Abstract: A printer apparatus suitable for use in measuring systems and control systems. The printer apparatus has a casing accommodating a roll of a recording paper sheet and a cover means for covering and protecting the recording paper sheet after the printing. The cover means is shaped such as to follow the curvature of the upper portion of the roll of the recording paper sheet, and the recording paper sheet after the printing is guided along the curvature of the roll and is stored in the cover means in the form of a scroll.