EP1593630B1 - Device for preparing a web wound into a stock roll - Google Patents

Abstract

Several radius measurement sensors (9, 11) are located parallel to the longitudinal axis (16) of the supply roll (1). They contact the supply roll, or are non-contacting sensors. They are optical or acoustic. The measurement beam of the sensors includes an angle (alpha ) of +-15[deg] with the horizontal, or is horizontal. The sensors are located at the side of the roller, at least three sensors being situated adjacently. There are at least a pair of sensors on diametrically-opposite sides of the roller. From the sensors, an analysis unit (26) determines variations from the ideal shape of the roller. Departures from roundness, are registered from radius variations and comparisons. Comparisons of radii from the group of sensors, establish any roll conicity. The evaluation unit is also implemented as a controller (24) using a common processor (13). This controls the adhesive tape dispenser. An interface provided, reads a data set in and out. The unit writes the measured radius and its departures into the data. The sensors (9, 11) are arranged in a unit applying adhesive tape (17). This can be moved parallel to the axis (16). Two rotary rollers (3) are associated with the supply roll and are positioned at differing heights, in accordance with the radius of the supply roll.

Description

The invention relates to a device for preparing a material web wound into a supply roll according to the preamble of claim 1.

To prepare the roll change brings a device, for. B. DE 102 35 784 A1 at the outer end of a web, which is wound into a supply roll to be loaded, an adhesive tape strip in the transverse direction, on the one hand adheres the outer end to an underlying layer of the web and thus prevents uncontrolled unwinding of the web, if this during the roll change to a running speed the unwound from the stock roll to be replaced unwinding current web is accelerated, and on the other hand serves for adhering the web of the supply roll to be loaded to the moving web. As soon as the circumferential speed of the supply roll to be loaded has reached the speed of the moving material web, the supply roll to be fed in and the moving material web are pressed against one another. As a result, the outer end comes into contact with the strip of adhesive tape of the material web wound onto the rotating supply roll to be loaded with the moving material web from the supply roll to be exchanged and is glued to it. The running material web tears the web of material glued to it, wherein the adhesive tape strip is pulled off from the position of the material web lying under the outer end, and threads the material web of the supply roll to be loaded into the machine. After adhering the material webs together, the moving web is severed at a point between the tape strip and the supply roll to be replaced.

In practice, however, it frequently happens that stock rolls to be loaded differ from an ideal cylindrical shape. For example, the supply roll after a long Storage times at a location where it is deposited on the ground, be flattened due to their own weight. The web can also be wound incorrectly, so that the supply roll z. B. has a conical or an eccentric outer shape. In addition, the supply roll may be locally depressed due to previous bumps during transport of the supply roll or due to inadvertently bouncing against the supply roll objects. Such deviations in shape prove to be particularly critical during reel change, where the web is subjected to very strong forces as it is entrained in the running web. If the tape strip is not pressed as a result of deviations in shape of the supply roll over its entire length against the moving web, the web to be loaded can tear longitudinally. This makes it necessary to interrupt the operation of the web processing machine, the replacement of the damaged webs and possibly even repairs to the machinery.

The DE 199 05 140 A1 describes method and apparatus for preparing the supply roll, wherein by means of a single distance sensor, a deviation of the diameter of a supply roll is determined by a predetermined diameter.

The DE 695 01 317 T2 and the DE 26 27 103 A1 discloses devices with a diameter of a supply roll is detected.

By the JP 08-002 757 A For example, an obliquely adjustable pressure roller is known in a device for joining webs.

The invention has for its object to provide a device for preparing a wound to a supply roll web.

The object is achieved by the features of claim 1.

The advantages achieved by the invention are, in particular, that in the apparatus, the rotation of the supply roll, which in any case takes place for the application of the adhesive tape, is advantageously utilized for detecting the radius of the supply roll. The knowledge of the radius allows the detection of deviations of the detected radius of the supply roll from an ideal radius, i. H. deviations of the shape of the supply roll from an ideal cylindrical shape. A roll changer, which adheres the material web of the stock roll prepared for the roll change to a moving material web, compensates for these form deviations. Thus, the adhesive tape is adhered cleanly over its entire length to the moving material web, and the splices withstand the tensile stresses that occur. Damage to the material webs and production losses are avoided. Because the sensor is installed in the device for applying the adhesive tape to the material web of the supply roll to be loaded and thereby advantageously exploits the rotational movement of the supply roll during the application of the adhesive tape for detecting the radius of the supply roll, no additional measuring stations for detecting the radius are necessary. As a result, an arrangement with a device for applying the adhesive tape and a roll changer remains compact and space-saving, and also the number of operations to be performed sequentially for the roll change is not increased despite the additional detection of the radius of the supply roll.

