereafter, the driving roller 27 is lifted from the whorl 12.

In FIGS. 2-6, variations of the device of FIG. 1 for the reverse driving of the spindle 10 are shown. 12.

When the carrier arm 29 is again moved away from the whorl I2 for lifting off The driving arrangement according to FIG. 2 differs from that of FIG. I in that in addition to the driving roller 27, an arm 37 is installed fixedly on the carrier arm 29. The arm 37 carries a non-driven rotating roller 39. In some cases, instead of the roller 39, a stationary gliding-edge can be provided. The motion of the carrier arm 29, which serves to press the driving roller 27 against the whorl I2, moves the roller 39 on the glidingedge into such a position that it necessarily lifts the tangential belt II from the whorl 12 for lifting off the driving roller 27, the roller 39 is also lifted from the tangential belt It, so that the tangential belt ll again drives the whorl I2.

The driving mechanism illustrated in FIG. 3 differs from that of FIG. 2 in that the lift off of the tangential belt II from the whorl I2 is effected pneumatically by means of compressed air which exits from a compressed-air nozzle 40 which, in turn, is moved into the vicinity of the point of contact between the tangential belt II and the whorl I2. referentially, it can be provided that the compressed air which exits from the compressed air nozzle 40 is taken from the pressure side of the vacuum source 2% and is transported from the vacuum source 24 to the nozzle 40. In other cases, there can, of course, also be installed on carriage 21 a separate compressed air source for the production of the compressed air. When the driving roller 27 is lifted from the whorl l2, the compressed air nozzle 40 is also moved backwards toward the carriage.

In the exemplary embodiment of FIG. 4, a generally L-shaped lever 43 having

arms

44 and 45 pivots on a carrier arm 29' which, in turn, is movable in the direction of the double arrow A. The carrier arm 29' can be suitably disposed on the carriage 2i of the attaching device or in other cases at the spinning station of the particular spinning machine. The arm 44 has a nondriven roller 41 rotatably mounted thereon, while the arm 45 has a compression spring 47 acting thereagainst. The motion of the carrier arm 29 effects the approach of the roller 31 to the tangential belt I1 and displaces or lifts the belt ill from the whorl 12, while at the same time contacting the whorl 12. In this way, the roller II drives the whorl I2 by virtues of being itself driven by the tangential belt II. The whorl I2 is driven with the same rotational speed at which the whorl l2 was driven by the tangential belt Ill but in the reverse direction from the normal operational direction of rotation. When the carrier arm 29' is moved back to its original position, the roller ll is lifted from the whorl l2 and from the tangential belt II and the whorl I2 and therefore the spindle I is again driven by the belt II in its forward rotational direction.

If the reverse rotational speed of the spindle, as produced by the driving mechanism of FIG. 4, is unnecessarily high, it can be reduced while yet being driven by the belt II by using, instead of a single roller 41 accordingly to FIG. 4, an odd number of wheels or rollers in the form of a reduction transmission. A preferred embodiment of such a transmission 50 is shown in FIGS. and 6. A fork SI is fixedly installed on the movable carrier arm 29', and an arm 52 of the fork 51 carries a non-driven rotatably mounted roller 53 which has internal teeth. The internal teeth mesh with a pinion 54 which is coaxial with a friction roller 55 positively connected thereto which, in turn, rotates freely in the other arm 56 of the fork 51. This friction roller 55 can be pressed against the tangential belt 11 by a suitable motion of the carrier arm 29 in such a way that the tangential belt Ill is lifted from the whorl 12. In this process the roller 53, which carries an elastic cover, is pressed against the whorl l2 and causes it to be driven in a reverse direction. It should be noted that the tangential belt 11 is responsible for this reverse driving. The reduction ratio of the transmission 50 is selected in such a way that the reverse rotational speed of the whorl and consequently the spindle 10 is considerably smaller than its forward rotational speed. For example, the reverse rotational speed can be one-third to onefifth of the forward rotational speed.

In the exemplary embodiments, the roller which effects the reverse driving of the spindle is in each case pressed against the whorl I2 of the spindle at the height of its journal bearing 57 (FIG. I). However, it should be noted that the invention is not limited to this arrangement. Other and different locations of the turnable member of the spindle 10 may be utilized. For example, in FIG. I, the region 59 of the spindle 10 which is located between the whorl I2 and the spool 15 could he used. The latter is particularly suitable when the journal bearing 57 is not positioned at the height of the whorl 12 but rather at the height of the region 59. In any event the effect is the same.

