Patent ID: 6435663
Filing Date: 2002-08-20
Classification: B41J

Abstract:
A liquid discharge recording apparatus provided with a liquid discharge head for discharging liquid droplets from a plurality of discharge ports to record on a recording medium, a liquid discharge head unit integrally formed with a housing to hold said liquid discharge head, and a carriage capable of detachably mounting said liquid discharge head unit thereon, whereinsaid liquid discharge head unit comprises a columned guide pin arranged in the central portion of a rear bottom face of said liquid discharge head unit in a widthwise direction to be extended downward, a rear extrusion arranged in a central portion of an upper backside face of said liquid discharge head unit in a widthwise direction, having a spherical surface convex toward a rear side of said liquid discharge head unit, a columned extrusion and a side extrusion arranged on a front part of a side face of said liquid discharge head unit, a pair of guide ribs arranged on two side ends or in a vicinity of said two side ends on an upper rear portion of said liquid discharge head unit to face each other, each having an inclined upper surface made higher toward the rear side of said liquid discharge head unit, and a receiving rib arranged in a central portion on said upper rear portion of said liquid discharge head unit in a widthwise direction, being connected with said guide ribs on a rear side of said guide ribs, and having an inclined surface lowered once, and then, made higher toward said rear side of said liquid discharge head unit, and said carriage comprises a guide groove capable of sliding said liquid discharge head unit in a state of being in contact with said columned extrusion to be guided into a head unit mounting space, and holding said unit in such position rotatively centering on said columned extrusion, a head set plate for pressing said upper surface of said guide ribs so as to effectuate substantially horizontal movement of a pressurized position of said liquid discharge head unit from a front side to said rear side of said liquid discharge head unit at a time of being mounted on said carriage, and pressing said receiving rib after said liquid discharge head unit is mounted on said carriage, a first rib portion in U-letter or V-letter form to abut against a face of said guide pin in a state of said liquid discharge head unit being mounted on said carriage, a second rib portion in U-letter or V-letter form to abut against said spherical surface of said rear extrusion, a receiver abutting against said side extrusion, and a CR head spring to press said liquid discharge head unit to enable said side extrusion to abut against said receiver.