WO2011017816A2 - Monitoring and control of the belt guide in a winding device - Google Patents

Abstract

The invention relates to a device for monitoring and controlling the belt course in a device for producing a lap roll (WW), wherein the lap (W) is wound onto a core (H) driven by a circulating, endless belt (R), wherein the endless belt is guided in a loop (S) around the core (H) over several pulleys (R1 - R6) and the core is retained between two winding disks (W1, W2) that protrude beyond the core in the radial direction. The aim of the invention is to propose a device, wherein the monitoring and regulation of the belt course of a commercially available flat belt transverse to the running direction of the flat belt are improved and simplified in relation to known solutions. Said aim is achieved in that a non-contact sensor (S1) is attached at least at a point of the belt course outside of the loop (S) in the area of one of the side edges (RS) of the belt (R), the non-contact sensor being suitable for continuously detecting the position of the scanned side edge (SR) of the belt (R), and the sensor (S1) is connected to a control unit (ST), by means of which at least one actuating device (11) for returning the belt to a predetermined tolerance range (T) can be controlled.

Description

 Monitoring and controlling the belt guide in a winding device

The invention relates to a device for monitoring and controlling the course of the belt in a device for producing a lap roll, wherein the cotton is wound on a driven by a rotating, endless belt core, wherein the endlessly formed belt in a loop around the core over a plurality of pulleys is guided and the core is held between two, the core in the radial direction superior winding discs. From DE-A1-195 39 365 a device is known, wherein a lap roll is formed using a driven and endlessly circulating belt. In this case, a cotton wool is fed between two deflection rollers of a belt loop. Within the belt loop is a rotatably mounted sleeve, which is driven by the movement of the belt via friction. The sleeve is clamped between two winding discs, which project beyond the sleeve in the radial direction. At the beginning of the winding process while the cotton web is fed into the region between the circumference of the sleeve and an inner surface of the belt loop. By the transport movement of the belt, the supplied cotton is on the sleeve

wound. In this case, the Wattebahn - seen in the radial direction of the sleeve - is wound in layers on the sleeve. With this device, a very compact winding can be formed at high winding speed. The two winding disks support the winding process, in particular to achieve a clean

Edge region of the produced roll. That means during the

Winding the edges of the wound cotton web are guided through the winding discs, so that lateral fraying is avoided.

The running in the region of the loop between the winding discs belt is to be performed at a small distance from the guide surfaces of the winding disks, on the one hand to avoid jamming of fibers in this area and on the other hand to prevent wear of the belt edges. Since the movement of the belt at the inlet between the winding discs transverse to the rotational movement of the winding disks, this would lead to a wear of the belt edges, if they would come to the winding disks quite to invest. It may be too Frayed belt edges come, which in turn have a negative effect on the formation of clean edge parts of the cotton wool to be created. This means that due to the fraying (eg protruding fibers of the belt braiding) fibers can be partially torn out of the edge parts of the wadding web. Therefore, z. As proposed in published DE-197 20 825 that the belt is guided positively in the region of the guide rollers transversely to its direction of movement. For this purpose, the belt was provided on a surface with a profiling, which engages in a similar counter-profile on the respective deflection roller. This ensures that the belt is exactly - transversely to the transport direction - out. There are more in this release as well

 Embodiments shown to ensure an accurate, lateral guiding the belt. Through these proposals, although the exact guidance of the belt between the winding disks could be achieved, but this was the

Use of a specially made belt and corresponding guide means on the pulleys necessary. This made this winding device much more expensive and expensive to manufacture.

In the published CH 695344 is proposed for lateral guidance of the belt, on each side of the belt ever to attach a guide roller over which the belt is continuously guided laterally. With this device, it was sometimes possible to guide the belt laterally, provided that no large lateral forces caused by a lateral drifting of the belt. A disadvantage of this belt guide, however, was the continuous friction of the guide rollers on the belt edges, which has also led to a low wear. However, as soon as the lateral forces have become too large in the lateral drifting of the belt, this led on the one hand to an increased wear of the belt edges in the region of the guide rollers and on the other hand, a deformation of the belt took place in the edge regions. This in turn led to an inaccurate side guide of the belt and also to an unclean wrap.

