| 摘要 |
PROBLEM TO BE SOLVED: To enable the operation for pressing a roller to a tube and the operation for releasing the pressing operation regardless of the position of the roller of a tube pump. SOLUTION: The tube pump 15 provided in an ink jet recording apparatus has a pump base 16 supporting and fixing a tube 17 in an almost circular arc shape, a roller driving wheel 21 having the cam part 20b for pressing rollers 18, 19 to the tube 17 formed thereon and revolving the rollers along the almost circular arc-shaped tube 17 and the roll guide wheel 20 supporting the rollers and provided so as to be revolvable independently of the roller driving wheel 21. A roller guide spring 22 is brought into contact with the roll guide wheel 20 in order to suppress the revolution of the roller guide wheel along with the roller driving wheel 21 when the roller driving wheel 21 is revolved and the rolls are relatively moved between both terminal parts 20c, 20d of the part 20b. |
