WO2005075739A1

WO2005075739A1 - Roll-cleaning device and method for cleaning a roll

Info

Publication number: WO2005075739A1
Application number: PCT/FI2004/000761
Authority: WO
Inventors: Markku Kojo
Original assignee: Metso Paper, Inc.
Priority date: 2004-02-05
Filing date: 2004-12-14
Publication date: 2005-08-18
Also published as: FI20040173A0; FI20040173A; FI116947B

Abstract

This publication presents a roll cleaning device (10, 101) for cleaning a surface or a coating of a fibrous web machine’s roll (1a, 1b, 1c) without removing the roll, which roll cleaning device comprises a cleaning means, which is arranged in a turning support beam (30) to be placed against the surface of a rotating roll. The roll cleaning device (10, 101) comprises a cleaning blade (11), which is adapted to be moved essentially in the axial direction of the roll (1a, 1b, 1c), that is, in a direction deviating by no more than ±10° from the direction of the roll axis, in order to clean the roll surface over the entire length of the surface or over an optional distance of the surface length. The cleaning blade (11) is adapted to be moved preferably in the direction of a guide bar (20). The publication also presents a method for cleaning a surface or a coating of a roll (1a, 1b, 1c) by the roll cleaning device (10, 101) in a fibrous web machine.

Description

Roll-cleaning device and method for cleaning a roll

The present invention relates to fibrous web machines, especially to calenders. The invention concerns a device and a method for cleaning the roll surface.

In paper- and board-making machines, velocities increase and a higher quality is required of the fibrous web, whereby growing demands are also made on long-standing cleanness of the roll coating of calender rolls used in these machines.

During calendering solid material attaches from the fibrous web to the surface of the calender roll, such as coating and adhesive matter and dirt, which results in running problems and in a declining quality of the end product. The cleaning of rolls to be performed in the calenders during the run has constituted a problem, which cleaning is done with the aid of a doctor blade, as is known.

As regards the state of the art relating to the invention, reference is made to published application DE 199 61 666, which presents the surface cleaning device of a roll work- ing on the rotating-cleaning-disc principle, which cleaning device is bearing-mounted in the doctor blade's support. The cleaning disc can be made to move in the axial direction of the roll surface during the operation of the calender, whereby the rotating cleaning disc will clean the roll surface.

When the calender is not running or is creeping without paper, the roll surface is usually cleaned using manual tools. A cleaning device using a short blade has also been developed, which is used manually at times when the calender is not being used for calendering. The device is not suitable for cleaning performed during running, because it has no equipment for moving the blade carrier. Roll cleaning during running works poorly with the present doctor blade when running coated grades, especially in a multi-roll calender. The roll surface is not cleaned, should dirt attach strongly to the roll surface. Moist coating material in particular will attach strongly to the roll surface under a heavy nip load. Cleaning off sticky dirt is also difficult when using a doctor blade. A shortcoming of the doctor blade is that its blade load cannot be increased into a range that would result in efficient cleaning without bending of the doctor blade and a poorer cleaning result for this reason. At the same time there is a greater risk of "biting" of the blade, that is, of a sudden par- tial penetration of the blade into the roll surface coating. On the other hand, a great constant blade load on the doctor blade will make the blade wear faster. The blade's oscillating motion in the doctor blade is short, usually less than 25 mm. Hereby dirt attaching to the blade will wear down the roll surface locally. In a multi-roll calender, the calender must be stopped and the thermo rolls must sometimes even be cooled in order to keep clean the blades of the doctor blade and to change blades, because the blades are in troublesome places where access is difficult close to the hot rolls. It is difficult to arrange collecting of the dirt worked loose by the doctor blade, because in a multi-roll calender the blade cannot always be placed in an optimum location so that the dirt can be collected together.

The problem of the rotating soft cleaning disc is its inefficiency when cleaning thick coating streaks and sticky dirt. A high cleaning efficiency cannot be achieved with the rotating cleaning disc. The calender roll must be cleaned quickly during the running, so that, for example, any coating streak attaching to the roll will not break the roll surface or ruin the paper being calendered. On on-line calender lines calendering a coated fibrous web, a high cleaning efficiency is required from time to time, when great quantities of additional coating material travels with the fibrous web to the calender, there mucking up many rolls. Known devices are not capable of efficient cleaning, but cleaning must be done manually and it takes much time, even 40-60 min/roll. The cleaning work is heavy and hazardous due to hot rolls and nip hazards. There is also a risk of roll cleaning tools getting into nips between rolls, whereby roll coatings will break.

