Monitoring system for dispenser

1. A dispenser for dispensing a sheet material, comprising:

a roll support for supporting a supply of the sheet material;

a feed roller arranged along a feed path of the sheet material downstream from the supply of sheet material, the feed roller engaging and pulling the sheet material from the supply of sheet material for feeding along a dispensing path upon the rotation of the feed roller;

a controller in communication with the feed roller and including programming for monitoring rotation of the feed roller during a dispensing cycle for feeding a selected length of the sheet material from the supply of sheet material; and

a material supply monitoring system in communication with the controller operable to detect a number of rotations or an angle of rotation of the supply sheet material during at least a series of dispensing cycles, and based upon changes in such signals, a remaining diameter of the supply of sheet material is substantially dynamically determined after at least each of the series of dispensing cycles, the material supply monitoring system including:

at least one magnet configured to be operatively connected to the supply of sheet material so as to be rotatable therewith; and

at least one sensor mounted on the roll support and located adjacent the supply of sheet material in a position to detect variations or changes in a magnetic field generated as the at least one magnet passes the at least one sensor when the supply of sheet material is rotated.

2. The dispenser of claim 1 , further comprising at least one pressing roller arranged along the feed path and rotatable with the feed roller such that the sheet material is engaged and pulled between the at least one pressing roller upon rotation of the feed roller.

3. The dispenser of claim 1 , further comprising a pair of spaced pressing rollers adjacent and in driven contact with the feed roller so as to rotate with rotation of the feed roller, and wherein the sheet material is engaged and pulled between the pressing rollers and feed roller upon rotation thereof.

4. The dispenser of claim 1 , wherein the at least one sensor comprises a switch, hall element, or proximity sensor.

5. The dispenser of claim 1 , further comprising a drive motor coupled to the feed roller and in communication with the controller, which controls operation of the drive motor to drive the rotation of the feed roller for feeding the selected length of sheet material.

6. The dispenser of claim 5 , further comprising one or more sensors operable to detect the presence of an object, and upon detection of the object, activating the drive motor for feeding the selected length of sheet material.

7. The dispenser of claim 1 , further comprising a sheet material detection sensor arranged along the feed path of the sheet material and configured to detect removal of the selected length of sheet material.

8. The dispenser of claim 7 , wherein the sheet material detection sensor is activated upon a detected rotation of the supply sheet material.

9. The dispenser of claim 1 , further comprising a plurality of supplies of sheet material, wherein the material supply monitoring system is operable to detect rotations or an angle of rotation of each of the plurality of supplies of sheet material.

10. The dispenser of claim 1 , wherein the material supply monitoring system is operable to verify that one or more of the plurality of supplies of sheet material has been loaded into the dispenser.

11. A method of operating a paper dispenser, comprising:

rotating a feed roller to feed a length of paper from a supply roll;

detecting a number of rotations of the supply roll for feeding the length of paper using a material supply monitoring system, the material supply monitoring system including at least one magnet configured to be operatively connected to the supply roll so as to be rotatable therewith; and at least one sensor mounted on a roll support that supports the supply roll and located adjacent the supply roll in a position to detect variations or changes in a magnetic field generated as the at least one magnet passes the at least one sensor when the supply roll is rotated;

determining a number of rotations of a motor driving the rotation of the feed roller per rotation of the supply roll during feeding of the length of paper; and

determining a remaining paper diameter of the supply roll based upon the number of rotations of the motor per rotation of the supply roll and an amount of paper dispensed per rotation of the motor.

12. The method of claim 11 , wherein rotating the feed roller comprises operating the motor to drive the feed roller for a number of rotations sufficient to feed a selected length of paper or until a stop signal is received by a controller of the dispenser.

13. The method of claim 11 , further comprising comparing the remaining paper diameter to a threshold value and directing a low paper condition if the threshold value exceeds the remaining paper diameter.

14. The method of claim 11 , further comprising activating the motor to drive the feed roller for feeding the length of paper upon detection of an object with one or more sensors.