In conjunction with the preferable range of 1,500 3,000 rpm mentioned above, the following ranges should also be noted:

1. A vacuum pressure range equivalent to a column of water 1,000 2,500 millimeters high: This means that the difference pressure between atmospheric pressure and the pressure within the suction mouthpiece 22 can be equivalent to a column of water 1,000 2,500 millimeters high. Therefore, the pressure range equivalent to a column of water 1,000 2,500 millimeters high is not the absolute pressure but the difference pressure.

2 Diameter range of bobbin 16: 4O millimeters.

3. Distance of the orifice 26 from the surface of the bobbin 16: l 20 millimeters.

Finally, it should be noted that the expression spinning machines includes all types of spinning machines which have means for winding up threads, such as ring spinning machines, twisting machines, draw twisting machines or similar machines.

That which is claimed is:

I. In an apparatus for the pickup of thread ends which occur in a spinning machine during thread breakage; the spinning machine including at least one spinning station having a rotatably mounted spindle and a spool mounted on the spindle on which a thread is wound-to form a bobbin, the thread ends occurring on the bobbin; the apparatus associated with the spinning machine including a vacuum source, a suction mouthpiece connected to the vacuum source and positioned to lie opposite the bobbin and means for reversing the direction of rotation of the spindle after a thread breakage; the improvement in said apparatus wherein said means for reversing the direction of rotation of the spindle includes means for driving the spindle in the reverse direction at a sufficiently high rotational speed so that the rotational speed and the air stream resulting therefrom act on the thread end and 9 effectively cause the separation of the thread from the bobbin.

2. The apparatus as defined in claim 1, wherein the rotational speed of the spindle in the reverse direction of rotation is at least 1,500 rpm.

3. The apparatus as defined in claim 1, wherein the rotational speed of the spindle in the reverse direction of rotation is 2,000 rpm.

4. The apparatus as defined in claim 1, wherein the rotational speed of the spindle in the reverse direction of rotation is equal to the operational rotational speed of the spindle in the forward'direction of rotation.

5. The apparatus as defined in claim 1, wherein the means for reversing the direction of rotation of the spindle includes a carriage mounted to move along the spinning machine, and a driven roller installed in said carriage, said carriage carrying the suction mouthpiece.

6. The apparatus as defined in claim 5, wherein said carriage includes means provided thereon which serve to interrupt driving of the spindle in its forward direction during driving of the spindle in its reverse direction.

7. The apparatus as defined in claim 1, wherein the means for reversing the direction of rotation of the spindle includes a driven tangential belt means, a rotatingly disposed non-driven roller and means for pressing said non-driven roller against the surface of the spindle and the surface of said tangential belt means for driving the spindle in its reverse direction.

8. The apparatus as defined in claim 1, wherein the means for reversing the direction of rotation of the spindle includes a driven tangential belt means, a rotatingly disposed non-driven roller, reduction transmission means for connecting the spindle to said nondriven roller, and means for pressing said non-driven roller against the surface of said tangential belt means and connecting said non-driven roller to said reduction transmission means for driving the spindle in its reverse direction.

9. In an apparatus for the pickup of thread ends which occur in a spinning machine during thread breakage; and spinning machine including at least one spinning station having a rotatably mounted spindle and a spool mounted on the spindle on which a thread is wound to form, a bobbin, the thread ends occurring on the bobbin; the apparatus associated with the spinning machine including a vacuum source, a suction mouthpiece connected to the vacuum source and positioned to lie opposite the bobbin and means for reversing the direction of rotation of the spindle after a thread breakage; the improvement in said apparatus wherein said means for reversing the direction of rotation of the spindle includes means for driving the spindle in the reverse direction at a sufficiently high rotational speed so that the rotational speed and the air stream resulting therefrom act on the thread end and effectively aid in the separation of the thread from the bobbin.

10. The apparatus as defined in claim 9, wherein the rotational speed of the spindle in the reverse direction of rotation is at least 1,500 rpm.

