Printer capable of stable printing without pitch fluctuations and paper carrying mechanism therefor

Abstract

In a printer including a base frame, an upper frame rotatably coupled to the base frame, and a platen and a platen pulley both rotatably supported by the upper frame, a subframe is attached to the upper frame rotatably and movably in one direction. A reduction gear and a belt pulley both are rotatably supported by the subframe. A drive gear is rotatably supported by the base frame and engaged with the reduction gear. A drive belt is stretched between the platen pulley and the belt pulley. A spring is attached between the upper frame and the subframe. The base frame has a guiding portion concentric with the drive gear. The subframe has a guided portion opposite the guiding portion. The spring applies tension to the drive belt and brings the guided portion into contact with the guiding portion.

Dependencies are inferred from the claim text.