Patent ID: 8613445

Claim:
A drive transmission device, comprising: a gear train that transmits rotational drive input from a drive source to a drive target, the gear train including a first gear train that forms a first transmission path for transmitting the rotational drive to the drive target, a second gear train that forms a second transmission path for transmitting the rotational drive to the drive target as rotational drive opposite in rotation direction to the rotational drive transmitted by the first gear train, and a movable gear movable between a first drive transmission position at which the movable gear forms a part of the first gear train and causes the first gear train to transmit the rotational drive to the drive target and a second drive transmission position at which the movable gear forms a part of the second gear train and causes the second gear train to transmit the rotational drive to the drive target; a movable gear locking device that locks the movable gear at an idle position, which is located at a position different from the first drive transmission position and the second drive transmission position, between the first drive transmission position and the second drive transmission position; a movable gear supporting member that rotatably supports the movable gear; and a movable gear moving mechanism that, when in an OFF state, places the movable gear at the first drive transmission position, and that, when in an ON state, moves the movable gear supporting member and thereby place the movable gear at the second drive transmission position, wherein the movable gear locking device includes: a hitting member that strikes a contact portion of the movable gear supporting member, to thereby cause the movable gear moving from the first drive transmission position toward the second drive transmission position to stop at the idle position, and a hitting member moving mechanism that, when in one of an ON state and an OFF state, places the hitting member at a hitting position at which the hitting member strikes the contact portion, and that, when in the other one of the ON state and the OFF state, places the hitting member at a retreat position at which the hitting member does not strike the contact portion.