CN110114522B

CN110114522B - Method and apparatus for making composite core-spun yarn

Info

Publication number: CN110114522B
Application number: CN201780064464.0A
Authority: CN
Inventors: C.芬坎; K.古伦德
Original assignee: Amsler Co ltd
Current assignee: Amsler Co ltd
Priority date: 2016-10-19
Filing date: 2017-10-13
Publication date: 2022-10-11
Anticipated expiration: 2037-10-13
Also published as: EP3529402A1; CN110114522A; WO2018073119A1

Abstract

The invention relates to a monitoring device (1) for monitoring the manufacture of a core yarn in a ring spinning device (2) and a method for producing a composite 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. The trigger mechanism (5) comprises a trigger element (6) displaceable in the second direction (z), the trigger element (6) having a latched first position locking the actuator (4) in the latched first position and an unlatched second position releasing the actuator (4) to the unlatched second position. The triggering element (6) is foreseen for interacting with at least one monitoring element (10) indicating the absence of the filament.

Description

Method and apparatus for making composite core-spun yarn

Technical Field

The present invention relates to a method and an apparatus for manufacturing a composite core spun yarn, in particular monitoring the manufacturing of a core spun yarn having at least one filament.

Background

WO10006955A1 published by the same applicant at 21/1/2010 relates to a mechanical monitoring device for the manufacture of core spun yarn. The monitoring device comprises a front deflection roller for deflecting the wire. The deflection roller is arranged above the delivery roller of the stretcher. The cutting device is arranged at the inlet of the drawing machine and has a rear deflection roller for deflecting the filaments. The cutting device is used to prevent the roving from flowing into the stretcher depending on the tension level of the filaments. For example, when the filaments break, the flow of the roving into the stretcher is stopped. The cutting apparatus may include a self-locking device that prevents roving from flowing into the stretcher depending on the presence of and/or tension in the filaments. The cutting device may have a rear deflection roller operatively connected to a blade for interrupting the inflow of the roving to the stretcher. The rear deflecting roller and the blade may be operatively connected via a rocker arranged to be rotatable about an axis. The self-locking device may comprise a roller or a pair of rollers with a latching claw operatively mechanically connected to the wire guide of the wire. Furthermore, the self-locking device may comprise a mechanism that is pretensioned against the force of a spring.

WO16092126A1 published by Pinter Caipo 6/16 2016 discloses a monitoring device for the manufacture of core spun yarn. The device foresees for interrupting the supply of roving when the filaments break during the process of spinning the core-spun yarn. The apparatus comprises a self-locking device arranged to be inserted between a pair of rollers for supplying the roving, so as to interrupt the supply of the roving by acting on said rollers. The device comprises a mechanism that is pretensioned against the force of a spring.

US3388544a published by Hamel AG 6, 18, 1968 relates to an apparatus for simultaneously monitoring tension in two or more filaments delivered to a twisting station by separate feeders. Each feeder has an associated individual filament guard in the form of a biased switch arm that engages the respective filament. Upon rupture of any wire, the corresponding switch arm displaces the common control member into an abnormal position to release all feeders and preferably capture the bobbin winding mechanism. In the case of at least one thread protection plate arranged between its feeder and the twisting station, the breakage of the twisted yarn will cause the thread associated with the thread protection plate to slacken, allowing its switching arm to take up its abnormal position. On 30/6.1970, hamel AG published US3517497a, which relates to a textile machine in which a thread is drawn from a respective reel and engaged by a respective thread guard that monitors thread tension to sense the occurrence of thread breakage, which results in the capture of a yarn interaction device core (meanscore) on which the thread is wound, a slow brake stopping rotation of each wheel a predetermined time after the yarn interaction device core has been captured, thereby preventing tangling and avoiding the risk of breakage of unbroken threads.

US3262180a published by scrigg and Sons in 1966, 7-26, relates to textile machines and in particular to an apparatus for detecting yarn breaks in a plurality of yarns in textile machines. The textile machine comprises an elongate bar and a support device which supports the bar for free-fall movement to a set position. The rod carries a yarn engaging device that engages a plurality of yarns to maintain the rod above a position to which it can freely fall, so long as the yarn engaging device engages the plurality of yarns. The yarn joining device of the present invention is swingably connected to the lever so as to be freely swingably moved relative thereto when any one of the plurality of yarns is broken, and the swinging movement of the yarn joining device relative to the lever causes the lever to be released to perform a falling movement each time any one of the plurality of yarns is broken.

