WO2018073119A1

WO2018073119A1 - Method and device for the detecting failure of supply during the production of complex core yarns

Info

Publication number: WO2018073119A1
Application number: PCT/EP2017/076190
Authority: WO
Inventors: Christian FINKEN; Killian Grunder
Original assignee: Amsler Tex Ag
Priority date: 2016-10-19
Filing date: 2017-10-13
Publication date: 2018-04-26
Also published as: CN110114522B; EP3529402A1; CN110114522A

Abstract

The invention is directed to a monitoring device (1) for monitoring of the manufacturing of a core yarn in a ring spinning device (2) and a method for the production of a complex core yarn. The monitoring device comprises a housing (3) with an actuator (4) arranged displaceable in a first direction (x) in the housing (3) between a locked first position and an unlocked second position. A trigger mechanism (5) comprises a trigger element (6) displaceable in a second direction (z) having a latched first position locking the actuator (4) in the locked first position and an unlatched second position releasing the actuator (4) to the unlocked second position. The trigger element (6) is foreseen to interact with at least one monitoring element (10) indicating the absence of a filament.

Description

METHOD AND DEVICE FOR THE DETECTING FAILURE OF SUPPLY DURING THE PRODUCTION OF

COMPLEX CORE YARNS

FIELD OF THE INVENTION

The present invention is directed to a method and a device for the manufacturing of complex core yarn in particular monitoring of manufacturing of core yarns with at least one filament.

BACKGROUND OF THE INVENTION

WO10006955A1 published on 21 .01 .201 0 by the same applicant relates to a mechanical monitoring device for the manufacture of core yarn. The monitoring device comprises a front deflecting roller for deflecting a filament. The deflecting roller is arranged above the delivery rollers of a drawframe. A severing device is arranged at the entry of the drawframe and having a rear deflecting roller for deflecting the filament. The severing device serving for preventing the inflow of a roving into the drawframe as a function of the tension level of the filament. E.g. when the filament breaks the inflow of the roving into the drawframe is stopped. The severing device may comprise a self-locking means which presents the roving inflow to the drawframe as a function of the presence of and/or the tension in the filament. The severing device may have a rear deflecting roller operatively connected to a blade which serves for interrupting the roving inflow to the drawf rame. The rear deflecting roller and the blade may be operatively connected via a rocker arranged rotatably about an axis. The self-locking means may comprise a roller or a pair of rollers with a latching pawl which is operatively connected mechanically to the guide of the filament. Furthermore the self-locking means may comprise a mechanism pretensioned counter to the force of a spring.

W016092126A1 , published on the 1 6.06.201 6 by Pinter Caipo, discloses a monitoring device for the manufacture of a core yarn. The device is foreseen to interrupt the supply of a roving when a filament breaks during the process of spinning a core yarn. The device comprises a self-locking means arranged to be inserted between a pair of rollers for supplying the roving, thereby interrupting the supply of the roving by acting upon on said rollers. The device comprises a mechanism which is pretensioned against the force of a spring. US3388544A, published on the 1 8.06.1 968 by the Hamel AG relates to a device for simultaneously monitoring the tension in two or more threads delivered by separate feeders to a twisting station. Each feeder has an associated, separate thread guard in the form of a biased switch arm engaging the respective thread. Upon rupture of any thread, the corresponding switch arm shifts a common control member into an off-normal position to deactivate all the feeders and, preferably, to arrest the bobbin-winding mechanism. With at least one thread guard disposed between its feeder and the twisting station, a rupture of the twisted yarn will slacken the thread associated with that guard, thereby allowing the switch arm thereof to occupy its off-normal position. On the 30.06.1 970 the Hamel AG published US3517497A, relating to a textile machinery wherein threads are drawn from respective reels and are engaged by respective thread guards which monitor their tension to sense the occurrence of a thread break, such occurrence resulting in the arresting of a yarn interaction meanscore on which the threads are being wound, a delayed-action brake stops the rotation of each wheel a predetermined time after the yarn interaction meanscore has been arrested, thereby preventing entanglement and avoiding the risk of rupture of an unbroken thread. US3262180A, published on the 26.07.1 966 by Scragg and Sons, relates to textile machines and in particular to devices for detecting yarn breakages of a plurality of yarns in textile machines. The textile machine includes an elongated rod and a support means which supports the rod for free falling movement to a given position. The rod carries a yarn- engaging means which engages a plurality of yarns to maintain the rod above the position to which it is capable of freely falling as long as the yarn-engaging means engages the plurality of yarns. This yarn-engaging means of the present invention is swingably connected to the rod for free swingable movement with respect thereto when any one of the plurality of yarns breaks, and the swinging movement of the yarn-engaging means with respect to the rod is such that the rod is released for falling movement whenever any one of the plurality of yarns breaks.

