Sheet conveying apparatus, drive transmission apparatus and image forming apparatus

A sheet conveying apparatus, comprising:

• a conveying member rotating and conveying a sheet;
• a moving member configured to be movable between a first guiding position and a second guiding position, the moving member guiding the sheet to a first conveyance path in the first guiding position and guiding the sheet to a second conveyance path in the second guiding position;
• and
• a planetary gear mechanism, said planetary gear mechanism including:
• a first rotating element configured to rotate in a first direction and a second direction which is opposite to the first direction,
• a second rotating element configured to engage with the first rotating element and rotate the conveying member by drivenly rotating with the first rotating element, and
• a third rotating element configured to engage with the first rotating element, the third rotating element configured to move the moving member from the second guiding position to the first guiding position by drivenly rotating with the first rotating element rotating in the first direction, and move the moving member from the first guiding position to the second guiding position by drivenly rotating with the first rotating element rotating in the second direction.

A drive transmission apparatus, comprising:

• a rotating member configured to be rotatable;
• a moving member configured to be movable between a first position and a second position;
• and
• a planetary gear mechanism, said planetary gear mechanism including:
• a first rotating element configured to rotate in a first direction and a second direction which is opposite to the first direction;
• a second rotating element configured to engage with the first rotating element and rotate the rotating member by drivenly rotating with the first rotating element;
• and
• a third rotating element configured to engage with the first rotating element, the third rotating element configured to move the moving member from the second position to the first position by drivenly rotating with the first rotating element rotating in the first direction, and move the moving member from the first position to the second position by drivenly rotating with the first rotating element rotating in the second direction.

A sheet conveying apparatus comprising:

• a conveying member configured to convey a sheet while rotating, the conveying member configured to rotate in a first rotating direction and in a second rotating direction;
• a guide member configured to be movable between a first guiding position and a second guiding position, and configured to guide the sheet, the guide member guiding the sheet to a first conveying pass in the first guiding position, and guiding the sheet to a second conveying pass in the second guiding position;
• a motor configured to rotate in a forward rotating direction and a reverse rotating direction;
• and
• a gear mechanism through which a driving force from the motor is transmitted to the conveying member and the guide member,
• wherein the gear mechanism is configured such that a rotating direction of the conveying member is switched from the second rotating direction to the first rotating direction, and the guide member is moved from the second guiding position to the first guiding position in a case where a rotating direction of the motor is switched from the reverse rotating direction to the forward rotating direction.