US4505099a published by Murata Machinery ltd 3/19 in 1985 relates to an apparatus for cutting a fed yarn at a suitable position in rapid response to breakage of the yarn when arranging a plurality of yarns in a twisting machine and twisting them together. A first cutter is operated by the detection device and cuts the yarn on the yarn feeding side and a second cutter is operated by the detection device and cuts the yarn on the yarn take-up side of the twisting machine. The apparatus includes a rocker paddle and a sensor for detecting a leg extending from the rocker paddle. The rocker plate is rotatably mounted to the shaft and it includes a pin that contacts the twisted yarn. The arm is pushed to rotate in a counterclockwise direction, thus pressing the pin on the yarn. When one or both of the first and second yarn assemblies break during the twisting operation for one or other reason, the tension on the twisted yarn is abruptly reduced. This rotates the rocker paddle and a sensor with an opto-electronic structure detects the occurrence of yarn breakage and causes the cutter to operate.

DE19642222A1 published by Zinser Textilmaschen GmbH at 16.4.1998 relates to a ring spinning machine for producing a cladded yarn. Which includes sensors in the path of the roving to the drawing unit to register faults. By means of the sensor, the actuator switches on the stop unit to detect a malfunction and/or to stop the feeding of the yarn assembly. The stop unit is associated with US 4727713A.

US4501114a, published by SKF kugellager fabriken GmbH, 2/26 th 1985, relates to an electromechanical device for monitoring the passage of a roving through a spinning or twisting machine, which is regulated by the operation of control elements 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 cause the light emitter to operate. The modulated output of the light emitter is sensed by a receiver located remotely but in line of sight as an electrical command signal for operating the control element.

Generally, the technical solutions currently known have the drawback of being rather space-consuming, of having a relatively complex mechanical system and of being susceptible to short-term wear.

The object of the present invention is to provide a simple, robust and space-saving device for monitoring the spinning of a composite core yarn comprising one or several filaments.

Disclosure of Invention

Embodiments of the present invention include a monitoring apparatus for monitoring the manufacture of core yarn in a ring spinning apparatus. The core-spun yarn according to the invention generally has a core comprising at least one filament encapsulated by the fibers of the roving treated by the stretcher. Depending on the field of application, the monitoring device is adapted to monitor the manufacturing of a composite core-spun yarn comprising more than one core-spun. The monitoring device is arranged upstream of the inlet of the drawing machine associated therewith with respect to the direction of movement of the roving.

The monitoring device according to the present invention generally comprises a housing with an actuator arranged to be linearly and/or rotatably displaceable in a first direction between a locked first position and an unlocked second position. The actuator is foreseen for (foreee) interrupting the flow of the fibers of at least one roving to the spinning process arranged downstream of the drawing machine with which it is associated (directly) or (indirectly) via other means, depending on the absence of at least one filament and/or on another failure condition itself.

The monitoring device further comprises a trigger mechanism comprising a linearly and/or rotatably displaceable trigger element 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 for interacting with at least one monitoring element directly or indirectly indicating the absence of a filament as described herein.

The present invention provides the advantage that the triggering element is foreseen for interacting with at least two monitoring elements having at the same time the ability to indicate the absence (or failure) of the wire associated therewith. In this case, the trigger element acts as a differential element that can be independently actuated by any monitoring element interconnected therewith. Preferably, the trigger mechanism is at least partially arranged in the housing.

If there are two monitoring elements, the monitoring device is preferably constructed such that activation of the trigger mechanism and the actuator interconnected thereto by one wire interrupts the supply of the second wire.

In a preferred variant, the trigger element is arranged to be rotatable about a trigger element rotation axis. Good monitoring results can be achieved if the actuator is arranged to be linearly displaceable in a first direction pre-tensioned against the force of the spring. Alternatively or additionally, the trigger element may be arranged to be linearly displaceable relative to the actuator.