11. The apparatus as defined in claim 9, wherein the rotational speed of the spindle of the reverse direction of rotation is 2,000 rpm.

12. The apparatus as defined in claim 9, wherein the rotational speed of the spindle in the reverse direction of rotation is equal to the operational rotational speed of the spindle in the forward direction'of rotation.

13. The apparatus as defined in claim 9, wherein the means for reversing the direction of rotation of the spindle includes a carriage mounted to move along the spinning machine, and a driven roller installed in said carriage, said carriage carrying the suction mouthpiece.

14. The apparatus as defined in claim 13, wherein said carriage includes means provided thereon which serve to interrupt driving of the spindle in its forward direction during driving of the spindle in its reverse direction.

15. The apparatus as defined in claim 9, wherein the means for reversing the direction of rotation of the spindle includes a driven tangential belt means, a rotatingly disposed non-driven roller and means for pressing said non-driven roller against the surface of the spindle and the surface of said tangential belt means for driving the spindle in its reverse direction.

16. The apparatus as defined in claim 9, wherein the means for reversing the direction of rotation of the spindle includes a driven tangential belt means, a rotatingly disposed non-driven roller, reduction transmission means for connecting the spindle to said nondriven roller, and means for pressing said non-driven roller against the surface of said tangential belt means and connecting said non-driven roller to said reduction transmission means for driving the spindle in its reverse direction.

Claims

1. In an apparatus for the pickup of thread ends which occur in a spinning machine during thread breakage; the spinning machine including at least one spinning station having a rotatably mounted spindle and a spool mounted on the spindle on which a thread is wound to form a bobbin, the thread ends occurring on the bobbin; the apparatus associated with the spinning machine including a vacuum source, a suction mouthpiece connected to the vacuum source and positioned to lie opposite the bobbin and means for reversing the direction of rotation of the spindle after a thread breakage; the improvement in said apparatus wherein said means for reversing the direction of rotation of the spindle includes means for driving the spindle in the reverse direction at a sufficiently high rotational speed so that the rotational speed and the air stream resulting therefrom act on the thread end and effectively cause the separation of the thread from the bobbin.

3. The apparatus as defined in claim 1, wherein the rotational speed of the spindle in the reverse direction of rotation is 2, 000 rpm.

4. The apparatus as defined in claim 1, wherein the rotational speed of the spindle in the reverse direction of rotation is equal to the operational rotational speed of the spindle in the forward direction of rotation.

8. The apparatus as defined in claim 1, wherein the means for reversing the direction of rotation of the spindle includes a driven tangential belt means, a rotatingly disposed non-driven roller, reduction transmission means for connecting the spindle to said non-driven roller, and means for pressing said non-driven roller against the surface of said tangential belt means and connecting said non-driven roller to said reduction transmission means for driving the spindle in its reverse direction.

9. In an apparatus for the pickup of thread ends which occur in a spinning machine during thread breakage; and spinning machine including at least one spinning station having a rotatably mounted spindle and a spool mounted on the spindle on which a thread is wound to form a bobbin, the thread ends occurring on the bobbin; the apparatus associated with the spinning machine including a vacuum source, a suction mouthpiece connected to the vacuum source and positioned to lie opposite the bobbin and means for reversing the direction of rotation of the spindle after a thread breakage; the improvement in said apparatus wherein said means for reversing the direction of rotation of the spindle includes means for driving the spindle in the reverse direction at a sufficiently high rotational speed so That the rotational speed and the air stream resulting therefrom act on the thread end and effectively aid in the separation of the thread from the bobbin.

11. The apparatus as defined in claim 9, wherein the rotational speed of the spindle of the reverse direction of rotation is 2, 000 rpm.

12. The apparatus as defined in claim 9, wherein the rotational speed of the spindle in the reverse direction of rotation is equal to the operational rotational speed of the spindle in the forward direction of rotation.

16. The apparatus as defined in claim 9, wherein the means for reversing the direction of rotation of the spindle includes a driven tangential belt means, a rotatingly disposed non-driven roller, reduction transmission means for connecting the spindle to said non-driven roller, and means for pressing said non-driven roller against the surface of said tangential belt means and connecting said non-driven roller to said reduction transmission means for driving the spindle in its reverse direction.