Abstract:
The invention concerns a storage box A 0 ( 10 ) for doctor blades employed in servicing of the face of a roll in a paper/board machine. The box is a polygon construction, in whose interior the reel (R) formed by doctor blades (t 1 , t 2 ) has been fitted. Through an opening ( 11 ) in a side face of the storage box, the doctor blades (t 1 , t 2 , . . . ) can be discharged from the reel (R) placed inside the storage box ( 10 ). In its interior, the storage box ( 10 ) comprises bearing means, preferably at least one separate disk ( 10   a   3 ′), which has been fitted to revolve freely on the side face of the reel (R) formed by the doctor blades.

Description:
FIELD OF THE INVENTION 
     The invention concerns a storage box for doctor blades employed in servicing of the face of a roll in a paper/board machine. 
     BACKGROUND OF THE INVENTION 
     In prior-art solutions, the doctor blades have been stored in paper mills as straight blades in storage shelves for doctor blades. In such a case, there is a risk that a blade that is constantly exposed is damaged. Even a small dent in the blade face makes the blade unusable. 
     OBJECTS AND SUMMARY OF THE INVENTION 
     In the present patent application, an entirely novel solution for storage of blades is suggested. In the present patent application, it is suggested that a storage box be used for doctor blades. The doctor blades have been joined together from their ends, and the blades have been wound onto a reel. Said reel of doctor blades has been inserted into a storage box, and the doctor blades can be taken/pulled out of said storage box by unwinding the reel of doctor blades. 
     In accordance with the present invention, the storage box consists of two parts: a cover part and a bottom part. The cover part is fitted so that the edges of the cover are placed around the edges of the bottom part. The box is favourably of octagonal shape. According to the invention, separate bearing means which promote the rotation of the reel of doctor blades have been fitted inside the cover part and the bottom part of the box. Since the storage box is favourably made of cardboard, the bearing part has preferably also been made of cardboard. The bearing means preferably comprise two circular disks, against which the side faces of the reel R of doctor blades are placed. One of the circular disks has been fitted freely against one side face of the reel of doctor blades, and the other disk against the other side face. Further, one of the circular disks has been fitted to be placed against a backup bearing part, which is also made of cardboard. Favourably, both faces of both of the circular disks have been treated with a coating which reduces the friction. The coated bearing face of the circular disk is placed against a preferably likewise coated backup bearing face. One preferably silicon-coated backup bearing face for the circular disk  10   a   3 ′ is the plane face of a backup bearing part  10   a   3 ″, and a second preferably silicon-coated backup bearing face for the other circular disk  10   a   30 ′ is the inside plane face of the bottom part  10   a   1 . 
     The backup bearing part  10   a   3 ″ has been formed out of an octagonal plate so that the fold parts of the plate have been bent into an angle of 90° against the bottom face of the middle area of the plate. Said folded edges form a bearing face at the outer circumference of the reel R of doctor blades. Thus, the friction between the side face of the reel of doctor blades and the outer circumference is reduced. The other circular disk  10   a   30 ′ has been fitted between the other side face of the reel R of doctor blades and the inner face of the bottom  10   a   1 . 
     Thus, the storage box is provided with inside bearing means, which permit easy rotation of the reel of doctor blades and easy discharge of the reel, i.e. easy pulling of blades out of the interior of the box. The box operates all the time as a storage box until the last doctor blade has been pulled out of the interior of the box. 
     The storage box in accordance with the invention for doctor blades is characterized in what is stated in the patent claims. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention will be described in the following with reference to some preferred embodiments of the invention illustrated in the figures in the accompanying drawings, the invention being, yet, not supposed to be confined to said embodiments alone. 
     FIG. 1A shows a storage box  10  in accordance with the invention for doctor blades as assembled. In its interior the storage box  10  includes a reel R composed of doctor blades t 1 , t 2  . . . , which can be discharged through an opening provided in the side face of the storage box. 
     FIG. 1B illustrates a reel R of doctor blades consisting of doctor blades t 1 , t 2 . 
     FIG. 1C is an exploded view of a storage box for doctor blades. 
     FIG. 2A shows the bottom/cover part of the storage box as spread out. 
     FIG. 2B illustrates folding of the edges of the bottom/cover part along the creases so that the edge parts are formed perpendicularly to the middle area while the edge parts are locked in slots placed at the edges of the middle area. 
     FIG. 2C shows the second stage of folding, i.e. interlocking of adjacent edge parts with each other. 
     FIG. 3A illustrates formation of the bearing part out of two jointly operative structural components. The illustration in the figure is an axonometric view in part. 
     FIG. 3B is a spread-out illustration of a backup bearing part. 
     FIG. 3C illustrates folding of the edges of the backup bearing part perpendicularly to the middle area in order to form the edge portion of the bearing arrangement. 
     FIG. 3D shows a bearing part, favourably a circular disk. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     FIG. 1A is an axonometric view of a storage box  10  in accordance with the invention. The storage box  10  is favourably octagonal, and the material is corrugated board, cardboard, relatively stiff plastic, or equivalent. As is shown in the figure, the reel R of doctor blades can be discharged out of the storage box  10  through the discharge opening  11 . 
     FIG. 1B is an illustration of principle of formation of a reel R of doctor blades so that the doctor blades t 1 , t 2  . . . are joined together by means of a binding strap from their ends while the blade ends overlap each other. 