In a preferred variant, the triggering element comprises a first locking element and the actuator comprises a second locking element interacting 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 an interaction of elements which are displaceable in a vertical direction (at an angle of 90 °) relative to the second locking element. By a change of the angle, the sensitivity can be adjusted when the trigger element releases the actuator. The first locking element may for example be a recess arranged at the triggering element and the second element may be a protrusion arranged at the actuator. The protrusion may be integrally formed at the actuator. Good results are achieved if the protrusion is in the form of a durable element (e.g. made of a metallic material such as steel) that snaps into a corresponding recess at the actuator. To ensure precise operation, the actuator may be pretensioned against the force of the spring. Depending on the design, alternatively or additionally, the drive options of the actuator may be obtained, for example, by gravity and/or by interconnecting the actuator to a movable part of the spinning apparatus (such as one of the rollers arranged at the inlet of the relevant stretcher).

In a preferred variant, the at least one monitoring element comprises a rocker arm arranged to tilt about a rocker arm tilting axis and comprising at a free end a deflection roller for deflecting the wire to be monitored. Under normal conditions during production, the rocker arm (respectively deflection roller) is in contact with the wire to be monitored in a balanced manner. In a fault situation, for example when the tension in the wire decreases or the wire breaks, this equilibrium is disturbed and the rocker arm interacts with the trigger element, which itself then interacts with the actuator. In a preferred variant, the at least one rocker arm comprises a lever which, in the event of a fault, interacts with the trigger element so as to release the actuator from the locked first position into the unlocked second position. The triggering element may comprise a first shoulder foreseen for interacting with the lever of the rocker. One advantage of the present invention is that the triggering element may comprise a second shoulder or even a third shoulder arranged adjacent to each other.

Alternatively or in addition to the above-described variant 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 triggering element may be interconnected to an indicator, for example in the form of a warning label that becomes visible in case of an error. A simple yet easy to use and robust indicator may be realized by a pin which is mechanically interconnected to the actuator and/or the trigger element, e.g. by a ramp (ramp). Under normal conditions, the warning label may be concealed in a recess in the housing of the monitoring device and, upon actuation, pushed outside the housing so as to protrude a certain distance. To a more pronounced effect, the visible portion of the indicator may be coated in a single color (e.g., yellow). The indicator may be part of the trigger having a visible portion that protrudes outside the housing with the trigger in the second, unlatched position.

Another additional feature may be a bolt element that gives the user the opportunity to bolt the actuator in the first latched position thus preventing the actuator from triggering and shifting.

A further additional feature refers to the use of one rocker arm, but the presence of a second rocker arm on the monitoring device. The respective rocker arm which is not used therefore needs to be temporarily fixed in its position, so that gravity does not move the rocker arm into the position in which it triggers the triggering element. This may be achieved by stops which may be mounted on the respective rocker arms. The blocking piece supports the weight of the rocker arm against the housing of the monitoring device, preferably close to the location where the rocker arm tilt axis is located.

Further additional features may be used to accommodate different mounting angles of the monitoring device to the drawing machine, resulting in different filament tensions. Depending on the orientation of the monitoring device relative to the ring spinning device, the tension of the filament and the center of gravity of the at least one swing arm may differ significantly. Thus, the spring element in combination with the spacer may be used to ensure a correct contact pressure of the at least one rocker arm against the trigger element and a sufficient mechanical moment to move the trigger into the second, non-latched position. The spring element presses the lever of the rocker arm against the triggering element. The spacer may be used to further adjust the position of the at least one rocker arm and thus the tension of the respective wire and the position of the center of gravity of the respective rocker arm. The position of the center of gravity is important because it affects the magnitude of the resulting mechanical moment of the rocker arm about the rocker arm tilt axis. This mechanical torque needs to be sufficiently large to displace the trigger and thus unlatch the actuator.

The invention further relates to a method for producing a composite core-spun yarn comprising a first filament and a second filament encapsulated by fibers of a roving in a spinning process. Here, the tension of the first and second filaments is monitored by means of first and second monitoring elements before the filaments are enveloped by the fibers of the roving in a spinning point arranged downstream of the drawing machine. The two monitoring elements are interconnected to the actuator via a triggering mechanism which activates the actuator by interconnection of the triggering mechanism in case the tension in at least one of the filaments falls below a predefined value, so that the supply of fibers of the roving by the stretcher is interrupted via the actuator.

