INK JET RECORDING APPARATUS AND ABNORMALITY DETECTION METHOD OF EJECTOR
First Claim
1. An ink jet recording apparatus comprising:
- an ink jet head having a plurality of ejectors that eject droplets;
a medium transport unit that transports a recording medium;
a calculation unit that calculates an index value relevant to a droplet ejection amount for each of the ejectors which is expected during recording of a printed image with respect to each of the plurality of ejectors, on the basis of printing data for specifying contents of the printed image which is recorded on the recording medium by the ink jet head;
a threshold determination unit that determines a threshold for ejection abnormality determination for each of the ejectors, in accordance with the index value for each of the ejectors calculated by the calculation unit;
a threshold storage unit that stores the threshold determined for each of the ejectors by the threshold determination unit; and
an abnormality determination unit that determines presence or absence of an ejection abnormality by comparing a measurement amount of each of the ejectors obtained by inspecting an ejection state of the ejector with the threshold determined for each of the ejectors relating to the measurement amount.
1 Assignment
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Accused Products
Abstract
Provided are an ink jet recording apparatus and an abnormality detection method of an ejector which are capable of performing high-accuracy abnormality detection and suppressing the generation of excessive abnormality detection with respect to a required image quality. An ink jet recording apparatus (10) includes an ink jet head (20C, 20M, 20Y, 20K) having a plurality of ejectors, a medium transport unit (22), a calculation unit (34) that calculates an index value relevant to a droplet ejection amount for each ejector on the basis of printing data, a threshold determination unit (40) that determines a threshold for ejection abnormality determination for each ejector in accordance with the index value, a threshold storage unit (44) that stores the threshold determined for each ejector, and an abnormality determination unit (54) that determines the presence or absence of ejection abnormality by comparing the threshold with a measurement amount for each ejector.
23 Citations
20 Claims
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1. An ink jet recording apparatus comprising:
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an ink jet head having a plurality of ejectors that eject droplets; a medium transport unit that transports a recording medium; a calculation unit that calculates an index value relevant to a droplet ejection amount for each of the ejectors which is expected during recording of a printed image with respect to each of the plurality of ejectors, on the basis of printing data for specifying contents of the printed image which is recorded on the recording medium by the ink jet head; a threshold determination unit that determines a threshold for ejection abnormality determination for each of the ejectors, in accordance with the index value for each of the ejectors calculated by the calculation unit; a threshold storage unit that stores the threshold determined for each of the ejectors by the threshold determination unit; and an abnormality determination unit that determines presence or absence of an ejection abnormality by comparing a measurement amount of each of the ejectors obtained by inspecting an ejection state of the ejector with the threshold determined for each of the ejectors relating to the measurement amount. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification