Brother International FAX 275 Service Manual - Page 18
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2.3.2 Description of planetary gear system The planetary gear train consists of the sun gear 18/82, two planet gears 20, arm A, and arm B, as shown below. Motor gear Stopper of arm A Sun gear 18/82 Planet gear 20A Planet gear 20B Arm B Arm A Planetary Gear System If the motor rotates, the sun gear 18/82 rotates so that the rotational torque is transmitted to the engagement between the sun gear and the planet gears 20. Since the arms and planet gears are so designed that the moment of the arms is less than that of the planet gears, the arms turn around the center shaft in the same direction as the sun gear 18/82. If the planet gear(s) becomes engaged with any other gear so that the arm cannot turn any more, the rotational torque of the sun gear 18/82 is transmitted to that planet gear. Accordingly, the planet gear starts rotation in the opposite direction of the sun gear 18/82.