appendix 2 double-feed detection conditions

    there are three double-feed detection modes: document thickness, document length, and both document thickness and length. the following conditions must be satisfied in each of these detection modes.

    1 detection by document thickness

    sheets of the same thickness shall be set in the adf at a time.

    (1)document thickness: 0.065 to 0.15mm

    (2)printed area: 12% or less

    (3)no black printed areas are allowed at the center area (26 x 10mm) at the leading edge of the document.

    (4)punched holes are not allowed within 35mm of the vertical center line of the document.

    (5)the deviation in the amount of the light transmitted through background areas must not be less than 10%.

    2 detection by document length

    sheets of the same length shall be set in the adf at a time.

    (1)document length deviation: 1% or less

    (2)printed area: 12% or less

    (3)no black printed areas are allowed at the center area (26 x 10mm) at the leading edge of the document.

    (4)punched holes are not allowed within 35mm of the vertical enter line of the document.

    (5)the deviation in the amount of the light transmitted through background areas must not be less than 10%.

    3 detection by document thickness and length

    sheets of the same thickness and length shall be set in the adf at a time.

    (1)document length: 0.065 to 0.15mm

    (2)document length deviation: 1% or less

    (3)printed area: 12% or less

    (4)no black printed areas are allowed at the center area (26 x 10mm) at the leading edge of the document.

    (5)punched holes are not allowed within 35mm of the vertical center line of the document.

    (6)the deviation in the amount of the light transmitted through background areas must not be less than 10%.

    the type and the conditions of document and the conditions sometimes cause the double-feed detection rate to drop.