Paper making and fiber liberation – Apparatus – Web creping or crinkling type
Patent
1992-01-31
1994-01-18
Hastings, Karen M.
Paper making and fiber liberation
Apparatus
Web creping or crinkling type
1525651, D21G 300
Patent
active
052797104
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
Technical Field
This invention relates to a structure for supporting a doctor blade used for permitting a raw material to be satisfactorily accumulated on a paper making roll and water to be satisfactorily fed to the roll and removing foreign matters adhered to a surface of the roll such as paper powders, pitch, tailings or the like from the roll to keep it clean, and more particularly to a doctor blade supporting structure adapted to permit a pressure distributed at an edge of the blade pressedly contacted with the roll to be adjusted so as to be substantially uniform.
Background Art
A conventional doctor blade supporting structure which has been known in the art includes an adjusting means which acts to permit a blade for peeling off dusts adhered to a surface of a roll from the roll to be contacted at a tip end thereof with the roll surface at a uniform linear pressure or a contact pressure of the blade uniformly distributed in an axial direction of the roll.
In general, a blade for a doctor blade supporting structure is required to exhibit satisfactory holding force, stability and flexibility; therefore, the blade for the conventional doctor blade supporting structure is generally made of a relatively thin sheet material such as metal, plastic or the like into any desired thickness depending upon applications thereof. Unfortunately, this causes the blade to be pivotally moved with respect to the roll, resulting in the contact pressure of the blade being apt to be varied. In view of such a problem, a structure as shown in FIG. 7 is proposed and used, wherein a blade (G) is vertically interposed between a blade holder (F) made of a relatively rigid plate material and support members (C) and the blade holder (F) keeps the blade (G) at a posture. The support members (C) each are held directly on a doctor bag (E) using a screw means or pivotally supported on a pivot rod (D). Then, the blade (G) is vertically moved through a pressurized air tube (A) and an open tube (B) each interposedly arranged between the doctor bag (E) and the support member (C) to adjust a position of the blade (G).
The blade holder (F) comprises a single plate member formed into a shape of continuously extending in an axial direction of a roll, to thereby prevent a contact pressure of the blade (G) with respect to the roll from being varied in use. However, in order that the contact pressure of the blade (G) can be uniformly distributed in the axial direction of the roll, it is necessary to uniformly adjust contact between a surface of the roll and the blade (G). Unfortunately, this needs a considerable amount of labor. Further, a width of the blade holder (F) is finished by machining, however, a thickness of a blank for the blade holder (F) and its length are used as those of the holder (F) without being subject to finishing by machining, resulting in failing to form a contact end between the blade holder (F) and the blade (G) with high accuracy.
It would be considered that the accuracy of the contact end is increased by various processing techniques. However, this requires a considerable amount of labor and time and many processing machines, leading to a significant increase in manufacturing costs.
In view of the foregoing, the present situation is to escape an error occurring at the contact end utilizing crook of the blade holder (F); however, in order to accomplish the purpose, it is required to reduce a degree of crook of the blade holder (F) when the doctor blade supporting structure is directed to applications wherein the blade (G) is abutted against the roll at a high pressure, resulting in a relief being lost. This requires to further increase the accuracy of the contact end, so that it is highly difficult to press the blade against the roll at a constant linear pressure.
DISCLOSURE OF INVENTION
In accordance with the present invention, a doctor blade supporting structure is provided which comprises a blade (1) abutted against a roll (R), a blade holder (2) and support members (4), wherein the blade is mo
REFERENCES:
patent: 2477339 (1945-02-01), Ljungquist
patent: 3085275 (1961-04-01), Allison
patent: 3112767 (1964-03-01), Carvillo
patent: 3649991 (1972-03-01), Grimston et al.
patent: 3778861 (1973-12-01), Goodnow
patent: 4789432 (1988-12-01), Goodnow et al.
Aikawa Iron Works Co., Ltd.
Hastings Karen M.
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