EP0427990A2 - Device for performing automatically thread splicing as well as cop changing, presenting operations in a fixed order, at a winding position of a winding machine - Google Patents

Abstract

The device has the task, compared to known devices, of shortening the average time required for cop changing operations and of avoiding unnecessary thread damage during the thread connecting cycle.

This object is achieved in that the thread connecting and bobbin changing device contains control circuits which monitor the success of steps within the sequence of steps of thread connecting and bobbin changing and, if necessary, control their repetition in the case of faulty steps.

In particular, this monitoring relates to the control of the detection of the take-up spool (35 ') and the take-up spool thread (35 ") and the subsequent repetition of the thread detection. Also included is the repetition of bobbin-changing processes which are not used to provide the take-up spool thread (35') The thread is monitored by means of the electronic thread cleaner (27) which is present in any case, or by means of sensors (45) on the feeder (24) for the thread (35 ') on the supply reel side or on the suction nozzle (34) for the thread (35 ") on the winding spool side , 70).

Description

The invention relates to a device according to the preamble of the first claim.

In known devices for automatically performing the thread connection, various approaches have been taken to monitor this thread connection process and thus to improve the degree of automation and productivity.

From CH-PS 459 836 it is known to differentiate between three different causes for the interruption of the thread run by means of an electronic thread monitor. In a first case, the thread interruption is brought about in that a thread separating device is actuated by means of the electronic thread monitor due to the detection of a thread defect (thick or thin spot). In a second case, a thread break occurs between the electronic thread monitor and the package.

In these two cases, the bobbin thread coming from the payout bobbin is present and can be fed to the bobbin of the thread connecting device by means of corresponding feed elements. It follows that a cop change is not necessary.

While in the first case the bobbin change is blocked by the fact that the separation pulse is present, in the second case the thread end after the thread break is still in the thread cleaner, so that only a simple thread connecting process is initiated here.

In the third case, the thread break below the electronic thread cleaner, the thread cleaner recognizes the passage of the thread end. This signal then leads to a change of the cop. With this device, it is therefore not possible to prevent the bobbin change in the event of a thread break not caused by the separating device or under the thread cleaner. As a result, cops are also ejected that can still carry a large amount of wrapping.

From DE-OS 21 53 370, among other things, it is known to additionally use a so-called computing button, which detects whether a lower thread is still present between the pay-off spool and a thread brake located downstream. Apart from the fact that this probe is to be additionally provided, it must be very sensitive and precisely adjusted, since it must also be able to determine the presence of a thread at rest.

For these reasons in particular, such computing keys are mostly dispensed with today. However, this means that the thread of the lower thread is only checked after the thread has been connected.

From DE-AS 19 30 180 it is known to provide a thread connecting device in an automatic winding machine which has a thread testing device with two measuring slots. Through appropriate baffles Thread connecting device, the threads of the take-up spool and the take-up spool, which are detected at the same time, are introduced into separate measuring slots by means of guide plates. If one of the two thread ends is not present or is in poorly prepared form, the thread search for both thread ends is repeated completely. The cop change is not addressed in this document.

From DE 38 24 837 A1 and DE 39 23 333 A1, which is not prepublished in relation to part of the present application, methods and devices for thread connection are known which use the electronic thread monitor which is present anyway to monitor the presence of the two thread ends during the thread connection cycle . The basic principle set out in these two documents consists in differentiating between the causes of the failed attempts in the event of an unsuccessful thread connection process after completion of the first or further thread connection cycles which have not led to a thread connection. If the upper thread is missing several times, a maintenance signal is generated, while if the lower thread is missing, a bobbin change is carried out.

DE 39 23 333 A1, however, still leaves open the possibility of changing the bobbin as part of the first thread connection cycle. The differentiation required for this is carried out using the same means which are already known from the above-mentioned CH-PS 459 836. However, as already explained in connection with this document, cops are increasingly ejected in this way, which can still bear a large amount of wrapping. In particular, the detection of the passage of the thread end through the cleaner is associated with large uncertainty factors, which can lead to more or less frequent switching errors depending on the thread material. Thus, such a solution is not a satisfactory alternative to the solutions in which the entire thread connection cycle with greater loss of time and the risk of damage to the upper layers of the package due to the repeated thread search, which would not be necessary due to the missing thread on the package side, runs several times in succession.

It is an object of the invention to develop a device of the type mentioned in such a way that the number of ejected remaining heads and the time required for thread connection operations are kept low and the stress on the upper thread was reduced to the required amount of the package.

This object is achieved by the characterizing features of claim 1 or 17.

The solution according to the invention according to claim 1 makes it possible to determine the availability of a lower thread without additional monitoring devices. This avoids, on the one hand, that a cop change is carried out, even though the cop still contains a quantity of residual thread that can be unwound. On the other hand, it is avoided that an entire thread connecting cycle is carried out, even though the bobbin has already expired. This thread connecting cycle, which takes between six and ten seconds depending on the design of the thread connecting device, would run uselessly at least once for each cop. In contrast, the invention makes it possible to initiate the bobbin change immediately after recognizing the missing lower thread.

The invention according to claim 1 is advantageously further developed by claims 2 to 16.

