CN112093584B

CN112093584B - Yarn connecting device for knotless connection of two yarn ends

Info

Publication number: CN112093584B
Application number: CN202010547635.9A
Authority: CN
Inventors: 亚历山大·马克思; T·R·亚当斯; K·洛伦茨; S·本特尔
Original assignee: Saurer Spinning Solutions & CoKg GmbH
Current assignee: Saurer Spinning Solutions & CoKg GmbH
Priority date: 2019-06-18
Filing date: 2020-06-16
Publication date: 2022-08-30
Anticipated expiration: 2040-06-16
Also published as: DE102019116487A1; JP2020203794A; CN112093584A

Abstract

The invention relates to a thread connecting device for the knotless connection of two thread ends, wherein friction disks are mounted in a housing so as to be rotatable relative to one another in order to exert a mechanical action on the thread ends to be connected. The invention provides that the housing is designed in at least two parts, wherein one friction disc each is arranged in a part of the housing, the first part of the housing comprises a fixing means, the second part of the housing comprises a corresponding receptacle for the fixing means, the fixing means comprises a guide means, and the second part of the housing is movable on the guide means and can be fixed on the first part of the housing.

Description

Yarn connecting device for knotless connection of two yarn ends

Technical Field

The invention relates to a yarn connecting device and a textile machine for manufacturing winding bobbins, comprising the yarn connecting device.

Background

In the textile industry, yarn joining devices have long been known in the prior art and are described in a large number of patent applications. The yarn joining device produces almost the same yarn joining as the yarn by swirling or rotating the two yarn ends. Such a yarn connection is an important criterion for the quality of the yarn and should not only have a strength similar to that of the yarn, but also have an appearance as similar as possible to that of the yarn.

When a thread break occurs in the textile machine producing the wound bobbin during the process or when a defined cleaning cut is carried out at one of the stations of the textile machine due to a thread defect, the thread end of the broken thread is first withdrawn by means of a special air flow device in the region of the thread connecting or joining device. The suction nozzle then withdraws the so-called upper thread from the cross-wound bobbin and introduces it into the thread connecting device, possibly after removing thread defects. Correspondingly, a so-called doff, for example from a feed bobbin located in the unwinding position, is also inserted into the yarn connecting device by means of a nipper tube which can be subjected to underpressure.

The principle of mechanical splicing is that the upper and lower yarns are first untwisted and then spun/twisted again by the friction disk rotating in opposite directions, wherein the yarn ends are shortened after the untwisting so that they overlap and engage with each other only in a limited area.

EP0120523a1 discloses a yarn connecting device comprising two friction discs which can be driven toward each other for applying a mechanical action to two ends of a yarn. The yarn ends are first positioned between the friction discs at the beginning of the yarn joining process, untwisted and torn. In order to locally limit and bundle the yarn ends which are now in the form of brushes and no longer have a twist and in which the fibers are approximately parallel to one another, the yarn ends are bundled by means of a so-called reed and then spliced to one another, i.e. jointly twisted.

The yarn connecting device according to EP0140412a1 comprises two friction discs, each friction disc comprising an untwisting-twist assembly and a twist assembly. In addition, the yarn connecting device has an adjustable cam mechanism which activates untwisting and twisting separately from each other, and a spacer which at least temporarily holds the friction disk surfaces at a desired distance. In order to tear or rip the yarns, means are provided for gripping and tearing the respective yarns, including movable portions.

The friction disk of the yarn connecting device according to EP0140412a1 is mounted in a receptacle of the yarn connecting device so as to be rotatable and preferably also pivotable. The friction disks D are each supported by a plurality of helical springs on a respective rotor, which in turn is each arranged in a support housing of the thread connecting device. Since the friction disks are almost inaccessible, the thread connecting device must first be removed from the textile machine for replacing the friction disks, and then detached. That is, in the known yarn connecting device according to EP0140412a1, the replacement and cleaning of the friction discs is relatively costly and complicated, always requiring the use of specially trained technicians. In addition, the yarn connecting device is not available at this station during the disassembly process. The daily required cleaning of the friction discs is also cumbersome because of the narrow spatial position.

Disclosure of Invention

A first aspect of the invention therefore relates to a thread connecting device for the knotless connection of two thread ends, wherein a plurality of friction discs are mounted rotatably relative to one another in a housing for the purpose of exerting a mechanical action on the thread ends to be connected.

