Smart media hanger with media width detection
The present invention embraces a method and apparatus for providing feedback to a user on the status of media or ribbon of a printer. The feedback may be provided by incorporating a feedback mechanism in a hanger of a printer. The printer may be a thermal printer, but may be another type of printer. The feedback mechanism of the printer may be designed to work with one or more sensors to provide a feedback loop so that without an input from a user, the printer is able to detect the presence/absence of media or ribbon, as well as determine the width of the loaded media or ribbon. In another embodiment, the feedback mechanism is able to determine the weight of the roll of media or ribbon and hence determine the quantity of media or ribbon available on the hanger.
1. A printer comprising:
a housing;
a hanger having a top surface and open portion below the top surface;
a plurality of moveable buttons located on a top of the hanger;
a plurality of flaps located below the top surface of the hanger, wherein each of the plurality of flaps is associated with a corresponding one of the plurality of moveable buttons;
each of the plurality of flaps being in an open state or a closed state based on a position of a roll of media or ribbon loaded on the hanger;
one or more sensors that determine a state of at least one of the plurality of flaps and output at least one signal corresponding to the state; and
a processor for processing the at least one output signal to determine at least one of a presence of the roll of media or ribbon loaded on the hanger and a width of the roll of media or ribbon loaded on the hanger.
2. The printer as in claim 1 , wherein, the one or more sensors comprise a reflective sensor.
3. The printer as in claim 2 , wherein, the reflective sensor transmits a first light signal through the open portion of the hanger, wherein, the first light signal reflects off a first flap in the open state causing a generation of a second light signal.
4. The printer as in claim 3 , wherein, the reflective sensor receives the second light signal with a different light intensity, depending on a location of the first flap, allowing a determination of a status of the roll of media or ribbon loaded on the hanger.
5. The printer as in claim 3 , wherein, the reflective sensor receives the second light signal, and based on a measured time of flight determines if the media or ribbon is loaded on the hanger and/or determines the width of the media or ribbon loaded on the hanger.
6. The printer as in claim 2 , wherein, the reflective sensor is located at one end of the hanger.
7. The printer as in claim 1 , wherein, if the roll of media or ribbon is not loaded on the hanger, the plurality of moveable buttons does not engage the plurality of flaps causing the open state for the plurality of flaps.
8. The printer as in claim 1 , wherein, if the roll of media or ribbon is loaded on the hanger, the plurality of moveable buttons underneath the roll of media or ribbon engage a corresponding plurality of flaps causing the closed state for the plurality of corresponding flaps.
9. The printer as in claim 1 , wherein, the one or more sensors comprise a plurality of transmissive sensors, wherein, each transmissive sensor includes a light emitter and a light receiver.
10. The printer as in claim 9 , wherein, each of the plurality of transmissive sensors transmits a light signal via the light emitter, and wherein,
if the light signal of each of the plurality of transmissive sensors is in proximity to one of the plurality of flaps in an open condition, then each of a plurality of light receivers do not receive the light signal from the light emitter and generate a first signal,
if the light signal of each of the plurality of transmissive sensors is in proximity of the one of the plurality of flaps in a closed condition, then the each of the plurality of light receivers receive the light signal from the light emitter and generate a second signal.
11. The printer as in claim 10 , wherein, a number of first or second signals received by the plurality of transmissive sensors determines at least one of the presence and width of the roll of media or ribbon.