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AssigneeCanon Kabushiki Kaisha
InventorsKenji Shigeno, Tetsuya Ishikawa, Haruyuki Yanagi, Kentaro Onuma
Estimating the term…
In order to stabilize a performance of a pump employed for processing in an inkjet printing apparatus such as sucking ink from a printing head with a low cost configuration and without the need of using any specific detecting unit, the following configuration is employed. Namely, a tube pump having a member with a curved surface aligned with a flexible tube for supporting the tube and a roller which moves while pressing (squeezing) the flexible tube is driven with a DC motor. To keep revolutions always constant, a current PWM control is employed for changing a power applied to the motor according to load fluctuations, and a phase of the roller is determined based on the current PWM value to manage a pressure generated by the pump and a discharge rate.
An inkjet printing apparatus which uses a printing head for ejecting ink, the inkjet printing apparatus comprising:
A method of controlling an inkjet printing apparatus having a printing head capable of ejecting ink, a plurality of negative pressure generating units, each of which has a cap configured to contact an ejection face of the printing head, a tube connected to the cap, and a roller capable of pressing the tube, a DC motor which drives the plurality of negative pressure generating units, a control unit which supplies electrical power to the DC motor, a detecting unit which detects electrical power, and a determining unit which determines a position of each of the plurality of rollers and a phase of each of the plurality of rollers, the method comprising the steps of:
Dependencies are inferred from the claim text.