EP2329067B1 - Monitoring method and device for use in the manufacture of core yarn - Google Patents

Description

The present invention is in the field of methods and apparatus for making coregarn.

Devices and methods for producing core yarns have long been known from the prior art. A core yarn is a yarn consisting of a filament (core) and a fiber sheath wrapped around it. The soul is usually made of elastomer, which gives the yarn elasticity.

For a long time, the Applicant has specialized devices on the market in which one or more feed devices are arranged laterally next to or above a drafting system of a ring spinning machine, by means of which a filament is fed to the spinning process in front of the delivery roller of the drafting system. In the spinning process, the filament is spun with the stretched by the drafting fibers of a roving, so that it later forms the soul of the core yarn.

DE19501163 The Zinser Textilmaschinen GmbH was published in 1996 and deals with a drafting system for spinning machines with a guide for feeding a core thread to a laterally changeable in the drafting system roving. The device wants to avoid that the position of the roving in the main drafting field does not coincide with the respective position of the traversing rail as a result of the steering movement with which the roving of the traversing rail follows, so that the core thread is not fed in the intended position of the roving.

DE19815054 the Zinser Textile Machinery GmbH was published in 1999 and relates to a method for producing coregarn, in which a fiber roving refined in a drafting device, before it is solidified by twisting, a core thread is fed in Sheath fibers is embedded. The invention further relates to a spinning machine for producing coregarn with a drafting system, which delivers at least one roving, with a device for supplying a core thread and with a device for rotating and winding the core yarn. The object is to improve the embedding of the core thread in the sheath fibers.

DE102006018073A Spindle factory Suessen GMBH and Rieter Maschinenfabrik AG was published in 2007 and discloses a feed roller for a core thread for producing a core yarn provided with a groove for the core thread. The feed roller can be used in particular for staple fiber-processing drafting systems of textile machines. The groove for the core thread has guide surfaces that open into a groove bottom. The groove base serves for the jam-free positioning of the core thread in the axial direction of the feed roller. The guide surfaces of the track groove are attached to at least two matable parts of the feed roller.

EP1561845 Rieter Maschinenfabrik AG was published in 2006 and deals with a device for the production of fancy yarn. The task is very general in improving and accelerating the manufacturing process of coregarn. The device provides that a core thread (filament) is monitored for breakage prior to combination with the fibers of a roving, so that it is quickly recognized whether a core thread is broken. The monitoring is not specified more precisely and should be possible in any way. Mention may be made of mechanical monitoring which senses the presence of the pre-thread, optical devices which view the core thread, or else capacitive or inductive monitoring. Also, the device should be suitable for checking whether a Corefade meets certain specifications. In one embodiment, the core thread is associated with a roller which rotates with the core thread. Corresponding devices have long been known by the applicant.

FR 2 668 175 of Michael Meyer SA was 1992 publishes and shows a device for interrupting a spinning process. The device is arranged behind a drafting device with respect to the fiber movement.

US 2,047,547 to William Collins became 1936 publishes and shows a separation device for a plurality of fibers. As soon as one fiber breaks down, the separator breaks the supply of other fibers.

U.S. 5,758,482 to Hoover et al. was in 1998 publishes and shows a device which interrupts the further supply of the roving when tearing a yarn which is spun from a roving.

DE 29 24 212 of the Zinser Textilmaschinen GmbH was 1980 publishes and describes a textile machine with a comparatively complicated structure for monitoring the yarn spun from a fiber roving. As soon as the yarn breaks off, we stop the supply of rovings in front of the drafting system and activate a suction device via a lever system.

US 2,153,436 to RC Scholz became 1939 publishes and shows a fiber separation device for several individual fibers. The separator comprises a plurality of knives which act on a second fiber in response to the presence of a first fiber.

The object of the invention is to show a device for monitoring a process for producing a core yarn.

For the production of core yarns, modified ring spinning machines are generally used, in which an additional filament is fed in the area of the delivery rollers of the drafting units, which is spun together with the fibers fed through the drafting system. Each spinning station is equipped for this purpose with a corresponding feeder. One problem is to stop the spinning process in time in case of breakage of the supplied filament.

The known from the prior art devices for producing coregarn have the disadvantage that in a fracture of the filament of the spinning process is usually not immediately interrupted, but may continue undisturbed under certain circumstances. This can result in a lot of rejects being produced because it is not immediately obvious that there is no filament in the yarn. The quality control is also a problem, since usually a yarn from the outside is not considered whether lying inside a filament is arranged.