The present invention aims at providing a novel and inventive device and method for cleaning the roll surface that will solve or at least minimize the above-mentioned problems and shortcomings.

In order to achieve the objectives mentioned above as well as those emerging hereinafter, the cleaning device according to the invention is mainly characterized by the features presented in the characterizing part of Claim 1, and the method according to the invention is mainly characterized by the features presented in the characterizing part of Claim 19.

The result of surface or coating cleaning achieved by the roll cleaning device and method according to the invention is of uniform quality, and the rolls will not wear unevenly as will happen when cleaning with a dirty doctor blade. The cleaning result is not sensitive to circumstances, such as the condition of the roll surfacing to be cleaned, the working parameters used and the person doing the cleaning. It is possible during running to change the blade load of the cleaning device's cleaning blade without impairing the cleaning result. The device has a high cleaning efficiency and dirt removing ability per unit of time, and the collection of dirt removed from the surface is arranged to be easy. The roll cleaning device allows cleaning off with a single sweep of coating, adhesive or dirt accumulated on the roll surface.

The roll cleaning device and method according to the invention are suitable for cleaning both soft and hard, surfaces and coatings of rolls in the multi-roll calender, such as, for example, the one known as OptiLoad TwinLine, the applicant's brand, in a fibrous web machine, especially a paper-making machine. The structure of the roll cleaning device can be formed for fitting into cramped places. Exchanging or cleaning of the roll cleaning device's cleaning blade is arranged to be easy and quickly done, so the cleaning blade can be exchanged or cleaned also when running the cal- ender. The device is safe to use, because the operator need not go dangerously close to the rotating and possibly hot rolls and roll nips, as is the case when using manual tools. At the same time the risk of damage to the roll coating is eliminated, because no manual tools are used.

When cleaning a roll surface or coating with the roll cleaning device and method according to the invention, savings are achieved, as the calender need not be stopped and hot rolls need not be cooled for the time of cleaning. This means that broke must not be run due to stopping of the calender, which will result in savings especially in the on-line running of a fibrous web machine. Savings also result in prolonged ser- vice life in the calendering of rolls, since cleaning of the roll can be done on-line and rolls need not be removed from the calender for the time of cleaning.

The invention will be described in the following by referring to the appended basic figures, which are used to illustrate the roll cleaning device and method according to the invention, however, without limiting the invention only to that which is presented in the figures.

Figure 1 is a view of a roll cleaning device according to an advantageous embodiment of the invention seen from one end of the roll.

Figure 2 is a view of a roll cleaning device- according to a modification of an advantageous embodiment of the invention seen from one end of the roll.

Figure 1 shows a part of a roll stack or a roll stack formed by three superimposed rolls la, lb and 1 c in the calender, preferably a multi-roll calender, of a fibrous web machine. The roll cleaning device 10 is shown beside a horizontally located roll lb on the right-hand side in its cleaning position, where the cleaning blade 11 functioning as the cleaning means is pressed against the surface of roll lb. The cleaning blade is arranged in Figure 1 below the rotational axis of roll lb, as the surface of roll lb is moving from below upwards on the side of roll cleaning device 10. The direction of rotation of rolls la, lb and lc is indicated in a corresponding order by arrows a, b and c. The figure shows one roll cleaning device 10 only. The roll cleaning device may be arranged in different roll positions of a multi-roll calender, that is, in practice a sepa- rate roll cleaning device may be arranged for each calender roll of the multi-roll calender. The roll cleaning device 10 may be used both for rolls and roll coatings with a soft surface and for those with a hard surface. The roll cleaning device 10 is exchangeable between different roll positions, should the space allow, and in the exchange of rolls the roll cleaning device 10 can be removed and exchanged in a similar manner as a doctor blade.

