Recording material feeding device and recording apparatus

A printing apparatus comprising:

• a print unit configured to print an image on a sheet with an inkjet head;
• and
• a control unit configured to perform registration of the sheet by forming a bend with the sheet prior to be printed,
• wherein, when printing on a first surface and a second surface of the sheet in sequence, the control unit controls such that a first registration time to form the bend prior to printing on the first surface differs from a second registration time to form the bend prior to printing on the second surface, and
• wherein the second registration time is set in accordance with a longitudinal elasticity of the sheet which has been subjected to printing on a first surface by the print unit.

A printing apparatus adapted to perform both side printing including a first side printing and a second side printing, comprising:

• a print unit configured to print an image on a sheet with an inkjet head;
• a conveying unit having a roller configured to convey the sheet to the print unit:
• and
• a control unit configured to control the conveying unit to perform registration of the sheet before printing, by letting a leading end of the sheet contact the roller while the roller temporary stops rotation during a registration time,
• wherein the control unit sets the registration time at each of the registration for the first side printing and the second side printing, and the registration time for the second side printing is variable in accordance with a longitudinal elasticity of the sheet.

A printing method of performing printing on a sheet, comprising:

• performing a first registration of the sheet by letting a leading end of the sheet contact a roller while the roller temporary stops rotation during a first registration time to form a bend of the sheet;
• performing a first side printing on a first side of the sheet with an inkjet head after the first registration;
• performing a second registration of the sheet by letting a leading end of the sheet contact the roller while the roller temporary stops rotation during a second registration time to form a bend of the sheet;
• and
• performing a second side printing on a second side of the sheet which is a back of the first side of the sheet with the inkjet head after the second registration,
• wherein the second registration time is variable in accordance with a longitudinal elasticity of the sheet.

A printing apparatus comprising:

• a print unit configured to print an image on a sheet with an inkjet head;
• a roller configured to convey the sheet;
• a control unit configured to form a bend with the sheet prior to be printed by letting a leading end of the sheet contact the roller while the roller temporary stops rotation during a time;
• wherein, when printing on a first surface and a second surface of the sheet in sequence, the control unit sets the time to be a first time to form the bend prior to printing on the first surface, and a second time to form the bend prior to printing on the second surface, and
• wherein in case the sheet is a first type, the first time is different from the second time, and in case the sheet is a second type different from the first type, the first time is equivalent to the second time.