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quick review and see what is available,
LEXMARK Lexmark Z1320 彩色噴墨印表機, NT$660, bought last night, disassembled
Drive design of paper feeding is being changed, most of aged design similar with an EPSON inkjet printer disassembled couple years ago, they used the stepper without feedback and it acts as open-loop. cost of stepper is higher than a simple DC motor. now a day, many low cost inkjet printer, the design has been changed to uses simple DC motor to drive the shaft for paper feeding.
EPSON's age design, stepper + open loop drive
this Z1320, DC bush motor, for shaft driving
the incremental shaft encoder assembly for close-loop control
the grid of the encoder disc
the ARM CPU of this Z1320
the photo sensor module
the PCB of photo sensor module
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