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(11) | EP 0 705 784 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Printing position detection and correction methods for printing device |
(57) A printing state detection and correction method for a printing device wherein the
improvement consists in that when a pattern or letters are continuously and suitably
printed onto a strip-shaped article subjected to printing by means of a duplicator
to form a print portion, a variable density indicating portion to serve as a standard
for judgement of variable density of each color is printed in the same manner using
ink used for the formation of the print portion at a proper position around the print
portion to be printed, and at first a standard variable density for each color of
the variable density indicating portion is registered as data, next a CCD camera is
installed at a proper position through which the strip-shaped printed article after
printing passes, the variable density indicating portion is monitored by means of
the CCD camera to detect the variable density, and using data obtained thereby, the
variable density for each color is compared with said standard variable density for
each color, and instruction of correction is not given when the error is within a
range of setting of the standard, or instruction of correction is given to a control
portion of the printing device when the error is outside the range of setting of the
standard so as to control and adjust a sending amount of ink and the like. |