US4505099A, published on the 1 9.03.1 985 by Murata Machinery Ltd, relates to a device for cutting fed yarns at a suitable position in quick response to the breakage of the yarn when a plurality of yarns are arranged and twisted together in a twisting frame. A first cutter which is operated by a detecting device and cuts the yarn on the yarn feeding side and a second cutter which is operated by the detecting device and cuts the yarn on the yarn taking out side of the twisting frame. The device comprises a rocking plate and a sensor, which acts to detect the leg extending from the rocking plate. The rocking plate is rotatably mounted to a shaft and which includes a pin which is in contact with the twisted yarn. The arm is urged to rotate in the counter-clockwise direction thus pressing the pin against the yarn. When one or both of the first yarn component and the second yarn component are broken for one cause or another during twisting operation, the tension on the twisted yarn is decreases abruptly. This rotates the rocking plate and the sensor having a photoelectric structure detects the occurrence of the yarn breakage and operates cutters. DE19642222A1 , published on 1 6.04. 1 998 by Zinser Textilmaschinen GmbH, relates to a ring spinner to produce a cladded yarn. It comprises a sensor in the path of a roving to the drawing unit to register faults. Through the sensors an actuator switches a stop unit on detecting a fault and/or stop the feeds of the yarn components. The stop unit is related to US4727713A.

US4501 1 14A, published on 26.02.1 985 by SKF Kugellagerfabriken GmbH, relates to an electro mechanical device for monitoring a passage of a roving through a textile spinning or twisting machine which is regulated through operation of a control element associated with the movement of the roving. Light reflected from the moving material is converted into a variable electrical signal which is then modulated and used to operate a light-emitter. The modulated output of the light-emitter is sensed by a receiver located remote therefrom, but in direct-line-of sight, into an electrical command signal for operating the control element.

Generally, the currently known technical solution have the disadvantage that they are comparably space consuming, have a rather complex mechanical system and are susceptible to wear out shortly.

It is an object of the invention to provide a simple, robust and space saving device for monitoring the spinning of a complex core yarn comprising one or several filaments.

SUMMARY OF THE INVENTION An embodiment of the invention comprises a monitoring device for monitoring of the manufacturing of core yarn in a ring spinning device. A core yarn according to the invention normally has a core comprising at last one filament which is enclosed by fibers of a roving processed by a draw frame. Depending on the field of application, the monitoring device is suitable to monitor the manufacturing of complex core yarns comprising more than one core. The monitoring device is, with respect to the moving direction of the roving, arranged upstream from the intake of a thereto related draw frame.

A monitoring device according to the invention normally comprises a housing with an actuator arranged displaceable linearly and/or rotatably in a first direction between a locked first position and an unlocked second position. The actuator is foreseen to interrupt itself (directly) or via other means (indirectly) the inflow of the fibers of at least one roving into a spinning process arranged downstream of a the thereto related draw frame depending on the absence of at least one filament and/or another faulty condition.

The monitoring device further comprises a trigger mechanism comprising a trigger element displaceable linearly and/or rotatably in a second direction having a latched first position locking the actuator in the locked first position and an unlatched second position releasing the actuator to the unlocked second position. The trigger element is foreseen to interact with at least one monitoring element directly or indirectly indicating the absence of a filament as described herein.

