(57) @ This invention provides a printer, having an elongate platen and a print head carriage
adapted for relative movement therebetween longitudinally of the platen, in which
a position indicator ascertains the position and direction of motion of said carriage
longitudinally of said platen. The indicator comprises an optical position encoder
rotatably mounted on an axis fixed longitudinally of said platen, and a carriage position
responsive means connected to said carriage and said encoder to transmit said relative
movement to said encoder to rotate said encoder in synchronism with said relative
movement. The encoder has a pattern of detectable indicia and a detector is responsive
to said indicia to provide a signal indicative of said position.
|
|
