Doctor blade and holder for metering system
OwnerJerome D. Jenkinsinventor
Life of this patent
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Abstract
An ink metering system for a rotating ink roll having a shaft journalled in the frame of a inking system includes two doctor blades and a mechanism for supporting the doctor blades on the shaft of the ink roll so that the doctor blades contact the ink roll under uniform pressure independent of movement between the ink roll and the frame. The arrangement also includes a mechanism for adjusting the pressure of the doctor blades and for sealing the system. The doctor blade is composed of polytetrafluoroethylene-polyphenylene sulfide ceramic resin containing graphite fibers. The doctor blade includes a number of laminated sheets of this material in which a majority of the sheets include fibers oriented in the machine direction and at least one sheet includes fibers oriented perpendicular to the machine direction.
Claims23
An ink metering system for a rotating ink roll having a shaft journalled in the frame of an inking system, the ink metering system comprising:
- a first doctor blade;
- means for supporting the first doctor blade on the shaft of the ink roll so that the first doctor blade contacts the ink roll at a uniform pressure independent of relative movement between the ink roll and the frame, the supporting means including inner bearing elements mounted on and sealed to the shaft at each end of the ink roll to rotate with the shaft and outer bearing elements paired with, rotatable relative to, and sealed to the inner bearing elements;
- and
- means for contacting the ink roll at a position spaced from the first doctor blade, the contacting means supported by the supporting means, wherein the first doctor blade, the contacting means, and the supporting means form housing means surrounding a portion of the ink roll for containing ink between the housing means and the ink roll.
The system of claim, 2 wherein the second doctor blade is mounted at an angle of about 30.degree. from a tangent line of the roll opposite the direction of rotation.
Dependencies are inferred from the claim text.