Roll cleaning device 10 comprises a removably connectable support beam 30, a guide bar 20, moving parts of the roll cleaning device 10 bearing-mounted on the guide bar 20 and an energy transfer chain 32, with which the roll cleaning device's 10 energy, communication and flow connections are arranged and wherein the required cabling and pipework are located. The guide bar 20 is attached to the support beam 30. During roll cleaning, support beam 30 is in a fixed position in relation to the roll's lb axis of rotation. Support beam 30 may be attached at both its ends to existing structures of the multi-roll calender, for example, in a manner similar to a doctor blade beam, that is, the support beam 30 may be attached with brackets to bearing housings of the calender rolls or to relieving and loading arms not shown in the figures. Said brackets can be simply and easily removed in the roll exchange. Support beam 30 may be arranged so that it can be turned manually in relation to its axis of rotation 31, or support beam 30 may be arranged so that it can be turned in relation to its axis of rotation 31 by a drive not shown in the figures. The axis of rotation 31 is preferably in the horizontal position, which generally means that the axis of rotation 31 is preferably parallel to the axis of roll lb. The roll cleaning device's 10 blade holder 15 can be moved farther off and closer to roll lb by turning the support beam 30. This turning motion in relation to the axis of rotation 31 is arranged at least as a manual motion for adjusting the roll cleaning device 10 and for placing it in a suitable position in relation to roll lb and in relation to the other rolls of the calender, such as in relation to take-off rolls. In addition, in case a separate drive is arranged to turn the support beam 30, the turning motion in relation to axis of rotation 31 can also be used as a rough approaching motion for the roll cleaning device's 10 cleaning means. The basic setting of cleaning blade 11 in relation to the surface of roll lb is arranged by providing support beam 30 with such an attachment that the support beam's 30 desired position in relation to roll lb can be chosen in the direction of the axes of the system of coordinates x-y shown in Figure 1, that is, in the horizontal direction in the direction of axis x and in the vertical direction in the direction of axis y.

It is a characteristic of roll cleaning device 10 that the roll cleaning device's 10 cleaning blade 11 can be moved essentially in the direction of the axis of roll la, lb, lc, that is, in a direction deviating by no more than ±10° from the direction of the roll axis, preferably the cleaning blade 11 can be moved along the guide bar 20 arranged in parallel with the roll's lb axis of rotation. If the direction of the transverse path of cleaning blade 11 were to deviate by more than 10° from the direction of the roll's lb axis, the cleaning blade's 11 contact with the surface to be cleaned would suffer essentially from the viewpoint of cleaning. The cleaning blade 11 follows the surface or coating of the rotating roll lb cleaning the surface over its entire length, or the roll's lb surface may also be cleaned over an optional part of the surface length, if, for example, the streak or stripe formed by dirt is local. Hereby the roll cleaning device's 10 cleaning blade 11 is brought into contact with that area of the roll's lb surface, which has become dirty, for example, over an area of a length of 600 mm in the cen- tral area of the roll measured in the lengthwise direction of the roll. Rotation of the roll lb in connection with cleaning means that when using the roll cleaning device 10 the calender roll of the multi-roll calender rotates, for example, when on-line or offline calendering a fibrous web, or the calender may be creeping, or the calender roll lb may, for example, be rotated without any fibrous web in the calender, or the roll lb may be rotated by a separate drive without any fibrous web. Thus, the roll cleaning device 10 may also be adapted for use in cleaning the rotating roll of a calender standing idle.

The roll cleaning device's 10 two-piece carrier 19a, 19b is arranged for movement along the guide bar 20 in the direction of the roll's lb axis of rotation by a drive not shown in the figures. The two-piece carrier 19a, 19b comprises the carrier's top piece 19a on the guide bar side and the carrier's bottom piece 19b, which is bearing- mounted to the carrier's top piece 19a with a joint 19c and which is bearing-mounted to turn by more than 90° in relation to the carrier's top piece. The bearing-mounting of the carrier's bottom piece 19b implemented with joint 19c is arranged in order to make easier and speed up the exchanging or cleaning of the roll cleaning device's 10 cleaning blade 11 also when the calender is running. It is safe to use the roll cleaning device 10, because the operator need not go dangerously close to the rotating and possibly hot rolls la, lb, lc and the roll nips formed in between said rolls, as when using manual tools. At the same time the risk of damage to the roll coating is eliminated, because no manual tools are used.

