Patent ID: 8328443

Claim:
A printer comprising: a sheet holding unit configured to have a reference plane for positioning a first end face of roll paper and rotatably hold the roll paper according to an end face reference by the reference plane; a conveying unit configured to draw out the roll paper held by the sheet holding unit and guide and convey the roll paper along a predetermined guide path; a printing unit configured to apply printing based on print data to the roll paper guided and conveyed through the guide path; a contact body configured to have a contact section and to be rotatably provided with the contact section located on a free end side, the contact section coming into contact with a second end face of the roll paper held by the sheet holding unit; and an urging unit configured to urge the contact body in a first rotating direction for bringing the contact section close to the second end face of the roll paper and bring the contact section into contact with the second end face to bring the first end face of the roll paper into contact with the reference plane, wherein the sheet holding unit includes: a sheet holding shaft configured to project from the reference plane, cause a cylindrical paper pipe of the roll paper to be inserted thereover, and hold the roll paper; and a slide holding mechanism configured to allow the sheet holding shaft to slide between an upper position and a lower position and hold the sheet holding shaft in one of the upper position and the lower position.