EP0916612B1 - Apparatus and method for guiding and cutting a continuously supplied thread - Google Patents

Description

The invention relates to a device for guiding and cutting a continuously tapering thread when changing bobbins in one Winding device according to the preamble of claim 1 and a Process for guiding and cutting a continuously running thread according to the preamble of claim 11.

The device and the method are known from EP 0 311 827. For example, a crimped thread becomes continuous in textile machines wound into a coil. After the bobbin has finished winding, a Bobbin change. For this it is necessary that the thread is cut first is so that the full bobbin with loose thread end against a new one Empty sleeve can be replaced. The thread end of the continuously incoming thread is changed during the change by means of a pneumatic Suction device added and removed. After the bobbin change the thread is caught and opened by means of a catching device the new sleeve wrapped.

In the device known from EP 0 311 827 and in the known method, the thread is by means of a movable thread guide after completion of the bobbin outside of the bobbin area to one side suction device arranged next to the winding area. After the The bobbin has been changed and the new tube is ready to be caught the thread guide is pivoted back into the winding area. For handover or the thread is caught by means of a transfer device between the Suction device and the thread guide deflected and the catching device offered for catching.

The known device and the known method have the disadvantage that that at the end of the winding trip the loose thread end on the finished bobbin is undefined, which is particularly the case with further processing Finding the loose thread end difficult.

Furthermore, the deflection of the thread leads through the transfer device to catch the thread to significant wraps that are in proportion. to the winding tension to greater fluctuations in tensile force in the thread to lead. Such fluctuations in tractive force can occur with upstream Conveyor elements lead to winder formation.

FR 2 247 906 discloses a device in which a thread running in through a thread Thread running direction behind the sleeve arranged movable thread guide such is deflected that the thread is arranged in the thread running direction in front of the sleeve non-moving thread guide arrives, and one of the movable thread guide associated cutting device is cut.

US 5,005,776 discloses a device in which a movable in front of the sleeve arranged thread guide and the suction device arranged laterally next to the sleeve are. In this case, the thread transfer to the side of the sleeve is arranged Suction device for the thread picked up by the bobbin over the end of the bobbin led out, whereby the running thread falls off the bobbin.

It is an object of the invention, an apparatus and a method of to create the type mentioned in such a way that when changing the bobbin, Catch the thread and when winding the thread one if possible gentle thread guidance is guaranteed.

Another object of the invention is to cut after the thread ensure that the loose thread end on the binding bead of the full bobbin is applied.

This object is achieved by a device with the Features according to claim 1 and by a method with the Features solved according to claim 11.

The invention is characterized in that the thread guide and Suction device are arranged within the winding area. The The winding area is the area on the tube that changes from that Thread is covered. This allows the thread to be relatively low Cut and then caught again. In order to do not occur during the changeover phase Thread tension fluctuations on. The suction device is here preferably arranged stationary. With one essentially parallel to the coil movably designed suction device, there is the possibility of the loose Thread end with the binding bead at any position within the To place the winding area. Furthermore, the additional Mobility of the suction device a high flexibility in the design given the safety gear.

In a particularly advantageous development of the device according to Claim 2 are the thread guide and the suction device in one Transfer plane arranged so that the loose thread end on the full spool can be safely placed on the binding reel. Furthermore, by simple pivoting movement of the thread transfer device into the Cutting device of the suction device are introduced. Here is only a deflection in the transfer level is required. The gripper arm of the Transfer device detects the thread in the thread path between the already lifted bobbin and the thread guide. This training has further the advantage that when lifting the spool from the drive roller the thread is safely guided in the thread guide by the transfer device remains. The transfer level is preferably the normal level Coil formed and contains the binding coil of the coil.

The execution of the device according to claim 3 ensures that the Thread from the pneumatic already before entering the cutting device Suction port is detected. The thread end of the incoming thread is thus safely recorded in the cutting device after severing and dissipated. For this purpose, the cutting device preferably has one Knife blade on the gripper arm of the transfer device such interacts that the thread cleanly and quickly through the knife blade is cut.

To securely feed the running thread into the suction opening of the suction connection lead, this is advantageously designed slotted according to claim 4. The particularly advantageous development of the device according to claim 5 allows the thread to move without further aids simply by movement the thread guide is caught in the catching device. For this, the Thread deflected parallel to the tube only in the longitudinal direction. By a additional rectified movement of the suction device can also minimize the deflection of the thread.

