Device for controlling rotation of stepping motor

摘要

This invention relates to a device for controlling the rotation of the stepping motor in a printer. The device comprises a U-shaped frame member fixedly secured to the carriage of the printer and having opposing light emitting and receiving elements formed by the opposing legs of the frame member and a detector fitted on the drive shaft of the stepping motor for rotation with the drive shaft so as to intervene between the light emitting and receiving elements to interrupt the passage of the light from the light emitting element to the light receiving element to thereby turn the light receiving element OFF and also clear the light emitting and receiving elements to allow the light to pass from the light emitting element to the light receiving element so as to turn the light receiving element ON as the detector rotates.