WO2008049486A1 - Method and apparatus for operating a textile machine which produces crosswound bobbins - Google Patents

Abstract

The invention relates to a method and an apparatus for operating a textile machine which produces crosswound bobbins, in particular for the distribution as required of vacuum which is provided by a vacuum system of the textile machine to workstations of the textile machine which require vacuum, wherein a central control unit of the textile machine ensures that the vacuum in the vacuum system does not undershoot a defined minimum level. There is provision according to the invention for vacuum requirements (UD) of the workstations (1) which arrive in the central control unit (10) of the textile machine (5) to be distinguished according to at least one first priority class (I) and one second priority class (II), wherein vacuum requirements (UD) which are categorized in the first priority class (I) are always processed with preference.

Description

description

Method and device for operating a cheese-producing textile machine

The invention relates to a method and an apparatus for operating a cross-wound textile machine according to the preamble of claim 1 and of claim 8.

In connection with cheese-producing textile machines, which have a large number of jobs, it is known that the work stations constantly need suction air during their operation.

Tricot machines or open-end rotor spinning machines are, for example, such textile machines.

At the work stations of automatic packages, for example, the suction air is needed to continuously suck the constantly occurring during the rewinding fiber dust. In addition, the jobs of these textile machines always need suction when, for example, after a thread break or a controlled cleaner cut the accumulated on the cross-wound yarn end and must be transported to a yarn splicing device.

In order to cover the Saugluftbedarf their jobs, which, as indicated above, can be quite different, such textile machines usually have a machine-own Saugluftanlage with a vacuum source whose drive motor is connected to a frequency converter and defined in terms of its speed adjustable. That is, according to the Saugluftbedarfs the textile machine, the speed of the drive motor can be adjusted within certain limits. The drive motor runs, for example, initially at a speed at which the suppression in the suction air system does not fall below a certain minimum level at which proper extraction of the fiber dust is ensured. The speed of the drive motor is increased when, due to an event requiring additional intake air, an increased suction air requirement arises.

In DE 195 11 960 Al, for example, a textile machine is described in which the rotational speed of the drive motor of the

Suction unit of a suction system is adjusted so that always the basic requirement of the negative pressure of the textile machine is covered.

When a first event is reported, which subsequently leads to an increased intake air requirement, the speed of the

Drive motor of the suction unit increased to provide a predetermined increased negative pressure, with which the increased suction air demand can be met.

That is, the speed of the drive motor of the suction unit is adjusted so that when processing the first

Event as well as further intervening

Events the pressure level in the suction system always on one

Minimum value is maintained.

After completion of the last of these events, the speed of the drive motor of the suction unit is then back to the

Speed back to cover the basic vacuum demand.

Since the speed of the drive motor of the suction unit can not be increased endlessly, only a certain number of events, which lead to an increased intake air requirement, can be processed at the same time.

The events are therefore processed in the order of their receipt in a corresponding control device.

Also, to operate the jobs of an open-end rotor spinning machine is known to constantly suction required. The so-called spinning negative pressure present in the rotor housing of the open-end spinning devices of these textile machines ensures, for example during spinning operation, that the individual fibers combed from an opening roller from a master fiber strand are fed via a fiber guide channel into the spinning rotor, where they are turned into a thread. This means that even the workstations of open-end rotor spinning machines have a virtually constant vacuum demand during their regular spinning operation. The vacuum requirement of the individual workstations may, however, at times significantly increase, in particular when the workstations, as known for example from DE 101 39 075 Al, are designed as essentially self-sufficient workstations, for example when work has to be rewound and the thread is closed this purpose is retrieved by a workstation's own, unterdruckbeaufschlagbare suction nozzle of the cheese.

The open-end rotor spinning machines are therefore also equipped with a suction system, in which, if necessary, to increase the vacuum level, the speed of the drive motor of the suction unit can be increased up to a maximum speed. However, even in open-end rotor spinning always only a certain number of jobs, where there is an increased demand for suction, are supplied simultaneously. The jobs are therefore, as already explained in connection with automatic winder, also processed here in the order of their receipt.

A disadvantage of these known textile machines, however, is that when processing the Saugluftanforderungen the individual jobs only the order of receipt of these Saugluftanforderungen is taken into account.

That is, there is no distinction between "normal" and "urgent" Saugluftanforderungen, which should preferably be processed. Based on textile machines of the aforementioned type, the invention has the object to develop a method and an apparatus in which / from the work stations outgoing Saugluftanforderungen are processed so that the efficiency of the textile machines is improved.

This object is achieved by the method described in claim 1 or by the device set forth in claim 8.

Advantageous embodiments of the invention are the subject of the dependent claims.