In the winding device according to the invention, in which the sleeve is stretched between two clamping plates arranged on a coil holder and the catching device is formed on one of the clamping plates, can catch the thread in a simple way. To do this, thread the thread at an angle Run over the front edge of the tension plate, so that the thread in one in the front edge of the clamping plate inserted slot falls automatically.

In addition, the arrangement of the thread guide and the catching device is such advantageous that the thread and the tension plate have a rectified movement To run. So there is no waste and therefore no excessive Thread tension fluctuation.

In the previously described processes for changing bobbins, catching and for winding the thread is provided that the thread at the beginning of the Bobbin change by means of an auxiliary device on a traversing thread guide guided and then taken over by the thread guide. The Thread guide is preferably carried out with a drive that the Thread guide moved in the longitudinal direction parallel to the tube and the movement of the thread guide regardless of direction with variable speed performs. In this case, the drive could be a linear drive, for example be executed.

In a particularly advantageous development of the invention Thread guide designed as a traversing thread guide of a traversing device. For this purpose, the traversing thread guide can take the thread outside and inside the Guide the winding area in the longitudinal direction parallel to the core. This execution has the advantage that no additional control unit for controlling the Traversing device is required. All operations during winding, during the bobbin change and while catching are over a Control device of the traversing device controlled.

After the thread has been caught and wound on the core, the actual winding travel takes place, i.e. winding the spool. After this the bobbin is finished, the thread is used to initiate the bobbin change taken over by the suction device. This remains the thread leading traversing thread guides are on a transfer level. The The transfer device then leads the thread into the suction device. Now that the bobbin has been changed and the empty tube in it The bobbin holder is stretched between the clamping plates, starts to put on the Thread. First, the sleeve is placed on one necessary for the application Speed accelerated. As soon as the speed is reached, the drive of the The traversing thread guide is activated, and the traversing thread guide guides the thread in a catching position in which the thread is inclined over a catching plane of the Catcher runs, for example an end edge of the clamping plate. The Formation of the device according to the invention according to claim 9 particularly advantageous to directly after the thread without time delay Reaching the winding speed required for winding up using the Catch the catching device and wind it up on the core. For this, the Speed of the sleeve continuously recorded. As soon as a predetermined winding speed the drive of the thread guide is activated. The thread guide then lists the for catching the thread and for winding the thread movements corresponding to the sleeve. The spool speed corresponds to Speed of rotation of the sleeve, which produces a peripheral speed on the sleeve, which is essentially equal to the thread speed.

However, this training also offers the possibility that the Sequence of movements of the thread guide also in the acceleration phase or Delay phase of the sleeve is placed. This is particularly advantageous in the cases in which the thread in the catching device is initially on a larger diameter than the sleeve diameter is caught. Therefore to maintain a substantially constant winding speed of the Fadens the catching device rotating with the speed of the sleeve with a driven at a lower speed than the spool speed during catching his.

A particularly advantageous embodiment of the device according to the invention according to claim 10 has the advantage that the thread without essential Delay immediately when the thread guide reaches a catch position of the catching device is caught. Because the thread continues until caught is guided in the suction device, this variant leads to a Reduction of the amount of waste of the thread.

Further advantageous developments of the invention are in the Subclaims defined.

The device according to the invention and the method are based on some Embodiments below with reference to the accompanying Drawings described in more detail.

Fig. 1

schematisch ein erstes Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung beim Spu lenwechsel;

Fig. 2

schematisch die Vorrichtung aus Fig. 1 beim Fangen des Fadens;

Fig. 3

schematisch ein weiteres Ausführungsbeispiel der erfindungsgemäßen Vorrichtung beim Spulenwechsel;

Fig. 4

schematisch die Vorrichtung aus Fig. 3 beim Fangen des Fadens.

They represent:

Fig. 1

schematically a first embodiment of a device according to the invention len spu change;

Fig. 2

schematically the device of Figure 1 when catching the thread.

Fig. 3

schematically another embodiment of the device according to the invention when changing the bobbin;

Fig. 4

schematically the device of Fig. 3 when catching the thread.