Furthermore, a plurality of devices are known from EP 1 675 976 B1, wherein sensors are provided on both sides of the belt, which monitor the lateral drifting of the belt. The sensors are designed or arranged that they only give a signal to control the course of the belt to the central controller when the belt has already drifted to one side. Furthermore, this publication describes that in order to return the belt to a predetermined tolerance range, at least one of the axes of the deflection rollers can be pivoted transversely to the direction of belt travel by means of an adjusting device. In this case, a bearing point of the deflection roller is moved via a control device controlled by a control device (in the example shown via a cylinder). A disadvantage of the known solutions is that the control pulse for correcting the lateral belt curve has only been triggered when it has already moved laterally by a certain amount. Moreover, it was necessary in the previous solutions to provide in the area of both belt edges sensors for monitoring the belt run.

It is an object of the invention to propose a device, wherein the

Monitoring and regulating the belt run of a commercial flat belt across its direction in relation to known solutions improved and

is simplified.

This object is achieved by proposing that at least at one point of the belt course outside the loop in the region of the

Side edges of the belt, a non-contact sensor is mounted, which is adapted to continuously detect the position of the scanned side edge of the belt and the sensor is connected to a control unit via which at least one adjusting device for returning the belt in a predetermined

Tolerance range is controlled.

 By using a continuously scanning the position of the belt

Sensor, it is ensured that a lateral drifting of the belt is detected immediately and corresponding control commands for returning to a desired position can be triggered early. The non-contact scanning is not subject to wear.

It is advantageous, as further proposed, the use of an ultrasonic sensor, which is particularly resistant to contamination, eg. B. by fiber fly is. This ensures a continuous function of the sensor. Instead of the ultrasonic sensor and the use of an optical sensor, for. B of a line sensor, possible. However, this does not have the insensitivity to contamination, as is the case with the ultrasonic sensor.

Preferably, the sensor is U-shaped, and in each case one of the free legs of the sensor of one of the surfaces of the belt in the region of

 Facing belt edge. Ie. one of the belt edges protrudes into the opening of the U-shaped sensor, wherein in each case an inner surface of the free legs of the U-shaped sensor facing one of the surfaces of the belt. In this case, the transmitting and the receiving part of the sensor are each attached to one of the legs, wherein the belt edge, depending on the position, projects into the scanning space between transmitter and receiver.

 Preferably, it is further proposed that the adjusting device is arranged adjacent to one of the bearing point of a deflection roller to move the bearing point in the radial direction in or against the inlet direction of the belt to the deflection roller.

This can be corrected by a simple change in the position of the axis of rotation of the deflection roller by means of the adjusting device of the belt.

Since very high forces are to be absorbed by the belt tensioning force in the region of the deflection rollers, it is advantageous if the bearing point is movably mounted in a guide and held by a pressure medium on a movably mounted and fixable adjusting means. Thus, a stable position of the movable bearing can be achieved. The pressure medium can, for. B. be a compression spring, the corresponding

can be biased.

 In order to minimize the frictional forces between the actuating means and the bearing, it is further proposed that the bearing is formed of a, on the axis of the guide roller rotatably mounted roller and the pressure means adjacent to the roller rests on the axis.

 The adjusting means may be a cam, on the outer circumference of the

Bearing point rests. Ie. Over the loading device (spring), the bearing point is held on the outer circumference of the cam and fixed. By a

According to the shape of the cam, it is possible to make very small travel to make appropriate corrections of the belt. For rotation, or adjustment of the cam is proposed that at least one, connected to the control unit drive means is provided which is directly or indirectly in driving connection with the cam.

The drive means may be an electric motor. It would be conceivable to use a stepping motor, via which very precise positioning steps are feasible.

 Due to the further proposal to connect the electric motor via a belt drive with a mounted on the axis of rotation of the cam drive wheel, allows the interposition of a translation stage.

By proposing to mount the guide of the bearing, as well as the adjusting means and at least a portion of the drive means for the actuating means in a substantially closed housing, one obtains an environment encapsulated device, which is protected from contamination.

 Further advantages of the invention will be described in more detail with reference to subsequent embodiments and shown.