In the cleaning position of cleaning blade 11, the carrier's bottom piece 19b is in the position shown in Figure 1, whereby cleaning blade 11 is pointing toward roll lb. Arrow 19' illustrates the turning of the carrier's bottom piece 19b in relation to the carrier's top piece 19a on the guide bar side. The drive for moving the roll cleaning device 10 along guide bar 20 is preferably arranged in the end area of support beam 30 and guide bar 20 in such a way that the drive will not prevent the movement of the roll cleaning device's 10 parts moving along guide bar 20, such as the carrier 19a, 19b, in the cleaning area. Said drive, such as an electric motor, is preferably arranged to drive a toothed belt not shown, which is located to travel in the area of guide bar 20 and which is connected to the carrier's top piece 19a to move it along guide bar 20. One end of the energy transfer chain 32 is attached in the area of one end of guide bar 20 attached to the support beam 30 and the other end of the energy transfer chain 32 is attached to the carrier's top piece 19a.

Alternatively, the drive for moving the roll cleaning device 10 along guide bar 20 may be located in the carrier's top piece 19a. Said drive may be, for example, an electric motor with a toothed wheel on its shaft in tooth contact with, for example, a toothed rack or toothed belt located in the direction of guide bar 20.

Guide bar 20 is mounted on one side to support beam 30 and on the other side to the carrier's top piece 19a. The guide bar 20 preferably comprises a roller guide, whereby the longitudinal guide surfaces are attached to the support beam 30 in the direction of the roll's lb axis of rotation and the guide rollers are bearing-mounted to the carrier's top piece 19a. The guide bar's 20 longitudinal static part may be, for example, of a knife-like shape, whereby the shape of the guide rollers corresponds with the knife- like shape of the longitudinal guide bar. Advantages of such a roller guide are the low weight of the structure, especially on the side of the carrier's top piece 19a, a low rolling friction and the possibility to arrange the guide rollers at a suitable distance far from each other in the guide bar's 20 lengthwise and cross- wise directions in order to guarantee a sufficient torque tolerance and rigidity for the roll cleaning device 10, especially in order to guarantee a good cleaning result for the cleaning blade 11.

The short cleaning blade 11 of roll cleaning device 10 is attached to a holder 12, which is bearing-mounted through a blade holder 15 and a reversal link 16 to the carrier's bottom piece 19b. The reversal link 16 is preferably in a horizontal position. The blade holder 15 has a joint 13, with which the cleaning blade's 11 holder 12 is rotatingly bearing-mounted to blade holder 15. Joint 13 is preferably in a horizontal position. In blade holder 15 on both sides of joint 13 there are loading devices 14, which through holder 12 act on cleaning blade 11 and which are, for example, a com- pressed air bellows, such as hoses. One purpose of the reversal link 16 is to make advantageously possible quick removal of cleaning blade 11 from the surface of roll lb, for example, if so required by a web break or some other interruption in the cleaning. In some applications, the blade holder's 15 motion around reversal link 16 may also be used as a work motion of the cleaning blade 11 directed against the roll sur- face. Said quick removal of cleaning blade 11 from the roll surface is implemented by an actuator 18, by which blade holder 15 can be turned around reversal link 16 in relation to the carrier's bottom piece 19b in such a way that the cleaning blade 11 will come off the roll surface. Actuator 18 may be, for example, a piston-type cylinder actuator, one end of which is attached in connection with the carrier's bottom piece 19b and the other end of which is attached in connection with blade holder 15. Wear of cleaning blade 11 or wear of the roll surface/a change of the roll diameter requires an adjustment, which is implemented by a horizontal movement 19" of carrier 19a, 19b and a stopper (not shown) stopping the blade holder 15 turning around reversal link 16. When it is desired to reduce the blade angle A of cleaning blade 11, the blade holder 15 is turned in relation to reversal link 16 so that cleaning blade 11 will be out of cleaning contact with the surface of roll lb, the carrier 19a, 19b is transferred by a horizontal movement 19" closer to roll lb and blade holder 15 is turned against said stopper, which stopper determines the extreme point of the turning movement of blade holder 15 around reversal link 16. In the shown system of coordinates x-y, the horizontal movement 19" is in the direction of axis x. The horizontal movement may be implemented, for example, by a linear guide bar and a cylinder actuator.