In Fig. 1 and Fig. 2 is a first embodiment device according to the invention shown within a winding device, as it can be used for example in a texturing machine. The The following description therefore applies to FIGS. 1 and 2, insofar as nothing other is said.

The winding device has a pivotable bobbin holder 26 which is mounted on a pivot axis 40. The pivot axis 40 is at one Machine frame 41 attached. At the free ends of the fork-shaped Coil holder 26 are two opposing clamping plates 27 and 28 rotatably mounted. Between the clamping plates 27 and 28 is a sleeve 13 for Picking up a coil tensioned. For this purpose, the clamping plates 27 and 28 each have a conical centering shoulder, which is partially in the sleeve end protrudes. The sleeve 13 is thus between the clamping plates 27 and 28 centered. A drive roller 29 bears against the surface of the sleeve 13. The Driving roller 29 is fastened on a drive shaft 31. The drive shaft 31 is coupled to the roller motor 30 at one end. The roller motor 30 drives the drive roller 29 at a substantially constant speed. Via friction, the sleeve 13 now becomes a by means of the drive roller 29 Spindle speed driven so that the thread 1 on the sleeve 13 to a Coil is wound. For this purpose, is in front of the drive roller 29 in the thread path Traversing thread guide 6 arranged. The traversing thread guide is with one Coupling drive coupled, which the traversing thread guide 6 within the Drives the winding area oscillating. The traversing drive can, for example be formed by a reverse thread shaft or a belt drive.

Between the traversing thread guide 6 and the sleeve 13 is a movable Thread guide 18 arranged. The thread guide 18 is with a drive 19 coupled, which the thread guide 18 in a parallel plane to the sleeve 13 so back and forth that the thread guide 18 both within the Spooling area is positioned as well as outside of the winding area. The Drive 19 is connected to a control device 8. The control device 8 can be used as an option in conjunction with one on the coil holder 26 arranged sensor 32 may be connected. The sensor 32 is in the range of Clamping plates 27 arranged and senses the position of a catch groove 21 Catching device 14. The catching device 14 is on the clamping plate 27 educated. The sensor 32 can be designed as a pulse generator, for example be a signal per revolution depending on the catch groove 21st emits. These pulses are used in the control device 8 for evaluation Location of the catch groove and the speed of the sleeve 13 converted. The sleeve 13 is clamped in such a way between the clamping plates 27 and 28 that the Clamping plate 27 and 28 without slipping at the speed of the sleeve 13 circulate.

On the opposite side to the sleeve 13 for traversing is one Suction device 37 arranged. The suction device 37 is here from a cutting device 38 and a suction port 39. The Suction port 39 is here between the cutting device 38 and the Sleeve 13 arranged. The suction port 39 has a slot-shaped Suction opening 46, which is aligned with a knife 47 of the cutting device 38 is arranged.

In the situation shown in Fig. 1 is in the take-up device Reel change immediately before. To initiate the bobbin change, the Thread guide 18 via the drive 19 in the bobbin area in one Transfer level positioned. At the same time is about one, not closer here auxiliary device of the thread 1 from the traversing thread guide 1 guided and inserted into the thread guide 18. The auxiliary device can can be designed in a simple manner as a ramp parallel to Movement of the traversing thread guide 6 is introduced into the winding area. Thus, the thread 1 could be guided out of the traversing thread guide 6 automatically become. The ramp would advantageously be coupled to the thread guide 18, see above that the thread sliding on the ramp automatically into the guide groove of the Thread guide 18 occurs.

While the thread guide 18 is positioned in the transfer plane, a The binding coil 23 is wound in a bead-like manner on the coil 24. To the Carrying out bobbin changes is now carried out in the winding device Coil holder 26 pivoted such that the coil 24 is different from the Surface of the drive roller 29 releases. The coil 24 is therefore no longer actively driven. The thread 1 is further wound as a binding bead 23. Now a transfer device 42 is arranged laterally to the coil area activated. The transfer device 42 has a gripping arm 43, which with a free end penetrates the transfer level. The gripper arm 43 is on a pivot axis 25 is rotatably supported and is not one here shown drive moves parallel to the transfer plane. The gripper arm 43 is dimensioned such that the free end of the gripper arm 43 the thread grips between the thread guide 18 and the bobbin 24 and the thread 1 in the transfer level leads to the suction device 37. The suction device 37 lies within the free end of the gripping arm 43 described trajectory. This ensures that the thread 1 in the Cutting device 38 is immersed and cut by the knife 47. Shortly before or at the same time, the thread 1 reaches the slit-shaped one Suction opening 46 of the suction connection 39. The thread end of the incoming Thread is thus suctioned off immediately after cutting. That loose Thread end of the bobbin is through the outgoing bobbin 24 on the Tying winder 23 stored. The transfer device 42 is after the Cutting the thread 1 moved back to its starting position.

