EP2957663B1 - Method for operating an open-end spinning machine - Google Patents

Description

The invention relates to a method for operating an open-end spinning device for an open-end rotor spinning machine with a spinning rotor whose rotor shaft is supported in a rotor shaft bearing device and acted upon by a rotating machine-tangential tangential belt and its rotor cup during high-speed spinning operation in a rotor housing unterdruckbeaufschlagbaren circulates. The rotor housing can be closed by a cover element, in which a thread withdrawal nozzle and a thread withdrawal tube are arranged. In addition to the outlet opening of the thread withdrawal tube, a reversibly drivable thread withdrawal device is also installed.

In the textile machinery industry, various embodiments are prior art in the context of open-end rotor spinning machines.
The open-end rotor spinning machines can differ in terms of the design of their jobs, especially their open-end spinning devices, as well as with respect to the operation or the operation of these open-end spinning devices after a spinning break.

The DE 37 23 504 A1 shows an open-end spinning device with an exchangeable spin damper element, to which a thread withdrawal tube is attached. The DE 195 44617 A1 discloses an open-end spinning apparatus wherein the fiber feed channel comprises a tube of glass or ceramic and an adapter made of plastic.

In particular, when Wiederanspinnen the jobs after a power outage, in which it has come to a spinning break at all jobs of the spinning machine at the same time, the operations of the known open-end rotor spinning machines are sometimes quite different.

By the DE 101 39 075 A1 For example, open-end rotor spinning machines are known, which are equipped with so-called self-sufficient jobs.

That is, the jobs of these open-end rotor spinning machines are designed so that they can spontaneously spangle after a spin interruption without further help from the outside.

A disadvantage of open-end rotor spinning machines, which are equipped with such self-sufficient jobs, however, is the relatively high energy consumption, in particular the Saugluftbedarf need such jobs during a piecing process. This has the consequence that after a power failure only a limited number, for example, ten, these self-sufficient jobs again simultaneously spindles can, with the result that it always takes a long time due to the large number of jobs such open-end rotor spinning machines until all workstations have spun the spinning machine again.
Accordingly, these known open-end rotor spinning always have only a reduced efficiency during the numerous Wiederanspinnvorgänge.

Furthermore, for example, by the DE 199 17 968 A1 Open-rotor spinning machines known whose jobs are supplied by one or more control units. At this open-end rotor spinning are mobile so-called Anspinnwagen installed, if necessary, the jobs that need help, approach and, for example, re-spinner their open-end spinning devices after spinning interruptions again.
It is easy to understand that in such open-end rotor spinning after a power outage, which has come at all jobs of the open-end rotor spinning machine to a spinning break, even more Anspinnwagen need a longer time to the many jobs of the open-end rotor spinning machine again to spin.
That means that through the DE 199 17 968 A1 known open-end rotor spinning machines have after a power failure due to the lengthy Wiederanspinnvorganges even more reduced efficiency.

By the DE 10 2005 036 485 A1 In addition, so-called semi-automatic open-end rotor spinning machines are known. The workplaces of these semi-automatic open-end rotor spinning machines have, as usual, a spinning device for producing a thread, a thread take-off device and a winding device for producing a cross-wound package rotatably supported in a creel, wherein the spinning device comprises a spinning rotor revolving in a rotor housing at high speed, a sliver Disconnecting roller and a single motor driven Faserbandzuführzylinder and the thread withdrawal device can be acted upon by a single drive.
Furthermore, each workstation of this semi-automatic open-end rotor spinning machine has a device for the defined cutting to length of a thread manually retrieved by the operating staff from the cross-wound bobbin, a storage device for receiving a certain amount of thread and a selectively controllable drive means for lifting the cheese from the bobbin drive roller.
In these semi-automatic open-end rotor spinning machines, the drive of the thread withdrawal device can each be reversibly driven. In addition, each workstation has a manually activatable control device by which the piecing process can be started, wherein during the piecing process, the drive of the thread take-off device, the drive of the sliver picking cycle and the drive device for lifting the cross-wound bobbin are controlled according to a predetermined piecing program.

That is, the jobs of such semi-automatic open-end rotor spinning machines are designed so that they can be spun easily after a spin interruption without the need for a special, costly service unit is necessary. The quality of the created piecing meets today's high quality standards.

Overall, such semiautomatic open-end rotor spinning machines are relatively inexpensive textile machines. However, even with these known semi-automatic open-end rotor spinning machines disadvantageous that after a power failure in which it comes at all jobs of the textile machine at the same time to a spinning break, the numerous jobs again time consuming individually need to be re-spun, the operator must take part of the work each piecing process.

In particular, in areas where power failures have to be reckoned with more frequently, open-end rotor spinning machines which operate in the so-called "joint-spinning-in" method have also long been in use.
In this method, which is also known as mass piecing, an open-end rotor spinning machine, after a power failure, simultaneously spins the open-end spinning devices of all its work stations at the same time.
An open-end rotor spinning machine, which works according to this long-known piecing process, is for example in the DE 36 35 510 A1 described in relative detail.

In this known open-end rotor spinning machine takes a defined decommissioning of all their jobs, for example, if the supply voltage fails and does not return within two seconds.

That is, in open-end rotor spinning machines, which operate in accordance with the "Joint-Spinning-In" method, for example, at the workstations after two seconds each provided for a controlled braking of the package, at the same time the respective distance of the yarn end of the fiber collection channel of the associated Spinning rotor determined and stored for later recommissioning of the job in a computer.
That is, at all jobs such open-end rotor spinning machines the yarn end remains at a spinning interruption always in the range of the respective thread withdrawal tube of the open-end spinning device of the job, which for this reason has a relatively large length.

For example, by the DE 36 35 510 A1 known open-end rotor spinning at the same time an automatic restart of the jobs at reinstallation of the supply voltage at all jobs. In other words, the thread take-off devices of the workstations ensure that the player ends are fed back according to the stored value stored in the computer and, at the same time, the fiber feed is restarted at the workstations.
After a predetermined period of time, the newly spun threads are withdrawn through the now again in the withdrawal direction current thread withdrawal devices.

In practice, this means that open-end rotor spinning machines, which work in the "Joint-Spinning-In" method, are operational again much faster after a power failure than open-end rotor spinning machines whose workstations after a power failure only gradually re-spun Need to become. However, the piecers produced in the "Joint-Spinning-In" process generally do not meet high quality standards and would be cut out immediately by a yarn cleaner as yarn defects.
In order to avoid this, in open-end rotor spinning machines, which work in the "Joint-Spinning-In" -Procedure, usually dispenses with the use of yarn cleaners, with As a result, the yarn produced often does not meet high quality requirements.

Starting from open-end rotor spinning machines of the type described above, the invention has the object to develop methods for operating an open-end spinning device, which makes it possible to operate an open-end rotor spinning machine either either in the "Joint-Spinning-ln" method or Open-end spinning devices of the open-end rotor spinning machine workplaces are to be individually wound, for example semi-automatically, that is to provide an open-end spinning device that can be modified to recover quickly either after a power failure or through the arrangement of one between the two Thread take-off tube and the thread take-off device turned on yarn cleaner is designed so that the quality of the thread and the piecing are monitored and thus the production of high-quality yarn is guaranteed.

Starting from an open-end spinning device of the type described above, this object is achieved according to the invention by a method for operating an open-end spinning device according to claim 1.

The length of the thread withdrawal tube used in each case depends on the piecing process which is used in the piecing back of the open-end spinning devices of the relevant open-end rotor spinning machine.

Such a design has the advantage that when the open-end rotor spinning machine is to be operated in the "Joint-Spinning-In" method, thread withdrawal tubes can be used which are so long that, in the event of a voltage drop initiated, controlled shutdown of the jobs a whereabouts of the Gamenden within the thread withdrawal tube is guaranteed even with large, that is, delay can be set up packages.

Alternatively, if the piecing operation at the work stations is to be performed individually and, for example, partially manually, the thread withdrawal tubes are made shorter, so that retrieval of the yarn end accumulated on the package and its subsequent insertion into the thread withdrawal tube is possible without difficulty even in the presence of a yarn cleaner is.

The differently long thread withdrawal tubes are also optimally fixable in the cover element of the open-end rotor spinning device advantageously by the holder advantageously different in height. That is, depending on the length of the thread withdrawal tube, each one in its installation height optimally adapted holder is used.

In an advantageous embodiment, it is provided that in an intended use of the so-called "Joint-Spinning-In" thread withdrawal tubes are used, the length of each is greater than the length of thread withdrawal tubes, which find use when the open-end spinning devices of Open-end rotor spinning machine in Einzelanspinnen method and thus preferably operated with Garnreinigem.

As already indicated above, in the "Joint-Spinning-In" method can be ensured by the use of relatively long thread withdrawal tube that even with large packages, which are known to have a significantly higher kinetic energy than small packages, the yarn always, which is absolutely necessary is, remains within the thread withdrawal tube.
On the other hand, when piecing workstations, the use of short draw-off tubes can easily create the space needed to install a yarn cleaner in the area between the draw-off tube and the draw-off device while leaving sufficient space to insert the recovered yarn end into the draw-off tube can.

In an advantageous embodiment, when using long thread withdrawal tubes preferably holders with a relatively large installation height are used, while at short thread withdrawal tube preferably find use holder, which have a relatively low installation height.
In this way, an optimal utilization of given at work above the open-end rotor spinning devices, known to be somewhat cramped space conditions is always guaranteed.

In an advantageous embodiment, the thread withdrawal tubes are each made of glass, while the holders are each made of plastic. Thread extractor tubes made of glass have long been proven components in textile machinery, which are also easy and inexpensive to manufacture in almost any length.
The production of the holder made of a plastic also has the advantage that such a holder is relatively easy and inexpensive to manufacture with good strength. In addition, a plastic holder forms a largely resistant to unfavorable environmental influences construction.

In an advantageous embodiment, it is further provided that the thread withdrawal tubes are clipped into the holder in the operating state of the open-end spinning devices.

Such a method of attachment has the advantage that the two components can be easily taken apart or put together at shut down jobs anytime. The thread withdrawal tube securely fastened in its associated holder by a clip connection also ensures proper operation of the open-end rotor spinning device of the work site at any time during the spinning process.

Further details of the invention are shown in an embodiment shown below with reference to the drawings.

Fig. 1

in perspektivischer Rückansicht eine Offenend-Spinnvorrichtung für eine Offenend-Rotorspinnmaschine, bei der die Arbeitsstellen mit einem Garnreiniger ausgestattet sind und bei der die Offenend-Spinnvorrichtungen einzeln, das heißt, nacheinander angesponnen werden,

Fig. 2

in perspektivischer Rückansicht eine Offenend-Spinnvorrichtung für eine Offenend-Rotorspinnmaschine, die im "Joint-Spinning-In"-Verfahren arbeitet,

Fig. 3a

in Seitenansicht, teilweise im Schnitt, eine Offenend-Spinnvorrichtung mit einem Halter und einem Fadenabzugsröhrchen, wie sie beim Einzelanspinnen zum Einsatz kommen,

Fig. 3b

in Seitenansicht, teilweise im Schnitt, eine Offenend-Spinnvorrichtung mit einem Halter und einem Fadenabzugsröhrchen, wie sie im "Joint-Spinning-In"-Verfahren zum Einsatz kommen.

It shows:

Fig. 1

in perspective rear view of an open-end spinning device for an open-end rotor spinning machine, in which the jobs with a yarn cleaner and in which the open-end spinning devices are individually wound, that is, one after the other,

Fig. 2

in a perspective rear view of an open-end spinning device for an open-end rotor spinning machine, which operates in the "Joint Spinning-In" method,

Fig. 3a

in side view, partly in section, an open-end spinning device with a holder and a thread withdrawal tube, as used in Einzelanspinnen used

Fig. 3b

in side view, partially in section, an open-end spinning device with a holder and a thread withdrawal tube, as used in the "Joint-Spinning-In" method used.

In the FIG. 1 Open-end spinning device 1 shown has a bearing device 2, with which it is limited pivotally mounted on a stationary, usually machine-length bearing axis 3.
The in the Figures 1 and 2 For reasons of clarity, spinning rotor 7, not shown in more detail, is rotatably mounted with its rotor shaft 4 in a direct bearing device 5 and is driven by a circumferential, machine-length (not shown) tangential belt on which the rotor shaft 4 bears from below. The rotor housing 6, in which the spinning cup 11 of the spinning rotor 7 rotates at high speed during the spinning process, is closed by a cover element 8. The direct bearing device 5 and the rotor housing 6 form a rotor shaft bearing device 9, which is connected via a pivot axis 10 to a sliver opening device 12 of the open-end spinning device 1.
In (not shown) open open-end spinning device 1, the rotor shaft bearing device 9 is positioned in an inoperative position in which a brake member 13 abuts the rotor shaft 4, which is positioned at this time spaced from the machine-length, further circulating tangential belt.

In the sliver opening device 12, as usual, rotatably mounted an opening roller, which during the spinning operation, for example, by a machine-length Tangential belt is driven. Furthermore, a so-called sliver feed cylinder is rotatably mounted in the sliver opening device 12, the drive of which is effected in the exemplary embodiment via a single drive, for example a stepping motor. The axes of rotation of the opening roller and the sliver feed cylinder are arranged orthogonal to the axis of rotation 17 of the spinning rotor 7 during the spinning process.

At the sliver opening device 12 of the open-end spinning device 1, an upper cover 16 and a lower cover 15 are attached, which prevent too rapid contamination of the open-end spinning device 1. The upper cover 16 in this case has a connection socket 14, in which a holder 18, in the embodiment of FIGS. 1 and 3a , A holder 18 _{A is set} interchangeable in each case.
As follows from the Fig. 3a will be explained in more detail, is in the holder 18 _A , which has a relatively low installation height h, for example, via a clip closure, a relatively short thread withdrawal tube 19 _A set, which has a length I.

