Input handling for media processing devices

1. A media processing device comprising:

a hopper for supporting a plurality of media units, the hopper including a biasing assembly for biasing the media units toward an outlet of the hopper;

an input roller at a slot inlet configured to accept a single media unit into the hopper for placement adjacent to the outlet;

a pick roller at the outlet for dispensing one of the media units from the hopper to a media processing path;

a motor having an output shaft;

a primary drivetrain segment connecting the output shaft with the pick roller;

an auxiliary output selector connected to the primary drivetrain segment and switchable between a first output configuration and a second output configuration;

a first auxiliary drivetrain segment connecting the auxiliary output selector with the input roller;

a second auxiliary drivetrain segment connecting the auxiliary output selector with a release member configured to disengage the biasing assembly from the plurality of media units; and

a selector input movable between (i) a first position for switching the auxiliary output selector to the first output configuration to couple the primary drivetrain segment with the first auxiliary drivetrain segment; and (ii) a second position for switching the auxiliary output selector to the second output configuration to couple the primary drivetrain segment with the second auxiliary drivetrain segment.

2. The media processing device of claim 1 , the auxiliary output selector including:

an input rotational drive element driven by the primary drivetrain segment;

a first output rotational drive element connected to the first auxiliary drivetrain segment;

a second output rotational drive element connected to the second auxiliary drivetrain segment;

a selector disc driven by the input rotational drive element and movable by the selector input to engage one of (i) the first output rotational drive element in the first output configuration and (ii) the second output rotational drive element in the second output configuration.

3. The media processing device of claim 2 , the auxiliary output selector further including:

a selector drive shaft fixed to the input rotational drive element and engaged with the selector disc via a one-way clutch;

the first and second output rotational drive elements mounted on the selector drive shaft to rotate freely;

the selector disc movable axially along the selector drive shaft.

4. The media processing device of claim 3 , further comprising:

a hopper door rotatable about a joint adjacent to the auxiliary output selector between an open position permitting access to the hopper and a closed position;

the selector input comprising a cam formed on the joint, the cam configured to engage the auxiliary output selector to place the selector disc in the first output configuration when the door is in the closed position, and to place the selector disc in the second output configuration when the door is in the open position.

5. The media processing device of claim 4 , the auxiliary output selector further including a cam follower mounted between the cam and the selector disc; the cam follower configured to engage with the cam to move the selector disc between the first and second output configurations.

6. The media processing device of claim 4 , further comprising:

a door sensor configured to detect opening of the hopper door; and

a controller in communication with the door sensor and the motor, the controller configured to initiate operation of the motor to drive the output shaft in a first direction responsive to detection that the hopper door is open.

7. The media processing device of claim 6 , the release member comprising a sector gear including a protrusion for engaging the biasing assembly.

8. The media processing device of claim 7 , further comprising:

a release member limit sensor configured to detect that the release member has reached a position disengaging the biasing assembly;

the controller configured, responsive to the detection, to cease operation of the motor.

9. The media processing device of claim 4 , further comprising:

an input motion sensor configured to detect rotation of the input roller caused by insertion of a media unit at the input slot; and

a controller configured, responsive to the detection of input roller rotation, to operate the motor to drive the output shaft in a first direction.

10. The media processing device of claim 9 , the first auxiliary drivetrain segment including a rotational drive element having encoder surfaces detectable by the input motion sensor.

11. The media processing device of claim 9 , the controller further configured, a predetermined operational period after initiating operation of the motor in the first direction, to operate the motor to drive the output shaft in a second direction opposite the first direction.

12. The media processing device of claim 11 , the primary drivetrain segment including a pick rotational drive element coupled to the pick roller via a one-way clutch, the pick rotational drive element configured to drive the pick roller when the output shaft is driven in the second direction, and to rotate relative to the pick roller when the output shaft is driven in the first direction.

13. The media processing device of claim 12 , the pick rotational drive element configured to drive the input rotational drive element of the auxiliary output selector in both the first and second directions.

14. The media processing device of claim 1 , each of the drivetrain segments including a set of linked rotational drive elements.

15. The media processing device of claim 14 , each of the rotational drive elements comprising one of a gear and a pulley.

16. The media processing device of claim 1 , further comprising:

a flexible gate at the outlet, the flexible gate configured to deflect toward the media processing path responsive to the outer media unit being driven into the flexible gate by the pick roller, permitting the outer media unit to be dispensed from the hopper.