Patent ID: 7018011
Filing Date: 2006-03-28
Classification: B41J

Abstract:
1. A pump for an inkjet printer applying a negative pressure to an inkjet head nozzle, comprising: a driving gear surrounding a shaft and rotatable in a direction about the shaft and including a stopper integrally formed on a side of the driving gear and having at least one protrusion; a ratchet rotatable about the shaft, movable about an axial direction, having one or more cam recesses formed on an upper side each of which receive the at least one protrusion, and having a driving ratchet formed at a lower side; a tube connected to the inkjet head nozzle and being U-shaped; a plurality of rollers which contact an inner arch of the tube and having a tapered shape; and a rotor to which the plurality of rollers are rotatably mounted, rotatable about the fixing shaft, movable about an axial direction, and having a driven ratchet formed on an upper side, wherein, when the rotor rotates in a direction, at least one of the plurality of rollers rotate and squeeze the tube, wherein, when the rotor stops rotating, the plurality of rollers return to a state in which the plurality of rollers do not squeeze the tube due to a recovering force of the tube, and wherein the squeezing of the tube generates the negative pressure in the inkjet head nozzle.