JPH09192578A - Roll doctor unit - Google Patents

Abstract

(57) An object of the present invention is to more accurately hold a doctor bed accommodating a roll doctor and to enable finer fine adjustment of the doctor bed and the roll doctor. A doctor bed (1) and a roll doctor (2) rotatably housed in the doctor bed about a longitudinal axis are provided, and the roll doctor corresponds to a coating device or a final metering device. A doctor bed holding device 4 for accommodating a doctor bed is provided, which extends over almost the entire width of the coating roller 3, and the doctor bed 1 and the doctor bed holding device 4 are composed of at least two constituent parts. Formed joints 1A, 4A
And the swivel axis 5 of the joint extends parallel to the longitudinal axis of the roll doctor 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll doctor constituting unit used in a coating device or a final metering device, which is rotatable about a doctor bed and a longitudinal axis specific to the doctor bed. A contained roll doctor is provided, the roll doctor extending over substantially the entire width of the coating roller or the counter roller corresponding to the coating device or the final metering device, and-
The present invention relates to a type in which a doctor bed holding device for housing a doctor bed is provided.

[0002]

2. Description of the Related Art A large number of configurations are known for a coating apparatus itself including a roll doctor constituting unit of this type. The liquid or paste medium to be coated is supplied to the coating pressure chamber via the supply passage and is metered and coated via the roll doctor. In the case of so-called direct application, the application medium is applied directly to the running material web from the application device. In this case, the material web is supported by the counter rollers. The material web generally consists of paper, cardboard or fibrous material. In the case of so-called indirect coating, the coating medium is first coated from the coating device onto the surface of the coating roller and subsequently passed from the coating roller onto the material web, for example in a roller nip.

Numerous configurations are also known for the final metering device with a roll doctor construction unit of this type. With such a final metering device, the liquid or pasty medium which has already been applied to the material web (direct application) or the surface of the application roller (indirect application) in advance is finally adjusted. To be measured. In other words, in other words, the roll doctor takes out the excess coating medium and flows it out in the final metering device.

A roll doctor unit used in a coating apparatus is, for example, German Patent Application Publication No. 373.
5889. The doctor bed containing the roll doctor is fixedly arranged at the free end of the knife-shaped base strip. The other end of this base strip is clamped and fixed to a holding device and held by a pressing tube. The second pressing tube, which applies a pressing force to the free end of the base strip, makes a fine adjustment of the angular position of the doctor bed with the roll doctor and a fine adjustment of the pressing force of the roll doctor. At this time, the knife-shaped base strip acts as a flexure spring, and such flexure allows the angle of the free end of the spring to be changed by elastic flexure and thus the angle of the doctor bed with the roll doctor. . Further European Patent Application Publication No. 0541502
In the specification, a roll doctor constituting unit used in a coating apparatus is disclosed. In this known roll doctor constituting unit, a doctor bed provided with a roll doctor is provided with a bending spring formed integrally with the doctor bed. It is clamped and fixed to the holding device.

A roll doctor assembly unit used in a final metering device is disclosed, for example, in GB 2078140. In this known arrangement, the doctor bed is provided with a flexure spring member, which is clamped and fixed to the holding device, so that the free end of the flexure spring member is based on the flexural modulus of the flexure spring member. The angular position and the pressing force of the doctor bed and the roll doctor can be adjusted via a corresponding adjusting device provided on the. Further, in the roll doctor constituting unit used in the final metering device disclosed in British Patent No. 2040738, a doctor bed for accommodating the roll doctor is fixed to the clamp holding device via an integral bending spring protrusion. . The angular position and the pressing force of the doctor bed with the roll doctor are adjusted via the pressure tube by means of the elastic flexure of the flexure spring projection of the doctor bed which is clamped and fixed to the clamp holding device. A further pressing tube is provided inside the doctor bed component, by means of which the flexibly formed doctor bed section is loaded in order to adjust the play of the roll doctor bearing.

In the roll doctor component unit used in the coating device and the final dosing device as described above, in order to enable a more precise and more delicate adjustment of the doctor bed and the roll doctor, It is desirable to more accurately tighten the bed components. In particular, in a folded doctor bed component, chattering marks (Rattermarken) may be generated on the roll doctor and / or the corresponding coating roller or the opposing roller. This is because the folded section of such a doctor bed with the rolled doctor housed rattles tangentially to the coating roller or the counter roller.

