EP0916612A2 - Apparatus and method for guiding and cutting a continuously supplied thread - Google Patents

Abstract

The bobbin winder assembly, which is fed with a continuous yarn (1) for winding, has a yarn guide (18) which is in front of the rotating bobbin sleeve (13) in the direction of yarn travel, and the suction yarn catch unit (37) is after the sleeve. To sever the yarn, on a bobbin change, the yarn guide and suction unit are at a transfer plane. The transfer unit (42) has a grip arm (43), which moves parallel to the transfer plane, with its free end in the yarn path between the yarn guide and the full bobbin (24) detached from the friction drive roller (29). The suction unit is within the movement radius of the free end of the grip arm (43). The suction connection (39) and the cutter (38) are behind each other, on the transfer plane.

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. In textile machines, for example, a crimped thread becomes continuous wound into a coil. After the bobbin has finished winding, a Reel 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.

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 bobbins, 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 present.

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 13.

The invention is characterized in that the thread guide and Suction device are arranged within the winding area. Of 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 no significant occur during the change 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 high flexibility in 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 The thread already comes from the pneumatic before entering the cutting device Suction port is detected. The thread end of the incoming thread is thus safely taken into the cutting device after severing and dissipated. For this purpose, the cutting device preferably has one Knife blade on such with the gripper arm of the transfer device 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 easily. 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. Of 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 executes. In this case, the drive could be a linear drive, for example be executed.

In a particularly advantageous development of the invention, the 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 Traversing thread guide 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 immediately after the thread without 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 them for catching the thread and winding the thread movements corresponding to the sleeve. The spool speed corresponds to the Speed of rotation of the sleeve, which generates 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 be.

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 thread waste.

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 Spulenwechsel;

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 when changing bobbins;

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 is now one 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. Of 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 sensed 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 delivers. 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 Positioned transfer level. At the same time is about one, not closer here explained 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 carried out in a simple manner as a ramp parallel to Movement of the traversing thread guide 6 is introduced into the winding area. The thread 1 could thus 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 Bonding 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 is 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 rotatably mounted and is not one here shown drive moves parallel to the transfer level. 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 through 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 Cutting the thread 1 moved back to its starting position.

In the situation shown in FIG. 2, the bobbin 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 flow. 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 performed outside the winding area. This catch position of the thread guide 18th is chosen 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 location 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 plate 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 another 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. Since 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 level 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 roll 23. At the same time, the coil holder 26 is also the coil 24 pivoted out of 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 guides 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 binding area. 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 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 in a catching position outside the winding area guided. The sleeve 13 is driven by the circumferential drive roller 29 driven to a spool speed predetermined by the drive roller. Of 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. Of the Traversing thread guide 6 can, however, also be provided 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 trip. 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.

REFERENCE SIGN LIST

1

thread

6

Traversing thread guide

8th

Control device

13

Sleeve

14

Safety gear

18th

Thread guide

19th

drive

21

Catch groove

22

Traversing device

23

Tying wrapping

24th

Kitchen sink

25th

Swivel axis

26

Spool holder

27

Clamping plate

28

Clamping plate

29

Drive roller

30th

Roller motor

31

drive shaft

32

sensor

33

belt

34

Pulley

35

Drive roller

36

Electric motor

37

Suction device

38

Cutting device

39

Suction connection

40

Swivel axis

41

Machine frame

42

Transfer device

43

Gripper arm

44

drive shaft

45

Cutting device

46

Suction opening

47

knife

Claims (14)

