EP0995711B1 - Method for operating a working station in a winding machine - Google Patents

Description

The invention relates to a method according to the preamble of Claim 1.

A textile machine producing as cross-wound bobbins Winding machine is for example from DE 196 50 932 A1 known. Such so-called cross-winder machines have one Variety of jobs designed as winding units, the usually in the longitudinal direction of the winding machine are arranged side by side. For operation, monitoring and to control the winding machine is known, each winding station assign a separate workstation computer. The single ones Workstation computers are included via a machine bus connected to a central control unit of the winding machine.

To supply and dispose of their workplaces have such Automatic winding machines usually have a logistics facility in Form of a coil and tube transport system. In this Coil and core transport system run, upright on the Spines of transport plates standing, drain spools, so-called Spinning bobbins, or empty tubes around.

Furthermore, such winding machines have a Self-supplying service unit in the form a package changer. The package changer passes Completed bobbins from the winding frame of the Work place on a machine-long transport device, the the packages to a machine end Transfer station transported. Then that changes Service unit a new empty tube in the winding frame of the concerned job.

It is known during the winding of the yarn by one On a take-up spool under the running thread other by monitoring a thread tension sensor and the Thread tension by means of a thread tensioner on a maintain predetermined level. That is, by means of the Thread tensioner becomes an essentially constant thread tension of the running thread set to this way even winding of the thread on the package sure.

The current thread tension is known from DE 41 29 803 A1 (which represents the closest prior art) of the running thread with a thread tension sensor detect. Using one of these thread tension sensors performed thread tension measurement on the running thread is a Control signal provided for the thread tensioner, the a more or less large one according to the control signal Braking effect on the running thread. This will ensured that the yarn with a defined tension the package is wound.

It is also known to keep the thread running during the Rewinding process by a so-called thread cleaner to lead. This thread cleaner probes the running thread Irregularities, such as thick or thin spots. If such irregularities are recognized, the Thread cleaner triggered a controlled thread cut. Here the running thread is below the fault location separated so that a lower thread and an upper thread are created. The The upper thread, which has the defect, first runs on the bobbin because of its relatively large size The flywheel cannot be braked to an abrupt stop can.

The bobbin thread is controlled Thread cleaner cut mostly held and can in the thread tensioner by means of a so-called gripper tube to a Splicer are transferred where the lower thread end with the upper thread end, which is pivoted by means of a Suction nozzle is retrieved from the package surface, is connected.

It is also known to equip the winding machines with a so-called bobbin thread sensor, which detects the presence of the bobbin thread, since the presence of the bobbin thread is essential for successful thread connection.
As already explained above, in the case of a desired thread cut as a result of a detected thread irregularity, the lower thread is generally held by the thread tensioner, so that the lower thread sensor, which is arranged in front of the thread tensioner, as seen in the direction of travel of the thread, can determine the presence of the lower thread.

When operating the winder, however, can also Operating conditions occur, for example, on a Thread breakage or an idling of the payout reel are. If the thread breaks, the splicer analogous to connecting the lower thread and upper thread in one wanted thread cut, the upper thread and the lower thread searched and automatically reconnected. Is the pay off spool run empty or the thread breaks below the thread tensioner, is the absence of one by the bobbin thread sensor Bobbin thread detected. In such a case, the Workstation computer of the winding unit automatically one Coil changing device initiated, which ensures that the empty sleeve or due to the missing The spinning bobbin that can no longer be unwound against a new one The spool is replaced.

In particular in connection with a thread break above the thread tensioner, thread entanglement and / or loops of the lower thread can also occur on the payout spool.
This thread hooking or loops can have the result that, although the lower thread sensor detects the presence of a lower thread, the winding unit in question, despite repeated repetition of the thread connecting process, cannot be put back into operation automatically.

In the event of yarn entanglement and / or loop formation on the The pay-off spool is immediately reactivated when the winding unit is restarted a thread break occur. Among other things, it is disadvantageous that by repeatedly connecting and breaking the thread Loss of time occurs, leading to a drop in productivity the winding unit concerned leads.

It is an object of the invention to provide a method of the generic type Specify the type with which the productivity of the winding units increases becomes.