[0007]

SUMMARY OF THE INVENTION The object of the invention is to improve a roll doctor assembly unit of the type mentioned at the outset,
It is an object of the present invention to provide a roll doctor constituting unit in which the doctor bed accommodating the roll doctor is held more accurately, and the doctor bed and the roll doctor can be adjusted more delicately.

[0008]

In order to solve this problem, in the arrangement according to the invention, the doctor bed and the doctor bed holding device are connected to each other via a joint formed of at least two components. , The pivot axis of the joint extends parallel to the longitudinal axis of the roll doctor.

[0009]

According to the invention, the doctor bed and the doctor bed holding device are connected to each other via a joint, the pivot axis of which extends parallel to the longitudinal axis of the roll doctor. There is. in this case,
By joint is meant a "real" joint. In other words, it means a joint which consists of at least two components, ie a position-fixed component and a component movable with respect to this component. Joints in which a defined range or defined component movability is only possible via elastic flexures, for example thin-walled parts, or flexure spring devices as described at the outset, are used in the invention. Does not correspond to the concept of.

Thus, in the arrangement according to the invention, there is a precisely defined joint point with a defined fixed pivot point, whereas in the known prior art arrangement a comparison of the entire components is made. Only inaccurate elastic bending is performed. That is, in the arrangement according to the invention, the doctor bed with the roll doctor swivels precisely about a defined swivel axis, which can occur in particular in the known prior art folded doctor bed component "chattering" ( Pattern) is effectively avoided. In this case, the swivel axis is arranged as close as possible to the coating roller or the counter roller when viewed in the radial direction, so that during swiveling of the doctor bed around the swivel axis the direction towards the roller surface of the coating roller or the counter roller or The roll doctor is fed as far as possible in the radial direction away from the roller surface. According to the invention, it is possible to realize a joint formed from at least two components, without the restoring force being applied to the swivel doctor bed. On the other hand, in the case of the conventional arrangement using, for example, a knife-shaped flexure spring, an inevitable varying return force acts on the doctor bed. In contrast, in the arrangement according to the invention, an additional spring element for applying a precisely defined restoring force can be arranged in the joint, if desired.

That is, the arrangement according to the invention provides a much more direct hold than the conventional arrangement, and thus a much smaller tendency to chatter. Due to the fact that the doctor bed can be swiveled around a precisely defined swivel axis and the undesired return force at the joint is eliminated, a doctor bed with a roll doctor is Much more subtly reacts to the adjustment of pressing force. As a result, the control work for adjusting the pressing characteristic for each zone is also reduced.

Due to the fact that a joint formed of two components is provided between the doctor bed and the doctor bed holding device, a simpler construction is also obtained compared to conventional clamp holding devices. This is because, for example, the pressure tube corresponding to the clamp holding device is unnecessary. According to the invention, the pivot axis of the joint can be arranged closer to the surface of the coating roller or of the counter roller in the radial direction, due to structural simplification.
That is, the radial feed direction for the roll doctor can be more easily realized.

In a conventional universal design with folded doctor bed components, the frictional properties between the roll doctor and the material web carried by the coating roller or the counter roller influence the pressing force of the roll doctor. On the other hand, with the configuration of the present invention, the pressing force can be adjusted regardless of the frictional characteristics.

Further, with the configuration of the present invention, the doctor bed can be replaced with another doctor bed without any problem. The exchange doctor bed is configured to accommodate roll doctors with either larger or smaller diameters. The arrangement according to the invention is particularly advantageous for roll doctors having a relatively large diameter. A replaceable doctor bed for accommodating roll doctors with different diameters is, in principle, a utility model no.
No. 10486. Depending on the given structural requirements of the coating device or the final metering device, the format shield, the damming strip and the additional mounting members can additionally be replaced together or adjusted accordingly. . In principle, this is also described in German Utility Model No. 29510486.

The doctor bed is preferably formed in one piece, that is to say in one piece. However, in the arrangement according to the invention, the doctor bed may also consist of two individual components which are connected to one another. In that case, the two individual components as a whole are connected to the doctor bed holding device via a joint formed from at least two components.