The method according to the invention, in which negative pressure requirements of the workstations incoming into the central control unit of the textile machine are first differentiated according to at least two priority classes and then a vacuum request of the first priority class is always preferably processed, ensures that always preferably such workstations are supplied with negative pressure in which A time-delayed operation of the vacuum requirements would have a disproportionately negative effect on the efficiency of the textile machine.

As set forth in claim 2, a low pressure requirement of a workplace always has a high priority, when, for example, a mobile operating unit is positioned at the time of the vacuum request to the job concerned, which is to perform a cheese change at this work, for example.

That is, a proper supply of the workplace by the control unit is only possible if the workstation is sufficiently supplied with suction, since the control unit only an auxiliary thread that is needed for re-spinning a job after a bobbin change, the open-end spinning device of the job can pass. In a delayed allocation of suction, the control unit, for example, initially idle at the dwell, which would have a negative impact on the supply of other jobs and thus adversely affect the overall efficiency of the textile machine.

A comparable constellation is given if, as described in claim 3, a vacuum request received a job that is currently supplied manually by an operator.

In this case, too, a delayed fulfillment of the vacuum requirement of the workplace would result in the operator being held at the workplace for an unnecessarily long time and being unavailable for other, important work during this time.

According to claim 4 is also provided in an advantageous embodiment of the method according to the invention that vacuum requirements are treated with the same priority level of the central control unit according to the principle "first come, first served".

This ensures that all vacuum requirements are treated equally within a priority level so that all vacuum requirements of the workplaces are gradually met.

In a preferred embodiment, the vacuum requirements of the jobs done to the central control unit via CAN telegram.

By means of such CAN telegrams, it is ensured that a reliable allocation of the vacuum requirements to the respective work stations is ensured even if several negative pressure requirements are simultaneously received.

As described in claim 6, it is also provided that a maximum of twelve vacuum requirements of the workstations are served simultaneously by the central control unit. In experiments it has been found that in general the simultaneous supply of such a number of jobs with additional suction air is quite sufficient and that also in such a design, the dimensioning of the Suction system can be kept at an economically reasonable level.

The method step described in claim 7 also has an advantageous effect on the required dimensioning of the extraction system.

Due to the fact that every workstation, when its suction air requirement has been dealt with, logs off immediately at the central control unit of the textile machine and then the suction air supply for this work is set immediately, unnecessary suction air consumption can be prevented, with the result that for the reliable supply of a certain number of Work places the dimensioning of the suction system can be chosen smaller and therefore cheaper.

The device for carrying out the method according to the invention comprises, as described in claim 8, a central control unit, to which the control devices of the individual work stations of the textile machine are connected via a CAN bus.

In addition, the work stations are each equipped with a device that provides a pneumatically continuous connection of the

Employment allows the suction air system of the textile machine.

That means, if necessary, the working organs of a

Job, which also consume suction air, specifically connected to the Saugluftanlage the textile machine and with

Negative pressure to be supplied.

The vacuum supply is maintained only as long as absolutely necessary.

As set out in claim 9, the device described in claim 8 preferably comprises at least one defined switchable shut-off.

Such a shut-off, such as a pneumatically actuated slide, is safe and easy to control and represents a component that has proven itself in connection with Saugluftanlagen in practice.

The invention will be explained in more detail with reference to an embodiment shown in the drawings.

Show it:

FIG. 1 schematically shows a front view of a textile machine producing cross-wound bobbins, to which the method according to the invention is applied, FIG.

2 a workstation of a cross-wound textile machine whose vacuum requirements are processed in a central control unit of the textile machine,

3 shows a schematic diagram of the flow according to the invention for processing a vacuum request.

FIG. 1 shows a front view of a textile machine producing cross-cheeses, in the exemplary embodiment a

Open-end rotor spinning machine 5, shown.

Such textile machines have between their end frames 31, 32 a plurality of identical jobs 1, which are described in more detail below with reference to FIG 2.

In one of the end frames of the open-end rotor spinning machine 5, a vacuum source 30 of a machine-own suction system 20 is arranged.

The vacuum source 30 is acted upon by an electric motor drive 29, which is defined by means of a frequency converter with respect to its speed adjustable.

As indicated in Figure 1, the drive 29 and the associated frequency converter for this purpose via a Control line 33 connected to the central control unit 10 of the textile machine 5.

As can also be seen from FIG. 1, the central control unit 10 is also connected to the individual control devices 25 of the numerous workstations 1 via a bus system, preferably via a CAN bus 28.

Furthermore, an operating unit, preferably a so-called cleaning and changer trolley 7, is arranged on the textile machine 5, along the workstations 1. Among other things, this cleaning and changer cart 7 ensures that finished cross-wound packages are transferred from the creel frames of the work stations 1 to a bobbin removal belt (not shown) and that new empty bobbins are loaded into the bobbin frames of the workstations 1.

