Continuous paper feed prevention lock mechanism for printer

Abstract

A printer, for printing on continuous recording paper, includes tractors disposed in the recording paper feed path of the printer, with each of the tractors circumferentially travelling in synchronism with movement of the continuous recording paper when the tractors engage feed holes of the continuous paper. When no printing operation is performed, travel of the tractors can be prevented by operation of an electromagnetic clutch, or a combination of one way clutches. Further, the printer uses an electrophotographic method wherein when no printing operation is performed, a transfer charger or fixing roller can be retracted from an operational position. A lever, associated with movement of the transfer charge or fixing roller, is pressed against and locked with the pulley fixed to the rotating shaft of each of the tractors to thereby prohibit the movement of the tractor. Further, a swingable arm can be provided having an engaging projection capable of being locked with the feed holes of the continuous recording paper. The swingable arm is swung in association with the movement of the transfer charger or fixing roller, which can be retracted from the operational position when no printing operation is performed. Thus, the engaging projection is engaged with the feed hole of the continuous recording paper to thereby regulate the movement of the continuous recording paper.