Abstract: An on-vehicle interface apparatus includes a touch screen and an I/F controller. The I/F controller stores a first message and a second message having a lower urgency level in association with respective events. The I/F controller displays operation switches including operation switches regarding traveling of a vehicle irrespectively of the events on the touch screen, and, in response to occurrence of an event, displays a corresponding message on the touch screen. The I/F controller, in response to detection of a touch operation on a display region of the first message during display of the first message, outputs to the vehicle controller a signal that instructs execution of the driving control corresponding to the first message.

Abstract: A traveling direction of a sludge drawing tool can be reversed regardless of the position of the sludge drawing tool. An endless chain is wound around a pair of wheels, and has straight lines L1 and L2 extending therebetween, and a pulling portion is provided in a part thereof. A sludge drawing tool is arranged to be able to move forward between the wheels. The sludge drawing tool is provided with engagement portions having a shape enabling the pulling portion circumferentially moving along the chain to be engaged therewith and disengaged therefrom. When the driving wheel rotates in a forward direction, the engagement portion comes into contact with the pulling portion circumferentially moving along the straight line L1 in a drawing direction, to make the sludge drawing tool move in the drawing direction. During the rotation in the forward direction, the engagement portion comes into contact with the pulling portion.

Abstract: A traveling direction of a sludge drawing tool can be reversed regardless of the position of the sludge drawing tool. An endless chain is wound around a pair of wheels, and has straight lines L1 and L2 extending therebetween, and a pulling portion is provided in a part thereof. A sludge drawing tool is arranged to be able to move forward between the wheels. The sludge drawing tool is provided with engagement portions having a shape enabling the pulling portion circumferentially moving along the chain to be engaged therewith and disengaged therefrom. When the driving wheel rotates in a forward direction, the engagement portion comes into contact with the pulling portion circumferentially moving along the straight line L1 in a drawing direction, to make the sludge drawing tool move in the drawing direction. During the rotation in the forward direction, the engagement portion comes into contact with the pulling portion.