Since the search for thread on the pay-off spool and the take-up spool takes place at different times, the stress on the surface of the take-up spool is limited only to the cases in which the thread coming from the payout spool is present. A repeated search for the thread on the winding spool is therefore only carried out if the thread on the winding spool could not be detected the first time after presentation of the thread on the winding spool. The search for the thread on the take-up spool (upper thread) and thus stress on the surface of the take-up spool can be preceded by several attempts to detect the thread on the take-up spool (lower thread) and one or more bobbin changes.

The arrangement, for example, of a blowing device in the area of the payout spool makes it possible to detect the beginning of the thread at almost any point on the payout spool and to feed it to the feeder. This results in particular in the advantage that a thread torn during unwinding on the payout reel can be fed again. In addition, a thread end which has not been caught by the feeder and has fallen again can be fed to the feeder again when the blowing device is actuated again.

In order to avoid compressed air losses on the one hand and to pull off only a limited thread length from the drain body, the duration of the actuation of the blowing device is limited and coordinated with the movement of the feeder. The extension of the blowing time in a repeated attempt to feed the beginning of the thread to the feeder should therefore be attempted, since a thread end that was not detected during the first attempt is generally more difficult to solve.

The control of the remaining amount of remaining yarn on the payout spool serves the purpose of avoiding a repetition of the thread detection when the payout spool is empty or contains only such a small amount that does not justify a new thread connection. The determination of the amount of remaining yarn by the winding station computer is particularly advantageous, since in this way the additional effort caused by a sensor is avoided.

The arrangement of a sensor in a waiting position of a payoff spool adjacent to the unwinding position makes it possible to avoid unnecessary repetition circuits in the absence of a reserve scope, which would ultimately lead to the generation of a maintenance signal for the operator, although maintenance is not required, since when a new scope arrives in the waiting position, all steps can be carried out automatically. The return to the zero position is particularly advantageous because in it all the individual units of the thread connecting device, in particular the air nozzles, are out of operation.

The rechecking of the detection of the end of the thread on the take-up spool after changing the cop increases the certainty that a search for the thread on the take-up spool is limited only to the cases in which the take-up thread is present. In this way, several bobbin changing operations can be carried out with a subsequent thread check in a thread connection cycle.

In particular in the case of cop changing devices of the type described further below, it is possible to move back only up to approximately the middle of the actuation cycle of the cop changing device and to be able to completely end the cop changing process during the subsequent forward run. This saves switching time in the event of a repeated cop changing circuit.

Due to the staggered movement of the feeder for the thread on the take-up spool and the suction nozzle for the thread on the take-up spool, it is also possible to repeat the attempts to detect the take-up side thread independently of the detection of the take-up thread.

Analogous to the extension of the blowing time when feeding the supply-side thread to the feeder, the search time can also be extended in the second or third attempt when searching the supply-side thread.

When using a common cam arrangement for the thread connecting members of a winding unit, this search time extension can be achieved by stopping the cam arrangement during the thread search. It is also possible during this time, controlled by the winding unit computer, to reduce the return speed of the reversing thread roller and thus the take-up spool.

In the secondary variant of the invention, which is protected under claim 17, the additional effort of a sensor on the feeder was assumed, but compared to the first variant there is the advantage that the failure to feed the filament side thread to the feeder is detected earlier. This avoids unnecessary movement of the feeder into the thread insertion position, which means that the second thread detection attempt can be started earlier and time is saved.

• Fig. 1 eine Seitenansicht einer Spulstelle mit Fadenverbindungseinrichtung und Kopswechseleinrichtung nach dem Bereitlegen des ablaufspulenseitigen Fadenendes,
• Fig. 2 die Spulstelle nach Fig. 1 nach dem Bereitlegen des auflaufspulenseitigen Fadenendes,
• Fig. 3 ein in Fig. 3a und 3b als Gesamtheit enthaltenes Flußdiagramm des Fadenverbindungszyklus' einschließlich Kopswechsel,
• Fig. 4 ein zeitliches Ablaufschema des Fadenverbindungs-/Kopswechselvorganges gemäß vorliegender Erfindung anhand der Stellungen einer für die Steuerung der Fadenverbindungsorgane vorgesehenen Kurvenscheibenanordnung,
• Fig. 5 eine erfindungsgemäße Variante zu Fig. 4 und
• Fig. 6 eine weitere erfindungsgemäße Variante zu Fig. 4.

The invention will be explained in more detail below using exemplary embodiments. In the accompanying drawings:

• 1 is a side view of a bobbin with thread connecting device and bobbin changing device after preparing the thread end on the bobbin side,
• 2 shows the winding unit according to FIG. 1 after the thread end of the winding package has been provided,
• 3 shows a flow diagram of the thread connecting cycle, including the bobbin change, contained as a whole in FIGS. 3a and 3b,
• 4 is a timing diagram of the thread connection / cop changing process according to the present invention based on the positions of a cam disk arrangement provided for the control of the thread connection members,
• Fig. 5 shows an inventive variant of Fig. 4 and
• 6 shows a further variant of the invention according to FIG. 4.