The actual movement of roll cleaning device 10 approaching the roll surface prior to the cleaning is one performed by the. cleaning blade's 11 turning movement supported by holder 12 around joint 13 under a load exerted by loading devices 14, which turning movement is illustrated in Figure 1 by presenting the cleaning blade with a dashed line in the described position 11' out of contact with the surface of roll lb. The roll cleaning device's 10 work movement is the carrier's 19a, 19b movement back and forth along guide bar 20, whereby the cleaning blade 11 follows the surface of roll lb loaded by loading devices 14. The cleaning device's 11 turning movement supported by holder 12 and loaded by loading devices 14 also functions as the roll cleaning device's 10 work movement.

The cleaning blade 11 is essentially more rigid than the blade of a normal doctor blade. Owing to the more rigid cleaning blade 11, it is possible in the roll cleaning device 10 to use a bigger blade angle and a heavier blade load than with a more flexible doctor blade. The cleaning efficiency is hereby improved. The blade angle of doctor blades is typically smaller than 20° when cleaning polymer rolls and typically about 25° when cleaning thermo rolls. With the roll cleaning device 10 according to the invention, the cleaning blade's 11 angle in relation to a tangent to the surface of the roll lb to be cleaned is blade angle A, which when cleaning hard rolls may preferably be more than 30°, and for polymer rolls it is possible to use smaller values than for hard rolls. The cleaning blade 11 may be of the same material as the doctor blades. Cleaning blade 11 comprises a cleaning bevel, the length of which is less than 1000 mm, preferably about 200 mm. What is essential in the cleaning edge 11 is the greater cleaning width it achieves in comparison with, for example, the cleaning width of the above-mentioned cleaning disc.

Cleaning blade 11 can be located at the desired angle and position in relation to roll lb by adjusting in the desired manner the combination of positions of joint 13, reversal link 16, the turning axis 31 of support beam 30, the x-y position of support beam 30 and the movement 19" of the carrier 19a, 19b in the x direction. In other words, the cleaning blade's 11 blade angle A can be adjusted by the roll cleaning device's 10 joints 13, 16, 31 or by the movement in the x-y direction by moving carrier 19a, 19b. The cleaning of roll lb can be controlled to take place constantly or at suitable intervals during the running of the calender. The roll cleaning device 10 may also be used, when the calender is not used for calendering, provided that roll lb is rotating. The carrier's 19a, 19b and thus the cleaning blade's 11 movement in the direction of guide bar 20 is provided with synchronization with the roll's lb rotational speed, so that cleaning blade 11 will clean the roll surface entirely while travelling in the axial direction of roll lb from one edge of the web to the other. The result of cleaning achieved by roll cleaning device 10 on the roll's lb surface or coating is of a uniform quality, and the rolls will not wear unevenly as will happen when cleaning with a dirty doctor blade. Owing to the possibility of adjusting the blade load of cleaning blade 11, it is possible with the roll cleaning device 10 to avoid unnecessary and extra wear of the calender roll lb, since the blade load of cleaning blade 11 can be changed to an optimum even during cleaning, that is, the blade load is adjustable to be as small as possible, but nevertheless so that it will guarantee a good cleaning result. The cleaning result is not sensitive to circumstances, such as the condition of the roll surfacing to be cleaned, the person doing the cleaning and the working parameters used. It is possible to change the load on the roll cleaning device's 10 cleaning blade 11 during the run without impairing the cleaning result. The wear of cleaning blade 11 is limited by a choice of the cleaning blade's 11 material and by the blade load used to be less than the wear of a doctor blade, so that the blade angle of cleaning blade 11 will not grow excessively. In this manner biting of the cleaning blade 11 into the roll surface is avoided.

