Sheet feeding device with control of skew-correction

Details Sheet feeding device with control of skew-correction Sheet feeding device with control of skew-correction

1995-10-04

1997-10-28

Skaggs, H. Grant

Sheet feeding or delivering

Feeding

Separator and conveyor

271227, 271119, 271228, 271240, 271238, 271242, 271245, 271171, B65H 500

Patent

active

056810369

ABSTRACT:
A sheet feeding device can perform registration of a sheet with high precision even if the sheet is fed at high speed. The device includes a pair of active registration rollers, disposed at a side upstream from a reading unit in the sheet feeding direction, for correcting skew of the sheet, skew-amount detection sensors, disposed at a side downstream from the pair of active registration rollers in the sheet feeding direction, respective pairs of feeding rollers, disposed at a side upstream from the pairs of active registration rollers in the sheet feeding direction, and sheet detection sensors, disposed at a side upstream from the pairs of feeding rollers in the sheet feeding direction. Each of the pairs of feeding rollers includes a roller having a semispherical cross section at the driving side. When the leading edge of the sheet has been detected by the sheet detection sensors, the semispherical rollers are stopped in a state of not holding the sheet when the sheet is fed to the pair of active registration rollers by rotating the semispherical rollers by a predetermined number of revolutions at the same phase.

REFERENCES:
patent: 4958199 (1990-09-01), Yamashita et al.
patent: 5156391 (1992-10-01), Roller
patent: 5169140 (1992-12-01), Werthe
patent: 5172907 (1992-12-01), Kalisiak
patent: 5486910 (1996-01-01), Harada
patent: 5516093 (1996-05-01), Ballard et al.
patent: 5533721 (1996-07-01), Takashimizu

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