Basically, the sensor can scan the supply roll either touching or he can feel the supply roll contactless. If it is a non-contact scanning sensor, the sensor may be an optical or an acoustic sensor.

If the device comprises a sensor which detects its radius along a circumference of the supply roll during the rotational movement of the supply roll, flattening of the supply roll or locally depressed points of the supply roll can be detected therefrom. However, several sensors are preferred in the width of the supply roll arranged staggered so that the supply roll can be examined for deviations from the ideal shape over its entire width and in particular a conical deformation of the supply roll can be determined.

Also particularly preferably, the sensor is part of a sensor pair for scanning diametrically opposite sides of the supply roll. While a sensor or sensors arranged on one side require a full turn of the supply roll to scan its entire circumference, in an arrangement with diametrically opposed sensors, half a turn of the supply roll is sufficient to detect its entire circumference.

The device may comprise an evaluation unit, which compares the radius detected by the sensor with an ideal radius and determines a deviation between the two. In the presence of sensor pairs with diametrically opposed sensors, the evaluation unit can be set up to detect a deviation from the ideal radius because the radii respectively detected by the sensors of the sensor pair are different from each other. An ideal radius is in this case when the sensors of the same pair of sensors detect the same radii.

In this case, the evaluation unit and a control unit which controls the application of the adhesive tape in the device can be implemented by two separate processors. However, it is more advantageous because it is simpler to provide a single processor by which both the evaluation unit and the control unit for controlling the application of the adhesive tape are implemented.

In the apparatus may further be provided an interface for reading and reading a record. This data set can be a dataset associated with the supply roll from the manufacturer's side with specific data of the supply roll, as is customary in the paper industry today. Such a Record is provided for each individual supply roll and accompanies the supply roll from its production to its final consumption. All process steps to which the supply roll has been subjected since its manufacture are noted in this data record, so that the data record allows the history of the supply roll to be understood. For these reasons, the device is preferably configured to write the detected radius in the data set. If the device has an evaluation unit, the deviations determined by the evaluation unit are also preferably written into the data set. If the radii of the supply roll or deviations detected by the sensors are stored in this already existing data record, it is particularly easy for the roll changer following the device in the production process to obtain information about the detected radii or deviations and to compensate for possible form deviations of the supply roll.

To compensate for deviations of the supply roll from the ideal cylindrical shape, the roll changer can comprise a frame and a pressure roller mounted therein for pressing the current web in unwinding against the supply roll to be loaded the material web provided with the adhesive tape, wherein the pressure roll differs to compensate for the deviations in the frame is positionable. Furthermore, a reel changer may comprise a bearing in which the supply roll to be loaded is mounted on the material strip provided with the adhesive tape, and in which this supply roll can be positioned differently to compensate for the deviation.

A reel changer preferably comprises a control device which is set up to recognize the supply roll to be loaded due to the deviation as unsuitable for use in the machine processing the material web and to separate the supply reel.

Embodiments of the invention are illustrated in the drawings and will be described in more detail below.

Fig. 1

eine Seitenansicht einer Vorrichtung zum Aufbringen eines Klebebandes auf eine zu einer Vorratsrolle gewickelten Materialbahn;

Fig. 2

eine Vorderansicht der Vorrichtung aus Fig. 1;

Fig. 3

eine vereinfachte Seitenansicht eines Teils eines Rollenwechslers mit in Abwicklung befindlicher Vorratsrolle und einer mit Klebeband versehenen Vorratsrolle;

Fig. 4a)

den Rollenwechsler der Fig. 3 in Blickrichtung der Materialbahn mit konisch verformter Vorratsrolle;

Fig. 4b)

den Rollenwechsler aus Fig. 3 mit verstellter Andrückwalze;

Fig. 4c)

den Rollenwechsler aus Fig. 3 mit verstellter Vorratsrolle.

