Abstract: A printer having a print head with a mounting portion, and a carriage with a supporting structure engaging the mounting portion of the print head to hold it in place on the carriage. The supporting structure includes a lateral positioning portion for positioning the print head laterally in a direction of movement of the carriage, a downward positioning portion for positioning the print head downwardly of the carriage, and a rear wall for receiving a force of reaction of the print head upon printing action on a platen. The printer comprises a biasing device for biasing the mounting portion of the print head downwardly and rearwardly against the downward positioning portion and rear wall of the supporting structure of the carriage, respectively. The carriage may include a serrated portion fixedly engaging a toothed belt for driving the carriage along the platen.

Abstract: A printing paper feeding mechanism for a printer having a pin tractor for feeding a web with holes perforated at periodic locations along both edges and a pair of rollers for drawing out the web fed by the pin tractor through a printing position while pinching the web under pressure. The pin tractor and one of the rollers are driven by a motor through a transmitting device such that the rollers are imparted a slightly faster feeding action than the pin tractor for preventing the web from being slackened. The rollers are adapted to be used independently of the pin tractor for feeding a cut sheet paper at the same speed as the web fed by the pin tractor by driving the motor at a reduced amount of rotation for a unit line spacing amount than usual.