The applicant of this invention has long known devices which monitor, via an electrical sensor, the movement of the filament guided by a special roller, on the basis of the rotation of the roller, and so confirm if there is a problem with a spinning station. These devices have proven themselves in practice in principle.

An embodiment of the invention discloses another method for monitoring the manufacturing process of a core yarn, respectively displaying a broken filament. Also disclosed is a thread monitoring and separation device (henceforth monitoring device) for carrying out the method.

A filament, which forms the core of the core yarn after the spinning process, is guided past a deflection roller of the monitoring device during spinning (normal operation) under a certain tension adapted to the dimensions of the filament, which thereby acts against the force of a spring and / or gravity a first (raised) position is brought and so keeps a separator open. Depending on the field of application, one or more other deflection elements, for example in the form of eyelets, etc. may be used instead of a deflection roller. It should be noted that the response is not adversely affected. The pulley is operatively connected via a mechanical connection with a normally arranged in the inlet region of the drafting separation mechanism which acts there on the supply of fiber roving and interrupts them if necessary. In the event of a break or marked drop in the tension in the filament, the deflection roller is brought into a second position, for example due to gravity and / or the force of a spring, as a result of which the separation mechanism begins to act on the roving and likewise feeds it into the corresponding spinning station is interrupted, so that the spinning process at the affected spinning station comes to a standstill. The separation mechanism may be a blade which is self-locking, so that the fibers of the roving are separated with a minimal external force as a result of the conveying action of the drafting system. Alternatively or additionally, individual rollers or pairs of rollers provided with a self-locking / self-braking mechanism can be used, which act on the roving, if necessary, and prevent its supply. For example, it is possible to use a pawl acting on a roller or a pair of rollers, which does not engage in normal operation due to an operative connection with a deflection roller of the filament. As soon as the filament is no longer sufficiently tensioned or tears, the pawl engages and thus blocks the actively connected roller or the pair of rollers, so that the further supply of the roving is stopped. To increase traction, the rollers can be actively pressed against each other. It is also possible to provide the rollers with a corrugated and / or rubberized surface. Another possibility is to use two rollers that are designed eccentrically.

In one embodiment, the deflection roller is operatively connected via a rocker with the separation mechanism. The mechanism is balanced so that the operating voltage of the filament is sufficient to bring the separation mechanism in the first position. The separation mechanism consists of a self-locking blade, which is rotatably mounted about an axis and acts obliquely from the top against the flow of the fibers on this. Balance weights or other tare means serve to adjust the necessary lifting force to hold the blade in the open position. If necessary, the length of the lever arm can be adjusted. After falling below a defined load level of the separation mechanism causes a suppression of the further fiber supply. In certain embodiments, a biased mechanism may be provided which is triggered when the operating voltage of the filament falls below a defined load level.

So that in addition to the production of core yarn and normal yarn without internal filament can be produced on a ring spinning machine, it is possible to provide the monitoring device with a locking device by means of which the separating device can be kept in the open position. One possibility is to provide a detent element or a latch which can be inserted or folded as required to block the movement of the blade in the open position.

The device is not only suitable for use on ring spinning machines, but also on other spinning machines suitable for the production of core yarn.

Advantages of the invention are that it has a very simple, if necessary purely mechanical structure, inexpensive to manufacture and relatively insensitive to environmental influences and therefore can be operated under virtually all environmental conditions. Another advantage is that the invention can be retrofitted to already existing spinning devices for the production of core yarn. Appropriate sets can be offered in the form of retrofit kits (kit).

An embodiment of the invention relates to a monitoring device for producing coregarn. The monitoring device comprises a front deflection roller for deflecting a filament, which is usually arranged above the delivery rollers of a drafting system and the precise feeding of the filament is used for a spinning process.

