The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 11, 1995
Filed:
Aug. 06, 1992
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A recording apparatus for performing recording with an ink jet recording head, capable of ejecting ink onto a recording medium, comprises a cap to be opened and closed with respect to a discharge-orifice face of the recording head and a cap drive mechanism for opening the cap at the initiation of recording head driving and closing the cap when a non-driving period of the recording head exceeds a predetermined period of time .alpha.. A preliminary ejection circuit causes ejection of ink from the discharge orifices by driving the recording head to remedy defective ink ejection and preliminary ejection drive circuitry provides for preliminary ejection when a predetermined period of time .beta. is exceeded after a previously executed preliminary ejection, wherein the predetermined period of time .beta. does not include time during which the cap is closed.