In an advantageous configuration of the invention, the joint is formed by two joint halves which fit in and out of each other in a cross-sectional profile, one of the two joint halves being: It is formed integrally with the doctor bed and the other half of the joint is formed integrally with the doctor bed holding device. In other words, in other words
The doctor bed and the doctor bed holding device have both components engaging inwardly and outwardly with each other in a form-fitting manner at a joint point,
At this time, the doctor beds are structurally harmonized with each other such that they can be swung relative to a positionally fixed doctor bed holding device relative to a fixed swivel axis. Both joint halves advantageously have a cross-sectional profile in the form of an arc section at the joint.

In a further advantageous development of the invention, the joint is hinged. In this case, the joint advantageously has a plurality of projections and a plurality of notches which engage one another inside and outside in the form of a comb. The projection is provided with a through-opening in the direction of the swivel axis, and at least one pin is guided through the through-opening of the projection that engages with each other in and out. The doctor bed and the doctor bed holding device are each formed with a plurality of projections and notches. In that case, the projections of the doctor bed mesh with the corresponding notches provided in the doctor bed holding device in the form of teeth, and the projections of the doctor bed holding device form the teeth in the corresponding notches provided in the doctor bed. Mesh with each other. That is, the doctor bed has protrusions and notches alternately, and the doctor bed holding device has protrusions and notches alternately corresponding to the protrusions and notches of the doctor bed. In this case, one of the components, that is to say the projection of the doctor bed or the doctor bed holding device, corresponds respectively to the corresponding notch of the other component, ie the doctor bed holding device or the doctor bed. A hinge joint is formed between the doctor bed and the doctor bed holding device, by virtue of the fact that the two parts engaging in and out of one another are connected to one another via a coherently extending pin or a plurality of section pins. . That is, in such a configuration,
The joint is made up of three components.

In all of the configurations described above, the doctor bed and / or the doctor bed holding device can optionally be interrupted in sections, that is to say formed of several sections in the longitudinal extension direction. You may

In a further advantageous refinement of the invention, the pivot axis of the joint is arranged in front of the roll doctor, on the entry side in the direction of rotation of the corresponding coating roller or of the counter roller. ing. In other words, the doctor bed is held in a "drag" arrangement with respect to the material web running beside it or the coating roller rotating beside it. Such an arrangement form is advantageous when avoiding "chattering marks". However, if desired, the swivel axes of the joints may be spaced behind the roll doctor on the running side in the direction of rotation of the corresponding coated or counter roller.

In a further advantageous configuration of the invention, the doctor bed corresponds to a pressing tube, the pressing force of the pressing tube being adjustable zone by zone by means of an adjusting device. In this case, the acting direction of the pressing force applied to the doctor bed by the pressing tube is directed substantially in the radial direction with respect to the coating roller or the facing roller, and passes through the central axis of the roll doctor housed in the doctor bed. It is extended. That is, the pressing force acts on the center of the roll doctor to press the roll doctor radially against the roller surface, in which case the pressing force exerted on the roll doctor can be adjusted zone by zone over the width of the roller. Numerous configurations are known for suitable adjusting devices for varying the pressing force of a pressing tube. Advantageously, the adjusting device is incorporated in an automatic control circuit, which controls the adjustment of the pressing force on a segment-by-section basis on the basis of a measurement of the quality of the coating medium to be coated. Optimal fine adjustment of the pressing characteristics is realized on the basis of the pressing force acting on the center of the roll doctor in the radial direction with respect to the roller surface. On the other hand, in the conventional configuration, the pressing force applied to the doctor bed has a component tangential to the roller surface.

In a further advantageous configuration of the invention, the adjusting device for adjusting the pressing force applied to the roll doctor on a zone-by-zone basis comprises a diverting device, which is introduced via the diverting device. The adjusted movement thus made is diverted in the direction of action of the pressing force. In this case, the deflection device is expediently designed as a worm gear. That is, in order to adjust the pressing force zone by zone, one worm transmission corresponds to each adjusting section, corresponding to the number of adjusting sections provided over the roller width of the adjusting apparatus. In this way, the adjusting movement can be introduced zone by zone or segment by zone at a predetermined angle with respect to the direction of action of the pressing force. The introduction of the adjusting movement is preferably carried out via the adjusting spindle. The adjusting spindle can be operated via an automatic operating device, for example an actuating motor, or can be operated manually. On the output side of the worm gear,
It is advantageous if the adjusting movement is realized via a spindle screw. The spindle screw cooperates with the moving member via threaded engagement. This moving member acts directly on the pressure tube.

