Sheet supplying unit and image forming device

Details Sheet supplying unit and image forming device Sheet supplying unit and image forming device

2009-06-26

2011-12-06

Karmis, Stefanos (Department: 3653)

Sheet feeding or delivering

Feeding

Separator and conveyor

C271S004030, C271S266000, C271S256000, C271S258010, C271S258030, C271S258020

Reexamination Certificate

active

08070152

ABSTRACT:
A sheet supplying unit that supplies sheets includes a sheet accommodation tray that accommodates the sheets in a stacked state, the sheets including a first sheet which is an uppermost sheet in the stack of the sheets and a second sheet which is immediately below the first sheet; a pick-up roller that conveys the sheets in a sheet conveying direction; a detection sensor that detects passage of the sheets and is disposed downstream of the pick-up roller in the sheet conveying direction; and a control unit that controls operations of the pick-up roller in accordance with outputs from the detection sensor. The control unit includes a driving section that drives the pick-up roller to start conveying the second sheet when the detection sensor detects a trailing edge of the first sheet, if the second sheet is to be fed; a suspending section that temporarily stops driving the pick-up roller for a time period α-β when the detection sensor detects a leading edge of the second sheet, α being a predetermined time period, and β being a time period from a timing when the detection sensor detects the trailing edge of the first sheet to a timing when the detection sensor detects the leading edge of the second sheet; and a resuming section that resumes driving the pick-up roller to convey the second sheet after suspending for the time period α-β.

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