Conditions Required to Accurately Detect Overlapped Documents (Multifeed)

Multifeed is an error that occurs when two or more sheets are overlapped and fed at once.

Overlapped documents are detected with the ultrasonic sensor or according to the difference in length of the documents.

The following conditions are required for an accurate detection.

Detecting Overlapped Documents with the Ultrasonic Sensor

  • Paper weight: 27 to 413 g/m2 (7.2 to 110 lb)

  • Do not punch holes within 35 mm (1.38 in.) over the center of the document.

    Refer to Fig. 1 in Area Not to Be Perforated.

  • Do not attach other documents with glue or other adhesive within 35 mm (1.38 in.) over the center of the document.

    Refer to Fig. 1 in Area Not to Be Perforated.

Detecting Overlapped Documents according to the Difference in Length

  • Load the documents of the same length in the ADF paper chute (feeder).

  • Variation in document lengths: 1% or less

  • Do not punch holes within 35 mm (1.38 in.) over the center of the document.

    Refer to Fig. 1 in Area Not to Be Perforated.

Detecting Overlapped Documents with the Ultrasonic Sensor and According to the Difference in Length

  • Load the documents of the same length in the ADF paper chute (feeder).

  • Paper weight: 27 to 413 g/m2 (7.2 to 110 lb)

  • Variation in document lengths: 1% or less

  • Do not punch holes within 35 mm (1.38 in.) over the center of the document.

    Refer to Fig. 1 in Area Not to Be Perforated.

  • Do not attach other documents with glue or other adhesive within 35 mm (1.38 in.) over the center of the document.

    Refer to Fig. 1 in Area Not to Be Perforated.

ATTENTION

  • The above condition applies when the document is set to the center of the pick roller width.

  • When an option to detect overlapping with the ultrasonic sensor is selected, scanning a thick document such as a plastic card will be falsely detected as overlapping of documents.

    In that case, specify one of the following settings and try scanning again.

    • Use the intelligent multifeed detection function.

    • Disable the setting to detect overlapped documents by the ultrasonic sensor.

    • Scan with Manual Single Mode.

HINT

  • The accuracy of detection for overlapped documents may drop depending on the document type.

    Overlapping cannot be detected for the top 30 mm (1.18 in.) of a document in the feeding direction.

  • On the [Multifeed Detection Area] screen, you can specify an area not to detect overlapping of documents within the area described in Fig. 1 in Area Not to Be Perforated.

    The [Multifeed Detection Area] screen can be displayed in the following procedure:

    Settings → [Scanner Settings] → [Paper Source/Feeding] → [Multifeed Detection Area]

    When using the Software Operation Panel, refer to Settings Related to the Detection for Overlapped Documents (Multifeed).