In the situation shown in FIG. 2, the spool has already been changed, and the continuously fed thread is from the suction device 37 and the thread guide 18 out. Because of the clarity, Fig. 2 dispenses with the representation of the transfer device.

The thread 1 is fed through the suction opening 46 of the suction connection 39 continuously removed by means of a suction stream. The coil 24 was through replaced a new empty tube, which is driven by the drive roller 29. In order to apply the thread to the empty tube 13 for winding, the Thread 1 guided by the suction device 37 through the thread guide 18. The thread guide 18 is driven into a catch position by the drive 19 out of the winding area. This catch position of the thread guide 18th is selected such that the thread 1 obliquely across the sleeve Front edge of the clamping plate 27 runs. Previously, the sleeve 13 by the on Circumferential drive roller 30 to a predetermined by the drive roller Spindle speed driven.

When a sensor 32 is used, it generates the each time it passes Catch groove 21 a pulse, which is given to the control device 8. The control device 8 has an evaluation device which consists of the the momentary speed of the Clamping plate 27 and thus the sleeve 13 determined. At the same time everyone gives Impulse the position of the catch groove 21. After the sleeve 13 the winding speed reached and the catch groove 21 a position required for safe catching has, the drive 19 of the control device 8 is activated to the Thread guide 18 to move to its catch position. Thread 1 is now caught by the catching device 14 in the clamping plate 27.

After the thread 1 is caught by the catching device 14, the Thread through a between the thread suction device 37 and the Clamping device 27 arranged cutting device 45 cut. After this The thread guide 18 is caught by the drive 19 from the catching position deflected to deposit a thread reserve winding on the sleeve. For this the thread guide 18 is moved towards the center of the tube. after the Thread reserve winding is placed, the thread 1 is the traversing thread guide 6 passed. This could also be a ramp Auxiliary device can be used. The winding up now begins with a new spool trip.

3 and 4 is a further embodiment of an inventive Device shown as in a winding in a Texturing machine can be used. In this embodiment, the Thread 1 for changing bobbins, for catching and for winding through the Traversing thread guide 6 out. Because the structure of the take-up reel itself essentially only by the traversing device to that in FIG. 1 Different winding device shown, the components have the same Function received identical reference numerals. So far at this point also refer to the description of FIGS. 1 and 2.

The traversing device 22 is constructed as a so-called belt traverse. Here, a traversing thread guide 6 is attached to an endless belt 33.

The belt 33 is parallel to between two pulleys 34.1 and 34.2 Sleeve 13 out. In the belt plane there is a part wrapped around the belt Drive roller 35 arranged parallel to the deflection rollers 34.1 and 34.2. The Drive roller 35 is on a drive shaft 44 of an electric motor 36 attached. The electric motor 36 drives the drive roller 35 in an oscillating manner, so that the traversing thread guide 6 in the area between the deflection rollers 34.1 and 34.2 back and forth. The electric motor is about that Control device 8 controllable. The control device 8 is connected with the sensor 32 arranged on the coil holder 26, which detects the catch groove 21 of the catching device 14 sensed.

