Suction recovery method and ink jet printing apparatus
AssigneeCanon Kabushiki Kaisha
InventorTetsuya Edamura
Life of this patent
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Abstract
A tube pump is continuously driven to set an interior of a cap at a target negative pressure, and then driving and stopping of the tube pump is repeated to maintain a predetermined suction pressure. Therefore, a suction operation can be performed without mixing bubbles in a liquid chamber or wasting inks.
Claims8
A suction recovery method for an ink jet printing apparatus for driving a tube pump connected to a cap while a face of a print head is capped by the cap, to generate a negative pressure inside the cap to suck an ink from said print head, the method comprising:
- a step of continuously driving the tube pump until a pressure of an interior of the cap becomes a first negative pressure;
- and
- a step of repeating an operation for a number of times which stops said tube pump until the pressure of the interior of the cap becomes a second negative pressure having a smaller absolute value than said first negative pressure and drives said tube pump again until the pressure of the interior of the cap becomes said first negative pressure.
An ink jet printing apparatus for driving a tube pump connected to a cap while a face of a print head is capped by the cap, to generate a negative pressure inside the cap to suck an ink from said print head, the apparatus comprising:
- control means for continuously driving the tube pump until a pressure of an interior of the cap becomes a first negative pressure and repeating an operation for a number of times which stops said tube pump until the pressure of the interior of the cap becomes a second negative pressure having a smaller absolute value than said first negative pressure and drives said tube pump again until the pressure of the interior of the cap becomes said first negative pressure.
Dependencies are inferred from the claim text.