Device for guiding and cutting a continuously running thread (1) during a bobbin change in a winding device, in which the thread (1) is wound on a sleeve (13) driven by a drive roller (29) to form a bobbin (24), with a Movable thread guide (18), which can be moved essentially parallel to the sleeve (13) by a drive (19), with a suction device (37) which is arranged downstream of the thread guide (18) in the thread run and which has a pneumatic suction connection (39) and a cutting device ( 38), and with a transfer device (42) which interacts with the suction device (37), the thread (1) when changing the bobbin, when catching in a catching device (14) and when winding on a new sleeve (13) by the thread guide ( 18) and the incoming thread is picked up by the suction device (37) after cutting until the thread is caught,
characterized in that
the thread guide (18) in the thread run in front of the driven sleeve (13) and the suction device (37) are arranged behind the driven sleeve (13). Device according to claim 1,
characterized in that
for cutting the thread guide (18) and the suction device (37) are arranged in a transfer plane such that the transfer device (42) is a gripper arm (43) which can be moved parallel to the transfer plane and which has a free end in the thread path between the thread guide (18 ) and the coil (24) which is lifted off the drive roller (29), and that the suction device (37) is arranged within the radius of movement of the free end of the gripping arm (43). Device according to claim 2,
characterized in that
the suction connection (39) and the cutting device (38) of the suction device (37) are arranged one behind the other in the transfer plane. Device according to claim 3,
characterized in that
the suction connection (39) has a suction opening (46) slotted in the thread running direction, which is arranged in alignment with a knife (47) of the cutting device (38). Device according to one of claims 1 to 4,
characterized in that
for catching the thread guide (18) and the suction device (37) are arranged in relation to one another such that the catching device (14) lies in the thread path between the thread guide (18) and the suction device (37). Device according to claim 5,
characterized in that
the sleeve (13) is stretched between two clamping plates (27, 28) arranged on a coil holder (26) and that the catching device (14) is formed on one of the clamping plates (27). Device according to one of claims 1 to 6,
characterized in that
the thread guide is designed as a traversing thread guide (6) of a traversing device (22), which traversing thread guide (6) guides the thread (1) outside and inside the winding area in the longitudinal direction parallel to the sleeve (13) and that the traversing thread guide (6) is guided by a its speed-variable drive (36) can be driven in any direction. Device according to claim 7,
characterized in that
the traversing thread guide (6) after winding the thread (1) into a bobbin (full bobbin) can be moved into a transfer position within the bobbin area, that the sleeve (13) with the full bobbin can be pivoted out of the operating position by means of a pivotable bobbin holder (26) and that the transfer device (42) is movable in such a way that the thread (1) between the full bobbin (24) and the traversing thread guide (6) can be detected and can be guided to the suction device for cutting and transferring. Device according to one of the preceding claims,
characterized in that
the drive (19, 36) of the thread guide (18, 6) can be controlled by a control device (8), which control device (8) is connected to a sensor (32) that detects the speed of the sleeve (13). Device according to claim 9
characterized in that
a sensor (32) is arranged in the area of the catching device (14), which detects the position of a catching groove (21) in the catching device (14) and which is connected to the control device (8). Method for guiding and cutting a continuously running thread during a bobbin change in a winding device which winds the thread on a sleeve driven by a drive roller to a bobbin, in which the thread for bobbin changing, for catching in a catching device and for winding on a new sleeve is guided by a movable thread guide essentially parallel to the bobbin axis, in which the thread for cutting is guided to a suction device by means of a transfer device and in which the incoming thread is picked up by the suction device after cutting until the thread is caught,
characterized in that
after winding the thread into a bobbin (full bobbin) the thread guide is moved into a transfer plane within the winding area to form a binding that the sleeve with the full bobbin is moved away from the drive roller, that the thread between the thread guide and the full bobbin through the parallel to the transfer plane movable transfer device is detected and supplied for cutting and for taking over the suction device lying in the transfer plane. A method according to claim 11, characterized in that
for catching the thread, the thread guide is guided with the thread in a catching position outside the winding area, so that the thread between the suction device inside the winding area and the thread guide outside the winding area crosses a catching plane of the catching device. The method of claim 11 or 12,
characterized in that
the movement of the thread guide for catching and for winding is controlled depending on the speed of the sleeve so that the thread is caught and wound when the spool speed is reached. A method according to claim 13,
characterized in that
the position of a catch groove in the catch device is detected by a sensor which generates a signal for releasing the movement of the thread guide.

Images