Show it:

Fig. 1

a side view of an apparatus for applying an adhesive tape on a wound to a supply roll material web;

Fig. 2

a front view of the device Fig. 1 ;

Fig. 3

a simplified side view of a portion of a roll changer with befindlicher supply roll and an adhesive provided with supply roll;

Fig. 4a)

the reel splitter the Fig. 3 in the direction of view of the material web with a conically deformed supply roll;

Fig. 4b)

the reel changer Fig. 3 with adjusted pressure roller;

Fig. 4c)

the reel changer Fig. 3 with adjusted supply roll.

Fig. 1 shows a side view of an apparatus for applying an adhesive tape on a web end 14 of a wound up to a supply roll 01 with a longitudinal axis 16 material web, for. B. paper web. Fig. 2 is the associated front view of the device. A lifting device 02 comprises two height-adjustable, rotatably driven rollers 03, on which the supply roll 01 rests. The rollers 03 are preferably positioned according to different roller diameter at different heights. A movable arm 04 of the device has rollers 06 for gripping the material web end 14 at one end. The arm 04 is pivotable in order to pull the material web end 14 of the material web detected by the rollers 06 onto a work table so that the leading edge of the material web is in the working region of a cutting / adhesive tape dispensing device 08 comes to rest. The cutting / adhesive tape dispensing device 08 is displaceable along a rail 07 in the longitudinal direction of the supply roll 01 in order to apply an adhesive tape 17 to the front edge of the material web.

Sensors 09 and / or these diametrically opposite sensors 11 are arranged at the level of the longitudinal axis 16 of the supply roll 01 with a view towards the lateral surface of the supply roll 01. As in particular in the front view of the Fig. 2 can be seen, in each case a plurality of sensors 09; 11 in the width of the supply roll 01 each preferably arranged equidistantly on a rail 12. The sensors 09; 11 each have the same distance to a median plane between the rollers 03 and thus, when the supply roll 01 is ideally round, also from its longitudinal axis 16. The sensors 09; 11 are connected to a processor 13 in connection, on which a control unit 24 and an evaluation unit 26 are implemented. The processor 13 is provided with an interface for reading and outputting records indicating a set of characteristics characteristic of each supply roll 01 processed in the apparatus.

To provide the supply roll 01 in the apparatus shown with an adhesive tape 17, the web end 14 of the supply roll 01 is taken by the rollers 06 of the arm 04. The arm 04 pulls the material web end 14 to the cutting / adhesive tape dispensing device 08. At the same time, the rollers 03 of the lifting device 02 are rotationally driven, so that the supply roll 01 rotates about its longitudinal axis 16. Of the slidable along the rail 07 cutting / adhesive tape dispensing device 08, the web end 14 is then provided with an adhesive tape 17. The movements of the arm 04 and the cutting / dispensing device 08 are controlled by the control unit 24 implemented on the processor 13.

While the web end 14 from the arm 04 for cutting / adhesive tape dispensing device 08 is pulled and the supply roll 01 rotates, detect the sensors 09; 11 each consecutively the distance between them and the lateral surface of the supply roll 01. Since the distance of the sensors 09; 11 is fixed from the center plane, the detected distance is directly representative of the radius of the supply roll 01. The sensor 09; 11 detected distance is transmitted to the processor 13 implemented on the evaluation unit 26. After half a rotation of the supply roll 01, the evaluation unit 26 has measured values of the entire lateral surface of the supply roll 01.

Preferably, a measuring beam of the sensors 09 closes; 11 with a horizontal an opening angle α of + 15 ° to -15 °. Particularly preferred is a measuring beam of the sensors 09; 11 arranged approximately horizontally.

The sensors 09; 11 are arranged laterally to the supply roll 01. A measuring beam of the sensors 09; 11 is preferably arranged approximately radially to the supply roll 01.

The evaluation unit 26 averages the totality of the sensors 09; 11 radii detected and checks whether the average is within a target range. If this is not the case, the supply roll 01 is not suitable for use in the roll changer and is eliminated.