In Figures 3 and 4, the winding device is different Operating situations shown. In Fig. 3 the winder is at the end a winding trip shown. After the coil 24 is wound to the end the traversing thread guide 6 is positioned in a transfer plane. In this The traversing thread guide 6 remains on the transfer plane now produces a binding wrap 23. At the same time, the bobbin holder 26 becomes the coil 24 pivoted from the operating position. Now one kicks Transfer device 42 in action by a gripper arm 43 with its free End in the thread course between the full spool 24 and the Traversing thread guide 21 engages. The gripper arm 43 becomes one Rest position pivoted into a transfer position. Here he takes hold of the Thread 1 and leads the thread in the transfer position to the suction device 37. The thread is then cut in the cutting device 38 and by the suction port 39 taken over. The loose thread end is on the Coil placed in the area of the binding reel. Now the coil 24 can an empty tube can be replaced. The advantage here is that the sensor is attached to the coil holder and thus the standstill of the coil signals that there is no more pulse. The sensor signal can thus Activation of a changing device can be used. After the coil 24 has been replaced by a sleeve, the process of laying on begins.

4 shows the start of the application process. The continuously fed thread is from the suction device 37 and the Traversing thread guide 6 out. For this purpose, the thread end is in a suction opening of the suction port 39 sucked. The traversing thread guide 6 is in Direction of the clamping plate 27 into a catch position outside the winding area guided. The sleeve 13 is driven by the peripheral roller 29 driven to a spool speed predetermined by the drive roller. The Sensor 32 generates a pulse each time it passes through the catch groove 21 the control device 8 is abandoned. The control device 8 has one Evaluation device, which from the pulses occurring per unit of time the current speed of the centering plate and thus the sleeve is determined. At the same time, each pulse indicates the position of the catch groove 21. after the Sleeve 13 reaches the spool speed and the catch groove one for safe Catching required position is controlled by the control device 8 the electric motor 6 controlled so that the electric motor Traversing thread guide 6 brings in the catch position. Thread 1 now crosses the catch level of the catching device 14, so that it from the catch groove 21st is caught. The thread 1 is caught with the catch groove 21 and with a knife integrated in the catching device or the clamping plate 27 cut. Such a clamping plate is for example from EP 0 403 949 known. In this respect, reference is made to the publication mentioned.

After catching, the traversing thread guide 6 becomes from the catching position Led winding area. Here, the thread 1 on the sleeve 13 outside of the winding area wound into a thread reserve winding. The formation of the Thread reserve winding could be done by one in one position persistent traversing thread guide 6. Then the Thread reserve winding on a number of parallel windings. The Traversing thread guide 6 can, however, also be operated with one by the electric motor 36 certain speed to the winding area so that adjacent turns generated in the thread reserve winding become. As soon as the thread guide reaches the winding area, the begins Winding cycle. The traversing thread guide 6 is then within the winding area driven oscillating by the traversing device 22. The growing Coil diameter of the coil 24 is by a pivoting movement of the Coil holder 26 allows. For this purpose, the coil holder 26 has force transmitters, on the one hand a contact pressure required to drive the coil generate between the coil 24 and the drive roller 29 and on the other hand Allow pivotal movement of the bobbin holder 26.

LIST OF REFERENCE NUMBERS

1

thread

6

Traversing thread guide

8th

control device

13

shell

14

catcher

18

thread guides

19

drive

21

catching groove

22

Traversing device

23

Abbindewickel

24

Kitchen sink

25

swivel axis

26

spool holder

27

clamping plate

28

clamping plate

29

drive roll

30

roller motor

31

drive shaft

32

sensor

33

belt

34

idler pulley

35

capstan

36

electric motor

37

suction

38

cutter

39

suction connection

40

swivel axis

41

machine frame

42

Transfer device

43

claw arm

44

drive shaft

45

cutter

46

suction opening

47

knife

Claims (14)

