Doctor blade assembly
AssigneeMark R. Atkins
InventorMark R. Atkins
Life of this patent
Estimating the term…
Abstract
“Ghosting” and leakage problems in a doctor blade assembly are minimized or eliminated in a construction that includes a reservoir (10) partially surrounding a transfer roller (12) wherein a surface of the roller (12) is within the reservoir (10) for at least 180° of its rotation. The reservoir (10) is desirably split into two segments (50), (52) which are mounted for relative movement so as to allow access to the interior of the reservoir (10) as well as to the roll (12). Chambered end plates (82), (84) house seals (10) and receive parts (144) of the ends of doctor blades (40), (42) which extend past the end (142) of the roll (112) to promote good sealing at the ends of the assembly.
Claims8
An enclosed chambered doctor blade assembly comprising:
- a generally cylindrical roll mounted for rotation about an axis;
- a chamber partially surrounding said roll and being generally C-shaped in cross section to define an opening having ends connected by spaced sides to define an opening extending parallel to said axis through which the roll is accessible to engage another roll;
- a pair of blades mounted on said chamber adjacent respective ones of said sides and extending into the chamber and with edges of the blades engaging said roll at spaced locations and parallel to said axis;
- said edges of said blades being angular spaced from one another by more than 180° as measured in said chamber;
- an adjustment mechanism at each end of the chamber to move the enclosed chamber doctor blade assembly relative to the said roll for said blade adjustment;
- a pair of end seals located respectively at each end of the chamber and are in contact with the side of the roll face and control leakage out of the ends of the chamber;
- and
- a pair of end plates that house the end seals and capture the controlled leakage from the end seals.
Dependencies are inferred from the claim text.