The cleaning blade 11 can be exchanged or cleaned during the calender run, when the carrier 19a, 19b is stopped at the end of roll lb outside the web. The carrier's bottom piece 19b can be turned suitably in relation to the carrier's top piece 19a, so that cleaning blade 11 will turn well into the reach of a serviceman, whereby it is easy to exchange the cleaning blade 11, for example, from a hoist frame. In connection with cleaning blade 11, preferably in connection with blade holder 15 as shown in Figure 1, a dirt collecting trough 17 is connected. Dirt collecting trough 17 can be emptied by a suitable method during the run within the roll's lb end area in such a way that dirt will not get on to the paper web being calendered. The dirt collecting trough 17 connected to blade holder 15 can preferably be tilted by an actuator 18, which is used to turn blade holder 15 around reversal link 16 downwards in relation to the carrier's bottom piece 19b in such a way that dirt collected into dirt collecting trough 17 will exit or fall out of dirt collecting trough 17. To remove dirt it is also possible to use some other way, such as blowing or suction, and the removal of dirt from the dirt collecting trough 17 can be boosted, for example, by blowing compressed air, by suction or by bumping the dirt collecting trough 17 against a mechanical stopper while tilting it.

The dirt collecting trough 17 is emptied in connection with the reciprocating motion of carrier 19a, 19b, at both ends of roll lb when required, so no need for constant suction will arise in the roll cleaning device 10. The removal of a suction hose from carrier 19a, 19b can be seen as an advantage, whereby the energy transfer chain 32 need not be massive and need not take much space.

The cleaning result of roll cleaning device 10 may be improved by using in a manner known as such cleaning chemicals or a liquid mixture or a liquid such as water to assist in the cleaning. To spray a cleaning chemical or a liquid as a mist on to the surface of roll lb, preferably in front of cleaning blade 11, the roll cleaning device 10 comprises in connection with the movable carrier 19a, 19b spraying means 21, such as a spraying nozzle, which is attached, for example, in connection with blade holder 15 or dirt collecting trough 17, and flow hoses for the cleaning chemical or liquid (not shown). However, a cleaning chemical can be used advantageously only in cases where there is no risk of the fibrous web being subjected to the effect of the chemical. Such a situation occurs, for example, when there is no fibrous web in a multi-roll calender. In on-line calendering it is not advisable to use any cleaning liquid on account of the risk of mucking up the fibrous web. Removal of dirt especially from a thermo roll with a hard surface is facilitated by a cleaning chemical remaining in a liquid state at the thermo roll's high surface temperature, which chemical is used as a mist sprayed on to the roll surface. The purpose of the cleaning chemical or liquid is to soften the dirt, which has fried firmly to the hot roll surface. After softening, it is easy to clean off the dirt by the roll cleaning device's 10 cleaning blade 11.

Figure 2 shows a roll cleaning device 101 according to a modification of an advantageous embodiment of the invention seen from the end of roll lb. Figure 2 shows a part of a roll stack or a roll stack formed by three superimposed rolls la, lb and lc of a calender, preferably a multi-roll calender. The roll cleaning device 101 is shown beside roll lb on the left side in its cleaning position, wherein the cleaning blade 11 functioning as cleaning means is pressed against the surface of roll lb. The cleaning blade 11 is arranged in Figure 2 above the roll's lb axis of rotation, when the roll's lb surface is moving on the side of cleaning blade 11 from above downwards. In Figure 2, a nip formed in between rolls la and lb and a nip formed in between rolls lb and lc are open and the rolls la and lb do not rotate. Roll lb may be rotated, for ex- ample, by a separate drive, and the roll's lb direction of rotation is indicated by an arrow b similarly as in Figure 1.

Figure 2 shows only one roll cleaning device 101, which as regards its functioning and structure is like the roll cleaning device 10 shown in Figure 1, except that a dirt collecting trough 17 is located also below blade holder 15, where the dirt detaching from the roll's lb surface is directed to drop. Emptying of dirt collecting trough 17 is implemented in a similar manner as with the roll cleaning device 10 of Figure 1, for example, by tilting dirt collecting trough 17 downwards by an actuator 18 around a reversal link 16. The roll cleaning device 101 of Figure 2 is arranged in an inverted position compared with the roll cleaning device 10 of Figure 1. By comparing Figure 1 with Figure 2 it can be seen that the changeability of roll cleaning device 10, 101 into different roll positions both to the left side and to the right side of the stack of rolls la, lb, lc can be implemented by minor structural changes.