In an automatic winding machine, a certain number of winding units 1 are arranged side by side. Each winding unit 1 has a winding unit frame 2 which carries all the components of the winding unit. Two conveyor belts 8 and 9 run along the winding stations. The conveyor belt 8 guides cops 4 and the conveyor belt 9 sleeves 5, which are each placed upright on pallets 3.

The pallets 3 lie only partly on the conveyor belt 8 during their transport, since it is narrower than the base plates of the pallets. A lateral guide 8 'ensures that the base plates of the pallets 3 protrude during transport on the conveyor belt 8 in the region of conveyor belts 6, which extend transversely to the conveyor belt 8 and each of the winding units 1 are assigned.

The conveyor belts 6 are deflected by deflection rollers 10 and 11 and transport in the direction of arrow 7. The conveyor belts 6 can be driven individually or in groups. But he can also directly from one of the Conveyor belts 8 or 9, for example, can be removed using tensioning rollers and bevel gears.

If three pallets 3 are stowed in front of the unwinding position on the conveyor belt 6, the pallets passed on the conveyor belt 8 cannot reach the conveyor belt 6, since they slide past the base plate of the last jammed pallet 3. In the state shown in FIGS. 1 and 2, the pallet 3 brought up on the conveyor belt 8 is picked up by cops 4 from the faster running conveyor belt 6 and conveyed into the branch path of the winding unit 1.

In the unwinding position, a cuff 17 is arranged, which is divided lengthways and consists of two cuff halves. The cuff halves can be successively removed from the region of the transport path formed by the conveyor belt 6 by means of hydraulic cylinders 13 and 19. The hydraulic cylinders 13 and 19 are fixed on stands 12 and 20.

The conveyor belt 6, together with the actuating device for the two cuff halves formed by the hydraulic cylinders 13 and 19, forms the cop changing device, the functioning of which will be described below.

As can be seen from FIGS. 1 and 2, the two hydraulic cylinders 13 and 19 lie on an axis which forms an angle of approximately 45 degrees with the transport direction of the conveyor belt 6. Since the hydraulic cylinders 13 and 19 are each mounted approximately in the middle of the two sleeve halves, the axis formed by the hydraulic cylinders 13 and 19 intersects an imaginary plane running through the joints of the sleeve 17 at approximately a right angle. The sleeve half supported by the hydraulic cylinder 13 has a stop element 18 which stops the pallet 3, which carries a cop 4 in the unwinding position, and in this position during the Unwinding keeps. If the hydraulic cylinder 13 is now actuated, the rear half of the sleeve in the transport direction of the conveyor belt 6 is moved out of the transport path, as a result of which the stop element 18 releases the pallet 3 in the unwinding position. The conveyor belt 6 conveys the pallet 3 with the unwound sleeve 5 up to the conveyor belt 9 against a leading edge 9 '. The conveyor belt 9 then transports this sleeve 5 on its pallet 3 to a point where it is pulled off, or directly to a spinning machine.

Then this cuff half is moved again over the conveyor belt 6 and at the same time the front cuff half is pulled back by means of the hydraulic cylinder 19. As a result, the next available pallet 3 with a cop can move into the sleeve 17. Subsequently, this cuff half is again moved over the conveyor belt 6, thereby closing the cuff 17. To accelerate the cop changing process, however, it is also possible to withdraw both cuff halves from the transport path at the same time, which means that the empty sleeve is also removed and a new cop 4 is provided in the unwinding position at the same time. Since the stop element 18 detects the pallets 3 in each case on a base-like structure, the distance between adjacent pallets is large enough not to impede the stop element 18 after the pallet carrying the empty sleeve 5 has been released when entering the transport path and stopping the subsequent pallet .

After the cuff halves have been closed, blow nozzles 14 to 16, which open tangentially and obliquely upwards into the cuff 17, blow the thread beginning provided either on the sleeve tip or in the sleeve upwards. In doing so, it reaches the area of the suction opening 25 of a feeder 24, which at this time assumes a position directly above the cuff 17. The feeder is over one Connection not shown here connected to a suction traverse 31 which supplies the entire winder with suction air.

Before blowing up the beginning of the thread from the cop 4, a scissor-like thread loosening device 21 is opened by means of an actuating device 22 so that the thread can reach the suction opening 25 without obstacles. Optionally, a balloon limiter 43 can also be arranged within the sleeve 17, which is also advantageously pivoted out of the thread path during the blowing out of the thread catcher. For this purpose, one of the cuff halves can have a pocket into which this balloon limiter 43 can be inserted. In addition, a clamping device (not shown) can be arranged in the feeder 24 or at its mouth, the suction opening 25, which securely holds the detected thread start during the subsequent pivoting movement of the feeder 24. In addition, there is the possibility of roughening the edge of the suction opening so that the thread cannot slide out of the feeder 24 again. The feeder 24 can have a sensor 45, which is connected via a signal line 45 'to a central control unit 42 and can transmit the detection of the beginning of the thread by the feeder to the central control unit 42.

As can still be seen from FIG. 1, a sensor 68 is arranged on the sleeve 17, which, as will be explained later, detects the amount of remaining thread on the cops 4 in the unwinding position. This sensor is also connected via a signal line 68 'to the central control unit 42.

