Position adjustment mechanism

A position adjustment mechanism configured to perform long member position adjustment, comprising:

• a case extending in a first direction;
• a moving member movable in the first direction with respect to the case;
• a lock member attached to the case so as to be movable in a second direction with respect to the case, the second direction being a direction perpendicular to the first direction;
• and
• a long member connected to the case and/or the moving member, wherein
• the moving member includes:
• a first engaging part that engages with the lock member in the first direction;
• and
• a second engaging part that engages with the lock member in the first direction by movement of the lock member in the second direction,
• the lock member includes:
• a first engaged part that engages with the first engaging part in the first direction;
• and
• a second engaged part that engages with the second engaging part in the first direction by the movement of the lock member in the second direction,
• the moving member and the case are assembled such that the moving member separates from the case by moving in a separation direction of the first direction with respect to the case,
• the lock member is provided in the case so as to be movable between a lock position and a separate position, the lock position being a position at which the second engaged part engages with the second engaging part in the second direction to regulate movement of the moving member in the first direction with respect to the case, the separate position being a position at which the second engaged part separates from the second engaging part in the second direction to allow relative movement of the moving member with respect to the case,
• when the lock member is at the separate position, the lock member regulates separation of the moving member from the case by engagement of the first engaging part with the first engaged part in the first direction,
• the moving member allows a relative position of the moving member with respect to the case to be adjusted by separation of the first engaging part from the first engaged part of the lock member and the relative movement of the moving member with respect to the case,
• the lock member comprises an abutting part which faces the moving member in the second direction such that movement of the lock member from the separate position to the lock position is regulated in a state in which the first engagement part and the first engaged part are engaged in the first direction,
• the moving member comprises a protrusion which protrudes from the moving member such that the protrusion can engage with the abutting part in the second direction when the lock member is positioned at the separate position, and
• the movement of the lock member from the separate position to the lock position is regulated by engagement of the protrusion and the abutting part of the lock member in the second direction.