2 shows a perspective view of one of the numerous, largely self-sufficient workstation 1 of the open-end rotor spinning machine. 5

Such jobs 1 have, as known per se and therefore shown only schematically, including an open-end spinning device 2 and a winding device 3. In the field of open-end spinning device 2, before a so-called thread withdrawal tube 21, a piecing 16 is arranged which accepts after a yarn breakage or a controlled cleaner cut by a suction nozzle 4 of the cheese 8 8 retrieved thread and prepares the yarn end for Wiederanspinnen.

Furthermore, a thread withdrawal device 27 is present, which takes over both the removal of the spun yarn 9 from the open-end spinning device 2 during the regular spinning operation, as well as the re-spinning for a defined return of a prepared thread 9 in the open-end spinning device 2 provides. The winding device 3 is, as usual, from a creel 22 for rotatably supporting the cheese 8, a preferably acted upon by a reversible single drive 56 drive drum 23 and a Fadenchangiereinrichtung 24, which is driven for example by means of a stepping motor 57.

In front of the thread-changing device 24, a thread-centering device can also be arranged in the form of a pivoting centering plate.

Each of the jobs 1 also has a thread monitor 26, a paraffining device 17 and a pneumatically actuable storage nozzle 60, which stores the excess thread length during run-up of the job 1 and thereby ensures that the yarn produced in the open-end spinning device with a prescribed winding tension is wound up.

Both the storage nozzle 60 and the pivotally mounted suction nozzle 4 are connected to the machine-own suction system 20 via a defined controllable device 35, which preferably includes pneumatic connecting lines 11, 12, 13 and shut-off 14, 15.

That is, the pivotally mounted suction nozzle 4 is defined by means of a stepping motor 6 between a lying in the field of winding device 3 thread receiving position and a lying in the spinning device 2 yarn transfer position adjustable and connected via a connecting line 12 to a connecting piece 13, which in turn with the Saugluftanlage 20th the textile machine 5 is connected. The storage nozzle 60 is connected via a connecting line 11 to a connecting piece 13 accordingly. Preferably, in the region of the connecting piece 13, a defined controllable shut-off means 15 is arranged, while in the connecting line 12, a shut-off 14 is turned on.

The blocking means 14, 15 are connected via control lines 18 and 19 to the workstation's own control device 25 of each workstation 1.

The control devices 25 are in turn connected via a CAN bus 28 with the central control unit 10, which ensures that the closure means 14, 15, if necessary, according to the inventive method, which is described below with reference to FIG 3, opened or closed.

Function of the method according to the invention, explained with reference to the flowchart of FIG. 3:

If during the spinning process of the textile machine 5 at one or more work stations 1 beyond the normal Saugluftbedarf exceeding, increased Saugluftbedarf accrues, for example, after a thread break, the spinning device a job 1 to be re-spun and for this purpose accumulated on the cheese 8 thread the vacuum-pressurizable suction nozzle 4 is to be received and transported to the piecing element 16, the control device 25 of the relevant workstation 1 reports its vacuum requirement (UD) to the central control unit 10 via CAN telegram.

This first method step carries the reference numeral 40 in FIG.

In the next method step, which is identified by the reference numeral 41 in FIG. 3, it is checked by the central control unit 10 whether the maximum number of work stations 1 that can be supplied simultaneously with suction air has already been reached or if there is still capacity available for the workstation 1, the Vacuum demand (UD) has logged in to use. If the maximum number of work stations 1 that can be supplied simultaneously has not yet been reached, then in a third method step, which is identified by the reference numeral 42, it is checked whether the present low-pressure requirement is to be grouped into priority class I or only into priority class II.

If there is a vacuum request of priority class I, this is, as indicated by the method step 45, done immediately.

That is, from the central control unit 10 goes via the CAN bus

28 a signal to the controller 25 of the relevant

Job 1, which then ensures that the suction nozzle 4, which is positioned during the "normal" spinning process in a parking position and pneumatically separated from the Saugluftanlage 20, is pivoted from its parking position into a thread receiving position in which the suction of the suction nozzle 4 in is positioned in the immediate vicinity of the lateral surface of the cheese 8.

Furthermore, the controller 25 ensures that the

Suction nozzle 4 and the storage nozzle 60 are pneumatically continuously connected to the machine's own suction system 20.

That is, the shut-off means 14 and 15 of the device 35 are driven in the sense of "open".

Subsequently, the drive drum 23 is rotated in the unwinding, so that the accumulated after the yarn breakage on the lateral surface of the cheese 8 end of the thread can be absorbed by the suction nozzle 4.

The successful picking up of the thread 9 is preferably monitored by a sensor device (not shown) arranged inside the suction nozzle 4. The suction nozzle 4 is then pivoted by the stepping motor 6 down and passes the thread, as shown in the

DE 101 39 073 Al or in DE 101 39 075 Al DE is described in detail in detail, to the Anspinnorgans 16th

To transfer the thread 9 to the Anspinnorgan 16 is the

Suction nozzle 4 depressurized, that is, the closure means

14 is closed.

