| 摘要 |
A sheet feeder (9) including a sheet feed shaft (13), a partially cut-out semicircular sheet feed roller (11) coaxially provided to the sheet feed shaft (13), a cam (15) coaxially provided to the sheet feed shaft (13), a driven gear (16) having a toothless portion coaxially provided to the sheet feed shaft (13), a bottom plate (17) movable to contact or separate from the cam (15), a driving unit to move the driven gear (16) relative to the sheet feed shaft (13) in a direction of rotation of the sheet feed shaft (13), a drive gear (18) to drive the driven gear (16), a gear stopping unit to stop rotation of the driven gear (16) at a predetermined timing, a coupling unit to drive the driven gear (16) and the sheet feed shaft (13) in conjunction with each other, and a shaft stopping unit to stop rotation of the sheet feed shaft (13). |