In the inlet area of the drafting system, a separating device is arranged which has a rear deflection roller for deflecting the filament. The separating device serves to prevent the inflow of fibers into the drafting system as a function of the stress level of the filament and / or the presence of the filament. The front pulley and separator may be attached to a traverse rail of the spinner so that they are laterally deflected back and forth during the spinning process. The rear pulley is advantageously arranged obliquely above the drafting system. Other embodiments with only one pulley are possible. In one embodiment, the separation device has a rear deflection roller which is operatively connected to a blade which serves to interrupt the fiber flow. In one embodiment, the rear diverting pulley and the blade are operatively connected via a rocker rotatably mounted about an axis. If necessary, the length of the lever arm can be designed adjustable. The moving parts are advantageously balanced so that the forces on the filament remain below a critical level. Advantageously, the blade is self-locking with respect to the fibers being fed, so that the fibers, as a result of their movement, draw the blade into contact with the stream of fibers upon contact. As a result, only minimal external forces are necessary to prevent the fiber flow. Another embodiment of a separating device includes a pawl which acts on a roller or a pair of rollers. The pawl is operatively connected to the guide of the filament, eg a pulley or diverter, and does not engage under normal operating conditions when the filament is present and sufficiently tensioned. As soon as the filament breaks or is no longer sufficiently tensioned, the pawl engages and stops the further fiber supply to the drafting system, so that the spinning process comes to a standstill. The separator can with an inlet channel be equipped, which is arranged in front of the blade seen in the direction of fiber travel. If required, the separator may comprise a condenser for feeding the fibers to a drafting system. If required, the separating device may comprise sensors which detect the position of the blade, the rotational speed of the rear diverting pulley and / or the fiber volume flowing through the condenser. The rear and / or the front deflection roller may be provided with an optical marking, which visually indicate the rotation of the deflection roller. If necessary, the rear and / or the front guide roller can be arranged perpendicular to the conveying direction of the yarn (in the axial direction) adjustable so that the device is precisely adjustable and thus also suitable for the processing of very thin yarns. In particular, the front deflection roller can be designed so that it is adjustable in position during operation.

If required, the device according to the invention can be provided in the form of a kit for retrofitting an existing spinning device. The kit includes at least one of the described separation devices configured to be compatible with an existing spinning device. The kit contains as needed a front guide pulley which serves to feed a filament to a spinning process in the delivery area of a drafting system. Also can be included by means of the front pulley above the delivery area, if necessary, adjustable, can be positioned.

A process for monitoring a production process of coregarn has the following simplified process steps: a. Providing a separating device which is arranged in the inlet region of a drafting system of a spinning machine and has a rear guide roller, which is operatively connected to a blade which is suitable for interrupting the supply of a roving to the drafting system; b. Deflecting a filament, which later forms the core of a core yarn, over the first rear diverting pulley, wherein the pretensioning pitch of the filament is maintained above a defined stress level, such that the rear diverting pulley deflects due to the stress level, thereby operatively connected blade is brought into an open position; c. Spinning the fibers drawn with the filament into a core yarn by feeding the filaments in the area of the delivery cylinders of the drafting system to the fibers from the drafting system and then twisting the fibers and the filament into a yarn.

Fig. 1

eine Überwachungsvorrichtung von schräg vorne und oben;

Fig. 2

die Überwachungsvorrichtung von schräg hinten und oben;

Fig. 3

die Überwachungsvorrichtung in Produktionsstellung;

Fig. 4

die Überwachungsvorrichtung gemäss Figur 3 in Trennstellung;

Fig. 5

die Überwachungsvorrichtung von schräg hinten mit angehobener Umlenkrolle;

Fig. 6

den Aufbau einer Trennvorrichtung;

Fig. 7

eine zweite Ausführungsform von schräg hinten;

Fig. 8

die zweite Ausführungsform von schräg vorne;

Fig. 9

eine dritte Ausführungsform montiert auf einem Streckwerk.

On the basis of figures, which represent only embodiments, the invention will be explained in more detail below. Show it

Fig. 1

a monitoring device obliquely from the front and from the top;

Fig. 2

the monitor from obliquely behind and above;

Fig. 3

the monitoring device in production position;

Fig. 4

the monitoring device according to FIG. 3 in disconnected position;

Fig. 5

the monitor from obliquely behind with raised pulley;

Fig. 6

the construction of a separator;

Fig. 7

a second embodiment of obliquely behind;

Fig. 8

the second embodiment of obliquely from the front;

Fig. 9

a third embodiment mounted on a drafting system.

