The operational sequence of the lift-up is as follows: 1. The lifter motor rotates to raise the lifter. 2. The lifter motor stops when the PF cassette media stack surface sensor detects the paper surface. 3. The lifter motor rotates again when the PF cassette media stack surface sensor detects that the stack surface lowers during a print operation. The paper feeder controller determines a PF cassette lifter motor failure and notifies the formatter through the DC controller when the PF cassette media stack surface sensor does not detect the paper surface within a specified period from when the PF cassette lifter motor starts rotating.
500-sheet paper feeder cassette media-presence detection The paper feeder controller detects whether the paper is loaded in the cassette by monitoring the PF cassette media out sensor. The cassette media-presence detection is not performed during Sleep mode. The paper feeder controller determines a media-absence and notifies the formatter through the DC controller when the PF cassette media out sensor does not detect the paper. 500-sheet paper feeder cassette multiple-feed prevention The paper feeder uses a PF cassette separation roller to prevent the multiple sheets of paper from entering to the product.
The PF cassette separation roller transmits its driving force so that the roller rotates in the same direction with the PF cassette feed roller. ● When one sheet of paper is picked up, driving force from the PF cassette feed roller transmits through the single sheet of paper because the torque limiter functions and the PF cassette separation roller follows the PF cassette feed roller. Therefore, single sheet is fed into the product. ● When multiple sheets of paper are picked up, driving force from the PF cassette feed roller becomes weak due to a low friction between the sheets. The PF cassette separation roller rotates ENWW 500-sheet paper feeder (Tray 4) 55