xiaolabaDIY 的部落格

EPSON's inkjet printer, disassembled couple years ago. Stepper of shaft drive for paper feeding, open-loop control, cost of stepper should be higher than DC motor


The Stepper




today, this LEXMARK Lexmark Z1320 彩色噴墨印表機, DC motor is used for drive of paper feeding, low cost



CPU of this LEXMARK Lexmark Z1320 彩色噴墨印表機, ARM inside



DC motor is used for drive of paper feeding with this incremental shaft encoder for close-loop control in software of which is almost cost nothing



the disc of this encoder



the photo sensor module of this encoder



the PCB of photo sensor module of this encoder



the basis of how incremental shaft encoder works, review and refresh, it does match why the sensor module have 6 pins
LED, light source, 2 pins
power, + / -, 2 pins
output, 2 phases, 2 pins





test rig for this encoder, RED LED & quadrature output is in action






conclusion:
5V system and 3V3 interface, no sure whether it is open-collector or CMOS, but it is possible to uses the debug interface for further examination.