In the piecing 16, the thread is then cut to length, prepared and kept ready for Wiederanspinnen. Finally, the drive of the working thread take-off device 27 is controlled by the workstation computer 25 in such a way that a defined thread return takes place into the open-end spinning device 2.

That is, the prepared thread end of the thread 9 is applied to a circulating within the open-end spinning device 2 fiber ring, which is thereby broken.

The newly emerging thread 9 is then withdrawn via the thread withdrawal device 27 and, as already mentioned, wound on the winding device 3 on the cheese 8, which is accelerated at the latest at the beginning of the thread withdrawal by the thread withdrawal device 27 in the winding.

Since the open-end spinning device 2 accelerates much faster operating speed than the frictionally driven, possibly already quite large cross-wound bobbin 8, the winding speed of the winding device 3 is initially below the yarn delivery speed of the open-end spinning device 2, with the result that it is a thread excess comes, which is temporarily connected by the storage nozzle 60, which, as indicated above, through the open shut-off means 15 is pneumatically continuous with the suction air system 20 of the textile machine. That is, the thread 9, which passes on its way to the cheese 8, the mouth of the storage nozzle 60 is sucked in a loop shape by the pressurized storage nozzle 60 and thereby maintained at winding tension.

With increasing winding speed of the winding device 3, the thread loop decreases in the storage nozzle 60, which is monitored by sensors.

As soon as the thread loop has completely left the storage nozzle 60, the storage nozzle 60 is depressurized, that is, the control device 25 ensures that the closure means 15 is closed.

From the control device 25 also goes via CAN bus 28, the message to the central control unit 10 that at the relevant workstation 1 no vacuum demand exists.

If it should have been determined in method step 41 that the maximum number of workstations which can be supplied simultaneously with negative pressure has already been reached, it is first waited until a release has taken place from one of the workstations 1, which are currently supplied with negative pressure. This process step is indicated by the reference numeral 43.

If it is determined in method step 42 that the present vacuum request counts only for priority class II, this is only executed if there is no vacuum request UD of a workstation 1 that is classified in priority class I at this time.

Within their priority classes, the vacuum requirements UD of the workstations 1 are treated according to the principle "first come, first served", so that it is ensured that none of the vacuum request UD remains unprocessed for too long.

Claims

Claims: 1. A method for operating a cheese-producing textile machine, in particular for demand-based allocation of provided by a Saugluftanlage the textile machine suction on suction air requesting jobs of the textile machine, wherein a Central control unit of the textile machine ensures that the negative pressure in the suction air system does not fall below a certain minimum level, characterized, in that in the central control unit (10) of the textile machine (5) incoming vacuum requirements (UD) of the jobs (1) according to at least a first priority class (I) and a second priority class (II) are distinguished, wherein vacuum requirements (UD), in the first Priority class (I) are always preferred to be processed. 2. The method according to claim 1, characterized in that a negative pressure requirement (UD) of a job (1) then in the first priority class (I) is classified, if in connection with the supply of the relevant job (1) by a along the jobs (1) movable operating unit (7) takes place. 3. The method according to claim 1, characterized in that a vacuum request (UD) of a job (1) then in the first priority class (I) is classified, if it takes place in connection with a manual care of the relevant job (1) by an operator , 4. The method according to any one of the preceding claims, characterized in that the central control unit (10) the execution of vacuum requirements (UD) of the workstations (11), which have a same priority level of which controls on the principle of "first come, first served" , 5. The method according to any one of the preceding claims, characterized in that the vacuum requirements (UD) of the jobs (1) to the central control unit (10) via CAN telegram. 6. The method according to any one of the preceding claims, characterized in that a maximum of twelve vacuum requirements (UD) of the jobs (1) are operated simultaneously. 7. The method according to any one of the preceding claims, characterized in that each of the workstations (1), if no negative pressure requirement is present, by their control device (25) immediately at the central control unit (10) as "free" is logged off. 8. Textile machine with a plurality of jobs (1) for the production of cheeses (8), wherein each of the jobs (1) via a control device (25), via a CAN bus (28) to a central control unit (10) of Textile machine (5) is connected, and that each of the jobs (1) comprises means (35) which allows a pneumatically continuous connection of the relevant workstation (1) to the suction system (20) of the textile machine (5), for performing the method according to claim 1, characterized in that the central control unit (10) is designed so that it differs incoming vacuum requirements (UD) of the jobs (1) for at least a first priority class (I) and a second priority class (II) and the preferred execution of Vacuum requirements (UD), which are classified in the first priority class (I), controls. 9. Textile machine according to claim 8, characterized in that the device (35) has at least one defined controllable shut-off means (14, 15).