Abstract: A printing machine comprises a frame for supporting a pair of roller shafts spaced apart at a predetermined distance from each other and, a flat platen disposed between the roller shafts. An endless sheet-feeding belt made of an elastic material is stretched between the roller shafts. The sheet-feeding belt has an inner surface sliding on the flat platen by rotation of the roller shafts and an outer surface having such a high frictional coefficient that allows a sheet on the outer surface to be fed together with the sheet-feeding belt. A pair of pinch rollers hold the sheet in cooperation with the outer surface of the sheet-feeding belt at the roller shafts, for feeding the sheet. A printing head is opposed to the outer surface of the sheet-feeding belt at the flat platen.

Abstract: A sheet conveying apparatus for printer, comprises an apparatus body with first and second sheet exhaust ports, a printing unit provided in the apparatus body, a paid of feeding rollers for feeding a sheet to the printing unit, and a pair of exhaust rollers for exhausting the sheet from the printing unit. The apparatus body has a support frame for rotatably carrying one of the feeding rollers and one of the exhaust rollers. The contact force of the feeding rollers and the contact force of the exhaust rollers are simultaneously adjusted by an eccentric roller. Further, the apparatus body has a sheet exhaust direction changing mechanism for selecting one of the sheet exhaust ports in accordance with the type of sheet, in cooperation with the movement of the support frame.