     FIG. 1C shows the storage box  10  as disassembled into its parts  10   a   1 ,  10   a   2  and  10   a   3 . The storage box  10  comprises a bottom part  10   a   1 , a cover part  10   a   2 , and bearing means  10   a   3  placed in the interior of the box, which bearing means consist of a first bearing disk  10   a   3 ′, preferably a circular disk, and of a backup bearing part  10   a   3 ″, and of a second bearing disk  10   a   30 ′, preferably a circular disk. The disk faces of both circular disks  10   a   3 ′,  10   a   30 ′ have been coated with a material that reduces friction, favourably silicon. Similarly, the face planes of the backup bearing part  10   a   3 ″ and of the bottom part  10   a   1 , against which the circular disks  10   a   3 ′,  10   a   30 ′ will be placed, have been coated with a material that reduces friction, favourably silicon. As is shown in the figure, the storage box  10  is favourably octagonal, and so it can be placed readily on support of one of its side faces, in which case the doctor blades can be discharged from the reel R of doctor blades placed in the interior of the box through the through opening  11  provided in the side face of the storage box. The through openings  11  are placed in the same locations one above the other in the parts  10   a   2 ,  10   a   1  and  10   a   3 ″, so that the doctor blades t 1 , t 2  . . . can be discharged from the reel R through the openings  11  provided in the parts  10   a   2 ,  10   a   1  and  10   a   3 ″ of the storage box  10 . 
     FIG. 2A is a spread-out illustration of the bottom part  10   a   1  and the cover part  10   a   2  of the storage box. The bottom part  10   a   1  and the cover part  10   a   2  comprise eight edge parts, i.e. the edge parts P 1 , P 2 , P 3 , P 4 , P 5 , P 6 , P 7 , and P 8 . The edge parts are provided with creases D 1 , D 2 , D 3  . . . D 8 . The fold lines of the creases D 1 , D 2 , D 3  . . . D 8 ; D 2 ′, D 4 ′ . . . D 8 ′ form an octagon when the spread-out illustration of the part is viewed from above. At the edges of the bottom area e of the box, in connection with every second edge part P 2 , P 4 , P 6  . . . , there are corresponding slots f 1 , f 2 , and the fold edge P 2 ′ connected with the edge part P 2  related to said slots f 1 , f 2  . . . can be folded so that the locking tongues c 1 , c 2  . . . connected with said fold edge are inserted in the slots f 1 , f 2 . 
     When the box is assembled, the edge parts P 1 , P 2  . . . P 8  are raised so that they are perpendicular to the face plane of the bottom area e. Every second edge part P 1 , P 3  is folded so that, for example, the ends P 1a , P 3a  . . . , which are inclined in relation to the directions or lines of the creases D 1 , D 3 , are placed between the edge parts P 2 , P 2 ′; P 4 , P 4 ′ . . . of the adjacent edge sectors. The edge tongues c 1 , c 2  of the fold edge P 2 ′ are locked in the corresponding slots f 1 , f 2  in the middle part e. The inclined end P 1A  of the edge part P 1  is locked between the edge parts P 2 , P 2 ′. 
     FIG. 2B illustrates the formation of the bottom part  10   a   1 , and so also of the cover part  10   a   2 , of the storage box  10  for doctor blades so that the edge parts P 1 , P 2 , P 2 ′ are folded in the way described above so that the edge tongues c 1 , c 2  of the edge parts P 2 ′ are fitted into the corresponding slots f 1 , f 2  in the bottom area e. The construction of the cover part  10   a   2  is equal to the construction of the bottom part  10   a   1 . The cover part  10   a   2  has larger measures than the part  10   a   1 , and so the cover part  10   a   2  is fitted around the bottom part  10   a   1 . 
     FIG. 2C illustrates the part  10   a   1 ,  10   a   2  as folded together, i.e. the ultimate stage of folding following after the stage shown in FIG.  2 B. 
     FIG. 3A illustrates formation of the bearing part  10   a ′ 3 . The bearing part  10   a   3  comprises a bearing part  10   a   3 ′, which is placed against the backup bearing part  10   a   3 ″. The part  10   a   3 ′ is a circular disk, whose outer face is provided with a coating, preferably a silicon coating, which reduces the friction. The outer face of the circular disk  10   a   3 ′ enters into contact with the backup bearing face N of the backup bearing part  10   a   3 ″. Said face N has also been treated favourably with a material that reduces friction, preferably provided with a coating, preferably a silicon coating. 
     FIG. 3B is a spread-out illustration of the part  10   a   3 ″. The part  10   a   3 ″ is likewise made of an octagonal construction, and it comprises eight edge parts M 1 , M 2 , M 3  . . . M 8 . The edge parts M 1  . . . M 8  are placed at the outer edge of the middle area e 2  of the plate part  10   a   3 ″, and they are provided with creases or crease lines n 1 , n 2  . . . n 8 . The edge part M 1 , M 2  . . . is provided with end edges i, which are placed perpendicularly to the creases n 1 , n 2  . . . , and with second end edges i′, which are placed as inclined in relation to said crease lines n 1 , n 2  . . . . 
     As is shown in FIG. 3C, the edge parts M 1 , M 2  . . . of the part  10   a   3 ″ are folded so that they are perpendicular to the plane of the middle area e 2 , in which case, for example, the inclined end edge i′ of the edge part M 1  is placed underneath the end edge i of the adjacent edge part M 8 . 
     FIG. 3D shows the bearing disk  10   a   3 ′ or  10   a   30 ′ as a separate illustration.