FIG. 1 shows two identical monitoring devices 1, 2, which are grown on both sides of a drafting system 3 of a spinning machine, not shown. Each monitoring device 1, 2 operates a spinning station. The drafting system 3 is a well-known from the prior art device that will not be explained in detail at this point. FIG. 2 shows the monitoring devices 1, 2 and the drafting system 3 according FIG. 1 from diagonally behind and above. FIG. 3 shows the monitoring device 1 from the side in the production of a core yarn 4 (production or spinning position). FIG. 4 shows the monitoring device 1 in the locked position. FIG. 5 shows the same device with upwardly folded front pulleys 5 and FIG. 6 shows the components of a separator 8 which is part of a monitoring device 1, 2. In the individual figures, the same reference numerals are usually used for the same components / areas.

This in FIG. 1 shown drafting 3 is used for processing and delivery of fibers 6 at two spinning stations (not shown in detail). The fibers 6 are fed to the drafting system 3 in the form of a roving 6. The drafting unit 3 has, per spinning station, a pair of delivery rollers 7 which serve to deliver the fibers 6 drawn and conditioned by the drafting system 3 to the respective spinning station. The fiber flow is in FIG. 1 represented schematically by the arrows P1, P2.

In the embodiment shown, the monitoring device 1 has a front deflection roller 5, which is arranged above the spinning cylinder 7 during the spinning operation (viewed from the side) above and slightly obliquely. Depending on the embodiment, the front deflection roller 5 is optional and can be avoided if necessary, or replaced by another deflection means, for example a Umlenköse (not shown in detail). The monitoring device 1 further comprises a separating device 8, which, in the embodiment shown, comprises a rocker 10 fixed to a holding frame 9, which carries a rear deflecting roller 11 at its rear free end. At the front end, the rocker 10 has an obliquely rearwardly directed blade 12. Depending on the embodiment and spinning machine, the rear guide roller 11 and the blade 12 can also be indirectly operatively connected. The rocker 10 is in a bearing 13 about the axis of rotation 14 in a certain range stored without rotation. The axis 14 is aligned in the embodiment shown in the y-direction, but depending on the desired kinematics, if necessary, also have a different angle / orientation.

In the production operation, a filament 15 is shown schematically by arrow P7 (cf. FIG. 3 ) - supplied and first deflected over the rear guide roller 11 and then over the front guide roller 5, before it is fed via the delivery cylinder 7 to the spinning process. Depending on the design and desired goal, the filament can also be fed to the delivery rollers. If required, more than one filament 15 per spinning station can be supplied. The monitoring device 1 may be equipped with more than one separating device 8 for this purpose. Alternatively or in addition, a separating device 8 may be equipped with more than one blade 12.

The filament 15 is maintained at or above a defined stress level sufficient to lift the rocker 10, the rear diverting pulley 11 and the blade 12 - shown schematically by arrows P4 and P5 - and to hold them in an open position (see FIG and others FIGS. 1 ), so that the fibers of the roving 6, as indicated by arrow P1, can freely enter the drafting system 3. The separating device 8 is arranged in the embodiment shown behind the drafting 3 in the inlet region thereof. Depending on the spinning device, the positioning can be adjusted.

FIG. 4 shows the monitoring device 1 in the locked position. In the absence of filament, the rocker 10 and the blade 12 move in the locked position - shown schematically by arrows P8 and P9. In this case, the blade 12 is pressed against the lower surface of the holding frame 9, so that the supply of the fibers 6 to the drafting system 3 is suppressed. This prevents that the spinning process can be continued with no existing filament.

The structure of a separating device 8 is in FIG. 6 shown. The separating device 8 has a holding frame 9, to which a rocker 10, which is rotatable about a rotation axis 14, is arranged via a bearing 13. At the rear end of the rocker 10, a rear guide roller 11 is rotatably mounted. At the opposite end of the rocker 10 is operatively connected to a blade 12, which is arranged here obliquely behind. A cover 17 with a fiber guide channel 18 can be snapped onto the axle 13 and the holding frame 9 from behind. The cover 17 is weighted with a weight 19, which holds the cover in a lower position during normal operation. Alternatively or in addition, a locking element can be used, which holds the position. For inserting the roving 6 (see. FIGS. 1 and 3 ), the cover 17 can be folded around the axis of rotation 14 upwards. The fiber guide channel 18 prevents the fibers can run uncontrollably in the separator 8. In the area where the fibers leave the separating device 8, a capacitor 16 is arranged, which ensures that the fibers directed into the drafting system 3 (see. FIGS. 1 and 3 ) . The holding frame 9 has fastening means 19, by means of which the separating device 8 together with the front guide roller 5 on an existing traversing rail 20 (see. FIGS. 1 to 5 ) can be attached to a spinning machine. The components of the separator 8 can be inexpensively manufactured by injection molding of plastic. Another possibility is to form the components from sheet metal. In the FIGS. 3 and 4 It can be seen how the capacitor 16 opens in the embodiment shown between the rollers of the drafting system 3.

