Medium transportation apparatus, image forming apparatus, and method of assembling medium transportation apparatus

A structure unit for forming a transportation path to guide and transport a medium to be printed from an upstream side in a medium transportation direction toward a downstream side in the medium transportation direction, comprising:

• a first region disposed outside an accommodation space on the downstream side in the medium transportation direction when the structure unit is attached to a first apparatus;
• and
• a second region disposed inside the accommodation space on the upstream side in the medium transportation direction when the structure unit is attached to the first apparatus,
• wherein said second region has a first length when the structure unit is attached to a first apparatus, and
• said second region has a second length shorter than the first length when the structure unit is attached to a second apparatus.

A method of assembling a medium transportation apparatus inside an image forming apparatus, said medium transportation apparatus including a transportation portion for transporting a medium;

• a first structure unit for forming a first transportation path to guide and transport the medium in a first direction from an upstream side in a medium transportation direction toward a downstream side in the medium transportation direction;
• and a second structure unit for forming an accommodation space to accommodate a part of the first structure unit,
• said method comprising the steps of:
• attaching the second structure unit to a main body structure portion of the image forming apparatus so that the accommodation space is formed;
• placing the first structure unit so that the first structure unit includes a first region disposed outside the accommodation space on the downstream side in the medium transportation direction and a second region disposed inside the accommodation space on the upstream side in the medium transportation direction;
• adjusting a length of the second region in the first direction to set a transportation path length of the first region;
• and
• attaching the first structure unit to the main body structure portion of the image forming apparatus.