초록 ▼

A ribbon is driven past the printing station of a printer only when the print head is moved in the right-to-left direction across the printer. An endless timing belt causes rotation of a gear pulley that is in mesh with an idler gear. The idler gear is supported on a pair of projecting fingers of a

A ribbon is driven past the printing station of a printer only when the print head is moved in the right-to-left direction across the printer. An endless timing belt causes rotation of a gear pulley that is in mesh with an idler gear. The idler gear is supported on a pair of projecting fingers of a plate that is swingable on the center of the gear pulley. The idler gear is responsive to the direction of rotation of the gear pulley through a drag effect of the projecting fingers with the bottom surface of the idler gear.

대표청구항 ▼

Mechanism for driving a ribbon in a printer having a frame, said mechanism comprising an endless timing belt driven in reciprocating manner across said printer, a gear pulley engaged with said endless timing belt and rotatable about a pivot in either a clockwise or a counterclockwise direction in re

Mechanism for driving a ribbon in a printer having a frame, said mechanism comprising an endless timing belt driven in reciprocating manner across said printer, a gear pulley engaged with said endless timing belt and rotatable about a pivot in either a clockwise or a counterclockwise direction in response to the direction of travel of said timing belt, an idler gear engaged with said gear pulley and operably associated in mesh relationship therewith, an idler gear support member swingable on said pivot and responsive to the direction of rotation of said gear pulley, said support member including projecting means engaging one surface of said idler gear to provide a drag effect thereon in opposition to rotation of said idler gear produced by rotation of said gear pulley, and a ribbon drive member comprising a drive gear in position to mesh with said idler gear and to drive said ribbon upon swinging of said idler gear in response to rotation of said gear pulley in one direction.