Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
2005-03-08
2005-03-08
Hsieh, Shih-Wen (Department: 2861)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
C347S029000, C347S035000
Reexamination Certificate
active
06863367
ABSTRACT:
An ink jet printing apparatus which performs printing by using a print head. The print head has at least a predetermined number of nozzles to eject ink. The apparatus includes a first prefiring mechanism for causing the print head to perform a prefiring operation to eject ink from nozzles of the print head for maintaining printing quality after a first time interval during a printing operation. The apparatus also includes a driving mechanism for driving nozzles of the print head based on data to be printed, and a second prefiring mechanism for causing the print head to perform the prefiring operation in a case where a number of the nozzles to be driven is changed. Preferably, the apparatus further includes a shifting mechanism for causing the driving mechanism to drive the nozzles of the print head based on the first time interval during the printing operation so as to enhance a power of ejecting ink and continue the printing operation after the first time interval without performing the prefiring operation. The shifting mechanism also preferably delays the prefiring operation to a second time interval longer than the first time interval, and after the second time interval, the first prefiring mechanism causes the print head to perform the prefiring operation. In a case where the number of nozzles to be driven is changed within a time duration after the first time interval and during the second time interval, the second prefiring mechanism causes the print head to perform the prefiring operation.
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Search results from Canon patent database (Search terms: paper + Printer + (Feed or Load) + [(Ink+Jet) or Inkjet] + Speed + Canon + B41J).
Search results from Canon patent database (Search terms: Carriage + Printer + (Scan or Margin) + [(Ink + Jet) or Inkjet] +Canon + B41J).
Search results from Canon patent database (Search terms: (Printer or Print or Head or [Print + Head or Printhead]) + [(Ink + Jet) or Inkjet] + (Alignment or Align) + Canon + B41J).
Search results from Canon patent database (Search terms: Printer + [(Ink + Jet) or Inkjet] + (Bleed or Smear or Load) + Temperature + Canon + B41J).
Search results from Canon patent database (Search terms: Black + Text + Printer + [(Ink + Jet) or Inkjet] + Canon + B41J).
Search results from Canon patent database (Search terms: Forward + Black + Text + Printer + [(Ink + Jet) or Inkjet] + Canon + B41J).
Search results from Canon patent database (Search terms: Nozzle + Forward + Black + Text + Printer + [(Ink + Jet) or Inkjet] + Canon + B41J).
Search results from Canon patent database (Search terms: [(Ink + Jet) or Inkjet] + Printer + Pre-Ejection + Canon + B41J).
Search results from Canon patent database (Search terms: [(Ink + Jet) or Inkjet] + Printer + Pulse + Width + Canon + B41J).
Search results from Canon patent database (Search terms: Dye + Pigment + Black + Printer + [(Ink + Jet) or Inkjet] + Canon + B41J).
Search results from Canon patent database (Search terms: Five + Color + Printer + [(Ink + Jet) or Inkjet] + Canon + B41J).
Hamamoto Akihiko
Hirabayashi Hiromitsu
Yamada Akitoshi
Fitzpatrick, Cella, Harper and Scinto
Hsieh Shih-Wen
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