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Automatic towel dispenser

  • US 10,694,900 B2
  • Filed: 02/22/2019
  • Issued: 06/30/2020
  • Est. Priority Date: 06/06/2009
  • Status: Active Grant
First Claim
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1. A sheet material dispenser comprising:

  • a housing defining an interior space sized to receive a sheet material roll therein;

    an outlet for dispensing sheet material from the sheet material roll;

    a sensor positioned proximate the outlet and configured to sense a leading edge of the sheet material from the sheet material roll;

    a motor assembly that drives dispensing of the sheet material from the dispenser; and

    a controller configured to perform a length learn calibration by;

    causing the motor assembly to dispense a first predetermined length of the sheet material through the outlet;

    causing, in response to expiration of a predetermined period of time and based on sensor data from the sensor, the motor assembly to retract the sheet material through the outlet such that the leading edge of the sheet material is retracted within the housing;

    determining a retracted length of the sheet material corresponding to the amount of sheet material that was retracted through the outlet; and

    determining a second predetermined length of sheet material to dispense through the outlet during future dispenses based on the determined retracted length and the first predetermined length.

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