The invention offers the advantage that the trigger element is foreseen to interact with at least two monitoring elements simultaneously having the ability to indicate the absence (or a fault) of a thereto related filament. The trigger element in this situation is acting as a differential element which can be actuated by any of the thereto interconnected monitoring elements independently. Preferably the trigger mechanism is arranged at least partially in the housing.

If in two monitoring elements are present, the monitoring device is preferably built such that the activation of the trigger mechanism and the thereto interconnected actuator by one filament interrupts the supply of the second filament. In a preferred variation the trigger element is arranged rotatable around a trigger element rotation axis. Good monitoring results can be achieved if the actuator is arranged linearly displaceable in the first direction pretensioned against the force of a spring. Alternatively or in addition the trigger element can be arranged linear displaceable with respect to the actuator.

In a preferred variation the trigger element comprises a first locking element and the actuator comprises a second locking element which interacts with the first locking element in the locked position of the actuator. Good results can be achieved if the first locking element is arranged with respect to the interaction of the elements displaceable in a perpendicular direction (at an angle of 90°) with respect to the second locking element. By variation of the angle the sensitivity can be adjusted when the trigger element releases the actuator. The first locking element can e.g. be a recess arranged at the trigger element and the second locking element can be a protrusion arranged at the actuator. The protrusion can be integrally formed at the actuator. Good results are achieved if the protrusion is in the form of a durable element, e.g. made from a metallic material such as steel, which is snapped into a corresponding recess at the actuator. To guarantee precise operation, the actuator can be pretensioned against the force of a spring. Depending on the design alternative or addition drive options for the actuator are available, e.g. by gravity and/or by interconnecting the actuator to a movable part of the spinning device, such as one of the rollers arranged at the intake of the related draw frame.

In a preferred variation at least one monitoring element comprises a rocker arm arranged tilting around a rocker arm tilting axis and comprising at a free end a deflection roller for deflecting a filament to be monitored. Under normal conditions during production the rocker arm, respectively the deflection roller is in contact with the filament to be monitored in an equilibrium. In case of a fault, e.g. when the tension in the filament is reduced or the filament breaks, the equilibrium is disturbed and the rocker arm interacts with the trigger element which itself then interacts with the actuator. In a preferred variation the at least one rocker arm comprises a lever which in case of a fault interacts with the trigger element thereby releasing the actuator from the locked first position into the unlocked second position. The trigger element may comprise a first shoulder foreseen to interact with the lever of the rocker arm. One advantage of the invention is that the trigger element may comprises a second shoulder or even a third shoulder arranged adjacent to each other.

Alternatively or in addition to the above described variations according to the invention the monitoring device may comprise at least one of the following additional features: A first additional feature may be that the actuator and/or the trigger element can be interconnected to an indicator, e.g. in the form of a warning sticker which becomes visible in the case of an error. A simple but yet easy and robust indicator can be achieved by a pin which mechanically interconnected to the actuator and or the trigger element, e.g. by a ramp. The warning sticker may under normal conditions hidden in a recess in the housing of the monitoring device and when actuated pushed outside of the housings such that is protrudes by a certain distance. For a more pronounced effect the visible part of the indicator may be coated in a signal color such as e.g. yellow. The indicator may be part of the trigger having a visible part that is protruding out of the housing, if said trigger is in the unlatched second position. Another additional feature may be a bolt element which gives the user the opportunity to bolt the actuator in the first latched position hence preventing the actuator to be trigged and displaced.

A further additional feature is for the case that one rocking arm is used but a second rocker arm is present on the monitoring device. Therefore, the respective rocker arm that is not used needs to be temporarily fixed in its position, so that the gravitational force does not move the rocker arm in the position where it triggers the trigger element. This may be realized by a block which can be mounted on the respective rocker arm. The block supports the weight of the rocker arm against the housing of the monitoring device, preferably close to where the rocker arm tilting axis is located.

