EP0714776A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Ink-jet printing apparatus
Assignee: Canon Inc
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Filing: 1995-11-30
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Granted: —
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Expires: 2015-11-30
Abstract
Abstract An ink-jet printing apparatus is capable of restricting recovering operation for a printing head (6) into necessary minimum times for preventing defect to be caused upon printing, limit waste ink amount and avoid possibility of damaging the printing head (6). Thus, the apparatus divides nozzles having nozzle number of 1 to 512 into 8 nozzle blocks. With respect to each nozzle block, number of ink ejection data in the corresponding image data is integrated. When the integrated value becomes greater than or equal to a predetermined value, the recovering operation is taken place for the printing head (6).
Inventors
- 👤 Mineo c/o Canon K.K. Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 15:43
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/165; G; G06; G06K; G06K15/00; G06K15/02; G06K15/10; G06K15/102; G06K2215/00; G06K2215/0082; G06K2215/0085
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
102 words
An ink-jet printing apparatus performing printing by ejecting ink from a printing head on the basis of ink ejection data in an image data, characterized by comprising: a printing head having a plurality of nozzles for ejecting the ink; recovering means for maintaining said printing head in good condition; counting means dividing said plurality of nozzles into a plurality of nozzle groups for counting the number of said ink ejection data in said image data for a predetermined printing amount per each nozzle group; and control means for operating said recovering means depending upon the result of counting by said counting means.
Claim 2
Dependent Claim
55 words
An ink-jet printing apparatus as claimed in claim 1, characterized in that said control means operates said recovering means when an integrated number of the ink ejection data as counted by said counting means becomes greater than or equal to a predetermined number, and in conjunction therewith clears said integrated value of said counting means.
Claim 3
Dependent Claim
24 words
An ink-jet printing apparatus as claimed in claim 1, characterized in that each of said nozzle groups includes nozzles overlapping with adjacent nozzle group.
Claim 4
Dependent Claim
29 words
An ink-jet printing apparatus as claimed in claim 1, characterized in that said recovering means includes a wiper for scraping an ejection opening forming surface of the recording head.
Claim 5
Dependent Claim
26 words
An ink-jet printing apparatus as claimed in claim 1, characterized in that said recovering means includes a pump for discharging the ink from said printing head.
Claim 6
Dependent Claim
32 words
An ink-jet printing apparatus as claimed in claim 1, characterized in that said printing apparatus is a serial scan type ink-jet printing apparatus, and said predetermined printing amount corresponds to one line.
Claim 7
Dependent Claim
32 words
An ink-jet printing apparatus as claimed in claim 2, characterized in that said printing apparatus is a serial scan type ink-jet printing apparatus, and said predetermined printing amount corresponds to one line.
Claim 8
Dependent Claim
40 words
An ink-jet printing apparatus as claimed in claim 1, characterized in that said printing head is divided into a plurality of nozzle groups for respective color inks and into a plurality of nozzle groups with respect to said black ink.
Claim 9
Dependent Claim
28 words
An ink-jet printing apparatus as claimed in claim 8, characterized in that said plurality of nozzle groups for the black ink includes nozzles overlapping with adjacent nozzle group.
Claim 10
Dependent Claim
63 words
An ink-jet printing apparatus as claimed in claim 1, characterized in that said counting means includes a plurality of counters respectively corresponding to said plurality of nozzle groups and means for distributing the printing data to respectively corresponding plurality of counters, and said counter generates an overflow signal when said number of ink ejection data in said printing data reaches a predetermined number.
Claim 11
Dependent Claim
54 words
An ink-jet printing apparatus or method or a device or method for controlling an ink-jet head or heads wherein operation of recovery means for cleaning or unblocking nozzles of the ink-jet head is controlled in accordance with the ink ejection data for each of a group of nozzles of the ink-jet head or heads.
References Cited (Backward Citations)
JPH0564890A
Cited
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