Another sensor 69, which is connected via a signal line 69 'to the central control unit 42, monitors the presence of a cop 4 or a pallet 3 in the waiting position before the unwinding position. The recovery of the Information transmitted by this sensor 69 will be described further below.

During the normal winding process, the thread 35 is withdrawn from the bobbin 4 in the unwinding position, through a thread tensioner 23, an electronic thread cleaner 27 and a cutting and clamping device 28, past a thread catching nozzle 29 connected to the suction traverse 31 via a suction arm 30 and fed by a thread guide 32 to a package 38 forming the package. This cheese is driven by a reversing thread roller 37 by friction. This reverse thread roller also has the function of thread laying for the formation of the cross-winding. The cheese 38 is mounted on a pivotable bobbin frame 39. This coil frame 39 is pivotable about a pivot shaft 40 from a position 39 'at the start of the winding process until the predetermined maximum coil size is reached and also for lifting off the reversing thread roller 37. A frame opener lever 41 is provided for removing the bobbin 38 from the bobbin frame 39 by hand.

In the following, the flow diagram shown in FIG. 3 is used to show which switching operations take place during a thread connection cycle, possibly with an included bobbin change.

As long as the thread running signal (dynamic thread signal in the electronic thread cleaner 27) is present, the normal winding operation takes place, that is, the thread connecting device and the bobbin changing device are out of operation. If the thread running signal is no longer available, the fill level of the cop 4 is queried either via the sensor 68 or think here with a central control unit 42 called winding unit computer. If this level is sufficient, after a counter Z1 is zeroed, in which previously from a thread was stored in the preceding thread connecting process, the lower thread detection was initiated. This counter Z1 counts the unsuccessful attempts of the bobbin thread detection. It is set for a certain value, normally 2. The bobbin thread 35 is to be understood as the bobbin side.

As already described, this thread is detected by means of the feeder 24, to which the beginning of the thread is fed by the spiral air flow generated in the sleeve 17. The presence of the lower thread is then queried. This can happen at a time when the feeder 24 has reached its uppermost position shown in FIG. 1. This position of the feeder 24 can be indicated, for example, by a contact attached to the axis of rotation of the feeder, which is connected to the central control unit 42 via a signal line 24 '. Receives the central control unit 42, the corresponding position signal of the feeder 24, the presence of a static thread signal via the signal line 27 'is queried in the electronic thread cleaner 27.

In a variant of the invention, this query can already take place if the feeder is still in a lower position after actuation of the blowing nozzles 14 to 16. 2, a sensor 45 is arranged in the thread path within the feeder 24, which detects the arrival of the thread and transmits it via the signal line 45 'to the central control unit 42. In this variant of the invention, the information about the presence of the winding spool thread 35 'is available at an earlier point in time, which, as will be described later, can save time.

If the lower thread is present, the transition to upper thread detection takes place. If it is not present, the counter Z1 is increased by 1. Subsequently, it is queried whether the counter Z1 has reached a value greater than or equal to n, as already explained, normally 2.

If the counter Z1 has reached a value less than n, that is to say for example 1, the cam disk arrangement is returned to the starting point of the bobbin thread detection. The feeder 24 is then with its suction opening 25 again in the lower position 25 '. This is followed by a new advance of the cam disc arrangement, which ends with the query of the bobbin thread detection.

If the counter Z1 has reached the value n, the need to change the cops is derived from this. This begins by querying the sensor 69 as to whether a cop 4 with a pallet 3 is available for the change in addition to the unwinding position.

If this sensor 69 can report the presentation of a cop 4 to the central control unit 42 via the signal line 69 ', the cop exchange circuit already described above follows. In order to be able to lay the beginning of the thread of the new cop ready, the suction opening 25 of the feeder 24 must already have assumed the lower position 25 'again. The suction opening is pivoted along the feeder pivot path 33.

After the new bobbin thread detection again, a query is made regarding the presence of the bobbin thread. If this is not available, the drive for the cam disk arrangement is switched to return until the starting position for another cop change is reached.

Of course, this second attempt also asks whether a cop is in the process of being submitted.

Since at least the possibility cannot be ruled out that a defect is present in the blowing device formed by the blowing nozzles 14 to 16 or the feeder 24, a counter which is not built into the flowchart and which does not exist after a predeterminable number of cop changes can also be present has led to a bobbin thread detection, switches the winding unit off and triggers a maintenance signal.

If it has been determined that there is no cop 4 in the template, the cam arrangement is returned to the zero position as far as possible, so that it is also ensured that no nozzles or valves remain open until a new cop arrives. After a cop arrives before the unwinding position, the signal for sensor 69 can be used to restart the drive for the cam arrangement.

In the flow chart shown in Fig. 3 it is provided that even with a low fill level of the cop 4 in the case of the presentation of a lower thread 35 'the further thread connection steps can be initiated. This procedure is particularly advantageous when the residual roll has not been recorded very precisely. At least it can be ruled out that an empty tube 5 is present if a lower thread could be presented. If a sensor 68 is dispensed with and the remaining amount of yarn is detected by the winding station computer, which registers the amount of yarn rewound after changing the bobbin by means of the revolutions of the bobbin drive roller 37, for example, due to possible deviations in the winding length of the bobbins, the winding state is not exactly accurate determine. In such a case in particular, it is advantageous if a thread connection is made when the lower thread is presented in order to avoid waste. In any case however, there is no possibility that the bobbin thread detection will be repeated if there is no minimum fill level of the drain body.

