Xerox 8500DN Service Manual - Page 43
Printhead, Tilt Gear, Tilt Gear Engaged, Printhead Restraint, DM Cam Gear
UPC - 095205022063
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Drum Theory of Operation Printhead Restraint DM Cam Gear Printhead Tilt Gear (Engaged) Tilt Gear s8500-015 In the print position (0 degrees), the Printhead is forward and rests against the right and left head-to-drum buttons. The head-to-drum buttons define the space between the jet stack and the drum. When the Process Drive is activated, it drives the Drum Maintenance Camshaft to engage the tilt gear train. The tilt cam tilts the Printhead into the print position. The cam is combined with a missing tooth gear that allows the cam to be inactive in the print position, freeing the Process Drive to perform other printer operations. The cam has a latching mechanism to unlatch and latch the missing tooth gear to engage the Printhead tilt drive train. The cam's latching mechanism also holds the tilt gear in place. A leaf spring applies constant pressure to engage the gear when the latching mechanism is released. The arm of the latching mechanism is inside the frame; the rest is visible, outside the frame. Arrows located on the latching mechanism and on the frame indicate when the Printhead is in print position. When the arrows on the latching mechanism and frame align, the Printhead is in the print position and the tilt gear disengages from the Process Drive. Phaser 8500/8550/8560 printers have a solenoid (Head Tilt Solenoid) that is actuated and deactuated when the tilt cam gear rotates to the respective engaged and disengaged positions. The latching mechanism is actuated by a small movement of the wiper coupled with the Head Tilt Solenoid. The action of the solenoid ensures that the Head Tilt Gear engages the tilt drive gear. Through a follower gear, the compound gear drives the tilt cam gear clockwise. A cam follower, mounted on the lower end of the tilt arm, follows the rotating tilt cam gear and tilts the Printhead. After one revolution of the tilt gear, the latching mechanism is pulled back into position by the return spring in the 8400, and by the Head Tilt Solenoid in the 8500/8550/8560. Phaser 8400/8500/8550/8560 Color Printer Service Manual 2-11