A further additional feature may be used to accommodate for different mounting angles of the monitoring device to the draw frame resulting in different filament tensions. Depending on the orientation of the monitoring device in respect to the ring spinning device the tension of filaments and the center of gravity of the at least one rocker arm may differ significantly. Therefore, a spring element in combination with a spacer may be used to ensure the right contact pressure of at least one rocker arm against the trigger element and a sufficient mechanical moment to move the trigger in the second unlatched position. The spring element presses the lever of the rocker arm against the trigger element. The spacer may be used to further adjust the position of the at least one rocker arm and therefore the tension of the respective filament as well as the location of the center of gravity of the respective rocker arm. The position of the center of gravity is important since it influences the magnitude of the resulting mechanical moment of the rocker arm around the rocker arm tilting axis. This mechanical moments needs to be sufficient large enough to displace the trigger and hence unlatch the activator.

The invention further relates to a method for the production of a complex core yarn comprising a first filament and second filament enclosed by the fibers of a roving in a spinning process. Herein the tension of the first and the second filament is monitored by a first and a second monitoring element before the filaments are enclosed by the fibers of the roving in a spinning point arranged downstream of a draw frame. Both monitoring elements are interconnected to an actuator via a trigger mechanism which in the case that the tension in at least one of the filaments drops below a predefined value activate the actuator through the interconnection of the trigger mechanism, such that via the actuator the supply of the fibers of the roving by the draw frame is interrupted.

The fibers may further be interrupted by at least one separator which is interconnected to the actuator in that the at least one separator acts upon the at least one roving in the area of the intake of the draw frame and thereby interrupts the supply of the fibers to the spinning point such that the spinning process is stopped.

Preferably, the at least one separator is designed in a way that it if the actuator is displaced the separator tilts around its base and is thrust between a pair of delivering rollers. It has proved to be advantageous to design the separator in a sickle shape that is snapped on the respective driving roller of the delivering roller pair. If the actuator is in the locked first position, the driving roller is in contact with the filaments and /or the roving, delivering the same. In the unlocked second position, the separator is tilted and part of the sickle of the separator is moved between the driving roller and the respective filament and/or roving preventing the contact. Other designs of the separator are possible.

If one filament is monitored and that filaments breaks, only the remaining roving needs to be stopped. Therefore, the contact of said roving to the driving roller of an entry roller pair of the ring spinning device, where the roving is introduced, needs to be disrupted.

However, if two filaments are monitored simultaneously and only one filament breaks, preferably two separators are used so that next to the roving also the remaining second filament is stopped. The filaments and the roving are introduced and further facilitated at different places in the ring spinning device: The roving is introduced and delivered at the entry roller whereby the filaments are introduced at a delivery roller. Hence, two different separators acting on different rollers are advantageous for a sufficient stop of all yarn components.

BRIEF DESCRIPTION OF THE DRAWINGS

The herein described invention will be more fully understood from the detailed description given herein below and the accompanying drawings which should not be considered limiting to the invention described in the appended claims. The drawings are showing:

Fig. 1 a first variation of a monitoring device in a perspective manner;

Fig. 2 the monitoring device according to Figure 1 at the intake of a draw frame;

Fig. 3 a second variation of a monitoring device according to the invention in partially sectioned view showing the inside of the monitoring device;

Fig. 4 an enlarged view of the inside of the monitoring device according to Figure 3;

Fig. 5 a-c different operable operating conditions of the monitoring device according to Figure 3;

Fig. 6 the monitoring device according to the invention in partially sectioned view showing an indicator and a bolt element;

Fig. 7 detail of the bolt element in an open position according to Figure 3;

Fig. 8 detail of the bolt element in a bolted position according to Figure 3 ; Fig. 9 monitoring device according to Figure 3 showing a detail of a spacer;

Fig. 1 0 monitoring device according to Figure 3 showing a detail of a block;

Fig. 1 1 monitoring device according to Figure 3 showing another detail of a spring element.