By comparing the radii with each other, the evaluation unit 26 is also able to determine whether the supply roll has 01 bumps, and where they lie on the supply roll 01. If a bump is present, it is checked whether it is in a place where later the web end 14 will come to rest with the tape strip. If so, this would hinder the flying role change; However, this can be remedied by the supply roll 01 is further unwound and is cut off by the cutting / tape dispensing device 08, so that the newly obtained during cutting material web end 14 no longer lie on the bump comes.

If the radii detected by two respectively opposite sensors 09 and 11 differ or develop differently during the rotation of the supply roll 01, this indicates a non-circular shape of the supply roll 01. If the evaluation unit 26 determines that the out-of-roundness exceeds a predetermined amount, the supply roll 01 is unsuitable and is sorted out.

If the radii detected by the sensors 09 or 11 of a group depend on the position of the sensors 09; 11 in the width direction of the supply roll 01, this indicates a conicity of the supply roll 01 out. This is also determined by the evaluation unit 26.

The evaluation unit 26 carries the results of the evaluation of the measured values of the sensors 09; 11 in the supply roll 01 associated record.

After evaluating the measurement results by the evaluation unit 26 and applying the adhesive tape 17 to the material web end 14 by the cutting / Klebbandspendeeinrichtung 08, the rollers 03 are driven in the opposite direction to retract the web end 14 on the body of the supply roll 01 and one on the material web end 14th To attach projecting portion of the adhesive tape 17 to the supply roll 01. Depending on the decision by the evaluation unit 26 on the usefulness of the supply roll 01 this is forwarded to an automatic reel splicer or eliminated.

Fig. 3 shows a simplified representation of a part of a roll changer from a lateral view. From a supply roll 22 to be replaced, a moving material web, for. B. a paper web 21 handled. The supply roll 22 is to be exchanged for the provided with the adhesive tape 17 supply roll 01. The supply roll 01 is below the Paper web 21 rotatably held. Above the paper web 21 at the level of the supply roll 01, a pressure roller 18 is provided. The two supply rollers 01 and 22 and the pressure roller 18 are mounted in a frame 19, which in the following Fig. 4a) to 4c ) you can see.

Since the paper web 21 is unwound from the supply roll 22 at a considerable speed, the supply roll 01 is first accelerated by the roll changer to a rotational speed at which its peripheral speed corresponds to the running speed of the paper web 21. After the supply roll 01 has reached the running speed of the paper web 21, it is pressed against the paper web 21 by adjusting the axis of the pressure roller 18 and / or the supply roll 01. As a result of the rotation of the paper web 01, the adhesive tape 17 comes into contact with the paper web 21. After the adhesive tape 17 has adhered to the paper web 21, the paper web of the supply roll 01 is taken away from the paper web 21 and drawn into a printing press passed through by the paper web 21.

If the supply roll 01 deviates from an ideal cylindrical shape, it is not ensured that the adhesive tape 17 adheres sufficiently firmly to the paper web 21 over its entire length.

Fig. 4a ) illustrates this problem by means of a front view of the roll changer from a viewing direction parallel to the paper web 21 at a time prior to bonding of the two paper webs. The supply roll 01 is in the Fig. 4a ) to illustrate the facts exaggerated strongly conical. As can be seen from this illustration, the paper web 21 can not be pressed over its entire width against the supply roll 01 by the pressing roller 18 which presses it down when sticking on account of the conical shape of the supply roll 01. This would lead to a poor bonding of the adhesive tape 17 to the supply roll 21, with the result that the bond dissolves when the paper web of the supply roll 01 of the running paper web 21 is entrained.

The reel changer receives together with the supply roll 01 via a suitable interface and the record associated with this supply roll. On the basis of the information contained in it about the conical shape of the supply roll 01, it provides as in Fig. 4b ), the pressure roller 18 is slightly inclined, so that its surface facing the supply roller 01 is exactly parallel to the opposite surface of the supply roller 01, as in FIG Fig. 4b ). When the pressure roller 18 is moved vertically downwards from this position, it presses the paper web 21 against the entire width of the supply roll 01.

Alternatively, it can also be provided that the storage of the supply roll 01 inside the frame 19 permits a pivoting of the axis of the supply roll 01 in such a way that the mutually facing surfaces of the conical supply roll 01 and the pressure roll 18 become parallel, as in FIG Fig. 4c ).