In the case of a very exact detection of the fill level, in a modification of the flow diagram in FIG. 3, there is also the possibility of initiating the bobbin change, regardless of the detection of the lower thread, if an empty tube 5 or an extremely small amount of winding is detected.

After inserting the winding end thread end 35 'in the electronic cleaner 27 and the cutting and clamping device 28 and checking this thread template (Fig. 1) begins the detection of the winding spool thread. In Fig. 1, the suction nozzle 34 is already pivoted from its lower rest position 34 'into its upper position. It must be ensured in any case that the supply of the suction nozzle 34 with suction air via a connection (not shown here) to the suction crossbar 31 does not begin before the presence of the lower thread has been confirmed.

While a vacuum is present in the suction nozzle 34, the reversing thread roller 37 and thus also the cheese 38 rotate backwards. This enables the thread end 35˝ on the package side to be gripped by the suction nozzle 34.

Before the start of the detection of the thread end 35 auf on the package side, an existing counter for the upper thread detection Z2 = zero is set in order to be able to count only the failed attempts of the respective thread connection process. After the upper thread detection and the pivoting of the suction nozzle 34 along the pivot path 36 to the rest position 34 '(Fig. 2), the presence of the upper thread in the electronic cleaner 27 is also queried. The time of the query can be determined, for example, by a signal from an initiator 44, who recognizes the lower position of the suction nozzle 34 when it is damped by a nose 34˝ attached to the axis of rotation of the suction nozzle 34. This position of the suction nozzle 34 is reported by the initiator 44 via a signal line 44 'to the central control unit 42. Of course, it is of course also possible to monitor the position of the suction nozzle 34 and also the feeder 24 by the respective position of the cam arrangement.

If it was recognized in the electronic thread cleaner 27 that the upper thread is also ready, the actual thread connection process is initiated. For this purpose, a splicer prism 26 'a splicer 26, the two threads are fed. Such a splicing device is known, inter alia, from DE-A 31 32 895. The thread ends are shortened, sucked into suction nozzles arranged above and below the splice chamber, dissolved and pulled out of the prism by such an amount that there is a predetermined overlap of the thread ends. The splicing process is then carried out by one or more blasts of compressed air in the splicer prism 26 '.

After the splicing, the thread 35 is released again, after which the reversing thread roller 37 starts up and thus the winding process starts again. The splicing connection or the thread running signal is then checked again by the thread cleaner 27. If this splice connection lies within the specified tolerance range, that is, if no significant deviations in the cross-section of the thread have been found, the normal winding process is continued.

If the upper thread could not be detected, the counter Z2 is increased by 1. If the value of the counter Z2 then reached is below a predetermined number n, which is usually 2 or 3, the drive for the cam disk arrangement is on Return set until this reaches a position in which a repetition of the upper thread detection is possible. When the counter Z2 reaches the value n, the winding unit is deactivated and a maintenance signal, for example a red light, is generated.

The logic flow of the circuit can be seen from the flow chart shown in FIG. 3, but the exact time flow is not. 4 to 6, which each contain variants of the invention which differ from one another, serve to explain this time sequence.

Although there are a multitude of options for actuating the individual units of the thread connecting device, a cam disk arrangement has proven to be expedient in practice, which is attached to a common shaft and consequently has a common drive. A second common cam disk arrangement is advantageously provided for the cop changing device, which, if necessary, is coupled to the cam disk arrangement of the thread connecting device, as described later. Such cam disk arrangements in general, and also in particular for the thread connecting and bobbin changing devices on winding machines, are known, which is why there is no need to go into them here.

4 to 6 it is assumed that a complete thread connection cycle corresponds to a complete revolution of a cam arrangement. Selected work steps are therefore plotted in this cycle over a total of 360 degrees.

In all three variants the start takes place with the movement of the feeder into an initial position 46 for the thread take-up (corresponds to the position in FIG. 2). The suction opening 25 moves from an upstream of the transport direction of the Conveyor belt 6 lying position in a position above the sleeve 17 25 '. In the zero position of the feeder 24, the suction opening 25 is arranged behind the actuating device 22 for the twine loop release device. This zero position of the suction opening 25 is necessary in order not to hinder the thread running during the normal winding process. Since it is obvious, the zero position was not shown. In addition, as already shown, the suction opening 25 would be covered by the actuating device 22 anyway. The movement of the feeder 24 from the zero position to its ready position, that is to say the starting position 46 for the thread take-up, is indicated by an arrow 61. In the variants shown in FIGS. 4 and 5, the phase of the lower thread detection identified by arrow 47 immediately follows, which ends with query 49 for the presence of the lower thread. This phase indicated by arrow 47 includes the actuation of the blowing nozzles 14 to 16, the suction of the thread beginning 35 'through the suction opening 25 and the pivoting of the feeder 24 into its upper position (Fig. 1). If the query 49 of the lower thread reveals that this is not present in the electronic thread cleaner at the point in time that was transmitted through the signal line 24 'to the central control unit 42, this controls the drive for the shaft common to the cam arrangement to return, which when the initial position is reached 46 is canceled again. This control can be carried out in a very simple way by using a motor for the drive which can be operated in both directions. Such motors can be controlled, for example, so that the switching of the connections means 1/0 forward run, 0/1 reverse run, 0/0 standstill and 1/1 brakes. These simple circuits can be easily implemented by the central control unit 42 or the winding station computer. On the bearing the cam disc arrangement A shaft can be arranged, for example, a magnet wheel, which is monitored by Hall sensors, as a result of which the position of the magnet wheel and thus the cam disk arrangement is constantly known. In this way, the polling times for the presence of the thread ends can be precisely controlled. The rotary motion can be transmitted from the drive motor to the shaft carrying the cam disk arrangement via a worm drive, which is also not shown here. This also ensures that after stopping the drive, the cam arrangement only leaves this position when the drive is actuated again.