The fibers can further be interrupted by at least one separator interconnected to the actuator, since the at least one separator acts on the at least one roving in the region of the inlet of the drawing machine and thus interrupts the supply of fibers to the spinning point so that the spinning process stops.

Preferably, the at least one separator is designed in such a way that, if the actuator is displaced, the separator tilts about its base and is pushed between a pair of transport rollers. It has proven advantageous to design the separator in the shape of a sickle, which snaps onto the respective drive roller of the transport roller pair. If the actuator is in the locked first position, the drive roller is in contact with the filament and/or roving of delivery filaments. In the unlocked second position, the separator is tilted and a portion of the sickle of the separator moves between the drive roller and the respective filament and/or roving, preventing contact. Other designs of the separator are also possible.

If one filament is detected and the filament breaks, the remaining roving need only be stopped. Therefore, it is necessary to interrupt the contact of the roving with the driving roller (the position where the roving is introduced) of the input roller pair of the ring spinning apparatus.

However, if two filaments are detected simultaneously and only one filament breaks, then preferably two separators are used so that the remaining second filament is also stopped alongside the roving. The introduction of filaments and rovings is introduced at different places in the ring spinning apparatus and further facilitated. The roving is introduced and transported at an input roller, whereby the filaments are introduced at a transport roller. Thus, two different separators acting on different rollers are advantageously used for a sufficient stop of all yarn assemblies.

Drawings

The invention described herein will be more fully understood from the detailed description given herein below and the accompanying drawings, which should not be taken to be limiting of the invention described in the appended claims. The attached drawings show:

fig. 1 is a first variant of a monitoring device in a perspective manner;

fig. 2 is the monitoring device according to fig. 1 at the inlet of the stretcher;

fig. 3 is a second variant of the monitoring device according to the invention in a partly sectional view, showing the interior of the monitoring device;

FIG. 4 is an enlarged view of the interior of the monitoring device according to FIG. 3;

FIG. 5 is a diagram of various operational operating conditions of a-c of the monitoring device of FIG. 3;

FIG. 6 is a monitoring device according to the present invention in partial cross-sectional view showing an indicator and a bolt element;

fig. 7 is a detail of the bolt element in the open position according to fig. 3;

fig. 8 is a detail of the bolt element in the bolted position according to fig. 3;

FIG. 9 is the monitoring device according to FIG. 3 showing details of the spacer;

FIG. 10 is the monitoring device according to FIG. 3 showing details of the blocking tab;

fig. 11 is the monitoring device according to fig. 3, showing another detail of the spring element.

Detailed Description

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

Fig. 1 shows a first variant of a monitoring device 1 according to the invention in perspective view. Fig. 2 shows another variant of the monitoring device 1 at the inlet of the stretcher 18 of the ring spinning device 2. Fig. 3 shows a further variant of the monitoring device 1 in partial sectional view, so that the interior becomes apparent. Fig. 4 shows a close-up view of the interior of the monitoring device on an enlarged scale. Fig. 5a to 5c show different operating conditions of the monitoring device 1.

The monitoring device 1 is foreseen for monitoring the manufacture of composite core yarns in a ring spinning device 2. The core spun yarn may comprise two filaments 15 inside. The monitoring device 1 is typically arranged upstream of the stretcher 18 and typically comprises a housing 3 with an actuator 4, the actuator 4 being arranged displaceable in the housing 3 in a first direction x between a locked first position and an unlocked second position. The actuator 4 is foreseen for acting on the fibres of the roving to be controlled, either directly or via at least one other element, such as for example a separator 33. In a first variant of the invention shown in fig. 1, two separate separators 33 are used to simultaneously interrupt the supply of filaments 15 and rovings 31. The two separators are activated by displacement of an actuator 4 (the trigger of which is explained later). If the actuator 4 is displaced, each sickle-shaped separator 33 tilts about its base and the drive roller (not shown here) cannot come into contact with the filaments 15 and/or rovings 31. If only one filament 15 breaks, the two separators 33 advantageously cause the remaining second filament 15 to also stop alongside the roving 31. This is due to the fact that: the introduction of the filaments is introduced at different places in the ring spinning apparatus and further facilitated. The roving is introduced and transported at a pair of input rollers 34 and a pair of filament and transport rollers 35. Therefore, preferably, two different separators 33 are used for the complete stop of all yarn assemblies (see fig. 2).

