More particularly, the present invention relates to a paper thickness detecting apparatus for detecting a paper thickness on the upper portion of a holder friction and a friction roller driving cam for driving a friction roller, Even if two sheets of paper are fed in a duplicate, the friction roller driving cam is detected by the automatic paper thickness detecting device and a gap is formed between the friction roller and the feed roller, so that two sheets of paper are automatically discharged, The time loss is reduced and the lifetime of the device is extended, thereby maximizing the satisfaction of the user.
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