Duplex ADF mechanism

1. An duplex auto-document feed mechanism, comprising:

an auto-document feedpath having a simplex feedpath portion and a duplexing feedpath portion in feeding communication with said simplex feedpath portion;

said auto-document feedpath having a media input and a media output; an input roller for feeding media disposed at said media input and an exit nip positioned near said media output;

a motor driving said input roller and said exit nip; and,

a scanning station disposed along one of said duplex feedpath portion and said simplex feedpath portion;

said exit nip having a first position wherein first and second rollers defining said exit nip are closed when receiving media during a simplex feeding procedure and open when a leading edge and trailing edge of media are passing through said exit nip simultaneously;

wherein a change of motor direction one of opens said exit nip or closes said exit nip.

2. The duplex auto-document feeding mechanism of claim 1 further comprising a cam assembly opening said exit nip and closing said exit nip.

3. The duplex auto-document feeding mechanism of claim 2 further comprising an idler housing, one of said first and second rollers rotatably connected to said idler housing.

4. The duplex auto-document feeding mechanism of claim 3 wherein said idler housing is pivotally connected within said auto-document feed mechanism for pivotal motion away from the other of said first and second rollers.

5. The duplex auto-document feeding mechanism of claim 1 further comprising a two-stage clutch mechanism.

6. The duplex auto-document feeding mechanism of claim 5 further comprising a frame and a pawl pivotally connect to said frame.

7. The duplex auto-document feeding mechanism of claim 6 wherein said two stage clutch assembly either engages or disengages an auto-compensating mechanism input gear based on a rotation of said motor.

8. The duplex auto-document feeding mechanism of claim 1 further comprising a delivery drive roller disposed between said scanning station and said exit nip.

9. The duplex auto-document feeding mechanism of claim 8 further comprising two two-stage clutches to actuate said input roller and said exit nip.

10. The duplex auto-document feeding mechanism of claim 9 further comprising multiple jogs to actuate said two two-stage clutches.

11. A duplex feed mechanism, comprising:

an auto-document feedpath having an input, an output, a simplex portion and a duplex portion;

a motor driving a plurality of rollers within said auto-document feedpath;

said plurality of rollers including an exit nip roll and a corresponding exit nip idler, the exit nip roll and exit nip idler being disposed adjacent an end of the auto-document feedpath;

one of said exit nip rollers having a first position wherein said nip is substantially closed and a second position where said nip is open;

said exit nip idler being movable by a cam;

said cam being actuated by changing direction of said motor;

a duplex delivery nip disposed within said duplex portion of said auto-document feedpath; and

a drive roller in feeding cooperation with a duplex delivery idler at a first location and an exit delivery idler at a second location, the duplex delivery idler being moveable from a first position engaging said drive roller to a second position disengaged from said drive roller.

12. A duplex feed mechanism, comprising:

an auto-document feedpath having an input, an output, a simplex portion and a duplex portion;

a motor driving a plurality of rollers within said auto-document feedpath;

said plurality of rollers including an exit nip roll and a corresponding exit nip idler, the exit nip roll and exit nip idler being disposed adjacent an end of the auto-document feedpath;

one of said exit nip rollers having a first position wherein said nip is substantially closed and a second position where said nip is open;

said exit nip idler being movable by a cam;

said cam being actuated by changing direction of said motor;

a duplex delivery nip disposed within said duplex portion of said auto-document feedpath; and

a drive roller in feeding cooperation with a duplex delivery idler at a first location and an exit delivery idler at a second location, the duplex delivery idler being moveable by a cam assembly from a first position engaging said drive roller to a second position disengaged from said drive roller.

13. A duplex feed mechanism comprising:

an auto-document feedpath having an input, an output, a simplex portion and a duplex portion;

a motor driving a plurality of rollers within said auto-document feedpath;

said plurality of rollers including an exit nip roll and a corresponding exit nip idler, the exit nip roll and exit nip idler being disposed adjacent an end of the auto-document feedpath;

one of said exit nip rollers having a first position wherein said nip is substantially closed and a second position where said nip is open;

said exit nip idler being movable by a cam;

said cam being actuated by changing direction of said motor;

a duplex delivery nip disposed within said duplex portion of said auto-document feedpath; and

a drive roller in feeding cooperation with a duplex delivery idler at a first location and an exit delivery idler at a second location, the duplex delivery idler being moveable by a cam assembly from a first position engaging said drive roller to a second position disengaged from said drive roller, and

the duplex delivery idler being moved by a two-stage clutch mechanism.

14. A duplex auto-document feed mechanism comprising:

an auto-document feedpath including a first simplex portion and a second duplex portion;

an exit nip disposed adjacent an end of the auto-document feedpath having a first roller and a second roller;

one of said first roller and said second roller moveable from a first position to a second position during a direction change of a motor;

said duplex feedpath being shorter than a length of media so that said first and second rollers are spaced apart when a leading edge and a trailing edge are positioned within said exit nip;

wherein said first and second rollers are closed when receiving media from a simplex media feed and open during a duplex media feed; and

a two-stage clutch mechanism for actuating a pick mechanism.