HP 2500c Service Manual - Page 131
Output, Reverse Control
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Paper Paths and Components Output Reverse Control Primary bin media pick is initiated by reverse motion of LF motor for a specified (small) angle. As our output drive is connected directly to LF motor , star wheels tend to rotate in reverse direction . This pulls back the media which is to be ejected to the print zone which may cause jamming. (Note: Media ejection is done simultaneously along with Pick to increase throughput). Hence we need a mechanism which should be able to disengage output star wheel drive during the reversal of LF motor. This is taken care by introducing Rocking gear as a part of the output drive . Rock gear engages with its mating gear only when LF motor rotates in forward direction and disengages in reverse direction. Rock gear is mounted on the arm-rocker which is stopped in defined positions in both directions by Left-support wall. Arm-rocker disengagement angle is 20°. Gear-OP3 Gear-Drive roller Gear1-LF LF Motor LF Motor Pinion Gear-OP1 Stopper (Left support) Gear-OP2 Gear-Rock (disengaged) Arm-Rocker (disengaged posn.) Functional Overview 6-11