DETAILED DESCRIPTION OF THE INVENTION

The foregoing summary, as well as the following detailed description of the preferred variations of the invention, are better understood when read in conjunction with the appended drawings. For the purposes of illustrating the invention, an embodiment that is presently preferred, in which like numerals represent similar parts throughout the several views of the drawings, it being understood, however, that the invention is not limited to the specific methods and instrumentalities disclosed.

Figure 1 shows a first variation of a monitoring device Ί according to the invention in a perspective view. Figure 2 shows another variation of the monitoring device 1 at an intake of a draw frame 1 8 of a ring spinning device 2. Figure 3 shows a further variation the monitoring device 1 in a partially sectioned view, such that the inside becomes apparent. Figure 4 shows a close-up view of the inside of the monitoring device at an enlarged scale. Figures 5a through 5c are showing different operable conditions of the monitoring device 1 .

The monitoring device 1 is foreseen to monitor the manufacturing of a complex core yarn in the ring spinning device 2. The core yarn may comprise two filaments 1 5 on the inside. The monitoring device 1 is normally arranged upstream to a draw frame 1 8 and normally comprises a housing 3 with an actuator 4 arranged displaceable in a first direction x in the housing 3 between a locked first position and an unlocked second position. The actuator 4 is foreseen to act directly or via at least one other element, such as e.g. a separator 33 , on the fiber of a roving to be controlled. In the first variation of the invention shown in Figure 1 two individual separators 33 are used for simultaneously interrupting the supply of the filaments 1 5 and the roving 31 . Both separators are activated by the displacement of the actuator 4 which trigger is explained herein after. If the actuator 4 is displaced each sickle shaped separators 33 tilts around its base and is disabling the contact of the driving roller (not shown here) to the filament 1 5 and/or roving 31 . If only one filament 1 5 breaks, two separators 33 are advantageous so that next to the roving 3 1 also the remaining second filament 1 5 is stopped. This is due to the fact that the filaments are introduced and further facilitated at different places in the ring spinning device: The roving is introduced and delivered at an entry roller pair 34 and the filaments and a delivery roller pair 35. Hence, preferably two different separators 33 are used for a sufficient stop of all yarn components (see Figure 2).

As visible in Figures 3 and 4 the monitoring device 1 comprises in the housing 3 a trigger mechanism 5 comprising a trigger element 6 displaceable in a second direction (in the present example z) having a latched first position (see Figure 5a) locking the actuator 4 in the locked first position and an unlatched second position (see Figures 5b or 5c) releasing the actuator 4 to the unlocked second position. The trigger element 6 interacts in the shown variation with two monitoring elements 1 0 each indicating the absence of a filament 1 5 as described herein. The trigger element 6 is foreseen to interact with at least two monitoring elements 1 0 each indicating the absence of a thereto related filament 1 5. As visible, the trigger mechanism 5 of the shown variation is arranged in the housing 3. The housing 3 comprises fastening means in the form of an opening 21 and a clamp 22. The opening 21 is foreseen to receive a holding bar (not shown in detail) of the spinning device 2 to which normally the draw frame 1 8 is attached. Alternatively or in addition other holding means are possible. As visible, the holding means 21 , 22 are arranged in vertical direction above the actuator 4. The trigger element 6 comprises a first locking element 8 and the actuator 4 comprises a second locking element 9 which interacts with the first locking element 8 in the locked position of the actuator 4. Good results can be achieved if the trigger element 6 is arranged rotatable around a trigger element rotation axis 7 which is arranged relatively close to the linear displaceable actuator 4, preferably on the level of the first and the second locking elements 8, 9. In the shown variation, the first locking element 8 is a recess arranged on the trigger element 6 and the second locking element 9 is a protrusion arranged on the actuator 4. Thereby it can be achieved that the trigger mechanism 5 can operate very robust, but still reliable and sensitive. In the shown variation, the second locking element is a bolt 9 arranged in a mount 20 arranged at the actuator 4. The bolt 9 is preferably made from a durable material such as steel providing in combination with the material of the first locking element 8 arranged at the trigger element 6 a sensitive behavior of the trigger mechanism 5. Depending on the field of application, the trigger element 6 may be arranged linear displaceable with respect to the actuator 4. As shown, the first locking element 8 is arranged displaceable in a perpendicular direction with respect to the second locking element 9. The actuator 4 is in the locked first position pretensioned against the force of a spring 1 9.

