| 摘要 |
In an image scanning system the main scanning is carried out by deflecting a scanning light beam across a recording sheet material and the sub-scanning is carried out by moving the recording sheet material in the direction perpendicular to the main scanning direction. The system includes a sub-scanning drum adapted to be continuously rotated to feed the recording sheet material in the sub-scanning direction which is perpendicular to the rotational axis of the drum, a main scanning system for scanning a light beam across the recording sheet material in the direction of the rotational axis of the sub-scanning drum, a pair of nip rolls movable between a first position in which they are pressed against the drum and a second position in which they are removed therefrom, a stopper which is disposed downstream the drum and the nip rolls with respect to the feeding path of the sheet material and is movable into and away from the feeding path, and a sheet discharging means. The recording sheet material is fed toward the stopper which is in the feeding path and is supported thereon in the unstrained state. Then the nip rolls are pressed against the rotating drum sandwiching the recording sheet material therebetween and at the same time the stopper is retracted away from the sheet, whereby the sheet is moved in the sub-scanning direction. The sheet discharging means is arranged not to act on the sheet while the scanning is effected.
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