Patent ID: 7878322

Claim:
A structure for supporting a pulley holder comprising: a pulley holder configured to support a pulley such that the pulley is rotated by a belt stretched around the pulley; and a frame member configured to support the pulley holder such that the pulley holder slides in a first direction; wherein the pulley holder includes a first fitting portion and a second fitting portion that are arranged in the first direction, and a dimension of the first fitting portion in a second direction perpendicular to the first direction is larger than a dimension of the second fitting portion in the second direction; the frame member includes a first fitting opening and a second fitting opening that are arranged in the first direction, and a dimension of the first fitting opening in the second direction is larger than a dimension of the second fitting opening in the second direction; and the first fitting portion and the second fitting portion are fitted into the first fitting opening and the second fitting opening, respectively.