Ink-jet recording apparatus

An ink jet recording apparatus having a feeding roller and a following roller operable to feed a recording medium while interposing said recording medium, and a recording head operable to eject ink droplets on said recording medium, said apparatus comprising:

• a paper gap switching portion operable to switch a first paper gap and a second paper gap by moving said print head, said second paper gap being larger than said first paper gap;
• and
• a pressing-force adjustment portion operable to apply a pressure to said following roller or release said pressure to adjust a pressing force applied to said recording medium, wherein
• three states are switched by a single operation lever, said three states including a state where said first paper gap is set and said pressure is applied, another state where said second paper gap is set and said pressure is applied, and still another state where said pressure is released.

An ink jet recording apparatus, having a print head for ejecting ink droplets on a recording medium, for performing printing for said recording medium by making said print head eject said ink droplets on said recording medium while said print head moves in a main scanning direction and said recording medium is moved in a sub-scanning direction, said apparatus comprising;

• a unidirectional printing portion operable to perform unidirectional printing in which said printing is performed in one of two directions contained in said main scanning direction;
• a bidirectional printing portion operable to perform bidirectional printing in which said printing is performed in both said two directions contained in said main scanning direction;
• and
• a printing-mode controlling portion operable to prohibit said bidirectional printing by said bidirectional printing portion when a thickness of said recording medium is out of a predetermined range, to force said unidirectional printing portion to perform said unidirectional printing.

An ink jet recording apparatus, having a print head operable to eject ink droplets on a recording medium, for performing printing by making said print head eject said ink droplets on said recording medium while said print head moves in a main scanning direction and said recording medium is moved in a sub-scanning direction, said apparatus comprising:

• a main controlling unit including a unidirectional printing portion operable to perform unidirectional printing in which said printing is performed in one of two directions contained in said main scanning direction and a bidirectional printing portion operable to perform bidirectional printing in which said printing is performed in both said two directions of said main scanning direction;
• and
• a paper gap switching portion operable to switch a first paper gap and a second paper gap by moving said print head in accordance with a thickness of said recording medium, said second paper gap being larger than said first paper gap, wherein
• said main controlling unit further comprises a printing-mode controlling portion operable to prohibit said bidirectional printing by said bidirectional printing portion and to force said unidirectional printing portion perform said unidirectional printing, when said second paper gap is set by said paper gap switching portion.