Sheet conveying device and image forming apparatus having the same

摘要

A sheet conveying device includes a first tray, a conveying portion, a second tray, and a conveyance control portion. The conveying portion has: a first conveying path that extends from the first tray; a second conveying path that makes the first conveying path and the second tray communicate with each other and is provided with an ejecting roller pair; a third conveying path that makes the second conveying path and an ejecting space communicate with each other and is provided with a reverse roller pair. After a first sheet passes through the reference position, the conveyance control portion stops rotation of the ejecting roller pair with the first sheet conveyed in the second conveying path nipped by the sheet ejecting roller pair, and after a second sheet passes through the reference position, the conveyance control portion rotates the reverse roller pair with the rotation of the ejecting roller pair stopped.

主权项

1. A sheet conveying device comprising:
a first tray in which a sheet is loaded; a conveying portion that conveys the sheet placed in the first tray in such a way that the sheet passes through a predetermined reference position; a second tray which is disposed under the first tray via an ejecting space and in which the sheet conveyed by the conveying portion is ejected; a conveyance control portion that controls the conveying portion, the conveying portion includes: a first conveying path that is formed to extend from the first tray to the reference position; a second conveying path that is formed to extend from the reference position to the second tray; a third conveying path that is separated from the second conveying path and communicates with the ejecting space above the second tray; a fourth conveying path that is separated from the third conveying path and communicates with the first conveying path; an ejecting roller pair that is disposed in the second conveying path and rotates in a first rotation direction to eject the sheet to the second tray; a reverse roller pair that is disposed in the third conveying path and rotates in the first rotation direction to make one end of the sheet protrude into the ejecting space, thereafter, rotates in a second rotation direction opposite to the first direction to convey the sheet in a switchback manner, and reconvey the sheet from the fourth conveying path into the first conveying path; and a driving portion that generates a rotating force to rotate the ejecting roller pair and the reverse roller pair; wherein the conveyance control portion is able to execute duplex conveyance control in which the sheet passing through the reference position with a first surface opposing the reference position is reversed, the sheet is conveyed in such a way that the sheet passes through the reference position with a second surface opposing the reference position opposite to the first surface, thereafter, the sheet is ejected to the second tray; and in a case where the conveyance control portion continuously applies the duplex conveyance control to a plurality of the sheets, after a first sheet passes through the reference position with the second surface opposing the reference position, the conveyance control portion stops the rotation of the ejecting roller pair with a rear end side of the first sheet conveyed in the second conveying path nipped by the ejecting roller pair, and after a second sheet following the first sheet passes through the reference position with the first surface opposing the reference position, the conveyance control portion rotates the reverse roller pair in the first rotation direction with the rotation of the ejecting roller pair stopped, thereby making one end of the second sheet protrude from the third conveying path into the sheet ejecting space.