The monitoring device 1 works in a simplified manner and as, inter alia, in the FIGS. 3 and 4 shown as follows: the filament 15 is fed via the rear and front guide rollers 11, 5 and the delivery rollers 7 of the drafting 3 a spinning process. By keeping the filament 15 at or above a defined stress level during the spinning process, the rear deflection roller 11, which in the illustration shown is located approximately above the inlet of the drafting system 3, is raised. At the same time opened over the rocker 10 with the rear guide roller 11 operatively connected blade 14 so that the fibers 6 pass unhindered between the support frame 9 and the blade 14 and can enter through the condenser 10 in the drafting system 3. The open position is defined by a mechanical stop, which is given here by an edge of the holding frame 9. As soon as the tension level of the filament falls below a certain level or the filament breaks completely, the rocker 10 and with it the blade 14 snap down and inhibit the supply of the fibers 6 to the drafting system 3. This stops the spinning process at the affected spinning station. Since the blade 14 is directed towards the rear, against the flow of the fibers 6, their action is supported by the movement of the fibers 6, so that only a comparatively small initial force is necessary to interrupt the supply of the fibers 6. The movable parts 10, 11, 14 of the separating device 8 are balanced with advantage with respect to the axis 14 so that the necessary force to lift the moving parts, which is applied by the filament 15, no negative stress result. In order to start the spinning process again, the rocker 10 (depending on the embodiment) together with the blade 14 and the deflection roller 11 can be folded up about the axis 14, so that the fibers of the roving 6 can again be fed to the drafting system 3 ,

FIG. 5 shows the monitoring device 1 and the drafting 3 from obliquely behind. As can be seen particularly clearly here, the front deflecting rollers 5 are arranged on arms 21, which are pivotable upwards about a pivot axis 23. The arms 21 are attached to a common arm support 22, which is also attached to the traversing rail 20, so that the arms 21 together with the separating devices 8 during the spinning process by the traversing rail 20 controlled to move laterally back and forth. If necessary, the arm holder 22 and / or the arms 21 and / or the front guide rollers 5 may comprise further electronic or mechanical sensors which serve to monitor the process. Also, the separator 8 may be equipped with sensors, for example, information about the tension of the filament 15, the position of the rocker 10, respectively the blade 14, the rotational speed of the rear guide roller 11 or the volume of the flowing through the capacitor 16 fibers 6 give.

In the embodiment shown, the front deflection rollers 5 have optical characteristics in the form of a star-shaped pattern 24, which indicates the rotation of the deflection rollers in the spinning mode, so that it is easy to detect if a problem arises with a spinning station.

The FIGS. 7 and 8 show a further embodiment of a separator 8 for a monitoring device of the type described from obliquely behind ( FIG. 7 ) and diagonally in front ( FIG. 8 ). The separator 8 has substantially the same structure and the same operation as those in the FIGS. 1 to 6 shown embodiments, so that reference is made to the understanding of the operation of the description of these figures. The separating device 8 has a rocker 10 which is fastened to a holding frame 9 and which carries at its rear free end a rear deflecting roller 11 which is held by a wire bow 25.

The holding frame 9 is formed in the embodiment shown from sheet metal and has a torsionally rigid construction, which withstands the considerable forces occurring during the separation of the roving (not shown). The holding frame 9 has a base plate 31, an upwardly projecting pillar 32 and a laterally inwardly projecting and arranged above the base plate 31 cross member 33. Reinforcing ribs 27 are integrally formed and serve to increase the stability. The front end of the rocker 10 forming blade holder 26 is made here by injection molding of plastic. The blade 12 is inserted from the front into the blade holder 26. Other embodiments are possible. If necessary, the blade and the blade holder can be made in one piece from sheet metal or other suitable material.

At the front free end, the rocker 10 has an obliquely rearwardly directed blade 12. The rocker 10 is rotatably mounted on the cross member 33 in a bearing 13 about the rotation axis 14 in a certain range. The axis 14 is aligned in the embodiment shown in the y-direction, but depending on the desired kinematics, if necessary, also have a different angle / orientation.

