Constant bevel doctor blade and method and apparatus using same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jan 22, 1980
Issued Date -
N/A
app pub date -
Jan 29, 1976
filing date -
Feb 9, 1972
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A doctor blade for wiping excess ink from a printing surface of a printing form is disclosed herein, along with a method for making such a doctor blade, and printing equipment and methods using such doctor blade. The disclosed doctor blade comprises a doctor blade body having a constant blade thickness between parallel blade surfaces, and a marginal blade tip portion adjacent the doctor blade body having a shaped blade bevel essentially identical to the run-in blade bevel of a wedge-shaped conventional blade at optimum tonal quality size. Throughout a useful depth of its blade tip portion, the disclosed doctor blade has a constant blade tip thickness equal to the height of the shaped blade bevel measured essentially perpendicularly to the mentioned useful depth, which is equal to several times the shaped blade bevel height. In consequence, the effective area of the shaped blade bevel remains constantly at the above mentioned optimum size despite progressive wear of marginal blade tip portion in the direction of and throughout the useful depth during the excess ink wiping operation.
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