The invention has been described above by way of examples and by referring to the figures in the appended drawings. However, the invention is not limited only to that which is presented in the figures, but different embodiments of the invention may vary within the scope of the inventive idea defined in the appended claims.

Claims

1. Roll cleaning device (10, 101) for cleaning a surface or a coating of a roll (la, lb, lc) of a fibrous web machine without removing the roll, which roll cleaning device comprises a cleaning means, which is arranged in a turnable support beam (30) to be placed against the surface of a rotating roll, characterized in that the roll cleaning device (10, 101) comprises a cleaning blade (11), which is adapted to be moved essentially in the axial direction of the roll (la, lb, lc), that is, in a direction deviating by no more than ±10° from the direction of the axis, in order to clean the roll over the entire length of the surface or over an optional distance of the surface length.

2. Roll cleaning device according to claim 1, characterized in that the cleaning blade (11) is adapted to be moved in the direction of a guide bar (20).

3. Roll cleaning device according to claim 2, characterized in that the roll cleaning device (10, 101) comprises a carrier having a top piece (19a) and a bottom piece (19b), that the carrier is bearing-mounted at its top piece to the guide bar (20) and the bottom piece of the carrier is bearing-mounted to the top piece of the carrier to turn with the aid of a reversal link (19c).

4. Roll cleaning device according to claim 3, characterized in that a blade holder (15) is bearing-mounted to the carrier's bottom piece (19b) through a reversal link (16), which reversal link (16) is preferably in a horizontal position.

5. Roll cleaning device according to claim 4, characterized in that a holder (12) is bearing-mounted to the blade holder (15) with the cleaning blade (11) attached to it.

6. Roll cleaning device according to claim 5, characterized in that the blade holder (15) has a joint (13), with which the cleaning blade's (11) holder (12) is bearing- mounted to turn, and that in the blade holder (15) there are adjustable loading devices (14), such as a compressed air bellows or hoses to load the cleaning blade (11) adjustably.

7. Roll cleaning device according to any claim 1 - 6, characterized in that a dirt collecting trough (17) is attached in connection with the cleaning blade (11).

8. Roll cleaning device according to any claim 4 - 6, characterized in that the blade holder (15) and/or the dirt collecting trough (17) is arranged to be turned around the reversal link (16) by an actuator (18), such as a piston-type cylinder actuator.

9. Roll cleaning device according to any claim 2 - 8, characterized in that the guide bar (20) is attached to the support beam (30), which is removably connected and the attachment position of which is in the vertical and horizontal directions adjustable and which is in relation to its pivoted axis (31) turnable.

10. Roll cleaning device according to any claim 2 - 9, characterized in that the cleaning blade's (11) movement in the direction of the guide bar (20) comprises a synchronization with the rotational speed of the roll (lb).

11. Roll cleaning device according to any claim 3 - 10, characterized in that for moving the carrier (19a, 19b) on the guide bar (20) the roll cleaning device (10, 101) comprises a drive, such as an electric motor, and a power transmission, such as a toothed belt transmission.

12. Roll cleaning device according to any claim 1 - 11, characterized in that the cleaning blade (11) comprises a cleaning bevel of a length of less than 1000 mm, preferably a length of 200 mm.

13. Roll cleaning device according to any claim 1 - 12, characterized in that the cleaning blade (11) is more rigid than a doctor blade.

14. Roll cleaning device according to any claim 1 - 13, characterized in that the cleaning blade's (11) angle in relation to a tangent to the surface of the roll (lb) to be cleaned is a blade angle (A), which is adjustable at least with one joint (13, 16, 31) of the roll cleaning device (10) or adjustable by moving the carrier (19a, 19b) with a movement in the x-y direction.

15. Roll cleaning device according to any claim 3 - 14, characterized in that it comprises in connection with the moving carrier (19a, 19b) spraying means (21), such as a spraying nozzle, and flow hoses for spraying a cleaning chemical or a liquid mixture or a liquid such as water on to the surface of the roll (lb).

16. Roll cleaning device according to any preceding claim, characterized in that the roll (la, lb, lc) of the fibrous web machine is a calender roll.

