Patent ID: 8887899

Claim:
A liquid jetting apparatus configured to jet a liquid, comprising: a casing; a liquid jetting head configured to jet the liquid; a carriage on which the liquid jetting head is mounted, and which is configured to be movable in a scanning direction; a first pulley and a second pulley which are arranged in the casing, to be mutually isolated in the scanning direction such that an external common tangent of the first pulley and the second pulley is parallel to the scanning direction; a third pulley which is arranged in the casing so that an external common tangent with the first pulley and the third pulley intersects with the scanning direction; a motor which is coupled to one of the first pulley, the second pulley, and the third pulley; an endless belt which is put around the first pulley, the second pulley, and the third pulley, to make a contact with the first pulley, the second pulley, and the third pulley, and on which the carriage is installed at a portion positioned on the external common tangent of the first pulley and the second pulley; a tension pulley which makes a contact with a contact portion of the endless belt, which is positioned on a surface on an outer side of a portion of the endless belt between the second pulley and the third pulley, and which is movable in the scanning direction to adjust a tension to the endless belt by bending the portion of the endless belt between the second pulley and the third pulley; a regulating mechanism which is configured to regulate a movement of the tension pulley within a plane orthogonal to a shaft of the tension pulley such that the tension pulley is movable in the scanning direction; and a bias applying mechanism which is configured to apply bias to the tension pulley, in a direction of moving closer to the third pulley in the scanning direction.