As can be seen in fig. 3 and 4, the monitoring device 1 comprises a trigger mechanism 5 in the housing 3, the trigger mechanism 5 comprising a trigger element 6 displaceable in a second direction (z in the present example) having a latched first position (see fig. 5 a) locking the actuator 4 in the locked first position and an unlatched second position (see fig. 5b or fig. 5 c) releasing the actuator 4 to the unlocked second position. The triggering element 6 interacts with two monitoring elements 10 in the shown variant, each monitoring element 10 indicating the absence of the wire 15, as described herein. The triggering element 6 is foreseen for interacting with at least two monitoring elements 10, each monitoring element 10 indicating the absence of the wire 15 associated thereto. As can be seen, the trigger mechanism 5 of the shown variant is arranged in the housing 3. The housing 3 comprises fastening means in the form of an opening 21 and a clip 22. The opening 21 foresees a holding rod (not shown in detail) for receiving the spinning device 2, to which the stretcher 18 is normally attached. Alternatively or additionally, other holding means are also possible. As can be seen, the holding means 21, 22 are arranged above the actuator 4 in the vertical direction.

The triggering element 6 comprises a first locking element 8 and the actuator 4 comprises a second locking element 9 interacting with the first locking element 8 in the locked position of the actuator 4. Good results can be achieved if the triggering element 6 is rotatably arranged around a triggering element rotation axis 7, which is arranged relatively close to the linearly displaceable actuator 4, preferably in the level of the first and

second locking elements

8, 9. In the variant shown, the first locking element 8 is a recess arranged on the triggering element 6 and the second locking element 9 is a projection arranged on the actuator 4. Hereby, it is achieved that the triggering mechanism 5 can be operated very robustly, but still reliably and sensitively. In the shown variant, the second locking element is a bolt 9 arranged in a seat frame 20, which seat frame 20 is arranged at the actuator 4. Preferably, the bolt 9 is made of a durable material, such as steel, so that in combination with the material of the first locking element 8 arranged at the triggering element 6a sensitive behavior of the triggering mechanism 5 is provided. Depending on the field of application, the triggering element 6 may be arranged to be linearly displaceable relative to the actuator 4. As shown, the first locking element 8 is arranged to be displaceable in a vertical direction with respect to the second locking element 9. The actuator 4 is in a locked first position pre-tensioned against the force of the spring 19.

The at least one monitoring element 10 comprises a rocker arm 11, which rocker arm 11 is arranged to tilt about a rocker arm tilting axis 12 and comprises at a free end a deflection roller 13 for deflecting the wire 15 to be monitored. The rocker arms 11 each comprise a lever 14 arranged in the housing 3, the lever 14 interacting with the triggering element 6 in the absence of the wire 15 associated therewith during the production of the yarn, so as to release the actuator 4 from the locked first position into the unlocked second position. The actuator 4 thus acts on the flow of the fibres of the roving by itself and/or via other means, so that the suction of the fibres is interrupted. The triggering element 6 comprises a first shoulder 16 foreseen for interacting with the lever 14 of the first rocker 11. In addition, the triggering element 6 comprises a second shoulder 17, which is arranged adjacent to the first shoulder 16 to interact with the lever 14 of the rocker 11 of the second monitoring element 10. The first and

second shoulders

16, 17 are arranged within a certain first radial distance R1 with respect to the trigger element rotation axis 7 and the first locking element 8 is arranged at a second radial distance R2 with respect to the trigger element rotation axis 7. The first and second radial distances R1 and R2 are schematically indicated by projections in the axial direction (y-direction). The first radial distance R1 is preferably greater than the second radial distance R2. Good results may be achieved if the first radial distance R1 is about 120 ° to 250 ° of the second radial distance R2. Depending on the field of application, the first radial distance R1 of the first and

second shoulder

16, 17 may vary up to 50% relative to each other. This can be compensated by the radial length of the rocker arm 11.

A space-saving and reliable design can be achieved if the at least one rocker arm tilting axis 12 and the triggering element 6 are arranged vertically above the actuator 4.