In a further advantageous development of the invention, a second pressure tube corresponds to the free end of the doctor bed, that is to say in the area of the doctor bed opposite the joint. The pressing force of the second pressing tube can be adjusted. The direction of the pressing force applied to the doctor bed by the second pressing tube extends substantially in the radial direction with respect to the coating roller or the facing roller, and extends laterally of the diameter of the roll doctor on the side of the free end of the doctor bed. ing. Due to the fact that such a loaded free end range of the doctor bed is appropriately bent and flexible, i.e., for example, a thin section is formed, this free end range is related to the applied pressing force. By elastically swiveling around the thin portion to various extents, the bearing of the roll doctor is closed more firmly or the bearing is opened wider. This allows the bearing play of the roll doctor to be adjusted directly on the doctor bed. According to the invention, because the action direction of the pressing force is set in the radial direction with respect to the roller, a desired tangential force component with respect to the doctor bed is not generated, but only the radial force component, and thus the Only a turning moment around the thin part is generated.

The doctor bed with the roll doctor is preferably arranged in the range of approximately 2 o'clock to 8 o'clock of the corresponding coating roller or counter roller.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

The illustrated embodiment of the roll doctor construction unit according to the invention is part of a coating apparatus. This coating device functions, for example, to coat the roller surface 3A of the coating roller 3 with a liquid or paste medium. In such a so-called indirect coating method, a liquid or paste-like medium continues to be in a known manner and the surface 3A of the coating roller 3 is
In a roller nip to a traveling material web, eg a paper web (not shown). Other components belonging to the coating device together with the roll doctor component unit are not shown for the sake of clarity of the drawing,
Alternatively, it is only shown schematically in the form of the front wall 17. This front wall 17 partitions the supply gap 16.
Through the supply gap 16, the liquid or paste medium to be coated is supplied to the coating chamber (see arrow).
The damming strips provided on the upper end of the front wall 17 as seen in the drawing and partitioning the coating chamber with the roll doctor construction unit and the roller surface 3A are not shown.

The roll doctor constituting unit comprises a doctor bed 1 and a roll doctor 2 housed in the doctor bed 1.
And a doctor bed holding device 4. further,
The first pressing tube 7, the adjusting devices 9 to 14 belonging to the first pressing tube 7, and the second pressing tube 8 capable of adjusting the pressing force are provided.

The roll doctor 2 extends over substantially the entire width of the coating roller 3 and is accommodated in a corresponding notch or bearing opening 18 provided in the doctor bed 1, in which case the roll doctor 2 has its longitudinal axis. It can rotate around. A joint half portion 1A is formed integrally with the doctor bed 1. This joint half 1A engages with a corresponding joint half 4A integrally formed with the doctor bed holding device 4. In the two contact surface pairs formed between the joint halves 1A and 4A, the outer cross-sectional contours of the joint halves are each formed in an arc shape. Both joint halves 1A, 4A
The swivel axis of the joint formed from is designated by the reference numeral 5, which swivel axis 5 extends parallel to the longitudinal axis of the roll doctor 2.

The dashed line shows a roll doctor 2'having a relatively large diameter. Such a roll doctor 2'can be inserted into a replacement doctor bed (not shown) with a relatively large bearing opening 18 '. The shape of such a replacement doctor bed, apart from the relatively large bearing opening 18 ', corresponds substantially to the shape of the illustrated doctor bed 1. Thus, even such a replacement doctor bed for a roll doctor 2'having a relatively large diameter is provided via the associated joint half 1A with a corresponding joint half 4 provided on the doctor bed holding device 4.
Can be inserted into A. Due to the fact that the shape of the entire exchange doctor bed has hardly changed, the adjusting device and the pressure tubes 7, 8 described below are also ready to function without additional measures after the exchange of the doctor bed. That is, due to the relatively large diameter of the roll doctor 2 ', it is only necessary to adjust the distance between the roll doctor constituting unit and the roller surface 3A of the coating roller 3 at the time of replacement.

The doctor bed holding device 4 includes an adjusting device 9
~ 14 are incorporated. This adjusting device works to finely adjust the pressing force and angular position of the doctor bed 1 and the roll doctor 2 housed in the doctor bed 1 against the roller surface 3A of the coating roller 3 for each zone.

