Inkjet printing apparatus

An inkjet printing apparatus comprising:na printing device having a first ink group and a second ink group, which prevents a sedimentation of the first ink group;a platen ink absorber configured to receive inks ejected from the printing device during a marginless printing;a counting device configured to count, for each of a plurality of regions into which the platen ink absorber is divided, ink volumes of the first ink group and the second ink group ejected from the printing device; andan estimation device configured to estimate a ratio of ink components for each of the color inks and for each of the plurality of regions;wherein, from a result of the estimation by the estimation device and from a result of the counting by the counting device, a decision is made as to whether the first ink group will sediment on the platen ink absorber, andwhen it is decided that the first ink group will sediment, an ink of the second ink group is ejected.

An inkjet printing apparatus which can perform margin-less printing comprising:na printing head which can eject a first ink group, which is likely to produce ink sediment, and a second ink group, which is likely to restrain ink sedimentation;a supporting member provided in a position in which the supporting member faces the printing head to support a printing medium;a calculation unit configured to calculate a total quantity which is a sum of (i) a first quantity of liquid necessary to restrain ink sedimentation based on ink quantities of the first ink and the second ink which are ejected to the supporting member before the printing movement for the printing medium is carried out during the margin-less printing movement multiplied by a first coefficient, and (ii) a second quantity of liquid necessary to restrain ink sedimentation based on the ink quantities of the first ink and the second ink which are ejected to the supporting member after the printing movement for the printing medium is carried out during the margin-less printing movement multiplied by a second coefficient different from the first coefficient; anda control unit configured to perform control to eject an amount of a liquid necessary to restrain ink sedimentation equal to the total quantity calculated by the calculation unit to the supporting member after margin-less printing movement.

An inkjet printing apparatus which can perform margin-less printing comprising:na printing head which can eject a first ink, which is likely to produce ink sediment, and a second ink, which is likely to restrain ink sedimentation;a supporting member provided in a position in which the supporting member faces the printing head to support a printing medium;a calculation unit configured to calculate a total quantity which is a sum of (i) a first quantity of liquid necessary to restrain ink sedimentation based on ink quantities of the first ink and the second ink which are ejected to the supporting member before the printing movement for the printing medium is carried out during the margin-less printing movement multiplied by a first coefficient, and (ii) a second quantity of liquid necessary to restrain ink sedimentation based on ink quantities of the first ink and the second ink which are ejected to the supporting member after the printing movement for the printing medium is carried out during the margin-less printing movement and multiplied by a second coefficient different from the first coefficient; anda control unit configured to perform control to eject an amount of liquid necessary to restrain ink sedimentation equal to the total quantity calculated by the calculation unit to the supporting member after margin-less printing movement.

An inkjet printing apparatus comprising:na printing head which can eject a first ink group, which is likely to produce ink sediment, and a second ink group, which is likely to restrain ink sedimentation;an ink absorber configured to absorb ink ejected by the printing head when performing margin-less printing;a first calculation unit configured to calculate a first ink quantity, which is a quantity of ink that settles in the ink absorber when printing at a leading edge of a printing medium, based on quantities of the first ink group and the second ink group ejected when performing margin-less printing at the leading edge of the printing medium;a second calculation unit configured to calculate a second ink quantity, which is a quantity of ink that settles in the ink absorber when printing at a trailing edge of the printing medium, based on quantities of the first ink group and the second ink group ejected when performing margin-less printing at the trailing edge of the printing medium; anda determining unit configured to determine a quantity of an application ink to be applied to the ink absorber based on the first ink quantity and the second ink quantity.