Conditions Required for Accurate Multifeed Detection

Multifeed is an error where two or more sheets are fed through the ADF at once. It is also called a "multifeed" when the difference in length between documents are detected.
The overlapping of documents, length of the documents, or the combination of both is checked for a multifeed detection. The following conditions are required for an accurate detection.

(1) Detecting overlapping documents

• Paper weight: 40 to 209 g/m² (11 to 56.1 lb) (0.05 to 0.250 mm)
• Do not punch holes anywhere within a 35 mm (1.38 in.) area at the center of a document. Refer to Area Not to Be Perforated in "Documents for Scanning".
• Do not attach another document to a document with glue or any other adhesive anywhere within a 50 mm (1.97 in.) area at the center of a document. Refer to Fig. 1.

(2) Length Detection

• When scanning a batch of documents, load documents of the same length in the ADF paper chute (feeder).
• Variance in document lengths: 1% or less
• Do not punch holes anywhere within a 35 mm (1.38 in.) area at the center of a document. Refer to Area Not to Be Perforated in "Documents for Scanning".

(3) Overlapping and Length Detection

• When scanning a batch of documents, load documents of the same length in the ADF paper chute (feeder).
• Paper weight: 40 to 209 g/m² (11 to 56.1 lb) (0.05 to 0.250 mm)
• Variance in document lengths: 1% or less
• Do not punch holes anywhere within a 35 mm (1.38 in.) area at the center of a document. Refer to Area Not to Be Perforated in "Documents for Scanning".
• Do not attach another document to a document with glue or any other adhesive anywhere within a 50 mm (1.97 in.) area at the center of a document. Refer to Fig. 1.

Fig. 1

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Important:

The above condition applies when the document is set to the center of the pick roller width. When you use detection by overlapping, scanning thick documents such as plastic cards will be falsely detected as multifeed. To scan such documents, disable the multifeed window display function of the scanner driver, the Intelligent Multifeed function, or the multifeed detection setting.

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HINT:

The accuracy of a multifeed detection may drop depending on the document type. Multifeed cannot be detected for the top 30 mm (1.18 in.) of a document. For the shaded area in Fig. 1, you can also specify a length not to detect multifeeds in the Software Operation Panel. Open the Software Operation Panel in the following procedure: Windows Vista/Windows Server 2008/Windows 7 Select [Start] menu → [All Programs] → [fi Series] → [Software Operation Panel]. Windows Server 2012/Windows 8 Right-click the Start screen, and select [All apps] on the app bar → [fi Series] → [Software Operation Panel]. Windows Server 2012 R2/Windows 8.1 Click [↓] on the lower left side of the Start screen and select [Software Operation Panel] under [fi Series]. To display [↓], move the mouse cursor. Windows 10 Select [Start] menu → [All Apps] → [fi Series] → [Software Operation Panel].

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