Patent ID: 7325802

Claim:
An aligning device, comprising: feed means comprised of plural pairs of feeding elements for feeding a sheet on which an image is formed; release means for releasing a pinching force exerted to the sheet by the plural pairs of feeding elements; and alignment means for, when the pinching force is released by the release means, aligning a position of the sheet in a sheet-width direction orthogonal to a direction of sheet feeding, wherein the feed means and the release means are driven by a single drive source, wherein, the drive source is a motor, and switchover between a feed mode for feeding the sheet by the feed means and a release mode for releasing the pinching force exerted to the sheet is performed by changing a rotative direction of the motor, wherein, the feed means includes feed rollers and driven rollers which are driven by the feed rollers, the feed rollers and the driven rollers being provided for pinching the sheet, the release means includes cam means for moving the driven rollers away from the feed rollers, and power transmission means which is engaged with the cam means and hence causes the cam means to move, the cam means is connected to an end of an elastic member, the other end of the elastic member being fixed, the power transmission means is combined with the motor via a first one-way clutch, and the rotative direction of the motor is switched from a direction for the feed mode to a direction for the release mode so that the cam means causes the driven rollers to get away from the feed rollers, while the rotative direction of the motor is switched from the direction for the release mode to the direction for the feed mode so that, under action of the elastic member, the cam means causes the driven rollers to come close to the feed rollers.