| 主权项 |
1. An image forming apparatus comprising:
a main body including an image forming unit configured to form an image on a sheet; a re-feeding mechanism configured to re-feed the sheet having a first image on a first surface thereof to the image forming unit for forming a second image on a second surface of the sheet at the image forming unit, the re-feeding mechanism including:
a fixed guide positioned in a lower portion of the main body and configured to guide the sheet fed in a sheet feed direction toward the image forming unit, the fixed guide having a guide surface partially defining a re-feeding path through which the sheet passes;a base guide disposed downstream of the fixed guide in the sheet feed direction; anda movable guide having a guide surface facing the base guide and partially defining the re-feeding path, the movable guide being configured to guide the sheet guided by the fixed guide and to move toward and away from the base guide; and a sheet supply tray configured to be attached to and removed from the lower portion of the main body and to contain a stack of sheets to be supplied to the image forming unit, the sheet supply tray being disposed above the fixed guide when attached to the lower portion of the main body, a downstream portion of the sheet supply tray in the sheet feed direction including the base guide, the movable guide, and an urging member, the base guide and the movable guide partially defining the re-feeding path below the sheet supply tray, wherein the fixed guide, partially disposed below the sheet supply tray attached to the lower portion of the main body, includes a first engaging portion disposed in a first end portion of the fixed guide in a horizontal direction perpendicular to the sheet feed direction and a second engaging portion disposed in a second end portion of the fixed guide opposite to the first end portion in the horizontal direction perpendicular to the sheet feed direction, wherein the movable guide facing a lower surface of the sheet supply tray includes a third engaging portion disposed in a third end portion of the movable guide in the horizontal direction perpendicular to the sheet feed direction and a fourth engaging portion disposed in a fourth end portion of the movable guide opposite to the third end portion in the horizontal direction perpendicular to the sheet feed direction, wherein the guide surface of the movable guide is positioned relative to the guide surface of the fixed guide when the third engaging portion and the fourth engaging portion of the movable guide engage the first engaging portion and the second engaging portion of the fixed guide, respectively, and wherein the movable guide includes an upstream end portion and a downstream end portion in the sheet feed direction, the upstream end portion being connected to the urging member and including the third engaging portion and the fourth engaging portion, the downstream end portion having an axis about which the movable guide is configured to pivot. |