According to the invention, this object is achieved by a method with the solved in claim 1 features. As a result of that for example after a thread break and after it has occurred Connect the upper thread with the lower thread the thread tension through the thread tension sensor to a predeterminable one Target value of the thread tension lying actual value is checked, can exceed a limit, indicating a automatically indicates a source of error that cannot be rectified immediately recognized and immediately a replacement of the payout spool be initiated. In other words, it passes through the Thread tension sensor measured actual value a specifiable Limit value, it can be concluded that the thread, For example, a loop is hooked on the payout spool has formed or the like so that one of the pull-off force opposing restraining force acts on the thread, which leads to another thread break. It is therefore clear that every other Attempt to connect the lower thread with the upper thread would be unsuccessful, since immediately another thread break occurs. This fault can only be remedied by replacement the spool possible. By immediately recognizing this, can enter the winding unit via a workstation computer corresponding signal are triggered so that the Coil change is initiated immediately. Thus increased the productivity of this winding unit since the time for that repeated binding of the lower thread and the upper thread as well the re-detection of the thread break can be saved.

The omission of multiple, unsuccessful thread connection attempts also has a positive effect on the quality of the wound package, since with each thread connection attempt the suction nozzle for picking up the upper thread is swiveled to the surface of the package, which can loosen the already wound thread layers ,
Since it is immediately recognized with the method according to the invention that further thread connection attempts are useless, a corresponding repeated search (suction) of the upper thread from the package is avoided.

In a preferred embodiment of the invention it is provided that the target value with which the actual value is compared in one Storage unit of the workstation computer is stored. It is particularly preferred if the target value for all Winding stations of at least one winding machine by a central one Computer unit is specified together. This allows in a simple manner the target value depending on the yarn to be wound, for example its Strength properties, material thickness and the like, specify variably. This allows the specified target values changed according to the actual spooled thread become. This results in a very universal use of the inventive method. It is also preferred Embodiment of the invention provided that the target value during the operation of the winding unit depending on Operating parameters of the winding unit can be changed. In this way, for example, depending on one amount of yarn already uncoiled from the payout spool or itself changing ambient temperatures, for example influence the tensile strength of the thread to be wound, the target values optimally according to the actual circumstances to adjust. In this respect, the inventive method can be recognized with certainty whether it occurs Thread break is actually an irreparable entanglement or yarn the like.

Further preferred configurations of the invention result from the other features mentioned in the subclaims.

The invention is described below in one embodiment based on the accompanying drawing, which is a side view of a Bobbin shows, explained in more detail.

The figure shows a side view of one labeled 10 Bobbin of a textile machine producing cross-wound bobbins 1. Such textile machines known as automatic winder machines have a large number of juxtaposed Spooling stations 10, on which payout spools 12 (hereinafter also Spinning bobbins) to large-volume winding spools 14 (hereinafter also referred to as cross-wound bobbins). The Spinning heads 12 pass through a transport device 16 to the individual winding units 10. The transport device 16 as is known per se, does not include a large number in detail specified transport routes on which on Transport plates 20 attached, spinning heads 12 or empty tubes 18 are promoted.

From a spool 12 located in winding position I. pulled a thread 22. The thread passes through the spinning cop 12 22 in the thread running direction 24 on its way to the package 14 first a bobbin thread sensor 28, which is connected to a signal line 30 is connected to a workstation computer 32.

By means of this lower thread sensor 28, for example, after a thread break or a controlled cleaner cut Initiation of the upper thread search, determined whether at all Bobbin thread 34 is present.

A thread tensioner 36 is located above the lower thread sensor 28 arranged. The thread tensioner 36 includes not shown Brake actuator, which is exerted on the running thread 22 Contact pressure via a signal line 38 from the Job computer 32 can be controlled.

Outside the regular thread travel path, a thread end connecting device 40, which is designed, for example, as a pneumatic splicer, is arranged. The splicing device 40 is also connected to the workstation computer 32 via a signal line 42.
A thread cleaner 44 is arranged in the further course of the thread path in order to detect yarn defects. The quality of the running thread is constantly monitored by means of the thread cleaner 44. The signals of the thread cleaner 44 are fed to the workstation computer 32 for evaluation via a signal line 48. When a yarn error occurs, the workstation computer 32 actuates a cutting device 52 via a signal line 50 and the thread 22 is separated.
A thread tension sensor 54 and a paraffinizing device 46 are also arranged in the thread running direction 24 after the thread cleaner 44. The thread tension sensor 54 is also connected to the workstation computer 32 via a signal line 56. During the regular winding operation, the thread tension force of the running thread 22 is continuously monitored by means of the thread tension sensor 54 and the thread tensioner 36 is controlled via the workstation computer 32 in accordance with the signals supplied by the thread tension force sensor 54. This means that the brake actuators of the thread tensioner 36 apply a contact pressure to the thread 22, which ensures that an essentially constant thread pull force is set on the running thread 22, which ensures a uniform packing density of the finished package 14.