17. Roll cleaning device according to any preceding claim, characterized in that it is adapted for use in an on-line or off-line calender during the run or during creeping operation.

18. Roll cleaning device according to any preceding claim, characterized in that it is adapted for use in the cleaning of a rotating roll of a calender standing idle.

19. Method for cleaning a surface or a coating of a roll (la, lb, lc) of a fibrous web machine without removing the roll by a roll cleaning device (10, 101), which comprises a cleaning means, which is arranged in a turnable support beam (30) to be placed against the surface of the rotating roll, characterized in that the roll cleaning device (10, 101) comprises a cleaning blade (11), which is moved essentially in the axial direction of the roll (la, lb, lc), that is, in a direction deviating by no more than ±10° from the direction of the roll axis, in order to clean the roll surface over the whole length of the surface or over an optional distance of the surface length.

20. Method according to claim 19, characterized in that the cleaning blade (11) is moved in the direction of a guide bar (20).

21. Method according to claim 20, characterized in the roll cleaning device (10, 101) comprises a carrier having a top piece (19a) and a bottom piece (19b), that the carrier is bearing-mounted at its top piece to the guide bar (20) and the bottom piece of the carrier is bearing-mounted to the top piece of the carrier to turn with the aid of a reversal link (19c).

22. Method according to claim 21, characterized in that to the carrier's bottom piece (19b) a blade holder (15) is bearing-mounted through a reversal link (16), which reversal link (16) is preferably in a horizontal position.

23. Method according to claim 22, characterized in that to the blade holder (15) is bearing-mounted a holder (12), to which the cleaning blade (11) is attached.

24. Method according to claim 23, characterized in that the blade holder (15) has a joint (13), with which the holder (12) of the cleaning blade (11) is bearing-mounted to turn, and that the cleaning blade (11) is adjustably loaded by adjustable loading devices (14) located in the blade holder (15), such as a compressed air bellows or a hose.

25. Method according to any claim 19 - 24, characterized in that the material to be removed is collected in a dirt collecting trough (17) attached in connection with the cleaning blade (11).

26. Method according to any claim 22 - 24, characterized in that the blade holder (15) and/or the dirt collecting trough (17) is turned around the reversal link (16) by an actuator (18), such as a piston-type cylinder actuator.

27. Method according to any claim 20 - 26, characterized in that the guide bar (20) is attached to the support beam (30), which is removably connected and the attachment position of which is in the vertical and horizontal directions adjustable and which is in relation to its pivoted axis (31) turnable.

28. Method according to any claim 20 - 27, characterized in that the cleaning blade's (11) movement in the direction of the guide bar (20) is synchronized with the roll's (lb) speed of rotation.

29. Method according to any claim 21 - 28, characterized in that the carrier (19a, 19b) is moved on the guide bar (20) with the aid of the roll cleaning device's (10, 101) drive, such as an electric motor, and with the aid of a power transmission, such as a toothed belt transmission.

30. Method according to any claim 19 - 29, characterized in that the cleaning blade (11) comprises a cleaning bevel of a length of less than 1000 mm, preferably a length of 200 mm.

31. Method according to any claim 19 - 30, characterized in that the cleaning blade (11) is more rigid than a doctor blade.

32. Method according to any claim 19 - 31, characterized in that the cleaning blade's (11) angle in relation to a tangent to the surface of the roll (lb) to be cleaned is a blade angle (A), which is adjusted by at least one of the roll cleaning device's (10) joints (13, 16, 31) or by moving the carrier (19a, 19b) in a motion in the x-y direction.

33. Method according to any claim 21 - 32, characterized in that in connection with the moving earner (19a, 19b) it comprises spraying means (21), such as a spraying nozzle and flow hoses, which can be used for spraying a cleaning chemical or a liquid mixture or a liquid such as water on to the surface of the roll (lb).

34. Method according to any claim 19 - 33, characterized in that the roll (la, lb, lc) of the fibrous web machine is a calender roll.

35. Method according to any claim 19 - 34, characterized in that it is used in an online or off-line calender during the run or during creeping operation.

36. Method according to any claim 19 - 35, characterized in that it is used for cleaning the roll of a calender standing idle.