Patent ID: 8517617

Claim:
A printer comprising: a double-side feeding path configured such that a first sheet is conveyed thereon in a double-side printing operation; a manual feeding path configured such that a manually-fed second sheet is conveyed therethrough to a junction where the manual feeding path joins the double-side feeding path; a detector configured to detect the second sheet manually fed via the manual feeding path; and a controller configured to, when the detector detects the second sheet during a continued-execution period, continue the double-side printing operation for the first sheet being conveyed on the double-side feeding path, wherein the controller is further configured to, when the detector detects the second sheet outside of the continued-execution period, stop the double-side printing operation, and wherein the continued-execution period is a time period during which a trailing end of the second sheet passes through the junction where the manual feeding path joins the double-side feeding path before a leading end of the first sheet reaches the junction so as to prevent the feeding of the second sheet from disturbing the feeding of the first sheet.