On the cross member 33, a displaceable in the lateral direction (y-direction) locking element 34 is arranged, by means of which the rocker 10 can be locked in a rear position, so that the blade 12 remains open and no longer on the fibers of a roving (see. FIG. 1 ) acts. The locking element 34 has laterally a notch 35, which in the open position of the rocker 10 behind the wire hanger 25 and thus can lock.

Except for the holding frame 9, the components of the separating device are symmetrical, so that they can be used if necessary on both sides of a drafting system. Other embodiments are possible.

The cover 17 is also made of plastic here and has at the rear end two juxtaposed fiber guide channels 18 for receiving Faserlunten (not shown in detail) during operation. Inside is a weight 19 (not directly visible in the illustration shown) which moves the cover 17 down. The cover 17 is snapped onto the axis of the rocker 10 in the embodiment shown. If required, it can be mounted about a separate axis of rotation which is arranged parallel or at an angle to the axis of rotation 14 of the rocker 10.

The holding frame 9 is attached to a traversing rail 20 only partially shown. An inserted in two opposing grooves 28 and in the longitudinal direction (y-direction) of the traversing rail 20 slidable sliding block 29 serves as an abutment opposite to the holding frame 9 can be clamped by a laterally arranged screw 30.

At the end seen in the direction of the fiber end, a capacitor 16 is mounted on the support frame 9, which serves for channeling and controlled introduction of the fibers of the roving in a drafting system. For the general description is on the FIGS. 1 to 5 referenced in which a straightener and a roving are shown. The capacitor 16 is made of plastic in the embodiment shown and snapped onto the support frame 9 so that it can be replaced if necessary. Other embodiments are possible.

FIG. 9 shows a monitoring device 1 and a drafting 3 from obliquely front and top. The separation devices 8 substantially correspond to those in the FIGS. 7 and 8 shown embodiments, so that their operation will not be described in detail.

The front guide rollers 5 are arranged on swivel axes 23 upwardly pivotable arms 21. The arms 21 are also attached to the support frame 9 in the embodiment shown, resulting in a simplified structure and a simpler adjustment. The holding frame 9 have for this purpose a holding means 36 on which the arms are pivotally mounted upward. The arms 21 are thus moved together with the separating devices 8 during the spinning process by the traversing rail 20 controlled laterally back and forth. The lower position is defined by an inwardly projecting pin 37, which serves as a mechanical stop by cooperating in working position with the upwardly projecting pillar 32. If necessary, the pivotable arms 21 and / or the pin 37 may be configured adjustable so that the position of the front guide roller 5 can be adjusted to meet different requirements. If necessary, both the rear and the front pulleys 5, 11 in the lateral direction, resp. Be arranged adjustable transverse to the direction of fiber travel, so that the yarn can be optimally adjusted.

LIST OF REFERENCE SIGNS

1 monitoring device 20 Traversing rail 2 monitoring device 21 Arm (front pulley) 3 drafting system 22 arm bracket 4 core yarn 23 swivel axis 5 Front pulley 24 mark 6 Fibers, roving 25 wire hanger 7 Ablieferwalzen 26 blade holder 8th separating device 27 reinforcing rib 9 holding frame 28 groove 10 seesaw 29 sliding block 11 Rear pulley 30 screw 12 blade 31 baseplate 13 camp 32 pier 14 axis 33 crossbeam 15 filament 34 blocking element 16 capacitor 35 score 17 cover 36 holding means 18 Fiber guide channel 37 attack 19 Weight

Claims (18)

1. Monitoring device (1) for monitoring manufacture of core yarn composed of a filament (15) and fibers (6) wound around same, having

   a. a separating device (8), situated in the inlet of a drafting system (3), having a rear deflection element (11) for deflecting the filament (15), and a separating mechanism (12) which is mechanically connected to the rear deflection element (11), the separating device (8) being used to prevent the flow of fibers (6) into the drafting system (3) as a function of the tension level of the filament (15), in that

   b. above a defined tension level, the rear deflection element (11) is lifted against a force into an open position in which fibers (6) flow in a fiber sliver to the drafting system (3), and

   c. when the tension level falls below the defined tension level, the rear deflection element (11) is moved by the force into a position in which the flow of fibers (6) into the drafting system (3) is interrupted by the separating mechanism (8) due to the action of the separating mechanism (12) on the fiber sliver;