The paraffinizing device 46 is followed by a deflection device 58 in the thread running direction, via which the thread 22 runs onto a winding drum 60, a so-called grooved drum, which ensures that the thread 22 is laid crosswise, in particular according to the 'wild winding' type of winding.
The cross-wound bobbin 14 is rotatably mounted on a pivotally mounted winding frame 64 via a sleeve (not shown in more detail) and lies with its outer circumference on a single-motor-driven winding drum 60, which takes the cross-wound bobbin by friction.

The winding unit 10 further comprises a suction nozzle 66 and a gripper tube 68.
The gripper tube 68 serves to grasp the lower thread 34 originating from the spinning cop 12, which is usually held in the thread tensioner 36 in a controlled thread cleaning cut or in the event of a thread break above the thread tensioner.
The gripper tube 68 can be pivoted about an axis of rotation 72 along the movement path 74 shown in dashed lines and is connected to a central vacuum supply 76 of the winding machine, which is connected to a vacuum source 78. The pivoting of the gripper tube 68 is triggered by a signal provided by the workstation computer 32, via a drive device known per se and therefore not shown in detail.

The suction nozzle 66 serves for gripping the cheese 14 accumulated upper thread 80. For this purpose, the suction nozzle 66 is one Axis of rotation 82 can be pivoted such that its mouth 84 a Trajectory traverses 86. The suction nozzle 66 is also included the vacuum supply 76 connected. The pivotal movement of the Suction nozzle 66 is through the workstation computer 32 Driving a known, not shown Drive device, preferably a cam disk package, triggered.

The winding unit 10 includes other mechanical, electrical and pneumatic components under the present Description should not be explained in more detail.

The winding unit 10 shown in the figure shows the following Function:

Breaks during rewinding in rewinding position I standing spinning cops 12 on the package 14 of the thread 22nd or is the thread 22 due to a corresponding Error signal of the thread cleaner 44 by the Thread cutting device 52 separated, is reduced abruptly the pending on the thread tension sensor 54 Yarn tension. In addition, the thread cleaner 44 remains delivered dynamic thread signal.

The workstation computer 32 then performs the following actions out:

Via a drive device, not shown, is immediately the winding frame 64 is lifted off the winding drum 60 and thereby prevents the on the peripheral surface of the cheese 14th running thread end (upper thread) through the winding drum 60 so is rolled that it is no longer later through the suction nozzle 66 is recordable. The cheese 14 is also by a Coil brake (not shown) braked to a standstill.

In addition, the lower thread sensor 28 detects whether there is a lower thread 34.
This means that the lower thread sensor 28 immediately signals by means of a corresponding signal whether a lower thread 34 is present at all. If there is no such signal from the lower thread sensor 28, this means that either the spinning head 12 has run empty or that the lower thread 34 cannot be picked up for the hook tube 68.
In both cases, the thread connection process is aborted via the workstation computer 32 and a so-called cop change circuit is triggered immediately, that is to say the spinning cop in the winding position I or the empty tube is automatically exchanged for a new spinning cop 12.

With a positive signal from the lower thread sensor 28, a Thread end connection process started.

This means that the gripper tube 68 first becomes such controlled that its mouth in the thread path of the thread 22 arrives and the lower thread 34 engages. Then that will Gripper tube 68 pivoted along the path 74, so that the gripped lower thread 34 into the splicer 40 is inserted.

Following or at the same time, the upper thread take-up started.

For this purpose, the mouth 84 of the suction nozzle 66 is pivoted to the circumference of the cheese 14 and the winding drum 60 is driven counter to the winding direction, so that the cheese 14 rotates backwards. Due to the negative pressure present at the mouth 84 of the suction nozzle 66, the upper thread 80 is picked up by the surface of the package 14 and optionally cleaned by means of a thread cutting and sensor device (not shown) arranged within the suction nozzle 66, i.e. the defective thread piece of the upper thread is removed cut off. The suction nozzle 66 is then pivoted downward along the movement path 86, so that the upper thread 80 is likewise inserted into the splicing device 40.
The upper thread 80 is brought into contact with the thread tension sensor 54 and also threaded into the thread cleaner 44 by the suction nozzle 66.