It is also possible to arrange the sensor for determining the radius or the shape tolerances or positional tolerances when turning the supply roll in unpacking station, in a special station or in the reel changer itself.

LIST OF REFERENCE NUMBERS

01

supply roll

02

lifter

03

role

04

poor

05

-

06

roller

07

rail

08

Cutting / tape dispensing device

09

sensor

10

-

11

sensor

12

rail

13

processor

14

Web end

15

-

16

longitudinal axis

17

duct tape

18

pressure roller

19

frame

20

-

21

paper web

22

supply roll

23

-

24

control unit

25

-

26

evaluation

α

opening angle

Claims (21)

1. Apparatus by means of which a material web wound into a supply roll (01) is prepared for a flying roll change, having a bearing for supporting and rotating the supply roll (01) about a longitudinal axis (16), wherein at least one sensor (09; 11) is provided for sensing a radius of the supply roll (01) during the rotary movement thereof, characterized in that a plurality of radius-sensing sensors (09; 11) are arranged in the direction of the longitudinal axis (16) of the supply roll (01).
2. Apparatus according to Claim 1, characterized in that the sensors (09; 11) are arranged so as to sense the supply roll (01) in contact therewith.
3. Apparatus according to Claim 1, characterized in that the sensors (09; 11) are arranged so as to sense the supply roll (01) without being in contact therewith.
4. Apparatus according to Claim 3, characterized in that the sensors (09; 11) are optical or acoustic sensors (09; 11).
5. Apparatus according to Claim 1, characterized in that a measuring beam of the sensors (09; 11) encloses an opening angle (α) of +15° to -15° with a horizontal.
6. Apparatus according to Claim 1, characterized in that a measuring beam of the sensors (09; 11) is arranged more or less horizontally.
7. Apparatus according to Claim 1, characterized in that the sensors (09; 11) are arranged laterally in relation to the supply roll (01).
8. Apparatus according to Claim 1, characterized in that at least three sensors are spaced apart one beside the other in the direction of the longitudinal axis (16) of the supply roll (01).
9. Apparatus according to Claim 1, characterized in that the apparatus has at least one pair of sensors (09; 11) for sensing diametrically opposite sides of the supply roll (01).
10. Apparatus according to Claim 1, characterized in that an evaluation unit (26) is provided for determining a deviation of the shape of the supply roll (01) from an ideal shape by way of measurement results from the at least one sensor (09; 11).
11. Apparatus according to Claim 10, characterized in that the evaluation unit (26) is set up to detect non-roundness of the supply roll (01) by way of the radius sensed by a sensor (09; 11) varying during rotation of the supply roll (01).
12. Apparatus according to Claims 9 and 10, characterized in that the evaluation unit (26) is set up to detect non-roundness of the supply roll (01) by way of a comparison of the radii sensed by the sensors (09; 11) of the pair of sensors.
13. Apparatus according to Claim 10, characterized in that the evaluation unit (26) is set up to detect conicity of the supply roll (01) by way of a comparison of the radii sensed by the sensors (09; 11) in the group.
14. Apparatus according to one of Claims 10 to 13, characterized in that the evaluation unit (26) and also a control unit (24) are implemented for controlling the adhesive-tape dispenser using a common processor (13).
15. Apparatus according to one of the preceding claims, characterized by the provision of an interface for reading a set of data in and out.
16. Apparatus according to Claim 15, characterized in that the apparatus is set up to write the radius sensed into the set of data.
17. Apparatus according to either of Claims 15 and 16 and one of Claims 10 to 13, characterized in that the apparatus is set up to write the deviation into the set of data.
18. Apparatus according to Claim 1, characterized in that the sensors (09; 11) are arranged in a means for applying an adhesive tape (17).
19. Apparatus according to Claim 1, characterized in that the apparatus has an adhesive-tape dispenser which can be moved in the direction of the longitudinal axis (16) of the supply roll (01).
20. Apparatus according to Claim 1, characterized by the provision of two rollers (03) which rotate the supply roll (01).
21. Apparatus according to Claim 20, characterized in that the two rollers (03) are positioned at different heights in dependence on a radius of the supply roll (01).

Images