HP 2500c Service Manual - Page 141

Paper Paths and Components Dual Bin Pick And Feed Mechanism Pick And Feed Schematic INPINCH ROLLER DRIVE ROLLER DIRECTION TROUGH 1 TROUGH 2 COF ~ 1.6 (BET ROLLER AND PAPER) GRAVITATIONAL FORCE PAPER PATH PICK ROLLER DIRECTION PICK FORCE SEPARATION SURFACE COF ~ 0.6 (BET SEP. PAD AND PAPER) Figure E The Dual Bin Pick And Feed The pick roller is mounted to a pivot arm such that when the paper tray is pushed into its position, the pick roller and the pivot arm will fall on the paper surface, as shown in Figure E. A DC motor is used to supply power to provide the pick force (µN, N=mg) to drive the top media sheet(s) against the separation surface in front of the tray. The angle of the separation surface with respect to the horizontal is in such that it ensures only one sheet of media is fed through. The media is fed continuously until it reaches the set of pinch rollers at the drive roller, before the drive roller takes over the driving force. Functional Overview 6-21