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1. A liquid jetting apparatus which jets liquid, comprising:
a liquid jetting head configured to have a liquid jetting surface on which a plurality of nozzles, from which the liquid is jetted, are open; a wiper having a through hole formed therein, and configured to move, relative to and along the liquid jetting surface, while being brought in contact with the liquid jetting surface and to wipe the liquid adhered on the liquid jetting surface; a wiper movement mechanism configured to move the wiper in a first direction, which is orthogonal to the liquid jetting surface and approaches to the liquid jetting surface, and a second direction which is an opposite direction of the first direction; and to make the wiper approach to or separate from the liquid jetting surface; wherein the wiper movement mechanism includes:
a cam configured to have a cam surface;an axis configured to extend along the liquid jetting surface;an arm member configured to make the wiper approach to the liquid jetting surface by pushing and moving the wiper in accordance with movement of the cam; andan engaging member configured to engage the wiper at a wiping position at which the wiper makes contact with the liquid jetting surface, wherein the arm member includes:
a contact portion configured to make contact with the cam surface and to move in the first direction and the second direction;a support portion configured to be supported by the axis at a first position which is different from the contact portion;an action portion configured to make contact with the wiper and to make the wiper approach to the liquid jetting surface by pushing and moving the wiper in a state of being brought in contact with the action portion in accordance with movement of the contact portion, the action portion disposed at a second position which is different from the first position; andan engagement release portion configured to make contact with the wiper and to release engagement of the wiper by the engaging member by pushing and moving the wiper in a state of making contact with the arm member in accordance with the movement of the contact portion, wherein the engagement release portion of the arm member penetrates into the through hole and is swingable around the axis in the through hole, and wherein the engagement release portion swings in the through hole of the wiper, makes contact with an inner wall surface forming the through hole, and pushes and moves the inner wall surface, in a case that the wiper is separated from the liquid jetting surface.
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