HP Color LaserJet CM4730 Service Manual - Page 215

the multiple-fed media to be separated and pushed back to the cassette. Figure 4-39 Media lifting on page 195 illustrates this process. Cassette feed roller Cassette pick-up roller Driving force transmitted from cassette feed roller Paper Cassette separation roller Driving force transmitted from the pick-up motor through the torque limiter Normally Multiple-feed Figure 4-39 Media lifting Skew correction The skew correction mechanism compensates for the skew of feeding media. This MFP uses the registration shutter method to avoid decreasing throughput. 1. When the media is fed to the registration roller, the leading edge of the media hits the registration shutter to compensate for the skew feeding. 2. The media is warped as the feed roller keeps pushing the media with the condition that the media hit the registration shutter. 3. The stiffness of the media being warped lifts up the registration shutter and the media goes through the shutter. The skew-feed is corrected without decreasing throughput. ENWW Pickup/feed system 195