2. Operationa. Turning On and Off the MotorThe delivery motor drive command (DMD) serves to turn on and off the motor.When the DMD command goes ‘0’, pulse signals (A, A*, B, B*) are sent by the motordrive circuit to the delivery motor drive circuit. In response, the motor drive circuitgenerates drive pulse commands (DMA, DMA*, DMB, DMB*) to rotate the deliverymotor.b. Controlling the Direction of Rotation of the MotorThe delivery motor rotation command (DMRON) is used to change the order in whichdrive pulse signals are generated, thereby controlling the direction of rotation.When the DMRON command is ‘1’, the motor rotates in the direction used to reversecopy paper.c. Controlling the Speed of Direction of the MotorThe delivery motor clock command (DMCLK) is used to control the speed of rotationof the motor.The copier controls the rotation of the motor as follows so that the speed of thedelivery motor is as follows according to mode of delivery/reversal and the length of copypaper.For delivery: 180 mm/secFor reversal: 360 mm/sec (for copy paper 216 mm or less in feeding direction)180 mm/sec (fro copy paper in excess of 216 mm in feeding direction)d. Controlling the Drive Torque of the MotorThe drive torque of the motor varies according to the level of the drive current, andthe level of the drive current is switched by the delivery motor current control command(DMI1, DMI2).During delivery, the DC controller sends DMI1 command to the delivery motor drivecircuit on the motor controller PCB; during reversal, it sends DMI2 command. Thedelivery motor drive circuit increases the drive current it generates in response to DMI2command.During reversal, the copy paper delivered by the delivery assembly is pulled into themachine and, therefore, a lager load than during delivery is imposed on the deliverymotor; for this reason, the drive current is increased to raise the drive torque of the motor.6-10CHAPTER 6 FIXING SYSTEMCOPYRIGHT © 1997 CANON INC. CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
