PUMP DEVICE OF INKJET PRINTER

摘要

PURPOSE: A pump is provided not to reduce the reliability of a suction operation though the pump is used for a long time. CONSTITUTION: A tube is connected with an inkjet head nozzle portion and installed in a semi-circular shape. Plural rollers are installed inside the tube to be contacted to the tube. The rollers have tapered shapes. A rotor contains the rollers, rotates one of the rollers by pressurizing the tube when rotating in one direction and rotates the rollers not by pressurizing the tube when stopping. The negative pressure is generated in the inkjet head nozzle portion by compressing the tube when the rotor is rotated in one direction. Thereby, the reliability of a suction operation in a pump is not reduced though the pump is used for a long time.