   d. wherein the drafting system (3) has a delivery roller (7) which is suitable for delivering the fibers (6), drafted and prepared by the drafting system, to a respective spinning station, the filament (15) being suppliable to the fibers (6) in the area of the delivery rollers (7).
2. Monitoring device (1) according to Claim 1, characterized in that the rear deflection element (11) is situated obliquely above the drafting system (3), and a front deflection element (5), situated above delivery rollers (7) of the drafting system (3), is provided for deflecting the filament (15).
3. Monitoring device (1) according to Claim 1 or 2, characterized in that the front deflection element and/or the rear deflection element (5, 11, respectively) is/are a deflection roller or an eyelet.
4. Monitoring device (1) according to Claim 2 or 3, characterized in that the front deflection element (5) and the separating device (8) are attached to a cross-winding bar (20) of the spinning device, so that during a spinning process of the spinning device the front deflection element and the separating device are moved back and forth with lateral deflection.
5. Monitoring device (1) according to one of Claims 2 through 4, characterized in that the front deflection element (5) is fastened to an upwardly foldable arm (21).
6. Monitoring device (1) according to one of the preceding claims, characterized in that the front deflection element and/or the rear deflection element (5, 11, respectively) is/are situated so as to be adjustable transverse to the fiber running direction.
7. Monitoring device (1) according to one of the preceding claims, characterized in that the separating mechanism of the separating device (8) has a self-locking means (12) which prevents the fiber flow to the drafting system (3) as a function of the presence of the filament (15) and/or the tension in the filament (15).
8. Monitoring device (1) according to Claim 7, characterized in that the separating mechanism has a blade (12) which is in mechanical operative connection with the rear deflection element (11) and which is used for interrupting the fiber flow to the drafting system (3).
9. Monitoring device (1) according to Claim 8, characterized in that the rear deflection element (11) and the blade (12) are operatively connected via a rocker (10) which is situated so as to be rotatable about an axis (14).
10. Monitoring device (1) according to Claim 9, characterized in that the moving parts (10, 11, 12) of the separating device (8) are counterbalanced.
11. Monitoring device (1) according to one of Claims 7 through 10, characterized in that the separating device (8) has an inlet channel (18) which is situated in front of the self-locking means (1 2), viewed in the fiber running direction.
12. Monitoring device (1) according to one of Claims 7 through 11, characterized in that the separating device (8) has a condenser (16) which is used for supplying the fibers (6) to the drafting system (3).
13. Monitoring device (1) according to one of Claims 8 through 10 or Claims 11 or 12, when dependent at least on Claim 8, characterized in that the blade (12) is situated in a self-locking manner.
14. Monitoring device (1) according to one of Claims 7 through 13, characterized in that the self-locking means (12) includes a roller or a pair of rollers having a detent catch.
15. Monitoring device (1) according to Claim 7, characterized in that the self-locking means (12) includes a mechanism which is pretensioned against the force of a spring.
16. Method for monitoring a manufacturing process of core yarn composed of a filament (15) and fibers (6) wound around same, having the following method steps:

    a. Providing a separating device (8) which is situated in the inlet area of a drafting system (3) of a spinning machine, and which has at least one deflection element (11) which via a mechanical connection is operatively connected to a separating mechanism (12) that is suitable for interrupting the supply of a fiber sliver to the drafting system (3);

    b. Deflecting a filament (15), via the at least one deflection element (11), above a defined tension level of the filament (15) in such a way that the at least one deflection element (11) is deflected due to the tension level of the filament (15), and the operatively connected separating mechanism (12) is thus brought into an open position;

    c. Spinning the fibers (6), drafted by the drafting system (3), and the filament (15) to form a core yarn, in that the filament (1 5) is supplied to the fibers (6) in the area of the delivery rollers (7) of the drafting system (3), and the fibers (6) and the filament (15) are subsequently twisted into a yarn;

    d. Preventing the flow of fibers (6) into the drafting system (3) as soon as the tension level of the filament (15) falls below the defined tension level, and thus bringing the separating mechanism (12) into a position in which it acts on the fiber sliver and interrupts the supply thereof, so that the spinning comes to a standstill.
17. Method according to Claim 16, characterized in that the blade (12) prevents the fiber flow to the drafting system (3) as soon as the tension level of the filament (15) has fallen below a defined level, or the filament (1 5) is no longer present.
18. Method according to one of Claims 16 or 17, characterized in that the supply of the filament (15) is visually indicated by a co-rotating marking (24) on a deflection roller (5).

Images