Conditions for 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 a different document length is detected.
Multifeed detection is performed by either checking the overlapping of documents, length of the documents, or the combination of both. The following conditions are required for an accurate detection.

1) Detection by overlapping

• Load documents of the same paper weight in the ADF paper chute.
• Paper weight: 52 to 127 g/m² (14 to 34 lb)
• Do not punch holes within 50 mm (1.97 in.) over the vertical center line of the document. See Fig.1.
• Do not attach other documents within 50 mm (1.97 in.) over the vertical center line of the document. See Fig.1.

2) Detection by length

• Load documents of the same length in the ADF paper chute.
• Variance in document lengths: 1% or less
• Do not punch holes within 50 mm (1.97 in.) over the vertical center line of the document. See Fig.1.

3) Detection by overlapping and length

• Load documents of the same paper weight and length in the ADF paper chute.
• Paper weight: 52 to 127 g/m² (14 to 34 lb)
• Variance in document lengths: 1% or less
• Do not punch holes within 50 mm (1.97 in.) over the vertical center line of the document. See Fig.1.
• Do not attach other documents within 50 mm (1.97 in.) over the vertical center line of the document. See Fig.1.

Fig. 1

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HINT:

The rate of multifeed detection may drop with some documents. Multifeed cannot be detected within 30 mm from the leading edge of the document. For the area in Fig. 1, you can also specify a length (feed direction) in the Software Operation Panel to disable multifeed detection. To open the Sofware Operation Panel; from the [Start] menu, select [All Programs] → [Scanner Utility for Microsoft Windows] → [Software Operation Panel].

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