After returning (arrow 48 in FIG. 4) to the starting position 46, arrow 47 is another attempt to detect the lower thread. If the query in position 49 was successful, i.e. if a bobbin thread was recognized, the cam disk package continues to be driven in the forward direction, with the upper thread detection (arrow 55) immediately starting. This phase ends when the upper thread is inserted in the electronic thread cleaner 27 (FIG. 2) and the upper thread is queried in position 56. If there was an upper thread in the thread cleaner, the cam disc package is driven further forward. If no upper thread could be inserted into the thread cleaner, the cam disc arrangement (arrow 57) returns to an initial position 58 for the start of a second upper thread detection. This position 58 is at a certain angle from the starting position of arrow 55. This results from the fact that a return movement of the suction nozzle 34 into the vicinity of the zero position is not necessary since, in contrast to the feeder 24, the thread detection takes place in the upper position of the suction nozzle. This position 58 can be shifted even further to 58 'by shortening the arrow 57 to 57' in the direction of the upper thread request position 56, since during the return of the cam disk package, the suction nozzle 34 is adjacent to the surface of the package 38 remains arranged and also opens the valve for the vacuum supply of the suction nozzle 34 when returning. As a result, the suction time is doubled by the return phase and the subsequent forward phase of the cam arrangement. It is therefore only necessary to return approximately to the middle of the opening phase of the suction air valve for the suction nozzle 34.

Since the return of the reversing thread roller 37 is controlled by the winding station computer or the central control unit 42 independently of the cam disk arrangement, there is also the possibility of reducing the return speed when the upper thread search is repeated. Likewise, a short pause of the cam arrangement in position 58 can also be easily controlled on the winding station computer, which also extends the thread search time.

The arrow 50 in Fig. 4 shows the phase of the operation of the bobbin changing circuit, which is completed in the position 50 'and there passes into the phase of arrow bobbin detection identified by arrow 51 after the bobbin change. As can be seen from this, when a common cam disk arrangement is used, a second stroke of the feeder 24 is in principle necessary in order to be able to feed the thread after changing the bobbin without changing the drive direction. The immediate insertion of the lower thread into the electronic thread cleaner 27 takes place only after the upper thread has been inserted. Therefore, the second query 52 of the lower thread is after the query 56 of the upper thread. This need arises in particular from the fact that the feeder can only dip into the swivel area 36 of the suction nozzle 34 when it has passed the intersection with the swivel path 33 of the feeder. This results from the width of the suction opening of the suction nozzle 34, which must correspond at least to the width of the cheese. For this reason it is not disadvantageous if the feeder 24 must execute the second stroke mentioned.

If a lower thread is detected in position 52, a return to position 54 is necessary. Here, too, the symmetrical sequence of the cop change is used, so that a return to the middle of the cop change phase is sufficient to be able to carry out the complete cop change process.

After requesting the presentation of the two thread ends, the preparation for the splicing and then the splicing itself is carried out (arrow 59). The arrow 60 represents the release of the thread and the start of the reversing thread roller 37.

The sequence shown in FIG. 4 has the disadvantage that if the thread start is not grasped after the cop change, the cam arrangement must be retracted so far that a new upper thread search follows, even if the upper thread was found the first time. Furthermore, the electronic thread cleaner 27 must be designed so that it can distinguish between the static thread signal of a thread and that of two threads. This necessity results from the fact that after the upper thread query 56 the upper thread remains in the electronic thread cleaner 27 and the lower thread is added. The lower thread query 52 is therefore at the same time a query whether two threads are present in the thread cleaner at this point in time.

In order to prevent damage to the surface of the bobbin 38 in the case of sensitive yarns, if the upper thread detection is used again after the repetition of the bobbin change, which is rare in any case anyway, the reversing rotation of the reversing thread roller 37 can be prevented by the winding station computer. Even in this exceptional case, the advantage of Protection of the package side thread can be used according to the invention.

5 shows a variant which differs from the previously described variant in particular in that the phase of the cop change is brought forward. The procedure without changing the cops corresponds to that according to FIG. 4. The time at which the coping process is initiated is in any case without influence on this normal thread connecting process, since a coupling with the cam disk arrangement responsible for the cop changing has not yet taken place.

