Printing apparatus and control method for printing apparatus
A printing apparatus includes: a conveyance unit configured to convey a printing medium in a conveyance direction; a first printing head configured to eject a first liquid onto the printing medium conveyed by the conveyance unit in a state where a distance between a first ejection surface where ejection ports are formed and the printing medium corresponds to a first distance; and a plurality of second printing heads each configured to eject a second liquid, which reacts upon coming into contact with the first liquid, onto the printing medium conveyed by the conveyance unit in a state where a distance between a second ejection surface where ejection ports are formed and the printing medium corresponds to a second distance smaller than the first distance, wherein the first printing head is provided upstream of the plurality of second printing heads in the conveyance direction.
1 . A printing apparatus comprising:
a conveyance unit configured to convey a printing medium in a conveyance direction;
a first printing head configured to eject a first liquid onto the printing medium being conveyed by the conveyance unit in a state where the first printing head is fixed in the printing apparatus such that a distance between a first ejection surface where ejection ports are formed and the printing medium corresponds to a first distance; and
a plurality of second printing heads each configured to eject a second liquid, which reacts upon coming into contact with the first liquid, onto the printing medium being conveyed by the conveyance unit in a state where the second printing heads are fixed in the printing apparatus such that a distance between a second ejection surface where ejection ports are formed and the printing medium corresponds to a second distance smaller than the first distance,
wherein the first printing head is provided upstream of the plurality of second printing heads in the conveyance direction.
2 . The printing apparatus according to claim 1 , wherein the first distance is larger than the second distance of any of the plurality of second printing heads.
3 . The printing apparatus according to claim 1 , wherein the second liquid is an ink for forming an image, and
wherein the first liquid is a processing liquid that insolubilizes the ink upon coming into contact with the ink.
4 . The printing apparatus according to claim 1 , wherein the second ejection surface includes a guard member provided to be protruding relative to the ejection ports.
5 . The printing apparatus according to claim 4 , wherein the guard member includes an opening through which the ejection ports are exposed.
6 . The printing apparatus according to claim 1 , wherein the first ejection surface includes a guard member provided to be protruding relative to the ejection ports.
7 . The printing apparatus according to claim 1 , wherein a plurality of the ejection ports are arranged in a sheet width direction intersecting the conveyance direction on the first ejection surface of the first printing head, and
wherein a plurality of the ejection ports are arranged in the sheet width direction on the second ejection surface of the second printing head.
8 . A printing apparatus comprising:
a first printing head configured to eject a first liquid in a state where the first printing head is fixed in the printing apparatus; and
a second printing head configured to eject a second liquid that reacts upon coming into contact with the first liquid in a state where the second printing head is fixed in the printing apparatus,
wherein the first printing head and the second printing head are each configured to be movable to (1) a first position for ejecting liquid onto a printing medium being conveyed in a conveyance direction and (2) a second position for standing by without ejecting liquid, and
wherein, in a direction perpendicular to an ejection surface on which an ejection port for ejecting liquid is formed, a distance the first printing head moves from the second position to the first position is different from a distance the second printing head moves from the second position to the first position.
9 . The printing apparatus according to claim 8 , wherein the second liquid is an ink for forming an image, and
wherein the first liquid is a processing liquid that insolubilizes the ink upon coming into contact with the ink.
10 . The printing apparatus according to claim 9 , wherein the first printing head is provided upstream of the second printing head in the conveyance direction.
11 . The printing apparatus according to claim 10 , comprising a plurality of the second printing heads,
wherein the first printing head is provided upstream of the plurality of the second printing heads in the conveyance direction.
12 . The printing apparatus according to claim 9 , wherein the first printing head is provided downstream of the second printing head in the conveyance direction.
13 . The printing apparatus according to claim 12 , comprising a plurality of the second printing heads,
wherein the first printing head is provided downstream of the plurality of the second printing heads in the conveyance direction.
14 . The printing apparatus according to claim 8 , wherein a second ejection surface of the second printing head includes a guard member provided to be protruding relative to ejection ports of the second printing head.
15 . The printing apparatus according to claim 14 , wherein the guard member includes an opening through which the ejection ports are exposed.
16 . The printing apparatus according to claim 8 , wherein a first ejection surface of the first printing head includes a guard member provided to be protruding relative to ejection ports of the first printing head.
17 . The printing apparatus according to claim 8 , wherein a plurality of the ejection ports are arranged in a sheet width direction intersecting the conveyance direction on the first ejection surface of the first printing head, and
wherein a plurality of the ejection ports are arranged in the sheet width direction on the second ejection surface of the second printing head.
18 . A control method for a printing apparatus including (1) a first printing head for ejecting a first liquid in a state where the first printing head is fixed in the printing apparatus and (2) a second printing head for ejecting a second liquid that reacts upon coming into contact with the first liquid in a state where the second printing head is fixed in the printing apparatus, the control method comprising:
moving the first printing head, in a direction perpendicular to an ejection surface on which ejection ports for ejecting liquid are formed, a first distance towards a first position for ejecting liquid onto a printing medium being conveyed in a conveyance direction from a second position for standing by without ejecting liquid; and
moving the second printing head, in a direction perpendicular to an ejection surface on which ejection ports are formed, a second distance, which is different from the first distance, towards a first position for ejecting liquid onto a printing medium being conveyed in the conveyance direction from a second position for standing by without ejecting liquid.
19 . The control method according to claim 16 , wherein the first liquid is ejected from a plurality of ejection ports arranged in a sheet width direction intersecting the conveyance direction on the first printing head, and
wherein the second liquid is ejected from a plurality of ejection ports arranged in the sheet width direction on the second printing head.