Conveyance apparatus and image forming apparatus

An image forming apparatus configured to form an image on a sheet, the image forming apparatus comprising:

• a conveyance apparatus configured to convey a sheet, the conveyance apparatus comprising:
• a first conveyance roller pair configured to convey the sheet, the first conveyance roller pair including a first roller and a first opposing roller opposing the first roller;
• a second conveyance roller pair configured to convey the sheet toward the first conveyance roller pair, the second conveyance roller pair including a second roller and a second opposing roller opposing the second roller, the second conveyance roller pair configured to convey the sheet towards the first conveyance roller pair;
• a moving member configured to move between a restricting position at which the moving member is configured to restrict the sheet from reaching the first conveyance roller pair, and a retracting position retracted from the restricting position;
• a first guide configured to guide the sheet conveyed by the second conveyance roller pair, the first guide being disposed between the moving member and the second conveyance roller pair;
• and
• a first opposing guide configured to guide the sheet conveyed by the second conveyance roller pair, the first opposing guide being disposed between the moving member and the second conveyance roller pair to oppose the first guide;
• a sheet stacking unit on which the sheet is stacked;
• an image forming unit configured to form an image on the sheet conveyed from the sheet stacking unit;
• a first conveyance path through which the sheet conveyed from the sheet stacking unit toward the image forming unit passes;
• and
• a second conveyance path through which the sheet conveyed toward the image forming unit again after the image is formed by the image forming unit passes, the second conveyance path being connected to the first conveyance path at a junction,
• wherein the second conveyance roller pair is configured to convey the sheet such that (i) the sheet moves the moving member from the restricting position to the retracting position after the sheet contacts the moving member positioned at the restricting portion and skew of the sheet is corrected and (ii) the sheet reaches a position at which the sheet contacts the first conveyance roller pair,
• wherein one of the first guide and the first opposing guide includes a first curved portion which the sheet contacts, and the other of the first guide and the first opposing guide includes a second curved portion which the sheet contacts, and
• wherein the second conveyance roller pair is configured to convey the sheet such that (i) the sheet contacts the second curved portion after contacting the first curved portion, and then the sheet reaches the moving member and (ii) the sheet is delivered to the first conveyance roller pair in a curved state in which the sheet is curved by the first curved portion and the second curved portion,
• wherein the first conveyance roller pair is disposed between the junction and the image forming unit, and conveys the sheet toward the image forming unit, and
• wherein the second conveyance roller pair, the first guide, and the first opposing guide are disposed on the second conveyance path.

A conveyance apparatus configured to convey a sheet, the conveyance apparatus comprising:

• a first conveyance roller pair configured to convey the sheet, the first conveyance roller pair including a first roller and a first opposing roller opposing the first roller;
• a second conveyance roller pair configured to convey the sheet toward the first conveyance roller pair, the second conveyance roller pair including a second roller and a second opposing roller opposing the second roller, the second conveyance roller pair configured to convey the sheet towards the first conveyance roller pair;
• a moving member configured to move between a restricting position at which the moving member is configured to restrict the sheet from reaching the first conveyance roller pair, and a retracting position retracted from the restricting position;
• a first guide configured to guide the sheet conveyed by the second conveyance roller pair, the first guide being disposed between the moving member and the second conveyance roller pair;
• and
• a first opposing guide configured to guide the sheet conveyed by the second conveyance roller pair, the first opposing guide being disposed between the moving member and the second conveyance roller pair to oppose the first guide;
• and
• wherein the second conveyance roller pair is configured to convey the sheet such that (i) the sheet moves the moving member from the restricting position to the retracting position after the sheet contacts the moving member positioned at the restricting portion and skew of the sheet is corrected and (ii) the sheet reaches a position at which the sheet contacts the first conveyance roller pair,
• wherein one of the first guide and the first opposing guide includes a first curved portion which the sheet contacts, and the other of the first guide and the first opposing guide includes a second curved portion which the sheet contacts, and
• wherein the second conveyance roller pair is configured to convey the sheet such that (i) the sheet contacts the second curved portion after contacting the first curved portion, and then the sheet reaches the moving member and (ii) the sheet is delivered to the first conveyance roller pair in a curved state in which the sheet is curved by the first curved portion and the second curved portion,
• wherein the one of the first guide and the first opposing guide includes a third curved portion which the sheet contacts, and
• wherein the second conveyance roller pair is configured to convey the sheet such that the sheet contacts the third curved portion after the sheet contacts the second curved portion.