The at least one monitoring element 1 0 comprises a rocker arm 1 1 arranged tilting around a rocker arm tilting axis 1 2 and comprising at a free end a deflection roller 1 3 for deflecting the filaments 1 5 to be monitored. The rocker arms 1 1 each comprise a lever 1 4 arranged in the housing 3 which during production of yarn interacts with the trigger element 6 in the case of absence of a thereto related filament 1 5 thereby releasing the actuator 4 from the locked first position into the unlocked second position. The actuator 4 thereby acting itself and /or via other means upon the flow of the fibers of a roving such that the intake of the fibers is interrupted. The trigger element 6 comprises a first shoulder 1 6 foreseen to interact with the lever 1 4 of a first rocker arm 1 1 . In addition the trigger element 6 comprises a second shoulder 1 7 arranged adjacent to the first shoulder 1 6 to interact with a lever 1 4 of a rocker arm 1 1 of a second monitoring element 1 0. The first and the second shoulder 1 6, 1 7 are arranged within a certain first radial distance R 1 with respect to the trigger element rotation axis 7 and the first locking element 8 at a second radial distance R2 with respect to trigger element rotation axis 7. The first and the second radial distances R 1 and R2 are schematically indicted by a projection in axial direction (y-direction). The first radial distance R 1 is preferably larger than the second radial distance R2. Good results can be achieved if the first radial distance R 1 is about 1 20° to 250° of the second radial distance R2. Depending on the field of application, the first radial distances R 1 of the first and the second shoulder 1 6, 1 7 may vary up to 50% with respect to each other. This can be compensated by the radial length of the rocker arms 1 1 .

A space saving and reliable design can be achieved if at least one rocker arm tilting axis 1 2 as well as the trigger element 6 are in a vertical direction arranged above the actuator 4.

Figures 5a through 5c are showing the monitoring device 1 in different conditions. In Figure 5a the trigger element 6 is in the latched first position locking the actuator 4 in the locked first position. In Figure 5b the trigger element 6 is shown in the unlatched second position releasing the actuator 4 to the unlocked second position by the force of the spring 1 9. The trigger element 6 interacts in the shown condition with the first monitoring element 1 0 arranged on the right-hand side in the drawing. In Figure 5c the trigger element 6 is also shown in the unlatched second position releasing the actuator 4 to the unlocked second position by the force of the spring 1 9. However, the trigger element 6 in this case interacts with the second monitoring element 1 0 arranged on the left-hand side in the drawing. Both monitoring elements 1 0 are foreseen to rotate around their tilting axis 1 2 in the case of absence of a thereto related filament 1 5. Thereby they interact with the trigger element 6 thereby unlatching the actuator 4 from the locked into the unlocked position as shown.

Figure 5c and Figure 6 illustrates the case, where at least one core filament 1 5 is missing and the actuator 4 is in its second unlocked position. In both Figures a ramp 29 can be seen that is attached to actuator 4. If the actuator 4 is moved from the first locked position to the second unlocked position the ramp 29 slides underneath an indicator 30 which is then lifted in a vertical direction. Due to this vertical displacement, the indicator protrudes out of the housing 3 so that a person maintaining the monitoring device 1 and/or the drafting arrangement 2 may optically perceive the malfunction/missing filaments. For a more pronounced effect the visible part of the indicator 30 may be coated in a color such as e.g. red.

