Method and arrangement in a drive device of a rod coating station

#This invention relates to a method using the drive device of a rod coating station, in which the drive device includes at least a telescopic articulated shaft, at the first end of which is a replaceable grooved rod and at the opposite end of which is the shaft of the drive motor, and in which the rotation of the rod creates an axial force, which is cancelled out by a counterforce brought to the end of the rod at the articulated shaft side. In addition, the invention relates to an arrangement for implementing the method.

#U.S. Pat. Nos. 4,889,093 and 5,383,968 disclose rod coating devices suitable for the surface sizing and coating of paper. FIG. 2 of the latter publication shows that, in the device, the coating rod is set in a cradle, which is loaded and pressed shut with the aid of its own loading hoses. The loading hoses are supported on a unified profile rib, which is in turn supported at selected intervals on profiling spindles.

#At the rod coating station, the grooved rod set in the cradle is rotated from its end by a special drive device, so that it regulates precisely, in a known manner, the amount of the coating, sizing, or similar substance to be spread on the surface of the wet web.

#In the drawings:

#FIG. 1 shows a general schematic diagram of a rod coating device;

#FIG. 2 shows a first embodiment of the invention, in partial cross-section;

#Referring now to the drawings in detail, the invention deals with a rotating spreader rod drive device, which is used, for example, in a rod coating device suitable for the sizing or coating of paper. As such, the method and arrangement according to the invention can, however, be applied to different kinds of rod spreading devices.

#FIG. 1 shows one modern rod coating device 10. In this connection, reference can also be made generally to sizing, because what is in question is a thin layer (for example, 1-2 g/m2, the solids content of the size being typically 8-10%).

#The device 10 is to a great extent of the same type as that of the U.S. Pat. No. 5,383,968 referred to in the description of the state of the art. However, the cradle 11 of the rod 12 is attached by means of a quick attachment 11.1 to the frame 28 of the device 10. The profile rib 14 is adjusted to the desired profile using hand-wheels 15. The loading hose 13 pushes the cradle 11 towards the web supported by a roll (not shown). The rod 12 protrudes from the cradle 11 at least at one end, to which the drive device is connected. The rod's diameter can be, for example, about 10 mm and its rotation speed about 60 rpm.