The yarn connecting device is characterized in that the housing is designed in at least two parts, wherein one friction disk each can be arranged in one part of the housing, the first part of the housing comprises a fixing means, the second part of the housing comprises a corresponding receptacle for the fixing means, the fixing means comprises a guide means, the second part of the housing can be moved on the guide means and can be fixed on the first part of the housing.

In this way, the yarn joining device has the possibility of breaking the housing so that the friction disc can be comfortably accessed. In this maintenance position, the friction disk can be replaced and cleaned without removing the thread connecting device from the working position. The maintenance interval is not only simplified, but also significantly shortened.

It is also conceivable within the scope of the invention for the thread connecting device to support the cleaning process by moving through a defined cleaning and/or maintenance stroke when the maintenance tool is inserted between the friction disks in the maintenance position.

In one advantageous embodiment, the fastening means is formed by two long bolts.

By means of this design, the technician only has to loosen the two long bolts in order to be able to adjust the maintenance position of the thread connecting device. That is, the technician may complete the cleaning of the friction discs or even the replacement of the friction discs quickly and without any special tools. The time required for the completion of the respective work task is limited to a minimum.

In an alternative design, the fastening means is formed by a bayonet connection.

A bayonet connection is a mechanical connection that can be quickly established and separated.

Preferably, the friction discs are magnetically mounted.

In this way, the inventive concept is particularly advantageously improved. By magnetically supporting the friction disc, the friction disc is easily accessible in a service position and can be installed and removed without tools, so that cleaning or replacement of the friction disc, which is known to be subject to wear, can be carried out at any time without prior removal of the yarn connecting device from the textile machine. This has the advantage, inter alia, that neither expert knowledge nor special tools are required for mounting or dismounting the wear part. The worn friction disks can be removed smoothly in a minimum of time, for example, by a regular textile machine operator and replaced with new friction disks at any time.

A second aspect of the invention therefore relates to a textile machine for producing bobbins, having a yarn connecting device for the knotless connection of two yarn ends.

The textile machine for producing wound bobbins is characterized in that at least one thread connecting device is formed according to one of the embodiments described above.

To this end, the advantages and effects described in connection therewith can be achieved. A textile machine having at least one yarn connecting device of this design allows rapid cleaning or replacement of the friction disks. In addition, the technician is relieved of burden, since the thread connecting device no longer has to be removed from the respective work station, but only the fixing means, such as for example two long bolts, have to be loosened in order to be adjusted into a maintenance position, in which the friction disk can be replaced smoothly and quickly. The efficiency of the textile machine is improved as a whole.

Further features and advantages of the invention will appear from the following description of a preferred embodiment of the invention, taken in conjunction with the drawings and the accompanying drawings which show important details of the invention. These features can be implemented in a preferred embodiment of the present invention alone or in any combination of a plurality thereof.

Drawings

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 shows a side view of a workstation of a winding machine with a yarn connecting device;

FIG. 2a shows a schematic view of a yarn connecting device of the present invention in a station; and

fig. 2b shows a schematic view of the yarn connecting device of the invention in a maintenance position.

List of reference numerals

Textile machine for producing wound bobbins

2 station

3 cheese tube conveying system

4 cop supply section

5 memory segment

6 transverse conveying section

7 bobbin feedback section

8 conveying disc

9 spinning bobbin

10 yarn connecting device

11 casing

12 suction nozzle

13 first pivot axis

14 bobbin driving roller

15 Cross-wound bobbin

16 friction disk

17 first housing part

18 second housing part

20 second pivot axis

21 cross-wound bobbin conveying device

22 third pivot axis

24 winding device

25-clamp bobbin

28 bobbin creel

29 station computer

30 yarn guide mechanism

31 upper yarn

32 run yarn

33 yarn breaking mechanism

34 fixing mechanism

35 guiding mechanism

Detailed Description

Fig. 1 shows a schematic representation of a textile machine, in the exemplary embodiment a winding machine, which produces wound bobbins, designated as a whole by reference numeral 1, in a front view.

Such a winding machine 1 usually has a plurality of identical stations 2 between its (not shown) end frames, at which spinning bobbins 9, for example produced on a ring spinning machine, are rewound into large cross-wound bobbins 15 as is known and therefore not described in detail.

After the production, the cross-wound bobbins 15 are transferred by means of an automatically operating service unit, preferably a (not shown) cross-wound bobbin changer, to a cross-wound bobbin conveyor 21 along the machine length and to a bobbin loading station or the like provided at the machine end.

