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3-5
3.3 PAPER FEED CHARACTERISTICS
z The bipolar chopper driving method should be used for driving.
z Any type of design for the drive circuit other than the example described in Section 3.4.1 may
affect the standard function of the printer.
z Paper is fed in the forward direction when the motor shaft is rotating anticlockwise as seen
from the motor gear side.
z The motor is driven by a 2-2 phase excitation method and feeds paper by 0.125 mm
(equivalent to a single dot pitch) every one step of the motor drive signal.
z To prevent deterioration in print quality due to backlash of the paper feed system, the motor
should be rotated 16 steps in the reverse direction, then 16 steps in the normal direction
during initialization.
z During paper feed, the motor should be driven at 1760 pps through the motor acceleration
control. As exceptions, when using the LTPF347 under 0°C to 10°C in temperature, drive it at
1200 pps or less. At dynamic division driving, do not use it more than 1200 pps.
z During printing, the motor drive frequency should be adjusted so that the head activation pulse
width does not exceed the motor step time. (For details, see CHAPTER 5 DRIVE METHOD.)
z If the motor is continuously driven at less than 450 pps continuously, noise and/or paper
sticking may occur.