The cleaning pressure mechanism is shown above. When the cleaning solenoid [A] is energized, it turns the cleaning solenoid lever [B] clockwise (rear view). Due to the pull of the cleaning blade pressure spring [C], the pressure arm [D] also turns clockwise and pushes the cleaning blade lever [E] up. The cleaning blade holder then rotates and the cleaning blade [F] presses against the drum. Blade pressure is limited by the pressure spring [I]. The cleaning blade is mounted on the blade bracket with a single swivel screw [G] at its exact center. With this type of mounting, the blade sets parallel and applies even pressure automatically. Also since pressure is transmitted to the center, a single pressure spring is used. The blade scraper [H] is mounted in contact with the bottom side of the cleaning blade. When pressure is applied to the cleaning blade, it is forced forward and bends at its outer edge. When pressure is released from the blade, it snaps back to its original position. Simultaneously, the mylar of the blade scraper scrapes off the excess toner and paper dust from the edge of the blade. This helps to maintain efficient cleaning. The blade pressure is released when there is no key input for 1 minute, 10 seconds after a paper misfeed occurs, or when the safety switches open.
