| 摘要 |
PROBLEM TO BE SOLVED: To provide a sheet feeder capable of preventing a feeding failure of overlapped feeding, etc., even against a diversified sheet by providing a separation member not to interrupt returning carriage of sheets carried in a bundle by a separation rotor even while handling and separating a sheet bundle before a retard separation means in the case when a plural number of the sheets are fed in a bundle from a sheet placing means and a image formation device furnished with it. SOLUTION: A pre-separation plate 32 is provided free to revolve around an axis of revolution 32a as its center, and it is constantly urged to a position to project on a carrier passage 31 by a torsion coil spring 33. It is constituted so as to separate pick-up rollers 5, 6, 7 from a sheet S by a link 35 driven by a solenoid 36 and to oscillate a pick-up roller support member 34 and to refuge from the carrier passage 31 by pushing down the pre-separation plate 32 simultaneously.
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