1. Device for guiding and cutting a continuously supplied thread (1) during a bobbin change in a winding mechanism, in which the thread (1) is wound into a bobbin (24) on a tube (13) driven by a drive.roller (29), with a movable thread guide (18) which can be moved by a drive (19) substantially parallel to the tube (13) with a suction mechanism (37) which is arranged downstream from the thread guide (18) in the thread course and which comprises a pneumatic suction connection (39) and a cutting mechanism (38), and with a transfer mechanism (42) cooperating with the suction mechanism (37), the thread (1) being guided by the thread guide (18) when the bobbin is changed, when caught in a catching mechanism (14) and during winding onto a new tube (13) and the supplied thread being received by the suction mechanism (37) after cutting until the thread is caught, characterised in that the thread guide (18) is arranged in the thread course upstream from the driven tube (13) and the suction mechanism (37) is arranged downstream from the driven tube (13).
2. Device according to claim 1, characterised in that for cutting the thread guide (18) and the suction mechanism (37) are arranged in a transfer plane, in that the transfer mechanism (42) is a gripper arm (43) which can be moved parallel to the transfer plane and which can be swivelled with one free end into the thread course between the thread guide (18) and the bobbin (24) lifted off by the drive roller (29), and in that the suction mechanism (37) is arranged inside the movement radius of the free end of the gripper arm (43).
3. Device according to claim 2, characterised in that the suction connection (39) and the cutting mechanism (38) of the suction device (37) are arranged one behind the other in the transfer plane.
4. Device according to claim 3, characterised in that the suction connection (39) has a slotted suction aperture (46) in the running direction of the thread, the suction aperture (46) being arranged flush with a knife (47) of the cutting mechanism (38).
5. Device according to any one of claims 1 to 4, characterised in that for catching, the thread guide (18) and the suction mechanism (37) are arranged with respect to one another in such a way that the catching mechanism (14) is in the thread course between the thread guide (18) and the suction mechanism (37).
6. Device according to claim 5, characterised in that the tube (13) is fixed between two fixing plates (27, 28) arranged on a bobbin holder (26) and in that the catching mechanism (14) is formed on one of the fixing plates (27).
7. Device according to any one of claims 1 to 6, characterised in that the thread guide is designed as a reciprocating thread guide (6) of a reciprocating mechanism (22), which reciprocating thread guide (6) guides the thread (1) outside and inside the spooling region in the longitudinal direction parallel to the tube (13) and in that the reciprocating thread guide (6) can be driven regardless of direction by a drive (36) with changeable speed.
8. Device according to claim 7, characterised in that the reciprocating thread guide (6) can be moved into a transfer position inside the spooling region after the thread (1) has been wound into a bobbin (full bobbin), in that the tube (13) with the full bobbin can be swivelled out of the operating position by a swivellable bobbin holder (26) and in that the transfer mechanism (42) can be moved in such a way that the thread (1) can be detected between the full bobbin (24) and the reciprocating thread guide (6) and can be guided to the suction mechanism for cutting and transfer.
9. Device according to any one of the preceding claims, characterised in that the drive (19, 36) of the thread guide (18, 6) can be controlled by a control mechanism (8) which is connected to a sensor (32) detecting the speed of the tube (13).
10. Device according to claim 9, characterised in that a sensor (32) is arranged in the region of the catching mechanism (14) and detects the position of a catching groove (21) in the catching mechanism (14) and is connected to the control device (8).
11. Method for guiding and cutting a continuously supplied thread (1) during a bobbin change in a winding mechanism which winds the thread (1) into a bobbin (24) on a tube (13) driven by a drive roller (29), in which the thread (1) is guided substantially parallel to the bobbin axis by a movable thread guide (18) for changing the bobbin, catching in a catching mechanism (14) and for winding onto a new tube, in which the thread (1) is guided to a suction mechanism (37) by means of a transfer mechanism (42) for cutting and in which the supplied thread (1) is received by the suction mechanism (37) after cutting until the thread (1) is caught, characterised in that once the thread (1) has been wound into a bobbin (full bobbin) (24) the thread guide (18) is moved into a transfer plane inside the spooling region to form a tie winding, in that the tube (13) with the full bobbin is moved away from the drive roller (29), in that the thread (1) is detected between the thread guide (18) and the full bobbin (24) by the transfer mechanism (42) which can be moved parallel to the transfer plane and is guided to the suction mechanism (37) located in the transfer plane for cutting and transfer.
12. Method according to claim 11, characterised in that for catching the thread, the thread guide (18) with the thread (1) is guided in a catching position outside the spooling region, so the thread (1) crosses a catching plane of the catching mechanism (14) between the suction mechanism (37) inside the spooling region and the thread guide (18) outside the spooling region.
13. Method according to claim 11 or 12, characterised in that the movement of the thread guide (18) for catching and winding on is controlled as a function of the speed of the tube (13) in such a way that the thread (1) is caught and wound on upon reaching the spooling speed.
14. Method according to claim 13, characterised in that the position of a catching groove (21) in the catching mechanism (14) is detected by means of a sensor (32) producing a signal to release the movement of the thread guide (18).

Images