LTPH245 datasheet(17/64 Pages) SII

17 / 64 page

3-4

3.3

PAPER FEED CHARACTERISTICS

Paper is fed in a forward direction when the motor shaft is rotating in the normal direction

(clockwise) when seen from the motor gear side.

The motor is driven by a 2-2 phase excitation, constant current chopper method and feeds

paper 0.125 mm (equivalent to a single dot pitch) every two steps of the motor drive signal.

To prevent deterioration in printing quality due to backlash of the paper feed system, the motor

should be driven 40 steps in a reverse direction and then 40 steps in the normal direction during

initialization or after backward feeding.

During paper feeding, the motor should be driven lower than the value obtained by equation (1).

Equation (1):

× 165 - 220 (pps) (max.1000 (pps) )

During printing, the motor drive frequency should be adjusted according to working conditions

such as voltage, temperature, number of activated dots, etc. (For details, see CHAPTER 5

DRIVE METHOD.)

Do not print while the motor is rotating in the reverse direction.

Table 3-2 Sample Motor Drive Frequency

Operating Voltage

Drive Frequency

(Paper feed)

4.2 V

473 pps

5 V

605 pps

6 V

770 pps

7.2 V

968 pps

8 V

1000 pps

8.5 V

1000 pps

LTPH245 Datenblatt(PDF) 17 Page - Seiko Instruments Inc