Drive transmission device for transmitting rotary drive

A drive transmission device comprising:

• a driving shaft;
• a shaft supporting member including:
• a first bearing portion configured to support the driving shaft;
• a second bearing portion configured to support the driving shaft;
• a connecting portion configured to connect the first bearing portion and the second bearing portion;
• and
• a positioning portion which is disposed on a straight line that is the same as an axis of the driving shaft,
• wherein the first bearing portion, the second bearing portion, the connecting portion, and the positioning portion are formed as one piece and are not separate from each other,
• a first gear configured to rotate about the driving shaft, the first gear being disposed between the first bearing portion and the second bearing portion;
• a screw;
• and
• a frame to which the shaft supporting member is attached, the frame having:
• a positioning hole, wherein the positioning portion is fitted into the positioning hole to position the shaft supporting member with respect to the frame;
• a screw hole to attach the shaft supporting member to the frame using the screw, wherein the screw is inserted into the screw hole in a direction parallel with an axial direction of the driving shaft;
• a second gear configured to rotate about a shaft fixed to the frame, the first gear and the second gear being meshed with each other and configured to transmit a driving force from a motor,
• wherein a center of the positioning portion is disposed on the straight line that is the same as the axis of the driving shaft, and in a state where the shaft supporting member is attached to the frame, the driving shaft and the shaft fixed to the frame are in parallel.