Fig. 5a to 5c show the monitoring device 1 under different conditions. In fig. 5a, the trigger element 6 is in the first position of the latch locking the actuator 4 in the locked first position. In fig. 5b, the trigger element 6 is shown in the non-latched second position, which releases the actuator 4 into the non-locked second position by the force of the spring 19. The triggering element 6 interacts with a first monitoring element 10 arranged on the right-hand side in the figure in the shown condition. In fig. 5c, the trigger element 6 is also shown in the non-latched second position, which releases the actuator to the non-locked second position by the force of the spring 19. In this case, however, the triggering element 6 interacts with a second monitoring element 10 arranged on the left-hand side in the figure. The two monitoring elements 10 are foreseen for rotation about their tilting axes 12 in the absence of the wire 15 associated therewith. It therefore interacts with the trigger element 6, thereby unlatching the actuator 4 from the locked position into the unlocked position, as shown.

Fig. 5c and 6 show a situation in which at least one core filament 15 is missing and the actuator 4 is in its second unlocked position. In both figures, the swash plate 29 can be seen attached to the actuator 4. If the actuator 4 is moved from the first locked position to the second unlocked position, the swash plate 29 slides under the indicator 30, and the indicator 30 is then lifted in the vertical direction. Due to this vertical displacement, the indicator protrudes outside the housing 3, so that a person servicing the monitoring device 1 and/or the towing arrangement 2 can optically perceive a faulty/missing wire. To a more pronounced effect, the visible portion of the indicator 30 may be coated with a color, such as, for example, red.

The monitoring device 1 may additionally comprise a bolt element 23. If the actuator 4 of the monitoring device 1 is in its first, locked position, the bolt element 23 can be moved manually from the first, open position to the second, bolted position. In the second bolting position, the actuator 4 of the monitoring device 1 is locked in its first locking position and cannot be moved into its second non-locking position. Thus, if the wire breaks, the actuator 4 does not displace and does not interrupt the delivery of the wire 15. Fig. 7 shows the bolt element 23 in the first open position. Fig. 8 also shows the screw element 23 in its screwed position. In the open position, the actuator 4 is partially guided within the first cutout 27 of the bolt element 23 and the actuator 4 can be moved from the first locking position to the second unlocking position. The actuator 4 is further characterized by two corresponding second cut-outs 28 which are oriented in such a way that, if the actuator is in the first locking position, the second cut-outs 28 are oriented around the bolt element 23 and enable a vertical displacement of the actuator into the bolting position. In the bolting position, the actuator 4 is in the first locking position and cannot be actuated, and the first cutout of the bolt element 23 is displaced together with said bolt element 23 in the vertical direction and is oriented substantially above the actuator 4. Thus, the actuator 4 cannot move (from its first locked position to its second unlocked position) through the first cutout 27 of the bolt element 23.

Depending on the orientation of the monitoring device 1 relative to the ring spinning device 2, the tension of the filament 15 and the center of gravity of the at least one swing arm may differ significantly. To ensure a correct contact pressure of the at least one rocker arm 11 against the trigger element 6 and a sufficient mechanical moment for moving the trigger into the second, non-latched position, a spring element 24 in combination with a spacer 26 may be used for further variants of the invention, as shown in fig. 9 and 11. The spring element 25 presses the lever 14 of the rocker 11 against the triggering element 6. This can be achieved by a spring element having two spring legs and a helical spring center. The centre of the helical spring is preferably wound on the lever 14 of the respective rocker arm 11. The first spring leg supports the spring against the housing 3 and the second spring leg hooks onto the lever of the rocker arm (compare fig. 11). At the same time, the at least one spacer 26 can adjust the position and therefore the center of gravity of the at least one rocker arm 11 in the position in which the respective wire is present.

Fig. 10 shows a further variant of the monitoring device 1 according to the invention, in which only one of the two rocker arms 11 is used for producing a core-spun yarn consisting of only a single core-spun yarn. In order for the monitoring device 1 to still function properly, it is necessary to fix the respective rocker arm 11, which is not in use, in its position so that gravity does not move the rocker arm 11 into the position in which it activates the activation element 6. This is achieved by a stop 24 which may be mounted on the respective rocker arm 11. The stop block 24 supports the weight of the rocker arm 11 against the housing 3 of the monitoring device 1, close to the location where the rocker arm tilt axis 12 is located. In this way, the respective rocker arm 11 which is not in use is always in a position in which it is not possible to activate the activation element 6.