The monitoring device 1 may additionally comprise a bolt element 23. If actuator 4 of the monitoring device 1 is in its first locked position a bolt element 23 may manually be moved from a first open position to a second bolted position. In the second bolted position the actuator 4 of the monitoring device 1 is locked in its first locked position and cannot move in its second unlocked position. Hence, if a filament breaks, the actuator 4 is not displaced and the transport of the filaments 1 5 is not interrupted. Figure7 illustrates the bolt element 23 in the first open position. Additionally, Figure 8 illustrates the bolt element 23 in its bolted position. In the open position the actuator 4 is partly guided within first cut-outs 27 of the bolt element 23 and the actuator 4 can be moved from the first locked to second unlocked position. The actuator 4 features further two corresponding second cut-outs 28 that are orientated in such a way that if the actuator is in the first locked position the second cut-outs 28 are orientated around the bolt element 23 and enables the vertical displacement of the same to the bolted position. In the bolted position the actuator 4 stays in the first locked position and cannot be actuated and the first cut-outs of the bolt element 23 are displaced together with said bolt element 23 in vertical direction and are orientated essentially above the actuator 4. Thus the actuator 4 cannot be moved (from its first locked position to its second unlocked position) through the first cut-outs 27 of the bolt element 23.

Depending on the orientation of the monitoring device 1 in respect to the ring spinning device 2 the tension of filaments 1 5 and the center of gravity of the at least one rocker arm may differ significantly. To ensure the right contact pressure of at least one rocker arm 1 1 against the trigger element 6 and a sufficient mechanical moment to move the trigger in the second unlatched position, a spring element 24 in combination with a spacer 26 may be used in a further variation of the invention, as illustrated by Figure 9 and 1 1. The spring element 25 presses the lever 1 4 of the rocker arm 1 1 against the trigger element 6. This may be achieved by the spring element having two spring legs and a coiled spring center. The coiled center is preferably wound around the lever 1 4 of the respective rocker arm 1 1 . The first spring leg su pports the spring against the housing 3 and the second spring leg is hooked around the lever of the rocker arm (compare Figure 1 1 ) . At the same time at least one spacer 26 may adjust the position and hence the center of gravity of at least one rocker arm 1 1 in the position where the respective filament is present. Figure 10 displays a further variation of the monitoring device 1 according to the invention, where only one of the two rocking arm 1 1 is used to manufactured core yarn that only consists of a single core filament. For the monitoring device 1 to still function properly, the respective rocker arm 1 1 that is not used needs to be fixed in its position, so that the gravitational force does not move the rocker arm 1 1 in the position where it triggers the trigger element 6. This is realized by a block 24 which can be mounted on the respective rocker arm 1 1 . The block 24 supports the weight of the rocker arm 1 1 against the housing 3 of the monitoring device 1 , close to where the rocker arm tilting axis 1 2 is located. In that way, the respective rocker arm 1 1 which is not used is always in a position where the trigger element 6 cannot be triggered.

LIST OF DESIGNATIONS

A1 Arrow 1 6 First shoulder (trigger element)

A2 Arrow 1 7 Second shoulder (trigger element)

A3 Arrow 1 8 Draw frame

1 Monitoring device 1 9 Spring

2 Ring spinning device 20 Mount (second locking element)

3 Housing 21 Opening (fastening means)

4 Actuator 22 Clamp (fastening means)

5 Trigger mechanism 23 Bolt element

6 Trigger element 24 Block

7 Trigger element rotation axis 25 Spring element

8 First locking element (trigger 26 Spacer

element) 27 First cut-outs

9 Second locking element (actuator) 28 Second cut-outs

/ Bolt 29 Ramp

1 0 Monitoring element 30 Indicator

1 1 Rocker arm 31 Roving

1 2 Rocker arm tilting axis 32 Spinning point

1 3 Deflection roller ( rocker arm) 33 Separator

1 4 Lever (rocker arm) 34 Entry Rollers

1 5 Filament 35 Delivery Rollers

Claims

PATENT CLAIMS

1. A monitoring device ( 1 ) for monitoring of the manufacturing of core yarn in a ring spinning device ( 2) comprising: a. a housing (3 ) with b. an actuator (4) arranged displaceable in a first direction (x) in the housing (3 ) between a locked first position and an unlocked second position; c. a trigger mechanism (5) comprising a trigger element (6) displaceable in a second direction (z) having a latched first position locking the actuator (4) in the locked first position and an unlatched second position releasing the actuator (4) to the unlocked second position; wherein d. the trigger element (6) is foreseen to interact with at least one monitoring element ( 1 0) indicating the absence of a filament.

