Translational wiping technique for an inkjet printhead

摘要

An inkjet printer (10) has a printhead mounted in a carriage (20) which periodically moves along a printhead path (58) in a carriage scan direction to a stop position in a service station (50,52) where an actuation device imparts translational motion to a wiper blade (688). The wiper blade (688) moves along a linear wiping path orthogonal to the printhead path (58) and across ink orifices on a nozzle surface of the printhead during a wiping operation. The wiper blade is removably mounted on a base (684) and is split to form a first blade for wiping one column of ink orifices and a second blade for simultaneously wiping another column of ink orifices on a nozzle surface of the printhead. In a preferred form of the invention, the service station (50) provides different sequential wiping steps with successive wiper blades by first drawing ink onto the nozzle surface from the ink orifices with a rounded blade edge (756) of a leading wiper blade, and then wiping the ink from the nozzle surface with a sharp blade edge (758) of a following wiper blade. The sequential wiping steps are repeated twice during a normal wiping cycle -- once when the wiper blades leave a parking location to wipe across the stationary printhead, and again when the wiper blades change direction to wipe back across the same stationary printhead to return to the parking location located away from the printhead path. <IMAGE>