Doctor blade bar assembly
AssigneeKoenig & Bauer Aktiengesellschaft
InventorsWolfgang O. Reder, Georg Schneider
Life of this patent
Estimating the term…
Abstract
A sector blade bar assembly supports spaced doctor blades on slidable base bodies which can be moved to throw-on or adjust the doctor blades with respect to a screened ink roller. A pair of blade base shifting devices are secured to doctor blade base support beams. The shifting devices utilize fluid actuated pistons to move the base bodies along guide surfaces on the beams. The doctor blades are moved in a linear manner to engage the screened ink roller at a negative contact angle. End plates on the base bodies are slidably supported and are spring biased into contact with the screened ink roller when the doctor blades are thrown onto the screened ink roller.
Claims9
A doctor blade bar assembly for a short inking unit of a web-fed rotary printing press having a screened ink roller, said doctor blade bar assembly comprising:
- a screened ink roller having a surface and being supported for rotation about an axis of rotation in a first direction;
- a doctor blade base body supported for sliding movement with respect to said screened ink roller;
- first and second spaced, generally planar doctor blades supported at first ends by said doctor blade base body, said first and second doctor blades each having a doctoring edge which is engageable with said surface of said screened ink roller;
- doctor blade base support means for supporting said doctor blade base body for sliding movement;
- and
- means to move said doctor blade base body to shift said first and second doctor blades along first and second straight lines defined by said planar first and second doctor blades into contact with said surface of said screened ink roller at a negative contact angle.
A doctor blade bar assembly for a short inking unit of a web-fed rotary printing press having a screened ink roller, said doctor blade bar assembly comprising:
- a screened ink roller having a surface and being supported for rotation about an axis of rotation in a first direction;
- a doctor blade base body;
- first and second generally planar spaced doctor blades supported at first ends by said doctor blade base body, said first and second doctor blades each having a doctoring edge which is engageable with said surface of said screened ink roller, said first and second doctor blades extending from said doctor blade base body toward said surface of said screened ink roller along first and second straight lines defined by planes of said first and second planar doctor blades, said first and second straight lines intersecting said surface of said screened ink roller at first and second points of contact at first and second tangent lines at said first and second points of contact;
- first and second spaced doctor blade base support beams for supporting said doctor blade base body for sliding movement;
- and
- means to move said doctor blade base body to shift said first and second doctor blades along said first and second straight lines into contact with said surface of said screened ink roller at said first and second negative contact angles.
Dependencies are inferred from the claim text.