A number of adjusting spindles 11 are provided across the width of the coating roller 3. These adjusting spindles 11 are operated in this embodiment via a handle wheel 14. The actuation of the adjusting spindle 11 can also be carried out via an automatic actuating member, for example an actuating motor, which rotates the adjusting spindle 11 as desired. The free end of each adjusting spindle 11 carries a worm 13 (indicated by a broken line), which worm 13 meshes with the worm gear 12. This worm gear 12 follows a coaxial spindle screw 10, which is screwed onto the moving member 9 via a thread. The moving member 9 is axially movably supported in a guide provided in the doctor bed holding device 4. The first pressing tube 7 is inserted in the upper region of the moving member 9 as seen in FIG. The longitudinal axis of the spindle screw 10 or the longitudinal axis of the worm gear 12 forms an angle of 90 ° with the longitudinal axis of the adjusting spindle 11 in this embodiment.

Therefore, by means of the worm transmission formed by the worm 13 and the worm gear 12, the introduction direction of the adjustment movement of the adjustment spindle 11 is changed by 90 ° in the direction of the line of action of the pressing force applied to the roll doctor 2. To be done. This pressing force is transmitted from the moving member 9 to the roll doctor 2 via the first pressing tube 7 and the doctor bed 1. The direction of action of the pressing force is indicated by the arrow 19 written in the area of the first pressing tube 7. This pressing force passes through the central axis 15 of the roll doctor 2 and acts radially toward the roller surface 3A. That is, the pressing force of the roller doctor 2 can be adjusted for each zone or each section by operating the plurality of adjusting spindles 11 distributed over the entire width of the coating roller 3. In this case, the pressing force acts on the center of the roll doctor 2. The undesired force component tangential to the roller surface applied to the roller doctor 2 or the doctor bed 1 is avoided on the basis of such a configuration, so that "chattering" of the roll doctor 2 is sufficiently prevented. can do.

The second pressing tube 8 housed in the doctor bed holding device 4 and extending over substantially the entire length of the roll doctor 2 can adjust the pressing force. The section 1B of the doctor bed 1, which is located opposite the second pressing tube 8, is connected to the rest of the doctor bed body via a thinned portion 1C. The second pressing tube 8 presses the section 1B of the doctor bed 1. The line of action of the pressing force is the arrow 2 written in the range of the second pressing tube 8.
It extends in the direction of 0. Therefore, the acting direction 20 of the pressing force extends substantially in the radial direction with respect to the roller surface 3A of the coating roller 3, and the acting line of the acting direction 20 is outside the outer dimension of the roll doctor 2, that is, beside the diameter of the roll doctor 2. , Laterally spaced. Based on the pressing force of the second pressing tube 8, the turning moment of the section 1B of the doctor bed 1 centering on the thin portion 1C is generated. As a result, the section 1B is pressed against the roll doctor 2 to varying degrees in response to the adjusted pressing force, and thus the bearing opening 18 provided in the doctor bed 1 is closed more tightly to surround the doll doctor 2 or It will be expanded a little. In this way, the bearing play of the roll doctor 2 is adjusted. Due to the fact that the direction of action 20 of the pressing force on the roller surface 3A of the coating roller 3 is oriented radially, undesired tangential components to the doctor bed 1 are avoided.

In the illustrated embodiment, the doctor bed 1 is supported with the roll doctor 2 housed in the doctor bed 1 in a "drag" arrangement. This is because the swivel axis 5 of the joint consisting of the joint halves 1A, 4A is arranged at a distance in front of the roll doctor 2 on the running side of the coating roller 3 as seen in the rotation direction 6 of the coating roller 3. Because. In this case, the swivel axis 5 is arranged relatively close to the roller surface 3A of the coating roller 3. That is, the doctor bed 1 with the turning axis 5 as the center
The relatively small swiveling movement of A causes a substantially radial feed movement relative to the roller surface 3A. Due to the two joint halves 1A, 4A which slide on top of each other or in engagement with each other without return force, a very fine adjustment of the doctor bed 1 and the roll doctor 2 housed in the doctor bed 1 is obtained. . If the doctor bed is to be replaced in order to use a replacement doctor bed with roll doctors of varying diameter, the joint half 1A of the doctor bed 1 is removed from the corresponding joint half 4A of the doctor bed holding device 4. Until it is possible to do so, it is only necessary for the doctor bed 1 to be swiveled to the left as seen in the drawing about the swivel axis 5 of the joint. That is, the installation or removal of the doctor bed, including the roll doctor, is quick and hassle-free, and does not require the clamping or disengaging of the clamping element or another fixing element as required in the known prior art. The section 1D formed at the free end of the doctor bed 1 is pulled down so as to cover the doctor bed holding device 4, in which case the doctor bed 1 is associated with the two pressing tubes 7, 8 located below it. Acts as a cover to cover the adjuster of. In this way, these components are prevented from being contaminated by the flowing liquid or pasty medium.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention.