Show it:

 Fig. 1 is a schematic side view of a winding device with an inventive monitoring and control device

Fig. 1a is a reduced sectional view A-A according to Fig.1

Fig. 2 is an enlarged schematic view X of the monitoring device in

Connection with an enlarged view U of the control device according to Fig.1 Fig.2a another embodiment of FIG. 2nd

3 is a view Y of the control device of FIG .. 2

4 is a diagram with a waveform of the monitoring device

Fig. 1 shows a winding device 1, which has already been shown in the already pre-published EP-A1-929 705 in a similar form and described in detail. Therefore, the operation of this winding device is described only superficially in the following description. In the winding device 1 shown is a

Wadding WW produced by means of a belt R. The belt R is guided over firmly mounted or pivotable rollers R1-R6, wherein it forms a loop S between the rollers R1 and R2 about a fixed axis of rotation AX. For producing a lap roll WW is about the calender rolls K1 to K4 a Cotton W is fed between the two rollers R1 and R2 in the loop S on the circumference of a sleeve H. The sleeve H is between two shown in Fig. 1a

Wickelscheiben W1, W2 clamped during the winding process. In this case, a distance a between the winding disks W1, W2 and the belt is provided so that the belt edge is not worn during the winding process. As the roll WW increases, the loop S increases until the roll WW has reached a desired size. The reaching of the winding diameter is determined either directly by corresponding sensors on the circumference of the coil or indirectly by scanning the supplied cotton length. During the winding process, the belt displacement, or the control of the belt tension force is performed via a tensioning device 3, which is controlled by a cylinder Z moves. By the tensioning device 3, a tension roller R6 is pivoted about an axis 4. During the winding process, the cotton roll WW turns into

Direction of rotation D. Shortly before the end of the winding process, the drive is the

Calender rolls K1-K4 are stopped, while the drive of the lap roll WW via the belt R is still in operation. This will cause the cotton wool in the area of

Guide plate 6 separated. Once the separation process is completed, the winding device 1 is stopped. About the arm 8, which is pivotable about the axis AX. the roller R2 is pivoted downward, whereby the roller R3 pivots about the arm 9 down. With the aid of the tensioning device 3, the belt R is further tensioned and the ejection of the finished lap roll WW carried out on a recording, not shown. After the ejection process is after

Swinging back the rollers R2, R3 in their position shown in Fig. 1 and, after a new sleeve H was introduced, a new winding operation started. For this purpose, the calender rolls K1-K4 are set in motion again by a drive not shown in detail. Likewise, by the drive not shown one of the rollers R1-R6 of the belt R and thus the winding device is set in motion, so that a new winding can be formed. As long as the calender rolls K1-K4 a cotton wool W is continuously supplied, the process described the winding formation can be carried out continuously. However, an interruption in the supply of cotton wool, z. B. in an expiring material template or a change in the fiber material to be processed, then it is necessary thread a new end of cotton wool between calender rolls K1-K4. Before feeding the new cotton wool, the cotton roll WW still in the loop S should be ejected and the winding device prepared for the formation of a new cotton wool wrap.

In order that the distance a shown in FIG. 1a to the two winding disks W1, W2 can be maintained, or the course of the belt can be monitored, a monitoring device 10 is arranged in the region in front of the roller R1. This monitoring device is formed by a U-shaped sensor 7, which is fixedly mounted on the machine frame MG and monitors the course of an edge RS of the belt. In Fig. 2, the U-shaped sensor is shown enlarged. On the basis of signals transmitted by the sensor of the monitoring device 10 to a control unit ST, control signals are generated on the basis of a program stored in the control unit, via which an adjusting device 11 is actuated in order to keep the belt in a predetermined tolerance range, or attributed to these.

Thus, the belt edge RS is not worn by friction on the winding disks W1, W2, it is necessary to maintain a minimum distance a to these winding disks. Depending on the tolerances in the bearings of the rollers R1-R6 and depending on the heating of the belt R, it may happen that the belt R drifts to one side or the other during the winding process. He can thus reach from a predetermined tolerance range, whereby the belt edge can come to rest on one of the winding disks. If the resulting friction between the belt and the respective winding disk is maintained, it can lead to frays in the belt edge RS. There is a risk that fibers are removed from the edge region of the roll WW by these frayings (projecting ends of the embedded cords), which results in an unclean roll. This in turn has negative effects in the following