Such a winding machine 1 usually also has a logistics device in the form of a bobbin transport system 3, in which the spinning bobbins 9 or empty bobbins circulate in a vertical orientation on a conveyor plate 8. Fig. 1 shows only the cop supply section 4, the storage section 5, which can be driven in the forward and reverse direction, the cross feed section 6 leading to the working position 2 and the bobbin return section 7 of the bobbin transport system 3.

Furthermore, such a winding machine 1 is generally provided (not shown) with a central control unit which is connected via a machine bus not only to the station computers 29 of the several stations 2 but also to the control of the service aggregate.

AS already indicated, the supplied spinning bobbin 9 is rewound in the unwinding position AS (in the region of the transverse transport section 6 at the station 2) to form a large cross-wound bobbin 15.

These work stations 2 are known for this purpose and are therefore provided with different mechanisms, only shown, which ensure the orderly working of the work stations. Such as a suction nozzle for operating the upper thread 31, which is rotatable about the first pivot axis 13 in a limited manner, a gripper tube 25 for operating the lower thread 32, which is rotatable about the second pivot axis 20, and a thread connecting device 10, into which the upper thread 31 and the lower thread 32 are inserted for performing the thread connecting process.

Such a station 2 is generally also provided with other mechanisms which are not shown in detail, such as a yarn tensioner, a yarn clearer, a waxing device, a yarn severing device, a yarn tension sensor and a yarn take-down sensor.

The winding of the cross-wound bobbin 15 takes place on a winding device 24. Such a winding device 24 is provided in particular with a creel 28 which is mounted so as to be movable about the third pivot axis 22 and has a mechanism for rotatably holding a cross-wound bobbin. During the winding process, the cross-wound bobbin 15, which is mounted in a freely rotatable manner in the bobbin creel 28, rests with its surface on the bobbin drive roller 14 and is frictionally carried along by it.

Fig. 2a shows a part of a schematic representation of the yarn connecting device 10 according to the invention in a station.

The yarn connecting device 10 with the housing 11 is provided with two friction discs 16. For connecting the two thread ends, i.e. for connecting the upper thread 31 and the lower thread 32, the upper thread 31 is positioned between the friction disks 16 by means of the suction nozzle 12 and the lower thread 32 by means of the clamping tube 25. For this purpose, the thread is guided by the thread guide 30 to ensure the orderly insertion of the thread ends into the thread connecting device 10, and the thread is guided by the thread severing device 33 to cut the thread later.

Two fastening means 34, which in this exemplary embodiment are formed by long screws, are visible and accessible.

In the maintenance position shown in fig. 2b, the open position of the housing 11 of the yarn connecting device 10 can be seen. The housing 11 is provided with a first housing part 17 and a second housing part 18. A friction disc 16 is arranged in each

housing part

17, 18. After releasing the fixing means 34 mounted on the first housing part 17 of the housing 11, the second housing part 18 of the housing 11 is moved by the guide means 35, so that the distance between the friction disks 16 is enlarged in relation to the work station. In the service position, the friction disc 16 is readily accessible to a technician and may be cleaned or replaced.

After the friction disc 16 has been replaced or cleaned, the second housing part 18 is moved back towards the first housing part 17, by the second housing part 18 being moved by the guide means 35 of the fixing means 34. The second housing part 18 is fixed to the first housing part 17 by screwing the fixing means 34.

Claims

1. A yarn connecting device (10) for the knotless connection of two yarn ends, wherein a plurality of friction discs (16) are mounted in a housing (11) rotatably relative to each other for applying a mechanical action to the yarn ends to be connected, characterized in that the housing (11) is designed at least in two parts, wherein in each case one friction disk (16) is arranged in a part of the housing (11), the first housing part (17) of the housing (11) comprises a fixing means (34), the second housing part (18) of the housing (11) comprising a corresponding receptacle for the fixing means (34), the fixing means (34) comprising guide means (35), and the second housing part (18) of the housing (11) is movable on the guide mechanism (35) and can be fixed on the first housing part (17) of the housing.

2. Yarn connecting device (10) according to claim 1, characterised in that the fixing means (34) are formed by two long bolts.

3. Yarn connecting device (10) according to claim 1, characterised in that the fixing means (34) are formed by a bayonet connection.

4. Yarn connecting device (10) according to claim 1, characterised in that the friction disc (16) is magnetically mounted.

5. Textile machine (1) for producing wound bobbins, having a yarn connecting device (10) for the knotless connection of two yarn ends, characterized in that at least one yarn connecting device (10) is formed according to one of claims 1 to 4.