2. The monitoring device ( 1 ) according to claim 1 , wherein the trigger element (6) is foreseen to interact with at least two monitoring elements ( 1 0) each indicating the absence of a thereto related filament ( 1 5).

3. The monitoring device ( 1 ) according to one of the previous claims, wherein trigger mechanism ( 5 ) is arranged in the housing (3 ).

4. The monitoring device ( 1 ) according to one of the previous claims, wherein the trigger element (6) is arranged rotatable around a trigger element rotation axis (7).

5. The monitoring device ( 1 ) according to one of the previous claims, wherein the trigger element (6) is arranged linear displaceable.

6. The monitoring device ( 1 ) according to one of the previous claims, wherein the trigger element (6) comprises a first locking element (8) and the actuator (4) comprises a second locking element (9) which interacts with the first locking element

(8) in the locked position of the actuator (4) .

7. The monitoring device ( 1 ) according to claim 6, wherein the first locking element (8) is arranged displaceable in a perpendicular direction with respect to the second locking element (9 ). 8. The monitoring device ( 1 ) according to claim 6 or 7, wherein the first locking element is a recess (8) arranged at the trigger element (6) and the second locking element (9) is a protrusion arranged at the actuator (4) .

9. The monitoring device ( 1 ) according to one of the previous claims, wherein the actuator (4) is in the locked first position pretensioned against the force of a spring ( 1 8) .

10. The monitoring device ( 1 ) according to one of the previous claims, wherein at least one monitoring element ( 1 0) comprises a rocker arm ( 1 1 ) arranged tilting around a rocker arm tilting axis ( 1 2 ) and comprising at a free end a deflection roller ( 1 3 ) for deflecting a filament ( 1 5 ) to be monitored. 1 1. The monitoring device ( 1 ) according to claim 1 0, wherein the at least one rocker arm ( 1 1 ) comprises a lever ( 1 4) which during production of yarn interacts with the trigger element (6) in the case of absence of a thereto related filament ( 1 5 ) thereby releasing the actuator (4) from the locked first position into the unlocked second position.

12. The monitoring device ( 1 ) according to claim 1 1 , wherein the trigger element (6) comprises a first shoulder ( 1 6) foreseen to interact with the lever ( 1 4) of the at least one rocker arm ( 1 1 ).

13. The monitoring device ( 1 ) according to claim 1 2, wherein the trigger element (6) comprises a second shoulder ( 1 7 ) arranged adjacent to the first shoulder ( 1 6).

14. A ring spinning device ( 2 ) comprising at least one monitoring device ( 1 ) according to one of the claims.

15. Method for the production of a complex core yarn comprising a first filament ( 1 5) and a second filament ( 1 5) enclosed by the fibers of a roving in a spinning process, wherein a. the tension of the first and the second filament ( 1 5) is monitored by a first and a second monitoring element ( 1 0) before the filaments ( 1 5) are enclosed by the fibers of the roving (31 ) in a spinning point (32) arranged downstream of a draw frame, wherein b. both monitoring elements ( 1 0) are interconnected to an actuator (4) via a trigger mechanism (5 ) which in the case that the tension in at least one of the filaments ( 1 5) drops below a predefined value activate the actuator (4) through the interconnection of the trigger mechanism ( 5 ), such that c. via the actuator the supply of the fibers of the roving (31 ) by the draw frame ( 1 8) is interrupted.

Method according to claim 1 5, wherein the fibers are interrupted by a separator (32) which is interconnected to the actuator (4) in that the separator (32 ) acts upon the roving (31 ) in the area of the intake of the draw frame ( 1 8) and thereby interrupts the supply of the fibers to the spinning point (32) such that the spinning process is stopped.