By advancing the change, here 62 according to FIG. 5, the end 63 of the change is so early that the lower thread detection 64 terminates with the lower thread query 65 at a time before the suction of the surface of the package 38 begins as part of the upper thread detection. In addition, the bobbin thread is checked after the bobbin change before the upper thread is inserted in the electronic thread cleaner 27. This also makes it possible to use an electronic thread cleaner which, apart from the dynamic thread signal, can only distinguish between the static thread signal and the absence of a thread , because only one thread is presented to him for control.

If the need for a cop change is recognized in the lower thread query 49 according to FIG. 5, the cam plate arrangement can be moved back to the starting position 46. But it is also possible to drive back only to the starting point 62 'for the cop change.

If, after changing the bobbin, the lower thread check at position 65 shows that no lower thread could be placed, the return 66 to position 67 is carried out. When you pass position 63, the change process begins. that is, at this point there must already be a coupling, for example by means of a magnet-operated latch, to the cam disk arrangement for the cop changing device. This results in a complete cop changing process, the first phase of which passes from position 63 to position 67, while the second phase runs from position 67 to position 63 during the subsequent forward run. Subsequently, the lower thread detection 64 takes place again.

In the variant shown in Fig. 6, the sensor 45 is present in the feeder 24, whereby the lower thread detection phase 47 'is greatly shortened until the control of the detection of the lower thread 49'. As a result, only a very short return 48 'to the starting position 46 is required. In this way, considerable time can be saved if multiple attempts to register the lower thread are necessary.

The process of changing the cops corresponds to the illustration in FIG. 5.

If a sensor 70 for thread control is also present in the suction nozzle 34, which is connected to the central control unit 42 via a signal line 70 ', the upper thread control 56' can also be carried out much sooner than the upper thread has been inserted into the electronic cleaner 27 . If the upper thread detection is repeated, then only a shortened return 57˝ is necessary, which is followed by a new detection 55 '.

As the description of the different time sequences shows, the grading of the individual steps can be controlled in very different ways with the aim of avoiding both complete repetitions and steps which cannot lead to success because the previous one The prerequisite for success was incorrectly carried out. This can be particularly important when processing delicate yarns, such as core yarns. In known devices, the beginning of the thread is searched for several times on the package, although there was no lower thread, that is to say the thread connection process could not lead to success. The search for threads of the upper thread is therefore limited in the present invention only to the cases in which the lower thread has already been determined. Multiple needle thread searches are only required if the first attempt to search the needle thread fails. In addition, the repetition of unsuccessful thread-connecting steps, including changing the bobbin, reduces the total time until the winding unit is put back into operation. In this case, the phase of braking the reversing thread roller with the cross-wound bobbin falls in the time of the return 48 for the repetition of the lower thread detection. Since the cam arrangement for thread connection is started immediately after a thread break has been detected by the electronic thread cleaner (absence of the dynamic thread signal), the bobbin and reversing thread roller are normally not at a standstill at position 49 (lower thread query) at high winding speeds. Accordingly, in any case, that is to say even with immediate thread detection, the cam arrangement in this position must be kept out of operation until the bobbin in the reversing thread roller has come to a standstill. Only then can the upper thread detection be used, in which, after the suction nozzle 34 has been swiveled up, the cross-wound bobbin 38 should already be driven in reverse. During this time, for example, the bobbin thread search can be repeated.

By detecting the winding condition of the cop 4 in the unwinding position, it is also avoided that an unnecessary repeat circuit is started when the sleeve 5 is empty becomes. When changing the bobbin, as a result of which the lower thread could not be detected, the entire changing process had to be repeated in previously known devices. The present invention even makes it possible to repeat the bobbin change within the first thread connection cycle.

Although the exemplary embodiments are in principle coordinated to carry out repetitive switching of the thread search of the filament-side or filament-side thread, the initiation of the bobbin change is also possible according to the invention, as set out in claim 1, even if the filament-side thread is missing for the first time. Already with this circuit it is achieved that an unnecessary switching delay is avoided and even if there is no thread on the take-up spool there is no search for the take-up thread on the take-up spool. Accordingly, the additional stress on the package-side thread on the surface of the package can already be prevented in this way.

Claims (17)

