PURPOSE: To provide an title accumulator for printing and coping device using ink jet with large effect of eliminating pulsation in the pump by installing a ram in a cylinder placed on a base member through bellows between the cylinder and the base member and further installing small springs witg a small value of spring constant which pull the ram to the side of the vase member.

CONSTITUTION: A cylindrical body 12 is mounted on a base member 11 that has inlet and oulet for ink, and a ram 13 is placed in the body 12. Between the end of the ram 13 and the base member 11, bellows 14 are installed, and an accumulator is constituted by installing outside of the body 12 small springs 15 with a small value of spring constant that pull the ram to the side of the base member 11.

EFFECT: The displacement of spring to obtain a specified pressure is made small by using a plural number of tension springs with the result of excellent pressure accumulating characteristics which make the printing characteristics stable and by which accumulator can be constructed smaller.