Further processing on the comber, whereby quality losses must be accepted. To prevent such quality losses, therefore, a monitoring and adjusting devices is proposed, which is shown and described in more detail in subsequent embodiments. As can be seen from FIG. 2, one of the belt edges RS of the revolving belt R projects into a U-shaped monitoring device 10. The U-shaped monitoring device 10 is attached via a tab 22 on the machine frame MG and has two legs 28, 29, which are connected to each other via a web 27. On the inside of the legs 28, 29, which partially face the surfaces 01, 02 of the belt R, the transmitter part 25 ("transmitter" for short) and the receiver part 26 ("receiver" for short) of a sensor S1 are fastened. The sensor may preferably be an ultrasonic sensor. However, it is also conceivable to use an optical sensor.

As can be seen schematically from Fig. 2, the transmitter 25th

emitted signals (eg sound waves or light rays) partially from the

 Surface O1 of the belt R prevented from passing to the receiver 26. D. h., The transmitted by the transmitter 25 sound waves (using a

Ultrasonic sensors) arrive only partially at the receiver 26. These received pulses (see also diagram of FIG. 4) represent a value, via which can be determined by the control unit, whether the belt R transversely to his

Working direction AR outside a predetermined tolerance range T (Fig. 4) has moved.

 During the initial installation of the machine, the belt position is manually set to a desired position (see Fig. 4), as z. B. in the example of FIG. 2 is shown. The number of pulses received by the receiver in this position (setpoint) then becomes the

Control unit specified as a setpoint. Based on this once predetermined

Setpoint can then be determined via the control unit, the continuously supplied during operation signals (pulses), whether the belt drifts to one side or the other. As long as the value of the signals per unit of time is still within the specified tolerance range T (FIG. 4), no control signal for the

Actuator 11 issued. If, however, this value leaves (eg at the time t1 - FIG. 4) this tolerance range T, then a control signal is sent via the control unit ST via the line 24 to a servomotor MS.

 However, it is also conceivable to provide no tolerance range for the drifting of the belt, whereby the controller ST immediately emits an actuating signal to the adjusting device for immediate correction of the belt run at each lateral deflection of the belt. This means that the predetermined tolerance range can also be "zero" according to the claim form.

This servomotor MS, which is fastened to the machine frame MG, drives via its output shaft 16 a drive pulley 13, which is coupled via a belt 12 (eg a toothed belt) to a further drive pulley 14 and into

Drive connection is. The drive pulley 14 is non-rotatably mounted on a shaft 15 which is mounted on the bearings L1 and L2. These bearings L1, L2 can z. Example, be mounted in a schematically indicated in dashed lines housing 40, wherein the housing is attached to the machine frame.

 Axially parallel to the drive pulley 14 is also rotatably on the shaft 15 a

Excenter disc 17 is fixed, on whose circumference a receptacle 31 rests, which is connected to an axis 30. Also conceivable is a one-piece design of the axis 30 and the receptacle 31st

The receptacle 31 is held in the present example on the compressive force of a spring 19 on the peripheral surface of the eccentric disc. On the opposite side, the spring 19 crashes on a support 20, the z. B. may be attached to the machine frame MG. As can be seen in particular in FIG. 3 (side view Y according to FIG. 2), the receptacle 31 can move in a predetermined direction within a guide 18. The guide 18 is mounted in the embodiment of FIG. 3 within a housing 40. The spring 19 is held in its position in this embodiment via a cap 37 which is secured via its flange by means of screws SR to the housing and projects into the housing 40, in which they on the

Recording 31 rests. By using a housing, the cleanliness and thus the functionality of the actuator is guaranteed

On the axis 30, the guide roller R5 is rotatably supported via the bearings 34, 35, on which the belt R is guided or deflected. At the opposite end of the adjusting device 11, the axis 30 is mounted via a pivot axis 33 in a further receptacle 32. The pivot axis 33 allows pivoting (see double arrow) of the axis 33 in the direction AR of the belt R ₁ which has been shown schematically dash-dotted lines.

