| 摘要 |
A sheet treating apparatus includes a stacking tray, a delivery rotary member, an endless belt member, and a traction device. The stacking tray has a stacking surface for receiving and stacking sheets thereon and a stopper portion for regulating the end portions of the sheets. The delivery rotary member delivers the sheets to the stacking tray. The endless belt member contacts with and acts on the upper surface of the sheets on the stacking tray, and feeds the delivered sheet so as to pull the end portion thereof into the stopper portion. The traction device pulls a portion of the endless belt member in a predetermined direction. During sheet feeding caused by the endless belt member, the traction device is operated in conformity with the height of the sheets stacked on the stacking tray to thereby control the contact pressure of the endless belt member against the sheets stacked on the stacking tray so as to become substantially constant. The stacking tray is inclined so that the downstream side thereof in the delivery direction of the sheet may become higher. The delivered sheet is switched back to return with the direction thereof changed over, and the stopper portion is provided on the downstream side in the direction of return of the sheet. The endless belt member is supported with a portion of its inner peripheral surface twined around the delivery rotary member and is rotated with the delivery rotary member.
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