Importance

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Abstract

A jam detector comprising a timer, a comparator for comparing time interval data preset in the timer with time interval data which indicates the time interval required for conveying a transfer paper sheet from a first position to a second position, an operation control device for computing updated time interval data to be reset in the timer, and a RAM for storing the computed data. When a plurality of transfer paper sheets are present along the conveyance path extending from the first position to the second position, the conveying time interval data of the first transfer paper sheet is set in the timer. When the first transfer paper sheet reaches the second position, conveying time for the second transfer paper sheet to reach from the first position to the current position is computed by utilizing the data preset in the timer. The conveying time for the second transfer paper sheet to reach from the current position to the second position is computed, and is reset in the timer. This process is repeated for each succeeding transfer paper sheet.

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First Claim