Ink jet cartridge and printer using it

An inkjet printer comprising:

• a reciprocating carriage;
• and
• an inkjet cartridge disposed on said carriage comprising:
• a recording head having nozzles for ejecting ink in accordance with recording data received from a host processor,
• an ink reservoir for accommodating recording ink and having an open end, a closed end, a thick-wall region and a thin-wall region, said ink reservoir being in communication with said recording head so that the ink stored in said ink reservoir is supplied to said nozzles,
• wherein the carriage moves along a first direction,
• wherein the open end of said ink reservoir has a first length along the first direction,
• wherein the open end of said ink reservoir has a second length along a second direction other than the first direction, and
• wherein the first length is greater than the second length,
• a housing, wherein said ink reservoir and recording head are arranged in said housing,
• a through-hole provided in a side of said housing disposed facing the thick wall region for accommodating an end of a pressure rod for applying pressure to the thick-wall region of said ink reservoir, and
• a guide disposed around one of
• (1) the thick-wall region of said ink reservoir and
• (2) said through-hole
• for guiding the end of the pressure rod to the thick-wall region of said ink reservoir.

An inkjet printer comprising:

• a reciprocating carriage;
• and
• an inkjet cartridge disposed on said carriage comprising:
• a recording head having nozzles for ejecting ink in accordance with recording data received from a host processor,
• an ink reservoir for accommodating recording ink and having an open end, a closed end, a thick-wall region and a thin-wall region, said ink reservoir being in communication with said recording head so that the ink stored in said ink reservoir is supplied to said nozzles;
• a housing, wherein said ink reservoir and recording head are arranged in said housing,
• a through-hole provided in a side of said housing disposed facing the thick wall region for accommodating an end of a pressure rod for applying pressure to the thick-wall region of said ink reservoir,
• wherein the pressure rod is inserted through said through-hole in a first direction,
• wherein the open end of said ink reservoir has a first length along the first direction,
• wherein the open end of said ink reservoir has a second length along a second direction other than the first direction, and
• wherein the first length is smaller than the second length, and
• a guide disposed around one of
• (1) the thick-wall region of said ink reservoir and
• (2) said through-hole
• for guiding the end of the pressure rod to the thick-wall region of said ink reservoir.