1. Apparatus for automatically performing the thread connecting having a fixed sequence of steps and changing the cops at a winding point of a winding machine, with a feeder for the thread of the take-up spool and a suction nozzle for the thread of the take-up spool, both of which can be pivoted to take up the respective thread and the detected one To be able to feed the thread connecting device,
characterized by
that a thread cleaner (27) is arranged in the thread travel path, which detects the presence, the movement and the dimensions of the thread (35), that the pivoting paths of the feeder (24) for the thread of the payout spool (4) and the suction nozzle (34) for overlap the thread of the package (38) each with the thread cleaner, that a device is present which determines the position of the feeder, and that a logic circuit is provided for linking the signal about the presence of the thread of the winding spool in the thread cleaner with the position signal of the feeder is and that a control circuit is present which, in the absence of the thread signal of the thread of the pay-off spool after completion of the feed movement of the feeder, brings about the start-up of the cop changing device (6, 13, 17, 19), the sequence of steps after the cop changing a new feeder movement for thread detection and Includes feed to the thread connecting device. 2. Apparatus according to claim 1, characterized in that a control is provided by which the feeder for the thread of the winding spool and the suction nozzle for the thread of the package are movable with a time delay so that the active thread search of the package side thread not before checking the Submission of the thread of the winding spool is used and that a control circuit is present which, in the absence of the thread signal of the thread of the winding spool after the feed movement of the feeder has been completed and before the cop changer (6, 13, 17, 19) is started, stops and controls a drive of the thread connecting device that this moves the feeder back at least to the starting position for thread pickup and switches back to the normal drive direction, and that a counter (Z1) is provided which counts the thread pickup attempts and only starts up the cop changing device after a predetermined number of failed attempts. 3. Apparatus according to claim 1 or 2, characterized in that a blowing device (14, 15, 16) is arranged in the region of the payout spool (4) with which an air flow from the payout spool in the direction of the thread take-up position (25) of the feeder (24th ) can be generated. 4. Device according to one of claims 1 to 3, characterized in that the start-up of the blowing device by the thread cleaner (27) after a thread break or a cop change is releasable and a circuit is present, the blowing device at the latest when the movement cycle of ' Feeder is disabled. 5. Apparatus according to claim 3 or 4, characterized in that the circuit for actuating the blowing device is coupled to the control circuit for repeating the feed movement of the feeder in such a way that the blowing device is actuated again when the feeder arrives in its starting position for the thread pickup becomes. 6. The device according to claim 5, characterized in that the circuit for the actuation of the blowing device (14, 15, 16) is designed such that it keeps the blowing device in operation for a longer period of time when the thread pick-up attempt is repeated than in the first thread pick-up attempt. 7. Device according to one of claims 1 to 6, characterized in that the winding unit is equipped with means (42, 68) which recognize a remaining amount of yarn on the payout spool (4) and are connected to a circuit which repeats a Thread pick-up attempt blocked by the payout spool if there is little or no thread residue on the spool sleeve of the payout spool. 8. The device according to claim 7, characterized in that the means for detecting the amount of remaining yarn still present on the payout spool are formed by a sensor (68) arranged next to the unwinding point. 9. The device according to claim 7, characterized in that the means for detecting the amount of remaining yarn still present on the payout spool are formed by the winding station computer (42), which registers the amount of yarn rewound after a cop change over the revolutions of the bobbin drive roller. 10. Device according to one of claims 1 to 9, characterized in that a sensor (69) is present in a waiting position of a payout spool adjacent to the unwinding position, which detects the presence of a payout spool in this position and is connected to a circuit which changes a cop blocked if no spool has been detected and the drive returns to its zero position. 11. The device according to any one of claims 1 to 10, characterized in that a circuit is present, the presence of this thread (35) in the thread cleaner (27) inquires after the cop change and the reinserting of the winding spool thread in the thread connecting device and the thread cleaner if this thread is not present, the drive of the thread connecting device stops and controls it so that it travels back at least as far into the bobbin exchange circuit that a renewed complete bobbin exchange can be carried out with the subsequent reversal of the direction of movement. 12. The device according to one of claims 1 to 11, characterized in that a device (44) is present which determines the position of the suction nozzle (34) that a logic circuit for linking the signal about the presence of the thread (35˝) the winding spool (38) in the thread cleaner (27) with the position signal of the suction nozzle is provided that a further control circuit is present which, in the absence of the thread signal of the thread of the winding spool, stops the drive of the device after completion of the feed movement of the suction nozzle, switches to return and controls so that this moves the suction nozzle back by a predeterminable amount and switches back to the normal drive direction, and that a counter (Z2) is present, which counts the thread pick-up attempts for the thread of the package and, after a predeterminable number of failed attempts, switches off the drive and signals the failed attempts. 13. The apparatus according to claim 12, characterized in that the circuit for the thread search of the package side thread is designed so that it extends the search time when repeating the thread search. 14. Device according to one of claims 1 to 10, characterized in that a common cam arrangement for the thread connecting organs of a winding unit is present, which has a drive which can be switched to return for repetition of individual thread connecting steps. 15. The device according to one of claims 12 to 14, characterized in that the circuit for the thread search of the package-side thread is designed so that it stops the drive for the common cam arrangement during thread search to extend the search time when the thread search is repeated. 16. The apparatus according to claim 15, characterized in that a circuit is present, through which the drive of the drive roller (37) for the package (38) is operated with repeated thread search at a reduced return speed. 17. Device for automatically performing the thread connecting having a fixed sequence of steps and changing the cops at a winding point of a winding machine with a feeder for the thread of the take-off spool and a suction nozzle for the thread of the take-up spool, both of them are pivotable in order to be able to pick up the respective thread and to be able to feed the detected thread to the thread connecting device, characterized in that a sensor (45) is arranged on the feeder (24) in such a way that it can determine the presence of the detected thread (35 ′), that a control circuit is present which, in the absence of the thread signal from the sensor, interrupts the sequence of steps of the thread connection process after the predetermined detection period has elapsed, drives the drive for the device back to the starting position for thread pick-up and switches back to the normal drive direction, and that a counter (Z1 ) is provided, which counts the thread pick-up attempts and, after a predeterminable number of failed attempts, initiates the start-up of the cop changing device.

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