Maintenance system having cleanable wiper for printhead
View Patent ↗An apparatus for maintaining a printhead is provided having a rotatable wiper roller having a shaft and a porous material about the shaft, a rotatable transfer roller in rotatable contact with the wiper roller, and a mechanism for rotating the wiper roller so that the porous material rotates against the printhead such that the porous material absorbs fluid from the printhead during the rotation, and for rotating the transfer roller against the wiper roller so that the fluid absorbed by the porous material is transferred to the transfer roller.
1. A maintenance system for a printhead, the system comprising:
a support frame;
a wiper module supported by the support frame, the wiper module comprising a porous roller for rotatably contacting the printhead to absorb fluid and particulates from the printhead, a non-porous roller in rotatable contact with the porous roller to transfer the absorb fluid and particulates from the porous roller, and a scraper in contact with the non-porous roller to remove the transferred fluid and particulates from the non-porous roller during said rotation;
a lift mechanism for lifting the wiper module from the support frame to position the porous roller against the printhead; and
a rotation mechanism for rotating the porous and non-porous rollers so that the porous roller rotates against the printhead and the non-porous roller is rotated against the porous roller and the scraper.
2. A system according to claim 1 , wherein: the porous roller comprises porous material over a compressible core; and the lift mechanism is configured to position the porous material against the printhead so as to compress the compressible core.
3. A system according to claim 2 , wherein the core is formed of extruded closed-cell foam.
4. A system according to claim 2 , wherein the non-porous roller comprises a smooth hard cylinder which contacts the porous roller so as to compress the compressible core.
5. A system according to claim 2 , wherein the porous material is formed of non-woven microfiber.
6. A system according to claim 1 , wherein the scraper is resiliently flexible.