The splicing device 40 is then via the control line 42 causes the lower thread 34 with the upper thread 80 to swirl.

Subsequently, the Coil frame 64 lowered again, so that the cheese 14 with the winding drum 60 comes into contact. The thread winding process 22 is thus continued. The resulting thread tension (Thread tension) is immediately via the thread tension sensor 54 detected and corresponding signals via the control line 56 Job computer 32 forwarded. In the job computer 32 become the signals supplied by the thread tension sensor 54 constantly with a target value stored in a storage unit 90 compared. This is the target value for the thread tension either for each winding unit 10 or for all winding units 10 a winding machine 1 can be specified. The target value can depend be of a quality, thickness, type of material or the like of the thread to be wound 22. This target value can either permanently, for example for different threads 22 in be stored in the memory element 90 or is via a central computer unit 94, which is indicated here Machine bus 92 is connected to the workstation computer 32, centrally specified. The job computer 32 includes one Comparator 96, the predetermined target value with the immediately after restarting the winding process from Thread tension sensor 54 compares the actual signal supplied. If the ascertained actual value is a predetermined limit value, which a subsequent thread break precedes, this will from the job computer 32 automatically as a not correctable error interpreted, for example as a hooking of the thread 22 on the spinning head 12 or a loop. In this case, the workstation computer 32 does without further, of futile connection attempts and leads immediately change the payout spool.

By immediately recognizing one, at least automatically irreparable thread breakage, for example as a result of snagging or looping of the thread 22 on the spinning cop 12, can immediately an exchange of the spinning cop 12 in question is initiated become. A subsequent one, via the transport device 16 ready spinning cops 12 can thus directly into the Run position are transferred and its lower thread 34 with the upper thread 80 are connected in a known manner.

Overall, the method according to the invention not only leads to an improvement in the efficiency of the individual winding units 10 of the winding machine 1 and thus to an increase in Productivity of the textile machine but by the total lower stress on the package surfaces too an increase in the quality of the packages.

Claims (11)

1. Method for operating a work station of a bobbin winding machine (1) comprising a yarn tension sensor (54) connected to a control device for monitoring the yarn tension of a yarn (22) running from a delivery bobbin (12) to a take-up bobbin (14), a yarn tensioner (36) for regulating the yarn tension, a splicing device (40) for the automatic connection of the yarn end of the delivery bobbin (12) (lower yarn) to the yarn end of the take-up bobbin (14) (upper yarn) following a yarn break or a yarn cleaning cut, and a bobbin exchange device for exchanging delivery bobbins which cannot be further unwound, characterised in that after connecting the upper yarn to the lower yarn, the yarn tension is monitored by the yarn tension sensor (54) and if it exceeds a predeterminable threshold the bobbin exchange device is loaded in accordance with 'delivery bobbin exchange' by the control device.
2. Method according to claim 1, characterised in that the actual value of the yarn tension determined from the yarn tension sensor (54) is compared with a yarn tension desired value in the control device of the relevant winding head designed as a work station computer (32).
3. Method according to claim 2, characterised in that the desired value is stored in a memory unit of the work station computer (32).
4. Method according to any of the preceding claims, characterised in that the desired value is predetermined for each winding head of the bobbin winding machine.
5. Method according to any of claims 1 to 3, characterised in that the desired value is predetermined jointly for all winding heads of the bobbin winding machine.
6. Method according to any of the preceding claims, characterised in that the desired value is predetermined as a function of a properties of the yarn to be processed.
7. Method according to any of the preceding claims, characterised in that the desired value for different yarns is permanently stored in the memory unit of the work station computer.
8. Method according to any of the preceding claims, characterised in that the desired value for different yarns is provided up-to-date by a central computer unit to which the work station computers are connected by a bus.
9. Method according to any of the preceding claims, characterised in that the actual value is compared with the desired value by a comparator of the work station computer.
10. Method according to any of claims 1 to 8, characterised in that the actual values of the individual winding heads are compared with a common desired value for all winding heads in the central computer unit of the bobbin winding machine.
11. Method according to any of the preceding claims, characterised in that the desired value can be changed during the operation of the winding head as a function of operational parameters of the winding head.

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