A pair of ultra-sound sensors are mounted in the paper registration unit, one below (emitter) [A] and one above (receiver) [B] the paper feed path.

When the paper passes through the gap between the sensors, the signal between them detects the original with sound waves and converts the reading to voltage, and if the output level is determined to exceed threshold for the type of original being fed, paper feed stops.

  • When the paper passes between the sensors, an ultra-sound wave from the emitter sensor below passes through the paper to the receiver above.
  • The receiver converts the signal generated by the vibration of the signal against the paper to an electrical pulse and checks its level.

  • If a double feed occurs, the space between the sheets will generate a lower signal. When the emitter detects this lower signal (lower than that of a single sheet) it causes the machine to issue Jam Code J099 (double-feed detected) and the paper is fed to the purged paper tray.
    Double-feed Related SP Code

    SP No.

    Name

    Range/Settings

    SP1302-001 to 012

    Double Feed Detect Trays 1 to T4

    [0 to 1/1/1]

    1: On

    0: Off

    SP1303-001

    Dbl-Feed Detect After Dbl-Feed Detect

    [0 to 2/1/1]

    0: Jam alarm

    1: Purge tray

    2: Proof tray