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3.9 Paper Feed Motor Specifications
Item Specifications
Type PM type stepping motor
Drive method 2-Phase excitation unipolar method
Terminal voltage 24 VDC ± 1.2 V (for drive), 4.2 VDC (when holding)
Peak current Max. 0.7 A
Average current About 0.28 A
Holding current About 0.08 A
Amount of paper feed
1/144 inch per 1 step
Feed method Forward feed only
Excitation signal a. When paper feed amount is less that 4 steps.
Set to 350 pps drive.
b. When paper feed amount is over 5 steps and less than 8 steps. Set the slow-
down area so that the final 2 steps become 300 pps and 200 pps. The other
areas are set to 350 pps drive.
c. When paper feed amount is over 9 steps and less than 18 steps. Set the inital
4 steps so that they become 350 pps (slow-up area). Set the slow-down area
so that the final 4 steps become 500 pps, 400 pps, 300 pps, and 200 pps.
The other areas are set to 550 pps drive.
d. When paper feed amount is over 19 steps.
Set the initial and final 4 steps so that they become 350 pps. The other areas
are set to 550 pps drive.
VH 24 V D1 DSM1D1 (HITACHI)
TA1 µPA1428AH (NEC)
R2 to R3
10 kΩ
TR1 2SB1359 Compatible D1 DSM1D1 (Hitachi)
TR2 2SC1740 Compatible IC SN74L04
Fig. 3-16 Drive circuit of paper feed motor (example)
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