Name list

A1 Arrow head

A2 Arrow head

A3 Arrow head

1. Monitoring device

2. Ring spinning apparatus

3. Outer casing

4. Actuator

5. Trigger mechanism

6. Trigger element

7. Axis of rotation of the triggering element

8. First locking element (trigger element)

9. Second locking element (actuator)/bolt

10. Monitoring element

11. Rocker arm

12. Rocker arm tilt axis

13. Deflection roller (Rocker arm)

14. Lever (Rocker arm)

15. Thread

16. First shoulder (trigger element)

17. Second shoulder (trigger element)

18. Stretching machine

19. Spring

20. Stand (second locking element)

21. Opening (fastening device)

22. Clip (fastening device)

23. Bolt element

24. Stop block

25. Spring element

26. Spacer member

27. First incision

28. Second incision

29. Inclined plate

30. Indicator device

31. Rough yarn

32. Spinning point

33. Separator

34. Input roller

35. And a conveying roller.

Claims

1. A monitoring device (1) for monitoring the manufacture of a composite core-spun yarn in a ring spinning device (2), the composite core-spun yarn comprising a first filament (15) and a second filament (15) being enveloped by fibers of a roving, the monitoring device comprising:

a. a housing (3) having

b. An actuator (4) arranged to be displaceable in a first direction (x) in the housing (3) between a locked first position and an unlocked second position, the actuator (4) being arranged to be able to interrupt the supply of fibres of the roving by means of at least one separator (33) interconnected to the actuator, in that the at least one separator (33) acts on the fibres in the region of an inlet of a drawing machine (18);

c. a trigger mechanism (5) arranged in the housing (3), the trigger mechanism comprising a trigger element (6) displaceable in a second direction (z), the trigger element (6) having a latched first position locking the actuator (4) in the latched first position and an unlatched second position releasing the actuator (4) to the unlatched second position;

d. at least two monitoring elements (10) each indicating the absence of one of the first or second filaments (15, 15) of the composite core-spun yarn, wherein both monitoring elements (10) are interconnected with the actuator (4) via the triggering mechanism,

e. wherein each of the monitoring elements (10) comprises a rocker arm (11), the rocker arm (11) being arranged to tilt about a rocker arm tilt axis (Y) and comprising a deflection roller (13) at a free end, the deflection roller (13) being for deflecting the first wire (15) or the second wire (15), respectively, to be monitored, and

f. wherein each rocker arm (11) comprises a lever (14) arranged in the housing (3), said lever (14) interacting with the trigger element (6) in the absence of a wire (15) associated therewith during yarn production, so as to release the actuator (4) from the locked first position to the unlocked second position.

2. The monitoring device (1) according to claim 1, wherein the trigger element (6) is arranged rotatable around a trigger element rotation axis (7).

3. The monitoring device (1) according to claim 1 or 2, wherein the trigger element (6) is arranged to be linearly displaceable.

4. The monitoring device (1) according to claim 1 or 2, wherein the triggering element (6) comprises a first locking element (8) and the actuator (4) comprises a second locking element (9) interacting with the first locking element (8) in the locked position of the actuator (4).

5. A monitoring device (1) according to claim 4, wherein the first locking element (8) is arranged to be displaceable in a vertical direction in relation to the second locking element (9).

6. The monitoring device (1) according to claim 4, wherein the first locking element is a recess arranged at the trigger element (6) and the second locking element (9) is a protrusion arranged at the actuator (4).

7. A monitoring device (1) according to claim 1 or 2, wherein the actuator (4) is in the locked first position pre-tensioned against the force of a spring (19).

8. Monitoring device (1) according to claim 1, wherein the triggering element (6) comprises a first shoulder (16) foreseen for interacting with the lever (14) of the at least one rocker arm (11).

9. The monitoring device (1) according to claim 8, wherein the trigger element (6) comprises a second shoulder (17) arranged adjacent to the first shoulder (16).

10. A ring spinning apparatus (2) comprising at least one monitoring apparatus (1) according to any one of claims 1 to 9.