As soon as the pulse value output by the receiver 26 to the control unit is outside the predetermined tolerance range, a control signal is output to the servo motor (eg a stepping motor). Depending on the signal, the shaft 16 is rotated in one or the other direction by a predetermined amount. As a result, we also rotated via the belt connection 12, the drive shaft 15, via which the eccentric disc is also rotated by a certain amount. By the

Eccentricity of the disc 17, the receptacle 31 is moved under the action of the spring force of the spring 19 within the guide 18 by a certain amount.

By this displacement, the axis 30 is pivoted about the pivot axis 30. Thus, the roller 30 mounted on the axis R5 is pivoted by a certain angle to the belt running direction. This change creates a transverse displacement of the belt after a single revolution of the belt. This influences the belt running direction and returns the belt to the specified tolerance range T. With this device, it is possible to easily keep the belt in a predetermined tolerance position throughout the working process.

 In Fig. 2a, a further embodiment is shown, wherein instead of a fixedly mounted on the axis 30 receptacle 31, a roller 42 is used, which is rotatably mounted on a bearing 44 on the axis 30. Adjacent to the roller 42, the spring 19 is arranged, which is supported on the one hand on the support 20 and on the other hand on the axis 30 in a recess 43 provided. Advantageous in this

 Execution is the low coefficient of friction between the eccentric disc and the receptacle, or the roller 43, which is also guided in a guide 18 according to the embodiment of FIG. 3.

The adjusting device designed according to the invention is already inventive in its own right and could also be used with other than the, in the

Embodiment shown monitoring device 10th

Claims

claims 1. Device for monitoring and controlling the course of the belt at a  Device for producing a lap roll (WW), in which the lap (W) is wound onto a core (H) driven by a continuous, endless belt (R), the endless belt being formed in a loop (S) around the core (FIG. H) is guided over a plurality of deflection rollers (R1 - R6) and the core is held between two winding disks (W1, W2) projecting beyond the core in the radial direction, characterized in that at least at one point of the course of the belt outside the loop (S) in FIG Area of one of the margins (RS) of the belt (R) a non-contact sensor (S1) is mounted, which is adapted to continuously detect the position of the scanned side edge (SR) of the belt (R) and the sensor (S1) connected to a control unit (ST) is, via which at least one adjusting device (11) for returning the belt in a predetermined tolerance range (T) can be controlled. 2. Apparatus according to claim 1, characterized in that the sensor (S1) is an ultrasonic sensor. 3. Device according to claim 1, characterized in that the sensor (S1) is an optical sensor. 4. Device according to one of claims 2 to 3, characterized in that the sensor (S1) is U-shaped, and in each case one of the free legs (28, 29) of the sensor (S1) one of the surfaces (01, O2) of the belt (R) in the area of Belt edge (RS) face. 5. Device according to one of claims 1 to 3, characterized in that the adjusting device (11) adjacent to one of the bearing point (31, 42) of a deflection roller (R5) is arranged to the bearing point (31) in the radial direction in or against the Entry direction (AR) of the belt (R) on the pulley (R5) to move. 6. Apparatus according to claim 5, characterized in that the bearing point (31, 42) in a guide (18) is movably mounted and via a pressure means (19) on a movably mounted and fixable adjusting means (17) is held. 7. The device according to claim 5, characterized in that the bearing point of a, on the axis (30) of the guide roller (R5) rotatably mounted roller (42) is formed and the pressure means (19) adjacent to the roller (42) on the axis ( 30) rests. 8. Apparatus according to claim 6 or 7, characterized in that the adjusting means is a cam (17), on the outer circumference of the bearing point (31, 42) rests. 9. Apparatus according to claim 8, characterized in that at least one, with the control unit (ST) connected to drive means (MS) is provided, which are directly or indirectly in driving connection with the cam disc (17). 10. The device according to claim 9, characterized in that the drive means is an electric motor (MS). 11. The device according to claim 10, characterized in that the electric motor (MS) via a belt drive (12, 13) with one on the axis of rotation (15) of the  Cam (17) fixed drive wheel (14) is in drive connection. 12. Device according to one of claims 6 or 7, characterized in that the guide (18) in a substantially closed housing (40)  is housed. 13. The apparatus according to claim 12, characterized in that also the adjusting means (17) and drive elements (12, 13, 14) are arranged for the adjusting means within the housing. 14. Device according to one of claims 6 or 7, characterized in that as pressure means springs (19) are used.