A device for tracing lines on a surface, the device comprising: · a body including a receptacle for containing paint; · a first roller that is rotary and fastened to the body, having a first tread configured to be in contact with said surface; · a second roller having a second tread, the second roller being mounted rotatably in the receptacle in such a manner that the second tread can be in contact with the paint; · a third roller having a third tread, said third roller presenting a clutched position in which the third tread comes to bear against the first and second treads (20, 32) in such a manner that moving the device causes the first roller to rotate, which in turn drives the third roller and the second roller in rotation, whereby paint is taken from the receptacle to the first tread in order to trace the line; and · fastener means (50, 52) for rotatably fastening the third roller to the body so as to hold the third roller in the clutched position; the third roller also presenting a de-clutched position in which the third roller is fastened to the body by the fastener means (50, 52) in such a manner that the third tread is held at a distance from at least one of the first and second treads, the third roller having a rotary shaft, the fastener means (50, 52) co-operating with the rotary shaft in order to provide a pivot connection, and the third roller being arranged above the first and second rollers (18, 30), the device being characterized in that the fastener means (50, 52) include at least one fastener part (50, 52) that has a first housing (50a, 52a) for receiving the rotary shaft of the third roller when the third roller is in the clutched position, and a second housing (50b, 52b) arranged above the first housing (50a, 52a) for receiving the rotary shaft when the third roller is in the de-clutched position, the position of the second housing (50b, 52b) being arranged so that the third tread is maintained at a distance from the first and/or second treads when the shaft is received in the second housing. · a body including a receptacle for containing paint; · a first roller that is rotary and fastened to the body, having a first tread configured to be in contact with said surface; · a second roller having a second tread, the second roller being mounted rotatably in the receptacle in such a manner that the second tread can be in contact with the paint; · a third roller having a third tread, said third roller presenting a clutched position in which the third tread comes to bear against the first and second treads (20, 32) in such a manner that moving the device causes the first roller to rotate, which in turn drives the third roller and the second roller in rotation, whereby paint is taken from the receptacle to the first tread in order to trace the line; and · fastener means (50, 52) for rotatably fastening the third roller to the body so as to hold the third roller in the clutched position; the third roller also presenting a de-clutched position in which the third roller is fastened to the body by the fastener means (50, 52) in such a manner that the third tread is held at a distance from at least one of the first and second treads, the third roller having a rotary shaft, the fastener means (50, 52) co-operating with the rotary shaft in order to provide a pivot connection, and the third roller being arranged above the first and second rollers (18, 30), the device being characterized in that the fastener means (50, 52) include at least one fastener part (50, 52) that has a first housing (50a, 52a) for receiving the rotary shaft of the third roller when the third roller is in the clutched position, and a second housing (50b, 52b) arranged above the first housing (50a, 52a) for receiving the rotary shaft when the third roller is in the de-clutched position, the position of the second housing (50b, 52b) being arranged so that the third tread is maintained at a distance from the first and/or second treads when the shaft is received in the second housing.