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Main Unit Feed Motor Control Circuit
The main unit feed motor drives the transmission shaft that rotates the transfer belt. It
pulls the paper, which is sent at the speed controlled by the tractor motor or drum
motor. Since paper tends to go slack near the perforation, the rotation is set about
5% faster than that of the tractor motor or drum motor.
In order to achieve the required degree of control, a compact stepping motor is used
as the main unit feed motor, and speed control is performed by sending clock pulses
from the CPU to the motor.
3–48
Timer interrupt
Stepper motor driver circuit
(constant-current chopper type)
Figure 3–27. Feed Motor Control Block Diagram
CPU
Clock pulse
generation
Feed motor
Electrical System and Adjustments
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