Linear Encoders vs. Rotary Encoders

Encoders are very important tools in the operation of accurate plotters and digital systems. Encoders locate the position of the print head during operation allowing the DataScreen software to image accurately. The DataScreen comes equipped with one of two types of encoders depending on the imaging requirements. The two types are rotary and linear encoder.

Rotary encoders are used on the standard DataScreen machines for textile printers and others outputting mostly vector files and coarse hafltones. By definition, rotary encoders read rotationally at the drive mechanism. If there is any backlash or "slop" in the drive mechanism, rotary encoders cannot adjust to a new accurate printhead position.

Linear encoders read the position of the printhead directly from the beam of the plotter as the DataScreen is in use. Because of the proximity of the encoder to the printhead, a signal is sent to the software to make adjustment to the print position if necessary. Linear encoders are more accurate than rotary encoders and are recommended for fine halftones and for type down to 6 and 8 points.