Ink jet cartridge and ink jet printer using it.

摘要

An ink jet cartridge comprises ink sack (30) for storing the recording ink, a head chip for ejecting ink supplied from ink sack (30) according to the content being recorded, a head case and an ink supply case (50) for holding ink sack (30) and other components. To avoid pressure applied to the ink sack at the start of printing from increasing excessively when the amount of ink in the ink sack is high, and to enable effective use of the remaining ink when the amount of remaining ink is low, a thick-wall region (33) to be pressed by a pressure rod (63) is provided on a side of ink sack 30. A through-hole (62) for guiding pressure rod (63) to push thick-wall region (33) to one side of the ink sack is provided in the bottom of the case (50) and a guide member (34) for guiding the end of pressure rod (63) to thick-wall region (33) is provided around thick-wall region (33) or around the through-hole.