Ink distribution assembly for an ink jet printhead
View Patent ↗An ink distribution assembly for a page width ink jet printhead in the form of at least one printhead chip having sets of ink inlet openings, each set having inlet openings for receiving an ink of a particular color to be supplied to the printhead chip, includes a carrier with a printhead side that is engageable with the printhead and an opposed ink supply side. The carrier defines feed openings through the carrier in fluid communication with respective ink inlet openings of the printhead. The ink supply side of the carrier defines a number of discrete feed formations, each feed formation being configured to receive ink of a particular color and to be in fluid communication with inlet opening of a respective set. The printhead side of the carrier defines ink supply formations and the carrier defines passages in fluid communication between the ink supply formations and one of the feed formations. A cover is engageable with the carrier at the ink supply side. The cover and the ink supply side of the carrier are shaped so that, when the cover is in position, the cover serves to define a roof for the feed formations and so that the cover and the ink supply side of the carrier define ink pathways that are in fluid communication with respective feed formations. The carrier defines ink supply openings in fluid communication with respective ink pathways.
1. An ink distribution assembly for a page width ink jet printhead in the form of a number of elongate printhead chips having sets of ink inlet openings, each set receiving an ink of a particular color to be supplied to the printhead chips, the assembly comprising
an elongate carrier having a printhead side, an opposed ink supply side an elongate recess on the printhead side dimensioned to receive the printhead chips end-to-end, feed openings to be in fluid communication with respective ink inlet openings of the printhead chips, a number of feed formations upstream of, and in fluid communication with respective sets of the feed openings, the printhead side defining at least one of the feed formations in fluid communication with the inlet openings of one set, from the printhead side to the ink supply side through the carrier, and ink supply passages interconnecting the feed formations and respective feed openings, the ink supply passages converging laterally towards the recess; and
a cover assembly that is engageable with the carrier, the cover assembly being configured to enclose the feed formations and one of the carrier and the cover assembly defining ink supply openings in fluid communication with respective feed formations.
2. An ink distribution assembly as claimed in claim 1 , in which the carrier is a product of an injection molding process.
3. An ink distribution assembly as claimed in claim 2 , in which the carrier is of a plastics material.
4. An ink distribution assembly as claimed in claim 1 , in which the carrier has a generally planar central portion and a pair of opposed sidewall portions so that the central portion and the sidewall portions define a region that engages the cover assembly.
5. An ink distribution assembly as claimed in claim 1 , in which the carrier defines three sets of feed openings, each set of feed opening corresponding with a set of ink inlet openings of the printhead so that three differently colored inks can be supplied to the printhead.
6. An ink distribution assembly as claimed in claim 5 , in which the printhead side of the carrier defines a pair of the feed formations in the form of ink supply channels, one on each side of the longitudinal recess.
7. An ink distribution assembly as claimed in claim 6 , in which a pair of longitudinally extending walls are positioned on the carrier to define a longitudinally extending channel in which one set of the feed openings are positioned, a row of spaced, laterally extending walls being positioned on each side of the longitudinally extending walls, so that the laterally extending walls define rows of the ink supply passages terminating at the longitudinally extendint walls, a feed opening being positioned in each of the ink supply passages at the longitudinally extending walls, each lateral wall defining a passage from one of the ink supply channels on the printhead side of the carrier to the longitudinally extending channel.
8. An ink distribution assembly as claimed in claim 7 , in which the side wall portions and the cover assembly are shaped so that one feed formation is defined between the cover assembly and each of the side wall portions.
9. An ink distribution assembly as claimed in claim 6 , in which a pair of ink supply passages extend through the carrier, one upstream of each ink supply channel and downstream of a respective ink supply opening.
10. A page width printing device, which comprises
a page width ink jet printhead in the form of a number of elongate printhead chips having sets of ink inlet openings, each set receiving an ink of a particular color to be supplied to the printhead chips;
an elongate carrier having a printhead side, an opposed ink supply side, an elongate recess on the printhead side dimensioned to receive the printhead chips end-to-end, feed openings to be in fluid communication with respective ink inlet openings of the printhead chips, a number of feed formations upstream of, and in fluid communication with, respective sets of the feed openings, the printhead side defining at least one of the feed formations in fluid communication with the inlet openings of one set, from the printhead side to the ink supply side through the carrier, and ink flow passages interconnecting the feed formations and respective feed openings, the ink flow passages converging laterally towards the recess; and
a cover assembly that is engageable with the carrier, the cover assembly being configured to enclose the feed formations and one of the carrier and the cover assembly defining ink supply openings in fluid communication with respective feed formations.