The FIG. 2 shows in perspective rear view of an open-end spinning device 1 for a workstation of an open-end rotor spinning machine, which operates in the so-called "Joint-Spinning-In" method and is equipped for this reason, for intermediate storage of the yarn with a thread as long as possible Fadenabzugsröhrchen.

The open-end spinning device 1 according to Fig. 2 corresponds to the holder 18 and the thread withdrawal tube 19 of the basis of the Fig.1 Open-end spinning device 1 described.

How out Fig.2 can be seen in this embodiment on the terminal base 14 of the upper cover 16 interchangeably a holder 18 _B set, the installation height H is well above the installation height h of the holder 18 _A.
As follows from the Fig. 3b will be explained in more detail, is in the holder 18 _B , which has a relatively large installation height H, for example, via a clip closure, a relatively long thread withdrawal tube 19 _B set, which has a length L.

The 3a shows in side view, partly in section like the Fig.1 , an open-end spinning device 1 for a workstation of an open-end rotor spinning machine, which is individually, preferably partially manually, spun.
Such open-end spinning devices 1 are advantageously provided with a yarn clearer 21, and therefore require in the region between the mouth 22 of the yarn withdrawal tube 19A and a downstream yarn withdrawal device 20, some space, which through the use of a suitably adapted holder 18 _A and an associated thread take-off tube 19 _A is realized ,
For this reason, a holder 18 _{A is} interchangeably fixed to the connection base 14 of the upper cover 16, which has a relatively small installation height h. In the holder 18 _A , for example via a clip closure, a thread withdrawal tube 19 _A set, which also has a correspondingly short length I accordingly.

The 3b also shows in side view and partly in section how the Fig.2 , an open-end spinning device 1 for a job of an open-end rotor spinning machine, which operates in the so-called "Joint-Spinning-In" method and is therefore equipped, for temporary storage of the Gamendes, with the longest possible Fadenabzugsröhrchen.

As can be seen, a holder 18 _{B is} interchangeably fixed to the connection base 14 of the upper cover 16, which has a relatively large installation height H.
In the holder 18 _B , a thread withdrawal tube 19 _{B is} determined via a suitable fastening means, which has a relatively large length L.
In practice, draw-off tubes 19 _B with the long length L provide sufficient space for the twine to be temporarily stored in the event of a voltage drop and required for re-spinning in the "Joint-Spinning-In" method.

Claims (4)

1. Method for operating an open-end spinning device (1) for an open-end rotor spinning machine comprising a spinning rotor (7), the rotor shaft (4) of which is supported in a rotor shaft bearing device (9) and can be pressurised by a rotating, machine-length tangential belt, and the rotor cup (11) of which rotates during the spinning operation at high speed in a rotor housing (6) which can be charged with negative pressure, which can be closed by a cover element (8), on which a thread take-off nozzle (23) and a thread take-off tube (19A, 19B) are arranged, wherein a reversibly drivable thread take-off device (20) is installed spaced apart from the opening (22) of the thread take-off tube (19),
   characterised in that,
   a cover (16) of the open-end spinning device (1) arranged at the top is provided respectively with a replaceable holder (18A, 18B) projecting over the latter for one end of a thread take-off tube (19A, 19B), which is connected at its other end to the cover element (8) in the region of the thread take-off nozzle (23), wherein two holders (18A, 18B), which have different dimensions with respect to their height projecting over the cover (16) arranged at the top, and the thread take-off tubes (19A, 19B), which vary in length (I, L) according to the difference in height, can be secured alternatively in the cover (16), and wherein a thread take-off tube (19A, 19B) is used, the length (I, L) of which is dependent respectively on the piecing method which is used when re-piecing the open-end spinning devices of the relevant open-end rotor spinning machine.
2. Method according to claim 1, characterised in that with the intended use of the so-called "joint spinning-in" method, thread take-off tubes (19B) are used, the length (L) of which is greater than the length (I) of thread take-off tubes (19A), which are used when the open-end spinning devices (1) of the open-end rotor spinning machine are operated in the individual piecing method.
3. Method according to claim 2, characterised in that when using thread take-off tubes (19B) for the so-called "joint spinning-in" method holders (18B) are used, which have a relatively large installation height (H), whereas with thread take-off tubes (19A), which are used when the open-end rotor spinning devices (1) of the open-end rotor spinning machine are operated in an individual piecing method, holders (18A) are used which have a low installation height (h).
4. Method according to claim 1, characterised in that the thread take-off tubes (19A, 19B) of the open-end- spinning devices (1) are clipped respectively into a holder (18A, 18B).

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