[Explanation of symbols]

1 doctor bed, 1A joint half, 1B
Division, 1C thin section, 1D division, 2, 2 '
Roll doctor, 3 coating roller, 3A roller surface, 4 doctor bed holding device, 4A joint half, 5 swivel axis, 6 rotation direction, 7 first pressing tube, 8 second pressing tube, 9 moving member, 10 spindle Screw, 11 adjusting spindle, 12 worm gear, 13 worm, 14
Steering wheel, 15 center axis, 16 supply gap,
17 front wall, 18, 18 'bearing opening, 19 working direction, 20 working direction

Claims (9)

[Claims] 1. A roll doctor constituting unit for use in a coating device or a final metering device, comprising: a doctor bed (1) and rotatable about a longitudinal axis specific to the doctor bed (1). The roll doctor (2) accommodated therein is provided, and the roll doctor (2) is
Extending over substantially the entire width of the coating roller (3) or of the counter-roller corresponding to the coating device or the final metering device—further, a doctor bed holding device (4) for accommodating the doctor bed (1) In the type provided with, the doctor bed (1) and the doctor bed holding device (4) are coupled to each other via a joint (1A, 4A) formed of at least two components, Roll doctor component unit, characterized in that the swivel axis (5) of the joint extends parallel to the longitudinal axis of the roll doctor (2). 2. The joint is formed from two joint halves (1A, 4A) which fit in and out of each other in a cross-sectional contour, one joint half (1A) of the two joint halves being provided. Is formed integrally with the doctor bed (1) and the other joint half (4A) is formed integrally with the doctor bed holding device (4). 3. The roll doctor constituting unit according to claim 1, wherein the joint is formed in a hinge shape. 4. The joint has a plurality of protrusions and a plurality of notches that engage with each other inside and outside in a comb shape, and the protrusion has a through opening in a direction of a pivot axis of the joint. , At least one pin is guided through a through-opening of said projections engaging inwardly and outwardly with each other,
Moreover, the roll doctor constituting unit according to claim 3, wherein the projection and the notch that are fitted to each other are integrally formed on the doctor bed and the doctor bed holding device. 5. The rolling axis (5) of the joint (1A, 4A) is on the run-in side as seen in the direction of rotation (6) of the corresponding coated roller (3) or of the corresponding roller, on the roll doctor (2) side. Claim 1 arranged with a space in front.
4. The roll doctor constituting unit according to any one of 1 to 4. 6. A pressing tube (7) corresponds to the doctor bed (1), and the pressing force of the pressing tube (7) can be adjusted for each zone by an adjusting device (9-14). The acting direction (19) of the pressing force applied to the doctor bed (1) by the pressing tube (7) is accommodated in the doctor bed (1) in a substantially radial direction with respect to the coating roller (3) or the opposing roller. Roll doctor assembly unit according to any one of claims 1 to 5, which extends through the central axis (15) of the roll doctor (2). 7. The adjusting device (9-14) has a deflecting device (12, 13) through which the adjusting movement introduced introduces a direction of action of the pressing force. The roll doctor constituting unit according to claim 6, which is convertible to 19). 8. The diverting device is a worm transmission (1)
8. The roll doctor construction unit according to claim 7, which is embodied as 2, 2. 9. A second pressing tube (8) corresponds to a free end (1B) of the doctor bed (1) opposite to the pivot axis (5) of the joints (1A, 4A). The pressing force of the second pressing tube (8) is adjustable, and the acting direction (20) of the pressing force applied to the doctor bed (1) by the second pressing tube (8).
Roll doctor assembly unit according to any one of the preceding claims, which extends outside the diameter of the roll doctor (2) in a substantially radial direction with respect to the coating roller (3) or the counter roller.